drivers/net/wireless/ath/ath9k/hif_usb.c

   1 /*
   2  * Copyright (c) 2010-2011 Atheros Communications Inc.
   3  *
   4  * Permission to use, copy, modify, and/or distribute this software for any
   5  * purpose with or without fee is hereby granted, provided that the above
   6  * copyright notice and this permission notice appear in all copies.
   7  *
   8  * THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL WARRANTIES
   9  * WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF
  10  * MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR
  11  * ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES
  12  * WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN
  13  * ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF
  14  * OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
  15  */
  16
  17 #include <asm/unaligned.h>
  18 #include "htc.h"
  19
  20 /* identify firmware images */
  21 #define FIRMWARE_AR7010_1_1     "htc_7010.fw"
  22 #define FIRMWARE_AR9271         "htc_9271.fw"
  23
  24 MODULE_FIRMWARE(FIRMWARE_AR7010_1_1);
  25 MODULE_FIRMWARE(FIRMWARE_AR9271);
  26
  27 static struct usb_device_id ath9k_hif_usb_ids[] = {
  28         { USB_DEVICE(0x0cf3, 0x9271) }, /* Atheros */
  29         { USB_DEVICE(0x0cf3, 0x1006) }, /* Atheros */
  30         { USB_DEVICE(0x0846, 0x9030) }, /* Netgear N150 */
  31         { USB_DEVICE(0x07D1, 0x3A10) }, /* Dlink Wireless 150 */
  32         { USB_DEVICE(0x13D3, 0x3327) }, /* Azurewave */
  33         { USB_DEVICE(0x13D3, 0x3328) }, /* Azurewave */
  34         { USB_DEVICE(0x13D3, 0x3346) }, /* IMC Networks */
  35         { USB_DEVICE(0x13D3, 0x3348) }, /* Azurewave */
  36         { USB_DEVICE(0x13D3, 0x3349) }, /* Azurewave */
  37         { USB_DEVICE(0x13D3, 0x3350) }, /* Azurewave */
  38         { USB_DEVICE(0x04CA, 0x4605) }, /* Liteon */
  39         { USB_DEVICE(0x040D, 0x3801) }, /* VIA */
  40         { USB_DEVICE(0x0cf3, 0xb003) }, /* Ubiquiti WifiStation Ext */
  41
  42         { USB_DEVICE(0x0cf3, 0x7015),
  43           .driver_info = AR9287_USB },  /* Atheros */
  44         { USB_DEVICE(0x1668, 0x1200),
  45           .driver_info = AR9287_USB },  /* Verizon */
  46
  47         { USB_DEVICE(0x0cf3, 0x7010),
  48           .driver_info = AR9280_USB },  /* Atheros */
  49         { USB_DEVICE(0x0846, 0x9018),
  50           .driver_info = AR9280_USB },  /* Netgear WNDA3200 */
  51         { USB_DEVICE(0x083A, 0xA704),
  52           .driver_info = AR9280_USB },  /* SMC Networks */
  53         { USB_DEVICE(0x0411, 0x017f),
  54           .driver_info = AR9280_USB },  /* Sony UWA-BR100 */
  55
  56         { USB_DEVICE(0x0cf3, 0x20ff),
  57           .driver_info = STORAGE_DEVICE },
  58
  59         { },
  60 };
  61
  62 MODULE_DEVICE_TABLE(usb, ath9k_hif_usb_ids);
  63
  64 static int __hif_usb_tx(struct hif_device_usb *hif_dev);
  65
  66 static void hif_usb_regout_cb(struct urb *urb)
  67 {
  68         struct cmd_buf *cmd = (struct cmd_buf *)urb->context;
  69
  70         switch (urb->status) {
  71         case 0:
  72                 break;
  73         case -ENOENT:
  74         case -ECONNRESET:
  75         case -ENODEV:
  76         case -ESHUTDOWN:
  77                 goto free;
  78         default:
  79                 break;
  80         }
  81
  82         if (cmd) {
  83                 ath9k_htc_txcompletion_cb(cmd->hif_dev->htc_handle,
  84                                           cmd->skb, true);
  85                 kfree(cmd);
  86         }
  87
  88         return;
  89 free:
  90         kfree_skb(cmd->skb);
  91         kfree(cmd);
  92 }
  93
  94 static int hif_usb_send_regout(struct hif_device_usb *hif_dev,
  95                                struct sk_buff *skb)
  96 {
  97         struct urb *urb;
  98         struct cmd_buf *cmd;
  99         int ret = 0;
 100
 101         urb = usb_alloc_urb(0, GFP_KERNEL);
 102         if (urb == NULL)
 103                 return -ENOMEM;
 104
 105         cmd = kzalloc(sizeof(*cmd), GFP_KERNEL);
 106         if (cmd == NULL) {
 107                 usb_free_urb(urb);
 108                 return -ENOMEM;
 109         }
 110
 111         cmd->skb = skb;
 112         cmd->hif_dev = hif_dev;
 113
 114         usb_fill_bulk_urb(urb, hif_dev->udev,
 115                          usb_sndbulkpipe(hif_dev->udev, USB_REG_OUT_PIPE),
 116                          skb->data, skb->len,
 117                          hif_usb_regout_cb, cmd);
 118
 119         usb_anchor_urb(urb, &hif_dev->regout_submitted);
 120         ret = usb_submit_urb(urb, GFP_KERNEL);
 121         if (ret) {
 122                 usb_unanchor_urb(urb);
 123                 kfree(cmd);
 124         }
 125         usb_free_urb(urb);
 126
 127         return ret;
 128 }
 129
 130 static void hif_usb_mgmt_cb(struct urb *urb)
 131 {
 132         struct cmd_buf *cmd = (struct cmd_buf *)urb->context;
 133         struct hif_device_usb *hif_dev = cmd->hif_dev;
 134         bool txok = true;
 135
 136         if (!cmd || !cmd->skb || !cmd->hif_dev)
 137                 return;
 138
 139         switch (urb->status) {
 140         case 0:
 141                 break;
 142         case -ENOENT:
 143         case -ECONNRESET:
 144         case -ENODEV:
 145         case -ESHUTDOWN:
 146                 txok = false;
 147
 148                 /*
 149                  * If the URBs are being flushed, no need to complete
 150                  * this packet.
