Adding upstream version 6.6.15.upstream/6.6.15

Signed-off-by: Daniel Baumann <daniel.baumann@progress-linux.org>

1 files changed, 3232 insertions, 0 deletions

diff --git a/drivers/input/mouse/alps.c b/drivers/input/mouse/alps.c
new file mode 100644
index 0000000000..e2c11d9f38
--- /dev/null
+++ b/drivers/input/mouse/alps.c
@@ -0,0 +1,3232 @@
+// SPDX-License-Identifier: GPL-2.0-only
+/*
+ * 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).
+ */
+
+#include <linux/slab.h>
+#include <linux/input.h>
+#include <linux/input/mt.h>
+#include <linux/serio.h>
+#include <linux/libps2.h>
+#include <linux/dmi.h>
+
+#include "psmouse.h"
+#include "alps.h"
+#include "trackpoint.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_V7	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 */
+};
+
+static const struct alps_nibble_commands alps_v6_nibble_commands[] = {
+	{ PSMOUSE_CMD_ENABLE,		0x00 }, /* 0 */
+	{ PSMOUSE_CMD_SETRATE,		0x0a }, /* 1 */
+	{ PSMOUSE_CMD_SETRATE,		0x14 }, /* 2 */
+	{ PSMOUSE_CMD_SETRATE,		0x28 }, /* 3 */
+	{ PSMOUSE_CMD_SETRATE,		0x3c }, /* 4 */
+	{ PSMOUSE_CMD_SETRATE,		0x50 }, /* 5 */
+	{ PSMOUSE_CMD_SETRATE,		0x64 }, /* 6 */
+	{ PSMOUSE_CMD_SETRATE,		0xc8 }, /* 7 */
+	{ PSMOUSE_CMD_GETID,		0x00 }, /* 8 */
+	{ PSMOUSE_CMD_GETINFO,		0x00 }, /* 9 */
+	{ PSMOUSE_CMD_SETRES,		0x00 }, /* a */
+	{ PSMOUSE_CMD_SETRES,		0x01 }, /* b */
+	{ PSMOUSE_CMD_SETRES,		0x02 }, /* c */
+	{ PSMOUSE_CMD_SETRES,		0x03 }, /* d */
+	{ PSMOUSE_CMD_SETSCALE21,	0x00 }, /* 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 */
+#define ALPS_STICK_BITS		0x100	/* separate stick button bits */
+#define ALPS_BUTTONPAD		0x200	/* device is a clickpad */
+#define ALPS_DUALPOINT_WITH_PRESSURE	0x400	/* device can report trackpoint pressure */
+
+static const struct alps_model_info alps_model_data[] = {
+	/*
+	 * 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.
+	 */
+	{ { 0x20, 0x02, 0x0e }, { ALPS_PROTO_V2, 0xf8, 0xf8, ALPS_PASS | ALPS_DUALPOINT } },
+
+	{ { 0x22, 0x02, 0x0a }, { ALPS_PROTO_V2, 0xf8, 0xf8, ALPS_PASS | ALPS_DUALPOINT } },
+	{ { 0x22, 0x02, 0x14 }, { ALPS_PROTO_V2, 0xff, 0xff, ALPS_PASS | ALPS_DUALPOINT } },	/* Dell Latitude D600 */
+	{ { 0x32, 0x02, 0x14 }, { ALPS_PROTO_V2, 0xf8, 0xf8, ALPS_PASS | ALPS_DUALPOINT } },	/* Toshiba Salellite Pro M10 */
+	{ { 0x33, 0x02, 0x0a }, { ALPS_PROTO_V1, 0x88, 0xf8, 0 } },				/* UMAX-530T */
+	{ { 0x52, 0x01, 0x14 }, { ALPS_PROTO_V2, 0xff, 0xff,
+		ALPS_PASS | ALPS_DUALPOINT | ALPS_PS2_INTERLEAVED } },				/* Toshiba Tecra A11-11L */
+	{ { 0x53, 0x02, 0x0a }, { ALPS_PROTO_V2, 0xf8, 0xf8, 0 } },
+	{ { 0x53, 0x02, 0x14 }, { ALPS_PROTO_V2, 0xf8, 0xf8, 0 } },
+	{ { 0x60, 0x03, 0xc8 }, { ALPS_PROTO_V2, 0xf8, 0xf8, 0 } },				/* HP ze1115 */
+	{ { 0x62, 0x02, 0x14 }, { ALPS_PROTO_V2, 0xcf, 0xcf,
+		ALPS_PASS | ALPS_DUALPOINT | ALPS_PS2_INTERLEAVED } },				/* Dell Latitude E5500, E6400, E6500, Precision M4400 */
+	{ { 0x63, 0x02, 0x0a }, { ALPS_PROTO_V2, 0xf8, 0xf8, 0 } },
+	{ { 0x63, 0x02, 0x14 }, { ALPS_PROTO_V2, 0xf8, 0xf8, 0 } },
+	{ { 0x63, 0x02, 0x28 }, { ALPS_PROTO_V2, 0xf8, 0xf8, ALPS_FW_BK_2 } },			/* Fujitsu Siemens S6010 */
+	{ { 0x63, 0x02, 0x3c }, { ALPS_PROTO_V2, 0x8f, 0x8f, ALPS_WHEEL } },			/* Toshiba Satellite S2400-103 */
+	{ { 0x63, 0x02, 0x50 }, { ALPS_PROTO_V2, 0xef, 0xef, ALPS_FW_BK_1 } },			/* NEC Versa L320 */
+	{ { 0x63, 0x02, 0x64 }, { ALPS_PROTO_V2, 0xf8, 0xf8, 0 } },
+	{ { 0x63, 0x03, 0xc8 }, { ALPS_PROTO_V2, 0xf8, 0xf8, ALPS_PASS | ALPS_DUALPOINT } },	/* Dell Latitude D800 */
+	{ { 0x73, 0x00, 0x0a }, { ALPS_PROTO_V2, 0xf8, 0xf8, ALPS_DUALPOINT } },		/* ThinkPad R61 8918-5QG */
+	{ { 0x73, 0x00, 0x14 }, { ALPS_PROTO_V6, 0xff, 0xff, ALPS_DUALPOINT } },		/* Dell XT2 */
+	{ { 0x73, 0x02, 0x0a }, { ALPS_PROTO_V2, 0xf8, 0xf8, 0 } },
+	{ { 0x73, 0x02, 0x14 }, { ALPS_PROTO_V2, 0xf8, 0xf8, ALPS_FW_BK_2 } },			/* Ahtec Laptop */
+	{ { 0x73, 0x02, 0x50 }, { ALPS_PROTO_V2, 0xcf, 0xcf, ALPS_FOUR_BUTTONS } },		/* Dell Vostro 1400 */
+};
+
+static const struct alps_protocol_info alps_v3_protocol_data = {
+	ALPS_PROTO_V3, 0x8f, 0x8f, ALPS_DUALPOINT | ALPS_DUALPOINT_WITH_PRESSURE
+};
+
+static const struct alps_protocol_info alps_v3_rushmore_data = {
+	ALPS_PROTO_V3_RUSHMORE, 0x8f, 0x8f, ALPS_DUALPOINT | ALPS_DUALPOINT_WITH_PRESSURE
+};
+
+static const struct alps_protocol_info alps_v4_protocol_data = {
+	ALPS_PROTO_V4, 0x8f, 0x8f, 0
+};
+
+static const struct alps_protocol_info alps_v5_protocol_data = {
+	ALPS_PROTO_V5, 0xc8, 0xd8, 0
+};
+
+static const struct alps_protocol_info alps_v7_protocol_data = {
+	ALPS_PROTO_V7, 0x48, 0x48, ALPS_DUALPOINT | ALPS_DUALPOINT_WITH_PRESSURE
+};
+
+static const struct alps_protocol_info alps_v8_protocol_data = {
+	ALPS_PROTO_V8, 0x18, 0x18, 0
+};
+
+static const struct alps_protocol_info alps_v9_protocol_data = {
+	ALPS_PROTO_V9, 0xc8, 0xc8, 0
+};
+
+/*
+ * Some v2 models report the stick buttons in separate bits
+ */
+static const struct dmi_system_id alps_dmi_has_separate_stick_buttons[] = {
+#if defined(CONFIG_DMI) && defined(CONFIG_X86)
+	{
+		/* Extrapolated from other entries */
+		.matches = {
+			DMI_MATCH(DMI_SYS_VENDOR, "Dell Inc."),
+			DMI_MATCH(DMI_PRODUCT_NAME, "Latitude D420"),
+		},
+	},
+	{
+		/* Reported-by: Hans de Bruin <jmdebruin@xmsnet.nl> */
+		.matches = {
+			DMI_MATCH(DMI_SYS_VENDOR, "Dell Inc."),
+			DMI_MATCH(DMI_PRODUCT_NAME, "Latitude D430"),
+		},
+	},
+	{
+		/* Reported-by: Hans de Goede <hdegoede@redhat.com> */
+		.matches = {
+			DMI_MATCH(DMI_SYS_VENDOR, "Dell Inc."),
+			DMI_MATCH(DMI_PRODUCT_NAME, "Latitude D620"),
+		},
+	},
+	{
+		/* Extrapolated from other entries */
+		.matches = {
+			DMI_MATCH(DMI_SYS_VENDOR, "Dell Inc."),
+			DMI_MATCH(DMI_PRODUCT_NAME, "Latitude D630"),
+		},
+	},
+#endif
+	{ }
+};
+
+static void alps_set_abs_params_st(struct alps_data *priv,
+				   struct input_dev *dev1);
+static void alps_set_abs_params_semi_mt(struct alps_data *priv,
+					struct input_dev *dev1);
+static void alps_set_abs_params_v7(struct alps_data *priv,
+				   struct input_dev *dev1);
+static void alps_set_abs_params_ss4_v2(struct alps_data *priv,
+				       struct input_dev *dev1);
+
+/* Packet formats are described in Documentation/input/devices/alps.rst */
+
+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 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 = (dev2 && test_bit(BTN_LEFT, dev2->key)) ? dev2 : dev1;
+	input_report_key(dev, BTN_LEFT, left);
+
+	dev = (dev2 && test_bit(BTN_RIGHT, dev2->key)) ? dev2 : dev1;
+	input_report_key(dev, BTN_RIGHT, right);
+
+	dev = (dev2 && 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.
