[net-next-2.6.git] / drivers / mfd / wm831x-i2c.c

/*
 * wm831x-i2c.c  --  I2C access for Wolfson WM831x PMICs
 *
 * Copyright 2009,2010 Wolfson Microelectronics PLC.
 *
 * Author: Mark Brown <broonie@opensource.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/kernel.h>
#include <linux/module.h>
#include <linux/i2c.h>
#include <linux/delay.h>
#include <linux/mfd/core.h>
#include <linux/slab.h>

#include <linux/mfd/wm831x/core.h>
#include <linux/mfd/wm831x/pdata.h>

static int wm831x_i2c_read_device(struct wm831x *wm831x, unsigned short reg,
				  int bytes, void *dest)
{
	struct i2c_client *i2c = wm831x->control_data;
	int ret;
	u16 r = cpu_to_be16(reg);

	ret = i2c_master_send(i2c, (unsigned char *)&r, 2);
	if (ret < 0)
		return ret;
	if (ret != 2)
		return -EIO;

	ret = i2c_master_recv(i2c, dest, bytes);
	if (ret < 0)
		return ret;
	if (ret != bytes)
		return -EIO;
	return 0;
}

/* Currently we allocate the write buffer on the stack; this is OK for
 * small writes - if we need to do large writes this will need to be
 * revised.
 */
static int wm831x_i2c_write_device(struct wm831x *wm831x, unsigned short reg,
				   int bytes, void *src)
{
	struct i2c_client *i2c = wm831x->control_data;
	unsigned char msg[bytes + 2];
	int ret;

	reg = cpu_to_be16(reg);
	memcpy(&msg[0], &reg, 2);
	memcpy(&msg[2], src, bytes);

	ret = i2c_master_send(i2c, msg, bytes + 2);
	if (ret < 0)
		return ret;
	if (ret < bytes + 2)
		return -EIO;

	return 0;
}

static int wm831x_i2c_probe(struct i2c_client *i2c,
			    const struct i2c_device_id *id)
{
	struct wm831x *wm831x;

	wm831x = kzalloc(sizeof(struct wm831x), GFP_KERNEL);
	if (wm831x == NULL)
		return -ENOMEM;

	i2c_set_clientdata(i2c, wm831x);
	wm831x->dev = &i2c->dev;
	wm831x->control_data = i2c;
	wm831x->read_dev = wm831x_i2c_read_device;
	wm831x->write_dev = wm831x_i2c_write_device;

	return wm831x_device_init(wm831x, id->driver_data, i2c->irq);
}

static int wm831x_i2c_remove(struct i2c_client *i2c)
{
	struct wm831x *wm831x = i2c_get_clientdata(i2c);

	wm831x_device_exit(wm831x);

	return 0;
}

static int wm831x_i2c_suspend(struct i2c_client *i2c, pm_message_t mesg)
{
	struct wm831x *wm831x = i2c_get_clientdata(i2c);

	return wm831x_device_suspend(wm831x);
}

static const struct i2c_device_id wm831x_i2c_id[] = {
	{ "wm8310", WM8310 },
	{ "wm8311", WM8311 },
	{ "wm8312", WM8312 },
	{ "wm8320", WM8320 },
	{ "wm8321", WM8321 },
	{ "wm8325", WM8325 },
	{ }
};
MODULE_DEVICE_TABLE(i2c, wm831x_i2c_id);


static struct i2c_driver wm831x_i2c_driver = {
	.driver = {
		   .name = "wm831x",
		   .owner = THIS_MODULE,
	},
	.probe = wm831x_i2c_probe,
	.remove = wm831x_i2c_remove,
	.suspend = wm831x_i2c_suspend,
	.id_table = wm831x_i2c_id,
};

static int __init wm831x_i2c_init(void)
{
	int ret;

	ret = i2c_add_driver(&wm831x_i2c_driver);
	if (ret != 0)
		pr_err("Failed to register wm831x I2C driver: %d\n", ret);

	return ret;
}
subsys_initcall(wm831x_i2c_init);

