drivers/input/mouse/cypress_ps2.c

   1 /*
   2  * Cypress Trackpad PS/2 mouse driver
   3  *
   4  * Copyright (c) 2012 Cypress Semiconductor Corporation.
   5  *
   6  * Author:
   7  *   Dudley Du <dudl@cypress.com>
   8  *
   9  * Additional contributors include:
  10  *   Kamal Mostafa <kamal@canonical.com>
  11  *   Kyle Fazzari <git@status.e4ward.com>
  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/init.h>
  19 #include <linux/module.h>
  20 #include <linux/kernel.h>
  21 #include <linux/slab.h>
  22 #include <linux/serio.h>
  23 #include <linux/libps2.h>
  24 #include <linux/input.h>
  25 #include <linux/input/mt.h>
  26 #include <linux/sched.h>
  27 #include <linux/wait.h>
  28
  29 #include "cypress_ps2.h"
  30
  31 #undef CYTP_DEBUG_VERBOSE  /* define this and DEBUG for more verbose dump */
  32
  33 static void cypress_set_packet_size(struct psmouse *psmouse, unsigned int n)
  34 {
  35         struct cytp_data *cytp = psmouse->private;
  36         cytp->pkt_size = n;
  37 }
  38
  39 static const unsigned char cytp_rate[] = {10, 20, 40, 60, 100, 200};
  40 static const unsigned char cytp_resolution[] = {0x00, 0x01, 0x02, 0x03};
  41
  42 static int cypress_ps2_sendbyte(struct psmouse *psmouse, int value)
  43 {
  44         struct ps2dev *ps2dev = &psmouse->ps2dev;
  45
  46         if (ps2_sendbyte(ps2dev, value & 0xff, CYTP_CMD_TIMEOUT) < 0) {
  47                 psmouse_dbg(psmouse,
  48                                 "sending command 0x%02x failed, resp 0x%02x\n",
  49                                 value & 0xff, ps2dev->nak);
  50                 if (ps2dev->nak == CYTP_PS2_RETRY)
  51                         return CYTP_PS2_RETRY;
  52                 else
  53                         return CYTP_PS2_ERROR;
  54         }
  55
  56 #ifdef CYTP_DEBUG_VERBOSE
  57         psmouse_dbg(psmouse, "sending command 0x%02x succeeded, resp 0xfa\n",
  58                         value & 0xff);
  59 #endif
  60
  61         return 0;
  62 }
  63
  64 static int cypress_ps2_ext_cmd(struct psmouse *psmouse, unsigned short cmd,
  65                                unsigned char data)
  66 {
  67         struct ps2dev *ps2dev = &psmouse->ps2dev;
  68         int tries = CYTP_PS2_CMD_TRIES;
  69         int rc;
  70
  71         ps2_begin_command(ps2dev);
  72
  73         do {
  74                 /*
  75                  * Send extension command byte (0xE8 or 0xF3).
  76                  * If sending the command fails, send recovery command
  77                  * to make the device return to the ready state.