+	 */
+	if (dev2)
+		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(dev2, dev, left, right, middle);
+
+		input_sync(dev2);
+		return;
+	}
+
+	/* Some models have separate stick button bits */
+	if (priv->flags & ALPS_STICK_BITS) {
+		left |= packet[0] & 1;
+		right |= packet[0] & 2;
+		middle |= packet[0] & 4;
+	}
+
+	alps_report_buttons(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);
+}
+
+static void alps_get_bitmap_points(unsigned int map,
+				   struct alps_bitmap_point *low,
+				   struct alps_bitmap_point *high,
+				   int *fingers)
+{
+	struct alps_bitmap_point *point;
+	int i, bit, prev_bit = 0;
+
+	point = low;
+	for (i = 0; map != 0; i++, map >>= 1) {
+		bit = map & 1;
+		if (bit) {
+			if (!prev_bit) {
+				point->start_bit = i;
+				point->num_bits = 0;
+				(*fingers)++;
+			}
+			point->num_bits++;
+		} else {
+			if (prev_bit)
+				point = high;
+		}
+		prev_bit = bit;
+	}
+}
+
+/*
+ * Process bitmap data from semi-mt 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 fields->mt when the return value
+ * is greater than 0.
+ */
+static int alps_process_bitmap(struct alps_data *priv,
+			       struct alps_fields *fields)
+{
+	int i, fingers_x = 0, fingers_y = 0, fingers, closest;
+	struct alps_bitmap_point x_low = {0,}, x_high = {0,};
+	struct alps_bitmap_point y_low = {0,}, y_high = {0,};
+	struct input_mt_pos corner[4];
+
+	if (!fields->x_map || !fields->y_map)
+		return 0;
+
+	alps_get_bitmap_points(fields->x_map, &x_low, &x_high, &fingers_x);
+	alps_get_bitmap_points(fields->y_map, &y_low, &y_high, &fingers_y);
+
+	/*
+	 * 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 an axis reports only a single contact, we have overlapping or
+	 * adjacent fingers. Divide the single contact between the two points.
+	 */
+	if (fingers_x == 1) {
+		i = (x_low.num_bits - 1) / 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);
+	}
+	if (fingers_y == 1) {
+		i = (y_low.num_bits - 1) / 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);
+	}
+
+	/* top-left corner */
+	corner[0].x =
+		(priv->x_max * (2 * x_low.start_bit + x_low.num_bits - 1)) /
+		(2 * (priv->x_bits - 1));
+	corner[0].y =
+		(priv->y_max * (2 * y_low.start_bit + y_low.num_bits - 1)) /
+		(2 * (priv->y_bits - 1));
+
+	/* top-right corner */
+	corner[1].x =
+		(priv->x_max * (2 * x_high.start_bit + x_high.num_bits - 1)) /
+		(2 * (priv->x_bits - 1));
+	corner[1].y =
+		(priv->y_max * (2 * y_low.start_bit + y_low.num_bits - 1)) /
+		(2 * (priv->y_bits - 1));
+
+	/* bottom-right corner */
+	corner[2].x =
+		(priv->x_max * (2 * x_high.start_bit + x_high.num_bits - 1)) /
+		(2 * (priv->x_bits - 1));
+	corner[2].y =
+		(priv->y_max * (2 * y_high.start_bit + y_high.num_bits - 1)) /
+		(2 * (priv->y_bits - 1));
+
+	/* bottom-left corner */
+	corner[3].x =
+		(priv->x_max * (2 * x_low.start_bit + x_low.num_bits - 1)) /
+		(2 * (priv->x_bits - 1));
+	corner[3].y =
+		(priv->y_max * (2 * y_high.start_bit + y_high.num_bits - 1)) /
+		(2 * (priv->y_bits - 1));
+
+	/* x-bitmap order is reversed on v5 touchpads  */
+	if (priv->proto_version == ALPS_PROTO_V5) {
+		for (i = 0; i < 4; i++)
+			corner[i].x = priv->x_max - corner[i].x;
+	}
+
+	/* y-bitmap order is reversed on v3 and v4 touchpads  */
+	if (priv->proto_version == ALPS_PROTO_V3 ||
+	    priv->proto_version == ALPS_PROTO_V4) {
+		for (i = 0; i < 4; i++)
+			corner[i].y = priv->y_max - corner[i].y;
+	}
+
+	/*
+	 * We only select a corner for the second touch once per 2 finger
+	 * touch sequence to avoid the chosen corner (and thus the coordinates)
+	 * jumping around when the first touch is in the middle.
+	 */
+	if (priv->second_touch == -1) {
+		/* Find corner closest to our st coordinates */
+		closest = 0x7fffffff;
+		for (i = 0; i < 4; i++) {
+			int dx = fields->st.x - corner[i].x;
+			int dy = fields->st.y - corner[i].y;
+			int distance = dx * dx + dy * dy;
+
+			if (distance < closest) {
+				priv->second_touch = i;
+				closest = distance;
+			}
+		}
+		/* And select the opposite corner to use for the 2nd touch */
+		priv->second_touch = (priv->second_touch + 2) % 4;
+	}
+
+	fields->mt[0] = fields->st;
+	fields->mt[1] = corner[priv->second_touch];
+
+	return fingers;
+}
+
+static void alps_set_slot(struct input_dev *dev, int slot, int x, int y)
+{
+	input_mt_slot(dev, slot);
+	input_mt_report_slot_state(dev, MT_TOOL_FINGER, true);
+	input_report_abs(dev, ABS_MT_POSITION_X, x);
+	input_report_abs(dev, ABS_MT_POSITION_Y, y);
+}
+
+static void alps_report_mt_data(struct psmouse *psmouse, int n)
+{
+	struct alps_data *priv = psmouse->private;
+	struct input_dev *dev = psmouse->dev;
+	struct alps_fields *f = &priv->f;
+	int i, slot[MAX_TOUCHES];
+
+	input_mt_assign_slots(dev, slot, f->mt, n, 0);
+	for (i = 0; i < n; i++)
+		alps_set_slot(dev, slot[i], f->mt[i].x, f->mt[i].y);
+
+	input_mt_sync_frame(dev);
+}
+
+static void alps_report_semi_mt_data(struct psmouse *psmouse, int fingers)
+{
+	struct alps_data *priv = psmouse->private;
+	struct input_dev *dev = psmouse->dev;
+	struct alps_fields *f = &priv->f;
+
+	/* Use st data when we don't have mt data */
+	if (fingers < 2) {
+		f->mt[0].x = f->st.x;
+		f->mt[0].y = f->st.y;
+		fingers = f->pressure > 0 ? 1 : 0;
+		priv->second_touch = -1;
+	}
+
+	if (fingers >= 1)
+		alps_set_slot(dev, 0, f->mt[0].x, f->mt[0].y);
+	if (fingers >= 2)
+		alps_set_slot(dev, 1, f->mt[1].x, f->mt[1].y);
+	input_mt_sync_frame(dev);
+
+	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);
+
+	input_report_abs(dev, ABS_PRESSURE, f->pressure);
+
+	input_sync(dev);
+}
+
+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;
+
+	/* It should be a DualPoint when received trackstick packet */
+	if (!(priv->flags & ALPS_DUALPOINT)) {
+		psmouse_warn(psmouse,
+			     "Rejected trackstick packet from non DualPoint device");
+		return;
+	}
+
+	/* 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] & 0x7f;
+
+	/*
+	 * 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);
+	input_report_abs(dev, ABS_PRESSURE, z);
+
+	/*
+	 * 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 int alps_decode_pinnacle(struct alps_fields *f, unsigned char *p,
+				 struct psmouse *psmouse)
+{
+	f->first_mp = !!(p[4] & 0x40);
+	f->is_mp = !!(p[0] & 0x40);
+
+	if (f->is_mp) {
+		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);
+	} else {
+		f->st.x = ((p[1] & 0x7f) << 4) | ((p[4] & 0x30) >> 2) |
+		       ((p[0] & 0x30) >> 4);
+		f->st.y = ((p[2] & 0x7f) << 4) | (p[4] & 0x0f);
+		f->pressure = p[5] & 0x7f;
+
+		alps_decode_buttons_v3(f, p);
+	}
+
+	return 0;
+}
+
+static int alps_decode_rushmore(struct alps_fields *f, unsigned char *p,
+				 struct psmouse *psmouse)
+{
+	f->first_mp = !!(p[4] & 0x40);
+	f->is_mp = !!(p[5] & 0x40);
+
+	if (f->is_mp) {
+		f->fingers = max((p[5] & 0x3), ((p[5] >> 2) & 0x3)) + 1;
+		f->x_map = ((p[5] & 0x10) << 11) |
+			   ((p[4] & 0x7e) << 8) |
+			   ((p[1] & 0x7f) << 2) |
+			   ((p[0] & 0x30) >> 4);
+		f->y_map = ((p[5] & 0x20) << 6) |
+			   ((p[3] & 0x70) << 4) |
+			   ((p[2] & 0x7f) << 1) |
+			   (p[4] & 0x01);
+	} else {
+		f->st.x = ((p[1] & 0x7f) << 4) | ((p[4] & 0x30) >> 2) |
+		       ((p[0] & 0x30) >> 4);
+		f->st.y = ((p[2] & 0x7f) << 4) | (p[4] & 0x0f);
+		f->pressure = p[5] & 0x7f;
+
+		alps_decode_buttons_v3(f, p);
+	}
+
+	return 0;
+}
+
+static int alps_decode_dolphin(struct alps_fields *f, unsigned char *p,
+				struct psmouse *psmouse)
+{
+	u64 palm_data = 0;
+	struct alps_data *priv = psmouse->private;
+
+	f->first_mp = !!(p[0] & 0x02);
+	f->is_mp = !!(p[0] & 0x20);
+
+	if (!f->is_mp) {
+		f->st.x = ((p[1] & 0x7f) | ((p[4] & 0x0f) << 7));
+		f->st.y = ((p[2] & 0x7f) | ((p[4] & 0xf0) << 3));
+		f->pressure = (p[0] & 4) ? 0 : p[5] & 0x7f;
+		alps_decode_buttons_v3(f, p);
+	} else {
+		f->fingers = ((p[0] & 0x6) >> 1 |
+		     (p[0] & 0x10) >> 2);
+
+		palm_data = (p[1] & 0x7f) |
+			    ((p[2] & 0x7f) << 7) |
+			    ((p[4] & 0x7f) << 14) |
+			    ((p[5] & 0x7f) << 21) |
+			    ((p[3] & 0x07) << 28) |
+			    (((u64)p[3] & 0x70) << 27) |
+			    (((u64)p[0] & 0x01) << 34);
+
+		/* Y-profile is stored in P(0) to p(n-1), n = y_bits; */
+		f->y_map = palm_data & (BIT(priv->y_bits) - 1);
+
+		/* X-profile is stored in p(n) to p(n+m-1), m = x_bits; */
+		f->x_map = (palm_data >> priv->y_bits) &
+			   (BIT(priv->x_bits) - 1);
+	}
+
+	return 0;
+}
+
+static void alps_process_touchpad_packet_v3_v5(struct psmouse *psmouse)
+{
+	struct alps_data *priv = psmouse->private;
+	unsigned char *packet = psmouse->packet;
+	struct input_dev *dev2 = priv->dev2;
+	struct alps_fields *f = &priv->f;
+	int fingers = 0;
+
+	memset(f, 0, sizeof(*f));
+
+	priv->decode_fields(f, packet, psmouse);
+
+	/*
+	 * 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;
+			/*
+			 * Bitmap processing uses position packet's coordinate
+			 * data, so we need to do decode it first.
