diff options
Diffstat (limited to 'drivers/power/supply/bq25890_charger.c')
| -rw-r--r-- | drivers/power/supply/bq25890_charger.c | 994 |
1 files changed, 994 insertions, 0 deletions
diff --git a/drivers/power/supply/bq25890_charger.c b/drivers/power/supply/bq25890_charger.c new file mode 100644 index 0000000..f993a55 --- /dev/null +++ b/drivers/power/supply/bq25890_charger.c @@ -0,0 +1,994 @@ +/* + * TI BQ25890 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/usb/phy.h> + +#include <linux/acpi.h> +#include <linux/of.h> + +#define BQ25890_MANUFACTURER "Texas Instruments" +#define BQ25890_IRQ_PIN "bq25890_irq" + +#define BQ25890_ID 3 + +enum bq25890_fields { + F_EN_HIZ, F_EN_ILIM, F_IILIM, /* Reg00 */ + F_BHOT, F_BCOLD, F_VINDPM_OFS, /* Reg01 */ + F_CONV_START, F_CONV_RATE, F_BOOSTF, F_ICO_EN, + F_HVDCP_EN, F_MAXC_EN, F_FORCE_DPM, F_AUTO_DPDM_EN, /* Reg02 */ + F_BAT_LOAD_EN, F_WD_RST, F_OTG_CFG, F_CHG_CFG, F_SYSVMIN, /* Reg03 */ + F_PUMPX_EN, F_ICHG, /* Reg04 */ + F_IPRECHG, F_ITERM, /* Reg05 */ + F_VREG, F_BATLOWV, F_VRECHG, /* Reg06 */ + F_TERM_EN, F_STAT_DIS, F_WD, F_TMR_EN, F_CHG_TMR, + F_JEITA_ISET, /* Reg07 */ + F_BATCMP, F_VCLAMP, F_TREG, /* Reg08 */ + F_FORCE_ICO, F_TMR2X_EN, F_BATFET_DIS, F_JEITA_VSET, + F_BATFET_DLY, F_BATFET_RST_EN, F_PUMPX_UP, F_PUMPX_DN, /* Reg09 */ + F_BOOSTV, F_BOOSTI, /* Reg0A */ + F_VBUS_STAT, F_CHG_STAT, F_PG_STAT, F_SDP_STAT, F_VSYS_STAT, /* Reg0B */ + F_WD_FAULT, F_BOOST_FAULT, F_CHG_FAULT, F_BAT_FAULT, + F_NTC_FAULT, /* Reg0C */ + F_FORCE_VINDPM, F_VINDPM, /* Reg0D */ + F_THERM_STAT, F_BATV, /* Reg0E */ + F_SYSV, /* Reg0F */ + F_TSPCT, /* Reg10 */ + F_VBUS_GD, F_VBUSV, /* Reg11 */ + F_ICHGR, /* Reg12 */ + F_VDPM_STAT, F_IDPM_STAT, F_IDPM_LIM, /* Reg13 */ + F_REG_RST, F_ICO_OPTIMIZED, F_PN, F_TS_PROFILE, F_DEV_REV, /* Reg14 */ + + F_MAX_FIELDS +}; + +/* initial field values, converted to register values */ +struct bq25890_init_data { + u8 ichg; /* charge current */ + u8 vreg; /* regulation voltage */ + u8 iterm; /* termination current */ + u8 iprechg; /* precharge current */ + u8 sysvmin; /* minimum system voltage limit */ + u8 boostv; /* boost regulation voltage */ + u8 boosti; /* boost current limit */ + u8 boostf; /* boost frequency */ + u8 ilim_en; /* enable ILIM pin */ + u8 treg; /* thermal regulation threshold */ +}; + +struct bq25890_state { + u8 online; + u8 chrg_status; + u8 chrg_fault; + u8 vsys_status; + u8 boost_fault; + u8 bat_fault; +}; + +struct bq25890_device { + struct i2c_client *client; + struct device *dev; + struct power_supply *charger; + + struct usb_phy *usb_phy; + struct notifier_block usb_nb; + struct work_struct usb_work; + unsigned long usb_event; + + struct regmap *rmap; + struct regmap_field *rmap_fields[F_MAX_FIELDS]; + + int chip_id; + struct bq25890_init_data init_data; + struct bq25890_state state; + + struct mutex lock; /* protect state data */ +}; + +static const struct regmap_range bq25890_readonly_reg_ranges[] = { + regmap_reg_range(0x0b, 0x0c), + regmap_reg_range(0x0e, 0x13), +}; + +static const struct