[linux-2.6-block.git] / drivers / power / 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/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;
	struct mutex			lock;
	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)
{
	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 int bq24735_charger_is_charging(struct bq24735 *charger)
{
	int 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;
	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;

	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);

	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;
	}

	if (gpio_is_valid(charger->pdata->status_gpio)) {
		ret = devm_gpio_request(&client->dev,
					charger->pdata->status_gpio,
					name);
		if (ret) {
			dev_err(&client->dev,
				"Failed GPIO request for GPIO %d: %d\n",
				charger->pdata->status_gpio, ret);
		}

		charger->pdata->status_gpio_valid = !ret;
	}

	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");
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>
	28	#include <linux/of_gpio.h>
	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 PR	51	struct mutex lock;
5b7a0187 PR	52	bool charging;
ce773992 DS	53	};
	54
	55	static inline struct bq24735 to_bq24735(struct power_supply psy)
	56	{
297d716f	57	return power_supply_get_drvdata(psy);
ce773992 DS	58	}
	59
	60	static enum power_supply_property bq24735_charger_properties[] = {
5b7a0187	61	POWER_SUPPLY_PROP_STATUS,
ce773992 DS	62	POWER_SUPPLY_PROP_ONLINE,
	63	};
	64
5b7a0187 PR	65	static int bq24735_charger_property_is_writeable(struct power_supply *psy,
	66	enum power_supply_property psp)
	67	{
	68	switch (psp) {
	69	case POWER_SUPPLY_PROP_STATUS:
	70	return 1;
	71	default:
	72	break;
	73	}
	74
	75	return 0;
	76	}
	77
ce773992 DS	78	static inline int bq24735_write_word(struct i2c_client *client, u8 reg,
	79	u16 value)
	80	{
	81	return i2c_smbus_write_word_data(client, reg, le16_to_cpu(value));
	82	}
	83
	84	static inline int bq24735_read_word(struct i2c_client *client, u8 reg)
	85	{
	86	s32 ret = i2c_smbus_read_word_data(client, reg);
	87
	88	return ret < 0 ? ret : le16_to_cpu(ret);
	89	}
	90
	91	static int bq24735_update_word(struct i2c_client *client, u8 reg,
	92	u16 mask, u16 value)
	93	{
	94	unsigned int tmp;
	95	int ret;
	96
	97	ret = bq24735_read_word(client, reg);
	98	if (ret < 0)
	99	return ret;
	100
	101	tmp = ret & ~mask;
	102	tmp \|= value & mask;
	103
	104	return bq24735_write_word(client, reg, tmp);
	105	}
	106
	107	static inline int bq24735_enable_charging(struct bq24735 *charger)
	108	{
	109	return bq24735_update_word(charger->client, BQ24735_CHG_OPT,
	110	BQ24735_CHG_OPT_CHARGE_DISABLE,
	111	~BQ24735_CHG_OPT_CHARGE_DISABLE);
	112	}
	113
	114	static inline int bq24735_disable_charging(struct bq24735 *charger)
	115	{
	116	return bq24735_update_word(charger->client, BQ24735_CHG_OPT,
	117	BQ24735_CHG_OPT_CHARGE_DISABLE,
	118	BQ24735_CHG_OPT_CHARGE_DISABLE);
	119	}
	120
	121	static int bq24735_config_charger(struct bq24735 *charger)
	122	{
	123	struct bq24735_platform *pdata = charger->pdata;
	124	int ret;
	125	u16 value;
	126
	127	if (pdata->charge_current) {
	128	value = pdata->charge_current & BQ24735_CHARGE_CURRENT_MASK;
	129
	130	ret = bq24735_write_word(charger->client,
	131	BQ24735_CHARGE_CURRENT, value);
	132	if (ret < 0) {
	133	dev_err(&charger->client->dev,
	134	"Failed to write charger current : %d\n",
