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
  45         { USB_DEVICE(0x0cf3, 0x7015),
  46           .driver_info = AR9287_USB },  /* Atheros */
  47         { USB_DEVICE(0x1668, 0x1200),
  48           .driver_info = AR9287_USB },  /* Verizon */
  49
  50         { USB_DEVICE(0x0cf3, 0x7010),
  51           .driver_info = AR9280_USB },  /* Atheros */
  52         { USB_DEVICE(0x0846, 0x9018),
  53           .driver_info = AR9280_USB },  /* Netgear WNDA3200 */
  54         { USB_DEVICE(0x083A, 0xA704),
  55           .driver_info = AR9280_USB },  /* SMC Networks */
  56         { USB_DEVICE(0x0411, 0x017f),
  57           .driver_info = AR9280_USB },  /* Sony UWA-BR100 */
  58         { USB_DEVICE(0x0411, 0x0197),
  59           .driver_info = AR9280_USB },  /* Buffalo WLI-UV-AG300P */
  60         { USB_DEVICE(0x04da, 0x3904),
  61           .driver_info = AR9280_USB },
  62
  63         { USB_DEVICE(0x0cf3, 0x20ff),
  64           .driver_info = STORAGE_DEVICE },
  65
  66         { },
  67 };
  68
  69 MODULE_DEVICE_TABLE(usb, ath9k_hif_usb_ids);
  70
  71 static int __hif_usb_tx(struct hif_device_usb *hif_dev);
  72
  73 static void hif_usb_regout_cb(struct urb *urb)
  74 {
  75         struct cmd_buf *cmd = (struct cmd_buf *)urb->context;
  76
  77         switch (urb->status) {
  78         case 0:
  79                 break;
  80         case -ENOENT:
  81         case -ECONNRESET:
  82         case -ENODEV:
  83         case -ESHUTDOWN:
  84                 goto free;
  85         default:
  86                 break;
  87         }
  88
  89         if (cmd) {
  90                 ath9k_htc_txcompletion_cb(cmd->hif_dev->htc_handle,
  91                                           cmd->skb, true);
  92                 kfree(cmd);
  93         }
  94
  95         return;
  96 free:
  97         kfree_skb(cmd->skb);
  98         kfree(cmd);
  99 }
 100
 101 static int hif_usb_send_regout(struct hif_device_usb *hif_dev,
 102                                struct sk_buff *skb)
 103 {
 104         struct urb *urb;
 105         struct cmd_buf *cmd;
 106         int ret = 0;
 107
 108         urb = usb_alloc_urb(0, GFP_KERNEL);
 109         if (urb == NULL)
 110                 return -ENOMEM;
 111
 112         cmd = kzalloc(sizeof(*cmd), GFP_KERNEL);
 113         if (cmd == NULL) {
 114                 usb_free_urb(urb);
 115                 return -ENOMEM;
 116         }
 117
 118         cmd->skb = skb;
 119         cmd->hif_dev = hif_dev;
 120
 121         usb_fill_int_urb(urb, hif_dev->udev,
 122                          usb_sndintpipe(hif_dev->udev, USB_REG_OUT_PIPE),
 123                          skb->data, skb->len,
 124                          hif_usb_regout_cb, cmd, 1);
 125
 126         usb_anchor_urb(urb, &hif_dev->regout_submitted);
 127         ret = usb_submit_urb(urb, GFP_KERNEL);
 128         if (ret) {
 129                 usb_unanchor_urb(urb);
 130                 kfree(cmd);
 131         }
 132         usb_free_urb(urb);
 133
 134         return ret;
 135 }
 136
 137 static void hif_usb_mgmt_cb(struct urb *urb)
 138 {
 139         struct cmd_buf *cmd = (struct cmd_buf *)urb->context;
 140         struct hif_device_usb *hif_dev;
 141         bool txok = true;
 142
 143         if (!cmd || !cmd->skb || !cmd->hif_dev)
 144                 return;
 145
 146         hif_dev = cmd->hif_dev;
 147
 148         switch (urb->status) {
 149         case 0:
 150                 break;
 151         case -ENOENT:
 152         case -ECONNRESET:
 153         case -ENODEV:
 154         case -ESHUTDOWN:
 155                 txok = false;
 156
 157                 /*
 158                  * If the URBs are being flushed, no need to complete
 159                  * this packet.
 160                  */
 161                 spin_lock(&hif_dev->tx.tx_lock);
 162                 if (hif_dev->tx.flags & HIF_USB_TX_FLUSH) {
 163                         spin_unlock(&hif_dev->tx.tx_lock);
 164                         dev_kfree_skb_any(cmd->skb);
 165                         kfree(cmd);
 166                         return;
 167                 }
 168                 spin_unlock(&hif_dev->tx.tx_lock);
 169
 170                 break;
 171         default:
 172                 txok = false;
 173                 break;
 174         }
 175
 176         skb_pull(cmd->skb, 4);
 177         ath9k_htc_txcompletion_cb(cmd->hif_dev->htc_handle,
 178                                   cmd->skb, txok);
 179         kfree(cmd);
 180 }
 181
 182 static int hif_usb_send_mgmt(struct hif_device_usb *hif_dev,
 183                              struct sk_buff *skb)
 184 {
 185         struct urb *urb;
 186         struct cmd_buf *cmd;
 187         int ret = 0;
 188         __le16 *hdr;
 189
 190         urb = usb_alloc_urb(0, GFP_ATOMIC);
 191         if (urb == NULL)
 192                 return -ENOMEM;
 193
 194         cmd = kzalloc(sizeof(*cmd), GFP_ATOMIC);
 195         if (cmd == NULL) {
 196                 usb_free_urb(urb);
 197                 return -ENOMEM;
 198         }
 199
 200         cmd->skb = skb;
 201         cmd->hif_dev = hif_dev;
 202
 203         hdr = (__le16 *) skb_push(skb, 4);
 204         *hdr++ = cpu_to_le16(skb->len - 4);
 205         *hdr++ = cpu_to_le16(ATH_USB_TX_STREAM_MODE_TAG);
 206
 207         usb_fill_bulk_urb(urb, hif_dev->udev,
 208                          usb_sndbulkpipe(hif_dev->udev, USB_WLAN_TX_PIPE),
 209                          skb->data, skb->len,
 210                          hif_usb_mgmt_cb, cmd);
 211
 212         usb_anchor_urb(urb, &hif_dev->mgmt_submitted);
 213         ret = usb_submit_urb(urb, GFP_ATOMIC);
 214         if (ret) {
 215                 usb_unanchor_urb(urb);
 216                 kfree(cmd);
 217         }
 218         usb_free_urb(urb);
 219
 220         return ret;
 221 }
 222
 223 static inline void ath9k_skb_queue_purge(struct hif_device_usb *hif_dev,
