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         { },
  56 };
  57
  58 MODULE_DEVICE_TABLE(usb, ath9k_hif_usb_ids);
  59
  60 static int __hif_usb_tx(struct hif_device_usb *hif_dev);
  61
  62 static void hif_usb_regout_cb(struct urb *urb)
  63 {
  64         struct cmd_buf *cmd = (struct cmd_buf *)urb->context;
  65
  66         switch (urb->status) {
  67         case 0:
  68                 break;
  69         case -ENOENT:
  70         case -ECONNRESET:
  71         case -ENODEV:
  72         case -ESHUTDOWN:
  73                 goto free;
  74         default:
  75                 break;
  76         }
  77
  78         if (cmd) {
  79                 ath9k_htc_txcompletion_cb(cmd->hif_dev->htc_handle,
  80                                           cmd->skb, 1);
  81                 kfree(cmd);
  82         }
  83
  84         return;
  85 free:
  86         kfree_skb(cmd->skb);
  87         kfree(cmd);
  88 }
  89
  90 static int hif_usb_send_regout(struct hif_device_usb *hif_dev,
  91                                struct sk_buff *skb)
  92 {
  93         struct urb *urb;
  94         struct cmd_buf *cmd;
  95         int ret = 0;
  96
  97         urb = usb_alloc_urb(0, GFP_KERNEL);
  98         if (urb == NULL)
  99                 return -ENOMEM;
 100
 101         cmd = kzalloc(sizeof(*cmd), GFP_KERNEL);
 102         if (cmd == NULL) {
 103                 usb_free_urb(urb);
 104                 return -ENOMEM;
 105         }
 106
 107         cmd->skb = skb;
 108         cmd->hif_dev = hif_dev;
 109
 110         usb_fill_bulk_urb(urb, hif_dev->udev,
 111                          usb_sndbulkpipe(hif_dev->udev, USB_REG_OUT_PIPE),
 112                          skb->data, skb->len,
 113                          hif_usb_regout_cb, cmd);
 114
 115         usb_anchor_urb(urb, &hif_dev->regout_submitted);
 116         ret = usb_submit_urb(urb, GFP_KERNEL);
 117         if (ret) {
 118                 usb_unanchor_urb(urb);
 119                 kfree(cmd);
 120         }
 121         usb_free_urb(urb);
 122
 123         return ret;
 124 }
 125
 126 static inline void ath9k_skb_queue_purge(struct hif_device_usb *hif_dev,
 127                                          struct sk_buff_head *list)
 128 {
 129         struct sk_buff *skb;
 130
 131         while ((skb = __skb_dequeue(list)) != NULL) {
 132                 dev_kfree_skb_any(skb);
 133                 TX_STAT_INC(skb_dropped);
 134         }
 135 }
 136
 137 static void hif_usb_tx_cb(struct urb *urb)
 138 {
 139         struct tx_buf *tx_buf = (struct tx_buf *) urb->context;
 140         struct hif_device_usb *hif_dev;
 141         struct sk_buff *skb;
 142
 143         if (!tx_buf || !tx_buf->hif_dev)
 144                 return;
 145
 146         hif_dev = tx_buf->hif_dev;
 147
 148         switch (urb->status) {
 149         case 0:
 150                 break;
 151         case -ENOENT:
 152         case -ECONNRESET:
 153         case -ENODEV:
 154         case -ESHUTDOWN:
 155                 /*
 156                  * The URB has been killed, free the SKBs.
 157                  */
 158                 ath9k_skb_queue_purge(hif_dev, &tx_buf->skb_queue);
 159
 160                 /*
 161                  * If the URBs are being flushed, no need to add this
 162                  * URB to the free list.
 163                  */
 164                 spin_lock(&hif_dev->tx.tx_lock);
 165                 if (hif_dev->tx.flags & HIF_USB_TX_FLUSH) {
 166                         spin_unlock(&hif_dev->tx.tx_lock);
 167                         return;
 168                 }
 169                 spin_unlock(&hif_dev->tx.tx_lock);
 170
 171                 /*
 172                  * In the stop() case, this URB has to be added to
 173                  * the free list.
 174                  */
 175                 goto add_free;
 176         default:
 177                 break;
 178         }
 179
 180         /*
 181          * Check if TX has been stopped, this is needed because
 182          * this CB could have been invoked just after the TX lock
 183          * was released in hif_stop() and kill_urb() hasn't been
 184          * called yet.
