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         { { 0x32, 0x02, 0x14 }, 0x00, { ALPS_PROTO_V2, 0xf8, 0xf8, ALPS_PASS | ALPS_DUALPOINT } },      /* Toshiba Salellite Pro M10 */
 110         { { 0x33, 0x02, 0x0a }, 0x00, { ALPS_PROTO_V1, 0x88, 0xf8, 0 } },                               /* UMAX-530T */
 111         { { 0x53, 0x02, 0x0a }, 0x00, { ALPS_PROTO_V2, 0xf8, 0xf8, 0 } },
 112         { { 0x53, 0x02, 0x14 }, 0x00, { ALPS_PROTO_V2, 0xf8, 0xf8, 0 } },
 113         { { 0x60, 0x03, 0xc8 }, 0x00, { ALPS_PROTO_V2, 0xf8, 0xf8, 0 } },                               /* HP ze1115 */
 114         { { 0x63, 0x02, 0x0a }, 0x00, { ALPS_PROTO_V2, 0xf8, 0xf8, 0 } },
 115         { { 0x63, 0x02, 0x14 }, 0x00, { ALPS_PROTO_V2, 0xf8, 0xf8, 0 } },
 116         { { 0x63, 0x02, 0x28 }, 0x00, { ALPS_PROTO_V2, 0xf8, 0xf8, ALPS_FW_BK_2 } },            /* Fujitsu Siemens S6010 */
 117         { { 0x63, 0x02, 0x3c }, 0x00, { ALPS_PROTO_V2, 0x8f, 0x8f, ALPS_WHEEL } },              /* Toshiba Satellite S2400-103 */
 118         { { 0x63, 0x02, 0x50 }, 0x00, { ALPS_PROTO_V2, 0xef, 0xef, ALPS_FW_BK_1 } },            /* NEC Versa L320 */
 119         { { 0x63, 0x02, 0x64 }, 0x00, { ALPS_PROTO_V2, 0xf8, 0xf8, 0 } },
 120         { { 0x63, 0x03, 0xc8 }, 0x00, { ALPS_PROTO_V2, 0xf8, 0xf8, ALPS_PASS | ALPS_DUALPOINT } },      /* Dell Latitude D800 */
 121         { { 0x73, 0x00, 0x0a }, 0x00, { ALPS_PROTO_V2, 0xf8, 0xf8, ALPS_DUALPOINT } },          /* ThinkPad R61 8918-5QG */
 122         { { 0x73, 0x02, 0x0a }, 0x00, { ALPS_PROTO_V2, 0xf8, 0xf8, 0 } },
 123         { { 0x73, 0x02, 0x14 }, 0x00, { ALPS_PROTO_V2, 0xf8, 0xf8, ALPS_FW_BK_2 } },            /* Ahtec Laptop */
 124
 125         /*
 126          * XXX This entry is suspicious. First byte has zero lower nibble,
 127          * which is what a normal mouse would report. Also, the value 0x0e
 128          * isn't valid per PS/2 spec.
 129          */
 130         { { 0x20, 0x02, 0x0e }, 0x00, { ALPS_PROTO_V2, 0xf8, 0xf8, ALPS_PASS | ALPS_DUALPOINT } },
 131
 132         { { 0x22, 0x02, 0x0a }, 0x00, { ALPS_PROTO_V2, 0xf8, 0xf8, ALPS_PASS | ALPS_DUALPOINT } },
 133         { { 0x22, 0x02, 0x14 }, 0x00, { ALPS_PROTO_V2, 0xff, 0xff, ALPS_PASS | ALPS_DUALPOINT } },      /* Dell Latitude D600 */
 134         /* Dell Latitude E5500, E6400, E6500, Precision M4400 */
 135         { { 0x62, 0x02, 0x14 }, 0x00, { ALPS_PROTO_V2, 0xcf, 0xcf,
 136                 ALPS_PASS | ALPS_DUALPOINT | ALPS_PS2_INTERLEAVED } },
 137         { { 0x73, 0x00, 0x14 }, 0x00, { ALPS_PROTO_V6, 0xff, 0xff, ALPS_DUALPOINT } },          /* Dell XT2 */
 138         { { 0x73, 0x02, 0x50 }, 0x00, { ALPS_PROTO_V2, 0xcf, 0xcf, ALPS_FOUR_BUTTONS } },       /* Dell Vostro 1400 */
 139         { { 0x52, 0x01, 0x14 }, 0x00, { ALPS_PROTO_V2, 0xff, 0xff,
 140                 ALPS_PASS | ALPS_DUALPOINT | ALPS_PS2_INTERLEAVED } },                          /* Toshiba Tecra A11-11L */
 141 };
 142
 143 static const struct alps_protocol_info alps_v3_protocol_data = {
 144         ALPS_PROTO_V3, 0x8f, 0x8f, ALPS_DUALPOINT
 145 };
 146
 147 static const struct alps_protocol_info alps_v3_rushmore_data = {
 148         ALPS_PROTO_V3_RUSHMORE, 0x8f, 0x8f, ALPS_DUALPOINT
 149 };
 150
 151 static const struct alps_protocol_info alps_v4_protocol_data = {
 152         ALPS_PROTO_V4, 0x8f, 0x8f, 0
 153 };
 154
 155 static const struct alps_protocol_info alps_v5_protocol_data = {
 156         ALPS_PROTO_V5, 0xc8, 0xd8, 0
 157 };
 158
 159 static const struct alps_protocol_info alps_v7_protocol_data = {
 160         ALPS_PROTO_V7, 0x48, 0x48, ALPS_DUALPOINT
 161 };
 162
 163 static const struct alps_protocol_info alps_v8_protocol_data = {
 164         ALPS_PROTO_V8, 0x18, 0x18, 0
 165 };
 166
 167 static const struct alps_protocol_info alps_v9_protocol_data = {
 168         ALPS_PROTO_V9, 0xc8, 0xc8, 0
 169 };
 170
 171 /*
 172  * Some v2 models report the stick buttons in separate bits
 173  */
 174 static const struct dmi_system_id alps_dmi_has_separate_stick_buttons[] = {
 175 #if defined(CONFIG_DMI) && defined(CONFIG_X86)
 176         {
 177                 /* Extrapolated from other entries */
 178                 .matches = {
 179                         DMI_MATCH(DMI_SYS_VENDOR, "Dell Inc."),
 180                         DMI_MATCH(DMI_PRODUCT_NAME, "Latitude D420"),
 181                 },
 182         },
 183         {
 184                 /* Reported-by: Hans de Bruin <jmdebruin@xmsnet.nl> */
 185                 .matches = {
 186                         DMI_MATCH(DMI_SYS_VENDOR, "Dell Inc."),
 187                         DMI_MATCH(DMI_PRODUCT_NAME, "Latitude D430"),
 188                 },
 189         },
 190         {
 191                 /* Reported-by: Hans de Goede <hdegoede@redhat.com> */
 192                 .matches = {
 193                         DMI_MATCH(DMI_SYS_VENDOR, "Dell Inc."),
 194                         DMI_MATCH(DMI_PRODUCT_NAME, "Latitude D620"),
 195                 },
 196         },
 197         {
 198                 /* Extrapolated from other entries */
 199                 .matches = {
 200                         DMI_MATCH(DMI_SYS_VENDOR, "Dell Inc."),
 201                         DMI_MATCH(DMI_PRODUCT_NAME, "Latitude D630"),
 202                 },
 203         },
 204 #endif
 205         { }
 206 };
 207
 208 static void alps_set_abs_params_st(struct alps_data *priv,
 209                                    struct input_dev *dev1);
 210 static void alps_set_abs_params_semi_mt(struct alps_data *priv,
 211                                         struct input_dev *dev1);
 212 static void alps_set_abs_params_v7(struct alps_data *priv,
 213                                    struct input_dev *dev1);
 214 static void alps_set_abs_params_ss4_v2(struct alps_data *priv,
 215                                        struct input_dev *dev1);
 216
 217 /* Packet formats are described in Documentation/input/alps.txt */
 218
 219 static bool alps_is_valid_first_byte(struct alps_data *priv,
 220                                      unsigned char data)
 221 {
 222         return (data & priv->mask0) == priv->byte0;
 223 }
 224
 225 static void alps_report_buttons(struct input_dev *dev1, struct input_dev *dev2,
 226                                 int left, int right, int middle)
 227 {
 228         struct input_dev *dev;
 229
 230         /*
 231          * If shared button has already been reported on the
 232          * other device (dev2) then this event should be also
 233          * sent through that device.
 234          */
 235         dev = (dev2 && test_bit(BTN_LEFT, dev2->key)) ? dev2 : dev1;
 236         input_report_key(dev, BTN_LEFT, left);
 237
 238         dev = (dev2 && test_bit(BTN_RIGHT, dev2->key)) ? dev2 : dev1;
 239         input_report_key(dev, BTN_RIGHT, right);
 240
 241         dev = (dev2 && test_bit(BTN_MIDDLE, dev2->key)) ? dev2 : dev1;
 242         input_report_key(dev, BTN_MIDDLE, middle);
 243
 244         /*
 245          * Sync the _other_ device now, we'll do the first
 246          * device later once we report the rest of the events.
 247          */
 248         if (dev2)
 249                 input_sync(dev2);
 250 }
 251
 252 static void alps_process_packet_v1_v2(struct psmouse *psmouse)
 253 {
 254         struct alps_data *priv = psmouse->private;
 255         unsigned char *packet = psmouse->packet;
 256         struct input_dev *dev = psmouse->dev;
 257         struct input_dev *dev2 = priv->dev2;
 258         int x, y, z, ges, fin, left, right, middle;
 259         int back = 0, forward = 0;
 260
 261         if (priv->proto_version == ALPS_PROTO_V1) {
 262                 left = packet[2] & 0x10;
 263                 right = packet[2] & 0x08;
 264                 middle = 0;
 265                 x = packet[1] | ((packet[0] & 0x07) << 7);
 266                 y = packet[4] | ((packet[3] & 0x07) << 7);
 267                 z = packet[5];
 268         } else {
 269                 left = packet[3] & 1;
 270                 right = packet[3] & 2;
 271                 middle = packet[3] & 4;
 272                 x = packet[1] | ((packet[2] & 0x78) << (7 - 3));
 273                 y = packet[4] | ((packet[3] & 0x70) << (7 - 4));
 274                 z = packet[5];
 275         }
 276
 277         if (priv->flags & ALPS_FW_BK_1) {
 278                 back = packet[0] & 0x10;
 279                 forward = packet[2] & 4;
 280         }
 281
 282         if (priv->flags & ALPS_FW_BK_2) {
 283                 back = packet[3] & 4;
 284                 forward = packet[2] & 4;
 285                 if ((middle = forward && back))
 286                         forward = back = 0;
 287         }
 288
 289         ges = packet[2] & 1;
 290         fin = packet[2] & 2;
 291
 292         if ((priv->flags & ALPS_DUALPOINT) && z == 127) {
 293                 input_report_rel(dev2, REL_X,  (x > 383 ? (x - 768) : x));
 294                 input_report_rel(dev2, REL_Y, -(y > 255 ? (y - 512) : y));
 295
 296                 alps_report_buttons(dev2, dev, left, right, middle);
 297
 298                 input_sync(dev2);
 299                 return;
 300         }
 301
 302         /* Some models have separate stick button bits */
 303         if (priv->flags & ALPS_STICK_BITS) {
 304                 left |= packet[0] & 1;
 305                 right |= packet[0] & 2;
 306                 middle |= packet[0] & 4;
 307         }
 308
 309         alps_report_buttons(dev, dev2, left, right, middle);
 310
 311         /* Convert hardware tap to a reasonable Z value */
 312         if (ges && !fin)
 313                 z = 40;
 314
 315         /*
 316          * A "tap and drag" operation is reported by the hardware as a transition
 317          * from (!fin && ges) to (fin && ges). This should be translated to the
 318          * sequence Z>0, Z==0, Z>0, so the Z==0 event has to be generated manually.
 319          */
 320         if (ges && fin && !priv->prev_fin) {
 321                 input_report_abs(dev, ABS_X, x);
 322                 input_report_abs(dev, ABS_Y, y);
 323                 input_report_abs(dev, ABS_PRESSURE, 0);
 324                 input_report_key(dev, BTN_TOOL_FINGER, 0);
 325                 input_sync(dev);
 326         }
 327         priv->prev_fin = fin;
 328
 329         if (z > 30)
 330                 input_report_key(dev, BTN_TOUCH, 1);
 331         if (z < 25)
 332                 input_report_key(dev, BTN_TOUCH, 0);
 333
 334         if (z > 0) {
 335                 input_report_abs(dev, ABS_X, x);
 336                 input_report_abs(dev, ABS_Y, y);
 337         }
 338
 339         input_report_abs(dev, ABS_PRESSURE, z);
 340         input_report_key(dev, BTN_TOOL_FINGER, z > 0);
 341
 342         if (priv->flags & ALPS_WHEEL)
 343                 input_report_rel(dev, REL_WHEEL, ((packet[2] << 1) & 0x08) - ((packet[0] >> 4) & 0x07));
 344
 345         if (priv->flags & (ALPS_FW_BK_1 | ALPS_FW_BK_2)) {
 346                 input_report_key(dev, BTN_FORWARD, forward);
 347                 input_report_key(dev, BTN_BACK, back);
 348         }
 349
 350         if (priv->flags & ALPS_FOUR_BUTTONS) {
 351                 input_report_key(dev, BTN_0, packet[2] & 4);
 352                 input_report_key(dev, BTN_1, packet[0] & 0x10);
 353                 input_report_key(dev, BTN_2, packet[3] & 4);
 354                 input_report_key(dev, BTN_3, packet[0] & 0x20);
 355         }
 356
 357         input_sync(dev);
 358 }
 359
 360 static void alps_get_bitmap_points(unsigned int map,
 361                                    struct alps_bitmap_point *low,
 362                                    struct alps_bitmap_point *high,
 363                                    int *fingers)
 364 {
 365         struct alps_bitmap_point *point;
 366         int i, bit, prev_bit = 0;
 367
 368         point = low;
 369         for (i = 0; map != 0; i++, map >>= 1) {
 370                 bit = map & 1;
 371                 if (bit) {
 372                         if (!prev_bit) {
 373                                 point->start_bit = i;
 374                                 point->num_bits = 0;
 375                                 (*fingers)++;
 376                         }
 377                         point->num_bits++;
 378                 } else {
 379                         if (prev_bit)
 380                                 point = high;
 381                 }
 382                 prev_bit = bit;
 383         }
 384 }
 385
 386 /*
 387  * Process bitmap data from semi-mt protocols. Returns the number of
 388  * fingers detected. A return value of 0 means at least one of the
 389  * bitmaps was empty.
 390  *
 391  * The bitmaps don't have enough data to track fingers, so this function
 392  * only generates points representing a bounding box of all contacts.
 393  * These points are returned in fields->mt when the return value
 394  * is greater than 0.
 395  */
 396 static int alps_process_bitmap(struct alps_data *priv,
 397                                struct alps_fields *fields)
 398 {
 399         int i, fingers_x = 0, fingers_y = 0, fingers, closest;
 400         struct alps_bitmap_point x_low = {0,}, x_high = {0,};
 401         struct alps_bitmap_point y_low = {0,}, y_high = {0,};
 402         struct input_mt_pos corner[4];
 403
 404         if (!fields->x_map || !fields->y_map)
 405                 return 0;
 406
 407         alps_get_bitmap_points(fields->x_map, &x_low, &x_high, &fingers_x);
 408         alps_get_bitmap_points(fields->y_map, &y_low, &y_high, &fingers_y);
 409
 410         /*
 411          * Fingers can overlap, so we use the maximum count of fingers
 412          * on either axis as the finger count.
 413          */
 414         fingers = max(fingers_x, fingers_y);
 415
 416         /*
 417          * If an axis reports only a single contact, we have overlapping or
 418          * adjacent fingers. Divide the single contact between the two points.
