1 // SPDX-License-Identifier: GPL-2.0 2 /* 3 * USB Type-C Connector System Software Interface driver 4 * 5 * Copyright (C) 2017, Intel Corporation 6 * Author: Heikki Krogerus <heikki.krogerus@linux.intel.com> 7 */ 8 9 #include <linux/completion.h> 10 #include <linux/property.h> 11 #include <linux/device.h> 12 #include <linux/module.h> 13 #include <linux/delay.h> 14 #include <linux/slab.h> 15 #include <linux/usb/typec_dp.h> 16 17 #include "ucsi.h" 18 #include "trace.h" 19 20 /* 21 * UCSI_TIMEOUT_MS - PPM communication timeout 22 * 23 * Ideally we could use MIN_TIME_TO_RESPOND_WITH_BUSY (which is defined in UCSI 24 * specification) here as reference, but unfortunately we can't. It is very 25 * difficult to estimate the time it takes for the system to process the command 26 * before it is actually passed to the PPM. 27 */ 28 #define UCSI_TIMEOUT_MS 5000 29 30 /* 31 * UCSI_SWAP_TIMEOUT_MS - Timeout for role swap requests 32 * 33 * 5 seconds is close to the time it takes for CapsCounter to reach 0, so even 34 * if the PPM does not generate Connector Change events before that with 35 * partners that do not support USB Power Delivery, this should still work. 36 */ 37 #define UCSI_SWAP_TIMEOUT_MS 5000 38 39 static int ucsi_acknowledge_command(struct ucsi *ucsi) 40 { 41 u64 ctrl; 42 43 ctrl = UCSI_ACK_CC_CI; 44 ctrl |= UCSI_ACK_COMMAND_COMPLETE; 45 46 return ucsi->ops->sync_write(ucsi, UCSI_CONTROL, &ctrl, sizeof(ctrl)); 47 } 48 49 static int ucsi_acknowledge_connector_change(struct ucsi *ucsi) 50 { 51 u64 ctrl; 52 53 ctrl = UCSI_ACK_CC_CI; 54 ctrl |= UCSI_ACK_CONNECTOR_CHANGE; 55 56 return ucsi->ops->sync_write(ucsi, UCSI_CONTROL, &ctrl, sizeof(ctrl)); 57 } 58 59 static int ucsi_exec_command(struct ucsi *ucsi, u64 command); 60 61 static int ucsi_read_error(struct ucsi *ucsi) 62 { 63 u16 error; 64 int ret; 65 66 /* Acknowledge the command that failed */ 67 ret = ucsi_acknowledge_command(ucsi); 68 if (ret) 69 return ret; 70 71 ret = ucsi_exec_command(ucsi, UCSI_GET_ERROR_STATUS); 72 if (ret < 0) 73 return ret; 74 75 ret = ucsi->ops->read(ucsi, UCSI_MESSAGE_IN, &error, sizeof(error)); 76 if (ret) 77 return ret; 78 79 ret = ucsi_acknowledge_command(ucsi); 80 if (ret) 81 return ret; 82 83 switch (error) { 84 case UCSI_ERROR_INCOMPATIBLE_PARTNER: 85 return -EOPNOTSUPP; 86 case UCSI_ERROR_CC_COMMUNICATION_ERR: 87 return -ECOMM; 88 case UCSI_ERROR_CONTRACT_NEGOTIATION_FAIL: 89 return -EPROTO; 90 case UCSI_ERROR_DEAD_BATTERY: 91 dev_warn(ucsi->dev, "Dead battery condition!\n"); 92 return -EPERM; 93 case UCSI_ERROR_INVALID_CON_NUM: 94 case UCSI_ERROR_UNREGONIZED_CMD: 95 case UCSI_ERROR_INVALID_CMD_ARGUMENT: 96 dev_err(ucsi->dev, "possible UCSI driver bug %u\n", error); 97 return -EINVAL; 98 case UCSI_ERROR_OVERCURRENT: 99 dev_warn(ucsi->dev, "Overcurrent condition\n"); 100 break; 101 case UCSI_ERROR_PARTNER_REJECTED_SWAP: 102 dev_warn(ucsi->dev, "Partner rejected swap\n"); 103 break; 104 case UCSI_ERROR_HARD_RESET: 105 dev_warn(ucsi->dev, "Hard reset occurred\n"); 106 break; 107 case UCSI_ERROR_PPM_POLICY_CONFLICT: 108 dev_warn(ucsi->dev, "PPM Policy conflict\n"); 109 break; 110 case UCSI_ERROR_SWAP_REJECTED: 111 dev_warn(ucsi->dev, "Swap rejected\n"); 112 break; 113 case UCSI_ERROR_UNDEFINED: 114 default: 115 dev_err(ucsi->dev, "unknown error %u\n", error); 116 break; 117 } 118 119 return -EIO; 120 } 121 122 static int ucsi_exec_command(struct ucsi *ucsi, u64 cmd) 123 { 124 u32 cci; 125 int ret; 126 127 ret = ucsi->ops->sync_write(ucsi, UCSI_CONTROL, &cmd, sizeof(cmd)); 128 if (ret) 129 return ret; 130 131 ret = ucsi->ops->read(ucsi, UCSI_CCI, &cci, sizeof(cci)); 132 if (ret) 133 return ret; 134 135 if (cmd != UCSI_CANCEL && cci & UCSI_CCI_BUSY) 136 return ucsi_exec_command(ucsi, UCSI_CANCEL); 137 138 if (!(cci & UCSI_CCI_COMMAND_COMPLETE)) 139 return -EIO; 140 141 if (cci & UCSI_CCI_NOT_SUPPORTED) 142 return -EOPNOTSUPP; 143 144 if (cci & UCSI_CCI_ERROR) { 145 if (cmd == UCSI_GET_ERROR_STATUS) 146 return -EIO; 147 return ucsi_read_error(ucsi); 148 } 149 150 if (cmd == UCSI_CANCEL && cci & UCSI_CCI_CANCEL_COMPLETE) { 151 ret = ucsi_acknowledge_command(ucsi); 152 return ret ? ret : -EBUSY; 153 } 154 155 return UCSI_CCI_LENGTH(cci); 156 } 157 158 int ucsi_send_command(struct ucsi *ucsi, u64 command, 159 void *data, size_t size) 160 { 161 u8 length; 162 int ret; 163 164 mutex_lock(&ucsi->ppm_lock); 165 166 ret = ucsi_exec_command(ucsi, command); 167 if (ret < 0) 168 goto out; 169 170 length = ret; 171 172 if (data) { 173 ret = ucsi->ops->read(ucsi, UCSI_MESSAGE_IN, data, size); 174 if (ret) 175 goto out; 176 } 177 178 ret = ucsi_acknowledge_command(ucsi); 179 if (ret) 180 goto out; 181 182 ret = length; 183 out: 184 mutex_unlock(&ucsi->ppm_lock); 185 return ret; 186 } 187 EXPORT_SYMBOL_GPL(ucsi_send_command); 188 189 /* -------------------------------------------------------------------------- */ 190 191 struct ucsi_work { 192 struct delayed_work work; 193 struct list_head node; 194 unsigned long delay; 195 unsigned int count; 196 struct ucsi_connector *con; 197 int (*cb)(struct ucsi_connector *); 198 }; 199 200 static void ucsi_poll_worker(struct work_struct *work) 201 { 202 struct ucsi_work *uwork = container_of(work, struct ucsi_work, work.work); 203 struct ucsi_connector *con = uwork->con; 204 int ret; 205 206 mutex_lock(&con->lock); 207 208 if (!con->partner) { 209 list_del(&uwork->node); 210 mutex_unlock(&con->lock); 211 kfree(uwork); 212 return; 213 } 214 215 ret = uwork->cb(con); 216 217 if (uwork->count-- && (ret == -EBUSY || ret == -ETIMEDOUT)) { 218 queue_delayed_work(con->wq, &uwork->work, uwork->delay); 219 } else { 220 list_del(&uwork->node); 221 kfree(uwork); 222 } 223 224 mutex_unlock(&con->lock); 225 } 226 227 static int ucsi_partner_task(struct ucsi_connector *con, 228 int (*cb)(struct ucsi_connector *), 229 int retries, unsigned long delay) 230 { 231 struct ucsi_work *uwork; 232 233 if (!con->partner) 234 return 0; 235 236 uwork = kzalloc(sizeof(*uwork), GFP_KERNEL); 237 if (!uwork) 238 return -ENOMEM; 239 240 INIT_DELAYED_WORK(&uwork->work, ucsi_poll_worker); 241 uwork->count = retries; 242 uwork->delay = delay; 243 uwork->con = con; 244 uwork->cb = cb; 245 246 list_add_tail(&uwork->node, &con->partner_tasks); 247 queue_delayed_work(con->wq, &uwork->work, delay); 248 249 return 0; 250 } 251 252 /* -------------------------------------------------------------------------- */ 253 254 void ucsi_altmode_update_active(struct ucsi_connector *con) 255 { 256 const struct typec_altmode *altmode = NULL; 257 u64 command; 258 int ret; 259 u8 cur; 260 int i; 261 262 command = UCSI_GET_CURRENT_CAM | UCSI_CONNECTOR_NUMBER(con->num); 263 ret = ucsi_send_command(con->ucsi, command, &cur, sizeof(cur)); 264 if (ret < 0) { 265 if (con->ucsi->version > 0x0100) { 266 dev_err(con->ucsi->dev, 267 "GET_CURRENT_CAM command failed\n"); 268 return; 269 } 270 cur = 0xff; 271 } 272 273 if (cur < UCSI_MAX_ALTMODES) 274 altmode = typec_altmode_get_partner(con->port_altmode[cur]); 275 276 for (i = 0; con->partner_altmode[i]; i++) 277 typec_altmode_update_active(con->partner_altmode[i], 278 con->partner_altmode[i] == altmode); 279 } 280 281 static int ucsi_altmode_next_mode(struct typec_altmode **alt, u16 svid) 282 { 283 u8 mode = 1; 284 int i; 285 286 for (i = 0; alt[i]; i++) { 287 if (i > MODE_DISCOVERY_MAX) 288 return -ERANGE; 289 290 if (alt[i]->svid == svid) 291 mode++; 292 } 293 294 return mode; 295 } 296 297 static int ucsi_next_altmode(struct typec_altmode **alt) 298 { 299 int i = 0; 300 301 for (i = 0; i < UCSI_MAX_ALTMODES; i++) 302 if (!alt[i]) 303 return i; 304 305 return -ENOENT; 306 } 307 308 static int ucsi_get_num_altmode(struct typec_altmode **alt) 309 { 310 int i; 311 312 for (i = 0; i < UCSI_MAX_ALTMODES; i++) 313 if (!alt[i]) 314 break; 315 316 return i; 317 } 318 319 static int ucsi_register_altmode(struct ucsi_connector *con, 320 struct typec_altmode_desc *desc, 321 u8 recipient) 322 { 323 struct typec_altmode *alt; 324 bool override; 325 int ret; 326 int i; 327 328 override = !!(con->ucsi->cap.features & UCSI_CAP_ALT_MODE_OVERRIDE); 329 330 switch (recipient) { 331 case UCSI_RECIPIENT_CON: 332 i = ucsi_next_altmode(con->port_altmode); 333 if (i < 0) { 334 ret = i; 335 goto err; 336 } 337 338 ret = ucsi_altmode_next_mode(con->port_altmode, desc->svid); 339 if (ret < 0) 340 return ret; 341 342 desc->mode = ret; 343 344 switch (desc->svid) { 345 case USB_TYPEC_DP_SID: 346 alt = ucsi_register_displayport(con, override, i, desc); 347 break; 348 case USB_TYPEC_NVIDIA_VLINK_SID: 349 if (desc->vdo == USB_TYPEC_NVIDIA_VLINK_DBG_VDO) 350 alt = typec_port_register_altmode(con->port, 351 desc); 352 else 353 alt = ucsi_register_displayport(con, override, 354 i, desc); 355 break; 356 default: 357 alt = typec_port_register_altmode(con->port, desc); 358 break; 359 } 360 361 if (IS_ERR(alt)) { 362 ret = PTR_ERR(alt); 363 goto err; 364 } 365 366 con->port_altmode[i] = alt; 367 break; 368 case UCSI_RECIPIENT_SOP: 369 i = ucsi_next_altmode(con->partner_altmode); 370 if (i < 0) { 371 ret = i; 372 goto err; 373 } 374 375 ret = ucsi_altmode_next_mode(con->partner_altmode, desc->svid); 376 if (ret < 0) 377 return ret; 378 379 desc->mode = ret; 380 381 alt = typec_partner_register_altmode(con->partner, desc); 382 if (IS_ERR(alt)) { 383 ret = PTR_ERR(alt); 384 goto err; 385 } 386 387 con->partner_altmode[i] = alt; 388 break; 389 default: 390 return -EINVAL; 391 } 392 393 trace_ucsi_register_altmode(recipient, alt); 394 395 return 0; 396 397 err: 398 dev_err(con->ucsi->dev, "failed to registers svid 0x%04x mode %d\n", 399 desc->svid, desc->mode); 400 401 return ret; 402 } 403 404 static int 405 ucsi_register_altmodes_nvidia(struct ucsi_connector *con, u8 recipient) 406 { 407 int max_altmodes = UCSI_MAX_ALTMODES; 408 struct typec_altmode_desc desc; 409 struct ucsi_altmode alt; 410 struct ucsi_altmode orig[UCSI_MAX_ALTMODES]; 411 struct ucsi_altmode updated[UCSI_MAX_ALTMODES]; 412 struct ucsi *ucsi = con->ucsi; 413 bool multi_dp = false; 414 u64 command; 415 int ret; 416 int len; 417 int i; 418 int k = 0; 419 420 if (recipient == UCSI_RECIPIENT_CON) 421 max_altmodes = con->ucsi->cap.num_alt_modes; 422 423 memset(orig, 0, sizeof(orig)); 424 memset(updated, 0, sizeof(updated)); 425 426 /* First get all the alternate modes */ 427 for (i = 0; i < max_altmodes; i++) { 428 memset(&alt, 0, sizeof(alt)); 429 command = UCSI_GET_ALTERNATE_MODES; 430 command |= UCSI_GET_ALTMODE_RECIPIENT(recipient); 431 command |= UCSI_GET_ALTMODE_CONNECTOR_NUMBER(con->num); 432 command |= UCSI_GET_ALTMODE_OFFSET(i); 433 len = ucsi_send_command(con->ucsi, command, &alt, sizeof(alt)); 434 /* 435 * We are collecting all altmodes first and then registering. 436 * Some type-C device will return zero length data beyond last 437 * alternate modes. We should not return if length is zero. 438 */ 439 if (len < 0) 440 return len; 441 442 /* We got all altmodes, now break out and register them */ 443 if (!len || !alt.svid) 444 break; 445 446 orig[k].mid = alt.mid; 447 orig[k].svid = alt.svid; 448 k++; 449 } 450 /* 451 * Update the original altmode table as some ppms may report 452 * multiple DP altmodes. 