1 // SPDX-License-Identifier: GPL-2.0 2 /* 3 * Greybus "AP" USB driver for "ES2" controller chips 4 * 5 * Copyright 2014-2015 Google Inc. 6 * Copyright 2014-2015 Linaro Ltd. 7 */ 8 #include <linux/kthread.h> 9 #include <linux/sizes.h> 10 #include <linux/usb.h> 11 #include <linux/kfifo.h> 12 #include <linux/debugfs.h> 13 #include <linux/list.h> 14 #include <linux/greybus.h> 15 #include <asm/unaligned.h> 16 17 #include "arpc.h" 18 #include "greybus_trace.h" 19 20 21 /* Default timeout for USB vendor requests. */ 22 #define ES2_USB_CTRL_TIMEOUT 500 23 24 /* Default timeout for ARPC CPort requests */ 25 #define ES2_ARPC_CPORT_TIMEOUT 500 26 27 /* Fixed CPort numbers */ 28 #define ES2_CPORT_CDSI0 16 29 #define ES2_CPORT_CDSI1 17 30 31 /* Memory sizes for the buffers sent to/from the ES2 controller */ 32 #define ES2_GBUF_MSG_SIZE_MAX 2048 33 34 /* Memory sizes for the ARPC buffers */ 35 #define ARPC_OUT_SIZE_MAX U16_MAX 36 #define ARPC_IN_SIZE_MAX 128 37 38 static const struct usb_device_id id_table[] = { 39 { USB_DEVICE(0x18d1, 0x1eaf) }, 40 { }, 41 }; 42 MODULE_DEVICE_TABLE(usb, id_table); 43 44 #define APB1_LOG_SIZE SZ_16K 45 46 /* 47 * Number of CPort IN urbs in flight at any point in time. 48 * Adjust if we are having stalls in the USB buffer due to not enough urbs in 49 * flight. 50 */ 51 #define NUM_CPORT_IN_URB 4 52 53 /* Number of CPort OUT urbs in flight at any point in time. 54 * Adjust if we get messages saying we are out of urbs in the system log. 55 */ 56 #define NUM_CPORT_OUT_URB 8 57 58 /* 59 * Number of ARPC in urbs in flight at any point in time. 60 */ 61 #define NUM_ARPC_IN_URB 2 62 63 /* 64 * @endpoint: bulk in endpoint for CPort data 65 * @urb: array of urbs for the CPort in messages 66 * @buffer: array of buffers for the @cport_in_urb urbs 67 */ 68 struct es2_cport_in { 69 __u8 endpoint; 70 struct urb *urb[NUM_CPORT_IN_URB]; 71 u8 *buffer[NUM_CPORT_IN_URB]; 72 }; 73 74 /** 75 * struct es2_ap_dev - ES2 USB Bridge to AP structure 76 * @usb_dev: pointer to the USB device we are. 77 * @usb_intf: pointer to the USB interface we are bound to. 78 * @hd: pointer to our gb_host_device structure 79 * 80 * @cport_in: endpoint, urbs and buffer for cport in messages 81 * @cport_out_endpoint: endpoint for for cport out messages 82 * @cport_out_urb: array of urbs for the CPort out messages 83 * @cport_out_urb_busy: array of flags to see if the @cport_out_urb is busy or 84 * not. 85 * @cport_out_urb_cancelled: array of flags indicating whether the 86 * corresponding @cport_out_urb is being cancelled 87 * @cport_out_urb_lock: locks the @cport_out_urb_busy "list" 88 * @cdsi1_in_use: true if cport CDSI1 is in use 89 * @apb_log_task: task pointer for logging thread 90 * @apb_log_dentry: file system entry for the log file interface 91 * @apb_log_enable_dentry: file system entry for enabling logging 92 * @apb_log_fifo: kernel FIFO to carry logged data 93 * @arpc_urb: array of urbs for the ARPC in messages 94 * @arpc_buffer: array of buffers for the @arpc_urb urbs 95 * @arpc_endpoint_in: bulk in endpoint for APBridgeA RPC 96 * @arpc_id_cycle: gives an unique id to ARPC 97 * @arpc_lock: locks ARPC list 98 * @arpcs: list of in progress ARPCs 99 */ 100 struct es2_ap_dev { 101 struct usb_device *usb_dev; 102 struct usb_interface *usb_intf; 103 struct gb_host_device *hd; 104 105 struct es2_cport_in cport_in; 106 __u8 cport_out_endpoint; 107 struct urb *cport_out_urb[NUM_CPORT_OUT_URB]; 108 bool cport_out_urb_busy[NUM_CPORT_OUT_URB]; 109 bool cport_out_urb_cancelled[NUM_CPORT_OUT_URB]; 110 spinlock_t cport_out_urb_lock; 111 112 bool cdsi1_in_use; 113 114 struct task_struct *apb_log_task; 115 struct dentry *apb_log_dentry; 116 struct dentry *apb_log_enable_dentry; 117 DECLARE_KFIFO(apb_log_fifo, char, APB1_LOG_SIZE); 118 119 __u8 arpc_endpoint_in; 120 struct urb *arpc_urb[NUM_ARPC_IN_URB]; 121 u8 *arpc_buffer[NUM_ARPC_IN_URB]; 122 123 int arpc_id_cycle; 124 spinlock_t arpc_lock; 125 struct list_head arpcs; 126 }; 127 128 struct arpc { 129 struct list_head list; 130 struct arpc_request_message *req; 131 struct arpc_response_message *resp; 132 struct completion response_received; 133 bool active; 134 }; 135 136 static inline struct es2_ap_dev *hd_to_es2(struct gb_host_device *hd) 137 { 138 return (struct es2_ap_dev *)&hd->hd_priv; 139 } 140 141 static void cport_out_callback(struct urb *urb); 142 static void usb_log_enable(struct es2_ap_dev *es2); 143 static void usb_log_disable(struct es2_ap_dev *es2); 144 static int arpc_sync(struct es2_ap_dev *es2, u8 type, void *payload, 145 size_t size, int *result, unsigned int timeout); 146 147 static int output_sync(struct es2_ap_dev *es2, void *req, u16 size, u8 cmd) 148 { 149 struct usb_device *udev = es2->usb_dev; 150 u8 *data; 151 int retval; 152 153 data = kmemdup(req, size, GFP_KERNEL); 