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         { USB_DEVICE(0x057c, 0x8403) }, /* AVM FRITZ!WLAN 11N v2 USB */
  41
  42         { USB_DEVICE(0x0cf3, 0x7015),
  43           .driver_info = AR9287_USB },  /* Atheros */
  44         { USB_DEVICE(0x1668, 0x1200),
  45           .driver_info = AR9287_USB },  /* Verizon */
  46
  47         { USB_DEVICE(0x0cf3, 0x7010),
  48           .driver_info = AR9280_USB },  /* Atheros */
  49         { USB_DEVICE(0x0846, 0x9018),
  50           .driver_info = AR9280_USB },  /* Netgear WNDA3200 */
  51         { USB_DEVICE(0x083A, 0xA704),
  52           .driver_info = AR9280_USB },  /* SMC Networks */
  53
  54         { USB_DEVICE(0x0cf3, 0x20ff),
  55           .driver_info = STORAGE_DEVICE },
  56
  57         { },
  58 };
  59
  60 MODULE_DEVICE_TABLE(usb, ath9k_hif_usb_ids);
  61
  62 static int __hif_usb_tx(struct hif_device_usb *hif_dev);
  63
  64 static void hif_usb_regout_cb(struct urb *urb)
  65 {
  66         struct cmd_buf *cmd = (struct cmd_buf *)urb->context;
  67
  68         switch (urb->status) {
  69         case 0:
  70                 break;
  71         case -ENOENT:
  72         case -ECONNRESET:
  73         case -ENODEV:
  74         case -ESHUTDOWN:
  75                 goto free;
  76         default:
  77                 break;
  78         }
  79
  80         if (cmd) {
  81                 ath9k_htc_txcompletion_cb(cmd->hif_dev->htc_handle,
  82                                           cmd->skb, true);
  83                 kfree(cmd);
  84         }
  85
  86         return;
  87 free:
  88         kfree_skb(cmd->skb);
  89         kfree(cmd);
  90 }
  91
  92 static int hif_usb_send_regout(struct hif_device_usb *hif_dev,
  93                                struct sk_buff *skb)
  94 {
  95         struct urb *urb;
  96         struct cmd_buf *cmd;
  97         int ret = 0;
  98
  99         urb = usb_alloc_urb(0, GFP_KERNEL);
 100         if (urb == NULL)
 101                 return -ENOMEM;
 102
 103         cmd = kzalloc(sizeof(*cmd), GFP_KERNEL);
 104         if (cmd == NULL) {
 105                 usb_free_urb(urb);
 106                 return -ENOMEM;
 107         }
 108
 109         cmd->skb = skb;
 110         cmd->hif_dev = hif_dev;
 111
 112         usb_fill_bulk_urb(urb, hif_dev->udev,
 113                          usb_sndbulkpipe(hif_dev->udev, USB_REG_OUT_PIPE),
 114                          skb->data, skb->len,
 115                          hif_usb_regout_cb, cmd);
 116
 117         usb_anchor_urb(urb, &hif_dev->regout_submitted);
 118         ret = usb_submit_urb(urb, GFP_KERNEL);
 119         if (ret) {
 120                 usb_unanchor_urb(urb);
 121                 kfree(cmd);
 122         }
 123         usb_free_urb(urb);
 124
 125         return ret;
 126 }
 127
 128 static void hif_usb_mgmt_cb(struct urb *urb)
 129 {
 130         struct cmd_buf *cmd = (struct cmd_buf *)urb->context;
 131         struct hif_device_usb *hif_dev = cmd->hif_dev;
 132         bool txok = true;
 133
 134         if (!cmd || !cmd->skb || !cmd->hif_dev)
 135                 return;
 136
 137         switch (urb->status) {
 138         case 0:
 139                 break;
 140         case -ENOENT:
 141         case -ECONNRESET:
 142         case -ENODEV:
 143         case -ESHUTDOWN:
 144                 txok = false;
 145
 146                 /*
 147                  * If the URBs are being flushed, no need to complete
 148                  * this packet.
 149                  */
 150                 spin_lock(&hif_dev->tx.tx_lock);
 151                 if (hif_dev->tx.flags & HIF_USB_TX_FLUSH) {
 152                         spin_unlock(&hif_dev->tx.tx_lock);
 153                         dev_kfree_skb_any(cmd->skb);
 154                         kfree(cmd);
 155                         return;
 156                 }
 157                 spin_unlock(&hif_dev->tx.tx_lock);
 158
 159                 break;
 160         default:
 161                 txok = false;
 162                 break;
 163         }
 164
 165         skb_pull(cmd->skb, 4);
 166         ath9k_htc_txcompletion_cb(cmd->hif_dev->htc_handle,
 167                                   cmd->skb, txok);
 168         kfree(cmd);
 169 }
 170
 171 static int hif_usb_send_mgmt(struct hif_device_usb *hif_dev,
 172                              struct sk_buff *skb)
 173 {
 174         struct urb *urb;
 175         struct cmd_buf *cmd;
 176         int ret = 0;
 177         __le16 *hdr;
 178
 179         urb = usb_alloc_urb(0, GFP_ATOMIC);
 180         if (urb == NULL)
 181                 return -ENOMEM;
 182
 183         cmd = kzalloc(sizeof(*cmd), GFP_ATOMIC);
 184         if (cmd == NULL) {
 185                 usb_free_urb(urb);
 186                 return -ENOMEM;
 187         }
 188
 189         cmd->skb = skb;
 190         cmd->hif_dev = hif_dev;
 191
 192         hdr = (__le16 *) skb_push(skb, 4);
 193         *hdr++ = cpu_to_le16(skb->len - 4);
 194         *hdr++ = cpu_to_le16(ATH_USB_TX_STREAM_MODE_TAG);
 195
 196         usb_fill_bulk_urb(urb, hif_dev->udev,
 197                          usb_sndbulkpipe(hif_dev->udev, USB_WLAN_TX_PIPE),
 198                          skb->data, skb->len,
 199                          hif_usb_mgmt_cb, cmd);
 200
 201         usb_anchor_urb(urb, &hif_dev->mgmt_submitted);
 202         ret = usb_submit_urb(urb, GFP_ATOMIC);
 203         if (ret) {
 204                 usb_unanchor_urb(urb);
 205                 kfree(cmd);
 206         }
 207         usb_free_urb(urb);
 208
 209         return ret;
 210 }
 211
 212 static inline void ath9k_skb_queue_purge(struct hif_device_usb *hif_dev,
 213                                          struct sk_buff_head *list)
 214 {
 215         struct sk_buff *skb;
 216
 217         while ((skb = __skb_dequeue(list)) != NULL) {
 218                 dev_kfree_skb_any(skb);
 219         }
 220 }
 221
 222 static inline void ath9k_skb_queue_complete(struct hif_device_usb *hif_dev,
 223                                             struct sk_buff_head *queue,
 224                                             bool txok)
 225 {
 226         struct sk_buff *skb;
 227
 228         while ((skb = __skb_dequeue(queue)) != NULL) {
 229                 ath9k_htc_txcompletion_cb(hif_dev->htc_handle,
 230                                           skb, txok);
 231                 if (txok)
 232                         TX_STAT_INC(skb_success);
 233                 else
 234                         TX_STAT_INC(skb_failed);
 235         }
 236 }
 237
 238 static void hif_usb_tx_cb(struct urb *urb)
 239 {
 240         struct tx_buf *tx_buf = (struct tx_buf *) urb->context;
 241         struct hif_device_usb *hif_dev;
 242         bool txok = true;
 243
 244         if (!tx_buf || !tx_buf->hif_dev)
 245                 return;
 246
 247         hif_dev = tx_buf->hif_dev;
 248
 249         switch (urb->status) {
 250         case 0:
 251                 break;
 252         case -ENOENT:
 253         case -ECONNRESET:
 254         case -ENODEV:
 255         case -ESHUTDOWN:
 256                 txok = false;
 257
 258                 /*
 259                  * If the URBs are being flushed, no need to add this
 260                  * URB to the free list.
