// SPDX-License-Identifier: GPL-2.0-only
/*
 * rl6347a.c - RL6347A class device shared support
 *
 * Copyright 2015 Realtek Semiconductor Corp.
 *
 * Author: Oder Chiou <oder_chiou@realtek.com>
 */

#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, buf = 0x0;
        unsigned int index, vid;

        /* 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");