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