Pileus Git - ~andy/linux/blob - 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                  * and return.
 158                  */
 159                 ath9k_skb_queue_purge(hif_dev, &tx_buf->skb_queue);
 160                 return;
 161         default:
 162                 break;
 163         }
 164
 165         /* Check if TX has been stopped */
 166         spin_lock(&hif_dev->tx.tx_lock);
 167         if (hif_dev->tx.flags & HIF_USB_TX_STOP) {
 168                 spin_unlock(&hif_dev->tx.tx_lock);
 169                 ath9k_skb_queue_purge(hif_dev, &tx_buf->skb_queue);
 170                 goto add_free;
 171         }
 172         spin_unlock(&hif_dev->tx.tx_lock);
 173
 174         /* Complete the queued SKBs. */
 175         while ((skb = __skb_dequeue(&tx_buf->skb_queue)) != NULL) {
 176                 ath9k_htc_txcompletion_cb(hif_dev->htc_handle,
 177                                           skb, 1);
 178                 TX_STAT_INC(skb_completed);
 179         }
 180
 181 add_free:
 182         /* Re-initialize the SKB queue */
 183         tx_buf->len = tx_buf->offset = 0;
 184         __skb_queue_head_init(&tx_buf->skb_queue);
 185
 186         /* Add this TX buffer to the free list */
 187         spin_lock(&hif_dev->tx.tx_lock);
 188         list_move_tail(&tx_buf->list, &hif_dev->tx.tx_buf);
 189         hif_dev->tx.tx_buf_cnt++;
 190         if (!(hif_dev->tx.flags & HIF_USB_TX_STOP))
 191                 __hif_usb_tx(hif_dev); /* Check for pending SKBs */
 192         TX_STAT_INC(buf_completed);
 193         spin_unlock(&hif_dev->tx.tx_lock);
 194 }
 195
 196 /* TX lock has to be taken */
 197 static int __hif_usb_tx(struct hif_device_usb *hif_dev)
 198 {
 199         struct tx_buf *tx_buf = NULL;
 200         struct sk_buff *nskb = NULL;
 201         int ret = 0, i;
 202         u16 *hdr, tx_skb_cnt = 0;
 203         u8 *buf;
 204
 205         if (hif_dev->tx.tx_skb_cnt == 0)
 206                 return 0;
 207
 208         /* Check if a free TX buffer is available */
 209         if (list_empty(&hif_dev->tx.tx_buf))
 210                 return 0;
 211
 212         tx_buf = list_first_entry(&hif_dev->tx.tx_buf, struct tx_buf, list);
 213         list_move_tail(&tx_buf->list, &hif_dev->tx.tx_pending);
 214         hif_dev->tx.tx_buf_cnt--;
 215
 216         tx_skb_cnt = min_t(u16, hif_dev->tx.tx_skb_cnt, MAX_TX_AGGR_NUM);
 217
 218         for (i = 0; i < tx_skb_cnt; i++) {
 219                 nskb = __skb_dequeue(&hif_dev->tx.tx_skb_queue);
 220
 221                 /* Should never be NULL */
 222                 BUG_ON(!nskb);
 223
 224                 hif_dev->tx.tx_skb_cnt--;
 225
 226                 buf = tx_buf->buf;
 227                 buf += tx_buf->offset;
 228                 hdr = (u16 *)buf;
 229                 *hdr++ = nskb->len;
 230                 *hdr++ = ATH_USB_TX_STREAM_MODE_TAG;
 231                 buf += 4;
 232                 memcpy(buf, nskb->data, nskb->len);
 233                 tx_buf->len = nskb->len + 4;
 234
 235                 if (i < (tx_skb_cnt - 1))
 236                         tx_buf->offset += (((tx_buf->len - 1) / 4) + 1) * 4;
 237
 238                 if (i == (tx_skb_cnt - 1))
 239                         tx_buf->len += tx_buf->offset;
 240
 241                 __skb_queue_tail(&tx_buf->skb_queue, nskb);
 242                 TX_STAT_INC(skb_queued);
 243         }
 244
 245         usb_fill_bulk_urb(tx_buf->urb, hif_dev->udev,
 246                           usb_sndbulkpipe(hif_dev->udev, USB_WLAN_TX_PIPE),
 247                           tx_buf->buf, tx_buf->len,
 248                           hif_usb_tx_cb, tx_buf);
 249
 250         ret = usb_submit_urb(tx_buf->urb, GFP_ATOMIC);
 251         if (ret) {
 252                 tx_buf->len = tx_buf->offset = 0;
 253                 ath9k_skb_queue_purge(hif_dev, &tx_buf->skb_queue);
 254                 __skb_queue_head_init(&tx_buf->skb_queue);
 255                 list_move_tail(&tx_buf->list, &hif_dev->tx.tx_buf);
