[linux-2.6-block.git] / drivers / power / supply / bq24735-charger.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/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;
	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_CHG_OPT,
				   BQ24735_CHG_OPT_CHARGE_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_CHG_OPT,
				   BQ24735_CHG_OPT_CHARGE_DISABLE,
				   BQ24735_CHG_OPT_CHARGE_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_CHG_OPT);
		if (ac < 0) {
			dev_dbg(&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 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,
				 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 (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;

		INIT_DELAYED_WORK(&charger->poll, bq24735_poll);
		schedule_delayed_work(&charger->poll,
				      msecs_to_jiffies(charger->poll_interval));
	}

	return 0;
}

static int bq24735_charger_remove(struct i2c_client *client)
{
	struct bq24735 *charger = i2c_get_clientdata(client);

	if (charger->poll_interval)
		cancel_delayed_work_sync(&charger->poll);

	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,
	.remove = bq24735_charger_remove,
	.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");
Commit	Line	Data
ce773992 DS	1	/*
	2	* Battery charger driver for TI BQ24735
	3	*
	4	* Copyright (c) 2013, NVIDIA CORPORATION. All rights reserved.
	5	*
	6	* This program is free software; you can redistribute it and/or modify
	7	* it under the terms of the GNU General Public License as published by
	8	* the Free Software Foundation;
	9	*
	10	* This program is distributed in the hope that it will be useful, but WITHOUT
	11	* ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
	12	* FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License for
	13	* more details.
	14	*
	15	* You should have received a copy of the GNU General Public License along
	16	* with this program; if not, write to the Free Software Foundation, Inc.,
	17	* 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301, USA.
	18	*/
	19
	20	#include <linux/err.h>
	21	#include <linux/gpio.h>
	22	#include <linux/i2c.h>
	23	#include <linux/init.h>
	24	#include <linux/interrupt.h>
	25	#include <linux/kernel.h>
	26	#include <linux/module.h>
	27	#include <linux/of.h>
c65a8b51	28	#include <linux/gpio/consumer.h>
ce773992 DS	29	#include <linux/power_supply.h>
	30	#include <linux/slab.h>
	31
	32	#include <linux/power/bq24735-charger.h>
	33
	34	#define BQ24735_CHG_OPT 0x12
	35	#define BQ24735_CHG_OPT_CHARGE_DISABLE (1 << 0)
	36	#define BQ24735_CHG_OPT_AC_PRESENT (1 << 4)
	37	#define BQ24735_CHARGE_CURRENT 0x14
	38	#define BQ24735_CHARGE_CURRENT_MASK 0x1fc0
	39	#define BQ24735_CHARGE_VOLTAGE 0x15
	40	#define BQ24735_CHARGE_VOLTAGE_MASK 0x7ff0
	41	#define BQ24735_INPUT_CURRENT 0x3f
	42	#define BQ24735_INPUT_CURRENT_MASK 0x1f80
	43	#define BQ24735_MANUFACTURER_ID 0xfe
	44	#define BQ24735_DEVICE_ID 0xff
	45
	46	struct bq24735 {
297d716f KK	47	struct power_supply *charger;
	48	struct power_supply_desc charger_desc;
	49	struct i2c_client *client;
	50	struct bq24735_platform *pdata;
5b7a0187	51	struct mutex lock;
c65a8b51	52	struct gpio_desc *status_gpio;
bf383fea PR	53	struct delayed_work poll;
bf383fea PR	54	u32 poll_interval;
5b7a0187	55	bool charging;
ce773992 DS	56	};
	57
	58	static inline struct bq24735 to_bq24735(struct power_supply psy)
