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 u8 cytp_rate[] = {10, 20, 40, 60, 100, 200};
  36 static const u8 cytp_resolution[] = {0x00, 0x01, 0x02, 0x03};
  37
  38 static int cypress_ps2_sendbyte(struct psmouse *psmouse, u8 cmd)
  39 {
  40         struct ps2dev *ps2dev = &psmouse->ps2dev;
  41         int error;
  42
  43         error = ps2_sendbyte(ps2dev, cmd, CYTP_CMD_TIMEOUT);
  44         if (error) {
  45                 psmouse_dbg(psmouse,
  46                             "sending command 0x%02x failed, resp 0x%02x, error %d\n",
  47                             cmd, ps2dev->nak, error);
  48                 return error;
  49         }
  50
  51 #ifdef CYTP_DEBUG_VERBOSE
  52         psmouse_dbg(psmouse, "sending command 0x%02x succeeded\n", cmd);
  53 #endif
  54
  55         return 0;
  56 }
  57
  58 static int cypress_ps2_ext_cmd(struct psmouse *psmouse, u8 prefix, u8 nibble)
  59 {
  60         struct ps2dev *ps2dev = &psmouse->ps2dev;
  61         int tries = CYTP_PS2_CMD_TRIES;
  62         int rc;
  63
  64         ps2_begin_command(ps2dev);
  65
  66         do {
  67                 /*
  68                  * Send extension command byte (0xE8 or 0xF3).
  69                  * If sending the command fails, send recovery command
  70                  * to make the device return to the ready state.
  71                  */
  72                 rc = cypress_ps2_sendbyte(psmouse, prefix);
  73                 if (rc == -EAGAIN) {
  74                         rc = cypress_ps2_sendbyte(psmouse, 0x00);
  75                         if (rc == -EAGAIN)
  76                                 rc = cypress_ps2_sendbyte(psmouse, 0x0a);
  77                 }
  78
  79                 if (!rc) {
  80                         rc = cypress_ps2_sendbyte(psmouse, nibble);
  81                         if (rc == -EAGAIN)
  82                                 rc = cypress_ps2_sendbyte(psmouse, nibble);
  83
  84                         if (!rc)
  85                                 break;
  86                 }
  87         } while (--tries > 0);
  88
  89         ps2_end_command(ps2dev);
  90
  91         return rc;
  92 }
  93
  94 static bool cypress_verify_cmd_state(struct psmouse *psmouse, u8 cmd, u8* param)
  95 {
  96         bool rate_match = false;
  97         bool resolution_match = false;
  98         int i;
  99
 100         /* callers will do further checking. */
 101         if (cmd == CYTP_CMD_READ_CYPRESS_ID ||
 102             cmd == CYTP_CMD_STANDARD_MODE ||
 103             cmd == CYTP_CMD_READ_TP_METRICS)
 104                 return true;
 105
 106         if ((~param[0] & DFLT_RESP_BITS_VALID) == DFLT_RESP_BITS_VALID &&
 107             (param[0] & DFLT_RESP_BIT_MODE) == DFLT_RESP_STREAM_MODE) {
 108                 for (i = 0; i < sizeof(cytp_resolution); i++)
 109                         if (cytp_resolution[i] == param[1])
 110                                 resolution_match = true;
 111
 112                 for (i = 0; i < sizeof(cytp_rate); i++)
 113                         if (cytp_rate[i] == param[2])
 114                                 rate_match = true;
 115
 116                 if (resolution_match && rate_match)
