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         { { 0x73, 0x02, 0x64 }, 0x8a, { ALPS_PROTO_V4, 0x8f, 0x8f, 0 } },
 142 };
 143
 144 static const struct alps_protocol_info alps_v3_protocol_data = {
 145         ALPS_PROTO_V3, 0x8f, 0x8f, ALPS_DUALPOINT
 146 };
 147
 148 static const struct alps_protocol_info alps_v3_rushmore_data = {
 149         ALPS_PROTO_V3_RUSHMORE, 0x8f, 0x8f, ALPS_DUALPOINT
 150 };
 151
 152 static const struct alps_protocol_info alps_v5_protocol_data = {
 153         ALPS_PROTO_V5, 0xc8, 0xd8, 0
 154 };
 155
 156 static const struct alps_protocol_info alps_v7_protocol_data = {
 157         ALPS_PROTO_V7, 0x48, 0x48, ALPS_DUALPOINT
 158 };
 159
 160 static const struct alps_protocol_info alps_v8_protocol_data = {
 161         ALPS_PROTO_V8, 0x18, 0x18, 0
 162 };
 163
 164 /*
 165  * Some v2 models report the stick buttons in separate bits
 166  */
 167 static const struct dmi_system_id alps_dmi_has_separate_stick_buttons[] = {
 168 #if defined(CONFIG_DMI) && defined(CONFIG_X86)
 169         {
 170                 /* Extrapolated from other entries */
 171                 .matches = {
 172                         DMI_MATCH(DMI_SYS_VENDOR, "Dell Inc."),
 173                         DMI_MATCH(DMI_PRODUCT_NAME, "Latitude D420"),
 174                 },
 175         },
 176         {
 177                 /* Reported-by: Hans de Bruin <jmdebruin@xmsnet.nl> */
 178                 .matches = {
 179                         DMI_MATCH(DMI_SYS_VENDOR, "Dell Inc."),
 180                         DMI_MATCH(DMI_PRODUCT_NAME, "Latitude D430"),
 181                 },
 182         },
 183         {
 184                 /* Reported-by: Hans de Goede <hdegoede@redhat.com> */
 185                 .matches = {
 186                         DMI_MATCH(DMI_SYS_VENDOR, "Dell Inc."),
 187                         DMI_MATCH(DMI_PRODUCT_NAME, "Latitude D620"),
 188                 },
 189         },
 190         {
 191                 /* Extrapolated from other entries */
 192                 .matches = {
 193                         DMI_MATCH(DMI_SYS_VENDOR, "Dell Inc."),
 194                         DMI_MATCH(DMI_PRODUCT_NAME, "Latitude D630"),
 195                 },
 196         },
 197 #endif
 198         { }
 199 };
 200
 201 static void alps_set_abs_params_st(struct alps_data *priv,
 202                                    struct input_dev *dev1);
 203 static void alps_set_abs_params_semi_mt(struct alps_data *priv,
 204                                         struct input_dev *dev1);
 205 static void alps_set_abs_params_v7(struct alps_data *priv,
 206                                    struct input_dev *dev1);
 207 static void alps_set_abs_params_ss4_v2(struct alps_data *priv,
 208                                        struct input_dev *dev1);
 209
 210 /* Packet formats are described in Documentation/input/alps.txt */
 211
 212 static bool alps_is_valid_first_byte(struct alps_data *priv,
 213                                      unsigned char data)
 214 {
 215         return (data & priv->mask0) == priv->byte0;
 216 }
 217
 218 static void alps_report_buttons(struct input_dev *dev1, struct input_dev *dev2,
 219                                 int left, int right, int middle)
 220 {
 221         struct input_dev *dev;
 222
 223         /*
 224          * If shared button has already been reported on the
 225          * other device (dev2) then this event should be also
 226          * sent through that device.
 227          */
 228         dev = (dev2 && test_bit(BTN_LEFT, dev2->key)) ? dev2 : dev1;
 229         input_report_key(dev, BTN_LEFT, left);
 230
 231         dev = (dev2 && test_bit(BTN_RIGHT, dev2->key)) ? dev2 : dev1;
 232         input_report_key(dev, BTN_RIGHT, right);
 233
 234         dev = (dev2 && test_bit(BTN_MIDDLE, dev2->key)) ? dev2 : dev1;
 235         input_report_key(dev, BTN_MIDDLE, middle);
 236
 237         /*
 238          * Sync the _other_ device now, we'll do the first
 239          * device later once we report the rest of the events.
 240          */
 241         if (dev2)
 242                 input_sync(dev2);
 243 }
 244
 245 static void alps_process_packet_v1_v2(struct psmouse *psmouse)
 246 {
 247         struct alps_data *priv = psmouse->private;
 248         unsigned char *packet = psmouse->packet;
 249         struct input_dev *dev = psmouse->dev;
 250         struct input_dev *dev2 = priv->dev2;
 251         int x, y, z, ges, fin, left, right, middle;
 252         int back = 0, forward = 0;
 253
 254         if (priv->proto_version == ALPS_PROTO_V1) {
 255                 left = packet[2] & 0x10;
 256                 right = packet[2] & 0x08;
 257                 middle = 0;
 258                 x = packet[1] | ((packet[0] & 0x07) << 7);
 259                 y = packet[4] | ((packet[3] & 0x07) << 7);
 260                 z = packet[5];
 261         } else {
 262                 left = packet[3] & 1;
 263                 right = packet[3] & 2;
 264                 middle = packet[3] & 4;
 265                 x = packet[1] | ((packet[2] & 0x78) << (7 - 3));
 266                 y = packet[4] | ((packet[3] & 0x70) << (7 - 4));
 267                 z = packet[5];
 268         }
 269
 270         if (priv->flags & ALPS_FW_BK_1) {
 271                 back = packet[0] & 0x10;
 272                 forward = packet[2] & 4;
 273         }
 274
 275         if (priv->flags & ALPS_FW_BK_2) {
 276                 back = packet[3] & 4;
 277                 forward = packet[2] & 4;
 278                 if ((middle = forward && back))
 279                         forward = back = 0;
 280         }
 281
 282         ges = packet[2] & 1;
 283         fin = packet[2] & 2;
 284
 285         if ((priv->flags & ALPS_DUALPOINT) && z == 127) {
 286                 input_report_rel(dev2, REL_X,  (x > 383 ? (x - 768) : x));
 287                 input_report_rel(dev2, REL_Y, -(y > 255 ? (y - 512) : y));
 288
 289                 alps_report_buttons(dev2, dev, left, right, middle);
 290
 291                 input_sync(dev2);
 292                 return;
 293         }
 294
 295         /* Some models have separate stick button bits */
 296         if (priv->flags & ALPS_STICK_BITS) {
 297                 left |= packet[0] & 1;
 298                 right |= packet[0] & 2;
 299                 middle |= packet[0] & 4;
 300         }
 301
 302         alps_report_buttons(dev, dev2, left, right, middle);
 303
 304         /* Convert hardware tap to a reasonable Z value */
 305         if (ges && !fin)
 306                 z = 40;
 307
 308         /*
 309          * A "tap and drag" operation is reported by the hardware as a transition
 310          * from (!fin && ges) to (fin && ges). This should be translated to the
 311          * sequence Z>0, Z==0, Z>0, so the Z==0 event has to be generated manually.
 312          */
 313         if (ges && fin && !priv->prev_fin) {
 314                 input_report_abs(dev, ABS_X, x);
 315                 input_report_abs(dev, ABS_Y, y);
 316                 input_report_abs(dev, ABS_PRESSURE, 0);
 317                 input_report_key(dev, BTN_TOOL_FINGER, 0);
 318                 input_sync(dev);
 319         }
 320         priv->prev_fin = fin;
 321
 322         if (z > 30)
 323                 input_report_key(dev, BTN_TOUCH, 1);
 324         if (z < 25)
 325                 input_report_key(dev, BTN_TOUCH, 0);
 326
 327         if (z > 0) {
 328                 input_report_abs(dev, ABS_X, x);
 329                 input_report_abs(dev, ABS_Y, y);
 330         }
 331
 332         input_report_abs(dev, ABS_PRESSURE, z);
 333         input_report_key(dev, BTN_TOOL_FINGER, z > 0);
 334
 335         if (priv->flags & ALPS_WHEEL)
 336                 input_report_rel(dev, REL_WHEEL, ((packet[2] << 1) & 0x08) - ((packet[0] >> 4) & 0x07));
 337
 338         if (priv->flags & (ALPS_FW_BK_1 | ALPS_FW_BK_2)) {
 339                 input_report_key(dev, BTN_FORWARD, forward);
 340                 input_report_key(dev, BTN_BACK, back);
 341         }
 342
 343         if (priv->flags & ALPS_FOUR_BUTTONS) {
 344                 input_report_key(dev, BTN_0, packet[2] & 4);
 345                 input_report_key(dev, BTN_1, packet[0] & 0x10);
 346                 input_report_key(dev, BTN_2, packet[3] & 4);
 347                 input_report_key(dev, BTN_3, packet[0] & 0x20);
 348         }
 349
 350         input_sync(dev);
 351 }
 352
 353 static void alps_get_bitmap_points(unsigned int map,
 354                                    struct alps_bitmap_point *low,
 355                                    struct alps_bitmap_point *high,
 356                                    int *fingers)
 357 {
 358         struct alps_bitmap_point *point;
 359         int i, bit, prev_bit = 0;
 360
 361         point = low;
 362         for (i = 0; map != 0; i++, map >>= 1) {
 363                 bit = map & 1;
 364                 if (bit) {
 365                         if (!prev_bit) {
 366                                 point->start_bit = i;
 367                                 point->num_bits = 0;
 368                                 (*fingers)++;
 369                         }
 370                         point->num_bits++;
 371                 } else {
 372                         if (prev_bit)
 373                                 point = high;
 374                 }
 375                 prev_bit = bit;
 376         }
 377 }
 378
 379 /*
 380  * Process bitmap data from semi-mt protocols. Returns the number of
 381  * fingers detected. A return value of 0 means at least one of the
 382  * bitmaps was empty.
 383  *
 384  * The bitmaps don't have enough data to track fingers, so this function
 385  * only generates points representing a bounding box of all contacts.
 386  * These points are returned in fields->mt when the return value
 387  * is greater than 0.
 388  */
 389 static int alps_process_bitmap(struct alps_data *priv,
 390                                struct alps_fields *fields)
 391 {
 392         int i, fingers_x = 0, fingers_y = 0, fingers, closest;
 393         struct alps_bitmap_point x_low = {0,}, x_high = {0,};
 394         struct alps_bitmap_point y_low = {0,}, y_high = {0,};
 395         struct input_mt_pos corner[4];
 396
 397         if (!fields->x_map || !fields->y_map)
 398                 return 0;
 399
 400         alps_get_bitmap_points(fields->x_map, &x_low, &x_high, &fingers_x);
 401         alps_get_bitmap_points(fields->y_map, &y_low, &y_high, &fingers_y);
 402
 403         /*
 404          * Fingers can overlap, so we use the maximum count of fingers
 405          * on either axis as the finger count.
 406          */
 407         fingers = max(fingers_x, fingers_y);
 408
 409         /*
 410          * If an axis reports only a single contact, we have overlapping or
 411          * adjacent fingers. Divide the single contact between the two points.
 412          */
 413         if (fingers_x == 1) {
 414                 i = (x_low.num_bits - 1) / 2;
 415                 x_low.num_bits = x_low.num_bits - i;
 416                 x_high.start_bit = x_low.start_bit + i;
 417                 x_high.num_bits = max(i, 1);
 418         }
 419         if (fingers_y == 1) {
 420                 i = (y_low.num_bits - 1) / 2;
 421                 y_low.num_bits = y_low.num_bits - i;
 422                 y_high.start_bit = y_low.start_bit + i;
 423                 y_high.num_bits = max(i, 1);
 424         }
 425
 426         /* top-left corner */
 427         corner[0].x =
 428                 (priv->x_max * (2 * x_low.start_bit + x_low.num_bits - 1)) /
 429                 (2 * (priv->x_bits - 1));
 430         corner[0].y =
 431                 (priv->y_max * (2 * y_low.start_bit + y_low.num_bits - 1)) /
 432                 (2 * (priv->y_bits - 1));
 433
 434         /* top-right corner */
 435         corner[1].x =
 436                 (priv->x_max * (2 * x_high.start_bit + x_high.num_bits - 1)) /
 437                 (2 * (priv->x_bits - 1));
 438         corner[1].y =
 439                 (priv->y_max * (2 * y_low.start_bit + y_low.num_bits - 1)) /
 440                 (2 * (priv->y_bits - 1));
 441
 442         /* bottom-right corner */
 443         corner[2].x =
 444                 (priv->x_max * (2 * x_high.start_bit + x_high.num_bits - 1)) /
 445                 (2 * (priv->x_bits - 1));
 446         corner[2].y =
 447                 (priv->y_max * (2 * y_high.start_bit + y_high.num_bits - 1)) /
 448                 (2 * (priv->y_bits - 1));
 449
 450         /* bottom-left corner */
 451         corner[3].x =
 452                 (priv->x_max * (2 * x_low.start_bit + x_low.num_bits - 1)) /
 453                 (2 * (priv->x_bits - 1));
 454         corner[3].y =
 455                 (priv->y_max * (2 * y_high.start_bit + y_high.num_bits - 1)) /
 456                 (2 * (priv->y_bits - 1));
 457
 458         /* x-bitmap order is reversed on v5 touchpads  */
 459         if (priv->proto_version == ALPS_PROTO_V5) {
 460                 for (i = 0; i < 4; i++)
 461                         corner[i].x = priv->x_max - corner[i].x;
 462         }
 463
 464         /* y-bitmap order is reversed on v3 and v4 touchpads  */
 465         if (priv->proto_version == ALPS_PROTO_V3 ||
 466             priv->proto_version == ALPS_PROTO_V4) {
 467                 for (i = 0; i < 4; i++)
 468                         corner[i].y = priv->y_max - corner[i].y;
 469         }
 470
 471         /*
 472          * We only select a corner for the second touch once per 2 finger
 473          * touch sequence to avoid the chosen corner (and thus the coordinates)
 474          * jumping around when the first touch is in the middle.
