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HID: apple: Swap the Fn and Left Control keys on Apple keyboards

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This patch allows users to swap the Fn and left Control keys on all Apple
keyboards: internal (e.g. Macbooks) and external (both wired and wireless).
The patch adds a new hid-apple module param: swap_fn_leftctrl (off by default).

Signed-off-by: Zakhar Semenov <mail@free5lot.com>
Signed-off-by: Jiri Kosina <jkosina@suse.cz>
This commit is contained in:
free5lot 2020-05-15 13:14:00 +07:00 committed by Jiri Kosina
parent 47cf1b422e
commit 346338ef00
1 changed files with 28 additions and 2 deletions
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30
drivers/hid/hid-apple.c
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@ -51,6 +51,12 @@ MODULE_PARM_DESC(swap_opt_cmd, "Swap the Option (\"Alt\") and Command (\"Flag\")
"(For people who want to keep Windows PC keyboard muscle memory. "
"[0] = as-is, Mac layout. 1 = swapped, Windows layout.)");
static unsigned int swap_fn_leftctrl;
module_param(swap_fn_leftctrl, uint, 0644);
MODULE_PARM_DESC(swap_fn_leftctrl, "Swap the Fn and left Control keys. "
"(For people who want to keep PC keyboard muscle memory. "
"[0] = as-is, Mac layout, 1 = swapped, PC layout)");
struct apple_sc {
unsigned long quirks;
unsigned int fn_on;
@ -162,6 +168,11 @@ static const struct apple_key_translation swapped_option_cmd_keys[] = {
{ }
};
static const struct apple_key_translation swapped_fn_leftctrl_keys[] = {
{ KEY_FN, KEY_LEFTCTRL },
{ }
};
static const struct apple_key_translation *apple_find_translation(
const struct apple_key_translation *table, u16 from)
{
@ -183,9 +194,11 @@ static int hidinput_apple_event(struct hid_device *hid, struct input_dev *input,
bool do_translate;
u16 code = 0;
if (usage->code == KEY_FN) {
u16 fn_keycode = (swap_fn_leftctrl) ? (KEY_LEFTCTRL) : (KEY_FN);
if (usage->code == fn_keycode) {
asc->fn_on = !!value;
input_event(input, usage->type, usage->code, value);
input_event(input, usage->type, KEY_FN, value);
return 1;
}
@ -270,6 +283,14 @@ static int hidinput_apple_event(struct hid_device *hid, struct input_dev *input,
}
}
if (swap_fn_leftctrl) {
trans = apple_find_translation(swapped_fn_leftctrl_keys, usage->code);
if (trans) {
input_event(input, usage->type, trans->to, value);
return 1;
}
}
return 0;
}
@ -333,6 +354,11 @@ static void apple_setup_input(struct input_dev *input)
for (trans = apple_iso_keyboard; trans->from; trans++)
set_bit(trans->to, input->keybit);
if (swap_fn_leftctrl) {
for (trans = swapped_fn_leftctrl_keys; trans->from; trans++)
set_bit(trans->to, input->keybit);
}
}
static int apple_input_mapping(struct hid_device *hdev, struct hid_input *hi,