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authorMark Brown <broonie@opensource.wolfsonmicro.com>2008-04-30 19:27:12 +0400
committerLiam Girdwood <lg@opensource.wolfsonmicro.com>2008-07-30 13:10:21 +0400
commit4b74ff6512492dedea353f89d9b56cb715df0d7f (patch)
tree6f39d7624cd0c55116f39e7376240839fc078d92 /drivers/regulator/fixed.c
parent414c70cb91c445ec813b61e16fe4882807e40240 (diff)
downloadlinux-4b74ff6512492dedea353f89d9b56cb715df0d7f.tar.xz
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/fixed.c')
-rw-r--r--drivers/regulator/fixed.c129
1 files changed, 129 insertions, 0 deletions
diff --git a/drivers/regulator/fixed.c b/drivers/regulator/fixed.c
new file mode 100644
index 000000000000..d31db3e14913
--- /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(&regulator_fixed_voltage_driver);
+}
+module_init(regulator_fixed_voltage_init);
+
+static void __exit regulator_fixed_voltage_exit(void)
+{
+ platform_driver_unregister(&regulator_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");