path: root/alps.patch

This patch implements an ALPS touchpad driver with the following
features:

* Dmitry Torokhov: The driver will try to auto-detect presence of an
  ALPS touchpad by issuing E6/E7 requests and matching responses with
  known ALPS signatures.

* Dmitry Torokhov: It will also try disabling hardware tapping so taps
  could be controlled by either userspace drivers (X/GPM) or future
  version of mousedev (2.6.8 I hope will have it).

* Alastair M. Robinson: Code to set absolute mode for DualPoint
  touchpads found on Dell CPx machines. (Ported to the 2.6 kernel
  driver by Peter Osterlund)

---

 linux-petero/drivers/input/mouse/Makefile       |    2 
 linux-petero/drivers/input/mouse/alps.c         |  422 ++++++++++++++++++++++++
 linux-petero/drivers/input/mouse/alps.h         |   17 
 linux-petero/drivers/input/mouse/psmouse-base.c |   24 +
 linux-petero/drivers/input/mouse/psmouse.h      |    4 
 5 files changed, 467 insertions(+), 2 deletions(-)

diff -puN drivers/input/mouse/Makefile~alps drivers/input/mouse/Makefile
--- linux/drivers/input/mouse/Makefile~alps	2004-07-31 11:24:04.000000000 +0200
+++ linux-petero/drivers/input/mouse/Makefile	2004-07-31 11:24:04.000000000 +0200
@@ -14,4 +14,4 @@ obj-$(CONFIG_MOUSE_PS2)		+= psmouse.o
 obj-$(CONFIG_MOUSE_SERIAL)	+= sermouse.o
 obj-$(CONFIG_MOUSE_VSXXXAA)	+= vsxxxaa.o
 
