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 static struct usb_device_id ath9k_hif_usb_ids[] = {
  20         { USB_DEVICE(0x0cf3, 0x9271) },
  21         { USB_DEVICE(0x0cf3, 0x1006) },
  22         { USB_DEVICE(0x0cf3, 0x7010) },
  23         { },
  24 };
  25
  26 MODULE_DEVICE_TABLE(usb, ath9k_hif_usb_ids);
  27
  28 static int __hif_usb_tx(struct hif_device_usb *hif_dev);
  29
  30 static void hif_usb_regout_cb(struct urb *urb)
  31 {
  32         struct cmd_buf *cmd = (struct cmd_buf *)urb->context;
  33
  34         switch (urb->status) {
  35         case 0:
  36                 break;
  37         case -ENOENT:
  38         case -ECONNRESET:
  39         case -ENODEV:
  40         case -ESHUTDOWN:
  41                 goto free;
  42         default:
  43                 break;
  44         }
  45
  46         if (cmd) {
  47                 ath9k_htc_txcompletion_cb(cmd->hif_dev->htc_handle,
  48                                           cmd->skb, 1);
  49                 kfree(cmd);
  50         }
  51
  52         return;
  53 free:
  54         kfree_skb(cmd->skb);
  55         kfree(cmd);
  56 }
  57
  58 static int hif_usb_send_regout(struct hif_device_usb *hif_dev,
  59                                struct sk_buff *skb)
  60 {
  61         struct urb *urb;
  62         struct cmd_buf *cmd;
  63         int ret = 0;
  64
  65         urb = usb_alloc_urb(0, GFP_KERNEL);
  66         if (urb == NULL)
  67                 return -ENOMEM;
  68
  69         cmd = kzalloc(sizeof(*cmd), GFP_KERNEL);
  70         if (cmd == NULL) {
  71                 usb_free_urb(urb);
  72                 return -ENOMEM;
  73         }
  74
  75         cmd->skb = skb;
  76         cmd->hif_dev = hif_dev;
  77
  78         usb_fill_int_urb(urb, hif_dev->udev,
  79                          usb_sndintpipe(hif_dev->udev, USB_REG_OUT_PIPE),
  80                          skb->data, skb->len,
  81                          hif_usb_regout_cb, cmd, 1);
  82
  83         usb_anchor_urb(urb, &hif_dev->regout_submitted);
  84         ret = usb_submit_urb(urb, GFP_KERNEL);
  85         if (ret) {
  86                 usb_unanchor_urb(urb);
  87                 kfree(cmd);
  88         }
  89         usb_free_urb(urb);
  90
  91         return ret;
  92 }
  93
  94 static inline void ath9k_skb_queue_purge(struct hif_device_usb *hif_dev,
  95                                          struct sk_buff_head *list)
  96 {
  97         struct sk_buff *skb;
  98
  99         while ((skb = __skb_dequeue(list)) != NULL) {
 100                 dev_kfree_skb_any(skb);
 101                 TX_STAT_INC(skb_dropped);
 102         }
 103 }
 104
 105 static void hif_usb_tx_cb(struct urb *urb)
 106 {
 107         struct tx_buf *tx_buf = (struct tx_buf *) urb->context;
 108         struct hif_device_usb *hif_dev;
 109         struct sk_buff *skb;
 110
 111         if (!tx_buf || !tx_buf->hif_dev)
 112                 return;
 113
 114         hif_dev = tx_buf->hif_dev;
 115
 116         switch (urb->status) {
 117         case 0:
 118                 break;
 119         case -ENOENT:
 120         case -ECONNRESET:
 121         case -ENODEV:
 122         case -ESHUTDOWN:
 123                 /*
 124                  * The URB has been killed, free the SKBs
 125                  * and return.