+			 */
+			priv->decode_fields(f, priv->multi_data, psmouse);
+			if (alps_process_bitmap(priv, f) == 0)
+				fingers = 0; /* Use st 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->st.x && f->st.y && !f->pressure)
+		return;
+
+	alps_report_semi_mt_data(psmouse, fingers);
+
+	if ((priv->flags & ALPS_DUALPOINT) &&
+	    !(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_v5(psmouse);
+}
+
+static void alps_process_packet_v6(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;
+
+	/*
+	 * We can use Byte5 to distinguish if the packet is from Touchpad
+	 * or Trackpoint.
+	 * Touchpad:	0 - 0x7E
+	 * Trackpoint:	0x7F
+	 */
+	if (packet[5] == 0x7F) {
+		/* It should be a DualPoint when received Trackpoint packet */
+		if (!(priv->flags & ALPS_DUALPOINT)) {
+			psmouse_warn(psmouse,
+				     "Rejected trackstick packet from non DualPoint device");
+			return;
+		}
+
+		/* Trackpoint packet */
+		x = packet[1] | ((packet[3] & 0x20) << 2);
+		y = packet[2] | ((packet[3] & 0x40) << 1);
+		z = packet[4];
+
+		/* To prevent the cursor jump when finger lifted */
+		if (x == 0x7F && y == 0x7F && z == 0x7F)
+			x = y = z = 0;
+
+		/* Divide 4 since trackpoint's speed is too fast */
+		input_report_rel(dev2, REL_X, (s8)x / 4);
+		input_report_rel(dev2, REL_Y, -((s8)y / 4));
+
+		psmouse_report_standard_buttons(dev2, packet[3]);
+
+		input_sync(dev2);
+		return;
+	}
+
+	/* Touchpad packet */
+	x = packet[1] | ((packet[3] & 0x78) << 4);
+	y = packet[2] | ((packet[4] & 0x78) << 4);
+	z = packet[5];
+
+	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);
+
+	/* v6 touchpad does not have middle button */
+	packet[3] &= ~BIT(2);
+	psmouse_report_standard_buttons(dev2, packet[3]);
+
+	input_sync(dev);
+}
+
+static void alps_process_packet_v4(struct psmouse *psmouse)
+{
+	struct alps_data *priv = psmouse->private;
+	unsigned char *packet = psmouse->packet;
+	struct alps_fields *f = &priv->f;
+	int offset;
+
+	/*
+	 * 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];
+
+	f->left = !!(packet[4] & 0x01);
+	f->right = !!(packet[4] & 0x02);
+
+	f->st.x = ((packet[1] & 0x7f) << 4) | ((packet[3] & 0x30) >> 2) |
+		  ((packet[0] & 0x30) >> 4);
+	f->st.y = ((packet[2] & 0x7f) << 4) | (packet[3] & 0x0f);
+	f->pressure = packet[5] & 0x7f;
+
+	if (++priv->multi_packet > 2) {
+		priv->multi_packet = 0;
+
+		f->x_map = ((priv->multi_data[2] & 0x1f) << 10) |
+			   ((priv->multi_data[3] & 0x60) << 3) |
+			   ((priv->multi_data[0] & 0x3f) << 2) |
+			   ((priv->multi_data[1] & 0x60) >> 5);
+		f->y_map = ((priv->multi_data[5] & 0x01) << 10) |
+			   ((priv->multi_data[3] & 0x1f) << 5) |
+			    (priv->multi_data[1] & 0x1f);
+
+		f->fingers = alps_process_bitmap(priv, f);
+	}
+
+	alps_report_semi_mt_data(psmouse, f->fingers);
+}
+
+static bool alps_is_valid_package_v7(struct psmouse *psmouse)
+{
+	switch (psmouse->pktcnt) {
+	case 3:
+		return (psmouse->packet[2] & 0x40) == 0x40;
+	case 4:
+		return (psmouse->packet[3] & 0x48) == 0x48;
+	case 6:
+		return (psmouse->packet[5] & 0x40) == 0x00;
+	}
+	return true;
+}
+
+static unsigned char alps_get_packet_id_v7(char *byte)
+{
+	unsigned char packet_id;
+
+	if (byte[4] & 0x40)
+		packet_id = V7_PACKET_ID_TWO;
+	else if (byte[4] & 0x01)
+		packet_id = V7_PACKET_ID_MULTI;
+	else if ((byte[0] & 0x10) && !(byte[4] & 0x43))
+		packet_id = V7_PACKET_ID_NEW;
+	else if (byte[1] == 0x00 && byte[4] == 0x00)
+		packet_id = V7_PACKET_ID_IDLE;
+	else
+		packet_id = V7_PACKET_ID_UNKNOWN;
+
+	return packet_id;
+}
+
+static void alps_get_finger_coordinate_v7(struct input_mt_pos *mt,
+					  unsigned char *pkt,
+					  unsigned char pkt_id)
+{
+	mt[0].x = ((pkt[2] & 0x80) << 4);
+	mt[0].x |= ((pkt[2] & 0x3F) << 5);
+	mt[0].x |= ((pkt[3] & 0x30) >> 1);
+	mt[0].x |= (pkt[3] & 0x07);
+	mt[0].y = (pkt[1] << 3) | (pkt[0] & 0x07);
+
+	mt[1].x = ((pkt[3] & 0x80) << 4);
+	mt[1].x |= ((pkt[4] & 0x80) << 3);
+	mt[1].x |= ((pkt[4] & 0x3F) << 4);
+	mt[1].y = ((pkt[5] & 0x80) << 3);
+	mt[1].y |= ((pkt[5] & 0x3F) << 4);
+
+	switch (pkt_id) {
+	case V7_PACKET_ID_TWO:
+		mt[1].x &= ~0x000F;
+		mt[1].y |= 0x000F;
+		/* Detect false-positive touches where x & y report max value */
+		if (mt[1].y == 0x7ff && mt[1].x == 0xff0) {
+			mt[1].x = 0;
+			/* y gets set to 0 at the end of this function */
+		}
+		break;
+
+	case V7_PACKET_ID_MULTI:
+		mt[1].x &= ~0x003F;
+		mt[1].y &= ~0x0020;
+		mt[1].y |= ((pkt[4] & 0x02) << 4);
+		mt[1].y |= 0x001F;
+		break;
+
+	case V7_PACKET_ID_NEW:
+		mt[1].x &= ~0x003F;
+		mt[1].x |= (pkt[0] & 0x20);
+		mt[1].y |= 0x000F;
+		break;
+	}
+
+	mt[0].y = 0x7FF - mt[0].y;
+	mt[1].y = 0x7FF - mt[1].y;
+}
+
+static int alps_get_mt_count(struct input_mt_pos *mt)
+{
+	int i, fingers = 0;
+
+	for (i = 0; i < MAX_TOUCHES; i++) {
+		if (mt[i].x != 0 || mt[i].y != 0)
+			fingers++;
+	}
+
+	return fingers;
+}
+
+static int alps_decode_packet_v7(struct alps_fields *f,
+				  unsigned char *p,
+				  struct psmouse *psmouse)
+{
+	struct alps_data *priv = psmouse->private;
+	unsigned char pkt_id;
+
+	pkt_id = alps_get_packet_id_v7(p);
+	if (pkt_id == V7_PACKET_ID_IDLE)
+		return 0;
+	if (pkt_id == V7_PACKET_ID_UNKNOWN)
+		return -1;
+	/*
+	 * NEW packets are send to indicate a discontinuity in the finger
+	 * coordinate reporting. Specifically a finger may have moved from
+	 * slot 0 to 1 or vice versa. INPUT_MT_TRACK takes care of this for
+	 * us.
+	 *
+	 * NEW packets have 3 problems:
+	 * 1) They do not contain middle / right button info (on non clickpads)
+	 *    this can be worked around by preserving the old button state
+	 * 2) They do not contain an accurate fingercount, and they are
+	 *    typically send when the number of fingers changes. We cannot use
+	 *    the old finger count as that may mismatch with the amount of
+	 *    touch coordinates we've available in the NEW packet
+	 * 3) Their x data for the second touch is inaccurate leading to
+	 *    a possible jump of the x coordinate by 16 units when the first
+	 *    non NEW packet comes in
+	 * Since problems 2 & 3 cannot be worked around, just ignore them.
