130 lines
3.1 KiB
C
130 lines
3.1 KiB
C
/*
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* fixed.c
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*
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* Copyright 2008 Wolfson Microelectronics PLC.
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*
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* Author: Mark Brown <broonie@opensource.wolfsonmicro.com>
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*
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* This program is free software; you can redistribute it and/or
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* modify it under the terms of the GNU General Public License as
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* published by the Free Software Foundation; either version 2 of the
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* License, or (at your option) any later version.
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*
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* This is useful for systems with mixed controllable and
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* non-controllable regulators, as well as for allowing testing on
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* systems with no controllable regulators.
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*/
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#include <linux/err.h>
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#include <linux/mutex.h>
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#include <linux/platform_device.h>
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#include <linux/regulator/driver.h>
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#include <linux/regulator/fixed.h>
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struct fixed_voltage_data {
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struct regulator_desc desc;
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struct regulator_dev *dev;
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int microvolts;
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};
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static int fixed_voltage_is_enabled(struct regulator_dev *dev)
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{
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return 1;
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}
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static int fixed_voltage_enable(struct regulator_dev *dev)
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{
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return 0;
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}
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static int fixed_voltage_get_voltage(struct regulator_dev *dev)
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{
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struct fixed_voltage_data *data = rdev_get_drvdata(dev);
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return data->microvolts;
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}
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static struct regulator_ops fixed_voltage_ops = {
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.is_enabled = fixed_voltage_is_enabled,
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.enable = fixed_voltage_enable,
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.get_voltage = fixed_voltage_get_voltage,
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};
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static int regulator_fixed_voltage_probe(struct platform_device *pdev)
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{
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struct fixed_voltage_config *config = pdev->dev.platform_data;
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struct fixed_voltage_data *drvdata;
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int ret;
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drvdata = kzalloc(sizeof(struct fixed_voltage_data), GFP_KERNEL);
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if (drvdata == NULL) {
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ret = -ENOMEM;
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goto err;
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}
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drvdata->desc.name = kstrdup(config->supply_name, GFP_KERNEL);
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if (drvdata->desc.name == NULL) {
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ret = -ENOMEM;
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goto err;
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}
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drvdata->desc.type = REGULATOR_VOLTAGE;
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drvdata->desc.owner = THIS_MODULE;
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drvdata->desc.ops = &fixed_voltage_ops,
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drvdata->microvolts = config->microvolts;
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drvdata->dev = regulator_register(&drvdata->desc, drvdata);
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if (IS_ERR(drvdata->dev)) {
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ret = PTR_ERR(drvdata->dev);
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goto err_name;
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}
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platform_set_drvdata(pdev, drvdata);
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dev_dbg(&pdev->dev, "%s supplying %duV\n", drvdata->desc.name,
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drvdata->microvolts);
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return 0;
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err_name:
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kfree(drvdata->desc.name);
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err:
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kfree(drvdata);
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return ret;
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}
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static int regulator_fixed_voltage_remove(struct platform_device *pdev)
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{
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struct fixed_voltage_data *drvdata = platform_get_drvdata(pdev);
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regulator_unregister(drvdata->dev);
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kfree(drvdata->desc.name);
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kfree(drvdata);
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return 0;
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}
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static struct platform_driver regulator_fixed_voltage_driver = {
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.probe = regulator_fixed_voltage_probe,
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.remove = regulator_fixed_voltage_remove,
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.driver = {
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.name = "reg-fixed-voltage",
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},
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};
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static int __init regulator_fixed_voltage_init(void)
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{
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return platform_driver_register(®ulator_fixed_voltage_driver);
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}
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module_init(regulator_fixed_voltage_init);
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static void __exit regulator_fixed_voltage_exit(void)
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{
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platform_driver_unregister(®ulator_fixed_voltage_driver);
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}
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module_exit(regulator_fixed_voltage_exit);
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MODULE_AUTHOR("Mark Brown <broonie@opensource.wolfsonmicro.com>");
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MODULE_DESCRIPTION("Fixed voltage regulator");
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MODULE_LICENSE("GPL");
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