 126                  */
 127                 ath9k_skb_queue_purge(hif_dev, &tx_buf->skb_queue);
 128                 return;
 129         default:
 130                 break;
 131         }
 132
 133         /* Check if TX has been stopped */
 134         spin_lock(&hif_dev->tx.tx_lock);
 135         if (hif_dev->tx.flags & HIF_USB_TX_STOP) {
 136                 spin_unlock(&hif_dev->tx.tx_lock);
 137                 ath9k_skb_queue_purge(hif_dev, &tx_buf->skb_queue);
 138                 goto add_free;
 139         }
 140         spin_unlock(&hif_dev->tx.tx_lock);
 141
 142         /* Complete the queued SKBs. */
 143         while ((skb = __skb_dequeue(&tx_buf->skb_queue)) != NULL) {
 144                 ath9k_htc_txcompletion_cb(hif_dev->htc_handle,
 145                                           skb, 1);
 146                 TX_STAT_INC(skb_completed);
 147         }
 148
 149 add_free:
 150         /* Re-initialize the SKB queue */
 151         tx_buf->len = tx_buf->offset = 0;
 152         __skb_queue_head_init(&tx_buf->skb_queue);
 153
 154         /* Add this TX buffer to the free list */
 155         spin_lock(&hif_dev->tx.tx_lock);
 156         list_move_tail(&tx_buf->list, &hif_dev->tx.tx_buf);
 157         hif_dev->tx.tx_buf_cnt++;
 158         if (!(hif_dev->tx.flags & HIF_USB_TX_STOP))
 159                 __hif_usb_tx(hif_dev); /* Check for pending SKBs */
 160         TX_STAT_INC(buf_completed);
 161         spin_unlock(&hif_dev->tx.tx_lock);
 162 }
 163
 164 /* TX lock has to be taken */
 165 static int __hif_usb_tx(struct hif_device_usb *hif_dev)
 166 {
 167         struct tx_buf *tx_buf = NULL;
 168         struct sk_buff *nskb = NULL;
 169         int ret = 0, i;
 170         u16 *hdr, tx_skb_cnt = 0;
 171         u8 *buf;
 172
 173         if (hif_dev->tx.tx_skb_cnt == 0)
 174                 return 0;
 175
 176         /* Check if a free TX buffer is available */
 177         if (list_empty(&hif_dev->tx.tx_buf))
 178                 return 0;
 179
 180         tx_buf = list_first_entry(&hif_dev->tx.tx_buf, struct tx_buf, list);
 181         list_move_tail(&tx_buf->list, &hif_dev->tx.tx_pending);
 182         hif_dev->tx.tx_buf_cnt--;
 183
 184         tx_skb_cnt = min_t(u16, hif_dev->tx.tx_skb_cnt, MAX_TX_AGGR_NUM);
 185
 186         for (i = 0; i < tx_skb_cnt; i++) {
 187                 nskb = __skb_dequeue(&hif_dev->tx.tx_skb_queue);
 188
 189                 /* Should never be NULL */
 190                 BUG_ON(!nskb);
 191
 192                 hif_dev->tx.tx_skb_cnt--;
 193
 194                 buf = tx_buf->buf;
 195                 buf += tx_buf->offset;
 196                 hdr = (u16 *)buf;
 197                 *hdr++ = nskb->len;
 198                 *hdr++ = ATH_USB_TX_STREAM_MODE_TAG;
 199                 buf += 4;
 200                 memcpy(buf, nskb->data, nskb->len);
 201                 tx_buf->len = nskb->len + 4;
 202
 203                 if (i < (tx_skb_cnt - 1))
 204                         tx_buf->offset += (((tx_buf->len - 1) / 4) + 1) * 4;
 205
 206                 if (i == (tx_skb_cnt - 1))
 207                         tx_buf->len += tx_buf->offset;
 208
 209                 __skb_queue_tail(&tx_buf->skb_queue, nskb);
 210                 TX_STAT_INC(skb_queued);
 211         }
 212
 213         usb_fill_bulk_urb(tx_buf->urb, hif_dev->udev,
 214                           usb_sndbulkpipe(hif_dev->udev, USB_WLAN_TX_PIPE),
 215                           tx_buf->buf, tx_buf->len,
 216                           hif_usb_tx_cb, tx_buf);
 217
 218         ret = usb_submit_urb(tx_buf->urb, GFP_ATOMIC);
 219         if (ret) {
 220                 tx_buf->len = tx_buf->offset = 0;
 221                 ath9k_skb_queue_purge(hif_dev, &tx_buf->skb_queue);
 222                 __skb_queue_head_init(&tx_buf->skb_queue);
 223                 list_move_tail(&tx_buf->list, &hif_dev->tx.tx_buf);
 224                 hif_dev->tx.tx_buf_cnt++;
 225         }
 226
 227         if (!ret)
 228                 TX_STAT_INC(buf_queued);
 229
 230         return ret;
 231 }
 232
 233 static int hif_usb_send_tx(struct hif_device_usb *hif_dev, struct sk_buff *skb,
 234                            struct ath9k_htc_tx_ctl *tx_ctl)
 235 {
 236         unsigned long flags;
 237
 238         spin_lock_irqsave(&hif_dev->tx.tx_lock, flags);
 239
 240         if (hif_dev->tx.flags & HIF_USB_TX_STOP) {
 241                 spin_unlock_irqrestore(&hif_dev->tx.tx_lock, flags);
 242                 return -ENODEV;
 243         }
 244
 245         /* Check if the max queue count has been reached */
 246         if (hif_dev->tx.tx_skb_cnt > MAX_TX_BUF_NUM) {
 247                 spin_unlock_irqrestore(&hif_dev->tx.tx_lock, flags);
 248                 return -ENOMEM;
 249         }
 250
 251         __skb_queue_tail(&hif_dev->tx.tx_skb_queue, skb);
 252         hif_dev->tx.tx_skb_cnt++;
 253
 254         /* Send normal frames immediately */
 255         if (!tx_ctl || (tx_ctl && (tx_ctl->type == ATH9K_HTC_NORMAL)))