 419          */
 420         if (fingers_x == 1) {
 421                 i = (x_low.num_bits - 1) / 2;
 422                 x_low.num_bits = x_low.num_bits - i;
 423                 x_high.start_bit = x_low.start_bit + i;
 424                 x_high.num_bits = max(i, 1);
 425         }
 426         if (fingers_y == 1) {
 427                 i = (y_low.num_bits - 1) / 2;
 428                 y_low.num_bits = y_low.num_bits - i;
 429                 y_high.start_bit = y_low.start_bit + i;
 430                 y_high.num_bits = max(i, 1);
 431         }
 432
 433         /* top-left corner */
 434         corner[0].x =
 435                 (priv->x_max * (2 * x_low.start_bit + x_low.num_bits - 1)) /
 436                 (2 * (priv->x_bits - 1));
 437         corner[0].y =
 438                 (priv->y_max * (2 * y_low.start_bit + y_low.num_bits - 1)) /
 439                 (2 * (priv->y_bits - 1));
 440
 441         /* top-right corner */
 442         corner[1].x =
 443                 (priv->x_max * (2 * x_high.start_bit + x_high.num_bits - 1)) /
 444                 (2 * (priv->x_bits - 1));
 445         corner[1].y =
 446                 (priv->y_max * (2 * y_low.start_bit + y_low.num_bits - 1)) /
 447                 (2 * (priv->y_bits - 1));
 448
 449         /* bottom-right corner */
 450         corner[2].x =
 451                 (priv->x_max * (2 * x_high.start_bit + x_high.num_bits - 1)) /
 452                 (2 * (priv->x_bits - 1));
 453         corner[2].y =
 454                 (priv->y_max * (2 * y_high.start_bit + y_high.num_bits - 1)) /
 455                 (2 * (priv->y_bits - 1));
 456
 457         /* bottom-left corner */
 458         corner[3].x =
 459                 (priv->x_max * (2 * x_low.start_bit + x_low.num_bits - 1)) /
 460                 (2 * (priv->x_bits - 1));
 461         corner[3].y =
 462                 (priv->y_max * (2 * y_high.start_bit + y_high.num_bits - 1)) /
 463                 (2 * (priv->y_bits - 1));
 464
 465         /* x-bitmap order is reversed on v5 touchpads  */
 466         if (priv->proto_version == ALPS_PROTO_V5) {
 467                 for (i = 0; i < 4; i++)
 468                         corner[i].x = priv->x_max - corner[i].x;
 469         }
 470
 471         /* y-bitmap order is reversed on v3 and v4 touchpads  */
 472         if (priv->proto_version == ALPS_PROTO_V3 ||
 473             priv->proto_version == ALPS_PROTO_V4) {
 474                 for (i = 0; i < 4; i++)
 475                         corner[i].y = priv->y_max - corner[i].y;
 476         }
 477
 478         /*
 479          * We only select a corner for the second touch once per 2 finger
 480          * touch sequence to avoid the chosen corner (and thus the coordinates)
 481          * jumping around when the first touch is in the middle.
 482          */
 483         if (priv->second_touch == -1) {
 484                 /* Find corner closest to our st coordinates */
 485                 closest = 0x7fffffff;
 486                 for (i = 0; i < 4; i++) {
 487                         int dx = fields->st.x - corner[i].x;
 488                         int dy = fields->st.y - corner[i].y;
 489                         int distance = dx * dx + dy * dy;
 490
 491                         if (distance < closest) {
 492                                 priv->second_touch = i;
 493                                 closest = distance;
 494                         }
 495                 }
 496                 /* And select the opposite corner to use for the 2nd touch */
 497                 priv->second_touch = (priv->second_touch + 2) % 4;
 498         }
 499
 500         fields->mt[0] = fields->st;
 501         fields->mt[1] = corner[priv->second_touch];
 502
 503         return fingers;
 504 }
 505
 506 static void alps_set_slot(struct input_dev *dev, int slot, int x, int y)
 507 {
 508         input_mt_slot(dev, slot);
 509         input_mt_report_slot_state(dev, MT_TOOL_FINGER, true);
 510         input_report_abs(dev, ABS_MT_POSITION_X, x);
 511         input_report_abs(dev, ABS_MT_POSITION_Y, y);
 512 }
 513
 514 static void alps_report_mt_data(struct psmouse *psmouse, int n)
 515 {
 516         struct alps_data *priv = psmouse->private;
 517         struct input_dev *dev = psmouse->dev;
 518         struct alps_fields *f = &priv->f;
 519         int i, slot[MAX_TOUCHES];
 520
 521         input_mt_assign_slots(dev, slot, f->mt, n, 0);
 522         for (i = 0; i < n; i++)
 523                 alps_set_slot(dev, slot[i], f->mt[i].x, f->mt[i].y);
 524
 525         input_mt_sync_frame(dev);
 526 }
 527
 528 static void alps_report_semi_mt_data(struct psmouse *psmouse, int fingers)
 529 {
 530         struct alps_data *priv = psmouse->private;
 531         struct input_dev *dev = psmouse->dev;
 532         struct alps_fields *f = &priv->f;
 533
 534         /* Use st data when we don't have mt data */
 535         if (fingers < 2) {
 536                 f->mt[0].x = f->st.x;
 537                 f->mt[0].y = f->st.y;
 538                 fingers = f->pressure > 0 ? 1 : 0;
 539                 priv->second_touch = -1;
 540         }
 541
 542         if (fingers >= 1)
 543                 alps_set_slot(dev, 0, f->mt[0].x, f->mt[0].y);
 544         if (fingers >= 2)
 545                 alps_set_slot(dev, 1, f->mt[1].x, f->mt[1].y);
 546         input_mt_sync_frame(dev);
 547
 548         input_mt_report_finger_count(dev, fingers);
 549
 550         input_report_key(dev, BTN_LEFT, f->left);
 551         input_report_key(dev, BTN_RIGHT, f->right);
 552         input_report_key(dev, BTN_MIDDLE, f->middle);
 553
 554         input_report_abs(dev, ABS_PRESSURE, f->pressure);
 555
 556         input_sync(dev);
 557 }
 558
 559 static void alps_process_trackstick_packet_v3(struct psmouse *psmouse)
 560 {
 561         struct alps_data *priv = psmouse->private;
 562         unsigned char *packet = psmouse->packet;
 563         struct input_dev *dev = priv->dev2;
 564         int x, y, z, left, right, middle;
 565
 566         /* It should be a DualPoint when received trackstick packet */
 567         if (!(priv->flags & ALPS_DUALPOINT)) {
 568                 psmouse_warn(psmouse,
 569                              "Rejected trackstick packet from non DualPoint device");
 570                 return;
 571         }
 572
 573         /* Sanity check packet */
 574         if (!(packet[0] & 0x40)) {
 575                 psmouse_dbg(psmouse, "Bad trackstick packet, discarding\n");
 576                 return;
 577         }
 578
 579         /*
 580          * There's a special packet that seems to indicate the end
 581          * of a stream of trackstick data. Filter these out.
 582          */
 583         if (packet[1] == 0x7f && packet[2] == 0x7f && packet[4] == 0x7f)
 584                 return;
 585
 586         x = (s8)(((packet[0] & 0x20) << 2) | (packet[1] & 0x7f));
 587         y = (s8)(((packet[0] & 0x10) << 3) | (packet[2] & 0x7f));
 588         z = (packet[4] & 0x7c) >> 2;
 589
 590         /*
 591          * The x and y values tend to be quite large, and when used
 592          * alone the trackstick is difficult to use. Scale them down
 593          * to compensate.
 594          */
 595         x /= 8;
 596         y /= 8;
 597
 598         input_report_rel(dev, REL_X, x);
 599         input_report_rel(dev, REL_Y, -y);
 600
 601         /*
 602          * Most ALPS models report the trackstick buttons in the touchpad
 603          * packets, but a few report them here. No reliable way has been
 604          * found to differentiate between the models upfront, so we enable
 605          * the quirk in response to seeing a button press in the trackstick
 606          * packet.
 607          */
 608         left = packet[3] & 0x01;
 609         right = packet[3] & 0x02;
 610         middle = packet[3] & 0x04;
 611
 612         if (!(priv->quirks & ALPS_QUIRK_TRACKSTICK_BUTTONS) &&
 613             (left || right || middle))
 614                 priv->quirks |= ALPS_QUIRK_TRACKSTICK_BUTTONS;
 615
 616         if (priv->quirks & ALPS_QUIRK_TRACKSTICK_BUTTONS) {
 617                 input_report_key(dev, BTN_LEFT, left);
 618                 input_report_key(dev, BTN_RIGHT, right);
 619                 input_report_key(dev, BTN_MIDDLE, middle);
 620         }
 621
 622         input_sync(dev);
 623         return;
 624 }
 625
 626 static void alps_decode_buttons_v3(struct alps_fields *f, unsigned char *p)
 627 {
 628         f->left = !!(p[3] & 0x01);
 629         f->right = !!(p[3] & 0x02);
 630         f->middle = !!(p[3] & 0x04);
 631
 632         f->ts_left = !!(p[3] & 0x10);
 633         f->ts_right = !!(p[3] & 0x20);
 634         f->ts_middle = !!(p[3] & 0x40);
 635 }
 636
 637 static int alps_decode_pinnacle(struct alps_fields *f, unsigned char *p,
 638                                  struct psmouse *psmouse)
 639 {
 640         f->first_mp = !!(p[4] & 0x40);
 641         f->is_mp = !!(p[0] & 0x40);
 642
 643         if (f->is_mp) {
 644                 f->fingers = (p[5] & 0x3) + 1;
 645                 f->x_map = ((p[4] & 0x7e) << 8) |
 646                            ((p[1] & 0x7f) << 2) |
 647                            ((p[0] & 0x30) >> 4);
 648                 f->y_map = ((p[3] & 0x70) << 4) |
 649                            ((p[2] & 0x7f) << 1) |
 650                            (p[4] & 0x01);
 651         } else {
 652                 f->st.x = ((p[1] & 0x7f) << 4) | ((p[4] & 0x30) >> 2) |
 653                        ((p[0] & 0x30) >> 4);
 654                 f->st.y = ((p[2] & 0x7f) << 4) | (p[4] & 0x0f);
 655                 f->pressure = p[5] & 0x7f;
 656
 657                 alps_decode_buttons_v3(f, p);
 658         }
 659
 660         return 0;
 661 }
 662
 663 static int alps_decode_rushmore(struct alps_fields *f, unsigned char *p,
 664                                  struct psmouse *psmouse)
 665 {
 666         f->first_mp = !!(p[4] & 0x40);
 667         f->is_mp = !!(p[5] & 0x40);
 668
 669         if (f->is_mp) {
 670                 f->fingers = max((p[5] & 0x3), ((p[5] >> 2) & 0x3)) + 1;
 671                 f->x_map = ((p[5] & 0x10) << 11) |
 672                            ((p[4] & 0x7e) << 8) |
 673                            ((p[1] & 0x7f) << 2) |
 674                            ((p[0] & 0x30) >> 4);
 675                 f->y_map = ((p[5] & 0x20) << 6) |
 676                            ((p[3] & 0x70) << 4) |
 677                            ((p[2] & 0x7f) << 1) |
 678                            (p[4] & 0x01);
 679         } else {
 680                 f->st.x = ((p[1] & 0x7f) << 4) | ((p[4] & 0x30) >> 2) |
 681                        ((p[0] & 0x30) >> 4);
 682                 f->st.y = ((p[2] & 0x7f) << 4) | (p[4] & 0x0f);
 683                 f->pressure = p[5] & 0x7f;
 684
 685                 alps_decode_buttons_v3(f, p);
 686         }
 687
 688         return 0;
 689 }
 690
 691 static int alps_decode_dolphin(struct alps_fields *f, unsigned char *p,
 692                                 struct psmouse *psmouse)
 693 {
 694         u64 palm_data = 0;
 695         struct alps_data *priv = psmouse->private;
 696
 697         f->first_mp = !!(p[0] & 0x02);
 698         f->is_mp = !!(p[0] & 0x20);
 699
 700         if (!f->is_mp) {
 701                 f->st.x = ((p[1] & 0x7f) | ((p[4] & 0x0f) << 7));
 702                 f->st.y = ((p[2] & 0x7f) | ((p[4] & 0xf0) << 3));
 703                 f->pressure = (p[0] & 4) ? 0 : p[5] & 0x7f;
 704                 alps_decode_buttons_v3(f, p);
 705         } else {
 706                 f->fingers = ((p[0] & 0x6) >> 1 |
 707                      (p[0] & 0x10) >> 2);
 708
 709                 palm_data = (p[1] & 0x7f) |
 710                             ((p[2] & 0x7f) << 7) |
 711                             ((p[4] & 0x7f) << 14) |
 712                             ((p[5] & 0x7f) << 21) |
 713                             ((p[3] & 0x07) << 28) |
 714                             (((u64)p[3] & 0x70) << 27) |
 715                             (((u64)p[0] & 0x01) << 34);
 716
 717                 /* Y-profile is stored in P(0) to p(n-1), n = y_bits; */
 718                 f->y_map = palm_data & (BIT(priv->y_bits) - 1);
 719
 720                 /* X-profile is stored in p(n) to p(n+m-1), m = x_bits; */
 721                 f->x_map = (palm_data >> priv->y_bits) &
 722                            (BIT(priv->x_bits) - 1);
 723         }
 724
 725         return 0;
 726 }
 727
 728 static void alps_process_touchpad_packet_v3_v5(struct psmouse *psmouse)
 729 {
 730         struct alps_data *priv = psmouse->private;
 731         unsigned char *packet = psmouse->packet;
 732         struct input_dev *dev2 = priv->dev2;
 733         struct alps_fields *f = &priv->f;
 734         int fingers = 0;
 735
 736         memset(f, 0, sizeof(*f));
 737
 738         priv->decode_fields(f, packet, psmouse);
 739
 740         /*
 741          * There's no single feature of touchpad position and bitmap packets
 742          * that can be used to distinguish between them. We rely on the fact
 743          * that a bitmap packet should always follow a position packet with
 744          * bit 6 of packet[4] set.
 745          */
 746         if (priv->multi_packet) {
 747                 /*
 748                  * Sometimes a position packet will indicate a multi-packet
 749                  * sequence, but then what follows is another position
 750                  * packet. Check for this, and when it happens process the
 751                  * position packet as usual.
 752                  */
 753                 if (f->is_mp) {
 754                         fingers = f->fingers;
 755                         /*
 756                          * Bitmap processing uses position packet's coordinate
 757                          * data, so we need to do decode it first.
 758                          */
 759                         priv->decode_fields(f, priv->multi_data, psmouse);
 760                         if (alps_process_bitmap(priv, f) == 0)
 761                                 fingers = 0; /* Use st data */
 762                 } else {
 763                         priv->multi_packet = 0;
 764                 }
 765         }
 766
 767         /*
 768          * Bit 6 of byte 0 is not usually set in position packets. The only
 769          * times it seems to be set is in situations where the data is
 770          * suspect anyway, e.g. a palm resting flat on the touchpad. Given
 771          * this combined with the fact that this bit is useful for filtering
 772          * out misidentified bitmap packets, we reject anything with this
 773          * bit set.
 774          */
 775         if (f->is_mp)
 776                 return;
 777
 778         if (!priv->multi_packet && f->first_mp) {
 779                 priv->multi_packet = 1;
 780                 memcpy(priv->multi_data, packet, sizeof(priv->multi_data));
 781                 return;
 782         }
 783
 784         priv->multi_packet = 0;
 785
 786         /*
 787          * Sometimes the hardware sends a single packet with z = 0
 788          * in the middle of a stream. Real releases generate packets
 789          * with x, y, and z all zero, so these seem to be flukes.
 790          * Ignore them.
 791          */
 792         if (f->st.x && f->st.y && !f->pressure)
 793                 return;
 794
 795         alps_report_semi_mt_data(psmouse, fingers);
 796
 797         if ((priv->flags & ALPS_DUALPOINT) &&
 798             !(priv->quirks & ALPS_QUIRK_TRACKSTICK_BUTTONS)) {
 799                 input_report_key(dev2, BTN_LEFT, f->ts_left);
 800                 input_report_key(dev2, BTN_RIGHT, f->ts_right);
 801                 input_report_key(dev2, BTN_MIDDLE, f->ts_middle);
 802                 input_sync(dev2);
 803         }
 804 }
 805
 806 static void alps_process_packet_v3(struct psmouse *psmouse)
 807 {
 808         unsigned char *packet = psmouse->packet;
 809
 810         /*
 811          * v3 protocol packets come in three types, two representing
 812          * touchpad data and one representing trackstick data.
