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- // SPDX-License-Identifier: GPL-2.0-or-later
- /*
- * drivers/acpi/power.c - ACPI Power Resources management.
- *
- * Copyright (C) 2001 - 2015 Intel Corp.
- * Author: Andy Grover <andrew.grover@intel.com>
- * Author: Paul Diefenbaugh <paul.s.diefenbaugh@intel.com>
- * Author: Rafael J. Wysocki <rafael.j.wysocki@intel.com>
- */
- /*
- * ACPI power-managed devices may be controlled in two ways:
- * 1. via "Device Specific (D-State) Control"
- * 2. via "Power Resource Control".
- * The code below deals with ACPI Power Resources control.
- *
- * An ACPI "power resource object" represents a software controllable power
- * plane, clock plane, or other resource depended on by a device.
- *
- * A device may rely on multiple power resources, and a power resource
- * may be shared by multiple devices.
- */
- #include <linux/kernel.h>
- #include <linux/module.h>
- #include <linux/init.h>
- #include <linux/types.h>
- #include <linux/slab.h>
- #include <linux/pm_runtime.h>
- #include <linux/sysfs.h>
- #include <linux/acpi.h>
- #include "sleep.h"
- #include "internal.h"
- #define _COMPONENT ACPI_POWER_COMPONENT
- ACPI_MODULE_NAME("power");
- #define ACPI_POWER_CLASS "power_resource"
- #define ACPI_POWER_DEVICE_NAME "Power Resource"
- #define ACPI_POWER_RESOURCE_STATE_OFF 0x00
- #define ACPI_POWER_RESOURCE_STATE_ON 0x01
- #define ACPI_POWER_RESOURCE_STATE_UNKNOWN 0xFF
- struct acpi_power_dependent_device {
- struct device *dev;
- struct list_head node;
- };
- struct acpi_power_resource {
- struct acpi_device device;
- struct list_head list_node;
- char *name;
- u32 system_level;
- u32 order;
- unsigned int ref_count;
- bool wakeup_enabled;
- struct mutex resource_lock;
- struct list_head dependents;
- };
- struct acpi_power_resource_entry {
- struct list_head node;
- struct acpi_power_resource *resource;
- };
- static LIST_HEAD(acpi_power_resource_list);
- static DEFINE_MUTEX(power_resource_list_lock);
- /* --------------------------------------------------------------------------
- Power Resource Management
- -------------------------------------------------------------------------- */
- static inline
- struct acpi_power_resource *to_power_resource(struct acpi_device *device)
- {
- return container_of(device, struct acpi_power_resource, device);
- }
- static struct acpi_power_resource *acpi_power_get_context(acpi_handle handle)
- {
- struct acpi_device *device;
- if (acpi_bus_get_device(handle, &device))
- return NULL;
- return to_power_resource(device);
- }
- static int acpi_power_resources_list_add(acpi_handle handle,
- struct list_head *list)
- {
- struct acpi_power_resource *resource = acpi_power_get_context(handle);
- struct acpi_power_resource_entry *entry;
- if (!resource || !list)
- return -EINVAL;
- entry = kzalloc(sizeof(*entry), GFP_KERNEL);
- if (!entry)
- return -ENOMEM;
- entry->resource = resource;
- if (!list_empty(list)) {
- struct acpi_power_resource_entry *e;
- list_for_each_entry(e, list, node)
- if (e->resource->order > resource->order) {
- list_add_tail(&entry->node, &e->node);
- return 0;
- }
- }
- list_add_tail(&entry->node, list);
- return 0;
- }
- void acpi_power_resources_list_free(struct list_head *list)
- {
- struct acpi_power_resource_entry *entry, *e;
- list_for_each_entry_safe(entry, e, list, node) {
- list_del(&entry->node);
- kfree(entry);
- }
- }
- static bool acpi_power_resource_is_dup(union acpi_object *package,
- unsigned int start, unsigned int i)
- {
- acpi_handle rhandle, dup;
- unsigned int j;
- /* The caller is expected to check the package element types */
- rhandle = package->package.elements[i].reference.handle;
- for (j = start; j < i; j++) {
- dup = package->package.elements[j].reference.handle;
- if (dup == rhandle)
- return true;
- }
