517 lines
12 KiB
C
517 lines
12 KiB
C
|
/*
|
||
|
|
* Battery charger driver for TI BQ24735
|
||
|
|
*
|
||
|
|
* Copyright (c) 2013, NVIDIA CORPORATION. All rights reserved.
|
||
|
|
*
|
||
|
|
* 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;
|
||
|
|
*
|
||
|
|
* 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.
|
||
|
|
*
|
||
|
|
* You should have received a copy of the GNU General Public License along
|
||
|
|
* with this program; if not, write to the Free Software Foundation, Inc.,
|
||
|
|
* 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301, USA.
|
||
|
|
*/
|
||
|
|
|
||
|
|
#include <linux/devm-helpers.h>
|
||
|
|
#include <linux/err.h>
|
||
|
|
#include <linux/i2c.h>
|
||
|
|
#include <linux/init.h>
|
||
|
|
#include <linux/interrupt.h>
|
||
|
|
#include <linux/kernel.h>
|
||
|
|
#include <linux/module.h>
|
||
|
|
#include <linux/of.h>
|
||
|
|
#include <linux/gpio/consumer.h>
|
||
|
|
#include <linux/power_supply.h>
|
||
|
|
#include <linux/slab.h>
|
||
|
|
|
||
|
|
#include <linux/power/bq24735-charger.h>
|
||
|
|
|
||
|
|
/* BQ24735 available commands and their respective masks */
|
||
|
|
#define BQ24735_CHARGE_OPT 0x12
|
||
|
|
#define BQ24735_CHARGE_CURRENT 0x14
|
||
|
|
#define BQ24735_CHARGE_CURRENT_MASK 0x1fc0
|
||
|
|
#define BQ24735_CHARGE_VOLTAGE 0x15
|
||
|
|
#define BQ24735_CHARGE_VOLTAGE_MASK 0x7ff0
|
||
|
|
#define BQ24735_INPUT_CURRENT 0x3f
|
||
|
|
#define BQ24735_INPUT_CURRENT_MASK 0x1f80
|
||
|
|
#define BQ24735_MANUFACTURER_ID 0xfe
|
||
|
|
#define BQ24735_DEVICE_ID 0xff
|
||
|
|
|
||
|
|
/* ChargeOptions bits of interest */
|
||
|
|
#define BQ24735_CHARGE_OPT_CHG_DISABLE (1 << 0)
|
||
|
|
#define BQ24735_CHARGE_OPT_AC_PRESENT (1 << 4)
|
||
|
|
|
||
|
|
struct bq24735 {
|
||
|
|
struct power_supply *charger;
|
||
|
|
struct power_supply_desc charger_desc;
|
||
|
|
struct i2c_client *client;
|
||
|
|
struct bq24735_platform *pdata;
|
||
|
|
struct mutex lock;
|
||
|
|
struct gpio_desc *status_gpio;
|
||
|
|
struct delayed_work poll;
|
||
|
|
u32 poll_interval;
|
||
|
|
bool charging;
|
||
|
|
};
|
||
|
|
|
||
|
|
static inline struct bq24735 *to_bq24735(struct power_supply *psy)
|
||
|
|
{
|
||
|
|
return power_supply_get_drvdata(psy);
|
||
|
|
}
|
||
|
|
|
||
|
|
static enum power_supply_property bq24735_charger_properties[] = {
|
||
|
|
POWER_SUPPLY_PROP_STATUS,
|
||
|
|
POWER_SUPPLY_PROP_ONLINE,
|
||
|
|
};
|
||
|
|
|
||
|
|
static int bq24735_charger_property_is_writeable(struct power_supply *psy,
|
||
|
|
enum power_supply_property psp)
|
||
|
|
{
|
||
|
|
switch (psp) {
|
||
|
|
case POWER_SUPPLY_PROP_STATUS:
|
||
|
|
return 1;
|
||
|
|
default:
|
||
|
|
break;
|
||
|
|
}
|
||
|
|
|
||
