drivers/net/wireless/ath/ar9170/usb.c

   1 /*
   2  * Atheros AR9170 driver
   3  *
   4  * USB - frontend
   5  *
   6  * Copyright 2008, Johannes Berg <johannes@sipsolutions.net>
   7  * Copyright 2009, Christian Lamparter <chunkeey@web.de>
   8  *
   9  * This program is free software; you can redistribute it and/or modify
  10  * it under the terms of the GNU General Public License as published by
  11  * the Free Software Foundation; either version 2 of the License, or
  12  * (at your option) any later version.
  13  *
  14  * This program is distributed in the hope that it will be useful,
  15  * but WITHOUT ANY WARRANTY; without even the implied warranty of
  16  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  17  * GNU General Public License for more details.
  18  *
  19  * You should have received a copy of the GNU General Public License
  20  * along with this program; see the file COPYING.  If not, see
  21  * http://www.gnu.org/licenses/.
  22  *
  23  * This file incorporates work covered by the following copyright and
  24  * permission notice:
  25  *    Copyright (c) 2007-2008 Atheros Communications, Inc.
  26  *
  27  *    Permission to use, copy, modify, and/or distribute this software for any
  28  *    purpose with or without fee is hereby granted, provided that the above
  29  *    copyright notice and this permission notice appear in all copies.
  30  *
  31  *    THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL WARRANTIES
  32  *    WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF
  33  *    MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR
  34  *    ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES
  35  *    WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN
  36  *    ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF
  37  *    OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
  38  */
  39
  40 #include <linux/module.h>
  41 #include <linux/usb.h>
  42 #include <linux/firmware.h>
  43 #include <linux/etherdevice.h>
  44 #include <net/mac80211.h>
  45 #include "ar9170.h"
  46 #include "cmd.h"
  47 #include "hw.h"
  48 #include "usb.h"
  49
  50 MODULE_AUTHOR("Johannes Berg <johannes@sipsolutions.net>");
  51 MODULE_AUTHOR("Christian Lamparter <chunkeey@web.de>");
  52 MODULE_LICENSE("GPL");
  53 MODULE_DESCRIPTION("Atheros AR9170 802.11n USB wireless");
  54 MODULE_FIRMWARE("ar9170.fw");
  55 MODULE_FIRMWARE("ar9170-1.fw");
  56 MODULE_FIRMWARE("ar9170-2.fw");
  57
  58 enum ar9170_requirements {
  59         AR9170_REQ_FW1_ONLY = 1,
  60 };
  61
  62 static struct usb_device_id ar9170_usb_ids[] = {
  63         /* Atheros 9170 */
  64         { USB_DEVICE(0x0cf3, 0x9170) },
  65         /* Atheros TG121N */
  66         { USB_DEVICE(0x0cf3, 0x1001) },
  67         /* TP-Link TL-WN821N v2 */
  68         { USB_DEVICE(0x0cf3, 0x1002) },
  69         /* Cace Airpcap NX */
  70         { USB_DEVICE(0xcace, 0x0300) },
  71         /* D-Link DWA 160 A1 */
  72         { USB_DEVICE(0x07d1, 0x3c10) },
  73         /* D-Link DWA 160 A2 */
  74         { USB_DEVICE(0x07d1, 0x3a09) },
  75         /* Netgear WNDA3100 */
  76         { USB_DEVICE(0x0846, 0x9010) },
  77         /* Netgear WN111 v2 */
  78         { USB_DEVICE(0x0846, 0x9001) },
  79         /* Zydas ZD1221 */
  80         { USB_DEVICE(0x0ace, 0x1221) },
  81         /* ZyXEL NWD271N */
  82         { USB_DEVICE(0x0586, 0x3417) },
  83         /* Z-Com UB81 BG */
  84         { USB_DEVICE(0x0cde, 0x0023) },
  85         /* Z-Com UB82 ABG */
  86         { USB_DEVICE(0x0cde, 0x0026) },
  87         /* Sphairon Homelink 1202 */
  88         { USB_DEVICE(0x0cde, 0x0027) },
  89         /* Arcadyan WN7512 */
  90         { USB_DEVICE(0x083a, 0xf522) },
  91         /* Planex GWUS300 */
  92         { USB_DEVICE(0x2019, 0x5304) },
  93         /* IO-Data WNGDNUS2 */
  94         { USB_DEVICE(0x04bb, 0x093f) },
  95         /* AVM FRITZ!WLAN USB Stick N */
  96         { USB_DEVICE(0x057C, 0x8401) },
  97         /* NEC WL300NU-G */
  98         { USB_DEVICE(0x0409, 0x0249) },
  99         /* AVM FRITZ!WLAN USB Stick N 2.4 */
 100         { USB_DEVICE(0x057C, 0x8402), .driver_info = AR9170_REQ_FW1_ONLY },
