drivers/net/wireless/ath/ath9k/hif_usb.c

   1 /*
   2  * Copyright (c) 2010-2011 Atheros Communications Inc.
   3  *
   4  * Permission to use, copy, modify, and/or distribute this software for any
   5  * purpose with or without fee is hereby granted, provided that the above
   6  * copyright notice and this permission notice appear in all copies.
   7  *
   8  * THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL WARRANTIES
   9  * WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF
  10  * MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR
  11  * ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES
  12  * WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN
  13  * ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF
  14  * OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
  15  */
  16
  17 #include <asm/unaligned.h>
  18 #include "htc.h"
  19
  20 MODULE_FIRMWARE(HTC_7010_MODULE_FW);
  21 MODULE_FIRMWARE(HTC_9271_MODULE_FW);
  22
  23 static struct usb_device_id ath9k_hif_usb_ids[] = {
  24         { USB_DEVICE(0x0cf3, 0x9271) }, /* Atheros */
  25         { USB_DEVICE(0x0cf3, 0x1006) }, /* Atheros */
  26         { USB_DEVICE(0x0846, 0x9030) }, /* Netgear N150 */
  27         { USB_DEVICE(0x07D1, 0x3A10) }, /* Dlink Wireless 150 */
  28         { USB_DEVICE(0x13D3, 0x3327) }, /* Azurewave */
  29         { USB_DEVICE(0x13D3, 0x3328) }, /* Azurewave */
  30         { USB_DEVICE(0x13D3, 0x3346) }, /* IMC Networks */
  31         { USB_DEVICE(0x13D3, 0x3348) }, /* Azurewave */
  32         { USB_DEVICE(0x13D3, 0x3349) }, /* Azurewave */
  33         { USB_DEVICE(0x13D3, 0x3350) }, /* Azurewave */
  34         { USB_DEVICE(0x04CA, 0x4605) }, /* Liteon */
  35         { USB_DEVICE(0x040D, 0x3801) }, /* VIA */
  36         { USB_DEVICE(0x0cf3, 0xb003) }, /* Ubiquiti WifiStation Ext */
  37         { USB_DEVICE(0x0cf3, 0xb002) }, /* Ubiquiti WifiStation */
  38         { USB_DEVICE(0x057c, 0x8403) }, /* AVM FRITZ!WLAN 11N v2 USB */
  39         { USB_DEVICE(0x0471, 0x209e) }, /* Philips (or NXP) PTA01 */
  40         { USB_DEVICE(0x1eda, 0x2315) }, /* AirTies */
  41
  42         { USB_DEVICE(0x0cf3, 0x7015),
  43           .driver_info = AR9287_USB },  /* Atheros */
  44         { USB_DEVICE(0x1668, 0x1200),
  45           .driver_info = AR9287_USB },  /* Verizon */
  46
  47         { USB_DEVICE(0x0cf3, 0x7010),
  48           .driver_info = AR9280_USB },  /* Atheros */
  49         { USB_DEVICE(0x0846, 0x9018),
  50           .driver_info = AR9280_USB },  /* Netgear WNDA3200 */
  51         { USB_DEVICE(0x083A, 0xA704),
  52           .driver_info = AR9280_USB },  /* SMC Networks */
  53         { USB_DEVICE(0x0411, 0x017f),
  54           .driver_info = AR9280_USB },  /* Sony UWA-BR100 */
  55         { USB_DEVICE(0x0411, 0x0197),
  56           .driver_info = AR9280_USB },  /* Buffalo WLI-UV-AG300P */
  57         { USB_DEVICE(0x04da, 0x3904),
  58           .driver_info = AR9280_USB },
  59         { USB_DEVICE(0x0930, 0x0a08),
  60           .driver_info = AR9280_USB },  /* Toshiba WLM-20U2 and GN-1080 */
  61
  62         { USB_DEVICE(0x0cf3, 0x20ff),
  63           .driver_info = STORAGE_DEVICE },
  64
  65         { },
  66 };
  67
  68 MODULE_DEVICE_TABLE(usb, ath9k_hif_usb_ids);
  69
  70 static int __hif_usb_tx(struct hif_device_usb *hif_dev);
  71
  72 static void hif_usb_regout_cb(struct urb *urb)
  73 {
  74         struct cmd_buf *cmd = (struct cmd_buf *)urb->context;
  75
  76         switch (urb->status) {
  77         case 0:
  78                 break;
  79         case -ENOENT:
  80         case -ECONNRESET:
  81         case -ENODEV:
  82         case -ESHUTDOWN:
  83                 goto free;
  84         default:
  85                 break;
  86         }
  87
  88         if (cmd) {
  89                 ath9k_htc_txcompletion_cb(cmd->hif_dev->htc_handle,
  90                                           cmd->skb, true);
  91                 kfree(cmd);
  92         }
  93
  94         return;
  95 free:
  96         kfree_skb(cmd->skb);
  97         kfree(cmd);
  98 }
  99
 100 static int hif_usb_send_regout(struct hif_device_usb *hif_dev,
 101                                struct sk_buff *skb)
 102 {
 103         struct urb *urb;
 104         struct cmd_buf *cmd;
 105         int ret = 0;
 106
 107         urb = usb_alloc_urb(0, GFP_KERNEL);
 108         if (urb == NULL)
 109                 return -ENOMEM;
 110
 111         cmd = kzalloc(sizeof(*cmd), GFP_KERNEL);
 112         if (cmd == NULL) {
 113                 usb_free_urb(urb);
 114                 return -ENOMEM;
 115         }
 116
 117         cmd->skb = skb;
 118         cmd->hif_dev = hif_dev;
 119
 120         usb_fill_int_urb(urb, hif_dev->udev,
 121                          usb_sndintpipe(hif_dev->udev, USB_REG_OUT_PIPE),
 122                          skb->data, skb->len,
 123                          hif_usb_regout_cb, cmd, 1);
 124
 125         usb_anchor_urb(urb, &hif_dev->regout_submitted);
 126         ret = usb_submit_urb(urb, GFP_KERNEL);
 127         if (ret) {
 128                 usb_unanchor_urb(urb);
 129                 kfree(cmd);
 130         }
 131         usb_free_urb(urb);
 132
 133         return ret;
 134 }
 135
 136 static void hif_usb_mgmt_cb(struct urb *urb)
 137 {
 138         struct cmd_buf *cmd = (struct cmd_buf *)urb->context;
 139         struct hif_device_usb *hif_dev;
 140         bool txok = true;
 141
 142         if (!cmd || !cmd->skb || !cmd->hif_dev)
 143                 return;
 144
 145         hif_dev = cmd->hif_dev;
 146
 147         switch (urb->status) {
 148         case 0:
 149                 break;
 150         case -ENOENT:
 151         case -ECONNRESET:
 152         case -ENODEV:
 153         case -ESHUTDOWN:
 154                 txok = false;
 155
 156                 /*
 157                  * If the URBs are being flushed, no need to complete
 158                  * this packet.
