[linux-2.6-block.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 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 const 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 const 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_dev *rdev;
	struct regulator_config config = { };
	struct regulator_init_data *init_data	= dev_get_platdata(&i2c->dev);
	struct isl_pmic *pmic;
	int 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 = NULL;
		config.driver_data = pmic;

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

	i2c_set_clientdata(i2c, pmic);

	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",
	},
	.probe = isl6271a_probe,
	.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;
51bd6943 MV	34	struct mutex mtx;
	35	};
	36
a9b2899b	37	static int isl6271a_get_voltage_sel(struct regulator_dev *dev)
51bd6943 MV	38	{
51bd6943 MV	39	struct isl_pmic *pmic = rdev_get_drvdata(dev);
a9b2899b	40	int idx;
51bd6943 MV	41
	42	mutex_lock(&pmic->mtx);
	43
	44	idx = i2c_smbus_read_byte(pmic->client);
a9b2899b	45	if (idx < 0)
51bd6943	46	dev_err(&pmic->client->dev, "Error getting voltage\n");
51bd6943	47
51bd6943	48	mutex_unlock(&pmic->mtx);
a9b2899b	49	return idx;
51bd6943 MV	50	}
51bd6943 MV	51
dde2b724 AL	52	static int isl6271a_set_voltage_sel(struct regulator_dev *dev,
dde2b724 AL	53	unsigned selector)
51bd6943 MV	54	{
51bd6943 MV	55	struct isl_pmic *pmic = rdev_get_drvdata(dev);
dde2b724	56	int err;
3a93f2a9	57
51bd6943 MV	58	mutex_lock(&pmic->mtx);
51bd6943 MV	59
dde2b724	60	err = i2c_smbus_write_byte(pmic->client, selector);
51bd6943 MV	61	if (err < 0)
	62	dev_err(&pmic->client->dev, "Error setting voltage\n");
	63
	64	mutex_unlock(&pmic->mtx);
	65	return err;
	66	}
	67
1dceee5e	68	static const struct regulator_ops isl_core_ops = {
a9b2899b	69	.get_voltage_sel = isl6271a_get_voltage_sel,
dde2b724	70	.set_voltage_sel = isl6271a_set_voltage_sel,
2b7a7a4e	71	.list_voltage = regulator_list_voltage_linear,
dde2b724	72	.map_voltage = regulator_map_voltage_linear,
51bd6943 MV	73	};
51bd6943 MV	74
1dceee5e	75	static const struct regulator_ops isl_fixed_ops = {
985f769c	76	.list_voltage = regulator_list_voltage_linear,
51bd6943 MV	77	};
51bd6943 MV	78
4b65e159	79	static const struct regulator_desc isl_rd[] = {
51bd6943 MV	80	{
	81	.name = "Core Buck",
	82	.id = 0,
	83	.n_voltages = 16,
	84	.ops = &isl_core_ops,
	85	.type = REGULATOR_VOLTAGE,
	86	.owner = THIS_MODULE,
2b7a7a4e AL	87	.min_uV = ISL6271A_VOLTAGE_MIN,
2b7a7a4e AL	88	.uV_step = ISL6271A_VOLTAGE_STEP,
51bd6943 MV	89	}, {
	90	.name = "LDO1",
	91	.id = 1,
	92	.n_voltages = 1,
	93	.ops = &isl_fixed_ops,
	94	.type = REGULATOR_VOLTAGE,
	95	.owner = THIS_MODULE,
985f769c	96	.min_uV = 1100000,
51bd6943 MV	97	}, {
	98	.name = "LDO2",
	99	.id = 2,
	100	.n_voltages = 1,
	101	.ops = &isl_fixed_ops,
	102	.type = REGULATOR_VOLTAGE,
	103	.owner = THIS_MODULE,
985f769c	104	.min_uV = 1300000,
51bd6943 MV	105	},
	106	};
	107
a5023574	108	static int isl6271a_probe(struct i2c_client *i2c,
51bd6943 MV	109	const struct i2c_device_id *id)
51bd6943 MV	110	{
a6e58299	111	struct regulator_dev *rdev;
c172708d	112	struct regulator_config config = { };
dff91d0b	113	struct regulator_init_data *init_data = dev_get_platdata(&i2c->dev);
51bd6943	114	struct isl_pmic *pmic;
0ab6e8ca	115	int i;
51bd6943 MV	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
85bea1bf	133	config.init_data = NULL;
c172708d MB	134	config.driver_data = pmic;
c172708d MB	135
a6e58299 AL	136	rdev = devm_regulator_register(&i2c->dev, &isl_rd[i], &config);
a6e58299 AL	137	if (IS_ERR(rdev)) {
51bd6943	138	dev_err(&i2c->dev, "failed to register %s\n", id->name);
a6e58299	139	return PTR_ERR(rdev);
51bd6943 MV	140	}
	141	}
	142
	143	i2c_set_clientdata(i2c, pmic);
	144
	145	return 0;
51bd6943 MV	146	}
	147
	148	static const struct i2c_device_id isl6271a_id[] = {
	149	{.name = "isl6271a", 0 },
	150	{ },
	151	};
	152
	153	MODULE_DEVICE_TABLE(i2c, isl6271a_id);
	154
	155	static struct i2c_driver isl6271a_i2c_driver = {
	156	.driver = {
	157	.name = "isl6271a",
51bd6943 MV	158	},
51bd6943 MV	159	.probe = isl6271a_probe,
51bd6943 MV	160	.id_table = isl6271a_id,
	161	};
	162
	163	static int __init isl6271a_init(void)
	164	{
	165	return i2c_add_driver(&isl6271a_i2c_driver);
	166	}
	167
	168	static void __exit isl6271a_cleanup(void)
	169	{
	170	i2c_del_driver(&isl6271a_i2c_driver);
	171	}
	172
	173	subsys_initcall(isl6271a_init);
	174	module_exit(isl6271a_cleanup);
	175
	176	MODULE_AUTHOR("Marek Vasut <marek.vasut@gmail.com>");
	177	MODULE_DESCRIPTION("Intersil ISL6271A voltage regulator driver");
	178	MODULE_LICENSE("GPL v2");