diff options
author | Mark Brown <broonie@opensource.wolfsonmicro.com> | 2008-04-30 16:27:12 +0100 |
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committer | Liam Girdwood <lg@opensource.wolfsonmicro.com> | 2008-07-30 10:10:21 +0100 |
commit | 4b74ff6512492dedea353f89d9b56cb715df0d7f (patch) | |
tree | 6f39d7624cd0c55116f39e7376240839fc078d92 /drivers/regulator | |
parent | 414c70cb91c445ec813b61e16fe4882807e40240 (diff) | |
download | kernel_samsung_aries-4b74ff6512492dedea353f89d9b56cb715df0d7f.zip kernel_samsung_aries-4b74ff6512492dedea353f89d9b56cb715df0d7f.tar.gz kernel_samsung_aries-4b74ff6512492dedea353f89d9b56cb715df0d7f.tar.bz2 |
regulator: add support for fixed regulators.
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>
Diffstat (limited to 'drivers/regulator')
-rw-r--r-- | drivers/regulator/fixed.c | 129 |
1 files changed, 129 insertions, 0 deletions
diff --git a/drivers/regulator/fixed.c b/drivers/regulator/fixed.c new file mode 100644 index 0000000..d31db3e --- /dev/null +++ b/drivers/regulator/fixed.c @@ -0,0 +1,129 @@ +/* + * 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"); |