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/*
* 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/err.h>
#include <linux/gpio.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/of_gpio.h>
#include <linux/power_supply.h>
#include <linux/slab.h>
#include <linux/power/bq24735-charger.h>
#define BQ24735_CHG_OPT 0x12
#define BQ24735_CHG_OPT_CHARGE_DISABLE (1 << 0)
#define BQ24735_CHG_OPT_AC_PRESENT (1 << 4)
#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
struct bq24735 {
struct power_supply *charger;
struct power_supply_desc charger_desc;
struct i2c_client *client;
struct bq24735_platform *pdata;
};
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_ONLINE,
};
static inline int bq24735_write_word(struct i2c_client *client, u8 reg,
u16 value)
{
return i2c_smbus_write_word_data(client, reg, le16_to_cpu(value));
}
static inline int bq24735_read_word(struct i2c_client *client, u8 reg)
{
s32 ret = i2c_smbus_read_word_data(client, reg);
return ret < 0 ? ret : le16_to_cpu(ret);
}
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 inline int bq24735_enable_charging(struct bq24735 *charger)
{
return bq24735_update_word(charger->client, BQ24735_CHG_OPT,
BQ24735_CHG_OPT_CHARGE_DISABLE,
~BQ24735_CHG_OPT_CHARGE_DISABLE);
}
static inline int bq24735_disable_charging(struct bq24735 *charger)
{
return bq24735_update_word(charger->client, BQ24735_CHG_OPT,
BQ24735_CHG_OPT_CHARGE_DISABLE,
BQ24735_CHG_OPT_CHARGE_DISABLE);
}
static int bq24735_config_charger(struct bq24735 *charger)
{
struct bq24735_platform *pdata = charger->pdata;
int ret;
u16 value;
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 bool bq24735_charger_is_present(struct bq24735 *charger)
{
struct bq24735_platform *pdata = charger->pdata;
int ret;
if (pdata->status_gpio_valid) {
ret = gpio_get_value_cansleep(pdata->status_gpio);
return ret ^= pdata->status_gpio_active_low == 0;
} else {
int ac = 0;
ac = bq24735_read_word(charger->client, BQ24735_CHG_OPT);
if (ac < 0) {
dev_err(&charger->client->dev,
"Failed to read charger options : %d\n",
ac);
return false;
}
return (ac & BQ24735_CHG_OPT_AC_PRESENT) ? true : false;
}
return false;
}
static irqreturn_t bq24735_charger_isr(int irq, void *devid)
{
struct power_supply *psy = devid;
struct bq24735 *charger = to_bq24735(psy);
if (bq24735_charger_is_present(charger))
bq24735_enable_charging(charger);
else
bq24735_disable_charging(charger);
power_supply_changed(psy);
return IRQ_HANDLED;
}
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;
default:
return -EINVAL;
}
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;
enum of_gpio_flags flags;
pdata = devm_kzalloc(&client->dev, sizeof(*pdata), GFP_KERNEL);
if (!pdata) {
dev_err(&client->dev,
"Memory alloc for bq24735 pdata failed\n");
return NULL;
}
pdata->status_gpio = of_get_named_gpio_flags(np, "ti,ac-detect-gpios",
0, &flags);
if (flags & OF_GPIO_ACTIVE_LOW)
pdata->status_gpio_active_low = 1;
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;
return pdata;
}
static int bq24735_charger_probe(struct i2c_client *client,
const struct i2c_device_id *id)
{
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;
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->
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