 256                 __hif_usb_tx(hif_dev);
 257
 258         /* Check if AMPDUs have to be sent immediately */
 259         if (tx_ctl && (tx_ctl->type == ATH9K_HTC_AMPDU) &&
 260             (hif_dev->tx.tx_buf_cnt == MAX_TX_URB_NUM) &&
 261             (hif_dev->tx.tx_skb_cnt < 2)) {
 262                 __hif_usb_tx(hif_dev);
 263         }
 264
 265         spin_unlock_irqrestore(&hif_dev->tx.tx_lock, flags);
 266
 267         return 0;
 268 }
 269
 270 static void hif_usb_start(void *hif_handle, u8 pipe_id)
 271 {
 272         struct hif_device_usb *hif_dev = (struct hif_device_usb *)hif_handle;
 273         unsigned long flags;
 274
 275         hif_dev->flags |= HIF_USB_START;
 276
 277         spin_lock_irqsave(&hif_dev->tx.tx_lock, flags);
 278         hif_dev->tx.flags &= ~HIF_USB_TX_STOP;
 279         spin_unlock_irqrestore(&hif_dev->tx.tx_lock, flags);
 280 }
 281
 282 static void hif_usb_stop(void *hif_handle, u8 pipe_id)
 283 {
 284         struct hif_device_usb *hif_dev = (struct hif_device_usb *)hif_handle;
 285         unsigned long flags;
 286
 287         spin_lock_irqsave(&hif_dev->tx.tx_lock, flags);
 288         ath9k_skb_queue_purge(hif_dev, &hif_dev->tx.tx_skb_queue);
 289         hif_dev->tx.tx_skb_cnt = 0;
 290         hif_dev->tx.flags |= HIF_USB_TX_STOP;
 291         spin_unlock_irqrestore(&hif_dev->tx.tx_lock, flags);
 292 }
 293
 294 static int hif_usb_send(void *hif_handle, u8 pipe_id, struct sk_buff *skb,
 295                         struct ath9k_htc_tx_ctl *tx_ctl)
 296 {
 297         struct hif_device_usb *hif_dev = (struct hif_device_usb *)hif_handle;
 298         int ret = 0;
 299
 300         switch (pipe_id) {
 301         case USB_WLAN_TX_PIPE:
 302                 ret = hif_usb_send_tx(hif_dev, skb, tx_ctl);
 303                 break;
 304         case USB_REG_OUT_PIPE:
 305                 ret = hif_usb_send_regout(hif_dev, skb);
 306                 break;
 307         default:
 308                 dev_err(&hif_dev->udev->dev,
 309                         "ath9k_htc: Invalid TX pipe: %d\n", pipe_id);
 310                 ret = -EINVAL;
 311                 break;
 312         }
 313
 314         return ret;
 315 }
 316
 317 static struct ath9k_htc_hif hif_usb = {
 318         .transport = ATH9K_HIF_USB,
 319         .name = "ath9k_hif_usb",
 320
 321         .control_ul_pipe = USB_REG_OUT_PIPE,
 322         .control_dl_pipe = USB_REG_IN_PIPE,
 323
 324         .start = hif_usb_start,
 325         .stop = hif_usb_stop,
 326         .send = hif_usb_send,
 327 };
 328
 329 static void ath9k_hif_usb_rx_stream(struct hif_device_usb *hif_dev,
 330                                     struct sk_buff *skb)
 331 {
 332         struct sk_buff *nskb, *skb_pool[MAX_PKT_NUM_IN_TRANSFER];
 333         int index = 0, i = 0, chk_idx, len = skb->len;
 334         int rx_remain_len = 0, rx_pkt_len = 0;
 335         u16 pkt_len, pkt_tag, pool_index = 0;
 336         u8 *ptr;
 337
 338         spin_lock(&hif_dev->rx_lock);
 339
 340         rx_remain_len = hif_dev->rx_remain_len;
 341         rx_pkt_len = hif_dev->rx_transfer_len;
 342
 343         if (rx_remain_len != 0) {
 344                 struct sk_buff *remain_skb = hif_dev->remain_skb;
 345
 346                 if (remain_skb) {
 347                         ptr = (u8 *) remain_skb->data;
 348
 349                         index = rx_remain_len;
 350                         rx_remain_len -= hif_dev->rx_pad_len;
 351                         ptr += rx_pkt_len;
 352
 353                         memcpy(ptr, skb->data, rx_remain_len);
 354
 355                         rx_pkt_len += rx_remain_len;
 356                         hif_dev->rx_remain_len = 0;
 357                         skb_put(remain_skb, rx_pkt_len);
 358
 359                         skb_pool[pool_index++] = remain_skb;
 360
 361                 } else {
 362                         index = rx_remain_len;
 363                 }
 364         }
 365
 366         spin_unlock(&hif_dev->rx_lock);
 367
 368         while (index < len) {
 369                 ptr = (u8 *) skb->data;
 370
 371                 pkt_len = ptr[index] + (ptr[index+1] << 8);
 372                 pkt_tag = ptr[index+2] + (ptr[index+3] << 8);
 373
 374                 if (pkt_tag == ATH_USB_RX_STREAM_MODE_TAG) {
 375                         u16 pad_len;
 376
 377                         pad_len = 4 - (pkt_len & 0x3);
 378                         if (pad_len == 4)
 379                                 pad_len = 0;
 380
 381                         chk_idx = index;
 382                         index = index + 4 + pkt_len + pad_len;
 383
 384                         if (index > MAX_RX_BUF_SIZE) {
 385                                 spin_lock(&hif_dev->rx_lock);
 386                                 hif_dev->rx_remain_len = index - MAX_RX_BUF_SIZE;
 387                                 hif_dev->rx_transfer_len =
 388                                         MAX_RX_BUF_SIZE - chk_idx - 4;
 389                                 hif_dev->rx_pad_len = pad_len;
 390
