[PATCH 3/3] selftests/hid: sync python tests to hid-tools 0.10

[Benjamin Tissoires <bentiss@kernel.org>]

hid-tools 0.10 fixes one inconvenience introduced by
commit 6a9e76f75c1a ("HID: multitouch: Disable touchpad
on firmware level while not in use")

This change added a new callback when a hid-nultitouch device is opened
or closed to put the underlying device into a given operating mode.
However, in the test cases, that means that while the single threaded
test is run, it opens the device but has to react to the device while
the open() is still running. hid-tools now implements a minimal thread
to circumvent this.

This makes the HID kernel tests in sync with hid-tools 0.10.

This has the net effect of running the full HID python testsuite in 6
minutes instead of 1 hour.

Signed-off-by: Benjamin Tissoires <bentiss@kernel.org>
---
 tools/testing/selftests/hid/tests/base_device.py | 19 +++++++++++++++++++
 1 file changed, 19 insertions(+)

diff --git a/tools/testing/selftests/hid/tests/base_device.py b/tools/testing/selftests/hid/tests/base_device.py
index e13035fe1deb4c2ee5fd729d43c619bdd759c138..59465c58d94dfd3993ae87b25a62e444e93e0f66 100644
--- a/tools/testing/selftests/hid/tests/base_device.py
+++ b/tools/testing/selftests/hid/tests/base_device.py
@@ -23,6 +23,7 @@ import fcntl
 import functools
 import libevdev
 import os
+import threading
 
 try:
     import pyudev
@@ -344,10 +345,28 @@ class BaseDevice(UHIDDevice):
         if not self.kernel_is_ready or not self.started:
             return []
 
+        # Starting with kernel v6.16, an event is emitted when
+        # userspace opens a kernel device, and for some devices
+        # this translates into a SET_REPORT.
+        # Because EvdevDevice(path) opens every single evdev node
+        # we need to have a separate thread to process the incoming
+        # SET_REPORT or we end up having to wait for the kernel
+        # timeout of 5 seconds.
+        done = False
+
+        def dispatch():
+            while not done:
+                self.dispatch(1)
+
+        t = threading.Thread(target=dispatch)
+        t.start()
+
         self._input_nodes = [
             EvdevDevice(path)
             for path in self.walk_sysfs("input", "input/input*/event*")
         ]
+        done = True
+        t.join()
         return self._input_nodes
 
     def match_evdev_rule(self, application, evdev):

-- 
2.49.0