[deliverable/linux.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 struct regulator_ops fixed_voltage_ops = {
	.is_enabled = fixed_voltage_is_enabled,
	.enable = fixed_voltage_enable,
	.get_voltage = fixed_voltage_get_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->microvolts = config->microvolts;

	drvdata->dev = regulator_register(&drvdata->desc, 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);
}
module_init(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
	47	static struct regulator_ops fixed_voltage_ops = {
	48	.is_enabled = fixed_voltage_is_enabled,
	49	.enable = fixed_voltage_enable,
	50	.get_voltage = fixed_voltage_get_voltage,
	51	};
	52
	53	static int regulator_fixed_voltage_probe(struct platform_device *pdev)
	54	{
	55	struct fixed_voltage_config *config = pdev->dev.platform_data;
	56	struct fixed_voltage_data *drvdata;
	57	int ret;
	58
	59	drvdata = kzalloc(sizeof(struct fixed_voltage_data), GFP_KERNEL);
	60	if (drvdata == NULL) {
	61	ret = -ENOMEM;
	62	goto err;
	63	}
	64
65	drvdata->desc.name = kstrdup(config->supply_name, GFP_KERNEL);
66	if (drvdata->desc.name == NULL) {
67	ret = -ENOMEM;
68	goto err;
69	}
70	drvdata->desc.type = REGULATOR_VOLTAGE;
71	drvdata->desc.owner = THIS_MODULE;
72	drvdata->desc.ops = &fixed_voltage_ops,
73
74	drvdata->microvolts = config->microvolts;
75
76	drvdata->dev = regulator_register(&drvdata->desc, drvdata);
77	if (IS_ERR(drvdata->dev)) {
78	ret = PTR_ERR(drvdata->dev);
79	goto err_name;
80	}
81
82	platform_set_drvdata(pdev, drvdata);
83
84	dev_dbg(&pdev->dev, "%s supplying %duV\n", drvdata->desc.name,
85	drvdata->microvolts);
86
87	return 0;
88
89	err_name:
90	kfree(drvdata->desc.name);
91	err:
92	kfree(drvdata);
93	return ret;
94	}
95
96	static int regulator_fixed_voltage_remove(struct platform_device *pdev)
97	{
98	struct fixed_voltage_data *drvdata = platform_get_drvdata(pdev);
99
100	regulator_unregister(drvdata->dev);
101	kfree(drvdata->desc.name);
102	kfree(drvdata);
103
104	return 0;
105	}
106
107	static struct platform_driver regulator_fixed_voltage_driver = {
108	.probe = regulator_fixed_voltage_probe,
109	.remove = regulator_fixed_voltage_remove,
110	.driver = {
111	.name = "reg-fixed-voltage",
112	},
113	};
114
115	static int __init regulator_fixed_voltage_init(void)
116	{
117	return platform_driver_register(&regulator_fixed_voltage_driver);
118	}
119	module_init(regulator_fixed_voltage_init);
120
121	static void __exit regulator_fixed_voltage_exit(void)
122	{
123	platform_driver_unregister(&regulator_fixed_voltage_driver);
124	}
125	module_exit(regulator_fixed_voltage_exit);
126
127	MODULE_AUTHOR("Mark Brown <broonie@opensource.wolfsonmicro.com>");
128	MODULE_DESCRIPTION("Fixed voltage regulator");
129	MODULE_LICENSE("GPL");