drivers/net/wireless/ath/ath9k/hif_usb.c

   1 /*
   2  * Copyright (c) 2010 Atheros Communications Inc.
   3  *
   4  * Permission to use, copy, modify, and/or distribute this software for any
   5  * purpose with or without fee is hereby granted, provided that the above
   6  * copyright notice and this permission notice appear in all copies.
   7  *
   8  * THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL WARRANTIES
   9  * WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF
  10  * MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR
  11  * ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES
  12  * WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN
  13  * ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF
  14  * OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
  15  */
  16
  17 #include "htc.h"
  18
  19 /* identify firmware images */
  20 #define FIRMWARE_AR7010         "ar7010.fw"
  21 #define FIRMWARE_AR7010_1_1     "ar7010_1_1.fw"
  22 #define FIRMWARE_AR9271         "ar9271.fw"
  23
  24 MODULE_FIRMWARE(FIRMWARE_AR7010);
  25 MODULE_FIRMWARE(FIRMWARE_AR7010_1_1);
  26 MODULE_FIRMWARE(FIRMWARE_AR9271);
  27
  28 static struct usb_device_id ath9k_hif_usb_ids[] = {
  29         { USB_DEVICE(0x0cf3, 0x9271) }, /* Atheros */
  30         { USB_DEVICE(0x0cf3, 0x1006) }, /* Atheros */
  31         { USB_DEVICE(0x0846, 0x9030) }, /* Netgear N150 */
  32         { USB_DEVICE(0x07D1, 0x3A10) }, /* Dlink Wireless 150 */
  33         { USB_DEVICE(0x13D3, 0x3327) }, /* Azurewave */
  34         { USB_DEVICE(0x13D3, 0x3328) }, /* Azurewave */
  35         { USB_DEVICE(0x13D3, 0x3346) }, /* IMC Networks */
  36         { USB_DEVICE(0x13D3, 0x3348) }, /* Azurewave */
  37         { USB_DEVICE(0x13D3, 0x3349) }, /* Azurewave */
  38         { USB_DEVICE(0x13D3, 0x3350) }, /* Azurewave */
  39         { USB_DEVICE(0x04CA, 0x4605) }, /* Liteon */
  40         { USB_DEVICE(0x040D, 0x3801) }, /* VIA */
  41
  42         { USB_DEVICE(0x0cf3, 0x7015),
  43           .driver_info = AR9287_USB },  /* Atheros */
  44         { USB_DEVICE(0x1668, 0x1200),
  45           .driver_info = AR9287_USB },  /* Verizon */
  46
  47         { USB_DEVICE(0x0cf3, 0x7010),
  48           .driver_info = AR9280_USB },  /* Atheros */
  49         { USB_DEVICE(0x0846, 0x9018),
  50           .driver_info = AR9280_USB },  /* Netgear WNDA3200 */
  51         { USB_DEVICE(0x083A, 0xA704),
  52           .driver_info = AR9280_USB },  /* SMC Networks */
  53
  54         { },
  55 };
  56
  57 MODULE_DEVICE_TABLE(usb, ath9k_hif_usb_ids);
  58
  59 static int __hif_usb_tx(struct hif_device_usb *hif_dev);
  60
  61 static void hif_usb_regout_cb(struct urb *urb)
  62 {
  63         struct cmd_buf *cmd = (struct cmd_buf *)urb->context;
  64
  65         switch (urb->status) {
  66         case 0:
  67                 break;
  68         case -ENOENT:
  69         case -ECONNRESET:
  70         case -ENODEV:
  71         case -ESHUTDOWN:
  72                 goto free;
  73         default:
  74                 break;
  75         }
  76
  77         if (cmd) {
  78                 ath9k_htc_txcompletion_cb(cmd->hif_dev->htc_handle,
  79                                           cmd->skb, 1);
  80                 kfree(cmd);
  81         }
  82
  83         return;
  84 free:
  85         kfree_skb(cmd->skb);
  86         kfree(cmd);
  87 }
  88
  89 static int hif_usb_send_regout(struct hif_device_usb *hif_dev,
  90                                struct sk_buff *skb)
  91 {
  92         struct urb *urb;
  93         struct cmd_buf *cmd;
  94         int ret = 0;
  95
  96         urb = usb_alloc_urb(0, GFP_KERNEL);
  97         if (urb == NULL)
  98                 return -ENOMEM;
  99
 100         cmd = kzalloc(sizeof(*cmd), GFP_KERNEL);
 101         if (cmd == NULL) {
 102                 usb_free_urb(urb);
 103                 return -ENOMEM;
 104         }
 105
 106         cmd->skb = skb;
 107         cmd->hif_dev = hif_dev;
 108
 109         usb_fill_bulk_urb(urb, hif_dev->udev,
 110                          usb_sndbulkpipe(hif_dev->udev, USB_REG_OUT_PIPE),
 111                          skb->data, skb->len,
 112                          hif_usb_regout_cb, cmd);
 113
 114         usb_anchor_urb(urb, &hif_dev->regout_submitted);
 115         ret = usb_submit_urb(urb, GFP_KERNEL);
 116         if (ret) {
 117                 usb_unanchor_urb(urb);
 118                 kfree(cmd);
 119         }
 120         usb_free_urb(urb);
 121
 122         return ret;
 123 }
 124
 125 static inline void ath9k_skb_queue_purge(struct hif_device_usb *hif_dev,
 126                                          struct sk_buff_head *list)
 127 {
 128         struct sk_buff *skb;
 129
 130         while ((skb = __skb_dequeue(list)) != NULL) {
 131                 dev_kfree_skb_any(skb);
 132                 TX_STAT_INC(skb_dropped);
 133         }
 134 }
 135
 136 static void hif_usb_tx_cb(struct urb *urb)
 137 {
 138         struct tx_buf *tx_buf = (struct tx_buf *) urb->context;
 139         struct hif_device_usb *hif_dev;
 140         struct sk_buff *skb;
 141
 142         if (!tx_buf || !tx_buf->hif_dev)
 143                 return;
 144
 145         hif_dev = tx_buf->hif_dev;
 146
 147         switch (urb->status) {
 148         case 0:
 149                 break;
 150         case -ENOENT:
 151         case -ECONNRESET:
 152         case -ENODEV:
 153         case -ESHUTDOWN:
 154                 /*
 155                  * The URB has been killed, free the SKBs
 156                  * and return.