 151                  */
 152                 spin_lock(&hif_dev->tx.tx_lock);
 153                 if (hif_dev->tx.flags & HIF_USB_TX_FLUSH) {
 154                         spin_unlock(&hif_dev->tx.tx_lock);
 155                         dev_kfree_skb_any(cmd->skb);
 156                         kfree(cmd);
 157                         return;
 158                 }
 159                 spin_unlock(&hif_dev->tx.tx_lock);
 160
 161                 break;
 162         default:
 163                 txok = false;
 164                 break;
 165         }
 166
 167         skb_pull(cmd->skb, 4);
 168         ath9k_htc_txcompletion_cb(cmd->hif_dev->htc_handle,
 169                                   cmd->skb, txok);
 170         kfree(cmd);
 171 }
 172
 173 static int hif_usb_send_mgmt(struct hif_device_usb *hif_dev,
 174                              struct sk_buff *skb)
 175 {
 176         struct urb *urb;
 177         struct cmd_buf *cmd;
 178         int ret = 0;
 179         __le16 *hdr;
 180
 181         urb = usb_alloc_urb(0, GFP_ATOMIC);
 182         if (urb == NULL)
 183                 return -ENOMEM;
 184
 185         cmd = kzalloc(sizeof(*cmd), GFP_ATOMIC);
 186         if (cmd == NULL) {
 187                 usb_free_urb(urb);
 188                 return -ENOMEM;
 189         }
 190
 191         cmd->skb = skb;
 192         cmd->hif_dev = hif_dev;
 193
 194         hdr = (__le16 *) skb_push(skb, 4);
 195         *hdr++ = cpu_to_le16(skb->len - 4);
 196         *hdr++ = cpu_to_le16(ATH_USB_TX_STREAM_MODE_TAG);
 197
 198         usb_fill_bulk_urb(urb, hif_dev->udev,
 199                          usb_sndbulkpipe(hif_dev->udev, USB_WLAN_TX_PIPE),
 200                          skb->data, skb->len,
 201                          hif_usb_mgmt_cb, cmd);
 202
 203         usb_anchor_urb(urb, &hif_dev->mgmt_submitted);
 204         ret = usb_submit_urb(urb, GFP_ATOMIC);
 205         if (ret) {
 206                 usb_unanchor_urb(urb);
 207                 kfree(cmd);
 208         }
 209         usb_free_urb(urb);
 210
 211         return ret;
 212 }
 213
 214 static inline void ath9k_skb_queue_purge(struct hif_device_usb *hif_dev,
 215                                          struct sk_buff_head *list)
 216 {
 217         struct sk_buff *skb;
 218
 219         while ((skb = __skb_dequeue(list)) != NULL) {
 220                 dev_kfree_skb_any(skb);
 221         }
 222 }
 223
 224 static inline void ath9k_skb_queue_complete(struct hif_device_usb *hif_dev,
 225                                             struct sk_buff_head *queue,
 226                                             bool txok)
 227 {
 228         struct sk_buff *skb;
 229
 230         while ((skb = __skb_dequeue(queue)) != NULL) {
 231                 ath9k_htc_txcompletion_cb(hif_dev->htc_handle,
 232                                           skb, txok);
 233                 if (txok)
 234                         TX_STAT_INC(skb_success);
 235                 else
 236                         TX_STAT_INC(skb_failed);
 237         }
 238 }
 239
 240 static void hif_usb_tx_cb(struct urb *urb)
 241 {
 242         struct tx_buf *tx_buf = (struct tx_buf *) urb->context;
 243         struct hif_device_usb *hif_dev;
 244         bool txok = true;
 245
 246         if (!tx_buf || !tx_buf->hif_dev)
 247                 return;
 248
 249         hif_dev = tx_buf->hif_dev;
 250
 251         switch (urb->status) {
 252         case 0:
 253                 break;
 254         case -ENOENT:
 255         case -ECONNRESET:
 256         case -ENODEV:
 257         case -ESHUTDOWN:
 258                 txok = false;
 259
 260                 /*
 261                  * If the URBs are being flushed, no need to add this
 262                  * URB to the free list.
 263                  */
 264                 spin_lock(&hif_dev->tx.tx_lock);
 265                 if (hif_dev->tx.flags & HIF_USB_TX_FLUSH) {
 266                         spin_unlock(&hif_dev->tx.tx_lock);
 267                         ath9k_skb_queue_purge(hif_dev, &tx_buf->skb_queue);
 268                         return;
 269                 }
 270                 spin_unlock(&hif_dev->tx.tx_lock);
 271
 272                 break;
 273         default:
 274                 txok = false;
 275                 break;
 276         }
 277
 278         ath9k_skb_queue_complete(hif_dev, &tx_buf->skb_queue, txok);
 279
 280         /* Re-initialize the SKB queue */
 281         tx_buf->len = tx_buf->offset = 0;
 282         __skb_queue_head_init(&tx_buf->skb_queue);
 283
 284         /* Add this TX buffer to the free list */
 285         spin_lock(&hif_dev->tx.tx_lock);
 286         list_move_tail(&tx_buf->list, &hif_dev->tx.tx_buf);
 287         hif_dev->tx.tx_buf_cnt++;
 288         if (!(hif_dev->tx.flags & HIF_USB_TX_STOP))
 289                 __hif_usb_tx(hif_dev); /* Check for pending SKBs */
 290         TX_STAT_INC(buf_completed);
 291         spin_unlock(&hif_dev->tx.tx_lock);
 292 }
 293
 294 /* TX lock has to be taken */
 295 static int __hif_usb_tx(struct hif_device_usb *hif_dev)
 296 {
 297         struct tx_buf *tx_buf = NULL;
 298         struct sk_buff *nskb = NULL;
 299         int ret = 0, i;
 300         u16 tx_skb_cnt = 0;
 301         u8 *buf;
 302         __le16 *hdr;
 303
 304         if (hif_dev->tx.tx_skb_cnt == 0)
 305                 return 0;
 306
 307         /* Check if a free TX buffer is available */
 308         if (list_empty(&hif_dev->tx.tx_buf))
 309                 return 0;
 310
 311         tx_buf = list_first_entry(&hif_dev->tx.tx_buf, struct tx_buf, list);
 312         list_move_tail(&tx_buf->list, &hif_dev->tx.tx_pending);
 313         hif_dev->tx.tx_buf_cnt--;
 314
 315         tx_skb_cnt = min_t(u16, hif_dev->tx.tx_skb_cnt, MAX_TX_AGGR_NUM);
 316
 317         for (i = 0; i < tx_skb_cnt; i++) {
 318                 nskb = __skb_dequeue(&hif_dev->tx.tx_skb_queue);
 319
 320                 /* Should never be NULL */
 321                 BUG_ON(!nskb);
 322
 323                 hif_dev->tx.tx_skb_cnt--;
 324
 325                 buf = tx_buf->buf;
 326                 buf += tx_buf->offset;
 327                 hdr = (__le16 *)buf;
 328                 *hdr++ = cpu_to_le16(nskb->len);
 329                 *hdr++ = cpu_to_le16(ATH_USB_TX_STREAM_MODE_TAG);
 330                 buf += 4;
