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 MODULE_FIRMWARE(HTC_7010_MODULE_FW);
  21 MODULE_FIRMWARE(HTC_9271_MODULE_FW);
  22
  23 static struct usb_device_id ath9k_hif_usb_ids[] = {
  24         { USB_DEVICE(0x0cf3, 0x9271) }, /* Atheros */
  25         { USB_DEVICE(0x0cf3, 0x1006) }, /* Atheros */
  26         { USB_DEVICE(0x0846, 0x9030) }, /* Netgear N150 */
  27         { USB_DEVICE(0x07D1, 0x3A10) }, /* Dlink Wireless 150 */
  28         { USB_DEVICE(0x13D3, 0x3327) }, /* Azurewave */
  29         { USB_DEVICE(0x13D3, 0x3328) }, /* Azurewave */
  30         { USB_DEVICE(0x13D3, 0x3346) }, /* IMC Networks */
  31         { USB_DEVICE(0x13D3, 0x3348) }, /* Azurewave */
  32         { USB_DEVICE(0x13D3, 0x3349) }, /* Azurewave */
  33         { USB_DEVICE(0x13D3, 0x3350) }, /* Azurewave */
  34         { USB_DEVICE(0x04CA, 0x4605) }, /* Liteon */
  35         { USB_DEVICE(0x040D, 0x3801) }, /* VIA */
  36         { USB_DEVICE(0x0cf3, 0xb003) }, /* Ubiquiti WifiStation Ext */
  37         { USB_DEVICE(0x0cf3, 0xb002) }, /* Ubiquiti WifiStation */
  38         { USB_DEVICE(0x057c, 0x8403) }, /* AVM FRITZ!WLAN 11N v2 USB */
  39         { USB_DEVICE(0x0471, 0x209e) }, /* Philips (or NXP) PTA01 */
  40         { USB_DEVICE(0x1eda, 0x2315) }, /* AirTies */
  41
  42         { USB_DEVICE(0x0cf3, 0x7015),
  43           .driver_info = AR9287_USB },  /* Atheros */
  44         { USB_DEVICE(0x1668, 0x1200),
  45           .driver_info = AR9287_USB },  /* Verizon */
  46
  47         { USB_DEVICE(0x0cf3, 0x7010),
  48           .driver_info = AR9280_USB },  /* Atheros */
  49         { USB_DEVICE(0x0846, 0x9018),
  50           .driver_info = AR9280_USB },  /* Netgear WNDA3200 */
  51         { USB_DEVICE(0x083A, 0xA704),
  52           .driver_info = AR9280_USB },  /* SMC Networks */
  53         { USB_DEVICE(0x0411, 0x017f),
  54           .driver_info = AR9280_USB },  /* Sony UWA-BR100 */
  55         { USB_DEVICE(0x0411, 0x0197),
  56           .driver_info = AR9280_USB },  /* Buffalo WLI-UV-AG300P */
  57         { USB_DEVICE(0x04da, 0x3904),
  58           .driver_info = AR9280_USB },
  59         { USB_DEVICE(0x0930, 0x0a08),
  60           .driver_info = AR9280_USB },  /* Toshiba WLM-20U2 and GN-1080 */
  61
  62         { USB_DEVICE(0x0cf3, 0x20ff),
  63           .driver_info = STORAGE_DEVICE },
  64
  65         { },
  66 };
  67
  68 MODULE_DEVICE_TABLE(usb, ath9k_hif_usb_ids);
  69
  70 static int __hif_usb_tx(struct hif_device_usb *hif_dev);
  71
  72 static void hif_usb_regout_cb(struct urb *urb)
  73 {
  74         struct cmd_buf *cmd = (struct cmd_buf *)urb->context;
  75
  76         switch (urb->status) {
  77         case 0:
  78                 break;
  79         case -ENOENT:
  80         case -ECONNRESET:
  81         case -ENODEV:
  82         case -ESHUTDOWN:
  83                 goto free;
  84         default:
  85                 break;
  86         }
  87
  88         if (cmd) {
  89                 ath9k_htc_txcompletion_cb(cmd->hif_dev->htc_handle,
  90                                           cmd->skb, true);
  91                 kfree(cmd);
  92         }
  93
  94         return;
  95 free:
  96         kfree_skb(cmd->skb);
  97         kfree(cmd);
  98 }
  99
 100 static int hif_usb_send_regout(struct hif_device_usb *hif_dev,
 101                                struct sk_buff *skb)
 102 {
 103         struct urb *urb;
 104         struct cmd_buf *cmd;
 105         int ret = 0;
 106
 107         urb = usb_alloc_urb(0, GFP_KERNEL);
 108         if (urb == NULL)
 109                 return -ENOMEM;
 110
 111         cmd = kzalloc(sizeof(*cmd), GFP_KERNEL);
 112         if (cmd == NULL) {
 113                 usb_free_urb(urb);
 114                 return -ENOMEM;
 115         }
 116
 117         cmd->skb = skb;
 118         cmd->hif_dev = hif_dev;
 119
 120         usb_fill_int_urb(urb, hif_dev->udev,
 121                          usb_sndintpipe(hif_dev->udev, USB_REG_OUT_PIPE),
 122                          skb->data, skb->len,
 123                          hif_usb_regout_cb, cmd, 1);
 124
 125         usb_anchor_urb(urb, &hif_dev->regout_submitted);
 126         ret = usb_submit_urb(urb, GFP_KERNEL);
 127         if (ret) {
 128                 usb_unanchor_urb(urb);
 129                 kfree(cmd);
 130         }
 131         usb_free_urb(urb);
 132
 133         return ret;
 134 }
 135
 136 static void hif_usb_mgmt_cb(struct urb *urb)
 137 {
 138         struct cmd_buf *cmd = (struct cmd_buf *)urb->context;
 139         struct hif_device_usb *hif_dev;
 140         bool txok = true;
 141
 142         if (!cmd || !cmd->skb || !cmd->hif_dev)
 143                 return;
 144
 145         hif_dev = cmd->hif_dev;
 146
 147         switch (urb->status) {
 148         case 0:
 149                 break;
 150         case -ENOENT:
 151         case -ECONNRESET:
 152         case -ENODEV:
 153         case -ESHUTDOWN:
 154                 txok = false;
 155
 156                 /*
 157                  * If the URBs are being flushed, no need to complete
 158                  * this packet.