 391                                 nskb = __dev_alloc_skb(pkt_len + 32,
 392                                                        GFP_ATOMIC);
 393                                 if (!nskb) {
 394                                         dev_err(&hif_dev->udev->dev,
 395                                         "ath9k_htc: RX memory allocation"
 396                                         " error\n");
 397                                         spin_unlock(&hif_dev->rx_lock);
 398                                         goto err;
 399                                 }
 400                                 skb_reserve(nskb, 32);
 401                                 RX_STAT_INC(skb_allocated);
 402
 403                                 memcpy(nskb->data, &(skb->data[chk_idx+4]),
 404                                        hif_dev->rx_transfer_len);
 405
 406                                 /* Record the buffer pointer */
 407                                 hif_dev->remain_skb = nskb;
 408                                 spin_unlock(&hif_dev->rx_lock);
 409                         } else {
 410                                 nskb = __dev_alloc_skb(pkt_len + 32, GFP_ATOMIC);
 411                                 if (!nskb) {
 412                                         dev_err(&hif_dev->udev->dev,
 413                                         "ath9k_htc: RX memory allocation"
 414                                         " error\n");
 415                                         goto err;
 416                                 }
 417                                 skb_reserve(nskb, 32);
 418                                 RX_STAT_INC(skb_allocated);
 419
 420                                 memcpy(nskb->data, &(skb->data[chk_idx+4]), pkt_len);
 421                                 skb_put(nskb, pkt_len);
 422                                 skb_pool[pool_index++] = nskb;
 423                         }
 424                 } else {
 425                         RX_STAT_INC(skb_dropped);
 426                         return;
 427                 }
 428         }
 429
 430 err:
 431         for (i = 0; i < pool_index; i++) {
 432                 ath9k_htc_rx_msg(hif_dev->htc_handle, skb_pool[i],
 433                                  skb_pool[i]->len, USB_WLAN_RX_PIPE);
 434                 RX_STAT_INC(skb_completed);
 435         }
 436 }
 437
 438 static void ath9k_hif_usb_rx_cb(struct urb *urb)
 439 {
 440         struct sk_buff *skb = (struct sk_buff *) urb->context;
 441         struct hif_device_usb *hif_dev = (struct hif_device_usb *)
 442                 usb_get_intfdata(usb_ifnum_to_if(urb->dev, 0));
 443         int ret;
 444
 445         if (!skb)
 446                 return;
 447
 448         if (!hif_dev)
 449                 goto free;
 450
 451         switch (urb->status) {
 452         case 0:
 453                 break;
 454         case -ENOENT:
 455         case -ECONNRESET:
 456         case -ENODEV:
 457         case -ESHUTDOWN:
 458                 goto free;
 459         default:
 460                 goto resubmit;
 461         }
 462
 463         if (likely(urb->actual_length != 0)) {
 464                 skb_put(skb, urb->actual_length);
 465                 ath9k_hif_usb_rx_stream(hif_dev, skb);
 466         }
 467
 468 resubmit:
 469         skb_reset_tail_pointer(skb);
 470         skb_trim(skb, 0);
 471
 472         usb_anchor_urb(urb, &hif_dev->rx_submitted);
 473         ret = usb_submit_urb(urb, GFP_ATOMIC);
 474         if (ret) {
 475                 usb_unanchor_urb(urb);
 476                 goto free;
 477         }
 478
 479         return;
 480 free:
 481         kfree_skb(skb);
 482 }
 483
 484 static void ath9k_hif_usb_reg_in_cb(struct urb *urb)
 485 {
 486         struct sk_buff *skb = (struct sk_buff *) urb->context;
 487         struct sk_buff *nskb;
 488         struct hif_device_usb *hif_dev = (struct hif_device_usb *)
 489                 usb_get_intfdata(usb_ifnum_to_if(urb->dev, 0));
 490         int ret;
 491
 492         if (!skb)
 493                 return;
 494
 495         if (!hif_dev)
 496                 goto free;
 497
 498         switch (urb->status) {
 499         case 0:
 500                 break;
 501         case -ENOENT:
 502         case -ECONNRESET:
 503         case -ENODEV:
 504         case -ESHUTDOWN:
 505                 goto free;
 506         default:
 507                 goto resubmit;
 508         }
 509
 510         if (likely(urb->actual_length != 0)) {
 511                 skb_put(skb, urb->actual_length);
 512
 513                 /* Process the command first */
 514                 ath9k_htc_rx_msg(hif_dev->htc_handle, skb,
 515                                  skb->len, USB_REG_IN_PIPE);
 516
 517
 518                 nskb = alloc_skb(MAX_REG_IN_BUF_SIZE, GFP_ATOMIC);
 519                 if (!nskb) {
 520                         dev_err(&hif_dev->udev->dev,
 521                                 "ath9k_htc: REG_IN memory allocation failure\n");
 522                         urb->context = NULL;
