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

   1 /*
   2  * Copyright (c) 2010 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 "htc.h"
  18
  19 /* identify firmware images */
  20 #define FIRMWARE_AR7010         "ar7010.fw"
  21 #define FIRMWARE_AR7010_1_1     "ar7010_1_1.fw"
  22 #define FIRMWARE_AR9271         "ar9271.fw"
  23
  24 MODULE_FIRMWARE(FIRMWARE_AR7010);
  25 MODULE_FIRMWARE(FIRMWARE_AR7010_1_1);
  26 MODULE_FIRMWARE(FIRMWARE_AR9271);
  27
  28 static struct usb_device_id ath9k_hif_usb_ids[] = {
  29         { USB_DEVICE(0x0cf3, 0x9271) }, /* Atheros */
  30         { USB_DEVICE(0x0cf3, 0x1006) }, /* Atheros */
  31         { USB_DEVICE(0x0846, 0x9030) }, /* Netgear N150 */
  32         { USB_DEVICE(0x07D1, 0x3A10) }, /* Dlink Wireless 150 */
  33         { USB_DEVICE(0x13D3, 0x3327) }, /* Azurewave */
  34         { USB_DEVICE(0x13D3, 0x3328) }, /* Azurewave */
  35         { USB_DEVICE(0x13D3, 0x3346) }, /* IMC Networks */
  36         { USB_DEVICE(0x13D3, 0x3348) }, /* Azurewave */
  37         { USB_DEVICE(0x13D3, 0x3349) }, /* Azurewave */
  38         { USB_DEVICE(0x13D3, 0x3350) }, /* Azurewave */
  39         { USB_DEVICE(0x04CA, 0x4605) }, /* Liteon */
  40         { USB_DEVICE(0x040D, 0x3801) }, /* VIA */
  41         { USB_DEVICE(0x0cf3, 0xb003) }, /* Ubiquiti WifiStation Ext */
  42
  43         { USB_DEVICE(0x0cf3, 0x7015),
  44           .driver_info = AR9287_USB },  /* Atheros */
  45         { USB_DEVICE(0x1668, 0x1200),
  46           .driver_info = AR9287_USB },  /* Verizon */
  47
  48         { USB_DEVICE(0x0cf3, 0x7010),
  49           .driver_info = AR9280_USB },  /* Atheros */
  50         { USB_DEVICE(0x0846, 0x9018),
  51           .driver_info = AR9280_USB },  /* Netgear WNDA3200 */
  52         { USB_DEVICE(0x083A, 0xA704),
  53           .driver_info = AR9280_USB },  /* SMC Networks */
  54
  55         { USB_DEVICE(0x0cf3, 0x20ff),
  56           .driver_info = STORAGE_DEVICE },
  57
  58         { },
  59 };
  60
  61 MODULE_DEVICE_TABLE(usb, ath9k_hif_usb_ids);
  62
  63 static int __hif_usb_tx(struct hif_device_usb *hif_dev);
  64
  65 static void hif_usb_regout_cb(struct urb *urb)
  66 {
  67         struct cmd_buf *cmd = (struct cmd_buf *)urb->context;
  68
  69         switch (urb->status) {
  70         case 0:
  71                 break;
  72         case -ENOENT:
  73         case -ECONNRESET:
  74         case -ENODEV:
  75         case -ESHUTDOWN:
  76                 goto free;
  77         default:
  78                 break;
  79         }
  80
  81         if (cmd) {
  82                 ath9k_htc_txcompletion_cb(cmd->hif_dev->htc_handle,
  83                                           cmd->skb, 1);
  84                 kfree(cmd);
  85         }
  86
  87         return;
  88 free:
  89         kfree_skb(cmd->skb);
  90         kfree(cmd);
  91 }
  92
  93 static int hif_usb_send_regout(struct hif_device_usb *hif_dev,
  94                                struct sk_buff *skb)
  95 {
  96         struct urb *urb;
  97         struct cmd_buf *cmd;
  98         int ret = 0;
  99
 100         urb = usb_alloc_urb(0, GFP_KERNEL);
 101         if (urb == NULL)
 102                 return -ENOMEM;
 103
 104         cmd = kzalloc(sizeof(*cmd), GFP_KERNEL);
 105         if (cmd == NULL) {
 106                 usb_free_urb(urb);
 107                 return -ENOMEM;
 108         }
 109
 110         cmd->skb = skb;
 111         cmd->hif_dev = hif_dev;
 112
 113         usb_fill_bulk_urb(urb, hif_dev->udev,
 114                          usb_sndbulkpipe(hif_dev->udev, USB_REG_OUT_PIPE),
 115                          skb->data, skb->len,
 116                          hif_usb_regout_cb, cmd);
 117
 118         usb_anchor_urb(urb, &hif_dev->regout_submitted);
 119         ret = usb_submit_urb(urb, GFP_KERNEL);
 120         if (ret) {
 121                 usb_unanchor_urb(urb);
 122                 kfree(cmd);
 123         }
 124         usb_free_urb(urb);
 125
 126         return ret;
 127 }
 128
 129 static inline void ath9k_skb_queue_purge(struct hif_device_usb *hif_dev,
 130                                          struct sk_buff_head *list)
 131 {
 132         struct sk_buff *skb;
 133
 134         while ((skb = __skb_dequeue(list)) != NULL) {
 135                 dev_kfree_skb_any(skb);
 136                 TX_STAT_INC(skb_dropped);
 137         }
 138 }
 139
 140 static void hif_usb_tx_cb(struct urb *urb)
 141 {
 142         struct tx_buf *tx_buf = (struct tx_buf *) urb->context;
 143         struct hif_device_usb *hif_dev;
 144         struct sk_buff *skb;
 145
 146         if (!tx_buf || !tx_buf->hif_dev)
 147                 return;
 148
 149         hif_dev = tx_buf->hif_dev;
 150
 151         switch (urb->status) {
 152         case 0:
 153                 break;
 154         case -ENOENT:
 155         case -ECONNRESET:
 156         case -ENODEV:
 157         case -ESHUTDOWN:
 158                 /*
 159                  * The URB has been killed, free the SKBs.
