OSCL-LXR linux-6.0.1/​drivers/​input/​mouse/​alps.c	Source navigation Diff markup Identifier search General search
	Version: linux-6.0.1 spark-3.0.0 hadoop-3.2.0-src hadoop-3.3.0-src spark-2.4.7 linux-4.15.13 hadoop-2.7.4-src Revert   Change

 // 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, (char)x / 4);
         input_report_rel(dev2, REL_Y, -((char)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, (char)x);
     input_report_rel(dev2, REL_Y, -((char)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 = (char)(reg << 4) >> 4; /* sign extend lower 4 bits */
     x_pitch = 50 + 2 * x_pitch; /* In 0.1 mm units */
 
     y_pitch = (char)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 = (char)(reg << 4) >> 4; /* sign extend lower 4 bits */
     x_electrode = 17 + x_electrode;
 
     y_electrode = (char)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);
     del_timer_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;
 }