mirror of https://gitee.com/openkylin/linux.git
112 lines
2.5 KiB
C
112 lines
2.5 KiB
C
/*
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* rl6347a.c - RL6347A class device shared support
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*
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* Copyright 2015 Realtek Semiconductor Corp.
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*
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* Author: Oder Chiou <oder_chiou@realtek.com>
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*
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* This program is free software; you can redistribute it and/or modify
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* it under the terms of the GNU General Public License version 2 as
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* published by the Free Software Foundation.
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*/
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#include <linux/module.h>
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#include <linux/i2c.h>
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#include <linux/regmap.h>
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#include "rl6347a.h"
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int rl6347a_hw_write(void *context, unsigned int reg, unsigned int value)
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{
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struct i2c_client *client = context;
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struct rl6347a_priv *rl6347a = i2c_get_clientdata(client);
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u8 data[4];
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int ret, i;
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/* handle index registers */
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if (reg <= 0xff) {
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rl6347a_hw_write(client, RL6347A_COEF_INDEX, reg);
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for (i = 0; i < rl6347a->index_cache_size; i++) {
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if (reg == rl6347a->index_cache[i].reg) {
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rl6347a->index_cache[i].def = value;
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break;
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}
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}
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reg = RL6347A_PROC_COEF;
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}
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data[0] = (reg >> 24) & 0xff;
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data[1] = (reg >> 16) & 0xff;
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/*
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* 4 bit VID: reg should be 0
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* 12 bit VID: value should be 0
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* So we use an OR operator to handle it rather than use if condition.
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*/
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data[2] = ((reg >> 8) & 0xff) | ((value >> 8) & 0xff);
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data[3] = value & 0xff;
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ret = i2c_master_send(client, data, 4);
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if (ret == 4)
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return 0;
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else
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dev_err(&client->dev, "I2C error %d\n", ret);
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if (ret < 0)
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return ret;
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else
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return -EIO;
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}
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EXPORT_SYMBOL_GPL(rl6347a_hw_write);
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int rl6347a_hw_read(void *context, unsigned int reg, unsigned int *value)
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{
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struct i2c_client *client = context;
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struct i2c_msg xfer[2];
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int ret;
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__be32 be_reg, buf = 0x0;
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unsigned int index, vid;
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/* handle index registers */
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if (reg <= 0xff) {
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rl6347a_hw_write(client, RL6347A_COEF_INDEX, reg);
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reg = RL6347A_PROC_COEF;
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}
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reg = reg | 0x80000;
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vid = (reg >> 8) & 0xfff;
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if (AC_VERB_GET_AMP_GAIN_MUTE == (vid & 0xf00)) {
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index = (reg >> 8) & 0xf;
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reg = (reg & ~0xf0f) | index;
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}
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be_reg = cpu_to_be32(reg);
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/* Write register */
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xfer[0].addr = client->addr;
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xfer[0].flags = 0;
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xfer[0].len = 4;
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xfer[0].buf = (u8 *)&be_reg;
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/* Read data */
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xfer[1].addr = client->addr;
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xfer[1].flags = I2C_M_RD;
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xfer[1].len = 4;
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xfer[1].buf = (u8 *)&buf;
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ret = i2c_transfer(client->adapter, xfer, 2);
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if (ret < 0)
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return ret;
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else if (ret != 2)
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return -EIO;
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*value = be32_to_cpu(buf);
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return 0;
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}
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EXPORT_SYMBOL_GPL(rl6347a_hw_read);
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MODULE_DESCRIPTION("RL6347A class device shared support");
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MODULE_AUTHOR("Oder Chiou <oder_chiou@realtek.com>");
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MODULE_LICENSE("GPL v2");
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