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/module.h>
  19 #include <linux/kernel.h>
  20 #include <linux/slab.h>
  21 #include <linux/serio.h>
  22 #include <linux/libps2.h>
  23 #include <linux/input.h>
  24 #include <linux/input/mt.h>
  25 #include <linux/sched.h>
  26 #include <linux/wait.h>
  27
  28 #include "cypress_ps2.h"
  29
  30 #undef CYTP_DEBUG_VERBOSE  /* define this and DEBUG for more verbose dump */
  31
  32 static void cypress_set_packet_size(struct psmouse *psmouse, unsigned int n)
  33 {
  34         struct cytp_data *cytp = psmouse->private;
  35         cytp->pkt_size = n;
  36 }
  37
  38 static const unsigned char cytp_rate[] = {10, 20, 40, 60, 100, 200};
  39 static const unsigned char cytp_resolution[] = {0x00, 0x01, 0x02, 0x03};
  40
  41 static int cypress_ps2_sendbyte(struct psmouse *psmouse, int value)
  42 {
  43         struct ps2dev *ps2dev = &psmouse->ps2dev;
  44
  45         if (ps2_sendbyte(ps2dev, value & 0xff, CYTP_CMD_TIMEOUT) < 0) {
  46                 psmouse_dbg(psmouse,
  47                                 "sending command 0x%02x failed, resp 0x%02x\n",
  48                                 value & 0xff, ps2dev->nak);
  49                 if (ps2dev->nak == CYTP_PS2_RETRY)
  50                         return CYTP_PS2_RETRY;
  51                 else
  52                         return CYTP_PS2_ERROR;
  53         }
  54
  55 #ifdef CYTP_DEBUG_VERBOSE
  56         psmouse_dbg(psmouse, "sending command 0x%02x succeeded, resp 0xfa\n",
  57                         value & 0xff);
  58 #endif
  59
  60         return 0;
  61 }
  62
  63 static int cypress_ps2_ext_cmd(struct psmouse *psmouse, unsigned short cmd,
  64                                unsigned char data)
  65 {
  66         struct ps2dev *ps2dev = &psmouse->ps2dev;
  67         int tries = CYTP_PS2_CMD_TRIES;
  68         int rc;
  69
  70         ps2_begin_command(ps2dev);
  71
  72         do {
  73                 /*
  74                  * Send extension command byte (0xE8 or 0xF3).
  75                  * If sending the command fails, send recovery command
  76                  * to make the device return to the ready state.
  77                  */
  78                 rc = cypress_ps2_sendbyte(psmouse, cmd & 0xff);
  79                 if (rc == CYTP_PS2_RETRY) {
  80                         rc = cypress_ps2_sendbyte(psmouse, 0x00);
  81                         if (rc == CYTP_PS2_RETRY)
  82                                 rc = cypress_ps2_sendbyte(psmouse, 0x0a);
  83                 }
  84                 if (rc == CYTP_PS2_ERROR)
  85                         continue;
  86
  87                 rc = cypress_ps2_sendbyte(psmouse, data);
  88                 if (rc == CYTP_PS2_RETRY)
  89                         rc = cypress_ps2_sendbyte(psmouse, data);
  90                 if (rc == CYTP_PS2_ERROR)
  91                         continue;
  92                 else
  93                         break;
  94         } while (--tries > 0);
  95
  96         ps2_end_command(ps2dev);
  97
  98         return rc;
  99 }
 100
 101 static int cypress_ps2_read_cmd_status(struct psmouse *psmouse,
 102                                        unsigned char cmd,
 103                                        unsigned char *param)
 104 {
 105         int rc;
 106         struct ps2dev *ps2dev = &psmouse->ps2dev;