- return false;
- }
- int acpi_extract_power_resources(union acpi_object *package, unsigned int start,
- struct list_head *list)
- {
- unsigned int i;
- int err = 0;
- for (i = start; i < package->package.count; i++) {
- union acpi_object *element = &package->package.elements[i];
- acpi_handle rhandle;
- if (element->type != ACPI_TYPE_LOCAL_REFERENCE) {
- err = -ENODATA;
- break;
- }
- rhandle = element->reference.handle;
- if (!rhandle) {
- err = -ENODEV;
- break;
- }
- /* Some ACPI tables contain duplicate power resource references */
- if (acpi_power_resource_is_dup(package, start, i))
- continue;
- err = acpi_add_power_resource(rhandle);
- if (err)
- break;
- err = acpi_power_resources_list_add(rhandle, list);
- if (err)
- break;
- }
- if (err)
- acpi_power_resources_list_free(list);
- return err;
- }
- static int acpi_power_get_state(acpi_handle handle, int *state)
- {
- acpi_status status = AE_OK;
- unsigned long long sta = 0;
- char node_name[5];
- struct acpi_buffer buffer = { sizeof(node_name), node_name };
- if (!handle || !state)
- return -EINVAL;
- status = acpi_evaluate_integer(handle, "_STA", NULL, &sta);
- if (ACPI_FAILURE(status))
- return -ENODEV;
- *state = (sta & 0x01)?ACPI_POWER_RESOURCE_STATE_ON:
- ACPI_POWER_RESOURCE_STATE_OFF;
- acpi_get_name(handle, ACPI_SINGLE_NAME, &buffer);
- ACPI_DEBUG_PRINT((ACPI_DB_INFO, "Resource [%s] is %s\n",
- node_name,
- *state ? "on" : "off"));
- return 0;
- }
- static int acpi_power_get_list_state(struct list_head *list, int *state)
- {
- struct acpi_power_resource_entry *entry;
- int cur_state;
- if (!list || !state)
- return -EINVAL;
- /* The state of the list is 'on' IFF all resources are 'on'. */
- cur_state = 0;
- list_for_each_entry(entry, list, node) {
- struct acpi_power_resource *resource = entry->resource;
- acpi_handle handle = resource->device.handle;
- int result;
- mutex_lock(&resource->resource_lock);
- result = acpi_power_get_state(handle, &cur_state);
- mutex_unlock(&resource->resource_lock);
- if (result)
- return result;
- if (cur_state != ACPI_POWER_RESOURCE_STATE_ON)
- break;
- }
- ACPI_DEBUG_PRINT((ACPI_DB_INFO, "Resource list is %s\n",
- cur_state ? "on" : "off"));
- *state = cur_state;
- return 0;
- }
- static int
- acpi_power_resource_add_dependent(struct acpi_power_resource *resource,
- struct device *dev)
- {
- struct acpi_power_dependent_device *dep;
- int ret = 0;
- mutex_lock(&resource->resource_lock);
- list_for_each_entry(dep, &resource->dependents, node) {
- /* Only add it once */
- if (dep->dev == dev)
- goto unlock;
- }
- dep = kzalloc(sizeof(*dep), GFP_KERNEL);
- if (!dep) {
- ret = -ENOMEM;
- goto unlock;
- }
- dep->dev = dev;
- list_add_tail(&dep->node, &resource->dependents);
- dev_dbg(dev, "added power dependency to [%s]\n", resource->name);
- unlock:
- mutex_unlock(&resource->resource_lock);
- return ret;
- }
- static void
- acpi_power_resource_remove_dependent(struct acpi_power_resource *resource,
- struct device *dev)
- {
- struct acpi_power_dependent_device *dep;
- mutex_lock(&resource->resource_lock);
- list_for_each_entry(dep, &resource->dependents, node) {
- if (dep->dev == dev) {
- list_del(&dep->node);
- kfree(dep);
- dev_dbg(dev, "removed power dependency to [%s]\n",
- resource->name);
- break;
- }
- }
- mutex_unlock(&resource->resource_lock);
- }
- /**
- * acpi_device_power_add_dependent - Add dependent device of this ACPI device
- * @adev: ACPI device pointer
- * @dev: Dependent device
- *
- * If @adev has non-empty _PR0 the @dev is added as dependent device to all
- * power resources returned by it. This means that whenever these power
- * resources are turned _ON the dependent devices get runtime resumed. This
- * is needed for devices such as PCI to allow its driver to re-initialize
- * it after it went to D0uninitialized.
