[GitHub/mt8127/android_kernel_alcatel_ttab.git] / drivers / regulator / max1586.c

/*
 * max1586.c  --  Voltage and current regulation for the Maxim 1586
 *
 * Copyright (C) 2008 Robert Jarzmik
 *
 * 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; either version 2 of the License, or
 * (at your option) any later version.
 *
 * This program is distributed in the hope that it will be useful,
 * but WITHOUT ANY WARRANTY; without even the implied warranty of
 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
 * GNU General Public License for more details.
 *
 * You should have received a copy of the GNU General Public License
 * along with this program; if not, write to the Free Software
 * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA  02111-1307  USA
 */
#include <linux/module.h>
#include <linux/err.h>
#include <linux/i2c.h>
#include <linux/platform_device.h>
#include <linux/regulator/driver.h>
#include <linux/slab.h>
#include <linux/regulator/max1586.h>

#define MAX1586_V3_MAX_VSEL 31
#define MAX1586_V6_MAX_VSEL 3

#define MAX1586_V3_MIN_UV   700000
#define MAX1586_V3_MAX_UV  1475000

#define MAX1586_V6_MIN_UV        0
#define MAX1586_V6_MAX_UV  3000000

#define I2C_V3_SELECT (0 << 5)
#define I2C_V6_SELECT (1 << 5)

struct max1586_data {
	struct i2c_client *client;

	/* min/max V3 voltage */
	unsigned int min_uV;
	unsigned int max_uV;

	struct regulator_dev *rdev[0];
};

/*
 * V3 voltage
 * On I2C bus, sending a "x" byte to the max1586 means :
 *   set V3 to 0.700V + (x & 0x1f) * 0.025V
 * This voltage can be increased by external resistors
 * R24 and R25=100kOhm as described in the data sheet.
 * The gain is approximately: 1 + R24/R25 + R24/185.5kOhm
 */
static int max1586_v3_calc_voltage(struct max1586_data *max1586,
	unsigned selector)
{
	unsigned range_uV = max1586->max_uV - max1586->min_uV;

	return max1586->min_uV + (selector * range_uV / MAX1586_V3_MAX_VSEL);
}

static int max1586_v3_set(struct regulator_dev *rdev, int min_uV, int max_uV)
{
	struct max1586_data *max1586 = rdev_get_drvdata(rdev);
	struct i2c_client *client = max1586->client;
	unsigned range_uV = max1586->max_uV - max1586->min_uV;
	unsigned selector;
	u8 v3_prog;

	if (min_uV > max1586->max_uV || max_uV < max1586->min_uV)
		return -EINVAL;
	if (min_uV < max1586->min_uV)
		min_uV = max1586->min_uV;

	selector = ((min_uV - max1586->min_uV) * MAX1586_V3_MAX_VSEL +
			range_uV - 1) / range_uV;
	if (max1586_v3_calc_voltage(max1586, selector) > max_uV)
		return -EINVAL;

	dev_dbg(&client->dev, "changing voltage v3 to %dmv\n",
		max1586_v3_calc_voltage(max1586, selector) / 1000);

	v3_prog = I2C_V3_SELECT | (u8) selector;
	return i2c_smbus_write_byte(client, v3_prog);
}

static int max1586_v3_list(struct regulator_dev *rdev, unsigned selector)
{
	struct max1586_data *max1586 = rdev_get_drvdata(rdev);

	if (selector > MAX1586_V3_MAX_VSEL)
		return -EINVAL;
	return max1586_v3_calc_voltage(max1586, selector);
}

/*
 * V6 voltage
 * On I2C bus, sending a "x" byte to the max1586 means :
 *   set V6 to either 0V, 1.8V, 2.5V, 3V depending on (x & 0x3)
 * As regulator framework doesn't accept voltages to be 0V, we use 1uV.
 */
static int max1586_v6_calc_voltage(unsigned selector)
{
	static int voltages_uv[] = { 1, 1800000, 2500000, 3000000 };

	return voltages_uv[selector];
}

static int max1586_v6_set(struct regulator_dev *rdev, int min_uV, int max_uV)
{
	struct i2c_client *client = rdev_get_drvdata(rdev);
	unsigned selector;
	u8 v6_prog;

	if (min_uV < MAX1586_V6_MIN_UV || min_uV > MAX1586_V6_MAX_UV)
		return -EINVAL;
	if (max_uV < MAX1586_V6_MIN_UV || max_uV > MAX1586_V6_MAX_UV)
		return -EINVAL;

