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
  44         { USB_DEVICE(0x0cf3, 0x7015),
  45           .driver_info = AR9287_USB },  /* Atheros */
  46         { USB_DEVICE(0x1668, 0x1200),
  47           .driver_info = AR9287_USB },  /* Verizon */
  48
  49         { USB_DEVICE(0x0cf3, 0x7010),
  50           .driver_info = AR9280_USB },  /* Atheros */
  51         { USB_DEVICE(0x0846, 0x9018),
  52           .driver_info = AR9280_USB },  /* Netgear WNDA3200 */
  53         { USB_DEVICE(0x083A, 0xA704),
  54           .driver_info = AR9280_USB },  /* SMC Networks */
  55         { USB_DEVICE(0x0411, 0x017f),
  56           .driver_info = AR9280_USB },  /* Sony UWA-BR100 */
  57         { USB_DEVICE(0x04da, 0x3904),
  58           .driver_info = AR9280_USB },
  59
  60         { USB_DEVICE(0x0cf3, 0x20ff),
  61           .driver_info = STORAGE_DEVICE },
  62
  63         { },
  64 };
  65
  66 MODULE_DEVICE_TABLE(usb, ath9k_hif_usb_ids);
  67
  68 static int __hif_usb_tx(struct hif_device_usb *hif_dev);
  69
  70 static void hif_usb_regout_cb(struct urb *urb)
  71 {
  72         struct cmd_buf *cmd = (struct cmd_buf *)urb->context;
  73
  74         switch (urb->status) {
  75         case 0:
  76                 break;
  77         case -ENOENT:
  78         case -ECONNRESET:
  79         case -ENODEV:
  80         case -ESHUTDOWN:
  81                 goto free;
  82         default:
  83                 break;
  84         }
  85
  86         if (cmd) {
  87                 ath9k_htc_txcompletion_cb(cmd->hif_dev->htc_handle,
  88                                           cmd->skb, true);
  89                 kfree(cmd);
  90         }
  91
  92         return;
  93 free:
  94         kfree_skb(cmd->skb);
  95         kfree(cmd);
  96 }
  97
  98 static int hif_usb_send_regout(struct hif_device_usb *hif_dev,
  99                                struct sk_buff *skb)
 100 {
 101         struct urb *urb;
 102         struct cmd_buf *cmd;
 103         int ret = 0;
 104
 105         urb = usb_alloc_urb(0, GFP_KERNEL);
 106         if (urb == NULL)
 107                 return -ENOMEM;
 108
 109         cmd = kzalloc(sizeof(*cmd), GFP_KERNEL);
 110         if (cmd == NULL) {
 111                 usb_free_urb(urb);
 112                 return -ENOMEM;
 113         }
 114
 115         cmd->skb = skb;
 116         cmd->hif_dev = hif_dev;
 117
 118         usb_fill_bulk_urb(urb, hif_dev->udev,
 119                          usb_sndbulkpipe(hif_dev->udev, USB_REG_OUT_PIPE),
 120                          skb->data, skb->len,
 121                          hif_usb_regout_cb, cmd);
 122
 123         usb_anchor_urb(urb, &hif_dev->regout_submitted);
 124         ret = usb_submit_urb(urb, GFP_KERNEL);
 125         if (ret) {
 126                 usb_unanchor_urb(urb);
 127                 kfree(cmd);
 128         }
 129         usb_free_urb(urb);
 130
 131         return ret;
 132 }
 133
 134 static void hif_usb_mgmt_cb(struct urb *urb)
 135 {
 136         struct cmd_buf *cmd = (struct cmd_buf *)urb->context;
 137         struct hif_device_usb *hif_dev;
 138         bool txok = true;
 139
 140         if (!cmd || !cmd->skb || !cmd->hif_dev)
 141                 return;
 142
 143         hif_dev = cmd->hif_dev;
 144
 145         switch (urb->status) {
 146         case 0:
 147                 break;
 148         case -ENOENT:
 149         case -ECONNRESET:
 150         case -ENODEV:
 151         case -ESHUTDOWN:
 152                 txok = false;
 153
 154                 /*
 155                  * If the URBs are being flushed, no need to complete
 156                  * this packet.
 157                  */
 158                 spin_lock(&hif_dev->tx.tx_lock);
 159                 if (hif_dev->tx.flags & HIF_USB_TX_FLUSH) {
 160                         spin_unlock(&hif_dev->tx.tx_lock);
 161                         dev_kfree_skb_any(cmd->skb);
 162                         kfree(cmd);
 163                         return;
 164                 }
 165                 spin_unlock(&hif_dev->tx.tx_lock);
 166
 167                 break;
 168         default:
 169                 txok = false;
 170                 break;
 171         }
 172
 173         skb_pull(cmd->skb, 4);
 174         ath9k_htc_txcompletion_cb(cmd->hif_dev->htc_handle,
 175                                   cmd->skb, txok);
 176         kfree(cmd);
 177 }
 178
 179 static int hif_usb_send_mgmt(struct hif_device_usb *hif_dev,
 180                              struct sk_buff *skb)
 181 {
 182         struct urb *urb;
 183         struct cmd_buf *cmd;
 184         int ret = 0;
 185         __le16 *hdr;
 186
 187         urb = usb_alloc_urb(0, GFP_ATOMIC);
 188         if (urb == NULL)
 189                 return -ENOMEM;
 190
 191         cmd = kzalloc(sizeof(*cmd), GFP_ATOMIC);
 192         if (cmd == NULL) {
 193                 usb_free_urb(urb);
 194                 return -ENOMEM;
 195         }
 196
 197         cmd->skb = skb;
 198         cmd->hif_dev = hif_dev;
 199
 200         hdr = (__le16 *) skb_push(skb, 4);
 201         *hdr++ = cpu_to_le16(skb->len - 4);
 202         *hdr++ = cpu_to_le16(ATH_USB_TX_STREAM_MODE_TAG);
 203
 204         usb_fill_bulk_urb(urb, hif_dev->udev,
 205                          usb_sndbulkpipe(hif_dev->udev, USB_WLAN_TX_PIPE),
 206                          skb->data, skb->len,
 207                          hif_usb_mgmt_cb, cmd);
 208
 209         usb_anchor_urb(urb, &hif_dev->mgmt_submitted);
 210         ret = usb_submit_urb(urb, GFP_ATOMIC);
 211         if (ret) {
 212                 usb_unanchor_urb(urb);
 213                 kfree(cmd);
 214         }
 215         usb_free_urb(urb);
 216
 217         return ret;
 218 }
 219
 220 static inline void ath9k_skb_queue_purge(struct hif_device_usb *hif_dev,
 221                                          struct sk_buff_head *list)
 222 {
 223         struct sk_buff *skb;
 224
 225         while ((skb = __skb_dequeue(list)) != NULL) {
 226                 dev_kfree_skb_any(skb);
 227         }
 228 }
 229
 230 static inline void ath9k_skb_queue_complete(struct hif_device_usb *hif_dev,
 231                                             struct sk_buff_head *queue,
 232                                             bool txok)
 233 {
 234         struct sk_buff *skb;
 235
 236         while ((skb = __skb_dequeue(queue)) != NULL) {
 237                 ath9k_htc_txcompletion_cb(hif_dev->htc_handle,
 238                                           skb, txok);
 239                 if (txok)
 240                         TX_STAT_INC(skb_success);
 241                 else
 242                         TX_STAT_INC(skb_failed);
 243         }
 244 }
 245
 246 static void hif_usb_tx_cb(struct urb *urb)
 247 {
 248         struct tx_buf *tx_buf = (struct tx_buf *) urb->context;
 249         struct hif_device_usb *hif_dev;
 250         bool txok = true;
 251
 252         if (!tx_buf || !tx_buf->hif_dev)
 253                 return;
 254
 255         hif_dev = tx_buf->hif_dev;
 256
 257         switch (urb->status) {
 258         case 0:
 259                 break;
 260         case -ENOENT:
 261         case -ECONNRESET:
 262         case -ENODEV:
 263         case -ESHUTDOWN:
 264                 txok = false;
 265
 266                 /*
 267                  * If the URBs are being flushed, no need to add this
 268                  * URB to the free list.
