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path: root/drivers/hid/hid-input.c
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Diffstat (limited to 'drivers/hid/hid-input.c')
-rw-r--r--drivers/hid/hid-input.c26
1 files changed, 23 insertions, 3 deletions
diff --git a/drivers/hid/hid-input.c b/drivers/hid/hid-input.c
index 9505605b6e22..052869d0ab78 100644
--- a/drivers/hid/hid-input.c
+++ b/drivers/hid/hid-input.c
@@ -306,10 +306,13 @@ static enum power_supply_property hidinput_battery_props[] = {
static const struct hid_device_id hid_battery_quirks[] = {
{ HID_BLUETOOTH_DEVICE(USB_VENDOR_ID_APPLE,
- USB_DEVICE_ID_APPLE_ALU_WIRELESS_2009_ISO),
- HID_BATTERY_QUIRK_PERCENT | HID_BATTERY_QUIRK_FEATURE },
+ USB_DEVICE_ID_APPLE_ALU_WIRELESS_2009_ISO),
+ HID_BATTERY_QUIRK_PERCENT | HID_BATTERY_QUIRK_FEATURE },
+ { HID_BLUETOOTH_DEVICE(USB_VENDOR_ID_APPLE,
+ USB_DEVICE_ID_APPLE_ALU_WIRELESS_2009_ANSI),
+ HID_BATTERY_QUIRK_PERCENT | HID_BATTERY_QUIRK_FEATURE },
{ HID_BLUETOOTH_DEVICE(USB_VENDOR_ID_APPLE,
- USB_DEVICE_ID_APPLE_ALU_WIRELESS_2011_ANSI),
+ USB_DEVICE_ID_APPLE_ALU_WIRELESS_2011_ANSI),
HID_BATTERY_QUIRK_PERCENT | HID_BATTERY_QUIRK_FEATURE },
{ HID_BLUETOOTH_DEVICE(USB_VENDOR_ID_APPLE,
USB_DEVICE_ID_APPLE_ALU_WIRELESS_2011_ISO),
@@ -1104,6 +1107,23 @@ void hidinput_hid_event(struct hid_device *hid, struct hid_field *field, struct
return;
}
+ /*
+ * Ignore reports for absolute data if the data didn't change. This is
+ * not only an optimization but also fixes 'dead' key reports. Some
+ * RollOver implementations for localized keys (like BACKSLASH/PIPE; HID
+ * 0x31 and 0x32) report multiple keys, even though a localized keyboard
+ * can only have one of them physically available. The 'dead' keys
+ * report constant 0. As all map to the same keycode, they'd confuse
+ * the input layer. If we filter the 'dead' keys on the HID level, we
+ * skip the keycode translation and only forward real events.
+ */
+ if (!(field->flags & (HID_MAIN_ITEM_RELATIVE |
+ HID_MAIN_ITEM_BUFFERED_BYTE)) &&
+ (field->flags & HID_MAIN_ITEM_VARIABLE) &&
+ usage->usage_index < field->maxusage &&
+ value == field->value[usage->usage_index])
+ return;
+
/* report the usage code as scancode if the key status has changed */
if (usage->type == EV_KEY && !!test_bit(usage->code, input->key) != value)
input_event(input, EV_MSC, MSC_SCAN, usage->hid);