 107         enum psmouse_state old_state;
 108         int pktsize;
 109
 110         ps2_begin_command(ps2dev);
 111
 112         old_state = psmouse->state;
 113         psmouse->state = PSMOUSE_CMD_MODE;
 114         psmouse->pktcnt = 0;
 115
 116         pktsize = (cmd == CYTP_CMD_READ_TP_METRICS) ? 8 : 3;
 117         memset(param, 0, pktsize);
 118
 119         rc = cypress_ps2_sendbyte(psmouse, 0xe9);
 120         if (rc < 0)
 121                 goto out;
 122
 123         wait_event_timeout(ps2dev->wait,
 124                         (psmouse->pktcnt >= pktsize),
 125                         msecs_to_jiffies(CYTP_CMD_TIMEOUT));
 126
 127         memcpy(param, psmouse->packet, pktsize);
 128
 129         psmouse_dbg(psmouse, "Command 0x%02x response data (0x): %*ph\n",
 130                         cmd, pktsize, param);
 131
 132 out:
 133         psmouse->state = old_state;
 134         psmouse->pktcnt = 0;
 135
 136         ps2_end_command(ps2dev);
 137
 138         return rc;
 139 }
 140
 141 static bool cypress_verify_cmd_state(struct psmouse *psmouse,
 142                                      unsigned char cmd, unsigned char *param)
 143 {
 144         bool rate_match = false;
 145         bool resolution_match = false;
 146         int i;
 147
 148         /* callers will do further checking. */
 149         if (cmd == CYTP_CMD_READ_CYPRESS_ID ||
 150             cmd == CYTP_CMD_STANDARD_MODE ||
 151             cmd == CYTP_CMD_READ_TP_METRICS)
 152                 return true;
 153
 154         if ((~param[0] & DFLT_RESP_BITS_VALID) == DFLT_RESP_BITS_VALID &&
 155             (param[0] & DFLT_RESP_BIT_MODE) == DFLT_RESP_STREAM_MODE) {
 156                 for (i = 0; i < sizeof(cytp_resolution); i++)
 157                         if (cytp_resolution[i] == param[1])
 158                                 resolution_match = true;
 159
 160                 for (i = 0; i < sizeof(cytp_rate); i++)
 161                         if (cytp_rate[i] == param[2])
 162                                 rate_match = true;
 163
 164                 if (resolution_match && rate_match)
 165                         return true;
 166         }
 167
 168         psmouse_dbg(psmouse, "verify cmd state failed.\n");
 169         return false;
 170 }
 171
 172 static int cypress_send_ext_cmd(struct psmouse *psmouse, unsigned char cmd,
 173                                 unsigned char *param)
 174 {
 175         int tries = CYTP_PS2_CMD_TRIES;
 176         int rc;
 177
 178         psmouse_dbg(psmouse, "send extension cmd 0x%02x, [%d %d %d %d]\n",
 179                  cmd, DECODE_CMD_AA(cmd), DECODE_CMD_BB(cmd),
 180                  DECODE_CMD_CC(cmd), DECODE_CMD_DD(cmd));
 181
 182         do {
 183                 cypress_ps2_ext_cmd(psmouse,
 184                                     PSMOUSE_CMD_SETRES, DECODE_CMD_DD(cmd));
 185                 cypress_ps2_ext_cmd(psmouse,
 186                                     PSMOUSE_CMD_SETRES, DECODE_CMD_CC(cmd));
 187                 cypress_ps2_ext_cmd(psmouse,
 188                                     PSMOUSE_CMD_SETRES, DECODE_CMD_BB(cmd));
 189                 cypress_ps2_ext_cmd(psmouse,
 190                                     PSMOUSE_CMD_SETRES, DECODE_CMD_AA(cmd));
 191
 192                 rc = cypress_ps2_read_cmd_status(psmouse, cmd, param);
