N900 Hardware Flash Torch

The flash torch on the n900 is a two LED flash, which has several modes. It can flash brightly for a maximum of .5s, with an LED current of no more than 320mA, or be in torch mode, at a current of no more than 50mA.

Exceeding these values may cause hardware damage.

It also contains a red indicator light, to indicate video is being recorded.

(See kernel source ./arch/arm/mach-omap2/board-rx51-camera.c for details)

The controls of the device are apparantly presented as video4linux ioctls related to the main camera device - /dev/video0 usually, and should show up in a suitable 'webcam' type viewer that cah show arbitrary video4linux controls.

The driver is in drivers/media/video/adp1653.c