- *
- * If @adev does not have _PR0 this does nothing.
- *
- * Returns %0 in case of success and negative errno otherwise.
- */
- int acpi_device_power_add_dependent(struct acpi_device *adev,
- struct device *dev)
- {
- struct acpi_power_resource_entry *entry;
- struct list_head *resources;
- int ret;
- if (!adev->flags.power_manageable)
- return 0;
- resources = &adev->power.states[ACPI_STATE_D0].resources;
- list_for_each_entry(entry, resources, node) {
- ret = acpi_power_resource_add_dependent(entry->resource, dev);
- if (ret)
- goto err;
- }
- return 0;
- err:
- list_for_each_entry(entry, resources, node)
- acpi_power_resource_remove_dependent(entry->resource, dev);
- return ret;
- }
- /**
- * acpi_device_power_remove_dependent - Remove dependent device
- * @adev: ACPI device pointer
- * @dev: Dependent device
- *
- * Does the opposite of acpi_device_power_add_dependent() and removes the
- * dependent device if it is found. Can be called to @adev that does not
- * have _PR0 as well.
- */
- void acpi_device_power_remove_dependent(struct acpi_device *adev,
- struct device *dev)
- {
- struct acpi_power_resource_entry *entry;
- struct list_head *resources;
- if (!adev->flags.power_manageable)
- return;
- resources = &adev->power.states[ACPI_STATE_D0].resources;
- list_for_each_entry_reverse(entry, resources, node)
- acpi_power_resource_remove_dependent(entry->resource, dev);
- }
- static int __acpi_power_on(struct acpi_power_resource *resource)
- {
- struct acpi_power_dependent_device *dep;
- acpi_status status = AE_OK;
- status = acpi_evaluate_object(resource->device.handle, "_ON", NULL, NULL);
- if (ACPI_FAILURE(status))
- return -ENODEV;
- ACPI_DEBUG_PRINT((ACPI_DB_INFO, "Power resource [%s] turned on\n",
- resource->name));
- /*
- * If there are other dependents on this power resource we need to
- * resume them now so that their drivers can re-initialize the
- * hardware properly after it went back to D0.
