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 <[email protected]>
   9  *
  10  * Additional contributors include:
  11  *   Kamal Mostafa <[email protected]>
  12  *   Kyle Fazzari <[email protected]>
  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 int cypress_ps2_read_cmd_status(struct psmouse *psmouse,
  95                                        u8 cmd, u8 *param)
  96 {
  97         struct ps2dev *ps2dev = &psmouse->ps2dev;
  98         enum psmouse_state old_state;
  99         int pktsize;
 100         int rc;
 101
 102         ps2_begin_command(ps2dev);
 103
 104         old_state = psmouse->state;
 105         psmouse->state = PSMOUSE_CMD_MODE;
 106         psmouse->pktcnt = 0;
 107
 108         pktsize = (cmd == CYTP_CMD_READ_TP_METRICS) ? 8 : 3;
 109         memset(param, 0, pktsize);
 110
 111         rc = cypress_ps2_sendbyte(psmouse, PSMOUSE_CMD_GETINFO & 0xff);
 112         if (rc)
 113                 goto out;
 114
 115         if (!wait_event_timeout(ps2dev->wait,
 116                                 psmouse->pktcnt >= pktsize,
 117                                 msecs_to_jiffies(CYTP_CMD_TIMEOUT))) {
 118                 rc = -ETIMEDOUT;
 119                 goto out;
 120         }
 121
 122         memcpy(param, psmouse->packet, pktsize);
 123
 124         psmouse_dbg(psmouse, "Command 0x%02x response data (0x): %*ph\n",
 125                         cmd, pktsize, param);
 126
 127 out:
 128         psmouse->state = old_state;
 129         psmouse->pktcnt = 0;
 130
 131         ps2_end_command(ps2dev);
 132
 133         return rc;
 134 }
 135
 136 static bool cypress_verify_cmd_state(struct psmouse *psmouse, u8 cmd, u8* param)
 137 {
 138         bool rate_match = false;
 139         bool resolution_match = false;
 140         int i;
 141
 142         /* callers will do further checking. */
 143         if (cmd == CYTP_CMD_READ_CYPRESS_ID ||
 144             cmd == CYTP_CMD_STANDARD_MODE ||
 145             cmd == CYTP_CMD_READ_TP_METRICS)
 146                 return true;
 147
 148         if ((~param[0] & DFLT_RESP_BITS_VALID) == DFLT_RESP_BITS_VALID &&
 149             (param[0] & DFLT_RESP_BIT_MODE) == DFLT_RESP_STREAM_MODE) {
 150                 for (i = 0; i < sizeof(cytp_resolution); i++)
 151                         if (cytp_resolution[i] == param[1])
 152                                 resolution_match = true;
 153
 154                 for (i = 0; i < sizeof(cytp_rate); i++)
 155                         if (cytp_rate[i] == param[2])
 156                                 rate_match = true;
 157
 158                 if (resolution_match && rate_match)
 159                         return true;
 160         }
 161
 162         psmouse_dbg(psmouse, "verify cmd state failed.\n");
 163         return false;
 164 }
 165
 166 static int cypress_send_ext_cmd(struct psmouse *psmouse, u8 cmd, u8 *param)
 167 {
 168         u8 cmd_prefix = PSMOUSE_CMD_SETRES & 0xff;
 169         int tries = CYTP_PS2_CMD_TRIES;
 170         int error;
 171
 172         psmouse_dbg(psmouse, "send extension cmd 0x%02x, [%d %d %d %d]\n",
 173                  cmd, DECODE_CMD_AA(cmd), DECODE_CMD_BB(cmd),
 174                  DECODE_CMD_CC(cmd), DECODE_CMD_DD(cmd));
 175
 176         do {
 177                 cypress_ps2_ext_cmd(psmouse, cmd_prefix, DECODE_CMD_DD(cmd));
 178                 cypress_ps2_ext_cmd(psmouse, cmd_prefix, DECODE_CMD_CC(cmd));
 179                 cypress_ps2_ext_cmd(psmouse, cmd_prefix, DECODE_CMD_BB(cmd));
