drivers/input/mouse/cypress_ps2.c

   1 // SPDX-License-Identifier: GPL-2.0-only
   2 /*
   3  * Cypress Trackpad PS/2 mouse driver
   4  *
   5  * Copyright (c) 2012 Cypress Semiconductor Corporation.
   6  *
   7  * Author:
   8  *   Dudley Du <dudl@cypress.com>
   9  *
  10  * Additional contributors include:
  11  *   Kamal Mostafa <kamal@canonical.com>
  12  *   Kyle Fazzari <git@status.e4ward.com>
  13  */
  14
  15 #include <linux/module.h>
  16 #include <linux/kernel.h>
  17 #include <linux/slab.h>
  18 #include <linux/serio.h>
  19 #include <linux/libps2.h>
  20 #include <linux/input.h>
  21 #include <linux/input/mt.h>
  22 #include <linux/sched.h>
  23 #include <linux/wait.h>
  24
  25 #include "cypress_ps2.h"
  26
  27 #undef CYTP_DEBUG_VERBOSE  /* define this and DEBUG for more verbose dump */
  28
  29 static void cypress_set_packet_size(struct psmouse *psmouse, unsigned int n)
  30 {
  31         struct cytp_data *cytp = psmouse->private;
  32         cytp->pkt_size = n;
  33 }
  34
  35 static const unsigned char cytp_rate[] = {10, 20, 40, 60, 100, 200};
  36 static const unsigned char cytp_resolution[] = {0x00, 0x01, 0x02, 0x03};
  37
  38 static int cypress_ps2_sendbyte(struct psmouse *psmouse, int value)
  39 {
  40         struct ps2dev *ps2dev = &psmouse->ps2dev;
  41
  42         if (ps2_sendbyte(ps2dev, value & 0xff, CYTP_CMD_TIMEOUT) < 0) {
  43                 psmouse_dbg(psmouse,
  44                                 "sending command 0x%02x failed, resp 0x%02x\n",
  45                                 value & 0xff, ps2dev->nak);
  46                 if (ps2dev->nak == CYTP_PS2_RETRY)
  47                         return CYTP_PS2_RETRY;
  48                 else
  49                         return CYTP_PS2_ERROR;
  50         }
  51
  52 #ifdef CYTP_DEBUG_VERBOSE
  53         psmouse_dbg(psmouse, "sending command 0x%02x succeeded, resp 0xfa\n",
  54                         value & 0xff);
  55 #endif
  56
  57         return 0;
  58 }
  59
  60 static int cypress_ps2_ext_cmd(struct psmouse *psmouse, unsigned short cmd,
  61                                unsigned char data)
  62 {
  63         struct ps2dev *ps2dev = &psmouse->ps2dev;
  64         int tries = CYTP_PS2_CMD_TRIES;
  65         int rc;
  66
  67         ps2_begin_command(ps2dev);
  68
  69         do {
  70                 /*
  71                  * Send extension command byte (0xE8 or 0xF3).
  72                  * If sending the command fails, send recovery command
  73                  * to make the device return to the ready state.
