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 typec_partner_set_usb_power_delivery(con->partner, NULL); 791 ucsi_unregister_partner_pdos(con); 792 ucsi_unregister_altmodes(con, UCSI_RECIPIENT_SOP); 793 typec_unregister_partner(con->partner); 794 con->partner = NULL; 795 } 796 797 static void ucsi_partner_change(struct ucsi_connector *con) 798 { 799 enum usb_role u_role = USB_ROLE_NONE; 800 int ret; 801 802 switch (UCSI_CONSTAT_PARTNER_TYPE(con->status.flags)) { 803 case UCSI_CONSTAT_PARTNER_TYPE_UFP: 804 case UCSI_CONSTAT_PARTNER_TYPE_CABLE_AND_UFP: 805 u_role = USB_ROLE_HOST; 806 fallthrough; 807 case UCSI_CONSTAT_PARTNER_TYPE_CABLE: 808 typec_set_data_role(con->port, TYPEC_HOST); 809 break; 810 case UCSI_CONSTAT_PARTNER_TYPE_DFP: 811 u_role = USB_ROLE_DEVICE; 812 typec_set_data_role(con->port, TYPEC_DEVICE); 813 break; 814 default: 815 break; 816 } 817 818 if (con->status.flags & UCSI_CONSTAT_CONNECTED) { 819 switch (UCSI_CONSTAT_PARTNER_TYPE(con->status.flags)) { 820 case UCSI_CONSTAT_PARTNER_TYPE_DEBUG: 821 typec_set_mode(con->port, TYPEC_MODE_DEBUG); 822 break; 823 case UCSI_CONSTAT_PARTNER_TYPE_AUDIO: 824 typec_set_mode(con->port, TYPEC_MODE_AUDIO); 825 break; 826 default: 827 if (UCSI_CONSTAT_PARTNER_FLAGS(con->status.flags) == 828 UCSI_CONSTAT_PARTNER_FLAG_USB) 829 typec_set_mode(con->port, TYPEC_STATE_USB); 830 } 831 } 832 833 /* Only notify USB controller if partner supports USB data */ 834 if (!(UCSI_CONSTAT_PARTNER_FLAGS(con->status.flags) & UCSI_CONSTAT_PARTNER_FLAG_USB)) 835 u_role = USB_ROLE_NONE; 836 837 ret = usb_role_switch_set_role(con->usb_role_sw, u_role); 838 if (ret) 839 dev_err(con->ucsi->dev, "con:%d: failed to set usb role:%d\n", 840 con->num, u_role); 841 } 842 843 static int ucsi_check_connection(struct ucsi_connector *con) 844 { 845 u8 prev_flags = con->status.flags; 846 u64 command; 847 int ret; 848 849 command = UCSI_GET_CONNECTOR_STATUS | UCSI_CONNECTOR_NUMBER(con->num); 850 ret = ucsi_send_command(con->ucsi, command, &con->status, sizeof(con->status)); 851 if (ret < 0) { 852 dev_err(con->ucsi->dev, "GET_CONNECTOR_STATUS failed (%d)\n", ret); 853 return ret; 854 } 855 856 if (con->status.flags == prev_flags) 857 return 0; 858 859 if (con->status.flags & UCSI_CONSTAT_CONNECTED) { 860 ucsi_register_partner(con); 861 ucsi_pwr_opmode_change(con); 862 ucsi_partner_change(con); 863 } else { 864 ucsi_partner_change(con); 865 ucsi_port_psy_changed(con); 866 ucsi_unregister_partner(con); 867 } 868 869 return 0; 870 } 871 872 static void ucsi_handle_connector_change(struct work_struct *work) 873 { 874 struct ucsi_connector *con = container_of(work, struct ucsi_connector, 875 work); 876 struct ucsi *ucsi = con->ucsi; 877 enum typec_role role; 878 u64 command; 879 int ret; 880 881 mutex_lock(&con->lock); 882 883 command = UCSI_GET_CONNECTOR_STATUS | UCSI_CONNECTOR_NUMBER(con->num); 884 ret = ucsi_send_command(ucsi, command, &con->status, sizeof(con->status)); 885 if (ret < 0) { 886 dev_err(ucsi->dev, "%s: GET_CONNECTOR_STATUS failed (%d)\n", 887 __func__, ret); 888 clear_bit(EVENT_PENDING, &con->ucsi->flags); 889 goto out_unlock; 890 } 891 892 trace_ucsi_connector_change(con->num, &con->status); 893 894 role = !!