 261                  */
 262                 spin_lock(&hif_dev->tx.tx_lock);
 263                 if (hif_dev->tx.flags & HIF_USB_TX_FLUSH) {
 264                         spin_unlock(&hif_dev->tx.tx_lock);
 265                         ath9k_skb_queue_purge(hif_dev, &tx_buf->skb_queue);
 266                         return;
 267                 }
 268                 spin_unlock(&hif_dev->tx.tx_lock);
 269
 270                 break;
 271         default:
 272                 txok = false;
 273                 break;
 274         }
 275
 276         ath9k_skb_queue_complete(hif_dev, &tx_buf->skb_queue, txok);
 277
 278         /* Re-initialize the SKB queue */
 279         tx_buf->len = tx_buf->offset = 0;
 280         __skb_queue_head_init(&tx_buf->skb_queue);
 281
 282         /* Add this TX buffer to the free list */
 283         spin_lock(&hif_dev->tx.tx_lock);
 284         list_move_tail(&tx_buf->list, &hif_dev->tx.tx_buf);
 285         hif_dev->tx.tx_buf_cnt++;
 286         if (!(hif_dev->tx.flags & HIF_USB_TX_STOP))
 287                 __hif_usb_tx(hif_dev); /* Check for pending SKBs */
 288         TX_STAT_INC(buf_completed);
 289         spin_unlock(&hif_dev->tx.tx_lock);
 290 }
 291
 292 /* TX lock has to be taken */
 293 static int __hif_usb_tx(struct hif_device_usb *hif_dev)
 294 {
 295         struct tx_buf *tx_buf = NULL;
 296         struct sk_buff *nskb = NULL;
 297         int ret = 0, i;
 298         u16 tx_skb_cnt = 0;
 299         u8 *buf;
 300         __le16 *hdr;
 301
 302         if (hif_dev->tx.tx_skb_cnt == 0)
 303                 return 0;
 304
 305         /* Check if a free TX buffer is available */
 306         if (list_empty(&hif_dev->tx.tx_buf))
 307                 return 0;
 308
 309         tx_buf = list_first_entry(&hif_dev->tx.tx_buf, struct tx_buf, list);
 310         list_move_tail(&tx_buf->list, &hif_dev->tx.tx_pending);
 311         hif_dev->tx.tx_buf_cnt--;
 312
 313         tx_skb_cnt = min_t(u16, hif_dev->tx.tx_skb_cnt, MAX_TX_AGGR_NUM);
 314
 315         for (i = 0; i < tx_skb_cnt; i++) {
 316                 nskb = __skb_dequeue(&hif_dev->tx.tx_skb_queue);
 317
 318                 /* Should never be NULL */
 319                 BUG_ON(!nskb);
 320
 321                 hif_dev->tx.tx_skb_cnt--;
 322
 323                 buf = tx_buf->buf;
 324                 buf += tx_buf->offset;
 325                 hdr = (__le16 *)buf;
 326                 *hdr++ = cpu_to_le16(nskb->len);
 327                 *hdr++ = cpu_to_le16(ATH_USB_TX_STREAM_MODE_TAG);
 328                 buf += 4;
 329                 memcpy(buf, nskb->data, nskb->len);
 330                 tx_buf->len = nskb->len + 4;
 331
 332                 if (i < (tx_skb_cnt - 1))
 333                         tx_buf->offset += (((tx_buf->len - 1) / 4) + 1) * 4;
 334
 335                 if (i == (tx_skb_cnt - 1))
 336                         tx_buf->len += tx_buf->offset;
 337
 338                 __skb_queue_tail(&tx_buf->skb_queue, nskb);
 339                 TX_STAT_INC(skb_queued);
 340         }
 341
 342         usb_fill_bulk_urb(tx_buf->urb, hif_dev->udev,
 343                           usb_sndbulkpipe(hif_dev->udev, USB_WLAN_TX_PIPE),
 344                           tx_buf->buf, tx_buf->len,
 345                           hif_usb_tx_cb, tx_buf);
 346
 347         ret = usb_submit_urb(tx_buf->urb, GFP_ATOMIC);
 348         if (ret) {
 349                 tx_buf->len = tx_buf->offset = 0;
 350                 ath9k_skb_queue_complete(hif_dev, &tx_buf->skb_queue, false);
 351                 __skb_queue_head_init(&tx_buf->skb_queue);
 352                 list_move_tail(&tx_buf->list, &hif_dev->tx.tx_buf);
 353                 hif_dev->tx.tx_buf_cnt++;
 354         }
 355
 356         if (!ret)
 357                 TX_STAT_INC(buf_queued);
 358
 359         return ret;
 360 }
 361
 362 static int hif_usb_send_tx(struct hif_device_usb *hif_dev, struct sk_buff *skb)
 363 {
 364         struct ath9k_htc_tx_ctl *tx_ctl;
 365         unsigned long flags;
 366         int ret = 0;
 367
 368         spin_lock_irqsave(&hif_dev->tx.tx_lock, flags);
 369
 370         if (hif_dev->tx.flags & HIF_USB_TX_STOP) {
 371                 spin_unlock_irqrestore(&hif_dev->tx.tx_lock, flags);
 372                 return -ENODEV;
 373         }
 374
 375         /* Check if the max queue count has been reached */
 376         if (hif_dev->tx.tx_skb_cnt > MAX_TX_BUF_NUM) {
 377                 spin_unlock_irqrestore(&hif_dev->tx.tx_lock, flags);
 378                 return -ENOMEM;
 379         }
 380
 381         spin_unlock_irqrestore(&hif_dev->tx.tx_lock, flags);
 382
 383         tx_ctl = HTC_SKB_CB(skb);
 384
 385         /* Mgmt/Beacon frames don't use the TX buffer pool */
 386         if ((tx_ctl->type == ATH9K_HTC_MGMT) ||
 387             (tx_ctl->type == ATH9K_HTC_BEACON)) {
 388                 ret = hif_usb_send_mgmt(hif_dev, skb);
 389         }
 390
 391         spin_lock_irqsave(&hif_dev->tx.tx_lock, flags);
 392
 393         if ((tx_ctl->type == ATH9K_HTC_NORMAL) ||
 394             (tx_ctl->type == ATH9K_HTC_AMPDU)) {
 395                 __skb_queue_tail(&hif_dev->tx.tx_skb_queue, skb);
 396                 hif_dev->tx.tx_skb_cnt++;
 397         }
 398
 399         /* Check if AMPDUs have to be sent immediately */
 400         if ((hif_dev->tx.tx_buf_cnt == MAX_TX_URB_NUM) &&
 401             (hif_dev->tx.tx_skb_cnt < 2)) {