	59	{
297d716f	60	return power_supply_get_drvdata(psy);
ce773992 DS	61	}
	62
	63	static enum power_supply_property bq24735_charger_properties[] = {
5b7a0187	64	POWER_SUPPLY_PROP_STATUS,
ce773992 DS	65	POWER_SUPPLY_PROP_ONLINE,
	66	};
	67
5b7a0187 PR	68	static int bq24735_charger_property_is_writeable(struct power_supply *psy,
	69	enum power_supply_property psp)
	70	{
	71	switch (psp) {
	72	case POWER_SUPPLY_PROP_STATUS:
	73	return 1;
	74	default:
	75	break;
	76	}
	77
	78	return 0;
	79	}
	80
ce773992 DS	81	static inline int bq24735_write_word(struct i2c_client *client, u8 reg,
	82	u16 value)
	83	{
48f680c0	84	return i2c_smbus_write_word_data(client, reg, value);
ce773992 DS	85	}
	86
	87	static inline int bq24735_read_word(struct i2c_client *client, u8 reg)
	88	{
48f680c0	89	return i2c_smbus_read_word_data(client, reg);
ce773992 DS	90	}
	91
	92	static int bq24735_update_word(struct i2c_client *client, u8 reg,
	93	u16 mask, u16 value)
	94	{
	95	unsigned int tmp;
	96	int ret;
	97
	98	ret = bq24735_read_word(client, reg);
	99	if (ret < 0)
	100	return ret;
	101
	102	tmp = ret & ~mask;
	103	tmp \|= value & mask;
	104
	105	return bq24735_write_word(client, reg, tmp);
	106	}
	107
ce773992 DS	108	static int bq24735_config_charger(struct bq24735 *charger)
	109	{
	110	struct bq24735_platform *pdata = charger->pdata;
	111	int ret;
	112	u16 value;
	113
64024ac7 JT	114	if (pdata->ext_control)
	115	return 0;
	116
ce773992 DS	117	if (pdata->charge_current) {
	118	value = pdata->charge_current & BQ24735_CHARGE_CURRENT_MASK;
	119
	120	ret = bq24735_write_word(charger->client,
	121	BQ24735_CHARGE_CURRENT, value);
	122	if (ret < 0) {
	123	dev_err(&charger->client->dev,
	124	"Failed to write charger current : %d\n",
	125	ret);
	126	return ret;
	127	}
	128	}
	129
	130	if (pdata->charge_voltage) {
	131	value = pdata->charge_voltage & BQ24735_CHARGE_VOLTAGE_MASK;
	132
	133	ret = bq24735_write_word(charger->client,
	134	BQ24735_CHARGE_VOLTAGE, value);
	135	if (ret < 0) {
	136	dev_err(&charger->client->dev,
	137	"Failed to write charger voltage : %d\n",
	138	ret);
	139	return ret;
	140	}
	141	}
	142
	143	if (pdata->input_current) {
	144	value = pdata->input_current & BQ24735_INPUT_CURRENT_MASK;
	145
	146	ret = bq24735_write_word(charger->client,
	147	BQ24735_INPUT_CURRENT, value);
	148	if (ret < 0) {
	149	dev_err(&charger->client->dev,
	150	"Failed to write input current : %d\n",
	151	ret);
	152	return ret;
	153	}
	154	}
	155
	156	return 0;
	157	}
	158
2e66585c PR	159	static inline int bq24735_enable_charging(struct bq24735 *charger)
2e66585c PR	160	{
a07bea32 PR	161	int ret;
a07bea32 PR	162
2e66585c PR	163	if (charger->pdata->ext_control)
	164	return 0;
	165
a07bea32 PR	166	ret = bq24735_config_charger(charger);
	167	if (ret)
	168	return ret;
	169
2e66585c PR	170	return bq24735_update_word(charger->client, BQ24735_CHG_OPT,
	171	BQ24735_CHG_OPT_CHARGE_DISABLE, 0);
	172	}
	173
	174	static inline int bq24735_disable_charging(struct bq24735 *charger)
	175	{
	176	if (charger->pdata->ext_control)
	177	return 0;
	178
	179	return bq24735_update_word(charger->client, BQ24735_CHG_OPT,
	180	BQ24735_CHG_OPT_CHARGE_DISABLE,
	181	BQ24735_CHG_OPT_CHARGE_DISABLE);
	182	}
	183
ce773992 DS	184	static bool bq24735_charger_is_present(struct bq24735 *charger)
ce773992 DS	185	{
c65a8b51 PK	186	if (charger->status_gpio) {
