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 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 usb_anchor_urb(entry_priv->urb, rt2x00dev->anchor); 323 status = usb_submit_urb(entry_priv->urb, GFP_ATOMIC); 324 if (status) { 325 usb_unanchor_urb(entry_priv->urb); 326 if (status == -ENODEV) 327 clear_bit(DEVICE_STATE_PRESENT, &rt2x00dev->flags); 328 set_bit(ENTRY_DATA_IO_FAILED, &entry->flags); 329 rt2x00lib_dmadone(entry); 330 } 331 332 return false; 333 } 334 335 /* 336 * RX data handlers. 337 */ 338 static void rt2x00usb_work_rxdone(struct work_struct *work) 339 { 340 struct rt2x00_dev *rt2x00dev = 341 container_of(work, struct rt2x00_dev, rxdone_work); 342 struct queue_entry *entry; 343 struct skb_frame_desc *skbdesc; 344 u8 rxd[32]; 345 346 while (!rt2x00queue_empty(rt2x00dev->rx)) { 347 entry = rt2x00queue_get_entry(rt2x00dev->rx, Q_INDEX_DONE); 348 349 if (test_bit(ENTRY_OWNER_DEVICE_DATA, &entry->flags) || 350 !test_bit(ENTRY_DATA_STATUS_PENDING, &entry->flags)) 351 break; 352 353 /* 354 * Fill in desc fields of the skb descriptor 355 */ 356 skbdesc = get_skb_frame_desc(entry->skb); 357 skbdesc->desc = rxd; 358 skbdesc->desc_len = entry->queue->desc_size; 359 360 /* 361 * Send the frame to rt2x00lib for further processing. 362 */ 363 rt2x00lib_rxdone(entry, GFP_KERNEL); 364 } 365 } 366 367 static void rt2x00usb_interrupt_rxdone(struct urb *urb) 368 { 369 struct queue_entry *entry = (struct queue_entry *)urb->context; 370 struct rt2x00_dev *rt2x00dev = entry->queue->rt2x00dev; 371 372 if (!test_and_clear_bit(ENTRY_OWNER_DEVICE_DATA, &entry->flags)) 373 return; 374 375 /* 376 * Report the frame as DMA done 377 */ 378 rt2x00lib_dmadone(entry); 379 380 /* 381 * Check if the received data is simply too small 382 * to be actually valid, or if the urb is signaling 383 * a problem. 384 */ 385 if (urb->actual_length < entry->queue->desc_size || urb->status) 386 set_bit(ENTRY_DATA_IO_FAILED, &entry->flags); 387 388 /* 389 * Schedule the delayed work for reading the RX status 390 * from the device. 391 */ 392 queue_work(rt2x00dev->workqueue, &rt2x00dev->rxdone_work); 393 } 394 395 static bool rt2x00usb_kick_rx_entry(struct queue_entry *entry, void *data) 396 { 397 struct rt2x00_dev *rt2x00dev = entry->queue->rt2x00dev; 398 struct usb_device *usb_dev = to_usb_device_intf(rt2x00dev->dev); 399 struct queue_entry_priv_usb *entry_priv = entry->priv_data; 400 int status; 401 402 if (test_and_set_bit(ENTRY_OWNER_DEVICE_DATA, &entry->flags) || 403 test_bit(ENTRY_DATA_STATUS_PENDING, &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 usb_anchor_urb(entry_priv->urb, rt2x00dev->anchor); 414 status = usb_submit_urb(entry_priv->urb, GFP_ATOMIC); 415 if (status) { 416 usb_unanchor_urb(entry_priv->urb); 417 if (status == -ENODEV) 418 clear_bit(DEVICE_STATE_PRESENT, &rt2x00dev->flags); 419 set_bit(ENTRY_DATA_IO_FAILED, &entry->flags); 420 rt2x00lib_dmadone(entry); 421 } 422 423 return false; 424 } 425 426 void rt2x00usb_kick_queue(struct data_queue *queue) 427 { 428 switch (queue->qid) { 429 case QID_AC_VO: 430 case QID_AC_VI: 431 