[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;
};

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->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;

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