From ace9429bb58fd418f0c81d4c2835699bddf6bde6 Mon Sep 17 00:00:00 2001 From: Daniel Baumann Date: Thu, 11 Apr 2024 10:27:49 +0200 Subject: Adding upstream version 6.6.15. Signed-off-by: Daniel Baumann --- drivers/power/supply/bq24257_charger.c | 1176 ++++++++++++++++++++++++++++++++ 1 file changed, 1176 insertions(+) create mode 100644 drivers/power/supply/bq24257_charger.c (limited to 'drivers/power/supply/bq24257_charger.c') diff --git a/drivers/power/supply/bq24257_charger.c b/drivers/power/supply/bq24257_charger.c new file mode 100644 index 0000000000..2852860abf --- /dev/null +++ b/drivers/power/supply/bq24257_charger.c @@ -0,0 +1,1176 @@ +// SPDX-License-Identifier: GPL-2.0-or-later +/* + * TI BQ24257 charger driver + * + * Copyright (C) 2015 Intel Corporation + * + * Datasheets: + * https://www.ti.com/product/bq24250 + * https://www.ti.com/product/bq24251 + * https://www.ti.com/product/bq24257 + */ + +#include +#include +#include +#include +#include +#include +#include +#include + +#include +#include + +#define BQ24257_REG_1 0x00 +#define BQ24257_REG_2 0x01 +#define BQ24257_REG_3 0x02 +#define BQ24257_REG_4 0x03 +#define BQ24257_REG_5 0x04 +#define BQ24257_REG_6 0x05 +#define BQ24257_REG_7 0x06 + +#define BQ24257_MANUFACTURER "Texas Instruments" +#define BQ24257_PG_GPIO "pg" + +#define BQ24257_ILIM_SET_DELAY 1000 /* msec */ + +/* + * When adding support for new devices make sure that enum bq2425x_chip and + * bq2425x_chip_name[] always stay in sync! + */ +enum bq2425x_chip { + BQ24250, + BQ24251, + BQ24257, +}; + +static const char *const bq2425x_chip_name[] = { + "bq24250", + "bq24251", + "bq24257", +}; + +enum bq24257_fields { + F_WD_FAULT, F_WD_EN, F_STAT, F_FAULT, /* REG 1 */ + F_RESET, F_IILIMIT, F_EN_STAT, F_EN_TERM, F_CE, F_HZ_MODE, /* REG 2 */ + F_VBAT, F_USB_DET, /* REG 3 */ + F_ICHG, F_ITERM, /* REG 4 */ + F_LOOP_STATUS, F_LOW_CHG, F_DPDM_EN, F_CE_STATUS, F_VINDPM, /* REG 5 */ + F_X2_TMR_EN, F_TMR, F_SYSOFF, F_TS_EN, F_TS_STAT, /* REG 6 */ + F_VOVP, F_CLR_VDP, F_FORCE_BATDET, F_FORCE_PTM, /* REG 7 */ + + F_MAX_FIELDS +}; + +/* initial field values, converted from uV/uA */ +struct bq24257_init_data { + u8 ichg; /* charge current */ + u8 vbat; /* regulation voltage */ + u8 iterm; /* termination current */ + u8 iilimit; /* input current limit */ + u8 vovp; /* over voltage protection voltage */ + u8 vindpm; /* VDMP input threshold voltage */ +}; + +struct bq24257_state { + u8 status; + u8 fault; + bool power_good; +}; + +struct bq24257_device { + struct i2c_client *client; + struct device *dev; + struct power_supply *charger; + + enum bq2425x_chip chip; + + struct regmap *rmap; + struct regmap_field *rmap_fields[F_MAX_FIELDS]; + + struct gpio_desc *pg; + + struct delayed_work iilimit_setup_work; + + struct bq24257_init_data init_data; + struct bq24257_state state; + + struct mutex lock; /* protect state data */ + + bool iilimit_autoset_enable; +}; + +static bool bq24257_is_volatile_reg(struct device *dev, unsigned int reg) +{ + switch (reg) { + case BQ24257_REG_2: + case BQ24257_REG_4: + return false; + + default: + return true; + } +} + +static const struct regmap_config bq24257_regmap_config = { + .reg_bits = 8, + .val_bits = 8, + + .max_register = BQ24257_REG_7, + .cache_type = REGCACHE_RBTREE, + + .volatile_reg = bq24257_is_volatile_reg, +}; + +static const struct reg_field bq24257_reg_fields[] = { + /* REG 1 */ + [F_WD_FAULT] = REG_FIELD(BQ24257_REG_1, 7, 7), + [F_WD_EN] = REG_FIELD(BQ24257_REG_1, 6, 6), + [F_STAT] = REG_FIELD(BQ24257_REG_1, 4, 5), + [F_FAULT] = REG_FIELD(BQ24257_REG_1, 0, 3), + /* REG 2 */ + [F_RESET] = REG_FIELD(BQ24257_REG_2, 7, 7), + [F_IILIMIT] = REG_FIELD(BQ24257_REG_2, 4, 6), + [F_EN_STAT] = REG_FIELD(BQ24257_REG_2, 3, 3), + [F_EN_TERM] = REG_FIELD(BQ24257_REG_2, 2, 2), + [F_CE] = REG_FIELD(BQ24257_REG_2, 1, 