 157                  */
 158                 ath9k_skb_queue_purge(hif_dev, &tx_buf->skb_queue);
 159                 return;
 160         default:
 161                 break;
 162         }
 163
 164         /* Check if TX has been stopped */
 165         spin_lock(&hif_dev->tx.tx_lock);
 166         if (hif_dev->tx.flags & HIF_USB_TX_STOP) {
 167                 spin_unlock(&hif_dev->tx.tx_lock);
 168                 ath9k_skb_queue_purge(hif_dev, &tx_buf->skb_queue);
 169                 goto add_free;
 170         }
 171         spin_unlock(&hif_dev->tx.tx_lock);
 172
 173         /* Complete the queued SKBs. */
 174         while ((skb = __skb_dequeue(&tx_buf->skb_queue)) != NULL) {
 175                 ath9k_htc_txcompletion_cb(hif_dev->htc_handle,
 176                                           skb, 1);
 177                 TX_STAT_INC(skb_completed);
 178         }
 179
 180 add_free:
 181         /* Re-initialize the SKB queue */
 182         tx_buf->len = tx_buf->offset = 0;
 183         __skb_queue_head_init(&tx_buf->skb_queue);
 184
 185         /* Add this TX buffer to the free list */
 186         spin_lock(&hif_dev->tx.tx_lock);
 187         list_move_tail(&tx_buf->list, &hif_dev->tx.tx_buf);
 188         hif_dev->tx.tx_buf_cnt++;
 189         if (!(hif_dev->tx.flags & HIF_USB_TX_STOP))
 190                 __hif_usb_tx(hif_dev); /* Check for pending SKBs */
 191         TX_STAT_INC(buf_completed);
 192         spin_unlock(&hif_dev->tx.tx_lock);
 193 }
 194
 195 /* TX lock has to be taken */
 196 static int __hif_usb_tx(struct hif_device_usb *hif_dev)
 197 {
 198         struct tx_buf *tx_buf = NULL;
 199         struct sk_buff *nskb = NULL;
 200         int ret = 0, i;
 201         u16 *hdr, tx_skb_cnt = 0;
 202         u8 *buf;
 203
 204         if (hif_dev->tx.tx_skb_cnt == 0)
 205                 return 0;
 206
 207         /* Check if a free TX buffer is available */
 208         if (list_empty(&hif_dev->tx.tx_buf))
 209                 return 0;
 210
 211         tx_buf = list_first_entry(&hif_dev->tx.tx_buf, struct tx_buf, list);
 212         list_move_tail(&tx_buf->list, &hif_dev->tx.tx_pending);
 213         hif_dev->tx.tx_buf_cnt--;
 214
 215         tx_skb_cnt = min_t(u16, hif_dev->tx.tx_skb_cnt, MAX_TX_AGGR_NUM);
 216
 217         for (i = 0; i < tx_skb_cnt; i++) {
 218                 nskb = __skb_dequeue(&hif_dev->tx.tx_skb_queue);
 219
 220                 /* Should never be NULL */
 221                 BUG_ON(!nskb);
 222
 223                 hif_dev->tx.tx_skb_cnt--;
 224
 225                 buf = tx_buf->buf;
 226                 buf += tx_buf->offset;
 227                 hdr = (u16 *)buf;
 228                 *hdr++ = nskb->len;
 229                 *hdr++ = ATH_USB_TX_STREAM_MODE_TAG;
 230                 buf += 4;
 231                 memcpy(buf, nskb->data, nskb->len);
 232                 tx_buf->len = nskb->len + 4;
 233
 234                 if (i < (tx_skb_cnt - 1))
 235                         tx_buf->offset += (((tx_buf->len - 1) / 4) + 1) * 4;
 236
 237                 if (i == (tx_skb_cnt - 1))
 238                         tx_buf->len += tx_buf->offset;
 239
 240                 __skb_queue_tail(&tx_buf->skb_queue, nskb);
 241                 TX_STAT_INC(skb_queued);
 242         }
 243
 244         usb_fill_bulk_urb(tx_buf->urb, hif_dev->udev,
 245                           usb_sndbulkpipe(hif_dev->udev, USB_WLAN_TX_PIPE),
 246                           tx_buf->buf, tx_buf->len,
 247                           hif_usb_tx_cb, tx_buf);
 248
 249         ret = usb_submit_urb(tx_buf->urb, GFP_ATOMIC);
 250         if (ret) {
 251                 tx_buf->len = tx_buf->offset = 0;
 252                 ath9k_skb_queue_purge(hif_dev, &tx_buf->skb_queue);
 253                 __skb_queue_head_init(&tx_buf->skb_queue);
 254                 list_move_tail(&tx_buf->list, &hif_dev->tx.tx_buf);
 255                 hif_dev->tx.tx_buf_cnt++;
 256         }
 257
 258         if (!ret)
 259                 TX_STAT_INC(buf_queued);
 260
 261         return ret;
 262 }
 263
 264 static int hif_usb_send_tx(struct hif_device_usb *hif_dev, struct sk_buff *skb,
 265                            struct ath9k_htc_tx_ctl *tx_ctl)
 266 {
 267         unsigned long flags;
 268
 269         spin_lock_irqsave(&hif_dev->tx.tx_lock, flags);
 270
 271         if (hif_dev->tx.flags & HIF_USB_TX_STOP) {
 272                 spin_unlock_irqrestore(&hif_dev->tx.tx_lock, flags);
 273                 return -ENODEV;
 274         }
 275
 276         /* Check if the max queue count has been reached */
 277         if (hif_dev->tx.tx_skb_cnt > MAX_TX_BUF_NUM) {
 278                 spin_unlock_irqrestore(&hif_dev->tx.tx_lock, flags);
 279                 return -ENOMEM;
 280         }
 281
 282         __skb_queue_tail(&hif_dev->tx.tx_skb_queue, skb);
 283         hif_dev->tx.tx_skb_cnt++;
 284
 285         /* Send normal frames immediately */