	if (min_uV >= 3000000)
		selector = 3;
	if (min_uV < 3000000)
		selector = 2;
	if (min_uV < 2500000)
		selector = 1;
	if (min_uV < 1800000)
		selector = 0;

	if (max1586_v6_calc_voltage(selector) > max_uV)
		return -EINVAL;

	dev_dbg(&client->dev, "changing voltage v6 to %dmv\n",
		max1586_v6_calc_voltage(selector) / 1000);

	v6_prog = I2C_V6_SELECT | (u8) selector;
	return i2c_smbus_write_byte(client, v6_prog);
}

static int max1586_v6_list(struct regulator_dev *rdev, unsigned selector)
{
	if (selector > MAX1586_V6_MAX_VSEL)
		return -EINVAL;
	return max1586_v6_calc_voltage(selector);
}

/*
 * The Maxim 1586 controls V3 and V6 voltages, but offers no way of reading back
 * the set up value.
 */
static struct regulator_ops max1586_v3_ops = {
	.set_voltage = max1586_v3_set,
	.list_voltage = max1586_v3_list,
};

static struct regulator_ops max1586_v6_ops = {
	.set_voltage = max1586_v6_set,
	.list_voltage = max1586_v6_list,
};

static struct regulator_desc max1586_reg[] = {
	{
		.name = "Output_V3",
		.id = MAX1586_V3,
		.ops = &max1586_v3_ops,
		.type = REGULATOR_VOLTAGE,
		.n_voltages = MAX1586_V3_MAX_VSEL + 1,
		.owner = THIS_MODULE,
	},
	{
		.name = "Output_V6",
		.id = MAX1586_V6,
		.ops = &max1586_v6_ops,
		.type = REGULATOR_VOLTAGE,
		.n_voltages = MAX1586_V6_MAX_VSEL + 1,
		.owner = THIS_MODULE,
	},
};

static int __devinit max1586_pmic_probe(struct i2c_client *client,
					const struct i2c_device_id *i2c_id)
{
	struct regulator_dev **rdev;
	struct max1586_platform_data *pdata = client->dev.platform_data;
	struct max1586_data *max1586;
	int i, id, ret = -ENOMEM;

	max1586 = kzalloc(sizeof(struct max1586_data) +
			sizeof(struct regulator_dev *) * (MAX1586_V6 + 1),
			GFP_KERNEL);
	if (!max1586)
		goto out;

	max1586->client = client;

	if (!pdata->v3_gain) {
		ret = -EINVAL;
		goto out_unmap;
	}
	max1586->min_uV = MAX1586_V3_MIN_UV / 1000 * pdata->v3_gain / 1000;
	max1586->max_uV = MAX1586_V3_MAX_UV / 1000 * pdata->v3_gain / 1000;

	rdev = max1586->rdev;
	for (i = 0; i < pdata->num_subdevs && i <= MAX1586_V6; i++) {
		id = pdata->subdevs[i].id;
		if (!pdata->subdevs[i].platform_data)
			continue;
		if (id < MAX1586_V3 || id > MAX1586_V6) {
			dev_err(&client->dev, "invalid regulator id %d\n", id);
			goto err;
		}
		rdev[i] = regulator_register(&max1586_reg[id], &client->dev,
					     pdata->subdevs[i].platform_data,
					     max1586);
		if (IS_ERR(rdev[i])) {
			ret = PTR_ERR(rdev[i]);
			dev_err(&client->dev, "failed to register %s\n",
				max1586_reg[id].name);
			goto err;
		}
	}

	i2c_set_clientdata(client, rdev);
	dev_info(&client->dev, "Maxim 1586 regulator driver loaded\n");
	return 0;

err:
	while (--i >= 0)
		regulator_unregister(rdev[i]);
out_unmap:
	kfree(max1586);
out:
	return ret;
}

static int __devexit max1586_pmic_remove(struct i2c_client *client)
{
	struct regulator_dev **rdev = i2c_get_clientdata(client);
	int i;

	for (i = 0; i <= MAX1586_V6; i++)
		if (rdev[i])
			regulator_unregister(rdev[i]);
	i2c_set_clientdata(client, NULL);
	kfree(rdev);

	return 0;
}

static const struct i2c_device_id max1586_id[] = {
	{ "max1586", 0 },
	{ }
};
MODULE_DEVICE_TABLE(i2c, max1586_id);

static struct i2c_driver max1586_pmic_driver = {
	.probe = max1586_pmic_probe,
	.remove = __devexit_p(max1586_pmic_remove),
	.driver		= {
		.name	= "max1586",
		.owner	= THIS_MODULE,
	},
	.id_table	= max1586_id,
};

static int __init max1586_pmic_init(void)
{
	return i2c_add_driver(&max1586_pmic_driver);
}
subsys_initcall(max1586_pmic_init);

static void __exit max1586_pmic_exit(void)
{
	i2c_del_driver(&max1586_pmic_driver);
}
module_exit(max1586_pmic_exit);

