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

   1 /*
   2  * Copyright (c) 2010-2011 Atheros Communications Inc.
   3  *
   4  * Permission to use, copy, modify, and/or distribute this software for any
   5  * purpose with or without fee is hereby granted, provided that the above
   6  * copyright notice and this permission notice appear in all copies.
   7  *
   8  * THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL WARRANTIES
   9  * WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF
  10  * MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR
  11  * ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES
  12  * WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN
  13  * ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF
  14  * OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
  15  */
  16
  17 #include <asm/unaligned.h>
  18 #include "htc.h"
  19
  20 /* identify firmware images */
  21 #define FIRMWARE_AR7010_1_1     "htc_7010.fw"
  22 #define FIRMWARE_AR9271         "htc_9271.fw"
  23
  24 MODULE_FIRMWARE(FIRMWARE_AR7010_1_1);
  25 MODULE_FIRMWARE(FIRMWARE_AR9271);
  26
  27 static struct usb_device_id ath9k_hif_usb_ids[] = {
  28         { USB_DEVICE(0x0cf3, 0x9271) }, /* Atheros */
  29         { USB_DEVICE(0x0cf3, 0x1006) }, /* Atheros */
  30         { USB_DEVICE(0x0846, 0x9030) }, /* Netgear N150 */
  31         { USB_DEVICE(0x07D1, 0x3A10) }, /* Dlink Wireless 150 */
  32         { USB_DEVICE(0x13D3, 0x3327) }, /* Azurewave */
  33         { USB_DEVICE(0x13D3, 0x3328) }, /* Azurewave */
  34         { USB_DEVICE(0x13D3, 0x3346) }, /* IMC Networks */
  35         { USB_DEVICE(0x13D3, 0x3348) }, /* Azurewave */
  36         { USB_DEVICE(0x13D3, 0x3349) }, /* Azurewave */
  37         { USB_DEVICE(0x13D3, 0x3350) }, /* Azurewave */
  38         { USB_DEVICE(0x04CA, 0x4605) }, /* Liteon */
  39         { USB_DEVICE(0x040D, 0x3801) }, /* VIA */
  40         { USB_DEVICE(0x0cf3, 0xb003) }, /* Ubiquiti WifiStation Ext */
  41         { USB_DEVICE(0x057c, 0x8403) }, /* AVM FRITZ!WLAN 11N v2 USB */
  42
  43         { USB_DEVICE(0x0cf3, 0x7015),
  44           .driver_info = AR9287_USB },  /* Atheros */
  45         { USB_DEVICE(0x1668, 0x1200),
  46           .driver_info = AR9287_USB },  /* Verizon */
  47
  48         { USB_DEVICE(0x0cf3, 0x7010),
  49           .driver_info = AR9280_USB },  /* Atheros */
  50         { USB_DEVICE(0x0846, 0x9018),
  51           .driver_info = AR9280_USB },  /* Netgear WNDA3200 */
  52         { USB_DEVICE(0x083A, 0xA704),
  53           .driver_info = AR9280_USB },  /* SMC Networks */
  54         { USB_DEVICE(0x0411, 0x017f),
  55           .driver_info = AR9280_USB },  /* Sony UWA-BR100 */
  56         { USB_DEVICE(0x04da, 0x3904),
  57           .driver_info = AR9280_USB },
  58
  59         { USB_DEVICE(0x0cf3, 0x20ff),
  60           .driver_info = STORAGE_DEVICE },
  61
  62         { },
  63 };
  64
  65 MODULE_DEVICE_TABLE(usb, ath9k_hif_usb_ids);
  66
  67 static int __hif_usb_tx(struct hif_device_usb *hif_dev);
  68
  69 static void hif_usb_regout_cb(struct urb *urb)
  70 {
  71         struct cmd_buf *cmd = (struct cmd_buf *)urb->context;
  72
  73         switch (urb->status) {
  74         case 0:
  75                 break;
  76         case -ENOENT:
  77         case -ECONNRESET:
  78         case -ENODEV:
  79         case -ESHUTDOWN:
  80                 goto free;
  81         default:
  82                 break;
  83         }
  84
  85         if (cmd) {
  86                 ath9k_htc_txcompletion_cb(cmd->hif_dev->htc_handle,
  87                                           cmd->skb, true);
  88                 kfree(cmd);
  89         }
  90
  91         return;
  92 free:
  93         kfree_skb(cmd->skb);
  94         kfree(cmd);
  95 }
  96
  97 static int hif_usb_send_regout(struct hif_device_usb *hif_dev,
  98                                struct sk_buff *skb)
  99 {
 100         struct urb *urb;
 101         struct cmd_buf *cmd;
 102         int ret = 0;
 103
 104         urb = usb_alloc_urb(0, GFP_KERNEL);
 105         if (urb == NULL)
 106                 return -ENOMEM;
 107
 108         cmd = kzalloc(sizeof(*cmd), GFP_KERNEL);
 109         if (cmd == NULL) {
 110                 usb_free_urb(urb);
 111                 return -ENOMEM;
 112         }
 113
 114         cmd->skb = skb;
 115         cmd->hif_dev = hif_dev;
 116
 117         usb_fill_bulk_urb(urb, hif_dev->udev,
 118                          usb_sndbulkpipe(hif_dev->udev, USB_REG_OUT_PIPE),
 119                          skb->data, skb->len,
 120                          hif_usb_regout_cb, cmd);
 121
 122         usb_anchor_urb(urb, &hif_dev->regout_submitted);
 123         ret = usb_submit_urb(urb, GFP_KERNEL);
 124         if (ret) {
 125                 usb_unanchor_urb(urb);
 126                 kfree(cmd);
 127         }
 128         usb_free_urb(urb);
 129
 130         return ret;
 131 }
 132
 133 static void hif_usb_mgmt_cb(struct urb *urb)
 134 {
 135         struct cmd_buf *cmd = (struct cmd_buf *)urb->context;
 136         struct hif_device_usb *hif_dev;
 137         bool txok = true;
 138
 139         if (!cmd || !cmd->skb || !cmd->hif_dev)
 140                 return;
 141
 142         hif_dev = cmd->hif_dev;
 143
 144         switch (urb->status) {
 145         case 0:
 146                 break;
 147         case -ENOENT:
 148         case -ECONNRESET:
 149         case -ENODEV:
 150         case -ESHUTDOWN:
 151                 txok = false;
 152
 153                 /*
 154                  * If the URBs are being flushed, no need to complete
 155                  * this packet.
