drivers/input/mouse/alps.c

   1 /*
   2  * ALPS touchpad PS/2 mouse driver
   3  *
   4  * Copyright (c) 2003 Neil Brown <neilb@cse.unsw.edu.au>
   5  * Copyright (c) 2003-2005 Peter Osterlund <petero2@telia.com>
   6  * Copyright (c) 2004 Dmitry Torokhov <dtor@mail.ru>
   7  * Copyright (c) 2005 Vojtech Pavlik <vojtech@suse.cz>
   8  * Copyright (c) 2009 Sebastian Kapfer <sebastian_kapfer@gmx.net>
   9  *
  10  * ALPS detection, tap switching and status querying info is taken from
  11  * tpconfig utility (by C. Scott Ananian and Bruce Kall).
  12  *
  13  * This program is free software; you can redistribute it and/or modify it
  14  * under the terms of the GNU General Public License version 2 as published by
  15  * the Free Software Foundation.
  16  */
  17
  18 #include <linux/slab.h>
  19 #include <linux/input.h>
  20 #include <linux/input/mt.h>
  21 #include <linux/serio.h>
  22 #include <linux/libps2.h>
  23 #include <linux/dmi.h>
  24
  25 #include "psmouse.h"
  26 #include "alps.h"
  27
  28 /*
  29  * Definitions for ALPS version 3 and 4 command mode protocol
  30  */
  31 #define ALPS_CMD_NIBBLE_10      0x01f2
  32
  33 #define ALPS_REG_BASE_RUSHMORE  0xc2c0
  34 #define ALPS_REG_BASE_V7        0xc2c0
  35 #define ALPS_REG_BASE_PINNACLE  0x0000
  36
  37 static const struct alps_nibble_commands alps_v3_nibble_commands[] = {
  38         { PSMOUSE_CMD_SETPOLL,          0x00 }, /* 0 */
  39         { PSMOUSE_CMD_RESET_DIS,        0x00 }, /* 1 */
  40         { PSMOUSE_CMD_SETSCALE21,       0x00 }, /* 2 */
  41         { PSMOUSE_CMD_SETRATE,          0x0a }, /* 3 */
  42         { PSMOUSE_CMD_SETRATE,          0x14 }, /* 4 */
  43         { PSMOUSE_CMD_SETRATE,          0x28 }, /* 5 */
  44         { PSMOUSE_CMD_SETRATE,          0x3c }, /* 6 */
  45         { PSMOUSE_CMD_SETRATE,          0x50 }, /* 7 */
  46         { PSMOUSE_CMD_SETRATE,          0x64 }, /* 8 */
  47         { PSMOUSE_CMD_SETRATE,          0xc8 }, /* 9 */
  48         { ALPS_CMD_NIBBLE_10,           0x00 }, /* a */
  49         { PSMOUSE_CMD_SETRES,           0x00 }, /* b */
  50         { PSMOUSE_CMD_SETRES,           0x01 }, /* c */
  51         { PSMOUSE_CMD_SETRES,           0x02 }, /* d */
  52         { PSMOUSE_CMD_SETRES,           0x03 }, /* e */
  53         { PSMOUSE_CMD_SETSCALE11,       0x00 }, /* f */
  54 };
  55
  56 static const struct alps_nibble_commands alps_v4_nibble_commands[] = {
  57         { PSMOUSE_CMD_ENABLE,           0x00 }, /* 0 */
  58         { PSMOUSE_CMD_RESET_DIS,        0x00 }, /* 1 */
  59         { PSMOUSE_CMD_SETSCALE21,       0x00 }, /* 2 */
  60         { PSMOUSE_CMD_SETRATE,          0x0a }, /* 3 */
  61         { PSMOUSE_CMD_SETRATE,          0x14 }, /* 4 */
  62         { PSMOUSE_CMD_SETRATE,          0x28 }, /* 5 */
  63         { PSMOUSE_CMD_SETRATE,          0x3c }, /* 6 */
  64         { PSMOUSE_CMD_SETRATE,          0x50 }, /* 7 */
  65         { PSMOUSE_CMD_SETRATE,          0x64 }, /* 8 */
  66         { PSMOUSE_CMD_SETRATE,          0xc8 }, /* 9 */
  67         { ALPS_CMD_NIBBLE_10,           0x00 }, /* a */
  68         { PSMOUSE_CMD_SETRES,           0x00 }, /* b */
  69         { PSMOUSE_CMD_SETRES,           0x01 }, /* c */
  70         { PSMOUSE_CMD_SETRES,           0x02 }, /* d */
  71         { PSMOUSE_CMD_SETRES,           0x03 }, /* e */
  72         { PSMOUSE_CMD_SETSCALE11,       0x00 }, /* f */
  73 };
  74
  75 static const struct alps_nibble_commands alps_v6_nibble_commands[] = {
  76         { PSMOUSE_CMD_ENABLE,           0x00 }, /* 0 */
  77         { PSMOUSE_CMD_SETRATE,          0x0a }, /* 1 */
  78         { PSMOUSE_CMD_SETRATE,          0x14 }, /* 2 */
  79         { PSMOUSE_CMD_SETRATE,          0x28 }, /* 3 */
  80         { PSMOUSE_CMD_SETRATE,          0x3c }, /* 4 */
  81         { PSMOUSE_CMD_SETRATE,          0x50 }, /* 5 */
  82         { PSMOUSE_CMD_SETRATE,          0x64 }, /* 6 */
  83         { PSMOUSE_CMD_SETRATE,          0xc8 }, /* 7 */
  84         { PSMOUSE_CMD_GETID,            0x00 }, /* 8 */
  85         { PSMOUSE_CMD_GETINFO,          0x00 }, /* 9 */
  86         { PSMOUSE_CMD_SETRES,           0x00 }, /* a */
  87         { PSMOUSE_CMD_SETRES,           0x01 }, /* b */
  88         { PSMOUSE_CMD_SETRES,           0x02 }, /* c */
  89         { PSMOUSE_CMD_SETRES,           0x03 }, /* d */
  90         { PSMOUSE_CMD_SETSCALE21,       0x00 }, /* e */
  91         { PSMOUSE_CMD_SETSCALE11,       0x00 }, /* f */
  92 };
  93
  94
  95 #define ALPS_DUALPOINT          0x02    /* touchpad has trackstick */
  96 #define ALPS_PASS               0x04    /* device has a pass-through port */
  97
  98 #define ALPS_WHEEL              0x08    /* hardware wheel present */
  99 #define ALPS_FW_BK_1            0x10    /* front & back buttons present */
 100 #define ALPS_FW_BK_2            0x20    /* front & back buttons present */
 101 #define ALPS_FOUR_BUTTONS       0x40    /* 4 direction button present */
 102 #define ALPS_PS2_INTERLEAVED    0x80    /* 3-byte PS/2 packet interleaved with
 103                                            6-byte ALPS packet */
 104 #define ALPS_STICK_BITS         0x100   /* separate stick button bits */
 105 #define ALPS_BUTTONPAD          0x200   /* device is a clickpad */
 106 #define ALPS_DUALPOINT_WITH_PRESSURE    0x400   /* device can report trackpoint pressure */
 107
 108 static const struct alps_model_info alps_model_data[] = {
 109         /*
 110          * XXX This entry is suspicious. First byte has zero lower nibble,
 111          * which is what a normal mouse would report. Also, the value 0x0e
 112          * isn't valid per PS/2 spec.
 113          */
 114         { { 0x20, 0x02, 0x0e }, { ALPS_PROTO_V2, 0xf8, 0xf8, ALPS_PASS | ALPS_DUALPOINT } },
 115
 116         { { 0x22, 0x02, 0x0a }, { ALPS_PROTO_V2, 0xf8, 0xf8, ALPS_PASS | ALPS_DUALPOINT } },
 117         { { 0x22, 0x02, 0x14 }, { ALPS_PROTO_V2, 0xff, 0xff, ALPS_PASS | ALPS_DUALPOINT } },    /* Dell Latitude D600 */
 118         { { 0x32, 0x02, 0x14 }, { ALPS_PROTO_V2, 0xf8, 0xf8, ALPS_PASS | ALPS_DUALPOINT } },    /* Toshiba Salellite Pro M10 */
 119         { { 0x33, 0x02, 0x0a }, { ALPS_PROTO_V1, 0x88, 0xf8, 0 } },                             /* UMAX-530T */
 120         { { 0x52, 0x01, 0x14 }, { ALPS_PROTO_V2, 0xff, 0xff,
 121                 ALPS_PASS | ALPS_DUALPOINT | ALPS_PS2_INTERLEAVED } },                          /* Toshiba Tecra A11-11L */
 122         { { 0x53, 0x02, 0x0a }, { ALPS_PROTO_V2, 0xf8, 0xf8, 0 } },
 123         { { 0x53, 0x02, 0x14 }, { ALPS_PROTO_V2, 0xf8, 0xf8, 0 } },
 124         { { 0x60, 0x03, 0xc8 }, { ALPS_PROTO_V2, 0xf8, 0xf8, 0 } },                             /* HP ze1115 */
 125         { { 0x62, 0x02, 0x14 }, { ALPS_PROTO_V2, 0xcf, 0xcf,
 126                 ALPS_PASS | ALPS_DUALPOINT | ALPS_PS2_INTERLEAVED } },                          /* Dell Latitude E5500, E6400, E6500, Precision M4400 */
 127         { { 0x63, 0x02, 0x0a }, { ALPS_PROTO_V2, 0xf8, 0xf8, 0 } },
 128         { { 0x63, 0x02, 0x14 }, { ALPS_PROTO_V2, 0xf8, 0xf8, 0 } },
 129         { { 0x63, 0x02, 0x28 }, { ALPS_PROTO_V2, 0xf8, 0xf8, ALPS_FW_BK_2 } },                  /* Fujitsu Siemens S6010 */
 130         { { 0x63, 0x02, 0x3c }, { ALPS_PROTO_V2, 0x8f, 0x8f, ALPS_WHEEL } },                    /* Toshiba Satellite S2400-103 */
 131         { { 0x63, 0x02, 0x50 }, { ALPS_PROTO_V2, 0xef, 0xef, ALPS_FW_BK_1 } },                  /* NEC Versa L320 */
 132         { { 0x63, 0x02, 0x64 }, { ALPS_PROTO_V2, 0xf8, 0xf8, 0 } },
 133         { { 0x63, 0x03, 0xc8 }, { ALPS_PROTO_V2, 0xf8, 0xf8, ALPS_PASS | ALPS_DUALPOINT } },    /* Dell Latitude D800 */
 134         { { 0x73, 0x00, 0x0a }, { ALPS_PROTO_V2, 0xf8, 0xf8, ALPS_DUALPOINT } },                /* ThinkPad R61 8918-5QG */
 135         { { 0x73, 0x00, 0x14 }, { ALPS_PROTO_V6, 0xff, 0xff, ALPS_DUALPOINT } },                /* Dell XT2 */
 136         { { 0x73, 0x02, 0x0a }, { ALPS_PROTO_V2, 0xf8, 0xf8, 0 } },
 137         { { 0x73, 0x02, 0x14 }, { ALPS_PROTO_V2, 0xf8, 0xf8, ALPS_FW_BK_2 } },                  /* Ahtec Laptop */
 138         { { 0x73, 0x02, 0x50 }, { ALPS_PROTO_V2, 0xcf, 0xcf, ALPS_FOUR_BUTTONS } },             /* Dell Vostro 1400 */
 139 };
 140
 141 static const struct alps_protocol_info alps_v3_protocol_data = {
 142         ALPS_PROTO_V3, 0x8f, 0x8f, ALPS_DUALPOINT | ALPS_DUALPOINT_WITH_PRESSURE
 143 };
 144
 145 static const struct alps_protocol_info alps_v3_rushmore_data = {
 146         ALPS_PROTO_V3_RUSHMORE, 0x8f, 0x8f, ALPS_DUALPOINT | ALPS_DUALPOINT_WITH_PRESSURE
 147 };
 148
 149 static const struct alps_protocol_info alps_v4_protocol_data = {
 150         ALPS_PROTO_V4, 0x8f, 0x8f, 0
 151 };
 152
 153 static const struct alps_protocol_info alps_v5_protocol_data = {
 154         ALPS_PROTO_V5, 0xc8, 0xd8, 0
 155 };
 156
 157 static const struct alps_protocol_info alps_v7_protocol_data = {
 158         ALPS_PROTO_V7, 0x48, 0x48, ALPS_DUALPOINT | ALPS_DUALPOINT_WITH_PRESSURE
 159 };
 160
 161 static const struct alps_protocol_info alps_v8_protocol_data = {
 162         ALPS_PROTO_V8, 0x18, 0x18, 0
 163 };
 164
 165 static const struct alps_protocol_info alps_v9_protocol_data = {
 166         ALPS_PROTO_V9, 0xc8, 0xc8, 0
 167 };
 168
 169 /*
 170  * Some v2 models report the stick buttons in separate bits
 171  */
 172 static const struct dmi_system_id alps_dmi_has_separate_stick_buttons[] = {
 173 #if defined(CONFIG_DMI) && defined(CONFIG_X86)
 174         {
 175                 /* Extrapolated from other entries */
 176                 .matches = {
 177                         DMI_MATCH(DMI_SYS_VENDOR, "Dell Inc."),
 178                         DMI_MATCH(DMI_PRODUCT_NAME, "Latitude D420"),
 179                 },
 180         },
 181         {
 182                 /* Reported-by: Hans de Bruin <jmdebruin@xmsnet.nl> */
 183                 .matches = {
 184                         DMI_MATCH(DMI_SYS_VENDOR, "Dell Inc."),
 185                         DMI_MATCH(DMI_PRODUCT_NAME, "Latitude D430"),
 186                 },
 187         },
 188         {
 189                 /* Reported-by: Hans de Goede <hdegoede@redhat.com> */
 190                 .matches = {
 191                         DMI_MATCH(DMI_SYS_VENDOR, "Dell Inc."),
 192                         DMI_MATCH(DMI_PRODUCT_NAME, "Latitude D620"),
 193                 },
 194         },
 195         {
 196                 /* Extrapolated from other entries */
 197                 .matches = {
 198                         DMI_MATCH(DMI_SYS_VENDOR, "Dell Inc."),
 199                         DMI_MATCH(DMI_PRODUCT_NAME, "Latitude D630"),
 200                 },
 201         },
 202 #endif
 203         { }
 204 };
 205
 206 static void alps_set_abs_params_st(struct alps_data *priv,
 207                                    struct input_dev *dev1);
 208 static void alps_set_abs_params_semi_mt(struct alps_data *priv,
 209                                         struct input_dev *dev1);
 210 static void alps_set_abs_params_v7(struct alps_data *priv,
 211                                    struct input_dev *dev1);
 212 static void alps_set_abs_params_ss4_v2(struct alps_data *priv,
 213                                        struct input_dev *dev1);
 214
 215 /* Packet formats are described in Documentation/input/devices/alps.rst */
 216
 217 static bool alps_is_valid_first_byte(struct alps_data *priv,
 218                                      unsigned char data)
 219 {
 220         return (data & priv->mask0) == priv->byte0;
 221 }
 222
 223 static void alps_report_buttons(struct input_dev *dev1, struct input_dev *dev2,
 224                                 int left, int right, int middle)
 225 {
 226         struct input_dev *dev;
 227
 228         /*
 229          * If shared button has already been reported on the
 230          * other device (dev2) then this event should be also
 231          * sent through that device.
 232          */
 233         dev = (dev2 && test_bit(BTN_LEFT, dev2->key)) ? dev2 : dev1;
 234         input_report_key(dev, BTN_LEFT, left);
 235
 236         dev = (dev2 && test_bit(BTN_RIGHT, dev2->key)) ? dev2 : dev1;
 237         input_report_key(dev, BTN_RIGHT, right);
 238
 239         dev = (dev2 && test_bit(BTN_MIDDLE, dev2->key)) ? dev2 : dev1;
 240         input_report_key(dev, BTN_MIDDLE, middle);
 241
 242         /*
 243          * Sync the _other_ device now, we'll do the first
 244          * device later once we report the rest of the events.
 245          */
 246         if (dev2)
 247                 input_sync(dev2);
 248 }
 249
 250 static void alps_process_packet_v1_v2(struct psmouse *psmouse)
 251 {
 252         struct alps_data *priv = psmouse->private;
 253         unsigned char *packet = psmouse->packet;
 254         struct input_dev *dev = psmouse->dev;
 255         struct input_dev *dev2 = priv->dev2;
 256         int x, y, z, ges, fin, left, right, middle;
 257         int back = 0, forward = 0;
 258
 259         if (priv->proto_version == ALPS_PROTO_V1) {
 260                 left = packet[2] & 0x10;
 261                 right = packet[2] & 0x08;
 262                 middle = 0;
 263                 x = packet[1] | ((packet[0] & 0x07) << 7);
 264                 y = packet[4] | ((packet[3] & 0x07) << 7);
 265                 z = packet[5];
 266         } else {
 267                 left = packet[3] & 1;
 268                 right = packet[3] & 2;
 269                 middle = packet[3] & 4;
 270                 x = packet[1] | ((packet[2] & 0x78) << (7 - 3));
 271                 y = packet[4] | ((packet[3] & 0x70) << (7 - 4));
 272                 z = packet[5];
 273         }
 274
 275         if (priv->flags & ALPS_FW_BK_1) {
 276                 back = packet[0] & 0x10;
 277                 forward = packet[2] & 4;
 278         }
 279
 280         if (priv->flags & ALPS_FW_BK_2) {
 281                 back = packet[3] & 4;
 282                 forward = packet[2] & 4;
 283                 if ((middle = forward && back))
 284                         forward = back = 0;
 285         }
 286
 287         ges = packet[2] & 1;
 288         fin = packet[2] & 2;
 289
 290         if ((priv->flags & ALPS_DUALPOINT) && z == 127) {
 291                 input_report_rel(dev2, REL_X,  (x > 383 ? (x - 768) : x));
 292                 input_report_rel(dev2, REL_Y, -(y > 255 ? (y - 512) : y));
 293
 294                 alps_report_buttons(dev2, dev, left, right, middle);
 295
 296                 input_sync(dev2);
 297                 return;
 298         }
 299
 300         /* Some models have separate stick button bits */
 301         if (priv->flags & ALPS_STICK_BITS) {
 302                 left |= packet[0] & 1;
 303                 right |= packet[0] & 2;
 304                 middle |= packet[0] & 4;
 305         }
 306
 307         alps_report_buttons(dev, dev2, left, right, middle);
 308
 309         /* Convert hardware tap to a reasonable Z value */
 310         if (ges && !fin)
 311                 z = 40;
 312
 313         /*
 314          * A "tap and drag" operation is reported by the hardware as a transition
 315          * from (!fin && ges) to (fin && ges). This should be translated to the
 316          * sequence Z>0, Z==0, Z>0, so the Z==0 event has to be generated manually.