|
|
return 0;
|
||
|
|
}
|
||
|
|
|
||
|
|
static inline int bq24735_write_word(struct i2c_client *client, u8 reg,
|
||
|
|
u16 value)
|
||
|
|
{
|
||
|
|
return i2c_smbus_write_word_data(client, reg, value);
|
||
|
|
}
|
||
|
|
|
||
|
|
static inline int bq24735_read_word(struct i2c_client *client, u8 reg)
|
||
|
|
{
|
||
|
|
return i2c_smbus_read_word_data(client, reg);
|
||
|
|
}
|
||
|
|
|
||
|
|
static int bq24735_update_word(struct i2c_client *client, u8 reg,
|
||
|
|
u16 mask, u16 value)
|
||
|
|
{
|
||
|
|
unsigned int tmp;
|
||
|
|
int ret;
|
||
|
|
|
||
|
|
ret = bq24735_read_word(client, reg);
|
||
|
|
if (ret < 0)
|
||
|
|
return ret;
|
||
|
|
|
||
|
|
tmp = ret & ~mask;
|
||
|
|
tmp |= value & mask;
|
||
|
|
|
||
|
|
return bq24735_write_word(client, reg, tmp);
|
||
|
|
}
|
||
|
|
|
||
|
|
static int bq24735_config_charger(struct bq24735 *charger)
|
||
|
|
{
|
||
|
|
struct bq24735_platform *pdata = charger->pdata;
|
||
|
|
int ret;
|
||
|
|
u16 value;
|
||
|
|
|
||
|
|
if (pdata->ext_control)
|
||
|
|
return 0;
|
||
|
|
|
||
|
|
if (pdata->charge_current) {
|
||
|
|
value = pdata->charge_current & BQ24735_CHARGE_CURRENT_MASK;
|
||
|
|
|
||
|
|
ret = bq24735_write_word(charger->client,
|
||
|
|
BQ24735_CHARGE_CURRENT, value);
|
||
|
|
if (ret < 0) {
|
||
|
|
dev_err(&charger->client->dev,
|
||
|
|
"Failed to write charger current : %d\n",
|
||
|
|
ret);
|
||
|
|
return ret;
|
||
|
|
}
|
||
|
|
}
|
||
|
|
|
||
|
|
if (pdata->charge_voltage) {
|
||
|
|
value = pdata->charge_voltage & BQ24735_CHARGE_VOLTAGE_MASK;
|
||
|
|
|
||
|
|
ret = bq24735_write_word(charger->client,
|
||
|
|
BQ24735_CHARGE_VOLTAGE, value);
|
||
|
|
if (ret < 0) {
|
||
|
|
dev_err(&charger->client->dev,
|
||
|
|
"Failed to write charger voltage : %d\n",
|
||
|
|
ret);
|
||
|
|
return ret;
|
||
|
|
}
|
||
|
|
}
|
||
|
|
|
||
|
|
if (pdata->input_current) {
|
||
|
|
value = pdata->input_current & BQ24735_INPUT_CURRENT_MASK;
|
||
|
|
|
||
|
|
ret = bq24735_write_word(charger->client,
|
||
|
|
BQ24735_INPUT_CURRENT, value);
|
||
|
|
if (ret < 0) {
|
||
|
|
dev_err(&charger->client->dev,
|
||
|
|
"Failed to write input current : %d\n",
|
||
|
|
ret);
|
||
|
|
return ret;
|
||
|
|
}
|
||
|
|
}
|
||
|
|
|
||
|
|
return 0;
|
||
|
|
}
|
||
|
|
|
||
|
|
static inline int bq24735_enable_charging(struct bq24735 *charger)
|
||
|
|
{
|
||
|
|
int ret;
|
||
|
|
|
||
|
|
if (charger->pdata->ext_control)
|
||
|
|
return 0;
|
||
|
|
|
||
|
|
ret = bq24735_config_charger(charger);
|
||
|
|
if (ret)
|
||
|
|
return ret;
|
||
|
|
|
||
|
|
return bq24735_update_word(charger->client, BQ24735_CHARGE_OPT,
|
||
|
|
BQ24735_CHARGE_OPT_CHG_DISABLE, 0);
|
||
|
|
}
|
||
|
|
|
||
|
|
