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- // SPDX-License-Identifier: GPL-2.0-or-later
- //
- // core.c -- Voltage/Current Regulator framework.
- //
- // Copyright 2007, 2008 Wolfson Microelectronics PLC.
- // Copyright 2008 SlimLogic Ltd.
- //
- // Author: Liam Girdwood <lrg@slimlogic.co.uk>
- #include <linux/kernel.h>
- #include <linux/init.h>
- #include <linux/debugfs.h>
- #include <linux/device.h>
- #include <linux/slab.h>
- #include <linux/async.h>
- #include <linux/err.h>
- #include <linux/mutex.h>
- #include <linux/suspend.h>
- #include <linux/delay.h>
- #include <linux/gpio/consumer.h>
- #include <linux/of.h>
- #include <linux/regmap.h>
- #include <linux/regulator/of_regulator.h>
- #include <linux/regulator/consumer.h>
- #include <linux/regulator/coupler.h>
- #include <linux/regulator/driver.h>
- #include <linux/regulator/machine.h>
- #include <linux/module.h>
- #define CREATE_TRACE_POINTS
- #include <trace/events/regulator.h>
- #include "dummy.h"
- #include "internal.h"
- #define rdev_crit(rdev, fmt, ...) \
- pr_crit("%s: " fmt, rdev_get_name(rdev), ##__VA_ARGS__)
- #define rdev_err(rdev, fmt, ...) \
- pr_err("%s: " fmt, rdev_get_name(rdev), ##__VA_ARGS__)
- #define rdev_warn(rdev, fmt, ...) \
- pr_warn("%s: " fmt, rdev_get_name(rdev), ##__VA_ARGS__)
- #define rdev_info(rdev, fmt, ...) \
- pr_info("%s: " fmt, rdev_get_name(rdev), ##__VA_ARGS__)
- #define rdev_dbg(rdev, fmt, ...) \
- pr_debug("%s: " fmt, rdev_get_name(rdev), ##__VA_ARGS__)
- static DEFINE_WW_CLASS(regulator_ww_class);
- static DEFINE_MUTEX(regulator_nesting_mutex);
- static DEFINE_MUTEX(regulator_list_mutex);
- static LIST_HEAD(regulator_map_list);
- static LIST_HEAD(regulator_ena_gpio_list);
- static LIST_HEAD(regulator_supply_alias_list);
- static LIST_HEAD(regulator_coupler_list);
- static bool has_full_constraints;
- static struct dentry *debugfs_root;
- /*
- * struct regulator_map
- *
- * Used to provide symbolic supply names to devices.
- */
- struct regulator_map {
- struct list_head list;
- const char *dev_name; /* The dev_name() for the consumer */
- const char *supply;
- struct regulator_dev *regulator;
- };
- /*
- * struct regulator_enable_gpio
- *
- * Management for shared enable GPIO pin
- */
- struct regulator_enable_gpio {
- struct list_head list;
- struct gpio_desc *gpiod;
- u32 enable_count; /* a number of enabled shared GPIO */
- u32 request_count; /* a number of requested shared GPIO */
- };
- /*
- * struct regulator_supply_alias
- *
- * Used to map lookups for a supply onto an alternative device.
- */
- struct regulator_supply_alias {
- struct list_head list;
- struct device *src_dev;
- const char *src_supply;
- struct device *alias_dev;
- const char *alias_supply;
- };
- static int _regulator_is_enabled(struct regulator_dev *rdev);
- static int _regulator_disable(struct regulator *regulator);
- static int _regulator_get_current_limit(struct regulator_dev *rdev);
- static unsigned int _regulator_get_mode(struct regulator_dev *rdev);
- static int _notifier_call_chain(struct regulator_dev *rdev,
- unsigned long event, void *data);
- static int _regulator_do_set_voltage(struct regulator_dev *rdev,
- int min_uV, int max_uV);
- static int regulator_balance_voltage(struct regulator_dev *rdev,
- suspend_state_t state);
- static struct regulator *create_regulator(struct regulator_dev *rdev,
- struct device *dev,
- const char *supply_name);
- static void destroy_regulator(struct regulator *regulator);
- static void _regulator_put(struct regulator *regulator);
- const char *rdev_get_name(struct regulator_dev *rdev)
- {
- if (rdev->constraints && rdev->constraints->name)
- return rdev->constraints->name;
- else if (rdev->desc->name)
- return rdev->desc->name;
- else
- return "";
- }
- static bool have_full_constraints(void)
- {
- return has_full_constraints || of_have_populated_dt();
- }
- static bool regulator_ops_is_valid(struct regulator_dev *rdev, int ops)
- {
- if (!rdev->constraints) {
- rdev_err(rdev, "no constraints\n");
- return false;
- }
- if (rdev->constraints->valid_ops_mask & ops)
- return true;
- return false;
- }
- /**
- * regulator_lock_nested - lock a single regulator
- * @rdev: regulator source
- * @ww_ctx: w/w mutex acquire context
- *
- * This function can be called many times by one task on
- * a single regulator and its mutex will be locked only
- * once. If a task, which is calling this function is other
- * than the one, which initially locked the mutex, it will
- * wait on mutex.
- */
- static inline int regulator_lock_nested(struct regulator_dev *rdev,
- struct ww_acquire_ctx *ww_ctx)
- {
- bool lock = false;
- int ret = 0;
- mutex_lock(®ulator_nesting_mutex);
- if (ww_ctx || !ww_mutex_trylock(&rdev->mutex)) {
- if (rdev->mutex_owner == current)
- rdev->ref_cnt++;
- else
- lock = true;
- if (lock) {
- mutex_unlock(®ulator_nesting_mutex);
- ret = ww_mutex_lock(&rdev->mutex, ww_ctx);
- mutex_lock(®ulator_nesting_mutex);
- }
- } else {
- lock = true;
- }
- if (lock && ret != -EDEADLK) {
- rdev->ref_cnt++;
- rdev->mutex_owner = current;
- }
- mutex_unlock(®ulator_nesting_mutex);
- return ret;
- }
- /**
- * regulator_lock - lock a single regulator
- * @rdev: regulator source
- *
- * This function can be called many times by one task on
- * a single regulator and its mutex will be locked only
- * once. If a task, which is calling this function is other
- * than the one, which initially locked the mutex, it will
- * wait on mutex.
- */
- static void regulator_lock(struct regulator_dev *rdev)
- {
- regulator_lock_nested(rdev, NULL);
- }
- /**
- * regulator_unlock - unlock a single regulator
- * @rdev: regulator_source
- *
- * This function unlocks the mutex when the
- * reference counter reaches 0.
- */
- static void regulator_unlock(struct regulator_dev *rdev)
- {
- mutex_lock(®ulator_nesting_mutex);
- if (--rdev->ref_cnt == 0) {
- rdev->mutex_owner = NULL;
- ww_mutex_unlock(&rdev->mutex);
- }
- WARN_ON_ONCE(rdev->ref_cnt < 0);
- mutex_unlock(®ulator_nesting_mutex);
- }
- static bool regulator_supply_is_couple(struct regulator_dev *rdev)
- {
- struct regulator_dev *c_rdev;
- int i;
- for (i = 1; i < rdev->coupling_desc.n_coupled; i++) {
- c_rdev = rdev->coupling_desc.coupled_rdevs[i];
- if (rdev->supply->rdev == c_rdev)
- return true;
- }
- return false;
- }
- static void regulator_unlock_recursive(struct regulator_dev *rdev,
- unsigned int n_coupled)
- {
- struct regulator_dev *c_rdev, *supply_rdev;
- int i, supply_n_coupled;
- for (i = n_coupled; i > 0; i--) {
- c_rdev = rdev->coupling_desc.coupled_rdevs[i - 1];
- if (!c_rdev)
- continue;
- if (c_rdev->supply && !regulator_supply_is_couple(c_rdev)) {
- supply_rdev = c_rdev->supply->rdev;
- supply_n_coupled = supply_rdev->coupling_desc.n_coupled;
- regulator_unlock_recursive(supply_rdev,
- supply_n_coupled);
- }
- regulator_unlock(c_rdev);
- }
- }
- static int regulator_lock_recursive(struct regulator_dev *rdev,
- struct regulator_dev **new_contended_rdev,
- struct regulator_dev **old_contended_rdev,
- struct ww_acquire_ctx *ww_ctx)
- {
- struct regulator_dev *c_rdev;
- int i, err;
- for (i = 0; i < rdev->coupling_desc.n_coupled; i++) {
- c_rdev = rdev->coupling_desc.coupled_rdevs[i];
- if (!c_rdev)
- continue;
- if (c_rdev != *old_contended_rdev) {
- err = regulator_lock_nested(c_rdev, ww_ctx);
- if (err) {
- if (err == -EDEADLK) {
- *new_contended_rdev = c_rdev;
- goto err_unlock;
- }
- /* shouldn't happen */
- WARN_ON_ONCE(err != -EALREADY);
- }
- } else {
- *old_contended_rdev = NULL;
- }
- if (c_rdev->supply && !regulator_supply_is_couple(c_rdev)) {
- err = regulator_lock_recursive(c_rdev->supply->rdev,
- new_contended_rdev,
- old_contended_rdev,
- ww_ctx);
- if (err) {
- regulator_unlock(c_rdev);
- goto err_unlock;
- }
- }
- }
- return 0;
- err_unlock:
- regulator_unlock_recursive(rdev, i);
- return err;
- }
- /**
- * regulator_unlock_dependent - unlock regulator's suppliers and coupled
- * regulators
- * @rdev: regulator source
- * @ww_ctx: w/w mutex acquire context
- *
- * Unlock all regulators related with rdev by coupling or supplying.
- */
- static void regulator_unlock_dependent(struct regulator_dev *rdev,
- struct ww_acquire_ctx *ww_ctx)
- {
- regulator_unlock_recursive(rdev, rdev->coupling_desc.n_coupled);
- ww_acquire_fini(ww_ctx);
- }
- /**
- * regulator_lock_dependent - lock regulator's suppliers and coupled regulators
- * @rdev: regulator source
- * @ww_ctx: w/w mutex acquire context
- *
- * This function as a wrapper on regulator_lock_recursive(), which locks
- * all regulators related with rdev by coupling or supplying.
- */
- static void regulator_lock_dependent(struct regulator_dev *rdev,
- struct ww_acquire_ctx *ww_ctx)
- {
- struct regulator_dev *new_contended_rdev = NULL;
- struct regulator_dev *old_contended_rdev = NULL;
- int err;
- mutex_lock(®ulator_list_mutex);
- ww_acquire_init(ww_ctx, ®ulator_ww_class);
- do {
- if (new_contended_rdev) {
- ww_mutex_lock_slow(&new_contended_rdev->mutex, ww_ctx);
- old_contended_rdev = new_contended_rdev;
- old_contended_rdev->ref_cnt++;
- }
- err = regulator_lock_recursive(rdev,
- &new_contended_rdev,
- &old_contended_rdev,
- ww_ctx);
- if (old_contended_rdev)
- regulator_unlock(old_contended_rdev);
- } while (err == -EDEADLK);
- ww_acquire_done(ww_ctx);
- mutex_unlock(®ulator_list_mutex);
- }
- /**
- * of_get_child_regulator - get a child regulator device node
- * based on supply name
- * @parent: Parent device node
- * @prop_name: Combination regulator supply name and "-supply"
- *
- * Traverse all child nodes.
- * Extract the child regulator device node corresponding to the supply name.
- * returns the device node corresponding to the regulator if found, else
- * returns NULL.
- */
- static struct device_node *of_get_child_regulator(struct device_node *parent,
- const char *prop_name)
- {
- struct device_node *regnode = NULL;
- struct device_node *child = NULL;
- for_each_child_of_node(parent, child) {
- regnode = of_parse_phandle(child, prop_name, 0);
- if (!regnode) {
- regnode = of_get_child_regulator(child, prop_name);
- if (regnode)
- goto err_node_put;
- } else {
- goto err_node_put;
- }
- }
- return NULL;
- err_node_put:
- of_node_put(child);
- return regnode;
- }
- /**
- * of_get_regulator - get a regulator device node based on supply name
- * @dev: Device pointer for the consumer (of regulator) device
- * @supply: regulator supply name
- *
- * Extract the regulator device node corresponding to the supply name.
- * returns the device node corresponding to the regulator if found, else
- * returns NULL.
- */
- static struct device_node *of_get_regulator(struct device *dev, const char *supply)
- {
- struct device_node *regnode = NULL;
- char prop_name[64]; /* 64 is max size of property name */
- dev_dbg(dev, "Looking up %s-supply from device tree\n", supply);
- snprintf(prop_name, 64, "%s-supply", supply);
- regnode = of_parse_phandle(dev->of_node, prop_name, 0);
- if (!regnode) {
- regnode = of_get_child_regulator(dev->of_node, prop_name);
- if (regnode)
- return regnode;
- dev_dbg(dev, "Looking up %s property in node %pOF failed\n",
- prop_name, dev->of_node);
- return NULL;
- }
- return regnode;
- }
- /* Platform voltage constraint check */
- int regulator_check_voltage(struct regulator_dev *rdev,
- int *min_uV, int *max_uV)
- {
- BUG_ON(*min_uV > *max_uV);
- if (!regulator_ops_is_valid(rdev, REGULATOR_CHANGE_VOLTAGE)) {
- rdev_err(rdev, "voltage operation not allowed\n");
- return -EPERM;
- }
- if (*max_uV > rdev->constraints->max_uV)
- *max_uV = rdev->constraints->max_uV;
- if (*min_uV < rdev->constraints->min_uV)
- *min_uV = rdev->constraints->min_uV;
- if (*min_uV > *max_uV) {
- rdev_err(rdev, "unsupportable voltage range: %d-%duV\n",
- *min_uV, *max_uV);
- return -EINVAL;
- }
- return 0;
- }
- /* return 0 if the state is valid */
- static int regulator_check_states(suspend_state_t state)
- {
- return (state > PM_SUSPEND_MAX || state == PM_SUSPEND_TO_IDLE);
- }
- /* Make sure we select a voltage that suits the needs of all
- * regulator consumers
- */
- int regulator_check_consumers(struct regulator_dev *rdev,
- int *min_uV, int *max_uV,
- suspend_state_t state)
- {
- struct regulator *regulator;
- struct regulator_voltage *voltage;
- list_for_each_entry(regulator, &rdev->consumer_list, list) {
- voltage = ®ulator->voltage[state];
- /*
- * Assume consumers that didn't say anything are OK
- * with anything in the constraint range.
- */
- if (!voltage->min_uV && !voltage->max_uV)
- continue;
- if (*max_uV > voltage->max_uV)
- *max_uV = voltage->max_uV;
- if (*min_uV < voltage->min_uV)
- *min_uV = voltage->min_uV;
- }
- if (*min_uV > *max_uV) {
- rdev_err(rdev, "Restricting voltage, %u-%uuV\n",
- *min_uV, *max_uV);
- return -EINVAL;
- }
- return 0;
- }
- /* current constraint check */
- static int regulator_check_current_limit(struct regulator_dev *rdev,
- int *min_uA, int *max_uA)
- {
- BUG_ON(*min_uA > *max_uA);
- if (!regulator_ops_is_valid(rdev, REGULATOR_CHANGE_CURRENT)) {
- rdev_err(rdev, "current operation not allowed\n");
- return -EPERM;
- }
- if (*max_uA > rdev->constraints->max_uA)
- *max_uA = rdev->constraints->max_uA;
- if (*min_uA < rdev->constraints->min_uA)
- *min_uA = rdev->constraints->min_uA;
- if (*min_uA > *max_uA) {
- rdev_err(rdev, "unsupportable current range: %d-%duA\n",
- *min_uA, *max_uA);
- return -EINVAL;
- }
- return 0;
- }
- /* operating mode constraint check */
- static int regulator_mode_constrain(struct regulator_dev *rdev,
- unsigned int *mode)
- {
- switch (*mode) {
- case REGULATOR_MODE_FAST:
- case REGULATOR_MODE_NORMAL:
- case REGULATOR_MODE_IDLE:
- case REGULATOR_MODE_STANDBY:
- break;
- default:
- rdev_err(rdev, "invalid mode %x specified\n", *mode);
- return -EINVAL;
- }
- if (!regulator_ops_is_valid(rdev, REGULATOR_CHANGE_MODE)) {
- rdev_err(rdev, "mode operation not allowed\n");
- return -EPERM;
- }
- /* The modes are bitmasks, the most power hungry modes having
- * the lowest values. If the requested mode isn't supported
- * try higher modes. */
- while (*mode) {
- if (rdev->constraints->valid_modes_mask & *mode)
- return 0;
- *mode /= 2;
- }
- return -EINVAL;
- }
- static inline struct regulator_state *
- regulator_get_suspend_state(struct regulator_dev *rdev, suspend_state_t state)
- {
- if (rdev->constraints == NULL)
- return NULL;
- switch (state) {
- case PM_SUSPEND_STANDBY:
- return &rdev->constraints->state_standby;
- case PM_SUSPEND_MEM:
- return &rdev->constraints->state_mem;
- case PM_SUSPEND_MAX:
- return &rdev->constraints->state_disk;
- default:
- return NULL;
- }
- }
- static const struct regulator_state *
- regulator_get_suspend_state_check(struct regulator_dev *rdev, suspend_state_t state)
- {
- const struct regulator_state *rstate;
- rstate = regulator_get_suspend_state(rdev, state);
- if (rstate == NULL)
- return NULL;
- /* If we have no suspend mode configuration don't set anything;
- * only warn if the driver implements set_suspend_voltage or
- * set_suspend_mode callback.
