HID: hid-input quirk for BTC 8193

BTC 8193 keyboard handles its scrollwheel in very non-standard way.
It produces two non-standard usages for scrolling up and down, in
both cases with postive value equaling to 1. We handle this by temporary
mapping, which we then catch in quirk event handler, and remap to
negative HWHEEL even in order to introduce correct behavior.

Also the button requires special mapping, as it triggers standard-violating
usage code.

Reported in kernel.org bugzilla #9385

Reported-by: Kir Kolyshkin <kir@sacred.ru>
Signed-off-by: Jiri Kosina <jkosina@suse.cz>

1 files changed, 34 insertions, 0 deletions

diff --git a/drivers/hid/hid-input-quirks.c b/drivers/hid/hid-input-quirks.c
index 7f2f80b00d74..e378b4a5eeac 100644
--- a/drivers/hid/hid-input-quirks.c
+++ b/drivers/hid/hid-input-quirks.c
@@ -253,6 +253,27 @@ static int quirk_cherry_genius_29e(struct hid_usage *usage, struct input_dev *in
         return 1;
 }
 
+static int quirk_btc_8193(struct hid_usage *usage, struct input_dev *input,
+                              unsigned long *bit, int *max)
+{
+        if ((usage->hid & HID_USAGE_PAGE) != HID_UP_CONSUMER)
+                return 0;
+
+        switch (usage->hid & HID_USAGE) {
+                case 0x230: map_key(BTN_MOUSE);                 break;
+                case 0x231: map_rel(REL_WHEEL);                 break;
+                /* 
+                 * this keyboard has a scrollwheel implemented in
+                 * totally broken way. We map this usage temporarily
+                 * to HWHEEL and handle it in the event quirk handler
+                 */
+                case 0x232: map_rel(REL_HWHEEL);                break;
+
+                default:
+                        return 0;
+        }
+        return 1;
+}
 
 #define VENDOR_ID_BELKIN                        0x1020
 #define DEVICE_ID_BELKIN_WIRELESS_KEYBOARD      0x0006
@@ -263,6 +284,9 @@ static int quirk_cherry_genius_29e(struct hid_usage *usage, struct input_dev *in
 #define VENDOR_ID_CHICONY                       0x04f2
 #define DEVICE_ID_CHICONY_TACTICAL_PAD          0x0418
 
+#define VENDOR_ID_EZKEY                         0x0518
+#define DEVICE_ID_BTC_8193                      0x0002
+
 #define VENDOR_ID_LOGITECH                      0x046d
 #define DEVICE_ID_LOGITECH_RECEIVER             0xc101
 #define DEVICE_ID_S510_RECEIVER                 0xc50c
@@ -291,6 +315,8 @@ static const struct hid_input_blacklist {
 
         { VENDOR_ID_CHICONY, DEVICE_ID_CHICONY_TACTICAL_PAD, quirk_chicony_tactical_pad },
 
+        { VENDOR_ID_EZKEY, DEVICE_ID_BTC_8193, quirk_btc_8193 },
+
         { VENDOR_ID_LOGITECH, DEVICE_ID_LOGITECH_RECEIVER, quirk_logitech_ultrax_remote },
         { VENDOR_ID_LOGITECH, DEVICE_ID_S510_RECEIVER, quirk_logitech_wireless },
         { VENDOR_ID_LOGITECH, DEVICE_ID_S510_RECEIVER_2, quirk_logitech_wireless },
@@ -323,6 +349,7 @@ int hidinput_mapping_quirks(struct hid_usage *usage,
         return 0;
 }
 
+#define IS_BTC8193(x) (x->vendor == 0x0518 && x->product == 0x0002)
 #define IS_MS_KB(x) (x->vendor == 0x045e && (x->product == 0x00db || x->product == 0x00f9))
 
 void hidinput_event_quirks(struct hid_device *hid, struct hid_field *field, struct hid_usage *usage, __s32 value)
@@ -384,6 +411,13 @@ void hidinput_event_quirks(struct hid_device *hid, struct hid_field *field, stru
                         input_event(input, usage->type, last_key, 0);
                 }
         }
+
+        /* handle the temporary quirky mapping to HWHEEL */
+        if (hid->quirks & HID_QUIRK_HWHEEL_WHEEL_INVERT &&
+                        usage->type == EV_REL && usage->code == REL_HWHEEL) {
+                input_event(input, usage->type, REL_WHEEL, -value);
+                return;
+        }
 }