 269                  */
 270                 spin_lock(&hif_dev->tx.tx_lock);
 271                 if (hif_dev->tx.flags & HIF_USB_TX_FLUSH) {
 272                         spin_unlock(&hif_dev->tx.tx_lock);
 273                         ath9k_skb_queue_purge(hif_dev, &tx_buf->skb_queue);
 274                         return;
 275                 }
 276                 spin_unlock(&hif_dev->tx.tx_lock);
 277
 278                 break;
 279         default:
 280                 txok = false;
 281                 break;
 282         }
 283
 284         ath9k_skb_queue_complete(hif_dev, &tx_buf->skb_queue, txok);
 285
 286         /* Re-initialize the SKB queue */
 287         tx_buf->len = tx_buf->offset = 0;
 288         __skb_queue_head_init(&tx_buf->skb_queue);
 289
 290         /* Add this TX buffer to the free list */
 291         spin_lock(&hif_dev->tx.tx_lock);
 292         list_move_tail(&tx_buf->list, &hif_dev->tx.tx_buf);
 293         hif_dev->tx.tx_buf_cnt++;
 294         if (!(hif_dev->tx.flags & HIF_USB_TX_STOP))
 295                 __hif_usb_tx(hif_dev); /* Check for pending SKBs */
 296         TX_STAT_INC(buf_completed);
 297         spin_unlock(&hif_dev->tx.tx_lock);
 298 }
 299
 300 /* TX lock has to be taken */
 301 static int __hif_usb_tx(struct hif_device_usb *hif_dev)
 302 {
 303         struct tx_buf *tx_buf = NULL;
 304         struct sk_buff *nskb = NULL;
 305         int ret = 0, i;
 306         u16 tx_skb_cnt = 0;
 307         u8 *buf;
 308         __le16 *hdr;
 309
 310         if (hif_dev->tx.tx_skb_cnt == 0)
 311                 return 0;
 312
 313         /* Check if a free TX buffer is available */
 314         if (list_empty(&hif_dev->tx.tx_buf))
 315                 return 0;
 316
 317         tx_buf = list_first_entry(&hif_dev->tx.tx_buf, struct tx_buf, list);
 318         list_move_tail(&tx_buf->list, &hif_dev->tx.tx_pending);
 319         hif_dev->tx.tx_buf_cnt--;
 320
 321         tx_skb_cnt = min_t(u16, hif_dev->tx.tx_skb_cnt, MAX_TX_AGGR_NUM);
 322
 323         for (i = 0; i < tx_skb_cnt; i++) {
 324                 nskb = __skb_dequeue(&hif_dev->tx.tx_skb_queue);
 325
 326                 /* Should never be NULL */
 327                 BUG_ON(!nskb);
 328
 329                 hif_dev->tx.tx_skb_cnt--;
 330
 331                 buf = tx_buf->buf;
 332                 buf += tx_buf->offset;
 333                 hdr = (__le16 *)buf;
 334                 *hdr++ = cpu_to_le16(nskb->len);
 335                 *hdr++ = cpu_to_le16(ATH_USB_TX_STREAM_MODE_TAG);
 336                 buf += 4;
 337                 memcpy(buf, nskb->data, nskb->len);
 338                 tx_buf->len = nskb->len + 4;
 339
 340                 if (i < (tx_skb_cnt - 1))
 341                         tx_buf->offset += (((tx_buf->len - 1) / 4) + 1) * 4;
 342
 343                 if (i == (tx_skb_cnt - 1))
 344                         tx_buf->len += tx_buf->offset;
 345
 346                 __skb_queue_tail(&tx_buf->skb_queue, nskb);
 347                 TX_STAT_INC(skb_queued);
 348         }
 349
 350         usb_fill_bulk_urb(tx_buf->urb, hif_dev->udev,
 351                           usb_sndbulkpipe(hif_dev->udev, USB_WLAN_TX_PIPE),
 352                           tx_buf->buf, tx_buf->len,
 353                           hif_usb_tx_cb, tx_buf);
 354
 355         ret = usb_submit_urb(tx_buf->urb, GFP_ATOMIC);
 356         if (ret) {
 357                 tx_buf->len = tx_buf->offset = 0;
 358                 ath9k_skb_queue_complete(hif_dev, &tx_buf->skb_queue, false);
 359                 __skb_queue_head_init(&tx_buf->skb_queue);
 360                 list_move_tail(&tx_buf->list, &hif_dev->tx.tx_buf);
 361                 hif_dev->tx.tx_buf_cnt++;
 362         }
 363
 364         if (!ret)
 365                 TX_STAT_INC(buf_queued);
 366
 367         return ret;
 368 }
 369
 370 static int hif_usb_send_tx(struct hif_device_usb *hif_dev, struct sk_buff *skb)
 371 {
 372         struct ath9k_htc_tx_ctl *tx_ctl;
 373         unsigned long flags;
 374         int ret = 0;
 375
 376         spin_lock_irqsave(&hif_dev->tx.tx_lock, flags);
 377
 378         if (hif_dev->tx.flags & HIF_USB_TX_STOP) {
 379                 spin_unlock_irqrestore(&hif_dev->tx.tx_lock, flags);
 380                 return -ENODEV;
 381         }
 382
 383         /* Check if the max queue count has been reached */
 384         if (hif_dev->tx.tx_skb_cnt > MAX_TX_BUF_NUM) {
 385                 spin_unlock_irqrestore(&hif_dev->tx.tx_lock, flags);
 386                 return -ENOMEM;
 387         }
 388
 389         spin_unlock_irqrestore(&hif_dev->tx.tx_lock, flags);
 390
 391         tx_ctl = HTC_SKB_CB(skb);
 392
 393         /* Mgmt/Beacon frames don't use the TX buffer pool */
 394         if ((tx_ctl->type == ATH9K_HTC_MGMT) ||
 395             (tx_ctl->type == ATH9K_HTC_BEACON)) {
 396                 ret = hif_usb_send_mgmt(hif_dev, skb);
 397         }
 398
 399         spin_lock_irqsave(&hif_dev->tx.tx_lock, flags);
 400
 401         if ((tx_ctl->type == ATH9K_HTC_NORMAL) ||
 402             (tx_ctl->type == ATH9K_HTC_AMPDU)) {
 403                 __skb_queue_tail(&hif_dev->tx.tx_skb_queue, skb);
 404                 hif_dev->tx.tx_skb_cnt++;
 405         }
 406
 407         /* Check if AMPDUs have to be sent immediately */
 408         if ((hif_dev->tx.tx_buf_cnt == MAX_TX_URB_NUM) &&
 409             (hif_dev->tx.tx_skb_cnt < 2)) {