case QID_AC_BE: 432 case QID_AC_BK: 433 if (!rt2x00queue_empty(queue)) 434 rt2x00queue_for_each_entry(queue, 435 Q_INDEX_DONE, 436 Q_INDEX, 437 NULL, 438 rt2x00usb_kick_tx_entry); 439 break; 440 case QID_RX: 441 if (!rt2x00queue_full(queue)) 442 rt2x00queue_for_each_entry(queue, 443 Q_INDEX, 444 Q_INDEX_DONE, 445 NULL, 446 rt2x00usb_kick_rx_entry); 447 break; 448 default: 449 break; 450 } 451 } 452 EXPORT_SYMBOL_GPL(rt2x00usb_kick_queue); 453 454 static bool rt2x00usb_flush_entry(struct queue_entry *entry, void *data) 455 { 456 struct rt2x00_dev *rt2x00dev = entry->queue->rt2x00dev; 457 struct queue_entry_priv_usb *entry_priv = entry->priv_data; 458 struct queue_entry_priv_usb_bcn *bcn_priv = entry->priv_data; 459 460 if (!test_bit(ENTRY_OWNER_DEVICE_DATA, &entry->flags)) 461 return false; 462 463 usb_kill_urb(entry_priv->urb); 464 465 /* 466 * Kill guardian urb (if required by driver). 467 */ 468 if ((entry->queue->qid == QID_BEACON) && 469 (rt2x00_has_cap_flag(rt2x00dev, REQUIRE_BEACON_GUARD))) 470 usb_kill_urb(bcn_priv->guardian_urb); 471 472 return false; 473 } 474 475 void rt2x00usb_flush_queue(struct data_queue *queue, bool drop) 476 { 477 struct work_struct *completion; 478 unsigned int i; 479 480 if (drop) 481 rt2x00queue_for_each_entry(queue, Q_INDEX_DONE, Q_INDEX, NULL, 482 rt2x00usb_flush_entry); 483 484 /* 485 * Obtain the queue completion handler 486 */ 487 switch (queue->qid) { 488 case QID_AC_VO: 489 case QID_AC_VI: 490 case QID_AC_BE: 491 case QID_AC_BK: 492 completion = &queue->rt2x00dev->txdone_work; 493 break; 494 case QID_RX: 495 completion = &queue->rt2x00dev->rxdone_work; 496 break; 497 default: 498 return; 499 } 500 501 for (i = 0; i < 10; i++) { 502 /* 503 * Check if the driver is already done, otherwise we 504 * have to sleep a little while to give the driver/hw 505 * the oppurtunity to complete interrupt process itself. 506 */ 507 if (rt2x00queue_empty(queue)) 508 break; 509 510 /* 511 * Schedule the completion handler manually, when this 512 * worker function runs, it should cleanup the queue. 513 */ 514 queue_work(queue->rt2x00dev->workqueue, completion); 515 516 /* 517 * Wait for a little while to give the driver 518 * the oppurtunity to recover itself. 519 */ 520 msleep(10); 521 } 522 } 523 EXPORT_SYMBOL_GPL(rt2x00usb_flush_queue); 524 525 static void rt2x00usb_watchdog_tx_dma(struct data_queue *queue) 526 { 527 rt2x00_warn(queue->rt2x00dev, "TX queue %d DMA timed out, invoke forced forced reset\n", 528 queue->qid); 529 530 rt2x00queue_stop_queue(queue); 531 rt2x00queue_flush_queue(queue, true); 532 rt2x00queue_start_queue(queue); 533 } 534 535 static int rt2x00usb_dma_timeout(struct data_queue *queue) 536 { 537 struct queue_entry *entry; 538 539 entry = rt2x00queue_get_entry(queue, Q_INDEX_DMA_DONE); 540 return rt2x00queue_dma_timeout(entry); 541 } 542 543 void rt2x00usb_watchdog(struct rt2x00_dev *rt2x00dev) 544 { 545 struct data_queue *queue; 546 547 tx_queue_for_each(rt2x00dev, queue) { 548 if (!rt2x00queue_empty(queue)) { 549 if (rt2x00usb_dma_timeout(queue)) 550 rt2x00usb_watchdog_tx_dma(queue); 551 } 552 } 553 } 554 EXPORT_SYMBOL_GPL(rt2x00usb_watchdog); 555 556 /* 557 * Radio handlers 558 */ 559 void rt2x00usb_disable_radio(struct rt2x00_dev *rt2x00dev) 560 { 561 rt2x00usb_vendor_request_sw(rt2x00dev, USB_RX_CONTROL, 0, 0, 562 REGISTER_TIMEOUT); 563 } 564 EXPORT_SYMBOL_GPL(rt2x00usb_disable_radio); 565 566 /* 567 * Device initialization handlers. 