1// SPDX-License-Identifier: GPL-2.0 2/* 3 * SVC Greybus driver. 4 * 5 * Copyright 2015 Google Inc. 6 * Copyright 2015 Linaro Ltd. 7 */ 8 9#include <linux/debugfs.h> 10#include <linux/workqueue.h> 11#include <linux/greybus.h> 12 13#define SVC_INTF_EJECT_TIMEOUT 9000 14#define SVC_INTF_ACTIVATE_TIMEOUT 6000 15#define SVC_INTF_RESUME_TIMEOUT 3000 16 17struct gb_svc_deferred_request { 18 struct work_struct work; 19 struct gb_operation *operation; 20}; 21 22static int gb_svc_queue_deferred_request(struct gb_operation *operation); 23 24static ssize_t endo_id_show(struct device *dev, 25 struct device_attribute *attr, char *buf) 26{ 27 struct gb_svc *svc = to_gb_svc(dev); 28 29 return sprintf(buf, "0x%04x\n", svc->endo_id); 30} 31static DEVICE_ATTR_RO(endo_id); 32 33static ssize_t ap_intf_id_show(struct device *dev, 34 struct device_attribute *attr, char *buf) 35{ 36 struct gb_svc *svc = to_gb_svc(dev); 37 38 return sprintf(buf, "%u\n", svc->ap_intf_id); 39} 40static DEVICE_ATTR_RO(ap_intf_id); 41 42// FIXME 43// This is a hack, we need to do this "right" and clean the interface up 44// properly, not just forcibly yank the thing out of the system and hope for the 45// best. But for now, people want their modules to come out without having to 46// throw the thing to the ground or get out a screwdriver. 47static ssize_t intf_eject_store(struct device *dev, 48 struct device_attribute *attr, const char *buf, 49 size_t len) 50{ 51 struct gb_svc *svc = to_gb_svc(dev); 52 unsigned short intf_id; 53 int ret; 54 55 ret = kstrtou16(buf, 10, &intf_id); 56 if (ret < 0) 57 return ret; 58 59 dev_warn(dev, "Forcibly trying to eject interface %d\n", intf_id); 60 61 ret = gb_svc_intf_eject(svc, intf_id); 62 if (ret < 0) 63 return ret; 64 65 return len; 66} 67static DEVICE_ATTR_WO(intf_eject); 68 69static ssize_t watchdog_show(struct device *dev, struct device_attribute *attr, 70 char *buf) 71{ 72 struct gb_svc *svc = to_gb_svc(dev); 73 74 return sprintf(buf, "%s\n", 75 gb_svc_watchdog_enabled(svc) ? "enabled" : "disabled"); 76} 77 78static ssize_t watchdog_store(struct device *dev, 79 struct device_attribute *attr, const char *buf, 80 size_t len) 81{ 82 struct gb_svc *svc = to_gb_svc(dev); 83 int retval; 84 bool user_request; 85 86 retval = strtobool(buf, &user_request); 87 if (retval) 88 return retval; 89 90 if (user_request) 91 retval = gb_svc_watchdog_enable(svc); 92 else 93 retval = gb_svc_watchdog_disable(svc); 94 if (retval) 95 return retval; 96 return len; 97} 98static DEVICE_ATTR_RW(watchdog); 99 100static ssize_t watchdog_action_show(struct device *dev, 101 struct device_attribute *attr, char *buf) 102{ 103 struct gb_svc *svc = to_gb_svc(dev); 104 105 if (svc->action == GB_SVC_WATCHDOG_BITE_PANIC_KERNEL) 106 return sprintf(buf, "panic\n"); 107 else if (svc->action == GB_SVC_WATCHDOG_BITE_RESET_UNIPRO) 108 return sprintf(buf, "reset\n"); 109 110 return -EINVAL; 111} 112 113static ssize_t watchdog_action_store(struct device *dev, 114 struct device_attribute *attr, 115 const char *buf, size_t len) 116{ 117 struct gb_svc *svc = to_gb_svc(dev); 118 119 if (sysfs_streq(buf, "panic")) 120 svc->action = GB_SVC_WATCHDOG_BITE_PANIC_KERNEL; 121 else if (sysfs_streq(buf, "reset")) 122 svc->action = GB_SVC_WATCHDOG_BITE_RESET_UNIPRO; 123 else 124 return -EINVAL; 125 126 return len; 127} 128static DEVICE_ATTR_RW(watchdog_action); 129 130static int gb_svc_pwrmon_rail_count_get(struct gb_svc *svc, u8 *value) 131{ 132 struct gb_svc_pwrmon_rail_count_get_response response; 133 int ret; 134 135 ret = gb_operation_sync(svc->connection, 136 GB_SVC_TYPE_PWRMON_RAIL_COUNT_GET, NULL, 0, 137 &response, sizeof(response)); 138 if (ret) { 139 dev_err(&svc->dev, "failed to get rail count: %d\n", ret); 140 return ret; 141 } 142 143 *value = response.rail_count; 144 145 return 0; 146} 147 148static int gb_svc_pwrmon_rail_names_get(struct gb_svc *svc, 149 struct gb_svc_pwrmon_rail_names_get_response *response, 150 size_t bufsize) 151{ 152 int ret; 153 154 ret = gb_operation_sync(svc->connection, 155 GB_SVC_TYPE_PWRMON_RAIL_NAMES_GET, NULL, 0, 156 response, bufsize); 157 if (ret) { 158 dev_err(&svc->dev, "failed to get rail names: %d\n", ret); 159 return ret; 160 } 161 162 if (response->status != GB_SVC_OP_SUCCESS) { 163 dev_err(&svc->dev, 164 "SVC error while getting rail names: %u\n", 165 response->status); 166 return -EREMOTEIO; 167 } 168 169 return 0; 170} 171 172static int gb_svc_pwrmon_sample_get(struct gb_svc *svc, u8 rail_id, 173 u8 measurement_type, u32 *value) 174{ 175 struct gb_svc_pwrmon_sample_get_request request; 176 struct gb_svc_pwrmon_sample_get_response response; 177 int ret; 178 179 request.rail_id = rail_id; 180 request.measurement_type = measurement_type; 181 182 ret = gb_operation_sync(svc->connection, GB_SVC_TYPE_PWRMON_SAMPLE_GET, 183 &request, sizeof(request), 184 &response, sizeof(response)); 185 if (ret) { 186 dev_err(&svc->dev, "failed to get rail sample: %d\n", ret); 187 return ret; 188 } 189 190 if (response.result) { 191 dev_err(&svc->dev, 192 "UniPro error while getting rail power sample (%d %d): %d\n", 193 rail_id, measurement_type, response.result); 194 switch (response.result) { 195 case GB_SVC_PWRMON_GET_SAMPLE_INVAL: 196 return -EINVAL; 197 case GB_SVC_PWRMON_GET_SAMPLE_NOSUPP: 198 return -ENOMSG; 199 default: 200 return -EREMOTEIO; 201 } 202 } 203 204 *value = le32_to_cpu(response.measurement); 205 206 return 0; 207} 208 209int gb_svc_pwrmon_intf_sample_get(struct gb_svc *svc, u8 intf_id, 210 u8 measurement_type, u32 *value) 211{ 212 struct gb_svc_pwrmon_intf_sample_get_request request; 213 struct gb_svc_pwrmon_intf_sample_get_response response; 214 int ret; 215 216 request.intf_id = intf_id; 217 request.measurement_type = measurement_type; 218 219 ret = gb_operation_sync(svc->connection, 220 GB_SVC_TYPE_PWRMON_INTF_SAMPLE_GET, 221 &request, sizeof(request), 222 &response, sizeof(response)); 223 if (ret) { 224 dev_err(&svc->dev, "failed to get intf sample: %d\n", ret); 225 return ret; 226 } 227 228 if (response.result) { 229 dev_err(&svc->dev, 230 "UniPro error while getting intf power sample (%d %d): %d\n", 231 intf_id, measurement_type, response.result); 232 switch (response.result) { 233 case GB_SVC_PWRMON_GET_SAMPLE_INVAL: 234 return -EINVAL; 235 case GB_SVC_PWRMON_GET_SAMPLE_NOSUPP: 236 return -ENOMSG; 237 default: 238 return -EREMOTEIO; 239 } 240 } 241 242 *value = le32_to_cpu(response.measurement); 243 244 return 0; 245} 246 247static struct attribute *svc_attrs[] = { 248 &dev_attr_endo_id.attr, 249 &dev_attr_ap_intf_id.attr, 250 &dev_attr_intf_eject.attr, 251 &dev_attr_watchdog.attr, 252 &dev_attr_watchdog_action.attr, 253 NULL, 254}; 255ATTRIBUTE_GROUPS(svc); 256 257int gb_svc_intf_device_id(struct gb_svc *svc, u8 intf_id, u8 device_id) 258{ 259 struct gb_svc_intf_device_id_request request; 260 261 request.intf_id = intf_id; 262 request.device_id = device_id; 263 264 return gb_operation_sync(svc->connection, GB_SVC_TYPE_INTF_DEVICE_ID, 265 &request, sizeof(request), NULL, 0); 266} 267 268int gb_svc_intf_eject(struct gb_svc *svc, u8 intf_id) 269{ 270 struct gb_svc_intf_eject_request request; 271 int ret; 272 273 request.intf_id = intf_id; 274 275 /* 276 * The pulse width for module release in svc is long so we need to 277 * increase the timeout so the operation will not return to soon. 278 */ 279 ret = gb_operation_sync_timeout(svc->connection, 280 GB_SVC_TYPE_INTF_EJECT, &request, 281 sizeof(request), NULL, 0, 282 SVC_INTF_EJECT_TIMEOUT); 283 if (ret) { 284 dev_err(&svc->dev, "failed to eject interface %u\n", intf_id); 285 return ret; 286 } 287 288 return 0; 289} 290 291int gb_svc_intf_vsys_set(struct gb_svc *svc, u8 intf_id, bool enable) 292{ 293 struct gb_svc_intf_vsys_request request; 294 struct gb_svc_intf_vsys_response response; 295 int type, ret; 296 297 request.intf_id = intf_id; 298 299 if (enable) 300 type = GB_SVC_TYPE_INTF_VSYS_ENABLE; 301 else 302 type = GB_SVC_TYPE_INTF_VSYS_DISABLE; 303 304 ret = gb_operation_sync(svc->connection, type, 305 &request, sizeof(request), 306 &response, sizeof(response)); 307 if (ret < 0) 308 return ret; 309 if (response.result_code != GB_SVC_INTF_VSYS_OK) 310 return -EREMOTEIO; 311 return 0; 312} 313 314int gb_svc_intf_refclk_set(struct gb_svc *svc, u8 intf_id, bool enable) 315{ 316 struct gb_svc_intf_refclk_request request; 317 struct gb_svc_intf_refclk_response response; 318 int type, ret; 319 320 request.intf_id = intf_id; 321 322 if (enable) 323 type = GB_SVC_TYPE_INTF_REFCLK_ENABLE; 324 else 325 type = GB_SVC_TYPE_INTF_REFCLK_DISABLE; 326 327 ret = gb_operation_sync(svc->connection, type, 328 &request, sizeof(request), 329 &response, sizeof(response)); 330 if (ret < 0) 331 return ret; 332 if (response.result_code != GB_SVC_INTF_REFCLK_OK) 333 return -EREMOTEIO; 334 return 0; 335} 336 337int gb_svc_intf_unipro_set(struct gb_svc *svc, u8 intf_id, bool enable) 338{ 339 struct gb_svc_intf_unipro_request request; 340 struct gb_svc_intf_unipro_response response; 341 int type, ret; 342 343 request.intf_id = intf_id; 344 345 if (enable) 346 type = GB_SVC_TYPE_INTF_UNIPRO_ENABLE; 347 else 348 type = GB_SVC_TYPE_INTF_UNIPRO_DISABLE; 349 350 ret = gb_operation_sync(svc->connection, type, 351 &request, sizeof(request), 352 &response, sizeof(response)); 353 if (ret < 0) 354 return ret; 355 if (response.result_code != GB_SVC_INTF_UNIPRO_OK) 356 return -EREMOTEIO; 357 return 0; 358} 359 360int gb_svc_intf_activate(struct gb_svc *svc, u8 intf_id, u8 *intf_type) 361{ 362 struct gb_svc_intf_activate_request request; 363 struct gb_svc_intf_activate_response response; 364 int ret; 365 366 request.intf_id = intf_id; 367 368 ret = gb_operation_sync_timeout(svc->connection, 369 GB_SVC_TYPE_INTF_ACTIVATE, 370 &request, sizeof(request), 371 &response, sizeof(response), 372 SVC_INTF_ACTIVATE_TIMEOUT); 373 if (ret < 0) 374 return ret; 375 if (response.status != GB_SVC_OP_SUCCESS) { 376 dev_err(&svc->dev, "failed to activate interface %u: %u\n", 377 intf_id, response.status); 378 return -EREMOTEIO; 379 } 380 381 *intf_type = response.intf_type; 382 383 return 0; 384} 385 386int gb_svc_intf_resume(struct gb_svc *svc, u8 intf_id) 387{ 388 struct gb_svc_intf_resume_request request; 389 struct gb_svc_intf_resume_response response; 390 int ret; 391 392 request.intf_id = intf_id; 393 394 ret = gb_operation_sync_timeout(svc->connection, 395 GB_SVC_TYPE_INTF_RESUME, 396 &request, sizeof(request), 397 &response, sizeof(response), 398 SVC_INTF_RESUME_TIMEOUT); 399 if (ret < 0) { 400 dev_err(&svc->dev, "failed to send interface resume %u: %d\n", 401 intf_id, ret); 402 return ret; 403 } 404 405 if (response.status != GB_SVC_OP_SUCCESS) { 406 dev_err(&svc->dev, "failed to resume interface %u: %u\n", 407 intf_id, response.status); 408 return -EREMOTEIO; 409 } 410 411 return 0; 412} 413 414int gb_svc_dme_peer_get(struct gb_svc *svc, u8 intf_id, u16 attr, u16 selector, 415 u32 *value) 416{ 417 struct gb_svc_dme_peer_get_request request; 418 struct gb_svc_dme_peer_get_response response; 419 u16 result; 420 int ret; 421 422 request.intf_id = intf_id; 423 request.attr = cpu_to_le16(attr); 424 request.selector = cpu_to_le16(selector); 425 426 ret = gb_operation_sync(svc->connection, GB_SVC_TYPE_DME_PEER_GET, 427 &request, sizeof(request), 428 &response, sizeof(response)); 429 if (ret) { 430 dev_err(&svc->dev, "failed to get DME attribute (%u 0x%04x %u): %d\n", 431 intf_id, attr, selector, ret); 432 return ret; 433 } 434 435 result = le16_to_cpu(response.result_code); 436 if (result) { 437 dev_err(&svc->dev, "UniPro error while getting DME attribute (%u 0x%04x %u): %u\n", 438 intf_id, attr, selector, result); 439 return -EREMOTEIO; 440 } 441 442 if (value) 443 *value = le32_to_cpu(response.attr_value); 444 445 return 0; 446} 447 448int gb_svc_dme_peer_set(struct gb_svc *svc, u8 intf_id, u16 attr, u16 selector, 449 u32 value) 450{ 451 struct gb_svc_dme_peer_set_request request; 452 struct gb_svc_dme_peer_set_response response; 453 u16 result; 454 int ret; 455 456 request.intf_id = intf_id; 457 request.attr = cpu_to_le16(attr); 458 request.selector = cpu_to_le16(selector); 459 request.value = cpu_to_le32(value); 460 461 ret = gb_operation_sync(svc->connection, GB_SVC_TYPE_DME_PEER_SET, 462 &request, sizeof(request), 463 &response, sizeof(response)); 464 if (ret) { 465 dev_err(&svc->dev, "failed to set DME attribute (%u 0x%04x %u %u): %d\n", 466 intf_id, attr, selector, value, ret); 467 return ret; 468 } 469 470 result = le16_to_cpu(response.result_code); 471 if (result) { 472 dev_err(&svc->dev, "UniPro error while setting DME attribute (%u 0x%04x %u %u): %u\n", 473 intf_id, attr, selector, value, result); 474 return -EREMOTEIO; 475 } 476 477 return 0; 478} 479 480int gb_svc_connection_create(struct gb_svc *svc, 481 u8 intf1_id, u16 cport1_id, 482 u8 intf2_id, u16 cport2_id, 483 u8 cport_flags) 484{ 485 struct gb_svc_conn_create_request request; 486 487 request.intf1_id = intf1_id; 488 request.cport1_id = cpu_to_le16(cport1_id); 489 request.intf2_id = intf2_id; 490 request.cport2_id = cpu_to_le16(cport2_id); 491 request.tc = 0; /* TC0 */ 492 request.flags = cport_flags; 493 494 return gb_operation_sync(svc->connection, GB_SVC_TYPE_CONN_CREATE, 495 &request, sizeof(request), NULL, 0); 496} 497 498void gb_svc_connection_destroy(struct gb_svc *svc, u8 intf1_id, u16 cport1_id, 499 u8 intf2_id, u16 cport2_id) 500{ 501 struct gb_svc_conn_destroy_request request; 502 struct gb_connection *connection = svc->connection; 503 int ret; 504 505 request.intf1_id = intf1_id; 506 request.cport1_id = cpu_to_le16(cport1_id); 507 request.intf2_id = intf2_id; 508 request.cport2_id = cpu_to_le16(cport2_id); 509 510 ret = gb_operation_sync(connection, GB_SVC_TYPE_CONN_DESTROY, 511 &request, sizeof(request), NULL, 0); 512 if (ret) { 513 dev_err(&svc->dev, "failed to destroy connection (%u:%u %u:%u): %d\n", 514 intf1_id, cport1_id, intf2_id, cport2_id, ret); 515 } 516} 517 518/* Creates bi-directional routes between the devices */ 519int gb_svc_route_create(struct gb_svc *svc, u8 intf1_id, u8 dev1_id, 520 u8 intf2_id, u8 dev2_id) 521{ 522 struct gb_svc_route_create_request request; 523 524 request.intf1_id = intf1_id; 525 request.dev1_id = dev1_id; 526 request.intf2_id = intf2_id; 527 request.dev2_id = dev2_id; 528 529 return gb_operation_sync(svc->connection, GB_SVC_TYPE_ROUTE_CREATE, 530 &request, sizeof(request), NULL, 0); 531} 532 533/* Destroys bi-directional routes between the devices */ 534void gb_svc_route_destroy(struct gb_svc *svc, u8 intf1_id, u8 intf2_id) 535{ 536 struct gb_svc_route_destroy_request request; 537 int ret; 538 539 request.intf1_id = intf1_id; 540 request.intf2_id = intf2_id; 541 542 ret = gb_operation_sync(svc->connection, GB_SVC_TYPE_ROUTE_DESTROY, 543 &request, sizeof(request), NULL, 0); 544 if (ret) { 545 dev_err(&svc->dev, "failed to destroy route (%u %u): %d\n", 546 intf1_id, intf2_id, ret); 547 } 548} 549 550int gb_svc_intf_set_power_mode(struct gb_svc *svc, u8 intf_id, u8 hs_series, 551 u8 tx_mode, u8 tx_gear, u8 tx_nlanes, 552 u8 tx_amplitude, u8 tx_hs_equalizer, 553 u8 rx_mode, u8 rx_gear, u8 rx_nlanes, 554 u8 flags, u32 quirks, 555 struct gb_svc_l2_timer_cfg *local, 556 struct gb_svc_l2_timer_cfg *remote) 557{ 558 struct gb_svc_intf_set_pwrm_request request; 559 struct gb_svc_intf_set_pwrm_response response; 560 int ret; 561 u16 result_code; 562 563 memset(&request, 0, sizeof(request)); 564 565 request.intf_id = intf_id; 566 request.hs_series = hs_series; 567 request.tx_mode = tx_mode; 568 request.tx_gear = tx_gear; 569 request.tx_nlanes = tx_nlanes; 570 request.tx_amplitude = tx_amplitude; 571 request.tx_hs_equalizer = tx_hs_equalizer; 572 request.rx_mode = rx_mode; 573 request.rx_gear = rx_gear; 574 request.rx_nlanes = rx_nlanes; 575 request.flags = flags; 576 request.quirks = cpu_to_le32(quirks); 577 if (local) 578 request.local_l2timerdata = *local; 579 if (remote) 580 request.remote_l2timerdata = *remote; 581 582 ret = gb_operation_sync(svc->connection, GB_SVC_TYPE_INTF_SET_PWRM, 583 &request, sizeof(request), 584 &response, sizeof(response)); 585 if (ret < 0) 586 return ret; 587 588 result_code = response.result_code; 589 if (result_code != GB_SVC_SETPWRM_PWR_LOCAL) { 590 dev_err(&svc->dev, "set power mode = %d\n", result_code); 591 return -EIO; 592 } 593 594 return 0; 595} 596EXPORT_SYMBOL_GPL(gb_svc_intf_set_power_mode); 597 598int gb_svc_intf_set_power_mode_hibernate(struct gb_svc *svc, u8 intf_id) 599{ 600 struct gb_svc_intf_set_pwrm_request request; 601 struct gb_svc_intf_set_pwrm_response response; 602 int ret; 603 u16 result_code; 604 605 memset(&request, 0, sizeof(request)); 606 607 request.intf_id = intf_id; 608 request.hs_series = GB_SVC_UNIPRO_HS_SERIES_A; 609 request.tx_mode = GB_SVC_UNIPRO_HIBERNATE_MODE; 610 request.rx_mode = GB_SVC_UNIPRO_HIBERNATE_MODE; 611 612 ret = gb_operation_sync(svc->connection, GB_SVC_TYPE_INTF_SET_PWRM, 613 &request, sizeof(request), 614 &response, sizeof(response)); 615 if (ret < 0) { 616 dev_err(&svc->dev, 617 "failed to send set power mode operation to interface %u: %d\n", 618 intf_id, ret); 619 return ret; 620 } 621 622 result_code = response.result_code; 623 if (result_code != GB_SVC_SETPWRM_PWR_OK) { 624 dev_err(&svc->dev, 625 "failed to hibernate the link for interface %u: %u\n", 626 intf_id, result_code); 627 return -EIO; 628 } 629 630 return 0; 631} 632 633int gb_svc_ping(struct gb_svc *svc) 634{ 635 return gb_operation_sync_timeout(svc->connection, GB_SVC_TYPE_PING, 636 NULL, 0, NULL, 0, 637 GB_OPERATION_TIMEOUT_DEFAULT * 2); 638} 639 640static int gb_svc_version_request(struct gb_operation *op) 641{ 642 struct gb_connection *connection = op->connection; 643 struct gb_svc *svc = gb_connection_get_data(connection); 644 struct gb_svc_version_request *request; 645 struct gb_svc_version_response *response; 646 647 if (op->request->payload_size < sizeof(*request)) { 648 dev_err(&svc->dev, "short version request (%zu < %zu)\n", 649 op->request->payload_size, 650 sizeof(*request)); 651 return -EINVAL; 652 } 653 654 request = op->request->payload; 655 656 if (request->major > GB_SVC_VERSION_MAJOR) { 657 dev_warn(&svc->dev, "unsupported major version (%u > %u)\n", 658 request->major, GB_SVC_VERSION_MAJOR); 659 return -ENOTSUPP; 660 } 661 662 svc->protocol_major = request->major; 663 svc->protocol_minor = request->minor; 664 665 if (!gb_operation_response_alloc(op, sizeof(*response), GFP_KERNEL)) 666 return -ENOMEM; 667 668 response = op->response->payload; 669 response->major = svc->protocol_major; 670 response->minor = svc->protocol_minor; 671 672 return 0; 673} 674 675static ssize_t pwr_debugfs_voltage_read(struct file *file, char __user *buf, 676 size_t len, loff_t *offset) 677{ 678 struct svc_debugfs_pwrmon_rail *pwrmon_rails = 679 file_inode(file)->i_private; 680 struct gb_svc *svc = pwrmon_rails->svc; 681 int ret, desc; 682 u32 value; 683 char buff[16]; 684 685 ret = gb_svc_pwrmon_sample_get(svc, pwrmon_rails->id, 686 GB_SVC_PWRMON_TYPE_VOL, &value); 687 if (ret) { 688 dev_err(&svc->dev, 689 "failed to get voltage sample %u: %d\n", 690 pwrmon_rails->id, ret); 691 return ret; 692 } 693 694 desc = scnprintf(buff, sizeof(buff), "%u\n", value); 695 696 return simple_read_from_buffer(buf, len, offset, buff, desc); 697} 698 699static ssize_t pwr_debugfs_current_read(struct file *file, char __user *buf, 700 size_t len, loff_t *offset) 701{ 702 struct svc_debugfs_pwrmon_rail *pwrmon_rails = 703 file_inode(file)->i_private; 704 struct gb_svc *svc = pwrmon_rails->svc; 705 int ret, desc; 706 u32 value; 707 char buff[16]; 708 709 ret = gb_svc_pwrmon_sample_get(svc, pwrmon_rails->id, 710 GB_SVC_PWRMON_TYPE_CURR, &value); 711 if (ret) { 712 dev_err(&svc->dev, 713 "failed to get