Initial file dump from open source releaseHEADmaster

1 files changed, 1853 insertions, 0 deletions

diff --git a/drivers/input/mouse/alps.c b/drivers/input/mouse/alps.c
new file mode 100644
index 00000000..19e070f1
--- /dev/null
+++ b/drivers/input/mouse/alps.c
@@ -0,0 +1,1853 @@
+/*
+ * ALPS touchpad PS/2 mouse driver
+ *
+ * Copyright (c) 2003 Neil Brown <neilb@cse.unsw.edu.au>
+ * 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>
+ * Copyright (c) 2009 Sebastian Kapfer <sebastian_kapfer@gmx.net>
+ *
+ * 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/slab.h>
+#include <linux/input.h>
+#include <linux/input/mt.h>
+#include <linux/serio.h>
+#include <linux/libps2.h>
+
+#include "psmouse.h"
+#include "alps.h"
+
+/*
+ * Definitions for ALPS version 3 and 4 command mode protocol
+ */
+#define ALPS_CMD_NIBBLE_10	0x01f2
+
+#define ALPS_REG_BASE_RUSHMORE	0xc2c0
+#define ALPS_REG_BASE_PINNACLE	0x0000
+
+static const struct alps_nibble_commands alps_v3_nibble_commands[] = {
+	{ PSMOUSE_CMD_SETPOLL,		0x00 }, /* 0 */
+	{ PSMOUSE_CMD_RESET_DIS,	0x00 }, /* 1 */
+	{ PSMOUSE_CMD_SETSCALE21,	0x00 }, /* 2 */
+	{ PSMOUSE_CMD_SETRATE,		0x0a }, /* 3 */
+	{ PSMOUSE_CMD_SETRATE,		0x14 }, /* 4 */
+	{ PSMOUSE_CMD_SETRATE,		0x28 }, /* 5 */
+	{ PSMOUSE_CMD_SETRATE,		0x3c }, /* 6 */
+	{ PSMOUSE_CMD_SETRATE,		0x50 }, /* 7 */
+	{ PSMOUSE_CMD_SETRATE,		0x64 }, /* 8 */
+	{ PSMOUSE_CMD_SETRATE,		0xc8 }, /* 9 */
+	{ ALPS_CMD_NIBBLE_10,		0x00 }, /* a */
+	{ PSMOUSE_CMD_SETRES,		0x00 }, /* b */
+	{ PSMOUSE_CMD_SETRES,		0x01 }, /* c */
+	{ PSMOUSE_CMD_SETRES,		0x02 }, /* d */
+	{ PSMOUSE_CMD_SETRES,		0x03 }, /* e */
+	{ PSMOUSE_CMD_SETSCALE11,	0x00 }, /* f */
+};
+
+static const struct alps_nibble_commands alps_v4_nibble_commands[] = {
+	{ PSMOUSE_CMD_ENABLE,		0x00 }, /* 0 */
+	{ PSMOUSE_CMD_RESET_DIS,	0x00 }, /* 1 */
+	{ PSMOUSE_CMD_SETSCALE21,	0x00 }, /* 2 */
+	{ PSMOUSE_CMD_SETRATE,		0x0a }, /* 3 */
+	{ PSMOUSE_CMD_SETRATE,		0x14 }, /* 4 */
+	{ PSMOUSE_CMD_SETRATE,		0x28 }, /* 5 */
+	{ PSMOUSE_CMD_SETRATE,		0x3c }, /* 6 */
+	{ PSMOUSE_CMD_SETRATE,		0x50 }, /* 7 */
+	{ PSMOUSE_CMD_SETRATE,		0x64 }, /* 8 */
+	{ PSMOUSE_CMD_SETRATE,		0xc8 }, /* 9 */
+	{ ALPS_CMD_NIBBLE_10,		0x00 }, /* a */
+	{ PSMOUSE_CMD_SETRES,		0x00 }, /* b */
+	{ PSMOUSE_CMD_SETRES,		0x01 }, /* c */
+	{ PSMOUSE_CMD_SETRES,		0x02 }, /* d */
+	{ PSMOUSE_CMD_SETRES,		0x03 }, /* e */
+	{ PSMOUSE_CMD_SETSCALE11,	0x00 }, /* f */
+};
+
+
+#define ALPS_DUALPOINT		0x02	/* touchpad has trackstick */
+#define ALPS_PASS		0x04	/* device has a pass-through port */
+
+#define ALPS_WHEEL		0x08	/* hardware wheel present */
+#define ALPS_FW_BK_1		0x10	/* front & back buttons present */
+#define ALPS_FW_BK_2		0x20	/* front & back buttons present */
+#define ALPS_FOUR_BUTTONS	0x40	/* 4 direction button present */
+#define ALPS_PS2_INTERLEAVED	0x80	/* 3-byte PS/2 packet interleaved with
+					   6-byte ALPS packet */
+
+static const struct alps_model_info alps_model_data[] = {
+	{ { 0x32, 0x02, 0x14 },	0x00, ALPS_PROTO_V2, 0xf8, 0xf8, ALPS_PASS | ALPS_DUALPOINT },	/* Toshiba Salellite Pro M10 */
+	{ { 0x33, 0x02, 0x0a },	0x00, ALPS_PROTO_V1, 0x88, 0xf8, 0 },				/* UMAX-530T */
+	{ { 0x53, 0x02, 0x0a },	0x00, ALPS_PROTO_V2, 0xf8, 0xf8, 0 },
+	{ { 0x53, 0x02, 0x14 },	0x00, ALPS_PROTO_V2, 0xf8, 0xf8, 0 },
+	{ { 0x60, 0x03, 0xc8 }, 0x00, ALPS_PROTO_V2, 0xf8, 0xf8, 0 },				/* HP ze1115 */
+	{ { 0x63, 0x02, 0x0a },	0x00, ALPS_PROTO_V2, 0xf8, 0xf8, 0 },
+	{ { 0x63, 0x02, 0x14 },	0x00, ALPS_PROTO_V2, 0xf8, 0xf8, 0 },
+	{ { 0x63, 0x02, 0x28 },	0x00, ALPS_PROTO_V2, 0xf8, 0xf8, ALPS_FW_BK_2 },		/* Fujitsu Siemens S6010 */
+	{ { 0x63, 0x02, 0x3c },	0x00, ALPS_PROTO_V2, 0x8f, 0x8f, ALPS_WHEEL },			/* Toshiba Satellite S2400-103 */
+	{ { 0x63, 0x02, 0x50 },	0x00, ALPS_PROTO_V2, 0xef, 0xef, ALPS_FW_BK_1 },		/* NEC Versa L320 */
+	{ { 0x63, 0x02, 0x64 },	0x00, ALPS_PROTO_V2, 0xf8, 0xf8, 0 },
+	{ { 0x63, 0x03, 0xc8 }, 0x00, ALPS_PROTO_V2, 0xf8, 0xf8, ALPS_PASS | ALPS_DUALPOINT },	/* Dell Latitude D800 */
+	{ { 0x73, 0x00, 0x0a },	0x00, ALPS_PROTO_V2, 0xf8, 0xf8, ALPS_DUALPOINT },		/* ThinkPad R61 8918-5QG */
+	{ { 0x73, 0x02, 0x0a },	0x00, ALPS_PROTO_V2, 0xf8, 0xf8, 0 },
+	{ { 0x73, 0x02, 0x14 },	0x00, ALPS_PROTO_V2, 0xf8, 0xf8, ALPS_FW_BK_2 },		/* Ahtec Laptop */
+	{ { 0x20, 0x02, 0x0e },	0x00, ALPS_PROTO_V2, 0xf8, 0xf8, ALPS_PASS | ALPS_DUALPOINT },	/* XXX */
+	{ { 0x22, 0x02, 0x0a },	0x00, ALPS_PROTO_V2, 0xf8, 0xf8, ALPS_PASS | ALPS_DUALPOINT },
+	{ { 0x22, 0x02, 0x14 }, 0x00, ALPS_PROTO_V2, 0xff, 0xff, ALPS_PASS | ALPS_DUALPOINT },	/* Dell Latitude D600 */
+	/* Dell Latitude E5500, E6400, E6500, Precision M4400 */
+	{ { 0x62, 0x02, 0x14 }, 0x00, ALPS_PROTO_V2, 0xcf, 0xcf,
+		ALPS_PASS | ALPS_DUALPOINT | ALPS_PS2_INTERLEAVED },
+	{ { 0x73, 0x02, 0x50 }, 0x00, ALPS_PROTO_V2, 0xcf, 0xcf, ALPS_FOUR_BUTTONS },		/* Dell Vostro 1400 */
+	{ { 0x52, 0x01, 0x14 }, 0x00, ALPS_PROTO_V2, 0xff, 0xff,
+		ALPS_PASS | ALPS_DUALPOINT | ALPS_PS2_INTERLEAVED },				/* Toshiba Tecra A11-11L */
+	{ { 0x73, 0x02, 0x64 },	0x8a, ALPS_PROTO_V4, 0x8f, 0x8f, 0 },
+};
+
+static void alps_set_abs_params_st(struct alps_data *priv,
+				   struct input_dev *dev1);
+static void alps_set_abs_params_mt(struct alps_data *priv,
+				   struct input_dev *dev1);
+
+/*
+ * XXX - this entry is suspicious. First byte has zero lower nibble,
+ * which is what a normal mouse would report. Also, the value 0x0e
+ * isn't valid per PS/2 spec.