 117                         return true;
 118         }
 119
 120         psmouse_dbg(psmouse, "verify cmd state failed.\n");
 121         return false;
 122 }
 123
 124 static int cypress_send_ext_cmd(struct psmouse *psmouse, u8 cmd, u8 *param)
 125 {
 126         u8 cmd_prefix = PSMOUSE_CMD_SETRES & 0xff;
 127         unsigned int resp_size = cmd == CYTP_CMD_READ_TP_METRICS ? 8 : 3;
 128         unsigned int ps2_cmd = (PSMOUSE_CMD_GETINFO & 0xff) | (resp_size << 8);
 129         int tries = CYTP_PS2_CMD_TRIES;
 130         int error;
 131
 132         psmouse_dbg(psmouse, "send extension cmd 0x%02x, [%d %d %d %d]\n",
 133                  cmd, DECODE_CMD_AA(cmd), DECODE_CMD_BB(cmd),
 134                  DECODE_CMD_CC(cmd), DECODE_CMD_DD(cmd));
 135
 136         do {
 137                 cypress_ps2_ext_cmd(psmouse, cmd_prefix, DECODE_CMD_DD(cmd));
 138                 cypress_ps2_ext_cmd(psmouse, cmd_prefix, DECODE_CMD_CC(cmd));
 139                 cypress_ps2_ext_cmd(psmouse, cmd_prefix, DECODE_CMD_BB(cmd));
 140                 cypress_ps2_ext_cmd(psmouse, cmd_prefix, DECODE_CMD_AA(cmd));
 141
 142                 error = ps2_command(&psmouse->ps2dev, param, ps2_cmd);
 143                 if (error) {
 144                         psmouse_dbg(psmouse, "Command 0x%02x failed: %d\n",
 145                                     cmd, error);
 146                 } else {
 147                         psmouse_dbg(psmouse,
 148                                     "Command 0x%02x response data (0x): %*ph\n",
 149                                     cmd, resp_size, param);
 150
 151                         if (cypress_verify_cmd_state(psmouse, cmd, param))
 152                                 return 0;
 153                 }
 154         } while (--tries > 0);
 155
 156         return -EIO;
 157 }
 158
 159 int cypress_detect(struct psmouse *psmouse, bool set_properties)
 160 {
 161         u8 param[3];
 162
 163         if (cypress_send_ext_cmd(psmouse, CYTP_CMD_READ_CYPRESS_ID, param))
 164                 return -ENODEV;
 165
 166         /* Check for Cypress Trackpad signature bytes: 0x33 0xCC */
 167         if (param[0] != 0x33 || param[1] != 0xCC)
 168                 return -ENODEV;
 169
 170         if (set_properties) {
 171                 psmouse->vendor = "Cypress";
 172                 psmouse->name = "Trackpad";
 173         }
 174
 175         return 0;
 176 }
 177
 178 static int cypress_read_fw_version(struct psmouse *psmouse)
 179 {
 180         struct cytp_data *cytp = psmouse->private;
 181         u8 param[3];
 182
 183         if (cypress_send_ext_cmd(psmouse, CYTP_CMD_READ_CYPRESS_ID, param))
 184                 return -ENODEV;
 185
 186         /* Check for Cypress Trackpad signature bytes: 0x33 0xCC */
 187         if (param[0] != 0x33 || param[1] != 0xCC)
 188                 return -ENODEV;
 189
 190         cytp->fw_version = param[2] & FW_VERSION_MASX;
 191         cytp->tp_metrics_supported = (param[2] & TP_METRICS_MASK) ? 1 : 0;
 192
 193         /*
 194          * Trackpad fw_version 11 (in Dell XPS12) yields a bogus response to
 195          * CYTP_CMD_READ_TP_METRICS so do not try to use it. LP: #1103594.