regmap_access_table bq25890_writeable_regs = { + .no_ranges = bq25890_readonly_reg_ranges, + .n_no_ranges = ARRAY_SIZE(bq25890_readonly_reg_ranges), +}; + +static const struct regmap_range bq25890_volatile_reg_ranges[] = { + regmap_reg_range(0x00, 0x00), + regmap_reg_range(0x09, 0x09), + regmap_reg_range(0x0b, 0x0c), + regmap_reg_range(0x0e, 0x14), +}; + +static const struct regmap_access_table bq25890_volatile_regs = { + .yes_ranges = bq25890_volatile_reg_ranges, + .n_yes_ranges = ARRAY_SIZE(bq25890_volatile_reg_ranges), +}; + +static const struct regmap_config bq25890_regmap_config = { + .reg_bits = 8, + .val_bits = 8, + + .max_register = 0x14, + .cache_type = REGCACHE_RBTREE, + + .wr_table = &bq25890_writeable_regs, + .volatile_table = &bq25890_volatile_regs, +}; + +static const struct reg_field bq25890_reg_fields[] = { + /* REG00 */ + [F_EN_HIZ] = REG_FIELD(0x00, 7, 7), + [F_EN_ILIM] = REG_FIELD(0x00, 6, 6), + [F_IILIM] = REG_FIELD(0x00, 0, 5), + /* REG01 */ + [F_BHOT] = REG_FIELD(0x01, 6, 7), + [F_BCOLD] = REG_FIELD(0x01, 5, 5), + [F_VINDPM_OFS] = REG_FIELD(0x01, 0, 4), + /* REG02 */ + [F_CONV_START] = REG_FIELD(0x02, 7, 7), + [F_CONV_RATE] = REG_FIELD(0x02, 6, 6), + [F_BOOSTF] = REG_FIELD(0x02, 5, 5), + [F_ICO_EN] = REG_FIELD(0x02, 4, 4), + [F_HVDCP_EN] = REG_FIELD(0x02, 3, 3), + [F_MAXC_EN] = REG_FIELD(0x02, 2, 2), + [F_FORCE_DPM] = REG_FIELD(0x02, 1, 1), + [F_AUTO_DPDM_EN] = REG_FIELD(0x02, 0, 0), + /* REG03 */ + [F_BAT_LOAD_EN] = REG_FIELD(0x03, 7, 7), + [F_WD_RST] = REG_FIELD(0x03, 6, 6), + [F_OTG_CFG] = REG_FIELD(0x03, 5, 5), + [F_CHG_CFG] = REG_FIELD(0x03, 4, 4), + [F_SYSVMIN] = REG_FIELD(0x03, 1, 3), + /* REG04 */ + [F_PUMPX_EN] = REG_FIELD(0x04, 7, 7), + [F_ICHG] = REG_FIELD(0x04, 0, 6), + /* REG05 */ + [F_IPRECHG] = REG_FIELD(0x05, 4, 7), + [F_ITERM] = REG_FIELD(0x05, 0, 3), + /* REG06 */ + [F_VREG] = REG_FIELD(0x06, 2, 7), + [F_BATLOWV] = REG_FIELD(0x06, 1, 1), + [F_VRECHG] = REG_FIELD(0x06, 0, 0), + /* REG07 */ + [F_TERM_EN] = REG_FIELD(0x07, 7, 7), + [F_STAT_DIS] = REG_FIELD(0x07, 6, 6), + [F_WD] = REG_FIELD(0x07, 4, 5), + [F_TMR_EN] = REG_FIELD(0x07, 3, 3), + [F_CHG_TMR] = REG_FIELD(0x07, 1, 2), + [F_JEITA_ISET] = REG_FIELD(0x07, 0, 0), + /* REG08 */ + [F_BATCMP] = REG_FIELD(0x08, 6, 7), + [F_VCLAMP] = REG_FIELD(0x08, 2, 4), + [F_TREG] = REG_FIELD(0x08, 0, 1), + /* REG09 */ + [F_FORCE_ICO] = REG_FIELD(0x09, 7, 7), + [F_TMR2X_EN] = REG_FIELD(0x09, 6, 6), + [F_BATFET_DIS] = REG_FIELD(0x09, 5, 5), + [F_JEITA_VSET] = REG_FIELD(0x09, 4, 4), + [F_BATFET_DLY] = REG_FIELD(0x09, 3, 3), + [F_BATFET_RST_EN] = REG_FIELD(0x09, 2, 2), + [F_PUMPX_UP] = REG_FIELD(0x09, 1, 1), + [F_PUMPX_DN] = REG_FIELD(0x09, 0, 0), + /* REG0A */ + [F_BOOSTV] = REG_FIELD(0x0A, 4, 7), + [F_BOOSTI] = REG_FIELD(0x0A, 0, 2), + /* REG0B */ + [F_VBUS_STAT] = REG_FIELD(0x0B, 5, 7), + [F_CHG_STAT] = REG_FIELD(0x0B, 3, 4), + [F_PG_STAT] = REG_FIELD(0x0B, 2, 2), + [F_SDP_STAT] = REG_FIELD(0x0B, 1, 1), + [F_VSYS_STAT] = REG_FIELD(0x0B, 0, 0), + /* REG0C */ + [F_WD_FAULT] = REG_FIELD(0x0C, 7, 