[deliverable/linux.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/delay.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(struct regulator_dev *dev)
{
	struct isl_pmic *pmic = rdev_get_drvdata(dev);
	int idx, data;

	mutex_lock(&pmic->mtx);

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

	/* Convert the data from chip to microvolts */
	data = ISL6271A_VOLTAGE_MIN + (ISL6271A_VOLTAGE_STEP * (idx & 0xf));

out:
	mutex_unlock(&pmic->mtx);
	return data;
}

static int isl6271a_set_voltage(struct regulator_dev *dev,
				int minuV, int maxuV,
				unsigned *selector)
{
	struct isl_pmic *pmic = rdev_get_drvdata(dev);
	int vsel, err, data;

	if (minuV < ISL6271A_VOLTAGE_MIN || minuV > ISL6271A_VOLTAGE_MAX)
		return -EINVAL;
	if (maxuV < ISL6271A_VOLTAGE_MIN || maxuV > ISL6271A_VOLTAGE_MAX)
		return -EINVAL;

	/* Align to 50000 mV */
	vsel = minuV - (minuV % ISL6271A_VOLTAGE_STEP);

	/* If the result fell out of [minuV,maxuV] range, put it back */
	if (vsel < minuV)
		vsel += ISL6271A_VOLTAGE_STEP;

	/* Convert the microvolts to data for the chip */
	data = (vsel - ISL6271A_VOLTAGE_MIN) / ISL6271A_VOLTAGE_STEP;

	*selector = data;

	mutex_lock(&pmic->mtx);

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

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

static int isl6271a_list_voltage(struct regulator_dev *dev, unsigned selector)
{
	return ISL6271A_VOLTAGE_MIN + (ISL6271A_VOLTAGE_STEP * selector);
}

static struct regulator_ops isl_core_ops = {
	.get_voltage	= isl6271a_get_voltage,
	.set_voltage	= isl6271a_set_voltage,
	.list_voltage	= isl6271a_list_voltage,
};

static int isl6271a_get_fixed_voltage(struct regulator_dev *dev)
{
	int id = rdev_get_id(dev);
	return (id == 1) ? 1100000 : 1300000;
}

static int isl6271a_list_fixed_voltage(struct regulator_dev *dev, unsigned selector)
{
	int id = rdev_get_id(dev);
	return (id == 1) ? 1100000 : 1300000;
}

static struct regulator_ops isl_fixed_ops = {
	.get_voltage	= isl6271a_get_fixed_voltage,
	.list_voltage	= isl6271a_list_fixed_voltage,
};

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

static int __devinit isl6271a_probe(struct i2c_client *i2c,
				     const struct i2c_device_id *id)
{
	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;

	if (!init_data) {
		dev_err(&i2c->dev, "no platform data supplied\n");
		return -EIO;
	}

	pmic = kzalloc(sizeof(struct isl_pmic), GFP_KERNEL);
	if (!pmic)
		return -ENOMEM;

	pmic->client = i2c;

	mutex_init(&pmic->mtx);

	for (i = 0; i < 3; i++) {
		pmic->rdev[i] = regulator_register(&isl_rd[i], &i2c->dev,
						init_data, pmic);
		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]);

	kfree(pmic);
	return err;
}

static int __devexit 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]);

