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