 317          */
 318         if (ges && fin && !priv->prev_fin) {
 319                 input_report_abs(dev, ABS_X, x);
 320                 input_report_abs(dev, ABS_Y, y);
 321                 input_report_abs(dev, ABS_PRESSURE, 0);
 322                 input_report_key(dev, BTN_TOOL_FINGER, 0);
 323                 input_sync(dev);
 324         }
 325         priv->prev_fin = fin;
 326
 327         if (z > 30)
 328                 input_report_key(dev, BTN_TOUCH, 1);
 329         if (z < 25)
 330                 input_report_key(dev, BTN_TOUCH, 0);
 331
 332         if (z > 0) {
 333                 input_report_abs(dev, ABS_X, x);
 334                 input_report_abs(dev, ABS_Y, y);
 335         }
 336
 337         input_report_abs(dev, ABS_PRESSURE, z);
 338         input_report_key(dev, BTN_TOOL_FINGER, z > 0);
 339
 340         if (priv->flags & ALPS_WHEEL)
 341                 input_report_rel(dev, REL_WHEEL, ((packet[2] << 1) & 0x08) - ((packet[0] >> 4) & 0x07));
 342
 343         if (priv->flags & (ALPS_FW_BK_1 | ALPS_FW_BK_2)) {
 344                 input_report_key(dev, BTN_FORWARD, forward);
 345                 input_report_key(dev, BTN_BACK, back);
 346         }
 347
 348         if (priv->flags & ALPS_FOUR_BUTTONS) {
 349                 input_report_key(dev, BTN_0, packet[2] & 4);
 350                 input_report_key(dev, BTN_1, packet[0] & 0x10);
 351                 input_report_key(dev, BTN_2, packet[3] & 4);
 352                 input_report_key(dev, BTN_3, packet[0] & 0x20);
 353         }
 354
 355         input_sync(dev);
 356 }
 357
 358 static void alps_get_bitmap_points(unsigned int map,
 359                                    struct alps_bitmap_point *low,
 360                                    struct alps_bitmap_point *high,
 361                                    int *fingers)
 362 {
 363         struct alps_bitmap_point *point;
 364         int i, bit, prev_bit = 0;
 365
 366         point = low;
 367         for (i = 0; map != 0; i++, map >>= 1) {
 368                 bit = map & 1;
 369                 if (bit) {
 370                         if (!prev_bit) {
 371                                 point->start_bit = i;
 372                                 point->num_bits = 0;
 373                                 (*fingers)++;
 374                         }
 375                         point->num_bits++;
 376                 } else {
 377                         if (prev_bit)
 378                                 point = high;
 379                 }
 380                 prev_bit = bit;
 381         }
 382 }
 383
 384 /*
 385  * Process bitmap data from semi-mt protocols. Returns the number of
 386  * fingers detected. A return value of 0 means at least one of the
 387  * bitmaps was empty.
 388  *
 389  * The bitmaps don't have enough data to track fingers, so this function
 390  * only generates points representing a bounding box of all contacts.
 391  * These points are returned in fields->mt when the return value
 392  * is greater than 0.
 393  */
 394 static int alps_process_bitmap(struct alps_data *priv,
 395                                struct alps_fields *fields)
 396 {
 397         int i, fingers_x = 0, fingers_y = 0, fingers, closest;
 398         struct alps_bitmap_point x_low = {0,}, x_high = {0,};
 399         struct alps_bitmap_point y_low = {0,}, y_high = {0,};
 400         struct input_mt_pos corner[4];
 401
 402         if (!fields->x_map || !fields->y_map)
 403                 return 0;
 404
 405         alps_get_bitmap_points(fields->x_map, &x_low, &x_high, &fingers_x);
 406         alps_get_bitmap_points(fields->y_map, &y_low, &y_high, &fingers_y);
 407
 408         /*
 409          * Fingers can overlap, so we use the maximum count of fingers
 410          * on either axis as the finger count.
 411          */
 412         fingers = max(fingers_x, fingers_y);
 413
 414         /*
 415          * If an axis reports only a single contact, we have overlapping or
 416          * adjacent fingers. Divide the single contact between the two points.
 417          */
 418         if (fingers_x == 1) {
 419                 i = (x_low.num_bits - 1) / 2;
 420                 x_low.num_bits = x_low.num_bits - i;
 421                 x_high.start_bit = x_low.start_bit + i;
 422                 x_high.num_bits = max(i, 1);
 423         }
 424         if (fingers_y == 1) {
 425                 i = (y_low.num_bits - 1) / 2;
 426                 y_low.num_bits = y_low.num_bits - i;
 427                 y_high.start_bit = y_low.start_bit + i;
 428                 y_high.num_bits = max(i, 1);
 429         }
 430
 431         /* top-left corner */
 432         corner[0].x =
 433                 (priv->x_max * (2 * x_low.start_bit + x_low.num_bits - 1)) /
 434                 (2 * (priv->x_bits - 1));
 435         corner[0].y =
 436                 (priv->y_max * (2 * y_low.start_bit + y_low.num_bits - 1)) /
 437                 (2 * (priv->y_bits - 1));
 438
 439         /* top-right corner */
 440         corner[1].x =
 441                 (priv->x_max * (2 * x_high.start_bit + x_high.num_bits - 1)) /
 442                 (2 * (priv->x_bits - 1));
 443         corner[1].y =
 444                 (priv->y_max * (2 * y_low.start_bit + y_low.num_bits - 1)) /
 445                 (2 * (priv->y_bits - 1));
 446
 447         /* bottom-right corner */
 448         corner[2].x =
 449                 (priv->x_max * (2 * x_high.start_bit + x_high.num_bits - 1)) /
 450                 (2 * (priv->x_bits - 1));
 451         corner[2].y =
 452                 (priv->y_max * (2 * y_high.start_bit + y_high.num_bits - 1)) /
 453                 (2 * (priv->y_bits - 1));
 454
 455         /* bottom-left corner */
 456         corner[3].x =
 457                 (priv->x_max * (2 * x_low.start_bit + x_low.num_bits - 1)) /
 458                 (2 * (priv->x_bits - 1));
 459         corner[3].y =
 460                 (priv->y_max * (2 * y_high.start_bit + y_high.num_bits - 1)) /
 461                 (2 * (priv->y_bits - 1));
 462
 463         /* x-bitmap order is reversed on v5 touchpads  */
 464         if (priv->proto_version == ALPS_PROTO_V5) {
 465                 for (i = 0; i < 4; i++)
 466                         corner[i].x = priv->x_max - corner[i].x;
 467         }
 468
 469         /* y-bitmap order is reversed on v3 and v4 touchpads  */
 470         if (priv->proto_version == ALPS_PROTO_V3 ||
 471             priv->proto_version == ALPS_PROTO_V4) {
 472                 for (i = 0; i < 4; i++)
 473                         corner[i].y = priv->y_max - corner[i].y;
 474         }
 475
 476         /*
 477          * We only select a corner for the second touch once per 2 finger
 478          * touch sequence to avoid the chosen corner (and thus the coordinates)
 479          * jumping around when the first touch is in the middle.
 480          */
 481         if (priv->second_touch == -1) {
 482                 /* Find corner closest to our st coordinates */
 483                 closest = 0x7fffffff;
 484                 for (i = 0; i < 4; i++) {
 485                         int dx = fields->st.x - corner[i].x;
 486                         int dy = fields->st.y - corner[i].y;
 487                         int distance = dx * dx + dy * dy;
 488
 489                         if (distance < closest) {
 490                                 priv->second_touch = i;
 491                                 closest = distance;
 492                         }
 493                 }
 494                 /* And select the opposite corner to use for the 2nd touch */
 495                 priv->second_touch = (priv->second_touch + 2) % 4;
 496         }
 497
 498         fields->mt[0] = fields->st;
 499         fields->mt[1] = corner[priv->second_touch];
 500
 501         return fingers;
 502 }
 503
 504 static void alps_set_slot(struct input_dev *dev, int slot, int x, int y)
 505 {
 506         input_mt_slot(dev, slot);
 507         input_mt_report_slot_state(dev, MT_TOOL_FINGER, true);
 508         input_report_abs(dev, ABS_MT_POSITION_X, x);
 509         input_report_abs(dev, ABS_MT_POSITION_Y, y);
 510 }
 511
 512 static void alps_report_mt_data(struct psmouse *psmouse, int n)
 513 {
 514         struct alps_data *priv = psmouse->private;
 515         struct input_dev *dev = psmouse->dev;
 516         struct alps_fields *f = &priv->f;
 517         int i, slot[MAX_TOUCHES];
 518
 519         input_mt_assign_slots(dev, slot, f->mt, n, 0);
 520         for (i = 0; i < n; i++)
 521                 alps_set_slot(dev, slot[i], f->mt[i].x, f->mt[i].y);
 522
 523         input_mt_sync_frame(dev);
 524 }
 525
 526 static void alps_report_semi_mt_data(struct psmouse *psmouse, int fingers)
 527 {
 528         struct alps_data *priv = psmouse->private;
 529         struct input_dev *dev = psmouse->dev;
 530         struct alps_fields *f = &priv->f;
 531
 532         /* Use st data when we don't have mt data */
 533         if (fingers < 2) {
 534                 f->mt[0].x = f->st.x;
 535                 f->mt[0].y = f->st.y;
 536                 fingers = f->pressure > 0 ? 1 : 0;
 537                 priv->second_touch = -1;
 538         }
 539
 540         if (fingers >= 1)
 541                 alps_set_slot(dev, 0, f->mt[0].x, f->mt[0].y);
 542         if (fingers >= 2)
 543                 alps_set_slot(dev, 1, f->mt[1].x, f->mt[1].y);
 544         input_mt_sync_frame(dev);
 545
 546         input_mt_report_finger_count(dev, fingers);
 547
 548         input_report_key(dev, BTN_LEFT, f->left);
 549         input_report_key(dev, BTN_RIGHT, f->right);
 550         input_report_key(dev, BTN_MIDDLE, f->middle);
 551
 552         input_report_abs(dev, ABS_PRESSURE, f->pressure);
 553
 554         input_sync(dev);
 555 }
 556
 557 static void alps_process_trackstick_packet_v3(struct psmouse *psmouse)
 558 {
 559         struct alps_data *priv = psmouse->private;
 560         unsigned char *packet = psmouse->packet;
 561         struct input_dev *dev = priv->dev2;
 562         int x, y, z, left, right, middle;
 563
 564         /* It should be a DualPoint when received trackstick packet */
 565         if (!(priv->flags & ALPS_DUALPOINT)) {
 566                 psmouse_warn(psmouse,
 567                              "Rejected trackstick packet from non DualPoint device");
 568                 return;
 569         }
 570
 571         /* Sanity check packet */
 572         if (!(packet[0] & 0x40)) {
 573                 psmouse_dbg(psmouse, "Bad trackstick packet, discarding\n");
 574                 return;
 575         }
 576
 577         /*
 578          * There's a special packet that seems to indicate the end
 579          * of a stream of trackstick data. Filter these out.
 580          */
 581         if (packet[1] == 0x7f && packet[2] == 0x7f && packet[4] == 0x7f)
 582                 return;
 583
 584         x = (s8)(((packet[0] & 0x20) << 2) | (packet[1] & 0x7f));
 585         y = (s8)(((packet[0] & 0x10) << 3) | (packet[2] & 0x7f));
 586         z = packet[4] & 0x7f;
 587
 588         /*
 589          * The x and y values tend to be quite large, and when used
 590          * alone the trackstick is difficult to use. Scale them down
 591          * to compensate.
 592          */
 593         x /= 8;
 594         y /= 8;
 595
 596         input_report_rel(dev, REL_X, x);
 597         input_report_rel(dev, REL_Y, -y);
 598         input_report_abs(dev, ABS_PRESSURE, z);
 599
 600         /*
 601          * Most ALPS models report the trackstick buttons in the touchpad
 602          * packets, but a few report them here. No reliable way has been
 603          * found to differentiate between the models upfront, so we enable
 604          * the quirk in response to seeing a button press in the trackstick
 605          * packet.
 606          */
 607         left = packet[3] & 0x01;
 608         right = packet[3] & 0x02;
 609         middle = packet[3] & 0x04;
 610
 611         if (!(priv->quirks & ALPS_QUIRK_TRACKSTICK_BUTTONS) &&
 612             (left || right || middle))
 613                 priv->quirks |= ALPS_QUIRK_TRACKSTICK_BUTTONS;
 614
 615         if (priv->quirks & ALPS_QUIRK_TRACKSTICK_BUTTONS) {
 616                 input_report_key(dev, BTN_LEFT, left);
 617                 input_report_key(dev, BTN_RIGHT, right);
 618                 input_report_key(dev, BTN_MIDDLE, middle);
 619         }
 620
 621         input_sync(dev);
 622         return;
 623 }
 624
 625 static void alps_decode_buttons_v3(struct alps_fields *f, unsigned char *p)
 626 {
 627         f->left = !!(p[3] & 0x01);
 628         f->right = !!(p[3] & 0x02);
 629         f->middle = !!(p[3] & 0x04);
 630
 631         f->ts_left = !!(p[3] & 0x10);
 632         f->ts_right = !!(p[3] & 0x20);
 633         f->ts_middle = !!(p[3] & 0x40);
 634 }
 635
 636 static int alps_decode_pinnacle(struct alps_fields *f, unsigned char *p,
 637                                  struct psmouse *psmouse)
 638 {
 639         f->first_mp = !!(p[4] & 0x40);
 640         f->is_mp = !!(p[0] & 0x40);
 641
 642         if (f->is_mp) {
 643                 f->fingers = (p[5] & 0x3) + 1;
 644                 f->x_map = ((p[4] & 0x7e) << 8) |
 645                            ((p[1] & 0x7f) << 2) |
 646                            ((p[0] & 0x30) >> 4);
 647                 f->y_map = ((p[3] & 0x70) << 4) |
 648                            ((p[2] & 0x7f) << 1) |
 649                            (p[4] & 0x01);
 650         } else {
 651                 f->st.x = ((p[1] & 0x7f) << 4) | ((p[4] & 0x30) >> 2) |
 652                        ((p[0] & 0x30) >> 4);
 653                 f->st.y = ((p[2] & 0x7f) << 4) | (p[4] & 0x0f);
 654                 f->pressure = p[5] & 0x7f;
 655
 656                 alps_decode_buttons_v3(f, p);
 657         }
 658
 659         return 0;
 660 }
 661
 662 static int alps_decode_rushmore(struct alps_fields *f, unsigned char *p,
 663                                  struct psmouse *psmouse)
 664 {
 665         f->first_mp = !!(p[4] & 0x40);
 666         f->is_mp = !!(p[5] & 0x40);
 667
 668         if (f->is_mp) {
 669                 f->fingers = max((p[5] & 0x3), ((p[5] >> 2) & 0x3)) + 1;
 670                 f->x_map = ((p[5] & 0x10) << 11) |
 671                            ((p[4] & 0x7e) << 8) |
 672                            ((p[1] & 0x7f) << 2) |
 673                            ((p[0] & 0x30) >> 4);
 674                 f->y_map = ((p[5] & 0x20) << 6) |
 675                            ((p[3] & 0x70) << 4) |
 676                            ((p[2] & 0x7f) << 1) |
 677                            (p[4] & 0x01);
 678         } else {
 679                 f->st.x = ((p[1] & 0x7f) << 4) | ((p[4] & 0x30) >> 2) |
 680                        ((p[0] & 0x30) >> 4);
 681                 f->st.y = ((p[2] & 0x7f) << 4) | (p[4] & 0x0f);
 682                 f->pressure = p[5] & 0x7f;
 683
 684                 alps_decode_buttons_v3(f, p);
 685         }
 686
 687         return 0;
 688 }
 689
 690 static int alps_decode_dolphin(struct alps_fields *f, unsigned char *p,
 691                                 struct psmouse *psmouse)
 692 {
 693         u64 palm_data = 0;
 694         struct alps_data *priv = psmouse->private;
 695
 696         f->first_mp = !!(p[0] & 0x02);
 697         f->is_mp = !!(p[0] & 0x20);
 698
 699         if (!f->is_mp) {
 700                 f->st.x = ((p[1] & 0x7f) | ((p[4] & 0x0f) << 7));
 701                 f->st.y = ((p[2] & 0x7f) | ((p[4] & 0xf0) << 3));
 702                 f->pressure = (p[0] & 4) ? 0 : p[5] & 0x7f;
 703                 alps_decode_buttons_v3(f, p);
 704         } else {
 705                 f->fingers = ((p[0] & 0x6) >> 1 |
 706                      (p[0] & 0x10) >> 2);
 707
 708                 palm_data = (p[1] & 0x7f) |
 709                             ((p[2] & 0x7f) << 7) |
 710                             ((p[4] & 0x7f) << 14) |
 711                             ((p[5] & 0x7f) << 21) |
 712                             ((p[3] & 0x07) << 28) |
 713                             (((u64)p[3] & 0x70) << 27) |
 714                             (((u64)p[0] & 0x01) << 34);
 715
 716                 /* Y-profile is stored in P(0) to p(n-1), n = y_bits; */
 717                 f->y_map = palm_data & (BIT(priv->y_bits) - 1);
 718
 719                 /* X-profile is stored in p(n) to p(n+m-1), m = x_bits; */
 720                 f->x_map = (palm_data >> priv->y_bits) &
 721                            (BIT(priv->x_bits) - 1);
 722         }
 723
 724         return 0;
 725 }
 726
 727 static void alps_process_touchpad_packet_v3_v5(struct psmouse *psmouse)
 728 {
 729         struct alps_data *priv = psmouse->private;
 730         unsigned char *packet = psmouse->packet;
 731         struct input_dev *dev2 = priv->dev2;
 732         struct alps_fields *f = &priv->f;
 733         int fingers = 0;
 734
 735         memset(f, 0, sizeof(*f));
 736
 737         priv->decode_fields(f, packet, psmouse);
 738
 739         /*
 740          * There's no single feature of touchpad position and bitmap packets
 741          * that can be used to distinguish between them. We rely on the fact
 742          * that a bitmap packet should always follow a position packet with
 743          * bit 6 of packet[4] set.