 156                  */
 157                 spin_lock(&hif_dev->tx.tx_lock);
 158                 if (hif_dev->tx.flags & HIF_USB_TX_FLUSH) {
 159                         spin_unlock(&hif_dev->tx.tx_lock);
 160                         dev_kfree_skb_any(cmd->skb);
 161                         kfree(cmd);
 162                         return;
 163                 }
 164                 spin_unlock(&hif_dev->tx.tx_lock);
 165
 166                 break;
 167         default:
 168                 txok = false;
 169                 break;
 170         }
 171
 172         skb_pull(cmd->skb, 4);
 173         ath9k_htc_txcompletion_cb(cmd->hif_dev->htc_handle,
 174                                   cmd->skb, txok);
 175         kfree(cmd);
 176 }
 177
 178 static int hif_usb_send_mgmt(struct hif_device_usb *hif_dev,
 179                              struct sk_buff *skb)
 180 {
 181         struct urb *urb;
 182         struct cmd_buf *cmd;
 183         int ret = 0;
 184         __le16 *hdr;
 185
 186         urb = usb_alloc_urb(0, GFP_ATOMIC);
 187         if (urb == NULL)
 188                 return -ENOMEM;
 189
 190         cmd = kzalloc(sizeof(*cmd), GFP_ATOMIC);
 191         if (cmd == NULL) {
 192                 usb_free_urb(urb);
 193                 return -ENOMEM;
 194         }
 195
 196         cmd->skb = skb;
 197         cmd->hif_dev = hif_dev;
 198
 199         hdr = (__le16 *) skb_push(skb, 4);
 200         *hdr++ = cpu_to_le16(skb->len - 4);
 201         *hdr++ = cpu_to_le16(ATH_USB_TX_STREAM_MODE_TAG);
 202
 203         usb_fill_bulk_urb(urb, hif_dev->udev,
 204                          usb_sndbulkpipe(hif_dev->udev, USB_WLAN_TX_PIPE),
 205                          skb->data, skb->len,
 206                          hif_usb_mgmt_cb, cmd);
 207
 208         usb_anchor_urb(urb, &hif_dev->mgmt_submitted);
 209         ret = usb_submit_urb(urb, GFP_ATOMIC);
 210         if (ret) {
 211                 usb_unanchor_urb(urb);
 212                 kfree(cmd);
 213         }
 214         usb_free_urb(urb);
 215
 216         return ret;
 217 }
 218
 219 static inline void ath9k_skb_queue_purge(struct hif_device_usb *hif_dev,
 220                                          struct sk_buff_head *list)
 221 {
 222         struct sk_buff *skb;
 223
 224         while ((skb = __skb_dequeue(list)) != NULL) {
 225                 dev_kfree_skb_any(skb);
 226         }
 227 }
 228
 229 static inline void ath9k_skb_queue_complete(struct hif_device_usb *hif_dev,
 230                                             struct sk_buff_head *queue,
 231                                             bool txok)
 232 {
 233         struct sk_buff *skb;
 234
 235         while ((skb = __skb_dequeue(queue)) != NULL) {
 236                 ath9k_htc_txcompletion_cb(hif_dev->htc_handle,
 237                                           skb, txok);
 238                 if (txok)
 239                         TX_STAT_INC(skb_success);
 240                 else
 241                         TX_STAT_INC(skb_failed);
 242         }
 243 }
 244
 245 static void hif_usb_tx_cb(struct urb *urb)
 246 {
 247         struct tx_buf *tx_buf = (struct tx_buf *) urb->context;
 248         struct hif_device_usb *hif_dev;
 249         bool txok = true;
 250
 251         if (!tx_buf || !tx_buf->hif_dev)
 252                 return;
 253
 254         hif_dev = tx_buf->hif_dev;
 255
 256         switch (urb->status) {
 257         case 0:
 258                 break;
 259         case -ENOENT:
 260         case -ECONNRESET:
 261         case -ENODEV:
 262         case -ESHUTDOWN:
 263                 txok = false;
 264
 265                 /*
 266                  * If the URBs are being flushed, no need to add this
 267                  * URB to the free list.
 268                  */
 269                 spin_lock(&hif_dev->tx.tx_lock);
 270                 if (hif_dev->tx.flags & HIF_USB_TX_FLUSH) {
 271                         spin_unlock(&hif_dev->tx.tx_lock);
 272                         ath9k_skb_queue_purge(hif_dev, &tx_buf->skb_queue);
 273                         return;
 274                 }
 275                 spin_unlock(&hif_dev->tx.tx_lock);
 276
 277                 break;
 278         default:
 279                 txok = false;
 280                 break;
 281         }
 282
 283         ath9k_skb_queue_complete(hif_dev, &tx_buf->skb_queue, txok);
 284
 285         /* Re-initialize the SKB queue */
 286         tx_buf->len = tx_buf->offset = 0;
 287         __skb_queue_head_init(&tx_buf->skb_queue);
 288
 289         /* Add this TX buffer to the free list */
 290         spin_lock(&hif_dev->tx.tx_lock);
 291         list_move_tail(&tx_buf->list, &hif_dev->tx.tx_buf);
 292         hif_dev->tx.tx_buf_cnt++;
 293         if (!(hif_dev->tx.flags & HIF_USB_TX_STOP))
 294                 __hif_usb_tx(hif_dev); /* Check for pending SKBs */
 295         TX_STAT_INC(buf_completed);
 296         spin_unlock(&hif_dev->tx.tx_lock);
 297 }
 298
 299 /* TX lock has to be taken */
 300 static int __hif_usb_tx(struct hif_device_usb *hif_dev)
 301 {
 302         struct tx_buf *tx_buf = NULL;
 303         struct sk_buff *nskb = NULL;
 304         int ret = 0, i;
 305         u16 tx_skb_cnt = 0;
 306         u8 *buf;
 307         __le16 *hdr;
 308
 309         if (hif_dev->tx.tx_skb_cnt == 0)
 310                 return 0;
 311
 312         /* Check if a free TX buffer is available */
 313         if (list_empty(&hif_dev->tx.tx_buf))
 314                 return 0;
 315
 316         tx_buf = list_first_entry(&hif_dev->tx.tx_buf, struct tx_buf, list);
 317         list_move_tail(&tx_buf->list, &hif_dev->tx.tx_pending);
 318         hif_dev->tx.tx_buf_cnt--;
 319
 320         tx_skb_cnt = min_t(u16, hif_dev->tx.tx_skb_cnt, MAX_TX_AGGR_NUM);
 321
 322         for (i = 0; i < tx_skb_cnt; i++) {
 323                 nskb = __skb_dequeue(&hif_dev->tx.tx_skb_queue);
 324
 325                 /* Should never be NULL */
 326                 BUG_ON(!nskb);
 327
 328                 hif_dev->tx.tx_skb_cnt--;
 329
 330                 buf = tx_buf->buf;
 331                 buf += tx_buf->offset;
 332                 hdr = (__le16 *)buf;
 333                 *hdr++ = cpu_to_le16(nskb->len);
 334                 *hdr++ = cpu_to_le16(ATH_USB_TX_STREAM_MODE_TAG);
 335                 buf += 4;
