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 tx_skb_cnt = 0;
 226         u8 *buf;
 227         __le16 *hdr;
 228
 229         if (hif_dev->tx.tx_skb_cnt == 0)
 230                 return 0;
 231
 232         /* Check if a free TX buffer is available */
 233         if (list_empty(&hif_dev->tx.tx_buf))
 234                 return 0;
 235
 236         tx_buf = list_first_entry(&hif_dev->tx.tx_buf, struct tx_buf, list);
 237         list_move_tail(&tx_buf->list, &hif_dev->tx.tx_pending);
 238         hif_dev->tx.tx_buf_cnt--;
 239
 240         tx_skb_cnt = min_t(u16, hif_dev->tx.tx_skb_cnt, MAX_TX_AGGR_NUM);
 241
 242         for (i = 0; i < tx_skb_cnt; i++) {
 243                 nskb = __skb_dequeue(&hif_dev->tx.tx_skb_queue);
 244
 245                 /* Should never be NULL */
 246                 BUG_ON(!nskb);
 247
 248                 hif_dev->tx.tx_skb_cnt--;
 249
 250                 buf = tx_buf->buf;
 251                 buf += tx_buf->offset;
 252                 hdr = (__le16 *)buf;
 253                 *hdr++ = cpu_to_le16(nskb->len);
 254                 *hdr++ = cpu_to_le16(ATH_USB_TX_STREAM_MODE_TAG);
 255                 buf += 4;
 256                 memcpy(buf, nskb->data, nskb->len);
 257                 tx_buf->len = nskb->len + 4;
 258
 259                 if (i < (tx_skb_cnt - 1))
 260                         tx_buf->offset += (((tx_buf->len - 1) / 4) + 1) * 4;
 261
 262                 if (i == (tx_skb_cnt - 1))
 263                         tx_buf->len += tx_buf->offset;
 264
 265                 __skb_queue_tail(&tx_buf->skb_queue, nskb);
 266                 TX_STAT_INC(skb_queued);
 267         }
 268
 269         usb_fill_bulk_urb(tx_buf->urb, hif_dev->udev,
 270                           usb_sndbulkpipe(hif_dev->udev, USB_WLAN_TX_PIPE),
 271                           tx_buf->buf, tx_buf->len,
 272                           hif_usb_tx_cb, tx_buf);
 273
 274         ret = usb_submit_urb(tx_buf->urb, GFP_ATOMIC);
 275         if (ret) {
 276                 tx_buf->len = tx_buf->offset = 0;
 277                 ath9k_skb_queue_purge(hif_dev, &tx_buf->skb_queue);
 278                 __skb_queue_head_init(&tx_buf->skb_queue);
 279                 list_move_tail(&tx_buf->list, &hif_dev->tx.tx_buf);
 280                 hif_dev->tx.tx_buf_cnt++;
 281         }
 282
 283         if (!ret)
 284                 TX_STAT_INC(buf_queued);
 285
 286         return ret;
 287 }
 288
 289 static int hif_usb_send_tx(struct hif_device_usb *hif_dev, struct sk_buff *skb,
 290                            struct ath9k_htc_tx_ctl *tx_ctl)
 291 {
 292         unsigned long flags;
 293
 294         spin_lock_irqsave(&hif_dev->tx.tx_lock, flags);
 295
 296         if (hif_dev->tx.flags & HIF_USB_TX_STOP) {
 297                 spin_unlock_irqrestore(&hif_dev->tx.tx_lock, flags);
 298                 return -ENODEV;
 299         }
 300
 301         /* Check if the max queue count has been reached */
 302         if (hif_dev->tx.tx_skb_cnt > MAX_TX_BUF_NUM) {
 303                 spin_unlock_irqrestore(&hif_dev->tx.tx_lock, flags);
 304                 return -ENOMEM;
 305         }
 306
 307         __skb_queue_tail(&hif_dev->tx.tx_skb_queue, skb);
 308         hif_dev->tx.tx_skb_cnt++;
 309
 310         /* Send normal frames immediately */
 311         if (!tx_ctl || (tx_ctl && (tx_ctl->type == ATH9K_HTC_NORMAL)))
 312                 __hif_usb_tx(hif_dev);
 313
 314         /* Check if AMPDUs have to be sent immediately */
 315         if (tx_ctl && (tx_ctl->type == ATH9K_HTC_AMPDU) &&
 316             (hif_dev->tx.tx_buf_cnt == MAX_TX_URB_NUM) &&
 317             (hif_dev->tx.tx_skb_cnt < 2)) {
 318                 __hif_usb_tx(hif_dev);
 319         }
 320
 321         spin_unlock_irqrestore(&hif_dev->tx.tx_lock, flags);
 322
 323         return 0;
 324 }
 325
 326 static void hif_usb_start(void *hif_handle, u8 pipe_id)
 327 {
 328         struct hif_device_usb *hif_dev = (struct hif_device_usb *)hif_handle;
 329         unsigned long flags;
 330
 331         hif_dev->flags |= HIF_USB_START;
 332
 333         spin_lock_irqsave(&hif_dev->tx.tx_lock, flags);
 334         hif_dev->tx.flags &= ~HIF_USB_TX_STOP;
 335         spin_unlock_irqrestore(&hif_dev->tx.tx_lock, flags);
 336 }
 337
 338 static void hif_usb_stop(void *hif_handle, u8 pipe_id)
 339 {