/* Module information */
MODULE_DESCRIPTION("MAXIM 1586 voltage regulator driver");
MODULE_AUTHOR("Robert Jarzmik");
MODULE_LICENSE("GPL");
Commit	Line	Data
55f4fa4e RJ	1	/*
	2	* max1586.c -- Voltage and current regulation for the Maxim 1586
	3	*
	4	* Copyright (C) 2008 Robert Jarzmik
	5	*
	6	* This program is free software; you can redistribute it and/or modify
	7	* it under the terms of the GNU General Public License as published by
	8	* the Free Software Foundation; either version 2 of the License, or
	9	* (at your option) any later version.
	10	*
	11	* This program is distributed in the hope that it will be useful,
	12	* but WITHOUT ANY WARRANTY; without even the implied warranty of
	13	* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
	14	* GNU General Public License for more details.
	15	*
	16	* You should have received a copy of the GNU General Public License
	17	* along with this program; if not, write to the Free Software
	18	* Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
	19	*/
	20	#include <linux/module.h>
	21	#include <linux/err.h>
	22	#include <linux/i2c.h>
	23	#include <linux/platform_device.h>
	24	#include <linux/regulator/driver.h>
5a0e3ad6	25	#include <linux/slab.h>
55f4fa4e RJ	26	#include <linux/regulator/max1586.h>
	27
	28	#define MAX1586_V3_MAX_VSEL 31
	29	#define MAX1586_V6_MAX_VSEL 3
	30
	31	#define MAX1586_V3_MIN_UV 700000
	32	#define MAX1586_V3_MAX_UV 1475000
55f4fa4e RJ	33
	34	#define MAX1586_V6_MIN_UV 0
	35	#define MAX1586_V6_MAX_UV 3000000
	36
	37	#define I2C_V3_SELECT (0 << 5)
	38	#define I2C_V6_SELECT (1 << 5)
	39
b110a8fb PZ	40	struct max1586_data {
	41	struct i2c_client *client;
	42
	43	/* min/max V3 voltage */
c8f1e502 PZ	44	unsigned int min_uV;
c8f1e502 PZ	45	unsigned int max_uV;
b110a8fb PZ	46
	47	struct regulator_dev *rdev[0];
	48	};
	49
55f4fa4e RJ	50	/*
	51	* V3 voltage
	52	* On I2C bus, sending a "x" byte to the max1586 means :
	53	* set V3 to 0.700V + (x & 0x1f) * 0.025V
b110a8fb PZ	54	* This voltage can be increased by external resistors
	55	* R24 and R25=100kOhm as described in the data sheet.
	56	* The gain is approximately: 1 + R24/R25 + R24/185.5kOhm
55f4fa4e	57	*/
b110a8fb PZ	58	static int max1586_v3_calc_voltage(struct max1586_data *max1586,
b110a8fb PZ	59	unsigned selector)
55f4fa4e	60	{
b110a8fb PZ	61	unsigned range_uV = max1586->max_uV - max1586->min_uV;
	62
	63	return max1586->min_uV + (selector * range_uV / MAX1586_V3_MAX_VSEL);
55f4fa4e RJ	64	}
	65
	66	static int max1586_v3_set(struct regulator_dev *rdev, int min_uV, int max_uV)
	67	{
b110a8fb PZ	68	struct max1586_data *max1586 = rdev_get_drvdata(rdev);
	69	struct i2c_client *client = max1586->client;
	70	unsigned range_uV = max1586->max_uV - max1586->min_uV;
55f4fa4e RJ	71	unsigned selector;
	72	u8 v3_prog;
	73
b110a8fb	74	if (min_uV > max1586->max_uV \|\| max_uV < max1586->min_uV)
55f4fa4e	75	return -EINVAL;
b110a8fb PZ	76	if (min_uV < max1586->min_uV)
b110a8fb PZ	77	min_uV = max1586->min_uV;
55f4fa4e	78
b110a8fb PZ	79	selector = ((min_uV - max1586->min_uV) * MAX1586_V3_MAX_VSEL +
