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authorNick Dyer <nick.dyer@itdev.co.uk>2018-07-27 21:44:20 +0300
committerDmitry Torokhov <dmitry.torokhov@gmail.com>2018-07-27 21:59:28 +0300
commit36f5d9ef26e52edff046b4b097855db89bf0cd4a (patch)
tree0cd19fab7c302c5a46faf8cf88a8d8253d615634 /drivers/input
parent53fddb6618db53779d96f6a29a98e2a9c5d05877 (diff)
downloadlinux-36f5d9ef26e52edff046b4b097855db89bf0cd4a.tar.xz
Input: atmel_mxt_ts - only use first T9 instance
The driver only registers one input device, which uses the screen parameters from the first T9 instance. The first T63 instance also uses those parameters. It is incorrect to send input reports from the second instances of these objects if they are enabled: the input scaling will be wrong and the positions will be mashed together. This also causes problems on Android if the number of slots exceeds 32. In the future, this could be handled by looking for enabled touch object instances and creating an input device for each one. Signed-off-by: Nick Dyer <nick.dyer@itdev.co.uk> Acked-by: Benson Leung <bleung@chromium.org> Acked-by: Yufeng Shen <miletus@chromium.org> Signed-off-by: Dmitry Torokhov <dmitry.torokhov@gmail.com>
Diffstat (limited to 'drivers/input')
-rw-r--r--drivers/input/touchscreen/atmel_mxt_ts.c7
1 files changed, 4 insertions, 3 deletions
diff --git a/drivers/input/touchscreen/atmel_mxt_ts.c b/drivers/input/touchscreen/atmel_mxt_ts.c
index 54fe190fd4bc..48c5ccab00a0 100644
--- a/drivers/input/touchscreen/atmel_mxt_ts.c
+++ b/drivers/input/touchscreen/atmel_mxt_ts.c
@@ -1658,10 +1658,11 @@ static int mxt_parse_object_table(struct mxt_data *data,
break;
case MXT_TOUCH_MULTI_T9:
data->multitouch = MXT_TOUCH_MULTI_T9;
+ /* Only handle messages from first T9 instance */
data->T9_reportid_min = min_id;
- data->T9_reportid_max = max_id;
- data->num_touchids = object->num_report_ids
- * mxt_obj_instances(object);
+ data->T9_reportid_max = min_id +
+ object->num_report_ids - 1;
+ data->num_touchids = object->num_report_ids;
break;
case MXT_SPT_MESSAGECOUNT_T44:
data->T44_address = object->start_address;