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 break; 354 355 /* 356 * Fill in desc fields of the skb descriptor 357 */ 358 skbdesc = get_skb_frame_desc(entry->skb); 359 skbdesc->desc = rxd; 360 skbdesc->desc_len = entry->queue->desc_size; 361 362 /* 363 * Send the frame to rt2x00lib for further processing. 364 */ 365 rt2x00lib_rxdone(entry, GFP_KERNEL); 366 } 367 } 368 369 static void rt2x00usb_interrupt_rxdone(struct urb *urb) 370 { 371 struct queue_entry *entry = (struct queue_entry *)urb->context; 372 struct rt2x00_dev *rt2x00dev = entry->queue->rt2x00dev; 373 374 if (!test_bit(ENTRY_OWNER_DEVICE_DATA, &entry->flags)) 375 return; 376 377 /* 378 * Check if the received data is simply too small 379 * to be actually valid, or if the urb is signaling 380 * a problem. 381 */ 382 if (urb->actual_length < entry->queue->desc_size || urb->status) 383 set_bit(ENTRY_DATA_IO_FAILED, &entry->flags); 384 385 /* 386 * Report the frame as DMA done 387 */ 388 rt2x00lib_dmadone(entry); 389 390 /* 391 * Schedule the delayed work for processing RX data 392 */ 393 queue_work(rt2x00dev->workqueue, &rt2x00dev->rxdone_work); 394 } 395 396 static bool rt2x00usb_kick_rx_entry(struct queue_entry *entry, void *data) 397 { 398 struct rt2x00_dev *rt2x00dev = entry->queue->rt2x00dev; 399 struct usb_device *usb_dev = to_usb_device_intf(rt2x00dev->dev); 400 struct queue_entry_priv_usb *entry_priv = entry->priv_data; 401 int status; 402 403 if (test_and_set_bit(ENTRY_OWNER_DEVICE_DATA, &entry->flags)) 404 return false; 405 406 rt2x00lib_dmastart(entry); 407 408 usb_fill_bulk_urb(entry_priv->urb, usb_dev, 409 usb_rcvbulkpipe(usb_dev, entry->queue->usb_endpoint), 410 entry->skb->data, entry->skb->len, 411 rt2x00usb_interrupt_rxdone, entry); 412 413 status = usb_submit_urb(entry_priv->urb, GFP_ATOMIC); 414 if (status) { 415 if (rt2x00usb_check_usb_error(rt2x00dev, status)) 416 clear_bit(DEVICE_STATE_PRESENT, &rt2x00dev->flags); 417 set_bit(ENTRY_DATA_IO_FAILED, &entry->flags); 418 rt2x00lib_dmadone(entry); 419 } 420 421 return false; 422 } 423 424 void rt2x00usb_kick_queue(struct data_queue *queue) 425 { 426 switch (queue->qid) { 427 case QID_AC_VO: 428 case QID_AC_VI: 429 case QID_AC_BE: 430 case QID_AC_BK: 431 if (!rt2x00queue_empty(queue)) 432 rt2x00queue_for_each_entry(queue, 433 Q_INDEX_DONE, 434 Q_INDEX, 435 NULL, 436 rt2x00usb_kick_tx_entry); 437 break; 438 case QID_RX: 439 if (!rt2x00queue_full(queue)) 440 rt2x00queue_for_each_entry(queue, 441 Q_INDEX, 442 Q_INDEX_DONE, 443 NULL, 444 rt2x00usb_kick_rx_entry); 445 break; 446 default: 447 break; 448 } 449 } 450 EXPORT_SYMBOL_GPL(rt2x00usb_kick_queue); 451 452 static bool rt2x00usb_flush_entry(struct queue_entry *entry, void *data) 453 { 454 struct rt2x00_dev *rt2x00dev = entry->queue->rt2x00dev; 455 struct queue_entry_priv_usb *entry_priv = entry->priv_data; 456 struct queue_entry_priv_usb_bcn *bcn_priv = entry->priv_data; 457 458 if (!test_bit(ENTRY_OWNER_DEVICE_DATA, &entry->flags)) 459 return false; 460 461 usb_kill_urb(entry_priv->urb); 462 463 /* 464 * Kill guardian urb (if required by driver). 