Re: [PATCH] ALPS: fix enabling hardware tapping

[Peter Osterlund <petero2@telia.com>]

Dmitry Torokhov <dtor_core@ameritech.net> writes:

> It looks like logic for enabling hardware tapping in ALPS driver was
> inverted and we enable it only if it was already enabled by BIOS or
> firmware.

It looks like alps_init() has the same bug.  This patch fixes that
function too by moving the check if the tapping mode needs to change
into the alps_tap_mode() function, so that the test doesn't have to be
duplicated.

Signed-off-by: Peter Osterlund <petero2@telia.com>
---

 linux-petero/drivers/input/mouse/alps.c |   29 +++++++++++------------------
 1 files changed, 11 insertions(+), 18 deletions(-)

diff -puN drivers/input/mouse/alps.c~alps-hwtaps-fix drivers/input/mouse/alps.c
--- linux/drivers/input/mouse/alps.c~alps-hwtaps-fix	2005-07-03 13:42:47.000000000 +0200
+++ linux-petero/drivers/input/mouse/alps.c	2005-07-03 13:42:47.000000000 +0200
@@ -2,7 +2,7 @@
  * ALPS touchpad PS/2 mouse driver
  *
  * Copyright (c) 2003 Neil Brown <neilb@cse.unsw.edu.au>
- * Copyright (c) 2003 Peter Osterlund <petero2@telia.com>
+ * Copyright (c) 2003-2005 Peter Osterlund <petero2@telia.com>
  * Copyright (c) 2004 Dmitry Torokhov <dtor@mail.ru>
  * Copyright (c) 2005 Vojtech Pavlik <vojtech@suse.cz>
  *
@@ -334,6 +334,13 @@ static int alps_tap_mode(struct psmouse 
 	int cmd = enable ? PSMOUSE_CMD_SETRATE : PSMOUSE_CMD_SETRES;
 	unsigned char tap_arg = enable ? 0x0A : 0x00;
 	unsigned char param[4];
+	int enabled;
+
+	if (alps_get_status(psmouse, param))
+		return -1;
+	enabled = (param[0] & 0x04) != 0;
+	if (enabled == enable)
+		return 0;
 
 	if (ps2_command(ps2dev, param, PSMOUSE_CMD_GETINFO) ||
 	    ps2_command(ps2dev, NULL, PSMOUSE_CMD_DISABLE) ||
@@ -350,7 +357,6 @@ static int alps_tap_mode(struct psmouse 
 static int alps_reconnect(struct psmouse *psmouse)
 {
 	struct alps_data *priv = psmouse->private;
-	unsigned char param[4];
 	int version;
 
 	psmouse_reset(psmouse);
@@ -361,11 +367,7 @@ static int alps_reconnect(struct psmouse
 	if (priv->i->flags & ALPS_PASS && alps_passthrough_mode(psmouse, 1))
 		return -1;
 
-	if (alps_get_status(psmouse, param))
-		return -1;
-
-	if (!(param[0] & 0x04))
-		alps_tap_mode(psmouse, 1);
+	alps_tap_mode(psmouse, 1);
 
 	if (alps_absolute_mode(psmouse)) {
 		printk(KERN_ERR "alps.c: Failed to enable absolute mode\n");
@@ -389,7 +391,6 @@ static void alps_disconnect(struct psmou
 int alps_init(struct psmouse *psmouse)
 {
 	struct alps_data *priv;
-	unsigned char param[4];
 	int version;
 
 	psmouse->private = priv = kmalloc(sizeof(struct alps_data), GFP_KERNEL);
@@ -403,16 +404,8 @@ int alps_init(struct psmouse *psmouse)
 	if ((priv->i->flags & ALPS_PASS) && alps_passthrough_mode(psmouse, 1))
 		goto init_fail;
 
-	if (alps_get_status(psmouse, param)) {
-		printk(KERN_ERR "alps.c: touchpad status report request failed\n");
-		goto init_fail;
-	}
-
-	if (param[0] & 0x04) {
-		printk(KERN_INFO "alps.c: Enabling hardware tapping\n");
-		if (alps_tap_mode(psmouse, 1))
-			printk(KERN_WARNING "alps.c: Failed to enable hardware tapping\n");
-	}
+	if (alps_tap_mode(psmouse, 1))
+		printk(KERN_WARNING "alps.c: Failed to enable hardware tapping\n");
 
 	if (alps_absolute_mode(psmouse)) {
 		printk(KERN_ERR "alps.c: Failed to enable absolute mode\n");
_

-- 
Peter Osterlund - petero2@telia.com
http://web.telia.com/~u89404340