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 #define ATH9K_FW_USB_DEV(devid, fw)                                     \
  20         { USB_DEVICE(0x0cf3, devid), .driver_info = (unsigned long) fw }
  21
  22 static struct usb_device_id ath9k_hif_usb_ids[] = {
  23         ATH9K_FW_USB_DEV(0x9271, "ar9271.fw"),
  24         ATH9K_FW_USB_DEV(0x1006, "ar9271.fw"),
  25         { },
  26 };
  27
  28 MODULE_DEVICE_TABLE(usb, ath9k_hif_usb_ids);
  29
  30 static int __hif_usb_tx(struct hif_device_usb *hif_dev);
  31
  32 static void hif_usb_regout_cb(struct urb *urb)
  33 {
  34         struct cmd_buf *cmd = (struct cmd_buf *)urb->context;
  35
  36         switch (urb->status) {
  37         case 0:
  38                 break;
  39         case -ENOENT:
  40         case -ECONNRESET:
  41         case -ENODEV:
  42         case -ESHUTDOWN:
  43                 goto free;
  44         default:
  45                 break;
  46         }
  47
  48         if (cmd) {
  49                 ath9k_htc_txcompletion_cb(cmd->hif_dev->htc_handle,
  50                                           cmd->skb, 1);
  51                 kfree(cmd);
  52         }
  53
  54         return;
  55 free:
  56         kfree_skb(cmd->skb);
  57         kfree(cmd);
  58 }
  59
  60 static int hif_usb_send_regout(struct hif_device_usb *hif_dev,
  61                                struct sk_buff *skb)
  62 {
  63         struct urb *urb;
  64         struct cmd_buf *cmd;
  65         int ret = 0;
  66
  67         urb = usb_alloc_urb(0, GFP_KERNEL);
  68         if (urb == NULL)
  69                 return -ENOMEM;
  70
  71         cmd = kzalloc(sizeof(*cmd), GFP_KERNEL);
  72         if (cmd == NULL) {
  73                 usb_free_urb(urb);
  74                 return -ENOMEM;
  75         }
  76
  77         cmd->skb = skb;
  78         cmd->hif_dev = hif_dev;
  79
  80         usb_fill_int_urb(urb, hif_dev->udev,
  81                          usb_sndintpipe(hif_dev->udev, USB_REG_OUT_PIPE),
  82                          skb->data, skb->len,
  83                          hif_usb_regout_cb, cmd, 1);
  84
  85         usb_anchor_urb(urb, &hif_dev->regout_submitted);
  86         ret = usb_submit_urb(urb, GFP_KERNEL);
  87         if (ret) {
  88                 usb_unanchor_urb(urb);
  89                 kfree(cmd);
  90         }
  91         usb_free_urb(urb);
  92
  93         return ret;
  94 }
  95
  96 static void hif_usb_tx_cb(struct urb *urb)
  97 {
  98         struct tx_buf *tx_buf = (struct tx_buf *) urb->context;
  99         struct hif_device_usb *hif_dev = tx_buf->hif_dev;
 100         struct sk_buff *skb;
 101         bool drop, flush;
 102
 103         if (!hif_dev)
 104                 return;
 105
 106         switch (urb->status) {
 107         case 0:
 108                 break;
 109         case -ENOENT:
 110         case -ECONNRESET:
 111                 break;
 112         case -ENODEV:
 113         case -ESHUTDOWN:
 114                 return;
 115         default:
 116                 break;
 117         }
 118
 119         if (tx_buf) {
 120                 spin_lock(&hif_dev->tx.tx_lock);
 121                 drop = !!(hif_dev->tx.flags & HIF_USB_TX_STOP);
 122                 flush = !!(hif_dev->tx.flags & HIF_USB_TX_FLUSH);
 123                 spin_unlock(&hif_dev->tx.tx_lock);
 124
 125                 while ((skb = __skb_dequeue(&tx_buf->skb_queue)) != NULL) {
 126                         if (!drop && !flush) {
 127                                 ath9k_htc_txcompletion_cb(hif_dev->htc_handle,
 128                                                           skb, 1);
 129                                 TX_STAT_INC(skb_completed);
 130                         } else {
 131                                 dev_kfree_skb_any(skb);
 132                         }
 133                 }
 134
 135                 if (flush)
 136                         return;
 137
 138                 tx_buf->len = tx_buf->offset = 0;
 139                 __skb_queue_head_init(&tx_buf->skb_queue);
 140
 141                 spin_lock(&hif_dev->tx.tx_lock);
 142                 list_del(&tx_buf->list);
 143                 list_add_tail(&tx_buf->list, &hif_dev->tx.tx_buf);
 144                 hif_dev->tx.tx_buf_cnt++;
 145                 if (!drop)
 146                         __hif_usb_tx(hif_dev); /* Check for pending SKBs */
 147                 TX_STAT_INC(buf_completed);
 148                 spin_unlock(&hif_dev->tx.tx_lock);