 744          */
 745         if (priv->multi_packet) {
 746                 /*
 747                  * Sometimes a position packet will indicate a multi-packet
 748                  * sequence, but then what follows is another position
 749                  * packet. Check for this, and when it happens process the
 750                  * position packet as usual.
 751                  */
 752                 if (f->is_mp) {
 753                         fingers = f->fingers;
 754                         /*
 755                          * Bitmap processing uses position packet's coordinate
 756                          * data, so we need to do decode it first.
 757                          */
 758                         priv->decode_fields(f, priv->multi_data, psmouse);
 759                         if (alps_process_bitmap(priv, f) == 0)
 760                                 fingers = 0; /* Use st data */
 761                 } else {
 762                         priv->multi_packet = 0;
 763                 }
 764         }
 765
 766         /*
 767          * Bit 6 of byte 0 is not usually set in position packets. The only
 768          * times it seems to be set is in situations where the data is
 769          * suspect anyway, e.g. a palm resting flat on the touchpad. Given
 770          * this combined with the fact that this bit is useful for filtering
 771          * out misidentified bitmap packets, we reject anything with this
 772          * bit set.
 773          */
 774         if (f->is_mp)
 775                 return;
 776
 777         if (!priv->multi_packet && f->first_mp) {
 778                 priv->multi_packet = 1;
 779                 memcpy(priv->multi_data, packet, sizeof(priv->multi_data));
 780                 return;
 781         }
 782
 783         priv->multi_packet = 0;
 784
 785         /*
 786          * Sometimes the hardware sends a single packet with z = 0
 787          * in the middle of a stream. Real releases generate packets
 788          * with x, y, and z all zero, so these seem to be flukes.
 789          * Ignore them.
 790          */
 791         if (f->st.x && f->st.y && !f->pressure)
 792                 return;
 793
 794         alps_report_semi_mt_data(psmouse, fingers);
 795
 796         if ((priv->flags & ALPS_DUALPOINT) &&
 797             !(priv->quirks & ALPS_QUIRK_TRACKSTICK_BUTTONS)) {
 798                 input_report_key(dev2, BTN_LEFT, f->ts_left);
 799                 input_report_key(dev2, BTN_RIGHT, f->ts_right);
 800                 input_report_key(dev2, BTN_MIDDLE, f->ts_middle);
 801                 input_sync(dev2);
 802         }
 803 }
 804
 805 static void alps_process_packet_v3(struct psmouse *psmouse)
 806 {
 807         unsigned char *packet = psmouse->packet;
 808
 809         /*
 810          * v3 protocol packets come in three types, two representing
 811          * touchpad data and one representing trackstick data.
 812          * Trackstick packets seem to be distinguished by always
 813          * having 0x3f in the last byte. This value has never been
 814          * observed in the last byte of either of the other types
 815          * of packets.
 816          */
 817         if (packet[5] == 0x3f) {
 818                 alps_process_trackstick_packet_v3(psmouse);
 819                 return;
 820         }
 821
 822         alps_process_touchpad_packet_v3_v5(psmouse);
 823 }
 824
 825 static void alps_process_packet_v6(struct psmouse *psmouse)
 826 {
 827         struct alps_data *priv = psmouse->private;
 828         unsigned char *packet = psmouse->packet;
 829         struct input_dev *dev = psmouse->dev;
 830         struct input_dev *dev2 = priv->dev2;
 831         int x, y, z;
 832
 833         /*
 834          * We can use Byte5 to distinguish if the packet is from Touchpad
 835          * or Trackpoint.
 836          * Touchpad:    0 - 0x7E
 837          * Trackpoint:  0x7F
 838          */
 839         if (packet[5] == 0x7F) {
 840                 /* It should be a DualPoint when received Trackpoint packet */
 841                 if (!(priv->flags & ALPS_DUALPOINT)) {
 842                         psmouse_warn(psmouse,
 843                                      "Rejected trackstick packet from non DualPoint device");
 844                         return;
 845                 }
 846
 847                 /* Trackpoint packet */
 848                 x = packet[1] | ((packet[3] & 0x20) << 2);
 849                 y = packet[2] | ((packet[3] & 0x40) << 1);
 850                 z = packet[4];
 851
 852                 /* To prevent the cursor jump when finger lifted */
 853                 if (x == 0x7F && y == 0x7F && z == 0x7F)
 854                         x = y = z = 0;
 855
 856                 /* Divide 4 since trackpoint's speed is too fast */
 857                 input_report_rel(dev2, REL_X, (char)x / 4);
 858                 input_report_rel(dev2, REL_Y, -((char)y / 4));
 859
 860                 psmouse_report_standard_buttons(dev2, packet[3]);
 861
 862                 input_sync(dev2);
 863                 return;
 864         }
 865
 866         /* Touchpad packet */
 867         x = packet[1] | ((packet[3] & 0x78) << 4);
 868         y = packet[2] | ((packet[4] & 0x78) << 4);
 869         z = packet[5];
 870
 871         if (z > 30)
 872                 input_report_key(dev, BTN_TOUCH, 1);
 873         if (z < 25)
 874                 input_report_key(dev, BTN_TOUCH, 0);
 875
 876         if (z > 0) {
 877                 input_report_abs(dev, ABS_X, x);
 878                 input_report_abs(dev, ABS_Y, y);
 879         }
 880
 881         input_report_abs(dev, ABS_PRESSURE, z);
 882         input_report_key(dev, BTN_TOOL_FINGER, z > 0);
 883
 884         /* v6 touchpad does not have middle button */
 885         packet[3] &= ~BIT(2);
 886         psmouse_report_standard_buttons(dev2, packet[3]);
 887
 888         input_sync(dev);
 889 }
 890
 891 static void alps_process_packet_v4(struct psmouse *psmouse)
 892 {
 893         struct alps_data *priv = psmouse->private;
 894         unsigned char *packet = psmouse->packet;
 895         struct alps_fields *f = &priv->f;
 896         int offset;
 897
 898         /*
 899          * v4 has a 6-byte encoding for bitmap data, but this data is
 900          * broken up between 3 normal packets. Use priv->multi_packet to
 901          * track our position in the bitmap packet.
 902          */
 903         if (packet[6] & 0x40) {
 904                 /* sync, reset position */
 905                 priv->multi_packet = 0;
 906         }
 907
 908         if (WARN_ON_ONCE(priv->multi_packet > 2))
 909                 return;
 910
 911         offset = 2 * priv->multi_packet;
 912         priv->multi_data[offset] = packet[6];
 913         priv->multi_data[offset + 1] = packet[7];
 914
 915         f->left = !!(packet[4] & 0x01);
 916         f->right = !!(packet[4] & 0x02);
 917
 918         f->st.x = ((packet[1] & 0x7f) << 4) | ((packet[3] & 0x30) >> 2) |
 919                   ((packet[0] & 0x30) >> 4);
 920         f->st.y = ((packet[2] & 0x7f) << 4) | (packet[3] & 0x0f);
 921         f->pressure = packet[5] & 0x7f;
 922
 923         if (++priv->multi_packet > 2) {
 924                 priv->multi_packet = 0;
 925
 926                 f->x_map = ((priv->multi_data[2] & 0x1f) << 10) |
 927                            ((priv->multi_data[3] & 0x60) << 3) |
 928                            ((priv->multi_data[0] & 0x3f) << 2) |
 929                            ((priv->multi_data[1] & 0x60) >> 5);
 930                 f->y_map = ((priv->multi_data[5] & 0x01) << 10) |
 931                            ((priv->multi_data[3] & 0x1f) << 5) |
 932                             (priv->multi_data[1] & 0x1f);
 933
 934                 f->fingers = alps_process_bitmap(priv, f);
 935         }
 936
 937         alps_report_semi_mt_data(psmouse, f->fingers);
 938 }
 939
 940 static bool alps_is_valid_package_v7(struct psmouse *psmouse)
 941 {
 942         switch (psmouse->pktcnt) {
 943         case 3:
 944                 return (psmouse->packet[2] & 0x40) == 0x40;
 945         case 4:
 946                 return (psmouse->packet[3] & 0x48) == 0x48;
 947         case 6:
 948                 return (psmouse->packet[5] & 0x40) == 0x00;
 949         }
 950         return true;
 951 }
 952
 953 static unsigned char alps_get_packet_id_v7(char *byte)
 954 {
 955         unsigned char packet_id;
 956
 957         if (byte[4] & 0x40)
 958                 packet_id = V7_PACKET_ID_TWO;
 959         else if (byte[4] & 0x01)
 960                 packet_id = V7_PACKET_ID_MULTI;
 961         else if ((byte[0] & 0x10) && !(byte[4] & 0x43))
 962                 packet_id = V7_PACKET_ID_NEW;
 963         else if (byte[1] == 0x00 && byte[4] == 0x00)
 964                 packet_id = V7_PACKET_ID_IDLE;
 965         else
 966                 packet_id = V7_PACKET_ID_UNKNOWN;
 967
 968         return packet_id;
 969 }
 970
 971 static void alps_get_finger_coordinate_v7(struct input_mt_pos *mt,
 972                                           unsigned char *pkt,
 973                                           unsigned char pkt_id)
 974 {
 975         mt[0].x = ((pkt[2] & 0x80) << 4);
 976         mt[0].x |= ((pkt[2] & 0x3F) << 5);
 977         mt[0].x |= ((pkt[3] & 0x30) >> 1);
 978         mt[0].x |= (pkt[3] & 0x07);
 979         mt[0].y = (pkt[1] << 3) | (pkt[0] & 0x07);
 980
 981         mt[1].x = ((pkt[3] & 0x80) << 4);
 982         mt[1].x |= ((pkt[4] & 0x80) << 3);
 983         mt[1].x |= ((pkt[4] & 0x3F) << 4);
 984         mt[1].y = ((pkt[5] & 0x80) << 3);
 985         mt[1].y |= ((pkt[5] & 0x3F) << 4);
 986
 987         switch (pkt_id) {
 988         case V7_PACKET_ID_TWO:
 989                 mt[1].x &= ~0x000F;
 990                 mt[1].y |= 0x000F;
 991                 /* Detect false-postive touches where x & y report max value */
 992                 if (mt[1].y == 0x7ff && mt[1].x == 0xff0) {
 993                         mt[1].x = 0;
 994                         /* y gets set to 0 at the end of this function */
 995                 }
 996                 break;
 997
 998         case V7_PACKET_ID_MULTI:
 999                 mt[1].x &= ~0x003F;
1000                 mt[1].y &= ~0x0020;
1001                 mt[1].y |= ((pkt[4] & 0x02) << 4);
1002                 mt[1].y |= 0x001F;
1003                 break;
1004
1005         case V7_PACKET_ID_NEW:
1006                 mt[1].x &= ~0x003F;
1007                 mt[1].x |= (pkt[0] & 0x20);
1008                 mt[1].y |= 0x000F;
1009                 break;
1010         }
1011
1012         mt[0].y = 0x7FF - mt[0].y;
1013         mt[1].y = 0x7FF - mt[1].y;
1014 }
1015
1016 static int alps_get_mt_count(struct input_mt_pos *mt)
1017 {
1018         int i, fingers = 0;
1019
1020         for (i = 0; i < MAX_TOUCHES; i++) {
1021                 if (mt[i].x != 0 || mt[i].y != 0)
1022                         fingers++;
1023         }
1024
1025         return fingers;
1026 }
1027
1028 static int alps_decode_packet_v7(struct alps_fields *f,
1029                                   unsigned char *p,
1030                                   struct psmouse *psmouse)
1031 {
1032         struct alps_data *priv = psmouse->private;
1033         unsigned char pkt_id;
1034
1035         pkt_id = alps_get_packet_id_v7(p);
1036         if (pkt_id == V7_PACKET_ID_IDLE)
1037                 return 0;
1038         if (pkt_id == V7_PACKET_ID_UNKNOWN)
1039                 return -1;
1040         /*
1041          * NEW packets are send to indicate a discontinuity in the finger
1042          * coordinate reporting. Specifically a finger may have moved from
1043          * slot 0 to 1 or vice versa. INPUT_MT_TRACK takes care of this for
1044          * us.
1045          *
1046          * NEW packets have 3 problems:
1047          * 1) They do not contain middle / right button info (on non clickpads)
1048          *    this can be worked around by preserving the old button state
1049          * 2) They do not contain an accurate fingercount, and they are
1050          *    typically send when the number of fingers changes. We cannot use
1051          *    the old finger count as that may mismatch with the amount of
1052          *    touch coordinates we've available in the NEW packet
1053          * 3) Their x data for the second touch is inaccurate leading to
1054          *    a possible jump of the x coordinate by 16 units when the first
1055          *    non NEW packet comes in
1056          * Since problems 2 & 3 cannot be worked around, just ignore them.