453 */ 454 if (recipient == UCSI_RECIPIENT_CON) 455 multi_dp = ucsi->ops->update_altmodes(ucsi, orig, updated); 456 457 /* now register altmodes */ 458 for (i = 0; i < max_altmodes; i++) { 459 memset(&desc, 0, sizeof(desc)); 460 if (multi_dp && recipient == UCSI_RECIPIENT_CON) { 461 desc.svid = updated[i].svid; 462 desc.vdo = updated[i].mid; 463 } else { 464 desc.svid = orig[i].svid; 465 desc.vdo = orig[i].mid; 466 } 467 desc.roles = TYPEC_PORT_DRD; 468 469 if (!desc.svid) 470 return 0; 471 472 ret = ucsi_register_altmode(con, &desc, recipient); 473 if (ret) 474 return ret; 475 } 476 477 return 0; 478 } 479 480 static int ucsi_register_altmodes(struct ucsi_connector *con, u8 recipient) 481 { 482 int max_altmodes = UCSI_MAX_ALTMODES; 483 struct typec_altmode_desc desc; 484 struct ucsi_altmode alt[2]; 485 u64 command; 486 int num; 487 int ret; 488 int len; 489 int j; 490 int i; 491 492 if (!(con->ucsi->cap.features & UCSI_CAP_ALT_MODE_DETAILS)) 493 return 0; 494 495 if (recipient == UCSI_RECIPIENT_SOP && con->partner_altmode[0]) 496 return 0; 497 498 if (con->ucsi->ops->update_altmodes) 499 return ucsi_register_altmodes_nvidia(con, recipient); 500 501 if (recipient == UCSI_RECIPIENT_CON) 502 max_altmodes = con->ucsi->cap.num_alt_modes; 503 504 for (i = 0; i < max_altmodes;) { 505 memset(alt, 0, sizeof(alt)); 506 command = UCSI_GET_ALTERNATE_MODES; 507 command |= UCSI_GET_ALTMODE_RECIPIENT(recipient); 508 command |= UCSI_GET_ALTMODE_CONNECTOR_NUMBER(con->num); 509 command |= UCSI_GET_ALTMODE_OFFSET(i); 510 len = ucsi_send_command(con->ucsi, command, alt, sizeof(alt)); 511 if (len == -EBUSY) 512 continue; 513 if (len <= 0) 514 return len; 515 516 /* 517 * This code is requesting one alt mode at a time, but some PPMs 518 * may still return two. If that happens both alt modes need be 519 * registered and the offset for the next alt mode has to be 520 * incremented. 521 */ 522 num = len / sizeof(alt[0]); 523 i += num; 524 525 for (j = 0; j < num; j++) { 526 if (!alt[j].svid) 527 return 0; 528 529 memset(&desc, 0, sizeof(desc)); 530 desc.vdo = alt[j].mid; 531 desc.svid = alt[j].svid; 532 desc.roles = TYPEC_PORT_DRD; 533 534 ret = ucsi_register_altmode(con, &desc, recipient); 535 if (ret) 536 return ret; 537 } 538 } 539 540 return 0; 541 } 542 543 static void ucsi_unregister_altmodes(struct ucsi_connector *con, u8 recipient) 544 { 545 const struct typec_altmode *pdev; 546 struct typec_altmode **adev; 547 int i = 0; 548 549 switch (recipient) { 550 case UCSI_RECIPIENT_CON: 551 adev = con->port_altmode; 552 break; 553 case UCSI_RECIPIENT_SOP: 554 adev = con->partner_altmode; 555 break; 556 default: 557 return; 558 } 559 560 while (adev[i]) { 561 if (recipient == UCSI_RECIPIENT_SOP && 562 (adev[i]->svid == USB_TYPEC_DP_SID || 563 (adev[i]->svid == USB_TYPEC_NVIDIA_VLINK_SID && 564 adev[i]->vdo != USB_TYPEC_NVIDIA_VLINK_DBG_VDO))) { 565 pdev = typec_altmode_get_partner(adev[i]); 566 ucsi_displayport_remove_partner((void *)pdev); 567 } 568 typec_unregister_altmode(adev[i]); 569 adev[i++] = NULL; 570 } 571 } 572 573 static int ucsi_read_pdos(struct ucsi_connector *con, 574 enum typec_role role, int is_partner, 575 u32 *pdos, int offset, int num_pdos) 576 { 577 struct ucsi *ucsi = con->ucsi; 578 u64 command; 579 int ret; 580 581 command = UCSI_COMMAND(UCSI_GET_PDOS) | UCSI_CONNECTOR_NUMBER(con->num); 582 command |= UCSI_GET_PDOS_PARTNER_PDO(is_partner); 583 command |= UCSI_GET_PDOS_PDO_OFFSET(offset); 584 command |= UCSI_GET_PDOS_NUM_PDOS(num_pdos - 1); 585 command |= is_source(role) ? UCSI_GET_PDOS_SRC_PDOS : 0; 586 ret = ucsi_send_command(ucsi, command, pdos + offset, 587 num_pdos * sizeof(u32)); 588 if (ret < 0 && ret != -ETIMEDOUT) 589 dev_err(ucsi->dev, "UCSI_GET_PDOS failed (%d)\n", ret); 590 591 return ret; 592 } 593 594 static int ucsi_get_pdos(struct ucsi_connector *con, enum typec_role role, 595 int is_partner, u32 *pdos) 596 { 597 u8 num_pdos; 598 int ret; 599 600 /* UCSI max payload means only getting at most 4 PDOs at a time */ 601 ret = ucsi_read_pdos(con, role, is_partner, pdos, 0, UCSI_MAX_PDOS); 602 if (ret < 0) 603 return ret; 604 605 num_pdos = ret / sizeof(u32); /* number of bytes to 32-bit PDOs */ 606 if (num_pdos < UCSI_MAX_PDOS) 607 return num_pdos; 608 609 /* get the remaining PDOs, if any */ 610 ret = ucsi_read_pdos(con, role, is_partner, pdos, UCSI_MAX_PDOS, 611 PDO_MAX_OBJECTS - UCSI_MAX_PDOS); 612 if (ret < 0) 613 return ret; 614 615 return ret / sizeof(u32) + num_pdos; 616 } 617 618 static int ucsi_get_src_pdos(struct ucsi_connector *con) 619 { 620 int ret; 621 622 ret = ucsi_get_pdos(con, TYPEC_SOURCE, 1, con->src_pdos); 623 if (ret < 0) 624 return ret; 625 626 con->num_pdos = ret; 627 628 ucsi_port_psy_changed(con); 629 630 return ret; 631 } 632 633 static int ucsi_check_altmodes(struct ucsi_connector *con) 634 { 635 int ret, num_partner_am; 636 637 ret = ucsi_register_altmodes(con, UCSI_RECIPIENT_SOP); 638 if (ret && ret != -ETIMEDOUT) 639 dev_err(con->ucsi->dev, 640 "con%d: failed to register partner alt modes (%d)\n", 641 con->num, ret); 642 643 /* Ignoring the errors in this case. */ 644 if (con->partner_altmode[0]) { 645 num_partner_am = ucsi_get_num_altmode(con->partner_altmode); 646 if (num_partner_am > 0) 647 typec_partner_set_num_altmodes(con->partner, num_partner_am); 648 ucsi_altmode_update_active(con); 649 return 0; 650 } 651 652 return ret; 653 } 654 655 static int ucsi_register_partner_pdos(struct ucsi_connector *con) 656 { 657 struct usb_power_delivery_desc desc = { con->ucsi->cap.pd_version }; 658 struct usb_power_delivery_capabilities_desc caps; 659 struct usb_power_delivery_capabilities *cap; 660 int ret; 661 662 if (con->partner_pd) 663 return 0; 664 665 con->partner_pd = usb_power_delivery_register(NULL, &desc); 666 if (IS_ERR(con->partner_pd)) 667 return PTR_ERR(con->partner_pd); 668 669 ret = ucsi_get_pdos(con, TYPEC_SOURCE, 1, caps.pdo); 670 if (ret > 0) { 671 if (ret < PDO_MAX_OBJECTS) 672 caps.pdo[ret] = 0; 673 674 caps.role = TYPEC_SOURCE; 675 cap = usb_power_delivery_register_capabilities(con->partner_pd, &caps); 676 if (IS_ERR(cap)) 677 return PTR_ERR(cap); 678 679 con->partner_source_caps = cap; 680 681 ret = typec_partner_set_usb_power_delivery(con->partner, con->partner_pd); 682 if (ret) { 683 usb_power_delivery_unregister_capabilities(con->partner_source_caps); 684 return ret; 685 } 686 } 687 688 ret = ucsi_get_pdos(con, TYPEC_SINK, 1, caps.pdo); 689 if (ret > 0) { 690 if (ret < PDO_MAX_OBJECTS) 691 caps.pdo[ret] = 0; 692 693 caps.role = TYPEC_SINK; 694 695 cap = usb_power_delivery_register_capabilities(con->partner_pd, &caps); 696 if (IS_ERR(cap)) 697 return PTR_ERR(cap); 698 699 con->partner_sink_caps = cap; 700 701 ret = typec_partner_set_usb_power_delivery(con->partner, con->partner_pd); 702 if (ret) { 703 usb_power_delivery_unregister_capabilities(con->partner_sink_caps); 704 return ret; 705 } 706 } 707 708 return 0; 709 } 710 711 static void ucsi_unregister_partner_pdos(struct ucsi_connector *con) 712 { 713 usb_power_delivery_unregister_capabilities(con->partner_sink_caps); 714 con->partner_sink_caps = NULL; 715 usb_power_delivery_unregister_capabilities(con->partner_source_caps); 716 con->partner_source_caps = NULL; 717 usb_power_delivery_unregister(con->partner_pd); 718 con->partner_pd = NULL; 719 } 720 721 static void ucsi_pwr_opmode_change(struct ucsi_connector *con) 722 { 723 switch (UCSI_CONSTAT_PWR_OPMODE(con->status.flags)) { 724 case UCSI_CONSTAT_PWR_OPMODE_PD: 725 con->rdo = con->status.request_data_obj; 726 typec_set_pwr_opmode(con->port, TYPEC_PWR_MODE_PD); 727 ucsi_partner_task(con, ucsi_get_src_pdos, 30, 0); 728 ucsi_partner_task(con, ucsi_check_altmodes, 30, 0); 729 ucsi_partner_task(con, ucsi_register_partner_pdos, 1, HZ); 730 break; 731 case UCSI_CONSTAT_PWR_OPMODE_TYPEC1_5: 732 con->rdo = 0; 733 typec_set_pwr_opmode(con->port, TYPEC_PWR_MODE_1_5A); 734 break; 735 case UCSI_CONSTAT_PWR_OPMODE_TYPEC3_0: 736 con->rdo = 0; 737 typec_set_pwr_opmode(con->port, TYPEC_PWR_MODE_3_0A); 738 break; 739 default: 740 con->rdo = 0; 741 typec_set_pwr_opmode(con->port, TYPEC_PWR_MODE_USB); 742 break; 743 } 744 } 745 746 static int ucsi_register_partner(struct ucsi_connector *con) 747 { 748 u8 pwr_opmode = UCSI_CONSTAT_PWR_OPMODE(con->status.flags); 749 struct typec_partner_desc desc; 750 struct typec_partner *partner; 751 752 if (con->partner) 753 return 0; 754 755 memset(&desc, 0, sizeof(desc)); 756 757 switch (UCSI_CONSTAT_PARTNER_TYPE(con->status.flags)) { 758 case UCSI_CONSTAT_PARTNER_TYPE_DEBUG: 759 desc.accessory = TYPEC_ACCESSORY_DEBUG; 760 break; 761 case UCSI_CONSTAT_PARTNER_TYPE_AUDIO: 762 desc.accessory = TYPEC_ACCESSORY_AUDIO; 763 break; 764 default: 765 break; 766 } 767 768 desc.usb_pd = pwr_opmode == UCSI_CONSTAT_PWR_OPMODE_PD; 769 770 partner = typec_register_partner(con->port, &desc); 771 if (IS_ERR(partner)) { 772 dev_err(con->ucsi->dev, 773 "con%d: failed to register partner (%ld)\n", con->num, 774 PTR_ERR(partner)); 775 return PTR_ERR(partner); 776 } 777 778 con->partner = partner; 779 780 return 0; 781 } 782 783 static void ucsi_unregister_partner(struct ucsi_connector *con) 784 { 785 if (!con->partner) 786 return; 787 788 typec_set_mode(con->port, TYPEC_STATE_SAFE); 789 790 ucsi_unregister_partner_pdos(con); 791 ucsi_unregister_altmodes(con, UCSI_RECIPIENT_SOP); 792 typec_unregister_partner(con->partner); 793 con->partner = NULL; 794 } 795 796 static void ucsi_partner_change(struct ucsi_connector *con) 797 { 798 enum usb_role u_role = USB_ROLE_NONE; 799 int ret; 800 801 switch (UCSI_CONSTAT_PARTNER_TYPE(con->status.flags)) { 802 case UCSI_CONSTAT_PARTNER_TYPE_UFP: 803 case UCSI_CONSTAT_PARTNER_TYPE_CABLE_AND_UFP: 804 u_role = USB_ROLE_HOST; 805 fallthrough; 806 case UCSI_CONSTAT_PARTNER_TYPE_CABLE: 807 typec_set_data_role(con->port, TYPEC_HOST); 808 break; 809 case UCSI_CONSTAT_PARTNER_TYPE_DFP: 810 u_role = USB_ROLE_DEVICE; 811 typec_set_data_role(con->port, TYPEC_DEVICE); 812 break; 813 default: 814 break; 815 } 816 817 if (con->status.flags & UCSI_CONSTAT_CONNECTED) { 818 switch (UCSI_CONSTAT_PARTNER_TYPE(con->status.flags)) { 819 case UCSI_CONSTAT_PARTNER_TYPE_DEBUG: 820 typec_set_mode(con->port, TYPEC_MODE_DEBUG); 821 break; 822 case UCSI_CONSTAT_PARTNER_TYPE_AUDIO: 823 typec_set_mode(con->port, TYPEC_MODE_AUDIO); 824 break; 825 default: 826 if (UCSI_CONSTAT_PARTNER_FLAGS(con->status.flags) == 827 UCSI_CONSTAT_PARTNER_FLAG_USB) 828 typec_set_mode(con->port, TYPEC_STATE_USB); 829 } 830 } 831 832 /* Only notify USB controller if partner supports USB data */ 833 if (!