 196          */
 197         if (cytp->fw_version >= 11)
 198                 cytp->tp_metrics_supported = 0;
 199
 200         psmouse_dbg(psmouse, "cytp->fw_version = %d\n", cytp->fw_version);
 201         psmouse_dbg(psmouse, "cytp->tp_metrics_supported = %d\n",
 202                  cytp->tp_metrics_supported);
 203
 204         return 0;
 205 }
 206
 207 static int cypress_read_tp_metrics(struct psmouse *psmouse)
 208 {
 209         struct cytp_data *cytp = psmouse->private;
 210         u8 param[8];
 211
 212         /* set default values for tp metrics. */
 213         cytp->tp_width = CYTP_DEFAULT_WIDTH;
 214         cytp->tp_high = CYTP_DEFAULT_HIGH;
 215         cytp->tp_max_abs_x = CYTP_ABS_MAX_X;
 216         cytp->tp_max_abs_y = CYTP_ABS_MAX_Y;
 217         cytp->tp_min_pressure = CYTP_MIN_PRESSURE;
 218         cytp->tp_max_pressure = CYTP_MAX_PRESSURE;
 219         cytp->tp_res_x = cytp->tp_max_abs_x / cytp->tp_width;
 220         cytp->tp_res_y = cytp->tp_max_abs_y / cytp->tp_high;
 221
 222         if (!cytp->tp_metrics_supported)
 223                 return 0;
 224
 225         memset(param, 0, sizeof(param));
 226         if (cypress_send_ext_cmd(psmouse, CYTP_CMD_READ_TP_METRICS, param) == 0) {
 227                 /* Update trackpad parameters. */
 228                 cytp->tp_max_abs_x = (param[1] << 8) | param[0];
 229                 cytp->tp_max_abs_y = (param[3] << 8) | param[2];
 230                 cytp->tp_min_pressure = param[4];
 231                 cytp->tp_max_pressure = param[5];
 232         }
 233
 234         if (!cytp->tp_max_pressure ||
 235             cytp->tp_max_pressure < cytp->tp_min_pressure ||
 236             !cytp->tp_width || !cytp->tp_high ||
 237             !cytp->tp_max_abs_x ||
 238             cytp->tp_max_abs_x < cytp->tp_width ||
 239             !cytp->tp_max_abs_y ||
 240             cytp->tp_max_abs_y < cytp->tp_high)
 241                 return -EINVAL;
 242
 243         cytp->tp_res_x = cytp->tp_max_abs_x / cytp->tp_width;
 244         cytp->tp_res_y = cytp->tp_max_abs_y / cytp->tp_high;
 245
 246 #ifdef CYTP_DEBUG_VERBOSE
 247         psmouse_dbg(psmouse, "Dump trackpad hardware configuration as below:\n");
 248         psmouse_dbg(psmouse, "cytp->tp_width = %d\n", cytp->tp_width);
 249         psmouse_dbg(psmouse, "cytp->tp_high = %d\n", cytp->tp_high);
 250         psmouse_dbg(psmouse, "cytp->tp_max_abs_x = %d\n", cytp->tp_max_abs_x);
 251         psmouse_dbg(psmouse, "cytp->tp_max_abs_y = %d\n", cytp->tp_max_abs_y);
 252         psmouse_dbg(psmouse, "cytp->tp_min_pressure = %d\n", cytp->tp_min_pressure);
 253         psmouse_dbg(psmouse, "cytp->tp_max_pressure = %d\n", cytp->tp_max_pressure);
 254         psmouse_dbg(psmouse, "cytp->tp_res_x = %d\n", cytp->tp_res_x);
 255         psmouse_dbg(psmouse, "cytp->tp_res_y = %d\n", cytp->tp_res_y);
 256
 257         psmouse_dbg(psmouse, "tp_type_APA = %d\n",
 258                         (param[6] & TP_METRICS_BIT_APA) ? 1 : 0);
 259         psmouse_dbg(psmouse, "tp_type_MTG = %d\n",
 260                         (param[6] & TP_METRICS_BIT_MTG) ? 1 : 0);
 261         psmouse_dbg(psmouse, "tp_palm = %d\n",
 262                         (param[6] & TP_METRICS_BIT_PALM) ? 1 : 0);
 263         psmouse_dbg(psmouse, "tp_stubborn = %d\n",
 264                         (param[6] & TP_METRICS_BIT_STUBBORN) ? 1 : 0);
 265         psmouse_dbg(psmouse, "tp_1f_jitter = %d\n",
 266                         (param[6] & TP_METRICS_BIT_1F_JITTER) >> 2);
 267         psmouse_dbg(psmouse, "tp_2f_jitter = %d\n",