(con->status.flags & UCSI_CONSTAT_PWR_DIR); 895 896 if (con->status.change & UCSI_CONSTAT_POWER_DIR_CHANGE) { 897 typec_set_pwr_role(con->port, role); 898 899 /* Complete pending power role swap */ 900 if (!completion_done(&con->complete)) 901 complete(&con->complete); 902 } 903 904 if (con->status.change & UCSI_CONSTAT_CONNECT_CHANGE) { 905 typec_set_pwr_role(con->port, role); 906 ucsi_port_psy_changed(con); 907 ucsi_partner_change(con); 908 909 if (con->status.flags & UCSI_CONSTAT_CONNECTED) { 910 ucsi_register_partner(con); 911 ucsi_partner_task(con, ucsi_check_connection, 1, HZ); 912 913 if (UCSI_CONSTAT_PWR_OPMODE(con->status.flags) == 914 UCSI_CONSTAT_PWR_OPMODE_PD) 915 ucsi_partner_task(con, ucsi_register_partner_pdos, 1, HZ); 916 } else { 917 ucsi_unregister_partner(con); 918 } 919 } 920 921 if (con->status.change & UCSI_CONSTAT_POWER_OPMODE_CHANGE || 922 con->status.change & UCSI_CONSTAT_POWER_LEVEL_CHANGE) 923 ucsi_pwr_opmode_change(con); 924 925 if (con->partner && con->status.change & UCSI_CONSTAT_PARTNER_CHANGE) { 926 ucsi_partner_change(con); 927 928 /* Complete pending data role swap */ 929 if (!completion_done(&con->complete)) 930 complete(&con->complete); 931 } 932 933 if (con->status.change & UCSI_CONSTAT_CAM_CHANGE) 934 ucsi_partner_task(con, ucsi_check_altmodes, 1, 0); 935 936 clear_bit(EVENT_PENDING, &con->ucsi->flags); 937 938 ret = ucsi_acknowledge_connector_change(ucsi); 939 if (ret) 940 dev_err(ucsi->dev, "%s: ACK failed (%d)", __func__, ret); 941 942 out_unlock: 943 mutex_unlock(&con->lock); 944 } 945 946 /** 947 * ucsi_connector_change - Process Connector Change Event 948 * @ucsi: UCSI Interface 949 * @num: Connector number 950 */ 951 void ucsi_connector_change(struct ucsi *ucsi, u8 num) 952 { 953 struct ucsi_connector *con = &ucsi->connector[num - 1]; 954 955 if (!(ucsi->ntfy & UCSI_ENABLE_NTFY_CONNECTOR_CHANGE)) { 956 dev_dbg(ucsi->dev, "Bogus connector change event\n"); 957 return; 958 } 959 960 if (!test_and_set_bit(EVENT_PENDING, &ucsi->flags)) 961 schedule_work(&con->work); 962 } 963 EXPORT_SYMBOL_GPL(ucsi_connector_change); 964 965 /* -------------------------------------------------------------------------- */ 966 967 static int ucsi_reset_connector(struct ucsi_connector *con, bool hard) 968 { 969 u64 command; 970 971 command = UCSI_CONNECTOR_RESET | UCSI_CONNECTOR_NUMBER(con->num); 972 command |= hard ? UCSI_CONNECTOR_RESET_HARD : 0; 973 974 return ucsi_send_command(con->ucsi, command, NULL, 0); 975 } 976 977 static int ucsi_reset_ppm(struct ucsi *ucsi) 978 { 979 u64 command = UCSI_PPM_RESET; 980 unsigned long tmo; 981 u32 cci; 982 int ret; 983 984 mutex_lock(&ucsi->ppm_lock); 985 986 ret = ucsi->ops->async_write(ucsi, UCSI_CONTROL, &command, 987 sizeof(command)); 988 if (ret < 0) 989 goto out; 990 991 tmo = jiffies + msecs_to_jiffies(UCSI_TIMEOUT_MS); 992 993 do { 994 if (time_is_before_jiffies(tmo)) { 995 ret = -ETIMEDOUT; 996 goto out; 997 } 998 999 ret = ucsi->ops->read(ucsi, UCSI_CCI, &cci, sizeof(cci)); 1000 if (ret) 1001 goto out; 1002 1003 /* If the PPM is still doing something else, reset it again. */ 1004 if (cci & ~UCSI_CCI_RESET_COMPLETE) { 1005 ret = ucsi->ops->async_write(ucsi, UCSI_CONTROL, 1006 &command, 1007 sizeof(command)); 1008 if (ret < 0) 1009 goto out; 1010 } 1011 1012 msleep(20); 1013 } while (!