Not sure about the Kobo Touch.
The Kobo H2O has a MAX17135 sensor. Or at least, that's the only sensor driver enabled in the kernel.
Quote:
https://www.maximintegrated.com/en/p.../MAX17135.html
The IC includes a temperature sensor that provides the ability to read the internal IC temperature and an external panel temperature with the use of an external temperature-sensing diode. Temperature output data is supplied through I²C.
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Sounds good, but I don't know if you can actually query a temperature using that.
There actually is a /sys/devices/platform/mxc_epdc_fb/graphics/fb0/temperature and it says 23 for me which happened to be the room temperature... but I just put it out in the cold and it still says 23 so... maybe something else after all.
lm-sensors doesn't find anything.
PS: it did go down to 22 while writing this post.