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evdev: use LIBINPUT_ATTR_SIZE_HINT for resolutions

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Touchpads, notably Elantech, ALPS and bcm5974 don't provide x/y resolution
until recent generations.
Add a new property, LIBINPUT_ATTR_SIZE_HINT, that provides size information to
libinput. Note that this property *does not* override true resolution values,
it is only used when the resolution is missing. It is used merely as an
approximate size hint.

If the resolution for a specific device is known it should be added to the
udev hwdb so it can be set globally. See the bcm5974 entries here:
http://cgit.freedesktop.org/systemd/systemd/tree/hwdb/60-evdev.hwdb.

Signed-off-by: Peter Hutterer <peter.hutterer@who-t.net>
Reviewed-by: Hans de Goede <hdegoede@redhat.com>
This commit is contained in:
Peter Hutterer 2015-06-30 12:15:12 +10:00
parent 5bebd4aea4
commit a4f5abd18e
2 changed files with 43 additions and 7 deletions
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14
doc/device-configuration-via-udev.dox
View file

@ -67,6 +67,10 @@ to normalize them.
<dd><b>This prefix is reserved as private API, do not use.</b>. See @ref
model_specific_configuration for details.
</dd>
<dt>LIBINPUT_ATTR_*</dt>
<dd><b>This prefix is reserved as private API, do not use.</b>. See @ref
model_specific_configuration for details.
</dd>
</dl>
Below is an example udev rule to assign "seat1" to a device from vendor
@ -103,13 +107,13 @@ ENV{ID_MODEL_ID}=="034b", ENV{ID_INPUT_TOUCHPAD}="", ENV{ID_INPUT_TABLET}="1"
@section model_specific_configuration Model-specific configuration
libinput reserves the property prefix <b>LIBINPUT_MODEL_</b> for
model-specific configuration. <b>This prefix is reserved as private API, do
not use.</b>
libinput reserves the property prefixes <b>LIBINPUT_MODEL_</b> and
<b>LIBINPUT_ATTR_*</b> for model-specific configuration. <b>These prefixes
are reserved as private API, do not use.</b>
The effect of this property may be to enable or disable certain
The effect of these properties may be to enable or disable certain
features on a specific device or set of devices, to change configuration
defaults or any other reason. The effects of setting this property, the
defaults or any other reason. The effects of setting these properties, the
format of the property and the value of the property are subject to change
at any time.

36
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_size_prop(struct evdev_device *device,
size_t *size_x,
size_t *size_y)
{
struct udev_device *udev;
const char *size_prop;
udev = device->udev_device;
size_prop = udev_device_get_property_value(udev,
"LIBINPUT_ATTR_SIZE_HINT");
if (!size_prop)
return false;
return parse_dimension_property(size_prop, size_x, size_y);
}
/* Return 1 if the device is set to the fake resolution or 0 otherwise */
static inline int
evdev_fix_abs_resolution(struct evdev_device *device,
@ -1559,6 +1576,8 @@ evdev_fix_abs_resolution(struct evdev_device *device,
{
struct libinput *libinput = device->base.seat->libinput;
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;
@ -1570,15 +1589,28 @@ evdev_fix_abs_resolution(struct evdev_device *device,
return 0;
}
if (libevdev_get_abs_resolution(evdev, xcode) != 0)
absx = libevdev_get_abs_info(evdev, xcode);
absy = libevdev_get_abs_info(evdev, ycode);
if (absx->resolution != 0 || absy->resolution != 0)
return 0;
/* Note: we *do not* override resolutions if provided by the kernel.
* If a device needs this, add it to 60-evdev.hwdb. The libinput
* 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)) {
xres = (absx->maximum - absx->minimum)/widthmm;
yres = (absy->maximum - absy->minimum)/heightmm;
}
/* libevdev_set_abs_resolution() changes the absinfo we already
have a pointer to, no need to fetch it again */
libevdev_set_abs_resolution(evdev, xcode, xres);
libevdev_set_abs_resolution(evdev, ycode, yres);
return 1;
return xres == EVDEV_FAKE_RESOLUTION;
}
static enum evdev_device_udev_tags