 340         struct hif_device_usb *hif_dev = (struct hif_device_usb *)hif_handle;
 341         struct tx_buf *tx_buf = NULL, *tx_buf_tmp = NULL;
 342         unsigned long flags;
 343
 344         spin_lock_irqsave(&hif_dev->tx.tx_lock, flags);
 345         ath9k_skb_queue_purge(hif_dev, &hif_dev->tx.tx_skb_queue);
 346         hif_dev->tx.tx_skb_cnt = 0;
 347         hif_dev->tx.flags |= HIF_USB_TX_STOP;
 348         spin_unlock_irqrestore(&hif_dev->tx.tx_lock, flags);
 349
 350         /* The pending URBs have to be canceled. */
 351         list_for_each_entry_safe(tx_buf, tx_buf_tmp,
 352                                  &hif_dev->tx.tx_pending, list) {
 353                 usb_kill_urb(tx_buf->urb);
 354         }
 355 }
 356
 357 static int hif_usb_send(void *hif_handle, u8 pipe_id, struct sk_buff *skb,
 358                         struct ath9k_htc_tx_ctl *tx_ctl)
 359 {
 360         struct hif_device_usb *hif_dev = (struct hif_device_usb *)hif_handle;
 361         int ret = 0;
 362
 363         switch (pipe_id) {
 364         case USB_WLAN_TX_PIPE:
 365                 ret = hif_usb_send_tx(hif_dev, skb, tx_ctl);
 366                 break;
 367         case USB_REG_OUT_PIPE:
 368                 ret = hif_usb_send_regout(hif_dev, skb);
 369                 break;
 370         default:
 371                 dev_err(&hif_dev->udev->dev,
 372                         "ath9k_htc: Invalid TX pipe: %d\n", pipe_id);
 373                 ret = -EINVAL;
 374                 break;
 375         }
 376
 377         return ret;
 378 }
 379
 380 static struct ath9k_htc_hif hif_usb = {
 381         .transport = ATH9K_HIF_USB,
 382         .name = "ath9k_hif_usb",
 383
 384         .control_ul_pipe = USB_REG_OUT_PIPE,
 385         .control_dl_pipe = USB_REG_IN_PIPE,
 386
 387         .start = hif_usb_start,
 388         .stop = hif_usb_stop,
 389         .send = hif_usb_send,
 390 };
 391
 392 static void ath9k_hif_usb_rx_stream(struct hif_device_usb *hif_dev,
 393                                     struct sk_buff *skb)
 394 {
 395         struct sk_buff *nskb, *skb_pool[MAX_PKT_NUM_IN_TRANSFER];
 396         int index = 0, i = 0, len = skb->len;
 397         int rx_remain_len, rx_pkt_len;
 398         u16 pool_index = 0;
 399         u8 *ptr;
 400
 401         spin_lock(&hif_dev->rx_lock);
 402
 403         rx_remain_len = hif_dev->rx_remain_len;
 404         rx_pkt_len = hif_dev->rx_transfer_len;
 405
 406         if (rx_remain_len != 0) {
 407                 struct sk_buff *remain_skb = hif_dev->remain_skb;
 408
 409                 if (remain_skb) {
 410                         ptr = (u8 *) remain_skb->data;
 411
 412                         index = rx_remain_len;
 413                         rx_remain_len -= hif_dev->rx_pad_len;
 414                         ptr += rx_pkt_len;
 415
 416                         memcpy(ptr, skb->data, rx_remain_len);
 417
 418                         rx_pkt_len += rx_remain_len;
 419                         hif_dev->rx_remain_len = 0;
 420                         skb_put(remain_skb, rx_pkt_len);
 421
 422                         skb_pool[pool_index++] = remain_skb;
 423
 424                 } else {
 425                         index = rx_remain_len;
 426                 }
 427         }
 428
 429         spin_unlock(&hif_dev->rx_lock);
 430
 431         while (index < len) {
 432                 u16 pkt_len;
 433                 u16 pkt_tag;
 434                 u16 pad_len;
 435                 int chk_idx;
 436
 437                 ptr = (u8 *) skb->data;
 438
 439                 pkt_len = ptr[index] + (ptr[index+1] << 8);
 440                 pkt_tag = ptr[index+2] + (ptr[index+3] << 8);
 441
 442                 if (pkt_tag != ATH_USB_RX_STREAM_MODE_TAG) {
 443                         RX_STAT_INC(skb_dropped);
 444                         return;
 445                 }
 446
 447                 pad_len = 4 - (pkt_len & 0x3);
 448                 if (pad_len == 4)
 449                         pad_len = 0;
 450
 451                 chk_idx = index;
 452                 index = index + 4 + pkt_len + pad_len;
 453
 454                 if (index > MAX_RX_BUF_SIZE) {
 455                         spin_lock(&hif_dev->rx_lock);
 456                         hif_dev->rx_remain_len = index - MAX_RX_BUF_SIZE;
 457                         hif_dev->rx_transfer_len =
