1 files changed, 27 insertions, 3 deletions

diff --git a/drivers/hid/hid-a4tech.c b/drivers/hid/hid-a4tech.c
index 98bf694626f7..3a8c4a5971f7 100644
--- a/drivers/hid/hid-a4tech.c
+++ b/drivers/hid/hid-a4tech.c
@@ -23,12 +23,36 @@
 #define A4_2WHEEL_MOUSE_HACK_7  0x01
 #define A4_2WHEEL_MOUSE_HACK_B8 0x02
 
+#define A4_WHEEL_ORIENTATION    (HID_UP_GENDESK | 0x000000b8)
+
 struct a4tech_sc {
         unsigned long quirks;
         unsigned int hw_wheel;
         __s32 delayed_value;
 };
 
+static int a4_input_mapping(struct hid_device *hdev, struct hid_input *hi,
+                            struct hid_field *field, struct hid_usage *usage,
+                            unsigned long **bit, int *max)
+{
+        struct a4tech_sc *a4 = hid_get_drvdata(hdev);
+
+        if (a4->quirks & A4_2WHEEL_MOUSE_HACK_B8 &&
+            usage->hid == A4_WHEEL_ORIENTATION) {
+                /*
+                 * We do not want to have this usage mapped to anything as it's
+                 * nonstandard and doesn't really behave like an HID report.
+                 * It's only selecting the orientation (vertical/horizontal) of
+                 * the previous mouse wheel report. The input_events will be
+                 * generated once both reports are recorded in a4_event().
+                 */
+                return -1;
+        }
+
+        return 0;
+
+}
+
 static int a4_input_mapped(struct hid_device *hdev, struct hid_input *hi,
                 struct hid_field *field, struct hid_usage *usage,
                 unsigned long **bit, int *max)
@@ -52,8 +76,7 @@ static int a4_event(struct hid_device *hdev, struct hid_field *field,
         struct a4tech_sc *a4 = hid_get_drvdata(hdev);
         struct input_dev *input;
 
-        if (!(hdev->claimed & HID_CLAIMED_INPUT) || !field->hidinput ||
-                        !usage->type)
+        if (!(hdev->claimed & HID_CLAIMED_INPUT) || !field->hidinput)
                 return 0;
 
         input = field->hidinput->input;
@@ -64,7 +87,7 @@ static int a4_event(struct hid_device *hdev, struct hid_field *field,
                         return 1;
                 }
 
-                if (usage->hid == 0x000100b8) {
+                if (usage->hid == A4_WHEEL_ORIENTATION) {
                         input_event(input, EV_REL, value ? REL_HWHEEL :
                                         REL_WHEEL, a4->delayed_value);
                         input_event(input, EV_REL, value ? REL_HWHEEL_HI_RES :
@@ -131,6 +154,7 @@ MODULE_DEVICE_TABLE(hid, a4_devices);
 static struct hid_driver a4_driver = {
         .name = "a4tech",
         .id_table = a4_devices,
+        .input_mapping = a4_input_mapping,
         .input_mapped = a4_input_mapped,
         .event = a4_event,
         .probe = a4_probe,