 331                 memcpy(buf, nskb->data, nskb->len);
 332                 tx_buf->len = nskb->len + 4;
 333
 334                 if (i < (tx_skb_cnt - 1))
 335                         tx_buf->offset += (((tx_buf->len - 1) / 4) + 1) * 4;
 336
 337                 if (i == (tx_skb_cnt - 1))
 338                         tx_buf->len += tx_buf->offset;
 339
 340                 __skb_queue_tail(&tx_buf->skb_queue, nskb);
 341                 TX_STAT_INC(skb_queued);
 342         }
 343
 344         usb_fill_bulk_urb(tx_buf->urb, hif_dev->udev,
 345                           usb_sndbulkpipe(hif_dev->udev, USB_WLAN_TX_PIPE),
 346                           tx_buf->buf, tx_buf->len,
 347                           hif_usb_tx_cb, tx_buf);
 348
 349         ret = usb_submit_urb(tx_buf->urb, GFP_ATOMIC);
 350         if (ret) {
 351                 tx_buf->len = tx_buf->offset = 0;
 352                 ath9k_skb_queue_complete(hif_dev, &tx_buf->skb_queue, false);
 353                 __skb_queue_head_init(&tx_buf->skb_queue);
 354                 list_move_tail(&tx_buf->list, &hif_dev->tx.tx_buf);
 355                 hif_dev->tx.tx_buf_cnt++;
 356         }
 357
 358         if (!ret)
 359                 TX_STAT_INC(buf_queued);
 360
 361         return ret;
 362 }
 363
 364 static int hif_usb_send_tx(struct hif_device_usb *hif_dev, struct sk_buff *skb)
 365 {
 366         struct ath9k_htc_tx_ctl *tx_ctl;
 367         unsigned long flags;
 368         int ret = 0;
 369
 370         spin_lock_irqsave(&hif_dev->tx.tx_lock, flags);
 371
 372         if (hif_dev->tx.flags & HIF_USB_TX_STOP) {
 373                 spin_unlock_irqrestore(&hif_dev->tx.tx_lock, flags);
 374                 return -ENODEV;
 375         }
 376
 377         /* Check if the max queue count has been reached */
 378         if (hif_dev->tx.tx_skb_cnt > MAX_TX_BUF_NUM) {
 379                 spin_unlock_irqrestore(&hif_dev->tx.tx_lock, flags);
 380                 return -ENOMEM;
 381         }
 382
 383         spin_unlock_irqrestore(&hif_dev->tx.tx_lock, flags);
 384
 385         tx_ctl = HTC_SKB_CB(skb);
 386
 387         /* Mgmt/Beacon frames don't use the TX buffer pool */
 388         if ((tx_ctl->type == ATH9K_HTC_MGMT) ||
 389             (tx_ctl->type == ATH9K_HTC_BEACON)) {
 390                 ret = hif_usb_send_mgmt(hif_dev, skb);
 391         }
 392
 393         spin_lock_irqsave(&hif_dev->tx.tx_lock, flags);
 394
 395         if ((tx_ctl->type == ATH9K_HTC_NORMAL) ||
 396             (tx_ctl->type == ATH9K_HTC_AMPDU)) {
 397                 __skb_queue_tail(&hif_dev->tx.tx_skb_queue, skb);
 398                 hif_dev->tx.tx_skb_cnt++;
 399         }
 400
 401         /* Check if AMPDUs have to be sent immediately */
 402         if ((hif_dev->tx.tx_buf_cnt == MAX_TX_URB_NUM) &&
 403             (hif_dev->tx.tx_skb_cnt < 2)) {
 404                 __hif_usb_tx(hif_dev);
 405         }
 406
 407         spin_unlock_irqrestore(&hif_dev->tx.tx_lock, flags);
 408
 409         return ret;
 410 }
 411
 412 static void hif_usb_start(void *hif_handle)
 413 {
 414         struct hif_device_usb *hif_dev = (struct hif_device_usb *)hif_handle;
 415         unsigned long flags;
 416
 417         hif_dev->flags |= HIF_USB_START;
 418
 419         spin_lock_irqsave(&hif_dev->tx.tx_lock, flags);
 420         hif_dev->tx.flags &= ~HIF_USB_TX_STOP;
 421         spin_unlock_irqrestore(&hif_dev->tx.tx_lock, flags);
 422 }
 423
 424 static void hif_usb_stop(void *hif_handle)
 425 {
 426         struct hif_device_usb *hif_dev = (struct hif_device_usb *)hif_handle;
 427         struct tx_buf *tx_buf = NULL, *tx_buf_tmp = NULL;
 428         unsigned long flags;
 429
 430         spin_lock_irqsave(&hif_dev->tx.tx_lock, flags);
 431         ath9k_skb_queue_complete(hif_dev, &hif_dev->tx.tx_skb_queue, false);
 432         hif_dev->tx.tx_skb_cnt = 0;
 433         hif_dev->tx.flags |= HIF_USB_TX_STOP;
 434         spin_unlock_irqrestore(&hif_dev->tx.tx_lock, flags);
 435
 436         /* The pending URBs have to be canceled. */
 437         list_for_each_entry_safe(tx_buf, tx_buf_tmp,
 438                                  &hif_dev->tx.tx_pending, list) {
 439                 usb_kill_urb(tx_buf->urb);
 440         }
 441
 442         usb_kill_anchored_urbs(&hif_dev->mgmt_submitted);
 443 }
 444
 445 static int hif_usb_send(void *hif_handle, u8 pipe_id, struct sk_buff *skb)
 446 {
 447         struct hif_device_usb *hif_dev = (struct hif_device_usb *)hif_handle;
 448         int ret = 0;
 449
 450         switch (pipe_id) {
 451         case USB_WLAN_TX_PIPE:
 452                 ret = hif_usb_send_tx(hif_dev, skb);
 453                 break;
 454         case USB_REG_OUT_PIPE:
 455                 ret = hif_usb_send_regout(hif_dev, skb);
 456                 break;
 457         default:
 458                 dev_err(&hif_dev->udev->dev,
 459                         "ath9k_htc: Invalid TX pipe: %d\n", pipe_id);
 460                 ret = -EINVAL;
 461                 break;
 462         }
 463
 464         return ret;
 465 }
 466
 467 static inline bool check_index(struct sk_buff *skb, u8 idx)
 468 {
 469         struct ath9k_htc_tx_ctl *tx_ctl;
 470
 471         tx_ctl = HTC_SKB_CB(skb);
 472
 473         if ((tx_ctl->type == ATH9K_HTC_AMPDU) &&
 474             (tx_ctl->sta_idx == idx))
 475                 return true;
 476
 477         return false;
 478 }
 479
 480 static void hif_usb_sta_drain(void *hif_handle, u8 idx)
 481 {
 482         struct hif_device_usb *hif_dev = (struct hif_device_usb *)hif_handle;
 483         struct sk_buff *skb, *tmp;
 484         unsigned long flags;
 485
 486         spin_lock_irqsave(&hif_dev->tx.tx_lock, flags);
 487
 488         skb_queue_walk_safe(&hif_dev->tx.tx_skb_queue, skb, tmp) {
 489                 if (check_index(skb, idx)) {
 490                         __skb_unlink(skb, &hif_dev->tx.tx_skb_queue);
 491                         ath9k_htc_txcompletion_cb(hif_dev->htc_handle,
 492                                                   skb, false);
 493                         hif_dev->tx.tx_skb_cnt--;
 494                         TX_STAT_INC(skb_failed);
 495                 }
 496         }
 497
 498         spin_unlock_irqrestore(&hif_dev->tx.tx_lock, flags);
 499 }
 500
 501 static struct ath9k_htc_hif hif_usb = {
 502         .transport = ATH9K_HIF_USB,