 180                 cypress_ps2_ext_cmd(psmouse, cmd_prefix, DECODE_CMD_AA(cmd));
 181
 182                 error = cypress_ps2_read_cmd_status(psmouse, cmd, param);
 183                 if (!error && cypress_verify_cmd_state(psmouse, cmd, param))
 184                         return 0;
 185
 186         } while (--tries > 0);
 187
 188         return -EIO;
 189 }
 190
 191 int cypress_detect(struct psmouse *psmouse, bool set_properties)
 192 {
 193         u8 param[3];
 194
 195         if (cypress_send_ext_cmd(psmouse, CYTP_CMD_READ_CYPRESS_ID, param))
 196                 return -ENODEV;
 197
 198         /* Check for Cypress Trackpad signature bytes: 0x33 0xCC */
 199         if (param[0] != 0x33 || param[1] != 0xCC)
 200                 return -ENODEV;
 201
 202         if (set_properties) {
 203                 psmouse->vendor = "Cypress";
 204                 psmouse->name = "Trackpad";
 205         }
 206
 207         return 0;
 208 }
 209
 210 static int cypress_read_fw_version(struct psmouse *psmouse)
 211 {
 212         struct cytp_data *cytp = psmouse->private;
 213         u8 param[3];
 214
 215         if (cypress_send_ext_cmd(psmouse, CYTP_CMD_READ_CYPRESS_ID, param))
 216                 return -ENODEV;
 217
 218         /* Check for Cypress Trackpad signature bytes: 0x33 0xCC */
 219         if (param[0] != 0x33 || param[1] != 0xCC)
 220                 return -ENODEV;
 221
 222         cytp->fw_version = param[2] & FW_VERSION_MASX;
 223         cytp->tp_metrics_supported = (param[2] & TP_METRICS_MASK) ? 1 : 0;
 224
 225         /*
 226          * Trackpad fw_version 11 (in Dell XPS12) yields a bogus response to
 227          * CYTP_CMD_READ_TP_METRICS so do not try to use it. LP: #1103594.
 228          */
 229         if (cytp->fw_version >= 11)
 230                 cytp->tp_metrics_supported = 0;
 231
 232         psmouse_dbg(psmouse, "cytp->fw_version = %d\n", cytp->fw_version);
 233         psmouse_dbg(psmouse, "cytp->tp_metrics_supported = %d\n",
 234                  cytp->tp_metrics_supported);
 235
 236         return 0;
 237 }
 238
 239 static int cypress_read_tp_metrics(struct psmouse *psmouse)
 240 {
 241         struct cytp_data *cytp = psmouse->private;
 242         u8 param[8];
 243
 244         /* set default values for tp metrics. */
 245         cytp->tp_width = CYTP_DEFAULT_WIDTH;
 246         cytp->tp_high = CYTP_DEFAULT_HIGH;
 247         cytp->tp_max_abs_x = CYTP_ABS_MAX_X;
 248         cytp->tp_max_abs_y = CYTP_ABS_MAX_Y;
 249         cytp->tp_min_pressure = CYTP_MIN_PRESSURE;
 250         cytp->tp_max_pressure = CYTP_MAX_PRESSURE;
 251         cytp->tp_res_x = cytp->tp_max_abs_x / cytp->tp_width;
 252         cytp->tp_res_y = cytp->tp_max_abs_y / cytp->tp_high;
 253
 254         if (!cytp->tp_metrics_supported)
 255                 return 0;
 256
 257         memset(param, 0, sizeof(param));
 258         if (cypress_send_ext_cmd(psmouse, CYTP_CMD_READ_TP_METRICS, param) == 0) {
 259                 /* Update trackpad parameters. */
 260                 cytp->tp_max_abs_x = (param[1] << 8) | param[0];
 261                 cytp->tp_max_abs_y = (param[3] << 8) | param[2];
 262                 cytp->tp_min_pressure = param[4];
 263                 cytp->tp_max_pressure = param[5];
 264         }
 265
 266         if (!cytp->tp_max_pressure ||
 267             cytp->tp_max_pressure < cytp->tp_min_pressure ||
