// SPDX-License-Identifier: GPL-2.0+
/*
* virtio-snd: Virtio sound device
* Copyright (C) 2021 OpenSynergy GmbH
*/
#include <linux/virtio_config.h>
#include "virtio_card.h"
/* VirtIO->ALSA channel position map */
static const u8 g_v2a_position_map[] = {
[VIRTIO_SND_CHMAP_NONE] = SNDRV_CHMAP_UNKNOWN,
[VIRTIO_SND_CHMAP_NA] = SNDRV_CHMAP_NA,
[VIRTIO_SND_CHMAP_MONO] = SNDRV_CHMAP_MONO,
[VIRTIO_SND_CHMAP_FL] = SNDRV_CHMAP_FL,
[VIRTIO_SND_CHMAP_FR] = SNDRV_CHMAP_FR,
[VIRTIO_SND_CHMAP_RL] = SNDRV_CHMAP_RL,
[VIRTIO_SND_CHMAP_RR] = SNDRV_CHMAP_RR,
[VIRTIO_SND_CHMAP_FC] = SNDRV_CHMAP_FC,
[VIRTIO_SND_CHMAP_LFE] = SNDRV_CHMAP_LFE,
[VIRTIO_SND_CHMAP_SL] = SNDRV_CHMAP_SL,
[VIRTIO_SND_CHMAP_SR] = SNDRV_CHMAP_SR,
[VIRTIO_SND_CHMAP_RC] = SNDRV_CHMAP_RC,
[VIRTIO_SND_CHMAP_FLC] = SNDRV_CHMAP_FLC,
[VIRTIO_SND_CHMAP_FRC] = SNDRV_CHMAP_FRC,
[VIRTIO_SND_CHMAP_RLC] = SNDRV_CHMAP_RLC,
[VIRTIO_SND_CHMAP_RRC] = SNDRV_CHMAP_RRC,
[VIRTIO_SND_CHMAP_FLW] = SNDRV_CHMAP_FLW,
[VIRTIO_SND_CHMAP_FRW] = SNDRV_CHMAP_FRW,
[VIRTIO_SND_CHMAP_FLH] = SNDRV_CHMAP_FLH,
[VIRTIO_SND_CHMAP_FCH] = SNDRV_CHMAP_FCH,
[VIRTIO_SND_CHMAP_FRH] = SNDRV_CHMAP_FRH,
[VIRTIO_SND_CHMAP_TC] = SNDRV_CHMAP_TC,
[VIRTIO_SND_CHMAP_TFL] = SNDRV_CHMAP_TFL,
[VIRTIO_SND_CHMAP_TFR] = SNDRV_CHMAP_TFR,
[VIRTIO_SND_CHMAP_TFC] = SNDRV_CHMAP_TFC,
[VIRTIO_SND_CHMAP_TRL] = SNDRV_CHMAP_TRL,
[VIRTIO_SND_CHMAP_TRR] = SNDRV_CHMAP_TRR,
[VIRTIO_SND_CHMAP_TRC] = SNDRV_CHMAP_TRC,
[VIRTIO_SND_CHMAP_TFLC] = SNDRV_CHMAP_TFLC,
[VIRTIO_SND_CHMAP_TFRC] = SNDRV_CHMAP_TFRC,
[VIRTIO_SND_CHMAP_TSL] = SNDRV_CHMAP_TSL,
[VIRTIO_SND_CHMAP_TSR] = SNDRV_CHMAP_TSR,
[VIRTIO_SND_CHMAP_LLFE] = SNDRV_CHMAP_LLFE,
[VIRTIO_SND_CHMAP_RLFE] = SNDRV_CHMAP_RLFE,
[VIRTIO_SND_CHMAP_BC] = SNDRV_CHMAP_BC,
[VIRTIO_SND_CHMAP_BLC] = SNDRV_CHMAP_BLC,
[VIRTIO_SND_CHMAP_BRC] = SNDRV_CHMAP_BRC
};
/**
* virtsnd_chmap_parse_cfg() - Parse the channel map configuration.
* @snd: VirtIO sound device.
*
* This function is called during initial device initialization.
*
* Context: Any context that permits to sleep.
* Return: 0 on success, -errno on failure.
