[GitHub/mt8127/android_kernel_alcatel_ttab.git] / drivers / regulator / isl6271a-regulator.c

/*
 * isl6271a-regulator.c
 *
 * Support for Intersil ISL6271A voltage regulator
 *
 * Copyright (C) 2010 Marek Vasut <marek.vasut@gmail.com>
 *
 * 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 version 2.
 *
 * 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/kernel.h>
#include <linux/module.h>
#include <linux/init.h>
#include <linux/err.h>
#include <linux/platform_device.h>
#include <linux/regulator/driver.h>
#include <linux/i2c.h>
#include <linux/slab.h>

#define	ISL6271A_VOLTAGE_MIN	850000
#define	ISL6271A_VOLTAGE_MAX	1600000
#define	ISL6271A_VOLTAGE_STEP	50000

/* PMIC details */
struct isl_pmic {
	struct i2c_client	*client;
	struct regulator_dev	*rdev[3];
	struct mutex		mtx;
};

static int isl6271a_get_voltage_sel(struct regulator_dev *dev)
{
	struct isl_pmic *pmic = rdev_get_drvdata(dev);
	int idx;

	mutex_lock(&pmic->mtx);

	idx = i2c_smbus_read_byte(pmic->client);
	if (idx < 0)
		dev_err(&pmic->client->dev, "Error getting voltage\n");

	mutex_unlock(&pmic->mtx);
	return idx;
}

static int isl6271a_set_voltage_sel(struct regulator_dev *dev,
				    unsigned selector)
{
	struct isl_pmic *pmic = rdev_get_drvdata(dev);
	int err;

	mutex_lock(&pmic->mtx);

	err = i2c_smbus_write_byte(pmic->client, selector);
	if (err < 0)
		dev_err(&pmic->client->dev, "Error setting voltage\n");

	mutex_unlock(&pmic->mtx);
	return err;
}

static struct regulator_ops isl_core_ops = {
	.get_voltage_sel = isl6271a_get_voltage_sel,
	.set_voltage_sel = isl6271a_set_voltage_sel,
	.list_voltage	= regulator_list_voltage_linear,
	.map_voltage	= regulator_map_voltage_linear,
};

static struct regulator_ops isl_fixed_ops = {
	.list_voltage	= regulator_list_voltage_linear,
};

static const struct regulator_desc isl_rd[] = {
	{
		.name		= "Core Buck",
		.id		= 0,
		.n_voltages	= 16,
		.ops		= &isl_core_ops,
		.type		= REGULATOR_VOLTAGE,
		.owner		= THIS_MODULE,
		.min_uV		= ISL6271A_VOLTAGE_MIN,
		.uV_step	= ISL6271A_VOLTAGE_STEP,
	}, {
		.name		= "LDO1",
		.id		= 1,
		.n_voltages	= 1,
		.ops		= &isl_fixed_ops,
		.type		= REGULATOR_VOLTAGE,
		.owner		= THIS_MODULE,
		.min_uV		= 1100000,
	}, {
		.name		= "LDO2",
		.id		= 2,
		.n_voltages	= 1,
		.ops		= &isl_fixed_ops,
		.type		= REGULATOR_VOLTAGE,
		.owner		= THIS_MODULE,
		.min_uV		= 1300000,
	},
};

static int isl6271a_probe(struct i2c_client *i2c,
				     const struct i2c_device_id *id)
{
	struct regulator_config config = { };
	struct regulator_init_data *init_data	= i2c->dev.platform_data;
	struct isl_pmic *pmic;
	int err, i;

	if (!i2c_check_functionality(i2c->adapter, I2C_FUNC_SMBUS_BYTE_DATA))
		return -EIO;

	pmic = devm_kzalloc(&i2c->dev, sizeof(struct isl_pmic), GFP_KERNEL);
	if (!pmic)
		return -ENOMEM;

	pmic->client = i2c;

	mutex_init(&pmic->mtx);

	for (i = 0; i < 3; i++) {
		config.dev = &i2c->dev;
		if (i == 0)
			config.init_data = init_data;
		else
			config.init_data = 0;
		config.driver_data = pmic;

		pmic->rdev[i] = regulator_register(&isl_rd[i], &config);
		if (IS_ERR(pmic->rdev[i])) {
			dev_err(&i2c->dev, "failed to register %s\n", id->name);
			err = PTR_ERR(pmic->rdev[i]);
			goto error;
		}
	}

	i2c_set_clientdata(i2c, pmic);

	return 0;

error:
	while (--i >= 0)
		regulator_unregister(pmic->rdev[i]);
	return err;
}

static int isl6271a_remove(struct i2c_client *i2c)
{
	struct isl_pmic *pmic = i2c_get_clientdata(i2c);
	int i;

	for (i = 0; i < 3; i++)
		regulator_unregister(pmic->rdev[i]);
	return 0;
}

static const struct i2c_device_id isl6271a_id[] = {
	{.name = "isl6271a", 0 },
	{ },
};

