sound/soc/codecs/wm1250-ev1.c

   1 /*
   2  * Driver for the 1250-EV1 audio I/O module
   3  *
   4  * Copyright 2011 Wolfson Microelectronics plc
   5  *
   6  *  This program is free software; you can redistribute  it and/or modify it
   7  *  under  the terms of  the GNU General  Public License as published by the
   8  *  Free Software Foundation;  either version 2 of the  License, or (at your
   9  *  option) any later version.
  10  *
  11  */
  12
  13 #include <linux/init.h>
  14 #include <linux/module.h>
  15 #include <linux/i2c.h>
  16
  17 #include <sound/soc.h>
  18 #include <sound/soc-dapm.h>
  19
  20 static const struct snd_soc_dapm_widget wm1250_ev1_dapm_widgets[] = {
  21 SND_SOC_DAPM_ADC("ADC", "wm1250-ev1 Capture", SND_SOC_NOPM, 0, 0),
  22 SND_SOC_DAPM_DAC("DAC", "wm1250-ev1 Playback", SND_SOC_NOPM, 0, 0),
  23
  24 SND_SOC_DAPM_INPUT("WM1250 Input"),
  25 SND_SOC_DAPM_OUTPUT("WM1250 Output"),
  26 };
  27
  28 static const struct snd_soc_dapm_route wm1250_ev1_dapm_routes[] = {
  29         { "ADC", NULL, "WM1250 Input" },
  30         { "WM1250 Output", NULL, "DAC" },
  31 };
  32
  33 static struct snd_soc_dai_driver wm1250_ev1_dai = {
  34         .name = "wm1250-ev1",
  35         .playback = {
  36                 .stream_name = "Playback",
  37                 .channels_min = 1,
  38                 .channels_max = 1,
  39                 .rates = SNDRV_PCM_RATE_8000,
  40                 .formats = SNDRV_PCM_FMTBIT_S16_LE,
  41         },
  42         .capture = {
  43                 .stream_name = "Capture",
  44                 .channels_min = 1,
  45                 .channels_max = 1,
  46                 .rates = SNDRV_PCM_RATE_8000,
  47                 .formats = SNDRV_PCM_FMTBIT_S16_LE,
  48         },
  49 };
  50
  51 static struct snd_soc_codec_driver soc_codec_dev_wm1250_ev1 = {
  52         .dapm_widgets = wm1250_ev1_dapm_widgets,
  53         .num_dapm_widgets = ARRAY_SIZE(wm1250_ev1_dapm_widgets),
  54         .dapm_routes = wm1250_ev1_dapm_routes,
  55         .num_dapm_routes = ARRAY_SIZE(wm1250_ev1_dapm_routes),
  56 };
  57
  58 static int __devinit wm1250_ev1_probe(struct i2c_client *i2c,
  59                                       const struct i2c_device_id *i2c_id)
  60 {
  61         int id, board, rev;
  62
  63         board = i2c_smbus_read_byte_data(i2c, 0);
  64         if (board < 0) {
  65                 dev_err(&i2c->dev, "Failed to read ID: %d\n", board);
  66                 return board;
  67         }
  68
  69         id = (board & 0xfe) >> 2;
  70         rev = board & 0x3;
  71
  72         if (id != 1) {
  73                 dev_err(&i2c->dev, "Unknown board ID %d\n", id);
  74                 return -ENODEV;
  75         }
  76
  77         dev_info(&i2c->dev, "revision %d\n", rev + 1);
  78
  79         return snd_soc_register_codec(&i2c->dev, &soc_codec_dev_wm1250_ev1,
  80                                       &wm1250_ev1_dai, 1);
  81 }
  82
  83 static int __devexit wm1250_ev1_remove(struct i2c_client *i2c)
  84 {
  85         snd_soc_unregister_codec(&i2c->dev);
  86
  87         return 0;
  88 }
  89
  90 static const struct i2c_device_id wm1250_ev1_i2c_id[] = {
  91         { "wm1250-ev1", 0 },
  92         { }
  93 };
  94 MODULE_DEVICE_TABLE(i2c, wm1250_ev1_i2c_id);
  95
  96 static struct i2c_driver wm1250_ev1_i2c_driver = {
  97         .driver = {
  98                 .name = "wm1250-ev1",
  99                 .owner = THIS_MODULE,
 100         },
 101         .probe =    wm1250_ev1_probe,
 102         .remove =   __devexit_p(wm1250_ev1_remove),
 103         .id_table = wm1250_ev1_i2c_id,
 104 };
 105
 106 static int __init wm1250_ev1_modinit(void)
 107 {
 108         int ret = 0;
 109
 110         ret = i2c_add_driver(&wm1250_ev1_i2c_driver);
 111         if (ret != 0)
 112                 pr_err("Failed to register WM1250-EV1 I2C driver: %d\n", ret);
 113
 114         return ret;
 115 }
 116 module_init(wm1250_ev1_modinit);
 117
 118 static void __exit wm1250_ev1_exit(void)
 119 {
 120         i2c_del_driver(&wm1250_ev1_i2c_driver);
 121 }
 122 module_exit(wm1250_ev1_exit);
 123
 124 MODULE_AUTHOR("Mark Brown <broonie@opensource.wolfsonmicro.com>");
 125 MODULE_DESCRIPTION("WM1250-EV1 audio I/O module driver");
 126 MODULE_LICENSE("GPL");