current sample %u: %d\n", 714 pwrmon_rails->id, ret); 715 return ret; 716 } 717 718 desc = scnprintf(buff, sizeof(buff), "%u\n", value); 719 720 return simple_read_from_buffer(buf, len, offset, buff, desc); 721} 722 723static ssize_t pwr_debugfs_power_read(struct file *file, char __user *buf, 724 size_t len, loff_t *offset) 725{ 726 struct svc_debugfs_pwrmon_rail *pwrmon_rails = 727 file_inode(file)->i_private; 728 struct gb_svc *svc = pwrmon_rails->svc; 729 int ret, desc; 730 u32 value; 731 char buff[16]; 732 733 ret = gb_svc_pwrmon_sample_get(svc, pwrmon_rails->id, 734 GB_SVC_PWRMON_TYPE_PWR, &value); 735 if (ret) { 736 dev_err(&svc->dev, "failed to get power sample %u: %d\n", 737 pwrmon_rails->id, ret); 738 return ret; 739 } 740 741 desc = scnprintf(buff, sizeof(buff), "%u\n", value); 742 743 return simple_read_from_buffer(buf, len, offset, buff, desc); 744} 745 746static const struct file_operations pwrmon_debugfs_voltage_fops = { 747 .read = pwr_debugfs_voltage_read, 748}; 749 750static const struct file_operations pwrmon_debugfs_current_fops = { 751 .read = pwr_debugfs_current_read, 752}; 753 754static const struct file_operations pwrmon_debugfs_power_fops = { 755 .read = pwr_debugfs_power_read, 756}; 757 758static void gb_svc_pwrmon_debugfs_init(struct gb_svc *svc) 759{ 760 int i; 761 size_t bufsize; 762 struct dentry *dent; 763 struct gb_svc_pwrmon_rail_names_get_response *rail_names; 764 u8 rail_count; 765 766 dent = debugfs_create_dir("pwrmon", svc->debugfs_dentry); 767 if (IS_ERR_OR_NULL(dent)) 768 return; 769 770 if (gb_svc_pwrmon_rail_count_get(svc, &rail_count)) 771 goto err_pwrmon_debugfs; 772 773 if (!rail_count || rail_count > GB_SVC_PWRMON_MAX_RAIL_COUNT) 774 goto err_pwrmon_debugfs; 775 776 bufsize = sizeof(*rail_names) + 777 GB_SVC_PWRMON_RAIL_NAME_BUFSIZE * rail_count; 778 779 rail_names = kzalloc(bufsize, GFP_KERNEL); 780 if (!rail_names) 781 goto err_pwrmon_debugfs; 782 783 svc->pwrmon_rails = kcalloc(rail_count, sizeof(*svc->pwrmon_rails), 784 GFP_KERNEL); 785 if (!svc->pwrmon_rails) 786 goto err_pwrmon_debugfs_free; 787 788 if (gb_svc_pwrmon_rail_names_get(svc, rail_names, bufsize)) 789 goto err_pwrmon_debugfs_free; 790 791 for (i = 0; i < rail_count; i++) { 792 struct dentry *dir; 793 struct svc_debugfs_pwrmon_rail *rail = &svc->pwrmon_rails[i]; 794 char fname[GB_SVC_PWRMON_RAIL_NAME_BUFSIZE]; 795 796 snprintf(fname, sizeof(fname), "%s", 797 (char *)&rail_names->name[i]); 798 799 rail->id = i; 800 rail->svc = svc; 801 802 dir = debugfs_create_dir(fname, dent); 803 debugfs_create_file("voltage_now", 0444, dir, rail, 804 &pwrmon_debugfs_voltage_fops); 805 debugfs_create_file("current_now", 0444, dir, rail, 806 &pwrmon_debugfs_current_fops); 807 debugfs_create_file("power_now", 0444, dir, rail, 808 &pwrmon_debugfs_power_fops); 809 } 810 811 kfree(rail_names); 812 return; 813 814err_pwrmon_debugfs_free: 815 kfree(rail_names); 816 kfree(svc->pwrmon_rails); 817 svc->pwrmon_rails = NULL; 818 819err_pwrmon_debugfs: 820 debugfs_remove(dent); 821} 822 823static void gb_svc_debugfs_init(struct gb_svc *svc) 824{ 825 svc->debugfs_dentry = debugfs_create_dir(dev_name(&svc->dev), 826 gb_debugfs_get()); 827 gb_svc_pwrmon_debugfs_init(svc); 828} 829 830static void gb_svc_debugfs_exit(struct gb_svc *svc) 831{ 832 debugfs_remove_recursive(svc->debugfs_dentry); 833 kfree(svc->pwrmon_rails); 834 svc->pwrmon_rails = NULL; 835} 836 837static int gb_svc_hello(struct gb_operation *op) 838{ 839 struct gb_connection *connection = op->connection; 840 struct gb_svc *svc = gb_connection_get_data(connection); 841 struct gb_svc_hello_request *hello_request; 842 int ret; 843 844 if (op->request->payload_size < sizeof(*hello_request)) { 845 dev_warn(&svc->dev, "short hello request (%zu < %zu)\n", 846 op->request->payload_size, 847 sizeof(*hello_request)); 848 return -EINVAL; 849 } 850 851 hello_request = op->request->payload; 852 svc->endo_id = le16_to_cpu(hello_request->endo_id); 853 svc->ap_intf_id = hello_request->interface_id; 854 855 ret = device_add(&svc->dev); 856 if (ret) { 857 dev_err(&svc->dev, "failed to register svc device: %d\n", ret); 858 return ret; 859 } 860 861 ret = gb_svc_watchdog_create(svc); 862 if (ret) { 863 dev_err(&svc->dev, "failed to create watchdog: %d\n", ret); 864 goto err_unregister_device; 865 } 866 867 gb_svc_debugfs_init(svc); 868 869 ret = gb_svc_queue_deferred_request(op); 870 if (ret) 871 goto err_remove_debugfs; 872 873 return 0; 874 875err_remove_debugfs: 876 gb_svc_debugfs_exit(svc); 877err_unregister_device: 878 gb_svc_watchdog_destroy(svc); 879 device_del(&svc->dev); 880 return ret; 881} 882 883static struct gb_interface *gb_svc_interface_lookup(struct gb_svc *svc, 884 u8 intf_id) 885{ 886 struct gb_host_device *hd = svc->hd; 887 struct gb_module *module; 888 size_t num_interfaces; 889 u8 module_id; 890 891 list_for_each_entry(module, &hd->modules, hd_node) { 892 module_id = module->module_id; 893 