154 if (!data) 155 return -ENOMEM; 156 157 retval = usb_control_msg(udev, usb_sndctrlpipe(udev, 0), 158 cmd, 159 USB_DIR_OUT | USB_TYPE_VENDOR | 160 USB_RECIP_INTERFACE, 161 0, 0, data, size, ES2_USB_CTRL_TIMEOUT); 162 if (retval < 0) 163 dev_err(&udev->dev, "%s: return error %d\n", __func__, retval); 164 else 165 retval = 0; 166 167 kfree(data); 168 return retval; 169 } 170 171 static void ap_urb_complete(struct urb *urb) 172 { 173 struct usb_ctrlrequest *dr = urb->context; 174 175 kfree(dr); 176 usb_free_urb(urb); 177 } 178 179 static int output_async(struct es2_ap_dev *es2, void *req, u16 size, u8 cmd) 180 { 181 struct usb_device *udev = es2->usb_dev; 182 struct urb *urb; 183 struct usb_ctrlrequest *dr; 184 u8 *buf; 185 int retval; 186 187 urb = usb_alloc_urb(0, GFP_ATOMIC); 188 if (!urb) 189 return -ENOMEM; 190 191 dr = kmalloc(sizeof(*dr) + size, GFP_ATOMIC); 192 if (!dr) { 193 usb_free_urb(urb); 194 return -ENOMEM; 195 } 196 197 buf = (u8 *)dr + sizeof(*dr); 198 memcpy(buf, req, size); 199 200 dr->bRequest = cmd; 201 dr->bRequestType = USB_DIR_OUT | USB_TYPE_VENDOR | USB_RECIP_INTERFACE; 202 dr->wValue = 0; 203 dr->wIndex = 0; 204 dr->wLength = cpu_to_le16(size); 205 206 usb_fill_control_urb(urb, udev, usb_sndctrlpipe(udev, 0), 207 (unsigned char *)dr, buf, size, 208 ap_urb_complete, dr); 209 retval = usb_submit_urb(urb, GFP_ATOMIC); 210 if (retval) { 211 usb_free_urb(urb); 212 kfree(dr); 213 } 214 return retval; 215 } 216 217 static int output(struct gb_host_device *hd, void *req, u16 size, u8 cmd, 218 bool async) 219 { 220 struct es2_ap_dev *es2 = hd_to_es2(hd); 221 222 if (async) 223 return output_async(es2, req, size, cmd); 224 225 return output_sync(es2, req, size, cmd); 226 } 227 228 static int es2_cport_in_enable(struct es2_ap_dev *es2, 229 struct es2_cport_in *cport_in) 230 { 231 struct urb *urb; 232 int ret; 233 int i; 234 235 for (i = 0; i < NUM_CPORT_IN_URB; ++i) { 236 urb = cport_in->urb[i]; 237 238 ret = usb_submit_urb(urb, GFP_KERNEL); 239 if (ret) { 240 dev_err(&es2->usb_dev->dev, 241 "failed to submit in-urb: %d\n", ret); 242 goto err_kill_urbs; 243 } 244 } 245 246 return 0; 247 248 err_kill_urbs: 249 for (--i; i >= 0; --i) { 250 urb = cport_in->urb[i]; 251 usb_kill_urb(urb); 252 } 253 254 return ret; 255 } 256 257 static void es2_cport_in_disable(struct es2_ap_dev *es2, 258 struct es2_cport_in *cport_in) 259 { 260 struct urb *urb; 261 int i; 262 263 for (i = 0; i < NUM_CPORT_IN_URB; ++i) { 264 urb = cport_in->urb[i]; 265 usb_kill_urb(urb); 266 } 267 } 268 269 static int es2_arpc_in_enable(struct es2_ap_dev *es2) 270 { 271 struct urb *urb; 272 int ret; 273 int i; 274 275 for (i = 0; i < NUM_ARPC_IN_URB; ++i) { 276 urb = es2->arpc_urb[i]; 277 278 ret = usb_submit_urb(urb, GFP_KERNEL); 279 if (ret) { 280 dev_err(&es2->usb_dev->dev, 281 "failed to submit arpc in-urb: %d\n", ret); 282 goto err_kill_urbs; 283 } 284 } 285 286 return 0; 287 288 err_kill_urbs: 289 for (--i; i >= 0; --i) { 290 urb = es2->arpc_urb[i]; 291 usb_kill_urb(urb); 292 } 293 294 return ret; 295 } 296 297 static void es2_arpc_in_disable(struct es2_ap_dev *es2) 298 { 299 struct urb *urb; 300 int i; 301 302 for (i = 0; i < NUM_ARPC_IN_URB; ++i) { 303 urb = es2->arpc_urb[i]; 304 usb_kill_urb(urb); 305 } 306 } 307 308 static struct urb *next_free_urb(struct es2_ap_dev *es2, gfp_t gfp_mask) 309 { 310 struct urb *urb = NULL; 311 unsigned long flags; 312 int i; 313 314 spin_lock_irqsave(&es2->cport_out_urb_lock, flags); 315 316 /* Look in our pool of allocated urbs first, as that's the "fastest" */ 317 for (i = 0; i < NUM_CPORT_OUT_URB; ++i) { 318 if (!es2->cport_out_urb_busy[i] && 319 !es2->cport_out_urb_cancelled[i]) { 320 es2->cport_out_urb_busy[i] = true; 321 urb = es2->cport_out_urb[i]; 322 break; 323 } 324 } 325 spin_unlock_irqrestore(&es2->cport_out_urb_lock, flags); 326 if (urb) 327 return urb; 328 329 /* 330 * Crap, pool is empty, complain to the syslog and go allocate one 331 * dynamically as we have to succeed. 332 */ 333 dev_dbg(&es2->usb_dev->dev, 334 "No free CPort OUT urbs, having to dynamically allocate one!\n"); 335 return usb_alloc_urb(0, gfp_mask); 336 } 337 338 static void free_urb(struct es2_ap_dev *es2, struct urb *urb) 339 { 340 unsigned long flags; 341 int i; 342 /* 343 * See if this was an urb in our pool, if so mark it "free", otherwise 344 * we need to free it ourselves. 345 */ 346 spin_lock_irqsave(&es2->cport_out_urb_lock, flags); 347 for (i = 0; i < NUM_CPORT_OUT_URB; ++i) { 348 if (urb == es2->cport_out_urb[i]) { 349 es2->cport_out_urb_busy[i] = false; 350 urb = NULL; 351 break; 352 } 353 } 354 spin_unlock_irqrestore(&es2->cport_out_urb_lock, flags); 355 356 /* If urb is not NULL, then we need to free this urb */ 357 usb_free_urb(urb); 358 } 359 360 /* 361 * We (ab)use the operation-message header pad bytes to transfer the 362 * cport id in order to minimise overhead. 