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 const 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(0x07b8, 0x9271) }, /* Altai WA1011N-GU */
  28         { USB_DEVICE(0x07D1, 0x3A10) }, /* Dlink Wireless 150 */
  29         { USB_DEVICE(0x13D3, 0x3327) }, /* Azurewave */
  30         { USB_DEVICE(0x13D3, 0x3328) }, /* Azurewave */
  31         { USB_DEVICE(0x13D3, 0x3346) }, /* IMC Networks */
  32         { USB_DEVICE(0x13D3, 0x3348) }, /* Azurewave */
  33         { USB_DEVICE(0x13D3, 0x3349) }, /* Azurewave */
  34         { USB_DEVICE(0x13D3, 0x3350) }, /* Azurewave */
  35         { USB_DEVICE(0x04CA, 0x4605) }, /* Liteon */
  36         { USB_DEVICE(0x040D, 0x3801) }, /* VIA */
  37         { USB_DEVICE(0x0cf3, 0xb003) }, /* Ubiquiti WifiStation Ext */
  38         { USB_DEVICE(0x0cf3, 0xb002) }, /* Ubiquiti WifiStation */
  39         { USB_DEVICE(0x057c, 0x8403) }, /* AVM FRITZ!WLAN 11N v2 USB */
  40         { USB_DEVICE(0x0471, 0x209e) }, /* Philips (or NXP) PTA01 */
  41         { USB_DEVICE(0x1eda, 0x2315) }, /* AirTies */
  42
  43         { USB_DEVICE(0x0cf3, 0x7015),
  44           .driver_info = AR9287_USB },  /* Atheros */
  45         { USB_DEVICE(0x1668, 0x1200),
  46           .driver_info = AR9287_USB },  /* Verizon */
  47
  48         { USB_DEVICE(0x0cf3, 0x7010),
  49           .driver_info = AR9280_USB },  /* Atheros */
  50         { USB_DEVICE(0x0846, 0x9018),
  51           .driver_info = AR9280_USB },  /* Netgear WNDA3200 */
  52         { USB_DEVICE(0x083A, 0xA704),
  53           .driver_info = AR9280_USB },  /* SMC Networks */
  54         { USB_DEVICE(0x0411, 0x017f),
  55           .driver_info = AR9280_USB },  /* Sony UWA-BR100 */
  56         { USB_DEVICE(0x0411, 0x0197),
  57           .driver_info = AR9280_USB },  /* Buffalo WLI-UV-AG300P */
  58         { USB_DEVICE(0x04da, 0x3904),
  59           .driver_info = AR9280_USB },
  60         { USB_DEVICE(0x0930, 0x0a08),
  61           .driver_info = AR9280_USB },  /* Toshiba WLM-20U2 and GN-1080 */
  62
  63         { USB_DEVICE(0x0cf3, 0x20ff),
  64           .driver_info = STORAGE_DEVICE },
  65
  66         { },
  67 };
  68
  69 MODULE_DEVICE_TABLE(usb, ath9k_hif_usb_ids);
  70
  71 static int __hif_usb_tx(struct hif_device_usb *hif_dev);
  72
  73 static void hif_usb_regout_cb(struct urb *urb)
  74 {
  75         struct cmd_buf *cmd = (struct cmd_buf *)urb->context;
  76
  77         switch (urb->status) {
  78         case 0:
  79                 break;
  80         case -ENOENT:
  81         case -ECONNRESET:
  82         case -ENODEV:
  83         case -ESHUTDOWN:
  84                 goto free;
  85         default:
  86                 break;
  87         }
  88
  89         if (cmd) {
  90                 ath9k_htc_txcompletion_cb(cmd->hif_dev->htc_handle,
  91                                           cmd->skb, true);
  92                 kfree(cmd);
  93         }
  94
  95         return;
  96 free:
  97         kfree_skb(cmd->skb);
  98         kfree(cmd);
  99 }
 100
 101 static int hif_usb_send_regout(struct hif_device_usb *hif_dev,
 102                                struct sk_buff *skb)
 103 {
 104         struct urb *urb;
 105         struct cmd_buf *cmd;
 106         int ret = 0;
 107
 108         urb = usb_alloc_urb(0, GFP_KERNEL);
 109         if (urb == NULL)
 110                 return -ENOMEM;
 111
 112         cmd = kzalloc(sizeof(*cmd), GFP_KERNEL);
 113         if (cmd == NULL) {
 114                 usb_free_urb(urb);
 115                 return -ENOMEM;
 116         }
 117
 118         cmd->skb = skb;
 119         cmd->hif_dev = hif_dev;
 120
 121         usb_fill_int_urb(urb, hif_dev->udev,
 122                          usb_sndintpipe(hif_dev->udev, USB_REG_OUT_PIPE),
 123                          skb->data, skb->len,
 124                          hif_usb_regout_cb, cmd, 1);
 125
 126         usb_anchor_urb(urb, &hif_dev->regout_submitted);
 127         ret = usb_submit_urb(urb, GFP_KERNEL);
 128         if (ret) {
 129                 usb_unanchor_urb(urb);
 130                 kfree(cmd);
 131         }
 132         usb_free_urb(urb);
 133
 134         return ret;
 135 }
 136
 137 static void hif_usb_mgmt_cb(struct urb *urb)
 138 {
 139         struct cmd_buf *cmd = (struct cmd_buf *)urb->context;
 140         struct hif_device_usb *hif_dev;
 141         unsigned long flags;
 142         bool txok = true;
 143
 144         if (!cmd || !cmd->skb || !cmd->hif_dev)
 145                 return;
 146
 147         hif_dev = cmd->hif_dev;
 148
 149         switch (urb->status) {
 150         case 0:
 151                 break;
 152         case -ENOENT:
 153         case -ECONNRESET:
 154         case -ENODEV:
 155         case -ESHUTDOWN:
 156                 txok = false;
 157
 158                 /*
 159                  * If the URBs are being flushed, no need to complete
 160                  * this packet.