-psmouse-objs  := psmouse-base.o logips2pp.o synaptics.o
+psmouse-objs  := psmouse-base.o alps.o logips2pp.o synaptics.o
diff -puN /dev/null drivers/input/mouse/alps.c
--- /dev/null	2004-02-23 22:02:56.000000000 +0100
+++ linux-petero/drivers/input/mouse/alps.c	2004-07-31 15:55:30.082455504 +0200
@@ -0,0 +1,422 @@
+/*
+ * 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) 2004 Dmitry Torokhov <dtor@mail.ru>
+ *
+ * ALPS detection, tap switching and status querying info is taken from
+ * tpconfig utility (by C. Scott Ananian and Bruce Kall).
+ *
+ * This program is free software; you can redistribute it and/or modify it
+ * under the terms of the GNU General Public License version 2 as published by
+ * the Free Software Foundation.
+ */
+
+#include <linux/input.h>
+#include <linux/serio.h>
+
+#include "psmouse.h"
+#include "alps.h"
+
+#define DEBUG
+#ifdef DEBUG
+#define dbg(format, arg...) printk(KERN_INFO "alps.c: " format "\n", ## arg)
+#else
+#define dbg(format, arg...) do {} while (0)
+#endif
+
+#define ALPS_MODEL_GLIDEPOINT	1
+#define ALPS_MODEL_DUALPOINT	2
+
+struct alps_model_info {
+	unsigned char signature[3];
+	unsigned char model;
+} alps_model_data[] = {
+	{ { 0x33, 0x02, 0x0a },	ALPS_MODEL_GLIDEPOINT },
+	{ { 0x53, 0x02, 0x0a },	ALPS_MODEL_GLIDEPOINT },
+	{ { 0x53, 0x02, 0x14 },	ALPS_MODEL_GLIDEPOINT },
+	{ { 0x63, 0x02, 0x0a },	ALPS_MODEL_GLIDEPOINT },
+	{ { 0x63, 0x02, 0x14 },	ALPS_MODEL_GLIDEPOINT },
+	{ { 0x73, 0x02, 0x0a },	ALPS_MODEL_GLIDEPOINT },
+	{ { 0x73, 0x02, 0x14 },	ALPS_MODEL_GLIDEPOINT },
+	{ { 0x63, 0x02, 0x28 },	ALPS_MODEL_GLIDEPOINT },
+	{ { 0x63, 0x02, 0x3c },	ALPS_MODEL_GLIDEPOINT },
+	{ { 0x63, 0x02, 0x50 },	ALPS_MODEL_GLIDEPOINT },
+	{ { 0x63, 0x02, 0x64 },	ALPS_MODEL_GLIDEPOINT },
+	{ { 0x20, 0x02, 0x0e },	ALPS_MODEL_DUALPOINT },
+	{ { 0x22, 0x02, 0x0a },	ALPS_MODEL_DUALPOINT },
+	{ { 0x22, 0x02, 0x14 }, ALPS_MODEL_DUALPOINT },
+};
+
+/*
+ * ALPS abolute Mode
+ * byte 0:  1    1    1    1    1  mid0 rig0 lef0
+ * byte 1:  0   x6   x5   x4   x3   x2   x1   x0
+ * byte 2:  0   x10  x9   x8   x7  up1  fin  ges
+ * byte 3:  0   y9   y8   y7    1  mid1 rig1 lef1
+ * byte 4:  0   y6   y5   y4   y3   y2   y1   y0
+ * byte 5:  0   z6   z5   z4   z3   z2   z1   z0
+ *
+ * On a dualpoint, {mid,rig,lef}0 are the stick, 1 are the pad.
+ * We just 'or' them together for now.
+ *
+ * We used to send 'ges'tures as BTN_TOUCH but this made it impossible
+ * to disable tap events in the synaptics driver since the driver
+ * was unable to distinguish a gesture tap from an actual button click.
+ * A tap gesture now creates an emulated touch that the synaptics
+ * driver can interpret as a tap event, if MaxTapTime=0 and
+ * MaxTapMove=0 then the driver will ignore taps.
+ *
+ * The touchpad on an 'Acer Aspire' has 4 buttons:
+ *   left,right,up,down.
+ * This device always sets {mid,rig,lef}0 to 1 and
+ * reflects left,right,down,up in lef1,rig1,mid1,up1.
+ */
+
+static void alps_process_packet(struct psmouse *psmouse, struct pt_regs *regs)
+{
+	unsigned char *packet = psmouse->packet;
+	struct input_dev *dev = &psmouse->dev;
+	int x, y, z;
+	int left = 0, right = 0, middle = 0;
+
+	input_regs(dev, regs);
+
+	if ((packet[0] & 0xc8) == 0x08) {   /* 3-byte PS/2 packet */
+		x = packet[1];
+		if (packet[0] & 0x10)
+			x = x - 256;
+		y = packet[2];
+		if (packet[0] & 0x20)
+			y = y - 256;
+		left  = (packet[0]     ) & 1;
+		right = (packet[0] >> 1) & 1;
+
+		input_report_rel(dev, REL_X, x);
