[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/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 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 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]);
	kfree(rdev);
	i2c_set_clientdata(client, NULL);

	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",
	},
	.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>
	25	#include <linux/regulator/max1586.h>
	26
	27	#define MAX1586_V3_MAX_VSEL 31
	28	#define MAX1586_V6_MAX_VSEL 3
	29
	30	#define MAX1586_V3_MIN_UV 700000
	31	#define MAX1586_V3_MAX_UV 1475000
55f4fa4e RJ	32
	33	#define MAX1586_V6_MIN_UV 0
	34	#define MAX1586_V6_MAX_UV 3000000
	35
	36	#define I2C_V3_SELECT (0 << 5)
	37	#define I2C_V6_SELECT (1 << 5)
	38
b110a8fb PZ	39	struct max1586_data {
	40	struct i2c_client *client;
	41
	42	/* min/max V3 voltage */
c8f1e502 PZ	43	unsigned int min_uV;
c8f1e502 PZ	44	unsigned int max_uV;
b110a8fb PZ	45
	46	struct regulator_dev *rdev[0];
	47	};
	48
55f4fa4e RJ	49	/*
	50	* V3 voltage
	51	* On I2C bus, sending a "x" byte to the max1586 means :
	52	* set V3 to 0.700V + (x & 0x1f) * 0.025V
b110a8fb PZ	53	* This voltage can be increased by external resistors
	54	* R24 and R25=100kOhm as described in the data sheet.
	55	* The gain is approximately: 1 + R24/R25 + R24/185.5kOhm
55f4fa4e	56	*/
b110a8fb PZ	57	static int max1586_v3_calc_voltage(struct max1586_data *max1586,
b110a8fb PZ	58	unsigned selector)
55f4fa4e	59	{
b110a8fb PZ	60	unsigned range_uV = max1586->max_uV - max1586->min_uV;
	61
	62	return max1586->min_uV + (selector * range_uV / MAX1586_V3_MAX_VSEL);
55f4fa4e RJ	63	}
	64
	65	static int max1586_v3_set(struct regulator_dev *rdev, int min_uV, int max_uV)
	66	{
b110a8fb PZ	67	struct max1586_data *max1586 = rdev_get_drvdata(rdev);
	68	struct i2c_client *client = max1586->client;
	69	unsigned range_uV = max1586->max_uV - max1586->min_uV;
55f4fa4e RJ	70	unsigned selector;
	71	u8 v3_prog;
	72
b110a8fb	73	if (min_uV > max1586->max_uV \|\| max_uV < max1586->min_uV)
55f4fa4e	74	return -EINVAL;
b110a8fb PZ	75	if (min_uV < max1586->min_uV)
b110a8fb PZ	76	min_uV = max1586->min_uV;
55f4fa4e	77
b110a8fb PZ	78	selector = ((min_uV - max1586->min_uV) * MAX1586_V3_MAX_VSEL +
	79	range_uV - 1) / range_uV;
	80	if (max1586_v3_calc_voltage(max1586, selector) > max_uV)
55f4fa4e RJ	81	return -EINVAL;
	82
	83	dev_dbg(&client->dev, "changing voltage v3 to %dmv\n",
b110a8fb	84	max1586_v3_calc_voltage(max1586, selector) / 1000);
55f4fa4e RJ	85
	86	v3_prog = I2C_V3_SELECT \| (u8) selector;
	87	return i2c_smbus_write_byte(client, v3_prog);
	88	}
	89
	90	static int max1586_v3_list(struct regulator_dev *rdev, unsigned selector)
	91	{
b110a8fb PZ	92	struct max1586_data *max1586 = rdev_get_drvdata(rdev);
b110a8fb PZ	93
55f4fa4e RJ	94	if (selector > MAX1586_V3_MAX_VSEL)
55f4fa4e RJ	95	return -EINVAL;
b110a8fb	96	return max1586_v3_calc_voltage(max1586, selector);
55f4fa4e RJ	97	}
	98
	99	/*
	100	* V6 voltage
	101	* On I2C bus, sending a "x" byte to the max1586 means :
	102	* set V6 to either 0V, 1.8V, 2.5V, 3V depending on (x & 0x3)
	103	* As regulator framework doesn't accept voltages to be 0V, we use 1uV.
	104	*/
	105	static int max1586_v6_calc_voltage(unsigned selector)
	106	{
	107	static int voltages_uv[] = { 1, 1800000, 2500000, 3000000 };
	108
	109	return voltages_uv[selector];
	110	}
	111
	112	static int max1586_v6_set(struct regulator_dev *rdev, int min_uV, int max_uV)
	113	{
	114	struct i2c_client *client = rdev_get_drvdata(rdev);
	115	unsigned selector;
	116	u8 v6_prog;
	117
	118	if (min_uV < MAX1586_V6_MIN_UV \|\| min_uV > MAX1586_V6_MAX_UV)
	119	return -EINVAL;
	120	if (max_uV < MAX1586_V6_MIN_UV \|\| max_uV > MAX1586_V6_MAX_UV)
	121	return -EINVAL;
	122
	123	if (min_uV >= 3000000)
	124	selector = 3;
	125	if (min_uV < 3000000)
	126	selector = 2;
	127	if (min_uV < 2500000)
	128	selector = 1;
	129	if (min_uV < 1800000)
	130	selector = 0;
	131
	132	if (max1586_v6_calc_voltage(selector) > max_uV)
	133	return -EINVAL;
	134
	135	dev_dbg(&client->dev, "changing voltage v6 to %dmv\n",
	136	max1586_v6_calc_voltage(selector) / 1000);
	137
	138	v6_prog = I2C_V6_SELECT \| (u8) selector;
	139	return i2c_smbus_write_byte(client, v6_prog);
	140	}
	141
	142	static int max1586_v6_list(struct regulator_dev *rdev, unsigned selector)
	143	{
	144	if (selector > MAX1586_V6_MAX_VSEL)
	145	return -EINVAL;
	146	return max1586_v6_calc_voltage(selector);
	147	}
	148
	149	/*
	150	* The Maxim 1586 controls V3 and V6 voltages, but offers no way of reading back
	151	* the set up value.
