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evdev: parse LIBINPUT_ATTR_RESOLUTION_HINT

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For Elantech touchpads, we know that the resolution is 31u/mm (800dpi) for
v1-v3 firmware. Set this as a hint until we get either the kernel or systemd
to set this for us.

Signed-off-by: Peter Hutterer <peter.hutterer@who-t.net>
This commit is contained in:
Peter Hutterer 2015-07-10 13:59:06 +10:00
parent a78efc0e2c
commit a13d936d74
2 changed files with 27 additions and 3 deletions
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24
src/evdev.c
View file

@ -1551,6 +1551,23 @@ evdev_read_model(struct evdev_device *device)
return m->model;
}
static inline int
evdev_read_attr_res_prop(struct evdev_device *device,
size_t *xres,
size_t *yres)
{
struct udev_device *udev;
const char *res_prop;
udev = device->udev_device;
res_prop = udev_device_get_property_value(udev,
"LIBINPUT_ATTR_RESOLUTION_HINT");
if (!res_prop)
return false;
return parse_dimension_property(res_prop, xres, yres);
}
static inline int
evdev_read_attr_size_prop(struct evdev_device *device,
size_t *size_x,
@ -1578,8 +1595,8 @@ evdev_fix_abs_resolution(struct evdev_device *device,
struct libevdev *evdev = device->evdev;
const struct input_absinfo *absx, *absy;
size_t widthmm = 0, heightmm = 0;
int xres = EVDEV_FAKE_RESOLUTION,
yres = EVDEV_FAKE_RESOLUTION;
size_t xres = EVDEV_FAKE_RESOLUTION,
yres = EVDEV_FAKE_RESOLUTION;
if (!(xcode == ABS_X && ycode == ABS_Y) &&
!(xcode == ABS_MT_POSITION_X && ycode == ABS_MT_POSITION_Y)) {
@ -1600,7 +1617,8 @@ evdev_fix_abs_resolution(struct evdev_device *device,
* property is only for general size hints where we can make
* educated guesses but don't know better.
*/
if (evdev_read_attr_size_prop(device, &widthmm, &heightmm)) {
if (!evdev_read_attr_res_prop(device, &xres, &yres) &&
evdev_read_attr_size_prop(device, &widthmm, &heightmm)) {
xres = (absx->maximum - absx->minimum)/widthmm;
yres = (absy->maximum - absy->minimum)/heightmm;
}

6
udev/90-libinput-model-quirks.hwdb
View file

@ -34,6 +34,12 @@ libinput:touchpad:input:b0005v05ACp*
LIBINPUT_MODEL_APPLE_TOUCHPAD=1
LIBINPUT_ATTR_SIZE_HINT=104x75
##########################################
# Elantech
##########################################
libinput:name:*ETPS/2 Elantech Touchpad*:dmi:*
LIBINPUT_ATTR_RESOLUTION_HINT=31x31
##########################################
# Google
##########################################