sound/virtio/virtio_chmap.c

   1 // SPDX-License-Identifier: GPL-2.0+
   2 /*
   3  * virtio-snd: Virtio sound device
   4  * Copyright (C) 2021 OpenSynergy GmbH
   5  */
   6 #include <linux/virtio_config.h>
   7
   8 #include "virtio_card.h"
   9
  10 /* VirtIO->ALSA channel position map */
  11 static const u8 g_v2a_position_map[] = {
  12         [VIRTIO_SND_CHMAP_NONE] = SNDRV_CHMAP_UNKNOWN,
  13         [VIRTIO_SND_CHMAP_NA] = SNDRV_CHMAP_NA,
  14         [VIRTIO_SND_CHMAP_MONO] = SNDRV_CHMAP_MONO,
  15         [VIRTIO_SND_CHMAP_FL] = SNDRV_CHMAP_FL,
  16         [VIRTIO_SND_CHMAP_FR] = SNDRV_CHMAP_FR,
  17         [VIRTIO_SND_CHMAP_RL] = SNDRV_CHMAP_RL,
  18         [VIRTIO_SND_CHMAP_RR] = SNDRV_CHMAP_RR,
  19         [VIRTIO_SND_CHMAP_FC] = SNDRV_CHMAP_FC,
  20         [VIRTIO_SND_CHMAP_LFE] = SNDRV_CHMAP_LFE,
  21         [VIRTIO_SND_CHMAP_SL] = SNDRV_CHMAP_SL,
  22         [VIRTIO_SND_CHMAP_SR] = SNDRV_CHMAP_SR,
  23         [VIRTIO_SND_CHMAP_RC] = SNDRV_CHMAP_RC,
  24         [VIRTIO_SND_CHMAP_FLC] = SNDRV_CHMAP_FLC,
  25         [VIRTIO_SND_CHMAP_FRC] = SNDRV_CHMAP_FRC,
  26         [VIRTIO_SND_CHMAP_RLC] = SNDRV_CHMAP_RLC,
  27         [VIRTIO_SND_CHMAP_RRC] = SNDRV_CHMAP_RRC,
  28         [VIRTIO_SND_CHMAP_FLW] = SNDRV_CHMAP_FLW,
  29         [VIRTIO_SND_CHMAP_FRW] = SNDRV_CHMAP_FRW,
  30         [VIRTIO_SND_CHMAP_FLH] = SNDRV_CHMAP_FLH,
  31         [VIRTIO_SND_CHMAP_FCH] = SNDRV_CHMAP_FCH,
  32         [VIRTIO_SND_CHMAP_FRH] = SNDRV_CHMAP_FRH,
  33         [VIRTIO_SND_CHMAP_TC] = SNDRV_CHMAP_TC,
  34         [VIRTIO_SND_CHMAP_TFL] = SNDRV_CHMAP_TFL,
  35         [VIRTIO_SND_CHMAP_TFR] = SNDRV_CHMAP_TFR,
  36         [VIRTIO_SND_CHMAP_TFC] = SNDRV_CHMAP_TFC,
  37         [VIRTIO_SND_CHMAP_TRL] = SNDRV_CHMAP_TRL,
  38         [VIRTIO_SND_CHMAP_TRR] = SNDRV_CHMAP_TRR,
  39         [VIRTIO_SND_CHMAP_TRC] = SNDRV_CHMAP_TRC,
  40         [VIRTIO_SND_CHMAP_TFLC] = SNDRV_CHMAP_TFLC,
  41         [VIRTIO_SND_CHMAP_TFRC] = SNDRV_CHMAP_TFRC,
  42         [VIRTIO_SND_CHMAP_TSL] = SNDRV_CHMAP_TSL,
  43         [VIRTIO_SND_CHMAP_TSR] = SNDRV_CHMAP_TSR,
  44         [VIRTIO_SND_CHMAP_LLFE] = SNDRV_CHMAP_LLFE,
  45         [VIRTIO_SND_CHMAP_RLFE] = SNDRV_CHMAP_RLFE,
  46         [VIRTIO_SND_CHMAP_BC] = SNDRV_CHMAP_BC,
  47         [VIRTIO_SND_CHMAP_BLC] = SNDRV_CHMAP_BLC,
  48         [VIRTIO_SND_CHMAP_BRC] = SNDRV_CHMAP_BRC
  49 };
  50
  51 /**
  52  * virtsnd_chmap_parse_cfg() - Parse the channel map configuration.
  53  * @snd: VirtIO sound device.
  54  *
  55  * This function is called during initial device initialization.
  56  *
  57  * Context: Any context that permits to sleep.
  58  * Return: 0 on success, -errno on failure.