+	 */
+	if (pkt_id == V7_PACKET_ID_NEW)
+		return 1;
+
+	alps_get_finger_coordinate_v7(f->mt, p, pkt_id);
+
+	if (pkt_id == V7_PACKET_ID_TWO)
+		f->fingers = alps_get_mt_count(f->mt);
+	else /* pkt_id == V7_PACKET_ID_MULTI */
+		f->fingers = 3 + (p[5] & 0x03);
+
+	f->left = (p[0] & 0x80) >> 7;
+	if (priv->flags & ALPS_BUTTONPAD) {
+		if (p[0] & 0x20)
+			f->fingers++;
+		if (p[0] & 0x10)
+			f->fingers++;
+	} else {
+		f->right = (p[0] & 0x20) >> 5;
+		f->middle = (p[0] & 0x10) >> 4;
+	}
+
+	/* Sometimes a single touch is reported in mt[1] rather then mt[0] */
+	if (f->fingers == 1 && f->mt[0].x == 0 && f->mt[0].y == 0) {
+		f->mt[0].x = f->mt[1].x;
+		f->mt[0].y = f->mt[1].y;
+		f->mt[1].x = 0;
+		f->mt[1].y = 0;
+	}
+
+	return 0;
+}
+
+static void alps_process_trackstick_packet_v7(struct psmouse *psmouse)
+{
+	struct alps_data *priv = psmouse->private;
+	unsigned char *packet = psmouse->packet;
+	struct input_dev *dev2 = priv->dev2;
+	int x, y, z;
+
+	/* It should be a DualPoint when received trackstick packet */
+	if (!(priv->flags & ALPS_DUALPOINT)) {
+		psmouse_warn(psmouse,
+			     "Rejected trackstick packet from non DualPoint device");
+		return;
+	}
+
+	x = ((packet[2] & 0xbf)) | ((packet[3] & 0x10) << 2);
+	y = (packet[3] & 0x07) | (packet[4] & 0xb8) |
+	    ((packet[3] & 0x20) << 1);
+	z = (packet[5] & 0x3f) | ((packet[3] & 0x80) >> 1);
+
+	input_report_rel(dev2, REL_X, (s8)x);
+	input_report_rel(dev2, REL_Y, -((s8)y));
+	input_report_abs(dev2, ABS_PRESSURE, z);
+
+	psmouse_report_standard_buttons(dev2, packet[1]);
+
+	input_sync(dev2);
+}
+
+static void alps_process_touchpad_packet_v7(struct psmouse *psmouse)
+{
+	struct alps_data *priv = psmouse->private;
+	struct input_dev *dev = psmouse->dev;
+	struct alps_fields *f = &priv->f;
+
+	memset(f, 0, sizeof(*f));
+
+	if (priv->decode_fields(f, psmouse->packet, psmouse))
+		return;
+
+	alps_report_mt_data(psmouse, alps_get_mt_count(f->mt));
+
+	input_mt_report_finger_count(dev, f->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);
+
+	input_sync(dev);
+}
+
+static void alps_process_packet_v7(struct psmouse *psmouse)
+{
+	unsigned char *packet = psmouse->packet;
+
+	if (packet[0] == 0x48 && (packet[4] & 0x47) == 0x06)
+		alps_process_trackstick_packet_v7(psmouse);
+	else
+		alps_process_touchpad_packet_v7(psmouse);
+}
+
+static enum SS4_PACKET_ID alps_get_pkt_id_ss4_v2(unsigned char *byte)
+{
+	enum SS4_PACKET_ID pkt_id = SS4_PACKET_ID_IDLE;
+
+	switch (byte[3] & 0x30) {
+	case 0x00:
+		if (SS4_IS_IDLE_V2(byte)) {
+			pkt_id = SS4_PACKET_ID_IDLE;
+		} else {
+			pkt_id = SS4_PACKET_ID_ONE;
+		}
+		break;
+	case 0x10:
+		/* two-finger finger positions */
+		pkt_id = SS4_PACKET_ID_TWO;
+		break;
+	case 0x20:
+		/* stick pointer */
+		pkt_id = SS4_PACKET_ID_STICK;
+		break;
+	case 0x30:
+		/* third and fourth finger positions */
+		pkt_id = SS4_PACKET_ID_MULTI;
+		break;
+	}
+
+	return pkt_id;
+}
+
+static int alps_decode_ss4_v2(struct alps_fields *f,
+			      unsigned char *p, struct psmouse *psmouse)
+{
+	struct alps_data *priv = psmouse->private;
+	enum SS4_PACKET_ID pkt_id;
+	unsigned int no_data_x, no_data_y;
+
+	pkt_id = alps_get_pkt_id_ss4_v2(p);
+
+	/* Current packet is 1Finger coordinate packet */
+	switch (pkt_id) {
+	case SS4_PACKET_ID_ONE:
+		f->mt[0].x = SS4_1F_X_V2(p);
+		f->mt[0].y = SS4_1F_Y_V2(p);
+		f->pressure = ((SS4_1F_Z_V2(p)) * 2) & 0x7f;
+		/*
+		 * When a button is held the device will give us events
+		 * with x, y, and pressure of 0. This causes annoying jumps
+		 * if a touch is released while the button is held.
+		 * Handle this by claiming zero contacts.
+		 */
+		f->fingers = f->pressure > 0 ? 1 : 0;
+		f->first_mp = 0;
+		f->is_mp = 0;
+		break;
+
+	case SS4_PACKET_ID_TWO:
+		if (priv->flags & ALPS_BUTTONPAD) {
+			if (IS_SS4PLUS_DEV(priv->dev_id)) {
+				f->mt[0].x = SS4_PLUS_BTL_MF_X_V2(p, 0);
+				f->mt[1].x = SS4_PLUS_BTL_MF_X_V2(p, 1);
+			} else {
+				f->mt[0].x = SS4_BTL_MF_X_V2(p, 0);
+				f->mt[1].x = SS4_BTL_MF_X_V2(p, 1);
+			}
+			f->mt[0].y = SS4_BTL_MF_Y_V2(p, 0);
+			f->mt[1].y = SS4_BTL_MF_Y_V2(p, 1);
+		} else {
+			if (IS_SS4PLUS_DEV(priv->dev_id)) {
+				f->mt[0].x = SS4_PLUS_STD_MF_X_V2(p, 0);
+				f->mt[1].x = SS4_PLUS_STD_MF_X_V2(p, 1);
+			} else {
+				f->mt[0].x = SS4_STD_MF_X_V2(p, 0);
+				f->mt[1].x = SS4_STD_MF_X_V2(p, 1);
+			}
+			f->mt[0].y = SS4_STD_MF_Y_V2(p, 0);
+			f->mt[1].y = SS4_STD_MF_Y_V2(p, 1);
+		}
+		f->pressure = SS4_MF_Z_V2(p, 0) ? 0x30 : 0;
+
+		if (SS4_IS_MF_CONTINUE(p)) {
+			f->first_mp = 1;
+		} else {
+			f->fingers = 2;
+			f->first_mp = 0;
+		}
+		f->is_mp = 0;
+
+		break;
+
+	case SS4_PACKET_ID_MULTI:
+		if (priv->flags & ALPS_BUTTONPAD) {
+			if (IS_SS4PLUS_DEV(priv->dev_id)) {
+				f->mt[2].x = SS4_PLUS_BTL_MF_X_V2(p, 0);
+				f->mt[3].x = SS4_PLUS_BTL_MF_X_V2(p, 1);
+				no_data_x = SS4_PLUS_MFPACKET_NO_AX_BL;
+			} else {
+				f->mt[2].x = SS4_BTL_MF_X_V2(p, 0);
+				f->mt[3].x = SS4_BTL_MF_X_V2(p, 1);
+				no_data_x = SS4_MFPACKET_NO_AX_BL;
+			}
+			no_data_y = SS4_MFPACKET_NO_AY_BL;
+
+			f->mt[2].y = SS4_BTL_MF_Y_V2(p, 0);
+			f->mt[3].y = SS4_BTL_MF_Y_V2(p, 1);
+		} else {
+			if (IS_SS4PLUS_DEV(priv->dev_id)) {
+				f->mt[2].x = SS4_PLUS_STD_MF_X_V2(p, 0);
+				f->mt[3].x = SS4_PLUS_STD_MF_X_V2(p, 1);
+				no_data_x = SS4_PLUS_MFPACKET_NO_AX;
+			} else {
+				f->mt[2].x = SS4_STD_MF_X_V2(p, 0);
+				f->mt[3].x = SS4_STD_MF_X_V2(p, 1);
+				no_data_x = SS4_MFPACKET_NO_AX;
+			}
+			no_data_y = SS4_MFPACKET_NO_AY;
+
+			f->mt[2].y = SS4_STD_MF_Y_V2(p, 0);
+			f->mt[3].y = SS4_STD_MF_Y_V2(p, 1);
+		}
+
+		f->first_mp = 0;
+		f->is_mp = 1;
+
+		if (SS4_IS_5F_DETECTED(p)) {
+			f->fingers = 5;
+		} else if (f->mt[3].x == no_data_x &&
+			     f->mt[3].y == no_data_y) {
+			f->mt[3].x = 0;
+			f->mt[3].y = 0;
+			f->fingers = 3;
+		} else {
+			f->fingers = 4;
+		}
+		break;
+
+	case SS4_PACKET_ID_STICK:
+		/*
+		 * x, y, and pressure are decoded in
+		 * alps_process_packet_ss4_v2()
+		 */
+		f->first_mp = 0;
+		f->is_mp = 0;
+		break;
+
+	case SS4_PACKET_ID_IDLE:
+	default:
+		memset(f, 0, sizeof(struct alps_fields));
+		break;
+	}
+
+	/* handle buttons */
+	if (pkt_id == SS4_PACKET_ID_STICK) {
+		f->ts_left = !!(SS4_BTN_V2(p) & 0x01);
+		f->ts_right = !!(SS4_BTN_V2(p) & 0x02);
+		f->ts_middle = !!(SS4_BTN_V2(p) & 0x04);
+	} else {
+		f->left = !!(SS4_BTN_V2(p) & 0x01);
+		if (!(priv->flags & ALPS_BUTTONPAD)) {
+			f->right = !!(SS4_BTN_V2(p) & 0x02);
+			f->middle = !!(SS4_BTN_V2(p) & 0x04);
+		}
+	}
+
+	return 0;
+}
+
+static void alps_process_packet_ss4_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;
+	struct alps_fields *f = &priv->f;
+
+	memset(f, 0, sizeof(struct alps_fields));
+	priv->decode_fields(f, packet, psmouse);
+	if (priv->multi_packet) {
+		/*
+		 * Sometimes the first packet will indicate a multi-packet
+		 * sequence, but sometimes the next multi-packet would not
+		 * come. Check for this, and when it happens process the
+		 * position packet as usual.