1057          */
1058         if (pkt_id == V7_PACKET_ID_NEW)
1059                 return 1;
1060
1061         alps_get_finger_coordinate_v7(f->mt, p, pkt_id);
1062
1063         if (pkt_id == V7_PACKET_ID_TWO)
1064                 f->fingers = alps_get_mt_count(f->mt);
1065         else /* pkt_id == V7_PACKET_ID_MULTI */
1066                 f->fingers = 3 + (p[5] & 0x03);
1067
1068         f->left = (p[0] & 0x80) >> 7;
1069         if (priv->flags & ALPS_BUTTONPAD) {
1070                 if (p[0] & 0x20)
1071                         f->fingers++;
1072                 if (p[0] & 0x10)
1073                         f->fingers++;
1074         } else {
1075                 f->right = (p[0] & 0x20) >> 5;
1076                 f->middle = (p[0] & 0x10) >> 4;
1077         }
1078
1079         /* Sometimes a single touch is reported in mt[1] rather then mt[0] */
1080         if (f->fingers == 1 && f->mt[0].x == 0 && f->mt[0].y == 0) {
1081                 f->mt[0].x = f->mt[1].x;
1082                 f->mt[0].y = f->mt[1].y;
1083                 f->mt[1].x = 0;
1084                 f->mt[1].y = 0;
1085         }
1086
1087         return 0;
1088 }
1089
1090 static void alps_process_trackstick_packet_v7(struct psmouse *psmouse)
1091 {
1092         struct alps_data *priv = psmouse->private;
1093         unsigned char *packet = psmouse->packet;
1094         struct input_dev *dev2 = priv->dev2;
1095         int x, y, z;
1096
1097         /* It should be a DualPoint when received trackstick packet */
1098         if (!(priv->flags & ALPS_DUALPOINT)) {
1099                 psmouse_warn(psmouse,
1100                              "Rejected trackstick packet from non DualPoint device");
1101                 return;
1102         }
1103
1104         x = ((packet[2] & 0xbf)) | ((packet[3] & 0x10) << 2);
1105         y = (packet[3] & 0x07) | (packet[4] & 0xb8) |
1106             ((packet[3] & 0x20) << 1);
1107         z = (packet[5] & 0x3f) | ((packet[3] & 0x80) >> 1);
1108
1109         input_report_rel(dev2, REL_X, (char)x);
1110         input_report_rel(dev2, REL_Y, -((char)y));
1111         input_report_abs(dev2, ABS_PRESSURE, z);
1112
1113         psmouse_report_standard_buttons(dev2, packet[1]);
1114
1115         input_sync(dev2);
1116 }
1117
1118 static void alps_process_touchpad_packet_v7(struct psmouse *psmouse)
1119 {
1120         struct alps_data *priv = psmouse->private;
1121         struct input_dev *dev = psmouse->dev;
1122         struct alps_fields *f = &priv->f;
1123
1124         memset(f, 0, sizeof(*f));
1125
1126         if (priv->decode_fields(f, psmouse->packet, psmouse))
1127                 return;
1128
1129         alps_report_mt_data(psmouse, alps_get_mt_count(f->mt));
1130
1131         input_mt_report_finger_count(dev, f->fingers);
1132
1133         input_report_key(dev, BTN_LEFT, f->left);
1134         input_report_key(dev, BTN_RIGHT, f->right);
1135         input_report_key(dev, BTN_MIDDLE, f->middle);
1136
1137         input_sync(dev);
1138 }
1139
1140 static void alps_process_packet_v7(struct psmouse *psmouse)
1141 {
1142         unsigned char *packet = psmouse->packet;
1143
1144         if (packet[0] == 0x48 && (packet[4] & 0x47) == 0x06)
1145                 alps_process_trackstick_packet_v7(psmouse);
1146         else
1147                 alps_process_touchpad_packet_v7(psmouse);
1148 }
1149
1150 static enum SS4_PACKET_ID alps_get_pkt_id_ss4_v2(unsigned char *byte)
1151 {
1152         enum SS4_PACKET_ID pkt_id = SS4_PACKET_ID_IDLE;
1153
1154         switch (byte[3] & 0x30) {
1155         case 0x00:
1156                 if (SS4_IS_IDLE_V2(byte)) {
1157                         pkt_id = SS4_PACKET_ID_IDLE;
1158                 } else {
1159                         pkt_id = SS4_PACKET_ID_ONE;
1160                 }
1161                 break;
1162         case 0x10:
1163                 /* two-finger finger positions */
1164                 pkt_id = SS4_PACKET_ID_TWO;
1165                 break;
1166         case 0x20:
1167                 /* stick pointer */
1168                 pkt_id = SS4_PACKET_ID_STICK;
1169                 break;
1170         case 0x30:
1171                 /* third and fourth finger positions */
1172                 pkt_id = SS4_PACKET_ID_MULTI;
1173                 break;
1174         }
1175
1176         return pkt_id;
1177 }
1178
1179 static int alps_decode_ss4_v2(struct alps_fields *f,
1180                               unsigned char *p, struct psmouse *psmouse)
1181 {
1182         struct alps_data *priv = psmouse->private;
1183         enum SS4_PACKET_ID pkt_id;
1184         unsigned int no_data_x, no_data_y;
1185
1186         pkt_id = alps_get_pkt_id_ss4_v2(p);
1187
1188         /* Current packet is 1Finger coordinate packet */
1189         switch (pkt_id) {
1190         case SS4_PACKET_ID_ONE:
1191                 f->mt[0].x = SS4_1F_X_V2(p);
1192                 f->mt[0].y = SS4_1F_Y_V2(p);
1193                 f->pressure = ((SS4_1F_Z_V2(p)) * 2) & 0x7f;
1194                 /*
1195                  * When a button is held the device will give us events
1196                  * with x, y, and pressure of 0. This causes annoying jumps
1197                  * if a touch is released while the button is held.
1198                  * Handle this by claiming zero contacts.
1199                  */
1200                 f->fingers = f->pressure > 0 ? 1 : 0;
1201                 f->first_mp = 0;
1202                 f->is_mp = 0;
1203                 break;
1204
1205         case SS4_PACKET_ID_TWO:
1206                 if (priv->flags & ALPS_BUTTONPAD) {
1207                         if (IS_SS4PLUS_DEV(priv->dev_id)) {
1208                                 f->mt[0].x = SS4_PLUS_BTL_MF_X_V2(p, 0);
1209                                 f->mt[1].x = SS4_PLUS_BTL_MF_X_V2(p, 1);
1210                         } else {
1211                                 f->mt[0].x = SS4_BTL_MF_X_V2(p, 0);
1212                                 f->mt[1].x = SS4_BTL_MF_X_V2(p, 1);
1213                         }
1214                         f->mt[0].y = SS4_BTL_MF_Y_V2(p, 0);
1215                         f->mt[1].y = SS4_BTL_MF_Y_V2(p, 1);
1216                 } else {
1217                         if (IS_SS4PLUS_DEV(priv->dev_id)) {
1218                                 f->mt[0].x = SS4_PLUS_STD_MF_X_V2(p, 0);
1219                                 f->mt[1].x = SS4_PLUS_STD_MF_X_V2(p, 1);
1220                         } else {
1221                                 f->mt[0].x = SS4_STD_MF_X_V2(p, 0);
1222                                 f->mt[1].x = SS4_STD_MF_X_V2(p, 1);
1223                         }
1224                         f->mt[0].y = SS4_STD_MF_Y_V2(p, 0);
1225                         f->mt[1].y = SS4_STD_MF_Y_V2(p, 1);
1226                 }
1227                 f->pressure = SS4_MF_Z_V2(p, 0) ? 0x30 : 0;
1228
1229                 if (SS4_IS_MF_CONTINUE(p)) {
1230                         f->first_mp = 1;
1231                 } else {
1232                         f->fingers = 2;
1233                         f->first_mp = 0;
1234                 }
1235                 f->is_mp = 0;
1236
1237                 break;
1238
1239         case SS4_PACKET_ID_MULTI:
1240                 if (priv->flags & ALPS_BUTTONPAD) {
1241                         if (IS_SS4PLUS_DEV(priv->dev_id)) {
1242                                 f->mt[2].x = SS4_PLUS_BTL_MF_X_V2(p, 0);
1243                                 f->mt[3].x = SS4_PLUS_BTL_MF_X_V2(p, 1);
1244                                 no_data_x = SS4_PLUS_MFPACKET_NO_AX_BL;
1245                         } else {
1246                                 f->mt[2].x = SS4_BTL_MF_X_V2(p, 0);
1247                                 f->mt[3].x = SS4_BTL_MF_X_V2(p, 1);
1248                                 no_data_x = SS4_MFPACKET_NO_AX_BL;
1249                         }
1250                         no_data_y = SS4_MFPACKET_NO_AY_BL;
1251
1252                         f->mt[2].y = SS4_BTL_MF_Y_V2(p, 0);
1253                         f->mt[3].y = SS4_BTL_MF_Y_V2(p, 1);
1254                 } else {
1255                         if (IS_SS4PLUS_DEV(priv->dev_id)) {
1256                                 f->mt[2].x = SS4_PLUS_STD_MF_X_V2(p, 0);
1257                                 f->mt[3].x = SS4_PLUS_STD_MF_X_V2(p, 1);
1258                                 no_data_x = SS4_PLUS_MFPACKET_NO_AX;
1259                         } else {
1260                                 f->mt[2].x = SS4_STD_MF_X_V2(p, 0);
1261                                 f->mt[3].x = SS4_STD_MF_X_V2(p, 1);
1262                                 no_data_x = SS4_MFPACKET_NO_AX;
1263                         }
1264                         no_data_y = SS4_MFPACKET_NO_AY;
1265
1266                         f->mt[2].y = SS4_STD_MF_Y_V2(p, 0);
1267                         f->mt[3].y = SS4_STD_MF_Y_V2(p, 1);
1268                 }
1269
1270                 f->first_mp = 0;
1271                 f->is_mp = 1;
1272
1273                 if (SS4_IS_5F_DETECTED(p)) {
1274                         f->fingers = 5;
1275                 } else if (f->mt[3].x == no_data_x &&
1276                              f->mt[3].y == no_data_y) {
1277                         f->mt[3].x = 0;
1278                         f->mt[3].y = 0;
1279                         f->fingers = 3;
1280                 } else {
1281                         f->fingers = 4;
1282                 }
1283                 break;
1284
1285         case SS4_PACKET_ID_STICK:
1286                 /*
1287                  * x, y, and pressure are decoded in
1288                  * alps_process_packet_ss4_v2()
1289                  */
1290                 f->first_mp = 0;
1291                 f->is_mp = 0;
1292                 break;
1293
1294         case SS4_PACKET_ID_IDLE:
1295         default:
1296                 memset(f, 0, sizeof(struct alps_fields));
1297                 break;
1298         }
1299
1300         /* handle buttons */
1301         if (pkt_id == SS4_PACKET_ID_STICK) {
1302                 f->ts_left = !!(SS4_BTN_V2(p) & 0x01);
1303                 f->ts_right = !!(SS4_BTN_V2(p) & 0x02);
1304                 f->ts_middle = !!(SS4_BTN_V2(p) & 0x04);
1305         } else {
1306                 f->left = !!(SS4_BTN_V2(p) & 0x01);
1307                 if (!(priv->flags & ALPS_BUTTONPAD)) {
1308                         f->right = !!(SS4_BTN_V2(p) & 0x02);
1309                         f->middle = !!(SS4_BTN_V2(p) & 0x04);
1310                 }
1311         }
1312
1313         return 0;
1314 }
1315
1316 static void alps_process_packet_ss4_v2(struct psmouse *psmouse)
1317 {
1318         struct alps_data *priv = psmouse->private;
1319         unsigned char *packet = psmouse->packet;
1320         struct input_dev *dev = psmouse->dev;
1321         struct input_dev *dev2 = priv->dev2;
1322         struct alps_fields *f = &priv->f;
1323
1324         memset(f, 0, sizeof(struct alps_fields));
1325         priv->decode_fields(f, packet, psmouse);
1326         if (priv->multi_packet) {
1327                 /*
1328                  * Sometimes the first packet will indicate a multi-packet
1329                  * sequence, but sometimes the next multi-packet would not
1330                  * come. Check for this, and when it happens process the
1331                  * position packet as usual.
1332                  */
1333                 if (f->is_mp) {
1334                         /* Now process the 1st packet */
1335                         priv->decode_fields(f, priv->multi_data, psmouse);
1336                 } else {
1337                         priv->multi_packet = 0;
1338                 }
1339         }
1340
1341         /*
1342          * "f.is_mp" would always be '0' after merging the 1st and 2nd packet.
1343          * When it is set, it means 2nd packet comes without 1st packet come.
1344          */
1345         if (f->is_mp)
1346                 return;
1347
1348         /* Save the first packet */
1349         if (!priv->multi_packet && f->first_mp) {
1350                 priv->multi_packet = 1;
1351                 memcpy(priv->multi_data, packet, sizeof(priv->multi_data));
1352                 return;
1353         }
1354
1355         priv->multi_packet = 0;
1356
1357         /* Report trackstick */
1358         if (alps_get_pkt_id_ss4_v2(packet) == SS4_PACKET_ID_STICK) {
1359                 if (!(priv->flags & ALPS_DUALPOINT)) {
1360                         psmouse_warn(psmouse,
1361                                      "Rejected trackstick packet from non DualPoint device");
1362                         return;
1363                 }
1364
1365                 input_report_rel(dev2, REL_X, SS4_TS_X_V2(packet));
1366                 input_report_rel(dev2, REL_Y, SS4_TS_Y_V2(packet));
1367                 input_report_abs(dev2, ABS_PRESSURE, SS4_TS_Z_V2(packet));
1368
1369                 input_report_key(dev2, BTN_LEFT, f->ts_left);
1370                 input_report_key(dev2, BTN_RIGHT, f->ts_right);
1371                 input_report_key(dev2, BTN_MIDDLE, f->ts_middle);
1372
1373                 input_sync(dev2);
1374                 return;
1375         }
1376
1377         /* Report touchpad */
1378         alps_report_mt_data(psmouse, (f->fingers <= 4) ? f->fingers : 4);
1379
1380         input_mt_report_finger_count(dev, f->fingers);
1381
1382         input_report_key(dev, BTN_LEFT, f->left);
1383         input_report_key(dev, BTN_RIGHT, f->right);
1384         input_report_key(dev, BTN_MIDDLE, f->middle);
1385
1386         input_report_abs(dev, ABS_PRESSURE, f->pressure);
1387         input_sync(dev);
1388 }
1389
1390 static bool alps_is_valid_package_ss4_v2(struct psmouse *psmouse)
1391 {
1392         if (psmouse->pktcnt == 4 && ((psmouse->packet[3] & 0x08) != 0x08))
1393                 return false;
1394         if (psmouse->pktcnt == 6 && ((psmouse->packet[5] & 0x10) != 0x0))
1395                 return false;
1396         return true;
1397 }
1398
1399 static DEFINE_MUTEX(alps_mutex);
1400
1401 static void alps_register_bare_ps2_mouse(struct work_struct *work)
1402 {
1403         struct alps_data *priv =
1404                 container_of(work, struct alps_data, dev3_register_work.work);
1405         struct psmouse *psmouse = priv->psmouse;
1406         struct input_dev *dev3;
1407         int error = 0;
1408
1409         mutex_lock(&alps_mutex);
1410
1411         if (priv->dev3)
1412                 goto out;
1413
1414         dev3 = input_allocate_device();
1415         if (!dev3) {
1416                 psmouse_err(psmouse, "failed to allocate secondary device\n");
1417                 error = -ENOMEM;
1418                 goto out;
1419         }
1420
1421         snprintf(priv->phys3, sizeof(priv->phys3), "%s/%s",
1422                  psmouse->ps2dev.serio->phys,
1423                  (priv->dev2 ? "input2" : "input1"));
1424         dev3->phys = priv->phys3;
1425
1426         /*
1427          * format of input device name is: "protocol vendor name"
1428          * see function psmouse_switch_protocol() in psmouse-base.c
1429          */
1430         dev3->name = "PS/2 ALPS Mouse";
1431
1432         dev3->id.bustype = BUS_I8042;
1433         dev3->id.vendor  = 0x0002;
1434         dev3->id.product = PSMOUSE_PS2;
1435         dev3->id.version = 0x0000;
1436         dev3->dev.parent = &psmouse->ps2dev.serio->dev;
1437
1438         input_set_capability(dev3, EV_REL, REL_X);
1439         input_set_capability(dev3, EV_REL, REL_Y);
1440         input_set_capability(dev3, EV_KEY, BTN_LEFT);
1441         input_set_capability(dev3, EV_KEY, BTN_RIGHT);
1442         input_set_capability(dev3, EV_KEY, BTN_MIDDLE);
1443
1444         __set_bit(INPUT_PROP_POINTER, dev3->propbit);
1445
1446         error = input_register_device(dev3);
1447         if (error) {
1448                 psmouse_err(psmouse,
1449                             "failed to register secondary device: %d\n",
1450                             error);
1451                 input_free_device(dev3);
1452                 goto out;
1453         }
1454
1455         priv->dev3 = dev3;
1456
1457 out:
1458         /*
1459          * Save the error code so that we can detect that we
1460          * already tried to create the device.
1461          */
1462         if (error)
1463                 priv->dev3 = ERR_PTR(error);
1464
1465         mutex_unlock(&alps_mutex);
1466 }
1467
1468 static void alps_report_bare_ps2_packet(struct psmouse *psmouse,
1469                                         unsigned char packet[],
1470                                         bool report_buttons)
1471 {
1472         struct alps_data *priv = psmouse->private;
1473         struct input_dev *dev, *dev2 = NULL;
1474
1475         /* Figure out which device to use to report the bare packet */
1476         if (priv->proto_version == ALPS_PROTO_V2 &&
1477             (priv->flags & ALPS_DUALPOINT)) {
1478                 /* On V2 devices the DualPoint Stick reports bare packets */
1479                 dev = priv->dev2;
1480                 dev2 = psmouse->dev;
1481         } else if (unlikely(IS_ERR_OR_NULL(priv->dev3))) {
1482                 /* Register dev3 mouse if we received PS/2 packet first time */
1483                 if (!IS_ERR(priv->dev3))
1484                         psmouse_queue_work(psmouse, &priv->dev3_register_work,
1485                                            0);
1486                 return;
1487         } else {
1488                 dev = priv->dev3;
1489         }
1490
1491         if (report_buttons)
1492                 alps_report_buttons(dev, dev2,
1493                                 packet[0] & 1, packet[0] & 2, packet[0] & 4);
1494
1495         psmouse_report_standard_motion(dev, packet);
1496
1497         input_sync(dev);
1498 }
1499
1500 static psmouse_ret_t alps_handle_interleaved_ps2(struct psmouse *psmouse)
1501 {
1502         struct alps_data *priv = psmouse->private;
1503
1504         if (psmouse->pktcnt < 6)
1505                 return PSMOUSE_GOOD_DATA;
1506
1507         if (psmouse->pktcnt == 6) {
1508                 /*
1509                  * Start a timer to flush the packet if it ends up last
1510                  * 6-byte packet in the stream. Timer needs to fire
1511                  * psmouse core times out itself. 20 ms should be enough
1512                  * to decide if we are getting more data or not.
1513                  */
1514                 mod_timer(&priv->timer, jiffies + msecs_to_jiffies(20));
1515                 return PSMOUSE_GOOD_DATA;
1516         }
1517
1518         del_timer(&priv->timer);
1519
1520         if (psmouse->packet[6] & 0x80) {
1521
1522                 /*
1523                  * Highest bit is set - that means we either had
1524                  * complete ALPS packet and this is start of the
1525                  * next packet or we got garbage.
1526                  */
1527
1528                 if (((psmouse->packet[3] |
1529                       psmouse->packet[4] |
1530                       psmouse->packet[5]) & 0x80) ||
1531                     (!alps_is_valid_first_byte(priv, psmouse->packet[6]))) {
1532                         psmouse_dbg(psmouse,
1533                                     "refusing packet %4ph (suspected interleaved ps/2)\n",
1534                                     psmouse->packet + 3);
1535                         return PSMOUSE_BAD_DATA;
1536                 }
1537
1538                 priv->process_packet(psmouse);
1539
1540                 /* Continue with the next packet */
1541                 psmouse->packet[0] = psmouse->packet[6];
1542                 psmouse->pktcnt = 1;
1543
1544         } else {
1545
1546                 /*
1547                  * High bit is 0 - that means that we indeed got a PS/2
1548                  * packet in the middle of ALPS packet.