 161                  */
 162                 spin_lock_irqsave(&hif_dev->tx.tx_lock, flags);
 163                 if (hif_dev->tx.flags & HIF_USB_TX_FLUSH) {
 164                         spin_unlock_irqrestore(&hif_dev->tx.tx_lock, flags);
 165                         dev_kfree_skb_any(cmd->skb);
 166                         kfree(cmd);
 167                         return;
 168                 }
 169                 spin_unlock_irqrestore(&hif_dev->tx.tx_lock, flags);
 170
 171                 break;
 172         default:
 173                 txok = false;
 174                 break;
 175         }
 176
 177         skb_pull(cmd->skb, 4);
 178         ath9k_htc_txcompletion_cb(cmd->hif_dev->htc_handle,
 179                                   cmd->skb, txok);
 180         kfree(cmd);
 181 }
 182
 183 static int hif_usb_send_mgmt(struct hif_device_usb *hif_dev,
 184                              struct sk_buff *skb)
 185 {
 186         struct urb *urb;
 187         struct cmd_buf *cmd;
 188         int ret = 0;
 189         __le16 *hdr;
 190
 191         urb = usb_alloc_urb(0, GFP_ATOMIC);
 192         if (urb == NULL)
 193                 return -ENOMEM;
 194
 195         cmd = kzalloc(sizeof(*cmd), GFP_ATOMIC);
 196         if (cmd == NULL) {
 197                 usb_free_urb(urb);
 198                 return -ENOMEM;
 199         }
 200
 201         cmd->skb = skb;
 202         cmd->hif_dev = hif_dev;
 203
 204         hdr = skb_push(skb, 4);
 205         *hdr++ = cpu_to_le16(skb->len - 4);
 206         *hdr++ = cpu_to_le16(ATH_USB_TX_STREAM_MODE_TAG);
 207
 208         usb_fill_bulk_urb(urb, hif_dev->udev,
 209                          usb_sndbulkpipe(hif_dev->udev, USB_WLAN_TX_PIPE),
 210                          skb->data, skb->len,
 211                          hif_usb_mgmt_cb, cmd);
 212
 213         usb_anchor_urb(urb, &hif_dev->mgmt_submitted);
 214         ret = usb_submit_urb(urb, GFP_ATOMIC);
 215         if (ret) {
 216                 usb_unanchor_urb(urb);
 217                 kfree(cmd);
 218         }
 219         usb_free_urb(urb);
 220
 221         return ret;
 222 }
 223
 224 static inline void ath9k_skb_queue_purge(struct hif_device_usb *hif_dev,
 225                                          struct sk_buff_head *list)
 226 {
 227         struct sk_buff *skb;
 228
 229         while ((skb = __skb_dequeue(list)) != NULL) {
 230                 dev_kfree_skb_any(skb);
 231         }
 232 }
 233
 234 static inline void ath9k_skb_queue_complete(struct hif_device_usb *hif_dev,
 235                                             struct sk_buff_head *queue,
 236                                             bool txok)
 237 {
 238         struct sk_buff *skb;
 239
 240         while ((skb = __skb_dequeue(queue)) != NULL) {
 241 #ifdef CONFIG_ATH9K_HTC_DEBUGFS
 242                 int ln = skb->len;
 243 #endif
 244                 ath9k_htc_txcompletion_cb(hif_dev->htc_handle,
 245                                           skb, txok);
 246                 if (txok) {
 247                         TX_STAT_INC(hif_dev, skb_success);
 248                         TX_STAT_ADD(hif_dev, skb_success_bytes, ln);
 249                 }
 250                 else
 251                         TX_STAT_INC(hif_dev, skb_failed);
 252         }
 253 }
 254
 255 static void hif_usb_tx_cb(struct urb *urb)
 256 {
 257         struct tx_buf *tx_buf = (struct tx_buf *) urb->context;
 258         struct hif_device_usb *hif_dev;
 259         bool txok = true;
 260
 261         if (!tx_buf || !tx_buf->hif_dev)
 262                 return;
 263
 264         hif_dev = tx_buf->hif_dev;
 265
 266         switch (urb->status) {
 267         case 0:
 268                 break;
 269         case -ENOENT:
 270         case -ECONNRESET:
 271         case -ENODEV:
 272         case -ESHUTDOWN:
 273                 txok = false;
 274
 275                 /*
 276                  * If the URBs are being flushed, no need to add this
 277                  * URB to the free list.
 278                  */
 279                 spin_lock(&hif_dev->tx.tx_lock);
 280                 if (hif_dev->tx.flags & HIF_USB_TX_FLUSH) {
 281                         spin_unlock(&hif_dev->tx.tx_lock);
 282                         ath9k_skb_queue_purge(hif_dev, &tx_buf->skb_queue);
 283                         return;
 284                 }
 285                 spin_unlock(&hif_dev->tx.tx_lock);
 286
 287                 break;
 288         default:
 289                 txok = false;
 290                 break;
 291         }
 292
 293         ath9k_skb_queue_complete(hif_dev, &tx_buf->skb_queue, txok);
 294
 295         /* Re-initialize the SKB queue */
 296         tx_buf->len = tx_buf->offset = 0;
 297         __skb_queue_head_init(&tx_buf->skb_queue);
 298
 299         /* Add this TX buffer to the free list */
 300         spin_lock(&hif_dev->tx.tx_lock);
 301         list_move_tail(&tx_buf->list, &hif_dev->tx.tx_buf);
 302         hif_dev->tx.tx_buf_cnt++;
 303         if (!(hif_dev->tx.flags & HIF_USB_TX_STOP))
 304                 __hif_usb_tx(hif_dev); /* Check for pending SKBs */
 305         TX_STAT_INC(hif_dev, buf_completed);
 306         spin_unlock(&hif_dev->tx.tx_lock);
 307 }
 308
 309 /* TX lock has to be taken */
 310 static int __hif_usb_tx(struct hif_device_usb *hif_dev)
 311 {
 312         struct tx_buf *tx_buf = NULL;
 313         struct sk_buff *nskb = NULL;
 314         int ret = 0, i;
 315         u16 tx_skb_cnt = 0;
 316         u8 *buf;
 317         __le16 *hdr;
 318
 319         if (hif_dev->tx.tx_skb_cnt == 0)
 320                 return 0;
 321
 322         /* Check if a free TX buffer is available */
 323         if (list_empty(&hif_dev->tx.tx_buf))
 324                 return 0;
 325
 326         tx_buf = list_first_entry(&hif_dev->tx.tx_buf, struct tx_buf, list);
 327         list_move_tail(&tx_buf->list, &hif_dev->tx.tx_pending);
 328         hif_dev->tx.tx_buf_cnt--;
 329
 330         tx_skb_cnt = min_t(u16, hif_dev->tx.tx_skb_cnt, MAX_TX_AGGR_NUM);
 331
 332         for (i = 0; i < tx_skb_cnt; i++) {
 333                 nskb = __skb_dequeue(&hif_dev->tx.tx_skb_queue);
 334
 335                 /* Should never be NULL */
 336                 BUG_ON(!nskb);
 337
 338                 hif_dev->tx.tx_skb_cnt--;
 339
 340                 buf = tx_buf->buf;
 341                 buf += tx_buf->offset;
 342                 hdr = (__le16 *)buf;
 343                 *hdr++ = cpu_to_le16(nskb->len);
 344                 *hdr++ = cpu_to_le16(ATH_USB_TX_STREAM_MODE_TAG);
 345                 buf += 4;
 346                 memcpy(buf, nskb->data, nskb->len);
 347                 tx_buf->len = nskb->len + 4;
 348
 349                 if (i < (tx_skb_cnt - 1))
 350                         tx_buf->offset += (((tx_buf->len - 1) / 4) + 1) * 4;
 351
 352                 if (i == (tx_skb_cnt - 1))
 353                         tx_buf->len += tx_buf->offset;