 402                 __hif_usb_tx(hif_dev);
 403         }
 404
 405         spin_unlock_irqrestore(&hif_dev->tx.tx_lock, flags);
 406
 407         return ret;
 408 }
 409
 410 static void hif_usb_start(void *hif_handle)
 411 {
 412         struct hif_device_usb *hif_dev = (struct hif_device_usb *)hif_handle;
 413         unsigned long flags;
 414
 415         hif_dev->flags |= HIF_USB_START;
 416
 417         spin_lock_irqsave(&hif_dev->tx.tx_lock, flags);
 418         hif_dev->tx.flags &= ~HIF_USB_TX_STOP;
 419         spin_unlock_irqrestore(&hif_dev->tx.tx_lock, flags);
 420 }
 421
 422 static void hif_usb_stop(void *hif_handle)
 423 {
 424         struct hif_device_usb *hif_dev = (struct hif_device_usb *)hif_handle;
 425         struct tx_buf *tx_buf = NULL, *tx_buf_tmp = NULL;
 426         unsigned long flags;
 427
 428         spin_lock_irqsave(&hif_dev->tx.tx_lock, flags);
 429         ath9k_skb_queue_complete(hif_dev, &hif_dev->tx.tx_skb_queue, false);
 430         hif_dev->tx.tx_skb_cnt = 0;
 431         hif_dev->tx.flags |= HIF_USB_TX_STOP;
 432         spin_unlock_irqrestore(&hif_dev->tx.tx_lock, flags);
 433
 434         /* The pending URBs have to be canceled. */
 435         list_for_each_entry_safe(tx_buf, tx_buf_tmp,
 436                                  &hif_dev->tx.tx_pending, list) {
 437                 usb_kill_urb(tx_buf->urb);
 438         }
 439
 440         usb_kill_anchored_urbs(&hif_dev->mgmt_submitted);
 441 }
 442
 443 static int hif_usb_send(void *hif_handle, u8 pipe_id, struct sk_buff *skb)
 444 {
 445         struct hif_device_usb *hif_dev = (struct hif_device_usb *)hif_handle;
 446         int ret = 0;
 447
 448         switch (pipe_id) {
 449         case USB_WLAN_TX_PIPE:
 450                 ret = hif_usb_send_tx(hif_dev, skb);
 451                 break;
 452         case USB_REG_OUT_PIPE:
 453                 ret = hif_usb_send_regout(hif_dev, skb);
 454                 break;
 455         default:
 456                 dev_err(&hif_dev->udev->dev,
 457                         "ath9k_htc: Invalid TX pipe: %d\n", pipe_id);
 458                 ret = -EINVAL;
 459                 break;
 460         }
 461
 462         return ret;
 463 }
 464
 465 static inline bool check_index(struct sk_buff *skb, u8 idx)
 466 {
 467         struct ath9k_htc_tx_ctl *tx_ctl;
 468
 469         tx_ctl = HTC_SKB_CB(skb);
 470
 471         if ((tx_ctl->type == ATH9K_HTC_AMPDU) &&
 472             (tx_ctl->sta_idx == idx))
 473                 return true;
 474
 475         return false;
 476 }
 477
 478 static void hif_usb_sta_drain(void *hif_handle, u8 idx)
 479 {
 480         struct hif_device_usb *hif_dev = (struct hif_device_usb *)hif_handle;
 481         struct sk_buff *skb, *tmp;
 482         unsigned long flags;
 483
 484         spin_lock_irqsave(&hif_dev->tx.tx_lock, flags);
 485
 486         skb_queue_walk_safe(&hif_dev->tx.tx_skb_queue, skb, tmp) {
 487                 if (check_index(skb, idx)) {
 488                         __skb_unlink(skb, &hif_dev->tx.tx_skb_queue);
 489                         ath9k_htc_txcompletion_cb(hif_dev->htc_handle,
 490                                                   skb, false);
 491                         hif_dev->tx.tx_skb_cnt--;
 492                         TX_STAT_INC(skb_failed);
 493                 }
 494         }
 495
 496         spin_unlock_irqrestore(&hif_dev->tx.tx_lock, flags);
 497 }
 498
 499 static struct ath9k_htc_hif hif_usb = {
 500         .transport = ATH9K_HIF_USB,
 501         .name = "ath9k_hif_usb",
 502
 503         .control_ul_pipe = USB_REG_OUT_PIPE,
 504         .control_dl_pipe = USB_REG_IN_PIPE,
 505
 506         .start = hif_usb_start,
 507         .stop = hif_usb_stop,
 508         .sta_drain = hif_usb_sta_drain,
 509         .send = hif_usb_send,
 510 };
 511
 512 static void ath9k_hif_usb_rx_stream(struct hif_device_usb *hif_dev,
 513                                     struct sk_buff *skb)
 514 {
 515         struct sk_buff *nskb, *skb_pool[MAX_PKT_NUM_IN_TRANSFER];
 516         int index = 0, i = 0, len = skb->len;
 517         int rx_remain_len, rx_pkt_len;
 518         u16 pool_index = 0;
 519         u8 *ptr;
 520
 521         spin_lock(&hif_dev->rx_lock);
 522
 523         rx_remain_len = hif_dev->rx_remain_len;
 524         rx_pkt_len = hif_dev->rx_transfer_len;
 525
 526         if (rx_remain_len != 0) {
 527                 struct sk_buff *remain_skb = hif_dev->remain_skb;
 528
 529                 if (remain_skb) {
 530                         ptr = (u8 *) remain_skb->data;
 531
 532                         index = rx_remain_len;
 533                         rx_remain_len -= hif_dev->rx_pad_len;
 534                         ptr += rx_pkt_len;
 535
 536                         memcpy(ptr, skb->data, rx_remain_len);
 537
 538                         rx_pkt_len += rx_remain_len;
 539                         hif_dev->rx_remain_len = 0;
 540                         skb_put(remain_skb, rx_pkt_len);
 541
 542                         skb_pool[pool_index++] = remain_skb;
 543
 544                 } else {
 545                         index = rx_remain_len;
 546                 }
 547         }
 548
 549         spin_unlock(&hif_dev->rx_lock);
 550
 551         while (index < len) {
 552                 u16 pkt_len;
 553                 u16 pkt_tag;
 554                 u16 pad_len;
 555                 int chk_idx;