 149         }
 150 }
 151
 152 static inline void ath9k_skb_queue_purge(struct sk_buff_head *list)
 153 {
 154         struct sk_buff *skb;
 155         while ((skb = __skb_dequeue(list)) != NULL)
 156                 dev_kfree_skb_any(skb);
 157 }
 158
 159 /* TX lock has to be taken */
 160 static int __hif_usb_tx(struct hif_device_usb *hif_dev)
 161 {
 162         struct tx_buf *tx_buf = NULL;
 163         struct sk_buff *nskb = NULL;
 164         int ret = 0, i;
 165         u16 *hdr, tx_skb_cnt = 0;
 166         u8 *buf;
 167
 168         if (hif_dev->tx.tx_skb_cnt == 0)
 169                 return 0;
 170
 171         /* Check if a free TX buffer is available */
 172         if (list_empty(&hif_dev->tx.tx_buf))
 173                 return 0;
 174
 175         tx_buf = list_first_entry(&hif_dev->tx.tx_buf, struct tx_buf, list);
 176         list_del(&tx_buf->list);
 177         list_add_tail(&tx_buf->list, &hif_dev->tx.tx_pending);
 178         hif_dev->tx.tx_buf_cnt--;
 179
 180         tx_skb_cnt = min_t(u16, hif_dev->tx.tx_skb_cnt, MAX_TX_AGGR_NUM);
 181
 182         for (i = 0; i < tx_skb_cnt; i++) {
 183                 nskb = __skb_dequeue(&hif_dev->tx.tx_skb_queue);
 184
 185                 /* Should never be NULL */
 186                 BUG_ON(!nskb);
 187
 188                 hif_dev->tx.tx_skb_cnt--;
 189
 190                 buf = tx_buf->buf;
 191                 buf += tx_buf->offset;
 192                 hdr = (u16 *)buf;
 193                 *hdr++ = nskb->len;
 194                 *hdr++ = ATH_USB_TX_STREAM_MODE_TAG;
 195                 buf += 4;
 196                 memcpy(buf, nskb->data, nskb->len);
 197                 tx_buf->len = nskb->len + 4;
 198
 199                 if (i < (tx_skb_cnt - 1))
 200                         tx_buf->offset += (((tx_buf->len - 1) / 4) + 1) * 4;
 201
 202                 if (i == (tx_skb_cnt - 1))
 203                         tx_buf->len += tx_buf->offset;
 204
 205                 __skb_queue_tail(&tx_buf->skb_queue, nskb);
 206                 TX_STAT_INC(skb_queued);
 207         }
 208
 209         usb_fill_bulk_urb(tx_buf->urb, hif_dev->udev,
 210                           usb_sndbulkpipe(hif_dev->udev, USB_WLAN_TX_PIPE),
 211                           tx_buf->buf, tx_buf->len,
 212                           hif_usb_tx_cb, tx_buf);
 213
 214         ret = usb_submit_urb(tx_buf->urb, GFP_ATOMIC);
 215         if (ret) {
 216                 tx_buf->len = tx_buf->offset = 0;
 217                 ath9k_skb_queue_purge(&tx_buf->skb_queue);
 218                 __skb_queue_head_init(&tx_buf->skb_queue);
 219                 list_move_tail(&tx_buf->list, &hif_dev->tx.tx_buf);
 220                 hif_dev->tx.tx_buf_cnt++;
 221         }
 222
 223         if (!ret)
 224                 TX_STAT_INC(buf_queued);
 225
 226         return ret;
 227 }
 228
 229 static int hif_usb_send_tx(struct hif_device_usb *hif_dev, struct sk_buff *skb,
 230                            struct ath9k_htc_tx_ctl *tx_ctl)
 231 {
 232         unsigned long flags;
 233
 234         spin_lock_irqsave(&hif_dev->tx.tx_lock, flags);
 235
 236         if (hif_dev->tx.flags & HIF_USB_TX_STOP) {
 237                 spin_unlock_irqrestore(&hif_dev->tx.tx_lock, flags);
 238                 return -ENODEV;
 239         }
 240
 241         /* Check if the max queue count has been reached */
 242         if (hif_dev->tx.tx_skb_cnt > MAX_TX_BUF_NUM) {
 243                 spin_unlock_irqrestore(&hif_dev->tx.tx_lock, flags);
 244                 return -ENOMEM;
 245         }
 246
 247         __skb_queue_tail(&hif_dev->tx.tx_skb_queue, skb);
 248         hif_dev->tx.tx_skb_cnt++;
 249
 250         /* Send normal frames immediately */
 251         if (!tx_ctl || (tx_ctl && (tx_ctl->type == ATH9K_HTC_NORMAL)))
 252                 __hif_usb_tx(hif_dev);
 253
 254         /* Check if AMPDUs have to be sent immediately */
 255         if (tx_ctl && (tx_ctl->type == ATH9K_HTC_AMPDU) &&
 256             (hif_dev->tx.tx_buf_cnt == MAX_TX_URB_NUM) &&
 257             (hif_dev->tx.tx_skb_cnt < 2)) {
 258                 __hif_usb_tx(hif_dev);
 259         }
 260
 261         spin_unlock_irqrestore(&hif_dev->tx.tx_lock, flags);
 262
 263         return 0;
 264 }
 265
 266 static void hif_usb_start(void *hif_handle, u8 pipe_id)
 267 {
 268         struct hif_device_usb *hif_dev = (struct hif_device_usb *)hif_handle;
 269         unsigned long flags;
 270
 271         hif_dev->flags |= HIF_USB_START;