 193                 if (rc)
 194                         continue;
 195
 196                 if (cypress_verify_cmd_state(psmouse, cmd, param))
 197                         return 0;
 198
 199         } while (--tries > 0);
 200
 201         return -EIO;
 202 }
 203
 204 int cypress_detect(struct psmouse *psmouse, bool set_properties)
 205 {
 206         unsigned char param[3];
 207
 208         if (cypress_send_ext_cmd(psmouse, CYTP_CMD_READ_CYPRESS_ID, param))
 209                 return -ENODEV;
 210
 211         /* Check for Cypress Trackpad signature bytes: 0x33 0xCC */
 212         if (param[0] != 0x33 || param[1] != 0xCC)
 213                 return -ENODEV;
 214
 215         if (set_properties) {
 216                 psmouse->vendor = "Cypress";
 217                 psmouse->name = "Trackpad";
 218         }
 219
 220         return 0;
 221 }
 222
 223 static int cypress_read_fw_version(struct psmouse *psmouse)
 224 {
 225         struct cytp_data *cytp = psmouse->private;
 226         unsigned char param[3];
 227
 228         if (cypress_send_ext_cmd(psmouse, CYTP_CMD_READ_CYPRESS_ID, param))
 229                 return -ENODEV;
 230
 231         /* Check for Cypress Trackpad signature bytes: 0x33 0xCC */
 232         if (param[0] != 0x33 || param[1] != 0xCC)
 233                 return -ENODEV;
 234
 235         cytp->fw_version = param[2] & FW_VERSION_MASX;
 236         cytp->tp_metrics_supported = (param[2] & TP_METRICS_MASK) ? 1 : 0;
 237
 238         /*
 239          * Trackpad fw_version 11 (in Dell XPS12) yields a bogus response to
 240          * CYTP_CMD_READ_TP_METRICS so do not try to use it. LP: #1103594.
 241          */
 242         if (cytp->fw_version >= 11)
 243                 cytp->tp_metrics_supported = 0;
 244
 245         psmouse_dbg(psmouse, "cytp->fw_version = %d\n", cytp->fw_version);
 246         psmouse_dbg(psmouse, "cytp->tp_metrics_supported = %d\n",
 247                  cytp->tp_metrics_supported);
 248
 249         return 0;
 250 }
 251
 252 static int cypress_read_tp_metrics(struct psmouse *psmouse)
 253 {
 254         struct cytp_data *cytp = psmouse->private;
 255         unsigned char param[8];
 256
 257         /* set default values for tp metrics. */
 258         cytp->tp_width = CYTP_DEFAULT_WIDTH;
 259         cytp->tp_high = CYTP_DEFAULT_HIGH;
 260         cytp->tp_max_abs_x = CYTP_ABS_MAX_X;
 261         cytp->tp_max_abs_y = CYTP_ABS_MAX_Y;
 262         cytp->tp_min_pressure = CYTP_MIN_PRESSURE;
 263         cytp->tp_max_pressure = CYTP_MAX_PRESSURE;
 264         cytp->tp_res_x = cytp->tp_max_abs_x / cytp->tp_width;
 265         cytp->tp_res_y = cytp->tp_max_abs_y / cytp->tp_high;
 266
 267         if (!cytp->tp_metrics_supported)
 268                 return 0;
 269
 270         memset(param, 0, sizeof(param));
 271         if (cypress_send_ext_cmd(psmouse, CYTP_CMD_READ_TP_METRICS, param) == 0) {
 272                 /* Update trackpad parameters. */
 273                 cytp->tp_max_abs_x = (param[1] << 8) | param[0];
 274                 cytp->tp_max_abs_y = (param[3] << 8) | param[2];
 275                 cytp->tp_min_pressure = param[4];
 276                 cytp->tp_max_pressure = param[5];
 277         }
 278
 279         if (!cytp->tp_max_pressure ||
 280             cytp->tp_max_pressure < cytp->tp_min_pressure ||