7), + [F_BOOST_FAULT] = REG_FIELD(0x0C, 6, 6), + [F_CHG_FAULT] = REG_FIELD(0x0C, 4, 5), + [F_BAT_FAULT] = REG_FIELD(0x0C, 3, 3), + [F_NTC_FAULT] = REG_FIELD(0x0C, 0, 2), + /* REG0D */ + [F_FORCE_VINDPM] = REG_FIELD(0x0D, 7, 7), + [F_VINDPM] = REG_FIELD(0x0D, 0, 6), + /* REG0E */ + [F_THERM_STAT] = REG_FIELD(0x0E, 7, 7), + [F_BATV] = REG_FIELD(0x0E, 0, 6), + /* REG0F */ + [F_SYSV] = REG_FIELD(0x0F, 0, 6), + /* REG10 */ + [F_TSPCT] = REG_FIELD(0x10, 0, 6), + /* REG11 */ + [F_VBUS_GD] = REG_FIELD(0x11, 7, 7), + [F_VBUSV] = REG_FIELD(0x11, 0, 6), + /* REG12 */ + [F_ICHGR] = REG_FIELD(0x12, 0, 6), + /* REG13 */ + [F_VDPM_STAT] = REG_FIELD(0x13, 7, 7), + [F_IDPM_STAT] = REG_FIELD(0x13, 6, 6), + [F_IDPM_LIM] = REG_FIELD(0x13, 0, 5), + /* REG14 */ + [F_REG_RST] = REG_FIELD(0x14, 7, 7), + [F_ICO_OPTIMIZED] = REG_FIELD(0x14, 6, 6), + [F_PN] = REG_FIELD(0x14, 3, 5), + [F_TS_PROFILE] = REG_FIELD(0x14, 2, 2), + [F_DEV_REV] = REG_FIELD(0x14, 0, 1) +}; + +/* + * Most of the val -> idx conversions can be computed, given the minimum, + * maximum and the step between values. For the rest of conversions, we use + * lookup tables. + */ +enum bq25890_table_ids { + /* range tables */ + TBL_ICHG, + TBL_ITERM, + TBL_IPRECHG, + TBL_VREG, + TBL_BATCMP, + TBL_VCLAMP, + TBL_BOOSTV, + TBL_SYSVMIN, + + /* lookup tables */ + TBL_TREG, + TBL_BOOSTI, +}; + +/* Thermal Regulation Threshold lookup table, in degrees Celsius */ +static const u32 bq25890_treg_tbl[] = { 60, 80, 100, 120 }; + +#define BQ25890_TREG_TBL_SIZE ARRAY_SIZE(bq25890_treg_tbl) + +/* Boost mode current limit lookup table, in uA */ +static const u32 bq25890_boosti_tbl[] = { + 500000, 700000, 1100000, 1300000, 1600000, 1800000, 2100000, 2400000 +}; + +#define BQ25890_BOOSTI_TBL_SIZE ARRAY_SIZE(bq25890_boosti_tbl) + +struct bq25890_range { + u32 min; + u32 max; + u32 step; +}; + +struct bq25890_lookup { + const u32 *tbl; + u32 size; +}; + +static const union { + struct bq25890_range rt; + struct bq25890_lookup lt; +} bq25890_tables[] = { + /* range tables */ + [TBL_ICHG] = { .rt = {0, 5056000, 64000} }, /* uA */ + [TBL_ITERM] = { .rt = {64000, 1024000, 64000} }, /* uA */ + [TBL_VREG] = { .rt = {3840000, 4608000, 16000} }, /* uV */ + [TBL_BATCMP] = { .rt = {0, 140, 20} }, /* mOhm */ + [TBL_VCLAMP] = { .rt = {0, 224000, 32000} }, /* uV */ + [TBL_BOOSTV] = { .rt = {4550000, 5510000, 64000} }, /* uV */ + [TBL_SYSVMIN] = { .rt = {3000000, 3700000, 100000} }, /* uV */ + + /* lookup tables */ + [TBL_TREG] = { .lt = {bq25890_treg_tbl, BQ25890_TREG_TBL_SIZE} }, + [TBL_BOOSTI] = { .lt = {bq25890_boosti_tbl, BQ25890_BOOSTI_TBL_SIZE} } +}; + +static int bq25890_field_read(struct bq25890_device *bq, + enum bq25890_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 bq25890_field_write(struct bq25890_device *bq, + enum bq25890_fields field_id, u8 val) +{ + return regmap_field_write(bq->rmap_fields[field_id], val); +} + +static u8 bq25890_find_idx(u32 value, enum bq25890_table_ids id) +{ + u8 idx; + + if (id >= TBL_TREG) { + const u32 *tbl = bq25890_tables[id].lt.tbl; + u32 