 286         if (!tx_ctl || (tx_ctl && (tx_ctl->type == ATH9K_HTC_NORMAL)))
 287                 __hif_usb_tx(hif_dev);
 288
 289         /* Check if AMPDUs have to be sent immediately */
 290         if (tx_ctl && (tx_ctl->type == ATH9K_HTC_AMPDU) &&
 291             (hif_dev->tx.tx_buf_cnt == MAX_TX_URB_NUM) &&
 292             (hif_dev->tx.tx_skb_cnt < 2)) {
 293                 __hif_usb_tx(hif_dev);
 294         }
 295
 296         spin_unlock_irqrestore(&hif_dev->tx.tx_lock, flags);
 297
 298         return 0;
 299 }
 300
 301 static void hif_usb_start(void *hif_handle, u8 pipe_id)
 302 {
 303         struct hif_device_usb *hif_dev = (struct hif_device_usb *)hif_handle;
 304         unsigned long flags;
 305
 306         hif_dev->flags |= HIF_USB_START;
 307
 308         spin_lock_irqsave(&hif_dev->tx.tx_lock, flags);
 309         hif_dev->tx.flags &= ~HIF_USB_TX_STOP;
 310         spin_unlock_irqrestore(&hif_dev->tx.tx_lock, flags);
 311 }
 312
 313 static void hif_usb_stop(void *hif_handle, u8 pipe_id)
 314 {
 315         struct hif_device_usb *hif_dev = (struct hif_device_usb *)hif_handle;
 316         unsigned long flags;
 317
 318         spin_lock_irqsave(&hif_dev->tx.tx_lock, flags);
 319         ath9k_skb_queue_purge(hif_dev, &hif_dev->tx.tx_skb_queue);
 320         hif_dev->tx.tx_skb_cnt = 0;
 321         hif_dev->tx.flags |= HIF_USB_TX_STOP;
 322         spin_unlock_irqrestore(&hif_dev->tx.tx_lock, flags);
 323 }
 324
 325 static int hif_usb_send(void *hif_handle, u8 pipe_id, struct sk_buff *skb,
 326                         struct ath9k_htc_tx_ctl *tx_ctl)
 327 {
 328         struct hif_device_usb *hif_dev = (struct hif_device_usb *)hif_handle;
 329         int ret = 0;
 330
 331         switch (pipe_id) {
 332         case USB_WLAN_TX_PIPE:
 333                 ret = hif_usb_send_tx(hif_dev, skb, tx_ctl);
 334                 break;
 335         case USB_REG_OUT_PIPE:
 336                 ret = hif_usb_send_regout(hif_dev, skb);
 337                 break;
 338         default:
 339                 dev_err(&hif_dev->udev->dev,
 340                         "ath9k_htc: Invalid TX pipe: %d\n", pipe_id);
 341                 ret = -EINVAL;
 342                 break;
 343         }
 344
 345         return ret;
 346 }
 347
 348 static struct ath9k_htc_hif hif_usb = {
 349         .transport = ATH9K_HIF_USB,
 350         .name = "ath9k_hif_usb",
 351
 352         .control_ul_pipe = USB_REG_OUT_PIPE,
 353         .control_dl_pipe = USB_REG_IN_PIPE,
 354
 355         .start = hif_usb_start,
 356         .stop = hif_usb_stop,
 357         .send = hif_usb_send,
 358 };
 359
 360 static void ath9k_hif_usb_rx_stream(struct hif_device_usb *hif_dev,
 361                                     struct sk_buff *skb)
 362 {
 363         struct sk_buff *nskb, *skb_pool[MAX_PKT_NUM_IN_TRANSFER];
 364         int index = 0, i = 0, len = skb->len;
 365         int rx_remain_len, rx_pkt_len;
 366         u16 pool_index = 0;
 367         u8 *ptr;
 368
 369         spin_lock(&hif_dev->rx_lock);
 370
 371         rx_remain_len = hif_dev->rx_remain_len;
 372         rx_pkt_len = hif_dev->rx_transfer_len;
 373
 374         if (rx_remain_len != 0) {
 375                 struct sk_buff *remain_skb = hif_dev->remain_skb;
 376
 377                 if (remain_skb) {
 378                         ptr = (u8 *) remain_skb->data;
 379
 380                         index = rx_remain_len;
 381                         rx_remain_len -= hif_dev->rx_pad_len;
 382                         ptr += rx_pkt_len;
 383
 384                         memcpy(ptr, skb->data, rx_remain_len);
 385
 386                         rx_pkt_len += rx_remain_len;
 387                         hif_dev->rx_remain_len = 0;
 388                         skb_put(remain_skb, rx_pkt_len);
 389
 390                         skb_pool[pool_index++] = remain_skb;
 391
 392                 } else {
 393                         index = rx_remain_len;
 394                 }
 395         }
 396
 397         spin_unlock(&hif_dev->rx_lock);
 398
 399         while (index < len) {
 400                 u16 pkt_len;
 401                 u16 pkt_tag;
 402                 u16 pad_len;
 403                 int chk_idx;
 404
 405                 ptr = (u8 *) skb->data;
 406
 407                 pkt_len = ptr[index] + (ptr[index+1] << 8);
 408                 pkt_tag = ptr[index+2] + (ptr[index+3] << 8);
 409
 410                 if (pkt_tag != ATH_USB_RX_STREAM_MODE_TAG) {
 411                         RX_STAT_INC(skb_dropped);
 412                         return;
 413                 }
 414
 415                 pad_len = 4 - (pkt_len & 0x3);
 416                 if (pad_len == 4)
 417                         pad_len = 0;
 418
 419                 chk_idx = index;
 420                 index = index + 4 + pkt_len + pad_len;
 421
 422                 if (index > MAX_RX_BUF_SIZE) {
 423                         spin_lock(&hif_dev->rx_lock);
