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