	kfree(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",
		.owner = THIS_MODULE,
	},
	.probe = isl6271a_probe,
	.remove = __devexit_p(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>
	25	#include <linux/delay.h>
	26	#include <linux/slab.h>
	27
	28	#define ISL6271A_VOLTAGE_MIN 850000
	29	#define ISL6271A_VOLTAGE_MAX 1600000
	30	#define ISL6271A_VOLTAGE_STEP 50000
	31
	32	/* PMIC details */
	33	struct isl_pmic {
	34	struct i2c_client *client;
	35	struct regulator_dev *rdev[3];
	36	struct mutex mtx;
	37	};
	38
	39	static int isl6271a_get_voltage(struct regulator_dev *dev)
	40	{
	41	struct isl_pmic *pmic = rdev_get_drvdata(dev);
	42	int idx, data;
	43
	44	mutex_lock(&pmic->mtx);
	45
	46	idx = i2c_smbus_read_byte(pmic->client);
	47	if (idx < 0) {
	48	dev_err(&pmic->client->dev, "Error getting voltage\n");
	49	data = idx;
	50	goto out;
	51	}
	52
	53	/* Convert the data from chip to microvolts */
	54	data = ISL6271A_VOLTAGE_MIN + (ISL6271A_VOLTAGE_STEP * (idx & 0xf));
	55
	56	out:
	57	mutex_unlock(&pmic->mtx);
	58	return data;
	59	}
	60
3a93f2a9 MB	61	static int isl6271a_set_voltage(struct regulator_dev *dev,
	62	int minuV, int maxuV,
	63	unsigned *selector)
51bd6943 MV	64	{
	65	struct isl_pmic *pmic = rdev_get_drvdata(dev);
	66	int vsel, err, data;
	67
	68	if (minuV < ISL6271A_VOLTAGE_MIN \|\| minuV > ISL6271A_VOLTAGE_MAX)
	69	return -EINVAL;
	70	if (maxuV < ISL6271A_VOLTAGE_MIN \|\| maxuV > ISL6271A_VOLTAGE_MAX)
	71	return -EINVAL;
	72
	73	/* Align to 50000 mV */
	74	vsel = minuV - (minuV % ISL6271A_VOLTAGE_STEP);
	75
	76	/* If the result fell out of [minuV,maxuV] range, put it back */
	77	if (vsel < minuV)
	78	vsel += ISL6271A_VOLTAGE_STEP;
	79
	80	/* Convert the microvolts to data for the chip */
	81	data = (vsel - ISL6271A_VOLTAGE_MIN) / ISL6271A_VOLTAGE_STEP;
	82
3a93f2a9 MB	83	*selector = data;
3a93f2a9 MB	84
51bd6943 MV	85	mutex_lock(&pmic->mtx);
	86
	87	err = i2c_smbus_write_byte(pmic->client, data);
	88	if (err < 0)
	89	dev_err(&pmic->client->dev, "Error setting voltage\n");
	90
	91	mutex_unlock(&pmic->mtx);
	92	return err;
	93	}
	94
	95	static int isl6271a_list_voltage(struct regulator_dev *dev, unsigned selector)
	96	{
	97	return ISL6271A_VOLTAGE_MIN + (ISL6271A_VOLTAGE_STEP * selector);
	98	}
	99
	100	static struct regulator_ops isl_core_ops = {
	101	.get_voltage = isl6271a_get_voltage,
	102	.set_voltage = isl6271a_set_voltage,
	103	.list_voltage = isl6271a_list_voltage,
	104	};
	105
	106	static int isl6271a_get_fixed_voltage(struct regulator_dev *dev)
	107	{
	108	int id = rdev_get_id(dev);
	109	return (id == 1) ? 1100000 : 1300000;
	110	}
	111
	112	static int isl6271a_list_fixed_voltage(struct regulator_dev *dev, unsigned selector)
	113	{
	114	int id = rdev_get_id(dev);
	115	return (id == 1) ? 1100000 : 1300000;
	116	}
	117
	118	static struct regulator_ops isl_fixed_ops = {
	119	.get_voltage = isl6271a_get_fixed_voltage,
	120	.list_voltage = isl6271a_list_fixed_voltage,
	121	};
	122
	123	static struct regulator_desc isl_rd[] = {
	124	{
	125	.name = "Core Buck",
	126	.id = 0,
	127	.n_voltages = 16,
	128	.ops = &isl_core_ops,
	129	.type = REGULATOR_VOLTAGE,
	130	.owner = THIS_MODULE,
	131	}, {
	132	.name = "LDO1",
	133	.id = 1,
	134	.n_voltages = 1,
	135	.ops = &isl_fixed_ops,
	136	.type = REGULATOR_VOLTAGE,
	137	.owner = THIS_MODULE,
	138	}, {
	139	.name = "LDO2",
	140	.id = 2,
	141	.n_voltages = 1,
	142	.ops = &isl_fixed_ops,
	143	.type = REGULATOR_VOLTAGE,
	144	.owner = THIS_MODULE,
	145	},
	146	};
	147
	148	static int __devinit isl6271a_probe(struct i2c_client *i2c,
149	const struct i2c_device_id *id)
150	{
151	struct regulator_init_data *init_data = i2c->dev.platform_data;
152	struct isl_pmic *pmic;
153	int err, i;
154
155	if (!i2c_check_functionality(i2c->adapter, I2C_FUNC_SMBUS_BYTE_DATA))
156	return -EIO;
157
158	if (!init_data) {
159	dev_err(&i2c->dev, "no platform data supplied\n");
160	return -EIO;
161	}
162
163	pmic = kzalloc(sizeof(struct isl_pmic), GFP_KERNEL);
164	if (!pmic)
165	return -ENOMEM;
166
167	pmic->client = i2c;
168
169	mutex_init(&pmic->mtx);
170
171	for (i = 0; i < 3; i++) {
b9e5d11a	172	pmic->rdev[i] = regulator_register(&isl_rd[i], &i2c->dev,
51bd6943 MV	173	init_data, pmic);
	174	if (IS_ERR(pmic->rdev[i])) {
	175	dev_err(&i2c->dev, "failed to register %s\n", id->name);
fa63bd4a	176	err = PTR_ERR(pmic->rdev[i]);
51bd6943 MV	177	goto error;
	178	}
	179	}
	180
	181	i2c_set_clientdata(i2c, pmic);
	182
	183	return 0;
	184
	185	error:
	186	while (--i >= 0)
	187	regulator_unregister(pmic->rdev[i]);
	188
	189	kfree(pmic);
	190	return err;
	191	}
	192
	193	static int __devexit isl6271a_remove(struct i2c_client *i2c)
	194	{
	195	struct isl_pmic *pmic = i2c_get_clientdata(i2c);
	196	int i;
	197
51bd6943 MV	198	for (i = 0; i < 3; i++)
	199	regulator_unregister(pmic->rdev[i]);
	200
	201	kfree(pmic);
	202
	203	return 0;
	204	}
	205
	206	static const struct i2c_device_id isl6271a_id[] = {
	207	{.name = "isl6271a", 0 },
	208	{ },
	209	};
	210
	211	MODULE_DEVICE_TABLE(i2c, isl6271a_id);
	212
	213	static struct i2c_driver isl6271a_i2c_driver = {
	214	.driver = {
	215	.name = "isl6271a",
	216	.owner = THIS_MODULE,
	217	},
	218	.probe = isl6271a_probe,
	219	.remove = __devexit_p(isl6271a_remove),
	220	.id_table = isl6271a_id,
	221	};
	222
	223	static int __init isl6271a_init(void)
	224	{
	225	return i2c_add_driver(&isl6271a_i2c_driver);
	226	}
	227
	228	static void __exit isl6271a_cleanup(void)
	229	{
	230	i2c_del_driver(&isl6271a_i2c_driver);
	231	}
	232
	233	subsys_initcall(isl6271a_init);
	234	module_exit(isl6271a_cleanup);
	235
	236	MODULE_AUTHOR("Marek Vasut <marek.vasut@gmail.com>");
	237	MODULE_DESCRIPTION("Intersil ISL6271A voltage regulator driver");
	238	MODULE_LICENSE("GPL v2");