  74                  */
  75                 rc = cypress_ps2_sendbyte(psmouse, cmd & 0xff);
  76                 if (rc == CYTP_PS2_RETRY) {
  77                         rc = cypress_ps2_sendbyte(psmouse, 0x00);
  78                         if (rc == CYTP_PS2_RETRY)
  79                                 rc = cypress_ps2_sendbyte(psmouse, 0x0a);
  80                 }
  81                 if (rc == CYTP_PS2_ERROR)
  82                         continue;
  83
  84                 rc = cypress_ps2_sendbyte(psmouse, data);
  85                 if (rc == CYTP_PS2_RETRY)
  86                         rc = cypress_ps2_sendbyte(psmouse, data);
  87                 if (rc == CYTP_PS2_ERROR)
  88                         continue;
  89                 else
  90                         break;
  91         } while (--tries > 0);
  92
  93         ps2_end_command(ps2dev);
  94
  95         return rc;
  96 }
  97
  98 static int cypress_ps2_read_cmd_status(struct psmouse *psmouse,
  99                                        unsigned char cmd,
 100                                        unsigned char *param)
 101 {
 102         int rc;
 103         struct ps2dev *ps2dev = &psmouse->ps2dev;
 104         enum psmouse_state old_state;
 105         int pktsize;
 106
 107         ps2_begin_command(ps2dev);
 108
 109         old_state = psmouse->state;
 110         psmouse->state = PSMOUSE_CMD_MODE;
 111         psmouse->pktcnt = 0;
 112
 113         pktsize = (cmd == CYTP_CMD_READ_TP_METRICS) ? 8 : 3;
 114         memset(param, 0, pktsize);
 115
 116         rc = cypress_ps2_sendbyte(psmouse, 0xe9);
 117         if (rc < 0)
 118                 goto out;
 119
 120         wait_event_timeout(ps2dev->wait,
 121                         (psmouse->pktcnt >= pktsize),
 122                         msecs_to_jiffies(CYTP_CMD_TIMEOUT));
 123
 124         memcpy(param, psmouse->packet, pktsize);
 125
 126         psmouse_dbg(psmouse, "Command 0x%02x response data (0x): %*ph\n",
 127                         cmd, pktsize, param);
 128
 129 out:
 130         psmouse->state = old_state;
 131         psmouse->pktcnt = 0;
 132
 133         ps2_end_command(ps2dev);
 134
 135         return rc;
 136 }
 137
 138 static bool cypress_verify_cmd_state(struct psmouse *psmouse,
 139                                      unsigned char cmd, unsigned char *param)
 140 {
 141         bool rate_match = false;
 142         bool resolution_match = false;
 143         int i;
 144
 145         /* callers will do further checking. */
 146         if (cmd == CYTP_CMD_READ_CYPRESS_ID ||
 147             cmd == CYTP_CMD_STANDARD_MODE ||
 148             cmd == CYTP_CMD_READ_TP_METRICS)
 149                 return true;
 150
 151         if ((~param[0] & DFLT_RESP_BITS_VALID) == DFLT_RESP_BITS_VALID &&
 152             (param[0] & DFLT_RESP_BIT_MODE) == DFLT_RESP_STREAM_MODE) {
 153                 for (i = 0; i < sizeof(cytp_resolution); i++)
 154                         if (cytp_resolution[i] == param[1])
 155                                 resolution_match = true;
 156
 157                 for (i = 0; i < sizeof(cytp_rate); i++)
 158                         if (cytp_rate[i] == param[2])
 159                                 rate_match = true;
 160
 161                 if (resolution_match && rate_match)
 162                         return true;
 163         }
 164
 165         psmouse_dbg(psmouse, "verify cmd state failed.\n");
 166         return false;
 167 }
 168
 169 static int cypress_send_ext_cmd(struct psmouse *psmouse, unsigned char cmd,
 170                                 unsigned char *param)
 171 {
 172         int tries = CYTP_PS2_CMD_TRIES;
 173         int rc;
 174
 175         psmouse_dbg(psmouse, "send extension cmd 0x%02x, [%d %d %d %d]\n",