+		input_report_rel(dev, REL_Y, -y);
+		input_report_key(dev, BTN_A, left);
+		input_report_key(dev, BTN_B, right);
+		input_sync(dev);
+		return;
+	}
+
+	x = (packet[1] & 0x7f) | ((packet[2] & 0x78)<<(7-3));
+	y = (packet[4] & 0x7f) | ((packet[3] & 0x70)<<(7-4));
+	z = packet[5];
+
+	if (z == 127) {	/* DualPoint stick is relative, not absolute */
+		if (x > 383)
+			x = x - 768;
+		if (y > 255)
+			y = y - 512;
+		left  = packet[3] & 1;
+		right = (packet[3] >> 1) & 1;
+
+		input_report_rel(dev, REL_X, x);
+		input_report_rel(dev, REL_Y, -y);
+		input_report_key(dev, BTN_LEFT, left);
+		input_report_key(dev, BTN_RIGHT, right);
+		input_sync(dev);
+		return;
+	}
+
+	if (z > 30) input_report_key(dev, BTN_TOUCH, 1);
+	if (z < 25) input_report_key(dev, BTN_TOUCH, 0);
+
+	if (z > 0) {
+		input_report_abs(dev, ABS_X, x);
+		input_report_abs(dev, ABS_Y, y);
+	}
+	input_report_abs(dev, ABS_PRESSURE, z);
+	input_report_key(dev, BTN_TOOL_FINGER, z > 0);
+
+	left  |= (packet[2]     ) & 1;
+	left  |= (packet[3]     ) & 1;
+	right |= (packet[3] >> 1) & 1;
+	if (packet[0] == 0xff) {
+		int back    = (packet[3] >> 2) & 1;
+		int forward = (packet[2] >> 2) & 1;
+		if (back && forward) {
+			middle = 1;
+			back = 0;
+			forward = 0;
+		}
+		input_report_key(dev, BTN_BACK,    back);
+		input_report_key(dev, BTN_FORWARD, forward);
+	} else {
+		left   |= (packet[0]     ) & 1;
+		right  |= (packet[0] >> 1) & 1;
+		middle |= (packet[0] >> 2) & 1;
+		middle |= (packet[3] >> 2) & 1;
+	}
+
+	input_report_key(dev, BTN_LEFT, left);
+	input_report_key(dev, BTN_RIGHT, right);
+	input_report_key(dev, BTN_MIDDLE, middle);
+
+	input_sync(dev);
+}
+
+static psmouse_ret_t alps_process_byte(struct psmouse *psmouse, struct pt_regs *regs)
+{
+	if ((psmouse->packet[0] & 0xc8) == 0x08) { /* PS/2 packet */
+		if (psmouse->pktcnt == 3) {
+			alps_process_packet(psmouse, regs);
+			return PSMOUSE_FULL_PACKET;
+		}
+		return PSMOUSE_GOOD_DATA;
+	}
+
+	/* ALPS absolute mode packets start with 0b11111mrl */
+	if ((psmouse->packet[0] & 0xf8) != 0xf8)
+		return PSMOUSE_BAD_DATA;
+
+	/* Bytes 2 - 6 should have 0 in the highest bit */
+	if (psmouse->pktcnt > 1 && psmouse->pktcnt <= 6 &&
+	    (psmouse->packet[psmouse->pktcnt] & 0x80))
+		return PSMOUSE_BAD_DATA;
+
+	if (psmouse->pktcnt == 6) {
+		alps_process_packet(psmouse, regs);
+		return PSMOUSE_FULL_PACKET;
+	}
+
+	return PSMOUSE_GOOD_DATA;
+}
+
+int alps_get_model(struct psmouse *psmouse)
+{
+	unsigned char param[4];
+	int i;
+
+	/*
+	 * First try "E6 report".
+	 * ALPS should return 0x00,0x00,0x0a or 0x00,0x00,0x64
+	 */
+	param[0] = 0;
+	if (psmouse_command(psmouse, param, PSMOUSE_CMD_SETRES) ||
+	    psmouse_command(psmouse,  NULL, PSMOUSE_CMD_SETSCALE11) ||
+	    psmouse_command(psmouse,  NULL, PSMOUSE_CMD_SETSCALE11) ||
+	    psmouse_command(psmouse,  NULL, PSMOUSE_CMD_SETSCALE11))
+		return -1;
+
+	param[0] = param[1] = param[2] = 0xff;
+	if (psmouse_command(psmouse, param, PSMOUSE_CMD_GETINFO))
+		return -1;
+
+	dbg("E6 report: %2.2x %2.2x %2.2x", param[0], param[1], param[2]);
+
+	if (param[0] != 0x00 || param[1] != 0x00 || (param[2] != 0x0a && param[2] != 0x64))
+		return -1;
+
+	/* Now try "E7 report". ALPS should return 0x33 in byte 1 */
+	param[0] = 0;
+	if (psmouse_command(psmouse, param, PSMOUSE_CMD_SETRES) ||
+	    psmouse_command(psmouse,  NULL, PSMOUSE_CMD_SETSCALE21) ||
+	    psmouse_command(psmouse,  NULL, PSMOUSE_CMD_SETSCALE21) ||
+	    psmouse_command(psmouse,  NULL, PSMOUSE_CMD_SETSCALE21))
