power: supply: add sbs-charger driver (feb583e3) · Commits · e / devices / android_kernel_fairphone_FP4

drivers/power/supply/Kconfig

+6 −0

Original line number	Diff line number	Diff line
		@@ -164,6 +164,12 @@ config BATTERY_SBS
		Say Y to include support for SBS battery driver for SBS-compliant
		gas gauges.

		config CHARGER_SBS
		tristate "SBS Compliant charger"
		depends on I2C
		help
		Say Y to include support for SBS compilant battery chargers.

		config BATTERY_BQ27XXX
		tristate "BQ27xxx battery driver"
		help

drivers/power/supply/Makefile

+1 −0

Original line number	Diff line number	Diff line
		@@ -31,6 +31,7 @@ obj-$(CONFIG_BATTERY_COLLIE) += collie_battery.o
		obj-$(CONFIG_BATTERY_IPAQ_MICRO) += ipaq_micro_battery.o
		obj-$(CONFIG_BATTERY_WM97XX) += wm97xx_battery.o
		obj-$(CONFIG_BATTERY_SBS) += sbs-battery.o
		obj-$(CONFIG_CHARGER_SBS) += sbs-charger.o
		obj-$(CONFIG_BATTERY_BQ27XXX) += bq27xxx_battery.o
		obj-$(CONFIG_BATTERY_BQ27XXX_I2C) += bq27xxx_battery_i2c.o
		obj-$(CONFIG_BATTERY_DA9030) += da9030_battery.o

drivers/power/supply/sbs-charger.c

0 → 100644

+274 −0

Original line number	Diff line number	Diff line
		/*
		* Copyright (c) 2016, Prodys S.L.
		*
		* This program is free software; you can redistribute it and/or modify
		* it under the terms of the GNU General Public License as published by
		* the Free Software Foundation; either version 2 of the License, or
		* (at your option) any later version.
		*
		* This adds support for sbs-charger compilant chips as defined here:
		* http://sbs-forum.org/specs/sbc110.pdf
		*
		* Implemetation based on sbs-battery.c
		*/

		#include <linux/init.h>
		#include <linux/module.h>
		#include <linux/kernel.h>
		#include <linux/err.h>
		#include <linux/power_supply.h>
		#include <linux/i2c.h>
		#include <linux/slab.h>
		#include <linux/interrupt.h>
		#include <linux/gpio.h>
		#include <linux/regmap.h>
		#include <linux/of_gpio.h>
		#include <linux/bitops.h>

		#define SBS_CHARGER_REG_SPEC_INFO 0x11
		#define SBS_CHARGER_REG_STATUS 0x13
		#define SBS_CHARGER_REG_ALARM_WARNING 0x16

		#define SBS_CHARGER_STATUS_CHARGE_INHIBITED BIT(1)
		#define SBS_CHARGER_STATUS_RES_COLD BIT(9)
		#define SBS_CHARGER_STATUS_RES_HOT BIT(10)
		#define SBS_CHARGER_STATUS_BATTERY_PRESENT BIT(14)
		#define SBS_CHARGER_STATUS_AC_PRESENT BIT(15)

		#define SBS_CHARGER_POLL_TIME 500

		struct sbs_info {
		struct i2c_client *client;
		struct power_supply *power_supply;
		struct regmap *regmap;
		struct delayed_work work;
		unsigned int last_state;
		};

		static int sbs_get_property(struct power_supply *psy,
		enum power_supply_property psp,
		union power_supply_propval *val)
		{
		struct sbs_info *chip = power_supply_get_drvdata(psy);
		unsigned int reg;

		reg = chip->last_state;

		switch (psp) {
		case POWER_SUPPLY_PROP_PRESENT:
		val->intval = !!(reg & SBS_CHARGER_STATUS_BATTERY_PRESENT);
		break;

		case POWER_SUPPLY_PROP_ONLINE:
		val->intval = !!(reg & SBS_CHARGER_STATUS_AC_PRESENT);
		break;

		case POWER_SUPPLY_PROP_STATUS:
		val->intval = POWER_SUPPLY_STATUS_UNKNOWN;

		if (!(reg & SBS_CHARGER_STATUS_BATTERY_PRESENT))
		val->intval = POWER_SUPPLY_STATUS_NOT_CHARGING;
		else if (reg & SBS_CHARGER_STATUS_AC_PRESENT &&
		!(reg & SBS_CHARGER_STATUS_CHARGE_INHIBITED))
		val->intval = POWER_SUPPLY_STATUS_CHARGING;
		else
		val->intval = POWER_SUPPLY_STATUS_DISCHARGING;

		break;

		case POWER_SUPPLY_PROP_HEALTH:
		if (reg & SBS_CHARGER_STATUS_RES_COLD)
		val->intval = POWER_SUPPLY_HEALTH_COLD;
		if (reg & SBS_CHARGER_STATUS_RES_HOT)
		val->intval = POWER_SUPPLY_HEALTH_OVERHEAT;
		else
		val->intval = POWER_SUPPLY_HEALTH_GOOD;

		break;

		default:
		return -EINVAL;
		}

		return 0;
		}

		static int sbs_check_state(struct sbs_info *chip)
		{
		unsigned int reg;
		int ret;

		ret = regmap_read(chip->regmap, SBS_CHARGER_REG_STATUS, &reg);
		if (!ret && reg != chip->last_state) {
		chip->last_state = reg;
		power_supply_changed(chip->power_supply);
		return 1;
		}

