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

   1 /*
   2  * Copyright (c) 2010 Atheros Communications Inc.
   3  *
   4  * Permission to use, copy, modify, and/or distribute this software for any
   5  * purpose with or without fee is hereby granted, provided that the above
   6  * copyright notice and this permission notice appear in all copies.
   7  *
   8  * THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL WARRANTIES
   9  * WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF
  10  * MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR
  11  * ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES
  12  * WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN
  13  * ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF
  14  * OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
  15  */
  16
  17 #include "htc.h"
  18
  19 /* identify firmware images */
  20 #define FIRMWARE_AR7010         "ar7010.fw"
  21 #define FIRMWARE_AR7010_1_1     "ar7010_1_1.fw"
  22 #define FIRMWARE_AR9271         "ar9271.fw"
  23
  24 MODULE_FIRMWARE(FIRMWARE_AR7010);
  25 MODULE_FIRMWARE(FIRMWARE_AR7010_1_1);
  26 MODULE_FIRMWARE(FIRMWARE_AR9271);
  27
  28 static struct usb_device_id ath9k_hif_usb_ids[] = {
  29         { USB_DEVICE(0x0cf3, 0x9271) }, /* Atheros */
  30         { USB_DEVICE(0x0cf3, 0x1006) }, /* Atheros */
  31         { USB_DEVICE(0x0cf3, 0x7010) }, /* Atheros */
  32         { USB_DEVICE(0x0cf3, 0x7015) }, /* Atheros */
  33         { USB_DEVICE(0x0846, 0x9030) }, /* Netgear N150 */
  34         { USB_DEVICE(0x0846, 0x9018) }, /* Netgear WNDA3200 */
  35         { USB_DEVICE(0x07D1, 0x3A10) }, /* Dlink Wireless 150 */
  36         { USB_DEVICE(0x13D3, 0x3327) }, /* Azurewave */
  37         { USB_DEVICE(0x13D3, 0x3328) }, /* Azurewave */
  38         { USB_DEVICE(0x04CA, 0x4605) }, /* Liteon */
  39         { USB_DEVICE(0x083A, 0xA704) }, /* SMC Networks */
  40         { },
  41 };
  42
  43 MODULE_DEVICE_TABLE(usb, ath9k_hif_usb_ids);
  44
  45 static int __hif_usb_tx(struct hif_device_usb *hif_dev);
  46
  47 static void hif_usb_regout_cb(struct urb *urb)
  48 {
  49         struct cmd_buf *cmd = (struct cmd_buf *)urb->context;
  50
  51         switch (urb->status) {
  52         case 0:
  53                 break;
  54         case -ENOENT:
  55         case -ECONNRESET:
  56         case -ENODEV:
  57         case -ESHUTDOWN:
  58                 goto free;
  59         default:
  60                 break;
  61         }
  62
  63         if (cmd) {
  64                 ath9k_htc_txcompletion_cb(cmd->hif_dev->htc_handle,
  65                                           cmd->skb, 1);
  66                 kfree(cmd);
  67         }
  68
  69         return;
  70 free:
  71         kfree_skb(cmd->skb);
  72         kfree(cmd);
  73 }
  74
  75 static int hif_usb_send_regout(struct hif_device_usb *hif_dev,
  76                                struct sk_buff *skb)
  77 {
  78         struct urb *urb;
  79         struct cmd_buf *cmd;
  80         int ret = 0;
  81
  82         urb = usb_alloc_urb(0, GFP_KERNEL);
  83         if (urb == NULL)
  84                 return -ENOMEM;
  85
  86         cmd = kzalloc(sizeof(*cmd), GFP_KERNEL);
  87         if (cmd == NULL) {
  88                 usb_free_urb(urb);
  89                 return -ENOMEM;
  90         }
  91
  92         cmd->skb = skb;
  93         cmd->hif_dev = hif_dev;
  94
  95         usb_fill_bulk_urb(urb, hif_dev->udev,
  96                          usb_sndbulkpipe(hif_dev->udev, USB_REG_OUT_PIPE),
  97                          skb->data, skb->len,
  98                          hif_usb_regout_cb, cmd);
  99
 100         usb_anchor_urb(urb, &hif_dev->regout_submitted);
 101         ret = usb_submit_urb(urb, GFP_KERNEL);
 102         if (ret) {
 103                 usb_unanchor_urb(urb);
 104                 kfree(cmd);
 105         }
 106         usb_free_urb(urb);
 107
 108         return ret;
 109 }
 110
 111 static inline void ath9k_skb_queue_purge(struct hif_device_usb *hif_dev,
 112                                          struct sk_buff_head *list)
 113 {
 114         struct sk_buff *skb;
 115
 116         while ((skb = __skb_dequeue(list)) != NULL) {
 117                 dev_kfree_skb_any(skb);
 118                 TX_STAT_INC(skb_dropped);
 119         }
 120 }
 121
 122 static void hif_usb_tx_cb(struct urb *urb)
 123 {
 124         struct tx_buf *tx_buf = (struct tx_buf *) urb->context;
 125         struct hif_device_usb *hif_dev;
 126         struct sk_buff *skb;
 127
 128         if (!tx_buf || !tx_buf->hif_dev)
 129                 return;
 130
 131         hif_dev = tx_buf->hif_dev;
 132
 133         switch (urb->status) {
 134         case 0:
 135                 break;
 136         case -ENOENT:
 137         case -ECONNRESET:
 138         case -ENODEV:
 139         case -ESHUTDOWN:
 140                 /*
 141                  * The URB has been killed, free the SKBs
 142                  * and return.
