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(0x0cf3, 0xb002) }, /* Ubiquiti WifiStation */
  42         { USB_DEVICE(0x057c, 0x8403) }, /* AVM FRITZ!WLAN 11N v2 USB */
  43         { USB_DEVICE(0x0471, 0x209e) }, /* Philips (or NXP) PTA01 */
  44         { USB_DEVICE(0x1eda, 0x2315) }, /* AirTies */
  45
  46         { USB_DEVICE(0x0cf3, 0x7015),
  47           .driver_info = AR9287_USB },  /* Atheros */
  48         { USB_DEVICE(0x1668, 0x1200),
  49           .driver_info = AR9287_USB },  /* Verizon */
  50
  51         { USB_DEVICE(0x0cf3, 0x7010),
  52           .driver_info = AR9280_USB },  /* Atheros */
  53         { USB_DEVICE(0x0846, 0x9018),
  54           .driver_info = AR9280_USB },  /* Netgear WNDA3200 */
  55         { USB_DEVICE(0x083A, 0xA704),
  56           .driver_info = AR9280_USB },  /* SMC Networks */
  57         { USB_DEVICE(0x0411, 0x017f),
  58           .driver_info = AR9280_USB },  /* Sony UWA-BR100 */
  59         { USB_DEVICE(0x0411, 0x0197),
  60           .driver_info = AR9280_USB },  /* Buffalo WLI-UV-AG300P */
  61         { USB_DEVICE(0x04da, 0x3904),
  62           .driver_info = AR9280_USB },
  63         { USB_DEVICE(0x0930, 0x0a08),
  64           .driver_info = AR9280_USB },  /* Toshiba WLM-20U2 and GN-1080 */
  65
  66         { USB_DEVICE(0x0cf3, 0x20ff),
  67           .driver_info = STORAGE_DEVICE },
  68
  69         { },
  70 };
  71
  72 MODULE_DEVICE_TABLE(usb, ath9k_hif_usb_ids);
  73
  74 static int __hif_usb_tx(struct hif_device_usb *hif_dev);
  75
  76 static void hif_usb_regout_cb(struct urb *urb)
  77 {
  78         struct cmd_buf *cmd = (struct cmd_buf *)urb->context;
  79
  80         switch (urb->status) {
  81         case 0:
  82                 break;
  83         case -ENOENT:
  84         case -ECONNRESET:
  85         case -ENODEV:
  86         case -ESHUTDOWN:
  87                 goto free;
  88         default:
  89                 break;
  90         }
  91
  92         if (cmd) {
  93                 ath9k_htc_txcompletion_cb(cmd->hif_dev->htc_handle,
  94                                           cmd->skb, true);
  95                 kfree(cmd);
  96         }
  97
  98         return;
  99 free:
 100         kfree_skb(cmd->skb);
 101         kfree(cmd);
 102 }
 103
 104 static int hif_usb_send_regout(struct hif_device_usb *hif_dev,
 105                                struct sk_buff *skb)
 106 {
 107         struct urb *urb;
 108         struct cmd_buf *cmd;
 109         int ret = 0;
 110
 111         urb = usb_alloc_urb(0, GFP_KERNEL);
 112         if (urb == NULL)
 113                 return -ENOMEM;
 114
 115         cmd = kzalloc(sizeof(*cmd), GFP_KERNEL);
 116         if (cmd == NULL) {
 117                 usb_free_urb(urb);
 118                 return -ENOMEM;
 119         }
 120
 121         cmd->skb = skb;
 122         cmd->hif_dev = hif_dev;
 123
 124         usb_fill_bulk_urb(urb, hif_dev->udev,
 125                          usb_sndbulkpipe(hif_dev->udev, USB_REG_OUT_PIPE),
 126                          skb->data, skb->len,
 127                          hif_usb_regout_cb, cmd);
 128
 129         usb_anchor_urb(urb, &hif_dev->regout_submitted);
 130         ret = usb_submit_urb(urb, GFP_KERNEL);
 131         if (ret) {
 132                 usb_unanchor_urb(urb);
 133                 kfree(cmd);
 134         }
 135         usb_free_urb(urb);
 136
 137         return ret;
 138 }
 139
 140 static void hif_usb_mgmt_cb(struct urb *urb)
 141 {
 142         struct cmd_buf *cmd = (struct cmd_buf *)urb->context;
 143         struct hif_device_usb *hif_dev;
 144         bool txok = true;
 145
 146         if (!cmd || !cmd->skb || !cmd->hif_dev)
 147                 return;
 148
 149         hif_dev = cmd->hif_dev;
 150
 151         switch (urb->status) {
 152         case 0:
 153                 break;
 154         case -ENOENT:
 155         case -ECONNRESET:
 156         case -ENODEV:
 157         case -ESHUTDOWN:
 158                 txok = false;
 159
 160                 /*
 161                  * If the URBs are being flushed, no need to complete
 162                  * this packet.