 272
 273         spin_lock_irqsave(&hif_dev->tx.tx_lock, flags);
 274         hif_dev->tx.flags &= ~HIF_USB_TX_STOP;
 275         spin_unlock_irqrestore(&hif_dev->tx.tx_lock, flags);
 276 }
 277
 278 static void hif_usb_stop(void *hif_handle, u8 pipe_id)
 279 {
 280         struct hif_device_usb *hif_dev = (struct hif_device_usb *)hif_handle;
 281         unsigned long flags;
 282
 283         spin_lock_irqsave(&hif_dev->tx.tx_lock, flags);
 284         ath9k_skb_queue_purge(&hif_dev->tx.tx_skb_queue);
 285         hif_dev->tx.tx_skb_cnt = 0;
 286         hif_dev->tx.flags |= HIF_USB_TX_STOP;
 287         spin_unlock_irqrestore(&hif_dev->tx.tx_lock, flags);
 288 }
 289
 290 static int hif_usb_send(void *hif_handle, u8 pipe_id, struct sk_buff *skb,
 291                         struct ath9k_htc_tx_ctl *tx_ctl)
 292 {
 293         struct hif_device_usb *hif_dev = (struct hif_device_usb *)hif_handle;
 294         int ret = 0;
 295
 296         switch (pipe_id) {
 297         case USB_WLAN_TX_PIPE:
 298                 ret = hif_usb_send_tx(hif_dev, skb, tx_ctl);
 299                 break;
 300         case USB_REG_OUT_PIPE:
 301                 ret = hif_usb_send_regout(hif_dev, skb);
 302                 break;
 303         default:
 304                 dev_err(&hif_dev->udev->dev,
 305                         "ath9k_htc: Invalid TX pipe: %d\n", pipe_id);
 306                 ret = -EINVAL;
 307                 break;
 308         }
 309
 310         return ret;
 311 }
 312
 313 static struct ath9k_htc_hif hif_usb = {
 314         .transport = ATH9K_HIF_USB,
 315         .name = "ath9k_hif_usb",
 316
 317         .control_ul_pipe = USB_REG_OUT_PIPE,
 318         .control_dl_pipe = USB_REG_IN_PIPE,
 319
 320         .start = hif_usb_start,
 321         .stop = hif_usb_stop,
 322         .send = hif_usb_send,
 323 };
 324
 325 static void ath9k_hif_usb_rx_stream(struct hif_device_usb *hif_dev,
 326                                     struct sk_buff *skb)
 327 {
 328         struct sk_buff *nskb, *skb_pool[MAX_PKT_NUM_IN_TRANSFER];
 329         int index = 0, i = 0, chk_idx, len = skb->len;
 330         int rx_remain_len = 0, rx_pkt_len = 0;
 331         u16 pkt_len, pkt_tag, pool_index = 0;
 332         u8 *ptr;
 333
 334         spin_lock(&hif_dev->rx_lock);
 335
 336         rx_remain_len = hif_dev->rx_remain_len;
 337         rx_pkt_len = hif_dev->rx_transfer_len;
 338
 339         if (rx_remain_len != 0) {
 340                 struct sk_buff *remain_skb = hif_dev->remain_skb;
 341
 342                 if (remain_skb) {
 343                         ptr = (u8 *) remain_skb->data;
 344
 345                         index = rx_remain_len;
 346                         rx_remain_len -= hif_dev->rx_pad_len;
 347                         ptr += rx_pkt_len;
 348
 349                         memcpy(ptr, skb->data, rx_remain_len);
 350
 351                         rx_pkt_len += rx_remain_len;
 352                         hif_dev->rx_remain_len = 0;
 353                         skb_put(remain_skb, rx_pkt_len);
 354
 355                         skb_pool[pool_index++] = remain_skb;
 356
 357                 } else {
 358                         index = rx_remain_len;
 359                 }
 360         }
 361
 362         spin_unlock(&hif_dev->rx_lock);
 363
 364         while (index < len) {
 365                 ptr = (u8 *) skb->data;
 366
 367                 pkt_len = ptr[index] + (ptr[index+1] << 8);
 368                 pkt_tag = ptr[index+2] + (ptr[index+3] << 8);
 369
 370                 if (pkt_tag == ATH_USB_RX_STREAM_MODE_TAG) {
 371                         u16 pad_len;
 372
 373                         pad_len = 4 - (pkt_len & 0x3);
 374                         if (pad_len == 4)
 375                                 pad_len = 0;
 376
 377                         chk_idx = index;
 378                         index = index + 4 + pkt_len + pad_len;
 379
 380                         if (index > MAX_RX_BUF_SIZE) {
 381                                 spin_lock(&hif_dev->rx_lock);
 382                                 hif_dev->rx_remain_len = index - MAX_RX_BUF_SIZE;
 383                                 hif_dev->rx_transfer_len =
 384                                         MAX_RX_BUF_SIZE - chk_idx - 4;
 385                                 hif_dev->rx_pad_len = pad_len;
 386
 387                                 nskb = __dev_alloc_skb(pkt_len + 32,
 388                                                        GFP_ATOMIC);