 336                 memcpy(buf, nskb->data, nskb->len);
 337                 tx_buf->len = nskb->len + 4;
 338
 339                 if (i < (tx_skb_cnt - 1))
 340                         tx_buf->offset += (((tx_buf->len - 1) / 4) + 1) * 4;
 341
 342                 if (i == (tx_skb_cnt - 1))
 343                         tx_buf->len += tx_buf->offset;
 344
 345                 __skb_queue_tail(&tx_buf->skb_queue, nskb);
 346                 TX_STAT_INC(skb_queued);
 347         }
 348
 349         usb_fill_bulk_urb(tx_buf->urb, hif_dev->udev,
 350                           usb_sndbulkpipe(hif_dev->udev, USB_WLAN_TX_PIPE),
 351                           tx_buf->buf, tx_buf->len,
 352                           hif_usb_tx_cb, tx_buf);
 353
 354         ret = usb_submit_urb(tx_buf->urb, GFP_ATOMIC);
 355         if (ret) {
 356                 tx_buf->len = tx_buf->offset = 0;
 357                 ath9k_skb_queue_complete(hif_dev, &tx_buf->skb_queue, false);
 358                 __skb_queue_head_init(&tx_buf->skb_queue);
 359                 list_move_tail(&tx_buf->list, &hif_dev->tx.tx_buf);
 360                 hif_dev->tx.tx_buf_cnt++;
 361         }
 362
 363         if (!ret)
 364                 TX_STAT_INC(buf_queued);
 365
 366         return ret;
 367 }
 368
 369 static int hif_usb_send_tx(struct hif_device_usb *hif_dev, struct sk_buff *skb)
 370 {
 371         struct ath9k_htc_tx_ctl *tx_ctl;
 372         unsigned long flags;
 373         int ret = 0;
 374
 375         spin_lock_irqsave(&hif_dev->tx.tx_lock, flags);
 376
 377         if (hif_dev->tx.flags & HIF_USB_TX_STOP) {
 378                 spin_unlock_irqrestore(&hif_dev->tx.tx_lock, flags);
 379                 return -ENODEV;
 380         }
 381
 382         /* Check if the max queue count has been reached */
 383         if (hif_dev->tx.tx_skb_cnt > MAX_TX_BUF_NUM) {
 384                 spin_unlock_irqrestore(&hif_dev->tx.tx_lock, flags);
 385                 return -ENOMEM;
 386         }
 387
 388         spin_unlock_irqrestore(&hif_dev->tx.tx_lock, flags);
 389
 390         tx_ctl = HTC_SKB_CB(skb);
 391
 392         /* Mgmt/Beacon frames don't use the TX buffer pool */
 393         if ((tx_ctl->type == ATH9K_HTC_MGMT) ||
 394             (tx_ctl->type == ATH9K_HTC_BEACON)) {
 395                 ret = hif_usb_send_mgmt(hif_dev, skb);
 396         }
 397
 398         spin_lock_irqsave(&hif_dev->tx.tx_lock, flags);
 399
 400         if ((tx_ctl->type == ATH9K_HTC_NORMAL) ||
 401             (tx_ctl->type == ATH9K_HTC_AMPDU)) {
 402                 __skb_queue_tail(&hif_dev->tx.tx_skb_queue, skb);
 403                 hif_dev->tx.tx_skb_cnt++;
 404         }
 405
 406         /* Check if AMPDUs have to be sent immediately */
 407         if ((hif_dev->tx.tx_buf_cnt == MAX_TX_URB_NUM) &&
 408             (hif_dev->tx.tx_skb_cnt < 2)) {
 409                 __hif_usb_tx(hif_dev);
 410         }
 411
 412         spin_unlock_irqrestore(&hif_dev->tx.tx_lock, flags);
 413
 414         return ret;
 415 }
 416
 417 static void hif_usb_start(void *hif_handle)
 418 {
 419         struct hif_device_usb *hif_dev = (struct hif_device_usb *)hif_handle;
 420         unsigned long flags;
 421
 422         hif_dev->flags |= HIF_USB_START;
 423
 424         spin_lock_irqsave(&hif_dev->tx.tx_lock, flags);
 425         hif_dev->tx.flags &= ~HIF_USB_TX_STOP;
 426         spin_unlock_irqrestore(&hif_dev->tx.tx_lock, flags);
 427 }
 428
 429 static void hif_usb_stop(void *hif_handle)
 430 {
 431         struct hif_device_usb *hif_dev = (struct hif_device_usb *)hif_handle;
 432         struct tx_buf *tx_buf = NULL, *tx_buf_tmp = NULL;
 433         unsigned long flags;
 434
 435         spin_lock_irqsave(&hif_dev->tx.tx_lock, flags);
 436         ath9k_skb_queue_complete(hif_dev, &hif_dev->tx.tx_skb_queue, false);
 437         hif_dev->tx.tx_skb_cnt = 0;
 438         hif_dev->tx.flags |= HIF_USB_TX_STOP;
 439         spin_unlock_irqrestore(&hif_dev->tx.tx_lock, flags);
 440
 441         /* The pending URBs have to be canceled. */
 442         list_for_each_entry_safe(tx_buf, tx_buf_tmp,
 443                                  &hif_dev->tx.tx_pending, list) {
 444                 usb_kill_urb(tx_buf->urb);
 445         }
 446
 447         usb_kill_anchored_urbs(&hif_dev->mgmt_submitted);
 448 }
 449
 450 static int hif_usb_send(void *hif_handle, u8 pipe_id, struct sk_buff *skb)
 451 {
 452         struct hif_device_usb *hif_dev = (struct hif_device_usb *)hif_handle;
 453         int ret = 0;
 454
 455         switch (pipe_id) {
 456         case USB_WLAN_TX_PIPE:
 457                 ret = hif_usb_send_tx(hif_dev, skb);
 458                 break;
 459         case USB_REG_OUT_PIPE:
 460                 ret = hif_usb_send_regout(hif_dev, skb);
 461                 break;
 462         default:
 463                 dev_err(&hif_dev->udev->dev,
 464                         "ath9k_htc: Invalid TX pipe: %d\n", pipe_id);
 465                 ret = -EINVAL;
 466                 break;
 467         }
 468
 469         return ret;
 470 }
 471
 472 static inline bool check_index(struct sk_buff *skb, u8 idx)
 473 {
 474         struct ath9k_htc_tx_ctl *tx_ctl;
 475
 476         tx_ctl = HTC_SKB_CB(skb);
 477
 478         if ((tx_ctl->type == ATH9K_HTC_AMPDU) &&
 479             (tx_ctl->sta_idx == idx))
 480                 return true;
 481
 482         return false;
 483 }
 484
 485 static void hif_usb_sta_drain(void *hif_handle, u8 idx)
 486 {
 487         struct hif_device_usb *hif_dev = (struct hif_device_usb *)hif_handle;
 488         struct sk_buff *skb, *tmp;
 489         unsigned long flags;
 490
 491         spin_lock_irqsave(&hif_dev->tx.tx_lock, flags);
 492
 493         skb_queue_walk_safe(&hif_dev->tx.tx_skb_queue, skb, tmp) {
 494                 if (check_index(skb, idx)) {
 495                         __skb_unlink(skb, &hif_dev->tx.tx_skb_queue);
 496                         ath9k_htc_txcompletion_cb(hif_dev->htc_handle,
 497                                                   skb, false);
 498                         hif_dev->tx.tx_skb_cnt--;
 499                         TX_STAT_INC(skb_failed);
 500                 }
 501         }
 502
 503         spin_unlock_irqrestore(&hif_dev->tx.tx_lock, flags);
 504 }
 505
 506 static struct ath9k_htc_hif hif_usb = {
 507         .transport = ATH9K_HIF_USB,