 424                         hif_dev->rx_remain_len = index - MAX_RX_BUF_SIZE;
 425                         hif_dev->rx_transfer_len =
 426                                 MAX_RX_BUF_SIZE - chk_idx - 4;
 427                         hif_dev->rx_pad_len = pad_len;
 428
 429                         nskb = __dev_alloc_skb(pkt_len + 32, GFP_ATOMIC);
 430                         if (!nskb) {
 431                                 dev_err(&hif_dev->udev->dev,
 432                                         "ath9k_htc: RX memory allocation error\n");
 433                                 spin_unlock(&hif_dev->rx_lock);
 434                                 goto err;
 435                         }
 436                         skb_reserve(nskb, 32);
 437                         RX_STAT_INC(skb_allocated);
 438
 439                         memcpy(nskb->data, &(skb->data[chk_idx+4]),
 440                                hif_dev->rx_transfer_len);
 441
 442                         /* Record the buffer pointer */
 443                         hif_dev->remain_skb = nskb;
 444                         spin_unlock(&hif_dev->rx_lock);
 445                 } else {
 446                         nskb = __dev_alloc_skb(pkt_len + 32, GFP_ATOMIC);
 447                         if (!nskb) {
 448                                 dev_err(&hif_dev->udev->dev,
 449                                         "ath9k_htc: RX memory allocation error\n");
 450                                 goto err;
 451                         }
 452                         skb_reserve(nskb, 32);
 453                         RX_STAT_INC(skb_allocated);
 454
 455                         memcpy(nskb->data, &(skb->data[chk_idx+4]), pkt_len);
 456                         skb_put(nskb, pkt_len);
 457                         skb_pool[pool_index++] = nskb;
 458                 }
 459         }
 460
 461 err:
 462         for (i = 0; i < pool_index; i++) {
 463                 ath9k_htc_rx_msg(hif_dev->htc_handle, skb_pool[i],
 464                                  skb_pool[i]->len, USB_WLAN_RX_PIPE);
 465                 RX_STAT_INC(skb_completed);
 466         }
 467 }
 468
 469 static void ath9k_hif_usb_rx_cb(struct urb *urb)
 470 {
 471         struct sk_buff *skb = (struct sk_buff *) urb->context;
 472         struct hif_device_usb *hif_dev =
 473                 usb_get_intfdata(usb_ifnum_to_if(urb->dev, 0));
 474         int ret;
 475
 476         if (!skb)
 477                 return;
 478
 479         if (!hif_dev)
 480                 goto free;
 481
 482         switch (urb->status) {
 483         case 0:
 484                 break;
 485         case -ENOENT:
 486         case -ECONNRESET:
 487         case -ENODEV:
 488         case -ESHUTDOWN:
 489                 goto free;
 490         default:
 491                 goto resubmit;
 492         }
 493
 494         if (likely(urb->actual_length != 0)) {
 495                 skb_put(skb, urb->actual_length);
 496                 ath9k_hif_usb_rx_stream(hif_dev, skb);
 497         }
 498
 499 resubmit:
 500         skb_reset_tail_pointer(skb);
 501         skb_trim(skb, 0);
 502
 503         usb_anchor_urb(urb, &hif_dev->rx_submitted);
 504         ret = usb_submit_urb(urb, GFP_ATOMIC);
 505         if (ret) {
 506                 usb_unanchor_urb(urb);
 507                 goto free;
 508         }
 509
 510         return;
 511 free:
 512         kfree_skb(skb);
 513 }
 514
 515 static void ath9k_hif_usb_reg_in_cb(struct urb *urb)
 516 {
 517         struct sk_buff *skb = (struct sk_buff *) urb->context;
 518         struct sk_buff *nskb;
 519         struct hif_device_usb *hif_dev =
 520                 usb_get_intfdata(usb_ifnum_to_if(urb->dev, 0));
 521         int ret;
 522
 523         if (!skb)
 524                 return;
 525
 526         if (!hif_dev)
 527                 goto free;
 528
 529         switch (urb->status) {
 530         case 0:
 531                 break;
 532         case -ENOENT:
 533         case -ECONNRESET:
 534         case -ENODEV:
 535         case -ESHUTDOWN:
 536                 goto free;
 537         default:
 538                 goto resubmit;
 539         }
 540
 541         if (likely(urb->actual_length != 0)) {
 542                 skb_put(skb, urb->actual_length);
 543
 544                 /* Process the command first */
 545                 ath9k_htc_rx_msg(hif_dev->htc_handle, skb,
 546                                  skb->len, USB_REG_IN_PIPE);
 547
 548
 549                 nskb = alloc_skb(MAX_REG_IN_BUF_SIZE, GFP_ATOMIC);
 550                 if (!nskb) {
 551                         dev_err(&hif_dev->udev->dev,
 552                                 "ath9k_htc: REG_IN memory allocation failure\n");
 553                         urb->context = NULL;
 554                         return;
 555                 }
 556
 557                 usb_fill_bulk_urb(urb, hif_dev->udev,
