[deliverable/linux.git] / drivers / mfd / wm8350-i2c.c

/*
 * wm8350-i2c.c  --  Generic I2C driver for Wolfson WM8350 PMIC
 *
 * This driver defines and configures the WM8350 for the Freescale i.MX32ADS.
 *
 * Copyright 2007, 2008 Wolfson Microelectronics PLC.
 *
 * Author: Liam Girdwood
 *         linux@wolfsonmicro.com
 *
 *  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.
 *
 */

#include <linux/module.h>
#include <linux/moduleparam.h>
#include <linux/init.h>
#include <linux/i2c.h>
#include <linux/platform_device.h>
#include <linux/mfd/wm8350/core.h>

static int wm8350_i2c_read_device(struct wm8350 *wm8350, char reg,
				  int bytes, void *dest)
{
	int ret;

	ret = i2c_master_send(wm8350->i2c_client, &reg, 1);
	if (ret < 0)
		return ret;
	return i2c_master_recv(wm8350->i2c_client, dest, bytes);
}

static int wm8350_i2c_write_device(struct wm8350 *wm8350, char reg,
				   int bytes, void *src)
{
	/* we add 1 byte for device register */
	u8 msg[(WM8350_MAX_REGISTER << 1) + 1];

	if (bytes > ((WM8350_MAX_REGISTER << 1) + 1))
		return -EINVAL;

	msg[0] = reg;
	memcpy(&msg[1], src, bytes);
	return i2c_master_send(wm8350->i2c_client, msg, bytes + 1);
}

static int wm8350_i2c_probe(struct i2c_client *i2c,
			    const struct i2c_device_id *id)
{
	struct wm8350 *wm8350;
	int ret = 0;

	wm8350 = kzalloc(sizeof(struct wm8350), GFP_KERNEL);
	if (wm8350 == NULL) {
		kfree(i2c);
		return -ENOMEM;
	}

	i2c_set_clientdata(i2c, wm8350);
	wm8350->dev = &i2c->dev;
	wm8350->i2c_client = i2c;
	wm8350->read_dev = wm8350_i2c_read_device;
	wm8350->write_dev = wm8350_i2c_write_device;

	ret = wm8350_device_init(wm8350);
	if (ret < 0)
		goto err;

	return ret;

err:
	kfree(wm8350);
	return ret;
}

static int wm8350_i2c_remove(struct i2c_client *i2c)
{
	struct wm8350 *wm8350 = i2c_get_clientdata(i2c);

	wm8350_device_exit(wm8350);
	kfree(wm8350);

	return 0;
}

static const struct i2c_device_id wm8350_i2c_id[] = {
       { "wm8350", 0 },
       { }
};
MODULE_DEVICE_TABLE(i2c, wm8350_i2c_id);


static struct i2c_driver wm8350_i2c_driver = {
	.driver = {
		   .name = "wm8350",
		   .owner = THIS_MODULE,
	},
	.probe = wm8350_i2c_probe,
	.remove = wm8350_i2c_remove,
	.id_table = wm8350_i2c_id,
};

static int __init wm8350_i2c_init(void)
{
	return i2c_add_driver(&wm8350_i2c_driver);
}
/* init early so consumer devices can complete system boot */
subsys_initcall(wm8350_i2c_init);

static void __exit wm8350_i2c_exit(void)
{
	i2c_del_driver(&wm8350_i2c_driver);
}
module_exit(wm8350_i2c_exit);