- */
- if (list_empty(&resource->dependents) ||
- list_is_singular(&resource->dependents))
- return 0;
- list_for_each_entry(dep, &resource->dependents, node) {
- dev_dbg(dep->dev, "runtime resuming because [%s] turned on\n",
- resource->name);
- pm_request_resume(dep->dev);
- }
- return 0;
- }
- static int acpi_power_on_unlocked(struct acpi_power_resource *resource)
- {
- int result = 0;
- if (resource->ref_count++) {
- ACPI_DEBUG_PRINT((ACPI_DB_INFO,
- "Power resource [%s] already on\n",
- resource->name));
- } else {
- result = __acpi_power_on(resource);
- if (result)
- resource->ref_count--;
- }
- return result;
- }
- static int acpi_power_on(struct acpi_power_resource *resource)
- {
- int result;
- mutex_lock(&resource->resource_lock);
- result = acpi_power_on_unlocked(resource);
- mutex_unlock(&resource->resource_lock);
- return result;
- }
- static int __acpi_power_off(struct acpi_power_resource *resource)
- {
- acpi_status status;
- status = acpi_evaluate_object(resource->device.handle, "_OFF",
- NULL, NULL);
- if (ACPI_FAILURE(status))
- return -ENODEV;
- ACPI_DEBUG_PRINT((ACPI_DB_INFO, "Power resource [%s] turned off\n",
- resource->name));
- return 0;
- }
- static int acpi_power_off_unlocked(struct acpi_power_resource *resource)
- {
- int result = 0;
- if (!resource->ref_count) {
- ACPI_DEBUG_PRINT((ACPI_DB_INFO,
- "Power resource [%s] already off\n",
- resource->name));
- return 0;
- }
- if (--resource->ref_count) {
- ACPI_DEBUG_PRINT((ACPI_DB_INFO,
- "Power resource [%s] still in use\n",
- resource->name));
- } else {
- result = __acpi_power_off(resource);
- if (result)
- resource->ref_count++;
- }
- return result;
- }
- static int acpi_power_off(struct acpi_power_resource *resource)
- {
- int result;
- mutex_lock(&resource->resource_lock);
- result = acpi_power_off_unlocked(resource);
- mutex_unlock(&resource->resource_lock);
- return result;
- }
- static int acpi_power_off_list(struct list_head *list)
- {
- struct acpi_power_resource_entry *entry;
- int result = 0;
- list_for_each_entry_reverse(entry, list, node) {
- result = acpi_power_off(entry->resource);
- if (result)
- goto err;
- }
- return 0;
- err:
- list_for_each_entry_continue(entry, list, node)
- acpi_power_on(entry->resource);
- return result;
- }
- static int acpi_power_on_list(struct list_head *list)
- {
- struct acpi_power_resource_entry *entry;
- int result = 0;
- list_for_each_entry(entry, list, node) {
- result = acpi_power_on(entry->resource);
- if (result)
- goto err;
- }
- return 0;
- err:
- list_for_each_entry_continue_reverse(entry, list, node)
- acpi_power_off(entry->resource);
- return result;
- }
- static struct attribute *attrs[] = {
- NULL,
- };
- static const struct attribute_group attr_groups[] = {
- [ACPI_STATE_D0] = {
- .name = "power_resources_D0",
- .attrs = attrs,
- },
- [ACPI_STATE_D1] = {
- .name = "power_resources_D1",
- .attrs = attrs,
- },
- [ACPI_STATE_D2] = {
- .name = "power_resources_D2",
- .attrs = attrs,
- },
- [ACPI_STATE_D3_HOT] = {
- .name = "power_resources_D3hot",
- .attrs = attrs,
- },
- };
- static const struct attribute_group wakeup_attr_group = {
- .name = "power_resources_wakeup",
- .attrs = attrs,
- };
- static void acpi_power_hide_list(struct acpi_device *adev,
- struct list_head *resources,
- const struct attribute_group *attr_group)
- {
- struct acpi_power_resource_entry *entry;
- if (list_empty(resources))
- return;
- list_for_each_entry_reverse(entry, resources, node) {
- struct acpi_device *res_dev = &entry->resource->device;
- sysfs_remove_link_from_group(&adev->dev.kobj,
- attr_group->name,
- dev_name(&res_dev->dev));
- }
- sysfs_remove_group(&adev->dev.kobj, attr_group);
