[mirror_ubuntu-focal-kernel.git] / drivers / mfd / 88pm860x-i2c.c

// SPDX-License-Identifier: GPL-2.0-only
/*
 * I2C driver for Marvell 88PM860x
 *
 * Copyright (C) 2009 Marvell International Ltd.
 *
 * Author: Haojian Zhuang <haojian.zhuang@marvell.com>
 */
#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_bus(i2c->adapter, I2C_LOCK_SEGMENT);
	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_bus(i2c->adapter, I2C_LOCK_SEGMENT);
	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_bus(i2c->adapter, I2C_LOCK_SEGMENT);
	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_bus(i2c->adapter, I2C_LOCK_SEGMENT);
	return ret;
}
EXPORT_SYMBOL(pm860x_page_bulk_read);
Commit	Line	Data
d2912cb1	1	// SPDX-License-Identifier: GPL-2.0-only
bbd51b1f	2	/*
53dbab7a	3	* I2C driver for Marvell 88PM860x
bbd51b1f HZ	4	*
bbd51b1f HZ	5	* Copyright (C) 2009 Marvell International Ltd.
0363be8b LJ	6	*
0363be8b LJ	7	* Author: Haojian Zhuang <haojian.zhuang@marvell.com>
bbd51b1f HZ	8	*/
	9	#include <linux/kernel.h>
	10	#include <linux/module.h>
bbd51b1f	11	#include <linux/i2c.h>
b46a36c0	12	#include <linux/regmap.h>
53dbab7a	13	#include <linux/mfd/88pm860x.h>
bbd51b1f	14
53dbab7a	15	int pm860x_reg_read(struct i2c_client *i2c, int reg)
bbd51b1f	16	{
53dbab7a	17	struct pm860x_chip *chip = i2c_get_clientdata(i2c);
b46a36c0 JZ	18	struct regmap *map = (i2c == chip->client) ? chip->regmap
	19	: chip->regmap_companion;
	20	unsigned int data;
bbd51b1f HZ	21	int ret;
bbd51b1f HZ	22
b46a36c0	23	ret = regmap_read(map, reg, &data);
bbd51b1f HZ	24	if (ret < 0)
	25	return ret;
	26	else
	27	return (int)data;
	28	}
53dbab7a	29	EXPORT_SYMBOL(pm860x_reg_read);
bbd51b1f	30
53dbab7a	31	int pm860x_reg_write(struct i2c_client *i2c, int reg,
bbd51b1f HZ	32	unsigned char data)
bbd51b1f HZ	33	{
53dbab7a	34	struct pm860x_chip *chip = i2c_get_clientdata(i2c);
b46a36c0 JZ	35	struct regmap *map = (i2c == chip->client) ? chip->regmap
b46a36c0 JZ	36	: chip->regmap_companion;
bbd51b1f HZ	37	int ret;
bbd51b1f HZ	38
b46a36c0	39	ret = regmap_write(map, reg, data);
bbd51b1f HZ	40	return ret;
bbd51b1f HZ	41	}
53dbab7a	42	EXPORT_SYMBOL(pm860x_reg_write);
bbd51b1f	43
53dbab7a	44	int pm860x_bulk_read(struct i2c_client *i2c, int reg,
bbd51b1f HZ	45	int count, unsigned char *buf)
bbd51b1f HZ	46	{
53dbab7a	47	struct pm860x_chip *chip = i2c_get_clientdata(i2c);
b46a36c0 JZ	48	struct regmap *map = (i2c == chip->client) ? chip->regmap
b46a36c0 JZ	49	: chip->regmap_companion;
bbd51b1f HZ	50	int ret;
bbd51b1f HZ	51
b46a36c0	52	ret = regmap_raw_read(map, reg, buf, count);
bbd51b1f HZ	53	return ret;
bbd51b1f HZ	54	}
53dbab7a	55	EXPORT_SYMBOL(pm860x_bulk_read);
bbd51b1f	56
53dbab7a	57	int pm860x_bulk_write(struct i2c_client *i2c, int reg,
bbd51b1f HZ	58	int count, unsigned char *buf)
bbd51b1f HZ	59	{
53dbab7a	60	struct pm860x_chip *chip = i2c_get_clientdata(i2c);
b46a36c0 JZ	61	struct regmap *map = (i2c == chip->client) ? chip->regmap
b46a36c0 JZ	62	: chip->regmap_companion;
bbd51b1f HZ	63	int ret;
bbd51b1f HZ	64
b46a36c0	65	ret = regmap_raw_write(map, reg, buf, count);
bbd51b1f HZ	66	return ret;
bbd51b1f HZ	67	}
53dbab7a	68	EXPORT_SYMBOL(pm860x_bulk_write);
