I have a Logitech ClickSmart 510 webcam.
I am trying to get it work with Linux but without success.

When I do "tail -F /var/log/syslog" and plug in / unplyg the USB camera I get the following message:

Sep 29 23:08:32 mother kernel: Linux video capture interface: v1.00
Sep 29 23:08:48 mother kernel: usb.c: USB disconnect on device 00:07.2-2 address 4
Sep 29 23:08:54 mother kernel: hub.c: new USB device 00:07.2-2, assigned address 5
Sep 29 23:08:54 mother kernel: usb.c: USB device 5 (vend/prod 0x46d/0x901) is not claimed by any active driver.
Sep 29 23:08:59 mother /etc/hotplug/usb.agent: ... no modules for USB product 46d/901/90
Sep 29 23:09:04 mother kernel: usb.c: registered new driver spca50x
Sep 29 23:09:04 mother kernel: drivers/usb/spca50x.c: spca50x driver version 0.30 registered
Sep 29 23:09:24 mother kernel: usb.c: USB disconnect on device 00:07.2-2 address 5
Sep 29 23:09:30 mother kernel: hub.c: new USB device 00:07.2-2, assigned address 6
Sep 29 23:09:30 mother kernel: usb.c: USB device 6 (vend/prod 0x46d/0x901) is not claimed by any active driver.
Sep 29 23:09:35 mother /etc/hotplug/usb.agent: ... no modules for USB product 46d/901/90

The driver doesn't claim the device.

Here is more information about the system:

"uname -r" : 2.4.21-0.13mdk

"lsmod":
Module Size Used by Not tainted
spca5spca50x-0.300x-0.30 91232 0
videodev 7872 0 [spca50x-0.30]
lp 8096 0
parport_pc 25096 1
parport 34176 1 [lp parport_pc]
nfsd 74256 8 (autoclean)
af_packet 14952 1 (autoclean)
floppy 55132 0
8139too 17160 0 (autoclean) (unused)
mii 3832 0 (autoclean) [8139too]
3c59x 29584 1 (autoclean)
supermount 15296 2 (autoclean)
sb 9044 0 (unused)
sb_lib 41454 0 [sb]
uart401 8196 0 [sb_lib]
sound 70644 0 [sb_lib uart401]
soundcore 6276 0 [sb_lib sound]
usb-uhci 24652 0 (unused)
usbcore 72992 1 [spca50x-0.30 usb-uhci]
rtc 8060 0 (autoclean)
sd_mod 11548 2
aic7xxx 120860 1
scsi_mod 91796 2 [sd_mod aic7xxx]

The driver spca50x-0.30 is loaded successfully.

"lsusb":
Invalid product/subclass spec at line 2650
Bus 001 Device 001: ID 0000:0000
Bus 001 Device 006: ID 046d:0901 Logitech Inc. ClickSmart 510


Any idea?

Get an updated driver from here.

As you are running a 0.30 release, you have a very old driver. Michel Xhaard has up-to-date drivers for the spca50x chipsets, as the driver is at 0.51 and actively being maintained...

Thanks for the help.
It works now.