 508         .name = "ath9k_hif_usb",
 509
 510         .control_ul_pipe = USB_REG_OUT_PIPE,
 511         .control_dl_pipe = USB_REG_IN_PIPE,
 512
 513         .start = hif_usb_start,
 514         .stop = hif_usb_stop,
 515         .sta_drain = hif_usb_sta_drain,
 516         .send = hif_usb_send,
 517 };
 518
 519 static void ath9k_hif_usb_rx_stream(struct hif_device_usb *hif_dev,
 520                                     struct sk_buff *skb)
 521 {
 522         struct sk_buff *nskb, *skb_pool[MAX_PKT_NUM_IN_TRANSFER];
 523         int index = 0, i = 0, len = skb->len;
 524         int rx_remain_len, rx_pkt_len;
 525         u16 pool_index = 0;
 526         u8 *ptr;
 527
 528         spin_lock(&hif_dev->rx_lock);
 529
 530         rx_remain_len = hif_dev->rx_remain_len;
 531         rx_pkt_len = hif_dev->rx_transfer_len;
 532
 533         if (rx_remain_len != 0) {
 534                 struct sk_buff *remain_skb = hif_dev->remain_skb;
 535
 536                 if (remain_skb) {
 537                         ptr = (u8 *) remain_skb->data;
 538
 539                         index = rx_remain_len;
 540                         rx_remain_len -= hif_dev->rx_pad_len;
 541                         ptr += rx_pkt_len;
 542
 543                         memcpy(ptr, skb->data, rx_remain_len);
 544
 545                         rx_pkt_len += rx_remain_len;
 546                         hif_dev->rx_remain_len = 0;
 547                         skb_put(remain_skb, rx_pkt_len);
 548
 549                         skb_pool[pool_index++] = remain_skb;
 550
 551                 } else {
 552                         index = rx_remain_len;
 553                 }
 554         }
 555
 556         spin_unlock(&hif_dev->rx_lock);
 557
 558         while (index < len) {
 559                 u16 pkt_len;
 560                 u16 pkt_tag;
 561                 u16 pad_len;
 562                 int chk_idx;
 563
 564                 ptr = (u8 *) skb->data;
 565
 566                 pkt_len = get_unaligned_le16(ptr + index);
 567                 pkt_tag = get_unaligned_le16(ptr + index + 2);
 568
 569                 if (pkt_tag != ATH_USB_RX_STREAM_MODE_TAG) {
 570                         RX_STAT_INC(skb_dropped);
 571                         return;
 572                 }
 573
 574                 pad_len = 4 - (pkt_len & 0x3);
 575                 if (pad_len == 4)
 576                         pad_len = 0;
 577
 578                 chk_idx = index;
 579                 index = index + 4 + pkt_len + pad_len;
 580
 581                 if (index > MAX_RX_BUF_SIZE) {
 582                         spin_lock(&hif_dev->rx_lock);
 583                         hif_dev->rx_remain_len = index - MAX_RX_BUF_SIZE;
 584                         hif_dev->rx_transfer_len =
 585                                 MAX_RX_BUF_SIZE - chk_idx - 4;
 586                         hif_dev->rx_pad_len = pad_len;
 587
 588                         nskb = __dev_alloc_skb(pkt_len + 32, GFP_ATOMIC);
 589                         if (!nskb) {
 590                                 dev_err(&hif_dev->udev->dev,
 591                                         "ath9k_htc: RX memory allocation error\n");
 592                                 spin_unlock(&hif_dev->rx_lock);
 593                                 goto err;
 594                         }
 595                         skb_reserve(nskb, 32);
 596                         RX_STAT_INC(skb_allocated);
 597
 598                         memcpy(nskb->data, &(skb->data[chk_idx+4]),
 599                                hif_dev->rx_transfer_len);
 600
 601                         /* Record the buffer pointer */
 602                         hif_dev->remain_skb = nskb;
 603                         spin_unlock(&hif_dev->rx_lock);
 604                 } else {
 605                         nskb = __dev_alloc_skb(pkt_len + 32, GFP_ATOMIC);
 606                         if (!nskb) {
 607                                 dev_err(&hif_dev->udev->dev,
 608                                         "ath9k_htc: RX memory allocation error\n");
 609                                 goto err;
 610                         }
 611                         skb_reserve(nskb, 32);
 612                         RX_STAT_INC(skb_allocated);
 613
 614                         memcpy(nskb->data, &(skb->data[chk_idx+4]), pkt_len);
 615                         skb_put(nskb, pkt_len);
 616                         skb_pool[pool_index++] = nskb;
 617                 }
 618         }
 619
 620 err:
 621         for (i = 0; i < pool_index; i++) {
 622                 ath9k_htc_rx_msg(hif_dev->htc_handle, skb_pool[i],
 623                                  skb_pool[i]->len, USB_WLAN_RX_PIPE);
 624                 RX_STAT_INC(skb_completed);
 625         }
 626 }
 627
 628 static void ath9k_hif_usb_rx_cb(struct urb *urb)
 629 {
 630         struct sk_buff *skb = (struct sk_buff *) urb->context;
 631         struct hif_device_usb *hif_dev =
 632                 usb_get_intfdata(usb_ifnum_to_if(urb->dev, 0));
 633         int ret;
 634
 635         if (!skb)
 636                 return;
 637
 638         if (!hif_dev)
 639                 goto free;
 640
 641         switch (urb->status) {
 642         case 0:
 643                 break;
 644         case -ENOENT:
 645         case -ECONNRESET:
 646         case -ENODEV:
 647         case -ESHUTDOWN:
 648                 goto free;
 649         default:
 650                 goto resubmit;
 651         }
 652
 653         if (likely(urb->actual_length != 0)) {
 654                 skb_put(skb, urb->actual_length);
 655                 ath9k_hif_usb_rx_stream(hif_dev, skb);
 656         }
 657
 658 resubmit:
 659         skb_reset_tail_pointer(skb);
 660         skb_trim(skb, 0);
 661
 662         usb_anchor_urb(urb, &hif_dev->rx_submitted);
 663         ret = usb_submit_urb(urb, GFP_ATOMIC);
 664         if (ret) {
 665                 usb_unanchor_urb(urb);
 666                 goto free;
 667         }
 668
 669         return;
 670 free:
 671         kfree_skb(skb);
 672 }
 673
 674 static void ath9k_hif_usb_reg_in_cb(struct urb *urb)
 675 {
 676         struct sk_buff *skb = (struct sk_buff *) urb->context;
 677         struct sk_buff *nskb;
 678         struct hif_device_usb *hif_dev =
 679                 usb_get_intfdata(usb_ifnum_to_if(urb->dev, 0));
 680         int ret;