c65a8b51 PK	187	return !gpiod_get_value_cansleep(charger->status_gpio);
ce773992 DS	188	} else {
	189	int ac = 0;
	190
	191	ac = bq24735_read_word(charger->client, BQ24735_CHG_OPT);
	192	if (ac < 0) {
de4fb051	193	dev_dbg(&charger->client->dev,
ce773992 DS	194	"Failed to read charger options : %d\n",
	195	ac);
	196	return false;
	197	}
	198	return (ac & BQ24735_CHG_OPT_AC_PRESENT) ? true : false;
	199	}
	200
	201	return false;
	202	}
	203
5b7a0187 PR	204	static int bq24735_charger_is_charging(struct bq24735 *charger)
5b7a0187 PR	205	{
ae0f74be PK	206	int ret;
	207
	208	if (!bq24735_charger_is_present(charger))
	209	return 0;
5b7a0187	210
ae0f74be	211	ret = bq24735_read_word(charger->client, BQ24735_CHG_OPT);
5b7a0187 PR	212	if (ret < 0)
	213	return ret;
	214
	215	return !(ret & BQ24735_CHG_OPT_CHARGE_DISABLE);
	216	}
	217
bf383fea	218	static void bq24735_update(struct bq24735 *charger)
ce773992	219	{
5b7a0187 PR	220	mutex_lock(&charger->lock);
	221
	222	if (charger->charging && bq24735_charger_is_present(charger))
ce773992 DS	223	bq24735_enable_charging(charger);
	224	else
	225	bq24735_disable_charging(charger);
	226
5b7a0187 PR	227	mutex_unlock(&charger->lock);
5b7a0187 PR	228
bf383fea PR	229	power_supply_changed(charger->charger);
	230	}
	231
	232	static irqreturn_t bq24735_charger_isr(int irq, void *devid)
	233	{
	234	struct power_supply *psy = devid;
	235	struct bq24735 *charger = to_bq24735(psy);
	236
	237	bq24735_update(charger);
ce773992 DS	238
	239	return IRQ_HANDLED;
	240	}
	241
bf383fea PR	242	static void bq24735_poll(struct work_struct *work)
	243	{
	244	struct bq24735 *charger = container_of(work, struct bq24735, poll.work);
	245
	246	bq24735_update(charger);
	247
	248	schedule_delayed_work(&charger->poll,
	249	msecs_to_jiffies(charger->poll_interval));
	250	}
	251
ce773992 DS	252	static int bq24735_charger_get_property(struct power_supply *psy,
	253	enum power_supply_property psp,
	254	union power_supply_propval *val)
	255	{
297d716f	256	struct bq24735 *charger = to_bq24735(psy);
ce773992 DS	257
	258	switch (psp) {
	259	case POWER_SUPPLY_PROP_ONLINE:
	260	val->intval = bq24735_charger_is_present(charger) ? 1 : 0;
	261	break;
5b7a0187 PR	262	case POWER_SUPPLY_PROP_STATUS:
	263	switch (bq24735_charger_is_charging(charger)) {
	264	case 1:
	265	val->intval = POWER_SUPPLY_STATUS_CHARGING;
	266	break;
	267	case 0:
	268	val->intval = POWER_SUPPLY_STATUS_NOT_CHARGING;
	269	break;
	270	default:
	271	val->intval = POWER_SUPPLY_STATUS_UNKNOWN;
	272	break;
	273	}
	274	break;
ce773992 DS	275	default:
	276	return -EINVAL;
	277	}
	278
	279	return 0;
	280	}
	281
5b7a0187 PR	282	static int bq24735_charger_set_property(struct power_supply *psy,
	283	enum power_supply_property psp,
	284	const union power_supply_propval *val)
	285	{
	286	struct bq24735 *charger = to_bq24735(psy);
	287	int ret;
	288
	289	switch (psp) {
	290	case POWER_SUPPLY_PROP_STATUS:
	291	switch (val->intval) {
	292	case POWER_SUPPLY_STATUS_CHARGING:
	293	mutex_lock(&charger->lock);
	294	charger->charging = true;
	295	ret = bq24735_enable_charging(charger);
	296	mutex_unlock(&charger->lock);
	297	if (ret)
	298	return ret;
5b7a0187 PR	299	break;
	300	case POWER_SUPPLY_STATUS_DISCHARGING:
	301	case POWER_SUPPLY_STATUS_NOT_CHARGING:
	302	mutex_lock(&charger->lock);
	303	charger->charging = false;
	304	ret = bq24735_disable_charging(charger);