 160                  */
 161                 ath9k_skb_queue_purge(hif_dev, &tx_buf->skb_queue);
 162
 163                 /*
 164                  * If the URBs are being flushed, no need to add this
 165                  * URB to the free list.
 166                  */
 167                 spin_lock(&hif_dev->tx.tx_lock);
 168                 if (hif_dev->tx.flags & HIF_USB_TX_FLUSH) {
 169                         spin_unlock(&hif_dev->tx.tx_lock);
 170                         return;
 171                 }
 172                 spin_unlock(&hif_dev->tx.tx_lock);
 173
 174                 /*
 175                  * In the stop() case, this URB has to be added to
 176                  * the free list.
 177                  */
 178                 goto add_free;
 179         default:
 180                 break;
 181         }
 182
 183         /*
 184          * Check if TX has been stopped, this is needed because
 185          * this CB could have been invoked just after the TX lock
 186          * was released in hif_stop() and kill_urb() hasn't been
 187          * called yet.
 188          */
 189         spin_lock(&hif_dev->tx.tx_lock);
 190         if (hif_dev->tx.flags & HIF_USB_TX_STOP) {
 191                 spin_unlock(&hif_dev->tx.tx_lock);
 192                 ath9k_skb_queue_purge(hif_dev, &tx_buf->skb_queue);
 193                 goto add_free;
 194         }
 195         spin_unlock(&hif_dev->tx.tx_lock);
 196
 197         /* Complete the queued SKBs. */
 198         while ((skb = __skb_dequeue(&tx_buf->skb_queue)) != NULL) {
 199                 ath9k_htc_txcompletion_cb(hif_dev->htc_handle,
 200                                           skb, 1);
 201                 TX_STAT_INC(skb_completed);
 202         }
 203
 204 add_free:
 205         /* Re-initialize the SKB queue */
 206         tx_buf->len = tx_buf->offset = 0;
 207         __skb_queue_head_init(&tx_buf->skb_queue);
 208
 209         /* Add this TX buffer to the free list */
 210         spin_lock(&hif_dev->tx.tx_lock);
 211         list_move_tail(&tx_buf->list, &hif_dev->tx.tx_buf);
 212         hif_dev->tx.tx_buf_cnt++;
 213         if (!(hif_dev->tx.flags & HIF_USB_TX_STOP))
 214                 __hif_usb_tx(hif_dev); /* Check for pending SKBs */
 215         TX_STAT_INC(buf_completed);
 216         spin_unlock(&hif_dev->tx.tx_lock);
 217 }
 218
 219 /* TX lock has to be taken */
 220 static int __hif_usb_tx(struct hif_device_usb *hif_dev)
 221 {
 222         struct tx_buf *tx_buf = NULL;
 223         struct sk_buff *nskb = NULL;
 224         int ret = 0, i;
 225         u16 *hdr, tx_skb_cnt = 0;
 226         u8 *buf;
 227
 228         if (hif_dev->tx.tx_skb_cnt == 0)
 229                 return 0;
 230
 231         /* Check if a free TX buffer is available */
 232         if (list_empty(&hif_dev->tx.tx_buf))
 233                 return 0;
 234
 235         tx_buf = list_first_entry(&hif_dev->tx.tx_buf, struct tx_buf, list);
 236         list_move_tail(&tx_buf->list, &hif_dev->tx.tx_pending);
 237         hif_dev->tx.tx_buf_cnt--;
 238
 239         tx_skb_cnt = min_t(u16, hif_dev->tx.tx_skb_cnt, MAX_TX_AGGR_NUM);
 240
 241         for (i = 0; i < tx_skb_cnt; i++) {
 242                 nskb = __skb_dequeue(&hif_dev->tx.tx_skb_queue);
 243
 244                 /* Should never be NULL */
 245                 BUG_ON(!nskb);
 246
 247                 hif_dev->tx.tx_skb_cnt--;
 248
 249                 buf = tx_buf->buf;
 250                 buf += tx_buf->offset;
 251                 hdr = (u16 *)buf;
 252                 *hdr++ = nskb->len;
 253                 *hdr++ = ATH_USB_TX_STREAM_MODE_TAG;
 254                 buf += 4;
 255                 memcpy(buf, nskb->data, nskb->len);
 256                 tx_buf->len = nskb->len + 4;
 257
 258                 if (i < (tx_skb_cnt - 1))
 259                         tx_buf->offset += (((tx_buf->len - 1) / 4) + 1) * 4;
 260
 261                 if (i == (tx_skb_cnt - 1))
 262                         tx_buf->len += tx_buf->offset;
 263
 264                 __skb_queue_tail(&tx_buf->skb_queue, nskb);
 265                 TX_STAT_INC(skb_queued);
 266         }
 267
 268         usb_fill_bulk_urb(tx_buf->urb, hif_dev->udev,
 269                           usb_sndbulkpipe(hif_dev->udev, USB_WLAN_TX_PIPE),
 270                           tx_buf->buf, tx_buf->len,
 271                           hif_usb_tx_cb, tx_buf);
 272
 273         ret = usb_submit_urb(tx_buf->urb, GFP_ATOMIC);
 274         if (ret) {
 275                 tx_buf->len = tx_buf->offset = 0;
 276                 ath9k_skb_queue_purge(hif_dev, &tx_buf->skb_queue);
 277                 __skb_queue_head_init(&tx_buf->skb_queue);
 278                 list_move_tail(&tx_buf->list, &hif_dev->tx.tx_buf);
 279                 hif_dev->tx.tx_buf_cnt++;
 280         }
 281
 282         if (!ret)
 283                 TX_STAT_INC(buf_queued);
 284
 285         return ret;
 286 }
 287
 288 static int hif_usb_send_tx(struct hif_device_usb *hif_dev, struct sk_buff *skb,
 289                            struct ath9k_htc_tx_ctl *tx_ctl)
 290 {
 291         unsigned long flags;
 292
 293         spin_lock_irqsave(&hif_dev->tx.tx_lock, flags);
 294
 295         if (hif_dev->tx.flags & HIF_USB_TX_STOP) {