static inline int bq24735_disable_charging(struct bq24735 *charger)
|
||
|
|
{
|
||
|
|
if (charger->pdata->ext_control)
|
||
|
|
return 0;
|
||
|
|
|
||
|
|
return bq24735_update_word(charger->client, BQ24735_CHARGE_OPT,
|
||
|
|
BQ24735_CHARGE_OPT_CHG_DISABLE,
|
||
|
|
BQ24735_CHARGE_OPT_CHG_DISABLE);
|
||
|
|
}
|
||
|
|
|
||
|
|
static bool bq24735_charger_is_present(struct bq24735 *charger)
|
||
|
|
{
|
||
|
|
if (charger->status_gpio) {
|
||
|
|
return !gpiod_get_value_cansleep(charger->status_gpio);
|
||
|
|
} else {
|
||
|
|
int ac = 0;
|
||
|
|
|
||
|
|
ac = bq24735_read_word(charger->client, BQ24735_CHARGE_OPT);
|
||
|
|
if (ac < 0) {
|
||
|
|
dev_dbg(&charger->client->dev,
|
||
|
|
"Failed to read charger options : %d\n",
|
||
|
|
ac);
|
||
|
|
return false;
|
||
|
|
}
|
||
|
|
return (ac & BQ24735_CHARGE_OPT_AC_PRESENT) ? true : false;
|
||
|
|
}
|
||
|
|
|
||
|
|
return false;
|
||
|
|
}
|
||
|
|
|
||
|
|
static int bq24735_charger_is_charging(struct bq24735 *charger)
|
||
|
|
{
|
||
|
|
int ret;
|
||
|
|
|
||
|
|
if (!bq24735_charger_is_present(charger))
|
||
|
|
return 0;
|
||
|
|
|
||
|
|
ret = bq24735_read_word(charger->client, BQ24735_CHARGE_OPT);
|
||
|
|
if (ret < 0)
|
||
|
|
return ret;
|
||
|
|
|
||
|
|
return !(ret & BQ24735_CHARGE_OPT_CHG_DISABLE);
|
||
|
|
}
|
||
|
|
|
||
|
|
static void bq24735_update(struct bq24735 *charger)
|
||
|
|
{
|
||
|
|
mutex_lock(&charger->lock);
|
||
|
|
|
||
|
|
if (charger->charging && bq24735_charger_is_present(charger))
|
||
|
|
bq24735_enable_charging(charger);
|
||
|
|
else
|
||
|
|
bq24735_disable_charging(charger);
|
||
|
|
|
||
|
|
mutex_unlock(&charger->lock);
|
||
|
|
|
||
|
|
power_supply_changed(charger->charger);
|
||
|
|
}
|
||
|
|
|
||
|
|
static irqreturn_t bq24735_charger_isr(int irq, void *devid)
|
||
|
|
{
|
||
|
|
struct power_supply *psy = devid;
|
||
|
|
struct bq24735 *charger = to_bq24735(psy);
|
||
|
|
|
||
|
|
bq24735_update(charger);
|
||
|
|
|
||
|
|
return IRQ_HANDLED;
|
||
|
|
}
|
||
|
|
|
||
|
|
static void bq24735_poll(struct work_struct *work)
|
||
|
|
{
|
||
|
|
struct bq24735 *charger = container_of(work, struct bq24735, poll.work);
|
||
|
|
|
||
|
|
bq24735_update(charger);
|
||
|
|
|
||
|
|
schedule_delayed_work(&charger->poll,
|
||
|
|
msecs_to_jiffies(charger->poll_interval));
|
||
|
|
}
|
||
|
|
|
||
|
|
static int bq24735_charger_get_property(struct power_supply *psy,
|
||
|
|
enum power_supply_property psp,
|
||
|
|
union power_supply_propval *val)
|
||
|
|
{
|
||
|
|
struct bq24735 *charger = to_bq24735(psy);
|
||
|
|
|
||
|
|
switch (psp) {
|
||
|
|
case POWER_SUPPLY_PROP_ONLINE:
|
||
|
|
val->intval = bq24735_charger_is_present(charger) ? 1 : 0;
|
