[linux-2.6-block.git] / drivers / power / bq27xxx_battery_i2c.c

/*
 * SCI Reset driver for Keystone based devices
 *
 * Copyright (C) 2015 Texas Instruments Incorporated - http://www.ti.com/
 *	Andrew F. Davis <afd@ti.com>
 *
 * This program is free software; you can redistribute it and/or modify
 * it under the terms of the GNU General Public License version 2 as
 * published by the Free Software Foundation.
 *
 * This program is distributed "as is" WITHOUT ANY WARRANTY of any
 * kind, whether express or implied; without even the implied warranty
 * of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
 * GNU General Public License for more details.
 */

#include <linux/i2c.h>
#include <linux/interrupt.h>
#include <linux/module.h>
#include <asm/unaligned.h>

#include <linux/power/bq27xxx_battery.h>

static DEFINE_IDR(battery_id);
static DEFINE_MUTEX(battery_mutex);

static irqreturn_t bq27xxx_battery_irq_handler_thread(int irq, void *data)
{
	struct bq27xxx_device_info *di = data;

	bq27xxx_battery_update(di);

	return IRQ_HANDLED;
}

static int bq27xxx_battery_i2c_read(struct bq27xxx_device_info *di, u8 reg,
				    bool single)
{
	struct i2c_client *client = to_i2c_client(di->dev);
	struct i2c_msg msg[2];
	unsigned char data[2];
	int ret;

	if (!client->adapter)
		return -ENODEV;

	msg[0].addr = client->addr;
	msg[0].flags = 0;
	msg[0].buf = &reg;
	msg[0].len = sizeof(reg);
	msg[1].addr = client->addr;
	msg[1].flags = I2C_M_RD;
	msg[1].buf = data;
	if (single)
		msg[1].len = 1;
	else
		msg[1].len = 2;

	ret = i2c_transfer(client->adapter, msg, ARRAY_SIZE(msg));
	if (ret < 0)
		return ret;

	if (!single)
		ret = get_unaligned_le16(data);
	else
		ret = data[0];

	return ret;
}

static int bq27xxx_battery_i2c_probe(struct i2c_client *client,
				     const struct i2c_device_id *id)
{
	struct bq27xxx_device_info *di;
	int ret;
	char *name;
	int num;

	/* Get new ID for the new battery device */
	mutex_lock(&battery_mutex);
	num = idr_alloc(&battery_id, client, 0, 0, GFP_KERNEL);
	mutex_unlock(&battery_mutex);
	if (num < 0)
		return num;

	name = devm_kasprintf(&client->dev, GFP_KERNEL, "%s-%d", id->name, num);
	if (!name)
		goto err_mem;

	di = devm_kzalloc(&client->dev, sizeof(*di), GFP_KERNEL);
	if (!di)
		goto err_mem;

	di->id = num;
	di->dev = &client->dev;
	di->chip = id->driver_data;
	di->name = name;
	di->bus.read = bq27xxx_battery_i2c_read;

	ret = bq27xxx_battery_setup(di);
	if (ret)
		goto err_failed;

	/* Schedule a polling after about 1 min */
	schedule_delayed_work(&di->work, 60 * HZ);

	i2c_set_clientdata(client, di);

	if (client->irq) {
		ret = devm_request_threaded_irq(&client->dev, client->irq,
				NULL, bq27xxx_battery_irq_handler_thread,
				IRQF_ONESHOT,
				di->name, di);
		if (ret) {
			dev_err(&client->dev,
				"Unable to register IRQ %d error %d\n",
				client->irq, ret);
			return ret;
		}
	}

	return 0;

err_mem:
	ret = -ENOMEM;

err_failed:
	mutex_lock(&battery_mutex);
	idr_remove(&battery_id, num);
	mutex_unlock(&battery_mutex);

	return ret;
}

static int bq27xxx_battery_i2c_remove(struct i2c_client *client)
{
	struct bq27xxx_device_info *di = i2c_get_clientdata(client);

	bq27xxx_battery_teardown(di);

	mutex_lock(&battery_mutex);
	idr_remove(&battery_id, di->id);
	mutex_unlock(&battery_mutex);

	return 0;
}

static const struct i2c_device_id bq27xxx_i2c_id_table[] = {
	{ "bq27200", BQ27000 },
	{ "bq27210", BQ27010 },
	{ "bq27500", BQ27500 },
	{ "bq27510", BQ27500 },
	{ "bq27520", BQ27500 },
	{ "bq27530", BQ27530 },
	{ "bq27531", BQ27530 },
	{ "bq27541", BQ27541 },
	{ "bq27542", BQ27541 },
	{ "bq27546", BQ27541 },
	{ "bq27742", BQ27541 },
	{ "bq27545", BQ27545 },
	{ "bq27421", BQ27421 },
	{ "bq27425", BQ27421 },
	{ "bq27441", BQ27421 },
	{ "bq27621", BQ27421 },
	{},
};
MODULE_DEVICE_TABLE(i2c, bq27xxx_i2c_id_table);