 296                 spin_unlock_irqrestore(&hif_dev->tx.tx_lock, flags);
 297                 return -ENODEV;
 298         }
 299
 300         /* Check if the max queue count has been reached */
 301         if (hif_dev->tx.tx_skb_cnt > MAX_TX_BUF_NUM) {
 302                 spin_unlock_irqrestore(&hif_dev->tx.tx_lock, flags);
 303                 return -ENOMEM;
 304         }
 305
 306         __skb_queue_tail(&hif_dev->tx.tx_skb_queue, skb);
 307         hif_dev->tx.tx_skb_cnt++;
 308
 309         /* Send normal frames immediately */
 310         if (!tx_ctl || (tx_ctl && (tx_ctl->type == ATH9K_HTC_NORMAL)))
 311                 __hif_usb_tx(hif_dev);
 312
 313         /* Check if AMPDUs have to be sent immediately */
 314         if (tx_ctl && (tx_ctl->type == ATH9K_HTC_AMPDU) &&
 315             (hif_dev->tx.tx_buf_cnt == MAX_TX_URB_NUM) &&
 316             (hif_dev->tx.tx_skb_cnt < 2)) {
 317                 __hif_usb_tx(hif_dev);
 318         }
 319
 320         spin_unlock_irqrestore(&hif_dev->tx.tx_lock, flags);
 321
 322         return 0;
 323 }
 324
 325 static void hif_usb_start(void *hif_handle, u8 pipe_id)
 326 {
 327         struct hif_device_usb *hif_dev = (struct hif_device_usb *)hif_handle;
 328         unsigned long flags;
 329
 330         hif_dev->flags |= HIF_USB_START;
 331
 332         spin_lock_irqsave(&hif_dev->tx.tx_lock, flags);
 333         hif_dev->tx.flags &= ~HIF_USB_TX_STOP;
 334         spin_unlock_irqrestore(&hif_dev->tx.tx_lock, flags);
 335 }
 336
 337 static void hif_usb_stop(void *hif_handle, u8 pipe_id)
 338 {
 339         struct hif_device_usb *hif_dev = (struct hif_device_usb *)hif_handle;
 340         struct tx_buf *tx_buf = NULL, *tx_buf_tmp = NULL;
 341         unsigned long flags;
 342
 343         spin_lock_irqsave(&hif_dev->tx.tx_lock, flags);
 344         ath9k_skb_queue_purge(hif_dev, &hif_dev->tx.tx_skb_queue);
 345         hif_dev->tx.tx_skb_cnt = 0;
 346         hif_dev->tx.flags |= HIF_USB_TX_STOP;
 347         spin_unlock_irqrestore(&hif_dev->tx.tx_lock, flags);
 348
 349         /* The pending URBs have to be canceled. */
 350         list_for_each_entry_safe(tx_buf, tx_buf_tmp,
 351                                  &hif_dev->tx.tx_pending, list) {
 352                 usb_kill_urb(tx_buf->urb);
 353         }
 354 }
 355
 356 static int hif_usb_send(void *hif_handle, u8 pipe_id, struct sk_buff *skb,
 357                         struct ath9k_htc_tx_ctl *tx_ctl)
 358 {
 359         struct hif_device_usb *hif_dev = (struct hif_device_usb *)hif_handle;
 360         int ret = 0;
 361
 362         switch (pipe_id) {
 363         case USB_WLAN_TX_PIPE:
 364                 ret = hif_usb_send_tx(hif_dev, skb, tx_ctl);
 365                 break;
 366         case USB_REG_OUT_PIPE:
 367                 ret = hif_usb_send_regout(hif_dev, skb);
 368                 break;
 369         default:
 370                 dev_err(&hif_dev->udev->dev,
 371                         "ath9k_htc: Invalid TX pipe: %d\n", pipe_id);
 372                 ret = -EINVAL;
 373                 break;
 374         }
 375
 376         return ret;
 377 }
 378
 379 static struct ath9k_htc_hif hif_usb = {
 380         .transport = ATH9K_HIF_USB,
 381         .name = "ath9k_hif_usb",
 382
 383         .control_ul_pipe = USB_REG_OUT_PIPE,
 384         .control_dl_pipe = USB_REG_IN_PIPE,
 385
 386         .start = hif_usb_start,
 387         .stop = hif_usb_stop,
 388         .send = hif_usb_send,
 389 };
 390
 391 static void ath9k_hif_usb_rx_stream(struct hif_device_usb *hif_dev,
 392                                     struct sk_buff *skb)
 393 {
 394         struct sk_buff *nskb, *skb_pool[MAX_PKT_NUM_IN_TRANSFER];
 395         int index = 0, i = 0, len = skb->len;
 396         int rx_remain_len, rx_pkt_len;
 397         u16 pool_index = 0;
 398         u8 *ptr;
 399
 400         spin_lock(&hif_dev->rx_lock);
 401
 402         rx_remain_len = hif_dev->rx_remain_len;
 403         rx_pkt_len = hif_dev->rx_transfer_len;
 404
 405         if (rx_remain_len != 0) {
 406                 struct sk_buff *remain_skb = hif_dev->remain_skb;
 407
 408                 if (remain_skb) {
 409                         ptr = (u8 *) remain_skb->data;
 410
 411                         index = rx_remain_len;
 412                         rx_remain_len -= hif_dev->rx_pad_len;
 413                         ptr += rx_pkt_len;
 414
 415                         memcpy(ptr, skb->data, rx_remain_len);
 416
 417                         rx_pkt_len += rx_remain_len;
 418                         hif_dev->rx_remain_len = 0;
 419                         skb_put(remain_skb, rx_pkt_len);
 420
 421                         skb_pool[pool_index++] = remain_skb;
 422
 423                 } else {
 424                         index = rx_remain_len;
 425                 }
 426         }
 427
 428         spin_unlock(&hif_dev->rx_lock);
 429
 430         while (index < len) {
 431                 u16 pkt_len;
 432                 u16 pkt_tag;
 433                 u16 pad_len;
 434                 int chk_idx;
 435
 436                 ptr = (u8 *) skb->data;
 437
 438                 pkt_len = ptr[index] + (ptr[index+1] << 8);
 439                 pkt_tag = ptr[index+2] + (ptr[index+3] << 8);
 440