(cci & UCSI_CCI_RESET_COMPLETE)); 1014 1015 out: 1016 mutex_unlock(&ucsi->ppm_lock); 1017 return ret; 1018 } 1019 1020 static int ucsi_role_cmd(struct ucsi_connector *con, u64 command) 1021 { 1022 int ret; 1023 1024 ret = ucsi_send_command(con->ucsi, command, NULL, 0); 1025 if (ret == -ETIMEDOUT) { 1026 u64 c; 1027 1028 /* PPM most likely stopped responding. Resetting everything. */ 1029 ucsi_reset_ppm(con->ucsi); 1030 1031 c = UCSI_SET_NOTIFICATION_ENABLE | con->ucsi->ntfy; 1032 ucsi_send_command(con->ucsi, c, NULL, 0); 1033 1034 ucsi_reset_connector(con, true); 1035 } 1036 1037 return ret; 1038 } 1039 1040 static int ucsi_dr_swap(struct typec_port *port, enum typec_data_role role) 1041 { 1042 struct ucsi_connector *con = typec_get_drvdata(port); 1043 u8 partner_type; 1044 u64 command; 1045 int ret = 0; 1046 1047 mutex_lock(&con->lock); 1048 1049 if (!con->partner) { 1050 ret = -ENOTCONN; 1051 goto out_unlock; 1052 } 1053 1054 partner_type = UCSI_CONSTAT_PARTNER_TYPE(con->status.flags); 1055 if ((partner_type == UCSI_CONSTAT_PARTNER_TYPE_DFP && 1056 role == TYPEC_DEVICE) || 1057 (partner_type == UCSI_CONSTAT_PARTNER_TYPE_UFP && 1058 role == TYPEC_HOST)) 1059 goto out_unlock; 1060 1061 reinit_completion(&con->complete); 1062 1063 command = UCSI_SET_UOR | UCSI_CONNECTOR_NUMBER(con->num); 1064 command |= UCSI_SET_UOR_ROLE(role); 1065 command |= UCSI_SET_UOR_ACCEPT_ROLE_SWAPS; 1066 ret = ucsi_role_cmd(con, command); 1067 if (ret < 0) 1068 goto out_unlock; 1069 1070 mutex_unlock(&con->lock); 1071 1072 if (!wait_for_completion_timeout(&con->complete, 1073 msecs_to_jiffies(UCSI_SWAP_TIMEOUT_MS))) 1074 return -ETIMEDOUT; 1075 1076 return 0; 1077 1078 out_unlock: 1079 mutex_unlock(&con->lock); 1080 1081 return ret; 1082 } 1083 1084 static int ucsi_pr_swap(struct typec_port *port, enum typec_role role) 1085 { 1086 struct ucsi_connector *con = typec_get_drvdata(port); 1087 enum typec_role cur_role; 1088 u64 command; 1089 int ret = 0; 1090 1091 mutex_lock(&con->lock); 1092 1093 if (!con->partner) { 1094 ret = -ENOTCONN; 1095 goto out_unlock; 1096 } 1097 1098 cur_role = !!(con->status.flags & UCSI_CONSTAT_PWR_DIR); 1099 1100 if (cur_role == role) 1101 goto out_unlock; 1102 1103 reinit_completion(&con->complete); 1104 1105 command = UCSI_SET_PDR | UCSI_CONNECTOR_NUMBER(con->num); 1106 command |= UCSI_SET_PDR_ROLE(role); 1107 command |= UCSI_SET_PDR_ACCEPT_ROLE_SWAPS; 1108 ret = ucsi_role_cmd(con, command); 1109 if (ret < 0) 1110 goto out_unlock; 1111 1112 mutex_unlock(&con->lock); 1113 1114 if (!wait_for_completion_timeout(&con->complete, 1115 msecs_to_jiffies(UCSI_SWAP_TIMEOUT_MS))) 1116 return -ETIMEDOUT; 