[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];
};

/*
 * 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 v6_voltages_uv[] = { 1, 1800000, 2500000, 3000000 };

/*
 * 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_set_voltage_sel(struct regulator_dev *rdev,
				      unsigned selector)
{
	struct max1586_data *max1586 = rdev_get_drvdata(rdev);
	struct i2c_client *client = max1586->client;
	u8 v3_prog;

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

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

static int max1586_v6_set_voltage_sel(struct regulator_dev *rdev,
				      unsigned int selector)
{
	struct i2c_client *client = rdev_get_drvdata(rdev);
	u8 v6_prog;

	dev_dbg(&client->dev, "changing voltage v6 to %dmv\n",
		rdev->desc->volt_table[selector] / 1000);

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

/*
 * 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_sel = max1586_v3_set_voltage_sel,
	.list_voltage = regulator_list_voltage_linear,
	.map_voltage = regulator_map_voltage_linear,
};

static struct regulator_ops max1586_v6_ops = {
	.set_voltage_sel = max1586_v6_set_voltage_sel,
	.list_voltage = regulator_list_voltage_table,
};

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,
		.volt_table = v6_voltages_uv,
		.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 regulator_config config = { };
	struct max1586_data *max1586;
	int i, id, ret = -ENOMEM;

	max1586 = devm_kzalloc(&client->dev, sizeof(struct max1586_data) +
			sizeof(struct regulator_dev *) * (MAX1586_V6 + 1),
			GFP_KERNEL);
	if (!max1586)
		return -ENOMEM;

	max1586->client = client;

	if (!pdata->v3_gain)
		return -EINVAL;

	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;
		}

		if (id == MAX1586_V3) {
			max1586_reg[id].min_uV = max1586->min_uV;
			max1586_reg[id].uV_step =
					(max1586->max_uV - max1586->min_uV) /
					MAX1586_V3_MAX_VSEL;
		}

		config.dev = &client->dev;
		config.init_data = pdata->subdevs[i].platform_data;
		config.driver_data = max1586;

		rdev[i] = regulator_register(&max1586_reg[id], &config);
		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, max1586);
	dev_info(&client->dev, "Maxim 1586 regulator driver loaded\n");
	return 0;

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

static int __devexit max1586_pmic_remove(struct i2c_client *client)
{
	struct max1586_data *max1586 = i2c_get_clientdata(client);
	int i;