1), + [F_HZ_MODE] = REG_FIELD(BQ24257_REG_2, 0, 0), + /* REG 3 */ + [F_VBAT] = REG_FIELD(BQ24257_REG_3, 2, 7), + [F_USB_DET] = REG_FIELD(BQ24257_REG_3, 0, 1), + /* REG 4 */ + [F_ICHG] = REG_FIELD(BQ24257_REG_4, 3, 7), + [F_ITERM] = REG_FIELD(BQ24257_REG_4, 0, 2), + /* REG 5 */ + [F_LOOP_STATUS] = REG_FIELD(BQ24257_REG_5, 6, 7), + [F_LOW_CHG] = REG_FIELD(BQ24257_REG_5, 5, 5), + [F_DPDM_EN] = REG_FIELD(BQ24257_REG_5, 4, 4), + [F_CE_STATUS] = REG_FIELD(BQ24257_REG_5, 3, 3), + [F_VINDPM] = REG_FIELD(BQ24257_REG_5, 0, 2), + /* REG 6 */ + [F_X2_TMR_EN] = REG_FIELD(BQ24257_REG_6, 7, 7), + [F_TMR] = REG_FIELD(BQ24257_REG_6, 5, 6), + [F_SYSOFF] = REG_FIELD(BQ24257_REG_6, 4, 4), + [F_TS_EN] = REG_FIELD(BQ24257_REG_6, 3, 3), + [F_TS_STAT] = REG_FIELD(BQ24257_REG_6, 0, 2), + /* REG 7 */ + [F_VOVP] = REG_FIELD(BQ24257_REG_7, 5, 7), + [F_CLR_VDP] = REG_FIELD(BQ24257_REG_7, 4, 4), + [F_FORCE_BATDET] = REG_FIELD(BQ24257_REG_7, 3, 3), + [F_FORCE_PTM] = REG_FIELD(BQ24257_REG_7, 2, 2) +}; + +static const u32 bq24257_vbat_map[] = { + 3500000, 3520000, 3540000, 3560000, 3580000, 3600000, 3620000, 3640000, + 3660000, 3680000, 3700000, 3720000, 3740000, 3760000, 3780000, 3800000, + 3820000, 3840000, 3860000, 3880000, 3900000, 3920000, 3940000, 3960000, + 3980000, 4000000, 4020000, 4040000, 4060000, 4080000, 4100000, 4120000, + 4140000, 4160000, 4180000, 4200000, 4220000, 4240000, 4260000, 4280000, + 4300000, 4320000, 4340000, 4360000, 4380000, 4400000, 4420000, 4440000 +}; + +#define BQ24257_VBAT_MAP_SIZE ARRAY_SIZE(bq24257_vbat_map) + +static const u32 bq24257_ichg_map[] = { + 500000, 550000, 600000, 650000, 700000, 750000, 800000, 850000, 900000, + 950000, 1000000, 1050000, 1100000, 1150000, 1200000, 1250000, 1300000, + 1350000, 1400000, 1450000, 1500000, 1550000, 1600000, 1650000, 1700000, + 1750000, 1800000, 1850000, 1900000, 1950000, 2000000 +}; + +#define BQ24257_ICHG_MAP_SIZE ARRAY_SIZE(bq24257_ichg_map) + +static const u32 bq24257_iterm_map[] = { + 50000, 75000, 100000, 125000, 150000, 175000, 200000, 225000 +}; + +#define BQ24257_ITERM_MAP_SIZE ARRAY_SIZE(bq24257_iterm_map) + +static const u32 bq24257_iilimit_map[] = { + 100000, 150000, 500000, 900000, 1500000, 2000000 +}; + +#define BQ24257_IILIMIT_MAP_SIZE ARRAY_SIZE(bq24257_iilimit_map) + +static const u32 bq24257_vovp_map[] = { + 6000000, 6500000, 7000000, 8000000, 9000000, 9500000, 10000000, + 10500000 +}; + +#define BQ24257_VOVP_MAP_SIZE ARRAY_SIZE(bq24257_vovp_map) + +static const u32 bq24257_vindpm_map[] = { + 4200000, 4280000, 4360000, 4440000, 4520000, 4600000, 4680000, + 4760000 +}; + +#define BQ24257_VINDPM_MAP_SIZE ARRAY_SIZE(bq24257_vindpm_map) + +static int bq24257_field_read(struct bq24257_device *bq, + enum bq24257_fields field_id) +{ + int ret; + int val; + + ret = regmap_field_read(bq->rmap_fields[field_id], &val); + if (ret < 0) + return ret; + + return val; +} + +static int bq24257_field_write(struct bq24257_device *bq, + enum bq24257_fields field_id, u8 val) +{ + return regmap_field_write(bq->rmap_fields[field_id], val); +} + +static u8 bq24257_find_idx(u32 value, const u32 *map, u8 map_size) +{ + u8 idx; + + for (idx = 1; idx < map_size; idx++) + if (value < map[idx]) + break; + + return idx - 1; +} + +enum bq24257_status { + STATUS_READY, + STATUS_CHARGE_IN_PROGRESS, + STATUS_CHARGE_DONE, + STATUS_FAULT, +}; + +enum bq24257_fault { + FAULT_NORMAL, + FAULT_INPUT_OVP, + FAULT_INPUT_UVLO, + FAULT_SLEEP, + FAULT_BAT_TS, + FAULT_BAT_OVP, + FAULT_TS, + FAULT_TIMER, + FAULT_NO_BAT, + FAULT_ISET, + FAULT_INPUT_LDO_LOW, +}; + +static int bq24257_get_input_current_limit(struct bq24257_device *bq, + union power_supply_propval *val) +{ + int ret; + + ret = bq24257_field_read(bq, F_IILIMIT); + if (ret < 0) + return ret; + + /* + * The "External ILIM" and "Production & Test" modes are not exposed + * through this