	135	ret);
	136	return ret;
	137	}
	138	}
	139
	140	if (pdata->charge_voltage) {
	141	value = pdata->charge_voltage & BQ24735_CHARGE_VOLTAGE_MASK;
142
143	ret = bq24735_write_word(charger->client,
144	BQ24735_CHARGE_VOLTAGE, value);
145	if (ret < 0) {
146	dev_err(&charger->client->dev,
147	"Failed to write charger voltage : %d\n",
148	ret);
149	return ret;
150	}
151	}
152
153	if (pdata->input_current) {
154	value = pdata->input_current & BQ24735_INPUT_CURRENT_MASK;
155
156	ret = bq24735_write_word(charger->client,
157	BQ24735_INPUT_CURRENT, value);
158	if (ret < 0) {
159	dev_err(&charger->client->dev,
160	"Failed to write input current : %d\n",
161	ret);
162	return ret;
163	}
164	}
165
166	return 0;
167	}
168
169	static bool bq24735_charger_is_present(struct bq24735 *charger)
170	{
171	struct bq24735_platform *pdata = charger->pdata;
172	int ret;
173
174	if (pdata->status_gpio_valid) {
175	ret = gpio_get_value_cansleep(pdata->status_gpio);
176	return ret ^= pdata->status_gpio_active_low == 0;
177	} else {
178	int ac = 0;
179
180	ac = bq24735_read_word(charger->client, BQ24735_CHG_OPT);
181	if (ac < 0) {
182	dev_err(&charger->client->dev,
183	"Failed to read charger options : %d\n",
184	ac);
185	return false;
186	}
187	return (ac & BQ24735_CHG_OPT_AC_PRESENT) ? true : false;
188	}
189
190	return false;
191	}
192
5b7a0187 PR	193	static int bq24735_charger_is_charging(struct bq24735 *charger)
	194	{
	195	int ret = bq24735_read_word(charger->client, BQ24735_CHG_OPT);
	196
	197	if (ret < 0)
	198	return ret;
	199
	200	return !(ret & BQ24735_CHG_OPT_CHARGE_DISABLE);
	201	}
	202
ce773992 DS	203	static irqreturn_t bq24735_charger_isr(int irq, void *devid)
	204	{
	205	struct power_supply *psy = devid;
	206	struct bq24735 *charger = to_bq24735(psy);
	207
5b7a0187 PR	208	mutex_lock(&charger->lock);
	209
	210	if (charger->charging && bq24735_charger_is_present(charger))
ce773992 DS	211	bq24735_enable_charging(charger);
	212	else
	213	bq24735_disable_charging(charger);
	214
5b7a0187 PR	215	mutex_unlock(&charger->lock);
5b7a0187 PR	216
ce773992 DS	217	power_supply_changed(psy);
	218
	219	return IRQ_HANDLED;
	220	}
	221
	222	static int bq24735_charger_get_property(struct power_supply *psy,
	223	enum power_supply_property psp,
	224	union power_supply_propval *val)
	225	{
297d716f	226	struct bq24735 *charger = to_bq24735(psy);
ce773992 DS	227
	228	switch (psp) {
	229	case POWER_SUPPLY_PROP_ONLINE:
	230	val->intval = bq24735_charger_is_present(charger) ? 1 : 0;
	231	break;
5b7a0187 PR	232	case POWER_SUPPLY_PROP_STATUS:
	233	switch (bq24735_charger_is_charging(charger)) {
	234	case 1:
	235	val->intval = POWER_SUPPLY_STATUS_CHARGING;
	236	break;
	237	case 0:
	238	val->intval = POWER_SUPPLY_STATUS_NOT_CHARGING;
	239	break;
	240	default:
	241	val->intval = POWER_SUPPLY_STATUS_UNKNOWN;
	242	break;
	243	}
	244	break;
ce773992 DS	245	default:
	246	return -EINVAL;
	247	}
	248
	249	return 0;
	250	}
	251
5b7a0187 PR	252	static int bq24735_charger_set_property(struct power_supply *psy,
	253	enum power_supply_property psp,
	254	const union power_supply_propval *val)
	255	{
	256	struct bq24735 *charger = to_bq24735(psy);
	257	int ret;
	258
	259	switch (psp) {
	260	case POWER_SUPPLY_PROP_STATUS:
	261	switch (val->intval) {
	262	case POWER_SUPPLY_STATUS_CHARGING:
	263	mutex_lock(&charger->lock);
	264	charger->charging = true;
