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 *hdr, tx_skb_cnt = 0;
 223         u8 *buf;
 224
 225         if (hif_dev->tx.tx_skb_cnt == 0)
 226                 return 0;
 227
 228         /* Check if a free TX buffer is available */
 229         if (list_empty(&hif_dev->tx.tx_buf))
 230                 return 0;
 231
 232         tx_buf = list_first_entry(&hif_dev->tx.tx_buf, struct tx_buf, list);
 233         list_move_tail(&tx_buf->list, &hif_dev->tx.tx_pending);
 234         hif_dev->tx.tx_buf_cnt--;
 235
 236         tx_skb_cnt = min_t(u16, hif_dev->tx.tx_skb_cnt, MAX_TX_AGGR_NUM);
 237
 238         for (i = 0; i < tx_skb_cnt; i++) {
 239                 nskb = __skb_dequeue(&hif_dev->tx.tx_skb_queue);
 240
 241                 /* Should never be NULL */
 242                 BUG_ON(!nskb);
 243
 244                 hif_dev->tx.tx_skb_cnt--;
 245
 246                 buf = tx_buf->buf;
 247                 buf += tx_buf->offset;
 248                 hdr = (u16 *)buf;
 249                 *hdr++ = nskb->len;
 250                 *hdr++ = ATH_USB_TX_STREAM_MODE_TAG;
 251                 buf += 4;
 252                 memcpy(buf, nskb->data, nskb->len);
 253                 tx_buf->len = nskb->len + 4;
 254
 255                 if (i < (tx_skb_cnt - 1))
 256                         tx_buf->offset += (((tx_buf->len - 1) / 4) + 1) * 4;
 257
 258                 if (i == (tx_skb_cnt - 1))
 259                         tx_buf->len += tx_buf->offset;
 260
 261                 __skb_queue_tail(&tx_buf->skb_queue, nskb);
 262                 TX_STAT_INC(skb_queued);
 263         }
 264
 265         usb_fill_bulk_urb(tx_buf->urb, hif_dev->udev,
 266                           usb_sndbulkpipe(hif_dev->udev, USB_WLAN_TX_PIPE),
 267                           tx_buf->buf, tx_buf->len,
 268                           hif_usb_tx_cb, tx_buf);
 269
 270         ret = usb_submit_urb(tx_buf->urb, GFP_ATOMIC);
 271         if (ret) {
 272                 tx_buf->len = tx_buf->offset = 0;
 273                 ath9k_skb_queue_purge(hif_dev, &tx_buf->skb_queue);
 274                 __skb_queue_head_init(&tx_buf->skb_queue);
 275                 list_move_tail(&tx_buf->list, &hif_dev->tx.tx_buf);
 276                 hif_dev->tx.tx_buf_cnt++;
 277         }
 278
 279         if (!ret)
 280                 TX_STAT_INC(buf_queued);
 281
 282         return ret;
 283 }
 284
 285 static int hif_usb_send_tx(struct hif_device_usb *hif_dev, struct sk_buff *skb,
 286                            struct ath9k_htc_tx_ctl *tx_ctl)
 287 {
 288         unsigned long flags;
 289
 290         spin_lock_irqsave(&hif_dev->tx.tx_lock, flags);
 291
 292         if (hif_dev->tx.flags & HIF_USB_TX_STOP) {
 293                 spin_unlock_irqrestore(&hif_dev->tx.tx_lock, flags);
 294                 return -ENODEV;
 295         }
 296
 297         /* Check if the max queue count has been reached */
 298         if (hif_dev->tx.tx_skb_cnt > MAX_TX_BUF_NUM) {
 299                 spin_unlock_irqrestore(&hif_dev->tx.tx_lock, flags);
 300                 return -ENOMEM;
 301         }
 302
 303         __skb_queue_tail(&hif_dev->tx.tx_skb_queue, skb);
 304         hif_dev->tx.tx_skb_cnt++;
 305
 306         /* Send normal frames immediately */
 307         if (!tx_ctl || (tx_ctl && (tx_ctl->type == ATH9K_HTC_NORMAL)))
 308                 __hif_usb_tx(hif_dev);
 309
 310         /* Check if AMPDUs have to be sent immediately */
 311         if (tx_ctl && (tx_ctl->type == ATH9K_HTC_AMPDU) &&
 312             (hif_dev->tx.tx_buf_cnt == MAX_TX_URB_NUM) &&
 313             (hif_dev->tx.tx_skb_cnt < 2)) {
 314                 __hif_usb_tx(hif_dev);
 315         }
 316
 317         spin_unlock_irqrestore(&hif_dev->tx.tx_lock, flags);
 318
 319         return 0;
 320 }
 321
 322 static void hif_usb_start(void *hif_handle, u8 pipe_id)
 323 {
 324         struct hif_device_usb *hif_dev = (struct hif_device_usb *)hif_handle;
 325         unsigned long flags;
 326
 327         hif_dev->flags |= HIF_USB_START;
 328
 329         spin_lock_irqsave(&hif_dev->tx.tx_lock, flags);