 458                                 MAX_RX_BUF_SIZE - chk_idx - 4;
 459                         hif_dev->rx_pad_len = pad_len;
 460
 461                         nskb = __dev_alloc_skb(pkt_len + 32, GFP_ATOMIC);
 462                         if (!nskb) {
 463                                 dev_err(&hif_dev->udev->dev,
 464                                         "ath9k_htc: RX memory allocation error\n");
 465                                 spin_unlock(&hif_dev->rx_lock);
 466                                 goto err;
 467                         }
 468                         skb_reserve(nskb, 32);
 469                         RX_STAT_INC(skb_allocated);
 470
 471                         memcpy(nskb->data, &(skb->data[chk_idx+4]),
 472                                hif_dev->rx_transfer_len);
 473
 474                         /* Record the buffer pointer */
 475                         hif_dev->remain_skb = nskb;
 476                         spin_unlock(&hif_dev->rx_lock);
 477                 } else {
 478                         nskb = __dev_alloc_skb(pkt_len + 32, GFP_ATOMIC);
 479                         if (!nskb) {
 480                                 dev_err(&hif_dev->udev->dev,
 481                                         "ath9k_htc: RX memory allocation error\n");
 482                                 goto err;
 483                         }
 484                         skb_reserve(nskb, 32);
 485                         RX_STAT_INC(skb_allocated);
 486
 487                         memcpy(nskb->data, &(skb->data[chk_idx+4]), pkt_len);
 488                         skb_put(nskb, pkt_len);
 489                         skb_pool[pool_index++] = nskb;
 490                 }
 491         }
 492
 493 err:
 494         for (i = 0; i < pool_index; i++) {
 495                 ath9k_htc_rx_msg(hif_dev->htc_handle, skb_pool[i],
 496                                  skb_pool[i]->len, USB_WLAN_RX_PIPE);
 497                 RX_STAT_INC(skb_completed);
 498         }
 499 }
 500
 501 static void ath9k_hif_usb_rx_cb(struct urb *urb)
 502 {
 503         struct sk_buff *skb = (struct sk_buff *) urb->context;
 504         struct hif_device_usb *hif_dev =
 505                 usb_get_intfdata(usb_ifnum_to_if(urb->dev, 0));
 506         int ret;
 507
 508         if (!skb)
 509                 return;
 510
 511         if (!hif_dev)
 512                 goto free;
 513
 514         switch (urb->status) {
 515         case 0:
 516                 break;
 517         case -ENOENT:
 518         case -ECONNRESET:
 519         case -ENODEV:
 520         case -ESHUTDOWN:
 521                 goto free;
 522         default:
 523                 goto resubmit;
 524         }
 525
 526         if (likely(urb->actual_length != 0)) {
 527                 skb_put(skb, urb->actual_length);
 528                 ath9k_hif_usb_rx_stream(hif_dev, skb);
 529         }
 530
 531 resubmit:
 532         skb_reset_tail_pointer(skb);
 533         skb_trim(skb, 0);
 534
 535         usb_anchor_urb(urb, &hif_dev->rx_submitted);
 536         ret = usb_submit_urb(urb, GFP_ATOMIC);
 537         if (ret) {
 538                 usb_unanchor_urb(urb);
 539                 goto free;
 540         }
 541
 542         return;
 543 free:
 544         kfree_skb(skb);
 545 }
 546
 547 static void ath9k_hif_usb_reg_in_cb(struct urb *urb)
 548 {
 549         struct sk_buff *skb = (struct sk_buff *) urb->context;
 550         struct sk_buff *nskb;
 551         struct hif_device_usb *hif_dev =
 552                 usb_get_intfdata(usb_ifnum_to_if(urb->dev, 0));
 553         int ret;
 554
 555         if (!skb)
 556                 return;
 557
 558         if (!hif_dev)
 559                 goto free;
 560
 561         switch (urb->status) {
 562         case 0:
 563                 break;
 564         case -ENOENT:
 565         case -ECONNRESET:
 566         case -ENODEV:
 567         case -ESHUTDOWN:
 568                 goto free;
 569         default:
 570                 goto resubmit;
 571         }
 572
 573         if (likely(urb->actual_length != 0)) {
 574                 skb_put(skb, urb->actual_length);
 575
 576                 /* Process the command first */
 577                 ath9k_htc_rx_msg(hif_dev->htc_handle, skb,
 578                                  skb->len, USB_REG_IN_PIPE);
 579
