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