 224                                          struct sk_buff_head *list)
 225 {
 226         struct sk_buff *skb;
 227
 228         while ((skb = __skb_dequeue(list)) != NULL) {
 229                 dev_kfree_skb_any(skb);
 230         }
 231 }
 232
 233 static inline void ath9k_skb_queue_complete(struct hif_device_usb *hif_dev,
 234                                             struct sk_buff_head *queue,
 235                                             bool txok)
 236 {
 237         struct sk_buff *skb;
 238
 239         while ((skb = __skb_dequeue(queue)) != NULL) {
 240 #ifdef CONFIG_ATH9K_HTC_DEBUGFS
 241                 int ln = skb->len;
 242 #endif
 243                 ath9k_htc_txcompletion_cb(hif_dev->htc_handle,
 244                                           skb, txok);
 245                 if (txok) {
 246                         TX_STAT_INC(skb_success);
 247                         TX_STAT_ADD(skb_success_bytes, ln);
 248                 }
 249                 else
 250                         TX_STAT_INC(skb_failed);
 251         }
 252 }
 253
 254 static void hif_usb_tx_cb(struct urb *urb)
 255 {
 256         struct tx_buf *tx_buf = (struct tx_buf *) urb->context;
 257         struct hif_device_usb *hif_dev;
 258         bool txok = true;
 259
 260         if (!tx_buf || !tx_buf->hif_dev)
 261                 return;
 262
 263         hif_dev = tx_buf->hif_dev;
 264
 265         switch (urb->status) {
 266         case 0:
 267                 break;
 268         case -ENOENT:
 269         case -ECONNRESET:
 270         case -ENODEV:
 271         case -ESHUTDOWN:
 272                 txok = false;
 273
 274                 /*
 275                  * If the URBs are being flushed, no need to add this
 276                  * URB to the free list.
 277                  */
 278                 spin_lock(&hif_dev->tx.tx_lock);
 279                 if (hif_dev->tx.flags & HIF_USB_TX_FLUSH) {
 280                         spin_unlock(&hif_dev->tx.tx_lock);
 281                         ath9k_skb_queue_purge(hif_dev, &tx_buf->skb_queue);
 282                         return;
 283                 }
 284                 spin_unlock(&hif_dev->tx.tx_lock);
 285
 286                 break;
 287         default:
 288                 txok = false;
 289                 break;
 290         }
 291
 292         ath9k_skb_queue_complete(hif_dev, &tx_buf->skb_queue, txok);
 293
 294         /* Re-initialize the SKB queue */
 295         tx_buf->len = tx_buf->offset = 0;
 296         __skb_queue_head_init(&tx_buf->skb_queue);
 297
 298         /* Add this TX buffer to the free list */
 299         spin_lock(&hif_dev->tx.tx_lock);
 300         list_move_tail(&tx_buf->list, &hif_dev->tx.tx_buf);
 301         hif_dev->tx.tx_buf_cnt++;
 302         if (!(hif_dev->tx.flags & HIF_USB_TX_STOP))
 303                 __hif_usb_tx(hif_dev); /* Check for pending SKBs */
 304         TX_STAT_INC(buf_completed);
 305         spin_unlock(&hif_dev->tx.tx_lock);
 306 }
 307
 308 /* TX lock has to be taken */
 309 static int __hif_usb_tx(struct hif_device_usb *hif_dev)
 310 {
 311         struct tx_buf *tx_buf = NULL;
 312         struct sk_buff *nskb = NULL;
 313         int ret = 0, i;
 314         u16 tx_skb_cnt = 0;
 315         u8 *buf;
 316         __le16 *hdr;
 317
 318         if (hif_dev->tx.tx_skb_cnt == 0)
 319                 return 0;
 320
 321         /* Check if a free TX buffer is available */
 322         if (list_empty(&hif_dev->tx.tx_buf))
 323                 return 0;
 324
 325         tx_buf = list_first_entry(&hif_dev->tx.tx_buf, struct tx_buf, list);
 326         list_move_tail(&tx_buf->list, &hif_dev->tx.tx_pending);
 327         hif_dev->tx.tx_buf_cnt--;
 328
 329         tx_skb_cnt = min_t(u16, hif_dev->tx.tx_skb_cnt, MAX_TX_AGGR_NUM);
 330
 331         for (i = 0; i < tx_skb_cnt; i++) {
 332                 nskb = __skb_dequeue(&hif_dev->tx.tx_skb_queue);
 333
 334                 /* Should never be NULL */
 335                 BUG_ON(!nskb);
 336
 337                 hif_dev->tx.tx_skb_cnt--;
 338
 339                 buf = tx_buf->buf;
 340                 buf += tx_buf->offset;
 341                 hdr = (__le16 *)buf;
 342                 *hdr++ = cpu_to_le16(nskb->len);
 343                 *hdr++ = cpu_to_le16(ATH_USB_TX_STREAM_MODE_TAG);
 344                 buf += 4;
 345                 memcpy(buf, nskb->data, nskb->len);
 346                 tx_buf->len = nskb->len + 4;
 347
 348                 if (i < (tx_skb_cnt - 1))
 349                         tx_buf->offset += (((tx_buf->len - 1) / 4) + 1) * 4;
 350
 351                 if (i == (tx_skb_cnt - 1))
 352                         tx_buf->len += tx_buf->offset;
 353
 354                 __skb_queue_tail(&tx_buf->skb_queue, nskb);
 355                 TX_STAT_INC(skb_queued);
 356         }
 357
 358         usb_fill_bulk_urb(tx_buf->urb, hif_dev->udev,
 359                           usb_sndbulkpipe(hif_dev->udev, USB_WLAN_TX_PIPE),
 360                           tx_buf->buf, tx_buf->len,
 361                           hif_usb_tx_cb, tx_buf);
 362
 363         ret = usb_submit_urb(tx_buf->urb, GFP_ATOMIC);
 364         if (ret) {
 365                 tx_buf->len = tx_buf->offset = 0;
 366                 ath9k_skb_queue_complete(hif_dev, &tx_buf->skb_queue, false);
 367                 __skb_queue_head_init(&tx_buf->skb_queue);
 368                 list_move_tail(&tx_buf->list, &hif_dev->tx.tx_buf);
 369                 hif_dev->tx.tx_buf_cnt++;
 370         }
 371
 372         if (!ret)
 373                 TX_STAT_INC(buf_queued);
 374
 375         return ret;
 376 }
 377
 378 static int hif_usb_send_tx(struct hif_device_usb *hif_dev, struct sk_buff *skb)
 379 {
 380         struct ath9k_htc_tx_ctl *tx_ctl;
 381         unsigned long flags;
 382         int ret = 0;
 383
