[linux-2.6-block.git] / drivers / regulator / fixed.c

/*
 * fixed.c
 *
 * Copyright 2008 Wolfson Microelectronics PLC.
 *
 * Author: Mark Brown <broonie@opensource.wolfsonmicro.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; either version 2 of the
 * License, or (at your option) any later version.
 *
 * This is useful for systems with mixed controllable and
 * non-controllable regulators, as well as for allowing testing on
 * systems with no controllable regulators.
 */

#include <linux/err.h>
#include <linux/mutex.h>
#include <linux/platform_device.h>
#include <linux/regulator/driver.h>
#include <linux/regulator/fixed.h>

struct fixed_voltage_data {
	struct regulator_desc desc;
	struct regulator_dev *dev;
	int microvolts;
};

static int fixed_voltage_is_enabled(struct regulator_dev *dev)
{
	return 1;
}

static int fixed_voltage_enable(struct regulator_dev *dev)
{
	return 0;
}

static int fixed_voltage_get_voltage(struct regulator_dev *dev)
{
	struct fixed_voltage_data *data = rdev_get_drvdata(dev);

	return data->microvolts;
}

static int fixed_voltage_list_voltage(struct regulator_dev *dev,
				      unsigned selector)
{
	struct fixed_voltage_data *data = rdev_get_drvdata(dev);

	if (selector != 0)
		return -EINVAL;

	return data->microvolts;
}

static struct regulator_ops fixed_voltage_ops = {
	.is_enabled = fixed_voltage_is_enabled,
	.enable = fixed_voltage_enable,
	.get_voltage = fixed_voltage_get_voltage,
	.list_voltage = fixed_voltage_list_voltage,
};

static int regulator_fixed_voltage_probe(struct platform_device *pdev)
{
	struct fixed_voltage_config *config = pdev->dev.platform_data;
	struct fixed_voltage_data *drvdata;
	int ret;

	drvdata = kzalloc(sizeof(struct fixed_voltage_data), GFP_KERNEL);
	if (drvdata == NULL) {
		ret = -ENOMEM;
		goto err;
	}

	drvdata->desc.name = kstrdup(config->supply_name, GFP_KERNEL);
	if (drvdata->desc.name == NULL) {
		ret = -ENOMEM;
		goto err;
	}
	drvdata->desc.type = REGULATOR_VOLTAGE;
	drvdata->desc.owner = THIS_MODULE;
	drvdata->desc.ops = &fixed_voltage_ops;
	drvdata->desc.n_voltages = 1;

	drvdata->microvolts = config->microvolts;

	drvdata->dev = regulator_register(&drvdata->desc, &pdev->dev,
					  config->init_data, drvdata);
	if (IS_ERR(drvdata->dev)) {
		ret = PTR_ERR(drvdata->dev);
		goto err_name;
	}

	platform_set_drvdata(pdev, drvdata);

	dev_dbg(&pdev->dev, "%s supplying %duV\n", drvdata->desc.name,
		drvdata->microvolts);

	return 0;

err_name:
	kfree(drvdata->desc.name);
err:
	kfree(drvdata);
	return ret;
}

static int regulator_fixed_voltage_remove(struct platform_device *pdev)
{
	struct fixed_voltage_data *drvdata = platform_get_drvdata(pdev);

	regulator_unregister(drvdata->dev);
	kfree(drvdata->desc.name);
	kfree(drvdata);

	return 0;
}

static struct platform_driver regulator_fixed_voltage_driver = {
	.probe		= regulator_fixed_voltage_probe,
	.remove		= regulator_fixed_voltage_remove,
	.driver		= {
		.name		= "reg-fixed-voltage",
	},
};

static int __init regulator_fixed_voltage_init(void)
{
	return platform_driver_register(&regulator_fixed_voltage_driver);
}
subsys_initcall(regulator_fixed_voltage_init);

static void __exit regulator_fixed_voltage_exit(void)
{
	platform_driver_unregister(&regulator_fixed_voltage_driver);
}
module_exit(regulator_fixed_voltage_exit);