 330         hif_dev->tx.flags &= ~HIF_USB_TX_STOP;
 331         spin_unlock_irqrestore(&hif_dev->tx.tx_lock, flags);
 332 }
 333
 334 static void hif_usb_stop(void *hif_handle, u8 pipe_id)
 335 {
 336         struct hif_device_usb *hif_dev = (struct hif_device_usb *)hif_handle;
 337         struct tx_buf *tx_buf = NULL, *tx_buf_tmp = NULL;
 338         unsigned long flags;
 339
 340         spin_lock_irqsave(&hif_dev->tx.tx_lock, flags);
 341         ath9k_skb_queue_purge(hif_dev, &hif_dev->tx.tx_skb_queue);
 342         hif_dev->tx.tx_skb_cnt = 0;
 343         hif_dev->tx.flags |= HIF_USB_TX_STOP;
 344         spin_unlock_irqrestore(&hif_dev->tx.tx_lock, flags);
 345
 346         /* The pending URBs have to be canceled. */
 347         list_for_each_entry_safe(tx_buf, tx_buf_tmp,
 348                                  &hif_dev->tx.tx_pending, list) {
 349                 usb_kill_urb(tx_buf->urb);
 350         }
 351 }
 352
 353 static int hif_usb_send(void *hif_handle, u8 pipe_id, struct sk_buff *skb,
 354                         struct ath9k_htc_tx_ctl *tx_ctl)
 355 {
 356         struct hif_device_usb *hif_dev = (struct hif_device_usb *)hif_handle;
 357         int ret = 0;
 358
 359         switch (pipe_id) {
 360         case USB_WLAN_TX_PIPE:
 361                 ret = hif_usb_send_tx(hif_dev, skb, tx_ctl);
 362                 break;
 363         case USB_REG_OUT_PIPE:
 364                 ret = hif_usb_send_regout(hif_dev, skb);
 365                 break;
 366         default:
 367                 dev_err(&hif_dev->udev->dev,
 368                         "ath9k_htc: Invalid TX pipe: %d\n", pipe_id);
 369                 ret = -EINVAL;
 370                 break;
 371         }
 372
 373         return ret;
 374 }
 375
 376 static struct ath9k_htc_hif hif_usb = {
 377         .transport = ATH9K_HIF_USB,
 378         .name = "ath9k_hif_usb",
 379
 380         .control_ul_pipe = USB_REG_OUT_PIPE,
 381         .control_dl_pipe = USB_REG_IN_PIPE,
 382
 383         .start = hif_usb_start,
 384         .stop = hif_usb_stop,
 385         .send = hif_usb_send,
 386 };
 387
 388 static void ath9k_hif_usb_rx_stream(struct hif_device_usb *hif_dev,
 389                                     struct sk_buff *skb)
 390 {
 391         struct sk_buff *nskb, *skb_pool[MAX_PKT_NUM_IN_TRANSFER];
 392         int index = 0, i = 0, len = skb->len;
 393         int rx_remain_len, rx_pkt_len;
 394         u16 pool_index = 0;
 395         u8 *ptr;
 396
 397         spin_lock(&hif_dev->rx_lock);
 398
 399         rx_remain_len = hif_dev->rx_remain_len;
 400         rx_pkt_len = hif_dev->rx_transfer_len;
 401
 402         if (rx_remain_len != 0) {
 403                 struct sk_buff *remain_skb = hif_dev->remain_skb;
 404
 405                 if (remain_skb) {
 406                         ptr = (u8 *) remain_skb->data;
 407
 408                         index = rx_remain_len;
 409                         rx_remain_len -= hif_dev->rx_pad_len;
 410                         ptr += rx_pkt_len;
 411
 412                         memcpy(ptr, skb->data, rx_remain_len);
 413
 414                         rx_pkt_len += rx_remain_len;
 415                         hif_dev->rx_remain_len = 0;
 416                         skb_put(remain_skb, rx_pkt_len);
 417
 418                         skb_pool[pool_index++] = remain_skb;
 419
 420                 } else {
 421                         index = rx_remain_len;
 422                 }
 423         }
 424
 425         spin_unlock(&hif_dev->rx_lock);
 426
 427         while (index < len) {
 428                 u16 pkt_len;
 429                 u16 pkt_tag;
 430                 u16 pad_len;
 431                 int chk_idx;
 432
 433                 ptr = (u8 *) skb->data;
 434
 435                 pkt_len = ptr[index] + (ptr[index+1] << 8);
 436                 pkt_tag = ptr[index+2] + (ptr[index+3] << 8);
 437
 438                 if (pkt_tag != ATH_USB_RX_STREAM_MODE_TAG) {
 439                         RX_STAT_INC(skb_dropped);
 440                         return;
 441                 }
 442
 443                 pad_len = 4 - (pkt_len & 0x3);
