1 /* 2 * Cypress Trackpad PS/2 mouse driver 3 * 4 * Copyright (c) 2012 Cypress Semiconductor Corporation. 5 * 6 * Author: 7 * Dudley Du <dudl@cypress.com> 8 * 9 * Additional contributors include: 10 * Kamal Mostafa <kamal@canonical.com> 11 * Kyle Fazzari <git@status.e4ward.com> 12 * 13 * This program is free software; you can redistribute it and/or modify it 14 * under the terms of the GNU General Public License version 2 as published by 15 * the Free Software Foundation. 16 */ 17 18 #include <linux/init.h> 19 #include <linux/module.h> 20 #include <linux/kernel.h> 21 #include <linux/slab.h> 22 #include <linux/serio.h> 23 #include <linux/libps2.h> 24 #include <linux/input.h> 25 #include <linux/input/mt.h> 26 #include <linux/sched.h> 27 #include <linux/wait.h> 28 29 #include "cypress_ps2.h" 30 31 #undef CYTP_DEBUG_VERBOSE /* define this and DEBUG for more verbose dump */ 32 33 static void cypress_set_packet_size(struct psmouse *psmouse, unsigned int n) 34 { 35 struct cytp_data *cytp = psmouse->private; 36 cytp->pkt_size = n; 37 } 38 39 static const unsigned char cytp_rate[] = {10, 20, 40, 60, 100, 200}; 40 static const unsigned char cytp_resolution[] = {0x00, 0x01, 0x02, 0x03}; 41 42 static int cypress_ps2_sendbyte(struct psmouse *psmouse, int value) 43 { 44 struct ps2dev *ps2dev = &psmouse->ps2dev; 45 46 if (ps2_sendbyte(ps2dev, value & 0xff, CYTP_CMD_TIMEOUT) < 0) { 47 psmouse_dbg(psmouse, 48 "sending command 0x%02x failed, resp 0x%02x\n", 49 value & 0xff, ps2dev->nak); 50 if (ps2dev->nak == CYTP_PS2_RETRY) 51 return CYTP_PS2_RETRY; 52 else 53 return CYTP_PS2_ERROR; 54 } 55 56 #ifdef CYTP_DEBUG_VERBOSE 57 psmouse_dbg(psmouse, "sending command 0x%02x succeeded, resp 0xfa\n", 58 value & 0xff); 59 #endif 60 61 return 0; 62 } 63 64 static int cypress_ps2_ext_cmd(struct psmouse *psmouse, unsigned short cmd, 65 unsigned char data) 66 { 67 struct ps2dev *ps2dev = &psmouse->ps2dev; 68 int tries = CYTP_PS2_CMD_TRIES; 69 int rc; 70 71 ps2_begin_command(ps2dev); 72 73 do { 74 /* 75 * Send extension command byte (0xE8 or 0xF3). 76 * If sending the command fails, send recovery command 77 * to make the device return to the ready state. 78 */ 79 rc = cypress_ps2_sendbyte(psmouse, cmd & 0xff); 80 if (rc == CYTP_PS2_RETRY) { 81 rc = cypress_ps2_sendbyte(psmouse, 0x00); 82 if (rc == CYTP_PS2_RETRY) 83 rc = cypress_ps2_sendbyte(psmouse, 0x0a); 84 } 85 if (rc == CYTP_PS2_ERROR) 86 continue; 87 88 rc = cypress_ps2_sendbyte(psmouse, data); 89 if (rc == CYTP_PS2_RETRY) 90 rc = cypress_ps2_sendbyte(psmouse, data); 91 if (rc == CYTP_PS2_ERROR) 92 continue; 93 else 94 break; 95 } while (--tries > 0); 96 97 ps2_end_command(ps2dev); 98 99 return rc; 100 } 101 102 static int cypress_ps2_read_cmd_status(struct psmouse *psmouse, 103 unsigned char cmd, 104 unsigned char *param) 105 { 106 int rc; 107 struct ps2dev *ps2dev = &psmouse->ps2dev; 108 enum psmouse_state old_state; 109 int pktsize; 110 111 ps2_begin_command(&psmouse->ps2dev); 112 113 old_state = psmouse->state; 114 psmouse->state = PSMOUSE_CMD_MODE; 115 psmouse->pktcnt = 0; 116 117 pktsize = (cmd == CYTP_CMD_READ_TP_METRICS) ? 