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