 523                         return;
 524                 }
 525
 526                 usb_fill_int_urb(urb, hif_dev->udev,
 527                                  usb_rcvintpipe(hif_dev->udev, USB_REG_IN_PIPE),
 528                                  nskb->data, MAX_REG_IN_BUF_SIZE,
 529                                  ath9k_hif_usb_reg_in_cb, nskb, 1);
 530
 531                 ret = usb_submit_urb(urb, GFP_ATOMIC);
 532                 if (ret) {
 533                         kfree_skb(nskb);
 534                         urb->context = NULL;
 535                 }
 536
 537                 return;
 538         }
 539
 540 resubmit:
 541         skb_reset_tail_pointer(skb);
 542         skb_trim(skb, 0);
 543
 544         ret = usb_submit_urb(urb, GFP_ATOMIC);
 545         if (ret)
 546                 goto free;
 547
 548         return;
 549 free:
 550         kfree_skb(skb);
 551         urb->context = NULL;
 552 }
 553
 554 static void ath9k_hif_usb_dealloc_tx_urbs(struct hif_device_usb *hif_dev)
 555 {
 556         struct tx_buf *tx_buf = NULL, *tx_buf_tmp = NULL;
 557
 558         list_for_each_entry_safe(tx_buf, tx_buf_tmp,
 559                                  &hif_dev->tx.tx_buf, list) {
 560                 usb_kill_urb(tx_buf->urb);
 561                 list_del(&tx_buf->list);
 562                 usb_free_urb(tx_buf->urb);
 563                 kfree(tx_buf->buf);
 564                 kfree(tx_buf);
 565         }
 566
 567         list_for_each_entry_safe(tx_buf, tx_buf_tmp,
 568                                  &hif_dev->tx.tx_pending, list) {
 569                 usb_kill_urb(tx_buf->urb);
 570                 list_del(&tx_buf->list);
 571                 usb_free_urb(tx_buf->urb);
 572                 kfree(tx_buf->buf);
 573                 kfree(tx_buf);
 574         }
 575 }
 576
 577 static int ath9k_hif_usb_alloc_tx_urbs(struct hif_device_usb *hif_dev)
 578 {
 579         struct tx_buf *tx_buf;
 580         int i;
 581
 582         INIT_LIST_HEAD(&hif_dev->tx.tx_buf);
 583         INIT_LIST_HEAD(&hif_dev->tx.tx_pending);
 584         spin_lock_init(&hif_dev->tx.tx_lock);
 585         __skb_queue_head_init(&hif_dev->tx.tx_skb_queue);
 586
 587         for (i = 0; i < MAX_TX_URB_NUM; i++) {
 588                 tx_buf = kzalloc(sizeof(struct tx_buf), GFP_KERNEL);
 589                 if (!tx_buf)
 590                         goto err;
 591
 592                 tx_buf->buf = kzalloc(MAX_TX_BUF_SIZE, GFP_KERNEL);
 593                 if (!tx_buf->buf)
 594                         goto err;
 595
 596                 tx_buf->urb = usb_alloc_urb(0, GFP_KERNEL);
 597                 if (!tx_buf->urb)
 598                         goto err;
 599
 600                 tx_buf->hif_dev = hif_dev;
 601                 __skb_queue_head_init(&tx_buf->skb_queue);
 602
 603                 list_add_tail(&tx_buf->list, &hif_dev->tx.tx_buf);
 604         }
 605
 606         hif_dev->tx.tx_buf_cnt = MAX_TX_URB_NUM;
 607
 608         return 0;
 609 err:
 610         if (tx_buf) {
 611                 kfree(tx_buf->buf);
 612                 kfree(tx_buf);
 613         }
 614         ath9k_hif_usb_dealloc_tx_urbs(hif_dev);
 615         return -ENOMEM;
 616 }
 617
 618 static void ath9k_hif_usb_dealloc_rx_urbs(struct hif_device_usb *hif_dev)
 619 {
 620         usb_kill_anchored_urbs(&hif_dev->rx_submitted);
 621 }
 622
 623 static int ath9k_hif_usb_alloc_rx_urbs(struct hif_device_usb *hif_dev)
 624 {
 625         struct urb *urb = NULL;
 626         struct sk_buff *skb = NULL;
 627         int i, ret;
 628
 629         init_usb_anchor(&hif_dev->rx_submitted);
 630         spin_lock_init(&hif_dev->rx_lock);
 631
 632         for (i = 0; i < MAX_RX_URB_NUM; i++) {
 633
 634                 /* Allocate URB */
 635                 urb = usb_alloc_urb(0, GFP_KERNEL);
 636                 if (urb == NULL) {
 637                         ret = -ENOMEM;
 638                         goto err_urb;
 639                 }
 640
 641                 /* Allocate buffer */
 642                 skb = alloc_skb(MAX_RX_BUF_SIZE, GFP_KERNEL);
 643                 if (!skb) {
 644                         ret = -ENOMEM;
 645                         goto err_skb;
 646                 }
 647
 648                 usb_fill_bulk_urb(urb, hif_dev->udev,
 649                                   usb_rcvbulkpipe(hif_dev->udev,
 650                                                   USB_WLAN_RX_PIPE),
 651                                   skb->data, MAX_RX_BUF_SIZE,
 652                                   ath9k_hif_usb_rx_cb, skb);
 653
 654                 /* Anchor URB */
 655                 usb_anchor_urb(urb, &hif_dev->rx_submitted);
 656
 657                 /* Submit URB */
 658                 ret = usb_submit_urb(urb, GFP_KERNEL);
 659                 if (ret) {
 660                         usb_unanchor_urb(urb);
 661                         goto err_submit;
 662                 }
 663
 664                 /*
 665                  * Drop reference count.