 101
 102         /* terminate */
 103         {}
 104 };
 105 MODULE_DEVICE_TABLE(usb, ar9170_usb_ids);
 106
 107 static void ar9170_usb_submit_urb(struct ar9170_usb *aru)
 108 {
 109         struct urb *urb;
 110         unsigned long flags;
 111         int err;
 112
 113         if (unlikely(!IS_STARTED(&aru->common)))
 114                 return ;
 115
 116         spin_lock_irqsave(&aru->tx_urb_lock, flags);
 117         if (atomic_read(&aru->tx_submitted_urbs) >= AR9170_NUM_TX_URBS) {
 118                 spin_unlock_irqrestore(&aru->tx_urb_lock, flags);
 119                 return ;
 120         }
 121         atomic_inc(&aru->tx_submitted_urbs);
 122
 123         urb = usb_get_from_anchor(&aru->tx_pending);
 124         if (!urb) {
 125                 atomic_dec(&aru->tx_submitted_urbs);
 126                 spin_unlock_irqrestore(&aru->tx_urb_lock, flags);
 127
 128                 return ;
 129         }
 130         spin_unlock_irqrestore(&aru->tx_urb_lock, flags);
 131
 132         aru->tx_pending_urbs--;
 133         usb_anchor_urb(urb, &aru->tx_submitted);
 134
 135         err = usb_submit_urb(urb, GFP_ATOMIC);
 136         if (unlikely(err)) {
 137                 if (ar9170_nag_limiter(&aru->common))
 138                         dev_err(&aru->udev->dev, "submit_urb failed (%d).\n",
 139                                 err);
 140
 141                 usb_unanchor_urb(urb);
 142                 atomic_dec(&aru->tx_submitted_urbs);
 143                 ar9170_tx_callback(&aru->common, urb->context);
 144         }
 145
 146         usb_free_urb(urb);
 147 }
 148
 149 static void ar9170_usb_tx_urb_complete_frame(struct urb *urb)
 150 {
 151         struct sk_buff *skb = urb->context;
 152         struct ar9170_usb *aru = (struct ar9170_usb *)
 153               usb_get_intfdata(usb_ifnum_to_if(urb->dev, 0));
 154
 155         if (unlikely(!aru)) {
 156                 dev_kfree_skb_irq(skb);
 157                 return ;
 158         }
 159
 160         atomic_dec(&aru->tx_submitted_urbs);
 161
 162         ar9170_tx_callback(&aru->common, skb);
 163
 164         ar9170_usb_submit_urb(aru);
 165 }
 166
 167 static void ar9170_usb_tx_urb_complete(struct urb *urb)
 168 {
 169 }
 170
 171 static void ar9170_usb_irq_completed(struct urb *urb)
 172 {
 173         struct ar9170_usb *aru = urb->context;
 174
 175         switch (urb->status) {
 176         /* everything is fine */
 177         case 0:
 178                 break;
 179
 180         /* disconnect */
 181         case -ENOENT:
 182         case -ECONNRESET:
 183         case -ENODEV:
 184         case -ESHUTDOWN:
 185                 goto free;
 186
 187         default:
 188                 goto resubmit;
 189         }
 190
 191         ar9170_handle_command_response(&aru->common, urb->transfer_buffer,
 192                                        urb->actual_length);
 193
 194 resubmit:
 195         usb_anchor_urb(urb, &aru->rx_submitted);
 196         if (usb_submit_urb(urb, GFP_ATOMIC)) {
 197                 usb_unanchor_urb(urb);
 198                 goto free;
 199         }
 200
 201         return;
 202
 203 free:
 204         usb_buffer_free(aru->udev, 64, urb->transfer_buffer, urb->transfer_dma);
 205 }
 206
 207 static void ar9170_usb_rx_completed(struct urb *urb)
 208 {
 209         struct sk_buff *skb = urb->context;
 210         struct ar9170_usb *aru = (struct ar9170_usb *)
 211                 usb_get_intfdata(usb_ifnum_to_if(urb->dev, 0));
 212         int err;
 213
 214         if (!aru)
 215                 goto free;
 216
 217         switch (urb->status) {
 218         /* everything is fine */
 219         case 0:
 220                 break;
 221
 222         /* disconnect */
 223         case -ENOENT:
 224         case -ECONNRESET:
 225         case -ENODEV:
 226         case -ESHUTDOWN:
 227                 goto free;
 228
 229         default:
 230                 goto resubmit;
 231         }
 232
 233         skb_put(skb, urb->actual_length);
 234         ar9170_rx(&aru->common, skb);
 235
 236 resubmit:
 237         skb_reset_tail_pointer(skb);
 238         skb_trim(skb, 0);
 239
 240         usb_anchor_urb(urb, &aru->rx_submitted);