 185          */
 186         spin_lock(&hif_dev->tx.tx_lock);
 187         if (hif_dev->tx.flags & HIF_USB_TX_STOP) {
 188                 spin_unlock(&hif_dev->tx.tx_lock);
 189                 ath9k_skb_queue_purge(hif_dev, &tx_buf->skb_queue);
 190                 goto add_free;
 191         }
 192         spin_unlock(&hif_dev->tx.tx_lock);
 193
 194         /* Complete the queued SKBs. */
 195         while ((skb = __skb_dequeue(&tx_buf->skb_queue)) != NULL) {
 196                 ath9k_htc_txcompletion_cb(hif_dev->htc_handle,
 197                                           skb, 1);
 198                 TX_STAT_INC(skb_completed);
 199         }
 200
 201 add_free:
 202         /* Re-initialize the SKB queue */
 203         tx_buf->len = tx_buf->offset = 0;
 204         __skb_queue_head_init(&tx_buf->skb_queue);
 205
 206         /* Add this TX buffer to the free list */
 207         spin_lock(&hif_dev->tx.tx_lock);
 208         list_move_tail(&tx_buf->list, &hif_dev->tx.tx_buf);
 209         hif_dev->tx.tx_buf_cnt++;
 210         if (!(hif_dev->tx.flags & HIF_USB_TX_STOP))
 211                 __hif_usb_tx(hif_dev); /* Check for pending SKBs */
 212         TX_STAT_INC(buf_completed);
 213         spin_unlock(&hif_dev->tx.tx_lock);
 214 }
 215
 216 /* TX lock has to be taken */
 217 static int __hif_usb_tx(struct hif_device_usb *hif_dev)
 218 {
 219         struct tx_buf *tx_buf = NULL;
 220         struct sk_buff *nskb = NULL;
 221         int ret = 0, i;
 222         u16 tx_skb_cnt = 0;
 223         u8 *buf;
 224         __le16 *hdr;
 225
 226         if (hif_dev->tx.tx_skb_cnt == 0)
 227                 return 0;
 228
 229         /* Check if a free TX buffer is available */
 230         if (list_empty(&hif_dev->tx.tx_buf))
 231                 return 0;
 232
 233         tx_buf = list_first_entry(&hif_dev->tx.tx_buf, struct tx_buf, list);
 234         list_move_tail(&tx_buf->list, &hif_dev->tx.tx_pending);
 235         hif_dev->tx.tx_buf_cnt--;
 236
 237         tx_skb_cnt = min_t(u16, hif_dev->tx.tx_skb_cnt, MAX_TX_AGGR_NUM);
 238
 239         for (i = 0; i < tx_skb_cnt; i++) {
 240                 nskb = __skb_dequeue(&hif_dev->tx.tx_skb_queue);
 241
 242                 /* Should never be NULL */
 243                 BUG_ON(!nskb);
 244
 245                 hif_dev->tx.tx_skb_cnt--;
 246
 247                 buf = tx_buf->buf;
 248                 buf += tx_buf->offset;
 249                 hdr = (__le16 *)buf;
 250                 *hdr++ = cpu_to_le16(nskb->len);
 251                 *hdr++ = cpu_to_le16(ATH_USB_TX_STREAM_MODE_TAG);
 252                 buf += 4;
 253                 memcpy(buf, nskb->data, nskb->len);
 254                 tx_buf->len = nskb->len + 4;
 255
 256                 if (i < (tx_skb_cnt - 1))
 257                         tx_buf->offset += (((tx_buf->len - 1) / 4) + 1) * 4;
 258
 259                 if (i == (tx_skb_cnt - 1))
 260                         tx_buf->len += tx_buf->offset;
 261
 262                 __skb_queue_tail(&tx_buf->skb_queue, nskb);
 263                 TX_STAT_INC(skb_queued);
 264         }
 265
 266         usb_fill_bulk_urb(tx_buf->urb, hif_dev->udev,
 267                           usb_sndbulkpipe(hif_dev->udev, USB_WLAN_TX_PIPE),
 268                           tx_buf->buf, tx_buf->len,
 269                           hif_usb_tx_cb, tx_buf);
 270
 271         ret = usb_submit_urb(tx_buf->urb, GFP_ATOMIC);
 272         if (ret) {
 273                 tx_buf->len = tx_buf->offset = 0;
 274                 ath9k_skb_queue_purge(hif_dev, &tx_buf->skb_queue);
 275                 __skb_queue_head_init(&tx_buf->skb_queue);
 276                 list_move_tail(&tx_buf->list, &hif_dev->tx.tx_buf);
 277                 hif_dev->tx.tx_buf_cnt++;
 278         }
 279
 280         if (!ret)
 281                 TX_STAT_INC(buf_queued);
 282
 283         return ret;
 284 }
 285
 286 static int hif_usb_send_tx(struct hif_device_usb *hif_dev, struct sk_buff *skb,
 287                            struct ath9k_htc_tx_ctl *tx_ctl)
 288 {
 289         unsigned long flags;
 290
 291         spin_lock_irqsave(&hif_dev->tx.tx_lock, flags);
 292
 293         if (hif_dev->tx.flags & HIF_USB_TX_STOP) {
 294                 spin_unlock_irqrestore(&hif_dev->tx.tx_lock, flags);
 295                 return -ENODEV;
 296         }
 297
 298         /* Check if the max queue count has been reached */
 299         if (hif_dev->tx.tx_skb_cnt > MAX_TX_BUF_NUM) {
 300                 spin_unlock_irqrestore(&hif_dev->tx.tx_lock, flags);
 301                 return -ENOMEM;
 302         }
 303
 304         __skb_queue_tail(&hif_dev->tx.tx_skb_queue, skb);
 305         hif_dev->tx.tx_skb_cnt++;
 306
 307         /* Send normal frames immediately */
 308         if (!tx_ctl || (tx_ctl && (tx_ctl->type == ATH9K_HTC_NORMAL)))
 309                 __hif_usb_tx(hif_dev);
 310
 311         /* Check if AMPDUs have to be sent immediately */
 312         if (tx_ctl && (tx_ctl->type == ATH9K_HTC_AMPDU) &&