8 : 3; 118 memset(param, 0, pktsize); 119 120 rc = cypress_ps2_sendbyte(psmouse, 0xe9); 121 if (rc < 0) 122 goto out; 123 124 wait_event_timeout(ps2dev->wait, 125 (psmouse->pktcnt >= pktsize), 126 msecs_to_jiffies(CYTP_CMD_TIMEOUT)); 127 128 memcpy(param, psmouse->packet, pktsize); 129 130 psmouse_dbg(psmouse, "Command 0x%02x response data (0x): %*ph\n", 131 cmd, pktsize, param); 132 133 out: 134 psmouse->state = old_state; 135 psmouse->pktcnt = 0; 136 137 ps2_end_command(&psmouse->ps2dev); 138 139 return rc; 140 } 141 142 static bool cypress_verify_cmd_state(struct psmouse *psmouse, 143 unsigned char cmd, unsigned char *param) 144 { 145 bool rate_match = false; 146 bool resolution_match = false; 147 int i; 148 149 /* callers will do further checking. */ 150 if (cmd == CYTP_CMD_READ_CYPRESS_ID || 151 cmd == CYTP_CMD_STANDARD_MODE || 152 cmd == CYTP_CMD_READ_TP_METRICS) 153 return true; 154 155 if ((~param[0] & DFLT_RESP_BITS_VALID) == DFLT_RESP_BITS_VALID && 156 (param[0] & DFLT_RESP_BIT_MODE) == DFLT_RESP_STREAM_MODE) { 157 for (i = 0; i < sizeof(cytp_resolution); i++) 158 if (cytp_resolution[i] == param[1]) 159 resolution_match = true; 160 161 for (i = 0; i < sizeof(cytp_rate); i++) 162 if (cytp_rate[i] == param[2]) 163 rate_match = true; 164 165 if (resolution_match && rate_match) 166 return true; 167 } 168 169 psmouse_dbg(psmouse, "verify cmd state failed.\n"); 170 return false; 171 } 172 173 static int cypress_send_ext_cmd(struct psmouse *psmouse, unsigned char cmd, 174 unsigned char *param) 175 { 176 int tries = CYTP_PS2_CMD_TRIES; 177 int rc; 178 179 psmouse_dbg(psmouse, "send extension cmd 0x%02x, [%d %d %d %d]\n", 180 cmd, DECODE_CMD_AA(cmd), DECODE_CMD_BB(cmd), 181 DECODE_CMD_CC(cmd), DECODE_CMD_DD(cmd)); 182 183 do { 184 cypress_ps2_ext_cmd(psmouse, 185 PSMOUSE_CMD_SETRES, DECODE_CMD_DD(cmd)); 186 cypress_ps2_ext_cmd(psmouse, 187 PSMOUSE_CMD_SETRES, DECODE_CMD_CC(cmd)); 188 cypress_ps2_ext_cmd(psmouse, 189 PSMOUSE_CMD_SETRES, DECODE_CMD_BB(cmd)); 190 cypress_ps2_ext_cmd(psmouse, 191 PSMOUSE_CMD_SETRES, DECODE_CMD_AA(cmd)); 192 193 rc = cypress_ps2_read_cmd_status(psmouse, cmd, param); 194 if (rc) 195 continue; 196 197 if (cypress_verify_cmd_state(psmouse, cmd, param)) 198 return 0; 199 200 } while (--tries > 0); 201 202 return -EIO; 203 } 204 205 int cypress_detect(struct psmouse *psmouse, bool set_properties) 206 { 207 unsigned char param[3]; 208 209 if (cypress_send_ext_cmd(psmouse, CYTP_CMD_READ_CYPRESS_ID, param)) 210 return -ENODEV; 211 212 /* Check for Cypress Trackpad signature bytes: 0x33 0xCC */ 213 if (param[0] != 0x33 || param[1] != 0xCC) 214 return -ENODEV; 215 216 if (set_properties) { 217 psmouse->vendor = "Cypress"; 218 psmouse->name = "Trackpad"; 219 } 220 221 return 0; 222 } 223 224 static int cypress_read_fw_version(struct psmouse *psmouse) 225 { 226 struct cytp_data *cytp = psmouse->private; 227 unsigned char param[3]; 228 229 if (cypress_send_ext_cmd(psmouse, CYTP_CMD_READ_CYPRESS_ID, param)) 230 return -ENODEV; 231 232 /* Check for Cypress Trackpad signature bytes: 0x33 0xCC */ 233 if (param[0] != 0x33 || param[1] != 0xCC) 234 return -ENODEV; 235 236 cytp->fw_version = param[2] & FW_VERSION_MASX; 237 cytp->tp_metrics_supported = (param[2] & TP_METRICS_MASK) ? 