  78                  */
  79                 rc = cypress_ps2_sendbyte(psmouse, cmd & 0xff);
  80                 if (rc == CYTP_PS2_RETRY) {
  81                         rc = cypress_ps2_sendbyte(psmouse, 0x00);
  82                         if (rc == CYTP_PS2_RETRY)
  83                                 rc = cypress_ps2_sendbyte(psmouse, 0x0a);
  84                 }
  85                 if (rc == CYTP_PS2_ERROR)
  86                         continue;
  87
  88                 rc = cypress_ps2_sendbyte(psmouse, data);
  89                 if (rc == CYTP_PS2_RETRY)
  90                         rc = cypress_ps2_sendbyte(psmouse, data);
  91                 if (rc == CYTP_PS2_ERROR)
  92                         continue;
  93                 else
  94                         break;
  95         } while (--tries > 0);
  96
  97         ps2_end_command(ps2dev);
  98
  99         return rc;
 100 }
 101
 102 static int cypress_ps2_read_cmd_status(struct psmouse *psmouse,
 103                                        unsigned char cmd,
 104                                        unsigned char *param)
 105 {
 106         int rc;
 107         struct ps2dev *ps2dev = &psmouse->ps2dev;
 108         enum psmouse_state old_state;
 109         int pktsize;
 110
 111         ps2_begin_command(&psmouse->ps2dev);
 112
 113         old_state = psmouse->state;
 114         psmouse->state = PSMOUSE_CMD_MODE;
 115         psmouse->pktcnt = 0;
 116
 117         pktsize = (cmd == CYTP_CMD_READ_TP_METRICS) ? 8 : 3;
 118         memset(param, 0, pktsize);
 119
 120         rc = cypress_ps2_sendbyte(psmouse, 0xe9);
 121         if (rc < 0)
 122                 goto out;
 123
 124         wait_event_timeout(ps2dev->wait,
 125                         (psmouse->pktcnt >= pktsize),
 126                         msecs_to_jiffies(CYTP_CMD_TIMEOUT));
 127
 128         memcpy(param, psmouse->packet, pktsize);
 129
 130         psmouse_dbg(psmouse, "Command 0x%02x response data (0x): %*ph\n",
 131                         cmd, pktsize, param);
 132
 133 out:
 134         psmouse->state = old_state;
 135         psmouse->pktcnt = 0;
 136
 137         ps2_end_command(&psmouse->ps2dev);
 138
 139         return rc;
 140 }
 141
 142 static bool cypress_verify_cmd_state(struct psmouse *psmouse,
 143                                      unsigned char cmd, unsigned char *param)
 144 {
 145         bool rate_match = false;
 146         bool resolution_match = false;
 147         int i;
 148
 149         /* callers will do further checking. */
 150         if (cmd == CYTP_CMD_READ_CYPRESS_ID ||
 151             cmd == CYTP_CMD_STANDARD_MODE ||
 152             cmd == CYTP_CMD_READ_TP_METRICS)
 153                 return true;
 154
 155         if ((~param[0] & DFLT_RESP_BITS_VALID) == DFLT_RESP_BITS_VALID &&
 156             (param[0] & DFLT_RESP_BIT_MODE) == DFLT_RESP_STREAM_MODE) {
 157                 for (i = 0; i < sizeof(cytp_resolution); i++)
 158                         if (cytp_resolution[i] == param[1])
 159                                 resolution_match = true;
 160
 161                 for (i = 0; i < sizeof(cytp_rate); i++)
 162                         if (cytp_rate[i] == param[2])
 163                                 rate_match = true;
 164
 165                 if (resolution_match && rate_match)
 166                         return true;
 167         }
 168
 169         psmouse_dbg(psmouse, "verify cmd state failed.\n");
 170         return false;
 171 }
 172
 173 static int cypress_send_ext_cmd(struct psmouse *psmouse, unsigned char cmd,
 174                                 unsigned char *param)
 175 {
 176         int tries = CYTP_PS2_CMD_TRIES;
 177         int rc;
 178