 813          * Trackstick packets seem to be distinguished by always
 814          * having 0x3f in the last byte. This value has never been
 815          * observed in the last byte of either of the other types
 816          * of packets.
 817          */
 818         if (packet[5] == 0x3f) {
 819                 alps_process_trackstick_packet_v3(psmouse);
 820                 return;
 821         }
 822
 823         alps_process_touchpad_packet_v3_v5(psmouse);
 824 }
 825
 826 static void alps_process_packet_v6(struct psmouse *psmouse)
 827 {
 828         struct alps_data *priv = psmouse->private;
 829         unsigned char *packet = psmouse->packet;
 830         struct input_dev *dev = psmouse->dev;
 831         struct input_dev *dev2 = priv->dev2;
 832         int x, y, z, left, right, middle;
 833
 834         /*
 835          * We can use Byte5 to distinguish if the packet is from Touchpad
 836          * or Trackpoint.
 837          * Touchpad:    0 - 0x7E
 838          * Trackpoint:  0x7F
 839          */
 840         if (packet[5] == 0x7F) {
 841                 /* It should be a DualPoint when received Trackpoint packet */
 842                 if (!(priv->flags & ALPS_DUALPOINT)) {
 843                         psmouse_warn(psmouse,
 844                                      "Rejected trackstick packet from non DualPoint device");
 845                         return;
 846                 }
 847
 848                 /* Trackpoint packet */
 849                 x = packet[1] | ((packet[3] & 0x20) << 2);
 850                 y = packet[2] | ((packet[3] & 0x40) << 1);
 851                 z = packet[4];
 852                 left = packet[3] & 0x01;
 853                 right = packet[3] & 0x02;
 854                 middle = packet[3] & 0x04;
 855
 856                 /* To prevent the cursor jump when finger lifted */
 857                 if (x == 0x7F && y == 0x7F && z == 0x7F)
 858                         x = y = z = 0;
 859
 860                 /* Divide 4 since trackpoint's speed is too fast */
 861                 input_report_rel(dev2, REL_X, (char)x / 4);
 862                 input_report_rel(dev2, REL_Y, -((char)y / 4));
 863
 864                 input_report_key(dev2, BTN_LEFT, left);
 865                 input_report_key(dev2, BTN_RIGHT, right);
 866                 input_report_key(dev2, BTN_MIDDLE, middle);
 867
 868                 input_sync(dev2);
 869                 return;
 870         }
 871
 872         /* Touchpad packet */
 873         x = packet[1] | ((packet[3] & 0x78) << 4);
 874         y = packet[2] | ((packet[4] & 0x78) << 4);
 875         z = packet[5];
 876         left = packet[3] & 0x01;
 877         right = packet[3] & 0x02;
 878
 879         if (z > 30)
 880                 input_report_key(dev, BTN_TOUCH, 1);
 881         if (z < 25)
 882                 input_report_key(dev, BTN_TOUCH, 0);
 883
 884         if (z > 0) {
 885                 input_report_abs(dev, ABS_X, x);
 886                 input_report_abs(dev, ABS_Y, y);
 887         }
 888
 889         input_report_abs(dev, ABS_PRESSURE, z);
 890         input_report_key(dev, BTN_TOOL_FINGER, z > 0);
 891
 892         /* v6 touchpad does not have middle button */
 893         input_report_key(dev, BTN_LEFT, left);
 894         input_report_key(dev, BTN_RIGHT, right);
 895
 896         input_sync(dev);
 897 }
 898
 899 static void alps_process_packet_v4(struct psmouse *psmouse)
 900 {
 901         struct alps_data *priv = psmouse->private;
 902         unsigned char *packet = psmouse->packet;
 903         struct alps_fields *f = &priv->f;
 904         int offset;
 905
 906         /*
 907          * v4 has a 6-byte encoding for bitmap data, but this data is
 908          * broken up between 3 normal packets. Use priv->multi_packet to
 909          * track our position in the bitmap packet.
 910          */
 911         if (packet[6] & 0x40) {
 912                 /* sync, reset position */
 913                 priv->multi_packet = 0;
 914         }
 915
 916         if (WARN_ON_ONCE(priv->multi_packet > 2))
 917                 return;
 918
 919         offset = 2 * priv->multi_packet;
 920         priv->multi_data[offset] = packet[6];
 921         priv->multi_data[offset + 1] = packet[7];
 922
 923         f->left = !!(packet[4] & 0x01);
 924         f->right = !!(packet[4] & 0x02);
 925
 926         f->st.x = ((packet[1] & 0x7f) << 4) | ((packet[3] & 0x30) >> 2) |
 927                   ((packet[0] & 0x30) >> 4);
 928         f->st.y = ((packet[2] & 0x7f) << 4) | (packet[3] & 0x0f);
 929         f->pressure = packet[5] & 0x7f;
 930
 931         if (++priv->multi_packet > 2) {
 932                 priv->multi_packet = 0;
 933
 934                 f->x_map = ((priv->multi_data[2] & 0x1f) << 10) |
 935                            ((priv->multi_data[3] & 0x60) << 3) |
 936                            ((priv->multi_data[0] & 0x3f) << 2) |
 937                            ((priv->multi_data[1] & 0x60) >> 5);
 938                 f->y_map = ((priv->multi_data[5] & 0x01) << 10) |
 939                            ((priv->multi_data[3] & 0x1f) << 5) |
 940                             (priv->multi_data[1] & 0x1f);
 941
 942                 f->fingers = alps_process_bitmap(priv, f);
 943         }
 944
 945         alps_report_semi_mt_data(psmouse, f->fingers);
 946 }
 947
 948 static bool alps_is_valid_package_v7(struct psmouse *psmouse)
 949 {
 950         switch (psmouse->pktcnt) {
 951         case 3:
 952                 return (psmouse->packet[2] & 0x40) == 0x40;
 953         case 4:
 954                 return (psmouse->packet[3] & 0x48) == 0x48;
 955         case 6:
 956                 return (psmouse->packet[5] & 0x40) == 0x00;
 957         }
 958         return true;
 959 }
 960
 961 static unsigned char alps_get_packet_id_v7(char *byte)
 962 {
 963         unsigned char packet_id;
 964
 965         if (byte[4] & 0x40)
 966                 packet_id = V7_PACKET_ID_TWO;
 967         else if (byte[4] & 0x01)
 968                 packet_id = V7_PACKET_ID_MULTI;
 969         else if ((byte[0] & 0x10) && !(byte[4] & 0x43))
 970                 packet_id = V7_PACKET_ID_NEW;
 971         else if (byte[1] == 0x00 && byte[4] == 0x00)
 972                 packet_id = V7_PACKET_ID_IDLE;
 973         else
 974                 packet_id = V7_PACKET_ID_UNKNOWN;
 975
 976         return packet_id;
 977 }
 978
 979 static void alps_get_finger_coordinate_v7(struct input_mt_pos *mt,
 980                                           unsigned char *pkt,
 981                                           unsigned char pkt_id)
 982 {
 983         mt[0].x = ((pkt[2] & 0x80) << 4);
 984         mt[0].x |= ((pkt[2] & 0x3F) << 5);
 985         mt[0].x |= ((pkt[3] & 0x30) >> 1);
 986         mt[0].x |= (pkt[3] & 0x07);
 987         mt[0].y = (pkt[1] << 3) | (pkt[0] & 0x07);
 988
 989         mt[1].x = ((pkt[3] & 0x80) << 4);
 990         mt[1].x |= ((pkt[4] & 0x80) << 3);
 991         mt[1].x |= ((pkt[4] & 0x3F) << 4);
 992         mt[1].y = ((pkt[5] & 0x80) << 3);
 993         mt[1].y |= ((pkt[5] & 0x3F) << 4);
 994
 995         switch (pkt_id) {
 996         case V7_PACKET_ID_TWO:
 997                 mt[1].x &= ~0x000F;
 998                 mt[1].y |= 0x000F;
 999                 /* Detect false-postive touches where x & y report max value */
1000                 if (mt[1].y == 0x7ff && mt[1].x == 0xff0) {
1001                         mt[1].x = 0;
1002                         /* y gets set to 0 at the end of this function */
1003                 }
1004                 break;
1005
1006         case V7_PACKET_ID_MULTI:
1007                 mt[1].x &= ~0x003F;
1008                 mt[1].y &= ~0x0020;
1009                 mt[1].y |= ((pkt[4] & 0x02) << 4);
1010                 mt[1].y |= 0x001F;
1011                 break;
1012
1013         case V7_PACKET_ID_NEW:
1014                 mt[1].x &= ~0x003F;
1015                 mt[1].x |= (pkt[0] & 0x20);
1016                 mt[1].y |= 0x000F;
1017                 break;
1018         }
1019
1020         mt[0].y = 0x7FF - mt[0].y;
1021         mt[1].y = 0x7FF - mt[1].y;
1022 }
1023
1024 static int alps_get_mt_count(struct input_mt_pos *mt)
1025 {
1026         int i, fingers = 0;
1027
1028         for (i = 0; i < MAX_TOUCHES; i++) {
1029                 if (mt[i].x != 0 || mt[i].y != 0)
1030                         fingers++;
1031         }
1032
1033         return fingers;
1034 }
1035
1036 static int alps_decode_packet_v7(struct alps_fields *f,
1037                                   unsigned char *p,
1038                                   struct psmouse *psmouse)
1039 {
1040         struct alps_data *priv = psmouse->private;
1041         unsigned char pkt_id;
1042
1043         pkt_id = alps_get_packet_id_v7(p);
1044         if (pkt_id == V7_PACKET_ID_IDLE)
1045                 return 0;
1046         if (pkt_id == V7_PACKET_ID_UNKNOWN)
1047                 return -1;
1048         /*
1049          * NEW packets are send to indicate a discontinuity in the finger
1050          * coordinate reporting. Specifically a finger may have moved from
1051          * slot 0 to 1 or vice versa. INPUT_MT_TRACK takes care of this for
1052          * us.
1053          *
1054          * NEW packets have 3 problems:
1055          * 1) They do not contain middle / right button info (on non clickpads)
1056          *    this can be worked around by preserving the old button state
1057          * 2) They do not contain an accurate fingercount, and they are
1058          *    typically send when the number of fingers changes. We cannot use
1059          *    the old finger count as that may mismatch with the amount of
1060          *    touch coordinates we've available in the NEW packet
1061          * 3) Their x data for the second touch is inaccurate leading to
1062          *    a possible jump of the x coordinate by 16 units when the first
1063          *    non NEW packet comes in
1064          * Since problems 2 & 3 cannot be worked around, just ignore them.
1065          */
1066         if (pkt_id == V7_PACKET_ID_NEW)
1067                 return 1;
1068
1069         alps_get_finger_coordinate_v7(f->mt, p, pkt_id);
1070
1071         if (pkt_id == V7_PACKET_ID_TWO)
1072                 f->fingers = alps_get_mt_count(f->mt);
1073         else /* pkt_id == V7_PACKET_ID_MULTI */
1074                 f->fingers = 3 + (p[5] & 0x03);
1075
1076         f->left = (p[0] & 0x80) >> 7;
1077         if (priv->flags & ALPS_BUTTONPAD) {
1078                 if (p[0] & 0x20)
1079                         f->fingers++;
1080                 if (p[0] & 0x10)
1081                         f->fingers++;
1082         } else {
1083                 f->right = (p[0] & 0x20) >> 5;
1084                 f->middle = (p[0] & 0x10) >> 4;
1085         }
1086
1087         /* Sometimes a single touch is reported in mt[1] rather then mt[0] */
1088         if (f->fingers == 1 && f->mt[0].x == 0 && f->mt[0].y == 0) {
1089                 f->mt[0].x = f->mt[1].x;
1090                 f->mt[0].y = f->mt[1].y;
1091                 f->mt[1].x = 0;
1092                 f->mt[1].y = 0;
1093         }
1094
1095         return 0;
1096 }
1097
1098 static void alps_process_trackstick_packet_v7(struct psmouse *psmouse)
1099 {
1100         struct alps_data *priv = psmouse->private;
1101         unsigned char *packet = psmouse->packet;
1102         struct input_dev *dev2 = priv->dev2;
1103         int x, y, z, left, right, middle;
1104
1105         /* It should be a DualPoint when received trackstick packet */
1106         if (!(priv->flags & ALPS_DUALPOINT)) {
1107                 psmouse_warn(psmouse,
1108                              "Rejected trackstick packet from non DualPoint device");
1109                 return;
1110         }
1111
1112         x = ((packet[2] & 0xbf)) | ((packet[3] & 0x10) << 2);
1113         y = (packet[3] & 0x07) | (packet[4] & 0xb8) |
1114             ((packet[3] & 0x20) << 1);
1115         z = (packet[5] & 0x3f) | ((packet[3] & 0x80) >> 1);
1116
1117         left = (packet[1] & 0x01);
1118         right = (packet[1] & 0x02) >> 1;
1119         middle = (packet[1] & 0x04) >> 2;
1120
1121         input_report_rel(dev2, REL_X, (char)x);
1122         input_report_rel(dev2, REL_Y, -((char)y));
1123
1124         input_report_key(dev2, BTN_LEFT, left);
1125         input_report_key(dev2, BTN_RIGHT, right);
1126         input_report_key(dev2, BTN_MIDDLE, middle);
1127
1128         input_sync(dev2);
1129 }
1130
1131 static void alps_process_touchpad_packet_v7(struct psmouse *psmouse)
1132 {
1133         struct alps_data *priv = psmouse->private;
1134         struct input_dev *dev = psmouse->dev;
1135         struct alps_fields *f = &priv->f;
1136
1137         memset(f, 0, sizeof(*f));
1138
1139         if (priv->decode_fields(f, psmouse->packet, psmouse))
1140                 return;
1141
1142         alps_report_mt_data(psmouse, alps_get_mt_count(f->mt));
1143
1144         input_mt_report_finger_count(dev, f->fingers);
1145
1146         input_report_key(dev, BTN_LEFT, f->left);
1147         input_report_key(dev, BTN_RIGHT, f->right);
1148         input_report_key(dev, BTN_MIDDLE, f->middle);
1149
1150         input_sync(dev);
1151 }
1152
1153 static void alps_process_packet_v7(struct psmouse *psmouse)
1154 {
1155         unsigned char *packet = psmouse->packet;
1156
1157         if (packet[0] == 0x48 && (packet[4] & 0x47) == 0x06)
1158                 alps_process_trackstick_packet_v7(psmouse);
1159         else
1160                 alps_process_touchpad_packet_v7(psmouse);
1161 }
1162
1163 static enum SS4_PACKET_ID alps_get_pkt_id_ss4_v2(unsigned char *byte)
1164 {
1165         enum SS4_PACKET_ID pkt_id = SS4_PACKET_ID_IDLE;
1166
1167         switch (byte[3] & 0x30) {
1168         case 0x00:
1169                 if (SS4_IS_IDLE_V2(byte)) {
1170                         pkt_id = SS4_PACKET_ID_IDLE;
1171                 } else {
1172                         pkt_id = SS4_PACKET_ID_ONE;
1173                 }
1174                 break;
1175         case 0x10:
1176                 /* two-finger finger positions */
1177                 pkt_id = SS4_PACKET_ID_TWO;
1178                 break;
1179         case 0x20:
1180                 /* stick pointer */
1181                 pkt_id = SS4_PACKET_ID_STICK;
1182                 break;
1183         case 0x30:
1184                 /* third and fourth finger positions */
1185                 pkt_id = SS4_PACKET_ID_MULTI;
1186                 break;
1187         }
1188
1189         return pkt_id;
1190 }
1191
1192 static int alps_decode_ss4_v2(struct alps_fields *f,
1193                               unsigned char *p, struct psmouse *psmouse)
1194 {
1195         struct alps_data *priv = psmouse->private;
1196         enum SS4_PACKET_ID pkt_id;
1197         unsigned int no_data_x, no_data_y;
1198
1199         pkt_id = alps_get_pkt_id_ss4_v2(p);
1200
1201         /* Current packet is 1Finger coordinate packet */
1202         switch (pkt_id) {
1203         case SS4_PACKET_ID_ONE:
1204                 f->mt[0].x = SS4_1F_X_V2(p);
1205                 f->mt[0].y = SS4_1F_Y_V2(p);
1206                 f->pressure = ((SS4_1F_Z_V2(p)) * 2) & 0x7f;
1207                 /*
1208                  * When a button is held the device will give us events
1209                  * with x, y, and pressure of 0. This causes annoying jumps
1210                  * if a touch is released while the button is held.
