From: Peter Osterlund Only parse a "z == 127" packet as a relative Dualpoint stick packet if the touchpad actually is a Dualpoint device. The Glidepoint models don't have a stick, and can report z == 127 for a very wide finger. If such a packet is parsed as a stick packet, the mouse pointer will typically jump to one corner of the screen. Signed-off-by: Peter Osterlund Signed-off-by: Andrew Morton --- 25-akpm/drivers/input/mouse/alps.c | 20 ++++++++++---------- 25-akpm/drivers/input/mouse/alps.h | 1 + 2 files changed, 11 insertions(+), 10 deletions(-) diff -puN drivers/input/mouse/alps.c~input-fix-pointer-jumps-to-corner-of-screen-problem-on-alps-glidepoint-touchpads drivers/input/mouse/alps.c --- 25/drivers/input/mouse/alps.c~input-fix-pointer-jumps-to-corner-of-screen-problem-on-alps-glidepoint-touchpads 2005-02-02 15:08:13.832511312 -0800 +++ 25-akpm/drivers/input/mouse/alps.c 2005-02-02 15:08:13.838510400 -0800 @@ -109,7 +109,8 @@ static void alps_process_packet(struct p y = (packet[4] & 0x7f) | ((packet[3] & 0x70)<<(7-4)); z = packet[5]; - if (z == 127) { /* DualPoint stick is relative, not absolute */ + if ((priv->model == ALPS_MODEL_DUALPOINT) && (z == 127)) { + /* DualPoint stick, relative packet */ if (x > 383) x = x - 768; if (y > 255) @@ -344,13 +345,13 @@ static int alps_tap_mode(struct psmouse static int alps_reconnect(struct psmouse *psmouse) { - int model; + struct alps_data *priv = psmouse->private; unsigned char param[4]; - if ((model = alps_get_model(psmouse)) < 0) + if ((priv->model = alps_get_model(psmouse)) < 0) return -1; - if (model == ALPS_MODEL_DUALPOINT && alps_passthrough_mode(psmouse, 1)) + if (priv->model == ALPS_MODEL_DUALPOINT && alps_passthrough_mode(psmouse, 1)) return -1; if (alps_get_status(psmouse, param)) @@ -364,7 +365,7 @@ static int alps_reconnect(struct psmouse return -1; } - if (model == ALPS_MODEL_DUALPOINT && alps_passthrough_mode(psmouse, 0)) + if (priv->model == ALPS_MODEL_DUALPOINT && alps_passthrough_mode(psmouse, 0)) return -1; return 0; @@ -380,20 +381,19 @@ int alps_init(struct psmouse *psmouse) { struct alps_data *priv; unsigned char param[4]; - int model; psmouse->private = priv = kmalloc(sizeof(struct alps_data), GFP_KERNEL); if (!priv) goto init_fail; memset(priv, 0, sizeof(struct alps_data)); - if ((model = alps_get_model(psmouse)) < 0) + if ((priv->model = alps_get_model(psmouse)) < 0) goto init_fail; printk(KERN_INFO "ALPS Touchpad (%s) detected\n", - model == ALPS_MODEL_GLIDEPOINT ? "Glidepoint" : "Dualpoint"); + priv->model == ALPS_MODEL_GLIDEPOINT ? "Glidepoint" : "Dualpoint"); - if (model == ALPS_MODEL_DUALPOINT && alps_passthrough_mode(psmouse, 1)) + if (priv->model == ALPS_MODEL_DUALPOINT && alps_passthrough_mode(psmouse, 1)) goto init_fail; if (alps_get_status(psmouse, param)) { @@ -412,7 +412,7 @@ int alps_init(struct psmouse *psmouse) goto init_fail; } - if (model == ALPS_MODEL_DUALPOINT && alps_passthrough_mode(psmouse, 0)) + if (priv->model == ALPS_MODEL_DUALPOINT && alps_passthrough_mode(psmouse, 0)) goto init_fail; psmouse->dev.evbit[LONG(EV_REL)] |= BIT(EV_REL); diff -puN drivers/input/mouse/alps.h~input-fix-pointer-jumps-to-corner-of-screen-problem-on-alps-glidepoint-touchpads drivers/input/mouse/alps.h --- 25/drivers/input/mouse/alps.h~input-fix-pointer-jumps-to-corner-of-screen-problem-on-alps-glidepoint-touchpads 2005-02-02 15:08:13.834511008 -0800 +++ 25-akpm/drivers/input/mouse/alps.h 2005-02-02 15:08:13.838510400 -0800 @@ -15,6 +15,7 @@ int alps_detect(struct psmouse *psmouse, int alps_init(struct psmouse *psmouse); struct alps_data { + int model; /* Glidepoint or Dualpoint */ int prev_fin; /* Finger bit from previous packet */ }; _