 503         .name = "ath9k_hif_usb",
 504
 505         .control_ul_pipe = USB_REG_OUT_PIPE,
 506         .control_dl_pipe = USB_REG_IN_PIPE,
 507
 508         .start = hif_usb_start,
 509         .stop = hif_usb_stop,
 510         .sta_drain = hif_usb_sta_drain,
 511         .send = hif_usb_send,
 512 };
 513
 514 static void ath9k_hif_usb_rx_stream(struct hif_device_usb *hif_dev,
 515                                     struct sk_buff *skb)
 516 {
 517         struct sk_buff *nskb, *skb_pool[MAX_PKT_NUM_IN_TRANSFER];
 518         int index = 0, i = 0, len = skb->len;
 519         int rx_remain_len, rx_pkt_len;
 520         u16 pool_index = 0;
 521         u8 *ptr;
 522
 523         spin_lock(&hif_dev->rx_lock);
 524
 525         rx_remain_len = hif_dev->rx_remain_len;
 526         rx_pkt_len = hif_dev->rx_transfer_len;
 527
 528         if (rx_remain_len != 0) {
 529                 struct sk_buff *remain_skb = hif_dev->remain_skb;
 530
 531                 if (remain_skb) {
 532                         ptr = (u8 *) remain_skb->data;
 533
 534                         index = rx_remain_len;
 535                         rx_remain_len -= hif_dev->rx_pad_len;
 536                         ptr += rx_pkt_len;
 537
 538                         memcpy(ptr, skb->data, rx_remain_len);
 539
 540                         rx_pkt_len += rx_remain_len;
 541                         hif_dev->rx_remain_len = 0;
 542                         skb_put(remain_skb, rx_pkt_len);
 543
 544                         skb_pool[pool_index++] = remain_skb;
 545
 546                 } else {
 547                         index = rx_remain_len;
 548                 }
 549         }
 550
 551         spin_unlock(&hif_dev->rx_lock);
 552
 553         while (index < len) {
 554                 u16 pkt_len;
 555                 u16 pkt_tag;
 556                 u16 pad_len;
 557                 int chk_idx;
 558
 559                 ptr = (u8 *) skb->data;
 560
 561                 pkt_len = get_unaligned_le16(ptr + index);
 562                 pkt_tag = get_unaligned_le16(ptr + index + 2);
 563
 564                 if (pkt_tag != ATH_USB_RX_STREAM_MODE_TAG) {
 565                         RX_STAT_INC(skb_dropped);
 566                         return;
 567                 }
 568
 569                 pad_len = 4 - (pkt_len & 0x3);
 570                 if (pad_len == 4)
 571                         pad_len = 0;
 572
 573                 chk_idx = index;
 574                 index = index + 4 + pkt_len + pad_len;
 575
 576                 if (index > MAX_RX_BUF_SIZE) {
 577                         spin_lock(&hif_dev->rx_lock);
 578                         hif_dev->rx_remain_len = index - MAX_RX_BUF_SIZE;
 579                         hif_dev->rx_transfer_len =
 580                                 MAX_RX_BUF_SIZE - chk_idx - 4;
 581                         hif_dev->rx_pad_len = pad_len;
 582
 583                         nskb = __dev_alloc_skb(pkt_len + 32, GFP_ATOMIC);
 584                         if (!nskb) {
 585                                 dev_err(&hif_dev->udev->dev,
 586                                         "ath9k_htc: RX memory allocation error\n");
 587                                 spin_unlock(&hif_dev->rx_lock);
 588                                 goto err;
 589                         }
 590                         skb_reserve(nskb, 32);
 591                         RX_STAT_INC(skb_allocated);
 592
 593                         memcpy(nskb->data, &(skb->data[chk_idx+4]),
 594                                hif_dev->rx_transfer_len);
 595
 596                         /* Record the buffer pointer */
 597                         hif_dev->remain_skb = nskb;
 598                         spin_unlock(&hif_dev->rx_lock);
 599                 } else {
 600                         nskb = __dev_alloc_skb(pkt_len + 32, GFP_ATOMIC);
 601                         if (!nskb) {
 602                                 dev_err(&hif_dev->udev->dev,
 603                                         "ath9k_htc: RX memory allocation error\n");
 604                                 goto err;
 605                         }
 606                         skb_reserve(nskb, 32);
 607                         RX_STAT_INC(skb_allocated);
 608
 609                         memcpy(nskb->data, &(skb->data[chk_idx+4]), pkt_len);
 610                         skb_put(nskb, pkt_len);
 611                         skb_pool[pool_index++] = nskb;
 612                 }
 613         }
 614
 615 err:
 616         for (i = 0; i < pool_index; i++) {
 617                 ath9k_htc_rx_msg(hif_dev->htc_handle, skb_pool[i],
 618                                  skb_pool[i]->len, USB_WLAN_RX_PIPE);
 619                 RX_STAT_INC(skb_completed);
 620         }
 621 }
 622
 623 static void ath9k_hif_usb_rx_cb(struct urb *urb)
 624 {
 625         struct sk_buff *skb = (struct sk_buff *) urb->context;
 626         struct hif_device_usb *hif_dev =
 627                 usb_get_intfdata(usb_ifnum_to_if(urb->dev, 0));
 628         int ret;
 629
 630         if (!skb)
 631                 return;
 632
 633         if (!hif_dev)
 634                 goto free;
 635
 636         switch (urb->status) {
 637         case 0:
 638                 break;
 639         case -ENOENT:
 640         case -ECONNRESET:
 641         case -ENODEV:
 642         case -ESHUTDOWN:
 643                 goto free;
 644         default:
 645                 goto resubmit;
 646         }
 647
 648         if (likely(urb->actual_length != 0)) {
 649                 skb_put(skb, urb->actual_length);
 650                 ath9k_hif_usb_rx_stream(hif_dev, skb);
 651         }
 652
 653 resubmit:
 654         skb_reset_tail_pointer(skb);
 655         skb_trim(skb, 0);
 656
 657         usb_anchor_urb(urb, &hif_dev->rx_submitted);
 658         ret = usb_submit_urb(urb, GFP_ATOMIC);
 659         if (ret) {
 660                 usb_unanchor_urb(urb);
 661                 goto free;
 662         }
 663
 664         return;
 665 free:
 666         kfree_skb(skb);
 667 }
 668
 669 static void ath9k_hif_usb_reg_in_cb(struct urb *urb)
 670 {
 671         struct sk_buff *skb = (struct sk_buff *) urb->context;
 672         struct sk_buff *nskb;
 673         struct hif_device_usb *hif_dev =
 674                 usb_get_intfdata(usb_ifnum_to_if(urb->dev, 0));
 675         int ret;