 313             (hif_dev->tx.tx_buf_cnt == MAX_TX_URB_NUM) &&
 314             (hif_dev->tx.tx_skb_cnt < 2)) {
 315                 __hif_usb_tx(hif_dev);
 316         }
 317
 318         spin_unlock_irqrestore(&hif_dev->tx.tx_lock, flags);
 319
 320         return 0;
 321 }
 322
 323 static void hif_usb_start(void *hif_handle, u8 pipe_id)
 324 {
 325         struct hif_device_usb *hif_dev = (struct hif_device_usb *)hif_handle;
 326         unsigned long flags;
 327
 328         hif_dev->flags |= HIF_USB_START;
 329
 330         spin_lock_irqsave(&hif_dev->tx.tx_lock, flags);
 331         hif_dev->tx.flags &= ~HIF_USB_TX_STOP;
 332         spin_unlock_irqrestore(&hif_dev->tx.tx_lock, flags);
 333 }
 334
 335 static void hif_usb_stop(void *hif_handle, u8 pipe_id)
 336 {
 337         struct hif_device_usb *hif_dev = (struct hif_device_usb *)hif_handle;
 338         struct tx_buf *tx_buf = NULL, *tx_buf_tmp = NULL;
 339         unsigned long flags;
 340
 341         spin_lock_irqsave(&hif_dev->tx.tx_lock, flags);
 342         ath9k_skb_queue_purge(hif_dev, &hif_dev->tx.tx_skb_queue);
 343         hif_dev->tx.tx_skb_cnt = 0;
 344         hif_dev->tx.flags |= HIF_USB_TX_STOP;
 345         spin_unlock_irqrestore(&hif_dev->tx.tx_lock, flags);
 346
 347         /* The pending URBs have to be canceled. */
 348         list_for_each_entry_safe(tx_buf, tx_buf_tmp,
 349                                  &hif_dev->tx.tx_pending, list) {
 350                 usb_kill_urb(tx_buf->urb);
 351         }
 352 }
 353
 354 static int hif_usb_send(void *hif_handle, u8 pipe_id, struct sk_buff *skb,
 355                         struct ath9k_htc_tx_ctl *tx_ctl)
 356 {
 357         struct hif_device_usb *hif_dev = (struct hif_device_usb *)hif_handle;
 358         int ret = 0;
 359
 360         switch (pipe_id) {
 361         case USB_WLAN_TX_PIPE:
 362                 ret = hif_usb_send_tx(hif_dev, skb, tx_ctl);
 363                 break;
 364         case USB_REG_OUT_PIPE:
 365                 ret = hif_usb_send_regout(hif_dev, skb);
 366                 break;
 367         default:
 368                 dev_err(&hif_dev->udev->dev,
 369                         "ath9k_htc: Invalid TX pipe: %d\n", pipe_id);
 370                 ret = -EINVAL;
 371                 break;
 372         }
 373
 374         return ret;
 375 }
 376
 377 static struct ath9k_htc_hif hif_usb = {
 378         .transport = ATH9K_HIF_USB,
 379         .name = "ath9k_hif_usb",
 380
 381         .control_ul_pipe = USB_REG_OUT_PIPE,
 382         .control_dl_pipe = USB_REG_IN_PIPE,
 383
 384         .start = hif_usb_start,
 385         .stop = hif_usb_stop,
 386         .send = hif_usb_send,
 387 };
 388
 389 static void ath9k_hif_usb_rx_stream(struct hif_device_usb *hif_dev,
 390                                     struct sk_buff *skb)
 391 {
 392         struct sk_buff *nskb, *skb_pool[MAX_PKT_NUM_IN_TRANSFER];
 393         int index = 0, i = 0, len = skb->len;
 394         int rx_remain_len, rx_pkt_len;
 395         u16 pool_index = 0;
 396         u8 *ptr;
 397
 398         spin_lock(&hif_dev->rx_lock);
 399
 400         rx_remain_len = hif_dev->rx_remain_len;
 401         rx_pkt_len = hif_dev->rx_transfer_len;
 402
 403         if (rx_remain_len != 0) {
 404                 struct sk_buff *remain_skb = hif_dev->remain_skb;
 405
 406                 if (remain_skb) {
 407                         ptr = (u8 *) remain_skb->data;
 408
 409                         index = rx_remain_len;
 410                         rx_remain_len -= hif_dev->rx_pad_len;
 411                         ptr += rx_pkt_len;
 412
 413                         memcpy(ptr, skb->data, rx_remain_len);
 414
 415                         rx_pkt_len += rx_remain_len;
 416                         hif_dev->rx_remain_len = 0;
 417                         skb_put(remain_skb, rx_pkt_len);
 418
 419                         skb_pool[pool_index++] = remain_skb;
 420
 421                 } else {
 422                         index = rx_remain_len;
 423                 }
 424         }
 425
 426         spin_unlock(&hif_dev->rx_lock);
 427
 428         while (index < len) {
 429                 u16 pkt_len;
 430                 u16 pkt_tag;
 431                 u16 pad_len;
 432                 int chk_idx;
 433
 434                 ptr = (u8 *) skb->data;
 435
 436                 pkt_len = ptr[index] + (ptr[index+1] << 8);
 437                 pkt_tag = ptr[index+2] + (ptr[index+3] << 8);
 438
 439                 if (pkt_tag != ATH_USB_RX_STREAM_MODE_TAG) {
 440                         RX_STAT_INC(skb_dropped);
 441                         return;
 442                 }
 443
 444                 pad_len = 4 - (pkt_len & 0x3);
 445                 if (pad_len == 4)
 446                         pad_len = 0;
 447
 448                 chk_idx = index;
 449                 index = index + 4 + pkt_len + pad_len;
 450
 451                 if (index > MAX_RX_BUF_SIZE) {
 452                         spin_lock(&hif_dev->rx_lock);