 256                 hif_dev->tx.tx_buf_cnt++;
 257         }
 258
 259         if (!ret)
 260                 TX_STAT_INC(buf_queued);
 261
 262         return ret;
 263 }
 264
 265 static int hif_usb_send_tx(struct hif_device_usb *hif_dev, struct sk_buff *skb,
 266                            struct ath9k_htc_tx_ctl *tx_ctl)
 267 {
 268         unsigned long flags;
 269
 270         spin_lock_irqsave(&hif_dev->tx.tx_lock, flags);
 271
 272         if (hif_dev->tx.flags & HIF_USB_TX_STOP) {
 273                 spin_unlock_irqrestore(&hif_dev->tx.tx_lock, flags);
 274                 return -ENODEV;
 275         }
 276
 277         /* Check if the max queue count has been reached */
 278         if (hif_dev->tx.tx_skb_cnt > MAX_TX_BUF_NUM) {
 279                 spin_unlock_irqrestore(&hif_dev->tx.tx_lock, flags);
 280                 return -ENOMEM;
 281         }
 282
 283         __skb_queue_tail(&hif_dev->tx.tx_skb_queue, skb);
 284         hif_dev->tx.tx_skb_cnt++;
 285
 286         /* Send normal frames immediately */
 287         if (!tx_ctl || (tx_ctl && (tx_ctl->type == ATH9K_HTC_NORMAL)))
 288                 __hif_usb_tx(hif_dev);
 289
 290         /* Check if AMPDUs have to be sent immediately */
 291         if (tx_ctl && (tx_ctl->type == ATH9K_HTC_AMPDU) &&
 292             (hif_dev->tx.tx_buf_cnt == MAX_TX_URB_NUM) &&
 293             (hif_dev->tx.tx_skb_cnt < 2)) {
 294                 __hif_usb_tx(hif_dev);
 295         }
 296
 297         spin_unlock_irqrestore(&hif_dev->tx.tx_lock, flags);
 298
 299         return 0;
 300 }
 301
 302 static void hif_usb_start(void *hif_handle, u8 pipe_id)
 303 {
 304         struct hif_device_usb *hif_dev = (struct hif_device_usb *)hif_handle;
 305         unsigned long flags;
 306
 307         hif_dev->flags |= HIF_USB_START;
 308
 309         spin_lock_irqsave(&hif_dev->tx.tx_lock, flags);
 310         hif_dev->tx.flags &= ~HIF_USB_TX_STOP;
 311         spin_unlock_irqrestore(&hif_dev->tx.tx_lock, flags);
 312 }
 313
 314 static void hif_usb_stop(void *hif_handle, u8 pipe_id)
 315 {
 316         struct hif_device_usb *hif_dev = (struct hif_device_usb *)hif_handle;
 317         unsigned long flags;
 318
 319         spin_lock_irqsave(&hif_dev->tx.tx_lock, flags);
 320         ath9k_skb_queue_purge(hif_dev, &hif_dev->tx.tx_skb_queue);
 321         hif_dev->tx.tx_skb_cnt = 0;
 322         hif_dev->tx.flags |= HIF_USB_TX_STOP;
 323         spin_unlock_irqrestore(&hif_dev->tx.tx_lock, flags);
 324 }
 325
 326 static int hif_usb_send(void *hif_handle, u8 pipe_id, struct sk_buff *skb,
 327                         struct ath9k_htc_tx_ctl *tx_ctl)
 328 {
 329         struct hif_device_usb *hif_dev = (struct hif_device_usb *)hif_handle;
 330         int ret = 0;
 331
 332         switch (pipe_id) {
 333         case USB_WLAN_TX_PIPE:
 334                 ret = hif_usb_send_tx(hif_dev, skb, tx_ctl);
 335                 break;
 336         case USB_REG_OUT_PIPE:
 337                 ret = hif_usb_send_regout(hif_dev, skb);
 338                 break;
 339         default:
 340                 dev_err(&hif_dev->udev->dev,
 341                         "ath9k_htc: Invalid TX pipe: %d\n", pipe_id);
 342                 ret = -EINVAL;
 343                 break;
 344         }
 345
 346         return ret;
 347 }
 348
 349 static struct ath9k_htc_hif hif_usb = {
 350         .transport = ATH9K_HIF_USB,
 351         .name = "ath9k_hif_usb",
 352
 353         .control_ul_pipe = USB_REG_OUT_PIPE,
 354         .control_dl_pipe = USB_REG_IN_PIPE,
 355
 356         .start = hif_usb_start,
 357         .stop = hif_usb_stop,
 358         .send = hif_usb_send,
 359 };
 360
 361 static void ath9k_hif_usb_rx_stream(struct hif_device_usb *hif_dev,
 362                                     struct sk_buff *skb)
 363 {
 364         struct sk_buff *nskb, *skb_pool[MAX_PKT_NUM_IN_TRANSFER];
 365         int index = 0, i = 0, len = skb->len;
