ALSA: ctxfi: Implement channel maps

Assign the multi-channel map to front PCM, and other channel map to
each other channel PCM.

Signed-off-by: Takashi Iwai <tiwai@suse.de>

1 files changed, 50 insertions, 0 deletions

diff --git a/sound/pci/ctxfi/ctpcm.c b/sound/pci/ctxfi/ctpcm.c
index d021876901bb..6c191429b126 100644
--- a/sound/pci/ctxfi/ctpcm.c
+++ b/sound/pci/ctxfi/ctpcm.c
@@ -395,12 +395,38 @@ static struct snd_pcm_ops ct_pcm_capture_ops = {
         .page           = snd_pcm_sgbuf_ops_page,
 };
 
+static const struct snd_pcm_chmap_elem surround_map[] = {
+        { .channels = 1,
+          .map = { SNDRV_CHMAP_RC } },
+        { .channels = 2,
+          .map = { SNDRV_CHMAP_RL, SNDRV_CHMAP_RR } },
+        { }
+};
+
+static const struct snd_pcm_chmap_elem clfe_map[] = {
+        { .channels = 1,
+          .map = { SNDRV_CHMAP_FC } },
+        { .channels = 2,
+          .map = { SNDRV_CHMAP_FC, SNDRV_CHMAP_LFE } },
+        { }
+};
+
+static const struct snd_pcm_chmap_elem side_map[] = {
+        { .channels = 1,
+          .map = { SNDRV_CHMAP_RC } },
+        { .channels = 2,
+          .map = { SNDRV_CHMAP_SL, SNDRV_CHMAP_SR } },
+        { }
+};
+
 /* Create ALSA pcm device */
 int ct_alsa_pcm_create(struct ct_atc *atc,
                        enum CTALSADEVS device,
                        const char *device_name)
 {
         struct snd_pcm *pcm;
+        const struct snd_pcm_chmap_elem *map;
+        int chs;
         int err;
         int playback_count, capture_count;
 
@@ -427,6 +453,30 @@ int ct_alsa_pcm_create(struct ct_atc *atc,
         snd_pcm_lib_preallocate_pages_for_all(pcm, SNDRV_DMA_TYPE_DEV_SG,
                         snd_dma_pci_data(atc->pci), 128*1024, 128*1024);
 
+        chs = 2;
+        switch (device) {
+        case FRONT:
+                chs = 8;
+                map = snd_pcm_std_chmaps;
+                break;
+        case SURROUND:
+                map = surround_map;
+                break;
+        case CLFE:
+                map = clfe_map;
+                break;
+        case SIDE:
+                map = side_map;
+                break;
+        default:
+                map = snd_pcm_std_chmaps;
+                break;
+        }
+        err = snd_pcm_add_chmap_ctls(pcm, SNDRV_PCM_STREAM_PLAYBACK, map, chs,
+                                     0, NULL);
+        if (err < 0)
+                return err;
+
 #ifdef CONFIG_PM_SLEEP
         atc->pcms[device] = pcm;
 #endif