 453                         hif_dev->rx_remain_len = index - MAX_RX_BUF_SIZE;
 454                         hif_dev->rx_transfer_len =
 455                                 MAX_RX_BUF_SIZE - chk_idx - 4;
 456                         hif_dev->rx_pad_len = pad_len;
 457
 458                         nskb = __dev_alloc_skb(pkt_len + 32, GFP_ATOMIC);
 459                         if (!nskb) {
 460                                 dev_err(&hif_dev->udev->dev,
 461                                         "ath9k_htc: RX memory allocation error\n");
 462                                 spin_unlock(&hif_dev->rx_lock);
 463                                 goto err;
 464                         }
 465                         skb_reserve(nskb, 32);
 466                         RX_STAT_INC(skb_allocated);
 467
 468                         memcpy(nskb->data, &(skb->data[chk_idx+4]),
 469                                hif_dev->rx_transfer_len);
 470
 471                         /* Record the buffer pointer */
 472                         hif_dev->remain_skb = nskb;
 473                         spin_unlock(&hif_dev->rx_lock);
 474                 } else {
 475                         nskb = __dev_alloc_skb(pkt_len + 32, GFP_ATOMIC);
 476                         if (!nskb) {
 477                                 dev_err(&hif_dev->udev->dev,
 478                                         "ath9k_htc: RX memory allocation error\n");
 479                                 goto err;
 480                         }
 481                         skb_reserve(nskb, 32);
 482                         RX_STAT_INC(skb_allocated);
 483
 484                         memcpy(nskb->data, &(skb->data[chk_idx+4]), pkt_len);
 485                         skb_put(nskb, pkt_len);
 486                         skb_pool[pool_index++] = nskb;
 487                 }
 488         }
 489
 490 err:
 491         for (i = 0; i < pool_index; i++) {
 492                 ath9k_htc_rx_msg(hif_dev->htc_handle, skb_pool[i],
 493                                  skb_pool[i]->len, USB_WLAN_RX_PIPE);
 494                 RX_STAT_INC(skb_completed);
 495         }
 496 }
 497
 498 static void ath9k_hif_usb_rx_cb(struct urb *urb)
 499 {
 500         struct sk_buff *skb = (struct sk_buff *) urb->context;
 501         struct hif_device_usb *hif_dev =
 502                 usb_get_intfdata(usb_ifnum_to_if(urb->dev, 0));
 503         int ret;
 504
 505         if (!skb)
 506                 return;
 507
 508         if (!hif_dev)
 509                 goto free;
 510
 511         switch (urb->status) {
 512         case 0:
 513                 break;
 514         case -ENOENT:
 515         case -ECONNRESET:
 516         case -ENODEV:
 517         case -ESHUTDOWN:
 518                 goto free;
 519         default:
 520                 goto resubmit;
 521         }
 522
 523         if (likely(urb->actual_length != 0)) {
 524                 skb_put(skb, urb->actual_length);
 525                 ath9k_hif_usb_rx_stream(hif_dev, skb);
 526         }
 527
 528 resubmit:
 529         skb_reset_tail_pointer(skb);
 530         skb_trim(skb, 0);
 531
 532         usb_anchor_urb(urb, &hif_dev->rx_submitted);
 533         ret = usb_submit_urb(urb, GFP_ATOMIC);
 534         if (ret) {
 535                 usb_unanchor_urb(urb);
 536                 goto free;
 537         }
 538
 539         return;
 540 free:
 541         kfree_skb(skb);
 542 }
 543
 544 static void ath9k_hif_usb_reg_in_cb(struct urb *urb)
 545 {
 546         struct sk_buff *skb = (struct sk_buff *) urb->context;
 547         struct sk_buff *nskb;
 548         struct hif_device_usb *hif_dev =
 549                 usb_get_intfdata(usb_ifnum_to_if(urb->dev, 0));
 550         int ret;
 551
 552         if (!skb)
 553                 return;
 554
 555         if (!hif_dev)
 556                 goto free;
 557
 558         switch (urb->status) {
 559         case 0:
 560                 break;
 561         case -ENOENT:
 562         case -ECONNRESET:
 563         case -ENODEV:
 564         case -ESHUTDOWN:
 565                 goto free;
 566         default:
 567                 goto resubmit;
 568         }
 569
 570         if (likely(urb->actual_length != 0)) {
 571                 skb_put(skb, urb->actual_length);
 572
 573                 /* Process the command first */
 574                 ath9k_htc_rx_msg(hif_dev->htc_handle, skb,
 575                                  skb->len, USB_REG_IN_PIPE);
 576
 577
 578                 nskb = alloc_skb(MAX_REG_IN_BUF_SIZE, GFP_ATOMIC);
 579                 if (!nskb) {
 580                         dev_err(&hif_dev->udev->dev,
 581                                 "ath9k_htc: REG_IN memory allocation failure\n");
 582                         urb->context = NULL;
 583                         return;
 584                 }
 585
 586                 usb_fill_bulk_urb(urb, hif_dev->udev,
 587                                  usb_rcvbulkpipe(hif_dev->udev,
 588                                                  USB_REG_IN_PIPE),