363 */ 364 static void 365 gb_message_cport_pack(struct gb_operation_msg_hdr *header, u16 cport_id) 366 { 367 header->pad[0] = cport_id; 368 } 369 370 /* Clear the pad bytes used for the CPort id */ 371 static void gb_message_cport_clear(struct gb_operation_msg_hdr *header) 372 { 373 header->pad[0] = 0; 374 } 375 376 /* Extract the CPort id packed into the header, and clear it */ 377 static u16 gb_message_cport_unpack(struct gb_operation_msg_hdr *header) 378 { 379 u16 cport_id = header->pad[0]; 380 381 gb_message_cport_clear(header); 382 383 return cport_id; 384 } 385 386 /* 387 * Returns zero if the message was successfully queued, or a negative errno 388 * otherwise. 389 */ 390 static int message_send(struct gb_host_device *hd, u16 cport_id, 391 struct gb_message *message, gfp_t gfp_mask) 392 { 393 struct es2_ap_dev *es2 = hd_to_es2(hd); 394 struct usb_device *udev = es2->usb_dev; 395 size_t buffer_size; 396 int retval; 397 struct urb *urb; 398 unsigned long flags; 399 400 /* 401 * The data actually transferred will include an indication 402 * of where the data should be sent. Do one last check of 403 * the target CPort id before filling it in. 404 */ 405 if (!cport_id_valid(hd, cport_id)) { 406 dev_err(&udev->dev, "invalid cport %u\n", cport_id); 407 return -EINVAL; 408 } 409 410 /* Find a free urb */ 411 urb = next_free_urb(es2, gfp_mask); 412 if (!urb) 413 return -ENOMEM; 414 415 spin_lock_irqsave(&es2->cport_out_urb_lock, flags); 416 message->hcpriv = urb; 417 spin_unlock_irqrestore(&es2->cport_out_urb_lock, flags); 418 419 /* Pack the cport id into the message header */ 420 gb_message_cport_pack(message->header, cport_id); 421 422 buffer_size = sizeof(*message->header) + message->payload_size; 423 424 usb_fill_bulk_urb(urb, udev, 425 usb_sndbulkpipe(udev, 426 es2->cport_out_endpoint), 427 message->buffer, buffer_size, 428 cport_out_callback, message); 429 urb->transfer_flags |= URB_ZERO_PACKET; 430 431 trace_gb_message_submit(message); 432 433 retval = usb_submit_urb(urb, gfp_mask); 434 if (retval) { 435 dev_err(&udev->dev, "failed to submit out-urb: %d\n", retval); 436 437 spin_lock_irqsave(&es2->cport_out_urb_lock, flags); 438 message->hcpriv = NULL; 439 spin_unlock_irqrestore(&es2->cport_out_urb_lock, flags); 440 441 free_urb(es2, urb); 442 gb_message_cport_clear(message->header); 443 444 return retval; 445 } 446 447 return 0; 448 } 449 450 /* 451 * Can not be called in atomic context. 452 */ 453 static void message_cancel(struct gb_message *message) 454 { 455 struct gb_host_device *hd = message->operation->connection->hd; 456 struct es2_ap_dev *es2 = hd_to_es2(hd); 457 struct urb *urb; 458 int i; 459 460 might_sleep(); 461 462 spin_lock_irq(&es2->cport_out_urb_lock); 463 urb = message->hcpriv; 464 465 /* Prevent dynamically allocated urb from being deallocated. */ 466 usb_get_urb(urb); 467 468 /* Prevent pre-allocated urb from being reused. */ 469 for (i = 0; i < NUM_CPORT_OUT_URB; ++i) { 470 if (urb == es2->cport_out_urb[i]) { 471 es2->cport_out_urb_cancelled[i] = true; 472 break; 473 } 474 } 475 spin_unlock_irq(&es2->cport_out_urb_lock); 476 477 usb_kill_urb(urb); 478 479 if (i < NUM_CPORT_OUT_URB) { 480 spin_lock_irq(&es2->cport_out_urb_lock); 481 es2->cport_out_urb_cancelled[i] = false; 482 spin_unlock_irq(&es2->cport_out_urb_lock); 483 } 484 485 usb_free_urb(urb); 486 } 487 488 static int es2_cport_allocate(struct gb_host_device *hd, int cport_id, 489 unsigned long flags) 490 { 491 struct es2_ap_dev *es2 = hd_to_es2(hd); 492 struct ida *id_map = &hd->cport_id_map; 493 int ida_start, ida_end; 494 495 switch (cport_id) { 496 case ES2_CPORT_CDSI0: 497 case ES2_CPORT_CDSI1: 498 dev_err(&hd->dev, "cport %d not available\n", cport_id); 499 return -EBUSY; 500 } 501 502 if (flags & GB_CONNECTION_FLAG_OFFLOADED && 503 flags & GB_CONNECTION_FLAG_CDSI1) { 504 if (es2->cdsi1_in_use) { 505 dev_err(&hd->dev, "CDSI1 already in use\n"); 506 return -EBUSY; 507 } 508 509 es2->cdsi1_in_use = true; 510 511 return ES2_CPORT_CDSI1; 512 } 513 514 if (cport_id < 0) { 515 ida_start = 0; 516 ida_end = hd->num_cports; 517 } else if (cport_id < hd->num_cports) { 518 ida_start = cport_id; 519 ida_end = cport_id + 1; 520 } else { 521 dev_err(&hd->dev, "cport %d not available\n", cport_id); 522 return -EINVAL; 523 } 524 525 return ida_simple_get(id_map, ida_start, ida_end, GFP_KERNEL); 526 } 527 528 static void es2_cport_release(struct gb_host_device *hd, u16 cport_id) 529 { 530 struct es2_ap_dev *es2 = hd_to_es2(hd); 531 532 switch (cport_id) { 533 case ES2_CPORT_CDSI1: 534 es2->cdsi1_in_use = false; 535 return; 536 } 537 538 ida_simple_remove(&hd->cport_id_map, cport_id); 539 } 540 541 static int cport_enable(struct gb_host_device *hd, u16 cport_id, 542 unsigned long flags) 543 { 544 struct es2_ap_dev *es2 = hd_to_es2(hd); 545 struct usb_device *udev = es2->usb_dev; 546 struct gb_apb_request_cport_flags *req; 547 u32 connection_flags; 548 int ret; 549 550 req = kzalloc(sizeof(*req), GFP_KERNEL); 551 if (!req) 552 return -ENOMEM; 553 554 connection_flags = 0; 555 if (flags & GB_CONNECTION_FLAG_CONTROL) 556 connection_flags |= GB_APB_CPORT_FLAG_CONTROL; 557 if (flags & GB_CONNECTION_FLAG_HIGH_PRIO) 558 connection_flags |= GB_APB_CPORT_FLAG_HIGH_PRIO; 559 560 req->flags = cpu_to_le32(connection_flags); 561 562 dev_dbg(&hd->dev, "%s - cport = %u, flags = %02x\n", __func__, 563 cport_id, connection_flags); 564 565 ret = usb_control_msg(udev, usb_sndctrlpipe(udev, 0), 566 GB_APB_REQUEST_CPORT_FLAGS, 567 USB_DIR_OUT | USB_TYPE_VENDOR | 568 USB_RECIP_INTERFACE, cport_id, 0, 569 req, sizeof(*req), ES2_USB_CTRL_TIMEOUT); 570 if (ret < 0) { 571 dev_err(&udev->dev, "failed to set cport flags for port %d\n", 572 cport_id); 573 goto out; 574 } 575 576 ret = 0; 577 out: 578 kfree(req); 579 580 return ret; 581 } 582 583 static int es2_cport_connected(struct gb_host_device *hd, u16 cport_id) 584 { 585 struct es2_ap_dev *es2 = hd_to_es2(hd); 586 struct device *dev = &es2->usb_dev->dev; 587 struct arpc_cport_connected_req req; 588 int ret; 589 590 req.cport_id = cpu_to_le16(cport_id); 591 ret = arpc_sync(es2, ARPC_TYPE_CPORT_CONNECTED, &req, sizeof(req), 592 NULL, ES2_ARPC_CPORT_TIMEOUT); 593 if (ret) { 594 dev_err(dev, "failed to set connected state for cport %u: %d\n", 595 cport_id, ret); 596 return ret; 597 } 598 599 return 0; 600 } 601 602 static int es2_cport_flush(struct gb_host_device *hd, u16 cport_id) 603 { 604 struct es2_ap_dev *es2 = hd_to_es2(hd); 605 struct device *dev = &es2->usb_dev->dev; 606 struct arpc_cport_flush_req req; 607 int ret; 608 609 req.cport_id = cpu_to_le16(cport_id); 610 ret = arpc_sync(es2, ARPC_TYPE_CPORT_FLUSH, &req, sizeof(req), 611 NULL, ES2_ARPC_CPORT_TIMEOUT); 612 if (ret) { 613 dev_err(dev, "failed to flush cport %u: %d\n", cport_id, ret); 614 return ret; 615 } 616 617 return 0; 618 } 619 620 static int es2_cport_shutdown(struct gb_host_device *hd, u16 cport_id, 621 u8 phase, unsigned int timeout) 622 { 623 struct es2_ap_dev *es2 = hd_to_es2(hd); 624 struct device *dev = &es2->usb_dev->dev; 625 struct arpc_cport_shutdown_req req; 626 int result; 627 int ret; 628 629 if (timeout > U16_MAX) 630 return -EINVAL; 631 632 req.cport_id = cpu_to_le16(cport_id); 633 req.timeout = cpu_to_le16(timeout); 634 req.phase = phase; 635 ret = arpc_sync(es2, ARPC_TYPE_CPORT_SHUTDOWN, &req, sizeof(req), 636 &result, ES2_ARPC_CPORT_TIMEOUT + timeout); 637 if (ret) { 638 dev_err(dev, "failed to send shutdown over cport %u: %d (%d)\n", 639 cport_id, ret, result); 640 return ret; 641 } 642 643 return 0; 644 } 645 646 static int es2_cport_quiesce(struct gb_host_device *hd, u16 cport_id, 647 size_t peer_space, unsigned int timeout) 648 { 649 struct es2_ap_dev *es2 = hd_to_es2(hd); 650 struct device *dev = &es2->usb_dev->dev; 651 struct arpc_cport_quiesce_req req; 652 int result; 653 int ret; 654 655 if (peer_space > U16_MAX) 656 return -EINVAL; 657 658 if (timeout > U16_MAX) 659 return -EINVAL; 660 661 req.cport_id = cpu_to_le16(cport_id); 662 req.peer_space = cpu_to_le16(peer_space); 663 req.timeout = cpu_to_le16(timeout); 664 ret = arpc_sync(es2, ARPC_TYPE_CPORT_QUIESCE, &req, sizeof(req), 665 &result, ES2_ARPC_CPORT_TIMEOUT + timeout); 666 if (ret) { 667 dev_err(dev, "failed to quiesce cport %u: %d (%d)\n", 668 cport_id, ret, result); 669 return ret; 670 } 671 672 return 0; 673 } 674 675 static int es2_cport_clear(struct gb_host_device *hd, u16 cport_id) 676 { 677 struct es2_ap_dev *es2 = hd_to_es2(hd); 678 struct device *dev = &es2->usb_dev->dev; 679 struct arpc_cport_clear_req req; 680 int ret; 681 682 req.cport_id = cpu_to_le16(cport_id); 683 ret = arpc_sync(es2, ARPC_TYPE_CPORT_CLEAR, &req, sizeof(req), 684 NULL, ES2_ARPC_CPORT_TIMEOUT); 685 if (ret) { 686 dev_err(dev, "failed to clear cport %u: %d\n", cport_id, ret); 687 return ret; 688 } 689 690 return 0; 691 } 692 693 static int latency_tag_enable(struct gb_host_device *hd, u16 cport_id) 694 { 695 int retval; 696 struct es2_ap_dev *es2 = hd_to_es2(hd); 697 struct usb_device *udev = es2->usb_dev; 698 699 retval = usb_control_msg(udev, usb_sndctrlpipe(udev, 0), 700 GB_APB_REQUEST_LATENCY_TAG_EN, 701 USB_DIR_OUT | USB_TYPE_VENDOR | 702 USB_RECIP_INTERFACE, cport_id, 0, NULL, 703 0, ES2_USB_CTRL_TIMEOUT); 704 705 if (retval < 0) 706 dev_err(&udev->dev, "Cannot enable latency tag for cport %d\n", 707 cport_id); 708 return retval; 709 } 710 711 static int latency_tag_disable(struct gb_host_device *hd, u16 cport_id) 712 { 713 int retval; 714 struct es2_ap_dev *es2 = hd_to_es2(hd); 