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authorJason Gerecke <killertofu@gmail.com>2015-10-07 16:54:21 -0700
committerJiri Kosina <jkosina@suse.cz>2015-10-21 13:13:11 +0200
commit499522c8c015de995aabce3d0f0bf4b9b17f44c3 (patch)
tree71ee15c9be4502d28e4618e7316ce29299f606a7 /drivers/hid
parente8e88438008375b17561dcc6a22abc24decf04ac (diff)
HID: wacom: Tie cached HID_DG_CONTACTCOUNT indices to report ID
The cached indicies 'cc_index' and 'cc_value_index' introduced in 1b5d514 are only valid for a single report ID. If a touchscreen has multiple reports with a HID_DG_CONTACTCOUNT usage, its possible that the values will not be correct for the report we're handling, resulting in an incorrect value for 'num_expected'. This has been observed with the Cintiq Companion 2. To address this, we store the ID of the report those indicies are valid for in a new 'cc_report' variable. Before using them to get the expected contact count, we first check if the ID of the report we're processing matches 'cc_report'. If it doesn't, we update the indicies to point to the HID_DG_CONTACTCOUNT usage of the current report (if it has one). Cc: stable@vger.kernel.org Signed-off-by: Jason Gerecke <jason.gerecke@wacom.com> Signed-off-by: Jiri Kosina <jkosina@suse.cz>
Diffstat (limited to 'drivers/hid')
-rw-r--r--drivers/hid/wacom_wac.c26
-rw-r--r--drivers/hid/wacom_wac.h1
2 files changed, 27 insertions, 0 deletions
diff --git a/drivers/hid/wacom_wac.c b/drivers/hid/wacom_wac.c
index 0215ab62bb93..9c3b14496c97 100644
--- a/drivers/hid/wacom_wac.c
+++ b/drivers/hid/wacom_wac.c
@@ -1628,6 +1628,7 @@ static void wacom_wac_finger_usage_mapping(struct hid_device *hdev,
wacom_map_usage(input, usage, field, EV_KEY, BTN_TOUCH, 0);
break;
case HID_DG_CONTACTCOUNT:
+ wacom_wac->hid_data.cc_report = field->report->id;
wacom_wac->hid_data.cc_index = field->index;
wacom_wac->hid_data.cc_value_index = usage->usage_index;
break;
@@ -1715,6 +1716,31 @@ static void wacom_wac_finger_pre_report(struct hid_device *hdev,
struct wacom_wac *wacom_wac = &wacom->wacom_wac;
struct hid_data* hid_data = &wacom_wac->hid_data;
+ if (hid_data->cc_report != 0 &&
+ hid_data->cc_report != report->id) {
+ int i;
+
+ hid_data->cc_report = report->id;
+ hid_data->cc_index = -1;
+ hid_data->cc_value_index = -1;
+
+ for (i = 0; i < report->maxfield; i++) {
+ struct hid_field *field = report->field[i];
+ int j;
+
+ for (j = 0; j < field->maxusage; j++) {
+ if (field->usage[j].hid == HID_DG_CONTACTCOUNT) {
+ hid_data->cc_index = i;
+ hid_data->cc_value_index = j;
+
+ /* break */
+ i = report->maxfield;
+ j = field->maxusage;
+ }
+ }
+ }
+ }
+
if (hid_data->cc_index >= 0) {
struct hid_field *field = report->field[hid_data->cc_index];
int value = field->value[hid_data->cc_value_index];
diff --git a/drivers/hid/wacom_wac.h b/drivers/hid/wacom_wac.h
index 1e270d401e18..809c03e34f74 100644
--- a/drivers/hid/wacom_wac.h
+++ b/drivers/hid/wacom_wac.h
@@ -198,6 +198,7 @@ struct hid_data {
int width;
int height;
int id;
+ int cc_report;
int cc_index;
int cc_value_index;
int num_expected;