r74 WORKS!!!!! - I can see myself :))))
dmesg out on load:

[ 4447.340000] Linux video capture interface: v2.00
[ 4447.376000] usbcam: registering driver r5u870 0.11.1SVN
[ 4447.376000] r5u870-0: Detected HP Pavilion Webcam (UVC - NO FW)
[ 4447.376000] r5u870-0: Found format 1: YUYV (5 frames)
[ 4447.376000] r5u870-0: Found resolution 1: 640x480 ival 416666
(14745600 B/s)
[ 4447.376000] r5u870-0: Found resolution 2: 352x288 ival 416666
(4866048 B/s)
[ 4447.376000] r5u870-0: Found resolution 3: 320x240 ival 416666
(3686400 B/s)
[ 4447.376000] r5u870-0: Found resolution 4: 176x144 ival 416666
(1216512 B/s)
[ 4447.376000] r5u870-0: Found resolution 5: 160x120 ival 416666
(921600 B/s)
[ 4447.376000] r5u870-0: Found UVC control Hue [-180,180] def:0 info:03
[ 4447.380000] r5u870-0: Added 6 WDM controls
[ 4447.380000] r5u870-0: control Hue/uvc 06 <= 0
[ 4447.380000] r5u870-0: control White Balance Red <= 127 [capture off]
[ 4447.380000] r5u870-0: control White Balance Green <= 127 [capture off]
[ 4447.380000] r5u870-0: control White Balance Blue <= 127 [capture off]
[ 4447.380000] r5u870-0: control V-Flip <= 0 [capture off]
[ 4447.380000] r5u870-0: control H-Flip <= 0 [capture off]
[ 4447.380000] r5u870-0: control Privacy <= 0 [capture off]
[ 4447.380000] r5u870-0: registered as video0
[ 4447.380000] usbcore: registered new interface driver r5u870

xawtv out:
ioctl: VIDIOC_S_STD(std=0x0 []): Invalid argument
v4l2: read: Input/Output error

dmesg out;
http://dv6597.netia.es/up/dmesg.r74 (I think is cutted because not
enough buffer space in syslog, I'll try to get only one frame)