 475          */
 476         if (priv->second_touch == -1) {
 477                 /* Find corner closest to our st coordinates */
 478                 closest = 0x7fffffff;
 479                 for (i = 0; i < 4; i++) {
 480                         int dx = fields->st.x - corner[i].x;
 481                         int dy = fields->st.y - corner[i].y;
 482                         int distance = dx * dx + dy * dy;
 483
 484                         if (distance < closest) {
 485                                 priv->second_touch = i;
 486                                 closest = distance;
 487                         }
 488                 }
 489                 /* And select the opposite corner to use for the 2nd touch */
 490                 priv->second_touch = (priv->second_touch + 2) % 4;
 491         }
 492
 493         fields->mt[0] = fields->st;
 494         fields->mt[1] = corner[priv->second_touch];
 495
 496         return fingers;
 497 }
 498
 499 static void alps_set_slot(struct input_dev *dev, int slot, int x, int y)
 500 {
 501         input_mt_slot(dev, slot);
 502         input_mt_report_slot_state(dev, MT_TOOL_FINGER, true);
 503         input_report_abs(dev, ABS_MT_POSITION_X, x);
 504         input_report_abs(dev, ABS_MT_POSITION_Y, y);
 505 }
 506
 507 static void alps_report_mt_data(struct psmouse *psmouse, int n)
 508 {
 509         struct alps_data *priv = psmouse->private;
 510         struct input_dev *dev = psmouse->dev;
 511         struct alps_fields *f = &priv->f;
 512         int i, slot[MAX_TOUCHES];
 513
 514         input_mt_assign_slots(dev, slot, f->mt, n, 0);
 515         for (i = 0; i < n; i++)
 516                 alps_set_slot(dev, slot[i], f->mt[i].x, f->mt[i].y);
 517
 518         input_mt_sync_frame(dev);
 519 }
 520
 521 static void alps_report_semi_mt_data(struct psmouse *psmouse, int fingers)
 522 {
 523         struct alps_data *priv = psmouse->private;
 524         struct input_dev *dev = psmouse->dev;
 525         struct alps_fields *f = &priv->f;
 526
 527         /* Use st data when we don't have mt data */
 528         if (fingers < 2) {
 529                 f->mt[0].x = f->st.x;
 530                 f->mt[0].y = f->st.y;
 531                 fingers = f->pressure > 0 ? 1 : 0;
 532                 priv->second_touch = -1;
 533         }
 534
 535         if (fingers >= 1)
 536                 alps_set_slot(dev, 0, f->mt[0].x, f->mt[0].y);
 537         if (fingers >= 2)
 538                 alps_set_slot(dev, 1, f->mt[1].x, f->mt[1].y);
 539         input_mt_sync_frame(dev);
 540
 541         input_mt_report_finger_count(dev, fingers);
 542
 543         input_report_key(dev, BTN_LEFT, f->left);
 544         input_report_key(dev, BTN_RIGHT, f->right);
 545         input_report_key(dev, BTN_MIDDLE, f->middle);
 546
 547         input_report_abs(dev, ABS_PRESSURE, f->pressure);
 548
 549         input_sync(dev);
 550 }
 551
 552 static void alps_process_trackstick_packet_v3(struct psmouse *psmouse)
 553 {
 554         struct alps_data *priv = psmouse->private;
 555         unsigned char *packet = psmouse->packet;
 556         struct input_dev *dev = priv->dev2;
 557         int x, y, z, left, right, middle;
 558
 559         /* It should be a DualPoint when received trackstick packet */
 560         if (!(priv->flags & ALPS_DUALPOINT)) {
 561                 psmouse_warn(psmouse,
 562                              "Rejected trackstick packet from non DualPoint device");
 563                 return;
 564         }
 565
 566         /* Sanity check packet */
 567         if (!(packet[0] & 0x40)) {
 568                 psmouse_dbg(psmouse, "Bad trackstick packet, discarding\n");
 569                 return;
 570         }
 571
 572         /*
 573          * There's a special packet that seems to indicate the end
 574          * of a stream of trackstick data. Filter these out.
 575          */
 576         if (packet[1] == 0x7f && packet[2] == 0x7f && packet[4] == 0x7f)
 577                 return;
 578
 579         x = (s8)(((packet[0] & 0x20) << 2) | (packet[1] & 0x7f));
 580         y = (s8)(((packet[0] & 0x10) << 3) | (packet[2] & 0x7f));
 581         z = (packet[4] & 0x7c) >> 2;
 582
 583         /*
 584          * The x and y values tend to be quite large, and when used
 585          * alone the trackstick is difficult to use. Scale them down
 586          * to compensate.
 587          */
 588         x /= 8;
 589         y /= 8;
 590
 591         input_report_rel(dev, REL_X, x);
 592         input_report_rel(dev, REL_Y, -y);
 593
 594         /*
 595          * Most ALPS models report the trackstick buttons in the touchpad
 596          * packets, but a few report them here. No reliable way has been
 597          * found to differentiate between the models upfront, so we enable
 598          * the quirk in response to seeing a button press in the trackstick
 599          * packet.
 600          */
 601         left = packet[3] & 0x01;
 602         right = packet[3] & 0x02;
 603         middle = packet[3] & 0x04;
 604
 605         if (!(priv->quirks & ALPS_QUIRK_TRACKSTICK_BUTTONS) &&
 606             (left || right || middle))
 607                 priv->quirks |= ALPS_QUIRK_TRACKSTICK_BUTTONS;
 608
 609         if (priv->quirks & ALPS_QUIRK_TRACKSTICK_BUTTONS) {
 610                 input_report_key(dev, BTN_LEFT, left);
 611                 input_report_key(dev, BTN_RIGHT, right);
 612                 input_report_key(dev, BTN_MIDDLE, middle);
 613         }
 614
 615         input_sync(dev);
 616         return;
 617 }
 618
 619 static void alps_decode_buttons_v3(struct alps_fields *f, unsigned char *p)
 620 {
 621         f->left = !!(p[3] & 0x01);
 622         f->right = !!(p[3] & 0x02);
 623         f->middle = !!(p[3] & 0x04);
 624
 625         f->ts_left = !!(p[3] & 0x10);
 626         f->ts_right = !!(p[3] & 0x20);
 627         f->ts_middle = !!(p[3] & 0x40);
 628 }
 629
 630 static int alps_decode_pinnacle(struct alps_fields *f, unsigned char *p,
 631                                  struct psmouse *psmouse)
 632 {
 633         f->first_mp = !!(p[4] & 0x40);
 634         f->is_mp = !!(p[0] & 0x40);
 635
 636         if (f->is_mp) {
 637                 f->fingers = (p[5] & 0x3) + 1;
 638                 f->x_map = ((p[4] & 0x7e) << 8) |
 639                            ((p[1] & 0x7f) << 2) |
 640                            ((p[0] & 0x30) >> 4);
 641                 f->y_map = ((p[3] & 0x70) << 4) |
 642                            ((p[2] & 0x7f) << 1) |
 643                            (p[4] & 0x01);
 644         } else {
 645                 f->st.x = ((p[1] & 0x7f) << 4) | ((p[4] & 0x30) >> 2) |
 646                        ((p[0] & 0x30) >> 4);
 647                 f->st.y = ((p[2] & 0x7f) << 4) | (p[4] & 0x0f);
 648                 f->pressure = p[5] & 0x7f;
 649
 650                 alps_decode_buttons_v3(f, p);
 651         }
 652
 653         return 0;
 654 }
 655
 656 static int alps_decode_rushmore(struct alps_fields *f, unsigned char *p,
 657                                  struct psmouse *psmouse)
 658 {
 659         f->first_mp = !!(p[4] & 0x40);
 660         f->is_mp = !!(p[5] & 0x40);
 661
 662         if (f->is_mp) {
 663                 f->fingers = max((p[5] & 0x3), ((p[5] >> 2) & 0x3)) + 1;
 664                 f->x_map = ((p[5] & 0x10) << 11) |
 665                            ((p[4] & 0x7e) << 8) |
 666                            ((p[1] & 0x7f) << 2) |
 667                            ((p[0] & 0x30) >> 4);
 668                 f->y_map = ((p[5] & 0x20) << 6) |
 669                            ((p[3] & 0x70) << 4) |
 670                            ((p[2] & 0x7f) << 1) |
 671                            (p[4] & 0x01);
 672         } else {
 673                 f->st.x = ((p[1] & 0x7f) << 4) | ((p[4] & 0x30) >> 2) |
 674                        ((p[0] & 0x30) >> 4);
 675                 f->st.y = ((p[2] & 0x7f) << 4) | (p[4] & 0x0f);
 676                 f->pressure = p[5] & 0x7f;
 677
 678                 alps_decode_buttons_v3(f, p);
 679         }
 680
 681         return 0;
 682 }
 683
 684 static int alps_decode_dolphin(struct alps_fields *f, unsigned char *p,
 685                                 struct psmouse *psmouse)
 686 {
 687         u64 palm_data = 0;
 688         struct alps_data *priv = psmouse->private;
 689
 690         f->first_mp = !!(p[0] & 0x02);
 691         f->is_mp = !!(p[0] & 0x20);
 692
 693         if (!f->is_mp) {
 694                 f->st.x = ((p[1] & 0x7f) | ((p[4] & 0x0f) << 7));
 695                 f->st.y = ((p[2] & 0x7f) | ((p[4] & 0xf0) << 3));
 696                 f->pressure = (p[0] & 4) ? 0 : p[5] & 0x7f;
 697                 alps_decode_buttons_v3(f, p);
 698         } else {
 699                 f->fingers = ((p[0] & 0x6) >> 1 |
 700                      (p[0] & 0x10) >> 2);
 701
 702                 palm_data = (p[1] & 0x7f) |
 703                             ((p[2] & 0x7f) << 7) |
 704                             ((p[4] & 0x7f) << 14) |
 705                             ((p[5] & 0x7f) << 21) |
 706                             ((p[3] & 0x07) << 28) |
 707                             (((u64)p[3] & 0x70) << 27) |
 708                             (((u64)p[0] & 0x01) << 34);
 709
 710                 /* Y-profile is stored in P(0) to p(n-1), n = y_bits; */
 711                 f->y_map = palm_data & (BIT(priv->y_bits) - 1);
 712
 713                 /* X-profile is stored in p(n) to p(n+m-1), m = x_bits; */
 714                 f->x_map = (palm_data >> priv->y_bits) &
 715                            (BIT(priv->x_bits) - 1);
 716         }
 717
 718         return 0;
 719 }
 720
 721 static void alps_process_touchpad_packet_v3_v5(struct psmouse *psmouse)
 722 {
 723         struct alps_data *priv = psmouse->private;
 724         unsigned char *packet = psmouse->packet;
 725         struct input_dev *dev2 = priv->dev2;
 726         struct alps_fields *f = &priv->f;
 727         int fingers = 0;
 728
 729         memset(f, 0, sizeof(*f));
 730
 731         priv->decode_fields(f, packet, psmouse);
 732
 733         /*
 734          * There's no single feature of touchpad position and bitmap packets
 735          * that can be used to distinguish between them. We rely on the fact
 736          * that a bitmap packet should always follow a position packet with
 737          * bit 6 of packet[4] set.
 738          */
 739         if (priv->multi_packet) {
 740                 /*
 741                  * Sometimes a position packet will indicate a multi-packet
 742                  * sequence, but then what follows is another position
 743                  * packet. Check for this, and when it happens process the
 744                  * position packet as usual.
 745                  */
 746                 if (f->is_mp) {
 747                         fingers = f->fingers;
 748                         /*
 749                          * Bitmap processing uses position packet's coordinate
 750                          * data, so we need to do decode it first.
 751                          */
 752                         priv->decode_fields(f, priv->multi_data, psmouse);
 753                         if (alps_process_bitmap(priv, f) == 0)
 754                                 fingers = 0; /* Use st data */
 755                 } else {
 756                         priv->multi_packet = 0;
 757                 }
 758         }
 759
 760         /*
 761          * Bit 6 of byte 0 is not usually set in position packets. The only
 762          * times it seems to be set is in situations where the data is
 763          * suspect anyway, e.g. a palm resting flat on the touchpad. Given
 764          * this combined with the fact that this bit is useful for filtering
 765          * out misidentified bitmap packets, we reject anything with this
 766          * bit set.
 767          */
 768         if (f->is_mp)
 769                 return;
 770
 771         if (!priv->multi_packet && f->first_mp) {
 772                 priv->multi_packet = 1;
 773                 memcpy(priv->multi_data, packet, sizeof(priv->multi_data));
 774                 return;
 775         }
 776
 777         priv->multi_packet = 0;
 778
 779         /*
 780          * Sometimes the hardware sends a single packet with z = 0
 781          * in the middle of a stream. Real releases generate packets
 782          * with x, y, and z all zero, so these seem to be flukes.
 783          * Ignore them.
 784          */
 785         if (f->st.x && f->st.y && !f->pressure)
 786                 return;
 787
 788         alps_report_semi_mt_data(psmouse, fingers);
 789
 790         if ((priv->flags & ALPS_DUALPOINT) &&
 791             !(priv->quirks & ALPS_QUIRK_TRACKSTICK_BUTTONS)) {
 792                 input_report_key(dev2, BTN_LEFT, f->ts_left);
 793                 input_report_key(dev2, BTN_RIGHT, f->ts_right);
 794                 input_report_key(dev2, BTN_MIDDLE, f->ts_middle);
 795                 input_sync(dev2);
 796         }
 797 }
 798
 799 static void alps_process_packet_v3(struct psmouse *psmouse)
 800 {
 801         unsigned char *packet = psmouse->packet;
 802
 803         /*
 804          * v3 protocol packets come in three types, two representing
 805          * touchpad data and one representing trackstick data.
 806          * Trackstick packets seem to be distinguished by always
 807          * having 0x3f in the last byte. This value has never been
 808          * observed in the last byte of either of the other types
 809          * of packets.
 810          */
 811         if (packet[5] == 0x3f) {
 812                 alps_process_trackstick_packet_v3(psmouse);
 813                 return;
 814         }
 815
 816         alps_process_touchpad_packet_v3_v5(psmouse);
 817 }
 818
 819 static void alps_process_packet_v6(struct psmouse *psmouse)
 820 {
 821         struct alps_data *priv = psmouse->private;
 822         unsigned char *packet = psmouse->packet;
 823         struct input_dev *dev = psmouse->dev;
 824         struct input_dev *dev2 = priv->dev2;
 825         int x, y, z, left, right, middle;
 826
 827         /*
 828          * We can use Byte5 to distinguish if the packet is from Touchpad
 829          * or Trackpoint.
 830          * Touchpad:    0 - 0x7E
 831          * Trackpoint:  0x7F
 832          */
 833         if (packet[5] == 0x7F) {
 834                 /* It should be a DualPoint when received Trackpoint packet */
 835                 if (!(priv->flags & ALPS_DUALPOINT)) {
 836                         psmouse_warn(psmouse,
 837                                      "Rejected trackstick packet from non DualPoint device");
 838                         return;
 839                 }
 840
 841                 /* Trackpoint packet */
 842                 x = packet[1] | ((packet[3] & 0x20) << 2);
 843                 y = packet[2] | ((packet[3] & 0x40) << 1);
 844                 z = packet[4];
 845                 left = packet[3] & 0x01;
 846                 right = packet[3] & 0x02;
 847                 middle = packet[3] & 0x04;
 848
 849                 /* To prevent the cursor jump when finger lifted */
 850                 if (x == 0x7F && y == 0x7F && z == 0x7F)
 851                         x = y = z = 0;
 852
 853                 /* Divide 4 since trackpoint's speed is too fast */
 854                 input_report_rel(dev2, REL_X, (char)x / 4);
 855                 input_report_rel(dev2, REL_Y, -((char)y / 4));
 856
 857                 input_report_key(dev2, BTN_LEFT, left);
 858                 input_report_key(dev2, BTN_RIGHT, right);
 859                 input_report_key(dev2, BTN_MIDDLE, middle);
 860
 861                 input_sync(dev2);
 862                 return;
 863         }
 864
 865         /* Touchpad packet */
 866         x = packet[1] | ((packet[3] & 0x78) << 4);
 867         y = packet[2] | ((packet[4] & 0x78) << 4);
 868         z = packet[5];
 869         left = packet[3] & 0x01;
 870         right = packet[3] & 0x02;
 871
 872         if (z > 30)
 873                 input_report_key(dev, BTN_TOUCH, 1);
 874         if (z < 25)
 875                 input_report_key(dev, BTN_TOUCH, 0);
 876
 877         if (z > 0) {
 878                 input_report_abs(dev, ABS_X, x);
 879                 input_report_abs(dev, ABS_Y, y);
 880         }
 881
 882         input_report_abs(dev, ABS_PRESSURE, z);
 883         input_report_key(dev, BTN_TOOL_FINGER, z > 0);
 884
 885         /* v6 touchpad does not have middle button */
 886         input_report_key(dev, BTN_LEFT, left);
 887         input_report_key(dev, BTN_RIGHT, right);
 888
 889         input_sync(dev);
 890 }
 891
 892 static void alps_process_packet_v4(struct psmouse *psmouse)
 893 {
 894         struct alps_data *priv = psmouse->private;
 895         unsigned char *packet = psmouse->packet;
 896         struct alps_fields *f = &priv->f;
 897         int offset;
 898
 899         /*
 900          * v4 has a 6-byte encoding for bitmap data, but this data is
 901          * broken up between 3 normal packets. Use priv->multi_packet to
 902          * track our position in the bitmap packet.
