path: root/drivers/power/supply/axp20x_battery.c

/*
 * Battery power supply driver for X-Powers AXP20X and AXP22X PMICs
 *
 * Copyright 2016 Free Electrons NextThing Co.
 *	Quentin Schulz <quentin.schulz@free-electrons.com>
 *
 * This driver is based on a previous upstreaming attempt by:
 *	Bruno Prémont <bonbons@linux-vserver.org>
 *
 * This file is subject to the terms and conditions of the GNU General
 * Public License. See the file "COPYING" in the main directory of this
 * archive for more details.
 *
 * This program is distributed in the hope that it will be useful,
 * but WITHOUT ANY WARRANTY; without even the implied warranty of
 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
 * GNU General Public License for more details.
 */

#include <linux/err.h>
#include <linux/interrupt.h>
#include <linux/irq.h>
#include <linux/module.h>
#include <linux/of.h>
#include <linux/of_device.h>
#include <linux/platform_device.h>
#include <linux/power_supply.h>
#include <linux/regmap.h>
#include <linux/slab.h>
#include <linux/time.h>
#include <linux/iio/iio.h>
#include <linux/iio/consumer.h>
#include <linux/mfd/axp20x.h>

#define AXP20X_PWR_STATUS_BAT_CHARGING	BIT(2)

#define AXP20X_PWR_OP_BATT_PRESENT	BIT(5)
#define AXP20X_PWR_OP_BATT_ACTIVATED	BIT(3)

#define AXP209_FG_PERCENT		GENMASK(6, 0)
#define AXP22X_FG_VALID			BIT(7)

#define AXP20X_CHRG_CTRL1_TGT_VOLT	GENMASK(6, 5)
#define AXP20X_CHRG_CTRL1_TGT_4_1V	(0 << 5)
#define AXP20X_CHRG_CTRL1_TGT_4_15V	(1 << 5)
#define AXP20X_CHRG_CTRL1_TGT_4_2V	(2 << 5)
#define AXP20X_CHRG_CTRL1_TGT_4_36V	(3 << 5)

#define AXP22X_CHRG_CTRL1_TGT_4_22V	(1 << 5)
#define AXP22X_CHRG_CTRL1_TGT_4_24V	(3 << 5)

#define AXP813_CHRG_CTRL1_TGT_4_35V	(3 << 5)

#define AXP20X_CHRG_CTRL1_TGT_CURR	GENMASK(3, 0)

#define AXP20X_V_OFF_MASK		GENMASK(2, 0)

struct axp20x_batt_ps;

struct axp_data {
	int	ccc_scale;
	int	ccc_offset;
	bool	has_fg_valid;
	int	(*get_max_voltage)(struct axp20x_batt_ps *batt, int *val);
	int	(*set_max_voltage)(struct axp20x_batt_ps *batt, int val);
};

struct axp20x_batt_ps {
	struct regmap *regmap;
	struct power_supply *batt;
	struct device *dev;
	struct iio_channel *batt_chrg_i;
	struct iio_channel *batt_dischrg_i;
	struct iio_channel *batt_v;
	/* Maximum constant charge current */
	unsigned int max_ccc;
	const struct axp_data	*data;
};

static int axp20x_battery_get_max_voltage(struct axp20x_batt_ps *axp20x_batt,
					  int *val)
{
	int ret, reg;

	ret = regmap_read(axp20x_batt->regmap, AXP20X_CHRG_CTRL1, &reg);
	if (ret)
		return ret;

	switch (reg & AXP20X_CHRG_CTRL1_TGT_VOLT) {
	case AXP20X_CHRG_CTRL1_TGT_4_1V:
		*val = 4100000;
		break;
	case AXP20X_CHRG_CTRL1_TGT_4_15V:
		*val = 4150000;
		break;
	case AXP20X_CHRG_CTRL1_TGT_4_2V:
		*val = 4200000;
		break;
	case AXP20X_CHRG_CTRL1_TGT_4_36V:
		*val = 4360000;
		break;
	default:
		return -EINVAL;
	}

	return 0;
}

static int axp22x_battery_get_max_voltage(struct axp20x_batt_ps *axp20x_batt,
					  int *val)
{
	int ret, reg;

	ret = regmap_read(axp20x_batt->regmap, AXP20X_CHRG_CTRL1, &reg);
	if (ret)
		return ret;