+		 */
+		if (f->is_mp) {
+			/* Now process the 1st packet */
+			priv->decode_fields(f, priv->multi_data, psmouse);
+		} else {
+			priv->multi_packet = 0;
+		}
+	}
+
+	/*
+	 * "f.is_mp" would always be '0' after merging the 1st and 2nd packet.
+	 * When it is set, it means 2nd packet comes without 1st packet come.
+	 */
+	if (f->is_mp)
+		return;
+
+	/* Save the first packet */
+	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;
+
+	/* Report trackstick */
+	if (alps_get_pkt_id_ss4_v2(packet) == SS4_PACKET_ID_STICK) {
+		if (!(priv->flags & ALPS_DUALPOINT)) {
+			psmouse_warn(psmouse,
+				     "Rejected trackstick packet from non DualPoint device");
+			return;
+		}
+
+		input_report_rel(dev2, REL_X, SS4_TS_X_V2(packet));
+		input_report_rel(dev2, REL_Y, SS4_TS_Y_V2(packet));
+		input_report_abs(dev2, ABS_PRESSURE, SS4_TS_Z_V2(packet));
+
+		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);
+		return;
+	}
+
+	/* Report touchpad */
+	alps_report_mt_data(psmouse, (f->fingers <= 4) ? f->fingers : 4);
+
+	input_mt_report_finger_count(dev, f->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);
+
+	input_report_abs(dev, ABS_PRESSURE, f->pressure);
+	input_sync(dev);
+}
+
+static bool alps_is_valid_package_ss4_v2(struct psmouse *psmouse)
+{
+	if (psmouse->pktcnt == 4 && ((psmouse->packet[3] & 0x08) != 0x08))
+		return false;
+	if (psmouse->pktcnt == 6 && ((psmouse->packet[5] & 0x10) != 0x0))
+		return false;
+	return true;
+}
+
+static DEFINE_MUTEX(alps_mutex);
+
+static void alps_register_bare_ps2_mouse(struct work_struct *work)
+{
+	struct alps_data *priv =
+		container_of(work, struct alps_data, dev3_register_work.work);
+	struct psmouse *psmouse = priv->psmouse;
+	struct input_dev *dev3;
+	int error = 0;
+
+	mutex_lock(&alps_mutex);
+
+	if (priv->dev3)
+		goto out;
+
+	dev3 = input_allocate_device();
+	if (!dev3) {
+		psmouse_err(psmouse, "failed to allocate secondary device\n");
+		error = -ENOMEM;
+		goto out;
+	}
+
+	snprintf(priv->phys3, sizeof(priv->phys3), "%s/%s",
+		 psmouse->ps2dev.serio->phys,
+		 (priv->dev2 ? "input2" : "input1"));
+	dev3->phys = priv->phys3;
+
+	/*
+	 * format of input device name is: "protocol vendor name"
+	 * see function psmouse_switch_protocol() in psmouse-base.c
+	 */
+	dev3->name = "PS/2 ALPS Mouse";
+
+	dev3->id.bustype = BUS_I8042;
+	dev3->id.vendor  = 0x0002;
+	dev3->id.product = PSMOUSE_PS2;
+	dev3->id.version = 0x0000;
+	dev3->dev.parent = &psmouse->ps2dev.serio->dev;
+
+	input_set_capability(dev3, EV_REL, REL_X);
+	input_set_capability(dev3, EV_REL, REL_Y);
+	input_set_capability(dev3, EV_KEY, BTN_LEFT);
+	input_set_capability(dev3, EV_KEY, BTN_RIGHT);
+	input_set_capability(dev3, EV_KEY, BTN_MIDDLE);
+
+	__set_bit(INPUT_PROP_POINTER, dev3->propbit);
+
+	error = input_register_device(dev3);
+	if (error) {
+		psmouse_err(psmouse,
+			    "failed to register secondary device: %d\n",
+			    error);
+		input_free_device(dev3);
+		goto out;
+	}
+
+	priv->dev3 = dev3;
+
+out:
+	/*
+	 * Save the error code so that we can detect that we
+	 * already tried to create the device.
+	 */
+	if (error)
+		priv->dev3 = ERR_PTR(error);
+
+	mutex_unlock(&alps_mutex);
+}
+
+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 *dev, *dev2 = NULL;
+
+	/* Figure out which device to use to report the bare packet */
+	if (priv->proto_version == ALPS_PROTO_V2 &&
+	    (priv->flags & ALPS_DUALPOINT)) {
+		/* On V2 devices the DualPoint Stick reports bare packets */
+		dev = priv->dev2;
+		dev2 = psmouse->dev;
+	} else if (unlikely(IS_ERR_OR_NULL(priv->dev3))) {
+		/* Register dev3 mouse if we received PS/2 packet first time */
+		if (!IS_ERR(priv->dev3))
+			psmouse_queue_work(psmouse, &priv->dev3_register_work,
+					   0);
+		return;
+	} else {
+		dev = priv->dev3;
+	}
+
+	if (report_buttons)
+		alps_report_buttons(dev, dev2,
+				packet[0] & 1, packet[0] & 2, packet[0] & 4);
+
+	psmouse_report_standard_motion(dev, packet);
+
+	input_sync(dev);
+}
+
+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(struct timer_list *t)
+{
+	struct alps_data *priv = from_timer(priv, t, timer);
+	struct psmouse *psmouse = priv->psmouse;
+
+	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.
+	 * Can not distinguish V8's first byte from PS/2 packet's
+	 */
+	if (priv->proto_version != ALPS_PROTO_V8 &&
+	    !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]);
+
+		if (priv->proto_version == ALPS_PROTO_V3_RUSHMORE &&
+		    psmouse->pktcnt == psmouse->pktsize) {
+			/*
+			 * Some Dell boxes, such as Latitude E6440 or E7440
+			 * with closed lid, quite often smash last byte of
+			 * otherwise valid packet with 0xff. Given that the
+			 * next packet is very likely to be valid let's
+			 * report PSMOUSE_FULL_PACKET but not process data,
+			 * rather than reporting PSMOUSE_BAD_DATA and
+			 * filling the logs.
+			 */
+			return PSMOUSE_FULL_PACKET;
+		}
+
+		return PSMOUSE_BAD_DATA;
+	}
+
+	if ((priv->proto_version == ALPS_PROTO_V7 &&
+			!alps_is_valid_package_v7(psmouse)) ||
+	    (priv->proto_version == ALPS_PROTO_V8 &&
+			!alps_is_valid_package_ss4_v2(psmouse))) {
+		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 bool alps_check_valid_firmware_id(unsigned char id[])
+{
+	if (id[0] == 0x73)
+		return true;
+
+	if (id[0] == 0x88 &&
+	    (id[1] == 0x07 ||
+	     id[1] == 0x08 ||
+	     (id[1] & 0xf0) == 0xb0 ||
+	     (id[1] & 0xf0) == 0xc0)) {
+		return true;
+	}
+
+	return false;
+}
+
+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 (!alps_check_valid_firmware_id(param)) {
+		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(ps2dev, NULL, PSMOUSE_CMD_SETPOLL);
+}
+
+static int alps_monitor_mode_send_word(struct psmouse *psmouse, u16 word)
+{
+	int i, nibble;
+
+	/*
+	 * b0-b11 are valid bits, send sequence is inverse.
+	 * e.g. when word = 0x0123, nibble send sequence is 3, 2, 1
+	 */
+	for (i = 0; i <= 8; i += 4) {
+		nibble = (word >> i) & 0xf;
+		if (alps_command_mode_send_nibble(psmouse, nibble))
+			return -1;
+	}
+
+	return 0;
+}
+
+static int alps_monitor_mode_write_reg(struct psmouse *psmouse,
+				       u16 addr, u16 value)
+{
+	struct ps2dev *ps2dev = &psmouse->ps2dev;
+
+	/* 0x0A0 is the command to write the word */
+	if (ps2_command(ps2dev, NULL, PSMOUSE_CMD_ENABLE) ||
+	    alps_monitor_mode_send_word(psmouse, 0x0A0) ||
+	    alps_monitor_mode_send_word(psmouse, addr) ||
+	    alps_monitor_mode_send_word(psmouse, value) ||
+	    ps2_command(ps2dev, NULL, PSMOUSE_CMD_DISABLE))
+		return -1;
+
+	return 0;
+}
+
+static int alps_monitor_mode(struct psmouse *psmouse, bool enable)
+{
+	struct ps2dev *ps2dev = &psmouse->ps2dev;
+
+	if (enable) {
+		/* EC E9 F5 F5 E7 E6 E7 E9 to enter monitor mode */
+		if (ps2_command(ps2dev, NULL, PSMOUSE_CMD_RESET_WRAP) ||
+		    ps2_command(ps2dev, NULL, PSMOUSE_CMD_GETINFO) ||
+		    ps2_command(ps2dev, NULL, PSMOUSE_CMD_DISABLE) ||
+		    ps2_command(ps2dev, NULL, PSMOUSE_CMD_DISABLE) ||
+		    ps2_command(ps2dev, NULL, PSMOUSE_CMD_SETSCALE21) ||
+		    ps2_command(ps2dev, NULL, PSMOUSE_CMD_SETSCALE11) ||
+		    ps2_command(ps2dev, NULL, PSMOUSE_CMD_SETSCALE21) ||
+		    ps2_command(ps2dev, NULL, PSMOUSE_CMD_GETINFO))
+			return -1;
+	} else {
+		/* EC to exit monitor mode */
+		if (ps2_command(ps2dev, NULL, PSMOUSE_CMD_RESET_WRAP))
+			return -1;
+	}
+
+	return 0;
+}
+
+static int alps_absolute_mode_v6(struct psmouse *psmouse)
+{
+	u16 reg_val = 0x181;
+	int ret;
+
+	/* enter monitor mode, to write the register */
+	if (alps_monitor_mode(psmouse, true))
+		return -1;
+
+	ret = alps_monitor_mode_write_reg(psmouse, 0x000, reg_val);
+
+	if (alps_monitor_mode(psmouse, false))
+		ret = -1;
+
+	return ret;
+}
+
+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;
+}
+
+/* Must be in passthrough mode when calling this function */
+static int alps_trackstick_enter_extended_mode_v3_v6(struct psmouse *psmouse)
+{
+	unsigned char param[2] = {0xC8, 0x14};
+
+	if (ps2_command(&psmouse->ps2dev, NULL, PSMOUSE_CMD_SETSCALE11) ||
+	    ps2_command(&psmouse->ps2dev, NULL, PSMOUSE_CMD_SETSCALE11) ||
+	    ps2_command(&psmouse->ps2dev, NULL, PSMOUSE_CMD_SETSCALE11) ||
+	    ps2_command(&psmouse->ps2dev, &param[0], PSMOUSE_CMD_SETRATE) ||
+	    ps2_command(&psmouse->ps2dev, &param[1], PSMOUSE_CMD_SETRATE))
+		return -1;
+
+	return 0;
+}
+
+static int alps_hw_init_v6(struct psmouse *psmouse)
+{
+	int ret;
+
+	/* Enter passthrough mode to let trackpoint enter 6byte raw mode */
+	if (alps_passthrough_mode_v2(psmouse, true))
+		return -1;
+
+	ret = alps_trackstick_enter_extended_mode_v3_v6(psmouse);
+
+	if (alps_passthrough_mode_v2(psmouse, false))
+		return -1;
+
+	if (ret)
+		return ret;
+
+	if (alps_absolute_mode_v6(psmouse)) {
+		psmouse_err(psmouse, "Failed to enable absolute 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_v7(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)
+{
+	int ret = 0;
+	int reg_val;
+	unsigned char param[4];
+
+	/*
+	 * We need to configure trackstick to report data for touchpad in
+	 * extended format. And also we need to tell touchpad to expect data
+	 * from trackstick in extended format. Without this configuration
+	 * trackstick packets sent from touchpad are in basic format which is
+	 * different from what we expect.
