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linux/drivers/power/bq24257_charger.c

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/*
* 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.
*
* Datasheets:
* http://www.ti.com/product/bq24250
* http://www.ti.com/product/bq24251
* http://www.ti.com/product/bq24257
*/
#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_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 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 scnprintf(buf, PAGE_SIZE, "%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 scnprintf(buf, PAGE_SIZE, "%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 scnprintf(buf, PAGE_SIZE, "%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_attr[] = {
&dev_attr_ovp_voltage.attr,
&dev_attr_in_dpm_voltage.attr,
&dev_attr_high_impedance_enable.attr,
&dev_attr_sysoff_enable.attr,
NULL,
};
static const struct attribute_group bq24257_attr_group = {
.attrs = bq24257_charger_attr,
};
static int bq24257_power_supply_init(struct bq24257_device *bq)
{
struct power_supply_config psy_cfg = { .drv_data = bq, };
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)
{
struct i2c_adapter *adapter = to_i2c_adapter(client->dev.parent);
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 = 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;
}
ret = bq24257_power_supply_init(bq);
if (ret < 0) {
dev_err(dev, "Failed to register power supply\n");
return ret;
}
ret = sysfs_create_group(&bq->charger->dev.kobj, &bq24257_attr_group);
if (ret < 0) {
dev_err(dev, "Can't create sysfs entries\n");
return ret;
}
return 0;
}
static int 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);
sysfs_remove_group(&bq->charger->dev.kobj, &bq24257_attr_group);
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;
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[] = {
{ .compatible = "ti,bq24250", },
{ .compatible = "ti,bq24251", },
{ .compatible = "ti,bq24257", },
{ },
};
MODULE_DEVICE_TABLE(of, bq24257_of_match);
static const struct acpi_device_id bq24257_acpi_match[] = {
{ "BQ242500", BQ24250 },
{ "BQ242510", BQ24251 },
{ "BQ242570", BQ24257 },
{},
};
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@intel.com>");
MODULE_DESCRIPTION("bq24257 charger driver");
MODULE_LICENSE("GPL");
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