1211                  * Handle this by claiming zero contacts.
1212                  */
1213                 f->fingers = f->pressure > 0 ? 1 : 0;
1214                 f->first_mp = 0;
1215                 f->is_mp = 0;
1216                 break;
1217
1218         case SS4_PACKET_ID_TWO:
1219                 if (priv->flags & ALPS_BUTTONPAD) {
1220                         f->mt[0].x = SS4_BTL_MF_X_V2(p, 0);
1221                         f->mt[0].y = SS4_BTL_MF_Y_V2(p, 0);
1222                         f->mt[1].x = SS4_BTL_MF_X_V2(p, 1);
1223                         f->mt[1].y = SS4_BTL_MF_Y_V2(p, 1);
1224                 } else {
1225                         f->mt[0].x = SS4_STD_MF_X_V2(p, 0);
1226                         f->mt[0].y = SS4_STD_MF_Y_V2(p, 0);
1227                         f->mt[1].x = SS4_STD_MF_X_V2(p, 1);
1228                         f->mt[1].y = SS4_STD_MF_Y_V2(p, 1);
1229                 }
1230                 f->pressure = SS4_MF_Z_V2(p, 0) ? 0x30 : 0;
1231
1232                 if (SS4_IS_MF_CONTINUE(p)) {
1233                         f->first_mp = 1;
1234                 } else {
1235                         f->fingers = 2;
1236                         f->first_mp = 0;
1237                 }
1238                 f->is_mp = 0;
1239
1240                 break;
1241
1242         case SS4_PACKET_ID_MULTI:
1243                 if (priv->flags & ALPS_BUTTONPAD) {
1244                         f->mt[2].x = SS4_BTL_MF_X_V2(p, 0);
1245                         f->mt[2].y = SS4_BTL_MF_Y_V2(p, 0);
1246                         f->mt[3].x = SS4_BTL_MF_X_V2(p, 1);
1247                         f->mt[3].y = SS4_BTL_MF_Y_V2(p, 1);
1248                         no_data_x = SS4_MFPACKET_NO_AX_BL;
1249                         no_data_y = SS4_MFPACKET_NO_AY_BL;
1250                 } else {
1251                         f->mt[2].x = SS4_STD_MF_X_V2(p, 0);
1252                         f->mt[2].y = SS4_STD_MF_Y_V2(p, 0);
1253                         f->mt[3].x = SS4_STD_MF_X_V2(p, 1);
1254                         f->mt[3].y = SS4_STD_MF_Y_V2(p, 1);
1255                         no_data_x = SS4_MFPACKET_NO_AX;
1256                         no_data_y = SS4_MFPACKET_NO_AY;
1257                 }
1258
1259                 f->first_mp = 0;
1260                 f->is_mp = 1;
1261
1262                 if (SS4_IS_5F_DETECTED(p)) {
1263                         f->fingers = 5;
1264                 } else if (f->mt[3].x == no_data_x &&
1265                              f->mt[3].y == no_data_y) {
1266                         f->mt[3].x = 0;
1267                         f->mt[3].y = 0;
1268                         f->fingers = 3;
1269                 } else {
1270                         f->fingers = 4;
1271                 }
1272                 break;
1273
1274         case SS4_PACKET_ID_STICK:
1275                 /*
1276                  * x, y, and pressure are decoded in
1277                  * alps_process_packet_ss4_v2()
1278                  */
1279                 f->first_mp = 0;
1280                 f->is_mp = 0;
1281                 break;
1282
1283         case SS4_PACKET_ID_IDLE:
1284         default:
1285                 memset(f, 0, sizeof(struct alps_fields));
1286                 break;
1287         }
1288
1289         /* handle buttons */
1290         if (pkt_id == SS4_PACKET_ID_STICK) {
1291                 f->ts_left = !!(SS4_BTN_V2(p) & 0x01);
1292                 if (!(priv->flags & ALPS_BUTTONPAD)) {
1293                         f->ts_right = !!(SS4_BTN_V2(p) & 0x02);
1294                         f->ts_middle = !!(SS4_BTN_V2(p) & 0x04);
1295                 }
1296         } else {
1297                 f->left = !!(SS4_BTN_V2(p) & 0x01);
1298                 if (!(priv->flags & ALPS_BUTTONPAD)) {
1299                         f->right = !!(SS4_BTN_V2(p) & 0x02);
1300                         f->middle = !!(SS4_BTN_V2(p) & 0x04);
1301                 }
1302         }
1303
1304         return 0;
1305 }
1306
1307 static void alps_process_packet_ss4_v2(struct psmouse *psmouse)
1308 {
1309         struct alps_data *priv = psmouse->private;
1310         unsigned char *packet = psmouse->packet;
1311         struct input_dev *dev = psmouse->dev;
1312         struct input_dev *dev2 = priv->dev2;
1313         struct alps_fields *f = &priv->f;
1314
1315         memset(f, 0, sizeof(struct alps_fields));
1316         priv->decode_fields(f, packet, psmouse);
1317         if (priv->multi_packet) {
1318                 /*
1319                  * Sometimes the first packet will indicate a multi-packet
1320                  * sequence, but sometimes the next multi-packet would not
1321                  * come. Check for this, and when it happens process the
1322                  * position packet as usual.
1323                  */
1324                 if (f->is_mp) {
1325                         /* Now process the 1st packet */
1326                         priv->decode_fields(f, priv->multi_data, psmouse);
1327                 } else {
1328                         priv->multi_packet = 0;
1329                 }
1330         }
1331
1332         /*
1333          * "f.is_mp" would always be '0' after merging the 1st and 2nd packet.
1334          * When it is set, it means 2nd packet comes without 1st packet come.
1335          */
1336         if (f->is_mp)
1337                 return;
1338
1339         /* Save the first packet */
1340         if (!priv->multi_packet && f->first_mp) {
1341                 priv->multi_packet = 1;
1342                 memcpy(priv->multi_data, packet, sizeof(priv->multi_data));
1343                 return;
1344         }
1345
1346         priv->multi_packet = 0;
1347
1348         /* Report trackstick */
1349         if (alps_get_pkt_id_ss4_v2(packet) == SS4_PACKET_ID_STICK) {
1350                 if (!(priv->flags & ALPS_DUALPOINT)) {
1351                         psmouse_warn(psmouse,
1352                                      "Rejected trackstick packet from non DualPoint device");
1353                         return;
1354                 }
1355
1356                 input_report_rel(dev2, REL_X, SS4_TS_X_V2(packet));
1357                 input_report_rel(dev2, REL_Y, SS4_TS_Y_V2(packet));
1358                 input_report_abs(dev2, ABS_PRESSURE, SS4_TS_Z_V2(packet));
1359
1360                 input_report_key(dev2, BTN_LEFT, f->ts_left);
1361                 input_report_key(dev2, BTN_RIGHT, f->ts_right);
1362                 input_report_key(dev2, BTN_MIDDLE, f->ts_middle);
1363
1364                 input_sync(dev2);
1365                 return;
1366         }
1367
1368         /* Report touchpad */
1369         alps_report_mt_data(psmouse, (f->fingers <= 4) ? f->fingers : 4);
1370
1371         input_mt_report_finger_count(dev, f->fingers);
1372
1373         input_report_key(dev, BTN_LEFT, f->left);
1374         input_report_key(dev, BTN_RIGHT, f->right);
1375         input_report_key(dev, BTN_MIDDLE, f->middle);
1376
1377         input_report_abs(dev, ABS_PRESSURE, f->pressure);
1378         input_sync(dev);
1379 }
1380
1381 static bool alps_is_valid_package_ss4_v2(struct psmouse *psmouse)
1382 {
1383         if (psmouse->pktcnt == 4 && ((psmouse->packet[3] & 0x08) != 0x08))
1384                 return false;
1385         if (psmouse->pktcnt == 6 && ((psmouse->packet[5] & 0x10) != 0x0))
1386                 return false;
1387         return true;
1388 }
1389
1390 static DEFINE_MUTEX(alps_mutex);
1391
1392 static void alps_register_bare_ps2_mouse(struct work_struct *work)
1393 {
1394         struct alps_data *priv =
1395                 container_of(work, struct alps_data, dev3_register_work.work);
1396         struct psmouse *psmouse = priv->psmouse;
1397         struct input_dev *dev3;
1398         int error = 0;
1399
1400         mutex_lock(&alps_mutex);
1401
1402         if (priv->dev3)
1403                 goto out;
1404
1405         dev3 = input_allocate_device();
1406         if (!dev3) {
1407                 psmouse_err(psmouse, "failed to allocate secondary device\n");
1408                 error = -ENOMEM;
1409                 goto out;
1410         }
1411
1412         snprintf(priv->phys3, sizeof(priv->phys3), "%s/%s",
1413                  psmouse->ps2dev.serio->phys,
1414                  (priv->dev2 ? "input2" : "input1"));
1415         dev3->phys = priv->phys3;
1416
1417         /*
1418          * format of input device name is: "protocol vendor name"
1419          * see function psmouse_switch_protocol() in psmouse-base.c
1420          */
1421         dev3->name = "PS/2 ALPS Mouse";
1422
1423         dev3->id.bustype = BUS_I8042;
1424         dev3->id.vendor  = 0x0002;
1425         dev3->id.product = PSMOUSE_PS2;
1426         dev3->id.version = 0x0000;
1427         dev3->dev.parent = &psmouse->ps2dev.serio->dev;
1428
1429         input_set_capability(dev3, EV_REL, REL_X);
1430         input_set_capability(dev3, EV_REL, REL_Y);
1431         input_set_capability(dev3, EV_KEY, BTN_LEFT);
1432         input_set_capability(dev3, EV_KEY, BTN_RIGHT);
1433         input_set_capability(dev3, EV_KEY, BTN_MIDDLE);
1434
1435         __set_bit(INPUT_PROP_POINTER, dev3->propbit);
1436
1437         error = input_register_device(dev3);
1438         if (error) {
1439                 psmouse_err(psmouse,
1440                             "failed to register secondary device: %d\n",
1441                             error);
1442                 input_free_device(dev3);
1443                 goto out;
1444         }
1445
1446         priv->dev3 = dev3;
1447
1448 out:
1449         /*
1450          * Save the error code so that we can detect that we
1451          * already tried to create the device.
1452          */
1453         if (error)
1454                 priv->dev3 = ERR_PTR(error);
1455
1456         mutex_unlock(&alps_mutex);
1457 }
1458
1459 static void alps_report_bare_ps2_packet(struct psmouse *psmouse,
1460                                         unsigned char packet[],
1461                                         bool report_buttons)
1462 {
1463         struct alps_data *priv = psmouse->private;
1464         struct input_dev *dev, *dev2 = NULL;
1465
1466         /* Figure out which device to use to report the bare packet */
1467         if (priv->proto_version == ALPS_PROTO_V2 &&
1468             (priv->flags & ALPS_DUALPOINT)) {
1469                 /* On V2 devices the DualPoint Stick reports bare packets */
1470                 dev = priv->dev2;
1471                 dev2 = psmouse->dev;
1472         } else if (unlikely(IS_ERR_OR_NULL(priv->dev3))) {
1473                 /* Register dev3 mouse if we received PS/2 packet first time */
1474                 if (!IS_ERR(priv->dev3))
1475                         psmouse_queue_work(psmouse, &priv->dev3_register_work,
1476                                            0);
1477                 return;
1478         } else {
1479                 dev = priv->dev3;
1480         }
1481
1482         if (report_buttons)
1483                 alps_report_buttons(dev, dev2,
1484                                 packet[0] & 1, packet[0] & 2, packet[0] & 4);
1485
1486         input_report_rel(dev, REL_X,
1487                 packet[1] ? packet[1] - ((packet[0] << 4) & 0x100) : 0);
1488         input_report_rel(dev, REL_Y,
1489                 packet[2] ? ((packet[0] << 3) & 0x100) - packet[2] : 0);
1490
1491         input_sync(dev);
1492 }
1493
1494 static psmouse_ret_t alps_handle_interleaved_ps2(struct psmouse *psmouse)
1495 {
1496         struct alps_data *priv = psmouse->private;
1497
1498         if (psmouse->pktcnt < 6)
1499                 return PSMOUSE_GOOD_DATA;
1500
1501         if (psmouse->pktcnt == 6) {
1502                 /*
1503                  * Start a timer to flush the packet if it ends up last
1504                  * 6-byte packet in the stream. Timer needs to fire
1505                  * psmouse core times out itself. 20 ms should be enough
1506                  * to decide if we are getting more data or not.
1507                  */
1508                 mod_timer(&priv->timer, jiffies + msecs_to_jiffies(20));
1509                 return PSMOUSE_GOOD_DATA;
1510         }
1511
1512         del_timer(&priv->timer);
1513
1514         if (psmouse->packet[6] & 0x80) {
1515
1516                 /*
1517                  * Highest bit is set - that means we either had
1518                  * complete ALPS packet and this is start of the
1519                  * next packet or we got garbage.
1520                  */
1521
1522                 if (((psmouse->packet[3] |
1523                       psmouse->packet[4] |
1524                       psmouse->packet[5]) & 0x80) ||
1525                     (!alps_is_valid_first_byte(priv, psmouse->packet[6]))) {
1526                         psmouse_dbg(psmouse,
1527                                     "refusing packet %4ph (suspected interleaved ps/2)\n",
1528                                     psmouse->packet + 3);
1529                         return PSMOUSE_BAD_DATA;
1530                 }
1531
1532                 priv->process_packet(psmouse);
1533
1534                 /* Continue with the next packet */
1535                 psmouse->packet[0] = psmouse->packet[6];
1536                 psmouse->pktcnt = 1;
1537
1538         } else {
1539
1540                 /*
1541                  * High bit is 0 - that means that we indeed got a PS/2
1542                  * packet in the middle of ALPS packet.
1543                  *
1544                  * There is also possibility that we got 6-byte ALPS
1545                  * packet followed  by 3-byte packet from trackpoint. We
1546                  * can not distinguish between these 2 scenarios but
1547                  * because the latter is unlikely to happen in course of
1548                  * normal operation (user would need to press all
1549                  * buttons on the pad and start moving trackpoint
1550                  * without touching the pad surface) we assume former.
1551                  * Even if we are wrong the wost thing that would happen
1552                  * the cursor would jump but we should not get protocol
1553                  * de-synchronization.
1554                  */
1555
1556                 alps_report_bare_ps2_packet(psmouse, &psmouse->packet[3],
1557                                             false);
1558
1559                 /*
1560                  * Continue with the standard ALPS protocol handling,
1561                  * but make sure we won't process it as an interleaved
1562                  * packet again, which may happen if all buttons are
1563                  * pressed. To avoid this let's reset the 4th bit which
1564                  * is normally 1.
1565                  */
1566                 psmouse->packet[3] = psmouse->packet[6] & 0xf7;
1567                 psmouse->pktcnt = 4;
1568         }
1569
1570         return PSMOUSE_GOOD_DATA;
1571 }
1572
1573 static void alps_flush_packet(unsigned long data)
1574 {
1575         struct psmouse *psmouse = (struct psmouse *)data;
1576         struct alps_data *priv = psmouse->private;
1577
1578         serio_pause_rx(psmouse->ps2dev.serio);
1579
1580         if (psmouse->pktcnt == psmouse->pktsize) {
1581
1582                 /*
1583                  * We did not any more data in reasonable amount of time.
1584                  * Validate the last 3 bytes and process as a standard
1585                  * ALPS packet.
1586                  */
1587                 if ((psmouse->packet[3] |
1588                      psmouse->packet[4] |
1589                      psmouse->packet[5]) & 0x80) {
1590                         psmouse_dbg(psmouse,
1591                                     "refusing packet %3ph (suspected interleaved ps/2)\n",
1592                                     psmouse->packet + 3);
1593                 } else {
1594                         priv->process_packet(psmouse);
1595                 }
1596                 psmouse->pktcnt = 0;
1597         }
1598
1599         serio_continue_rx(psmouse->ps2dev.serio);
1600 }
1601
1602 static psmouse_ret_t alps_process_byte(struct psmouse *psmouse)
1603 {
1604         struct alps_data *priv = psmouse->private;
1605
1606         /*
1607          * Check if we are dealing with a bare PS/2 packet, presumably from
1608          * a device connected to the external PS/2 port. Because bare PS/2
1609          * protocol does not have enough constant bits to self-synchronize
1610          * properly we only do this if the device is fully synchronized.