 384         spin_lock_irqsave(&hif_dev->tx.tx_lock, flags);
 385
 386         if (hif_dev->tx.flags & HIF_USB_TX_STOP) {
 387                 spin_unlock_irqrestore(&hif_dev->tx.tx_lock, flags);
 388                 return -ENODEV;
 389         }
 390
 391         /* Check if the max queue count has been reached */
 392         if (hif_dev->tx.tx_skb_cnt > MAX_TX_BUF_NUM) {
 393                 spin_unlock_irqrestore(&hif_dev->tx.tx_lock, flags);
 394                 return -ENOMEM;
 395         }
 396
 397         spin_unlock_irqrestore(&hif_dev->tx.tx_lock, flags);
 398
 399         tx_ctl = HTC_SKB_CB(skb);
 400
 401         /* Mgmt/Beacon frames don't use the TX buffer pool */
 402         if ((tx_ctl->type == ATH9K_HTC_MGMT) ||
 403             (tx_ctl->type == ATH9K_HTC_BEACON)) {
 404                 ret = hif_usb_send_mgmt(hif_dev, skb);
 405         }
 406
 407         spin_lock_irqsave(&hif_dev->tx.tx_lock, flags);
 408
 409         if ((tx_ctl->type == ATH9K_HTC_NORMAL) ||
 410             (tx_ctl->type == ATH9K_HTC_AMPDU)) {
 411                 __skb_queue_tail(&hif_dev->tx.tx_skb_queue, skb);
 412                 hif_dev->tx.tx_skb_cnt++;
 413         }
 414
 415         /* Check if AMPDUs have to be sent immediately */
 416         if ((hif_dev->tx.tx_buf_cnt == MAX_TX_URB_NUM) &&
 417             (hif_dev->tx.tx_skb_cnt < 2)) {
 418                 __hif_usb_tx(hif_dev);
 419         }
 420
 421         spin_unlock_irqrestore(&hif_dev->tx.tx_lock, flags);
 422
 423         return ret;
 424 }
 425
 426 static void hif_usb_start(void *hif_handle)
 427 {
 428         struct hif_device_usb *hif_dev = (struct hif_device_usb *)hif_handle;
 429         unsigned long flags;
 430
 431         hif_dev->flags |= HIF_USB_START;
 432
 433         spin_lock_irqsave(&hif_dev->tx.tx_lock, flags);
 434         hif_dev->tx.flags &= ~HIF_USB_TX_STOP;
 435         spin_unlock_irqrestore(&hif_dev->tx.tx_lock, flags);
 436 }
 437
 438 static void hif_usb_stop(void *hif_handle)
 439 {
 440         struct hif_device_usb *hif_dev = (struct hif_device_usb *)hif_handle;
 441         struct tx_buf *tx_buf = NULL, *tx_buf_tmp = NULL;
 442         unsigned long flags;
 443
 444         spin_lock_irqsave(&hif_dev->tx.tx_lock, flags);
 445         ath9k_skb_queue_complete(hif_dev, &hif_dev->tx.tx_skb_queue, false);
 446         hif_dev->tx.tx_skb_cnt = 0;
 447         hif_dev->tx.flags |= HIF_USB_TX_STOP;
 448         spin_unlock_irqrestore(&hif_dev->tx.tx_lock, flags);
 449
 450         /* The pending URBs have to be canceled. */
 451         list_for_each_entry_safe(tx_buf, tx_buf_tmp,
 452                                  &hif_dev->tx.tx_pending, list) {
 453                 usb_kill_urb(tx_buf->urb);
 454         }
 455
 456         usb_kill_anchored_urbs(&hif_dev->mgmt_submitted);
 457 }
 458
 459 static int hif_usb_send(void *hif_handle, u8 pipe_id, struct sk_buff *skb)
 460 {
 461         struct hif_device_usb *hif_dev = (struct hif_device_usb *)hif_handle;
 462         int ret = 0;
 463
 464         switch (pipe_id) {
 465         case USB_WLAN_TX_PIPE:
 466                 ret = hif_usb_send_tx(hif_dev, skb);
 467                 break;
 468         case USB_REG_OUT_PIPE:
 469                 ret = hif_usb_send_regout(hif_dev, skb);
 470                 break;
 471         default:
 472                 dev_err(&hif_dev->udev->dev,
 473                         "ath9k_htc: Invalid TX pipe: %d\n", pipe_id);
 474                 ret = -EINVAL;
 475                 break;
 476         }
 477
 478         return ret;
 479 }
 480
 481 static inline bool check_index(struct sk_buff *skb, u8 idx)
 482 {
 483         struct ath9k_htc_tx_ctl *tx_ctl;
 484
 485         tx_ctl = HTC_SKB_CB(skb);
 486
 487         if ((tx_ctl->type == ATH9K_HTC_AMPDU) &&
 488             (tx_ctl->sta_idx == idx))
 489                 return true;
 490
 491         return false;
 492 }
 493
 494 static void hif_usb_sta_drain(void *hif_handle, u8 idx)
 495 {
 496         struct hif_device_usb *hif_dev = (struct hif_device_usb *)hif_handle;
 497         struct sk_buff *skb, *tmp;
 498         unsigned long flags;
 499
 500         spin_lock_irqsave(&hif_dev->tx.tx_lock, flags);
 501
 502         skb_queue_walk_safe(&hif_dev->tx.tx_skb_queue, skb, tmp) {
 503                 if (check_index(skb, idx)) {
 504                         __skb_unlink(skb, &hif_dev->tx.tx_skb_queue);
 505                         ath9k_htc_txcompletion_cb(hif_dev->htc_handle,
 506                                                   skb, false);
 507                         hif_dev->tx.tx_skb_cnt--;
 508                         TX_STAT_INC(skb_failed);
 509                 }
 510         }
 511
 512         spin_unlock_irqrestore(&hif_dev->tx.tx_lock, flags);
 513 }
 514
 515 static struct ath9k_htc_hif hif_usb = {
 516         .transport = ATH9K_HIF_USB,
 517         .name = "ath9k_hif_usb",
 518
 519         .control_ul_pipe = USB_REG_OUT_PIPE,
 520         .control_dl_pipe = USB_REG_IN_PIPE,
 521
 522         .start = hif_usb_start,
 523         .stop = hif_usb_stop,
 524         .sta_drain = hif_usb_sta_drain,
 525         .send = hif_usb_send,
 526 };
 527
 528 static void ath9k_hif_usb_rx_stream(struct hif_device_usb *hif_dev,
 529                                     struct sk_buff *skb)
 530 {
 531         struct sk_buff *nskb, *skb_pool[MAX_PKT_NUM_IN_TRANSFER];
 532         int index = 0, i = 0, len = skb->len;
 533         int rx_remain_len, rx_pkt_len;
 534         u16 pool_index = 0;
 535         u8 *ptr;
 536
 537         spin_lock(&hif_dev->rx_lock);
 538
 539         rx_remain_len = hif_dev->rx_remain_len;
 540         rx_pkt_len = hif_dev->rx_transfer_len;
 541
 542         if (rx_remain_len != 0) {
 543                 struct sk_buff *remain_skb = hif_dev->remain_skb;
 544
 545                 if (remain_skb) {