(UCSI_CONSTAT_PARTNER_FLAGS(con->status.flags) & UCSI_CONSTAT_PARTNER_FLAG_USB)) 834 u_role = USB_ROLE_NONE; 835 836 ret = usb_role_switch_set_role(con->usb_role_sw, u_role); 837 if (ret) 838 dev_err(con->ucsi->dev, "con:%d: failed to set usb role:%d\n", 839 con->num, u_role); 840 } 841 842 static int ucsi_check_connection(struct ucsi_connector *con) 843 { 844 u8 prev_flags = con->status.flags; 845 u64 command; 846 int ret; 847 848 command = UCSI_GET_CONNECTOR_STATUS | UCSI_CONNECTOR_NUMBER(con->num); 849 ret = ucsi_send_command(con->ucsi, command, &con->status, sizeof(con->status)); 850 if (ret < 0) { 851 dev_err(con->ucsi->dev, "GET_CONNECTOR_STATUS failed (%d)\n", ret); 852 return ret; 853 } 854 855 if (con->status.flags == prev_flags) 856 return 0; 857 858 if (con->status.flags & UCSI_CONSTAT_CONNECTED) { 859 ucsi_register_partner(con); 860 ucsi_pwr_opmode_change(con); 861 ucsi_partner_change(con); 862 } else { 863 ucsi_partner_change(con); 864 ucsi_port_psy_changed(con); 865 ucsi_unregister_partner(con); 866 } 867 868 return 0; 869 } 870 871 static void ucsi_handle_connector_change(struct work_struct *work) 872 { 873 struct ucsi_connector *con = container_of(work, struct ucsi_connector, 874 work); 875 struct ucsi *ucsi = con->ucsi; 876 enum typec_role role; 877 u64 command; 878 int ret; 879 880 mutex_lock(&con->lock); 881 882 command = UCSI_GET_CONNECTOR_STATUS | UCSI_CONNECTOR_NUMBER(con->num); 883 ret = ucsi_send_command(ucsi, command, &con->status, sizeof(con->status)); 884 if (ret < 0) { 885 dev_err(ucsi->dev, "%s: GET_CONNECTOR_STATUS failed (%d)\n", 886 __func__, ret); 887 goto out_unlock; 888 } 889 890 trace_ucsi_connector_change(con->num, &con->status); 891 892 role = !!(con->status.flags & UCSI_CONSTAT_PWR_DIR); 893 894 if (con->status.change & UCSI_CONSTAT_POWER_DIR_CHANGE) { 895 typec_set_pwr_role(con->port, role); 896 897 /* Complete pending power role swap */ 898 if (!completion_done(&con->complete)) 899 complete(&con->complete); 900 } 901 902 if (con->status.change & UCSI_CONSTAT_CONNECT_CHANGE) { 903 typec_set_pwr_role(con->port, role); 904 ucsi_port_psy_changed(con); 905 ucsi_partner_change(con); 906 907 if (con->status.flags & UCSI_CONSTAT_CONNECTED) { 908 ucsi_register_partner(con); 909 ucsi_partner_task(con, ucsi_check_connection, 1, HZ); 910 911 if (UCSI_CONSTAT_PWR_OPMODE(con->status.flags) == 912 UCSI_CONSTAT_PWR_OPMODE_PD) 913 ucsi_partner_task(con, ucsi_register_partner_pdos, 1, HZ); 914 } else { 915 ucsi_unregister_partner(con); 916 } 917 } 918 919 if (con->status.change & UCSI_CONSTAT_POWER_OPMODE_CHANGE || 920 con->status.change & UCSI_CONSTAT_POWER_LEVEL_CHANGE) 921 ucsi_pwr_opmode_change(con); 922 923 if (con->partner && con->status.change & UCSI_CONSTAT_PARTNER_CHANGE) { 924 ucsi_partner_change(con); 925 926 /* Complete pending data role swap */ 927 if (!completion_done(&con->complete)) 928 complete(&con->complete); 929 } 930 931 if (con->status.change & UCSI_CONSTAT_CAM_CHANGE) 932 ucsi_partner_task(con, ucsi_check_altmodes, 1, 0); 933 934 clear_bit(EVENT_PENDING, &con->ucsi->flags); 935 936 ret = ucsi_acknowledge_connector_change(ucsi); 937 if (ret) 938 dev_err(ucsi->dev, "%s: ACK failed (%d)", __func__, ret); 939 940 out_unlock: 941 mutex_unlock(&con->lock); 942 } 943 944 /** 945 * ucsi_connector_change - Process Connector Change Event 946 * @ucsi: UCSI Interface 947 * @num: Connector number 948 */ 949 void ucsi_connector_change(struct ucsi *ucsi, u8 num) 950 { 951 struct ucsi_connector *con = &ucsi->connector[num - 1]; 952 953 if (!(ucsi->ntfy & UCSI_ENABLE_NTFY_CONNECTOR_CHANGE)) { 954 dev_dbg(ucsi->dev, "Bogus connector change event\n"); 955 return; 956 } 957 958 if (!test_and_set_bit(EVENT_PENDING, &ucsi->flags)) 959 schedule_work(&con->work); 960 } 961 EXPORT_SYMBOL_GPL(ucsi_connector_change); 962 963 /* -------------------------------------------------------------------------- */ 964 965 static int ucsi_reset_connector(struct ucsi_connector *con, bool hard) 966 { 967 u64 command; 968 969 command = UCSI_CONNECTOR_RESET | UCSI_CONNECTOR_NUMBER(con->num); 970 command |= hard ? UCSI_CONNECTOR_RESET_HARD : 0; 971 972 return ucsi_send_command(con->ucsi, command, NULL, 0); 973 } 974 975 static int ucsi_reset_ppm(struct ucsi *ucsi) 976 { 977 u64 command = UCSI_PPM_RESET; 978 unsigned long tmo; 979 u32 cci; 980 int ret; 981 982 mutex_lock(&ucsi->ppm_lock); 983 984 ret = ucsi->ops->async_write(ucsi, UCSI_CONTROL, &command, 985 sizeof(command)); 986 if (ret < 0) 987 goto out; 988 989 tmo = jiffies + msecs_to_jiffies(UCSI_TIMEOUT_MS); 990 991 do { 992 if (time_is_before_jiffies(tmo)) { 993 ret = -ETIMEDOUT; 994 goto out; 995 } 996 997 ret = ucsi->ops->read(ucsi, UCSI_CCI, &cci, sizeof(cci)); 998 if (ret) 999 goto out; 1000 1001 /* If the PPM is still doing something else, reset it again. */ 1002 if (cci & ~UCSI_CCI_RESET_COMPLETE) { 1003 ret = ucsi->ops->async_write(ucsi, UCSI_CONTROL, 1004 &command, 1005 sizeof(command)); 1006 if (ret < 0) 1007 goto out; 1008 } 1009 1010 msleep(20); 1011 } while (!(cci & UCSI_CCI_RESET_COMPLETE)); 1012 1013 out: 1014 mutex_unlock(&ucsi->ppm_lock); 1015 return ret; 1016 } 1017 1018 static int ucsi_role_cmd(struct ucsi_connector *con, u64 command) 1019 { 1020 int ret; 1021 1022 ret = ucsi_send_command(con->ucsi, command, NULL, 0); 1023 if (ret == -ETIMEDOUT) { 1024 u64 c; 1025 1026 /* PPM most likely stopped responding. Resetting everything. */ 1027 ucsi_reset_ppm(con->ucsi); 1028 1029 c = UCSI_SET_NOTIFICATION_ENABLE | con->ucsi->ntfy; 1030 ucsi_send_command(con->ucsi, c, NULL, 0); 1031 1032 ucsi_reset_connector(con, true); 1033 } 1034 1035 return ret; 1036 } 1037 1038 static int ucsi_dr_swap(struct typec_port *port, enum typec_data_role role) 1039 { 1040 struct ucsi_connector *con = typec_get_drvdata(port); 1041 u8 partner_type; 1042 u64 command; 1043 int ret = 0; 1044 1045 mutex_lock(&con->lock); 1046 1047 if (!con->partner) { 1048 ret = -ENOTCONN; 1049 goto out_unlock; 