 558                                  usb_rcvbulkpipe(hif_dev->udev,
 559                                                  USB_REG_IN_PIPE),
 560                                  nskb->data, MAX_REG_IN_BUF_SIZE,
 561                                  ath9k_hif_usb_reg_in_cb, nskb);
 562
 563                 ret = usb_submit_urb(urb, GFP_ATOMIC);
 564                 if (ret) {
 565                         kfree_skb(nskb);
 566                         urb->context = NULL;
 567                 }
 568
 569                 return;
 570         }
 571
 572 resubmit:
 573         skb_reset_tail_pointer(skb);
 574         skb_trim(skb, 0);
 575
 576         ret = usb_submit_urb(urb, GFP_ATOMIC);
 577         if (ret)
 578                 goto free;
 579
 580         return;
 581 free:
 582         kfree_skb(skb);
 583         urb->context = NULL;
 584 }
 585
 586 static void ath9k_hif_usb_dealloc_tx_urbs(struct hif_device_usb *hif_dev)
 587 {
 588         struct tx_buf *tx_buf = NULL, *tx_buf_tmp = NULL;
 589
 590         list_for_each_entry_safe(tx_buf, tx_buf_tmp,
 591                                  &hif_dev->tx.tx_buf, list) {
 592                 usb_kill_urb(tx_buf->urb);
 593                 list_del(&tx_buf->list);
 594                 usb_free_urb(tx_buf->urb);
 595                 kfree(tx_buf->buf);
 596                 kfree(tx_buf);
 597         }
 598
 599         list_for_each_entry_safe(tx_buf, tx_buf_tmp,
 600                                  &hif_dev->tx.tx_pending, list) {
 601                 usb_kill_urb(tx_buf->urb);
 602                 list_del(&tx_buf->list);
 603                 usb_free_urb(tx_buf->urb);
 604                 kfree(tx_buf->buf);
 605                 kfree(tx_buf);
 606         }
 607 }
 608
 609 static int ath9k_hif_usb_alloc_tx_urbs(struct hif_device_usb *hif_dev)
 610 {
 611         struct tx_buf *tx_buf;
 612         int i;
 613
 614         INIT_LIST_HEAD(&hif_dev->tx.tx_buf);
 615         INIT_LIST_HEAD(&hif_dev->tx.tx_pending);
 616         spin_lock_init(&hif_dev->tx.tx_lock);
 617         __skb_queue_head_init(&hif_dev->tx.tx_skb_queue);
 618
 619         for (i = 0; i < MAX_TX_URB_NUM; i++) {
 620                 tx_buf = kzalloc(sizeof(struct tx_buf), GFP_KERNEL);
 621                 if (!tx_buf)
 622                         goto err;
 623
 624                 tx_buf->buf = kzalloc(MAX_TX_BUF_SIZE, GFP_KERNEL);
 625                 if (!tx_buf->buf)
 626                         goto err;
 627
 628                 tx_buf->urb = usb_alloc_urb(0, GFP_KERNEL);
 629                 if (!tx_buf->urb)
 630                         goto err;
 631
 632                 tx_buf->hif_dev = hif_dev;
 633                 __skb_queue_head_init(&tx_buf->skb_queue);
 634
 635                 list_add_tail(&tx_buf->list, &hif_dev->tx.tx_buf);
 636         }
 637
 638         hif_dev->tx.tx_buf_cnt = MAX_TX_URB_NUM;
 639
 640         return 0;
 641 err:
 642         if (tx_buf) {
 643                 kfree(tx_buf->buf);
 644                 kfree(tx_buf);
 645         }
 646         ath9k_hif_usb_dealloc_tx_urbs(hif_dev);
 647         return -ENOMEM;
 648 }
 649
 650 static void ath9k_hif_usb_dealloc_rx_urbs(struct hif_device_usb *hif_dev)
 651 {
 652         usb_kill_anchored_urbs(&hif_dev->rx_submitted);
 653 }
 654
 655 static int ath9k_hif_usb_alloc_rx_urbs(struct hif_device_usb *hif_dev)
 656 {
 657         struct urb *urb = NULL;
 658         struct sk_buff *skb = NULL;
 659         int i, ret;
 660
 661         init_usb_anchor(&hif_dev->rx_submitted);
 662         spin_lock_init(&hif_dev->rx_lock);
 663
 664         for (i = 0; i < MAX_RX_URB_NUM; i++) {
 665
 666                 /* Allocate URB */
 667                 urb = usb_alloc_urb(0, GFP_KERNEL);
 668                 if (urb == NULL) {
 669                         ret = -ENOMEM;
 670                         goto err_urb;
 671                 }
 672
 673                 /* Allocate buffer */
 674                 skb = alloc_skb(MAX_RX_BUF_SIZE, GFP_KERNEL);
 675                 if (!skb) {
 676                         ret = -ENOMEM;
 677                         goto err_skb;
 678                 }
 679
 680                 usb_fill_bulk_urb(urb, hif_dev->udev,
 681                                   usb_rcvbulkpipe(hif_dev->udev,
 682                                                   USB_WLAN_RX_PIPE),
 683                                   skb->data, MAX_RX_BUF_SIZE,
 684                                   ath9k_hif_usb_rx_cb, skb);
 685
 686                 /* Anchor URB */
 687                 usb_anchor_urb(urb, &hif_dev->rx_submitted);
 688
 689                 /* Submit URB */
 690                 ret = usb_submit_urb(urb, GFP_KERNEL);
 691                 if (ret) {
 692                         usb_unanchor_urb(urb);
 693                         goto err_submit;
 694                 }
 695
 696                 /*
 697                  * Drop reference count.
