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linux
1/*
2 * rfkill-regulator.c - Regulator consumer driver for rfkill
3 *
4 * Copyright (C) 2009 Guiming Zhuo <gmzhuo@gmail.com>
5 * Copyright (C) 2011 Antonio Ospite <ospite@studenti.unina.it>
6 *
7 * Implementation inspired by leds-regulator driver.
8 *
9 * This program is free software; you can redistribute it and/or modify
10 * it under the terms of the GNU General Public License version 2 as
11 * published by the Free Software Foundation.
12 *
13 */
14
15#include <linux/module.h>
16#include <linux/err.h>
17#include <linux/slab.h>
18#include <linux/platform_device.h>
19#include <linux/regulator/consumer.h>
20#include <linux/rfkill.h>
21#include <linux/rfkill-regulator.h>
22
23struct rfkill_regulator_data {
24 struct rfkill *rf_kill;
25 bool reg_enabled;
26
27 struct regulator *vcc;
28};
29
30static int rfkill_regulator_set_block(void *data, bool blocked)
31{
32 struct rfkill_regulator_data *rfkill_data = data;
33
34 pr_debug("%s: blocked: %d\n", __func__, blocked);
35
36 if (blocked) {
37 if (rfkill_data->reg_enabled) {
38 regulator_disable(rfkill_data->vcc);
39 rfkill_data->reg_enabled = 0;
40 }
41 } else {
42 if (!rfkill_data->reg_enabled) {
43 regulator_enable(rfkill_data->vcc);
44 rfkill_data->reg_enabled = 1;
45 }
46 }
47
48 pr_debug("%s: regulator_is_enabled after set_block: %d\n", __func__,
49 regulator_is_enabled(rfkill_data->vcc));
50
51 return 0;
52}
53
54struct rfkill_ops rfkill_regulator_ops = {
55 .set_block = rfkill_regulator_set_block,
56};
57
58static int __devinit rfkill_regulator_probe(struct platform_device *pdev)
59{
60 struct rfkill_regulator_platform_data *pdata = pdev->dev.platform_data;
61 struct rfkill_regulator_data *rfkill_data;
62 struct regulator *vcc;
63 struct rfkill *rf_kill;
64 int ret = 0;
65
66 if (pdata == NULL) {
67 dev_err(&pdev->dev, "no platform data\n");
68 return -ENODEV;
69 }
70
71 if (pdata->name == NULL || pdata->type == 0) {
72 dev_err(&pdev->dev, "invalid name or type in platform data\n");
73 return -EINVAL;
74 }
75
76 vcc = regulator_get_exclusive(&pdev->dev, "vrfkill");
77 if (IS_ERR(vcc)) {
78 dev_err(&pdev->dev, "Cannot get vcc for %s\n", pdata->name);
79 ret = PTR_ERR(vcc);
80 goto out;
81 }
82
83 rfkill_data = kzalloc(sizeof(*rfkill_data), GFP_KERNEL);
84 if (rfkill_data == NULL) {
85 ret = -ENOMEM;
86 goto err_data_alloc;
87 }
88
89 rf_kill = rfkill_alloc(pdata->name, &pdev->dev,
90 pdata->type,
91 &rfkill_regulator_ops, rfkill_data);
92 if (rf_kill == NULL) {
93 ret = -ENOMEM;
94 goto err_rfkill_alloc;
95 }
96
97 if (regulator_is_enabled(vcc)) {
98 dev_dbg(&pdev->dev, "Regulator already enabled\n");
99 rfkill_data->reg_enabled = 1;
100 }
101 rfkill_data->vcc = vcc;
102 rfkill_data->rf_kill = rf_kill;
103
104 ret = rfkill_register(rf_kill);
105 if (ret) {
106 dev_err(&pdev->dev, "Cannot register rfkill device\n");
107 goto err_rfkill_register;
108 }
109
110 platform_set_drvdata(pdev, rfkill_data);
111 dev_info(&pdev->dev, "%s initialized\n", pdata->name);
112
113 return 0;
114
115err_rfkill_register:
116 rfkill_destroy(rf_kill);
117err_rfkill_alloc:
118 kfree(rfkill_data);
119err_data_alloc:
120 regulator_put(vcc);
121out:
122 return ret;
123}
124
125static int __devexit rfkill_regulator_remove(struct platform_device *pdev)
126{
127 struct rfkill_regulator_data *rfkill_data = platform_get_drvdata(pdev);
128 struct rfkill *rf_kill = rfkill_data->rf_kill;
129
130 rfkill_unregister(rf_kill);
131 rfkill_destroy(rf_kill);
132 regulator_put(rfkill_data->vcc);
133 kfree(rfkill_data);
134
135 return 0;
136}
137
138static struct platform_driver rfkill_regulator_driver = {
139 .probe = rfkill_regulator_probe,
140 .remove = __devexit_p(rfkill_regulator_remove),
141 .driver = {
142 .name = "rfkill-regulator",
143 .owner = THIS_MODULE,
144 },
145};
146
147static int __init rfkill_regulator_init(void)
148{
149 return platform_driver_register(&rfkill_regulator_driver);
150}
151module_init(rfkill_regulator_init);
152
153static void __exit rfkill_regulator_exit(void)
154{
155 platform_driver_unregister(&rfkill_regulator_driver);
156}
157module_exit(rfkill_regulator_exit);
158
159MODULE_AUTHOR("Guiming Zhuo <gmzhuo@gmail.com>");
160MODULE_AUTHOR("Antonio Ospite <ospite@studenti.unina.it>");
161MODULE_DESCRIPTION("Regulator consumer driver for rfkill");
162MODULE_LICENSE("GPL");
163MODULE_ALIAS("platform:rfkill-regulator");