 676
 677         if (!skb)
 678                 return;
 679
 680         if (!hif_dev)
 681                 goto free;
 682
 683         switch (urb->status) {
 684         case 0:
 685                 break;
 686         case -ENOENT:
 687         case -ECONNRESET:
 688         case -ENODEV:
 689         case -ESHUTDOWN:
 690                 goto free;
 691         default:
 692                 skb_reset_tail_pointer(skb);
 693                 skb_trim(skb, 0);
 694
 695                 goto resubmit;
 696         }
 697
 698         if (likely(urb->actual_length != 0)) {
 699                 skb_put(skb, urb->actual_length);
 700
 701                 /* Process the command first */
 702                 ath9k_htc_rx_msg(hif_dev->htc_handle, skb,
 703                                  skb->len, USB_REG_IN_PIPE);
 704
 705
 706                 nskb = alloc_skb(MAX_REG_IN_BUF_SIZE, GFP_ATOMIC);
 707                 if (!nskb) {
 708                         dev_err(&hif_dev->udev->dev,
 709                                 "ath9k_htc: REG_IN memory allocation failure\n");
 710                         urb->context = NULL;
 711                         return;
 712                 }
 713
 714                 usb_fill_bulk_urb(urb, hif_dev->udev,
 715                                  usb_rcvbulkpipe(hif_dev->udev,
 716                                                  USB_REG_IN_PIPE),
 717                                  nskb->data, MAX_REG_IN_BUF_SIZE,
 718                                  ath9k_hif_usb_reg_in_cb, nskb);
 719         }
 720
 721 resubmit:
 722         usb_anchor_urb(urb, &hif_dev->reg_in_submitted);
 723         ret = usb_submit_urb(urb, GFP_ATOMIC);
 724         if (ret) {
 725                 usb_unanchor_urb(urb);
 726                 goto free;
 727         }
 728
 729         return;
 730 free:
 731         kfree_skb(skb);
 732         urb->context = NULL;
 733 }
 734
 735 static void ath9k_hif_usb_dealloc_tx_urbs(struct hif_device_usb *hif_dev)
 736 {
 737         struct tx_buf *tx_buf = NULL, *tx_buf_tmp = NULL;
 738         unsigned long flags;
 739
 740         list_for_each_entry_safe(tx_buf, tx_buf_tmp,
 741                                  &hif_dev->tx.tx_buf, list) {
 742                 usb_kill_urb(tx_buf->urb);
 743                 list_del(&tx_buf->list);
 744                 usb_free_urb(tx_buf->urb);
 745                 kfree(tx_buf->buf);
 746                 kfree(tx_buf);
 747         }
 748
 749         spin_lock_irqsave(&hif_dev->tx.tx_lock, flags);
 750         hif_dev->tx.flags |= HIF_USB_TX_FLUSH;
 751         spin_unlock_irqrestore(&hif_dev->tx.tx_lock, flags);
 752
 753         list_for_each_entry_safe(tx_buf, tx_buf_tmp,
 754                                  &hif_dev->tx.tx_pending, list) {
 755                 usb_kill_urb(tx_buf->urb);
 756                 list_del(&tx_buf->list);
 757                 usb_free_urb(tx_buf->urb);
 758                 kfree(tx_buf->buf);
 759                 kfree(tx_buf);
 760         }
 761
 762         usb_kill_anchored_urbs(&hif_dev->mgmt_submitted);
 763 }
 764
 765 static int ath9k_hif_usb_alloc_tx_urbs(struct hif_device_usb *hif_dev)
 766 {
 767         struct tx_buf *tx_buf;
 768         int i;
 769
 770         INIT_LIST_HEAD(&hif_dev->tx.tx_buf);
 771         INIT_LIST_HEAD(&hif_dev->tx.tx_pending);
 772         spin_lock_init(&hif_dev->tx.tx_lock);
 773         __skb_queue_head_init(&hif_dev->tx.tx_skb_queue);
 774         init_usb_anchor(&hif_dev->mgmt_submitted);
 775
 776         for (i = 0; i < MAX_TX_URB_NUM; i++) {
 777                 tx_buf = kzalloc(sizeof(struct tx_buf), GFP_KERNEL);
 778                 if (!tx_buf)
 779                         goto err;
 780
 781                 tx_buf->buf = kzalloc(MAX_TX_BUF_SIZE, GFP_KERNEL);
 782                 if (!tx_buf->buf)
 783                         goto err;
 784
 785                 tx_buf->urb = usb_alloc_urb(0, GFP_KERNEL);
 786                 if (!tx_buf->urb)
 787                         goto err;
 788
 789                 tx_buf->hif_dev = hif_dev;
 790                 __skb_queue_head_init(&tx_buf->skb_queue);
 791
 792                 list_add_tail(&tx_buf->list, &hif_dev->tx.tx_buf);
 793         }
 794
 795         hif_dev->tx.tx_buf_cnt = MAX_TX_URB_NUM;
 796
 797         return 0;
 798 err:
 799         if (tx_buf) {
 800                 kfree(tx_buf->buf);
 801                 kfree(tx_buf);
 802         }
 803         ath9k_hif_usb_dealloc_tx_urbs(hif_dev);
 804         return -ENOMEM;
 805 }
 806
 807 static void ath9k_hif_usb_dealloc_rx_urbs(struct hif_device_usb *hif_dev)
 808 {
 809         usb_kill_anchored_urbs(&hif_dev->rx_submitted);
 810 }
 811
 812 static int ath9k_hif_usb_alloc_rx_urbs(struct hif_device_usb *hif_dev)
 813 {
 814         struct urb *urb = NULL;
 815         struct sk_buff *skb = NULL;
 816         int i, ret;
 817
 818         init_usb_anchor(&hif_dev->rx_submitted);
 819         spin_lock_init(&hif_dev->rx_lock);
 820
 821         for (i = 0; i < MAX_RX_URB_NUM; i++) {
 822
 823                 /* Allocate URB */
 824                 urb = usb_alloc_urb(0, GFP_KERNEL);
 825                 if (urb == NULL) {
 826                         ret = -ENOMEM;
 827                         goto err_urb;
 828                 }
 829
 830                 /* Allocate buffer */
 831                 skb = alloc_skb(MAX_RX_BUF_SIZE, GFP_KERNEL);
 832                 if (!skb) {
 833                         ret = -ENOMEM;
 834                         goto err_skb;
 835                 }
 836
 837                 usb_fill_bulk_urb(urb, hif_dev->udev,
 838                                   usb_rcvbulkpipe(hif_dev->udev,
 839                                                   USB_WLAN_RX_PIPE),
 840                                   skb->data, MAX_RX_BUF_SIZE,
 841                                   ath9k_hif_usb_rx_cb, skb);
 842
 843                 /* Anchor URB */
 844                 usb_anchor_urb(urb, &hif_dev->rx_submitted);
 845
 846                 /* Submit URB */
 847                 ret = usb_submit_urb(urb, GFP_KERNEL);
 848                 if (ret) {
 849                         usb_unanchor_urb(urb);
 850                         goto err_submit;
 851                 }
 852
 853                 /*
 854                  * Drop reference count.