		return 0;
		}

		static void sbs_delayed_work(struct work_struct *work)
		{
		struct sbs_info *chip = container_of(work, struct sbs_info, work.work);

		sbs_check_state(chip);

		schedule_delayed_work(&chip->work,
		msecs_to_jiffies(SBS_CHARGER_POLL_TIME));
		}

		static irqreturn_t sbs_irq_thread(int irq, void *data)
		{
		struct sbs_info *chip = data;
		int ret;

		ret = sbs_check_state(chip);

		return ret ? IRQ_HANDLED : IRQ_NONE;
		}

		static enum power_supply_property sbs_properties[] = {
		POWER_SUPPLY_PROP_STATUS,
		POWER_SUPPLY_PROP_PRESENT,
		POWER_SUPPLY_PROP_ONLINE,
		POWER_SUPPLY_PROP_HEALTH,
		};

		static bool sbs_readable_reg(struct device *dev, unsigned int reg)
		{
		if (reg < SBS_CHARGER_REG_SPEC_INFO)
		return false;
		else
		return true;
		}

		static bool sbs_volatile_reg(struct device *dev, unsigned int reg)
		{
		switch (reg) {
		case SBS_CHARGER_REG_STATUS:
		return true;
		}

		return false;
		}

		static const struct regmap_config sbs_regmap = {
		.reg_bits = 8,
		.val_bits = 16,
		.max_register = SBS_CHARGER_REG_ALARM_WARNING,
		.readable_reg = sbs_readable_reg,
		.volatile_reg = sbs_volatile_reg,
		.val_format_endian = REGMAP_ENDIAN_LITTLE, /* since based on SMBus */
		};

		static const struct power_supply_desc sbs_desc = {
		.name = "sbs-charger",
		.type = POWER_SUPPLY_TYPE_MAINS,
		.properties = sbs_properties,
		.num_properties = ARRAY_SIZE(sbs_properties),
		.get_property = sbs_get_property,
		};

		static int sbs_probe(struct i2c_client *client,
		const struct i2c_device_id *id)
		{
		struct power_supply_config psy_cfg = {};
		struct sbs_info *chip;
		int ret, val;

		chip = devm_kzalloc(&client->dev, sizeof(struct sbs_info), GFP_KERNEL);
		if (!chip)
		return -ENOMEM;

		chip->client = client;
		psy_cfg.of_node = client->dev.of_node;
		psy_cfg.drv_data = chip;

		i2c_set_clientdata(client, chip);

		chip->regmap = devm_regmap_init_i2c(client, &sbs_regmap);
		if (IS_ERR(chip->regmap))
		return PTR_ERR(chip->regmap);

		/*
		* Before we register, we need to make sure we can actually talk
		* to the battery.
		*/
		ret = regmap_read(chip->regmap, SBS_CHARGER_REG_STATUS, &val);
		if (ret) {
		dev_err(&client->dev, "Failed to get device status\n");
		return ret;
		}
		chip->last_state = val;

		chip->power_supply = devm_power_supply_register(&client->dev, &sbs_desc,
		&psy_cfg);
		if (IS_ERR(chip->power_supply)) {
		dev_err(&client->dev, "Failed to register power supply\n");
		return PTR_ERR(chip->power_supply);
		}

		/*
		* The sbs-charger spec doesn't impose the use of an interrupt. So in
		* the case it wasn't provided we use polling in order get the charger's
		* status.
		*/
		if (client->irq) {
		ret = devm_request_threaded_irq(&client->dev, client->irq,
		NULL, sbs_irq_thread,
		IRQF_TRIGGER_FALLING \| IRQF_ONESHOT,
		dev_name(&client->dev), chip);
		if (ret) {
		dev_err(&client->dev, "Failed to request irq, %d\n", ret);
		return ret;
		}
		} else {
		INIT_DELAYED_WORK(&chip->work, sbs_delayed_work);
		schedule_delayed_work(&chip->work,
		msecs_to_jiffies(SBS_CHARGER_POLL_TIME));
		}

		dev_info(&client->dev,
		"%s: smart charger device registered\n", client->name);

		return 0;
		}

		static int sbs_remove(struct i2c_client *client)
		{
		struct sbs_info *chip = i2c_get_clientdata(client);

		cancel_delayed_work_sync(&chip->work);

		return 0;
		}

		#ifdef CONFIG_OF
		static const struct of_device_id sbs_dt_ids[] = {
		{ .compatible = "sbs,sbs-charger" },
		{ },
		};
		MODULE_DEVICE_TABLE(of, sbs_dt_ids);
		#endif

		static const struct i2c_device_id sbs_id[] = {
		{ "sbs-charger", 0 },
		{ }
		};
		MODULE_DEVICE_TABLE(i2c, sbs_id);

		static struct i2c_driver sbs_driver = {
		.probe = sbs_probe,
		.remove = sbs_remove,
		.id_table = sbs_id,
		.driver = {
		.name = "sbs-charger",
		.of_match_table = of_match_ptr(sbs_dt_ids),
		},
		};
		module_i2c_driver(sbs_driver);

		MODULE_AUTHOR("Nicolas Saenz Julienne <nicolassaenzj@gmail.com>");
		MODULE_DESCRIPTION("SBS smart charger driver");
		MODULE_LICENSE("GPL v2");