1117 1118 mutex_lock(&con->lock); 1119 1120 /* Something has gone wrong while swapping the role */ 1121 if (UCSI_CONSTAT_PWR_OPMODE(con->status.flags) != 1122 UCSI_CONSTAT_PWR_OPMODE_PD) { 1123 ucsi_reset_connector(con, true); 1124 ret = -EPROTO; 1125 } 1126 1127 out_unlock: 1128 mutex_unlock(&con->lock); 1129 1130 return ret; 1131 } 1132 1133 static const struct typec_operations ucsi_ops = { 1134 .dr_set = ucsi_dr_swap, 1135 .pr_set = ucsi_pr_swap 1136 }; 1137 1138 /* Caller must call fwnode_handle_put() after use */ 1139 static struct fwnode_handle *ucsi_find_fwnode(struct ucsi_connector *con) 1140 { 1141 struct fwnode_handle *fwnode; 1142 int i = 1; 1143 1144 device_for_each_child_node(con->ucsi->dev, fwnode) 1145 if (i++ == con->num) 1146 return fwnode; 1147 return NULL; 1148 } 1149 1150 static int ucsi_register_port(struct ucsi *ucsi, struct ucsi_connector *con) 1151 { 1152 struct usb_power_delivery_desc desc = { ucsi->cap.pd_version}; 1153 struct usb_power_delivery_capabilities_desc pd_caps; 1154 struct usb_power_delivery_capabilities *pd_cap; 1155 struct typec_capability *cap = &con->typec_cap; 1156 enum typec_accessory *accessory = cap->accessory; 1157 enum usb_role u_role = USB_ROLE_NONE; 1158 u64 command; 1159 char *name; 1160 int ret; 1161 1162 name = kasprintf(GFP_KERNEL, "%s-con%d", dev_name(ucsi->dev), con->num); 1163 if (!name) 1164 return -ENOMEM; 1165 1166 con->wq = create_singlethread_workqueue(name); 1167 kfree(name); 1168 if (!con->wq) 1169 return -ENOMEM; 1170 1171 INIT_WORK(&con->work, ucsi_handle_connector_change); 1172 init_completion(&con->complete); 1173 mutex_init(&con->lock); 1174 INIT_LIST_HEAD(&con->partner_tasks); 1175 con->ucsi = ucsi; 1176 1177 cap->fwnode = ucsi_find_fwnode(con); 1178 con->usb_role_sw = fwnode_usb_role_switch_get(cap->fwnode); 1179 if (IS_ERR(con->usb_role_sw)) 1180 return dev_err_probe(ucsi->dev, PTR_ERR(con->usb_role_sw), 1181 "con%d: failed to get usb role switch\n", con->num); 1182 1183 /* Delay other interactions with the con until registration is complete */ 1184 mutex_lock(&con->lock); 1185 1186 /* Get connector capability */ 1187 command = UCSI_GET_CONNECTOR_CAPABILITY; 1188 command |= UCSI_CONNECTOR_NUMBER(con->num); 1189 ret = ucsi_send_command(ucsi, command, &con->cap, sizeof(con->cap)); 1190 if (ret < 0) 1191 goto out_unlock; 1192 1193 if (con->cap.op_mode & UCSI_CONCAP_OPMODE_DRP) 1194 cap->data = TYPEC_PORT_DRD; 1195 else if (con->cap.op_mode & UCSI_CONCAP_OPMODE_DFP) 1196 cap->data = TYPEC_PORT_DFP; 1197 else if (con->cap.op_mode & UCSI_CONCAP_OPMODE_UFP) 1198 cap->data = TYPEC_PORT_UFP; 1199 1200 if ((con->cap.flags & UCSI_CONCAP_FLAG_PROVIDER) && 1201 (con->cap.flags & UCSI_CONCAP_FLAG_CONSUMER)) 1202 cap->type = TYPEC_PORT_DRP; 1203 else if (con->cap.flags & UCSI_CONCAP_FLAG_PROVIDER) 1204 cap->type = TYPEC_PORT_SRC; 1205 else if (con->cap.flags & UCSI_CONCAP_FLAG_CONSUMER) 1206 cap->type = TYPEC_PORT_SNK; 1207 1208 cap->revision = ucsi->cap.typec_version; 1209 cap->pd_revision = ucsi->cap.pd_version; 1210 cap->svdm_version = SVDM_VER_2_0; 1211 cap->prefer_role = TYPEC_NO_PREFERRED_ROLE; 1212 1213 if (con->cap.op_mode & UCSI_CONCAP_OPMODE_AUDIO_ACCESSORY) 1214 *accessory++ = TYPEC_ACCESSORY_AUDIO; 1215 if (con->cap.op_mode & UCSI_CONCAP_OPMODE_DEBUG_ACCESSORY) 1216 *accessory = TYPEC_ACCESSORY_DEBUG; 1217 1218 cap->driver_data = con; 1219 cap->ops = &ucsi_ops; 1220 1221 ret = ucsi_register_port_psy(con); 1222 if (ret) 1223 goto out; 1224 1225 /* Register the connector */ 1226 con->port = typec_register_port(ucsi->dev, cap); 1227 if (IS_ERR(con->port)) { 1228 ret = PTR_ERR(con->port); 1229 goto out; 1230 } 1231 1232 con->pd = usb_power_delivery_register(ucsi->dev, &desc); 1233 1234 ret = ucsi_get_pdos(con, TYPEC_SOURCE, 0, pd_caps.pdo); 1235 if (ret > 0) { 1236 if (ret < PDO_MAX_OBJECTS) 1237 pd_caps.pdo[ret] = 0; 1238 1239 pd_caps.role = TYPEC_SOURCE; 1240 pd_cap = usb_power_delivery_register_capabilities(con->pd, &pd_caps); 1241 if (IS_ERR(pd_cap)) { 1242 ret = PTR_ERR(pd_cap); 1243 goto out; 1244 } 1245 1246 con->port_source_caps = pd_cap; 1247 typec_port_set_usb_power_delivery(con->port, con->pd); 1248 } 1249 1250 memset(&pd_caps, 0, sizeof(pd_caps)); 1251 ret = ucsi_get_pdos(con, TYPEC_SINK, 0, pd_caps.pdo); 1252 if (ret > 0) { 1253 if (ret < PDO_MAX_OBJECTS) 1254 pd_caps.pdo[ret] = 0; 1255 1256 pd_caps.role = TYPEC_SINK; 1257 pd_cap = usb_power_delivery_register_capabilities(con->pd, &pd_caps); 1258 if (IS_ERR(pd_cap)) { 1259 ret = PTR_ERR(pd_cap); 1260 goto out; 1261 } 1262 1263 con->port_sink_caps = pd_cap; 1264 typec_port_set_usb_power_delivery(con->port, con->pd); 1265 } 1266 1267 /* Alternate modes */ 1268 ret = ucsi_register_altmodes(con, UCSI_RECIPIENT_CON); 1269 if (ret) { 1270 dev_err(ucsi->dev, "con%d: failed to register alt modes\n", 1271 con->num); 1272 goto out; 1273 } 1274 1275 /* Get the status */ 1276 command = UCSI_GET_CONNECTOR_STATUS | UCSI_CONNECTOR_NUMBER(con->num); 1277 ret = ucsi_send_command(ucsi, command, &con->status, sizeof(con->status)); 1278 if (ret < 0) { 1279 dev_err(ucsi->dev, "con%d: failed to get status\n", con->num); 1280 ret = 0; 1281 goto out; 1282 } 1283 ret = 0; /* ucsi_send_command() returns length on success */ 1284 1285 switch (UCSI_CONSTAT_PARTNER_TYPE(con->status.flags)) { 1286 case UCSI_CONSTAT_PARTNER_TYPE_UFP: 1287 case UCSI_CONSTAT_PARTNER_TYPE_CABLE_AND_UFP: 1288 u_role = USB_ROLE_HOST; 1289 fallthrough; 1290 case UCSI_CONSTAT_PARTNER_TYPE_CABLE: 1291 typec_set_data_role(con->port, TYPEC_HOST); 1292 break; 1293 case UCSI_CONSTAT_PARTNER_TYPE_DFP: 1294 u_role = USB_ROLE_DEVICE; 1295 typec_set_data_role(con->port, TYPEC_DEVICE); 1296 break; 1297 default: 1298 break; 1299 } 1300 1301 /* Check if there is already something connected */ 1302 if (con->status.flags & UCSI_CONSTAT_CONNECTED) { 1303 typec_set_pwr_role(con->port, 1304 !!(con->status.flags & UCSI_CONSTAT_PWR_DIR)); 1305 ucsi_register_partner(con); 1306 ucsi_pwr_opmode_change(con); 1307 ucsi_port_psy_changed(con); 1308 } 1309 1310 /* Only notify USB controller if partner supports USB data */ 1311 if (!