diff options
| author | Eldad Zack <eldad@fogrefinery.com> | 2013-08-03 10:50:21 +0200 |
|---|---|---|
| committer | Takashi Iwai <tiwai@suse.de> | 2013-08-06 10:51:48 +0200 |
| commit | 914273c714845e2f3363e962f6dff59626a79fa3 (patch) | |
| tree | 6b08a703929667e9c9e6387b4272518abedab5f8 /sound/usb/pcm.c | |
| parent | ALSA: usb-audio: do not initialize and check implicit_fb (diff) | |
| download | linux-914273c714845e2f3363e962f6dff59626a79fa3.tar.xz linux-914273c714845e2f3363e962f6dff59626a79fa3.zip | |
ALSA: usb-audio: remove is_playback from implicit feedback quirks
An implicit feedback endpoint can only be a capture source. The
consumer (sink) of the implicit feedback endpoint is therefore limited
to playback EPs.
Check if the target endpoint is a playback first and remove redundant
checks.
Signed-off-by: Eldad Zack <eldad@fogrefinery.com>
Signed-off-by: Takashi Iwai <tiwai@suse.de>
Diffstat (limited to 'sound/usb/pcm.c')
| -rw-r--r-- | sound/usb/pcm.c | 40 |
1 files changed, 19 insertions, 21 deletions
diff --git a/sound/usb/pcm.c b/sound/usb/pcm.c index bb2e0f52e92f..af30e08e3d3b 100644 --- a/sound/usb/pcm.c +++ b/sound/usb/pcm.c @@ -334,41 +334,39 @@ static int set_sync_ep_implicit_fb_quirk(struct snd_usb_substream *subs, { struct usb_host_interface *alts; struct usb_interface *iface; - int is_playback = subs->direction == SNDRV_PCM_STREAM_PLAYBACK; int implicit_fb = 0; unsigned int ep; + /* Implicit feedback sync EPs consumers are always playback EPs */ + if (subs->direction != SNDRV_PCM_STREAM_PLAYBACK) + return 0; + switch (subs->stream->chip->usb_id) { case USB_ID(0x0763, 0x2030): /* M-Audio Fast Track C400 */ case USB_ID(0x0763, 0x2031): /* M-Audio Fast Track C600 */ - if (is_playback) { - implicit_fb = 1; - ep = 0x81; - iface = usb_ifnum_to_if(dev, 3); + implicit_fb = 1; + ep = 0x81; + iface = usb_ifnum_to_if(dev, 3); - if (!iface || iface->num_altsetting == 0) - return -EINVAL; + if (!iface || iface->num_altsetting == 0) + return -EINVAL; - alts = &iface->altsetting[1]; - goto add_sync_ep; - } + alts = &iface->altsetting[1]; + goto add_sync_ep; break; case USB_ID(0x0763, 0x2080): /* M-Audio FastTrack Ultra */ case USB_ID(0x0763, 0x2081): - if (is_playback) { - implicit_fb = 1; - ep = 0x81; - iface = usb_ifnum_to_if(dev, 2); + implicit_fb = 1; + ep = 0x81; + iface = usb_ifnum_to_if(dev, 2); - if (!iface || iface->num_altsetting == 0) - return -EINVAL; + if (!iface || iface->num_altsetting == 0) + return -EINVAL; - alts = &iface->altsetting[1]; - goto add_sync_ep; - } + alts = &iface->altsetting[1]; + goto add_sync_ep; } - if (is_playback && - attr == USB_ENDPOINT_SYNC_ASYNC && + if (attr == USB_ENDPOINT_SYNC_ASYNC && altsd->bInterfaceClass == USB_CLASS_VENDOR_SPEC && altsd->bInterfaceProtocol == 2 && altsd->bNumEndpoints == 1 && |