num_interfaces = module->num_interfaces; 894 895 if (intf_id >= module_id && 896 intf_id < module_id + num_interfaces) { 897 return module->interfaces[intf_id - module_id]; 898 } 899 } 900 901 return NULL; 902} 903 904static struct gb_module *gb_svc_module_lookup(struct gb_svc *svc, u8 module_id) 905{ 906 struct gb_host_device *hd = svc->hd; 907 struct gb_module *module; 908 909 list_for_each_entry(module, &hd->modules, hd_node) { 910 if (module->module_id == module_id) 911 return module; 912 } 913 914 return NULL; 915} 916 917static void gb_svc_process_hello_deferred(struct gb_operation *operation) 918{ 919 struct gb_connection *connection = operation->connection; 920 struct gb_svc *svc = gb_connection_get_data(connection); 921 int ret; 922 923 /* 924 * XXX This is a hack/work-around to reconfigure the APBridgeA-Switch 925 * link to PWM G2, 1 Lane, Slow Auto, so that it has sufficient 926 * bandwidth for 3 audio streams plus boot-over-UniPro of a hot-plugged 927 * module. 928 * 929 * The code should be removed once SW-2217, Heuristic for UniPro 930 * Power Mode Changes is resolved. 931 */ 932 ret = gb_svc_intf_set_power_mode(svc, svc->ap_intf_id, 933 GB_SVC_UNIPRO_HS_SERIES_A, 934 GB_SVC_UNIPRO_SLOW_AUTO_MODE, 935 2, 1, 936 GB_SVC_SMALL_AMPLITUDE, 937 GB_SVC_NO_DE_EMPHASIS, 938 GB_SVC_UNIPRO_SLOW_AUTO_MODE, 939 2, 1, 940 0, 0, 941 NULL, NULL); 942 943 if (ret) 944 dev_warn(&svc->dev, 945 "power mode change failed on AP to switch link: %d\n", 946 ret); 947} 948 949static void gb_svc_process_module_inserted(struct gb_operation *operation) 950{ 951 struct gb_svc_module_inserted_request *request; 952 struct gb_connection *connection = operation->connection; 953 struct gb_svc *svc = gb_connection_get_data(connection); 954 struct gb_host_device *hd = svc->hd; 955 struct gb_module *module; 956 size_t num_interfaces; 957 u8 module_id; 958 u16 flags; 959 int ret; 960 961 /* The request message size has already been verified. */ 962 request = operation->request->payload; 963 module_id = request->primary_intf_id; 964 num_interfaces = request->intf_count; 965 flags = le16_to_cpu(request->flags); 966 967 dev_dbg(&svc->dev, "%s - id = %u, num_interfaces = %zu, flags = 0x%04x\n", 968 __func__, module_id, num_interfaces, flags); 969 970 if (flags & GB_SVC_MODULE_INSERTED_FLAG_NO_PRIMARY) { 971 dev_warn(&svc->dev, "no primary interface detected on module %u\n", 972 module_id); 973 } 974 975 module = gb_svc_module_lookup(svc, module_id); 976 if (module) { 977 dev_warn(&svc->dev, "unexpected module-inserted event %u\n", 978 module_id); 979 return; 980 } 981 982 module = gb_module_create(hd, module_id, num_interfaces); 983 if (!module) { 984 dev_err(&svc->dev, "failed to create module\n"); 985 return; 986 } 987 988 ret = gb_module_add(module); 989 if (ret) { 990 gb_module_put(module); 991 return; 992 } 993 994 list_add(&module->hd_node, &hd->modules); 995} 996 997static void gb_svc_process_module_removed(struct gb_operation *operation) 998{ 999 struct gb_svc_module_removed_request *request; 1000 struct gb_connection *connection = operation->connection; 1001 struct gb_svc *svc = gb_connection_get_data(connection); 1002 struct gb_module *module; 1003 u8 module_id; 1004 1005 /* The request message size has already been verified. */ 1006 request = operation->request->payload; 1007 module_id = request->primary_intf_id; 1008 1009 dev_dbg(&svc->dev, "%s - id = %u\n", __func__, module_id); 1010 1011 module = gb_svc_module_lookup(svc, module_id); 1012 if (!module) { 1013 dev_warn(&svc->dev, "unexpected module-removed event %u\n", 1014 module_id); 1015 return; 1016 } 1017 1018 module->disconnected = true; 1019 1020 gb_module_del(module); 1021 list_del(&module->hd_node); 1022 gb_module_put(module); 1023} 1024 1025static void gb_svc_process_intf_oops(struct gb_operation *operation) 1026{ 1027 struct gb_svc_intf_oops_request *request; 1028 struct gb_connection *connection = operation->connection; 1029 struct gb_svc *svc = gb_connection_get_data(connection); 1030 struct gb_interface *intf; 1031 u8 intf_id; 1032 u8 reason; 1033 1034 /* The request message size has already been verified. */ 1035 request = operation->request->payload; 1036 intf_id = request->intf_id; 1037 reason = request->reason; 1038 1039 intf = gb_svc_interface_lookup(svc, intf_id); 1040 if (!intf) { 1041 dev_warn(&svc->dev, "unexpected interface-oops event %u\n", 1042 intf_id); 1043 return; 1044 } 1045 1046 dev_info(&svc->dev, "Deactivating interface %u, interface oops reason = %u\n", 1047 intf_id, reason); 1048 1049 mutex_lock(&intf->mutex); 1050 intf->disconnected = true; 1051 gb_interface_disable(intf); 1052 gb_interface_deactivate(intf); 1053 mutex_unlock(&intf->mutex); 1054} 1055 1056static void gb_svc_process_intf_mailbox_event(struct gb_operation *operation) 1057{ 1058 struct gb_svc_intf_mailbox_event_request *request; 1059 struct gb_connection *connection = operation->connection; 1060 struct