 176                  cmd, DECODE_CMD_AA(cmd), DECODE_CMD_BB(cmd),
 177                  DECODE_CMD_CC(cmd), DECODE_CMD_DD(cmd));
 178
 179         do {
 180                 cypress_ps2_ext_cmd(psmouse,
 181                                     PSMOUSE_CMD_SETRES, DECODE_CMD_DD(cmd));
 182                 cypress_ps2_ext_cmd(psmouse,
 183                                     PSMOUSE_CMD_SETRES, DECODE_CMD_CC(cmd));
 184                 cypress_ps2_ext_cmd(psmouse,
 185                                     PSMOUSE_CMD_SETRES, DECODE_CMD_BB(cmd));
 186                 cypress_ps2_ext_cmd(psmouse,
 187                                     PSMOUSE_CMD_SETRES, DECODE_CMD_AA(cmd));
 188
 189                 rc = cypress_ps2_read_cmd_status(psmouse, cmd, param);
 190                 if (rc)
 191                         continue;
 192
 193                 if (cypress_verify_cmd_state(psmouse, cmd, param))
 194                         return 0;
 195
 196         } while (--tries > 0);
 197
 198         return -EIO;
 199 }
 200
 201 int cypress_detect(struct psmouse *psmouse, bool set_properties)
 202 {
 203         unsigned char param[3];
 204
 205         if (cypress_send_ext_cmd(psmouse, CYTP_CMD_READ_CYPRESS_ID, param))
 206                 return -ENODEV;
 207
 208         /* Check for Cypress Trackpad signature bytes: 0x33 0xCC */
 209         if (param[0] != 0x33 || param[1] != 0xCC)
 210                 return -ENODEV;
 211
 212         if (set_properties) {
 213                 psmouse->vendor = "Cypress";
 214                 psmouse->name = "Trackpad";
 215         }
 216
 217         return 0;
 218 }
 219
 220 static int cypress_read_fw_version(struct psmouse *psmouse)
 221 {
 222         struct cytp_data *cytp = psmouse->private;
 223         unsigned char param[3];
 224
 225         if (cypress_send_ext_cmd(psmouse, CYTP_CMD_READ_CYPRESS_ID, param))
 226                 return -ENODEV;
 227
 228         /* Check for Cypress Trackpad signature bytes: 0x33 0xCC */
 229         if (param[0] != 0x33 || param[1] != 0xCC)
 230                 return -ENODEV;
 231
 232         cytp->fw_version = param[2] & FW_VERSION_MASX;
 233         cytp->tp_metrics_supported = (param[2] & TP_METRICS_MASK) ? 1 : 0;
 234
 235         /*
 236          * Trackpad fw_version 11 (in Dell XPS12) yields a bogus response to
 237          * CYTP_CMD_READ_TP_METRICS so do not try to use it. LP: #1103594.
 238          */
 239         if (cytp->fw_version >= 11)
 240                 cytp->tp_metrics_supported = 0;
 241
 242         psmouse_dbg(psmouse, "cytp->fw_version = %d\n", cytp->fw_version);
 243         psmouse_dbg(psmouse, "cytp->tp_metrics_supported = %d\n",
 244                  cytp->tp_metrics_supported);
 245
 246         return 0;
 247 }
 248
 249 static int cypress_read_tp_metrics(struct psmouse *psmouse)
 250 {
 251         struct cytp_data *cytp = psmouse->private;
 252         unsigned char param[8];
 253
 254         /* set default values for tp metrics. */
 255         cytp->tp_width = CYTP_DEFAULT_WIDTH;
 256         cytp->tp_high = CYTP_DEFAULT_HIGH;
 257         cytp->tp_max_abs_x = CYTP_ABS_MAX_X;
 258         cytp->tp_max_abs_y = CYTP_ABS_MAX_Y;
 259         cytp->tp_min_pressure = CYTP_MIN_PRESSURE;
 260         cytp->tp_max_pressure = CYTP_MAX_PRESSURE;
 261         cytp->tp_res_x = cytp->tp_max_abs_x / cytp->tp_width;
 262         cytp->tp_res_y = cytp->tp_max_abs_y / cytp->tp_high;
 263
 264         if (!cytp->tp_metrics_supported)
 265                 return 0;
 266
 267         memset(param, 0, sizeof(param));
 268         if (cypress_send_ext_cmd(psmouse, CYTP_CMD_READ_TP_METRICS, param) == 0) {
 269                 /* Update trackpad parameters. */