 159                  */
 160                 spin_lock(&hif_dev->tx.tx_lock);
 161                 if (hif_dev->tx.flags & HIF_USB_TX_FLUSH) {
 162                         spin_unlock(&hif_dev->tx.tx_lock);
 163                         dev_kfree_skb_any(cmd->skb);
 164                         kfree(cmd);
 165                         return;
 166                 }
 167                 spin_unlock(&hif_dev->tx.tx_lock);
 168
 169                 break;
 170         default:
 171                 txok = false;
 172                 break;
 173         }
 174
 175         skb_pull(cmd->skb, 4);
 176         ath9k_htc_txcompletion_cb(cmd->hif_dev->htc_handle,
 177                                   cmd->skb, txok);
 178         kfree(cmd);
 179 }
 180
 181 static int hif_usb_send_mgmt(struct hif_device_usb *hif_dev,
 182                              struct sk_buff *skb)
 183 {
 184         struct urb *urb;
 185         struct cmd_buf *cmd;
 186         int ret = 0;
 187         __le16 *hdr;
 188
 189         urb = usb_alloc_urb(0, GFP_ATOMIC);
 190         if (urb == NULL)
 191                 return -ENOMEM;
 192
 193         cmd = kzalloc(sizeof(*cmd), GFP_ATOMIC);
 194         if (cmd == NULL) {
 195                 usb_free_urb(urb);
 196                 return -ENOMEM;
 197         }
 198
 199         cmd->skb = skb;
 200         cmd->hif_dev = hif_dev;
 201
 202         hdr = (__le16 *) skb_push(skb, 4);
 203         *hdr++ = cpu_to_le16(skb->len - 4);
 204         *hdr++ = cpu_to_le16(ATH_USB_TX_STREAM_MODE_TAG);
 205
 206         usb_fill_bulk_urb(urb, hif_dev->udev,
 207                          usb_sndbulkpipe(hif_dev->udev, USB_WLAN_TX_PIPE),
 208                          skb->data, skb->len,
 209                          hif_usb_mgmt_cb, cmd);
 210
 211         usb_anchor_urb(urb, &hif_dev->mgmt_submitted);
 212         ret = usb_submit_urb(urb, GFP_ATOMIC);
 213         if (ret) {
 214                 usb_unanchor_urb(urb);
 215                 kfree(cmd);
 216         }
 217         usb_free_urb(urb);
 218
 219         return ret;
 220 }
 221
 222 static inline void ath9k_skb_queue_purge(struct hif_device_usb *hif_dev,
 223                                          struct sk_buff_head *list)
 224 {
 225         struct sk_buff *skb;
 226
 227         while ((skb = __skb_dequeue(list)) != NULL) {
 228                 dev_kfree_skb_any(skb);
 229         }
 230 }
 231
 232 static inline void ath9k_skb_queue_complete(struct hif_device_usb *hif_dev,
 233                                             struct sk_buff_head *queue,
 234                                             bool txok)
 235 {
 236         struct sk_buff *skb;
 237
 238         while ((skb = __skb_dequeue(queue)) != NULL) {
 239 #ifdef CONFIG_ATH9K_HTC_DEBUGFS
 240                 int ln = skb->len;
 241 #endif
 242                 ath9k_htc_txcompletion_cb(hif_dev->htc_handle,
 243                                           skb, txok);
 244                 if (txok) {
 245                         TX_STAT_INC(skb_success);
 246                         TX_STAT_ADD(skb_success_bytes, ln);
 247                 }
 248                 else
 249                         TX_STAT_INC(skb_failed);
 250         }
 251 }
 252
 253 static void hif_usb_tx_cb(struct urb *urb)
 254 {
 255         struct tx_buf *tx_buf = (struct tx_buf *) urb->context;
 256         struct hif_device_usb *hif_dev;
 257         bool txok = true;
 258
 259         if (!tx_buf || !tx_buf->hif_dev)
 260                 return;
 261
 262         hif_dev = tx_buf->hif_dev;
 263
 264         switch (urb->status) {
 265         case 0:
 266                 break;
 267         case -ENOENT:
 268         case -ECONNRESET:
 269         case -ENODEV:
 270         case -ESHUTDOWN:
 271                 txok = false;
 272
 273                 /*
 274                  * If the URBs are being flushed, no need to add this
 275                  * URB to the free list.
 276                  */
 277                 spin_lock(&hif_dev->tx.tx_lock);
 278                 if (hif_dev->tx.flags & HIF_USB_TX_FLUSH) {
 279                         spin_unlock(&hif_dev->tx.tx_lock);
 280                         ath9k_skb_queue_purge(hif_dev, &tx_buf->skb_queue);
 281                         return;
 282                 }
 283                 spin_unlock(&hif_dev->tx.tx_lock);
 284
 285                 break;
 286         default:
 287                 txok = false;
 288                 break;
 289         }
 290
 291         ath9k_skb_queue_complete(hif_dev, &tx_buf->skb_queue, txok);
 292
 293         /* Re-initialize the SKB queue */
 294         tx_buf->len = tx_buf->offset = 0;
 295         __skb_queue_head_init(&tx_buf->skb_queue);
 296
 297         /* Add this TX buffer to the free list */
 298         spin_lock(&hif_dev->tx.tx_lock);
 299         list_move_tail(&tx_buf->list, &hif_dev->tx.tx_buf);
 300         hif_dev->tx.tx_buf_cnt++;
 301         if (!(hif_dev->tx.flags & HIF_USB_TX_STOP))
 302                 __hif_usb_tx(hif_dev); /* Check for pending SKBs */
 303         TX_STAT_INC(buf_completed);
 304         spin_unlock(&hif_dev->tx.tx_lock);
 305 }
 306
 307 /* TX lock has to be taken */
 308 static int __hif_usb_tx(struct hif_device_usb *hif_dev)
 309 {
 310         struct tx_buf *tx_buf = NULL;
 311         struct sk_buff *nskb = NULL;
 312         int ret = 0, i;
 313         u16 tx_skb_cnt = 0;
 314         u8 *buf;
 315         __le16 *hdr;
 316
 317         if (hif_dev->tx.tx_skb_cnt == 0)
 318                 return 0;
 319
 320         /* Check if a free TX buffer is available */
 321         if (list_empty(&hif_dev->tx.tx_buf))
 322                 return 0;
 323
 324         tx_buf = list_first_entry(&hif_dev->tx.tx_buf, struct tx_buf, list);
 325         list_move_tail(&tx_buf->list, &hif_dev->tx.tx_pending);
 326         hif_dev->tx.tx_buf_cnt--;
 327
 328         tx_skb_cnt = min_t(u16, hif_dev->tx.tx_skb_cnt, MAX_TX_AGGR_NUM);
 329
 330         for (i = 0; i < tx_skb_cnt; i++) {
 331                 nskb = __skb_dequeue(&hif_dev->tx.tx_skb_queue);
 332
 333                 /* Should never be NULL */
 334                 BUG_ON(!nskb);
 335
 336                 hif_dev->tx.tx_skb_cnt--;
 337
 338                 buf = tx_buf->buf;
 339                 buf += tx_buf->offset;
 340                 hdr = (__le16 *)buf;
 341                 *hdr++ = cpu_to_le16(nskb->len);
 342                 *hdr++ = cpu_to_le16(ATH_USB_TX_STREAM_MODE_TAG);
 343                 buf += 4;
 344                 memcpy(buf, nskb->data, nskb->len);
 345                 tx_buf->len = nskb->len + 4;
 346
 347                 if (i < (tx_skb_cnt - 1))
 348                         tx_buf->offset += (((tx_buf->len - 1) / 4) + 1) * 4;
 349
 350                 if (i == (tx_skb_cnt - 1))
 351                         tx_buf->len += tx_buf->offset;
 352
 353                 __skb_queue_tail(&tx_buf->skb_queue, nskb);