 546                         ptr = (u8 *) remain_skb->data;
 547
 548                         index = rx_remain_len;
 549                         rx_remain_len -= hif_dev->rx_pad_len;
 550                         ptr += rx_pkt_len;
 551
 552                         memcpy(ptr, skb->data, rx_remain_len);
 553
 554                         rx_pkt_len += rx_remain_len;
 555                         hif_dev->rx_remain_len = 0;
 556                         skb_put(remain_skb, rx_pkt_len);
 557
 558                         skb_pool[pool_index++] = remain_skb;
 559
 560                 } else {
 561                         index = rx_remain_len;
 562                 }
 563         }
 564
 565         spin_unlock(&hif_dev->rx_lock);
 566
 567         while (index < len) {
 568                 u16 pkt_len;
 569                 u16 pkt_tag;
 570                 u16 pad_len;
 571                 int chk_idx;
 572
 573                 ptr = (u8 *) skb->data;
 574
 575                 pkt_len = get_unaligned_le16(ptr + index);
 576                 pkt_tag = get_unaligned_le16(ptr + index + 2);
 577
 578                 if (pkt_tag != ATH_USB_RX_STREAM_MODE_TAG) {
 579                         RX_STAT_INC(skb_dropped);
 580                         return;
 581                 }
 582
 583                 pad_len = 4 - (pkt_len & 0x3);
 584                 if (pad_len == 4)
 585                         pad_len = 0;
 586
 587                 chk_idx = index;
 588                 index = index + 4 + pkt_len + pad_len;
 589
 590                 if (index > MAX_RX_BUF_SIZE) {
 591                         spin_lock(&hif_dev->rx_lock);
 592                         hif_dev->rx_remain_len = index - MAX_RX_BUF_SIZE;
 593                         hif_dev->rx_transfer_len =
 594                                 MAX_RX_BUF_SIZE - chk_idx - 4;
 595                         hif_dev->rx_pad_len = pad_len;
 596
 597                         nskb = __dev_alloc_skb(pkt_len + 32, GFP_ATOMIC);
 598                         if (!nskb) {
 599                                 dev_err(&hif_dev->udev->dev,
 600                                         "ath9k_htc: RX memory allocation error\n");
 601                                 spin_unlock(&hif_dev->rx_lock);
 602                                 goto err;
 603                         }
 604                         skb_reserve(nskb, 32);
 605                         RX_STAT_INC(skb_allocated);
 606
 607                         memcpy(nskb->data, &(skb->data[chk_idx+4]),
 608                                hif_dev->rx_transfer_len);
 609
 610                         /* Record the buffer pointer */
 611                         hif_dev->remain_skb = nskb;
 612                         spin_unlock(&hif_dev->rx_lock);
 613                 } else {
 614                         nskb = __dev_alloc_skb(pkt_len + 32, GFP_ATOMIC);
 615                         if (!nskb) {
 616                                 dev_err(&hif_dev->udev->dev,
 617                                         "ath9k_htc: RX memory allocation error\n");
 618                                 goto err;
 619                         }
 620                         skb_reserve(nskb, 32);
 621                         RX_STAT_INC(skb_allocated);
 622
 623                         memcpy(nskb->data, &(skb->data[chk_idx+4]), pkt_len);
 624                         skb_put(nskb, pkt_len);
 625                         skb_pool[pool_index++] = nskb;
 626                 }
 627         }
 628
 629 err:
 630         for (i = 0; i < pool_index; i++) {
 631                 RX_STAT_ADD(skb_completed_bytes, skb_pool[i]->len);
 632                 ath9k_htc_rx_msg(hif_dev->htc_handle, skb_pool[i],
 633                                  skb_pool[i]->len, USB_WLAN_RX_PIPE);
 634                 RX_STAT_INC(skb_completed);
 635         }
 636 }
 637
 638 static void ath9k_hif_usb_rx_cb(struct urb *urb)
 639 {
 640         struct sk_buff *skb = (struct sk_buff *) urb->context;
 641         struct hif_device_usb *hif_dev =
 642                 usb_get_intfdata(usb_ifnum_to_if(urb->dev, 0));
 643         int ret;
 644
 645         if (!skb)
 646                 return;
 647
 648         if (!hif_dev)
 649                 goto free;
 650
 651         switch (urb->status) {
 652         case 0:
 653                 break;
 654         case -ENOENT:
 655         case -ECONNRESET:
 656         case -ENODEV:
 657         case -ESHUTDOWN:
 658                 goto free;
 659         default:
 660                 goto resubmit;
 661         }
 662
 663         if (likely(urb->actual_length != 0)) {
 664                 skb_put(skb, urb->actual_length);
 665                 ath9k_hif_usb_rx_stream(hif_dev, skb);
 666         }
 667
 668 resubmit:
 669         skb_reset_tail_pointer(skb);
 670         skb_trim(skb, 0);
 671
 672         usb_anchor_urb(urb, &hif_dev->rx_submitted);
 673         ret = usb_submit_urb(urb, GFP_ATOMIC);
 674         if (ret) {
 675                 usb_unanchor_urb(urb);
 676                 goto free;
 677         }
 678
 679         return;
 680 free:
 681         kfree_skb(skb);
 682 }
 683
 684 static void ath9k_hif_usb_reg_in_cb(struct urb *urb)
 685 {
 686         struct sk_buff *skb = (struct sk_buff *) urb->context;
 687         struct sk_buff *nskb;
 688         struct hif_device_usb *hif_dev =
 689                 usb_get_intfdata(usb_ifnum_to_if(urb->dev, 0));
 690         int ret;
 691
 692         if (!skb)
 693                 return;
 694
 695         if (!hif_dev)
 696                 goto free;
 697
 698         switch (urb->status) {
 699         case 0:
 700                 break;
 701         case -ENOENT:
 702         case -ECONNRESET:
 703         case -ENODEV:
 704         case -ESHUTDOWN:
 705                 goto free;
 706         default:
 707                 skb_reset_tail_pointer(skb);
 708                 skb_trim(skb, 0);
