diff options
Diffstat (limited to 'drivers/power/supply/axp20x_battery.c')
| -rw-r--r-- | drivers/power/supply/axp20x_battery.c | 647 |
1 files changed, 647 insertions, 0 deletions
diff --git a/drivers/power/supply/axp20x_battery.c b/drivers/power/supply/axp20x_battery.c new file mode 100644 index 000000000..9fda98b95 --- /dev/null +++ b/drivers/power/supply/axp20x_battery.c @@ -0,0 +1,647 @@ +/* + * 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 PrĂ©mont <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, ®); + 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, ®); + 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, ®); + 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); + 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, + ®); + 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, + ®); + 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, + ®); + if (ret) + return ret; + + if (reg & AXP20X_PWR_STATUS_BAT_CHARGING) { + ret = iio_read_channel_processed(axp20x_batt->batt_chrg_i, &val->intval); + } else { + ret = iio_read_channel_processed(axp20x_batt->batt_dischrg_i, &val1); + val->intval = -val1; + } + if (ret) + return ret; + + /* IIO framework gives mA but Power Supply framework gives uA */ + val->intval *= 1000; + break; + + case POWER_SUPPLY_PROP_CAPACITY: + /* When no battery is present, return capacity is 100% */ + ret = regmap_read(axp20x_batt->regmap, AXP20X_PWR_OP_MODE, + ®); + if (ret) + return ret; + + if (!(reg & AXP20X_PWR_OP_BATT_PRESENT)) { + val->intval = 100; + return 0; + } + + ret = regmap_read(axp20x_batt->regmap, AXP20X_FG_RES, ®); + if (ret) + return ret; + + if (axp20x_batt->data->has_fg_valid && !(reg & AXP22X_FG_VALID)) + return -EINVAL; + + /* + * Fuel Gauge data takes 7 bits but the stored value seems to be + * directly the raw percentage without any scaling to 7 bits. + */ + val->intval = reg & AXP209_FG_PERCENT; + break; + + case POWER_SUPPLY_PROP_VOLTAGE_MAX_DESIGN: + return axp20x_batt->data->get_max_voltage(axp20x_batt, + &val->intval); + + case POWER_SUPPLY_PROP_VOLTAGE_MIN_DESIGN: + ret = regmap_read(axp20x_batt->regmap, AXP20X_V_OFF, ®); + if (ret) + return ret; + + val->intval = 2600000 + 100000 * (reg & AXP20X_V_OFF_MASK); + break; + + case POWER_SUPPLY_PROP_VOLTAGE_NOW: + ret = iio_read_channel_processed(axp20x_batt->batt_v, + &val->intval); + if (ret) + return ret; + + /* IIO framework gives mV but Power Supply framework gives uV */ + val->intval *= 1000; + break; + + default: + return -EINVAL; + } + + return 0; +} + +static int axp22x_battery_set_max_voltage(struct axp20x_batt_ps *axp20x_batt, + int val) +{ + switch (val) { + case 4100000: + val = AXP20X_CHRG_CTRL1_TGT_4_1V; + break; + + case 4200000: + val = AXP20X_CHRG_CTRL1_TGT_4_2V; + break; + + default: + /* + * AXP20x max voltage can be set to 4.36V and AXP22X max voltage + * can be set to 4.22V and 4.24V, but these voltages are too + * high for Lithium based batteries (AXP PMICs are supposed to + * be used with these kinds of battery). + */ + return -EINVAL; + } + + return regmap_update_bits(axp20x_batt->regmap, AXP20X_CHRG_CTRL1, + AXP20X_CHRG_CTRL1_TGT_VOLT, val); +} + +static int axp20x_battery_set_max_voltage(struct axp20x_batt_ps *axp20x_batt, + int val) +{ + switch (val) { + case 4100000: + val = AXP20X_CHRG_CTRL1_TGT_4_1V; + break; + + case 4150000: + val = AXP20X_CHRG_CTRL1_TGT_4_15V; + break; + + case 4200000: + val = AXP20X_CHRG_CTRL1_TGT_4_2V; + break; + + default: + /* + * AXP20x max voltage can be set to 4.36V and AXP22X max voltage + * can be set to 4.22V and 4.24V, but these voltages are too + * high for Lithium based batteries (AXP PMICs are supposed to + * be used with these kinds of battery). + */ + return -EINVAL; + } + + return regmap_update_bits(axp20x_batt->regmap, AXP20X_CHRG_CTRL1, + AXP20X_CHRG_CTRL1_TGT_VOLT, val); +} + +static