465 */ 466 if ((entry->queue->qid == QID_BEACON) && 467 (rt2x00_has_cap_flag(rt2x00dev, REQUIRE_BEACON_GUARD))) 468 usb_kill_urb(bcn_priv->guardian_urb); 469 470 return false; 471 } 472 473 void rt2x00usb_flush_queue(struct data_queue *queue, bool drop) 474 { 475 struct work_struct *completion; 476 unsigned int i; 477 478 if (drop) 479 rt2x00queue_for_each_entry(queue, Q_INDEX_DONE, Q_INDEX, NULL, 480 rt2x00usb_flush_entry); 481 482 /* 483 * Obtain the queue completion handler 484 */ 485 switch (queue->qid) { 486 case QID_AC_VO: 487 case QID_AC_VI: 488 case QID_AC_BE: 489 case QID_AC_BK: 490 completion = &queue->rt2x00dev->txdone_work; 491 break; 492 case QID_RX: 493 completion = &queue->rt2x00dev->rxdone_work; 494 break; 495 default: 496 return; 497 } 498 499 for (i = 0; i < 10; i++) { 500 /* 501 * Check if the driver is already done, otherwise we 502 * have to sleep a little while to give the driver/hw 503 * the oppurtunity to complete interrupt process itself. 504 */ 505 if (rt2x00queue_empty(queue)) 506 break; 507 508 /* 509 * Schedule the completion handler manually, when this 510 * worker function runs, it should cleanup the queue. 511 */ 512 queue_work(queue->rt2x00dev->workqueue, completion); 513 514 /* 515 * Wait for a little while to give the driver 516 * the oppurtunity to recover itself. 517 */ 518 msleep(50); 519 } 520 } 521 EXPORT_SYMBOL_GPL(rt2x00usb_flush_queue); 522 523 static void rt2x00usb_watchdog_tx_dma(struct data_queue *queue) 524 { 525 rt2x00_warn(queue->rt2x00dev, "TX queue %d DMA timed out, invoke forced reset\n", 526 queue->qid); 527 528 rt2x00queue_stop_queue(queue); 529 rt2x00queue_flush_queue(queue, true); 530 rt2x00queue_start_queue(queue); 531 } 532 533 static int rt2x00usb_dma_timeout(struct data_queue *queue) 534 { 535 struct queue_entry *entry; 536 537 entry = rt2x00queue_get_entry(queue, Q_INDEX_DMA_DONE); 538 return rt2x00queue_dma_timeout(entry); 539 } 540 541 void rt2x00usb_watchdog(struct rt2x00_dev *rt2x00dev) 542 { 543 struct data_queue *queue; 544 545 tx_queue_for_each(rt2x00dev, queue) { 546 if (!rt2x00queue_empty(queue)) { 547 if (rt2x00usb_dma_timeout(queue)) 548 rt2x00usb_watchdog_tx_dma(queue); 549 } 550 } 551 } 552 EXPORT_SYMBOL_GPL(rt2x00usb_watchdog); 553 554 /* 555 * Radio handlers 556 */ 557 void rt2x00usb_disable_radio(struct rt2x00_dev *rt2x00dev) 558 { 559 rt2x00usb_vendor_request_sw(rt2x00dev, USB_RX_CONTROL, 0, 0, 560 REGISTER_TIMEOUT); 561 } 562 EXPORT_SYMBOL_GPL(rt2x00usb_disable_radio); 563 564 /* 565 * Device initialization handlers. 