 903          */
 904         if (packet[6] & 0x40) {
 905                 /* sync, reset position */
 906                 priv->multi_packet = 0;
 907         }
 908
 909         if (WARN_ON_ONCE(priv->multi_packet > 2))
 910                 return;
 911
 912         offset = 2 * priv->multi_packet;
 913         priv->multi_data[offset] = packet[6];
 914         priv->multi_data[offset + 1] = packet[7];
 915
 916         f->left = !!(packet[4] & 0x01);
 917         f->right = !!(packet[4] & 0x02);
 918
 919         f->st.x = ((packet[1] & 0x7f) << 4) | ((packet[3] & 0x30) >> 2) |
 920                   ((packet[0] & 0x30) >> 4);
 921         f->st.y = ((packet[2] & 0x7f) << 4) | (packet[3] & 0x0f);
 922         f->pressure = packet[5] & 0x7f;
 923
 924         if (++priv->multi_packet > 2) {
 925                 priv->multi_packet = 0;
 926
 927                 f->x_map = ((priv->multi_data[2] & 0x1f) << 10) |
 928                            ((priv->multi_data[3] & 0x60) << 3) |
 929                            ((priv->multi_data[0] & 0x3f) << 2) |
 930                            ((priv->multi_data[1] & 0x60) >> 5);
 931                 f->y_map = ((priv->multi_data[5] & 0x01) << 10) |
 932                            ((priv->multi_data[3] & 0x1f) << 5) |
 933                             (priv->multi_data[1] & 0x1f);
 934
 935                 f->fingers = alps_process_bitmap(priv, f);
 936         }
 937
 938         alps_report_semi_mt_data(psmouse, f->fingers);
 939 }
 940
 941 static bool alps_is_valid_package_v7(struct psmouse *psmouse)
 942 {
 943         switch (psmouse->pktcnt) {
 944         case 3:
 945                 return (psmouse->packet[2] & 0x40) == 0x40;
 946         case 4:
 947                 return (psmouse->packet[3] & 0x48) == 0x48;
 948         case 6:
 949                 return (psmouse->packet[5] & 0x40) == 0x00;
 950         }
 951         return true;
 952 }
 953
 954 static unsigned char alps_get_packet_id_v7(char *byte)
 955 {
 956         unsigned char packet_id;
 957
 958         if (byte[4] & 0x40)
 959                 packet_id = V7_PACKET_ID_TWO;
 960         else if (byte[4] & 0x01)
 961                 packet_id = V7_PACKET_ID_MULTI;
 962         else if ((byte[0] & 0x10) && !(byte[4] & 0x43))
 963                 packet_id = V7_PACKET_ID_NEW;
 964         else if (byte[1] == 0x00 && byte[4] == 0x00)
 965                 packet_id = V7_PACKET_ID_IDLE;
 966         else
 967                 packet_id = V7_PACKET_ID_UNKNOWN;
 968
 969         return packet_id;
 970 }
 971
 972 static void alps_get_finger_coordinate_v7(struct input_mt_pos *mt,
 973                                           unsigned char *pkt,
 974                                           unsigned char pkt_id)
 975 {
 976         mt[0].x = ((pkt[2] & 0x80) << 4);
 977         mt[0].x |= ((pkt[2] & 0x3F) << 5);
 978         mt[0].x |= ((pkt[3] & 0x30) >> 1);
 979         mt[0].x |= (pkt[3] & 0x07);
 980         mt[0].y = (pkt[1] << 3) | (pkt[0] & 0x07);
 981
 982         mt[1].x = ((pkt[3] & 0x80) << 4);
 983         mt[1].x |= ((pkt[4] & 0x80) << 3);
 984         mt[1].x |= ((pkt[4] & 0x3F) << 4);
 985         mt[1].y = ((pkt[5] & 0x80) << 3);
 986         mt[1].y |= ((pkt[5] & 0x3F) << 4);
 987
 988         switch (pkt_id) {
 989         case V7_PACKET_ID_TWO:
 990                 mt[1].x &= ~0x000F;
 991                 mt[1].y |= 0x000F;
 992                 /* Detect false-postive touches where x & y report max value */
 993                 if (mt[1].y == 0x7ff && mt[1].x == 0xff0) {
 994                         mt[1].x = 0;
 995                         /* y gets set to 0 at the end of this function */
 996                 }
 997                 break;
 998
 999         case V7_PACKET_ID_MULTI:
1000                 mt[1].x &= ~0x003F;
1001                 mt[1].y &= ~0x0020;
1002                 mt[1].y |= ((pkt[4] & 0x02) << 4);
1003                 mt[1].y |= 0x001F;
1004                 break;
1005
1006         case V7_PACKET_ID_NEW:
1007                 mt[1].x &= ~0x003F;
1008                 mt[1].x |= (pkt[0] & 0x20);
1009                 mt[1].y |= 0x000F;
1010                 break;
1011         }
1012
1013         mt[0].y = 0x7FF - mt[0].y;
1014         mt[1].y = 0x7FF - mt[1].y;
1015 }
1016
1017 static int alps_get_mt_count(struct input_mt_pos *mt)
1018 {
1019         int i, fingers = 0;
1020
1021         for (i = 0; i < MAX_TOUCHES; i++) {
1022                 if (mt[i].x != 0 || mt[i].y != 0)
1023                         fingers++;
1024         }
1025
1026         return fingers;
1027 }
1028
1029 static int alps_decode_packet_v7(struct alps_fields *f,
1030                                   unsigned char *p,
1031                                   struct psmouse *psmouse)
1032 {
1033         struct alps_data *priv = psmouse->private;
1034         unsigned char pkt_id;
1035
1036         pkt_id = alps_get_packet_id_v7(p);
1037         if (pkt_id == V7_PACKET_ID_IDLE)
1038                 return 0;
1039         if (pkt_id == V7_PACKET_ID_UNKNOWN)
1040                 return -1;
1041         /*
1042          * NEW packets are send to indicate a discontinuity in the finger
1043          * coordinate reporting. Specifically a finger may have moved from
1044          * slot 0 to 1 or vice versa. INPUT_MT_TRACK takes care of this for
1045          * us.
1046          *
1047          * NEW packets have 3 problems:
1048          * 1) They do not contain middle / right button info (on non clickpads)
1049          *    this can be worked around by preserving the old button state
1050          * 2) They do not contain an accurate fingercount, and they are
1051          *    typically send when the number of fingers changes. We cannot use
1052          *    the old finger count as that may mismatch with the amount of
1053          *    touch coordinates we've available in the NEW packet
1054          * 3) Their x data for the second touch is inaccurate leading to
1055          *    a possible jump of the x coordinate by 16 units when the first
1056          *    non NEW packet comes in
1057          * Since problems 2 & 3 cannot be worked around, just ignore them.
1058          */
1059         if (pkt_id == V7_PACKET_ID_NEW)
1060                 return 1;
1061
1062         alps_get_finger_coordinate_v7(f->mt, p, pkt_id);
1063
1064         if (pkt_id == V7_PACKET_ID_TWO)
1065                 f->fingers = alps_get_mt_count(f->mt);
1066         else /* pkt_id == V7_PACKET_ID_MULTI */
1067                 f->fingers = 3 + (p[5] & 0x03);
1068
1069         f->left = (p[0] & 0x80) >> 7;
1070         if (priv->flags & ALPS_BUTTONPAD) {
1071                 if (p[0] & 0x20)
1072                         f->fingers++;
1073                 if (p[0] & 0x10)
1074                         f->fingers++;
1075         } else {
1076                 f->right = (p[0] & 0x20) >> 5;
1077                 f->middle = (p[0] & 0x10) >> 4;
1078         }
1079
1080         /* Sometimes a single touch is reported in mt[1] rather then mt[0] */
1081         if (f->fingers == 1 && f->mt[0].x == 0 && f->mt[0].y == 0) {
1082                 f->mt[0].x = f->mt[1].x;
1083                 f->mt[0].y = f->mt[1].y;
1084                 f->mt[1].x = 0;
1085                 f->mt[1].y = 0;
1086         }
1087
1088         return 0;
1089 }
1090
1091 static void alps_process_trackstick_packet_v7(struct psmouse *psmouse)
1092 {
1093         struct alps_data *priv = psmouse->private;
1094         unsigned char *packet = psmouse->packet;
1095         struct input_dev *dev2 = priv->dev2;
1096         int x, y, z, left, right, middle;
1097
1098         /* It should be a DualPoint when received trackstick packet */
1099         if (!(priv->flags & ALPS_DUALPOINT)) {
1100                 psmouse_warn(psmouse,
1101                              "Rejected trackstick packet from non DualPoint device");
1102                 return;
1103         }
1104
1105         x = ((packet[2] & 0xbf)) | ((packet[3] & 0x10) << 2);
1106         y = (packet[3] & 0x07) | (packet[4] & 0xb8) |
1107             ((packet[3] & 0x20) << 1);
1108         z = (packet[5] & 0x3f) | ((packet[3] & 0x80) >> 1);
1109
1110         left = (packet[1] & 0x01);
1111         right = (packet[1] & 0x02) >> 1;
1112         middle = (packet[1] & 0x04) >> 2;
1113
1114         input_report_rel(dev2, REL_X, (char)x);
1115         input_report_rel(dev2, REL_Y, -((char)y));
1116
1117         input_report_key(dev2, BTN_LEFT, left);
1118         input_report_key(dev2, BTN_RIGHT, right);
1119         input_report_key(dev2, BTN_MIDDLE, middle);
1120
1121         input_sync(dev2);
1122 }
1123
1124 static void alps_process_touchpad_packet_v7(struct psmouse *psmouse)
1125 {
1126         struct alps_data *priv = psmouse->private;
1127         struct input_dev *dev = psmouse->dev;
1128         struct alps_fields *f = &priv->f;
1129
1130         memset(f, 0, sizeof(*f));
1131
1132         if (priv->decode_fields(f, psmouse->packet, psmouse))
1133                 return;
1134
1135         alps_report_mt_data(psmouse, alps_get_mt_count(f->mt));
1136
1137         input_mt_report_finger_count(dev, f->fingers);
1138
1139         input_report_key(dev, BTN_LEFT, f->left);
1140         input_report_key(dev, BTN_RIGHT, f->right);
1141         input_report_key(dev, BTN_MIDDLE, f->middle);
1142
1143         input_sync(dev);
1144 }
1145
1146 static void alps_process_packet_v7(struct psmouse *psmouse)
1147 {
1148         unsigned char *packet = psmouse->packet;
1149
1150         if (packet[0] == 0x48 && (packet[4] & 0x47) == 0x06)
1151                 alps_process_trackstick_packet_v7(psmouse);
1152         else
1153                 alps_process_touchpad_packet_v7(psmouse);
1154 }
1155
1156 static unsigned char alps_get_pkt_id_ss4_v2(unsigned char *byte)
1157 {
1158         unsigned char pkt_id = SS4_PACKET_ID_IDLE;
1159
1160         switch (byte[3] & 0x30) {
1161         case 0x00:
1162                 if (byte[0] == 0x18 && byte[1] == 0x10 && byte[2] == 0x00 &&
1163                     (byte[3] & 0x88) == 0x08 && byte[4] == 0x10 &&
1164                     byte[5] == 0x00) {
1165                         pkt_id = SS4_PACKET_ID_IDLE;
1166                 } else {
1167                         pkt_id = SS4_PACKET_ID_ONE;
1168                 }
1169                 break;
1170         case 0x10:
1171                 /* two-finger finger positions */
1172                 pkt_id = SS4_PACKET_ID_TWO;
1173                 break;
1174         case 0x20:
1175                 /* stick pointer */
1176                 pkt_id = SS4_PACKET_ID_STICK;
1177                 break;
1178         case 0x30:
1179                 /* third and fourth finger positions */
1180                 pkt_id = SS4_PACKET_ID_MULTI;
1181                 break;
1182         }
1183
1184         return pkt_id;
1185 }
1186
1187 static int alps_decode_ss4_v2(struct alps_fields *f,
1188                               unsigned char *p, struct psmouse *psmouse)
1189 {
1190         struct alps_data *priv = psmouse->private;
1191         unsigned char pkt_id;
1192         unsigned int no_data_x, no_data_y;
1193
1194         pkt_id = alps_get_pkt_id_ss4_v2(p);
1195
1196         /* Current packet is 1Finger coordinate packet */
1197         switch (pkt_id) {
1198         case SS4_PACKET_ID_ONE:
1199                 f->mt[0].x = SS4_1F_X_V2(p);
1200                 f->mt[0].y = SS4_1F_Y_V2(p);
1201                 f->pressure = ((SS4_1F_Z_V2(p)) * 2) & 0x7f;
1202                 /*
1203                  * When a button is held the device will give us events
1204                  * with x, y, and pressure of 0. This causes annoying jumps
1205                  * if a touch is released while the button is held.
1206                  * Handle this by claiming zero contacts.
1207                  */
1208                 f->fingers = f->pressure > 0 ? 1 : 0;
1209                 f->first_mp = 0;
1210                 f->is_mp = 0;
1211                 break;
1212
1213         case SS4_PACKET_ID_TWO:
1214                 if (priv->flags & ALPS_BUTTONPAD) {
1215                         if (IS_SS4PLUS_DEV(priv->dev_id)) {
1216                                 f->mt[0].x = SS4_PLUS_BTL_MF_X_V2(p, 0);
1217                                 f->mt[1].x = SS4_PLUS_BTL_MF_X_V2(p, 1);
1218                         } else {
1219                                 f->mt[0].x = SS4_BTL_MF_X_V2(p, 0);
1220                                 f->mt[1].x = SS4_BTL_MF_X_V2(p, 1);
1221                         }
1222                         f->mt[0].y = SS4_BTL_MF_Y_V2(p, 0);
1223                         f->mt[1].y = SS4_BTL_MF_Y_V2(p, 1);
1224                 } else {
1225                         if (IS_SS4PLUS_DEV(priv->dev_id)) {
1226                                 f->mt[0].x = SS4_PLUS_STD_MF_X_V2(p, 0);
1227                                 f->mt[1].x = SS4_PLUS_STD_MF_X_V2(p, 1);
1228                         } else {
1229                                 f->mt[0].x = SS4_STD_MF_X_V2(p, 0);
1230                                 f->mt[1].x = SS4_STD_MF_X_V2(p, 1);
1231                         }
1232                         f->mt[0].y = SS4_STD_MF_Y_V2(p, 0);
1233                         f->mt[1].y = SS4_STD_MF_Y_V2(p, 1);
1234                 }
1235                 f->pressure = SS4_MF_Z_V2(p, 0) ? 0x30 : 0;
1236
1237                 if (SS4_IS_MF_CONTINUE(p)) {
1238                         f->first_mp = 1;
1239                 } else {
1240                         f->fingers = 2;
1241                         f->first_mp = 0;
1242                 }
1243                 f->is_mp = 0;
1244
1245                 break;
1246
1247         case SS4_PACKET_ID_MULTI:
1248                 if (priv->flags & ALPS_BUTTONPAD) {
1249                         if (IS_SS4PLUS_DEV(priv->dev_id)) {
1250                                 f->mt[2].x = SS4_PLUS_BTL_MF_X_V2(p, 0);
1251                                 f->mt[3].x = SS4_PLUS_BTL_MF_X_V2(p, 1);
1252                                 no_data_x = SS4_PLUS_MFPACKET_NO_AX_BL;
1253                         } else {
1254                                 f->mt[2].x = SS4_BTL_MF_X_V2(p, 0);
1255                                 f->mt[3].x = SS4_BTL_MF_X_V2(p, 1);
1256                                 no_data_x = SS4_MFPACKET_NO_AX_BL;
1257                         }
1258                         no_data_y = SS4_MFPACKET_NO_AY_BL;
1259
1260                         f->mt[2].y = SS4_BTL_MF_Y_V2(p, 0);
1261                         f->mt[3].y = SS4_BTL_MF_Y_V2(p, 1);
1262                 } else {
1263                         if (IS_SS4PLUS_DEV(priv->dev_id)) {
1264                                 f->mt[2].x = SS4_PLUS_STD_MF_X_V2(p, 0);
1265                                 f->mt[3].x = SS4_PLUS_STD_MF_X_V2(p, 1);
1266                                 no_data_x = SS4_PLUS_MFPACKET_NO_AX;
1267                         } else {
1268                                 f->mt[2].x = SS4_STD_MF_X_V2(p, 0);
1269                                 f->mt[3].x = SS4_STD_MF_X_V2(p, 1);
1270                                 no_data_x = SS4_MFPACKET_NO_AX;
1271                         }
1272                         no_data_y = SS4_MFPACKET_NO_AY;
1273
1274                         f->mt[2].y = SS4_STD_MF_Y_V2(p, 0);
1275                         f->mt[3].y = SS4_STD_MF_Y_V2(p, 1);
1276                 }
1277
1278                 f->first_mp = 0;
1279                 f->is_mp = 1;
1280
1281                 if (SS4_IS_5F_DETECTED(p)) {
1282                         f->fingers = 5;
1283                 } else if (f->mt[3].x == no_data_x &&
1284                              f->mt[3].y == no_data_y) {
1285                         f->mt[3].x = 0;
1286                         f->mt[3].y = 0;
1287                         f->fingers = 3;
1288                 } else {
1289                         f->fingers = 4;
1290                 }
1291                 break;
1292
1293         case SS4_PACKET_ID_STICK:
1294                 if (!(priv->flags & ALPS_DUALPOINT)) {
1295                         psmouse_warn(psmouse,
1296                                      "Rejected trackstick packet from non DualPoint device");
1297                 } else {
1298                         int x = (s8)(((p[0] & 1) << 7) | (p[1] & 0x7f));
1299                         int y = (s8)(((p[3] & 1) << 7) | (p[2] & 0x7f));
1300                         int pressure = (s8)(p[4] & 0x7f);
1301
1302                         input_report_rel(priv->dev2, REL_X, x);
1303                         input_report_rel(priv->dev2, REL_Y, -y);
1304                         input_report_abs(priv->dev2, ABS_PRESSURE, pressure);
1305                 }
1306                 break;
1307
1308         case SS4_PACKET_ID_IDLE:
1309         default:
1310                 memset(f, 0, sizeof(struct alps_fields));
1311                 break;
1312         }
1313
1314         /* handle buttons */
1315         if (pkt_id == SS4_PACKET_ID_STICK) {
1316                 f->ts_left = !!(SS4_BTN_V2(p) & 0x01);
1317                 f->ts_right = !!(SS4_BTN_V2(p) & 0x02);
1318                 f->ts_middle = !!(SS4_BTN_V2(p) & 0x04);
1319         } else {
1320                 f->left = !!(SS4_BTN_V2(p) & 0x01);
1321                 if (!(priv->flags & ALPS_BUTTONPAD)) {
1322                         f->right = !!(SS4_BTN_V2(p) & 0x02);
1323                         f->middle = !!(SS4_BTN_V2(p) & 0x04);
1324                 }
1325         }
1326
1327         return 0;
1328 }
1329
1330 static void alps_process_packet_ss4_v2(struct psmouse *psmouse)
1331 {
1332         struct alps_data *priv = psmouse->private;
1333         unsigned char *packet = psmouse->packet;
1334         struct input_dev *dev = psmouse->dev;
1335         struct input_dev *dev2 = priv->dev2;
1336         struct alps_fields *f = &priv->f;
1337
1338         memset(f, 0, sizeof(struct alps_fields));
1339         priv->decode_fields(f, packet, psmouse);
1340         if (priv->multi_packet) {
1341                 /*
1342                  * Sometimes the first packet will indicate a multi-packet
1343                  * sequence, but sometimes the next multi-packet would not
1344                  * come. Check for this, and when it happens process the
1345                  * position packet as usual.