 666                  * This ensures that the URB is freed when killing them.
 667                  */
 668                 usb_free_urb(urb);
 669         }
 670
 671         return 0;
 672
 673 err_submit:
 674         kfree_skb(skb);
 675 err_skb:
 676         usb_free_urb(urb);
 677 err_urb:
 678         ath9k_hif_usb_dealloc_rx_urbs(hif_dev);
 679         return ret;
 680 }
 681
 682 static void ath9k_hif_usb_dealloc_reg_in_urb(struct hif_device_usb *hif_dev)
 683 {
 684         if (hif_dev->reg_in_urb) {
 685                 usb_kill_urb(hif_dev->reg_in_urb);
 686                 if (hif_dev->reg_in_urb->context)
 687                         kfree_skb((void *)hif_dev->reg_in_urb->context);
 688                 usb_free_urb(hif_dev->reg_in_urb);
 689                 hif_dev->reg_in_urb = NULL;
 690         }
 691 }
 692
 693 static int ath9k_hif_usb_alloc_reg_in_urb(struct hif_device_usb *hif_dev)
 694 {
 695         struct sk_buff *skb;
 696
 697         hif_dev->reg_in_urb = usb_alloc_urb(0, GFP_KERNEL);
 698         if (hif_dev->reg_in_urb == NULL)
 699                 return -ENOMEM;
 700
 701         skb = alloc_skb(MAX_REG_IN_BUF_SIZE, GFP_KERNEL);
 702         if (!skb)
 703                 goto err;
 704
 705         usb_fill_int_urb(hif_dev->reg_in_urb, hif_dev->udev,
 706                          usb_rcvintpipe(hif_dev->udev, USB_REG_IN_PIPE),
 707                          skb->data, MAX_REG_IN_BUF_SIZE,
 708                          ath9k_hif_usb_reg_in_cb, skb, 1);
 709
 710         if (usb_submit_urb(hif_dev->reg_in_urb, GFP_KERNEL) != 0)
 711                 goto err;
 712
 713         return 0;
 714
 715 err:
 716         ath9k_hif_usb_dealloc_reg_in_urb(hif_dev);
 717         return -ENOMEM;
 718 }
 719
 720 static int ath9k_hif_usb_alloc_urbs(struct hif_device_usb *hif_dev)
 721 {
 722         /* Register Write */
 723         init_usb_anchor(&hif_dev->regout_submitted);
 724
 725         /* TX */
 726         if (ath9k_hif_usb_alloc_tx_urbs(hif_dev) < 0)
 727                 goto err;
 728
 729         /* RX */
 730         if (ath9k_hif_usb_alloc_rx_urbs(hif_dev) < 0)
 731                 goto err;
 732
 733         /* Register Read */
 734         if (ath9k_hif_usb_alloc_reg_in_urb(hif_dev) < 0)
 735                 goto err;
 736
 737         return 0;
 738 err:
 739         return -ENOMEM;
 740 }
 741
 742 static void ath9k_hif_usb_dealloc_urbs(struct hif_device_usb *hif_dev)
 743 {
 744         usb_kill_anchored_urbs(&hif_dev->regout_submitted);
 745         ath9k_hif_usb_dealloc_reg_in_urb(hif_dev);
 746         ath9k_hif_usb_dealloc_tx_urbs(hif_dev);
 747         ath9k_hif_usb_dealloc_rx_urbs(hif_dev);
 748 }
 749
 750 static int ath9k_hif_usb_download_fw(struct hif_device_usb *hif_dev)
 751 {
 752         int transfer, err;
 753         const void *data = hif_dev->firmware->data;
 754         size_t len = hif_dev->firmware->size;
 755         u32 addr = AR9271_FIRMWARE;
 756         u8 *buf = kzalloc(4096, GFP_KERNEL);
 757         u32 firm_offset;
 758
 759         if (!buf)
 760                 return -ENOMEM;
 761
 762         while (len) {
 763                 transfer = min_t(int, len, 4096);
 764                 memcpy(buf, data, transfer);
 765
 766                 err = usb_control_msg(hif_dev->udev,
 767                                       usb_sndctrlpipe(hif_dev->udev, 0),
 768                                       FIRMWARE_DOWNLOAD, 0x40 | USB_DIR_OUT,
 769                                       addr >> 8, 0, buf, transfer, HZ);
 770                 if (err < 0) {
 771                         kfree(buf);
 772                         return err;
 773                 }
 774
 775                 len -= transfer;
 776                 data += transfer;
 777                 addr += transfer;
 778         }
 779         kfree(buf);
 780
 781         if (hif_dev->device_id == 0x7010)
 782                 firm_offset = AR7010_FIRMWARE_TEXT;
 783         else
 784                 firm_offset = AR9271_FIRMWARE_TEXT;
 785
 786         /*
 787          * Issue FW download complete command to firmware.