	80	range_uV - 1) / range_uV;
	81	if (max1586_v3_calc_voltage(max1586, selector) > max_uV)
55f4fa4e RJ	82	return -EINVAL;
	83
	84	dev_dbg(&client->dev, "changing voltage v3 to %dmv\n",
b110a8fb	85	max1586_v3_calc_voltage(max1586, selector) / 1000);
55f4fa4e RJ	86
	87	v3_prog = I2C_V3_SELECT \| (u8) selector;
	88	return i2c_smbus_write_byte(client, v3_prog);
	89	}
	90
	91	static int max1586_v3_list(struct regulator_dev *rdev, unsigned selector)
	92	{
b110a8fb PZ	93	struct max1586_data *max1586 = rdev_get_drvdata(rdev);
b110a8fb PZ	94
55f4fa4e RJ	95	if (selector > MAX1586_V3_MAX_VSEL)
55f4fa4e RJ	96	return -EINVAL;
b110a8fb	97	return max1586_v3_calc_voltage(max1586, selector);
55f4fa4e RJ	98	}
	99
	100	/*
	101	* V6 voltage
	102	* On I2C bus, sending a "x" byte to the max1586 means :
	103	* set V6 to either 0V, 1.8V, 2.5V, 3V depending on (x & 0x3)
	104	* As regulator framework doesn't accept voltages to be 0V, we use 1uV.
	105	*/
	106	static int max1586_v6_calc_voltage(unsigned selector)
	107	{
	108	static int voltages_uv[] = { 1, 1800000, 2500000, 3000000 };
	109
	110	return voltages_uv[selector];
	111	}
	112
	113	static int max1586_v6_set(struct regulator_dev *rdev, int min_uV, int max_uV)
	114	{
	115	struct i2c_client *client = rdev_get_drvdata(rdev);
	116	unsigned selector;
	117	u8 v6_prog;
	118
	119	if (min_uV < MAX1586_V6_MIN_UV \|\| min_uV > MAX1586_V6_MAX_UV)
	120	return -EINVAL;
	121	if (max_uV < MAX1586_V6_MIN_UV \|\| max_uV > MAX1586_V6_MAX_UV)
	122	return -EINVAL;
	123
	124	if (min_uV >= 3000000)
	125	selector = 3;
	126	if (min_uV < 3000000)
	127	selector = 2;
	128	if (min_uV < 2500000)
	129	selector = 1;
	130	if (min_uV < 1800000)
	131	selector = 0;
	132
	133	if (max1586_v6_calc_voltage(selector) > max_uV)
	134	return -EINVAL;
	135
	136	dev_dbg(&client->dev, "changing voltage v6 to %dmv\n",
	137	max1586_v6_calc_voltage(selector) / 1000);
	138
	139	v6_prog = I2C_V6_SELECT \| (u8) selector;
	140	return i2c_smbus_write_byte(client, v6_prog);
	141	}
	142
	143	static int max1586_v6_list(struct regulator_dev *rdev, unsigned selector)
	144	{
	145	if (selector > MAX1586_V6_MAX_VSEL)
	146	return -EINVAL;
	147	return max1586_v6_calc_voltage(selector);
	148	}
	149
	150	/*
	151	* The Maxim 1586 controls V3 and V6 voltages, but offers no way of reading back
	152	* the set up value.
	153	*/
	154	static struct regulator_ops max1586_v3_ops = {
	155	.set_voltage = max1586_v3_set,
	156	.list_voltage = max1586_v3_list,
	157	};
	158
	159	static struct regulator_ops max1586_v6_ops = {
	160	.set_voltage = max1586_v6_set,
	161	.list_voltage = max1586_v6_list,
162	};
163
164	static struct regulator_desc max1586_reg[] = {
165	{
166	.name = "Output_V3",
167	.id = MAX1586_V3,
168	.ops = &max1586_v3_ops,
169	.type = REGULATOR_VOLTAGE,
170	.n_voltages = MAX1586_V3_MAX_VSEL + 1,
171	.owner = THIS_MODULE,
172	},
173	{
174	.name = "Output_V6",
175	.id = MAX1586_V6,
176	.ops = &max1586_v6_ops,
177	.type = REGULATOR_VOLTAGE,
178	.n_voltages = MAX1586_V6_MAX_VSEL + 1,
179	.owner = THIS_MODULE,
180	},
181	};
182