 241         err = usb_submit_urb(urb, GFP_ATOMIC);
 242         if (unlikely(err)) {
 243                 usb_unanchor_urb(urb);
 244                 goto free;
 245         }
 246
 247         return ;
 248
 249 free:
 250         dev_kfree_skb_irq(skb);
 251 }
 252
 253 static int ar9170_usb_prep_rx_urb(struct ar9170_usb *aru,
 254                                   struct urb *urb, gfp_t gfp)
 255 {
 256         struct sk_buff *skb;
 257
 258         skb = __dev_alloc_skb(AR9170_MAX_RX_BUFFER_SIZE + 32, gfp);
 259         if (!skb)
 260                 return -ENOMEM;
 261
 262         /* reserve some space for mac80211's radiotap */
 263         skb_reserve(skb, 32);
 264
 265         usb_fill_bulk_urb(urb, aru->udev,
 266                           usb_rcvbulkpipe(aru->udev, AR9170_EP_RX),
 267                           skb->data, min(skb_tailroom(skb),
 268                           AR9170_MAX_RX_BUFFER_SIZE),
 269                           ar9170_usb_rx_completed, skb);
 270
 271         return 0;
 272 }
 273
 274 static int ar9170_usb_alloc_rx_irq_urb(struct ar9170_usb *aru)
 275 {
 276         struct urb *urb = NULL;
 277         void *ibuf;
 278         int err = -ENOMEM;
 279
 280         /* initialize interrupt endpoint */
 281         urb = usb_alloc_urb(0, GFP_KERNEL);
 282         if (!urb)
 283                 goto out;
 284
 285         ibuf = usb_buffer_alloc(aru->udev, 64, GFP_KERNEL, &urb->transfer_dma);
 286         if (!ibuf)
 287                 goto out;
 288
 289         usb_fill_int_urb(urb, aru->udev,
 290                          usb_rcvintpipe(aru->udev, AR9170_EP_IRQ), ibuf,
 291                          64, ar9170_usb_irq_completed, aru, 1);
 292         urb->transfer_flags |= URB_NO_TRANSFER_DMA_MAP;
 293
 294         usb_anchor_urb(urb, &aru->rx_submitted);
 295         err = usb_submit_urb(urb, GFP_KERNEL);
 296         if (err) {
 297                 usb_unanchor_urb(urb);
 298                 usb_buffer_free(aru->udev, 64, urb->transfer_buffer,
 299                                 urb->transfer_dma);
 300         }
 301
 302 out:
 303         usb_free_urb(urb);
 304         return err;
 305 }
 306
 307 static int ar9170_usb_alloc_rx_bulk_urbs(struct ar9170_usb *aru)
 308 {
 309         struct urb *urb;
 310         int i;
 311         int err = -EINVAL;
 312
 313         for (i = 0; i < AR9170_NUM_RX_URBS; i++) {
 314                 err = -ENOMEM;
 315                 urb = usb_alloc_urb(0, GFP_KERNEL);
 316                 if (!urb)
 317                         goto err_out;
 318
 319                 err = ar9170_usb_prep_rx_urb(aru, urb, GFP_KERNEL);
 320                 if (err) {
 321                         usb_free_urb(urb);
 322                         goto err_out;
 323                 }
 324
 325                 usb_anchor_urb(urb, &aru->rx_submitted);
 326                 err = usb_submit_urb(urb, GFP_KERNEL);
 327                 if (err) {
 328                         usb_unanchor_urb(urb);
 329                         dev_kfree_skb_any((void *) urb->transfer_buffer);
 330                         usb_free_urb(urb);
 331                         goto err_out;
 332                 }
 333                 usb_free_urb(urb);
 334         }
 335
 336         /* the device now waiting for a firmware. */
 337         aru->common.state = AR9170_IDLE;
 338         return 0;
 339
 340 err_out:
 341
 342         usb_kill_anchored_urbs(&aru->rx_submitted);
 343         return err;
 344 }
 345
 346 static int ar9170_usb_flush(struct ar9170 *ar)
 347 {
 348         struct ar9170_usb *aru = (void *) ar;
 349         struct urb *urb;
 350         int ret, err = 0;
 351
 352         if (IS_STARTED(ar))
 353                 aru->common.state = AR9170_IDLE;
 354
 355         usb_wait_anchor_empty_timeout(&aru->tx_pending,
 356                                             msecs_to_jiffies(800));
 357         while ((urb = usb_get_from_anchor(&aru->tx_pending))) {
 358                 ar9170_tx_callback(&aru->common, (void *) urb->context);
 359                 usb_free_urb(urb);
 360         }
 361
 362         /* lets wait a while until the tx - queues are dried out */
