[mirror_ubuntu-artful-kernel.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;
	struct i2c_msg xfer[2];
	int ret;

	reg = cpu_to_be16(reg);

	xfer[0].addr = i2c->addr;
	xfer[0].flags = 0;
	xfer[0].len = 2;
	xfer[0].buf = (char *)&reg;

	xfer[1].addr = i2c->addr;
	xfer[1].flags = I2C_M_NOSTART;
	xfer[1].len = bytes;
	xfer[1].buf = (char *)src;

	ret = i2c_transfer(i2c->adapter, xfer, 2);
	if (ret < 0)
		return ret;
	if (ret != 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 device *dev)
{
	struct wm831x *wm831x = dev_get_drvdata(dev);

	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 },
	{ "wm8326", WM8326 },
	{ }
};
MODULE_DEVICE_TABLE(i2c, wm831x_i2c_id);

static const struct dev_pm_ops wm831x_pm_ops = {
	.suspend = wm831x_i2c_suspend,
};

static struct i2c_driver wm831x_i2c_driver = {
	.driver = {
		.name = "wm831x",
		.owner = THIS_MODULE,
		.pm = &wm831x_pm_ops,
	},
	.probe = wm831x_i2c_probe,
	.remove = wm831x_i2c_remove,
	.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;
4c4d8878	54	struct i2c_msg xfer[2];
e5b48684 MB	55	int ret;
	56
	57	reg = cpu_to_be16(reg);
e5b48684	58
4c4d8878 MB	59	xfer[0].addr = i2c->addr;
	60	xfer[0].flags = 0;
	61	xfer[0].len = 2;
	62	xfer[0].buf = (char *)®
	63
	64	xfer[1].addr = i2c->addr;
	65	xfer[1].flags = I2C_M_NOSTART;
	66	xfer[1].len = bytes;
	67	xfer[1].buf = (char *)src;
	68
	69	ret = i2c_transfer(i2c->adapter, xfer, 2);
e5b48684 MB	70	if (ret < 0)
e5b48684 MB	71	return ret;
4c4d8878	72	if (ret != 2)
e5b48684 MB	73	return -EIO;
	74
	75	return 0;
	76	}
	77
	78	static int wm831x_i2c_probe(struct i2c_client *i2c,
	79	const struct i2c_device_id *id)
	80	{
	81	struct wm831x *wm831x;
	82
	83	wm831x = kzalloc(sizeof(struct wm831x), GFP_KERNEL);
	84	if (wm831x == NULL)
	85	return -ENOMEM;
	86
	87	i2c_set_clientdata(i2c, wm831x);
	88	wm831x->dev = &i2c->dev;
	89	wm831x->control_data = i2c;
	90	wm831x->read_dev = wm831x_i2c_read_device;
	91	wm831x->write_dev = wm831x_i2c_write_device;
	92
	93	return wm831x_device_init(wm831x, id->driver_data, i2c->irq);
	94	}
	95
	96	static int wm831x_i2c_remove(struct i2c_client *i2c)
	97	{
	98	struct wm831x *wm831x = i2c_get_clientdata(i2c);
	99
	100	wm831x_device_exit(wm831x);
	101
	102	return 0;
	103	}
	104
c538ddbe	105	static int wm831x_i2c_suspend(struct device *dev)
e5b48684	106	{
c538ddbe	107	struct wm831x *wm831x = dev_get_drvdata(dev);
e5b48684 MB	108
	109	return wm831x_device_suspend(wm831x);
	110	}
	111
	112	static const struct i2c_device_id wm831x_i2c_id[] = {
	113	{ "wm8310", WM8310 },
	114	{ "wm8311", WM8311 },
	115	{ "wm8312", WM8312 },
	116	{ "wm8320", WM8320 },
	117	{ "wm8321", WM8321 },
	118	{ "wm8325", WM8325 },
412dc11d	119	{ "wm8326", WM8326 },
e5b48684 MB	120	{ }
	121	};
	122	MODULE_DEVICE_TABLE(i2c, wm831x_i2c_id);
	123
c538ddbe MB	124	static const struct dev_pm_ops wm831x_pm_ops = {
	125	.suspend = wm831x_i2c_suspend,
	126	};
e5b48684 MB	127
	128	static struct i2c_driver wm831x_i2c_driver = {
	129	.driver = {
c538ddbe MB	130	.name = "wm831x",
	131	.owner = THIS_MODULE,
	132	.pm = &wm831x_pm_ops,
e5b48684 MB	133	},
	134	.probe = wm831x_i2c_probe,
	135	.remove = wm831x_i2c_remove,
e5b48684 MB	136	.id_table = wm831x_i2c_id,
	137	};
	138
	139	static int __init wm831x_i2c_init(void)
	140	{
	141	int ret;
	142
	143	ret = i2c_add_driver(&wm831x_i2c_driver);
	144	if (ret != 0)
	145	pr_err("Failed to register wm831x I2C driver: %d\n", ret);
	146
	147	return ret;
	148	}
	149	subsys_initcall(wm831x_i2c_init);
	150
	151	static void __exit wm831x_i2c_exit(void)
	152	{
	153	i2c_del_driver(&wm831x_i2c_driver);
	154	}
	155	module_exit(wm831x_i2c_exit);