 163                  */
 164                 spin_lock(&hif_dev->tx.tx_lock);
 165                 if (hif_dev->tx.flags & HIF_USB_TX_FLUSH) {
 166                         spin_unlock(&hif_dev->tx.tx_lock);
 167                         dev_kfree_skb_any(cmd->skb);
 168                         kfree(cmd);
 169                         return;
 170                 }
 171                 spin_unlock(&hif_dev->tx.tx_lock);
 172
 173                 break;
 174         default:
 175                 txok = false;
 176                 break;
 177         }
 178
 179         skb_pull(cmd->skb, 4);
 180         ath9k_htc_txcompletion_cb(cmd->hif_dev->htc_handle,
 181                                   cmd->skb, txok);
 182         kfree(cmd);
 183 }
 184
 185 static int hif_usb_send_mgmt(struct hif_device_usb *hif_dev,
 186                              struct sk_buff *skb)
 187 {
 188         struct urb *urb;
 189         struct cmd_buf *cmd;
 190         int ret = 0;
 191         __le16 *hdr;
 192
 193         urb = usb_alloc_urb(0, GFP_ATOMIC);
 194         if (urb == NULL)
 195                 return -ENOMEM;
 196
 197         cmd = kzalloc(sizeof(*cmd), GFP_ATOMIC);
 198         if (cmd == NULL) {
 199                 usb_free_urb(urb);
 200                 return -ENOMEM;
 201         }
 202
 203         cmd->skb = skb;
 204         cmd->hif_dev = hif_dev;
 205
 206         hdr = (__le16 *) skb_push(skb, 4);
 207         *hdr++ = cpu_to_le16(skb->len - 4);
 208         *hdr++ = cpu_to_le16(ATH_USB_TX_STREAM_MODE_TAG);
 209
 210         usb_fill_bulk_urb(urb, hif_dev->udev,
 211                          usb_sndbulkpipe(hif_dev->udev, USB_WLAN_TX_PIPE),
 212                          skb->data, skb->len,
 213                          hif_usb_mgmt_cb, cmd);
 214
 215         usb_anchor_urb(urb, &hif_dev->mgmt_submitted);
 216         ret = usb_submit_urb(urb, GFP_ATOMIC);
 217         if (ret) {
 218                 usb_unanchor_urb(urb);
 219                 kfree(cmd);
 220         }
 221         usb_free_urb(urb);
 222
 223         return ret;
 224 }
 225
 226 static inline void ath9k_skb_queue_purge(struct hif_device_usb *hif_dev,
 227                                          struct sk_buff_head *list)
 228 {
 229         struct sk_buff *skb;
 230
 231         while ((skb = __skb_dequeue(list)) != NULL) {
 232                 dev_kfree_skb_any(skb);
 233         }
 234 }
 235
 236 static inline void ath9k_skb_queue_complete(struct hif_device_usb *hif_dev,
 237                                             struct sk_buff_head *queue,
 238                                             bool txok)
 239 {
 240         struct sk_buff *skb;
 241
 242         while ((skb = __skb_dequeue(queue)) != NULL) {
 243                 ath9k_htc_txcompletion_cb(hif_dev->htc_handle,
 244                                           skb, txok);
 245                 if (txok)
 246                         TX_STAT_INC(skb_success);
 247                 else
 248                         TX_STAT_INC(skb_failed);
 249         }
 250 }
 251
 252 static void hif_usb_tx_cb(struct urb *urb)
 253 {
 254         struct tx_buf *tx_buf = (struct tx_buf *) urb->context;
 255         struct hif_device_usb *hif_dev;
 256         bool txok = true;
 257
 258         if (!tx_buf || !tx_buf->hif_dev)
 259                 return;
 260
 261         hif_dev = tx_buf->hif_dev;
 262
 263         switch (urb->status) {
 264         case 0:
 265                 break;
 266         case -ENOENT:
 267         case -ECONNRESET:
 268         case -ENODEV:
 269         case -ESHUTDOWN:
 270                 txok = false;
 271
 272                 /*
 273                  * If the URBs are being flushed, no need to add this
 274                  * URB to the free list.
 275                  */
 276                 spin_lock(&hif_dev->tx.tx_lock);
 277                 if (hif_dev->tx.flags & HIF_USB_TX_FLUSH) {
 278                         spin_unlock(&hif_dev->tx.tx_lock);
 279                         ath9k_skb_queue_purge(hif_dev, &tx_buf->skb_queue);
 280                         return;
 281                 }
 282                 spin_unlock(&hif_dev->tx.tx_lock);
 283
 284                 break;
 285         default:
 286                 txok = false;
 287                 break;
 288         }
 289
 290         ath9k_skb_queue_complete(hif_dev, &tx_buf->skb_queue, txok);
 291
 292         /* Re-initialize the SKB queue */
 293         tx_buf->len = tx_buf->offset = 0;
 294         __skb_queue_head_init(&tx_buf->skb_queue);
 295
 296         /* Add this TX buffer to the free list */
 297         spin_lock(&hif_dev->tx.tx_lock);
 298         list_move_tail(&tx_buf->list, &hif_dev->tx.tx_buf);
 299         hif_dev->tx.tx_buf_cnt++;
 300         if (!(hif_dev->tx.flags & HIF_USB_TX_STOP))
 301                 __hif_usb_tx(hif_dev); /* Check for pending SKBs */
 302         TX_STAT_INC(buf_completed);
 303         spin_unlock(&hif_dev->tx.tx_lock);
 304 }
 305
 306 /* TX lock has to be taken */
 307 static int __hif_usb_tx(struct hif_device_usb *hif_dev)
 308 {
 309         struct tx_buf *tx_buf = NULL;
 310         struct sk_buff *nskb = NULL;
 311         int ret = 0, i;
 312         u16 tx_skb_cnt = 0;
 313         u8 *buf;
 314         __le16 *hdr;
 315
 316         if (hif_dev->tx.tx_skb_cnt == 0)
 317                 return 0;
 318
 319         /* Check if a free TX buffer is available */
 320         if (list_empty(&hif_dev->tx.tx_buf))
 321                 return 0;
 322
 323         tx_buf = list_first_entry(&hif_dev->tx.tx_buf, struct tx_buf, list);
 324         list_move_tail(&tx_buf->list, &hif_dev->tx.tx_pending);
 325         hif_dev->tx.tx_buf_cnt--;
 326
 327         tx_skb_cnt = min_t(u16, hif_dev->tx.tx_skb_cnt, MAX_TX_AGGR_NUM);
 328
 329         for (i = 0; i < tx_skb_cnt; i++) {
 330                 nskb = __skb_dequeue(&hif_dev->tx.tx_skb_queue);
 331
 332                 /* Should never be NULL */
 333                 BUG_ON(!nskb);
 334
 335                 hif_dev->tx.tx_skb_cnt--;
 336
 337                 buf = tx_buf->buf;
 338                 buf += tx_buf->offset;
 339                 hdr = (__le16 *)buf;
 340                 *hdr++ = cpu_to_le16(nskb->len);
 341                 *hdr++ = cpu_to_le16(ATH_USB_TX_STREAM_MODE_TAG);
 342                 buf += 4;