 589                                  nskb->data, MAX_REG_IN_BUF_SIZE,
 590                                  ath9k_hif_usb_reg_in_cb, nskb);
 591
 592                 ret = usb_submit_urb(urb, GFP_ATOMIC);
 593                 if (ret) {
 594                         kfree_skb(nskb);
 595                         urb->context = NULL;
 596                 }
 597
 598                 return;
 599         }
 600
 601 resubmit:
 602         skb_reset_tail_pointer(skb);
 603         skb_trim(skb, 0);
 604
 605         ret = usb_submit_urb(urb, GFP_ATOMIC);
 606         if (ret)
 607                 goto free;
 608
 609         return;
 610 free:
 611         kfree_skb(skb);
 612         urb->context = NULL;
 613 }
 614
 615 static void ath9k_hif_usb_dealloc_tx_urbs(struct hif_device_usb *hif_dev)
 616 {
 617         struct tx_buf *tx_buf = NULL, *tx_buf_tmp = NULL;
 618         unsigned long flags;
 619
 620         list_for_each_entry_safe(tx_buf, tx_buf_tmp,
 621                                  &hif_dev->tx.tx_buf, list) {
 622                 usb_kill_urb(tx_buf->urb);
 623                 list_del(&tx_buf->list);
 624                 usb_free_urb(tx_buf->urb);
 625                 kfree(tx_buf->buf);
 626                 kfree(tx_buf);
 627         }
 628
 629         spin_lock_irqsave(&hif_dev->tx.tx_lock, flags);
 630         hif_dev->tx.flags |= HIF_USB_TX_FLUSH;
 631         spin_unlock_irqrestore(&hif_dev->tx.tx_lock, flags);
 632
 633         list_for_each_entry_safe(tx_buf, tx_buf_tmp,
 634                                  &hif_dev->tx.tx_pending, list) {
 635                 usb_kill_urb(tx_buf->urb);
 636                 list_del(&tx_buf->list);
 637                 usb_free_urb(tx_buf->urb);
 638                 kfree(tx_buf->buf);
 639                 kfree(tx_buf);
 640         }
 641 }
 642
 643 static int ath9k_hif_usb_alloc_tx_urbs(struct hif_device_usb *hif_dev)
 644 {
 645         struct tx_buf *tx_buf;
 646         int i;
 647
 648         INIT_LIST_HEAD(&hif_dev->tx.tx_buf);
 649         INIT_LIST_HEAD(&hif_dev->tx.tx_pending);
 650         spin_lock_init(&hif_dev->tx.tx_lock);
 651         __skb_queue_head_init(&hif_dev->tx.tx_skb_queue);
 652
 653         for (i = 0; i < MAX_TX_URB_NUM; i++) {
 654                 tx_buf = kzalloc(sizeof(struct tx_buf), GFP_KERNEL);
 655                 if (!tx_buf)
 656                         goto err;
 657
 658                 tx_buf->buf = kzalloc(MAX_TX_BUF_SIZE, GFP_KERNEL);
 659                 if (!tx_buf->buf)
 660                         goto err;
 661
 662                 tx_buf->urb = usb_alloc_urb(0, GFP_KERNEL);
 663                 if (!tx_buf->urb)
 664                         goto err;
 665
 666                 tx_buf->hif_dev = hif_dev;
 667                 __skb_queue_head_init(&tx_buf->skb_queue);
 668
 669                 list_add_tail(&tx_buf->list, &hif_dev->tx.tx_buf);
 670         }
 671
 672         hif_dev->tx.tx_buf_cnt = MAX_TX_URB_NUM;
 673
 674         return 0;
 675 err:
 676         if (tx_buf) {
 677                 kfree(tx_buf->buf);
 678                 kfree(tx_buf);
 679         }
 680         ath9k_hif_usb_dealloc_tx_urbs(hif_dev);
 681         return -ENOMEM;
 682 }
 683
 684 static void ath9k_hif_usb_dealloc_rx_urbs(struct hif_device_usb *hif_dev)
 685 {
 686         usb_kill_anchored_urbs(&hif_dev->rx_submitted);
 687 }
 688
 689 static int ath9k_hif_usb_alloc_rx_urbs(struct hif_device_usb *hif_dev)
 690 {
 691         struct urb *urb = NULL;
 692         struct sk_buff *skb = NULL;
 693         int i, ret;
 694
 695         init_usb_anchor(&hif_dev->rx_submitted);
 696         spin_lock_init(&hif_dev->rx_lock);
 697
 698         for (i = 0; i < MAX_RX_URB_NUM; i++) {
 699
 700                 /* Allocate URB */
 701                 urb = usb_alloc_urb(0, GFP_KERNEL);
 702                 if (urb == NULL) {
 703                         ret = -ENOMEM;
 704                         goto err_urb;
 705                 }
 706
 707                 /* Allocate buffer */
 708                 skb = alloc_skb(MAX_RX_BUF_SIZE, GFP_KERNEL);
 709                 if (!skb) {
 710                         ret = -ENOMEM;
 711                         goto err_skb;
 712                 }
 713
 714                 usb_fill_bulk_urb(urb, hif_dev->udev,
 715                                   usb_rcvbulkpipe(hif_dev->udev,
 716                                                   USB_WLAN_RX_PIPE),
 717                                   skb->data, MAX_RX_BUF_SIZE,
 718                                   ath9k_hif_usb_rx_cb, skb);
 719
 720                 /* Anchor URB */
 721                 usb_anchor_urb(urb, &hif_dev->rx_submitted);
 722
 723                 /* Submit URB */
 724                 ret = usb_submit_urb(urb, GFP_KERNEL);
 725                 if (ret) {
 726                         usb_unanchor_urb(urb);
 727                         goto err_submit;
 728                 }
 729
 730                 /*
 731                  * Drop reference count.