 580
 581                 nskb = alloc_skb(MAX_REG_IN_BUF_SIZE, GFP_ATOMIC);
 582                 if (!nskb) {
 583                         dev_err(&hif_dev->udev->dev,
 584                                 "ath9k_htc: REG_IN memory allocation failure\n");
 585                         urb->context = NULL;
 586                         return;
 587                 }
 588
 589                 usb_fill_bulk_urb(urb, hif_dev->udev,
 590                                  usb_rcvbulkpipe(hif_dev->udev,
 591                                                  USB_REG_IN_PIPE),
 592                                  nskb->data, MAX_REG_IN_BUF_SIZE,
 593                                  ath9k_hif_usb_reg_in_cb, nskb);
 594
 595                 ret = usb_submit_urb(urb, GFP_ATOMIC);
 596                 if (ret) {
 597                         kfree_skb(nskb);
 598                         urb->context = NULL;
 599                 }
 600
 601                 return;
 602         }
 603
 604 resubmit:
 605         skb_reset_tail_pointer(skb);
 606         skb_trim(skb, 0);
 607
 608         ret = usb_submit_urb(urb, GFP_ATOMIC);
 609         if (ret)
 610                 goto free;
 611
 612         return;
 613 free:
 614         kfree_skb(skb);
 615         urb->context = NULL;
 616 }
 617
 618 static void ath9k_hif_usb_dealloc_tx_urbs(struct hif_device_usb *hif_dev)
 619 {
 620         struct tx_buf *tx_buf = NULL, *tx_buf_tmp = NULL;
 621         unsigned long flags;
 622
 623         list_for_each_entry_safe(tx_buf, tx_buf_tmp,
 624                                  &hif_dev->tx.tx_buf, list) {
 625                 usb_kill_urb(tx_buf->urb);
 626                 list_del(&tx_buf->list);
 627                 usb_free_urb(tx_buf->urb);
 628                 kfree(tx_buf->buf);
 629                 kfree(tx_buf);
 630         }
 631
 632         spin_lock_irqsave(&hif_dev->tx.tx_lock, flags);
 633         hif_dev->tx.flags |= HIF_USB_TX_FLUSH;
 634         spin_unlock_irqrestore(&hif_dev->tx.tx_lock, flags);
 635
 636         list_for_each_entry_safe(tx_buf, tx_buf_tmp,
 637                                  &hif_dev->tx.tx_pending, list) {
 638                 usb_kill_urb(tx_buf->urb);
 639                 list_del(&tx_buf->list);
 640                 usb_free_urb(tx_buf->urb);
 641                 kfree(tx_buf->buf);
 642                 kfree(tx_buf);
 643         }
 644 }
 645
 646 static int ath9k_hif_usb_alloc_tx_urbs(struct hif_device_usb *hif_dev)
 647 {
 648         struct tx_buf *tx_buf;
 649         int i;
 650
 651         INIT_LIST_HEAD(&hif_dev->tx.tx_buf);
 652         INIT_LIST_HEAD(&hif_dev->tx.tx_pending);
 653         spin_lock_init(&hif_dev->tx.tx_lock);
 654         __skb_queue_head_init(&hif_dev->tx.tx_skb_queue);
 655
 656         for (i = 0; i < MAX_TX_URB_NUM; i++) {
 657                 tx_buf = kzalloc(sizeof(struct tx_buf), GFP_KERNEL);
 658                 if (!tx_buf)
 659                         goto err;
 660
 661                 tx_buf->buf = kzalloc(MAX_TX_BUF_SIZE, GFP_KERNEL);
 662                 if (!tx_buf->buf)
 663                         goto err;
 664
 665                 tx_buf->urb = usb_alloc_urb(0, GFP_KERNEL);
 666                 if (!tx_buf->urb)
 667                         goto err;
 668
 669                 tx_buf->hif_dev = hif_dev;
 670                 __skb_queue_head_init(&tx_buf->skb_queue);
 671
 672                 list_add_tail(&tx_buf->list, &hif_dev->tx.tx_buf);
 673         }
 674
 675         hif_dev->tx.tx_buf_cnt = MAX_TX_URB_NUM;
 676
 677         return 0;
 678 err:
 679         if (tx_buf) {
 680                 kfree(tx_buf->buf);
 681                 kfree(tx_buf);
 682         }
 683         ath9k_hif_usb_dealloc_tx_urbs(hif_dev);
 684         return -ENOMEM;
 685 }
 686
 687 static void ath9k_hif_usb_dealloc_rx_urbs(struct hif_device_usb *hif_dev)
 688 {
 689         usb_kill_anchored_urbs(&hif_dev->rx_submitted);
 690 }
 691
 692 static int ath9k_hif_usb_alloc_rx_urbs(struct hif_device_usb *hif_dev)
 693 {
 694         struct urb *urb = NULL;
 695         struct sk_buff *skb = NULL;
 696         int i, ret;
 697
 698         init_usb_anchor(&hif_dev->rx_submitted);
 699         spin_lock_init(&hif_dev->rx_lock);
 700
 701         for (i = 0; i < MAX_RX_URB_NUM; i++) {
 702
 703                 /* Allocate URB */
