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 psmouse_dbg(psmouse, "cytp->fw_version = %d\n", cytp->fw_version); 240 psmouse_dbg(psmouse, "cytp->tp_metrics_supported = %d\n", 241 cytp->tp_metrics_supported); 242 243 return 0; 244 } 245 246 static int cypress_read_tp_metrics(struct psmouse *psmouse) 247 { 248 struct cytp_data *cytp = psmouse->private; 249 unsigned char param[8]; 250 251 /* set default values for tp metrics. */ 252 cytp->tp_width = CYTP_DEFAULT_WIDTH; 253 cytp->tp_high = CYTP_DEFAULT_HIGH; 254 cytp->tp_max_abs_x = CYTP_ABS_MAX_X; 255 cytp->tp_max_abs_y = CYTP_ABS_MAX_Y; 256 cytp->tp_min_pressure = CYTP_MIN_PRESSURE; 257 cytp->tp_max_pressure = CYTP_MAX_PRESSURE; 258 cytp->tp_res_x = cytp->tp_max_abs_x / cytp->tp_width; 259 cytp->tp_res_y = cytp->tp_max_abs_y / cytp->tp_high; 260 261 memset(param, 0, sizeof(param)); 262 if (cypress_send_ext_cmd(psmouse, CYTP_CMD_READ_TP_METRICS, param) == 0) { 263 /* Update trackpad parameters. */ 264 cytp->tp_max_abs_x = (param[1] << 8) | param[0]; 265 cytp->tp_max_abs_y = (param[3] << 8) | param[2]; 266 cytp->tp_min_pressure = param[4]; 267 cytp->tp_max_pressure = param[5]; 268 } 269 270 if (!cytp->tp_max_pressure || 271 cytp->tp_max_pressure < cytp->tp_min_pressure || 272 !cytp->tp_width || !cytp->tp_high || 273 !cytp->tp_max_abs_x || 274 cytp->tp_max_abs_x < cytp->tp_width || 275 !cytp->tp_max_abs_y || 276 cytp->tp_max_abs_y < cytp->tp_high) 277 return -EINVAL; 278 279 cytp->tp_res_x = cytp->tp_max_abs_x / cytp->tp_width; 280 cytp->tp_res_y = cytp->tp_max_abs_y / cytp->tp_high; 281 282 #ifdef CYTP_DEBUG_VERBOSE 283 psmouse_dbg(psmouse, "Dump trackpad hardware configuration as below:\n"); 284 psmouse_dbg(psmouse, "cytp->tp_width = %d\n", cytp->tp_width); 285 psmouse_dbg(psmouse, "cytp->tp_high = %d\n", cytp->tp_high); 286 psmouse_dbg(psmouse, "cytp->tp_max_abs_x = %d\n", cytp->tp_max_abs_x); 287 psmouse_dbg(psmouse, "cytp->tp_max_abs_y = %d\n", cytp->tp_max_abs_y); 288 psmouse_dbg(psmouse, "cytp->tp_min_pressure = %d\n", cytp->tp_min_pressure); 289 psmouse_dbg(psmouse, "cytp->tp_max_pressure = %d\n", cytp->tp_max_pressure); 290 psmouse_dbg(psmouse, "cytp->tp_res_x = %d\n", cytp->tp_res_x); 291 psmouse_dbg(psmouse, "cytp->tp_res_y = %d\n", cytp->tp_res_y); 292 293 psmouse_dbg(psmouse, "tp_type_APA = %d\n", 294 (param[6] & TP_METRICS_BIT_APA) ? 1 : 0); 295 psmouse_dbg(psmouse, "tp_type_MTG = %d\n", 296 (param[6] & TP_METRICS_BIT_MTG) ? 1 : 0); 297 psmouse_dbg(psmouse, "tp_palm = %d\n", 298 (param[6] & TP_METRICS_BIT_PALM) ? 1 : 0); 299 psmouse_dbg(psmouse, "tp_stubborn = %d\n", 300 (param[6] & TP_METRICS_BIT_STUBBORN) ? 