+ */
+
+/* Packet formats are described in Documentation/input/alps.txt */
+
+static bool alps_is_valid_first_byte(struct alps_data *priv,
+				     unsigned char data)
+{
+	return (data & priv->mask0) == priv->byte0;
+}
+
+static void alps_report_buttons(struct psmouse *psmouse,
+				struct input_dev *dev1, struct input_dev *dev2,
+				int left, int right, int middle)
+{
+	struct input_dev *dev;
+
+	/*
+	 * If shared button has already been reported on the
+	 * other device (dev2) then this event should be also
+	 * sent through that device.
+	 */
+	dev = test_bit(BTN_LEFT, dev2->key) ? dev2 : dev1;
+	input_report_key(dev, BTN_LEFT, left);
+
+	dev = test_bit(BTN_RIGHT, dev2->key) ? dev2 : dev1;
+	input_report_key(dev, BTN_RIGHT, right);
+
+	dev = test_bit(BTN_MIDDLE, dev2->key) ? dev2 : dev1;
+	input_report_key(dev, BTN_MIDDLE, middle);
+
+	/*
+	 * Sync the _other_ device now, we'll do the first
+	 * device later once we report the rest of the events.
+	 */
+	input_sync(dev2);
+}
+
+static void alps_process_packet_v1_v2(struct psmouse *psmouse)
+{
+	struct alps_data *priv = psmouse->private;
+	unsigned char *packet = psmouse->packet;
+	struct input_dev *dev = psmouse->dev;
+	struct input_dev *dev2 = priv->dev2;
+	int x, y, z, ges, fin, left, right, middle;
+	int back = 0, forward = 0;
+
+	if (priv->proto_version == ALPS_PROTO_V1) {
+		left = packet[2] & 0x10;
+		right = packet[2] & 0x08;
+		middle = 0;
+		x = packet[1] | ((packet[0] & 0x07) << 7);
+		y = packet[4] | ((packet[3] & 0x07) << 7);
+		z = packet[5];
+	} else {
+		left = packet[3] & 1;
+		right = packet[3] & 2;
+		middle = packet[3] & 4;
+		x = packet[1] | ((packet[2] & 0x78) << (7 - 3));
+		y = packet[4] | ((packet[3] & 0x70) << (7 - 4));
+		z = packet[5];
+	}
+
+	if (priv->flags & ALPS_FW_BK_1) {
+		back = packet[0] & 0x10;
+		forward = packet[2] & 4;
+	}
+
+	if (priv->flags & ALPS_FW_BK_2) {
+		back = packet[3] & 4;
+		forward = packet[2] & 4;
+		if ((middle = forward && back))
+			forward = back = 0;
+	}
+
+	ges = packet[2] & 1;
+	fin = packet[2] & 2;
+
+	if ((priv->flags & ALPS_DUALPOINT) && z == 127) {
+		input_report_rel(dev2, REL_X,  (x > 383 ? (x - 768) : x));
+		input_report_rel(dev2, REL_Y, -(y > 255 ? (y - 512) : y));
+
+		alps_report_buttons(psmouse, dev2, dev, left, right, middle);
+
+		input_sync(dev2);
+		return;
+	}
+
+	alps_report_buttons(psmouse, dev, dev2, left, right, middle);
+
+	/* Convert hardware tap to a reasonable Z value */
+	if (ges && !fin)
+		z = 40;
+
+	/*
+	 * A "tap and drag" operation is reported by the hardware as a transition
+	 * from (!fin && ges) to (fin && ges). This should be translated to the
+	 * sequence Z>0, Z==0, Z>0, so the Z==0 event has to be generated manually.
+	 */
+	if (ges && fin && !priv->prev_fin) {
+		input_report_abs(dev, ABS_X, x);
+		input_report_abs(dev, ABS_Y, y);
+		input_report_abs(dev, ABS_PRESSURE, 0);
+		input_report_key(dev, BTN_TOOL_FINGER, 0);
+		input_sync(dev);
+	}
+	priv->prev_fin = fin;
+
+	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);
+
+	if (priv->flags & ALPS_WHEEL)
+		input_report_rel(dev, REL_WHEEL, ((packet[2] << 1) & 0x08) - ((packet[0] >> 4) & 0x07));
+
+	if (priv->flags & (ALPS_FW_BK_1 | ALPS_FW_BK_2)) {
+		input_report_key(dev, BTN_FORWARD, forward);
+		input_report_key(dev, BTN_BACK, back);
+	}
+
+	if (priv->flags & ALPS_FOUR_BUTTONS) {
+		input_report_key(dev, BTN_0, packet[2] & 4);
+		input_report_key(dev, BTN_1, packet[0] & 0x10);
+		input_report_key(dev, BTN_2, packet[3] & 4);
+		input_report_key(dev, BTN_3, packet[0] & 0x20);
+	}
+
+	input_sync(dev);
+}
+
+/*
+ * Process bitmap data from v3 and v4 protocols. Returns the number of
+ * fingers detected. A return value of 0 means at least one of the
+ * bitmaps was empty.
+ *
+ * The bitmaps don't have enough data to track fingers, so this function
+ * only generates points representing a bounding box of all contacts.
+ * These points are returned in x1, y1, x2, and y2 when the return value
+ * is greater than 0.
+ */
+static int alps_process_bitmap(struct alps_data *priv,
+			       unsigned int x_map, unsigned int y_map,
+			       int *x1, int *y1, int *x2, int *y2)
+{
+	struct alps_bitmap_point {
+		int start_bit;
+		int num_bits;
+	};
+
+	int fingers_x = 0, fingers_y = 0, fingers;
+	int i, bit, prev_bit;
+	struct alps_bitmap_point x_low = {0,}, x_high = {0,};
+	struct alps_bitmap_point y_low = {0,}, y_high = {0,};
+	struct alps_bitmap_point *point;
+
+	if (!x_map || !y_map)
+		return 0;
+
+	*x1 = *y1 = *x2 = *y2 = 0;
+
+	prev_bit = 0;
+	point = &x_low;
+	for (i = 0; x_map != 0; i++, x_map >>= 1) {
+		bit = x_map & 1;
+		if (bit) {
+			if (!prev_bit) {
+				point->start_bit = i;
+				fingers_x++;
+			}
+			point->num_bits++;
+		} else {
+			if (prev_bit)
+				point = &x_high;
+			else
+				point->num_bits = 0;
+		}
+		prev_bit = bit;
+	}
+
+	/*
+	 * y bitmap is reversed for what we need (lower positions are in
+	 * higher bits), so we process from the top end.
+	 */
+	y_map = y_map << (sizeof(y_map) * BITS_PER_BYTE - priv->y_bits);
+	prev_bit = 0;
+	point = &y_low;
+	for (i = 0; y_map != 0; i++, y_map <<= 1) {
+		bit = y_map & (1 << (sizeof(y_map) * BITS_PER_BYTE - 1));
+		if (bit) {
+			if (!prev_bit) {
+				point->start_bit = i;
+				fingers_y++;
+			}
+			point->num_bits++;
+		} else {
+			if (prev_bit)
+				point = &y_high;
+			else
+				point->num_bits = 0;
+		}
+		prev_bit = bit;
+	}
+
+	/*
+	 * Fingers can overlap, so we use the maximum count of fingers
+	 * on either axis as the finger count.
+	 */
+	fingers = max(fingers_x, fingers_y);
+
+	/*
+	 * If total fingers is > 1 but either axis reports only a single
+	 * contact, we have overlapping or adjacent fingers. For the
+	 * purposes of creating a bounding box, divide the single contact
+	 * (roughly) equally between the two points.
+	 */
+	if (fingers > 1) {
+		if (fingers_x == 1) {
+			i = x_low.num_bits / 2;
+			x_low.num_bits = x_low.num_bits - i;
+			x_high.start_bit = x_low.start_bit + i;
+			x_high.num_bits = max(i, 1);
+		} else if (fingers_y == 1) {
+			i = y_low.num_bits / 2;
+			y_low.num_bits = y_low.num_bits - i;
+			y_high.start_bit = y_low.start_bit + i;
+			y_high.num_bits = max(i, 1);
+		}
+	}
+
+	*x1 = (priv->x_max * (2 * x_low.start_bit + x_low.num_bits - 1)) /
+	      (2 * (priv->x_bits - 1));
+	*y1 = (priv->y_max * (2 * y_low.start_bit + y_low.num_bits - 1)) /
+	      (2 * (priv->y_bits - 1));
+
+	if (fingers > 1) {
+		*x2 = (priv->x_max *
+		       (2 * x_high.start_bit + x_high.num_bits - 1)) /
+		      (2 * (priv->x_bits - 1));
+		*y2 = (priv->y_max *
+		       (2 * y_high.start_bit + y_high.num_bits - 1)) /
+		      (2 * (priv->y_bits - 1));
+	}
+
+	return fingers;
+}
+
+static void alps_set_slot(struct input_dev *dev, int slot, bool active,
+			  int x, int y)
+{
+	input_mt_slot(dev, slot);
+	input_mt_report_slot_state(dev, MT_TOOL_FINGER, active);
+	if (active) {
+		input_report_abs(dev, ABS_MT_POSITION_X, x);
+		input_report_abs(dev, ABS_MT_POSITION_Y, y);
+	}
+}
+
+static void alps_report_semi_mt_data(struct input_dev *dev, int num_fingers,
+				     int x1, int y1, int x2, int y2)
+{
+	alps_set_slot(dev, 0, num_fingers != 0, x1, y1);
+	alps_set_slot(dev, 1, num_fingers == 2, x2, y2);
+}
+
+static void alps_process_trackstick_packet_v3(struct psmouse *psmouse)
+{
+	struct alps_data *priv = psmouse->private;
+	unsigned char *packet = psmouse->packet;
+	struct input_dev *dev = priv->dev2;
+	int x, y, z, left, right, middle;
+
+	/* Sanity check packet */
+	if (!(packet[0] & 0x40)) {
+		psmouse_dbg(psmouse, "Bad trackstick packet, discarding\n");
+		return;
+	}
+
+	/*
+	 * There's a special packet that seems to indicate the end
+	 * of a stream of trackstick data. Filter these out.