 681
 682         if (!skb)
 683                 return;
 684
 685         if (!hif_dev)
 686                 goto free;
 687
 688         switch (urb->status) {
 689         case 0:
 690                 break;
 691         case -ENOENT:
 692         case -ECONNRESET:
 693         case -ENODEV:
 694         case -ESHUTDOWN:
 695                 goto free;
 696         default:
 697                 skb_reset_tail_pointer(skb);
 698                 skb_trim(skb, 0);
 699
 700                 goto resubmit;
 701         }
 702
 703         if (likely(urb->actual_length != 0)) {
 704                 skb_put(skb, urb->actual_length);
 705
 706                 /* Process the command first */
 707                 ath9k_htc_rx_msg(hif_dev->htc_handle, skb,
 708                                  skb->len, USB_REG_IN_PIPE);
 709
 710
 711                 nskb = alloc_skb(MAX_REG_IN_BUF_SIZE, GFP_ATOMIC);
 712                 if (!nskb) {
 713                         dev_err(&hif_dev->udev->dev,
 714                                 "ath9k_htc: REG_IN memory allocation failure\n");
 715                         urb->context = NULL;
 716                         return;
 717                 }
 718
 719                 usb_fill_bulk_urb(urb, hif_dev->udev,
 720                                  usb_rcvbulkpipe(hif_dev->udev,
 721                                                  USB_REG_IN_PIPE),
 722                                  nskb->data, MAX_REG_IN_BUF_SIZE,
 723                                  ath9k_hif_usb_reg_in_cb, nskb);
 724         }
 725
 726 resubmit:
 727         usb_anchor_urb(urb, &hif_dev->reg_in_submitted);
 728         ret = usb_submit_urb(urb, GFP_ATOMIC);
 729         if (ret) {
 730                 usb_unanchor_urb(urb);
 731                 goto free;
 732         }
 733
 734         return;
 735 free:
 736         kfree_skb(skb);
 737         urb->context = NULL;
 738 }
 739
 740 static void ath9k_hif_usb_dealloc_tx_urbs(struct hif_device_usb *hif_dev)
 741 {
 742         struct tx_buf *tx_buf = NULL, *tx_buf_tmp = NULL;
 743         unsigned long flags;
 744
 745         list_for_each_entry_safe(tx_buf, tx_buf_tmp,
 746                                  &hif_dev->tx.tx_buf, list) {
 747                 usb_kill_urb(tx_buf->urb);
 748                 list_del(&tx_buf->list);
 749                 usb_free_urb(tx_buf->urb);
 750                 kfree(tx_buf->buf);
 751                 kfree(tx_buf);
 752         }
 753
 754         spin_lock_irqsave(&hif_dev->tx.tx_lock, flags);
 755         hif_dev->tx.flags |= HIF_USB_TX_FLUSH;
 756         spin_unlock_irqrestore(&hif_dev->tx.tx_lock, flags);
 757
 758         list_for_each_entry_safe(tx_buf, tx_buf_tmp,
 759                                  &hif_dev->tx.tx_pending, list) {
 760                 usb_kill_urb(tx_buf->urb);
 761                 list_del(&tx_buf->list);
 762                 usb_free_urb(tx_buf->urb);
 763                 kfree(tx_buf->buf);
 764                 kfree(tx_buf);
 765         }
 766
 767         usb_kill_anchored_urbs(&hif_dev->mgmt_submitted);
 768 }
 769
 770 static int ath9k_hif_usb_alloc_tx_urbs(struct hif_device_usb *hif_dev)
 771 {
 772         struct tx_buf *tx_buf;
 773         int i;
 774
 775         INIT_LIST_HEAD(&hif_dev->tx.tx_buf);
 776         INIT_LIST_HEAD(&hif_dev->tx.tx_pending);
 777         spin_lock_init(&hif_dev->tx.tx_lock);
 778         __skb_queue_head_init(&hif_dev->tx.tx_skb_queue);
 779         init_usb_anchor(&hif_dev->mgmt_submitted);
 780
 781         for (i = 0; i < MAX_TX_URB_NUM; i++) {
 782                 tx_buf = kzalloc(sizeof(struct tx_buf), GFP_KERNEL);
 783                 if (!tx_buf)
 784                         goto err;
 785
 786                 tx_buf->buf = kzalloc(MAX_TX_BUF_SIZE, GFP_KERNEL);
 787                 if (!tx_buf->buf)
 788                         goto err;
 789
 790                 tx_buf->urb = usb_alloc_urb(0, GFP_KERNEL);
 791                 if (!tx_buf->urb)
 792                         goto err;
 793
 794                 tx_buf->hif_dev = hif_dev;
 795                 __skb_queue_head_init(&tx_buf->skb_queue);
 796
 797                 list_add_tail(&tx_buf->list, &hif_dev->tx.tx_buf);
 798         }
 799
 800         hif_dev->tx.tx_buf_cnt = MAX_TX_URB_NUM;
 801
 802         return 0;
 803 err:
 804         if (tx_buf) {
 805                 kfree(tx_buf->buf);
 806                 kfree(tx_buf);
 807         }
 808         ath9k_hif_usb_dealloc_tx_urbs(hif_dev);
 809         return -ENOMEM;
 810 }
 811
 812 static void ath9k_hif_usb_dealloc_rx_urbs(struct hif_device_usb *hif_dev)
 813 {
 814         usb_kill_anchored_urbs(&hif_dev->rx_submitted);
 815 }
 816
 817 static int ath9k_hif_usb_alloc_rx_urbs(struct hif_device_usb *hif_dev)
 818 {
 819         struct urb *urb = NULL;
 820         struct sk_buff *skb = NULL;
 821         int i, ret;
 822
 823         init_usb_anchor(&hif_dev->rx_submitted);
 824         spin_lock_init(&hif_dev->rx_lock);
 825
 826         for (i = 0; i < MAX_RX_URB_NUM; i++) {
 827
 828                 /* Allocate URB */
 829                 urb = usb_alloc_urb(0, GFP_KERNEL);
 830                 if (urb == NULL) {
 831                         ret = -ENOMEM;
 832                         goto err_urb;
 833                 }
 834
 835                 /* Allocate buffer */
 836                 skb = alloc_skb(MAX_RX_BUF_SIZE, GFP_KERNEL);
 837                 if (!skb) {
 838                         ret = -ENOMEM;
 839                         goto err_skb;
 840                 }
 841
 842                 usb_fill_bulk_urb(urb, hif_dev->udev,
 843                                   usb_rcvbulkpipe(hif_dev->udev,
 844                                                   USB_WLAN_RX_PIPE),
 845                                   skb->data, MAX_RX_BUF_SIZE,
 846                                   ath9k_hif_usb_rx_cb, skb);
 847
 848                 /* Anchor URB */
 849                 usb_anchor_urb(urb, &hif_dev->rx_submitted);
 850
 851                 /* Submit URB */
 852                 ret = usb_submit_urb(urb, GFP_KERNEL);
 853                 if (ret) {
 854                         usb_unanchor_urb(urb);
 855                         goto err_submit;
 856                 }
 857
 858                 /*
 859                  * Drop reference count.
