1 // SPDX-License-Identifier: GPL-2.0-or-later 2 /* 3 Copyright (C) 2010 Willow Garage <http://www.willowgarage.com> 4 Copyright (C) 2004 - 2010 Ivo van Doorn <IvDoorn@gmail.com> 5 <http://rt2x00.serialmonkey.com> 6 7 */ 8 9 /* 10 Module: rt2x00usb 11 Abstract: rt2x00 generic usb device routines. 12 */ 13 14 #include <linux/kernel.h> 15 #include <linux/module.h> 16 #include <linux/slab.h> 17 #include <linux/usb.h> 18 #include <linux/bug.h> 19 20 #include "rt2x00.h" 21 #include "rt2x00usb.h" 22 23 static bool rt2x00usb_check_usb_error(struct rt2x00_dev *rt2x00dev, int status) 24 { 25 if (status == -ENODEV || status == -ENOENT) 26 return true; 27 28 if (!test_bit(DEVICE_STATE_STARTED, &rt2x00dev->flags)) 29 return false; 30 31 if (status == -EPROTO || status == -ETIMEDOUT) 32 rt2x00dev->num_proto_errs++; 33 else 34 rt2x00dev->num_proto_errs = 0; 35 36 if (rt2x00dev->num_proto_errs > 3) 37 return true; 38 39 return false; 40 } 41 42 /* 43 * Interfacing with the HW. 44 */ 45 int rt2x00usb_vendor_request(struct rt2x00_dev *rt2x00dev, 46 const u8 request, const u8 requesttype, 47 const u16 offset, const u16 value, 48 void *buffer, const u16 buffer_length, 49 const int timeout) 50 { 51 struct usb_device *usb_dev = to_usb_device_intf(rt2x00dev->dev); 52 int status; 53 unsigned int pipe = 54 (requesttype == USB_VENDOR_REQUEST_IN) ? 55 usb_rcvctrlpipe(usb_dev, 0) : usb_sndctrlpipe(usb_dev, 0); 56 unsigned long expire = jiffies + msecs_to_jiffies(timeout); 57 58 if (!test_bit(DEVICE_STATE_PRESENT, &rt2x00dev->flags)) 59 return -ENODEV; 60 61 do { 62 status = usb_control_msg(usb_dev, pipe, request, requesttype, 63 value, offset, buffer, buffer_length, 64 timeout / 2); 65 if (status >= 0) 66 return 0; 67 68 if (rt2x00usb_check_usb_error(rt2x00dev, status)) { 69 /* Device has disappeared. */ 70 clear_bit(DEVICE_STATE_PRESENT, &rt2x00dev->flags); 71 break; 72 } 73 } while (time_before(jiffies, expire)); 74 75 rt2x00_err(rt2x00dev, 76 "Vendor Request 0x%02x failed for offset 0x%04x with error %d\n", 77 request, offset, status); 78 79 return status; 80 } 81 EXPORT_SYMBOL_GPL(rt2x00usb_vendor_request); 82 83 int rt2x00usb_vendor_req_buff_lock(struct rt2x00_dev *rt2x00dev, 84 const u8 request, const u8 requesttype, 85 const u16 offset, void *buffer, 86 const u16 buffer_length, const int timeout) 87 { 88 int status; 89 90 BUG_ON(!mutex_is_locked(&rt2x00dev->csr_mutex)); 91 92 /* 93 * Check for Cache availability. 94 */ 95 if (unlikely(!rt2x00dev->csr.cache || buffer_length > CSR_CACHE_SIZE)) { 96 rt2x00_err(rt2x00dev, "CSR cache not available\n"); 97 return -ENOMEM; 98 } 99 100 if (requesttype == USB_VENDOR_REQUEST_OUT) 101 memcpy(rt2x00dev->csr.cache, buffer, buffer_length); 102 103 status = rt2x00usb_vendor_request(rt2x00dev, request, requesttype, 104 offset, 0, rt2x00dev->csr.cache, 105 buffer_length, timeout); 106 107 if (!status && requesttype == USB_VENDOR_REQUEST_IN) 108 memcpy(buffer, rt2x00dev->csr.cache, buffer_length); 109 110 return status; 111 } 112 EXPORT_SYMBOL_GPL(rt2x00usb_vendor_req_buff_lock); 113 114 int rt2x00usb_vendor_request_buff(struct rt2x00_dev *rt2x00dev, 