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Old 02-21-2014, 03:24 PM   #1
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Join Date: Feb 2014
Device: Kobo wifi
Kobo wifi /dev/ntx_io hacking

While examining various system calls that nickel makes I noticed that /dev/ntx_io is accessed a lot. So by looking at the source code for the Linux kernel I worked out what a lot of the ioctl() calls do.

I now have a program that can:
  • Detect if the SD card is inserted.
  • Detect if the SD card is read-only or read-write.
  • Detect if USB is connected.
  • Detect if the power button has just been pressed.
  • Get the battery charge status.
  • Switch on the blue LED.
  • Flash the blue LED once.

The attached is tested on a Wifi ereader with 4-bit display (m166e hardware version), but the source code of the imx357 hardware version (which I think is the 8-bit version) appears very similar.
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