 354                 TX_STAT_INC(skb_queued);
 355         }
 356
 357         usb_fill_bulk_urb(tx_buf->urb, hif_dev->udev,
 358                           usb_sndbulkpipe(hif_dev->udev, USB_WLAN_TX_PIPE),
 359                           tx_buf->buf, tx_buf->len,
 360                           hif_usb_tx_cb, tx_buf);
 361
 362         ret = usb_submit_urb(tx_buf->urb, GFP_ATOMIC);
 363         if (ret) {
 364                 tx_buf->len = tx_buf->offset = 0;
 365                 ath9k_skb_queue_complete(hif_dev, &tx_buf->skb_queue, false);
 366                 __skb_queue_head_init(&tx_buf->skb_queue);
 367                 list_move_tail(&tx_buf->list, &hif_dev->tx.tx_buf);
 368                 hif_dev->tx.tx_buf_cnt++;
 369         }
 370
 371         if (!ret)
 372                 TX_STAT_INC(buf_queued);
 373
 374         return ret;
 375 }
 376
 377 static int hif_usb_send_tx(struct hif_device_usb *hif_dev, struct sk_buff *skb)
 378 {
 379         struct ath9k_htc_tx_ctl *tx_ctl;
 380         unsigned long flags;
 381         int ret = 0;
 382
 383         spin_lock_irqsave(&hif_dev->tx.tx_lock, flags);
 384
 385         if (hif_dev->tx.flags & HIF_USB_TX_STOP) {
 386                 spin_unlock_irqrestore(&hif_dev->tx.tx_lock, flags);
 387                 return -ENODEV;
 388         }
 389
 390         /* Check if the max queue count has been reached */
 391         if (hif_dev->tx.tx_skb_cnt > MAX_TX_BUF_NUM) {
 392                 spin_unlock_irqrestore(&hif_dev->tx.tx_lock, flags);
 393                 return -ENOMEM;
 394         }
 395
 396         spin_unlock_irqrestore(&hif_dev->tx.tx_lock, flags);
 397
 398         tx_ctl = HTC_SKB_CB(skb);
 399
 400         /* Mgmt/Beacon frames don't use the TX buffer pool */
 401         if ((tx_ctl->type == ATH9K_HTC_MGMT) ||
 402             (tx_ctl->type == ATH9K_HTC_BEACON)) {
 403                 ret = hif_usb_send_mgmt(hif_dev, skb);
 404         }
 405
 406         spin_lock_irqsave(&hif_dev->tx.tx_lock, flags);
 407
 408         if ((tx_ctl->type == ATH9K_HTC_NORMAL) ||
 409             (tx_ctl->type == ATH9K_HTC_AMPDU)) {
 410                 __skb_queue_tail(&hif_dev->tx.tx_skb_queue, skb);
 411                 hif_dev->tx.tx_skb_cnt++;
 412         }
 413
 414         /* Check if AMPDUs have to be sent immediately */
 415         if ((hif_dev->tx.tx_buf_cnt == MAX_TX_URB_NUM) &&
 416             (hif_dev->tx.tx_skb_cnt < 2)) {
 417                 __hif_usb_tx(hif_dev);
 418         }
 419
 420         spin_unlock_irqrestore(&hif_dev->tx.tx_lock, flags);
 421
 422         return ret;
 423 }
 424
 425 static void hif_usb_start(void *hif_handle)
 426 {
 427         struct hif_device_usb *hif_dev = (struct hif_device_usb *)hif_handle;
 428         unsigned long flags;
 429
 430         hif_dev->flags |= HIF_USB_START;
 431
 432         spin_lock_irqsave(&hif_dev->tx.tx_lock, flags);
 433         hif_dev->tx.flags &= ~HIF_USB_TX_STOP;
 434         spin_unlock_irqrestore(&hif_dev->tx.tx_lock, flags);
 435 }
 436
 437 static void hif_usb_stop(void *hif_handle)
 438 {
 439         struct hif_device_usb *hif_dev = (struct hif_device_usb *)hif_handle;
 440         struct tx_buf *tx_buf = NULL, *tx_buf_tmp = NULL;
 441         unsigned long flags;
 442
 443         spin_lock_irqsave(&hif_dev->tx.tx_lock, flags);
 444         ath9k_skb_queue_complete(hif_dev, &hif_dev->tx.tx_skb_queue, false);
 445         hif_dev->tx.tx_skb_cnt = 0;
 446         hif_dev->tx.flags |= HIF_USB_TX_STOP;
 447         spin_unlock_irqrestore(&hif_dev->tx.tx_lock, flags);
 448
 449         /* The pending URBs have to be canceled. */
 450         spin_lock_irqsave(&hif_dev->tx.tx_lock, flags);
 451         list_for_each_entry_safe(tx_buf, tx_buf_tmp,
 452                                  &hif_dev->tx.tx_pending, list) {
 453                 usb_get_urb(tx_buf->urb);
 454                 spin_unlock_irqrestore(&hif_dev->tx.tx_lock, flags);
 455                 usb_kill_urb(tx_buf->urb);
 456                 list_del(&tx_buf->list);
 457                 usb_free_urb(tx_buf->urb);
 458                 kfree(tx_buf->buf);
 459                 kfree(tx_buf);
 460                 spin_lock_irqsave(&hif_dev->tx.tx_lock, flags);
 461         }
 462         spin_unlock_irqrestore(&hif_dev->tx.tx_lock, flags);
 463
 464         usb_kill_anchored_urbs(&hif_dev->mgmt_submitted);
 465 }
 466
 467 static int hif_usb_send(void *hif_handle, u8 pipe_id, struct sk_buff *skb)
 468 {
 469         struct hif_device_usb *hif_dev = (struct hif_device_usb *)hif_handle;
 470         int ret = 0;
 471
 472         switch (pipe_id) {
 473         case USB_WLAN_TX_PIPE:
 474                 ret = hif_usb_send_tx(hif_dev, skb);
 475                 break;
 476         case USB_REG_OUT_PIPE:
 477                 ret = hif_usb_send_regout(hif_dev, skb);
 478                 break;
 479         default:
 480                 dev_err(&hif_dev->udev->dev,
 481                         "ath9k_htc: Invalid TX pipe: %d\n", pipe_id);
 482                 ret = -EINVAL;
 483                 break;
 484         }
 485
 486         return ret;
 487 }
 488
 489 static inline bool check_index(struct sk_buff *skb, u8 idx)
 490 {
 491         struct ath9k_htc_tx_ctl *tx_ctl;
 492
 493         tx_ctl = HTC_SKB_CB(skb);
 494
 495         if ((tx_ctl->type == ATH9K_HTC_AMPDU) &&
 496             (tx_ctl->sta_idx == idx))
 497                 return true;
 498
 499         return false;
 500 }
 501
 502 static void hif_usb_sta_drain(void *hif_handle, u8 idx)
 503 {
 504         struct hif_device_usb *hif_dev = (struct hif_device_usb *)hif_handle;
 505         struct sk_buff *skb, *tmp;
 506         unsigned long flags;
 507
 508         spin_lock_irqsave(&hif_dev->tx.tx_lock, flags);
 509
 510         skb_queue_walk_safe(&hif_dev->tx.tx_skb_queue, skb, tmp) {
 511                 if (check_index(skb, idx)) {
 512                         __skb_unlink(skb, &hif_dev->tx.tx_skb_queue);
 513                         ath9k_htc_txcompletion_cb(hif_dev->htc_handle,
 514                                                   skb, false);
 515                         hif_dev->tx.tx_skb_cnt--;
 516                         TX_STAT_INC(skb_failed);
 517                 }
 518         }
 519
 520         spin_unlock_irqrestore(&hif_dev->tx.tx_lock, flags);
 521 }
 522
 523 static struct ath9k_htc_hif hif_usb = {
 524         .transport = ATH9K_HIF_USB,
 525         .name = "ath9k_hif_usb",
 526
 527         .control_ul_pipe = USB_REG_OUT_PIPE,
 528         .control_dl_pipe = USB_REG_IN_PIPE,
 529
 530         .start = hif_usb_start,
 531         .stop = hif_usb_stop,
 532         .sta_drain = hif_usb_sta_drain,
 533         .send = hif_usb_send,
 534 };
 535
 536 static void ath9k_hif_usb_rx_stream(struct hif_device_usb *hif_dev,
 537                                     struct sk_buff *skb)
 538 {
 539         struct sk_buff *nskb, *skb_pool[MAX_PKT_NUM_IN_TRANSFER];
 540         int index = 0, i, len = skb->len;