 444                 if (pad_len == 4)
 445                         pad_len = 0;
 446
 447                 chk_idx = index;
 448                 index = index + 4 + pkt_len + pad_len;
 449
 450                 if (index > MAX_RX_BUF_SIZE) {
 451                         spin_lock(&hif_dev->rx_lock);
 452                         hif_dev->rx_remain_len = index - MAX_RX_BUF_SIZE;
 453                         hif_dev->rx_transfer_len =
 454                                 MAX_RX_BUF_SIZE - chk_idx - 4;
 455                         hif_dev->rx_pad_len = pad_len;
 456
 457                         nskb = __dev_alloc_skb(pkt_len + 32, GFP_ATOMIC);
 458                         if (!nskb) {
 459                                 dev_err(&hif_dev->udev->dev,
 460                                         "ath9k_htc: RX memory allocation error\n");
 461                                 spin_unlock(&hif_dev->rx_lock);
 462                                 goto err;
 463                         }
 464                         skb_reserve(nskb, 32);
 465                         RX_STAT_INC(skb_allocated);
 466
 467                         memcpy(nskb->data, &(skb->data[chk_idx+4]),
 468                                hif_dev->rx_transfer_len);
 469
 470                         /* Record the buffer pointer */
 471                         hif_dev->remain_skb = nskb;
 472                         spin_unlock(&hif_dev->rx_lock);
 473                 } else {
 474                         nskb = __dev_alloc_skb(pkt_len + 32, GFP_ATOMIC);
 475                         if (!nskb) {
 476                                 dev_err(&hif_dev->udev->dev,
 477                                         "ath9k_htc: RX memory allocation error\n");
 478                                 goto err;
 479                         }
 480                         skb_reserve(nskb, 32);
 481                         RX_STAT_INC(skb_allocated);
 482
 483                         memcpy(nskb->data, &(skb->data[chk_idx+4]), pkt_len);
 484                         skb_put(nskb, pkt_len);
 485                         skb_pool[pool_index++] = nskb;
 486                 }
 487         }
 488
 489 err:
 490         for (i = 0; i < pool_index; i++) {
 491                 ath9k_htc_rx_msg(hif_dev->htc_handle, skb_pool[i],
 492                                  skb_pool[i]->len, USB_WLAN_RX_PIPE);
 493                 RX_STAT_INC(skb_completed);
 494         }
 495 }
 496
 497 static void ath9k_hif_usb_rx_cb(struct urb *urb)
 498 {
 499         struct sk_buff *skb = (struct sk_buff *) urb->context;
 500         struct hif_device_usb *hif_dev =
 501                 usb_get_intfdata(usb_ifnum_to_if(urb->dev, 0));
 502         int ret;
 503
 504         if (!skb)
 505                 return;
 506
 507         if (!hif_dev)
 508                 goto free;
 509
 510         switch (urb->status) {
 511         case 0:
 512                 break;
 513         case -ENOENT:
 514         case -ECONNRESET:
 515         case -ENODEV:
 516         case -ESHUTDOWN:
 517                 goto free;
 518         default:
 519                 goto resubmit;
 520         }
 521
 522         if (likely(urb->actual_length != 0)) {
 523                 skb_put(skb, urb->actual_length);
 524                 ath9k_hif_usb_rx_stream(hif_dev, skb);
 525         }
 526
 527 resubmit:
 528         skb_reset_tail_pointer(skb);
 529         skb_trim(skb, 0);
 530
 531         usb_anchor_urb(urb, &hif_dev->rx_submitted);
 532         ret = usb_submit_urb(urb, GFP_ATOMIC);
 533         if (ret) {
 534                 usb_unanchor_urb(urb);
 535                 goto free;
 536         }
 537
 538         return;
 539 free:
 540         kfree_skb(skb);
 541 }
 542
 543 static void ath9k_hif_usb_reg_in_cb(struct urb *urb)
 544 {
 545         struct sk_buff *skb = (struct sk_buff *) urb->context;
 546         struct sk_buff *nskb;
 547         struct hif_device_usb *hif_dev =
 548                 usb_get_intfdata(usb_ifnum_to_if(urb->dev, 0));
 549         int ret;
 550
 551         if (!skb)
 552                 return;
 553
 554         if (!hif_dev)