1611          * Can not distinguish V8's first byte from PS/2 packet's
1612          */
1613         if (priv->proto_version != ALPS_PROTO_V8 &&
1614             !psmouse->out_of_sync_cnt &&
1615             (psmouse->packet[0] & 0xc8) == 0x08) {
1616
1617                 if (psmouse->pktcnt == 3) {
1618                         alps_report_bare_ps2_packet(psmouse, psmouse->packet,
1619                                                     true);
1620                         return PSMOUSE_FULL_PACKET;
1621                 }
1622                 return PSMOUSE_GOOD_DATA;
1623         }
1624
1625         /* Check for PS/2 packet stuffed in the middle of ALPS packet. */
1626
1627         if ((priv->flags & ALPS_PS2_INTERLEAVED) &&
1628             psmouse->pktcnt >= 4 && (psmouse->packet[3] & 0x0f) == 0x0f) {
1629                 return alps_handle_interleaved_ps2(psmouse);
1630         }
1631
1632         if (!alps_is_valid_first_byte(priv, psmouse->packet[0])) {
1633                 psmouse_dbg(psmouse,
1634                             "refusing packet[0] = %x (mask0 = %x, byte0 = %x)\n",
1635                             psmouse->packet[0], priv->mask0, priv->byte0);
1636                 return PSMOUSE_BAD_DATA;
1637         }
1638
1639         /* Bytes 2 - pktsize should have 0 in the highest bit */
1640         if (priv->proto_version < ALPS_PROTO_V5 &&
1641             psmouse->pktcnt >= 2 && psmouse->pktcnt <= psmouse->pktsize &&
1642             (psmouse->packet[psmouse->pktcnt - 1] & 0x80)) {
1643                 psmouse_dbg(psmouse, "refusing packet[%i] = %x\n",
1644                             psmouse->pktcnt - 1,
1645                             psmouse->packet[psmouse->pktcnt - 1]);
1646
1647                 if (priv->proto_version == ALPS_PROTO_V3_RUSHMORE &&
1648                     psmouse->pktcnt == psmouse->pktsize) {
1649                         /*
1650                          * Some Dell boxes, such as Latitude E6440 or E7440
1651                          * with closed lid, quite often smash last byte of
1652                          * otherwise valid packet with 0xff. Given that the
1653                          * next packet is very likely to be valid let's
1654                          * report PSMOUSE_FULL_PACKET but not process data,
1655                          * rather than reporting PSMOUSE_BAD_DATA and
1656                          * filling the logs.
1657                          */
1658                         return PSMOUSE_FULL_PACKET;
1659                 }
1660
1661                 return PSMOUSE_BAD_DATA;
1662         }
1663
1664         if ((priv->proto_version == ALPS_PROTO_V7 &&
1665                         !alps_is_valid_package_v7(psmouse)) ||
1666             (priv->proto_version == ALPS_PROTO_V8 &&
1667                         !alps_is_valid_package_ss4_v2(psmouse))) {
1668                 psmouse_dbg(psmouse, "refusing packet[%i] = %x\n",
1669                             psmouse->pktcnt - 1,
1670                             psmouse->packet[psmouse->pktcnt - 1]);
1671                 return PSMOUSE_BAD_DATA;
1672         }
1673
1674         if (psmouse->pktcnt == psmouse->pktsize) {
1675                 priv->process_packet(psmouse);
1676                 return PSMOUSE_FULL_PACKET;
1677         }
1678
1679         return PSMOUSE_GOOD_DATA;
1680 }
1681
1682 static int alps_command_mode_send_nibble(struct psmouse *psmouse, int nibble)
1683 {
1684         struct ps2dev *ps2dev = &psmouse->ps2dev;
1685         struct alps_data *priv = psmouse->private;
1686         int command;
1687         unsigned char *param;
1688         unsigned char dummy[4];
1689
1690         BUG_ON(nibble > 0xf);
1691
1692         command = priv->nibble_commands[nibble].command;
1693         param = (command & 0x0f00) ?
1694                 dummy : (unsigned char *)&priv->nibble_commands[nibble].data;
1695
1696         if (ps2_command(ps2dev, param, command))
1697                 return -1;
1698
1699         return 0;
1700 }
1701
1702 static int alps_command_mode_set_addr(struct psmouse *psmouse, int addr)
1703 {
1704         struct ps2dev *ps2dev = &psmouse->ps2dev;
1705         struct alps_data *priv = psmouse->private;
1706         int i, nibble;
1707
1708         if (ps2_command(ps2dev, NULL, priv->addr_command))
1709                 return -1;
1710
1711         for (i = 12; i >= 0; i -= 4) {
1712                 nibble = (addr >> i) & 0xf;
1713                 if (alps_command_mode_send_nibble(psmouse, nibble))
1714                         return -1;
1715         }
1716
1717         return 0;
1718 }
1719
1720 static int __alps_command_mode_read_reg(struct psmouse *psmouse, int addr)
1721 {
1722         struct ps2dev *ps2dev = &psmouse->ps2dev;
1723         unsigned char param[4];
1724
1725         if (ps2_command(ps2dev, param, PSMOUSE_CMD_GETINFO))
1726                 return -1;
1727
1728         /*
1729          * The address being read is returned in the first two bytes
1730          * of the result. Check that this address matches the expected
1731          * address.
1732          */
1733         if (addr != ((param[0] << 8) | param[1]))
1734                 return -1;
1735
1736         return param[2];
1737 }
1738
1739 static int alps_command_mode_read_reg(struct psmouse *psmouse, int addr)
1740 {
1741         if (alps_command_mode_set_addr(psmouse, addr))
1742                 return -1;
1743         return __alps_command_mode_read_reg(psmouse, addr);
1744 }
1745
1746 static int __alps_command_mode_write_reg(struct psmouse *psmouse, u8 value)
1747 {
1748         if (alps_command_mode_send_nibble(psmouse, (value >> 4) & 0xf))
1749                 return -1;
1750         if (alps_command_mode_send_nibble(psmouse, value & 0xf))
1751                 return -1;
1752         return 0;
1753 }
1754
1755 static int alps_command_mode_write_reg(struct psmouse *psmouse, int addr,
1756                                        u8 value)
1757 {
1758         if (alps_command_mode_set_addr(psmouse, addr))
1759                 return -1;
1760         return __alps_command_mode_write_reg(psmouse, value);
1761 }
1762
1763 static int alps_rpt_cmd(struct psmouse *psmouse, int init_command,
1764                         int repeated_command, unsigned char *param)
1765 {
1766         struct ps2dev *ps2dev = &psmouse->ps2dev;
1767
1768         param[0] = 0;
1769         if (init_command && ps2_command(ps2dev, param, init_command))
1770                 return -EIO;
1771
1772         if (ps2_command(ps2dev,  NULL, repeated_command) ||
1773             ps2_command(ps2dev,  NULL, repeated_command) ||
1774             ps2_command(ps2dev,  NULL, repeated_command))
1775                 return -EIO;
1776
1777         param[0] = param[1] = param[2] = 0xff;
1778         if (ps2_command(ps2dev, param, PSMOUSE_CMD_GETINFO))
1779                 return -EIO;
1780
1781         psmouse_dbg(psmouse, "%2.2X report: %3ph\n",
1782                     repeated_command, param);
1783         return 0;
1784 }
1785
1786 static bool alps_check_valid_firmware_id(unsigned char id[])
1787 {
1788         if (id[0] == 0x73)
1789                 return true;
1790
1791         if (id[0] == 0x88 &&
1792             (id[1] == 0x07 ||
1793              id[1] == 0x08 ||
1794              (id[1] & 0xf0) == 0xb0 ||
1795              (id[1] & 0xf0) == 0xc0)) {
1796                 return true;
1797         }
1798
1799         return false;
1800 }
1801
1802 static int alps_enter_command_mode(struct psmouse *psmouse)
1803 {
1804         unsigned char param[4];
1805
1806         if (alps_rpt_cmd(psmouse, 0, PSMOUSE_CMD_RESET_WRAP, param)) {
1807                 psmouse_err(psmouse, "failed to enter command mode\n");
1808                 return -1;
1809         }
1810
1811         if (!alps_check_valid_firmware_id(param)) {
1812                 psmouse_dbg(psmouse,
1813                             "unknown response while entering command mode\n");
1814                 return -1;
1815         }
1816         return 0;
1817 }
1818
1819 static inline int alps_exit_command_mode(struct psmouse *psmouse)
1820 {
1821         struct ps2dev *ps2dev = &psmouse->ps2dev;
1822         if (ps2_command(ps2dev, NULL, PSMOUSE_CMD_SETSTREAM))
1823                 return -1;
1824         return 0;
1825 }
1826
1827 /*
1828  * For DualPoint devices select the device that should respond to
1829  * subsequent commands. It looks like glidepad is behind stickpointer,
1830  * I'd thought it would be other way around...
1831  */
1832 static int alps_passthrough_mode_v2(struct psmouse *psmouse, bool enable)
1833 {
1834         struct ps2dev *ps2dev = &psmouse->ps2dev;
1835         int cmd = enable ? PSMOUSE_CMD_SETSCALE21 : PSMOUSE_CMD_SETSCALE11;
1836
1837         if (ps2_command(ps2dev, NULL, cmd) ||
1838             ps2_command(ps2dev, NULL, cmd) ||
1839             ps2_command(ps2dev, NULL, cmd) ||
1840             ps2_command(ps2dev, NULL, PSMOUSE_CMD_DISABLE))
1841                 return -1;
1842
1843         /* we may get 3 more bytes, just ignore them */
1844         ps2_drain(ps2dev, 3, 100);
1845
1846         return 0;
1847 }
1848
1849 static int alps_absolute_mode_v1_v2(struct psmouse *psmouse)
1850 {
1851         struct ps2dev *ps2dev = &psmouse->ps2dev;
1852
1853         /* Try ALPS magic knock - 4 disable before enable */
1854         if (ps2_command(ps2dev, NULL, PSMOUSE_CMD_DISABLE) ||
1855             ps2_command(ps2dev, NULL, PSMOUSE_CMD_DISABLE) ||
1856             ps2_command(ps2dev, NULL, PSMOUSE_CMD_DISABLE) ||
1857             ps2_command(ps2dev, NULL, PSMOUSE_CMD_DISABLE) ||
1858             ps2_command(ps2dev, NULL, PSMOUSE_CMD_ENABLE))
1859                 return -1;
1860
1861         /*
1862          * Switch mouse to poll (remote) mode so motion data will not
1863          * get in our way
1864          */
1865         return ps2_command(ps2dev, NULL, PSMOUSE_CMD_SETPOLL);
1866 }
1867
1868 static int alps_monitor_mode_send_word(struct psmouse *psmouse, u16 word)
1869 {
1870         int i, nibble;
1871
1872         /*
1873          * b0-b11 are valid bits, send sequence is inverse.
1874          * e.g. when word = 0x0123, nibble send sequence is 3, 2, 1
1875          */
1876         for (i = 0; i <= 8; i += 4) {
1877                 nibble = (word >> i) & 0xf;
1878                 if (alps_command_mode_send_nibble(psmouse, nibble))
1879                         return -1;
1880         }
1881
1882         return 0;
1883 }
1884
1885 static int alps_monitor_mode_write_reg(struct psmouse *psmouse,
1886                                        u16 addr, u16 value)
1887 {
1888         struct ps2dev *ps2dev = &psmouse->ps2dev;
1889
1890         /* 0x0A0 is the command to write the word */
1891         if (ps2_command(ps2dev, NULL, PSMOUSE_CMD_ENABLE) ||
1892             alps_monitor_mode_send_word(psmouse, 0x0A0) ||
1893             alps_monitor_mode_send_word(psmouse, addr) ||
1894             alps_monitor_mode_send_word(psmouse, value) ||
1895             ps2_command(ps2dev, NULL, PSMOUSE_CMD_DISABLE))
1896                 return -1;
1897
1898         return 0;
1899 }
1900
1901 static int alps_monitor_mode(struct psmouse *psmouse, bool enable)
1902 {
1903         struct ps2dev *ps2dev = &psmouse->ps2dev;
1904
1905         if (enable) {
1906                 /* EC E9 F5 F5 E7 E6 E7 E9 to enter monitor mode */
1907                 if (ps2_command(ps2dev, NULL, PSMOUSE_CMD_RESET_WRAP) ||
1908                     ps2_command(ps2dev, NULL, PSMOUSE_CMD_GETINFO) ||
1909                     ps2_command(ps2dev, NULL, PSMOUSE_CMD_DISABLE) ||
1910                     ps2_command(ps2dev, NULL, PSMOUSE_CMD_DISABLE) ||
1911                     ps2_command(ps2dev, NULL, PSMOUSE_CMD_SETSCALE21) ||
1912                     ps2_command(ps2dev, NULL, PSMOUSE_CMD_SETSCALE11) ||
1913                     ps2_command(ps2dev, NULL, PSMOUSE_CMD_SETSCALE21) ||
1914                     ps2_command(ps2dev, NULL, PSMOUSE_CMD_GETINFO))
1915                         return -1;
1916         } else {
1917                 /* EC to exit monitor mode */
1918                 if (ps2_command(ps2dev, NULL, PSMOUSE_CMD_RESET_WRAP))
1919                         return -1;
1920         }
1921
1922         return 0;
1923 }
1924
1925 static int alps_absolute_mode_v6(struct psmouse *psmouse)
1926 {
1927         u16 reg_val = 0x181;
1928         int ret = -1;
1929
1930         /* enter monitor mode, to write the register */
1931         if (alps_monitor_mode(psmouse, true))
1932                 return -1;
1933
1934         ret = alps_monitor_mode_write_reg(psmouse, 0x000, reg_val);
1935
1936         if (alps_monitor_mode(psmouse, false))
1937                 ret = -1;
1938
1939         return ret;
1940 }
1941
1942 static int alps_get_status(struct psmouse *psmouse, char *param)
1943 {
1944         /* Get status: 0xF5 0xF5 0xF5 0xE9 */
1945         if (alps_rpt_cmd(psmouse, 0, PSMOUSE_CMD_DISABLE, param))
1946                 return -1;
1947
1948         return 0;
1949 }
1950
1951 /*
1952  * Turn touchpad tapping on or off. The sequences are:
1953  * 0xE9 0xF5 0xF5 0xF3 0x0A to enable,
1954  * 0xE9 0xF5 0xF5 0xE8 0x00 to disable.
1955  * My guess that 0xE9 (GetInfo) is here as a sync point.
1956  * For models that also have stickpointer (DualPoints) its tapping
1957  * is controlled separately (0xE6 0xE6 0xE6 0xF3 0x14|0x0A) but
1958  * we don't fiddle with it.
1959  */
1960 static int alps_tap_mode(struct psmouse *psmouse, int enable)
1961 {
1962         struct ps2dev *ps2dev = &psmouse->ps2dev;
1963         int cmd = enable ? PSMOUSE_CMD_SETRATE : PSMOUSE_CMD_SETRES;
1964         unsigned char tap_arg = enable ? 0x0A : 0x00;
1965         unsigned char param[4];
1966
1967         if (ps2_command(ps2dev, param, PSMOUSE_CMD_GETINFO) ||
1968             ps2_command(ps2dev, NULL, PSMOUSE_CMD_DISABLE) ||
1969             ps2_command(ps2dev, NULL, PSMOUSE_CMD_DISABLE) ||
1970             ps2_command(ps2dev, &tap_arg, cmd))
1971                 return -1;
1972
1973         if (alps_get_status(psmouse, param))
1974                 return -1;
1975
1976         return 0;
1977 }
1978
1979 /*
1980  * alps_poll() - poll the touchpad for current motion packet.
1981  * Used in resync.