1346                  */
1347                 if (f->is_mp) {
1348                         /* Now process the 1st packet */
1349                         priv->decode_fields(f, priv->multi_data, psmouse);
1350                 } else {
1351                         priv->multi_packet = 0;
1352                 }
1353         }
1354
1355         /*
1356          * "f.is_mp" would always be '0' after merging the 1st and 2nd packet.
1357          * When it is set, it means 2nd packet comes without 1st packet come.
1358          */
1359         if (f->is_mp)
1360                 return;
1361
1362         /* Save the first packet */
1363         if (!priv->multi_packet && f->first_mp) {
1364                 priv->multi_packet = 1;
1365                 memcpy(priv->multi_data, packet, sizeof(priv->multi_data));
1366                 return;
1367         }
1368
1369         priv->multi_packet = 0;
1370
1371         /* Report trackstick */
1372         if (alps_get_pkt_id_ss4_v2(packet) == SS4_PACKET_ID_STICK) {
1373                 if (priv->flags & ALPS_DUALPOINT) {
1374                         input_report_key(dev2, BTN_LEFT, f->ts_left);
1375                         input_report_key(dev2, BTN_RIGHT, f->ts_right);
1376                         input_report_key(dev2, BTN_MIDDLE, f->ts_middle);
1377                         input_sync(dev2);
1378                 }
1379                 return;
1380         }
1381
1382         /* Report touchpad */
1383         alps_report_mt_data(psmouse, (f->fingers <= 4) ? f->fingers : 4);
1384
1385         input_mt_report_finger_count(dev, f->fingers);
1386
1387         input_report_key(dev, BTN_LEFT, f->left);
1388         input_report_key(dev, BTN_RIGHT, f->right);
1389         input_report_key(dev, BTN_MIDDLE, f->middle);
1390
1391         input_report_abs(dev, ABS_PRESSURE, f->pressure);
1392         input_sync(dev);
1393 }
1394
1395 static bool alps_is_valid_package_ss4_v2(struct psmouse *psmouse)
1396 {
1397         if (psmouse->pktcnt == 4 && ((psmouse->packet[3] & 0x08) != 0x08))
1398                 return false;
1399         if (psmouse->pktcnt == 6 && ((psmouse->packet[5] & 0x10) != 0x0))
1400                 return false;
1401         return true;
1402 }
1403
1404 static DEFINE_MUTEX(alps_mutex);
1405
1406 static void alps_register_bare_ps2_mouse(struct work_struct *work)
1407 {
1408         struct alps_data *priv =
1409                 container_of(work, struct alps_data, dev3_register_work.work);
1410         struct psmouse *psmouse = priv->psmouse;
1411         struct input_dev *dev3;
1412         int error = 0;
1413
1414         mutex_lock(&alps_mutex);
1415
1416         if (priv->dev3)
1417                 goto out;
1418
1419         dev3 = input_allocate_device();
1420         if (!dev3) {
1421                 psmouse_err(psmouse, "failed to allocate secondary device\n");
1422                 error = -ENOMEM;
1423                 goto out;
1424         }
1425
1426         snprintf(priv->phys3, sizeof(priv->phys3), "%s/%s",
1427                  psmouse->ps2dev.serio->phys,
1428                  (priv->dev2 ? "input2" : "input1"));
1429         dev3->phys = priv->phys3;
1430
1431         /*
1432          * format of input device name is: "protocol vendor name"
1433          * see function psmouse_switch_protocol() in psmouse-base.c
1434          */
1435         dev3->name = "PS/2 ALPS Mouse";
1436
1437         dev3->id.bustype = BUS_I8042;
1438         dev3->id.vendor  = 0x0002;
1439         dev3->id.product = PSMOUSE_PS2;
1440         dev3->id.version = 0x0000;
1441         dev3->dev.parent = &psmouse->ps2dev.serio->dev;
1442
1443         input_set_capability(dev3, EV_REL, REL_X);
1444         input_set_capability(dev3, EV_REL, REL_Y);
1445         input_set_capability(dev3, EV_KEY, BTN_LEFT);
1446         input_set_capability(dev3, EV_KEY, BTN_RIGHT);
1447         input_set_capability(dev3, EV_KEY, BTN_MIDDLE);
1448
1449         __set_bit(INPUT_PROP_POINTER, dev3->propbit);
1450
1451         error = input_register_device(dev3);
1452         if (error) {
1453                 psmouse_err(psmouse,
1454                             "failed to register secondary device: %d\n",
1455                             error);
1456                 input_free_device(dev3);
1457                 goto out;
1458         }
1459
1460         priv->dev3 = dev3;
1461
1462 out:
1463         /*
1464          * Save the error code so that we can detect that we
1465          * already tried to create the device.
1466          */
1467         if (error)
1468                 priv->dev3 = ERR_PTR(error);
1469
1470         mutex_unlock(&alps_mutex);
1471 }
1472
1473 static void alps_report_bare_ps2_packet(struct psmouse *psmouse,
1474                                         unsigned char packet[],
1475                                         bool report_buttons)
1476 {
1477         struct alps_data *priv = psmouse->private;
1478         struct input_dev *dev, *dev2 = NULL;
1479
1480         /* Figure out which device to use to report the bare packet */
1481         if (priv->proto_version == ALPS_PROTO_V2 &&
1482             (priv->flags & ALPS_DUALPOINT)) {
1483                 /* On V2 devices the DualPoint Stick reports bare packets */
1484                 dev = priv->dev2;
1485                 dev2 = psmouse->dev;
1486         } else if (unlikely(IS_ERR_OR_NULL(priv->dev3))) {
1487                 /* Register dev3 mouse if we received PS/2 packet first time */
1488                 if (!IS_ERR(priv->dev3))
1489                         psmouse_queue_work(psmouse, &priv->dev3_register_work,
1490                                            0);
1491                 return;
1492         } else {
1493                 dev = priv->dev3;
1494         }
1495
1496         if (report_buttons)
1497                 alps_report_buttons(dev, dev2,
1498                                 packet[0] & 1, packet[0] & 2, packet[0] & 4);
1499
1500         input_report_rel(dev, REL_X,
1501                 packet[1] ? packet[1] - ((packet[0] << 4) & 0x100) : 0);
1502         input_report_rel(dev, REL_Y,
1503                 packet[2] ? ((packet[0] << 3) & 0x100) - packet[2] : 0);
1504
1505         input_sync(dev);
1506 }
1507
1508 static psmouse_ret_t alps_handle_interleaved_ps2(struct psmouse *psmouse)
1509 {
1510         struct alps_data *priv = psmouse->private;
1511
1512         if (psmouse->pktcnt < 6)
1513                 return PSMOUSE_GOOD_DATA;
1514
1515         if (psmouse->pktcnt == 6) {
1516                 /*
1517                  * Start a timer to flush the packet if it ends up last
1518                  * 6-byte packet in the stream. Timer needs to fire
1519                  * psmouse core times out itself. 20 ms should be enough
1520                  * to decide if we are getting more data or not.
1521                  */
1522                 mod_timer(&priv->timer, jiffies + msecs_to_jiffies(20));
1523                 return PSMOUSE_GOOD_DATA;
1524         }
1525
1526         del_timer(&priv->timer);
1527
1528         if (psmouse->packet[6] & 0x80) {
1529
1530                 /*
1531                  * Highest bit is set - that means we either had
1532                  * complete ALPS packet and this is start of the
1533                  * next packet or we got garbage.
1534                  */
1535
1536                 if (((psmouse->packet[3] |
1537                       psmouse->packet[4] |
1538                       psmouse->packet[5]) & 0x80) ||
1539                     (!alps_is_valid_first_byte(priv, psmouse->packet[6]))) {
1540                         psmouse_dbg(psmouse,
1541                                     "refusing packet %4ph (suspected interleaved ps/2)\n",
1542                                     psmouse->packet + 3);
1543                         return PSMOUSE_BAD_DATA;
1544                 }
1545
1546                 priv->process_packet(psmouse);
1547
1548                 /* Continue with the next packet */
1549                 psmouse->packet[0] = psmouse->packet[6];
1550                 psmouse->pktcnt = 1;
1551
1552         } else {
1553
1554                 /*
1555                  * High bit is 0 - that means that we indeed got a PS/2
1556                  * packet in the middle of ALPS packet.
1557                  *
1558                  * There is also possibility that we got 6-byte ALPS
1559                  * packet followed  by 3-byte packet from trackpoint. We
1560                  * can not distinguish between these 2 scenarios but
1561                  * because the latter is unlikely to happen in course of
1562                  * normal operation (user would need to press all
1563                  * buttons on the pad and start moving trackpoint
1564                  * without touching the pad surface) we assume former.
1565                  * Even if we are wrong the wost thing that would happen
1566                  * the cursor would jump but we should not get protocol
1567                  * de-synchronization.
1568                  */
1569
1570                 alps_report_bare_ps2_packet(psmouse, &psmouse->packet[3],
1571                                             false);
1572
1573                 /*
1574                  * Continue with the standard ALPS protocol handling,
1575                  * but make sure we won't process it as an interleaved
1576                  * packet again, which may happen if all buttons are
1577                  * pressed. To avoid this let's reset the 4th bit which
1578                  * is normally 1.
1579                  */
1580                 psmouse->packet[3] = psmouse->packet[6] & 0xf7;
1581                 psmouse->pktcnt = 4;
1582         }
1583
1584         return PSMOUSE_GOOD_DATA;
1585 }
1586
1587 static void alps_flush_packet(unsigned long data)
1588 {
1589         struct psmouse *psmouse = (struct psmouse *)data;
1590         struct alps_data *priv = psmouse->private;
1591
1592         serio_pause_rx(psmouse->ps2dev.serio);
1593
1594         if (psmouse->pktcnt == psmouse->pktsize) {
1595
1596                 /*
1597                  * We did not any more data in reasonable amount of time.
1598                  * Validate the last 3 bytes and process as a standard
1599                  * ALPS packet.
1600                  */
1601                 if ((psmouse->packet[3] |
1602                      psmouse->packet[4] |
1603                      psmouse->packet[5]) & 0x80) {
1604                         psmouse_dbg(psmouse,
1605                                     "refusing packet %3ph (suspected interleaved ps/2)\n",
1606                                     psmouse->packet + 3);
1607                 } else {
1608                         priv->process_packet(psmouse);
1609                 }
1610                 psmouse->pktcnt = 0;
1611         }
1612
1613         serio_continue_rx(psmouse->ps2dev.serio);
1614 }
1615
1616 static psmouse_ret_t alps_process_byte(struct psmouse *psmouse)
1617 {
1618         struct alps_data *priv = psmouse->private;
1619
1620         /*
1621          * Check if we are dealing with a bare PS/2 packet, presumably from
1622          * a device connected to the external PS/2 port. Because bare PS/2
1623          * protocol does not have enough constant bits to self-synchronize
1624          * properly we only do this if the device is fully synchronized.
1625          * Can not distinguish V8's first byte from PS/2 packet's
1626          */
1627         if (priv->proto_version != ALPS_PROTO_V8 &&
1628             !psmouse->out_of_sync_cnt &&
1629             (psmouse->packet[0] & 0xc8) == 0x08) {
1630
1631                 if (psmouse->pktcnt == 3) {
1632                         alps_report_bare_ps2_packet(psmouse, psmouse->packet,
1633                                                     true);
1634                         return PSMOUSE_FULL_PACKET;
1635                 }
1636                 return PSMOUSE_GOOD_DATA;
1637         }
1638
1639         /* Check for PS/2 packet stuffed in the middle of ALPS packet. */
1640
1641         if ((priv->flags & ALPS_PS2_INTERLEAVED) &&
1642             psmouse->pktcnt >= 4 && (psmouse->packet[3] & 0x0f) == 0x0f) {
1643                 return alps_handle_interleaved_ps2(psmouse);
1644         }
1645
1646         if (!alps_is_valid_first_byte(priv, psmouse->packet[0])) {
1647                 psmouse_dbg(psmouse,
1648                             "refusing packet[0] = %x (mask0 = %x, byte0 = %x)\n",
1649                             psmouse->packet[0], priv->mask0, priv->byte0);
1650                 return PSMOUSE_BAD_DATA;
1651         }
1652
1653         /* Bytes 2 - pktsize should have 0 in the highest bit */
1654         if (priv->proto_version < ALPS_PROTO_V5 &&
1655             psmouse->pktcnt >= 2 && psmouse->pktcnt <= psmouse->pktsize &&
1656             (psmouse->packet[psmouse->pktcnt - 1] & 0x80)) {
1657                 psmouse_dbg(psmouse, "refusing packet[%i] = %x\n",
1658                             psmouse->pktcnt - 1,
1659                             psmouse->packet[psmouse->pktcnt - 1]);
1660
1661                 if (priv->proto_version == ALPS_PROTO_V3_RUSHMORE &&
1662                     psmouse->pktcnt == psmouse->pktsize) {
1663                         /*
1664                          * Some Dell boxes, such as Latitude E6440 or E7440
1665                          * with closed lid, quite often smash last byte of
1666                          * otherwise valid packet with 0xff. Given that the
1667                          * next packet is very likely to be valid let's
1668                          * report PSMOUSE_FULL_PACKET but not process data,
1669                          * rather than reporting PSMOUSE_BAD_DATA and
1670                          * filling the logs.