 366         int rx_remain_len, rx_pkt_len;
 367         u16 pool_index = 0;
 368         u8 *ptr;
 369
 370         spin_lock(&hif_dev->rx_lock);
 371
 372         rx_remain_len = hif_dev->rx_remain_len;
 373         rx_pkt_len = hif_dev->rx_transfer_len;
 374
 375         if (rx_remain_len != 0) {
 376                 struct sk_buff *remain_skb = hif_dev->remain_skb;
 377
 378                 if (remain_skb) {
 379                         ptr = (u8 *) remain_skb->data;
 380
 381                         index = rx_remain_len;
 382                         rx_remain_len -= hif_dev->rx_pad_len;
 383                         ptr += rx_pkt_len;
 384
 385                         memcpy(ptr, skb->data, rx_remain_len);
 386
 387                         rx_pkt_len += rx_remain_len;
 388                         hif_dev->rx_remain_len = 0;
 389                         skb_put(remain_skb, rx_pkt_len);
 390
 391                         skb_pool[pool_index++] = remain_skb;
 392
 393                 } else {
 394                         index = rx_remain_len;
 395                 }
 396         }
 397
 398         spin_unlock(&hif_dev->rx_lock);
 399
 400         while (index < len) {
 401                 u16 pkt_len;
 402                 u16 pkt_tag;
 403                 u16 pad_len;
 404                 int chk_idx;
 405
 406                 ptr = (u8 *) skb->data;
 407
 408                 pkt_len = ptr[index] + (ptr[index+1] << 8);
 409                 pkt_tag = ptr[index+2] + (ptr[index+3] << 8);
 410
 411                 if (pkt_tag != ATH_USB_RX_STREAM_MODE_TAG) {
 412                         RX_STAT_INC(skb_dropped);
 413                         return;
 414                 }
 415
 416                 pad_len = 4 - (pkt_len & 0x3);
 417                 if (pad_len == 4)
 418                         pad_len = 0;
 419
 420                 chk_idx = index;
 421                 index = index + 4 + pkt_len + pad_len;
 422
 423                 if (index > MAX_RX_BUF_SIZE) {
 424                         spin_lock(&hif_dev->rx_lock);
 425                         hif_dev->rx_remain_len = index - MAX_RX_BUF_SIZE;
 426                         hif_dev->rx_transfer_len =
 427                                 MAX_RX_BUF_SIZE - chk_idx - 4;
 428                         hif_dev->rx_pad_len = pad_len;
 429
 430                         nskb = __dev_alloc_skb(pkt_len + 32, GFP_ATOMIC);
 431                         if (!nskb) {
 432                                 dev_err(&hif_dev->udev->dev,
 433                                         "ath9k_htc: RX memory allocation error\n");
 434                                 spin_unlock(&hif_dev->rx_lock);
 435                                 goto err;
 436                         }
 437                         skb_reserve(nskb, 32);
 438                         RX_STAT_INC(skb_allocated);
 439
 440                         memcpy(nskb->data, &(skb->data[chk_idx+4]),
 441                                hif_dev->rx_transfer_len);
 442
 443                         /* Record the buffer pointer */
 444                         hif_dev->remain_skb = nskb;
 445                         spin_unlock(&hif_dev->rx_lock);
 446                 } else {
 447                         nskb = __dev_alloc_skb(pkt_len + 32, GFP_ATOMIC);
 448                         if (!nskb) {
 449                                 dev_err(&hif_dev->udev->dev,
 450                                         "ath9k_htc: RX memory allocation error\n");
 451                                 goto err;
 452                         }
 453                         skb_reserve(nskb, 32);
 454                         RX_STAT_INC(skb_allocated);
 455
 456                         memcpy(nskb->data, &(skb->data[chk_idx+4]), pkt_len);
 457                         skb_put(nskb, pkt_len);
 458                         skb_pool[pool_index++] = nskb;
 459                 }
 460         }
 461
 462 err:
 463         for (i = 0; i < pool_index; i++) {