115 const u8 request, const u8 requesttype, 116 const u16 offset, void *buffer, 117 const u16 buffer_length) 118 { 119 int status = 0; 120 u8 *tb; 121 u16 off, len, bsize; 122 123 mutex_lock(&rt2x00dev->csr_mutex); 124 125 tb = (u8 *)buffer; 126 off = offset; 127 len = buffer_length; 128 while (len && !status) { 129 bsize = min_t(u16, CSR_CACHE_SIZE, len); 130 status = rt2x00usb_vendor_req_buff_lock(rt2x00dev, request, 131 requesttype, off, tb, 132 bsize, REGISTER_TIMEOUT); 133 134 tb += bsize; 135 len -= bsize; 136 off += bsize; 137 } 138 139 mutex_unlock(&rt2x00dev->csr_mutex); 140 141 return status; 142 } 143 EXPORT_SYMBOL_GPL(rt2x00usb_vendor_request_buff); 144 145 int rt2x00usb_regbusy_read(struct rt2x00_dev *rt2x00dev, 146 const unsigned int offset, 147 const struct rt2x00_field32 field, 148 u32 *reg) 149 { 150 unsigned int i; 151 152 if (!test_bit(DEVICE_STATE_PRESENT, &rt2x00dev->flags)) 153 return -ENODEV; 154 155 for (i = 0; i < REGISTER_USB_BUSY_COUNT; i++) { 156 *reg = rt2x00usb_register_read_lock(rt2x00dev, offset); 157 if (!rt2x00_get_field32(*reg, field)) 158 return 1; 159 udelay(REGISTER_BUSY_DELAY); 160 } 161 162 rt2x00_err(rt2x00dev, "Indirect register access failed: offset=0x%.08x, value=0x%.08x\n", 163 offset, *reg); 164 *reg = ~0; 165 166 return 0; 167 } 168 EXPORT_SYMBOL_GPL(rt2x00usb_regbusy_read); 169 170 171 struct rt2x00_async_read_data { 172 __le32 reg; 173 struct usb_ctrlrequest cr; 174 struct rt2x00_dev *rt2x00dev; 175 bool (*callback)(struct rt2x00_dev *, int, u32); 176 }; 177 178 static void rt2x00usb_register_read_async_cb(struct urb *urb) 179 { 180 struct rt2x00_async_read_data *rd = urb->context; 181 if (rd->callback(rd->rt2x00dev, urb->status, le32_to_cpu(rd->reg))) { 182 usb_anchor_urb(urb, rd->rt2x00dev->anchor); 183 if (usb_submit_urb(urb, GFP_ATOMIC) < 0) { 184 usb_unanchor_urb(urb); 185 kfree(rd); 186 } 187 } else 188 kfree(rd); 189 } 190 191 void rt2x00usb_register_read_async(struct rt2x00_dev *rt2x00dev, 192 const unsigned int offset, 193 bool (*callback)(struct rt2x00_dev*, int, u32)) 194 { 195 struct usb_device *usb_dev = to_usb_device_intf(rt2x00dev->dev); 196 struct urb *urb; 197 struct rt2x00_async_read_data *rd; 198 199 rd = kmalloc(sizeof(*rd), GFP_ATOMIC); 200 if (!rd) 201 return; 202 203 urb = usb_alloc_urb(0, GFP_ATOMIC); 204 if (!urb) { 205 kfree(rd); 206 return; 207 } 208 209 rd->rt2x00dev = rt2x00dev; 210 rd->callback = callback; 211 rd->cr.bRequestType = USB_VENDOR_REQUEST_IN; 212 rd->cr.bRequest = USB_MULTI_READ; 213 rd->cr.wValue = 0; 214 rd->cr.wIndex = cpu_to_le16(offset); 215 rd->cr.wLength = cpu_to_le16(sizeof(u32)); 216 217 usb_fill_control_urb(urb, usb_dev, usb_rcvctrlpipe(usb_dev, 0), 218 (u8 *)(&rd->cr), &rd->reg, sizeof(rd->reg), 219 rt2x00usb_register_read_async_cb, rd); 220 usb_anchor_urb(urb, rt2x00dev->anchor); 221 if (usb_submit_urb(urb, GFP_ATOMIC) < 0) { 222 usb_unanchor_urb(urb); 223 kfree(rd); 224 } 225 usb_free_urb(urb); 226 } 227 EXPORT_SYMBOL_GPL(rt2x00usb_register_read_async); 228 229 /* 230 * TX data handlers. 