 343                 memcpy(buf, nskb->data, nskb->len);
 344                 tx_buf->len = nskb->len + 4;
 345
 346                 if (i < (tx_skb_cnt - 1))
 347                         tx_buf->offset += (((tx_buf->len - 1) / 4) + 1) * 4;
 348
 349                 if (i == (tx_skb_cnt - 1))
 350                         tx_buf->len += tx_buf->offset;
 351
 352                 __skb_queue_tail(&tx_buf->skb_queue, nskb);
 353                 TX_STAT_INC(skb_queued);
 354         }
 355
 356         usb_fill_bulk_urb(tx_buf->urb, hif_dev->udev,
 357                           usb_sndbulkpipe(hif_dev->udev, USB_WLAN_TX_PIPE),
 358                           tx_buf->buf, tx_buf->len,
 359                           hif_usb_tx_cb, tx_buf);
 360
 361         ret = usb_submit_urb(tx_buf->urb, GFP_ATOMIC);
 362         if (ret) {
 363                 tx_buf->len = tx_buf->offset = 0;
 364                 ath9k_skb_queue_complete(hif_dev, &tx_buf->skb_queue, false);
 365                 __skb_queue_head_init(&tx_buf->skb_queue);
 366                 list_move_tail(&tx_buf->list, &hif_dev->tx.tx_buf);
 367                 hif_dev->tx.tx_buf_cnt++;
 368         }
 369
 370         if (!ret)
 371                 TX_STAT_INC(buf_queued);
 372
 373         return ret;
 374 }
 375
 376 static int hif_usb_send_tx(struct hif_device_usb *hif_dev, struct sk_buff *skb)
 377 {
 378         struct ath9k_htc_tx_ctl *tx_ctl;
 379         unsigned long flags;
 380         int ret = 0;
 381
 382         spin_lock_irqsave(&hif_dev->tx.tx_lock, flags);
 383
 384         if (hif_dev->tx.flags & HIF_USB_TX_STOP) {
 385                 spin_unlock_irqrestore(&hif_dev->tx.tx_lock, flags);
 386                 return -ENODEV;
 387         }
 388
 389         /* Check if the max queue count has been reached */
 390         if (hif_dev->tx.tx_skb_cnt > MAX_TX_BUF_NUM) {
 391                 spin_unlock_irqrestore(&hif_dev->tx.tx_lock, flags);
 392                 return -ENOMEM;
 393         }
 394
 395         spin_unlock_irqrestore(&hif_dev->tx.tx_lock, flags);
 396
 397         tx_ctl = HTC_SKB_CB(skb);
 398
 399         /* Mgmt/Beacon frames don't use the TX buffer pool */
 400         if ((tx_ctl->type == ATH9K_HTC_MGMT) ||
 401             (tx_ctl->type == ATH9K_HTC_BEACON)) {
 402                 ret = hif_usb_send_mgmt(hif_dev, skb);
 403         }
 404
 405         spin_lock_irqsave(&hif_dev->tx.tx_lock, flags);
 406
 407         if ((tx_ctl->type == ATH9K_HTC_NORMAL) ||
 408             (tx_ctl->type == ATH9K_HTC_AMPDU)) {
 409                 __skb_queue_tail(&hif_dev->tx.tx_skb_queue, skb);
 410                 hif_dev->tx.tx_skb_cnt++;
 411         }
 412
 413         /* Check if AMPDUs have to be sent immediately */
 414         if ((hif_dev->tx.tx_buf_cnt == MAX_TX_URB_NUM) &&
 415             (hif_dev->tx.tx_skb_cnt < 2)) {
 416                 __hif_usb_tx(hif_dev);
 417         }
 418
 419         spin_unlock_irqrestore(&hif_dev->tx.tx_lock, flags);
 420
 421         return ret;
 422 }
 423
 424 static void hif_usb_start(void *hif_handle)
 425 {
 426         struct hif_device_usb *hif_dev = (struct hif_device_usb *)hif_handle;
 427         unsigned long flags;
 428
 429         hif_dev->flags |= HIF_USB_START;
 430
 431         spin_lock_irqsave(&hif_dev->tx.tx_lock, flags);
 432         hif_dev->tx.flags &= ~HIF_USB_TX_STOP;
 433         spin_unlock_irqrestore(&hif_dev->tx.tx_lock, flags);
 434 }
 435
 436 static void hif_usb_stop(void *hif_handle)
 437 {
 438         struct hif_device_usb *hif_dev = (struct hif_device_usb *)hif_handle;
 439         struct tx_buf *tx_buf = NULL, *tx_buf_tmp = NULL;
 440         unsigned long flags;
 441
 442         spin_lock_irqsave(&hif_dev->tx.tx_lock, flags);
 443         ath9k_skb_queue_complete(hif_dev, &hif_dev->tx.tx_skb_queue, false);
 444         hif_dev->tx.tx_skb_cnt = 0;
 445         hif_dev->tx.flags |= HIF_USB_TX_STOP;
 446         spin_unlock_irqrestore(&hif_dev->tx.tx_lock, flags);
 447
 448         /* The pending URBs have to be canceled. */
 449         list_for_each_entry_safe(tx_buf, tx_buf_tmp,
 450                                  &hif_dev->tx.tx_pending, list) {
 451                 usb_kill_urb(tx_buf->urb);
 452         }
 453
 454         usb_kill_anchored_urbs(&hif_dev->mgmt_submitted);
 455 }
 456
 457 static int hif_usb_send(void *hif_handle, u8 pipe_id, struct sk_buff *skb)
 458 {
 459         struct hif_device_usb *hif_dev = (struct hif_device_usb *)hif_handle;
 460         int ret = 0;
 461
 462         switch (pipe_id) {
 463         case USB_WLAN_TX_PIPE:
 464                 ret = hif_usb_send_tx(hif_dev, skb);
 465                 break;
 466         case USB_REG_OUT_PIPE:
 467                 ret = hif_usb_send_regout(hif_dev, skb);
 468                 break;
 469         default:
 470                 dev_err(&hif_dev->udev->dev,
 471                         "ath9k_htc: Invalid TX pipe: %d\n", pipe_id);
 472                 ret = -EINVAL;
 473                 break;
 474         }
 475
 476         return ret;
 477 }
 478
 479 static inline bool check_index(struct sk_buff *skb, u8 idx)
 480 {
 481         struct ath9k_htc_tx_ctl *tx_ctl;
 482
 483         tx_ctl = HTC_SKB_CB(skb);
 484
 485         if ((tx_ctl->type == ATH9K_HTC_AMPDU) &&
 486             (tx_ctl->sta_idx == idx))
 487                 return true;
 488
 489         return false;
 490 }
 491
 492 static void hif_usb_sta_drain(void *hif_handle, u8 idx)
 493 {
 494         struct hif_device_usb *hif_dev = (struct hif_device_usb *)hif_handle;
 495         struct sk_buff *skb, *tmp;
 496         unsigned long flags;
 497
 498         spin_lock_irqsave(&hif_dev->tx.tx_lock, flags);
 499
 500         skb_queue_walk_safe(&hif_dev->tx.tx_skb_queue, skb, tmp) {
 501                 if (check_index(skb, idx)) {
 502                         __skb_unlink(skb, &hif_dev->tx.tx_skb_queue);
 503                         ath9k_htc_txcompletion_cb(hif_dev->htc_handle,
 504                                                   skb, false);
 505                         hif_dev->tx.tx_skb_cnt--;
 506                         TX_STAT_INC(skb_failed);
 507                 }
 508         }
 509
 510         spin_unlock_irqrestore(&hif_dev->tx.tx_lock, flags);
 511 }
 512
 513 static struct ath9k_htc_hif hif_usb = {
 514         .transport = ATH9K_HIF_USB,
