| /* |
| * 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, &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(®ulator_fixed_voltage_driver); |
| } |
| subsys_initcall(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"); |