 410                 __hif_usb_tx(hif_dev);
 411         }
 412
 413         spin_unlock_irqrestore(&hif_dev->tx.tx_lock, flags);
 414
 415         return ret;
 416 }
 417
 418 static void hif_usb_start(void *hif_handle)
 419 {
 420         struct hif_device_usb *hif_dev = (struct hif_device_usb *)hif_handle;
 421         unsigned long flags;
 422
 423         hif_dev->flags |= HIF_USB_START;
 424
 425         spin_lock_irqsave(&hif_dev->tx.tx_lock, flags);
 426         hif_dev->tx.flags &= ~HIF_USB_TX_STOP;
 427         spin_unlock_irqrestore(&hif_dev->tx.tx_lock, flags);
 428 }
 429
 430 static void hif_usb_stop(void *hif_handle)
 431 {
 432         struct hif_device_usb *hif_dev = (struct hif_device_usb *)hif_handle;
 433         struct tx_buf *tx_buf = NULL, *tx_buf_tmp = NULL;
 434         unsigned long flags;
 435
 436         spin_lock_irqsave(&hif_dev->tx.tx_lock, flags);
 437         ath9k_skb_queue_complete(hif_dev, &hif_dev->tx.tx_skb_queue, false);
 438         hif_dev->tx.tx_skb_cnt = 0;
 439         hif_dev->tx.flags |= HIF_USB_TX_STOP;
 440         spin_unlock_irqrestore(&hif_dev->tx.tx_lock, flags);
 441
 442         /* The pending URBs have to be canceled. */
 443         list_for_each_entry_safe(tx_buf, tx_buf_tmp,
 444                                  &hif_dev->tx.tx_pending, list) {
 445                 usb_kill_urb(tx_buf->urb);
 446         }
 447
 448         usb_kill_anchored_urbs(&hif_dev->mgmt_submitted);
 449 }
 450
 451 static int hif_usb_send(void *hif_handle, u8 pipe_id, struct sk_buff *skb)
 452 {
 453         struct hif_device_usb *hif_dev = (struct hif_device_usb *)hif_handle;
 454         int ret = 0;
 455
 456         switch (pipe_id) {
 457         case USB_WLAN_TX_PIPE:
 458                 ret = hif_usb_send_tx(hif_dev, skb);
 459                 break;
 460         case USB_REG_OUT_PIPE:
 461                 ret = hif_usb_send_regout(hif_dev, skb);
 462                 break;
 463         default:
 464                 dev_err(&hif_dev->udev->dev,
 465                         "ath9k_htc: Invalid TX pipe: %d\n", pipe_id);
 466                 ret = -EINVAL;
 467                 break;
 468         }
 469
 470         return ret;
 471 }
 472
 473 static inline bool check_index(struct sk_buff *skb, u8 idx)
 474 {
 475         struct ath9k_htc_tx_ctl *tx_ctl;
 476
 477         tx_ctl = HTC_SKB_CB(skb);
 478
 479         if ((tx_ctl->type == ATH9K_HTC_AMPDU) &&
 480             (tx_ctl->sta_idx == idx))
 481                 return true;
 482
 483         return false;
 484 }
 485
 486 static void hif_usb_sta_drain(void *hif_handle, u8 idx)
 487 {
 488         struct hif_device_usb *hif_dev = (struct hif_device_usb *)hif_handle;
 489         struct sk_buff *skb, *tmp;
 490         unsigned long flags;
 491
 492         spin_lock_irqsave(&hif_dev->tx.tx_lock, flags);
 493
 494         skb_queue_walk_safe(&hif_dev->tx.tx_skb_queue, skb, tmp) {
 495                 if (check_index(skb, idx)) {
 496                         __skb_unlink(skb, &hif_dev->tx.tx_skb_queue);
 497                         ath9k_htc_txcompletion_cb(hif_dev->htc_handle,
 498                                                   skb, false);
 499                         hif_dev->tx.tx_skb_cnt--;
 500                         TX_STAT_INC(skb_failed);
 501                 }
 502         }
 503
 504         spin_unlock_irqrestore(&hif_dev->tx.tx_lock, flags);
 505 }
 506
 507 static struct ath9k_htc_hif hif_usb = {
 508         .transport = ATH9K_HIF_USB,
 509         .name = "ath9k_hif_usb",
 510
 511         .control_ul_pipe = USB_REG_OUT_PIPE,
 512         .control_dl_pipe = USB_REG_IN_PIPE,
 513
 514         .start = hif_usb_start,
 515         .stop = hif_usb_stop,
 516         .sta_drain = hif_usb_sta_drain,
 517         .send = hif_usb_send,
 518 };
 519
 520 static void ath9k_hif_usb_rx_stream(struct hif_device_usb *hif_dev,
 521                                     struct sk_buff *skb)
 522 {
 523         struct sk_buff *nskb, *skb_pool[MAX_PKT_NUM_IN_TRANSFER];
 524         int index = 0, i = 0, len = skb->len;
 525         int rx_remain_len, rx_pkt_len;
 526         u16 pool_index = 0;
 527         u8 *ptr;
 528
 529         spin_lock(&hif_dev->rx_lock);
 530
 531         rx_remain_len = hif_dev->rx_remain_len;
 532         rx_pkt_len = hif_dev->rx_transfer_len;
 533
 534         if (rx_remain_len != 0) {
 535                 struct sk_buff *remain_skb = hif_dev->remain_skb;
 536
 537                 if (remain_skb) {
 538                         ptr = (u8 *) remain_skb->data;
 539
 540                         index = rx_remain_len;
 541                         rx_remain_len -= hif_dev->rx_pad_len;
 542                         ptr += rx_pkt_len;
 543
 544                         memcpy(ptr, skb->data, rx_remain_len);
 545
 546                         rx_pkt_len += rx_remain_len;
 547                         hif_dev->rx_remain_len = 0;
 548                         skb_put(remain_skb, rx_pkt_len);
 549
 550                         skb_pool[pool_index++] = remain_skb;
 551
 552                 } else {
 553                         index = rx_remain_len;
 554                 }
 555         }
 556
 557         spin_unlock(&hif_dev->rx_lock);
 558
 559         while (index < len) {
 560                 u16 pkt_len;
 561                 u16 pkt_tag;
 562                 u16 pad_len;
 563                 int chk_idx;
 564