 860                  * This ensures that the URB is freed when killing them.
 861                  */
 862                 usb_free_urb(urb);
 863         }
 864
 865         return 0;
 866
 867 err_submit:
 868         kfree_skb(skb);
 869 err_skb:
 870         usb_free_urb(urb);
 871 err_urb:
 872         ath9k_hif_usb_dealloc_rx_urbs(hif_dev);
 873         return ret;
 874 }
 875
 876 static void ath9k_hif_usb_dealloc_reg_in_urbs(struct hif_device_usb *hif_dev)
 877 {
 878         usb_kill_anchored_urbs(&hif_dev->reg_in_submitted);
 879 }
 880
 881 static int ath9k_hif_usb_alloc_reg_in_urbs(struct hif_device_usb *hif_dev)
 882 {
 883         struct urb *urb = NULL;
 884         struct sk_buff *skb = NULL;
 885         int i, ret;
 886
 887         init_usb_anchor(&hif_dev->reg_in_submitted);
 888
 889         for (i = 0; i < MAX_REG_IN_URB_NUM; i++) {
 890
 891                 /* Allocate URB */
 892                 urb = usb_alloc_urb(0, GFP_KERNEL);
 893                 if (urb == NULL) {
 894                         ret = -ENOMEM;
 895                         goto err_urb;
 896                 }
 897
 898                 /* Allocate buffer */
 899                 skb = alloc_skb(MAX_REG_IN_BUF_SIZE, GFP_KERNEL);
 900                 if (!skb) {
 901                         ret = -ENOMEM;
 902                         goto err_skb;
 903                 }
 904
 905                 usb_fill_bulk_urb(urb, hif_dev->udev,
 906                                   usb_rcvbulkpipe(hif_dev->udev,
 907                                                   USB_REG_IN_PIPE),
 908                                   skb->data, MAX_REG_IN_BUF_SIZE,
 909                                   ath9k_hif_usb_reg_in_cb, skb);
 910
 911                 /* Anchor URB */
 912                 usb_anchor_urb(urb, &hif_dev->reg_in_submitted);
 913
 914                 /* Submit URB */
 915                 ret = usb_submit_urb(urb, GFP_KERNEL);
 916                 if (ret) {
 917                         usb_unanchor_urb(urb);
 918                         goto err_submit;
 919                 }
 920
 921                 /*
 922                  * Drop reference count.
 923                  * This ensures that the URB is freed when killing them.
 924                  */
 925                 usb_free_urb(urb);
 926         }
 927
 928         return 0;
 929
 930 err_submit:
 931         kfree_skb(skb);
 932 err_skb:
 933         usb_free_urb(urb);
 934 err_urb:
 935         ath9k_hif_usb_dealloc_reg_in_urbs(hif_dev);
 936         return ret;
 937 }
 938
 939 static int ath9k_hif_usb_alloc_urbs(struct hif_device_usb *hif_dev)
 940 {
 941         /* Register Write */
 942         init_usb_anchor(&hif_dev->regout_submitted);
 943
 944         /* TX */
 945         if (ath9k_hif_usb_alloc_tx_urbs(hif_dev) < 0)
 946                 goto err;
 947
 948         /* RX */
 949         if (ath9k_hif_usb_alloc_rx_urbs(hif_dev) < 0)
 950                 goto err_rx;
 951
 952         /* Register Read */
 953         if (ath9k_hif_usb_alloc_reg_in_urbs(hif_dev) < 0)
 954                 goto err_reg;
 955
 956         return 0;
 957 err_reg:
 958         ath9k_hif_usb_dealloc_rx_urbs(hif_dev);
 959 err_rx:
 960         ath9k_hif_usb_dealloc_tx_urbs(hif_dev);
 961 err:
 962         return -ENOMEM;
 963 }
 964
 965 static void ath9k_hif_usb_dealloc_urbs(struct hif_device_usb *hif_dev)
 966 {
 967         usb_kill_anchored_urbs(&hif_dev->regout_submitted);
 968         ath9k_hif_usb_dealloc_reg_in_urbs(hif_dev);
 969         ath9k_hif_usb_dealloc_tx_urbs(hif_dev);
 970         ath9k_hif_usb_dealloc_rx_urbs(hif_dev);
 971 }
 972
 973 static int ath9k_hif_usb_download_fw(struct hif_device_usb *hif_dev)
 974 {
 975         int transfer, err;
 976         const void *data = hif_dev->fw_data;
 977         size_t len = hif_dev->fw_size;
 978         u32 addr = AR9271_FIRMWARE;
 979         u8 *buf = kzalloc(4096, GFP_KERNEL);
 980         u32 firm_offset;
 981
 982         if (!buf)
 983                 return -ENOMEM;
 984
 985         while (len) {
 986                 transfer = min_t(size_t, len, 4096);
 987                 memcpy(buf, data, transfer);
 988
 989                 err = usb_control_msg(hif_dev->udev,
 990                                       usb_sndctrlpipe(hif_dev->udev, 0),
 991                                       FIRMWARE_DOWNLOAD, 0x40 | USB_DIR_OUT,
 992                                       addr >> 8, 0, buf, transfer, HZ);
 993                 if (err < 0) {
 994                         kfree(buf);
 995                         return err;
 996                 }
 997
 998                 len -= transfer;
 999                 data += transfer;
1000                 addr += transfer;
1001         }
1002         kfree(buf);
1003
1004         if (IS_AR7010_DEVICE(hif_dev->usb_device_id->driver_info))
1005                 firm_offset = AR7010_FIRMWARE_TEXT;
1006         else
1007                 firm_offset = AR9271_FIRMWARE_TEXT;
1008
1009         /*
1010          * Issue FW download complete command to firmware.