(UCSI_CONSTAT_PARTNER_FLAGS(con->status.flags) & UCSI_CONSTAT_PARTNER_FLAG_USB)) 1312 u_role = USB_ROLE_NONE; 1313 1314 ret = usb_role_switch_set_role(con->usb_role_sw, u_role); 1315 if (ret) { 1316 dev_err(ucsi->dev, "con:%d: failed to set usb role:%d\n", 1317 con->num, u_role); 1318 ret = 0; 1319 } 1320 1321 if (con->partner && 1322 UCSI_CONSTAT_PWR_OPMODE(con->status.flags) == 1323 UCSI_CONSTAT_PWR_OPMODE_PD) { 1324 ucsi_get_src_pdos(con); 1325 ucsi_check_altmodes(con); 1326 } 1327 1328 trace_ucsi_register_port(con->num, &con->status); 1329 1330 out: 1331 fwnode_handle_put(cap->fwnode); 1332 out_unlock: 1333 mutex_unlock(&con->lock); 1334 1335 if (ret && con->wq) { 1336 destroy_workqueue(con->wq); 1337 con->wq = NULL; 1338 } 1339 1340 return ret; 1341 } 1342 1343 /** 1344 * ucsi_init - Initialize UCSI interface 1345 * @ucsi: UCSI to be initialized 1346 * 1347 * Registers all ports @ucsi has and enables all notification events. 1348 */ 1349 static int ucsi_init(struct ucsi *ucsi) 1350 { 1351 struct ucsi_connector *con, *connector; 1352 u64 command, ntfy; 1353 int ret; 1354 int i; 1355 1356 /* Reset the PPM */ 1357 ret = ucsi_reset_ppm(ucsi); 1358 if (ret) { 1359 dev_err(ucsi->dev, "failed to reset PPM!\n"); 1360 goto err; 1361 } 1362 1363 /* Enable basic notifications */ 1364 ntfy = UCSI_ENABLE_NTFY_CMD_COMPLETE | UCSI_ENABLE_NTFY_ERROR; 1365 command = UCSI_SET_NOTIFICATION_ENABLE | ntfy; 1366 ret = ucsi_send_command(ucsi, command, NULL, 0); 1367 if (ret < 0) 1368 goto err_reset; 1369 1370 /* Get PPM capabilities */ 1371 command = UCSI_GET_CAPABILITY; 1372 ret = ucsi_send_command(ucsi, command, &ucsi->cap, sizeof(ucsi->cap)); 1373 if (ret < 0) 1374 goto err_reset; 1375 1376 if (!ucsi->cap.num_connectors) { 1377 ret = -ENODEV; 1378 goto err_reset; 1379 } 1380 1381 /* Allocate the connectors. Released in ucsi_unregister() */ 1382 connector = kcalloc(ucsi->cap.num_connectors + 1, sizeof(*connector), GFP_KERNEL); 1383 if (!connector) { 1384 ret = -ENOMEM; 1385 goto err_reset; 1386 } 1387 1388 /* Register all connectors */ 1389 for (i = 0; i < ucsi->cap.num_connectors; i++) { 1390 connector[i].num = i + 1; 1391 ret = ucsi_register_port(ucsi, &connector[i]); 1392 if (ret) 1393 goto err_unregister; 1394 } 1395 1396 /* Enable all notifications */ 1397 ntfy = UCSI_ENABLE_NTFY_ALL; 1398 command = UCSI_SET_NOTIFICATION_ENABLE | ntfy; 1399 ret = ucsi_send_command(ucsi, command, NULL, 0); 1400 if (ret < 0) 1401 goto err_unregister; 1402 1403 ucsi->connector = connector; 1404 ucsi->ntfy = ntfy; 1405 return 0; 1406 1407 err_unregister: 1408 for (con = connector; con->port; con++) { 1409 ucsi_unregister_partner(con); 1410 ucsi_unregister_altmodes(con, UCSI_RECIPIENT_CON); 1411 ucsi_unregister_port_psy(con); 1412 if (con->wq) 1413 destroy_workqueue(con->wq); 1414 1415 usb_power_delivery_unregister_capabilities(con->port_sink_caps); 1416 con->port_sink_caps = NULL; 1417 usb_power_delivery_unregister_capabilities(con->port_source_caps); 1418 con->port_source_caps = NULL; 1419 usb_power_delivery_unregister(con->pd); 1420 