1671                          */
1672                         return PSMOUSE_FULL_PACKET;
1673                 }
1674
1675                 return PSMOUSE_BAD_DATA;
1676         }
1677
1678         if ((priv->proto_version == ALPS_PROTO_V7 &&
1679                         !alps_is_valid_package_v7(psmouse)) ||
1680             (priv->proto_version == ALPS_PROTO_V8 &&
1681                         !alps_is_valid_package_ss4_v2(psmouse))) {
1682                 psmouse_dbg(psmouse, "refusing packet[%i] = %x\n",
1683                             psmouse->pktcnt - 1,
1684                             psmouse->packet[psmouse->pktcnt - 1]);
1685                 return PSMOUSE_BAD_DATA;
1686         }
1687
1688         if (psmouse->pktcnt == psmouse->pktsize) {
1689                 priv->process_packet(psmouse);
1690                 return PSMOUSE_FULL_PACKET;
1691         }
1692
1693         return PSMOUSE_GOOD_DATA;
1694 }
1695
1696 static int alps_command_mode_send_nibble(struct psmouse *psmouse, int nibble)
1697 {
1698         struct ps2dev *ps2dev = &psmouse->ps2dev;
1699         struct alps_data *priv = psmouse->private;
1700         int command;
1701         unsigned char *param;
1702         unsigned char dummy[4];
1703
1704         BUG_ON(nibble > 0xf);
1705
1706         command = priv->nibble_commands[nibble].command;
1707         param = (command & 0x0f00) ?
1708                 dummy : (unsigned char *)&priv->nibble_commands[nibble].data;
1709
1710         if (ps2_command(ps2dev, param, command))
1711                 return -1;
1712
1713         return 0;
1714 }
1715
1716 static int alps_command_mode_set_addr(struct psmouse *psmouse, int addr)
1717 {
1718         struct ps2dev *ps2dev = &psmouse->ps2dev;
1719         struct alps_data *priv = psmouse->private;
1720         int i, nibble;
1721
1722         if (ps2_command(ps2dev, NULL, priv->addr_command))
1723                 return -1;
1724
1725         for (i = 12; i >= 0; i -= 4) {
1726                 nibble = (addr >> i) & 0xf;
1727                 if (alps_command_mode_send_nibble(psmouse, nibble))
1728                         return -1;
1729         }
1730
1731         return 0;
1732 }
1733
1734 static int __alps_command_mode_read_reg(struct psmouse *psmouse, int addr)
1735 {
1736         struct ps2dev *ps2dev = &psmouse->ps2dev;
1737         unsigned char param[4];
1738
1739         if (ps2_command(ps2dev, param, PSMOUSE_CMD_GETINFO))
1740                 return -1;
1741
1742         /*
1743          * The address being read is returned in the first two bytes
1744          * of the result. Check that this address matches the expected
1745          * address.
1746          */
1747         if (addr != ((param[0] << 8) | param[1]))
1748                 return -1;
1749
1750         return param[2];
1751 }
1752
1753 static int alps_command_mode_read_reg(struct psmouse *psmouse, int addr)
1754 {
1755         if (alps_command_mode_set_addr(psmouse, addr))
1756                 return -1;
1757         return __alps_command_mode_read_reg(psmouse, addr);
1758 }
1759
1760 static int __alps_command_mode_write_reg(struct psmouse *psmouse, u8 value)
1761 {
1762         if (alps_command_mode_send_nibble(psmouse, (value >> 4) & 0xf))
1763                 return -1;
1764         if (alps_command_mode_send_nibble(psmouse, value & 0xf))
1765                 return -1;
1766         return 0;
1767 }
1768
1769 static int alps_command_mode_write_reg(struct psmouse *psmouse, int addr,
1770                                        u8 value)
1771 {
1772         if (alps_command_mode_set_addr(psmouse, addr))
1773                 return -1;
1774         return __alps_command_mode_write_reg(psmouse, value);
1775 }
1776
1777 static int alps_rpt_cmd(struct psmouse *psmouse, int init_command,
1778                         int repeated_command, unsigned char *param)
1779 {
1780         struct ps2dev *ps2dev = &psmouse->ps2dev;
1781
1782         param[0] = 0;
1783         if (init_command && ps2_command(ps2dev, param, init_command))
1784                 return -EIO;
1785
1786         if (ps2_command(ps2dev,  NULL, repeated_command) ||
1787             ps2_command(ps2dev,  NULL, repeated_command) ||
1788             ps2_command(ps2dev,  NULL, repeated_command))
1789                 return -EIO;
1790
1791         param[0] = param[1] = param[2] = 0xff;
1792         if (ps2_command(ps2dev, param, PSMOUSE_CMD_GETINFO))
1793                 return -EIO;
1794
1795         psmouse_dbg(psmouse, "%2.2X report: %3ph\n",
1796                     repeated_command, param);
1797         return 0;
1798 }
1799
1800 static bool alps_check_valid_firmware_id(unsigned char id[])
1801 {
1802         if (id[0] == 0x73)
1803                 return true;
1804
1805         if (id[0] == 0x88 &&
1806             (id[1] == 0x07 ||
1807              id[1] == 0x08 ||
1808              (id[1] & 0xf0) == 0xb0 ||
1809              (id[1] & 0xf0) == 0xc0)) {
1810                 return true;
1811         }
1812
1813         return false;
1814 }
1815
1816 static int alps_enter_command_mode(struct psmouse *psmouse)
1817 {
1818         unsigned char param[4];
1819
1820         if (alps_rpt_cmd(psmouse, 0, PSMOUSE_CMD_RESET_WRAP, param)) {
1821                 psmouse_err(psmouse, "failed to enter command mode\n");
1822                 return -1;
1823         }
1824
1825         if (!alps_check_valid_firmware_id(param)) {
1826                 psmouse_dbg(psmouse,
1827                             "unknown response while entering command mode\n");
1828                 return -1;
1829         }
1830         return 0;
1831 }
1832
1833 static inline int alps_exit_command_mode(struct psmouse *psmouse)
1834 {
1835         struct ps2dev *ps2dev = &psmouse->ps2dev;
1836         if (ps2_command(ps2dev, NULL, PSMOUSE_CMD_SETSTREAM))
1837                 return -1;
1838         return 0;
1839 }
1840
1841 /*
1842  * For DualPoint devices select the device that should respond to
1843  * subsequent commands. It looks like glidepad is behind stickpointer,
1844  * I'd thought it would be other way around...
1845  */
1846 static int alps_passthrough_mode_v2(struct psmouse *psmouse, bool enable)
1847 {
1848         struct ps2dev *ps2dev = &psmouse->ps2dev;
1849         int cmd = enable ? PSMOUSE_CMD_SETSCALE21 : PSMOUSE_CMD_SETSCALE11;
1850
1851         if (ps2_command(ps2dev, NULL, cmd) ||
1852             ps2_command(ps2dev, NULL, cmd) ||
1853             ps2_command(ps2dev, NULL, cmd) ||
1854             ps2_command(ps2dev, NULL, PSMOUSE_CMD_DISABLE))
1855                 return -1;
1856
1857         /* we may get 3 more bytes, just ignore them */
1858         ps2_drain(ps2dev, 3, 100);
1859
1860         return 0;
1861 }
1862
1863 static int alps_absolute_mode_v1_v2(struct psmouse *psmouse)
1864 {
1865         struct ps2dev *ps2dev = &psmouse->ps2dev;
1866
1867         /* Try ALPS magic knock - 4 disable before enable */
1868         if (ps2_command(ps2dev, NULL, PSMOUSE_CMD_DISABLE) ||
1869             ps2_command(ps2dev, NULL, PSMOUSE_CMD_DISABLE) ||
1870             ps2_command(ps2dev, NULL, PSMOUSE_CMD_DISABLE) ||
1871             ps2_command(ps2dev, NULL, PSMOUSE_CMD_DISABLE) ||
1872             ps2_command(ps2dev, NULL, PSMOUSE_CMD_ENABLE))
1873                 return -1;
1874
1875         /*
1876          * Switch mouse to poll (remote) mode so motion data will not
1877          * get in our way
1878          */
1879         return ps2_command(&psmouse->ps2dev, NULL, PSMOUSE_CMD_SETPOLL);
1880 }
1881
1882 static int alps_monitor_mode_send_word(struct psmouse *psmouse, u16 word)
1883 {
1884         int i, nibble;
1885
1886         /*
1887          * b0-b11 are valid bits, send sequence is inverse.
1888          * e.g. when word = 0x0123, nibble send sequence is 3, 2, 1
1889          */
1890         for (i = 0; i <= 8; i += 4) {
1891                 nibble = (word >> i) & 0xf;
1892                 if (alps_command_mode_send_nibble(psmouse, nibble))
1893                         return -1;
1894         }
1895
1896         return 0;
1897 }
1898
1899 static int alps_monitor_mode_write_reg(struct psmouse *psmouse,
1900                                        u16 addr, u16 value)
1901 {
1902         struct ps2dev *ps2dev = &psmouse->ps2dev;
1903
1904         /* 0x0A0 is the command to write the word */
1905         if (ps2_command(ps2dev, NULL, PSMOUSE_CMD_ENABLE) ||
1906             alps_monitor_mode_send_word(psmouse, 0x0A0) ||
1907             alps_monitor_mode_send_word(psmouse, addr) ||
1908             alps_monitor_mode_send_word(psmouse, value) ||
1909             ps2_command(ps2dev, NULL, PSMOUSE_CMD_DISABLE))
1910                 return -1;
1911
1912         return 0;
1913 }
1914
1915 static int alps_monitor_mode(struct psmouse *psmouse, bool enable)
1916 {
1917         struct ps2dev *ps2dev = &psmouse->ps2dev;
1918
1919         if (enable) {
1920                 /* EC E9 F5 F5 E7 E6 E7 E9 to enter monitor mode */
1921                 if (ps2_command(ps2dev, NULL, PSMOUSE_CMD_RESET_WRAP) ||
1922                     ps2_command(ps2dev, NULL, PSMOUSE_CMD_GETINFO) ||
1923                     ps2_command(ps2dev, NULL, PSMOUSE_CMD_DISABLE) ||
1924                     ps2_command(ps2dev, NULL, PSMOUSE_CMD_DISABLE) ||
1925                     ps2_command(ps2dev, NULL, PSMOUSE_CMD_SETSCALE21) ||
1926                     ps2_command(ps2dev, NULL, PSMOUSE_CMD_SETSCALE11) ||
1927                     ps2_command(ps2dev, NULL, PSMOUSE_CMD_SETSCALE21) ||
1928                     ps2_command(ps2dev, NULL, PSMOUSE_CMD_GETINFO))
1929                         return -1;
1930         } else {
1931                 /* EC to exit monitor mode */
1932                 if (ps2_command(ps2dev, NULL, PSMOUSE_CMD_RESET_WRAP))
1933                         return -1;
1934         }
1935
1936         return 0;
1937 }
1938
1939 static int alps_absolute_mode_v6(struct psmouse *psmouse)
1940 {
1941         u16 reg_val = 0x181;
1942         int ret = -1;
1943
1944         /* enter monitor mode, to write the register */
1945         if (alps_monitor_mode(psmouse, true))
1946                 return -1;
1947
1948         ret = alps_monitor_mode_write_reg(psmouse, 0x000, reg_val);
1949
1950         if (alps_monitor_mode(psmouse, false))
1951                 ret = -1;
1952
1953         return ret;
1954 }
1955
1956 static int alps_get_status(struct psmouse *psmouse, char *param)
1957 {
1958         /* Get status: 0xF5 0xF5 0xF5 0xE9 */
1959         if (alps_rpt_cmd(psmouse, 0, PSMOUSE_CMD_DISABLE, param))
1960                 return -1;
1961
1962         return 0;
1963 }
1964
1965 /*
1966  * Turn touchpad tapping on or off. The sequences are:
1967  * 0xE9 0xF5 0xF5 0xF3 0x0A to enable,
1968  * 0xE9 0xF5 0xF5 0xE8 0x00 to disable.
1969  * My guess that 0xE9 (GetInfo) is here as a sync point.
1970  * For models that also have stickpointer (DualPoints) its tapping
1971  * is controlled separately (0xE6 0xE6 0xE6 0xF3 0x14|0x0A) but
1972  * we don't fiddle with it.
1973  */
1974 static int alps_tap_mode(struct psmouse *psmouse, int enable)
1975 {
1976         struct ps2dev *ps2dev = &psmouse->ps2dev;
1977         int cmd = enable ? PSMOUSE_CMD_SETRATE : PSMOUSE_CMD_SETRES;
1978         unsigned char tap_arg = enable ? 0x0A : 0x00;
1979         unsigned char param[4];
1980
1981         if (ps2_command(ps2dev, param, PSMOUSE_CMD_GETINFO) ||
1982             ps2_command(ps2dev, NULL, PSMOUSE_CMD_DISABLE) ||
1983             ps2_command(ps2dev, NULL, PSMOUSE_CMD_DISABLE) ||
1984             ps2_command(ps2dev, &tap_arg, cmd))
1985                 return -1;
1986
1987         if (alps_get_status(psmouse, param))
1988                 return -1;
1989
1990         return 0;
1991 }
1992
1993 /*
1994  * alps_poll() - poll the touchpad for current motion packet.
1995  * Used in resync.
1996  */
1997 static int alps_poll(struct psmouse *psmouse)
1998 {
1999         struct alps_data *priv = psmouse->private;
2000         unsigned char buf[sizeof(psmouse->packet)];
2001         bool poll_failed;
2002
2003         if (priv->flags & ALPS_PASS)
2004                 alps_passthrough_mode_v2(psmouse, true);
2005
2006         poll_failed = ps2_command(&psmouse->ps2dev, buf,
2007                                   PSMOUSE_CMD_POLL | (psmouse->pktsize << 8)) < 0;
2008
2009         if (priv->flags & ALPS_PASS)
2010                 alps_passthrough_mode_v2(psmouse, false);
2011
2012         if (poll_failed || (buf[0] & priv->mask0) != priv->byte0)
2013                 return -1;
2014
2015         if ((psmouse->badbyte & 0xc8) == 0x08) {
2016 /*
2017  * Poll the track stick ...
2018  */
2019                 if (ps2_command(&psmouse->ps2dev, buf, PSMOUSE_CMD_POLL | (3 << 8)))
2020                         return -1;
2021         }
2022
2023         memcpy(psmouse->packet, buf, sizeof(buf));
2024         return 0;
2025 }
2026
2027 static int alps_hw_init_v1_v2(struct psmouse *psmouse)
2028 {
2029         struct alps_data *priv = psmouse->private;
2030
2031         if ((priv->flags & ALPS_PASS) &&
2032             alps_passthrough_mode_v2(psmouse, true)) {
2033                 return -1;
2034         }
2035
2036         if (alps_tap_mode(psmouse, true)) {
2037                 psmouse_warn(psmouse, "Failed to enable hardware tapping\n");
2038                 return -1;
2039         }
2040
2041         if (alps_absolute_mode_v1_v2(psmouse)) {
2042                 psmouse_err(psmouse, "Failed to enable absolute mode\n");
2043                 return -1;
2044         }
2045
2046         if ((priv->flags & ALPS_PASS) &&
2047             alps_passthrough_mode_v2(psmouse, false)) {
2048                 return -1;
2049         }
2050
2051         /* ALPS needs stream mode, otherwise it won't report any data */
2052         if (ps2_command(&psmouse->ps2dev, NULL, PSMOUSE_CMD_SETSTREAM)) {
2053                 psmouse_err(psmouse, "Failed to enable stream mode\n");
2054                 return -1;
2055         }
2056
2057         return 0;
2058 }
2059
2060 static int alps_hw_init_v6(struct psmouse *psmouse)
2061 {
2062         unsigned char param[2] = {0xC8, 0x14};
2063
2064         /* Enter passthrough mode to let trackpoint enter 6byte raw mode */
2065         if (alps_passthrough_mode_v2(psmouse, true))
2066                 return -1;
2067
2068         if (ps2_command(&psmouse->ps2dev, NULL, PSMOUSE_CMD_SETSCALE11) ||
2069             ps2_command(&psmouse->ps2dev, NULL, PSMOUSE_CMD_SETSCALE11) ||
2070             ps2_command(&psmouse->ps2dev, NULL, PSMOUSE_CMD_SETSCALE11) ||
2071             ps2_command(&psmouse->ps2dev, &param[0], PSMOUSE_CMD_SETRATE) ||
2072             ps2_command(&psmouse->ps2dev, &param[1], PSMOUSE_CMD_SETRATE))
2073                 return -1;
2074
2075         if (alps_passthrough_mode_v2(psmouse, false))
2076                 return -1;
2077
2078         if (alps_absolute_mode_v6(psmouse)) {
2079                 psmouse_err(psmouse, "Failed to enable absolute mode\n");
2080                 return -1;
2081         }
2082
2083         return 0;
2084 }
2085
2086 /*
2087  * Enable or disable passthrough mode to the trackstick.