568 */ 569 void rt2x00usb_clear_entry(struct queue_entry *entry) 570 { 571 entry->flags = 0; 572 573 if (entry->queue->qid == QID_RX) 574 rt2x00usb_kick_rx_entry(entry, NULL); 575 } 576 EXPORT_SYMBOL_GPL(rt2x00usb_clear_entry); 577 578 static void rt2x00usb_assign_endpoint(struct data_queue *queue, 579 struct usb_endpoint_descriptor *ep_desc) 580 { 581 struct usb_device *usb_dev = to_usb_device_intf(queue->rt2x00dev->dev); 582 int pipe; 583 584 queue->usb_endpoint = usb_endpoint_num(ep_desc); 585 586 if (queue->qid == QID_RX) { 587 pipe = usb_rcvbulkpipe(usb_dev, queue->usb_endpoint); 588 queue->usb_maxpacket = usb_maxpacket(usb_dev, pipe, 0); 589 } else { 590 pipe = usb_sndbulkpipe(usb_dev, queue->usb_endpoint); 591 queue->usb_maxpacket = usb_maxpacket(usb_dev, pipe, 1); 592 } 593 594 if (!queue->usb_maxpacket) 595 queue->usb_maxpacket = 1; 596 } 597 598 static int rt2x00usb_find_endpoints(struct rt2x00_dev *rt2x00dev) 599 { 600 struct usb_interface *intf = to_usb_interface(rt2x00dev->dev); 601 struct usb_host_interface *intf_desc = intf->cur_altsetting; 602 struct usb_endpoint_descriptor *ep_desc; 603 struct data_queue *queue = rt2x00dev->tx; 604 struct usb_endpoint_descriptor *tx_ep_desc = NULL; 605 unsigned int i; 606 607 /* 608 * Walk through all available endpoints to search for "bulk in" 609 * and "bulk out" endpoints. When we find such endpoints collect 610 * the information we need from the descriptor and assign it 611 * to the queue. 612 */ 613 for (i = 0; i < intf_desc->desc.bNumEndpoints; i++) { 614 ep_desc = &intf_desc->endpoint[i].desc; 615 616 if (usb_endpoint_is_bulk_in(ep_desc)) { 617 rt2x00usb_assign_endpoint(rt2x00dev->rx, ep_desc); 618 } else if (usb_endpoint_is_bulk_out(ep_desc) && 619 (queue != queue_end(rt2x00dev))) { 620 rt2x00usb_assign_endpoint(queue, ep_desc); 621 queue = queue_next(queue); 622 623 tx_ep_desc = ep_desc; 624 } 625 } 626 627 /* 628 * At least 1 endpoint for RX and 1 endpoint for TX must be available. 629 */ 630 if (!rt2x00dev->rx->usb_endpoint || !rt2x00dev->tx->usb_endpoint) { 631 rt2x00_err(rt2x00dev, "Bulk-in/Bulk-out endpoints not found\n"); 632 return -EPIPE; 633 } 634 635 /* 636 * It might be possible not all queues have a dedicated endpoint. 637 * Loop through all TX queues and copy the endpoint information 638 * which we have gathered from already assigned endpoints. 