 464                 ath9k_htc_rx_msg(hif_dev->htc_handle, skb_pool[i],
 465                                  skb_pool[i]->len, USB_WLAN_RX_PIPE);
 466                 RX_STAT_INC(skb_completed);
 467         }
 468 }
 469
 470 static void ath9k_hif_usb_rx_cb(struct urb *urb)
 471 {
 472         struct sk_buff *skb = (struct sk_buff *) urb->context;
 473         struct hif_device_usb *hif_dev =
 474                 usb_get_intfdata(usb_ifnum_to_if(urb->dev, 0));
 475         int ret;
 476
 477         if (!skb)
 478                 return;
 479
 480         if (!hif_dev)
 481                 goto free;
 482
 483         switch (urb->status) {
 484         case 0:
 485                 break;
 486         case -ENOENT:
 487         case -ECONNRESET:
 488         case -ENODEV:
 489         case -ESHUTDOWN:
 490                 goto free;
 491         default:
 492                 goto resubmit;
 493         }
 494
 495         if (likely(urb->actual_length != 0)) {
 496                 skb_put(skb, urb->actual_length);
 497                 ath9k_hif_usb_rx_stream(hif_dev, skb);
 498         }
 499
 500 resubmit:
 501         skb_reset_tail_pointer(skb);
 502         skb_trim(skb, 0);
 503
 504         usb_anchor_urb(urb, &hif_dev->rx_submitted);
 505         ret = usb_submit_urb(urb, GFP_ATOMIC);
 506         if (ret) {
 507                 usb_unanchor_urb(urb);
 508                 goto free;
 509         }
 510
 511         return;
 512 free:
 513         kfree_skb(skb);
 514 }
 515
 516 static void ath9k_hif_usb_reg_in_cb(struct urb *urb)
 517 {
 518         struct sk_buff *skb = (struct sk_buff *) urb->context;
 519         struct sk_buff *nskb;
 520         struct hif_device_usb *hif_dev =
 521                 usb_get_intfdata(usb_ifnum_to_if(urb->dev, 0));
 522         int ret;
 523
 524         if (!skb)
 525                 return;
 526
 527         if (!hif_dev)
 528                 goto free;
 529
 530         switch (urb->status) {
 531         case 0:
 532                 break;
 533         case -ENOENT:
 534         case -ECONNRESET:
 535         case -ENODEV:
 536         case -ESHUTDOWN:
 537                 goto free;
 538         default:
 539                 goto resubmit;
 540         }
 541
 542         if (likely(urb->actual_length != 0)) {
 543                 skb_put(skb, urb->actual_length);
 544
 545                 /* Process the command first */
 546                 ath9k_htc_rx_msg(hif_dev->htc_handle, skb,
 547                                  skb->len, USB_REG_IN_PIPE);
 548
 549
 550                 nskb = alloc_skb(MAX_REG_IN_BUF_SIZE, GFP_ATOMIC);
 551                 if (!nskb) {
 552                         dev_err(&hif_dev->udev->dev,
 553                                 "ath9k_htc: REG_IN memory allocation failure\n");
 554                         urb->context = NULL;
 555                         return;
 556                 }
 557
 558                 usb_fill_bulk_urb(urb, hif_dev->udev,
 559                                  usb_rcvbulkpipe(hif_dev->udev,
 560                                                  USB_REG_IN_PIPE),
 561                                  nskb->data, MAX_REG_IN_BUF_SIZE,
 562                                  ath9k_hif_usb_reg_in_cb, nskb);
 563
 564                 ret = usb_submit_urb(urb, GFP_ATOMIC);
 565                 if (ret) {
 566                         kfree_skb(nskb);
 567                         urb->context = NULL;
 568                 }
 569
 570                 return;
 571         }
 572
 573 resubmit:
 574         skb_reset_tail_pointer(skb);
 575         skb_trim(skb, 0);
 576
 577         ret = usb_submit_urb(urb, GFP_ATOMIC);
 578         if (ret)
 579                 goto free;
 580
 581         return;
 582 free:
 583         kfree_skb(skb);
 584         urb->context = NULL;
 585 }
 586
 587 static void ath9k_hif_usb_dealloc_tx_urbs(struct hif_device_usb *hif_dev)
 588 {
 589         struct tx_buf *tx_buf = NULL, *tx_buf_tmp = NULL;
 590
