drivers/regulator/max1586.c - maze/linux - Git at Google

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

 	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, max1586);
 	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 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]);
 	kfree(max1586);

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

	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, max1586);
	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 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]);
	kfree(max1586);

	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");