tbl_size = bq25890_tables[id].lt.size; + + for (idx = 1; idx < tbl_size && tbl[idx] <= value; idx++) + ; + } else { + const struct bq25890_range *rtbl = &bq25890_tables[id].rt; + u8 rtbl_size; + + rtbl_size = (rtbl->max - rtbl->min) / rtbl->step + 1; + + for (idx = 1; + idx < rtbl_size && (idx * rtbl->step + rtbl->min <= value); + idx++) + ; + } + + return idx - 1; +} + +static u32 bq25890_find_val(u8 idx, enum bq25890_table_ids id) +{ + const struct bq25890_range *rtbl; + + /* lookup table? */ + if (id >= TBL_TREG) + return bq25890_tables[id].lt.tbl[idx]; + + /* range table */ + rtbl = &bq25890_tables[id].rt; + + return (rtbl->min + idx * rtbl->step); +} + +enum bq25890_status { + STATUS_NOT_CHARGING, + STATUS_PRE_CHARGING, + STATUS_FAST_CHARGING, + STATUS_TERMINATION_DONE, +}; + +enum bq25890_chrg_fault { + CHRG_FAULT_NORMAL, + CHRG_FAULT_INPUT, + CHRG_FAULT_THERMAL_SHUTDOWN, + CHRG_FAULT_TIMER_EXPIRED, +}; + +static int bq25890_power_supply_get_property(struct power_supply *psy, + enum power_supply_property psp, + union power_supply_propval *val) +{ + int ret; + struct bq25890_device *bq = power_supply_get_drvdata(psy); + struct bq25890_state state; + + mutex_lock(&bq->lock); + state = bq->state; + mutex_unlock(&bq->lock); + + switch (psp) { + case POWER_SUPPLY_PROP_STATUS: + if (!state.online) + val->intval = POWER_SUPPLY_STATUS_DISCHARGING; + else if (state.chrg_status == STATUS_NOT_CHARGING) + val->intval = POWER_SUPPLY_STATUS_NOT_CHARGING; + else if (state.chrg_status == STATUS_PRE_CHARGING || + state.chrg_status == STATUS_FAST_CHARGING) + val->intval = POWER_SUPPLY_STATUS_CHARGING; + else if (state.chrg_status == STATUS_TERMINATION_DONE) + val->intval = POWER_SUPPLY_STATUS_FULL; + else + val->intval = POWER_SUPPLY_STATUS_UNKNOWN; + + break; + + case POWER_SUPPLY_PROP_MANUFACTURER: + val->strval = BQ25890_MANUFACTURER; + break; + + case POWER_SUPPLY_PROP_ONLINE: + val->intval = state.online; + break; + + case POWER_SUPPLY_PROP_HEALTH: + if (!state.chrg_fault && !state.bat_fault && !state.boost_fault) + val->intval = POWER_SUPPLY_HEALTH_GOOD; + else if (state.bat_fault) + val->intval = POWER_SUPPLY_HEALTH_OVERVOLTAGE; + else if (state.chrg_fault == CHRG_FAULT_TIMER_EXPIRED) + val->intval = POWER_SUPPLY_HEALTH_SAFETY_TIMER_EXPIRE; + else if (state.chrg_fault == CHRG_FAULT_THERMAL_SHUTDOWN) + val->intval = POWER_SUPPLY_HEALTH_OVERHEAT; + else + val->intval = POWER_SUPPLY_HEALTH_UNSPEC_FAILURE; + break; + + case POWER_SUPPLY_PROP_CONSTANT_CHARGE_CURRENT: + ret = bq25890_field_read(bq, F_ICHGR); /* read measured value */ + if (ret < 0) + return ret; + + /* converted_val = ADC_val * 50mA (table 10.3.19) */ + val->intval = ret * 50000; + break; + + case POWER_SUPPLY_PROP_CONSTANT_CHARGE_CURRENT_MAX: + val->intval = bq25890_tables[TBL_ICHG].rt.max; + break; + + case POWER_SUPPLY_PROP_CONSTANT_CHARGE_VOLTAGE: + if (!state.online) { + val->intval = 0; + break; + } + + ret = bq25890_field_read(bq, F_BATV); /* read measured value */ + if (ret < 0) + return ret; + + /* converted_val = 2.304V + ADC_val * 20mV (table 10.3.15) */ + val->intval = 2304000 + ret * 20000; + break; + + case POWER_SUPPLY_PROP_CONSTANT_CHARGE_VOLTAGE_MAX: + val->intval = bq25890_tables[TBL_VREG].rt.max; + break; + + case POWER_SUPPLY_PROP_CHARGE_TERM_CURRENT: + val->intval = bq25890_find_val(bq->init_data.iterm, TBL_ITERM); + break; + + default: + return -EINVAL; + } + + return 0; +} + +static int bq25890_get_chip_state(struct bq25890_device *bq, + struct bq25890_state *state) +{ + int i, ret; + + struct { + enum bq25890_fields id; + u8 *data; + } state_fields[] = { + {F_CHG_STAT, &state->chrg_status}, + {F_PG_STAT, &state->online}, + {F_VSYS_STAT, &state->vsys_status}, + {F_BOOST_FAULT, &state->boost_fault}, + {F_BAT_FAULT, &state->bat_fault}, + {F_CHG_FAULT, &state->chrg_fault} + }; + + for (i = 0; i < ARRAY_SIZE(state_fields); i++) { + ret = bq25890_field_read(bq, state_fields[i].id); + if (ret < 0) + return ret; + + *state_fields[i].data = ret; + } + + dev_dbg(bq->dev, "S:CHG/PG/VSYS=%d/%d/%d, F:CHG/BOOST/BAT=%d/%d/%d\n", + state->chrg_status, state->online, state->vsys_status, + state->chrg_fault, state->boost_fault, state->bat_fault); + + return 0; +} + +static bool bq25890_state_changed(struct bq25890_device *bq, + struct bq25890_state *new_state) +{ + struct bq25890_state old_state; + + mutex_lock(&bq->lock); + old_state = bq->state; + mutex_unlock(&bq->lock); + + return (old_state.chrg_status != new_state->chrg_status || + old_state.chrg_fault != new_state->chrg_fault || + old_state.online != new_state->online || + old_state.bat_fault != new_state->bat_fault || + old_state.boost_fault != new_state->boost_fault || + old_state.vsys_status != new_state->vsys_status); +} + +static void bq25890_handle_state_change(struct bq25890_device *bq, + struct bq25890_state *new_state) +{ + int ret; + struct bq25890_state old_state; + + mutex_lock(&bq->lock); + old_state = bq->state; + mutex_unlock(&bq->lock); + + if (!new_state->online) { /* power removed */ + /* disable ADC */ + ret = bq25890_field_write(bq, F_CONV_START, 0); + if (ret < 0) + goto error; + } else if (!old_state.online) { /* power inserted */ + /* enable ADC, to have control of charge current/voltage */ + ret = bq25890_field_write(bq, F_CONV_START, 1); + if (ret < 0) + goto error; + } + + return; + +error: + dev_err(bq->dev, "Error communicating with the chip.\n"); +} + +static irqreturn_t bq25890_irq_handler_thread(int irq, void *private) +{ + struct bq25890_device *bq = private; + int ret; + struct bq25890_state state; + + ret = bq25890_get_chip_state(bq, &state); + if (ret < 0) + goto handled; + + if (!bq25890_state_changed(bq, &state)) + goto handled; + + bq25890_handle_state_change(bq, &state); + + mutex_lock(&bq->lock); + bq->state = state; + mutex_unlock(&bq->lock); + + power_supply_changed(bq->charger); + +handled: + return IRQ_HANDLED; +} + +static int bq25890_chip_reset(struct bq25890_device *bq) +{ + int ret; + int rst_check_counter = 10; + + ret = bq25890_field_write(bq, F_REG_RST, 1); + if (ret < 0) + return