 389                                 if (!nskb) {
 390                                         dev_err(&hif_dev->udev->dev,
 391                                         "ath9k_htc: RX memory allocation"
 392                                         " error\n");
 393                                         spin_unlock(&hif_dev->rx_lock);
 394                                         goto err;
 395                                 }
 396                                 skb_reserve(nskb, 32);
 397                                 RX_STAT_INC(skb_allocated);
 398
 399                                 memcpy(nskb->data, &(skb->data[chk_idx+4]),
 400                                        hif_dev->rx_transfer_len);
 401
 402                                 /* Record the buffer pointer */
 403                                 hif_dev->remain_skb = nskb;
 404                                 spin_unlock(&hif_dev->rx_lock);
 405                         } else {
 406                                 nskb = __dev_alloc_skb(pkt_len + 32, GFP_ATOMIC);
 407                                 if (!nskb) {
 408                                         dev_err(&hif_dev->udev->dev,
 409                                         "ath9k_htc: RX memory allocation"
 410                                         " error\n");
 411                                         goto err;
 412                                 }
 413                                 skb_reserve(nskb, 32);
 414                                 RX_STAT_INC(skb_allocated);
 415
 416                                 memcpy(nskb->data, &(skb->data[chk_idx+4]), pkt_len);
 417                                 skb_put(nskb, pkt_len);
 418                                 skb_pool[pool_index++] = nskb;
 419                         }
 420                 } else {
 421                         RX_STAT_INC(skb_dropped);
 422                         return;
 423                 }
 424         }
 425
 426 err:
 427         for (i = 0; i < pool_index; i++) {
 428                 ath9k_htc_rx_msg(hif_dev->htc_handle, skb_pool[i],
 429                                  skb_pool[i]->len, USB_WLAN_RX_PIPE);
 430                 RX_STAT_INC(skb_completed);
 431         }
 432 }
 433
 434 static void ath9k_hif_usb_rx_cb(struct urb *urb)
 435 {
 436         struct sk_buff *skb = (struct sk_buff *) urb->context;
 437         struct hif_device_usb *hif_dev = (struct hif_device_usb *)
 438                 usb_get_intfdata(usb_ifnum_to_if(urb->dev, 0));
 439         int ret;
 440
 441         if (!skb)
 442                 return;
 443
 444         if (!hif_dev)
 445                 goto free;
 446
 447         switch (urb->status) {
 448         case 0:
 449                 break;
 450         case -ENOENT:
 451         case -ECONNRESET:
 452         case -ENODEV:
 453         case -ESHUTDOWN:
 454                 goto free;
 455         default:
 456                 goto resubmit;
 457         }
 458
 459         if (likely(urb->actual_length != 0)) {
 460                 skb_put(skb, urb->actual_length);
 461                 ath9k_hif_usb_rx_stream(hif_dev, skb);
 462         }
 463
 464 resubmit:
 465         skb_reset_tail_pointer(skb);
 466         skb_trim(skb, 0);
 467
 468         usb_anchor_urb(urb, &hif_dev->rx_submitted);
 469         ret = usb_submit_urb(urb, GFP_ATOMIC);
 470         if (ret) {
 471                 usb_unanchor_urb(urb);
 472                 goto free;
 473         }
 474
 475         return;
 476 free:
 477         kfree_skb(skb);
 478 }
 479
 480 static void ath9k_hif_usb_reg_in_cb(struct urb *urb)
 481 {
 482         struct sk_buff *skb = (struct sk_buff *) urb->context;
 483         struct sk_buff *nskb;
 484         struct hif_device_usb *hif_dev = (struct hif_device_usb *)
 485                 usb_get_intfdata(usb_ifnum_to_if(urb->dev, 0));
 486         int ret;
 487
 488         if (!skb)
 489                 return;
 490
 491         if (!hif_dev)
 492                 goto free;
 493
 494         switch (urb->status) {
 495         case 0:
 496                 break;
 497         case -ENOENT:
 498         case -ECONNRESET:
 499         case -ENODEV:
 500         case -ESHUTDOWN:
 501                 goto free;
 502         default:
 503                 goto resubmit;
 504         }
 505
 506         if (likely(urb->actual_length != 0)) {
 507                 skb_put(skb, urb->actual_length);
 508
