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 inline void ath9k_skb_queue_purge(struct hif_device_usb *hif_dev,
  97                                          struct sk_buff_head *list)
  98 {
  99         struct sk_buff *skb;
 100
 101         while ((skb = __skb_dequeue(list)) != NULL) {
 102                 dev_kfree_skb_any(skb);
 103                 TX_STAT_INC(skb_dropped);
 104         }
 105 }
 106
 107 static void hif_usb_tx_cb(struct urb *urb)
 108 {
 109         struct tx_buf *tx_buf = (struct tx_buf *) urb->context;
 110         struct hif_device_usb *hif_dev = tx_buf->hif_dev;
 111         struct sk_buff *skb;
 112
 113         if (!hif_dev || !tx_buf)
 114                 return;
 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         ath9k_hif_usb_dealloc_tx_urbs(hif_dev);
 611         return -ENOMEM;
 612 }
 613
 614 static void ath9k_hif_usb_dealloc_rx_urbs(struct hif_device_usb *hif_dev)
 615 {
 616         usb_kill_anchored_urbs(&hif_dev->rx_submitted);
 617 }
 618
 619 static int ath9k_hif_usb_alloc_rx_urbs(struct hif_device_usb *hif_dev)
 620 {
 621         struct urb *urb = NULL;
 622         struct sk_buff *skb = NULL;
 623         int i, ret;
 624
 625         init_usb_anchor(&hif_dev->rx_submitted);
 626         spin_lock_init(&hif_dev->rx_lock);
 627
 628         for (i = 0; i < MAX_RX_URB_NUM; i++) {
 629
 630                 /* Allocate URB */
 631                 urb = usb_alloc_urb(0, GFP_KERNEL);
 632                 if (urb == NULL) {
 633                         ret = -ENOMEM;
 634                         goto err_urb;
 635                 }
 636
 637                 /* Allocate buffer */
 638                 skb = alloc_skb(MAX_RX_BUF_SIZE, GFP_KERNEL);
 639                 if (!skb) {
 640                         ret = -ENOMEM;
 641                         goto err_skb;
 642                 }
 643
 644                 usb_fill_bulk_urb(urb, hif_dev->udev,
 645                                   usb_rcvbulkpipe(hif_dev->udev,
 646                                                   USB_WLAN_RX_PIPE),
 647                                   skb->data, MAX_RX_BUF_SIZE,
 648                                   ath9k_hif_usb_rx_cb, skb);
 649
 650                 /* Anchor URB */
 651                 usb_anchor_urb(urb, &hif_dev->rx_submitted);
 652
 653                 /* Submit URB */
 654                 ret = usb_submit_urb(urb, GFP_KERNEL);
 655                 if (ret) {
 656                         usb_unanchor_urb(urb);
 657                         goto err_submit;
 658                 }
 659
 660                 /*
 661                  * Drop reference count.
 662                  * This ensures that the URB is freed when killing them.