 698                  * This ensures that the URB is freed when killing them.
 699                  */
 700                 usb_free_urb(urb);
 701         }
 702
 703         return 0;
 704
 705 err_submit:
 706         kfree_skb(skb);
 707 err_skb:
 708         usb_free_urb(urb);
 709 err_urb:
 710         ath9k_hif_usb_dealloc_rx_urbs(hif_dev);
 711         return ret;
 712 }
 713
 714 static void ath9k_hif_usb_dealloc_reg_in_urb(struct hif_device_usb *hif_dev)
 715 {
 716         if (hif_dev->reg_in_urb) {
 717                 usb_kill_urb(hif_dev->reg_in_urb);
 718                 if (hif_dev->reg_in_urb->context)
 719                         kfree_skb((void *)hif_dev->reg_in_urb->context);
 720                 usb_free_urb(hif_dev->reg_in_urb);
 721                 hif_dev->reg_in_urb = NULL;
 722         }
 723 }
 724
 725 static int ath9k_hif_usb_alloc_reg_in_urb(struct hif_device_usb *hif_dev)
 726 {
 727         struct sk_buff *skb;
 728
 729         hif_dev->reg_in_urb = usb_alloc_urb(0, GFP_KERNEL);
 730         if (hif_dev->reg_in_urb == NULL)
 731                 return -ENOMEM;
 732
 733         skb = alloc_skb(MAX_REG_IN_BUF_SIZE, GFP_KERNEL);
 734         if (!skb)
 735                 goto err;
 736
 737         usb_fill_bulk_urb(hif_dev->reg_in_urb, hif_dev->udev,
 738                          usb_rcvbulkpipe(hif_dev->udev,
 739                                          USB_REG_IN_PIPE),
 740                          skb->data, MAX_REG_IN_BUF_SIZE,
 741                          ath9k_hif_usb_reg_in_cb, skb);
 742
 743         if (usb_submit_urb(hif_dev->reg_in_urb, GFP_KERNEL) != 0)
 744                 goto err;
 745
 746         return 0;
 747
 748 err:
 749         ath9k_hif_usb_dealloc_reg_in_urb(hif_dev);
 750         return -ENOMEM;
 751 }
 752
 753 static int ath9k_hif_usb_alloc_urbs(struct hif_device_usb *hif_dev)
 754 {
 755         /* Register Write */
 756         init_usb_anchor(&hif_dev->regout_submitted);
 757
 758         /* TX */
 759         if (ath9k_hif_usb_alloc_tx_urbs(hif_dev) < 0)
 760                 goto err;
 761
 762         /* RX */
 763         if (ath9k_hif_usb_alloc_rx_urbs(hif_dev) < 0)
 764                 goto err_rx;
 765
 766         /* Register Read */
 767         if (ath9k_hif_usb_alloc_reg_in_urb(hif_dev) < 0)
 768                 goto err_reg;
 769
 770         return 0;
 771 err_reg:
 772         ath9k_hif_usb_dealloc_rx_urbs(hif_dev);
 773 err_rx:
 774         ath9k_hif_usb_dealloc_tx_urbs(hif_dev);
 775 err:
 776         return -ENOMEM;
 777 }
 778
 779 static void ath9k_hif_usb_dealloc_urbs(struct hif_device_usb *hif_dev)
 780 {
 781         usb_kill_anchored_urbs(&hif_dev->regout_submitted);
 782         ath9k_hif_usb_dealloc_reg_in_urb(hif_dev);
 783         ath9k_hif_usb_dealloc_tx_urbs(hif_dev);
 784         ath9k_hif_usb_dealloc_rx_urbs(hif_dev);
 785 }
 786
 787 static int ath9k_hif_usb_download_fw(struct hif_device_usb *hif_dev,
 788                                      u32 drv_info)
 789 {
 790         int transfer, err;
 791         const void *data = hif_dev->firmware->data;
 792         size_t len = hif_dev->firmware->size;
 793         u32 addr = AR9271_FIRMWARE;
 794         u8 *buf = kzalloc(4096, GFP_KERNEL);
 795         u32 firm_offset;
 796
 797         if (!buf)
 798                 return -ENOMEM;
 799
 800         while (len) {
 801                 transfer = min_t(int, len, 4096);
 802                 memcpy(buf, data, transfer);
 803
 804                 err = usb_control_msg(hif_dev->udev,
 805                                       usb_sndctrlpipe(hif_dev->udev, 0),
 806                                       FIRMWARE_DOWNLOAD, 0x40 | USB_DIR_OUT,
 807                                       addr >> 8, 0, buf, transfer, HZ);
 808                 if (err < 0) {
 809                         kfree(buf);
 810                         return err;
 811                 }
 812
 813                 len -= transfer;
 814                 data += transfer;
 815                 addr += transfer;
 816         }
 817         kfree(buf);
 818
 819         if (IS_AR7010_DEVICE(drv_info))
 820                 firm_offset = AR7010_FIRMWARE_TEXT;
 821         else
 822                 firm_offset = AR9271_FIRMWARE_TEXT;
 823
 824         /*
 825          * Issue FW download complete command to firmware.
