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evdev: check for ABS_MT_POSITION_X/Y to determine mt devices

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mtdev as currently used in weston is a noop. mtdev's purpose is to convert
Protocol A devices (without ABS_MT_SLOT) to Protocol B devices (slots).
For Protocol B devices mtdev merely routes the events, so checking for
slots and then using mtdev based on that adds no functionality.

Check for ABS_MT_POSITION_X/Y instead and use that to categorise a device
as MT device. mtdev will provide us with a slotted protocol for all devices.

https://bugs.freedesktop.org/show_bug.cgi?id=54428
This commit is contained in:
Peter Hutterer 2013-08-08 12:03:08 +10:00 • committed by Kristian Høgsberg
parent f3d62276d2
commit 45d659dd82
1 changed files with 5 additions and 1 deletions
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6
src/evdev.c
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@ -454,7 +454,11 @@ evdev_handle_device(struct evdev_device *device)
device->abs.max_y = absinfo.maximum;
device->caps |= EVDEV_MOTION_ABS;
}
if (TEST_BIT(abs_bits, ABS_MT_SLOT)) {
/* We only handle the slotted Protocol B in weston.
Devices with ABS_MT_POSITION_* but not ABS_MT_SLOT
require mtdev for conversion. */
if (TEST_BIT(abs_bits, ABS_MT_POSITION_X) &&
TEST_BIT(abs_bits, ABS_MT_POSITION_Y)) {
ioctl(device->fd, EVIOCGABS(ABS_MT_POSITION_X),
&absinfo);
device->abs.min_x = absinfo.minimum;