||
|
|
break;
|
||
|
|
case POWER_SUPPLY_PROP_STATUS:
|
||
|
|
switch (bq24735_charger_is_charging(charger)) {
|
||
|
|
case 1:
|
||
|
|
val->intval = POWER_SUPPLY_STATUS_CHARGING;
|
||
|
|
break;
|
||
|
|
case 0:
|
||
|
|
val->intval = POWER_SUPPLY_STATUS_NOT_CHARGING;
|
||
|
|
break;
|
||
|
|
default:
|
||
|
|
val->intval = POWER_SUPPLY_STATUS_UNKNOWN;
|
||
|
|
break;
|
||
|
|
}
|
||
|
|
break;
|
||
|
|
default:
|
||
|
|
return -EINVAL;
|
||
|
|
}
|
||
|
|
|
||
|
|
return 0;
|
||
|
|
}
|
||
|
|
|
||
|
|
static int bq24735_charger_set_property(struct power_supply *psy,
|
||
|
|
enum power_supply_property psp,
|
||
|
|
const union power_supply_propval *val)
|
||
|
|
{
|
||
|
|
struct bq24735 *charger = to_bq24735(psy);
|
||
|
|
int ret;
|
||
|
|
|
||
|
|
switch (psp) {
|
||
|
|
case POWER_SUPPLY_PROP_STATUS:
|
||
|
|
switch (val->intval) {
|
||
|
|
case POWER_SUPPLY_STATUS_CHARGING:
|
||
|
|
mutex_lock(&charger->lock);
|
||
|
|
charger->charging = true;
|
||
|
|
ret = bq24735_enable_charging(charger);
|
||
|
|
mutex_unlock(&charger->lock);
|
||
|
|
if (ret)
|
||
|
|
return ret;
|
||
|
|
break;
|
||
|
|
case POWER_SUPPLY_STATUS_DISCHARGING:
|
||
|
|
case POWER_SUPPLY_STATUS_NOT_CHARGING:
|
||
|
|
mutex_lock(&charger->lock);
|
||
|
|
charger->charging = false;
|
||
|
|
ret = bq24735_disable_charging(charger);
|
||
|
|
mutex_unlock(&charger->lock);
|
||
|
|
if (ret)
|
||
|
|
return ret;
|
||
|
|
break;
|
||
|
|
default:
|
||
|
|
return -EINVAL;
|
||
|
|
}
|
||
|
|
power_supply_changed(psy);
|
||
|
|
break;
|
||
|
|
default:
|
||
|
|
return -EPERM;
|
||
|
|
}
|
||
|
|
|
||
|
|
return 0;
|
||
|
|
}
|
||
|
|
|
||
|
|
static struct bq24735_platform *bq24735_parse_dt_data(struct i2c_client *client)
|
||
|
|
{
|
||
|
|
struct bq24735_platform *pdata;
|
||
|
|
struct device_node *np = client->dev.of_node;
|
||
|
|
u32 val;
|
||
|
|
int ret;
|
||
|
|
|
||
|
|
pdata = devm_kzalloc(&client->dev, sizeof(*pdata), GFP_KERNEL);
|
||
|
|
if (!pdata) {
|
||
|
|
dev_err(&client->dev,
|
||
|
|
"Memory alloc for bq24735 pdata failed\n");
|
||
|
|
return NULL;
|
||
|
|
}
|
||
|
|
|
||
|
|
ret = of_property_read_u32(np, "ti,charge-current", &val);
|
||
|
|
if (!ret)
|
||
|
|
pdata->charge_current = val;
|
||
|
|
|
||
|
|
ret = of_property_read_u32(np, "ti,charge-voltage", &val);
|
||
|
|
if (!ret)
|
||
|
|
pdata->charge_voltage = val;
|
||
|
|
|
||
|
|
ret = of_property_read_u32(np, "ti,input-current", &val);
|
||
|
|
if (!ret)
|
||
|
|
pdata->input_current = val;
|
||
|
|
|
||
|
|
pdata->ext_control = of_property_read_bool(np, "ti,external-control");
|
||
|
|
|
||
|
|
return pdata;
|
||
|
|
}
|
||
|
|
|
||
|
|
static int bq24735_charger_probe(struct i2c_client *client)