1 : 0; 238 239 /* 240 * Trackpad fw_version 11 (in Dell XPS12) yields a bogus response to 241 * CYTP_CMD_READ_TP_METRICS so do not try to use it. LP: #1103594. 242 */ 243 if (cytp->fw_version >= 11) 244 cytp->tp_metrics_supported = 0; 245 246 psmouse_dbg(psmouse, "cytp->fw_version = %d\n", cytp->fw_version); 247 psmouse_dbg(psmouse, "cytp->tp_metrics_supported = %d\n", 248 cytp->tp_metrics_supported); 249 250 return 0; 251 } 252 253 static int cypress_read_tp_metrics(struct psmouse *psmouse) 254 { 255 struct cytp_data *cytp = psmouse->private; 256 unsigned char param[8]; 257 258 /* set default values for tp metrics. */ 259 cytp->tp_width = CYTP_DEFAULT_WIDTH; 260 cytp->tp_high = CYTP_DEFAULT_HIGH; 261 cytp->tp_max_abs_x = CYTP_ABS_MAX_X; 262 cytp->tp_max_abs_y = CYTP_ABS_MAX_Y; 263 cytp->tp_min_pressure = CYTP_MIN_PRESSURE; 264 cytp->tp_max_pressure = CYTP_MAX_PRESSURE; 265 cytp->tp_res_x = cytp->tp_max_abs_x / cytp->tp_width; 266 cytp->tp_res_y = cytp->tp_max_abs_y / cytp->tp_high; 267 268 if (!cytp->tp_metrics_supported) 269 return 0; 270 271 memset(param, 0, sizeof(param)); 272 if (cypress_send_ext_cmd(psmouse, CYTP_CMD_READ_TP_METRICS, param) == 0) { 273 /* Update trackpad parameters. */ 274 cytp->tp_max_abs_x = (param[1] << 8) | param[0]; 275 cytp->tp_max_abs_y = (param[3] << 8) | param[2]; 276 cytp->tp_min_pressure = param[4]; 277 cytp->tp_max_pressure = param[5]; 278 } 279 280 if (!cytp->tp_max_pressure || 281 cytp->tp_max_pressure < cytp->tp_min_pressure || 282 !cytp->tp_width || !cytp->tp_high || 283 !cytp->tp_max_abs_x || 284 cytp->tp_max_abs_x < cytp->tp_width || 285 !cytp->tp_max_abs_y || 286 cytp->tp_max_abs_y < cytp->tp_high) 287 return -EINVAL; 288 289 cytp->tp_res_x = cytp->tp_max_abs_x / cytp->tp_width; 290 cytp->tp_res_y = cytp->tp_max_abs_y / cytp->tp_high; 291 292 #ifdef CYTP_DEBUG_VERBOSE 293 psmouse_dbg(psmouse, "Dump trackpad hardware configuration as below:\n"); 294 psmouse_dbg(psmouse, "cytp->tp_width = %d\n", cytp->tp_width); 295 psmouse_dbg(psmouse, "cytp->tp_high = %d\n", cytp->tp_high); 296 psmouse_dbg(psmouse, "cytp->tp_max_abs_x = %d\n", cytp->tp_max_abs_x); 297 psmouse_dbg(psmouse, "cytp->tp_max_abs_y = %d\n", cytp->tp_max_abs_y); 298 psmouse_dbg(psmouse, "cytp->tp_min_pressure = %d\n", cytp->tp_min_pressure); 299 psmouse_dbg(psmouse, "cytp->tp_max_pressure = %d\n", cytp->tp_max_pressure); 300 psmouse_dbg(psmouse, "cytp->tp_res_x = %d\n", cytp->tp_res_x); 301 psmouse_dbg(psmouse, "cytp->tp_res_y = %d\n", cytp->tp_res_y); 302 303 psmouse_dbg(psmouse, "tp_type_APA = %d\n", 304 (param[6] & TP_METRICS_BIT_APA) ? 1 : 0); 305 psmouse_dbg(psmouse, "tp_type_MTG = %d\n", 306 (param[6] & TP_METRICS_BIT_MTG) ? 1 : 0); 307 psmouse_dbg(psmouse, "tp_palm = %d\n", 308 (param[6] & TP_METRICS_BIT_PALM) ? 