 541         int rx_remain_len, rx_pkt_len;
 542         u16 pool_index = 0;
 543         u8 *ptr;
 544
 545         spin_lock(&hif_dev->rx_lock);
 546
 547         rx_remain_len = hif_dev->rx_remain_len;
 548         rx_pkt_len = hif_dev->rx_transfer_len;
 549
 550         if (rx_remain_len != 0) {
 551                 struct sk_buff *remain_skb = hif_dev->remain_skb;
 552
 553                 if (remain_skb) {
 554                         ptr = (u8 *) remain_skb->data;
 555
 556                         index = rx_remain_len;
 557                         rx_remain_len -= hif_dev->rx_pad_len;
 558                         ptr += rx_pkt_len;
 559
 560                         memcpy(ptr, skb->data, rx_remain_len);
 561
 562                         rx_pkt_len += rx_remain_len;
 563                         hif_dev->rx_remain_len = 0;
 564                         skb_put(remain_skb, rx_pkt_len);
 565
 566                         skb_pool[pool_index++] = remain_skb;
 567
 568                 } else {
 569                         index = rx_remain_len;
 570                 }
 571         }
 572
 573         spin_unlock(&hif_dev->rx_lock);
 574
 575         while (index < len) {
 576                 u16 pkt_len;
 577                 u16 pkt_tag;
 578                 u16 pad_len;
 579                 int chk_idx;
 580
 581                 ptr = (u8 *) skb->data;
 582
 583                 pkt_len = get_unaligned_le16(ptr + index);
 584                 pkt_tag = get_unaligned_le16(ptr + index + 2);
 585
 586                 if (pkt_tag != ATH_USB_RX_STREAM_MODE_TAG) {
 587                         RX_STAT_INC(skb_dropped);
 588                         return;
 589                 }
 590
 591                 if (pkt_len > 2 * MAX_RX_BUF_SIZE) {
 592                         dev_err(&hif_dev->udev->dev,
 593                                 "ath9k_htc: invalid pkt_len (%x)\n", pkt_len);
 594                         RX_STAT_INC(skb_dropped);
 595                         return;
 596                 }
 597
 598                 pad_len = 4 - (pkt_len & 0x3);
 599                 if (pad_len == 4)
 600                         pad_len = 0;
 601
 602                 chk_idx = index;
 603                 index = index + 4 + pkt_len + pad_len;
 604
 605                 if (index > MAX_RX_BUF_SIZE) {
 606                         spin_lock(&hif_dev->rx_lock);
 607                         hif_dev->rx_remain_len = index - MAX_RX_BUF_SIZE;
 608                         hif_dev->rx_transfer_len =
 609                                 MAX_RX_BUF_SIZE - chk_idx - 4;
 610                         hif_dev->rx_pad_len = pad_len;
 611
 612                         nskb = __dev_alloc_skb(pkt_len + 32, GFP_ATOMIC);
 613                         if (!nskb) {
 614                                 dev_err(&hif_dev->udev->dev,
 615                                         "ath9k_htc: RX memory allocation error\n");
 616                                 spin_unlock(&hif_dev->rx_lock);
 617                                 goto err;
 618                         }
 619                         skb_reserve(nskb, 32);
 620                         RX_STAT_INC(skb_allocated);
 621
 622                         memcpy(nskb->data, &(skb->data[chk_idx+4]),
 623                                hif_dev->rx_transfer_len);
 624
 625                         /* Record the buffer pointer */
 626                         hif_dev->remain_skb = nskb;
 627                         spin_unlock(&hif_dev->rx_lock);
 628                 } else {
 629                         if (pool_index == MAX_PKT_NUM_IN_TRANSFER) {
 630                                 dev_err(&hif_dev->udev->dev,
 631                                         "ath9k_htc: over RX MAX_PKT_NUM\n");
 632                                 goto err;
 633                         }
 634                         nskb = __dev_alloc_skb(pkt_len + 32, GFP_ATOMIC);
 635                         if (!nskb) {
 636                                 dev_err(&hif_dev->udev->dev,
 637                                         "ath9k_htc: RX memory allocation error\n");
 638                                 goto err;
 639                         }
 640                         skb_reserve(nskb, 32);
 641                         RX_STAT_INC(skb_allocated);
 642
 643                         memcpy(nskb->data, &(skb->data[chk_idx+4]), pkt_len);
 644                         skb_put(nskb, pkt_len);
 645                         skb_pool[pool_index++] = nskb;
 646                 }
 647         }
 648
 649 err:
 650         for (i = 0; i < pool_index; i++) {
 651                 RX_STAT_ADD(skb_completed_bytes, skb_pool[i]->len);
 652                 ath9k_htc_rx_msg(hif_dev->htc_handle, skb_pool[i],
 653                                  skb_pool[i]->len, USB_WLAN_RX_PIPE);
 654                 RX_STAT_INC(skb_completed);
 655         }
 656 }
 657
 658 static void ath9k_hif_usb_rx_cb(struct urb *urb)
 659 {
 660         struct rx_buf *rx_buf = (struct rx_buf *)urb->context;
 661         struct hif_device_usb *hif_dev = rx_buf->hif_dev;
 662         struct sk_buff *skb = rx_buf->skb;
 663         int ret;
 664
 665         if (!skb)
 666                 return;
 667
 668         if (!hif_dev)
 669                 goto free;
 670
 671         switch (urb->status) {
 672         case 0:
 673                 break;
 674         case -ENOENT:
 675         case -ECONNRESET:
 676         case -ENODEV:
 677         case -ESHUTDOWN:
 678                 goto free;
 679         default:
 680                 goto resubmit;
 681         }
 682
 683         if (likely(urb->actual_length != 0)) {
 684                 skb_put(skb, urb->actual_length);
 685                 ath9k_hif_usb_rx_stream(hif_dev, skb);
 686         }
 687
 688 resubmit:
 689         skb_reset_tail_pointer(skb);
 690         skb_trim(skb, 0);
 691
 692         usb_anchor_urb(urb, &hif_dev->rx_submitted);
 693         ret = usb_submit_urb(urb, GFP_ATOMIC);
 694         if (ret) {
 695                 usb_unanchor_urb(urb);
 696                 goto free;
 697         }
 698
 699         return;
 700 free:
 701         kfree_skb(skb);
 702         kfree(rx_buf);
 703 }
 704
 705 static void ath9k_hif_usb_reg_in_cb(struct urb *urb)
 706 {
 707         struct rx_buf *rx_buf = (struct rx_buf *)urb->context;
 708         struct hif_device_usb *hif_dev = rx_buf->hif_dev;
 709         struct sk_buff *skb = rx_buf->skb;
 710         struct sk_buff *nskb;
 711         int ret;
 712
 713         if (!skb)
 714                 return;
 715
 716         if (!hif_dev)
 717                 goto free;
 718
 719         switch (urb->status) {
 720         case 0:
 721                 break;
 722         case -ENOENT:
 723         case -ECONNRESET:
 724         case -ENODEV:
 725         case -ESHUTDOWN:
 726                 goto free;
 727         default:
 728                 skb_reset_tail_pointer(skb);
