[deliverable/linux.git] / net / rfkill / rfkill-gpio.c

/*
 * Copyright (c) 2011, NVIDIA Corporation.
 *
 * This program is free software; you can redistribute it and/or modify
 * it under the terms of the GNU General Public License as published by
 * the Free Software Foundation; either version 2 of the License, or
 * (at your option) any later version.
 *
 * This program is distributed in the hope that it will be useful, but WITHOUT
 * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
 * FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License for
 * more details.
 *
 * You should have received a copy of the GNU General Public License along
 * with this program; if not, write to the Free Software Foundation, Inc.,
 * 51 Franklin Street, Fifth Floor, Boston, MA  02110-1301, USA.
 */

#include <linux/gpio.h>
#include <linux/init.h>
#include <linux/kernel.h>
#include <linux/module.h>
#include <linux/rfkill.h>
#include <linux/platform_device.h>
#include <linux/clk.h>
#include <linux/slab.h>
#include <linux/acpi.h>
#include <linux/gpio/consumer.h>

#include <linux/rfkill-gpio.h>

struct rfkill_gpio_data {
	const char		*name;
	enum rfkill_type	type;
	struct gpio_desc	*reset_gpio;
	struct gpio_desc	*shutdown_gpio;

	struct rfkill		*rfkill_dev;
	struct clk		*clk;

	bool			clk_enabled;
};

static int rfkill_gpio_set_power(void *data, bool blocked)
{
	struct rfkill_gpio_data *rfkill = data;

	if (!blocked && !IS_ERR(rfkill->clk) && !rfkill->clk_enabled)
		clk_enable(rfkill->clk);

	gpiod_set_value_cansleep(rfkill->shutdown_gpio, !blocked);
	gpiod_set_value_cansleep(rfkill->reset_gpio, !blocked);

	if (blocked && !IS_ERR(rfkill->clk) && rfkill->clk_enabled)
		clk_disable(rfkill->clk);

	rfkill->clk_enabled = !blocked;

	return 0;
}

static const struct rfkill_ops rfkill_gpio_ops = {
	.set_block = rfkill_gpio_set_power,
};

static int rfkill_gpio_acpi_probe(struct device *dev,
				  struct rfkill_gpio_data *rfkill)
{
	const struct acpi_device_id *id;

	id = acpi_match_device(dev->driver->acpi_match_table, dev);
	if (!id)
		return -ENODEV;

	rfkill->name = dev_name(dev);
	rfkill->type = (unsigned)id->driver_data;

	return 0;
}

static int rfkill_gpio_probe(struct platform_device *pdev)
{
	struct rfkill_gpio_platform_data *pdata = pdev->dev.platform_data;
	struct rfkill_gpio_data *rfkill;
	struct gpio_desc *gpio;
	int ret;

	rfkill = devm_kzalloc(&pdev->dev, sizeof(*rfkill), GFP_KERNEL);
	if (!rfkill)
		return -ENOMEM;

	if (ACPI_HANDLE(&pdev->dev)) {
		ret = rfkill_gpio_acpi_probe(&pdev->dev, rfkill);
		if (ret)
			return ret;
	} else if (pdata) {
		rfkill->name = pdata->name;
		rfkill->type = pdata->type;
	} else {
		return -ENODEV;
	}

	rfkill->clk = devm_clk_get(&pdev->dev, NULL);

	gpio = devm_gpiod_get_index(&pdev->dev, "reset", 0);
	if (!IS_ERR(gpio)) {
		ret = gpiod_direction_output(gpio, 0);
		if (ret)
			return ret;
		rfkill->reset_gpio = gpio;
	}

	gpio = devm_gpiod_get_index(&pdev->dev, "shutdown", 1);
	if (!IS_ERR(gpio)) {
		ret = gpiod_direction_output(gpio, 0);
		if (ret)
			return ret;
		rfkill->shutdown_gpio = gpio;
	}

	/* Make sure at-least one of the GPIO is defined and that
	 * a name is specified for this instance
	 */
	if ((!rfkill->reset_gpio && !rfkill->shutdown_gpio) || !rfkill->name) {
		dev_err(&pdev->dev, "invalid platform data\n");
		return -EINVAL;
	}

	rfkill->rfkill_dev = rfkill_alloc(rfkill->name, &pdev->dev,
					  rfkill->type, &rfkill_gpio_ops,
					  rfkill);
	if (!rfkill->rfkill_dev)
		return -ENOMEM;

	ret = rfkill_register(rfkill->rfkill_dev);
	if (ret < 0)
		return ret;

	platform_set_drvdata(pdev, rfkill);

	dev_info(&pdev->dev, "%s device registered.\n", rfkill->name);

	return 0;
}

static int rfkill_gpio_remove(struct platform_device *pdev)
{
	struct rfkill_gpio_data *rfkill = platform_get_drvdata(pdev);