1 : 0); 301 psmouse_dbg(psmouse, "tp_1f_jitter = %d\n", 302 (param[6] & TP_METRICS_BIT_1F_JITTER) >> 2); 303 psmouse_dbg(psmouse, "tp_2f_jitter = %d\n", 304 (param[6] & TP_METRICS_BIT_2F_JITTER) >> 4); 305 psmouse_dbg(psmouse, "tp_1f_spike = %d\n", 306 param[7] & TP_METRICS_BIT_1F_SPIKE); 307 psmouse_dbg(psmouse, "tp_2f_spike = %d\n", 308 (param[7] & TP_METRICS_BIT_2F_SPIKE) >> 2); 309 psmouse_dbg(psmouse, "tp_abs_packet_format_set = %d\n", 310 (param[7] & TP_METRICS_BIT_ABS_PKT_FORMAT_SET) >> 4); 311 #endif 312 313 return 0; 314 } 315 316 static int cypress_query_hardware(struct psmouse *psmouse) 317 { 318 struct cytp_data *cytp = psmouse->private; 319 int ret; 320 321 ret = cypress_read_fw_version(psmouse); 322 if (ret) 323 return ret; 324 325 if (cytp->tp_metrics_supported) { 326 ret = cypress_read_tp_metrics(psmouse); 327 if (ret) 328 return ret; 329 } 330 331 return 0; 332 } 333 334 static int cypress_set_absolute_mode(struct psmouse *psmouse) 335 { 336 struct cytp_data *cytp = psmouse->private; 337 unsigned char param[3]; 338 339 if (cypress_send_ext_cmd(psmouse, CYTP_CMD_ABS_WITH_PRESSURE_MODE, param) < 0) 340 return -1; 341 342 cytp->mode = (cytp->mode & ~CYTP_BIT_ABS_REL_MASK) 343 | CYTP_BIT_ABS_PRESSURE; 344 cypress_set_packet_size(psmouse, 5); 345 346 return 0; 347 } 348 349 /* 350 * Reset trackpad device. 351 * This is also the default mode when trackpad powered on. 352 */ 353 static void cypress_reset(struct psmouse *psmouse) 354 { 355 struct cytp_data *cytp = psmouse->private; 356 357 cytp->mode = 0; 358 359 psmouse_reset(psmouse); 360 } 361 362 static int cypress_set_input_params(struct input_dev *input, 363 struct cytp_data *cytp) 364 { 365 int ret; 366 367 if (!cytp->tp_res_x || !cytp->tp_res_y) 368 return -EINVAL; 369 370 __set_bit(EV_ABS, input->evbit); 371 input_set_abs_params(input, ABS_X, 0, cytp->tp_max_abs_x, 0, 0); 372 input_set_abs_params(input, ABS_Y, 0, cytp->tp_max_abs_y, 0, 0); 373 input_set_abs_params(input, ABS_PRESSURE, 374 cytp->tp_min_pressure, cytp->tp_max_pressure, 0, 0); 375 input_set_abs_params(input, ABS_TOOL_WIDTH, 0, 255, 0, 0); 376 377 /* finger position */ 378 input_set_abs_params(input, ABS_MT_POSITION_X, 0, cytp->tp_max_abs_x, 0, 0); 379 input_set_abs_params(input, ABS_MT_POSITION_Y, 0, cytp->tp_max_abs_y, 0, 0); 380 input_set_abs_params(input, ABS_MT_PRESSURE, 0, 255, 0, 0); 381 382 ret = input_mt_init_slots(input, CYTP_MAX_MT_SLOTS, 383 INPUT_MT_DROP_UNUSED|INPUT_MT_TRACK); 384 if (ret < 0) 385 return ret; 386 387 __set_bit(INPUT_PROP_SEMI_MT, input->propbit); 388 389 input_abs_set_res(input, ABS_X, cytp->tp_res_x); 390 input_abs_set_res(input, ABS_Y, cytp->tp_res_y); 391 392 input_abs_set_res(input, ABS_MT_POSITION_X, cytp->tp_res_x); 393 input_abs_set_res(input, ABS_MT_POSITION_Y, cytp->tp_res_y); 394 395 __set_bit(BTN_TOUCH, input->keybit); 396 __set_bit(BTN_TOOL_FINGER, input->keybit); 397 __set_bit(BTN_TOOL_DOUBLETAP, input->keybit); 398 __set_bit(BTN_TOOL_TRIPLETAP, input->keybit); 