Re: [PATCH] Documentation: input: define ABS_PRESSURE/ABS_MT_PRESSURE resolution as grams

2021-01-28 Thread Jonathan Corbet
On Wed, 13 Jan 2021 09:03:10 +1000 Peter Hutterer wrote: > ABS_PRESSURE and ABS_MT_PRESSURE on touch devices usually represent > contact size (as a finger flattens with higher pressure the contact size > increases) and userspace translates the kernel pressure value back into > contact size. For

Re: [PATCH] Documentation: input: define ABS_PRESSURE/ABS_MT_PRESSURE resolution as grams

2021-01-13 Thread Benjamin Tissoires
On Wed, Jan 13, 2021 at 12:03 AM Peter Hutterer wrote: > > ABS_PRESSURE and ABS_MT_PRESSURE on touch devices usually represent > contact size (as a finger flattens with higher pressure the contact size > increases) and userspace translates the kernel pressure value back into > contact size. For

[PATCH] Documentation: input: define ABS_PRESSURE/ABS_MT_PRESSURE resolution as grams

2021-01-12 Thread Peter Hutterer
ABS_PRESSURE and ABS_MT_PRESSURE on touch devices usually represent contact size (as a finger flattens with higher pressure the contact size increases) and userspace translates the kernel pressure value back into contact size. For example, libinput has pressure thresholds when a touch is