 363         ret = usb_wait_anchor_empty_timeout(&aru->tx_submitted,
 364                                             msecs_to_jiffies(100));
 365         if (ret == 0)
 366                 err = -ETIMEDOUT;
 367
 368         usb_kill_anchored_urbs(&aru->tx_submitted);
 369
 370         if (IS_ACCEPTING_CMD(ar))
 371                 aru->common.state = AR9170_STARTED;
 372
 373         return err;
 374 }
 375
 376 static void ar9170_usb_cancel_urbs(struct ar9170_usb *aru)
 377 {
 378         int err;
 379
 380         aru->common.state = AR9170_UNKNOWN_STATE;
 381
 382         err = ar9170_usb_flush(&aru->common);
 383         if (err)
 384                 dev_err(&aru->udev->dev, "stuck tx urbs!\n");
 385
 386         usb_poison_anchored_urbs(&aru->tx_submitted);
 387         usb_poison_anchored_urbs(&aru->rx_submitted);
 388 }
 389
 390 static int ar9170_usb_exec_cmd(struct ar9170 *ar, enum ar9170_cmd cmd,
 391                                unsigned int plen, void *payload,
 392                                unsigned int outlen, void *out)
 393 {
 394         struct ar9170_usb *aru = (void *) ar;
 395         struct urb *urb = NULL;
 396         unsigned long flags;
 397         int err = -ENOMEM;
 398
 399         if (unlikely(!IS_ACCEPTING_CMD(ar)))
 400                 return -EPERM;
 401
 402         if (WARN_ON(plen > AR9170_MAX_CMD_LEN - 4))
 403                 return -EINVAL;
 404
 405         urb = usb_alloc_urb(0, GFP_ATOMIC);
 406         if (unlikely(!urb))
 407                 goto err_free;
 408
 409         ar->cmdbuf[0] = cpu_to_le32(plen);
 410         ar->cmdbuf[0] |= cpu_to_le32(cmd << 8);
 411         /* writing multiple regs fills this buffer already */
 412         if (plen && payload != (u8 *)(&ar->cmdbuf[1]))
 413                 memcpy(&ar->cmdbuf[1], payload, plen);
 414
 415         spin_lock_irqsave(&aru->common.cmdlock, flags);
 416         aru->readbuf = (u8 *)out;
 417         aru->readlen = outlen;
 418         spin_unlock_irqrestore(&aru->common.cmdlock, flags);
 419
 420         usb_fill_int_urb(urb, aru->udev,
 421                          usb_sndintpipe(aru->udev, AR9170_EP_CMD),
 422                          aru->common.cmdbuf, plen + 4,
 423                          ar9170_usb_tx_urb_complete, NULL, 1);
 424
 425         usb_anchor_urb(urb, &aru->tx_submitted);
 426         err = usb_submit_urb(urb, GFP_ATOMIC);
 427         if (unlikely(err)) {
 428                 usb_unanchor_urb(urb);
 429                 usb_free_urb(urb);
 430                 goto err_unbuf;
 431         }
 432         usb_free_urb(urb);
 433
 434         err = wait_for_completion_timeout(&aru->cmd_wait, HZ);
 435         if (err == 0) {
 436                 err = -ETIMEDOUT;
 437                 goto err_unbuf;
 438         }
 439
 440         if (aru->readlen != outlen) {
 441                 err = -EMSGSIZE;
 442                 goto err_unbuf;
 443         }
 444
 445         return 0;
 446
 447 err_unbuf:
 448         /* Maybe the device was removed in the second we were waiting? */
 449         if (IS_STARTED(ar)) {
 450                 dev_err(&aru->udev->dev, "no command feedback "
 451                                          "received (%d).\n", err);
 452
 453                 /* provide some maybe useful debug information */
 454                 print_hex_dump_bytes("ar9170 cmd: ", DUMP_PREFIX_NONE,
 455                                      aru->common.cmdbuf, plen + 4);
 456                 dump_stack();
 457         }
 458
 459         /* invalidate to avoid completing the next prematurely */
 460         spin_lock_irqsave(&aru->common.cmdlock, flags);
 461         aru->readbuf = NULL;
 462         aru->readlen = 0;
 463         spin_unlock_irqrestore(&aru->common.cmdlock, flags);
 464
 465 err_free:
 466
 467         return err;
 468 }
 469
 470 static int ar9170_usb_tx(struct ar9170 *ar, struct sk_buff *skb)
 471 {
 472         struct ar9170_usb *aru = (struct ar9170_usb *) ar;
 473         struct urb *urb;
 474
 475         if (unlikely(!IS_STARTED(ar))) {
 476                 /* Seriously, what were you drink... err... thinking!? */
 477                 return -EPERM;
 478         }
 479