 709
 710                 goto resubmit;
 711         }
 712
 713         if (likely(urb->actual_length != 0)) {
 714                 skb_put(skb, urb->actual_length);
 715
 716                 /* Process the command first */
 717                 ath9k_htc_rx_msg(hif_dev->htc_handle, skb,
 718                                  skb->len, USB_REG_IN_PIPE);
 719
 720
 721                 nskb = alloc_skb(MAX_REG_IN_BUF_SIZE, GFP_ATOMIC);
 722                 if (!nskb) {
 723                         dev_err(&hif_dev->udev->dev,
 724                                 "ath9k_htc: REG_IN memory allocation failure\n");
 725                         urb->context = NULL;
 726                         return;
 727                 }
 728
 729                 usb_fill_int_urb(urb, hif_dev->udev,
 730                                  usb_rcvintpipe(hif_dev->udev,
 731                                                  USB_REG_IN_PIPE),
 732                                  nskb->data, MAX_REG_IN_BUF_SIZE,
 733                                  ath9k_hif_usb_reg_in_cb, nskb, 1);
 734         }
 735
 736 resubmit:
 737         usb_anchor_urb(urb, &hif_dev->reg_in_submitted);
 738         ret = usb_submit_urb(urb, GFP_ATOMIC);
 739         if (ret) {
 740                 usb_unanchor_urb(urb);
 741                 goto free;
 742         }
 743
 744         return;
 745 free:
 746         kfree_skb(skb);
 747         urb->context = NULL;
 748 }
 749
 750 static void ath9k_hif_usb_dealloc_tx_urbs(struct hif_device_usb *hif_dev)
 751 {
 752         struct tx_buf *tx_buf = NULL, *tx_buf_tmp = NULL;
 753         unsigned long flags;
 754
 755         list_for_each_entry_safe(tx_buf, tx_buf_tmp,
 756                                  &hif_dev->tx.tx_buf, list) {
 757                 usb_kill_urb(tx_buf->urb);
 758                 list_del(&tx_buf->list);
 759                 usb_free_urb(tx_buf->urb);
 760                 kfree(tx_buf->buf);
 761                 kfree(tx_buf);
 762         }
 763
 764         spin_lock_irqsave(&hif_dev->tx.tx_lock, flags);
 765         hif_dev->tx.flags |= HIF_USB_TX_FLUSH;
 766         spin_unlock_irqrestore(&hif_dev->tx.tx_lock, flags);
 767
 768         list_for_each_entry_safe(tx_buf, tx_buf_tmp,
 769                                  &hif_dev->tx.tx_pending, list) {
 770                 usb_kill_urb(tx_buf->urb);
 771                 list_del(&tx_buf->list);
 772                 usb_free_urb(tx_buf->urb);
 773                 kfree(tx_buf->buf);
 774                 kfree(tx_buf);
 775         }
 776
 777         usb_kill_anchored_urbs(&hif_dev->mgmt_submitted);
 778 }
 779
 780 static int ath9k_hif_usb_alloc_tx_urbs(struct hif_device_usb *hif_dev)
 781 {
 782         struct tx_buf *tx_buf;
 783         int i;
 784
 785         INIT_LIST_HEAD(&hif_dev->tx.tx_buf);
 786         INIT_LIST_HEAD(&hif_dev->tx.tx_pending);
 787         spin_lock_init(&hif_dev->tx.tx_lock);
 788         __skb_queue_head_init(&hif_dev->tx.tx_skb_queue);
 789         init_usb_anchor(&hif_dev->mgmt_submitted);
 790
 791         for (i = 0; i < MAX_TX_URB_NUM; i++) {
 792                 tx_buf = kzalloc(sizeof(struct tx_buf), GFP_KERNEL);
 793                 if (!tx_buf)
 794                         goto err;
 795
 796                 tx_buf->buf = kzalloc(MAX_TX_BUF_SIZE, GFP_KERNEL);
 797                 if (!tx_buf->buf)
 798                         goto err;
 799
 800                 tx_buf->urb = usb_alloc_urb(0, GFP_KERNEL);
 801                 if (!tx_buf->urb)
 802                         goto err;
 803
 804                 tx_buf->hif_dev = hif_dev;
 805                 __skb_queue_head_init(&tx_buf->skb_queue);
 806
 807                 list_add_tail(&tx_buf->list, &hif_dev->tx.tx_buf);
 808         }
 809
 810         hif_dev->tx.tx_buf_cnt = MAX_TX_URB_NUM;
 811
 812         return 0;
 813 err:
 814         if (tx_buf) {
 815                 kfree(tx_buf->buf);
 816                 kfree(tx_buf);
 817         }
 818         ath9k_hif_usb_dealloc_tx_urbs(hif_dev);
 819         return -ENOMEM;
 820 }
 821
 822 static void ath9k_hif_usb_dealloc_rx_urbs(struct hif_device_usb *hif_dev)
 823 {
 824         usb_kill_anchored_urbs(&hif_dev->rx_submitted);
 825 }
 826
 827 static int ath9k_hif_usb_alloc_rx_urbs(struct hif_device_usb *hif_dev)
 828 {
 829         struct urb *urb = NULL;
 830         struct sk_buff *skb = NULL;
 831         int i, ret;
 832
 833         init_usb_anchor(&hif_dev->rx_submitted);
 834         spin_lock_init(&hif_dev->rx_lock);
 835
 836         for (i = 0; i < MAX_RX_URB_NUM; i++) {
 837
 838                 /* Allocate URB */
 839                 urb = usb_alloc_urb(0, GFP_KERNEL);
 840                 if (urb == NULL) {
 841                         ret = -ENOMEM;
 842                         goto err_urb;
 843                 }
 844
 845                 /* Allocate buffer */
 846                 skb = alloc_skb(MAX_RX_BUF_SIZE, GFP_KERNEL);
 847                 if (!skb) {
 848                         ret = -ENOMEM;
 849                         goto err_skb;
 850                 }
 851
 852                 usb_fill_bulk_urb(urb, hif_dev->udev,
 853                                   usb_rcvbulkpipe(hif_dev->udev,
 854                                                   USB_WLAN_RX_PIPE),
 855                                   skb->data, MAX_RX_BUF_SIZE,
 856                                   ath9k_hif_usb_rx_cb, skb);
 857
 858                 /* Anchor URB */
 859                 usb_anchor_urb(urb, &hif_dev->rx_submitted);
 860
 861                 /* Submit URB */
 862                 ret = usb_submit_urb(urb, GFP_KERNEL);
 863                 if (ret) {
 864                         usb_unanchor_urb(urb);
 865                         goto err_submit;
 866                 }
 867
 868                 /*
 869                  * Drop reference count.