 268                         (param[6] & TP_METRICS_BIT_2F_JITTER) >> 4);
 269         psmouse_dbg(psmouse, "tp_1f_spike = %d\n",
 270                         param[7] & TP_METRICS_BIT_1F_SPIKE);
 271         psmouse_dbg(psmouse, "tp_2f_spike = %d\n",
 272                         (param[7] & TP_METRICS_BIT_2F_SPIKE) >> 2);
 273         psmouse_dbg(psmouse, "tp_abs_packet_format_set = %d\n",
 274                         (param[7] & TP_METRICS_BIT_ABS_PKT_FORMAT_SET) >> 4);
 275 #endif
 276
 277         return 0;
 278 }
 279
 280 static int cypress_query_hardware(struct psmouse *psmouse)
 281 {
 282         int error;
 283
 284         error = cypress_read_fw_version(psmouse);
 285         if (error)
 286                 return error;
 287
 288         error = cypress_read_tp_metrics(psmouse);
 289         if (error)
 290                 return error;
 291
 292         return 0;
 293 }
 294
 295 static int cypress_set_absolute_mode(struct psmouse *psmouse)
 296 {
 297         struct cytp_data *cytp = psmouse->private;
 298         u8 param[3];
 299         int error;
 300
 301         error = cypress_send_ext_cmd(psmouse, CYTP_CMD_ABS_WITH_PRESSURE_MODE,
 302                                      param);
 303         if (error)
 304                 return error;
 305
 306         cytp->mode = (cytp->mode & ~CYTP_BIT_ABS_REL_MASK)
 307                         | CYTP_BIT_ABS_PRESSURE;
 308         cypress_set_packet_size(psmouse, 5);
 309
 310         return 0;
 311 }
 312
 313 /*
 314  * Reset trackpad device.
 315  * This is also the default mode when trackpad powered on.
 316  */
 317 static void cypress_reset(struct psmouse *psmouse)
 318 {
 319         struct cytp_data *cytp = psmouse->private;
 320
 321         cytp->mode = 0;
 322
 323         psmouse_reset(psmouse);
 324 }
 325
 326 static int cypress_set_input_params(struct input_dev *input,
 327                                     struct cytp_data *cytp)
 328 {
 329         int error;
 330
 331         if (!cytp->tp_res_x || !cytp->tp_res_y)
 332                 return -EINVAL;
 333
 334         __set_bit(EV_ABS, input->evbit);
 335         input_set_abs_params(input, ABS_X, 0, cytp->tp_max_abs_x, 0, 0);
 336         input_set_abs_params(input, ABS_Y, 0, cytp->tp_max_abs_y, 0, 0);
 337         input_set_abs_params(input, ABS_PRESSURE,
 338                              cytp->tp_min_pressure, cytp->tp_max_pressure, 0, 0);
 339         input_set_abs_params(input, ABS_TOOL_WIDTH, 0, 255, 0, 0);
 340
 341         /* finger position */
 342         input_set_abs_params(input, ABS_MT_POSITION_X, 0, cytp->tp_max_abs_x, 0, 0);
 343         input_set_abs_params(input, ABS_MT_POSITION_Y, 0, cytp->tp_max_abs_y, 0, 0);
 344         input_set_abs_params(input, ABS_MT_PRESSURE, 0, 255, 0, 0);
 345
 346         error = input_mt_init_slots(input, CYTP_MAX_MT_SLOTS,
 347                                     INPUT_MT_DROP_UNUSED | INPUT_MT_TRACK);
 348         if (error)
 349                 return error;
 350
 351         __set_bit(INPUT_PROP_SEMI_MT, input->propbit);
 352
 353         input_abs_set_res(input, ABS_X, cytp->tp_res_x);
 354         input_abs_set_res(input, ABS_Y, cytp->tp_res_y);
 355
 356         input_abs_set_res(input, ABS_MT_POSITION_X, cytp->tp_res_x);
 357         input_abs_set_res(input, ABS_MT_POSITION_Y, cytp->tp_res_y);
 358
 359         __set_bit(BTN_TOUCH, input->keybit);
 360         __set_bit(BTN_TOOL_FINGER, input->keybit);
 361         __set_bit(BTN_TOOL_DOUBLETAP, input->keybit);
 362         __set_bit(BTN_TOOL_TRIPLETAP, input->keybit);