715 struct usb_device *udev = es2->usb_dev; 716 717 retval = usb_control_msg(udev, usb_sndctrlpipe(udev, 0), 718 GB_APB_REQUEST_LATENCY_TAG_DIS, 719 USB_DIR_OUT | USB_TYPE_VENDOR | 720 USB_RECIP_INTERFACE, cport_id, 0, NULL, 721 0, ES2_USB_CTRL_TIMEOUT); 722 723 if (retval < 0) 724 dev_err(&udev->dev, "Cannot disable latency tag for cport %d\n", 725 cport_id); 726 return retval; 727 } 728 729 static struct gb_hd_driver es2_driver = { 730 .hd_priv_size = sizeof(struct es2_ap_dev), 731 .message_send = message_send, 732 .message_cancel = message_cancel, 733 .cport_allocate = es2_cport_allocate, 734 .cport_release = es2_cport_release, 735 .cport_enable = cport_enable, 736 .cport_connected = es2_cport_connected, 737 .cport_flush = es2_cport_flush, 738 .cport_shutdown = es2_cport_shutdown, 739 .cport_quiesce = es2_cport_quiesce, 740 .cport_clear = es2_cport_clear, 741 .latency_tag_enable = latency_tag_enable, 742 .latency_tag_disable = latency_tag_disable, 743 .output = output, 744 }; 745 746 /* Common function to report consistent warnings based on URB status */ 747 static int check_urb_status(struct urb *urb) 748 { 749 struct device *dev = &urb->dev->dev; 750 int status = urb->status; 751 752 switch (status) { 753 case 0: 754 return 0; 755 756 case -EOVERFLOW: 757 dev_err(dev, "%s: overflow actual length is %d\n", 758 __func__, urb->actual_length); 759 fallthrough; 760 case -ECONNRESET: 761 case -ENOENT: 762 case -ESHUTDOWN: 763 case -EILSEQ: 764 case -EPROTO: 765 /* device is gone, stop sending */ 766 return status; 767 } 768 dev_err(dev, "%s: unknown status %d\n", __func__, status); 769 770 return -EAGAIN; 771 } 772 773 static void es2_destroy(struct es2_ap_dev *es2) 774 { 775 struct usb_device *udev; 776 struct urb *urb; 777 int i; 778 779 debugfs_remove(es2->apb_log_enable_dentry); 780 usb_log_disable(es2); 781 782 /* Tear down everything! */ 783 for (i = 0; i < NUM_CPORT_OUT_URB; ++i) { 784 urb = es2->cport_out_urb[i]; 785 usb_kill_urb(urb); 786 usb_free_urb(urb); 787 es2->cport_out_urb[i] = NULL; 788 es2->cport_out_urb_busy[i] = false; /* just to be anal */ 789 } 790 791 for (i = 0; i < NUM_ARPC_IN_URB; ++i) { 792 usb_free_urb(es2->arpc_urb[i]); 793 kfree(es2->arpc_buffer[i]); 794 es2->arpc_buffer[i] = NULL; 795 } 796 797 for (i = 0; i < NUM_CPORT_IN_URB; ++i) { 798 usb_free_urb(es2->cport_in.urb[i]); 799 kfree(es2->cport_in.buffer[i]); 800 es2->cport_in.buffer[i] = NULL; 801 } 802 803 /* release reserved CDSI0 and CDSI1 cports */ 804 gb_hd_cport_release_reserved(es2->hd, ES2_CPORT_CDSI1); 805 gb_hd_cport_release_reserved(es2->hd, ES2_CPORT_CDSI0); 806 807 udev = es2->usb_dev; 808 gb_hd_put(es2->hd); 809 810 usb_put_dev(udev); 811 } 812 813 static void cport_in_callback(struct urb *urb) 814 { 815 struct gb_host_device *hd = urb->context; 816 struct device *dev = &urb->dev->dev; 817 struct gb_operation_msg_hdr *header; 818 int status = check_urb_status(urb); 819 int retval; 820 u16 cport_id; 821 822 if (status) { 823 if ((status == -EAGAIN) || (status == -EPROTO)) 824 goto exit; 825 826 /* The urb is being unlinked */ 827 if (status == -ENOENT || status == -ESHUTDOWN) 828 return; 829 830 dev_err(dev, "urb cport in error %d (dropped)\n", status); 831 return; 832 } 833 834 if (urb->actual_length < sizeof(*header)) { 835 dev_err(dev, "short message received\n"); 836 goto exit; 837 } 838 839 /* Extract the CPort id, which is packed in the message header */ 840 header = urb->transfer_buffer; 841 cport_id = gb_message_cport_unpack(header); 842 843 if (cport_id_valid(hd, cport_id)) { 844 greybus_data_rcvd(hd, cport_id, urb->transfer_buffer, 845 urb->actual_length); 846 } else { 847 dev_err(dev, "invalid cport id %u received\n", cport_id); 848 } 849 exit: 850 /* put our urb back in the request pool */ 851 retval = usb_submit_urb(urb, GFP_ATOMIC); 852 if (retval) 853 dev_err(dev, "failed to resubmit in-urb: %d\n", retval); 854 } 855 856 static void cport_out_callback(struct urb *urb) 857 { 858 struct gb_message *message = urb->context; 859 struct gb_host_device *hd = message->operation->connection->hd; 860 struct es2_ap_dev *es2 = hd_to_es2(hd); 861 int status = check_urb_status(urb); 862 unsigned long flags; 863 864 gb_message_cport_clear(message->header); 865 866 spin_lock_irqsave(&es2->cport_out_urb_lock, flags); 867 message->hcpriv = NULL; 868 spin_unlock_irqrestore(&es2->cport_out_urb_lock, flags); 869 870 /* 871 * Tell the submitter that the message send (attempt) is 872 * complete, and report the status. 