231 */ 232 static void rt2x00usb_work_txdone_entry(struct queue_entry *entry) 233 { 234 /* 235 * If the transfer to hardware succeeded, it does not mean the 236 * frame was send out correctly. It only means the frame 237 * was successfully pushed to the hardware, we have no 238 * way to determine the transmission status right now. 239 * (Only indirectly by looking at the failed TX counters 240 * in the register). 241 */ 242 if (test_bit(ENTRY_DATA_IO_FAILED, &entry->flags)) 243 rt2x00lib_txdone_noinfo(entry, TXDONE_FAILURE); 244 else 245 rt2x00lib_txdone_noinfo(entry, TXDONE_UNKNOWN); 246 } 247 248 static void rt2x00usb_work_txdone(struct work_struct *work) 249 { 250 struct rt2x00_dev *rt2x00dev = 251 container_of(work, struct rt2x00_dev, txdone_work); 252 struct data_queue *queue; 253 struct queue_entry *entry; 254 255 tx_queue_for_each(rt2x00dev, queue) { 256 while (!rt2x00queue_empty(queue)) { 257 entry = rt2x00queue_get_entry(queue, Q_INDEX_DONE); 258 259 if (test_bit(ENTRY_OWNER_DEVICE_DATA, &entry->flags) || 260 !test_bit(ENTRY_DATA_STATUS_PENDING, &entry->flags)) 261 break; 262 263 rt2x00usb_work_txdone_entry(entry); 264 } 265 } 266 } 267 268 static void rt2x00usb_interrupt_txdone(struct urb *urb) 269 { 270 struct queue_entry *entry = (struct queue_entry *)urb->context; 271 struct rt2x00_dev *rt2x00dev = entry->queue->rt2x00dev; 272 273 if (!test_bit(ENTRY_OWNER_DEVICE_DATA, &entry->flags)) 274 return; 275 /* 276 * Check if the frame was correctly uploaded 277 */ 278 if (urb->status) 279 set_bit(ENTRY_DATA_IO_FAILED, &entry->flags); 280 /* 281 * Report the frame as DMA done 282 */ 283 rt2x00lib_dmadone(entry); 284 285 if (rt2x00dev->ops->lib->tx_dma_done) 286 rt2x00dev->ops->lib->tx_dma_done(entry); 287 /* 288 * Schedule the delayed work for reading the TX status 289 * from the device. 290 */ 291 if (!rt2x00_has_cap_flag(rt2x00dev, REQUIRE_TXSTATUS_FIFO) || 292 !kfifo_is_empty(&rt2x00dev->txstatus_fifo)) 293 queue_work(rt2x00dev->workqueue, &rt2x00dev->txdone_work); 294 } 295 296 static bool rt2x00usb_kick_tx_entry(struct queue_entry *entry, void *data) 297 { 298 struct rt2x00_dev *rt2x00dev = entry->queue->rt2x00dev; 299 struct usb_device *usb_dev = to_usb_device_intf(rt2x00dev->dev); 300 struct queue_entry_priv_usb *entry_priv = entry->priv_data; 301 u32 length; 302 int status; 303 304 if (!test_and_clear_bit(ENTRY_DATA_PENDING, &entry->flags) || 305 test_bit(ENTRY_DATA_STATUS_PENDING, &entry->flags)) 306 return false; 307 308 /* 309 * USB devices require certain padding at the end of each frame 310 * and urb. Those paddings are not included in skbs. Pass entry 311 * to the driver to determine what the overall length should be. 312 */ 313 length = rt2x00dev->ops->lib->get_tx_data_len(entry); 314 315 status = skb_padto(entry->skb, length); 316 if (unlikely(status)) { 317 /* TODO: report something more appropriate than IO_FAILED. */ 318 rt2x00_warn(rt2x00dev, "TX SKB padding error, out of memory\n"); 319 set_bit(ENTRY_DATA_IO_FAILED, &entry->flags); 320 rt2x00lib_dmadone(entry); 321 322 return false; 323 } 324 325 usb_fill_bulk_urb(entry_priv->urb, usb_dev, 326 usb_sndbulkpipe(usb_dev, entry->queue->usb_endpoint), 327 entry->skb->data, length, 328 rt2x00usb_interrupt_txdone, entry); 329 330 status = usb_submit_urb(entry_priv->urb, GFP_ATOMIC); 331 if (status) { 332 if (rt2x00usb_check_usb_error(rt2x00dev, status)) 333 clear_bit(DEVICE_STATE_PRESENT, &rt2x00dev->flags); 334 set_bit(ENTRY_DATA_IO_FAILED, &entry->flags); 335 rt2x00lib_dmadone(entry); 336 } 337 338 return false; 339 } 340 341 /* 342 * RX data handlers. 