 441                 if (pkt_tag != ATH_USB_RX_STREAM_MODE_TAG) {
 442                         RX_STAT_INC(skb_dropped);
 443                         return;
 444                 }
 445
 446                 pad_len = 4 - (pkt_len & 0x3);
 447                 if (pad_len == 4)
 448                         pad_len = 0;
 449
 450                 chk_idx = index;
 451                 index = index + 4 + pkt_len + pad_len;
 452
 453                 if (index > MAX_RX_BUF_SIZE) {
 454                         spin_lock(&hif_dev->rx_lock);
 455                         hif_dev->rx_remain_len = index - MAX_RX_BUF_SIZE;
 456                         hif_dev->rx_transfer_len =
 457                                 MAX_RX_BUF_SIZE - chk_idx - 4;
 458                         hif_dev->rx_pad_len = pad_len;
 459
 460                         nskb = __dev_alloc_skb(pkt_len + 32, GFP_ATOMIC);
 461                         if (!nskb) {
 462                                 dev_err(&hif_dev->udev->dev,
 463                                         "ath9k_htc: RX memory allocation error\n");
 464                                 spin_unlock(&hif_dev->rx_lock);
 465                                 goto err;
 466                         }
 467                         skb_reserve(nskb, 32);
 468                         RX_STAT_INC(skb_allocated);
 469
 470                         memcpy(nskb->data, &(skb->data[chk_idx+4]),
 471                                hif_dev->rx_transfer_len);
 472
 473                         /* Record the buffer pointer */
 474                         hif_dev->remain_skb = nskb;
 475                         spin_unlock(&hif_dev->rx_lock);
 476                 } else {
 477                         nskb = __dev_alloc_skb(pkt_len + 32, GFP_ATOMIC);
 478                         if (!nskb) {
 479                                 dev_err(&hif_dev->udev->dev,
 480                                         "ath9k_htc: RX memory allocation error\n");
 481                                 goto err;
 482                         }
 483                         skb_reserve(nskb, 32);
 484                         RX_STAT_INC(skb_allocated);
 485
 486                         memcpy(nskb->data, &(skb->data[chk_idx+4]), pkt_len);
 487                         skb_put(nskb, pkt_len);
 488                         skb_pool[pool_index++] = nskb;
 489                 }
 490         }
 491
 492 err:
 493         for (i = 0; i < pool_index; i++) {
 494                 ath9k_htc_rx_msg(hif_dev->htc_handle, skb_pool[i],
 495                                  skb_pool[i]->len, USB_WLAN_RX_PIPE);
 496                 RX_STAT_INC(skb_completed);
 497         }
 498 }
 499
 500 static void ath9k_hif_usb_rx_cb(struct urb *urb)
 501 {
 502         struct sk_buff *skb = (struct sk_buff *) urb->context;
 503         struct hif_device_usb *hif_dev =
 504                 usb_get_intfdata(usb_ifnum_to_if(urb->dev, 0));
 505         int ret;
 506
 507         if (!skb)
 508                 return;
 509
 510         if (!hif_dev)
 511                 goto free;
 512
 513         switch (urb->status) {
 514         case 0:
 515                 break;
 516         case -ENOENT:
 517         case -ECONNRESET:
 518         case -ENODEV:
 519         case -ESHUTDOWN:
 520                 goto free;
 521         default:
 522                 goto resubmit;
 523         }
 524
 525         if (likely(urb->actual_length != 0)) {
 526                 skb_put(skb, urb->actual_length);
 527                 ath9k_hif_usb_rx_stream(hif_dev, skb);
 528         }
 529
 530 resubmit:
 531         skb_reset_tail_pointer(skb);
 532         skb_trim(skb, 0);
 533
 534         usb_anchor_urb(urb, &hif_dev->rx_submitted);
 535         ret = usb_submit_urb(urb, GFP_ATOMIC);
 536         if (ret) {
 537                 usb_unanchor_urb(urb);
 538                 goto free;
 539         }
 540
 541         return;
 542 free:
 543         kfree_skb(skb);
 544 }
 545
 546 static void ath9k_hif_usb_reg_in_cb(struct urb *urb)
 547 {
 548         struct sk_buff *skb = (struct sk_buff *) urb->context;
 549         struct sk_buff *nskb;
 550         struct hif_device_usb *hif_dev =
 551                 usb_get_intfdata(usb_ifnum_to_if(urb->dev, 0));
 552         int ret;
 553
 554         if (!skb)
 555                 return;
 556
 557         if (!hif_dev)
 558                 goto free;
 559
 560         switch (urb->status) {
 561         case 0:
 562                 break;
 563         case -ENOENT:
 564         case -ECONNRESET:
 565         case -ENODEV:
 566         case -ESHUTDOWN:
 567                 goto free;
 568         default:
 569                 goto resubmit;
 570         }
 571
 572         if (likely(urb->actual_length != 0)) {
 573                 skb_put(skb, urb->actual_length);
 574
 575                 /* Process the command first */
 576                 ath9k_htc_rx_msg(hif_dev->htc_handle, skb,
 577                                  skb->len, USB_REG_IN_PIPE);
 578
 579
 580                 nskb = alloc_skb(MAX_REG_IN_BUF_SIZE, GFP_ATOMIC);
 581                 if (!nskb) {
 582                         dev_err(&hif_dev->udev->dev,
 583                                 "ath9k_htc: REG_IN memory allocation failure\n");
 584                         urb->context = NULL;