 704                 urb = usb_alloc_urb(0, GFP_KERNEL);
 705                 if (urb == NULL) {
 706                         ret = -ENOMEM;
 707                         goto err_urb;
 708                 }
 709
 710                 /* Allocate buffer */
 711                 skb = alloc_skb(MAX_RX_BUF_SIZE, GFP_KERNEL);
 712                 if (!skb) {
 713                         ret = -ENOMEM;
 714                         goto err_skb;
 715                 }
 716
 717                 usb_fill_bulk_urb(urb, hif_dev->udev,
 718                                   usb_rcvbulkpipe(hif_dev->udev,
 719                                                   USB_WLAN_RX_PIPE),
 720                                   skb->data, MAX_RX_BUF_SIZE,
 721                                   ath9k_hif_usb_rx_cb, skb);
 722
 723                 /* Anchor URB */
 724                 usb_anchor_urb(urb, &hif_dev->rx_submitted);
 725
 726                 /* Submit URB */
 727                 ret = usb_submit_urb(urb, GFP_KERNEL);
 728                 if (ret) {
 729                         usb_unanchor_urb(urb);
 730                         goto err_submit;
 731                 }
 732
 733                 /*
 734                  * Drop reference count.
 735                  * This ensures that the URB is freed when killing them.
 736                  */
 737                 usb_free_urb(urb);
 738         }
 739
 740         return 0;
 741
 742 err_submit:
 743         kfree_skb(skb);
 744 err_skb:
 745         usb_free_urb(urb);
 746 err_urb:
 747         ath9k_hif_usb_dealloc_rx_urbs(hif_dev);
 748         return ret;
 749 }
 750
 751 static void ath9k_hif_usb_dealloc_reg_in_urb(struct hif_device_usb *hif_dev)
 752 {
 753         if (hif_dev->reg_in_urb) {
 754                 usb_kill_urb(hif_dev->reg_in_urb);
 755                 if (hif_dev->reg_in_urb->context)
 756                         kfree_skb((void *)hif_dev->reg_in_urb->context);
 757                 usb_free_urb(hif_dev->reg_in_urb);
 758                 hif_dev->reg_in_urb = NULL;
 759         }
 760 }
 761
 762 static int ath9k_hif_usb_alloc_reg_in_urb(struct hif_device_usb *hif_dev)
 763 {
 764         struct sk_buff *skb;
 765
 766         hif_dev->reg_in_urb = usb_alloc_urb(0, GFP_KERNEL);
 767         if (hif_dev->reg_in_urb == NULL)
 768                 return -ENOMEM;
 769
 770         skb = alloc_skb(MAX_REG_IN_BUF_SIZE, GFP_KERNEL);
 771         if (!skb)
 772                 goto err;
 773
 774         usb_fill_bulk_urb(hif_dev->reg_in_urb, hif_dev->udev,
 775                          usb_rcvbulkpipe(hif_dev->udev,
 776                                          USB_REG_IN_PIPE),
 777                          skb->data, MAX_REG_IN_BUF_SIZE,
 778                          ath9k_hif_usb_reg_in_cb, skb);
 779
 780         if (usb_submit_urb(hif_dev->reg_in_urb, GFP_KERNEL) != 0)
 781                 goto err;
 782
 783         return 0;
 784
 785 err:
 786         ath9k_hif_usb_dealloc_reg_in_urb(hif_dev);
 787         return -ENOMEM;
 788 }
 789
 790 static int ath9k_hif_usb_alloc_urbs(struct hif_device_usb *hif_dev)
 791 {
 792         /* Register Write */
 793         init_usb_anchor(&hif_dev->regout_submitted);
 794
 795         /* TX */
 796         if (ath9k_hif_usb_alloc_tx_urbs(hif_dev) < 0)
 797                 goto err;
 798
 799         /* RX */
 800         if (ath9k_hif_usb_alloc_rx_urbs(hif_dev) < 0)
 801                 goto err_rx;
 802
 803         /* Register Read */
 804         if (ath9k_hif_usb_alloc_reg_in_urb(hif_dev) < 0)
 805                 goto err_reg;
 806
 807         return 0;
 808 err_reg:
 809         ath9k_hif_usb_dealloc_rx_urbs(hif_dev);
 810 err_rx:
 811         ath9k_hif_usb_dealloc_tx_urbs(hif_dev);
 812 err:
 813         return -ENOMEM;
 814 }
 815
 816 static void ath9k_hif_usb_dealloc_urbs(struct hif_device_usb *hif_dev)
 817 {
 818         usb_kill_anchored_urbs(&hif_dev->regout_submitted);
 819         ath9k_hif_usb_dealloc_reg_in_urb(hif_dev);
 820         ath9k_hif_usb_dealloc_tx_urbs(hif_dev);
 821         ath9k_hif_usb_dealloc_rx_urbs(hif_dev);
 822 }
 823
 824 static int ath9k_hif_usb_download_fw(struct hif_device_usb *hif_dev,
 825                                      u32 drv_info)
 826 {
 827         int transfer, err;
 828         const void *data = hif_dev->firmware->data;
