[v3,5/9] HID: multitouch: take cls->maxcontacts into account for devices without a HID_DG_CONTACTMAX field too

Commit Message

Aditya Garg Aug. 8, 2024, 1:53 p.m. UTC

From: Kerem Karabay <[e-mail]>

This is needed for Apple Touch Bars, where no HID_DG_CONTACTMAX field is
present and the maximum contact count is greater than the default.

Signed-off-by: Kerem Karabay <[e-mail]>
Signed-off-by: Aditya Garg <[e-mail]>
---
 drivers/hid/hid-multitouch.c | 7 ++++---
 1 file changed, 4 insertions(+), 3 deletions(-)

Patch

diff --git a/drivers/hid/hid-multitouch.c b/drivers/hid/hid-multitouch.c
index 571435da5..60b675cd1 100644
--- a/drivers/hid/hid-multitouch.c
+++ b/drivers/hid/hid-multitouch.c
@@ -490,9 +490,6 @@  static void mt_feature_mapping(struct hid_device *hdev,
 		if (!td->maxcontacts &&
 		    field->logical_maximum <= MT_MAX_MAXCONTACT)
 			td->maxcontacts = field->logical_maximum;
-		if (td->mtclass.maxcontacts)
-			/* check if the maxcontacts is given by the class */
-			td->maxcontacts = td->mtclass.maxcontacts;
 
 		break;
 	case HID_DG_BUTTONTYPE:
@@ -1309,6 +1306,10 @@  static int mt_touch_input_configured(struct hid_device *hdev,
 	struct input_dev *input = hi->input;
 	int ret;
 
+	/* check if the maxcontacts is given by the class */
+	if (cls->maxcontacts)
+		td->maxcontacts = cls->maxcontacts;
+
 	if (!td->maxcontacts)
 		td->maxcontacts = MT_DEFAULT_MAXCONTACT;