int axp20x_set_constant_charge_current(struct axp20x_batt_ps *axp_batt, + int charge_current) +{ + if (charge_current > axp_batt->max_ccc) + return -EINVAL; + + charge_current = (charge_current - axp_batt->data->ccc_offset) / + axp_batt->data->ccc_scale; + + if (charge_current > AXP20X_CHRG_CTRL1_TGT_CURR || charge_current < 0) + return -EINVAL; + + return regmap_update_bits(axp_batt->regmap, AXP20X_CHRG_CTRL1, + AXP20X_CHRG_CTRL1_TGT_CURR, charge_current); +} + +static int axp20x_set_max_constant_charge_current(struct axp20x_batt_ps *axp, + int charge_current) +{ + bool lower_max = false; + + charge_current = (charge_current - axp->data->ccc_offset) / + axp->data->ccc_scale; + + if (charge_current > AXP20X_CHRG_CTRL1_TGT_CURR || charge_current < 0) + return -EINVAL; + + charge_current = charge_current * axp->data->ccc_scale + + axp->data->ccc_offset; + + if (charge_current > axp->max_ccc) + dev_warn(axp->dev, + "Setting max constant charge current higher than previously defined. Note that increasing the constant charge current may damage your battery.\n"); + else + lower_max = true; + + axp->max_ccc = charge_current; + + if (lower_max) { + int current_cc; + + axp20x_get_constant_charge_current(axp, ¤t_cc); + if (current_cc > charge_current) + axp20x_set_constant_charge_current(axp, charge_current); + } + + return 0; +} +static int axp20x_set_voltage_min_design(struct axp20x_batt_ps *axp_batt, + int min_voltage) +{ + int val1 = (min_voltage - 2600000) / 100000; + + if (val1 < 0 || val1 > AXP20X_V_OFF_MASK) + return -EINVAL; + + return regmap_update_bits(axp_batt->regmap, AXP20X_V_OFF, + AXP20X_V_OFF_MASK, val1); +} + +static int axp20x_battery_set_prop(struct power_supply *psy, + enum power_supply_property psp, + const union power_supply_propval *val) +{ + struct axp20x_batt_ps *axp20x_batt = power_supply_get_drvdata(psy); + + switch (psp) { + case POWER_SUPPLY_PROP_VOLTAGE_MIN_DESIGN: + return axp20x_set_voltage_min_design(axp20x_batt, val->intval); + + case POWER_SUPPLY_PROP_VOLTAGE_MAX_DESIGN: + return axp20x_batt->data->set_max_voltage(axp20x_batt, val->intval); + + case POWER_SUPPLY_PROP_CONSTANT_CHARGE_CURRENT: + return axp20x_set_constant_charge_current(axp20x_batt, + val->intval); + case POWER_SUPPLY_PROP_CONSTANT_CHARGE_CURRENT_MAX: + return axp20x_set_max_constant_charge_current(axp20x_batt, + val->intval); + + default: + return -EINVAL; + } +} + +static enum power_supply_property axp20x_battery_props[] = { + POWER_SUPPLY_PROP_PRESENT, + POWER_SUPPLY_PROP_ONLINE, + POWER_SUPPLY_PROP_STATUS, + POWER_SUPPLY_PROP_VOLTAGE_NOW, + POWER_SUPPLY_PROP_CURRENT_NOW, + POWER_SUPPLY_PROP_CONSTANT_CHARGE_CURRENT, + POWER_SUPPLY_PROP_CONSTANT_CHARGE_CURRENT_MAX, + POWER_SUPPLY_PROP_HEALTH, + POWER_SUPPLY_PROP_VOLTAGE_MAX_DESIGN, + POWER_SUPPLY_PROP_VOLTAGE_MIN_DESIGN, + POWER_SUPPLY_PROP_CAPACITY, +}; + +static int axp20x_battery_prop_writeable(struct power_supply *psy, + enum power_supply_property psp) +{ + return psp == POWER_SUPPLY_PROP_VOLTAGE_MIN_DESIGN || + psp == POWER_SUPPLY_PROP_VOLTAGE_MAX_DESIGN || + psp == POWER_SUPPLY_PROP_CONSTANT_CHARGE_CURRENT || + psp == POWER_SUPPLY_PROP_CONSTANT_CHARGE_CURRENT_MAX; +} + +static const struct power_supply_desc axp20x_batt_ps_desc = { + .name = "axp20x-battery", + .type = POWER_SUPPLY_TYPE_BATTERY, + .properties = axp20x_battery_props, + .num_properties = ARRAY_SIZE(axp20x_battery_props), + .property_is_writeable = axp20x_battery_prop_writeable, + .get_property = axp20x_battery_get_prop, + .set_property = axp20x_battery_set_prop, +}; + +static const struct axp_data axp209_data = { + .ccc_scale = 100000, + .ccc_offset = 300000, + .get_max_voltage = axp20x_battery_get_max_voltage, + .set_max_voltage = axp20x_battery_set_max_voltage, +}; + +static const struct axp_data axp221_data = { + .ccc_scale = 