 829         size_t len = hif_dev->firmware->size;
 830         u32 addr = AR9271_FIRMWARE;
 831         u8 *buf = kzalloc(4096, GFP_KERNEL);
 832         u32 firm_offset;
 833
 834         if (!buf)
 835                 return -ENOMEM;
 836
 837         while (len) {
 838                 transfer = min_t(int, len, 4096);
 839                 memcpy(buf, data, transfer);
 840
 841                 err = usb_control_msg(hif_dev->udev,
 842                                       usb_sndctrlpipe(hif_dev->udev, 0),
 843                                       FIRMWARE_DOWNLOAD, 0x40 | USB_DIR_OUT,
 844                                       addr >> 8, 0, buf, transfer, HZ);
 845                 if (err < 0) {
 846                         kfree(buf);
 847                         return err;
 848                 }
 849
 850                 len -= transfer;
 851                 data += transfer;
 852                 addr += transfer;
 853         }
 854         kfree(buf);
 855
 856         if (IS_AR7010_DEVICE(drv_info))
 857                 firm_offset = AR7010_FIRMWARE_TEXT;
 858         else
 859                 firm_offset = AR9271_FIRMWARE_TEXT;
 860
 861         /*
 862          * Issue FW download complete command to firmware.
 863          */
 864         err = usb_control_msg(hif_dev->udev, usb_sndctrlpipe(hif_dev->udev, 0),
 865                               FIRMWARE_DOWNLOAD_COMP,
 866                               0x40 | USB_DIR_OUT,
 867                               firm_offset >> 8, 0, NULL, 0, HZ);
 868         if (err)
 869                 return -EIO;
 870
 871         dev_info(&hif_dev->udev->dev, "ath9k_htc: Transferred FW: %s, size: %ld\n",
 872                  hif_dev->fw_name, (unsigned long) hif_dev->firmware->size);
 873
 874         return 0;
 875 }
 876
 877 static int ath9k_hif_usb_dev_init(struct hif_device_usb *hif_dev, u32 drv_info)
 878 {
 879         int ret, idx;
 880         struct usb_host_interface *alt = &hif_dev->interface->altsetting[0];
 881         struct usb_endpoint_descriptor *endp;
 882
 883         /* Request firmware */
 884         ret = request_firmware(&hif_dev->firmware, hif_dev->fw_name,
 885                                &hif_dev->udev->dev);
 886         if (ret) {
 887                 dev_err(&hif_dev->udev->dev,
 888                         "ath9k_htc: Firmware - %s not found\n", hif_dev->fw_name);
 889                 goto err_fw_req;
 890         }
 891
 892         /* Download firmware */
 893         ret = ath9k_hif_usb_download_fw(hif_dev, drv_info);
 894         if (ret) {
 895                 dev_err(&hif_dev->udev->dev,
 896                         "ath9k_htc: Firmware - %s download failed\n",
 897                         hif_dev->fw_name);
 898                 goto err_fw_download;
 899         }
 900
 901         /* On downloading the firmware to the target, the USB descriptor of EP4
 902          * is 'patched' to change the type of the endpoint to Bulk. This will
 903          * bring down CPU usage during the scan period.
 904          */
 905         for (idx = 0; idx < alt->desc.bNumEndpoints; idx++) {
 906                 endp = &alt->endpoint[idx].desc;
 907                 if ((endp->bmAttributes & USB_ENDPOINT_XFERTYPE_MASK)
 908                                 == USB_ENDPOINT_XFER_INT) {
 909                         endp->bmAttributes &= ~USB_ENDPOINT_XFERTYPE_MASK;
 910                         endp->bmAttributes |= USB_ENDPOINT_XFER_BULK;
 911                         endp->bInterval = 0;
 912                 }
 913         }
 914
 915         /* Alloc URBs */
 916         ret = ath9k_hif_usb_alloc_urbs(hif_dev);
 917         if (ret) {
 918                 dev_err(&hif_dev->udev->dev,
 919                         "ath9k_htc: Unable to allocate URBs\n");
 920                 goto err_fw_download;
 921         }
 922
 923         return 0;
 924
 925 err_fw_download:
 926         release_firmware(hif_dev->firmware);
 927 err_fw_req:
 928         hif_dev->firmware = NULL;
 929         return ret;
 930 }
 931
 932 static void ath9k_hif_usb_dev_deinit(struct hif_device_usb *hif_dev)
 933 {
 934         ath9k_hif_usb_dealloc_urbs(hif_dev);
 935         if (hif_dev->firmware)
 936                 release_firmware(hif_dev->firmware);
 937 }
 938
 939 /*
 940  * An exact copy of the function from zd1211rw.