	rfkill_unregister(rfkill->rfkill_dev);
	rfkill_destroy(rfkill->rfkill_dev);

	return 0;
}

#ifdef CONFIG_ACPI
static const struct acpi_device_id rfkill_acpi_match[] = {
	{ "BCM2E1A", RFKILL_TYPE_BLUETOOTH },
	{ "BCM2E39", RFKILL_TYPE_BLUETOOTH },
	{ "BCM2E3D", RFKILL_TYPE_BLUETOOTH },
	{ "BCM2E64", RFKILL_TYPE_BLUETOOTH },
	{ "BCM4752", RFKILL_TYPE_GPS },
	{ "LNV4752", RFKILL_TYPE_GPS },
	{ },
};
MODULE_DEVICE_TABLE(acpi, rfkill_acpi_match);
#endif

static struct platform_driver rfkill_gpio_driver = {
	.probe = rfkill_gpio_probe,
	.remove = rfkill_gpio_remove,
	.driver = {
		.name = "rfkill_gpio",
		.owner = THIS_MODULE,
		.acpi_match_table = ACPI_PTR(rfkill_acpi_match),
	},
};

module_platform_driver(rfkill_gpio_driver);

MODULE_DESCRIPTION("gpio rfkill");
MODULE_AUTHOR("NVIDIA");
MODULE_LICENSE("GPL");
Commit	Line	Data
7176ba23 RK	1	/*
	2	* Copyright (c) 2011, NVIDIA Corporation.
	3	*
	4	* This program is free software; you can redistribute it and/or modify
	5	* it under the terms of the GNU General Public License as published by
	6	* the Free Software Foundation; either version 2 of the License, or
	7	* (at your option) any later version.
	8	*
	9	* This program is distributed in the hope that it will be useful, but WITHOUT
	10	* ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
	11	* FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License for
	12	* more details.
	13	*
	14	* You should have received a copy of the GNU General Public License along
	15	* with this program; if not, write to the Free Software Foundation, Inc.,
	16	* 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301, USA.
	17	*/
	18
	19	#include <linux/gpio.h>
	20	#include <linux/init.h>
	21	#include <linux/kernel.h>
	22	#include <linux/module.h>
	23	#include <linux/rfkill.h>
	24	#include <linux/platform_device.h>
	25	#include <linux/clk.h>
	26	#include <linux/slab.h>
ef91ffaa	27	#include <linux/acpi.h>
2111cad6	28	#include <linux/gpio/consumer.h>
7176ba23 RK	29
	30	#include <linux/rfkill-gpio.h>
	31
7176ba23	32	struct rfkill_gpio_data {
262c91ee HK	33	const char *name;
262c91ee HK	34	enum rfkill_type type;
2111cad6 HK	35	struct gpio_desc *reset_gpio;
2111cad6 HK	36	struct gpio_desc *shutdown_gpio;
262c91ee HK	37
262c91ee HK	38	struct rfkill *rfkill_dev;
262c91ee HK	39	struct clk *clk;
	40
	41	bool clk_enabled;
7176ba23 RK	42	};
	43
	44	static int rfkill_gpio_set_power(void *data, bool blocked)
	45	{
	46	struct rfkill_gpio_data *rfkill = data;
	47
771bb3dd LP	48	if (!blocked && !IS_ERR(rfkill->clk) && !rfkill->clk_enabled)
	49	clk_enable(rfkill->clk);
	50
	51	gpiod_set_value_cansleep(rfkill->shutdown_gpio, !blocked);
	52	gpiod_set_value_cansleep(rfkill->reset_gpio, !blocked);
	53
	54	if (blocked && !IS_ERR(rfkill->clk) && rfkill->clk_enabled)
	55	clk_disable(rfkill->clk);
7176ba23	56
fa5c107c	57	rfkill->clk_enabled = !blocked;
7176ba23 RK	58
	59	return 0;
	60	}
	61
	62	static const struct rfkill_ops rfkill_gpio_ops = {
	63	.set_block = rfkill_gpio_set_power,
	64	};
	65
ef91ffaa HK	66	static int rfkill_gpio_acpi_probe(struct device *dev,
	67	struct rfkill_gpio_data *rfkill)
	68	{
	69	const struct acpi_device_id *id;
	70
	71	id = acpi_match_device(dev->driver->acpi_match_table, dev);
	72	if (!id)
	73	return -ENODEV;
	74
	75	rfkill->name = dev_name(dev);
	76	rfkill->type = (unsigned)id->driver_data;
ef91ffaa HK	77
	78	return 0;
	79	}
	80