 509                 nskb = alloc_skb(MAX_REG_IN_BUF_SIZE, GFP_ATOMIC);
 510                 if (!nskb)
 511                         goto resubmit;
 512
 513                 usb_fill_int_urb(urb, hif_dev->udev,
 514                                  usb_rcvintpipe(hif_dev->udev, USB_REG_IN_PIPE),
 515                                  nskb->data, MAX_REG_IN_BUF_SIZE,
 516                                  ath9k_hif_usb_reg_in_cb, nskb, 1);
 517
 518                 ret = usb_submit_urb(urb, GFP_ATOMIC);
 519                 if (ret) {
 520                         kfree_skb(nskb);
 521                         goto free;
 522                 }
 523
 524                 ath9k_htc_rx_msg(hif_dev->htc_handle, skb,
 525                                  skb->len, USB_REG_IN_PIPE);
 526
 527                 return;
 528         }
 529
 530 resubmit:
 531         skb_reset_tail_pointer(skb);
 532         skb_trim(skb, 0);
 533
 534         ret = usb_submit_urb(urb, GFP_ATOMIC);
 535         if (ret)
 536                 goto free;
 537
 538         return;
 539 free:
 540         kfree_skb(skb);
 541         urb->context = NULL;
 542 }
 543
 544 static void ath9k_hif_usb_dealloc_tx_urbs(struct hif_device_usb *hif_dev)
 545 {
 546         unsigned long flags;
 547         struct tx_buf *tx_buf = NULL, *tx_buf_tmp = NULL;
 548
 549         list_for_each_entry_safe(tx_buf, tx_buf_tmp, &hif_dev->tx.tx_buf, list) {
 550                 list_del(&tx_buf->list);
 551                 usb_free_urb(tx_buf->urb);
 552                 kfree(tx_buf->buf);
 553                 kfree(tx_buf);
 554         }
 555
 556         spin_lock_irqsave(&hif_dev->tx.tx_lock, flags);
 557         hif_dev->tx.flags |= HIF_USB_TX_FLUSH;
 558         spin_unlock_irqrestore(&hif_dev->tx.tx_lock, flags);
 559
 560         list_for_each_entry_safe(tx_buf, tx_buf_tmp,
 561                                  &hif_dev->tx.tx_pending, list) {
 562                 usb_kill_urb(tx_buf->urb);
 563                 list_del(&tx_buf->list);
 564                 usb_free_urb(tx_buf->urb);
 565                 kfree(tx_buf->buf);
 566                 kfree(tx_buf);
 567         }
 568
 569         spin_lock_irqsave(&hif_dev->tx.tx_lock, flags);
 570         hif_dev->tx.flags &= ~HIF_USB_TX_FLUSH;
 571         spin_unlock_irqrestore(&hif_dev->tx.tx_lock, flags);
 572 }
 573
 574 static int ath9k_hif_usb_alloc_tx_urbs(struct hif_device_usb *hif_dev)
 575 {
 576         struct tx_buf *tx_buf;
 577         int i;
 578
 579         INIT_LIST_HEAD(&hif_dev->tx.tx_buf);
 580         INIT_LIST_HEAD(&hif_dev->tx.tx_pending);
 581         spin_lock_init(&hif_dev->tx.tx_lock);
 582         __skb_queue_head_init(&hif_dev->tx.tx_skb_queue);
 583
 584         for (i = 0; i < MAX_TX_URB_NUM; i++) {
 585                 tx_buf = kzalloc(sizeof(struct tx_buf), GFP_KERNEL);
 586                 if (!tx_buf)
 587                         goto err;
 588
 589                 tx_buf->buf = kzalloc(MAX_TX_BUF_SIZE, GFP_KERNEL);
 590                 if (!tx_buf->buf)
 591                         goto err;
 592
 593                 tx_buf->urb = usb_alloc_urb(0, GFP_KERNEL);
 594                 if (!tx_buf->urb)
 595                         goto err;
 596
 597                 tx_buf->hif_dev = hif_dev;
 598                 __skb_queue_head_init(&tx_buf->skb_queue);
 599
 600                 list_add_tail(&tx_buf->list, &hif_dev->tx.tx_buf);
 601         }
 602
 603         hif_dev->tx.tx_buf_cnt = MAX_TX_URB_NUM;
 604
 605         return 0;
 606 err:
 607         ath9k_hif_usb_dealloc_tx_urbs(hif_dev);
 608         return -ENOMEM;
 609 }
 610
 611 static void ath9k_hif_usb_dealloc_rx_urbs(struct hif_device_usb *hif_dev)
 612 {
 613         usb_kill_anchored_urbs(&hif_dev->rx_submitted);
 614 }
 615
 616 static int ath9k_hif_usb_alloc_rx_urbs(struct hif_device_usb *hif_dev)
 617 {
 618         struct urb *urb = NULL;
 619         struct sk_buff *skb = NULL;
 620         int i, ret;
 621
 622         init_usb_anchor(&hif_dev->rx_submitted);
 623         spin_lock_init(&hif_dev->rx_lock);
 624
 625         for (i = 0; i < MAX_RX_URB_NUM; i++) {
 626
 627                 /* Allocate URB */
 628                 urb = usb_alloc_urb(0, GFP_KERNEL);
 629                 if (urb == NULL) {
 630                         ret = -ENOMEM;
 631                         goto err_urb;
 632                 }
 633
 634                 /* Allocate buffer */
 635                 skb = alloc_skb(MAX_RX_BUF_SIZE, GFP_KERNEL);