 555                 goto free;
 556
 557         switch (urb->status) {
 558         case 0:
 559                 break;
 560         case -ENOENT:
 561         case -ECONNRESET:
 562         case -ENODEV:
 563         case -ESHUTDOWN:
 564                 goto free;
 565         default:
 566                 goto resubmit;
 567         }
 568
 569         if (likely(urb->actual_length != 0)) {
 570                 skb_put(skb, urb->actual_length);
 571
 572                 /* Process the command first */
 573                 ath9k_htc_rx_msg(hif_dev->htc_handle, skb,
 574                                  skb->len, USB_REG_IN_PIPE);
 575
 576
 577                 nskb = alloc_skb(MAX_REG_IN_BUF_SIZE, GFP_ATOMIC);
 578                 if (!nskb) {
 579                         dev_err(&hif_dev->udev->dev,
 580                                 "ath9k_htc: REG_IN memory allocation failure\n");
 581                         urb->context = NULL;
 582                         return;
 583                 }
 584
 585                 usb_fill_bulk_urb(urb, hif_dev->udev,
 586                                  usb_rcvbulkpipe(hif_dev->udev,
 587                                                  USB_REG_IN_PIPE),
 588                                  nskb->data, MAX_REG_IN_BUF_SIZE,
 589                                  ath9k_hif_usb_reg_in_cb, nskb);
 590
 591                 ret = usb_submit_urb(urb, GFP_ATOMIC);
 592                 if (ret) {
 593                         kfree_skb(nskb);
 594                         urb->context = NULL;
 595                 }
 596
 597                 return;
 598         }
 599
 600 resubmit:
 601         skb_reset_tail_pointer(skb);
 602         skb_trim(skb, 0);
 603
 604         ret = usb_submit_urb(urb, GFP_ATOMIC);
 605         if (ret)
 606                 goto free;
 607
 608         return;
 609 free:
 610         kfree_skb(skb);
 611         urb->context = NULL;
 612 }
 613
 614 static void ath9k_hif_usb_dealloc_tx_urbs(struct hif_device_usb *hif_dev)
 615 {
 616         struct tx_buf *tx_buf = NULL, *tx_buf_tmp = NULL;
 617         unsigned long flags;
 618
 619         list_for_each_entry_safe(tx_buf, tx_buf_tmp,
 620                                  &hif_dev->tx.tx_buf, list) {
 621                 usb_kill_urb(tx_buf->urb);
 622                 list_del(&tx_buf->list);
 623                 usb_free_urb(tx_buf->urb);
 624                 kfree(tx_buf->buf);
 625                 kfree(tx_buf);
 626         }
 627
 628         spin_lock_irqsave(&hif_dev->tx.tx_lock, flags);
 629         hif_dev->tx.flags |= HIF_USB_TX_FLUSH;
 630         spin_unlock_irqrestore(&hif_dev->tx.tx_lock, flags);
 631
 632         list_for_each_entry_safe(tx_buf, tx_buf_tmp,
 633                                  &hif_dev->tx.tx_pending, list) {
 634                 usb_kill_urb(tx_buf->urb);
 635                 list_del(&tx_buf->list);
 636                 usb_free_urb(tx_buf->urb);
 637                 kfree(tx_buf->buf);
 638                 kfree(tx_buf);
 639         }
 640 }
 641
 642 static int ath9k_hif_usb_alloc_tx_urbs(struct hif_device_usb *hif_dev)
 643 {
 644         struct tx_buf *tx_buf;
 645         int i;
 646
 647         INIT_LIST_HEAD(&hif_dev->tx.tx_buf);
 648         INIT_LIST_HEAD(&hif_dev->tx.tx_pending);
 649         spin_lock_init(&hif_dev->tx.tx_lock);
 650         __skb_queue_head_init(&hif_dev->tx.tx_skb_queue);
 651
 652         for (i = 0; i < MAX_TX_URB_NUM; i++) {
 653                 tx_buf = kzalloc(sizeof(struct tx_buf), GFP_KERNEL);
 654                 if (!tx_buf)
 655                         goto err;
 656
 657                 tx_buf->buf = kzalloc(MAX_TX_BUF_SIZE, GFP_KERNEL);
 658                 if (!tx_buf->buf)
 659                         goto err;
 660
 661                 tx_buf->urb = usb_alloc_urb(0, GFP_KERNEL);
 662                 if (!tx_buf->urb)
 663                         goto err;
 664
 665                 tx_buf->hif_dev = hif_dev;
 666                 __skb_queue_head_init(&tx_buf->skb_queue);
 667
 668                 list_add_tail(&tx_buf->list, &hif_dev->tx.tx_buf);
 669         }
 670