static void __exit wm831x_i2c_exit(void)
{
	i2c_del_driver(&wm831x_i2c_driver);
}
module_exit(wm831x_i2c_exit);
Commit	Line	Data
e5b48684 MB	1	/*
	2	* wm831x-i2c.c -- I2C access for Wolfson WM831x PMICs
	3	*
	4	* Copyright 2009,2010 Wolfson Microelectronics PLC.
	5	*
	6	* Author: Mark Brown <broonie@opensource.wolfsonmicro.com>
	7	*
	8	* This program is free software; you can redistribute it and/or modify it
	9	* under the terms of the GNU General Public License as published by the
	10	* Free Software Foundation; either version 2 of the License, or (at your
	11	* option) any later version.
	12	*
	13	*/
	14
	15	#include <linux/kernel.h>
	16	#include <linux/module.h>
	17	#include <linux/i2c.h>
	18	#include <linux/delay.h>
	19	#include <linux/mfd/core.h>
	20	#include <linux/slab.h>
	21
	22	#include <linux/mfd/wm831x/core.h>
	23	#include <linux/mfd/wm831x/pdata.h>
	24
	25	static int wm831x_i2c_read_device(struct wm831x *wm831x, unsigned short reg,
	26	int bytes, void *dest)
	27	{
	28	struct i2c_client *i2c = wm831x->control_data;
	29	int ret;
	30	u16 r = cpu_to_be16(reg);
	31
	32	ret = i2c_master_send(i2c, (unsigned char *)&r, 2);
	33	if (ret < 0)
	34	return ret;
	35	if (ret != 2)
	36	return -EIO;
	37
	38	ret = i2c_master_recv(i2c, dest, bytes);
	39	if (ret < 0)
	40	return ret;
	41	if (ret != bytes)
	42	return -EIO;
	43	return 0;
	44	}
	45
	46	/* Currently we allocate the write buffer on the stack; this is OK for
	47	* small writes - if we need to do large writes this will need to be
	48	* revised.
	49	*/
	50	static int wm831x_i2c_write_device(struct wm831x *wm831x, unsigned short reg,
	51	int bytes, void *src)
	52	{
	53	struct i2c_client *i2c = wm831x->control_data;
	54	unsigned char msg[bytes + 2];
	55	int ret;
	56
	57	reg = cpu_to_be16(reg);
	58	memcpy(&msg[0], &reg, 2);
	59	memcpy(&msg[2], src, bytes);
	60
	61	ret = i2c_master_send(i2c, msg, bytes + 2);
	62	if (ret < 0)
	63	return ret;
	64	if (ret < bytes + 2)
65	return -EIO;
66
67	return 0;
68	}
69
70	static int wm831x_i2c_probe(struct i2c_client *i2c,
71	const struct i2c_device_id *id)
72	{
73	struct wm831x *wm831x;
74
75	wm831x = kzalloc(sizeof(struct wm831x), GFP_KERNEL);
76	if (wm831x == NULL)
77	return -ENOMEM;
78
79	i2c_set_clientdata(i2c, wm831x);
80	wm831x->dev = &i2c->dev;
81	wm831x->control_data = i2c;
82	wm831x->read_dev = wm831x_i2c_read_device;
83	wm831x->write_dev = wm831x_i2c_write_device;
84
85	return wm831x_device_init(wm831x, id->driver_data, i2c->irq);
86	}
87
88	static int wm831x_i2c_remove(struct i2c_client *i2c)
89	{
90	struct wm831x *wm831x = i2c_get_clientdata(i2c);
91
92	wm831x_device_exit(wm831x);
93
94	return 0;
95	}
96
97	static int wm831x_i2c_suspend(struct i2c_client *i2c, pm_message_t mesg)
98	{
99	struct wm831x *wm831x = i2c_get_clientdata(i2c);
100
101	return wm831x_device_suspend(wm831x);
102	}
103
104	static const struct i2c_device_id wm831x_i2c_id[] = {
105	{ "wm8310", WM8310 },
106	{ "wm8311", WM8311 },
107	{ "wm8312", WM8312 },
108	{ "wm8320", WM8320 },
109	{ "wm8321", WM8321 },
110	{ "wm8325", WM8325 },
111	{ }
112	};
113	MODULE_DEVICE_TABLE(i2c, wm831x_i2c_id);
114
115
116	static struct i2c_driver wm831x_i2c_driver = {
117	.driver = {
118	.name = "wm831x",
119	.owner = THIS_MODULE,
120	},
121	.probe = wm831x_i2c_probe,
122	.remove = wm831x_i2c_remove,
123	.suspend = wm831x_i2c_suspend,
124	.id_table = wm831x_i2c_id,
125	};
126
127	static int __init wm831x_i2c_init(void)
128	{
129	int ret;
130
131	ret = i2c_add_driver(&wm831x_i2c_driver);
132	if (ret != 0)
133	pr_err("Failed to register wm831x I2C driver: %d\n", ret);
134
135	return ret;
136	}
137	subsys_initcall(wm831x_i2c_init);
138
139	static void __exit wm831x_i2c_exit(void)
140	{
141	i2c_del_driver(&wm831x_i2c_driver);
142	}
143	module_exit(wm831x_i2c_exit);