 636                 if (!skb) {
 637                         ret = -ENOMEM;
 638                         goto err_skb;
 639                 }
 640
 641                 usb_fill_bulk_urb(urb, hif_dev->udev,
 642                                   usb_rcvbulkpipe(hif_dev->udev,
 643                                                   USB_WLAN_RX_PIPE),
 644                                   skb->data, MAX_RX_BUF_SIZE,
 645                                   ath9k_hif_usb_rx_cb, skb);
 646
 647                 /* Anchor URB */
 648                 usb_anchor_urb(urb, &hif_dev->rx_submitted);
 649
 650                 /* Submit URB */
 651                 ret = usb_submit_urb(urb, GFP_KERNEL);
 652                 if (ret) {
 653                         usb_unanchor_urb(urb);
 654                         goto err_submit;
 655                 }
 656
 657                 /*
 658                  * Drop reference count.
 659                  * This ensures that the URB is freed when killing them.
 660                  */
 661                 usb_free_urb(urb);
 662         }
 663
 664         return 0;
 665
 666 err_submit:
 667         kfree_skb(skb);
 668 err_skb:
 669         usb_free_urb(urb);
 670 err_urb:
 671         ath9k_hif_usb_dealloc_rx_urbs(hif_dev);
 672         return ret;
 673 }
 674
 675 static void ath9k_hif_usb_dealloc_reg_in_urb(struct hif_device_usb *hif_dev)
 676 {
 677         if (hif_dev->reg_in_urb) {
 678                 usb_kill_urb(hif_dev->reg_in_urb);
 679                 if (hif_dev->reg_in_urb->context)
 680                         kfree_skb((void *)hif_dev->reg_in_urb->context);
 681                 usb_free_urb(hif_dev->reg_in_urb);
 682                 hif_dev->reg_in_urb = NULL;
 683         }
 684 }
 685
 686 static int ath9k_hif_usb_alloc_reg_in_urb(struct hif_device_usb *hif_dev)
 687 {
 688         struct sk_buff *skb;
 689
 690         hif_dev->reg_in_urb = usb_alloc_urb(0, GFP_KERNEL);
 691         if (hif_dev->reg_in_urb == NULL)
 692                 return -ENOMEM;
 693
 694         skb = alloc_skb(MAX_REG_IN_BUF_SIZE, GFP_KERNEL);
 695         if (!skb)
 696                 goto err;
 697
 698         usb_fill_int_urb(hif_dev->reg_in_urb, hif_dev->udev,
 699                          usb_rcvintpipe(hif_dev->udev, USB_REG_IN_PIPE),
 700                          skb->data, MAX_REG_IN_BUF_SIZE,
 701                          ath9k_hif_usb_reg_in_cb, skb, 1);
 702
 703         if (usb_submit_urb(hif_dev->reg_in_urb, GFP_KERNEL) != 0)
 704                 goto err;
 705
 706         return 0;
 707
 708 err:
 709         ath9k_hif_usb_dealloc_reg_in_urb(hif_dev);
 710         return -ENOMEM;
 711 }
 712
 713 static int ath9k_hif_usb_alloc_urbs(struct hif_device_usb *hif_dev)
 714 {
 715         /* Register Write */
 716         init_usb_anchor(&hif_dev->regout_submitted);
 717
 718         /* TX */
 719         if (ath9k_hif_usb_alloc_tx_urbs(hif_dev) < 0)
 720                 goto err;
 721
 722         /* RX */
 723         if (ath9k_hif_usb_alloc_rx_urbs(hif_dev) < 0)
 724                 goto err;
 725
 726         /* Register Read */
 727         if (ath9k_hif_usb_alloc_reg_in_urb(hif_dev) < 0)
 728                 goto err;
 729
 730         return 0;
 731 err:
 732         return -ENOMEM;
 733 }
 734
 735 static int ath9k_hif_usb_download_fw(struct hif_device_usb *hif_dev)
 736 {
 737         int transfer, err;
 738         const void *data = hif_dev->firmware->data;
 739         size_t len = hif_dev->firmware->size;
 740         u32 addr = AR9271_FIRMWARE;
 741         u8 *buf = kzalloc(4096, GFP_KERNEL);
 742
 743         if (!buf)
 744                 return -ENOMEM;
 745
 746         while (len) {
 747                 transfer = min_t(int, len, 4096);
 748                 memcpy(buf, data, transfer);
 749
 750                 err = usb_control_msg(hif_dev->udev,
 751                                       usb_sndctrlpipe(hif_dev->udev, 0),
 752                                       FIRMWARE_DOWNLOAD, 0x40 | USB_DIR_OUT,
 753                                       addr >> 8, 0, buf, transfer, HZ);
 754                 if (err < 0) {
 755                         kfree(buf);
 756                         return err;
 757                 }
 758
 759                 len -= transfer;
 760                 data += transfer;
 761                 addr += transfer;
 762         }
 763         kfree(buf);
 764
 765         /*
 766          * Issue FW download complete command to firmware.
