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

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