 565                 ptr = (u8 *) skb->data;
 566
 567                 pkt_len = get_unaligned_le16(ptr + index);
 568                 pkt_tag = get_unaligned_le16(ptr + index + 2);
 569
 570                 if (pkt_tag != ATH_USB_RX_STREAM_MODE_TAG) {
 571                         RX_STAT_INC(skb_dropped);
 572                         return;
 573                 }
 574
 575                 pad_len = 4 - (pkt_len & 0x3);
 576                 if (pad_len == 4)
 577                         pad_len = 0;
 578
 579                 chk_idx = index;
 580                 index = index + 4 + pkt_len + pad_len;
 581
 582                 if (index > MAX_RX_BUF_SIZE) {
 583                         spin_lock(&hif_dev->rx_lock);
 584                         hif_dev->rx_remain_len = index - MAX_RX_BUF_SIZE;
 585                         hif_dev->rx_transfer_len =
 586                                 MAX_RX_BUF_SIZE - chk_idx - 4;
 587                         hif_dev->rx_pad_len = pad_len;
 588
 589                         nskb = __dev_alloc_skb(pkt_len + 32, GFP_ATOMIC);
 590                         if (!nskb) {
 591                                 dev_err(&hif_dev->udev->dev,
 592                                         "ath9k_htc: RX memory allocation error\n");
 593                                 spin_unlock(&hif_dev->rx_lock);
 594                                 goto err;
 595                         }
 596                         skb_reserve(nskb, 32);
 597                         RX_STAT_INC(skb_allocated);
 598
 599                         memcpy(nskb->data, &(skb->data[chk_idx+4]),
 600                                hif_dev->rx_transfer_len);
 601
 602                         /* Record the buffer pointer */
 603                         hif_dev->remain_skb = nskb;
 604                         spin_unlock(&hif_dev->rx_lock);
 605                 } else {
 606                         nskb = __dev_alloc_skb(pkt_len + 32, GFP_ATOMIC);
 607                         if (!nskb) {
 608                                 dev_err(&hif_dev->udev->dev,
 609                                         "ath9k_htc: RX memory allocation error\n");
 610                                 goto err;
 611                         }
 612                         skb_reserve(nskb, 32);
 613                         RX_STAT_INC(skb_allocated);
 614
 615                         memcpy(nskb->data, &(skb->data[chk_idx+4]), pkt_len);
 616                         skb_put(nskb, pkt_len);
 617                         skb_pool[pool_index++] = nskb;
 618                 }
 619         }
 620
 621 err:
 622         for (i = 0; i < pool_index; i++) {
 623                 ath9k_htc_rx_msg(hif_dev->htc_handle, skb_pool[i],
 624                                  skb_pool[i]->len, USB_WLAN_RX_PIPE);
 625                 RX_STAT_INC(skb_completed);
 626         }
 627 }
 628
 629 static void ath9k_hif_usb_rx_cb(struct urb *urb)
 630 {
 631         struct sk_buff *skb = (struct sk_buff *) urb->context;
 632         struct hif_device_usb *hif_dev =
 633                 usb_get_intfdata(usb_ifnum_to_if(urb->dev, 0));
 634         int ret;
 635
 636         if (!skb)
 637                 return;
 638
 639         if (!hif_dev)
 640                 goto free;
 641
 642         switch (urb->status) {
 643         case 0:
 644                 break;
 645         case -ENOENT:
 646         case -ECONNRESET:
 647         case -ENODEV:
 648         case -ESHUTDOWN:
 649                 goto free;
 650         default:
 651                 goto resubmit;
 652         }
 653
 654         if (likely(urb->actual_length != 0)) {
 655                 skb_put(skb, urb->actual_length);
 656                 ath9k_hif_usb_rx_stream(hif_dev, skb);
 657         }
 658
 659 resubmit:
 660         skb_reset_tail_pointer(skb);
 661         skb_trim(skb, 0);
 662
 663         usb_anchor_urb(urb, &hif_dev->rx_submitted);
 664         ret = usb_submit_urb(urb, GFP_ATOMIC);
 665         if (ret) {
 666                 usb_unanchor_urb(urb);
 667                 goto free;
 668         }
 669
 670         return;
 671 free:
 672         kfree_skb(skb);
 673 }
 674
 675 static void ath9k_hif_usb_reg_in_cb(struct urb *urb)
 676 {
 677         struct sk_buff *skb = (struct sk_buff *) urb->context;
 678         struct sk_buff *nskb;
 679         struct hif_device_usb *hif_dev =
 680                 usb_get_intfdata(usb_ifnum_to_if(urb->dev, 0));
 681         int ret;
 682
 683         if (!skb)
 684                 return;
 685
 686         if (!hif_dev)
 687                 goto free;
 688
 689         switch (urb->status) {
 690         case 0:
 691                 break;
 692         case -ENOENT:
 693         case -ECONNRESET:
 694         case -ENODEV:
 695         case -ESHUTDOWN:
 696                 goto free;
 697         default:
 698                 skb_reset_tail_pointer(skb);
 699                 skb_trim(skb, 0);
 700
 701                 goto resubmit;
 702         }
 703
 704         if (likely(urb->actual_length != 0)) {
 705                 skb_put(skb, urb->actual_length);
 706
 707                 /* Process the command first */
 708                 ath9k_htc_rx_msg(hif_dev->htc_handle, skb,
 709                                  skb->len, USB_REG_IN_PIPE);
 710
 711
 712                 nskb = alloc_skb(MAX_REG_IN_BUF_SIZE, GFP_ATOMIC);
 713                 if (!nskb) {
 714                         dev_err(&hif_dev->udev->dev,