2088  */
2089 static int alps_passthrough_mode_v3(struct psmouse *psmouse,
2090                                     int reg_base, bool enable)
2091 {
2092         int reg_val, ret = -1;
2093
2094         if (alps_enter_command_mode(psmouse))
2095                 return -1;
2096
2097         reg_val = alps_command_mode_read_reg(psmouse, reg_base + 0x0008);
2098         if (reg_val == -1)
2099                 goto error;
2100
2101         if (enable)
2102                 reg_val |= 0x01;
2103         else
2104                 reg_val &= ~0x01;
2105
2106         ret = __alps_command_mode_write_reg(psmouse, reg_val);
2107
2108 error:
2109         if (alps_exit_command_mode(psmouse))
2110                 ret = -1;
2111         return ret;
2112 }
2113
2114 /* Must be in command mode when calling this function */
2115 static int alps_absolute_mode_v3(struct psmouse *psmouse)
2116 {
2117         int reg_val;
2118
2119         reg_val = alps_command_mode_read_reg(psmouse, 0x0004);
2120         if (reg_val == -1)
2121                 return -1;
2122
2123         reg_val |= 0x06;
2124         if (__alps_command_mode_write_reg(psmouse, reg_val))
2125                 return -1;
2126
2127         return 0;
2128 }
2129
2130 static int alps_probe_trackstick_v3_v7(struct psmouse *psmouse, int reg_base)
2131 {
2132         int ret = -EIO, reg_val;
2133
2134         if (alps_enter_command_mode(psmouse))
2135                 goto error;
2136
2137         reg_val = alps_command_mode_read_reg(psmouse, reg_base + 0x08);
2138         if (reg_val == -1)
2139                 goto error;
2140
2141         /* bit 7: trackstick is present */
2142         ret = reg_val & 0x80 ? 0 : -ENODEV;
2143
2144 error:
2145         alps_exit_command_mode(psmouse);
2146         return ret;
2147 }
2148
2149 static int alps_setup_trackstick_v3(struct psmouse *psmouse, int reg_base)
2150 {
2151         struct ps2dev *ps2dev = &psmouse->ps2dev;
2152         int ret = 0;
2153         unsigned char param[4];
2154
2155         if (alps_passthrough_mode_v3(psmouse, reg_base, true))
2156                 return -EIO;
2157
2158         /*
2159          * E7 report for the trackstick
2160          *
2161          * There have been reports of failures to seem to trace back
2162          * to the above trackstick check failing. When these occur
2163          * this E7 report fails, so when that happens we continue
2164          * with the assumption that there isn't a trackstick after
2165          * all.
2166          */
2167         if (alps_rpt_cmd(psmouse, 0, PSMOUSE_CMD_SETSCALE21, param)) {
2168                 psmouse_warn(psmouse, "Failed to initialize trackstick (E7 report failed)\n");
2169                 ret = -ENODEV;
2170         } else {
2171                 psmouse_dbg(psmouse, "trackstick E7 report: %3ph\n", param);
2172
2173                 /*
2174                  * Not sure what this does, but it is absolutely
2175                  * essential. Without it, the touchpad does not
2176                  * work at all and the trackstick just emits normal
2177                  * PS/2 packets.
2178                  */
2179                 if (ps2_command(ps2dev, NULL, PSMOUSE_CMD_SETSCALE11) ||
2180                     ps2_command(ps2dev, NULL, PSMOUSE_CMD_SETSCALE11) ||
2181                     ps2_command(ps2dev, NULL, PSMOUSE_CMD_SETSCALE11) ||
2182                     alps_command_mode_send_nibble(psmouse, 0x9) ||
2183                     alps_command_mode_send_nibble(psmouse, 0x4)) {
2184                         psmouse_err(psmouse,
2185                                     "Error sending magic E6 sequence\n");
2186                         ret = -EIO;
2187                         goto error;
2188                 }
2189
2190                 /*
2191                  * This ensures the trackstick packets are in the format
2192                  * supported by this driver. If bit 1 isn't set the packet
2193                  * format is different.
2194                  */
2195                 if (alps_enter_command_mode(psmouse) ||
2196                     alps_command_mode_write_reg(psmouse,
2197                                                 reg_base + 0x08, 0x82) ||
2198                     alps_exit_command_mode(psmouse))
2199                         ret = -EIO;
2200         }
2201
2202 error:
2203         if (alps_passthrough_mode_v3(psmouse, reg_base, false))
2204                 ret = -EIO;
2205
2206         return ret;
2207 }
2208
2209 static int alps_hw_init_v3(struct psmouse *psmouse)
2210 {
2211         struct alps_data *priv = psmouse->private;
2212         struct ps2dev *ps2dev = &psmouse->ps2dev;
2213         int reg_val;
2214         unsigned char param[4];
2215
2216         if ((priv->flags & ALPS_DUALPOINT) &&
2217             alps_setup_trackstick_v3(psmouse, ALPS_REG_BASE_PINNACLE) == -EIO)
2218                 goto error;
2219
2220         if (alps_enter_command_mode(psmouse) ||
2221             alps_absolute_mode_v3(psmouse)) {
2222                 psmouse_err(psmouse, "Failed to enter absolute mode\n");
2223                 goto error;
2224         }
2225
2226         reg_val = alps_command_mode_read_reg(psmouse, 0x0006);
2227         if (reg_val == -1)
2228                 goto error;
2229         if (__alps_command_mode_write_reg(psmouse, reg_val | 0x01))
2230                 goto error;
2231
2232         reg_val = alps_command_mode_read_reg(psmouse, 0x0007);
2233         if (reg_val == -1)
2234                 goto error;
2235         if (__alps_command_mode_write_reg(psmouse, reg_val | 0x01))
2236                 goto error;
2237
2238         if (alps_command_mode_read_reg(psmouse, 0x0144) == -1)
2239                 goto error;
2240         if (__alps_command_mode_write_reg(psmouse, 0x04))
2241                 goto error;
2242
2243         if (alps_command_mode_read_reg(psmouse, 0x0159) == -1)
2244                 goto error;
2245         if (__alps_command_mode_write_reg(psmouse, 0x03))
2246                 goto error;
2247
2248         if (alps_command_mode_read_reg(psmouse, 0x0163) == -1)
2249                 goto error;
2250         if (alps_command_mode_write_reg(psmouse, 0x0163, 0x03))
2251                 goto error;
2252
2253         if (alps_command_mode_read_reg(psmouse, 0x0162) == -1)
2254                 goto error;
2255         if (alps_command_mode_write_reg(psmouse, 0x0162, 0x04))
2256                 goto error;
2257
2258         alps_exit_command_mode(psmouse);
2259
2260         /* Set rate and enable data reporting */
2261         param[0] = 0x64;
2262         if (ps2_command(ps2dev, param, PSMOUSE_CMD_SETRATE) ||
2263             ps2_command(ps2dev, NULL, PSMOUSE_CMD_ENABLE)) {
2264                 psmouse_err(psmouse, "Failed to enable data reporting\n");
2265                 return -1;
2266         }
2267
2268         return 0;
2269
2270 error:
2271         /*
2272          * Leaving the touchpad in command mode will essentially render
2273          * it unusable until the machine reboots, so exit it here just
2274          * to be safe
2275          */
2276         alps_exit_command_mode(psmouse);
2277         return -1;
2278 }
2279
2280 static int alps_get_v3_v7_resolution(struct psmouse *psmouse, int reg_pitch)
2281 {
2282         int reg, x_pitch, y_pitch, x_electrode, y_electrode, x_phys, y_phys;
2283         struct alps_data *priv = psmouse->private;
2284
2285         reg = alps_command_mode_read_reg(psmouse, reg_pitch);
2286         if (reg < 0)
2287                 return reg;
2288
2289         x_pitch = (char)(reg << 4) >> 4; /* sign extend lower 4 bits */
2290         x_pitch = 50 + 2 * x_pitch; /* In 0.1 mm units */
2291
2292         y_pitch = (char)reg >> 4; /* sign extend upper 4 bits */
2293         y_pitch = 36 + 2 * y_pitch; /* In 0.1 mm units */
2294
2295         reg = alps_command_mode_read_reg(psmouse, reg_pitch + 1);
2296         if (reg < 0)
2297                 return reg;
2298
2299         x_electrode = (char)(reg << 4) >> 4; /* sign extend lower 4 bits */
2300         x_electrode = 17 + x_electrode;
2301
2302         y_electrode = (char)reg >> 4; /* sign extend upper 4 bits */
2303         y_electrode = 13 + y_electrode;
2304
2305         x_phys = x_pitch * (x_electrode - 1); /* In 0.1 mm units */
2306         y_phys = y_pitch * (y_electrode - 1); /* In 0.1 mm units */
2307
2308         priv->x_res = priv->x_max * 10 / x_phys; /* units / mm */
2309         priv->y_res = priv->y_max * 10 / y_phys; /* units / mm */
2310
2311         psmouse_dbg(psmouse,
2312                     "pitch %dx%d num-electrodes %dx%d physical size %dx%d mm res %dx%d\n",
2313                     x_pitch, y_pitch, x_electrode, y_electrode,
2314                     x_phys / 10, y_phys / 10, priv->x_res, priv->y_res);
2315
2316         return 0;
2317 }
2318
2319 static int alps_hw_init_rushmore_v3(struct psmouse *psmouse)
2320 {
2321         struct alps_data *priv = psmouse->private;
2322         struct ps2dev *ps2dev = &psmouse->ps2dev;
2323         int reg_val, ret = -1;
2324
2325         if (priv->flags & ALPS_DUALPOINT) {
2326                 reg_val = alps_setup_trackstick_v3(psmouse,
2327                                                    ALPS_REG_BASE_RUSHMORE);
2328                 if (reg_val == -EIO)
2329                         goto error;
2330         }
2331
2332         if (alps_enter_command_mode(psmouse) ||
2333             alps_command_mode_read_reg(psmouse, 0xc2d9) == -1 ||
2334             alps_command_mode_write_reg(psmouse, 0xc2cb, 0x00))
2335                 goto error;
2336
2337         if (alps_get_v3_v7_resolution(psmouse, 0xc2da))
2338                 goto error;
2339
2340         reg_val = alps_command_mode_read_reg(psmouse, 0xc2c6);
2341         if (reg_val == -1)
2342                 goto error;
2343         if (__alps_command_mode_write_reg(psmouse, reg_val & 0xfd))
2344                 goto error;
2345
2346         if (alps_command_mode_write_reg(psmouse, 0xc2c9, 0x64))
2347                 goto error;
2348
2349         /* enter absolute mode */
2350         reg_val = alps_command_mode_read_reg(psmouse, 0xc2c4);
2351         if (reg_val == -1)
2352                 goto error;
2353         if (__alps_command_mode_write_reg(psmouse, reg_val | 0x02))
2354                 goto error;
2355
2356         alps_exit_command_mode(psmouse);
2357         return ps2_command(ps2dev, NULL, PSMOUSE_CMD_ENABLE);
2358
2359 error:
2360         alps_exit_command_mode(psmouse);
2361         return ret;
2362 }
2363
2364 /* Must be in command mode when calling this function */
2365 static int alps_absolute_mode_v4(struct psmouse *psmouse)
2366 {
2367         int reg_val;
2368
2369         reg_val = alps_command_mode_read_reg(psmouse, 0x0004);
2370         if (reg_val == -1)
2371                 return -1;
2372
2373         reg_val |= 0x02;
2374         if (__alps_command_mode_write_reg(psmouse, reg_val))
2375                 return -1;
2376
2377         return 0;
2378 }
2379
2380 static int alps_hw_init_v4(struct psmouse *psmouse)
2381 {
2382         struct ps2dev *ps2dev = &psmouse->ps2dev;
2383         unsigned char param[4];
2384
2385         if (alps_enter_command_mode(psmouse))
2386                 goto error;
2387
2388         if (alps_absolute_mode_v4(psmouse)) {
2389                 psmouse_err(psmouse, "Failed to enter absolute mode\n");
2390                 goto error;
2391         }
2392
2393         if (alps_command_mode_write_reg(psmouse, 0x0007, 0x8c))
2394                 goto error;
2395
2396         if (alps_command_mode_write_reg(psmouse, 0x0149, 0x03))
2397                 goto error;
2398
2399         if (alps_command_mode_write_reg(psmouse, 0x0160, 0x03))
2400                 goto error;
2401
2402         if (alps_command_mode_write_reg(psmouse, 0x017f, 0x15))
2403                 goto error;
2404
2405         if (alps_command_mode_write_reg(psmouse, 0x0151, 0x01))
2406                 goto error;
2407
2408         if (alps_command_mode_write_reg(psmouse, 0x0168, 0x03))
2409                 goto error;
2410
2411         if (alps_command_mode_write_reg(psmouse, 0x014a, 0x03))
2412                 goto error;
2413
2414         if (alps_command_mode_write_reg(psmouse, 0x0161, 0x03))
2415                 goto error;
2416
2417         alps_exit_command_mode(psmouse);
2418
2419         /*
2420          * This sequence changes the output from a 9-byte to an
2421          * 8-byte format. All the same data seems to be present,
2422          * just in a more compact format.
