ALSA: virtio: introduce PCM channel map support
Enumerate all available PCM channel maps and create ALSA controls. Signed-off-by: Anton Yakovlev <anton.yakovlev@opensynergy.com> Link: https://lore.kernel.org/r/20210302164709.3142702-9-anton.yakovlev@opensynergy.com Signed-off-by: Takashi Iwai <tiwai@suse.de>
This commit is contained in:
Anton Yakovlev
Takashi Iwai
parent
ca61a41f38
commit
19325fedf2
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@ -4,6 +4,7 @@ obj-$(CONFIG_SND_VIRTIO) += virtio_snd.o
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virtio_snd-objs := \
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virtio_card.o \
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virtio_chmap.o \
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virtio_ctl_msg.o \
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virtio_jack.o \
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virtio_pcm.o \
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@ -231,6 +231,10 @@ static int virtsnd_build_devs(struct virtio_snd *snd)
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if (rc)
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return rc;
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rc = virtsnd_chmap_parse_cfg(snd);
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if (rc)
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return rc;
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if (snd->njacks) {
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rc = virtsnd_jack_build_devs(snd);
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if (rc)
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@ -243,6 +247,12 @@ static int virtsnd_build_devs(struct virtio_snd *snd)
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return rc;
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}
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if (snd->nchmaps) {
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rc = virtsnd_chmap_build_devs(snd);
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if (rc)
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return rc;
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}
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return snd_card_register(snd->card);
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}
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@ -43,6 +43,8 @@ struct virtio_snd_queue {
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* @njacks: Number of jacks.
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* @substreams: VirtIO PCM substreams.
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* @nsubstreams: Number of PCM substreams.
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* @chmaps: VirtIO channel maps.
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* @nchmaps: Number of channel maps.
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*/
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struct virtio_snd {
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struct virtio_device *vdev;
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@ -55,6 +57,8 @@ struct virtio_snd {
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u32 njacks;
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struct virtio_pcm_substream *substreams;
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u32 nsubstreams;
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struct virtio_snd_chmap_info *chmaps;
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u32 nchmaps;
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};
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/* Message completion timeout in milliseconds (module parameter). */
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@ -100,4 +104,8 @@ int virtsnd_jack_build_devs(struct virtio_snd *snd);
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void virtsnd_jack_event(struct virtio_snd *snd,
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struct virtio_snd_event *event);
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int virtsnd_chmap_parse_cfg(struct virtio_snd *snd);
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int virtsnd_chmap_build_devs(struct virtio_snd *snd);
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#endif /* VIRTIO_SND_CARD_H */
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@ -0,0 +1,219 @@
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// SPDX-License-Identifier: GPL-2.0+
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/*
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* virtio-snd: Virtio sound device
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* Copyright (C) 2021 OpenSynergy GmbH
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*/
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#include <linux/virtio_config.h>
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#include "virtio_card.h"
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/* VirtIO->ALSA channel position map */
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static const u8 g_v2a_position_map[] = {
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[VIRTIO_SND_CHMAP_NONE] = SNDRV_CHMAP_UNKNOWN,
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[VIRTIO_SND_CHMAP_NA] = SNDRV_CHMAP_NA,
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[VIRTIO_SND_CHMAP_MONO] = SNDRV_CHMAP_MONO,
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[VIRTIO_SND_CHMAP_FL] = SNDRV_CHMAP_FL,
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[VIRTIO_SND_CHMAP_FR] = SNDRV_CHMAP_FR,
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[VIRTIO_SND_CHMAP_RL] = SNDRV_CHMAP_RL,
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[VIRTIO_SND_CHMAP_RR] = SNDRV_CHMAP_RR,
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[VIRTIO_SND_CHMAP_FC] = SNDRV_CHMAP_FC,
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[VIRTIO_SND_CHMAP_LFE] = SNDRV_CHMAP_LFE,
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[VIRTIO_SND_CHMAP_SL] = SNDRV_CHMAP_SL,
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[VIRTIO_SND_CHMAP_SR] = SNDRV_CHMAP_SR,
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[VIRTIO_SND_CHMAP_RC] = SNDRV_CHMAP_RC,
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[VIRTIO_SND_CHMAP_FLC] = SNDRV_CHMAP_FLC,
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[VIRTIO_SND_CHMAP_FRC] = SNDRV_CHMAP_FRC,
