[linux.git] / drivers / mfd / tps6507x.c

/*
 * tps6507x.c  --  TPS6507x chip family multi-function driver
 *
 *  Copyright (c) 2010 RidgeRun ([email protected])
 *
 * Author: Todd Fischer
 *         [email protected]
 *
 * Credits:
 *
 *    Using code from wm831x-*.c, wm8400-core, Wolfson Microelectronics PLC.
 *
 * For licencing details see kernel-base/COPYING
 *
 */

#include <linux/module.h>
#include <linux/moduleparam.h>
#include <linux/init.h>
#include <linux/slab.h>
#include <linux/i2c.h>
#include <linux/mfd/core.h>
#include <linux/mfd/tps6507x.h>

static struct mfd_cell tps6507x_devs[] = {
	{
		.name = "tps6507x-pmic",
	},
	{
		.name = "tps6507x-ts",
	},
};


static int tps6507x_i2c_read_device(struct tps6507x_dev *tps6507x, char reg,
				  int bytes, void *dest)
{
	struct i2c_client *i2c = tps6507x->i2c_client;
	struct i2c_msg xfer[2];
	int ret;

	/* Write register */
	xfer[0].addr = i2c->addr;
	xfer[0].flags = 0;
	xfer[0].len = 1;
	xfer[0].buf = &reg;

	/* Read data */
	xfer[1].addr = i2c->addr;
	xfer[1].flags = I2C_M_RD;
	xfer[1].len = bytes;
	xfer[1].buf = dest;

	ret = i2c_transfer(i2c->adapter, xfer, 2);
	if (ret == 2)
		ret = 0;
	else if (ret >= 0)
		ret = -EIO;

	return ret;
}

static int tps6507x_i2c_write_device(struct tps6507x_dev *tps6507x, char reg,
				   int bytes, void *src)
{
	struct i2c_client *i2c = tps6507x->i2c_client;
	/* we add 1 byte for device register */
	u8 msg[TPS6507X_MAX_REGISTER + 1];
	int ret;

	if (bytes > (TPS6507X_MAX_REGISTER + 1))
		return -EINVAL;

	msg[0] = reg;
	memcpy(&msg[1], src, bytes);

	ret = i2c_master_send(i2c, msg, bytes + 1);
	if (ret < 0)
		return ret;
	if (ret != bytes + 1)
		return -EIO;
	return 0;
}

static int tps6507x_i2c_probe(struct i2c_client *i2c,
			    const struct i2c_device_id *id)
{
	struct tps6507x_dev *tps6507x;
	int ret = 0;

	tps6507x = kzalloc(sizeof(struct tps6507x_dev), GFP_KERNEL);
	if (tps6507x == NULL)
		return -ENOMEM;

	i2c_set_clientdata(i2c, tps6507x);
	tps6507x->dev = &i2c->dev;
	tps6507x->i2c_client = i2c;
	tps6507x->read_dev = tps6507x_i2c_read_device;
	tps6507x->write_dev = tps6507x_i2c_write_device;

	ret = mfd_add_devices(tps6507x->dev, -1,
			      tps6507x_devs, ARRAY_SIZE(tps6507x_devs),
			      NULL, 0);

	if (ret < 0)
		goto err;

	return ret;

err:
	mfd_remove_devices(tps6507x->dev);
	kfree(tps6507x);
	return ret;
}

static int tps6507x_i2c_remove(struct i2c_client *i2c)
{
	struct tps6507x_dev *tps6507x = i2c_get_clientdata(i2c);

	mfd_remove_devices(tps6507x->dev);
	kfree(tps6507x);

	return 0;
}

static const struct i2c_device_id tps6507x_i2c_id[] = {
       { "tps6507x", 0 },
       { }
};
MODULE_DEVICE_TABLE(i2c, tps6507x_i2c_id);


static struct i2c_driver tps6507x_i2c_driver = {
	.driver = {
		   .name = "tps6507x",
		   .owner = THIS_MODULE,
	},
	.probe = tps6507x_i2c_probe,
	.remove = tps6507x_i2c_remove,
	.id_table = tps6507x_i2c_id,
};

static int __init tps6507x_i2c_init(void)
{
	return i2c_add_driver(&tps6507x_i2c_driver);
}
/* init early so consumer devices can complete system boot */
subsys_initcall(tps6507x_i2c_init);

static void __exit tps6507x_i2c_exit(void)
{
	i2c_del_driver(&tps6507x_i2c_driver);
}
module_exit(tps6507x_i2c_exit);

