[Nexus 7 (2013) General] vbtalent:
making very little progress but I think I know what's going on.. the USB device is being loaded as /dev/video3 and not as /dev/video0 which I assume is what most applications are looking for.

This was me plugging and unplugging the camera. I believe this also tells me that the kernel already is set for the camera.

root@flo:/ # ls -l /dev/v*

crw-rw---- system camera 81, 1 2014-04-22 21:54 v4l-subdev0

crw-rw---- system camera 81, 2 2014-04-22 21:54 v4l-subdev1

crw-rw---- system camera 81, 3 2014-04-22 21:54 v4l-subdev2

crw-rw---- system camera 81, 4 2014-04-22 21:54 v4l-subdev3

crw-rw---- system camera 81, 5 2014-04-22 21:54 v4l-subdev4

crw-rw---- system camera 81, 7 2014-04-22 21:54 v4l-subdev5

crw-rw---- system camera 81, 9 2014-04-22 21:54 v4l-subdev6

crw-rw---- system camera 81, 10 2014-04-22 21:54 v4l-subdev7

crw-rw---- system camera 81, 11 2014-04-22 21:54 v4l-subdev8

crw-rw---- system camera 81, 12 2014-04-22 21:54 v4l-subdev9

crw------- root root 7, 0 2014-04-22 21:54 vcs

crw------- root root 7, 1 2014-04-22 21:54 vcs1

crw------- root root 7, 128 2014-04-22 21:54 vcsa

crw------- root root 7, 129 2014-04-22 21:54 vcsa1

crw------- root root 10, 127 2014-04-22 21:54 vga_arbiter

crw-rw---- system camera 81, 0 2014-04-22 21:54 video0

crw-rw---- system camera 81, 6 2014-04-22 21:54 video1

crw-rw---- system camera 81, 8 2014-04-22 21:54 video2

root@flo:/ # ls -l /dev/v*

crw-rw---- system camera 81, 1 2014-04-22 21:54 v4l-subdev0

crw-rw---- system camera 81, 2 2014-04-22 21:54 v4l-subdev1

crw-rw---- system camera 81, 3 2014-04-22 21:54 v4l-subdev2

crw-rw---- system camera 81, 4 2014-04-22 21:54 v4l-subdev3

crw-rw---- system camera 81, 5 2014-04-22 21:54 v4l-subdev4

crw-rw---- system camera 81, 7 2014-04-22 21:54 v4l-subdev5

crw-rw---- system camera 81, 9 2014-04-22 21:54 v4l-subdev6

crw-rw---- system camera 81, 10 2014-04-22 21:54 v4l-subdev7

crw-rw---- system camera 81, 11 2014-04-22 21:54 v4l-subdev8

crw-rw---- system camera 81, 12 2014-04-22 21:54 v4l-subdev9

crw------- root root 7, 0 2014-04-22 21:54 vcs

crw------- root root 7, 1 2014-04-22 21:54 vcs1

crw------- root root 7, 128 2014-04-22 21:54 vcsa

crw------- root root 7, 129 2014-04-22 21:54 vcsa1

crw------- root root 10, 127 2014-04-22 21:54 vga_arbiter

crw-rw---- system camera 81, 0 2014-04-22 21:54 video0

crw-rw---- system camera 81, 6 2014-04-22 21:54 video1

crw-rw---- system camera 81, 8 2014-04-22 21:54 video2

crw-rw---- system camera 81, 14 2014-04-22 21:56 video3

root@flo:/ # ls -l /dev/v*

crw-rw---- system camera 81, 1 2014-04-22 21:54 v4l-subdev0

crw-rw---- system camera 81, 2 2014-04-22 21:54 v4l-subdev1

crw-rw---- system camera 81, 3 2014-04-22 21:54 v4l-subdev2

crw-rw---- system camera 81, 4 2014-04-22 21:54 v4l-subdev3

crw-rw---- system camera 81, 5 2014-04-22 21:54 v4l-subdev4

crw-rw---- system camera 81, 7 2014-04-22 21:54 v4l-subdev5

crw-rw---- system camera 81, 9 2014-04-22 21:54 v4l-subdev6

crw-rw---- system camera 81, 10 2014-04-22 21:54 v4l-subdev7

crw-rw---- system camera 81, 11 2014-04-22 21:54 v4l-subdev8

crw-rw---- system camera 81, 12 2014-04-22 21:54 v4l-subdev9

crw------- root root 7, 0 2014-04-22 21:54 vcs

crw------- root root 7, 1 2014-04-22 21:54 vcs1

crw------- root root 7, 128 2014-04-22 21:54 vcsa

crw------- root root 7, 129 2014-04-22 21:54 vcsa1

crw------- root root 10, 127 2014-04-22 21:54 vga_arbiter

crw-rw---- system camera 81, 0 2014-04-22 21:54 video0

crw-rw---- system camera 81, 6 2014-04-22 21:54 video1

crw-rw---- system camera 81, 8 2014-04-22 21:54 video2

root@flo:/ #