bbd51b1f	69
53dbab7a	70	int pm860x_set_bits(struct i2c_client *i2c, int reg,
bbd51b1f HZ	71	unsigned char mask, unsigned char data)
bbd51b1f HZ	72	{
53dbab7a	73	struct pm860x_chip *chip = i2c_get_clientdata(i2c);
b46a36c0 JZ	74	struct regmap *map = (i2c == chip->client) ? chip->regmap
b46a36c0 JZ	75	: chip->regmap_companion;
bbd51b1f HZ	76	int ret;
bbd51b1f HZ	77
b46a36c0	78	ret = regmap_update_bits(map, reg, mask, data);
bbd51b1f HZ	79	return ret;
bbd51b1f HZ	80	}
53dbab7a	81	EXPORT_SYMBOL(pm860x_set_bits);
bbd51b1f	82
5bdf7411 JZ	83	static int read_device(struct i2c_client *i2c, int reg,
	84	int bytes, void *dest)
	85	{
	86	unsigned char msgbuf0[I2C_SMBUS_BLOCK_MAX + 3];
	87	unsigned char msgbuf1[I2C_SMBUS_BLOCK_MAX + 2];
	88	struct i2c_adapter *adap = i2c->adapter;
48942222 S	89	struct i2c_msg msg[2] = {
	90	{
	91	.addr = i2c->addr,
	92	.flags = 0,
	93	.len = 1,
	94	.buf = msgbuf0
	95	},
	96	{ .addr = i2c->addr,
	97	.flags = I2C_M_RD,
	98	.len = 0,
	99	.buf = msgbuf1
	100	},
5bdf7411 JZ	101	};
	102	int num = 1, ret = 0;
	103
	104	if (dest == NULL)
	105	return -EINVAL;
	106	msgbuf0[0] = (unsigned char)reg; /* command */
	107	msg[1].len = bytes;
	108
	109	/* if data needs to read back, num should be 2 */
	110	if (bytes > 0)
	111	num = 2;
	112	ret = adap->algo->master_xfer(adap, msg, num);
	113	memcpy(dest, msgbuf1, bytes);
	114	if (ret < 0)
	115	return ret;
	116	return 0;
	117	}
	118
	119	static int write_device(struct i2c_client *i2c, int reg,
	120	int bytes, void *src)
	121	{
7a36ceb2	122	unsigned char buf[2];
5bdf7411 JZ	123	struct i2c_adapter *adap = i2c->adapter;
	124	struct i2c_msg msg;
	125	int ret;
	126
	127	buf[0] = (unsigned char)reg;
	128	memcpy(&buf[1], src, bytes);
	129	msg.addr = i2c->addr;
	130	msg.flags = 0;
	131	msg.len = bytes + 1;
	132	msg.buf = buf;
	133
	134	ret = adap->algo->master_xfer(adap, &msg, 1);
	135	if (ret < 0)
	136	return ret;
	137	return 0;
	138	}
	139
09b03419 HZ	140	int pm860x_page_reg_write(struct i2c_client *i2c, int reg,
	141	unsigned char data)
	142	{
09b03419 HZ	143	unsigned char zero;
	144	int ret;
	145
8c8f74f3	146	i2c_lock_bus(i2c->adapter, I2C_LOCK_SEGMENT);
5bdf7411 JZ	147	read_device(i2c, 0xFA, 0, &zero);
	148	read_device(i2c, 0xFB, 0, &zero);
	149	read_device(i2c, 0xFF, 0, &zero);
	150	ret = write_device(i2c, reg, 1, &data);
	151	read_device(i2c, 0xFE, 0, &zero);
	152	read_device(i2c, 0xFC, 0, &zero);
8c8f74f3	153	i2c_unlock_bus(i2c->adapter, I2C_LOCK_SEGMENT);
09b03419 HZ	154	return ret;
	155	}
	156	EXPORT_SYMBOL(pm860x_page_reg_write);
	157
	158	int pm860x_page_bulk_read(struct i2c_client *i2c, int reg,
	159	int count, unsigned char *buf)
	160	{
09b03419 HZ	161	unsigned char zero = 0;
	162	int ret;
	163
8c8f74f3	164	i2c_lock_bus(i2c->adapter, I2C_LOCK_SEGMENT);
5bdf7411 JZ	165	read_device(i2c, 0xfa, 0, &zero);
	166	read_device(i2c, 0xfb, 0, &zero);
	167	read_device(i2c, 0xff, 0, &zero);
	168	ret = read_device(i2c, reg, count, buf);
	169	read_device(i2c, 0xFE, 0, &zero);
	170	read_device(i2c, 0xFC, 0, &zero);
8c8f74f3	171	i2c_unlock_bus(i2c->adapter, I2C_LOCK_SEGMENT);
09b03419 HZ	172	return ret;
	173	}
	174	EXPORT_SYMBOL(pm860x_page_bulk_read);