Hi Samir,
please CC the list when answering.
On Monday 26 November 2007, Samir Ibradzic wrote:
> Laurent, thanks for very fast reply!
>
> I applied the patch, it still fails at second request (129). Any further
> patches and/or tests i could try?
>
> dmsg output (when tried with 'modprobe uvcvideo trace=15'):
>
[snip]
> [ 223.544000] uvcvideo: Probing generic UVC device 1
> [ 223.544000] uvcvideo: Found format MJPEG.
> [ 223.544000] uvcvideo: - 320x240 (15.0 fps)
> [ 223.544000] uvcvideo: Found UVC 1.10 device au W33SA (0474:0722)
> [ 223.544000] uvcvideo: Scanning UVC chain: OT 3 <- PU 2 <- IT 1
> [ 223.544000] uvcvideo: Found a valid video chain (1 -> 3).
> [ 223.556000] uvcvideo: Failed to query (129) UVC control 1 (unit 0) :
> -32 (exp. 34).
> [ 223.556000] uvcvideo: Failed to initialize the device (-5).
> [ 223.556000] usbcore: registered new interface driver uvcvideo
> [ 223.556000] USB Video Class driver (v0.1.0)
Let's try something else then. The attached patch writes the video streaming
probe with a dummy value (all 0's) before attempting to retrieve it. Let me
know if it helps.
Best regards,
Laurent Pinchart
Index: uvc_video.c
===================================================================
--- uvc_video.c (revision 147)
+++ uvc_video.c (working copy)
@@ -897,9 +897,15 @@
/* Some webcams don't suport GET_DEF request on the probe control. We
* fall back to GET_CUR if GET_DEF fails.
*/
- if ((ret = uvc_get_video_ctrl(video, probe, 1, GET_DEF)) < 0 &&
- (ret = uvc_get_video_ctrl(video, probe, 1, GET_CUR)) < 0)
+ memset(probe, 0, sizeof *probe);
+ if ((ret = uvc_set_video_ctrl(video, probe, 1, SET_CUR)) < 0) {
+ uvc_printk(KERN_INFO, "Failed to initialize probe control.\n");
return ret;
+ }
+ if ((ret = uvc_get_video_ctrl(video, probe, 1, GET_CUR)) < 0) {
+ uvc_printk(KERN_INFO, "Failed to read probe control.\n");
+ return ret;
+ }
/* Check if the default format descriptor exists. Use the first
* available format otherwise.
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