1 // SPDX-License-Identifier: GPL-2.0+
3  * virtio-snd: Virtio sound device
10 /* VirtIO->ALSA channel position map */
52  * virtsnd_chmap_parse_cfg() - Parse the channel map configuration.
57  * Context: Any context that permits to sleep.
58  * Return: 0 on success, -errno on failure.
62 	struct virtio_device *vdev = snd->vdev;  in virtsnd_chmap_parse_cfg()
66 	virtio_cread_le(vdev, struct virtio_snd_config, chmaps, &snd->nchmaps);  in virtsnd_chmap_parse_cfg()
67 	if (!snd->nchmaps)  in virtsnd_chmap_parse_cfg()
70 	snd->chmaps = devm_kcalloc(&vdev->dev, snd->nchmaps,  in virtsnd_chmap_parse_cfg()
71 				   sizeof(*snd->chmaps), GFP_KERNEL);  in virtsnd_chmap_parse_cfg()
72 	if (!snd->chmaps)  in virtsnd_chmap_parse_cfg()
73 		return -ENOMEM;  in virtsnd_chmap_parse_cfg()
76 				    snd->nchmaps, sizeof(*snd->chmaps),  in virtsnd_chmap_parse_cfg()
77 				    snd->chmaps);  in virtsnd_chmap_parse_cfg()
81 	/* Count the number of channel maps per each PCM device/stream. */  in virtsnd_chmap_parse_cfg()
82 	for (i = 0; i < snd->nchmaps; ++i) {  in virtsnd_chmap_parse_cfg()
83 		struct virtio_snd_chmap_info *info = &snd->chmaps[i];  in virtsnd_chmap_parse_cfg()
84 		u32 nid = le32_to_cpu(info->hdr.hda_fn_nid);  in virtsnd_chmap_parse_cfg()
92 		switch (info->direction) {  in virtsnd_chmap_parse_cfg()
94 			vs = &vpcm->streams[SNDRV_PCM_STREAM_PLAYBACK];  in virtsnd_chmap_parse_cfg()
97 			vs = &vpcm->streams[SNDRV_PCM_STREAM_CAPTURE];  in virtsnd_chmap_parse_cfg()
100 			dev_err(&vdev->dev,  in virtsnd_chmap_parse_cfg()
102 				info->direction);  in virtsnd_chmap_parse_cfg()
103 			return -EINVAL;  in virtsnd_chmap_parse_cfg()
106 		vs->nchmaps++;  in virtsnd_chmap_parse_cfg()
113  * virtsnd_chmap_add_ctls() - Create an ALSA control for channel maps.
118  * Context: Any context.
119  * Return: 0 on success, -errno on failure.
127 	for (i = 0; i < vs->nchmaps; i++)  in virtsnd_chmap_add_ctls()
128 		if (max_channels < vs->chmaps[i].channels)  in virtsnd_chmap_add_ctls()
129 			max_channels = vs->chmaps[i].channels;  in virtsnd_chmap_add_ctls()
131 	return snd_pcm_add_chmap_ctls(pcm, direction, vs->chmaps, max_channels,  in virtsnd_chmap_add_ctls()
136  * virtsnd_chmap_build_devs() - Build ALSA controls for channel maps.
139  * Context: Any context.
140  * Return: 0 on success, -errno on failure.
144 	struct virtio_device *vdev = snd->vdev;  in virtsnd_chmap_build_devs()
150 	/* Allocate channel map elements per each PCM device/stream. */  in virtsnd_chmap_build_devs()
151 	list_for_each_entry(vpcm, &snd->pcm_list, list) {  in virtsnd_chmap_build_devs()
152 		for (i = 0; i < ARRAY_SIZE(vpcm->streams); ++i) {  in virtsnd_chmap_build_devs()
153 			vs = &vpcm->streams[i];  in virtsnd_chmap_build_devs()
155 			if (!vs->nchmaps)  in virtsnd_chmap_build_devs()
158 			vs->chmaps = devm_kcalloc(&vdev->dev, vs->nchmaps + 1,  in virtsnd_chmap_build_devs()
159 						  sizeof(*vs->chmaps),  in virtsnd_chmap_build_devs()
161 			if (!vs->chmaps)  in virtsnd_chmap_build_devs()
162 				return -ENOMEM;  in virtsnd_chmap_build_devs()
164 			vs->nchmaps = 0;  in virtsnd_chmap_build_devs()
168 	/* Initialize channel maps per each PCM device/stream. */  in virtsnd_chmap_build_devs()
169 	for (i = 0; i < snd->nchmaps; ++i) {  in virtsnd_chmap_build_devs()
170 		struct virtio_snd_chmap_info *info = &snd->chmaps[i];  in virtsnd_chmap_build_devs()
171 		unsigned int channels = info->channels;  in virtsnd_chmap_build_devs()
175 		vpcm = virtsnd_pcm_find(snd, le32_to_cpu(info->hdr.hda_fn_nid));  in virtsnd_chmap_build_devs()
179 		if (info->direction == VIRTIO_SND_D_OUTPUT)  in virtsnd_chmap_build_devs()
180 			vs = &vpcm->streams[SNDRV_PCM_STREAM_PLAYBACK];  in virtsnd_chmap_build_devs()
182 			vs = &vpcm->streams[SNDRV_PCM_STREAM_CAPTURE];  in virtsnd_chmap_build_devs()
184 		chmap = &vs->chmaps[vs->nchmaps++];  in virtsnd_chmap_build_devs()
186 		if (channels > ARRAY_SIZE(chmap->map))  in virtsnd_chmap_build_devs()
187 			channels = ARRAY_SIZE(chmap->map);  in virtsnd_chmap_build_devs()
189 		chmap->channels = channels;  in virtsnd_chmap_build_devs()
192 			u8 position = info->positions[ch];  in virtsnd_chmap_build_devs()
195 				return -EINVAL;  in virtsnd_chmap_build_devs()
197 			chmap->map[ch] = g_v2a_position_map[position];  in virtsnd_chmap_build_devs()
201 	/* Create an ALSA control per each PCM device/stream. */  in virtsnd_chmap_build_devs()
202 	list_for_each_entry(vpcm, &snd->pcm_list, list) {  in virtsnd_chmap_build_devs()
203 		if (!vpcm->pcm)  in virtsnd_chmap_build_devs()
206 		for (i = 0; i < ARRAY_SIZE(vpcm->streams); ++i) {  in virtsnd_chmap_build_devs()
207 			vs = &vpcm->streams[i];  in virtsnd_chmap_build_devs()
209 			if (!vs->nchmaps)  in virtsnd_chmap_build_devs()
212 			rc = virtsnd_chmap_add_ctls(vpcm->pcm, i, vs);  in virtsnd_chmap_build_devs()