 179         psmouse_dbg(psmouse, "send extension cmd 0x%02x, [%d %d %d %d]\n",
 180                  cmd, DECODE_CMD_AA(cmd), DECODE_CMD_BB(cmd),
 181                  DECODE_CMD_CC(cmd), DECODE_CMD_DD(cmd));
 182
 183         do {
 184                 cypress_ps2_ext_cmd(psmouse,
 185                                     PSMOUSE_CMD_SETRES, DECODE_CMD_DD(cmd));
 186                 cypress_ps2_ext_cmd(psmouse,
 187                                     PSMOUSE_CMD_SETRES, DECODE_CMD_CC(cmd));
 188                 cypress_ps2_ext_cmd(psmouse,
 189                                     PSMOUSE_CMD_SETRES, DECODE_CMD_BB(cmd));
 190                 cypress_ps2_ext_cmd(psmouse,
 191                                     PSMOUSE_CMD_SETRES, DECODE_CMD_AA(cmd));
 192
 193                 rc = cypress_ps2_read_cmd_status(psmouse, cmd, param);
 194                 if (rc)
 195                         continue;
 196
 197                 if (cypress_verify_cmd_state(psmouse, cmd, param))
 198                         return 0;
 199
 200         } while (--tries > 0);
 201
 202         return -EIO;
 203 }
 204
 205 int cypress_detect(struct psmouse *psmouse, bool set_properties)
 206 {
 207         unsigned char param[3];
 208
 209         if (cypress_send_ext_cmd(psmouse, CYTP_CMD_READ_CYPRESS_ID, param))
 210                 return -ENODEV;
 211
 212         /* Check for Cypress Trackpad signature bytes: 0x33 0xCC */
 213         if (param[0] != 0x33 || param[1] != 0xCC)
 214                 return -ENODEV;
 215
 216         if (set_properties) {
 217                 psmouse->vendor = "Cypress";
 218                 psmouse->name = "Trackpad";
 219         }
 220
 221         return 0;
 222 }
 223
 224 static int cypress_read_fw_version(struct psmouse *psmouse)
 225 {
 226         struct cytp_data *cytp = psmouse->private;
 227         unsigned char param[3];
 228
 229         if (cypress_send_ext_cmd(psmouse, CYTP_CMD_READ_CYPRESS_ID, param))
 230                 return -ENODEV;
 231
 232         /* Check for Cypress Trackpad signature bytes: 0x33 0xCC */
 233         if (param[0] != 0x33 || param[1] != 0xCC)
 234                 return -ENODEV;
 235
 236         cytp->fw_version = param[2] & FW_VERSION_MASX;
 237         cytp->tp_metrics_supported = (param[2] & TP_METRICS_MASK) ? 1 : 0;
 238
 239         /*
 240          * Trackpad fw_version 11 (in Dell XPS12) yields a bogus response to
 241          * CYTP_CMD_READ_TP_METRICS so do not try to use it. LP: #1103594.
 242          */
 243         if (cytp->fw_version >= 11)
 244                 cytp->tp_metrics_supported = 0;
 245
 246         psmouse_dbg(psmouse, "cytp->fw_version = %d\n", cytp->fw_version);
 247         psmouse_dbg(psmouse, "cytp->tp_metrics_supported = %d\n",
 248                  cytp->tp_metrics_supported);
 249
 250         return 0;
 251 }
 252
 253 static int cypress_read_tp_metrics(struct psmouse *psmouse)
 254 {
 255         struct cytp_data *cytp = psmouse->private;
 256         unsigned char param[8];
 257
 258         /* set default values for tp metrics. */
 259         cytp->tp_width = CYTP_DEFAULT_WIDTH;
 260         cytp->tp_high = CYTP_DEFAULT_HIGH;
 261         cytp->tp_max_abs_x = CYTP_ABS_MAX_X;
 262         cytp->tp_max_abs_y = CYTP_ABS_MAX_Y;
 263         cytp->tp_min_pressure = CYTP_MIN_PRESSURE;
 264         cytp->tp_max_pressure = CYTP_MAX_PRESSURE;
 265         cytp->tp_res_x = cytp->tp_max_abs_x / cytp->tp_width;
 266         cytp->tp_res_y = cytp->tp_max_abs_y / cytp->tp_high;
 267
 268         if (!cytp->tp_metrics_supported)
 269                 return 0;
 270
 271         memset(param, 0, sizeof(param));
 272         if (cypress_send_ext_cmd(psmouse, CYTP_CMD_READ_TP_METRICS, param) == 0) {