 159                  */
 160                 spin_lock(&hif_dev->tx.tx_lock);
 161                 if (hif_dev->tx.flags & HIF_USB_TX_FLUSH) {
 162                         spin_unlock(&hif_dev->tx.tx_lock);
 163                         dev_kfree_skb_any(cmd->skb);
 164                         kfree(cmd);
 165                         return;
 166                 }
 167                 spin_unlock(&hif_dev->tx.tx_lock);
 168
 169                 break;
 170         default:
 171                 txok = false;
 172                 break;
 173         }
 174
 175         skb_pull(cmd->skb, 4);
 176         ath9k_htc_txcompletion_cb(cmd->hif_dev->htc_handle,
 177                                   cmd->skb, txok);
 178         kfree(cmd);
 179 }
 180
 181 static int hif_usb_send_mgmt(struct hif_device_usb *hif_dev,
 182                              struct sk_buff *skb)
 183 {
 184         struct urb *urb;
 185         struct cmd_buf *cmd;
 186         int ret = 0;
 187         __le16 *hdr;
 188
 189         urb = usb_alloc_urb(0, GFP_ATOMIC);
 190         if (urb == NULL)
 191                 return -ENOMEM;
 192
 193         cmd = kzalloc(sizeof(*cmd), GFP_ATOMIC);
 194         if (cmd == NULL) {
 195                 usb_free_urb(urb);
 196                 return -ENOMEM;
 197         }
 198
 199         cmd->skb = skb;
 200         cmd->hif_dev = hif_dev;
 201
 202         hdr = (__le16 *) skb_push(skb, 4);
 203         *hdr++ = cpu_to_le16(skb->len - 4);
 204         *hdr++ = cpu_to_le16(ATH_USB_TX_STREAM_MODE_TAG);
 205
 206         usb_fill_bulk_urb(urb, hif_dev->udev,
 207                          usb_sndbulkpipe(hif_dev->udev, USB_WLAN_TX_PIPE),
 208                          skb->data, skb->len,
 209                          hif_usb_mgmt_cb, cmd);
 210
 211         usb_anchor_urb(urb, &hif_dev->mgmt_submitted);
 212         ret = usb_submit_urb(urb, GFP_ATOMIC);
 213         if (ret) {
 214                 usb_unanchor_urb(urb);
 215                 kfree(cmd);
 216         }
 217         usb_free_urb(urb);
 218
 219         return ret;
 220 }
 221
 222 static inline void ath9k_skb_queue_purge(struct hif_device_usb *hif_dev,
 223                                          struct sk_buff_head *list)
 224 {
 225         struct sk_buff *skb;
 226
 227         while ((skb = __skb_dequeue(list)) != NULL) {
 228                 dev_kfree_skb_any(skb);
 229         }
 230 }
 231
 232 static inline void ath9k_skb_queue_complete(struct hif_device_usb *hif_dev,
 233                                             struct sk_buff_head *queue,
 234                                             bool txok)
 235 {
 236         struct sk_buff *skb;
 237
 238         while ((skb = __skb_dequeue(queue)) != NULL) {
 239 #ifdef CONFIG_ATH9K_HTC_DEBUGFS
 240                 int ln = skb->len;
 241 #endif
 242                 ath9k_htc_txcompletion_cb(hif_dev->htc_handle,
 243                                           skb, txok);
 244                 if (txok) {
 245                         TX_STAT_INC(skb_success);
 246                         TX_STAT_ADD(skb_success_bytes, ln);
 247                 }
 248                 else
 249                         TX_STAT_INC(skb_failed);
 250         }
 251 }
 252
 253 static void hif_usb_tx_cb(struct urb *urb)
 254 {
 255         struct tx_buf *tx_buf = (struct tx_buf *) urb->context;
 256         struct hif_device_usb *hif_dev;
 257         bool txok = true;
 258
 259         if (!tx_buf || !tx_buf->hif_dev)
 260                 return;
 261
 262         hif_dev = tx_buf->hif_dev;
 263
 264         switch (urb->status) {
 265         case 0:
 266                 break;
 267         case -ENOENT:
 268         case -ECONNRESET:
 269         case -ENODEV:
 270         case -ESHUTDOWN:
 271                 txok = false;
 272
 273                 /*
 274                  * If the URBs are being flushed, no need to add this
 275                  * URB to the free list.
 276                  */
 277                 spin_lock(&hif_dev->tx.tx_lock);
 278                 if (hif_dev->tx.flags & HIF_USB_TX_FLUSH) {
 279                         spin_unlock(&hif_dev->tx.tx_lock);
 280                         ath9k_skb_queue_purge(hif_dev, &tx_buf->skb_queue);
 281                         return;
 282                 }
 283                 spin_unlock(&hif_dev->tx.tx_lock);
 284
 285                 break;
 286         default:
 287                 txok = false;
 288                 break;
 289         }
 290
 291         ath9k_skb_queue_complete(hif_dev, &tx_buf->skb_queue, txok);
 292
 293         /* Re-initialize the SKB queue */
 294         tx_buf->len = tx_buf->offset = 0;
 295         __skb_queue_head_init(&tx_buf->skb_queue);
 296
 297         /* Add this TX buffer to the free list */
 298         spin_lock(&hif_dev->tx.tx_lock);
 299         list_move_tail(&tx_buf->list, &hif_dev->tx.tx_buf);
 300         hif_dev->tx.tx_buf_cnt++;
 301         if (!(hif_dev->tx.flags & HIF_USB_TX_STOP))
 302                 __hif_usb_tx(hif_dev); /* Check for pending SKBs */
 303         TX_STAT_INC(buf_completed);
 304         spin_unlock(&hif_dev->tx.tx_lock);
 305 }
 306
 307 /* TX lock has to be taken */
 308 static int __hif_usb_tx(struct hif_device_usb *hif_dev)
 309 {
 310         struct tx_buf *tx_buf = NULL;
 311         struct sk_buff *nskb = NULL;
 312         int ret = 0, i;
 313         u16 tx_skb_cnt = 0;
 314         u8 *buf;
 315         __le16 *hdr;
 316
 317         if (hif_dev->tx.tx_skb_cnt == 0)
 318                 return 0;
 319
 320         /* Check if a free TX buffer is available */
 321         if (list_empty(&hif_dev->tx.tx_buf))
 322                 return 0;
 323
 324         tx_buf = list_first_entry(&hif_dev->tx.tx_buf, struct tx_buf, list);
 325         list_move_tail(&tx_buf->list, &hif_dev->tx.tx_pending);
 326         hif_dev->tx.tx_buf_cnt--;
 327
 328         tx_skb_cnt = min_t(u16, hif_dev->tx.tx_skb_cnt, MAX_TX_AGGR_NUM);
 329
 330         for (i = 0; i < tx_skb_cnt; i++) {
 331                 nskb = __skb_dequeue(&hif_dev->tx.tx_skb_queue);
 332
 333                 /* Should never be NULL */
 334                 BUG_ON(!nskb);
 335
 336                 hif_dev->tx.tx_skb_cnt--;
 337
 338                 buf = tx_buf->buf;
 339                 buf += tx_buf->offset;
 340                 hdr = (__le16 *)buf;
 341                 *hdr++ = cpu_to_le16(nskb->len);