343 */ 344 static void rt2x00usb_work_rxdone(struct work_struct *work) 345 { 346 struct rt2x00_dev *rt2x00dev = 347 container_of(work, struct rt2x00_dev, rxdone_work); 348 struct queue_entry *entry; 349 struct skb_frame_desc *skbdesc; 350 u8 rxd[32]; 351 352 while (!rt2x00queue_empty(rt2x00dev->rx)) { 353 entry = rt2x00queue_get_entry(rt2x00dev->rx, Q_INDEX_DONE); 354 355 if (test_bit(ENTRY_OWNER_DEVICE_DATA, &entry->flags)) 356 break; 357 358 /* 359 * Fill in desc fields of the skb descriptor 360 */ 361 skbdesc = get_skb_frame_desc(entry->skb); 362 skbdesc->desc = rxd; 363 skbdesc->desc_len = entry->queue->desc_size; 364 365 /* 366 * Send the frame to rt2x00lib for further processing. 367 */ 368 rt2x00lib_rxdone(entry, GFP_KERNEL); 369 } 370 } 371 372 static void rt2x00usb_interrupt_rxdone(struct urb *urb) 373 { 374 struct queue_entry *entry = (struct queue_entry *)urb->context; 375 struct rt2x00_dev *rt2x00dev = entry->queue->rt2x00dev; 376 377 if (!test_bit(ENTRY_OWNER_DEVICE_DATA, &entry->flags)) 378 return; 379 380 /* 381 * Check if the received data is simply too small 382 * to be actually valid, or if the urb is signaling 383 * a problem. 384 */ 385 if (urb->actual_length < entry->queue->desc_size || urb->status) 386 set_bit(ENTRY_DATA_IO_FAILED, &entry->flags); 387 388 /* 389 * Report the frame as DMA done 390 */ 391 rt2x00lib_dmadone(entry); 392 393 /* 394 * Schedule the delayed work for processing RX data 395 */ 396 queue_work(rt2x00dev->workqueue, &rt2x00dev->rxdone_work); 397 } 398 399 static bool rt2x00usb_kick_rx_entry(struct queue_entry *entry, void *data) 400 { 401 struct rt2x00_dev *rt2x00dev = entry->queue->rt2x00dev; 402 struct usb_device *usb_dev = to_usb_device_intf(rt2x00dev->dev); 403 struct queue_entry_priv_usb *entry_priv = entry->priv_data; 404 int status; 405 406 if (test_and_set_bit(ENTRY_OWNER_DEVICE_DATA, &entry->flags)) 407 return false; 408 409 rt2x00lib_dmastart(entry); 410 411 usb_fill_bulk_urb(entry_priv->urb, usb_dev, 412 usb_rcvbulkpipe(usb_dev, entry->queue->usb_endpoint), 413 entry->skb->data, entry->skb->len, 414 rt2x00usb_interrupt_rxdone, entry); 415 416 status = usb_submit_urb(entry_priv->urb, GFP_ATOMIC); 417 if (status) { 418 if (rt2x00usb_check_usb_error(rt2x00dev, status)) 419 clear_bit(DEVICE_STATE_PRESENT, &rt2x00dev->flags); 420 set_bit(ENTRY_DATA_IO_FAILED, &entry->flags); 421 rt2x00lib_dmadone(entry); 422 } 423 424 return false; 425 } 426 427 void rt2x00usb_kick_queue(struct data_queue *queue) 428 { 429 switch (queue->qid) { 430 case QID_AC_VO: 431 case QID_AC_VI: 432 case QID_AC_BE: 433 case QID_AC_BK: 434 if (!rt2x00queue_empty(queue)) 435 rt2x00queue_for_each_entry(queue, 436 Q_INDEX_DONE, 437 Q_INDEX, 438 