 273                 /* Update trackpad parameters. */
 274                 cytp->tp_max_abs_x = (param[1] << 8) | param[0];
 275                 cytp->tp_max_abs_y = (param[3] << 8) | param[2];
 276                 cytp->tp_min_pressure = param[4];
 277                 cytp->tp_max_pressure = param[5];
 278         }
 279
 280         if (!cytp->tp_max_pressure ||
 281             cytp->tp_max_pressure < cytp->tp_min_pressure ||
 282             !cytp->tp_width || !cytp->tp_high ||
 283             !cytp->tp_max_abs_x ||
 284             cytp->tp_max_abs_x < cytp->tp_width ||
 285             !cytp->tp_max_abs_y ||
 286             cytp->tp_max_abs_y < cytp->tp_high)
 287                 return -EINVAL;
 288
 289         cytp->tp_res_x = cytp->tp_max_abs_x / cytp->tp_width;
 290         cytp->tp_res_y = cytp->tp_max_abs_y / cytp->tp_high;
 291
 292 #ifdef CYTP_DEBUG_VERBOSE
 293         psmouse_dbg(psmouse, "Dump trackpad hardware configuration as below:\n");
 294         psmouse_dbg(psmouse, "cytp->tp_width = %d\n", cytp->tp_width);
 295         psmouse_dbg(psmouse, "cytp->tp_high = %d\n", cytp->tp_high);
 296         psmouse_dbg(psmouse, "cytp->tp_max_abs_x = %d\n", cytp->tp_max_abs_x);
 297         psmouse_dbg(psmouse, "cytp->tp_max_abs_y = %d\n", cytp->tp_max_abs_y);
 298         psmouse_dbg(psmouse, "cytp->tp_min_pressure = %d\n", cytp->tp_min_pressure);
 299         psmouse_dbg(psmouse, "cytp->tp_max_pressure = %d\n", cytp->tp_max_pressure);
 300         psmouse_dbg(psmouse, "cytp->tp_res_x = %d\n", cytp->tp_res_x);
 301         psmouse_dbg(psmouse, "cytp->tp_res_y = %d\n", cytp->tp_res_y);
 302
 303         psmouse_dbg(psmouse, "tp_type_APA = %d\n",
 304                         (param[6] & TP_METRICS_BIT_APA) ? 1 : 0);
 305         psmouse_dbg(psmouse, "tp_type_MTG = %d\n",
 306                         (param[6] & TP_METRICS_BIT_MTG) ? 1 : 0);
 307         psmouse_dbg(psmouse, "tp_palm = %d\n",
 308                         (param[6] & TP_METRICS_BIT_PALM) ? 1 : 0);
 309         psmouse_dbg(psmouse, "tp_stubborn = %d\n",
 310                         (param[6] & TP_METRICS_BIT_STUBBORN) ? 1 : 0);
 311         psmouse_dbg(psmouse, "tp_1f_jitter = %d\n",
 312                         (param[6] & TP_METRICS_BIT_1F_JITTER) >> 2);
 313         psmouse_dbg(psmouse, "tp_2f_jitter = %d\n",
 314                         (param[6] & TP_METRICS_BIT_2F_JITTER) >> 4);
 315         psmouse_dbg(psmouse, "tp_1f_spike = %d\n",
 316                         param[7] & TP_METRICS_BIT_1F_SPIKE);
 317         psmouse_dbg(psmouse, "tp_2f_spike = %d\n",
 318                         (param[7] & TP_METRICS_BIT_2F_SPIKE) >> 2);
 319         psmouse_dbg(psmouse, "tp_abs_packet_format_set = %d\n",
 320                         (param[7] & TP_METRICS_BIT_ABS_PKT_FORMAT_SET) >> 4);
 321 #endif
 322
 323         return 0;
 324 }
 325
 326 static int cypress_query_hardware(struct psmouse *psmouse)
 327 {
 328         int ret;
 329
 330         ret = cypress_read_fw_version(psmouse);
 331         if (ret)
 332                 return ret;
 333
 334         ret = cypress_read_tp_metrics(psmouse);
 335         if (ret)
 336                 return ret;
 337
 338         return 0;
 339 }
 340
 341 static int cypress_set_absolute_mode(struct psmouse *psmouse)
 342 {
 343         struct cytp_data *cytp = psmouse->private;
 344         unsigned char param[3];
 345
 346         if (cypress_send_ext_cmd(psmouse, CYTP_CMD_ABS_WITH_PRESSURE_MODE, param) < 0)
 347                 return -1;
 348
 349         cytp->mode = (cytp->mode & ~CYTP_BIT_ABS_REL_MASK)
 350                         | CYTP_BIT_ABS_PRESSURE;
 351         cypress_set_packet_size(psmouse, 5);
 352
 353         return 0;
 354 }
 355
 356 /*
 357  * Reset trackpad device.
