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 --- sound/firewire/dice/dice-pcm.c | 29 +++++++++++++++++++++-------- 1 file changed, 21 insertions(+), 8 deletions(-)
diff --git a/sound/firewire/dice/dice-pcm.c b/sound/firewire/dice/dice-pcm.c index 0b6e6bb..a5c9b58 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, + ®, 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, + ®, 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)