1 : 0); 309 psmouse_dbg(psmouse, "tp_stubborn = %d\n", 310 (param[6] & TP_METRICS_BIT_STUBBORN) ? 1 : 0); 311 psmouse_dbg(psmouse, "tp_1f_jitter = %d\n", 312 (param[6] & TP_METRICS_BIT_1F_JITTER) >> 2); 313 psmouse_dbg(psmouse, "tp_2f_jitter = %d\n", 314 (param[6] & TP_METRICS_BIT_2F_JITTER) >> 4); 315 psmouse_dbg(psmouse, "tp_1f_spike = %d\n", 316 param[7] & TP_METRICS_BIT_1F_SPIKE); 317 psmouse_dbg(psmouse, "tp_2f_spike = %d\n", 318 (param[7] & TP_METRICS_BIT_2F_SPIKE) >> 2); 319 psmouse_dbg(psmouse, "tp_abs_packet_format_set = %d\n", 320 (param[7] & TP_METRICS_BIT_ABS_PKT_FORMAT_SET) >> 4); 321 #endif 322 323 return 0; 324 } 325 326 static int cypress_query_hardware(struct psmouse *psmouse) 327 { 328 int ret; 329 330 ret = cypress_read_fw_version(psmouse); 331 if (ret) 332 return ret; 333 334 ret = cypress_read_tp_metrics(psmouse); 335 if (ret) 336 return ret; 337 338 return 0; 339 } 340 341 static int cypress_set_absolute_mode(struct psmouse *psmouse) 342 { 343 struct cytp_data *cytp = psmouse->private; 344 unsigned char param[3]; 345 346 if (cypress_send_ext_cmd(psmouse, CYTP_CMD_ABS_WITH_PRESSURE_MODE, param) < 0) 347 return -1; 348 349 cytp->mode = (cytp->mode & ~CYTP_BIT_ABS_REL_MASK) 350 | CYTP_BIT_ABS_PRESSURE; 351 cypress_set_packet_size(psmouse, 5); 352 353 return 0; 354 } 355 356 /* 357 * Reset trackpad device. 358 * This is also the default mode when trackpad powered on. 359 */ 360 static void cypress_reset(struct psmouse *psmouse) 361 { 362 struct cytp_data *cytp = psmouse->private; 363 364 cytp->mode = 0; 365 366 psmouse_reset(psmouse); 367 } 368 369 static int cypress_set_input_params(struct input_dev *input, 370 struct cytp_data *cytp) 371 { 372 int ret; 373 374 if (!cytp->tp_res_x || !cytp->tp_res_y) 375 return -EINVAL; 376 377 __set_bit(EV_ABS, input->evbit); 378 input_set_abs_params(input, ABS_X, 0, cytp->tp_max_abs_x, 0, 0); 379 input_set_abs_params(input, ABS_Y, 0, cytp->tp_max_abs_y, 0, 0); 380 input_set_abs_params(input, ABS_PRESSURE, 381 cytp->tp_min_pressure, cytp->tp_max_pressure, 0, 0); 382 input_set_abs_params(input, ABS_TOOL_WIDTH, 0, 255, 0, 0); 383 384 /* finger position */ 385 input_set_abs_params(input, ABS_MT_POSITION_X, 0, cytp->tp_max_abs_x, 0, 0); 386 input_set_abs_params(input, ABS_MT_POSITION_Y, 0, cytp->tp_max_abs_y, 0, 0); 387 input_set_abs_params(input, ABS_MT_PRESSURE, 0, 255, 0, 0); 388 389 ret = input_mt_init_slots(input, CYTP_MAX_MT_SLOTS, 390 INPUT_MT_DROP_UNUSED|INPUT_MT_TRACK); 391 if (ret < 0) 392 return ret; 393 394 __set_bit(INPUT_PROP_SEMI_MT, input->propbit); 395 396 input_abs_set_res(input, ABS_X, cytp->tp_res_x); 397 input_abs_set_res(input, ABS_Y, cytp->tp_res_y); 398 399 input_abs_set_res(input, ABS_MT_POSITION_X, cytp->tp_res_x); 400 input_abs_set_res(input, ABS_MT_POSITION_Y, cytp->tp_res_y); 401 402 __set_bit(BTN_TOUCH, input->keybit); 403 __set_bit(BTN_TOOL_FINGER, input->keybit); 404 __set_bit(BTN_TOOL_DOUBLETAP, input->keybit); 405 __set_bit(BTN_TOOL_TRIPLETAP, input->keybit); 406 __set_bit(BTN_TOOL_QUADTAP, input->keybit); 407 __set_bit(BTN_TOOL_QUINTTAP, input->keybit); 408 409 __clear_bit(EV_REL, input->evbit); 410 __clear_bit(REL_X, input->relbit); 411 __clear_bit(REL_Y, input->relbit); 412 413 __set_bit(INPUT_PROP_BUTTONPAD, input->propbit); 414 __set_bit(EV_KEY, input->evbit); 415 __set_bit(BTN_LEFT, input->keybit); 416 __set_bit(BTN_RIGHT, input->keybit); 417 __set_bit(BTN_MIDDLE, input->keybit); 418 419 input_set_drvdata(input, cytp); 420 421 return 0; 422 } 423 424 static int cypress_get_finger_count(unsigned char header_byte) 425 { 426 unsigned char bits6_7; 427 int finger_count; 428 429 bits6_7 = header_byte >> 6; 430 finger_count = bits6_7 & 0x03; 431 432 if (finger_count == 1) 433 return 1; 434 435 if (header_byte & ABS_HSCROLL_BIT) { 436 /* HSCROLL gets added on to 0 finger count. */ 437 switch (finger_count) { 438 case 0: return 4; 439 case 2: return 5; 440 default: 441 /* Invalid contact (e.g. palm). Ignore it. */ 442 return -1; 443 } 444 } 445 446 return finger_count; 447 } 448 449 450 static int cypress_parse_packet(struct psmouse *psmouse, 451 struct cytp_data *cytp, struct cytp_report_data *report_data) 452 { 453 unsigned char *packet = psmouse->packet; 454 unsigned char header_byte = packet[0]; 455 int contact_cnt; 456 457 memset(report_data, 0, sizeof(struct cytp_report_data)); 458 459 contact_cnt = cypress_get_finger_count(header_byte); 460 461 if (contact_cnt < 0) /* e.g. palm detect */ 462 return -EINVAL; 463 464 report_data->contact_cnt = contact_cnt; 465 466 report_data->tap = (header_byte & ABS_MULTIFINGER_TAP) ? 1 : 0; 467 468 if (report_data->contact_cnt == 1) { 469 report_data->contacts[0].x = 470 ((packet[1] & 0x70) << 4) | packet[2]; 471 report_data->contacts[0].y = 472 ((packet[1] & 0x07) << 8) | packet[3]; 473 if (cytp->mode & CYTP_BIT_ABS_PRESSURE) 474 report_data->contacts[0].z = packet[4]; 475 476 } else if (report_data->contact_cnt >= 2) { 477 report_data->contacts[0].x = 478 ((packet[1] & 0x70) << 4) | packet[2]; 479 report_data->contacts[0].y = 480 ((packet[1] & 0x07) << 8) | packet[3]; 481 if (cytp->mode & CYTP_BIT_ABS_PRESSURE) 482 report_data->contacts[0].z = packet[4]; 483 484 report_data->contacts[1].x = 485 ((packet[5] & 0xf0) << 4) | packet[6]; 486 report_data->contacts[1].y = 487 ((packet[5] & 0x0f) << 8) | packet[7]; 488 if (cytp->mode & CYTP_BIT_ABS_PRESSURE) 489 report_data->contacts[1].z = report_data->contacts[0].z; 490 } 491 492 report_data->left = (header_byte & BTN_LEFT_BIT) ? 1 : 0; 493 report_data->right = (header_byte & BTN_RIGHT_BIT) ? 1 : 0; 494 495 /* 496 * This is only true if one of the mouse buttons were tapped. Make 497 * sure it doesn't turn into a click. The regular tap-to-click 498 * functionality will handle that on its own. If we don't do this, 499 * disabling tap-to-click won't affect the mouse button zones. 