 556
 557                 ptr = (u8 *) skb->data;
 558
 559                 pkt_len = ptr[index] + (ptr[index+1] << 8);
 560                 pkt_tag = ptr[index+2] + (ptr[index+3] << 8);
 561
 562                 if (pkt_tag != ATH_USB_RX_STREAM_MODE_TAG) {
 563                         RX_STAT_INC(skb_dropped);
 564                         return;
 565                 }
 566
 567                 pad_len = 4 - (pkt_len & 0x3);
 568                 if (pad_len == 4)
 569                         pad_len = 0;
 570
 571                 chk_idx = index;
 572                 index = index + 4 + pkt_len + pad_len;
 573
 574                 if (index > MAX_RX_BUF_SIZE) {
 575                         spin_lock(&hif_dev->rx_lock);
 576                         hif_dev->rx_remain_len = index - MAX_RX_BUF_SIZE;
 577                         hif_dev->rx_transfer_len =
 578                                 MAX_RX_BUF_SIZE - chk_idx - 4;
 579                         hif_dev->rx_pad_len = pad_len;
 580
 581                         nskb = __dev_alloc_skb(pkt_len + 32, GFP_ATOMIC);
 582                         if (!nskb) {
 583                                 dev_err(&hif_dev->udev->dev,
 584                                         "ath9k_htc: RX memory allocation error\n");
 585                                 spin_unlock(&hif_dev->rx_lock);
 586                                 goto err;
 587                         }
 588                         skb_reserve(nskb, 32);
 589                         RX_STAT_INC(skb_allocated);
 590
 591                         memcpy(nskb->data, &(skb->data[chk_idx+4]),
 592                                hif_dev->rx_transfer_len);
 593
 594                         /* Record the buffer pointer */
 595                         hif_dev->remain_skb = nskb;
 596                         spin_unlock(&hif_dev->rx_lock);
 597                 } else {
 598                         nskb = __dev_alloc_skb(pkt_len + 32, GFP_ATOMIC);
 599                         if (!nskb) {
 600                                 dev_err(&hif_dev->udev->dev,
 601                                         "ath9k_htc: RX memory allocation error\n");
 602                                 goto err;
 603                         }
 604                         skb_reserve(nskb, 32);
 605                         RX_STAT_INC(skb_allocated);
 606
 607                         memcpy(nskb->data, &(skb->data[chk_idx+4]), pkt_len);
 608                         skb_put(nskb, pkt_len);
 609                         skb_pool[pool_index++] = nskb;
 610                 }
 611         }
 612
 613 err:
 614         for (i = 0; i < pool_index; i++) {
 615                 ath9k_htc_rx_msg(hif_dev->htc_handle, skb_pool[i],
 616                                  skb_pool[i]->len, USB_WLAN_RX_PIPE);
 617                 RX_STAT_INC(skb_completed);
 618         }
 619 }
 620
 621 static void ath9k_hif_usb_rx_cb(struct urb *urb)
 622 {
 623         struct sk_buff *skb = (struct sk_buff *) urb->context;
 624         struct hif_device_usb *hif_dev =
 625                 usb_get_intfdata(usb_ifnum_to_if(urb->dev, 0));
 626         int ret;
 627
 628         if (!skb)
 629                 return;
 630
 631         if (!hif_dev)
 632                 goto free;
 633
 634         switch (urb->status) {
 635         case 0:
 636                 break;
 637         case -ENOENT:
 638         case -ECONNRESET:
 639         case -ENODEV:
 640         case -ESHUTDOWN:
 641                 goto free;
 642         default:
 643                 goto resubmit;
 644         }
 645
 646         if (likely(urb->actual_length != 0)) {
 647                 skb_put(skb, urb->actual_length);
 648                 ath9k_hif_usb_rx_stream(hif_dev, skb);
 649         }
 650
 651 resubmit:
 652         skb_reset_tail_pointer(skb);
 653         skb_trim(skb, 0);
 654
 655         usb_anchor_urb(urb, &hif_dev->rx_submitted);
 656         ret = usb_submit_urb(urb, GFP_ATOMIC);
 657         if (ret) {
 658                 usb_unanchor_urb(urb);
 659                 goto free;
 660         }
 661
 662         return;
 663 free:
 664         kfree_skb(skb);
 665 }
 666
 667 static void ath9k_hif_usb_reg_in_cb(struct urb *urb)
 668 {
 669         struct sk_buff *skb = (struct sk_buff *) urb->context;
 670         struct sk_buff *nskb;
 671         struct hif_device_usb *hif_dev =
 672                 usb_get_intfdata(usb_ifnum_to_if(urb->dev, 0));
 673         int ret;
 674
 675         if (!skb)
 676                 return;
 677
 678         if (!hif_dev)
 679                 goto free;
 680
 681         switch (urb->status) {
 682         case 0:
 683                 break;
 684         case -ENOENT:
 685         case -ECONNRESET:
 686         case -ENODEV:
 687         case -ESHUTDOWN:
 688                 goto free;
 689         default:
 690                 skb_reset_tail_pointer(skb);
 691                 skb_trim(skb, 0);
 692
 693                 goto resubmit;
 694         }
 695
 696         if (likely(urb->actual_length != 0)) {
 697                 skb_put(skb, urb->actual_length);
 698
 699                 /* Process the command first */
 700                 ath9k_htc_rx_msg(hif_dev->htc_handle, skb,
 701                                  skb->len, USB_REG_IN_PIPE);
 702
 703
 704                 nskb = alloc_skb(MAX_REG_IN_BUF_SIZE, GFP_ATOMIC);
 705                 if (!nskb) {