 268             !cytp->tp_width || !cytp->tp_high ||
 269             !cytp->tp_max_abs_x ||
 270             cytp->tp_max_abs_x < cytp->tp_width ||
 271             !cytp->tp_max_abs_y ||
 272             cytp->tp_max_abs_y < cytp->tp_high)
 273                 return -EINVAL;
 274
 275         cytp->tp_res_x = cytp->tp_max_abs_x / cytp->tp_width;
 276         cytp->tp_res_y = cytp->tp_max_abs_y / cytp->tp_high;
 277
 278 #ifdef CYTP_DEBUG_VERBOSE
 279         psmouse_dbg(psmouse, "Dump trackpad hardware configuration as below:\n");
 280         psmouse_dbg(psmouse, "cytp->tp_width = %d\n", cytp->tp_width);
 281         psmouse_dbg(psmouse, "cytp->tp_high = %d\n", cytp->tp_high);
 282         psmouse_dbg(psmouse, "cytp->tp_max_abs_x = %d\n", cytp->tp_max_abs_x);
 283         psmouse_dbg(psmouse, "cytp->tp_max_abs_y = %d\n", cytp->tp_max_abs_y);
 284         psmouse_dbg(psmouse, "cytp->tp_min_pressure = %d\n", cytp->tp_min_pressure);
 285         psmouse_dbg(psmouse, "cytp->tp_max_pressure = %d\n", cytp->tp_max_pressure);
 286         psmouse_dbg(psmouse, "cytp->tp_res_x = %d\n", cytp->tp_res_x);
 287         psmouse_dbg(psmouse, "cytp->tp_res_y = %d\n", cytp->tp_res_y);
 288
 289         psmouse_dbg(psmouse, "tp_type_APA = %d\n",
 290                         (param[6] & TP_METRICS_BIT_APA) ? 1 : 0);
 291         psmouse_dbg(psmouse, "tp_type_MTG = %d\n",
 292                         (param[6] & TP_METRICS_BIT_MTG) ? 1 : 0);
 293         psmouse_dbg(psmouse, "tp_palm = %d\n",
 294                         (param[6] & TP_METRICS_BIT_PALM) ? 1 : 0);
 295         psmouse_dbg(psmouse, "tp_stubborn = %d\n",
 296                         (param[6] & TP_METRICS_BIT_STUBBORN) ? 1 : 0);
 297         psmouse_dbg(psmouse, "tp_1f_jitter = %d\n",
 298                         (param[6] & TP_METRICS_BIT_1F_JITTER) >> 2);
 299         psmouse_dbg(psmouse, "tp_2f_jitter = %d\n",
 300                         (param[6] & TP_METRICS_BIT_2F_JITTER) >> 4);
 301         psmouse_dbg(psmouse, "tp_1f_spike = %d\n",
 302                         param[7] & TP_METRICS_BIT_1F_SPIKE);
 303         psmouse_dbg(psmouse, "tp_2f_spike = %d\n",
 304                         (param[7] & TP_METRICS_BIT_2F_SPIKE) >> 2);
 305         psmouse_dbg(psmouse, "tp_abs_packet_format_set = %d\n",
 306                         (param[7] & TP_METRICS_BIT_ABS_PKT_FORMAT_SET) >> 4);
 307 #endif
 308
 309         return 0;
 310 }
 311
 312 static int cypress_query_hardware(struct psmouse *psmouse)
 313 {
 314         int error;
 315
 316         error = cypress_read_fw_version(psmouse);
 317         if (error)
 318                 return error;
 319
 320         error = cypress_read_tp_metrics(psmouse);
 321         if (error)
 322                 return error;
 323
 324         return 0;
 325 }
 326
 327 static int cypress_set_absolute_mode(struct psmouse *psmouse)
 328 {
 329         struct cytp_data *cytp = psmouse->private;
 330         u8 param[3];
 331         int error;
 332
 333         error = cypress_send_ext_cmd(psmouse, CYTP_CMD_ABS_WITH_PRESSURE_MODE,
 334                                      param);
 335         if (error)
 336                 return error;
 337
 338         cytp->mode = (cytp->mode & ~CYTP_BIT_ABS_REL_MASK)
 339                         | CYTP_BIT_ABS_PRESSURE;
 340         cypress_set_packet_size(psmouse, 5);
 341
 342         return 0;
 343 }
 344
 345 /*
 346  * Reset trackpad device.
 347  * This is also the default mode when trackpad powered on.