 270                 cytp->tp_max_abs_x = (param[1] << 8) | param[0];
 271                 cytp->tp_max_abs_y = (param[3] << 8) | param[2];
 272                 cytp->tp_min_pressure = param[4];
 273                 cytp->tp_max_pressure = param[5];
 274         }
 275
 276         if (!cytp->tp_max_pressure ||
 277             cytp->tp_max_pressure < cytp->tp_min_pressure ||
 278             !cytp->tp_width || !cytp->tp_high ||
 279             !cytp->tp_max_abs_x ||
 280             cytp->tp_max_abs_x < cytp->tp_width ||
 281             !cytp->tp_max_abs_y ||
 282             cytp->tp_max_abs_y < cytp->tp_high)
 283                 return -EINVAL;
 284
 285         cytp->tp_res_x = cytp->tp_max_abs_x / cytp->tp_width;
 286         cytp->tp_res_y = cytp->tp_max_abs_y / cytp->tp_high;
 287
 288 #ifdef CYTP_DEBUG_VERBOSE
 289         psmouse_dbg(psmouse, "Dump trackpad hardware configuration as below:\n");
 290         psmouse_dbg(psmouse, "cytp->tp_width = %d\n", cytp->tp_width);
 291         psmouse_dbg(psmouse, "cytp->tp_high = %d\n", cytp->tp_high);
 292         psmouse_dbg(psmouse, "cytp->tp_max_abs_x = %d\n", cytp->tp_max_abs_x);
 293         psmouse_dbg(psmouse, "cytp->tp_max_abs_y = %d\n", cytp->tp_max_abs_y);
 294         psmouse_dbg(psmouse, "cytp->tp_min_pressure = %d\n", cytp->tp_min_pressure);
 295         psmouse_dbg(psmouse, "cytp->tp_max_pressure = %d\n", cytp->tp_max_pressure);
 296         psmouse_dbg(psmouse, "cytp->tp_res_x = %d\n", cytp->tp_res_x);
 297         psmouse_dbg(psmouse, "cytp->tp_res_y = %d\n", cytp->tp_res_y);
 298
 299         psmouse_dbg(psmouse, "tp_type_APA = %d\n",
 300                         (param[6] & TP_METRICS_BIT_APA) ? 1 : 0);
 301         psmouse_dbg(psmouse, "tp_type_MTG = %d\n",
 302                         (param[6] & TP_METRICS_BIT_MTG) ? 1 : 0);
 303         psmouse_dbg(psmouse, "tp_palm = %d\n",
 304                         (param[6] & TP_METRICS_BIT_PALM) ? 1 : 0);
 305         psmouse_dbg(psmouse, "tp_stubborn = %d\n",
 306                         (param[6] & TP_METRICS_BIT_STUBBORN) ? 1 : 0);
 307         psmouse_dbg(psmouse, "tp_1f_jitter = %d\n",
 308                         (param[6] & TP_METRICS_BIT_1F_JITTER) >> 2);
 309         psmouse_dbg(psmouse, "tp_2f_jitter = %d\n",
 310                         (param[6] & TP_METRICS_BIT_2F_JITTER) >> 4);
 311         psmouse_dbg(psmouse, "tp_1f_spike = %d\n",
 312                         param[7] & TP_METRICS_BIT_1F_SPIKE);
 313         psmouse_dbg(psmouse, "tp_2f_spike = %d\n",
 314                         (param[7] & TP_METRICS_BIT_2F_SPIKE) >> 2);
 315         psmouse_dbg(psmouse, "tp_abs_packet_format_set = %d\n",
 316                         (param[7] & TP_METRICS_BIT_ABS_PKT_FORMAT_SET) >> 4);
 317 #endif
 318
 319         return 0;
 320 }
 321
 322 static int cypress_query_hardware(struct psmouse *psmouse)
 323 {
 324         int ret;
 325
 326         ret = cypress_read_fw_version(psmouse);
 327         if (ret)
 328                 return ret;
 329
 330         ret = cypress_read_tp_metrics(psmouse);
 331         if (ret)
 332                 return ret;
 333
 334         return 0;
 335 }
 336
 337 static int cypress_set_absolute_mode(struct psmouse *psmouse)
 338 {
 339         struct cytp_data *cytp = psmouse->private;
 340         unsigned char param[3];
 341
 342         if (cypress_send_ext_cmd(psmouse, CYTP_CMD_ABS_WITH_PRESSURE_MODE, param) < 0)
 343                 return -1;
 344
 345         cytp->mode = (cytp->mode & ~CYTP_BIT_ABS_REL_MASK)
 346                         | CYTP_BIT_ABS_PRESSURE;
 347         cypress_set_packet_size(psmouse, 5);
 348
 349         return 0;
 350 }
 351
 352 /*
 353  * Reset trackpad device.
