/* * 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");