 342                 *hdr++ = cpu_to_le16(ATH_USB_TX_STREAM_MODE_TAG);
 343                 buf += 4;
 344                 memcpy(buf, nskb->data, nskb->len);
 345                 tx_buf->len = nskb->len + 4;
 346
 347                 if (i < (tx_skb_cnt - 1))
 348                         tx_buf->offset += (((tx_buf->len - 1) / 4) + 1) * 4;
 349
 350                 if (i == (tx_skb_cnt - 1))
 351                         tx_buf->len += tx_buf->offset;
 352
 353                 __skb_queue_tail(&tx_buf->skb_queue, nskb);
 354                 TX_STAT_INC(skb_queued);
 355         }
 356
 357         usb_fill_bulk_urb(tx_buf->urb, hif_dev->udev,
 358                           usb_sndbulkpipe(hif_dev->udev, USB_WLAN_TX_PIPE),
 359                           tx_buf->buf, tx_buf->len,
 360                           hif_usb_tx_cb, tx_buf);
 361
 362         ret = usb_submit_urb(tx_buf->urb, GFP_ATOMIC);
 363         if (ret) {
 364                 tx_buf->len = tx_buf->offset = 0;
 365                 ath9k_skb_queue_complete(hif_dev, &tx_buf->skb_queue, false);
 366                 __skb_queue_head_init(&tx_buf->skb_queue);
 367                 list_move_tail(&tx_buf->list, &hif_dev->tx.tx_buf);
 368                 hif_dev->tx.tx_buf_cnt++;
 369         }
 370
 371         if (!ret)
 372                 TX_STAT_INC(buf_queued);
 373
 374         return ret;
 375 }
 376
 377 static int hif_usb_send_tx(struct hif_device_usb *hif_dev, struct sk_buff *skb)
 378 {
 379         struct ath9k_htc_tx_ctl *tx_ctl;
 380         unsigned long flags;
 381         int ret = 0;
 382
 383         spin_lock_irqsave(&hif_dev->tx.tx_lock, flags);
 384
 385         if (hif_dev->tx.flags & HIF_USB_TX_STOP) {
 386                 spin_unlock_irqrestore(&hif_dev->tx.tx_lock, flags);
 387                 return -ENODEV;
 388         }
 389
 390         /* Check if the max queue count has been reached */
 391         if (hif_dev->tx.tx_skb_cnt > MAX_TX_BUF_NUM) {
 392                 spin_unlock_irqrestore(&hif_dev->tx.tx_lock, flags);
 393                 return -ENOMEM;
 394         }
 395
 396         spin_unlock_irqrestore(&hif_dev->tx.tx_lock, flags);
 397
 398         tx_ctl = HTC_SKB_CB(skb);
 399
 400         /* Mgmt/Beacon frames don't use the TX buffer pool */
 401         if ((tx_ctl->type == ATH9K_HTC_MGMT) ||
 402             (tx_ctl->type == ATH9K_HTC_BEACON)) {
 403                 ret = hif_usb_send_mgmt(hif_dev, skb);
 404         }
 405
 406         spin_lock_irqsave(&hif_dev->tx.tx_lock, flags);
 407
 408         if ((tx_ctl->type == ATH9K_HTC_NORMAL) ||
 409             (tx_ctl->type == ATH9K_HTC_AMPDU)) {
 410                 __skb_queue_tail(&hif_dev->tx.tx_skb_queue, skb);
 411                 hif_dev->tx.tx_skb_cnt++;
 412         }
 413
 414         /* Check if AMPDUs have to be sent immediately */
 415         if ((hif_dev->tx.tx_buf_cnt == MAX_TX_URB_NUM) &&
 416             (hif_dev->tx.tx_skb_cnt < 2)) {
 417                 __hif_usb_tx(hif_dev);
 418         }
 419
 420         spin_unlock_irqrestore(&hif_dev->tx.tx_lock, flags);
 421
 422         return ret;
 423 }
 424
 425 static void hif_usb_start(void *hif_handle)
 426 {
 427         struct hif_device_usb *hif_dev = (struct hif_device_usb *)hif_handle;
 428         unsigned long flags;
 429
 430         hif_dev->flags |= HIF_USB_START;
 431
 432         spin_lock_irqsave(&hif_dev->tx.tx_lock, flags);
 433         hif_dev->tx.flags &= ~HIF_USB_TX_STOP;
 434         spin_unlock_irqrestore(&hif_dev->tx.tx_lock, flags);
 435 }
 436
 437 static void hif_usb_stop(void *hif_handle)
 438 {
 439         struct hif_device_usb *hif_dev = (struct hif_device_usb *)hif_handle;
 440         struct tx_buf *tx_buf = NULL, *tx_buf_tmp = NULL;
 441         unsigned long flags;
 442
 443         spin_lock_irqsave(&hif_dev->tx.tx_lock, flags);
 444         ath9k_skb_queue_complete(hif_dev, &hif_dev->tx.tx_skb_queue, false);
 445         hif_dev->tx.tx_skb_cnt = 0;
 446         hif_dev->tx.flags |= HIF_USB_TX_STOP;
 447         spin_unlock_irqrestore(&hif_dev->tx.tx_lock, flags);
 448
 449         /* The pending URBs have to be canceled. */
 450         list_for_each_entry_safe(tx_buf, tx_buf_tmp,
 451                                  &hif_dev->tx.tx_pending, list) {
 452                 usb_kill_urb(tx_buf->urb);
 453         }
 454
 455         usb_kill_anchored_urbs(&hif_dev->mgmt_submitted);
 456 }
 457
 458 static int hif_usb_send(void *hif_handle, u8 pipe_id, struct sk_buff *skb)
 459 {
 460         struct hif_device_usb *hif_dev = (struct hif_device_usb *)hif_handle;
 461         int ret = 0;
 462
 463         switch (pipe_id) {
 464         case USB_WLAN_TX_PIPE:
 465                 ret = hif_usb_send_tx(hif_dev, skb);
 466                 break;
 467         case USB_REG_OUT_PIPE:
 468                 ret = hif_usb_send_regout(hif_dev, skb);
 469                 break;
 470         default:
 471                 dev_err(&hif_dev->udev->dev,
 472                         "ath9k_htc: Invalid TX pipe: %d\n", pipe_id);
 473                 ret = -EINVAL;
 474                 break;
 475         }
 476
 477         return ret;
 478 }
 479
 480 static inline bool check_index(struct sk_buff *skb, u8 idx)
 481 {
 482         struct ath9k_htc_tx_ctl *tx_ctl;
 483
 484         tx_ctl = HTC_SKB_CB(skb);
 485
 486         if ((tx_ctl->type == ATH9K_HTC_AMPDU) &&
 487             (tx_ctl->sta_idx == idx))
 488                 return true;
 489
 490         return false;
 491 }
 492
 493 static void hif_usb_sta_drain(void *hif_handle, u8 idx)
 494 {
 495         struct hif_device_usb *hif_dev = (struct hif_device_usb *)hif_handle;
 496         struct sk_buff *skb, *tmp;
 497         unsigned long flags;
 498
 499         spin_lock_irqsave(&hif_dev->tx.tx_lock, flags);
 500
 501         skb_queue_walk_safe(&hif_dev->tx.tx_skb_queue, skb, tmp) {
 502                 if (check_index(skb, idx)) {
 503                         __skb_unlink(skb, &hif_dev->tx.tx_skb_queue);
 504                         ath9k_htc_txcompletion_cb(hif_dev->htc_handle,
 505                                                   skb, false);
 506                         hif_dev->tx.tx_skb_cnt--;
 507                         TX_STAT_INC(skb_failed);
 508                 }
 509         }
 510
 511         spin_unlock_irqrestore(&hif_dev->tx.tx_lock, flags);
 512 }
 513
 514 static struct ath9k_htc_hif hif_usb = {
 515         .transport = ATH9K_HIF_USB,
