linux-kernel - [PATCH] Input: adbhid - capslock and power button fix

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Message-ID: <20080410101923.GB2945@solaria.local>
Date:	Thu, 10 Apr 2008 12:19:23 +0200
From:	Rodney Lorrimar <rodney@...ney.id.au>
To:	Pavel Machek <pavel@...e.cz>
Cc:	jikos@...e.cz, linux-kernel@...r.kernel.org,
	Benjamin Herrenschmidt <benh@...nel.crashing.org>,
	Andrew McNabb <amcnabb@...abbs.org>
Subject: [PATCH] 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@...ney.id.au>
---

This patch applies on top of the previous patch in the thread.

---
 drivers/macintosh/adbhid.c |   15 ++++++++++++---
 1 files changed, 12 insertions(+), 3 deletions(-)

diff --git a/drivers/macintosh/adbhid.c b/drivers/macintosh/adbhid.c
index 19d0984..72b9011 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;
-- 
1.5.4.5


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