 515         .name = "ath9k_hif_usb",
 516
 517         .control_ul_pipe = USB_REG_OUT_PIPE,
 518         .control_dl_pipe = USB_REG_IN_PIPE,
 519
 520         .start = hif_usb_start,
 521         .stop = hif_usb_stop,
 522         .sta_drain = hif_usb_sta_drain,
 523         .send = hif_usb_send,
 524 };
 525
 526 static void ath9k_hif_usb_rx_stream(struct hif_device_usb *hif_dev,
 527                                     struct sk_buff *skb)
 528 {
 529         struct sk_buff *nskb, *skb_pool[MAX_PKT_NUM_IN_TRANSFER];
 530         int index = 0, i = 0, len = skb->len;
 531         int rx_remain_len, rx_pkt_len;
 532         u16 pool_index = 0;
 533         u8 *ptr;
 534
 535         spin_lock(&hif_dev->rx_lock);
 536
 537         rx_remain_len = hif_dev->rx_remain_len;
 538         rx_pkt_len = hif_dev->rx_transfer_len;
 539
 540         if (rx_remain_len != 0) {
 541                 struct sk_buff *remain_skb = hif_dev->remain_skb;
 542
 543                 if (remain_skb) {
 544                         ptr = (u8 *) remain_skb->data;
 545
 546                         index = rx_remain_len;
 547                         rx_remain_len -= hif_dev->rx_pad_len;
 548                         ptr += rx_pkt_len;
 549
 550                         memcpy(ptr, skb->data, rx_remain_len);
 551
 552                         rx_pkt_len += rx_remain_len;
 553                         hif_dev->rx_remain_len = 0;
 554                         skb_put(remain_skb, rx_pkt_len);
 555
 556                         skb_pool[pool_index++] = remain_skb;
 557
 558                 } else {
 559                         index = rx_remain_len;
 560                 }
 561         }
 562
 563         spin_unlock(&hif_dev->rx_lock);
 564
 565         while (index < len) {
 566                 u16 pkt_len;
 567                 u16 pkt_tag;
 568                 u16 pad_len;
 569                 int chk_idx;
 570
 571                 ptr = (u8 *) skb->data;
 572
 573                 pkt_len = get_unaligned_le16(ptr + index);
 574                 pkt_tag = get_unaligned_le16(ptr + index + 2);
 575
 576                 if (pkt_tag != ATH_USB_RX_STREAM_MODE_TAG) {
 577                         RX_STAT_INC(skb_dropped);
 578                         return;
 579                 }
 580
 581                 pad_len = 4 - (pkt_len & 0x3);
 582                 if (pad_len == 4)
 583                         pad_len = 0;
 584
 585                 chk_idx = index;
 586                 index = index + 4 + pkt_len + pad_len;
 587
 588                 if (index > MAX_RX_BUF_SIZE) {
 589                         spin_lock(&hif_dev->rx_lock);
 590                         hif_dev->rx_remain_len = index - MAX_RX_BUF_SIZE;
 591                         hif_dev->rx_transfer_len =
 592                                 MAX_RX_BUF_SIZE - chk_idx - 4;
 593                         hif_dev->rx_pad_len = pad_len;
 594
 595                         nskb = __dev_alloc_skb(pkt_len + 32, GFP_ATOMIC);
 596                         if (!nskb) {
 597                                 dev_err(&hif_dev->udev->dev,
 598                                         "ath9k_htc: RX memory allocation error\n");
 599                                 spin_unlock(&hif_dev->rx_lock);
 600                                 goto err;
 601                         }
 602                         skb_reserve(nskb, 32);
 603                         RX_STAT_INC(skb_allocated);
 604
 605                         memcpy(nskb->data, &(skb->data[chk_idx+4]),
 606                                hif_dev->rx_transfer_len);
 607
 608                         /* Record the buffer pointer */
 609                         hif_dev->remain_skb = nskb;
 610                         spin_unlock(&hif_dev->rx_lock);
 611                 } else {
 612                         nskb = __dev_alloc_skb(pkt_len + 32, GFP_ATOMIC);
 613                         if (!nskb) {
 614                                 dev_err(&hif_dev->udev->dev,
 615                                         "ath9k_htc: RX memory allocation error\n");
 616                                 goto err;
 617                         }
 618                         skb_reserve(nskb, 32);
 619                         RX_STAT_INC(skb_allocated);
 620
 621                         memcpy(nskb->data, &(skb->data[chk_idx+4]), pkt_len);
 622                         skb_put(nskb, pkt_len);
 623                         skb_pool[pool_index++] = nskb;
 624                 }
 625         }
 626
 627 err:
 628         for (i = 0; i < pool_index; i++) {
 629                 ath9k_htc_rx_msg(hif_dev->htc_handle, skb_pool[i],
 630                                  skb_pool[i]->len, USB_WLAN_RX_PIPE);
 631                 RX_STAT_INC(skb_completed);
 632         }
 633 }
 634
 635 static void ath9k_hif_usb_rx_cb(struct urb *urb)
 636 {
 637         struct sk_buff *skb = (struct sk_buff *) urb->context;
 638         struct hif_device_usb *hif_dev =
 639                 usb_get_intfdata(usb_ifnum_to_if(urb->dev, 0));
 640         int ret;
 641
 642         if (!skb)
 643                 return;
 644
 645         if (!hif_dev)
 646                 goto free;
 647
 648         switch (urb->status) {
 649         case 0:
 650                 break;
 651         case -ENOENT:
 652         case -ECONNRESET:
 653         case -ENODEV:
 654         case -ESHUTDOWN:
 655                 goto free;
 656         default:
 657                 goto resubmit;
 658         }
 659
 660         if (likely(urb->actual_length != 0)) {
 661                 skb_put(skb, urb->actual_length);
 662                 ath9k_hif_usb_rx_stream(hif_dev, skb);
 663         }
 664
 665 resubmit:
 666         skb_reset_tail_pointer(skb);
 667         skb_trim(skb, 0);
 668
 669         usb_anchor_urb(urb, &hif_dev->rx_submitted);
 670         ret = usb_submit_urb(urb, GFP_ATOMIC);
 671         if (ret) {
 672                 usb_unanchor_urb(urb);
 673                 goto free;
 674         }
 675
 676         return;
 677 free:
 678         kfree_skb(skb);
 679 }
 680
 681 static void ath9k_hif_usb_reg_in_cb(struct urb *urb)
 682 {
 683         struct sk_buff *skb = (struct sk_buff *) urb->context;
 684         struct sk_buff *nskb;
 685         struct hif_device_usb *hif_dev =
 686                 usb_get_intfdata(usb_ifnum_to_if(urb->dev, 0));
 687         int ret;