+	 */
+
+	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, "Failed to initialize trackstick (E7 report failed)\n");
+		ret = -ENODEV;
+	} else {
+		psmouse_dbg(psmouse, "trackstick E7 report: %3ph\n", param);
+		if (alps_trackstick_enter_extended_mode_v3_v6(psmouse)) {
+			psmouse_err(psmouse, "Failed to enter into trackstick extended mode\n");
+			ret = -EIO;
+		}
+	}
+
+	if (alps_passthrough_mode_v3(psmouse, reg_base, false))
+		return -EIO;
+
+	if (ret)
+		return ret;
+
+	if (alps_enter_command_mode(psmouse))
+		return -EIO;
+
+	reg_val = alps_command_mode_read_reg(psmouse, reg_base + 0x08);
+	if (reg_val == -1) {
+		ret = -EIO;
+	} else {
+		/*
+		 * Tell touchpad that trackstick is now in extended mode.
+		 * If bit 1 isn't set the packet format is different.
+		 */
+		reg_val |= BIT(1);
+		if (__alps_command_mode_write_reg(psmouse, reg_val))
+			ret = -EIO;
+	}
+
+	if (alps_exit_command_mode(psmouse))
+		return -EIO;
+
+	return ret;
+}
+
+static int alps_hw_init_v3(struct psmouse *psmouse)
+{
+	struct alps_data *priv = psmouse->private;
+	struct ps2dev *ps2dev = &psmouse->ps2dev;
+	int reg_val;
+	unsigned char param[4];
+
+	if ((priv->flags & ALPS_DUALPOINT) &&
+	    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_get_v3_v7_resolution(struct psmouse *psmouse, int reg_pitch)
+{
+	int reg, x_pitch, y_pitch, x_electrode, y_electrode, x_phys, y_phys;
+	struct alps_data *priv = psmouse->private;
+
+	reg = alps_command_mode_read_reg(psmouse, reg_pitch);
+	if (reg < 0)
+		return reg;
+
+	x_pitch = (s8)(reg << 4) >> 4; /* sign extend lower 4 bits */
+	x_pitch = 50 + 2 * x_pitch; /* In 0.1 mm units */
+
+	y_pitch = (s8)reg >> 4; /* sign extend upper 4 bits */
+	y_pitch = 36 + 2 * y_pitch; /* In 0.1 mm units */
+
+	reg = alps_command_mode_read_reg(psmouse, reg_pitch + 1);
+	if (reg < 0)
+		return reg;
+
+	x_electrode = (s8)(reg << 4) >> 4; /* sign extend lower 4 bits */
+	x_electrode = 17 + x_electrode;
+
+	y_electrode = (s8)reg >> 4; /* sign extend upper 4 bits */
+	y_electrode = 13 + y_electrode;
+
+	x_phys = x_pitch * (x_electrode - 1); /* In 0.1 mm units */
+	y_phys = y_pitch * (y_electrode - 1); /* In 0.1 mm units */
+
+	priv->x_res = priv->x_max * 10 / x_phys; /* units / mm */
+	priv->y_res = priv->y_max * 10 / y_phys; /* units / mm */
+
+	psmouse_dbg(psmouse,
+		    "pitch %dx%d num-electrodes %dx%d physical size %dx%d mm res %dx%d\n",
+		    x_pitch, y_pitch, x_electrode, y_electrode,
+		    x_phys / 10, y_phys / 10, priv->x_res, priv->y_res);
+
+	return 0;
+}
+
+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 (alps_enter_command_mode(psmouse) ||
+	    alps_command_mode_read_reg(psmouse, 0xc2d9) == -1 ||
+	    alps_command_mode_write_reg(psmouse, 0xc2cb, 0x00))
+		goto error;
+
+	if (alps_get_v3_v7_resolution(psmouse, 0xc2da))
+		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_get_otp_values_ss4_v2(struct psmouse *psmouse,
+				      unsigned char index, unsigned char otp[])
+{
+	struct ps2dev *ps2dev = &psmouse->ps2dev;
+
+	switch (index) {
+	case 0:
+		if (ps2_command(ps2dev, NULL, PSMOUSE_CMD_SETSTREAM)  ||
+		    ps2_command(ps2dev, NULL, PSMOUSE_CMD_SETSTREAM)  ||
+		    ps2_command(ps2dev, otp, PSMOUSE_CMD_GETINFO))
+			return -1;
+
+		break;
+
+	case 1:
+		if (ps2_command(ps2dev, NULL, PSMOUSE_CMD_SETPOLL)  ||
+		    ps2_command(ps2dev, NULL, PSMOUSE_CMD_SETPOLL)  ||
+		    ps2_command(ps2dev, otp, PSMOUSE_CMD_GETINFO))
+			return -1;
+
+		break;
+	}
+
+	return 0;
+}
+
+static int alps_update_device_area_ss4_v2(unsigned char otp[][4],
+					  struct alps_data *priv)
+{
+	int num_x_electrode;
+	int num_y_electrode;
+	int x_pitch, y_pitch, x_phys, y_phys;
+
+	if (IS_SS4PLUS_DEV(priv->dev_id)) {
+		num_x_electrode =
+			SS4PLUS_NUMSENSOR_XOFFSET + (otp[0][2] & 0x0F);
+		num_y_electrode =
+			SS4PLUS_NUMSENSOR_YOFFSET + ((otp[0][2] >> 4) & 0x0F);
+
+		priv->x_max =
+			(num_x_electrode - 1) * SS4PLUS_COUNT_PER_ELECTRODE;
+		priv->y_max =
+			(num_y_electrode - 1) * SS4PLUS_COUNT_PER_ELECTRODE;
+
+		x_pitch = (otp[0][1] & 0x0F) + SS4PLUS_MIN_PITCH_MM;
+		y_pitch = ((otp[0][1] >> 4) & 0x0F) + SS4PLUS_MIN_PITCH_MM;
+
+	} else {
+		num_x_electrode =
+			SS4_NUMSENSOR_XOFFSET + (otp[1][0] & 0x0F);
+		num_y_electrode =
+			SS4_NUMSENSOR_YOFFSET + ((otp[1][0] >> 4) & 0x0F);
+
+		priv->x_max =
+			(num_x_electrode - 1) * SS4_COUNT_PER_ELECTRODE;
+		priv->y_max =
+			(num_y_electrode - 1) * SS4_COUNT_PER_ELECTRODE;
+
+		x_pitch = ((otp[1][2] >> 2) & 0x07) + SS4_MIN_PITCH_MM;
+		y_pitch = ((otp[1][2] >> 5) & 0x07) + SS4_MIN_PITCH_MM;
+	}
+
+	x_phys = x_pitch * (num_x_electrode - 1); /* In 0.1 mm units */
+	y_phys = y_pitch * (num_y_electrode - 1); /* In 0.1 mm units */
+
+	priv->x_res = priv->x_max * 10 / x_phys; /* units / mm */
+	priv->y_res = priv->y_max * 10 / y_phys; /* units / mm */
+
+	return 0;
+}
+
+static int alps_update_btn_info_ss4_v2(unsigned char otp[][4],
+				       struct alps_data *priv)
+{
+	unsigned char is_btnless;
+
+	if (IS_SS4PLUS_DEV(priv->dev_id))
+		is_btnless = (otp[1][0] >> 1) & 0x01;
+	else
+		is_btnless = (otp[1][1] >> 3) & 0x01;
+
+	if (is_btnless)
+		priv->flags |= ALPS_BUTTONPAD;
+
+	return 0;
+}
+
+static int alps_update_dual_info_ss4_v2(unsigned char otp[][4],
+					struct alps_data *priv,
+					struct psmouse *psmouse)
+{
+	bool is_dual = false;
+	int reg_val = 0;
+	struct ps2dev *ps2dev = &psmouse->ps2dev;
+
+	if (IS_SS4PLUS_DEV(priv->dev_id)) {
+		is_dual = (otp[0][0] >> 4) & 0x01;
+
+		if (!is_dual) {
+			/* For support TrackStick of Thinkpad L/E series */
+			if (alps_exit_command_mode(psmouse) == 0 &&
+				alps_enter_command_mode(psmouse) == 0) {
+				reg_val = alps_command_mode_read_reg(psmouse,
+									0xD7);
+			}
+			alps_exit_command_mode(psmouse);
+			ps2_command(ps2dev, NULL, PSMOUSE_CMD_ENABLE);
+
+			if (reg_val == 0x0C || reg_val == 0x1D)
+				is_dual = true;
+		}
+	}
+
+	if (is_dual)
+		priv->flags |= ALPS_DUALPOINT |
+					ALPS_DUALPOINT_WITH_PRESSURE;
+
+	return 0;
+}
+
+static int alps_set_defaults_ss4_v2(struct psmouse *psmouse,
+				    struct alps_data *priv)
+{
+	unsigned char otp[2][4];
+
+	memset(otp, 0, sizeof(otp));
+
+	if (alps_get_otp_values_ss4_v2(psmouse, 1, &otp[1][0]) ||
+	    alps_get_otp_values_ss4_v2(psmouse, 0, &otp[0][0]))
+		return -1;
+
+	alps_update_device_area_ss4_v2(otp, priv);
+
+	alps_update_btn_info_ss4_v2(otp, priv);
+
+	alps_update_dual_info_ss4_v2(otp, priv, psmouse);
+
+	return 0;
+}
+
+static int alps_dolphin_get_device_area(struct psmouse *psmouse,
+					struct alps_data *priv)
+{
+	struct ps2dev *ps2dev = &psmouse->ps2dev;
+	unsigned char param[4] = {0};
+	int num_x_electrode, num_y_electrode;
+
+	if (alps_enter_command_mode(psmouse))
+		return -1;
+
+	param[0] = 0x0a;
+	if (ps2_command(ps2dev, NULL, PSMOUSE_CMD_RESET_WRAP) ||
+	    ps2_command(ps2dev, NULL, PSMOUSE_CMD_SETPOLL) ||
+	    ps2_command(ps2dev, NULL, PSMOUSE_CMD_SETPOLL) ||
+	    ps2_command(ps2dev, &param[0], PSMOUSE_CMD_SETRATE) ||
+	    ps2_command(ps2dev, &param[0], PSMOUSE_CMD_SETRATE))
+		return -1;
+
+	if (ps2_command(ps2dev, param, PSMOUSE_CMD_GETINFO))
+		return -1;
+
+	/*
+	 * Dolphin's sensor line number is not fixed. It can be calculated
+	 * by adding the device's register value with DOLPHIN_PROFILE_X/YOFFSET.