*/
int virtsnd_chmap_parse_cfg(struct virtio_snd *snd)
{
struct virtio_device *vdev = snd->vdev;
u32 i;
int rc;
virtio_cread_le(vdev, struct virtio_snd_config, chmaps, &snd->nchmaps);
if (!snd->nchmaps)
return 0;
snd->chmaps = devm_kcalloc(&vdev->dev, snd->nchmaps,
sizeof(*snd->chmaps), GFP_KERNEL);
if (!snd->chmaps)
return -ENOMEM;
rc = virtsnd_ctl_query_info(snd, VIRTIO_SND_R_CHMAP_INFO, 0,
snd->nchmaps, sizeof(*snd->chmaps),
snd->chmaps);
if (rc)
return rc;
/* Count the number of channel maps per each PCM device/stream. */
for (i = 0; i < snd->nchmaps; ++i) {
struct virtio_snd_chmap_info *info = &snd->chmaps[i];
u32 nid = le32_to_cpu(info->hdr.hda_fn_nid);
struct virtio_pcm *vpcm;
struct virtio_pcm_stream *vs;
vpcm = virtsnd_pcm_find_or_create(snd, nid);
if (IS_ERR(vpcm))
return PTR_ERR(vpcm);
switch (info->direction) {
case VIRTIO_SND_D_OUTPUT:
vs = &vpcm->streams[SNDRV_PCM_STREAM_PLAYBACK];
break;
case VIRTIO_SND_D_INPUT:
vs = &vpcm->streams[SNDRV_PCM_STREAM_CAPTURE];
break;
default:
dev_err(&vdev->dev,
"chmap #%u: unknown direction (%u)\n", i,
info->direction);
return -EINVAL;
}
vs->nchmaps++;
}
return 0;
}
/**
* virtsnd_chmap_add_ctls() - Create an ALSA control for channel maps.
* @pcm: ALSA PCM device.
* @direction: PCM stream direction (SNDRV_PCM_STREAM_XXX).
* @vs: VirtIO PCM stream.
*
* Context: Any context.
* Return: 0 on success, -errno on failure.
*/
static int virtsnd_chmap_add_ctls(struct snd_pcm *pcm, int direction,
struct virtio_pcm_stream *vs)
{
u32 i;
int max_channels = 0;
for (i = 0; i < vs->nchmaps; i++)
if (max_channels < vs->chmaps[i].channels)
max_channels = vs->chmaps[i].channels;
return snd_pcm_add_chmap_ctls(pcm, direction, vs->chmaps, max_channels,
0, NULL);
}
/**
* virtsnd_chmap_build_devs() - Build ALSA controls for channel maps.
* @snd: VirtIO sound device.
*
* Context: Any context.
* Return: 0 on success, -errno on failure.
*/
int virtsnd_chmap_build_devs(struct virtio_snd *snd)
{
struct virtio_device *vdev = snd->vdev;
struct virtio_pcm *vpcm;
struct virtio_pcm_stream *vs;
u32 i;
int rc;
/* Allocate channel map elements per each PCM device/stream. */
list_for_each_entry(vpcm, &snd->pcm_list, list) {
for (i = 0; i < ARRAY_SIZE(vpcm->streams); ++i) {
vs = &vpcm->streams[i];
if (!vs->nchmaps)
continue;
vs->chmaps = devm_kcalloc(&vdev->dev, vs->nchmaps + 1,
sizeof(*vs->chmaps),
GFP_KERNEL);
if (!vs->chmaps)
return -ENOMEM;
vs->nchmaps = 0;
}
}
/* Initialize channel maps per each PCM device/stream. */
for (i = 0; i < snd->nchmaps; ++i) {
struct virtio_snd_chmap_info *info = &snd->chmaps[i];
unsigned int channels = info->channels;
unsigned int ch;
struct snd_pcm_chmap_elem *chmap;
vpcm = virtsnd_pcm_find(snd, le32_to_cpu(info->hdr.hda_fn_nid));
if (IS_ERR(vpcm))
return PTR_ERR(vpcm);
if (info->direction == VIRTIO_SND_D_OUTPUT)
vs = &vpcm->streams[SNDRV_PCM_STREAM_PLAYBACK];
else
vs = &vpcm->streams[SNDRV_PCM_STREAM_CAPTURE];
chmap = &vs->chmaps[vs->nchmaps++];
if (channels > ARRAY_SIZE(chmap->map))
channels = ARRAY_SIZE(chmap->map);
chmap->channels = channels;
for (ch = 0; ch < channels; ++ch) {
u8 position = info->positions[ch];
if (position >= ARRAY_SIZE(g_v2a_position_map))
return -EINVAL;
chmap->map[ch] = g_v2a_position_map[position];
}
}
/* Create an ALSA control per each PCM device/stream. */
list_for_each_entry(vpcm, &snd->pcm_list, list) {
if (!vpcm->pcm)
continue;
for (i = 0; i < ARRAY_SIZE(vpcm->streams); ++i) {
vs = &vpcm->streams[i];
if (!vs->nchmaps)
continue;
rc = virtsnd_chmap_add_ctls(vpcm->pcm, i, vs);
if (rc)
return rc;
}
}
return 0;
}
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