 354  * This is also the default mode when trackpad powered on.
 355  */
 356 static void cypress_reset(struct psmouse *psmouse)
 357 {
 358         struct cytp_data *cytp = psmouse->private;
 359
 360         cytp->mode = 0;
 361
 362         psmouse_reset(psmouse);
 363 }
 364
 365 static int cypress_set_input_params(struct input_dev *input,
 366                                     struct cytp_data *cytp)
 367 {
 368         int ret;
 369
 370         if (!cytp->tp_res_x || !cytp->tp_res_y)
 371                 return -EINVAL;
 372
 373         __set_bit(EV_ABS, input->evbit);
 374         input_set_abs_params(input, ABS_X, 0, cytp->tp_max_abs_x, 0, 0);
 375         input_set_abs_params(input, ABS_Y, 0, cytp->tp_max_abs_y, 0, 0);
 376         input_set_abs_params(input, ABS_PRESSURE,
 377                              cytp->tp_min_pressure, cytp->tp_max_pressure, 0, 0);
 378         input_set_abs_params(input, ABS_TOOL_WIDTH, 0, 255, 0, 0);
 379
 380         /* finger position */
 381         input_set_abs_params(input, ABS_MT_POSITION_X, 0, cytp->tp_max_abs_x, 0, 0);
 382         input_set_abs_params(input, ABS_MT_POSITION_Y, 0, cytp->tp_max_abs_y, 0, 0);
 383         input_set_abs_params(input, ABS_MT_PRESSURE, 0, 255, 0, 0);
 384
 385         ret = input_mt_init_slots(input, CYTP_MAX_MT_SLOTS,
 386                         INPUT_MT_DROP_UNUSED|INPUT_MT_TRACK);
 387         if (ret < 0)
 388                 return ret;
 389
 390         __set_bit(INPUT_PROP_SEMI_MT, input->propbit);
 391
 392         input_abs_set_res(input, ABS_X, cytp->tp_res_x);
 393         input_abs_set_res(input, ABS_Y, cytp->tp_res_y);
 394
 395         input_abs_set_res(input, ABS_MT_POSITION_X, cytp->tp_res_x);
 396         input_abs_set_res(input, ABS_MT_POSITION_Y, cytp->tp_res_y);
 397
 398         __set_bit(BTN_TOUCH, input->keybit);
 399         __set_bit(BTN_TOOL_FINGER, input->keybit);
 400         __set_bit(BTN_TOOL_DOUBLETAP, input->keybit);
 401         __set_bit(BTN_TOOL_TRIPLETAP, input->keybit);
 402         __set_bit(BTN_TOOL_QUADTAP, input->keybit);
 403         __set_bit(BTN_TOOL_QUINTTAP, input->keybit);
 404
 405         __clear_bit(EV_REL, input->evbit);
 406         __clear_bit(REL_X, input->relbit);
 407         __clear_bit(REL_Y, input->relbit);
 408
 409         __set_bit(EV_KEY, input->evbit);
 410         __set_bit(BTN_LEFT, input->keybit);
 411         __set_bit(BTN_RIGHT, input->keybit);
 412         __set_bit(BTN_MIDDLE, input->keybit);
 413
 414         return 0;
 415 }
 416
 417 static int cypress_get_finger_count(unsigned char header_byte)
 418 {
 419         unsigned char bits6_7;
 420         int finger_count;
 421
 422         bits6_7 = header_byte >> 6;
 423         finger_count = bits6_7 & 0x03;
 424
 425         if (finger_count == 1)