 516         .name = "ath9k_hif_usb",
 517
 518         .control_ul_pipe = USB_REG_OUT_PIPE,
 519         .control_dl_pipe = USB_REG_IN_PIPE,
 520
 521         .start = hif_usb_start,
 522         .stop = hif_usb_stop,
 523         .sta_drain = hif_usb_sta_drain,
 524         .send = hif_usb_send,
 525 };
 526
 527 static void ath9k_hif_usb_rx_stream(struct hif_device_usb *hif_dev,
 528                                     struct sk_buff *skb)
 529 {
 530         struct sk_buff *nskb, *skb_pool[MAX_PKT_NUM_IN_TRANSFER];
 531         int index = 0, i, len = skb->len;
 532         int rx_remain_len, rx_pkt_len;
 533         u16 pool_index = 0;
 534         u8 *ptr;
 535
 536         spin_lock(&hif_dev->rx_lock);
 537
 538         rx_remain_len = hif_dev->rx_remain_len;
 539         rx_pkt_len = hif_dev->rx_transfer_len;
 540
 541         if (rx_remain_len != 0) {
 542                 struct sk_buff *remain_skb = hif_dev->remain_skb;
 543
 544                 if (remain_skb) {
 545                         ptr = (u8 *) remain_skb->data;
 546
 547                         index = rx_remain_len;
 548                         rx_remain_len -= hif_dev->rx_pad_len;
 549                         ptr += rx_pkt_len;
 550
 551                         memcpy(ptr, skb->data, rx_remain_len);
 552
 553                         rx_pkt_len += rx_remain_len;
 554                         hif_dev->rx_remain_len = 0;
 555                         skb_put(remain_skb, rx_pkt_len);
 556
 557                         skb_pool[pool_index++] = remain_skb;
 558
 559                 } else {
 560                         index = rx_remain_len;
 561                 }
 562         }
 563
 564         spin_unlock(&hif_dev->rx_lock);
 565
 566         while (index < len) {
 567                 u16 pkt_len;
 568                 u16 pkt_tag;
 569                 u16 pad_len;
 570                 int chk_idx;
 571
 572                 ptr = (u8 *) skb->data;
 573
 574                 pkt_len = get_unaligned_le16(ptr + index);
 575                 pkt_tag = get_unaligned_le16(ptr + index + 2);
 576
 577                 if (pkt_tag != ATH_USB_RX_STREAM_MODE_TAG) {
 578                         RX_STAT_INC(skb_dropped);
 579                         return;
 580                 }
 581
 582                 pad_len = 4 - (pkt_len & 0x3);
 583                 if (pad_len == 4)
 584                         pad_len = 0;
 585
 586                 chk_idx = index;
 587                 index = index + 4 + pkt_len + pad_len;
 588
 589                 if (index > MAX_RX_BUF_SIZE) {
 590                         spin_lock(&hif_dev->rx_lock);
 591                         hif_dev->rx_remain_len = index - MAX_RX_BUF_SIZE;
 592                         hif_dev->rx_transfer_len =
 593                                 MAX_RX_BUF_SIZE - chk_idx - 4;
 594                         hif_dev->rx_pad_len = pad_len;
 595
 596                         nskb = __dev_alloc_skb(pkt_len + 32, GFP_ATOMIC);
 597                         if (!nskb) {
 598                                 dev_err(&hif_dev->udev->dev,
 599                                         "ath9k_htc: RX memory allocation error\n");
 600                                 spin_unlock(&hif_dev->rx_lock);
 601                                 goto err;
 602                         }
 603                         skb_reserve(nskb, 32);
 604                         RX_STAT_INC(skb_allocated);
 605
 606                         memcpy(nskb->data, &(skb->data[chk_idx+4]),
 607                                hif_dev->rx_transfer_len);
 608
 609                         /* Record the buffer pointer */
 610                         hif_dev->remain_skb = nskb;
 611                         spin_unlock(&hif_dev->rx_lock);
 612                 } else {
 613                         nskb = __dev_alloc_skb(pkt_len + 32, GFP_ATOMIC);
 614                         if (!nskb) {
 615                                 dev_err(&hif_dev->udev->dev,
 616                                         "ath9k_htc: RX memory allocation error\n");
 617                                 goto err;
 618                         }
 619                         skb_reserve(nskb, 32);
 620                         RX_STAT_INC(skb_allocated);
 621
 622                         memcpy(nskb->data, &(skb->data[chk_idx+4]), pkt_len);
 623                         skb_put(nskb, pkt_len);
 624                         skb_pool[pool_index++] = nskb;
 625                 }
 626         }
 627
 628 err:
 629         for (i = 0; i < pool_index; i++) {
 630                 RX_STAT_ADD(skb_completed_bytes, skb_pool[i]->len);
 631                 ath9k_htc_rx_msg(hif_dev->htc_handle, skb_pool[i],
 632                                  skb_pool[i]->len, USB_WLAN_RX_PIPE);
 633                 RX_STAT_INC(skb_completed);
 634         }
 635 }
 636
 637 static void ath9k_hif_usb_rx_cb(struct urb *urb)
 638 {
 639         struct sk_buff *skb = (struct sk_buff *) urb->context;
 640         struct hif_device_usb *hif_dev =
 641                 usb_get_intfdata(usb_ifnum_to_if(urb->dev, 0));
 642         int ret;
 643
 644         if (!skb)
 645                 return;
 646
 647         if (!hif_dev)
 648                 goto free;
 649
 650         switch (urb->status) {
 651         case 0:
 652                 break;
 653         case -ENOENT:
 654         case -ECONNRESET:
 655         case -ENODEV:
 656         case -ESHUTDOWN:
 657                 goto free;
 658         default:
 659                 goto resubmit;
 660         }
 661
 662         if (likely(urb->actual_length != 0)) {
 663                 skb_put(skb, urb->actual_length);
 664                 ath9k_hif_usb_rx_stream(hif_dev, skb);
 665         }
 666
 667 resubmit:
 668         skb_reset_tail_pointer(skb);
 669         skb_trim(skb, 0);
 670
 671         usb_anchor_urb(urb, &hif_dev->rx_submitted);
 672         ret = usb_submit_urb(urb, GFP_ATOMIC);
 673         if (ret) {
 674                 usb_unanchor_urb(urb);
 675                 goto free;
 676         }
 677
 678         return;
 679 free:
 680         kfree_skb(skb);
 681 }
 682
 683 static void ath9k_hif_usb_reg_in_cb(struct urb *urb)
 684 {
 685         struct sk_buff *skb = (struct sk_buff *) urb->context;
 686         struct sk_buff *nskb;
 687         struct hif_device_usb *hif_dev =
 688                 usb_get_intfdata(usb_ifnum_to_if(urb->dev, 0));