 358  * This is also the default mode when trackpad powered on.
 359  */
 360 static void cypress_reset(struct psmouse *psmouse)
 361 {
 362         struct cytp_data *cytp = psmouse->private;
 363
 364         cytp->mode = 0;
 365
 366         psmouse_reset(psmouse);
 367 }
 368
 369 static int cypress_set_input_params(struct input_dev *input,
 370                                     struct cytp_data *cytp)
 371 {
 372         int ret;
 373
 374         if (!cytp->tp_res_x || !cytp->tp_res_y)
 375                 return -EINVAL;
 376
 377         __set_bit(EV_ABS, input->evbit);
 378         input_set_abs_params(input, ABS_X, 0, cytp->tp_max_abs_x, 0, 0);
 379         input_set_abs_params(input, ABS_Y, 0, cytp->tp_max_abs_y, 0, 0);
 380         input_set_abs_params(input, ABS_PRESSURE,
 381                              cytp->tp_min_pressure, cytp->tp_max_pressure, 0, 0);
 382         input_set_abs_params(input, ABS_TOOL_WIDTH, 0, 255, 0, 0);
 383
 384         /* finger position */
 385         input_set_abs_params(input, ABS_MT_POSITION_X, 0, cytp->tp_max_abs_x, 0, 0);
 386         input_set_abs_params(input, ABS_MT_POSITION_Y, 0, cytp->tp_max_abs_y, 0, 0);
 387         input_set_abs_params(input, ABS_MT_PRESSURE, 0, 255, 0, 0);
 388
 389         ret = input_mt_init_slots(input, CYTP_MAX_MT_SLOTS,
 390                         INPUT_MT_DROP_UNUSED|INPUT_MT_TRACK);
 391         if (ret < 0)
 392                 return ret;
 393
 394         __set_bit(INPUT_PROP_SEMI_MT, input->propbit);
 395
 396         input_abs_set_res(input, ABS_X, cytp->tp_res_x);
 397         input_abs_set_res(input, ABS_Y, cytp->tp_res_y);
 398
 399         input_abs_set_res(input, ABS_MT_POSITION_X, cytp->tp_res_x);
 400         input_abs_set_res(input, ABS_MT_POSITION_Y, cytp->tp_res_y);
 401
 402         __set_bit(BTN_TOUCH, input->keybit);
 403         __set_bit(BTN_TOOL_FINGER, input->keybit);
 404         __set_bit(BTN_TOOL_DOUBLETAP, input->keybit);
 405         __set_bit(BTN_TOOL_TRIPLETAP, input->keybit);
 406         __set_bit(BTN_TOOL_QUADTAP, input->keybit);
 407         __set_bit(BTN_TOOL_QUINTTAP, input->keybit);
 408
 409         __clear_bit(EV_REL, input->evbit);
 410         __clear_bit(REL_X, input->relbit);
 411         __clear_bit(REL_Y, input->relbit);
 412
 413         __set_bit(INPUT_PROP_BUTTONPAD, input->propbit);
 414         __set_bit(EV_KEY, input->evbit);
 415         __set_bit(BTN_LEFT, input->keybit);
 416         __set_bit(BTN_RIGHT, input->keybit);
 417         __set_bit(BTN_MIDDLE, input->keybit);
 418
 419         input_set_drvdata(input, cytp);
 420
 421         return 0;
 422 }
 423
 424 static int cypress_get_finger_count(unsigned char header_byte)
 425 {
 426         unsigned char bits6_7;
 427         int finger_count;
 428
 429         bits6_7 = header_byte >> 6;
 430         finger_count = bits6_7 & 0x03;