- }
- static void acpi_power_expose_list(struct acpi_device *adev,
- struct list_head *resources,
- const struct attribute_group *attr_group)
- {
- struct acpi_power_resource_entry *entry;
- int ret;
- if (list_empty(resources))
- return;
- ret = sysfs_create_group(&adev->dev.kobj, attr_group);
- if (ret)
- return;
- list_for_each_entry(entry, resources, node) {
- struct acpi_device *res_dev = &entry->resource->device;
- ret = sysfs_add_link_to_group(&adev->dev.kobj,
- attr_group->name,
- &res_dev->dev.kobj,
- dev_name(&res_dev->dev));
- if (ret) {
- acpi_power_hide_list(adev, resources, attr_group);
- break;
- }
- }
- }
- static void acpi_power_expose_hide(struct acpi_device *adev,
- struct list_head *resources,
- const struct attribute_group *attr_group,
- bool expose)
- {
- if (expose)
- acpi_power_expose_list(adev, resources, attr_group);
- else
- acpi_power_hide_list(adev, resources, attr_group);
- }
- void acpi_power_add_remove_device(struct acpi_device *adev, bool add)
- {
- int state;
- if (adev->wakeup.flags.valid)
- acpi_power_expose_hide(adev, &adev->wakeup.resources,
- &wakeup_attr_group, add);
- if (!adev->power.flags.power_resources)
- return;
- for (state = ACPI_STATE_D0; state <= ACPI_STATE_D3_HOT; state++)
- acpi_power_expose_hide(adev,
- &adev->power.states[state].resources,
- &attr_groups[state], add);
- }
- int acpi_power_wakeup_list_init(struct list_head *list, int *system_level_p)
- {
- struct acpi_power_resource_entry *entry;
- int system_level = 5;
- list_for_each_entry(entry, list, node) {
- struct acpi_power_resource *resource = entry->resource;
- acpi_handle handle = resource->device.handle;
- int result;
- int state;
- mutex_lock(&resource->resource_lock);
- result = acpi_power_get_state(handle, &state);
- if (result) {
- mutex_unlock(&resource->resource_lock);
- return result;
- }
- if (state == ACPI_POWER_RESOURCE_STATE_ON) {
- resource->ref_count++;
- resource->wakeup_enabled = true;
- }
- if (system_level > resource->system_level)
- system_level = resource->system_level;
- mutex_unlock(&resource->resource_lock);
- }
- *system_level_p = system_level;
- return 0;
- }
- /* --------------------------------------------------------------------------
- Device Power Management
- -------------------------------------------------------------------------- */
- /**
- * acpi_device_sleep_wake - execute _DSW (Device Sleep Wake) or (deprecated in
- * ACPI 3.0) _PSW (Power State Wake)
- * @dev: Device to handle.
- * @enable: 0 - disable, 1 - enable the wake capabilities of the device.
- * @sleep_state: Target sleep state of the system.
- * @dev_state: Target power state of the device.
- *
- * Execute _DSW (Device Sleep Wake) or (deprecated in ACPI 3.0) _PSW (Power
- * State Wake) for the device, if present. On failure reset the device's
- * wakeup.flags.valid flag.
- *
- * RETURN VALUE:
- * 0 if either _DSW or _PSW has been successfully executed
- * 0 if neither _DSW nor _PSW has been found
- * -ENODEV if the execution of either _DSW or _PSW has failed
- */
- int acpi_device_sleep_wake(struct acpi_device *dev,
- int enable, int sleep_state, int dev_state)
- {
- union acpi_object in_arg[3];
- struct acpi_object_list arg_list = { 3, in_arg };
- acpi_status status = AE_OK;
- /*
- * Try to execute _DSW first.
- *
- * Three arguments are needed for the _DSW object:
- * Argument 0: enable/disable the wake capabilities
- * Argument 1: target system state
- * Argument 2: target device state
- * When _DSW object is called to disable the wake capabilities, maybe
- * the first argument is filled. The values of the other two arguments
- * are meaningless.