 706                         dev_err(&hif_dev->udev->dev,
 707                                 "ath9k_htc: REG_IN memory allocation failure\n");
 708                         urb->context = NULL;
 709                         return;
 710                 }
 711
 712                 usb_fill_bulk_urb(urb, hif_dev->udev,
 713                                  usb_rcvbulkpipe(hif_dev->udev,
 714                                                  USB_REG_IN_PIPE),
 715                                  nskb->data, MAX_REG_IN_BUF_SIZE,
 716                                  ath9k_hif_usb_reg_in_cb, nskb);
 717         }
 718
 719 resubmit:
 720         usb_anchor_urb(urb, &hif_dev->reg_in_submitted);
 721         ret = usb_submit_urb(urb, GFP_ATOMIC);
 722         if (ret) {
 723                 usb_unanchor_urb(urb);
 724                 goto free;
 725         }
 726
 727         return;
 728 free:
 729         kfree_skb(skb);
 730         urb->context = NULL;
 731 }
 732
 733 static void ath9k_hif_usb_dealloc_tx_urbs(struct hif_device_usb *hif_dev)
 734 {
 735         struct tx_buf *tx_buf = NULL, *tx_buf_tmp = NULL;
 736         unsigned long flags;
 737
 738         list_for_each_entry_safe(tx_buf, tx_buf_tmp,
 739                                  &hif_dev->tx.tx_buf, list) {
 740                 usb_kill_urb(tx_buf->urb);
 741                 list_del(&tx_buf->list);
 742                 usb_free_urb(tx_buf->urb);
 743                 kfree(tx_buf->buf);
 744                 kfree(tx_buf);
 745         }
 746
 747         spin_lock_irqsave(&hif_dev->tx.tx_lock, flags);
 748         hif_dev->tx.flags |= HIF_USB_TX_FLUSH;
 749         spin_unlock_irqrestore(&hif_dev->tx.tx_lock, flags);
 750
 751         list_for_each_entry_safe(tx_buf, tx_buf_tmp,
 752                                  &hif_dev->tx.tx_pending, list) {
 753                 usb_kill_urb(tx_buf->urb);
 754                 list_del(&tx_buf->list);
 755                 usb_free_urb(tx_buf->urb);
 756                 kfree(tx_buf->buf);
 757                 kfree(tx_buf);
 758         }
 759
 760         usb_kill_anchored_urbs(&hif_dev->mgmt_submitted);
 761 }
 762
 763 static int ath9k_hif_usb_alloc_tx_urbs(struct hif_device_usb *hif_dev)
 764 {
 765         struct tx_buf *tx_buf;
 766         int i;
 767
 768         INIT_LIST_HEAD(&hif_dev->tx.tx_buf);
 769         INIT_LIST_HEAD(&hif_dev->tx.tx_pending);
 770         spin_lock_init(&hif_dev->tx.tx_lock);
 771         __skb_queue_head_init(&hif_dev->tx.tx_skb_queue);
 772         init_usb_anchor(&hif_dev->mgmt_submitted);
 773
 774         for (i = 0; i < MAX_TX_URB_NUM; i++) {
 775                 tx_buf = kzalloc(sizeof(struct tx_buf), GFP_KERNEL);
 776                 if (!tx_buf)
 777                         goto err;
 778
 779                 tx_buf->buf = kzalloc(MAX_TX_BUF_SIZE, GFP_KERNEL);
 780                 if (!tx_buf->buf)
 781                         goto err;
 782
 783                 tx_buf->urb = usb_alloc_urb(0, GFP_KERNEL);
 784                 if (!tx_buf->urb)
 785                         goto err;
 786
 787                 tx_buf->hif_dev = hif_dev;
 788                 __skb_queue_head_init(&tx_buf->skb_queue);
 789
 790                 list_add_tail(&tx_buf->list, &hif_dev->tx.tx_buf);
 791         }
 792
 793         hif_dev->tx.tx_buf_cnt = MAX_TX_URB_NUM;
 794
 795         return 0;
 796 err:
 797         if (tx_buf) {
 798                 kfree(tx_buf->buf);
 799                 kfree(tx_buf);
 800         }
 801         ath9k_hif_usb_dealloc_tx_urbs(hif_dev);
 802         return -ENOMEM;
 803 }
 804
 805 static void ath9k_hif_usb_dealloc_rx_urbs(struct hif_device_usb *hif_dev)
 806 {
 807         usb_kill_anchored_urbs(&hif_dev->rx_submitted);
 808 }
 809
 810 static int ath9k_hif_usb_alloc_rx_urbs(struct hif_device_usb *hif_dev)
 811 {
 812         struct urb *urb = NULL;
 813         struct sk_buff *skb = NULL;
 814         int i, ret;
 815
 816         init_usb_anchor(&hif_dev->rx_submitted);
 817         spin_lock_init(&hif_dev->rx_lock);
 818
 819         for (i = 0; i < MAX_RX_URB_NUM; i++) {
 820
 821                 /* Allocate URB */
 822                 urb = usb_alloc_urb(0, GFP_KERNEL);
 823                 if (urb == NULL) {
 824                         ret = -ENOMEM;
 825                         goto err_urb;
 826                 }
 827
 828                 /* Allocate buffer */
 829                 skb = alloc_skb(MAX_RX_BUF_SIZE, GFP_KERNEL);
 830                 if (!skb) {
 831                         ret = -ENOMEM;
 832                         goto err_skb;
 833                 }
 834
 835                 usb_fill_bulk_urb(urb, hif_dev->udev,
 836                                   usb_rcvbulkpipe(hif_dev->udev,
 837                                                   USB_WLAN_RX_PIPE),
 838                                   skb->data, MAX_RX_BUF_SIZE,
 839                                   ath9k_hif_usb_rx_cb, skb);
 840
 841                 /* Anchor URB */
 842                 usb_anchor_urb(urb, &hif_dev->rx_submitted);
 843
 844                 /* Submit URB */
 845                 ret = usb_submit_urb(urb, GFP_KERNEL);
 846                 if (ret) {
 847                         usb_unanchor_urb(urb);
 848                         goto err_submit;
 849                 }
 850
 851                 /*
 852                  * Drop reference count.