 431
 432         if (finger_count == 1)
 433                 return 1;
 434
 435         if (header_byte & ABS_HSCROLL_BIT) {
 436                 /* HSCROLL gets added on to 0 finger count. */
 437                 switch (finger_count) {
 438                         case 0: return 4;
 439                         case 2: return 5;
 440                         default:
 441                                 /* Invalid contact (e.g. palm). Ignore it. */
 442                                 return 0;
 443                 }
 444         }
 445
 446         return finger_count;
 447 }
 448
 449
 450 static int cypress_parse_packet(struct psmouse *psmouse,
 451                                 struct cytp_data *cytp, struct cytp_report_data *report_data)
 452 {
 453         unsigned char *packet = psmouse->packet;
 454         unsigned char header_byte = packet[0];
 455
 456         memset(report_data, 0, sizeof(struct cytp_report_data));
 457
 458         report_data->contact_cnt = cypress_get_finger_count(header_byte);
 459         report_data->tap = (header_byte & ABS_MULTIFINGER_TAP) ? 1 : 0;
 460
 461         if (report_data->contact_cnt == 1) {
 462                 report_data->contacts[0].x =
 463                         ((packet[1] & 0x70) << 4) | packet[2];
 464                 report_data->contacts[0].y =
 465                         ((packet[1] & 0x07) << 8) | packet[3];
 466                 if (cytp->mode & CYTP_BIT_ABS_PRESSURE)
 467                         report_data->contacts[0].z = packet[4];
 468
 469         } else if (report_data->contact_cnt >= 2) {
 470                 report_data->contacts[0].x =
 471                         ((packet[1] & 0x70) << 4) | packet[2];
 472                 report_data->contacts[0].y =
 473                         ((packet[1] & 0x07) << 8) | packet[3];
 474                 if (cytp->mode & CYTP_BIT_ABS_PRESSURE)
 475                         report_data->contacts[0].z = packet[4];
 476
 477                 report_data->contacts[1].x =
 478                         ((packet[5] & 0xf0) << 4) | packet[6];
 479                 report_data->contacts[1].y =
 480                         ((packet[5] & 0x0f) << 8) | packet[7];
 481                 if (cytp->mode & CYTP_BIT_ABS_PRESSURE)
 482                         report_data->contacts[1].z = report_data->contacts[0].z;
 483         }
 484
 485         report_data->left = (header_byte & BTN_LEFT_BIT) ? 1 : 0;
 486         report_data->right = (header_byte & BTN_RIGHT_BIT) ? 1 : 0;
 487
 488         /*
 489          * This is only true if one of the mouse buttons were tapped.  Make
 490          * sure it doesn't turn into a click. The regular tap-to-click
 491          * functionality will handle that on its own. If we don't do this,
 492          * disabling tap-to-click won't affect the mouse button zones.