 729                 skb_trim(skb, 0);
 730
 731                 goto resubmit;
 732         }
 733
 734         if (likely(urb->actual_length != 0)) {
 735                 skb_put(skb, urb->actual_length);
 736
 737                 /* Process the command first */
 738                 ath9k_htc_rx_msg(hif_dev->htc_handle, skb,
 739                                  skb->len, USB_REG_IN_PIPE);
 740
 741
 742                 nskb = alloc_skb(MAX_REG_IN_BUF_SIZE, GFP_ATOMIC);
 743                 if (!nskb) {
 744                         dev_err(&hif_dev->udev->dev,
 745                                 "ath9k_htc: REG_IN memory allocation failure\n");
 746                         urb->context = NULL;
 747                         return;
 748                 }
 749
 750                 rx_buf->skb = nskb;
 751
 752                 usb_fill_int_urb(urb, hif_dev->udev,
 753                                  usb_rcvintpipe(hif_dev->udev,
 754                                                  USB_REG_IN_PIPE),
 755                                  nskb->data, MAX_REG_IN_BUF_SIZE,
 756                                  ath9k_hif_usb_reg_in_cb, rx_buf, 1);
 757         }
 758
 759 resubmit:
 760         usb_anchor_urb(urb, &hif_dev->reg_in_submitted);
 761         ret = usb_submit_urb(urb, GFP_ATOMIC);
 762         if (ret) {
 763                 usb_unanchor_urb(urb);
 764                 goto free;
 765         }
 766
 767         return;
 768 free:
 769         kfree_skb(skb);
 770         kfree(rx_buf);
 771         urb->context = NULL;
 772 }
 773
 774 static void ath9k_hif_usb_dealloc_tx_urbs(struct hif_device_usb *hif_dev)
 775 {
 776         struct tx_buf *tx_buf = NULL, *tx_buf_tmp = NULL;
 777         unsigned long flags;
 778
 779         spin_lock_irqsave(&hif_dev->tx.tx_lock, flags);
 780         list_for_each_entry_safe(tx_buf, tx_buf_tmp,
 781                                  &hif_dev->tx.tx_buf, list) {
 782                 usb_get_urb(tx_buf->urb);
 783                 spin_unlock_irqrestore(&hif_dev->tx.tx_lock, flags);
 784                 usb_kill_urb(tx_buf->urb);
 785                 list_del(&tx_buf->list);
 786                 usb_free_urb(tx_buf->urb);
 787                 kfree(tx_buf->buf);
 788                 kfree(tx_buf);
 789                 spin_lock_irqsave(&hif_dev->tx.tx_lock, flags);
 790         }
 791         spin_unlock_irqrestore(&hif_dev->tx.tx_lock, flags);
 792
 793         spin_lock_irqsave(&hif_dev->tx.tx_lock, flags);
 794         hif_dev->tx.flags |= HIF_USB_TX_FLUSH;
 795         spin_unlock_irqrestore(&hif_dev->tx.tx_lock, flags);
 796
 797         spin_lock_irqsave(&hif_dev->tx.tx_lock, flags);
 798         list_for_each_entry_safe(tx_buf, tx_buf_tmp,
 799                                  &hif_dev->tx.tx_pending, list) {
 800                 usb_get_urb(tx_buf->urb);
 801                 spin_unlock_irqrestore(&hif_dev->tx.tx_lock, flags);
 802                 usb_kill_urb(tx_buf->urb);
 803                 list_del(&tx_buf->list);
 804                 usb_free_urb(tx_buf->urb);
 805                 kfree(tx_buf->buf);
 806                 kfree(tx_buf);
 807                 spin_lock_irqsave(&hif_dev->tx.tx_lock, flags);
 808         }
 809         spin_unlock_irqrestore(&hif_dev->tx.tx_lock, flags);
 810
 811         usb_kill_anchored_urbs(&hif_dev->mgmt_submitted);
 812 }
 813
 814 static int ath9k_hif_usb_alloc_tx_urbs(struct hif_device_usb *hif_dev)
 815 {
 816         struct tx_buf *tx_buf;
 817         int i;
 818
 819         INIT_LIST_HEAD(&hif_dev->tx.tx_buf);
 820         INIT_LIST_HEAD(&hif_dev->tx.tx_pending);
 821         spin_lock_init(&hif_dev->tx.tx_lock);
 822         __skb_queue_head_init(&hif_dev->tx.tx_skb_queue);
 823         init_usb_anchor(&hif_dev->mgmt_submitted);
 824
 825         for (i = 0; i < MAX_TX_URB_NUM; i++) {
 826                 tx_buf = kzalloc(sizeof(*tx_buf), GFP_KERNEL);
 827                 if (!tx_buf)
 828                         goto err;
 829
 830                 tx_buf->buf = kzalloc(MAX_TX_BUF_SIZE, GFP_KERNEL);
 831                 if (!tx_buf->buf)
 832                         goto err;
 833
 834                 tx_buf->urb = usb_alloc_urb(0, GFP_KERNEL);
 835                 if (!tx_buf->urb)
 836                         goto err;
 837
 838                 tx_buf->hif_dev = hif_dev;
 839                 __skb_queue_head_init(&tx_buf->skb_queue);
 840
 841                 list_add_tail(&tx_buf->list, &hif_dev->tx.tx_buf);
 842         }
 843
 844         hif_dev->tx.tx_buf_cnt = MAX_TX_URB_NUM;
 845
 846         return 0;
 847 err:
 848         if (tx_buf) {
 849                 kfree(tx_buf->buf);
 850                 kfree(tx_buf);
 851         }
 852         ath9k_hif_usb_dealloc_tx_urbs(hif_dev);
 853         return -ENOMEM;
 854 }
 855
 856 static void ath9k_hif_usb_dealloc_rx_urbs(struct hif_device_usb *hif_dev)
 857 {
 858         usb_kill_anchored_urbs(&hif_dev->rx_submitted);
 859 }
 860
 861 static int ath9k_hif_usb_alloc_rx_urbs(struct hif_device_usb *hif_dev)
 862 {
 863         struct rx_buf *rx_buf = NULL;
 864         struct sk_buff *skb = NULL;
 865         struct urb *urb = NULL;
 866         int i, ret;
 867
 868         init_usb_anchor(&hif_dev->rx_submitted);
 869         spin_lock_init(&hif_dev->rx_lock);
 870
 871         for (i = 0; i < MAX_RX_URB_NUM; i++) {
 872
 873                 rx_buf = kzalloc(sizeof(*rx_buf), GFP_KERNEL);
 874                 if (!rx_buf) {
 875                         ret = -ENOMEM;
 876                         goto err_rxb;
 877                 }
 878
 879                 /* Allocate URB */
 880                 urb = usb_alloc_urb(0, GFP_KERNEL);
 881                 if (urb == NULL) {
 882                         ret = -ENOMEM;
 883                         goto err_urb;
 884                 }
 885
 886                 /* Allocate buffer */
 887                 skb = alloc_skb(MAX_RX_BUF_SIZE, GFP_KERNEL);
 888                 if (!skb) {
 889                         ret = -ENOMEM;
 890                         goto err_skb;
 891                 }
 892
 893                 rx_buf->hif_dev = hif_dev;
 894                 rx_buf->skb = skb;
 895
 896                 usb_fill_bulk_urb(urb, hif_dev->udev,
 897                                   usb_rcvbulkpipe(hif_dev->udev,
 898                                                   USB_WLAN_RX_PIPE),
 899                                   skb->data, MAX_RX_BUF_SIZE,
 900                                   ath9k_hif_usb_rx_cb, rx_buf);
 901
 902                 /* Anchor URB */
 903                 usb_anchor_urb(urb, &hif_dev->rx_submitted);
 904
 905                 /* Submit URB */
 906                 ret = usb_submit_urb(urb, GFP_KERNEL);
 907                 if (ret) {
 908                         usb_unanchor_urb(urb);
 909                         goto err_submit;
 910                 }
 911
 912                 /*
 913                  * Drop reference count.