1982  */
1983 static int alps_poll(struct psmouse *psmouse)
1984 {
1985         struct alps_data *priv = psmouse->private;
1986         unsigned char buf[sizeof(psmouse->packet)];
1987         bool poll_failed;
1988
1989         if (priv->flags & ALPS_PASS)
1990                 alps_passthrough_mode_v2(psmouse, true);
1991
1992         poll_failed = ps2_command(&psmouse->ps2dev, buf,
1993                                   PSMOUSE_CMD_POLL | (psmouse->pktsize << 8)) < 0;
1994
1995         if (priv->flags & ALPS_PASS)
1996                 alps_passthrough_mode_v2(psmouse, false);
1997
1998         if (poll_failed || (buf[0] & priv->mask0) != priv->byte0)
1999                 return -1;
2000
2001         if ((psmouse->badbyte & 0xc8) == 0x08) {
2002 /*
2003  * Poll the track stick ...
2004  */
2005                 if (ps2_command(&psmouse->ps2dev, buf, PSMOUSE_CMD_POLL | (3 << 8)))
2006                         return -1;
2007         }
2008
2009         memcpy(psmouse->packet, buf, sizeof(buf));
2010         return 0;
2011 }
2012
2013 static int alps_hw_init_v1_v2(struct psmouse *psmouse)
2014 {
2015         struct alps_data *priv = psmouse->private;
2016
2017         if ((priv->flags & ALPS_PASS) &&
2018             alps_passthrough_mode_v2(psmouse, true)) {
2019                 return -1;
2020         }
2021
2022         if (alps_tap_mode(psmouse, true)) {
2023                 psmouse_warn(psmouse, "Failed to enable hardware tapping\n");
2024                 return -1;
2025         }
2026
2027         if (alps_absolute_mode_v1_v2(psmouse)) {
2028                 psmouse_err(psmouse, "Failed to enable absolute mode\n");
2029                 return -1;
2030         }
2031
2032         if ((priv->flags & ALPS_PASS) &&
2033             alps_passthrough_mode_v2(psmouse, false)) {
2034                 return -1;
2035         }
2036
2037         /* ALPS needs stream mode, otherwise it won't report any data */
2038         if (ps2_command(&psmouse->ps2dev, NULL, PSMOUSE_CMD_SETSTREAM)) {
2039                 psmouse_err(psmouse, "Failed to enable stream mode\n");
2040                 return -1;
2041         }
2042
2043         return 0;
2044 }
2045
2046 static int alps_hw_init_v6(struct psmouse *psmouse)
2047 {
2048         unsigned char param[2] = {0xC8, 0x14};
2049
2050         /* Enter passthrough mode to let trackpoint enter 6byte raw mode */
2051         if (alps_passthrough_mode_v2(psmouse, true))
2052                 return -1;
2053
2054         if (ps2_command(&psmouse->ps2dev, NULL, PSMOUSE_CMD_SETSCALE11) ||
2055             ps2_command(&psmouse->ps2dev, NULL, PSMOUSE_CMD_SETSCALE11) ||
2056             ps2_command(&psmouse->ps2dev, NULL, PSMOUSE_CMD_SETSCALE11) ||
2057             ps2_command(&psmouse->ps2dev, &param[0], PSMOUSE_CMD_SETRATE) ||
2058             ps2_command(&psmouse->ps2dev, &param[1], PSMOUSE_CMD_SETRATE))
2059                 return -1;
2060
2061         if (alps_passthrough_mode_v2(psmouse, false))
2062                 return -1;
2063
2064         if (alps_absolute_mode_v6(psmouse)) {
2065                 psmouse_err(psmouse, "Failed to enable absolute mode\n");
2066                 return -1;
2067         }
2068
2069         return 0;
2070 }
2071
2072 /*
2073  * Enable or disable passthrough mode to the trackstick.
2074  */
2075 static int alps_passthrough_mode_v3(struct psmouse *psmouse,
2076                                     int reg_base, bool enable)
2077 {
2078         int reg_val, ret = -1;
2079
2080         if (alps_enter_command_mode(psmouse))
2081                 return -1;
2082
2083         reg_val = alps_command_mode_read_reg(psmouse, reg_base + 0x0008);
2084         if (reg_val == -1)
2085                 goto error;
2086
2087         if (enable)
2088                 reg_val |= 0x01;
2089         else
2090                 reg_val &= ~0x01;
2091
2092         ret = __alps_command_mode_write_reg(psmouse, reg_val);
2093
2094 error:
2095         if (alps_exit_command_mode(psmouse))
2096                 ret = -1;
2097         return ret;
2098 }
2099
2100 /* Must be in command mode when calling this function */
2101 static int alps_absolute_mode_v3(struct psmouse *psmouse)
2102 {
2103         int reg_val;
2104
2105         reg_val = alps_command_mode_read_reg(psmouse, 0x0004);
2106         if (reg_val == -1)
2107                 return -1;
2108
2109         reg_val |= 0x06;
2110         if (__alps_command_mode_write_reg(psmouse, reg_val))
2111                 return -1;
2112
2113         return 0;
2114 }
2115
2116 static int alps_probe_trackstick_v3_v7(struct psmouse *psmouse, int reg_base)
2117 {
2118         int ret = -EIO, reg_val;
2119
2120         if (alps_enter_command_mode(psmouse))
2121                 goto error;
2122
2123         reg_val = alps_command_mode_read_reg(psmouse, reg_base + 0x08);
2124         if (reg_val == -1)
2125                 goto error;
2126
2127         /* bit 7: trackstick is present */
2128         ret = reg_val & 0x80 ? 0 : -ENODEV;
2129
2130 error:
2131         alps_exit_command_mode(psmouse);
2132         return ret;
2133 }
2134
2135 static int alps_setup_trackstick_v3(struct psmouse *psmouse, int reg_base)
2136 {
2137         struct ps2dev *ps2dev = &psmouse->ps2dev;
2138         int ret = 0;
2139         unsigned char param[4];
2140
2141         if (alps_passthrough_mode_v3(psmouse, reg_base, true))
2142                 return -EIO;
2143
2144         /*
2145          * E7 report for the trackstick
2146          *
2147          * There have been reports of failures to seem to trace back
2148          * to the above trackstick check failing. When these occur
2149          * this E7 report fails, so when that happens we continue
2150          * with the assumption that there isn't a trackstick after
2151          * all.
2152          */
2153         if (alps_rpt_cmd(psmouse, 0, PSMOUSE_CMD_SETSCALE21, param)) {
2154                 psmouse_warn(psmouse, "Failed to initialize trackstick (E7 report failed)\n");
2155                 ret = -ENODEV;
2156         } else {
2157                 psmouse_dbg(psmouse, "trackstick E7 report: %3ph\n", param);
2158
2159                 /*
2160                  * Not sure what this does, but it is absolutely
2161                  * essential. Without it, the touchpad does not
2162                  * work at all and the trackstick just emits normal
2163                  * PS/2 packets.
2164                  */
2165                 if (ps2_command(ps2dev, NULL, PSMOUSE_CMD_SETSCALE11) ||
2166                     ps2_command(ps2dev, NULL, PSMOUSE_CMD_SETSCALE11) ||
2167                     ps2_command(ps2dev, NULL, PSMOUSE_CMD_SETSCALE11) ||
2168                     alps_command_mode_send_nibble(psmouse, 0x9) ||
2169                     alps_command_mode_send_nibble(psmouse, 0x4)) {
2170                         psmouse_err(psmouse,
2171                                     "Error sending magic E6 sequence\n");
2172                         ret = -EIO;
2173                         goto error;
2174                 }
2175
2176                 /*
2177                  * This ensures the trackstick packets are in the format
2178                  * supported by this driver. If bit 1 isn't set the packet
2179                  * format is different.
2180                  */
2181                 if (alps_enter_command_mode(psmouse) ||
2182                     alps_command_mode_write_reg(psmouse,
2183                                                 reg_base + 0x08, 0x82) ||
2184                     alps_exit_command_mode(psmouse))
2185                         ret = -EIO;
2186         }
2187
2188 error:
2189         if (alps_passthrough_mode_v3(psmouse, reg_base, false))
2190                 ret = -EIO;
2191
2192         return ret;
2193 }
2194
2195 static int alps_hw_init_v3(struct psmouse *psmouse)
2196 {
2197         struct alps_data *priv = psmouse->private;
2198         struct ps2dev *ps2dev = &psmouse->ps2dev;
2199         int reg_val;
2200         unsigned char param[4];
2201
2202         if ((priv->flags & ALPS_DUALPOINT) &&
2203             alps_setup_trackstick_v3(psmouse, ALPS_REG_BASE_PINNACLE) == -EIO)
2204                 goto error;
2205
2206         if (alps_enter_command_mode(psmouse) ||
2207             alps_absolute_mode_v3(psmouse)) {
2208                 psmouse_err(psmouse, "Failed to enter absolute mode\n");
2209                 goto error;
2210         }
2211
2212         reg_val = alps_command_mode_read_reg(psmouse, 0x0006);
2213         if (reg_val == -1)
2214                 goto error;
2215         if (__alps_command_mode_write_reg(psmouse, reg_val | 0x01))
2216                 goto error;
2217
2218         reg_val = alps_command_mode_read_reg(psmouse, 0x0007);
2219         if (reg_val == -1)
2220                 goto error;
2221         if (__alps_command_mode_write_reg(psmouse, reg_val | 0x01))
2222                 goto error;
2223
2224         if (alps_command_mode_read_reg(psmouse, 0x0144) == -1)
2225                 goto error;
2226         if (__alps_command_mode_write_reg(psmouse, 0x04))
2227                 goto error;
2228
2229         if (alps_command_mode_read_reg(psmouse, 0x0159) == -1)
2230                 goto error;
2231         if (__alps_command_mode_write_reg(psmouse, 0x03))
2232                 goto error;
2233
2234         if (alps_command_mode_read_reg(psmouse, 0x0163) == -1)
2235                 goto error;
2236         if (alps_command_mode_write_reg(psmouse, 0x0163, 0x03))
2237                 goto error;
2238
2239         if (alps_command_mode_read_reg(psmouse, 0x0162) == -1)
2240                 goto error;
2241         if (alps_command_mode_write_reg(psmouse, 0x0162, 0x04))
2242                 goto error;
2243
2244         alps_exit_command_mode(psmouse);
2245
2246         /* Set rate and enable data reporting */
2247         param[0] = 0x64;
2248         if (ps2_command(ps2dev, param, PSMOUSE_CMD_SETRATE) ||
2249             ps2_command(ps2dev, NULL, PSMOUSE_CMD_ENABLE)) {
2250                 psmouse_err(psmouse, "Failed to enable data reporting\n");
2251                 return -1;
2252         }
2253
2254         return 0;
2255
2256 error:
2257         /*
2258          * Leaving the touchpad in command mode will essentially render
2259          * it unusable until the machine reboots, so exit it here just
2260          * to be safe
2261          */
2262         alps_exit_command_mode(psmouse);
2263         return -1;
2264 }
2265
2266 static int alps_get_v3_v7_resolution(struct psmouse *psmouse, int reg_pitch)
2267 {
2268         int reg, x_pitch, y_pitch, x_electrode, y_electrode, x_phys, y_phys;
2269         struct alps_data *priv = psmouse->private;
2270
2271         reg = alps_command_mode_read_reg(psmouse, reg_pitch);
2272         if (reg < 0)
2273                 return reg;
2274
2275         x_pitch = (char)(reg << 4) >> 4; /* sign extend lower 4 bits */
2276         x_pitch = 50 + 2 * x_pitch; /* In 0.1 mm units */
2277
2278         y_pitch = (char)reg >> 4; /* sign extend upper 4 bits */
2279         y_pitch = 36 + 2 * y_pitch; /* In 0.1 mm units */
2280
2281         reg = alps_command_mode_read_reg(psmouse, reg_pitch + 1);
2282         if (reg < 0)
2283                 return reg;
2284
2285         x_electrode = (char)(reg << 4) >> 4; /* sign extend lower 4 bits */
2286         x_electrode = 17 + x_electrode;
2287
2288         y_electrode = (char)reg >> 4; /* sign extend upper 4 bits */
2289         y_electrode = 13 + y_electrode;
2290
2291         x_phys = x_pitch * (x_electrode - 1); /* In 0.1 mm units */
2292         y_phys = y_pitch * (y_electrode - 1); /* In 0.1 mm units */
2293
2294         priv->x_res = priv->x_max * 10 / x_phys; /* units / mm */
2295         priv->y_res = priv->y_max * 10 / y_phys; /* units / mm */
2296
2297         psmouse_dbg(psmouse,
2298                     "pitch %dx%d num-electrodes %dx%d physical size %dx%d mm res %dx%d\n",
2299                     x_pitch, y_pitch, x_electrode, y_electrode,
2300                     x_phys / 10, y_phys / 10, priv->x_res, priv->y_res);
2301
2302         return 0;
2303 }
2304
2305 static int alps_hw_init_rushmore_v3(struct psmouse *psmouse)
2306 {
2307         struct alps_data *priv = psmouse->private;
2308         struct ps2dev *ps2dev = &psmouse->ps2dev;
2309         int reg_val, ret = -1;
2310
2311         if (priv->flags & ALPS_DUALPOINT) {
2312                 reg_val = alps_setup_trackstick_v3(psmouse,
2313                                                    ALPS_REG_BASE_RUSHMORE);
2314                 if (reg_val == -EIO)
2315                         goto error;
2316         }
2317
2318         if (alps_enter_command_mode(psmouse) ||
2319             alps_command_mode_read_reg(psmouse, 0xc2d9) == -1 ||
2320             alps_command_mode_write_reg(psmouse, 0xc2cb, 0x00))
2321                 goto error;
2322
2323         if (alps_get_v3_v7_resolution(psmouse, 0xc2da))
2324                 goto error;
2325
2326         reg_val = alps_command_mode_read_reg(psmouse, 0xc2c6);
2327         if (reg_val == -1)
2328                 goto error;
2329         if (__alps_command_mode_write_reg(psmouse, reg_val & 0xfd))
2330                 goto error;
2331
2332         if (alps_command_mode_write_reg(psmouse, 0xc2c9, 0x64))
2333                 goto error;
2334
2335         /* enter absolute mode */
2336         reg_val = alps_command_mode_read_reg(psmouse, 0xc2c4);
2337         if (reg_val == -1)
2338                 goto error;
2339         if (__alps_command_mode_write_reg(psmouse, reg_val | 0x02))
2340                 goto error;
2341
2342         alps_exit_command_mode(psmouse);
2343         return ps2_command(ps2dev, NULL, PSMOUSE_CMD_ENABLE);
2344
2345 error:
2346         alps_exit_command_mode(psmouse);
2347         return ret;
2348 }
2349
2350 /* Must be in command mode when calling this function */
2351 static int alps_absolute_mode_v4(struct psmouse *psmouse)
2352 {
2353         int reg_val;
2354
2355         reg_val = alps_command_mode_read_reg(psmouse, 0x0004);
2356         if (reg_val == -1)
2357                 return -1;
2358
2359         reg_val |= 0x02;
2360         if (__alps_command_mode_write_reg(psmouse, reg_val))
2361                 return -1;
2362
2363         return 0;
2364 }
2365
2366 static int alps_hw_init_v4(struct psmouse *psmouse)
2367 {
2368         struct ps2dev *ps2dev = &psmouse->ps2dev;
2369         unsigned char param[4];
2370
2371         if (alps_enter_command_mode(psmouse))
2372                 goto error;
2373
2374         if (alps_absolute_mode_v4(psmouse)) {
2375                 psmouse_err(psmouse, "Failed to enter absolute mode\n");
2376                 goto error;
2377         }
2378
2379         if (alps_command_mode_write_reg(psmouse, 0x0007, 0x8c))
2380                 goto error;
2381
2382         if (alps_command_mode_write_reg(psmouse, 0x0149, 0x03))
2383                 goto error;
2384
2385         if (alps_command_mode_write_reg(psmouse, 0x0160, 0x03))
2386                 goto error;
2387
2388         if (alps_command_mode_write_reg(psmouse, 0x017f, 0x15))
2389                 goto error;
2390
2391         if (alps_command_mode_write_reg(psmouse, 0x0151, 0x01))
2392                 goto error;
2393
2394         if (alps_command_mode_write_reg(psmouse, 0x0168, 0x03))
2395                 goto error;
2396
2397         if (alps_command_mode_write_reg(psmouse, 0x014a, 0x03))
2398                 goto error;
2399
2400         if (alps_command_mode_write_reg(psmouse, 0x0161, 0x03))
2401                 goto error;
2402
2403         alps_exit_command_mode(psmouse);
2404
2405         /*
2406          * This sequence changes the output from a 9-byte to an
2407          * 8-byte format. All the same data seems to be present,
2408          * just in a more compact format.