 663                  */
 664                 usb_free_urb(urb);
 665         }
 666
 667         return 0;
 668
 669 err_submit:
 670         kfree_skb(skb);
 671 err_skb:
 672         usb_free_urb(urb);
 673 err_urb:
 674         ath9k_hif_usb_dealloc_rx_urbs(hif_dev);
 675         return ret;
 676 }
 677
 678 static void ath9k_hif_usb_dealloc_reg_in_urb(struct hif_device_usb *hif_dev)
 679 {
 680         if (hif_dev->reg_in_urb) {
 681                 usb_kill_urb(hif_dev->reg_in_urb);
 682                 if (hif_dev->reg_in_urb->context)
 683                         kfree_skb((void *)hif_dev->reg_in_urb->context);
 684                 usb_free_urb(hif_dev->reg_in_urb);
 685                 hif_dev->reg_in_urb = NULL;
 686         }
 687 }
 688
 689 static int ath9k_hif_usb_alloc_reg_in_urb(struct hif_device_usb *hif_dev)
 690 {
 691         struct sk_buff *skb;
 692
 693         hif_dev->reg_in_urb = usb_alloc_urb(0, GFP_KERNEL);
 694         if (hif_dev->reg_in_urb == NULL)
 695                 return -ENOMEM;
 696
 697         skb = alloc_skb(MAX_REG_IN_BUF_SIZE, GFP_KERNEL);
 698         if (!skb)
 699                 goto err;
 700
 701         usb_fill_int_urb(hif_dev->reg_in_urb, hif_dev->udev,
 702                          usb_rcvintpipe(hif_dev->udev, USB_REG_IN_PIPE),
 703                          skb->data, MAX_REG_IN_BUF_SIZE,
 704                          ath9k_hif_usb_reg_in_cb, skb, 1);
 705
 706         if (usb_submit_urb(hif_dev->reg_in_urb, GFP_KERNEL) != 0)
 707                 goto err;
 708
 709         return 0;
 710
 711 err:
 712         ath9k_hif_usb_dealloc_reg_in_urb(hif_dev);
 713         return -ENOMEM;
 714 }
 715
 716 static int ath9k_hif_usb_alloc_urbs(struct hif_device_usb *hif_dev)
 717 {
 718         /* Register Write */
 719         init_usb_anchor(&hif_dev->regout_submitted);
 720
 721         /* TX */
 722         if (ath9k_hif_usb_alloc_tx_urbs(hif_dev) < 0)
 723                 goto err;
 724
 725         /* RX */
 726         if (ath9k_hif_usb_alloc_rx_urbs(hif_dev) < 0)
 727                 goto err;
 728
 729         /* Register Read */
 730         if (ath9k_hif_usb_alloc_reg_in_urb(hif_dev) < 0)
 731                 goto err;
 732
 733         return 0;
 734 err:
 735         return -ENOMEM;
 736 }
 737
 738 static void ath9k_hif_usb_dealloc_urbs(struct hif_device_usb *hif_dev)
 739 {
 740         usb_kill_anchored_urbs(&hif_dev->regout_submitted);
 741         ath9k_hif_usb_dealloc_reg_in_urb(hif_dev);
 742         ath9k_hif_usb_dealloc_tx_urbs(hif_dev);
 743         ath9k_hif_usb_dealloc_rx_urbs(hif_dev);
 744 }
 745
 746 static int ath9k_hif_usb_download_fw(struct hif_device_usb *hif_dev)
 747 {
 748         int transfer, err;
 749         const void *data = hif_dev->firmware->data;
 750         size_t len = hif_dev->firmware->size;
 751         u32 addr = AR9271_FIRMWARE;
 752         u8 *buf = kzalloc(4096, GFP_KERNEL);
 753
 754         if (!buf)
 755                 return -ENOMEM;
 756
 757         while (len) {
 758                 transfer = min_t(int, len, 4096);
 759                 memcpy(buf, data, transfer);
 760
 761                 err = usb_control_msg(hif_dev->udev,
 762                                       usb_sndctrlpipe(hif_dev->udev, 0),
 763                                       FIRMWARE_DOWNLOAD, 0x40 | USB_DIR_OUT,
 764                                       addr >> 8, 0, buf, transfer, HZ);
 765                 if (err < 0) {
 766                         kfree(buf);
 767                         return err;
 768                 }
 769
 770                 len -= transfer;
 771                 data += transfer;
 772                 addr += transfer;
 773         }
 774         kfree(buf);
 775
 776         /*
 777          * Issue FW download complete command to firmware.