driver and not being covered by the lookup table. + * Should such a mode have become active let's return an error rather + * than exceeding the bounds of the lookup table and returning + * garbage. + */ + if (ret >= BQ24257_IILIMIT_MAP_SIZE) + return -ENODATA; + + val->intval = bq24257_iilimit_map[ret]; + + return 0; +} + +static int bq24257_set_input_current_limit(struct bq24257_device *bq, + const union power_supply_propval *val) +{ + /* + * Address the case where the user manually sets an input current limit + * while the charger auto-detection mechanism is active. In this + * case we want to abort and go straight to the user-specified value. + */ + if (bq->iilimit_autoset_enable) + cancel_delayed_work_sync(&bq->iilimit_setup_work); + + return bq24257_field_write(bq, F_IILIMIT, + bq24257_find_idx(val->intval, + bq24257_iilimit_map, + BQ24257_IILIMIT_MAP_SIZE)); +} + +static int bq24257_power_supply_get_property(struct power_supply *psy, + enum power_supply_property psp, + union power_supply_propval *val) +{ + struct bq24257_device *bq = power_supply_get_drvdata(psy); + struct bq24257_state state; + + mutex_lock(&bq->lock); + state = bq->state; + mutex_unlock(&bq->lock); + + switch (psp) { + case POWER_SUPPLY_PROP_STATUS: + if (!state.power_good) + val->intval = POWER_SUPPLY_STATUS_DISCHARGING; + else if (state.status == STATUS_READY) + val->intval = POWER_SUPPLY_STATUS_NOT_CHARGING; + else if (state.status == STATUS_CHARGE_IN_PROGRESS) + val->intval = POWER_SUPPLY_STATUS_CHARGING; + else if (state.status == STATUS_CHARGE_DONE) + val->intval = POWER_SUPPLY_STATUS_FULL; + else + val->intval = POWER_SUPPLY_STATUS_UNKNOWN; + break; + + case POWER_SUPPLY_PROP_MANUFACTURER: + val->strval = BQ24257_MANUFACTURER; + break; + + case POWER_SUPPLY_PROP_MODEL_NAME: + val->strval = bq2425x_chip_name[bq->chip]; + break; + + case POWER_SUPPLY_PROP_ONLINE: + val->intval = state.power_good; + break; + + case POWER_SUPPLY_PROP_HEALTH: + switch (state.fault) { + case FAULT_NORMAL: + val->intval = POWER_SUPPLY_HEALTH_GOOD; + break; + + case FAULT_INPUT_OVP: + case FAULT_BAT_OVP: + val->intval = POWER_SUPPLY_HEALTH_OVERVOLTAGE; + break; + + case FAULT_TS: + case FAULT_BAT_TS: + val->intval = POWER_SUPPLY_HEALTH_OVERHEAT; + break; + + case FAULT_TIMER: + val->intval = POWER_SUPPLY_HEALTH_SAFETY_TIMER_EXPIRE; + break; + + default: + val->intval = POWER_SUPPLY_HEALTH_UNSPEC_FAILURE; + break; + } + + break; + + case POWER_SUPPLY_PROP_CONSTANT_CHARGE_CURRENT: + val->intval = bq24257_ichg_map[bq->init_data.ichg]; + break; + + case POWER_SUPPLY_PROP_CONSTANT_CHARGE_CURRENT_MAX: + val->intval = bq24257_ichg_map[BQ24257_ICHG_MAP_SIZE - 1]; + break; + + case POWER_SUPPLY_PROP_CONSTANT_CHARGE_VOLTAGE: + val->intval = bq24257_vbat_map[bq->init_data.vbat]; + break; + + case POWER_SUPPLY_PROP_CONSTANT_CHARGE_VOLTAGE_MAX: + val->intval = bq24257_vbat_map[BQ24257_VBAT_MAP_SIZE - 1]; + break; + + case POWER_SUPPLY_PROP_CHARGE_TERM_CURRENT: + val->intval = bq24257_iterm_map[bq->init_data.iterm]; + break; + + case POWER_SUPPLY_PROP_INPUT_CURRENT_LIMIT: + return bq24257_get_input_current_limit(bq, val); + + default: + return -EINVAL; + } + + return 0; +} + +static int bq24257_power_supply_set_property(struct power_supply *psy, + enum power_supply_property prop, + const union power_supply_propval *val) +{ + struct bq24257_device *bq = power_supply_get_drvdata(psy); + + switch (prop) { + case POWER_SUPPLY_PROP_INPUT_CURRENT_LIMIT: + return bq24257_set_input_current_limit(bq, val); + default: + return -EINVAL; + } +} + +static int bq24257_power_supply_property_is_writeable(struct power_supply *psy, + enum power_supply_property psp) +{ + switch (psp) { + case POWER_SUPPLY_PROP_INPUT_CURRENT_LIMIT: + return true; + default: + return false; + } +} + +static int bq24257_get_chip_state(struct bq24257_device *bq, + struct bq24257_state *state) +{ + int ret; + + ret = bq24257_field_read(bq, F_STAT); + if (ret < 0) + return ret; + + state->status = ret; + + ret = bq24257_field_read(bq, F_FAULT); + if (ret < 0) + return ret; + + state->fault = ret; + + if (bq->pg) + state->power_good = !gpiod_get_value_cansleep(bq->pg); + else + /* + * If we have a chip without a dedicated power-good GPIO or + * some other explicit bit that would provide this information + * assume the power is good if there is no supply related + * fault - and not good otherwise. There is a possibility for + * other errors to mask that power in fact is not good but this + * is probably the best we can do here. + */ + switch (state->fault) { + case FAULT_INPUT_OVP: + case FAULT_INPUT_UVLO: + case FAULT_INPUT_LDO_LOW: + state->power_good = false; + break; + default: + state->power_good = true; + } + + return 0; +} + +static bool bq24257_state_changed(struct bq24257_device *bq, + struct bq24257_state *new_state) +{ + int ret; + + mutex_lock(&bq->lock); + ret = (bq->state.status != new_state->status || + bq->state.fault != new_state->fault || + bq->state.power_good != new_state->power_good); + mutex_unlock(&bq->lock); + + return ret; +} + +enum bq24257_loop_status { + LOOP_STATUS_NONE, + LOOP_STATUS_IN_DPM, + LOOP_STATUS_IN_CURRENT_LIMIT, + LOOP_STATUS_THERMAL, +}; + +enum bq24257_in_ilimit { + IILIMIT_100, + IILIMIT_150, + IILIMIT_500, + IILIMIT_900, + IILIMIT_1500, + IILIMIT_2000, + IILIMIT_EXT, + IILIMIT_NONE, +}; + +enum bq24257_vovp { + VOVP_6000, + VOVP_6500, + VOVP_7000, + VOVP_8000, + VOVP_9000, + VOVP_9500, + VOVP_10000, + VOVP_10500 +}; + +enum bq24257_vindpm { + VINDPM_4200, + VINDPM_4280, + VINDPM_4360, + VINDPM_4440, + VINDPM_4520, + VINDPM_4600, + VINDPM_4680, + VINDPM_4760 +}; + +enum bq24257_port_type { + PORT_TYPE_DCP, /* Dedicated Charging Port */ + PORT_TYPE_CDP, /* Charging Downstream Port */ + PORT_TYPE_SDP, /* Standard Downstream Port */ + PORT_TYPE_NON_STANDARD, +}; + +enum bq24257_safety_timer { + SAFETY_TIMER_45, + SAFETY_TIMER_360, + SAFETY_TIMER_540, + SAFETY_TIMER_NONE, +}; + +static int bq24257_iilimit_autoset(struct bq24257_device *bq) +{ + int loop_status; + int iilimit; + int port_type; + int ret; + const u8 new_iilimit[] = { + [PORT_TYPE_DCP] = IILIMIT_2000, + [PORT_TYPE_CDP] = IILIMIT_2000, + [PORT_TYPE_SDP] = IILIMIT_500, + [PORT_TYPE_NON_STANDARD] = IILIMIT_500 + }; + + ret = bq24257_field_read(bq, F_LOOP_STATUS); + if (ret < 0) + goto error; + + loop_status = ret; + + ret = bq24257_field_read(bq, F_IILIMIT); + if (ret < 0) + goto error; + + iilimit = ret; + + /* + * All USB ports should be able to handle 500mA. If not, DPM will lower + * the charging current to accommodate the power source. No need to set + * a lower IILIMIT value. + */ + if (loop_status == LOOP_STATUS_IN_DPM && iilimit == IILIMIT_500) + return 0; + + ret = bq24257_field_read(bq, F_USB_DET); + if (ret < 0) + goto error; + + port_type = ret; + + ret = bq24257_field_write(bq, F_IILIMIT, new_iilimit[port_type]); + if (ret < 0) + goto error; + + ret = bq24257_field_write(bq, F_TMR, SAFETY_TIMER_360); + if (ret < 0) + goto error; + + ret = bq24257_field_write(bq, F_CLR_VDP, 1); + if (ret < 0) + goto error; + + dev_dbg(bq->dev, "port/loop = %d/%d -> iilimit = %d\n", + port_type, loop_status, new_iilimit[port_type]); + + return 0; + +error: + dev_err(bq->dev, "%s: Error communicating with the chip.