Comment 1 by Nikolaus Schaller, Mar 30, 2014
And from here which shows how to integrate a flash/torch driver into V4L2: http://lxr.free-electrons.com/source/drivers/media/i2c/adp1653.c
Comment 2 by Nikolaus Schaller, Oct 29, 2017
Another hint how to integrate int V4L2: https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git/co mmit/?id=503dd28af108888c505e8d6a86f4acf5eb20f3b7
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Reported by Nikolaus Schaller, Jan 31, 2013