aboutsummaryrefslogtreecommitdiff
path: root/net/rfkill/rfkill-regulator.c
blob: 3ca7277a3c362db9b4f1499cf00fcc3897839393 (plain)
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
/*
 * rfkill-regulator.c - Regulator consumer driver for rfkill
 *
 * Copyright (C) 2009  Guiming Zhuo <gmzhuo@gmail.com>
 * Copyright (C) 2011  Antonio Ospite <ospite@studenti.unina.it>
 *
 * Implementation inspired by leds-regulator driver.
 *
 * This program is free software; you can redistribute it and/or modify
 * it under the terms of the GNU General Public License version 2 as
 * published by the Free Software Foundation.
 *
 */

#include <linux/module.h>
#include <linux/err.h>
#include <linux/slab.h>
#include <linux/platform_device.h>
#include <linux/regulator/consumer.h>
#include <linux/rfkill.h>
#include <linux/rfkill-regulator.h>

struct rfkill_regulator_data {
	struct rfkill *rf_kill;
	bool reg_enabled;

	struct regulator *vcc;
};

static int rfkill_regulator_set_block(void *data, bool blocked)
{
	struct rfkill_regulator_data *rfkill_data = data;

	pr_debug("%s: blocked: %d\n", __func__, blocked);

	if (blocked) {
		if (rfkill_data->reg_enabled) {
			regulator_disable(rfkill_data->vcc);
			rfkill_data->reg_enabled = 0;
		}
	} else {
		if (!rfkill_data->reg_enabled) {
			regulator_enable(rfkill_data->vcc);
			rfkill_data->reg_enabled = 1;
		}
	}

	pr_debug("%s: regulator_is_enabled after set_block: %d\n", __func__,
		regulator_is_enabled(rfkill_data->vcc));

	return 0;
}

struct rfkill_ops rfkill_regulator_ops = {
	.set_block = rfkill_regulator_set_block,
};

static int __devinit rfkill_regulator_probe(struct platform_device *pdev)
{
	struct rfkill_regulator_platform_data *pdata = pdev->dev.platform_data;
	struct rfkill_regulator_data *rfkill_data;
	struct regulator *vcc;
	struct rfkill *rf_kill;
	int ret = 0;

	if (pdata == NULL) {
		dev_err(&pdev->dev, "no platform data\n");
		return -ENODEV;
	}

	if (pdata->name == NULL || pdata->type == 0) {
		dev_err(&pdev->dev, "invalid name or type in platform data\n");
		return -EINVAL;
	}

	vcc = regulator_get_exclusive(&pdev->dev, "vrfkill");
	if (IS_ERR(vcc)) {
		dev_err(&pdev->dev, "Cannot get vcc for %s\n", pdata->name);
		ret = PTR_ERR(vcc);
		goto out;
	}

	rfkill_data = kzalloc(sizeof(*rfkill_data), GFP_KERNEL);
	if (rfkill_data == NULL) {
		ret = -ENOMEM;
		goto err_data_alloc;
	}

	rf_kill = rfkill_alloc(pdata->name, &pdev->dev,
				pdata->type,
				&rfkill_regulator_ops, rfkill_data);
	if (rf_kill == NULL) {
		ret = -ENOMEM;
		goto err_rfkill_alloc;
	}

	if (regulator_is_enabled(vcc)) {
		dev_dbg(&pdev->dev, "Regulator already enabled\n");
		rfkill_data->reg_enabled = 1;
	}
	rfkill_data->vcc = vcc;
	rfkill_data->rf_kill = rf_kill;

	ret = rfkill_register(rf_kill);
	if (ret) {
		dev_err(&pdev->dev, "Cannot register rfkill device\n");
		goto err_rfkill_register;
	}

	platform_set_drvdata(pdev, rfkill_data);
	dev_info(&pdev->dev, "%s initialized\n", pdata->name);

	return 0;

err_rfkill_register:
	rfkill_destroy(rf_kill);
err_rfkill_alloc:
	kfree(rfkill_data);
err_data_alloc:
	regulator_put(vcc);
out:
	return ret;
}

static int __devexit rfkill_regulator_remove(struct platform_device *pdev)
{
	struct rfkill_regulator_data *rfkill_data = platform_get_drvdata(pdev);
	struct rfkill *rf_kill = rfkill_data->rf_kill;

	rfkill_unregister(rf_kill);
	rfkill_destroy(rf_kill);
	regulator_put(rfkill_data->vcc);
	kfree(rfkill_data);

	return 0;
}

static struct platform_driver rfkill_regulator_driver = {
	.probe = rfkill_regulator_probe,
	.remove = __devexit_p(rfkill_regulator_remove),
	.driver = {
		.name = "rfkill-regulator",
		.owner = THIS_MODULE,
	},
};

static int __init rfkill_regulator_init(void)
{
	return platform_driver_register(&rfkill_regulator_driver);
}
module_init(rfkill_regulator_init);

static void __exit rfkill_regulator_exit(void)
{
	platform_driver_unregister(&rfkill_regulator_driver);
}
module_exit(rfkill_regulator_exit);

MODULE_AUTHOR("Guiming Zhuo <gmzhuo@gmail.com>");
MODULE_AUTHOR("Antonio Ospite <ospite@studenti.unina.it>");
MODULE_DESCRIPTION("Regulator consumer driver for rfkill");
MODULE_LICENSE("GPL");
MODULE_ALIAS("platform:rfkill-regulator");