ret; + + do { + ret = bq25890_field_read(bq, F_REG_RST); + if (ret < 0) + return ret; + + usleep_range(5, 10); + } while (ret == 1 && --rst_check_counter); + + if (!rst_check_counter) + return -ETIMEDOUT; + + return 0; +} + +static int bq25890_hw_init(struct bq25890_device *bq) +{ + int ret; + int i; + struct bq25890_state state; + + const struct { + enum bq25890_fields id; + u32 value; + } init_data[] = { + {F_ICHG, bq->init_data.ichg}, + {F_VREG, bq->init_data.vreg}, + {F_ITERM, bq->init_data.iterm}, + {F_IPRECHG, bq->init_data.iprechg}, + {F_SYSVMIN, bq->init_data.sysvmin}, + {F_BOOSTV, bq->init_data.boostv}, + {F_BOOSTI, bq->init_data.boosti}, + {F_BOOSTF, bq->init_data.boostf}, + {F_EN_ILIM, bq->init_data.ilim_en}, + {F_TREG, bq->init_data.treg} + }; + + ret = bq25890_chip_reset(bq); + if (ret < 0) + return ret; + + /* disable watchdog */ + ret = bq25890_field_write(bq, F_WD, 0); + if (ret < 0) + return ret; + + /* initialize currents/voltages and other parameters */ + for (i = 0; i < ARRAY_SIZE(init_data); i++) { + ret = bq25890_field_write(bq, init_data[i].id, + init_data[i].value); + if (ret < 0) + return ret; + } + + /* Configure ADC for continuous conversions. This does not enable it. */ + ret = bq25890_field_write(bq, F_CONV_RATE, 1); + if (ret < 0) + return ret; + + ret = bq25890_get_chip_state(bq, &state); + if (ret < 0) + return ret; + + mutex_lock(&bq->lock); + bq->state = state; + mutex_unlock(&bq->lock); + + return 0; +} + +static enum power_supply_property bq25890_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 *bq25890_charger_supplied_to[] = { + "main-battery", +}; + +static const struct power_supply_desc bq25890_power_supply_desc = { + .name = "bq25890-charger", + .type = POWER_SUPPLY_TYPE_USB, + .properties = bq25890_power_supply_props, + .num_properties = ARRAY_SIZE(bq25890_power_supply_props), + .get_property = bq25890_power_supply_get_property, +}; + +static int bq25890_power_supply_init(struct bq25890_device *bq) +{ + struct power_supply_config psy_cfg = { .drv_data = bq, }; + + psy_cfg.supplied_to = bq25890_charger_supplied_to; + psy_cfg.num_supplicants = ARRAY_SIZE(bq25890_charger_supplied_to); + + bq->charger = power_supply_register(bq->dev, &bq25890_power_supply_desc, + &psy_cfg); + + return PTR_ERR_OR_ZERO(bq->charger); +} + +static void bq25890_usb_work(struct work_struct *data) +{ + int ret; + struct bq25890_device *bq = + container_of(data, struct bq25890_device, usb_work); + + switch (bq->usb_event) { + case USB_EVENT_ID: + /* Enable boost mode */ + ret = bq25890_field_write(bq, F_OTG_CFG, 1); + if (ret < 0) + goto error; + break; + + case USB_EVENT_NONE: + /* Disable boost mode */ + ret = bq25890_field_write(bq, F_OTG_CFG, 0); + if (ret < 0) + goto error; + + power_supply_changed(bq->charger); + break; + } + + return; + +error: + dev_err(bq->dev, "Error switching to boost/charger mode.