 354
 355                 __skb_queue_tail(&tx_buf->skb_queue, nskb);
 356                 TX_STAT_INC(hif_dev, skb_queued);
 357         }
 358
 359         usb_fill_bulk_urb(tx_buf->urb, hif_dev->udev,
 360                           usb_sndbulkpipe(hif_dev->udev, USB_WLAN_TX_PIPE),
 361                           tx_buf->buf, tx_buf->len,
 362                           hif_usb_tx_cb, tx_buf);
 363
 364         ret = usb_submit_urb(tx_buf->urb, GFP_ATOMIC);
 365         if (ret) {
 366                 tx_buf->len = tx_buf->offset = 0;
 367                 ath9k_skb_queue_complete(hif_dev, &tx_buf->skb_queue, false);
 368                 __skb_queue_head_init(&tx_buf->skb_queue);
 369                 list_move_tail(&tx_buf->list, &hif_dev->tx.tx_buf);
 370                 hif_dev->tx.tx_buf_cnt++;
 371         } else {
 372                 TX_STAT_INC(hif_dev, buf_queued);
 373         }
 374
 375         return ret;
 376 }
 377
 378 static int hif_usb_send_tx(struct hif_device_usb *hif_dev, struct sk_buff *skb)
 379 {
 380         struct ath9k_htc_tx_ctl *tx_ctl;
 381         unsigned long flags;
 382         int ret = 0;
 383
 384         spin_lock_irqsave(&hif_dev->tx.tx_lock, flags);
 385
 386         if (hif_dev->tx.flags & HIF_USB_TX_STOP) {
 387                 spin_unlock_irqrestore(&hif_dev->tx.tx_lock, flags);
 388                 return -ENODEV;
 389         }
 390
 391         /* Check if the max queue count has been reached */
 392         if (hif_dev->tx.tx_skb_cnt > MAX_TX_BUF_NUM) {
 393                 spin_unlock_irqrestore(&hif_dev->tx.tx_lock, flags);
 394                 return -ENOMEM;
 395         }
 396
 397         spin_unlock_irqrestore(&hif_dev->tx.tx_lock, flags);
 398
 399         tx_ctl = HTC_SKB_CB(skb);
 400
 401         /* Mgmt/Beacon frames don't use the TX buffer pool */
 402         if ((tx_ctl->type == ATH9K_HTC_MGMT) ||
 403             (tx_ctl->type == ATH9K_HTC_BEACON)) {
 404                 ret = hif_usb_send_mgmt(hif_dev, skb);
 405         }
 406
 407         spin_lock_irqsave(&hif_dev->tx.tx_lock, flags);
 408
 409         if ((tx_ctl->type == ATH9K_HTC_NORMAL) ||
 410             (tx_ctl->type == ATH9K_HTC_AMPDU)) {
 411                 __skb_queue_tail(&hif_dev->tx.tx_skb_queue, skb);
 412                 hif_dev->tx.tx_skb_cnt++;
 413         }
 414
 415         /* Check if AMPDUs have to be sent immediately */
 416         if ((hif_dev->tx.tx_buf_cnt == MAX_TX_URB_NUM) &&
 417             (hif_dev->tx.tx_skb_cnt < 2)) {
 418                 __hif_usb_tx(hif_dev);
 419         }
 420
 421         spin_unlock_irqrestore(&hif_dev->tx.tx_lock, flags);
 422
 423         return ret;
 424 }
 425
 426 static void hif_usb_start(void *hif_handle)
 427 {
 428         struct hif_device_usb *hif_dev = hif_handle;
 429         unsigned long flags;
 430
 431         hif_dev->flags |= HIF_USB_START;
 432
 433         spin_lock_irqsave(&hif_dev->tx.tx_lock, flags);
 434         hif_dev->tx.flags &= ~HIF_USB_TX_STOP;
 435         spin_unlock_irqrestore(&hif_dev->tx.tx_lock, flags);
 436 }
 437
 438 static void hif_usb_stop(void *hif_handle)
 439 {
 440         struct hif_device_usb *hif_dev = hif_handle;
 441         struct tx_buf *tx_buf = NULL, *tx_buf_tmp = NULL;
 442         unsigned long flags;
 443
 444         spin_lock_irqsave(&hif_dev->tx.tx_lock, flags);
 445         ath9k_skb_queue_complete(hif_dev, &hif_dev->tx.tx_skb_queue, false);
 446         hif_dev->tx.tx_skb_cnt = 0;
 447         hif_dev->tx.flags |= HIF_USB_TX_STOP;
 448         spin_unlock_irqrestore(&hif_dev->tx.tx_lock, flags);
 449
 450         /* The pending URBs have to be canceled. */
 451         spin_lock_irqsave(&hif_dev->tx.tx_lock, flags);
 452         list_for_each_entry_safe(tx_buf, tx_buf_tmp,
 453                                  &hif_dev->tx.tx_pending, list) {
 454                 usb_get_urb(tx_buf->urb);
 455                 spin_unlock_irqrestore(&hif_dev->tx.tx_lock, flags);
 456                 usb_kill_urb(tx_buf->urb);
 457                 list_del(&tx_buf->list);
 458                 usb_free_urb(tx_buf->urb);
 459                 kfree(tx_buf->buf);
 460                 kfree(tx_buf);
 461                 spin_lock_irqsave(&hif_dev->tx.tx_lock, flags);
 462         }
 463         spin_unlock_irqrestore(&hif_dev->tx.tx_lock, flags);
 464
 465         usb_kill_anchored_urbs(&hif_dev->mgmt_submitted);
 466 }
 467
 468 static int hif_usb_send(void *hif_handle, u8 pipe_id, struct sk_buff *skb)
 469 {
 470         struct hif_device_usb *hif_dev = hif_handle;
 471         int ret = 0;
 472
 473         switch (pipe_id) {
 474         case USB_WLAN_TX_PIPE:
 475                 ret = hif_usb_send_tx(hif_dev, skb);
 476                 break;
 477         case USB_REG_OUT_PIPE:
 478                 ret = hif_usb_send_regout(hif_dev, skb);
 479                 break;
 480         default:
 481                 dev_err(&hif_dev->udev->dev,
 482                         "ath9k_htc: Invalid TX pipe: %d\n", pipe_id);
 483                 ret = -EINVAL;
 484                 break;
 485         }
 486
 487         return ret;
 488 }
 489
 490 static inline bool check_index(struct sk_buff *skb, u8 idx)
 491 {
 492         struct ath9k_htc_tx_ctl *tx_ctl;
 493
 494         tx_ctl = HTC_SKB_CB(skb);
 495
 496         if ((tx_ctl->type == ATH9K_HTC_AMPDU) &&
 497             (tx_ctl->sta_idx == idx))
 498                 return true;
 499
 500         return false;
 501 }
 502
 503 static void hif_usb_sta_drain(void *hif_handle, u8 idx)
 504 {
 505         struct hif_device_usb *hif_dev = hif_handle;
 506         struct sk_buff *skb, *tmp;
 507         unsigned long flags;
 508
 509         spin_lock_irqsave(&hif_dev->tx.tx_lock, flags);
 510
 511         skb_queue_walk_safe(&hif_dev->tx.tx_skb_queue, skb, tmp) {
 512                 if (check_index(skb, idx)) {
 513                         __skb_unlink(skb, &hif_dev->tx.tx_skb_queue);
 514                         ath9k_htc_txcompletion_cb(hif_dev->htc_handle,
 515                                                   skb, false);
 516                         hif_dev->tx.tx_skb_cnt--;
 517                         TX_STAT_INC(hif_dev, skb_failed);
 518                 }
 519         }
 520
 521         spin_unlock_irqrestore(&hif_dev->tx.tx_lock, flags);
 522 }
 523
 524 static struct ath9k_htc_hif hif_usb = {
 525         .transport = ATH9K_HIF_USB,
 526         .name = "ath9k_hif_usb",
 527
 528         .control_ul_pipe = USB_REG_OUT_PIPE,
 529         .control_dl_pipe = USB_REG_IN_PIPE,
 530
 531         .start = hif_usb_start,
 532         .stop = hif_usb_stop,
 533         .sta_drain = hif_usb_sta_drain,
 534         .send = hif_usb_send,
 535 };
 536
 537 /* Need to free remain_skb allocated in ath9k_hif_usb_rx_stream
 538  * in case ath9k_hif_usb_rx_stream wasn't called next time to
 539  * process the buffer and subsequently free it.