 855                  * This ensures that the URB is freed when killing them.
 856                  */
 857                 usb_free_urb(urb);
 858         }
 859
 860         return 0;
 861
 862 err_submit:
 863         kfree_skb(skb);
 864 err_skb:
 865         usb_free_urb(urb);
 866 err_urb:
 867         ath9k_hif_usb_dealloc_rx_urbs(hif_dev);
 868         return ret;
 869 }
 870
 871 static void ath9k_hif_usb_dealloc_reg_in_urbs(struct hif_device_usb *hif_dev)
 872 {
 873         usb_kill_anchored_urbs(&hif_dev->reg_in_submitted);
 874 }
 875
 876 static int ath9k_hif_usb_alloc_reg_in_urbs(struct hif_device_usb *hif_dev)
 877 {
 878         struct urb *urb = NULL;
 879         struct sk_buff *skb = NULL;
 880         int i, ret;
 881
 882         init_usb_anchor(&hif_dev->reg_in_submitted);
 883
 884         for (i = 0; i < MAX_REG_IN_URB_NUM; i++) {
 885
 886                 /* Allocate URB */
 887                 urb = usb_alloc_urb(0, GFP_KERNEL);
 888                 if (urb == NULL) {
 889                         ret = -ENOMEM;
 890                         goto err_urb;
 891                 }
 892
 893                 /* Allocate buffer */
 894                 skb = alloc_skb(MAX_REG_IN_BUF_SIZE, GFP_KERNEL);
 895                 if (!skb) {
 896                         ret = -ENOMEM;
 897                         goto err_skb;
 898                 }
 899
 900                 usb_fill_bulk_urb(urb, hif_dev->udev,
 901                                   usb_rcvbulkpipe(hif_dev->udev,
 902                                                   USB_REG_IN_PIPE),
 903                                   skb->data, MAX_REG_IN_BUF_SIZE,
 904                                   ath9k_hif_usb_reg_in_cb, skb);
 905
 906                 /* Anchor URB */
 907                 usb_anchor_urb(urb, &hif_dev->reg_in_submitted);
 908
 909                 /* Submit URB */
 910                 ret = usb_submit_urb(urb, GFP_KERNEL);
 911                 if (ret) {
 912                         usb_unanchor_urb(urb);
 913                         goto err_submit;
 914                 }
 915
 916                 /*
 917                  * Drop reference count.
 918                  * This ensures that the URB is freed when killing them.
 919                  */
 920                 usb_free_urb(urb);
 921         }
 922
 923         return 0;
 924
 925 err_submit:
 926         kfree_skb(skb);
 927 err_skb:
 928         usb_free_urb(urb);
 929 err_urb:
 930         ath9k_hif_usb_dealloc_reg_in_urbs(hif_dev);
 931         return ret;
 932 }
 933
 934 static int ath9k_hif_usb_alloc_urbs(struct hif_device_usb *hif_dev)
 935 {
 936         /* Register Write */
 937         init_usb_anchor(&hif_dev->regout_submitted);
 938
 939         /* TX */
 940         if (ath9k_hif_usb_alloc_tx_urbs(hif_dev) < 0)
 941                 goto err;
 942
 943         /* RX */
 944         if (ath9k_hif_usb_alloc_rx_urbs(hif_dev) < 0)
 945                 goto err_rx;
 946
 947         /* Register Read */
 948         if (ath9k_hif_usb_alloc_reg_in_urbs(hif_dev) < 0)
 949                 goto err_reg;
 950
 951         return 0;
 952 err_reg:
 953         ath9k_hif_usb_dealloc_rx_urbs(hif_dev);
 954 err_rx:
 955         ath9k_hif_usb_dealloc_tx_urbs(hif_dev);
 956 err:
 957         return -ENOMEM;
 958 }
 959
 960 static void ath9k_hif_usb_dealloc_urbs(struct hif_device_usb *hif_dev)
 961 {
 962         usb_kill_anchored_urbs(&hif_dev->regout_submitted);
 963         ath9k_hif_usb_dealloc_reg_in_urbs(hif_dev);
 964         ath9k_hif_usb_dealloc_tx_urbs(hif_dev);
 965         ath9k_hif_usb_dealloc_rx_urbs(hif_dev);
 966 }
 967
 968 static int ath9k_hif_usb_download_fw(struct hif_device_usb *hif_dev,
 969                                      u32 drv_info)
 970 {
 971         int transfer, err;
 972         const void *data = hif_dev->firmware->data;
 973         size_t len = hif_dev->firmware->size;
 974         u32 addr = AR9271_FIRMWARE;
 975         u8 *buf = kzalloc(4096, GFP_KERNEL);
 976         u32 firm_offset;
 977
 978         if (!buf)
 979                 return -ENOMEM;
 980
 981         while (len) {
 982                 transfer = min_t(int, len, 4096);
 983                 memcpy(buf, data, transfer);
 984
 985                 err = usb_control_msg(hif_dev->udev,
 986                                       usb_sndctrlpipe(hif_dev->udev, 0),
 987                                       FIRMWARE_DOWNLOAD, 0x40 | USB_DIR_OUT,
 988                                       addr >> 8, 0, buf, transfer, HZ);
 989                 if (err < 0) {
 990                         kfree(buf);
 991                         return err;
 992                 }
 993
 994                 len -= transfer;
 995                 data += transfer;
 996                 addr += transfer;
 997         }
 998         kfree(buf);
 999
1000         if (IS_AR7010_DEVICE(drv_info))
1001                 firm_offset = AR7010_FIRMWARE_TEXT;
1002         else
1003                 firm_offset = AR9271_FIRMWARE_TEXT;
1004
1005         /*
1006          * Issue FW download complete command to firmware.