MODULE_DESCRIPTION("I2C support for the WM8350 AudioPlus PMIC");
MODULE_LICENSE("GPL");
Commit	Line	Data
c661a0b9 MB	1	/*
	2	* wm8350-i2c.c -- Generic I2C driver for Wolfson WM8350 PMIC
	3	*
	4	* This driver defines and configures the WM8350 for the Freescale i.MX32ADS.
	5	*
	6	* Copyright 2007, 2008 Wolfson Microelectronics PLC.
	7	*
	8	* Author: Liam Girdwood
	9	* linux@wolfsonmicro.com
	10	*
	11	* This program is free software; you can redistribute it and/or modify it
	12	* under the terms of the GNU General Public License as published by the
	13	* Free Software Foundation; either version 2 of the License, or (at your
	14	* option) any later version.
	15	*
	16	*/
	17
	18	#include <linux/module.h>
	19	#include <linux/moduleparam.h>
	20	#include <linux/init.h>
	21	#include <linux/i2c.h>
	22	#include <linux/platform_device.h>
	23	#include <linux/mfd/wm8350/core.h>
	24
	25	static int wm8350_i2c_read_device(struct wm8350 *wm8350, char reg,
	26	int bytes, void *dest)
	27	{
	28	int ret;
	29
	30	ret = i2c_master_send(wm8350->i2c_client, &reg, 1);
	31	if (ret < 0)
	32	return ret;
	33	return i2c_master_recv(wm8350->i2c_client, dest, bytes);
	34	}
	35
	36	static int wm8350_i2c_write_device(struct wm8350 *wm8350, char reg,
	37	int bytes, void *src)
	38	{
	39	/* we add 1 byte for device register */
	40	u8 msg[(WM8350_MAX_REGISTER << 1) + 1];
	41
	42	if (bytes > ((WM8350_MAX_REGISTER << 1) + 1))
	43	return -EINVAL;
	44
	45	msg[0] = reg;
	46	memcpy(&msg[1], src, bytes);
	47	return i2c_master_send(wm8350->i2c_client, msg, bytes + 1);
	48	}
	49
	50	static int wm8350_i2c_probe(struct i2c_client *i2c,
	51	const struct i2c_device_id *id)
	52	{
	53	struct wm8350 *wm8350;
	54	int ret = 0;
	55
	56	wm8350 = kzalloc(sizeof(struct wm8350), GFP_KERNEL);
	57	if (wm8350 == NULL) {
	58	kfree(i2c);
	59	return -ENOMEM;
	60	}
	61
	62	i2c_set_clientdata(i2c, wm8350);
	63	wm8350->dev = &i2c->dev;
	64	wm8350->i2c_client = i2c;
65	wm8350->read_dev = wm8350_i2c_read_device;
66	wm8350->write_dev = wm8350_i2c_write_device;
67
68	ret = wm8350_device_init(wm8350);
69	if (ret < 0)
70	goto err;
71
72	return ret;
73
74	err:
75	kfree(wm8350);
76	return ret;
77	}
78
79	static int wm8350_i2c_remove(struct i2c_client *i2c)
80	{
81	struct wm8350 *wm8350 = i2c_get_clientdata(i2c);
82
83	wm8350_device_exit(wm8350);
84	kfree(wm8350);
85
86	return 0;
87	}
88
89	static const struct i2c_device_id wm8350_i2c_id[] = {
90	{ "wm8350", 0 },
91	{ }
92	};
93	MODULE_DEVICE_TABLE(i2c, wm8350_i2c_id);
94
95
96	static struct i2c_driver wm8350_i2c_driver = {
97	.driver = {
98	.name = "wm8350",
99	.owner = THIS_MODULE,
100	},
101	.probe = wm8350_i2c_probe,
102	.remove = wm8350_i2c_remove,
103	.id_table = wm8350_i2c_id,
104	};
105
106	static int __init wm8350_i2c_init(void)
107	{
108	return i2c_add_driver(&wm8350_i2c_driver);
109	}
110	/* init early so consumer devices can complete system boot */
111	subsys_initcall(wm8350_i2c_init);
112
113	static void __exit wm8350_i2c_exit(void)
114	{
115	i2c_del_driver(&wm8350_i2c_driver);
116	}
117	module_exit(wm8350_i2c_exit);
118
119	MODULE_DESCRIPTION("I2C support for the WM8350 AudioPlus PMIC");
120	MODULE_LICENSE("GPL");