+	 * Further more, we can get device's x_max and y_max by multiplying
+	 * sensor line number with DOLPHIN_COUNT_PER_ELECTRODE.
+	 *
+	 * e.g. When we get register's sensor_x = 11 & sensor_y = 8,
+	 *	real sensor line number X = 11 + 8 = 19, and
+	 *	real sensor line number Y = 8 + 1 = 9.
+	 *	So, x_max = (19 - 1) * 64 = 1152, and
+	 *	    y_max = (9 - 1) * 64 = 512.
+	 */
+	num_x_electrode = DOLPHIN_PROFILE_XOFFSET + (param[2] & 0x0F);
+	num_y_electrode = DOLPHIN_PROFILE_YOFFSET + ((param[2] >> 4) & 0x0F);
+	priv->x_bits = num_x_electrode;
+	priv->y_bits = num_y_electrode;
+	priv->x_max = (num_x_electrode - 1) * DOLPHIN_COUNT_PER_ELECTRODE;
+	priv->y_max = (num_y_electrode - 1) * DOLPHIN_COUNT_PER_ELECTRODE;
+
+	if (alps_exit_command_mode(psmouse))
+		return -1;
+
+	return 0;
+}
+
+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 int alps_hw_init_v7(struct psmouse *psmouse)
+{
+	struct ps2dev *ps2dev = &psmouse->ps2dev;
+	int reg_val, ret = -1;
+
+	if (alps_enter_command_mode(psmouse) ||
+	    alps_command_mode_read_reg(psmouse, 0xc2d9) == -1)
+		goto error;
+
+	if (alps_get_v3_v7_resolution(psmouse, 0xc397))
+		goto error;
+
+	if (alps_command_mode_write_reg(psmouse, 0xc2c9, 0x64))
+		goto error;
+
+	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;
+}
+
+static int alps_hw_init_ss4_v2(struct psmouse *psmouse)
+{
+	struct ps2dev *ps2dev = &psmouse->ps2dev;
+	char param[2] = {0x64, 0x28};
+	int ret = -1;
+
+	/* enter absolute mode */
+	if (ps2_command(ps2dev, NULL, PSMOUSE_CMD_SETSTREAM) ||
+	    ps2_command(ps2dev, NULL, PSMOUSE_CMD_SETSTREAM) ||
+	    ps2_command(ps2dev, &param[0], PSMOUSE_CMD_SETRATE) ||
+	    ps2_command(ps2dev, &param[1], PSMOUSE_CMD_SETRATE)) {
+		goto error;
+	}
+
+	/* T.B.D. Decread noise packet number, delete in the future */
+	if (alps_exit_command_mode(psmouse) ||
+	    alps_enter_command_mode(psmouse) ||
+	    alps_command_mode_write_reg(psmouse, 0x001D, 0x20)) {
+		goto error;
+	}
+	alps_exit_command_mode(psmouse);
+
+	return ps2_command(ps2dev, NULL, PSMOUSE_CMD_ENABLE);
+
+error:
+	alps_exit_command_mode(psmouse);
+	return ret;
+}
+
+static int alps_set_protocol(struct psmouse *psmouse,
+			     struct alps_data *priv,
+			     const struct alps_protocol_info *protocol)
+{
+	psmouse->private = priv;
+
+	timer_setup(&priv->timer, alps_flush_packet, 0);
+
+	priv->proto_version = protocol->version;
+	priv->byte0 = protocol->byte0;
+	priv->mask0 = protocol->mask0;
+	priv->flags = protocol->flags;
+
+	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;
+		priv->x_max = 1023;
+		priv->y_max = 767;
+		if (dmi_check_system(alps_dmi_has_separate_stick_buttons))
+			priv->flags |= ALPS_STICK_BITS;
+		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_semi_mt;
+		priv->decode_fields = alps_decode_pinnacle;
+		priv->nibble_commands = alps_v3_nibble_commands;
+		priv->addr_command = PSMOUSE_CMD_RESET_WRAP;
+
+		if (alps_probe_trackstick_v3_v7(psmouse,
+						ALPS_REG_BASE_PINNACLE) < 0)
+			priv->flags &= ~ALPS_DUALPOINT;
+
+		break;
+
+	case ALPS_PROTO_V3_RUSHMORE:
+		priv->hw_init = alps_hw_init_rushmore_v3;
+		priv->process_packet = alps_process_packet_v3;
+		priv->set_abs_params = alps_set_abs_params_semi_mt;
+		priv->decode_fields = alps_decode_rushmore;
+		priv->nibble_commands = alps_v3_nibble_commands;
+		priv->addr_command = PSMOUSE_CMD_RESET_WRAP;
+		priv->x_bits = 16;
+		priv->y_bits = 12;
+
+		if (alps_probe_trackstick_v3_v7(psmouse,
+						ALPS_REG_BASE_RUSHMORE) < 0)
+			priv->flags &= ~ALPS_DUALPOINT;
+
+		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_semi_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_touchpad_packet_v3_v5;
+		priv->decode_fields = alps_decode_dolphin;
+		priv->set_abs_params = alps_set_abs_params_semi_mt;
+		priv->nibble_commands = alps_v3_nibble_commands;
+		priv->addr_command = PSMOUSE_CMD_RESET_WRAP;
+		priv->x_bits = 23;
+		priv->y_bits = 12;
+
+		if (alps_dolphin_get_device_area(psmouse, priv))
+			return -EIO;
+
+		break;
+
+	case ALPS_PROTO_V6:
+		priv->hw_init = alps_hw_init_v6;
+		priv->process_packet = alps_process_packet_v6;
+		priv->set_abs_params = alps_set_abs_params_st;
+		priv->nibble_commands = alps_v6_nibble_commands;
+		priv->x_max = 2047;
+		priv->y_max = 1535;
+		break;
+
+	case ALPS_PROTO_V7:
+		priv->hw_init = alps_hw_init_v7;
+		priv->process_packet = alps_process_packet_v7;
+		priv->decode_fields = alps_decode_packet_v7;
+		priv->set_abs_params = alps_set_abs_params_v7;
+		priv->nibble_commands = alps_v3_nibble_commands;
+		priv->addr_command = PSMOUSE_CMD_RESET_WRAP;
+		priv->x_max = 0xfff;
+		priv->y_max = 0x7ff;
+
+		if (priv->fw_ver[1] != 0xba)
+			priv->flags |= ALPS_BUTTONPAD;
+
+		if (alps_probe_trackstick_v3_v7(psmouse, ALPS_REG_BASE_V7) < 0)
+			priv->flags &= ~ALPS_DUALPOINT;
+
+		break;
+
+	case ALPS_PROTO_V8:
+		priv->hw_init = alps_hw_init_ss4_v2;
+		priv->process_packet = alps_process_packet_ss4_v2;
+		priv->decode_fields = alps_decode_ss4_v2;
+		priv->set_abs_params = alps_set_abs_params_ss4_v2;
+		priv->nibble_commands = alps_v3_nibble_commands;
+		priv->addr_command = PSMOUSE_CMD_RESET_WRAP;
+
+		if (alps_set_defaults_ss4_v2(psmouse, priv))
+			return -EIO;
+
+		break;
+	}
+
+	return 0;
+}
+
+static const struct alps_protocol_info *alps_match_table(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)))
+			return &model->protocol_info;
+	}
+
+	return NULL;
+}
+
+static bool alps_is_cs19_trackpoint(struct psmouse *psmouse)
+{
+	u8 param[2] = { 0 };
+
+	if (ps2_command(&psmouse->ps2dev,
+			param, MAKE_PS2_CMD(0, 2, TP_READ_ID)))
+		return false;
+
+	/*
+	 * param[0] contains the trackpoint device variant_id while
+	 * param[1] contains the firmware_id. So far all alps
+	 * trackpoint-only devices have their variant_ids equal
+	 * TP_VARIANT_ALPS and their firmware_ids are in 0x20~0x2f range.