NULL, 439 rt2x00usb_kick_tx_entry); 440 break; 441 case QID_RX: 442 if (!rt2x00queue_full(queue)) 443 rt2x00queue_for_each_entry(queue, 444 Q_INDEX, 445 Q_INDEX_DONE, 446 NULL, 447 rt2x00usb_kick_rx_entry); 448 break; 449 default: 450 break; 451 } 452 } 453 EXPORT_SYMBOL_GPL(rt2x00usb_kick_queue); 454 455 static bool rt2x00usb_flush_entry(struct queue_entry *entry, void *data) 456 { 457 struct rt2x00_dev *rt2x00dev = entry->queue->rt2x00dev; 458 struct queue_entry_priv_usb *entry_priv = entry->priv_data; 459 struct queue_entry_priv_usb_bcn *bcn_priv = entry->priv_data; 460 461 if (!test_bit(ENTRY_OWNER_DEVICE_DATA, &entry->flags)) 462 return false; 463 464 usb_kill_urb(entry_priv->urb); 465 466 /* 467 * Kill guardian urb (if required by driver). 468 */ 469 if ((entry->queue->qid == QID_BEACON) && 470 (rt2x00_has_cap_flag(rt2x00dev, REQUIRE_BEACON_GUARD))) 471 usb_kill_urb(bcn_priv->guardian_urb); 472 473 return false; 474 } 475 476 void rt2x00usb_flush_queue(struct data_queue *queue, bool drop) 477 { 478 struct work_struct *completion; 479 unsigned int i; 480 481 if (drop) 482 rt2x00queue_for_each_entry(queue, Q_INDEX_DONE, Q_INDEX, NULL, 483 rt2x00usb_flush_entry); 484 485 /* 486 * Obtain the queue completion handler 487 */ 488 switch (queue->qid) { 489 case QID_AC_VO: 490 case QID_AC_VI: 491 case QID_AC_BE: 492 case QID_AC_BK: 493 completion = &queue->rt2x00dev->txdone_work; 494 break; 495 case QID_RX: 496 completion = &queue->rt2x00dev->rxdone_work; 497 break; 498 default: 499 return; 500 } 501 502 for (i = 0; i < 10; i++) { 503 /* 504 * Check if the driver is already done, otherwise we 505 * have to sleep a little while to give the driver/hw 506 * the oppurtunity to complete interrupt process itself. 507 */ 508 if (rt2x00queue_empty(queue)) 509 break; 510 511 /* 512 * Schedule the completion handler manually, when this 513 * worker function runs, it should cleanup the queue. 514 */ 515 queue_work(queue->rt2x00dev->workqueue, completion); 516 517 /* 518 * Wait for a little while to give the driver 519 * the oppurtunity to recover itself. 520 */ 521 msleep(50); 522 } 523 } 524 EXPORT_SYMBOL_GPL(rt2x00usb_flush_queue); 525 526 static void rt2x00usb_watchdog_tx_dma(struct data_queue *queue) 527 { 528 rt2x00_warn(queue->rt2x00dev, "TX queue %d DMA timed out, invoke forced reset\n", 529 queue->qid); 530 531 rt2x00queue_stop_queue(queue); 532 rt2x00queue_flush_queue(queue, true); 533 rt2x00queue_start_queue(queue); 534 } 535 536 static int rt2x00usb_dma_timeout(struct data_queue *queue) 537 { 538 struct queue_entry *entry; 539 540 entry = rt2x00queue_get_entry(queue, Q_INDEX_DMA_DONE); 541 return rt2x00queue_dma_timeout(entry); 542 } 543 544 void rt2x00usb_watchdog(struct rt2x00_dev *rt2x00dev) 545 { 546 struct data_queue *queue; 547 548 tx_queue_for_each(rt2x00dev, queue) { 549 if (!rt2x00queue_empty(queue)) { 550 if (rt2x00usb_dma_timeout(queue)) 551 rt2x00usb_watchdog_tx_dma(queue); 552 } 553 } 554 } 555 EXPORT_SYMBOL_GPL(rt2x00usb_watchdog); 556 557 /* 558 * Radio handlers 559 */ 560 void rt2x00usb_disable_radio(struct rt2x00_dev *rt2x00dev) 561 { 562 rt2x00usb_vendor_request_sw(rt2x00dev, USB_RX_CONTROL, 0, 0, 563 REGISTER_TIMEOUT); 564 } 565 EXPORT_SYMBOL_GPL(rt2x00usb_disable_radio); 566 567 /* 568 * Device initialization handlers. 