\n", __func__); + return ret; +} + +static void bq24257_iilimit_setup_work(struct work_struct *work) +{ + struct bq24257_device *bq = container_of(work, struct bq24257_device, + iilimit_setup_work.work); + + bq24257_iilimit_autoset(bq); +} + +static void bq24257_handle_state_change(struct bq24257_device *bq, + struct bq24257_state *new_state) +{ + int ret; + struct bq24257_state old_state; + + mutex_lock(&bq->lock); + old_state = bq->state; + mutex_unlock(&bq->lock); + + /* + * Handle BQ2425x state changes observing whether the D+/D- based input + * current limit autoset functionality is enabled. + */ + if (!new_state->power_good) { + dev_dbg(bq->dev, "Power removed\n"); + if (bq->iilimit_autoset_enable) { + cancel_delayed_work_sync(&bq->iilimit_setup_work); + + /* activate D+/D- port detection algorithm */ + ret = bq24257_field_write(bq, F_DPDM_EN, 1); + if (ret < 0) + goto error; + } + /* + * When power is removed always return to the default input + * current limit as configured during probe. + */ + ret = bq24257_field_write(bq, F_IILIMIT, bq->init_data.iilimit); + if (ret < 0) + goto error; + } else if (!old_state.power_good) { + dev_dbg(bq->dev, "Power inserted\n"); + + if (bq->iilimit_autoset_enable) + /* configure input current limit */ + schedule_delayed_work(&bq->iilimit_setup_work, + msecs_to_jiffies(BQ24257_ILIM_SET_DELAY)); + } else if (new_state->fault == FAULT_NO_BAT) { + dev_warn(bq->dev, "Battery removed\n"); + } else if (new_state->fault == FAULT_TIMER) { + dev_err(bq->dev, "Safety timer expired! Battery dead?\n"); + } + + return; + +error: + dev_err(bq->dev, "%s: Error communicating with the chip.\n", __func__); +} + +static irqreturn_t bq24257_irq_handler_thread(int irq, void *private) +{ + int ret; + struct bq24257_device *bq = private; + struct bq24257_state state; + + ret = bq24257_get_chip_state(bq, &state); + if (ret < 0) + return IRQ_HANDLED; + + if (!bq24257_state_changed(bq, &state)) + return IRQ_HANDLED; + + dev_dbg(bq->dev, "irq(state changed): status/fault/pg = %d/%d/%d\n", + state.status, state.fault, state.power_good); + + bq24257_handle_state_change(bq, &state); + + mutex_lock(&bq->lock); + bq->state = state; + mutex_unlock(&bq->lock); + + power_supply_changed(bq->charger); + + return IRQ_HANDLED; +} + +static int bq24257_hw_init(struct bq24257_device *bq) +{ + int ret; + int i; + struct bq24257_state state; + + const struct { + int field; + u32 value; + } init_data[] = { + {F_ICHG, bq->init_data.ichg}, + {F_VBAT, bq->init_data.vbat}, + {F_ITERM, bq->init_data.iterm}, + {F_VOVP, bq->init_data.vovp}, + {F_VINDPM, bq->init_data.vindpm}, + }; + + /* + * Disable the watchdog timer to prevent the IC from going back to + * default settings after 50 seconds of I2C inactivity. + */ + ret = bq24257_field_write(bq, F_WD_EN, 0); + if (ret < 0) + return ret; + + /* configure the charge currents and voltages */ + for (i = 0; i < ARRAY_SIZE(init_data); i++) { + ret = bq24257_field_write(bq, init_data[i].field, + init_data[i].value); + if (ret < 0) + return ret; + } + + ret = bq24257_get_chip_state(bq, &state); + if (ret < 0) + return ret; + + mutex_lock(&bq->lock); + bq->state = state; + mutex_unlock(&bq->lock); + + if (!bq->iilimit_autoset_enable) { + dev_dbg(bq->dev, "manually setting iilimit = %u\n", + bq->init_data.iilimit); + + /* program fixed input current limit */ + ret = bq24257_field_write(bq, F_IILIMIT, + bq->init_data.iilimit); + if (ret < 0) + return ret; + } else if (!state.power_good) + /* activate D+/D- detection algorithm */ + ret = bq24257_field_write(bq, F_DPDM_EN, 1); + else if (state.fault != FAULT_NO_BAT) + ret = bq24257_iilimit_autoset(bq); + + return ret; +} + +static enum power_supply_property bq24257_power_supply_props[] = { + POWER_SUPPLY_PROP_MANUFACTURER, + POWER_SUPPLY_PROP_MODEL_NAME, + POWER_SUPPLY_PROP_STATUS, + POWER_SUPPLY_PROP_ONLINE, + POWER_SUPPLY_PROP_HEALTH, + POWER_SUPPLY_PROP_CONSTANT_CHARGE_CURRENT, + POWER_SUPPLY_PROP_CONSTANT_CHARGE_CURRENT_MAX, + POWER_SUPPLY_PROP_CONSTANT_CHARGE_VOLTAGE, + POWER_SUPPLY_PROP_CONSTANT_CHARGE_VOLTAGE_MAX, + POWER_SUPPLY_PROP_CHARGE_TERM_CURRENT, + POWER_SUPPLY_PROP_INPUT_CURRENT_LIMIT, +}; + +static char *bq24257_charger_supplied_to[] = { + "main-battery", +}; + +static