1011          */
1012         err = usb_control_msg(hif_dev->udev, usb_sndctrlpipe(hif_dev->udev, 0),
1013                               FIRMWARE_DOWNLOAD_COMP,
1014                               0x40 | USB_DIR_OUT,
1015                               firm_offset >> 8, 0, NULL, 0, HZ);
1016         if (err)
1017                 return -EIO;
1018
1019         dev_info(&hif_dev->udev->dev, "ath9k_htc: Transferred FW: %s, size: %ld\n",
1020                  hif_dev->fw_name, (unsigned long) hif_dev->fw_size);
1021
1022         return 0;
1023 }
1024
1025 static int ath9k_hif_usb_dev_init(struct hif_device_usb *hif_dev)
1026 {
1027         struct usb_host_interface *alt = &hif_dev->interface->altsetting[0];
1028         struct usb_endpoint_descriptor *endp;
1029         int ret, idx;
1030
1031         ret = ath9k_hif_usb_download_fw(hif_dev);
1032         if (ret) {
1033                 dev_err(&hif_dev->udev->dev,
1034                         "ath9k_htc: Firmware - %s download failed\n",
1035                         hif_dev->fw_name);
1036                 return ret;
1037         }
1038
1039         /* On downloading the firmware to the target, the USB descriptor of EP4
1040          * is 'patched' to change the type of the endpoint to Bulk. This will
1041          * bring down CPU usage during the scan period.
1042          */
1043         for (idx = 0; idx < alt->desc.bNumEndpoints; idx++) {
1044                 endp = &alt->endpoint[idx].desc;
1045                 if ((endp->bmAttributes & USB_ENDPOINT_XFERTYPE_MASK)
1046                                 == USB_ENDPOINT_XFER_INT) {
1047                         endp->bmAttributes &= ~USB_ENDPOINT_XFERTYPE_MASK;
1048                         endp->bmAttributes |= USB_ENDPOINT_XFER_BULK;
1049                         endp->bInterval = 0;
1050                 }
1051         }
1052
1053         /* Alloc URBs */
1054         ret = ath9k_hif_usb_alloc_urbs(hif_dev);
1055         if (ret) {
1056                 dev_err(&hif_dev->udev->dev,
1057                         "ath9k_htc: Unable to allocate URBs\n");
1058                 return ret;
1059         }
1060
1061         return 0;
1062 }
1063
1064 static void ath9k_hif_usb_dev_deinit(struct hif_device_usb *hif_dev)
1065 {
1066         ath9k_hif_usb_dealloc_urbs(hif_dev);
1067 }
1068
1069 /*
1070  * If initialization fails or the FW cannot be retrieved,
1071  * detach the device.
1072  */
1073 static void ath9k_hif_usb_firmware_fail(struct hif_device_usb *hif_dev)
1074 {
1075         struct device *dev = &hif_dev->udev->dev;
1076         struct device *parent = dev->parent;
1077
1078         complete(&hif_dev->fw_done);
1079
1080         if (parent)
1081                 device_lock(parent);
1082
1083         device_release_driver(dev);
1084
1085         if (parent)
1086                 device_unlock(parent);
1087 }
1088
1089 static void ath9k_hif_usb_firmware_cb(const struct firmware *fw, void *context)
1090 {
1091         struct hif_device_usb *hif_dev = context;
1092         int ret;
1093
1094         if (!fw) {
1095                 dev_err(&hif_dev->udev->dev,
1096                         "ath9k_htc: Failed to get firmware %s\n",
1097                         hif_dev->fw_name);
1098                 goto err_fw;
1099         }
1100
1101         hif_dev->htc_handle = ath9k_htc_hw_alloc(hif_dev, &hif_usb,
1102                                                  &hif_dev->udev->dev);
1103         if (hif_dev->htc_handle == NULL)
1104                 goto err_dev_alloc;
1105
1106         hif_dev->fw_data = fw->data;
1107         hif_dev->fw_size = fw->size;
1108
1109         /* Proceed with initialization */
1110
1111         ret = ath9k_hif_usb_dev_init(hif_dev);
1112         if (ret)
1113                 goto err_dev_init;
1114
1115         ret = ath9k_htc_hw_init(hif_dev->htc_handle,
1116                                 &hif_dev->interface->dev,
1117                                 hif_dev->usb_device_id->idProduct,
1118                                 hif_dev->udev->product,
1119                                 hif_dev->usb_device_id->driver_info);
1120         if (ret) {
1121                 ret = -EINVAL;
1122                 goto err_htc_hw_init;
1123         }
1124
1125         release_firmware(fw);
1126         hif_dev->flags |= HIF_USB_READY;
1127         complete(&hif_dev->fw_done);
1128
1129         return;
1130
1131 err_htc_hw_init:
1132         ath9k_hif_usb_dev_deinit(hif_dev);
1133 err_dev_init:
1134         ath9k_htc_hw_free(hif_dev->htc_handle);
1135 err_dev_alloc:
1136         release_firmware(fw);
1137 err_fw:
1138         ath9k_hif_usb_firmware_fail(hif_dev);
1139 }
1140
1141 /*
1142  * An exact copy of the function from zd1211rw.
1143  */
1144 static int send_eject_command(struct usb_interface *interface)
1145 {
1146         struct usb_device *udev = interface_to_usbdev(interface);
1147         struct usb_host_interface *iface_desc = &interface->altsetting[0];
1148         struct usb_endpoint_descriptor *endpoint;
1149         unsigned char *cmd;
1150         u8 bulk_out_ep;
1151         int r;
1152
1153         /* Find bulk out endpoint */
1154         for (r = 1; r >= 0; r--) {
1155                 endpoint = &iface_desc->endpoint[r].desc;
1156                 if (usb_endpoint_dir_out(endpoint) &&
1157                     usb_endpoint_xfer_bulk(endpoint)) {
1158                         bulk_out_ep = endpoint->bEndpointAddress;
1159                         break;
1160                 }
1161         }
1162         if (r == -1) {
1163                 dev_err(&udev->dev,
1164                         "ath9k_htc: Could not find bulk out endpoint\n");
1165                 return -ENODEV;
1166         }
1167
1168         cmd = kzalloc(31, GFP_KERNEL);
1169         if (cmd == NULL)
1170                 return -ENODEV;
1171
1172         /* USB bulk command block */
1173         cmd[0] = 0x55;  /* bulk command signature */
1174         cmd[1] = 0x53;  /* bulk command signature */
1175         cmd[2] = 0x42;  /* bulk command signature */
1176         cmd[3] = 0x43;  /* bulk command signature */
1177         cmd[14] = 6;    /* command length */
1178
1179         cmd[15] = 0x1b; /* SCSI command: START STOP UNIT */
1180         cmd[19] = 0x2;  /* eject disc */
1181
1182         dev_info(&udev->dev, "Ejecting storage device...\n");
1183         r = usb_bulk_msg(udev, usb_sndbulkpipe(udev, bulk_out_ep),
1184                 cmd, 31, NULL, 2000);
1185         kfree(cmd);
1186         if (r)
1187                 return r;
1188
