drivers/gpu/drm/bridge/dw-hdmi-i2s-audio.c

   1 /*
   2  * dw-hdmi-i2s-audio.c
   3  *
   4  * Copyright (c) 2016 Kuninori Morimoto <kuninori.morimoto.gx@renesas.com>
   5  *
   6  * This program is free software; you can redistribute it and/or modify
   7  * it under the terms of the GNU General Public License version 2 as
   8  * published by the Free Software Foundation.
   9  */
  10 #include <drm/bridge/dw_hdmi.h>
  11
  12 #include <sound/hdmi-codec.h>
  13
  14 #include "dw-hdmi.h"
  15 #include "dw-hdmi-audio.h"
  16
  17 #define DRIVER_NAME "dw-hdmi-i2s-audio"
  18
  19 static inline void hdmi_write(struct dw_hdmi_i2s_audio_data *audio,
  20                               u8 val, int offset)
  21 {
  22         struct dw_hdmi *hdmi = audio->hdmi;
  23
  24         audio->write(hdmi, val, offset);
  25 }
  26
  27 static inline u8 hdmi_read(struct dw_hdmi_i2s_audio_data *audio, int offset)
  28 {
  29         struct dw_hdmi *hdmi = audio->hdmi;
  30
  31         return audio->read(hdmi, offset);
  32 }
  33
  34 static int dw_hdmi_i2s_hw_params(struct device *dev, void *data,
  35                                  struct hdmi_codec_daifmt *fmt,
  36                                  struct hdmi_codec_params *hparms)
  37 {
  38         struct dw_hdmi_i2s_audio_data *audio = data;
  39         struct dw_hdmi *hdmi = audio->hdmi;
  40         u8 conf0 = 0;
  41         u8 conf1 = 0;
  42         u8 inputclkfs = 0;
  43
  44         /* it cares I2S only */
  45         if ((fmt->fmt != HDMI_I2S) ||
  46             (fmt->bit_clk_master | fmt->frame_clk_master)) {
  47                 dev_err(dev, "unsupported format/settings\n");
  48                 return -EINVAL;
  49         }
  50
  51         inputclkfs      = HDMI_AUD_INPUTCLKFS_64FS;
  52         conf0           = HDMI_AUD_CONF0_I2S_ALL_ENABLE;
  53
  54         switch (hparms->sample_width) {
  55         case 16:
  56                 conf1 = HDMI_AUD_CONF1_WIDTH_16;
  57                 break;
  58         case 24:
  59         case 32:
  60                 conf1 = HDMI_AUD_CONF1_WIDTH_24;
  61                 break;
  62         }
  63
  64         dw_hdmi_set_sample_rate(hdmi, hparms->sample_rate);
  65
  66         hdmi_write(audio, inputclkfs, HDMI_AUD_INPUTCLKFS);
  67         hdmi_write(audio, conf0, HDMI_AUD_CONF0);
  68         hdmi_write(audio, conf1, HDMI_AUD_CONF1);
  69
  70         dw_hdmi_audio_enable(hdmi);
  71
  72         return 0;
  73 }
  74
  75 static void dw_hdmi_i2s_audio_shutdown(struct device *dev, void *data)
  76 {
  77         struct dw_hdmi_i2s_audio_data *audio = data;
  78         struct dw_hdmi *hdmi = audio->hdmi;
  79
  80         dw_hdmi_audio_disable(hdmi);
  81
  82         hdmi_write(audio, HDMI_AUD_CONF0_SW_RESET, HDMI_AUD_CONF0);
  83 }
  84
  85 static struct hdmi_codec_ops dw_hdmi_i2s_ops = {
  86         .hw_params      = dw_hdmi_i2s_hw_params,
  87         .audio_shutdown = dw_hdmi_i2s_audio_shutdown,
  88 };
  89
  90 static int snd_dw_hdmi_probe(struct platform_device *pdev)
  91 {
  92         struct dw_hdmi_i2s_audio_data *audio = pdev->dev.platform_data;
  93         struct platform_device_info pdevinfo;
  94         struct hdmi_codec_pdata pdata;
  95         struct platform_device *platform;
  96
  97         pdata.ops               = &dw_hdmi_i2s_ops;
  98         pdata.i2s               = 1;
  99         pdata.max_i2s_channels  = 6;
 100         pdata.data              = audio;
 101
 102         memset(&pdevinfo, 0, sizeof(pdevinfo));
 103         pdevinfo.parent         = pdev->dev.parent;
 104         pdevinfo.id             = PLATFORM_DEVID_AUTO;
 105         pdevinfo.name           = HDMI_CODEC_DRV_NAME;
 106         pdevinfo.data           = &pdata;
 107         pdevinfo.size_data      = sizeof(pdata);
 108         pdevinfo.dma_mask       = DMA_BIT_MASK(32);
 109
 110         platform = platform_device_register_full(&pdevinfo);
 111         if (IS_ERR(platform))
 112                 return PTR_ERR(platform);
 113
 114         dev_set_drvdata(&pdev->dev, platform);
 115
 116         return 0;
 117 }
 118
 119 static int snd_dw_hdmi_remove(struct platform_device *pdev)
 120 {
 121         struct platform_device *platform = dev_get_drvdata(&pdev->dev);
 122
 123         platform_device_unregister(platform);
 124
 125         return 0;
 126 }
 127
 128 static struct platform_driver snd_dw_hdmi_driver = {
 129         .probe  = snd_dw_hdmi_probe,
 130         .remove = snd_dw_hdmi_remove,
 131         .driver = {
 132                 .name = DRIVER_NAME,
 133                 .owner = THIS_MODULE,
 134         },
 135 };
 136 module_platform_driver(snd_dw_hdmi_driver);
 137
 138 MODULE_AUTHOR("Kuninori Morimoto <kuninori.morimoto.gx@renesas.com>");
 139 MODULE_DESCRIPTION("Synopsis Designware HDMI I2S ALSA SoC interface");
 140 MODULE_LICENSE("GPL v2");
 141 MODULE_ALIAS("platform:" DRIVER_NAME);