Input: adbhid - capslock and power button fix

If the adbhid module parameter restore_capslock_events is used,
pressing the power button may confuse the capslock state. This is
because the power button release scancode (0xff) is sometimes the same
as the capslock press/release scancode.

This fix adds yet another flag to track the state of the power button
so that it works independently of capslock.

Signed-off-by: Rodney Lorrimar <rodney@rodney.id.au>
Signed-off-by: Dmitry Torokhov <dtor@mail.ru>

1 files changed, 12 insertions, 3 deletions

diff --git a/drivers/macintosh/adbhid.c b/drivers/macintosh/adbhid.c
index 6e9afe26db8..b7f41d3823a 100644
--- a/drivers/macintosh/adbhid.c
+++ b/drivers/macintosh/adbhid.c
@@ -225,6 +225,7 @@ struct adbhid {
 #define FLAG_CAPSLOCK_TRANSLATE         0x00000008
 #define FLAG_CAPSLOCK_DOWN              0x00000010
 #define FLAG_CAPSLOCK_IGNORE_NEXT       0x00000020
+#define FLAG_POWER_KEY_PRESSED          0x00000040
 
 static struct adbhid *adbhid[16];
 
@@ -301,9 +302,11 @@ adbhid_input_keycode(int id, int scancode, int repeat)
                                 ahid->flags |= FLAG_CAPSLOCK_TRANSLATE
                                         | FLAG_CAPSLOCK_DOWN;
                         }
-                } else if (scancode == 0xff) {
+                } else if (scancode == 0xff &&
+                           !(ahid->flags & FLAG_POWER_KEY_PRESSED)) {
                         /* Scancode 0xff usually signifies that the capslock
-                         * key was either pressed or released. */
+                         * key was either pressed or released, or that the
+                         * power button was released. */
                         if (ahid->flags & FLAG_CAPSLOCK_TRANSLATE) {
                                 keycode = ADB_KEY_CAPSLOCK;
                                 if (ahid->flags & FLAG_CAPSLOCK_DOWN) {
@@ -317,7 +320,7 @@ adbhid_input_keycode(int id, int scancode, int repeat)
                                 }
                         } else {
                                 printk(KERN_INFO "Spurious caps lock event "
-                                                "(scancode 0xff).");
+                                                 "(scancode 0xff).\n");
                         }
                 }
         }
@@ -344,6 +347,12 @@ adbhid_input_keycode(int id, int scancode, int repeat)
                 }
                 break;
         case ADB_KEY_POWER:
+                /* Keep track of the power key state */
+                if (up_flag)
+                        ahid->flags &= ~FLAG_POWER_KEY_PRESSED;
+                else
+                        ahid->flags |= FLAG_POWER_KEY_PRESSED;
+
                 /* Fn + Command will produce a bogus "power" keycode */
                 if (ahid->flags & FLAG_FN_KEY_PRESSED) {
                         keycode = ADB_KEY_CMD;