 671         hif_dev->tx.tx_buf_cnt = MAX_TX_URB_NUM;
 672
 673         return 0;
 674 err:
 675         if (tx_buf) {
 676                 kfree(tx_buf->buf);
 677                 kfree(tx_buf);
 678         }
 679         ath9k_hif_usb_dealloc_tx_urbs(hif_dev);
 680         return -ENOMEM;
 681 }
 682
 683 static void ath9k_hif_usb_dealloc_rx_urbs(struct hif_device_usb *hif_dev)
 684 {
 685         usb_kill_anchored_urbs(&hif_dev->rx_submitted);
 686 }
 687
 688 static int ath9k_hif_usb_alloc_rx_urbs(struct hif_device_usb *hif_dev)
 689 {
 690         struct urb *urb = NULL;
 691         struct sk_buff *skb = NULL;
 692         int i, ret;
 693
 694         init_usb_anchor(&hif_dev->rx_submitted);
 695         spin_lock_init(&hif_dev->rx_lock);
 696
 697         for (i = 0; i < MAX_RX_URB_NUM; i++) {
 698
 699                 /* Allocate URB */
 700                 urb = usb_alloc_urb(0, GFP_KERNEL);
 701                 if (urb == NULL) {
 702                         ret = -ENOMEM;
 703                         goto err_urb;
 704                 }
 705
 706                 /* Allocate buffer */
 707                 skb = alloc_skb(MAX_RX_BUF_SIZE, GFP_KERNEL);
 708                 if (!skb) {
 709                         ret = -ENOMEM;
 710                         goto err_skb;
 711                 }
 712
 713                 usb_fill_bulk_urb(urb, hif_dev->udev,
 714                                   usb_rcvbulkpipe(hif_dev->udev,
 715                                                   USB_WLAN_RX_PIPE),
 716                                   skb->data, MAX_RX_BUF_SIZE,
 717                                   ath9k_hif_usb_rx_cb, skb);
 718
 719                 /* Anchor URB */
 720                 usb_anchor_urb(urb, &hif_dev->rx_submitted);
 721
 722                 /* Submit URB */
 723                 ret = usb_submit_urb(urb, GFP_KERNEL);
 724                 if (ret) {
 725                         usb_unanchor_urb(urb);
 726                         goto err_submit;
 727                 }
 728
 729                 /*
 730                  * Drop reference count.
 731                  * This ensures that the URB is freed when killing them.
 732                  */
 733                 usb_free_urb(urb);
 734         }
 735
 736         return 0;
 737
 738 err_submit:
 739         kfree_skb(skb);
 740 err_skb:
 741         usb_free_urb(urb);
 742 err_urb:
 743         ath9k_hif_usb_dealloc_rx_urbs(hif_dev);
 744         return ret;
 745 }
 746
 747 static void ath9k_hif_usb_dealloc_reg_in_urb(struct hif_device_usb *hif_dev)
 748 {
 749         if (hif_dev->reg_in_urb) {
 750                 usb_kill_urb(hif_dev->reg_in_urb);
 751                 if (hif_dev->reg_in_urb->context)
 752                         kfree_skb((void *)hif_dev->reg_in_urb->context);
 753                 usb_free_urb(hif_dev->reg_in_urb);
 754                 hif_dev->reg_in_urb = NULL;
 755         }
 756 }
 757
 758 static int ath9k_hif_usb_alloc_reg_in_urb(struct hif_device_usb *hif_dev)
 759 {
 760         struct sk_buff *skb;
 761
 762         hif_dev->reg_in_urb = usb_alloc_urb(0, GFP_KERNEL);
 763         if (hif_dev->reg_in_urb == NULL)
 764                 return -ENOMEM;
 765
 766         skb = alloc_skb(MAX_REG_IN_BUF_SIZE, GFP_KERNEL);
 767         if (!skb)
 768                 goto err;
 769
 770         usb_fill_bulk_urb(hif_dev->reg_in_urb, hif_dev->udev,
 771                          usb_rcvbulkpipe(hif_dev->udev,
 772                                          USB_REG_IN_PIPE),
 773                          skb->data, MAX_REG_IN_BUF_SIZE,
 774                          ath9k_hif_usb_reg_in_cb, skb);
 775
 776         if (usb_submit_urb(hif_dev->reg_in_urb, GFP_KERNEL) != 0)
 777                 goto err;
 778
 779         return 0;
 780
 781 err:
 782         ath9k_hif_usb_dealloc_reg_in_urb(hif_dev);
 783         return -ENOMEM;
 784 }
 785
 786 static int ath9k_hif_usb_alloc_urbs(struct hif_device_usb *hif_dev)
 787 {
 788         /* Register Write */
 789         init_usb_anchor(&hif_dev->regout_submitted);
 790
 791         /* TX */