 914                  * This ensures that the URB is freed when killing them.
 915                  */
 916                 usb_free_urb(urb);
 917         }
 918
 919         return 0;
 920
 921 err_submit:
 922         kfree_skb(skb);
 923 err_skb:
 924         usb_free_urb(urb);
 925 err_urb:
 926         kfree(rx_buf);
 927 err_rxb:
 928         ath9k_hif_usb_dealloc_rx_urbs(hif_dev);
 929         return ret;
 930 }
 931
 932 static void ath9k_hif_usb_dealloc_reg_in_urbs(struct hif_device_usb *hif_dev)
 933 {
 934         usb_kill_anchored_urbs(&hif_dev->reg_in_submitted);
 935 }
 936
 937 static int ath9k_hif_usb_alloc_reg_in_urbs(struct hif_device_usb *hif_dev)
 938 {
 939         struct rx_buf *rx_buf = NULL;
 940         struct sk_buff *skb = NULL;
 941         struct urb *urb = NULL;
 942         int i, ret;
 943
 944         init_usb_anchor(&hif_dev->reg_in_submitted);
 945
 946         for (i = 0; i < MAX_REG_IN_URB_NUM; i++) {
 947
 948                 rx_buf = kzalloc(sizeof(*rx_buf), GFP_KERNEL);
 949                 if (!rx_buf) {
 950                         ret = -ENOMEM;
 951                         goto err_rxb;
 952                 }
 953
 954                 /* Allocate URB */
 955                 urb = usb_alloc_urb(0, GFP_KERNEL);
 956                 if (urb == NULL) {
 957                         ret = -ENOMEM;
 958                         goto err_urb;
 959                 }
 960
 961                 /* Allocate buffer */
 962                 skb = alloc_skb(MAX_REG_IN_BUF_SIZE, GFP_KERNEL);
 963                 if (!skb) {
 964                         ret = -ENOMEM;
 965                         goto err_skb;
 966                 }
 967
 968                 rx_buf->hif_dev = hif_dev;
 969                 rx_buf->skb = skb;
 970
 971                 usb_fill_int_urb(urb, hif_dev->udev,
 972                                   usb_rcvintpipe(hif_dev->udev,
 973                                                   USB_REG_IN_PIPE),
 974                                   skb->data, MAX_REG_IN_BUF_SIZE,
 975                                   ath9k_hif_usb_reg_in_cb, rx_buf, 1);
 976
 977                 /* Anchor URB */
 978                 usb_anchor_urb(urb, &hif_dev->reg_in_submitted);
 979
 980                 /* Submit URB */
 981                 ret = usb_submit_urb(urb, GFP_KERNEL);
 982                 if (ret) {
 983                         usb_unanchor_urb(urb);
 984                         goto err_submit;
 985                 }
 986
 987                 /*
 988                  * Drop reference count.
 989                  * This ensures that the URB is freed when killing them.
 990                  */
 991                 usb_free_urb(urb);
 992         }
 993
 994         return 0;
 995
 996 err_submit:
 997         kfree_skb(skb);
 998 err_skb:
 999         usb_free_urb(urb);
1000 err_urb:
1001         kfree(rx_buf);
1002 err_rxb:
1003         ath9k_hif_usb_dealloc_reg_in_urbs(hif_dev);
1004         return ret;
1005 }
1006
1007 static int ath9k_hif_usb_alloc_urbs(struct hif_device_usb *hif_dev)
1008 {
1009         /* Register Write */
1010         init_usb_anchor(&hif_dev->regout_submitted);
1011
1012         /* TX */
1013         if (ath9k_hif_usb_alloc_tx_urbs(hif_dev) < 0)
1014                 goto err;
1015
1016         /* RX */
1017         if (ath9k_hif_usb_alloc_rx_urbs(hif_dev) < 0)
1018                 goto err_rx;
1019
1020         /* Register Read */
1021         if (ath9k_hif_usb_alloc_reg_in_urbs(hif_dev) < 0)
1022                 goto err_reg;
1023
1024         return 0;
1025 err_reg:
1026         ath9k_hif_usb_dealloc_rx_urbs(hif_dev);
1027 err_rx:
1028         ath9k_hif_usb_dealloc_tx_urbs(hif_dev);
1029 err:
1030         return -ENOMEM;
1031 }
1032
1033 void ath9k_hif_usb_dealloc_urbs(struct hif_device_usb *hif_dev)
1034 {
1035         usb_kill_anchored_urbs(&hif_dev->regout_submitted);
1036         ath9k_hif_usb_dealloc_reg_in_urbs(hif_dev);
1037         ath9k_hif_usb_dealloc_tx_urbs(hif_dev);
1038         ath9k_hif_usb_dealloc_rx_urbs(hif_dev);
1039 }
1040
1041 static int ath9k_hif_usb_download_fw(struct hif_device_usb *hif_dev)
1042 {
1043         int transfer, err;
1044         const void *data = hif_dev->fw_data;
1045         size_t len = hif_dev->fw_size;
1046         u32 addr = AR9271_FIRMWARE;
1047         u8 *buf = kzalloc(4096, GFP_KERNEL);
1048         u32 firm_offset;
1049
1050         if (!buf)
1051                 return -ENOMEM;
1052
1053         while (len) {
1054                 transfer = min_t(size_t, len, 4096);
1055                 memcpy(buf, data, transfer);
1056
1057                 err = usb_control_msg(hif_dev->udev,
1058                                       usb_sndctrlpipe(hif_dev->udev, 0),
1059                                       FIRMWARE_DOWNLOAD, 0x40 | USB_DIR_OUT,
1060                                       addr >> 8, 0, buf, transfer, HZ);
1061                 if (err < 0) {
1062                         kfree(buf);
1063                         return err;
1064                 }
1065
1066                 len -= transfer;
1067                 data += transfer;
1068                 addr += transfer;
1069         }
1070         kfree(buf);
1071
1072         if (IS_AR7010_DEVICE(hif_dev->usb_device_id->driver_info))
1073                 firm_offset = AR7010_FIRMWARE_TEXT;
1074         else
1075                 firm_offset = AR9271_FIRMWARE_TEXT;
1076
1077         /*
1078          * Issue FW download complete command to firmware.
1079          */
1080         err = usb_control_msg(hif_dev->udev, usb_sndctrlpipe(hif_dev->udev, 0),
1081                               FIRMWARE_DOWNLOAD_COMP,
1082                               0x40 | USB_DIR_OUT,
1083                               firm_offset >> 8, 0, NULL, 0, HZ);
1084         if (err)
1085                 return -EIO;
1086
1087         dev_info(&hif_dev->udev->dev, "ath9k_htc: Transferred FW: %s, size: %ld\n",
1088                  hif_dev->fw_name, (unsigned long) hif_dev->fw_size);
1089
1090         return 0;
1091 }
1092
1093 static int ath9k_hif_usb_dev_init(struct hif_device_usb *hif_dev)
1094 {
1095         int ret;
1096
1097         ret = ath9k_hif_usb_download_fw(hif_dev);
1098         if (ret) {
1099                 dev_err(&hif_dev->udev->dev,
1100                         "ath9k_htc: Firmware - %s download failed\n",
1101                         hif_dev->fw_name);
1102                 return ret;
1103         }
1104
1105         /* Alloc URBs */
1106         ret = ath9k_hif_usb_alloc_urbs(hif_dev);
1107         if (ret) {
1108                 dev_err(&hif_dev->udev->dev,
1109                         "ath9k_htc: Unable to allocate URBs\n");
1110                 return ret;
1111         }
1112
1113         return 0;
1114 }
1115
1116 static void ath9k_hif_usb_dev_deinit(struct hif_device_usb *hif_dev)
1117 {
1118         ath9k_hif_usb_dealloc_urbs(hif_dev);
1119 }
1120
1121 /*
1122  * If initialization fails or the FW cannot be retrieved,
1123  * detach the device.