1549                  *
1550                  * There is also possibility that we got 6-byte ALPS
1551                  * packet followed  by 3-byte packet from trackpoint. We
1552                  * can not distinguish between these 2 scenarios but
1553                  * because the latter is unlikely to happen in course of
1554                  * normal operation (user would need to press all
1555                  * buttons on the pad and start moving trackpoint
1556                  * without touching the pad surface) we assume former.
1557                  * Even if we are wrong the wost thing that would happen
1558                  * the cursor would jump but we should not get protocol
1559                  * de-synchronization.
1560                  */
1561
1562                 alps_report_bare_ps2_packet(psmouse, &psmouse->packet[3],
1563                                             false);
1564
1565                 /*
1566                  * Continue with the standard ALPS protocol handling,
1567                  * but make sure we won't process it as an interleaved
1568                  * packet again, which may happen if all buttons are
1569                  * pressed. To avoid this let's reset the 4th bit which
1570                  * is normally 1.
1571                  */
1572                 psmouse->packet[3] = psmouse->packet[6] & 0xf7;
1573                 psmouse->pktcnt = 4;
1574         }
1575
1576         return PSMOUSE_GOOD_DATA;
1577 }
1578
1579 static void alps_flush_packet(struct timer_list *t)
1580 {
1581         struct alps_data *priv = from_timer(priv, t, timer);
1582         struct psmouse *psmouse = priv->psmouse;
1583
1584         serio_pause_rx(psmouse->ps2dev.serio);
1585
1586         if (psmouse->pktcnt == psmouse->pktsize) {
1587
1588                 /*
1589                  * We did not any more data in reasonable amount of time.
1590                  * Validate the last 3 bytes and process as a standard
1591                  * ALPS packet.
1592                  */
1593                 if ((psmouse->packet[3] |
1594                      psmouse->packet[4] |
1595                      psmouse->packet[5]) & 0x80) {
1596                         psmouse_dbg(psmouse,
1597                                     "refusing packet %3ph (suspected interleaved ps/2)\n",
1598                                     psmouse->packet + 3);
1599                 } else {
1600                         priv->process_packet(psmouse);
1601                 }
1602                 psmouse->pktcnt = 0;
1603         }
1604
1605         serio_continue_rx(psmouse->ps2dev.serio);
1606 }
1607
1608 static psmouse_ret_t alps_process_byte(struct psmouse *psmouse)
1609 {
1610         struct alps_data *priv = psmouse->private;
1611
1612         /*
1613          * Check if we are dealing with a bare PS/2 packet, presumably from
1614          * a device connected to the external PS/2 port. Because bare PS/2
1615          * protocol does not have enough constant bits to self-synchronize
1616          * properly we only do this if the device is fully synchronized.
1617          * Can not distinguish V8's first byte from PS/2 packet's
1618          */
1619         if (priv->proto_version != ALPS_PROTO_V8 &&
1620             !psmouse->out_of_sync_cnt &&
1621             (psmouse->packet[0] & 0xc8) == 0x08) {
1622
1623                 if (psmouse->pktcnt == 3) {
1624                         alps_report_bare_ps2_packet(psmouse, psmouse->packet,
1625                                                     true);
1626                         return PSMOUSE_FULL_PACKET;
1627                 }
1628                 return PSMOUSE_GOOD_DATA;
1629         }
1630
1631         /* Check for PS/2 packet stuffed in the middle of ALPS packet. */
1632
1633         if ((priv->flags & ALPS_PS2_INTERLEAVED) &&
1634             psmouse->pktcnt >= 4 && (psmouse->packet[3] & 0x0f) == 0x0f) {
1635                 return alps_handle_interleaved_ps2(psmouse);
1636         }
1637
1638         if (!alps_is_valid_first_byte(priv, psmouse->packet[0])) {
1639                 psmouse_dbg(psmouse,
1640                             "refusing packet[0] = %x (mask0 = %x, byte0 = %x)\n",
1641                             psmouse->packet[0], priv->mask0, priv->byte0);
1642                 return PSMOUSE_BAD_DATA;
1643         }
1644
1645         /* Bytes 2 - pktsize should have 0 in the highest bit */
1646         if (priv->proto_version < ALPS_PROTO_V5 &&
1647             psmouse->pktcnt >= 2 && psmouse->pktcnt <= psmouse->pktsize &&
1648             (psmouse->packet[psmouse->pktcnt - 1] & 0x80)) {
1649                 psmouse_dbg(psmouse, "refusing packet[%i] = %x\n",
1650                             psmouse->pktcnt - 1,
1651                             psmouse->packet[psmouse->pktcnt - 1]);
1652
1653                 if (priv->proto_version == ALPS_PROTO_V3_RUSHMORE &&
1654                     psmouse->pktcnt == psmouse->pktsize) {
1655                         /*
1656                          * Some Dell boxes, such as Latitude E6440 or E7440
1657                          * with closed lid, quite often smash last byte of
1658                          * otherwise valid packet with 0xff. Given that the
1659                          * next packet is very likely to be valid let's
1660                          * report PSMOUSE_FULL_PACKET but not process data,
1661                          * rather than reporting PSMOUSE_BAD_DATA and
1662                          * filling the logs.
1663                          */
1664                         return PSMOUSE_FULL_PACKET;
1665                 }
1666
1667                 return PSMOUSE_BAD_DATA;
1668         }
1669
1670         if ((priv->proto_version == ALPS_PROTO_V7 &&
1671                         !alps_is_valid_package_v7(psmouse)) ||
1672             (priv->proto_version == ALPS_PROTO_V8 &&
1673                         !alps_is_valid_package_ss4_v2(psmouse))) {
1674                 psmouse_dbg(psmouse, "refusing packet[%i] = %x\n",
1675                             psmouse->pktcnt - 1,
1676                             psmouse->packet[psmouse->pktcnt - 1]);
1677                 return PSMOUSE_BAD_DATA;
1678         }
1679
1680         if (psmouse->pktcnt == psmouse->pktsize) {
1681                 priv->process_packet(psmouse);
1682                 return PSMOUSE_FULL_PACKET;
1683         }
1684
1685         return PSMOUSE_GOOD_DATA;
1686 }
1687
1688 static int alps_command_mode_send_nibble(struct psmouse *psmouse, int nibble)
1689 {
1690         struct ps2dev *ps2dev = &psmouse->ps2dev;
1691         struct alps_data *priv = psmouse->private;
1692         int command;
1693         unsigned char *param;
1694         unsigned char dummy[4];
1695
1696         BUG_ON(nibble > 0xf);
1697
1698         command = priv->nibble_commands[nibble].command;
1699         param = (command & 0x0f00) ?
1700                 dummy : (unsigned char *)&priv->nibble_commands[nibble].data;
1701
1702         if (ps2_command(ps2dev, param, command))
1703                 return -1;
1704
1705         return 0;
1706 }
1707
1708 static int alps_command_mode_set_addr(struct psmouse *psmouse, int addr)
1709 {
1710         struct ps2dev *ps2dev = &psmouse->ps2dev;
1711         struct alps_data *priv = psmouse->private;
1712         int i, nibble;
1713
1714         if (ps2_command(ps2dev, NULL, priv->addr_command))
1715                 return -1;
1716
1717         for (i = 12; i >= 0; i -= 4) {
1718                 nibble = (addr >> i) & 0xf;
1719                 if (alps_command_mode_send_nibble(psmouse, nibble))
1720                         return -1;
1721         }
1722
1723         return 0;
1724 }
1725
1726 static int __alps_command_mode_read_reg(struct psmouse *psmouse, int addr)
1727 {
1728         struct ps2dev *ps2dev = &psmouse->ps2dev;
1729         unsigned char param[4];
1730
1731         if (ps2_command(ps2dev, param, PSMOUSE_CMD_GETINFO))
1732                 return -1;
1733
1734         /*
1735          * The address being read is returned in the first two bytes
1736          * of the result. Check that this address matches the expected
1737          * address.
1738          */
1739         if (addr != ((param[0] << 8) | param[1]))
1740                 return -1;
1741
1742         return param[2];
1743 }
1744
1745 static int alps_command_mode_read_reg(struct psmouse *psmouse, int addr)
1746 {
1747         if (alps_command_mode_set_addr(psmouse, addr))
1748                 return -1;
1749         return __alps_command_mode_read_reg(psmouse, addr);
1750 }
1751
1752 static int __alps_command_mode_write_reg(struct psmouse *psmouse, u8 value)
1753 {
1754         if (alps_command_mode_send_nibble(psmouse, (value >> 4) & 0xf))
1755                 return -1;
1756         if (alps_command_mode_send_nibble(psmouse, value & 0xf))
1757                 return -1;
1758         return 0;
1759 }
1760
1761 static int alps_command_mode_write_reg(struct psmouse *psmouse, int addr,
1762                                        u8 value)
1763 {
1764         if (alps_command_mode_set_addr(psmouse, addr))
1765                 return -1;
1766         return __alps_command_mode_write_reg(psmouse, value);
1767 }
1768
1769 static int alps_rpt_cmd(struct psmouse *psmouse, int init_command,
1770                         int repeated_command, unsigned char *param)
1771 {
1772         struct ps2dev *ps2dev = &psmouse->ps2dev;
1773
1774         param[0] = 0;
1775         if (init_command && ps2_command(ps2dev, param, init_command))
1776                 return -EIO;
1777
1778         if (ps2_command(ps2dev,  NULL, repeated_command) ||
1779             ps2_command(ps2dev,  NULL, repeated_command) ||
1780             ps2_command(ps2dev,  NULL, repeated_command))
1781                 return -EIO;
1782
1783         param[0] = param[1] = param[2] = 0xff;
1784         if (ps2_command(ps2dev, param, PSMOUSE_CMD_GETINFO))
1785                 return -EIO;
1786
1787         psmouse_dbg(psmouse, "%2.2X report: %3ph\n",
1788                     repeated_command, param);
1789         return 0;
1790 }
1791
1792 static bool alps_check_valid_firmware_id(unsigned char id[])
1793 {
1794         if (id[0] == 0x73)
1795                 return true;
1796
1797         if (id[0] == 0x88 &&
1798             (id[1] == 0x07 ||
1799              id[1] == 0x08 ||
1800              (id[1] & 0xf0) == 0xb0 ||
1801              (id[1] & 0xf0) == 0xc0)) {
1802                 return true;
1803         }
1804
1805         return false;
1806 }
1807
1808 static int alps_enter_command_mode(struct psmouse *psmouse)
1809 {
1810         unsigned char param[4];
1811
1812         if (alps_rpt_cmd(psmouse, 0, PSMOUSE_CMD_RESET_WRAP, param)) {
1813                 psmouse_err(psmouse, "failed to enter command mode\n");
1814                 return -1;
1815         }
1816
1817         if (!alps_check_valid_firmware_id(param)) {
1818                 psmouse_dbg(psmouse,
1819                             "unknown response while entering command mode\n");
1820                 return -1;
1821         }
1822         return 0;
1823 }
1824
1825 static inline int alps_exit_command_mode(struct psmouse *psmouse)
1826 {
1827         struct ps2dev *ps2dev = &psmouse->ps2dev;
1828         if (ps2_command(ps2dev, NULL, PSMOUSE_CMD_SETSTREAM))
1829                 return -1;
1830         return 0;
1831 }
1832
1833 /*
1834  * For DualPoint devices select the device that should respond to
1835  * subsequent commands. It looks like glidepad is behind stickpointer,
1836  * I'd thought it would be other way around...
1837  */
1838 static int alps_passthrough_mode_v2(struct psmouse *psmouse, bool enable)
1839 {
1840         struct ps2dev *ps2dev = &psmouse->ps2dev;
1841         int cmd = enable ? PSMOUSE_CMD_SETSCALE21 : PSMOUSE_CMD_SETSCALE11;
1842
1843         if (ps2_command(ps2dev, NULL, cmd) ||
1844             ps2_command(ps2dev, NULL, cmd) ||
1845             ps2_command(ps2dev, NULL, cmd) ||
1846             ps2_command(ps2dev, NULL, PSMOUSE_CMD_DISABLE))
1847                 return -1;
1848
1849         /* we may get 3 more bytes, just ignore them */
1850         ps2_drain(ps2dev, 3, 100);
1851
1852         return 0;
1853 }
1854
1855 static int alps_absolute_mode_v1_v2(struct psmouse *psmouse)
1856 {
1857         struct ps2dev *ps2dev = &psmouse->ps2dev;
1858
1859         /* Try ALPS magic knock - 4 disable before enable */
1860         if (ps2_command(ps2dev, NULL, PSMOUSE_CMD_DISABLE) ||
1861             ps2_command(ps2dev, NULL, PSMOUSE_CMD_DISABLE) ||
1862             ps2_command(ps2dev, NULL, PSMOUSE_CMD_DISABLE) ||
1863             ps2_command(ps2dev, NULL, PSMOUSE_CMD_DISABLE) ||
1864             ps2_command(ps2dev, NULL, PSMOUSE_CMD_ENABLE))
1865                 return -1;
1866
1867         /*
1868          * Switch mouse to poll (remote) mode so motion data will not
1869          * get in our way
1870          */
1871         return ps2_command(ps2dev, NULL, PSMOUSE_CMD_SETPOLL);
1872 }
1873
1874 static int alps_monitor_mode_send_word(struct psmouse *psmouse, u16 word)
1875 {
1876         int i, nibble;
1877
1878         /*
1879          * b0-b11 are valid bits, send sequence is inverse.
1880          * e.g. when word = 0x0123, nibble send sequence is 3, 2, 1
1881          */
1882         for (i = 0; i <= 8; i += 4) {
1883                 nibble = (word >> i) & 0xf;
1884                 if (alps_command_mode_send_nibble(psmouse, nibble))
1885                         return -1;
1886         }
1887
1888         return 0;
1889 }
1890
1891 static int alps_monitor_mode_write_reg(struct psmouse *psmouse,
1892                                        u16 addr, u16 value)
1893 {
1894         struct ps2dev *ps2dev = &psmouse->ps2dev;
1895
1896         /* 0x0A0 is the command to write the word */
1897         if (ps2_command(ps2dev, NULL, PSMOUSE_CMD_ENABLE) ||
1898             alps_monitor_mode_send_word(psmouse, 0x0A0) ||
1899             alps_monitor_mode_send_word(psmouse, addr) ||
1900             alps_monitor_mode_send_word(psmouse, value) ||
1901             ps2_command(ps2dev, NULL, PSMOUSE_CMD_DISABLE))
1902                 return -1;
1903
1904         return 0;
1905 }
1906
1907 static int alps_monitor_mode(struct psmouse *psmouse, bool enable)
1908 {
1909         struct ps2dev *ps2dev = &psmouse->ps2dev;
1910
1911         if (enable) {
1912                 /* EC E9 F5 F5 E7 E6 E7 E9 to enter monitor mode */
1913                 if (ps2_command(ps2dev, NULL, PSMOUSE_CMD_RESET_WRAP) ||
1914                     ps2_command(ps2dev, NULL, PSMOUSE_CMD_GETINFO) ||
1915                     ps2_command(ps2dev, NULL, PSMOUSE_CMD_DISABLE) ||
1916                     ps2_command(ps2dev, NULL, PSMOUSE_CMD_DISABLE) ||
1917                     ps2_command(ps2dev, NULL, PSMOUSE_CMD_SETSCALE21) ||
1918                     ps2_command(ps2dev, NULL, PSMOUSE_CMD_SETSCALE11) ||
1919                     ps2_command(ps2dev, NULL, PSMOUSE_CMD_SETSCALE21) ||
1920                     ps2_command(ps2dev, NULL, PSMOUSE_CMD_GETINFO))
1921                         return -1;
1922         } else {
1923                 /* EC to exit monitor mode */
1924                 if (ps2_command(ps2dev, NULL, PSMOUSE_CMD_RESET_WRAP))
1925                         return -1;
1926         }
1927
1928         return 0;
1929 }
1930
1931 static int alps_absolute_mode_v6(struct psmouse *psmouse)
1932 {
1933         u16 reg_val = 0x181;
1934         int ret = -1;
1935
1936         /* enter monitor mode, to write the register */
1937         if (alps_monitor_mode(psmouse, true))
1938                 return -1;
1939
1940         ret = alps_monitor_mode_write_reg(psmouse, 0x000, reg_val);
1941
1942         if (alps_monitor_mode(psmouse, false))
1943                 ret = -1;
1944
1945         return ret;
1946 }
1947
1948 static int alps_get_status(struct psmouse *psmouse, char *param)
1949 {
1950         /* Get status: 0xF5 0xF5 0xF5 0xE9 */
1951         if (alps_rpt_cmd(psmouse, 0, PSMOUSE_CMD_DISABLE, param))
1952                 return -1;
1953
1954         return 0;
1955 }
1956
1957 /*
1958  * Turn touchpad tapping on or off. The sequences are:
1959  * 0xE9 0xF5 0xF5 0xF3 0x0A to enable,
1960  * 0xE9 0xF5 0xF5 0xE8 0x00 to disable.
1961  * My guess that 0xE9 (GetInfo) is here as a sync point.
1962  * For models that also have stickpointer (DualPoints) its tapping
1963  * is controlled separately (0xE6 0xE6 0xE6 0xF3 0x14|0x0A) but
1964  * we don't fiddle with it.
