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

   1 /*
   2  * Copyright (c) 2010-2011 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 <asm/unaligned.h>
  18 #include "htc.h"
  19
  20 MODULE_FIRMWARE(HTC_7010_MODULE_FW);
  21 MODULE_FIRMWARE(HTC_9271_MODULE_FW);
  22
  23 static const struct usb_device_id ath9k_hif_usb_ids[] = {
  24         { USB_DEVICE(0x0cf3, 0x9271) }, /* Atheros */
  25         { USB_DEVICE(0x0cf3, 0x1006) }, /* Atheros */
  26         { USB_DEVICE(0x0846, 0x9030) }, /* Netgear N150 */
  27         { USB_DEVICE(0x07b8, 0x9271) }, /* Altai WA1011N-GU */
  28         { USB_DEVICE(0x07D1, 0x3A10) }, /* Dlink Wireless 150 */
  29         { USB_DEVICE(0x13D3, 0x3327) }, /* Azurewave */
  30         { USB_DEVICE(0x13D3, 0x3328) }, /* Azurewave */
  31         { USB_DEVICE(0x13D3, 0x3346) }, /* IMC Networks */
  32         { USB_DEVICE(0x13D3, 0x3348) }, /* Azurewave */
  33         { USB_DEVICE(0x13D3, 0x3349) }, /* Azurewave */
  34         { USB_DEVICE(0x13D3, 0x3350) }, /* Azurewave */
  35         { USB_DEVICE(0x04CA, 0x4605) }, /* Liteon */
  36         { USB_DEVICE(0x040D, 0x3801) }, /* VIA */
  37         { USB_DEVICE(0x0cf3, 0xb003) }, /* Ubiquiti WifiStation Ext */
  38         { USB_DEVICE(0x0cf3, 0xb002) }, /* Ubiquiti WifiStation */
  39         { USB_DEVICE(0x057c, 0x8403) }, /* AVM FRITZ!WLAN 11N v2 USB */
  40         { USB_DEVICE(0x0471, 0x209e) }, /* Philips (or NXP) PTA01 */
  41         { USB_DEVICE(0x1eda, 0x2315) }, /* AirTies */
  42
  43         { USB_DEVICE(0x0cf3, 0x7015),
  44           .driver_info = AR9287_USB },  /* Atheros */
  45         { USB_DEVICE(0x1668, 0x1200),
  46           .driver_info = AR9287_USB },  /* Verizon */
  47
  48         { USB_DEVICE(0x0cf3, 0x7010),
  49           .driver_info = AR9280_USB },  /* Atheros */
  50         { USB_DEVICE(0x0846, 0x9018),
  51           .driver_info = AR9280_USB },  /* Netgear WNDA3200 */
  52         { USB_DEVICE(0x083A, 0xA704),
  53           .driver_info = AR9280_USB },  /* SMC Networks */
  54         { USB_DEVICE(0x0411, 0x017f),
  55           .driver_info = AR9280_USB },  /* Sony UWA-BR100 */
  56         { USB_DEVICE(0x0411, 0x0197),
  57           .driver_info = AR9280_USB },  /* Buffalo WLI-UV-AG300P */
  58         { USB_DEVICE(0x04da, 0x3904),
  59           .driver_info = AR9280_USB },
  60         { USB_DEVICE(0x0930, 0x0a08),
  61           .driver_info = AR9280_USB },  /* Toshiba WLM-20U2 and GN-1080 */
  62
  63         { USB_DEVICE(0x0cf3, 0x20ff),
  64           .driver_info = STORAGE_DEVICE },
  65
  66         { },
  67 };
  68
  69 MODULE_DEVICE_TABLE(usb, ath9k_hif_usb_ids);
  70
  71 static int __hif_usb_tx(struct hif_device_usb *hif_dev);
  72
  73 static void hif_usb_regout_cb(struct urb *urb)
  74 {
  75         struct cmd_buf *cmd = (struct cmd_buf *)urb->context;
  76
  77         switch (urb->status) {
  78         case 0:
  79                 break;
  80         case -ENOENT:
  81         case -ECONNRESET:
  82         case -ENODEV:
  83         case -ESHUTDOWN:
  84                 goto free;
  85         default:
  86                 break;
  87         }
  88
  89         if (cmd) {
  90                 ath9k_htc_txcompletion_cb(cmd->hif_dev->htc_handle,
  91                                           cmd->skb, true);
  92                 kfree(cmd);
  93         }
  94
  95         return;
  96 free:
  97         kfree_skb(cmd->skb);
  98         kfree(cmd);
  99 }
 100
 101 static int hif_usb_send_regout(struct hif_device_usb *hif_dev,
 102                                struct sk_buff *skb)
 103 {
 104         struct urb *urb;
 105         struct cmd_buf *cmd;
 106         int ret = 0;
 107
 108         urb = usb_alloc_urb(0, GFP_KERNEL);
 109         if (urb == NULL)
 110                 return -ENOMEM;
 111
 112         cmd = kzalloc(sizeof(*cmd), GFP_KERNEL);
 113         if (cmd == NULL) {
 114                 usb_free_urb(urb);
 115                 return -ENOMEM;
 116         }
 117
 118         cmd->skb = skb;
 119         cmd->hif_dev = hif_dev;
 120
 121         usb_fill_int_urb(urb, hif_dev->udev,
 122                          usb_sndintpipe(hif_dev->udev, USB_REG_OUT_PIPE),
 123                          skb->data, skb->len,
 124                          hif_usb_regout_cb, cmd, 1);
 125
 126         usb_anchor_urb(urb, &hif_dev->regout_submitted);
 127         ret = usb_submit_urb(urb, GFP_KERNEL);
 128         if (ret) {
 129                 usb_unanchor_urb(urb);
 130                 kfree(cmd);
 131         }
 132         usb_free_urb(urb);
 133
 134         return ret;
 135 }
 136
 137 static void hif_usb_mgmt_cb(struct urb *urb)
 138 {