 688
 689         if (!skb)
 690                 return;
 691
 692         if (!hif_dev)
 693                 goto free;
 694
 695         switch (urb->status) {
 696         case 0:
 697                 break;
 698         case -ENOENT:
 699         case -ECONNRESET:
 700         case -ENODEV:
 701         case -ESHUTDOWN:
 702                 goto free;
 703         default:
 704                 skb_reset_tail_pointer(skb);
 705                 skb_trim(skb, 0);
 706
 707                 goto resubmit;
 708         }
 709
 710         if (likely(urb->actual_length != 0)) {
 711                 skb_put(skb, urb->actual_length);
 712
 713                 /* Process the command first */
 714                 ath9k_htc_rx_msg(hif_dev->htc_handle, skb,
 715                                  skb->len, USB_REG_IN_PIPE);
 716
 717
 718                 nskb = alloc_skb(MAX_REG_IN_BUF_SIZE, GFP_ATOMIC);
 719                 if (!nskb) {
 720                         dev_err(&hif_dev->udev->dev,
 721                                 "ath9k_htc: REG_IN memory allocation failure\n");
 722                         urb->context = NULL;
 723                         return;
 724                 }
 725
 726                 usb_fill_bulk_urb(urb, hif_dev->udev,
 727                                  usb_rcvbulkpipe(hif_dev->udev,
 728                                                  USB_REG_IN_PIPE),
 729                                  nskb->data, MAX_REG_IN_BUF_SIZE,
 730                                  ath9k_hif_usb_reg_in_cb, nskb);
 731         }
 732
 733 resubmit:
 734         usb_anchor_urb(urb, &hif_dev->reg_in_submitted);
 735         ret = usb_submit_urb(urb, GFP_ATOMIC);
 736         if (ret) {
 737                 usb_unanchor_urb(urb);
 738                 goto free;
 739         }
 740
 741         return;
 742 free:
 743         kfree_skb(skb);
 744         urb->context = NULL;
 745 }
 746
 747 static void ath9k_hif_usb_dealloc_tx_urbs(struct hif_device_usb *hif_dev)
 748 {
 749         struct tx_buf *tx_buf = NULL, *tx_buf_tmp = NULL;
 750         unsigned long flags;
 751
 752         list_for_each_entry_safe(tx_buf, tx_buf_tmp,
 753                                  &hif_dev->tx.tx_buf, list) {
 754                 usb_kill_urb(tx_buf->urb);
 755                 list_del(&tx_buf->list);
 756                 usb_free_urb(tx_buf->urb);
 757                 kfree(tx_buf->buf);
 758                 kfree(tx_buf);
 759         }
 760
 761         spin_lock_irqsave(&hif_dev->tx.tx_lock, flags);
 762         hif_dev->tx.flags |= HIF_USB_TX_FLUSH;
 763         spin_unlock_irqrestore(&hif_dev->tx.tx_lock, flags);
 764
 765         list_for_each_entry_safe(tx_buf, tx_buf_tmp,
 766                                  &hif_dev->tx.tx_pending, list) {
 767                 usb_kill_urb(tx_buf->urb);
 768                 list_del(&tx_buf->list);
 769                 usb_free_urb(tx_buf->urb);
 770                 kfree(tx_buf->buf);
 771                 kfree(tx_buf);
 772         }
 773
 774         usb_kill_anchored_urbs(&hif_dev->mgmt_submitted);
 775 }
 776
 777 static int ath9k_hif_usb_alloc_tx_urbs(struct hif_device_usb *hif_dev)
 778 {
 779         struct tx_buf *tx_buf;
 780         int i;
 781
 782         INIT_LIST_HEAD(&hif_dev->tx.tx_buf);
 783         INIT_LIST_HEAD(&hif_dev->tx.tx_pending);
 784         spin_lock_init(&hif_dev->tx.tx_lock);
 785         __skb_queue_head_init(&hif_dev->tx.tx_skb_queue);
 786         init_usb_anchor(&hif_dev->mgmt_submitted);
 787
 788         for (i = 0; i < MAX_TX_URB_NUM; i++) {
 789                 tx_buf = kzalloc(sizeof(struct tx_buf), GFP_KERNEL);
 790                 if (!tx_buf)
 791                         goto err;
 792
 793                 tx_buf->buf = kzalloc(MAX_TX_BUF_SIZE, GFP_KERNEL);
 794                 if (!tx_buf->buf)
 795                         goto err;
 796
 797                 tx_buf->urb = usb_alloc_urb(0, GFP_KERNEL);
 798                 if (!tx_buf->urb)
 799                         goto err;
 800
 801                 tx_buf->hif_dev = hif_dev;
 802                 __skb_queue_head_init(&tx_buf->skb_queue);
 803
 804                 list_add_tail(&tx_buf->list, &hif_dev->tx.tx_buf);
 805         }
 806
 807         hif_dev->tx.tx_buf_cnt = MAX_TX_URB_NUM;
 808
 809         return 0;
 810 err:
 811         if (tx_buf) {
 812                 kfree(tx_buf->buf);
 813                 kfree(tx_buf);
 814         }
 815         ath9k_hif_usb_dealloc_tx_urbs(hif_dev);
 816         return -ENOMEM;
 817 }
 818
 819 static void ath9k_hif_usb_dealloc_rx_urbs(struct hif_device_usb *hif_dev)
 820 {
 821         usb_kill_anchored_urbs(&hif_dev->rx_submitted);
 822 }
 823
 824 static int ath9k_hif_usb_alloc_rx_urbs(struct hif_device_usb *hif_dev)
 825 {
 826         struct urb *urb = NULL;
 827         struct sk_buff *skb = NULL;
 828         int i, ret;
 829
 830         init_usb_anchor(&hif_dev->rx_submitted);
 831         spin_lock_init(&hif_dev->rx_lock);
 832
 833         for (i = 0; i < MAX_RX_URB_NUM; i++) {
 834
 835                 /* Allocate URB */
 836                 urb = usb_alloc_urb(0, GFP_KERNEL);
 837                 if (urb == NULL) {
 838                         ret = -ENOMEM;
 839                         goto err_urb;
 840                 }
 841
 842                 /* Allocate buffer */
 843                 skb = alloc_skb(MAX_RX_BUF_SIZE, GFP_KERNEL);
 844                 if (!skb) {
 845                         ret = -ENOMEM;
 846                         goto err_skb;
 847                 }
 848
 849                 usb_fill_bulk_urb(urb, hif_dev->udev,
 850                                   usb_rcvbulkpipe(hif_dev->udev,
 851                                                   USB_WLAN_RX_PIPE),
 852                                   skb->data, MAX_RX_BUF_SIZE,
 853                                   ath9k_hif_usb_rx_cb, skb);
 854
 855                 /* Anchor URB */
 856                 usb_anchor_urb(urb, &hif_dev->rx_submitted);
 857
 858                 /* Submit URB */
 859                 ret = usb_submit_urb(urb, GFP_KERNEL);
 860                 if (ret) {
 861                         usb_unanchor_urb(urb);
 862                         goto err_submit;
 863                 }
 864
 865                 /*
 866                  * Drop reference count.