- */
- in_arg[0].type = ACPI_TYPE_INTEGER;
- in_arg[0].integer.value = enable;
- in_arg[1].type = ACPI_TYPE_INTEGER;
- in_arg[1].integer.value = sleep_state;
- in_arg[2].type = ACPI_TYPE_INTEGER;
- in_arg[2].integer.value = dev_state;
- status = acpi_evaluate_object(dev->handle, "_DSW", &arg_list, NULL);
- if (ACPI_SUCCESS(status)) {
- return 0;
- } else if (status != AE_NOT_FOUND) {
- printk(KERN_ERR PREFIX "_DSW execution failed\n");
- dev->wakeup.flags.valid = 0;
- return -ENODEV;
- }
- /* Execute _PSW */
- status = acpi_execute_simple_method(dev->handle, "_PSW", enable);
- if (ACPI_FAILURE(status) && (status != AE_NOT_FOUND)) {
- printk(KERN_ERR PREFIX "_PSW execution failed\n");
- dev->wakeup.flags.valid = 0;
- return -ENODEV;
- }
- return 0;
- }
- /*
- * Prepare a wakeup device, two steps (Ref ACPI 2.0:P229):
- * 1. Power on the power resources required for the wakeup device
- * 2. Execute _DSW (Device Sleep Wake) or (deprecated in ACPI 3.0) _PSW (Power
- * State Wake) for the device, if present
- */
- int acpi_enable_wakeup_device_power(struct acpi_device *dev, int sleep_state)
- {
- struct acpi_power_resource_entry *entry;
- int err = 0;
- if (!dev || !dev->wakeup.flags.valid)
- return -EINVAL;
- mutex_lock(&acpi_device_lock);
- if (dev->wakeup.prepare_count++)
- goto out;
- list_for_each_entry(entry, &dev->wakeup.resources, node) {
- struct acpi_power_resource *resource = entry->resource;
- mutex_lock(&resource->resource_lock);
- if (!resource->wakeup_enabled) {
- err = acpi_power_on_unlocked(resource);
- if (!err)
- resource->wakeup_enabled = true;
- }
- mutex_unlock(&resource->resource_lock);
- if (err) {
- dev_err(&dev->dev,
- "Cannot turn wakeup power resources on\n");
- dev->wakeup.flags.valid = 0;
- goto out;
- }
- }
- /*
- * Passing 3 as the third argument below means the device may be
- * put into arbitrary power state afterward.
- */
- err = acpi_device_sleep_wake(dev, 1, sleep_state, 3);
- if (err)
- dev->wakeup.prepare_count = 0;
- out:
- mutex_unlock(&acpi_device_lock);
- return err;
- }
- /*
- * Shutdown a wakeup device, counterpart of above method
- * 1. Execute _DSW (Device Sleep Wake) or (deprecated in ACPI 3.0) _PSW (Power
- * State Wake) for the device, if present
- * 2. Shutdown down the power resources
- */
- int acpi_disable_wakeup_device_power(struct acpi_device *dev)
- {
- struct acpi_power_resource_entry *entry;
- int err = 0;
- if (!dev || !dev->wakeup.flags.valid)
- return -EINVAL;
- mutex_lock(&acpi_device_lock);
- if (--dev->wakeup.prepare_count > 0)
- goto out;
- /*
- * Executing the code below even if prepare_count is already zero when
- * the function is called may be useful, for example for initialisation.
- */
- if (dev->wakeup.prepare_count < 0)
- dev->wakeup.prepare_count = 0;
- err = acpi_device_sleep_wake(dev, 0, 0, 0);
- if (err)
- goto out;
- list_for_each_entry(entry, &dev->wakeup.resources, node) {
- struct acpi_power_resource *resource = entry->resource;
- mutex_lock(&resource->resource_lock);
- if (resource->wakeup_enabled) {
- err = acpi_power_off_unlocked(resource);
- if (!err)
- resource->wakeup_enabled = false;
- }
- mutex_unlock(&resource->resource_lock);
- if (err) {
- dev_err(&dev->dev,
- "Cannot turn wakeup power resources off\n");
- dev->wakeup.flags.valid = 0;
- break;
- }
- }
- out:
- mutex_unlock(&acpi_device_lock);
- return err;
- }
- int acpi_power_get_inferred_state(struct acpi_device *device, int *state)
- {
- int result = 0;
- int list_state = 0;
- int i = 0;
- if (!device || !state)
- return -EINVAL;
- /*
- * We know a device's inferred power state when all the resources
- * required for a given D-state are 'on'.