	for (i = 0; i <= MAX1586_V6; i++)
		if (max1586->rdev[i])
			regulator_unregister(max1586->rdev[i]);
	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 = 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
96d25221 AL	50	/*
	51	* V6 voltage
	52	* On I2C bus, sending a "x" byte to the max1586 means :
	53	* set V6 to either 0V, 1.8V, 2.5V, 3V depending on (x & 0x3)
	54	* As regulator framework doesn't accept voltages to be 0V, we use 1uV.
	55	*/
	56	static int v6_voltages_uv[] = { 1, 1800000, 2500000, 3000000 };
	57
55f4fa4e RJ	58	/*
	59	* V3 voltage
	60	* On I2C bus, sending a "x" byte to the max1586 means :
	61	* set V3 to 0.700V + (x & 0x1f) * 0.025V
b110a8fb PZ	62	* This voltage can be increased by external resistors
	63	* R24 and R25=100kOhm as described in the data sheet.
	64	* The gain is approximately: 1 + R24/R25 + R24/185.5kOhm
55f4fa4e	65	*/
9b558950 AL	66	static int max1586_v3_set_voltage_sel(struct regulator_dev *rdev,
9b558950 AL	67	unsigned selector)
55f4fa4e	68	{
b110a8fb PZ	69	struct max1586_data *max1586 = rdev_get_drvdata(rdev);
b110a8fb PZ	70	struct i2c_client *client = max1586->client;
55f4fa4e RJ	71	u8 v3_prog;
55f4fa4e RJ	72
55f4fa4e	73	dev_dbg(&client->dev, "changing voltage v3 to %dmv\n",
9b558950	74	regulator_list_voltage_linear(rdev, selector) / 1000);
55f4fa4e	75
9b558950	76	v3_prog = I2C_V3_SELECT \| (u8) selector;
55f4fa4e RJ	77	return i2c_smbus_write_byte(client, v3_prog);
	78	}
	79
0d032731 AL	80	static int max1586_v6_set_voltage_sel(struct regulator_dev *rdev,
0d032731 AL	81	unsigned int selector)
55f4fa4e RJ	82	{
55f4fa4e RJ	83	struct i2c_client *client = rdev_get_drvdata(rdev);
55f4fa4e RJ	84	u8 v6_prog;
55f4fa4e RJ	85
55f4fa4e	86	dev_dbg(&client->dev, "changing voltage v6 to %dmv\n",
0d032731	87	rdev->desc->volt_table[selector] / 1000);
55f4fa4e	88
0d032731	89	v6_prog = I2C_V6_SELECT \| (u8) selector;
55f4fa4e RJ	90	return i2c_smbus_write_byte(client, v6_prog);
	91	}
	92
55f4fa4e RJ	93	/*
	94	* The Maxim 1586 controls V3 and V6 voltages, but offers no way of reading back
	95	* the set up value.
	96	*/
	97	static struct regulator_ops max1586_v3_ops = {
9b558950	98	.set_voltage_sel = max1586_v3_set_voltage_sel,
93f5de5c	99	.list_voltage = regulator_list_voltage_linear,
9b558950	100	.map_voltage = regulator_map_voltage_linear,
55f4fa4e RJ	101	};
	102
	103	static struct regulator_ops max1586_v6_ops = {
0d032731	104	.set_voltage_sel = max1586_v6_set_voltage_sel,
96d25221	105	.list_voltage = regulator_list_voltage_table,
55f4fa4e RJ	106	};
55f4fa4e RJ	107
93f5de5c	108	static struct regulator_desc max1586_reg[] = {
55f4fa4e RJ	109	{
	110	.name = "Output_V3",
	111	.id = MAX1586_V3,
	112	.ops = &max1586_v3_ops,
	113	.type = REGULATOR_VOLTAGE,
	114	.n_voltages = MAX1586_V3_MAX_VSEL + 1,
	115	.owner = THIS_MODULE,
	116	},
	117	{
	118	.name = "Output_V6",
	119	.id = MAX1586_V6,
	120	.ops = &max1586_v6_ops,
	121	.type = REGULATOR_VOLTAGE,
	122	.n_voltages = MAX1586_V6_MAX_VSEL + 1,
96d25221	123	.volt_table = v6_voltages_uv,
55f4fa4e RJ	124	.owner = THIS_MODULE,
	125	},
	126	};
	127
bd88c9b2 DT	128	static int __devinit max1586_pmic_probe(struct i2c_client *client,
bd88c9b2 DT	129	const struct i2c_device_id *i2c_id)
55f4fa4e RJ	130	{