 540  */
 541 static void ath9k_hif_usb_free_rx_remain_skb(struct hif_device_usb *hif_dev)
 542 {
 543         unsigned long flags;
 544
 545         spin_lock_irqsave(&hif_dev->rx_lock, flags);
 546         if (hif_dev->remain_skb) {
 547                 dev_kfree_skb_any(hif_dev->remain_skb);
 548                 hif_dev->remain_skb = NULL;
 549                 hif_dev->rx_remain_len = 0;
 550                 RX_STAT_INC(hif_dev, skb_dropped);
 551         }
 552         spin_unlock_irqrestore(&hif_dev->rx_lock, flags);
 553 }
 554
 555 static void ath9k_hif_usb_rx_stream(struct hif_device_usb *hif_dev,
 556                                     struct sk_buff *skb)
 557 {
 558         struct sk_buff *nskb, *skb_pool[MAX_PKT_NUM_IN_TRANSFER];
 559         int index = 0, i, len = skb->len;
 560         int rx_remain_len, rx_pkt_len;
 561         u16 pool_index = 0;
 562         u8 *ptr;
 563
 564         spin_lock(&hif_dev->rx_lock);
 565
 566         rx_remain_len = hif_dev->rx_remain_len;
 567         rx_pkt_len = hif_dev->rx_transfer_len;
 568
 569         if (rx_remain_len != 0) {
 570                 struct sk_buff *remain_skb = hif_dev->remain_skb;
 571
 572                 if (remain_skb) {
 573                         ptr = (u8 *) remain_skb->data;
 574
 575                         index = rx_remain_len;
 576                         rx_remain_len -= hif_dev->rx_pad_len;
 577                         ptr += rx_pkt_len;
 578
 579                         memcpy(ptr, skb->data, rx_remain_len);
 580
 581                         rx_pkt_len += rx_remain_len;
 582                         skb_put(remain_skb, rx_pkt_len);
 583
 584                         skb_pool[pool_index++] = remain_skb;
 585                         hif_dev->remain_skb = NULL;
 586                         hif_dev->rx_remain_len = 0;
 587                 } else {
 588                         index = rx_remain_len;
 589                 }
 590         }
 591
 592         spin_unlock(&hif_dev->rx_lock);
 593
 594         while (index < len) {
 595                 u16 pkt_len;
 596                 u16 pkt_tag;
 597                 u16 pad_len;
 598                 int chk_idx;
 599
 600                 ptr = (u8 *) skb->data;
 601
 602                 pkt_len = get_unaligned_le16(ptr + index);
 603                 pkt_tag = get_unaligned_le16(ptr + index + 2);
 604
 605                 /* It is supposed that if we have an invalid pkt_tag or
 606                  * pkt_len then the whole input SKB is considered invalid
 607                  * and dropped; the associated packets already in skb_pool
 608                  * are dropped, too.
 609                  */
 610                 if (pkt_tag != ATH_USB_RX_STREAM_MODE_TAG) {
 611                         RX_STAT_INC(hif_dev, skb_dropped);
 612                         goto invalid_pkt;
 613                 }
 614
 615                 if (pkt_len > 2 * MAX_RX_BUF_SIZE) {
 616                         dev_err(&hif_dev->udev->dev,
 617                                 "ath9k_htc: invalid pkt_len (%x)\n", pkt_len);
 618                         RX_STAT_INC(hif_dev, skb_dropped);
 619                         goto invalid_pkt;
 620                 }
 621
 622                 pad_len = 4 - (pkt_len & 0x3);
 623                 if (pad_len == 4)
 624                         pad_len = 0;
 625
 626                 chk_idx = index;
 627                 index = index + 4 + pkt_len + pad_len;
 628
 629                 if (index > MAX_RX_BUF_SIZE) {
 630                         spin_lock(&hif_dev->rx_lock);
 631                         nskb = __dev_alloc_skb(pkt_len + 32, GFP_ATOMIC);
 632                         if (!nskb) {
 633                                 dev_err(&hif_dev->udev->dev,
 634                                         "ath9k_htc: RX memory allocation error\n");
 635                                 spin_unlock(&hif_dev->rx_lock);
 636                                 goto err;
 637                         }
 638
 639                         hif_dev->rx_remain_len = index - MAX_RX_BUF_SIZE;
 640                         hif_dev->rx_transfer_len =
 641                                 MAX_RX_BUF_SIZE - chk_idx - 4;
 642                         hif_dev->rx_pad_len = pad_len;
 643
 644                         skb_reserve(nskb, 32);
 645                         RX_STAT_INC(hif_dev, skb_allocated);
 646
 647                         memcpy(nskb->data, &(skb->data[chk_idx+4]),
 648                                hif_dev->rx_transfer_len);
 649
 650                         /* Record the buffer pointer */
 651                         hif_dev->remain_skb = nskb;
 652                         spin_unlock(&hif_dev->rx_lock);
 653                 } else {
 654                         if (pool_index == MAX_PKT_NUM_IN_TRANSFER) {
 655                                 dev_err(&hif_dev->udev->dev,
 656                                         "ath9k_htc: over RX MAX_PKT_NUM\n");
 657                                 goto err;
 658                         }
 659                         nskb = __dev_alloc_skb(pkt_len + 32, GFP_ATOMIC);
 660                         if (!nskb) {
 661                                 dev_err(&hif_dev->udev->dev,
 662                                         "ath9k_htc: RX memory allocation error\n");
 663                                 goto err;
 664                         }
 665                         skb_reserve(nskb, 32);
 666                         RX_STAT_INC(hif_dev, skb_allocated);
 667
 668                         memcpy(nskb->data, &(skb->data[chk_idx+4]), pkt_len);
 669                         skb_put(nskb, pkt_len);
 670                         skb_pool[pool_index++] = nskb;
 671                 }
 672         }
 673
 674 err:
 675         for (i = 0; i < pool_index; i++) {
 676                 RX_STAT_ADD(hif_dev, skb_completed_bytes, skb_pool[i]->len);
 677                 ath9k_htc_rx_msg(hif_dev->htc_handle, skb_pool[i],
 678                                  skb_pool[i]->len, USB_WLAN_RX_PIPE);
 679                 RX_STAT_INC(hif_dev, skb_completed);
 680         }
 681         return;
 682 invalid_pkt:
 683         for (i = 0; i < pool_index; i++) {
 684                 dev_kfree_skb_any(skb_pool[i]);
 685                 RX_STAT_INC(hif_dev, skb_dropped);
 686         }
 687         return;
 688 }
 689
 690 static void ath9k_hif_usb_rx_cb(struct urb *urb)
 691 {
 692         struct rx_buf *rx_buf = (struct rx_buf *)urb->context;
 693         struct hif_device_usb *hif_dev = rx_buf->hif_dev;
 694         struct sk_buff *skb = rx_buf->skb;
 695         int ret;
 696
 697         if (!skb)
 698                 return;
 699
 700         if (!hif_dev)
 701                 goto free;
 702
 703         switch (urb->status) {
 704         case 0:
 705                 break;
 706         case -ENOENT:
 707         case -ECONNRESET:
 708         case -ENODEV:
 709         case -ESHUTDOWN:
 710                 goto free;
 711         default:
 712                 goto resubmit;
 713         }
 714
 715         if (likely(urb->actual_length != 0)) {
 716                 skb_put(skb, urb->actual_length);
 717                 ath9k_hif_usb_rx_stream(hif_dev, skb);
 718         }
 719
 720 resubmit:
 721         skb_reset_tail_pointer(skb);
 722         skb_trim(skb, 0);
 723
 724         usb_anchor_urb(urb, &hif_dev->rx_submitted);
 725         ret = usb_submit_urb(urb, GFP_ATOMIC);
 726         if (ret) {
 727                 usb_unanchor_urb(urb);
 728                 goto free;
 729         }
 730
 731         return;
 732 free:
 733         kfree_skb(skb);
 734         kfree(rx_buf);
 735 }
 736
 737 static void ath9k_hif_usb_reg_in_cb(struct urb *urb)
 738 {
 739         struct rx_buf *rx_buf = (struct rx_buf *)urb->context;
 740         struct hif_device_usb *hif_dev = rx_buf->hif_dev;
 741         struct sk_buff *skb = rx_buf->skb;
 742         int ret;
 743
 744         if (!skb)
 745                 return;
 746
 747         if (!hif_dev)
 748                 goto free_skb;
 749
 750         switch (urb->status) {
 751         case 0:
 752                 break;
 753         case -ENOENT:
 754         case -ECONNRESET:
 755         case -ENODEV:
 756         case -ESHUTDOWN:
 757                 goto free_skb;
 758         default:
 759                 skb_reset_tail_pointer(skb);
 760                 skb_trim(skb, 0);
 761
 762                 goto resubmit;
 763         }
 764
 765         if (likely(urb->actual_length != 0)) {
 766                 skb_put(skb, urb->actual_length);
 767
 768                 /*
 769                  * Process the command first.