\n"); +} + +static int bq25890_usb_notifier(struct notifier_block *nb, unsigned long val, + void *priv) +{ + struct bq25890_device *bq = + container_of(nb, struct bq25890_device, usb_nb); + + bq->usb_event = val; + queue_work(system_power_efficient_wq, &bq->usb_work); + + return NOTIFY_OK; +} + +static int bq25890_irq_probe(struct bq25890_device *bq) +{ + struct gpio_desc *irq; + + irq = devm_gpiod_get_index(bq->dev, BQ25890_IRQ_PIN, 0, GPIOD_IN); + if (IS_ERR(irq)) { + dev_err(bq->dev, "Could not probe irq pin.\n"); + return PTR_ERR(irq); + } + + return gpiod_to_irq(irq); +} + +static int bq25890_fw_read_u32_props(struct bq25890_device *bq) +{ + int ret; + u32 property; + int i; + struct bq25890_init_data *init = &bq->init_data; + struct { + char *name; + bool optional; + enum bq25890_table_ids tbl_id; + u8 *conv_data; /* holds converted value from given property */ + } props[] = { + /* required properties */ + {"ti,charge-current", false, TBL_ICHG, &init->ichg}, + {"ti,battery-regulation-voltage", false, TBL_VREG, &init->vreg}, + {"ti,termination-current", false, TBL_ITERM, &init->iterm}, + {"ti,precharge-current", false, TBL_ITERM, &init->iprechg}, + {"ti,minimum-sys-voltage", false, TBL_SYSVMIN, &init->sysvmin}, + {"ti,boost-voltage", false, TBL_BOOSTV, &init->boostv}, + {"ti,boost-max-current", false, TBL_BOOSTI, &init->boosti}, + + /* optional properties */ + {"ti,thermal-regulation-threshold", true, TBL_TREG, &init->treg} + }; + + /* initialize data for optional properties */ + init->treg = 3; /* 120 degrees Celsius */ + + for (i = 0; i < ARRAY_SIZE(props); i++) { + ret = device_property_read_u32(bq->dev, props[i].name, + &property); + if (ret < 0) { + if (props[i].optional) + continue; + + return ret; + } + + *props[i].conv_data = bq25890_find_idx(property, + props[i].tbl_id); + } + + return 0; +} + +static int bq25890_fw_probe(struct bq25890_device *bq) +{ + int ret; + struct bq25890_init_data *init = &bq->init_data; + + ret = bq25890_fw_read_u32_props(bq); + if (ret < 0) + return ret; + + init->ilim_en = device_property_read_bool(bq->dev, "ti,use-ilim-pin"); + init->boostf = device_property_read_bool(bq->dev, "ti,boost-low-freq"); + + return 0; +} + +static int bq25890_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 bq25890_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, &bq25890_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(bq25890_reg_fields); i++) { + const struct reg_field *reg_fields = bq25890_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); + + bq->chip_id = bq25890_field_read(bq, F_PN); + if (bq->chip_id < 0) { + dev_err(dev, "Cannot read chip ID.\n"); + return bq->chip_id; + } + + if (bq->chip_id != BQ25890_ID) { + dev_err(dev, "Chip with ID=%d, not supported!\n", bq->chip_id); + return -ENODEV; + } + + if (!dev->platform_data) { + ret = bq25890_fw_probe(bq); + if (ret < 0) { + dev_err(dev, "Cannot read device properties.\n"); + return ret; + } + } else { + return -ENODEV; + } + + ret = bq25890_hw_init(bq); + if (ret < 0) { + dev_err(dev, "Cannot initialize the chip.\n"); + return ret; + } + + if (client->irq <= 0) + client->irq = bq25890_irq_probe(bq); + + if (client->irq < 0) { + dev_err(dev, "No irq resource found.