	265	ret = bq24735_enable_charging(charger);
	266	mutex_unlock(&charger->lock);
	267	if (ret)
	268	return ret;
	269	bq24735_config_charger(charger);
	270	break;
	271	case POWER_SUPPLY_STATUS_DISCHARGING:
	272	case POWER_SUPPLY_STATUS_NOT_CHARGING:
	273	mutex_lock(&charger->lock);
	274	charger->charging = false;
	275	ret = bq24735_disable_charging(charger);
	276	mutex_unlock(&charger->lock);
	277	if (ret)
	278	return ret;
	279	break;
	280	default:
	281	return -EINVAL;
	282	}
	283	power_supply_changed(psy);
	284	break;
	285	default:
	286	return -EPERM;
	287	}
	288
	289	return 0;
	290	}
	291
ce773992 DS	292	static struct bq24735_platform bq24735_parse_dt_data(struct i2c_client client)
	293	{
	294	struct bq24735_platform *pdata;
	295	struct device_node *np = client->dev.of_node;
	296	u32 val;
	297	int ret;
	298	enum of_gpio_flags flags;
	299
	300	pdata = devm_kzalloc(&client->dev, sizeof(*pdata), GFP_KERNEL);
	301	if (!pdata) {
	302	dev_err(&client->dev,
	303	"Memory alloc for bq24735 pdata failed\n");
	304	return NULL;
	305	}
	306
	307	pdata->status_gpio = of_get_named_gpio_flags(np, "ti,ac-detect-gpios",
	308	0, &flags);
	309
	310	if (flags & OF_GPIO_ACTIVE_LOW)
	311	pdata->status_gpio_active_low = 1;
	312
	313	ret = of_property_read_u32(np, "ti,charge-current", &val);
	314	if (!ret)
	315	pdata->charge_current = val;
	316
	317	ret = of_property_read_u32(np, "ti,charge-voltage", &val);
	318	if (!ret)
	319	pdata->charge_voltage = val;
	320
	321	ret = of_property_read_u32(np, "ti,input-current", &val);
	322	if (!ret)
	323	pdata->input_current = val;
	324
	325	return pdata;
	326	}
	327
	328	static int bq24735_charger_probe(struct i2c_client *client,
	329	const struct i2c_device_id *id)
	330	{
	331	int ret;
	332	struct bq24735 *charger;
297d716f	333	struct power_supply_desc *supply_desc;
2dc9215d	334	struct power_supply_config psy_cfg = {};
ce773992 DS	335	char *name;
	336
	337	charger = devm_kzalloc(&client->dev, sizeof(*charger), GFP_KERNEL);
	338	if (!charger)
	339	return -ENOMEM;
	340
5b7a0187 PR	341	mutex_init(&charger->lock);
5b7a0187 PR	342	charger->charging = true;
ce773992 DS	343	charger->pdata = client->dev.platform_data;
	344
	345	if (IS_ENABLED(CONFIG_OF) && !charger->pdata && client->dev.of_node)
	346	charger->pdata = bq24735_parse_dt_data(client);
	347
	348	if (!charger->pdata) {
	349	dev_err(&client->dev, "no platform data provided\n");
	350	return -EINVAL;
	351	}
	352
	353	name = (char *)charger->pdata->name;
	354	if (!name) {
71a5a508 VT	355	name = devm_kasprintf(&client->dev, GFP_KERNEL,
	356	"bq24735@%s",
	357	dev_name(&client->dev));
ce773992 DS	358	if (!name) {
	359	dev_err(&client->dev, "Failed to alloc device name\n");
	360	return -ENOMEM;
	361	}
	362	}
	363
	364	charger->client = client;
	365
297d716f	366	supply_desc = &charger->charger_desc;
ce773992	367
297d716f KK	368	supply_desc->name = name;
	369	supply_desc->type = POWER_SUPPLY_TYPE_MAINS;
	370	supply_desc->properties = bq24735_charger_properties;
	371	supply_desc->num_properties = ARRAY_SIZE(bq24735_charger_properties);
	372	supply_desc->get_property = bq24735_charger_get_property;
5b7a0187 PR	373	supply_desc->set_property = bq24735_charger_set_property;
	374	supply_desc->property_is_writeable =
	375	bq24735_charger_property_is_writeable;
2dc9215d KK	376
	377	psy_cfg.supplied_to = charger->pdata->supplied_to;