 715                                 "ath9k_htc: REG_IN memory allocation failure\n");
 716                         urb->context = NULL;
 717                         return;
 718                 }
 719
 720                 usb_fill_bulk_urb(urb, hif_dev->udev,
 721                                  usb_rcvbulkpipe(hif_dev->udev,
 722                                                  USB_REG_IN_PIPE),
 723                                  nskb->data, MAX_REG_IN_BUF_SIZE,
 724                                  ath9k_hif_usb_reg_in_cb, nskb);
 725         }
 726
 727 resubmit:
 728         usb_anchor_urb(urb, &hif_dev->reg_in_submitted);
 729         ret = usb_submit_urb(urb, GFP_ATOMIC);
 730         if (ret) {
 731                 usb_unanchor_urb(urb);
 732                 goto free;
 733         }
 734
 735         return;
 736 free:
 737         kfree_skb(skb);
 738         urb->context = NULL;
 739 }
 740
 741 static void ath9k_hif_usb_dealloc_tx_urbs(struct hif_device_usb *hif_dev)
 742 {
 743         struct tx_buf *tx_buf = NULL, *tx_buf_tmp = NULL;
 744         unsigned long flags;
 745
 746         list_for_each_entry_safe(tx_buf, tx_buf_tmp,
 747                                  &hif_dev->tx.tx_buf, list) {
 748                 usb_kill_urb(tx_buf->urb);
 749                 list_del(&tx_buf->list);
 750                 usb_free_urb(tx_buf->urb);
 751                 kfree(tx_buf->buf);
 752                 kfree(tx_buf);
 753         }
 754
 755         spin_lock_irqsave(&hif_dev->tx.tx_lock, flags);
 756         hif_dev->tx.flags |= HIF_USB_TX_FLUSH;
 757         spin_unlock_irqrestore(&hif_dev->tx.tx_lock, flags);
 758
 759         list_for_each_entry_safe(tx_buf, tx_buf_tmp,
 760                                  &hif_dev->tx.tx_pending, list) {
 761                 usb_kill_urb(tx_buf->urb);
 762                 list_del(&tx_buf->list);
 763                 usb_free_urb(tx_buf->urb);
 764                 kfree(tx_buf->buf);
 765                 kfree(tx_buf);
 766         }
 767
 768         usb_kill_anchored_urbs(&hif_dev->mgmt_submitted);
 769 }
 770
 771 static int ath9k_hif_usb_alloc_tx_urbs(struct hif_device_usb *hif_dev)
 772 {
 773         struct tx_buf *tx_buf;
 774         int i;
 775
 776         INIT_LIST_HEAD(&hif_dev->tx.tx_buf);
 777         INIT_LIST_HEAD(&hif_dev->tx.tx_pending);
 778         spin_lock_init(&hif_dev->tx.tx_lock);
 779         __skb_queue_head_init(&hif_dev->tx.tx_skb_queue);
 780         init_usb_anchor(&hif_dev->mgmt_submitted);
 781
 782         for (i = 0; i < MAX_TX_URB_NUM; i++) {
 783                 tx_buf = kzalloc(sizeof(struct tx_buf), GFP_KERNEL);
 784                 if (!tx_buf)
 785                         goto err;
 786
 787                 tx_buf->buf = kzalloc(MAX_TX_BUF_SIZE, GFP_KERNEL);
 788                 if (!tx_buf->buf)
 789                         goto err;
 790
 791                 tx_buf->urb = usb_alloc_urb(0, GFP_KERNEL);
 792                 if (!tx_buf->urb)
 793                         goto err;
 794
 795                 tx_buf->hif_dev = hif_dev;
 796                 __skb_queue_head_init(&tx_buf->skb_queue);
 797
 798                 list_add_tail(&tx_buf->list, &hif_dev->tx.tx_buf);
 799         }
 800
 801         hif_dev->tx.tx_buf_cnt = MAX_TX_URB_NUM;
 802
 803         return 0;
 804 err:
 805         if (tx_buf) {
 806                 kfree(tx_buf->buf);
 807                 kfree(tx_buf);
 808         }
 809         ath9k_hif_usb_dealloc_tx_urbs(hif_dev);
 810         return -ENOMEM;
 811 }
 812
 813 static void ath9k_hif_usb_dealloc_rx_urbs(struct hif_device_usb *hif_dev)
 814 {
 815         usb_kill_anchored_urbs(&hif_dev->rx_submitted);
 816 }
 817
 818 static int ath9k_hif_usb_alloc_rx_urbs(struct hif_device_usb *hif_dev)
 819 {
 820         struct urb *urb = NULL;
 821         struct sk_buff *skb = NULL;
 822         int i, ret;
 823
 824         init_usb_anchor(&hif_dev->rx_submitted);
 825         spin_lock_init(&hif_dev->rx_lock);
 826
 827         for (i = 0; i < MAX_RX_URB_NUM; i++) {
 828
 829                 /* Allocate URB */
 830                 urb = usb_alloc_urb(0, GFP_KERNEL);
 831                 if (urb == NULL) {
 832                         ret = -ENOMEM;
 833                         goto err_urb;
 834                 }
 835
 836                 /* Allocate buffer */
 837                 skb = alloc_skb(MAX_RX_BUF_SIZE, GFP_KERNEL);
 838                 if (!skb) {
 839                         ret = -ENOMEM;
 840                         goto err_skb;
 841                 }
 842
 843                 usb_fill_bulk_urb(urb, hif_dev->udev,
 844                                   usb_rcvbulkpipe(hif_dev->udev,
 845                                                   USB_WLAN_RX_PIPE),
 846                                   skb->data, MAX_RX_BUF_SIZE,
 847                                   ath9k_hif_usb_rx_cb, skb);
 848
 849                 /* Anchor URB */
 850                 usb_anchor_urb(urb, &hif_dev->rx_submitted);
 851
 852                 /* Submit URB */
 853                 ret = usb_submit_urb(urb, GFP_KERNEL);
 854                 if (ret) {
 855                         usb_unanchor_urb(urb);
 856                         goto err_submit;
 857                 }
 858
 859                 /*
 860                  * Drop reference count.
 861                  * This ensures that the URB is freed when killing them.