 143                  */
 144                 ath9k_skb_queue_purge(hif_dev, &tx_buf->skb_queue);
 145                 return;
 146         default:
 147                 break;
 148         }
 149
 150         /* Check if TX has been stopped */
 151         spin_lock(&hif_dev->tx.tx_lock);
 152         if (hif_dev->tx.flags & HIF_USB_TX_STOP) {
 153                 spin_unlock(&hif_dev->tx.tx_lock);
 154                 ath9k_skb_queue_purge(hif_dev, &tx_buf->skb_queue);
 155                 goto add_free;
 156         }
 157         spin_unlock(&hif_dev->tx.tx_lock);
 158
 159         /* Complete the queued SKBs. */
 160         while ((skb = __skb_dequeue(&tx_buf->skb_queue)) != NULL) {
 161                 ath9k_htc_txcompletion_cb(hif_dev->htc_handle,
 162                                           skb, 1);
 163                 TX_STAT_INC(skb_completed);
 164         }
 165
 166 add_free:
 167         /* Re-initialize the SKB queue */
 168         tx_buf->len = tx_buf->offset = 0;
 169         __skb_queue_head_init(&tx_buf->skb_queue);
 170
 171         /* Add this TX buffer to the free list */
 172         spin_lock(&hif_dev->tx.tx_lock);
 173         list_move_tail(&tx_buf->list, &hif_dev->tx.tx_buf);
 174         hif_dev->tx.tx_buf_cnt++;
 175         if (!(hif_dev->tx.flags & HIF_USB_TX_STOP))
 176                 __hif_usb_tx(hif_dev); /* Check for pending SKBs */
 177         TX_STAT_INC(buf_completed);
 178         spin_unlock(&hif_dev->tx.tx_lock);
 179 }
 180
 181 /* TX lock has to be taken */
 182 static int __hif_usb_tx(struct hif_device_usb *hif_dev)
 183 {
 184         struct tx_buf *tx_buf = NULL;
 185         struct sk_buff *nskb = NULL;
 186         int ret = 0, i;
 187         u16 *hdr, tx_skb_cnt = 0;
 188         u8 *buf;
 189
 190         if (hif_dev->tx.tx_skb_cnt == 0)
 191                 return 0;
 192
 193         /* Check if a free TX buffer is available */
 194         if (list_empty(&hif_dev->tx.tx_buf))
 195                 return 0;
 196
 197         tx_buf = list_first_entry(&hif_dev->tx.tx_buf, struct tx_buf, list);
 198         list_move_tail(&tx_buf->list, &hif_dev->tx.tx_pending);
 199         hif_dev->tx.tx_buf_cnt--;
 200
 201         tx_skb_cnt = min_t(u16, hif_dev->tx.tx_skb_cnt, MAX_TX_AGGR_NUM);
 202
 203         for (i = 0; i < tx_skb_cnt; i++) {
 204                 nskb = __skb_dequeue(&hif_dev->tx.tx_skb_queue);
 205
 206                 /* Should never be NULL */
 207                 BUG_ON(!nskb);
 208
 209                 hif_dev->tx.tx_skb_cnt--;
 210
 211                 buf = tx_buf->buf;
 212                 buf += tx_buf->offset;
 213                 hdr = (u16 *)buf;
 214                 *hdr++ = nskb->len;
 215                 *hdr++ = ATH_USB_TX_STREAM_MODE_TAG;
 216                 buf += 4;
 217                 memcpy(buf, nskb->data, nskb->len);
 218                 tx_buf->len = nskb->len + 4;
 219
 220                 if (i < (tx_skb_cnt - 1))
 221                         tx_buf->offset += (((tx_buf->len - 1) / 4) + 1) * 4;
 222
 223                 if (i == (tx_skb_cnt - 1))
 224                         tx_buf->len += tx_buf->offset;
 225
 226                 __skb_queue_tail(&tx_buf->skb_queue, nskb);
 227                 TX_STAT_INC(skb_queued);
 228         }
 229
 230         usb_fill_bulk_urb(tx_buf->urb, hif_dev->udev,
 231                           usb_sndbulkpipe(hif_dev->udev, USB_WLAN_TX_PIPE),
 232                           tx_buf->buf, tx_buf->len,
 233                           hif_usb_tx_cb, tx_buf);
 234
 235         ret = usb_submit_urb(tx_buf->urb, GFP_ATOMIC);
 236         if (ret) {
 237                 tx_buf->len = tx_buf->offset = 0;
 238                 ath9k_skb_queue_purge(hif_dev, &tx_buf->skb_queue);
 239                 __skb_queue_head_init(&tx_buf->skb_queue);
 240                 list_move_tail(&tx_buf->list, &hif_dev->tx.tx_buf);
 241                 hif_dev->tx.tx_buf_cnt++;
 242         }
 243
 244         if (!ret)
 245                 TX_STAT_INC(buf_queued);
 246
 247         return ret;
 248 }
 249
 250 static int hif_usb_send_tx(struct hif_device_usb *hif_dev, struct sk_buff *skb,
 251                            struct ath9k_htc_tx_ctl *tx_ctl)
 252 {
 253         unsigned long flags;
 254
 255         spin_lock_irqsave(&hif_dev->tx.tx_lock, flags);
 256
 257         if (hif_dev->tx.flags & HIF_USB_TX_STOP) {
 258                 spin_unlock_irqrestore(&hif_dev->tx.tx_lock, flags);
 259                 return -ENODEV;
 260         }
 261
 262         /* Check if the max queue count has been reached */
 263         if (hif_dev->tx.tx_skb_cnt > MAX_TX_BUF_NUM) {
 264                 spin_unlock_irqrestore(&hif_dev->tx.tx_lock, flags);
 265                 return -ENOMEM;
 266         }
 267
 268         __skb_queue_tail(&hif_dev->tx.tx_skb_queue, skb);
 269         hif_dev->tx.tx_skb_cnt++;
 270
 271         /* Send normal frames immediately */
 272         if (!tx_ctl || (tx_ctl && (tx_ctl->type == ATH9K_HTC_NORMAL)))