 348  */
 349 static void cypress_reset(struct psmouse *psmouse)
 350 {
 351         struct cytp_data *cytp = psmouse->private;
 352
 353         cytp->mode = 0;
 354
 355         psmouse_reset(psmouse);
 356 }
 357
 358 static int cypress_set_input_params(struct input_dev *input,
 359                                     struct cytp_data *cytp)
 360 {
 361         int error;
 362
 363         if (!cytp->tp_res_x || !cytp->tp_res_y)
 364                 return -EINVAL;
 365
 366         __set_bit(EV_ABS, input->evbit);
 367         input_set_abs_params(input, ABS_X, 0, cytp->tp_max_abs_x, 0, 0);
 368         input_set_abs_params(input, ABS_Y, 0, cytp->tp_max_abs_y, 0, 0);
 369         input_set_abs_params(input, ABS_PRESSURE,
 370                              cytp->tp_min_pressure, cytp->tp_max_pressure, 0, 0);
 371         input_set_abs_params(input, ABS_TOOL_WIDTH, 0, 255, 0, 0);
 372
 373         /* finger position */
 374         input_set_abs_params(input, ABS_MT_POSITION_X, 0, cytp->tp_max_abs_x, 0, 0);
 375         input_set_abs_params(input, ABS_MT_POSITION_Y, 0, cytp->tp_max_abs_y, 0, 0);
 376         input_set_abs_params(input, ABS_MT_PRESSURE, 0, 255, 0, 0);
 377
 378         error = input_mt_init_slots(input, CYTP_MAX_MT_SLOTS,
 379                                     INPUT_MT_DROP_UNUSED | INPUT_MT_TRACK);
 380         if (error)
 381                 return error;
 382
 383         __set_bit(INPUT_PROP_SEMI_MT, input->propbit);
 384
 385         input_abs_set_res(input, ABS_X, cytp->tp_res_x);
 386         input_abs_set_res(input, ABS_Y, cytp->tp_res_y);
 387
 388         input_abs_set_res(input, ABS_MT_POSITION_X, cytp->tp_res_x);
 389         input_abs_set_res(input, ABS_MT_POSITION_Y, cytp->tp_res_y);
 390
 391         __set_bit(BTN_TOUCH, input->keybit);
 392         __set_bit(BTN_TOOL_FINGER, input->keybit);
 393         __set_bit(BTN_TOOL_DOUBLETAP, input->keybit);
 394         __set_bit(BTN_TOOL_TRIPLETAP, input->keybit);
 395         __set_bit(BTN_TOOL_QUADTAP, input->keybit);
 396         __set_bit(BTN_TOOL_QUINTTAP, input->keybit);
 397
 398         __clear_bit(EV_REL, input->evbit);
 399         __clear_bit(REL_X, input->relbit);
 400         __clear_bit(REL_Y, input->relbit);
 401
 402         __set_bit(EV_KEY, input->evbit);
 403         __set_bit(BTN_LEFT, input->keybit);
 404         __set_bit(BTN_RIGHT, input->keybit);
 405         __set_bit(BTN_MIDDLE, input->keybit);
 406
 407         return 0;
 408 }
 409
 410 static int cypress_get_finger_count(u8 header_byte)
 411 {
 412         u8 bits6_7;
 413         int finger_count;
 414
 415         bits6_7 = header_byte >> 6;
 416         finger_count = bits6_7 & 0x03;
 417
 418         if (finger_count == 1)
 419                 return 1;
 420
 421         if (header_byte & ABS_HSCROLL_BIT) {
 422                 /* HSCROLL gets added on to 0 finger count. */
 423                 switch (finger_count) {
 424                         case 0: return 4;
 425                         case 2: return 5;
 426                         default:
 427                                 /* Invalid contact (e.g. palm). Ignore it. */
 428                                 return 0;
 429                 }
 430         }
 431
 432         return finger_count;
 433 }
 434
 435
 436 static int cypress_parse_packet(struct psmouse *psmouse,
 437                                 struct cytp_data *cytp,
 438                                 struct cytp_report_data *report_data)
 439 {
 440         u8 *packet = psmouse->packet;
 441         u8 header_byte = packet[0];
 442
 443         memset(report_data, 0, sizeof(struct cytp_report_data));
 444
 445         report_data->contact_cnt = cypress_get_finger_count(header_byte);
 446         report_data->tap = (header_byte & ABS_MULTIFINGER_TAP) ? 1 : 0;
 447
 448         if (report_data->contact_cnt == 1) {
 449                 report_data->contacts[0].x =
 450                         ((packet[1] & 0x70) << 4) | packet[2];
 451                 report_data->contacts[0].y =
 452                         ((packet[1] & 0x07) << 8) | packet[3];
 453                 if (cytp->mode & CYTP_BIT_ABS_PRESSURE)
 454                         report_data->contacts[0].z = packet[4];
 455
 456         } else if (report_data->contact_cnt >= 2) {
 457                 report_data->contacts[0].x =
 458                         ((packet[1] & 0x70) << 4) | packet[2];
 459                 report_data->contacts[0].y =
 460                         ((packet[1] & 0x07) << 8) | packet[3];
 461                 if (cytp->mode & CYTP_BIT_ABS_PRESSURE)
 462                         report_data->contacts[0].z = packet[4];
 463
 464                 report_data->contacts[1].x =
 465                         ((packet[5] & 0xf0) << 4) | packet[6];
 466                 report_data->contacts[1].y =
 467                         ((packet[5] & 0x0f) << 8) | packet[7];
 468                 if (cytp->mode & CYTP_BIT_ABS_PRESSURE)
 469                         report_data->contacts[1].z = report_data->contacts[0].z;
 470         }
 471
 472         report_data->left = (header_byte & BTN_LEFT_BIT) ? 1 : 0;
 473         report_data->right = (header_byte & BTN_RIGHT_BIT) ? 1 : 0;
 474
 475         /*
 476          * This is only true if one of the mouse buttons were tapped.  Make
 477          * sure it doesn't turn into a click. The regular tap-to-click
 478          * functionality will handle that on its own. If we don't do this,
 479          * disabling tap-to-click won't affect the mouse button zones.