 732                  * This ensures that the URB is freed when killing them.
 733                  */
 734                 usb_free_urb(urb);
 735         }
 736
 737         return 0;
 738
 739 err_submit:
 740         kfree_skb(skb);
 741 err_skb:
 742         usb_free_urb(urb);
 743 err_urb:
 744         ath9k_hif_usb_dealloc_rx_urbs(hif_dev);
 745         return ret;
 746 }
 747
 748 static void ath9k_hif_usb_dealloc_reg_in_urb(struct hif_device_usb *hif_dev)
 749 {
 750         if (hif_dev->reg_in_urb) {
 751                 usb_kill_urb(hif_dev->reg_in_urb);
 752                 if (hif_dev->reg_in_urb->context)
 753                         kfree_skb((void *)hif_dev->reg_in_urb->context);
 754                 usb_free_urb(hif_dev->reg_in_urb);
 755                 hif_dev->reg_in_urb = NULL;
 756         }
 757 }
 758
 759 static int ath9k_hif_usb_alloc_reg_in_urb(struct hif_device_usb *hif_dev)
 760 {
 761         struct sk_buff *skb;
 762
 763         hif_dev->reg_in_urb = usb_alloc_urb(0, GFP_KERNEL);
 764         if (hif_dev->reg_in_urb == NULL)
 765                 return -ENOMEM;
 766
 767         skb = alloc_skb(MAX_REG_IN_BUF_SIZE, GFP_KERNEL);
 768         if (!skb)
 769                 goto err;
 770
 771         usb_fill_bulk_urb(hif_dev->reg_in_urb, hif_dev->udev,
 772                          usb_rcvbulkpipe(hif_dev->udev,
 773                                          USB_REG_IN_PIPE),
 774                          skb->data, MAX_REG_IN_BUF_SIZE,
 775                          ath9k_hif_usb_reg_in_cb, skb);
 776
 777         if (usb_submit_urb(hif_dev->reg_in_urb, GFP_KERNEL) != 0)
 778                 goto err;
 779
 780         return 0;
 781
 782 err:
 783         ath9k_hif_usb_dealloc_reg_in_urb(hif_dev);
 784         return -ENOMEM;
 785 }
 786
 787 static int ath9k_hif_usb_alloc_urbs(struct hif_device_usb *hif_dev)
 788 {
 789         /* Register Write */
 790         init_usb_anchor(&hif_dev->regout_submitted);
 791
 792         /* TX */
 793         if (ath9k_hif_usb_alloc_tx_urbs(hif_dev) < 0)
 794                 goto err;
 795
 796         /* RX */
 797         if (ath9k_hif_usb_alloc_rx_urbs(hif_dev) < 0)
 798                 goto err_rx;
 799
 800         /* Register Read */
 801         if (ath9k_hif_usb_alloc_reg_in_urb(hif_dev) < 0)
 802                 goto err_reg;
 803
 804         return 0;
 805 err_reg:
 806         ath9k_hif_usb_dealloc_rx_urbs(hif_dev);
 807 err_rx:
 808         ath9k_hif_usb_dealloc_tx_urbs(hif_dev);
 809 err:
 810         return -ENOMEM;
 811 }
 812
 813 static void ath9k_hif_usb_dealloc_urbs(struct hif_device_usb *hif_dev)
 814 {
 815         usb_kill_anchored_urbs(&hif_dev->regout_submitted);
 816         ath9k_hif_usb_dealloc_reg_in_urb(hif_dev);
 817         ath9k_hif_usb_dealloc_tx_urbs(hif_dev);
 818         ath9k_hif_usb_dealloc_rx_urbs(hif_dev);
 819 }
 820
 821 static int ath9k_hif_usb_download_fw(struct hif_device_usb *hif_dev,
 822                                      u32 drv_info)
 823 {
 824         int transfer, err;
 825         const void *data = hif_dev->firmware->data;
 826         size_t len = hif_dev->firmware->size;
 827         u32 addr = AR9271_FIRMWARE;
 828         u8 *buf = kzalloc(4096, GFP_KERNEL);
 829         u32 firm_offset;
 830
 831         if (!buf)
 832                 return -ENOMEM;
 833
 834         while (len) {
 835                 transfer = min_t(int, len, 4096);
 836                 memcpy(buf, data, transfer);
 837
 838                 err = usb_control_msg(hif_dev->udev,
 839                                       usb_sndctrlpipe(hif_dev->udev, 0),
 840                                       FIRMWARE_DOWNLOAD, 0x40 | USB_DIR_OUT,
 841                                       addr >> 8, 0, buf, transfer, HZ);
 842                 if (err < 0) {
 843                         kfree(buf);
 844                         return err;
 845                 }
 846
 847                 len -= transfer;
 848                 data += transfer;
 849                 addr += transfer;
 850         }
 851         kfree(buf);
 852
 853         if (IS_AR7010_DEVICE(drv_info))
 854                 firm_offset = AR7010_FIRMWARE_TEXT;
 855         else
 856                 firm_offset = AR9271_FIRMWARE_TEXT;
 857
 858         /*
 859          * Issue FW download complete command to firmware.
