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