2409          */
2410         param[0] = 0xc8;
2411         param[1] = 0x64;
2412         param[2] = 0x50;
2413         if (ps2_command(ps2dev, &param[0], PSMOUSE_CMD_SETRATE) ||
2414             ps2_command(ps2dev, &param[1], PSMOUSE_CMD_SETRATE) ||
2415             ps2_command(ps2dev, &param[2], PSMOUSE_CMD_SETRATE) ||
2416             ps2_command(ps2dev, param, PSMOUSE_CMD_GETID))
2417                 return -1;
2418
2419         /* Set rate and enable data reporting */
2420         param[0] = 0x64;
2421         if (ps2_command(ps2dev, param, PSMOUSE_CMD_SETRATE) ||
2422             ps2_command(ps2dev, NULL, PSMOUSE_CMD_ENABLE)) {
2423                 psmouse_err(psmouse, "Failed to enable data reporting\n");
2424                 return -1;
2425         }
2426
2427         return 0;
2428
2429 error:
2430         /*
2431          * Leaving the touchpad in command mode will essentially render
2432          * it unusable until the machine reboots, so exit it here just
2433          * to be safe
2434          */
2435         alps_exit_command_mode(psmouse);
2436         return -1;
2437 }
2438
2439 static int alps_get_otp_values_ss4_v2(struct psmouse *psmouse,
2440                                       unsigned char index, unsigned char otp[])
2441 {
2442         struct ps2dev *ps2dev = &psmouse->ps2dev;
2443
2444         switch (index) {
2445         case 0:
2446                 if (ps2_command(ps2dev, NULL, PSMOUSE_CMD_SETSTREAM)  ||
2447                     ps2_command(ps2dev, NULL, PSMOUSE_CMD_SETSTREAM)  ||
2448                     ps2_command(ps2dev, otp, PSMOUSE_CMD_GETINFO))
2449                         return -1;
2450
2451                 break;
2452
2453         case 1:
2454                 if (ps2_command(ps2dev, NULL, PSMOUSE_CMD_SETPOLL)  ||
2455                     ps2_command(ps2dev, NULL, PSMOUSE_CMD_SETPOLL)  ||
2456                     ps2_command(ps2dev, otp, PSMOUSE_CMD_GETINFO))
2457                         return -1;
2458
2459                 break;
2460         }
2461
2462         return 0;
2463 }
2464
2465 static int alps_update_device_area_ss4_v2(unsigned char otp[][4],
2466                                           struct alps_data *priv)
2467 {
2468         int num_x_electrode;
2469         int num_y_electrode;
2470         int x_pitch, y_pitch, x_phys, y_phys;
2471
2472         num_x_electrode = SS4_NUMSENSOR_XOFFSET + (otp[1][0] & 0x0F);
2473         num_y_electrode = SS4_NUMSENSOR_YOFFSET + ((otp[1][0] >> 4) & 0x0F);
2474
2475         priv->x_max = (num_x_electrode - 1) * SS4_COUNT_PER_ELECTRODE;
2476         priv->y_max = (num_y_electrode - 1) * SS4_COUNT_PER_ELECTRODE;
2477
2478         x_pitch = ((otp[1][2] >> 2) & 0x07) + SS4_MIN_PITCH_MM;
2479         y_pitch = ((otp[1][2] >> 5) & 0x07) + SS4_MIN_PITCH_MM;
2480
2481         x_phys = x_pitch * (num_x_electrode - 1); /* In 0.1 mm units */
2482         y_phys = y_pitch * (num_y_electrode - 1); /* In 0.1 mm units */
2483
2484         priv->x_res = priv->x_max * 10 / x_phys; /* units / mm */
2485         priv->y_res = priv->y_max * 10 / y_phys; /* units / mm */
2486
2487         return 0;
2488 }
2489
2490 static int alps_update_btn_info_ss4_v2(unsigned char otp[][4],
2491                                        struct alps_data *priv)
2492 {
2493         unsigned char is_btnless;
2494
2495         is_btnless = (otp[1][1] >> 3) & 0x01;
2496
2497         if (is_btnless)
2498                 priv->flags |= ALPS_BUTTONPAD;
2499
2500         return 0;
2501 }
2502
2503 static int alps_set_defaults_ss4_v2(struct psmouse *psmouse,
2504                                     struct alps_data *priv)
2505 {
2506         unsigned char otp[2][4];
2507
2508         memset(otp, 0, sizeof(otp));
2509
2510         if (alps_get_otp_values_ss4_v2(psmouse, 0, &otp[0][0]) ||
2511             alps_get_otp_values_ss4_v2(psmouse, 1, &otp[1][0]))
2512                 return -1;
2513
2514         alps_update_device_area_ss4_v2(otp, priv);
2515
2516         alps_update_btn_info_ss4_v2(otp, priv);
2517
2518         return 0;
2519 }
2520
2521 static int alps_dolphin_get_device_area(struct psmouse *psmouse,
2522                                         struct alps_data *priv)
2523 {
2524         struct ps2dev *ps2dev = &psmouse->ps2dev;
2525         unsigned char param[4] = {0};
2526         int num_x_electrode, num_y_electrode;
2527
2528         if (alps_enter_command_mode(psmouse))
2529                 return -1;
2530
2531         param[0] = 0x0a;
2532         if (ps2_command(ps2dev, NULL, PSMOUSE_CMD_RESET_WRAP) ||
2533             ps2_command(ps2dev, NULL, PSMOUSE_CMD_SETPOLL) ||
2534             ps2_command(ps2dev, NULL, PSMOUSE_CMD_SETPOLL) ||
2535             ps2_command(ps2dev, &param[0], PSMOUSE_CMD_SETRATE) ||
2536             ps2_command(ps2dev, &param[0], PSMOUSE_CMD_SETRATE))
2537                 return -1;
2538
2539         if (ps2_command(ps2dev, param, PSMOUSE_CMD_GETINFO))
2540                 return -1;
2541
2542         /*
2543          * Dolphin's sensor line number is not fixed. It can be calculated
2544          * by adding the device's register value with DOLPHIN_PROFILE_X/YOFFSET.
2545          * Further more, we can get device's x_max and y_max by multiplying
2546          * sensor line number with DOLPHIN_COUNT_PER_ELECTRODE.
2547          *
2548          * e.g. When we get register's sensor_x = 11 & sensor_y = 8,
2549          *      real sensor line number X = 11 + 8 = 19, and
2550          *      real sensor line number Y = 8 + 1 = 9.
2551          *      So, x_max = (19 - 1) * 64 = 1152, and
2552          *          y_max = (9 - 1) * 64 = 512.
2553          */
2554         num_x_electrode = DOLPHIN_PROFILE_XOFFSET + (param[2] & 0x0F);
2555         num_y_electrode = DOLPHIN_PROFILE_YOFFSET + ((param[2] >> 4) & 0x0F);
2556         priv->x_bits = num_x_electrode;
2557         priv->y_bits = num_y_electrode;
2558         priv->x_max = (num_x_electrode - 1) * DOLPHIN_COUNT_PER_ELECTRODE;
2559         priv->y_max = (num_y_electrode - 1) * DOLPHIN_COUNT_PER_ELECTRODE;
2560
2561         if (alps_exit_command_mode(psmouse))
2562                 return -1;
2563
2564         return 0;
2565 }
2566
2567 static int alps_hw_init_dolphin_v1(struct psmouse *psmouse)
2568 {
2569         struct ps2dev *ps2dev = &psmouse->ps2dev;
2570         unsigned char param[2];
2571
2572         /* This is dolphin "v1" as empirically defined by florin9doi */
2573         param[0] = 0x64;
2574         param[1] = 0x28;
2575
2576         if (ps2_command(ps2dev, NULL, PSMOUSE_CMD_SETSTREAM) ||
2577             ps2_command(ps2dev, &param[0], PSMOUSE_CMD_SETRATE) ||
2578             ps2_command(ps2dev, &param[1], PSMOUSE_CMD_SETRATE))
2579                 return -1;
2580
2581         return 0;
2582 }
2583
2584 static int alps_hw_init_v7(struct psmouse *psmouse)
2585 {
2586         struct ps2dev *ps2dev = &psmouse->ps2dev;
2587         int reg_val, ret = -1;
2588
2589         if (alps_enter_command_mode(psmouse) ||
2590             alps_command_mode_read_reg(psmouse, 0xc2d9) == -1)
2591                 goto error;
2592
2593         if (alps_get_v3_v7_resolution(psmouse, 0xc397))
2594                 goto error;
2595
2596         if (alps_command_mode_write_reg(psmouse, 0xc2c9, 0x64))
2597                 goto error;
2598
2599         reg_val = alps_command_mode_read_reg(psmouse, 0xc2c4);
2600         if (reg_val == -1)
2601                 goto error;
2602         if (__alps_command_mode_write_reg(psmouse, reg_val | 0x02))
2603                 goto error;
2604
2605         alps_exit_command_mode(psmouse);
2606         return ps2_command(ps2dev, NULL, PSMOUSE_CMD_ENABLE);
2607
2608 error:
2609         alps_exit_command_mode(psmouse);
2610         return ret;
2611 }
2612
2613 static int alps_hw_init_ss4_v2(struct psmouse *psmouse)
2614 {
2615         struct ps2dev *ps2dev = &psmouse->ps2dev;
2616         char param[2] = {0x64, 0x28};
2617         int ret = -1;
2618
2619         /* enter absolute mode */
2620         if (ps2_command(ps2dev, NULL, PSMOUSE_CMD_SETSTREAM) ||
2621             ps2_command(ps2dev, NULL, PSMOUSE_CMD_SETSTREAM) ||
2622             ps2_command(ps2dev, &param[0], PSMOUSE_CMD_SETRATE) ||
2623             ps2_command(ps2dev, &param[1], PSMOUSE_CMD_SETRATE)) {
2624                 goto error;
2625         }
2626
2627         /* T.B.D. Decread noise packet number, delete in the future */
2628         if (alps_exit_command_mode(psmouse) ||
2629             alps_enter_command_mode(psmouse) ||
2630             alps_command_mode_write_reg(psmouse, 0x001D, 0x20)) {
2631                 goto error;
2632         }
2633         alps_exit_command_mode(psmouse);
2634
2635         return ps2_command(ps2dev, NULL, PSMOUSE_CMD_ENABLE);
2636
2637 error:
2638         alps_exit_command_mode(psmouse);
2639         return ret;
2640 }
2641
2642 static int alps_set_protocol(struct psmouse *psmouse,
2643                              struct alps_data *priv,
2644                              const struct alps_protocol_info *protocol)
2645 {
2646         psmouse->private = priv;
2647
2648         setup_timer(&priv->timer, alps_flush_packet, (unsigned long)psmouse);
2649
2650         priv->proto_version = protocol->version;
2651         priv->byte0 = protocol->byte0;
2652         priv->mask0 = protocol->mask0;
2653         priv->flags = protocol->flags;
2654
2655         priv->x_max = 2000;
2656         priv->y_max = 1400;
2657         priv->x_bits = 15;
2658         priv->y_bits = 11;
2659
2660         switch (priv->proto_version) {
2661         case ALPS_PROTO_V1:
2662         case ALPS_PROTO_V2:
2663                 priv->hw_init = alps_hw_init_v1_v2;
2664                 priv->process_packet = alps_process_packet_v1_v2;
2665                 priv->set_abs_params = alps_set_abs_params_st;
2666                 priv->x_max = 1023;
2667                 priv->y_max = 767;
2668                 if (dmi_check_system(alps_dmi_has_separate_stick_buttons))
2669                         priv->flags |= ALPS_STICK_BITS;
2670                 break;
2671
2672         case ALPS_PROTO_V3:
2673                 priv->hw_init = alps_hw_init_v3;
2674                 priv->process_packet = alps_process_packet_v3;
2675                 priv->set_abs_params = alps_set_abs_params_semi_mt;
2676                 priv->decode_fields = alps_decode_pinnacle;
2677                 priv->nibble_commands = alps_v3_nibble_commands;
2678                 priv->addr_command = PSMOUSE_CMD_RESET_WRAP;
2679
2680                 if (alps_probe_trackstick_v3_v7(psmouse,
2681                                                 ALPS_REG_BASE_PINNACLE) < 0)
2682                         priv->flags &= ~ALPS_DUALPOINT;
2683
2684                 break;
2685
2686         case ALPS_PROTO_V3_RUSHMORE:
2687                 priv->hw_init = alps_hw_init_rushmore_v3;
2688                 priv->process_packet = alps_process_packet_v3;
2689                 priv->set_abs_params = alps_set_abs_params_semi_mt;
2690                 priv->decode_fields = alps_decode_rushmore;
2691                 priv->nibble_commands = alps_v3_nibble_commands;
2692                 priv->addr_command = PSMOUSE_CMD_RESET_WRAP;
2693                 priv->x_bits = 16;
2694                 priv->y_bits = 12;
2695
2696                 if (alps_probe_trackstick_v3_v7(psmouse,
2697                                                 ALPS_REG_BASE_RUSHMORE) < 0)
2698                         priv->flags &= ~ALPS_DUALPOINT;
2699
2700                 break;
2701
2702         case ALPS_PROTO_V4:
2703                 priv->hw_init = alps_hw_init_v4;
2704                 priv->process_packet = alps_process_packet_v4;
2705                 priv->set_abs_params = alps_set_abs_params_semi_mt;
2706                 priv->nibble_commands = alps_v4_nibble_commands;
2707                 priv->addr_command = PSMOUSE_CMD_DISABLE;
2708                 break;
2709
2710         case ALPS_PROTO_V5:
2711                 priv->hw_init = alps_hw_init_dolphin_v1;
2712                 priv->process_packet = alps_process_touchpad_packet_v3_v5;
2713                 priv->decode_fields = alps_decode_dolphin;
2714                 priv->set_abs_params = alps_set_abs_params_semi_mt;
2715                 priv->nibble_commands = alps_v3_nibble_commands;
2716                 priv->addr_command = PSMOUSE_CMD_RESET_WRAP;
2717                 priv->x_bits = 23;
2718                 priv->y_bits = 12;
2719
2720                 if (alps_dolphin_get_device_area(psmouse, priv))
2721                         return -EIO;
2722
2723                 break;
2724
2725         case ALPS_PROTO_V6:
2726                 priv->hw_init = alps_hw_init_v6;
2727                 priv->process_packet = alps_process_packet_v6;
2728                 priv->set_abs_params = alps_set_abs_params_st;
2729                 priv->nibble_commands = alps_v6_nibble_commands;
2730                 priv->x_max = 2047;
2731                 priv->y_max = 1535;
2732                 break;
2733
2734         case ALPS_PROTO_V7:
2735                 priv->hw_init = alps_hw_init_v7;
2736                 priv->process_packet = alps_process_packet_v7;
2737                 priv->decode_fields = alps_decode_packet_v7;
2738                 priv->set_abs_params = alps_set_abs_params_v7;
2739                 priv->nibble_commands = alps_v3_nibble_commands;
2740                 priv->addr_command = PSMOUSE_CMD_RESET_WRAP;
2741                 priv->x_max = 0xfff;
2742                 priv->y_max = 0x7ff;
2743
2744                 if (priv->fw_ver[1] != 0xba)
2745                         priv->flags |= ALPS_BUTTONPAD;
2746
2747                 if (alps_probe_trackstick_v3_v7(psmouse, ALPS_REG_BASE_V7) < 0)
2748                         priv->flags &= ~ALPS_DUALPOINT;
2749
2750                 break;
2751
2752         case ALPS_PROTO_V8:
2753                 priv->hw_init = alps_hw_init_ss4_v2;
2754                 priv->process_packet = alps_process_packet_ss4_v2;
2755                 priv->decode_fields = alps_decode_ss4_v2;
2756                 priv->set_abs_params = alps_set_abs_params_ss4_v2;
2757                 priv->nibble_commands = alps_v3_nibble_commands;
2758                 priv->addr_command = PSMOUSE_CMD_RESET_WRAP;
2759
2760                 if (alps_set_defaults_ss4_v2(psmouse, priv))
2761                         return -EIO;
2762
2763                 if (priv->fw_ver[1] == 0x1)
2764                         priv->flags |= ALPS_DUALPOINT |
2765                                         ALPS_DUALPOINT_WITH_PRESSURE;
2766
2767                 break;
2768         }
2769
2770         return 0;
2771 }
2772
2773 static const struct alps_protocol_info *alps_match_table(unsigned char *e7,
2774                                                          unsigned char *ec)
2775 {
2776         const struct alps_model_info *model;
2777         int i;
2778
2779         for (i = 0; i < ARRAY_SIZE(alps_model_data); i++) {
2780                 model = &alps_model_data[i];
2781
2782                 if (!memcmp(e7, model->signature, sizeof(model->signature)) &&
2783                     (!model->command_mode_resp ||
2784                      model->command_mode_resp == ec[2])) {
2785
2786                         return &model->protocol_info;
2787                 }
2788         }
2789
2790         return NULL;
2791 }
2792
2793 static int alps_identify(struct psmouse *psmouse, struct alps_data *priv)
2794 {
2795         const struct alps_protocol_info *protocol;
2796         unsigned char e6[4], e7[4], ec[4];
2797         int error;
2798
2799         /*
2800          * First try "E6 report".
