1// SPDX-License-Identifier: GPL-2.0-only
  2/*
  3 * rl6347a.c - RL6347A class device shared support
  4 *
  5 * Copyright 2015 Realtek Semiconductor Corp.
  6 *
  7 * Author: Oder Chiou <oder_chiou@realtek.com>
  8 */
  9
 10#include <linux/module.h>
 11#include <linux/i2c.h>
 12#include <linux/regmap.h>
 13
 14#include "rl6347a.h"
 15
 16int rl6347a_hw_write(void *context, unsigned int reg, unsigned int value)
 17{
 18	struct i2c_client *client = context;
 19	struct rl6347a_priv *rl6347a = i2c_get_clientdata(client);
 20	u8 data[4];
 21	int ret, i;
 22
 23	/* handle index registers */
 24	if (reg <= 0xff) {
 25		rl6347a_hw_write(client, RL6347A_COEF_INDEX, reg);
 26		for (i = 0; i < rl6347a->index_cache_size; i++) {
 27			if (reg == rl6347a->index_cache[i].reg) {
 28				rl6347a->index_cache[i].def = value;
 29				break;
 30			}
 31
 32		}
 33		reg = RL6347A_PROC_COEF;
 34	}
 35
 36	data[0] = (reg >> 24) & 0xff;
 37	data[1] = (reg >> 16) & 0xff;
 38	/*
 39	 * 4 bit VID: reg should be 0
 40	 * 12 bit VID: value should be 0
 41	 * So we use an OR operator to handle it rather than use if condition.
 42	 */
 43	data[2] = ((reg >> 8) & 0xff) | ((value >> 8) & 0xff);
 44	data[3] = value & 0xff;
 45
 46	ret = i2c_master_send(client, data, 4);
 47
 48	if (ret == 4)
 49		return 0;
 50	else
 51		dev_err(&client->dev, "I2C error %d\n", ret);
 52	if (ret < 0)
 53		return ret;
 54	else
 55		return -EIO;
 56}
 57EXPORT_SYMBOL_GPL(rl6347a_hw_write);
 58
 59int rl6347a_hw_read(void *context, unsigned int reg, unsigned int *value)
 60{
 61	struct i2c_client *client = context;
 62	struct i2c_msg xfer[2];
 63	int ret;
 64	__be32 be_reg, buf = 0x0;
 65	unsigned int index, vid;
 66
 67	/* handle index registers */
 68	if (reg <= 0xff) {
 69		rl6347a_hw_write(client, RL6347A_COEF_INDEX, reg);
 70		reg = RL6347A_PROC_COEF;
 71	}
 72
 73	reg = reg | 0x80000;
 74	vid = (reg >> 8) & 0xfff;
 75
 76	if (AC_VERB_GET_AMP_GAIN_MUTE == (vid & 0xf00)) {
 77		index = (reg >> 8) & 0xf;
 78		reg = (reg & ~0xf0f) | index;
 79	}
 80	be_reg = cpu_to_be32(reg);
 81
 82	/* Write register */
 83	xfer[0].addr = client->addr;
 84	xfer[0].flags = 0;
 85	xfer[0].len = 4;
 86	xfer[0].buf = (u8 *)&be_reg;
 87
 88	/* Read data */
 89	xfer[1].addr = client->addr;
 90	xfer[1].flags = I2C_M_RD;
 91	xfer[1].len = 4;
 92	xfer[1].buf = (u8 *)&buf;
 93
 94	ret = i2c_transfer(client->adapter, xfer, 2);
 95	if (ret < 0)
 96		return ret;
 97	else if (ret != 2)
 98		return -EIO;
 99
100	*value = be32_to_cpu(buf);
101
102	return 0;
103}
104EXPORT_SYMBOL_GPL(rl6347a_hw_read);
105
106MODULE_DESCRIPTION("RL6347A class device shared support");
107MODULE_AUTHOR("Oder Chiou <oder_chiou@realtek.com>");
108MODULE_LICENSE("GPL v2");