gb_svc *svc = gb_connection_get_data(connection); 1061 struct gb_interface *intf; 1062 u8 intf_id; 1063 u16 result_code; 1064 u32 mailbox; 1065 1066 /* The request message size has already been verified. */ 1067 request = operation->request->payload; 1068 intf_id = request->intf_id; 1069 result_code = le16_to_cpu(request->result_code); 1070 mailbox = le32_to_cpu(request->mailbox); 1071 1072 dev_dbg(&svc->dev, "%s - id = %u, result = 0x%04x, mailbox = 0x%08x\n", 1073 __func__, intf_id, result_code, mailbox); 1074 1075 intf = gb_svc_interface_lookup(svc, intf_id); 1076 if (!intf) { 1077 dev_warn(&svc->dev, "unexpected mailbox event %u\n", intf_id); 1078 return; 1079 } 1080 1081 gb_interface_mailbox_event(intf, result_code, mailbox); 1082} 1083 1084static void gb_svc_process_deferred_request(struct work_struct *work) 1085{ 1086 struct gb_svc_deferred_request *dr; 1087 struct gb_operation *operation; 1088 struct gb_svc *svc; 1089 u8 type; 1090 1091 dr = container_of(work, struct gb_svc_deferred_request, work); 1092 operation = dr->operation; 1093 svc = gb_connection_get_data(operation->connection); 1094 type = operation->request->header->type; 1095 1096 switch (type) { 1097 case GB_SVC_TYPE_SVC_HELLO: 1098 gb_svc_process_hello_deferred(operation); 1099 break; 1100 case GB_SVC_TYPE_MODULE_INSERTED: 1101 gb_svc_process_module_inserted(operation); 1102 break; 1103 case GB_SVC_TYPE_MODULE_REMOVED: 1104 gb_svc_process_module_removed(operation); 1105 break; 1106 case GB_SVC_TYPE_INTF_MAILBOX_EVENT: 1107 gb_svc_process_intf_mailbox_event(operation); 1108 break; 1109 case GB_SVC_TYPE_INTF_OOPS: 1110 gb_svc_process_intf_oops(operation); 1111 break; 1112 default: 1113 dev_err(&svc->dev, "bad deferred request type: 0x%02x\n", type); 1114 } 1115 1116 gb_operation_put(operation); 1117 kfree(dr); 1118} 1119 1120static int gb_svc_queue_deferred_request(struct gb_operation *operation) 1121{ 1122 struct gb_svc *svc = gb_connection_get_data(operation->connection); 1123 struct gb_svc_deferred_request *dr; 1124 1125 dr = kmalloc(sizeof(*dr), GFP_KERNEL); 1126 if (!dr) 1127 return -ENOMEM; 1128 1129 gb_operation_get(operation); 1130 1131 dr->operation = operation; 1132 INIT_WORK(&dr->work, gb_svc_process_deferred_request); 1133 1134 queue_work(svc->wq, &dr->work); 1135 1136 return 0; 1137} 1138 1139static int gb_svc_intf_reset_recv(struct gb_operation *op) 1140{ 1141 struct gb_svc *svc = gb_connection_get_data(op->connection); 1142 struct gb_message *request = op->request; 1143 struct gb_svc_intf_reset_request *reset; 1144 1145 if (request->payload_size < sizeof(*reset)) { 1146 dev_warn(&svc->dev, "short reset request received (%zu < %zu)\n", 1147 request->payload_size, sizeof(*reset)); 1148 return -EINVAL; 1149 } 1150 reset = request->payload; 1151 1152 /* FIXME Reset the interface here */ 1153 1154 return 0; 1155} 1156 1157static int gb_svc_module_inserted_recv(struct gb_operation *op) 1158{ 1159 struct gb_svc *svc = gb_connection_get_data(op->connection); 1160 struct gb_svc_module_inserted_request *request; 1161 1162 if (op->request->payload_size < sizeof(*request)) { 1163 dev_warn(&svc->dev, "short module-inserted request received (%zu < %zu)\n", 1164 op->request->payload_size, sizeof(*request)); 1165 return -EINVAL; 1166 } 1167 1168 request = op->request->payload; 1169 1170 dev_dbg(&svc->dev, "%s - id = %u\n", __func__, 1171 request->primary_intf_id); 1172 1173 return gb_svc_queue_deferred_request(op); 1174} 1175 1176static int gb_svc_module_removed_recv(struct gb_operation *op) 1177{ 1178 struct gb_svc *svc = gb_connection_get_data(op->connection); 1179 struct gb_svc_module_removed_request *request; 1180 1181 if (op->request->payload_size < sizeof(*request)) { 1182 dev_warn(&svc->dev, "short module-removed request received (%zu < %zu)\n", 1183 op->request->payload_size, sizeof(*request)); 1184 return -EINVAL; 1185 } 1186 1187 request = op->request->payload; 1188 1189 dev_dbg(&svc->dev, "%s - id = %u\n", __func__, 1190 request->primary_intf_id); 1191 1192 return gb_svc_queue_deferred_request(op); 1193} 1194 1195static int gb_svc_intf_oops_recv(struct gb_operation *op) 1196{ 1197 struct gb_svc *svc = gb_connection_get_data(op->connection); 1198 struct gb_svc_intf_oops_request *request; 1199 1200 if (op->request->payload_size < sizeof(*request)) { 1201 dev_warn(&svc->dev, "short intf-oops request received (%zu < %zu)\n", 1202 op->request->payload_size, sizeof(*request)); 1203 return -EINVAL; 1204 } 1205 1206 return gb_svc_queue_deferred_request(op); 1207} 1208 1209static int gb_svc_intf_mailbox_event_recv(struct gb_operation *op) 1210{ 1211 struct gb_svc *svc = gb_connection_get_data(op->connection); 1212 struct gb_svc_intf_mailbox_event_request *request; 1213 1214 if (op->request->payload_size < sizeof(*request)) { 1215 dev_warn(&svc->dev, "short mailbox request received (%zu < %zu)\n", 1216 op->request->payload_size, sizeof(*request)); 1217 return -EINVAL; 