1189         /* At this point, the device disconnects and reconnects with the real
1190          * ID numbers. */
1191
1192         usb_set_intfdata(interface, NULL);
1193         return 0;
1194 }
1195
1196 static int ath9k_hif_usb_probe(struct usb_interface *interface,
1197                                const struct usb_device_id *id)
1198 {
1199         struct usb_device *udev = interface_to_usbdev(interface);
1200         struct hif_device_usb *hif_dev;
1201         int ret = 0;
1202
1203         if (id->driver_info == STORAGE_DEVICE)
1204                 return send_eject_command(interface);
1205
1206         hif_dev = kzalloc(sizeof(struct hif_device_usb), GFP_KERNEL);
1207         if (!hif_dev) {
1208                 ret = -ENOMEM;
1209                 goto err_alloc;
1210         }
1211
1212         usb_get_dev(udev);
1213
1214         hif_dev->udev = udev;
1215         hif_dev->interface = interface;
1216         hif_dev->usb_device_id = id;
1217 #ifdef CONFIG_PM
1218         udev->reset_resume = 1;
1219 #endif
1220         usb_set_intfdata(interface, hif_dev);
1221
1222         init_completion(&hif_dev->fw_done);
1223
1224         /* Find out which firmware to load */
1225
1226         if (IS_AR7010_DEVICE(id->driver_info))
1227                 hif_dev->fw_name = FIRMWARE_AR7010_1_1;
1228         else
1229                 hif_dev->fw_name = FIRMWARE_AR9271;
1230
1231         ret = request_firmware_nowait(THIS_MODULE, true, hif_dev->fw_name,
1232                                       &hif_dev->udev->dev, GFP_KERNEL,
1233                                       hif_dev, ath9k_hif_usb_firmware_cb);
1234         if (ret) {
1235                 dev_err(&hif_dev->udev->dev,
1236                         "ath9k_htc: Async request for firmware %s failed\n",
1237                         hif_dev->fw_name);
1238                 goto err_fw_req;
1239         }
1240
1241         dev_info(&hif_dev->udev->dev, "ath9k_htc: Firmware %s requested\n",
1242                  hif_dev->fw_name);
1243
1244         return 0;
1245
1246 err_fw_req:
1247         usb_set_intfdata(interface, NULL);
1248         kfree(hif_dev);
1249         usb_put_dev(udev);
1250 err_alloc:
1251         return ret;
1252 }
1253
1254 static void ath9k_hif_usb_reboot(struct usb_device *udev)
1255 {
1256         u32 reboot_cmd = 0xffffffff;
1257         void *buf;
1258         int ret;
1259
1260         buf = kmemdup(&reboot_cmd, 4, GFP_KERNEL);
1261         if (!buf)
1262                 return;
1263
1264         ret = usb_bulk_msg(udev, usb_sndbulkpipe(udev, USB_REG_OUT_PIPE),
1265                            buf, 4, NULL, HZ);
1266         if (ret)
1267                 dev_err(&udev->dev, "ath9k_htc: USB reboot failed\n");
1268
1269         kfree(buf);
1270 }
1271
1272 static void ath9k_hif_usb_disconnect(struct usb_interface *interface)
1273 {
1274         struct usb_device *udev = interface_to_usbdev(interface);
1275         struct hif_device_usb *hif_dev = usb_get_intfdata(interface);
1276         bool unplugged = (udev->state == USB_STATE_NOTATTACHED) ? true : false;
1277
1278         if (!hif_dev)
1279                 return;
1280
1281         wait_for_completion(&hif_dev->fw_done);
1282
1283         if (hif_dev->flags & HIF_USB_READY) {
1284                 ath9k_htc_hw_deinit(hif_dev->htc_handle, unplugged);
1285                 ath9k_htc_hw_free(hif_dev->htc_handle);
1286                 ath9k_hif_usb_dev_deinit(hif_dev);
1287         }
1288
1289         usb_set_intfdata(interface, NULL);
1290
1291         if (!unplugged && (hif_dev->flags & HIF_USB_START))
1292                 ath9k_hif_usb_reboot(udev);
1293
1294         kfree(hif_dev);
1295         dev_info(&udev->dev, "ath9k_htc: USB layer deinitialized\n");
1296         usb_put_dev(udev);
1297 }
1298
1299 #ifdef CONFIG_PM
1300 static int ath9k_hif_usb_suspend(struct usb_interface *interface,
1301                                  pm_message_t message)
1302 {
1303         struct hif_device_usb *hif_dev = usb_get_intfdata(interface);
1304
1305         /*
1306          * The device has to be set to FULLSLEEP mode in case no
1307          * interface is up.
1308          */
1309         if (!(hif_dev->flags & HIF_USB_START))
1310                 ath9k_htc_suspend(hif_dev->htc_handle);
1311
1312         ath9k_hif_usb_dealloc_urbs(hif_dev);
1313
1314         return 0;
1315 }
1316
1317 static int ath9k_hif_usb_resume(struct usb_interface *interface)
1318 {
1319         struct hif_device_usb *hif_dev = usb_get_intfdata(interface);
1320         struct htc_target *htc_handle = hif_dev->htc_handle;
1321         int ret;
1322         const struct firmware *fw;
1323
1324         ret = ath9k_hif_usb_alloc_urbs(hif_dev);
1325         if (ret)
1326                 return ret;
1327
1328         if (hif_dev->flags & HIF_USB_READY) {
1329                 /* request cached firmware during suspend/resume cycle */
1330                 ret = request_firmware(&fw, hif_dev->fw_name,
1331                                        &hif_dev->udev->dev);
1332                 if (ret)
1333                         goto fail_resume;
1334
1335                 hif_dev->fw_data = fw->data;
1336                 hif_dev->fw_size = fw->size;
1337                 ret = ath9k_hif_usb_download_fw(hif_dev);
1338                 release_firmware(fw);
1339                 if (ret)
1340                         goto fail_resume;
1341         } else {
1342                 ath9k_hif_usb_dealloc_urbs(hif_dev);
1343                 return -EIO;
1344         }
1345
1346         mdelay(100);
1347
1348         ret = ath9k_htc_resume(htc_handle);
1349
1350         if (ret)
1351                 goto fail_resume;
1352
1353         return 0;
1354
1355 fail_resume:
1356         ath9k_hif_usb_dealloc_urbs(hif_dev);
1357
1358         return ret;
1359 }
1360 #endif
1361
1362 static struct usb_driver ath9k_hif_usb_driver = {
1363         .name = KBUILD_MODNAME,
1364         .probe = ath9k_hif_usb_probe,
1365         .disconnect = ath9k_hif_usb_disconnect,
1366 #ifdef CONFIG_PM
1367         .suspend = ath9k_hif_usb_suspend,
1368         .resume = ath9k_hif_usb_resume,
1369         .reset_resume = ath9k_hif_usb_resume,
1370 #endif
1371         .id_table = ath9k_hif_usb_ids,
1372         .soft_unbind = 1,
1373         .disable_hub_initiated_lpm = 1,
1374 };
1375
1376 int ath9k_hif_usb_init(void)
1377 {
1378         return usb_register(&ath9k_hif_usb_driver);
1379 }
1380
1381 void ath9k_hif_usb_exit(void)
1382 {
1383         usb_deregister(&ath9k_hif_usb_driver);
1384 }