- */
- if (rstate->enabled != ENABLE_IN_SUSPEND &&
- rstate->enabled != DISABLE_IN_SUSPEND) {
- if (rdev->desc->ops->set_suspend_voltage ||
- rdev->desc->ops->set_suspend_mode)
- rdev_warn(rdev, "No configuration\n");
- return NULL;
- }
- return rstate;
- }
- static ssize_t regulator_uV_show(struct device *dev,
- struct device_attribute *attr, char *buf)
- {
- struct regulator_dev *rdev = dev_get_drvdata(dev);
- int uV;
- regulator_lock(rdev);
- uV = regulator_get_voltage_rdev(rdev);
- regulator_unlock(rdev);
- if (uV < 0)
- return uV;
- return sprintf(buf, "%d\n", uV);
- }
- static DEVICE_ATTR(microvolts, 0444, regulator_uV_show, NULL);
- static ssize_t regulator_uA_show(struct device *dev,
- struct device_attribute *attr, char *buf)
- {
- struct regulator_dev *rdev = dev_get_drvdata(dev);
- return sprintf(buf, "%d\n", _regulator_get_current_limit(rdev));
- }
- static DEVICE_ATTR(microamps, 0444, regulator_uA_show, NULL);
- static ssize_t name_show(struct device *dev, struct device_attribute *attr,
- char *buf)
- {
- struct regulator_dev *rdev = dev_get_drvdata(dev);
- return sprintf(buf, "%s\n", rdev_get_name(rdev));
- }
- static DEVICE_ATTR_RO(name);
- static const char *regulator_opmode_to_str(int mode)
- {
- switch (mode) {
- case REGULATOR_MODE_FAST:
- return "fast";
- case REGULATOR_MODE_NORMAL:
- return "normal";
- case REGULATOR_MODE_IDLE:
- return "idle";
- case REGULATOR_MODE_STANDBY:
- return "standby";
- }
- return "unknown";
- }
- static ssize_t regulator_print_opmode(char *buf, int mode)
- {
- return sprintf(buf, "%s\n", regulator_opmode_to_str(mode));
- }
- static ssize_t regulator_opmode_show(struct device *dev,
- struct device_attribute *attr, char *buf)
- {
- struct regulator_dev *rdev = dev_get_drvdata(dev);
- return regulator_print_opmode(buf, _regulator_get_mode(rdev));
- }
- static DEVICE_ATTR(opmode, 0444, regulator_opmode_show, NULL);
- static ssize_t regulator_print_state(char *buf, int state)
- {
- if (state > 0)
- return sprintf(buf, "enabled\n");
- else if (state == 0)
- return sprintf(buf, "disabled\n");
- else
- return sprintf(buf, "unknown\n");
- }
- static ssize_t regulator_state_show(struct device *dev,
- struct device_attribute *attr, char *buf)
- {
- struct regulator_dev *rdev = dev_get_drvdata(dev);
- ssize_t ret;
- regulator_lock(rdev);
- ret = regulator_print_state(buf, _regulator_is_enabled(rdev));
- regulator_unlock(rdev);
- return ret;
- }
- static DEVICE_ATTR(state, 0444, regulator_state_show, NULL);
- static ssize_t regulator_status_show(struct device *dev,
- struct device_attribute *attr, char *buf)
- {
- struct regulator_dev *rdev = dev_get_drvdata(dev);
- int status;
- char *label;
- status = rdev->desc->ops->get_status(rdev);
- if (status < 0)
- return status;
- switch (status) {
- case REGULATOR_STATUS_OFF:
- label = "off";
- break;
- case REGULATOR_STATUS_ON:
- label = "on";
- break;
- case REGULATOR_STATUS_ERROR:
- label = "error";
- break;
- case REGULATOR_STATUS_FAST:
- label = "fast";
- break;
- case REGULATOR_STATUS_NORMAL:
- label = "normal";
- break;
- case REGULATOR_STATUS_IDLE:
- label = "idle";
- break;
- case REGULATOR_STATUS_STANDBY:
- label = "standby";
- break;
- case REGULATOR_STATUS_BYPASS:
- label = "bypass";
- break;
- case REGULATOR_STATUS_UNDEFINED:
- label = "undefined";
- break;
- default:
- return -ERANGE;
- }
- return sprintf(buf, "%s\n", label);
- }
- static DEVICE_ATTR(status, 0444, regulator_status_show, NULL);
- static ssize_t regulator_min_uA_show(struct device *dev,
- struct device_attribute *attr, char *buf)
- {
- struct regulator_dev *rdev = dev_get_drvdata(dev);
- if (!rdev->constraints)
- return sprintf(buf, "constraint not defined\n");
- return sprintf(buf, "%d\n", rdev->constraints->min_uA);
- }
- static DEVICE_ATTR(min_microamps, 0444, regulator_min_uA_show, NULL);
- static ssize_t regulator_max_uA_show(struct device *dev,
- struct device_attribute *attr, char *buf)
- {
- struct regulator_dev *rdev = dev_get_drvdata(dev);
- if (!rdev->constraints)
- return sprintf(buf, "constraint not defined\n");
- return sprintf(buf, "%d\n", rdev->constraints->max_uA);
- }
- static DEVICE_ATTR(max_microamps, 0444, regulator_max_uA_show, NULL);
- static ssize_t regulator_min_uV_show(struct device *dev,
- struct device_attribute *attr, char *buf)
- {
- struct regulator_dev *rdev = dev_get_drvdata(dev);
- if (!rdev->constraints)
- return sprintf(buf, "constraint not defined\n");
- return sprintf(buf, "%d\n", rdev->constraints->min_uV);
- }
- static DEVICE_ATTR(min_microvolts, 0444, regulator_min_uV_show, NULL);
- static ssize_t regulator_max_uV_show(struct device *dev,
- struct device_attribute *attr, char *buf)
- {
- struct regulator_dev *rdev = dev_get_drvdata(dev);
- if (!rdev->constraints)
- return sprintf(buf, "constraint not defined\n");
- return sprintf(buf, "%d\n", rdev->constraints->max_uV);
- }
- static DEVICE_ATTR(max_microvolts, 0444, regulator_max_uV_show, NULL);
- static ssize_t regulator_total_uA_show(struct device *dev,
- struct device_attribute *attr, char *buf)
- {
- struct regulator_dev *rdev = dev_get_drvdata(dev);
- struct regulator *regulator;
- int uA = 0;
- regulator_lock(rdev);
- list_for_each_entry(regulator, &rdev->consumer_list, list) {
- if (regulator->enable_count)
- uA += regulator->uA_load;
- }
- regulator_unlock(rdev);
- return sprintf(buf, "%d\n", uA);
- }
- static DEVICE_ATTR(requested_microamps, 0444, regulator_total_uA_show, NULL);
- static ssize_t num_users_show(struct device *dev, struct device_attribute *attr,
- char *buf)
- {
- struct regulator_dev *rdev = dev_get_drvdata(dev);
- return sprintf(buf, "%d\n", rdev->use_count);
- }
- static DEVICE_ATTR_RO(num_users);
- static ssize_t type_show(struct device *dev, struct device_attribute *attr,
- char *buf)
- {
- struct regulator_dev *rdev = dev_get_drvdata(dev);
- switch (rdev->desc->type) {
- case REGULATOR_VOLTAGE:
- return sprintf(buf, "voltage\n");
- case REGULATOR_CURRENT:
- return sprintf(buf, "current\n");
- }
- return sprintf(buf, "unknown\n");
- }
- static DEVICE_ATTR_RO(type);
- static ssize_t regulator_suspend_mem_uV_show(struct device *dev,
- struct device_attribute *attr, char *buf)
- {
- struct regulator_dev *rdev = dev_get_drvdata(dev);
- return sprintf(buf, "%d\n", rdev->constraints->state_mem.uV);
- }
- static DEVICE_ATTR(suspend_mem_microvolts, 0444,
- regulator_suspend_mem_uV_show, NULL);
- static ssize_t regulator_suspend_disk_uV_show(struct device *dev,
- struct device_attribute *attr, char *buf)
- {
- struct regulator_dev *rdev = dev_get_drvdata(dev);
- return sprintf(buf, "%d\n", rdev->constraints->state_disk.uV);
- }
- static DEVICE_ATTR(suspend_disk_microvolts, 0444,
- regulator_suspend_disk_uV_show, NULL);
- static ssize_t regulator_suspend_standby_uV_show(struct device *dev,
- struct device_attribute *attr, char *buf)
- {
- struct regulator_dev *rdev = dev_get_drvdata(dev);
- return sprintf(buf, "%d\n", rdev->constraints->state_standby.uV);
- }
- static DEVICE_ATTR(suspend_standby_microvolts, 0444,
- regulator_suspend_standby_uV_show, NULL);
- static ssize_t regulator_suspend_mem_mode_show(struct device *dev,
- struct device_attribute *attr, char *buf)
- {
- struct regulator_dev *rdev = dev_get_drvdata(dev);
- return regulator_print_opmode(buf,
- rdev->constraints->state_mem.mode);
- }
- static DEVICE_ATTR(suspend_mem_mode, 0444,
- regulator_suspend_mem_mode_show, NULL);
- static ssize_t regulator_suspend_disk_mode_show(struct device *dev,
- struct device_attribute *attr, char *buf)
- {
- struct regulator_dev *rdev = dev_get_drvdata(dev);
- return regulator_print_opmode(buf,
- rdev->constraints->state_disk.mode);
- }
- static DEVICE_ATTR(suspend_disk_mode, 0444,
- regulator_suspend_disk_mode_show, NULL);
- static ssize_t regulator_suspend_standby_mode_show(struct device *dev,
- struct device_attribute *attr, char *buf)
- {
- struct regulator_dev *rdev = dev_get_drvdata(dev);
- return regulator_print_opmode(buf,
- rdev->constraints->state_standby.mode);
- }
- static DEVICE_ATTR(suspend_standby_mode, 0444,
- regulator_suspend_standby_mode_show, NULL);
- static ssize_t regulator_suspend_mem_state_show(struct device *dev,
- struct device_attribute *attr, char *buf)
- {
- struct regulator_dev *rdev = dev_get_drvdata(dev);
- return regulator_print_state(buf,
- rdev->constraints->state_mem.enabled);
- }
- static DEVICE_ATTR(suspend_mem_state, 0444,
- regulator_suspend_mem_state_show, NULL);
- static ssize_t regulator_suspend_disk_state_show(struct device *dev,
- struct device_attribute *attr, char *buf)
- {
- struct regulator_dev *rdev = dev_get_drvdata(dev);
- return regulator_print_state(buf,
- rdev->constraints->state_disk.enabled);
- }
- static DEVICE_ATTR(suspend_disk_state, 0444,
- regulator_suspend_disk_state_show, NULL);
- static ssize_t regulator_suspend_standby_state_show(struct device *dev,
- struct device_attribute *attr, char *buf)
- {
- struct regulator_dev *rdev = dev_get_drvdata(dev);
- return regulator_print_state(buf,
- rdev->constraints->state_standby.enabled);
- }
- static DEVICE_ATTR(suspend_standby_state, 0444,
- regulator_suspend_standby_state_show, NULL);
- static ssize_t regulator_bypass_show(struct device *dev,
- struct device_attribute *attr, char *buf)
- {
- struct regulator_dev *rdev = dev_get_drvdata(dev);
- const char *report;
- bool bypass;
- int ret;
- ret = rdev->desc->ops->get_bypass(rdev, &bypass);
- if (ret != 0)
- report = "unknown";
- else if (bypass)
- report = "enabled";
- else
- report = "disabled";
- return sprintf(buf, "%s\n", report);
- }
- static DEVICE_ATTR(bypass, 0444,
- regulator_bypass_show, NULL);
- /* Calculate the new optimum regulator operating mode based on the new total
- * consumer load. All locks held by caller */
- static int drms_uA_update(struct regulator_dev *rdev)
- {
- struct regulator *sibling;
- int current_uA = 0, output_uV, input_uV, err;
- unsigned int mode;
- /*
- * first check to see if we can set modes at all, otherwise just
- * tell the consumer everything is OK.
- */
- if (!regulator_ops_is_valid(rdev, REGULATOR_CHANGE_DRMS)) {
- rdev_dbg(rdev, "DRMS operation not allowed\n");
- return 0;
- }
- if (!rdev->desc->ops->get_optimum_mode &&
- !rdev->desc->ops->set_load)
- return 0;
- if (!rdev->desc->ops->set_mode &&
- !rdev->desc->ops->set_load)
- return -EINVAL;
- /* calc total requested load */
- list_for_each_entry(sibling, &rdev->consumer_list, list) {
- if (sibling->enable_count)
- current_uA += sibling->uA_load;
- }
- current_uA += rdev->constraints->system_load;
- if (rdev->desc->ops->set_load) {
- /* set the optimum mode for our new total regulator load */
- err = rdev->desc->ops->set_load(rdev, current_uA);
- if (err < 0)
- rdev_err(rdev, "failed to set load %d: %pe\n",
- current_uA, ERR_PTR(err));
- } else {
- /* get output voltage */
- output_uV = regulator_get_voltage_rdev(rdev);
- if (output_uV <= 0) {
- rdev_err(rdev, "invalid output voltage found\n");
- return -EINVAL;
- }
- /* get input voltage */
- input_uV = 0;
- if (rdev->supply)
- input_uV = regulator_get_voltage(rdev->supply);
- if (input_uV <= 0)
- input_uV = rdev->constraints->input_uV;
- if (input_uV <= 0) {
- rdev_err(rdev, "invalid input voltage found\n");
- return -EINVAL;
- }
- /* now get the optimum mode for our new total regulator load */
- mode = rdev->desc->ops->get_optimum_mode(rdev, input_uV,
- output_uV, current_uA);
- /* check the new mode is allowed */
- err = regulator_mode_constrain(rdev, &mode);
- if (err < 0) {
- rdev_err(rdev, "failed to get optimum mode @ %d uA %d -> %d uV: %pe\n",
- current_uA, input_uV, output_uV, ERR_PTR(err));
- return err;
- }
- err = rdev->desc->ops->set_mode(rdev, mode);
- if (err < 0)
- rdev_err(rdev, "failed to set optimum mode %x: %pe\n",
- mode, ERR_PTR(err));
- }
- return err;
- }
- static int __suspend_set_state(struct regulator_dev *rdev,
- const struct regulator_state *rstate)
- {
- int ret = 0;
- if (rstate->enabled == ENABLE_IN_SUSPEND &&
- rdev->desc->ops->set_suspend_enable)
- ret = rdev->desc->ops->set_suspend_enable(rdev);
- else if (rstate->enabled == DISABLE_IN_SUSPEND &&
- rdev->desc->ops->set_suspend_disable)
- ret = rdev->desc->ops->set_suspend_disable(rdev);
- else /* OK if set_suspend_enable or set_suspend_disable is NULL */
- ret = 0;
- if (ret < 0) {
- rdev_err(rdev, "failed to enabled/disable: %pe\n", ERR_PTR(ret));
- return ret;
- }
- if (rdev->desc->ops->set_suspend_voltage && rstate->uV > 0) {
- ret = rdev->desc->ops->set_suspend_voltage(rdev, rstate->uV);
- if (ret < 0) {
- rdev_err(rdev, "failed to set voltage: %pe\n", ERR_PTR(ret));
- return ret;
- }
- }
- if (rdev->desc->ops->set_suspend_mode && rstate->mode > 0) {
- ret = rdev->desc->ops->set_suspend_mode(rdev, rstate->mode);
- if (ret < 0) {
- rdev_err(rdev, "failed to set mode: %pe\n", ERR_PTR(ret));
- return ret;
- }
- }
- return ret;
- }
- static int suspend_set_initial_state(struct regulator_dev *rdev)
- {
- const struct regulator_state *rstate;
- rstate = regulator_get_suspend_state_check(rdev,
- rdev->constraints->initial_state);
- if (!rstate)
- return 0;
- return __suspend_set_state(rdev, rstate);
- }
- #if defined(DEBUG) || defined(CONFIG_DYNAMIC_DEBUG)
- static void print_constraints_debug(struct regulator_dev *rdev)
- {
- struct regulation_constraints *constraints = rdev->constraints;
- char buf[160] = "";
- size_t len = sizeof(buf) - 1;
- int count = 0;
- int ret;
- if (constraints->min_uV && constraints->max_uV) {
- if (constraints->min_uV == constraints->max_uV)
- count += scnprintf(buf + count, len - count, "%d mV ",
- constraints->min_uV / 1000);
- else
- count += scnprintf(buf + count, len - count,
- "%d <--> %d mV ",
- constraints->min_uV / 1000,
- constraints->max_uV / 1000);
- }
- if (!constraints->min_uV ||
- constraints->min_uV != constraints->max_uV) {
- ret = regulator_get_voltage_rdev(rdev);
- if (ret > 0)
- count += scnprintf(buf + count, len - count,
- "at %d mV ", ret / 1000);
- }
- if (constraints->uV_offset)
- count += scnprintf(buf + count, len - count, "%dmV offset ",
- constraints->uV_offset / 1000);
- if (constraints->min_uA && constraints->max_uA) {
- if (constraints->min_uA == constraints->max_uA)
- count += scnprintf(buf + count, len - count, "%d mA ",
- constraints->min_uA / 1000);
- else
- count += scnprintf(buf + count, len - count,
- "%d <--> %d mA ",
- constraints->min_uA / 1000,
- constraints->max_uA / 1000);
- }
- if (!constraints->min_uA ||
- constraints->min_uA != constraints->max_uA) {
- ret = _regulator_get_current_limit(rdev);
- if (ret > 0)
- count += scnprintf(buf + count, len - count,
- "at %d mA ", ret / 1000);
- }
- if (constraints->valid_modes_mask & REGULATOR_MODE_FAST)
- count += scnprintf(buf + count, len - count, "fast ");
- if (constraints->valid_modes_mask & REGULATOR_MODE_NORMAL)
- count += scnprintf(buf + count, len - count, "normal ");
- if (constraints->valid_modes_mask & REGULATOR_MODE_IDLE)
- count += scnprintf(buf + count, len - count, "idle ");
- if (constraints->valid_modes_mask & REGULATOR_MODE_STANDBY)
- count += scnprintf(buf + count, len - count, "standby ");
- if (!count)
- count = scnprintf(buf, len, "no parameters");
- else
- --count;
- count += scnprintf(buf + count, len - count, ", %s",
- _regulator_is_enabled(rdev) ? "enabled" : "disabled");
- rdev_dbg(rdev, "%s\n", buf);
- }
- #else /* !DEBUG && !CONFIG_DYNAMIC_DEBUG */
- static inline void print_constraints_debug(struct regulator_dev *rdev) {}
- #endif /* !DEBUG && !CONFIG_DYNAMIC_DEBUG */
- static void print_constraints(struct regulator_dev *rdev)
- {
- struct regulation_constraints *constraints = rdev->constraints;
- print_constraints_debug(rdev);
- if ((constraints->min_uV != constraints->max_uV) &&
- !regulator_ops_is_valid(rdev, REGULATOR_CHANGE_VOLTAGE))
- rdev_warn(rdev,
- "Voltage range but no REGULATOR_CHANGE_VOLTAGE\n");
- }
- static int machine_constraints_voltage(struct regulator_dev *rdev,
- struct regulation_constraints *constraints)
- {
- const struct regulator_ops *ops = rdev->desc->ops;
- int ret;
- /* do we need to apply the constraint voltage */
- if (rdev->constraints->apply_uV &&
- rdev->constraints->min_uV && rdev->constraints->max_uV) {
- int target_min, target_max;
- int current_uV = regulator_get_voltage_rdev(rdev);
- if (current_uV == -ENOTRECOVERABLE) {
- /* This regulator can't be read and must be initialized */
- rdev_info(rdev, "Setting %d-%duV\n",
- rdev->constraints->min_uV,
- rdev->constraints->max_uV);
- _regulator_do_set_voltage(rdev,
- rdev->constraints->min_uV,
- rdev->constraints->max_uV);
- current_uV = regulator_get_voltage_rdev(rdev);
- }
- if (current_uV < 0) {
- rdev_err(rdev,
- "failed to get the current voltage: %pe\n",
- ERR_PTR(current_uV));
- return current_uV;
- }
- /*
- * If we're below the minimum voltage move up to the
- * minimum voltage, if we're above the maximum voltage
- * then move down to the maximum.
- */
- target_min = current_uV;
- target_max = current_uV;
- if (current_uV < rdev->constraints->min_uV) {
- target_min = rdev->constraints->min_uV;
- target_max = rdev->constraints->min_uV;
- }
- if (current_uV > rdev->constraints->max_uV) {
- target_min = rdev->constraints->max_uV;
- target_max = rdev->constraints->max_uV;
- }
- if (target_min != current_uV || target_max != current_uV) {
- rdev_info(rdev, "Bringing %duV into %d-%duV\n",
- current_uV, target_min, target_max);
- ret = _regulator_do_set_voltage(
- rdev, target_min, target_max);
- if (ret < 0) {
- rdev_err(rdev,
- "failed to apply %d-%duV constraint: %pe\n",
- target_min, target_max, ERR_PTR(ret));
- return ret;
- }
- }
- }
- /* constrain machine-level voltage specs to fit
- * the actual range supported by this regulator.
- */
- if (ops->list_voltage && rdev->desc->n_voltages) {
- int count = rdev->desc->n_voltages;
- int i;
- int min_uV = INT_MAX;
- int max_uV = INT_MIN;
- int cmin = constraints->min_uV;
- int cmax = constraints->max_uV;
- /* it's safe to autoconfigure fixed-voltage supplies
- and the constraints are used by list_voltage. */
- if (count == 1 && !cmin) {
- cmin = 1;
- cmax = INT_MAX;
- constraints->min_uV = cmin;
- constraints->max_uV = cmax;
- }
- /* voltage constraints are optional */
- if ((cmin == 0) && (cmax == 0))
- return 0;
- /* else require explicit machine-level constraints */
- if (cmin <= 0 || cmax <= 0 || cmax < cmin) {
- rdev_err(rdev, "invalid voltage constraints\n");
- return -EINVAL;
- }
- /* no need to loop voltages if range is continuous */
- if (rdev->desc->continuous_voltage_range)
- return 0;
- /* initial: [cmin..cmax] valid, [min_uV..max_uV] not */
- for (i = 0; i < count; i++) {
- int value;
- value = ops->list_voltage(rdev, i);
- if (value <= 0)
- continue;
- /* maybe adjust [min_uV..max_uV] */
- if (value >= cmin && value < min_uV)
- min_uV = value;
- if (value <= cmax && value > max_uV)
- max_uV = value;
- }
- /* final: [min_uV..max_uV] valid iff constraints valid */
- if (max_uV < min_uV) {
- rdev_err(rdev,
- "unsupportable voltage constraints %u-%uuV\n",
- min_uV, max_uV);
- return -EINVAL;
- }
- /* use regulator's subset of machine constraints */
- if (constraints->min_uV < min_uV) {
- rdev_dbg(rdev, "override min_uV, %d -> %d\n",
- constraints->min_uV, min_uV);
- constraints->min_uV = min_uV;
- }
- if (constraints->max_uV > max_uV) {
- rdev_dbg(rdev, "override max_uV, %d -> %d\n",
- constraints->max_uV, max_uV);
- constraints->max_uV = max_uV;
- }
- }
- return 0;
- }
- static int machine_constraints_current(struct regulator_dev *rdev,
- struct regulation_constraints *constraints)
- {
- const struct regulator_ops *ops = rdev->desc->ops;
- int ret;
- if (!constraints->min_uA && !constraints->max_uA)
- return 0;
- if (constraints->min_uA > constraints->max_uA) {
- rdev_err(rdev, "Invalid current constraints\n");
- return -EINVAL;
- }
- if (!ops->set_current_limit || !ops->get_current_limit) {
- rdev_warn(rdev, "Operation of current configuration missing\n");
- return 0;
- }
- /* Set regulator current in constraints range */
- ret = ops->set_current_limit(rdev, constraints->min_uA,
- constraints->max_uA);
- if (ret < 0) {
- rdev_err(rdev, "Failed to set current constraint, %d\n", ret);
- return ret;
- }
- return 0;
- }
- static int _regulator_do_enable(struct regulator_dev *rdev);
- /**
- * set_machine_constraints - sets regulator constraints
- * @rdev: regulator source
- *
- * Allows platform initialisation code to define and constrain
- * regulator circuits e.g. valid voltage/current ranges, etc. NOTE:
- * Constraints *must* be set by platform code in order for some
- * regulator operations to proceed i.e. set_voltage, set_current_limit,
- * set_mode.
- */
- static int set_machine_constraints(struct regulator_dev *rdev)
- {
- int ret = 0;
- const struct regulator_ops *ops = rdev->desc->ops;
- ret = machine_constraints_voltage(rdev, rdev->constraints);
- if (ret != 0)
- return ret;
- ret = machine_constraints_current(rdev, rdev->constraints);
- if (ret != 0)
- return ret;
- if (rdev->constraints->ilim_uA && ops->set_input_current_limit) {
- ret = ops->set_input_current_limit(rdev,
- rdev->constraints->ilim_uA);
- if (ret < 0) {
- rdev_err(rdev, "failed to set input limit: %pe\n", ERR_PTR(ret));
- return ret;
- }
- }
- /* do we need to setup our suspend state */
- if (rdev->constraints->initial_state) {
- ret = suspend_set_initial_state(rdev);
- if (ret < 0) {
- rdev_err(rdev, "failed to set suspend state: %pe\n", ERR_PTR(ret));
- return ret;
- }
- }
- if (rdev->constraints->initial_mode) {
- if (!ops->set_mode) {
- rdev_err(rdev, "no set_mode operation\n");
- return -EINVAL;
- }
- ret = ops->set_mode(rdev, rdev->constraints->initial_mode);
- if (ret < 0) {
- rdev_err(rdev, "failed to set initial mode: %pe\n", ERR_PTR(ret));
- return ret;
- }
- } else if (rdev->constraints->system_load) {
- /*
- * We'll only apply the initial system load if an
- * initial mode wasn't specified.
- */
- drms_uA_update(rdev);
- }
- if ((rdev->constraints->ramp_delay || rdev->constraints->ramp_disable)
- && ops->set_ramp_delay) {
- ret = ops->set_ramp_delay(rdev, rdev->constraints->ramp_delay);
- if (ret < 0) {
- rdev_err(rdev, "failed to set ramp_delay: %pe\n", ERR_PTR(ret));
- return ret;
- }
- }
- if (rdev->constraints->pull_down && ops->set_pull_down) {
- ret = ops->set_pull_down(rdev);
- if (ret < 0) {
- rdev_err(rdev, "failed to set pull down: %pe\n", ERR_PTR(ret));
- return ret;
- }
- }
- if (rdev->constraints->soft_start && ops->set_soft_start) {
- ret = ops->set_soft_start(rdev);
- if (ret < 0) {
- rdev_err(rdev, "failed to set soft start: %pe\n", ERR_PTR(ret));
- return ret;
- }
- }
- if (rdev->constraints->over_current_protection
- && ops->set_over_current_protection) {
- ret = ops->set_over_current_protection(rdev);
- if (ret < 0) {
- rdev_err(rdev, "failed to set over current protection: %pe\n",
- ERR_PTR(ret));
- return ret;
- }
- }
- if (rdev->constraints->active_discharge && ops->set_active_discharge) {
- bool ad_state = (rdev->constraints->active_discharge ==
- REGULATOR_ACTIVE_DISCHARGE_ENABLE) ? true : false;
- ret = ops->set_active_discharge(rdev, ad_state);
- if (ret < 0) {
- rdev_err(rdev, "failed to set active discharge: %pe\n", ERR_PTR(ret));
- return ret;
- }
- }
- /* If the constraints say the regulator should be on at this point
- * and we have control then make sure it is enabled.