const struct power_supply_desc bq24257_power_supply_desc = { + .name = "bq24257-charger", + .type = POWER_SUPPLY_TYPE_USB, + .properties = bq24257_power_supply_props, + .num_properties = ARRAY_SIZE(bq24257_power_supply_props), + .get_property = bq24257_power_supply_get_property, + .set_property = bq24257_power_supply_set_property, + .property_is_writeable = bq24257_power_supply_property_is_writeable, +}; + +static ssize_t bq24257_show_ovp_voltage(struct device *dev, + struct device_attribute *attr, + char *buf) +{ + struct power_supply *psy = dev_get_drvdata(dev); + struct bq24257_device *bq = power_supply_get_drvdata(psy); + + return sysfs_emit(buf, "%u\n", bq24257_vovp_map[bq->init_data.vovp]); +} + +static ssize_t bq24257_show_in_dpm_voltage(struct device *dev, + struct device_attribute *attr, + char *buf) +{ + struct power_supply *psy = dev_get_drvdata(dev); + struct bq24257_device *bq = power_supply_get_drvdata(psy); + + return sysfs_emit(buf, "%u\n", bq24257_vindpm_map[bq->init_data.vindpm]); +} + +static ssize_t bq24257_sysfs_show_enable(struct device *dev, + struct device_attribute *attr, + char *buf) +{ + struct power_supply *psy = dev_get_drvdata(dev); + struct bq24257_device *bq = power_supply_get_drvdata(psy); + int ret; + + if (strcmp(attr->attr.name, "high_impedance_enable") == 0) + ret = bq24257_field_read(bq, F_HZ_MODE); + else if (strcmp(attr->attr.name, "sysoff_enable") == 0) + ret = bq24257_field_read(bq, F_SYSOFF); + else + return -EINVAL; + + if (ret < 0) + return ret; + + return sysfs_emit(buf, "%d\n", ret); +} + +static ssize_t bq24257_sysfs_set_enable(struct device *dev, + struct device_attribute *attr, + const char *buf, + size_t count) +{ + struct power_supply *psy = dev_get_drvdata(dev); + struct bq24257_device *bq = power_supply_get_drvdata(psy); + long val; + int ret; + + if (kstrtol(buf, 10, &val) < 0) + return -EINVAL; + + if (strcmp(attr->attr.name, "high_impedance_enable") == 0) + ret = bq24257_field_write(bq, F_HZ_MODE, (bool)val); + else if (strcmp(attr->attr.name, "sysoff_enable") == 0) + ret = bq24257_field_write(bq, F_SYSOFF, (bool)val); + else + return -EINVAL; + + if (ret < 0) + return ret; + + return count; +} + +static DEVICE_ATTR(ovp_voltage, S_IRUGO, bq24257_show_ovp_voltage, NULL); +static DEVICE_ATTR(in_dpm_voltage, S_IRUGO, bq24257_show_in_dpm_voltage, NULL); +static DEVICE_ATTR(high_impedance_enable, S_IWUSR | S_IRUGO, + bq24257_sysfs_show_enable, bq24257_sysfs_set_enable); +static DEVICE_ATTR(sysoff_enable, S_IWUSR | S_IRUGO, + bq24257_sysfs_show_enable, bq24257_sysfs_set_enable); + +static struct attribute *bq24257_charger_sysfs_attrs[] = { + &dev_attr_ovp_voltage.attr, + &dev_attr_in_dpm_voltage.attr, + &dev_attr_high_impedance_enable.attr, + &dev_attr_sysoff_enable.attr, + NULL, +}; + +ATTRIBUTE_GROUPS(bq24257_charger_sysfs); + +static int bq24257_power_supply_init(struct bq24257_device *bq) +{ + struct power_supply_config psy_cfg = { .drv_data = bq, }; + + psy_cfg.attr_grp = bq24257_charger_sysfs_groups; + psy_cfg.supplied_to = bq24257_charger_supplied_to; + psy_cfg.num_supplicants = ARRAY_SIZE(bq24257_charger_supplied_to); + + bq->charger = devm_power_supply_register(bq->dev, + &bq24257_power_supply_desc, + &psy_cfg); + + return PTR_ERR_OR_ZERO(bq->charger); +} + +static void bq24257_pg_gpio_probe(struct bq24257_device *bq) +{ + bq->pg = devm_gpiod_get_optional(bq->dev, BQ24257_PG_GPIO, GPIOD_IN); + + if (PTR_ERR(bq->pg) == -EPROBE_DEFER) { + dev_info(bq->dev, "probe retry requested for PG pin\n"); + return; + } else if (IS_ERR(bq->pg)) { + dev_err(bq->dev, "error probing PG pin\n"); + bq->pg = NULL; + return; + } + + if (bq->pg) + dev_dbg(bq->dev, "probed PG pin = %d\n", desc_to_gpio(bq->pg)); +} + +static int bq24257_fw_probe(struct bq24257_device *bq) +{ + int ret; + u32 property; + + /* Required