873 */ 874 greybus_message_sent(hd, message, status); 875 876 free_urb(es2, urb); 877 } 878 879 static struct arpc *arpc_alloc(void *payload, u16 size, u8 type) 880 { 881 struct arpc *rpc; 882 883 if (size + sizeof(*rpc->req) > ARPC_OUT_SIZE_MAX) 884 return NULL; 885 886 rpc = kzalloc(sizeof(*rpc), GFP_KERNEL); 887 if (!rpc) 888 return NULL; 889 890 INIT_LIST_HEAD(&rpc->list); 891 rpc->req = kzalloc(sizeof(*rpc->req) + size, GFP_KERNEL); 892 if (!rpc->req) 893 goto err_free_rpc; 894 895 rpc->resp = kzalloc(sizeof(*rpc->resp), GFP_KERNEL); 896 if (!rpc->resp) 897 goto err_free_req; 898 899 rpc->req->type = type; 900 rpc->req->size = cpu_to_le16(sizeof(*rpc->req) + size); 901 memcpy(rpc->req->data, payload, size); 902 903 init_completion(&rpc->response_received); 904 905 return rpc; 906 907 err_free_req: 908 kfree(rpc->req); 909 err_free_rpc: 910 kfree(rpc); 911 912 return NULL; 913 } 914 915 static void arpc_free(struct arpc *rpc) 916 { 917 kfree(rpc->req); 918 kfree(rpc->resp); 919 kfree(rpc); 920 } 921 922 static struct arpc *arpc_find(struct es2_ap_dev *es2, __le16 id) 923 { 924 struct arpc *rpc; 925 926 list_for_each_entry(rpc, &es2->arpcs, list) { 927 if (rpc->req->id == id) 928 return rpc; 929 } 930 931 return NULL; 932 } 933 934 static void arpc_add(struct es2_ap_dev *es2, struct arpc *rpc) 935 { 936 rpc->active = true; 937 rpc->req->id = cpu_to_le16(es2->arpc_id_cycle++); 938 list_add_tail(&rpc->list, &es2->arpcs); 939 } 940 941 static void arpc_del(struct es2_ap_dev *es2, struct arpc *rpc) 942 { 943 if (rpc->active) { 944 rpc->active = false; 945 list_del(&rpc->list); 946 } 947 } 948 949 static int arpc_send(struct es2_ap_dev *es2, struct arpc *rpc, int timeout) 950 { 951 struct usb_device *udev = es2->usb_dev; 952 int retval; 953 954 retval = usb_control_msg(udev, usb_sndctrlpipe(udev, 0), 955 GB_APB_REQUEST_ARPC_RUN, 956 USB_DIR_OUT | USB_TYPE_VENDOR | 957 USB_RECIP_INTERFACE, 958 0, 0, 959 rpc->req, le16_to_cpu(rpc->req->size), 960 ES2_USB_CTRL_TIMEOUT); 961 if (retval < 0) { 962 dev_err(&udev->dev, 963 "failed to send ARPC request %d: %d\n", 964 rpc->req->type, retval); 965 return retval; 966 } 967 968 return 0; 969 } 970 971 static int arpc_sync(struct es2_ap_dev *es2, u8 type, void *payload, 972 size_t size, int *result, unsigned int timeout) 973 { 974 struct arpc *rpc; 975 unsigned long flags; 976 int retval; 977 978 if (result) 979 *result = 0; 980 981 rpc = arpc_alloc(payload, size, type); 982 if (!rpc) 983 return -ENOMEM; 984 985 spin_lock_irqsave(&es2->arpc_lock, flags); 986 arpc_add(es2, rpc); 987 spin_unlock_irqrestore(&es2->arpc_lock, flags); 988 989 retval = arpc_send(es2, rpc, timeout); 990 if (retval) 991 goto out_arpc_del; 992 993 retval = wait_for_completion_interruptible_timeout( 994 &rpc->response_received, 995 msecs_to_jiffies(timeout)); 996 if (retval <= 0) { 997 if (!retval) 998 retval = -ETIMEDOUT; 999 goto out_arpc_del; 1000 } 1001 1002 if (rpc->resp->result) { 1003 retval = -EREMOTEIO; 1004 if (result) 1005 *result = rpc->resp->result; 1006 } else { 1007 retval = 0; 1008 } 1009 1010 out_arpc_del: 1011 spin_lock_irqsave(&es2->arpc_lock, flags); 1012 arpc_del(es2, rpc); 1013 spin_unlock_irqrestore(&es2->arpc_lock, flags); 1014 arpc_free(rpc); 1015 1016 if (retval < 0 && retval != -EREMOTEIO) { 1017 dev_err(&es2->usb_dev->dev, 1018 "failed to execute ARPC: %d\n", retval); 1019 } 1020 1021 return retval; 1022 } 1023 1024 static void arpc_in_callback(struct urb *urb) 1025 { 1026 struct es2_ap_dev *es2 = urb->context; 1027 struct device *dev = &urb->dev->dev; 1028 int status = check_urb_status(urb); 1029 struct arpc *rpc; 1030 struct arpc_response_message *resp; 1031 unsigned long flags; 1032 int retval; 1033 1034 if (status) { 1035 if ((status == -EAGAIN) || (status == -EPROTO)) 1036 goto exit; 1037 1038 /* The urb is being unlinked */ 1039 if (status == -ENOENT || status == -ESHUTDOWN) 1040 return; 1041 1042 dev_err(dev, "arpc in-urb error %d (dropped)\n", status); 1043 return; 1044 } 1045 1046 if (urb->actual_length < sizeof(*resp)) { 1047 dev_err(dev, "short aprc response received\n"); 1048 goto exit; 1049 } 1050 1051 resp = urb->transfer_buffer; 1052 spin_lock_irqsave(&es2->arpc_lock, flags); 1053 rpc = arpc_find(es2, resp->id); 1054 if (!rpc) { 1055 dev_err(dev, "invalid arpc response id received: %u\n", 1056 le16_to_cpu(resp->id)); 1057 spin_unlock_irqrestore(&es2->arpc_lock, flags); 1058 goto exit; 1059 } 1060 1061 arpc_del(es2, rpc); 1062 memcpy(rpc->resp, resp, sizeof(*resp)); 1063 complete(&rpc->response_received); 1064 spin_unlock_irqrestore(&es2->arpc_lock, flags); 1065 1066 exit: 1067 /* put our urb back in the request pool */ 1068 retval = usb_submit_urb(urb, GFP_ATOMIC); 1069 if (retval) 1070 dev_err(dev, "failed to resubmit arpc in-urb: %d\n", retval); 1071 } 1072 1073 #define APB1_LOG_MSG_SIZE 64 1074 static void apb_log_get(struct es2_ap_dev *es2, char *buf) 1075 { 1076 int retval; 1077 1078 do { 1079 retval = usb_control_msg(es2->usb_dev, 1080 usb_rcvctrlpipe(es2->usb_dev, 0), 1081 GB_APB_REQUEST_LOG, 1082 USB_DIR_IN | USB_TYPE_VENDOR | 1083 