	305	mutex_unlock(&charger->lock);
	306	if (ret)
	307	return ret;
	308	break;
	309	default:
	310	return -EINVAL;
	311	}
	312	power_supply_changed(psy);
	313	break;
	314	default:
	315	return -EPERM;
	316	}
	317
	318	return 0;
	319	}
	320
ce773992 DS	321	static struct bq24735_platform bq24735_parse_dt_data(struct i2c_client client)
	322	{
	323	struct bq24735_platform *pdata;
	324	struct device_node *np = client->dev.of_node;
	325	u32 val;
	326	int ret;
ce773992 DS	327
	328	pdata = devm_kzalloc(&client->dev, sizeof(*pdata), GFP_KERNEL);
	329	if (!pdata) {
	330	dev_err(&client->dev,
	331	"Memory alloc for bq24735 pdata failed\n");
	332	return NULL;
	333	}
	334
ce773992 DS	335	ret = of_property_read_u32(np, "ti,charge-current", &val);
	336	if (!ret)
	337	pdata->charge_current = val;
	338
	339	ret = of_property_read_u32(np, "ti,charge-voltage", &val);
	340	if (!ret)
	341	pdata->charge_voltage = val;
	342
	343	ret = of_property_read_u32(np, "ti,input-current", &val);
	344	if (!ret)
	345	pdata->input_current = val;
	346
64024ac7 JT	347	pdata->ext_control = of_property_read_bool(np, "ti,external-control");
64024ac7 JT	348
ce773992 DS	349	return pdata;
	350	}
	351
	352	static int bq24735_charger_probe(struct i2c_client *client,
	353	const struct i2c_device_id *id)
	354	{
	355	int ret;
	356	struct bq24735 *charger;
297d716f	357	struct power_supply_desc *supply_desc;
2dc9215d	358	struct power_supply_config psy_cfg = {};
ce773992 DS	359	char *name;
	360
	361	charger = devm_kzalloc(&client->dev, sizeof(*charger), GFP_KERNEL);
	362	if (!charger)
	363	return -ENOMEM;
	364
5b7a0187 PR	365	mutex_init(&charger->lock);
5b7a0187 PR	366	charger->charging = true;
ce773992 DS	367	charger->pdata = client->dev.platform_data;
	368
	369	if (IS_ENABLED(CONFIG_OF) && !charger->pdata && client->dev.of_node)
	370	charger->pdata = bq24735_parse_dt_data(client);
	371
	372	if (!charger->pdata) {
	373	dev_err(&client->dev, "no platform data provided\n");
	374	return -EINVAL;
	375	}
	376
	377	name = (char *)charger->pdata->name;
	378	if (!name) {
71a5a508 VT	379	name = devm_kasprintf(&client->dev, GFP_KERNEL,
	380	"bq24735@%s",
	381	dev_name(&client->dev));
ce773992 DS	382	if (!name) {
	383	dev_err(&client->dev, "Failed to alloc device name\n");
	384	return -ENOMEM;
	385	}
	386	}
	387
	388	charger->client = client;
	389
297d716f	390	supply_desc = &charger->charger_desc;
ce773992	391
297d716f KK	392	supply_desc->name = name;
	393	supply_desc->type = POWER_SUPPLY_TYPE_MAINS;
	394	supply_desc->properties = bq24735_charger_properties;
	395	supply_desc->num_properties = ARRAY_SIZE(bq24735_charger_properties);
	396	supply_desc->get_property = bq24735_charger_get_property;
5b7a0187 PR	397	supply_desc->set_property = bq24735_charger_set_property;
	398	supply_desc->property_is_writeable =
	399	bq24735_charger_property_is_writeable;
2dc9215d KK	400
	401	psy_cfg.supplied_to = charger->pdata->supplied_to;
	402	psy_cfg.num_supplicants = charger->pdata->num_supplicants;
	403	psy_cfg.of_node = client->dev.of_node;
297d716f	404	psy_cfg.drv_data = charger;
ce773992 DS	405
	406	i2c_set_clientdata(client, charger);
	407
c65a8b51 PK	408	charger->status_gpio = devm_gpiod_get_optional(&client->dev,
	409	"ti,ac-detect",
	410	GPIOD_IN);
	411	if (IS_ERR(charger->status_gpio)) {
	412	ret = PTR_ERR(charger->status_gpio);