properties */ + ret = device_property_read_u32(bq->dev, "ti,charge-current", &property); + if (ret < 0) + return ret; + + bq->init_data.ichg = bq24257_find_idx(property, bq24257_ichg_map, + BQ24257_ICHG_MAP_SIZE); + + ret = device_property_read_u32(bq->dev, "ti,battery-regulation-voltage", + &property); + if (ret < 0) + return ret; + + bq->init_data.vbat = bq24257_find_idx(property, bq24257_vbat_map, + BQ24257_VBAT_MAP_SIZE); + + ret = device_property_read_u32(bq->dev, "ti,termination-current", + &property); + if (ret < 0) + return ret; + + bq->init_data.iterm = bq24257_find_idx(property, bq24257_iterm_map, + BQ24257_ITERM_MAP_SIZE); + + /* Optional properties. If not provided use reasonable default. */ + ret = device_property_read_u32(bq->dev, "ti,current-limit", + &property); + if (ret < 0) { + bq->iilimit_autoset_enable = true; + + /* + * Explicitly set a default value which will be needed for + * devices that don't support the automatic setting of the input + * current limit through the charger type detection mechanism. + */ + bq->init_data.iilimit = IILIMIT_500; + } else + bq->init_data.iilimit = + bq24257_find_idx(property, + bq24257_iilimit_map, + BQ24257_IILIMIT_MAP_SIZE); + + ret = device_property_read_u32(bq->dev, "ti,ovp-voltage", + &property); + if (ret < 0) + bq->init_data.vovp = VOVP_6500; + else + bq->init_data.vovp = bq24257_find_idx(property, + bq24257_vovp_map, + BQ24257_VOVP_MAP_SIZE); + + ret = device_property_read_u32(bq->dev, "ti,in-dpm-voltage", + &property); + if (ret < 0) + bq->init_data.vindpm = VINDPM_4360; + else + bq->init_data.vindpm = + bq24257_find_idx(property, + bq24257_vindpm_map, + BQ24257_VINDPM_MAP_SIZE); + + return 0; +} + +static int bq24257_probe(struct i2c_client *client) +{ + const struct i2c_device_id *id = i2c_client_get_device_id(client); + struct i2c_adapter *adapter = client->adapter; + struct device *dev = &client->dev; + const struct acpi_device_id *acpi_id; + struct bq24257_device *bq; + int ret; + int i; + + if (!i2c_check_functionality(adapter, I2C_FUNC_SMBUS_BYTE_DATA)) { + dev_err(dev, "No support for SMBUS_BYTE_DATA\n"); + return -ENODEV; + } + + bq = devm_kzalloc(dev, sizeof(*bq), GFP_KERNEL); + if (!bq) + return -ENOMEM; + + bq->client = client; + bq->dev = dev; + + if (ACPI_HANDLE(dev)) { + acpi_id = acpi_match_device(dev->driver->acpi_match_table, + &client->dev); + if (!acpi_id) { + dev_err(dev, "Failed to match ACPI device\n"); + return -ENODEV; + } + bq->chip = (enum bq2425x_chip)acpi_id->driver_data; + } else { + bq->chip = (enum bq2425x_chip)id->driver_data; + } + + mutex_init(&bq->lock); + + bq->rmap = devm_regmap_init_i2c(client, &bq24257_regmap_config); + if (IS_ERR(bq->rmap)) { + dev_err(dev, "failed to allocate register map\n"); + return PTR_ERR(bq->rmap); + } + + for (i = 0; i < ARRAY_SIZE(bq24257_reg_fields); i++) { + const struct reg_field *reg_fields = bq24257_reg_fields; + + bq->rmap_fields[i] = devm_regmap_field_alloc(dev, bq->rmap, + reg_fields[i]); + if (IS_ERR(bq->rmap_fields[i])) { + dev_err(dev, "cannot allocate regmap field\n"); + return PTR_ERR(bq->rmap_fields[i]); + } + } + + i2c_set_clientdata(client, bq); + + if (!dev->platform_data) { + ret = bq24257_fw_probe(bq); + if (ret < 0) { + dev_err(dev, "Cannot read device properties.