1050 } 1051 1052 partner_type = UCSI_CONSTAT_PARTNER_TYPE(con->status.flags); 1053 if ((partner_type == UCSI_CONSTAT_PARTNER_TYPE_DFP && 1054 role == TYPEC_DEVICE) || 1055 (partner_type == UCSI_CONSTAT_PARTNER_TYPE_UFP && 1056 role == TYPEC_HOST)) 1057 goto out_unlock; 1058 1059 reinit_completion(&con->complete); 1060 1061 command = UCSI_SET_UOR | UCSI_CONNECTOR_NUMBER(con->num); 1062 command |= UCSI_SET_UOR_ROLE(role); 1063 command |= UCSI_SET_UOR_ACCEPT_ROLE_SWAPS; 1064 ret = ucsi_role_cmd(con, command); 1065 if (ret < 0) 1066 goto out_unlock; 1067 1068 mutex_unlock(&con->lock); 1069 1070 if (!wait_for_completion_timeout(&con->complete, 1071 msecs_to_jiffies(UCSI_SWAP_TIMEOUT_MS))) 1072 return -ETIMEDOUT; 1073 1074 return 0; 1075 1076 out_unlock: 1077 mutex_unlock(&con->lock); 1078 1079 return ret; 1080 } 1081 1082 static int ucsi_pr_swap(struct typec_port *port, enum typec_role role) 1083 { 1084 struct ucsi_connector *con = typec_get_drvdata(port); 1085 enum typec_role cur_role; 1086 u64 command; 1087 int ret = 0; 1088 1089 mutex_lock(&con->lock); 1090 1091 if (!con->partner) { 1092 ret = -ENOTCONN; 1093 goto out_unlock; 1094 } 1095 1096 cur_role = !!(con->status.flags & UCSI_CONSTAT_PWR_DIR); 1097 1098 if (cur_role == role) 1099 goto out_unlock; 1100 1101 reinit_completion(&con->complete); 1102 1103 command = UCSI_SET_PDR | UCSI_CONNECTOR_NUMBER(con->num); 1104 command |= UCSI_SET_PDR_ROLE(role); 1105 command |= UCSI_SET_PDR_ACCEPT_ROLE_SWAPS; 1106 ret = ucsi_role_cmd(con, command); 1107 if (ret < 0) 1108 goto out_unlock; 1109 1110 mutex_unlock(&con->lock); 1111 1112 if (!wait_for_completion_timeout(&con->complete, 1113 msecs_to_jiffies(UCSI_SWAP_TIMEOUT_MS))) 1114 return -ETIMEDOUT; 1115 1116 mutex_lock(&con->lock); 1117 1118 /* Something has gone wrong while swapping the role */ 1119 if (UCSI_CONSTAT_PWR_OPMODE(con->status.flags) != 1120 UCSI_CONSTAT_PWR_OPMODE_PD) { 1121 ucsi_reset_connector(con, true); 1122 ret = -EPROTO; 1123 } 1124 1125 out_unlock: 1126 mutex_unlock(&con->lock); 1127 1128 return ret; 1129 } 1130 1131 static const struct typec_operations ucsi_ops = { 1132 .dr_set = ucsi_dr_swap, 1133 .pr_set = ucsi_pr_swap 1134 }; 1135 1136 /* Caller must call fwnode_handle_put() after use */ 1137 static struct fwnode_handle *ucsi_find_fwnode(struct ucsi_connector *con) 1138 { 1139 struct fwnode_handle *fwnode; 1140 int i = 1; 1141 1142 device_for_each_child_node(con->ucsi->dev, fwnode) 1143 if (i++ == con->num) 1144 return fwnode; 1145 return NULL; 1146 } 1147 1148 static int ucsi_register_port(struct ucsi *ucsi, struct ucsi_connector *con) 1149 { 1150 struct usb_power_delivery_desc desc = { ucsi->cap.pd_version}; 1151 struct usb_power_delivery_capabilities_desc pd_caps; 1152 struct usb_power_delivery_capabilities *pd_cap; 1153 struct typec_capability *cap = &con->typec_cap; 1154 enum typec_accessory *accessory = cap->accessory; 1155 enum usb_role u_role = USB_ROLE_NONE; 1156 u64 command; 1157 char *name; 1158 int ret; 1159 1160 name = kasprintf(GFP_KERNEL, "%s-con%d", dev_name(ucsi->dev), con->num); 1161 if (!name) 1162 return -ENOMEM; 1163 1164 con->wq = create_singlethread_workqueue(name); 1165 kfree(name); 1166 if (!con->wq) 1167 return -ENOMEM; 1168 1169 INIT_WORK(&con->work, ucsi_handle_connector_change); 1170 init_completion(&con->complete); 1171 mutex_init(&con->lock); 1172 INIT_LIST_HEAD(&con->partner_tasks); 1173 con->ucsi = ucsi; 1174 1175 cap->fwnode = ucsi_find_fwnode(con); 1176 con->usb_role_sw = fwnode_usb_role_switch_get(cap->fwnode); 1177 if (IS_ERR(con->usb_role_sw)) 1178 return dev_err_probe(ucsi->dev, PTR_ERR(con->usb_role_sw), 1179 "con%d: failed to get usb role switch\n", con->num); 1180 1181 /* Delay other interactions with the con until registration is complete */ 1182 mutex_lock(&con->lock); 1183 1184 /* Get connector capability */ 1185 command = UCSI_GET_CONNECTOR_CAPABILITY; 1186 command |= UCSI_CONNECTOR_NUMBER(con->num); 1187 ret = ucsi_send_command(ucsi, command, &con->cap, sizeof(con->cap)); 1188 if (ret < 0) 1189 goto out_unlock; 1190 1191 if (con->cap.op_mode & UCSI_CONCAP_OPMODE_DRP) 1192 cap->data = TYPEC_PORT_DRD; 1193 else if (con->cap.op_mode & UCSI_CONCAP_OPMODE_DFP) 1194 cap->data = TYPEC_PORT_DFP; 1195 else if (con->cap.op_mode & UCSI_CONCAP_OPMODE_UFP) 1196 cap->data = TYPEC_PORT_UFP; 1197 1198 if ((con->cap.flags & UCSI_CONCAP_FLAG_PROVIDER) && 1199 (con->cap.flags & UCSI_CONCAP_FLAG_CONSUMER)) 1200 cap->type = TYPEC_PORT_DRP; 1201 else if (con->cap.flags & UCSI_CONCAP_FLAG_PROVIDER) 1202 cap->type = TYPEC_PORT_SRC; 1203 else if (con->cap.flags & UCSI_CONCAP_FLAG_CONSUMER) 1204 cap->type = TYPEC_PORT_SNK; 1205 1206 cap->revision = ucsi->cap.typec_version; 1207 cap->pd_revision = ucsi->cap.pd_version; 1208 cap->svdm_version = SVDM_VER_2_0; 1209 cap->prefer_role = TYPEC_NO_PREFERRED_ROLE; 1210 1211 if (con->cap.op_mode & UCSI_CONCAP_OPMODE_AUDIO_ACCESSORY) 1212 *accessory++ = TYPEC_ACCESSORY_AUDIO; 1213 if (con->cap.op_mode & UCSI_CONCAP_OPMODE_DEBUG_ACCESSORY) 1214 *accessory = TYPEC_ACCESSORY_DEBUG; 1215 1216 cap->driver_data = con; 1217 cap->ops = &ucsi_ops; 1218 1219 ret = ucsi_register_port_psy(con); 1220 if (ret) 1221 goto out; 1222 1223 /* Register the connector */ 1224 con->port = typec_register_port(ucsi->dev, cap); 1225 if (IS_ERR(con->port)) { 1226 ret = PTR_ERR(con->port); 1227 goto out; 1228 } 1229 1230 con->pd = usb_power_delivery_register(ucsi->dev, &desc); 1231 1232 ret = ucsi_get_pdos(con, TYPEC_SOURCE, 0, pd_caps.pdo); 1233 if (ret > 0) { 1234 if (ret < PDO_MAX_OBJECTS) 1235 pd_caps.pdo[ret] = 0; 1236 1237 pd_caps.role = TYPEC_SOURCE; 1238 pd_cap = usb_power_delivery_register_capabilities(con->pd, &pd_caps); 1239 if (IS_ERR(pd_cap)) { 1240 ret = PTR_ERR(pd_cap); 1241 goto out; 1242 } 1243 1244 con->port_source_caps = pd_cap; 1245 typec_port_set_usb_power_delivery(con->port, con->pd); 1246 } 1247 1248 memset(&pd_caps, 0, sizeof(pd_caps)); 1249 ret = ucsi_get_pdos(con, TYPEC_SINK, 0, pd_caps.pdo); 1250 if (ret > 0) { 1251 if (ret < PDO_MAX_OBJECTS) 1252 pd_caps.pdo[ret] = 0; 1253 1254 pd_caps.role = TYPEC_SINK; 1255 pd_cap = usb_power_delivery_register_capabilities(con->pd, &pd_caps); 1256 if (IS_ERR(pd_cap)) { 1257 ret = PTR_ERR(pd_cap); 1258 goto out; 1259 } 1260 1261 con->port_sink_caps = pd_cap; 1262 typec_port_set_usb_power_delivery(con->port, con->pd); 1263 } 1264 1265 /* Alternate modes */ 1266 ret = ucsi_register_altmodes(con, UCSI_RECIPIENT_CON); 1267 if (ret) { 1268 dev_err(ucsi->dev, "con%d: failed to register alt modes\n", 1269 con->num); 1270 goto out; 1271 } 1272 1273 /* Get the status */ 1274 command = UCSI_GET_CONNECTOR_STATUS | UCSI_CONNECTOR_NUMBER(con->num); 1275 ret = ucsi_send_command(ucsi, command, &con->status, sizeof(con->status)); 1276 if (ret < 0) { 1277 dev_err(ucsi->dev, "con%d: failed to get status\n", con->num); 1278 ret = 0; 1279 goto out; 1280 } 1281 ret = 0; /* ucsi_send_command() returns length on success */ 1282 1283 switch (UCSI_CONSTAT_PARTNER_TYPE(con->status.flags)) { 1284 case UCSI_CONSTAT_PARTNER_TYPE_UFP: 1285 case UCSI_CONSTAT_PARTNER_TYPE_CABLE_AND_UFP: 1286 u_role = USB_ROLE_HOST; 1287 fallthrough; 1288 case UCSI_CONSTAT_PARTNER_TYPE_CABLE: 1289 typec_set_data_role(con->port, TYPEC_HOST); 1290 break; 1291 case UCSI_CONSTAT_PARTNER_TYPE_DFP: 1292 u_role = USB_ROLE_DEVICE; 1293 typec_set_data_role(con->port, TYPEC_DEVICE); 1294 break; 1295 default: 1296 break; 1297 } 1298 1299 /* Check if there is already something connected */ 1300 if (con->status.flags & UCSI_CONSTAT_CONNECTED) { 1301 typec_set_pwr_role(con->port, 1302 !!(con->status.flags & UCSI_CONSTAT_PWR_DIR)); 1303 ucsi_register_partner(con); 1304 ucsi_pwr_opmode_change(con); 1305 ucsi_port_psy_changed(con); 1306 } 1307 1308 /* Only notify USB controller if partner supports USB data */ 1309 if (!(UCSI_CONSTAT_PARTNER_FLAGS(con->status.flags) & UCSI_CONSTAT_PARTNER_FLAG_USB)) 1310 u_role = USB_ROLE_NONE; 1311 1312 ret = usb_role_switch_set_role(con->usb_role_sw, u_role); 1313 if (ret) { 1314 dev_err(ucsi->dev, "con:%d: failed to set usb role:%d\n", 1315 con->num, u_role); 1316 ret = 0; 1317 } 1318 1319 if (con->partner && 1320 UCSI_CONSTAT_PWR_OPMODE(con->status.flags) == 1321 UCSI_CONSTAT_PWR_OPMODE_PD) { 1322 ucsi_get_src_pdos(con); 1323 ucsi_check_altmodes(con); 1324 } 1325 1326 trace_ucsi_register_port(con->num, &con->status); 1327 1328 out: 1329 fwnode_handle_put(cap->fwnode); 1330 out_unlock: 1331 mutex_unlock(&con->lock); 1332 1333 if (ret && con->wq) { 1334 destroy_workqueue(con->wq); 1335 con->wq = NULL; 1336 } 1337 1338 return ret; 1339 } 1340 1341 /** 1342 * ucsi_init - Initialize UCSI interface 1343 * @ucsi: UCSI to be initialized 1344 * 1345 * Registers all ports @ucsi has and enables all notification events. 1346 */ 1347 static int ucsi_init(struct ucsi *ucsi) 1348 { 1349 struct ucsi_connector *con, *connector; 1350 u64 command, ntfy; 1351 int ret; 1352 int i; 1353 1354 /* Reset the PPM */ 1355 ret = ucsi_reset_ppm(ucsi); 1356 if (ret) { 1357 dev_err(ucsi->dev, "failed to reset PPM!\n"); 1358 goto err; 1359 } 1360 1361 /* Enable basic notifications */ 1362 ntfy = UCSI_ENABLE_NTFY_CMD_COMPLETE | UCSI_ENABLE_NTFY_ERROR; 1363 command = UCSI_SET_NOTIFICATION_ENABLE | ntfy; 1364 ret = ucsi_send_command(ucsi, command, NULL, 0); 1365 if (ret < 0) 1366 goto err_reset; 1367 1368 /* Get PPM capabilities */ 1369 command = UCSI_GET_CAPABILITY; 1370 ret = ucsi_send_command(ucsi, command, &ucsi->cap, sizeof(ucsi->cap)); 1371 if (ret < 0) 1372 goto err_reset; 1373 1374 if (!ucsi->cap.num_connectors) { 1375 ret = -ENODEV; 1376 goto err_reset; 1377 } 1378 1379 /* Allocate the connectors. Released in ucsi_unregister() */ 1380 connector = kcalloc(ucsi->cap.num_connectors + 1, sizeof(*connector), GFP_KERNEL); 1381 if (!connector) { 1382 ret = -ENOMEM; 1383 goto err_reset; 1384 } 1385 1386 /* Register all connectors */ 1387 for (i = 0; i < ucsi->cap.num_connectors; i++) { 1388 connector[i].num = i + 1; 1389 ret = ucsi_register_port(ucsi, &connector[i]); 1390 if (ret) 1391 goto err_unregister; 1392 } 1393 1394 /* Enable all notifications */ 1395 ntfy = UCSI_ENABLE_NTFY_ALL; 1396 command = UCSI_SET_NOTIFICATION_ENABLE | ntfy; 1397 ret = ucsi_send_command(ucsi, command, NULL, 0); 1398 if (ret < 0) 1399 goto err_unregister; 1400 1401 ucsi->connector = connector; 1402 ucsi->ntfy = ntfy; 1403 return 0; 1404 1405 err_unregister: 1406 for (con = connector; con->port; con++) { 1407 ucsi_unregister_partner(con); 1408 ucsi_unregister_altmodes(con, UCSI_RECIPIENT_CON); 1409 ucsi_unregister_port_psy(con); 1410 if (con->wq) 1411 destroy_workqueue(con->wq); 1412 1413 usb_power_delivery_unregister_capabilities(con->port_sink_caps); 1414 con->port_sink_caps = NULL; 1415 usb_power_delivery_unregister_capabilities(con->port_source_caps); 1416 con->port_source_caps = NULL; 1417 usb_power_delivery_unregister(con->pd); 1418 con->pd = NULL; 1419 typec_unregister_port(con->port); 1420 con->port = NULL; 1421 } 1422 kfree(connector); 1423 err_reset: 1424 memset(&ucsi->cap, 0, sizeof(ucsi->cap)); 1425 ucsi_reset_ppm(ucsi); 