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 (status == -EPROTO || status == -ETIMEDOUT) 29 rt2x00dev->num_proto_errs++; 30 else 31 rt2x00dev->num_proto_errs = 0; 32 33 if (rt2x00dev->num_proto_errs > 3) 34 return true; 35 36 return false; 37 } 38 39 /* 40 * Interfacing with the HW. 41 */ 42 int rt2x00usb_vendor_request(struct rt2x00_dev *rt2x00dev, 43 const u8 request, const u8 requesttype, 44 const u16 offset, const u16 value, 45 void *buffer, const u16 buffer_length, 46 const int timeout) 47 { 48 struct usb_device *usb_dev = to_usb_device_intf(rt2x00dev->dev); 49 int status; 50 unsigned int pipe = 51 (requesttype == USB_VENDOR_REQUEST_IN) ? 52 usb_rcvctrlpipe(usb_dev, 0) : usb_sndctrlpipe(usb_dev, 0); 53 unsigned long expire = jiffies + msecs_to_jiffies(timeout); 54 55 if (!test_bit(DEVICE_STATE_PRESENT, &rt2x00dev->flags)) 56 return -ENODEV; 57 58 do { 59 status = usb_control_msg(usb_dev, pipe, request, requesttype, 60 value, offset, buffer, buffer_length, 61 timeout / 2); 62 if (status >= 0) 63 return 0; 64 65 if (rt2x00usb_check_usb_error(rt2x00dev, status)) { 66 /* Device has disappeared. */ 67 clear_bit(DEVICE_STATE_PRESENT, &rt2x00dev->flags); 68 break; 69 } 70 } while (time_before(jiffies, expire)); 71 72 rt2x00_err(rt2x00dev, 73 "Vendor Request 0x%02x failed for offset 0x%04x with error %d\n", 74 request, offset, status); 75 76 return status; 77 } 78 EXPORT_SYMBOL_GPL(rt2x00usb_vendor_request); 79 80 int rt2x00usb_vendor_req_buff_lock(struct rt2x00_dev *rt2x00dev, 81 const u8 request, const u8 requesttype, 82 const u16 offset, void *buffer, 83 const u16 buffer_length, const int timeout) 84 { 85 int status; 86 87 BUG_ON(!mutex_is_locked(&rt2x00dev->csr_mutex)); 88 89 /* 90 * Check for Cache availability. 91 */ 92 if (unlikely(!rt2x00dev->csr.cache || buffer_length > CSR_CACHE_SIZE)) { 93 rt2x00_err(rt2x00dev, "CSR cache not available\n"); 94 return -ENOMEM; 95 } 96 97 if (requesttype == USB_VENDOR_REQUEST_OUT) 98 memcpy(rt2x00dev->csr.cache, buffer, buffer_length); 99 100 status = rt2x00usb_vendor_request(rt2x00dev, request, requesttype, 101 offset, 0, rt2x00dev->csr.cache, 102 buffer_length, timeout); 103 104 if (!status && requesttype == USB_VENDOR_REQUEST_IN) 105 memcpy(buffer, rt2x00dev->csr.cache, buffer_length); 106 107 return status; 108 } 109 EXPORT_SYMBOL_GPL(rt2x00usb_vendor_req_buff_lock); 110 111 int rt2x00usb_vendor_request_buff(struct rt2x00_dev *rt2x00dev, 112 const u8 request, const u8 requesttype, 113 const u16 offset, void *buffer, 114 const u16 buffer_length) 115 { 116 int status = 0; 117 unsigned char *tb; 118 u16 off, len, bsize; 119 120 mutex_lock(&rt2x00dev->csr_mutex); 121 122 tb = (char *)buffer; 123 off = offset; 124 len = buffer_length; 125 while (len && !status) { 126 bsize = min_t(u16, CSR_CACHE_SIZE, len); 127 status = rt2x00usb_vendor_req_buff_lock(rt2x00dev, request, 