 139         struct cmd_buf *cmd = (struct cmd_buf *)urb->context;
 140         struct hif_device_usb *hif_dev;
 141         unsigned long flags;
 142         bool txok = true;
 143
 144         if (!cmd || !cmd->skb || !cmd->hif_dev)
 145                 return;
 146
 147         hif_dev = cmd->hif_dev;
 148
 149         switch (urb->status) {
 150         case 0:
 151                 break;
 152         case -ENOENT:
 153         case -ECONNRESET:
 154         case -ENODEV:
 155         case -ESHUTDOWN:
 156                 txok = false;
 157
 158                 /*
 159                  * If the URBs are being flushed, no need to complete
 160                  * this packet.
 161                  */
 162                 spin_lock_irqsave(&hif_dev->tx.tx_lock, flags);
 163                 if (hif_dev->tx.flags & HIF_USB_TX_FLUSH) {
 164                         spin_unlock_irqrestore(&hif_dev->tx.tx_lock, flags);
 165                         dev_kfree_skb_any(cmd->skb);
 166                         kfree(cmd);
 167                         return;
 168                 }
 169                 spin_unlock_irqrestore(&hif_dev->tx.tx_lock, flags);
 170
 171                 break;
 172         default:
 173                 txok = false;
 174                 break;
 175         }
 176
 177         skb_pull(cmd->skb, 4);
 178         ath9k_htc_txcompletion_cb(cmd->hif_dev->htc_handle,
 179                                   cmd->skb, txok);
 180         kfree(cmd);
 181 }
 182
 183 static int hif_usb_send_mgmt(struct hif_device_usb *hif_dev,
 184                              struct sk_buff *skb)
 185 {
 186         struct urb *urb;
 187         struct cmd_buf *cmd;
 188         int ret = 0;
 189         __le16 *hdr;
 190
 191         urb = usb_alloc_urb(0, GFP_ATOMIC);
 192         if (urb == NULL)
 193                 return -ENOMEM;
 194
 195         cmd = kzalloc(sizeof(*cmd), GFP_ATOMIC);
 196         if (cmd == NULL) {
 197                 usb_free_urb(urb);
 198                 return -ENOMEM;
 199         }
 200
 201         cmd->skb = skb;
 202         cmd->hif_dev = hif_dev;
 203
 204         hdr = skb_push(skb, 4);
 205         *hdr++ = cpu_to_le16(skb->len - 4);
 206         *hdr++ = cpu_to_le16(ATH_USB_TX_STREAM_MODE_TAG);
 207
 208         usb_fill_bulk_urb(urb, hif_dev->udev,
 209                          usb_sndbulkpipe(hif_dev->udev, USB_WLAN_TX_PIPE),
 210                          skb->data, skb->len,
 211                          hif_usb_mgmt_cb, cmd);
 212
 213         usb_anchor_urb(urb, &hif_dev->mgmt_submitted);
 214         ret = usb_submit_urb(urb, GFP_ATOMIC);
 215         if (ret) {
 216                 usb_unanchor_urb(urb);
 217                 kfree(cmd);
 218         }
 219         usb_free_urb(urb);
 220
 221         return ret;
 222 }
 223
 224 static inline void ath9k_skb_queue_purge(struct hif_device_usb *hif_dev,
 225                                          struct sk_buff_head *list)
 226 {
 227         struct sk_buff *skb;
 228
 229         while ((skb = __skb_dequeue(list)) != NULL) {
 230                 dev_kfree_skb_any(skb);
 231         }
 232 }
 233
 234 static inline void ath9k_skb_queue_complete(struct hif_device_usb *hif_dev,
 235                                             struct sk_buff_head *queue,
 236                                             bool txok)
 237 {
 238         struct sk_buff *skb;
 239
 240         while ((skb = __skb_dequeue(queue)) != NULL) {
 241 #ifdef CONFIG_ATH9K_HTC_DEBUGFS
 242                 int ln = skb->len;
 243 #endif
 244                 ath9k_htc_txcompletion_cb(hif_dev->htc_handle,
 245                                           skb, txok);
 246                 if (txok) {
 247                         TX_STAT_INC(skb_success);
 248                         TX_STAT_ADD(skb_success_bytes, ln);
 249                 }
 250                 else
 251                         TX_STAT_INC(skb_failed);
 252         }
 253 }
 254
 255 static void hif_usb_tx_cb(struct urb *urb)
 256 {
 257         struct tx_buf *tx_buf = (struct tx_buf *) urb->context;
 258         struct hif_device_usb *hif_dev;
 259         bool txok = true;
 260
 261         if (!tx_buf || !tx_buf->hif_dev)
 262                 return;
 263
 264         hif_dev = tx_buf->hif_dev;
 265
 266         switch (urb->status) {
 267         case 0:
 268                 break;
 269         case -ENOENT:
 270         case -ECONNRESET:
 271         case -ENODEV:
 272         case -ESHUTDOWN:
 273                 txok = false;
 274
 275                 /*
 276                  * If the URBs are being flushed, no need to add this
 277                  * URB to the free list.