 480          */
 481         if (report_data->tap)
 482                 report_data->left = 0;
 483
 484 #ifdef CYTP_DEBUG_VERBOSE
 485         {
 486                 int i;
 487                 int n = report_data->contact_cnt;
 488                 psmouse_dbg(psmouse, "Dump parsed report data as below:\n");
 489                 psmouse_dbg(psmouse, "contact_cnt = %d\n",
 490                         report_data->contact_cnt);
 491                 if (n > CYTP_MAX_MT_SLOTS)
 492                     n = CYTP_MAX_MT_SLOTS;
 493                 for (i = 0; i < n; i++)
 494                         psmouse_dbg(psmouse, "contacts[%d] = {%d, %d, %d}\n", i,
 495                                         report_data->contacts[i].x,
 496                                         report_data->contacts[i].y,
 497                                         report_data->contacts[i].z);
 498                 psmouse_dbg(psmouse, "left = %d\n", report_data->left);
 499                 psmouse_dbg(psmouse, "right = %d\n", report_data->right);
 500                 psmouse_dbg(psmouse, "middle = %d\n", report_data->middle);
 501         }
 502 #endif
 503
 504         return 0;
 505 }
 506
 507 static void cypress_process_packet(struct psmouse *psmouse, bool zero_pkt)
 508 {
 509         int i;
 510         struct input_dev *input = psmouse->dev;
 511         struct cytp_data *cytp = psmouse->private;
 512         struct cytp_report_data report_data;
 513         struct cytp_contact *contact;
 514         struct input_mt_pos pos[CYTP_MAX_MT_SLOTS];
 515         int slots[CYTP_MAX_MT_SLOTS];
 516         int n;
 517
 518         cypress_parse_packet(psmouse, cytp, &report_data);
 519
 520         n = report_data.contact_cnt;
 521         if (n > CYTP_MAX_MT_SLOTS)
 522                 n = CYTP_MAX_MT_SLOTS;
 523
 524         for (i = 0; i < n; i++) {
 525                 contact = &report_data.contacts[i];
 526                 pos[i].x = contact->x;
 527                 pos[i].y = contact->y;
 528         }
 529
 530         input_mt_assign_slots(input, slots, pos, n, 0);
 531
 532         for (i = 0; i < n; i++) {
 533                 contact = &report_data.contacts[i];
 534                 input_mt_slot(input, slots[i]);
 535                 input_mt_report_slot_state(input, MT_TOOL_FINGER, true);
 536                 input_report_abs(input, ABS_MT_POSITION_X, contact->x);
 537                 input_report_abs(input, ABS_MT_POSITION_Y, contact->y);
 538                 input_report_abs(input, ABS_MT_PRESSURE, contact->z);
 539         }
 540
 541         input_mt_sync_frame(input);
 542
 543         input_mt_report_finger_count(input, report_data.contact_cnt);
 544
 545         input_report_key(input, BTN_LEFT, report_data.left);
 546         input_report_key(input, BTN_RIGHT, report_data.right);
 547         input_report_key(input, BTN_MIDDLE, report_data.middle);
 548
 549         input_sync(input);
 550 }
 551
 552 static psmouse_ret_t cypress_validate_byte(struct psmouse *psmouse)
 553 {
 554         int contact_cnt;
 555         int index = psmouse->pktcnt - 1;
 556         u8 *packet = psmouse->packet;
 557         struct cytp_data *cytp = psmouse->private;
 558
 559         if (index < 0 || index > cytp->pkt_size)
 560                 return PSMOUSE_BAD_DATA;
 561
 562         if (index == 0 && (packet[0] & 0xfc) == 0) {
 563                 /* call packet process for reporting finger leave. */
 564                 cypress_process_packet(psmouse, 1);
 565                 return PSMOUSE_FULL_PACKET;
 566         }
 567
 568         /*
 569          * Perform validation (and adjust packet size) based only on the
 570          * first byte; allow all further bytes through.
