[linux-2.6-block.git] / drivers / mfd / 88pm860x-i2c.c

/*
 * I2C driver for Marvell 88PM860x
 *
 * Copyright (C) 2009 Marvell International Ltd.
 *
 * Author: Haojian Zhuang <haojian.zhuang@marvell.com>
 *
 * 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.
 */
#include <linux/kernel.h>
#include <linux/module.h>
#include <linux/i2c.h>
#include <linux/regmap.h>
#include <linux/mfd/88pm860x.h>

int pm860x_reg_read(struct i2c_client *i2c, int reg)
{
	struct pm860x_chip *chip = i2c_get_clientdata(i2c);
	struct regmap *map = (i2c == chip->client) ? chip->regmap
				: chip->regmap_companion;
	unsigned int data;
	int ret;

	ret = regmap_read(map, reg, &data);
	if (ret < 0)
		return ret;
	else
		return (int)data;
}
EXPORT_SYMBOL(pm860x_reg_read);

int pm860x_reg_write(struct i2c_client *i2c, int reg,
		     unsigned char data)
{
	struct pm860x_chip *chip = i2c_get_clientdata(i2c);
	struct regmap *map = (i2c == chip->client) ? chip->regmap
				: chip->regmap_companion;
	int ret;

	ret = regmap_write(map, reg, data);
	return ret;
}
EXPORT_SYMBOL(pm860x_reg_write);

int pm860x_bulk_read(struct i2c_client *i2c, int reg,
		     int count, unsigned char *buf)
{
	struct pm860x_chip *chip = i2c_get_clientdata(i2c);
	struct regmap *map = (i2c == chip->client) ? chip->regmap
				: chip->regmap_companion;
	int ret;

	ret = regmap_raw_read(map, reg, buf, count);
	return ret;
}
EXPORT_SYMBOL(pm860x_bulk_read);

int pm860x_bulk_write(struct i2c_client *i2c, int reg,
		      int count, unsigned char *buf)
{
	struct pm860x_chip *chip = i2c_get_clientdata(i2c);
	struct regmap *map = (i2c == chip->client) ? chip->regmap
				: chip->regmap_companion;
	int ret;

	ret = regmap_raw_write(map, reg, buf, count);
	return ret;
}
EXPORT_SYMBOL(pm860x_bulk_write);

int pm860x_set_bits(struct i2c_client *i2c, int reg,
		    unsigned char mask, unsigned char data)
{
	struct pm860x_chip *chip = i2c_get_clientdata(i2c);
	struct regmap *map = (i2c == chip->client) ? chip->regmap
				: chip->regmap_companion;
	int ret;

	ret = regmap_update_bits(map, reg, mask, data);
	return ret;
}
EXPORT_SYMBOL(pm860x_set_bits);

static int read_device(struct i2c_client *i2c, int reg,
		       int bytes, void *dest)
{
	unsigned char msgbuf0[I2C_SMBUS_BLOCK_MAX + 3];
	unsigned char msgbuf1[I2C_SMBUS_BLOCK_MAX + 2];
	struct i2c_adapter *adap = i2c->adapter;
	struct i2c_msg msg[2] = {
					{
						.addr = i2c->addr,
						.flags = 0,
						.len = 1,
						.buf = msgbuf0
					},
					{	.addr = i2c->addr,
						.flags = I2C_M_RD,
						.len = 0,
						.buf = msgbuf1
					},
				};
	int num = 1, ret = 0;

	if (dest == NULL)
		return -EINVAL;
	msgbuf0[0] = (unsigned char)reg;	/* command */
	msg[1].len = bytes;

	/* if data needs to read back, num should be 2 */
	if (bytes > 0)
		num = 2;
	ret = adap->algo->master_xfer(adap, msg, num);
	memcpy(dest, msgbuf1, bytes);
	if (ret < 0)
		return ret;
	return 0;
}

static int write_device(struct i2c_client *i2c, int reg,
			int bytes, void *src)
{
	unsigned char buf[2];
	struct i2c_adapter *adap = i2c->adapter;
	struct i2c_msg msg;
	int ret;

	buf[0] = (unsigned char)reg;
	memcpy(&buf[1], src, bytes);
	msg.addr = i2c->addr;
	msg.flags = 0;
	msg.len = bytes + 1;
	msg.buf = buf;

	ret = adap->algo->master_xfer(adap, &msg, 1);
	if (ret < 0)
		return ret;
	return 0;
}

int pm860x_page_reg_write(struct i2c_client *i2c, int reg,
			  unsigned char data)
{
	unsigned char zero;
	int ret;