 363         __set_bit(BTN_TOOL_QUADTAP, input->keybit);
 364         __set_bit(BTN_TOOL_QUINTTAP, input->keybit);
 365
 366         __clear_bit(EV_REL, input->evbit);
 367         __clear_bit(REL_X, input->relbit);
 368         __clear_bit(REL_Y, input->relbit);
 369
 370         __set_bit(EV_KEY, input->evbit);
 371         __set_bit(BTN_LEFT, input->keybit);
 372         __set_bit(BTN_RIGHT, input->keybit);
 373         __set_bit(BTN_MIDDLE, input->keybit);
 374
 375         return 0;
 376 }
 377
 378 static int cypress_get_finger_count(u8 header_byte)
 379 {
 380         u8 bits6_7;
 381         int finger_count;
 382
 383         bits6_7 = header_byte >> 6;
 384         finger_count = bits6_7 & 0x03;
 385
 386         if (finger_count == 1)
 387                 return 1;
 388
 389         if (header_byte & ABS_HSCROLL_BIT) {
 390                 /* HSCROLL gets added on to 0 finger count. */
 391                 switch (finger_count) {
 392                         case 0: return 4;
 393                         case 2: return 5;
 394                         default:
 395                                 /* Invalid contact (e.g. palm). Ignore it. */
 396                                 return 0;
 397                 }
 398         }
 399
 400         return finger_count;
 401 }
 402
 403
 404 static int cypress_parse_packet(struct psmouse *psmouse,
 405                                 struct cytp_data *cytp,
 406                                 struct cytp_report_data *report_data)
 407 {
 408         u8 *packet = psmouse->packet;
 409         u8 header_byte = packet[0];
 410
 411         memset(report_data, 0, sizeof(struct cytp_report_data));
 412
 413         report_data->contact_cnt = cypress_get_finger_count(header_byte);
 414         report_data->tap = (header_byte & ABS_MULTIFINGER_TAP) ? 1 : 0;
 415
 416         if (report_data->contact_cnt == 1) {
 417                 report_data->contacts[0].x =
 418                         ((packet[1] & 0x70) << 4) | packet[2];
 419                 report_data->contacts[0].y =
 420                         ((packet[1] & 0x07) << 8) | packet[3];
 421                 if (cytp->mode & CYTP_BIT_ABS_PRESSURE)
 422                         report_data->contacts[0].z = packet[4];
 423
 424         } else if (report_data->contact_cnt >= 2) {
 425                 report_data->contacts[0].x =
 426                         ((packet[1] & 0x70) << 4) | packet[2];
 427                 report_data->contacts[0].y =
 428                         ((packet[1] & 0x07) << 8) | packet[3];
 429                 if (cytp->mode & CYTP_BIT_ABS_PRESSURE)
 430                         report_data->contacts[0].z = packet[4];
 431
 432                 report_data->contacts[1].x =
 433                         ((packet[5] & 0xf0) << 4) | packet[6];
 434                 report_data->contacts[1].y =
 435                         ((packet[5] & 0x0f) << 8) | packet[7];
 436                 if (cytp->mode & CYTP_BIT_ABS_PRESSURE)
 437                         report_data->contacts[1].z = report_data->contacts[0].z;
 438         }
 439
 440         report_data->left = (header_byte & BTN_LEFT_BIT) ? 1 : 0;
 441         report_data->right = (header_byte & BTN_RIGHT_BIT) ? 1 : 0;
 442
 443         /*
 444          * This is only true if one of the mouse buttons were tapped.  Make
 445          * sure it doesn't turn into a click. The regular tap-to-click
 446          * functionality will handle that on its own. If we don't do this,
 447          * disabling tap-to-click won't affect the mouse button zones.