1007          */
1008         err = usb_control_msg(hif_dev->udev, usb_sndctrlpipe(hif_dev->udev, 0),
1009                               FIRMWARE_DOWNLOAD_COMP,
1010                               0x40 | USB_DIR_OUT,
1011                               firm_offset >> 8, 0, NULL, 0, HZ);
1012         if (err)
1013                 return -EIO;
1014
1015         dev_info(&hif_dev->udev->dev, "ath9k_htc: Transferred FW: %s, size: %ld\n",
1016                  hif_dev->fw_name, (unsigned long) hif_dev->firmware->size);
1017
1018         return 0;
1019 }
1020
1021 static int ath9k_hif_usb_dev_init(struct hif_device_usb *hif_dev, u32 drv_info)
1022 {
1023         int ret, idx;
1024         struct usb_host_interface *alt = &hif_dev->interface->altsetting[0];
1025         struct usb_endpoint_descriptor *endp;
1026
1027         /* Request firmware */
1028         ret = request_firmware(&hif_dev->firmware, hif_dev->fw_name,
1029                                &hif_dev->udev->dev);
1030         if (ret) {
1031                 dev_err(&hif_dev->udev->dev,
1032                         "ath9k_htc: Firmware - %s not found\n", hif_dev->fw_name);
1033                 goto err_fw_req;
1034         }
1035
1036         /* Download firmware */
1037         ret = ath9k_hif_usb_download_fw(hif_dev, drv_info);
1038         if (ret) {
1039                 dev_err(&hif_dev->udev->dev,
1040                         "ath9k_htc: Firmware - %s download failed\n",
1041                         hif_dev->fw_name);
1042                 goto err_fw_download;
1043         }
1044
1045         /* On downloading the firmware to the target, the USB descriptor of EP4
1046          * is 'patched' to change the type of the endpoint to Bulk. This will
1047          * bring down CPU usage during the scan period.
1048          */
1049         for (idx = 0; idx < alt->desc.bNumEndpoints; idx++) {
1050                 endp = &alt->endpoint[idx].desc;
1051                 if ((endp->bmAttributes & USB_ENDPOINT_XFERTYPE_MASK)
1052                                 == USB_ENDPOINT_XFER_INT) {
1053                         endp->bmAttributes &= ~USB_ENDPOINT_XFERTYPE_MASK;
1054                         endp->bmAttributes |= USB_ENDPOINT_XFER_BULK;
1055                         endp->bInterval = 0;
1056                 }
1057         }
1058
1059         /* Alloc URBs */
1060         ret = ath9k_hif_usb_alloc_urbs(hif_dev);
1061         if (ret) {
1062                 dev_err(&hif_dev->udev->dev,
1063                         "ath9k_htc: Unable to allocate URBs\n");
1064                 goto err_fw_download;
1065         }
1066
1067         return 0;
1068
1069 err_fw_download:
1070         release_firmware(hif_dev->firmware);
1071 err_fw_req:
1072         hif_dev->firmware = NULL;
1073         return ret;
1074 }
1075
1076 static void ath9k_hif_usb_dev_deinit(struct hif_device_usb *hif_dev)
1077 {
1078         ath9k_hif_usb_dealloc_urbs(hif_dev);
1079         if (hif_dev->firmware)
1080                 release_firmware(hif_dev->firmware);
1081 }
1082
1083 /*
1084  * An exact copy of the function from zd1211rw.
1085  */
1086 static int send_eject_command(struct usb_interface *interface)
1087 {
1088         struct usb_device *udev = interface_to_usbdev(interface);
1089         struct usb_host_interface *iface_desc = &interface->altsetting[0];
1090         struct usb_endpoint_descriptor *endpoint;
1091         unsigned char *cmd;
1092         u8 bulk_out_ep;
1093         int r;
1094
1095         /* Find bulk out endpoint */
1096         for (r = 1; r >= 0; r--) {
1097                 endpoint = &iface_desc->endpoint[r].desc;
1098                 if (usb_endpoint_dir_out(endpoint) &&
1099                     usb_endpoint_xfer_bulk(endpoint)) {
1100                         bulk_out_ep = endpoint->bEndpointAddress;
1101                         break;
1102                 }
1103         }
1104         if (r == -1) {
1105                 dev_err(&udev->dev,
1106                         "ath9k_htc: Could not find bulk out endpoint\n");
1107                 return -ENODEV;
1108         }
1109
1110         cmd = kzalloc(31, GFP_KERNEL);
1111         if (cmd == NULL)
1112                 return -ENODEV;
1113
1114         /* USB bulk command block */
1115         cmd[0] = 0x55;  /* bulk command signature */
1116         cmd[1] = 0x53;  /* bulk command signature */
1117         cmd[2] = 0x42;  /* bulk command signature */
1118         cmd[3] = 0x43;  /* bulk command signature */
1119         cmd[14] = 6;    /* command length */
1120
1121         cmd[15] = 0x1b; /* SCSI command: START STOP UNIT */
1122         cmd[19] = 0x2;  /* eject disc */
1123
1124         dev_info(&udev->dev, "Ejecting storage device...\n");
1125         r = usb_bulk_msg(udev, usb_sndbulkpipe(udev, bulk_out_ep),
1126                 cmd, 31, NULL, 2000);
1127         kfree(cmd);
1128         if (r)
1129                 return r;
1130
1131         /* At this point, the device disconnects and reconnects with the real
1132          * ID numbers. */
1133
1134         usb_set_intfdata(interface, NULL);
1135         return 0;
1136 }
1137
1138 static int ath9k_hif_usb_probe(struct usb_interface *interface,
1139                                const struct usb_device_id *id)
1140 {
1141         struct usb_device *udev = interface_to_usbdev(interface);
1142         struct hif_device_usb *hif_dev;
1143         int ret = 0;
1144
1145         if (id->driver_info == STORAGE_DEVICE)
1146                 return send_eject_command(interface);
1147
1148         hif_dev = kzalloc(sizeof(struct hif_device_usb), GFP_KERNEL);
1149         if (!hif_dev) {
