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linux/drivers/power/supply/bq24735-charger.c
Paul Kocialkowski c65a8b5112 power: supply: bq24735-charger: Request status GPIO with initial input setup 
This requests the status GPIO with initial input setup. It is required
to read the GPIO status at probe time and thus correctly avoid sending
I2C messages when AC is not plugged.

When requesting the GPIO without initial input setup, it always reads 0
which causes probe to fail as it assumes the charger is connected, sends
I2C messages and fails.

While at it, this switches the driver over to gpiod API.

Signed-off-by: Paul Kocialkowski <contact@paulk.fr>
Signed-off-by: Sebastian Reichel <sre@kernel.org>
2016-09-05 12:59:49 +02:00

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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/gpio/consumer.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;
struct mutex lock;
struct gpio_desc *status_gpio;
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, 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)
{
if (charger->pdata->ext_control)
return 0;
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)
{
if (charger->pdata->ext_control)
return 0;
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->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 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_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 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_CHG_OPT);
if (ret < 0)
return ret;
return !(ret & BQ24735_CHG_OPT_CHARGE_DISABLE);
}
static irqreturn_t bq24735_charger_isr(int irq, void *devid)
{
struct power_supply *psy = devid;
struct bq24735 *charger = to_bq24735(psy);
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(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;
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;
bq24735_config_charger(charger);
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,
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;
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 (!charger->status_gpio || 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_config_charger(charger);
if (ret < 0) {
dev_err(&client->dev, "failed in configuring charger");
return ret;
}
/* check for AC adapter presence */
if (bq24735_charger_is_present(charger)) {
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;
}
}
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 = 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");
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