- */
- if (rdev->constraints->always_on || rdev->constraints->boot_on) {
- /* If we want to enable this regulator, make sure that we know
- * the supplying regulator.
- */
- if (rdev->supply_name && !rdev->supply)
- return -EPROBE_DEFER;
- if (rdev->supply) {
- ret = regulator_enable(rdev->supply);
- if (ret < 0) {
- _regulator_put(rdev->supply);
- rdev->supply = NULL;
- return ret;
- }
- }
- ret = _regulator_do_enable(rdev);
- if (ret < 0 && ret != -EINVAL) {
- rdev_err(rdev, "failed to enable: %pe\n", ERR_PTR(ret));
- return ret;
- }
- if (rdev->constraints->always_on)
- rdev->use_count++;
- }
- print_constraints(rdev);
- return 0;
- }
- /**
- * set_supply - set regulator supply regulator
- * @rdev: regulator name
- * @supply_rdev: supply regulator name
- *
- * Called by platform initialisation code to set the supply regulator for this
- * regulator. This ensures that a regulators supply will also be enabled by the
- * core if it's child is enabled.
- */
- static int set_supply(struct regulator_dev *rdev,
- struct regulator_dev *supply_rdev)
- {
- int err;
- rdev_info(rdev, "supplied by %s\n", rdev_get_name(supply_rdev));
- if (!try_module_get(supply_rdev->owner))
- return -ENODEV;
- rdev->supply = create_regulator(supply_rdev, &rdev->dev, "SUPPLY");
- if (rdev->supply == NULL) {
- err = -ENOMEM;
- return err;
- }
- supply_rdev->open_count++;
- return 0;
- }
- /**
- * set_consumer_device_supply - Bind a regulator to a symbolic supply
- * @rdev: regulator source
- * @consumer_dev_name: dev_name() string for device supply applies to
- * @supply: symbolic name for supply
- *
- * Allows platform initialisation code to map physical regulator
- * sources to symbolic names for supplies for use by devices. Devices
- * should use these symbolic names to request regulators, avoiding the
- * need to provide board-specific regulator names as platform data.
- */
- static int set_consumer_device_supply(struct regulator_dev *rdev,
- const char *consumer_dev_name,
- const char *supply)
- {
- struct regulator_map *node, *new_node;
- int has_dev;
- if (supply == NULL)
- return -EINVAL;
- if (consumer_dev_name != NULL)
- has_dev = 1;
- else
- has_dev = 0;
- new_node = kzalloc(sizeof(struct regulator_map), GFP_KERNEL);
- if (new_node == NULL)
- return -ENOMEM;
- new_node->regulator = rdev;
- new_node->supply = supply;
- if (has_dev) {
- new_node->dev_name = kstrdup(consumer_dev_name, GFP_KERNEL);
- if (new_node->dev_name == NULL) {
- kfree(new_node);
- return -ENOMEM;
- }
- }
- mutex_lock(®ulator_list_mutex);
- list_for_each_entry(node, ®ulator_map_list, list) {
- if (node->dev_name && consumer_dev_name) {
- if (strcmp(node->dev_name, consumer_dev_name) != 0)
- continue;
- } else if (node->dev_name || consumer_dev_name) {
- continue;
- }
- if (strcmp(node->supply, supply) != 0)
- continue;
- pr_debug("%s: %s/%s is '%s' supply; fail %s/%s\n",
- consumer_dev_name,
- dev_name(&node->regulator->dev),
- node->regulator->desc->name,
- supply,
- dev_name(&rdev->dev), rdev_get_name(rdev));
- goto fail;
- }
- list_add(&new_node->list, ®ulator_map_list);
- mutex_unlock(®ulator_list_mutex);
- return 0;
- fail:
- mutex_unlock(®ulator_list_mutex);
- kfree(new_node->dev_name);
- kfree(new_node);
- return -EBUSY;
- }
- static void unset_regulator_supplies(struct regulator_dev *rdev)
- {
- struct regulator_map *node, *n;
- list_for_each_entry_safe(node, n, ®ulator_map_list, list) {
- if (rdev == node->regulator) {
- list_del(&node->list);
- kfree(node->dev_name);
- kfree(node);
- }
- }
- }
- #ifdef CONFIG_DEBUG_FS
- static ssize_t constraint_flags_read_file(struct file *file,
- char __user *user_buf,
- size_t count, loff_t *ppos)
- {
- const struct regulator *regulator = file->private_data;
- const struct regulation_constraints *c = regulator->rdev->constraints;
- char *buf;
- ssize_t ret;
- if (!c)
- return 0;
- buf = kmalloc(PAGE_SIZE, GFP_KERNEL);
- if (!buf)
- return -ENOMEM;
- ret = snprintf(buf, PAGE_SIZE,
- "always_on: %u\n"
- "boot_on: %u\n"
- "apply_uV: %u\n"
- "ramp_disable: %u\n"
- "soft_start: %u\n"
- "pull_down: %u\n"
- "over_current_protection: %u\n",
- c->always_on,
- c->boot_on,
- c->apply_uV,
- c->ramp_disable,
- c->soft_start,
- c->pull_down,
- c->over_current_protection);
- ret = simple_read_from_buffer(user_buf, count, ppos, buf, ret);
- kfree(buf);
- return ret;
- }
- #endif
- static const struct file_operations constraint_flags_fops = {
- #ifdef CONFIG_DEBUG_FS
- .open = simple_open,
- .read = constraint_flags_read_file,
- .llseek = default_llseek,
- #endif
- };
- #define REG_STR_SIZE 64
- static struct regulator *create_regulator(struct regulator_dev *rdev,
- struct device *dev,
- const char *supply_name)
- {
- struct regulator *regulator;
- int err = 0;
- if (dev) {
- char buf[REG_STR_SIZE];
- int size;
- size = snprintf(buf, REG_STR_SIZE, "%s-%s",
- dev->kobj.name, supply_name);
- if (size >= REG_STR_SIZE)
- return NULL;
- supply_name = kstrdup(buf, GFP_KERNEL);
- if (supply_name == NULL)
- return NULL;
- } else {
- supply_name = kstrdup_const(supply_name, GFP_KERNEL);
- if (supply_name == NULL)
- return NULL;
- }
- regulator = kzalloc(sizeof(*regulator), GFP_KERNEL);
- if (regulator == NULL) {
- kfree(supply_name);
- return NULL;
- }
- regulator->rdev = rdev;
- regulator->supply_name = supply_name;
- regulator_lock(rdev);
- list_add(®ulator->list, &rdev->consumer_list);
- regulator_unlock(rdev);
- if (dev) {
- regulator->dev = dev;
- /* Add a link to the device sysfs entry */
- err = sysfs_create_link_nowarn(&rdev->dev.kobj, &dev->kobj,
- supply_name);
- if (err) {
- rdev_dbg(rdev, "could not add device link %s: %pe\n",
- dev->kobj.name, ERR_PTR(err));
- /* non-fatal */
- }
- }
- if (err != -EEXIST)
- regulator->debugfs = debugfs_create_dir(supply_name, rdev->debugfs);
- if (!regulator->debugfs) {
- rdev_dbg(rdev, "Failed to create debugfs directory\n");
- } else {
- debugfs_create_u32("uA_load", 0444, regulator->debugfs,
- ®ulator->uA_load);
- debugfs_create_u32("min_uV", 0444, regulator->debugfs,
- ®ulator->voltage[PM_SUSPEND_ON].min_uV);
- debugfs_create_u32("max_uV", 0444, regulator->debugfs,
- ®ulator->voltage[PM_SUSPEND_ON].max_uV);
- debugfs_create_file("constraint_flags", 0444,
- regulator->debugfs, regulator,
- &constraint_flags_fops);
- }
- /*
- * Check now if the regulator is an always on regulator - if
- * it is then we don't need to do nearly so much work for
- * enable/disable calls.
- */
- if (!regulator_ops_is_valid(rdev, REGULATOR_CHANGE_STATUS) &&
- _regulator_is_enabled(rdev))
- regulator->always_on = true;
- return regulator;
- }
- static int _regulator_get_enable_time(struct regulator_dev *rdev)
- {
- if (rdev->constraints && rdev->constraints->enable_time)
- return rdev->constraints->enable_time;
- if (rdev->desc->ops->enable_time)
- return rdev->desc->ops->enable_time(rdev);
- return rdev->desc->enable_time;
- }
- static struct regulator_supply_alias *regulator_find_supply_alias(
- struct device *dev, const char *supply)
- {
- struct regulator_supply_alias *map;
- list_for_each_entry(map, ®ulator_supply_alias_list, list)
- if (map->src_dev == dev && strcmp(map->src_supply, supply) == 0)
- return map;
- return NULL;
- }
- static void regulator_supply_alias(struct device **dev, const char **supply)
- {
- struct regulator_supply_alias *map;
- map = regulator_find_supply_alias(*dev, *supply);
- if (map) {
- dev_dbg(*dev, "Mapping supply %s to %s,%s\n",
- *supply, map->alias_supply,
- dev_name(map->alias_dev));
- *dev = map->alias_dev;
- *supply = map->alias_supply;
- }
- }
- static int regulator_match(struct device *dev, const void *data)
- {
- struct regulator_dev *r = dev_to_rdev(dev);
- return strcmp(rdev_get_name(r), data) == 0;
- }
- static struct regulator_dev *regulator_lookup_by_name(const char *name)
- {
- struct device *dev;
- dev = class_find_device(®ulator_class, NULL, name, regulator_match);
- return dev ? dev_to_rdev(dev) : NULL;
- }
- /**
- * regulator_dev_lookup - lookup a regulator device.
- * @dev: device for regulator "consumer".
- * @supply: Supply name or regulator ID.
- *
- * If successful, returns a struct regulator_dev that corresponds to the name
- * @supply and with the embedded struct device refcount incremented by one.
- * The refcount must be dropped by calling put_device().
- * On failure one of the following ERR-PTR-encoded values is returned:
- * -ENODEV if lookup fails permanently, -EPROBE_DEFER if lookup could succeed
- * in the future.
- */
- static struct regulator_dev *regulator_dev_lookup(struct device *dev,
- const char *supply)
- {
- struct regulator_dev *r = NULL;
- struct device_node *node;
- struct regulator_map *map;
- const char *devname = NULL;
- regulator_supply_alias(&dev, &supply);
- /* first do a dt based lookup */
- if (dev && dev->of_node) {
- node = of_get_regulator(dev, supply);
- if (node) {
- r = of_find_regulator_by_node(node);
- if (r)
- return r;
- /*
- * We have a node, but there is no device.
- * assume it has not registered yet.
- */
- return ERR_PTR(-EPROBE_DEFER);
- }
- }
- /* if not found, try doing it non-dt way */
- if (dev)
- devname = dev_name(dev);
- mutex_lock(®ulator_list_mutex);
- list_for_each_entry(map, ®ulator_map_list, list) {
- /* If the mapping has a device set up it must match */
- if (map->dev_name &&
- (!devname || strcmp(map->dev_name, devname)))
- continue;
- if (strcmp(map->supply, supply) == 0 &&
- get_device(&map->regulator->dev)) {
- r = map->regulator;
- break;
- }
- }
- mutex_unlock(®ulator_list_mutex);
- if (r)
- return r;
- r = regulator_lookup_by_name(supply);
- if (r)
- return r;
- return ERR_PTR(-ENODEV);
- }
- static int regulator_resolve_supply(struct regulator_dev *rdev)
- {
- struct regulator_dev *r;
- struct device *dev = rdev->dev.parent;
- int ret = 0;
- /* No supply to resolve? */
- if (!rdev->supply_name)
- return 0;
- /* Supply already resolved? (fast-path without locking contention) */
- if (rdev->supply)
- return 0;
- r = regulator_dev_lookup(dev, rdev->supply_name);
- if (IS_ERR(r)) {
- ret = PTR_ERR(r);
- /* Did the lookup explicitly defer for us? */
- if (ret == -EPROBE_DEFER)
- goto out;
- if (have_full_constraints()) {
- r = dummy_regulator_rdev;
- get_device(&r->dev);
- } else {
- dev_err(dev, "Failed to resolve %s-supply for %s\n",
- rdev->supply_name, rdev->desc->name);
- ret = -EPROBE_DEFER;
- goto out;
- }
- }
- if (r == rdev) {
- dev_err(dev, "Supply for %s (%s) resolved to itself\n",
- rdev->desc->name, rdev->supply_name);
- if (!have_full_constraints()) {
- ret = -EINVAL;
- goto out;
- }
- r = dummy_regulator_rdev;
- get_device(&r->dev);
- }
- /*
- * If the supply's parent device is not the same as the
- * regulator's parent device, then ensure the parent device
- * is bound before we resolve the supply, in case the parent
- * device get probe deferred and unregisters the supply.
- */
- if (r->dev.parent && r->dev.parent != rdev->dev.parent) {
- if (!device_is_bound(r->dev.parent)) {
- put_device(&r->dev);
- ret = -EPROBE_DEFER;
- goto out;
- }
- }
- /* Recursively resolve the supply of the supply */
- ret = regulator_resolve_supply(r);
- if (ret < 0) {
- put_device(&r->dev);
- goto out;
- }
- /*
- * Recheck rdev->supply with rdev->mutex lock held to avoid a race
- * between rdev->supply null check and setting rdev->supply in
- * set_supply() from concurrent tasks.
- */
- regulator_lock(rdev);
- /* Supply just resolved by a concurrent task? */
- if (rdev->supply) {
- regulator_unlock(rdev);
- put_device(&r->dev);
- goto out;
- }
- ret = set_supply(rdev, r);
- if (ret < 0) {
- regulator_unlock(rdev);
- put_device(&r->dev);
- goto out;
- }
- regulator_unlock(rdev);
- /*
- * In set_machine_constraints() we may have turned this regulator on
- * but we couldn't propagate to the supply if it hadn't been resolved
- * yet. Do it now.
- */
- if (rdev->use_count) {
- ret = regulator_enable(rdev->supply);
- if (ret < 0) {
- _regulator_put(rdev->supply);
- rdev->supply = NULL;
- goto out;
- }
- }
- out:
- return ret;
- }
- /* Internal regulator request function */
- struct regulator *_regulator_get(struct device *dev, const char *id,
- enum regulator_get_type get_type)
- {
- struct regulator_dev *rdev;
- struct regulator *regulator;
- struct device_link *link;
- int ret;
- if (get_type >= MAX_GET_TYPE) {
- dev_err(dev, "invalid type %d in %s\n", get_type, __func__);
- return ERR_PTR(-EINVAL);
- }
- if (id == NULL) {
- pr_err("get() with no identifier\n");
- return ERR_PTR(-EINVAL);
- }
- rdev = regulator_dev_lookup(dev, id);
- if (IS_ERR(rdev)) {
- ret = PTR_ERR(rdev);
- /*
- * If regulator_dev_lookup() fails with error other
- * than -ENODEV our job here is done, we simply return it.
- */
- if (ret != -ENODEV)
- return ERR_PTR(ret);
- if (!have_full_constraints()) {
- dev_warn(dev,
- "incomplete constraints, dummy supplies not allowed\n");
- return ERR_PTR(-ENODEV);
- }
- switch (get_type) {
- case NORMAL_GET:
- /*
- * Assume that a regulator is physically present and
- * enabled, even if it isn't hooked up, and just
- * provide a dummy.
- */
- dev_warn(dev, "supply %s not found, using dummy regulator\n", id);
- rdev = dummy_regulator_rdev;
- get_device(&rdev->dev);
- break;
- case EXCLUSIVE_GET:
- dev_warn(dev,
- "dummy supplies not allowed for exclusive requests\n");
- fallthrough;
- default:
- return ERR_PTR(-ENODEV);
- }
- }
- if (rdev->exclusive) {
- regulator = ERR_PTR(-EPERM);
- put_device(&rdev->dev);
- return regulator;
- }
- if (get_type == EXCLUSIVE_GET && rdev->open_count) {
- regulator = ERR_PTR(-EBUSY);
- put_device(&rdev->dev);
- return regulator;
- }
- mutex_lock(®ulator_list_mutex);
- ret = (rdev->coupling_desc.n_resolved != rdev->coupling_desc.n_coupled);
- mutex_unlock(®ulator_list_mutex);
- if (ret != 0) {
- regulator = ERR_PTR(-EPROBE_DEFER);
- put_device(&rdev->dev);
- return regulator;
- }
- ret = regulator_resolve_supply(rdev);
- if (ret < 0) {
- regulator = ERR_PTR(ret);
- put_device(&rdev->dev);
- return regulator;
- }
- if (!try_module_get(rdev->owner)) {
- regulator = ERR_PTR(-EPROBE_DEFER);
- put_device(&rdev->dev);
- return regulator;
- }
- regulator = create_regulator(rdev, dev, id);
- if (regulator == NULL) {
- regulator = ERR_PTR(-ENOMEM);
- module_put(rdev->owner);
- put_device(&rdev->dev);
- return regulator;
- }
- rdev->open_count++;
- if (get_type == EXCLUSIVE_GET) {
- rdev->exclusive = 1;
- ret = _regulator_is_enabled(rdev);
- if (ret > 0)
- rdev->use_count = 1;
- else
- rdev->use_count = 0;
- }
- link = device_link_add(dev, &rdev->dev, DL_FLAG_STATELESS);
- if (!IS_ERR_OR_NULL(link))
- regulator->device_link = true;
- return regulator;
- }
- /**
- * regulator_get - lookup and obtain a reference to a regulator.
- * @dev: device for regulator "consumer"
- * @id: Supply name or regulator ID.
- *
- * Returns a struct regulator corresponding to the regulator producer,
- * or IS_ERR() condition containing errno.
- *
- * Use of supply names configured via regulator_set_device_supply() is
- * strongly encouraged. It is recommended that the supply name used
- * should match the name used for the supply and/or the relevant
- * device pins in the datasheet.
- */
- struct regulator *regulator_get(struct device *dev, const char *id)
- {
- return _regulator_get(dev, id, NORMAL_GET);
- }
- EXPORT_SYMBOL_GPL(regulator_get);
- /**
- * regulator_get_exclusive - obtain exclusive access to a regulator.
- * @dev: device for regulator "consumer"
- * @id: Supply name or regulator ID.
- *
- * Returns a struct regulator corresponding to the regulator producer,
- * or IS_ERR() condition containing errno. Other consumers will be
- * unable to obtain this regulator while this reference is held and the
- * use count for the regulator will be initialised to reflect the current
- * state of the regulator.
- *
- * This is intended for use by consumers which cannot tolerate shared
- * use of the regulator such as those which need to force the
- * regulator off for correct operation of the hardware they are
- * controlling.
- *
- * Use of supply names configured via regulator_set_device_supply() is
- * strongly encouraged. It is recommended that the supply name used
- * should match the name used for the supply and/or the relevant
- * device pins in the datasheet.
- */
- struct regulator *regulator_get_exclusive(struct device *dev, const char *id)
- {
- return _regulator_get(dev, id, EXCLUSIVE_GET);
- }
- EXPORT_SYMBOL_GPL(regulator_get_exclusive);
- /**
- * regulator_get_optional - obtain optional access to a regulator.
- * @dev: device for regulator "consumer"
- * @id: Supply name or regulator ID.
- *
- * Returns a struct regulator corresponding to the regulator producer,
- * or IS_ERR() condition containing errno.
- *
- * This is intended for use by consumers for devices which can have
- * some supplies unconnected in normal use, such as some MMC devices.
- * It can allow the regulator core to provide stub supplies for other
- * supplies requested using normal regulator_get() calls without
- * disrupting the operation of drivers that can handle absent
- * supplies.
- *
- * Use of supply names configured via regulator_set_device_supply() is
- * strongly encouraged. It is recommended that the supply name used
- * should match the name used for the supply and/or the relevant
- * device pins in the datasheet.
- */
- struct regulator *regulator_get_optional(struct device *dev, const char *id)
- {
- return _regulator_get(dev, id, OPTIONAL_GET);
- }
- EXPORT_SYMBOL_GPL(regulator_get_optional);
- static void destroy_regulator(struct regulator *regulator)
- {
- struct regulator_dev *rdev = regulator->rdev;
- debugfs_remove_recursive(regulator->debugfs);
- if (regulator->dev) {
- if (regulator->device_link)
- device_link_remove(regulator->dev, &rdev->dev);
- /* remove any sysfs entries */
- sysfs_remove_link(&rdev->dev.kobj, regulator->supply_name);
- }
- regulator_lock(rdev);
- list_del(®ulator->list);
- rdev->open_count--;
- rdev->exclusive = 0;
- regulator_unlock(rdev);
- kfree_const(regulator->supply_name);
- kfree(regulator);
- }
- /* regulator_list_mutex lock held by regulator_put() */
- static void _regulator_put(struct regulator *regulator)
- {
- struct regulator_dev *rdev;
- if (IS_ERR_OR_NULL(regulator))
- return;
- lockdep_assert_held_once(®ulator_list_mutex);
- /* Docs say you must disable before calling regulator_put() */
- WARN_ON(regulator->enable_count);
- rdev = regulator->rdev;
- destroy_regulator(regulator);
- module_put(rdev->owner);
- put_device(&rdev->dev);
- }
- /**
- * regulator_put - "free" the regulator source
- * @regulator: regulator source
- *
- * Note: drivers must ensure that all regulator_enable calls made on this
- * regulator source are balanced by regulator_disable calls prior to calling
- * this function.
- */
- void regulator_put(struct regulator *regulator)
- {
- mutex_lock(®ulator_list_mutex);
- _regulator_put(regulator);
- mutex_unlock(®ulator_list_mutex);
- }
- EXPORT_SYMBOL_GPL(regulator_put);
- /**
- * regulator_register_supply_alias - Provide device alias for supply lookup
- *
- * @dev: device that will be given as the regulator "consumer"
- * @id: Supply name or regulator ID
- * @alias_dev: device that should be used to lookup the supply
- * @alias_id: Supply name or regulator ID that should be used to lookup the
- * supply
- *
- * All lookups for id on dev will instead be conducted for alias_id on
- * alias_dev.
- */
- int regulator_register_supply_alias(struct device *dev, const char *id,
- struct device *alias_dev,
- const char *alias_id)
- {
- struct regulator_supply_alias *map;
- map = regulator_find_supply_alias(dev, id);
- if (map)
- return -EEXIST;
- map = kzalloc(sizeof(struct regulator_supply_alias), GFP_KERNEL);
- if (!map)
- return -ENOMEM;
- map->src_dev = dev;
- map->src_supply = id;
- map->alias_dev = alias_dev;
- map->alias_supply = alias_id;
- list_add(&map->list, ®ulator_supply_alias_list);
- pr_info("Adding alias for supply %s,%s -> %s,%s\n",
- id, dev_name(dev), alias_id, dev_name(alias_dev));
- return 0;
- }
- EXPORT_SYMBOL_GPL(regulator_register_supply_alias);
- /**
- * regulator_unregister_supply_alias - Remove device alias
- *
- * @dev: device that will be given as the regulator "consumer"
- * @id: Supply name or regulator ID
- *
- * Remove a lookup alias if one exists for id on dev.