+	 */
+	if (packet[1] == 0x7f && packet[2] == 0x7f && packet[4] == 0x7f)
+		return;
+
+	x = (s8)(((packet[0] & 0x20) << 2) | (packet[1] & 0x7f));
+	y = (s8)(((packet[0] & 0x10) << 3) | (packet[2] & 0x7f));
+	z = (packet[4] & 0x7c) >> 2;
+
+	/*
+	 * The x and y values tend to be quite large, and when used
+	 * alone the trackstick is difficult to use. Scale them down
+	 * to compensate.
+	 */
+	x /= 8;
+	y /= 8;
+
+	input_report_rel(dev, REL_X, x);
+	input_report_rel(dev, REL_Y, -y);
+
+	/*
+	 * Most ALPS models report the trackstick buttons in the touchpad
+	 * packets, but a few report them here. No reliable way has been
+	 * found to differentiate between the models upfront, so we enable
+	 * the quirk in response to seeing a button press in the trackstick
+	 * packet.
+	 */
+	left = packet[3] & 0x01;
+	right = packet[3] & 0x02;
+	middle = packet[3] & 0x04;
+
+	if (!(priv->quirks & ALPS_QUIRK_TRACKSTICK_BUTTONS) &&
+	    (left || right || middle))
+		priv->quirks |= ALPS_QUIRK_TRACKSTICK_BUTTONS;
+
+	if (priv->quirks & ALPS_QUIRK_TRACKSTICK_BUTTONS) {
+		input_report_key(dev, BTN_LEFT, left);
+		input_report_key(dev, BTN_RIGHT, right);
+		input_report_key(dev, BTN_MIDDLE, middle);
+	}
+
+	input_sync(dev);
+	return;
+}
+
+static void alps_decode_buttons_v3(struct alps_fields *f, unsigned char *p)
+{
+	f->left = !!(p[3] & 0x01);
+	f->right = !!(p[3] & 0x02);
+	f->middle = !!(p[3] & 0x04);
+
+	f->ts_left = !!(p[3] & 0x10);
+	f->ts_right = !!(p[3] & 0x20);
+	f->ts_middle = !!(p[3] & 0x40);
+}
+
+static void alps_decode_pinnacle(struct alps_fields *f, unsigned char *p)
+{
+	f->first_mp = !!(p[4] & 0x40);
+	f->is_mp = !!(p[0] & 0x40);
+
+	f->fingers = (p[5] & 0x3) + 1;
+	f->x_map = ((p[4] & 0x7e) << 8) |
+		   ((p[1] & 0x7f) << 2) |
+		   ((p[0] & 0x30) >> 4);
+	f->y_map = ((p[3] & 0x70) << 4) |
+		   ((p[2] & 0x7f) << 1) |
+		   (p[4] & 0x01);
+
+	f->x = ((p[1] & 0x7f) << 4) | ((p[4] & 0x30) >> 2) |
+	       ((p[0] & 0x30) >> 4);
+	f->y = ((p[2] & 0x7f) << 4) | (p[4] & 0x0f);
+	f->z = p[5] & 0x7f;
+
+	alps_decode_buttons_v3(f, p);
+}
+
+static void alps_decode_rushmore(struct alps_fields *f, unsigned char *p)
+{
+	alps_decode_pinnacle(f, p);
+
+	f->x_map |= (p[5] & 0x10) << 11;
+	f->y_map |= (p[5] & 0x20) << 6;
+}
+
+static void alps_decode_dolphin(struct alps_fields *f, unsigned char *p)
+{
+	f->first_mp = !!(p[0] & 0x02);
+	f->is_mp = !!(p[0] & 0x20);
+
+	f->fingers = ((p[0] & 0x6) >> 1 |
+		     (p[0] & 0x10) >> 2);
+	f->x_map = ((p[2] & 0x60) >> 5) |
+		   ((p[4] & 0x7f) << 2) |
+		   ((p[5] & 0x7f) << 9) |
+		   ((p[3] & 0x07) << 16) |
+		   ((p[3] & 0x70) << 15) |
+		   ((p[0] & 0x01) << 22);
+	f->y_map = (p[1] & 0x7f) |
+		   ((p[2] & 0x1f) << 7);
+
+	f->x = ((p[1] & 0x7f) | ((p[4] & 0x0f) << 7));
+	f->y = ((p[2] & 0x7f) | ((p[4] & 0xf0) << 3));
+	f->z = (p[0] & 4) ? 0 : p[5] & 0x7f;
+
+	alps_decode_buttons_v3(f, p);
+}
+
+static void alps_process_touchpad_packet_v3(struct psmouse *psmouse)
+{
+	struct alps_data *priv = psmouse->private;
+	unsigned char *packet = psmouse->packet;
+	struct input_dev *dev = psmouse->dev;
+	struct input_dev *dev2 = priv->dev2;
+	int x1 = 0, y1 = 0, x2 = 0, y2 = 0;
+	int fingers = 0, bmap_fingers;
+	struct alps_fields f;
+
+	priv->decode_fields(&f, packet);
+
+	/*
+	 * There's no single feature of touchpad position and bitmap packets
+	 * that can be used to distinguish between them. We rely on the fact
+	 * that a bitmap packet should always follow a position packet with
+	 * bit 6 of packet[4] set.
+	 */
+	if (priv->multi_packet) {
+		/*
+		 * Sometimes a position packet will indicate a multi-packet
+		 * sequence, but then what follows is another position
+		 * packet. Check for this, and when it happens process the
+		 * position packet as usual.
+		 */
+		if (f.is_mp) {
+			fingers = f.fingers;
+			bmap_fingers = alps_process_bitmap(priv,
+							   f.x_map, f.y_map,
+							   &x1, &y1, &x2, &y2);
+
+			/*
+			 * We shouldn't report more than one finger if
+			 * we don't have two coordinates.
+			 */
+			if (fingers > 1 && bmap_fingers < 2)
+				fingers = bmap_fingers;
+
+			/* Now process position packet */
+			priv->decode_fields(&f, priv->multi_data);
+		} else {
+			priv->multi_packet = 0;
+		}
+	}
+
+	/*
+	 * Bit 6 of byte 0 is not usually set in position packets. The only
+	 * times it seems to be set is in situations where the data is
+	 * suspect anyway, e.g. a palm resting flat on the touchpad. Given
+	 * this combined with the fact that this bit is useful for filtering
+	 * out misidentified bitmap packets, we reject anything with this
+	 * bit set.
+	 */
+	if (f.is_mp)
+		return;
+
+	if (!priv->multi_packet && f.first_mp) {
+		priv->multi_packet = 1;
+		memcpy(priv->multi_data, packet, sizeof(priv->multi_data));
+		return;
+	}
+
+	priv->multi_packet = 0;
+
+	/*
+	 * Sometimes the hardware sends a single packet with z = 0
+	 * in the middle of a stream. Real releases generate packets
+	 * with x, y, and z all zero, so these seem to be flukes.
+	 * Ignore them.
+	 */
+	if (f.x && f.y && !f.z)
+		return;
+
+	/*
+	 * If we don't have MT data or the bitmaps were empty, we have
+	 * to rely on ST data.
+	 */
+	if (!fingers) {
+		x1 = f.x;
+		y1 = f.y;
+		fingers = f.z > 0 ? 1 : 0;
+	}
+
+	if (f.z >= 64)
+		input_report_key(dev, BTN_TOUCH, 1);
+	else
+		input_report_key(dev, BTN_TOUCH, 0);
+
+	alps_report_semi_mt_data(dev, fingers, x1, y1, x2, y2);
+
+	input_mt_report_finger_count(dev, fingers);
+
+	input_report_key(dev, BTN_LEFT, f.left);
+	input_report_key(dev, BTN_RIGHT, f.right);
+	input_report_key(dev, BTN_MIDDLE, f.middle);
+
+	if (f.z > 0) {
+		input_report_abs(dev, ABS_X, f.x);
+		input_report_abs(dev, ABS_Y, f.y);
+	}
+	input_report_abs(dev, ABS_PRESSURE, f.z);
+
+	input_sync(dev);
+
+	if (!(priv->quirks & ALPS_QUIRK_TRACKSTICK_BUTTONS)) {
+		input_report_key(dev2, BTN_LEFT, f.ts_left);
+		input_report_key(dev2, BTN_RIGHT, f.ts_right);
+		input_report_key(dev2, BTN_MIDDLE, f.ts_middle);
+		input_sync(dev2);
+	}
+}
+
+static void alps_process_packet_v3(struct psmouse *psmouse)
+{
+	unsigned char *packet = psmouse->packet;
+
+	/*
+	 * v3 protocol packets come in three types, two representing
+	 * touchpad data and one representing trackstick data.
