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| author | Takashi Sakamoto <o-takashi@sakamocchi.jp> | 2017-03-22 13:30:22 +0100 |
|---|---|---|
| committer | Takashi Iwai <tiwai@suse.de> | 2017-03-28 12:33:53 +0200 |
| commit | dd49b2d1f04af9b1f44e9fe82c85f374f662c61b (patch) | |
| tree | 3d24378eea1b2dfb16d3fd808679aea886c1018a /sound/firewire/motu/motu.c | |
| parent | ALSA: firewire-motu: add proc node to show current statuc of clock and packet... (diff) | |
| download | linux-dd49b2d1f04af9b1f44e9fe82c85f374f662c61b.tar.xz linux-dd49b2d1f04af9b1f44e9fe82c85f374f662c61b.zip | |
ALSA: firewire-motu: add PCM functionality
This commit adds PCM functionality to transmit/receive PCM samples.
When one of PCM substreams are running or external clock source is
selected, current sampling rate is used. Else, the sampling rate is
changed according to requests from a userspace application.
Available number of samples in a frame of PCM substream is determined at
open(2) to corresponding PCM character device. Later, packet streaming
starts by ioctl(2) with SNDRV_PCM_IOCTL_PREPARE. In theory, between them,
applications can change state of the unit by any write transaction to
change the number. In this case, this driver may fail packet streaming due
to wrong data format.
Signed-off-by: Takashi Sakamoto <o-takashi@sakamocchi.jp>
Signed-off-by: Takashi Iwai <tiwai@suse.de>
Diffstat (limited to 'sound/firewire/motu/motu.c')
| -rw-r--r-- | sound/firewire/motu/motu.c | 4 |
1 files changed, 4 insertions, 0 deletions
diff --git a/sound/firewire/motu/motu.c b/sound/firewire/motu/motu.c index cbf4ed0f5234..801d6a73b0f3 100644 --- a/sound/firewire/motu/motu.c +++ b/sound/firewire/motu/motu.c @@ -99,6 +99,10 @@ static void do_registration(struct work_struct *work) snd_motu_proc_init(motu); + err = snd_motu_create_pcm_devices(motu); + if (err < 0) + goto error; + err = snd_card_register(motu->card); if (err < 0) goto error; |