 585                         return;
 586                 }
 587
 588                 usb_fill_bulk_urb(urb, hif_dev->udev,
 589                                  usb_rcvbulkpipe(hif_dev->udev,
 590                                                  USB_REG_IN_PIPE),
 591                                  nskb->data, MAX_REG_IN_BUF_SIZE,
 592                                  ath9k_hif_usb_reg_in_cb, nskb);
 593
 594                 ret = usb_submit_urb(urb, GFP_ATOMIC);
 595                 if (ret) {
 596                         kfree_skb(nskb);
 597                         urb->context = NULL;
 598                 }
 599
 600                 return;
 601         }
 602
 603 resubmit:
 604         skb_reset_tail_pointer(skb);
 605         skb_trim(skb, 0);
 606
 607         ret = usb_submit_urb(urb, GFP_ATOMIC);
 608         if (ret)
 609                 goto free;
 610
 611         return;
 612 free:
 613         kfree_skb(skb);
 614         urb->context = NULL;
 615 }
 616
 617 static void ath9k_hif_usb_dealloc_tx_urbs(struct hif_device_usb *hif_dev)
 618 {
 619         struct tx_buf *tx_buf = NULL, *tx_buf_tmp = NULL;
 620         unsigned long flags;
 621
 622         list_for_each_entry_safe(tx_buf, tx_buf_tmp,
 623                                  &hif_dev->tx.tx_buf, list) {
 624                 usb_kill_urb(tx_buf->urb);
 625                 list_del(&tx_buf->list);
 626                 usb_free_urb(tx_buf->urb);
 627                 kfree(tx_buf->buf);
 628                 kfree(tx_buf);
 629         }
 630
 631         spin_lock_irqsave(&hif_dev->tx.tx_lock, flags);
 632         hif_dev->tx.flags |= HIF_USB_TX_FLUSH;
 633         spin_unlock_irqrestore(&hif_dev->tx.tx_lock, flags);
 634
 635         list_for_each_entry_safe(tx_buf, tx_buf_tmp,
 636                                  &hif_dev->tx.tx_pending, list) {
 637                 usb_kill_urb(tx_buf->urb);
 638                 list_del(&tx_buf->list);
 639                 usb_free_urb(tx_buf->urb);
 640                 kfree(tx_buf->buf);
 641                 kfree(tx_buf);
 642         }
 643 }
 644
 645 static int ath9k_hif_usb_alloc_tx_urbs(struct hif_device_usb *hif_dev)
 646 {
 647         struct tx_buf *tx_buf;
 648         int i;
 649
 650         INIT_LIST_HEAD(&hif_dev->tx.tx_buf);
 651         INIT_LIST_HEAD(&hif_dev->tx.tx_pending);
 652         spin_lock_init(&hif_dev->tx.tx_lock);
 653         __skb_queue_head_init(&hif_dev->tx.tx_skb_queue);
 654
 655         for (i = 0; i < MAX_TX_URB_NUM; i++) {
 656                 tx_buf = kzalloc(sizeof(struct tx_buf), GFP_KERNEL);
 657                 if (!tx_buf)
 658                         goto err;
 659
 660                 tx_buf->buf = kzalloc(MAX_TX_BUF_SIZE, GFP_KERNEL);
 661                 if (!tx_buf->buf)
 662                         goto err;
 663
 664                 tx_buf->urb = usb_alloc_urb(0, GFP_KERNEL);
 665                 if (!tx_buf->urb)
 666                         goto err;
 667
 668                 tx_buf->hif_dev = hif_dev;
 669                 __skb_queue_head_init(&tx_buf->skb_queue);
 670
 671                 list_add_tail(&tx_buf->list, &hif_dev->tx.tx_buf);
 672         }
 673
 674         hif_dev->tx.tx_buf_cnt = MAX_TX_URB_NUM;
 675
 676         return 0;
 677 err:
 678         if (tx_buf) {
 679                 kfree(tx_buf->buf);
 680                 kfree(tx_buf);
 681         }
 682         ath9k_hif_usb_dealloc_tx_urbs(hif_dev);
 683         return -ENOMEM;
 684 }
 685
 686 static void ath9k_hif_usb_dealloc_rx_urbs(struct hif_device_usb *hif_dev)
 687 {
 688         usb_kill_anchored_urbs(&hif_dev->rx_submitted);
 689 }
 690
 691 static int ath9k_hif_usb_alloc_rx_urbs(struct hif_device_usb *hif_dev)
 692 {
 693         struct urb *urb = NULL;
 694         struct sk_buff *skb = NULL;
 695         int i, ret;
 696
 697         init_usb_anchor(&hif_dev->rx_submitted);
 698         spin_lock_init(&hif_dev->rx_lock);
 699
 700         for (i = 0; i < MAX_RX_URB_NUM; i++) {
 701
 702                 /* Allocate URB */
 703                 urb = usb_alloc_urb(0, GFP_KERNEL);
 704                 if (urb == NULL) {
 705                         ret = -ENOMEM;
 706                         goto err_urb;
 707                 }
 708
 709                 /* Allocate buffer */
 710                 skb = alloc_skb(MAX_RX_BUF_SIZE, GFP_KERNEL);
 711                 if (!skb) {
 712                         ret = -ENOMEM;
 713                         goto err_skb;
 714                 }
 715
 716                 usb_fill_bulk_urb(urb, hif_dev->udev,
 717                                   usb_rcvbulkpipe(hif_dev->udev,
 718                                                   USB_WLAN_RX_PIPE),
 719                                   skb->data, MAX_RX_BUF_SIZE,
 720                                   ath9k_hif_usb_rx_cb, skb);
 721
 722                 /* Anchor URB */
 723                 usb_anchor_urb(urb, &hif_dev->rx_submitted);
 724
 725                 /* Submit URB */
 726                 ret = usb_submit_urb(urb, GFP_KERNEL);
 727                 if (ret) {
 728                         usb_unanchor_urb(urb);
 729                         goto err_submit;
 730                 }
 731
 732                 /*
 733                  * Drop reference count.