7176ba23 RK	81	static int rfkill_gpio_probe(struct platform_device *pdev)
7176ba23 RK	82	{
7176ba23	83	struct rfkill_gpio_platform_data *pdata = pdev->dev.platform_data;
262c91ee	84	struct rfkill_gpio_data *rfkill;
2111cad6 HK	85	struct gpio_desc *gpio;
2111cad6 HK	86	int ret;
7176ba23	87
262c91ee HK	88	rfkill = devm_kzalloc(&pdev->dev, sizeof(*rfkill), GFP_KERNEL);
	89	if (!rfkill)
	90	return -ENOMEM;
	91
ef91ffaa HK	92	if (ACPI_HANDLE(&pdev->dev)) {
	93	ret = rfkill_gpio_acpi_probe(&pdev->dev, rfkill);
	94	if (ret)
	95	return ret;
	96	} else if (pdata) {
262c91ee HK	97	rfkill->name = pdata->name;
262c91ee HK	98	rfkill->type = pdata->type;
262c91ee HK	99	} else {
262c91ee HK	100	return -ENODEV;
7176ba23 RK	101	}
7176ba23 RK	102
848ef586	103	rfkill->clk = devm_clk_get(&pdev->dev, NULL);
7176ba23	104
781d4e0f	105	gpio = devm_gpiod_get_index(&pdev->dev, "reset", 0);
2111cad6 HK	106	if (!IS_ERR(gpio)) {
	107	ret = gpiod_direction_output(gpio, 0);
	108	if (ret)
5e7ca393	109	return ret;
2111cad6 HK	110	rfkill->reset_gpio = gpio;
	111	}
	112
781d4e0f	113	gpio = devm_gpiod_get_index(&pdev->dev, "shutdown", 1);
2111cad6 HK	114	if (!IS_ERR(gpio)) {
	115	ret = gpiod_direction_output(gpio, 0);
	116	if (ret)
	117	return ret;
	118	rfkill->shutdown_gpio = gpio;
7176ba23 RK	119	}
7176ba23 RK	120
2111cad6 HK	121	/* Make sure at-least one of the GPIO is defined and that
	122	* a name is specified for this instance
	123	*/
	124	if ((!rfkill->reset_gpio && !rfkill->shutdown_gpio) \|\| !rfkill->name) {
	125	dev_err(&pdev->dev, "invalid platform data\n");
	126	return -EINVAL;
	127	}
	128
262c91ee HK	129	rfkill->rfkill_dev = rfkill_alloc(rfkill->name, &pdev->dev,
	130	rfkill->type, &rfkill_gpio_ops,
	131	rfkill);
5e7ca393 HK	132	if (!rfkill->rfkill_dev)
5e7ca393 HK	133	return -ENOMEM;
7176ba23 RK	134
	135	ret = rfkill_register(rfkill->rfkill_dev);
	136	if (ret < 0)
5e7ca393	137	return ret;
7176ba23 RK	138
	139	platform_set_drvdata(pdev, rfkill);
	140
262c91ee	141	dev_info(&pdev->dev, "%s device registered.\n", rfkill->name);
7176ba23 RK	142
7176ba23 RK	143	return 0;
7176ba23 RK	144	}
	145
	146	static int rfkill_gpio_remove(struct platform_device *pdev)
	147	{
	148	struct rfkill_gpio_data *rfkill = platform_get_drvdata(pdev);
	149
	150	rfkill_unregister(rfkill->rfkill_dev);
	151	rfkill_destroy(rfkill->rfkill_dev);
7176ba23 RK	152
	153	return 0;
	154	}
	155
41d09df1	156	#ifdef CONFIG_ACPI
ef91ffaa	157	static const struct acpi_device_id rfkill_acpi_match[] = {
41d09df1 HK	158	{ "BCM2E1A", RFKILL_TYPE_BLUETOOTH },
	159	{ "BCM2E39", RFKILL_TYPE_BLUETOOTH },
	160	{ "BCM2E3D", RFKILL_TYPE_BLUETOOTH },
fb70118c	161	{ "BCM2E64", RFKILL_TYPE_BLUETOOTH },
ef91ffaa	162	{ "BCM4752", RFKILL_TYPE_GPS },
04f1b47c	163	{ "LNV4752", RFKILL_TYPE_GPS },
ef91ffaa HK	164	{ },
ef91ffaa HK	165	};
dda3b191	166	MODULE_DEVICE_TABLE(acpi, rfkill_acpi_match);
41d09df1	167	#endif
ef91ffaa	168
7176ba23 RK	169	static struct platform_driver rfkill_gpio_driver = {
7176ba23 RK	170	.probe = rfkill_gpio_probe,
9e2b29d0	171	.remove = rfkill_gpio_remove,
7176ba23	172	.driver = {
262c91ee HK	173	.name = "rfkill_gpio",
262c91ee HK	174	.owner = THIS_MODULE,
ef91ffaa	175	.acpi_match_table = ACPI_PTR(rfkill_acpi_match),
7176ba23 RK	176	},
	177	};
	178
98ef55f6	179	module_platform_driver(rfkill_gpio_driver);
7176ba23 RK	180
	181	MODULE_DESCRIPTION("gpio rfkill");
	182	MODULE_AUTHOR("NVIDIA");
	183	MODULE_LICENSE("GPL");