USB_RECIP_INTERFACE, 1084 0x00, 0x00, 1085 buf, 1086 APB1_LOG_MSG_SIZE, 1087 ES2_USB_CTRL_TIMEOUT); 1088 if (retval > 0) 1089 kfifo_in(&es2->apb_log_fifo, buf, retval); 1090 } while (retval > 0); 1091 } 1092 1093 static int apb_log_poll(void *data) 1094 { 1095 struct es2_ap_dev *es2 = data; 1096 char *buf; 1097 1098 buf = kmalloc(APB1_LOG_MSG_SIZE, GFP_KERNEL); 1099 if (!buf) 1100 return -ENOMEM; 1101 1102 while (!kthread_should_stop()) { 1103 msleep(1000); 1104 apb_log_get(es2, buf); 1105 } 1106 1107 kfree(buf); 1108 1109 return 0; 1110 } 1111 1112 static ssize_t apb_log_read(struct file *f, char __user *buf, 1113 size_t count, loff_t *ppos) 1114 { 1115 struct es2_ap_dev *es2 = file_inode(f)->i_private; 1116 ssize_t ret; 1117 size_t copied; 1118 char *tmp_buf; 1119 1120 if (count > APB1_LOG_SIZE) 1121 count = APB1_LOG_SIZE; 1122 1123 tmp_buf = kmalloc(count, GFP_KERNEL); 1124 if (!tmp_buf) 1125 return -ENOMEM; 1126 1127 copied = kfifo_out(&es2->apb_log_fifo, tmp_buf, count); 1128 ret = simple_read_from_buffer(buf, count, ppos, tmp_buf, copied); 1129 1130 kfree(tmp_buf); 1131 1132 return ret; 1133 } 1134 1135 static const struct file_operations apb_log_fops = { 1136 .read = apb_log_read, 1137 }; 1138 1139 static void usb_log_enable(struct es2_ap_dev *es2) 1140 { 1141 if (!IS_ERR_OR_NULL(es2->apb_log_task)) 1142 return; 1143 1144 /* get log from APB1 */ 1145 es2->apb_log_task = kthread_run(apb_log_poll, es2, "apb_log"); 1146 if (IS_ERR(es2->apb_log_task)) 1147 return; 1148 /* XXX We will need to rename this per APB */ 1149 es2->apb_log_dentry = debugfs_create_file("apb_log", 0444, 1150 gb_debugfs_get(), es2, 1151 &apb_log_fops); 1152 } 1153 1154 static void usb_log_disable(struct es2_ap_dev *es2) 1155 { 1156 if (IS_ERR_OR_NULL(es2->apb_log_task)) 1157 return; 1158 1159 debugfs_remove(es2->apb_log_dentry); 1160 es2->apb_log_dentry = NULL; 1161 1162 kthread_stop(es2->apb_log_task); 1163 es2->apb_log_task = NULL; 1164 } 1165 1166 static ssize_t apb_log_enable_read(struct file *f, char __user *buf, 1167 size_t count, loff_t *ppos) 1168 { 1169 struct es2_ap_dev *es2 = file_inode(f)->i_private; 1170 int enable = !IS_ERR_OR_NULL(es2->apb_log_task); 1171 char tmp_buf[3]; 1172 1173 sprintf(tmp_buf, "%d\n", enable); 1174 return simple_read_from_buffer(buf, count, ppos, tmp_buf, 2); 1175 } 1176 1177 static ssize_t apb_log_enable_write(struct file *f, const char __user *buf, 1178 size_t count, loff_t *ppos) 1179 { 1180 int enable; 1181 ssize_t retval; 1182 struct es2_ap_dev *es2 = file_inode(f)->i_private; 1183 1184 retval = kstrtoint_from_user(buf, count, 10, &enable); 1185 if (retval) 1186 return retval; 1187 1188 if (enable) 1189 usb_log_enable(es2); 1190 else 1191 usb_log_disable(es2); 1192 1193 return count; 1194 } 1195 1196 static const struct file_operations apb_log_enable_fops = { 1197 .read = apb_log_enable_read, 1198 .write = apb_log_enable_write, 1199 }; 1200 1201 static int apb_get_cport_count(struct usb_device *udev) 1202 { 1203 int retval; 1204 __le16 *cport_count; 1205 1206 cport_count = kzalloc(sizeof(*cport_count), GFP_KERNEL); 1207 if (!cport_count) 1208 return -ENOMEM; 1209 1210 retval = usb_control_msg(udev, usb_rcvctrlpipe(udev, 0), 1211 GB_APB_REQUEST_CPORT_COUNT, 1212 USB_DIR_IN | USB_TYPE_VENDOR | 1213 USB_RECIP_INTERFACE, 0, 0, cport_count, 1214 sizeof(*cport_count), ES2_USB_CTRL_TIMEOUT); 1215 if (retval != sizeof(*cport_count)) { 1216 dev_err(&udev->dev, "Cannot retrieve CPort count: %d\n", 1217 retval); 1218 1219 if (retval >= 0) 1220 retval = -EIO; 1221 1222 goto out; 1223 } 1224 1225 retval = le16_to_cpu(*cport_count); 1226 1227 /* We need to fit a CPort ID in one byte of a message header */ 1228 if (retval > U8_MAX) { 1229 retval = U8_MAX; 1230 dev_warn(&udev->dev, "Limiting number of CPorts to U8_MAX\n"); 1231 } 1232 1233 out: 1234 kfree(cport_count); 1235 return retval; 1236 } 1237 1238 /* 1239 * The ES2 USB Bridge device has 15 endpoints 1240 * 1 Control - usual USB stuff + AP -> APBridgeA messages 1241 * 7 Bulk IN - CPort data in 1242 * 7 Bulk OUT - CPort data out 1243 */ 1244 static int ap_probe(struct usb_interface *interface, 1245 const struct usb_device_id *id) 1246 { 1247 struct es2_ap_dev *es2; 1248 struct gb_host_device *hd; 1249 struct usb_device *udev; 1250 struct usb_host_interface *iface_desc; 1251 struct usb_endpoint_descriptor *endpoint; 1252 __u8 ep_addr; 1253 int retval; 1254 int i; 1255 int num_cports; 1256 bool bulk_out_found = false; 1257 bool bulk_in_found = false; 1258 bool arpc_in_found = false; 1259 1260 udev = usb_get_dev(interface_to_usbdev(interface)); 1261 1262 num_cports = apb_get_cport_count(udev); 1263 if (num_cports < 0) { 1264 usb_put_dev(udev); 1265 dev_err(&udev->dev, "Cannot retrieve CPort count: %d\n", 1266 num_cports); 1267 return num_cports; 1268 } 1269 1270 hd = gb_hd_create(&es2_driver, &udev->dev, ES2_GBUF_MSG_SIZE_MAX, 1271 num_cports); 1272 if (IS_ERR(hd)) { 1273 usb_put_dev(udev); 1274 return PTR_ERR(hd); 1275 } 1276 1277 es2 = hd_to_es2(hd); 1278 es2->hd = hd; 1279 es2->usb_intf = interface; 1280 es2->usb_dev = udev; 1281 spin_lock_init(&es2->cport_out_urb_lock); 1282 INIT_KFIFO(es2->apb_log_fifo); 1283 usb_set_intfdata(interface, es2); 1284 1285 /* 1286 * Reserve the CDSI0 and CDSI1 CPorts so they won't be allocated 1287 * dynamically. 