 689         int ret;
 690
 691         if (!skb)
 692                 return;
 693
 694         if (!hif_dev)
 695                 goto free;
 696
 697         switch (urb->status) {
 698         case 0:
 699                 break;
 700         case -ENOENT:
 701         case -ECONNRESET:
 702         case -ENODEV:
 703         case -ESHUTDOWN:
 704                 goto free;
 705         default:
 706                 skb_reset_tail_pointer(skb);
 707                 skb_trim(skb, 0);
 708
 709                 goto resubmit;
 710         }
 711
 712         if (likely(urb->actual_length != 0)) {
 713                 skb_put(skb, urb->actual_length);
 714
 715                 /* Process the command first */
 716                 ath9k_htc_rx_msg(hif_dev->htc_handle, skb,
 717                                  skb->len, USB_REG_IN_PIPE);
 718
 719
 720                 nskb = alloc_skb(MAX_REG_IN_BUF_SIZE, GFP_ATOMIC);
 721                 if (!nskb) {
 722                         dev_err(&hif_dev->udev->dev,
 723                                 "ath9k_htc: REG_IN memory allocation failure\n");
 724                         urb->context = NULL;
 725                         return;
 726                 }
 727
 728                 usb_fill_int_urb(urb, hif_dev->udev,
 729                                  usb_rcvintpipe(hif_dev->udev,
 730                                                  USB_REG_IN_PIPE),
 731                                  nskb->data, MAX_REG_IN_BUF_SIZE,
 732                                  ath9k_hif_usb_reg_in_cb, nskb, 1);
 733         }
 734
 735 resubmit:
 736         usb_anchor_urb(urb, &hif_dev->reg_in_submitted);
 737         ret = usb_submit_urb(urb, GFP_ATOMIC);
 738         if (ret) {
 739                 usb_unanchor_urb(urb);
 740                 goto free;
 741         }
 742
 743         return;
 744 free:
 745         kfree_skb(skb);
 746         urb->context = NULL;
 747 }
 748
 749 static void ath9k_hif_usb_dealloc_tx_urbs(struct hif_device_usb *hif_dev)
 750 {
 751         struct tx_buf *tx_buf = NULL, *tx_buf_tmp = NULL;
 752         unsigned long flags;
 753
 754         list_for_each_entry_safe(tx_buf, tx_buf_tmp,
 755                                  &hif_dev->tx.tx_buf, list) {
 756                 usb_kill_urb(tx_buf->urb);
 757                 list_del(&tx_buf->list);
 758                 usb_free_urb(tx_buf->urb);
 759                 kfree(tx_buf->buf);
 760                 kfree(tx_buf);
 761         }
 762
 763         spin_lock_irqsave(&hif_dev->tx.tx_lock, flags);
 764         hif_dev->tx.flags |= HIF_USB_TX_FLUSH;
 765         spin_unlock_irqrestore(&hif_dev->tx.tx_lock, flags);
 766
 767         list_for_each_entry_safe(tx_buf, tx_buf_tmp,
 768                                  &hif_dev->tx.tx_pending, list) {
 769                 usb_kill_urb(tx_buf->urb);
 770                 list_del(&tx_buf->list);
 771                 usb_free_urb(tx_buf->urb);
 772                 kfree(tx_buf->buf);
 773                 kfree(tx_buf);
 774         }
 775
 776         usb_kill_anchored_urbs(&hif_dev->mgmt_submitted);
 777 }
 778
 779 static int ath9k_hif_usb_alloc_tx_urbs(struct hif_device_usb *hif_dev)
 780 {
 781         struct tx_buf *tx_buf;
 782         int i;
 783
 784         INIT_LIST_HEAD(&hif_dev->tx.tx_buf);
 785         INIT_LIST_HEAD(&hif_dev->tx.tx_pending);
 786         spin_lock_init(&hif_dev->tx.tx_lock);
 787         __skb_queue_head_init(&hif_dev->tx.tx_skb_queue);
 788         init_usb_anchor(&hif_dev->mgmt_submitted);
 789
 790         for (i = 0; i < MAX_TX_URB_NUM; i++) {
 791                 tx_buf = kzalloc(sizeof(struct tx_buf), GFP_KERNEL);
 792                 if (!tx_buf)
 793                         goto err;
 794
 795                 tx_buf->buf = kzalloc(MAX_TX_BUF_SIZE, GFP_KERNEL);
 796                 if (!tx_buf->buf)
 797                         goto err;
 798
 799                 tx_buf->urb = usb_alloc_urb(0, GFP_KERNEL);
 800                 if (!tx_buf->urb)
 801                         goto err;
 802
 803                 tx_buf->hif_dev = hif_dev;
 804                 __skb_queue_head_init(&tx_buf->skb_queue);
 805
 806                 list_add_tail(&tx_buf->list, &hif_dev->tx.tx_buf);
 807         }
 808
 809         hif_dev->tx.tx_buf_cnt = MAX_TX_URB_NUM;
 810
 811         return 0;
 812 err:
 813         if (tx_buf) {
 814                 kfree(tx_buf->buf);
 815                 kfree(tx_buf);
 816         }
 817         ath9k_hif_usb_dealloc_tx_urbs(hif_dev);
 818         return -ENOMEM;
 819 }
 820
 821 static void ath9k_hif_usb_dealloc_rx_urbs(struct hif_device_usb *hif_dev)
 822 {
 823         usb_kill_anchored_urbs(&hif_dev->rx_submitted);
 824 }
 825
 826 static int ath9k_hif_usb_alloc_rx_urbs(struct hif_device_usb *hif_dev)
 827 {
 828         struct urb *urb = NULL;
 829         struct sk_buff *skb = NULL;
 830         int i, ret;
 831
 832         init_usb_anchor(&hif_dev->rx_submitted);
 833         spin_lock_init(&hif_dev->rx_lock);
 834
 835         for (i = 0; i < MAX_RX_URB_NUM; i++) {
 836
 837                 /* Allocate URB */
 838                 urb = usb_alloc_urb(0, GFP_KERNEL);
 839                 if (urb == NULL) {
 840                         ret = -ENOMEM;
 841                         goto err_urb;
 842                 }
 843
 844                 /* Allocate buffer */
 845                 skb = alloc_skb(MAX_RX_BUF_SIZE, GFP_KERNEL);
 846                 if (!skb) {
 847                         ret = -ENOMEM;
 848                         goto err_skb;
 849                 }
 850
 851                 usb_fill_bulk_urb(urb, hif_dev->udev,
 852                                   usb_rcvbulkpipe(hif_dev->udev,
 853                                                   USB_WLAN_RX_PIPE),
 854                                   skb->data, MAX_RX_BUF_SIZE,
 855                                   ath9k_hif_usb_rx_cb, skb);
 856
 857                 /* Anchor URB */
 858                 usb_anchor_urb(urb, &hif_dev->rx_submitted);
 859
 860                 /* Submit URB */
 861                 ret = usb_submit_urb(urb, GFP_KERNEL);
 862                 if (ret) {
 863                         usb_unanchor_urb(urb);
 864                         goto err_submit;
 865                 }
 866
 867                 /*
 868                  * Drop reference count.
 869                  * This ensures that the URB is freed when killing them.