+	 * Trackstick packets seem to be distinguished by always
+	 * having 0x3f in the last byte. This value has never been
+	 * observed in the last byte of either of the other types
+	 * of packets.
+	 */
+	if (packet[5] == 0x3f) {
+		alps_process_trackstick_packet_v3(psmouse);
+		return;
+	}
+
+	alps_process_touchpad_packet_v3(psmouse);
+}
+
+static void alps_process_packet_v4(struct psmouse *psmouse)
+{
+	struct alps_data *priv = psmouse->private;
+	unsigned char *packet = psmouse->packet;
+	struct input_dev *dev = psmouse->dev;
+	int offset;
+	int x, y, z;
+	int left, right;
+	int x1, y1, x2, y2;
+	int fingers = 0;
+	unsigned int x_bitmap, y_bitmap;
+
+	/*
+	 * v4 has a 6-byte encoding for bitmap data, but this data is
+	 * broken up between 3 normal packets. Use priv->multi_packet to
+	 * track our position in the bitmap packet.
+	 */
+	if (packet[6] & 0x40) {
+		/* sync, reset position */
+		priv->multi_packet = 0;
+	}
+
+	if (WARN_ON_ONCE(priv->multi_packet > 2))
+		return;
+
+	offset = 2 * priv->multi_packet;
+	priv->multi_data[offset] = packet[6];
+	priv->multi_data[offset + 1] = packet[7];
+
+	if (++priv->multi_packet > 2) {
+		priv->multi_packet = 0;
+
+		x_bitmap = ((priv->multi_data[2] & 0x1f) << 10) |
+			   ((priv->multi_data[3] & 0x60) << 3) |
+			   ((priv->multi_data[0] & 0x3f) << 2) |
+			   ((priv->multi_data[1] & 0x60) >> 5);
+		y_bitmap = ((priv->multi_data[5] & 0x01) << 10) |
+			   ((priv->multi_data[3] & 0x1f) << 5) |
+			    (priv->multi_data[1] & 0x1f);
+
+		fingers = alps_process_bitmap(priv, x_bitmap, y_bitmap,
+					      &x1, &y1, &x2, &y2);
+
+		/* Store MT data.*/
+		priv->fingers = fingers;
+		priv->x1 = x1;
+		priv->x2 = x2;
+		priv->y1 = y1;
+		priv->y2 = y2;
+	}
+
+	left = packet[4] & 0x01;
+	right = packet[4] & 0x02;
+
+	x = ((packet[1] & 0x7f) << 4) | ((packet[3] & 0x30) >> 2) |
+	    ((packet[0] & 0x30) >> 4);
+	y = ((packet[2] & 0x7f) << 4) | (packet[3] & 0x0f);
+	z = packet[5] & 0x7f;
+
+	/*
+	 * If there were no contacts in the bitmap, use ST
+	 * points in MT reports.
+	 * If there were two contacts or more, report MT data.
+	 */
+	if (priv->fingers < 2) {
+		x1 = x;
+		y1 = y;
+		fingers = z > 0 ? 1 : 0;
+	} else {
+		fingers = priv->fingers;
+		x1 = priv->x1;
+		x2 = priv->x2;
+		y1 = priv->y1;
+		y2 = priv->y2;
+	}
+
+	if (z >= 64)
+		input_report_key(dev, BTN_TOUCH, 1);
+	else
+		input_report_key(dev, BTN_TOUCH, 0);
+
+	alps_report_semi_mt_data(dev, fingers, x1, y1, x2, y2);
+
+	input_mt_report_finger_count(dev, fingers);
+
+	input_report_key(dev, BTN_LEFT, left);
+	input_report_key(dev, BTN_RIGHT, right);
+
+	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_sync(dev);
+}
+
+static void alps_report_bare_ps2_packet(struct psmouse *psmouse,
+					unsigned char packet[],
+					bool report_buttons)
+{
+	struct alps_data *priv = psmouse->private;
+	struct input_dev *dev2 = priv->dev2;
+
+	if (report_buttons)
+		alps_report_buttons(psmouse, dev2, psmouse->dev,
+				packet[0] & 1, packet[0] & 2, packet[0] & 4);
+
+	input_report_rel(dev2, REL_X,
+		packet[1] ? packet[1] - ((packet[0] << 4) & 0x100) : 0);
+	input_report_rel(dev2, REL_Y,
+		packet[2] ? ((packet[0] << 3) & 0x100) - packet[2] : 0);
+
+	input_sync(dev2);
+}
+
+static psmouse_ret_t alps_handle_interleaved_ps2(struct psmouse *psmouse)
+{
+	struct alps_data *priv = psmouse->private;
+
+	if (psmouse->pktcnt < 6)
+		return PSMOUSE_GOOD_DATA;
+
+	if (psmouse->pktcnt == 6) {
+		/*
+		 * Start a timer to flush the packet if it ends up last
+		 * 6-byte packet in the stream. Timer needs to fire
+		 * psmouse core times out itself. 20 ms should be enough
+		 * to decide if we are getting more data or not.
+		 */
+		mod_timer(&priv->timer, jiffies + msecs_to_jiffies(20));
+		return PSMOUSE_GOOD_DATA;
+	}
+
+	del_timer(&priv->timer);
+
+	if (psmouse->packet[6] & 0x80) {
+
+		/*
+		 * Highest bit is set - that means we either had
+		 * complete ALPS packet and this is start of the
+		 * next packet or we got garbage.
+		 */
+
+		if (((psmouse->packet[3] |
+		      psmouse->packet[4] |
+		      psmouse->packet[5]) & 0x80) ||
+		    (!alps_is_valid_first_byte(priv, psmouse->packet[6]))) {
+			psmouse_dbg(psmouse,
+				    "refusing packet %4ph (suspected interleaved ps/2)\n",
+				    psmouse->packet + 3);
+			return PSMOUSE_BAD_DATA;
+		}
+
+		priv->process_packet(psmouse);
+
+		/* Continue with the next packet */
+		psmouse->packet[0] = psmouse->packet[6];
+		psmouse->pktcnt = 1;
+
+	} else {
+
+		/*
+		 * High bit is 0 - that means that we indeed got a PS/2
+		 * packet in the middle of ALPS packet.
+		 *
+		 * There is also possibility that we got 6-byte ALPS
+		 * packet followed  by 3-byte packet from trackpoint. We
+		 * can not distinguish between these 2 scenarios but
+		 * because the latter is unlikely to happen in course of
+		 * normal operation (user would need to press all
+		 * buttons on the pad and start moving trackpoint
+		 * without touching the pad surface) we assume former.
+		 * Even if we are wrong the wost thing that would happen
+		 * the cursor would jump but we should not get protocol
+		 * de-synchronization.
+		 */
+
+		alps_report_bare_ps2_packet(psmouse, &psmouse->packet[3],
+					    false);
+
+		/*
+		 * Continue with the standard ALPS protocol handling,
+		 * but make sure we won't process it as an interleaved
+		 * packet again, which may happen if all buttons are
+		 * pressed. To avoid this let's reset the 4th bit which
+		 * is normally 1.
+		 */
+		psmouse->packet[3] = psmouse->packet[6] & 0xf7;
+		psmouse->pktcnt = 4;
+	}
+
+	return PSMOUSE_GOOD_DATA;
+}
+
+static void alps_flush_packet(unsigned long data)
+{
+	struct psmouse *psmouse = (struct psmouse *)data;
+	struct alps_data *priv = psmouse->private;
+
+	serio_pause_rx(psmouse->ps2dev.serio);
+
+	if (psmouse->pktcnt == psmouse->pktsize) {
+
+		/*
+		 * We did not any more data in reasonable amount of time.
+		 * Validate the last 3 bytes and process as a standard
+		 * ALPS packet.
+		 */
+		if ((psmouse->packet[3] |
+		     psmouse->packet[4] |
+		     psmouse->packet[5]) & 0x80) {
+			psmouse_dbg(psmouse,
+				    "refusing packet %3ph (suspected interleaved ps/2)\n",
+				    psmouse->packet + 3);
+		} else {
+			priv->process_packet(psmouse);
+		}
+		psmouse->pktcnt = 0;
+	}
+
+	serio_continue_rx(psmouse->ps2dev.serio);
+}
+
+static psmouse_ret_t alps_process_byte(struct psmouse *psmouse)
+{
+	struct alps_data *priv = psmouse->private;
+
+	/*
+	 * Check if we are dealing with a bare PS/2 packet, presumably from
+	 * a device connected to the external PS/2 port. Because bare PS/2
+	 * protocol does not have enough constant bits to self-synchronize
+	 * properly we only do this if the device is fully synchronized.