 591         list_for_each_entry_safe(tx_buf, tx_buf_tmp,
 592                                  &hif_dev->tx.tx_buf, list) {
 593                 usb_kill_urb(tx_buf->urb);
 594                 list_del(&tx_buf->list);
 595                 usb_free_urb(tx_buf->urb);
 596                 kfree(tx_buf->buf);
 597                 kfree(tx_buf);
 598         }
 599
 600         list_for_each_entry_safe(tx_buf, tx_buf_tmp,
 601                                  &hif_dev->tx.tx_pending, list) {
 602                 usb_kill_urb(tx_buf->urb);
 603                 list_del(&tx_buf->list);
 604                 usb_free_urb(tx_buf->urb);
 605                 kfree(tx_buf->buf);
 606                 kfree(tx_buf);
 607         }
 608 }
 609
 610 static int ath9k_hif_usb_alloc_tx_urbs(struct hif_device_usb *hif_dev)
 611 {
 612         struct tx_buf *tx_buf;
 613         int i;
 614
 615         INIT_LIST_HEAD(&hif_dev->tx.tx_buf);
 616         INIT_LIST_HEAD(&hif_dev->tx.tx_pending);
 617         spin_lock_init(&hif_dev->tx.tx_lock);
 618         __skb_queue_head_init(&hif_dev->tx.tx_skb_queue);
 619
 620         for (i = 0; i < MAX_TX_URB_NUM; i++) {
 621                 tx_buf = kzalloc(sizeof(struct tx_buf), GFP_KERNEL);
 622                 if (!tx_buf)
 623                         goto err;
 624
 625                 tx_buf->buf = kzalloc(MAX_TX_BUF_SIZE, GFP_KERNEL);
 626                 if (!tx_buf->buf)
 627                         goto err;
 628
 629                 tx_buf->urb = usb_alloc_urb(0, GFP_KERNEL);
 630                 if (!tx_buf->urb)
 631                         goto err;
 632
 633                 tx_buf->hif_dev = hif_dev;
 634                 __skb_queue_head_init(&tx_buf->skb_queue);
 635
 636                 list_add_tail(&tx_buf->list, &hif_dev->tx.tx_buf);
 637         }
 638
 639         hif_dev->tx.tx_buf_cnt = MAX_TX_URB_NUM;
 640
 641         return 0;
 642 err:
 643         if (tx_buf) {
 644                 kfree(tx_buf->buf);
 645                 kfree(tx_buf);
 646         }
 647         ath9k_hif_usb_dealloc_tx_urbs(hif_dev);
 648         return -ENOMEM;
 649 }
 650
 651 static void ath9k_hif_usb_dealloc_rx_urbs(struct hif_device_usb *hif_dev)
 652 {
 653         usb_kill_anchored_urbs(&hif_dev->rx_submitted);
 654 }
 655
 656 static int ath9k_hif_usb_alloc_rx_urbs(struct hif_device_usb *hif_dev)
 657 {
 658         struct urb *urb = NULL;
 659         struct sk_buff *skb = NULL;
 660         int i, ret;
 661
 662         init_usb_anchor(&hif_dev->rx_submitted);
 663         spin_lock_init(&hif_dev->rx_lock);
 664
 665         for (i = 0; i < MAX_RX_URB_NUM; i++) {
 666
 667                 /* Allocate URB */
 668                 urb = usb_alloc_urb(0, GFP_KERNEL);
 669                 if (urb == NULL) {
 670                         ret = -ENOMEM;
 671                         goto err_urb;
 672                 }
 673
 674                 /* Allocate buffer */
 675                 skb = alloc_skb(MAX_RX_BUF_SIZE, GFP_KERNEL);
 676                 if (!skb) {
 677                         ret = -ENOMEM;
 678                         goto err_skb;
 679                 }
 680
 681                 usb_fill_bulk_urb(urb, hif_dev->udev,
 682                                   usb_rcvbulkpipe(hif_dev->udev,
 683                                                   USB_WLAN_RX_PIPE),
 684                                   skb->data, MAX_RX_BUF_SIZE,
 685                                   ath9k_hif_usb_rx_cb, skb);
 686
 687                 /* Anchor URB */
 688                 usb_anchor_urb(urb, &hif_dev->rx_submitted);
 689
 690                 /* Submit URB */
 691                 ret = usb_submit_urb(urb, GFP_KERNEL);
 692                 if (ret) {
 693                         usb_unanchor_urb(urb);
 694                         goto err_submit;
 695                 }
 696
 697                 /*
 698                  * Drop reference count.
 699                  * This ensures that the URB is freed when killing them.