 867                  * This ensures that the URB is freed when killing them.
 868                  */
 869                 usb_free_urb(urb);
 870         }
 871
 872         return 0;
 873
 874 err_submit:
 875         kfree_skb(skb);
 876 err_skb:
 877         usb_free_urb(urb);
 878 err_urb:
 879         ath9k_hif_usb_dealloc_rx_urbs(hif_dev);
 880         return ret;
 881 }
 882
 883 static void ath9k_hif_usb_dealloc_reg_in_urbs(struct hif_device_usb *hif_dev)
 884 {
 885         usb_kill_anchored_urbs(&hif_dev->reg_in_submitted);
 886 }
 887
 888 static int ath9k_hif_usb_alloc_reg_in_urbs(struct hif_device_usb *hif_dev)
 889 {
 890         struct urb *urb = NULL;
 891         struct sk_buff *skb = NULL;
 892         int i, ret;
 893
 894         init_usb_anchor(&hif_dev->reg_in_submitted);
 895
 896         for (i = 0; i < MAX_REG_IN_URB_NUM; i++) {
 897
 898                 /* Allocate URB */
 899                 urb = usb_alloc_urb(0, GFP_KERNEL);
 900                 if (urb == NULL) {
 901                         ret = -ENOMEM;
 902                         goto err_urb;
 903                 }
 904
 905                 /* Allocate buffer */
 906                 skb = alloc_skb(MAX_REG_IN_BUF_SIZE, GFP_KERNEL);
 907                 if (!skb) {
 908                         ret = -ENOMEM;
 909                         goto err_skb;
 910                 }
 911
 912                 usb_fill_bulk_urb(urb, hif_dev->udev,
 913                                   usb_rcvbulkpipe(hif_dev->udev,
 914                                                   USB_REG_IN_PIPE),
 915                                   skb->data, MAX_REG_IN_BUF_SIZE,
 916                                   ath9k_hif_usb_reg_in_cb, skb);
 917
 918                 /* Anchor URB */
 919                 usb_anchor_urb(urb, &hif_dev->reg_in_submitted);
 920
 921                 /* Submit URB */
 922                 ret = usb_submit_urb(urb, GFP_KERNEL);
 923                 if (ret) {
 924                         usb_unanchor_urb(urb);
 925                         goto err_submit;
 926                 }
 927
 928                 /*
 929                  * Drop reference count.
 930                  * This ensures that the URB is freed when killing them.
 931                  */
 932                 usb_free_urb(urb);
 933         }
 934
 935         return 0;
 936
 937 err_submit:
 938         kfree_skb(skb);
 939 err_skb:
 940         usb_free_urb(urb);
 941 err_urb:
 942         ath9k_hif_usb_dealloc_reg_in_urbs(hif_dev);
 943         return ret;
 944 }
 945
 946 static int ath9k_hif_usb_alloc_urbs(struct hif_device_usb *hif_dev)
 947 {
 948         /* Register Write */
 949         init_usb_anchor(&hif_dev->regout_submitted);
 950
 951         /* TX */
 952         if (ath9k_hif_usb_alloc_tx_urbs(hif_dev) < 0)
 953                 goto err;
 954
 955         /* RX */
 956         if (ath9k_hif_usb_alloc_rx_urbs(hif_dev) < 0)
 957                 goto err_rx;
 958
 959         /* Register Read */
 960         if (ath9k_hif_usb_alloc_reg_in_urbs(hif_dev) < 0)
 961                 goto err_reg;
 962
 963         return 0;
 964 err_reg:
 965         ath9k_hif_usb_dealloc_rx_urbs(hif_dev);
 966 err_rx:
 967         ath9k_hif_usb_dealloc_tx_urbs(hif_dev);
 968 err:
 969         return -ENOMEM;
 970 }
 971
 972 static void ath9k_hif_usb_dealloc_urbs(struct hif_device_usb *hif_dev)
 973 {
 974         usb_kill_anchored_urbs(&hif_dev->regout_submitted);
 975         ath9k_hif_usb_dealloc_reg_in_urbs(hif_dev);
 976         ath9k_hif_usb_dealloc_tx_urbs(hif_dev);
 977         ath9k_hif_usb_dealloc_rx_urbs(hif_dev);
 978 }
 979
 980 static int ath9k_hif_usb_download_fw(struct hif_device_usb *hif_dev,
 981                                      u32 drv_info)
 982 {
 983         int transfer, err;
 984         const void *data = hif_dev->firmware->data;
 985         size_t len = hif_dev->firmware->size;
 986         u32 addr = AR9271_FIRMWARE;
 987         u8 *buf = kzalloc(4096, GFP_KERNEL);
 988         u32 firm_offset;
 989
 990         if (!buf)
 991                 return -ENOMEM;
 992
 993         while (len) {
 994                 transfer = min_t(int, len, 4096);
 995                 memcpy(buf, data, transfer);
 996
 997                 err = usb_control_msg(hif_dev->udev,
 998                                       usb_sndctrlpipe(hif_dev->udev, 0),
 999                                       FIRMWARE_DOWNLOAD, 0x40 | USB_DIR_OUT,
1000                                       addr >> 8, 0, buf, transfer, HZ);
1001                 if (err < 0) {
1002                         kfree(buf);
1003                         return err;
1004                 }
1005
1006                 len -= transfer;
1007                 data += transfer;
1008                 addr += transfer;
1009         }
1010         kfree(buf);
1011
1012         if (IS_AR7010_DEVICE(drv_info))
1013                 firm_offset = AR7010_FIRMWARE_TEXT;
1014         else
1015                 firm_offset = AR9271_FIRMWARE_TEXT;
1016
1017         /*
1018          * Issue FW download complete command to firmware.