 426                 return 1;
 427
 428         if (header_byte & ABS_HSCROLL_BIT) {
 429                 /* HSCROLL gets added on to 0 finger count. */
 430                 switch (finger_count) {
 431                         case 0: return 4;
 432                         case 2: return 5;
 433                         default:
 434                                 /* Invalid contact (e.g. palm). Ignore it. */
 435                                 return 0;
 436                 }
 437         }
 438
 439         return finger_count;
 440 }
 441
 442
 443 static int cypress_parse_packet(struct psmouse *psmouse,
 444                                 struct cytp_data *cytp, struct cytp_report_data *report_data)
 445 {
 446         unsigned char *packet = psmouse->packet;
 447         unsigned char header_byte = packet[0];
 448
 449         memset(report_data, 0, sizeof(struct cytp_report_data));
 450
 451         report_data->contact_cnt = cypress_get_finger_count(header_byte);
 452         report_data->tap = (header_byte & ABS_MULTIFINGER_TAP) ? 1 : 0;
 453
 454         if (report_data->contact_cnt == 1) {
 455                 report_data->contacts[0].x =
 456                         ((packet[1] & 0x70) << 4) | packet[2];
 457                 report_data->contacts[0].y =
 458                         ((packet[1] & 0x07) << 8) | packet[3];
 459                 if (cytp->mode & CYTP_BIT_ABS_PRESSURE)
 460                         report_data->contacts[0].z = packet[4];
 461
 462         } else if (report_data->contact_cnt >= 2) {
 463                 report_data->contacts[0].x =
 464                         ((packet[1] & 0x70) << 4) | packet[2];
 465                 report_data->contacts[0].y =
 466                         ((packet[1] & 0x07) << 8) | packet[3];
 467                 if (cytp->mode & CYTP_BIT_ABS_PRESSURE)
 468                         report_data->contacts[0].z = packet[4];
 469
 470                 report_data->contacts[1].x =
 471                         ((packet[5] & 0xf0) << 4) | packet[6];
 472                 report_data->contacts[1].y =
 473                         ((packet[5] & 0x0f) << 8) | packet[7];
 474                 if (cytp->mode & CYTP_BIT_ABS_PRESSURE)
 475                         report_data->contacts[1].z = report_data->contacts[0].z;
 476         }
 477
 478         report_data->left = (header_byte & BTN_LEFT_BIT) ? 1 : 0;
 479         report_data->right = (header_byte & BTN_RIGHT_BIT) ? 1 : 0;
 480
 481         /*
 482          * This is only true if one of the mouse buttons were tapped.  Make
 483          * sure it doesn't turn into a click. The regular tap-to-click
 484          * functionality will handle that on its own. If we don't do this,
 485          * disabling tap-to-click won't affect the mouse button zones.