 448          */
 449         if (report_data->tap)
 450                 report_data->left = 0;
 451
 452 #ifdef CYTP_DEBUG_VERBOSE
 453         {
 454                 int i;
 455                 int n = report_data->contact_cnt;
 456                 psmouse_dbg(psmouse, "Dump parsed report data as below:\n");
 457                 psmouse_dbg(psmouse, "contact_cnt = %d\n",
 458                         report_data->contact_cnt);
 459                 if (n > CYTP_MAX_MT_SLOTS)
 460                     n = CYTP_MAX_MT_SLOTS;
 461                 for (i = 0; i < n; i++)
 462                         psmouse_dbg(psmouse, "contacts[%d] = {%d, %d, %d}\n", i,
 463                                         report_data->contacts[i].x,
 464                                         report_data->contacts[i].y,
 465                                         report_data->contacts[i].z);
 466                 psmouse_dbg(psmouse, "left = %d\n", report_data->left);
 467                 psmouse_dbg(psmouse, "right = %d\n", report_data->right);
 468                 psmouse_dbg(psmouse, "middle = %d\n", report_data->middle);
 469         }
 470 #endif
 471
 472         return 0;
 473 }
 474
 475 static void cypress_process_packet(struct psmouse *psmouse, bool zero_pkt)
 476 {
 477         int i;
 478         struct input_dev *input = psmouse->dev;
 479         struct cytp_data *cytp = psmouse->private;
 480         struct cytp_report_data report_data;
 481         struct cytp_contact *contact;
 482         struct input_mt_pos pos[CYTP_MAX_MT_SLOTS];
 483         int slots[CYTP_MAX_MT_SLOTS];
 484         int n;
 485
 486         cypress_parse_packet(psmouse, cytp, &report_data);
 487
 488         n = report_data.contact_cnt;
 489         if (n > CYTP_MAX_MT_SLOTS)
 490                 n = CYTP_MAX_MT_SLOTS;
 491
 492         for (i = 0; i < n; i++) {
 493                 contact = &report_data.contacts[i];
 494                 pos[i].x = contact->x;
 495                 pos[i].y = contact->y;
 496         }
 497
 498         input_mt_assign_slots(input, slots, pos, n, 0);
 499
 500         for (i = 0; i < n; i++) {
 501                 contact = &report_data.contacts[i];
 502                 input_mt_slot(input, slots[i]);
 503                 input_mt_report_slot_state(input, MT_TOOL_FINGER, true);
 504                 input_report_abs(input, ABS_MT_POSITION_X, contact->x);
 505                 input_report_abs(input, ABS_MT_POSITION_Y, contact->y);
 506                 input_report_abs(input, ABS_MT_PRESSURE, contact->z);
 507         }
 508
 509         input_mt_sync_frame(input);
 510
 511         input_mt_report_finger_count(input, report_data.contact_cnt);
 512
 513         input_report_key(input, BTN_LEFT, report_data.left);
 514         input_report_key(input, BTN_RIGHT, report_data.right);
 515         input_report_key(input, BTN_MIDDLE, report_data.middle);
 516
 517         input_sync(input);
 518 }
 519
 520 static psmouse_ret_t cypress_validate_byte(struct psmouse *psmouse)
 521 {
 522         int contact_cnt;
 523         int index = psmouse->pktcnt - 1;
 524         u8 *packet = psmouse->packet;
 525         struct cytp_data *cytp = psmouse->private;
 526
 527         if (index < 0 || index > cytp->pkt_size)
 528                 return PSMOUSE_BAD_DATA;
 529
 530         if (index == 0 && (packet[0] & 0xfc) == 0) {
 531                 /* call packet process for reporting finger leave. */
 532                 cypress_process_packet(psmouse, 1);
 533                 return PSMOUSE_FULL_PACKET;
 534         }
 535
 536         /*
 537          * Perform validation (and adjust packet size) based only on the
 538          * first byte; allow all further bytes through.
 539          */
 540         if (index != 0)
 541                 return PSMOUSE_GOOD_DATA;
 542
 543         /*
 544          * If absolute/relative mode bit has not been set yet, just pass
 545          * the byte through.
