[mirror_ubuntu-artful-kernel.git] / drivers / gpio / gpio-max7300.c

/*
 * Copyright (C) 2009 Wolfram Sang, Pengutronix
 *
 * 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.
 *
 * Check max730x.c for further details.
 */

#include <linux/module.h>
#include <linux/init.h>
#include <linux/platform_device.h>
#include <linux/mutex.h>
#include <linux/i2c.h>
#include <linux/spi/max7301.h>
#include <linux/slab.h>

static int max7300_i2c_write(struct device *dev, unsigned int reg,
				unsigned int val)
{
	struct i2c_client *client = to_i2c_client(dev);

	return i2c_smbus_write_byte_data(client, reg, val);
}

static int max7300_i2c_read(struct device *dev, unsigned int reg)
{
	struct i2c_client *client = to_i2c_client(dev);

	return i2c_smbus_read_byte_data(client, reg);
}

static int max7300_probe(struct i2c_client *client,
			 const struct i2c_device_id *id)
{
	struct max7301 *ts;

	if (!i2c_check_functionality(client->adapter,
			I2C_FUNC_SMBUS_BYTE_DATA))
		return -EIO;

	ts = devm_kzalloc(&client->dev, sizeof(struct max7301), GFP_KERNEL);
	if (!ts)
		return -ENOMEM;

	ts->read = max7300_i2c_read;
	ts->write = max7300_i2c_write;
	ts->dev = &client->dev;

	return __max730x_probe(ts);
}

static int max7300_remove(struct i2c_client *client)
{
	return __max730x_remove(&client->dev);
}

static const struct i2c_device_id max7300_id[] = {
	{ "max7300", 0 },
	{ }
};
MODULE_DEVICE_TABLE(i2c, max7300_id);

static struct i2c_driver max7300_driver = {
	.driver = {
		.name = "max7300",
	},
	.probe = max7300_probe,
	.remove = max7300_remove,
	.id_table = max7300_id,
};

static int __init max7300_init(void)
{
	return i2c_add_driver(&max7300_driver);
}
subsys_initcall(max7300_init);

static void __exit max7300_exit(void)
{
	i2c_del_driver(&max7300_driver);
}
module_exit(max7300_exit);

MODULE_AUTHOR("Wolfram Sang");
MODULE_LICENSE("GPL v2");
MODULE_DESCRIPTION("MAX7300 GPIO-Expander");
Commit	Line	Data
e952805d	1	/*
e952805d WS	2	* Copyright (C) 2009 Wolfram Sang, Pengutronix
	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 version 2 as
	6	* published by the Free Software Foundation.
	7	*
	8	* Check max730x.c for further details.
	9	*/
	10
	11	#include <linux/module.h>
	12	#include <linux/init.h>
	13	#include <linux/platform_device.h>
	14	#include <linux/mutex.h>
	15	#include <linux/i2c.h>
	16	#include <linux/spi/max7301.h>
5a0e3ad6	17	#include <linux/slab.h>
e952805d WS	18
	19	static int max7300_i2c_write(struct device *dev, unsigned int reg,
	20	unsigned int val)
	21	{
	22	struct i2c_client *client = to_i2c_client(dev);
	23
	24	return i2c_smbus_write_byte_data(client, reg, val);
	25	}
	26
	27	static int max7300_i2c_read(struct device *dev, unsigned int reg)
	28	{
	29	struct i2c_client *client = to_i2c_client(dev);
	30
	31	return i2c_smbus_read_byte_data(client, reg);
	32	}
	33
3836309d	34	static int max7300_probe(struct i2c_client *client,
e952805d WS	35	const struct i2c_device_id *id)
	36	{
	37	struct max7301 *ts;
e952805d WS	38
	39	if (!i2c_check_functionality(client->adapter,
	40	I2C_FUNC_SMBUS_BYTE_DATA))
	41	return -EIO;
	42
c3fe2bf4	43	ts = devm_kzalloc(&client->dev, sizeof(struct max7301), GFP_KERNEL);
e952805d WS	44	if (!ts)
	45	return -ENOMEM;
	46
	47	ts->read = max7300_i2c_read;
	48	ts->write = max7300_i2c_write;
	49	ts->dev = &client->dev;
	50
76a2dae0	51	return __max730x_probe(ts);
e952805d WS	52	}
e952805d WS	53
206210ce	54	static int max7300_remove(struct i2c_client *client)
e952805d WS	55	{
	56	return __max730x_remove(&client->dev);
	57	}
	58
	59	static const struct i2c_device_id max7300_id[] = {
	60	{ "max7300", 0 },
	61	{ }
	62	};
	63	MODULE_DEVICE_TABLE(i2c, max7300_id);
	64
	65	static struct i2c_driver max7300_driver = {
	66	.driver = {
	67	.name = "max7300",
e952805d WS	68	},
e952805d WS	69	.probe = max7300_probe,
8283c4ff	70	.remove = max7300_remove,
e952805d WS	71	.id_table = max7300_id,
	72	};
	73
	74	static int __init max7300_init(void)
	75	{
	76	return i2c_add_driver(&max7300_driver);
	77	}
	78	subsys_initcall(max7300_init);
	79
	80	static void __exit max7300_exit(void)
	81	{
	82	i2c_del_driver(&max7300_driver);
	83	}
	84	module_exit(max7300_exit);
	85
	86	MODULE_AUTHOR("Wolfram Sang");
	87	MODULE_LICENSE("GPL v2");
	88	MODULE_DESCRIPTION("MAX7300 GPIO-Expander");