1288 */ 1289 retval = gb_hd_cport_reserve(hd, ES2_CPORT_CDSI0); 1290 if (retval) 1291 goto error; 1292 retval = gb_hd_cport_reserve(hd, ES2_CPORT_CDSI1); 1293 if (retval) 1294 goto error; 1295 1296 /* find all bulk endpoints */ 1297 iface_desc = interface->cur_altsetting; 1298 for (i = 0; i < iface_desc->desc.bNumEndpoints; ++i) { 1299 endpoint = &iface_desc->endpoint[i].desc; 1300 ep_addr = endpoint->bEndpointAddress; 1301 1302 if (usb_endpoint_is_bulk_in(endpoint)) { 1303 if (!bulk_in_found) { 1304 es2->cport_in.endpoint = ep_addr; 1305 bulk_in_found = true; 1306 } else if (!arpc_in_found) { 1307 es2->arpc_endpoint_in = ep_addr; 1308 arpc_in_found = true; 1309 } else { 1310 dev_warn(&udev->dev, 1311 "Unused bulk IN endpoint found: 0x%02x\n", 1312 ep_addr); 1313 } 1314 continue; 1315 } 1316 if (usb_endpoint_is_bulk_out(endpoint)) { 1317 if (!bulk_out_found) { 1318 es2->cport_out_endpoint = ep_addr; 1319 bulk_out_found = true; 1320 } else { 1321 dev_warn(&udev->dev, 1322 "Unused bulk OUT endpoint found: 0x%02x\n", 1323 ep_addr); 1324 } 1325 continue; 1326 } 1327 dev_warn(&udev->dev, 1328 "Unknown endpoint type found, address 0x%02x\n", 1329 ep_addr); 1330 } 1331 if (!bulk_in_found || !arpc_in_found || !bulk_out_found) { 1332 dev_err(&udev->dev, "Not enough endpoints found in device, aborting!\n"); 1333 retval = -ENODEV; 1334 goto error; 1335 } 1336 1337 /* Allocate buffers for our cport in messages */ 1338 for (i = 0; i < NUM_CPORT_IN_URB; ++i) { 1339 struct urb *urb; 1340 u8 *buffer; 1341 1342 urb = usb_alloc_urb(0, GFP_KERNEL); 1343 if (!urb) { 1344 retval = -ENOMEM; 1345 goto error; 1346 } 1347 es2->cport_in.urb[i] = urb; 1348 1349 buffer = kmalloc(ES2_GBUF_MSG_SIZE_MAX, GFP_KERNEL); 1350 if (!buffer) { 1351 retval = -ENOMEM; 1352 goto error; 1353 } 1354 1355 usb_fill_bulk_urb(urb, udev, 1356 usb_rcvbulkpipe(udev, es2->cport_in.endpoint), 1357 buffer, ES2_GBUF_MSG_SIZE_MAX, 1358 cport_in_callback, hd); 1359 1360 es2->cport_in.buffer[i] = buffer; 1361 } 1362 1363 /* Allocate buffers for ARPC in messages */ 1364 for (i = 0; i < NUM_ARPC_IN_URB; ++i) { 1365 struct urb *urb; 1366 u8 *buffer; 1367 1368 urb = usb_alloc_urb(0, GFP_KERNEL); 1369 if (!urb) { 1370 retval = -ENOMEM; 1371 goto error; 1372 } 1373 es2->arpc_urb[i] = urb; 1374 1375 buffer = kmalloc(ARPC_IN_SIZE_MAX, GFP_KERNEL); 1376 if (!buffer) { 1377 retval = -ENOMEM; 1378 goto error; 1379 } 1380 1381 usb_fill_bulk_urb(urb, udev, 1382 usb_rcvbulkpipe(udev, 1383 es2->arpc_endpoint_in), 1384 buffer, ARPC_IN_SIZE_MAX, 1385 arpc_in_callback, es2); 1386 1387 es2->arpc_buffer[i] = buffer; 1388 } 1389 1390 /* Allocate urbs for our CPort OUT messages */ 1391 for (i = 0; i < NUM_CPORT_OUT_URB; ++i) { 1392 struct urb *urb; 1393 1394 urb = usb_alloc_urb(0, GFP_KERNEL); 1395 if (!urb) { 1396 retval = -ENOMEM; 1397 goto error; 1398 } 1399 1400 es2->cport_out_urb[i] = urb; 1401 es2->cport_out_urb_busy[i] = false; /* just to be anal */ 1402 } 1403 1404 /* XXX We will need to rename this per APB */ 1405 es2->apb_log_enable_dentry = debugfs_create_file("apb_log_enable", 1406 0644, 1407 gb_debugfs_get(), es2, 1408 &apb_log_enable_fops); 1409 1410 INIT_LIST_HEAD(&es2->arpcs); 1411 spin_lock_init(&es2->arpc_lock); 1412 1413 retval = es2_arpc_in_enable(es2); 1414 if (retval) 1415 goto error; 1416 1417 retval = gb_hd_add(hd); 1418 if (retval) 1419 goto err_disable_arpc_in; 1420 1421 retval = es2_cport_in_enable(es2, &es2->cport_in); 1422 if (retval) 1423 goto err_hd_del; 1424 1425 return 0; 1426 1427 err_hd_del: 1428 gb_hd_del(hd); 1429 err_disable_arpc_in: 1430 es2_arpc_in_disable(es2); 1431 error: 1432 es2_destroy(es2); 1433 1434 return retval; 1435 } 1436 1437 static void ap_disconnect(struct usb_interface *interface) 1438 { 1439 struct es2_ap_dev *es2 = usb_get_intfdata(interface); 1440 1441 gb_hd_del(es2->hd); 1442 1443 es2_cport_in_disable(es2, &es2->cport_in); 1444 es2_arpc_in_disable(es2); 1445 1446 es2_destroy(es2); 1447 } 1448 1449 static struct usb_driver es2_ap_driver = { 1450 .name = "es2_ap_driver", 1451 .probe = ap_probe, 1452 .disconnect = ap_disconnect, 1453 .id_table = id_table, 1454 .soft_unbind = 1, 1455 }; 1456 1457 module_usb_driver(es2_ap_driver); 1458 1459 MODULE_LICENSE("GPL v2"); 1460 MODULE_AUTHOR("Greg Kroah-Hartman <gregkh@linuxfoundation.org>"); 1461