 480         urb = usb_alloc_urb(0, GFP_ATOMIC);
 481         if (unlikely(!urb))
 482                 return -ENOMEM;
 483
 484         usb_fill_bulk_urb(urb, aru->udev,
 485                           usb_sndbulkpipe(aru->udev, AR9170_EP_TX),
 486                           skb->data, skb->len,
 487                           ar9170_usb_tx_urb_complete_frame, skb);
 488         urb->transfer_flags |= URB_ZERO_PACKET;
 489
 490         usb_anchor_urb(urb, &aru->tx_pending);
 491         aru->tx_pending_urbs++;
 492
 493         usb_free_urb(urb);
 494
 495         ar9170_usb_submit_urb(aru);
 496         return 0;
 497 }
 498
 499 static void ar9170_usb_callback_cmd(struct ar9170 *ar, u32 len , void *buffer)
 500 {
 501         struct ar9170_usb *aru = (void *) ar;
 502         unsigned long flags;
 503         u32 in, out;
 504
 505         if (unlikely(!buffer))
 506                 return ;
 507
 508         in = le32_to_cpup((__le32 *)buffer);
 509         out = le32_to_cpu(ar->cmdbuf[0]);
 510
 511         /* mask off length byte */
 512         out &= ~0xFF;
 513
 514         if (aru->readlen >= 0) {
 515                 /* add expected length */
 516                 out |= aru->readlen;
 517         } else {
 518                 /* add obtained length */
 519                 out |= in & 0xFF;
 520         }
 521
 522         /*
 523          * Some commands (e.g: AR9170_CMD_FREQUENCY) have a variable response
 524          * length and we cannot predict the correct length in advance.
 525          * So we only check if we provided enough space for the data.
 526          */
 527         if (unlikely(out < in)) {
 528                 dev_warn(&aru->udev->dev, "received invalid command response "
 529                                           "got %d bytes, instead of %d bytes "
 530                                           "and the resp length is %d bytes\n",
 531                          in, out, len);
 532                 print_hex_dump_bytes("ar9170 invalid resp: ",
 533                                      DUMP_PREFIX_OFFSET, buffer, len);
 534                 /*
 535                  * Do not complete, then the command times out,
 536                  * and we get a stack trace from there.
 537                  */
 538                 return ;
 539         }
 540
 541         spin_lock_irqsave(&aru->common.cmdlock, flags);
 542         if (aru->readbuf && len > 0) {
 543                 memcpy(aru->readbuf, buffer + 4, len - 4);
 544                 aru->readbuf = NULL;
 545         }
 546         complete(&aru->cmd_wait);
 547         spin_unlock_irqrestore(&aru->common.cmdlock, flags);
 548 }
 549
 550 static int ar9170_usb_upload(struct ar9170_usb *aru, const void *data,
 551                              size_t len, u32 addr, bool complete)
 552 {
 553         int transfer, err;
 554         u8 *buf = kmalloc(4096, GFP_KERNEL);
 555
 556         if (!buf)
 557                 return -ENOMEM;
 558
 559         while (len) {
 560                 transfer = min_t(int, len, 4096);
 561                 memcpy(buf, data, transfer);
 562
 563                 err = usb_control_msg(aru->udev, usb_sndctrlpipe(aru->udev, 0),
 564                                       0x30 /* FW DL */, 0x40 | USB_DIR_OUT,
 565                                       addr >> 8, 0, buf, transfer, 1000);
 566
 567                 if (err < 0) {
 568                         kfree(buf);
 569                         return err;
 570                 }
 571
 572                 len -= transfer;
 573                 data += transfer;
 574                 addr += transfer;
 575         }
 576         kfree(buf);
 577
 578         if (complete) {
 579                 err = usb_control_msg(aru->udev, usb_sndctrlpipe(aru->udev, 0),
 580                                       0x31 /* FW DL COMPLETE */,
 581                                       0x40 | USB_DIR_OUT, 0, 0, NULL, 0, 5000);
 582         }
 583
 584         return 0;
 585 }
 586
 587 static int ar9170_usb_reset(struct ar9170_usb *aru)
 588 {
 589         int ret, lock = (aru->intf->condition != USB_INTERFACE_BINDING);
 590
 591         if (lock) {
 592                 ret = usb_lock_device_for_reset(aru->udev, aru->intf);