 281             !cytp->tp_width || !cytp->tp_high ||
 282             !cytp->tp_max_abs_x ||
 283             cytp->tp_max_abs_x < cytp->tp_width ||
 284             !cytp->tp_max_abs_y ||
 285             cytp->tp_max_abs_y < cytp->tp_high)
 286                 return -EINVAL;
 287
 288         cytp->tp_res_x = cytp->tp_max_abs_x / cytp->tp_width;
 289         cytp->tp_res_y = cytp->tp_max_abs_y / cytp->tp_high;
 290
 291 #ifdef CYTP_DEBUG_VERBOSE
 292         psmouse_dbg(psmouse, "Dump trackpad hardware configuration as below:\n");
 293         psmouse_dbg(psmouse, "cytp->tp_width = %d\n", cytp->tp_width);
 294         psmouse_dbg(psmouse, "cytp->tp_high = %d\n", cytp->tp_high);
 295         psmouse_dbg(psmouse, "cytp->tp_max_abs_x = %d\n", cytp->tp_max_abs_x);
 296         psmouse_dbg(psmouse, "cytp->tp_max_abs_y = %d\n", cytp->tp_max_abs_y);
 297         psmouse_dbg(psmouse, "cytp->tp_min_pressure = %d\n", cytp->tp_min_pressure);
 298         psmouse_dbg(psmouse, "cytp->tp_max_pressure = %d\n", cytp->tp_max_pressure);
 299         psmouse_dbg(psmouse, "cytp->tp_res_x = %d\n", cytp->tp_res_x);
 300         psmouse_dbg(psmouse, "cytp->tp_res_y = %d\n", cytp->tp_res_y);
 301
 302         psmouse_dbg(psmouse, "tp_type_APA = %d\n",
 303                         (param[6] & TP_METRICS_BIT_APA) ? 1 : 0);
 304         psmouse_dbg(psmouse, "tp_type_MTG = %d\n",
 305                         (param[6] & TP_METRICS_BIT_MTG) ? 1 : 0);
 306         psmouse_dbg(psmouse, "tp_palm = %d\n",
 307                         (param[6] & TP_METRICS_BIT_PALM) ? 1 : 0);
 308         psmouse_dbg(psmouse, "tp_stubborn = %d\n",
 309                         (param[6] & TP_METRICS_BIT_STUBBORN) ? 1 : 0);
 310         psmouse_dbg(psmouse, "tp_1f_jitter = %d\n",
 311                         (param[6] & TP_METRICS_BIT_1F_JITTER) >> 2);
 312         psmouse_dbg(psmouse, "tp_2f_jitter = %d\n",
 313                         (param[6] & TP_METRICS_BIT_2F_JITTER) >> 4);
 314         psmouse_dbg(psmouse, "tp_1f_spike = %d\n",
 315                         param[7] & TP_METRICS_BIT_1F_SPIKE);
 316         psmouse_dbg(psmouse, "tp_2f_spike = %d\n",
 317                         (param[7] & TP_METRICS_BIT_2F_SPIKE) >> 2);
 318         psmouse_dbg(psmouse, "tp_abs_packet_format_set = %d\n",
 319                         (param[7] & TP_METRICS_BIT_ABS_PKT_FORMAT_SET) >> 4);
 320 #endif
 321
 322         return 0;
 323 }
 324
 325 static int cypress_query_hardware(struct psmouse *psmouse)
 326 {
 327         int ret;
 328
 329         ret = cypress_read_fw_version(psmouse);
 330         if (ret)
 331                 return ret;
 332
 333         ret = cypress_read_tp_metrics(psmouse);
 334         if (ret)
 335                 return ret;
 336
 337         return 0;
 338 }
 339
 340 static int cypress_set_absolute_mode(struct psmouse *psmouse)
 341 {
 342         struct cytp_data *cytp = psmouse->private;
 343         unsigned char param[3];
 344
 345         if (cypress_send_ext_cmd(psmouse, CYTP_CMD_ABS_WITH_PRESSURE_MODE, param) < 0)
 346                 return -1;
 347
 348         cytp->mode = (cytp->mode & ~CYTP_BIT_ABS_REL_MASK)
 349                         | CYTP_BIT_ABS_PRESSURE;
 350         cypress_set_packet_size(psmouse, 5);
 351
 352         return 0;
 353 }
 354
 355 /*
 356  * Reset trackpad device.
