diff options
Diffstat (limited to 'drivers/power/supply/rn5t618_power.c')
| -rw-r--r-- | drivers/power/supply/rn5t618_power.c | 556 |
1 files changed, 556 insertions, 0 deletions
diff --git a/drivers/power/supply/rn5t618_power.c b/drivers/power/supply/rn5t618_power.c new file mode 100644 index 000000000000..dee520f0fdf5 --- /dev/null +++ b/drivers/power/supply/rn5t618_power.c @@ -0,0 +1,556 @@ +// 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"); |