mirror of
https://gitlab.freedesktop.org/libinput/libinput.git
synced 2025-12-20 16:10:06 +01:00
2b2a1b0eb9
The easiest way to get a device group is by looking at the phys path of the
input device (which looks like usb-0000:00:14.0-1/input1) and dropping the
/inputX bit. The rest is the same for devices that belong together (except on
the Cintiq 22HD Touch).
Ideally we could just take ATTRS{phys} but we can't select substrings to drop
into ENV so we need to do it ourselves. This patch adds a callout that takes a
syspath and prints the mangled path, to be used in LIBINPUT_DEVICE_GROUP.
The rule triggers on any device that has a non-zero phys attribute, this
groups devices like tablets together but also devices like mice with multiple
interfaces.
Signed-off-by: Peter Hutterer <peter.hutterer@who-t.net>
Tested-by: Benjamin Tissoires <benjamin.tissoires@gmail.com>
77 lines
1.4 KiB
C
77 lines
1.4 KiB
C
#include <stdio.h>
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#include <stdlib.h>
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#include <string.h>
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#include <libudev.h>
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int main(int argc, char **argv)
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{
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int rc = 1;
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struct udev *udev = NULL;
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struct udev_device *device = NULL;
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const char *syspath,
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*phys = NULL;
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char *group,
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*str;
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if (argc != 2)
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return 1;
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syspath = argv[1];
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udev = udev_new();
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if (!udev)
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goto out;
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device = udev_device_new_from_syspath(udev, syspath);
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if (!device)
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goto out;
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/* Find the first parent with ATTRS{phys} set. For tablets that
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* value looks like usb-0000:00:14.0-1/input1. Drop the /input1
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* bit and use the remainder as device group identifier */
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while (device != NULL) {
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struct udev_device *parent;
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phys = udev_device_get_sysattr_value(device, "phys");
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if (phys)
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break;
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parent = udev_device_get_parent(device);
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udev_device_ref(parent);
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udev_device_unref(device);
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device = parent;
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}
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if (!phys)
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goto out;
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group = strdup(phys);
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if (!group)
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goto out;
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str = strstr(group, "/input");
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if (str)
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*str = '\0';
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/* Cintiq 22HD Touch has
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usb-0000:00:14.0-6.3.1/input0 for the touch
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usb-0000:00:14.0-6.3.0/input0 for the pen
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Check if there's a . after the last -, if so, cut off the string
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there.
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*/
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str = strrchr(group, '.');
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if (str && str > strrchr(group, '-'))
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*str = '\0';
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printf("%s\n", group);
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free(group);
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rc = 0;
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out:
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if (device)
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udev_device_unref(device);
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if (udev)
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udev_unref(udev);
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return rc;
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}
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