 700                  */
 701                 usb_free_urb(urb);
 702         }
 703
 704         return 0;
 705
 706 err_submit:
 707         kfree_skb(skb);
 708 err_skb:
 709         usb_free_urb(urb);
 710 err_urb:
 711         ath9k_hif_usb_dealloc_rx_urbs(hif_dev);
 712         return ret;
 713 }
 714
 715 static void ath9k_hif_usb_dealloc_reg_in_urb(struct hif_device_usb *hif_dev)
 716 {
 717         if (hif_dev->reg_in_urb) {
 718                 usb_kill_urb(hif_dev->reg_in_urb);
 719                 if (hif_dev->reg_in_urb->context)
 720                         kfree_skb((void *)hif_dev->reg_in_urb->context);
 721                 usb_free_urb(hif_dev->reg_in_urb);
 722                 hif_dev->reg_in_urb = NULL;
 723         }
 724 }
 725
 726 static int ath9k_hif_usb_alloc_reg_in_urb(struct hif_device_usb *hif_dev)
 727 {
 728         struct sk_buff *skb;
 729
 730         hif_dev->reg_in_urb = usb_alloc_urb(0, GFP_KERNEL);
 731         if (hif_dev->reg_in_urb == NULL)
 732                 return -ENOMEM;
 733
 734         skb = alloc_skb(MAX_REG_IN_BUF_SIZE, GFP_KERNEL);
 735         if (!skb)
 736                 goto err;
 737
 738         usb_fill_bulk_urb(hif_dev->reg_in_urb, hif_dev->udev,
 739                          usb_rcvbulkpipe(hif_dev->udev,
 740                                          USB_REG_IN_PIPE),
 741                          skb->data, MAX_REG_IN_BUF_SIZE,
 742                          ath9k_hif_usb_reg_in_cb, skb);
 743
 744         if (usb_submit_urb(hif_dev->reg_in_urb, GFP_KERNEL) != 0)
 745                 goto err;
 746
 747         return 0;
 748
 749 err:
 750         ath9k_hif_usb_dealloc_reg_in_urb(hif_dev);
 751         return -ENOMEM;
 752 }
 753
 754 static int ath9k_hif_usb_alloc_urbs(struct hif_device_usb *hif_dev)
 755 {
 756         /* Register Write */
 757         init_usb_anchor(&hif_dev->regout_submitted);
 758
 759         /* TX */
 760         if (ath9k_hif_usb_alloc_tx_urbs(hif_dev) < 0)
 761                 goto err;
 762
 763         /* RX */
 764         if (ath9k_hif_usb_alloc_rx_urbs(hif_dev) < 0)
 765                 goto err_rx;
 766
 767         /* Register Read */
 768         if (ath9k_hif_usb_alloc_reg_in_urb(hif_dev) < 0)
 769                 goto err_reg;
 770
 771         return 0;
 772 err_reg:
 773         ath9k_hif_usb_dealloc_rx_urbs(hif_dev);
 774 err_rx:
 775         ath9k_hif_usb_dealloc_tx_urbs(hif_dev);
 776 err:
 777         return -ENOMEM;
 778 }
 779
 780 static void ath9k_hif_usb_dealloc_urbs(struct hif_device_usb *hif_dev)
 781 {
 782         usb_kill_anchored_urbs(&hif_dev->regout_submitted);
 783         ath9k_hif_usb_dealloc_reg_in_urb(hif_dev);
 784         ath9k_hif_usb_dealloc_tx_urbs(hif_dev);
 785         ath9k_hif_usb_dealloc_rx_urbs(hif_dev);
 786 }
 787
 788 static int ath9k_hif_usb_download_fw(struct hif_device_usb *hif_dev,
 789                                      u32 drv_info)
 790 {
 791         int transfer, err;
 792         const void *data = hif_dev->firmware->data;
 793         size_t len = hif_dev->firmware->size;
 794         u32 addr = AR9271_FIRMWARE;
 795         u8 *buf = kzalloc(4096, GFP_KERNEL);
 796         u32 firm_offset;
 797
 798         if (!buf)
 799                 return -ENOMEM;
 800
 801         while (len) {
 802                 transfer = min_t(int, len, 4096);
 803                 memcpy(buf, data, transfer);
 804
 805                 err = usb_control_msg(hif_dev->udev,
 806                                       usb_sndctrlpipe(hif_dev->udev, 0),
 807                                       FIRMWARE_DOWNLOAD, 0x40 | USB_DIR_OUT,
 808                                       addr >> 8, 0, buf, transfer, HZ);
 809                 if (err < 0) {
 810                         kfree(buf);
 811                         return err;
 812                 }
 813
 814                 len -= transfer;
 815                 data += transfer;
 816                 addr += transfer;
 817         }
 818         kfree(buf);
 819
 820         if (IS_AR7010_DEVICE(drv_info))
 821                 firm_offset = AR7010_FIRMWARE_TEXT;
 822         else
 823                 firm_offset = AR9271_FIRMWARE_TEXT;
 824
 825         /*
 826          * Issue FW download complete command to firmware.
 827          */
 828         err = usb_control_msg(hif_dev->udev, usb_sndctrlpipe(hif_dev->udev, 0),
 829                               FIRMWARE_DOWNLOAD_COMP,
 830                               0x40 | USB_DIR_OUT,
 831                               firm_offset >> 8, 0, NULL, 0, HZ);
 832         if (err)
 833                 return -EIO;
 834
 835         dev_info(&hif_dev->udev->dev, "ath9k_htc: Transferred FW: %s, size: %ld\n",
 836                  hif_dev->fw_name, (unsigned long) hif_dev->firmware->size);
 837
 838         return 0;
 839 }
 840
 841 static int ath9k_hif_usb_dev_init(struct hif_device_usb *hif_dev, u32 drv_info)
 842 {
 843         int ret, idx;
 844         struct usb_host_interface *alt = &hif_dev->interface->altsetting[0];
 845         struct usb_endpoint_descriptor *endp;
 846
 847         /* Request firmware */
 848         ret = request_firmware(&hif_dev->firmware, hif_dev->fw_name,
 849                                &hif_dev->udev->dev);
 850         if (ret) {
 851                 dev_err(&hif_dev->udev->dev,
 852                         "ath9k_htc: Firmware - %s not found\n", hif_dev->fw_name);
 853                 goto err_fw_req;
 854         }
 855
 856         /* Download firmware */
 857         ret = ath9k_hif_usb_download_fw(hif_dev, drv_info);
 858         if (ret) {
 859                 dev_err(&hif_dev->udev->dev,
 860                         "ath9k_htc: Firmware - %s download failed\n",
 861                         hif_dev->fw_name);
 862                 goto err_fw_download;
 863         }
 864
 865         /* On downloading the firmware to the target, the USB descriptor of EP4
 866          * is 'patched' to change the type of the endpoint to Bulk. This will
 867          * bring down CPU usage during the scan period.