569 */ 570 void rt2x00usb_clear_entry(struct queue_entry *entry) 571 { 572 entry->flags = 0; 573 574 if (entry->queue->qid == QID_RX) 575 rt2x00usb_kick_rx_entry(entry, NULL); 576 } 577 EXPORT_SYMBOL_GPL(rt2x00usb_clear_entry); 578 579 static void rt2x00usb_assign_endpoint(struct data_queue *queue, 580 struct usb_endpoint_descriptor *ep_desc) 581 { 582 struct usb_device *usb_dev = to_usb_device_intf(queue->rt2x00dev->dev); 583 int pipe; 584 585 queue->usb_endpoint = usb_endpoint_num(ep_desc); 586 587 if (queue->qid == QID_RX) { 588 pipe = usb_rcvbulkpipe(usb_dev, queue->usb_endpoint); 589 queue->usb_maxpacket = usb_maxpacket(usb_dev, pipe); 590 } else { 591 pipe = usb_sndbulkpipe(usb_dev, queue->usb_endpoint); 592 queue->usb_maxpacket = usb_maxpacket(usb_dev, pipe); 593 } 594 595 if (!queue->usb_maxpacket) 596 queue->usb_maxpacket = 1; 597 } 598 599 static int rt2x00usb_find_endpoints(struct rt2x00_dev *rt2x00dev) 600 { 601 struct usb_interface *intf = to_usb_interface(rt2x00dev->dev); 602 struct usb_host_interface *intf_desc = intf->cur_altsetting; 603 struct usb_endpoint_descriptor *ep_desc; 604 struct data_queue *queue = rt2x00dev->tx; 605 struct usb_endpoint_descriptor *tx_ep_desc = NULL; 606 unsigned int i; 607 608 /* 609 * Walk through all available endpoints to search for "bulk in" 610 * and "bulk out" endpoints. When we find such endpoints collect 611 * the information we need from the descriptor and assign it 612 * to the queue. 613 */ 614 for (i = 0; i < intf_desc->desc.bNumEndpoints; i++) { 615 ep_desc = &intf_desc->endpoint[i].desc; 616 617 if (usb_endpoint_is_bulk_in(ep_desc)) { 618 rt2x00usb_assign_endpoint(rt2x00dev->rx, ep_desc); 619 } else if (usb_endpoint_is_bulk_out(ep_desc) && 620 (queue != queue_end(rt2x00dev))) { 621 rt2x00usb_assign_endpoint(queue, ep_desc); 622 queue = queue_next(queue); 623 624 tx_ep_desc = ep_desc; 625 } 626 } 627 628 /* 629 * At least 1 endpoint for RX and 1 endpoint for TX must be available. 630 */ 631 if (!rt2x00dev->rx->usb_endpoint || !rt2x00dev->tx->usb_endpoint) { 632 rt2x00_err(rt2x00dev, "Bulk-in/Bulk-out endpoints not found\n"); 633 return -EPIPE; 634 } 635 636 /* 637 * It might be possible not all queues have a dedicated endpoint. 638 * Loop through all TX queues and copy the endpoint information 639 * which we have gathered from already assigned endpoints. 640 */ 641 txall_queue_for_each(rt2x00dev, queue) { 642 if (!queue->usb_endpoint) 643 rt2x00usb_assign_endpoint(queue, tx_ep_desc); 644 } 645 646 return 0; 647 } 648 649 static int rt2x00usb_alloc_entries(struct data_queue *queue) 650 { 651 struct rt2x00_dev *rt2x00dev = queue->rt2x00dev; 652 struct queue_entry_priv_usb *entry_priv; 653 struct queue_entry_priv_usb_bcn *bcn_priv; 654 unsigned int i; 655 656 for (i = 0; i < queue->limit; i++) { 657 entry_priv = queue->entries[i].priv_data; 658 entry_priv->urb = usb_alloc_urb(0, GFP_KERNEL); 659 if (!entry_priv->urb) 660 return -ENOMEM; 661 } 662 663 /* 664 * If this is not the beacon queue or 665 * no guardian byte was required for the beacon, 666 * then we are done. 667 */ 668 if (queue->qid != QID_BEACON || 669 !rt2x00_has_cap_flag(rt2x00dev, REQUIRE_BEACON_GUARD)) 670 return 0; 671 672 for (i = 0; i < queue->limit; i++) { 673 bcn_priv = queue->entries[i].priv_data; 674 bcn_priv->guardian_urb = usb_alloc_urb(0, GFP_KERNEL); 675 if (!bcn_priv->guardian_urb) 676 return -ENOMEM; 677 } 678 679 return 0; 680 } 681 682 static void rt2x00usb_free_entries(struct data_queue *queue) 683 { 684 struct rt2x00_dev *rt2x00dev = queue->rt2x00dev; 685 struct queue_entry_priv_usb *entry_priv; 686 struct queue_entry_priv_usb_bcn *bcn_priv; 687 unsigned int i; 688 689 if (!queue->entries) 690 return; 691 692 for (i = 0; i < queue->limit; i++) { 693 entry_priv = queue->entries[i].priv_data; 694 usb_kill_urb(entry_priv->urb); 695 usb_free_urb(entry_priv->urb); 696 } 697 698 /* 699 * If this is not the beacon queue or 700 * no guardian byte was required for the beacon, 701 * then we are done. 702 */ 703 if (queue->qid != QID_BEACON || 704 !rt2x00_has_cap_flag(rt2x00dev, REQUIRE_BEACON_GUARD)) 705 return; 706 707 for (i = 0; i < queue->limit; i++) { 708 bcn_priv = queue->entries[i].priv_data; 709 usb_kill_urb(bcn_priv->guardian_urb); 710 usb_free_urb(bcn_priv->guardian_urb); 711 } 712 } 713 714 int rt2x00usb_initialize(struct rt2x00_dev *rt2x00dev) 715 { 716 struct data_queue *queue; 717 int status; 718 719 /* 720 * Find endpoints for each queue 721 */ 722 status = rt2x00usb_find_endpoints(rt2x00dev); 723 if (status) 724 goto exit; 725 726 /* 727 * Allocate DMA 728 */ 729 queue_for_each(rt2x00dev, queue) { 730 status = rt2x00usb_alloc_entries(queue); 731 if (status) 732 goto exit; 733 } 734 735 return 0; 736 737 exit: 738 rt2x00usb_uninitialize(rt2x00dev); 739 740 return status; 741 } 742 EXPORT_SYMBOL_GPL(rt2x00usb_initialize); 743 744 void rt2x00usb_uninitialize(struct rt2x00_dev *rt2x00dev) 745 { 746 struct data_queue *queue; 747 748 usb_kill_anchored_urbs(rt2x00dev->anchor); 749 hrtimer_cancel(&rt2x00dev->txstatus_timer); 750 cancel_work_sync(&rt2x00dev->rxdone_work); 751 cancel_work_sync(&rt2x00dev->txdone_work); 752 753 queue_for_each(rt2x00dev, queue) 754 rt2x00usb_free_entries(queue); 755 } 756 EXPORT_SYMBOL_GPL(rt2x00usb_uninitialize); 757 758 /* 759 * USB driver handlers. 760 */ 761 static void rt2x00usb_free_reg(struct rt2x00_dev *rt2x00dev) 762 { 763 kfree(rt2x00dev->rf); 764 rt2x00dev->rf = NULL; 765 766 kfree(rt2x00dev->eeprom); 767 rt2x00dev->eeprom = NULL; 768 769 kfree(rt2x00dev->csr.cache); 770 rt2x00dev->csr.cache = NULL; 771 } 772 773 static int rt2x00usb_alloc_reg(struct rt2x00_dev *rt2x00dev) 774 { 775 rt2x00dev->csr.cache = kzalloc(CSR_CACHE_SIZE, GFP_KERNEL); 776 if (!rt2x00dev->csr.cache) 777 goto exit; 778 779 rt2x00dev->eeprom = kzalloc(rt2x00dev->ops->eeprom_size, GFP_KERNEL); 780 if (!rt2x00dev->eeprom) 781 goto exit; 782 783 rt2x00dev->rf = kzalloc(rt2x00dev->ops->rf_size, GFP_KERNEL); 784 if (!rt2x00dev->rf) 785 goto exit; 786 787 return 0; 788 789 exit: 790 rt2x00_probe_err("Failed