 593                 if (ret < 0) {
 594                         dev_err(&aru->udev->dev, "unable to lock device "
 595                                 "for reset (%d).\n", ret);
 596                         return ret;
 597                 }
 598         }
 599
 600         ret = usb_reset_device(aru->udev);
 601         if (lock)
 602                 usb_unlock_device(aru->udev);
 603
 604         /* let it rest - for a second - */
 605         msleep(1000);
 606
 607         return ret;
 608 }
 609
 610 static int ar9170_usb_upload_firmware(struct ar9170_usb *aru)
 611 {
 612         int err;
 613
 614         if (!aru->init_values)
 615                 goto upload_fw_start;
 616
 617         /* First, upload initial values to device RAM */
 618         err = ar9170_usb_upload(aru, aru->init_values->data,
 619                                 aru->init_values->size, 0x102800, false);
 620         if (err) {
 621                 dev_err(&aru->udev->dev, "firmware part 1 "
 622                         "upload failed (%d).\n", err);
 623                 return err;
 624         }
 625
 626 upload_fw_start:
 627
 628         /* Then, upload the firmware itself and start it */
 629         return ar9170_usb_upload(aru, aru->firmware->data, aru->firmware->size,
 630                                 0x200000, true);
 631 }
 632
 633 static int ar9170_usb_init_transport(struct ar9170_usb *aru)
 634 {
 635         struct ar9170 *ar = (void *) &aru->common;
 636         int err;
 637
 638         ar9170_regwrite_begin(ar);
 639
 640         /* Set USB Rx stream mode MAX packet number to 2 */
 641         ar9170_regwrite(AR9170_USB_REG_MAX_AGG_UPLOAD, 0x4);
 642
 643         /* Set USB Rx stream mode timeout to 10us */
 644         ar9170_regwrite(AR9170_USB_REG_UPLOAD_TIME_CTL, 0x80);
 645
 646         ar9170_regwrite_finish();
 647
 648         err = ar9170_regwrite_result();
 649         if (err)
 650                 dev_err(&aru->udev->dev, "USB setup failed (%d).\n", err);
 651
 652         return err;
 653 }
 654
 655 static void ar9170_usb_stop(struct ar9170 *ar)
 656 {
 657         struct ar9170_usb *aru = (void *) ar;
 658         int ret;
 659
 660         if (IS_ACCEPTING_CMD(ar))
 661                 aru->common.state = AR9170_STOPPED;
 662
 663         ret = ar9170_usb_flush(ar);
 664         if (ret)
 665                 dev_err(&aru->udev->dev, "kill pending tx urbs.\n");
 666
 667         usb_poison_anchored_urbs(&aru->tx_submitted);
 668
 669         /*
 670          * Note:
 671          * So far we freed all tx urbs, but we won't dare to touch any rx urbs.
 672          * Else we would end up with a unresponsive device...
 673          */
 674 }
 675
 676 static int ar9170_usb_open(struct ar9170 *ar)
 677 {
 678         struct ar9170_usb *aru = (void *) ar;
 679         int err;
 680
 681         usb_unpoison_anchored_urbs(&aru->tx_submitted);
 682         err = ar9170_usb_init_transport(aru);
 683         if (err) {
 684                 usb_poison_anchored_urbs(&aru->tx_submitted);
 685                 return err;
 686         }
 687
 688         aru->common.state = AR9170_IDLE;
 689         return 0;
 690 }
 691
 692 static int ar9170_usb_init_device(struct ar9170_usb *aru)
 693 {
 694         int err;
 695
 696         err = ar9170_usb_alloc_rx_irq_urb(aru);
 697         if (err)
 698                 goto err_out;
 699
 700         err = ar9170_usb_alloc_rx_bulk_urbs(aru);
 701         if (err)
 702                 goto err_unrx;
 703
 704         err = ar9170_usb_upload_firmware(aru);
 705         if (err) {
 706                 err = ar9170_echo_test(&aru->common, 0x60d43110);
 707                 if (err) {
 708                         /* force user invention, by disabling the device */
 709                         err = usb_driver_set_configuration(aru->udev, -1);
 710                         dev_err(&aru->udev->dev, "device is in a bad state. "
 711                                                  "please reconnect it!\n");
 712                         goto err_unrx;
 713                 }
 714         }
 715
 716         return 0;
 717
 718 err_unrx:
 719         ar9170_usb_cancel_urbs(aru);
 720