1019          */
1020         err = usb_control_msg(hif_dev->udev, usb_sndctrlpipe(hif_dev->udev, 0),
1021                               FIRMWARE_DOWNLOAD_COMP,
1022                               0x40 | USB_DIR_OUT,
1023                               firm_offset >> 8, 0, NULL, 0, HZ);
1024         if (err)
1025                 return -EIO;
1026
1027         dev_info(&hif_dev->udev->dev, "ath9k_htc: Transferred FW: %s, size: %ld\n",
1028                  hif_dev->fw_name, (unsigned long) hif_dev->firmware->size);
1029
1030         return 0;
1031 }
1032
1033 static int ath9k_hif_usb_dev_init(struct hif_device_usb *hif_dev, u32 drv_info)
1034 {
1035         int ret, idx;
1036         struct usb_host_interface *alt = &hif_dev->interface->altsetting[0];
1037         struct usb_endpoint_descriptor *endp;
1038
1039         /* Request firmware */
1040         ret = request_firmware(&hif_dev->firmware, hif_dev->fw_name,
1041                                &hif_dev->udev->dev);
1042         if (ret) {
1043                 dev_err(&hif_dev->udev->dev,
1044                         "ath9k_htc: Firmware - %s not found\n", hif_dev->fw_name);
1045                 goto err_fw_req;
1046         }
1047
1048         /* Download firmware */
1049         ret = ath9k_hif_usb_download_fw(hif_dev, drv_info);
1050         if (ret) {
1051                 dev_err(&hif_dev->udev->dev,
1052                         "ath9k_htc: Firmware - %s download failed\n",
1053                         hif_dev->fw_name);
1054                 goto err_fw_download;
1055         }
1056
1057         /* On downloading the firmware to the target, the USB descriptor of EP4
1058          * is 'patched' to change the type of the endpoint to Bulk. This will
1059          * bring down CPU usage during the scan period.
1060          */
1061         for (idx = 0; idx < alt->desc.bNumEndpoints; idx++) {
1062                 endp = &alt->endpoint[idx].desc;
1063                 if ((endp->bmAttributes & USB_ENDPOINT_XFERTYPE_MASK)
1064                                 == USB_ENDPOINT_XFER_INT) {
1065                         endp->bmAttributes &= ~USB_ENDPOINT_XFERTYPE_MASK;
1066                         endp->bmAttributes |= USB_ENDPOINT_XFER_BULK;
1067                         endp->bInterval = 0;
1068                 }
1069         }
1070
1071         /* Alloc URBs */
1072         ret = ath9k_hif_usb_alloc_urbs(hif_dev);
1073         if (ret) {
1074                 dev_err(&hif_dev->udev->dev,
1075                         "ath9k_htc: Unable to allocate URBs\n");
1076                 goto err_fw_download;
1077         }
1078
1079         return 0;
1080
1081 err_fw_download:
1082         release_firmware(hif_dev->firmware);
1083 err_fw_req:
1084         hif_dev->firmware = NULL;
1085         return ret;
1086 }
1087
1088 static void ath9k_hif_usb_dev_deinit(struct hif_device_usb *hif_dev)
1089 {
1090         ath9k_hif_usb_dealloc_urbs(hif_dev);
1091         if (hif_dev->firmware)
1092                 release_firmware(hif_dev->firmware);
1093 }
1094
1095 /*
1096  * An exact copy of the function from zd1211rw.
1097  */
1098 static int send_eject_command(struct usb_interface *interface)
1099 {
1100         struct usb_device *udev = interface_to_usbdev(interface);
1101         struct usb_host_interface *iface_desc = &interface->altsetting[0];
1102         struct usb_endpoint_descriptor *endpoint;
1103         unsigned char *cmd;
1104         u8 bulk_out_ep;
1105         int r;
1106
1107         if (iface_desc->desc.bNumEndpoints < 2)
1108                 return -ENODEV;
1109
1110         /* Find bulk out endpoint */
1111         for (r = 1; r >= 0; r--) {
1112                 endpoint = &iface_desc->endpoint[r].desc;
1113                 if (usb_endpoint_dir_out(endpoint) &&
1114                     usb_endpoint_xfer_bulk(endpoint)) {
1115                         bulk_out_ep = endpoint->bEndpointAddress;
1116                         break;
1117                 }
1118         }
1119         if (r == -1) {
1120                 dev_err(&udev->dev,
1121                         "ath9k_htc: Could not find bulk out endpoint\n");
1122                 return -ENODEV;
1123         }
1124
1125         cmd = kzalloc(31, GFP_KERNEL);
1126         if (cmd == NULL)
1127                 return -ENODEV;
1128
1129         /* USB bulk command block */
1130         cmd[0] = 0x55;  /* bulk command signature */
1131         cmd[1] = 0x53;  /* bulk command signature */
1132         cmd[2] = 0x42;  /* bulk command signature */
1133         cmd[3] = 0x43;  /* bulk command signature */
1134         cmd[14] = 6;    /* command length */
1135
1136         cmd[15] = 0x1b; /* SCSI command: START STOP UNIT */
1137         cmd[19] = 0x2;  /* eject disc */
1138
1139         dev_info(&udev->dev, "Ejecting storage device...\n");
1140         r = usb_bulk_msg(udev, usb_sndbulkpipe(udev, bulk_out_ep),
1141                 cmd, 31, NULL, 2000);
1142         kfree(cmd);
1143         if (r)
1144                 return r;
1145
1146         /* At this point, the device disconnects and reconnects with the real
1147          * ID numbers. */
1148
1149         usb_set_intfdata(interface, NULL);
1150         return 0;
1151 }
1152
1153 static int ath9k_hif_usb_probe(struct usb_interface *interface,
1154                                const struct usb_device_id *id)
1155 {
1156         struct usb_device *udev = interface_to_usbdev(interface);
1157         struct hif_device_usb *hif_dev;
1158         int ret = 0;
1159
1160         if (id->driver_info == STORAGE_DEVICE)
1161                 return send_eject_command(interface);
1162
1163         hif_dev = kzalloc(sizeof(struct hif_device_usb), GFP_KERNEL);
