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/*
* rl6347a.c - RL6347A class device shared support
*
* Copyright 2015 Realtek Semiconductor Corp.
*
* Author: Oder Chiou <oder_chiou@realtek.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/module.h>
#include <linux/i2c.h>
#include <linux/regmap.h>
#include "rl6347a.h"
int rl6347a_hw_write(void *context, unsigned int reg, unsigned int value)
{
struct i2c_client *client = context;
struct rl6347a_priv *rl6347a = i2c_get_clientdata(client);
u8 data[4];
int ret, i;
/* handle index registers */
if (reg <= 0xff) {
rl6347a_hw_write(client, RL6347A_COEF_INDEX, reg);
for (i = 0; i < rl6347a->index_cache_size; i++) {
if (reg == rl6347a->index_cache[i].reg) {
rl6347a->index_cache[i].def = value;
break;
}
}
reg = RL6347A_PROC_COEF;
}
data[0] = (reg >> 24) & 0xff;
data[1] = (reg >> 16) & 0xff;
/*
* 4 bit VID: reg should be 0
* 12 bit VID: value should be 0
* So we use an OR operator to handle it rather than use if condition.
*/
data[2] = ((reg >> 8) & 0xff) | ((value >> 8) & 0xff);
data[3] = value & 0xff;
ret = i2c_master_send(client, data, 4);
if (ret == 4)
return 0;
else
dev_err(&client->dev, "I2C error %d\n", ret);
if (ret < 0)
return ret;
else
return -EIO;
}
EXPORT_SYMBOL_GPL(rl6347a_hw_write);
int rl6347a_hw_read(void *context, unsigned int reg, unsigned int *value)
{
struct i2c_client *client = context;
struct i2c_msg xfer[2];
int ret;
__be32 be_reg;
unsigned int index, vid, buf = 0x0;
/* handle index registers */
if (reg <= 0xff) {
rl6347a_hw_write(client, RL6347A_COEF_INDEX, reg);
reg = RL6347A_PROC_COEF;
}
reg = reg | 0x80000;
vid = (reg >> 8) & 0xfff;
if (AC_VERB_GET_AMP_GAIN_MUTE == (vid & 0xf00)) {
index = (reg >> 8) & 0xf;
reg = (reg & ~0xf0f) | index;
}
be_reg = cpu_to_be32(reg);
/* Write register */
xfer[0].addr = client->addr;
xfer[0].flags = 0;
xfer[0].len = 4;
xfer[0].buf = (u8 *)&be_reg;
/* Read data */
xfer[1].addr = client->addr;
xfer[1].flags = I2C_M_RD;
xfer[1].len = 4;
xfer[1].buf = (u8 *)&buf;
ret = i2c_transfer(client->adapter, xfer, 2);
if (ret < 0)
return ret;
else if (ret != 2)
return -EIO;
*value = be32_to_cpu(buf);
return 0;
}
EXPORT_SYMBOL_GPL(rl6347a_hw_read);
MODULE_DESCRIPTION("RL6347A class device shared support");
MODULE_AUTHOR("Oder Chiou <oder_chiou@realtek.com>");
MODULE_LICENSE("GPL v2");
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