 767          */
 768         err = usb_control_msg(hif_dev->udev, usb_sndctrlpipe(hif_dev->udev, 0),
 769                               FIRMWARE_DOWNLOAD_COMP,
 770                               0x40 | USB_DIR_OUT,
 771                               AR9271_FIRMWARE_TEXT >> 8, 0, NULL, 0, HZ);
 772         if (err)
 773                 return -EIO;
 774
 775         dev_info(&hif_dev->udev->dev, "ath9k_htc: Transferred FW: %s, size: %ld\n",
 776                  "ar9271.fw", (unsigned long) hif_dev->firmware->size);
 777
 778         return 0;
 779 }
 780
 781 static int ath9k_hif_usb_dev_init(struct hif_device_usb *hif_dev,
 782                                   const char *fw_name)
 783 {
 784         int ret;
 785
 786         /* Request firmware */
 787         ret = request_firmware(&hif_dev->firmware, fw_name, &hif_dev->udev->dev);
 788         if (ret) {
 789                 dev_err(&hif_dev->udev->dev,
 790                         "ath9k_htc: Firmware - %s not found\n", fw_name);
 791                 goto err_fw_req;
 792         }
 793
 794         /* Download firmware */
 795         ret = ath9k_hif_usb_download_fw(hif_dev);
 796         if (ret) {
 797                 dev_err(&hif_dev->udev->dev,
 798                         "ath9k_htc: Firmware - %s download failed\n", fw_name);
 799                 goto err_fw_download;
 800         }
 801
 802         /* Alloc URBs */
 803         ret = ath9k_hif_usb_alloc_urbs(hif_dev);
 804         if (ret) {
 805                 dev_err(&hif_dev->udev->dev,
 806                         "ath9k_htc: Unable to allocate URBs\n");
 807                 goto err_urb;
 808         }
 809
 810         return 0;
 811
 812 err_urb:
 813         /* Nothing */
 814 err_fw_download:
 815         release_firmware(hif_dev->firmware);
 816 err_fw_req:
 817         hif_dev->firmware = NULL;
 818         return ret;
 819 }
 820
 821 static void ath9k_hif_usb_dealloc_urbs(struct hif_device_usb *hif_dev)
 822 {
 823         usb_kill_anchored_urbs(&hif_dev->regout_submitted);
 824         ath9k_hif_usb_dealloc_reg_in_urb(hif_dev);
 825         ath9k_hif_usb_dealloc_tx_urbs(hif_dev);
 826         ath9k_hif_usb_dealloc_rx_urbs(hif_dev);
 827 }
 828
 829 static void ath9k_hif_usb_dev_deinit(struct hif_device_usb *hif_dev)
 830 {
 831         ath9k_hif_usb_dealloc_urbs(hif_dev);
 832         if (hif_dev->firmware)
 833                 release_firmware(hif_dev->firmware);
 834 }
 835
 836 static int ath9k_hif_usb_probe(struct usb_interface *interface,
 837                                const struct usb_device_id *id)
 838 {
 839         struct usb_device *udev = interface_to_usbdev(interface);
 840         struct hif_device_usb *hif_dev;
 841         const char *fw_name = (const char *) id->driver_info;
 842         int ret = 0;
 843
 844         hif_dev = kzalloc(sizeof(struct hif_device_usb), GFP_KERNEL);
 845         if (!hif_dev) {
 846                 ret = -ENOMEM;
 847                 goto err_alloc;
 848         }
 849
 850         usb_get_dev(udev);
 851         hif_dev->udev = udev;
 852         hif_dev->interface = interface;
 853         hif_dev->device_id = id->idProduct;
 854 #ifdef CONFIG_PM
 855         udev->reset_resume = 1;
 856 #endif
 857         usb_set_intfdata(interface, hif_dev);
 858
 859         ret = ath9k_hif_usb_dev_init(hif_dev, fw_name);
 860         if (ret) {
 861                 ret = -EINVAL;
 862                 goto err_hif_init_usb;
 863         }
 864
 865         hif_dev->htc_handle = ath9k_htc_hw_alloc(hif_dev);
 866         if (hif_dev->htc_handle == NULL) {
 867                 ret = -ENOMEM;