 862                  */
 863                 usb_free_urb(urb);
 864         }
 865
 866         return 0;
 867
 868 err_submit:
 869         kfree_skb(skb);
 870 err_skb:
 871         usb_free_urb(urb);
 872 err_urb:
 873         ath9k_hif_usb_dealloc_rx_urbs(hif_dev);
 874         return ret;
 875 }
 876
 877 static void ath9k_hif_usb_dealloc_reg_in_urbs(struct hif_device_usb *hif_dev)
 878 {
 879         usb_kill_anchored_urbs(&hif_dev->reg_in_submitted);
 880 }
 881
 882 static int ath9k_hif_usb_alloc_reg_in_urbs(struct hif_device_usb *hif_dev)
 883 {
 884         struct urb *urb = NULL;
 885         struct sk_buff *skb = NULL;
 886         int i, ret;
 887
 888         init_usb_anchor(&hif_dev->reg_in_submitted);
 889
 890         for (i = 0; i < MAX_REG_IN_URB_NUM; i++) {
 891
 892                 /* Allocate URB */
 893                 urb = usb_alloc_urb(0, GFP_KERNEL);
 894                 if (urb == NULL) {
 895                         ret = -ENOMEM;
 896                         goto err_urb;
 897                 }
 898
 899                 /* Allocate buffer */
 900                 skb = alloc_skb(MAX_REG_IN_BUF_SIZE, GFP_KERNEL);
 901                 if (!skb) {
 902                         ret = -ENOMEM;
 903                         goto err_skb;
 904                 }
 905
 906                 usb_fill_bulk_urb(urb, hif_dev->udev,
 907                                   usb_rcvbulkpipe(hif_dev->udev,
 908                                                   USB_REG_IN_PIPE),
 909                                   skb->data, MAX_REG_IN_BUF_SIZE,
 910                                   ath9k_hif_usb_reg_in_cb, skb);
 911
 912                 /* Anchor URB */
 913                 usb_anchor_urb(urb, &hif_dev->reg_in_submitted);
 914
 915                 /* Submit URB */
 916                 ret = usb_submit_urb(urb, GFP_KERNEL);
 917                 if (ret) {
 918                         usb_unanchor_urb(urb);
 919                         goto err_submit;
 920                 }
 921
 922                 /*
 923                  * Drop reference count.
 924                  * This ensures that the URB is freed when killing them.
 925                  */
 926                 usb_free_urb(urb);
 927         }
 928
 929         return 0;
 930
 931 err_submit:
 932         kfree_skb(skb);
 933 err_skb:
 934         usb_free_urb(urb);
 935 err_urb:
 936         ath9k_hif_usb_dealloc_reg_in_urbs(hif_dev);
 937         return ret;
 938 }
 939
 940 static int ath9k_hif_usb_alloc_urbs(struct hif_device_usb *hif_dev)
 941 {
 942         /* Register Write */
 943         init_usb_anchor(&hif_dev->regout_submitted);
 944
 945         /* TX */
 946         if (ath9k_hif_usb_alloc_tx_urbs(hif_dev) < 0)
 947                 goto err;
 948
 949         /* RX */
 950         if (ath9k_hif_usb_alloc_rx_urbs(hif_dev) < 0)
 951                 goto err_rx;
 952
 953         /* Register Read */
 954         if (ath9k_hif_usb_alloc_reg_in_urbs(hif_dev) < 0)
 955                 goto err_reg;
 956
 957         return 0;
 958 err_reg:
 959         ath9k_hif_usb_dealloc_rx_urbs(hif_dev);
 960 err_rx:
 961         ath9k_hif_usb_dealloc_tx_urbs(hif_dev);
 962 err:
 963         return -ENOMEM;
 964 }
 965
 966 static void ath9k_hif_usb_dealloc_urbs(struct hif_device_usb *hif_dev)
 967 {
 968         usb_kill_anchored_urbs(&hif_dev->regout_submitted);
 969         ath9k_hif_usb_dealloc_reg_in_urbs(hif_dev);
 970         ath9k_hif_usb_dealloc_tx_urbs(hif_dev);
 971         ath9k_hif_usb_dealloc_rx_urbs(hif_dev);
 972 }
 973
 974 static int ath9k_hif_usb_download_fw(struct hif_device_usb *hif_dev)
 975 {
 976         int transfer, err;
 977         const void *data = hif_dev->fw_data;
 978         size_t len = hif_dev->fw_size;
 979         u32 addr = AR9271_FIRMWARE;
 980         u8 *buf = kzalloc(4096, GFP_KERNEL);
 981         u32 firm_offset;
 982
 983         if (!buf)
 984                 return -ENOMEM;
 985
 986         while (len) {
 987                 transfer = min_t(size_t, len, 4096);
 988                 memcpy(buf, data, transfer);
 989
 990                 err = usb_control_msg(hif_dev->udev,
 991                                       usb_sndctrlpipe(hif_dev->udev, 0),
 992                                       FIRMWARE_DOWNLOAD, 0x40 | USB_DIR_OUT,
 993                                       addr >> 8, 0, buf, transfer, HZ);
 994                 if (err < 0) {
 995                         kfree(buf);
 996                         return err;
 997                 }
 998
 999                 len -= transfer;
1000                 data += transfer;
1001                 addr += transfer;
1002         }
1003         kfree(buf);
1004
1005         if (IS_AR7010_DEVICE(hif_dev->usb_device_id->driver_info))
1006                 firm_offset = AR7010_FIRMWARE_TEXT;
1007         else
1008                 firm_offset = AR9271_FIRMWARE_TEXT;
1009
1010         /*
1011          * Issue FW download complete command to firmware.
1012          */
1013         err = usb_control_msg(hif_dev->udev, usb_sndctrlpipe(hif_dev->udev, 0),
1014                               FIRMWARE_DOWNLOAD_COMP,
1015                               0x40 | USB_DIR_OUT,
1016                               firm_offset >> 8, 0, NULL, 0, HZ);
1017         if (err)
1018                 return -EIO;
1019
1020         dev_info(&hif_dev->udev->dev, "ath9k_htc: Transferred FW: %s, size: %ld\n",
1021                  hif_dev->fw_name, (unsigned long) hif_dev->fw_size);
1022
1023         return 0;
1024 }
1025
1026 static int ath9k_hif_usb_dev_init(struct hif_device_usb *hif_dev)
1027 {
1028         struct usb_host_interface *alt = &hif_dev->interface->altsetting[0];
1029         struct usb_endpoint_descriptor *endp;
1030         int ret, idx;
1031
1032         ret = ath9k_hif_usb_download_fw(hif_dev);
1033         if (ret) {
1034                 dev_err(&hif_dev->udev->dev,
1035                         "ath9k_htc: Firmware - %s download failed\n",
1036                         hif_dev->fw_name);
1037                 return ret;
1038         }
1039
1040         /* On downloading the firmware to the target, the USB descriptor of EP4
1041          * is 'patched' to change the type of the endpoint to Bulk. This will
1042          * bring down CPU usage during the scan period.