2423          */
2424         param[0] = 0xc8;
2425         param[1] = 0x64;
2426         param[2] = 0x50;
2427         if (ps2_command(ps2dev, &param[0], PSMOUSE_CMD_SETRATE) ||
2428             ps2_command(ps2dev, &param[1], PSMOUSE_CMD_SETRATE) ||
2429             ps2_command(ps2dev, &param[2], PSMOUSE_CMD_SETRATE) ||
2430             ps2_command(ps2dev, param, PSMOUSE_CMD_GETID))
2431                 return -1;
2432
2433         /* Set rate and enable data reporting */
2434         param[0] = 0x64;
2435         if (ps2_command(ps2dev, param, PSMOUSE_CMD_SETRATE) ||
2436             ps2_command(ps2dev, NULL, PSMOUSE_CMD_ENABLE)) {
2437                 psmouse_err(psmouse, "Failed to enable data reporting\n");
2438                 return -1;
2439         }
2440
2441         return 0;
2442
2443 error:
2444         /*
2445          * Leaving the touchpad in command mode will essentially render
2446          * it unusable until the machine reboots, so exit it here just
2447          * to be safe
2448          */
2449         alps_exit_command_mode(psmouse);
2450         return -1;
2451 }
2452
2453 static int alps_get_otp_values_ss4_v2(struct psmouse *psmouse,
2454                                       unsigned char index, unsigned char otp[])
2455 {
2456         struct ps2dev *ps2dev = &psmouse->ps2dev;
2457
2458         switch (index) {
2459         case 0:
2460                 if (ps2_command(ps2dev, NULL, PSMOUSE_CMD_SETSTREAM)  ||
2461                     ps2_command(ps2dev, NULL, PSMOUSE_CMD_SETSTREAM)  ||
2462                     ps2_command(ps2dev, otp, PSMOUSE_CMD_GETINFO))
2463                         return -1;
2464
2465                 break;
2466
2467         case 1:
2468                 if (ps2_command(ps2dev, NULL, PSMOUSE_CMD_SETPOLL)  ||
2469                     ps2_command(ps2dev, NULL, PSMOUSE_CMD_SETPOLL)  ||
2470                     ps2_command(ps2dev, otp, PSMOUSE_CMD_GETINFO))
2471                         return -1;
2472
2473                 break;
2474         }
2475
2476         return 0;
2477 }
2478
2479 static int alps_update_device_area_ss4_v2(unsigned char otp[][4],
2480                                           struct alps_data *priv)
2481 {
2482         int num_x_electrode;
2483         int num_y_electrode;
2484         int x_pitch, y_pitch, x_phys, y_phys;
2485
2486         if (IS_SS4PLUS_DEV(priv->dev_id)) {
2487                 num_x_electrode =
2488                         SS4PLUS_NUMSENSOR_XOFFSET + (otp[0][2] & 0x0F);
2489                 num_y_electrode =
2490                         SS4PLUS_NUMSENSOR_YOFFSET + ((otp[0][2] >> 4) & 0x0F);
2491
2492                 priv->x_max =
2493                         (num_x_electrode - 1) * SS4PLUS_COUNT_PER_ELECTRODE;
2494                 priv->y_max =
2495                         (num_y_electrode - 1) * SS4PLUS_COUNT_PER_ELECTRODE;
2496
2497                 x_pitch = (otp[0][1] & 0x0F) + SS4PLUS_MIN_PITCH_MM;
2498                 y_pitch = ((otp[0][1] >> 4) & 0x0F) + SS4PLUS_MIN_PITCH_MM;
2499
2500         } else {
2501                 num_x_electrode =
2502                         SS4_NUMSENSOR_XOFFSET + (otp[1][0] & 0x0F);
2503                 num_y_electrode =
2504                         SS4_NUMSENSOR_YOFFSET + ((otp[1][0] >> 4) & 0x0F);
2505
2506                 priv->x_max =
2507                         (num_x_electrode - 1) * SS4_COUNT_PER_ELECTRODE;
2508                 priv->y_max =
2509                         (num_y_electrode - 1) * SS4_COUNT_PER_ELECTRODE;
2510
2511                 x_pitch = ((otp[1][2] >> 2) & 0x07) + SS4_MIN_PITCH_MM;
2512                 y_pitch = ((otp[1][2] >> 5) & 0x07) + SS4_MIN_PITCH_MM;
2513         }
2514
2515         x_phys = x_pitch * (num_x_electrode - 1); /* In 0.1 mm units */
2516         y_phys = y_pitch * (num_y_electrode - 1); /* In 0.1 mm units */
2517
2518         priv->x_res = priv->x_max * 10 / x_phys; /* units / mm */
2519         priv->y_res = priv->y_max * 10 / y_phys; /* units / mm */
2520
2521         return 0;
2522 }
2523
2524 static int alps_update_btn_info_ss4_v2(unsigned char otp[][4],
2525                                        struct alps_data *priv)
2526 {
2527         unsigned char is_btnless;
2528
2529         if (IS_SS4PLUS_DEV(priv->dev_id))
2530                 is_btnless = (otp[1][0] >> 1) & 0x01;
2531         else
2532                 is_btnless = (otp[1][1] >> 3) & 0x01;
2533
2534         if (is_btnless)
2535                 priv->flags |= ALPS_BUTTONPAD;
2536
2537         return 0;
2538 }
2539
2540 static int alps_update_dual_info_ss4_v2(unsigned char otp[][4],
2541                                         struct alps_data *priv,
2542                                         struct psmouse *psmouse)
2543 {
2544         bool is_dual = false;
2545         int reg_val = 0;
2546         struct ps2dev *ps2dev = &psmouse->ps2dev;
2547
2548         if (IS_SS4PLUS_DEV(priv->dev_id)) {
2549                 is_dual = (otp[0][0] >> 4) & 0x01;
2550
2551                 if (!is_dual) {
2552                         /* For support TrackStick of Thinkpad L/E series */
2553                         if (alps_exit_command_mode(psmouse) == 0 &&
2554                                 alps_enter_command_mode(psmouse) == 0) {
2555                                 reg_val = alps_command_mode_read_reg(psmouse,
2556                                                                         0xD7);
2557                         }
2558                         alps_exit_command_mode(psmouse);
2559                         ps2_command(ps2dev, NULL, PSMOUSE_CMD_ENABLE);
2560
2561                         if (reg_val == 0x0C || reg_val == 0x1D)
2562                                 is_dual = true;
2563                 }
2564         }
2565
2566         if (is_dual)
2567                 priv->flags |= ALPS_DUALPOINT |
2568                                         ALPS_DUALPOINT_WITH_PRESSURE;
2569
2570         return 0;
2571 }
2572
2573 static int alps_set_defaults_ss4_v2(struct psmouse *psmouse,
2574                                     struct alps_data *priv)
2575 {
2576         unsigned char otp[2][4];
2577
2578         memset(otp, 0, sizeof(otp));
2579
2580         if (alps_get_otp_values_ss4_v2(psmouse, 1, &otp[1][0]) ||
2581             alps_get_otp_values_ss4_v2(psmouse, 0, &otp[0][0]))
2582                 return -1;
2583
2584         alps_update_device_area_ss4_v2(otp, priv);
2585
2586         alps_update_btn_info_ss4_v2(otp, priv);
2587
2588         alps_update_dual_info_ss4_v2(otp, priv, psmouse);
2589
2590         return 0;
2591 }
2592
2593 static int alps_dolphin_get_device_area(struct psmouse *psmouse,
2594                                         struct alps_data *priv)
2595 {
2596         struct ps2dev *ps2dev = &psmouse->ps2dev;
2597         unsigned char param[4] = {0};
2598         int num_x_electrode, num_y_electrode;
2599
2600         if (alps_enter_command_mode(psmouse))
2601                 return -1;
2602
2603         param[0] = 0x0a;
2604         if (ps2_command(ps2dev, NULL, PSMOUSE_CMD_RESET_WRAP) ||
2605             ps2_command(ps2dev, NULL, PSMOUSE_CMD_SETPOLL) ||
2606             ps2_command(ps2dev, NULL, PSMOUSE_CMD_SETPOLL) ||
2607             ps2_command(ps2dev, &param[0], PSMOUSE_CMD_SETRATE) ||
2608             ps2_command(ps2dev, &param[0], PSMOUSE_CMD_SETRATE))
2609                 return -1;
2610
2611         if (ps2_command(ps2dev, param, PSMOUSE_CMD_GETINFO))
2612                 return -1;
2613
2614         /*
2615          * Dolphin's sensor line number is not fixed. It can be calculated
2616          * by adding the device's register value with DOLPHIN_PROFILE_X/YOFFSET.
2617          * Further more, we can get device's x_max and y_max by multiplying
2618          * sensor line number with DOLPHIN_COUNT_PER_ELECTRODE.
2619          *
2620          * e.g. When we get register's sensor_x = 11 & sensor_y = 8,
2621          *      real sensor line number X = 11 + 8 = 19, and
2622          *      real sensor line number Y = 8 + 1 = 9.
2623          *      So, x_max = (19 - 1) * 64 = 1152, and
2624          *          y_max = (9 - 1) * 64 = 512.
2625          */
2626         num_x_electrode = DOLPHIN_PROFILE_XOFFSET + (param[2] & 0x0F);
2627         num_y_electrode = DOLPHIN_PROFILE_YOFFSET + ((param[2] >> 4) & 0x0F);
2628         priv->x_bits = num_x_electrode;
2629         priv->y_bits = num_y_electrode;
2630         priv->x_max = (num_x_electrode - 1) * DOLPHIN_COUNT_PER_ELECTRODE;
2631         priv->y_max = (num_y_electrode - 1) * DOLPHIN_COUNT_PER_ELECTRODE;
2632
2633         if (alps_exit_command_mode(psmouse))
2634                 return -1;
2635
2636         return 0;
2637 }
2638
2639 static int alps_hw_init_dolphin_v1(struct psmouse *psmouse)
2640 {
2641         struct ps2dev *ps2dev = &psmouse->ps2dev;
2642         unsigned char param[2];
2643
2644         /* This is dolphin "v1" as empirically defined by florin9doi */
2645         param[0] = 0x64;
2646         param[1] = 0x28;
2647
2648         if (ps2_command(ps2dev, NULL, PSMOUSE_CMD_SETSTREAM) ||
2649             ps2_command(ps2dev, &param[0], PSMOUSE_CMD_SETRATE) ||
2650             ps2_command(ps2dev, &param[1], PSMOUSE_CMD_SETRATE))
2651                 return -1;
2652
2653         return 0;
2654 }
2655
2656 static int alps_hw_init_v7(struct psmouse *psmouse)
2657 {
2658         struct ps2dev *ps2dev = &psmouse->ps2dev;
2659         int reg_val, ret = -1;
2660
2661         if (alps_enter_command_mode(psmouse) ||
2662             alps_command_mode_read_reg(psmouse, 0xc2d9) == -1)
2663                 goto error;
2664
2665         if (alps_get_v3_v7_resolution(psmouse, 0xc397))
2666                 goto error;
2667
2668         if (alps_command_mode_write_reg(psmouse, 0xc2c9, 0x64))
2669                 goto error;
2670
2671         reg_val = alps_command_mode_read_reg(psmouse, 0xc2c4);
2672         if (reg_val == -1)
2673                 goto error;
2674         if (__alps_command_mode_write_reg(psmouse, reg_val | 0x02))
2675                 goto error;
2676
2677         alps_exit_command_mode(psmouse);
2678         return ps2_command(ps2dev, NULL, PSMOUSE_CMD_ENABLE);
2679
2680 error:
2681         alps_exit_command_mode(psmouse);
2682         return ret;
2683 }
2684
2685 static int alps_hw_init_ss4_v2(struct psmouse *psmouse)
2686 {
2687         struct ps2dev *ps2dev = &psmouse->ps2dev;
2688         char param[2] = {0x64, 0x28};
2689         int ret = -1;
2690
2691         /* enter absolute mode */
2692         if (ps2_command(ps2dev, NULL, PSMOUSE_CMD_SETSTREAM) ||
2693             ps2_command(ps2dev, NULL, PSMOUSE_CMD_SETSTREAM) ||
2694             ps2_command(ps2dev, &param[0], PSMOUSE_CMD_SETRATE) ||
2695             ps2_command(ps2dev, &param[1], PSMOUSE_CMD_SETRATE)) {
2696                 goto error;
2697         }
2698
2699         /* T.B.D. Decread noise packet number, delete in the future */
2700         if (alps_exit_command_mode(psmouse) ||
2701             alps_enter_command_mode(psmouse) ||
2702             alps_command_mode_write_reg(psmouse, 0x001D, 0x20)) {
2703                 goto error;
2704         }
2705         alps_exit_command_mode(psmouse);
2706
2707         return ps2_command(ps2dev, NULL, PSMOUSE_CMD_ENABLE);
2708
2709 error:
2710         alps_exit_command_mode(psmouse);
2711         return ret;
2712 }
2713
2714 static int alps_set_protocol(struct psmouse *psmouse,
2715                              struct alps_data *priv,
2716                              const struct alps_protocol_info *protocol)
2717 {
2718         psmouse->private = priv;
2719
2720         setup_timer(&priv->timer, alps_flush_packet, (unsigned long)psmouse);
2721
2722         priv->proto_version = protocol->version;
2723         priv->byte0 = protocol->byte0;
2724         priv->mask0 = protocol->mask0;
2725         priv->flags = protocol->flags;
2726
2727         priv->x_max = 2000;
2728         priv->y_max = 1400;
2729         priv->x_bits = 15;
2730         priv->y_bits = 11;
2731
2732         switch (priv->proto_version) {
2733         case ALPS_PROTO_V1:
2734         case ALPS_PROTO_V2:
2735                 priv->hw_init = alps_hw_init_v1_v2;
2736                 priv->process_packet = alps_process_packet_v1_v2;
2737                 priv->set_abs_params = alps_set_abs_params_st;
2738                 priv->x_max = 1023;
2739                 priv->y_max = 767;
2740                 if (dmi_check_system(alps_dmi_has_separate_stick_buttons))
2741                         priv->flags |= ALPS_STICK_BITS;
2742                 break;
2743
2744         case ALPS_PROTO_V3:
2745                 priv->hw_init = alps_hw_init_v3;
2746                 priv->process_packet = alps_process_packet_v3;
2747                 priv->set_abs_params = alps_set_abs_params_semi_mt;
2748                 priv->decode_fields = alps_decode_pinnacle;
2749                 priv->nibble_commands = alps_v3_nibble_commands;
2750                 priv->addr_command = PSMOUSE_CMD_RESET_WRAP;
2751
2752                 if (alps_probe_trackstick_v3_v7(psmouse,
2753                                                 ALPS_REG_BASE_PINNACLE) < 0)
2754                         priv->flags &= ~ALPS_DUALPOINT;
2755
2756                 break;
2757
2758         case ALPS_PROTO_V3_RUSHMORE:
2759                 priv->hw_init = alps_hw_init_rushmore_v3;
2760                 priv->process_packet = alps_process_packet_v3;
2761                 priv->set_abs_params = alps_set_abs_params_semi_mt;
2762                 priv->decode_fields = alps_decode_rushmore;
2763                 priv->nibble_commands = alps_v3_nibble_commands;
2764                 priv->addr_command = PSMOUSE_CMD_RESET_WRAP;
2765                 priv->x_bits = 16;
2766                 priv->y_bits = 12;
2767
2768                 if (alps_probe_trackstick_v3_v7(psmouse,
2769                                                 ALPS_REG_BASE_RUSHMORE) < 0)
2770                         priv->flags &= ~ALPS_DUALPOINT;
2771
2772                 break;
2773
2774         case ALPS_PROTO_V4:
2775                 priv->hw_init = alps_hw_init_v4;
2776                 priv->process_packet = alps_process_packet_v4;
2777                 priv->set_abs_params = alps_set_abs_params_semi_mt;
2778                 priv->nibble_commands = alps_v4_nibble_commands;
2779                 priv->addr_command = PSMOUSE_CMD_DISABLE;
2780                 break;
2781
2782         case ALPS_PROTO_V5:
2783                 priv->hw_init = alps_hw_init_dolphin_v1;
2784                 priv->process_packet = alps_process_touchpad_packet_v3_v5;
2785                 priv->decode_fields = alps_decode_dolphin;
2786                 priv->set_abs_params = alps_set_abs_params_semi_mt;
2787                 priv->nibble_commands = alps_v3_nibble_commands;
2788                 priv->addr_command = PSMOUSE_CMD_RESET_WRAP;
2789                 priv->x_bits = 23;
2790                 priv->y_bits = 12;
2791
2792                 if (alps_dolphin_get_device_area(psmouse, priv))
2793                         return -EIO;
2794
2795                 break;
2796
2797         case ALPS_PROTO_V6:
2798                 priv->hw_init = alps_hw_init_v6;
2799                 priv->process_packet = alps_process_packet_v6;
2800                 priv->set_abs_params = alps_set_abs_params_st;
2801                 priv->nibble_commands = alps_v6_nibble_commands;
2802                 priv->x_max = 2047;
2803                 priv->y_max = 1535;
2804                 break;
2805
2806         case ALPS_PROTO_V7:
2807                 priv->hw_init = alps_hw_init_v7;
2808                 priv->process_packet = alps_process_packet_v7;
2809                 priv->decode_fields = alps_decode_packet_v7;
2810                 priv->set_abs_params = alps_set_abs_params_v7;
2811                 priv->nibble_commands = alps_v3_nibble_commands;
2812                 priv->addr_command = PSMOUSE_CMD_RESET_WRAP;
2813                 priv->x_max = 0xfff;
2814                 priv->y_max = 0x7ff;
2815
2816                 if (priv->fw_ver[1] != 0xba)
2817                         priv->flags |= ALPS_BUTTONPAD;
2818
2819                 if (alps_probe_trackstick_v3_v7(psmouse, ALPS_REG_BASE_V7) < 0)
2820                         priv->flags &= ~ALPS_DUALPOINT;
2821
2822                 break;
2823
2824         case ALPS_PROTO_V8:
2825                 priv->hw_init = alps_hw_init_ss4_v2;
2826                 priv->process_packet = alps_process_packet_ss4_v2;
2827                 priv->decode_fields = alps_decode_ss4_v2;
2828                 priv->set_abs_params = alps_set_abs_params_ss4_v2;
2829                 priv->nibble_commands = alps_v3_nibble_commands;
2830                 priv->addr_command = PSMOUSE_CMD_RESET_WRAP;
2831
2832                 if (alps_set_defaults_ss4_v2(psmouse, priv))
2833                         return -EIO;
2834
2835                 break;
2836         }
2837
2838         return 0;
2839 }
2840
2841 static const struct alps_protocol_info *alps_match_table(unsigned char *e7,
2842                                                          unsigned char *ec)
2843 {
2844         const struct alps_model_info *model;
2845         int i;
2846
2847         for (i = 0; i < ARRAY_SIZE(alps_model_data); i++) {
2848                 model = &alps_model_data[i];
2849
2850                 if (!memcmp(e7, model->signature, sizeof(model->signature)) &&
2851                     (!model->command_mode_resp ||
2852                      model->command_mode_resp == ec[2])) {
2853
2854                         return &model->protocol_info;
2855                 }
2856         }
2857
2858         return NULL;
2859 }
2860
2861 static int alps_identify(struct psmouse *psmouse, struct alps_data *priv)
2862 {
2863         const struct alps_protocol_info *protocol;
2864         unsigned char e6[4], e7[4], ec[4];
2865         int error;
2866
2867         /*
2868          * First try "E6 report".