 273                 __hif_usb_tx(hif_dev);
 274
 275         /* Check if AMPDUs have to be sent immediately */
 276         if (tx_ctl && (tx_ctl->type == ATH9K_HTC_AMPDU) &&
 277             (hif_dev->tx.tx_buf_cnt == MAX_TX_URB_NUM) &&
 278             (hif_dev->tx.tx_skb_cnt < 2)) {
 279                 __hif_usb_tx(hif_dev);
 280         }
 281
 282         spin_unlock_irqrestore(&hif_dev->tx.tx_lock, flags);
 283
 284         return 0;
 285 }
 286
 287 static void hif_usb_start(void *hif_handle, u8 pipe_id)
 288 {
 289         struct hif_device_usb *hif_dev = (struct hif_device_usb *)hif_handle;
 290         unsigned long flags;
 291
 292         hif_dev->flags |= HIF_USB_START;
 293
 294         spin_lock_irqsave(&hif_dev->tx.tx_lock, flags);
 295         hif_dev->tx.flags &= ~HIF_USB_TX_STOP;
 296         spin_unlock_irqrestore(&hif_dev->tx.tx_lock, flags);
 297 }
 298
 299 static void hif_usb_stop(void *hif_handle, u8 pipe_id)
 300 {
 301         struct hif_device_usb *hif_dev = (struct hif_device_usb *)hif_handle;
 302         unsigned long flags;
 303
 304         spin_lock_irqsave(&hif_dev->tx.tx_lock, flags);
 305         ath9k_skb_queue_purge(hif_dev, &hif_dev->tx.tx_skb_queue);
 306         hif_dev->tx.tx_skb_cnt = 0;
 307         hif_dev->tx.flags |= HIF_USB_TX_STOP;
 308         spin_unlock_irqrestore(&hif_dev->tx.tx_lock, flags);
 309 }
 310
 311 static int hif_usb_send(void *hif_handle, u8 pipe_id, struct sk_buff *skb,
 312                         struct ath9k_htc_tx_ctl *tx_ctl)
 313 {
 314         struct hif_device_usb *hif_dev = (struct hif_device_usb *)hif_handle;
 315         int ret = 0;
 316
 317         switch (pipe_id) {
 318         case USB_WLAN_TX_PIPE:
 319                 ret = hif_usb_send_tx(hif_dev, skb, tx_ctl);
 320                 break;
 321         case USB_REG_OUT_PIPE:
 322                 ret = hif_usb_send_regout(hif_dev, skb);
 323                 break;
 324         default:
 325                 dev_err(&hif_dev->udev->dev,
 326                         "ath9k_htc: Invalid TX pipe: %d\n", pipe_id);
 327                 ret = -EINVAL;
 328                 break;
 329         }
 330
 331         return ret;
 332 }
 333
 334 static struct ath9k_htc_hif hif_usb = {
 335         .transport = ATH9K_HIF_USB,
 336         .name = "ath9k_hif_usb",
 337
 338         .control_ul_pipe = USB_REG_OUT_PIPE,
 339         .control_dl_pipe = USB_REG_IN_PIPE,
 340
 341         .start = hif_usb_start,
 342         .stop = hif_usb_stop,
 343         .send = hif_usb_send,
 344 };
 345
 346 static void ath9k_hif_usb_rx_stream(struct hif_device_usb *hif_dev,
 347                                     struct sk_buff *skb)
 348 {
 349         struct sk_buff *nskb, *skb_pool[MAX_PKT_NUM_IN_TRANSFER];
 350         int index = 0, i = 0, chk_idx, len = skb->len;
 351         int rx_remain_len = 0, rx_pkt_len = 0;
 352         u16 pkt_len, pkt_tag, pool_index = 0;
 353         u8 *ptr;
 354
 355         spin_lock(&hif_dev->rx_lock);
 356
 357         rx_remain_len = hif_dev->rx_remain_len;
 358         rx_pkt_len = hif_dev->rx_transfer_len;
 359
 360         if (rx_remain_len != 0) {
 361                 struct sk_buff *remain_skb = hif_dev->remain_skb;
 362
 363                 if (remain_skb) {
 364                         ptr = (u8 *) remain_skb->data;
 365
 366                         index = rx_remain_len;
 367                         rx_remain_len -= hif_dev->rx_pad_len;
 368                         ptr += rx_pkt_len;
 369
 370                         memcpy(ptr, skb->data, rx_remain_len);
 371
 372                         rx_pkt_len += rx_remain_len;
 373                         hif_dev->rx_remain_len = 0;
 374                         skb_put(remain_skb, rx_pkt_len);
 375
 376                         skb_pool[pool_index++] = remain_skb;
 377
 378                 } else {
 379                         index = rx_remain_len;
 380                 }
 381         }
 382
 383         spin_unlock(&hif_dev->rx_lock);
 384
 385         while (index < len) {
 386                 ptr = (u8 *) skb->data;
 387
 388                 pkt_len = ptr[index] + (ptr[index+1] << 8);
 389                 pkt_tag = ptr[index+2] + (ptr[index+3] << 8);
 390
 391                 if (pkt_tag == ATH_USB_RX_STREAM_MODE_TAG) {
 392                         u16 pad_len;
 393
 394                         pad_len = 4 - (pkt_len & 0x3);
 395                         if (pad_len == 4)
 396                                 pad_len = 0;
 397
 398                         chk_idx = index;
 399                         index = index + 4 + pkt_len + pad_len;
 400
 401                         if (index > MAX_RX_BUF_SIZE) {
 402                                 spin_lock(&hif_dev->rx_lock);
 403                                 hif_dev->rx_remain_len = index - MAX_RX_BUF_SIZE;
 404                                 hif_dev->rx_transfer_len =
 405                                         MAX_RX_BUF_SIZE - chk_idx - 4;
