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 } 676