4b74ff6512
This adds supports for regulator that are not software controlable. It allows them to coexist in systems with mixed supplies. Signed-off-by: Mark Brown <broonie@opensource.wolfsonmicro.com> Signed-off-by: Mike Rapoport <mike@compulab.co.il> Signed-off-by: Liam Girdwood <lg@opensource.wolfsonmicro.com>
130 lines
3.1 KiB
C
130 lines
3.1 KiB
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(®ulator_fixed_voltage_driver);
|
|
}
|
|
module_init(regulator_fixed_voltage_init);
|
|
|
|
static void __exit regulator_fixed_voltage_exit(void)
|
|
{
|
|
platform_driver_unregister(®ulator_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");
|