 788          */
 789         err = usb_control_msg(hif_dev->udev, usb_sndctrlpipe(hif_dev->udev, 0),
 790                               FIRMWARE_DOWNLOAD_COMP,
 791                               0x40 | USB_DIR_OUT,
 792                               firm_offset >> 8, 0, NULL, 0, HZ);
 793         if (err)
 794                 return -EIO;
 795
 796         dev_info(&hif_dev->udev->dev, "ath9k_htc: Transferred FW: %s, size: %ld\n",
 797                  hif_dev->fw_name, (unsigned long) hif_dev->firmware->size);
 798
 799         return 0;
 800 }
 801
 802 static int ath9k_hif_usb_dev_init(struct hif_device_usb *hif_dev)
 803 {
 804         int ret;
 805
 806         /* Request firmware */
 807         ret = request_firmware(&hif_dev->firmware, hif_dev->fw_name,
 808                                &hif_dev->udev->dev);
 809         if (ret) {
 810                 dev_err(&hif_dev->udev->dev,
 811                         "ath9k_htc: Firmware - %s not found\n", hif_dev->fw_name);
 812                 goto err_fw_req;
 813         }
 814
 815         /* Alloc URBs */
 816         ret = ath9k_hif_usb_alloc_urbs(hif_dev);
 817         if (ret) {
 818                 dev_err(&hif_dev->udev->dev,
 819                         "ath9k_htc: Unable to allocate URBs\n");
 820                 goto err_urb;
 821         }
 822
 823         /* Download firmware */
 824         ret = ath9k_hif_usb_download_fw(hif_dev);
 825         if (ret) {
 826                 dev_err(&hif_dev->udev->dev,
 827                         "ath9k_htc: Firmware - %s download failed\n",
 828                         hif_dev->fw_name);
 829                 goto err_fw_download;
 830         }
 831
 832         return 0;
 833
 834 err_fw_download:
 835         ath9k_hif_usb_dealloc_urbs(hif_dev);
 836 err_urb:
 837         release_firmware(hif_dev->firmware);
 838 err_fw_req:
 839         hif_dev->firmware = NULL;
 840         return ret;
 841 }
 842
 843 static void ath9k_hif_usb_dev_deinit(struct hif_device_usb *hif_dev)
 844 {
 845         ath9k_hif_usb_dealloc_urbs(hif_dev);
 846         if (hif_dev->firmware)
 847                 release_firmware(hif_dev->firmware);
 848 }
 849
 850 static int ath9k_hif_usb_probe(struct usb_interface *interface,
 851                                const struct usb_device_id *id)
 852 {
 853         struct usb_device *udev = interface_to_usbdev(interface);
 854         struct hif_device_usb *hif_dev;
 855         int ret = 0;
 856
 857         hif_dev = kzalloc(sizeof(struct hif_device_usb), GFP_KERNEL);
 858         if (!hif_dev) {
 859                 ret = -ENOMEM;
 860                 goto err_alloc;
 861         }
 862
 863         usb_get_dev(udev);
 864         hif_dev->udev = udev;
 865         hif_dev->interface = interface;
 866         hif_dev->device_id = id->idProduct;
 867 #ifdef CONFIG_PM
 868         udev->reset_resume = 1;
 869 #endif
 870         usb_set_intfdata(interface, hif_dev);
 871
 872         hif_dev->htc_handle = ath9k_htc_hw_alloc(hif_dev, &hif_usb,
 873                                                  &hif_dev->udev->dev);
 874         if (hif_dev->htc_handle == NULL) {
 875                 ret = -ENOMEM;
 876                 goto err_htc_hw_alloc;
 877         }
 878
 879         /* Find out which firmware to load */
 880
 881         switch(hif_dev->device_id) {
 882         case 0x9271:
 883         case 0x1006:
 884                 hif_dev->fw_name = "ar9271.fw";
 885                 break;
 886         case 0x7010:
 887                 if (le16_to_cpu(udev->descriptor.bcdDevice) == 0x0202)
 888                         hif_dev->fw_name = "ar7010_1_1.fw";
 889                 else
 890                         hif_dev->fw_name = "ar7010.fw";
 891                 break;
 892         default:
 893                 break;
 894         }
 895
 896         if (!hif_dev->fw_name) {
 897                 dev_err(&udev->dev, "Can't determine firmware !\n");
 898                 goto err_htc_hw_alloc;
 899         }
 900
 901         ret = ath9k_hif_usb_dev_init(hif_dev);
 902         if (ret) {
 903                 ret = -EINVAL;
 904                 goto err_hif_init_usb;