1965  */
1966 static int alps_tap_mode(struct psmouse *psmouse, int enable)
1967 {
1968         struct ps2dev *ps2dev = &psmouse->ps2dev;
1969         int cmd = enable ? PSMOUSE_CMD_SETRATE : PSMOUSE_CMD_SETRES;
1970         unsigned char tap_arg = enable ? 0x0A : 0x00;
1971         unsigned char param[4];
1972
1973         if (ps2_command(ps2dev, param, PSMOUSE_CMD_GETINFO) ||
1974             ps2_command(ps2dev, NULL, PSMOUSE_CMD_DISABLE) ||
1975             ps2_command(ps2dev, NULL, PSMOUSE_CMD_DISABLE) ||
1976             ps2_command(ps2dev, &tap_arg, cmd))
1977                 return -1;
1978
1979         if (alps_get_status(psmouse, param))
1980                 return -1;
1981
1982         return 0;
1983 }
1984
1985 /*
1986  * alps_poll() - poll the touchpad for current motion packet.
1987  * Used in resync.
1988  */
1989 static int alps_poll(struct psmouse *psmouse)
1990 {
1991         struct alps_data *priv = psmouse->private;
1992         unsigned char buf[sizeof(psmouse->packet)];
1993         bool poll_failed;
1994
1995         if (priv->flags & ALPS_PASS)
1996                 alps_passthrough_mode_v2(psmouse, true);
1997
1998         poll_failed = ps2_command(&psmouse->ps2dev, buf,
1999                                   PSMOUSE_CMD_POLL | (psmouse->pktsize << 8)) < 0;
2000
2001         if (priv->flags & ALPS_PASS)
2002                 alps_passthrough_mode_v2(psmouse, false);
2003
2004         if (poll_failed || (buf[0] & priv->mask0) != priv->byte0)
2005                 return -1;
2006
2007         if ((psmouse->badbyte & 0xc8) == 0x08) {
2008 /*
2009  * Poll the track stick ...
2010  */
2011                 if (ps2_command(&psmouse->ps2dev, buf, PSMOUSE_CMD_POLL | (3 << 8)))
2012                         return -1;
2013         }
2014
2015         memcpy(psmouse->packet, buf, sizeof(buf));
2016         return 0;
2017 }
2018
2019 static int alps_hw_init_v1_v2(struct psmouse *psmouse)
2020 {
2021         struct alps_data *priv = psmouse->private;
2022
2023         if ((priv->flags & ALPS_PASS) &&
2024             alps_passthrough_mode_v2(psmouse, true)) {
2025                 return -1;
2026         }
2027
2028         if (alps_tap_mode(psmouse, true)) {
2029                 psmouse_warn(psmouse, "Failed to enable hardware tapping\n");
2030                 return -1;
2031         }
2032
2033         if (alps_absolute_mode_v1_v2(psmouse)) {
2034                 psmouse_err(psmouse, "Failed to enable absolute mode\n");
2035                 return -1;
2036         }
2037
2038         if ((priv->flags & ALPS_PASS) &&
2039             alps_passthrough_mode_v2(psmouse, false)) {
2040                 return -1;
2041         }
2042
2043         /* ALPS needs stream mode, otherwise it won't report any data */
2044         if (ps2_command(&psmouse->ps2dev, NULL, PSMOUSE_CMD_SETSTREAM)) {
2045                 psmouse_err(psmouse, "Failed to enable stream mode\n");
2046                 return -1;
2047         }
2048
2049         return 0;
2050 }
2051
2052 /* Must be in passthrough mode when calling this function */
2053 static int alps_trackstick_enter_extended_mode_v3_v6(struct psmouse *psmouse)
2054 {
2055         unsigned char param[2] = {0xC8, 0x14};
2056
2057         if (ps2_command(&psmouse->ps2dev, NULL, PSMOUSE_CMD_SETSCALE11) ||
2058             ps2_command(&psmouse->ps2dev, NULL, PSMOUSE_CMD_SETSCALE11) ||
2059             ps2_command(&psmouse->ps2dev, NULL, PSMOUSE_CMD_SETSCALE11) ||
2060             ps2_command(&psmouse->ps2dev, &param[0], PSMOUSE_CMD_SETRATE) ||
2061             ps2_command(&psmouse->ps2dev, &param[1], PSMOUSE_CMD_SETRATE))
2062                 return -1;
2063
2064         return 0;
2065 }
2066
2067 static int alps_hw_init_v6(struct psmouse *psmouse)
2068 {
2069         int ret;
2070
2071         /* Enter passthrough mode to let trackpoint enter 6byte raw mode */
2072         if (alps_passthrough_mode_v2(psmouse, true))
2073                 return -1;
2074
2075         ret = alps_trackstick_enter_extended_mode_v3_v6(psmouse);
2076
2077         if (alps_passthrough_mode_v2(psmouse, false))
2078                 return -1;
2079
2080         if (ret)
2081                 return ret;
2082
2083         if (alps_absolute_mode_v6(psmouse)) {
2084                 psmouse_err(psmouse, "Failed to enable absolute mode\n");
2085                 return -1;
2086         }
2087
2088         return 0;
2089 }
2090
2091 /*
2092  * Enable or disable passthrough mode to the trackstick.
2093  */
2094 static int alps_passthrough_mode_v3(struct psmouse *psmouse,
2095                                     int reg_base, bool enable)
2096 {
2097         int reg_val, ret = -1;
2098
2099         if (alps_enter_command_mode(psmouse))
2100                 return -1;
2101
2102         reg_val = alps_command_mode_read_reg(psmouse, reg_base + 0x0008);
2103         if (reg_val == -1)
2104                 goto error;
2105
2106         if (enable)
2107                 reg_val |= 0x01;
2108         else
2109                 reg_val &= ~0x01;
2110
2111         ret = __alps_command_mode_write_reg(psmouse, reg_val);
2112
2113 error:
2114         if (alps_exit_command_mode(psmouse))
2115                 ret = -1;
2116         return ret;
2117 }
2118
2119 /* Must be in command mode when calling this function */
2120 static int alps_absolute_mode_v3(struct psmouse *psmouse)
2121 {
2122         int reg_val;
2123
2124         reg_val = alps_command_mode_read_reg(psmouse, 0x0004);
2125         if (reg_val == -1)
2126                 return -1;
2127
2128         reg_val |= 0x06;
2129         if (__alps_command_mode_write_reg(psmouse, reg_val))
2130                 return -1;
2131
2132         return 0;
2133 }
2134
2135 static int alps_probe_trackstick_v3_v7(struct psmouse *psmouse, int reg_base)
2136 {
2137         int ret = -EIO, reg_val;
2138
2139         if (alps_enter_command_mode(psmouse))
2140                 goto error;
2141
2142         reg_val = alps_command_mode_read_reg(psmouse, reg_base + 0x08);
2143         if (reg_val == -1)
2144                 goto error;
2145
2146         /* bit 7: trackstick is present */
2147         ret = reg_val & 0x80 ? 0 : -ENODEV;
2148
2149 error:
2150         alps_exit_command_mode(psmouse);
2151         return ret;
2152 }
2153
2154 static int alps_setup_trackstick_v3(struct psmouse *psmouse, int reg_base)
2155 {
2156         int ret = 0;
2157         int reg_val;
2158         unsigned char param[4];
2159
2160         /*
2161          * We need to configure trackstick to report data for touchpad in
2162          * extended format. And also we need to tell touchpad to expect data
2163          * from trackstick in extended format. Without this configuration
2164          * trackstick packets sent from touchpad are in basic format which is
2165          * different from what we expect.
2166          */
2167
2168         if (alps_passthrough_mode_v3(psmouse, reg_base, true))
2169                 return -EIO;
2170
2171         /*
2172          * E7 report for the trackstick
2173          *
2174          * There have been reports of failures to seem to trace back
2175          * to the above trackstick check failing. When these occur
2176          * this E7 report fails, so when that happens we continue
2177          * with the assumption that there isn't a trackstick after
2178          * all.
2179          */
2180         if (alps_rpt_cmd(psmouse, 0, PSMOUSE_CMD_SETSCALE21, param)) {
2181                 psmouse_warn(psmouse, "Failed to initialize trackstick (E7 report failed)\n");
2182                 ret = -ENODEV;
2183         } else {
2184                 psmouse_dbg(psmouse, "trackstick E7 report: %3ph\n", param);
2185                 if (alps_trackstick_enter_extended_mode_v3_v6(psmouse)) {
2186                         psmouse_err(psmouse, "Failed to enter into trackstick extended mode\n");
2187                         ret = -EIO;
2188                 }
2189         }
2190
2191         if (alps_passthrough_mode_v3(psmouse, reg_base, false))
2192                 return -EIO;
2193
2194         if (ret)
2195                 return ret;
2196
2197         if (alps_enter_command_mode(psmouse))
2198                 return -EIO;
2199
2200         reg_val = alps_command_mode_read_reg(psmouse, reg_base + 0x08);
2201         if (reg_val == -1) {
2202                 ret = -EIO;
2203         } else {
2204                 /*
2205                  * Tell touchpad that trackstick is now in extended mode.
2206                  * If bit 1 isn't set the packet format is different.
2207                  */
2208                 reg_val |= BIT(1);
2209                 if (__alps_command_mode_write_reg(psmouse, reg_val))
2210                         ret = -EIO;
2211         }
2212
2213         if (alps_exit_command_mode(psmouse))
2214                 return -EIO;
2215
2216         return ret;
2217 }
2218
2219 static int alps_hw_init_v3(struct psmouse *psmouse)
2220 {
2221         struct alps_data *priv = psmouse->private;
2222         struct ps2dev *ps2dev = &psmouse->ps2dev;
2223         int reg_val;
2224         unsigned char param[4];
2225
2226         if ((priv->flags & ALPS_DUALPOINT) &&
2227             alps_setup_trackstick_v3(psmouse, ALPS_REG_BASE_PINNACLE) == -EIO)
2228                 goto error;
2229
2230         if (alps_enter_command_mode(psmouse) ||
2231             alps_absolute_mode_v3(psmouse)) {
2232                 psmouse_err(psmouse, "Failed to enter absolute mode\n");
2233                 goto error;
2234         }
2235
2236         reg_val = alps_command_mode_read_reg(psmouse, 0x0006);
2237         if (reg_val == -1)
2238                 goto error;
2239         if (__alps_command_mode_write_reg(psmouse, reg_val | 0x01))
2240                 goto error;
2241
2242         reg_val = alps_command_mode_read_reg(psmouse, 0x0007);
2243         if (reg_val == -1)
2244                 goto error;
2245         if (__alps_command_mode_write_reg(psmouse, reg_val | 0x01))
2246                 goto error;
2247
2248         if (alps_command_mode_read_reg(psmouse, 0x0144) == -1)
2249                 goto error;
2250         if (__alps_command_mode_write_reg(psmouse, 0x04))
2251                 goto error;
2252
2253         if (alps_command_mode_read_reg(psmouse, 0x0159) == -1)
2254                 goto error;
2255         if (__alps_command_mode_write_reg(psmouse, 0x03))
2256                 goto error;
2257
2258         if (alps_command_mode_read_reg(psmouse, 0x0163) == -1)
2259                 goto error;
2260         if (alps_command_mode_write_reg(psmouse, 0x0163, 0x03))
2261                 goto error;
2262
2263         if (alps_command_mode_read_reg(psmouse, 0x0162) == -1)
2264                 goto error;
2265         if (alps_command_mode_write_reg(psmouse, 0x0162, 0x04))
2266                 goto error;
2267
2268         alps_exit_command_mode(psmouse);
2269
2270         /* Set rate and enable data reporting */
2271         param[0] = 0x64;
2272         if (ps2_command(ps2dev, param, PSMOUSE_CMD_SETRATE) ||
2273             ps2_command(ps2dev, NULL, PSMOUSE_CMD_ENABLE)) {
2274                 psmouse_err(psmouse, "Failed to enable data reporting\n");
2275                 return -1;
2276         }
2277
2278         return 0;
2279
2280 error:
2281         /*
2282          * Leaving the touchpad in command mode will essentially render
2283          * it unusable until the machine reboots, so exit it here just
2284          * to be safe
2285          */
2286         alps_exit_command_mode(psmouse);
2287         return -1;
2288 }
2289
2290 static int alps_get_v3_v7_resolution(struct psmouse *psmouse, int reg_pitch)
2291 {
2292         int reg, x_pitch, y_pitch, x_electrode, y_electrode, x_phys, y_phys;
2293         struct alps_data *priv = psmouse->private;
2294
2295         reg = alps_command_mode_read_reg(psmouse, reg_pitch);
2296         if (reg < 0)
2297                 return reg;
2298
2299         x_pitch = (char)(reg << 4) >> 4; /* sign extend lower 4 bits */
2300         x_pitch = 50 + 2 * x_pitch; /* In 0.1 mm units */
2301
2302         y_pitch = (char)reg >> 4; /* sign extend upper 4 bits */
2303         y_pitch = 36 + 2 * y_pitch; /* In 0.1 mm units */
2304
2305         reg = alps_command_mode_read_reg(psmouse, reg_pitch + 1);
2306         if (reg < 0)
2307                 return reg;
2308
2309         x_electrode = (char)(reg << 4) >> 4; /* sign extend lower 4 bits */
2310         x_electrode = 17 + x_electrode;
2311
2312         y_electrode = (char)reg >> 4; /* sign extend upper 4 bits */
2313         y_electrode = 13 + y_electrode;
2314
2315         x_phys = x_pitch * (x_electrode - 1); /* In 0.1 mm units */
2316         y_phys = y_pitch * (y_electrode - 1); /* In 0.1 mm units */
2317
2318         priv->x_res = priv->x_max * 10 / x_phys; /* units / mm */
2319         priv->y_res = priv->y_max * 10 / y_phys; /* units / mm */
2320
2321         psmouse_dbg(psmouse,
2322                     "pitch %dx%d num-electrodes %dx%d physical size %dx%d mm res %dx%d\n",
2323                     x_pitch, y_pitch, x_electrode, y_electrode,
2324                     x_phys / 10, y_phys / 10, priv->x_res, priv->y_res);
2325
2326         return 0;
2327 }
2328
2329 static int alps_hw_init_rushmore_v3(struct psmouse *psmouse)
2330 {
2331         struct alps_data *priv = psmouse->private;
2332         struct ps2dev *ps2dev = &psmouse->ps2dev;
2333         int reg_val, ret = -1;
2334
2335         if (priv->flags & ALPS_DUALPOINT) {
2336                 reg_val = alps_setup_trackstick_v3(psmouse,
2337                                                    ALPS_REG_BASE_RUSHMORE);
2338                 if (reg_val == -EIO)
2339                         goto error;
2340         }
2341
2342         if (alps_enter_command_mode(psmouse) ||
2343             alps_command_mode_read_reg(psmouse, 0xc2d9) == -1 ||
2344             alps_command_mode_write_reg(psmouse, 0xc2cb, 0x00))
2345                 goto error;
2346
2347         if (alps_get_v3_v7_resolution(psmouse, 0xc2da))
2348                 goto error;
2349
2350         reg_val = alps_command_mode_read_reg(psmouse, 0xc2c6);
2351         if (reg_val == -1)
2352                 goto error;
2353         if (__alps_command_mode_write_reg(psmouse, reg_val & 0xfd))
2354                 goto error;
2355
2356         if (alps_command_mode_write_reg(psmouse, 0xc2c9, 0x64))
2357                 goto error;
2358
2359         /* enter absolute mode */
2360         reg_val = alps_command_mode_read_reg(psmouse, 0xc2c4);
2361         if (reg_val == -1)
2362                 goto error;
2363         if (__alps_command_mode_write_reg(psmouse, reg_val | 0x02))
2364                 goto error;
2365
2366         alps_exit_command_mode(psmouse);
2367         return ps2_command(ps2dev, NULL, PSMOUSE_CMD_ENABLE);
2368
2369 error:
2370         alps_exit_command_mode(psmouse);
2371         return ret;
2372 }
2373
2374 /* Must be in command mode when calling this function */
2375 static int alps_absolute_mode_v4(struct psmouse *psmouse)
2376 {
2377         int reg_val;
2378
2379         reg_val = alps_command_mode_read_reg(psmouse, 0x0004);
2380         if (reg_val == -1)
2381                 return -1;
2382
2383         reg_val |= 0x02;
2384         if (__alps_command_mode_write_reg(psmouse, reg_val))
2385                 return -1;
2386
2387         return 0;
2388 }
2389
2390 static int alps_hw_init_v4(struct psmouse *psmouse)
2391 {
2392         struct ps2dev *ps2dev = &psmouse->ps2dev;
2393         unsigned char param[4];
2394
2395         if (alps_enter_command_mode(psmouse))
2396                 goto error;
2397
2398         if (alps_absolute_mode_v4(psmouse)) {
2399                 psmouse_err(psmouse, "Failed to enter absolute mode\n");
2400                 goto error;
2401         }
2402
2403         if (alps_command_mode_write_reg(psmouse, 0x0007, 0x8c))
2404                 goto error;
2405
2406         if (alps_command_mode_write_reg(psmouse, 0x0149, 0x03))
2407                 goto error;
2408
2409         if (alps_command_mode_write_reg(psmouse, 0x0160, 0x03))
2410                 goto error;
2411
2412         if (alps_command_mode_write_reg(psmouse, 0x017f, 0x15))
2413                 goto error;
2414
2415         if (alps_command_mode_write_reg(psmouse, 0x0151, 0x01))
2416                 goto error;
2417
2418         if (alps_command_mode_write_reg(psmouse, 0x0168, 0x03))
2419                 goto error;
2420
2421         if (alps_command_mode_write_reg(psmouse, 0x014a, 0x03))
2422                 goto error;
2423
2424         if (alps_command_mode_write_reg(psmouse, 0x0161, 0x03))
2425                 goto error;
2426
2427         alps_exit_command_mode(psmouse);
2428
2429         /*
2430          * This sequence changes the output from a 9-byte to an
2431          * 8-byte format. All the same data seems to be present,
2432          * just in a more compact format.
