Based on the datasheet found here: http://www.ti.com/lit/ds/symlink/bq24257.pdf Signed-off-by: Laurentiu Palcu <laurentiu.palcu@xxxxxxxxx> --- The driver was tested using an EVM [1], not with a final product. [1] http://www.ti.com/tool/bq24257evm-150 laurentiu .../devicetree/bindings/power/bq24257.txt | 21 + drivers/power/Kconfig | 7 + drivers/power/Makefile | 1 + drivers/power/bq24257_charger.c | 868 +++++++++++++++++++++ 4 files changed, 897 insertions(+) create mode 100644 Documentation/devicetree/bindings/power/bq24257.txt create mode 100644 drivers/power/bq24257_charger.c diff --git a/Documentation/devicetree/bindings/power/bq24257.txt b/Documentation/devicetree/bindings/power/bq24257.txt new file mode 100644 index 0000000..5c9d394 --- /dev/null +++ b/Documentation/devicetree/bindings/power/bq24257.txt @@ -0,0 +1,21 @@ +Binding for TI bq24257 Li-Ion Charger + +Required properties: +- compatible: Should contain one of the following: + * "ti,bq24257" +- reg: integer, i2c address of the device. +- ti,battery-regulation-voltage: integer, maximum charging voltage in uV. +- ti,charge-current: integer, maximum charging current in uA. +- ti,termination-current: integer, charge will be terminated when current in + constant-voltage phase drops below this value (in uA). + +Example: + +bq24257 { + compatible = "ti,bq24257"; + reg = <0x6a>; + + ti,battery-regulation-voltage = <4200000>; + ti,charge-current = <1000000>; + ti,termination-current = <50000>; +}; diff --git a/drivers/power/Kconfig b/drivers/power/Kconfig index 4091fb0..20352a7 100644 --- a/drivers/power/Kconfig +++ b/drivers/power/Kconfig @@ -388,6 +388,13 @@ config CHARGER_BQ24190 help Say Y to enable support for the TI BQ24190 battery charger. +config CHARGER_BQ24257 + tristate "TI BQ24257 battery charger driver" + depends on I2C && GPIOLIB + depends on REGMAP_I2C + help + Say Y to enable support for the TI BQ24257 battery charger. + config CHARGER_BQ24735 tristate "TI BQ24735 battery charger support" depends on I2C && GPIOLIB diff --git a/drivers/power/Makefile b/drivers/power/Makefile index b7b0181..19a1f41 100644 --- a/drivers/power/Makefile +++ b/drivers/power/Makefile @@ -58,6 +58,7 @@ obj-$(CONFIG_CHARGER_MAX8997) += max8997_charger.o obj-$(CONFIG_CHARGER_MAX8998) += max8998_charger.o obj-$(CONFIG_CHARGER_BQ2415X) += bq2415x_charger.o obj-$(CONFIG_CHARGER_BQ24190) += bq24190_charger.o +obj-$(CONFIG_CHARGER_BQ24257) += bq24257_charger.o obj-$(CONFIG_CHARGER_BQ24735) += bq24735-charger.o obj-$(CONFIG_POWER_AVS) += avs/ obj-$(CONFIG_CHARGER_SMB347) += smb347-charger.o diff --git a/drivers/power/bq24257_charger.c b/drivers/power/bq24257_charger.c new file mode 100644 index 0000000..58b9af1 --- /dev/null +++ b/drivers/power/bq24257_charger.c @@ -0,0 +1,868 @@ +/* + * TI BQ24257 charger driver + * + * Copyright (C) 2015 Intel Corporation + * + * 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 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/module.h> +#include <linux/i2c.h> +#include <linux/power_supply.h> +#include <linux/regmap.h> +#include <linux/types.h> +#include <linux/gpio/consumer.h> +#include <linux/interrupt.h> +#include <linux/delay.h> + +#include <linux/acpi.h> +#include <linux/of.h> + +#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_STAT_IRQ "stat" +#define BQ24257_PG_GPIO "pg" + +#define BQ24257_ILIM_SET_DELAY 1000 /* msec */ + +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_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 */ +}; + +struct bq24257_state { + u8 status; + u8 fault; + bool power_good; +}; + +struct bq24257_device { + struct i2c_client *client; + struct device *dev; + struct power_supply *charger; + struct power_supply_desc charger_desc; + + 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 */ +}; + +static bool bq24257_is_writeable_reg(struct device *dev, unsigned int reg) +{ + return true; +} + +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, + + .writeable_reg = bq24257_is_writeable_reg, + .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_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 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_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_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; + + default: + return -EINVAL; + } + + return 0; +} + +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; + + state->power_good = !gpiod_get_value_cansleep(bq->pg); + + 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_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; + bool reset_iilimit = false; + bool config_iilimit = false; + + mutex_lock(&bq->lock); + old_state = bq->state; + mutex_unlock(&bq->lock); + + if (!new_state->power_good) { /* power removed */ + 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; + + reset_iilimit = true; + } else if (!old_state.power_good) { /* power inserted */ + config_iilimit = true; + } else if (new_state->fault == FAULT_NO_BAT) { /* battery removed */ + cancel_delayed_work_sync(&bq->iilimit_setup_work); + + reset_iilimit = true; + } else if (old_state.fault == FAULT_NO_BAT) { /* battery connected */ + config_iilimit = true; + } else if (new_state->fault == FAULT_TIMER) { /* safety timer expired */ + dev_err(bq->dev, "Safety timer expired! Battery dead?