 941  */
 942 static int send_eject_command(struct usb_interface *interface)
 943 {
 944         struct usb_device *udev = interface_to_usbdev(interface);
 945         struct usb_host_interface *iface_desc = &interface->altsetting[0];
 946         struct usb_endpoint_descriptor *endpoint;
 947         unsigned char *cmd;
 948         u8 bulk_out_ep;
 949         int r;
 950
 951         /* Find bulk out endpoint */
 952         for (r = 1; r >= 0; r--) {
 953                 endpoint = &iface_desc->endpoint[r].desc;
 954                 if (usb_endpoint_dir_out(endpoint) &&
 955                     usb_endpoint_xfer_bulk(endpoint)) {
 956                         bulk_out_ep = endpoint->bEndpointAddress;
 957                         break;
 958                 }
 959         }
 960         if (r == -1) {
 961                 dev_err(&udev->dev,
 962                         "ath9k_htc: Could not find bulk out endpoint\n");
 963                 return -ENODEV;
 964         }
 965
 966         cmd = kzalloc(31, GFP_KERNEL);
 967         if (cmd == NULL)
 968                 return -ENODEV;
 969
 970         /* USB bulk command block */
 971         cmd[0] = 0x55;  /* bulk command signature */
 972         cmd[1] = 0x53;  /* bulk command signature */
 973         cmd[2] = 0x42;  /* bulk command signature */
 974         cmd[3] = 0x43;  /* bulk command signature */
 975         cmd[14] = 6;    /* command length */
 976
 977         cmd[15] = 0x1b; /* SCSI command: START STOP UNIT */
 978         cmd[19] = 0x2;  /* eject disc */
 979
 980         dev_info(&udev->dev, "Ejecting storage device...\n");
 981         r = usb_bulk_msg(udev, usb_sndbulkpipe(udev, bulk_out_ep),
 982                 cmd, 31, NULL, 2000);
 983         kfree(cmd);
 984         if (r)
 985                 return r;
 986
 987         /* At this point, the device disconnects and reconnects with the real
 988          * ID numbers. */
 989
 990         usb_set_intfdata(interface, NULL);
 991         return 0;
 992 }
 993
 994 static int ath9k_hif_usb_probe(struct usb_interface *interface,
 995                                const struct usb_device_id *id)
 996 {
 997         struct usb_device *udev = interface_to_usbdev(interface);
 998         struct hif_device_usb *hif_dev;
 999         int ret = 0;
1000
1001         if (id->driver_info == STORAGE_DEVICE)
1002                 return send_eject_command(interface);
1003
1004         hif_dev = kzalloc(sizeof(struct hif_device_usb), GFP_KERNEL);
1005         if (!hif_dev) {
1006                 ret = -ENOMEM;
1007                 goto err_alloc;
1008         }
1009
1010         usb_get_dev(udev);
1011         hif_dev->udev = udev;
1012         hif_dev->interface = interface;
1013         hif_dev->device_id = id->idProduct;
1014 #ifdef CONFIG_PM
1015         udev->reset_resume = 1;
1016 #endif
1017         usb_set_intfdata(interface, hif_dev);
1018
1019         hif_dev->htc_handle = ath9k_htc_hw_alloc(hif_dev, &hif_usb,
1020                                                  &hif_dev->udev->dev);
1021         if (hif_dev->htc_handle == NULL) {
1022                 ret = -ENOMEM;
1023                 goto err_htc_hw_alloc;
1024         }
1025
1026         /* Find out which firmware to load */
1027
1028         if (IS_AR7010_DEVICE(id->driver_info))
1029                 if (le16_to_cpu(udev->descriptor.bcdDevice) == 0x0202)
1030                         hif_dev->fw_name = FIRMWARE_AR7010_1_1;
1031                 else
1032                         hif_dev->fw_name = FIRMWARE_AR7010;
1033         else
1034                 hif_dev->fw_name = FIRMWARE_AR9271;
1035
1036         ret = ath9k_hif_usb_dev_init(hif_dev, id->driver_info);
1037         if (ret) {
1038                 ret = -EINVAL;
1039                 goto err_hif_init_usb;
1040         }
1041
1042         ret = ath9k_htc_hw_init(hif_dev->htc_handle,
1043                                 &interface->dev, hif_dev->device_id,
1044                                 hif_dev->udev->product, id->driver_info);
1045         if (ret) {
1046                 ret = -EINVAL;
1047                 goto err_htc_hw_init;
1048         }
1049