2433          */
2434         param[0] = 0xc8;
2435         param[1] = 0x64;
2436         param[2] = 0x50;
2437         if (ps2_command(ps2dev, &param[0], PSMOUSE_CMD_SETRATE) ||
2438             ps2_command(ps2dev, &param[1], PSMOUSE_CMD_SETRATE) ||
2439             ps2_command(ps2dev, &param[2], PSMOUSE_CMD_SETRATE) ||
2440             ps2_command(ps2dev, param, PSMOUSE_CMD_GETID))
2441                 return -1;
2442
2443         /* Set rate and enable data reporting */
2444         param[0] = 0x64;
2445         if (ps2_command(ps2dev, param, PSMOUSE_CMD_SETRATE) ||
2446             ps2_command(ps2dev, NULL, PSMOUSE_CMD_ENABLE)) {
2447                 psmouse_err(psmouse, "Failed to enable data reporting\n");
2448                 return -1;
2449         }
2450
2451         return 0;
2452
2453 error:
2454         /*
2455          * Leaving the touchpad in command mode will essentially render
2456          * it unusable until the machine reboots, so exit it here just
2457          * to be safe
2458          */
2459         alps_exit_command_mode(psmouse);
2460         return -1;
2461 }
2462
2463 static int alps_get_otp_values_ss4_v2(struct psmouse *psmouse,
2464                                       unsigned char index, unsigned char otp[])
2465 {
2466         struct ps2dev *ps2dev = &psmouse->ps2dev;
2467
2468         switch (index) {
2469         case 0:
2470                 if (ps2_command(ps2dev, NULL, PSMOUSE_CMD_SETSTREAM)  ||
2471                     ps2_command(ps2dev, NULL, PSMOUSE_CMD_SETSTREAM)  ||
2472                     ps2_command(ps2dev, otp, PSMOUSE_CMD_GETINFO))
2473                         return -1;
2474
2475                 break;
2476
2477         case 1:
2478                 if (ps2_command(ps2dev, NULL, PSMOUSE_CMD_SETPOLL)  ||
2479                     ps2_command(ps2dev, NULL, PSMOUSE_CMD_SETPOLL)  ||
2480                     ps2_command(ps2dev, otp, PSMOUSE_CMD_GETINFO))
2481                         return -1;
2482
2483                 break;
2484         }
2485
2486         return 0;
2487 }
2488
2489 static int alps_update_device_area_ss4_v2(unsigned char otp[][4],
2490                                           struct alps_data *priv)
2491 {
2492         int num_x_electrode;
2493         int num_y_electrode;
2494         int x_pitch, y_pitch, x_phys, y_phys;
2495
2496         if (IS_SS4PLUS_DEV(priv->dev_id)) {
2497                 num_x_electrode =
2498                         SS4PLUS_NUMSENSOR_XOFFSET + (otp[0][2] & 0x0F);
2499                 num_y_electrode =
2500                         SS4PLUS_NUMSENSOR_YOFFSET + ((otp[0][2] >> 4) & 0x0F);
2501
2502                 priv->x_max =
2503                         (num_x_electrode - 1) * SS4PLUS_COUNT_PER_ELECTRODE;
2504                 priv->y_max =
2505                         (num_y_electrode - 1) * SS4PLUS_COUNT_PER_ELECTRODE;
2506
2507                 x_pitch = (otp[0][1] & 0x0F) + SS4PLUS_MIN_PITCH_MM;
2508                 y_pitch = ((otp[0][1] >> 4) & 0x0F) + SS4PLUS_MIN_PITCH_MM;
2509
2510         } else {
2511                 num_x_electrode =
2512                         SS4_NUMSENSOR_XOFFSET + (otp[1][0] & 0x0F);
2513                 num_y_electrode =
2514                         SS4_NUMSENSOR_YOFFSET + ((otp[1][0] >> 4) & 0x0F);
2515
2516                 priv->x_max =
2517                         (num_x_electrode - 1) * SS4_COUNT_PER_ELECTRODE;
2518                 priv->y_max =
2519                         (num_y_electrode - 1) * SS4_COUNT_PER_ELECTRODE;
2520
2521                 x_pitch = ((otp[1][2] >> 2) & 0x07) + SS4_MIN_PITCH_MM;
2522                 y_pitch = ((otp[1][2] >> 5) & 0x07) + SS4_MIN_PITCH_MM;
2523         }
2524
2525         x_phys = x_pitch * (num_x_electrode - 1); /* In 0.1 mm units */
2526         y_phys = y_pitch * (num_y_electrode - 1); /* In 0.1 mm units */
2527
2528         priv->x_res = priv->x_max * 10 / x_phys; /* units / mm */
2529         priv->y_res = priv->y_max * 10 / y_phys; /* units / mm */
2530
2531         return 0;
2532 }
2533
2534 static int alps_update_btn_info_ss4_v2(unsigned char otp[][4],
2535                                        struct alps_data *priv)
2536 {
2537         unsigned char is_btnless;
2538
2539         if (IS_SS4PLUS_DEV(priv->dev_id))
2540                 is_btnless = (otp[1][0] >> 1) & 0x01;
2541         else
2542                 is_btnless = (otp[1][1] >> 3) & 0x01;
2543
2544         if (is_btnless)
2545                 priv->flags |= ALPS_BUTTONPAD;
2546
2547         return 0;
2548 }
2549
2550 static int alps_update_dual_info_ss4_v2(unsigned char otp[][4],
2551                                         struct alps_data *priv,
2552                                         struct psmouse *psmouse)
2553 {
2554         bool is_dual = false;
2555         int reg_val = 0;
2556         struct ps2dev *ps2dev = &psmouse->ps2dev;
2557
2558         if (IS_SS4PLUS_DEV(priv->dev_id)) {
2559                 is_dual = (otp[0][0] >> 4) & 0x01;
2560
2561                 if (!is_dual) {
2562                         /* For support TrackStick of Thinkpad L/E series */
2563                         if (alps_exit_command_mode(psmouse) == 0 &&
2564                                 alps_enter_command_mode(psmouse) == 0) {
2565                                 reg_val = alps_command_mode_read_reg(psmouse,
2566                                                                         0xD7);
2567                         }
2568                         alps_exit_command_mode(psmouse);
2569                         ps2_command(ps2dev, NULL, PSMOUSE_CMD_ENABLE);
2570
2571                         if (reg_val == 0x0C || reg_val == 0x1D)
2572                                 is_dual = true;
2573                 }
2574         }
2575
2576         if (is_dual)
2577                 priv->flags |= ALPS_DUALPOINT |
2578                                         ALPS_DUALPOINT_WITH_PRESSURE;
2579
2580         return 0;
2581 }
2582
2583 static int alps_set_defaults_ss4_v2(struct psmouse *psmouse,
2584                                     struct alps_data *priv)
2585 {
2586         unsigned char otp[2][4];
2587
2588         memset(otp, 0, sizeof(otp));
2589
2590         if (alps_get_otp_values_ss4_v2(psmouse, 1, &otp[1][0]) ||
2591             alps_get_otp_values_ss4_v2(psmouse, 0, &otp[0][0]))
2592                 return -1;
2593
2594         alps_update_device_area_ss4_v2(otp, priv);
2595
2596         alps_update_btn_info_ss4_v2(otp, priv);
2597
2598         alps_update_dual_info_ss4_v2(otp, priv, psmouse);
2599
2600         return 0;
2601 }
2602
2603 static int alps_dolphin_get_device_area(struct psmouse *psmouse,
2604                                         struct alps_data *priv)
2605 {
2606         struct ps2dev *ps2dev = &psmouse->ps2dev;
2607         unsigned char param[4] = {0};
2608         int num_x_electrode, num_y_electrode;
2609
2610         if (alps_enter_command_mode(psmouse))
2611                 return -1;
2612
2613         param[0] = 0x0a;
2614         if (ps2_command(ps2dev, NULL, PSMOUSE_CMD_RESET_WRAP) ||
2615             ps2_command(ps2dev, NULL, PSMOUSE_CMD_SETPOLL) ||
2616             ps2_command(ps2dev, NULL, PSMOUSE_CMD_SETPOLL) ||
2617             ps2_command(ps2dev, &param[0], PSMOUSE_CMD_SETRATE) ||
2618             ps2_command(ps2dev, &param[0], PSMOUSE_CMD_SETRATE))
2619                 return -1;
2620
2621         if (ps2_command(ps2dev, param, PSMOUSE_CMD_GETINFO))
2622                 return -1;
2623
2624         /*
2625          * Dolphin's sensor line number is not fixed. It can be calculated
2626          * by adding the device's register value with DOLPHIN_PROFILE_X/YOFFSET.
2627          * Further more, we can get device's x_max and y_max by multiplying
2628          * sensor line number with DOLPHIN_COUNT_PER_ELECTRODE.
2629          *
2630          * e.g. When we get register's sensor_x = 11 & sensor_y = 8,
2631          *      real sensor line number X = 11 + 8 = 19, and
2632          *      real sensor line number Y = 8 + 1 = 9.
2633          *      So, x_max = (19 - 1) * 64 = 1152, and
2634          *          y_max = (9 - 1) * 64 = 512.
2635          */
2636         num_x_electrode = DOLPHIN_PROFILE_XOFFSET + (param[2] & 0x0F);
2637         num_y_electrode = DOLPHIN_PROFILE_YOFFSET + ((param[2] >> 4) & 0x0F);
2638         priv->x_bits = num_x_electrode;
2639         priv->y_bits = num_y_electrode;
2640         priv->x_max = (num_x_electrode - 1) * DOLPHIN_COUNT_PER_ELECTRODE;
2641         priv->y_max = (num_y_electrode - 1) * DOLPHIN_COUNT_PER_ELECTRODE;
2642
2643         if (alps_exit_command_mode(psmouse))
2644                 return -1;
2645
2646         return 0;
2647 }
2648
2649 static int alps_hw_init_dolphin_v1(struct psmouse *psmouse)
2650 {
2651         struct ps2dev *ps2dev = &psmouse->ps2dev;
2652         unsigned char param[2];
2653
2654         /* This is dolphin "v1" as empirically defined by florin9doi */
2655         param[0] = 0x64;
2656         param[1] = 0x28;
2657
2658         if (ps2_command(ps2dev, NULL, PSMOUSE_CMD_SETSTREAM) ||
2659             ps2_command(ps2dev, &param[0], PSMOUSE_CMD_SETRATE) ||
2660             ps2_command(ps2dev, &param[1], PSMOUSE_CMD_SETRATE))
2661                 return -1;
2662
2663         return 0;
2664 }
2665
2666 static int alps_hw_init_v7(struct psmouse *psmouse)
2667 {
2668         struct ps2dev *ps2dev = &psmouse->ps2dev;
2669         int reg_val, ret = -1;
2670
2671         if (alps_enter_command_mode(psmouse) ||
2672             alps_command_mode_read_reg(psmouse, 0xc2d9) == -1)
2673                 goto error;
2674
2675         if (alps_get_v3_v7_resolution(psmouse, 0xc397))
2676                 goto error;
2677
2678         if (alps_command_mode_write_reg(psmouse, 0xc2c9, 0x64))
2679                 goto error;
2680
2681         reg_val = alps_command_mode_read_reg(psmouse, 0xc2c4);
2682         if (reg_val == -1)
2683                 goto error;
2684         if (__alps_command_mode_write_reg(psmouse, reg_val | 0x02))
2685                 goto error;
2686
2687         alps_exit_command_mode(psmouse);
2688         return ps2_command(ps2dev, NULL, PSMOUSE_CMD_ENABLE);
2689
2690 error:
2691         alps_exit_command_mode(psmouse);
2692         return ret;
2693 }
2694
2695 static int alps_hw_init_ss4_v2(struct psmouse *psmouse)
2696 {
2697         struct ps2dev *ps2dev = &psmouse->ps2dev;
2698         char param[2] = {0x64, 0x28};
2699         int ret = -1;
2700
2701         /* enter absolute mode */
2702         if (ps2_command(ps2dev, NULL, PSMOUSE_CMD_SETSTREAM) ||
2703             ps2_command(ps2dev, NULL, PSMOUSE_CMD_SETSTREAM) ||
2704             ps2_command(ps2dev, &param[0], PSMOUSE_CMD_SETRATE) ||
2705             ps2_command(ps2dev, &param[1], PSMOUSE_CMD_SETRATE)) {
2706                 goto error;
2707         }
2708
2709         /* T.B.D. Decread noise packet number, delete in the future */
2710         if (alps_exit_command_mode(psmouse) ||
2711             alps_enter_command_mode(psmouse) ||
2712             alps_command_mode_write_reg(psmouse, 0x001D, 0x20)) {
2713                 goto error;
2714         }
2715         alps_exit_command_mode(psmouse);
2716
2717         return ps2_command(ps2dev, NULL, PSMOUSE_CMD_ENABLE);
2718
2719 error:
2720         alps_exit_command_mode(psmouse);
2721         return ret;
2722 }
2723
2724 static int alps_set_protocol(struct psmouse *psmouse,
2725                              struct alps_data *priv,
2726                              const struct alps_protocol_info *protocol)
2727 {
2728         psmouse->private = priv;
2729
2730         timer_setup(&priv->timer, alps_flush_packet, 0);
2731
2732         priv->proto_version = protocol->version;
2733         priv->byte0 = protocol->byte0;
2734         priv->mask0 = protocol->mask0;
2735         priv->flags = protocol->flags;
2736
2737         priv->x_max = 2000;
2738         priv->y_max = 1400;
2739         priv->x_bits = 15;
2740         priv->y_bits = 11;
2741
2742         switch (priv->proto_version) {
2743         case ALPS_PROTO_V1:
2744         case ALPS_PROTO_V2:
2745                 priv->hw_init = alps_hw_init_v1_v2;
2746                 priv->process_packet = alps_process_packet_v1_v2;
2747                 priv->set_abs_params = alps_set_abs_params_st;
2748                 priv->x_max = 1023;
2749                 priv->y_max = 767;
2750                 if (dmi_check_system(alps_dmi_has_separate_stick_buttons))
2751                         priv->flags |= ALPS_STICK_BITS;
2752                 break;
2753
2754         case ALPS_PROTO_V3:
2755                 priv->hw_init = alps_hw_init_v3;
2756                 priv->process_packet = alps_process_packet_v3;
2757                 priv->set_abs_params = alps_set_abs_params_semi_mt;
2758                 priv->decode_fields = alps_decode_pinnacle;
2759                 priv->nibble_commands = alps_v3_nibble_commands;
2760                 priv->addr_command = PSMOUSE_CMD_RESET_WRAP;
2761
2762                 if (alps_probe_trackstick_v3_v7(psmouse,
2763                                                 ALPS_REG_BASE_PINNACLE) < 0)
2764                         priv->flags &= ~ALPS_DUALPOINT;
2765
2766                 break;
2767
2768         case ALPS_PROTO_V3_RUSHMORE:
2769                 priv->hw_init = alps_hw_init_rushmore_v3;
2770                 priv->process_packet = alps_process_packet_v3;
2771                 priv->set_abs_params = alps_set_abs_params_semi_mt;
2772                 priv->decode_fields = alps_decode_rushmore;
2773                 priv->nibble_commands = alps_v3_nibble_commands;
2774                 priv->addr_command = PSMOUSE_CMD_RESET_WRAP;
2775                 priv->x_bits = 16;
2776                 priv->y_bits = 12;
2777
2778                 if (alps_probe_trackstick_v3_v7(psmouse,
2779                                                 ALPS_REG_BASE_RUSHMORE) < 0)
2780                         priv->flags &= ~ALPS_DUALPOINT;
2781
2782                 break;
2783
2784         case ALPS_PROTO_V4:
2785                 priv->hw_init = alps_hw_init_v4;
2786                 priv->process_packet = alps_process_packet_v4;
2787                 priv->set_abs_params = alps_set_abs_params_semi_mt;
2788                 priv->nibble_commands = alps_v4_nibble_commands;
2789                 priv->addr_command = PSMOUSE_CMD_DISABLE;
2790                 break;
2791
2792         case ALPS_PROTO_V5:
2793                 priv->hw_init = alps_hw_init_dolphin_v1;
2794                 priv->process_packet = alps_process_touchpad_packet_v3_v5;
2795                 priv->decode_fields = alps_decode_dolphin;
2796                 priv->set_abs_params = alps_set_abs_params_semi_mt;
2797                 priv->nibble_commands = alps_v3_nibble_commands;
2798                 priv->addr_command = PSMOUSE_CMD_RESET_WRAP;
2799                 priv->x_bits = 23;
2800                 priv->y_bits = 12;
2801
2802                 if (alps_dolphin_get_device_area(psmouse, priv))
2803                         return -EIO;
2804
2805                 break;
2806
2807         case ALPS_PROTO_V6:
2808                 priv->hw_init = alps_hw_init_v6;
2809                 priv->process_packet = alps_process_packet_v6;
2810                 priv->set_abs_params = alps_set_abs_params_st;
2811                 priv->nibble_commands = alps_v6_nibble_commands;
2812                 priv->x_max = 2047;
2813                 priv->y_max = 1535;
2814                 break;
2815
2816         case ALPS_PROTO_V7:
2817                 priv->hw_init = alps_hw_init_v7;
2818                 priv->process_packet = alps_process_packet_v7;
2819                 priv->decode_fields = alps_decode_packet_v7;
2820                 priv->set_abs_params = alps_set_abs_params_v7;
2821                 priv->nibble_commands = alps_v3_nibble_commands;
2822                 priv->addr_command = PSMOUSE_CMD_RESET_WRAP;
2823                 priv->x_max = 0xfff;
2824                 priv->y_max = 0x7ff;
2825
2826                 if (priv->fw_ver[1] != 0xba)
2827                         priv->flags |= ALPS_BUTTONPAD;
2828
2829                 if (alps_probe_trackstick_v3_v7(psmouse, ALPS_REG_BASE_V7) < 0)
2830                         priv->flags &= ~ALPS_DUALPOINT;
2831
2832                 break;
2833
2834         case ALPS_PROTO_V8:
2835                 priv->hw_init = alps_hw_init_ss4_v2;
2836                 priv->process_packet = alps_process_packet_ss4_v2;
2837                 priv->decode_fields = alps_decode_ss4_v2;
2838                 priv->set_abs_params = alps_set_abs_params_ss4_v2;
2839                 priv->nibble_commands = alps_v3_nibble_commands;
2840                 priv->addr_command = PSMOUSE_CMD_RESET_WRAP;
2841
2842                 if (alps_set_defaults_ss4_v2(psmouse, priv))
2843                         return -EIO;
2844
2845                 break;
2846         }
2847
2848         return 0;
2849 }
2850
2851 static const struct alps_protocol_info *alps_match_table(unsigned char *e7,
2852                                                          unsigned char *ec)
2853 {
2854         const struct alps_model_info *model;
2855         int i;
2856
2857         for (i = 0; i < ARRAY_SIZE(alps_model_data); i++) {
2858                 model = &alps_model_data[i];
2859
2860                 if (!memcmp(e7, model->signature, sizeof(model->signature)))
2861                         return &model->protocol_info;
2862         }
2863
2864         return NULL;
2865 }
2866
2867 static int alps_identify(struct psmouse *psmouse, struct alps_data *priv)
2868 {
2869         const struct alps_protocol_info *protocol;
2870         unsigned char e6[4], e7[4], ec[4];
2871         int error;
2872
2873         /*
2874          * First try "E6 report".