	131	struct regulator_dev **rdev;
	132	struct max1586_platform_data *pdata = client->dev.platform_data;
c172708d	133	struct regulator_config config = { };
b110a8fb PZ	134	struct max1586_data *max1586;
	135	int i, id, ret = -ENOMEM;
	136
b7bd05b8	137	max1586 = devm_kzalloc(&client->dev, sizeof(struct max1586_data) +
b110a8fb PZ	138	sizeof(struct regulator_dev ) (MAX1586_V6 + 1),
	139	GFP_KERNEL);
	140	if (!max1586)
b7bd05b8	141	return -ENOMEM;
55f4fa4e	142
b110a8fb	143	max1586->client = client;
55f4fa4e	144
b7bd05b8 AL	145	if (!pdata->v3_gain)
	146	return -EINVAL;
	147
c8f1e502 PZ	148	max1586->min_uV = MAX1586_V3_MIN_UV / 1000 * pdata->v3_gain / 1000;
c8f1e502 PZ	149	max1586->max_uV = MAX1586_V3_MAX_UV / 1000 * pdata->v3_gain / 1000;
b110a8fb PZ	150
b110a8fb PZ	151	rdev = max1586->rdev;
55f4fa4e RJ	152	for (i = 0; i < pdata->num_subdevs && i <= MAX1586_V6; i++) {
	153	id = pdata->subdevs[i].id;
	154	if (!pdata->subdevs[i].platform_data)
	155	continue;
	156	if (id < MAX1586_V3 \|\| id > MAX1586_V6) {
	157	dev_err(&client->dev, "invalid regulator id %d\n", id);
	158	goto err;
	159	}
c172708d	160
93f5de5c AL	161	if (id == MAX1586_V3) {
	162	max1586_reg[id].min_uV = max1586->min_uV;
	163	max1586_reg[id].uV_step =
	164	(max1586->max_uV - max1586->min_uV) /
	165	MAX1586_V3_MAX_VSEL;
	166	}
	167
c172708d MB	168	config.dev = &client->dev;
	169	config.init_data = pdata->subdevs[i].platform_data;
	170	config.driver_data = max1586;
	171
	172	rdev[i] = regulator_register(&max1586_reg[id], &config);
55f4fa4e RJ	173	if (IS_ERR(rdev[i])) {
	174	ret = PTR_ERR(rdev[i]);
	175	dev_err(&client->dev, "failed to register %s\n",
	176	max1586_reg[id].name);
	177	goto err;
	178	}
	179	}
	180
7c4c25e4	181	i2c_set_clientdata(client, max1586);
55f4fa4e RJ	182	dev_info(&client->dev, "Maxim 1586 regulator driver loaded\n");
	183	return 0;
	184
	185	err:
	186	while (--i >= 0)
	187	regulator_unregister(rdev[i]);
55f4fa4e RJ	188	return ret;
	189	}
	190
bd88c9b2	191	static int __devexit max1586_pmic_remove(struct i2c_client *client)
55f4fa4e	192	{
7c4c25e4	193	struct max1586_data *max1586 = i2c_get_clientdata(client);
55f4fa4e RJ	194	int i;
	195
	196	for (i = 0; i <= MAX1586_V6; i++)
7c4c25e4 AL	197	if (max1586->rdev[i])
7c4c25e4 AL	198	regulator_unregister(max1586->rdev[i]);
55f4fa4e RJ	199	return 0;
	200	}
	201
	202	static const struct i2c_device_id max1586_id[] = {
	203	{ "max1586", 0 },
	204	{ }
	205	};
	206	MODULE_DEVICE_TABLE(i2c, max1586_id);
	207
	208	static struct i2c_driver max1586_pmic_driver = {
	209	.probe = max1586_pmic_probe,
5eb9f2b9	210	.remove = max1586_pmic_remove,
55f4fa4e RJ	211	.driver = {
55f4fa4e RJ	212	.name = "max1586",
bd88c9b2	213	.owner = THIS_MODULE,
55f4fa4e RJ	214	},
	215	.id_table = max1586_id,
	216	};
	217
	218	static int __init max1586_pmic_init(void)
	219	{
	220	return i2c_add_driver(&max1586_pmic_driver);
	221	}
	222	subsys_initcall(max1586_pmic_init);
	223
	224	static void __exit max1586_pmic_exit(void)
	225	{
	226	i2c_del_driver(&max1586_pmic_driver);
	227	}
	228	module_exit(max1586_pmic_exit);
	229
	230	/* Module information */
	231	MODULE_DESCRIPTION("MAXIM 1586 voltage regulator driver");
	232	MODULE_AUTHOR("Robert Jarzmik");
	233	MODULE_LICENSE("GPL");