MODULE_DEVICE_TABLE(i2c, isl6271a_id);

static struct i2c_driver isl6271a_i2c_driver = {
	.driver = {
		.name = "isl6271a",
		.owner = THIS_MODULE,
	},
	.probe = isl6271a_probe,
	.remove = isl6271a_remove,
	.id_table = isl6271a_id,
};

static int __init isl6271a_init(void)
{
	return i2c_add_driver(&isl6271a_i2c_driver);
}

static void __exit isl6271a_cleanup(void)
{
	i2c_del_driver(&isl6271a_i2c_driver);
}

subsys_initcall(isl6271a_init);
module_exit(isl6271a_cleanup);

MODULE_AUTHOR("Marek Vasut <marek.vasut@gmail.com>");
MODULE_DESCRIPTION("Intersil ISL6271A voltage regulator driver");
MODULE_LICENSE("GPL v2");
Commit	Line	Data
51bd6943 MV	1	/*
	2	* isl6271a-regulator.c
	3	*
	4	* Support for Intersil ISL6271A voltage regulator
	5	*
	6	* Copyright (C) 2010 Marek Vasut <marek.vasut@gmail.com>
	7	*
	8	* This program is free software; you can redistribute it and/or
	9	* modify it under the terms of the GNU General Public License as
	10	* published by the Free Software Foundation version 2.
	11	*
	12	* This program is distributed "as is" WITHOUT ANY WARRANTY of any kind,
	13	* whether express or implied; without even the implied warranty of
	14	* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
	15	* General Public License for more details.
	16	*/
	17
	18	#include <linux/kernel.h>
	19	#include <linux/module.h>
	20	#include <linux/init.h>
	21	#include <linux/err.h>
	22	#include <linux/platform_device.h>
	23	#include <linux/regulator/driver.h>
	24	#include <linux/i2c.h>
51bd6943 MV	25	#include <linux/slab.h>
	26
	27	#define ISL6271A_VOLTAGE_MIN 850000
	28	#define ISL6271A_VOLTAGE_MAX 1600000
	29	#define ISL6271A_VOLTAGE_STEP 50000
	30
	31	/* PMIC details */
	32	struct isl_pmic {
	33	struct i2c_client *client;
	34	struct regulator_dev *rdev[3];
	35	struct mutex mtx;
	36	};
	37
a9b2899b	38	static int isl6271a_get_voltage_sel(struct regulator_dev *dev)
51bd6943 MV	39	{
51bd6943 MV	40	struct isl_pmic *pmic = rdev_get_drvdata(dev);
a9b2899b	41	int idx;
51bd6943 MV	42
	43	mutex_lock(&pmic->mtx);
	44
	45	idx = i2c_smbus_read_byte(pmic->client);
a9b2899b	46	if (idx < 0)
51bd6943	47	dev_err(&pmic->client->dev, "Error getting voltage\n");
51bd6943	48
51bd6943	49	mutex_unlock(&pmic->mtx);
a9b2899b	50	return idx;
51bd6943 MV	51	}
51bd6943 MV	52
dde2b724 AL	53	static int isl6271a_set_voltage_sel(struct regulator_dev *dev,
dde2b724 AL	54	unsigned selector)
51bd6943 MV	55	{
51bd6943 MV	56	struct isl_pmic *pmic = rdev_get_drvdata(dev);
dde2b724	57	int err;
3a93f2a9	58
51bd6943 MV	59	mutex_lock(&pmic->mtx);
51bd6943 MV	60
dde2b724	61	err = i2c_smbus_write_byte(pmic->client, selector);
51bd6943 MV	62	if (err < 0)
	63	dev_err(&pmic->client->dev, "Error setting voltage\n");
	64
	65	mutex_unlock(&pmic->mtx);
	66	return err;
	67	}
	68
51bd6943	69	static struct regulator_ops isl_core_ops = {
a9b2899b	70	.get_voltage_sel = isl6271a_get_voltage_sel,
dde2b724	71	.set_voltage_sel = isl6271a_set_voltage_sel,
2b7a7a4e	72	.list_voltage = regulator_list_voltage_linear,
dde2b724	73	.map_voltage = regulator_map_voltage_linear,
51bd6943 MV	74	};
51bd6943 MV	75
51bd6943	76	static struct regulator_ops isl_fixed_ops = {
985f769c	77	.list_voltage = regulator_list_voltage_linear,