 734                  * This ensures that the URB is freed when killing them.
 735                  */
 736                 usb_free_urb(urb);
 737         }
 738
 739         return 0;
 740
 741 err_submit:
 742         kfree_skb(skb);
 743 err_skb:
 744         usb_free_urb(urb);
 745 err_urb:
 746         ath9k_hif_usb_dealloc_rx_urbs(hif_dev);
 747         return ret;
 748 }
 749
 750 static void ath9k_hif_usb_dealloc_reg_in_urb(struct hif_device_usb *hif_dev)
 751 {
 752         if (hif_dev->reg_in_urb) {
 753                 usb_kill_urb(hif_dev->reg_in_urb);
 754                 if (hif_dev->reg_in_urb->context)
 755                         kfree_skb((void *)hif_dev->reg_in_urb->context);
 756                 usb_free_urb(hif_dev->reg_in_urb);
 757                 hif_dev->reg_in_urb = NULL;
 758         }
 759 }
 760
 761 static int ath9k_hif_usb_alloc_reg_in_urb(struct hif_device_usb *hif_dev)
 762 {
 763         struct sk_buff *skb;
 764
 765         hif_dev->reg_in_urb = usb_alloc_urb(0, GFP_KERNEL);
 766         if (hif_dev->reg_in_urb == NULL)
 767                 return -ENOMEM;
 768
 769         skb = alloc_skb(MAX_REG_IN_BUF_SIZE, GFP_KERNEL);
 770         if (!skb)
 771                 goto err;
 772
 773         usb_fill_bulk_urb(hif_dev->reg_in_urb, hif_dev->udev,
 774                          usb_rcvbulkpipe(hif_dev->udev,
 775                                          USB_REG_IN_PIPE),
 776                          skb->data, MAX_REG_IN_BUF_SIZE,
 777                          ath9k_hif_usb_reg_in_cb, skb);
 778
 779         if (usb_submit_urb(hif_dev->reg_in_urb, GFP_KERNEL) != 0)
 780                 goto err;
 781
 782         return 0;
 783
 784 err:
 785         ath9k_hif_usb_dealloc_reg_in_urb(hif_dev);
 786         return -ENOMEM;
 787 }
 788
 789 static int ath9k_hif_usb_alloc_urbs(struct hif_device_usb *hif_dev)
 790 {
 791         /* Register Write */
 792         init_usb_anchor(&hif_dev->regout_submitted);
 793
 794         /* TX */
 795         if (ath9k_hif_usb_alloc_tx_urbs(hif_dev) < 0)
 796                 goto err;
 797
 798         /* RX */
 799         if (ath9k_hif_usb_alloc_rx_urbs(hif_dev) < 0)
 800                 goto err_rx;
 801
 802         /* Register Read */
 803         if (ath9k_hif_usb_alloc_reg_in_urb(hif_dev) < 0)
 804                 goto err_reg;
 805
 806         return 0;
 807 err_reg:
 808         ath9k_hif_usb_dealloc_rx_urbs(hif_dev);
 809 err_rx:
 810         ath9k_hif_usb_dealloc_tx_urbs(hif_dev);
 811 err:
 812         return -ENOMEM;
 813 }
 814
 815 static void ath9k_hif_usb_dealloc_urbs(struct hif_device_usb *hif_dev)
 816 {
 817         usb_kill_anchored_urbs(&hif_dev->regout_submitted);
 818         ath9k_hif_usb_dealloc_reg_in_urb(hif_dev);
 819         ath9k_hif_usb_dealloc_tx_urbs(hif_dev);
 820         ath9k_hif_usb_dealloc_rx_urbs(hif_dev);
 821 }
 822
 823 static int ath9k_hif_usb_download_fw(struct hif_device_usb *hif_dev,
 824                                      u32 drv_info)
 825 {
 826         int transfer, err;
 827         const void *data = hif_dev->firmware->data;
 828         size_t len = hif_dev->firmware->size;
 829         u32 addr = AR9271_FIRMWARE;
 830         u8 *buf = kzalloc(4096, GFP_KERNEL);
 831         u32 firm_offset;
 832
 833         if (!buf)
 834                 return -ENOMEM;
 835
 836         while (len) {
 837                 transfer = min_t(int, len, 4096);
 838                 memcpy(buf, data, transfer);
 839
 840                 err = usb_control_msg(hif_dev->udev,
 841                                       usb_sndctrlpipe(hif_dev->udev, 0),
 842                                       FIRMWARE_DOWNLOAD, 0x40 | USB_DIR_OUT,
 843                                       addr >> 8, 0, buf, transfer, HZ);
 844                 if (err < 0) {
 845                         kfree(buf);
 846                         return err;
 847                 }
 848
 849                 len -= transfer;
 850                 data += transfer;
 851                 addr += transfer;
 852         }
 853         kfree(buf);
 854
 855         if (IS_AR7010_DEVICE(drv_info))
 856                 firm_offset = AR7010_FIRMWARE_TEXT;
 857         else
 858                 firm_offset = AR9271_FIRMWARE_TEXT;
 859
 860         /*
 861          * Issue FW download complete command to firmware.