 406                                 hif_dev->rx_pad_len = pad_len;
 407
 408                                 nskb = __dev_alloc_skb(pkt_len + 32,
 409                                                        GFP_ATOMIC);
 410                                 if (!nskb) {
 411                                         dev_err(&hif_dev->udev->dev,
 412                                         "ath9k_htc: RX memory allocation"
 413                                         " error\n");
 414                                         spin_unlock(&hif_dev->rx_lock);
 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]),
 421                                        hif_dev->rx_transfer_len);
 422
 423                                 /* Record the buffer pointer */
 424                                 hif_dev->remain_skb = nskb;
 425                                 spin_unlock(&hif_dev->rx_lock);
 426                         } else {
 427                                 nskb = __dev_alloc_skb(pkt_len + 32, GFP_ATOMIC);
 428                                 if (!nskb) {
 429                                         dev_err(&hif_dev->udev->dev,
 430                                         "ath9k_htc: RX memory allocation"
 431                                         " error\n");
 432                                         goto err;
 433                                 }
 434                                 skb_reserve(nskb, 32);
 435                                 RX_STAT_INC(skb_allocated);
 436
 437                                 memcpy(nskb->data, &(skb->data[chk_idx+4]), pkt_len);
 438                                 skb_put(nskb, pkt_len);
 439                                 skb_pool[pool_index++] = nskb;
 440                         }
 441                 } else {
 442                         RX_STAT_INC(skb_dropped);
 443                         return;
 444                 }
 445         }
 446
 447 err:
 448         for (i = 0; i < pool_index; i++) {
 449                 ath9k_htc_rx_msg(hif_dev->htc_handle, skb_pool[i],
 450                                  skb_pool[i]->len, USB_WLAN_RX_PIPE);
 451                 RX_STAT_INC(skb_completed);
 452         }
 453 }
 454
 455 static void ath9k_hif_usb_rx_cb(struct urb *urb)
 456 {
 457         struct sk_buff *skb = (struct sk_buff *) urb->context;
 458         struct hif_device_usb *hif_dev = (struct hif_device_usb *)
 459                 usb_get_intfdata(usb_ifnum_to_if(urb->dev, 0));
 460         int ret;
 461
 462         if (!skb)
 463                 return;
 464
 465         if (!hif_dev)
 466                 goto free;
 467
 468         switch (urb->status) {
 469         case 0:
 470                 break;
 471         case -ENOENT:
 472         case -ECONNRESET:
 473         case -ENODEV:
 474         case -ESHUTDOWN:
 475                 goto free;
 476         default:
 477                 goto resubmit;
 478         }
 479
 480         if (likely(urb->actual_length != 0)) {
 481                 skb_put(skb, urb->actual_length);
 482                 ath9k_hif_usb_rx_stream(hif_dev, skb);
 483         }
 484
 485 resubmit:
 486         skb_reset_tail_pointer(skb);
 487         skb_trim(skb, 0);
 488
 489         usb_anchor_urb(urb, &hif_dev->rx_submitted);
 490         ret = usb_submit_urb(urb, GFP_ATOMIC);
 491         if (ret) {
 492                 usb_unanchor_urb(urb);
 493                 goto free;
 494         }
 495
 496         return;
 497 free:
 498         kfree_skb(skb);
 499 }
 500
 501 static void ath9k_hif_usb_reg_in_cb(struct urb *urb)
 502 {
 503         struct sk_buff *skb = (struct sk_buff *) urb->context;
 504         struct sk_buff *nskb;
 505         struct hif_device_usb *hif_dev = (struct hif_device_usb *)
 506                 usb_get_intfdata(usb_ifnum_to_if(urb->dev, 0));
 507         int ret;
 508
 509         if (!skb)
 510                 return;
 511
 512         if (!hif_dev)
 513                 goto free;
 514
 515         switch (urb->status) {
 516         case 0:
 517                 break;
 518         case -ENOENT:
 519         case -ECONNRESET:
 520         case -ENODEV:
 521         case -ESHUTDOWN:
 522                 goto free;
 523         default:
 524                 goto resubmit;
 525         }
 526
 527         if (likely(urb->actual_length != 0)) {
 528                 skb_put(skb, urb->actual_length);
 529
 530                 /* Process the command first */
 531                 ath9k_htc_rx_msg(hif_dev->htc_handle, skb,
 532                                  skb->len, USB_REG_IN_PIPE);
 533
 534
 535                 nskb = alloc_skb(MAX_REG_IN_BUF_SIZE, GFP_ATOMIC);
 536                 if (!nskb) {
 537                         dev_err(&hif_dev->udev->dev,
 538                                 "ath9k_htc: REG_IN memory allocation failure\n");
 539                         urb->context = NULL;
 540                         return;
 541                 }
 542