+	 */
+	if (!psmouse->out_of_sync_cnt && (psmouse->packet[0] & 0xc8) == 0x08) {
+		if (psmouse->pktcnt == 3) {
+			alps_report_bare_ps2_packet(psmouse, psmouse->packet,
+						    true);
+			return PSMOUSE_FULL_PACKET;
+		}
+		return PSMOUSE_GOOD_DATA;
+	}
+
+	/* Check for PS/2 packet stuffed in the middle of ALPS packet. */
+
+	if ((priv->flags & ALPS_PS2_INTERLEAVED) &&
+	    psmouse->pktcnt >= 4 && (psmouse->packet[3] & 0x0f) == 0x0f) {
+		return alps_handle_interleaved_ps2(psmouse);
+	}
+
+	if (!alps_is_valid_first_byte(priv, psmouse->packet[0])) {
+		psmouse_dbg(psmouse,
+			    "refusing packet[0] = %x (mask0 = %x, byte0 = %x)\n",
+			    psmouse->packet[0], priv->mask0, priv->byte0);
+		return PSMOUSE_BAD_DATA;
+	}
+
+	/* Bytes 2 - pktsize should have 0 in the highest bit */
+	if (priv->proto_version != ALPS_PROTO_V5 &&
+	    psmouse->pktcnt >= 2 && psmouse->pktcnt <= psmouse->pktsize &&
+	    (psmouse->packet[psmouse->pktcnt - 1] & 0x80)) {
+		psmouse_dbg(psmouse, "refusing packet[%i] = %x\n",
+			    psmouse->pktcnt - 1,
+			    psmouse->packet[psmouse->pktcnt - 1]);
+		return PSMOUSE_BAD_DATA;
+	}
+
+	if (psmouse->pktcnt == psmouse->pktsize) {
+		priv->process_packet(psmouse);
+		return PSMOUSE_FULL_PACKET;
+	}
+
+	return PSMOUSE_GOOD_DATA;
+}
+
+static int alps_command_mode_send_nibble(struct psmouse *psmouse, int nibble)
+{
+	struct ps2dev *ps2dev = &psmouse->ps2dev;
+	struct alps_data *priv = psmouse->private;
+	int command;
+	unsigned char *param;
+	unsigned char dummy[4];
+
+	BUG_ON(nibble > 0xf);
+
+	command = priv->nibble_commands[nibble].command;
+	param = (command & 0x0f00) ?
+		dummy : (unsigned char *)&priv->nibble_commands[nibble].data;
+
+	if (ps2_command(ps2dev, param, command))
+		return -1;
+
+	return 0;
+}
+
+static int alps_command_mode_set_addr(struct psmouse *psmouse, int addr)
+{
+	struct ps2dev *ps2dev = &psmouse->ps2dev;
+	struct alps_data *priv = psmouse->private;
+	int i, nibble;
+
+	if (ps2_command(ps2dev, NULL, priv->addr_command))
+		return -1;
+
+	for (i = 12; i >= 0; i -= 4) {
+		nibble = (addr >> i) & 0xf;
+		if (alps_command_mode_send_nibble(psmouse, nibble))
+			return -1;
+	}
+
+	return 0;
+}
+
+static int __alps_command_mode_read_reg(struct psmouse *psmouse, int addr)
+{
+	struct ps2dev *ps2dev = &psmouse->ps2dev;
+	unsigned char param[4];
+
+	if (ps2_command(ps2dev, param, PSMOUSE_CMD_GETINFO))
+		return -1;
+
+	/*
+	 * The address being read is returned in the first two bytes
+	 * of the result. Check that this address matches the expected
+	 * address.
+	 */
+	if (addr != ((param[0] << 8) | param[1]))
+		return -1;
+
+	return param[2];
+}
+
+static int alps_command_mode_read_reg(struct psmouse *psmouse, int addr)
+{
+	if (alps_command_mode_set_addr(psmouse, addr))
+		return -1;
+	return __alps_command_mode_read_reg(psmouse, addr);
+}
+
+static int __alps_command_mode_write_reg(struct psmouse *psmouse, u8 value)
+{
+	if (alps_command_mode_send_nibble(psmouse, (value >> 4) & 0xf))
+		return -1;
+	if (alps_command_mode_send_nibble(psmouse, value & 0xf))
+		return -1;
+	return 0;
+}
+
+static int alps_command_mode_write_reg(struct psmouse *psmouse, int addr,
+				       u8 value)
+{
+	if (alps_command_mode_set_addr(psmouse, addr))
+		return -1;
+	return __alps_command_mode_write_reg(psmouse, value);
+}
+
+static int alps_rpt_cmd(struct psmouse *psmouse, int init_command,
+			int repeated_command, unsigned char *param)
+{
+	struct ps2dev *ps2dev = &psmouse->ps2dev;
+
+	param[0] = 0;
+	if (init_command && ps2_command(ps2dev, param, init_command))
+		return -EIO;
+
+	if (ps2_command(ps2dev,  NULL, repeated_command) ||
+	    ps2_command(ps2dev,  NULL, repeated_command) ||
+	    ps2_command(ps2dev,  NULL, repeated_command))
+		return -EIO;
+
+	param[0] = param[1] = param[2] = 0xff;
+	if (ps2_command(ps2dev, param, PSMOUSE_CMD_GETINFO))
+		return -EIO;
+
+	psmouse_dbg(psmouse, "%2.2X report: %3ph\n",
+		    repeated_command, param);
+	return 0;
+}
+
+static int alps_enter_command_mode(struct psmouse *psmouse)
+{
+	unsigned char param[4];
+
+	if (alps_rpt_cmd(psmouse, 0, PSMOUSE_CMD_RESET_WRAP, param)) {
+		psmouse_err(psmouse, "failed to enter command mode\n");
+		return -1;
+	}
+
+	if ((param[0] != 0x88 || (param[1] != 0x07 && param[1] != 0x08)) &&
+	    param[0] != 0x73) {
+		psmouse_dbg(psmouse,
+			    "unknown response while entering command mode\n");
+		return -1;
+	}
+	return 0;
+}
+
+static inline int alps_exit_command_mode(struct psmouse *psmouse)
+{
+	struct ps2dev *ps2dev = &psmouse->ps2dev;
+	if (ps2_command(ps2dev, NULL, PSMOUSE_CMD_SETSTREAM))
+		return -1;
+	return 0;
+}
+
+/*
+ * 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_v2(struct psmouse *psmouse, bool enable)
+{
+	struct ps2dev *ps2dev = &psmouse->ps2dev;
+	int cmd = enable ? PSMOUSE_CMD_SETSCALE21 : PSMOUSE_CMD_SETSCALE11;
+
+	if (ps2_command(ps2dev, NULL, cmd) ||
+	    ps2_command(ps2dev, NULL, cmd) ||
+	    ps2_command(ps2dev, NULL, cmd) ||
+	    ps2_command(ps2dev, NULL, PSMOUSE_CMD_DISABLE))
+		return -1;
+
+	/* we may get 3 more bytes, just ignore them */
+	ps2_drain(ps2dev, 3, 100);
+
+	return 0;
+}
+
+static int alps_absolute_mode_v1_v2(struct psmouse *psmouse)
+{
+	struct ps2dev *ps2dev = &psmouse->ps2dev;
+
+	/* Try ALPS magic knock - 4 disable before enable */
+	if (ps2_command(ps2dev, NULL, PSMOUSE_CMD_DISABLE) ||
+	    ps2_command(ps2dev, NULL, PSMOUSE_CMD_DISABLE) ||
+	    ps2_command(ps2dev, NULL, PSMOUSE_CMD_DISABLE) ||
+	    ps2_command(ps2dev, NULL, PSMOUSE_CMD_DISABLE) ||
+	    ps2_command(ps2dev, NULL, PSMOUSE_CMD_ENABLE))
+		return -1;
+
+	/*
+	 * Switch mouse to poll (remote) mode so motion data will not
+	 * get in our way
+	 */
+	return ps2_command(&psmouse->ps2dev, NULL, PSMOUSE_CMD_SETPOLL);
+}
+
+static int alps_get_status(struct psmouse *psmouse, char *param)
+{
+	/* Get status: 0xF5 0xF5 0xF5 0xE9 */
+	if (alps_rpt_cmd(psmouse, 0, PSMOUSE_CMD_DISABLE, param))
+		return -1;
+
+	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 enable)
+{
+	struct ps2dev *ps2dev = &psmouse->ps2dev;
+	int cmd = enable ? PSMOUSE_CMD_SETRATE : PSMOUSE_CMD_SETRES;
+	unsigned char tap_arg = enable ? 0x0A : 0x00;
+	unsigned char param[4];
+
+	if (ps2_command(ps2dev, param, PSMOUSE_CMD_GETINFO) ||
+	    ps2_command(ps2dev, NULL, PSMOUSE_CMD_DISABLE) ||
+	    ps2_command(ps2dev, NULL, PSMOUSE_CMD_DISABLE) ||
+	    ps2_command(ps2dev, &tap_arg, cmd))
+		return -1;
+
+	if (alps_get_status(psmouse, param))
+		return -1;
+
+	return 0;
+}
+
+/*
+ * alps_poll() - poll the touchpad for current motion packet.
+ * Used in resync.
