[PATCH 51/51] Input: atmel_mxt_ts - Only use first T9 instance

[Nick Dyer]

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@xxxxxxxxxxx>
Acked-by: Benson Leung <bleung@xxxxxxxxxxxx>
---
 drivers/input/touchscreen/atmel_mxt_ts.c |   13 +++++++------
 1 file changed, 7 insertions(+), 6 deletions(-)

diff --git a/drivers/input/touchscreen/atmel_mxt_ts.c b/drivers/input/touchscreen/atmel_mxt_ts.c
index 9a5ac2c..7380a40 100644
--- a/drivers/input/touchscreen/atmel_mxt_ts.c
+++ b/drivers/input/touchscreen/atmel_mxt_ts.c
@@ -1770,10 +1770,11 @@ static int mxt_parse_object_table(struct mxt_data *data)
 			data->T7_address = object->start_address;
 			break;
 		case 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_TOUCH_KEYARRAY_T15:
 			data->T15_reportid_min = min_id;
@@ -1796,10 +1797,10 @@ static int mxt_parse_object_table(struct mxt_data *data)
 			data->T48_reportid = min_id;
 			break;
 		case MXT_PROCI_ACTIVE_STYLUS_T63:
+			/* Only handle messages from first T63 instance */
 			data->T63_reportid_min = min_id;
-			data->T63_reportid_max = max_id;
-			data->num_stylusids = object->num_report_ids
-						* mxt_obj_instances(object);
+			data->T63_reportid_max = min_id;
+			data->num_stylusids = 1;
 			break;
 		case MXT_TOUCH_MULTITOUCHSCREEN_T100:
 			data->T100_reportid_min = min_id;
-- 
1.7.10.4

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