\n"); + } + + if (reset_iilimit) { + ret = bq24257_field_write(bq, F_IILIMIT, IILIMIT_500); + if (ret < 0) + goto error; + } else if (config_iilimit) { + schedule_delayed_work(&bq->iilimit_setup_work, + msecs_to_jiffies(BQ24257_ILIM_SET_DELAY)); + } + + 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} + }; + + /* + * 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 (!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_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, +}; + +static char *bq24257_charger_supplied_to[] = { + "main-battery", +}; + +static int bq24257_power_supply_init(struct bq24257_device *bq) +{ + struct power_supply_config psy_cfg = { .drv_data = bq, }; + struct power_supply_desc *psy_desc = &bq->charger_desc; + + psy_desc->name = "bq24257-charger"; + psy_desc->type = POWER_SUPPLY_TYPE_USB; + psy_desc->properties = bq24257_power_supply_props; + psy_desc->num_properties = ARRAY_SIZE(bq24257_power_supply_props); + psy_desc->get_property = bq24257_power_supply_get_property; + + psy_cfg.supplied_to = bq24257_charger_supplied_to; + psy_cfg.num_supplicants = ARRAY_SIZE(bq24257_charger_supplied_to); + + bq->charger = power_supply_register(bq->dev, psy_desc, &psy_cfg); + if (IS_ERR(bq->charger)) + return PTR_ERR(bq->charger); + + return 0; +} + +static int bq24257_irq_probe(struct bq24257_device *bq) +{ + int ret; + struct gpio_desc *stat_irq; + + stat_irq = devm_gpiod_get_index(bq->dev, BQ24257_STAT_IRQ, 0); + if (IS_ERR(stat_irq)) { + dev_err(bq->dev, "could not probe stat_irq pin\n"); + return PTR_ERR(stat_irq); + } + + ret = gpiod_direction_input(stat_irq); + if (ret < 0) + return ret; + + return gpiod_to_irq(stat_irq); +} + +static int bq24257_pg_gpio_probe(struct bq24257_device *bq) +{ + bq->pg = devm_gpiod_get_index(bq->dev, BQ24257_PG_GPIO, 0); + if (IS_ERR(bq->pg)) { + dev_err(bq->dev, "could not probe PG pin\n"); + return PTR_ERR(bq->pg); + } + + return gpiod_direction_input(bq->pg); +} + +static int bq24257_fw_probe(struct bq24257_device *bq) +{ + int ret; + u32 property; + + 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); + + return 0; +} + +static int bq24257_probe(struct i2c_client *client, + const struct i2c_device_id *id) +{ + struct i2c_adapter *adapter = to_i2c_adapter(client->dev.parent); + struct device *dev = &client->dev; + 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; + + 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); + + INIT_DELAYED_WORK(&bq->iilimit_setup_work, bq24257_iilimit_setup_work); + + 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; + } + + /* we can only check Power Good status by probing the PG pin */ + ret = bq24257_pg_gpio_probe(bq); + if (ret < 0) + return ret; + + /* 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; + } + + if (client->irq <= 0) + client->irq = bq24257_irq_probe(bq); + + if (client->irq < 0) { + dev_err(dev, "no irq resource found\n"); + return client->irq; + } + + ret = devm_request_threaded_irq(dev, client->irq, NULL, + bq24257_irq_handler_thread, + IRQF_TRIGGER_FALLING | + IRQF_TRIGGER_RISING | IRQF_ONESHOT, + BQ24257_STAT_IRQ, bq); + if (ret) + return ret; + + ret = bq24257_power_supply_init(bq); + if (ret < 0) + dev_err(dev, "Failed to register power supply\n"); + + return ret; +} + +static int bq24257_remove(struct i2c_client *client) +{ + struct bq24257_device *bq = i2c_get_clientdata(client); + + cancel_delayed_work_sync(&bq->iilimit_setup_work); + + power_supply_unregister(bq->charger); + + bq24257_field_write(bq, F_RESET, 1); /* reset to defaults */ + + return 0; +} + +#ifdef CONFIG_PM_SLEEP +static int bq24257_suspend(struct device *dev) +{ + struct bq24257_device *bq = dev_get_drvdata(dev); + int ret = 0; + + 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[] = { + { "bq24257", 0 }, + {}, +}; +MODULE_DEVICE_TABLE(i2c, bq24257_i2c_ids); + +static const struct of_device_id bq24257_of_match[] = { + { .compatible = "ti,bq24257", }, + { }, +}; +MODULE_DEVICE_TABLE(of, bq24257_of_match); + +static const struct acpi_device_id bq24257_acpi_match[] = { + {"BQ242570", 0}, + {}, +}; +MODULE_DEVICE_TABLE(acpi, bq24257_acpi_match); + +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 <laurentiu.palcu@xxxxxxxxx>"); +MODULE_DESCRIPTION("bq24257 charger driver"); +MODULE_LICENSE("GPL"); -- 1.9.1 -- To unsubscribe from this list: send the line "unsubscribe devicetree" in the body of a message to majordomo@xxxxxxxxxxxxxxx More majordomo info at http://vger.kernel.org/majordomo-info.html