+		return -1;
+
+	param[0] = param[1] = param[2] = 0xff;
+	if (psmouse_command(psmouse, param, PSMOUSE_CMD_GETINFO))
+		return -1;
+
+	dbg("E7 report: %2.2x %2.2x %2.2x", param[0], param[1], param[2]);
+
+	for (i = 0; i < ARRAY_SIZE(alps_model_data); i++)
+		if (!memcmp(param, alps_model_data[i].signature, sizeof(alps_model_data[i].signature)))
+			return alps_model_data[i].model;
+
+	return -1;
+}
+
+/*
+ * For DualPoint devices select the device that should respond to
+ * subsequent commands. It looks like glidepad is behind stickpointer,
+ * I'd thought it would be other way around...
+ */
+static int alps_passthrough_mode(struct psmouse *psmouse, int enable)
+{
+	unsigned char param[3];
+	int cmd = enable ? PSMOUSE_CMD_SETSCALE21 : PSMOUSE_CMD_SETSCALE11;
+
+	if (psmouse_command(psmouse, NULL, cmd) ||
+	    psmouse_command(psmouse, NULL, cmd) ||
+	    psmouse_command(psmouse, NULL, cmd) ||
+	    psmouse_command(psmouse, NULL, PSMOUSE_CMD_DISABLE))
+		return -1;
+
+	/* we may get 3 more bytes, just ignore them */
+	psmouse_command(psmouse, param, 0x0300);
+
+	return 0;
+}
+
+static int alps_magic_knock(struct psmouse *psmouse)
+{
+	/* Try ALPS magic knock - 4 disable before enable */
+	if (psmouse_command(psmouse, NULL, PSMOUSE_CMD_DISABLE) ||
+	    psmouse_command(psmouse, NULL, PSMOUSE_CMD_DISABLE) ||
+	    psmouse_command(psmouse, NULL, PSMOUSE_CMD_DISABLE) ||
+	    psmouse_command(psmouse, NULL, PSMOUSE_CMD_DISABLE) ||
+	    psmouse_command(psmouse, NULL, PSMOUSE_CMD_ENABLE))
+		return -1;
+	return 0;
+}
+
+static int alps_absolute_mode(struct psmouse *psmouse)
+{
+	if (psmouse_command(psmouse, NULL, PSMOUSE_CMD_RESET_DIS))
+		return -1;
+
+	if (alps_passthrough_mode(psmouse, 1))
+		return -1;
+
+	if (alps_magic_knock(psmouse))
+		return -1;
+
+	if (alps_passthrough_mode(psmouse, 0))
+		return -1;
+
+	if (alps_magic_knock(psmouse))
+		return -1;
+
+	/*
+	 * Switch mouse to poll (remote) mode so motion data will not
+	 * get in our way
+	 */
+	return psmouse_command(psmouse, NULL, PSMOUSE_CMD_SETPOLL);
+}
+
+static int alps_get_status(struct psmouse *psmouse, char *param)
+{
+	/* Get status: 0xF5 0xF5 0xF5 0xE9 */
+	if (psmouse_command(psmouse, NULL, PSMOUSE_CMD_DISABLE) ||
+	    psmouse_command(psmouse, NULL, PSMOUSE_CMD_DISABLE) ||
+	    psmouse_command(psmouse, NULL, PSMOUSE_CMD_DISABLE) ||
+	    psmouse_command(psmouse, param, PSMOUSE_CMD_GETINFO))
+		return -1;
+
+	dbg("Status: %2.2x %2.2x %2.2x", param[0], param[1], param[2]);
+
+	return 0;
+}
+
+/*
+ * Turn touchpad tapping on or off. The sequences are:
+ * 0xE9 0xF5 0xF5 0xF3 0x0A to enable,
+ * 0xE9 0xF5 0xF5 0xE8 0x00 to disable.
+ * My guess that 0xE9 (GetInfo) is here as a sync point.
+ * For models that also have stickpointer (DualPoints) its tapping
+ * is controlled separately (0xE6 0xE6 0xE6 0xF3 0x14|0x0A) but
+ * we don't fiddle with it.
+ */
+static int alps_tap_mode(struct psmouse *psmouse, int model, int enable)
+{
+	int rc = 0;
+	int cmd = enable ? PSMOUSE_CMD_SETRATE : PSMOUSE_CMD_SETRES;
+	unsigned char tap_arg = enable ? 0x0A : 0x00;
+	unsigned char param[4];
+
+	if (model == ALPS_MODEL_DUALPOINT && alps_passthrough_mode(psmouse, 1))
+		return -1;
+
+	if (psmouse_command(psmouse, param, PSMOUSE_CMD_GETINFO) ||
+	    psmouse_command(psmouse, NULL, PSMOUSE_CMD_DISABLE) ||
+	    psmouse_command(psmouse, NULL, PSMOUSE_CMD_DISABLE) ||
+	    psmouse_command(psmouse, &tap_arg, cmd))
+		rc = -1;
+