MODULE_AUTHOR("Mark Brown <broonie@opensource.wolfsonmicro.com>");
MODULE_DESCRIPTION("Fixed voltage regulator");
MODULE_LICENSE("GPL");
Commit	Line	Data
4b74ff65 MB	1	/*
	2	* fixed.c
	3	*
	4	* Copyright 2008 Wolfson Microelectronics PLC.
	5	*
	6	* Author: Mark Brown <broonie@opensource.wolfsonmicro.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; either version 2 of the
	11	* License, or (at your option) any later version.
	12	*
	13	* This is useful for systems with mixed controllable and
	14	* non-controllable regulators, as well as for allowing testing on
	15	* systems with no controllable regulators.
	16	*/
	17
	18	#include <linux/err.h>
	19	#include <linux/mutex.h>
	20	#include <linux/platform_device.h>
	21	#include <linux/regulator/driver.h>
	22	#include <linux/regulator/fixed.h>
	23
	24	struct fixed_voltage_data {
	25	struct regulator_desc desc;
	26	struct regulator_dev *dev;
	27	int microvolts;
	28	};
	29
	30	static int fixed_voltage_is_enabled(struct regulator_dev *dev)
	31	{
	32	return 1;
	33	}
	34
	35	static int fixed_voltage_enable(struct regulator_dev *dev)
	36	{
	37	return 0;
	38	}
	39
	40	static int fixed_voltage_get_voltage(struct regulator_dev *dev)
	41	{
	42	struct fixed_voltage_data *data = rdev_get_drvdata(dev);
	43
	44	return data->microvolts;
	45	}
	46
9035cefc MB	47	static int fixed_voltage_list_voltage(struct regulator_dev *dev,
	48	unsigned selector)
	49	{
	50	struct fixed_voltage_data *data = rdev_get_drvdata(dev);
	51
	52	if (selector != 0)
	53	return -EINVAL;
	54
	55	return data->microvolts;
	56	}
	57
4b74ff65 MB	58	static struct regulator_ops fixed_voltage_ops = {
	59	.is_enabled = fixed_voltage_is_enabled,
	60	.enable = fixed_voltage_enable,
	61	.get_voltage = fixed_voltage_get_voltage,
9035cefc	62	.list_voltage = fixed_voltage_list_voltage,
4b74ff65 MB	63	};
	64
	65	static int regulator_fixed_voltage_probe(struct platform_device *pdev)
	66	{
	67	struct fixed_voltage_config *config = pdev->dev.platform_data;
	68	struct fixed_voltage_data *drvdata;
	69	int ret;
	70
	71	drvdata = kzalloc(sizeof(struct fixed_voltage_data), GFP_KERNEL);
	72	if (drvdata == NULL) {
	73	ret = -ENOMEM;
	74	goto err;
	75	}
	76
	77	drvdata->desc.name = kstrdup(config->supply_name, GFP_KERNEL);
	78	if (drvdata->desc.name == NULL) {
	79	ret = -ENOMEM;
	80	goto err;
	81	}
	82	drvdata->desc.type = REGULATOR_VOLTAGE;
	83	drvdata->desc.owner = THIS_MODULE;
9035cefc MB	84	drvdata->desc.ops = &fixed_voltage_ops;
9035cefc MB	85	drvdata->desc.n_voltages = 1;
4b74ff65 MB	86
	87	drvdata->microvolts = config->microvolts;
	88
bcf3402c MB	89	drvdata->dev = regulator_register(&drvdata->desc, &pdev->dev,
bcf3402c MB	90	config->init_data, drvdata);
4b74ff65 MB	91	if (IS_ERR(drvdata->dev)) {
	92	ret = PTR_ERR(drvdata->dev);
	93	goto err_name;
	94	}
	95
	96	platform_set_drvdata(pdev, drvdata);
	97
	98	dev_dbg(&pdev->dev, "%s supplying %duV\n", drvdata->desc.name,
	99	drvdata->microvolts);
	100
	101	return 0;
	102
	103	err_name:
	104	kfree(drvdata->desc.name);
	105	err:
	106	kfree(drvdata);
	107	return ret;
	108	}
	109
	110	static int regulator_fixed_voltage_remove(struct platform_device *pdev)
	111	{
	112	struct fixed_voltage_data *drvdata = platform_get_drvdata(pdev);
	113
	114	regulator_unregister(drvdata->dev);
	115	kfree(drvdata->desc.name);
	116	kfree(drvdata);
	117
	118	return 0;
	119	}
	120
	121	static struct platform_driver regulator_fixed_voltage_driver = {
	122	.probe = regulator_fixed_voltage_probe,
	123	.remove = regulator_fixed_voltage_remove,
	124	.driver = {
	125	.name = "reg-fixed-voltage",
	126	},
	127	};
	128
	129	static int __init regulator_fixed_voltage_init(void)
	130	{
	131	return platform_driver_register(&regulator_fixed_voltage_driver);
	132	}
5a1b22be	133	subsys_initcall(regulator_fixed_voltage_init);
4b74ff65 MB	134
	135	static void __exit regulator_fixed_voltage_exit(void)
	136	{
	137	platform_driver_unregister(&regulator_fixed_voltage_driver);
	138	}
	139	module_exit(regulator_fixed_voltage_exit);
	140
	141	MODULE_AUTHOR("Mark Brown <broonie@opensource.wolfsonmicro.com>");
	142	MODULE_DESCRIPTION("Fixed voltage regulator");
	143	MODULE_LICENSE("GPL");