+ */
+static int alps_poll(struct psmouse *psmouse)
+{
+	struct alps_data *priv = psmouse->private;
+	unsigned char buf[sizeof(psmouse->packet)];
+	bool poll_failed;
+
+	if (priv->flags & ALPS_PASS)
+		alps_passthrough_mode_v2(psmouse, true);
+
+	poll_failed = ps2_command(&psmouse->ps2dev, buf,
+				  PSMOUSE_CMD_POLL | (psmouse->pktsize << 8)) < 0;
+
+	if (priv->flags & ALPS_PASS)
+		alps_passthrough_mode_v2(psmouse, false);
+
+	if (poll_failed || (buf[0] & priv->mask0) != priv->byte0)
+		return -1;
+
+	if ((psmouse->badbyte & 0xc8) == 0x08) {
+/*
+ * Poll the track stick ...
+ */
+		if (ps2_command(&psmouse->ps2dev, buf, PSMOUSE_CMD_POLL | (3 << 8)))
+			return -1;
+	}
+
+	memcpy(psmouse->packet, buf, sizeof(buf));
+	return 0;
+}
+
+static int alps_hw_init_v1_v2(struct psmouse *psmouse)
+{
+	struct alps_data *priv = psmouse->private;
+
+	if ((priv->flags & ALPS_PASS) &&
+	    alps_passthrough_mode_v2(psmouse, true)) {
+		return -1;
+	}
+
+	if (alps_tap_mode(psmouse, true)) {
+		psmouse_warn(psmouse, "Failed to enable hardware tapping\n");
+		return -1;
+	}
+
+	if (alps_absolute_mode_v1_v2(psmouse)) {
+		psmouse_err(psmouse, "Failed to enable absolute mode\n");
+		return -1;
+	}
+
+	if ((priv->flags & ALPS_PASS) &&
+	    alps_passthrough_mode_v2(psmouse, false)) {
+		return -1;
+	}
+
+	/* ALPS needs stream mode, otherwise it won't report any data */
+	if (ps2_command(&psmouse->ps2dev, NULL, PSMOUSE_CMD_SETSTREAM)) {
+		psmouse_err(psmouse, "Failed to enable stream mode\n");
+		return -1;
+	}
+
+	return 0;
+}
+
+/*
+ * Enable or disable passthrough mode to the trackstick.
+ */
+static int alps_passthrough_mode_v3(struct psmouse *psmouse,
+				    int reg_base, bool enable)
+{
+	int reg_val, ret = -1;
+
+	if (alps_enter_command_mode(psmouse))
+		return -1;
+
+	reg_val = alps_command_mode_read_reg(psmouse, reg_base + 0x0008);
+	if (reg_val == -1)
+		goto error;
+
+	if (enable)
+		reg_val |= 0x01;
+	else
+		reg_val &= ~0x01;
+
+	ret = __alps_command_mode_write_reg(psmouse, reg_val);
+
+error:
+	if (alps_exit_command_mode(psmouse))
+		ret = -1;
+	return ret;
+}
+
+/* Must be in command mode when calling this function */
+static int alps_absolute_mode_v3(struct psmouse *psmouse)
+{
+	int reg_val;
+
+	reg_val = alps_command_mode_read_reg(psmouse, 0x0004);
+	if (reg_val == -1)
+		return -1;
+
+	reg_val |= 0x06;
+	if (__alps_command_mode_write_reg(psmouse, reg_val))
+		return -1;
+
+	return 0;
+}
+
+static int alps_probe_trackstick_v3(struct psmouse *psmouse, int reg_base)
+{
+	int ret = -EIO, reg_val;
+
+	if (alps_enter_command_mode(psmouse))
+		goto error;
+
+	reg_val = alps_command_mode_read_reg(psmouse, reg_base + 0x08);
+	if (reg_val == -1)
+		goto error;
+
+	/* bit 7: trackstick is present */
+	ret = reg_val & 0x80 ? 0 : -ENODEV;
+
+error:
+	alps_exit_command_mode(psmouse);
+	return ret;
+}
+
+static int alps_setup_trackstick_v3(struct psmouse *psmouse, int reg_base)
+{
+	struct ps2dev *ps2dev = &psmouse->ps2dev;
+	int ret = 0;
+	unsigned char param[4];
+
+	if (alps_passthrough_mode_v3(psmouse, reg_base, true))
+		return -EIO;
+
+	/*
+	 * E7 report for the trackstick
+	 *
+	 * There have been reports of failures to seem to trace back
+	 * to the above trackstick check failing. When these occur
+	 * this E7 report fails, so when that happens we continue
+	 * with the assumption that there isn't a trackstick after
+	 * all.
+	 */
+	if (alps_rpt_cmd(psmouse, 0, PSMOUSE_CMD_SETSCALE21, param)) {
+		psmouse_warn(psmouse, "trackstick E7 report failed\n");
+		ret = -ENODEV;
+	} else {
+		psmouse_dbg(psmouse, "trackstick E7 report: %3ph\n", param);
+
+		/*
+		 * Not sure what this does, but it is absolutely
+		 * essential. Without it, the touchpad does not
+		 * work at all and the trackstick just emits normal
+		 * PS/2 packets.
+		 */
+		if (ps2_command(ps2dev, NULL, PSMOUSE_CMD_SETSCALE11) ||
+		    ps2_command(ps2dev, NULL, PSMOUSE_CMD_SETSCALE11) ||
+		    ps2_command(ps2dev, NULL, PSMOUSE_CMD_SETSCALE11) ||
+		    alps_command_mode_send_nibble(psmouse, 0x9) ||
+		    alps_command_mode_send_nibble(psmouse, 0x4)) {
+			psmouse_err(psmouse,
+				    "Error sending magic E6 sequence\n");
+			ret = -EIO;
+			goto error;
+		}
+
+		/*
+		 * This ensures the trackstick packets are in the format
+		 * supported by this driver. If bit 1 isn't set the packet
+		 * format is different.
+		 */
+		if (alps_enter_command_mode(psmouse) ||
+		    alps_command_mode_write_reg(psmouse,
+						reg_base + 0x08, 0x82) ||
+		    alps_exit_command_mode(psmouse))
+			ret = -EIO;
+	}
+
+error:
+	if (alps_passthrough_mode_v3(psmouse, reg_base, false))
+		ret = -EIO;
+
+	return ret;
+}
+
+static int alps_hw_init_v3(struct psmouse *psmouse)
+{
+	struct ps2dev *ps2dev = &psmouse->ps2dev;
+	int reg_val;
+	unsigned char param[4];
+
+	reg_val = alps_probe_trackstick_v3(psmouse, ALPS_REG_BASE_PINNACLE);
+	if (reg_val == -EIO)
+		goto error;
+
+	if (reg_val == 0 &&
+	    alps_setup_trackstick_v3(psmouse, ALPS_REG_BASE_PINNACLE) == -EIO)
+		goto error;
+
+	if (alps_enter_command_mode(psmouse) ||
+	    alps_absolute_mode_v3(psmouse)) {
+		psmouse_err(psmouse, "Failed to enter absolute mode\n");
+		goto error;
+	}
+
+	reg_val = alps_command_mode_read_reg(psmouse, 0x0006);
+	if (reg_val == -1)
+		goto error;
+	if (__alps_command_mode_write_reg(psmouse, reg_val | 0x01))
+		goto error;
+
+	reg_val = alps_command_mode_read_reg(psmouse, 0x0007);
+	if (reg_val == -1)
+		goto error;
+	if (__alps_command_mode_write_reg(psmouse, reg_val | 0x01))
+		goto error;
+
+	if (alps_command_mode_read_reg(psmouse, 0x0144) == -1)
+		goto error;
+	if (__alps_command_mode_write_reg(psmouse, 0x04))
+		goto error;
+
+	if (alps_command_mode_read_reg(psmouse, 0x0159) == -1)
+		goto error;
+	if (__alps_command_mode_write_reg(psmouse, 0x03))
+		goto error;
+
+	if (alps_command_mode_read_reg(psmouse, 0x0163) == -1)
+		goto error;
+	if (alps_command_mode_write_reg(psmouse, 0x0163, 0x03))
+		goto error;
+
+	if (alps_command_mode_read_reg(psmouse, 0x0162) == -1)
+		goto error;
+	if (alps_command_mode_write_reg(psmouse, 0x0162, 0x04))
+		goto error;
+
+	alps_exit_command_mode(psmouse);
+
+	/* Set rate and enable data reporting */
+	param[0] = 0x64;
+	if (ps2_command(ps2dev, param, PSMOUSE_CMD_SETRATE) ||
+	    ps2_command(ps2dev, NULL, PSMOUSE_CMD_ENABLE)) {
+		psmouse_err(psmouse, "Failed to enable data reporting\n");
+		return -1;
+	}
+
+	return 0;
+
+error:
+	/*
+	 * Leaving the touchpad in command mode will essentially render
+	 * it unusable until the machine reboots, so exit it here just
+	 * to be safe
+	 */
+	alps_exit_command_mode(psmouse);
+	return -1;
+}
+