1050         dev_info(&hif_dev->udev->dev, "ath9k_htc: USB layer initialized\n");
1051
1052         return 0;
1053
1054 err_htc_hw_init:
1055         ath9k_hif_usb_dev_deinit(hif_dev);
1056 err_hif_init_usb:
1057         ath9k_htc_hw_free(hif_dev->htc_handle);
1058 err_htc_hw_alloc:
1059         usb_set_intfdata(interface, NULL);
1060         kfree(hif_dev);
1061         usb_put_dev(udev);
1062 err_alloc:
1063         return ret;
1064 }
1065
1066 static void ath9k_hif_usb_reboot(struct usb_device *udev)
1067 {
1068         u32 reboot_cmd = 0xffffffff;
1069         void *buf;
1070         int ret;
1071
1072         buf = kmemdup(&reboot_cmd, 4, GFP_KERNEL);
1073         if (!buf)
1074                 return;
1075
1076         ret = usb_bulk_msg(udev, usb_sndbulkpipe(udev, USB_REG_OUT_PIPE),
1077                            buf, 4, NULL, HZ);
1078         if (ret)
1079                 dev_err(&udev->dev, "ath9k_htc: USB reboot failed\n");
1080
1081         kfree(buf);
1082 }
1083
1084 static void ath9k_hif_usb_disconnect(struct usb_interface *interface)
1085 {
1086         struct usb_device *udev = interface_to_usbdev(interface);
1087         struct hif_device_usb *hif_dev = usb_get_intfdata(interface);
1088         bool unplugged = (udev->state == USB_STATE_NOTATTACHED) ? true : false;
1089
1090         if (!hif_dev)
1091                 return;
1092
1093         ath9k_htc_hw_deinit(hif_dev->htc_handle, unplugged);
1094         ath9k_htc_hw_free(hif_dev->htc_handle);
1095         ath9k_hif_usb_dev_deinit(hif_dev);
1096         usb_set_intfdata(interface, NULL);
1097
1098         if (!unplugged && (hif_dev->flags & HIF_USB_START))
1099                 ath9k_hif_usb_reboot(udev);
1100
1101         kfree(hif_dev);
1102         dev_info(&udev->dev, "ath9k_htc: USB layer deinitialized\n");
1103         usb_put_dev(udev);
1104 }
1105
1106 #ifdef CONFIG_PM
1107 static int ath9k_hif_usb_suspend(struct usb_interface *interface,
1108                                  pm_message_t message)
1109 {
1110         struct hif_device_usb *hif_dev = usb_get_intfdata(interface);
1111
1112         /*
1113          * The device has to be set to FULLSLEEP mode in case no
1114          * interface is up.
1115          */
1116         if (!(hif_dev->flags & HIF_USB_START))
1117                 ath9k_htc_suspend(hif_dev->htc_handle);
1118
1119         ath9k_hif_usb_dealloc_urbs(hif_dev);
1120
1121         return 0;
1122 }
1123
1124 static int ath9k_hif_usb_resume(struct usb_interface *interface)
1125 {
1126         struct hif_device_usb *hif_dev = usb_get_intfdata(interface);
1127         struct htc_target *htc_handle = hif_dev->htc_handle;
1128         int ret;
1129
1130         ret = ath9k_hif_usb_alloc_urbs(hif_dev);
1131         if (ret)
1132                 return ret;
1133
1134         if (hif_dev->firmware) {
1135                 ret = ath9k_hif_usb_download_fw(hif_dev,
1136                                 htc_handle->drv_priv->ah->hw_version.usbdev);
1137                 if (ret)
1138                         goto fail_resume;
1139         } else {
1140                 ath9k_hif_usb_dealloc_urbs(hif_dev);
1141                 return -EIO;
1142         }
1143
1144         mdelay(100);
1145
1146         ret = ath9k_htc_resume(htc_handle);
1147
1148         if (ret)
1149                 goto fail_resume;
1150
1151         return 0;
1152
1153 fail_resume:
1154         ath9k_hif_usb_dealloc_urbs(hif_dev);
1155
1156         return ret;
1157 }
1158 #endif
1159
1160 static struct usb_driver ath9k_hif_usb_driver = {
1161         .name = KBUILD_MODNAME,
1162         .probe = ath9k_hif_usb_probe,
1163         .disconnect = ath9k_hif_usb_disconnect,
1164 #ifdef CONFIG_PM
1165         .suspend = ath9k_hif_usb_suspend,
1166         .resume = ath9k_hif_usb_resume,
1167         .reset_resume = ath9k_hif_usb_resume,
1168 #endif
1169         .id_table = ath9k_hif_usb_ids,
1170         .soft_unbind = 1,
1171 };
1172
1173 int ath9k_hif_usb_init(void)
1174 {
1175         return usb_register(&ath9k_hif_usb_driver);
1176 }
1177
1178 void ath9k_hif_usb_exit(void)
1179 {
1180         usb_deregister(&ath9k_hif_usb_driver);
1181 }