 792         if (ath9k_hif_usb_alloc_tx_urbs(hif_dev) < 0)
 793                 goto err;
 794
 795         /* RX */
 796         if (ath9k_hif_usb_alloc_rx_urbs(hif_dev) < 0)
 797                 goto err_rx;
 798
 799         /* Register Read */
 800         if (ath9k_hif_usb_alloc_reg_in_urb(hif_dev) < 0)
 801                 goto err_reg;
 802
 803         return 0;
 804 err_reg:
 805         ath9k_hif_usb_dealloc_rx_urbs(hif_dev);
 806 err_rx:
 807         ath9k_hif_usb_dealloc_tx_urbs(hif_dev);
 808 err:
 809         return -ENOMEM;
 810 }
 811
 812 static void ath9k_hif_usb_dealloc_urbs(struct hif_device_usb *hif_dev)
 813 {
 814         usb_kill_anchored_urbs(&hif_dev->regout_submitted);
 815         ath9k_hif_usb_dealloc_reg_in_urb(hif_dev);
 816         ath9k_hif_usb_dealloc_tx_urbs(hif_dev);
 817         ath9k_hif_usb_dealloc_rx_urbs(hif_dev);
 818 }
 819
 820 static int ath9k_hif_usb_download_fw(struct hif_device_usb *hif_dev,
 821                                      u32 drv_info)
 822 {
 823         int transfer, err;
 824         const void *data = hif_dev->firmware->data;
 825         size_t len = hif_dev->firmware->size;
 826         u32 addr = AR9271_FIRMWARE;
 827         u8 *buf = kzalloc(4096, GFP_KERNEL);
 828         u32 firm_offset;
 829
 830         if (!buf)
 831                 return -ENOMEM;
 832
 833         while (len) {
 834                 transfer = min_t(int, len, 4096);
 835                 memcpy(buf, data, transfer);
 836
 837                 err = usb_control_msg(hif_dev->udev,
 838                                       usb_sndctrlpipe(hif_dev->udev, 0),
 839                                       FIRMWARE_DOWNLOAD, 0x40 | USB_DIR_OUT,
 840                                       addr >> 8, 0, buf, transfer, HZ);
 841                 if (err < 0) {
 842                         kfree(buf);
 843                         return err;
 844                 }
 845
 846                 len -= transfer;
 847                 data += transfer;
 848                 addr += transfer;
 849         }
 850         kfree(buf);
 851
 852         if (IS_AR7010_DEVICE(drv_info))
 853                 firm_offset = AR7010_FIRMWARE_TEXT;
 854         else
 855                 firm_offset = AR9271_FIRMWARE_TEXT;
 856
 857         /*
 858          * Issue FW download complete command to firmware.
 859          */
 860         err = usb_control_msg(hif_dev->udev, usb_sndctrlpipe(hif_dev->udev, 0),
 861                               FIRMWARE_DOWNLOAD_COMP,
 862                               0x40 | USB_DIR_OUT,
 863                               firm_offset >> 8, 0, NULL, 0, HZ);
 864         if (err)
 865                 return -EIO;
 866
 867         dev_info(&hif_dev->udev->dev, "ath9k_htc: Transferred FW: %s, size: %ld\n",
 868                  hif_dev->fw_name, (unsigned long) hif_dev->firmware->size);
 869
 870         return 0;
 871 }
 872
 873 static int ath9k_hif_usb_dev_init(struct hif_device_usb *hif_dev, u32 drv_info)
 874 {
 875         int ret, idx;
 876         struct usb_host_interface *alt = &hif_dev->interface->altsetting[0];
 877         struct usb_endpoint_descriptor *endp;
 878
 879         /* Request firmware */
 880         ret = request_firmware(&hif_dev->firmware, hif_dev->fw_name,
 881                                &hif_dev->udev->dev);
 882         if (ret) {
 883                 dev_err(&hif_dev->udev->dev,
 884                         "ath9k_htc: Firmware - %s not found\n", hif_dev->fw_name);
 885                 goto err_fw_req;
 886         }
 887
 888         /* Download firmware */
 889         ret = ath9k_hif_usb_download_fw(hif_dev, drv_info);
 890         if (ret) {
 891                 dev_err(&hif_dev->udev->dev,
 892                         "ath9k_htc: Firmware - %s download failed\n",
 893                         hif_dev->fw_name);
 894                 goto err_fw_download;
 895         }
 896
 897         /* On downloading the firmware to the target, the USB descriptor of EP4
 898          * is 'patched' to change the type of the endpoint to Bulk. This will
 899          * bring down CPU usage during the scan period.