 870                  * This ensures that the URB is freed when killing them.
 871                  */
 872                 usb_free_urb(urb);
 873         }
 874
 875         return 0;
 876
 877 err_submit:
 878         kfree_skb(skb);
 879 err_skb:
 880         usb_free_urb(urb);
 881 err_urb:
 882         ath9k_hif_usb_dealloc_rx_urbs(hif_dev);
 883         return ret;
 884 }
 885
 886 static void ath9k_hif_usb_dealloc_reg_in_urbs(struct hif_device_usb *hif_dev)
 887 {
 888         usb_kill_anchored_urbs(&hif_dev->reg_in_submitted);
 889 }
 890
 891 static int ath9k_hif_usb_alloc_reg_in_urbs(struct hif_device_usb *hif_dev)
 892 {
 893         struct urb *urb = NULL;
 894         struct sk_buff *skb = NULL;
 895         int i, ret;
 896
 897         init_usb_anchor(&hif_dev->reg_in_submitted);
 898
 899         for (i = 0; i < MAX_REG_IN_URB_NUM; i++) {
 900
 901                 /* Allocate URB */
 902                 urb = usb_alloc_urb(0, GFP_KERNEL);
 903                 if (urb == NULL) {
 904                         ret = -ENOMEM;
 905                         goto err_urb;
 906                 }
 907
 908                 /* Allocate buffer */
 909                 skb = alloc_skb(MAX_REG_IN_BUF_SIZE, GFP_KERNEL);
 910                 if (!skb) {
 911                         ret = -ENOMEM;
 912                         goto err_skb;
 913                 }
 914
 915                 usb_fill_int_urb(urb, hif_dev->udev,
 916                                   usb_rcvintpipe(hif_dev->udev,
 917                                                   USB_REG_IN_PIPE),
 918                                   skb->data, MAX_REG_IN_BUF_SIZE,
 919                                   ath9k_hif_usb_reg_in_cb, skb, 1);
 920
 921                 /* Anchor URB */
 922                 usb_anchor_urb(urb, &hif_dev->reg_in_submitted);
 923
 924                 /* Submit URB */
 925                 ret = usb_submit_urb(urb, GFP_KERNEL);
 926                 if (ret) {
 927                         usb_unanchor_urb(urb);
 928                         goto err_submit;
 929                 }
 930
 931                 /*
 932                  * Drop reference count.
 933                  * This ensures that the URB is freed when killing them.
 934                  */
 935                 usb_free_urb(urb);
 936         }
 937
 938         return 0;
 939
 940 err_submit:
 941         kfree_skb(skb);
 942 err_skb:
 943         usb_free_urb(urb);
 944 err_urb:
 945         ath9k_hif_usb_dealloc_reg_in_urbs(hif_dev);
 946         return ret;
 947 }
 948
 949 static int ath9k_hif_usb_alloc_urbs(struct hif_device_usb *hif_dev)
 950 {
 951         /* Register Write */
 952         init_usb_anchor(&hif_dev->regout_submitted);
 953
 954         /* TX */
 955         if (ath9k_hif_usb_alloc_tx_urbs(hif_dev) < 0)
 956                 goto err;
 957
 958         /* RX */
 959         if (ath9k_hif_usb_alloc_rx_urbs(hif_dev) < 0)
 960                 goto err_rx;
 961
 962         /* Register Read */
 963         if (ath9k_hif_usb_alloc_reg_in_urbs(hif_dev) < 0)
 964                 goto err_reg;
 965
 966         return 0;
 967 err_reg:
 968         ath9k_hif_usb_dealloc_rx_urbs(hif_dev);
 969 err_rx:
 970         ath9k_hif_usb_dealloc_tx_urbs(hif_dev);
 971 err:
 972         return -ENOMEM;
 973 }
 974
 975 static void ath9k_hif_usb_dealloc_urbs(struct hif_device_usb *hif_dev)
 976 {
 977         usb_kill_anchored_urbs(&hif_dev->regout_submitted);
 978         ath9k_hif_usb_dealloc_reg_in_urbs(hif_dev);
 979         ath9k_hif_usb_dealloc_tx_urbs(hif_dev);
 980         ath9k_hif_usb_dealloc_rx_urbs(hif_dev);
 981 }
 982
 983 static int ath9k_hif_usb_download_fw(struct hif_device_usb *hif_dev)
 984 {
 985         int transfer, err;
 986         const void *data = hif_dev->fw_data;
 987         size_t len = hif_dev->fw_size;
 988         u32 addr = AR9271_FIRMWARE;
 989         u8 *buf = kzalloc(4096, GFP_KERNEL);
 990         u32 firm_offset;
 991
 992         if (!buf)
 993                 return -ENOMEM;
 994
 995         while (len) {
 996                 transfer = min_t(size_t, len, 4096);
 997                 memcpy(buf, data, transfer);
 998
 999                 err = usb_control_msg(hif_dev->udev,
1000                                       usb_sndctrlpipe(hif_dev->udev, 0),
1001                                       FIRMWARE_DOWNLOAD, 0x40 | USB_DIR_OUT,
1002                                       addr >> 8, 0, buf, transfer, HZ);
1003                 if (err < 0) {
1004                         kfree(buf);
1005                         return err;
1006                 }
1007
1008                 len -= transfer;
1009                 data += transfer;
1010                 addr += transfer;
1011         }
1012         kfree(buf);
1013
1014         if (IS_AR7010_DEVICE(hif_dev->usb_device_id->driver_info))
1015                 firm_offset = AR7010_FIRMWARE_TEXT;
1016         else
1017                 firm_offset = AR9271_FIRMWARE_TEXT;
1018
1019         /*
1020          * Issue FW download complete command to firmware.
