kernel/sound/soc/sirf/sirf-audio-port.c

   1 /*
   2  * SiRF Audio port driver
   3  *
   4  * Copyright (c) 2011 Cambridge Silicon Radio Limited, a CSR plc group company.
   5  *
   6  * Licensed under GPLv2 or later.
   7  */
   8 #include <linux/module.h>
   9 #include <sound/soc.h>
  10 #include <sound/dmaengine_pcm.h>
  11
  12 struct sirf_audio_port {
  13         struct regmap *regmap;
  14         struct snd_dmaengine_dai_dma_data playback_dma_data;
  15         struct snd_dmaengine_dai_dma_data capture_dma_data;
  16 };
  17
  18
  19 static int sirf_audio_port_dai_probe(struct snd_soc_dai *dai)
  20 {
  21         struct sirf_audio_port *port = snd_soc_dai_get_drvdata(dai);
  22         snd_soc_dai_init_dma_data(dai, &port->playback_dma_data,
  23                         &port->capture_dma_data);
  24         return 0;
  25 }
  26
  27 static struct snd_soc_dai_driver sirf_audio_port_dai = {
  28         .probe = sirf_audio_port_dai_probe,
  29         .name = "sirf-audio-port",
  30         .id = 0,
  31         .playback = {
  32                 .channels_min = 2,
  33                 .channels_max = 2,
  34                 .rates = SNDRV_PCM_RATE_48000,
  35                 .formats = SNDRV_PCM_FMTBIT_S16_LE,
  36         },
  37         .capture = {
  38                 .channels_min = 1,
  39                 .channels_max = 2,
  40                 .rates = SNDRV_PCM_RATE_48000,
  41                 .formats = SNDRV_PCM_FMTBIT_S16_LE,
  42         },
  43 };
  44
  45 static const struct snd_soc_component_driver sirf_audio_port_component = {
  46         .name       = "sirf-audio-port",
  47 };
  48
  49 static int sirf_audio_port_probe(struct platform_device *pdev)
  50 {
  51         int ret;
  52         struct sirf_audio_port *port;
  53
  54         port = devm_kzalloc(&pdev->dev,
  55                         sizeof(struct sirf_audio_port), GFP_KERNEL);
  56         if (!port)
  57                 return -ENOMEM;
  58
  59         ret = devm_snd_soc_register_component(&pdev->dev,
  60                         &sirf_audio_port_component, &sirf_audio_port_dai, 1);
  61         if (ret)
  62                 return ret;
  63
  64         platform_set_drvdata(pdev, port);
  65         return devm_snd_dmaengine_pcm_register(&pdev->dev, NULL, 0);
  66 }
  67
  68 static const struct of_device_id sirf_audio_port_of_match[] = {
  69         { .compatible = "sirf,audio-port", },
  70         {}
  71 };
  72 MODULE_DEVICE_TABLE(of, sirf_audio_port_of_match);
  73
  74 static struct platform_driver sirf_audio_port_driver = {
  75         .driver = {
  76                 .name = "sirf-audio-port",
  77                 .of_match_table = sirf_audio_port_of_match,
  78         },
  79         .probe = sirf_audio_port_probe,
  80 };
  81
  82 module_platform_driver(sirf_audio_port_driver);
  83
  84 MODULE_DESCRIPTION("SiRF Audio Port driver");
  85 MODULE_AUTHOR("RongJun Ying <Rongjun.Ying@csr.com>");
  86 MODULE_LICENSE("GPL v2");