399 __set_bit(BTN_TOOL_QUADTAP, input->keybit); 400 __set_bit(BTN_TOOL_QUINTTAP, input->keybit); 401 402 __clear_bit(EV_REL, input->evbit); 403 __clear_bit(REL_X, input->relbit); 404 __clear_bit(REL_Y, input->relbit); 405 406 __set_bit(INPUT_PROP_BUTTONPAD, input->propbit); 407 __set_bit(EV_KEY, input->evbit); 408 __set_bit(BTN_LEFT, input->keybit); 409 __set_bit(BTN_RIGHT, input->keybit); 410 __set_bit(BTN_MIDDLE, input->keybit); 411 412 input_set_drvdata(input, cytp); 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 -1; 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 int contact_cnt; 449 450 memset(report_data, 0, sizeof(struct cytp_report_data)); 451 452 contact_cnt = cypress_get_finger_count(header_byte); 453 454 if (contact_cnt < 0) /* e.g. palm detect */ 455 return -EINVAL; 456 457 report_data->contact_cnt = contact_cnt; 458 459 report_data->tap = (header_byte & ABS_MULTIFINGER_TAP) ? 1 : 0; 460 461 if (report_data->contact_cnt == 1) { 462 report_data->contacts[0].x = 463 ((packet[1] & 0x70) << 4) | packet[2]; 464 report_data->contacts[0].y = 465 ((packet[1] & 0x07) << 8) | packet[3]; 466 if (cytp->mode & CYTP_BIT_ABS_PRESSURE) 467 report_data->contacts[0].z = packet[4]; 468 469 } else if (report_data->contact_cnt >= 2) { 470 report_data->contacts[0].x = 471 ((packet[1] & 0x70) << 4) | packet[2]; 472 report_data->contacts[0].y = 473 ((packet[1] & 0x07) << 8) | packet[3]; 474 if (cytp->mode & CYTP_BIT_ABS_PRESSURE) 475 report_data->contacts[0].z = packet[4]; 476 477 report_data->contacts[1].x = 478 ((packet[5] & 0xf0) << 4) | packet[6]; 479 report_data->contacts[1].y = 480 ((packet[5] & 0x0f) << 8) | packet[7]; 481 if (cytp->mode & CYTP_BIT_ABS_PRESSURE) 482 report_data->contacts[1].z = report_data->contacts[0].z; 483 } 484 485 report_data->left = (header_byte & BTN_LEFT_BIT) ? 1 : 0; 486 report_data->right = (header_byte & BTN_RIGHT_BIT) ? 1 : 0; 487 488 /* 489 * This is only true if one of the mouse buttons were tapped. Make 490 * sure it doesn't turn into a click. The regular tap-to-click 491 * functionality will handle that on its own. If we don't do this, 492 * disabling tap-to-click won't affect the mouse button zones. 493 */ 494 if (report_data->tap) 495 report_data->left = 0; 496 497 #ifdef CYTP_DEBUG_VERBOSE 498 { 499 int i; 500 int n = report_data->contact_cnt; 501 psmouse_dbg(psmouse, "Dump parsed report data as below:\n"); 502 psmouse_dbg(psmouse, "contact_cnt = %d\n", 503 report_data->contact_cnt); 504 if (n > CYTP_MAX_MT_SLOTS) 505 n = CYTP_MAX_MT_SLOTS; 506 for (i = 0; i < n; i++) 507 psmouse_dbg(psmouse, "contacts[%d] = {%d, %d, %d}\n", i, 508 report_data->contacts[i].x, 509 report_data->contacts[i].y, 510 report_data->contacts[i].z); 511 psmouse_dbg(psmouse, "left = %d\n", report_data->left); 512 psmouse_dbg(psmouse, "right = %d\n", report_data->right); 513 psmouse_dbg(psmouse, "middle = %d\n", report_data->middle); 514 } 515 #endif 516 517 return 0; 518 } 519 520 static void cypress_process_packet(struct psmouse *psmouse, bool zero_pkt) 521 { 522 int i; 523 struct input_dev *input = psmouse->dev; 524 struct cytp_data *cytp = psmouse->private; 525 struct cytp_report_data report_data; 526 struct cytp_contact *contact; 527 struct input_mt_pos pos[CYTP_MAX_MT_SLOTS]; 528 int slots[CYTP_MAX_MT_SLOTS]; 529 int n; 530 531 if (cypress_parse_packet(psmouse, cytp, &report_data)) 532 return; 533 534 n = report_data.contact_cnt; 535 536 if (n > CYTP_MAX_MT_SLOTS) 537 n = CYTP_MAX_MT_SLOTS; 538 539 for (i = 0; i < n; i++) { 540 contact = &report_data.contacts[i]; 541 pos[i].x = contact->x; 542 pos[i].y = contact->y; 543 } 544 545 input_mt_assign_slots(input, slots, pos, n); 546 547 for (i = 0; i < n; i++) { 548 contact = &report_data.contacts[i]; 549 input_mt_slot(input, slots[i]); 550 input_mt_report_slot_state(input, MT_TOOL_FINGER, true); 551 input_report_abs(input, ABS_MT_POSITION_X, contact->x); 552 input_report_abs(input, ABS_MT_POSITION_Y, contact->y); 553 input_report_abs(input, ABS_MT_PRESSURE, contact->z); 554 } 555 556 input_mt_sync_frame(input); 557 558 input_mt_report_finger_count(input, report_data.contact_cnt); 559 560 input_report_key(input, BTN_LEFT, report_data.left); 561 input_report_key(input, BTN_RIGHT, report_data.right); 562 input_report_key(input, BTN_MIDDLE, report_data.middle); 563 564 input_sync(input); 565 } 566 567 static psmouse_ret_t cypress_validate_byte(struct psmouse *psmouse) 568 { 569 int contact_cnt; 570 int index = psmouse->pktcnt - 1; 571 unsigned char *packet = psmouse->packet; 572 struct cytp_data *cytp = psmouse->private; 573 574 if (index < 0 || index > cytp->pkt_size) 575 return PSMOUSE_BAD_DATA; 576 577 if (index == 0 && (packet[0] & 0xfc) == 0) { 578 /* call packet process for reporting finger leave. */ 579 cypress_process_packet(psmouse, 1); 580 return PSMOUSE_FULL_PACKET; 581 } 582 583 /* 584 * Perform validation (and adjust packet size) based only on the 585 * first byte; allow all further bytes through. 586 */ 587 if (index != 0) 588 return PSMOUSE_GOOD_DATA; 589 590 /* 591 * If absolute/relative mode bit has not been set yet, just pass 592 * the byte through. 593 */ 594 if ((cytp->mode & CYTP_BIT_ABS_REL_MASK) == 0) 595 return PSMOUSE_GOOD_DATA; 596 597 if ((packet[0] & 0x08) == 0x08) 598 return PSMOUSE_BAD_DATA; 599 600 contact_cnt = cypress_get_finger_count(packet[0]); 601 602 if (contact_cnt < 0) 603 return PSMOUSE_BAD_DATA; 604 605 if (cytp->mode & CYTP_BIT_ABS_NO_PRESSURE) 606 cypress_set_packet_size(psmouse, contact_cnt == 2 ? 7 : 4); 607 else 608 cypress_set_packet_size(psmouse, contact_cnt == 2 ? 