|
||
|
|
{
|
||
|
|
int ret;
|
||
|
|
struct bq24735 *charger;
|
||
|
|
struct power_supply_desc *supply_desc;
|
||
|
|
struct power_supply_config psy_cfg = {};
|
||
|
|
char *name;
|
||
|
|
|
||
|
|
charger = devm_kzalloc(&client->dev, sizeof(*charger), GFP_KERNEL);
|
||
|
|
if (!charger)
|
||
|
|
return -ENOMEM;
|
||
|
|
|
||
|
|
mutex_init(&charger->lock);
|
||
|
|
charger->charging = true;
|
||
|
|
charger->pdata = client->dev.platform_data;
|
||
|
|
|
||
|
|
if (IS_ENABLED(CONFIG_OF) && !charger->pdata && client->dev.of_node)
|
||
|
|
charger->pdata = bq24735_parse_dt_data(client);
|
||
|
|
|
||
|
|
if (!charger->pdata) {
|
||
|
|
dev_err(&client->dev, "no platform data provided\n");
|
||
|
|
return -EINVAL;
|
||
|
|
}
|
||
|
|
|
||
|
|
name = (char *)charger->pdata->name;
|
||
|
|
if (!name) {
|
||
|
|
name = devm_kasprintf(&client->dev, GFP_KERNEL,
|
||
|
|
"bq24735@%s",
|
||
|
|
dev_name(&client->dev));
|
||
|
|
if (!name) {
|
||
|
|
dev_err(&client->dev, "Failed to alloc device name\n");
|
||
|
|
return -ENOMEM;
|
||
|
|
}
|
||
|
|
}
|
||
|
|
|
||
|
|
charger->client = client;
|
||
|
|
|
||
|
|
supply_desc = &charger->charger_desc;
|
||
|
|
|
||
|
|
supply_desc->name = name;
|
||
|
|
supply_desc->type = POWER_SUPPLY_TYPE_MAINS;
|
||
|
|
supply_desc->properties = bq24735_charger_properties;
|
||
|
|
supply_desc->num_properties = ARRAY_SIZE(bq24735_charger_properties);
|
||
|
|
supply_desc->get_property = bq24735_charger_get_property;
|
||
|
|
supply_desc->set_property = bq24735_charger_set_property;
|
||
|
|
supply_desc->property_is_writeable =
|
||
|
|
bq24735_charger_property_is_writeable;
|
||
|
|
|
||
|
|
psy_cfg.supplied_to = charger->pdata->supplied_to;
|
||
|
|
psy_cfg.num_supplicants = charger->pdata->num_supplicants;
|
||
|
|
psy_cfg.of_node = client->dev.of_node;
|
||
|
|
psy_cfg.drv_data = charger;
|
||
|
|
|
||
|
|
i2c_set_clientdata(client, charger);
|
||
|
|
|
||
|
|
charger->status_gpio = devm_gpiod_get_optional(&client->dev,
|
||
|
|
"ti,ac-detect",
|
||
|
|
GPIOD_IN);
|
||
|
|
if (IS_ERR(charger->status_gpio)) {
|
||
|
|
ret = PTR_ERR(charger->status_gpio);
|
||
|
|
dev_err(&client->dev, "Getting gpio failed: %d\n", ret);
|
||
|
|
return ret;
|
||
|
|
}
|
||
|
|
|
||
|
|
if (bq24735_charger_is_present(charger)) {
|
||
|
|
ret = bq24735_read_word(client, BQ24735_MANUFACTURER_ID);
|
||
|
|
if (ret < 0) {
|
||
|
|
dev_err(&client->dev, "Failed to read manufacturer id : %d\n",
|
||
|
|
ret);
|
||
|
|
return ret;
|
||
|
|
} else if (ret != 0x0040) {
|
||
|
|
dev_err(&client->dev,
|
||
|
|
"manufacturer id mismatch. 0x0040 != 0x%04x\n", ret);
|
||
|
|
return -ENODEV;
|
||
|
|
}
|
||
|
|
|
||
|
|