 870                  */
 871                 usb_free_urb(urb);
 872         }
 873
 874         return 0;
 875
 876 err_submit:
 877         kfree_skb(skb);
 878 err_skb:
 879         usb_free_urb(urb);
 880 err_urb:
 881         ath9k_hif_usb_dealloc_rx_urbs(hif_dev);
 882         return ret;
 883 }
 884
 885 static void ath9k_hif_usb_dealloc_reg_in_urbs(struct hif_device_usb *hif_dev)
 886 {
 887         usb_kill_anchored_urbs(&hif_dev->reg_in_submitted);
 888 }
 889
 890 static int ath9k_hif_usb_alloc_reg_in_urbs(struct hif_device_usb *hif_dev)
 891 {
 892         struct urb *urb = NULL;
 893         struct sk_buff *skb = NULL;
 894         int i, ret;
 895
 896         init_usb_anchor(&hif_dev->reg_in_submitted);
 897
 898         for (i = 0; i < MAX_REG_IN_URB_NUM; i++) {
 899
 900                 /* Allocate URB */
 901                 urb = usb_alloc_urb(0, GFP_KERNEL);
 902                 if (urb == NULL) {
 903                         ret = -ENOMEM;
 904                         goto err_urb;
 905                 }
 906
 907                 /* Allocate buffer */
 908                 skb = alloc_skb(MAX_REG_IN_BUF_SIZE, GFP_KERNEL);
 909                 if (!skb) {
 910                         ret = -ENOMEM;
 911                         goto err_skb;
 912                 }
 913
 914                 usb_fill_int_urb(urb, hif_dev->udev,
 915                                   usb_rcvintpipe(hif_dev->udev,
 916                                                   USB_REG_IN_PIPE),
 917                                   skb->data, MAX_REG_IN_BUF_SIZE,
 918                                   ath9k_hif_usb_reg_in_cb, skb, 1);
 919
 920                 /* Anchor URB */
 921                 usb_anchor_urb(urb, &hif_dev->reg_in_submitted);
 922
 923                 /* Submit URB */
 924                 ret = usb_submit_urb(urb, GFP_KERNEL);
 925                 if (ret) {
 926                         usb_unanchor_urb(urb);
 927                         goto err_submit;
 928                 }
 929
 930                 /*
 931                  * Drop reference count.
 932                  * This ensures that the URB is freed when killing them.
 933                  */
 934                 usb_free_urb(urb);
 935         }
 936
 937         return 0;
 938
 939 err_submit:
 940         kfree_skb(skb);
 941 err_skb:
 942         usb_free_urb(urb);
 943 err_urb:
 944         ath9k_hif_usb_dealloc_reg_in_urbs(hif_dev);
 945         return ret;
 946 }
 947
 948 static int ath9k_hif_usb_alloc_urbs(struct hif_device_usb *hif_dev)
 949 {
 950         /* Register Write */
 951         init_usb_anchor(&hif_dev->regout_submitted);
 952
 953         /* TX */
 954         if (ath9k_hif_usb_alloc_tx_urbs(hif_dev) < 0)
 955                 goto err;
 956
 957         /* RX */
 958         if (ath9k_hif_usb_alloc_rx_urbs(hif_dev) < 0)
 959                 goto err_rx;
 960
 961         /* Register Read */
 962         if (ath9k_hif_usb_alloc_reg_in_urbs(hif_dev) < 0)
 963                 goto err_reg;
 964
 965         return 0;
 966 err_reg:
 967         ath9k_hif_usb_dealloc_rx_urbs(hif_dev);
 968 err_rx:
 969         ath9k_hif_usb_dealloc_tx_urbs(hif_dev);
 970 err:
 971         return -ENOMEM;
 972 }
 973
 974 static void ath9k_hif_usb_dealloc_urbs(struct hif_device_usb *hif_dev)
 975 {
 976         usb_kill_anchored_urbs(&hif_dev->regout_submitted);
 977         ath9k_hif_usb_dealloc_reg_in_urbs(hif_dev);
 978         ath9k_hif_usb_dealloc_tx_urbs(hif_dev);
 979         ath9k_hif_usb_dealloc_rx_urbs(hif_dev);
 980 }
 981
 982 static int ath9k_hif_usb_download_fw(struct hif_device_usb *hif_dev)
 983 {
 984         int transfer, err;
 985         const void *data = hif_dev->fw_data;
 986         size_t len = hif_dev->fw_size;
 987         u32 addr = AR9271_FIRMWARE;
 988         u8 *buf = kzalloc(4096, GFP_KERNEL);
 989         u32 firm_offset;
 990
 991         if (!buf)
 992                 return -ENOMEM;
 993
 994         while (len) {
 995                 transfer = min_t(size_t, len, 4096);
 996                 memcpy(buf, data, transfer);
 997
 998                 err = usb_control_msg(hif_dev->udev,
 999                                       usb_sndctrlpipe(hif_dev->udev, 0),
1000                                       FIRMWARE_DOWNLOAD, 0x40 | USB_DIR_OUT,
1001                                       addr >> 8, 0, buf, transfer,
1002                                       USB_MSG_TIMEOUT);
1003                 if (err < 0) {
1004                         kfree(buf);
1005                         return err;
1006                 }
1007
1008                 len -= transfer;
1009                 data += transfer;
1010                 addr += transfer;
1011         }
1012         kfree(buf);
1013
1014         if (IS_AR7010_DEVICE(hif_dev->usb_device_id->driver_info))
1015                 firm_offset = AR7010_FIRMWARE_TEXT;
1016         else
1017                 firm_offset = AR9271_FIRMWARE_TEXT;
1018
1019         /*
1020          * Issue FW download complete command to firmware.
1021          */
1022         err = usb_control_msg(hif_dev->udev, usb_sndctrlpipe(hif_dev->udev, 0),
1023                               FIRMWARE_DOWNLOAD_COMP,
1024                               0x40 | USB_DIR_OUT,
1025                               firm_offset >> 8, 0, NULL, 0, USB_MSG_TIMEOUT);
1026         if (err)
1027                 return -EIO;
1028
1029         dev_info(&hif_dev->udev->dev, "ath9k_htc: Transferred FW: %s, size: %ld\n",
1030                  hif_dev->fw_name, (unsigned long) hif_dev->fw_size);
1031
1032         return 0;
1033 }
1034
1035 static int ath9k_hif_usb_dev_init(struct hif_device_usb *hif_dev)
1036 {
1037         int ret;
1038
1039         ret = ath9k_hif_usb_download_fw(hif_dev);
1040         if (ret) {
1041                 dev_err(&hif_dev->udev->dev,
1042                         "ath9k_htc: Firmware - %s download failed\n",
1043                         hif_dev->fw_name);
1044                 return ret;
1045         }
1046
1047         /* Alloc URBs */
1048         ret = ath9k_hif_usb_alloc_urbs(hif_dev);
1049         if (ret) {
1050                 dev_err(&hif_dev->udev->dev,
1051                         "ath9k_htc: Unable to allocate URBs\n");
1052                 return ret;
1053         }
1054
1055         return 0;
1056 }
1057
1058 static void ath9k_hif_usb_dev_deinit(struct hif_device_usb *hif_dev)
1059 {
1060         ath9k_hif_usb_dealloc_urbs(hif_dev);
1061 }
1062
1063 /*
1064  * If initialization fails or the FW cannot be retrieved,
1065  * detach the device.