 900          */
 901         for (idx = 0; idx < alt->desc.bNumEndpoints; idx++) {
 902                 endp = &alt->endpoint[idx].desc;
 903                 if ((endp->bmAttributes & USB_ENDPOINT_XFERTYPE_MASK)
 904                                 == USB_ENDPOINT_XFER_INT) {
 905                         endp->bmAttributes &= ~USB_ENDPOINT_XFERTYPE_MASK;
 906                         endp->bmAttributes |= USB_ENDPOINT_XFER_BULK;
 907                         endp->bInterval = 0;
 908                 }
 909         }
 910
 911         /* Alloc URBs */
 912         ret = ath9k_hif_usb_alloc_urbs(hif_dev);
 913         if (ret) {
 914                 dev_err(&hif_dev->udev->dev,
 915                         "ath9k_htc: Unable to allocate URBs\n");
 916                 goto err_urb;
 917         }
 918
 919         return 0;
 920
 921 err_urb:
 922         ath9k_hif_usb_dealloc_urbs(hif_dev);
 923 err_fw_download:
 924         release_firmware(hif_dev->firmware);
 925 err_fw_req:
 926         hif_dev->firmware = NULL;
 927         return ret;
 928 }
 929
 930 static void ath9k_hif_usb_dev_deinit(struct hif_device_usb *hif_dev)
 931 {
 932         ath9k_hif_usb_dealloc_urbs(hif_dev);
 933         if (hif_dev->firmware)
 934                 release_firmware(hif_dev->firmware);
 935 }
 936
 937 static int ath9k_hif_usb_probe(struct usb_interface *interface,
 938                                const struct usb_device_id *id)
 939 {
 940         struct usb_device *udev = interface_to_usbdev(interface);
 941         struct hif_device_usb *hif_dev;
 942         int ret = 0;
 943
 944         hif_dev = kzalloc(sizeof(struct hif_device_usb), GFP_KERNEL);
 945         if (!hif_dev) {
 946                 ret = -ENOMEM;
 947                 goto err_alloc;
 948         }
 949
 950         usb_get_dev(udev);
 951         hif_dev->udev = udev;
 952         hif_dev->interface = interface;
 953         hif_dev->device_id = id->idProduct;
 954 #ifdef CONFIG_PM
 955         udev->reset_resume = 1;
 956 #endif
 957         usb_set_intfdata(interface, hif_dev);
 958
 959         hif_dev->htc_handle = ath9k_htc_hw_alloc(hif_dev, &hif_usb,
 960                                                  &hif_dev->udev->dev);
 961         if (hif_dev->htc_handle == NULL) {
 962                 ret = -ENOMEM;
 963                 goto err_htc_hw_alloc;
 964         }
 965
 966         /* Find out which firmware to load */
 967
 968         if (IS_AR7010_DEVICE(id->driver_info))
 969                 if (le16_to_cpu(udev->descriptor.bcdDevice) == 0x0202)
 970                         hif_dev->fw_name = FIRMWARE_AR7010_1_1;
 971                 else
 972                         hif_dev->fw_name = FIRMWARE_AR7010;
 973         else
 974                 hif_dev->fw_name = FIRMWARE_AR9271;
 975
 976         ret = ath9k_hif_usb_dev_init(hif_dev, id->driver_info);
 977         if (ret) {
 978                 ret = -EINVAL;
 979                 goto err_hif_init_usb;
 980         }
 981
 982         ret = ath9k_htc_hw_init(hif_dev->htc_handle,
 983                                 &hif_dev->udev->dev, hif_dev->device_id,
 984                                 hif_dev->udev->product, id->driver_info);
 985         if (ret) {
 986                 ret = -EINVAL;
 987                 goto err_htc_hw_init;
 988         }
 989
 990         dev_info(&hif_dev->udev->dev, "ath9k_htc: USB layer initialized\n");
 991
 992         return 0;
 993
 994 err_htc_hw_init:
 995         ath9k_hif_usb_dev_deinit(hif_dev);
 996 err_hif_init_usb:
 997         ath9k_htc_hw_free(hif_dev->htc_handle);
 998 err_htc_hw_alloc:
 999         usb_set_intfdata(interface, NULL);
1000         kfree(hif_dev);
1001         usb_put_dev(udev);
1002 err_alloc:
1003         return ret;
1004 }
1005
1006 static void ath9k_hif_usb_reboot(struct usb_device *udev)
1007 {
1008         u32 reboot_cmd = 0xffffffff;
1009         void *buf;
1010         int ret;
1011
1012         buf = kmemdup(&reboot_cmd, 4, GFP_KERNEL);
1013         if (!buf)
1014                 return;
1015
1016         ret = usb_bulk_msg(udev, usb_sndbulkpipe(udev, USB_REG_OUT_PIPE),
1017                            buf, 4, NULL, HZ);
1018         if (ret)
1019                 dev_err(&udev->dev, "ath9k_htc: USB reboot failed\n");
1020
1021         kfree(buf);
1022 }
1023
1024 static void ath9k_hif_usb_disconnect(struct usb_interface *interface)
1025 {
1026         struct usb_device *udev = interface_to_usbdev(interface);
1027         struct hif_device_usb *hif_dev = usb_get_intfdata(interface);
1028         bool unplugged = (udev->state == USB_STATE_NOTATTACHED) ? true : false;
1029
1030         if (hif_dev) {
1031                 ath9k_htc_hw_deinit(hif_dev->htc_handle, unplugged);
1032                 ath9k_htc_hw_free(hif_dev->htc_handle);
1033                 ath9k_hif_usb_dev_deinit(hif_dev);
1034                 usb_set_intfdata(interface, NULL);
1035         }
1036
1037         if (!unplugged && (hif_dev->flags & HIF_USB_START))
1038                 ath9k_hif_usb_reboot(udev);
1039
1040         kfree(hif_dev);
1041         dev_info(&udev->dev, "ath9k_htc: USB layer deinitialized\n");
1042         usb_put_dev(udev);
1043 }
1044
1045 #ifdef CONFIG_PM
1046 static int ath9k_hif_usb_suspend(struct usb_interface *interface,
1047                                  pm_message_t message)
1048 {
1049         struct hif_device_usb *hif_dev = usb_get_intfdata(interface);
1050
1051         /*
1052          * The device has to be set to FULLSLEEP mode in case no
1053          * interface is up.
1054          */
1055         if (!(hif_dev->flags & HIF_USB_START))
1056                 ath9k_htc_suspend(hif_dev->htc_handle);
1057
1058         ath9k_hif_usb_dealloc_urbs(hif_dev);
1059
1060         return 0;
1061 }
1062
1063 static int ath9k_hif_usb_resume(struct usb_interface *interface)
1064 {
1065         struct hif_device_usb *hif_dev = usb_get_intfdata(interface);
1066         struct htc_target *htc_handle = hif_dev->htc_handle;
1067         int ret;
1068
1069         ret = ath9k_hif_usb_alloc_urbs(hif_dev);
1070         if (ret)
1071                 return ret;
1072
1073         if (hif_dev->firmware) {
1074                 ret = ath9k_hif_usb_download_fw(hif_dev,
1075                                 htc_handle->drv_priv->ah->hw_version.usbdev);
1076                 if (ret)
1077                         goto fail_resume;
1078         } else {
1079                 ath9k_hif_usb_dealloc_urbs(hif_dev);
1080                 return -EIO;
1081         }
1082
1083         mdelay(100);
1084
1085         ret = ath9k_htc_resume(htc_handle);
1086
1087         if (ret)
1088                 goto fail_resume;
1089
1090         return 0;
1091
1092 fail_resume:
1093         ath9k_hif_usb_dealloc_urbs(hif_dev);
1094
1095         return ret;
1096 }
1097 #endif
1098
1099 static struct usb_driver ath9k_hif_usb_driver = {
1100         .name = "ath9k_hif_usb",
1101         .probe = ath9k_hif_usb_probe,
1102         .disconnect = ath9k_hif_usb_disconnect,
1103 #ifdef CONFIG_PM
1104         .suspend = ath9k_hif_usb_suspend,
1105         .resume = ath9k_hif_usb_resume,
1106         .reset_resume = ath9k_hif_usb_resume,
1107 #endif
1108         .id_table = ath9k_hif_usb_ids,
1109         .soft_unbind = 1,
1110 };
1111
1112 int ath9k_hif_usb_init(void)
1113 {
1114         return usb_register(&ath9k_hif_usb_driver);
1115 }
1116
1117 void ath9k_hif_usb_exit(void)
1118 {
1119         usb_deregister(&ath9k_hif_usb_driver);
1120 }