 778          */
 779         err = usb_control_msg(hif_dev->udev, usb_sndctrlpipe(hif_dev->udev, 0),
 780                               FIRMWARE_DOWNLOAD_COMP,
 781                               0x40 | USB_DIR_OUT,
 782                               AR9271_FIRMWARE_TEXT >> 8, 0, NULL, 0, HZ);
 783         if (err)
 784                 return -EIO;
 785
 786         dev_info(&hif_dev->udev->dev, "ath9k_htc: Transferred FW: %s, size: %ld\n",
 787                  "ar9271.fw", (unsigned long) hif_dev->firmware->size);
 788
 789         return 0;
 790 }
 791
 792 static int ath9k_hif_usb_dev_init(struct hif_device_usb *hif_dev,
 793                                   const char *fw_name)
 794 {
 795         int ret;
 796
 797         /* Request firmware */
 798         ret = request_firmware(&hif_dev->firmware, fw_name, &hif_dev->udev->dev);
 799         if (ret) {
 800                 dev_err(&hif_dev->udev->dev,
 801                         "ath9k_htc: Firmware - %s not found\n", fw_name);
 802                 goto err_fw_req;
 803         }
 804
 805         /* Alloc URBs */
 806         ret = ath9k_hif_usb_alloc_urbs(hif_dev);
 807         if (ret) {
 808                 dev_err(&hif_dev->udev->dev,
 809                         "ath9k_htc: Unable to allocate URBs\n");
 810                 goto err_urb;
 811         }
 812
 813         /* Download firmware */
 814         ret = ath9k_hif_usb_download_fw(hif_dev);
 815         if (ret) {
 816                 dev_err(&hif_dev->udev->dev,
 817                         "ath9k_htc: Firmware - %s download failed\n", fw_name);
 818                 goto err_fw_download;
 819         }
 820
 821         return 0;
 822
 823 err_fw_download:
 824         ath9k_hif_usb_dealloc_urbs(hif_dev);
 825 err_urb:
 826         release_firmware(hif_dev->firmware);
 827 err_fw_req:
 828         hif_dev->firmware = NULL;
 829         return ret;
 830 }
 831
 832 static void ath9k_hif_usb_dev_deinit(struct hif_device_usb *hif_dev)
 833 {
 834         ath9k_hif_usb_dealloc_urbs(hif_dev);
 835         if (hif_dev->firmware)
 836                 release_firmware(hif_dev->firmware);
 837 }
 838
 839 static int ath9k_hif_usb_probe(struct usb_interface *interface,
 840                                const struct usb_device_id *id)
 841 {
 842         struct usb_device *udev = interface_to_usbdev(interface);
 843         struct hif_device_usb *hif_dev;
 844         const char *fw_name = (const char *) id->driver_info;
 845         int ret = 0;
 846
 847         hif_dev = kzalloc(sizeof(struct hif_device_usb), GFP_KERNEL);
 848         if (!hif_dev) {
 849                 ret = -ENOMEM;
 850                 goto err_alloc;
 851         }
 852
 853         usb_get_dev(udev);
 854         hif_dev->udev = udev;
 855         hif_dev->interface = interface;
 856         hif_dev->device_id = id->idProduct;
 857 #ifdef CONFIG_PM
 858         udev->reset_resume = 1;
 859 #endif
 860         usb_set_intfdata(interface, hif_dev);
 861
 862         hif_dev->htc_handle = ath9k_htc_hw_alloc(hif_dev, &hif_usb,
 863                                                  &hif_dev->udev->dev);
 864         if (hif_dev->htc_handle == NULL) {
 865                 ret = -ENOMEM;
 866                 goto err_htc_hw_alloc;
 867         }
 868
 869         ret = ath9k_hif_usb_dev_init(hif_dev, fw_name);
 870         if (ret) {
 871                 ret = -EINVAL;
 872                 goto err_hif_init_usb;
 873         }
 874
 875         ret = ath9k_htc_hw_init(hif_dev->htc_handle,
 876                                 &hif_dev->udev->dev, hif_dev->device_id);
 877         if (ret) {
 878                 ret = -EINVAL;
 879                 goto err_htc_hw_init;
 880         }
 881
 882         dev_info(&hif_dev->udev->dev, "ath9k_htc: USB layer initialized\n");
 883
