On 12.01.2014 18:37, Mauro Carvalho Chehab wrote:
Em Sat, 11 Jan 2014 14:42:30 +0100
Frank Schäfer <fschaefer....@googlemail.com> escreveu:
Previously, we've been assuming that the video endpoints are always at usb
interface 0. Hence, if vendor audio endpoints are provided at a separate
interface, they were supposed to be at interface number > 0.
Instead of checking for (interface number > 0) to determine if an interface is a
pure audio interface, dev->is_audio_only should be checked.
Signed-off-by: Frank Schäfer <fschaefer....@googlemail.com>
---
drivers/media/usb/em28xx/em28xx-audio.c | 15 +++++++++++++--
1 Datei geändert, 13 Zeilen hinzugefügt(+), 2 Zeilen entfernt(-)
diff --git a/drivers/media/usb/em28xx/em28xx-audio.c
b/drivers/media/usb/em28xx/em28xx-audio.c
index b2ae954..18b745f 100644
--- a/drivers/media/usb/em28xx/em28xx-audio.c
+++ b/drivers/media/usb/em28xx/em28xx-audio.c
@@ -243,11 +243,22 @@ static int snd_em28xx_capture_open(struct
snd_pcm_substream *substream)
}
runtime->hw = snd_em28xx_hw_capture;
- if ((dev->alt == 0 || dev->ifnum) && dev->adev.users == 0) {
- if (dev->ifnum)
+ if (dev->adev.users == 0 && (dev->alt == 0 || dev->is_audio_only)) {
+ if (dev->is_audio_only)
+ /* vendor audio is on a separate interface */
dev->alt = 1;
else
+ /* vendor audio is on the same interface as video */
dev->alt = 7;
+ /*
+ * FIXME: The intention seems to be to select the alt
+ * setting with the largest wMaxPacketSize for the video
+ * endpoint.
+ * At least dev->alt and dev->dvb_alt_isoc should be
+ * used instead, but we should probably not touch it at
+ * all if it is already >0, because wMaxPacketSize of
+ * the audio endpoints seems to be the same for all.
+ */
Actually, it should take into account only the analog case, since, in
digital mode, the audio comes via the MPEG stream instead.
Yes, of course you are absolutely right.
I will fix the comment.
Ok, it makes sense to return -EBUSY if one tries to use it while using
DVB.
dprintk("changing alternate number on interface %d to %d\n",
dev->ifnum, dev->alt);
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