 860          */
 861         err = usb_control_msg(hif_dev->udev, usb_sndctrlpipe(hif_dev->udev, 0),
 862                               FIRMWARE_DOWNLOAD_COMP,
 863                               0x40 | USB_DIR_OUT,
 864                               firm_offset >> 8, 0, NULL, 0, HZ);
 865         if (err)
 866                 return -EIO;
 867
 868         dev_info(&hif_dev->udev->dev, "ath9k_htc: Transferred FW: %s, size: %ld\n",
 869                  hif_dev->fw_name, (unsigned long) hif_dev->firmware->size);
 870
 871         return 0;
 872 }
 873
 874 static int ath9k_hif_usb_dev_init(struct hif_device_usb *hif_dev, u32 drv_info)
 875 {
 876         int ret, idx;
 877         struct usb_host_interface *alt = &hif_dev->interface->altsetting[0];
 878         struct usb_endpoint_descriptor *endp;
 879
 880         /* Request firmware */
 881         ret = request_firmware(&hif_dev->firmware, hif_dev->fw_name,
 882                                &hif_dev->udev->dev);
 883         if (ret) {
 884                 dev_err(&hif_dev->udev->dev,
 885                         "ath9k_htc: Firmware - %s not found\n", hif_dev->fw_name);
 886                 goto err_fw_req;
 887         }
 888
 889         /* Download firmware */
 890         ret = ath9k_hif_usb_download_fw(hif_dev, drv_info);
 891         if (ret) {
 892                 dev_err(&hif_dev->udev->dev,
 893                         "ath9k_htc: Firmware - %s download failed\n",
 894                         hif_dev->fw_name);
 895                 goto err_fw_download;
 896         }
 897
 898         /* On downloading the firmware to the target, the USB descriptor of EP4
 899          * is 'patched' to change the type of the endpoint to Bulk. This will
 900          * bring down CPU usage during the scan period.
 901          */
 902         for (idx = 0; idx < alt->desc.bNumEndpoints; idx++) {
 903                 endp = &alt->endpoint[idx].desc;
 904                 if ((endp->bmAttributes & USB_ENDPOINT_XFERTYPE_MASK)
 905                                 == USB_ENDPOINT_XFER_INT) {
 906                         endp->bmAttributes &= ~USB_ENDPOINT_XFERTYPE_MASK;
 907                         endp->bmAttributes |= USB_ENDPOINT_XFER_BULK;
 908                         endp->bInterval = 0;
 909                 }
 910         }
 911
 912         /* Alloc URBs */
 913         ret = ath9k_hif_usb_alloc_urbs(hif_dev);
 914         if (ret) {
 915                 dev_err(&hif_dev->udev->dev,
 916                         "ath9k_htc: Unable to allocate URBs\n");
 917                 goto err_urb;
 918         }
 919
 920         return 0;
 921
 922 err_urb:
 923         ath9k_hif_usb_dealloc_urbs(hif_dev);
 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 static int ath9k_hif_usb_probe(struct usb_interface *interface,
 939                                const struct usb_device_id *id)
 940 {
 941         struct usb_device *udev = interface_to_usbdev(interface);
 942         struct hif_device_usb *hif_dev;
 943         int ret = 0;
 944
 945         hif_dev = kzalloc(sizeof(struct hif_device_usb), GFP_KERNEL);
 946         if (!hif_dev) {
 947                 ret = -ENOMEM;
 948                 goto err_alloc;
 949         }
 950
 951         usb_get_dev(udev);
 952         hif_dev->udev = udev;
 953         hif_dev->interface = interface;
 954         hif_dev->device_id = id->idProduct;
 955 #ifdef CONFIG_PM
 956         udev->reset_resume = 1;
 957 #endif
 958         usb_set_intfdata(interface, hif_dev);
 959
 960         hif_dev->htc_handle = ath9k_htc_hw_alloc(hif_dev, &hif_usb,
 961                                                  &hif_dev->udev->dev);
 962         if (hif_dev->htc_handle == NULL) {
 963                 ret = -ENOMEM;
 964                 goto err_htc_hw_alloc;
 965         }
 966
 967         /* Find out which firmware to load */
 968
 969         if (IS_AR7010_DEVICE(id->driver_info))
 970                 if (le16_to_cpu(udev->descriptor.bcdDevice) == 0x0202)
 971                         hif_dev->fw_name = FIRMWARE_AR7010_1_1;
 972                 else
 973                         hif_dev->fw_name = FIRMWARE_AR7010;
 974         else
 975                 hif_dev->fw_name = FIRMWARE_AR9271;
 976
 977         ret = ath9k_hif_usb_dev_init(hif_dev, id->driver_info);
 978         if (ret) {
 979                 ret = -EINVAL;
 980                 goto err_hif_init_usb;
 981         }
 982
 983         ret = ath9k_htc_hw_init(hif_dev->htc_handle,