 853                  * This ensures that the URB is freed when killing them.
 854                  */
 855                 usb_free_urb(urb);
 856         }
 857
 858         return 0;
 859
 860 err_submit:
 861         kfree_skb(skb);
 862 err_skb:
 863         usb_free_urb(urb);
 864 err_urb:
 865         ath9k_hif_usb_dealloc_rx_urbs(hif_dev);
 866         return ret;
 867 }
 868
 869 static void ath9k_hif_usb_dealloc_reg_in_urbs(struct hif_device_usb *hif_dev)
 870 {
 871         usb_kill_anchored_urbs(&hif_dev->reg_in_submitted);
 872 }
 873
 874 static int ath9k_hif_usb_alloc_reg_in_urbs(struct hif_device_usb *hif_dev)
 875 {
 876         struct urb *urb = NULL;
 877         struct sk_buff *skb = NULL;
 878         int i, ret;
 879
 880         init_usb_anchor(&hif_dev->reg_in_submitted);
 881
 882         for (i = 0; i < MAX_REG_IN_URB_NUM; i++) {
 883
 884                 /* Allocate URB */
 885                 urb = usb_alloc_urb(0, GFP_KERNEL);
 886                 if (urb == NULL) {
 887                         ret = -ENOMEM;
 888                         goto err_urb;
 889                 }
 890
 891                 /* Allocate buffer */
 892                 skb = alloc_skb(MAX_REG_IN_BUF_SIZE, GFP_KERNEL);
 893                 if (!skb) {
 894                         ret = -ENOMEM;
 895                         goto err_skb;
 896                 }
 897
 898                 usb_fill_bulk_urb(urb, hif_dev->udev,
 899                                   usb_rcvbulkpipe(hif_dev->udev,
 900                                                   USB_REG_IN_PIPE),
 901                                   skb->data, MAX_REG_IN_BUF_SIZE,
 902                                   ath9k_hif_usb_reg_in_cb, skb);
 903
 904                 /* Anchor URB */
 905                 usb_anchor_urb(urb, &hif_dev->reg_in_submitted);
 906
 907                 /* Submit URB */
 908                 ret = usb_submit_urb(urb, GFP_KERNEL);
 909                 if (ret) {
 910                         usb_unanchor_urb(urb);
 911                         goto err_submit;
 912                 }
 913
 914                 /*
 915                  * Drop reference count.
 916                  * This ensures that the URB is freed when killing them.
 917                  */
 918                 usb_free_urb(urb);
 919         }
 920
 921         return 0;
 922
 923 err_submit:
 924         kfree_skb(skb);
 925 err_skb:
 926         usb_free_urb(urb);
 927 err_urb:
 928         ath9k_hif_usb_dealloc_reg_in_urbs(hif_dev);
 929         return ret;
 930 }
 931
 932 static int ath9k_hif_usb_alloc_urbs(struct hif_device_usb *hif_dev)
 933 {
 934         /* Register Write */
 935         init_usb_anchor(&hif_dev->regout_submitted);
 936
 937         /* TX */
 938         if (ath9k_hif_usb_alloc_tx_urbs(hif_dev) < 0)
 939                 goto err;
 940
 941         /* RX */
 942         if (ath9k_hif_usb_alloc_rx_urbs(hif_dev) < 0)
 943                 goto err_rx;
 944
 945         /* Register Read */
 946         if (ath9k_hif_usb_alloc_reg_in_urbs(hif_dev) < 0)
 947                 goto err_reg;
 948
 949         return 0;
 950 err_reg:
 951         ath9k_hif_usb_dealloc_rx_urbs(hif_dev);
 952 err_rx:
 953         ath9k_hif_usb_dealloc_tx_urbs(hif_dev);
 954 err:
 955         return -ENOMEM;
 956 }
 957
 958 static void ath9k_hif_usb_dealloc_urbs(struct hif_device_usb *hif_dev)
 959 {
 960         usb_kill_anchored_urbs(&hif_dev->regout_submitted);
 961         ath9k_hif_usb_dealloc_reg_in_urbs(hif_dev);
 962         ath9k_hif_usb_dealloc_tx_urbs(hif_dev);
 963         ath9k_hif_usb_dealloc_rx_urbs(hif_dev);
 964 }
 965
 966 static int ath9k_hif_usb_download_fw(struct hif_device_usb *hif_dev,
 967                                      u32 drv_info)
 968 {
 969         int transfer, err;
 970         const void *data = hif_dev->firmware->data;
 971         size_t len = hif_dev->firmware->size;
 972         u32 addr = AR9271_FIRMWARE;
 973         u8 *buf = kzalloc(4096, GFP_KERNEL);
 974         u32 firm_offset;
 975
 976         if (!buf)
 977                 return -ENOMEM;
 978
 979         while (len) {
 980                 transfer = min_t(int, len, 4096);
 981                 memcpy(buf, data, transfer);
 982
 983                 err = usb_control_msg(hif_dev->udev,
 984                                       usb_sndctrlpipe(hif_dev->udev, 0),
 985                                       FIRMWARE_DOWNLOAD, 0x40 | USB_DIR_OUT,
 986                                       addr >> 8, 0, buf, transfer, HZ);
 987                 if (err < 0) {
 988                         kfree(buf);
 989                         return err;
 990                 }
 991
 992                 len -= transfer;
 993                 data += transfer;
 994                 addr += transfer;
 995         }
 996         kfree(buf);
 997
 998         if (IS_AR7010_DEVICE(drv_info))
 999                 firm_offset = AR7010_FIRMWARE_TEXT;
1000         else
1001                 firm_offset = AR9271_FIRMWARE_TEXT;
1002
1003         /*
1004          * Issue FW download complete command to firmware.