+static int alps_hw_init_rushmore_v3(struct psmouse *psmouse)
+{
+	struct alps_data *priv = psmouse->private;
+	struct ps2dev *ps2dev = &psmouse->ps2dev;
+	int reg_val, ret = -1;
+
+	if (priv->flags & ALPS_DUALPOINT) {
+		reg_val = alps_setup_trackstick_v3(psmouse,
+						   ALPS_REG_BASE_RUSHMORE);
+		if (reg_val == -EIO)
+			goto error;
+		if (reg_val == -ENODEV)
+			priv->flags &= ~ALPS_DUALPOINT;
+	}
+
+	if (alps_enter_command_mode(psmouse) ||
+	    alps_command_mode_read_reg(psmouse, 0xc2d9) == -1 ||
+	    alps_command_mode_write_reg(psmouse, 0xc2cb, 0x00))
+		goto error;
+
+	reg_val = alps_command_mode_read_reg(psmouse, 0xc2c6);
+	if (reg_val == -1)
+		goto error;
+	if (__alps_command_mode_write_reg(psmouse, reg_val & 0xfd))
+		goto error;
+
+	if (alps_command_mode_write_reg(psmouse, 0xc2c9, 0x64))
+		goto error;
+
+	/* enter absolute mode */
+	reg_val = alps_command_mode_read_reg(psmouse, 0xc2c4);
+	if (reg_val == -1)
+		goto error;
+	if (__alps_command_mode_write_reg(psmouse, reg_val | 0x02))
+		goto error;
+
+	alps_exit_command_mode(psmouse);
+	return ps2_command(ps2dev, NULL, PSMOUSE_CMD_ENABLE);
+
+error:
+	alps_exit_command_mode(psmouse);
+	return ret;
+}
+
+/* Must be in command mode when calling this function */
+static int alps_absolute_mode_v4(struct psmouse *psmouse)
+{
+	int reg_val;
+
+	reg_val = alps_command_mode_read_reg(psmouse, 0x0004);
+	if (reg_val == -1)
+		return -1;
+
+	reg_val |= 0x02;
+	if (__alps_command_mode_write_reg(psmouse, reg_val))
+		return -1;
+
+	return 0;
+}
+
+static int alps_hw_init_v4(struct psmouse *psmouse)
+{
+	struct ps2dev *ps2dev = &psmouse->ps2dev;
+	unsigned char param[4];
+
+	if (alps_enter_command_mode(psmouse))
+		goto error;
+
+	if (alps_absolute_mode_v4(psmouse)) {
+		psmouse_err(psmouse, "Failed to enter absolute mode\n");
+		goto error;
+	}
+
+	if (alps_command_mode_write_reg(psmouse, 0x0007, 0x8c))
+		goto error;
+
+	if (alps_command_mode_write_reg(psmouse, 0x0149, 0x03))
+		goto error;
+
+	if (alps_command_mode_write_reg(psmouse, 0x0160, 0x03))
+		goto error;
+
+	if (alps_command_mode_write_reg(psmouse, 0x017f, 0x15))
+		goto error;
+
+	if (alps_command_mode_write_reg(psmouse, 0x0151, 0x01))
+		goto error;
+
+	if (alps_command_mode_write_reg(psmouse, 0x0168, 0x03))
+		goto error;
+
+	if (alps_command_mode_write_reg(psmouse, 0x014a, 0x03))
+		goto error;
+
+	if (alps_command_mode_write_reg(psmouse, 0x0161, 0x03))
+		goto error;
+
+	alps_exit_command_mode(psmouse);
+
+	/*
+	 * This sequence changes the output from a 9-byte to an
+	 * 8-byte format. All the same data seems to be present,
+	 * just in a more compact format.
+	 */
+	param[0] = 0xc8;
+	param[1] = 0x64;
+	param[2] = 0x50;
+	if (ps2_command(ps2dev, &param[0], PSMOUSE_CMD_SETRATE) ||
+	    ps2_command(ps2dev, &param[1], PSMOUSE_CMD_SETRATE) ||
+	    ps2_command(ps2dev, &param[2], PSMOUSE_CMD_SETRATE) ||
+	    ps2_command(ps2dev, param, PSMOUSE_CMD_GETID))
+		return -1;
+
+	/* Set rate and enable data reporting */
+	param[0] = 0x64;
+	if (ps2_command(ps2dev, param, PSMOUSE_CMD_SETRATE) ||
+	    ps2_command(ps2dev, NULL, PSMOUSE_CMD_ENABLE)) {
+		psmouse_err(psmouse, "Failed to enable data reporting\n");
+		return -1;
+	}
+
+	return 0;
+
+error:
+	/*
+	 * Leaving the touchpad in command mode will essentially render
+	 * it unusable until the machine reboots, so exit it here just
+	 * to be safe
+	 */
+	alps_exit_command_mode(psmouse);
+	return -1;
+}
+
+static int alps_hw_init_dolphin_v1(struct psmouse *psmouse)
+{
+	struct ps2dev *ps2dev = &psmouse->ps2dev;
+	unsigned char param[2];
+
+	/* This is dolphin "v1" as empirically defined by florin9doi */
+	param[0] = 0x64;
+	param[1] = 0x28;
+
+	if (ps2_command(ps2dev, NULL, PSMOUSE_CMD_SETSTREAM) ||
+	    ps2_command(ps2dev, &param[0], PSMOUSE_CMD_SETRATE) ||
+	    ps2_command(ps2dev, &param[1], PSMOUSE_CMD_SETRATE))
+		return -1;
+
+	return 0;
+}
+
+static void alps_set_defaults(struct alps_data *priv)
+{
+	priv->byte0 = 0x8f;
+	priv->mask0 = 0x8f;
+	priv->flags = ALPS_DUALPOINT;
+
+	priv->x_max = 2000;
+	priv->y_max = 1400;
+	priv->x_bits = 15;
+	priv->y_bits = 11;
+
+	switch (priv->proto_version) {
+	case ALPS_PROTO_V1:
+	case ALPS_PROTO_V2:
+		priv->hw_init = alps_hw_init_v1_v2;
+		priv->process_packet = alps_process_packet_v1_v2;
+		priv->set_abs_params = alps_set_abs_params_st;
+		break;
+	case ALPS_PROTO_V3:
+		priv->hw_init = alps_hw_init_v3;
+		priv->process_packet = alps_process_packet_v3;
+		priv->set_abs_params = alps_set_abs_params_mt;
+		priv->decode_fields = alps_decode_pinnacle;
+		priv->nibble_commands = alps_v3_nibble_commands;
+		priv->addr_command = PSMOUSE_CMD_RESET_WRAP;
+		break;
+	case ALPS_PROTO_V4:
+		priv->hw_init = alps_hw_init_v4;
+		priv->process_packet = alps_process_packet_v4;
+		priv->set_abs_params = alps_set_abs_params_mt;
+		priv->nibble_commands = alps_v4_nibble_commands;
+		priv->addr_command = PSMOUSE_CMD_DISABLE;
+		break;
+	case ALPS_PROTO_V5:
+		priv->hw_init = alps_hw_init_dolphin_v1;
+		priv->process_packet = alps_process_packet_v3;
+		priv->decode_fields = alps_decode_dolphin;
+		priv->set_abs_params = alps_set_abs_params_mt;
+		priv->nibble_commands = alps_v3_nibble_commands;
+		priv->addr_command = PSMOUSE_CMD_RESET_WRAP;
+		priv->byte0 = 0xc8;
+		priv->mask0 = 0xc8;
+		priv->flags = 0;
+		priv->x_max = 1360;
+		priv->y_max = 660;
+		priv->x_bits = 23;
+		priv->y_bits = 12;
+		break;
+	}
+}
+
+static int alps_match_table(struct psmouse *psmouse, struct alps_data *priv,
+			    unsigned char *e7, unsigned char *ec)
+{
+	const struct alps_model_info *model;
+	int i;
+
+	for (i = 0; i < ARRAY_SIZE(alps_model_data); i++) {
+		model = &alps_model_data[i];
+
+		if (!memcmp(e7, model->signature, sizeof(model->signature)) &&
+		    (!model->command_mode_resp ||
+		     model->command_mode_resp == ec[2])) {
+
+			priv->proto_version = model->proto_version;
+			alps_set_defaults(priv);
+
+			priv->flags = model->flags;
+			priv->byte0 = model->byte0;
+			priv->mask0 = model->mask0;
+
+			return 0;
+		}
+	}
+
+	return -EINVAL;
+}
+
+static int alps_identify(struct psmouse *psmouse, struct alps_data *priv)
+{
+	unsigned char e6[4], e7[4], ec[4];
+
+	/*
+	 * First try "E6 report".
+	 * ALPS should return 0,0,10 or 0,0,100 if no buttons are pressed.
+	 * The bits 0-2 of the first byte will be 1s if some buttons are
+	 * pressed.
+	 */
+	if (alps_rpt_cmd(psmouse, PSMOUSE_CMD_SETRES,
+			 PSMOUSE_CMD_SETSCALE11, e6))
+		return -EIO;
+
+	if ((e6[0] & 0xf8) != 0 || e6[1] != 0 || (e6[2] != 10 && e6[2] != 100))
+		return -EINVAL;
+
+	/*
+	 * Now get the "E7" and "EC" reports.  These will uniquely identify
+	 * most ALPS touchpads.
