[net-next-2.6.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)
{
	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;

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