	413	dev_err(&client->dev, "Getting gpio failed: %d\n", ret);
	414	return ret;
ce773992 DS	415	}
ce773992 DS	416
a7d143d4	417	if (bq24735_charger_is_present(charger)) {
1a3adce1 JT	418	ret = bq24735_read_word(client, BQ24735_MANUFACTURER_ID);
	419	if (ret < 0) {
	420	dev_err(&client->dev, "Failed to read manufacturer id : %d\n",
	421	ret);
	422	return ret;
	423	} else if (ret != 0x0040) {
	424	dev_err(&client->dev,
	425	"manufacturer id mismatch. 0x0040 != 0x%04x\n", ret);
	426	return -ENODEV;
	427	}
	428
	429	ret = bq24735_read_word(client, BQ24735_DEVICE_ID);
	430	if (ret < 0) {
	431	dev_err(&client->dev, "Failed to read device id : %d\n", ret);
	432	return ret;
	433	} else if (ret != 0x000B) {
	434	dev_err(&client->dev,
	435	"device id mismatch. 0x000b != 0x%04x\n", ret);
	436	return -ENODEV;
	437	}
1a3adce1	438
ce773992 DS	439	ret = bq24735_enable_charging(charger);
	440	if (ret < 0) {
	441	dev_err(&client->dev, "Failed to enable charging\n");
71a5a508	442	return ret;
ce773992 DS	443	}
	444	}
	445
71a5a508 VT	446	charger->charger = devm_power_supply_register(&client->dev, supply_desc,
71a5a508 VT	447	&psy_cfg);
297d716f KK	448	if (IS_ERR(charger->charger)) {
297d716f KK	449	ret = PTR_ERR(charger->charger);
ce773992 DS	450	dev_err(&client->dev, "Failed to register power supply: %d\n",
ce773992 DS	451	ret);
71a5a508	452	return ret;
ce773992 DS	453	}
	454
	455	if (client->irq) {
	456	ret = devm_request_threaded_irq(&client->dev, client->irq,
	457	NULL, bq24735_charger_isr,
	458	IRQF_TRIGGER_RISING \|
	459	IRQF_TRIGGER_FALLING \|
	460	IRQF_ONESHOT,
297d716f KK	461	supply_desc->name,
297d716f KK	462	charger->charger);
ce773992 DS	463	if (ret) {
	464	dev_err(&client->dev,
	465	"Unable to register IRQ %d err %d\n",
	466	client->irq, ret);
71a5a508	467	return ret;
ce773992	468	}
dbff4c8e	469	} else {
bf383fea PR	470	ret = device_property_read_u32(&client->dev, "poll-interval",
	471	&charger->poll_interval);
	472	if (ret)
	473	return 0;
	474	if (!charger->poll_interval)
	475	return 0;
	476
	477	INIT_DELAYED_WORK(&charger->poll, bq24735_poll);
	478	schedule_delayed_work(&charger->poll,
	479	msecs_to_jiffies(charger->poll_interval));
ce773992 DS	480	}
ce773992 DS	481
ce773992 DS	482	return 0;
	483	}
	484
bf383fea PR	485	static int bq24735_charger_remove(struct i2c_client *client)
	486	{
	487	struct bq24735 *charger = i2c_get_clientdata(client);
	488
	489	if (charger->poll_interval)
	490	cancel_delayed_work_sync(&charger->poll);
	491
	492	return 0;
	493	}
	494
ce773992 DS	495	static const struct i2c_device_id bq24735_charger_id[] = {
	496	{ "bq24735-charger", 0 },
	497	{}
	498	};
	499	MODULE_DEVICE_TABLE(i2c, bq24735_charger_id);
	500
	501	static const struct of_device_id bq24735_match_ids[] = {
	502	{ .compatible = "ti,bq24735", },
	503	{ /* end */ }
	504	};
	505	MODULE_DEVICE_TABLE(of, bq24735_match_ids);
	506
	507	static struct i2c_driver bq24735_charger_driver = {
	508	.driver = {
	509	.name = "bq24735-charger",
ce773992 DS	510	.of_match_table = bq24735_match_ids,
	511	},
	512	.probe = bq24735_charger_probe,
bf383fea	513	.remove = bq24735_charger_remove,
ce773992 DS	514	.id_table = bq24735_charger_id,
	515	};
	516
	517	module_i2c_driver(bq24735_charger_driver);
	518
	519	MODULE_DESCRIPTION("bq24735 battery charging driver");
	520	MODULE_AUTHOR("Darbha Sriharsha <dsriharsha@nvidia.com>");
	521	MODULE_LICENSE("GPL v2");