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	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
56static struct rfkill_ops rfkill_regulator_ops = {
57	.set_block = rfkill_regulator_set_block,
58};
59
60static 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
117err_rfkill_register:
118	rfkill_destroy(rf_kill);
119err_rfkill_alloc:
120	kfree(rfkill_data);
121err_data_alloc:
122	regulator_put(vcc);
123out:
124	return ret;
125}
126
127static 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
140static 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
148module_platform_driver(rfkill_regulator_driver);
149
150MODULE_AUTHOR("Guiming Zhuo <gmzhuo@gmail.com>");
151MODULE_AUTHOR("Antonio Ospite <ospite@studenti.unina.it>");
152MODULE_DESCRIPTION("Regulator consumer driver for rfkill");
153MODULE_LICENSE("GPL");
154MODULE_ALIAS("platform:rfkill-regulator");
155