128 requesttype, off, tb, 129 bsize, REGISTER_TIMEOUT); 130 131 tb += bsize; 132 len -= bsize; 133 off += bsize; 134 } 135 136 mutex_unlock(&rt2x00dev->csr_mutex); 137 138 return status; 139 } 140 EXPORT_SYMBOL_GPL(rt2x00usb_vendor_request_buff); 141 142 int rt2x00usb_regbusy_read(struct rt2x00_dev *rt2x00dev, 143 const unsigned int offset, 144 const struct rt2x00_field32 field, 145 u32 *reg) 146 { 147 unsigned int i; 148 149 if (!test_bit(DEVICE_STATE_PRESENT, &rt2x00dev->flags)) 150 return -ENODEV; 151 152 for (i = 0; i < REGISTER_USB_BUSY_COUNT; i++) { 153 *reg = rt2x00usb_register_read_lock(rt2x00dev, offset); 154 if (!rt2x00_get_field32(*reg, field)) 155 return 1; 156 udelay(REGISTER_BUSY_DELAY); 157 } 158 159 rt2x00_err(rt2x00dev, "Indirect register access failed: offset=0x%.08x, value=0x%.08x\n", 160 offset, *reg); 161 *reg = ~0; 162 163 return 0; 164 } 165 EXPORT_SYMBOL_GPL(rt2x00usb_regbusy_read); 166 167 168 struct rt2x00_async_read_data { 169 __le32 reg; 170 struct usb_ctrlrequest cr; 171 struct rt2x00_dev *rt2x00dev; 172 bool (*callback)(struct rt2x00_dev *, int, u32); 173 }; 174 175 static void rt2x00usb_register_read_async_cb(struct urb *urb) 176 { 177 struct rt2x00_async_read_data *rd = urb->context; 178 if (rd->callback(rd->rt2x00dev, urb->status, le32_to_cpu(rd->reg))) { 179 usb_anchor_urb(urb, rd->rt2x00dev->anchor); 180 if (usb_submit_urb(urb, GFP_ATOMIC) < 0) { 181 usb_unanchor_urb(urb); 182 kfree(rd); 183 } 184 } else 185 kfree(rd); 186 } 187 188 void rt2x00usb_register_read_async(struct rt2x00_dev *rt2x00dev, 189 const unsigned int offset, 190 bool (*callback)(struct rt2x00_dev*, int, u32)) 191 { 192 struct usb_device *usb_dev = to_usb_device_intf(rt2x00dev->dev); 193 struct urb *urb; 194 struct rt2x00_async_read_data *rd; 195 196 rd = kmalloc(sizeof(*rd), GFP_ATOMIC); 197 if (!rd) 198 return; 199 200 urb = usb_alloc_urb(0, GFP_ATOMIC); 201 if (!urb) { 202 kfree(rd); 203 return; 204 } 205 206 rd->rt2x00dev = rt2x00dev; 207 rd->callback = callback; 208 rd->cr.bRequestType = USB_VENDOR_REQUEST_IN; 209 rd->cr.bRequest = USB_MULTI_READ; 210 rd->cr.wValue = 0; 211 rd->cr.wIndex = cpu_to_le16(offset); 212 rd->cr.wLength = cpu_to_le16(sizeof(u32)); 213 214 usb_fill_control_urb(urb, usb_dev, usb_rcvctrlpipe(usb_dev, 0), 215 (unsigned char *)(&rd->cr), &rd->reg, sizeof(rd->reg), 216 rt2x00usb_register_read_async_cb, rd); 217 usb_anchor_urb(urb, rt2x00dev->anchor); 218 if (usb_submit_urb(urb, GFP_ATOMIC) < 0) { 219 usb_unanchor_urb(urb); 220 kfree(rd); 221 } 222 usb_free_urb(urb); 223 } 224 EXPORT_SYMBOL_GPL(rt2x00usb_register_read_async); 225 226 /* 227 * TX data handlers. 228 */ 229 static void rt2x00usb_work_txdone_entry(struct queue_entry *entry) 230 { 231 /* 232 * If the transfer to hardware succeeded, it does not mean the 233 * frame was send out correctly. It only means the frame 234 * was successfully pushed to the hardware, we have no 235 * way to determine the transmission status right now. 236 * (Only indirectly by looking at the failed TX counters 237 * in the register). 