[media] em28xx-audio: Some Alsa API fixes

Mark the alsa stream with SNDRV_PCM_INFO_BATCH,
as the timing to get audio streams can vary.

Also, add SNDRV_PCM_TRIGGER for pause/release.

while here, fix the stop indicator, to be sure that audio
will be properly released at the stop events.
Signed-off-by: NMauro Carvalho Chehab <mchehab@redhat.com>

drivers/media/video/em28xx/em28xx-audio.c

@@ -249,6 +249,7 @@ static struct snd_pcm_hardware snd_em28xx_hw_capture = {
 	.info = SNDRV_PCM_INFO_BLOCK_TRANSFER |
 		SNDRV_PCM_INFO_MMAP           |
 		SNDRV_PCM_INFO_INTERLEAVED    |
+		SNDRV_PCM_INFO_BATCH	      |
 		SNDRV_PCM_INFO_MMAP_VALID,
 
 	.formats = SNDRV_PCM_FMTBIT_S16_LE,
@@ -401,11 +402,15 @@ static int snd_em28xx_capture_trigger(struct snd_pcm_substream *substream,
 	int retval = 0;
 
 	switch (cmd) {
+	case SNDRV_PCM_TRIGGER_PAUSE_RELEASE: /* fall through */
+	case SNDRV_PCM_TRIGGER_RESUME: /* fall through */
 	case SNDRV_PCM_TRIGGER_START:
 		atomic_set(&dev->stream_started, 1);
 		break;
+	case SNDRV_PCM_TRIGGER_PAUSE_PUSH: /* fall through */
+	case SNDRV_PCM_TRIGGER_SUSPEND: /* fall through */
 	case SNDRV_PCM_TRIGGER_STOP:
-		atomic_set(&dev->stream_started, 1);
+		atomic_set(&dev->stream_started, 0);
 		break;
 	default:
 		retval = -EINVAL;