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[VIRTIO_SND_CHMAP_RLC] = SNDRV_CHMAP_RLC,
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[VIRTIO_SND_CHMAP_RRC] = SNDRV_CHMAP_RRC,
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[VIRTIO_SND_CHMAP_FLW] = SNDRV_CHMAP_FLW,
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[VIRTIO_SND_CHMAP_FRW] = SNDRV_CHMAP_FRW,
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[VIRTIO_SND_CHMAP_FLH] = SNDRV_CHMAP_FLH,
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[VIRTIO_SND_CHMAP_FCH] = SNDRV_CHMAP_FCH,
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[VIRTIO_SND_CHMAP_FRH] = SNDRV_CHMAP_FRH,
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[VIRTIO_SND_CHMAP_TC] = SNDRV_CHMAP_TC,
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[VIRTIO_SND_CHMAP_TFL] = SNDRV_CHMAP_TFL,
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[VIRTIO_SND_CHMAP_TFR] = SNDRV_CHMAP_TFR,
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[VIRTIO_SND_CHMAP_TFC] = SNDRV_CHMAP_TFC,
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[VIRTIO_SND_CHMAP_TRL] = SNDRV_CHMAP_TRL,
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[VIRTIO_SND_CHMAP_TRR] = SNDRV_CHMAP_TRR,
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[VIRTIO_SND_CHMAP_TRC] = SNDRV_CHMAP_TRC,
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[VIRTIO_SND_CHMAP_TFLC] = SNDRV_CHMAP_TFLC,
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[VIRTIO_SND_CHMAP_TFRC] = SNDRV_CHMAP_TFRC,
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[VIRTIO_SND_CHMAP_TSL] = SNDRV_CHMAP_TSL,
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[VIRTIO_SND_CHMAP_TSR] = SNDRV_CHMAP_TSR,
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[VIRTIO_SND_CHMAP_LLFE] = SNDRV_CHMAP_LLFE,
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[VIRTIO_SND_CHMAP_RLFE] = SNDRV_CHMAP_RLFE,
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[VIRTIO_SND_CHMAP_BC] = SNDRV_CHMAP_BC,
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[VIRTIO_SND_CHMAP_BLC] = SNDRV_CHMAP_BLC,
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[VIRTIO_SND_CHMAP_BRC] = SNDRV_CHMAP_BRC
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};
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/**
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* virtsnd_chmap_parse_cfg() - Parse the channel map configuration.
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* @snd: VirtIO sound device.
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*
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* This function is called during initial device initialization.
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*
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* Context: Any context that permits to sleep.
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* Return: 0 on success, -errno on failure.
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*/
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int virtsnd_chmap_parse_cfg(struct virtio_snd *snd)
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{
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struct virtio_device *vdev = snd->vdev;
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u32 i;
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int rc;
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virtio_cread_le(vdev, struct virtio_snd_config, chmaps, &snd->nchmaps);
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if (!snd->nchmaps)
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return 0;
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snd->chmaps = devm_kcalloc(&vdev->dev, snd->nchmaps,
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sizeof(*snd->chmaps), GFP_KERNEL);
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if (!snd->chmaps)
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return -ENOMEM;
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rc = virtsnd_ctl_query_info(snd, VIRTIO_SND_R_CHMAP_INFO, 0,
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snd->nchmaps, sizeof(*snd->chmaps),
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snd->chmaps);
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if (rc)
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return rc;
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/* Count the number of channel maps per each PCM device/stream. */
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for (i = 0; i < snd->nchmaps; ++i) {
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struct virtio_snd_chmap_info *info = &snd->chmaps[i];
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u32 nid = le32_to_cpu(info->hdr.hda_fn_nid);
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struct virtio_pcm *vpcm;
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struct virtio_pcm_stream *vs;
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vpcm = virtsnd_pcm_find_or_create(snd, nid);
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if (IS_ERR(vpcm))
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return PTR_ERR(vpcm);
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switch (info->direction) {
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case VIRTIO_SND_D_OUTPUT:
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vs = &vpcm->streams[SNDRV_PCM_STREAM_PLAYBACK];
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break;
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case VIRTIO_SND_D_INPUT:
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vs = &vpcm->streams[SNDRV_PCM_STREAM_CAPTURE];
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break;
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default:
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dev_err(&vdev->dev,
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"chmap #%u: unknown direction (%u)\n", i,
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info->direction);
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return -EINVAL;
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}
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vs->nchmaps++;
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}
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return 0;
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}
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/**
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* virtsnd_chmap_add_ctls() - Create an ALSA control for channel maps.