8 : 5); 609 610 return PSMOUSE_GOOD_DATA; 611 } 612 613 static psmouse_ret_t cypress_protocol_handler(struct psmouse *psmouse) 614 { 615 struct cytp_data *cytp = psmouse->private; 616 617 if (psmouse->pktcnt >= cytp->pkt_size) { 618 cypress_process_packet(psmouse, 0); 619 return PSMOUSE_FULL_PACKET; 620 } 621 622 return cypress_validate_byte(psmouse); 623 } 624 625 static void cypress_set_rate(struct psmouse *psmouse, unsigned int rate) 626 { 627 struct cytp_data *cytp = psmouse->private; 628 629 if (rate >= 80) { 630 psmouse->rate = 80; 631 cytp->mode |= CYTP_BIT_HIGH_RATE; 632 } else { 633 psmouse->rate = 40; 634 cytp->mode &= ~CYTP_BIT_HIGH_RATE; 635 } 636 637 ps2_command(&psmouse->ps2dev, (unsigned char *)&psmouse->rate, 638 PSMOUSE_CMD_SETRATE); 639 } 640 641 static void cypress_disconnect(struct psmouse *psmouse) 642 { 643 cypress_reset(psmouse); 644 kfree(psmouse->private); 645 psmouse->private = NULL; 646 } 647 648 static int cypress_reconnect(struct psmouse *psmouse) 649 { 650 int tries = CYTP_PS2_CMD_TRIES; 651 int rc; 652 653 do { 654 cypress_reset(psmouse); 655 rc = cypress_detect(psmouse, false); 656 } while (rc && (--tries > 0)); 657 658 if (rc) { 659 psmouse_err(psmouse, "Reconnect: unable to detect trackpad.\n"); 660 return -1; 661 } 662 663 if (cypress_set_absolute_mode(psmouse)) { 664 psmouse_err(psmouse, "Reconnect: Unable to initialize Cypress absolute mode.\n"); 665 return -1; 666 } 667 668 return 0; 669 } 670 671 int cypress_init(struct psmouse *psmouse) 672 { 673 struct cytp_data *cytp; 674 675 cytp = (struct cytp_data *)kzalloc(sizeof(struct cytp_data), GFP_KERNEL); 676 psmouse->private = (void *)cytp; 677 if (cytp == NULL) 678 return -ENOMEM; 679 680 cypress_reset(psmouse); 681 682 psmouse->pktsize = 8; 683 684 if (cypress_query_hardware(psmouse)) { 685 psmouse_err(psmouse, "Unable to query Trackpad hardware.\n"); 686 goto err_exit; 687 } 688 689 if (cypress_set_absolute_mode(psmouse)) { 690 psmouse_err(psmouse, "init: Unable to initialize Cypress absolute mode.\n"); 691 goto err_exit; 692 } 693 694 if (cypress_set_input_params(psmouse->dev, cytp) < 0) { 695 psmouse_err(psmouse, "init: Unable to set input params.\n"); 696 goto err_exit; 697 } 698 699 psmouse->model = 1; 700 psmouse->protocol_handler = cypress_protocol_handler; 701 psmouse->set_rate = cypress_set_rate; 702 psmouse->disconnect = cypress_disconnect; 703 psmouse->reconnect = cypress_reconnect; 704 psmouse->cleanup = cypress_reset; 705 psmouse->resync_time = 0; 706 707 return 0; 708 709 err_exit: 710 /* 711 * Reset Cypress Trackpad as a standard mouse. Then 712 * let psmouse driver commmunicating with it as default PS2 mouse. 713 */ 714 cypress_reset(psmouse); 715 716 psmouse->private = NULL; 717 kfree(cytp); 718 719 return -1; 720 } 721 722 bool cypress_supported(void) 723 { 724 return true; 725 } 726