\n"); + return ret; + } + } else { + return -ENODEV; + } + + /* + * The BQ24250 doesn't support the D+/D- based charger type detection + * used for the automatic setting of the input current limit setting so + * explicitly disable that feature. + */ + if (bq->chip == BQ24250) + bq->iilimit_autoset_enable = false; + + if (bq->iilimit_autoset_enable) + INIT_DELAYED_WORK(&bq->iilimit_setup_work, + bq24257_iilimit_setup_work); + + /* + * The BQ24250 doesn't have a dedicated Power Good (PG) pin so let's + * not probe for it and instead use a SW-based approach to determine + * the PG state. We also use a SW-based approach for all other devices + * if the PG pin is either not defined or can't be probed. + */ + if (bq->chip != BQ24250) + bq24257_pg_gpio_probe(bq); + + if (PTR_ERR(bq->pg) == -EPROBE_DEFER) + return PTR_ERR(bq->pg); + else if (!bq->pg) + dev_info(bq->dev, "using SW-based power-good detection\n"); + + /* reset all registers to defaults */ + ret = bq24257_field_write(bq, F_RESET, 1); + if (ret < 0) + return ret; + + /* + * Put the RESET bit back to 0, in cache. For some reason the HW always + * returns 1 on this bit, so this is the only way to avoid resetting the + * chip every time we update another field in this register. + */ + ret = bq24257_field_write(bq, F_RESET, 0); + if (ret < 0) + return ret; + + ret = bq24257_hw_init(bq); + if (ret < 0) { + dev_err(dev, "Cannot initialize the chip.\n"); + return ret; + } + + ret = bq24257_power_supply_init(bq); + if (ret < 0) { + dev_err(dev, "Failed to register power supply\n"); + return ret; + } + + ret = devm_request_threaded_irq(dev, client->irq, NULL, + bq24257_irq_handler_thread, + IRQF_TRIGGER_FALLING | + IRQF_TRIGGER_RISING | IRQF_ONESHOT, + bq2425x_chip_name[bq->chip], bq); + if (ret) { + dev_err(dev, "Failed to request IRQ #%d\n", client->irq); + return ret; + } + + return 0; +} + +static void bq24257_remove(struct i2c_client *client) +{ + struct bq24257_device *bq = i2c_get_clientdata(client); + + if (bq->iilimit_autoset_enable) + cancel_delayed_work_sync(&bq->iilimit_setup_work); + + bq24257_field_write(bq, F_RESET, 1); /* reset to defaults */ +} + +#ifdef CONFIG_PM_SLEEP +static int bq24257_suspend(struct device *dev) +{ + struct bq24257_device *bq = dev_get_drvdata(dev); + int ret = 0; + + if (bq->iilimit_autoset_enable) + cancel_delayed_work_sync(&bq->iilimit_setup_work); + + /* reset all registers to default (and activate standalone mode) */ + ret = bq24257_field_write(bq, F_RESET, 1); + if (ret < 0) + dev_err(bq->dev, "Cannot reset chip to standalone mode.\n"); + + return ret; +} + +static int bq24257_resume(struct device *dev) +{ + int ret; + struct bq24257_device *bq = dev_get_drvdata(dev); + + ret = regcache_drop_region(bq->rmap, BQ24257_REG_1, BQ24257_REG_7); + if (ret < 0) + return ret; + + ret = bq24257_field_write(bq, F_RESET, 0); + if (ret < 0) + return ret; + + ret = bq24257_hw_init(bq); + if (ret < 0) { + dev_err(bq->dev, "Cannot init chip after resume.\n"); + return ret; + } + + /* signal userspace, maybe state changed while suspended */ + power_supply_changed(bq->charger); + + return 0; +} +#endif + +static const struct dev_pm_ops bq24257_pm = { + SET_SYSTEM_SLEEP_PM_OPS(bq24257_suspend, bq24257_resume) +}; + +static const struct i2c_device_id bq24257_i2c_ids[] = { + { "bq24250", BQ24250 }, + { "bq24251", BQ24251 }, + { "bq24257", BQ24257 }, + {}, +}; +MODULE_DEVICE_TABLE(i2c, bq24257_i2c_ids); + +static const struct of_device_id bq24257_of_match[] __maybe_unused = { + { .compatible = "ti,bq24250", }, + { .compatible = "ti,bq24251", }, + { .compatible = "ti,bq24257", }, + { }, +}; +MODULE_DEVICE_TABLE(of, bq24257_of_match); + +#ifdef CONFIG_ACPI +static const struct acpi_device_id bq24257_acpi_match[] = { + { "BQ242500", BQ24250 }, + { "BQ242510", BQ24251 }, + { "BQ242570", BQ24257 }, + {}, +}; +MODULE_DEVICE_TABLE(acpi, bq24257_acpi_match); +#endif + +static struct i2c_driver bq24257_driver = { + .driver = { + .name = "bq24257-charger", + .of_match_table = of_match_ptr(bq24257_of_match), + .acpi_match_table = ACPI_PTR(bq24257_acpi_match), + .pm = &bq24257_pm, + }, + .probe = bq24257_probe, + .remove = bq24257_remove, + .id_table = bq24257_i2c_ids, +}; +module_i2c_driver(bq24257_driver); + +MODULE_AUTHOR("Laurentiu Palcu "); +MODULE_DESCRIPTION("bq24257 charger driver"); +MODULE_LICENSE("GPL"); -- cgit v1.2.3