[PATCH] em28xx: register device to soundcard for sysfs

[Nicola Soranzo <nsoranzo@tiscali.it>]

As explained in "Writing an ALSA driver" (T. Iwai), audio drivers should
set the struct device for the card before registering the card instance.
This will add the correct /sys/class/sound/cardN/device symlink, so HAL
can see the device and ConsoleKit sets its ACL permissions for the
logged-in user.

For em28xx audio capture cards found e.g. in Hauppauge WinTV-HVR-900 (R2),
this patch fixes errors like:

ALSA lib pcm_hw.c:1429:(_snd_pcm_hw_open) Invalid value for card
Error opening audio: Permission denied

when running mplayer as a normal user.

Priority: normal

Signed-off-by: Nicola Soranzo <nsoranzo@tiscali.it>
---
diff -r 80e785538796 -r ef8cc17cc048 linux/drivers/media/video/em28xx/em28xx-audio.c
--- a/linux/drivers/media/video/em28xx/em28xx-audio.c	Wed Feb 18 18:27:33 2009 +0100
+++ b/linux/drivers/media/video/em28xx/em28xx-audio.c	Thu Feb 19 17:36:44 2009 +0100
@@ -560,6 +560,8 @@
 	pcm->info_flags = 0;
 	pcm->private_data = dev;
 	strcpy(pcm->name, "Empia 28xx Capture");
+
+	snd_card_set_dev(card, &dev->udev->dev);
 	strcpy(card->driver, "Empia Em28xx Audio");
 	strcpy(card->shortname, "Em28xx Audio");
 	strcpy(card->longname, "Empia Em28xx Audio");