 357  * This is also the default mode when trackpad powered on.
 358  */
 359 static void cypress_reset(struct psmouse *psmouse)
 360 {
 361         struct cytp_data *cytp = psmouse->private;
 362
 363         cytp->mode = 0;
 364
 365         psmouse_reset(psmouse);
 366 }
 367
 368 static int cypress_set_input_params(struct input_dev *input,
 369                                     struct cytp_data *cytp)
 370 {
 371         int ret;
 372
 373         if (!cytp->tp_res_x || !cytp->tp_res_y)
 374                 return -EINVAL;
 375
 376         __set_bit(EV_ABS, input->evbit);
 377         input_set_abs_params(input, ABS_X, 0, cytp->tp_max_abs_x, 0, 0);
 378         input_set_abs_params(input, ABS_Y, 0, cytp->tp_max_abs_y, 0, 0);
 379         input_set_abs_params(input, ABS_PRESSURE,
 380                              cytp->tp_min_pressure, cytp->tp_max_pressure, 0, 0);
 381         input_set_abs_params(input, ABS_TOOL_WIDTH, 0, 255, 0, 0);
 382
 383         /* finger position */
 384         input_set_abs_params(input, ABS_MT_POSITION_X, 0, cytp->tp_max_abs_x, 0, 0);
 385         input_set_abs_params(input, ABS_MT_POSITION_Y, 0, cytp->tp_max_abs_y, 0, 0);
 386         input_set_abs_params(input, ABS_MT_PRESSURE, 0, 255, 0, 0);
 387
 388         ret = input_mt_init_slots(input, CYTP_MAX_MT_SLOTS,
 389                         INPUT_MT_DROP_UNUSED|INPUT_MT_TRACK);
 390         if (ret < 0)
 391                 return ret;
 392
 393 #if ( CYPRESS_SIMULATED_MT != 1 )
 394         __set_bit(INPUT_PROP_SEMI_MT, input->propbit);
 395 #endif
 396
 397         input_abs_set_res(input, ABS_X, cytp->tp_res_x);
 398         input_abs_set_res(input, ABS_Y, cytp->tp_res_y);
 399
 400         input_abs_set_res(input, ABS_MT_POSITION_X, cytp->tp_res_x);
 401         input_abs_set_res(input, ABS_MT_POSITION_Y, cytp->tp_res_y);
 402
 403         __set_bit(BTN_TOUCH, input->keybit);
 404         __set_bit(BTN_TOOL_FINGER, input->keybit);
 405         __set_bit(BTN_TOOL_DOUBLETAP, input->keybit);
 406         __set_bit(BTN_TOOL_TRIPLETAP, input->keybit);
 407         __set_bit(BTN_TOOL_QUADTAP, input->keybit);
 408         __set_bit(BTN_TOOL_QUINTTAP, input->keybit);
 409
 410         __clear_bit(EV_REL, input->evbit);
 411         __clear_bit(REL_X, input->relbit);
 412         __clear_bit(REL_Y, input->relbit);
 413
 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         return 0;
 420 }
 421
 422 static int cypress_get_finger_count(unsigned char header_byte)
 423 {
 424         unsigned char bits6_7;
 425         int finger_count;
 426
 427         bits6_7 = header_byte >> 6;
 428         finger_count = bits6_7 & 0x03;
 429
 430         if (finger_count == 1)
 431                 return 1;
 432
 433         if (header_byte & ABS_HSCROLL_BIT) {
 434                 /* HSCROLL gets added on to 0 finger count. */
 435                 switch (finger_count) {
 436                         case 0: return 4;
 437                         case 2: return 5;
 438                         default:
 439                                 /* Invalid contact (e.g. palm). Ignore it. */
 440                                 return 0;
 441                 }
 442         }
 443