\n"); + return client->irq; + } + + /* OTG reporting */ + bq->usb_phy = devm_usb_get_phy(dev, USB_PHY_TYPE_USB2); + if (!IS_ERR_OR_NULL(bq->usb_phy)) { + INIT_WORK(&bq->usb_work, bq25890_usb_work); + bq->usb_nb.notifier_call = bq25890_usb_notifier; + usb_register_notifier(bq->usb_phy, &bq->usb_nb); + } + + ret = devm_request_threaded_irq(dev, client->irq, NULL, + bq25890_irq_handler_thread, + IRQF_TRIGGER_FALLING | IRQF_ONESHOT, + BQ25890_IRQ_PIN, bq); + if (ret) + goto irq_fail; + + ret = bq25890_power_supply_init(bq); + if (ret < 0) { + dev_err(dev, "Failed to register power supply\n"); + goto irq_fail; + } + + return 0; + +irq_fail: + if (!IS_ERR_OR_NULL(bq->usb_phy)) + usb_unregister_notifier(bq->usb_phy, &bq->usb_nb); + + return ret; +} + +static int bq25890_remove(struct i2c_client *client) +{ + struct bq25890_device *bq = i2c_get_clientdata(client); + + power_supply_unregister(bq->charger); + + if (!IS_ERR_OR_NULL(bq->usb_phy)) + usb_unregister_notifier(bq->usb_phy, &bq->usb_nb); + + /* reset all registers to default values */ + bq25890_chip_reset(bq); + + return 0; +} + +#ifdef CONFIG_PM_SLEEP +static int bq25890_suspend(struct device *dev) +{ + struct bq25890_device *bq = dev_get_drvdata(dev); + + /* + * If charger is removed, while in suspend, make sure ADC is diabled + * since it consumes slightly more power. + */ + return bq25890_field_write(bq, F_CONV_START, 0); +} + +static int bq25890_resume(struct device *dev) +{ + int ret; + struct bq25890_state state; + struct bq25890_device *bq = dev_get_drvdata(dev); + + ret = bq25890_get_chip_state(bq, &state); + if (ret < 0) + return ret; + + mutex_lock(&bq->lock); + bq->state = state; + mutex_unlock(&bq->lock); + + /* Re-enable ADC only if charger is plugged in. */ + if (state.online) { + ret = bq25890_field_write(bq, F_CONV_START, 1); + if (ret < 0) + return ret; + } + + /* signal userspace, maybe state changed while suspended */ + power_supply_changed(bq->charger); + + return 0; +} +#endif + +static const struct dev_pm_ops bq25890_pm = { + SET_SYSTEM_SLEEP_PM_OPS(bq25890_suspend, bq25890_resume) +}; + +static const struct i2c_device_id bq25890_i2c_ids[] = { + { "bq25890", 0 }, + {}, +}; +MODULE_DEVICE_TABLE(i2c, bq25890_i2c_ids); + +static const struct of_device_id bq25890_of_match[] = { + { .compatible = "ti,bq25890", }, + { }, +}; +MODULE_DEVICE_TABLE(of, bq25890_of_match); + +static const struct acpi_device_id bq25890_acpi_match[] = { + {"BQ258900", 0}, + {}, +}; +MODULE_DEVICE_TABLE(acpi, bq25890_acpi_match); + +static struct i2c_driver bq25890_driver = { + .driver = { + .name = "bq25890-charger", + .of_match_table = of_match_ptr(bq25890_of_match), + .acpi_match_table = ACPI_PTR(bq25890_acpi_match), + .pm = &bq25890_pm, + }, + .probe = bq25890_probe, + .remove = bq25890_remove, + .id_table = bq25890_i2c_ids, +}; +module_i2c_driver(bq25890_driver); + +MODULE_AUTHOR("Laurentiu Palcu <laurentiu.palcu@intel.com>"); +MODULE_DESCRIPTION("bq25890 charger driver"); +MODULE_LICENSE("GPL"); |