+	if (model == ALPS_MODEL_DUALPOINT && alps_passthrough_mode(psmouse, 0))
+		return -1;
+
+	if (alps_get_status(psmouse, param))
+		return -1;
+
+
+	return rc;
+}
+
+static int alps_reconnect(struct psmouse *psmouse)
+{
+	int model;
+	unsigned char param[4];
+
+	if ((model = alps_get_model(psmouse)) < 0)
+		return -1;
+
+	if (alps_get_status(psmouse, param))
+		return -1;
+
+	if ((model == ALPS_MODEL_DUALPOINT ? param[2] : param[0]) & 0x04)
+		alps_tap_mode(psmouse, model, 0);
+
+	if (alps_absolute_mode(psmouse)) {
+		printk(KERN_ERR "alps.c: Failed to enable absolute mode\n");
+		return -1;
+	}
+
+	return 0;
+}
+
+static void alps_disconnect(struct psmouse *psmouse)
+{
+	psmouse_reset(psmouse);
+}
+
+int alps_init(struct psmouse *psmouse)
+{
+	unsigned char param[4];
+	int model;
+
+	if ((model = alps_get_model(psmouse)) < 0)
+		return -1;
+
+	if (alps_get_status(psmouse, param)) {
+		printk(KERN_ERR "alps.c: touchpad status report request failed\n");
+		return -1;
+	}
+
+	printk(KERN_INFO "ALPS Touchpad (%s) detected\n",
+		model == ALPS_MODEL_GLIDEPOINT ? "Glidepoint" : "Dualpoint");
+
+	if ((model == ALPS_MODEL_DUALPOINT ? param[2] : param[0]) & 0x04) {
+		printk(KERN_INFO "  Disabling hardware tapping\n");
+		if (alps_tap_mode(psmouse, model, 0))
+			printk(KERN_WARNING "alps.c: Failed to disable hardware tapping\n");
+	}
+
+	if (alps_absolute_mode(psmouse)) {
+		printk(KERN_ERR "alps.c: Failed to enable absolute mode\n");
+		return -1;
+	}
+
+	psmouse->dev.evbit[LONG(EV_REL)] |= BIT(EV_REL);
+	psmouse->dev.relbit[LONG(REL_X)] |= BIT(REL_X);
+	psmouse->dev.relbit[LONG(REL_Y)] |= BIT(REL_Y);
+	psmouse->dev.keybit[LONG(BTN_A)] |= BIT(BTN_A);
+	psmouse->dev.keybit[LONG(BTN_B)] |= BIT(BTN_B);
+
+	psmouse->dev.evbit[LONG(EV_ABS)] |= BIT(EV_ABS);
+	input_set_abs_params(&psmouse->dev, ABS_X, 0, 0, 0, 0);
+	input_set_abs_params(&psmouse->dev, ABS_Y, 0, 0, 0, 0);
+	input_set_abs_params(&psmouse->dev, ABS_PRESSURE, 0, 127, 0, 0);
+
+	psmouse->dev.keybit[LONG(BTN_TOUCH)] |= BIT(BTN_TOUCH);
+	psmouse->dev.keybit[LONG(BTN_TOOL_FINGER)] |= BIT(BTN_TOOL_FINGER);
+	psmouse->dev.keybit[LONG(BTN_FORWARD)] |= BIT(BTN_FORWARD);
+	psmouse->dev.keybit[LONG(BTN_BACK)] |= BIT(BTN_BACK);
+
+	psmouse->protocol_handler = alps_process_byte;
+	psmouse->disconnect = alps_disconnect;
+	psmouse->reconnect = alps_reconnect;
+
+	return 0;
+}
+
+int alps_detect(struct psmouse *psmouse)
+{
+	return alps_get_model(psmouse) < 0 ? 0 : 1;
+}
+
diff -puN /dev/null drivers/input/mouse/alps.h
--- /dev/null	2004-02-23 22:02:56.000000000 +0100
+++ linux-petero/drivers/input/mouse/alps.h	2004-07-31 11:24:04.000000000 +0200
@@ -0,0 +1,17 @@
+/*
+ * ALPS touchpad PS/2 mouse driver
+ *
+ * Copyright (c) 2003 Peter Osterlund <petero2@telia.com>
+ *
+ * This program is free software; you can redistribute it and/or modify it
+ * under the terms of the GNU General Public License version 2 as published by
+ * the Free Software Foundation.
+ */
+
+#ifndef _ALPS_H
+#define _ALPS_H
+
+int alps_detect(struct psmouse *psmouse);
+int alps_init(struct psmouse *psmouse);
+
+#endif
diff -puN drivers/input/mouse/psmouse-base.c~alps drivers/input/mouse/psmouse-base.c
--- linux/drivers/input/mouse/psmouse-base.c~alps	2004-07-31 11:24:04.000000000 +0200
+++ linux-petero/drivers/input/mouse/psmouse-base.c	2004-07-31 11:24:04.000000000 +0200
@@ -2,6 +2,7 @@
  * PS/2 mouse driver
  *
  * Copyright (c) 1999-2002 Vojtech Pavlik
+ * Copyright (c) 2003-2004 Dmitry Torokhov
  */
 