 486          */
 487         if (report_data->tap)
 488                 report_data->left = 0;
 489
 490 #ifdef CYTP_DEBUG_VERBOSE
 491         {
 492                 int i;
 493                 int n = report_data->contact_cnt;
 494                 psmouse_dbg(psmouse, "Dump parsed report data as below:\n");
 495                 psmouse_dbg(psmouse, "contact_cnt = %d\n",
 496                         report_data->contact_cnt);
 497                 if (n > CYTP_MAX_MT_SLOTS)
 498                     n = CYTP_MAX_MT_SLOTS;
 499                 for (i = 0; i < n; i++)
 500                         psmouse_dbg(psmouse, "contacts[%d] = {%d, %d, %d}\n", i,
 501                                         report_data->contacts[i].x,
 502                                         report_data->contacts[i].y,
 503                                         report_data->contacts[i].z);
 504                 psmouse_dbg(psmouse, "left = %d\n", report_data->left);
 505                 psmouse_dbg(psmouse, "right = %d\n", report_data->right);
 506                 psmouse_dbg(psmouse, "middle = %d\n", report_data->middle);
 507         }
 508 #endif
 509
 510         return 0;
 511 }
 512
 513 static void cypress_process_packet(struct psmouse *psmouse, bool zero_pkt)
 514 {
 515         int i;
 516         struct input_dev *input = psmouse->dev;
 517         struct cytp_data *cytp = psmouse->private;
 518         struct cytp_report_data report_data;
 519         struct cytp_contact *contact;
 520         struct input_mt_pos pos[CYTP_MAX_MT_SLOTS];
 521         int slots[CYTP_MAX_MT_SLOTS];
 522         int n;
 523
 524         cypress_parse_packet(psmouse, cytp, &report_data);
 525
 526         n = report_data.contact_cnt;
 527         if (n > CYTP_MAX_MT_SLOTS)
 528                 n = CYTP_MAX_MT_SLOTS;
 529
 530         for (i = 0; i < n; i++) {
 531                 contact = &report_data.contacts[i];
 532                 pos[i].x = contact->x;
 533                 pos[i].y = contact->y;
 534         }
 535
 536         input_mt_assign_slots(input, slots, pos, n, 0);
 537
 538         for (i = 0; i < n; i++) {
 539                 contact = &report_data.contacts[i];
 540                 input_mt_slot(input, slots[i]);
 541                 input_mt_report_slot_state(input, MT_TOOL_FINGER, true);
 542                 input_report_abs(input, ABS_MT_POSITION_X, contact->x);
 543                 input_report_abs(input, ABS_MT_POSITION_Y, contact->y);
 544                 input_report_abs(input, ABS_MT_PRESSURE, contact->z);
 545         }
 546
 547         input_mt_sync_frame(input);
 548
 549         input_mt_report_finger_count(input, report_data.contact_cnt);
 550
 551         input_report_key(input, BTN_LEFT, report_data.left);
 552         input_report_key(input, BTN_RIGHT, report_data.right);
 553         input_report_key(input, BTN_MIDDLE, report_data.middle);
 554
 555         input_sync(input);
 556 }
 557
 558 static psmouse_ret_t cypress_validate_byte(struct psmouse *psmouse)
 559 {
 560         int contact_cnt;
 561         int index = psmouse->pktcnt - 1;
 562         unsigned char *packet = psmouse->packet;
 563         struct cytp_data *cytp = psmouse->private;
 564
 565         if (index < 0 || index > cytp->pkt_size)
 566                 return PSMOUSE_BAD_DATA;
 567
 568         if (index == 0 && (packet[0] & 0xfc) == 0) {
 569                 /* call packet process for reporting finger leave. */
 570                 cypress_process_packet(psmouse, 1);
 571                 return PSMOUSE_FULL_PACKET;
 572         }
 573
 574         /*
 575          * Perform validation (and adjust packet size) based only on the
 576          * first byte; allow all further bytes through.
 577          */
 578         if (index != 0)
 579                 return PSMOUSE_GOOD_DATA;
 580
 581         /*
 582          * If absolute/relative mode bit has not been set yet, just pass
 583          * the byte through.
