Support mode switches on Intuos Pro and similar devices

[jigpu]

The Intuos Pro is not very different from the EKR in terms of its interface. It has a single touchring and some ExpressKeys exposed behind a "pad" interface in X and has a similar kernel interface for reading / updating the LED state.

See e.g. https://github.com/linuxwacom/xf86-input-wacom/issues/146

[acook]

Could someone point me in the right direction for how to detect the LED state on the Intuos devices?

[denilsonsa]

Intuos5 here. This is the path:

/sys/module/wacom/drivers/hid:wacom/*/wacom_led/

Which contains two pseudo-files:

• status_led0_select - Reads as a value from 0 to 3, depending on the current mode. Writing a value from 0 to 3 will switch to a different mode. (Writing a value outside that range gets wrapped around, i.e. only the lower two bits are considered.)
• status0_luminance - Reads as the current brightness of the mode LED. Was 32 by default on my tablet. Can be written to.
  • Values from 0 to 31 turn the LED off.
  • Values from 32 to 63 have low brightness.
  • Values from 64 to 95 have medium brightness.
  • Values from 96 to 127 have high brightness.
  • Values beyond that just wrap around.

I don't see any way to adjust the brightness of the "active area markers". (Pages 7 and 76 from the user's manual.) Maybe the driver doesn't support it? (I've never tried this tablet on a Windows machine, I don't even know if that's possible.)

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Semi-related project: sanette/intuos4-oled, which displays images on the Intuos4 built-in oled screens. It also has code to access status_led0_select.