500 */ 501 if (report_data->tap) 502 report_data->left = 0; 503 504 #ifdef CYTP_DEBUG_VERBOSE 505 { 506 int i; 507 int n = report_data->contact_cnt; 508 psmouse_dbg(psmouse, "Dump parsed report data as below:\n"); 509 psmouse_dbg(psmouse, "contact_cnt = %d\n", 510 report_data->contact_cnt); 511 if (n > CYTP_MAX_MT_SLOTS) 512 n = CYTP_MAX_MT_SLOTS; 513 for (i = 0; i < n; i++) 514 psmouse_dbg(psmouse, "contacts[%d] = {%d, %d, %d}\n", i, 515 report_data->contacts[i].x, 516 report_data->contacts[i].y, 517 report_data->contacts[i].z); 518 psmouse_dbg(psmouse, "left = %d\n", report_data->left); 519 psmouse_dbg(psmouse, "right = %d\n", report_data->right); 520 psmouse_dbg(psmouse, "middle = %d\n", report_data->middle); 521 } 522 #endif 523 524 return 0; 525 } 526 527 static void cypress_process_packet(struct psmouse *psmouse, bool zero_pkt) 528 { 529 int i; 530 struct input_dev *input = psmouse->dev; 531 struct cytp_data *cytp = psmouse->private; 532 struct cytp_report_data report_data; 533 struct cytp_contact *contact; 534 struct input_mt_pos pos[CYTP_MAX_MT_SLOTS]; 535 int slots[CYTP_MAX_MT_SLOTS]; 536 int n; 537 538 if (cypress_parse_packet(psmouse, cytp, &report_data)) 539 return; 540 541 n = report_data.contact_cnt; 542 543 if (n > CYTP_MAX_MT_SLOTS) 544 n = CYTP_MAX_MT_SLOTS; 545 546 for (i = 0; i < n; i++) { 547 contact = &report_data.contacts[i]; 548 pos[i].x = contact->x; 549 pos[i].y = contact->y; 550 } 551 552 input_mt_assign_slots(input, slots, pos, n); 553 554 for (i = 0; i < n; i++) { 555 contact = &report_data.contacts[i]; 556 input_mt_slot(input, slots[i]); 557 input_mt_report_slot_state(input, MT_TOOL_FINGER, true); 558 input_report_abs(input, ABS_MT_POSITION_X, contact->x); 559 input_report_abs(input, ABS_MT_POSITION_Y, contact->y); 560 input_report_abs(input, ABS_MT_PRESSURE, contact->z); 561 } 562 563 input_mt_sync_frame(input); 564 565 input_mt_report_finger_count(input, report_data.contact_cnt); 566 567 input_report_key(input, BTN_LEFT, report_data.left); 568 input_report_key(input, BTN_RIGHT, report_data.right); 569 input_report_key(input, BTN_MIDDLE, report_data.middle); 570 571 input_sync(input); 572 } 573 574 static psmouse_ret_t cypress_validate_byte(struct psmouse *psmouse) 575 { 576 int contact_cnt; 577 int index = psmouse->pktcnt - 1; 578 unsigned char *packet = psmouse->packet; 579 struct cytp_data *cytp = psmouse->private; 580 581 if (index < 0 || index > cytp->pkt_size) 582 return PSMOUSE_BAD_DATA; 583 584 if (index == 0 && (packet[0] & 0xfc) == 0) { 585 /* call packet process for reporting finger leave. */ 586 cypress_process_packet(psmouse, 1); 587 return PSMOUSE_FULL_PACKET; 588 } 589 590 /* 591 * Perform validation (and adjust packet size) based only on the 592 * first byte; allow all further bytes through. 593 */ 594 if (index != 0) 595 return PSMOUSE_GOOD_DATA; 596 597 /* 598 * If absolute/relative mode bit has not been set yet, just pass 599 * the byte through. 600 */ 601 if ((cytp->mode & CYTP_BIT_ABS_REL_MASK) == 0) 602 return PSMOUSE_GOOD_DATA; 603 604 if ((packet[0] & 0x08) == 0x08) 605 return PSMOUSE_BAD_DATA; 606 607 contact_cnt = cypress_get_finger_count(packet[0]); 608 609 if (contact_cnt < 0) 610 return PSMOUSE_BAD_DATA; 611 612 if (cytp->mode & CYTP_BIT_ABS_NO_PRESSURE) 613 cypress_set_packet_size(psmouse, contact_cnt == 2 ? 