Linux kernel mirror (for testing)
git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git
tjh.dev
kernel
os
linux
1/*
2 * fixed.c
3 *
4 * Copyright 2008 Wolfson Microelectronics PLC.
5 *
6 * Author: Mark Brown <broonie@opensource.wolfsonmicro.com>
7 *
8 * This program is free software; you can redistribute it and/or
9 * modify it under the terms of the GNU General Public License as
10 * published by the Free Software Foundation; either version 2 of the
11 * License, or (at your option) any later version.
12 *
13 * This is useful for systems with mixed controllable and
14 * non-controllable regulators, as well as for allowing testing on
15 * systems with no controllable regulators.
16 */
17
18#include <linux/err.h>
19#include <linux/mutex.h>
20#include <linux/platform_device.h>
21#include <linux/regulator/driver.h>
22#include <linux/regulator/fixed.h>
23
24struct fixed_voltage_data {
25 struct regulator_desc desc;
26 struct regulator_dev *dev;
27 int microvolts;
28};
29
30static int fixed_voltage_is_enabled(struct regulator_dev *dev)
31{
32 return 1;
33}
34
35static int fixed_voltage_enable(struct regulator_dev *dev)
36{
37 return 0;
38}
39
40static int fixed_voltage_get_voltage(struct regulator_dev *dev)
41{
42 struct fixed_voltage_data *data = rdev_get_drvdata(dev);
43
44 return data->microvolts;
45}
46
47static struct regulator_ops fixed_voltage_ops = {
48 .is_enabled = fixed_voltage_is_enabled,
49 .enable = fixed_voltage_enable,
50 .get_voltage = fixed_voltage_get_voltage,
51};
52
53static int regulator_fixed_voltage_probe(struct platform_device *pdev)
54{
55 struct fixed_voltage_config *config = pdev->dev.platform_data;
56 struct fixed_voltage_data *drvdata;
57 int ret;
58
59 drvdata = kzalloc(sizeof(struct fixed_voltage_data), GFP_KERNEL);
60 if (drvdata == NULL) {
61 ret = -ENOMEM;
62 goto err;
63 }
64
65 drvdata->desc.name = kstrdup(config->supply_name, GFP_KERNEL);
66 if (drvdata->desc.name == NULL) {
67 ret = -ENOMEM;
68 goto err;
69 }
70 drvdata->desc.type = REGULATOR_VOLTAGE;
71 drvdata->desc.owner = THIS_MODULE;
72 drvdata->desc.ops = &fixed_voltage_ops,
73
74 drvdata->microvolts = config->microvolts;
75
76 drvdata->dev = regulator_register(&drvdata->desc, drvdata);
77 if (IS_ERR(drvdata->dev)) {
78 ret = PTR_ERR(drvdata->dev);
79 goto err_name;
80 }
81
82 platform_set_drvdata(pdev, drvdata);
83
84 dev_dbg(&pdev->dev, "%s supplying %duV\n", drvdata->desc.name,
85 drvdata->microvolts);
86
87 return 0;
88
89err_name:
90 kfree(drvdata->desc.name);
91err:
92 kfree(drvdata);
93 return ret;
94}
95
96static int regulator_fixed_voltage_remove(struct platform_device *pdev)
97{
98 struct fixed_voltage_data *drvdata = platform_get_drvdata(pdev);
99
100 regulator_unregister(drvdata->dev);
101 kfree(drvdata->desc.name);
102 kfree(drvdata);
103
104 return 0;
105}
106
107static struct platform_driver regulator_fixed_voltage_driver = {
108 .probe = regulator_fixed_voltage_probe,
109 .remove = regulator_fixed_voltage_remove,
110 .driver = {
111 .name = "reg-fixed-voltage",
112 },
113};
114
115static int __init regulator_fixed_voltage_init(void)
116{
117 return platform_driver_register(®ulator_fixed_voltage_driver);
118}
119module_init(regulator_fixed_voltage_init);
120
121static void __exit regulator_fixed_voltage_exit(void)
122{
123 platform_driver_unregister(®ulator_fixed_voltage_driver);
124}
125module_exit(regulator_fixed_voltage_exit);
126
127MODULE_AUTHOR("Mark Brown <broonie@opensource.wolfsonmicro.com>");
128MODULE_DESCRIPTION("Fixed voltage regulator");
129MODULE_LICENSE("GPL");