639 */ 640 txall_queue_for_each(rt2x00dev, queue) { 641 if (!queue->usb_endpoint) 642 rt2x00usb_assign_endpoint(queue, tx_ep_desc); 643 } 644 645 return 0; 646 } 647 648 static int rt2x00usb_alloc_entries(struct data_queue *queue) 649 { 650 struct rt2x00_dev *rt2x00dev = queue->rt2x00dev; 651 struct queue_entry_priv_usb *entry_priv; 652 struct queue_entry_priv_usb_bcn *bcn_priv; 653 unsigned int i; 654 655 for (i = 0; i < queue->limit; i++) { 656 entry_priv = queue->entries[i].priv_data; 657 entry_priv->urb = usb_alloc_urb(0, GFP_KERNEL); 658 if (!entry_priv->urb) 659 return -ENOMEM; 660 } 661 662 /* 663 * If this is not the beacon queue or 664 * no guardian byte was required for the beacon, 665 * then we are done. 666 */ 667 if (queue->qid != QID_BEACON || 668 !rt2x00_has_cap_flag(rt2x00dev, REQUIRE_BEACON_GUARD)) 669 return 0; 670 671 for (i = 0; i < queue->limit; i++) { 672 bcn_priv = queue->entries[i].priv_data; 673 bcn_priv->guardian_urb = usb_alloc_urb(0, GFP_KERNEL); 674 if (!bcn_priv->guardian_urb) 675 return -ENOMEM; 676 } 677 678 return 0; 679 } 680 681 static void rt2x00usb_free_entries(struct data_queue *queue) 682 { 683 struct rt2x00_dev *rt2x00dev = queue->rt2x00dev; 684 struct queue_entry_priv_usb *entry_priv; 685 struct queue_entry_priv_usb_bcn *bcn_priv; 686 unsigned int i; 687 688 if (!queue->entries) 689 return; 690 691 for (i = 0; i < queue->limit; i++) { 692 entry_priv = queue->entries[i].priv_data; 693 usb_kill_urb(entry_priv->urb); 694 usb_free_urb(entry_priv->urb); 695 } 696 697 /* 698 * If this is not the beacon queue or 699 * no guardian byte was required for the beacon, 700 * then we are done. 701 */ 702 if (queue->qid != QID_BEACON || 703 !rt2x00_has_cap_flag(rt2x00dev, REQUIRE_BEACON_GUARD)) 704 return; 705 706 for (i = 0; i < queue->limit; i++) { 707 bcn_priv = queue->entries[i].priv_data; 708 usb_kill_urb(bcn_priv->guardian_urb); 709 usb_free_urb(bcn_priv->guardian_urb); 710 } 711 } 712 713 int rt2x00usb_initialize(struct rt2x00_dev *rt2x00dev) 714 { 715 struct data_queue *queue; 716 int status; 717 718 /* 719 * Find endpoints for each queue 720 */ 721 status = rt2x00usb_find_endpoints(rt2x00dev); 722 if (status) 723 goto exit; 724 725 /* 726 * Allocate DMA 727 */ 728 queue_for_each(rt2x00dev, queue) { 729 status = rt2x00usb_alloc_entries(queue); 730 if (status) 731 goto exit; 732 } 733 734 return 0; 735 736 exit: 737 rt2x00usb_uninitialize(rt2x00dev); 738 739 return status; 740 } 741 EXPORT_SYMBOL_GPL(rt2x00usb_initialize); 742 743 void rt2x00usb_uninitialize(struct rt2x00_dev *rt2x00dev) 744 { 745 struct data_queue *queue; 746 747 queue_for_each(rt2x00dev, queue) 748 rt2x00usb_free_entries(queue); 749 } 750 EXPORT_SYMBOL_GPL(rt2x00usb_uninitialize); 751 752 /* 753 * USB driver handlers. 754 */ 755 static void rt2x00usb_free_reg(struct rt2x00_dev *rt2x00dev) 756 { 757 kfree(rt2x00dev->rf); 758 rt2x00dev->rf = NULL; 759 760 kfree(rt2x00dev->eeprom); 761 rt2x00dev->eeprom = NULL; 762 763 kfree(rt2x00dev->csr.cache); 764 rt2x00dev->csr.cache = NULL; 765 } 766 767 static int rt2x00usb_alloc_reg(struct rt2x00_dev *rt2x00dev) 768 { 769 rt2x00dev->csr.cache = kzalloc(CSR_CACHE_SIZE, GFP_KERNEL); 770 if (!rt2x00dev->csr.cache) 771 goto exit; 772 773 rt2x00dev->eeprom = kzalloc(rt2x00dev->ops->eeprom_size, GFP_KERNEL); 774 if (!rt2x00dev->eeprom) 775 goto exit; 776 777 rt2x00dev->rf = kzalloc(rt2x00dev->ops->rf_size, GFP_KERNEL); 778 if (!rt2x00dev->rf) 779 