 584          */
 585         if ((cytp->mode & CYTP_BIT_ABS_REL_MASK) == 0)
 586                 return PSMOUSE_GOOD_DATA;
 587
 588         if ((packet[0] & 0x08) == 0x08)
 589                 return PSMOUSE_BAD_DATA;
 590
 591         contact_cnt = cypress_get_finger_count(packet[0]);
 592         if (cytp->mode & CYTP_BIT_ABS_NO_PRESSURE)
 593                 cypress_set_packet_size(psmouse, contact_cnt == 2 ? 7 : 4);
 594         else
 595                 cypress_set_packet_size(psmouse, contact_cnt == 2 ? 8 : 5);
 596
 597         return PSMOUSE_GOOD_DATA;
 598 }
 599
 600 static psmouse_ret_t cypress_protocol_handler(struct psmouse *psmouse)
 601 {
 602         struct cytp_data *cytp = psmouse->private;
 603
 604         if (psmouse->pktcnt >= cytp->pkt_size) {
 605                 cypress_process_packet(psmouse, 0);
 606                 return PSMOUSE_FULL_PACKET;
 607         }
 608
 609         return cypress_validate_byte(psmouse);
 610 }
 611
 612 static void cypress_set_rate(struct psmouse *psmouse, unsigned int rate)
 613 {
 614         struct cytp_data *cytp = psmouse->private;
 615
 616         if (rate >= 80) {
 617                 psmouse->rate = 80;
 618                 cytp->mode |= CYTP_BIT_HIGH_RATE;
 619         } else {
 620                 psmouse->rate = 40;
 621                 cytp->mode &= ~CYTP_BIT_HIGH_RATE;
 622         }
 623
 624         ps2_command(&psmouse->ps2dev, (unsigned char *)&psmouse->rate,
 625                     PSMOUSE_CMD_SETRATE);
 626 }
 627
 628 static void cypress_disconnect(struct psmouse *psmouse)
 629 {
 630         cypress_reset(psmouse);
 631         kfree(psmouse->private);
 632         psmouse->private = NULL;
 633 }
 634
 635 static int cypress_reconnect(struct psmouse *psmouse)
 636 {
 637         int tries = CYTP_PS2_CMD_TRIES;
 638         int rc;
 639
 640         do {
 641                 cypress_reset(psmouse);
 642                 rc = cypress_detect(psmouse, false);
 643         } while (rc && (--tries > 0));
 644
 645         if (rc) {
 646                 psmouse_err(psmouse, "Reconnect: unable to detect trackpad.\n");
 647                 return -1;
 648         }
 649
 650         if (cypress_set_absolute_mode(psmouse)) {
 651                 psmouse_err(psmouse, "Reconnect: Unable to initialize Cypress absolute mode.\n");
 652                 return -1;
 653         }
 654
 655         return 0;
 656 }
 657
 658 int cypress_init(struct psmouse *psmouse)
 659 {
 660         struct cytp_data *cytp;
 661
 662         cytp = kzalloc(sizeof(struct cytp_data), GFP_KERNEL);
 663         if (!cytp)
 664                 return -ENOMEM;
 665
 666         psmouse->private = cytp;
 667         psmouse->pktsize = 8;
 668
 669         cypress_reset(psmouse);
 670
 671         if (cypress_query_hardware(psmouse)) {
 672                 psmouse_err(psmouse, "Unable to query Trackpad hardware.\n");
 673                 goto err_exit;
 674         }
 675
 676         if (cypress_set_absolute_mode(psmouse)) {
 677                 psmouse_err(psmouse, "init: Unable to initialize Cypress absolute mode.\n");
 678                 goto err_exit;
 679         }
 680
 681         if (cypress_set_input_params(psmouse->dev, cytp) < 0) {
 682                 psmouse_err(psmouse, "init: Unable to set input params.\n");
 683                 goto err_exit;
 684         }
 685
 686         psmouse->model = 1;
 687         psmouse->protocol_handler = cypress_protocol_handler;
 688         psmouse->set_rate = cypress_set_rate;
 689         psmouse->disconnect = cypress_disconnect;
 690         psmouse->reconnect = cypress_reconnect;
 691         psmouse->cleanup = cypress_reset;
 692         psmouse->resync_time = 0;
 693
 694         return 0;
 695
 696 err_exit:
 697         /*
 698          * Reset Cypress Trackpad as a standard mouse. Then
 699          * let psmouse driver commmunicating with it as default PS2 mouse.
 700          */
 701         cypress_reset(psmouse);
 702
 703         psmouse->private = NULL;
 704         kfree(cytp);
 705
 706         return -1;
 707 }