	switch (reg & AXP20X_CHRG_CTRL1_TGT_VOLT) {
	case AXP20X_CHRG_CTRL1_TGT_4_1V:
		*val = 4100000;
		break;
	case AXP20X_CHRG_CTRL1_TGT_4_2V:
		*val = 4200000;
		break;
	case AXP22X_CHRG_CTRL1_TGT_4_22V:
		*val = 4220000;
		break;
	case AXP22X_CHRG_CTRL1_TGT_4_24V:
		*val = 4240000;
		break;
	default:
		return -EINVAL;
	}

	return 0;
}

static int axp813_battery_get_max_voltage(struct axp20x_batt_ps *axp20x_batt,
					  int *val)
{
	int ret, reg;

	ret = regmap_read(axp20x_batt->regmap, AXP20X_CHRG_CTRL1, &reg);
	if (ret)
		return ret;

	switch (reg & AXP20X_CHRG_CTRL1_TGT_VOLT) {
	case AXP20X_CHRG_CTRL1_TGT_4_1V:
		*val = 4100000;
		break;
	case AXP20X_CHRG_CTRL1_TGT_4_15V:
		*val = 4150000;
		break;
	case AXP20X_CHRG_CTRL1_TGT_4_2V:
		*val = 4200000;
		break;
	case AXP813_CHRG_CTRL1_TGT_4_35V:
		*val = 4350000;
		break;
	default:
		return -EINVAL;
	}

	return 0;
}

static int axp20x_get_constant_charge_current(struct axp20x_batt_ps *axp,
					      int *val)
{
	int ret;

	ret = regmap_read(axp->regmap, AXP20X_CHRG_CTRL1, val);
	if (ret)
		return ret;

	*val &= AXP20X_CHRG_CTRL1_TGT_CURR;

	*val = *val * axp->data->ccc_scale + axp->data->ccc_offset;

	return 0;
}

static int axp20x_battery_get_prop(struct power_supply *psy,
				   enum power_supply_property psp,
				   union power_supply_propval *val)
{
	struct axp20x_batt_ps *axp20x_batt = power_supply_get_drvdata(psy);
	struct iio_channel *chan;
	int ret = 0, reg, val1;

	switch (psp) {
	case POWER_SUPPLY_PROP_PRESENT:
	case POWER_SUPPLY_PROP_ONLINE:
		ret = regmap_read(axp20x_batt->regmap, AXP20X_PWR_OP_MODE,
				  &reg);
		if (ret)
			return ret;

		val->intval = !!(reg & AXP20X_PWR_OP_BATT_PRESENT);
		break;

	case POWER_SUPPLY_PROP_STATUS:
		ret = regmap_read(axp20x_batt->regmap, AXP20X_PWR_INPUT_STATUS,
				  &reg);
		if (ret)
			return ret;

		if (reg & AXP20X_PWR_STATUS_BAT_CHARGING) {
			val->intval = POWER_SUPPLY_STATUS_CHARGING;
			return 0;
		}

		ret = iio_read_channel_processed(axp20x_batt->batt_dischrg_i,
						 &val1);
		if (ret)
			return ret;

		if (val1) {
			val->intval = POWER_SUPPLY_STATUS_DISCHARGING;
			return 0;
		}

		ret = regmap_read(axp20x_batt->regmap, AXP20X_FG_RES, &val1);
		if (ret)
			return ret;

		/*
		 * Fuel Gauge data takes 7 bits but the stored value seems to be
		 * directly the raw percentage without any scaling to 7 bits.
		 */
		if ((val1 & AXP209_FG_PERCENT) == 100)
			val->intval = POWER_SUPPLY_STATUS_FULL;
		else
			val->intval = POWER_SUPPLY_STATUS_NOT_CHARGING;
		break;

	case POWER_SUPPLY_PROP_HEALTH:
		ret = regmap_read(axp20x_batt->regmap, AXP20X_PWR_OP_MODE,
				  &val1);
		if (ret)
			return ret;

		if (val1 & AXP20X_PWR_OP_BATT_ACTIVATED) {
			val->intval = POWER_SUPPLY_HEALTH_DEAD;
			return 0;
		}

		val->intval = POWER_SUPPLY_HEALTH_GOOD;
		break;

	case POWER_SUPPLY_PROP_CONSTANT_CHARGE_CURRENT:
		ret = axp20x_get_constant_charge_current(axp20x_batt,
							 &val->intval);
		if (ret)
			return ret;
		break;

	case POWER_SUPPLY_PROP_CONSTANT_CHARGE_CURRENT_MAX:
		val->intval = axp20x_batt->max_ccc;
		break;

	case POWER_SUPPLY_PROP_CURRENT_NOW:
		ret = regmap_read(axp20x_batt->regmap, AXP20X_PWR_INPUT_STATUS,
				  &reg);
		if