#ifdef CONFIG_OF
static const struct of_device_id bq27xxx_battery_i2c_of_match_table[] = {
	{ .compatible = "ti,bq27200" },
	{ .compatible = "ti,bq27210" },
	{ .compatible = "ti,bq27500" },
	{ .compatible = "ti,bq27510" },
	{ .compatible = "ti,bq27520" },
	{ .compatible = "ti,bq27530" },
	{ .compatible = "ti,bq27531" },
	{ .compatible = "ti,bq27541" },
	{ .compatible = "ti,bq27542" },
	{ .compatible = "ti,bq27546" },
	{ .compatible = "ti,bq27742" },
	{ .compatible = "ti,bq27545" },
	{ .compatible = "ti,bq27421" },
	{ .compatible = "ti,bq27425" },
	{ .compatible = "ti,bq27441" },
	{ .compatible = "ti,bq27621" },
	{},
};
MODULE_DEVICE_TABLE(of, bq27xxx_battery_i2c_of_match_table);
#endif

static struct i2c_driver bq27xxx_battery_i2c_driver = {
	.driver = {
		.name = "bq27xxx-battery",
		.of_match_table = of_match_ptr(bq27xxx_battery_i2c_of_match_table),
	},
	.probe = bq27xxx_battery_i2c_probe,
	.remove = bq27xxx_battery_i2c_remove,
	.id_table = bq27xxx_i2c_id_table,
};
module_i2c_driver(bq27xxx_battery_i2c_driver);