	152	*/
	153	static struct regulator_ops max1586_v3_ops = {
	154	.set_voltage = max1586_v3_set,
	155	.list_voltage = max1586_v3_list,
	156	};
	157
	158	static struct regulator_ops max1586_v6_ops = {
	159	.set_voltage = max1586_v6_set,
	160	.list_voltage = max1586_v6_list,
161	};
162
163	static struct regulator_desc max1586_reg[] = {
164	{
165	.name = "Output_V3",
166	.id = MAX1586_V3,
167	.ops = &max1586_v3_ops,
168	.type = REGULATOR_VOLTAGE,
169	.n_voltages = MAX1586_V3_MAX_VSEL + 1,
170	.owner = THIS_MODULE,
171	},
172	{
173	.name = "Output_V6",
174	.id = MAX1586_V6,
175	.ops = &max1586_v6_ops,
176	.type = REGULATOR_VOLTAGE,
177	.n_voltages = MAX1586_V6_MAX_VSEL + 1,
178	.owner = THIS_MODULE,
179	},
180	};
181
182	static int max1586_pmic_probe(struct i2c_client *client,
183	const struct i2c_device_id *i2c_id)
184	{
185	struct regulator_dev **rdev;
186	struct max1586_platform_data *pdata = client->dev.platform_data;
b110a8fb PZ	187	struct max1586_data *max1586;
	188	int i, id, ret = -ENOMEM;
	189
	190	max1586 = kzalloc(sizeof(struct max1586_data) +
	191	sizeof(struct regulator_dev ) (MAX1586_V6 + 1),
	192	GFP_KERNEL);
	193	if (!max1586)
	194	goto out;
55f4fa4e	195
b110a8fb	196	max1586->client = client;
55f4fa4e	197
b110a8fb PZ	198	if (!pdata->v3_gain) {
	199	ret = -EINVAL;
	200	goto out_unmap;
	201	}
c8f1e502 PZ	202	max1586->min_uV = MAX1586_V3_MIN_UV / 1000 * pdata->v3_gain / 1000;
c8f1e502 PZ	203	max1586->max_uV = MAX1586_V3_MAX_UV / 1000 * pdata->v3_gain / 1000;
b110a8fb PZ	204
b110a8fb PZ	205	rdev = max1586->rdev;
55f4fa4e RJ	206	for (i = 0; i < pdata->num_subdevs && i <= MAX1586_V6; i++) {
	207	id = pdata->subdevs[i].id;
	208	if (!pdata->subdevs[i].platform_data)
	209	continue;
	210	if (id < MAX1586_V3 \|\| id > MAX1586_V6) {
	211	dev_err(&client->dev, "invalid regulator id %d\n", id);
	212	goto err;
	213	}
	214	rdev[i] = regulator_register(&max1586_reg[id], &client->dev,
	215	pdata->subdevs[i].platform_data,
b110a8fb	216	max1586);
55f4fa4e RJ	217	if (IS_ERR(rdev[i])) {
	218	ret = PTR_ERR(rdev[i]);
	219	dev_err(&client->dev, "failed to register %s\n",
	220	max1586_reg[id].name);
	221	goto err;
	222	}
	223	}
	224
	225	i2c_set_clientdata(client, rdev);
	226	dev_info(&client->dev, "Maxim 1586 regulator driver loaded\n");
	227	return 0;
	228
	229	err:
	230	while (--i >= 0)
	231	regulator_unregister(rdev[i]);
b110a8fb PZ	232	out_unmap:
	233	kfree(max1586);
	234	out:
55f4fa4e RJ	235	return ret;
	236	}
	237
	238	static int max1586_pmic_remove(struct i2c_client *client)
	239	{
	240	struct regulator_dev **rdev = i2c_get_clientdata(client);
	241	int i;
	242
	243	for (i = 0; i <= MAX1586_V6; i++)
	244	if (rdev[i])
	245	regulator_unregister(rdev[i]);
	246	kfree(rdev);
	247	i2c_set_clientdata(client, NULL);
	248
	249	return 0;
	250	}
	251
	252	static const struct i2c_device_id max1586_id[] = {
	253	{ "max1586", 0 },
	254	{ }
	255	};
	256	MODULE_DEVICE_TABLE(i2c, max1586_id);
	257
	258	static struct i2c_driver max1586_pmic_driver = {
	259	.probe = max1586_pmic_probe,
	260	.remove = max1586_pmic_remove,
	261	.driver = {
	262	.name = "max1586",
	263	},
	264	.id_table = max1586_id,
	265	};
	266
	267	static int __init max1586_pmic_init(void)
	268	{
	269	return i2c_add_driver(&max1586_pmic_driver);
	270	}
	271	subsys_initcall(max1586_pmic_init);
	272
	273	static void __exit max1586_pmic_exit(void)
	274	{
	275	i2c_del_driver(&max1586_pmic_driver);
	276	}
	277	module_exit(max1586_pmic_exit);
	278
	279	/* Module information */
	280	MODULE_DESCRIPTION("MAXIM 1586 voltage regulator driver");
	281	MODULE_AUTHOR("Robert Jarzmik");
	282	MODULE_LICENSE("GPL");