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- // SPDX-License-Identifier: GPL-2.0+
- /*
- * Power supply driver for the RICOH RN5T618 power management chip family
- *
- * Copyright (C) 2020 Andreas Kemnade
- */
- #include <linux/kernel.h>
- #include <linux/device.h>
- #include <linux/bitops.h>
- #include <linux/errno.h>
- #include <linux/init.h>
- #include <linux/interrupt.h>
- #include <linux/module.h>
- #include <linux/mfd/rn5t618.h>
- #include <linux/platform_device.h>
- #include <linux/power_supply.h>
- #include <linux/regmap.h>
- #include <linux/slab.h>
- #define CHG_STATE_ADP_INPUT 0x40
- #define CHG_STATE_USB_INPUT 0x80
- #define CHG_STATE_MASK 0x1f
- #define CHG_STATE_CHG_OFF 0
- #define CHG_STATE_CHG_READY_VADP 1
- #define CHG_STATE_CHG_TRICKLE 2
- #define CHG_STATE_CHG_RAPID 3
- #define CHG_STATE_CHG_COMPLETE 4
- #define CHG_STATE_SUSPEND 5
- #define CHG_STATE_VCHG_OVER_VOL 6
- #define CHG_STATE_BAT_ERROR 7
- #define CHG_STATE_NO_BAT 8
- #define CHG_STATE_BAT_OVER_VOL 9
- #define CHG_STATE_BAT_TEMP_ERR 10
- #define CHG_STATE_DIE_ERR 11
- #define CHG_STATE_DIE_SHUTDOWN 12
- #define CHG_STATE_NO_BAT2 13
- #define CHG_STATE_CHG_READY_VUSB 14
- #define FG_ENABLE 1
- struct rn5t618_power_info {
- struct rn5t618 *rn5t618;
- struct platform_device *pdev;
- struct power_supply *battery;
- struct power_supply *usb;
- struct power_supply *adp;
- int irq;
- };
- static enum power_supply_property rn5t618_usb_props[] = {
- POWER_SUPPLY_PROP_STATUS,
- POWER_SUPPLY_PROP_ONLINE,
- };
- static enum power_supply_property rn5t618_adp_props[] = {
- POWER_SUPPLY_PROP_STATUS,
- POWER_SUPPLY_PROP_ONLINE,
- };
- static enum power_supply_property rn5t618_battery_props[] = {
- POWER_SUPPLY_PROP_STATUS,
- POWER_SUPPLY_PROP_PRESENT,
- POWER_SUPPLY_PROP_VOLTAGE_NOW,
- POWER_SUPPLY_PROP_CURRENT_NOW,
- POWER_SUPPLY_PROP_CAPACITY,
- POWER_SUPPLY_PROP_TEMP,
- POWER_SUPPLY_PROP_TIME_TO_EMPTY_NOW,
- POWER_SUPPLY_PROP_TIME_TO_FULL_NOW,
- POWER_SUPPLY_PROP_TECHNOLOGY,
- POWER_SUPPLY_PROP_CHARGE_FULL,
- POWER_SUPPLY_PROP_CHARGE_NOW,
- };
- static int rn5t618_battery_read_doublereg(struct rn5t618_power_info *info,
- u8 reg, u16 *result)
- {
- int ret, i;
- u8 data[2];
- u16 old, new;
- old = 0;
- /* Prevent races when registers are changing. */
- for (i = 0; i < 3; i++) {
- ret = regmap_bulk_read(info->rn5t618->regmap,
- reg, data, sizeof(data));
- if (ret)
- return ret;
- new = data[0] << 8;
- new |= data[1];
- if (new == old)
- break;
- old = new;
- }
- *result = new;
- return 0;
- }
- static int rn5t618_decode_status(unsigned int status)
- {
- switch (status & CHG_STATE_MASK) {
- case CHG_STATE_CHG_OFF:
- case CHG_STATE_SUSPEND:
- case CHG_STATE_VCHG_OVER_VOL:
- case CHG_STATE_DIE_SHUTDOWN:
- return POWER_SUPPLY_STATUS_DISCHARGING;
- case CHG_STATE_CHG_TRICKLE:
- case CHG_STATE_CHG_RAPID:
- return POWER_SUPPLY_STATUS_CHARGING;
- case CHG_STATE_CHG_COMPLETE:
- return POWER_SUPPLY_STATUS_FULL;
- default:
- return POWER_SUPPLY_STATUS_NOT_CHARGING;
- }
- }
- static int rn5t618_battery_status(struct rn5t618_power_info *info,
- union power_supply_propval *val)
- {
- unsigned int v;
- int ret;
- ret = regmap_read(info->rn5t618->regmap, RN5T618_CHGSTATE, &v);
- if (ret)
- return ret;
- val->intval = POWER_SUPPLY_STATUS_UNKNOWN;
- if (v & 0xc0) { /* USB or ADP plugged */