 770                  * skb is either freed here or passed to be
 771                  * managed to another callback function.
 772                  */
 773                 ath9k_htc_rx_msg(hif_dev->htc_handle, skb,
 774                                  skb->len, USB_REG_IN_PIPE);
 775
 776                 skb = alloc_skb(MAX_REG_IN_BUF_SIZE, GFP_ATOMIC);
 777                 if (!skb) {
 778                         dev_err(&hif_dev->udev->dev,
 779                                 "ath9k_htc: REG_IN memory allocation failure\n");
 780                         goto free_rx_buf;
 781                 }
 782
 783                 rx_buf->skb = skb;
 784
 785                 usb_fill_int_urb(urb, hif_dev->udev,
 786                                  usb_rcvintpipe(hif_dev->udev,
 787                                                  USB_REG_IN_PIPE),
 788                                  skb->data, MAX_REG_IN_BUF_SIZE,
 789                                  ath9k_hif_usb_reg_in_cb, rx_buf, 1);
 790         }
 791
 792 resubmit:
 793         usb_anchor_urb(urb, &hif_dev->reg_in_submitted);
 794         ret = usb_submit_urb(urb, GFP_ATOMIC);
 795         if (ret) {
 796                 usb_unanchor_urb(urb);
 797                 goto free_skb;
 798         }
 799
 800         return;
 801 free_skb:
 802         kfree_skb(skb);
 803 free_rx_buf:
 804         kfree(rx_buf);
 805         urb->context = NULL;
 806 }
 807
 808 static void ath9k_hif_usb_dealloc_tx_urbs(struct hif_device_usb *hif_dev)
 809 {
 810         struct tx_buf *tx_buf = NULL, *tx_buf_tmp = NULL;
 811         unsigned long flags;
 812
 813         spin_lock_irqsave(&hif_dev->tx.tx_lock, flags);
 814         list_for_each_entry_safe(tx_buf, tx_buf_tmp,
 815                                  &hif_dev->tx.tx_buf, list) {
 816                 list_del(&tx_buf->list);
 817                 usb_free_urb(tx_buf->urb);
 818                 kfree(tx_buf->buf);
 819                 kfree(tx_buf);
 820         }
 821         spin_unlock_irqrestore(&hif_dev->tx.tx_lock, flags);
 822
 823         spin_lock_irqsave(&hif_dev->tx.tx_lock, flags);
 824         hif_dev->tx.flags |= HIF_USB_TX_FLUSH;
 825         spin_unlock_irqrestore(&hif_dev->tx.tx_lock, flags);
 826
 827         spin_lock_irqsave(&hif_dev->tx.tx_lock, flags);
 828         list_for_each_entry_safe(tx_buf, tx_buf_tmp,
 829                                  &hif_dev->tx.tx_pending, list) {
 830                 usb_get_urb(tx_buf->urb);
 831                 spin_unlock_irqrestore(&hif_dev->tx.tx_lock, flags);
 832                 usb_kill_urb(tx_buf->urb);
 833                 list_del(&tx_buf->list);
 834                 usb_free_urb(tx_buf->urb);
 835                 kfree(tx_buf->buf);
 836                 kfree(tx_buf);
 837                 spin_lock_irqsave(&hif_dev->tx.tx_lock, flags);
 838         }
 839         spin_unlock_irqrestore(&hif_dev->tx.tx_lock, flags);
 840
 841         usb_kill_anchored_urbs(&hif_dev->mgmt_submitted);
 842 }
 843
 844 static int ath9k_hif_usb_alloc_tx_urbs(struct hif_device_usb *hif_dev)
 845 {
 846         struct tx_buf *tx_buf;
 847         int i;
 848
 849         INIT_LIST_HEAD(&hif_dev->tx.tx_buf);
 850         INIT_LIST_HEAD(&hif_dev->tx.tx_pending);
 851         spin_lock_init(&hif_dev->tx.tx_lock);
 852         __skb_queue_head_init(&hif_dev->tx.tx_skb_queue);
 853         init_usb_anchor(&hif_dev->mgmt_submitted);
 854
 855         for (i = 0; i < MAX_TX_URB_NUM; i++) {
 856                 tx_buf = kzalloc(sizeof(*tx_buf), GFP_KERNEL);
 857                 if (!tx_buf)
 858                         goto err;
 859
 860                 tx_buf->buf = kzalloc(MAX_TX_BUF_SIZE, GFP_KERNEL);
 861                 if (!tx_buf->buf)
 862                         goto err;
 863
 864                 tx_buf->urb = usb_alloc_urb(0, GFP_KERNEL);
 865                 if (!tx_buf->urb)
 866                         goto err;
 867
 868                 tx_buf->hif_dev = hif_dev;
 869                 __skb_queue_head_init(&tx_buf->skb_queue);
 870
 871                 list_add_tail(&tx_buf->list, &hif_dev->tx.tx_buf);
 872         }
 873
 874         hif_dev->tx.tx_buf_cnt = MAX_TX_URB_NUM;
 875
 876         return 0;
 877 err:
 878         if (tx_buf) {
 879                 kfree(tx_buf->buf);
 880                 kfree(tx_buf);
 881         }
 882         ath9k_hif_usb_dealloc_tx_urbs(hif_dev);
 883         return -ENOMEM;
 884 }
 885
 886 static void ath9k_hif_usb_dealloc_rx_urbs(struct hif_device_usb *hif_dev)
 887 {
 888         usb_kill_anchored_urbs(&hif_dev->rx_submitted);
 889         ath9k_hif_usb_free_rx_remain_skb(hif_dev);
 890 }
 891
 892 static int ath9k_hif_usb_alloc_rx_urbs(struct hif_device_usb *hif_dev)
 893 {
 894         struct rx_buf *rx_buf = NULL;
 895         struct sk_buff *skb = NULL;
 896         struct urb *urb = NULL;
 897         int i, ret;
 898
 899         init_usb_anchor(&hif_dev->rx_submitted);
 900         spin_lock_init(&hif_dev->rx_lock);
 901
 902         for (i = 0; i < MAX_RX_URB_NUM; i++) {
 903
 904                 rx_buf = kzalloc(sizeof(*rx_buf), GFP_KERNEL);
 905                 if (!rx_buf) {
 906                         ret = -ENOMEM;
 907                         goto err_rxb;
 908                 }
 909
 910                 /* Allocate URB */
 911                 urb = usb_alloc_urb(0, GFP_KERNEL);
 912                 if (urb == NULL) {
 913                         ret = -ENOMEM;
 914                         goto err_urb;
 915                 }
 916
 917                 /* Allocate buffer */
 918                 skb = alloc_skb(MAX_RX_BUF_SIZE, GFP_KERNEL);
 919                 if (!skb) {
 920                         ret = -ENOMEM;
 921                         goto err_skb;
 922                 }
 923
 924                 rx_buf->hif_dev = hif_dev;
 925                 rx_buf->skb = skb;
 926
 927                 usb_fill_bulk_urb(urb, hif_dev->udev,
 928                                   usb_rcvbulkpipe(hif_dev->udev,
 929                                                   USB_WLAN_RX_PIPE),
 930                                   skb->data, MAX_RX_BUF_SIZE,
 931                                   ath9k_hif_usb_rx_cb, rx_buf);
 932
 933                 /* Anchor URB */
 934                 usb_anchor_urb(urb, &hif_dev->rx_submitted);
 935
 936                 /* Submit URB */
 937                 ret = usb_submit_urb(urb, GFP_KERNEL);
 938                 if (ret) {
 939                         usb_unanchor_urb(urb);
 940                         goto err_submit;
 941                 }
 942
 943                 /*
 944                  * Drop reference count.
 945                  * This ensures that the URB is freed when killing them.