- */
- for (i = ACPI_STATE_D0; i <= ACPI_STATE_D3_HOT; i++) {
- struct list_head *list = &device->power.states[i].resources;
- if (list_empty(list))
- continue;
- result = acpi_power_get_list_state(list, &list_state);
- if (result)
- return result;
- if (list_state == ACPI_POWER_RESOURCE_STATE_ON) {
- *state = i;
- return 0;
- }
- }
- *state = device->power.states[ACPI_STATE_D3_COLD].flags.valid ?
- ACPI_STATE_D3_COLD : ACPI_STATE_D3_HOT;
- return 0;
- }
- int acpi_power_on_resources(struct acpi_device *device, int state)
- {
- if (!device || state < ACPI_STATE_D0 || state > ACPI_STATE_D3_HOT)
- return -EINVAL;
- return acpi_power_on_list(&device->power.states[state].resources);
- }
- int acpi_power_transition(struct acpi_device *device, int state)
- {
- int result = 0;
- if (!device || (state < ACPI_STATE_D0) || (state > ACPI_STATE_D3_COLD))
- return -EINVAL;
- if (device->power.state == state || !device->flags.power_manageable)
- return 0;
- if ((device->power.state < ACPI_STATE_D0)
- || (device->power.state > ACPI_STATE_D3_COLD))
- return -ENODEV;
- /*
- * First we reference all power resources required in the target list
- * (e.g. so the device doesn't lose power while transitioning). Then,
- * we dereference all power resources used in the current list.
- */
- if (state < ACPI_STATE_D3_COLD)
- result = acpi_power_on_list(
- &device->power.states[state].resources);
- if (!result && device->power.state < ACPI_STATE_D3_COLD)
- acpi_power_off_list(
- &device->power.states[device->power.state].resources);
- /* We shouldn't change the state unless the above operations succeed. */
- device->power.state = result ? ACPI_STATE_UNKNOWN : state;
- return result;
- }
- static void acpi_release_power_resource(struct device *dev)
- {
- struct acpi_device *device = to_acpi_device(dev);
- struct acpi_power_resource *resource;
- resource = container_of(device, struct acpi_power_resource, device);
- mutex_lock(&power_resource_list_lock);
- list_del(&resource->list_node);
- mutex_unlock(&power_resource_list_lock);
- acpi_free_pnp_ids(&device->pnp);
- kfree(resource);
- }
- static ssize_t resource_in_use_show(struct device *dev,
- struct device_attribute *attr,
- char *buf)
- {
- struct acpi_power_resource *resource;
- resource = to_power_resource(to_acpi_device(dev));
- return sprintf(buf, "%u\n", !!resource->ref_count);
- }
- static DEVICE_ATTR_RO(resource_in_use);
- static void acpi_power_sysfs_remove(struct acpi_device *device)
- {
- device_remove_file(&device->dev, &dev_attr_resource_in_use);
- }
- static void acpi_power_add_resource_to_list(struct acpi_power_resource *resource)
- {
- mutex_lock(&power_resource_list_lock);
- if (!list_empty(&acpi_power_resource_list)) {
- struct acpi_power_resource *r;
- list_for_each_entry(r, &acpi_power_resource_list, list_node)
- if (r->order > resource->order) {
- list_add_tail(&resource->list_node, &r->list_node);
- goto out;
- }
- }
- list_add_tail(&resource->list_node, &acpi_power_resource_list);
- out:
- mutex_unlock(&power_resource_list_lock);
- }
- int acpi_add_power_resource(acpi_handle handle)
- {
- struct acpi_power_resource *resource;
