drivers/gpu/drm/bridge/synopsys/dw-hdmi-gp-audio.c

   1 // SPDX-License-Identifier: (GPL-2.0+ OR MIT)
   2 /*
   3  * dw-hdmi-gp-audio.c
   4  *
   5  * Copyright 2020-2022 NXP
   6  */
   7 #include <linux/io.h>
   8 #include <linux/interrupt.h>
   9 #include <linux/module.h>
  10 #include <linux/platform_device.h>
  11 #include <linux/dmaengine.h>
  12 #include <linux/dma-mapping.h>
  13 #include <drm/bridge/dw_hdmi.h>
  14 #include <drm/drm_edid.h>
  15 #include <drm/drm_connector.h>
  16
  17 #include <sound/hdmi-codec.h>
  18 #include <sound/asoundef.h>
  19 #include <sound/core.h>
  20 #include <sound/initval.h>
  21 #include <sound/pcm.h>
  22 #include <sound/pcm_drm_eld.h>
  23 #include <sound/pcm_iec958.h>
  24 #include <sound/dmaengine_pcm.h>
  25
  26 #include "dw-hdmi-audio.h"
  27
  28 #define DRIVER_NAME "dw-hdmi-gp-audio"
  29 #define DRV_NAME    "hdmi-gp-audio"
  30
  31 struct snd_dw_hdmi {
  32         struct dw_hdmi_audio_data data;
  33         struct platform_device  *audio_pdev;
  34         unsigned int pos;
  35 };
  36
  37 struct dw_hdmi_channel_conf {
  38         u8 conf1;
  39         u8 ca;
  40 };
  41
  42 /*
  43  * The default mapping of ALSA channels to HDMI channels and speaker
  44  * allocation bits.  Note that we can't do channel remapping here -
  45  * channels must be in the same order.
  46  *
  47  * Mappings for alsa-lib pcm/surround*.conf files:
  48  *
  49  *              Front   Sur4.0  Sur4.1  Sur5.0  Sur5.1  Sur7.1
  50  * Channels     2       4       6       6       6       8
  51  *
  52  * Our mapping from ALSA channel to CEA686D speaker name and HDMI channel:
  53  *
  54  *                              Number of ALSA channels
  55  * ALSA Channel 2       3       4       5       6       7       8
  56  * 0            FL:0    =       =       =       =       =       =
  57  * 1            FR:1    =       =       =       =       =       =
  58  * 2                    FC:3    RL:4    LFE:2   =       =       =
  59  * 3                            RR:5    RL:4    FC:3    =       =
  60  * 4                                    RR:5    RL:4    =       =
  61  * 5                                            RR:5    =       =
  62  * 6                                                    RC:6    =
  63  * 7                                                    RLC/FRC RLC/FRC
  64  */
  65 static struct dw_hdmi_channel_conf default_hdmi_channel_config[7] = {
  66         { 0x03, 0x00 }, /* FL,FR */
  67         { 0x0b, 0x02 }, /* FL,FR,FC */
  68         { 0x33, 0x08 }, /* FL,FR,RL,RR */
  69         { 0x37, 0x09 }, /* FL,FR,LFE,RL,RR */
  70         { 0x3f, 0x0b }, /* FL,FR,LFE,FC,RL,RR */
  71         { 0x7f, 0x0f }, /* FL,FR,LFE,FC,RL,RR,RC */
  72         { 0xff, 0x13 }, /* FL,FR,LFE,FC,RL,RR,[FR]RC,[FR]LC */
  73 };
  74
  75 static int audio_hw_params(struct device *dev,  void *data,
  76                            struct hdmi_codec_daifmt *daifmt,
  77                            struct hdmi_codec_params *params)
  78 {
  79         struct snd_dw_hdmi *dw = dev_get_drvdata(dev);
  80         u8 ca;
  81
  82         dw_hdmi_set_sample_rate(dw->data.hdmi, params->sample_rate);
  83
  84         ca = default_hdmi_channel_config[params->channels - 2].ca;
  85
  86         dw_hdmi_set_channel_count(dw->data.hdmi, params->channels);
  87         dw_hdmi_set_channel_allocation(dw->data.hdmi, ca);
  88
  89         dw_hdmi_set_sample_non_pcm(dw->data.hdmi,
  90                                    params->iec.status[0] & IEC958_AES0_NONAUDIO);
