sound/soc/codecs/rl6347a.c

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