- val->intval = rn5t618_decode_status(v);
- } else
- val->intval = POWER_SUPPLY_STATUS_DISCHARGING;
- return ret;
- }
- static int rn5t618_battery_present(struct rn5t618_power_info *info,
- union power_supply_propval *val)
- {
- unsigned int v;
- int ret;
- ret = regmap_read(info->rn5t618->regmap, RN5T618_CHGSTATE, &v);
- if (ret)
- return ret;
- v &= CHG_STATE_MASK;
- if ((v == CHG_STATE_NO_BAT) || (v == CHG_STATE_NO_BAT2))
- val->intval = 0;
- else
- val->intval = 1;
- return ret;
- }
- static int rn5t618_battery_voltage_now(struct rn5t618_power_info *info,
- union power_supply_propval *val)
- {
- u16 res;
- int ret;
- ret = rn5t618_battery_read_doublereg(info, RN5T618_VOLTAGE_1, &res);
- if (ret)
- return ret;
- val->intval = res * 2 * 2500 / 4095 * 1000;
- return 0;
- }
- static int rn5t618_battery_current_now(struct rn5t618_power_info *info,
- union power_supply_propval *val)
- {
- u16 res;
- int ret;
- ret = rn5t618_battery_read_doublereg(info, RN5T618_CC_AVEREG1, &res);
- if (ret)
- return ret;
- /* current is negative when discharging */
- val->intval = sign_extend32(res, 13) * 1000;
- return 0;
- }
- static int rn5t618_battery_capacity(struct rn5t618_power_info *info,
- union power_supply_propval *val)
- {
- unsigned int v;
- int ret;
- ret = regmap_read(info->rn5t618->regmap, RN5T618_SOC, &v);
- if (ret)
- return ret;
- val->intval = v;
- return 0;
- }
- static int rn5t618_battery_temp(struct rn5t618_power_info *info,
- union power_supply_propval *val)
- {
- u16 res;
- int ret;
- ret = rn5t618_battery_read_doublereg(info, RN5T618_TEMP_1, &res);
- if (ret)
- return ret;
- val->intval = sign_extend32(res, 11) * 10 / 16;
- return 0;
- }
- static int rn5t618_battery_tte(struct rn5t618_power_info *info,
- union power_supply_propval *val)
- {
- u16 res;
- int ret;
- ret = rn5t618_battery_read_doublereg(info, RN5T618_TT_EMPTY_H, &res);
- if (ret)
- return ret;
- if (res == 65535)
- return -ENODATA;
- val->intval = res * 60;
- return 0;
- }
- static int rn5t618_battery_ttf(struct rn5t618_power_info *info,
- union power_supply_propval *val)
- {
- u16 res;
- int ret;
- ret = rn5t618_battery_read_doublereg(info, RN5T618_TT_FULL_H, &res);
- if (ret)
- return ret;
- if (res == 65535)
- return -ENODATA;
- val->intval = res * 60;
- return 0;
- }
- static int rn5t618_battery_charge_full(struct rn5t618_power_info *info,
- union power_supply_propval *val)
- {
- u16 res;
- int ret;
- ret = rn5t618_battery_read_doublereg(info, RN5T618_FA_CAP_H, &res);
- if (ret)
- return ret;
- val->intval = res * 1000;
- return 0;
- }
- static int rn5t618_battery_charge_now(struct rn5t618_power_info *info,
- union power_supply_propval *val)
- {
- u16 res;
- int ret;
- ret = rn5t618_battery_read_doublereg(info, RN5T618_RE_CAP_H, &res);
- if (ret)
- return ret;
- val->intval = res * 1000;
- return 0;
- }
- static int rn5t618_battery_get_property(struct power_supply *psy,
- enum power_supply_property psp,
- union power_supply_propval *val)
- {
- int ret = 0;
- struct rn5t618_power_info *info = power_supply_get_drvdata(psy);
- switch (psp) {
- case POWER_SUPPLY_PROP_STATUS:
- ret = rn5t618_battery_status(info, val);
- break;
- case POWER_SUPPLY_PROP_PRESENT:
- ret = rn5t618_battery_present(info, val);
- break;
- case POWER_SUPPLY_PROP_VOLTAGE_NOW:
- ret = rn5t618_battery_voltage_now(info, val);
- break;
- case POWER_SUPPLY_PROP_CURRENT_NOW:
- ret = rn5t618_battery_current_now(info, val);
- break;
- case POWER_SUPPLY_PROP_CAPACITY:
- ret = rn5t618_battery_capacity(info, val);
- break;
- case POWER_SUPPLY_PROP_TEMP:
- ret = rn5t618_battery_temp(info, val);
- break;
- case POWER_SUPPLY_PROP_TIME_TO_EMPTY_NOW:
- ret = rn5t618_battery_tte(info, val);
- break;
- case POWER_SUPPLY_PROP_TIME_TO_FULL_NOW:
- ret = rn5t618_battery_ttf(info, val);
- break;
- case POWER_SUPPLY_PROP_TECHNOLOGY:
- val->intval = POWER_SUPPLY_TECHNOLOGY_LION;
- break;
- case POWER_SUPPLY_PROP_CHARGE_FULL:
- ret = rn5t618_battery_charge_full(info, val);
- break;
- case POWER_SUPPLY_PROP_CHARGE_NOW:
- ret = rn5t618_battery_charge_now(info, val);
- break;
- default:
- return -EINVAL;
- }
- return ret;
- }
- static int rn5t618_adp_get_property(struct power_supply *psy,
- enum power_supply_property psp,
- union power_supply_propval *val)
- {
- struct rn5t618_power_info *info = power_supply_get_drvdata(psy);
- unsigned int chgstate;
- bool online;
- int ret;
- ret = regmap_read(info->rn5t618->regmap, RN5T618_CHGSTATE, &chgstate);
- if (ret)
- return ret;
- online = !!(chgstate & CHG_STATE_ADP_INPUT);
- switch (psp) {
- case POWER_SUPPLY_PROP_ONLINE:
- val->intval = online;
- break;
- case POWER_SUPPLY_PROP_STATUS:
- if (!online) {
- val->intval = POWER_SUPPLY_STATUS_NOT_CHARGING;
- break;
- }
- val->intval = rn5t618_decode_status(chgstate);
- if (val->intval != POWER_SUPPLY_STATUS_CHARGING)
- val->intval = POWER_SUPPLY_STATUS_NOT_CHARGING;
- break;
- default:
- return -EINVAL;
- }
- return 0;
- }
- static int rn5t618_usb_get_property(struct power_supply *psy,
- enum power_supply_property psp,
- union power_supply_propval *val)
- {
- struct rn5t618_power_info *info = power_supply_get_drvdata(psy);
- unsigned int chgstate;
- bool online;
- int ret;
- ret = regmap_read(info->rn5t618->regmap, RN5T618_CHGSTATE, &chgstate);
- if (ret)
- return ret;
- online = !!(chgstate & CHG_STATE_USB_INPUT);
- switch (psp) {
- case POWER_SUPPLY_PROP_ONLINE:
- val->intval = online;
- break;
- case POWER_SUPPLY_PROP_STATUS:
- if (!online) {
- val->intval = POWER_SUPPLY_STATUS_NOT_CHARGING;
- break;
- }
- val->intval = rn5t618_decode_status(chgstate);
- if (val->intval != POWER_SUPPLY_STATUS_CHARGING)
- val->intval = POWER_SUPPLY_STATUS_NOT_CHARGING;
- break;
- default:
- return -EINVAL;
- }
- return 0;
- }
- static const struct power_supply_desc rn5t618_battery_desc = {
- .name = "rn5t618-battery",
- .type = POWER_SUPPLY_TYPE_BATTERY,
- .properties = rn5t618_battery_props,
- .num_properties = ARRAY_SIZE(rn5t618_battery_props),
- .get_property = rn5t618_battery_get_property,
- };
- static const struct power_supply_desc rn5t618_adp_desc = {
- .name = "rn5t618-adp",
- .type = POWER_SUPPLY_TYPE_MAINS,
- .properties = rn5t618_adp_props,
- .num_properties = ARRAY_SIZE(rn5t618_adp_props),
- .get_property = rn5t618_adp_get_property,
- };
- static const struct power_supply_desc rn5t618_usb_desc = {
- .name = "rn5t618-usb",
- .type = POWER_SUPPLY_TYPE_USB,
- .properties = rn5t618_usb_props,
- .num_properties = ARRAY_SIZE(rn5t618_usb_props),
- .get_property = rn5t618_usb_get_property,
- };
- static irqreturn_t rn5t618_charger_irq(int irq, void *data)
- {
- struct device *dev = data;