 543                 usb_fill_int_urb(urb, hif_dev->udev,
 544                                  usb_rcvbulkpipe(hif_dev->udev,
 545                                                  USB_REG_IN_PIPE),
 546                                  nskb->data, MAX_REG_IN_BUF_SIZE,
 547                                  ath9k_hif_usb_reg_in_cb, nskb, 1);
 548
 549                 ret = usb_submit_urb(urb, GFP_ATOMIC);
 550                 if (ret) {
 551                         kfree_skb(nskb);
 552                         urb->context = NULL;
 553                 }
 554
 555                 return;
 556         }
 557
 558 resubmit:
 559         skb_reset_tail_pointer(skb);
 560         skb_trim(skb, 0);
 561
 562         ret = usb_submit_urb(urb, GFP_ATOMIC);
 563         if (ret)
 564                 goto free;
 565
 566         return;
 567 free:
 568         kfree_skb(skb);
 569         urb->context = NULL;
 570 }
 571
 572 static void ath9k_hif_usb_dealloc_tx_urbs(struct hif_device_usb *hif_dev)
 573 {
 574         struct tx_buf *tx_buf = NULL, *tx_buf_tmp = NULL;
 575
 576         list_for_each_entry_safe(tx_buf, tx_buf_tmp,
 577                                  &hif_dev->tx.tx_buf, list) {
 578                 usb_kill_urb(tx_buf->urb);
 579                 list_del(&tx_buf->list);
 580                 usb_free_urb(tx_buf->urb);
 581                 kfree(tx_buf->buf);
 582                 kfree(tx_buf);
 583         }
 584
 585         list_for_each_entry_safe(tx_buf, tx_buf_tmp,
 586                                  &hif_dev->tx.tx_pending, list) {
 587                 usb_kill_urb(tx_buf->urb);
 588                 list_del(&tx_buf->list);
 589                 usb_free_urb(tx_buf->urb);
 590                 kfree(tx_buf->buf);
 591                 kfree(tx_buf);
 592         }
 593 }
 594
 595 static int ath9k_hif_usb_alloc_tx_urbs(struct hif_device_usb *hif_dev)
 596 {
 597         struct tx_buf *tx_buf;
 598         int i;
 599
 600         INIT_LIST_HEAD(&hif_dev->tx.tx_buf);
 601         INIT_LIST_HEAD(&hif_dev->tx.tx_pending);
 602         spin_lock_init(&hif_dev->tx.tx_lock);
 603         __skb_queue_head_init(&hif_dev->tx.tx_skb_queue);
 604
 605         for (i = 0; i < MAX_TX_URB_NUM; i++) {
 606                 tx_buf = kzalloc(sizeof(struct tx_buf), GFP_KERNEL);
 607                 if (!tx_buf)
 608                         goto err;
 609
 610                 tx_buf->buf = kzalloc(MAX_TX_BUF_SIZE, GFP_KERNEL);
 611                 if (!tx_buf->buf)
 612                         goto err;
 613
 614                 tx_buf->urb = usb_alloc_urb(0, GFP_KERNEL);
 615                 if (!tx_buf->urb)
 616                         goto err;
 617
 618                 tx_buf->hif_dev = hif_dev;
 619                 __skb_queue_head_init(&tx_buf->skb_queue);
 620
 621                 list_add_tail(&tx_buf->list, &hif_dev->tx.tx_buf);
 622         }
 623
 624         hif_dev->tx.tx_buf_cnt = MAX_TX_URB_NUM;
 625
 626         return 0;
 627 err:
 628         if (tx_buf) {
 629                 kfree(tx_buf->buf);
 630                 kfree(tx_buf);
 631         }
 632         ath9k_hif_usb_dealloc_tx_urbs(hif_dev);
 633         return -ENOMEM;
 634 }
 635
 636 static void ath9k_hif_usb_dealloc_rx_urbs(struct hif_device_usb *hif_dev)
 637 {
 638         usb_kill_anchored_urbs(&hif_dev->rx_submitted);
 639 }
 640
 641 static int ath9k_hif_usb_alloc_rx_urbs(struct hif_device_usb *hif_dev)
 642 {
 643         struct urb *urb = NULL;
 644         struct sk_buff *skb = NULL;
 645         int i, ret;
 646
 647         init_usb_anchor(&hif_dev->rx_submitted);
 648         spin_lock_init(&hif_dev->rx_lock);
 649
 650         for (i = 0; i < MAX_RX_URB_NUM; i++) {
 651
 652                 /* Allocate URB */
 653                 urb = usb_alloc_urb(0, GFP_KERNEL);
 654                 if (urb == NULL) {
 655                         ret = -ENOMEM;
 656                         goto err_urb;
 657                 }
 658
 659                 /* Allocate buffer */
 660                 skb = alloc_skb(MAX_RX_BUF_SIZE, GFP_KERNEL);
 661                 if (!skb) {
 662                         ret = -ENOMEM;
 663                         goto err_skb;
 664                 }
 665
 666                 usb_fill_bulk_urb(urb, hif_dev->udev,
 667                                   usb_rcvbulkpipe(hif_dev->udev,
 668                                                   USB_WLAN_RX_PIPE),
 669                                   skb->data, MAX_RX_BUF_SIZE,
 670                                   ath9k_hif_usb_rx_cb, skb);
 671
 672                 /* Anchor URB */
 673                 usb_anchor_urb(urb, &hif_dev->rx_submitted);
 674
 675                 /* Submit URB */
 676                 ret = usb_submit_urb(urb, GFP_KERNEL);
 677                 if (ret) {
 678                         usb_unanchor_urb(urb);
 679                         goto err_submit;
 680                 }
 681
 682                 /*
 683                  * Drop reference count.
