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