- */
- void regulator_unregister_supply_alias(struct device *dev, const char *id)
- {
- struct regulator_supply_alias *map;
- map = regulator_find_supply_alias(dev, id);
- if (map) {
- list_del(&map->list);
- kfree(map);
- }
- }
- EXPORT_SYMBOL_GPL(regulator_unregister_supply_alias);
- /**
- * regulator_bulk_register_supply_alias - register multiple aliases
- *
- * @dev: device that will be given as the regulator "consumer"
- * @id: List of supply names or regulator IDs
- * @alias_dev: device that should be used to lookup the supply
- * @alias_id: List of supply names or regulator IDs that should be used to
- * lookup the supply
- * @num_id: Number of aliases to register
- *
- * @return 0 on success, an errno on failure.
- *
- * This helper function allows drivers to register several supply
- * aliases in one operation. If any of the aliases cannot be
- * registered any aliases that were registered will be removed
- * before returning to the caller.
- */
- int regulator_bulk_register_supply_alias(struct device *dev,
- const char *const *id,
- struct device *alias_dev,
- const char *const *alias_id,
- int num_id)
- {
- int i;
- int ret;
- for (i = 0; i < num_id; ++i) {
- ret = regulator_register_supply_alias(dev, id[i], alias_dev,
- alias_id[i]);
- if (ret < 0)
- goto err;
- }
- return 0;
- err:
- dev_err(dev,
- "Failed to create supply alias %s,%s -> %s,%s\n",
- id[i], dev_name(dev), alias_id[i], dev_name(alias_dev));
- while (--i >= 0)
- regulator_unregister_supply_alias(dev, id[i]);
- return ret;
- }
- EXPORT_SYMBOL_GPL(regulator_bulk_register_supply_alias);
- /**
- * regulator_bulk_unregister_supply_alias - unregister multiple aliases
- *
- * @dev: device that will be given as the regulator "consumer"
- * @id: List of supply names or regulator IDs
- * @num_id: Number of aliases to unregister
- *
- * This helper function allows drivers to unregister several supply
- * aliases in one operation.
- */
- void regulator_bulk_unregister_supply_alias(struct device *dev,
- const char *const *id,
- int num_id)
- {
- int i;
- for (i = 0; i < num_id; ++i)
- regulator_unregister_supply_alias(dev, id[i]);
- }
- EXPORT_SYMBOL_GPL(regulator_bulk_unregister_supply_alias);
- /* Manage enable GPIO list. Same GPIO pin can be shared among regulators */
- static int regulator_ena_gpio_request(struct regulator_dev *rdev,
- const struct regulator_config *config)
- {
- struct regulator_enable_gpio *pin, *new_pin;
- struct gpio_desc *gpiod;
- gpiod = config->ena_gpiod;
- new_pin = kzalloc(sizeof(*new_pin), GFP_KERNEL);
- mutex_lock(®ulator_list_mutex);
- list_for_each_entry(pin, ®ulator_ena_gpio_list, list) {
- if (pin->gpiod == gpiod) {
- rdev_dbg(rdev, "GPIO is already used\n");
- goto update_ena_gpio_to_rdev;
- }
- }
- if (new_pin == NULL) {
- mutex_unlock(®ulator_list_mutex);
- return -ENOMEM;
- }
- pin = new_pin;
- new_pin = NULL;
- pin->gpiod = gpiod;
- list_add(&pin->list, ®ulator_ena_gpio_list);
- update_ena_gpio_to_rdev:
- pin->request_count++;
- rdev->ena_pin = pin;
- mutex_unlock(®ulator_list_mutex);
- kfree(new_pin);
- return 0;
- }
- static void regulator_ena_gpio_free(struct regulator_dev *rdev)
- {
- struct regulator_enable_gpio *pin, *n;
- if (!rdev->ena_pin)
- return;
- /* Free the GPIO only in case of no use */
- list_for_each_entry_safe(pin, n, ®ulator_ena_gpio_list, list) {
- if (pin != rdev->ena_pin)
- continue;
- if (--pin->request_count)
- break;
- gpiod_put(pin->gpiod);
- list_del(&pin->list);
- kfree(pin);
- break;
- }
- rdev->ena_pin = NULL;
- }
- /**
- * regulator_ena_gpio_ctrl - balance enable_count of each GPIO and actual GPIO pin control
- * @rdev: regulator_dev structure
- * @enable: enable GPIO at initial use?
- *
- * GPIO is enabled in case of initial use. (enable_count is 0)
- * GPIO is disabled when it is not shared any more. (enable_count <= 1)
- */
- static int regulator_ena_gpio_ctrl(struct regulator_dev *rdev, bool enable)
- {
- struct regulator_enable_gpio *pin = rdev->ena_pin;
- if (!pin)
- return -EINVAL;
- if (enable) {
- /* Enable GPIO at initial use */
- if (pin->enable_count == 0)
- gpiod_set_value_cansleep(pin->gpiod, 1);
- pin->enable_count++;
- } else {
- if (pin->enable_count > 1) {
- pin->enable_count--;
- return 0;
- }
- /* Disable GPIO if not used */
- if (pin->enable_count <= 1) {
- gpiod_set_value_cansleep(pin->gpiod, 0);
- pin->enable_count = 0;
- }
- }
- return 0;
- }
- /**
- * _regulator_enable_delay - a delay helper function
- * @delay: time to delay in microseconds
- *
- * Delay for the requested amount of time as per the guidelines in:
- *
- * Documentation/timers/timers-howto.rst
- *
- * The assumption here is that regulators will never be enabled in
- * atomic context and therefore sleeping functions can be used.
- */
- static void _regulator_enable_delay(unsigned int delay)
- {
- unsigned int ms = delay / 1000;
- unsigned int us = delay % 1000;
- if (ms > 0) {
- /*
- * For small enough values, handle super-millisecond
- * delays in the usleep_range() call below.
- */
- if (ms < 20)
- us += ms * 1000;
- else
- msleep(ms);
- }
- /*
- * Give the scheduler some room to coalesce with any other
- * wakeup sources. For delays shorter than 10 us, don't even
- * bother setting up high-resolution timers and just busy-
- * loop.
- */
- if (us >= 10)
- usleep_range(us, us + 100);
- else
- udelay(us);
- }
- /**
- * _regulator_check_status_enabled
- *
- * A helper function to check if the regulator status can be interpreted
- * as 'regulator is enabled'.
- * @rdev: the regulator device to check
- *
- * Return:
- * * 1 - if status shows regulator is in enabled state
- * * 0 - if not enabled state
- * * Error Value - as received from ops->get_status()
- */
- static inline int _regulator_check_status_enabled(struct regulator_dev *rdev)
- {
- int ret = rdev->desc->ops->get_status(rdev);
- if (ret < 0) {
- rdev_info(rdev, "get_status returned error: %d\n", ret);
- return ret;
- }
- switch (ret) {
- case REGULATOR_STATUS_OFF:
- case REGULATOR_STATUS_ERROR:
- case REGULATOR_STATUS_UNDEFINED:
- return 0;
- default:
- return 1;
- }
- }
- static int _regulator_do_enable(struct regulator_dev *rdev)
- {
- int ret, delay;
- /* Query before enabling in case configuration dependent. */
- ret = _regulator_get_enable_time(rdev);
- if (ret >= 0) {
- delay = ret;
- } else {
- rdev_warn(rdev, "enable_time() failed: %pe\n", ERR_PTR(ret));
- delay = 0;
- }
- trace_regulator_enable(rdev_get_name(rdev));
- if (rdev->desc->off_on_delay) {
- /* if needed, keep a distance of off_on_delay from last time
- * this regulator was disabled.
- */
- unsigned long start_jiffy = jiffies;
- unsigned long intended, max_delay, remaining;
- max_delay = usecs_to_jiffies(rdev->desc->off_on_delay);
- intended = rdev->last_off_jiffy + max_delay;
- if (time_before(start_jiffy, intended)) {
- /* calc remaining jiffies to deal with one-time
- * timer wrapping.
- * in case of multiple timer wrapping, either it can be
- * detected by out-of-range remaining, or it cannot be
- * detected and we get a penalty of
- * _regulator_enable_delay().
- */
- remaining = intended - start_jiffy;
- if (remaining <= max_delay)
- _regulator_enable_delay(
- jiffies_to_usecs(remaining));
- }
- }
- if (rdev->ena_pin) {
- if (!rdev->ena_gpio_state) {
- ret = regulator_ena_gpio_ctrl(rdev, true);
- if (ret < 0)
- return ret;
- rdev->ena_gpio_state = 1;
- }
- } else if (rdev->desc->ops->enable) {
- ret = rdev->desc->ops->enable(rdev);
- if (ret < 0)
- return ret;
- } else {
- return -EINVAL;
- }
- /* Allow the regulator to ramp; it would be useful to extend
- * this for bulk operations so that the regulators can ramp
- * together. */
- trace_regulator_enable_delay(rdev_get_name(rdev));
- /* If poll_enabled_time is set, poll upto the delay calculated
- * above, delaying poll_enabled_time uS to check if the regulator
- * actually got enabled.
- * If the regulator isn't enabled after enable_delay has
- * expired, return -ETIMEDOUT.
- */
- if (rdev->desc->poll_enabled_time) {
- unsigned int time_remaining = delay;
- while (time_remaining > 0) {
- _regulator_enable_delay(rdev->desc->poll_enabled_time);
- if (rdev->desc->ops->get_status) {
- ret = _regulator_check_status_enabled(rdev);
- if (ret < 0)
- return ret;
- else if (ret)
- break;
- } else if (rdev->desc->ops->is_enabled(rdev))
- break;
- time_remaining -= rdev->desc->poll_enabled_time;
- }
- if (time_remaining <= 0) {
- rdev_err(rdev, "Enabled check timed out\n");
- return -ETIMEDOUT;
- }
- } else {
- _regulator_enable_delay(delay);
- }
- trace_regulator_enable_complete(rdev_get_name(rdev));
- return 0;
- }
- /**
- * _regulator_handle_consumer_enable - handle that a consumer enabled
- * @regulator: regulator source
- *
- * Some things on a regulator consumer (like the contribution towards total
- * load on the regulator) only have an effect when the consumer wants the
- * regulator enabled. Explained in example with two consumers of the same
- * regulator:
- * consumer A: set_load(100); => total load = 0
- * consumer A: regulator_enable(); => total load = 100
- * consumer B: set_load(1000); => total load = 100
- * consumer B: regulator_enable(); => total load = 1100
- * consumer A: regulator_disable(); => total_load = 1000
- *
- * This function (together with _regulator_handle_consumer_disable) is
- * responsible for keeping track of the refcount for a given regulator consumer
- * and applying / unapplying these things.
- *
- * Returns 0 upon no error; -error upon error.
- */
- static int _regulator_handle_consumer_enable(struct regulator *regulator)
- {
- struct regulator_dev *rdev = regulator->rdev;
- lockdep_assert_held_once(&rdev->mutex.base);
- regulator->enable_count++;
- if (regulator->uA_load && regulator->enable_count == 1)
- return drms_uA_update(rdev);
- return 0;
- }
- /**
- * _regulator_handle_consumer_disable - handle that a consumer disabled
- * @regulator: regulator source
- *
- * The opposite of _regulator_handle_consumer_enable().
- *
- * Returns 0 upon no error; -error upon error.
- */
- static int _regulator_handle_consumer_disable(struct regulator *regulator)
- {
- struct regulator_dev *rdev = regulator->rdev;
- lockdep_assert_held_once(&rdev->mutex.base);
- if (!regulator->enable_count) {
- rdev_err(rdev, "Underflow of regulator enable count\n");
- return -EINVAL;
- }
- regulator->enable_count--;
- if (regulator->uA_load && regulator->enable_count == 0)
- return drms_uA_update(rdev);
- return 0;
- }
- /* locks held by regulator_enable() */
- static int _regulator_enable(struct regulator *regulator)
- {
- struct regulator_dev *rdev = regulator->rdev;
- int ret;
- lockdep_assert_held_once(&rdev->mutex.base);
- if (rdev->use_count == 0 && rdev->supply) {
- ret = _regulator_enable(rdev->supply);
- if (ret < 0)
- return ret;
- }
- /* balance only if there are regulators coupled */
- if (rdev->coupling_desc.n_coupled > 1) {
- ret = regulator_balance_voltage(rdev, PM_SUSPEND_ON);
- if (ret < 0)
- goto err_disable_supply;
- }
- ret = _regulator_handle_consumer_enable(regulator);
- if (ret < 0)
- goto err_disable_supply;
- if (rdev->use_count == 0) {
- /* The regulator may on if it's not switchable or left on */
- ret = _regulator_is_enabled(rdev);
- if (ret == -EINVAL || ret == 0) {
- if (!regulator_ops_is_valid(rdev,
- REGULATOR_CHANGE_STATUS)) {
- ret = -EPERM;
- goto err_consumer_disable;
- }
- ret = _regulator_do_enable(rdev);
- if (ret < 0)
- goto err_consumer_disable;
- _notifier_call_chain(rdev, REGULATOR_EVENT_ENABLE,
- NULL);
- } else if (ret < 0) {
- rdev_err(rdev, "is_enabled() failed: %pe\n", ERR_PTR(ret));
- goto err_consumer_disable;
- }
- /* Fallthrough on positive return values - already enabled */
- }
- rdev->use_count++;
- return 0;
- err_consumer_disable:
- _regulator_handle_consumer_disable(regulator);
- err_disable_supply:
- if (rdev->use_count == 0 && rdev->supply)
- _regulator_disable(rdev->supply);
- return ret;
- }
- /**
- * regulator_enable - enable regulator output
- * @regulator: regulator source
- *
- * Request that the regulator be enabled with the regulator output at
- * the predefined voltage or current value. Calls to regulator_enable()
- * must be balanced with calls to regulator_disable().
- *
- * NOTE: the output value can be set by other drivers, boot loader or may be
- * hardwired in the regulator.
- */
- int regulator_enable(struct regulator *regulator)
- {
- struct regulator_dev *rdev = regulator->rdev;
- struct ww_acquire_ctx ww_ctx;
- int ret;
- regulator_lock_dependent(rdev, &ww_ctx);
- ret = _regulator_enable(regulator);
- regulator_unlock_dependent(rdev, &ww_ctx);
- return ret;
- }
- EXPORT_SYMBOL_GPL(regulator_enable);
- static int _regulator_do_disable(struct regulator_dev *rdev)
- {
- int ret;
- trace_regulator_disable(rdev_get_name(rdev));
- if (rdev->ena_pin) {
- if (rdev->ena_gpio_state) {
- ret = regulator_ena_gpio_ctrl(rdev, false);
- if (ret < 0)
- return ret;
- rdev->ena_gpio_state = 0;
- }
- } else if (rdev->desc->ops->disable) {
- ret = rdev->desc->ops->disable(rdev);
- if (ret != 0)
- return ret;
- }
- /* cares about last_off_jiffy only if off_on_delay is required by
- * device.
- */
- if (rdev->desc->off_on_delay)
- rdev->last_off_jiffy = jiffies;
- trace_regulator_disable_complete(rdev_get_name(rdev));
- return 0;
- }
- /* locks held by regulator_disable() */
- static int _regulator_disable(struct regulator *regulator)
- {
- struct regulator_dev *rdev = regulator->rdev;
- int ret = 0;
- lockdep_assert_held_once(&rdev->mutex.base);
- if (WARN(rdev->use_count <= 0,
- "unbalanced disables for %s\n", rdev_get_name(rdev)))
- return -EIO;
- /* are we the last user and permitted to disable ? */
- if (rdev->use_count == 1 &&
- (rdev->constraints && !rdev->constraints->always_on)) {
- /* we are last user */
- if (regulator_ops_is_valid(rdev, REGULATOR_CHANGE_STATUS)) {
- ret = _notifier_call_chain(rdev,
- REGULATOR_EVENT_PRE_DISABLE,
- NULL);
- if (ret & NOTIFY_STOP_MASK)
- return -EINVAL;
- ret = _regulator_do_disable(rdev);
- if (ret < 0) {
- rdev_err(rdev, "failed to disable: %pe\n", ERR_PTR(ret));
- _notifier_call_chain(rdev,
- REGULATOR_EVENT_ABORT_DISABLE,
- NULL);
- return ret;
- }
- _notifier_call_chain(rdev, REGULATOR_EVENT_DISABLE,
- NULL);
- }
- rdev->use_count = 0;
- } else if (rdev->use_count > 1) {
- rdev->use_count--;
- }
- if (ret == 0)
- ret = _regulator_handle_consumer_disable(regulator);
- if (ret == 0 && rdev->coupling_desc.n_coupled > 1)
- ret = regulator_balance_voltage(rdev, PM_SUSPEND_ON);
- if (ret == 0 && rdev->use_count == 0 && rdev->supply)
- ret = _regulator_disable(rdev->supply);
- return ret;
- }
- /**
- * regulator_disable - disable regulator output
- * @regulator: regulator source
- *
- * Disable the regulator output voltage or current. Calls to
- * regulator_enable() must be balanced with calls to
- * regulator_disable().
- *
- * NOTE: this will only disable the regulator output if no other consumer
- * devices have it enabled, the regulator device supports disabling and
- * machine constraints permit this operation.
- */
- int regulator_disable(struct regulator *regulator)
- {
- struct regulator_dev *rdev = regulator->rdev;
- struct ww_acquire_ctx ww_ctx;
- int ret;
- regulator_lock_dependent(rdev, &ww_ctx);
- ret = _regulator_disable(regulator);
- regulator_unlock_dependent(rdev, &ww_ctx);
- return ret;
- }
- EXPORT_SYMBOL_GPL(regulator_disable);
- /* locks held by regulator_force_disable() */
- static int _regulator_force_disable(struct regulator_dev *rdev)
- {
- int ret = 0;
- lockdep_assert_held_once(&rdev->mutex.base);
- ret = _notifier_call_chain(rdev, REGULATOR_EVENT_FORCE_DISABLE |
- REGULATOR_EVENT_PRE_DISABLE, NULL);
- if (ret & NOTIFY_STOP_MASK)
- return -EINVAL;
- ret = _regulator_do_disable(rdev);
- if (ret < 0) {
- rdev_err(rdev, "failed to force disable: %pe\n", ERR_PTR(ret));
- _notifier_call_chain(rdev, REGULATOR_EVENT_FORCE_DISABLE |
- REGULATOR_EVENT_ABORT_DISABLE, NULL);
- return ret;
- }
- _notifier_call_chain(rdev, REGULATOR_EVENT_FORCE_DISABLE |
- REGULATOR_EVENT_DISABLE, NULL);
- return 0;
- }
- /**
- * regulator_force_disable - force disable regulator output
- * @regulator: regulator source
- *
- * Forcibly disable the regulator output voltage or current.
- * NOTE: this *will* disable the regulator output even if other consumer
- * devices have it enabled. This should be used for situations when device
- * damage will likely occur if the regulator is not disabled (e.g. over temp).
- */
- int regulator_force_disable(struct regulator *regulator)
- {
- struct regulator_dev *rdev = regulator->rdev;
- struct ww_acquire_ctx ww_ctx;
- int ret;
- regulator_lock_dependent(rdev, &ww_ctx);
- ret = _regulator_force_disable(regulator->rdev);
- if (rdev->coupling_desc.n_coupled > 1)
- regulator_balance_voltage(rdev, PM_SUSPEND_ON);
- if (regulator->uA_load) {
- regulator->uA_load = 0;
- ret = drms_uA_update(rdev);
- }
- if (rdev->use_count != 0 && rdev->supply)
- _regulator_disable(rdev->supply);
- regulator_unlock_dependent(rdev, &ww_ctx);
- return ret;
- }
- EXPORT_SYMBOL_GPL(regulator_force_disable);
- static void regulator_disable_work(struct work_struct *work)
- {
- struct regulator_dev *rdev = container_of(work, struct regulator_dev,
- disable_work.work);
- struct ww_acquire_ctx ww_ctx;
- int count, i, ret;
- struct regulator *regulator;
- int total_count = 0;
- regulator_lock_dependent(rdev, &ww_ctx);
- /*
- * Workqueue functions queue the new work instance while the previous
- * work instance is being processed. Cancel the queued work instance
- * as the work instance under processing does the job of the queued
- * work instance.
- */
- cancel_delayed_work(&rdev->disable_work);
- list_for_each_entry(regulator, &rdev->consumer_list, list) {
- count = regulator->deferred_disables;
- if (!count)
- continue;
- total_count += count;
- regulator->deferred_disables = 0;
- for (i = 0; i < count; i++) {
- ret = _regulator_disable(regulator);
- if (ret != 0)
- rdev_err(rdev, "Deferred disable failed: %pe\n",
- ERR_PTR(ret));
- }
- }
- WARN_ON(!total_count);
- if (rdev->coupling_desc.n_coupled > 1)
- regulator_balance_voltage(rdev, PM_SUSPEND_ON);
- regulator_unlock_dependent(rdev, &ww_ctx);
- }
- /**
- * regulator_disable_deferred - disable regulator output with delay
- * @regulator: regulator source
- * @ms: milliseconds until the regulator is disabled
- *
- * Execute regulator_disable() on the regulator after a delay. This
- * is intended for use with devices that require some time to quiesce.
- *
- * NOTE: this will only disable the regulator output if no other consumer
- * devices have it enabled, the regulator device supports disabling and
- * machine constraints permit this operation.