	i2c_lock_adapter(i2c->adapter);
	read_device(i2c, 0xFA, 0, &zero);
	read_device(i2c, 0xFB, 0, &zero);
	read_device(i2c, 0xFF, 0, &zero);
	ret = write_device(i2c, reg, 1, &data);
	read_device(i2c, 0xFE, 0, &zero);
	read_device(i2c, 0xFC, 0, &zero);
	i2c_unlock_adapter(i2c->adapter);
	return ret;
}
EXPORT_SYMBOL(pm860x_page_reg_write);

int pm860x_page_bulk_read(struct i2c_client *i2c, int reg,
			  int count, unsigned char *buf)
{
	unsigned char zero = 0;
	int ret;

	i2c_lock_adapter(i2c->adapter);
	read_device(i2c, 0xfa, 0, &zero);
	read_device(i2c, 0xfb, 0, &zero);
	read_device(i2c, 0xff, 0, &zero);
	ret = read_device(i2c, reg, count, buf);
	read_device(i2c, 0xFE, 0, &zero);
	read_device(i2c, 0xFC, 0, &zero);
	i2c_unlock_adapter(i2c->adapter);
	return ret;
}
EXPORT_SYMBOL(pm860x_page_bulk_read);
Commit	Line	Data
bbd51b1f	1	/*
53dbab7a	2	* I2C driver for Marvell 88PM860x
bbd51b1f HZ	3	*
bbd51b1f HZ	4	* Copyright (C) 2009 Marvell International Ltd.
0363be8b LJ	5	*
0363be8b LJ	6	* Author: Haojian Zhuang <haojian.zhuang@marvell.com>
bbd51b1f HZ	7	*
	8	* This program is free software; you can redistribute it and/or modify
	9	* it under the terms of the GNU General Public License version 2 as
	10	* published by the Free Software Foundation.
	11	*/
	12	#include <linux/kernel.h>
	13	#include <linux/module.h>
bbd51b1f	14	#include <linux/i2c.h>
b46a36c0	15	#include <linux/regmap.h>
53dbab7a	16	#include <linux/mfd/88pm860x.h>
bbd51b1f	17
53dbab7a	18	int pm860x_reg_read(struct i2c_client *i2c, int reg)
bbd51b1f	19	{
53dbab7a	20	struct pm860x_chip *chip = i2c_get_clientdata(i2c);
b46a36c0 JZ	21	struct regmap *map = (i2c == chip->client) ? chip->regmap
	22	: chip->regmap_companion;
	23	unsigned int data;
bbd51b1f HZ	24	int ret;
bbd51b1f HZ	25
b46a36c0	26	ret = regmap_read(map, reg, &data);
bbd51b1f HZ	27	if (ret < 0)
	28	return ret;
	29	else
	30	return (int)data;
	31	}
53dbab7a	32	EXPORT_SYMBOL(pm860x_reg_read);
bbd51b1f	33
53dbab7a	34	int pm860x_reg_write(struct i2c_client *i2c, int reg,
bbd51b1f HZ	35	unsigned char data)
bbd51b1f HZ	36	{
53dbab7a	37	struct pm860x_chip *chip = i2c_get_clientdata(i2c);
b46a36c0 JZ	38	struct regmap *map = (i2c == chip->client) ? chip->regmap
b46a36c0 JZ	39	: chip->regmap_companion;
bbd51b1f HZ	40	int ret;
bbd51b1f HZ	41
b46a36c0	42	ret = regmap_write(map, reg, data);
bbd51b1f HZ	43	return ret;
bbd51b1f HZ	44	}
53dbab7a	45	EXPORT_SYMBOL(pm860x_reg_write);
bbd51b1f	46
53dbab7a	47	int pm860x_bulk_read(struct i2c_client *i2c, int reg,
bbd51b1f HZ	48	int count, unsigned char *buf)
bbd51b1f HZ	49	{
53dbab7a	50	struct pm860x_chip *chip = i2c_get_clientdata(i2c);
b46a36c0 JZ	51	struct regmap *map = (i2c == chip->client) ? chip->regmap
b46a36c0 JZ	52	: chip->regmap_companion;
bbd51b1f HZ	53	int ret;
bbd51b1f HZ	54
b46a36c0	55	ret = regmap_raw_read(map, reg, buf, count);
bbd51b1f HZ	56	return ret;
bbd51b1f HZ	57	}
53dbab7a	58	EXPORT_SYMBOL(pm860x_bulk_read);
bbd51b1f	59
53dbab7a	60	int pm860x_bulk_write(struct i2c_client *i2c, int reg,
bbd51b1f HZ	61	int count, unsigned char *buf)
bbd51b1f HZ	62	{
53dbab7a	63	struct pm860x_chip *chip = i2c_get_clientdata(i2c);
b46a36c0 JZ	64	struct regmap *map = (i2c == chip->client) ? chip->regmap
b46a36c0 JZ	65	: chip->regmap_companion;
