88pm860x-i2c.c

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/*
 * I2C driver for Marvell 88PM860x
 *
 * Copyright (C) 2009 Marvell International Ltd.
 *  Haojian Zhuang <[email protected]>
 *
 * 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[bytes + 1];
    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_read(struct i2c_client *i2c, int reg)
{
    unsigned char zero = 0;
    unsigned char data;
    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, 1, &data);
    if (ret >= 0)
        ret = (int)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_read);

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);

int pm860x_page_bulk_write(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 = write_device(i2c, reg, count, buf);
    read_device(i2c, 0xFE, 0, &zero);
    read_device(i2c, 0xFC, 0, &zero);
    i2c_unlock_adapter(i2c->adapter);
    i2c_unlock_adapter(i2c->adapter);
    return ret;
}
EXPORT_SYMBOL(pm860x_page_bulk_write);

int pm860x_page_set_bits(struct i2c_client *i2c, int reg,
             unsigned char mask, unsigned char data)
{
    unsigned char zero;
    unsigned char value;
    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, 1, &value);
    if (ret < 0)
        goto out;
    value &= ~mask;
    value |= data;
    ret = write_device(i2c, reg, 1, &value);
out:
    read_device(i2c, 0xFE, 0, &zero);
    read_device(i2c, 0xFC, 0, &zero);
    i2c_unlock_adapter(i2c->adapter);
    return ret;
}
EXPORT_SYMBOL(pm860x_page_set_bits);