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