Acer ACR010 webcam in Linux

Acer ACR010

$ lsusb
ID 0c45:637d Microdia ACR010 USB Webcam

If you encounter protocol errors ie:

$ fswebcam -r 640x480 /tmp/lastsnap.jpg
--- Opening /dev/video0...
Trying source module v4l2...
/dev/video0 opened.
No input was specified, using the first.
Error starting stream.
VIDIOC_STREAMON: Protocol error
Unable to use mmap. Using read instead.
Unable to use read.

try connecting the webcam directly to computer instead of usb hub.

V4l2 info:

~$ v4l2-ctl --list-formats-ext -d 0
ioctl: VIDIOC_ENUM_FMT
        Type: Video Capture

        [0]: 'MJPG' (Motion-JPEG, compressed)
                Size: Discrete 2560x1920
                        Interval: Discrete 0.033s (30.000 fps)
                Size: Discrete 2592x1944
                        Interval: Discrete 0.033s (30.000 fps)
                Size: Discrete 2048x1536
                        Interval: Discrete 0.033s (30.000 fps)
                Size: Discrete 1920x1080
                        Interval: Discrete 0.033s (30.000 fps)
                Size: Discrete 1280x960
                        Interval: Discrete 0.033s (30.000 fps)
                Size: Discrete 1280x720
                        Interval: Discrete 0.033s (30.000 fps)
                Size: Discrete 1024x768
                        Interval: Discrete 0.033s (30.000 fps)
                Size: Discrete 800x600
                        Interval: Discrete 0.033s (30.000 fps)
                Size: Discrete 640x480
                        Interval: Discrete 0.033s (30.000 fps)
                Size: Discrete 320x240
                        Interval: Discrete 0.033s (30.000 fps)
        [1]: 'YUYV' (YUYV 4:2:2)
                Size: Discrete 2560x1920
                        Interval: Discrete 0.500s (2.000 fps)
                Size: Discrete 2592x1944
                        Interval: Discrete 0.500s (2.000 fps)
                Size: Discrete 2048x1536
                        Interval: Discrete 0.200s (5.000 fps)
                Size: Discrete 1920x1080
                        Interval: Discrete 0.200s (5.000 fps)
                Size: Discrete 1280x960
                        Interval: Discrete 0.200s (5.000 fps)
                Size: Discrete 1280x720
                        Interval: Discrete 0.100s (10.000 fps)
                Size: Discrete 1024x768
                        Interval: Discrete 0.067s (15.000 fps)
                Size: Discrete 800x600
                        Interval: Discrete 0.050s (20.000 fps)
                Size: Discrete 640x480
                        Interval: Discrete 0.033s (30.000 fps)
                Size: Discrete 320x240
                        Interval: Discrete 0.033s (30.000 fps)

Creative Webcam NX Pro 2

$ lsusb
ID 041e:403a Creative Technology, Ltd Webcam NX Pro 2

$ v4l2-ctl --list-formats-ext -d 2
ioctl: VIDIOC_ENUM_FMT
        Type: Video Capture

        [0]: 'JPEG' (JFIF JPEG, compressed)
                Size: Discrete 320x240
                Size: Discrete 640x480