150000, + .ccc_offset = 300000, + .has_fg_valid = true, + .get_max_voltage = axp22x_battery_get_max_voltage, + .set_max_voltage = axp22x_battery_set_max_voltage, +}; + +static const struct axp_data axp813_data = { + .ccc_scale = 200000, + .ccc_offset = 200000, + .has_fg_valid = true, + .get_max_voltage = axp813_battery_get_max_voltage, + .set_max_voltage = axp20x_battery_set_max_voltage, +}; + +static const struct of_device_id axp20x_battery_ps_id[] = { + { + .compatible = "x-powers,axp209-battery-power-supply", + .data = (void *)&axp209_data, + }, { + .compatible = "x-powers,axp221-battery-power-supply", + .data = (void *)&axp221_data, + }, { + .compatible = "x-powers,axp813-battery-power-supply", + .data = (void *)&axp813_data, + }, { /* sentinel */ }, +}; +MODULE_DEVICE_TABLE(of, axp20x_battery_ps_id); + +static int axp20x_power_probe(struct platform_device *pdev) +{ + struct axp20x_batt_ps *axp20x_batt; + struct power_supply_config psy_cfg = {}; + struct power_supply_battery_info info; + struct device *dev = &pdev->dev; + + if (!of_device_is_available(pdev->dev.of_node)) + return -ENODEV; + + axp20x_batt = devm_kzalloc(&pdev->dev, sizeof(*axp20x_batt), + GFP_KERNEL); + if (!axp20x_batt) + return -ENOMEM; + + axp20x_batt->dev = &pdev->dev; + + axp20x_batt->batt_v = devm_iio_channel_get(&pdev->dev, "batt_v"); + if (IS_ERR(axp20x_batt->batt_v)) { + if (PTR_ERR(axp20x_batt->batt_v) == -ENODEV) + return -EPROBE_DEFER; + return PTR_ERR(axp20x_batt->batt_v); + } + + axp20x_batt->batt_chrg_i = devm_iio_channel_get(&pdev->dev, + "batt_chrg_i"); + if (IS_ERR(axp20x_batt->batt_chrg_i)) { + if (PTR_ERR(axp20x_batt->batt_chrg_i) == -ENODEV) + return -EPROBE_DEFER; + return PTR_ERR(axp20x_batt->batt_chrg_i); + } + + axp20x_batt->batt_dischrg_i = devm_iio_channel_get(&pdev->dev, + "batt_dischrg_i"); + if (IS_ERR(axp20x_batt->batt_dischrg_i)) { + if (PTR_ERR(axp20x_batt->batt_dischrg_i) == -ENODEV) + return -EPROBE_DEFER; + return PTR_ERR(axp20x_batt->batt_dischrg_i); + } + + axp20x_batt->regmap = dev_get_regmap(pdev->dev.parent, NULL); + platform_set_drvdata(pdev, axp20x_batt); + + psy_cfg.drv_data = axp20x_batt; + psy_cfg.of_node = pdev->dev.of_node; + + axp20x_batt->data = (struct axp_data *)of_device_get_match_data(dev); + + axp20x_batt->batt = devm_power_supply_register(&pdev->dev, + &axp20x_batt_ps_desc, + &psy_cfg); + if (IS_ERR(axp20x_batt->batt)) { + dev_err(&pdev->dev, "failed to register power supply: %ld\n", + PTR_ERR(axp20x_batt->batt)); + return PTR_ERR(axp20x_batt->batt); + } + + if (!power_supply_get_battery_info(axp20x_batt->batt, &info)) { + int vmin = info.voltage_min_design_uv; + int ccc = info.constant_charge_current_max_ua; + + if (vmin > 0 && axp20x_set_voltage_min_design(axp20x_batt, + vmin)) + dev_err(&pdev->dev, + "couldn't set voltage_min_design\n"); + + /* Set max to unverified value to be able to set CCC */ + axp20x_batt->max_ccc = ccc; + + if (ccc <= 0 || axp20x_set_constant_charge_current(axp20x_batt, + ccc)) { + dev_err(&pdev->dev, + "couldn't set constant charge current from DT: fallback to minimum value\n"); + ccc = 300000; + axp20x_batt->max_ccc = ccc; + axp20x_set_constant_charge_current(axp20x_batt, ccc); + } + } + + /* + * Update max CCC to a valid value if battery info is present or set it + * to current register value by default. + */ + axp20x_get_constant_charge_current(axp20x_batt, + &axp20x_batt->max_ccc); + + return 0; +} + +static struct platform_driver axp20x_batt_driver = { + .probe = axp20x_power_probe, + .driver = { + .name = "axp20x-battery-power-supply", + .of_match_table = axp20x_battery_ps_id, + }, +}; + +module_platform_driver(axp20x_batt_driver); + +MODULE_DESCRIPTION("Battery power supply driver for AXP20X and AXP22X PMICs"); +MODULE_AUTHOR("Quentin Schulz <quentin.schulz@free-electrons.com>"); +MODULE_LICENSE("GPL"); |