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
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 = false;
40 }
41 } else {
42 if (!rfkill_data->reg_enabled) {
43 regulator_enable(rfkill_data->vcc);
44 rfkill_data->reg_enabled = true;
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
54 struct rfkill_ops rfkill_regulator_ops = {
55 .set_block = rfkill_regulator_set_block,
56 };
57
rfkill_regulator_probe(struct platform_device * pdev)58 static 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 = true;
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
115 err_rfkill_register:
116 rfkill_destroy(rf_kill);
117 err_rfkill_alloc:
118 kfree(rfkill_data);
119 err_data_alloc:
120 regulator_put(vcc);
121 out:
122 return ret;
123 }
124
rfkill_regulator_remove(struct platform_device * pdev)125 static 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
138 static 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
147 module_platform_driver(rfkill_regulator_driver);
148
149 MODULE_AUTHOR("Guiming Zhuo <gmzhuo@gmail.com>");
150 MODULE_AUTHOR("Antonio Ospite <ospite@studenti.unina.it>");
151 MODULE_DESCRIPTION("Regulator consumer driver for rfkill");
152 MODULE_LICENSE("GPL");
153 MODULE_ALIAS("platform:rfkill-regulator");
154