 /*
@@ -21,6 +22,7 @@
 #include "psmouse.h"
 #include "synaptics.h"
 #include "logips2pp.h"
+#include "alps.h"
 
 MODULE_AUTHOR("Vojtech Pavlik <vojtech@suse.cz>");
 MODULE_DESCRIPTION("PS/2 mouse driver");
@@ -53,7 +55,7 @@ __obsolete_setup("psmouse_smartscroll=")
 __obsolete_setup("psmouse_resetafter=");
 __obsolete_setup("psmouse_rate=");
 
-static char *psmouse_protocols[] = { "None", "PS/2", "PS2++", "PS2T++", "GenPS/2", "ImPS/2", "ImExPS/2", "SynPS/2"};
+static char *psmouse_protocols[] = { "None", "PS/2", "PS2++", "PS2T++", "GenPS/2", "ImPS/2", "ImExPS/2", "SynPS/2", "AlpsPS/2" };
 
 /*
  * psmouse_process_byte() analyzes the PS/2 data stream and reports
@@ -442,6 +444,26 @@ static int psmouse_extensions(struct psm
 		synaptics_reset(psmouse);
 	}
 
+/*
+ * Try ALPS TouchPad
+ */
+	if (max_proto > PSMOUSE_PS2 && alps_detect(psmouse)) {
+
+		if (set_properties) {
+			psmouse->vendor = "ALPS";
+			psmouse->name = "TouchPad";
+		}
+
+		if (max_proto > PSMOUSE_IMEX)
+			if (!set_properties || alps_init(psmouse) == 0)
+				return PSMOUSE_ALPS;
+
+/*
+ * Don't try anything fancy, just basic Intellimouse/Explorer protocols
+ */
+		max_proto = PSMOUSE_IMEX;
+	}
+
 	if (max_proto > PSMOUSE_IMEX && genius_detect(psmouse)) {
 
 		if (set_properties) {
diff -puN drivers/input/mouse/psmouse.h~alps drivers/input/mouse/psmouse.h
--- linux/drivers/input/mouse/psmouse.h~alps	2004-07-31 11:24:04.000000000 +0200
+++ linux-petero/drivers/input/mouse/psmouse.h	2004-07-31 11:24:04.000000000 +0200
@@ -2,13 +2,16 @@
 #define _PSMOUSE_H
 
 #define PSMOUSE_CMD_SETSCALE11	0x00e6
+#define PSMOUSE_CMD_SETSCALE21	0x00e7
 #define PSMOUSE_CMD_SETRES	0x10e8
 #define PSMOUSE_CMD_GETINFO	0x03e9
 #define PSMOUSE_CMD_SETSTREAM	0x00ea
+#define PSMOUSE_CMD_SETPOLL	0x00f0
 #define PSMOUSE_CMD_POLL	0x03eb
 #define PSMOUSE_CMD_GETID	0x02f2
 #define PSMOUSE_CMD_SETRATE	0x10f3
 #define PSMOUSE_CMD_ENABLE	0x00f4
+#define PSMOUSE_CMD_DISABLE	0x00f5
 #define PSMOUSE_CMD_RESET_DIS	0x00f6
 #define PSMOUSE_CMD_RESET_BAT	0x02ff
 
@@ -72,6 +75,7 @@ struct psmouse {
 #define PSMOUSE_IMPS		5
 #define PSMOUSE_IMEX		6
 #define PSMOUSE_SYNAPTICS 	7
+#define PSMOUSE_ALPS		8
 
 int psmouse_command(struct psmouse *psmouse, unsigned char *param, int command);
 int psmouse_sliced_command(struct psmouse *psmouse, unsigned char command);
_