1150                 ret = -ENOMEM;
1151                 goto err_alloc;
1152         }
1153
1154         usb_get_dev(udev);
1155         hif_dev->udev = udev;
1156         hif_dev->interface = interface;
1157         hif_dev->device_id = id->idProduct;
1158 #ifdef CONFIG_PM
1159         udev->reset_resume = 1;
1160 #endif
1161         usb_set_intfdata(interface, hif_dev);
1162
1163         hif_dev->htc_handle = ath9k_htc_hw_alloc(hif_dev, &hif_usb,
1164                                                  &hif_dev->udev->dev);
1165         if (hif_dev->htc_handle == NULL) {
1166                 ret = -ENOMEM;
1167                 goto err_htc_hw_alloc;
1168         }
1169
1170         /* Find out which firmware to load */
1171
1172         if (IS_AR7010_DEVICE(id->driver_info))
1173                 hif_dev->fw_name = FIRMWARE_AR7010_1_1;
1174         else
1175                 hif_dev->fw_name = FIRMWARE_AR9271;
1176
1177         ret = ath9k_hif_usb_dev_init(hif_dev, id->driver_info);
1178         if (ret) {
1179                 ret = -EINVAL;
1180                 goto err_hif_init_usb;
1181         }
1182
1183         ret = ath9k_htc_hw_init(hif_dev->htc_handle,
1184                                 &interface->dev, hif_dev->device_id,
1185                                 hif_dev->udev->product, id->driver_info);
1186         if (ret) {
1187                 ret = -EINVAL;
1188                 goto err_htc_hw_init;
1189         }
1190
1191         dev_info(&hif_dev->udev->dev, "ath9k_htc: USB layer initialized\n");
1192
1193         return 0;
1194
1195 err_htc_hw_init:
1196         ath9k_hif_usb_dev_deinit(hif_dev);
1197 err_hif_init_usb:
1198         ath9k_htc_hw_free(hif_dev->htc_handle);
1199 err_htc_hw_alloc:
1200         usb_set_intfdata(interface, NULL);
1201         kfree(hif_dev);
1202         usb_put_dev(udev);
1203 err_alloc:
1204         return ret;
1205 }
1206
1207 static void ath9k_hif_usb_reboot(struct usb_device *udev)
1208 {
1209         u32 reboot_cmd = 0xffffffff;
1210         void *buf;
1211         int ret;
1212
1213         buf = kmemdup(&reboot_cmd, 4, GFP_KERNEL);
1214         if (!buf)
1215                 return;
1216
1217         ret = usb_bulk_msg(udev, usb_sndbulkpipe(udev, USB_REG_OUT_PIPE),
1218                            buf, 4, NULL, HZ);
1219         if (ret)
1220                 dev_err(&udev->dev, "ath9k_htc: USB reboot failed\n");
1221
1222         kfree(buf);
1223 }
1224
1225 static void ath9k_hif_usb_disconnect(struct usb_interface *interface)
1226 {
1227         struct usb_device *udev = interface_to_usbdev(interface);
1228         struct hif_device_usb *hif_dev = usb_get_intfdata(interface);
1229         bool unplugged = (udev->state == USB_STATE_NOTATTACHED) ? true : false;
1230
1231         if (!hif_dev)
1232                 return;
1233
1234         ath9k_htc_hw_deinit(hif_dev->htc_handle, unplugged);
1235         ath9k_htc_hw_free(hif_dev->htc_handle);
1236         ath9k_hif_usb_dev_deinit(hif_dev);
1237         usb_set_intfdata(interface, NULL);
1238
1239         if (!unplugged && (hif_dev->flags & HIF_USB_START))
1240                 ath9k_hif_usb_reboot(udev);
1241
1242         kfree(hif_dev);
1243         dev_info(&udev->dev, "ath9k_htc: USB layer deinitialized\n");
1244         usb_put_dev(udev);
1245 }
1246
1247 #ifdef CONFIG_PM
1248 static int ath9k_hif_usb_suspend(struct usb_interface *interface,
1249                                  pm_message_t message)
1250 {
1251         struct hif_device_usb *hif_dev = usb_get_intfdata(interface);
1252
1253         /*
1254          * The device has to be set to FULLSLEEP mode in case no
1255          * interface is up.
1256          */
1257         if (!(hif_dev->flags & HIF_USB_START))
1258                 ath9k_htc_suspend(hif_dev->htc_handle);
1259
1260         ath9k_hif_usb_dealloc_urbs(hif_dev);
1261
1262         return 0;
1263 }
1264
1265 static int ath9k_hif_usb_resume(struct usb_interface *interface)
1266 {
1267         struct hif_device_usb *hif_dev = usb_get_intfdata(interface);
1268         struct htc_target *htc_handle = hif_dev->htc_handle;
1269         int ret;
1270
1271         ret = ath9k_hif_usb_alloc_urbs(hif_dev);
1272         if (ret)
1273                 return ret;
1274
1275         if (hif_dev->firmware) {
1276                 ret = ath9k_hif_usb_download_fw(hif_dev,
1277                                 htc_handle->drv_priv->ah->hw_version.usbdev);
1278                 if (ret)
1279                         goto fail_resume;
1280         } else {
1281                 ath9k_hif_usb_dealloc_urbs(hif_dev);
1282                 return -EIO;
1283         }
1284
1285         mdelay(100);
1286
1287         ret = ath9k_htc_resume(htc_handle);
1288
1289         if (ret)
1290                 goto fail_resume;
1291
1292         return 0;
1293
1294 fail_resume:
1295         ath9k_hif_usb_dealloc_urbs(hif_dev);
1296
1297         return ret;
1298 }
1299 #endif
1300
1301 static struct usb_driver ath9k_hif_usb_driver = {
1302         .name = KBUILD_MODNAME,
1303         .probe = ath9k_hif_usb_probe,
1304         .disconnect = ath9k_hif_usb_disconnect,
1305 #ifdef CONFIG_PM
1306         .suspend = ath9k_hif_usb_suspend,
1307         .resume = ath9k_hif_usb_resume,
1308         .reset_resume = ath9k_hif_usb_resume,
1309 #endif
1310         .id_table = ath9k_hif_usb_ids,
1311         .soft_unbind = 1,
1312 };
1313
1314 int ath9k_hif_usb_init(void)
1315 {
1316         return usb_register(&ath9k_hif_usb_driver);
1317 }
1318
1319 void ath9k_hif_usb_exit(void)
1320 {
1321         usb_deregister(&ath9k_hif_usb_driver);
1322 }