1021          */
1022         err = usb_control_msg(hif_dev->udev, usb_sndctrlpipe(hif_dev->udev, 0),
1023                               FIRMWARE_DOWNLOAD_COMP,
1024                               0x40 | USB_DIR_OUT,
1025                               firm_offset >> 8, 0, NULL, 0, HZ);
1026         if (err)
1027                 return -EIO;
1028
1029         dev_info(&hif_dev->udev->dev, "ath9k_htc: Transferred FW: %s, size: %ld\n",
1030                  hif_dev->fw_name, (unsigned long) hif_dev->fw_size);
1031
1032         return 0;
1033 }
1034
1035 static int ath9k_hif_usb_dev_init(struct hif_device_usb *hif_dev)
1036 {
1037         int ret;
1038
1039         ret = ath9k_hif_usb_download_fw(hif_dev);
1040         if (ret) {
1041                 dev_err(&hif_dev->udev->dev,
1042                         "ath9k_htc: Firmware - %s download failed\n",
1043                         hif_dev->fw_name);
1044                 return ret;
1045         }
1046
1047         /* Alloc URBs */
1048         ret = ath9k_hif_usb_alloc_urbs(hif_dev);
1049         if (ret) {
1050                 dev_err(&hif_dev->udev->dev,
1051                         "ath9k_htc: Unable to allocate URBs\n");
1052                 return ret;
1053         }
1054
1055         return 0;
1056 }
1057
1058 static void ath9k_hif_usb_dev_deinit(struct hif_device_usb *hif_dev)
1059 {
1060         ath9k_hif_usb_dealloc_urbs(hif_dev);
1061 }
1062
1063 /*
1064  * If initialization fails or the FW cannot be retrieved,
1065  * detach the device.
1066  */
1067 static void ath9k_hif_usb_firmware_fail(struct hif_device_usb *hif_dev)
1068 {
1069         struct device *dev = &hif_dev->udev->dev;
1070         struct device *parent = dev->parent;
1071
1072         complete_all(&hif_dev->fw_done);
1073
1074         if (parent)
1075                 device_lock(parent);
1076
1077         device_release_driver(dev);
1078
1079         if (parent)
1080                 device_unlock(parent);
1081 }
1082
1083 static void ath9k_hif_usb_firmware_cb(const struct firmware *fw, void *context)
1084 {
1085         struct hif_device_usb *hif_dev = context;
1086         int ret;
1087
1088         if (!fw) {
1089                 dev_err(&hif_dev->udev->dev,
1090                         "ath9k_htc: Failed to get firmware %s\n",
1091                         hif_dev->fw_name);
1092                 goto err_fw;
1093         }
1094
1095         hif_dev->htc_handle = ath9k_htc_hw_alloc(hif_dev, &hif_usb,
1096                                                  &hif_dev->udev->dev);
1097         if (hif_dev->htc_handle == NULL)
1098                 goto err_dev_alloc;
1099
1100         hif_dev->fw_data = fw->data;
1101         hif_dev->fw_size = fw->size;
1102
1103         /* Proceed with initialization */
1104
1105         ret = ath9k_hif_usb_dev_init(hif_dev);
1106         if (ret)
1107                 goto err_dev_init;
1108
1109         ret = ath9k_htc_hw_init(hif_dev->htc_handle,
1110                                 &hif_dev->interface->dev,
1111                                 hif_dev->usb_device_id->idProduct,
1112                                 hif_dev->udev->product,
1113                                 hif_dev->usb_device_id->driver_info);
1114         if (ret) {
1115                 ret = -EINVAL;
1116                 goto err_htc_hw_init;
1117         }
1118
1119         release_firmware(fw);
1120         hif_dev->flags |= HIF_USB_READY;
1121         complete_all(&hif_dev->fw_done);
1122
1123         return;
1124
1125 err_htc_hw_init:
1126         ath9k_hif_usb_dev_deinit(hif_dev);
1127 err_dev_init:
1128         ath9k_htc_hw_free(hif_dev->htc_handle);
1129 err_dev_alloc:
1130         release_firmware(fw);
1131 err_fw:
1132         ath9k_hif_usb_firmware_fail(hif_dev);
1133 }
1134
1135 /*
1136  * An exact copy of the function from zd1211rw.
1137  */
1138 static int send_eject_command(struct usb_interface *interface)
1139 {
1140         struct usb_device *udev = interface_to_usbdev(interface);
1141         struct usb_host_interface *iface_desc = &interface->altsetting[0];
1142         struct usb_endpoint_descriptor *endpoint;
1143         unsigned char *cmd;
1144         u8 bulk_out_ep;
1145         int r;
1146
1147         /* Find bulk out endpoint */
1148         for (r = 1; r >= 0; r--) {
1149                 endpoint = &iface_desc->endpoint[r].desc;
1150                 if (usb_endpoint_dir_out(endpoint) &&
1151                     usb_endpoint_xfer_bulk(endpoint)) {
1152                         bulk_out_ep = endpoint->bEndpointAddress;
1153                         break;
1154                 }
1155         }
1156         if (r == -1) {
1157                 dev_err(&udev->dev,
1158                         "ath9k_htc: Could not find bulk out endpoint\n");
1159                 return -ENODEV;
1160         }
1161
1162         cmd = kzalloc(31, GFP_KERNEL);
1163         if (cmd == NULL)
1164                 return -ENODEV;
1165
1166         /* USB bulk command block */
1167         cmd[0] = 0x55;  /* bulk command signature */
1168         cmd[1] = 0x53;  /* bulk command signature */
1169         cmd[2] = 0x42;  /* bulk command signature */
1170         cmd[3] = 0x43;  /* bulk command signature */
1171         cmd[14] = 6;    /* command length */
1172
1173         cmd[15] = 0x1b; /* SCSI command: START STOP UNIT */
1174         cmd[19] = 0x2;  /* eject disc */
1175
1176         dev_info(&udev->dev, "Ejecting storage device...\n");
1177         r = usb_bulk_msg(udev, usb_sndbulkpipe(udev, bulk_out_ep),
1178                 cmd, 31, NULL, 2000);
1179         kfree(cmd);
1180         if (r)
1181                 return r;
1182
1183         /* At this point, the device disconnects and reconnects with the real
1184          * ID numbers. */
1185
1186         usb_set_intfdata(interface, NULL);
1187         return 0;
1188 }
1189
1190 static int ath9k_hif_usb_probe(struct usb_interface *interface,
1191                                const struct usb_device_id *id)
1192 {
1193         struct usb_device *udev = interface_to_usbdev(interface);
1194         struct hif_device_usb *hif_dev;
1195         int ret = 0;
1196
1197         if (id->driver_info == STORAGE_DEVICE)