goto exit; 780 781 return 0; 782 783 exit: 784 rt2x00_probe_err("Failed to allocate registers\n"); 785 786 rt2x00usb_free_reg(rt2x00dev); 787 788 return -ENOMEM; 789 } 790 791 int rt2x00usb_probe(struct usb_interface *usb_intf, 792 const struct rt2x00_ops *ops) 793 { 794 struct usb_device *usb_dev = interface_to_usbdev(usb_intf); 795 struct ieee80211_hw *hw; 796 struct rt2x00_dev *rt2x00dev; 797 int retval; 798 799 usb_dev = usb_get_dev(usb_dev); 800 usb_reset_device(usb_dev); 801 802 hw = ieee80211_alloc_hw(sizeof(struct rt2x00_dev), ops->hw); 803 if (!hw) { 804 rt2x00_probe_err("Failed to allocate hardware\n"); 805 retval = -ENOMEM; 806 goto exit_put_device; 807 } 808 809 usb_set_intfdata(usb_intf, hw); 810 811 rt2x00dev = hw->priv; 812 rt2x00dev->dev = &usb_intf->dev; 813 rt2x00dev->ops = ops; 814 rt2x00dev->hw = hw; 815 816 rt2x00_set_chip_intf(rt2x00dev, RT2X00_CHIP_INTF_USB); 817 818 INIT_WORK(&rt2x00dev->rxdone_work, rt2x00usb_work_rxdone); 819 INIT_WORK(&rt2x00dev->txdone_work, rt2x00usb_work_txdone); 820 hrtimer_init(&rt2x00dev->txstatus_timer, CLOCK_MONOTONIC, 821 HRTIMER_MODE_REL); 822 823 retval = rt2x00usb_alloc_reg(rt2x00dev); 824 if (retval) 825 goto exit_free_device; 826 827 retval = rt2x00lib_probe_dev(rt2x00dev); 828 if (retval) 829 goto exit_free_reg; 830 831 rt2x00dev->anchor = devm_kmalloc(&usb_dev->dev, 832 sizeof(struct usb_anchor), 833 GFP_KERNEL); 834 if (!rt2x00dev->anchor) 835 goto exit_free_reg; 836 837 init_usb_anchor(rt2x00dev->anchor); 838 return 0; 839 840 exit_free_reg: 841 rt2x00usb_free_reg(rt2x00dev); 842 843 exit_free_device: 844 ieee80211_free_hw(hw); 845 846 exit_put_device: 847 usb_put_dev(usb_dev); 848 849 usb_set_intfdata(usb_intf, NULL); 850 851 return retval; 852 } 853 EXPORT_SYMBOL_GPL(rt2x00usb_probe); 854 855 void rt2x00usb_disconnect(struct usb_interface *usb_intf) 856 { 857 struct ieee80211_hw *hw = usb_get_intfdata(usb_intf); 858 struct rt2x00_dev *rt2x00dev = hw->priv; 859 860 /* 861 * Free all allocated data. 862 */ 863 rt2x00lib_remove_dev(rt2x00dev); 864 rt2x00usb_free_reg(rt2x00dev); 865 ieee80211_free_hw(hw); 866 867 /* 868 * Free the USB device data. 869 */ 870 usb_set_intfdata(usb_intf, NULL); 871 usb_put_dev(interface_to_usbdev(usb_intf)); 872 } 873 EXPORT_SYMBOL_GPL(rt2x00usb_disconnect); 874 875 #ifdef CONFIG_PM 876 int rt2x00usb_suspend(struct usb_interface *usb_intf, pm_message_t state) 877 { 878 struct ieee80211_hw *hw = usb_get_intfdata(usb_intf); 879 struct rt2x00_dev *rt2x00dev = hw->priv; 880 881 return rt2x00lib_suspend(rt2x00dev, state); 882 } 883 EXPORT_SYMBOL_GPL(rt2x00usb_suspend); 884 885 int rt2x00usb_resume(struct usb_interface *usb_intf) 886 { 887 struct ieee80211_hw *hw = usb_get_intfdata(usb_intf); 888 struct rt2x00_dev *rt2x00dev = hw->priv; 889 890 return rt2x00lib_resume(rt2x00dev); 891 } 892 EXPORT_SYMBOL_GPL(rt2x00usb_resume); 893 #endif /* CONFIG_PM */ 894 895 /* 896 * rt2x00usb module information. 897 */ 898 MODULE_AUTHOR(DRV_PROJECT); 899 MODULE_VERSION(DRV_VERSION); 900 MODULE_DESCRIPTION("rt2x00 usb library"); 901 MODULE_LICENSE("GPL"); 902