	378	psy_cfg.num_supplicants = charger->pdata->num_supplicants;
	379	psy_cfg.of_node = client->dev.of_node;
297d716f	380	psy_cfg.drv_data = charger;
ce773992 DS	381
	382	i2c_set_clientdata(client, charger);
	383
	384	ret = bq24735_read_word(client, BQ24735_MANUFACTURER_ID);
	385	if (ret < 0) {
	386	dev_err(&client->dev, "Failed to read manufacturer id : %d\n",
	387	ret);
71a5a508	388	return ret;
ce773992 DS	389	} else if (ret != 0x0040) {
	390	dev_err(&client->dev,
	391	"manufacturer id mismatch. 0x0040 != 0x%04x\n", ret);
71a5a508	392	return -ENODEV;
ce773992 DS	393	}
	394
	395	ret = bq24735_read_word(client, BQ24735_DEVICE_ID);
	396	if (ret < 0) {
	397	dev_err(&client->dev, "Failed to read device id : %d\n", ret);
71a5a508	398	return ret;
ce773992 DS	399	} else if (ret != 0x000B) {
	400	dev_err(&client->dev,
	401	"device id mismatch. 0x000b != 0x%04x\n", ret);
71a5a508	402	return -ENODEV;
ce773992 DS	403	}
	404
	405	if (gpio_is_valid(charger->pdata->status_gpio)) {
	406	ret = devm_gpio_request(&client->dev,
	407	charger->pdata->status_gpio,
	408	name);
	409	if (ret) {
	410	dev_err(&client->dev,
	411	"Failed GPIO request for GPIO %d: %d\n",
	412	charger->pdata->status_gpio, ret);
	413	}
	414
	415	charger->pdata->status_gpio_valid = !ret;
	416	}
	417
	418	ret = bq24735_config_charger(charger);
	419	if (ret < 0) {
	420	dev_err(&client->dev, "failed in configuring charger");
71a5a508	421	return ret;
ce773992 DS	422	}
	423
	424	/* check for AC adapter presence */
	425	if (bq24735_charger_is_present(charger)) {
	426	ret = bq24735_enable_charging(charger);
	427	if (ret < 0) {
	428	dev_err(&client->dev, "Failed to enable charging\n");
71a5a508	429	return ret;
ce773992 DS	430	}
	431	}
	432
71a5a508 VT	433	charger->charger = devm_power_supply_register(&client->dev, supply_desc,
71a5a508 VT	434	&psy_cfg);
297d716f KK	435	if (IS_ERR(charger->charger)) {
297d716f KK	436	ret = PTR_ERR(charger->charger);
ce773992 DS	437	dev_err(&client->dev, "Failed to register power supply: %d\n",
ce773992 DS	438	ret);
71a5a508	439	return ret;
ce773992 DS	440	}
	441
	442	if (client->irq) {
	443	ret = devm_request_threaded_irq(&client->dev, client->irq,
	444	NULL, bq24735_charger_isr,
	445	IRQF_TRIGGER_RISING \|
	446	IRQF_TRIGGER_FALLING \|
	447	IRQF_ONESHOT,
297d716f KK	448	supply_desc->name,
297d716f KK	449	charger->charger);
ce773992 DS	450	if (ret) {
	451	dev_err(&client->dev,
	452	"Unable to register IRQ %d err %d\n",
	453	client->irq, ret);
71a5a508	454	return ret;
ce773992 DS	455	}
	456	}
	457
ce773992 DS	458	return 0;
	459	}
	460
	461	static const struct i2c_device_id bq24735_charger_id[] = {
	462	{ "bq24735-charger", 0 },
	463	{}
	464	};
	465	MODULE_DEVICE_TABLE(i2c, bq24735_charger_id);
	466
	467	static const struct of_device_id bq24735_match_ids[] = {
	468	{ .compatible = "ti,bq24735", },
	469	{ /* end */ }
	470	};
	471	MODULE_DEVICE_TABLE(of, bq24735_match_ids);
	472
	473	static struct i2c_driver bq24735_charger_driver = {
	474	.driver = {
	475	.name = "bq24735-charger",
ce773992 DS	476	.of_match_table = bq24735_match_ids,
	477	},
	478	.probe = bq24735_charger_probe,
ce773992 DS	479	.id_table = bq24735_charger_id,
	480	};
	481
	482	module_i2c_driver(bq24735_charger_driver);
	483
	484	MODULE_DESCRIPTION("bq24735 battery charging driver");
	485	MODULE_AUTHOR("Darbha Sriharsha <dsriharsha@nvidia.com>");
	486	MODULE_LICENSE("GPL v2");