bbd51b1f HZ	66	int ret;
bbd51b1f HZ	67
b46a36c0	68	ret = regmap_raw_write(map, reg, buf, count);
bbd51b1f HZ	69	return ret;
bbd51b1f HZ	70	}
53dbab7a	71	EXPORT_SYMBOL(pm860x_bulk_write);
bbd51b1f	72
53dbab7a	73	int pm860x_set_bits(struct i2c_client *i2c, int reg,
bbd51b1f HZ	74	unsigned char mask, unsigned char data)
bbd51b1f HZ	75	{
53dbab7a	76	struct pm860x_chip *chip = i2c_get_clientdata(i2c);
b46a36c0 JZ	77	struct regmap *map = (i2c == chip->client) ? chip->regmap
b46a36c0 JZ	78	: chip->regmap_companion;
bbd51b1f HZ	79	int ret;
bbd51b1f HZ	80
b46a36c0	81	ret = regmap_update_bits(map, reg, mask, data);
bbd51b1f HZ	82	return ret;
bbd51b1f HZ	83	}
53dbab7a	84	EXPORT_SYMBOL(pm860x_set_bits);
bbd51b1f	85
5bdf7411 JZ	86	static int read_device(struct i2c_client *i2c, int reg,
	87	int bytes, void *dest)
	88	{
	89	unsigned char msgbuf0[I2C_SMBUS_BLOCK_MAX + 3];
	90	unsigned char msgbuf1[I2C_SMBUS_BLOCK_MAX + 2];
	91	struct i2c_adapter *adap = i2c->adapter;
48942222 S	92	struct i2c_msg msg[2] = {
	93	{
	94	.addr = i2c->addr,
	95	.flags = 0,
	96	.len = 1,
	97	.buf = msgbuf0
	98	},
	99	{ .addr = i2c->addr,
	100	.flags = I2C_M_RD,
	101	.len = 0,
	102	.buf = msgbuf1
	103	},
5bdf7411 JZ	104	};
	105	int num = 1, ret = 0;
	106
	107	if (dest == NULL)
	108	return -EINVAL;
	109	msgbuf0[0] = (unsigned char)reg; /* command */
	110	msg[1].len = bytes;
	111
	112	/* if data needs to read back, num should be 2 */
	113	if (bytes > 0)
	114	num = 2;
	115	ret = adap->algo->master_xfer(adap, msg, num);
	116	memcpy(dest, msgbuf1, bytes);
	117	if (ret < 0)
	118	return ret;
	119	return 0;
	120	}
	121
	122	static int write_device(struct i2c_client *i2c, int reg,
	123	int bytes, void *src)
	124	{
7a36ceb2	125	unsigned char buf[2];
5bdf7411 JZ	126	struct i2c_adapter *adap = i2c->adapter;
	127	struct i2c_msg msg;
	128	int ret;
	129
	130	buf[0] = (unsigned char)reg;
	131	memcpy(&buf[1], src, bytes);
	132	msg.addr = i2c->addr;
	133	msg.flags = 0;
	134	msg.len = bytes + 1;
	135	msg.buf = buf;
	136
	137	ret = adap->algo->master_xfer(adap, &msg, 1);
	138	if (ret < 0)
	139	return ret;
	140	return 0;
	141	}
	142
09b03419 HZ	143	int pm860x_page_reg_write(struct i2c_client *i2c, int reg,
	144	unsigned char data)
	145	{
09b03419 HZ	146	unsigned char zero;
	147	int ret;
	148
5bdf7411 JZ	149	i2c_lock_adapter(i2c->adapter);
	150	read_device(i2c, 0xFA, 0, &zero);
	151	read_device(i2c, 0xFB, 0, &zero);
	152	read_device(i2c, 0xFF, 0, &zero);
	153	ret = write_device(i2c, reg, 1, &data);
	154	read_device(i2c, 0xFE, 0, &zero);
	155	read_device(i2c, 0xFC, 0, &zero);
	156	i2c_unlock_adapter(i2c->adapter);
09b03419 HZ	157	return ret;
	158	}
	159	EXPORT_SYMBOL(pm860x_page_reg_write);
	160
	161	int pm860x_page_bulk_read(struct i2c_client *i2c, int reg,
	162	int count, unsigned char *buf)
	163	{
09b03419 HZ	164	unsigned char zero = 0;
	165	int ret;
	166
5bdf7411 JZ	167	i2c_lock_adapter(i2c->adapter);
	168	read_device(i2c, 0xfa, 0, &zero);
	169	read_device(i2c, 0xfb, 0, &zero);
	170	read_device(i2c, 0xff, 0, &zero);
	171	ret = read_device(i2c, reg, count, buf);
	172	read_device(i2c, 0xFE, 0, &zero);
	173	read_device(i2c, 0xFC, 0, &zero);
	174	i2c_unlock_adapter(i2c->adapter);
09b03419 HZ	175	return ret;
	176	}
	177	EXPORT_SYMBOL(pm860x_page_bulk_read);