 571          */
 572         if (index != 0)
 573                 return PSMOUSE_GOOD_DATA;
 574
 575         /*
 576          * If absolute/relative mode bit has not been set yet, just pass
 577          * the byte through.
 578          */
 579         if ((cytp->mode & CYTP_BIT_ABS_REL_MASK) == 0)
 580                 return PSMOUSE_GOOD_DATA;
 581
 582         if ((packet[0] & 0x08) == 0x08)
 583                 return PSMOUSE_BAD_DATA;
 584
 585         contact_cnt = cypress_get_finger_count(packet[0]);
 586         if (cytp->mode & CYTP_BIT_ABS_NO_PRESSURE)
 587                 cypress_set_packet_size(psmouse, contact_cnt == 2 ? 7 : 4);
 588         else
 589                 cypress_set_packet_size(psmouse, contact_cnt == 2 ? 8 : 5);
 590
 591         return PSMOUSE_GOOD_DATA;
 592 }
 593
 594 static psmouse_ret_t cypress_protocol_handler(struct psmouse *psmouse)
 595 {
 596         struct cytp_data *cytp = psmouse->private;
 597
 598         if (psmouse->pktcnt >= cytp->pkt_size) {
 599                 cypress_process_packet(psmouse, 0);
 600                 return PSMOUSE_FULL_PACKET;
 601         }
 602
 603         return cypress_validate_byte(psmouse);
 604 }
 605
 606 static void cypress_set_rate(struct psmouse *psmouse, unsigned int rate)
 607 {
 608         struct cytp_data *cytp = psmouse->private;
 609         u8 rate_param;
 610
 611         if (rate >= 80) {
 612                 psmouse->rate = 80;
 613                 cytp->mode |= CYTP_BIT_HIGH_RATE;
 614         } else {
 615                 psmouse->rate = 40;
 616                 cytp->mode &= ~CYTP_BIT_HIGH_RATE;
 617         }
 618
 619         rate_param = (u8)rate;
 620         ps2_command(&psmouse->ps2dev, &rate_param, PSMOUSE_CMD_SETRATE);
 621 }
 622
 623 static void cypress_disconnect(struct psmouse *psmouse)
 624 {
 625         cypress_reset(psmouse);
 626         kfree(psmouse->private);
 627         psmouse->private = NULL;
 628 }
 629
 630 static int cypress_reconnect(struct psmouse *psmouse)
 631 {
 632         int tries = CYTP_PS2_CMD_TRIES;
 633         int error;
 634
 635         do {
 636                 cypress_reset(psmouse);
 637                 error = cypress_detect(psmouse, false);
 638         } while (error && (--tries > 0));
 639
 640         if (error) {
 641                 psmouse_err(psmouse, "Reconnect: unable to detect trackpad.\n");
 642                 return error;
 643         }
 644
 645         error = cypress_set_absolute_mode(psmouse);
 646         if (error) {
 647                 psmouse_err(psmouse, "Reconnect: Unable to initialize Cypress absolute mode.\n");
 648                 return error;
 649         }
 650
 651         return 0;
 652 }
 653
 654 int cypress_init(struct psmouse *psmouse)
 655 {
 656         struct cytp_data *cytp;
 657         int error;
 658
 659         cytp = kzalloc(sizeof(*cytp), GFP_KERNEL);
 660         if (!cytp)
 661                 return -ENOMEM;
 662
 663         psmouse->private = cytp;
 664         psmouse->pktsize = 8;
 665
 666         cypress_reset(psmouse);
 667
 668         error = cypress_query_hardware(psmouse);
 669         if (error) {
 670                 psmouse_err(psmouse, "Unable to query Trackpad hardware.\n");
 671                 goto err_exit;
 672         }
 673
 674         error = cypress_set_absolute_mode(psmouse);
 675         if (error) {
 676                 psmouse_err(psmouse, "init: Unable to initialize Cypress absolute mode.\n");
 677                 goto err_exit;
 678         }
 679
 680         error = cypress_set_input_params(psmouse->dev, cytp);
 681         if (error) {
 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 communicating with it as default PS2 mouse.
 700          */
 701         cypress_reset(psmouse);
 702
 703         psmouse->private = NULL;
 704         kfree(cytp);
 705
 706         return error;
 707 }