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* @pcm: ALSA PCM device.
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* @direction: PCM stream direction (SNDRV_PCM_STREAM_XXX).
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* @vs: VirtIO PCM stream.
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*
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* Context: Any context.
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* Return: 0 on success, -errno on failure.
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*/
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static int virtsnd_chmap_add_ctls(struct snd_pcm *pcm, int direction,
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struct virtio_pcm_stream *vs)
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{
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u32 i;
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int max_channels = 0;
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for (i = 0; i < vs->nchmaps; i++)
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if (max_channels < vs->chmaps[i].channels)
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max_channels = vs->chmaps[i].channels;
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return snd_pcm_add_chmap_ctls(pcm, direction, vs->chmaps, max_channels,
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0, NULL);
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}
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/**
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* virtsnd_chmap_build_devs() - Build ALSA controls for channel maps.
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* @snd: VirtIO sound device.
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*
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* Context: Any context.
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* Return: 0 on success, -errno on failure.
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*/
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int virtsnd_chmap_build_devs(struct virtio_snd *snd)
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{
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struct virtio_device *vdev = snd->vdev;
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struct virtio_pcm *vpcm;
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struct virtio_pcm_stream *vs;
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u32 i;
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int rc;
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/* Allocate channel map elements per each PCM device/stream. */
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list_for_each_entry(vpcm, &snd->pcm_list, list) {
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for (i = 0; i < ARRAY_SIZE(vpcm->streams); ++i) {
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vs = &vpcm->streams[i];
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if (!vs->nchmaps)
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continue;
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vs->chmaps = devm_kcalloc(&vdev->dev, vs->nchmaps + 1,
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sizeof(*vs->chmaps),
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GFP_KERNEL);
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if (!vs->chmaps)
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return -ENOMEM;
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vs->nchmaps = 0;
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}
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}
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/* Initialize channel maps per each PCM device/stream. */
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for (i = 0; i < snd->nchmaps; ++i) {
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struct virtio_snd_chmap_info *info = &snd->chmaps[i];
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unsigned int channels = info->channels;
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unsigned int ch;
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struct snd_pcm_chmap_elem *chmap;
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vpcm = virtsnd_pcm_find(snd, le32_to_cpu(info->hdr.hda_fn_nid));
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if (IS_ERR(vpcm))
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return PTR_ERR(vpcm);
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if (info->direction == VIRTIO_SND_D_OUTPUT)
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vs = &vpcm->streams[SNDRV_PCM_STREAM_PLAYBACK];
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else
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vs = &vpcm->streams[SNDRV_PCM_STREAM_CAPTURE];
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chmap = &vs->chmaps[vs->nchmaps++];
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if (channels > ARRAY_SIZE(chmap->map))
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channels = ARRAY_SIZE(chmap->map);
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chmap->channels = channels;
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for (ch = 0; ch < channels; ++ch) {
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u8 position = info->positions[ch];
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if (position >= ARRAY_SIZE(g_v2a_position_map))
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return -EINVAL;
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chmap->map[ch] = g_v2a_position_map[position];
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}
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}
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/* Create an ALSA control per each PCM device/stream. */
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list_for_each_entry(vpcm, &snd->pcm_list, list) {
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if (!vpcm->pcm)
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continue;
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for (i = 0; i < ARRAY_SIZE(vpcm->streams); ++i) {
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vs = &vpcm->streams[i];
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if (!vs->nchmaps)
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continue;
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rc = virtsnd_chmap_add_ctls(vpcm->pcm, i, vs);
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if (rc)
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return rc;
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}
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}
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return 0;
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}
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@ -63,10 +63,14 @@ struct virtio_pcm_substream {
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* struct virtio_pcm_stream - VirtIO PCM stream.
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* @substreams: VirtIO substreams belonging to the stream.
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* @nsubstreams: Number of substreams.
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* @chmaps: Kernel channel maps belonging to the stream.
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* @nchmaps: Number of channel maps.
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*/
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struct virtio_pcm_stream {
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struct virtio_pcm_substream **substreams;
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u32 nsubstreams;
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struct snd_pcm_chmap_elem *chmaps;
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u32 nchmaps;
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};
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/**
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