 444         return finger_count;
 445 }
 446
 447
 448 static int cypress_parse_packet(struct psmouse *psmouse,
 449                                 struct cytp_data *cytp, struct cytp_report_data *report_data)
 450 {
 451         unsigned char *packet = psmouse->packet;
 452         unsigned char header_byte = packet[0];
 453
 454         memset(report_data, 0, sizeof(struct cytp_report_data));
 455
 456         report_data->contact_cnt = cypress_get_finger_count(header_byte);
 457         report_data->tap = (header_byte & ABS_MULTIFINGER_TAP) ? 1 : 0;
 458
 459         if (report_data->contact_cnt == 1) {
 460                 report_data->contacts[0].x =
 461                         ((packet[1] & 0x70) << 4) | packet[2];
 462                 report_data->contacts[0].y =
 463                         ((packet[1] & 0x07) << 8) | packet[3];
 464                 if (cytp->mode & CYTP_BIT_ABS_PRESSURE)
 465                         report_data->contacts[0].z = packet[4];
 466
 467         } else if (report_data->contact_cnt >= 2) {
 468                 report_data->contacts[0].x =
 469                         ((packet[1] & 0x70) << 4) | packet[2];
 470                 report_data->contacts[0].y =
 471                         ((packet[1] & 0x07) << 8) | packet[3];
 472                 if (cytp->mode & CYTP_BIT_ABS_PRESSURE)
 473                         report_data->contacts[0].z = packet[4];
 474
 475                 report_data->contacts[1].x =
 476                         ((packet[5] & 0xf0) << 4) | packet[6];
 477                 report_data->contacts[1].y =
 478                         ((packet[5] & 0x0f) << 8) | packet[7];
 479                 if (cytp->mode & CYTP_BIT_ABS_PRESSURE)
 480                         report_data->contacts[1].z = report_data->contacts[0].z;
 481 #if ( CYPRESS_SIMULATED_MT == 1 )
 482                 /* simulate contact positions for >2 fingers */
 483                 if ( report_data->contact_cnt >= 3 ) {
 484                         int i;
 485                         for ( i=1; i<report_data->contact_cnt; i++ ) {
 486                             report_data->contacts[i].x =
 487                                             report_data->contacts[0].x
 488                                             + 100*(i)*((i%2)?-1:1);
 489                             report_data->contacts[i].y =
 490                                             report_data->contacts[0].y;
 491                             if (cytp->mode & CYTP_BIT_ABS_PRESSURE)
 492                                     report_data->contacts[i].z =
 493                                             report_data->contacts[0].z;
 494                         }
 495                 }
 496 #endif
 497         }
 498
 499         report_data->left = (header_byte & BTN_LEFT_BIT) ? 1 : 0;
 500         report_data->right = (header_byte & BTN_RIGHT_BIT) ? 1 : 0;
 501
 502         /*
 503          * This is only true if one of the mouse buttons were tapped.  Make
 504          * sure it doesn't turn into a click. The regular tap-to-click
 505          * functionality will handle that on its own. If we don't do this,
 506          * disabling tap-to-click won't affect the mouse button zones.
