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authorTakashi Sakamoto <o-takashi@sakamocchi.jp>2016-02-08 22:54:18 +0900
committerTakashi Iwai <tiwai@suse.de>2016-02-09 12:22:10 +0100
commitc30076568d20bd6f7a4e021b19672a6b03266430 (patch)
treed62eab25502ccdf81ccd4934e009c09b4fcd77db /sound/firewire
parentb9022f4d2cb4660249036768f7d09442b213d12f (diff)
downloadlinux-c30076568d20bd6f7a4e021b19672a6b03266430.tar.bz2
ALSA: dice: get the number of MBLA data channel at opening PCM substream
This commit is a preparation to remove members related to channel cache for the number of channels for multi bit linear audio data and MIDI ports. This commit changes the way to get the number of multi bit linear audio data channel. It's directly retrieved by asynchronous transactions to some registers. Signed-off-by: Takashi Sakamoto <o-takashi@sakamocchi.jp> Signed-off-by: Takashi Iwai <tiwai@suse.de>
Diffstat (limited to 'sound/firewire')
-rw-r--r--sound/firewire/dice/dice-pcm.c29
1 files changed, 21 insertions, 8 deletions
diff --git a/sound/firewire/dice/dice-pcm.c b/sound/firewire/dice/dice-pcm.c
index 0b6e6bbed4b8..a5c9b58655ef 100644
--- a/sound/firewire/dice/dice-pcm.c
+++ b/sound/firewire/dice/dice-pcm.c
@@ -294,17 +294,30 @@ int snd_dice_create_pcm(struct snd_dice *dice)
.page = snd_pcm_lib_get_vmalloc_page,
.mmap = snd_pcm_lib_mmap_vmalloc,
};
+ __be32 reg;
struct snd_pcm *pcm;
- unsigned int i, capture, playback;
+ unsigned int capture, playback;
int err;
- capture = playback = 0;
- for (i = 0; i < 3; i++) {
- if (dice->tx_channels[i] > 0)
- capture = 1;
- if (dice->rx_channels[i] > 0)
- playback = 1;
- }
+ /*
+ * Check whether PCM substreams are required.
+ *
+ * TODO: in the case that any PCM substreams are not avail at a certain
+ * sampling transfer frequency?
+ */
+ err = snd_dice_transaction_read_tx(dice, TX_NUMBER_AUDIO,
+ &reg, sizeof(reg));
+ if (err < 0)
+ return err;
+ if (be32_to_cpu(reg) > 0)
+ capture = 1;
+
+ err = snd_dice_transaction_read_rx(dice, RX_NUMBER_AUDIO,
+ &reg, sizeof(reg));
+ if (err < 0)
+ return err;
+ if (be32_to_cpu(reg) > 0)
+ playback = 1;
err = snd_pcm_new(dice->card, "DICE", 0, playback, capture, &pcm);
if (err < 0)