  59  */
  60 int virtsnd_chmap_parse_cfg(struct virtio_snd *snd)
  61 {
  62         struct virtio_device *vdev = snd->vdev;
  63         u32 i;
  64         int rc;
  65
  66         virtio_cread_le(vdev, struct virtio_snd_config, chmaps, &snd->nchmaps);
  67         if (!snd->nchmaps)
  68                 return 0;
  69
  70         snd->chmaps = devm_kcalloc(&vdev->dev, snd->nchmaps,
  71                                    sizeof(*snd->chmaps), GFP_KERNEL);
  72         if (!snd->chmaps)
  73                 return -ENOMEM;
  74
  75         rc = virtsnd_ctl_query_info(snd, VIRTIO_SND_R_CHMAP_INFO, 0,
  76                                     snd->nchmaps, sizeof(*snd->chmaps),
  77                                     snd->chmaps);
  78         if (rc)
  79                 return rc;
  80
  81         /* Count the number of channel maps per each PCM device/stream. */
  82         for (i = 0; i < snd->nchmaps; ++i) {
  83                 struct virtio_snd_chmap_info *info = &snd->chmaps[i];
  84                 u32 nid = le32_to_cpu(info->hdr.hda_fn_nid);
  85                 struct virtio_pcm *vpcm;
  86                 struct virtio_pcm_stream *vs;
  87
  88                 vpcm = virtsnd_pcm_find_or_create(snd, nid);
  89                 if (IS_ERR(vpcm))
  90                         return PTR_ERR(vpcm);
  91
  92                 switch (info->direction) {
  93                 case VIRTIO_SND_D_OUTPUT:
  94                         vs = &vpcm->streams[SNDRV_PCM_STREAM_PLAYBACK];
  95                         break;
  96                 case VIRTIO_SND_D_INPUT:
  97                         vs = &vpcm->streams[SNDRV_PCM_STREAM_CAPTURE];
  98                         break;
  99                 default:
 100                         dev_err(&vdev->dev,
 101                                 "chmap #%u: unknown direction (%u)\n", i,
 102                                 info->direction);
 103                         return -EINVAL;
 104                 }
 105
 106                 vs->nchmaps++;
 107         }
 108
 109         return 0;
 110 }
 111
 112 /**
 113  * virtsnd_chmap_add_ctls() - Create an ALSA control for channel maps.
 114  * @pcm: ALSA PCM device.
 115  * @direction: PCM stream direction (SNDRV_PCM_STREAM_XXX).
 116  * @vs: VirtIO PCM stream.
 117  *
 118  * Context: Any context.
 119  * Return: 0 on success, -errno on failure.
 120  */
 121 static int virtsnd_chmap_add_ctls(struct snd_pcm *pcm, int direction,
 122                                   struct virtio_pcm_stream *vs)
 123 {
 124         u32 i;
 125         int max_channels = 0;
 126
 127         for (i = 0; i < vs->nchmaps; i++)
 128                 if (max_channels < vs->chmaps[i].channels)
 129                         max_channels = vs->chmaps[i].channels;
 130
 131         return snd_pcm_add_chmap_ctls(pcm, direction, vs->chmaps, max_channels,
 132                                       0, NULL);
 133 }
 134
 135 /**
 136  * virtsnd_chmap_build_devs() - Build ALSA controls for channel maps.
 137  * @snd: VirtIO sound device.
 138  *
 139  * Context: Any context.
 140  * Return: 0 on success, -errno on failure.
 141  */
 142 int virtsnd_chmap_build_devs(struct virtio_snd *snd)
 143 {
 144         struct virtio_device *vdev = snd->vdev;
 145         struct virtio_pcm *vpcm;
 146         struct virtio_pcm_stream *vs;
 147         u32 i;
 148         int rc;
 149
 150         /* Allocate channel map elements per each PCM device/stream. */
 151         list_for_each_entry(vpcm, &snd->pcm_list, list) {
 152                 for (i = 0; i < ARRAY_SIZE(vpcm->streams); ++i) {
 153                         vs = &vpcm->streams[i];
 154
 155                         if (!vs->nchmaps)
 156                                 continue;
 157
 158                         vs->chmaps = devm_kcalloc(&vdev->dev, vs->nchmaps + 1,
 159                                                   sizeof(*vs->chmaps),
 160                                                   GFP_KERNEL);
 161                         if (!vs->chmaps)
 162                                 return -ENOMEM;
 163
 164                         vs->nchmaps = 0;
 165                 }
 166         }
 167
 168         /* Initialize channel maps per each PCM device/stream. */
 169         for (i = 0; i < snd->nchmaps; ++i) {
 170                 struct virtio_snd_chmap_info *info = &snd->chmaps[i];
 171                 unsigned int channels = info->channels;
 172                 unsigned int ch;
 173                 struct snd_pcm_chmap_elem *chmap;
 174
 175                 vpcm = virtsnd_pcm_find(snd, le32_to_cpu(info->hdr.hda_fn_nid));
 176                 if (IS_ERR(vpcm))
 177                         return PTR_ERR(vpcm);
 178
 179                 if (info->direction == VIRTIO_SND_D_OUTPUT)
 180                         vs = &vpcm->streams[SNDRV_PCM_STREAM_PLAYBACK];
 181                 else
 182                         vs = &vpcm->streams[SNDRV_PCM_STREAM_CAPTURE];
 183
 184                 chmap = &vs->chmaps[vs->nchmaps++];
 185
 186                 if (channels > ARRAY_SIZE(chmap->map))
 187                         channels = ARRAY_SIZE(chmap->map);
 188
 189                 chmap->channels = channels;
 190
 191                 for (ch = 0; ch < channels; ++ch) {
 192                         u8 position = info->positions[ch];
 193
 194                         if (position >= ARRAY_SIZE(g_v2a_position_map))
 195                                 return -EINVAL;
 196
 197                         chmap->map[ch] = g_v2a_position_map[position];
 198                 }
 199         }
 200
 201         /* Create an ALSA control per each PCM device/stream. */
 202         list_for_each_entry(vpcm, &snd->pcm_list, list) {
 203                 if (!vpcm->pcm)
 204                         continue;
 205
 206                 for (i = 0; i < ARRAY_SIZE(vpcm->streams); ++i) {
 207                         vs = &vpcm->streams[i];
 208
 209                         if (!vs->nchmaps)
 210                                 continue;
 211
 212                         rc = virtsnd_chmap_add_ctls(vpcm->pcm, i, vs);
 213                         if (rc)
 214                                 return rc;
 215                 }
 216         }
 217
 218         return 0;
 219 }