 507          */
 508         if (report_data->tap)
 509                 report_data->left = 0;
 510
 511 #ifdef CYTP_DEBUG_VERBOSE
 512         {
 513                 int i;
 514                 int n = report_data->contact_cnt;
 515                 psmouse_dbg(psmouse, "Dump parsed report data as below:\n");
 516                 psmouse_dbg(psmouse, "contact_cnt = %d\n",
 517                         report_data->contact_cnt);
 518                 if (n > CYTP_MAX_MT_SLOTS)
 519                     n = CYTP_MAX_MT_SLOTS;
 520                 for (i = 0; i < n; i++)
 521                         psmouse_dbg(psmouse, "contacts[%d] = {%d, %d, %d}\n", i,
 522                                         report_data->contacts[i].x,
 523                                         report_data->contacts[i].y,
 524                                         report_data->contacts[i].z);
 525                 psmouse_dbg(psmouse, "left = %d\n", report_data->left);
 526                 psmouse_dbg(psmouse, "right = %d\n", report_data->right);
 527                 psmouse_dbg(psmouse, "middle = %d\n", report_data->middle);
 528         }
 529 #endif
 530
 531         return 0;
 532 }
 533
 534 static void cypress_process_packet(struct psmouse *psmouse, bool zero_pkt)
 535 {
 536         int i;
 537         struct input_dev *input = psmouse->dev;
 538         struct cytp_data *cytp = psmouse->private;
 539         struct cytp_report_data report_data;
 540         struct cytp_contact *contact;
 541         struct input_mt_pos pos[CYTP_MAX_MT_SLOTS];
 542         int slots[CYTP_MAX_MT_SLOTS];
 543         int n;
 544
 545         cypress_parse_packet(psmouse, cytp, &report_data);
 546
 547         n = report_data.contact_cnt;
 548         if (n > CYTP_MAX_MT_SLOTS)
 549                 n = CYTP_MAX_MT_SLOTS;
 550
 551         for (i = 0; i < n; i++) {
 552                 contact = &report_data.contacts[i];
 553                 pos[i].x = contact->x;
 554                 pos[i].y = contact->y;
 555         }
 556
 557         input_mt_assign_slots(input, slots, pos, n, 0);
 558
 559         for (i = 0; i < n; i++) {
 560                 contact = &report_data.contacts[i];
 561                 input_mt_slot(input, slots[i]);
 562                 input_mt_report_slot_state(input, MT_TOOL_FINGER, true);
 563                 input_report_abs(input, ABS_MT_POSITION_X, contact->x);
 564                 input_report_abs(input, ABS_MT_POSITION_Y, contact->y);
 565                 input_report_abs(input, ABS_MT_PRESSURE, contact->z);
 566         }
 567
 568         input_mt_sync_frame(input);
 569
 570         input_mt_report_finger_count(input, report_data.contact_cnt);
 571
 572         input_report_key(input, BTN_LEFT, report_data.left);
 573         input_report_key(input, BTN_RIGHT, report_data.right);
 574         input_report_key(input, BTN_MIDDLE, report_data.middle);
 575
 576         input_sync(input);
 577 }
 578
 579 static psmouse_ret_t cypress_validate_byte(struct psmouse *psmouse)
 580 {
 581         int contact_cnt;
 582         int index = psmouse->pktcnt - 1;
 583         unsigned char *packet = psmouse->packet;
 584         struct cytp_data *cytp = psmouse->private;
 585
 586         if (index < 0 || index > cytp->pkt_size)
 587                 return PSMOUSE_BAD_DATA;
 588
 589         if (index == 0 && (packet[0] & 0xfc) == 0) {
 590                 /* call packet process for reporting finger leave. */
 591                 cypress_process_packet(psmouse, 1);
 592                 return PSMOUSE_FULL_PACKET;
 593         }
 594
 595         /*
 596          * Perform validation (and adjust packet size) based only on the
 597          * first byte; allow all further bytes through.
 598          */
 599         if (index != 0)
 600                 return PSMOUSE_GOOD_DATA;
 601
 602         /*
 603          * If absolute/relative mode bit has not been set yet, just pass
 604          * the byte through.
