linux/drivers/power/bq25890_charger.c
Uwe Kleine-König 0007fa362a power_supply: bq25890: use flags argument of devm_gpiod_get
Since 39b2bbe3d7 (gpio: add flags argument to gpiod_get*() functions)
which appeared in v3.17-rc1, the gpiod_get* functions take an additional
parameter that allows to specify direction and initial value for output.

Simplify driver accordingly. Furthermore this is one caller less that
stops us making the flags argument to gpiod_get*() mandatory.

Signed-off-by: Uwe Kleine-König <u.kleine-koenig@pengutronix.de>
Signed-off-by: Sebastian Reichel <sre@kernel.org>
2015-06-13 04:06:33 +02:00

995 lines
25 KiB
C

/*
* 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");