HID: multitouch: Release all touch slots on reset_resume (d3e69b9a) · Commits · 戴 / test

When resetting a device (especially after power loss) it is unlikely that the firmware will keep the contact tracking data for the previous touches and will be able to reconcile it with the new contacts, so let's release all slots on reset resume as start anew. Signed-off-by:

Benson Leung <bleung@chromium.org> Signed-off-by:

Dmitry Torokhov <dtor@chromium.org> Reviewed-by:

Benjamin Tissoires <benjamin.tissoires@redhat.com> Signed-off-by:

Jiri Kosina <jkosina@suse.cz>

drivers/hid/hid-multitouch.c

+22 −0

Original line number	Diff line number	Diff line
		@@ -1150,8 +1150,30 @@ static int mt_probe(struct hid_device hdev, const struct hid_device_id id)
		}

		#ifdef CONFIG_PM
		static void mt_release_contacts(struct hid_device *hid)
		{
		struct hid_input *hidinput;

		list_for_each_entry(hidinput, &hid->inputs, list) {
		struct input_dev *input_dev = hidinput->input;
		struct input_mt *mt = input_dev->mt;
		int i;

		if (mt) {
		for (i = 0; i < mt->num_slots; i++) {
		input_mt_slot(input_dev, i);
		input_mt_report_slot_state(input_dev,
		MT_TOOL_FINGER,
		false);
		}
		input_sync(input_dev);
		}
		}
		}

		static int mt_reset_resume(struct hid_device *hdev)
		{
		mt_release_contacts(hdev);
		mt_set_maxcontacts(hdev);
		mt_set_input_mode(hdev);
		return 0;

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