 684                  * This ensures that the URB is freed when killing them.
 685                  */
 686                 usb_free_urb(urb);
 687         }
 688
 689         return 0;
 690
 691 err_submit:
 692         kfree_skb(skb);
 693 err_skb:
 694         usb_free_urb(urb);
 695 err_urb:
 696         ath9k_hif_usb_dealloc_rx_urbs(hif_dev);
 697         return ret;
 698 }
 699
 700 static void ath9k_hif_usb_dealloc_reg_in_urb(struct hif_device_usb *hif_dev)
 701 {
 702         if (hif_dev->reg_in_urb) {
 703                 usb_kill_urb(hif_dev->reg_in_urb);
 704                 if (hif_dev->reg_in_urb->context)
 705                         kfree_skb((void *)hif_dev->reg_in_urb->context);
 706                 usb_free_urb(hif_dev->reg_in_urb);
 707                 hif_dev->reg_in_urb = NULL;
 708         }
 709 }
 710
 711 static int ath9k_hif_usb_alloc_reg_in_urb(struct hif_device_usb *hif_dev)
 712 {
 713         struct sk_buff *skb;
 714
 715         hif_dev->reg_in_urb = usb_alloc_urb(0, GFP_KERNEL);
 716         if (hif_dev->reg_in_urb == NULL)
 717                 return -ENOMEM;
 718
 719         skb = alloc_skb(MAX_REG_IN_BUF_SIZE, GFP_KERNEL);
 720         if (!skb)
 721                 goto err;
 722
 723         usb_fill_int_urb(hif_dev->reg_in_urb, hif_dev->udev,
 724                          usb_rcvbulkpipe(hif_dev->udev,
 725                                          USB_REG_IN_PIPE),
 726                          skb->data, MAX_REG_IN_BUF_SIZE,
 727                          ath9k_hif_usb_reg_in_cb, skb, 1);
 728
 729         if (usb_submit_urb(hif_dev->reg_in_urb, GFP_KERNEL) != 0)
 730                 goto err;
 731
 732         return 0;
 733
 734 err:
 735         ath9k_hif_usb_dealloc_reg_in_urb(hif_dev);
 736         return -ENOMEM;
 737 }
 738
 739 static int ath9k_hif_usb_alloc_urbs(struct hif_device_usb *hif_dev)
 740 {
 741         /* Register Write */
 742         init_usb_anchor(&hif_dev->regout_submitted);
 743
 744         /* TX */
 745         if (ath9k_hif_usb_alloc_tx_urbs(hif_dev) < 0)
 746                 goto err;
 747
 748         /* RX */
 749         if (ath9k_hif_usb_alloc_rx_urbs(hif_dev) < 0)
 750                 goto err_rx;
 751
 752         /* Register Read */
 753         if (ath9k_hif_usb_alloc_reg_in_urb(hif_dev) < 0)
 754                 goto err_reg;
 755
 756         return 0;
 757 err_reg:
 758         ath9k_hif_usb_dealloc_rx_urbs(hif_dev);
 759 err_rx:
 760         ath9k_hif_usb_dealloc_tx_urbs(hif_dev);
 761 err:
 762         return -ENOMEM;
 763 }
 764
 765 static void ath9k_hif_usb_dealloc_urbs(struct hif_device_usb *hif_dev)
 766 {
 767         usb_kill_anchored_urbs(&hif_dev->regout_submitted);
 768         ath9k_hif_usb_dealloc_reg_in_urb(hif_dev);
 769         ath9k_hif_usb_dealloc_tx_urbs(hif_dev);
 770         ath9k_hif_usb_dealloc_rx_urbs(hif_dev);
 771 }
 772
 773 static int ath9k_hif_usb_download_fw(struct hif_device_usb *hif_dev)
 774 {
 775         int transfer, err;
 776         const void *data = hif_dev->firmware->data;
 777         size_t len = hif_dev->firmware->size;
 778         u32 addr = AR9271_FIRMWARE;
 779         u8 *buf = kzalloc(4096, GFP_KERNEL);
 780         u32 firm_offset;
 781
 782         if (!buf)
 783                 return -ENOMEM;
 784
 785         while (len) {
 786                 transfer = min_t(int, len, 4096);
 787                 memcpy(buf, data, transfer);
 788
 789                 err = usb_control_msg(hif_dev->udev,
 790                                       usb_sndctrlpipe(hif_dev->udev, 0),
 791                                       FIRMWARE_DOWNLOAD, 0x40 | USB_DIR_OUT,
 792                                       addr >> 8, 0, buf, transfer, HZ);
 793                 if (err < 0) {
 794                         kfree(buf);
 795                         return err;
 796                 }
 797
 798                 len -= transfer;
 799                 data += transfer;
 800                 addr += transfer;
 801         }
 802         kfree(buf);
 803
 804         switch (hif_dev->device_id) {
 805         case 0x7010:
 806         case 0x7015:
 807         case 0x9018:
 808                 firm_offset = AR7010_FIRMWARE_TEXT;
 809                 break;
 810         default:
 811                 firm_offset = AR9271_FIRMWARE_TEXT;
 812                 break;
 813         }
 814
 815         /*
 816          * Issue FW download complete command to firmware.