1218 } 1219 1220 request = op->request->payload; 1221 1222 dev_dbg(&svc->dev, "%s - id = %u\n", __func__, request->intf_id); 1223 1224 return gb_svc_queue_deferred_request(op); 1225} 1226 1227static int gb_svc_request_handler(struct gb_operation *op) 1228{ 1229 struct gb_connection *connection = op->connection; 1230 struct gb_svc *svc = gb_connection_get_data(connection); 1231 u8 type = op->type; 1232 int ret = 0; 1233 1234 /* 1235 * SVC requests need to follow a specific order (at least initially) and 1236 * below code takes care of enforcing that. The expected order is: 1237 * - PROTOCOL_VERSION 1238 * - SVC_HELLO 1239 * - Any other request, but the earlier two. 1240 * 1241 * Incoming requests are guaranteed to be serialized and so we don't 1242 * need to protect 'state' for any races. 1243 */ 1244 switch (type) { 1245 case GB_SVC_TYPE_PROTOCOL_VERSION: 1246 if (svc->state != GB_SVC_STATE_RESET) 1247 ret = -EINVAL; 1248 break; 1249 case GB_SVC_TYPE_SVC_HELLO: 1250 if (svc->state != GB_SVC_STATE_PROTOCOL_VERSION) 1251 ret = -EINVAL; 1252 break; 1253 default: 1254 if (svc->state != GB_SVC_STATE_SVC_HELLO) 1255 ret = -EINVAL; 1256 break; 1257 } 1258 1259 if (ret) { 1260 dev_warn(&svc->dev, "unexpected request 0x%02x received (state %u)\n", 1261 type, svc->state); 1262 return ret; 1263 } 1264 1265 switch (type) { 1266 case GB_SVC_TYPE_PROTOCOL_VERSION: 1267 ret = gb_svc_version_request(op); 1268 if (!ret) 1269 svc->state = GB_SVC_STATE_PROTOCOL_VERSION; 1270 return ret; 1271 case GB_SVC_TYPE_SVC_HELLO: 1272 ret = gb_svc_hello(op); 1273 if (!ret) 1274 svc->state = GB_SVC_STATE_SVC_HELLO; 1275 return ret; 1276 case GB_SVC_TYPE_INTF_RESET: 1277 return gb_svc_intf_reset_recv(op); 1278 case GB_SVC_TYPE_MODULE_INSERTED: 1279 return gb_svc_module_inserted_recv(op); 1280 case GB_SVC_TYPE_MODULE_REMOVED: 1281 return gb_svc_module_removed_recv(op); 1282 case GB_SVC_TYPE_INTF_MAILBOX_EVENT: 1283 return gb_svc_intf_mailbox_event_recv(op); 1284 case GB_SVC_TYPE_INTF_OOPS: 1285 return gb_svc_intf_oops_recv(op); 1286 default: 1287 dev_warn(&svc->dev, "unsupported request 0x%02x\n", type); 1288 return -EINVAL; 1289 } 1290} 1291 1292static void gb_svc_release(struct device *dev) 1293{ 1294 struct gb_svc *svc = to_gb_svc(dev); 1295 1296 if (svc->connection) 1297 gb_connection_destroy(svc->connection); 1298 ida_destroy(&svc->device_id_map); 1299 destroy_workqueue(svc->wq); 1300 kfree(svc); 1301} 1302 1303struct device_type greybus_svc_type = { 1304 .name = "greybus_svc", 1305 .release = gb_svc_release, 1306}; 1307 1308struct gb_svc *gb_svc_create(struct gb_host_device *hd) 1309{ 1310 struct gb_svc *svc; 1311 1312 svc = kzalloc(sizeof(*svc), GFP_KERNEL); 1313 if (!svc) 1314 return NULL; 1315 1316 svc->wq = alloc_workqueue("%s:svc", WQ_UNBOUND, 1, dev_name(&hd->dev)); 1317 if (!svc->wq) { 1318 kfree(svc); 1319 return NULL; 1320 } 1321 1322 svc->dev.parent = &hd->dev; 1323 svc->dev.bus = &greybus_bus_type; 1324 svc->dev.type = &greybus_svc_type; 1325 svc->dev.groups = svc_groups; 1326 svc->dev.dma_mask = svc->dev.parent->dma_mask; 1327 device_initialize(&svc->dev); 1328 1329 dev_set_name(&svc->dev, "%d-svc", hd->bus_id); 1330 1331 ida_init(&svc->device_id_map); 1332 svc->state = GB_SVC_STATE_RESET; 1333 svc->hd = hd; 1334 1335 svc->connection = gb_connection_create_static(hd, GB_SVC_CPORT_ID, 1336 gb_svc_request_handler); 1337 if (IS_ERR(svc->connection)) { 1338 dev_err(&svc->dev, "failed to create connection: %ld\n", 1339 PTR_ERR(svc->connection)); 1340 goto err_put_device; 1341 } 1342 1343 gb_connection_set_data(svc->connection, svc); 1344 1345 return svc; 1346 1347err_put_device: 1348 put_device(&svc->dev); 1349 return NULL; 1350} 1351 1352int gb_svc_add(struct gb_svc *svc) 1353{ 1354 int ret; 1355 1356 /* 1357 * The SVC protocol is currently driven by the SVC, so the SVC device 1358 * is added from the connection request handler when enough 1359 * information has been received. 1360 */ 1361 ret = gb_connection_enable(svc->connection); 1362 if (ret) 1363 return ret; 1364 1365 return 0; 1366} 1367 1368static void gb_svc_remove_modules(struct gb_svc *svc) 1369{ 1370 struct gb_host_device *hd = svc->hd; 1371 struct gb_module *module, *tmp; 1372 1373 list_for_each_entry_safe(module, tmp, &hd->modules, hd_node) { 1374 gb_module_del(module); 1375 list_del(&module->hd_node); 1376 gb_module_put(module); 1377 } 1378} 1379 1380void gb_svc_del(struct gb_svc *svc) 1381{ 1382 gb_connection_disable_rx(svc->connection); 1383 1384 /* 1385 * The SVC device may have been registered from the request handler. 1386 */ 1387 if (device_is_registered(&svc->dev)) { 1388 gb_svc_debugfs_exit(svc); 1389 gb_svc_watchdog_destroy(svc); 1390 device_del(&svc->dev); 1391 } 1392 1393 flush_workqueue(svc->wq); 1394 1395 gb_svc_remove_modules(svc); 1396 1397 gb_connection_disable(svc->connection); 1398} 1399 1400void gb_svc_put(struct gb_svc *svc) 1401{ 1402 put_device(&svc->dev); 1403} 1404