[PATCH 3.10 163/173] HID: apple: option to swap the Option ("Alt") and Command ("Flag") keys.

Greg Kroah-Hartman
2013-12-02T19:12:26Z

From: Nanno Langstraat <langstr@gmail.com>

commit 43c831468b3d26dbe8f2e061ccaf1abaf9cc1b8b upstream.

Use case: people who use both Apple and PC keyboards regularly, and desire to
keep&use their PC muscle memory.

A particular use case: an Apple compact external keyboard connected to a PC
laptop. (This use case can't be covered well by X.org key remappings etc.)

Signed-off-by: Nanno Langstraat <langstr@gmail.com>
Signed-off-by: Jiri Kosina <jkosina@suse.cz>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>

---
drivers/hid/hid-apple.c | 22 ++++++++++++++++++++++
1 file changed, 22 insertions(+)

--- a/drivers/hid/hid-apple.c
+++ b/drivers/hid/hid-apple.c
@@ -46,6 +46,12 @@ module_param(iso_layout, uint, 0644);
MODULE_PARM_DESC(iso_layout, "Enable/Disable hardcoded ISO-layout of the keyboard. "
"(0 = disabled, [1] = enabled)");

+static unsigned int swap_opt_cmd = 0;
+module_param(swap_opt_cmd, uint, 0644);
+MODULE_PARM_DESC(swap_opt_cmd, "Swap the Option (\"Alt\") and Command (\"Flag\") keys. "
+ "(For people who want to keep Windows PC keyboard muscle memory. "
+ "[0] = as-is, Mac layout. 1 = swapped, Windows layout.)");
+
struct apple_sc {
unsigned long quirks;
unsigned int fn_on;
@@ -150,6 +156,14 @@ static const struct apple_key_translatio
{ }
};

+static const struct apple_key_translation swapped_option_cmd_keys[] = {
+ { KEY_LEFTALT, KEY_LEFTMETA },
+ { KEY_LEFTMETA, KEY_LEFTALT },
+ { KEY_RIGHTALT, KEY_RIGHTMETA },
+ { KEY_RIGHTMETA,KEY_RIGHTALT },
+ { }
+};
+
static const struct apple_key_translation *apple_find_translation(
const struct apple_key_translation *table, u16 from)
{
@@ -242,6 +256,14 @@ static int hidinput_apple_event(struct h
}
}

+ if (swap_opt_cmd) {
+ trans = apple_find_translation(swapped_option_cmd_keys, usage->code);
+ if (trans) {
+ input_event(input, usage->type, trans->to, value);
+ return 1;
+ }
+ }
+
return 0;
}