I finally got the right module to load. I had some problems with the
versions. r61 initializes correctly the device. This is the output:

[ 1097.172000] Linux video capture interface: v2.00
[ 1097.280000] usbcam: registering driver r5u870 0.11.0
[ 1097.280000] r5u870-0: Detected HP Pavilion Webcam (WDM - NO FW)
[ 1097.280000] r5u870-0: Found format 1: YUYV (5 frames)
[ 1097.280000] r5u870-0: Found resolution 1: 640x480 ival 416666
(14745600 B/s)
[ 1097.280000] r5u870-0: Found resolution 2: 352x288 ival 416666
(4866048 B/s)
[ 1097.280000] r5u870-0: Found resolution 3: 320x240 ival 416666
(3686400 B/s)
[ 1097.280000] r5u870-0: Found resolution 4: 176x144 ival 416666
(1216512 B/s)
[ 1097.280000] r5u870-0: Found resolution 5: 160x120 ival 416666
(921600 B/s)
[ 1097.284000] r5u870-0: Found UVC control Hue [-180,180] def:0 info:03
[ 1097.284000] r5u870-0: Added 11 WDM controls
[ 1097.284000] r5u870-0: control Hue/uvc 06 <= 0
[ 1097.284000] r5u870-0: control Auto White Balance <= 1 [capture off]
[ 1097.284000] r5u870-0: control White Balance Red <= 127 [auto suppress]
[ 1097.284000] r5u870-0: control White Balance Blue <= 127 [auto
suppress]
[ 1097.284000] r5u870-0: control Auto Exposure Control <= 1 [capture off]
[ 1097.284000] r5u870-0: control Exposure <= 255 [auto suppress]
[ 1097.284000] r5u870-0: control Auto Gain Control <= 1 [capture off]
[ 1097.284000] r5u870-0: control Gain <= 63 [auto suppress]
[ 1097.284000] r5u870-0: control V-Flip <= 0 [capture off]
[ 1097.284000] r5u870-0: control H-Flip <= 0 [capture off]
[ 1097.284000] r5u870-0: control Privacy <= 0 [capture off]
[ 1097.284000] r5u870-0: control Night Mode <= 0 [capture off]
[ 1097.284000] r5u870-0: registered as video0
[ 1097.284000] usbcore: registered new interface driver r5u870

but i can't get it work. I've tried to use it with uvcview with this
error output:

YUV422
YUY2
parm.parm.capture.timeperframe.numerator   = 1
parm.parm.capture.timeperframe.denominator = 25
parm.parm.capture.timeperframe.numerator   = 1
parm.parm.capture.timeperframe.denominator = 25
VIDIOC_DQBUF error 5, Input/Output error.

and with this dmesg output:
http://dv6597.netia.es/up/dmesg.uvcview

and if i try with mplayer (mplayer -fps 24 -tv
driver=v4l2:outfmt=uyvy:width=640 tv://)
this is the output:
http://dv6597.netia.es/up/dmesg.mplayer

I also upload the snoopypro output after a cold reboot (the system
was a couple of minutes switched off without any source power -
battery/AC) in xml and normal output:
http://dv6597.netia.es/up/snoopyproexport.log  (XML)
http://dv6597.netia.es/up/usblog1.usblog