 493          */
 494         if (report_data->tap)
 495                 report_data->left = 0;
 496
 497 #ifdef CYTP_DEBUG_VERBOSE
 498         {
 499                 int i;
 500                 int n = report_data->contact_cnt;
 501                 psmouse_dbg(psmouse, "Dump parsed report data as below:\n");
 502                 psmouse_dbg(psmouse, "contact_cnt = %d\n",
 503                         report_data->contact_cnt);
 504                 if (n > CYTP_MAX_MT_SLOTS)
 505                     n = CYTP_MAX_MT_SLOTS;
 506                 for (i = 0; i < n; i++)
 507                         psmouse_dbg(psmouse, "contacts[%d] = {%d, %d, %d}\n", i,
 508                                         report_data->contacts[i].x,
 509                                         report_data->contacts[i].y,
 510                                         report_data->contacts[i].z);
 511                 psmouse_dbg(psmouse, "left = %d\n", report_data->left);
 512                 psmouse_dbg(psmouse, "right = %d\n", report_data->right);
 513                 psmouse_dbg(psmouse, "middle = %d\n", report_data->middle);
 514         }
 515 #endif
 516
 517         return 0;
 518 }
 519
 520 static void cypress_process_packet(struct psmouse *psmouse, bool zero_pkt)
 521 {
 522         int i;
 523         struct input_dev *input = psmouse->dev;
 524         struct cytp_data *cytp = psmouse->private;
 525         struct cytp_report_data report_data;
 526         struct cytp_contact *contact;
 527         struct input_mt_pos pos[CYTP_MAX_MT_SLOTS];
 528         int slots[CYTP_MAX_MT_SLOTS];
 529         int n;
 530
 531         cypress_parse_packet(psmouse, cytp, &report_data);
 532
 533         n = report_data.contact_cnt;
 534         if (n > CYTP_MAX_MT_SLOTS)
 535                 n = CYTP_MAX_MT_SLOTS;
 536
 537         for (i = 0; i < n; i++) {
 538                 contact = &report_data.contacts[i];
 539                 pos[i].x = contact->x;
 540                 pos[i].y = contact->y;
 541         }
 542
 543         input_mt_assign_slots(input, slots, pos, n);
 544
 545         for (i = 0; i < n; i++) {
 546                 contact = &report_data.contacts[i];
 547                 input_mt_slot(input, slots[i]);
 548                 input_mt_report_slot_state(input, MT_TOOL_FINGER, true);
 549                 input_report_abs(input, ABS_MT_POSITION_X, contact->x);
 550                 input_report_abs(input, ABS_MT_POSITION_Y, contact->y);
 551                 input_report_abs(input, ABS_MT_PRESSURE, contact->z);
 552         }
 553
 554         input_mt_sync_frame(input);
 555
 556         input_mt_report_finger_count(input, report_data.contact_cnt);
 557
 558         input_report_key(input, BTN_LEFT, report_data.left);
 559         input_report_key(input, BTN_RIGHT, report_data.right);
 560         input_report_key(input, BTN_MIDDLE, report_data.middle);
 561
 562         input_sync(input);
 563 }
 564
 565 static psmouse_ret_t cypress_validate_byte(struct psmouse *psmouse)
 566 {
 567         int contact_cnt;
 568         int index = psmouse->pktcnt - 1;
 569         unsigned char *packet = psmouse->packet;
 570         struct cytp_data *cytp = psmouse->private;
 571
 572         if (index < 0 || index > cytp->pkt_size)
 573                 return PSMOUSE_BAD_DATA;
 574
 575         if (index == 0 && (packet[0] & 0xfc) == 0) {
 576                 /* call packet process for reporting finger leave. */
 577                 cypress_process_packet(psmouse, 1);
 578                 return PSMOUSE_FULL_PACKET;
 579         }
 580
 581         /*
 582          * Perform validation (and adjust packet size) based only on the
 583          * first byte; allow all further bytes through.
 584          */
 585         if (index != 0)
 586                 return PSMOUSE_GOOD_DATA;
 587
 588         /*
 589          * If absolute/relative mode bit has not been set yet, just pass
 590          * the byte through.