- struct rn5t618_power_info *info = dev_get_drvdata(dev);
- unsigned int ctrl, stat1, stat2, err;
- regmap_read(info->rn5t618->regmap, RN5T618_CHGERR_IRR, &err);
- regmap_read(info->rn5t618->regmap, RN5T618_CHGCTRL_IRR, &ctrl);
- regmap_read(info->rn5t618->regmap, RN5T618_CHGSTAT_IRR1, &stat1);
- regmap_read(info->rn5t618->regmap, RN5T618_CHGSTAT_IRR2, &stat2);
- regmap_write(info->rn5t618->regmap, RN5T618_CHGERR_IRR, 0);
- regmap_write(info->rn5t618->regmap, RN5T618_CHGCTRL_IRR, 0);
- regmap_write(info->rn5t618->regmap, RN5T618_CHGSTAT_IRR1, 0);
- regmap_write(info->rn5t618->regmap, RN5T618_CHGSTAT_IRR2, 0);
- dev_dbg(dev, "chgerr: %x chgctrl: %x chgstat: %x chgstat2: %x\n",
- err, ctrl, stat1, stat2);
- power_supply_changed(info->usb);
- power_supply_changed(info->adp);
- power_supply_changed(info->battery);
- return IRQ_HANDLED;
- }
- static int rn5t618_power_probe(struct platform_device *pdev)
- {
- int ret = 0;
- unsigned int v;
- struct power_supply_config psy_cfg = {};
- struct rn5t618_power_info *info;
- info = devm_kzalloc(&pdev->dev, sizeof(*info), GFP_KERNEL);
- if (!info)
- return -ENOMEM;
- info->pdev = pdev;
- info->rn5t618 = dev_get_drvdata(pdev->dev.parent);
- info->irq = -1;
- platform_set_drvdata(pdev, info);
- ret = regmap_read(info->rn5t618->regmap, RN5T618_CONTROL, &v);
- if (ret)
- return ret;
- if (!(v & FG_ENABLE)) {
- /* E.g. the vendor kernels of various Kobo and Tolino Ebook
- * readers disable the fuel gauge on shutdown. If a kernel
- * without fuel gauge support is booted after that, the fuel
- * gauge will get decalibrated.
- */
- dev_info(&pdev->dev, "Fuel gauge not enabled, enabling now\n");
- dev_info(&pdev->dev, "Expect imprecise results\n");
- regmap_update_bits(info->rn5t618->regmap, RN5T618_CONTROL,
- FG_ENABLE, FG_ENABLE);
- }
- psy_cfg.drv_data = info;
- info->battery = devm_power_supply_register(&pdev->dev,
- &rn5t618_battery_desc,
- &psy_cfg);
- if (IS_ERR(info->battery)) {
- ret = PTR_ERR(info->battery);
- dev_err(&pdev->dev, "failed to register battery: %d\n", ret);
- return ret;
- }
- info->adp = devm_power_supply_register(&pdev->dev,
- &rn5t618_adp_desc,
- &psy_cfg);
- if (IS_ERR(info->adp)) {
- ret = PTR_ERR(info->adp);
- dev_err(&pdev->dev, "failed to register adp: %d\n", ret);
- return ret;
- }
- info->usb = devm_power_supply_register(&pdev->dev,
- &rn5t618_usb_desc,
- &psy_cfg);
- if (IS_ERR(info->usb)) {
- ret = PTR_ERR(info->usb);
- dev_err(&pdev->dev, "failed to register usb: %d\n", ret);
- return ret;
- }
- if (info->rn5t618->irq_data)
- info->irq = regmap_irq_get_virq(info->rn5t618->irq_data,
- RN5T618_IRQ_CHG);
- if (info->irq < 0)
- info->irq = -1;
- else {
- ret = devm_request_threaded_irq(&pdev->dev, info->irq, NULL,
- rn5t618_charger_irq,
- IRQF_ONESHOT,
- "rn5t618_power",
- &pdev->dev);
- if (ret < 0) {
- dev_err(&pdev->dev, "request IRQ:%d fail\n",
- info->irq);
- info->irq = -1;
- }
- }
- return 0;
- }
- static struct platform_driver rn5t618_power_driver = {
- .driver = {
- .name = "rn5t618-power",
- },
- .probe = rn5t618_power_probe,
- };
- module_platform_driver(rn5t618_power_driver);
- MODULE_ALIAS("platform:rn5t618-power");
- MODULE_DESCRIPTION("Power supply driver for RICOH RN5T618");
- MODULE_LICENSE("GPL");
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