bd88c9b2 DT	183	static int __devinit max1586_pmic_probe(struct i2c_client *client,
bd88c9b2 DT	184	const struct i2c_device_id *i2c_id)
55f4fa4e RJ	185	{
	186	struct regulator_dev **rdev;
	187	struct max1586_platform_data *pdata = client->dev.platform_data;
b110a8fb PZ	188	struct max1586_data *max1586;
	189	int i, id, ret = -ENOMEM;
	190
	191	max1586 = kzalloc(sizeof(struct max1586_data) +
	192	sizeof(struct regulator_dev ) (MAX1586_V6 + 1),
	193	GFP_KERNEL);
	194	if (!max1586)
	195	goto out;
55f4fa4e	196
b110a8fb	197	max1586->client = client;
55f4fa4e	198
b110a8fb PZ	199	if (!pdata->v3_gain) {
	200	ret = -EINVAL;
	201	goto out_unmap;
	202	}
c8f1e502 PZ	203	max1586->min_uV = MAX1586_V3_MIN_UV / 1000 * pdata->v3_gain / 1000;
c8f1e502 PZ	204	max1586->max_uV = MAX1586_V3_MAX_UV / 1000 * pdata->v3_gain / 1000;
b110a8fb PZ	205
b110a8fb PZ	206	rdev = max1586->rdev;
55f4fa4e RJ	207	for (i = 0; i < pdata->num_subdevs && i <= MAX1586_V6; i++) {
	208	id = pdata->subdevs[i].id;
	209	if (!pdata->subdevs[i].platform_data)
	210	continue;
	211	if (id < MAX1586_V3 \|\| id > MAX1586_V6) {
	212	dev_err(&client->dev, "invalid regulator id %d\n", id);
	213	goto err;
	214	}
	215	rdev[i] = regulator_register(&max1586_reg[id], &client->dev,
	216	pdata->subdevs[i].platform_data,
b110a8fb	217	max1586);
55f4fa4e RJ	218	if (IS_ERR(rdev[i])) {
	219	ret = PTR_ERR(rdev[i]);
	220	dev_err(&client->dev, "failed to register %s\n",
	221	max1586_reg[id].name);
	222	goto err;
	223	}
	224	}
	225
	226	i2c_set_clientdata(client, rdev);
	227	dev_info(&client->dev, "Maxim 1586 regulator driver loaded\n");
	228	return 0;
	229
	230	err:
	231	while (--i >= 0)
	232	regulator_unregister(rdev[i]);
b110a8fb PZ	233	out_unmap:
	234	kfree(max1586);
	235	out:
55f4fa4e RJ	236	return ret;
	237	}
	238
bd88c9b2	239	static int __devexit max1586_pmic_remove(struct i2c_client *client)
55f4fa4e RJ	240	{
	241	struct regulator_dev **rdev = i2c_get_clientdata(client);
	242	int i;
	243
	244	for (i = 0; i <= MAX1586_V6; i++)
	245	if (rdev[i])
	246	regulator_unregister(rdev[i]);
55f4fa4e	247	i2c_set_clientdata(client, NULL);
8b4709ec	248	kfree(rdev);
55f4fa4e RJ	249
	250	return 0;
	251	}
	252
	253	static const struct i2c_device_id max1586_id[] = {
	254	{ "max1586", 0 },
	255	{ }
	256	};
	257	MODULE_DEVICE_TABLE(i2c, max1586_id);
	258
	259	static struct i2c_driver max1586_pmic_driver = {
	260	.probe = max1586_pmic_probe,
bd88c9b2	261	.remove = __devexit_p(max1586_pmic_remove),
55f4fa4e RJ	262	.driver = {
55f4fa4e RJ	263	.name = "max1586",
bd88c9b2	264	.owner = THIS_MODULE,
55f4fa4e RJ	265	},
	266	.id_table = max1586_id,
	267	};
	268
	269	static int __init max1586_pmic_init(void)
	270	{
	271	return i2c_add_driver(&max1586_pmic_driver);
	272	}
	273	subsys_initcall(max1586_pmic_init);
	274
	275	static void __exit max1586_pmic_exit(void)
	276	{
	277	i2c_del_driver(&max1586_pmic_driver);
	278	}
	279	module_exit(max1586_pmic_exit);
	280
	281	/* Module information */
	282	MODULE_DESCRIPTION("MAXIM 1586 voltage regulator driver");
	283	MODULE_AUTHOR("Robert Jarzmik");
	284	MODULE_LICENSE("GPL");