to allocate registers\n"); 791 792 rt2x00usb_free_reg(rt2x00dev); 793 794 return -ENOMEM; 795 } 796 797 int rt2x00usb_probe(struct usb_interface *usb_intf, 798 const struct rt2x00_ops *ops) 799 { 800 struct usb_device *usb_dev = interface_to_usbdev(usb_intf); 801 struct ieee80211_hw *hw; 802 struct rt2x00_dev *rt2x00dev; 803 int retval; 804 805 usb_dev = usb_get_dev(usb_dev); 806 usb_reset_device(usb_dev); 807 808 hw = ieee80211_alloc_hw(sizeof(struct rt2x00_dev), ops->hw); 809 if (!hw) { 810 rt2x00_probe_err("Failed to allocate hardware\n"); 811 retval = -ENOMEM; 812 goto exit_put_device; 813 } 814 815 usb_set_intfdata(usb_intf, hw); 816 817 rt2x00dev = hw->priv; 818 rt2x00dev->dev = &usb_intf->dev; 819 rt2x00dev->ops = ops; 820 rt2x00dev->hw = hw; 821 822 rt2x00_set_chip_intf(rt2x00dev, RT2X00_CHIP_INTF_USB); 823 824 INIT_WORK(&rt2x00dev->rxdone_work, rt2x00usb_work_rxdone); 825 INIT_WORK(&rt2x00dev->txdone_work, rt2x00usb_work_txdone); 826 hrtimer_init(&rt2x00dev->txstatus_timer, CLOCK_MONOTONIC, 827 HRTIMER_MODE_REL); 828 829 retval = rt2x00usb_alloc_reg(rt2x00dev); 830 if (retval) 831 goto exit_free_device; 832 833 rt2x00dev->anchor = devm_kmalloc(&usb_dev->dev, 834 sizeof(struct usb_anchor), 835 GFP_KERNEL); 836 if (!rt2x00dev->anchor) { 837 retval = -ENOMEM; 838 goto exit_free_reg; 839 } 840 init_usb_anchor(rt2x00dev->anchor); 841 842 retval = rt2x00lib_probe_dev(rt2x00dev); 843 if (retval) 844 goto exit_free_anchor; 845 846 return 0; 847 848 exit_free_anchor: 849 usb_kill_anchored_urbs(rt2x00dev->anchor); 850 851 exit_free_reg: 852 rt2x00usb_free_reg(rt2x00dev); 853 854 exit_free_device: 855 ieee80211_free_hw(hw); 856 857 exit_put_device: 858 usb_put_dev(usb_dev); 859 860 usb_set_intfdata(usb_intf, NULL); 861 862 return retval; 863 } 864 EXPORT_SYMBOL_GPL(rt2x00usb_probe); 865 866 void rt2x00usb_disconnect(struct usb_interface *usb_intf) 867 { 868 struct ieee80211_hw *hw = usb_get_intfdata(usb_intf); 869 struct rt2x00_dev *rt2x00dev = hw->priv; 870 871 /* 872 * Free all allocated data. 873 */ 874 rt2x00lib_remove_dev(rt2x00dev); 875 rt2x00usb_free_reg(rt2x00dev); 876 ieee80211_free_hw(hw); 877 878 /* 879 * Free the USB device data. 880 */ 881 usb_set_intfdata(usb_intf, NULL); 882 usb_put_dev(interface_to_usbdev(usb_intf)); 883 } 884 EXPORT_SYMBOL_GPL(rt2x00usb_disconnect); 885 886 #ifdef CONFIG_PM 887 int rt2x00usb_suspend(struct usb_interface *usb_intf, pm_message_t state) 888 { 889 struct ieee80211_hw *hw = usb_get_intfdata(usb_intf); 890 struct rt2x00_dev *rt2x00dev = hw->priv; 891 892 return rt2x00lib_suspend(rt2x00dev); 893 } 894 EXPORT_SYMBOL_GPL(rt2x00usb_suspend); 895 896 int rt2x00usb_resume(struct usb_interface *usb_intf) 897 { 898 struct ieee80211_hw *hw = usb_get_intfdata(usb_intf); 899 struct rt2x00_dev *rt2x00dev = hw->priv; 900 901 return rt2x00lib_resume(rt2x00dev); 902 } 903 EXPORT_SYMBOL_GPL(rt2x00usb_resume); 904 #endif /* CONFIG_PM */ 905 906 /* 907 * rt2x00usb module information. 908 */ 909 MODULE_AUTHOR(DRV_PROJECT); 910 MODULE_VERSION(DRV_VERSION); 911 MODULE_DESCRIPTION("rt2x00 usb library"); 912 MODULE_LICENSE("GPL"); 913