MODULE_AUTHOR("Andrew F. Davis <afd@ti.com>");
MODULE_DESCRIPTION("BQ27xxx battery monitor i2c driver");
MODULE_LICENSE("GPL");
Commit	Line	Data
703df6c0 AD	1	/*
	2	* SCI Reset driver for Keystone based devices
	3	*
	4	* Copyright (C) 2015 Texas Instruments Incorporated - http://www.ti.com/
	5	* Andrew F. Davis <afd@ti.com>
	6	*
	7	* This program is free software; you can redistribute it and/or modify
	8	* it under the terms of the GNU General Public License version 2 as
	9	* published by the Free Software Foundation.
	10	*
	11	* This program is distributed "as is" WITHOUT ANY WARRANTY of any
	12	* kind, whether express or implied; without even the implied warranty
	13	* of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
	14	* GNU General Public License for more details.
	15	*/
	16
	17	#include <linux/i2c.h>
	18	#include <linux/interrupt.h>
	19	#include <linux/module.h>
	20	#include <asm/unaligned.h>
	21
	22	#include <linux/power/bq27xxx_battery.h>
	23
9aafabc7 ID	24	static DEFINE_IDR(battery_id);
	25	static DEFINE_MUTEX(battery_mutex);
	26
703df6c0 AD	27	static irqreturn_t bq27xxx_battery_irq_handler_thread(int irq, void *data)
	28	{
	29	struct bq27xxx_device_info *di = data;
	30
	31	bq27xxx_battery_update(di);
	32
	33	return IRQ_HANDLED;
	34	}
	35
	36	static int bq27xxx_battery_i2c_read(struct bq27xxx_device_info *di, u8 reg,
	37	bool single)
	38	{
	39	struct i2c_client *client = to_i2c_client(di->dev);
	40	struct i2c_msg msg[2];
	41	unsigned char data[2];
	42	int ret;
	43
	44	if (!client->adapter)
	45	return -ENODEV;
	46
	47	msg[0].addr = client->addr;
	48	msg[0].flags = 0;
	49	msg[0].buf = ®
	50	msg[0].len = sizeof(reg);
	51	msg[1].addr = client->addr;
	52	msg[1].flags = I2C_M_RD;
	53	msg[1].buf = data;
	54	if (single)
	55	msg[1].len = 1;
	56	else
	57	msg[1].len = 2;
	58
	59	ret = i2c_transfer(client->adapter, msg, ARRAY_SIZE(msg));
	60	if (ret < 0)
	61	return ret;
	62
	63	if (!single)
	64	ret = get_unaligned_le16(data);
	65	else
	66	ret = data[0];
	67
	68	return ret;
	69	}
	70
	71	static int bq27xxx_battery_i2c_probe(struct i2c_client *client,
	72	const struct i2c_device_id *id)
	73	{
	74	struct bq27xxx_device_info *di;
	75	int ret;
9aafabc7 ID	76	char *name;
	77	int num;
	78
	79	/* Get new ID for the new battery device */
	80	mutex_lock(&battery_mutex);
	81	num = idr_alloc(&battery_id, client, 0, 0, GFP_KERNEL);
	82	mutex_unlock(&battery_mutex);
	83	if (num < 0)
	84	return num;
	85
	86	name = devm_kasprintf(&client->dev, GFP_KERNEL, "%s-%d", id->name, num);
	87	if (!name)
	88	goto err_mem;
703df6c0 AD	89
	90	di = devm_kzalloc(&client->dev, sizeof(*di), GFP_KERNEL);
	91	if (!di)
9aafabc7	92	goto err_mem;
703df6c0	93
9aafabc7	94	di->id = num;
703df6c0 AD	95	di->dev = &client->dev;
703df6c0 AD	96	di->chip = id->driver_data;
9aafabc7	97	di->name = name;
703df6c0 AD	98	di->bus.read = bq27xxx_battery_i2c_read;
	99
	100	ret = bq27xxx_battery_setup(di);
	101	if (ret)
9aafabc7	102	goto err_failed;
703df6c0 AD	103
	104	/* Schedule a polling after about 1 min */
	105	schedule_delayed_work(&di->work, 60 * HZ);
	106
	107	i2c_set_clientdata(client, di);
	108
	109	if (client->irq) {
	110	ret = devm_request_threaded_irq(&client->dev, client->irq,
	111	NULL, bq27xxx_battery_irq_handler_thread,
	112	IRQF_ONESHOT,
	113	di->name, di);
	114	if (ret) {
	115	dev_err(&client->dev,
	116	"Unable to register IRQ %d error %d\n",
	117	client->irq, ret);
	118	return ret;
	119	}
	120	}
	121
	122	return 0;
9aafabc7 ID	123
	124	err_mem:
	125	ret = -ENOMEM;
	126
	127	err_failed:
	128	mutex_lock(&battery_mutex);
	129	idr_remove(&battery_id, num);
	130	mutex_unlock(&battery_mutex);
	131
	132	return ret;
703df6c0 AD	133	}
	134
	135	static int bq27xxx_battery_i2c_remove(struct i2c_client *client)
	136	{
	137	struct bq27xxx_device_info *di = i2c_get_clientdata(client);
	138
	139	bq27xxx_battery_teardown(di);
	140
9aafabc7 ID	141	mutex_lock(&battery_mutex);
	142	idr_remove(&battery_id, di->id);
	143	mutex_unlock(&battery_mutex);
	144
703df6c0 AD	145	return 0;
	146	}
	147
	148	static const struct i2c_device_id bq27xxx_i2c_id_table[] = {
	149	{ "bq27200", BQ27000 },
	150	{ "bq27210", BQ27010 },
	151	{ "bq27500", BQ27500 },
	152	{ "bq27510", BQ27500 },
	153	{ "bq27520", BQ27500 },
	154	{ "bq27530", BQ27530 },
	155	{ "bq27531", BQ27530 },
	156	{ "bq27541", BQ27541 },
	157	{ "bq27542", BQ27541 },
	158	{ "bq27546", BQ27541 },
	159	{ "bq27742", BQ27541 },
	160	{ "bq27545", BQ27545 },
	161	{ "bq27421", BQ27421 },
	162	{ "bq27425", BQ27421 },
	163	{ "bq27441", BQ27421 },
	164	{ "bq27621", BQ27421 },
	165	{},
	166	};
	167	MODULE_DEVICE_TABLE(i2c, bq27xxx_i2c_id_table);
	168
7df3a746 PR	169	#ifdef CONFIG_OF
	170	static const struct of_device_id bq27xxx_battery_i2c_of_match_table[] = {
	171	{ .compatible = "ti,bq27200" },
	172	{ .compatible = "ti,bq27210" },
	173	{ .compatible = "ti,bq27500" },
	174	{ .compatible = "ti,bq27510" },
	175	{ .compatible = "ti,bq27520" },
	176	{ .compatible = "ti,bq27530" },
	177	{ .compatible = "ti,bq27531" },
	178	{ .compatible = "ti,bq27541" },
	179	{ .compatible = "ti,bq27542" },
	180	{ .compatible = "ti,bq27546" },
	181	{ .compatible = "ti,bq27742" },
	182	{ .compatible = "ti,bq27545" },
	183	{ .compatible = "ti,bq27421" },
	184	{ .compatible = "ti,bq27425" },
	185	{ .compatible = "ti,bq27441" },
	186	{ .compatible = "ti,bq27621" },
	187	{},
	188	};
	189	MODULE_DEVICE_TABLE(of, bq27xxx_battery_i2c_of_match_table);
	190	#endif
	191
703df6c0 AD	192	static struct i2c_driver bq27xxx_battery_i2c_driver = {
	193	.driver = {
	194	.name = "bq27xxx-battery",
7df3a746	195	.of_match_table = of_match_ptr(bq27xxx_battery_i2c_of_match_table),
703df6c0 AD	196	},
	197	.probe = bq27xxx_battery_i2c_probe,
	198	.remove = bq27xxx_battery_i2c_remove,
	199	.id_table = bq27xxx_i2c_id_table,
	200	};
	201	module_i2c_driver(bq27xxx_battery_i2c_driver);
	202
	203	MODULE_AUTHOR("Andrew F. Davis <afd@ti.com>");
	204	MODULE_DESCRIPTION("BQ27xxx battery monitor i2c driver");
	205	MODULE_LICENSE("GPL");