 591          */
 592         if ((cytp->mode & CYTP_BIT_ABS_REL_MASK) == 0)
 593                 return PSMOUSE_GOOD_DATA;
 594
 595         if ((packet[0] & 0x08) == 0x08)
 596                 return PSMOUSE_BAD_DATA;
 597
 598         contact_cnt = cypress_get_finger_count(packet[0]);
 599         if (cytp->mode & CYTP_BIT_ABS_NO_PRESSURE)
 600                 cypress_set_packet_size(psmouse, contact_cnt == 2 ? 7 : 4);
 601         else
 602                 cypress_set_packet_size(psmouse, contact_cnt == 2 ? 8 : 5);
 603
 604         return PSMOUSE_GOOD_DATA;
 605 }
 606
 607 static psmouse_ret_t cypress_protocol_handler(struct psmouse *psmouse)
 608 {
 609         struct cytp_data *cytp = psmouse->private;
 610
 611         if (psmouse->pktcnt >= cytp->pkt_size) {
 612                 cypress_process_packet(psmouse, 0);
 613                 return PSMOUSE_FULL_PACKET;
 614         }
 615
 616         return cypress_validate_byte(psmouse);
 617 }
 618
 619 static void cypress_set_rate(struct psmouse *psmouse, unsigned int rate)
 620 {
 621         struct cytp_data *cytp = psmouse->private;
 622
 623         if (rate >= 80) {
 624                 psmouse->rate = 80;
 625                 cytp->mode |= CYTP_BIT_HIGH_RATE;
 626         } else {
 627                 psmouse->rate = 40;
 628                 cytp->mode &= ~CYTP_BIT_HIGH_RATE;
 629         }
 630
 631         ps2_command(&psmouse->ps2dev, (unsigned char *)&psmouse->rate,
 632                     PSMOUSE_CMD_SETRATE);
 633 }
 634
 635 static void cypress_disconnect(struct psmouse *psmouse)
 636 {
 637         cypress_reset(psmouse);
 638         kfree(psmouse->private);
 639         psmouse->private = NULL;
 640 }
 641
 642 static int cypress_reconnect(struct psmouse *psmouse)
 643 {
 644         int tries = CYTP_PS2_CMD_TRIES;
 645         int rc;
 646
 647         do {
 648                 cypress_reset(psmouse);
 649                 rc = cypress_detect(psmouse, false);
 650         } while (rc && (--tries > 0));
 651
 652         if (rc) {
 653                 psmouse_err(psmouse, "Reconnect: unable to detect trackpad.\n");
 654                 return -1;
 655         }
 656
 657         if (cypress_set_absolute_mode(psmouse)) {
 658                 psmouse_err(psmouse, "Reconnect: Unable to initialize Cypress absolute mode.\n");
 659                 return -1;
 660         }
 661
 662         return 0;
 663 }
 664
 665 int cypress_init(struct psmouse *psmouse)
 666 {
 667         struct cytp_data *cytp;
 668
 669         cytp = kzalloc(sizeof(struct cytp_data), GFP_KERNEL);
 670         if (!cytp)
 671                 return -ENOMEM;
 672
 673         psmouse->private = cytp;
 674         psmouse->pktsize = 8;
 675
 676         cypress_reset(psmouse);
 677
 678         if (cypress_query_hardware(psmouse)) {
 679                 psmouse_err(psmouse, "Unable to query Trackpad hardware.\n");
 680                 goto err_exit;
 681         }
 682
 683         if (cypress_set_absolute_mode(psmouse)) {
 684                 psmouse_err(psmouse, "init: Unable to initialize Cypress absolute mode.\n");
 685                 goto err_exit;
 686         }
 687
 688         if (cypress_set_input_params(psmouse->dev, cytp) < 0) {
 689                 psmouse_err(psmouse, "init: Unable to set input params.\n");
 690                 goto err_exit;
 691         }
 692
 693         psmouse->model = 1;
 694         psmouse->protocol_handler = cypress_protocol_handler;
 695         psmouse->set_rate = cypress_set_rate;
 696         psmouse->disconnect = cypress_disconnect;
 697         psmouse->reconnect = cypress_reconnect;
 698         psmouse->cleanup = cypress_reset;
 699         psmouse->resync_time = 0;
 700
 701         return 0;
 702
 703 err_exit:
 704         /*
 705          * Reset Cypress Trackpad as a standard mouse. Then
 706          * let psmouse driver commmunicating with it as default PS2 mouse.
 707          */
 708         cypress_reset(psmouse);
 709
 710         psmouse->private = NULL;
 711         kfree(cytp);
 712
 713         return -1;
 714 }
 715
 716 bool cypress_supported(void)
 717 {
 718         return true;
 719 }