 721 err_out:
 722         return err;
 723 }
 724
 725 static void ar9170_usb_firmware_failed(struct ar9170_usb *aru)
 726 {
 727         struct device *parent = aru->udev->dev.parent;
 728
 729         complete(&aru->firmware_loading_complete);
 730
 731         /* unbind anything failed */
 732         if (parent)
 733                 down(&parent->sem);
 734         device_release_driver(&aru->udev->dev);
 735         if (parent)
 736                 up(&parent->sem);
 737
 738         usb_put_dev(aru->udev);
 739 }
 740
 741 static void ar9170_usb_firmware_finish(const struct firmware *fw, void *context)
 742 {
 743         struct ar9170_usb *aru = context;
 744         int err;
 745
 746         aru->firmware = fw;
 747
 748         if (!fw) {
 749                 dev_err(&aru->udev->dev, "firmware file not found.\n");
 750                 goto err_freefw;
 751         }
 752
 753         err = ar9170_usb_init_device(aru);
 754         if (err)
 755                 goto err_freefw;
 756
 757         err = ar9170_usb_open(&aru->common);
 758         if (err)
 759                 goto err_unrx;
 760
 761         err = ar9170_register(&aru->common, &aru->udev->dev);
 762
 763         ar9170_usb_stop(&aru->common);
 764         if (err)
 765                 goto err_unrx;
 766
 767         complete(&aru->firmware_loading_complete);
 768         usb_put_dev(aru->udev);
 769         return;
 770
 771  err_unrx:
 772         ar9170_usb_cancel_urbs(aru);
 773
 774  err_freefw:
 775         ar9170_usb_firmware_failed(aru);
 776 }
 777
 778 static void ar9170_usb_firmware_inits(const struct firmware *fw,
 779                                       void *context)
 780 {
 781         struct ar9170_usb *aru = context;
 782         int err;
 783
 784         if (!fw) {
 785                 dev_err(&aru->udev->dev, "file with init values not found.\n");
 786                 ar9170_usb_firmware_failed(aru);
 787                 return;
 788         }
 789
 790         aru->init_values = fw;
 791
 792         /* ok so we have the init values -- get code for two-stage */
 793
 794         err = request_firmware_nowait(THIS_MODULE, 1, "ar9170-2.fw",
 795                                       &aru->udev->dev, GFP_KERNEL, aru,
 796                                       ar9170_usb_firmware_finish);
 797         if (err)
 798                 ar9170_usb_firmware_failed(aru);
 799 }
 800
 801 static void ar9170_usb_firmware_step2(const struct firmware *fw, void *context)
 802 {
 803         struct ar9170_usb *aru = context;
 804         int err;
 805
 806         if (fw) {
 807                 ar9170_usb_firmware_finish(fw, context);
 808                 return;
 809         }
 810
 811         if (aru->req_one_stage_fw) {
 812                 dev_err(&aru->udev->dev, "ar9170.fw firmware file "
 813                         "not found and is required for this device\n");
 814                 ar9170_usb_firmware_failed(aru);
 815                 return;
 816         }
 817
 818         dev_err(&aru->udev->dev, "ar9170.fw firmware file "
 819                 "not found, trying old firmware...\n");
 820
 821         err = request_firmware_nowait(THIS_MODULE, 1, "ar9170-1.fw",
 822                                       &aru->udev->dev, GFP_KERNEL, aru,
 823                                       ar9170_usb_firmware_inits);
 824         if (err)
 825                 ar9170_usb_firmware_failed(aru);
 826 }
 827
 828 static bool ar9170_requires_one_stage(const struct usb_device_id *id)
 829 {
 830         if (!id->driver_info)
 831                 return false;
 832         if (id->driver_info == AR9170_REQ_FW1_ONLY)
 833                 return true;
 834         return false;
 835 }
 836
 837 static int ar9170_usb_probe(struct usb_interface *intf,
 838                         const struct usb_device_id *id)
 839 {
 840         struct ar9170_usb *aru;
 841         struct ar9170 *ar;
 842         struct usb_device *udev;
 843         int err;
 844
 845         aru = ar9170_alloc(sizeof(*aru));
 846         if (IS_ERR(aru)) {
 847                 err = PTR_ERR(aru);
 848                 goto out;
 849         }
 850
 851         udev = interface_to_usbdev(intf);