- */
- int regulator_disable_deferred(struct regulator *regulator, int ms)
- {
- struct regulator_dev *rdev = regulator->rdev;
- if (!ms)
- return regulator_disable(regulator);
- regulator_lock(rdev);
- regulator->deferred_disables++;
- mod_delayed_work(system_power_efficient_wq, &rdev->disable_work,
- msecs_to_jiffies(ms));
- regulator_unlock(rdev);
- return 0;
- }
- EXPORT_SYMBOL_GPL(regulator_disable_deferred);
- static int _regulator_is_enabled(struct regulator_dev *rdev)
- {
- /* A GPIO control always takes precedence */
- if (rdev->ena_pin)
- return rdev->ena_gpio_state;
- /* If we don't know then assume that the regulator is always on */
- if (!rdev->desc->ops->is_enabled)
- return 1;
- return rdev->desc->ops->is_enabled(rdev);
- }
- static int _regulator_list_voltage(struct regulator_dev *rdev,
- unsigned selector, int lock)
- {
- const struct regulator_ops *ops = rdev->desc->ops;
- int ret;
- if (rdev->desc->fixed_uV && rdev->desc->n_voltages == 1 && !selector)
- return rdev->desc->fixed_uV;
- if (ops->list_voltage) {
- if (selector >= rdev->desc->n_voltages)
- return -EINVAL;
- if (lock)
- regulator_lock(rdev);
- ret = ops->list_voltage(rdev, selector);
- if (lock)
- regulator_unlock(rdev);
- } else if (rdev->is_switch && rdev->supply) {
- ret = _regulator_list_voltage(rdev->supply->rdev,
- selector, lock);
- } else {
- return -EINVAL;
- }
- if (ret > 0) {
- if (ret < rdev->constraints->min_uV)
- ret = 0;
- else if (ret > rdev->constraints->max_uV)
- ret = 0;
- }
- return ret;
- }
- /**
- * regulator_is_enabled - is the regulator output enabled
- * @regulator: regulator source
- *
- * Returns positive if the regulator driver backing the source/client
- * has requested that the device be enabled, zero if it hasn't, else a
- * negative errno code.
- *
- * Note that the device backing this regulator handle can have multiple
- * users, so it might be enabled even if regulator_enable() was never
- * called for this particular source.
- */
- int regulator_is_enabled(struct regulator *regulator)
- {
- int ret;
- if (regulator->always_on)
- return 1;
- regulator_lock(regulator->rdev);
- ret = _regulator_is_enabled(regulator->rdev);
- regulator_unlock(regulator->rdev);
- return ret;
- }
- EXPORT_SYMBOL_GPL(regulator_is_enabled);
- /**
- * regulator_count_voltages - count regulator_list_voltage() selectors
- * @regulator: regulator source
- *
- * Returns number of selectors, or negative errno. Selectors are
- * numbered starting at zero, and typically correspond to bitfields
- * in hardware registers.
- */
- int regulator_count_voltages(struct regulator *regulator)
- {
- struct regulator_dev *rdev = regulator->rdev;
- if (rdev->desc->n_voltages)
- return rdev->desc->n_voltages;
- if (!rdev->is_switch || !rdev->supply)
- return -EINVAL;
- return regulator_count_voltages(rdev->supply);
- }
- EXPORT_SYMBOL_GPL(regulator_count_voltages);
- /**
- * regulator_list_voltage - enumerate supported voltages
- * @regulator: regulator source
- * @selector: identify voltage to list
- * Context: can sleep
- *
- * Returns a voltage that can be passed to @regulator_set_voltage(),
- * zero if this selector code can't be used on this system, or a
- * negative errno.
- */
- int regulator_list_voltage(struct regulator *regulator, unsigned selector)
- {
- return _regulator_list_voltage(regulator->rdev, selector, 1);
- }
- EXPORT_SYMBOL_GPL(regulator_list_voltage);
- /**
- * regulator_get_regmap - get the regulator's register map
- * @regulator: regulator source
- *
- * Returns the register map for the given regulator, or an ERR_PTR value
- * if the regulator doesn't use regmap.
- */
- struct regmap *regulator_get_regmap(struct regulator *regulator)
- {
- struct regmap *map = regulator->rdev->regmap;
- return map ? map : ERR_PTR(-EOPNOTSUPP);
- }
- /**
- * regulator_get_hardware_vsel_register - get the HW voltage selector register
- * @regulator: regulator source
- * @vsel_reg: voltage selector register, output parameter
- * @vsel_mask: mask for voltage selector bitfield, output parameter
- *
- * Returns the hardware register offset and bitmask used for setting the
- * regulator voltage. This might be useful when configuring voltage-scaling
- * hardware or firmware that can make I2C requests behind the kernel's back,
- * for example.
- *
- * On success, the output parameters @vsel_reg and @vsel_mask are filled in
- * and 0 is returned, otherwise a negative errno is returned.
- */
- int regulator_get_hardware_vsel_register(struct regulator *regulator,
- unsigned *vsel_reg,
- unsigned *vsel_mask)
- {
- struct regulator_dev *rdev = regulator->rdev;
- const struct regulator_ops *ops = rdev->desc->ops;
- if (ops->set_voltage_sel != regulator_set_voltage_sel_regmap)
- return -EOPNOTSUPP;
- *vsel_reg = rdev->desc->vsel_reg;
- *vsel_mask = rdev->desc->vsel_mask;
- return 0;
- }
- EXPORT_SYMBOL_GPL(regulator_get_hardware_vsel_register);
- /**
- * regulator_list_hardware_vsel - get the HW-specific register value for a selector
- * @regulator: regulator source
- * @selector: identify voltage to list
- *
- * Converts the selector to a hardware-specific voltage selector that can be
- * directly written to the regulator registers. The address of the voltage
- * register can be determined by calling @regulator_get_hardware_vsel_register.
- *
- * On error a negative errno is returned.
- */
- int regulator_list_hardware_vsel(struct regulator *regulator,
- unsigned selector)
- {
- struct regulator_dev *rdev = regulator->rdev;
- const struct regulator_ops *ops = rdev->desc->ops;
- if (selector >= rdev->desc->n_voltages)
- return -EINVAL;
- if (ops->set_voltage_sel != regulator_set_voltage_sel_regmap)
- return -EOPNOTSUPP;
- return selector;
- }
- EXPORT_SYMBOL_GPL(regulator_list_hardware_vsel);
- /**
- * regulator_get_linear_step - return the voltage step size between VSEL values
- * @regulator: regulator source
- *
- * Returns the voltage step size between VSEL values for linear
- * regulators, or return 0 if the regulator isn't a linear regulator.
- */
- unsigned int regulator_get_linear_step(struct regulator *regulator)
- {
- struct regulator_dev *rdev = regulator->rdev;
- return rdev->desc->uV_step;
- }
- EXPORT_SYMBOL_GPL(regulator_get_linear_step);
- /**
- * regulator_is_supported_voltage - check if a voltage range can be supported
- *
- * @regulator: Regulator to check.
- * @min_uV: Minimum required voltage in uV.
- * @max_uV: Maximum required voltage in uV.
- *
- * Returns a boolean.
- */
- int regulator_is_supported_voltage(struct regulator *regulator,
- int min_uV, int max_uV)
- {
- struct regulator_dev *rdev = regulator->rdev;
- int i, voltages, ret;
- /* If we can't change voltage check the current voltage */
- if (!regulator_ops_is_valid(rdev, REGULATOR_CHANGE_VOLTAGE)) {
- ret = regulator_get_voltage(regulator);
- if (ret >= 0)
- return min_uV <= ret && ret <= max_uV;
- else
- return ret;
- }
- /* Any voltage within constrains range is fine? */
- if (rdev->desc->continuous_voltage_range)
- return min_uV >= rdev->constraints->min_uV &&
- max_uV <= rdev->constraints->max_uV;
- ret = regulator_count_voltages(regulator);
- if (ret < 0)
- return 0;
- voltages = ret;
- for (i = 0; i < voltages; i++) {
- ret = regulator_list_voltage(regulator, i);
- if (ret >= min_uV && ret <= max_uV)
- return 1;
- }
- return 0;
- }
- EXPORT_SYMBOL_GPL(regulator_is_supported_voltage);
- static int regulator_map_voltage(struct regulator_dev *rdev, int min_uV,
- int max_uV)
- {
- const struct regulator_desc *desc = rdev->desc;
- if (desc->ops->map_voltage)
- return desc->ops->map_voltage(rdev, min_uV, max_uV);
- if (desc->ops->list_voltage == regulator_list_voltage_linear)
- return regulator_map_voltage_linear(rdev, min_uV, max_uV);
- if (desc->ops->list_voltage == regulator_list_voltage_linear_range)
- return regulator_map_voltage_linear_range(rdev, min_uV, max_uV);
- if (desc->ops->list_voltage ==
- regulator_list_voltage_pickable_linear_range)
- return regulator_map_voltage_pickable_linear_range(rdev,
- min_uV, max_uV);
- return regulator_map_voltage_iterate(rdev, min_uV, max_uV);
- }
- static int _regulator_call_set_voltage(struct regulator_dev *rdev,
- int min_uV, int max_uV,
- unsigned *selector)
- {
- struct pre_voltage_change_data data;
- int ret;
- data.old_uV = regulator_get_voltage_rdev(rdev);
- data.min_uV = min_uV;
- data.max_uV = max_uV;
- ret = _notifier_call_chain(rdev, REGULATOR_EVENT_PRE_VOLTAGE_CHANGE,
- &data);
- if (ret & NOTIFY_STOP_MASK)
- return -EINVAL;
- ret = rdev->desc->ops->set_voltage(rdev, min_uV, max_uV, selector);
- if (ret >= 0)
- return ret;
- _notifier_call_chain(rdev, REGULATOR_EVENT_ABORT_VOLTAGE_CHANGE,
- (void *)data.old_uV);
- return ret;
- }
- static int _regulator_call_set_voltage_sel(struct regulator_dev *rdev,
- int uV, unsigned selector)
- {
- struct pre_voltage_change_data data;
- int ret;
- data.old_uV = regulator_get_voltage_rdev(rdev);
- data.min_uV = uV;
- data.max_uV = uV;
- ret = _notifier_call_chain(rdev, REGULATOR_EVENT_PRE_VOLTAGE_CHANGE,
- &data);
- if (ret & NOTIFY_STOP_MASK)
- return -EINVAL;
- ret = rdev->desc->ops->set_voltage_sel(rdev, selector);
- if (ret >= 0)
- return ret;
- _notifier_call_chain(rdev, REGULATOR_EVENT_ABORT_VOLTAGE_CHANGE,
- (void *)data.old_uV);
- return ret;
- }
- static int _regulator_set_voltage_sel_step(struct regulator_dev *rdev,
- int uV, int new_selector)
- {
- const struct regulator_ops *ops = rdev->desc->ops;
- int diff, old_sel, curr_sel, ret;
- /* Stepping is only needed if the regulator is enabled. */
- if (!_regulator_is_enabled(rdev))
- goto final_set;
- if (!ops->get_voltage_sel)
- return -EINVAL;
- old_sel = ops->get_voltage_sel(rdev);
- if (old_sel < 0)
- return old_sel;
- diff = new_selector - old_sel;
- if (diff == 0)
- return 0; /* No change needed. */
- if (diff > 0) {
- /* Stepping up. */
- for (curr_sel = old_sel + rdev->desc->vsel_step;
- curr_sel < new_selector;
- curr_sel += rdev->desc->vsel_step) {
- /*
- * Call the callback directly instead of using
- * _regulator_call_set_voltage_sel() as we don't
- * want to notify anyone yet. Same in the branch
- * below.
- */
- ret = ops->set_voltage_sel(rdev, curr_sel);
- if (ret)
- goto try_revert;
- }
- } else {
- /* Stepping down. */
- for (curr_sel = old_sel - rdev->desc->vsel_step;
- curr_sel > new_selector;
- curr_sel -= rdev->desc->vsel_step) {
- ret = ops->set_voltage_sel(rdev, curr_sel);
- if (ret)
- goto try_revert;
- }
- }
- final_set:
- /* The final selector will trigger the notifiers. */
- return _regulator_call_set_voltage_sel(rdev, uV, new_selector);
- try_revert:
- /*
- * At least try to return to the previous voltage if setting a new
- * one failed.
- */
- (void)ops->set_voltage_sel(rdev, old_sel);
- return ret;
- }
- static int _regulator_set_voltage_time(struct regulator_dev *rdev,
- int old_uV, int new_uV)
- {
- unsigned int ramp_delay = 0;
- if (rdev->constraints->ramp_delay)
- ramp_delay = rdev->constraints->ramp_delay;
- else if (rdev->desc->ramp_delay)
- ramp_delay = rdev->desc->ramp_delay;
- else if (rdev->constraints->settling_time)
- return rdev->constraints->settling_time;
- else if (rdev->constraints->settling_time_up &&
- (new_uV > old_uV))
- return rdev->constraints->settling_time_up;
- else if (rdev->constraints->settling_time_down &&
- (new_uV < old_uV))
- return rdev->constraints->settling_time_down;
- if (ramp_delay == 0) {
- rdev_dbg(rdev, "ramp_delay not set\n");
- return 0;
- }
- return DIV_ROUND_UP(abs(new_uV - old_uV), ramp_delay);
- }
- static int _regulator_do_set_voltage(struct regulator_dev *rdev,
- int min_uV, int max_uV)
- {
- int ret;
- int delay = 0;
- int best_val = 0;
- unsigned int selector;
- int old_selector = -1;
- const struct regulator_ops *ops = rdev->desc->ops;
- int old_uV = regulator_get_voltage_rdev(rdev);
- trace_regulator_set_voltage(rdev_get_name(rdev), min_uV, max_uV);
- min_uV += rdev->constraints->uV_offset;
- max_uV += rdev->constraints->uV_offset;
- /*
- * If we can't obtain the old selector there is not enough
- * info to call set_voltage_time_sel().
- */
- if (_regulator_is_enabled(rdev) &&
- ops->set_voltage_time_sel && ops->get_voltage_sel) {
- old_selector = ops->get_voltage_sel(rdev);
- if (old_selector < 0)
- return old_selector;
- }
- if (ops->set_voltage) {
- ret = _regulator_call_set_voltage(rdev, min_uV, max_uV,
- &selector);
- if (ret >= 0) {
- if (ops->list_voltage)
- best_val = ops->list_voltage(rdev,
- selector);
- else
- best_val = regulator_get_voltage_rdev(rdev);
- }
- } else if (ops->set_voltage_sel) {
- ret = regulator_map_voltage(rdev, min_uV, max_uV);
- if (ret >= 0) {
- best_val = ops->list_voltage(rdev, ret);
- if (min_uV <= best_val && max_uV >= best_val) {
- selector = ret;
- if (old_selector == selector)
- ret = 0;
- else if (rdev->desc->vsel_step)
- ret = _regulator_set_voltage_sel_step(
- rdev, best_val, selector);
- else
- ret = _regulator_call_set_voltage_sel(
- rdev, best_val, selector);
- } else {
- ret = -EINVAL;
- }
- }
- } else {
- ret = -EINVAL;
- }
- if (ret)
- goto out;
- if (ops->set_voltage_time_sel) {
- /*
- * Call set_voltage_time_sel if successfully obtained
- * old_selector
- */
- if (old_selector >= 0 && old_selector != selector)
- delay = ops->set_voltage_time_sel(rdev, old_selector,
- selector);
- } else {
- if (old_uV != best_val) {
- if (ops->set_voltage_time)
- delay = ops->set_voltage_time(rdev, old_uV,
- best_val);
- else
- delay = _regulator_set_voltage_time(rdev,
- old_uV,
- best_val);
- }
- }
- if (delay < 0) {
- rdev_warn(rdev, "failed to get delay: %pe\n", ERR_PTR(delay));
- delay = 0;
- }
- /* Insert any necessary delays */
- if (delay >= 1000) {
- mdelay(delay / 1000);
- udelay(delay % 1000);
- } else if (delay) {
- udelay(delay);
- }
- if (best_val >= 0) {
- unsigned long data = best_val;
- _notifier_call_chain(rdev, REGULATOR_EVENT_VOLTAGE_CHANGE,
- (void *)data);
- }
- out:
- trace_regulator_set_voltage_complete(rdev_get_name(rdev), best_val);
- return ret;
- }
- static int _regulator_do_set_suspend_voltage(struct regulator_dev *rdev,
- int min_uV, int max_uV, suspend_state_t state)
- {
- struct regulator_state *rstate;
- int uV, sel;
- rstate = regulator_get_suspend_state(rdev, state);
- if (rstate == NULL)
- return -EINVAL;
- if (min_uV < rstate->min_uV)
- min_uV = rstate->min_uV;
- if (max_uV > rstate->max_uV)
- max_uV = rstate->max_uV;
- sel = regulator_map_voltage(rdev, min_uV, max_uV);
- if (sel < 0)
- return sel;
- uV = rdev->desc->ops->list_voltage(rdev, sel);
- if (uV >= min_uV && uV <= max_uV)
- rstate->uV = uV;
- return 0;
- }
- static int regulator_set_voltage_unlocked(struct regulator *regulator,
- int min_uV, int max_uV,
- suspend_state_t state)
- {
- struct regulator_dev *rdev = regulator->rdev;
- struct regulator_voltage *voltage = ®ulator->voltage[state];
- int ret = 0;
- int old_min_uV, old_max_uV;
- int current_uV;
- /* If we're setting the same range as last time the change
- * should be a noop (some cpufreq implementations use the same
- * voltage for multiple frequencies, for example).
- */
- if (voltage->min_uV == min_uV && voltage->max_uV == max_uV)
- goto out;
- /* If we're trying to set a range that overlaps the current voltage,
- * return successfully even though the regulator does not support
- * changing the voltage.
- */
- if (!regulator_ops_is_valid(rdev, REGULATOR_CHANGE_VOLTAGE)) {
- current_uV = regulator_get_voltage_rdev(rdev);
- if (min_uV <= current_uV && current_uV <= max_uV) {
- voltage->min_uV = min_uV;
- voltage->max_uV = max_uV;
- goto out;
- }
- }
- /* sanity check */
- if (!rdev->desc->ops->set_voltage &&
- !rdev->desc->ops->set_voltage_sel) {
- ret = -EINVAL;
- goto out;
- }
- /* constraints check */
- ret = regulator_check_voltage(rdev, &min_uV, &max_uV);
- if (ret < 0)
- goto out;
- /* restore original values in case of error */
- old_min_uV = voltage->min_uV;
- old_max_uV = voltage->max_uV;
- voltage->min_uV = min_uV;
- voltage->max_uV = max_uV;
- /* for not coupled regulators this will just set the voltage */
- ret = regulator_balance_voltage(rdev, state);
- if (ret < 0) {
- voltage->min_uV = old_min_uV;
- voltage->max_uV = old_max_uV;
- }
- out:
- return ret;
- }
- int regulator_set_voltage_rdev(struct regulator_dev *rdev, int min_uV,
- int max_uV, suspend_state_t state)
- {
- int best_supply_uV = 0;
- int supply_change_uV = 0;
- int ret;
- if (rdev->supply &&
- regulator_ops_is_valid(rdev->supply->rdev,
- REGULATOR_CHANGE_VOLTAGE) &&
- (rdev->desc->min_dropout_uV || !(rdev->desc->ops->get_voltage ||
- rdev->desc->ops->get_voltage_sel))) {
- int current_supply_uV;
- int selector;
- selector = regulator_map_voltage(rdev, min_uV, max_uV);
- if (selector < 0) {
- ret = selector;
- goto out;
- }
- best_supply_uV = _regulator_list_voltage(rdev, selector, 0);
- if (best_supply_uV < 0) {
- ret = best_supply_uV;
- goto out;
- }
- best_supply_uV += rdev->desc->min_dropout_uV;
- current_supply_uV = regulator_get_voltage_rdev(rdev->supply->rdev);
- if (current_supply_uV < 0) {
- ret = current_supply_uV;
- goto out;
- }
- supply_change_uV = best_supply_uV - current_supply_uV;
- }
- if (supply_change_uV > 0) {
- ret = regulator_set_voltage_unlocked(rdev->supply,
- best_supply_uV, INT_MAX, state);
- if (ret) {
- dev_err(&rdev->dev, "Failed to increase supply voltage: %pe\n",
- ERR_PTR(ret));
- goto out;
- }
- }
- if (state == PM_SUSPEND_ON)
- ret = _regulator_do_set_voltage(rdev, min_uV, max_uV);
- else
- ret = _regulator_do_set_suspend_voltage(rdev, min_uV,
- max_uV, state);
- if (ret < 0)
- goto out;
- if (supply_change_uV < 0) {
- ret = regulator_set_voltage_unlocked(rdev->supply,
- best_supply_uV, INT_MAX, state);
- if (ret)
- dev_warn(&rdev->dev, "Failed to decrease supply voltage: %pe\n",
- ERR_PTR(ret));
- /* No need to fail here */
- ret = 0;
- }
- out:
- return ret;
- }
- EXPORT_SYMBOL_GPL(regulator_set_voltage_rdev);
- static int regulator_limit_voltage_step(struct regulator_dev *rdev,
- int *current_uV, int *min_uV)
- {
- struct regulation_constraints *constraints = rdev->constraints;
- /* Limit voltage change only if necessary */
- if (!constraints->max_uV_step || !_regulator_is_enabled(rdev))
- return 1;
- if (*current_uV < 0) {
- *current_uV = regulator_get_voltage_rdev(rdev);
- if (*current_uV < 0)
- return *current_uV;
- }
- if (abs(*current_uV - *min_uV) <= constraints->max_uV_step)
- return 1;
- /* Clamp target voltage within the given step */
- if (*current_uV < *min_uV)
- *min_uV = min(*current_uV + constraints->max_uV_step,
- *min_uV);
- else
- *min_uV = max(*current_uV - constraints->max_uV_step,
- *min_uV);
- return 0;
- }
- static int regulator_get_optimal_voltage(struct regulator_dev *rdev,
- int *current_uV,
- int *min_uV, int *max_uV,
- suspend_state_t state,
- int n_coupled)
- {
- struct coupling_desc *c_desc = &rdev->coupling_desc;
- struct regulator_dev **c_rdevs = c_desc->coupled_rdevs;
- struct regulation_constraints *constraints = rdev->constraints;
- int desired_min_uV = 0, desired_max_uV = INT_MAX;
- int max_current_uV = 0, min_current_uV = INT_MAX;
- int highest_min_uV = 0, target_uV, possible_uV;
- int i, ret, max_spread;
- bool done;
- *current_uV = -1;
- /*
- * If there are no coupled regulators, simply set the voltage
- * demanded by consumers.
- */
- if (n_coupled == 1) {
- /*
- * If consumers don't provide any demands, set voltage
- * to min_uV
- */
- desired_min_uV = constraints->min_uV;
- desired_max_uV = constraints->max_uV;
- ret = regulator_check_consumers(rdev,
- &desired_min_uV,
- &desired_max_uV, state);
- if (ret < 0)
- return ret;
- possible_uV = desired_min_uV;
- done = true;
- goto finish;
- }
- /* Find highest min desired voltage */
- for (i = 0; i < n_coupled; i++) {
- int tmp_min = 0;
- int tmp_max = INT_MAX;
- lockdep_assert_held_once(&c_rdevs[i]->mutex.base);
- ret = regulator_check_consumers(c_rdevs[i],
- &tmp_min,
- &tmp_max, state);
- if (ret < 0)
- return ret;
- ret = regulator_check_voltage(c_rdevs[i], &tmp_min, &tmp_max);
- if (ret < 0)
- return ret;
- highest_min_uV = max(highest_min_uV, tmp_min);
- if (i == 0) {
- desired_min_uV = tmp_min;
- desired_max_uV = tmp_max;
- }
- }
- max_spread = constraints->max_spread[0];
- /*
- * Let target_uV be equal to the desired one if possible.