2801          * ALPS should return 0,0,10 or 0,0,100 if no buttons are pressed.
2802          * The bits 0-2 of the first byte will be 1s if some buttons are
2803          * pressed.
2804          */
2805         if (alps_rpt_cmd(psmouse, PSMOUSE_CMD_SETRES,
2806                          PSMOUSE_CMD_SETSCALE11, e6))
2807                 return -EIO;
2808
2809         if ((e6[0] & 0xf8) != 0 || e6[1] != 0 || (e6[2] != 10 && e6[2] != 100))
2810                 return -EINVAL;
2811
2812         /*
2813          * Now get the "E7" and "EC" reports.  These will uniquely identify
2814          * most ALPS touchpads.
2815          */
2816         if (alps_rpt_cmd(psmouse, PSMOUSE_CMD_SETRES,
2817                          PSMOUSE_CMD_SETSCALE21, e7) ||
2818             alps_rpt_cmd(psmouse, PSMOUSE_CMD_SETRES,
2819                          PSMOUSE_CMD_RESET_WRAP, ec) ||
2820             alps_exit_command_mode(psmouse))
2821                 return -EIO;
2822
2823         protocol = alps_match_table(e7, ec);
2824         if (!protocol) {
2825                 if (e7[0] == 0x73 && e7[1] == 0x02 && e7[2] == 0x64 &&
2826                            ec[2] == 0x8a) {
2827                         protocol = &alps_v4_protocol_data;
2828                 } else if (e7[0] == 0x73 && e7[1] == 0x03 && e7[2] == 0x50 &&
2829                            ec[0] == 0x73 && (ec[1] == 0x01 || ec[1] == 0x02)) {
2830                         protocol = &alps_v5_protocol_data;
2831                 } else if (ec[0] == 0x88 &&
2832                            ((ec[1] & 0xf0) == 0xb0 || (ec[1] & 0xf0) == 0xc0)) {
2833                         protocol = &alps_v7_protocol_data;
2834                 } else if (ec[0] == 0x88 && ec[1] == 0x08) {
2835                         protocol = &alps_v3_rushmore_data;
2836                 } else if (ec[0] == 0x88 && ec[1] == 0x07 &&
2837                            ec[2] >= 0x90 && ec[2] <= 0x9d) {
2838                         protocol = &alps_v3_protocol_data;
2839                 } else if (e7[0] == 0x73 && e7[1] == 0x03 &&
2840                            e7[2] == 0x14 && ec[1] == 0x02) {
2841                         protocol = &alps_v8_protocol_data;
2842                 } else if (e7[0] == 0x73 && e7[1] == 0x03 &&
2843                            e7[2] == 0x28 && ec[1] == 0x01) {
2844                         protocol = &alps_v8_protocol_data;
2845                 } else if (e7[0] == 0x73 && e7[1] == 0x03 && e7[2] == 0xc8) {
2846                         protocol = &alps_v9_protocol_data;
2847                         psmouse_warn(psmouse,
2848                                      "Unsupported ALPS V9 touchpad: E7=%3ph, EC=%3ph\n",
2849                                      e7, ec);
2850                         return -EINVAL;
2851                 } else {
2852                         psmouse_dbg(psmouse,
2853                                     "Likely not an ALPS touchpad: E7=%3ph, EC=%3ph\n", e7, ec);
2854                         return -EINVAL;
2855                 }
2856         }
2857
2858         if (priv) {
2859                 /* Save the Firmware version */
2860                 memcpy(priv->fw_ver, ec, 3);
2861                 error = alps_set_protocol(psmouse, priv, protocol);
2862                 if (error)
2863                         return error;
2864         }
2865
2866         return 0;
2867 }
2868
2869 static int alps_reconnect(struct psmouse *psmouse)
2870 {
2871         struct alps_data *priv = psmouse->private;
2872
2873         psmouse_reset(psmouse);
2874
2875         if (alps_identify(psmouse, priv) < 0)
2876                 return -1;
2877
2878         return priv->hw_init(psmouse);
2879 }
2880
2881 static void alps_disconnect(struct psmouse *psmouse)
2882 {
2883         struct alps_data *priv = psmouse->private;
2884
2885         psmouse_reset(psmouse);
2886         del_timer_sync(&priv->timer);
2887         if (priv->dev2)
2888                 input_unregister_device(priv->dev2);
2889         if (!IS_ERR_OR_NULL(priv->dev3))
2890                 input_unregister_device(priv->dev3);
2891         kfree(priv);
2892 }
2893
2894 static void alps_set_abs_params_st(struct alps_data *priv,
2895                                    struct input_dev *dev1)
2896 {
2897         input_set_abs_params(dev1, ABS_X, 0, priv->x_max, 0, 0);
2898         input_set_abs_params(dev1, ABS_Y, 0, priv->y_max, 0, 0);
2899         input_set_abs_params(dev1, ABS_PRESSURE, 0, 127, 0, 0);
2900 }
2901
2902 static void alps_set_abs_params_mt_common(struct alps_data *priv,
2903                                           struct input_dev *dev1)
2904 {
2905         input_set_abs_params(dev1, ABS_MT_POSITION_X, 0, priv->x_max, 0, 0);
2906         input_set_abs_params(dev1, ABS_MT_POSITION_Y, 0, priv->y_max, 0, 0);
2907
2908         input_abs_set_res(dev1, ABS_MT_POSITION_X, priv->x_res);
2909         input_abs_set_res(dev1, ABS_MT_POSITION_Y, priv->y_res);
2910
2911         set_bit(BTN_TOOL_TRIPLETAP, dev1->keybit);
2912         set_bit(BTN_TOOL_QUADTAP, dev1->keybit);
2913 }
2914
2915 static void alps_set_abs_params_semi_mt(struct alps_data *priv,
2916                                         struct input_dev *dev1)
2917 {
2918         alps_set_abs_params_mt_common(priv, dev1);
2919         input_set_abs_params(dev1, ABS_PRESSURE, 0, 127, 0, 0);
2920
2921         input_mt_init_slots(dev1, MAX_TOUCHES,
2922                             INPUT_MT_POINTER | INPUT_MT_DROP_UNUSED |
2923                                 INPUT_MT_SEMI_MT);
2924 }
2925
2926 static void alps_set_abs_params_v7(struct alps_data *priv,
2927                                    struct input_dev *dev1)
2928 {
2929         alps_set_abs_params_mt_common(priv, dev1);
2930         set_bit(BTN_TOOL_QUINTTAP, dev1->keybit);
2931
2932         input_mt_init_slots(dev1, MAX_TOUCHES,
2933                             INPUT_MT_POINTER | INPUT_MT_DROP_UNUSED |
2934                                 INPUT_MT_TRACK);
2935
2936         set_bit(BTN_TOOL_QUINTTAP, dev1->keybit);
2937 }
2938
2939 static void alps_set_abs_params_ss4_v2(struct alps_data *priv,
2940                                        struct input_dev *dev1)
2941 {
2942         alps_set_abs_params_mt_common(priv, dev1);
2943         input_set_abs_params(dev1, ABS_PRESSURE, 0, 127, 0, 0);
2944         set_bit(BTN_TOOL_QUINTTAP, dev1->keybit);
2945
2946         input_mt_init_slots(dev1, MAX_TOUCHES,
2947                             INPUT_MT_POINTER | INPUT_MT_DROP_UNUSED |
2948                                 INPUT_MT_TRACK);
2949 }
2950
2951 int alps_init(struct psmouse *psmouse)
2952 {
2953         struct alps_data *priv = psmouse->private;
2954         struct input_dev *dev1 = psmouse->dev;
2955         int error;
2956
2957         error = priv->hw_init(psmouse);
2958         if (error)
2959                 goto init_fail;
2960
2961         /*
2962          * Undo part of setup done for us by psmouse core since touchpad
2963          * is not a relative device.
2964          */
2965         __clear_bit(EV_REL, dev1->evbit);
2966         __clear_bit(REL_X, dev1->relbit);
2967         __clear_bit(REL_Y, dev1->relbit);
2968
2969         /*
2970          * Now set up our capabilities.
2971          */
2972         dev1->evbit[BIT_WORD(EV_KEY)] |= BIT_MASK(EV_KEY);
2973         dev1->keybit[BIT_WORD(BTN_TOUCH)] |= BIT_MASK(BTN_TOUCH);
2974         dev1->keybit[BIT_WORD(BTN_TOOL_FINGER)] |= BIT_MASK(BTN_TOOL_FINGER);
2975         dev1->keybit[BIT_WORD(BTN_LEFT)] |=
2976                 BIT_MASK(BTN_LEFT) | BIT_MASK(BTN_RIGHT);
2977
2978         dev1->evbit[BIT_WORD(EV_ABS)] |= BIT_MASK(EV_ABS);
2979
2980         priv->set_abs_params(priv, dev1);
2981
2982         if (priv->flags & ALPS_WHEEL) {
2983                 dev1->evbit[BIT_WORD(EV_REL)] |= BIT_MASK(EV_REL);
2984                 dev1->relbit[BIT_WORD(REL_WHEEL)] |= BIT_MASK(REL_WHEEL);
2985         }
2986
2987         if (priv->flags & (ALPS_FW_BK_1 | ALPS_FW_BK_2)) {
2988                 dev1->keybit[BIT_WORD(BTN_FORWARD)] |= BIT_MASK(BTN_FORWARD);
2989                 dev1->keybit[BIT_WORD(BTN_BACK)] |= BIT_MASK(BTN_BACK);
2990         }
2991
2992         if (priv->flags & ALPS_FOUR_BUTTONS) {
2993                 dev1->keybit[BIT_WORD(BTN_0)] |= BIT_MASK(BTN_0);
2994                 dev1->keybit[BIT_WORD(BTN_1)] |= BIT_MASK(BTN_1);
2995                 dev1->keybit[BIT_WORD(BTN_2)] |= BIT_MASK(BTN_2);
2996                 dev1->keybit[BIT_WORD(BTN_3)] |= BIT_MASK(BTN_3);
2997         } else if (priv->flags & ALPS_BUTTONPAD) {
2998                 set_bit(INPUT_PROP_BUTTONPAD, dev1->propbit);
2999                 clear_bit(BTN_RIGHT, dev1->keybit);
3000         } else {
3001                 dev1->keybit[BIT_WORD(BTN_MIDDLE)] |= BIT_MASK(BTN_MIDDLE);
3002         }
3003
3004         if (priv->flags & ALPS_DUALPOINT) {
3005                 struct input_dev *dev2;
3006
3007                 dev2 = input_allocate_device();
3008                 if (!dev2) {
3009                         psmouse_err(psmouse,
3010                                     "failed to allocate trackstick device\n");
3011                         error = -ENOMEM;
3012                         goto init_fail;
3013                 }
3014
3015                 snprintf(priv->phys2, sizeof(priv->phys2), "%s/input1",
3016                          psmouse->ps2dev.serio->phys);
3017                 dev2->phys = priv->phys2;
3018
3019                 /*
3020                  * format of input device name is: "protocol vendor name"
3021                  * see function psmouse_switch_protocol() in psmouse-base.c
3022                  */
3023                 dev2->name = "AlpsPS/2 ALPS DualPoint Stick";
3024
3025                 dev2->id.bustype = BUS_I8042;
3026                 dev2->id.vendor  = 0x0002;
3027                 dev2->id.product = PSMOUSE_ALPS;
3028                 dev2->id.version = priv->proto_version;
3029                 dev2->dev.parent = &psmouse->ps2dev.serio->dev;
3030
3031                 input_set_capability(dev2, EV_REL, REL_X);
3032                 input_set_capability(dev2, EV_REL, REL_Y);
3033                 if (priv->flags & ALPS_DUALPOINT_WITH_PRESSURE) {
3034                         input_set_capability(dev2, EV_ABS, ABS_PRESSURE);
3035                         input_set_abs_params(dev2, ABS_PRESSURE, 0, 127, 0, 0);
3036                 }
3037                 input_set_capability(dev2, EV_KEY, BTN_LEFT);
3038                 input_set_capability(dev2, EV_KEY, BTN_RIGHT);
3039                 input_set_capability(dev2, EV_KEY, BTN_MIDDLE);
3040
3041                 __set_bit(INPUT_PROP_POINTER, dev2->propbit);
3042                 __set_bit(INPUT_PROP_POINTING_STICK, dev2->propbit);
3043
3044                 error = input_register_device(dev2);
3045                 if (error) {
3046                         psmouse_err(psmouse,
3047                                     "failed to register trackstick device: %d\n",
3048                                     error);
3049                         input_free_device(dev2);
3050                         goto init_fail;
3051                 }
3052
3053                 priv->dev2 = dev2;
3054         }
3055
3056         priv->psmouse = psmouse;
3057
3058         INIT_DELAYED_WORK(&priv->dev3_register_work,
3059                           alps_register_bare_ps2_mouse);
3060
3061         psmouse->protocol_handler = alps_process_byte;
3062         psmouse->poll = alps_poll;
3063         psmouse->disconnect = alps_disconnect;
3064         psmouse->reconnect = alps_reconnect;
3065         psmouse->pktsize = priv->proto_version == ALPS_PROTO_V4 ? 8 : 6;
3066
3067         /* We are having trouble resyncing ALPS touchpads so disable it for now */
3068         psmouse->resync_time = 0;
3069
3070         /* Allow 2 invalid packets without resetting device */
3071         psmouse->resetafter = psmouse->pktsize * 2;
3072
3073         return 0;
3074
3075 init_fail:
3076         psmouse_reset(psmouse);
3077         /*
3078          * Even though we did not allocate psmouse->private we do free
3079          * it here.
3080          */
3081         kfree(psmouse->private);
3082         psmouse->private = NULL;
3083         return error;
3084 }
3085
3086 int alps_detect(struct psmouse *psmouse, bool set_properties)
3087 {
3088         struct alps_data *priv;
3089         int error;
3090
3091         error = alps_identify(psmouse, NULL);
3092         if (error)
3093                 return error;
3094
3095         /*
3096          * Reset the device to make sure it is fully operational:
3097          * on some laptops, like certain Dell Latitudes, we may
3098          * fail to properly detect presence of trackstick if device
3099          * has not been reset.
3100          */
3101         psmouse_reset(psmouse);
3102
3103         priv = kzalloc(sizeof(struct alps_data), GFP_KERNEL);
3104         if (!priv)
3105                 return -ENOMEM;
3106
3107         error = alps_identify(psmouse, priv);
3108         if (error) {
3109                 kfree(priv);
3110                 return error;
3111         }
3112
3113         if (set_properties) {
3114                 psmouse->vendor = "ALPS";
3115                 psmouse->name = priv->flags & ALPS_DUALPOINT ?
3116                                 "DualPoint TouchPad" : "GlidePoint";
3117                 psmouse->model = priv->proto_version;
3118         } else {
3119                 /*
3120                  * Destroy alps_data structure we allocated earlier since
3121                  * this was just a "trial run". Otherwise we'll keep it
3122                  * to be used by alps_init() which has to be called if
3123                  * we succeed and set_properties is true.
3124                  */
3125                 kfree(priv);
3126                 psmouse->private = NULL;
3127         }
3128
3129         return 0;
3130 }
3131