+	 */
+	return param[0] == TP_VARIANT_ALPS && ((param[1] & 0xf0) == 0x20);
+}
+
+static int alps_identify(struct psmouse *psmouse, struct alps_data *priv)
+{
+	const struct alps_protocol_info *protocol;
+	unsigned char e6[4], e7[4], ec[4];
+	int error;
+
+	/*
+	 * 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;
+
+	protocol = alps_match_table(e7, ec);
+	if (!protocol) {
+		if (e7[0] == 0x73 && e7[1] == 0x02 && e7[2] == 0x64 &&
+			   ec[2] == 0x8a) {
+			protocol = &alps_v4_protocol_data;
+		} else if (e7[0] == 0x73 && e7[1] == 0x03 && e7[2] == 0x50 &&
+			   ec[0] == 0x73 && (ec[1] == 0x01 || ec[1] == 0x02)) {
+			protocol = &alps_v5_protocol_data;
+		} else if (ec[0] == 0x88 &&
+			   ((ec[1] & 0xf0) == 0xb0 || (ec[1] & 0xf0) == 0xc0)) {
+			protocol = &alps_v7_protocol_data;
+		} else if (ec[0] == 0x88 && ec[1] == 0x08) {
+			protocol = &alps_v3_rushmore_data;
+		} else if (ec[0] == 0x88 && ec[1] == 0x07 &&
+			   ec[2] >= 0x90 && ec[2] <= 0x9d) {
+			protocol = &alps_v3_protocol_data;
+		} else if (e7[0] == 0x73 && e7[1] == 0x03 &&
+			   (e7[2] == 0x14 || e7[2] == 0x28)) {
+			protocol = &alps_v8_protocol_data;
+		} else if (e7[0] == 0x73 && e7[1] == 0x03 && e7[2] == 0xc8) {
+			protocol = &alps_v9_protocol_data;
+			psmouse_warn(psmouse,
+				     "Unsupported ALPS V9 touchpad: E7=%3ph, EC=%3ph\n",
+				     e7, ec);
+			return -EINVAL;
+		} else {
+			psmouse_dbg(psmouse,
+				    "Likely not an ALPS touchpad: E7=%3ph, EC=%3ph\n", e7, ec);
+			return -EINVAL;
+		}
+	}
+
+	if (priv) {
+		/* Save Device ID and Firmware version */
+		memcpy(priv->dev_id, e7, 3);
+		memcpy(priv->fw_ver, ec, 3);
+		error = alps_set_protocol(psmouse, priv, protocol);
+		if (error)
+			return error;
+	}
+
+	return 0;
+}
+
+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);
+	timer_shutdown_sync(&priv->timer);
+	if (priv->dev2)
+		input_unregister_device(priv->dev2);
+	if (!IS_ERR_OR_NULL(priv->dev3))
+		input_unregister_device(priv->dev3);
+	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, priv->x_max, 0, 0);
+	input_set_abs_params(dev1, ABS_Y, 0, priv->y_max, 0, 0);
+	input_set_abs_params(dev1, ABS_PRESSURE, 0, 127, 0, 0);
+}
+
+static void alps_set_abs_params_mt_common(struct alps_data *priv,
+					  struct input_dev *dev1)
+{
+	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);
+
+	input_abs_set_res(dev1, ABS_MT_POSITION_X, priv->x_res);
+	input_abs_set_res(dev1, ABS_MT_POSITION_Y, priv->y_res);
+
+	set_bit(BTN_TOOL_TRIPLETAP, dev1->keybit);
+	set_bit(BTN_TOOL_QUADTAP, dev1->keybit);
+}
+
+static void alps_set_abs_params_semi_mt(struct alps_data *priv,
+					struct input_dev *dev1)
+{
+	alps_set_abs_params_mt_common(priv, dev1);
+	input_set_abs_params(dev1, ABS_PRESSURE, 0, 127, 0, 0);
+
+	input_mt_init_slots(dev1, MAX_TOUCHES,
+			    INPUT_MT_POINTER | INPUT_MT_DROP_UNUSED |
+				INPUT_MT_SEMI_MT);
+}
+
+static void alps_set_abs_params_v7(struct alps_data *priv,
+				   struct input_dev *dev1)
+{
+	alps_set_abs_params_mt_common(priv, dev1);
+	set_bit(BTN_TOOL_QUINTTAP, dev1->keybit);
+
+	input_mt_init_slots(dev1, MAX_TOUCHES,
+			    INPUT_MT_POINTER | INPUT_MT_DROP_UNUSED |
+				INPUT_MT_TRACK);
+
+	set_bit(BTN_TOOL_QUINTTAP, dev1->keybit);
+}
+
+static void alps_set_abs_params_ss4_v2(struct alps_data *priv,
+				       struct input_dev *dev1)
+{
+	alps_set_abs_params_mt_common(priv, dev1);
+	input_set_abs_params(dev1, ABS_PRESSURE, 0, 127, 0, 0);
+	set_bit(BTN_TOOL_QUINTTAP, dev1->keybit);
+
+	input_mt_init_slots(dev1, MAX_TOUCHES,
+			    INPUT_MT_POINTER | INPUT_MT_DROP_UNUSED |
+				INPUT_MT_TRACK);
+}
+
+int alps_init(struct psmouse *psmouse)
+{
+	struct alps_data *priv = psmouse->private;
+	struct input_dev *dev1 = psmouse->dev;
+	int error;
+
+	error = priv->hw_init(psmouse);
+	if (error)
+		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);
+
+	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 if (priv->flags & ALPS_BUTTONPAD) {
+		set_bit(INPUT_PROP_BUTTONPAD, dev1->propbit);
+		clear_bit(BTN_RIGHT, dev1->keybit);
+	} else {
+		dev1->keybit[BIT_WORD(BTN_MIDDLE)] |= BIT_MASK(BTN_MIDDLE);
+	}
+
+	if (priv->flags & ALPS_DUALPOINT) {
+		struct input_dev *dev2;
+
+		dev2 = input_allocate_device();
+		if (!dev2) {
+			psmouse_err(psmouse,
+				    "failed to allocate trackstick device\n");
+			error = -ENOMEM;
+			goto init_fail;
+		}
+
+		snprintf(priv->phys2, sizeof(priv->phys2), "%s/input1",
+			 psmouse->ps2dev.serio->phys);
+		dev2->phys = priv->phys2;
+
+		/*
+		 * format of input device name is: "protocol vendor name"
+		 * see function psmouse_switch_protocol() in psmouse-base.c
+		 */
+		dev2->name = "AlpsPS/2 ALPS DualPoint Stick";
+
+		dev2->id.bustype = BUS_I8042;
+		dev2->id.vendor  = 0x0002;
+		dev2->id.product = PSMOUSE_ALPS;
+		dev2->id.version = priv->proto_version;
+		dev2->dev.parent = &psmouse->ps2dev.serio->dev;
+
+		input_set_capability(dev2, EV_REL, REL_X);
+		input_set_capability(dev2, EV_REL, REL_Y);
+		if (priv->flags & ALPS_DUALPOINT_WITH_PRESSURE) {
+			input_set_capability(dev2, EV_ABS, ABS_PRESSURE);
+			input_set_abs_params(dev2, ABS_PRESSURE, 0, 127, 0, 0);
+		}
+		input_set_capability(dev2, EV_KEY, BTN_LEFT);
+		input_set_capability(dev2, EV_KEY, BTN_RIGHT);
+		input_set_capability(dev2, EV_KEY, BTN_MIDDLE);
+
+		__set_bit(INPUT_PROP_POINTER, dev2->propbit);
+		__set_bit(INPUT_PROP_POINTING_STICK, dev2->propbit);
+
+		error = input_register_device(dev2);
+		if (error) {
+			psmouse_err(psmouse,
+				    "failed to register trackstick device: %d\n",
+				    error);
+			input_free_device(dev2);
+			goto init_fail;
+		}
+
+		priv->dev2 = dev2;
+	}
+
+	priv->psmouse = psmouse;
+
+	INIT_DELAYED_WORK(&priv->dev3_register_work,
+			  alps_register_bare_ps2_mouse);
+
+	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);
+	/*
+	 * Even though we did not allocate psmouse->private we do free
+	 * it here.
+	 */
+	kfree(psmouse->private);
+	psmouse->private = NULL;
+	return error;
+}
+
+int alps_detect(struct psmouse *psmouse, bool set_properties)
+{
+	struct alps_data *priv;
+	int error;
+
+	error = alps_identify(psmouse, NULL);
+	if (error)
+		return error;
+
+	/*
+	 * ALPS cs19 is a trackpoint-only device, and uses different
+	 * protocol than DualPoint ones, so we return -EINVAL here and let
+	 * trackpoint.c drive this device. If the trackpoint driver is not
+	 * enabled, the device will fall back to a bare PS/2 mouse.
+	 * If ps2_command() fails here, we depend on the immediately
+	 * followed psmouse_reset() to reset the device to normal state.
+	 */
+	if (alps_is_cs19_trackpoint(psmouse)) {
+		psmouse_dbg(psmouse,
+			    "ALPS CS19 trackpoint-only device detected, ignoring\n");
+		return -EINVAL;
+	}
+
+	/*
+	 * Reset the device to make sure it is fully operational:
+	 * on some laptops, like certain Dell Latitudes, we may
+	 * fail to properly detect presence of trackstick if device
+	 * has not been reset.
+	 */
+	psmouse_reset(psmouse);
+
+	priv = kzalloc(sizeof(struct alps_data), GFP_KERNEL);
+	if (!priv)
+		return -ENOMEM;
+
+	error = alps_identify(psmouse, priv);
+	if (error) {
+		kfree(priv);
+		return error;
+	}
+
+	if (set_properties) {
+		psmouse->vendor = "ALPS";
+		psmouse->name = priv->flags & ALPS_DUALPOINT ?
+				"DualPoint TouchPad" : "GlidePoint";
+		psmouse->model = priv->proto_version;
+	} else {
+		/*
+		 * Destroy alps_data structure we allocated earlier since
+		 * this was just a "trial run". Otherwise we'll keep it
+		 * to be used by alps_init() which has to be called if
+		 * we succeed and set_properties is true.
+		 */
+		kfree(priv);
+		psmouse->private = NULL;
+	}
+
+	return 0;
+}
+