- * If not, set it to minimum voltage, allowed by other coupled
- * regulators.
- */
- target_uV = max(desired_min_uV, highest_min_uV - max_spread);
- /*
- * Find min and max voltages, which currently aren't violating
- * max_spread.
- */
- for (i = 1; i < n_coupled; i++) {
- int tmp_act;
- if (!_regulator_is_enabled(c_rdevs[i]))
- continue;
- tmp_act = regulator_get_voltage_rdev(c_rdevs[i]);
- if (tmp_act < 0)
- return tmp_act;
- min_current_uV = min(tmp_act, min_current_uV);
- max_current_uV = max(tmp_act, max_current_uV);
- }
- /* There aren't any other regulators enabled */
- if (max_current_uV == 0) {
- possible_uV = target_uV;
- } else {
- /*
- * Correct target voltage, so as it currently isn't
- * violating max_spread
- */
- possible_uV = max(target_uV, max_current_uV - max_spread);
- possible_uV = min(possible_uV, min_current_uV + max_spread);
- }
- if (possible_uV > desired_max_uV)
- return -EINVAL;
- done = (possible_uV == target_uV);
- desired_min_uV = possible_uV;
- finish:
- /* Apply max_uV_step constraint if necessary */
- if (state == PM_SUSPEND_ON) {
- ret = regulator_limit_voltage_step(rdev, current_uV,
- &desired_min_uV);
- if (ret < 0)
- return ret;
- if (ret == 0)
- done = false;
- }
- /* Set current_uV if wasn't done earlier in the code and if necessary */
- if (n_coupled > 1 && *current_uV == -1) {
- if (_regulator_is_enabled(rdev)) {
- ret = regulator_get_voltage_rdev(rdev);
- if (ret < 0)
- return ret;
- *current_uV = ret;
- } else {
- *current_uV = desired_min_uV;
- }
- }
- *min_uV = desired_min_uV;
- *max_uV = desired_max_uV;
- return done;
- }
- int regulator_do_balance_voltage(struct regulator_dev *rdev,
- suspend_state_t state, bool skip_coupled)
- {
- struct regulator_dev **c_rdevs;
- struct regulator_dev *best_rdev;
- struct coupling_desc *c_desc = &rdev->coupling_desc;
- int i, ret, n_coupled, best_min_uV, best_max_uV, best_c_rdev;
- unsigned int delta, best_delta;
- unsigned long c_rdev_done = 0;
- bool best_c_rdev_done;
- c_rdevs = c_desc->coupled_rdevs;
- n_coupled = skip_coupled ? 1 : c_desc->n_coupled;
- /*
- * Find the best possible voltage change on each loop. Leave the loop
- * if there isn't any possible change.
- */
- do {
- best_c_rdev_done = false;
- best_delta = 0;
- best_min_uV = 0;
- best_max_uV = 0;
- best_c_rdev = 0;
- best_rdev = NULL;
- /*
- * Find highest difference between optimal voltage
- * and current voltage.
- */
- for (i = 0; i < n_coupled; i++) {
- /*
- * optimal_uV is the best voltage that can be set for
- * i-th regulator at the moment without violating
- * max_spread constraint in order to balance
- * the coupled voltages.
- */
- int optimal_uV = 0, optimal_max_uV = 0, current_uV = 0;
- if (test_bit(i, &c_rdev_done))
- continue;
- ret = regulator_get_optimal_voltage(c_rdevs[i],
- ¤t_uV,
- &optimal_uV,
- &optimal_max_uV,
- state, n_coupled);
- if (ret < 0)
- goto out;
- delta = abs(optimal_uV - current_uV);
- if (delta && best_delta <= delta) {
- best_c_rdev_done = ret;
- best_delta = delta;
- best_rdev = c_rdevs[i];
- best_min_uV = optimal_uV;
- best_max_uV = optimal_max_uV;
- best_c_rdev = i;
- }
- }
- /* Nothing to change, return successfully */
- if (!best_rdev) {
- ret = 0;
- goto out;
- }
- ret = regulator_set_voltage_rdev(best_rdev, best_min_uV,
- best_max_uV, state);
- if (ret < 0)
- goto out;
- if (best_c_rdev_done)
- set_bit(best_c_rdev, &c_rdev_done);
- } while (n_coupled > 1);
- out:
- return ret;
- }
- static int regulator_balance_voltage(struct regulator_dev *rdev,
- suspend_state_t state)
- {
- struct coupling_desc *c_desc = &rdev->coupling_desc;
- struct regulator_coupler *coupler = c_desc->coupler;
- bool skip_coupled = false;
- /*
- * If system is in a state other than PM_SUSPEND_ON, don't check
- * other coupled regulators.
- */
- if (state != PM_SUSPEND_ON)
- skip_coupled = true;
- if (c_desc->n_resolved < c_desc->n_coupled) {
- rdev_err(rdev, "Not all coupled regulators registered\n");
- return -EPERM;
- }
- /* Invoke custom balancer for customized couplers */
- if (coupler && coupler->balance_voltage)
- return coupler->balance_voltage(coupler, rdev, state);
- return regulator_do_balance_voltage(rdev, state, skip_coupled);
- }
- /**
- * regulator_set_voltage - set regulator output voltage
- * @regulator: regulator source
- * @min_uV: Minimum required voltage in uV
- * @max_uV: Maximum acceptable voltage in uV
- *
- * Sets a voltage regulator to the desired output voltage. This can be set
- * during any regulator state. IOW, regulator can be disabled or enabled.
- *
- * If the regulator is enabled then the voltage will change to the new value
- * immediately otherwise if the regulator is disabled the regulator will
- * output at the new voltage when enabled.
- *
- * NOTE: If the regulator is shared between several devices then the lowest
- * request voltage that meets the system constraints will be used.
- * Regulator system constraints must be set for this regulator before
- * calling this function otherwise this call will fail.
- */
- int regulator_set_voltage(struct regulator *regulator, int min_uV, int max_uV)
- {
- struct ww_acquire_ctx ww_ctx;
- int ret;
- regulator_lock_dependent(regulator->rdev, &ww_ctx);
- ret = regulator_set_voltage_unlocked(regulator, min_uV, max_uV,
- PM_SUSPEND_ON);
- regulator_unlock_dependent(regulator->rdev, &ww_ctx);
- return ret;
- }
- EXPORT_SYMBOL_GPL(regulator_set_voltage);
- static inline int regulator_suspend_toggle(struct regulator_dev *rdev,
- suspend_state_t state, bool en)
- {
- struct regulator_state *rstate;
- rstate = regulator_get_suspend_state(rdev, state);
- if (rstate == NULL)
- return -EINVAL;
- if (!rstate->changeable)
- return -EPERM;
- rstate->enabled = (en) ? ENABLE_IN_SUSPEND : DISABLE_IN_SUSPEND;
- return 0;
- }
- int regulator_suspend_enable(struct regulator_dev *rdev,
- suspend_state_t state)
- {
- return regulator_suspend_toggle(rdev, state, true);
- }
- EXPORT_SYMBOL_GPL(regulator_suspend_enable);
- int regulator_suspend_disable(struct regulator_dev *rdev,
- suspend_state_t state)
- {
- struct regulator *regulator;
- struct regulator_voltage *voltage;
- /*
- * if any consumer wants this regulator device keeping on in
- * suspend states, don't set it as disabled.
- */
- list_for_each_entry(regulator, &rdev->consumer_list, list) {
- voltage = ®ulator->voltage[state];
- if (voltage->min_uV || voltage->max_uV)
- return 0;
- }
- return regulator_suspend_toggle(rdev, state, false);
- }
- EXPORT_SYMBOL_GPL(regulator_suspend_disable);
- static int _regulator_set_suspend_voltage(struct regulator *regulator,
- int min_uV, int max_uV,
- suspend_state_t state)
- {
- struct regulator_dev *rdev = regulator->rdev;
- struct regulator_state *rstate;
- rstate = regulator_get_suspend_state(rdev, state);
- if (rstate == NULL)
- return -EINVAL;
- if (rstate->min_uV == rstate->max_uV) {
- rdev_err(rdev, "The suspend voltage can't be changed!\n");
- return -EPERM;
- }
- return regulator_set_voltage_unlocked(regulator, min_uV, max_uV, state);
- }
- int regulator_set_suspend_voltage(struct regulator *regulator, int min_uV,
- int max_uV, suspend_state_t state)
- {
- struct ww_acquire_ctx ww_ctx;
- int ret;
- /* PM_SUSPEND_ON is handled by regulator_set_voltage() */
- if (regulator_check_states(state) || state == PM_SUSPEND_ON)
- return -EINVAL;
- regulator_lock_dependent(regulator->rdev, &ww_ctx);
- ret = _regulator_set_suspend_voltage(regulator, min_uV,
- max_uV, state);
- regulator_unlock_dependent(regulator->rdev, &ww_ctx);
- return ret;
- }
- EXPORT_SYMBOL_GPL(regulator_set_suspend_voltage);
- /**
- * regulator_set_voltage_time - get raise/fall time
- * @regulator: regulator source
- * @old_uV: starting voltage in microvolts
- * @new_uV: target voltage in microvolts
- *
- * Provided with the starting and ending voltage, this function attempts to
- * calculate the time in microseconds required to rise or fall to this new
- * voltage.
- */
- int regulator_set_voltage_time(struct regulator *regulator,
- int old_uV, int new_uV)
- {
- struct regulator_dev *rdev = regulator->rdev;
- const struct regulator_ops *ops = rdev->desc->ops;
- int old_sel = -1;
- int new_sel = -1;
- int voltage;
- int i;
- if (ops->set_voltage_time)
- return ops->set_voltage_time(rdev, old_uV, new_uV);
- else if (!ops->set_voltage_time_sel)
- return _regulator_set_voltage_time(rdev, old_uV, new_uV);
- /* Currently requires operations to do this */
- if (!ops->list_voltage || !rdev->desc->n_voltages)
- return -EINVAL;
- for (i = 0; i < rdev->desc->n_voltages; i++) {
- /* We only look for exact voltage matches here */
- voltage = regulator_list_voltage(regulator, i);
- if (voltage < 0)
- return -EINVAL;
- if (voltage == 0)
- continue;
- if (voltage == old_uV)
- old_sel = i;
- if (voltage == new_uV)
- new_sel = i;
- }
- if (old_sel < 0 || new_sel < 0)
- return -EINVAL;
- return ops->set_voltage_time_sel(rdev, old_sel, new_sel);
- }
- EXPORT_SYMBOL_GPL(regulator_set_voltage_time);
- /**
- * regulator_set_voltage_time_sel - get raise/fall time
- * @rdev: regulator source device
- * @old_selector: selector for starting voltage
- * @new_selector: selector for target voltage
- *
- * Provided with the starting and target voltage selectors, this function
- * returns time in microseconds required to rise or fall to this new voltage
- *
- * Drivers providing ramp_delay in regulation_constraints can use this as their
- * set_voltage_time_sel() operation.
- */
- int regulator_set_voltage_time_sel(struct regulator_dev *rdev,
- unsigned int old_selector,
- unsigned int new_selector)
- {
- int old_volt, new_volt;
- /* sanity check */
- if (!rdev->desc->ops->list_voltage)
- return -EINVAL;
- old_volt = rdev->desc->ops->list_voltage(rdev, old_selector);
- new_volt = rdev->desc->ops->list_voltage(rdev, new_selector);
- if (rdev->desc->ops->set_voltage_time)
- return rdev->desc->ops->set_voltage_time(rdev, old_volt,
- new_volt);
- else
- return _regulator_set_voltage_time(rdev, old_volt, new_volt);
- }
- EXPORT_SYMBOL_GPL(regulator_set_voltage_time_sel);
- /**
- * regulator_sync_voltage - re-apply last regulator output voltage
- * @regulator: regulator source
- *
- * Re-apply the last configured voltage. This is intended to be used
- * where some external control source the consumer is cooperating with
- * has caused the configured voltage to change.
- */
- int regulator_sync_voltage(struct regulator *regulator)
- {
- struct regulator_dev *rdev = regulator->rdev;
- struct regulator_voltage *voltage = ®ulator->voltage[PM_SUSPEND_ON];
- int ret, min_uV, max_uV;
- regulator_lock(rdev);
- if (!rdev->desc->ops->set_voltage &&
- !rdev->desc->ops->set_voltage_sel) {
- ret = -EINVAL;
- goto out;
- }
- /* This is only going to work if we've had a voltage configured. */
- if (!voltage->min_uV && !voltage->max_uV) {
- ret = -EINVAL;
- goto out;
- }
- min_uV = voltage->min_uV;
- max_uV = voltage->max_uV;
- /* This should be a paranoia check... */
- ret = regulator_check_voltage(rdev, &min_uV, &max_uV);
- if (ret < 0)
- goto out;
- ret = regulator_check_consumers(rdev, &min_uV, &max_uV, 0);
- if (ret < 0)
- goto out;
- ret = _regulator_do_set_voltage(rdev, min_uV, max_uV);
- out:
- regulator_unlock(rdev);
- return ret;
- }
- EXPORT_SYMBOL_GPL(regulator_sync_voltage);
- int regulator_get_voltage_rdev(struct regulator_dev *rdev)
- {
- int sel, ret;
- bool bypassed;
- if (rdev->desc->ops->get_bypass) {
- ret = rdev->desc->ops->get_bypass(rdev, &bypassed);
- if (ret < 0)
- return ret;
- if (bypassed) {
- /* if bypassed the regulator must have a supply */
- if (!rdev->supply) {
- rdev_err(rdev,
- "bypassed regulator has no supply!\n");
- return -EPROBE_DEFER;
- }
- return regulator_get_voltage_rdev(rdev->supply->rdev);
- }
- }
- if (rdev->desc->ops->get_voltage_sel) {
- sel = rdev->desc->ops->get_voltage_sel(rdev);
- if (sel < 0)
- return sel;
- ret = rdev->desc->ops->list_voltage(rdev, sel);
- } else if (rdev->desc->ops->get_voltage) {
- ret = rdev->desc->ops->get_voltage(rdev);
- } else if (rdev->desc->ops->list_voltage) {
- ret = rdev->desc->ops->list_voltage(rdev, 0);
- } else if (rdev->desc->fixed_uV && (rdev->desc->n_voltages == 1)) {
- ret = rdev->desc->fixed_uV;
- } else if (rdev->supply) {
- ret = regulator_get_voltage_rdev(rdev->supply->rdev);
- } else if (rdev->supply_name) {
- return -EPROBE_DEFER;
- } else {
- return -EINVAL;
- }
- if (ret < 0)
- return ret;
- return ret - rdev->constraints->uV_offset;
- }
- EXPORT_SYMBOL_GPL(regulator_get_voltage_rdev);
- /**
- * regulator_get_voltage - get regulator output voltage
- * @regulator: regulator source
- *
- * This returns the current regulator voltage in uV.
- *
- * NOTE: If the regulator is disabled it will return the voltage value. This
- * function should not be used to determine regulator state.
- */
- int regulator_get_voltage(struct regulator *regulator)
- {
- struct ww_acquire_ctx ww_ctx;
- int ret;
- regulator_lock_dependent(regulator->rdev, &ww_ctx);
- ret = regulator_get_voltage_rdev(regulator->rdev);
- regulator_unlock_dependent(regulator->rdev, &ww_ctx);
- return ret;
- }
- EXPORT_SYMBOL_GPL(regulator_get_voltage);
- /**
- * regulator_set_current_limit - set regulator output current limit
- * @regulator: regulator source
- * @min_uA: Minimum supported current in uA
- * @max_uA: Maximum supported current in uA
- *
- * Sets current sink to the desired output current. This can be set during
- * any regulator state. IOW, regulator can be disabled or enabled.
- *
- * If the regulator is enabled then the current will change to the new value
- * immediately otherwise if the regulator is disabled the regulator will
- * output at the new current when enabled.
- *
- * NOTE: Regulator system constraints must be set for this regulator before
- * calling this function otherwise this call will fail.
- */
- int regulator_set_current_limit(struct regulator *regulator,
- int min_uA, int max_uA)
- {
- struct regulator_dev *rdev = regulator->rdev;
- int ret;
- regulator_lock(rdev);
- /* sanity check */
- if (!rdev->desc->ops->set_current_limit) {
- ret = -EINVAL;
- goto out;
- }
- /* constraints check */
- ret = regulator_check_current_limit(rdev, &min_uA, &max_uA);
- if (ret < 0)
- goto out;
- ret = rdev->desc->ops->set_current_limit(rdev, min_uA, max_uA);
- out:
- regulator_unlock(rdev);
- return ret;
- }
- EXPORT_SYMBOL_GPL(regulator_set_current_limit);
- static int _regulator_get_current_limit_unlocked(struct regulator_dev *rdev)
- {
- /* sanity check */
- if (!rdev->desc->ops->get_current_limit)
- return -EINVAL;
- return rdev->desc->ops->get_current_limit(rdev);
- }
- static int _regulator_get_current_limit(struct regulator_dev *rdev)
- {
- int ret;
- regulator_lock(rdev);
- ret = _regulator_get_current_limit_unlocked(rdev);
- regulator_unlock(rdev);
- return ret;
- }
- /**
- * regulator_get_current_limit - get regulator output current
- * @regulator: regulator source
- *
- * This returns the current supplied by the specified current sink in uA.
- *
- * NOTE: If the regulator is disabled it will return the current value. This
- * function should not be used to determine regulator state.
- */
- int regulator_get_current_limit(struct regulator *regulator)
- {
- return _regulator_get_current_limit(regulator->rdev);
- }
- EXPORT_SYMBOL_GPL(regulator_get_current_limit);
- /**
- * regulator_set_mode - set regulator operating mode
- * @regulator: regulator source
- * @mode: operating mode - one of the REGULATOR_MODE constants
- *
- * Set regulator operating mode to increase regulator efficiency or improve
- * regulation performance.
- *
- * NOTE: Regulator system constraints must be set for this regulator before
- * calling this function otherwise this call will fail.
- */
- int regulator_set_mode(struct regulator *regulator, unsigned int mode)
- {
- struct regulator_dev *rdev = regulator->rdev;
- int ret;
- int regulator_curr_mode;
- regulator_lock(rdev);
- /* sanity check */
- if (!rdev->desc->ops->set_mode) {
- ret = -EINVAL;
- goto out;
- }
- /* return if the same mode is requested */
- if (rdev->desc->ops->get_mode) {
- regulator_curr_mode = rdev->desc->ops->get_mode(rdev);
- if (regulator_curr_mode == mode) {
- ret = 0;
- goto out;
- }
- }
- /* constraints check */
- ret = regulator_mode_constrain(rdev, &mode);
- if (ret < 0)
- goto out;
- ret = rdev->desc->ops->set_mode(rdev, mode);
- out:
- regulator_unlock(rdev);
- return ret;
- }
- EXPORT_SYMBOL_GPL(regulator_set_mode);
- static unsigned int _regulator_get_mode_unlocked(struct regulator_dev *rdev)
- {
- /* sanity check */
- if (!rdev->desc->ops->get_mode)
- return -EINVAL;
- return rdev->desc->ops->get_mode(rdev);
- }
- static unsigned int _regulator_get_mode(struct regulator_dev *rdev)
- {
- int ret;
- regulator_lock(rdev);
- ret = _regulator_get_mode_unlocked(rdev);
- regulator_unlock(rdev);
- return ret;
- }
- /**
- * regulator_get_mode - get regulator operating mode
- * @regulator: regulator source
- *
- * Get the current regulator operating mode.
- */
- unsigned int regulator_get_mode(struct regulator *regulator)
- {
- return _regulator_get_mode(regulator->rdev);
- }
- EXPORT_SYMBOL_GPL(regulator_get_mode);
- static int _regulator_get_error_flags(struct regulator_dev *rdev,
- unsigned int *flags)
- {
- int ret;
- regulator_lock(rdev);
- /* sanity check */
- if (!rdev->desc->ops->get_error_flags) {
- ret = -EINVAL;
- goto out;
- }
- ret = rdev->desc->ops->get_error_flags(rdev, flags);
- out:
- regulator_unlock(rdev);
- return ret;
- }
- /**
- * regulator_get_error_flags - get regulator error information
- * @regulator: regulator source
- * @flags: pointer to store error flags
- *
- * Get the current regulator error information.
- */
- int regulator_get_error_flags(struct regulator *regulator,
- unsigned int *flags)
- {
- return _regulator_get_error_flags(regulator->rdev, flags);
- }
- EXPORT_SYMBOL_GPL(regulator_get_error_flags);
- /**
- * regulator_set_load - set regulator load
- * @regulator: regulator source
- * @uA_load: load current
- *
- * Notifies the regulator core of a new device load. This is then used by
- * DRMS (if enabled by constraints) to set the most efficient regulator
- * operating mode for the new regulator loading.
- *
- * Consumer devices notify their supply regulator of the maximum power
- * they will require (can be taken from device datasheet in the power
- * consumption tables) when they change operational status and hence power
- * state. Examples of operational state changes that can affect power
- * consumption are :-
- *
- * o Device is opened / closed.
- * o Device I/O is about to begin or has just finished.
- * o Device is idling in between work.
- *
- * This information is also exported via sysfs to userspace.
- *
- * DRMS will sum the total requested load on the regulator and change
- * to the most efficient operating mode if platform constraints allow.
- *
- * NOTE: when a regulator consumer requests to have a regulator
- * disabled then any load that consumer requested no longer counts
- * toward the total requested load. If the regulator is re-enabled
- * then the previously requested load will start counting again.
- *
- * If a regulator is an always-on regulator then an individual consumer's
- * load will still be removed if that consumer is fully disabled.
- *
- * On error a negative errno is returned.
- */
- int regulator_set_load(struct regulator *regulator, int uA_load)
- {
- struct regulator_dev *rdev = regulator->rdev;
- int old_uA_load;
- int ret = 0;
- regulator_lock(rdev);
- old_uA_load = regulator->uA_load;
- regulator->uA_load = uA_load;
- if (regulator->enable_count && old_uA_load != uA_load) {
- ret = drms_uA_update(rdev);
- if (ret < 0)
- regulator->uA_load = old_uA_load;
- }
- regulator_unlock(rdev);
- return ret;
- }
- EXPORT_SYMBOL_GPL(regulator_set_load);
- /**
- * regulator_allow_bypass - allow the regulator to go into bypass mode
- *
- * @regulator: Regulator to configure
- * @enable: enable or disable bypass mode
- *
- * Allow the regulator to go into bypass mode if all other consumers
- * for the regulator also enable bypass mode and the machine
- * constraints allow this. Bypass mode means that the regulator is
- * simply passing the input directly to the output with no regulation.
