sound/soc/codecs/rl6347a.c

   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
  16 int 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 }
  57 EXPORT_SYMBOL_GPL(rl6347a_hw_write);
  58
  59 int 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 }
 104 EXPORT_SYMBOL_GPL(rl6347a_hw_read);
 105
 106 MODULE_DESCRIPTION("RL6347A class device shared support");
 107 MODULE_AUTHOR("Oder Chiou <oder_chiou@realtek.com>");
 108 MODULE_LICENSE("GPL v2");