1005          */
1006         err = usb_control_msg(hif_dev->udev, usb_sndctrlpipe(hif_dev->udev, 0),
1007                               FIRMWARE_DOWNLOAD_COMP,
1008                               0x40 | USB_DIR_OUT,
1009                               firm_offset >> 8, 0, NULL, 0, HZ);
1010         if (err)
1011                 return -EIO;
1012
1013         dev_info(&hif_dev->udev->dev, "ath9k_htc: Transferred FW: %s, size: %ld\n",
1014                  hif_dev->fw_name, (unsigned long) hif_dev->firmware->size);
1015
1016         return 0;
1017 }
1018
1019 static int ath9k_hif_usb_dev_init(struct hif_device_usb *hif_dev, u32 drv_info)
1020 {
1021         int ret, idx;
1022         struct usb_host_interface *alt = &hif_dev->interface->altsetting[0];
1023         struct usb_endpoint_descriptor *endp;
1024
1025         /* Request firmware */
1026         ret = request_firmware(&hif_dev->firmware, hif_dev->fw_name,
1027                                &hif_dev->udev->dev);
1028         if (ret) {
1029                 dev_err(&hif_dev->udev->dev,
1030                         "ath9k_htc: Firmware - %s not found\n", hif_dev->fw_name);
1031                 goto err_fw_req;
1032         }
1033
1034         /* Download firmware */
1035         ret = ath9k_hif_usb_download_fw(hif_dev, drv_info);
1036         if (ret) {
1037                 dev_err(&hif_dev->udev->dev,
1038                         "ath9k_htc: Firmware - %s download failed\n",
1039                         hif_dev->fw_name);
1040                 goto err_fw_download;
1041         }
1042
1043         /* On downloading the firmware to the target, the USB descriptor of EP4
1044          * is 'patched' to change the type of the endpoint to Bulk. This will
1045          * bring down CPU usage during the scan period.
1046          */
1047         for (idx = 0; idx < alt->desc.bNumEndpoints; idx++) {
1048                 endp = &alt->endpoint[idx].desc;
1049                 if ((endp->bmAttributes & USB_ENDPOINT_XFERTYPE_MASK)
1050                                 == USB_ENDPOINT_XFER_INT) {
1051                         endp->bmAttributes &= ~USB_ENDPOINT_XFERTYPE_MASK;
1052                         endp->bmAttributes |= USB_ENDPOINT_XFER_BULK;
1053                         endp->bInterval = 0;
1054                 }
1055         }
1056
1057         /* Alloc URBs */
1058         ret = ath9k_hif_usb_alloc_urbs(hif_dev);
1059         if (ret) {
1060                 dev_err(&hif_dev->udev->dev,
1061                         "ath9k_htc: Unable to allocate URBs\n");
1062                 goto err_fw_download;
1063         }
1064
1065         return 0;
1066
1067 err_fw_download:
1068         release_firmware(hif_dev->firmware);
1069 err_fw_req:
1070         hif_dev->firmware = NULL;
1071         return ret;
1072 }
1073
1074 static void ath9k_hif_usb_dev_deinit(struct hif_device_usb *hif_dev)
1075 {
1076         ath9k_hif_usb_dealloc_urbs(hif_dev);
1077         if (hif_dev->firmware)
1078                 release_firmware(hif_dev->firmware);
1079 }
1080
1081 /*
1082  * An exact copy of the function from zd1211rw.
1083  */
1084 static int send_eject_command(struct usb_interface *interface)
1085 {
1086         struct usb_device *udev = interface_to_usbdev(interface);
1087         struct usb_host_interface *iface_desc = &interface->altsetting[0];
1088         struct usb_endpoint_descriptor *endpoint;
1089         unsigned char *cmd;
1090         u8 bulk_out_ep;
1091         int r;
1092
1093         /* Find bulk out endpoint */
1094         for (r = 1; r >= 0; r--) {
1095                 endpoint = &iface_desc->endpoint[r].desc;
1096                 if (usb_endpoint_dir_out(endpoint) &&
1097                     usb_endpoint_xfer_bulk(endpoint)) {
1098                         bulk_out_ep = endpoint->bEndpointAddress;
1099                         break;
1100                 }
1101         }
1102         if (r == -1) {
1103                 dev_err(&udev->dev,
1104                         "ath9k_htc: Could not find bulk out endpoint\n");
1105                 return -ENODEV;
1106         }
1107
1108         cmd = kzalloc(31, GFP_KERNEL);
1109         if (cmd == NULL)
1110                 return -ENODEV;
1111
1112         /* USB bulk command block */
1113         cmd[0] = 0x55;  /* bulk command signature */
1114         cmd[1] = 0x53;  /* bulk command signature */
1115         cmd[2] = 0x42;  /* bulk command signature */
1116         cmd[3] = 0x43;  /* bulk command signature */
1117         cmd[14] = 6;    /* command length */
1118
1119         cmd[15] = 0x1b; /* SCSI command: START STOP UNIT */
1120         cmd[19] = 0x2;  /* eject disc */
1121
1122         dev_info(&udev->dev, "Ejecting storage device...\n");
1123         r = usb_bulk_msg(udev, usb_sndbulkpipe(udev, bulk_out_ep),
1124                 cmd, 31, NULL, 2000);
1125         kfree(cmd);
1126         if (r)
1127                 return r;
1128
1129         /* At this point, the device disconnects and reconnects with the real
1130          * ID numbers. */
1131
1132         usb_set_intfdata(interface, NULL);
1133         return 0;
1134 }
1135
1136 static int ath9k_hif_usb_probe(struct usb_interface *interface,
1137                                const struct usb_device_id *id)
1138 {
1139         struct usb_device *udev = interface_to_usbdev(interface);
1140         struct hif_device_usb *hif_dev;
1141         int ret = 0;
1142
1143         if (id->driver_info == STORAGE_DEVICE)
1144                 return send_eject_command(interface);
1145
1146         hif_dev = kzalloc(sizeof(struct hif_device_usb), GFP_KERNEL);
1147         if (!hif_dev) {