- */
- int regulator_allow_bypass(struct regulator *regulator, bool enable)
- {
- struct regulator_dev *rdev = regulator->rdev;
- const char *name = rdev_get_name(rdev);
- int ret = 0;
- if (!rdev->desc->ops->set_bypass)
- return 0;
- if (!regulator_ops_is_valid(rdev, REGULATOR_CHANGE_BYPASS))
- return 0;
- regulator_lock(rdev);
- if (enable && !regulator->bypass) {
- rdev->bypass_count++;
- if (rdev->bypass_count == rdev->open_count) {
- trace_regulator_bypass_enable(name);
- ret = rdev->desc->ops->set_bypass(rdev, enable);
- if (ret != 0)
- rdev->bypass_count--;
- else
- trace_regulator_bypass_enable_complete(name);
- }
- } else if (!enable && regulator->bypass) {
- rdev->bypass_count--;
- if (rdev->bypass_count != rdev->open_count) {
- trace_regulator_bypass_disable(name);
- ret = rdev->desc->ops->set_bypass(rdev, enable);
- if (ret != 0)
- rdev->bypass_count++;
- else
- trace_regulator_bypass_disable_complete(name);
- }
- }
- if (ret == 0)
- regulator->bypass = enable;
- regulator_unlock(rdev);
- return ret;
- }
- EXPORT_SYMBOL_GPL(regulator_allow_bypass);
- /**
- * regulator_register_notifier - register regulator event notifier
- * @regulator: regulator source
- * @nb: notifier block
- *
- * Register notifier block to receive regulator events.
- */
- int regulator_register_notifier(struct regulator *regulator,
- struct notifier_block *nb)
- {
- return blocking_notifier_chain_register(®ulator->rdev->notifier,
- nb);
- }
- EXPORT_SYMBOL_GPL(regulator_register_notifier);
- /**
- * regulator_unregister_notifier - unregister regulator event notifier
- * @regulator: regulator source
- * @nb: notifier block
- *
- * Unregister regulator event notifier block.
- */
- int regulator_unregister_notifier(struct regulator *regulator,
- struct notifier_block *nb)
- {
- return blocking_notifier_chain_unregister(®ulator->rdev->notifier,
- nb);
- }
- EXPORT_SYMBOL_GPL(regulator_unregister_notifier);
- /* notify regulator consumers and downstream regulator consumers.
- * Note mutex must be held by caller.
- */
- static int _notifier_call_chain(struct regulator_dev *rdev,
- unsigned long event, void *data)
- {
- /* call rdev chain first */
- return blocking_notifier_call_chain(&rdev->notifier, event, data);
- }
- /**
- * regulator_bulk_get - get multiple regulator consumers
- *
- * @dev: Device to supply
- * @num_consumers: Number of consumers to register
- * @consumers: Configuration of consumers; clients are stored here.
- *
- * @return 0 on success, an errno on failure.
- *
- * This helper function allows drivers to get several regulator
- * consumers in one operation. If any of the regulators cannot be
- * acquired then any regulators that were allocated will be freed
- * before returning to the caller.
- */
- int regulator_bulk_get(struct device *dev, int num_consumers,
- struct regulator_bulk_data *consumers)
- {
- int i;
- int ret;
- for (i = 0; i < num_consumers; i++)
- consumers[i].consumer = NULL;
- for (i = 0; i < num_consumers; i++) {
- consumers[i].consumer = regulator_get(dev,
- consumers[i].supply);
- if (IS_ERR(consumers[i].consumer)) {
- ret = PTR_ERR(consumers[i].consumer);
- consumers[i].consumer = NULL;
- goto err;
- }
- }
- return 0;
- err:
- if (ret != -EPROBE_DEFER)
- dev_err(dev, "Failed to get supply '%s': %pe\n",
- consumers[i].supply, ERR_PTR(ret));
- else
- dev_dbg(dev, "Failed to get supply '%s', deferring\n",
- consumers[i].supply);
- while (--i >= 0)
- regulator_put(consumers[i].consumer);
- return ret;
- }
- EXPORT_SYMBOL_GPL(regulator_bulk_get);
- static void regulator_bulk_enable_async(void *data, async_cookie_t cookie)
- {
- struct regulator_bulk_data *bulk = data;
- bulk->ret = regulator_enable(bulk->consumer);
- }
- /**
- * regulator_bulk_enable - enable multiple regulator consumers
- *
- * @num_consumers: Number of consumers
- * @consumers: Consumer data; clients are stored here.
- * @return 0 on success, an errno on failure
- *
- * This convenience API allows consumers to enable multiple regulator
- * clients in a single API call. If any consumers cannot be enabled
- * then any others that were enabled will be disabled again prior to
- * return.
- */
- int regulator_bulk_enable(int num_consumers,
- struct regulator_bulk_data *consumers)
- {
- ASYNC_DOMAIN_EXCLUSIVE(async_domain);
- int i;
- int ret = 0;
- for (i = 0; i < num_consumers; i++) {
- async_schedule_domain(regulator_bulk_enable_async,
- &consumers[i], &async_domain);
- }
- async_synchronize_full_domain(&async_domain);
- /* If any consumer failed we need to unwind any that succeeded */
- for (i = 0; i < num_consumers; i++) {
- if (consumers[i].ret != 0) {
- ret = consumers[i].ret;
- goto err;
- }
- }
- return 0;
- err:
- for (i = 0; i < num_consumers; i++) {
- if (consumers[i].ret < 0)
- pr_err("Failed to enable %s: %pe\n", consumers[i].supply,
- ERR_PTR(consumers[i].ret));
- else
- regulator_disable(consumers[i].consumer);
- }
- return ret;
- }
- EXPORT_SYMBOL_GPL(regulator_bulk_enable);
- /**
- * regulator_bulk_disable - disable multiple regulator consumers
- *
- * @num_consumers: Number of consumers
- * @consumers: Consumer data; clients are stored here.
- * @return 0 on success, an errno on failure
- *
- * This convenience API allows consumers to disable multiple regulator
- * clients in a single API call. If any consumers cannot be disabled
- * then any others that were disabled will be enabled again prior to
- * return.
- */
- int regulator_bulk_disable(int num_consumers,
- struct regulator_bulk_data *consumers)
- {
- int i;
- int ret, r;
- for (i = num_consumers - 1; i >= 0; --i) {
- ret = regulator_disable(consumers[i].consumer);
- if (ret != 0)
- goto err;
- }
- return 0;
- err:
- pr_err("Failed to disable %s: %pe\n", consumers[i].supply, ERR_PTR(ret));
- for (++i; i < num_consumers; ++i) {
- r = regulator_enable(consumers[i].consumer);
- if (r != 0)
- pr_err("Failed to re-enable %s: %pe\n",
- consumers[i].supply, ERR_PTR(r));
- }
- return ret;
- }
- EXPORT_SYMBOL_GPL(regulator_bulk_disable);
- /**
- * regulator_bulk_force_disable - force disable multiple regulator consumers
- *
- * @num_consumers: Number of consumers
- * @consumers: Consumer data; clients are stored here.
- * @return 0 on success, an errno on failure
- *
- * This convenience API allows consumers to forcibly disable multiple regulator
- * clients in a single API call.
- * NOTE: This should be used for situations when device damage will
- * likely occur if the regulators are not disabled (e.g. over temp).
- * Although regulator_force_disable function call for some consumers can
- * return error numbers, the function is called for all consumers.
- */
- int regulator_bulk_force_disable(int num_consumers,
- struct regulator_bulk_data *consumers)
- {
- int i;
- int ret = 0;
- for (i = 0; i < num_consumers; i++) {
- consumers[i].ret =
- regulator_force_disable(consumers[i].consumer);
- /* Store first error for reporting */
- if (consumers[i].ret && !ret)
- ret = consumers[i].ret;
- }
- return ret;
- }
- EXPORT_SYMBOL_GPL(regulator_bulk_force_disable);
- /**
- * regulator_bulk_free - free multiple regulator consumers
- *
- * @num_consumers: Number of consumers
- * @consumers: Consumer data; clients are stored here.
- *
- * This convenience API allows consumers to free multiple regulator
- * clients in a single API call.
- */
- void regulator_bulk_free(int num_consumers,
- struct regulator_bulk_data *consumers)
- {
- int i;
- for (i = 0; i < num_consumers; i++) {
- regulator_put(consumers[i].consumer);
- consumers[i].consumer = NULL;
- }
- }
- EXPORT_SYMBOL_GPL(regulator_bulk_free);
- /**
- * regulator_notifier_call_chain - call regulator event notifier
- * @rdev: regulator source
- * @event: notifier block
- * @data: callback-specific data.
- *
- * Called by regulator drivers to notify clients a regulator event has
- * occurred.
- */
- int regulator_notifier_call_chain(struct regulator_dev *rdev,
- unsigned long event, void *data)
- {
- _notifier_call_chain(rdev, event, data);
- return NOTIFY_DONE;
- }
- EXPORT_SYMBOL_GPL(regulator_notifier_call_chain);
- /**
- * regulator_mode_to_status - convert a regulator mode into a status
- *
- * @mode: Mode to convert
- *
- * Convert a regulator mode into a status.
- */
- int regulator_mode_to_status(unsigned int mode)
- {
- switch (mode) {
- case REGULATOR_MODE_FAST:
- return REGULATOR_STATUS_FAST;
- case REGULATOR_MODE_NORMAL:
- return REGULATOR_STATUS_NORMAL;
- case REGULATOR_MODE_IDLE:
- return REGULATOR_STATUS_IDLE;
- case REGULATOR_MODE_STANDBY:
- return REGULATOR_STATUS_STANDBY;
- default:
- return REGULATOR_STATUS_UNDEFINED;
- }
- }
- EXPORT_SYMBOL_GPL(regulator_mode_to_status);
- static struct attribute *regulator_dev_attrs[] = {
- &dev_attr_name.attr,
- &dev_attr_num_users.attr,
- &dev_attr_type.attr,
- &dev_attr_microvolts.attr,
- &dev_attr_microamps.attr,
- &dev_attr_opmode.attr,
- &dev_attr_state.attr,
- &dev_attr_status.attr,
- &dev_attr_bypass.attr,
- &dev_attr_requested_microamps.attr,
- &dev_attr_min_microvolts.attr,
- &dev_attr_max_microvolts.attr,
- &dev_attr_min_microamps.attr,
- &dev_attr_max_microamps.attr,
- &dev_attr_suspend_standby_state.attr,
- &dev_attr_suspend_mem_state.attr,
- &dev_attr_suspend_disk_state.attr,
- &dev_attr_suspend_standby_microvolts.attr,
- &dev_attr_suspend_mem_microvolts.attr,
- &dev_attr_suspend_disk_microvolts.attr,
- &dev_attr_suspend_standby_mode.attr,
- &dev_attr_suspend_mem_mode.attr,
- &dev_attr_suspend_disk_mode.attr,
- NULL
- };
- /*
- * To avoid cluttering sysfs (and memory) with useless state, only
- * create attributes that can be meaningfully displayed.
- */
- static umode_t regulator_attr_is_visible(struct kobject *kobj,
- struct attribute *attr, int idx)
- {
- struct device *dev = kobj_to_dev(kobj);
- struct regulator_dev *rdev = dev_to_rdev(dev);
- const struct regulator_ops *ops = rdev->desc->ops;
- umode_t mode = attr->mode;
- /* these three are always present */
- if (attr == &dev_attr_name.attr ||
- attr == &dev_attr_num_users.attr ||
- attr == &dev_attr_type.attr)
- return mode;
- /* some attributes need specific methods to be displayed */
- if (attr == &dev_attr_microvolts.attr) {
- if ((ops->get_voltage && ops->get_voltage(rdev) >= 0) ||
- (ops->get_voltage_sel && ops->get_voltage_sel(rdev) >= 0) ||
- (ops->list_voltage && ops->list_voltage(rdev, 0) >= 0) ||
- (rdev->desc->fixed_uV && rdev->desc->n_voltages == 1))
- return mode;
- return 0;
- }
- if (attr == &dev_attr_microamps.attr)
- return ops->get_current_limit ? mode : 0;
- if (attr == &dev_attr_opmode.attr)
- return ops->get_mode ? mode : 0;
- if (attr == &dev_attr_state.attr)
- return (rdev->ena_pin || ops->is_enabled) ? mode : 0;
- if (attr == &dev_attr_status.attr)
- return ops->get_status ? mode : 0;
- if (attr == &dev_attr_bypass.attr)
- return ops->get_bypass ? mode : 0;
- /* constraints need specific supporting methods */
- if (attr == &dev_attr_min_microvolts.attr ||
- attr == &dev_attr_max_microvolts.attr)
- return (ops->set_voltage || ops->set_voltage_sel) ? mode : 0;
- if (attr == &dev_attr_min_microamps.attr ||
- attr == &dev_attr_max_microamps.attr)
- return ops->set_current_limit ? mode : 0;
- if (attr == &dev_attr_suspend_standby_state.attr ||
- attr == &dev_attr_suspend_mem_state.attr ||
- attr == &dev_attr_suspend_disk_state.attr)
- return mode;
- if (attr == &dev_attr_suspend_standby_microvolts.attr ||
- attr == &dev_attr_suspend_mem_microvolts.attr ||
- attr == &dev_attr_suspend_disk_microvolts.attr)
- return ops->set_suspend_voltage ? mode : 0;
- if (attr == &dev_attr_suspend_standby_mode.attr ||
- attr == &dev_attr_suspend_mem_mode.attr ||
- attr == &dev_attr_suspend_disk_mode.attr)
- return ops->set_suspend_mode ? mode : 0;
- return mode;
- }
- static const struct attribute_group regulator_dev_group = {
- .attrs = regulator_dev_attrs,
- .is_visible = regulator_attr_is_visible,
- };
- static const struct attribute_group *regulator_dev_groups[] = {
- ®ulator_dev_group,
- NULL
- };
- static void regulator_dev_release(struct device *dev)
- {
- struct regulator_dev *rdev = dev_get_drvdata(dev);
- kfree(rdev->constraints);
- of_node_put(rdev->dev.of_node);
- kfree(rdev);
- }
- static void rdev_init_debugfs(struct regulator_dev *rdev)
- {
- struct device *parent = rdev->dev.parent;
- const char *rname = rdev_get_name(rdev);
- char name[NAME_MAX];
- /* Avoid duplicate debugfs directory names */
- if (parent && rname == rdev->desc->name) {
- snprintf(name, sizeof(name), "%s-%s", dev_name(parent),
- rname);
- rname = name;
- }
- rdev->debugfs = debugfs_create_dir(rname, debugfs_root);
- if (!rdev->debugfs) {
- rdev_warn(rdev, "Failed to create debugfs directory\n");
- return;
- }
- debugfs_create_u32("use_count", 0444, rdev->debugfs,
- &rdev->use_count);
- debugfs_create_u32("open_count", 0444, rdev->debugfs,
- &rdev->open_count);
- debugfs_create_u32("bypass_count", 0444, rdev->debugfs,
- &rdev->bypass_count);
- }
- static int regulator_register_resolve_supply(struct device *dev, void *data)
- {
- struct regulator_dev *rdev = dev_to_rdev(dev);
- if (regulator_resolve_supply(rdev))
- rdev_dbg(rdev, "unable to resolve supply\n");
- return 0;
- }
- int regulator_coupler_register(struct regulator_coupler *coupler)
- {
- mutex_lock(®ulator_list_mutex);
- list_add_tail(&coupler->list, ®ulator_coupler_list);
- mutex_unlock(®ulator_list_mutex);
- return 0;
- }
- static struct regulator_coupler *
- regulator_find_coupler(struct regulator_dev *rdev)
- {
- struct regulator_coupler *coupler;
- int err;
- /*
- * Note that regulators are appended to the list and the generic
- * coupler is registered first, hence it will be attached at last
- * if nobody cared.
- */
- list_for_each_entry_reverse(coupler, ®ulator_coupler_list, list) {
- err = coupler->attach_regulator(coupler, rdev);
- if (!err) {
- if (!coupler->balance_voltage &&
- rdev->coupling_desc.n_coupled > 2)
- goto err_unsupported;
- return coupler;
- }
- if (err < 0)
- return ERR_PTR(err);
- if (err == 1)
- continue;
- break;
- }
- return ERR_PTR(-EINVAL);
- err_unsupported:
- if (coupler->detach_regulator)
- coupler->detach_regulator(coupler, rdev);
- rdev_err(rdev,
- "Voltage balancing for multiple regulator couples is unimplemented\n");
- return ERR_PTR(-EPERM);
- }
- static void regulator_resolve_coupling(struct regulator_dev *rdev)
- {
- struct regulator_coupler *coupler = rdev->coupling_desc.coupler;
- struct coupling_desc *c_desc = &rdev->coupling_desc;
- int n_coupled = c_desc->n_coupled;
- struct regulator_dev *c_rdev;
- int i;
- for (i = 1; i < n_coupled; i++) {
- /* already resolved */
- if (c_desc->coupled_rdevs[i])
- continue;
- c_rdev = of_parse_coupled_regulator(rdev, i - 1);
- if (!c_rdev)
- continue;
- if (c_rdev->coupling_desc.coupler != coupler) {
- rdev_err(rdev, "coupler mismatch with %s\n",
- rdev_get_name(c_rdev));
- return;
- }
- c_desc->coupled_rdevs[i] = c_rdev;
- c_desc->n_resolved++;
- regulator_resolve_coupling(c_rdev);
- }
- }
- static void regulator_remove_coupling(struct regulator_dev *rdev)
- {
- struct regulator_coupler *coupler = rdev->coupling_desc.coupler;
- struct coupling_desc *__c_desc, *c_desc = &rdev->coupling_desc;
- struct regulator_dev *__c_rdev, *c_rdev;
- unsigned int __n_coupled, n_coupled;
- int i, k;
- int err;
- n_coupled = c_desc->n_coupled;
- for (i = 1; i < n_coupled; i++) {
- c_rdev = c_desc->coupled_rdevs[i];
- if (!c_rdev)
- continue;
- regulator_lock(c_rdev);
- __c_desc = &c_rdev->coupling_desc;
- __n_coupled = __c_desc->n_coupled;
- for (k = 1; k < __n_coupled; k++) {
- __c_rdev = __c_desc->coupled_rdevs[k];
- if (__c_rdev == rdev) {
- __c_desc->coupled_rdevs[k] = NULL;
- __c_desc->n_resolved--;
- break;
- }
- }
- regulator_unlock(c_rdev);
- c_desc->coupled_rdevs[i] = NULL;
- c_desc->n_resolved--;
- }
- if (coupler && coupler->detach_regulator) {
- err = coupler->detach_regulator(coupler, rdev);
- if (err)
- rdev_err(rdev, "failed to detach from coupler: %pe\n",
- ERR_PTR(err));
- }
- kfree(rdev->coupling_desc.coupled_rdevs);
- rdev->coupling_desc.coupled_rdevs = NULL;
- }
- static int regulator_init_coupling(struct regulator_dev *rdev)
- {
- struct regulator_dev **coupled;
- int err, n_phandles;
- if (!IS_ENABLED(CONFIG_OF))
- n_phandles = 0;
- else
- n_phandles = of_get_n_coupled(rdev);
- coupled = kcalloc(n_phandles + 1, sizeof(*coupled), GFP_KERNEL);
- if (!coupled)
- return -ENOMEM;
- rdev->coupling_desc.coupled_rdevs = coupled;
- /*
- * Every regulator should always have coupling descriptor filled with
- * at least pointer to itself.
- */
- rdev->coupling_desc.coupled_rdevs[0] = rdev;
- rdev->coupling_desc.n_coupled = n_phandles + 1;
- rdev->coupling_desc.n_resolved++;
- /* regulator isn't coupled */
- if (n_phandles == 0)
- return 0;
- if (!of_check_coupling_data(rdev))
- return -EPERM;
- mutex_lock(®ulator_list_mutex);
- rdev->coupling_desc.coupler = regulator_find_coupler(rdev);
- mutex_unlock(®ulator_list_mutex);
- if (IS_ERR(rdev->coupling_desc.coupler)) {
- err = PTR_ERR(rdev->coupling_desc.coupler);
- rdev_err(rdev, "failed to get coupler: %pe\n", ERR_PTR(err));
- return err;
- }
- return 0;
- }
- static int generic_coupler_attach(struct regulator_coupler *coupler,
- struct regulator_dev *rdev)
- {
- if (rdev->coupling_desc.n_coupled > 2) {
- rdev_err(rdev,
- "Voltage balancing for multiple regulator couples is unimplemented\n");
- return -EPERM;
- }
- if (!rdev->constraints->always_on) {
- rdev_err(rdev,
- "Coupling of a non always-on regulator is unimplemented\n");
- return -ENOTSUPP;
- }
- return 0;
- }
- static struct regulator_coupler generic_regulator_coupler = {
- .attach_regulator = generic_coupler_attach,
- };
- /**
- * regulator_register - register regulator
- * @regulator_desc: regulator to register
- * @cfg: runtime configuration for regulator
- *
- * Called by regulator drivers to register a regulator.
- * Returns a valid pointer to struct regulator_dev on success
- * or an ERR_PTR() on error.
- */
- struct regulator_dev *
- regulator_register(const struct regulator_desc *regulator_desc,
- const struct regulator_config *cfg)
- {
- const struct regulator_init_data *init_data;
- struct regulator_config *config = NULL;
- static atomic_t regulator_no = ATOMIC_INIT(-1);
- struct regulator_dev *rdev;
- bool dangling_cfg_gpiod = false;
- bool dangling_of_gpiod = false;
- struct device *dev;
- int ret, i;
- if (cfg == NULL)
- return ERR_PTR(-EINVAL);
- if (cfg->ena_gpiod)
- dangling_cfg_gpiod = true;
- if (regulator_desc == NULL) {
- ret = -EINVAL;
- goto rinse;
- }
- dev = cfg->dev;
- WARN_ON(!dev);
- if (regulator_desc->name == NULL || regulator_desc->ops == NULL) {
- ret = -EINVAL;
- goto rinse;
- }
- if (regulator_desc->type != REGULATOR_VOLTAGE &&
- regulator_desc->type != REGULATOR_CURRENT) {
- ret = -EINVAL;
- goto rinse;
- }
- /* Only one of each should be implemented */
- WARN_ON(regulator_desc->ops->get_voltage &&
- regulator_desc->ops->get_voltage_sel);
- WARN_ON(regulator_desc->ops->set_voltage &&
- regulator_desc->ops->set_voltage_sel);
- /* If we're using selectors we must implement list_voltage. */
- if (regulator_desc->ops->get_voltage_sel &&
- !regulator_desc->ops->list_voltage) {
- ret = -EINVAL;
- goto rinse;
- }
- if (regulator_desc->ops->set_voltage_sel &&
- !regulator_desc->ops->list_voltage) {
- ret = -EINVAL;
- goto rinse;
- }
- rdev = kzalloc(sizeof(struct regulator_dev), GFP_KERNEL);
- if (rdev == NULL) {
- ret = -ENOMEM;
- goto rinse;
- }
- device_initialize(&rdev->dev);
- /*
- * Duplicate the config so the driver could override it after
- * parsing init data.