2869          * ALPS should return 0,0,10 or 0,0,100 if no buttons are pressed.
2870          * The bits 0-2 of the first byte will be 1s if some buttons are
2871          * pressed.
2872          */
2873         if (alps_rpt_cmd(psmouse, PSMOUSE_CMD_SETRES,
2874                          PSMOUSE_CMD_SETSCALE11, e6))
2875                 return -EIO;
2876
2877         if ((e6[0] & 0xf8) != 0 || e6[1] != 0 || (e6[2] != 10 && e6[2] != 100))
2878                 return -EINVAL;
2879
2880         /*
2881          * Now get the "E7" and "EC" reports.  These will uniquely identify
2882          * most ALPS touchpads.
2883          */
2884         if (alps_rpt_cmd(psmouse, PSMOUSE_CMD_SETRES,
2885                          PSMOUSE_CMD_SETSCALE21, e7) ||
2886             alps_rpt_cmd(psmouse, PSMOUSE_CMD_SETRES,
2887                          PSMOUSE_CMD_RESET_WRAP, ec) ||
2888             alps_exit_command_mode(psmouse))
2889                 return -EIO;
2890
2891         protocol = alps_match_table(e7, ec);
2892         if (!protocol) {
2893                 if (e7[0] == 0x73 && e7[1] == 0x03 && e7[2] == 0x50 &&
2894                            ec[0] == 0x73 && (ec[1] == 0x01 || ec[1] == 0x02)) {
2895                         protocol = &alps_v5_protocol_data;
2896                 } else if (ec[0] == 0x88 &&
2897                            ((ec[1] & 0xf0) == 0xb0 || (ec[1] & 0xf0) == 0xc0)) {
2898                         protocol = &alps_v7_protocol_data;
2899                 } else if (ec[0] == 0x88 && ec[1] == 0x08) {
2900                         protocol = &alps_v3_rushmore_data;
2901                 } else if (ec[0] == 0x88 && ec[1] == 0x07 &&
2902                            ec[2] >= 0x90 && ec[2] <= 0x9d) {
2903                         protocol = &alps_v3_protocol_data;
2904                 } else if (e7[0] == 0x73 && e7[1] == 0x03 &&
2905                            (e7[2] == 0x14 || e7[2] == 0x28)) {
2906                         protocol = &alps_v8_protocol_data;
2907                 } else {
2908                         psmouse_dbg(psmouse,
2909                                     "Likely not an ALPS touchpad: E7=%3ph, EC=%3ph\n", e7, ec);
2910                         return -EINVAL;
2911                 }
2912         }
2913
2914         if (priv) {
2915                 /* Save Device ID and Firmware version */
2916                 memcpy(priv->dev_id, e7, 3);
2917                 memcpy(priv->fw_ver, ec, 3);
2918                 error = alps_set_protocol(psmouse, priv, protocol);
2919                 if (error)
2920                         return error;
2921         }
2922
2923         return 0;
2924 }
2925
2926 static int alps_reconnect(struct psmouse *psmouse)
2927 {
2928         struct alps_data *priv = psmouse->private;
2929
2930         psmouse_reset(psmouse);
2931
2932         if (alps_identify(psmouse, priv) < 0)
2933                 return -1;
2934
2935         return priv->hw_init(psmouse);
2936 }
2937
2938 static void alps_disconnect(struct psmouse *psmouse)
2939 {
2940         struct alps_data *priv = psmouse->private;
2941
2942         psmouse_reset(psmouse);
2943         del_timer_sync(&priv->timer);
2944         if (priv->dev2)
2945                 input_unregister_device(priv->dev2);
2946         if (!IS_ERR_OR_NULL(priv->dev3))
2947                 input_unregister_device(priv->dev3);
2948         kfree(priv);
2949 }
2950
2951 static void alps_set_abs_params_st(struct alps_data *priv,
2952                                    struct input_dev *dev1)
2953 {
2954         input_set_abs_params(dev1, ABS_X, 0, priv->x_max, 0, 0);
2955         input_set_abs_params(dev1, ABS_Y, 0, priv->y_max, 0, 0);
2956         input_set_abs_params(dev1, ABS_PRESSURE, 0, 127, 0, 0);
2957 }
2958
2959 static void alps_set_abs_params_mt_common(struct alps_data *priv,
2960                                           struct input_dev *dev1)
2961 {
2962         input_set_abs_params(dev1, ABS_MT_POSITION_X, 0, priv->x_max, 0, 0);
2963         input_set_abs_params(dev1, ABS_MT_POSITION_Y, 0, priv->y_max, 0, 0);
2964
2965         input_abs_set_res(dev1, ABS_MT_POSITION_X, priv->x_res);
2966         input_abs_set_res(dev1, ABS_MT_POSITION_Y, priv->y_res);
2967
2968         set_bit(BTN_TOOL_TRIPLETAP, dev1->keybit);
2969         set_bit(BTN_TOOL_QUADTAP, dev1->keybit);
2970 }
2971
2972 static void alps_set_abs_params_semi_mt(struct alps_data *priv,
2973                                         struct input_dev *dev1)
2974 {
2975         alps_set_abs_params_mt_common(priv, dev1);
2976         input_set_abs_params(dev1, ABS_PRESSURE, 0, 127, 0, 0);
2977
2978         input_mt_init_slots(dev1, MAX_TOUCHES,
2979                             INPUT_MT_POINTER | INPUT_MT_DROP_UNUSED |
2980                                 INPUT_MT_SEMI_MT);
2981 }
2982
2983 static void alps_set_abs_params_v7(struct alps_data *priv,
2984                                    struct input_dev *dev1)
2985 {
2986         alps_set_abs_params_mt_common(priv, dev1);
2987         set_bit(BTN_TOOL_QUINTTAP, dev1->keybit);
2988
2989         input_mt_init_slots(dev1, MAX_TOUCHES,
2990                             INPUT_MT_POINTER | INPUT_MT_DROP_UNUSED |
2991                                 INPUT_MT_TRACK);
2992
2993         set_bit(BTN_TOOL_QUINTTAP, dev1->keybit);
2994 }
2995
2996 static void alps_set_abs_params_ss4_v2(struct alps_data *priv,
2997                                        struct input_dev *dev1)
2998 {
2999         alps_set_abs_params_mt_common(priv, dev1);
3000         input_set_abs_params(dev1, ABS_PRESSURE, 0, 127, 0, 0);
3001         set_bit(BTN_TOOL_QUINTTAP, dev1->keybit);
3002
3003         input_mt_init_slots(dev1, MAX_TOUCHES,
3004                             INPUT_MT_POINTER | INPUT_MT_DROP_UNUSED |
3005                                 INPUT_MT_TRACK);
3006 }
3007
3008 int alps_init(struct psmouse *psmouse)
3009 {
3010         struct alps_data *priv = psmouse->private;
3011         struct input_dev *dev1 = psmouse->dev;
3012         int error;
3013
3014         error = priv->hw_init(psmouse);
3015         if (error)
3016                 goto init_fail;
3017
3018         /*
3019          * Undo part of setup done for us by psmouse core since touchpad
3020          * is not a relative device.
3021          */
3022         __clear_bit(EV_REL, dev1->evbit);
3023         __clear_bit(REL_X, dev1->relbit);
3024         __clear_bit(REL_Y, dev1->relbit);
3025
3026         /*
3027          * Now set up our capabilities.
3028          */
3029         dev1->evbit[BIT_WORD(EV_KEY)] |= BIT_MASK(EV_KEY);
3030         dev1->keybit[BIT_WORD(BTN_TOUCH)] |= BIT_MASK(BTN_TOUCH);
3031         dev1->keybit[BIT_WORD(BTN_TOOL_FINGER)] |= BIT_MASK(BTN_TOOL_FINGER);
3032         dev1->keybit[BIT_WORD(BTN_LEFT)] |=
3033                 BIT_MASK(BTN_LEFT) | BIT_MASK(BTN_RIGHT);
3034
3035         dev1->evbit[BIT_WORD(EV_ABS)] |= BIT_MASK(EV_ABS);
3036
3037         priv->set_abs_params(priv, dev1);
3038
3039         if (priv->flags & ALPS_WHEEL) {
3040                 dev1->evbit[BIT_WORD(EV_REL)] |= BIT_MASK(EV_REL);
3041                 dev1->relbit[BIT_WORD(REL_WHEEL)] |= BIT_MASK(REL_WHEEL);
3042         }
3043
3044         if (priv->flags & (ALPS_FW_BK_1 | ALPS_FW_BK_2)) {
3045                 dev1->keybit[BIT_WORD(BTN_FORWARD)] |= BIT_MASK(BTN_FORWARD);
3046                 dev1->keybit[BIT_WORD(BTN_BACK)] |= BIT_MASK(BTN_BACK);
3047         }
3048
3049         if (priv->flags & ALPS_FOUR_BUTTONS) {
3050                 dev1->keybit[BIT_WORD(BTN_0)] |= BIT_MASK(BTN_0);
3051                 dev1->keybit[BIT_WORD(BTN_1)] |= BIT_MASK(BTN_1);
3052                 dev1->keybit[BIT_WORD(BTN_2)] |= BIT_MASK(BTN_2);
3053                 dev1->keybit[BIT_WORD(BTN_3)] |= BIT_MASK(BTN_3);
3054         } else if (priv->flags & ALPS_BUTTONPAD) {
3055                 set_bit(INPUT_PROP_BUTTONPAD, dev1->propbit);
3056                 clear_bit(BTN_RIGHT, dev1->keybit);
3057         } else {
3058                 dev1->keybit[BIT_WORD(BTN_MIDDLE)] |= BIT_MASK(BTN_MIDDLE);
3059         }
3060
3061         if (priv->flags & ALPS_DUALPOINT) {
3062                 struct input_dev *dev2;
3063
3064                 dev2 = input_allocate_device();
3065                 if (!dev2) {
3066                         psmouse_err(psmouse,
3067                                     "failed to allocate trackstick device\n");
3068                         error = -ENOMEM;
3069                         goto init_fail;
3070                 }
3071
3072                 snprintf(priv->phys2, sizeof(priv->phys2), "%s/input1",
3073                          psmouse->ps2dev.serio->phys);
3074                 dev2->phys = priv->phys2;
3075
3076                 /*
3077                  * format of input device name is: "protocol vendor name"
3078                  * see function psmouse_switch_protocol() in psmouse-base.c
3079                  */
3080                 dev2->name = "AlpsPS/2 ALPS DualPoint Stick";
3081
3082                 dev2->id.bustype = BUS_I8042;
3083                 dev2->id.vendor  = 0x0002;
3084                 dev2->id.product = PSMOUSE_ALPS;
3085                 dev2->id.version = priv->proto_version;
3086                 dev2->dev.parent = &psmouse->ps2dev.serio->dev;
3087
3088                 input_set_capability(dev2, EV_REL, REL_X);
3089                 input_set_capability(dev2, EV_REL, REL_Y);
3090                 if (priv->flags & ALPS_DUALPOINT_WITH_PRESSURE) {
3091                         input_set_capability(dev2, EV_ABS, ABS_PRESSURE);
3092                         input_set_abs_params(dev2, ABS_PRESSURE, 0, 127, 0, 0);
3093                 }
3094                 input_set_capability(dev2, EV_KEY, BTN_LEFT);
3095                 input_set_capability(dev2, EV_KEY, BTN_RIGHT);
3096                 input_set_capability(dev2, EV_KEY, BTN_MIDDLE);
3097
3098                 __set_bit(INPUT_PROP_POINTER, dev2->propbit);
3099                 __set_bit(INPUT_PROP_POINTING_STICK, dev2->propbit);
3100
3101                 error = input_register_device(dev2);
3102                 if (error) {
3103                         psmouse_err(psmouse,
3104                                     "failed to register trackstick device: %d\n",
3105                                     error);
3106                         input_free_device(dev2);
3107                         goto init_fail;
3108                 }
3109
3110                 priv->dev2 = dev2;
3111         }
3112
3113         priv->psmouse = psmouse;
3114
3115         INIT_DELAYED_WORK(&priv->dev3_register_work,
3116                           alps_register_bare_ps2_mouse);
3117
3118         psmouse->protocol_handler = alps_process_byte;
3119         psmouse->poll = alps_poll;
3120         psmouse->disconnect = alps_disconnect;
3121         psmouse->reconnect = alps_reconnect;
3122         psmouse->pktsize = priv->proto_version == ALPS_PROTO_V4 ? 8 : 6;
3123
3124         /* We are having trouble resyncing ALPS touchpads so disable it for now */
3125         psmouse->resync_time = 0;
3126
3127         /* Allow 2 invalid packets without resetting device */
3128         psmouse->resetafter = psmouse->pktsize * 2;
3129
3130         return 0;
3131
3132 init_fail:
3133         psmouse_reset(psmouse);
3134         /*
3135          * Even though we did not allocate psmouse->private we do free
3136          * it here.
3137          */
3138         kfree(psmouse->private);
3139         psmouse->private = NULL;
3140         return error;
3141 }
3142
3143 int alps_detect(struct psmouse *psmouse, bool set_properties)
3144 {
3145         struct alps_data *priv;
3146         int error;
3147
3148         error = alps_identify(psmouse, NULL);
3149         if (error)
3150                 return error;
3151
3152         /*
3153          * Reset the device to make sure it is fully operational:
3154          * on some laptops, like certain Dell Latitudes, we may
3155          * fail to properly detect presence of trackstick if device
3156          * has not been reset.
3157          */
3158         psmouse_reset(psmouse);
3159
3160         priv = kzalloc(sizeof(struct alps_data), GFP_KERNEL);
3161         if (!priv)
3162                 return -ENOMEM;
3163
3164         error = alps_identify(psmouse, priv);
3165         if (error) {
3166                 kfree(priv);
3167                 return error;
3168         }
3169
3170         if (set_properties) {
3171                 psmouse->vendor = "ALPS";
3172                 psmouse->name = priv->flags & ALPS_DUALPOINT ?
3173                                 "DualPoint TouchPad" : "GlidePoint";
3174                 psmouse->model = priv->proto_version;
3175         } else {
3176                 /*
3177                  * Destroy alps_data structure we allocated earlier since
3178                  * this was just a "trial run". Otherwise we'll keep it
3179                  * to be used by alps_init() which has to be called if
3180                  * we succeed and set_properties is true.
3181                  */
3182                 kfree(priv);
3183                 psmouse->private = NULL;
3184         }
3185
3186         return 0;
3187 }
3188