 946                  */
 947                 usb_free_urb(urb);
 948         }
 949
 950         return 0;
 951
 952 err_submit:
 953         kfree_skb(skb);
 954 err_skb:
 955         usb_free_urb(urb);
 956 err_urb:
 957         kfree(rx_buf);
 958 err_rxb:
 959         ath9k_hif_usb_dealloc_rx_urbs(hif_dev);
 960         return ret;
 961 }
 962
 963 static void ath9k_hif_usb_dealloc_reg_in_urbs(struct hif_device_usb *hif_dev)
 964 {
 965         usb_kill_anchored_urbs(&hif_dev->reg_in_submitted);
 966 }
 967
 968 static int ath9k_hif_usb_alloc_reg_in_urbs(struct hif_device_usb *hif_dev)
 969 {
 970         struct rx_buf *rx_buf = NULL;
 971         struct sk_buff *skb = NULL;
 972         struct urb *urb = NULL;
 973         int i, ret;
 974
 975         init_usb_anchor(&hif_dev->reg_in_submitted);
 976
 977         for (i = 0; i < MAX_REG_IN_URB_NUM; i++) {
 978
 979                 rx_buf = kzalloc(sizeof(*rx_buf), GFP_KERNEL);
 980                 if (!rx_buf) {
 981                         ret = -ENOMEM;
 982                         goto err_rxb;
 983                 }
 984
 985                 /* Allocate URB */
 986                 urb = usb_alloc_urb(0, GFP_KERNEL);
 987                 if (urb == NULL) {
 988                         ret = -ENOMEM;
 989                         goto err_urb;
 990                 }
 991
 992                 /* Allocate buffer */
 993                 skb = alloc_skb(MAX_REG_IN_BUF_SIZE, GFP_KERNEL);
 994                 if (!skb) {
 995                         ret = -ENOMEM;
 996                         goto err_skb;
 997                 }
 998
 999                 rx_buf->hif_dev = hif_dev;
1000                 rx_buf->skb = skb;
1001
1002                 usb_fill_int_urb(urb, hif_dev->udev,
1003                                   usb_rcvintpipe(hif_dev->udev,
1004                                                   USB_REG_IN_PIPE),
1005                                   skb->data, MAX_REG_IN_BUF_SIZE,
1006                                   ath9k_hif_usb_reg_in_cb, rx_buf, 1);
1007
1008                 /* Anchor URB */
1009                 usb_anchor_urb(urb, &hif_dev->reg_in_submitted);
1010
1011                 /* Submit URB */
1012                 ret = usb_submit_urb(urb, GFP_KERNEL);
1013                 if (ret) {
1014                         usb_unanchor_urb(urb);
1015                         goto err_submit;
1016                 }
1017
1018                 /*
1019                  * Drop reference count.
1020                  * This ensures that the URB is freed when killing them.
1021                  */
1022                 usb_free_urb(urb);
1023         }
1024
1025         return 0;
1026
1027 err_submit:
1028         kfree_skb(skb);
1029 err_skb:
1030         usb_free_urb(urb);
1031 err_urb:
1032         kfree(rx_buf);
1033 err_rxb:
1034         ath9k_hif_usb_dealloc_reg_in_urbs(hif_dev);
1035         return ret;
1036 }
1037
1038 static int ath9k_hif_usb_alloc_urbs(struct hif_device_usb *hif_dev)
1039 {
1040         /* Register Write */
1041         init_usb_anchor(&hif_dev->regout_submitted);
1042
1043         /* TX */
1044         if (ath9k_hif_usb_alloc_tx_urbs(hif_dev) < 0)
1045                 goto err;
1046
1047         /* RX */
1048         if (ath9k_hif_usb_alloc_rx_urbs(hif_dev) < 0)
1049                 goto err_rx;
1050
1051         /* Register Read */
1052         if (ath9k_hif_usb_alloc_reg_in_urbs(hif_dev) < 0)
1053                 goto err_reg;
1054
1055         return 0;
1056 err_reg:
1057         ath9k_hif_usb_dealloc_rx_urbs(hif_dev);
1058 err_rx:
1059         ath9k_hif_usb_dealloc_tx_urbs(hif_dev);
1060 err:
1061         return -ENOMEM;
1062 }
1063
1064 void ath9k_hif_usb_dealloc_urbs(struct hif_device_usb *hif_dev)
1065 {
1066         usb_kill_anchored_urbs(&hif_dev->regout_submitted);
1067         ath9k_hif_usb_dealloc_reg_in_urbs(hif_dev);
1068         ath9k_hif_usb_dealloc_tx_urbs(hif_dev);
1069         ath9k_hif_usb_dealloc_rx_urbs(hif_dev);
1070 }
1071
1072 static int ath9k_hif_usb_download_fw(struct hif_device_usb *hif_dev)
1073 {
1074         int transfer, err;
1075         const void *data = hif_dev->fw_data;
1076         size_t len = hif_dev->fw_size;
1077         u32 addr = AR9271_FIRMWARE;
1078         u8 *buf = kzalloc(4096, GFP_KERNEL);
1079         u32 firm_offset;
1080
1081         if (!buf)
1082                 return -ENOMEM;
1083
1084         while (len) {
1085                 transfer = min_t(size_t, len, 4096);
1086                 memcpy(buf, data, transfer);
1087
1088                 err = usb_control_msg(hif_dev->udev,
1089                                       usb_sndctrlpipe(hif_dev->udev, 0),
1090                                       FIRMWARE_DOWNLOAD, 0x40 | USB_DIR_OUT,
1091                                       addr >> 8, 0, buf, transfer,
1092                                       USB_MSG_TIMEOUT);
1093                 if (err < 0) {
1094                         kfree(buf);
1095                         return err;
1096                 }
1097
1098                 len -= transfer;
1099                 data += transfer;
1100                 addr += transfer;
1101         }
1102         kfree(buf);
1103
1104         if (IS_AR7010_DEVICE(hif_dev->usb_device_id->driver_info))
1105                 firm_offset = AR7010_FIRMWARE_TEXT;
1106         else
1107                 firm_offset = AR9271_FIRMWARE_TEXT;
1108
1109         /*
1110          * Issue FW download complete command to firmware.
1111          */
1112         err = usb_control_msg(hif_dev->udev, usb_sndctrlpipe(hif_dev->udev, 0),
1113                               FIRMWARE_DOWNLOAD_COMP,
1114                               0x40 | USB_DIR_OUT,
1115                               firm_offset >> 8, 0, NULL, 0, USB_MSG_TIMEOUT);
1116         if (err)
1117                 return -EIO;
1118
1119         dev_info(&hif_dev->udev->dev, "ath9k_htc: Transferred FW: %s, size: %ld\n",
1120                  hif_dev->fw_name, (unsigned long) hif_dev->fw_size);
1121
1122         return 0;
1123 }
1124
1125 static int ath9k_hif_usb_dev_init(struct hif_device_usb *hif_dev)
1126 {
1127         int ret;
1128
1129         ret = ath9k_hif_usb_download_fw(hif_dev);
1130         if (ret) {
1131                 dev_err(&hif_dev->udev->dev,
1132                         "ath9k_htc: Firmware - %s download failed\n",
1133                         hif_dev->fw_name);
1134                 return ret;
1135         }
1136
1137         /* Alloc URBs */
1138         ret = ath9k_hif_usb_alloc_urbs(hif_dev);
1139         if (ret) {
1140                 dev_err(&hif_dev->udev->dev,
1141                         "ath9k_htc: Unable to allocate URBs\n");
1142                 return ret;
1143         }
1144
1145         return 0;
1146 }
1147
1148 static void ath9k_hif_usb_dev_deinit(struct hif_device_usb *hif_dev)
1149 {
1150         ath9k_hif_usb_dealloc_urbs(hif_dev);
1151 }
1152
1153 /*
1154  * If initialization fails or the FW cannot be retrieved,
1155  * detach the device.