- struct acpi_device *device = NULL;
- union acpi_object acpi_object;
- struct acpi_buffer buffer = { sizeof(acpi_object), &acpi_object };
- acpi_status status;
- int state, result = -ENODEV;
- acpi_bus_get_device(handle, &device);
- if (device)
- return 0;
- resource = kzalloc(sizeof(*resource), GFP_KERNEL);
- if (!resource)
- return -ENOMEM;
- device = &resource->device;
- acpi_init_device_object(device, handle, ACPI_BUS_TYPE_POWER,
- ACPI_STA_DEFAULT);
- mutex_init(&resource->resource_lock);
- INIT_LIST_HEAD(&resource->list_node);
- INIT_LIST_HEAD(&resource->dependents);
- resource->name = device->pnp.bus_id;
- strcpy(acpi_device_name(device), ACPI_POWER_DEVICE_NAME);
- strcpy(acpi_device_class(device), ACPI_POWER_CLASS);
- device->power.state = ACPI_STATE_UNKNOWN;
- /* Evalute the object to get the system level and resource order. */
- status = acpi_evaluate_object(handle, NULL, NULL, &buffer);
- if (ACPI_FAILURE(status))
- goto err;
- resource->system_level = acpi_object.power_resource.system_level;
- resource->order = acpi_object.power_resource.resource_order;
- result = acpi_power_get_state(handle, &state);
- if (result)
- goto err;
- printk(KERN_INFO PREFIX "%s [%s] (%s)\n", acpi_device_name(device),
- acpi_device_bid(device), state ? "on" : "off");
- device->flags.match_driver = true;
- result = acpi_device_add(device, acpi_release_power_resource);
- if (result)
- goto err;
- if (!device_create_file(&device->dev, &dev_attr_resource_in_use))
- device->remove = acpi_power_sysfs_remove;
- acpi_power_add_resource_to_list(resource);
- acpi_device_add_finalize(device);
- return 0;
- err:
- acpi_release_power_resource(&device->dev);
- return result;
- }
- #ifdef CONFIG_ACPI_SLEEP
- void acpi_resume_power_resources(void)
- {
- struct acpi_power_resource *resource;
- mutex_lock(&power_resource_list_lock);
- list_for_each_entry(resource, &acpi_power_resource_list, list_node) {
- int result, state;
- mutex_lock(&resource->resource_lock);
- result = acpi_power_get_state(resource->device.handle, &state);
- if (result) {
- mutex_unlock(&resource->resource_lock);
- continue;
- }
- if (state == ACPI_POWER_RESOURCE_STATE_OFF
- && resource->ref_count) {
- dev_info(&resource->device.dev, "Turning ON\n");
- __acpi_power_on(resource);
- }
- mutex_unlock(&resource->resource_lock);
- }
- mutex_unlock(&power_resource_list_lock);
- }
- void acpi_turn_off_unused_power_resources(void)
- {
- struct acpi_power_resource *resource;
- mutex_lock(&power_resource_list_lock);
- list_for_each_entry_reverse(resource, &acpi_power_resource_list, list_node) {
- int result, state;
- mutex_lock(&resource->resource_lock);
- result = acpi_power_get_state(resource->device.handle, &state);
- if (result) {
- mutex_unlock(&resource->resource_lock);
- continue;
- }
- if (state == ACPI_POWER_RESOURCE_STATE_ON
- && !resource->ref_count) {
- dev_info(&resource->device.dev, "Turning OFF\n");
- __acpi_power_off(resource);
- }
- mutex_unlock(&resource->resource_lock);
- }
- mutex_unlock(&power_resource_list_lock);
- }
- #endif
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