 817          */
 818         err = usb_control_msg(hif_dev->udev, usb_sndctrlpipe(hif_dev->udev, 0),
 819                               FIRMWARE_DOWNLOAD_COMP,
 820                               0x40 | USB_DIR_OUT,
 821                               firm_offset >> 8, 0, NULL, 0, HZ);
 822         if (err)
 823                 return -EIO;
 824
 825         dev_info(&hif_dev->udev->dev, "ath9k_htc: Transferred FW: %s, size: %ld\n",
 826                  hif_dev->fw_name, (unsigned long) hif_dev->firmware->size);
 827
 828         return 0;
 829 }
 830
 831 static int ath9k_hif_usb_dev_init(struct hif_device_usb *hif_dev)
 832 {
 833         int ret, idx;
 834         struct usb_host_interface *alt = &hif_dev->interface->altsetting[0];
 835         struct usb_endpoint_descriptor *endp;
 836
 837         /* Request firmware */
 838         ret = request_firmware(&hif_dev->firmware, hif_dev->fw_name,
 839                                &hif_dev->udev->dev);
 840         if (ret) {
 841                 dev_err(&hif_dev->udev->dev,
 842                         "ath9k_htc: Firmware - %s not found\n", hif_dev->fw_name);
 843                 goto err_fw_req;
 844         }
 845
 846         /* Alloc URBs */
 847         ret = ath9k_hif_usb_alloc_urbs(hif_dev);
 848         if (ret) {
 849                 dev_err(&hif_dev->udev->dev,
 850                         "ath9k_htc: Unable to allocate URBs\n");
 851                 goto err_urb;
 852         }
 853
 854         /* Download firmware */
 855         ret = ath9k_hif_usb_download_fw(hif_dev);
 856         if (ret) {
 857                 dev_err(&hif_dev->udev->dev,
 858                         "ath9k_htc: Firmware - %s download failed\n",
 859                         hif_dev->fw_name);
 860                 goto err_fw_download;
 861         }
 862
 863         /* On downloading the firmware to the target, the USB descriptor of EP4
 864          * is 'patched' to change the type of the endpoint to Bulk. This will
 865          * bring down CPU usage during the scan period.
 866          */
 867         for (idx = 0; idx < alt->desc.bNumEndpoints; idx++) {
 868                 endp = &alt->endpoint[idx].desc;
 869                 if (((endp->bEndpointAddress & USB_ENDPOINT_NUMBER_MASK)
 870                                 == 0x04) &&
 871                     ((endp->bmAttributes & USB_ENDPOINT_XFERTYPE_MASK)
 872                                 == USB_ENDPOINT_XFER_INT)) {
 873                         endp->bmAttributes &= ~USB_ENDPOINT_XFERTYPE_MASK;
 874                         endp->bmAttributes |= USB_ENDPOINT_XFER_BULK;
 875                         endp->bInterval = 0;
 876                 }
 877         }
 878
 879         return 0;
 880
 881 err_fw_download:
 882         ath9k_hif_usb_dealloc_urbs(hif_dev);
 883 err_urb:
 884         release_firmware(hif_dev->firmware);
 885 err_fw_req:
 886         hif_dev->firmware = NULL;
 887         return ret;
 888 }
 889
 890 static void ath9k_hif_usb_dev_deinit(struct hif_device_usb *hif_dev)
 891 {
 892         ath9k_hif_usb_dealloc_urbs(hif_dev);
 893         if (hif_dev->firmware)
 894                 release_firmware(hif_dev->firmware);
 895 }
 896
 897 static int ath9k_hif_usb_probe(struct usb_interface *interface,
 898                                const struct usb_device_id *id)
 899 {
 900         struct usb_device *udev = interface_to_usbdev(interface);
 901         struct hif_device_usb *hif_dev;
 902         int ret = 0;
 903
 904         hif_dev = kzalloc(sizeof(struct hif_device_usb), GFP_KERNEL);
 905         if (!hif_dev) {
 906                 ret = -ENOMEM;
 907                 goto err_alloc;
 908         }
 909
 910         usb_get_dev(udev);
 911         hif_dev->udev = udev;
 912         hif_dev->interface = interface;
 913         hif_dev->device_id = id->idProduct;
 914 #ifdef CONFIG_PM
 915         udev->reset_resume = 1;
 916 #endif
 917         usb_set_intfdata(interface, hif_dev);
 918
 919         hif_dev->htc_handle = ath9k_htc_hw_alloc(hif_dev, &hif_usb,
 920                                                  &hif_dev->udev->dev);
 921         if (hif_dev->htc_handle == NULL) {
 922                 ret = -ENOMEM;