 905         }
 906
 907         ret = ath9k_htc_hw_init(hif_dev->htc_handle,
 908                                 &hif_dev->udev->dev, hif_dev->device_id);
 909         if (ret) {
 910                 ret = -EINVAL;
 911                 goto err_htc_hw_init;
 912         }
 913
 914         dev_info(&hif_dev->udev->dev, "ath9k_htc: USB layer initialized\n");
 915
 916         return 0;
 917
 918 err_htc_hw_init:
 919         ath9k_hif_usb_dev_deinit(hif_dev);
 920 err_hif_init_usb:
 921         ath9k_htc_hw_free(hif_dev->htc_handle);
 922 err_htc_hw_alloc:
 923         usb_set_intfdata(interface, NULL);
 924         kfree(hif_dev);
 925         usb_put_dev(udev);
 926 err_alloc:
 927         return ret;
 928 }
 929
 930 static void ath9k_hif_usb_reboot(struct usb_device *udev)
 931 {
 932         u32 reboot_cmd = 0xffffffff;
 933         void *buf;
 934         int ret;
 935
 936         buf = kmemdup(&reboot_cmd, 4, GFP_KERNEL);
 937         if (!buf)
 938                 return;
 939
 940         ret = usb_bulk_msg(udev, usb_sndbulkpipe(udev, USB_REG_OUT_PIPE),
 941                            buf, 4, NULL, HZ);
 942         if (ret)
 943                 dev_err(&udev->dev, "ath9k_htc: USB reboot failed\n");
 944
 945         kfree(buf);
 946 }
 947
 948 static void ath9k_hif_usb_disconnect(struct usb_interface *interface)
 949 {
 950         struct usb_device *udev = interface_to_usbdev(interface);
 951         struct hif_device_usb *hif_dev =
 952                 (struct hif_device_usb *) usb_get_intfdata(interface);
 953
 954         if (hif_dev) {
 955                 ath9k_htc_hw_deinit(hif_dev->htc_handle,
 956                     (udev->state == USB_STATE_NOTATTACHED) ? true : false);
 957                 ath9k_htc_hw_free(hif_dev->htc_handle);
 958                 ath9k_hif_usb_dev_deinit(hif_dev);
 959                 usb_set_intfdata(interface, NULL);
 960         }
 961
 962         if (hif_dev->flags & HIF_USB_START)
 963                 ath9k_hif_usb_reboot(udev);
 964
 965         kfree(hif_dev);
 966         dev_info(&udev->dev, "ath9k_htc: USB layer deinitialized\n");
 967         usb_put_dev(udev);
 968 }
 969
 970 #ifdef CONFIG_PM
 971 static int ath9k_hif_usb_suspend(struct usb_interface *interface,
 972                                  pm_message_t message)
 973 {
 974         struct hif_device_usb *hif_dev =
 975                 (struct hif_device_usb *) usb_get_intfdata(interface);
 976
 977         ath9k_hif_usb_dealloc_urbs(hif_dev);
 978
 979         return 0;
 980 }
 981
 982 static int ath9k_hif_usb_resume(struct usb_interface *interface)
 983 {
 984         struct hif_device_usb *hif_dev =
 985                 (struct hif_device_usb *) usb_get_intfdata(interface);
 986         int ret;
 987
 988         ret = ath9k_hif_usb_alloc_urbs(hif_dev);
 989         if (ret)
 990                 return ret;
 991
 992         if (hif_dev->firmware) {
 993                 ret = ath9k_hif_usb_download_fw(hif_dev);
 994                 if (ret)
 995                         goto fail_resume;
 996         } else {
 997                 ath9k_hif_usb_dealloc_urbs(hif_dev);
 998                 return -EIO;
 999         }
1000
1001         mdelay(100);
1002
1003         ret = ath9k_htc_resume(hif_dev->htc_handle);
1004
1005         if (ret)
1006                 goto fail_resume;
1007
1008         return 0;
1009
1010 fail_resume:
1011         ath9k_hif_usb_dealloc_urbs(hif_dev);
1012
1013         return ret;
1014 }
1015 #endif
1016
1017 static struct usb_driver ath9k_hif_usb_driver = {
1018         .name = "ath9k_hif_usb",
1019         .probe = ath9k_hif_usb_probe,
1020         .disconnect = ath9k_hif_usb_disconnect,
1021 #ifdef CONFIG_PM
1022         .suspend = ath9k_hif_usb_suspend,
1023         .resume = ath9k_hif_usb_resume,
1024         .reset_resume = ath9k_hif_usb_resume,
1025 #endif
1026         .id_table = ath9k_hif_usb_ids,
1027         .soft_unbind = 1,
1028 };
1029
1030 int ath9k_hif_usb_init(void)
1031 {
1032         return usb_register(&ath9k_hif_usb_driver);
1033 }
1034
1035 void ath9k_hif_usb_exit(void)
1036 {
1037         usb_deregister(&ath9k_hif_usb_driver);
1038 }