1066  */
1067 static void ath9k_hif_usb_firmware_fail(struct hif_device_usb *hif_dev)
1068 {
1069         struct device *dev = &hif_dev->udev->dev;
1070         struct device *parent = dev->parent;
1071
1072         complete_all(&hif_dev->fw_done);
1073
1074         if (parent)
1075                 device_lock(parent);
1076
1077         device_release_driver(dev);
1078
1079         if (parent)
1080                 device_unlock(parent);
1081 }
1082
1083 static void ath9k_hif_usb_firmware_cb(const struct firmware *fw, void *context);
1084
1085 /* taken from iwlwifi */
1086 static int ath9k_hif_request_firmware(struct hif_device_usb *hif_dev,
1087                                       bool first)
1088 {
1089         char index[8], *chip;
1090         int ret;
1091
1092         if (first) {
1093                 if (htc_use_dev_fw) {
1094                         hif_dev->fw_minor_index = FIRMWARE_MINOR_IDX_MAX + 1;
1095                         sprintf(index, "%s", "dev");
1096                 } else {
1097                         hif_dev->fw_minor_index = FIRMWARE_MINOR_IDX_MAX;
1098                         sprintf(index, "%d", hif_dev->fw_minor_index);
1099                 }
1100         } else {
1101                 hif_dev->fw_minor_index--;
1102                 sprintf(index, "%d", hif_dev->fw_minor_index);
1103         }
1104
1105         /* test for FW 1.3 */
1106         if (MAJOR_VERSION_REQ == 1 && hif_dev->fw_minor_index == 3) {
1107                 const char *filename;
1108
1109                 if (IS_AR7010_DEVICE(hif_dev->usb_device_id->driver_info))
1110                         filename = FIRMWARE_AR7010_1_1;
1111                 else
1112                         filename = FIRMWARE_AR9271;
1113
1114                 /* expected fw locations:
1115                  * - htc_9271.fw   (stable version 1.3, depricated)
1116                  */
1117                 snprintf(hif_dev->fw_name, sizeof(hif_dev->fw_name),
1118                          "%s", filename);
1119
1120         } else if (hif_dev->fw_minor_index < FIRMWARE_MINOR_IDX_MIN) {
1121                 dev_err(&hif_dev->udev->dev, "no suitable firmware found!\n");
1122
1123                 return -ENOENT;
1124         } else {
1125                 if (IS_AR7010_DEVICE(hif_dev->usb_device_id->driver_info))
1126                         chip = "7010";
1127                 else
1128                         chip = "9271";
1129
1130                 /* expected fw locations:
1131                  * - ath9k_htc/htc_9271-1.dev.0.fw (development version)
1132                  * - ath9k_htc/htc_9271-1.4.0.fw   (stable version)
1133                  */
1134                 snprintf(hif_dev->fw_name, sizeof(hif_dev->fw_name),
1135                          "%s/htc_%s-%d.%s.0.fw", HTC_FW_PATH,
1136                          chip, MAJOR_VERSION_REQ, index);
1137         }
1138
1139         ret = request_firmware_nowait(THIS_MODULE, true, hif_dev->fw_name,
1140                                       &hif_dev->udev->dev, GFP_KERNEL,
1141                                       hif_dev, ath9k_hif_usb_firmware_cb);
1142         if (ret) {
1143                 dev_err(&hif_dev->udev->dev,
1144                         "ath9k_htc: Async request for firmware %s failed\n",
1145                         hif_dev->fw_name);
1146                 return ret;
1147         }
1148
1149         dev_info(&hif_dev->udev->dev, "ath9k_htc: Firmware %s requested\n",
1150                  hif_dev->fw_name);
1151
1152         return ret;
1153 }
1154
1155 static void ath9k_hif_usb_firmware_cb(const struct firmware *fw, void *context)
1156 {
1157         struct hif_device_usb *hif_dev = context;
1158         int ret;
1159
1160         if (!fw) {
1161                 ret = ath9k_hif_request_firmware(hif_dev, false);
1162                 if (!ret)
1163                         return;
1164
1165                 dev_err(&hif_dev->udev->dev,
1166                         "ath9k_htc: Failed to get firmware %s\n",
1167                         hif_dev->fw_name);
1168                 goto err_fw;
1169         }
1170
1171         hif_dev->htc_handle = ath9k_htc_hw_alloc(hif_dev, &hif_usb,
1172                                                  &hif_dev->udev->dev);
1173         if (hif_dev->htc_handle == NULL)
1174                 goto err_dev_alloc;
1175
1176         hif_dev->fw_data = fw->data;
1177         hif_dev->fw_size = fw->size;
1178
1179         /* Proceed with initialization */
1180
1181         ret = ath9k_hif_usb_dev_init(hif_dev);
1182         if (ret)
1183                 goto err_dev_init;
1184
1185         ret = ath9k_htc_hw_init(hif_dev->htc_handle,
1186                                 &hif_dev->interface->dev,
1187                                 hif_dev->usb_device_id->idProduct,
1188                                 hif_dev->udev->product,
1189                                 hif_dev->usb_device_id->driver_info);
1190         if (ret) {
1191                 ret = -EINVAL;
1192                 goto err_htc_hw_init;
1193         }
1194
1195         release_firmware(fw);
1196         hif_dev->flags |= HIF_USB_READY;
1197         complete_all(&hif_dev->fw_done);
1198
1199         return;
1200
1201 err_htc_hw_init:
1202         ath9k_hif_usb_dev_deinit(hif_dev);
1203 err_dev_init:
1204         ath9k_htc_hw_free(hif_dev->htc_handle);
1205 err_dev_alloc:
1206         release_firmware(fw);
1207 err_fw:
1208         ath9k_hif_usb_firmware_fail(hif_dev);
1209 }
1210
1211 /*
1212  * An exact copy of the function from zd1211rw.