2875          * ALPS should return 0,0,10 or 0,0,100 if no buttons are pressed.
2876          * The bits 0-2 of the first byte will be 1s if some buttons are
2877          * pressed.
2878          */
2879         if (alps_rpt_cmd(psmouse, PSMOUSE_CMD_SETRES,
2880                          PSMOUSE_CMD_SETSCALE11, e6))
2881                 return -EIO;
2882
2883         if ((e6[0] & 0xf8) != 0 || e6[1] != 0 || (e6[2] != 10 && e6[2] != 100))
2884                 return -EINVAL;
2885
2886         /*
2887          * Now get the "E7" and "EC" reports.  These will uniquely identify
2888          * most ALPS touchpads.
2889          */
2890         if (alps_rpt_cmd(psmouse, PSMOUSE_CMD_SETRES,
2891                          PSMOUSE_CMD_SETSCALE21, e7) ||
2892             alps_rpt_cmd(psmouse, PSMOUSE_CMD_SETRES,
2893                          PSMOUSE_CMD_RESET_WRAP, ec) ||
2894             alps_exit_command_mode(psmouse))
2895                 return -EIO;
2896
2897         protocol = alps_match_table(e7, ec);
2898         if (!protocol) {
2899                 if (e7[0] == 0x73 && e7[1] == 0x02 && e7[2] == 0x64 &&
2900                            ec[2] == 0x8a) {
2901                         protocol = &alps_v4_protocol_data;
2902                 } else if (e7[0] == 0x73 && e7[1] == 0x03 && e7[2] == 0x50 &&
2903                            ec[0] == 0x73 && (ec[1] == 0x01 || ec[1] == 0x02)) {
2904                         protocol = &alps_v5_protocol_data;
2905                 } else if (ec[0] == 0x88 &&
2906                            ((ec[1] & 0xf0) == 0xb0 || (ec[1] & 0xf0) == 0xc0)) {
2907                         protocol = &alps_v7_protocol_data;
2908                 } else if (ec[0] == 0x88 && ec[1] == 0x08) {
2909                         protocol = &alps_v3_rushmore_data;
2910                 } else if (ec[0] == 0x88 && ec[1] == 0x07 &&
2911                            ec[2] >= 0x90 && ec[2] <= 0x9d) {
2912                         protocol = &alps_v3_protocol_data;
2913                 } else if (e7[0] == 0x73 && e7[1] == 0x03 &&
2914                            (e7[2] == 0x14 || e7[2] == 0x28)) {
2915                         protocol = &alps_v8_protocol_data;
2916                 } else if (e7[0] == 0x73 && e7[1] == 0x03 && e7[2] == 0xc8) {
2917                         protocol = &alps_v9_protocol_data;
2918                         psmouse_warn(psmouse,
2919                                      "Unsupported ALPS V9 touchpad: E7=%3ph, EC=%3ph\n",
2920                                      e7, ec);
2921                         return -EINVAL;
2922                 } else {
2923                         psmouse_dbg(psmouse,
2924                                     "Likely not an ALPS touchpad: E7=%3ph, EC=%3ph\n", e7, ec);
2925                         return -EINVAL;
2926                 }
2927         }
2928
2929         if (priv) {
2930                 /* Save Device ID and Firmware version */
2931                 memcpy(priv->dev_id, e7, 3);
2932                 memcpy(priv->fw_ver, ec, 3);
2933                 error = alps_set_protocol(psmouse, priv, protocol);
2934                 if (error)
2935                         return error;
2936         }
2937
2938         return 0;
2939 }
2940
2941 static int alps_reconnect(struct psmouse *psmouse)
2942 {
2943         struct alps_data *priv = psmouse->private;
2944
2945         psmouse_reset(psmouse);
2946
2947         if (alps_identify(psmouse, priv) < 0)
2948                 return -1;
2949
2950         return priv->hw_init(psmouse);
2951 }
2952
2953 static void alps_disconnect(struct psmouse *psmouse)
2954 {
2955         struct alps_data *priv = psmouse->private;
2956
2957         psmouse_reset(psmouse);
2958         del_timer_sync(&priv->timer);
2959         if (priv->dev2)
2960                 input_unregister_device(priv->dev2);
2961         if (!IS_ERR_OR_NULL(priv->dev3))
2962                 input_unregister_device(priv->dev3);
2963         kfree(priv);
2964 }
2965
2966 static void alps_set_abs_params_st(struct alps_data *priv,
2967                                    struct input_dev *dev1)
2968 {
2969         input_set_abs_params(dev1, ABS_X, 0, priv->x_max, 0, 0);
2970         input_set_abs_params(dev1, ABS_Y, 0, priv->y_max, 0, 0);
2971         input_set_abs_params(dev1, ABS_PRESSURE, 0, 127, 0, 0);
2972 }
2973
2974 static void alps_set_abs_params_mt_common(struct alps_data *priv,
2975                                           struct input_dev *dev1)
2976 {
2977         input_set_abs_params(dev1, ABS_MT_POSITION_X, 0, priv->x_max, 0, 0);
2978         input_set_abs_params(dev1, ABS_MT_POSITION_Y, 0, priv->y_max, 0, 0);
2979
2980         input_abs_set_res(dev1, ABS_MT_POSITION_X, priv->x_res);
2981         input_abs_set_res(dev1, ABS_MT_POSITION_Y, priv->y_res);
2982
2983         set_bit(BTN_TOOL_TRIPLETAP, dev1->keybit);
2984         set_bit(BTN_TOOL_QUADTAP, dev1->keybit);
2985 }
2986
2987 static void alps_set_abs_params_semi_mt(struct alps_data *priv,
2988                                         struct input_dev *dev1)
2989 {
2990         alps_set_abs_params_mt_common(priv, dev1);
2991         input_set_abs_params(dev1, ABS_PRESSURE, 0, 127, 0, 0);
2992
2993         input_mt_init_slots(dev1, MAX_TOUCHES,
2994                             INPUT_MT_POINTER | INPUT_MT_DROP_UNUSED |
2995                                 INPUT_MT_SEMI_MT);
2996 }
2997
2998 static void alps_set_abs_params_v7(struct alps_data *priv,
2999                                    struct input_dev *dev1)
3000 {
3001         alps_set_abs_params_mt_common(priv, dev1);
3002         set_bit(BTN_TOOL_QUINTTAP, dev1->keybit);
3003
3004         input_mt_init_slots(dev1, MAX_TOUCHES,
3005                             INPUT_MT_POINTER | INPUT_MT_DROP_UNUSED |
3006                                 INPUT_MT_TRACK);
3007
3008         set_bit(BTN_TOOL_QUINTTAP, dev1->keybit);
3009 }
3010
3011 static void alps_set_abs_params_ss4_v2(struct alps_data *priv,
3012                                        struct input_dev *dev1)
3013 {
3014         alps_set_abs_params_mt_common(priv, dev1);
3015         input_set_abs_params(dev1, ABS_PRESSURE, 0, 127, 0, 0);
3016         set_bit(BTN_TOOL_QUINTTAP, dev1->keybit);
3017
3018         input_mt_init_slots(dev1, MAX_TOUCHES,
3019                             INPUT_MT_POINTER | INPUT_MT_DROP_UNUSED |
3020                                 INPUT_MT_TRACK);
3021 }
3022
3023 int alps_init(struct psmouse *psmouse)
3024 {
3025         struct alps_data *priv = psmouse->private;
3026         struct input_dev *dev1 = psmouse->dev;
3027         int error;
3028
3029         error = priv->hw_init(psmouse);
3030         if (error)
3031                 goto init_fail;
3032
3033         /*
3034          * Undo part of setup done for us by psmouse core since touchpad
3035          * is not a relative device.
3036          */
3037         __clear_bit(EV_REL, dev1->evbit);
3038         __clear_bit(REL_X, dev1->relbit);
3039         __clear_bit(REL_Y, dev1->relbit);
3040
3041         /*
3042          * Now set up our capabilities.
3043          */
3044         dev1->evbit[BIT_WORD(EV_KEY)] |= BIT_MASK(EV_KEY);
3045         dev1->keybit[BIT_WORD(BTN_TOUCH)] |= BIT_MASK(BTN_TOUCH);
3046         dev1->keybit[BIT_WORD(BTN_TOOL_FINGER)] |= BIT_MASK(BTN_TOOL_FINGER);
3047         dev1->keybit[BIT_WORD(BTN_LEFT)] |=
3048                 BIT_MASK(BTN_LEFT) | BIT_MASK(BTN_RIGHT);
3049
3050         dev1->evbit[BIT_WORD(EV_ABS)] |= BIT_MASK(EV_ABS);
3051
3052         priv->set_abs_params(priv, dev1);
3053
3054         if (priv->flags & ALPS_WHEEL) {
3055                 dev1->evbit[BIT_WORD(EV_REL)] |= BIT_MASK(EV_REL);
3056                 dev1->relbit[BIT_WORD(REL_WHEEL)] |= BIT_MASK(REL_WHEEL);
3057         }
3058
3059         if (priv->flags & (ALPS_FW_BK_1 | ALPS_FW_BK_2)) {
3060                 dev1->keybit[BIT_WORD(BTN_FORWARD)] |= BIT_MASK(BTN_FORWARD);
3061                 dev1->keybit[BIT_WORD(BTN_BACK)] |= BIT_MASK(BTN_BACK);
3062         }
3063
3064         if (priv->flags & ALPS_FOUR_BUTTONS) {
3065                 dev1->keybit[BIT_WORD(BTN_0)] |= BIT_MASK(BTN_0);
3066                 dev1->keybit[BIT_WORD(BTN_1)] |= BIT_MASK(BTN_1);
3067                 dev1->keybit[BIT_WORD(BTN_2)] |= BIT_MASK(BTN_2);
3068                 dev1->keybit[BIT_WORD(BTN_3)] |= BIT_MASK(BTN_3);
3069         } else if (priv->flags & ALPS_BUTTONPAD) {
3070                 set_bit(INPUT_PROP_BUTTONPAD, dev1->propbit);
3071                 clear_bit(BTN_RIGHT, dev1->keybit);
3072         } else {
3073                 dev1->keybit[BIT_WORD(BTN_MIDDLE)] |= BIT_MASK(BTN_MIDDLE);
3074         }
3075
3076         if (priv->flags & ALPS_DUALPOINT) {
3077                 struct input_dev *dev2;
3078
3079                 dev2 = input_allocate_device();
3080                 if (!dev2) {
3081                         psmouse_err(psmouse,
3082                                     "failed to allocate trackstick device\n");
3083                         error = -ENOMEM;
3084                         goto init_fail;
3085                 }
3086
3087                 snprintf(priv->phys2, sizeof(priv->phys2), "%s/input1",
3088                          psmouse->ps2dev.serio->phys);
3089                 dev2->phys = priv->phys2;
3090
3091                 /*
3092                  * format of input device name is: "protocol vendor name"
3093                  * see function psmouse_switch_protocol() in psmouse-base.c
3094                  */
3095                 dev2->name = "AlpsPS/2 ALPS DualPoint Stick";
3096
3097                 dev2->id.bustype = BUS_I8042;
3098                 dev2->id.vendor  = 0x0002;
3099                 dev2->id.product = PSMOUSE_ALPS;
3100                 dev2->id.version = priv->proto_version;
3101                 dev2->dev.parent = &psmouse->ps2dev.serio->dev;
3102
3103                 input_set_capability(dev2, EV_REL, REL_X);
3104                 input_set_capability(dev2, EV_REL, REL_Y);
3105                 if (priv->flags & ALPS_DUALPOINT_WITH_PRESSURE) {
3106                         input_set_capability(dev2, EV_ABS, ABS_PRESSURE);
3107                         input_set_abs_params(dev2, ABS_PRESSURE, 0, 127, 0, 0);
3108                 }
3109                 input_set_capability(dev2, EV_KEY, BTN_LEFT);
3110                 input_set_capability(dev2, EV_KEY, BTN_RIGHT);
3111                 input_set_capability(dev2, EV_KEY, BTN_MIDDLE);
3112
3113                 __set_bit(INPUT_PROP_POINTER, dev2->propbit);
3114                 __set_bit(INPUT_PROP_POINTING_STICK, dev2->propbit);
3115
3116                 error = input_register_device(dev2);
3117                 if (error) {
3118                         psmouse_err(psmouse,
3119                                     "failed to register trackstick device: %d\n",
3120                                     error);
3121                         input_free_device(dev2);
3122                         goto init_fail;
3123                 }
3124
3125                 priv->dev2 = dev2;
3126         }
3127
3128         priv->psmouse = psmouse;
3129
3130         INIT_DELAYED_WORK(&priv->dev3_register_work,
3131                           alps_register_bare_ps2_mouse);
3132
3133         psmouse->protocol_handler = alps_process_byte;
3134         psmouse->poll = alps_poll;
3135         psmouse->disconnect = alps_disconnect;
3136         psmouse->reconnect = alps_reconnect;
3137         psmouse->pktsize = priv->proto_version == ALPS_PROTO_V4 ? 8 : 6;
3138
3139         /* We are having trouble resyncing ALPS touchpads so disable it for now */
3140         psmouse->resync_time = 0;
3141
3142         /* Allow 2 invalid packets without resetting device */
3143         psmouse->resetafter = psmouse->pktsize * 2;
3144
3145         return 0;
3146
3147 init_fail:
3148         psmouse_reset(psmouse);
3149         /*
3150          * Even though we did not allocate psmouse->private we do free
3151          * it here.
3152          */
3153         kfree(psmouse->private);
3154         psmouse->private = NULL;
3155         return error;
3156 }
3157
3158 int alps_detect(struct psmouse *psmouse, bool set_properties)
3159 {
3160         struct alps_data *priv;
3161         int error;
3162
3163         error = alps_identify(psmouse, NULL);
3164         if (error)
3165                 return error;
3166
3167         /*
3168          * Reset the device to make sure it is fully operational:
3169          * on some laptops, like certain Dell Latitudes, we may
3170          * fail to properly detect presence of trackstick if device
3171          * has not been reset.
3172          */
3173         psmouse_reset(psmouse);
3174
3175         priv = kzalloc(sizeof(struct alps_data), GFP_KERNEL);
3176         if (!priv)
3177                 return -ENOMEM;
3178
3179         error = alps_identify(psmouse, priv);
3180         if (error) {
3181                 kfree(priv);
3182                 return error;
3183         }
3184
3185         if (set_properties) {
3186                 psmouse->vendor = "ALPS";
3187                 psmouse->name = priv->flags & ALPS_DUALPOINT ?
3188                                 "DualPoint TouchPad" : "GlidePoint";
3189                 psmouse->model = priv->proto_version;
3190         } else {
3191                 /*
3192                  * Destroy alps_data structure we allocated earlier since
3193                  * this was just a "trial run". Otherwise we'll keep it
3194                  * to be used by alps_init() which has to be called if
3195                  * we succeed and set_properties is true.
3196                  */
3197                 kfree(priv);
3198                 psmouse->private = NULL;
3199         }
3200
3201         return 0;
3202 }
3203