path: root/drivers/hid/hid-apple.c
diff options
authorHans de Goede <hdegoede@redhat.com>2020-06-20 14:32:29 +0200
committerJiri Kosina <jkosina@suse.cz>2020-06-24 09:49:04 +0200
commita5d81646fa294eed57786a9310b06ca48902adf8 (patch)
tree1e41810b75896563462527fe82ed6351c2fb7484 /drivers/hid/hid-apple.c
parentMAINTAINERS: update uhid and hid-wiimote entry (diff)
HID: apple: Disable Fn-key key-re-mapping on clone keyboards
The Maxxter KB-BT-001 Bluetooth keyboard, which looks somewhat like the Apple Wireless Keyboard, is using the vendor and product IDs (05AC:0239) of the Apple Wireless Keyboard (2009 ANSI version) <sigh>. But its F1 - F10 keys are marked as sending F1 - F10, not the special functions hid-apple.c maps them too; and since its descriptors do not contain the HID_UP_CUSTOM | 0x0003 usage apple-hid looks for for the Fn-key, apple_setup_input() never gets called, so F1 - F6 are mapped to key-codes which have not been set in the keybit array causing them to not send any events at all. The lack of a usage code matching the Fn key in the clone is actually useful as this allows solving this problem in a generic way. This commits adds a fn_found flag and it adds a input_configured callback which checks if this flag is set once all usages have been mapped. If it is not set, then assume this is a clone and clear the quirks bitmap so that the hid-apple code does not add any special handling to this keyboard. This fixes F1 - F6 not sending anything at all and F7 - F12 sending the wrong codes on the Maxxter KB-BT-001 Bluetooth keyboard and on similar clones. Cc: Joao Moreno <mail@joaomoreno.com> Signed-off-by: Hans de Goede <hdegoede@redhat.com> Signed-off-by: Jiri Kosina <jkosina@suse.cz>
Diffstat (limited to 'drivers/hid/hid-apple.c')
1 files changed, 18 insertions, 0 deletions
diff --git a/drivers/hid/hid-apple.c b/drivers/hid/hid-apple.c
index 359bdfbe3701..e82f604d33e9 100644
--- a/drivers/hid/hid-apple.c
+++ b/drivers/hid/hid-apple.c
@@ -60,6 +60,7 @@ MODULE_PARM_DESC(swap_fn_leftctrl, "Swap the Fn and left Control keys. "
struct apple_sc {
unsigned long quirks;
unsigned int fn_on;
+ unsigned int fn_found;
DECLARE_BITMAP(pressed_numlock, KEY_CNT);
@@ -365,12 +366,15 @@ static int apple_input_mapping(struct hid_device *hdev, struct hid_input *hi,
struct hid_field *field, struct hid_usage *usage,
unsigned long **bit, int *max)
+ struct apple_sc *asc = hid_get_drvdata(hdev);
if (usage->hid == (HID_UP_CUSTOM | 0x0003) ||
usage->hid == (HID_UP_MSVENDOR | 0x0003) ||
usage->hid == (HID_UP_HPVENDOR2 | 0x0003)) {
/* The fn key on Apple USB keyboards */
set_bit(EV_REP, hi->input->evbit);
hid_map_usage_clear(hi, usage, bit, max, EV_KEY, KEY_FN);
+ asc->fn_found = true;
return 1;
@@ -397,6 +401,19 @@ static int apple_input_mapped(struct hid_device *hdev, struct hid_input *hi,
return 0;
+static int apple_input_configured(struct hid_device *hdev,
+ struct hid_input *hidinput)
+ struct apple_sc *asc = hid_get_drvdata(hdev);
+ if ((asc->quirks & APPLE_HAS_FN) && !asc->fn_found) {
+ hid_info(hdev, "Fn key not found (Apple Wireless Keyboard clone?), disabling Fn key handling\n");
+ asc->quirks = 0;
+ }
+ return 0;
static int apple_probe(struct hid_device *hdev,
const struct hid_device_id *id)
@@ -611,6 +628,7 @@ static struct hid_driver apple_driver = {
.event = apple_event,
.input_mapping = apple_input_mapping,
.input_mapped = apple_input_mapped,
+ .input_configured = apple_input_configured,