1198                 return send_eject_command(interface);
1199
1200         hif_dev = kzalloc(sizeof(struct hif_device_usb), GFP_KERNEL);
1201         if (!hif_dev) {
1202                 ret = -ENOMEM;
1203                 goto err_alloc;
1204         }
1205
1206         usb_get_dev(udev);
1207
1208         hif_dev->udev = udev;
1209         hif_dev->interface = interface;
1210         hif_dev->usb_device_id = id;
1211 #ifdef CONFIG_PM
1212         udev->reset_resume = 1;
1213 #endif
1214         usb_set_intfdata(interface, hif_dev);
1215
1216         init_completion(&hif_dev->fw_done);
1217
1218         /* Find out which firmware to load */
1219
1220         if (IS_AR7010_DEVICE(id->driver_info))
1221                 hif_dev->fw_name = FIRMWARE_AR7010_1_1;
1222         else
1223                 hif_dev->fw_name = FIRMWARE_AR9271;
1224
1225         ret = request_firmware_nowait(THIS_MODULE, true, hif_dev->fw_name,
1226                                       &hif_dev->udev->dev, GFP_KERNEL,
1227                                       hif_dev, ath9k_hif_usb_firmware_cb);
1228         if (ret) {
1229                 dev_err(&hif_dev->udev->dev,
1230                         "ath9k_htc: Async request for firmware %s failed\n",
1231                         hif_dev->fw_name);
1232                 goto err_fw_req;
1233         }
1234
1235         dev_info(&hif_dev->udev->dev, "ath9k_htc: Firmware %s requested\n",
1236                  hif_dev->fw_name);
1237
1238         return 0;
1239
1240 err_fw_req:
1241         usb_set_intfdata(interface, NULL);
1242         kfree(hif_dev);
1243         usb_put_dev(udev);
1244 err_alloc:
1245         return ret;
1246 }
1247
1248 static void ath9k_hif_usb_reboot(struct usb_device *udev)
1249 {
1250         u32 reboot_cmd = 0xffffffff;
1251         void *buf;
1252         int ret;
1253
1254         buf = kmemdup(&reboot_cmd, 4, GFP_KERNEL);
1255         if (!buf)
1256                 return;
1257
1258         ret = usb_interrupt_msg(udev, usb_sndintpipe(udev, USB_REG_OUT_PIPE),
1259                            buf, 4, NULL, HZ);
1260         if (ret)
1261                 dev_err(&udev->dev, "ath9k_htc: USB reboot failed\n");
1262
1263         kfree(buf);
1264 }
1265
1266 static void ath9k_hif_usb_disconnect(struct usb_interface *interface)
1267 {
1268         struct usb_device *udev = interface_to_usbdev(interface);
1269         struct hif_device_usb *hif_dev = usb_get_intfdata(interface);
1270         bool unplugged = (udev->state == USB_STATE_NOTATTACHED) ? true : false;
1271
1272         if (!hif_dev)
1273                 return;
1274
1275         wait_for_completion(&hif_dev->fw_done);
1276
1277         if (hif_dev->flags & HIF_USB_READY) {
1278                 ath9k_htc_hw_deinit(hif_dev->htc_handle, unplugged);
1279                 ath9k_htc_hw_free(hif_dev->htc_handle);
1280                 ath9k_hif_usb_dev_deinit(hif_dev);
1281         }
1282
1283         usb_set_intfdata(interface, NULL);
1284
1285         /* If firmware was loaded we should drop it
1286          * go back to first stage bootloader. */
1287         if (!unplugged && (hif_dev->flags & HIF_USB_READY))
1288                 ath9k_hif_usb_reboot(udev);
1289
1290         kfree(hif_dev);
1291         dev_info(&udev->dev, "ath9k_htc: USB layer deinitialized\n");
1292         usb_put_dev(udev);
1293 }
1294
1295 #ifdef CONFIG_PM
1296 static int ath9k_hif_usb_suspend(struct usb_interface *interface,
1297                                  pm_message_t message)
1298 {
1299         struct hif_device_usb *hif_dev = usb_get_intfdata(interface);
1300
1301         /*
1302          * The device has to be set to FULLSLEEP mode in case no
1303          * interface is up.
1304          */
1305         if (!(hif_dev->flags & HIF_USB_START))
1306                 ath9k_htc_suspend(hif_dev->htc_handle);
1307
1308         wait_for_completion(&hif_dev->fw_done);
1309
1310         if (hif_dev->flags & HIF_USB_READY)
1311                 ath9k_hif_usb_dealloc_urbs(hif_dev);
1312
1313         return 0;
1314 }
1315
1316 static int ath9k_hif_usb_resume(struct usb_interface *interface)
1317 {
1318         struct hif_device_usb *hif_dev = usb_get_intfdata(interface);
1319         struct htc_target *htc_handle = hif_dev->htc_handle;
1320         int ret;
1321         const struct firmware *fw;
1322
1323         ret = ath9k_hif_usb_alloc_urbs(hif_dev);
1324         if (ret)
1325                 return ret;
1326
1327         if (hif_dev->flags & HIF_USB_READY) {
1328                 /* request cached firmware during suspend/resume cycle */
1329                 ret = request_firmware(&fw, hif_dev->fw_name,
1330                                        &hif_dev->udev->dev);
1331                 if (ret)
1332                         goto fail_resume;
1333
1334                 hif_dev->fw_data = fw->data;
1335                 hif_dev->fw_size = fw->size;
1336                 ret = ath9k_hif_usb_download_fw(hif_dev);
1337                 release_firmware(fw);
1338                 if (ret)
1339                         goto fail_resume;
1340         } else {
1341                 ath9k_hif_usb_dealloc_urbs(hif_dev);
1342                 return -EIO;
1343         }
1344
1345         mdelay(100);
1346
1347         ret = ath9k_htc_resume(htc_handle);
1348
1349         if (ret)
1350                 goto fail_resume;
1351
1352         return 0;
1353
1354 fail_resume:
1355         ath9k_hif_usb_dealloc_urbs(hif_dev);
1356
1357         return ret;
1358 }
1359 #endif
1360
1361 static struct usb_driver ath9k_hif_usb_driver = {
1362         .name = KBUILD_MODNAME,
1363         .probe = ath9k_hif_usb_probe,
1364         .disconnect = ath9k_hif_usb_disconnect,
1365 #ifdef CONFIG_PM
1366         .suspend = ath9k_hif_usb_suspend,
1367         .resume = ath9k_hif_usb_resume,
1368         .reset_resume = ath9k_hif_usb_resume,
1369 #endif
1370         .id_table = ath9k_hif_usb_ids,
1371         .soft_unbind = 1,
1372         .disable_hub_initiated_lpm = 1,
1373 };
1374
1375 int ath9k_hif_usb_init(void)
1376 {
1377         return usb_register(&ath9k_hif_usb_driver);
1378 }
1379
1380 void ath9k_hif_usb_exit(void)
1381 {
1382         usb_deregister(&ath9k_hif_usb_driver);
1383 }