1043          */
1044         for (idx = 0; idx < alt->desc.bNumEndpoints; idx++) {
1045                 endp = &alt->endpoint[idx].desc;
1046                 if ((endp->bmAttributes & USB_ENDPOINT_XFERTYPE_MASK)
1047                                 == USB_ENDPOINT_XFER_INT) {
1048                         endp->bmAttributes &= ~USB_ENDPOINT_XFERTYPE_MASK;
1049                         endp->bmAttributes |= USB_ENDPOINT_XFER_BULK;
1050                         endp->bInterval = 0;
1051                 }
1052         }
1053
1054         /* Alloc URBs */
1055         ret = ath9k_hif_usb_alloc_urbs(hif_dev);
1056         if (ret) {
1057                 dev_err(&hif_dev->udev->dev,
1058                         "ath9k_htc: Unable to allocate URBs\n");
1059                 return ret;
1060         }
1061
1062         return 0;
1063 }
1064
1065 static void ath9k_hif_usb_dev_deinit(struct hif_device_usb *hif_dev)
1066 {
1067         ath9k_hif_usb_dealloc_urbs(hif_dev);
1068 }
1069
1070 /*
1071  * If initialization fails or the FW cannot be retrieved,
1072  * detach the device.
1073  */
1074 static void ath9k_hif_usb_firmware_fail(struct hif_device_usb *hif_dev)
1075 {
1076         struct device *dev = &hif_dev->udev->dev;
1077         struct device *parent = dev->parent;
1078
1079         complete(&hif_dev->fw_done);
1080
1081         if (parent)
1082                 device_lock(parent);
1083
1084         device_release_driver(dev);
1085
1086         if (parent)
1087                 device_unlock(parent);
1088 }
1089
1090 static void ath9k_hif_usb_firmware_cb(const struct firmware *fw, void *context)
1091 {
1092         struct hif_device_usb *hif_dev = context;
1093         int ret;
1094
1095         if (!fw) {
1096                 dev_err(&hif_dev->udev->dev,
1097                         "ath9k_htc: Failed to get firmware %s\n",
1098                         hif_dev->fw_name);
1099                 goto err_fw;
1100         }
1101
1102         hif_dev->htc_handle = ath9k_htc_hw_alloc(hif_dev, &hif_usb,
1103                                                  &hif_dev->udev->dev);
1104         if (hif_dev->htc_handle == NULL)
1105                 goto err_dev_alloc;
1106
1107         hif_dev->fw_data = fw->data;
1108         hif_dev->fw_size = fw->size;
1109
1110         /* Proceed with initialization */
1111
1112         ret = ath9k_hif_usb_dev_init(hif_dev);
1113         if (ret)
1114                 goto err_dev_init;
1115
1116         ret = ath9k_htc_hw_init(hif_dev->htc_handle,
1117                                 &hif_dev->interface->dev,
1118                                 hif_dev->usb_device_id->idProduct,
1119                                 hif_dev->udev->product,
1120                                 hif_dev->usb_device_id->driver_info);
1121         if (ret) {
1122                 ret = -EINVAL;
1123                 goto err_htc_hw_init;
1124         }
1125
1126         release_firmware(fw);
1127         hif_dev->flags |= HIF_USB_READY;
1128         complete(&hif_dev->fw_done);
1129
1130         return;
1131
1132 err_htc_hw_init:
1133         ath9k_hif_usb_dev_deinit(hif_dev);
1134 err_dev_init:
1135         ath9k_htc_hw_free(hif_dev->htc_handle);
1136 err_dev_alloc:
1137         release_firmware(fw);
1138 err_fw:
1139         ath9k_hif_usb_firmware_fail(hif_dev);
1140 }
1141
1142 /*
1143  * An exact copy of the function from zd1211rw.
1144  */
1145 static int send_eject_command(struct usb_interface *interface)
1146 {
1147         struct usb_device *udev = interface_to_usbdev(interface);
1148         struct usb_host_interface *iface_desc = &interface->altsetting[0];
1149         struct usb_endpoint_descriptor *endpoint;
1150         unsigned char *cmd;
1151         u8 bulk_out_ep;
1152         int r;
1153
1154         /* Find bulk out endpoint */
1155         for (r = 1; r >= 0; r--) {
1156                 endpoint = &iface_desc->endpoint[r].desc;
1157                 if (usb_endpoint_dir_out(endpoint) &&
1158                     usb_endpoint_xfer_bulk(endpoint)) {
1159                         bulk_out_ep = endpoint->bEndpointAddress;
1160                         break;
1161                 }
1162         }
1163         if (r == -1) {
1164                 dev_err(&udev->dev,
1165                         "ath9k_htc: Could not find bulk out endpoint\n");
1166                 return -ENODEV;
1167         }
1168
1169         cmd = kzalloc(31, GFP_KERNEL);
1170         if (cmd == NULL)
1171                 return -ENODEV;
1172
1173         /* USB bulk command block */
1174         cmd[0] = 0x55;  /* bulk command signature */
1175         cmd[1] = 0x53;  /* bulk command signature */
1176         cmd[2] = 0x42;  /* bulk command signature */
1177         cmd[3] = 0x43;  /* bulk command signature */
1178         cmd[14] = 6;    /* command length */
1179
1180         cmd[15] = 0x1b; /* SCSI command: START STOP UNIT */
1181         cmd[19] = 0x2;  /* eject disc */
1182
1183         dev_info(&udev->dev, "Ejecting storage device...\n");
1184         r = usb_bulk_msg(udev, usb_sndbulkpipe(udev, bulk_out_ep),
1185                 cmd, 31, NULL, 2000);
1186         kfree(cmd);
1187         if (r)
1188                 return r;
1189
1190         /* At this point, the device disconnects and reconnects with the real
1191          * ID numbers. */
1192
1193         usb_set_intfdata(interface, NULL);
1194         return 0;
1195 }
1196
1197 static int ath9k_hif_usb_probe(struct usb_interface *interface,
1198                                const struct usb_device_id *id)
1199 {
1200         struct usb_device *udev = interface_to_usbdev(interface);
1201         struct hif_device_usb *hif_dev;
1202         int ret = 0;
1203
1204         if (id->driver_info == STORAGE_DEVICE)
1205                 return send_eject_command(interface);
1206
1207         hif_dev = kzalloc(sizeof(struct hif_device_usb), GFP_KERNEL);