 546          */
 547         if ((cytp->mode & CYTP_BIT_ABS_REL_MASK) == 0)
 548                 return PSMOUSE_GOOD_DATA;
 549
 550         if ((packet[0] & 0x08) == 0x08)
 551                 return PSMOUSE_BAD_DATA;
 552
 553         contact_cnt = cypress_get_finger_count(packet[0]);
 554         if (cytp->mode & CYTP_BIT_ABS_NO_PRESSURE)
 555                 cypress_set_packet_size(psmouse, contact_cnt == 2 ? 7 : 4);
 556         else
 557                 cypress_set_packet_size(psmouse, contact_cnt == 2 ? 8 : 5);
 558
 559         return PSMOUSE_GOOD_DATA;
 560 }
 561
 562 static psmouse_ret_t cypress_protocol_handler(struct psmouse *psmouse)
 563 {
 564         struct cytp_data *cytp = psmouse->private;
 565
 566         if (psmouse->pktcnt >= cytp->pkt_size) {
 567                 cypress_process_packet(psmouse, 0);
 568                 return PSMOUSE_FULL_PACKET;
 569         }
 570
 571         return cypress_validate_byte(psmouse);
 572 }
 573
 574 static void cypress_set_rate(struct psmouse *psmouse, unsigned int rate)
 575 {
 576         struct cytp_data *cytp = psmouse->private;
 577         u8 rate_param;
 578
 579         if (rate >= 80) {
 580                 psmouse->rate = 80;
 581                 cytp->mode |= CYTP_BIT_HIGH_RATE;
 582         } else {
 583                 psmouse->rate = 40;
 584                 cytp->mode &= ~CYTP_BIT_HIGH_RATE;
 585         }
 586
 587         rate_param = (u8)rate;
 588         ps2_command(&psmouse->ps2dev, &rate_param, PSMOUSE_CMD_SETRATE);
 589 }
 590
 591 static void cypress_disconnect(struct psmouse *psmouse)
 592 {
 593         cypress_reset(psmouse);
 594         kfree(psmouse->private);
 595         psmouse->private = NULL;
 596 }
 597
 598 static int cypress_reconnect(struct psmouse *psmouse)
 599 {
 600         int tries = CYTP_PS2_CMD_TRIES;
 601         int error;
 602
 603         do {
 604                 cypress_reset(psmouse);
 605                 error = cypress_detect(psmouse, false);
 606         } while (error && (--tries > 0));
 607
 608         if (error) {
 609                 psmouse_err(psmouse, "Reconnect: unable to detect trackpad.\n");
 610                 return error;
 611         }
 612
 613         error = cypress_set_absolute_mode(psmouse);
 614         if (error) {
 615                 psmouse_err(psmouse, "Reconnect: Unable to initialize Cypress absolute mode.\n");
 616                 return error;
 617         }
 618
 619         return 0;
 620 }
 621
 622 int cypress_init(struct psmouse *psmouse)
 623 {
 624         struct cytp_data *cytp;
 625         int error;
 626
 627         cytp = kzalloc(sizeof(*cytp), GFP_KERNEL);
 628         if (!cytp)
 629                 return -ENOMEM;
 630
 631         psmouse->private = cytp;
 632         psmouse->pktsize = 8;
 633
 634         cypress_reset(psmouse);
 635
 636         error = cypress_query_hardware(psmouse);
 637         if (error) {
 638                 psmouse_err(psmouse, "Unable to query Trackpad hardware.\n");
 639                 goto err_exit;
 640         }
 641
 642         error = cypress_set_absolute_mode(psmouse);
 643         if (error) {
 644                 psmouse_err(psmouse, "init: Unable to initialize Cypress absolute mode.\n");
 645                 goto err_exit;
 646         }
 647
 648         error = cypress_set_input_params(psmouse->dev, cytp);
 649         if (error) {
 650                 psmouse_err(psmouse, "init: Unable to set input params.\n");
 651                 goto err_exit;
 652         }
 653
 654         psmouse->model = 1;
 655         psmouse->protocol_handler = cypress_protocol_handler;
 656         psmouse->set_rate = cypress_set_rate;
 657         psmouse->disconnect = cypress_disconnect;
 658         psmouse->reconnect = cypress_reconnect;
 659         psmouse->cleanup = cypress_reset;
 660         psmouse->resync_time = 0;
 661
 662         return 0;
 663
 664 err_exit:
 665         /*
 666          * Reset Cypress Trackpad as a standard mouse. Then
 667          * let psmouse driver communicating with it as default PS2 mouse.
 668          */
 669         cypress_reset(psmouse);
 670
 671         psmouse->private = NULL;
 672         kfree(cytp);
 673
 674         return error;
 675 }