 984                                 &hif_dev->udev->dev, hif_dev->device_id,
 985                                 hif_dev->udev->product, id->driver_info);
 986         if (ret) {
 987                 ret = -EINVAL;
 988                 goto err_htc_hw_init;
 989         }
 990
 991         dev_info(&hif_dev->udev->dev, "ath9k_htc: USB layer initialized\n");
 992
 993         return 0;
 994
 995 err_htc_hw_init:
 996         ath9k_hif_usb_dev_deinit(hif_dev);
 997 err_hif_init_usb:
 998         ath9k_htc_hw_free(hif_dev->htc_handle);
 999 err_htc_hw_alloc:
1000         usb_set_intfdata(interface, NULL);
1001         kfree(hif_dev);
1002         usb_put_dev(udev);
1003 err_alloc:
1004         return ret;
1005 }
1006
1007 static void ath9k_hif_usb_reboot(struct usb_device *udev)
1008 {
1009         u32 reboot_cmd = 0xffffffff;
1010         void *buf;
1011         int ret;
1012
1013         buf = kmemdup(&reboot_cmd, 4, GFP_KERNEL);
1014         if (!buf)
1015                 return;
1016
1017         ret = usb_bulk_msg(udev, usb_sndbulkpipe(udev, USB_REG_OUT_PIPE),
1018                            buf, 4, NULL, HZ);
1019         if (ret)
1020                 dev_err(&udev->dev, "ath9k_htc: USB reboot failed\n");
1021
1022         kfree(buf);
1023 }
1024
1025 static void ath9k_hif_usb_disconnect(struct usb_interface *interface)
1026 {
1027         struct usb_device *udev = interface_to_usbdev(interface);
1028         struct hif_device_usb *hif_dev = usb_get_intfdata(interface);
1029         bool unplugged = (udev->state == USB_STATE_NOTATTACHED) ? true : false;
1030
1031         if (hif_dev) {
1032                 ath9k_htc_hw_deinit(hif_dev->htc_handle, unplugged);
1033                 ath9k_htc_hw_free(hif_dev->htc_handle);
1034                 ath9k_hif_usb_dev_deinit(hif_dev);
1035                 usb_set_intfdata(interface, NULL);
1036         }
1037
1038         if (!unplugged && (hif_dev->flags & HIF_USB_START))
1039                 ath9k_hif_usb_reboot(udev);
1040
1041         kfree(hif_dev);
1042         dev_info(&udev->dev, "ath9k_htc: USB layer deinitialized\n");
1043         usb_put_dev(udev);
1044 }
1045
1046 #ifdef CONFIG_PM
1047 static int ath9k_hif_usb_suspend(struct usb_interface *interface,
1048                                  pm_message_t message)
1049 {
1050         struct hif_device_usb *hif_dev = usb_get_intfdata(interface);
1051
1052         /*
1053          * The device has to be set to FULLSLEEP mode in case no
1054          * interface is up.
1055          */
1056         if (!(hif_dev->flags & HIF_USB_START))
1057                 ath9k_htc_suspend(hif_dev->htc_handle);
1058
1059         ath9k_hif_usb_dealloc_urbs(hif_dev);
1060
1061         return 0;
1062 }
1063
1064 static int ath9k_hif_usb_resume(struct usb_interface *interface)
1065 {
1066         struct hif_device_usb *hif_dev = usb_get_intfdata(interface);
1067         struct htc_target *htc_handle = hif_dev->htc_handle;
1068         int ret;
1069
1070         ret = ath9k_hif_usb_alloc_urbs(hif_dev);
1071         if (ret)
1072                 return ret;
1073
1074         if (hif_dev->firmware) {
1075                 ret = ath9k_hif_usb_download_fw(hif_dev,
1076                                 htc_handle->drv_priv->ah->hw_version.usbdev);
1077                 if (ret)
1078                         goto fail_resume;
1079         } else {
1080                 ath9k_hif_usb_dealloc_urbs(hif_dev);
1081                 return -EIO;
1082         }
1083
1084         mdelay(100);
1085
1086         ret = ath9k_htc_resume(htc_handle);
1087
1088         if (ret)
1089                 goto fail_resume;
1090
1091         return 0;
1092
1093 fail_resume:
1094         ath9k_hif_usb_dealloc_urbs(hif_dev);
1095
1096         return ret;
1097 }
1098 #endif
1099
1100 static struct usb_driver ath9k_hif_usb_driver = {
1101         .name = "ath9k_hif_usb",
1102         .probe = ath9k_hif_usb_probe,
1103         .disconnect = ath9k_hif_usb_disconnect,
1104 #ifdef CONFIG_PM
1105         .suspend = ath9k_hif_usb_suspend,
1106         .resume = ath9k_hif_usb_resume,
1107         .reset_resume = ath9k_hif_usb_resume,
1108 #endif
1109         .id_table = ath9k_hif_usb_ids,
1110         .soft_unbind = 1,
1111 };
1112
1113 int ath9k_hif_usb_init(void)
1114 {
1115         return usb_register(&ath9k_hif_usb_driver);
1116 }
1117
1118 void ath9k_hif_usb_exit(void)
1119 {
1120         usb_deregister(&ath9k_hif_usb_driver);
1121 }