238 */ 239 if (test_bit(ENTRY_DATA_IO_FAILED, &entry->flags)) 240 rt2x00lib_txdone_noinfo(entry, TXDONE_FAILURE); 241 else 242 rt2x00lib_txdone_noinfo(entry, TXDONE_UNKNOWN); 243 } 244 245 static void rt2x00usb_work_txdone(struct work_struct *work) 246 { 247 struct rt2x00_dev *rt2x00dev = 248 container_of(work, struct rt2x00_dev, txdone_work); 249 struct data_queue *queue; 250 struct queue_entry *entry; 251 252 tx_queue_for_each(rt2x00dev, queue) { 253 while (!rt2x00queue_empty(queue)) { 254 entry = rt2x00queue_get_entry(queue, Q_INDEX_DONE); 255 256 if (test_bit(ENTRY_OWNER_DEVICE_DATA, &entry->flags) || 257 !test_bit(ENTRY_DATA_STATUS_PENDING, &entry->flags)) 258 break; 259 260 rt2x00usb_work_txdone_entry(entry); 261 } 262 } 263 } 264 265 static void rt2x00usb_interrupt_txdone(struct urb *urb) 266 { 267 struct queue_entry *entry = (struct queue_entry *)urb->context; 268 struct rt2x00_dev *rt2x00dev = entry->queue->rt2x00dev; 269 270 if (!test_bit(ENTRY_OWNER_DEVICE_DATA, &entry->flags)) 271 return; 272 /* 273 * Check if the frame was correctly uploaded 274 */ 275 if (urb->status) 276 set_bit(ENTRY_DATA_IO_FAILED, &entry->flags); 277 /* 278 * Report the frame as DMA done 279 */ 280 rt2x00lib_dmadone(entry); 281 282 if (rt2x00dev->ops->lib->tx_dma_done) 283 rt2x00dev->ops->lib->tx_dma_done(entry); 284 /* 285 * Schedule the delayed work for reading the TX status 286 * from the device. 287 */ 288 if (!rt2x00_has_cap_flag(rt2x00dev, REQUIRE_TXSTATUS_FIFO) || 289 !kfifo_is_empty(&rt2x00dev->txstatus_fifo)) 290 queue_work(rt2x00dev->workqueue, &rt2x00dev->txdone_work); 291 } 292 293 static bool rt2x00usb_kick_tx_entry(struct queue_entry *entry, void *data) 294 { 295 struct rt2x00_dev *rt2x00dev = entry->queue->rt2x00dev; 296 struct usb_device *usb_dev = to_usb_device_intf(rt2x00dev->dev); 297 struct queue_entry_priv_usb *entry_priv = entry->priv_data; 298 u32 length; 299 int status; 300 301 if (!test_and_clear_bit(ENTRY_DATA_PENDING, &entry->flags) || 302 test_bit(ENTRY_DATA_STATUS_PENDING, &entry->flags)) 303 return false; 304 305 /* 306 * USB devices require certain padding at the end of each frame 307 * and urb. Those paddings are not included in skbs. Pass entry 308 * to the driver to determine what the overall length should be. 309 */ 310 length = rt2x00dev->ops->lib->get_tx_data_len(entry); 311 312 status = skb_padto(entry->skb, length); 313 if (unlikely(status)) { 314 /* TODO: report something more appropriate than IO_FAILED. */ 315 rt2x00_warn(rt2x00dev, "TX SKB padding error, out of memory\n"); 316 set_bit(ENTRY_DATA_IO_FAILED, &entry->flags); 317 rt2x00lib_dmadone(entry); 318 319 return false; 320 } 321 322 