7 : 4); 614 else 615 cypress_set_packet_size(psmouse, contact_cnt == 2 ? 8 : 5); 616 617 return PSMOUSE_GOOD_DATA; 618 } 619 620 static psmouse_ret_t cypress_protocol_handler(struct psmouse *psmouse) 621 { 622 struct cytp_data *cytp = psmouse->private; 623 624 if (psmouse->pktcnt >= cytp->pkt_size) { 625 cypress_process_packet(psmouse, 0); 626 return PSMOUSE_FULL_PACKET; 627 } 628 629 return cypress_validate_byte(psmouse); 630 } 631 632 static void cypress_set_rate(struct psmouse *psmouse, unsigned int rate) 633 { 634 struct cytp_data *cytp = psmouse->private; 635 636 if (rate >= 80) { 637 psmouse->rate = 80; 638 cytp->mode |= CYTP_BIT_HIGH_RATE; 639 } else { 640 psmouse->rate = 40; 641 cytp->mode &= ~CYTP_BIT_HIGH_RATE; 642 } 643 644 ps2_command(&psmouse->ps2dev, (unsigned char *)&psmouse->rate, 645 PSMOUSE_CMD_SETRATE); 646 } 647 648 static void cypress_disconnect(struct psmouse *psmouse) 649 { 650 cypress_reset(psmouse); 651 kfree(psmouse->private); 652 psmouse->private = NULL; 653 } 654 655 static int cypress_reconnect(struct psmouse *psmouse) 656 { 657 int tries = CYTP_PS2_CMD_TRIES; 658 int rc; 659 660 do { 661 cypress_reset(psmouse); 662 rc = cypress_detect(psmouse, false); 663 } while (rc && (--tries > 0)); 664 665 if (rc) { 666 psmouse_err(psmouse, "Reconnect: unable to detect trackpad.\n"); 667 return -1; 668 } 669 670 if (cypress_set_absolute_mode(psmouse)) { 671 psmouse_err(psmouse, "Reconnect: Unable to initialize Cypress absolute mode.\n"); 672 return -1; 673 } 674 675 return 0; 676 } 677 678 int cypress_init(struct psmouse *psmouse) 679 { 680 struct cytp_data *cytp; 681 682 cytp = (struct cytp_data *)kzalloc(sizeof(struct cytp_data), GFP_KERNEL); 683 psmouse->private = (void *)cytp; 684 if (cytp == NULL) 685 return -ENOMEM; 686 687 cypress_reset(psmouse); 688 689 psmouse->pktsize = 8; 690 691 if (cypress_query_hardware(psmouse)) { 692 psmouse_err(psmouse, "Unable to query Trackpad hardware.\n"); 693 goto err_exit; 694 } 695 696 if (cypress_set_absolute_mode(psmouse)) { 697 psmouse_err(psmouse, "init: Unable to initialize Cypress absolute mode.\n"); 698 goto err_exit; 699 } 700 701 if (cypress_set_input_params(psmouse->dev, cytp) < 0) { 702 psmouse_err(psmouse, "init: Unable to set input params.\n"); 703 goto err_exit; 704 } 705 706 psmouse->model = 1; 707 psmouse->protocol_handler = cypress_protocol_handler; 708 psmouse->set_rate = cypress_set_rate; 709 psmouse->disconnect = cypress_disconnect; 710 psmouse->reconnect = cypress_reconnect; 711 psmouse->cleanup = cypress_reset; 712 psmouse->resync_time = 0; 713 714 return 0; 715 716 err_exit: 717 /* 718 * Reset Cypress Trackpad as a standard mouse. Then 719 * let psmouse driver commmunicating with it as default PS2 mouse. 720 */ 721 cypress_reset(psmouse); 722 723 psmouse->private = NULL; 724 kfree(cytp); 725 726 return -1; 727 } 728 729 bool cypress_supported(void) 730 { 731 return true; 732 } 733