I2C function for 8/16-Bit register width
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i2c function for to read and write camera-sensor registers

"v4l2-dbg"
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v4l2-dbg -?			# help
v4l2-dbg -n			# scan devices

v4l2-dbg -c [subdev-number] -d [videodev (default /dev/video0)]

example: read camera-ID of camera VM-010:
v4l2-dbg -c subdev0 -g 0x00


I2C Tool for set more than 1 register with one call via "register...txt"
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"cam_regs.py"
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./cam_regs.py --help
./cam_regs.py [-s <subdev>] [-d <videodev>] <reg.txt>

example execute register-settings-mt9v02x.txt of VM-010:
./cam_regs.py -s subdev0 -d /dev/video0 ../register-settings-mt9v02x.txt

