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SubjectRe: [PATCH v2] HID: apple: Fix stuck function keys when using FN
Hi Benjamin,

On Tue, 3 Sep 2019 at 16:46, Benjamin Tissoires
<benjamin.tissoires@redhat.com> wrote:
>
> From: Joao Moreno <mail@joaomoreno.com>
>
> This fixes an issue in which key down events for function keys would be
> repeatedly emitted even after the user has raised the physical key. For
> example, the driver fails to emit the F5 key up event when going through
> the following steps:
> - fnmode=1: hold FN, hold F5, release FN, release F5
> - fnmode=2: hold F5, hold FN, release F5, release FN
>
> The repeated F5 key down events can be easily verified using xev.
>
> Signed-off-by: Joao Moreno <mail@joaomoreno.com>
> Co-developed-by: Benjamin Tissoires <benjamin.tissoires@redhat.com>
> Signed-off-by: Benjamin Tissoires <benjamin.tissoires@redhat.com>
> ---
>
> Hi Joao,
>
> last chance to pull back :)
>
> If you are still happy, I'll push this version
>
> Cheers,
> Benjamin
>

Looks great. Thanks a bunch for your help!

Cheers,
João

> drivers/hid/hid-apple.c | 49 +++++++++++++++++++++++------------------
> 1 file changed, 28 insertions(+), 21 deletions(-)
>
> diff --git a/drivers/hid/hid-apple.c b/drivers/hid/hid-apple.c
> index 81df62f48c4c..6ac8becc2372 100644
> --- a/drivers/hid/hid-apple.c
> +++ b/drivers/hid/hid-apple.c
> @@ -54,7 +54,6 @@ MODULE_PARM_DESC(swap_opt_cmd, "Swap the Option (\"Alt\") and Command (\"Flag\")
> struct apple_sc {
> unsigned long quirks;
> unsigned int fn_on;
> - DECLARE_BITMAP(pressed_fn, KEY_CNT);
> DECLARE_BITMAP(pressed_numlock, KEY_CNT);
> };
>
> @@ -181,6 +180,8 @@ static int hidinput_apple_event(struct hid_device *hid, struct input_dev *input,
> {
> struct apple_sc *asc = hid_get_drvdata(hid);
> const struct apple_key_translation *trans, *table;
> + bool do_translate;
> + u16 code = 0;
>
> if (usage->code == KEY_FN) {
> asc->fn_on = !!value;
> @@ -189,8 +190,6 @@ static int hidinput_apple_event(struct hid_device *hid, struct input_dev *input,
> }
>
> if (fnmode) {
> - int do_translate;
> -
> if (hid->product >= USB_DEVICE_ID_APPLE_WELLSPRING4_ANSI &&
> hid->product <= USB_DEVICE_ID_APPLE_WELLSPRING4A_JIS)
> table = macbookair_fn_keys;
> @@ -202,25 +201,33 @@ static int hidinput_apple_event(struct hid_device *hid, struct input_dev *input,
> trans = apple_find_translation (table, usage->code);
>
> if (trans) {
> - if (test_bit(usage->code, asc->pressed_fn))
> - do_translate = 1;
> - else if (trans->flags & APPLE_FLAG_FKEY)
> - do_translate = (fnmode == 2 && asc->fn_on) ||
> - (fnmode == 1 && !asc->fn_on);
> - else
> - do_translate = asc->fn_on;
> -
> - if (do_translate) {
> - if (value)
> - set_bit(usage->code, asc->pressed_fn);
> - else
> - clear_bit(usage->code, asc->pressed_fn);
> -
> - input_event(input, usage->type, trans->to,
> - value);
> -
> - return 1;
> + if (test_bit(trans->from, input->key))
> + code = trans->from;
> + else if (test_bit(trans->to, input->key))
> + code = trans->to;
> +
> + if (!code) {
> + if (trans->flags & APPLE_FLAG_FKEY) {
> + switch (fnmode) {
> + case 1:
> + do_translate = !asc->fn_on;
> + break;
> + case 2:
> + do_translate = asc->fn_on;
> + break;
> + default:
> + /* should never happen */
> + do_translate = false;
> + }
> + } else {
> + do_translate = asc->fn_on;
> + }
> +
> + code = do_translate ? trans->to : trans->from;
> }
> +
> + input_event(input, usage->type, code, value);
> + return 1;
> }
>
> if (asc->quirks & APPLE_NUMLOCK_EMULATION &&
> --
> 2.19.2
>

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