1426 err: 1427 return ret; 1428 } 1429 1430 static void ucsi_resume_work(struct work_struct *work) 1431 { 1432 struct ucsi *ucsi = container_of(work, struct ucsi, resume_work); 1433 struct ucsi_connector *con; 1434 u64 command; 1435 int ret; 1436 1437 /* Restore UCSI notification enable mask after system resume */ 1438 command = UCSI_SET_NOTIFICATION_ENABLE | ucsi->ntfy; 1439 ret = ucsi_send_command(ucsi, command, NULL, 0); 1440 if (ret < 0) { 1441 dev_err(ucsi->dev, "failed to re-enable notifications (%d)\n", ret); 1442 return; 1443 } 1444 1445 for (con = ucsi->connector; con->port; con++) { 1446 mutex_lock(&con->lock); 1447 ucsi_partner_task(con, ucsi_check_connection, 1, 0); 1448 mutex_unlock(&con->lock); 1449 } 1450 } 1451 1452 int ucsi_resume(struct ucsi *ucsi) 1453 { 1454 if (ucsi->connector) 1455 queue_work(system_long_wq, &ucsi->resume_work); 1456 return 0; 1457 } 1458 EXPORT_SYMBOL_GPL(ucsi_resume); 1459 1460 static void ucsi_init_work(struct work_struct *work) 1461 { 1462 struct ucsi *ucsi = container_of(work, struct ucsi, work.work); 1463 int ret; 1464 1465 ret = ucsi_init(ucsi); 1466 if (ret) 1467 dev_err_probe(ucsi->dev, ret, "PPM init failed\n"); 1468 1469 if (ret == -EPROBE_DEFER) { 1470 if (ucsi->work_count++ > UCSI_ROLE_SWITCH_WAIT_COUNT) { 1471 dev_err(ucsi->dev, "PPM init failed, stop trying\n"); 1472 return; 1473 } 1474 1475 queue_delayed_work(system_long_wq, &ucsi->work, 1476 UCSI_ROLE_SWITCH_INTERVAL); 1477 } 1478 } 1479 1480 /** 1481 * ucsi_get_drvdata - Return private driver data pointer 1482 * @ucsi: UCSI interface 1483 */ 1484 void *ucsi_get_drvdata(struct ucsi *ucsi) 1485 { 1486 return ucsi->driver_data; 1487 } 1488 EXPORT_SYMBOL_GPL(ucsi_get_drvdata); 1489 1490 /** 1491 * ucsi_set_drvdata - Assign private driver data pointer 1492 * @ucsi: UCSI interface 1493 * @data: Private data pointer 1494 */ 1495 void ucsi_set_drvdata(struct ucsi *ucsi, void *data) 1496 { 1497 ucsi->driver_data = data; 1498 } 1499 EXPORT_SYMBOL_GPL(ucsi_set_drvdata); 1500 1501 /** 1502 * ucsi_create - Allocate UCSI instance 1503 * @dev: Device interface to the PPM (Platform Policy Manager) 1504 * @ops: I/O routines 1505 */ 1506 struct ucsi *ucsi_create(struct device *dev, const struct ucsi_operations *ops) 1507 { 1508 struct ucsi *ucsi; 1509 1510 if (!ops || !ops->read || !ops->sync_write || !ops->async_write) 1511 return ERR_PTR(-EINVAL); 1512 1513 ucsi = kzalloc(sizeof(*ucsi), GFP_KERNEL); 1514 if (!ucsi) 1515 return ERR_PTR(-ENOMEM); 1516 1517 INIT_WORK(&ucsi->resume_work, ucsi_resume_work); 1518 INIT_DELAYED_WORK(&ucsi->work, ucsi_init_work); 1519 mutex_init(&ucsi->ppm_lock); 1520 ucsi->dev = dev; 1521 ucsi->ops = ops; 1522 1523 return ucsi; 1524 } 1525 EXPORT_SYMBOL_GPL(ucsi_create); 1526 1527 /** 1528 * ucsi_destroy - Free UCSI instance 1529 * @ucsi: UCSI instance to be freed 1530 */ 1531 void ucsi_destroy(struct ucsi *ucsi) 1532 { 1533 kfree(ucsi); 1534 } 1535 EXPORT_SYMBOL_GPL(ucsi_destroy); 1536 1537 /** 1538 * ucsi_register - Register UCSI interface 1539 * @ucsi: UCSI instance 1540 */ 1541 int ucsi_register(struct ucsi *ucsi) 1542 { 1543 int ret; 1544 1545 ret = ucsi->ops->read(ucsi, UCSI_VERSION, &ucsi->version, 1546 sizeof(ucsi->version)); 1547 if (ret) 1548 return ret; 1549 1550 if (!ucsi->version) 1551 return -ENODEV; 1552 1553 queue_delayed_work(system_long_wq, &ucsi->work, 0); 1554 1555 return 0; 1556 } 1557 EXPORT_SYMBOL_GPL(ucsi_register); 1558 1559 /** 1560 * ucsi_unregister - Unregister UCSI interface 1561 * @ucsi: UCSI interface to be unregistered 1562 * 1563 * Unregister UCSI interface that was created with ucsi_register(). 1564 */ 1565 void ucsi_unregister(struct ucsi *ucsi) 1566 { 1567 u64 cmd = UCSI_SET_NOTIFICATION_ENABLE; 1568 int i; 1569 1570 /* Make sure that we are not in the middle of driver initialization */ 1571 cancel_delayed_work_sync(&ucsi->work); 1572 cancel_work_sync(&ucsi->resume_work); 1573 1574 /* Disable notifications */ 1575 ucsi->ops->async_write(ucsi, UCSI_CONTROL, &cmd, sizeof(cmd)); 1576 1577 if (!ucsi->connector) 1578 return; 1579 1580 for (i = 0; i < ucsi->cap.num_connectors; i++) { 1581 cancel_work_sync(&ucsi->connector[i].work); 1582 ucsi_unregister_partner(&ucsi->connector[i]); 1583 ucsi_unregister_altmodes(&ucsi->connector[i], 1584 UCSI_RECIPIENT_CON); 1585 ucsi_unregister_port_psy(&ucsi->connector[i]); 1586 1587 if (ucsi->connector[i].wq) { 1588 struct ucsi_work *uwork; 1589 1590 mutex_lock(&ucsi->connector[i].lock); 1591 /* 1592 * queue delayed items immediately so they can execute 1593 * and free themselves before the wq is destroyed 1594 */ 1595 list_for_each_entry(uwork, &ucsi->connector[i].partner_tasks, node) 1596 mod_delayed_work(ucsi->connector[i].wq, &uwork->work, 0); 1597 mutex_unlock(&ucsi->connector[i].lock); 1598 destroy_workqueue(ucsi->connector[i].wq); 1599 } 1600 1601 usb_power_delivery_unregister_capabilities(ucsi->connector[i].port_sink_caps); 1602 ucsi->connector[i].port_sink_caps = NULL; 1603 usb_power_delivery_unregister_capabilities(ucsi->connector[i].port_source_caps); 1604 ucsi->connector[i].port_source_caps = NULL; 1605 usb_power_delivery_unregister(ucsi->connector[i].pd); 1606 ucsi->connector[i].pd = NULL; 1607 typec_unregister_port(ucsi->connector[i].port); 1608 } 1609 1610 kfree(ucsi->connector); 1611 } 1612 EXPORT_SYMBOL_GPL(ucsi_unregister); 1613 1614 MODULE_AUTHOR("Heikki Krogerus <heikki.krogerus@linux.intel.com>"); 1615 MODULE_LICENSE("GPL v2"); 1616 MODULE_DESCRIPTION("USB Type-C Connector System Software Interface driver"); 1617