1213  */
1214 static int send_eject_command(struct usb_interface *interface)
1215 {
1216         struct usb_device *udev = interface_to_usbdev(interface);
1217         struct usb_host_interface *iface_desc = &interface->altsetting[0];
1218         struct usb_endpoint_descriptor *endpoint;
1219         unsigned char *cmd;
1220         u8 bulk_out_ep;
1221         int r;
1222
1223         if (iface_desc->desc.bNumEndpoints < 2)
1224                 return -ENODEV;
1225
1226         /* Find bulk out endpoint */
1227         for (r = 1; r >= 0; r--) {
1228                 endpoint = &iface_desc->endpoint[r].desc;
1229                 if (usb_endpoint_dir_out(endpoint) &&
1230                     usb_endpoint_xfer_bulk(endpoint)) {
1231                         bulk_out_ep = endpoint->bEndpointAddress;
1232                         break;
1233                 }
1234         }
1235         if (r == -1) {
1236                 dev_err(&udev->dev,
1237                         "ath9k_htc: Could not find bulk out endpoint\n");
1238                 return -ENODEV;
1239         }
1240
1241         cmd = kzalloc(31, GFP_KERNEL);
1242         if (cmd == NULL)
1243                 return -ENODEV;
1244
1245         /* USB bulk command block */
1246         cmd[0] = 0x55;  /* bulk command signature */
1247         cmd[1] = 0x53;  /* bulk command signature */
1248         cmd[2] = 0x42;  /* bulk command signature */
1249         cmd[3] = 0x43;  /* bulk command signature */
1250         cmd[14] = 6;    /* command length */
1251
1252         cmd[15] = 0x1b; /* SCSI command: START STOP UNIT */
1253         cmd[19] = 0x2;  /* eject disc */
1254
1255         dev_info(&udev->dev, "Ejecting storage device...\n");
1256         r = usb_bulk_msg(udev, usb_sndbulkpipe(udev, bulk_out_ep),
1257                 cmd, 31, NULL, 2 * USB_MSG_TIMEOUT);
1258         kfree(cmd);
1259         if (r)
1260                 return r;
1261
1262         /* At this point, the device disconnects and reconnects with the real
1263          * ID numbers. */
1264
1265         usb_set_intfdata(interface, NULL);
1266         return 0;
1267 }
1268
1269 static int ath9k_hif_usb_probe(struct usb_interface *interface,
1270                                const struct usb_device_id *id)
1271 {
1272         struct usb_device *udev = interface_to_usbdev(interface);
1273         struct hif_device_usb *hif_dev;
1274         int ret = 0;
1275
1276         if (id->driver_info == STORAGE_DEVICE)
1277                 return send_eject_command(interface);
1278
1279         hif_dev = kzalloc(sizeof(struct hif_device_usb), GFP_KERNEL);
1280         if (!hif_dev) {
1281                 ret = -ENOMEM;
1282                 goto err_alloc;
1283         }
1284
1285         usb_get_dev(udev);
1286
1287         hif_dev->udev = udev;
1288         hif_dev->interface = interface;
1289         hif_dev->usb_device_id = id;
1290 #ifdef CONFIG_PM
1291         udev->reset_resume = 1;
1292 #endif
1293         usb_set_intfdata(interface, hif_dev);
1294
1295         init_completion(&hif_dev->fw_done);
1296
1297         ret = ath9k_hif_request_firmware(hif_dev, true);
1298         if (ret)
1299                 goto err_fw_req;
1300
1301         return ret;
1302
1303 err_fw_req:
1304         usb_set_intfdata(interface, NULL);
1305         kfree(hif_dev);
1306         usb_put_dev(udev);
1307 err_alloc:
1308         return ret;
1309 }
1310
1311 static void ath9k_hif_usb_reboot(struct usb_device *udev)
1312 {
1313         u32 reboot_cmd = 0xffffffff;
1314         void *buf;
1315         int ret;
1316
1317         buf = kmemdup(&reboot_cmd, 4, GFP_KERNEL);
1318         if (!buf)
1319                 return;
1320
1321         ret = usb_interrupt_msg(udev, usb_sndintpipe(udev, USB_REG_OUT_PIPE),
1322                            buf, 4, NULL, USB_MSG_TIMEOUT);
1323         if (ret)
1324                 dev_err(&udev->dev, "ath9k_htc: USB reboot failed\n");
1325
1326         kfree(buf);
1327 }
1328
1329 static void ath9k_hif_usb_disconnect(struct usb_interface *interface)
1330 {
1331         struct usb_device *udev = interface_to_usbdev(interface);
1332         struct hif_device_usb *hif_dev = usb_get_intfdata(interface);
1333         bool unplugged = (udev->state == USB_STATE_NOTATTACHED) ? true : false;
1334
1335         if (!hif_dev)
1336                 return;
1337
1338         wait_for_completion(&hif_dev->fw_done);
1339
1340         if (hif_dev->flags & HIF_USB_READY) {
1341                 ath9k_htc_hw_deinit(hif_dev->htc_handle, unplugged);
1342                 ath9k_htc_hw_free(hif_dev->htc_handle);
1343                 ath9k_hif_usb_dev_deinit(hif_dev);
1344         }
1345
1346         usb_set_intfdata(interface, NULL);
1347
1348         /* If firmware was loaded we should drop it
1349          * go back to first stage bootloader. */
1350         if (!unplugged && (hif_dev->flags & HIF_USB_READY))
1351                 ath9k_hif_usb_reboot(udev);
1352
1353         kfree(hif_dev);
1354         dev_info(&udev->dev, "ath9k_htc: USB layer deinitialized\n");
1355         usb_put_dev(udev);
1356 }
1357
1358 #ifdef CONFIG_PM
1359 static int ath9k_hif_usb_suspend(struct usb_interface *interface,
1360                                  pm_message_t message)
1361 {
1362         struct hif_device_usb *hif_dev = usb_get_intfdata(interface);
1363
1364         /*
1365          * The device has to be set to FULLSLEEP mode in case no
1366          * interface is up.
1367          */
1368         if (!(hif_dev->flags & HIF_USB_START))
1369                 ath9k_htc_suspend(hif_dev->htc_handle);
1370
1371         wait_for_completion(&hif_dev->fw_done);
1372
1373         if (hif_dev->flags & HIF_USB_READY)
1374                 ath9k_hif_usb_dealloc_urbs(hif_dev);
1375
1376         return 0;
1377 }
1378
1379 static int ath9k_hif_usb_resume(struct usb_interface *interface)
1380 {
1381         struct hif_device_usb *hif_dev = usb_get_intfdata(interface);
1382         struct htc_target *htc_handle = hif_dev->htc_handle;
1383         int ret;
1384         const struct firmware *fw;
1385
1386         ret = ath9k_hif_usb_alloc_urbs(hif_dev);
1387         if (ret)
1388                 return ret;
1389
1390         if (hif_dev->flags & HIF_USB_READY) {
1391                 /* request cached firmware during suspend/resume cycle */
1392                 ret = request_firmware(&fw, hif_dev->fw_name,
1393                                        &hif_dev->udev->dev);
1394                 if (ret)
1395                         goto fail_resume;
1396
1397                 hif_dev->fw_data = fw->data;
1398                 hif_dev->fw_size = fw->size;
1399                 ret = ath9k_hif_usb_download_fw(hif_dev);
1400                 release_firmware(fw);
1401                 if (ret)
1402                         goto fail_resume;
1403         } else {
1404                 ath9k_hif_usb_dealloc_urbs(hif_dev);
1405                 return -EIO;
1406         }
1407
1408         mdelay(100);
1409
1410         ret = ath9k_htc_resume(htc_handle);
1411
1412         if (ret)
1413                 goto fail_resume;
1414
1415         return 0;
1416
1417 fail_resume:
1418         ath9k_hif_usb_dealloc_urbs(hif_dev);
1419
1420         return ret;
1421 }
1422 #endif
1423
1424 static struct usb_driver ath9k_hif_usb_driver = {
1425         .name = KBUILD_MODNAME,
1426         .probe = ath9k_hif_usb_probe,
1427         .disconnect = ath9k_hif_usb_disconnect,
1428 #ifdef CONFIG_PM
1429         .suspend = ath9k_hif_usb_suspend,
1430         .resume = ath9k_hif_usb_resume,
1431         .reset_resume = ath9k_hif_usb_resume,
1432 #endif
1433         .id_table = ath9k_hif_usb_ids,
1434         .soft_unbind = 1,
1435         .disable_hub_initiated_lpm = 1,
1436 };
1437
1438 int ath9k_hif_usb_init(void)
1439 {
1440         return usb_register(&ath9k_hif_usb_driver);
1441 }
1442
1443 void ath9k_hif_usb_exit(void)
1444 {
1445         usb_deregister(&ath9k_hif_usb_driver);
1446 }