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