1148                 ret = -ENOMEM;
1149                 goto err_alloc;
1150         }
1151
1152         usb_get_dev(udev);
1153         hif_dev->udev = udev;
1154         hif_dev->interface = interface;
1155         hif_dev->device_id = id->idProduct;
1156 #ifdef CONFIG_PM
1157         udev->reset_resume = 1;
1158 #endif
1159         usb_set_intfdata(interface, hif_dev);
1160
1161         hif_dev->htc_handle = ath9k_htc_hw_alloc(hif_dev, &hif_usb,
1162                                                  &hif_dev->udev->dev);
1163         if (hif_dev->htc_handle == NULL) {
1164                 ret = -ENOMEM;
1165                 goto err_htc_hw_alloc;
1166         }
1167
1168         /* Find out which firmware to load */
1169
1170         if (IS_AR7010_DEVICE(id->driver_info))
1171                 hif_dev->fw_name = FIRMWARE_AR7010_1_1;
1172         else
1173                 hif_dev->fw_name = FIRMWARE_AR9271;
1174
1175         ret = ath9k_hif_usb_dev_init(hif_dev, id->driver_info);
1176         if (ret) {
1177                 ret = -EINVAL;
1178                 goto err_hif_init_usb;
1179         }
1180
1181         ret = ath9k_htc_hw_init(hif_dev->htc_handle,
1182                                 &interface->dev, hif_dev->device_id,
1183                                 hif_dev->udev->product, id->driver_info);
1184         if (ret) {
1185                 ret = -EINVAL;
1186                 goto err_htc_hw_init;
1187         }
1188
1189         dev_info(&hif_dev->udev->dev, "ath9k_htc: USB layer initialized\n");
1190
1191         return 0;
1192
1193 err_htc_hw_init:
1194         ath9k_hif_usb_dev_deinit(hif_dev);
1195 err_hif_init_usb:
1196         ath9k_htc_hw_free(hif_dev->htc_handle);
1197 err_htc_hw_alloc:
1198         usb_set_intfdata(interface, NULL);
1199         kfree(hif_dev);
1200         usb_put_dev(udev);
1201 err_alloc:
1202         return ret;
1203 }
1204
1205 static void ath9k_hif_usb_reboot(struct usb_device *udev)
1206 {
1207         u32 reboot_cmd = 0xffffffff;
1208         void *buf;
1209         int ret;
1210
1211         buf = kmemdup(&reboot_cmd, 4, GFP_KERNEL);
1212         if (!buf)
1213                 return;
1214
1215         ret = usb_bulk_msg(udev, usb_sndbulkpipe(udev, USB_REG_OUT_PIPE),
1216                            buf, 4, NULL, HZ);
1217         if (ret)
1218                 dev_err(&udev->dev, "ath9k_htc: USB reboot failed\n");
1219
1220         kfree(buf);
1221 }
1222
1223 static void ath9k_hif_usb_disconnect(struct usb_interface *interface)
1224 {
1225         struct usb_device *udev = interface_to_usbdev(interface);
1226         struct hif_device_usb *hif_dev = usb_get_intfdata(interface);
1227         bool unplugged = (udev->state == USB_STATE_NOTATTACHED) ? true : false;
1228
1229         if (!hif_dev)
1230                 return;
1231
1232         ath9k_htc_hw_deinit(hif_dev->htc_handle, unplugged);
1233         ath9k_htc_hw_free(hif_dev->htc_handle);
1234         ath9k_hif_usb_dev_deinit(hif_dev);
1235         usb_set_intfdata(interface, NULL);
1236
1237         if (!unplugged && (hif_dev->flags & HIF_USB_START))
1238                 ath9k_hif_usb_reboot(udev);
1239
1240         kfree(hif_dev);
1241         dev_info(&udev->dev, "ath9k_htc: USB layer deinitialized\n");
1242         usb_put_dev(udev);
1243 }
1244
1245 #ifdef CONFIG_PM
1246 static int ath9k_hif_usb_suspend(struct usb_interface *interface,
1247                                  pm_message_t message)
1248 {
1249         struct hif_device_usb *hif_dev = usb_get_intfdata(interface);
1250
1251         /*
1252          * The device has to be set to FULLSLEEP mode in case no
1253          * interface is up.
1254          */
1255         if (!(hif_dev->flags & HIF_USB_START))
1256                 ath9k_htc_suspend(hif_dev->htc_handle);
1257
1258         ath9k_hif_usb_dealloc_urbs(hif_dev);
1259
1260         return 0;
1261 }
1262
1263 static int ath9k_hif_usb_resume(struct usb_interface *interface)
1264 {
1265         struct hif_device_usb *hif_dev = usb_get_intfdata(interface);
1266         struct htc_target *htc_handle = hif_dev->htc_handle;
1267         int ret;
1268
1269         ret = ath9k_hif_usb_alloc_urbs(hif_dev);
1270         if (ret)
1271                 return ret;
1272
1273         if (hif_dev->firmware) {
1274                 ret = ath9k_hif_usb_download_fw(hif_dev,
1275                                 htc_handle->drv_priv->ah->hw_version.usbdev);
1276                 if (ret)
1277                         goto fail_resume;
1278         } else {
1279                 ath9k_hif_usb_dealloc_urbs(hif_dev);
1280                 return -EIO;
1281         }
1282
1283         mdelay(100);
1284
1285         ret = ath9k_htc_resume(htc_handle);
1286
1287         if (ret)
1288                 goto fail_resume;
1289
1290         return 0;
1291
1292 fail_resume:
1293         ath9k_hif_usb_dealloc_urbs(hif_dev);
1294
1295         return ret;
1296 }
1297 #endif
1298
1299 static struct usb_driver ath9k_hif_usb_driver = {
1300         .name = KBUILD_MODNAME,
1301         .probe = ath9k_hif_usb_probe,
1302         .disconnect = ath9k_hif_usb_disconnect,
1303 #ifdef CONFIG_PM
1304         .suspend = ath9k_hif_usb_suspend,
1305         .resume = ath9k_hif_usb_resume,
1306         .reset_resume = ath9k_hif_usb_resume,
1307 #endif
1308         .id_table = ath9k_hif_usb_ids,
1309         .soft_unbind = 1,
1310 };
1311
1312 int ath9k_hif_usb_init(void)
1313 {
1314         return usb_register(&ath9k_hif_usb_driver);
1315 }
1316
1317 void ath9k_hif_usb_exit(void)
1318 {
1319         usb_deregister(&ath9k_hif_usb_driver);
1320 }