1156  */
1157 static void ath9k_hif_usb_firmware_fail(struct hif_device_usb *hif_dev)
1158 {
1159         struct device *dev = &hif_dev->udev->dev;
1160         struct device *parent = dev->parent;
1161
1162         complete_all(&hif_dev->fw_done);
1163
1164         if (parent)
1165                 device_lock(parent);
1166
1167         device_release_driver(dev);
1168
1169         if (parent)
1170                 device_unlock(parent);
1171 }
1172
1173 static void ath9k_hif_usb_firmware_cb(const struct firmware *fw, void *context);
1174
1175 /* taken from iwlwifi */
1176 static int ath9k_hif_request_firmware(struct hif_device_usb *hif_dev,
1177                                       bool first)
1178 {
1179         char index[8], *chip;
1180         int ret;
1181
1182         if (first) {
1183                 if (htc_use_dev_fw) {
1184                         hif_dev->fw_minor_index = FIRMWARE_MINOR_IDX_MAX + 1;
1185                         sprintf(index, "%s", "dev");
1186                 } else {
1187                         hif_dev->fw_minor_index = FIRMWARE_MINOR_IDX_MAX;
1188                         sprintf(index, "%d", hif_dev->fw_minor_index);
1189                 }
1190         } else {
1191                 hif_dev->fw_minor_index--;
1192                 sprintf(index, "%d", hif_dev->fw_minor_index);
1193         }
1194
1195         /* test for FW 1.3 */
1196         if (MAJOR_VERSION_REQ == 1 && hif_dev->fw_minor_index == 3) {
1197                 const char *filename;
1198
1199                 if (IS_AR7010_DEVICE(hif_dev->usb_device_id->driver_info))
1200                         filename = FIRMWARE_AR7010_1_1;
1201                 else
1202                         filename = FIRMWARE_AR9271;
1203
1204                 /* expected fw locations:
1205                  * - htc_9271.fw   (stable version 1.3, depricated)
1206                  */
1207                 snprintf(hif_dev->fw_name, sizeof(hif_dev->fw_name),
1208                          "%s", filename);
1209
1210         } else if (hif_dev->fw_minor_index < FIRMWARE_MINOR_IDX_MIN) {
1211                 dev_err(&hif_dev->udev->dev, "no suitable firmware found!\n");
1212
1213                 return -ENOENT;
1214         } else {
1215                 if (IS_AR7010_DEVICE(hif_dev->usb_device_id->driver_info))
1216                         chip = "7010";
1217                 else
1218                         chip = "9271";
1219
1220                 /* expected fw locations:
1221                  * - ath9k_htc/htc_9271-1.dev.0.fw (development version)
1222                  * - ath9k_htc/htc_9271-1.4.0.fw   (stable version)
1223                  */
1224                 snprintf(hif_dev->fw_name, sizeof(hif_dev->fw_name),
1225                          "%s/htc_%s-%d.%s.0.fw", HTC_FW_PATH,
1226                          chip, MAJOR_VERSION_REQ, index);
1227         }
1228
1229         ret = request_firmware_nowait(THIS_MODULE, true, hif_dev->fw_name,
1230                                       &hif_dev->udev->dev, GFP_KERNEL,
1231                                       hif_dev, ath9k_hif_usb_firmware_cb);
1232         if (ret) {
1233                 dev_err(&hif_dev->udev->dev,
1234                         "ath9k_htc: Async request for firmware %s failed\n",
1235                         hif_dev->fw_name);
1236                 return ret;
1237         }
1238
1239         dev_info(&hif_dev->udev->dev, "ath9k_htc: Firmware %s requested\n",
1240                  hif_dev->fw_name);
1241
1242         return ret;
1243 }
1244
1245 static void ath9k_hif_usb_firmware_cb(const struct firmware *fw, void *context)
1246 {
1247         struct hif_device_usb *hif_dev = context;
1248         int ret;
1249
1250         if (!fw) {
1251                 ret = ath9k_hif_request_firmware(hif_dev, false);
1252                 if (!ret)
1253                         return;
1254
1255                 dev_err(&hif_dev->udev->dev,
1256                         "ath9k_htc: Failed to get firmware %s\n",
1257                         hif_dev->fw_name);
1258                 goto err_fw;
1259         }
1260
1261         hif_dev->htc_handle = ath9k_htc_hw_alloc(hif_dev, &hif_usb,
1262                                                  &hif_dev->udev->dev);
1263         if (hif_dev->htc_handle == NULL)
1264                 goto err_dev_alloc;
1265
1266         hif_dev->fw_data = fw->data;
1267         hif_dev->fw_size = fw->size;
1268
1269         /* Proceed with initialization */
1270
1271         ret = ath9k_hif_usb_dev_init(hif_dev);
1272         if (ret)
1273                 goto err_dev_init;
1274
1275         ret = ath9k_htc_hw_init(hif_dev->htc_handle,
1276                                 &hif_dev->interface->dev,
1277                                 hif_dev->usb_device_id->idProduct,
1278                                 hif_dev->udev->product,
1279                                 hif_dev->usb_device_id->driver_info);
1280         if (ret) {
1281                 ret = -EINVAL;
1282                 goto err_htc_hw_init;
1283         }
1284
1285         release_firmware(fw);
1286         hif_dev->flags |= HIF_USB_READY;
1287         complete_all(&hif_dev->fw_done);
1288
1289         return;
1290
1291 err_htc_hw_init:
1292         ath9k_hif_usb_dev_deinit(hif_dev);
1293 err_dev_init:
1294         ath9k_htc_hw_free(hif_dev->htc_handle);
1295 err_dev_alloc:
1296         release_firmware(fw);
1297 err_fw:
1298         ath9k_hif_usb_firmware_fail(hif_dev);
1299 }
1300
1301 /*
1302  * An exact copy of the function from zd1211rw.