con->pd = NULL; 1421 typec_unregister_port(con->port); 1422 con->port = NULL; 1423 } 1424 kfree(connector); 1425 err_reset: 1426 memset(&ucsi->cap, 0, sizeof(ucsi->cap)); 1427 ucsi_reset_ppm(ucsi); 1428 err: 1429 return ret; 1430 } 1431 1432 static void ucsi_resume_work(struct work_struct *work) 1433 { 1434 struct ucsi *ucsi = container_of(work, struct ucsi, resume_work); 1435 struct ucsi_connector *con; 1436 u64 command; 1437 int ret; 1438 1439 /* Restore UCSI notification enable mask after system resume */ 1440 command = UCSI_SET_NOTIFICATION_ENABLE | ucsi->ntfy; 1441 ret = ucsi_send_command(ucsi, command, NULL, 0); 1442 if (ret < 0) { 1443 dev_err(ucsi->dev, "failed to re-enable notifications (%d)\n", ret); 1444 return; 1445 } 1446 1447 for (con = ucsi->connector; con->port; con++) { 1448 mutex_lock(&con->lock); 1449 ucsi_partner_task(con, ucsi_check_connection, 1, 0); 1450 mutex_unlock(&con->lock); 1451 } 1452 } 1453 1454 int ucsi_resume(struct ucsi *ucsi) 1455 { 1456 if (ucsi->connector) 1457 queue_work(system_long_wq, &ucsi->resume_work); 1458 return 0; 1459 } 1460 EXPORT_SYMBOL_GPL(ucsi_resume); 1461 1462 static void ucsi_init_work(struct work_struct *work) 1463 { 1464 struct ucsi *ucsi = container_of(work, struct ucsi, work.work); 1465 int ret; 1466 1467 ret = ucsi_init(ucsi); 1468 if (ret) 1469 dev_err_probe(ucsi->dev, ret, "PPM init failed\n"); 1470 1471 if (ret == -EPROBE_DEFER) { 1472 if (ucsi->work_count++ > UCSI_ROLE_SWITCH_WAIT_COUNT) { 1473 dev_err(ucsi->dev, "PPM init failed, stop trying\n"); 1474 return; 1475 } 1476 1477 queue_delayed_work(system_long_wq, &ucsi->work, 1478 UCSI_ROLE_SWITCH_INTERVAL); 1479 } 1480 } 1481 1482 /** 1483 * ucsi_get_drvdata - Return private driver data pointer 1484 * @ucsi: UCSI interface 1485 */ 1486 void *ucsi_get_drvdata(struct ucsi *ucsi) 1487 { 1488 return ucsi->driver_data; 1489 } 1490 EXPORT_SYMBOL_GPL(ucsi_get_drvdata); 1491 1492 /** 1493 * ucsi_set_drvdata - Assign private driver data pointer 1494 * @ucsi: UCSI interface 1495 * @data: Private data pointer 1496 */ 1497 void ucsi_set_drvdata(struct ucsi *ucsi, void *data) 1498 { 1499 ucsi->driver_data = data; 1500 } 1501 EXPORT_SYMBOL_GPL(ucsi_set_drvdata); 1502 1503 /** 1504 * ucsi_create - Allocate UCSI instance 1505 * @dev: Device interface to the PPM (Platform Policy Manager) 1506 * @ops: I/O routines 1507 */ 1508 struct ucsi *ucsi_create(struct device *dev, const struct ucsi_operations *ops) 1509 { 1510 struct ucsi *ucsi; 1511 1512 if (!ops || !ops->read || !ops->sync_write || !ops->async_write) 1513 return ERR_PTR(-EINVAL); 1514 1515 ucsi = kzalloc(sizeof(*ucsi), GFP_KERNEL); 1516 if (!ucsi) 1517 return ERR_PTR(-ENOMEM); 1518 1519 INIT_WORK(&ucsi->resume_work, ucsi_resume_work); 1520 INIT_DELAYED_WORK(&ucsi->work, ucsi_init_work); 1521 mutex_init(&ucsi->ppm_lock); 1522 ucsi->dev = dev; 1523 ucsi->ops = ops; 1524 1525 return ucsi; 1526 } 1527 EXPORT_SYMBOL_GPL(ucsi_create); 1528 1529 /** 1530 * ucsi_destroy - Free UCSI instance 1531 * @ucsi: UCSI instance to be freed 1532 */ 1533 void