usb_fill_bulk_urb(entry_priv->urb, usb_dev, 323 usb_sndbulkpipe(usb_dev, entry->queue->usb_endpoint), 324 entry->skb->data, length, 325 rt2x00usb_interrupt_txdone, entry); 326 327 status = usb_submit_urb(entry_priv->urb, GFP_ATOMIC); 328 if (status) { 329 if (rt2x00usb_check_usb_error(rt2x00dev, status)) 330 clear_bit(DEVICE_STATE_PRESENT, &rt2x00dev->flags); 331 set_bit(ENTRY_DATA_IO_FAILED, &entry->flags); 332 rt2x00lib_dmadone(entry); 333 } 334 335 return false; 336 } 337 338 /* 339 * RX data handlers. 340 */ 341 static void rt2x00usb_work_rxdone(struct work_struct *work) 342 { 343 struct rt2x00_dev *rt2x00dev = 344 container_of(work, struct rt2x00_dev, rxdone_work); 345 struct queue_entry *entry; 346 struct skb_frame_desc *skbdesc; 347 u8 rxd[32]; 348 349 while (!rt2x00queue_empty(rt2x00dev->rx)) { 350 entry = rt2x00queue_get_entry(rt2x00dev->rx, Q_INDEX_DONE); 351 352 if (test_bit(ENTRY_OWNER_DEVICE_DATA, &entry->flags) || 353 !test_bit(ENTRY_DATA_STATUS_PENDING, &entry->flags)) 354 break; 355 356 /* 357 * Fill in desc fields of the skb descriptor 358 */ 359 skbdesc = get_skb_frame_desc(entry->skb); 360 skbdesc->desc = rxd; 361 skbdesc->desc_len = entry->queue->desc_size; 362 363 /* 364 * Send the frame to rt2x00lib for further processing. 365 */ 366 rt2x00lib_rxdone(entry, GFP_KERNEL); 367 } 368 } 369 370 static void rt2x00usb_interrupt_rxdone(struct urb *urb) 371 { 372 struct queue_entry *entry = (struct queue_entry *)urb->context; 373 struct rt2x00_dev *rt2x00dev = entry->queue->rt2x00dev; 374 375 if (!test_bit(ENTRY_OWNER_DEVICE_DATA, &entry->flags)) 376 return; 377 378 /* 379 * Check if the received data is simply too small 380 * to be actually valid, or if the urb is signaling 381 * a problem. 382 */ 383 if (urb->actual_length < entry->queue->desc_size || urb->status) 384 set_bit(ENTRY_DATA_IO_FAILED, &entry->flags); 385 386 /* 387 * Report the frame as DMA done 388 */ 389 rt2x00lib_dmadone(entry); 390 391 /* 392 * Schedule the delayed work for reading the RX status 393 * from the device. 394 */ 395 queue_work(rt2x00dev->workqueue, &rt2x00dev->rxdone_work); 396 } 397 398 static bool rt2x00usb_kick_rx_entry(struct queue_entry *entry, void *data) 399 { 400 struct rt2x00_dev *rt2x00dev = entry->queue->rt2x00dev; 401 struct usb_device *usb_dev = to_usb_device_intf(rt2x00dev->dev); 402 struct queue_entry_priv_usb *entry_priv = entry->priv_data; 403 int status; 404 405 if (test_and_set_bit(ENTRY_OWNER_DEVICE_DATA, &entry->flags) || 406 test_bit(ENTRY_DATA_STATUS_PENDING, &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 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, 0); 590 } else { 591 pipe = usb_sndbulkpipe(usb_dev, queue->usb_endpoint); 592 queue->usb_maxpacket = usb_maxpacket(usb_dev, pipe, 1); 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, state); 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