 862          */
 863         err = usb_control_msg(hif_dev->udev, usb_sndctrlpipe(hif_dev->udev, 0),
 864                               FIRMWARE_DOWNLOAD_COMP,
 865                               0x40 | USB_DIR_OUT,
 866                               firm_offset >> 8, 0, NULL, 0, HZ);
 867         if (err)
 868                 return -EIO;
 869
 870         dev_info(&hif_dev->udev->dev, "ath9k_htc: Transferred FW: %s, size: %ld\n",
 871                  hif_dev->fw_name, (unsigned long) hif_dev->firmware->size);
 872
 873         return 0;
 874 }
 875
 876 static int ath9k_hif_usb_dev_init(struct hif_device_usb *hif_dev, u32 drv_info)
 877 {
 878         int ret, idx;
 879         struct usb_host_interface *alt = &hif_dev->interface->altsetting[0];
 880         struct usb_endpoint_descriptor *endp;
 881
 882         /* Request firmware */
 883         ret = request_firmware(&hif_dev->firmware, hif_dev->fw_name,
 884                                &hif_dev->udev->dev);
 885         if (ret) {
 886                 dev_err(&hif_dev->udev->dev,
 887                         "ath9k_htc: Firmware - %s not found\n", hif_dev->fw_name);
 888                 goto err_fw_req;
 889         }
 890
 891         /* Download firmware */
 892         ret = ath9k_hif_usb_download_fw(hif_dev, drv_info);
 893         if (ret) {
 894                 dev_err(&hif_dev->udev->dev,
 895                         "ath9k_htc: Firmware - %s download failed\n",
 896                         hif_dev->fw_name);
 897                 goto err_fw_download;
 898         }
 899
 900         /* On downloading the firmware to the target, the USB descriptor of EP4
 901          * is 'patched' to change the type of the endpoint to Bulk. This will
 902          * bring down CPU usage during the scan period.
 903          */
 904         for (idx = 0; idx < alt->desc.bNumEndpoints; idx++) {
 905                 endp = &alt->endpoint[idx].desc;
 906                 if ((endp->bmAttributes & USB_ENDPOINT_XFERTYPE_MASK)
 907                                 == USB_ENDPOINT_XFER_INT) {
 908                         endp->bmAttributes &= ~USB_ENDPOINT_XFERTYPE_MASK;
 909                         endp->bmAttributes |= USB_ENDPOINT_XFER_BULK;
 910                         endp->bInterval = 0;
 911                 }
 912         }
 913
 914         /* Alloc URBs */
 915         ret = ath9k_hif_usb_alloc_urbs(hif_dev);
 916         if (ret) {
 917                 dev_err(&hif_dev->udev->dev,
 918                         "ath9k_htc: Unable to allocate URBs\n");
 919                 goto err_fw_download;
 920         }
 921
 922         return 0;
 923
 924 err_fw_download:
 925         release_firmware(hif_dev->firmware);
 926 err_fw_req:
 927         hif_dev->firmware = NULL;
 928         return ret;
 929 }
 930
 931 static void ath9k_hif_usb_dev_deinit(struct hif_device_usb *hif_dev)
 932 {
 933         ath9k_hif_usb_dealloc_urbs(hif_dev);
 934         if (hif_dev->firmware)
 935                 release_firmware(hif_dev->firmware);
 936 }
 937
 938 /*
 939  * An exact copy of the function from zd1211rw.
 940  */
 941 static int send_eject_command(struct usb_interface *interface)
 942 {
 943         struct usb_device *udev = interface_to_usbdev(interface);
 944         struct usb_host_interface *iface_desc = &interface->altsetting[0];
 945         struct usb_endpoint_descriptor *endpoint;
 946         unsigned char *cmd;
 947         u8 bulk_out_ep;
 948         int r;
 949
 950         /* Find bulk out endpoint */
 951         for (r = 1; r >= 0; r--) {
 952                 endpoint = &iface_desc->endpoint[r].desc;
 953                 if (usb_endpoint_dir_out(endpoint) &&
 954                     usb_endpoint_xfer_bulk(endpoint)) {
 955                         bulk_out_ep = endpoint->bEndpointAddress;
 956                         break;
 957                 }
 958         }
 959         if (r == -1) {
 960                 dev_err(&udev->dev,
 961                         "ath9k_htc: Could not find bulk out endpoint\n");
 962                 return -ENODEV;
 963         }
 964
 965         cmd = kzalloc(31, GFP_KERNEL);
 966         if (cmd == NULL)
 967                 return -ENODEV;
 968
 969         /* USB bulk command block */
 970         cmd[0] = 0x55;  /* bulk command signature */
 971         cmd[1] = 0x53;  /* bulk command signature */
 972         cmd[2] = 0x42;  /* bulk command signature */
 973         cmd[3] = 0x43;  /* bulk command signature */
 974         cmd[14] = 6;    /* command length */
 975
 976         cmd[15] = 0x1b; /* SCSI command: START STOP UNIT */
 977         cmd[19] = 0x2;  /* eject disc */
 978
 979         dev_info(&udev->dev, "Ejecting storage device...\n");
 980         r = usb_bulk_msg(udev, usb_sndbulkpipe(udev, bulk_out_ep),
 981                 cmd, 31, NULL, 2000);
 982         kfree(cmd);
 983         if (r)
 984                 return r;
 985
 986         /* At this point, the device disconnects and reconnects with the real
 987          * ID numbers. */
 988
 989         usb_set_intfdata(interface, NULL);
 990         return 0;
 991 }
 992
 993 static int ath9k_hif_usb_probe(struct usb_interface *interface,
 994                                const struct usb_device_id *id)
 995 {
 996         struct usb_device *udev = interface_to_usbdev(interface);
 997         struct hif_device_usb *hif_dev;
 998         int ret = 0;
 999
1000         if (id->driver_info == STORAGE_DEVICE)
1001                 return send_eject_command(interface);
1002
1003         hif_dev = kzalloc(sizeof(struct hif_device_usb), GFP_KERNEL);
1004         if (!hif_dev) {
1005                 ret = -ENOMEM;
1006                 goto err_alloc;
1007         }
