HID: uclogic: Handle wireless device reconnection

UGEEv2 tablets with battery can be connected using a USB cable or a USB
Bluetooth dongle.

When the Bluetooth dongle is used, the connection to that tablet can be
lost because the tablet is out of the range of the receiver or because
it was switched off using the switch placed in the back of the tablet's
frame.

After losing connection, the tablet is able to reconnect automatically
and its firmware sends a special packet indicating that the device was
reconnected. In response to this packet, the tablet needs to receive the
same array of magic data it expects on probe to enable its interfaces.

This patch implements a generic mechanism to hook raw events and
schedule a work to perform any custom action.

Tested-by: Mia Kanashi <chad@redpilled.dev>
Tested-by: Andreas Grosse <andig.mail@t-online.de>
Signed-off-by: José Expósito <jose.exposito89@gmail.com>
Signed-off-by: Jiri Kosina <jkosina@suse.cz>

1 files changed, 16 insertions, 0 deletions

diff --git a/drivers/hid/hid-uclogic-params-test.c b/drivers/hid/hid-uclogic-params-test.c
index bfa7ccb7d1e8..678f50cbb160 100644
--- a/drivers/hid/hid-uclogic-params-test.c
+++ b/drivers/hid/hid-uclogic-params-test.c
@@ -174,9 +174,25 @@ static void hid_test_uclogic_parse_ugee_v2_desc(struct kunit *test)
 	KUNIT_EXPECT_EQ(test, params->frame_type, frame_type);
 }
 
+static void hid_test_uclogic_params_cleanup_event_hooks(struct kunit *test)
+{
+	int res, n;
+	struct uclogic_params p = {0, };
+
+	res = uclogic_params_ugee_v2_init_event_hooks(NULL, &p);
+	KUNIT_ASSERT_EQ(test, res, 0);
+
+	/* Check that the function can be called repeatedly */
+	for (n = 0; n < 4; n++) {
+		uclogic_params_cleanup_event_hooks(&p);
+		KUNIT_EXPECT_PTR_EQ(test, p.event_hooks, NULL);
+	}
+}
+
 static struct kunit_case hid_uclogic_params_test_cases[] = {
 	KUNIT_CASE_PARAM(hid_test_uclogic_parse_ugee_v2_desc,
 			 uclogic_parse_ugee_v2_desc_gen_params),
+	KUNIT_CASE(hid_test_uclogic_params_cleanup_event_hooks),
 	{}
 };