1164         if (!hif_dev) {
1165                 ret = -ENOMEM;
1166                 goto err_alloc;
1167         }
1168
1169         usb_get_dev(udev);
1170         hif_dev->udev = udev;
1171         hif_dev->interface = interface;
1172         hif_dev->device_id = id->idProduct;
1173 #ifdef CONFIG_PM
1174         udev->reset_resume = 1;
1175 #endif
1176         usb_set_intfdata(interface, hif_dev);
1177
1178         hif_dev->htc_handle = ath9k_htc_hw_alloc(hif_dev, &hif_usb,
1179                                                  &hif_dev->udev->dev);
1180         if (hif_dev->htc_handle == NULL) {
1181                 ret = -ENOMEM;
1182                 goto err_htc_hw_alloc;
1183         }
1184
1185         /* Find out which firmware to load */
1186
1187         if (IS_AR7010_DEVICE(id->driver_info))
1188                 hif_dev->fw_name = FIRMWARE_AR7010_1_1;
1189         else
1190                 hif_dev->fw_name = FIRMWARE_AR9271;
1191
1192         ret = ath9k_hif_usb_dev_init(hif_dev, id->driver_info);
1193         if (ret) {
1194                 ret = -EINVAL;
1195                 goto err_hif_init_usb;
1196         }
1197
1198         ret = ath9k_htc_hw_init(hif_dev->htc_handle,
1199                                 &interface->dev, hif_dev->device_id,
1200                                 hif_dev->udev->product, id->driver_info);
1201         if (ret) {
1202                 ret = -EINVAL;
1203                 goto err_htc_hw_init;
1204         }
1205
1206         dev_info(&hif_dev->udev->dev, "ath9k_htc: USB layer initialized\n");
1207
1208         return 0;
1209
1210 err_htc_hw_init:
1211         ath9k_hif_usb_dev_deinit(hif_dev);
1212 err_hif_init_usb:
1213         ath9k_htc_hw_free(hif_dev->htc_handle);
1214 err_htc_hw_alloc:
1215         usb_set_intfdata(interface, NULL);
1216         kfree(hif_dev);
1217         usb_put_dev(udev);
1218 err_alloc:
1219         return ret;
1220 }
1221
1222 static void ath9k_hif_usb_reboot(struct usb_device *udev)
1223 {
1224         u32 reboot_cmd = 0xffffffff;
1225         void *buf;
1226         int ret;
1227
1228         buf = kmemdup(&reboot_cmd, 4, GFP_KERNEL);
1229         if (!buf)
1230                 return;
1231
1232         ret = usb_bulk_msg(udev, usb_sndbulkpipe(udev, USB_REG_OUT_PIPE),
1233                            buf, 4, NULL, HZ);
1234         if (ret)
1235                 dev_err(&udev->dev, "ath9k_htc: USB reboot failed\n");
1236
1237         kfree(buf);
1238 }
1239
1240 static void ath9k_hif_usb_disconnect(struct usb_interface *interface)
1241 {
1242         struct usb_device *udev = interface_to_usbdev(interface);
1243         struct hif_device_usb *hif_dev = usb_get_intfdata(interface);
1244         bool unplugged = (udev->state == USB_STATE_NOTATTACHED) ? true : false;
1245
1246         if (!hif_dev)
1247                 return;
1248
1249         ath9k_htc_hw_deinit(hif_dev->htc_handle, unplugged);
1250         ath9k_htc_hw_free(hif_dev->htc_handle);
1251         ath9k_hif_usb_dev_deinit(hif_dev);
1252         usb_set_intfdata(interface, NULL);
1253
1254         if (!unplugged && (hif_dev->flags & HIF_USB_START))
1255                 ath9k_hif_usb_reboot(udev);
1256
1257         kfree(hif_dev);
1258         dev_info(&udev->dev, "ath9k_htc: USB layer deinitialized\n");
1259         usb_put_dev(udev);
1260 }
1261
1262 #ifdef CONFIG_PM
1263 static int ath9k_hif_usb_suspend(struct usb_interface *interface,
1264                                  pm_message_t message)
1265 {
1266         struct hif_device_usb *hif_dev = usb_get_intfdata(interface);
1267
1268         /*
1269          * The device has to be set to FULLSLEEP mode in case no
1270          * interface is up.
1271          */
1272         if (!(hif_dev->flags & HIF_USB_START))
1273                 ath9k_htc_suspend(hif_dev->htc_handle);
1274
1275         ath9k_hif_usb_dealloc_urbs(hif_dev);
1276
1277         return 0;
1278 }
1279
1280 static int ath9k_hif_usb_resume(struct usb_interface *interface)
1281 {
1282         struct hif_device_usb *hif_dev = usb_get_intfdata(interface);
1283         struct htc_target *htc_handle = hif_dev->htc_handle;
1284         int ret;
1285
1286         ret = ath9k_hif_usb_alloc_urbs(hif_dev);
1287         if (ret)
1288                 return ret;
1289
1290         if (hif_dev->firmware) {
1291                 ret = ath9k_hif_usb_download_fw(hif_dev,
1292                                 htc_handle->drv_priv->ah->hw_version.usbdev);
1293                 if (ret)
1294                         goto fail_resume;
1295         } else {
1296                 ath9k_hif_usb_dealloc_urbs(hif_dev);
1297                 return -EIO;
1298         }
1299
1300         mdelay(100);
1301
1302         ret = ath9k_htc_resume(htc_handle);
1303
1304         if (ret)
1305                 goto fail_resume;
1306
1307         return 0;
1308
1309 fail_resume:
1310         ath9k_hif_usb_dealloc_urbs(hif_dev);
1311
1312         return ret;
1313 }
1314 #endif
1315
1316 static struct usb_driver ath9k_hif_usb_driver = {
1317         .name = KBUILD_MODNAME,
1318         .probe = ath9k_hif_usb_probe,
1319         .disconnect = ath9k_hif_usb_disconnect,
1320 #ifdef CONFIG_PM
1321         .suspend = ath9k_hif_usb_suspend,
1322         .resume = ath9k_hif_usb_resume,
1323         .reset_resume = ath9k_hif_usb_resume,
1324 #endif
1325         .id_table = ath9k_hif_usb_ids,
1326         .soft_unbind = 1,
1327 };
1328
1329 int ath9k_hif_usb_init(void)
1330 {
1331         return usb_register(&ath9k_hif_usb_driver);
1332 }
1333
1334 void ath9k_hif_usb_exit(void)
1335 {
1336         usb_deregister(&ath9k_hif_usb_driver);
1337 }