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 = 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
 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 = 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
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
147module_platform_driver(rfkill_regulator_driver);
148
149MODULE_AUTHOR("Guiming Zhuo <gmzhuo@gmail.com>");
150MODULE_AUTHOR("Antonio Ospite <ospite@studenti.unina.it>");
151MODULE_DESCRIPTION("Regulator consumer driver for rfkill");
152MODULE_LICENSE("GPL");
153MODULE_ALIAS("platform:rfkill-regulator");