1303  */
1304 static int send_eject_command(struct usb_interface *interface)
1305 {
1306         struct usb_device *udev = interface_to_usbdev(interface);
1307         struct usb_host_interface *iface_desc = interface->cur_altsetting;
1308         struct usb_endpoint_descriptor *endpoint;
1309         unsigned char *cmd;
1310         u8 bulk_out_ep;
1311         int r;
1312
1313         if (iface_desc->desc.bNumEndpoints < 2)
1314                 return -ENODEV;
1315
1316         /* Find bulk out endpoint */
1317         for (r = 1; r >= 0; r--) {
1318                 endpoint = &iface_desc->endpoint[r].desc;
1319                 if (usb_endpoint_dir_out(endpoint) &&
1320                     usb_endpoint_xfer_bulk(endpoint)) {
1321                         bulk_out_ep = endpoint->bEndpointAddress;
1322                         break;
1323                 }
1324         }
1325         if (r == -1) {
1326                 dev_err(&udev->dev,
1327                         "ath9k_htc: Could not find bulk out endpoint\n");
1328                 return -ENODEV;
1329         }
1330
1331         cmd = kzalloc(31, GFP_KERNEL);
1332         if (cmd == NULL)
1333                 return -ENODEV;
1334
1335         /* USB bulk command block */
1336         cmd[0] = 0x55;  /* bulk command signature */
1337         cmd[1] = 0x53;  /* bulk command signature */
1338         cmd[2] = 0x42;  /* bulk command signature */
1339         cmd[3] = 0x43;  /* bulk command signature */
1340         cmd[14] = 6;    /* command length */
1341
1342         cmd[15] = 0x1b; /* SCSI command: START STOP UNIT */
1343         cmd[19] = 0x2;  /* eject disc */
1344
1345         dev_info(&udev->dev, "Ejecting storage device...\n");
1346         r = usb_bulk_msg(udev, usb_sndbulkpipe(udev, bulk_out_ep),
1347                 cmd, 31, NULL, 2 * USB_MSG_TIMEOUT);
1348         kfree(cmd);
1349         if (r)
1350                 return r;
1351
1352         /* At this point, the device disconnects and reconnects with the real
1353          * ID numbers. */
1354
1355         usb_set_intfdata(interface, NULL);
1356         return 0;
1357 }
1358
1359 static int ath9k_hif_usb_probe(struct usb_interface *interface,
1360                                const struct usb_device_id *id)
1361 {
1362         struct usb_endpoint_descriptor *bulk_in, *bulk_out, *int_in, *int_out;
1363         struct usb_device *udev = interface_to_usbdev(interface);
1364         struct usb_host_interface *alt;
1365         struct hif_device_usb *hif_dev;
1366         int ret = 0;
1367
1368         /* Verify the expected endpoints are present */
1369         alt = interface->cur_altsetting;
1370         if (usb_find_common_endpoints(alt, &bulk_in, &bulk_out, &int_in, &int_out) < 0 ||
1371             usb_endpoint_num(bulk_in) != USB_WLAN_RX_PIPE ||
1372             usb_endpoint_num(bulk_out) != USB_WLAN_TX_PIPE ||
1373             usb_endpoint_num(int_in) != USB_REG_IN_PIPE ||
1374             usb_endpoint_num(int_out) != USB_REG_OUT_PIPE) {
1375                 dev_err(&udev->dev,
1376                         "ath9k_htc: Device endpoint numbers are not the expected ones\n");
1377                 return -ENODEV;
1378         }
1379
1380         if (id->driver_info == STORAGE_DEVICE)
1381                 return send_eject_command(interface);
1382
1383         hif_dev = kzalloc(sizeof(struct hif_device_usb), GFP_KERNEL);
1384         if (!hif_dev) {
1385                 ret = -ENOMEM;
1386                 goto err_alloc;
1387         }
1388
1389         usb_get_dev(udev);
1390
1391         hif_dev->udev = udev;
1392         hif_dev->interface = interface;
1393         hif_dev->usb_device_id = id;
1394 #ifdef CONFIG_PM
1395         udev->reset_resume = 1;
1396 #endif
1397         usb_set_intfdata(interface, hif_dev);
1398
1399         init_completion(&hif_dev->fw_done);
1400
1401         ret = ath9k_hif_request_firmware(hif_dev, true);
1402         if (ret)
1403                 goto err_fw_req;
1404
1405         return ret;
1406
1407 err_fw_req:
1408         usb_set_intfdata(interface, NULL);
1409         kfree(hif_dev);
1410         usb_put_dev(udev);
1411 err_alloc:
1412         return ret;
1413 }
1414
1415 static void ath9k_hif_usb_reboot(struct usb_device *udev)
1416 {
1417         u32 reboot_cmd = 0xffffffff;
1418         void *buf;
1419         int ret;
1420
1421         buf = kmemdup(&reboot_cmd, 4, GFP_KERNEL);
1422         if (!buf)
1423                 return;
1424
1425         ret = usb_interrupt_msg(udev, usb_sndintpipe(udev, USB_REG_OUT_PIPE),
1426                            buf, 4, NULL, USB_MSG_TIMEOUT);
1427         if (ret)
1428                 dev_err(&udev->dev, "ath9k_htc: USB reboot failed\n");
1429
1430         kfree(buf);
1431 }
1432
1433 static void ath9k_hif_usb_disconnect(struct usb_interface *interface)
1434 {
1435         struct usb_device *udev = interface_to_usbdev(interface);
1436         struct hif_device_usb *hif_dev = usb_get_intfdata(interface);
1437         bool unplugged = (udev->state == USB_STATE_NOTATTACHED) ? true : false;
1438
1439         if (!hif_dev)
1440                 return;
1441
1442         wait_for_completion(&hif_dev->fw_done);
1443
1444         if (hif_dev->flags & HIF_USB_READY) {
1445                 ath9k_htc_hw_deinit(hif_dev->htc_handle, unplugged);
1446                 ath9k_hif_usb_dev_deinit(hif_dev);
1447                 ath9k_destoy_wmi(hif_dev->htc_handle->drv_priv);
1448                 ath9k_htc_hw_free(hif_dev->htc_handle);
1449         }
1450
1451         usb_set_intfdata(interface, NULL);
1452
1453         /* If firmware was loaded we should drop it
1454          * go back to first stage bootloader. */
1455         if (!unplugged && (hif_dev->flags & HIF_USB_READY))
1456                 ath9k_hif_usb_reboot(udev);
1457
1458         kfree(hif_dev);
1459         dev_info(&udev->dev, "ath9k_htc: USB layer deinitialized\n");
1460         usb_put_dev(udev);
1461 }
1462
1463 #ifdef CONFIG_PM
1464 static int ath9k_hif_usb_suspend(struct usb_interface *interface,
1465                                  pm_message_t message)
1466 {
1467         struct hif_device_usb *hif_dev = usb_get_intfdata(interface);
1468
1469         /*
1470          * The device has to be set to FULLSLEEP mode in case no
1471          * interface is up.
1472          */
1473         if (!(hif_dev->flags & HIF_USB_START))
1474                 ath9k_htc_suspend(hif_dev->htc_handle);
1475
1476         wait_for_completion(&hif_dev->fw_done);
1477
1478         if (hif_dev->flags & HIF_USB_READY)
1479                 ath9k_hif_usb_dealloc_urbs(hif_dev);
1480
1481         return 0;
1482 }
1483
1484 static int ath9k_hif_usb_resume(struct usb_interface *interface)
1485 {
1486         struct hif_device_usb *hif_dev = usb_get_intfdata(interface);
1487         struct htc_target *htc_handle = hif_dev->htc_handle;
1488         int ret;
1489         const struct firmware *fw;
1490
1491         ret = ath9k_hif_usb_alloc_urbs(hif_dev);
1492         if (ret)
1493                 return ret;
1494
1495         if (hif_dev->flags & HIF_USB_READY) {
1496                 /* request cached firmware during suspend/resume cycle */
1497                 ret = request_firmware(&fw, hif_dev->fw_name,
1498                                        &hif_dev->udev->dev);
1499                 if (ret)
1500                         goto fail_resume;
1501
1502                 hif_dev->fw_data = fw->data;
1503                 hif_dev->fw_size = fw->size;
1504                 ret = ath9k_hif_usb_download_fw(hif_dev);
1505                 release_firmware(fw);
1506                 if (ret)
1507                         goto fail_resume;
1508         } else {
1509                 ath9k_hif_usb_dealloc_urbs(hif_dev);
1510                 return -EIO;
1511         }
1512
1513         mdelay(100);
1514
1515         ret = ath9k_htc_resume(htc_handle);
1516
1517         if (ret)
1518                 goto fail_resume;
1519
1520         return 0;
1521
1522 fail_resume:
1523         ath9k_hif_usb_dealloc_urbs(hif_dev);
1524
1525         return ret;
1526 }
1527 #endif
1528
1529 static struct usb_driver ath9k_hif_usb_driver = {
1530         .name = KBUILD_MODNAME,
1531         .probe = ath9k_hif_usb_probe,
1532         .disconnect = ath9k_hif_usb_disconnect,
1533 #ifdef CONFIG_PM
1534         .suspend = ath9k_hif_usb_suspend,
1535         .resume = ath9k_hif_usb_resume,
1536         .reset_resume = ath9k_hif_usb_resume,
1537 #endif
1538         .id_table = ath9k_hif_usb_ids,
1539         .soft_unbind = 1,
1540         .disable_hub_initiated_lpm = 1,
1541 };
1542
1543 int ath9k_hif_usb_init(void)
1544 {
1545         return usb_register(&ath9k_hif_usb_driver);
1546 }
1547
1548 void ath9k_hif_usb_exit(void)
1549 {
1550         usb_deregister(&ath9k_hif_usb_driver);
1551 }