MODULE_DESCRIPTION("TPS6507x chip family multi-function driver");
MODULE_LICENSE("GPL");
Commit	Line	Data
31dd6a26 TF	1	/*
	2	* tps6507x.c -- TPS6507x chip family multi-function driver
	3	*
	4	* Copyright (c) 2010 RidgeRun ([email protected])
	5	*
	6	* Author: Todd Fischer
	7	* [email protected]
	8	*
	9	* Credits:
	10	*
	11	* Using code from wm831x-*.c, wm8400-core, Wolfson Microelectronics PLC.
	12	*
	13	* For licencing details see kernel-base/COPYING
	14	*
	15	*/
	16
	17	#include <linux/module.h>
	18	#include <linux/moduleparam.h>
	19	#include <linux/init.h>
	20	#include <linux/slab.h>
	21	#include <linux/i2c.h>
	22	#include <linux/mfd/core.h>
	23	#include <linux/mfd/tps6507x.h>
	24
	25	static struct mfd_cell tps6507x_devs[] = {
	26	{
	27	.name = "tps6507x-pmic",
	28	},
75259966 TF	29	{
	30	.name = "tps6507x-ts",
	31	},
31dd6a26 TF	32	};
	33
	34
	35	static int tps6507x_i2c_read_device(struct tps6507x_dev *tps6507x, char reg,
	36	int bytes, void *dest)
	37	{
	38	struct i2c_client *i2c = tps6507x->i2c_client;
	39	struct i2c_msg xfer[2];
	40	int ret;
	41
	42	/* Write register */
	43	xfer[0].addr = i2c->addr;
	44	xfer[0].flags = 0;
	45	xfer[0].len = 1;
	46	xfer[0].buf = ®
	47
	48	/* Read data */
	49	xfer[1].addr = i2c->addr;
	50	xfer[1].flags = I2C_M_RD;
	51	xfer[1].len = bytes;
	52	xfer[1].buf = dest;
	53
	54	ret = i2c_transfer(i2c->adapter, xfer, 2);
	55	if (ret == 2)
	56	ret = 0;
	57	else if (ret >= 0)
	58	ret = -EIO;
	59
	60	return ret;
	61	}
	62
	63	static int tps6507x_i2c_write_device(struct tps6507x_dev *tps6507x, char reg,
	64	int bytes, void *src)
	65	{
	66	struct i2c_client *i2c = tps6507x->i2c_client;
	67	/* we add 1 byte for device register */
	68	u8 msg[TPS6507X_MAX_REGISTER + 1];
	69	int ret;
	70
	71	if (bytes > (TPS6507X_MAX_REGISTER + 1))
	72	return -EINVAL;
	73
	74	msg[0] = reg;
	75	memcpy(&msg[1], src, bytes);
	76
	77	ret = i2c_master_send(i2c, msg, bytes + 1);
	78	if (ret < 0)
	79	return ret;
	80	if (ret != bytes + 1)
	81	return -EIO;
	82	return 0;
	83	}
	84
	85	static int tps6507x_i2c_probe(struct i2c_client *i2c,
	86	const struct i2c_device_id *id)
	87	{
	88	struct tps6507x_dev *tps6507x;
	89	int ret = 0;
	90
	91	tps6507x = kzalloc(sizeof(struct tps6507x_dev), GFP_KERNEL);
04a06423	92	if (tps6507x == NULL)
31dd6a26	93	return -ENOMEM;
31dd6a26 TF	94
	95	i2c_set_clientdata(i2c, tps6507x);
	96	tps6507x->dev = &i2c->dev;
	97	tps6507x->i2c_client = i2c;
	98	tps6507x->read_dev = tps6507x_i2c_read_device;
	99	tps6507x->write_dev = tps6507x_i2c_write_device;
	100
	101	ret = mfd_add_devices(tps6507x->dev, -1,
	102	tps6507x_devs, ARRAY_SIZE(tps6507x_devs),
	103	NULL, 0);
	104
	105	if (ret < 0)
	106	goto err;
	107
	108	return ret;
	109
	110	err:
	111	mfd_remove_devices(tps6507x->dev);
	112	kfree(tps6507x);
	113	return ret;
	114	}
	115
	116	static int tps6507x_i2c_remove(struct i2c_client *i2c)
	117	{
	118	struct tps6507x_dev *tps6507x = i2c_get_clientdata(i2c);
	119
	120	mfd_remove_devices(tps6507x->dev);
	121	kfree(tps6507x);
	122
	123	return 0;
	124	}
	125
	126	static const struct i2c_device_id tps6507x_i2c_id[] = {
	127	{ "tps6507x", 0 },
	128	{ }
	129	};
	130	MODULE_DEVICE_TABLE(i2c, tps6507x_i2c_id);
	131
	132
	133	static struct i2c_driver tps6507x_i2c_driver = {
	134	.driver = {
	135	.name = "tps6507x",
	136	.owner = THIS_MODULE,
	137	},
	138	.probe = tps6507x_i2c_probe,
	139	.remove = tps6507x_i2c_remove,
	140	.id_table = tps6507x_i2c_id,
	141	};
	142
	143	static int __init tps6507x_i2c_init(void)
	144	{
	145	return i2c_add_driver(&tps6507x_i2c_driver);
	146	}
	147	/* init early so consumer devices can complete system boot */
	148	subsys_initcall(tps6507x_i2c_init);
	149
	150	static void __exit tps6507x_i2c_exit(void)
	151	{
	152	i2c_del_driver(&tps6507x_i2c_driver);
	153	}
	154	module_exit(tps6507x_i2c_exit);
	155
	156	MODULE_DESCRIPTION("TPS6507x chip family multi-function driver");
	157	MODULE_LICENSE("GPL");