566 */ 567 void rt2x00usb_clear_entry(struct queue_entry *entry) 568 { 569 entry->flags = 0; 570 571 if (entry->queue->qid == QID_RX) 572 rt2x00usb_kick_rx_entry(entry, NULL); 573 } 574 EXPORT_SYMBOL_GPL(rt2x00usb_clear_entry); 575 576 static void rt2x00usb_assign_endpoint(struct data_queue *queue, 577 struct usb_endpoint_descriptor *ep_desc) 578 { 579 struct usb_device *usb_dev = to_usb_device_intf(queue->rt2x00dev->dev); 580 int pipe; 581 582 queue->usb_endpoint = usb_endpoint_num(ep_desc); 583 584 if (queue->qid == QID_RX) { 585 pipe = usb_rcvbulkpipe(usb_dev, queue->usb_endpoint); 586 queue->usb_maxpacket = usb_maxpacket(usb_dev, pipe, 0); 587 } else { 588 pipe = usb_sndbulkpipe(usb_dev, queue->usb_endpoint); 589 queue->usb_maxpacket = usb_maxpacket(usb_dev, pipe, 1); 590 } 591 592 if (!queue->usb_maxpacket) 593 queue->usb_maxpacket = 1; 594 } 595 596 static int rt2x00usb_find_endpoints(struct rt2x00_dev *rt2x00dev) 597 { 598 struct usb_interface *intf = to_usb_interface(rt2x00dev->dev); 599 struct usb_host_interface *intf_desc = intf->cur_altsetting; 600 struct usb_endpoint_descriptor *ep_desc; 601 struct data_queue *queue = rt2x00dev->tx; 602 struct usb_endpoint_descriptor *tx_ep_desc = NULL; 603 unsigned int i; 604 605 /* 606 * Walk through all available endpoints to search for "bulk in" 607 * and "bulk out" endpoints. When we find such endpoints collect 608 * the information we need from the descriptor and assign it 609 * to the queue. 610 */ 611 for (i = 0; i < intf_desc->desc.bNumEndpoints; i++) { 612 ep_desc = &intf_desc->endpoint[i].desc; 613 614 if (usb_endpoint_is_bulk_in(ep_desc)) { 615 rt2x00usb_assign_endpoint(rt2x00dev->rx, ep_desc); 616 } else if (usb_endpoint_is_bulk_out(ep_desc) && 617 (queue != queue_end(rt2x00dev))) { 618 rt2x00usb_assign_endpoint(queue, ep_desc); 619 queue = queue_next(queue); 620 621 tx_ep_desc = ep_desc; 622 } 623 } 624 625 /* 626 * At least 1 endpoint for RX and 1 endpoint for TX must be available. 627 */ 628 if (!rt2x00dev->rx->usb_endpoint || !rt2x00dev->tx->usb_endpoint) { 629 rt2x00_err(rt2x00dev, "Bulk-in/Bulk-out endpoints not found\n"); 630 return -EPIPE; 631 } 632 633 /* 634 * It might be possible not all queues have a dedicated endpoint. 635 * Loop through all TX queues and copy the endpoint information 636 * which we have gathered from already assigned endpoints. 637 */ 638 txall_queue_for_each(rt2x00dev, queue) { 639 if (!queue->usb_endpoint) 640 rt2x00usb_assign_endpoint(queue, tx_ep_desc); 641 } 642 643 return 0; 644 } 645 646 static int rt2x00usb_alloc_entries(struct data_queue *queue) 647 { 648 struct rt2x00_dev *rt2x00dev = queue->rt2x00dev; 649 struct queue_entry_priv_usb *entry_priv; 650 struct queue_entry_priv_usb_bcn *bcn_priv; 651 unsigned int i; 652 653 for (i = 0; i < queue->limit; i++) { 654 entry_priv = queue->entries[i].priv_data; 655 entry_priv->urb = usb_alloc_urb(0, GFP_KERNEL); 656 if (!entry_priv->urb) 657 return -ENOMEM; 658 } 659 660 /* 661 * If this is not the beacon queue or 662 * no guardian byte was required for the beacon, 663 * then we are done. 664 */ 665 if (queue->qid != QID_BEACON || 666 !rt2x00_has_cap_flag(rt2x00dev, REQUIRE_BEACON_GUARD)) 667 return 0; 668 669 for (i = 0; i < queue->limit; i++) { 670 bcn_priv = queue->entries[i].priv_data; 671 bcn_priv->guardian_urb = usb_alloc_urb(0, GFP_KERNEL); 672 if (!bcn_priv->guardian_urb) 673 return -ENOMEM; 674 } 675 676 return 0; 677 } 678 679 static void rt2x00usb_free_entries(struct data_queue *queue) 680 { 681 struct rt2x00_dev *rt2x00dev = queue->rt2x00dev; 682 struct queue_entry_priv_usb *entry_priv; 683 struct queue_entry_priv_usb_bcn *bcn_priv; 684 unsigned int i; 685 686 if (!queue->entries) 687 return; 688 689 for (i = 0; i < queue->limit; i++) { 690 entry_priv = queue->entries[i].priv_data; 691 usb_kill_urb(entry_priv->urb); 692 usb_free_urb(entry_priv->urb); 693 } 694 695 /* 696 * If this is not the beacon queue or 697 * no guardian byte was required for the beacon, 698 * then we are done. 699 */ 700 if (queue->qid != QID_BEACON || 701 !rt2x00_has_cap_flag(rt2x00dev, REQUIRE_BEACON_GUARD)) 702 return; 703 704 for (i = 0; i < queue->limit; i++) { 705 bcn_priv = queue->entries[i].priv_data; 706 usb_kill_urb(bcn_priv->guardian_urb); 707 usb_free_urb(bcn_priv->guardian_urb); 708 } 709 } 710 711 int rt2x00usb_initialize(struct rt2x00_dev *rt2x00dev) 712 { 713 struct data_queue *queue; 714 int status; 715 716 /* 717 * Find endpoints for each queue 718 */ 719 status = rt2x00usb_find_endpoints(rt2x00dev); 720 if (status) 721 goto exit; 722 723 /* 724 * Allocate DMA 725 */ 726 queue_for_each(rt2x00dev, queue) { 727 status = rt2x00usb_alloc_entries(queue); 728 if (status) 729 goto exit; 730 } 731 732 return 0; 733 734 exit: 735 rt2x00usb_uninitialize(rt2x00dev); 736 737 return status; 738 } 739 EXPORT_SYMBOL_GPL(rt2x00usb_initialize); 740 741 void rt2x00usb_uninitialize(struct rt2x00_dev *rt2x00dev) 742 { 743 struct data_queue *queue; 744 745 usb_kill_anchored_urbs(rt2x00dev->anchor); 746 hrtimer_cancel(&rt2x00dev->txstatus_timer); 747 cancel_work_sync(&rt2x00dev->rxdone_work); 748 cancel_work_sync(&rt2x00dev->txdone_work); 749 750 queue_for_each(rt2x00dev, queue) 751 rt2x00usb_free_entries(queue); 752 } 753 EXPORT_SYMBOL_GPL(rt2x00usb_uninitialize); 754 755 /* 756 * USB driver handlers. 757 */ 758 static void rt2x00usb_free_reg(struct rt2x00_dev *rt2x00dev) 759 { 760 kfree(rt2x00dev->rf); 761 rt2x00dev->rf = NULL; 762 763 kfree(rt2x00dev->eeprom); 764 rt2x00dev->eeprom = NULL; 765 766 kfree(rt2x00dev->csr.cache); 767 rt2x00dev->csr.cache = NULL; 768 } 769 770 static int rt2x00usb_alloc_reg(struct rt2x00_dev *rt2x00dev) 771 { 772 rt2x00dev->csr.cache = kzalloc(CSR_CACHE_SIZE, GFP_KERNEL); 773 if (!rt2x00dev->csr.cache) 774 goto exit; 775 776 rt2x00dev->eeprom = kzalloc(rt2x00dev->ops->eeprom_size, GFP_KERNEL); 777 if (!rt2x00dev->eeprom) 778 goto exit; 779 780 rt2x00dev->rf = kzalloc(rt2x00dev->ops->rf_size, GFP_KERNEL); 781 if (!rt2x00dev->rf) 782 goto exit; 783 784 return 0; 785 786 exit: 787 rt2x00_probe_err("Failed to allocate registers\n"); 788 789 rt2x00usb_free_reg(rt2x00dev); 790 791 return -ENOMEM; 792 } 793 794 int rt2x00usb_probe(struct usb_interface *usb_intf, 795 const struct rt2x00_ops *ops) 796 { 797 struct usb_device *usb_dev = interface_to_usbdev(usb_intf); 798 struct ieee80211_hw *hw; 799 struct rt2x00_dev *rt2x00dev; 800 int retval; 801 802 usb_dev = usb_get_dev(usb_dev); 803 usb_reset_device(usb_dev); 804 805 hw = ieee80211_alloc_hw(sizeof(struct rt2x00_dev), ops->hw); 806 if (!hw) { 807 rt2x00_probe_err("Failed to allocate hardware\n"); 808 retval = -ENOMEM; 809 goto exit_put_device; 810 } 811 812 usb_set_intfdata(usb_intf, hw); 813 814 rt2x00dev = hw->priv; 815 rt2x00dev->dev = &usb_intf->dev; 816 rt2x00dev->ops = ops; 817 rt2x00dev->hw = hw; 818 819 rt2x00_set_chip_intf(rt2x00dev, RT2X00_CHIP_INTF_USB); 820 821 INIT_WORK(&rt2x00dev->rxdone_work, rt2x00usb_work_rxdone); 822 INIT_WORK(&rt2x00dev->txdone_work, rt2x00usb_work_txdone); 823 hrtimer_init(&rt2x00dev->txstatus_timer, CLOCK_MONOTONIC, 824 HRTIMER_MODE_REL); 825 826 retval = rt2x00usb_alloc_reg(rt2x00dev); 827 if (retval) 828 goto exit_free_device; 829 830 rt2x00dev->anchor = devm_kmalloc(&usb_dev->dev, 831 sizeof(struct usb_anchor), 832 GFP_KERNEL); 833 if (!rt2x00dev->anchor) { 834 retval = -ENOMEM; 835 goto exit_free_reg; 836 } 837 init_usb_anchor(rt2x00dev->anchor); 838 839 retval = rt2x00lib_probe_dev(rt2x00dev); 840 if (retval) 841 goto exit_free_anchor; 842 843 return 0; 844 845 exit_free_anchor: 846 usb_kill_anchored_urbs(rt2x00dev->anchor); 847 848 exit_free_reg: 849 rt2x00usb_free_reg(rt2x00dev); 850 851 exit_free_device: 852 ieee80211_free_hw(hw); 853 854 exit_put_device: 855 usb_put_dev(usb_dev); 856 857 usb_set_intfdata(usb_intf, NULL); 858 859 return retval; 860 } 861 EXPORT_SYMBOL_GPL(rt2x00usb_probe); 862 863 void rt2x00usb_disconnect(struct usb_interface *usb_intf) 864 { 865 struct ieee80211_hw *hw = usb_get_intfdata(usb_intf); 866 struct rt2x00_dev *rt2x00dev = hw->priv; 867 868 /* 869 * Free all allocated data. 870 */ 871 rt2x00lib_remove_dev(rt2x00dev); 872 rt2x00usb_free_reg(rt2x00dev); 873 ieee80211_free_hw(hw); 874 875 /* 876 * Free the USB device data. 877 */ 878 usb_set_intfdata(usb_intf, NULL); 879 usb_put_dev(interface_to_usbdev(usb_intf)); 880 } 881 EXPORT_SYMBOL_GPL(rt2x00usb_disconnect); 882 883 #ifdef CONFIG_PM 884 int rt2x00usb_suspend(struct usb_interface *usb_intf, pm_message_t state) 885 { 886 struct ieee80211_hw *hw = usb_get_intfdata(usb_intf); 887 struct rt2x00_dev *rt2x00dev = hw->priv; 888 889 return rt2x00lib_suspend(rt2x00dev); 890 } 891 EXPORT_SYMBOL_GPL(rt2x00usb_suspend); 892 893 int rt2x00usb_resume(struct usb_interface *usb_intf) 894 { 895 struct ieee80211_hw *hw = usb_get_intfdata(usb_intf); 896 struct rt2x00_dev *rt2x00dev = hw->priv; 897 898 return rt2x00lib_resume(rt2x00dev); 899 } 900 EXPORT_SYMBOL_GPL(rt2x00usb_resume); 901 #endif /* CONFIG_PM */ 902 903 /* 904 * rt2x00usb module information. 905 */ 906 MODULE_AUTHOR(DRV_PROJECT); 907 MODULE_VERSION(DRV_VERSION); 908 MODULE_DESCRIPTION("rt2x00 usb library"); 909 MODULE_LICENSE("GPL"); 910