 868          */
 869         for (idx = 0; idx < alt->desc.bNumEndpoints; idx++) {
 870                 endp = &alt->endpoint[idx].desc;
 871                 if ((endp->bmAttributes & USB_ENDPOINT_XFERTYPE_MASK)
 872                                 == USB_ENDPOINT_XFER_INT) {
 873                         endp->bmAttributes &= ~USB_ENDPOINT_XFERTYPE_MASK;
 874                         endp->bmAttributes |= USB_ENDPOINT_XFER_BULK;
 875                         endp->bInterval = 0;
 876                 }
 877         }
 878
 879         /* Alloc URBs */
 880         ret = ath9k_hif_usb_alloc_urbs(hif_dev);
 881         if (ret) {
 882                 dev_err(&hif_dev->udev->dev,
 883                         "ath9k_htc: Unable to allocate URBs\n");
 884                 goto err_urb;
 885         }
 886
 887         return 0;
 888
 889 err_urb:
 890         ath9k_hif_usb_dealloc_urbs(hif_dev);
 891 err_fw_download:
 892         release_firmware(hif_dev->firmware);
 893 err_fw_req:
 894         hif_dev->firmware = NULL;
 895         return ret;
 896 }
 897
 898 static void ath9k_hif_usb_dev_deinit(struct hif_device_usb *hif_dev)
 899 {
 900         ath9k_hif_usb_dealloc_urbs(hif_dev);
 901         if (hif_dev->firmware)
 902                 release_firmware(hif_dev->firmware);
 903 }
 904
 905 static int ath9k_hif_usb_probe(struct usb_interface *interface,
 906                                const struct usb_device_id *id)
 907 {
 908         struct usb_device *udev = interface_to_usbdev(interface);
 909         struct hif_device_usb *hif_dev;
 910         int ret = 0;
 911
 912         hif_dev = kzalloc(sizeof(struct hif_device_usb), GFP_KERNEL);
 913         if (!hif_dev) {
 914                 ret = -ENOMEM;
 915                 goto err_alloc;
 916         }
 917
 918         usb_get_dev(udev);
 919         hif_dev->udev = udev;
 920         hif_dev->interface = interface;
 921         hif_dev->device_id = id->idProduct;
 922 #ifdef CONFIG_PM
 923         udev->reset_resume = 1;
 924 #endif
 925         usb_set_intfdata(interface, hif_dev);
 926
 927         hif_dev->htc_handle = ath9k_htc_hw_alloc(hif_dev, &hif_usb,
 928                                                  &hif_dev->udev->dev);
 929         if (hif_dev->htc_handle == NULL) {
 930                 ret = -ENOMEM;
 931                 goto err_htc_hw_alloc;
 932         }
 933
 934         /* Find out which firmware to load */
 935
 936         if (IS_AR7010_DEVICE(id->driver_info))
 937                 if (le16_to_cpu(udev->descriptor.bcdDevice) == 0x0202)
 938                         hif_dev->fw_name = FIRMWARE_AR7010_1_1;
 939                 else
 940                         hif_dev->fw_name = FIRMWARE_AR7010;
 941         else
 942                 hif_dev->fw_name = FIRMWARE_AR9271;
 943
 944         ret = ath9k_hif_usb_dev_init(hif_dev, id->driver_info);
 945         if (ret) {
 946                 ret = -EINVAL;
 947                 goto err_hif_init_usb;
 948         }
 949
 950         ret = ath9k_htc_hw_init(hif_dev->htc_handle,
 951                                 &hif_dev->udev->dev, hif_dev->device_id,
 952                                 hif_dev->udev->product, id->driver_info);
 953         if (ret) {
 954                 ret = -EINVAL;
 955                 goto err_htc_hw_init;
 956         }
 957
 958         dev_info(&hif_dev->udev->dev, "ath9k_htc: USB layer initialized\n");
 959
 960         return 0;
 961
 962 err_htc_hw_init:
 963         ath9k_hif_usb_dev_deinit(hif_dev);
 964 err_hif_init_usb:
 965         ath9k_htc_hw_free(hif_dev->htc_handle);
 966 err_htc_hw_alloc:
 967         usb_set_intfdata(interface, NULL);
 968         kfree(hif_dev);
 969         usb_put_dev(udev);
 970 err_alloc:
