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
23 struct rfkill_regulator_data {
24 struct rfkill *rf_kill;
25 bool reg_enabled;
26
27 struct regulator *vcc;
28 };
29
rfkill_regulator_set_block(void * data,bool blocked)30 static int rfkill_regulator_set_block(void *data, bool blocked)
31 {
32 struct rfkill_regulator_data *rfkill_data = data;
33 int ret = 0;
34
35 pr_debug("%s: blocked: %d\n", __func__, blocked);
36
37 if (blocked) {
38 if (rfkill_data->reg_enabled) {
39 regulator_disable(rfkill_data->vcc);
40 rfkill_data->reg_enabled = false;
41 }
42 } else {
43 if (!rfkill_data->reg_enabled) {
44 ret = regulator_enable(rfkill_data->vcc);
45 if (!ret)
46 rfkill_data->reg_enabled = true;
47 }
48 }
49
50 pr_debug("%s: regulator_is_enabled after set_block: %d\n", __func__,
51 regulator_is_enabled(rfkill_data->vcc));
52
53 return ret;
54 }
55
56 static struct rfkill_ops rfkill_regulator_ops = {
57 .set_block = rfkill_regulator_set_block,
58 };
59
rfkill_regulator_probe(struct platform_device * pdev)60 static int rfkill_regulator_probe(struct platform_device *pdev)
61 {
62 struct rfkill_regulator_platform_data *pdata = pdev->dev.platform_data;
63 struct rfkill_regulator_data *rfkill_data;
64 struct regulator *vcc;
65 struct rfkill *rf_kill;
66 int ret = 0;
67
68 if (pdata == NULL) {
69 dev_err(&pdev->dev, "no platform data\n");
70 return -ENODEV;
71 }
72
73 if (pdata->name == NULL || pdata->type == 0) {
74 dev_err(&pdev->dev, "invalid name or type in platform data\n");
75 return -EINVAL;
76 }
77
78 vcc = regulator_get_exclusive(&pdev->dev, "vrfkill");
79 if (IS_ERR(vcc)) {
80 dev_err(&pdev->dev, "Cannot get vcc for %s\n", pdata->name);
81 ret = PTR_ERR(vcc);
82 goto out;
83 }
84
85 rfkill_data = kzalloc(sizeof(*rfkill_data), GFP_KERNEL);
86 if (rfkill_data == NULL) {
87 ret = -ENOMEM;
88 goto err_data_alloc;
89 }
90
91 rf_kill = rfkill_alloc(pdata->name, &pdev->dev,
92 pdata->type,
93 &rfkill_regulator_ops, rfkill_data);
94 if (rf_kill == NULL) {
95 ret = -ENOMEM;
96 goto err_rfkill_alloc;
97 }
98
99 if (regulator_is_enabled(vcc)) {
100 dev_dbg(&pdev->dev, "Regulator already enabled\n");
101 rfkill_data->reg_enabled = true;
102 }
103 rfkill_data->vcc = vcc;
104 rfkill_data->rf_kill = rf_kill;
105
106 ret = rfkill_register(rf_kill);
107 if (ret) {
108 dev_err(&pdev->dev, "Cannot register rfkill device\n");
109 goto err_rfkill_register;
110 }
111
112 platform_set_drvdata(pdev, rfkill_data);
113 dev_info(&pdev->dev, "%s initialized\n", pdata->name);
114
115 return 0;
116
117 err_rfkill_register:
118 rfkill_destroy(rf_kill);
119 err_rfkill_alloc:
120 kfree(rfkill_data);
121 err_data_alloc:
122 regulator_put(vcc);
123 out:
124 return ret;
125 }
126
rfkill_regulator_remove(struct platform_device * pdev)127 static int rfkill_regulator_remove(struct platform_device *pdev)
128 {
129 struct rfkill_regulator_data *rfkill_data = platform_get_drvdata(pdev);
130 struct rfkill *rf_kill = rfkill_data->rf_kill;
131
132 rfkill_unregister(rf_kill);
133 rfkill_destroy(rf_kill);
134 regulator_put(rfkill_data->vcc);
135 kfree(rfkill_data);
136
137 return 0;
138 }
139
140 static struct platform_driver rfkill_regulator_driver = {
141 .probe = rfkill_regulator_probe,
142 .remove = rfkill_regulator_remove,
143 .driver = {
144 .name = "rfkill-regulator",
145 },
146 };
147
148 module_platform_driver(rfkill_regulator_driver);
149
150 MODULE_AUTHOR("Guiming Zhuo <gmzhuo@gmail.com>");
151 MODULE_AUTHOR("Antonio Ospite <ospite@studenti.unina.it>");
152 MODULE_DESCRIPTION("Regulator consumer driver for rfkill");
153 MODULE_LICENSE("GPL");
154 MODULE_ALIAS("platform:rfkill-regulator");
155