1124  */
1125 static void ath9k_hif_usb_firmware_fail(struct hif_device_usb *hif_dev)
1126 {
1127         struct device *dev = &hif_dev->udev->dev;
1128         struct device *parent = dev->parent;
1129
1130         complete_all(&hif_dev->fw_done);
1131
1132         if (parent)
1133                 device_lock(parent);
1134
1135         device_release_driver(dev);
1136
1137         if (parent)
1138                 device_unlock(parent);
1139 }
1140
1141 static void ath9k_hif_usb_firmware_cb(const struct firmware *fw, void *context);
1142
1143 /* taken from iwlwifi */
1144 static int ath9k_hif_request_firmware(struct hif_device_usb *hif_dev,
1145                                       bool first)
1146 {
1147         char index[8], *chip;
1148         int ret;
1149
1150         if (first) {
1151                 if (htc_use_dev_fw) {
1152                         hif_dev->fw_minor_index = FIRMWARE_MINOR_IDX_MAX + 1;
1153                         sprintf(index, "%s", "dev");
1154                 } else {
1155                         hif_dev->fw_minor_index = FIRMWARE_MINOR_IDX_MAX;
1156                         sprintf(index, "%d", hif_dev->fw_minor_index);
1157                 }
1158         } else {
1159                 hif_dev->fw_minor_index--;
1160                 sprintf(index, "%d", hif_dev->fw_minor_index);
1161         }
1162
1163         /* test for FW 1.3 */
1164         if (MAJOR_VERSION_REQ == 1 && hif_dev->fw_minor_index == 3) {
1165                 const char *filename;
1166
1167                 if (IS_AR7010_DEVICE(hif_dev->usb_device_id->driver_info))
1168                         filename = FIRMWARE_AR7010_1_1;
1169                 else
1170                         filename = FIRMWARE_AR9271;
1171
1172                 /* expected fw locations:
1173                  * - htc_9271.fw   (stable version 1.3, depricated)
1174                  */
1175                 snprintf(hif_dev->fw_name, sizeof(hif_dev->fw_name),
1176                          "%s", filename);
1177
1178         } else if (hif_dev->fw_minor_index < FIRMWARE_MINOR_IDX_MIN) {
1179                 dev_err(&hif_dev->udev->dev, "no suitable firmware found!\n");
1180
1181                 return -ENOENT;
1182         } else {
1183                 if (IS_AR7010_DEVICE(hif_dev->usb_device_id->driver_info))
1184                         chip = "7010";
1185                 else
1186                         chip = "9271";
1187
1188                 /* expected fw locations:
1189                  * - ath9k_htc/htc_9271-1.dev.0.fw (development version)
1190                  * - ath9k_htc/htc_9271-1.4.0.fw   (stable version)
1191                  */
1192                 snprintf(hif_dev->fw_name, sizeof(hif_dev->fw_name),
1193                          "%s/htc_%s-%d.%s.0.fw", HTC_FW_PATH,
1194                          chip, MAJOR_VERSION_REQ, index);
1195         }
1196
1197         ret = request_firmware_nowait(THIS_MODULE, true, hif_dev->fw_name,
1198                                       &hif_dev->udev->dev, GFP_KERNEL,
1199                                       hif_dev, ath9k_hif_usb_firmware_cb);
1200         if (ret) {
1201                 dev_err(&hif_dev->udev->dev,
1202                         "ath9k_htc: Async request for firmware %s failed\n",
1203                         hif_dev->fw_name);
1204                 return ret;
1205         }
1206
1207         dev_info(&hif_dev->udev->dev, "ath9k_htc: Firmware %s requested\n",
1208                  hif_dev->fw_name);
1209
1210         return ret;
1211 }
1212
1213 static void ath9k_hif_usb_firmware_cb(const struct firmware *fw, void *context)
1214 {
1215         struct hif_device_usb *hif_dev = context;
1216         int ret;
1217
1218         if (!fw) {
1219                 ret = ath9k_hif_request_firmware(hif_dev, false);
1220                 if (!ret)
1221                         return;
1222
1223                 dev_err(&hif_dev->udev->dev,
1224                         "ath9k_htc: Failed to get firmware %s\n",
1225                         hif_dev->fw_name);
1226                 goto err_fw;
1227         }
1228
1229         hif_dev->htc_handle = ath9k_htc_hw_alloc(hif_dev, &hif_usb,
1230                                                  &hif_dev->udev->dev);
1231         if (hif_dev->htc_handle == NULL)
1232                 goto err_dev_alloc;
1233
1234         hif_dev->fw_data = fw->data;
1235         hif_dev->fw_size = fw->size;
1236
1237         /* Proceed with initialization */
1238
1239         ret = ath9k_hif_usb_dev_init(hif_dev);
1240         if (ret)
1241                 goto err_dev_init;
1242
1243         ret = ath9k_htc_hw_init(hif_dev->htc_handle,
1244                                 &hif_dev->interface->dev,
1245                                 hif_dev->usb_device_id->idProduct,
1246                                 hif_dev->udev->product,
1247                                 hif_dev->usb_device_id->driver_info);
1248         if (ret) {
1249                 ret = -EINVAL;
1250                 goto err_htc_hw_init;
1251         }
1252
1253         release_firmware(fw);
1254         hif_dev->flags |= HIF_USB_READY;
1255         complete_all(&hif_dev->fw_done);
1256
1257         return;
1258
1259 err_htc_hw_init:
1260         ath9k_hif_usb_dev_deinit(hif_dev);
1261 err_dev_init:
1262         ath9k_htc_hw_free(hif_dev->htc_handle);
1263 err_dev_alloc:
1264         release_firmware(fw);
1265 err_fw:
1266         ath9k_hif_usb_firmware_fail(hif_dev);
1267 }
1268
1269 /*
1270  * An exact copy of the function from zd1211rw.