51bd6943 MV	78	};
51bd6943 MV	79
4b65e159	80	static const struct regulator_desc isl_rd[] = {
51bd6943 MV	81	{
	82	.name = "Core Buck",
	83	.id = 0,
	84	.n_voltages = 16,
	85	.ops = &isl_core_ops,
	86	.type = REGULATOR_VOLTAGE,
	87	.owner = THIS_MODULE,
2b7a7a4e AL	88	.min_uV = ISL6271A_VOLTAGE_MIN,
2b7a7a4e AL	89	.uV_step = ISL6271A_VOLTAGE_STEP,
51bd6943 MV	90	}, {
	91	.name = "LDO1",
	92	.id = 1,
	93	.n_voltages = 1,
	94	.ops = &isl_fixed_ops,
	95	.type = REGULATOR_VOLTAGE,
	96	.owner = THIS_MODULE,
985f769c	97	.min_uV = 1100000,
51bd6943 MV	98	}, {
	99	.name = "LDO2",
	100	.id = 2,
	101	.n_voltages = 1,
	102	.ops = &isl_fixed_ops,
	103	.type = REGULATOR_VOLTAGE,
	104	.owner = THIS_MODULE,
985f769c	105	.min_uV = 1300000,
51bd6943 MV	106	},
	107	};
	108
a5023574	109	static int isl6271a_probe(struct i2c_client *i2c,
51bd6943 MV	110	const struct i2c_device_id *id)
51bd6943 MV	111	{
c172708d	112	struct regulator_config config = { };
51bd6943 MV	113	struct regulator_init_data *init_data = i2c->dev.platform_data;
	114	struct isl_pmic *pmic;
	115	int err, i;
	116
	117	if (!i2c_check_functionality(i2c->adapter, I2C_FUNC_SMBUS_BYTE_DATA))
	118	return -EIO;
	119
ef6bd5a3	120	pmic = devm_kzalloc(&i2c->dev, sizeof(struct isl_pmic), GFP_KERNEL);
51bd6943 MV	121	if (!pmic)
	122	return -ENOMEM;
	123
	124	pmic->client = i2c;
	125
	126	mutex_init(&pmic->mtx);
	127
	128	for (i = 0; i < 3; i++) {
c172708d MB	129	config.dev = &i2c->dev;
	130	if (i == 0)
	131	config.init_data = init_data;
	132	else
	133	config.init_data = 0;
	134	config.driver_data = pmic;
	135
	136	pmic->rdev[i] = regulator_register(&isl_rd[i], &config);
51bd6943 MV	137	if (IS_ERR(pmic->rdev[i])) {
51bd6943 MV	138	dev_err(&i2c->dev, "failed to register %s\n", id->name);
fa63bd4a	139	err = PTR_ERR(pmic->rdev[i]);
51bd6943 MV	140	goto error;
	141	}
	142	}
	143
	144	i2c_set_clientdata(i2c, pmic);
	145
	146	return 0;
	147
	148	error:
	149	while (--i >= 0)
	150	regulator_unregister(pmic->rdev[i]);
51bd6943 MV	151	return err;
	152	}
	153
8dc995f5	154	static int isl6271a_remove(struct i2c_client *i2c)
51bd6943 MV	155	{
	156	struct isl_pmic *pmic = i2c_get_clientdata(i2c);
	157	int i;
	158
51bd6943 MV	159	for (i = 0; i < 3; i++)
51bd6943 MV	160	regulator_unregister(pmic->rdev[i]);
51bd6943 MV	161	return 0;
	162	}
	163
	164	static const struct i2c_device_id isl6271a_id[] = {
	165	{.name = "isl6271a", 0 },
	166	{ },
	167	};
	168
	169	MODULE_DEVICE_TABLE(i2c, isl6271a_id);
	170
	171	static struct i2c_driver isl6271a_i2c_driver = {
	172	.driver = {
	173	.name = "isl6271a",
	174	.owner = THIS_MODULE,
	175	},
	176	.probe = isl6271a_probe,
5eb9f2b9	177	.remove = isl6271a_remove,
51bd6943 MV	178	.id_table = isl6271a_id,
	179	};
	180
	181	static int __init isl6271a_init(void)
	182	{
	183	return i2c_add_driver(&isl6271a_i2c_driver);
	184	}
	185
	186	static void __exit isl6271a_cleanup(void)
	187	{
	188	i2c_del_driver(&isl6271a_i2c_driver);
	189	}
	190
	191	subsys_initcall(isl6271a_init);
	192	module_exit(isl6271a_cleanup);
	193
	194	MODULE_AUTHOR("Marek Vasut <marek.vasut@gmail.com>");
	195	MODULE_DESCRIPTION("Intersil ISL6271A voltage regulator driver");
	196	MODULE_LICENSE("GPL v2");