+	 */
+	if (alps_rpt_cmd(psmouse, PSMOUSE_CMD_SETRES,
+			 PSMOUSE_CMD_SETSCALE21, e7) ||
+	    alps_rpt_cmd(psmouse, PSMOUSE_CMD_SETRES,
+			 PSMOUSE_CMD_RESET_WRAP, ec) ||
+	    alps_exit_command_mode(psmouse))
+		return -EIO;
+
+	if (alps_match_table(psmouse, priv, e7, ec) == 0) {
+		return 0;
+	} else if (e7[0] == 0x73 && e7[1] == 0x03 && e7[2] == 0x50 &&
+		   ec[0] == 0x73 && ec[1] == 0x01) {
+		priv->proto_version = ALPS_PROTO_V5;
+		alps_set_defaults(priv);
+
+		return 0;
+	} else if (ec[0] == 0x88 && ec[1] == 0x08) {
+		priv->proto_version = ALPS_PROTO_V3;
+		alps_set_defaults(priv);
+
+		priv->hw_init = alps_hw_init_rushmore_v3;
+		priv->decode_fields = alps_decode_rushmore;
+		priv->x_bits = 16;
+		priv->y_bits = 12;
+
+		/* hack to make addr_command, nibble_command available */
+		psmouse->private = priv;
+
+		if (alps_probe_trackstick_v3(psmouse, ALPS_REG_BASE_RUSHMORE))
+			priv->flags &= ~ALPS_DUALPOINT;
+
+		return 0;
+	} else if (ec[0] == 0x88 && ec[1] == 0x07 &&
+		   ec[2] >= 0x90 && ec[2] <= 0x9d) {
+		priv->proto_version = ALPS_PROTO_V3;
+		alps_set_defaults(priv);
+
+		return 0;
+	}
+
+	psmouse_info(psmouse,
+		     "Unknown ALPS touchpad: E7=%3ph, EC=%3ph\n", e7, ec);
+
+	return -EINVAL;
+}
+
+static int alps_reconnect(struct psmouse *psmouse)
+{
+	struct alps_data *priv = psmouse->private;
+
+	psmouse_reset(psmouse);
+
+	if (alps_identify(psmouse, priv) < 0)
+		return -1;
+
+	return priv->hw_init(psmouse);
+}
+
+static void alps_disconnect(struct psmouse *psmouse)
+{
+	struct alps_data *priv = psmouse->private;
+
+	psmouse_reset(psmouse);
+	del_timer_sync(&priv->timer);
+	input_unregister_device(priv->dev2);
+	kfree(priv);
+}
+
+static void alps_set_abs_params_st(struct alps_data *priv,
+				   struct input_dev *dev1)
+{
+	input_set_abs_params(dev1, ABS_X, 0, 1023, 0, 0);
+	input_set_abs_params(dev1, ABS_Y, 0, 767, 0, 0);
+}
+
+static void alps_set_abs_params_mt(struct alps_data *priv,
+				   struct input_dev *dev1)
+{
+	set_bit(INPUT_PROP_SEMI_MT, dev1->propbit);
+	input_mt_init_slots(dev1, 2, 0);
+	input_set_abs_params(dev1, ABS_MT_POSITION_X, 0, priv->x_max, 0, 0);
+	input_set_abs_params(dev1, ABS_MT_POSITION_Y, 0, priv->y_max, 0, 0);
+
+	set_bit(BTN_TOOL_DOUBLETAP, dev1->keybit);
+	set_bit(BTN_TOOL_TRIPLETAP, dev1->keybit);
+	set_bit(BTN_TOOL_QUADTAP, dev1->keybit);
+
+	input_set_abs_params(dev1, ABS_X, 0, priv->x_max, 0, 0);
+	input_set_abs_params(dev1, ABS_Y, 0, priv->y_max, 0, 0);
+}
+
+int alps_init(struct psmouse *psmouse)
+{
+	struct alps_data *priv;
+	struct input_dev *dev1 = psmouse->dev, *dev2;
+
+	priv = kzalloc(sizeof(struct alps_data), GFP_KERNEL);
+	dev2 = input_allocate_device();
+	if (!priv || !dev2)
+		goto init_fail;
+
+	priv->dev2 = dev2;
+	setup_timer(&priv->timer, alps_flush_packet, (unsigned long)psmouse);
+
+	psmouse->private = priv;
+
+	psmouse_reset(psmouse);
+
+	if (alps_identify(psmouse, priv) < 0)
+		goto init_fail;
+
+	if (priv->hw_init(psmouse))
+		goto init_fail;
+
+	/*
+	 * Undo part of setup done for us by psmouse core since touchpad
+	 * is not a relative device.
+	 */
+	__clear_bit(EV_REL, dev1->evbit);
+	__clear_bit(REL_X, dev1->relbit);
+	__clear_bit(REL_Y, dev1->relbit);
+
+	/*
+	 * Now set up our capabilities.
+	 */
+	dev1->evbit[BIT_WORD(EV_KEY)] |= BIT_MASK(EV_KEY);
+	dev1->keybit[BIT_WORD(BTN_TOUCH)] |= BIT_MASK(BTN_TOUCH);
+	dev1->keybit[BIT_WORD(BTN_TOOL_FINGER)] |= BIT_MASK(BTN_TOOL_FINGER);
+	dev1->keybit[BIT_WORD(BTN_LEFT)] |=
+		BIT_MASK(BTN_LEFT) | BIT_MASK(BTN_RIGHT);
+
+	dev1->evbit[BIT_WORD(EV_ABS)] |= BIT_MASK(EV_ABS);
+
+	priv->set_abs_params(priv, dev1);
+	input_set_abs_params(dev1, ABS_PRESSURE, 0, 127, 0, 0);
+
+	if (priv->flags & ALPS_WHEEL) {
+		dev1->evbit[BIT_WORD(EV_REL)] |= BIT_MASK(EV_REL);
+		dev1->relbit[BIT_WORD(REL_WHEEL)] |= BIT_MASK(REL_WHEEL);
+	}
+
+	if (priv->flags & (ALPS_FW_BK_1 | ALPS_FW_BK_2)) {
+		dev1->keybit[BIT_WORD(BTN_FORWARD)] |= BIT_MASK(BTN_FORWARD);
+		dev1->keybit[BIT_WORD(BTN_BACK)] |= BIT_MASK(BTN_BACK);
+	}
+
+	if (priv->flags & ALPS_FOUR_BUTTONS) {
+		dev1->keybit[BIT_WORD(BTN_0)] |= BIT_MASK(BTN_0);
+		dev1->keybit[BIT_WORD(BTN_1)] |= BIT_MASK(BTN_1);
+		dev1->keybit[BIT_WORD(BTN_2)] |= BIT_MASK(BTN_2);
+		dev1->keybit[BIT_WORD(BTN_3)] |= BIT_MASK(BTN_3);
+	} else {
+		dev1->keybit[BIT_WORD(BTN_MIDDLE)] |= BIT_MASK(BTN_MIDDLE);
+	}
+
+	snprintf(priv->phys, sizeof(priv->phys), "%s/input1", psmouse->ps2dev.serio->phys);
+	dev2->phys = priv->phys;
+	dev2->name = (priv->flags & ALPS_DUALPOINT) ?
+		     "DualPoint Stick" : "PS/2 Mouse";
+	dev2->id.bustype = BUS_I8042;
+	dev2->id.vendor  = 0x0002;
+	dev2->id.product = PSMOUSE_ALPS;
+	dev2->id.version = 0x0000;
+	dev2->dev.parent = &psmouse->ps2dev.serio->dev;
+
+	dev2->evbit[0] = BIT_MASK(EV_KEY) | BIT_MASK(EV_REL);
+	dev2->relbit[BIT_WORD(REL_X)] = BIT_MASK(REL_X) | BIT_MASK(REL_Y);
+	dev2->keybit[BIT_WORD(BTN_LEFT)] =
+		BIT_MASK(BTN_LEFT) | BIT_MASK(BTN_MIDDLE) | BIT_MASK(BTN_RIGHT);
+
+	if (input_register_device(priv->dev2))
+		goto init_fail;
+
+	psmouse->protocol_handler = alps_process_byte;
+	psmouse->poll = alps_poll;
+	psmouse->disconnect = alps_disconnect;
+	psmouse->reconnect = alps_reconnect;
+	psmouse->pktsize = priv->proto_version == ALPS_PROTO_V4 ? 8 : 6;
+
+	/* We are having trouble resyncing ALPS touchpads so disable it for now */
+	psmouse->resync_time = 0;
+
+	/* Allow 2 invalid packets without resetting device */
+	psmouse->resetafter = psmouse->pktsize * 2;
+
+	return 0;
+
+init_fail:
+	psmouse_reset(psmouse);
+	input_free_device(dev2);
+	kfree(priv);
+	psmouse->private = NULL;
+	return -1;
+}
+
+int alps_detect(struct psmouse *psmouse, bool set_properties)
+{
+	struct alps_data dummy;
+
+	if (alps_identify(psmouse, &dummy) < 0)
+		return -1;
+
+	if (set_properties) {
+		psmouse->vendor = "ALPS";
+		psmouse->name = dummy.flags & ALPS_DUALPOINT ?
+				"DualPoint TouchPad" : "GlidePoint";
+		psmouse->model = dummy.proto_version << 8;
+	}
+	return 0;
+}
+