1271  */
1272 static int send_eject_command(struct usb_interface *interface)
1273 {
1274         struct usb_device *udev = interface_to_usbdev(interface);
1275         struct usb_host_interface *iface_desc = interface->cur_altsetting;
1276         struct usb_endpoint_descriptor *endpoint;
1277         unsigned char *cmd;
1278         u8 bulk_out_ep;
1279         int r;
1280
1281         if (iface_desc->desc.bNumEndpoints < 2)
1282                 return -ENODEV;
1283
1284         /* Find bulk out endpoint */
1285         for (r = 1; r >= 0; r--) {
1286                 endpoint = &iface_desc->endpoint[r].desc;
1287                 if (usb_endpoint_dir_out(endpoint) &&
1288                     usb_endpoint_xfer_bulk(endpoint)) {
1289                         bulk_out_ep = endpoint->bEndpointAddress;
1290                         break;
1291                 }
1292         }
1293         if (r == -1) {
1294                 dev_err(&udev->dev,
1295                         "ath9k_htc: Could not find bulk out endpoint\n");
1296                 return -ENODEV;
1297         }
1298
1299         cmd = kzalloc(31, GFP_KERNEL);
1300         if (cmd == NULL)
1301                 return -ENODEV;
1302
1303         /* USB bulk command block */
1304         cmd[0] = 0x55;  /* bulk command signature */
1305         cmd[1] = 0x53;  /* bulk command signature */
1306         cmd[2] = 0x42;  /* bulk command signature */
1307         cmd[3] = 0x43;  /* bulk command signature */
1308         cmd[14] = 6;    /* command length */
1309
1310         cmd[15] = 0x1b; /* SCSI command: START STOP UNIT */
1311         cmd[19] = 0x2;  /* eject disc */
1312
1313         dev_info(&udev->dev, "Ejecting storage device...\n");
1314         r = usb_bulk_msg(udev, usb_sndbulkpipe(udev, bulk_out_ep),
1315                 cmd, 31, NULL, 2000);
1316         kfree(cmd);
1317         if (r)
1318                 return r;
1319
1320         /* At this point, the device disconnects and reconnects with the real
1321          * ID numbers. */
1322
1323         usb_set_intfdata(interface, NULL);
1324         return 0;
1325 }
1326
1327 static int ath9k_hif_usb_probe(struct usb_interface *interface,
1328                                const struct usb_device_id *id)
1329 {
1330         struct usb_device *udev = interface_to_usbdev(interface);
1331         struct hif_device_usb *hif_dev;
1332         int ret = 0;
1333
1334         if (id->driver_info == STORAGE_DEVICE)
1335                 return send_eject_command(interface);
1336
1337         hif_dev = kzalloc(sizeof(struct hif_device_usb), GFP_KERNEL);
1338         if (!hif_dev) {
1339                 ret = -ENOMEM;
1340                 goto err_alloc;
1341         }
1342
1343         usb_get_dev(udev);
1344
1345         hif_dev->udev = udev;
1346         hif_dev->interface = interface;
1347         hif_dev->usb_device_id = id;
1348 #ifdef CONFIG_PM
1349         udev->reset_resume = 1;
1350 #endif
1351         usb_set_intfdata(interface, hif_dev);
1352
1353         init_completion(&hif_dev->fw_done);
1354
1355         ret = ath9k_hif_request_firmware(hif_dev, true);
1356         if (ret)
1357                 goto err_fw_req;
1358
1359         return ret;
1360
1361 err_fw_req:
1362         usb_set_intfdata(interface, NULL);
1363         kfree(hif_dev);
1364         usb_put_dev(udev);
1365 err_alloc:
1366         return ret;
1367 }
1368
1369 static void ath9k_hif_usb_reboot(struct usb_device *udev)
1370 {
1371         u32 reboot_cmd = 0xffffffff;
1372         void *buf;
1373         int ret;
1374
1375         buf = kmemdup(&reboot_cmd, 4, GFP_KERNEL);
1376         if (!buf)
1377                 return;
1378
1379         ret = usb_interrupt_msg(udev, usb_sndintpipe(udev, USB_REG_OUT_PIPE),
1380                            buf, 4, NULL, HZ);
1381         if (ret)
1382                 dev_err(&udev->dev, "ath9k_htc: USB reboot failed\n");
1383
1384         kfree(buf);
1385 }
1386
1387 static void ath9k_hif_usb_disconnect(struct usb_interface *interface)
1388 {
1389         struct usb_device *udev = interface_to_usbdev(interface);
1390         struct hif_device_usb *hif_dev = usb_get_intfdata(interface);
1391         bool unplugged = (udev->state == USB_STATE_NOTATTACHED) ? true : false;
1392
1393         if (!hif_dev)
1394                 return;
1395
1396         wait_for_completion(&hif_dev->fw_done);
1397
1398         if (hif_dev->flags & HIF_USB_READY) {
1399                 ath9k_htc_hw_deinit(hif_dev->htc_handle, unplugged);
1400                 ath9k_hif_usb_dev_deinit(hif_dev);
1401                 ath9k_destoy_wmi(hif_dev->htc_handle->drv_priv);
1402                 ath9k_htc_hw_free(hif_dev->htc_handle);
1403         }
1404
1405         usb_set_intfdata(interface, NULL);
1406
1407         /* If firmware was loaded we should drop it
1408          * go back to first stage bootloader. */
1409         if (!unplugged && (hif_dev->flags & HIF_USB_READY))
1410                 ath9k_hif_usb_reboot(udev);
1411
1412         kfree(hif_dev);
1413         dev_info(&udev->dev, "ath9k_htc: USB layer deinitialized\n");
1414         usb_put_dev(udev);
1415 }
1416
1417 #ifdef CONFIG_PM
1418 static int ath9k_hif_usb_suspend(struct usb_interface *interface,
1419                                  pm_message_t message)
1420 {
1421         struct hif_device_usb *hif_dev = usb_get_intfdata(interface);
1422
1423         /*
1424          * The device has to be set to FULLSLEEP mode in case no
1425          * interface is up.
1426          */
1427         if (!(hif_dev->flags & HIF_USB_START))
1428                 ath9k_htc_suspend(hif_dev->htc_handle);
1429
1430         wait_for_completion(&hif_dev->fw_done);
1431
1432         if (hif_dev->flags & HIF_USB_READY)
1433                 ath9k_hif_usb_dealloc_urbs(hif_dev);
1434
1435         return 0;
1436 }
1437
1438 static int ath9k_hif_usb_resume(struct usb_interface *interface)
1439 {
1440         struct hif_device_usb *hif_dev = usb_get_intfdata(interface);
1441         struct htc_target *htc_handle = hif_dev->htc_handle;
1442         int ret;
1443         const struct firmware *fw;
1444
1445         ret = ath9k_hif_usb_alloc_urbs(hif_dev);
1446         if (ret)
1447                 return ret;
1448
1449         if (hif_dev->flags & HIF_USB_READY) {
1450                 /* request cached firmware during suspend/resume cycle */
1451                 ret = request_firmware(&fw, hif_dev->fw_name,
1452                                        &hif_dev->udev->dev);
1453                 if (ret)
1454                         goto fail_resume;
1455
1456                 hif_dev->fw_data = fw->data;
1457                 hif_dev->fw_size = fw->size;
1458                 ret = ath9k_hif_usb_download_fw(hif_dev);
1459                 release_firmware(fw);
1460                 if (ret)
1461                         goto fail_resume;
1462         } else {
1463                 ath9k_hif_usb_dealloc_urbs(hif_dev);
1464                 return -EIO;
1465         }
1466
1467         mdelay(100);
1468
1469         ret = ath9k_htc_resume(htc_handle);
1470
1471         if (ret)
1472                 goto fail_resume;
1473
1474         return 0;
1475
1476 fail_resume:
1477         ath9k_hif_usb_dealloc_urbs(hif_dev);
1478
1479         return ret;
1480 }
1481 #endif
1482
1483 static struct usb_driver ath9k_hif_usb_driver = {
1484         .name = KBUILD_MODNAME,
1485         .probe = ath9k_hif_usb_probe,
1486         .disconnect = ath9k_hif_usb_disconnect,
1487 #ifdef CONFIG_PM
1488         .suspend = ath9k_hif_usb_suspend,
1489         .resume = ath9k_hif_usb_resume,
1490         .reset_resume = ath9k_hif_usb_resume,
1491 #endif
1492         .id_table = ath9k_hif_usb_ids,
1493         .soft_unbind = 1,
1494         .disable_hub_initiated_lpm = 1,
1495 };
1496
1497 int ath9k_hif_usb_init(void)
1498 {
1499         return usb_register(&ath9k_hif_usb_driver);
1500 }
1501
1502 void ath9k_hif_usb_exit(void)
1503 {
1504         usb_deregister(&ath9k_hif_usb_driver);
1505 }