ret = bq24735_read_word(client, BQ24735_DEVICE_ID);
|
||
|
|
if (ret < 0) {
|
||
|
|
dev_err(&client->dev, "Failed to read device id : %d\n", ret);
|
||
|
|
return ret;
|
||
|
|
} else if (ret != 0x000B) {
|
||
|
|
dev_err(&client->dev,
|
||
|
|
"device id mismatch. 0x000b != 0x%04x\n", ret);
|
||
|
|
return -ENODEV;
|
||
|
|
}
|
||
|
|
|
||
|
|
ret = bq24735_enable_charging(charger);
|
||
|
|
if (ret < 0) {
|
||
|
|
dev_err(&client->dev, "Failed to enable charging\n");
|
||
|
|
return ret;
|
||
|
|
}
|
||
|
|
}
|
||
|
|
|
||
|
|
charger->charger = devm_power_supply_register(&client->dev, supply_desc,
|
||
|
|
&psy_cfg);
|
||
|
|
if (IS_ERR(charger->charger)) {
|
||
|
|
ret = PTR_ERR(charger->charger);
|
||
|
|
dev_err(&client->dev, "Failed to register power supply: %d\n",
|
||
|
|
ret);
|
||
|
|
return ret;
|
||
|
|
}
|
||
|
|
|
||
|
|
if (client->irq) {
|
||
|
|
ret = devm_request_threaded_irq(&client->dev, client->irq,
|
||
|
|
NULL, bq24735_charger_isr,
|
||
|
|
IRQF_TRIGGER_RISING |
|
||
|
|
IRQF_TRIGGER_FALLING |
|
||
|
|
IRQF_ONESHOT,
|
||
|
|
supply_desc->name,
|
||
|
|
charger->charger);
|
||
|
|
if (ret) {
|
||
|
|
dev_err(&client->dev,
|
||
|
|
"Unable to register IRQ %d err %d\n",
|
||
|
|
client->irq, ret);
|
||
|
|
return ret;
|
||
|
|
}
|
||
|
|
} else {
|
||
|
|
ret = device_property_read_u32(&client->dev, "poll-interval",
|
||
|
|
&charger->poll_interval);
|
||
|
|
if (ret)
|
||
|
|
return 0;
|
||
|
|
if (!charger->poll_interval)
|
||
|
|
return 0;
|
||
|
|
|
||
|
|
ret = devm_delayed_work_autocancel(&client->dev, &charger->poll,
|
||
|
|
bq24735_poll);
|
||
|
|
if (ret)
|
||
|
|
return ret;
|
||
|
|
|
||
|
|
schedule_delayed_work(&charger->poll,
|
||
|
|
msecs_to_jiffies(charger->poll_interval));
|
||
|
|
}
|
||
|
|
|
||
|
|
return 0;
|
||
|
|
}
|
||
|
|
|
||
|
|
static const struct i2c_device_id bq24735_charger_id[] = {
|
||
|
|
{ "bq24735-charger", 0 },
|
||
|
|
{}
|
||
|
|
};
|
||
|
|
MODULE_DEVICE_TABLE(i2c, bq24735_charger_id);
|
||
|
|
|
||
|
|
static const struct of_device_id bq24735_match_ids[] = {
|
||
|
|
{ .compatible = "ti,bq24735", },
|
||
|
|
{ /* end */ }
|
||
|
|
};
|
||
|
|
MODULE_DEVICE_TABLE(of, bq24735_match_ids);
|
||
|
|
|
||
|
|
static struct i2c_driver bq24735_charger_driver = {
|
||
|
|
.driver = {
|
||
|
|
.name = "bq24735-charger",
|
||
|
|
.of_match_table = bq24735_match_ids,
|
||
|
|
},
|
||
|
|
.probe_new = bq24735_charger_probe,
|
||
|
|
.id_table = bq24735_charger_id,
|
||
|
|
};
|
||
|
|
|
||
|
|
module_i2c_driver(bq24735_charger_driver);
|
||
|
|
|
||
|
|
MODULE_DESCRIPTION("bq24735 battery charging driver");
|
||
|
|
MODULE_AUTHOR("Darbha Sriharsha <dsriharsha@nvidia.com>");
|
||
|
|
MODULE_LICENSE("GPL v2");
|