 868                 goto err_htc_hw_alloc;
 869         }
 870
 871         ret = ath9k_htc_hw_init(&hif_usb, hif_dev->htc_handle, hif_dev,
 872                                 &hif_dev->udev->dev, hif_dev->device_id,
 873                                 ATH9K_HIF_USB);
 874         if (ret) {
 875                 ret = -EINVAL;
 876                 goto err_htc_hw_init;
 877         }
 878
 879         dev_info(&hif_dev->udev->dev, "ath9k_htc: USB layer initialized\n");
 880
 881         return 0;
 882
 883 err_htc_hw_init:
 884         ath9k_htc_hw_free(hif_dev->htc_handle);
 885 err_htc_hw_alloc:
 886         ath9k_hif_usb_dev_deinit(hif_dev);
 887 err_hif_init_usb:
 888         usb_set_intfdata(interface, NULL);
 889         kfree(hif_dev);
 890         usb_put_dev(udev);
 891 err_alloc:
 892         return ret;
 893 }
 894
 895 static void ath9k_hif_usb_disconnect(struct usb_interface *interface)
 896 {
 897         struct usb_device *udev = interface_to_usbdev(interface);
 898         struct hif_device_usb *hif_dev =
 899                 (struct hif_device_usb *) usb_get_intfdata(interface);
 900
 901         if (hif_dev) {
 902                 ath9k_htc_hw_deinit(hif_dev->htc_handle, true);
 903                 ath9k_htc_hw_free(hif_dev->htc_handle);
 904                 ath9k_hif_usb_dev_deinit(hif_dev);
 905                 usb_set_intfdata(interface, NULL);
 906         }
 907
 908         if (hif_dev->flags & HIF_USB_START)
 909                 usb_reset_device(udev);
 910
 911         kfree(hif_dev);
 912         dev_info(&udev->dev, "ath9k_htc: USB layer deinitialized\n");
 913         usb_put_dev(udev);
 914 }
 915
 916 #ifdef CONFIG_PM
 917 static int ath9k_hif_usb_suspend(struct usb_interface *interface,
 918                                  pm_message_t message)
 919 {
 920         struct hif_device_usb *hif_dev =
 921                 (struct hif_device_usb *) usb_get_intfdata(interface);
 922
 923         ath9k_hif_usb_dealloc_urbs(hif_dev);
 924
 925         return 0;
 926 }
 927
 928 static int ath9k_hif_usb_resume(struct usb_interface *interface)
 929 {
 930         struct hif_device_usb *hif_dev =
 931                 (struct hif_device_usb *) usb_get_intfdata(interface);
 932         int ret;
 933
 934         ret = ath9k_hif_usb_alloc_urbs(hif_dev);
 935         if (ret)
 936                 return ret;
 937
 938         if (hif_dev->firmware) {
 939                 ret = ath9k_hif_usb_download_fw(hif_dev);
 940                 if (ret)
 941                         goto fail_resume;
 942         } else {
 943                 ath9k_hif_usb_dealloc_urbs(hif_dev);
 944                 return -EIO;
 945         }
 946
 947         mdelay(100);
 948
 949         ret = ath9k_htc_resume(hif_dev->htc_handle);
 950
 951         if (ret)
 952                 goto fail_resume;
 953
 954         return 0;
 955
 956 fail_resume:
 957         ath9k_hif_usb_dealloc_urbs(hif_dev);
 958
 959         return ret;
 960 }
 961 #endif
 962
 963 static struct usb_driver ath9k_hif_usb_driver = {
 964         .name = "ath9k_hif_usb",
 965         .probe = ath9k_hif_usb_probe,
 966         .disconnect = ath9k_hif_usb_disconnect,
 967 #ifdef CONFIG_PM
 968         .suspend = ath9k_hif_usb_suspend,
 969         .resume = ath9k_hif_usb_resume,
 970         .reset_resume = ath9k_hif_usb_resume,
 971 #endif
 972         .id_table = ath9k_hif_usb_ids,
 973         .soft_unbind = 1,
 974 };
 975
 976 int ath9k_hif_usb_init(void)
 977 {
 978         return usb_register(&ath9k_hif_usb_driver);
 979 }
 980
 981 void ath9k_hif_usb_exit(void)
 982 {
 983         usb_deregister(&ath9k_hif_usb_driver);
 984 }