1008
1009         usb_get_dev(udev);
1010         hif_dev->udev = udev;
1011         hif_dev->interface = interface;
1012         hif_dev->device_id = id->idProduct;
1013 #ifdef CONFIG_PM
1014         udev->reset_resume = 1;
1015 #endif
1016         usb_set_intfdata(interface, hif_dev);
1017
1018         hif_dev->htc_handle = ath9k_htc_hw_alloc(hif_dev, &hif_usb,
1019                                                  &hif_dev->udev->dev);
1020         if (hif_dev->htc_handle == NULL) {
1021                 ret = -ENOMEM;
1022                 goto err_htc_hw_alloc;
1023         }
1024
1025         /* Find out which firmware to load */
1026
1027         if (IS_AR7010_DEVICE(id->driver_info))
1028                 if (le16_to_cpu(udev->descriptor.bcdDevice) == 0x0202)
1029                         hif_dev->fw_name = FIRMWARE_AR7010_1_1;
1030                 else
1031                         hif_dev->fw_name = FIRMWARE_AR7010;
1032         else
1033                 hif_dev->fw_name = FIRMWARE_AR9271;
1034
1035         ret = ath9k_hif_usb_dev_init(hif_dev, id->driver_info);
1036         if (ret) {
1037                 ret = -EINVAL;
1038                 goto err_hif_init_usb;
1039         }
1040
1041         ret = ath9k_htc_hw_init(hif_dev->htc_handle,
1042                                 &hif_dev->udev->dev, hif_dev->device_id,
1043                                 hif_dev->udev->product, id->driver_info);
1044         if (ret) {
1045                 ret = -EINVAL;
1046                 goto err_htc_hw_init;
1047         }
1048
1049         dev_info(&hif_dev->udev->dev, "ath9k_htc: USB layer initialized\n");
1050
1051         return 0;
1052
1053 err_htc_hw_init:
1054         ath9k_hif_usb_dev_deinit(hif_dev);
1055 err_hif_init_usb:
1056         ath9k_htc_hw_free(hif_dev->htc_handle);
1057 err_htc_hw_alloc:
1058         usb_set_intfdata(interface, NULL);
1059         kfree(hif_dev);
1060         usb_put_dev(udev);
1061 err_alloc:
1062         return ret;
1063 }
1064
1065 static void ath9k_hif_usb_reboot(struct usb_device *udev)
1066 {
1067         u32 reboot_cmd = 0xffffffff;
1068         void *buf;
1069         int ret;
1070
1071         buf = kmemdup(&reboot_cmd, 4, GFP_KERNEL);
1072         if (!buf)
1073                 return;
1074
1075         ret = usb_bulk_msg(udev, usb_sndbulkpipe(udev, USB_REG_OUT_PIPE),
1076                            buf, 4, NULL, HZ);
1077         if (ret)
1078                 dev_err(&udev->dev, "ath9k_htc: USB reboot failed\n");
1079
1080         kfree(buf);
1081 }
1082
1083 static void ath9k_hif_usb_disconnect(struct usb_interface *interface)
1084 {
1085         struct usb_device *udev = interface_to_usbdev(interface);
1086         struct hif_device_usb *hif_dev = usb_get_intfdata(interface);
1087         bool unplugged = (udev->state == USB_STATE_NOTATTACHED) ? true : false;
1088
1089         if (!hif_dev)
1090                 return;
1091
1092         ath9k_htc_hw_deinit(hif_dev->htc_handle, unplugged);
1093         ath9k_htc_hw_free(hif_dev->htc_handle);
1094         ath9k_hif_usb_dev_deinit(hif_dev);
1095         usb_set_intfdata(interface, NULL);
1096
1097         if (!unplugged && (hif_dev->flags & HIF_USB_START))
1098                 ath9k_hif_usb_reboot(udev);
1099
1100         kfree(hif_dev);
1101         dev_info(&udev->dev, "ath9k_htc: USB layer deinitialized\n");
1102         usb_put_dev(udev);
1103 }
1104
1105 #ifdef CONFIG_PM
1106 static int ath9k_hif_usb_suspend(struct usb_interface *interface,
1107                                  pm_message_t message)
1108 {
1109         struct hif_device_usb *hif_dev = usb_get_intfdata(interface);
1110
1111         /*
1112          * The device has to be set to FULLSLEEP mode in case no
1113          * interface is up.
1114          */
1115         if (!(hif_dev->flags & HIF_USB_START))
1116                 ath9k_htc_suspend(hif_dev->htc_handle);
1117
1118         ath9k_hif_usb_dealloc_urbs(hif_dev);
1119
1120         return 0;
1121 }
1122
1123 static int ath9k_hif_usb_resume(struct usb_interface *interface)
1124 {
1125         struct hif_device_usb *hif_dev = usb_get_intfdata(interface);
1126         struct htc_target *htc_handle = hif_dev->htc_handle;
1127         int ret;
1128
1129         ret = ath9k_hif_usb_alloc_urbs(hif_dev);
1130         if (ret)
1131                 return ret;
1132
1133         if (hif_dev->firmware) {
1134                 ret = ath9k_hif_usb_download_fw(hif_dev,
1135                                 htc_handle->drv_priv->ah->hw_version.usbdev);
1136                 if (ret)
1137                         goto fail_resume;
1138         } else {
1139                 ath9k_hif_usb_dealloc_urbs(hif_dev);
1140                 return -EIO;
1141         }
1142
1143         mdelay(100);
1144
1145         ret = ath9k_htc_resume(htc_handle);
1146
1147         if (ret)
1148                 goto fail_resume;
1149
1150         return 0;
1151
1152 fail_resume:
1153         ath9k_hif_usb_dealloc_urbs(hif_dev);
1154
1155         return ret;
1156 }
1157 #endif
1158
1159 static struct usb_driver ath9k_hif_usb_driver = {
1160         .name = "ath9k_hif_usb",
1161         .probe = ath9k_hif_usb_probe,
1162         .disconnect = ath9k_hif_usb_disconnect,
1163 #ifdef CONFIG_PM
1164         .suspend = ath9k_hif_usb_suspend,
1165         .resume = ath9k_hif_usb_resume,
1166         .reset_resume = ath9k_hif_usb_resume,
1167 #endif
1168         .id_table = ath9k_hif_usb_ids,
1169         .soft_unbind = 1,
1170 };
1171
1172 int ath9k_hif_usb_init(void)
1173 {
1174         return usb_register(&ath9k_hif_usb_driver);
1175 }
1176
1177 void ath9k_hif_usb_exit(void)
1178 {
1179         usb_deregister(&ath9k_hif_usb_driver);
1180 }