1208         if (!hif_dev) {
1209                 ret = -ENOMEM;
1210                 goto err_alloc;
1211         }
1212
1213         usb_get_dev(udev);
1214
1215         hif_dev->udev = udev;
1216         hif_dev->interface = interface;
1217         hif_dev->usb_device_id = id;
1218 #ifdef CONFIG_PM
1219         udev->reset_resume = 1;
1220 #endif
1221         usb_set_intfdata(interface, hif_dev);
1222
1223         init_completion(&hif_dev->fw_done);
1224
1225         /* Find out which firmware to load */
1226
1227         if (IS_AR7010_DEVICE(id->driver_info))
1228                 hif_dev->fw_name = FIRMWARE_AR7010_1_1;
1229         else
1230                 hif_dev->fw_name = FIRMWARE_AR9271;
1231
1232         ret = request_firmware_nowait(THIS_MODULE, true, hif_dev->fw_name,
1233                                       &hif_dev->udev->dev, GFP_KERNEL,
1234                                       hif_dev, ath9k_hif_usb_firmware_cb);
1235         if (ret) {
1236                 dev_err(&hif_dev->udev->dev,
1237                         "ath9k_htc: Async request for firmware %s failed\n",
1238                         hif_dev->fw_name);
1239                 goto err_fw_req;
1240         }
1241
1242         dev_info(&hif_dev->udev->dev, "ath9k_htc: Firmware %s requested\n",
1243                  hif_dev->fw_name);
1244
1245         return 0;
1246
1247 err_fw_req:
1248         usb_set_intfdata(interface, NULL);
1249         kfree(hif_dev);
1250         usb_put_dev(udev);
1251 err_alloc:
1252         return ret;
1253 }
1254
1255 static void ath9k_hif_usb_reboot(struct usb_device *udev)
1256 {
1257         u32 reboot_cmd = 0xffffffff;
1258         void *buf;
1259         int ret;
1260
1261         buf = kmemdup(&reboot_cmd, 4, GFP_KERNEL);
1262         if (!buf)
1263                 return;
1264
1265         ret = usb_bulk_msg(udev, usb_sndbulkpipe(udev, USB_REG_OUT_PIPE),
1266                            buf, 4, NULL, HZ);
1267         if (ret)
1268                 dev_err(&udev->dev, "ath9k_htc: USB reboot failed\n");
1269
1270         kfree(buf);
1271 }
1272
1273 static void ath9k_hif_usb_disconnect(struct usb_interface *interface)
1274 {
1275         struct usb_device *udev = interface_to_usbdev(interface);
1276         struct hif_device_usb *hif_dev = usb_get_intfdata(interface);
1277         bool unplugged = (udev->state == USB_STATE_NOTATTACHED) ? true : false;
1278
1279         if (!hif_dev)
1280                 return;
1281
1282         wait_for_completion(&hif_dev->fw_done);
1283
1284         if (hif_dev->flags & HIF_USB_READY) {
1285                 ath9k_htc_hw_deinit(hif_dev->htc_handle, unplugged);
1286                 ath9k_htc_hw_free(hif_dev->htc_handle);
1287                 ath9k_hif_usb_dev_deinit(hif_dev);
1288         }
1289
1290         usb_set_intfdata(interface, NULL);
1291
1292         if (!unplugged && (hif_dev->flags & HIF_USB_START))
1293                 ath9k_hif_usb_reboot(udev);
1294
1295         kfree(hif_dev);
1296         dev_info(&udev->dev, "ath9k_htc: USB layer deinitialized\n");
1297         usb_put_dev(udev);
1298 }
1299
1300 #ifdef CONFIG_PM
1301 static int ath9k_hif_usb_suspend(struct usb_interface *interface,
1302                                  pm_message_t message)
1303 {
1304         struct hif_device_usb *hif_dev = usb_get_intfdata(interface);
1305
1306         /*
1307          * The device has to be set to FULLSLEEP mode in case no
1308          * interface is up.
1309          */
1310         if (!(hif_dev->flags & HIF_USB_START))
1311                 ath9k_htc_suspend(hif_dev->htc_handle);
1312
1313         ath9k_hif_usb_dealloc_urbs(hif_dev);
1314
1315         return 0;
1316 }
1317
1318 static int ath9k_hif_usb_resume(struct usb_interface *interface)
1319 {
1320         struct hif_device_usb *hif_dev = usb_get_intfdata(interface);
1321         struct htc_target *htc_handle = hif_dev->htc_handle;
1322         int ret;
1323         const struct firmware *fw;
1324
1325         ret = ath9k_hif_usb_alloc_urbs(hif_dev);
1326         if (ret)
1327                 return ret;
1328
1329         if (hif_dev->flags & HIF_USB_READY) {
1330                 /* request cached firmware during suspend/resume cycle */
1331                 ret = request_firmware(&fw, hif_dev->fw_name,
1332                                        &hif_dev->udev->dev);
1333                 if (ret)
1334                         goto fail_resume;
1335
1336                 hif_dev->fw_data = fw->data;
1337                 hif_dev->fw_size = fw->size;
1338                 ret = ath9k_hif_usb_download_fw(hif_dev);
1339                 release_firmware(fw);
1340                 if (ret)
1341                         goto fail_resume;
1342         } else {
1343                 ath9k_hif_usb_dealloc_urbs(hif_dev);
1344                 return -EIO;
1345         }
1346
1347         mdelay(100);
1348
1349         ret = ath9k_htc_resume(htc_handle);
1350
1351         if (ret)
1352                 goto fail_resume;
1353
1354         return 0;
1355
1356 fail_resume:
1357         ath9k_hif_usb_dealloc_urbs(hif_dev);
1358
1359         return ret;
1360 }
1361 #endif
1362
1363 static struct usb_driver ath9k_hif_usb_driver = {
1364         .name = KBUILD_MODNAME,
1365         .probe = ath9k_hif_usb_probe,
1366         .disconnect = ath9k_hif_usb_disconnect,
1367 #ifdef CONFIG_PM
1368         .suspend = ath9k_hif_usb_suspend,
1369         .resume = ath9k_hif_usb_resume,
1370         .reset_resume = ath9k_hif_usb_resume,
1371 #endif
1372         .id_table = ath9k_hif_usb_ids,
1373         .soft_unbind = 1,
1374         .disable_hub_initiated_lpm = 1,
1375 };
1376
1377 int ath9k_hif_usb_init(void)
1378 {
1379         return usb_register(&ath9k_hif_usb_driver);
1380 }
1381
1382 void ath9k_hif_usb_exit(void)
1383 {
1384         usb_deregister(&ath9k_hif_usb_driver);
1385 }