 826          */
 827         err = usb_control_msg(hif_dev->udev, usb_sndctrlpipe(hif_dev->udev, 0),
 828                               FIRMWARE_DOWNLOAD_COMP,
 829                               0x40 | USB_DIR_OUT,
 830                               firm_offset >> 8, 0, NULL, 0, HZ);
 831         if (err)
 832                 return -EIO;
 833
 834         dev_info(&hif_dev->udev->dev, "ath9k_htc: Transferred FW: %s, size: %ld\n",
 835                  hif_dev->fw_name, (unsigned long) hif_dev->firmware->size);
 836
 837         return 0;
 838 }
 839
 840 static int ath9k_hif_usb_dev_init(struct hif_device_usb *hif_dev, u32 drv_info)
 841 {
 842         int ret, idx;
 843         struct usb_host_interface *alt = &hif_dev->interface->altsetting[0];
 844         struct usb_endpoint_descriptor *endp;
 845
 846         /* Request firmware */
 847         ret = request_firmware(&hif_dev->firmware, hif_dev->fw_name,
 848                                &hif_dev->udev->dev);
 849         if (ret) {
 850                 dev_err(&hif_dev->udev->dev,
 851                         "ath9k_htc: Firmware - %s not found\n", hif_dev->fw_name);
 852                 goto err_fw_req;
 853         }
 854
 855         /* Download firmware */
 856         ret = ath9k_hif_usb_download_fw(hif_dev, drv_info);
 857         if (ret) {
 858                 dev_err(&hif_dev->udev->dev,
 859                         "ath9k_htc: Firmware - %s download failed\n",
 860                         hif_dev->fw_name);
 861                 goto err_fw_download;
 862         }
 863
 864         /* On downloading the firmware to the target, the USB descriptor of EP4
 865          * is 'patched' to change the type of the endpoint to Bulk. This will
 866          * bring down CPU usage during the scan period.
 867          */
 868         for (idx = 0; idx < alt->desc.bNumEndpoints; idx++) {
 869                 endp = &alt->endpoint[idx].desc;
 870                 if ((endp->bmAttributes & USB_ENDPOINT_XFERTYPE_MASK)
 871                                 == USB_ENDPOINT_XFER_INT) {
 872                         endp->bmAttributes &= ~USB_ENDPOINT_XFERTYPE_MASK;
 873                         endp->bmAttributes |= USB_ENDPOINT_XFER_BULK;
 874                         endp->bInterval = 0;
 875                 }
 876         }
 877
 878         /* Alloc URBs */
 879         ret = ath9k_hif_usb_alloc_urbs(hif_dev);
 880         if (ret) {
 881                 dev_err(&hif_dev->udev->dev,
 882                         "ath9k_htc: Unable to allocate URBs\n");
 883                 goto err_urb;
 884         }
 885
 886         return 0;
 887
 888 err_urb:
 889         ath9k_hif_usb_dealloc_urbs(hif_dev);
 890 err_fw_download:
 891         release_firmware(hif_dev->firmware);
 892 err_fw_req:
 893         hif_dev->firmware = NULL;
 894         return ret;
 895 }
 896
 897 static void ath9k_hif_usb_dev_deinit(struct hif_device_usb *hif_dev)
 898 {
 899         ath9k_hif_usb_dealloc_urbs(hif_dev);
 900         if (hif_dev->firmware)
 901                 release_firmware(hif_dev->firmware);
 902 }
 903
 904 static int ath9k_hif_usb_probe(struct usb_interface *interface,
 905                                const struct usb_device_id *id)
 906 {
 907         struct usb_device *udev = interface_to_usbdev(interface);
 908         struct hif_device_usb *hif_dev;
 909         int ret = 0;
 910
 911         hif_dev = kzalloc(sizeof(struct hif_device_usb), GFP_KERNEL);
 912         if (!hif_dev) {
 913                 ret = -ENOMEM;
 914                 goto err_alloc;
 915         }
 916
 917         usb_get_dev(udev);
 918         hif_dev->udev = udev;
 919         hif_dev->interface = interface;
 920         hif_dev->device_id = id->idProduct;
 921 #ifdef CONFIG_PM
 922         udev->reset_resume = 1;
 923 #endif
 924         usb_set_intfdata(interface, hif_dev);
 925
 926         hif_dev->htc_handle = ath9k_htc_hw_alloc(hif_dev, &hif_usb,
 927                                                  &hif_dev->udev->dev);
 928         if (hif_dev->htc_handle == NULL) {
 929                 ret = -ENOMEM;
 930                 goto err_htc_hw_alloc;
 931         }
 932
 933         /* Find out which firmware to load */
 934
 935         if (IS_AR7010_DEVICE(id->driver_info))
 936                 if (le16_to_cpu(udev->descriptor.bcdDevice) == 0x0202)
 937                         hif_dev->fw_name = FIRMWARE_AR7010_1_1;
 938                 else
 939                         hif_dev->fw_name = FIRMWARE_AR7010;
 940         else
 941                 hif_dev->fw_name = FIRMWARE_AR9271;
 942
 943         ret = ath9k_hif_usb_dev_init(hif_dev, id->driver_info);