 923                 goto err_htc_hw_alloc;
 924         }
 925
 926         /* Find out which firmware to load */
 927
 928         switch(hif_dev->device_id) {
 929         case 0x7010:
 930         case 0x7015:
 931         case 0x9018:
 932                 if (le16_to_cpu(udev->descriptor.bcdDevice) == 0x0202)
 933                         hif_dev->fw_name = FIRMWARE_AR7010_1_1;
 934                 else
 935                         hif_dev->fw_name = FIRMWARE_AR7010;
 936                 break;
 937         default:
 938                 hif_dev->fw_name = FIRMWARE_AR9271;
 939                 break;
 940         }
 941
 942         ret = ath9k_hif_usb_dev_init(hif_dev);
 943         if (ret) {
 944                 ret = -EINVAL;
 945                 goto err_hif_init_usb;
 946         }
 947
 948         ret = ath9k_htc_hw_init(hif_dev->htc_handle,
 949                                 &hif_dev->udev->dev, hif_dev->device_id,
 950                                 hif_dev->udev->product);
 951         if (ret) {
 952                 ret = -EINVAL;
 953                 goto err_htc_hw_init;
 954         }
 955
 956         dev_info(&hif_dev->udev->dev, "ath9k_htc: USB layer initialized\n");
 957
 958         return 0;
 959
 960 err_htc_hw_init:
 961         ath9k_hif_usb_dev_deinit(hif_dev);
 962 err_hif_init_usb:
 963         ath9k_htc_hw_free(hif_dev->htc_handle);
 964 err_htc_hw_alloc:
 965         usb_set_intfdata(interface, NULL);
 966         kfree(hif_dev);
 967         usb_put_dev(udev);
 968 err_alloc:
 969         return ret;
 970 }
 971
 972 static void ath9k_hif_usb_reboot(struct usb_device *udev)
 973 {
 974         u32 reboot_cmd = 0xffffffff;
 975         void *buf;
 976         int ret;
 977
 978         buf = kmemdup(&reboot_cmd, 4, GFP_KERNEL);
 979         if (!buf)
 980                 return;
 981
 982         ret = usb_bulk_msg(udev, usb_sndbulkpipe(udev, USB_REG_OUT_PIPE),
 983                            buf, 4, NULL, HZ);
 984         if (ret)
 985                 dev_err(&udev->dev, "ath9k_htc: USB reboot failed\n");
 986
 987         kfree(buf);
 988 }
 989
 990 static void ath9k_hif_usb_disconnect(struct usb_interface *interface)
 991 {
 992         struct usb_device *udev = interface_to_usbdev(interface);
 993         struct hif_device_usb *hif_dev =
 994                 (struct hif_device_usb *) 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 =
1017                 (struct hif_device_usb *) usb_get_intfdata(interface);
1018
1019         ath9k_hif_usb_dealloc_urbs(hif_dev);
1020
1021         return 0;
1022 }
1023
1024 static int ath9k_hif_usb_resume(struct usb_interface *interface)
1025 {
1026         struct hif_device_usb *hif_dev =
1027                 (struct hif_device_usb *) usb_get_intfdata(interface);
1028         int ret;
1029
1030         ret = ath9k_hif_usb_alloc_urbs(hif_dev);
1031         if (ret)
1032                 return ret;
1033
1034         if (hif_dev->firmware) {
1035                 ret = ath9k_hif_usb_download_fw(hif_dev);
1036                 if (ret)
1037                         goto fail_resume;
1038         } else {
1039                 ath9k_hif_usb_dealloc_urbs(hif_dev);
1040                 return -EIO;
1041         }
1042
1043         mdelay(100);
1044
1045         ret = ath9k_htc_resume(hif_dev->htc_handle);
1046
1047         if (ret)
1048                 goto fail_resume;
1049
1050         return 0;
1051
1052 fail_resume:
1053         ath9k_hif_usb_dealloc_urbs(hif_dev);
1054
1055         return ret;
1056 }
1057 #endif
1058
1059 static struct usb_driver ath9k_hif_usb_driver = {
1060         .name = "ath9k_hif_usb",
1061         .probe = ath9k_hif_usb_probe,
1062         .disconnect = ath9k_hif_usb_disconnect,
1063 #ifdef CONFIG_PM
1064         .suspend = ath9k_hif_usb_suspend,
1065         .resume = ath9k_hif_usb_resume,
1066         .reset_resume = ath9k_hif_usb_resume,
1067 #endif
1068         .id_table = ath9k_hif_usb_ids,
1069         .soft_unbind = 1,
1070 };
1071
1072 int ath9k_hif_usb_init(void)
1073 {
1074         return usb_register(&ath9k_hif_usb_driver);
1075 }
1076
1077 void ath9k_hif_usb_exit(void)
1078 {
1079         usb_deregister(&ath9k_hif_usb_driver);
1080 }