  91         dw_hdmi_set_sample_width(dw->data.hdmi, params->sample_width);
  92
  93         return 0;
  94 }
  95
  96 static void audio_shutdown(struct device *dev, void *data)
  97 {
  98 }
  99
 100 static int audio_mute_stream(struct device *dev, void *data,
 101                              bool enable, int direction)
 102 {
 103         struct snd_dw_hdmi *dw = dev_get_drvdata(dev);
 104
 105         if (!enable)
 106                 dw_hdmi_audio_enable(dw->data.hdmi);
 107         else
 108                 dw_hdmi_audio_disable(dw->data.hdmi);
 109
 110         return 0;
 111 }
 112
 113 static int audio_get_eld(struct device *dev, void *data,
 114                          u8 *buf, size_t len)
 115 {
 116         struct dw_hdmi_audio_data *audio = data;
 117         u8 *eld;
 118
 119         eld = audio->get_eld(audio->hdmi);
 120         if (eld)
 121                 memcpy(buf, eld, min_t(size_t, MAX_ELD_BYTES, len));
 122         else
 123                 /* Pass en empty ELD if connector not available */
 124                 memset(buf, 0, len);
 125
 126         return 0;
 127 }
 128
 129 static int audio_hook_plugged_cb(struct device *dev, void *data,
 130                                  hdmi_codec_plugged_cb fn,
 131                                  struct device *codec_dev)
 132 {
 133         struct snd_dw_hdmi *dw = dev_get_drvdata(dev);
 134
 135         return dw_hdmi_set_plugged_cb(dw->data.hdmi, fn, codec_dev);
 136 }
 137
 138 static const struct hdmi_codec_ops audio_codec_ops = {
 139         .hw_params = audio_hw_params,
 140         .audio_shutdown = audio_shutdown,
 141         .mute_stream = audio_mute_stream,
 142         .get_eld = audio_get_eld,
 143         .hook_plugged_cb = audio_hook_plugged_cb,
 144 };
 145
 146 static int snd_dw_hdmi_probe(struct platform_device *pdev)
 147 {
 148         struct dw_hdmi_audio_data *data = pdev->dev.platform_data;
 149         struct snd_dw_hdmi *dw;
 150
 151         const struct hdmi_codec_pdata codec_data = {
 152                 .i2s = 1,
 153                 .spdif = 0,
 154                 .ops = &audio_codec_ops,
 155                 .max_i2s_channels = 8,
 156                 .data = data,
 157         };
 158
 159         dw = devm_kzalloc(&pdev->dev, sizeof(*dw), GFP_KERNEL);
 160         if (!dw)
 161                 return -ENOMEM;
 162
 163         dw->data = *data;
 164
 165         platform_set_drvdata(pdev, dw);
 166
 167         dw->audio_pdev = platform_device_register_data(&pdev->dev,
 168                                                        HDMI_CODEC_DRV_NAME, 1,
 169                                                        &codec_data,
 170                                                        sizeof(codec_data));
 171
 172         return PTR_ERR_OR_ZERO(dw->audio_pdev);
 173 }
 174
 175 static int snd_dw_hdmi_remove(struct platform_device *pdev)
 176 {
 177         struct snd_dw_hdmi *dw = platform_get_drvdata(pdev);
 178
 179         platform_device_unregister(dw->audio_pdev);
 180
 181         return 0;
 182 }
 183
 184 static struct platform_driver snd_dw_hdmi_driver = {
 185         .probe  = snd_dw_hdmi_probe,
 186         .remove = snd_dw_hdmi_remove,
 187         .driver = {
 188                 .name = DRIVER_NAME,
 189         },
 190 };
 191
 192 module_platform_driver(snd_dw_hdmi_driver);
 193
 194 MODULE_AUTHOR("Shengjiu Wang <shengjiu.wang@nxp.com>");
 195 MODULE_DESCRIPTION("Synopsys Designware HDMI GPA ALSA interface");
 196 MODULE_LICENSE("GPL");
 197 MODULE_ALIAS("platform:" DRIVER_NAME);