 852         usb_get_dev(udev);
 853         aru->udev = udev;
 854         aru->intf = intf;
 855         ar = &aru->common;
 856
 857         aru->req_one_stage_fw = ar9170_requires_one_stage(id);
 858
 859         usb_set_intfdata(intf, aru);
 860         SET_IEEE80211_DEV(ar->hw, &intf->dev);
 861
 862         init_usb_anchor(&aru->rx_submitted);
 863         init_usb_anchor(&aru->tx_pending);
 864         init_usb_anchor(&aru->tx_submitted);
 865         init_completion(&aru->cmd_wait);
 866         init_completion(&aru->firmware_loading_complete);
 867         spin_lock_init(&aru->tx_urb_lock);
 868
 869         aru->tx_pending_urbs = 0;
 870         atomic_set(&aru->tx_submitted_urbs, 0);
 871
 872         aru->common.stop = ar9170_usb_stop;
 873         aru->common.flush = ar9170_usb_flush;
 874         aru->common.open = ar9170_usb_open;
 875         aru->common.tx = ar9170_usb_tx;
 876         aru->common.exec_cmd = ar9170_usb_exec_cmd;
 877         aru->common.callback_cmd = ar9170_usb_callback_cmd;
 878
 879 #ifdef CONFIG_PM
 880         udev->reset_resume = 1;
 881 #endif /* CONFIG_PM */
 882         err = ar9170_usb_reset(aru);
 883         if (err)
 884                 goto err_freehw;
 885
 886         usb_get_dev(aru->udev);
 887         return request_firmware_nowait(THIS_MODULE, 1, "ar9170.fw",
 888                                        &aru->udev->dev, GFP_KERNEL, aru,
 889                                        ar9170_usb_firmware_step2);
 890 err_freehw:
 891         usb_set_intfdata(intf, NULL);
 892         usb_put_dev(udev);
 893         ieee80211_free_hw(ar->hw);
 894 out:
 895         return err;
 896 }
 897
 898 static void ar9170_usb_disconnect(struct usb_interface *intf)
 899 {
 900         struct ar9170_usb *aru = usb_get_intfdata(intf);
 901
 902         if (!aru)
 903                 return;
 904
 905         aru->common.state = AR9170_IDLE;
 906
 907         wait_for_completion(&aru->firmware_loading_complete);
 908
 909         ar9170_unregister(&aru->common);
 910         ar9170_usb_cancel_urbs(aru);
 911
 912         usb_put_dev(aru->udev);
 913         usb_set_intfdata(intf, NULL);
 914         ieee80211_free_hw(aru->common.hw);
 915
 916         release_firmware(aru->init_values);
 917         release_firmware(aru->firmware);
 918 }
 919
 920 #ifdef CONFIG_PM
 921 static int ar9170_suspend(struct usb_interface *intf,
 922                           pm_message_t  message)
 923 {
 924         struct ar9170_usb *aru = usb_get_intfdata(intf);
 925
 926         if (!aru)
 927                 return -ENODEV;
 928
 929         aru->common.state = AR9170_IDLE;
 930         ar9170_usb_cancel_urbs(aru);
 931
 932         return 0;
 933 }
 934
 935 static int ar9170_resume(struct usb_interface *intf)
 936 {
 937         struct ar9170_usb *aru = usb_get_intfdata(intf);
 938         int err;
 939
 940         if (!aru)
 941                 return -ENODEV;
 942
 943         usb_unpoison_anchored_urbs(&aru->rx_submitted);
 944         usb_unpoison_anchored_urbs(&aru->tx_submitted);
 945
 946         err = ar9170_usb_init_device(aru);
 947         if (err)
 948                 goto err_unrx;
 949
 950         err = ar9170_usb_open(&aru->common);
 951         if (err)
 952                 goto err_unrx;
 953
 954         return 0;
 955
 956 err_unrx:
 957         aru->common.state = AR9170_IDLE;
 958         ar9170_usb_cancel_urbs(aru);
 959
 960         return err;
 961 }
 962 #endif /* CONFIG_PM */
 963
 964 static struct usb_driver ar9170_driver = {
 965         .name = "ar9170usb",
 966         .probe = ar9170_usb_probe,
 967         .disconnect = ar9170_usb_disconnect,
 968         .id_table = ar9170_usb_ids,
 969         .soft_unbind = 1,
 970 #ifdef CONFIG_PM
 971         .suspend = ar9170_suspend,
 972         .resume = ar9170_resume,
 973         .reset_resume = ar9170_resume,
 974 #endif /* CONFIG_PM */
 975 };
 976
 977 static int __init ar9170_init(void)
 978 {
 979         return usb_register(&ar9170_driver);
 980 }
 981
 982 static void __exit ar9170_exit(void)
 983 {
 984         usb_deregister(&ar9170_driver);
 985 }
 986
 987 module_init(ar9170_init);
 988 module_exit(ar9170_exit);