 605          */
 606         if ((cytp->mode & CYTP_BIT_ABS_REL_MASK) == 0)
 607                 return PSMOUSE_GOOD_DATA;
 608
 609         if ((packet[0] & 0x08) == 0x08)
 610                 return PSMOUSE_BAD_DATA;
 611
 612         contact_cnt = cypress_get_finger_count(packet[0]);
 613         if (cytp->mode & CYTP_BIT_ABS_NO_PRESSURE)
 614                 cypress_set_packet_size(psmouse, contact_cnt == 2 ? 7 : 4);
 615         else
 616                 cypress_set_packet_size(psmouse, contact_cnt == 2 ? 8 : 5);
 617
 618         return PSMOUSE_GOOD_DATA;
 619 }
 620
 621 static psmouse_ret_t cypress_protocol_handler(struct psmouse *psmouse)
 622 {
 623         struct cytp_data *cytp = psmouse->private;
 624
 625         if (psmouse->pktcnt >= cytp->pkt_size) {
 626                 cypress_process_packet(psmouse, 0);
 627                 return PSMOUSE_FULL_PACKET;
 628         }
 629
 630         return cypress_validate_byte(psmouse);
 631 }
 632
 633 static void cypress_set_rate(struct psmouse *psmouse, unsigned int rate)
 634 {
 635         struct cytp_data *cytp = psmouse->private;
 636
 637         if (rate >= 80) {
 638                 psmouse->rate = 80;
 639                 cytp->mode |= CYTP_BIT_HIGH_RATE;
 640         } else {
 641                 psmouse->rate = 40;
 642                 cytp->mode &= ~CYTP_BIT_HIGH_RATE;
 643         }
 644
 645         ps2_command(&psmouse->ps2dev, (unsigned char *)&psmouse->rate,
 646                     PSMOUSE_CMD_SETRATE);
 647 }
 648
 649 static void cypress_disconnect(struct psmouse *psmouse)
 650 {
 651         cypress_reset(psmouse);
 652         kfree(psmouse->private);
 653         psmouse->private = NULL;
 654 }
 655
 656 static int cypress_reconnect(struct psmouse *psmouse)
 657 {
 658         int tries = CYTP_PS2_CMD_TRIES;
 659         int rc;
 660
 661         do {
 662                 cypress_reset(psmouse);
 663                 rc = cypress_detect(psmouse, false);
 664         } while (rc && (--tries > 0));
 665
 666         if (rc) {
 667                 psmouse_err(psmouse, "Reconnect: unable to detect trackpad.\n");
 668                 return -1;
 669         }
 670
 671         if (cypress_set_absolute_mode(psmouse)) {
 672                 psmouse_err(psmouse, "Reconnect: Unable to initialize Cypress absolute mode.\n");
 673                 return -1;
 674         }
 675
 676         return 0;
 677 }
 678
 679 int cypress_init(struct psmouse *psmouse)
 680 {
 681         struct cytp_data *cytp;
 682
 683         cytp = kzalloc(sizeof(struct cytp_data), GFP_KERNEL);
 684         if (!cytp)
 685                 return -ENOMEM;
 686
 687         psmouse->private = cytp;
 688         psmouse->pktsize = 8;
 689
 690         cypress_reset(psmouse);
 691
 692         if (cypress_query_hardware(psmouse)) {
 693                 psmouse_err(psmouse, "Unable to query Trackpad hardware.\n");
 694                 goto err_exit;
 695         }
 696
 697         if (cypress_set_absolute_mode(psmouse)) {
 698                 psmouse_err(psmouse, "init: Unable to initialize Cypress absolute mode.\n");
 699                 goto err_exit;
 700         }
 701
 702         if (cypress_set_input_params(psmouse->dev, cytp) < 0) {
 703                 psmouse_err(psmouse, "init: Unable to set input params.\n");
 704                 goto err_exit;
 705         }
 706
 707         psmouse->model = 1;
 708         psmouse->protocol_handler = cypress_protocol_handler;
 709         psmouse->set_rate = cypress_set_rate;
 710         psmouse->disconnect = cypress_disconnect;
 711         psmouse->reconnect = cypress_reconnect;
 712         psmouse->cleanup = cypress_reset;
 713         psmouse->resync_time = 0;
 714
 715         return 0;
 716
 717 err_exit:
 718         /*
 719          * Reset Cypress Trackpad as a standard mouse. Then
 720          * let psmouse driver commmunicating with it as default PS2 mouse.
 721          */
 722         cypress_reset(psmouse);
 723
 724         psmouse->private = NULL;
 725         kfree(cytp);
 726
 727         return -1;
 728 }