 971         return ret;
 972 }
 973
 974 static void ath9k_hif_usb_reboot(struct usb_device *udev)
 975 {
 976         u32 reboot_cmd = 0xffffffff;
 977         void *buf;
 978         int ret;
 979
 980         buf = kmemdup(&reboot_cmd, 4, GFP_KERNEL);
 981         if (!buf)
 982                 return;
 983
 984         ret = usb_bulk_msg(udev, usb_sndbulkpipe(udev, USB_REG_OUT_PIPE),
 985                            buf, 4, NULL, HZ);
 986         if (ret)
 987                 dev_err(&udev->dev, "ath9k_htc: USB reboot failed\n");
 988
 989         kfree(buf);
 990 }
 991
 992 static void ath9k_hif_usb_disconnect(struct usb_interface *interface)
 993 {
 994         struct usb_device *udev = interface_to_usbdev(interface);
 995         struct hif_device_usb *hif_dev = usb_get_intfdata(interface);
 996
 997         if (hif_dev) {
 998                 ath9k_htc_hw_deinit(hif_dev->htc_handle,
 999                     (udev->state == USB_STATE_NOTATTACHED) ? true : false);
1000                 ath9k_htc_hw_free(hif_dev->htc_handle);
1001                 ath9k_hif_usb_dev_deinit(hif_dev);
1002                 usb_set_intfdata(interface, NULL);
1003         }
1004
1005         if (hif_dev->flags & HIF_USB_START)
1006                 ath9k_hif_usb_reboot(udev);
1007
1008         kfree(hif_dev);
1009         dev_info(&udev->dev, "ath9k_htc: USB layer deinitialized\n");
1010         usb_put_dev(udev);
1011 }
1012
1013 #ifdef CONFIG_PM
1014 static int ath9k_hif_usb_suspend(struct usb_interface *interface,
1015                                  pm_message_t message)
1016 {
1017         struct hif_device_usb *hif_dev = usb_get_intfdata(interface);
1018
1019         /*
1020          * The device has to be set to FULLSLEEP mode in case no
1021          * interface is up.
1022          */
1023         if (!(hif_dev->flags & HIF_USB_START))
1024                 ath9k_htc_suspend(hif_dev->htc_handle);
1025
1026         ath9k_hif_usb_dealloc_urbs(hif_dev);
1027
1028         return 0;
1029 }
1030
1031 static int ath9k_hif_usb_resume(struct usb_interface *interface)
1032 {
1033         struct hif_device_usb *hif_dev = usb_get_intfdata(interface);
1034         struct htc_target *htc_handle = hif_dev->htc_handle;
1035         int ret;
1036
1037         ret = ath9k_hif_usb_alloc_urbs(hif_dev);
1038         if (ret)
1039                 return ret;
1040
1041         if (hif_dev->firmware) {
1042                 ret = ath9k_hif_usb_download_fw(hif_dev,
1043                                 htc_handle->drv_priv->ah->hw_version.usbdev);
1044                 if (ret)
1045                         goto fail_resume;
1046         } else {
1047                 ath9k_hif_usb_dealloc_urbs(hif_dev);
1048                 return -EIO;
1049         }
1050
1051         mdelay(100);
1052
1053         ret = ath9k_htc_resume(htc_handle);
1054
1055         if (ret)
1056                 goto fail_resume;
1057
1058         return 0;
1059
1060 fail_resume:
1061         ath9k_hif_usb_dealloc_urbs(hif_dev);
1062
1063         return ret;
1064 }
1065 #endif
1066
1067 static struct usb_driver ath9k_hif_usb_driver = {
1068         .name = "ath9k_hif_usb",
1069         .probe = ath9k_hif_usb_probe,
1070         .disconnect = ath9k_hif_usb_disconnect,
1071 #ifdef CONFIG_PM
1072         .suspend = ath9k_hif_usb_suspend,
1073         .resume = ath9k_hif_usb_resume,
1074         .reset_resume = ath9k_hif_usb_resume,
1075 #endif
1076         .id_table = ath9k_hif_usb_ids,
1077         .soft_unbind = 1,
1078 };
1079
1080 int ath9k_hif_usb_init(void)
1081 {
1082         return usb_register(&ath9k_hif_usb_driver);
1083 }
1084
1085 void ath9k_hif_usb_exit(void)
1086 {
1087         usb_deregister(&ath9k_hif_usb_driver);
1088 }