- */
- config = kmemdup(cfg, sizeof(*cfg), GFP_KERNEL);
- if (config == NULL) {
- ret = -ENOMEM;
- goto clean;
- }
- init_data = regulator_of_get_init_data(dev, regulator_desc, config,
- &rdev->dev.of_node);
- /*
- * Sometimes not all resources are probed already so we need to take
- * that into account. This happens most the time if the ena_gpiod comes
- * from a gpio extender or something else.
- */
- if (PTR_ERR(init_data) == -EPROBE_DEFER) {
- ret = -EPROBE_DEFER;
- goto clean;
- }
- /*
- * We need to keep track of any GPIO descriptor coming from the
- * device tree until we have handled it over to the core. If the
- * config that was passed in to this function DOES NOT contain
- * a descriptor, and the config after this call DOES contain
- * a descriptor, we definitely got one from parsing the device
- * tree.
- */
- if (!cfg->ena_gpiod && config->ena_gpiod)
- dangling_of_gpiod = true;
- if (!init_data) {
- init_data = config->init_data;
- rdev->dev.of_node = of_node_get(config->of_node);
- }
- ww_mutex_init(&rdev->mutex, ®ulator_ww_class);
- rdev->reg_data = config->driver_data;
- rdev->owner = regulator_desc->owner;
- rdev->desc = regulator_desc;
- if (config->regmap)
- rdev->regmap = config->regmap;
- else if (dev_get_regmap(dev, NULL))
- rdev->regmap = dev_get_regmap(dev, NULL);
- else if (dev->parent)
- rdev->regmap = dev_get_regmap(dev->parent, NULL);
- INIT_LIST_HEAD(&rdev->consumer_list);
- INIT_LIST_HEAD(&rdev->list);
- BLOCKING_INIT_NOTIFIER_HEAD(&rdev->notifier);
- INIT_DELAYED_WORK(&rdev->disable_work, regulator_disable_work);
- /* preform any regulator specific init */
- if (init_data && init_data->regulator_init) {
- ret = init_data->regulator_init(rdev->reg_data);
- if (ret < 0)
- goto clean;
- }
- if (config->ena_gpiod) {
- ret = regulator_ena_gpio_request(rdev, config);
- if (ret != 0) {
- rdev_err(rdev, "Failed to request enable GPIO: %pe\n",
- ERR_PTR(ret));
- goto clean;
- }
- /* The regulator core took over the GPIO descriptor */
- dangling_cfg_gpiod = false;
- dangling_of_gpiod = false;
- }
- /* register with sysfs */
- rdev->dev.class = ®ulator_class;
- rdev->dev.parent = dev;
- dev_set_name(&rdev->dev, "regulator.%lu",
- (unsigned long) atomic_inc_return(®ulator_no));
- dev_set_drvdata(&rdev->dev, rdev);
- /* set regulator constraints */
- if (init_data)
- rdev->constraints = kmemdup(&init_data->constraints,
- sizeof(*rdev->constraints),
- GFP_KERNEL);
- else
- rdev->constraints = kzalloc(sizeof(*rdev->constraints),
- GFP_KERNEL);
- if (!rdev->constraints) {
- ret = -ENOMEM;
- goto wash;
- }
- if (init_data && init_data->supply_regulator)
- rdev->supply_name = init_data->supply_regulator;
- else if (regulator_desc->supply_name)
- rdev->supply_name = regulator_desc->supply_name;
- ret = set_machine_constraints(rdev);
- if (ret == -EPROBE_DEFER) {
- /* Regulator might be in bypass mode and so needs its supply
- * to set the constraints */
- /* FIXME: this currently triggers a chicken-and-egg problem
- * when creating -SUPPLY symlink in sysfs to a regulator
- * that is just being created */
- ret = regulator_resolve_supply(rdev);
- if (!ret)
- ret = set_machine_constraints(rdev);
- else
- rdev_dbg(rdev, "unable to resolve supply early: %pe\n",
- ERR_PTR(ret));
- }
- if (ret < 0)
- goto wash;
- ret = regulator_init_coupling(rdev);
- if (ret < 0)
- goto wash;
- /* add consumers devices */
- if (init_data) {
- for (i = 0; i < init_data->num_consumer_supplies; i++) {
- ret = set_consumer_device_supply(rdev,
- init_data->consumer_supplies[i].dev_name,
- init_data->consumer_supplies[i].supply);
- if (ret < 0) {
- dev_err(dev, "Failed to set supply %s\n",
- init_data->consumer_supplies[i].supply);
- goto unset_supplies;
- }
- }
- }
- if (!rdev->desc->ops->get_voltage &&
- !rdev->desc->ops->list_voltage &&
- !rdev->desc->fixed_uV)
- rdev->is_switch = true;
- ret = device_add(&rdev->dev);
- if (ret != 0)
- goto unset_supplies;
- rdev_init_debugfs(rdev);
- /* try to resolve regulators coupling since a new one was registered */
- mutex_lock(®ulator_list_mutex);
- regulator_resolve_coupling(rdev);
- mutex_unlock(®ulator_list_mutex);
- /* try to resolve regulators supply since a new one was registered */
- class_for_each_device(®ulator_class, NULL, NULL,
- regulator_register_resolve_supply);
- kfree(config);
- return rdev;
- unset_supplies:
- mutex_lock(®ulator_list_mutex);
- unset_regulator_supplies(rdev);
- regulator_remove_coupling(rdev);
- mutex_unlock(®ulator_list_mutex);
- wash:
- kfree(rdev->coupling_desc.coupled_rdevs);
- mutex_lock(®ulator_list_mutex);
- regulator_ena_gpio_free(rdev);
- mutex_unlock(®ulator_list_mutex);
- clean:
- if (dangling_of_gpiod)
- gpiod_put(config->ena_gpiod);
- kfree(config);
- put_device(&rdev->dev);
- rinse:
- if (dangling_cfg_gpiod)
- gpiod_put(cfg->ena_gpiod);
- return ERR_PTR(ret);
- }
- EXPORT_SYMBOL_GPL(regulator_register);
- /**
- * regulator_unregister - unregister regulator
- * @rdev: regulator to unregister
- *
- * Called by regulator drivers to unregister a regulator.
- */
- void regulator_unregister(struct regulator_dev *rdev)
- {
- if (rdev == NULL)
- return;
- if (rdev->supply) {
- while (rdev->use_count--)
- regulator_disable(rdev->supply);
- regulator_put(rdev->supply);
- }
- flush_work(&rdev->disable_work.work);
- mutex_lock(®ulator_list_mutex);
- debugfs_remove_recursive(rdev->debugfs);
- WARN_ON(rdev->open_count);
- regulator_remove_coupling(rdev);
- unset_regulator_supplies(rdev);
- list_del(&rdev->list);
- regulator_ena_gpio_free(rdev);
- device_unregister(&rdev->dev);
- mutex_unlock(®ulator_list_mutex);
- }
- EXPORT_SYMBOL_GPL(regulator_unregister);
- #ifdef CONFIG_SUSPEND
- /**
- * regulator_suspend - prepare regulators for system wide suspend
- * @dev: ``&struct device`` pointer that is passed to _regulator_suspend()
- *
- * Configure each regulator with it's suspend operating parameters for state.
- */
- static int regulator_suspend(struct device *dev)
- {
- struct regulator_dev *rdev = dev_to_rdev(dev);
- suspend_state_t state = pm_suspend_target_state;
- int ret;
- const struct regulator_state *rstate;
- rstate = regulator_get_suspend_state_check(rdev, state);
- if (!rstate)
- return 0;
- regulator_lock(rdev);
- ret = __suspend_set_state(rdev, rstate);
- regulator_unlock(rdev);
- return ret;
- }
- static int regulator_resume(struct device *dev)
- {
- suspend_state_t state = pm_suspend_target_state;
- struct regulator_dev *rdev = dev_to_rdev(dev);
- struct regulator_state *rstate;
- int ret = 0;
- rstate = regulator_get_suspend_state(rdev, state);
- if (rstate == NULL)
- return 0;
- /* Avoid grabbing the lock if we don't need to */
- if (!rdev->desc->ops->resume)
- return 0;
- regulator_lock(rdev);
- if (rstate->enabled == ENABLE_IN_SUSPEND ||
- rstate->enabled == DISABLE_IN_SUSPEND)
- ret = rdev->desc->ops->resume(rdev);
- regulator_unlock(rdev);
- return ret;
- }
- #else /* !CONFIG_SUSPEND */
- #define regulator_suspend NULL
- #define regulator_resume NULL
- #endif /* !CONFIG_SUSPEND */
- #ifdef CONFIG_PM
- static const struct dev_pm_ops __maybe_unused regulator_pm_ops = {
- .suspend = regulator_suspend,
- .resume = regulator_resume,
- };
- #endif
- struct class regulator_class = {
- .name = "regulator",
- .dev_release = regulator_dev_release,
- .dev_groups = regulator_dev_groups,
- #ifdef CONFIG_PM
- .pm = ®ulator_pm_ops,
- #endif
- };
- /**
- * regulator_has_full_constraints - the system has fully specified constraints
- *
- * Calling this function will cause the regulator API to disable all
- * regulators which have a zero use count and don't have an always_on
- * constraint in a late_initcall.
- *
- * The intention is that this will become the default behaviour in a
- * future kernel release so users are encouraged to use this facility
- * now.
- */
- void regulator_has_full_constraints(void)
- {
- has_full_constraints = 1;
- }
- EXPORT_SYMBOL_GPL(regulator_has_full_constraints);
- /**
- * rdev_get_drvdata - get rdev regulator driver data
- * @rdev: regulator
- *
- * Get rdev regulator driver private data. This call can be used in the
- * regulator driver context.
- */
- void *rdev_get_drvdata(struct regulator_dev *rdev)
- {
- return rdev->reg_data;
- }
- EXPORT_SYMBOL_GPL(rdev_get_drvdata);
- /**
- * regulator_get_drvdata - get regulator driver data
- * @regulator: regulator
- *
- * Get regulator driver private data. This call can be used in the consumer
- * driver context when non API regulator specific functions need to be called.
- */
- void *regulator_get_drvdata(struct regulator *regulator)
- {
- return regulator->rdev->reg_data;
- }
- EXPORT_SYMBOL_GPL(regulator_get_drvdata);
- /**
- * regulator_set_drvdata - set regulator driver data
- * @regulator: regulator
- * @data: data
- */
- void regulator_set_drvdata(struct regulator *regulator, void *data)
- {
- regulator->rdev->reg_data = data;
- }
- EXPORT_SYMBOL_GPL(regulator_set_drvdata);
- /**
- * regulator_get_id - get regulator ID
- * @rdev: regulator
- */
- int rdev_get_id(struct regulator_dev *rdev)
- {
- return rdev->desc->id;
- }
- EXPORT_SYMBOL_GPL(rdev_get_id);
- struct device *rdev_get_dev(struct regulator_dev *rdev)
- {
- return &rdev->dev;
- }
- EXPORT_SYMBOL_GPL(rdev_get_dev);
- struct regmap *rdev_get_regmap(struct regulator_dev *rdev)
- {
- return rdev->regmap;
- }
- EXPORT_SYMBOL_GPL(rdev_get_regmap);
- void *regulator_get_init_drvdata(struct regulator_init_data *reg_init_data)
- {
- return reg_init_data->driver_data;
- }
- EXPORT_SYMBOL_GPL(regulator_get_init_drvdata);
- #ifdef CONFIG_DEBUG_FS
- static int supply_map_show(struct seq_file *sf, void *data)
- {
- struct regulator_map *map;
- list_for_each_entry(map, ®ulator_map_list, list) {
- seq_printf(sf, "%s -> %s.%s\n",
- rdev_get_name(map->regulator), map->dev_name,
- map->supply);
- }
- return 0;
- }
- DEFINE_SHOW_ATTRIBUTE(supply_map);
- struct summary_data {
- struct seq_file *s;
- struct regulator_dev *parent;
- int level;
- };
- static void regulator_summary_show_subtree(struct seq_file *s,
- struct regulator_dev *rdev,
- int level);
- static int regulator_summary_show_children(struct device *dev, void *data)
- {
- struct regulator_dev *rdev = dev_to_rdev(dev);
- struct summary_data *summary_data = data;
- if (rdev->supply && rdev->supply->rdev == summary_data->parent)
- regulator_summary_show_subtree(summary_data->s, rdev,
- summary_data->level + 1);
- return 0;
- }
- static void regulator_summary_show_subtree(struct seq_file *s,
- struct regulator_dev *rdev,
- int level)
- {
- struct regulation_constraints *c;
- struct regulator *consumer;
- struct summary_data summary_data;
- unsigned int opmode;
- if (!rdev)
- return;
- opmode = _regulator_get_mode_unlocked(rdev);
- seq_printf(s, "%*s%-*s %3d %4d %6d %7s ",
- level * 3 + 1, "",
- 30 - level * 3, rdev_get_name(rdev),
- rdev->use_count, rdev->open_count, rdev->bypass_count,
- regulator_opmode_to_str(opmode));
- seq_printf(s, "%5dmV ", regulator_get_voltage_rdev(rdev) / 1000);
- seq_printf(s, "%5dmA ",
- _regulator_get_current_limit_unlocked(rdev) / 1000);
- c = rdev->constraints;
- if (c) {
- switch (rdev->desc->type) {
- case REGULATOR_VOLTAGE:
- seq_printf(s, "%5dmV %5dmV ",
- c->min_uV / 1000, c->max_uV / 1000);
- break;
- case REGULATOR_CURRENT:
- seq_printf(s, "%5dmA %5dmA ",
- c->min_uA / 1000, c->max_uA / 1000);
- break;
- }
- }
- seq_puts(s, "\n");
- list_for_each_entry(consumer, &rdev->consumer_list, list) {
- if (consumer->dev && consumer->dev->class == ®ulator_class)
- continue;
- seq_printf(s, "%*s%-*s ",
- (level + 1) * 3 + 1, "",
- 30 - (level + 1) * 3,
- consumer->supply_name ? consumer->supply_name :
- consumer->dev ? dev_name(consumer->dev) : "deviceless");
- switch (rdev->desc->type) {
- case REGULATOR_VOLTAGE:
- seq_printf(s, "%3d %33dmA%c%5dmV %5dmV",
- consumer->enable_count,
- consumer->uA_load / 1000,
- consumer->uA_load && !consumer->enable_count ?
- '*' : ' ',
- consumer->voltage[PM_SUSPEND_ON].min_uV / 1000,
- consumer->voltage[PM_SUSPEND_ON].max_uV / 1000);
- break;
- case REGULATOR_CURRENT:
- break;
- }
- seq_puts(s, "\n");
- }
- summary_data.s = s;
- summary_data.level = level;
- summary_data.parent = rdev;
- class_for_each_device(®ulator_class, NULL, &summary_data,
- regulator_summary_show_children);
- }
- struct summary_lock_data {
- struct ww_acquire_ctx *ww_ctx;
- struct regulator_dev **new_contended_rdev;
- struct regulator_dev **old_contended_rdev;
- };
- static int regulator_summary_lock_one(struct device *dev, void *data)
- {
- struct regulator_dev *rdev = dev_to_rdev(dev);
- struct summary_lock_data *lock_data = data;
- int ret = 0;
- if (rdev != *lock_data->old_contended_rdev) {
- ret = regulator_lock_nested(rdev, lock_data->ww_ctx);
- if (ret == -EDEADLK)
- *lock_data->new_contended_rdev = rdev;
- else
- WARN_ON_ONCE(ret);
- } else {
- *lock_data->old_contended_rdev = NULL;
- }
- return ret;
- }
- static int regulator_summary_unlock_one(struct device *dev, void *data)
- {
- struct regulator_dev *rdev = dev_to_rdev(dev);
- struct summary_lock_data *lock_data = data;
- if (lock_data) {
- if (rdev == *lock_data->new_contended_rdev)
- return -EDEADLK;
- }
- regulator_unlock(rdev);
- return 0;
- }
- static int regulator_summary_lock_all(struct ww_acquire_ctx *ww_ctx,
- struct regulator_dev **new_contended_rdev,
- struct regulator_dev **old_contended_rdev)
- {
- struct summary_lock_data lock_data;
- int ret;
- lock_data.ww_ctx = ww_ctx;
- lock_data.new_contended_rdev = new_contended_rdev;
- lock_data.old_contended_rdev = old_contended_rdev;
- ret = class_for_each_device(®ulator_class, NULL, &lock_data,
- regulator_summary_lock_one);
- if (ret)
- class_for_each_device(®ulator_class, NULL, &lock_data,
- regulator_summary_unlock_one);
- return ret;
- }
- static void regulator_summary_lock(struct ww_acquire_ctx *ww_ctx)
- {
- struct regulator_dev *new_contended_rdev = NULL;
- struct regulator_dev *old_contended_rdev = NULL;
- int err;
- mutex_lock(®ulator_list_mutex);
- ww_acquire_init(ww_ctx, ®ulator_ww_class);
- do {
- if (new_contended_rdev) {
- ww_mutex_lock_slow(&new_contended_rdev->mutex, ww_ctx);
- old_contended_rdev = new_contended_rdev;
- old_contended_rdev->ref_cnt++;
- }
- err = regulator_summary_lock_all(ww_ctx,
- &new_contended_rdev,
- &old_contended_rdev);
- if (old_contended_rdev)
- regulator_unlock(old_contended_rdev);
- } while (err == -EDEADLK);
- ww_acquire_done(ww_ctx);
- }
- static void regulator_summary_unlock(struct ww_acquire_ctx *ww_ctx)
- {
- class_for_each_device(®ulator_class, NULL, NULL,
- regulator_summary_unlock_one);
- ww_acquire_fini(ww_ctx);
- mutex_unlock(®ulator_list_mutex);
- }
- static int regulator_summary_show_roots(struct device *dev, void *data)
- {
- struct regulator_dev *rdev = dev_to_rdev(dev);
- struct seq_file *s = data;
- if (!rdev->supply)
- regulator_summary_show_subtree(s, rdev, 0);
- return 0;
- }
- static int regulator_summary_show(struct seq_file *s, void *data)
- {
- struct ww_acquire_ctx ww_ctx;
- seq_puts(s, " regulator use open bypass opmode voltage current min max\n");
- seq_puts(s, "---------------------------------------------------------------------------------------\n");
- regulator_summary_lock(&ww_ctx);
- class_for_each_device(®ulator_class, NULL, s,
- regulator_summary_show_roots);
- regulator_summary_unlock(&ww_ctx);
- return 0;
- }
- DEFINE_SHOW_ATTRIBUTE(regulator_summary);
- #endif /* CONFIG_DEBUG_FS */
- static int __init regulator_init(void)
- {
- int ret;
- ret = class_register(®ulator_class);
- debugfs_root = debugfs_create_dir("regulator", NULL);
- if (!debugfs_root)
- pr_warn("regulator: Failed to create debugfs directory\n");
- #ifdef CONFIG_DEBUG_FS
- debugfs_create_file("supply_map", 0444, debugfs_root, NULL,
- &supply_map_fops);
- debugfs_create_file("regulator_summary", 0444, debugfs_root,
- NULL, ®ulator_summary_fops);
- #endif
- regulator_dummy_init();
- regulator_coupler_register(&generic_regulator_coupler);
- return ret;
- }
- /* init early to allow our consumers to complete system booting */
- core_initcall(regulator_init);
- static int regulator_late_cleanup(struct device *dev, void *data)
- {
- struct regulator_dev *rdev = dev_to_rdev(dev);
- struct regulation_constraints *c = rdev->constraints;
- int ret;
- if (c && c->always_on)
- return 0;
- if (!regulator_ops_is_valid(rdev, REGULATOR_CHANGE_STATUS))
- return 0;
- regulator_lock(rdev);
- if (rdev->use_count)
- goto unlock;
- /* If reading the status failed, assume that it's off. */
- if (_regulator_is_enabled(rdev) <= 0)
- goto unlock;
- if (have_full_constraints()) {
- /* We log since this may kill the system if it goes
- * wrong. */
- rdev_info(rdev, "disabling\n");
- ret = _regulator_do_disable(rdev);
- if (ret != 0)
- rdev_err(rdev, "couldn't disable: %pe\n", ERR_PTR(ret));
- } else {
- /* The intention is that in future we will
- * assume that full constraints are provided
- * so warn even if we aren't going to do
- * anything here.
- */
- rdev_warn(rdev, "incomplete constraints, leaving on\n");
- }
- unlock:
- regulator_unlock(rdev);
- return 0;
- }
- static void regulator_init_complete_work_function(struct work_struct *work)
- {
- /*
- * Regulators may had failed to resolve their input supplies
- * when were registered, either because the input supply was
- * not registered yet or because its parent device was not
- * bound yet. So attempt to resolve the input supplies for
- * pending regulators before trying to disable unused ones.
- */
- class_for_each_device(®ulator_class, NULL, NULL,
- regulator_register_resolve_supply);
- /* If we have a full configuration then disable any regulators
- * we have permission to change the status for and which are
- * not in use or always_on. This is effectively the default
- * for DT and ACPI as they have full constraints.
- */
- class_for_each_device(®ulator_class, NULL, NULL,
- regulator_late_cleanup);
- }
- static DECLARE_DELAYED_WORK(regulator_init_complete_work,
- regulator_init_complete_work_function);
- static int __init regulator_init_complete(void)
- {
- /*
- * Since DT doesn't provide an idiomatic mechanism for
- * enabling full constraints and since it's much more natural
- * with DT to provide them just assume that a DT enabled
- * system has full constraints.
- */
- if (of_have_populated_dt())
- has_full_constraints = true;
- /*
- * We punt completion for an arbitrary amount of time since
- * systems like distros will load many drivers from userspace
- * so consumers might not always be ready yet, this is
- * particularly an issue with laptops where this might bounce
- * the display off then on. Ideally we'd get a notification
- * from userspace when this happens but we don't so just wait
- * a bit and hope we waited long enough. It'd be better if
- * we'd only do this on systems that need it, and a kernel
- * command line option might be useful.
- */
- schedule_delayed_work(®ulator_init_complete_work,
- msecs_to_jiffies(30000));
- return 0;
- }
- late_initcall_sync(regulator_init_complete);
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