ucsi_destroy(struct ucsi *ucsi) 1534 { 1535 ucsi_debugfs_unregister(ucsi); 1536 kfree(ucsi); 1537 } 1538 EXPORT_SYMBOL_GPL(ucsi_destroy); 1539 1540 /** 1541 * ucsi_register - Register UCSI interface 1542 * @ucsi: UCSI instance 1543 */ 1544 int ucsi_register(struct ucsi *ucsi) 1545 { 1546 int ret; 1547 1548 ret = ucsi->ops->read(ucsi, UCSI_VERSION, &ucsi->version, 1549 sizeof(ucsi->version)); 1550 if (ret) 1551 return ret; 1552 1553 if (!ucsi->version) 1554 return -ENODEV; 1555 1556 queue_delayed_work(system_long_wq, &ucsi->work, 0); 1557 1558 ucsi_debugfs_register(ucsi); 1559 return 0; 1560 } 1561 EXPORT_SYMBOL_GPL(ucsi_register); 1562 1563 /** 1564 * ucsi_unregister - Unregister UCSI interface 1565 * @ucsi: UCSI interface to be unregistered 1566 * 1567 * Unregister UCSI interface that was created with ucsi_register(). 1568 */ 1569 void ucsi_unregister(struct ucsi *ucsi) 1570 { 1571 u64 cmd = UCSI_SET_NOTIFICATION_ENABLE; 1572 int i; 1573 1574 /* Make sure that we are not in the middle of driver initialization */ 1575 cancel_delayed_work_sync(&ucsi->work); 1576 cancel_work_sync(&ucsi->resume_work); 1577 1578 /* Disable notifications */ 1579 ucsi->ops->async_write(ucsi, UCSI_CONTROL, &cmd, sizeof(cmd)); 1580 1581 if (!ucsi->connector) 1582 return; 1583 1584 for (i = 0; i < ucsi->cap.num_connectors; i++) { 1585 cancel_work_sync(&ucsi->connector[i].work); 1586 ucsi_unregister_partner(&ucsi->connector[i]); 1587 ucsi_unregister_altmodes(&ucsi->connector[i], 1588 UCSI_RECIPIENT_CON); 1589 ucsi_unregister_port_psy(&ucsi->connector[i]); 1590 1591 if (ucsi->connector[i].wq) { 1592 struct ucsi_work *uwork; 1593 1594 mutex_lock(&ucsi->connector[i].lock); 1595 /* 1596 * queue delayed items immediately so they can execute 1597 * and free themselves before the wq is destroyed 1598 */ 1599 list_for_each_entry(uwork, &ucsi->connector[i].partner_tasks, node) 1600 mod_delayed_work(ucsi->connector[i].wq, &uwork->work, 0); 1601 mutex_unlock(&ucsi->connector[i].lock); 1602 destroy_workqueue(ucsi->connector[i].wq); 1603 } 1604 1605 usb_power_delivery_unregister_capabilities(ucsi->connector[i].port_sink_caps); 1606 ucsi->connector[i].port_sink_caps = NULL; 1607 usb_power_delivery_unregister_capabilities(ucsi->connector[i].port_source_caps); 1608 ucsi->connector[i].port_source_caps = NULL; 1609 usb_power_delivery_unregister(ucsi->connector[i].pd); 1610 ucsi->connector[i].pd = NULL; 1611 typec_unregister_port(ucsi->connector[i].port); 1612 } 1613 1614 kfree(ucsi->connector); 1615 } 1616 EXPORT_SYMBOL_GPL(ucsi_unregister); 1617 1618 static int __init ucsi_module_init(void) 1619 { 1620 ucsi_debugfs_init(); 1621 return 0; 1622 } 1623 module_init(ucsi_module_init); 1624 1625 static void __exit ucsi_module_exit(void) 1626 { 1627 ucsi_debugfs_exit(); 1628 } 1629 module_exit(ucsi_module_exit); 1630 1631 MODULE_AUTHOR("Heikki Krogerus <heikki.krogerus@linux.intel.com>"); 1632 MODULE_LICENSE("GPL v2"); 1633 MODULE_DESCRIPTION("USB Type-C Connector System Software Interface driver"); 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