 884         return 0;
 885
 886 err_htc_hw_init:
 887         ath9k_hif_usb_dev_deinit(hif_dev);
 888 err_hif_init_usb:
 889         ath9k_htc_hw_free(hif_dev->htc_handle);
 890 err_htc_hw_alloc:
 891         usb_set_intfdata(interface, NULL);
 892         kfree(hif_dev);
 893         usb_put_dev(udev);
 894 err_alloc:
 895         return ret;
 896 }
 897
 898 static void ath9k_hif_usb_reboot(struct usb_device *udev)
 899 {
 900         u32 reboot_cmd = 0xffffffff;
 901         void *buf;
 902         int ret;
 903
 904         buf = kmalloc(4, GFP_KERNEL);
 905         if (!buf)
 906                 return;
 907
 908         memcpy(buf, &reboot_cmd, 4);
 909
 910         ret = usb_bulk_msg(udev, usb_sndbulkpipe(udev, USB_REG_OUT_PIPE),
 911                            buf, 4, NULL, HZ);
 912         if (ret)
 913                 dev_err(&udev->dev, "ath9k_htc: USB reboot failed\n");
 914
 915         kfree(buf);
 916 }
 917
 918 static void ath9k_hif_usb_disconnect(struct usb_interface *interface)
 919 {
 920         struct usb_device *udev = interface_to_usbdev(interface);
 921         struct hif_device_usb *hif_dev =
 922                 (struct hif_device_usb *) usb_get_intfdata(interface);
 923
 924         if (hif_dev) {
 925                 ath9k_htc_hw_deinit(hif_dev->htc_handle,
 926                     (udev->state == USB_STATE_NOTATTACHED) ? true : false);
 927                 ath9k_htc_hw_free(hif_dev->htc_handle);
 928                 ath9k_hif_usb_dev_deinit(hif_dev);
 929                 usb_set_intfdata(interface, NULL);
 930         }
 931
 932         if (hif_dev->flags & HIF_USB_START)
 933                 ath9k_hif_usb_reboot(udev);
 934
 935         kfree(hif_dev);
 936         dev_info(&udev->dev, "ath9k_htc: USB layer deinitialized\n");
 937         usb_put_dev(udev);
 938 }
 939
 940 #ifdef CONFIG_PM
 941 static int ath9k_hif_usb_suspend(struct usb_interface *interface,
 942                                  pm_message_t message)
 943 {
 944         struct hif_device_usb *hif_dev =
 945                 (struct hif_device_usb *) usb_get_intfdata(interface);
 946
 947         ath9k_hif_usb_dealloc_urbs(hif_dev);
 948
 949         return 0;
 950 }
 951
 952 static int ath9k_hif_usb_resume(struct usb_interface *interface)
 953 {
 954         struct hif_device_usb *hif_dev =
 955                 (struct hif_device_usb *) usb_get_intfdata(interface);
 956         int ret;
 957
 958         ret = ath9k_hif_usb_alloc_urbs(hif_dev);
 959         if (ret)
 960                 return ret;
 961
 962         if (hif_dev->firmware) {
 963                 ret = ath9k_hif_usb_download_fw(hif_dev);
 964                 if (ret)
 965                         goto fail_resume;
 966         } else {
 967                 ath9k_hif_usb_dealloc_urbs(hif_dev);
 968                 return -EIO;
 969         }
 970
 971         mdelay(100);
 972
 973         ret = ath9k_htc_resume(hif_dev->htc_handle);
 974
 975         if (ret)
 976                 goto fail_resume;
 977
 978         return 0;
 979
 980 fail_resume:
 981         ath9k_hif_usb_dealloc_urbs(hif_dev);
 982
 983         return ret;
 984 }
 985 #endif
 986
 987 static struct usb_driver ath9k_hif_usb_driver = {
 988         .name = "ath9k_hif_usb",
 989         .probe = ath9k_hif_usb_probe,
 990         .disconnect = ath9k_hif_usb_disconnect,
 991 #ifdef CONFIG_PM
 992         .suspend = ath9k_hif_usb_suspend,
 993         .resume = ath9k_hif_usb_resume,
 994         .reset_resume = ath9k_hif_usb_resume,
 995 #endif
 996         .id_table = ath9k_hif_usb_ids,
 997         .soft_unbind = 1,
 998 };
 999
1000 int ath9k_hif_usb_init(void)
1001 {
1002         return usb_register(&ath9k_hif_usb_driver);
1003 }
1004
1005 void ath9k_hif_usb_exit(void)
1006 {
1007         usb_deregister(&ath9k_hif_usb_driver);
1008 }