 944         if (ret) {
 945                 ret = -EINVAL;
 946                 goto err_hif_init_usb;
 947         }
 948
 949         ret = ath9k_htc_hw_init(hif_dev->htc_handle,
 950                                 &hif_dev->udev->dev, hif_dev->device_id,
 951                                 hif_dev->udev->product, id->driver_info);
 952         if (ret) {
 953                 ret = -EINVAL;
 954                 goto err_htc_hw_init;
 955         }
 956
 957         dev_info(&hif_dev->udev->dev, "ath9k_htc: USB layer initialized\n");
 958
 959         return 0;
 960
 961 err_htc_hw_init:
 962         ath9k_hif_usb_dev_deinit(hif_dev);
 963 err_hif_init_usb:
 964         ath9k_htc_hw_free(hif_dev->htc_handle);
 965 err_htc_hw_alloc:
 966         usb_set_intfdata(interface, NULL);
 967         kfree(hif_dev);
 968         usb_put_dev(udev);
 969 err_alloc:
 970         return ret;
 971 }
 972
 973 static void ath9k_hif_usb_reboot(struct usb_device *udev)
 974 {
 975         u32 reboot_cmd = 0xffffffff;
 976         void *buf;
 977         int ret;
 978
 979         buf = kmemdup(&reboot_cmd, 4, GFP_KERNEL);
 980         if (!buf)
 981                 return;
 982
 983         ret = usb_bulk_msg(udev, usb_sndbulkpipe(udev, USB_REG_OUT_PIPE),
 984                            buf, 4, NULL, HZ);
 985         if (ret)
 986                 dev_err(&udev->dev, "ath9k_htc: USB reboot failed\n");
 987
 988         kfree(buf);
 989 }
 990
 991 static void ath9k_hif_usb_disconnect(struct usb_interface *interface)
 992 {
 993         struct usb_device *udev = interface_to_usbdev(interface);
 994         struct hif_device_usb *hif_dev = usb_get_intfdata(interface);
 995
 996         if (hif_dev) {
 997                 ath9k_htc_hw_deinit(hif_dev->htc_handle,
 998                     (udev->state == USB_STATE_NOTATTACHED) ? true : false);
 999                 ath9k_htc_hw_free(hif_dev->htc_handle);
1000                 ath9k_hif_usb_dev_deinit(hif_dev);
1001                 usb_set_intfdata(interface, NULL);
1002         }
1003
1004         if (hif_dev->flags & HIF_USB_START)
1005                 ath9k_hif_usb_reboot(udev);
1006
1007         kfree(hif_dev);
1008         dev_info(&udev->dev, "ath9k_htc: USB layer deinitialized\n");
1009         usb_put_dev(udev);
1010 }
1011
1012 #ifdef CONFIG_PM
1013 static int ath9k_hif_usb_suspend(struct usb_interface *interface,
1014                                  pm_message_t message)
1015 {
1016         struct hif_device_usb *hif_dev = usb_get_intfdata(interface);
1017
1018         /*
1019          * The device has to be set to FULLSLEEP mode in case no
1020          * interface is up.
1021          */
1022         if (!(hif_dev->flags & HIF_USB_START))
1023                 ath9k_htc_suspend(hif_dev->htc_handle);
1024
1025         ath9k_hif_usb_dealloc_urbs(hif_dev);
1026
1027         return 0;
1028 }
1029
1030 static int ath9k_hif_usb_resume(struct usb_interface *interface)
1031 {
1032         struct hif_device_usb *hif_dev = usb_get_intfdata(interface);
1033         struct htc_target *htc_handle = hif_dev->htc_handle;
1034         int ret;
1035
1036         ret = ath9k_hif_usb_alloc_urbs(hif_dev);
1037         if (ret)
1038                 return ret;
1039
1040         if (hif_dev->firmware) {
1041                 ret = ath9k_hif_usb_download_fw(hif_dev,
1042                                 htc_handle->drv_priv->ah->hw_version.usbdev);
1043                 if (ret)
1044                         goto fail_resume;
1045         } else {
1046                 ath9k_hif_usb_dealloc_urbs(hif_dev);
1047                 return -EIO;
1048         }
1049
1050         mdelay(100);
1051
1052         ret = ath9k_htc_resume(htc_handle);
1053
1054         if (ret)
1055                 goto fail_resume;
1056
1057         return 0;
1058
1059 fail_resume:
1060         ath9k_hif_usb_dealloc_urbs(hif_dev);
1061
1062         return ret;
1063 }
1064 #endif
1065
1066 static struct usb_driver ath9k_hif_usb_driver = {
1067         .name = "ath9k_hif_usb",
1068         .probe = ath9k_hif_usb_probe,
1069         .disconnect = ath9k_hif_usb_disconnect,
1070 #ifdef CONFIG_PM
1071         .suspend = ath9k_hif_usb_suspend,
1072         .resume = ath9k_hif_usb_resume,
1073         .reset_resume = ath9k_hif_usb_resume,
1074 #endif
1075         .id_table = ath9k_hif_usb_ids,
1076         .soft_unbind = 1,
1077 };
1078
1079 int ath9k_hif_usb_init(void)
1080 {
1081         return usb_register(&ath9k_hif_usb_driver);
1082 }
1083
1084 void ath9k_hif_usb_exit(void)
1085 {
1086         usb_deregister(&ath9k_hif_usb_driver);
1087 }