 278                  */
 279                 spin_lock(&hif_dev->tx.tx_lock);
 280                 if (hif_dev->tx.flags & HIF_USB_TX_FLUSH) {
 281                         spin_unlock(&hif_dev->tx.tx_lock);
 282                         ath9k_skb_queue_purge(hif_dev, &tx_buf->skb_queue);
 283                         return;
 284                 }
 285                 spin_unlock(&hif_dev->tx.tx_lock);
 286
 287                 break;
 288         default:
 289                 txok = false;
 290                 break;
 291         }
 292
 293         ath9k_skb_queue_complete(hif_dev, &tx_buf->skb_queue, txok);
 294
 295         /* Re-initialize the SKB queue */
 296         tx_buf->len = tx_buf->offset = 0;
 297         __skb_queue_head_init(&tx_buf->skb_queue);
 298
 299         /* Add this TX buffer to the free list */
 300         spin_lock(&hif_dev->tx.tx_lock);
 301         list_move_tail(&tx_buf->list, &hif_dev->tx.tx_buf);
 302         hif_dev->tx.tx_buf_cnt++;
 303         if (!(hif_dev->tx.flags & HIF_USB_TX_STOP))
 304                 __hif_usb_tx(hif_dev); /* Check for pending SKBs */
 305         TX_STAT_INC(buf_completed);
 306         spin_unlock(&hif_dev->tx.tx_lock);
 307 }
 308
 309 /* TX lock has to be taken */
 310 static int __hif_usb_tx(struct hif_device_usb *hif_dev)
 311 {
 312         struct tx_buf *tx_buf = NULL;
 313         struct sk_buff *nskb = NULL;
 314         int ret = 0, i;
 315         u16 tx_skb_cnt = 0;
 316         u8 *buf;
 317         __le16 *hdr;
 318
 319         if (hif_dev->tx.tx_skb_cnt == 0)
 320                 return 0;
 321
 322         /* Check if a free TX buffer is available */
 323         if (list_empty(&hif_dev->tx.tx_buf))
 324                 return 0;
 325
 326         tx_buf = list_first_entry(&hif_dev->tx.tx_buf, struct tx_buf, list);
 327         list_move_tail(&tx_buf->list, &hif_dev->tx.tx_pending);
 328         hif_dev->tx.tx_buf_cnt--;
 329
 330         tx_skb_cnt = min_t(u16, hif_dev->tx.tx_skb_cnt, MAX_TX_AGGR_NUM);
 331
 332         for (i = 0; i < tx_skb_cnt; i++) {
 333                 nskb = __skb_dequeue(&hif_dev->tx.tx_skb_queue);
 334
 335                 /* Should never be NULL */
 336                 BUG_ON(!nskb);
 337
 338                 hif_dev->tx.tx_skb_cnt--;
 339
 340                 buf = tx_buf->buf;
 341                 buf += tx_buf->offset;
 342                 hdr = (__le16 *)buf;
 343                 *hdr++ = cpu_to_le16(nskb->len);
 344                 *hdr++ = cpu_to_le16(ATH_USB_TX_STREAM_MODE_TAG);
 345                 buf += 4;
 346                 memcpy(buf, nskb->data, nskb->len);
 347                 tx_buf->len = nskb->len + 4;
 348
 349                 if (i < (tx_skb_cnt - 1))
 350                         tx_buf->offset += (((tx_buf->len - 1) / 4) + 1) * 4;
 351
 352                 if (i == (tx_skb_cnt - 1))
 353                         tx_buf->len += tx_buf->offset;
 354
 355                 __skb_queue_tail(&tx_buf->skb_queue, nskb);
 356                 TX_STAT_INC(skb_queued);
 357         }
 358
 359         usb_fill_bulk_urb(tx_buf->urb, hif_dev->udev,
 360                           usb_sndbulkpipe(hif_dev->udev, USB_WLAN_TX_PIPE),
 361                           tx_buf->buf, tx_buf->len,
 362                           hif_usb_tx_cb, tx_buf);
 363
 364         ret = usb_submit_urb(tx_buf->urb, GFP_ATOMIC);
 365         if (ret) {
 366                 tx_buf->len = tx_buf->offset = 0;
 367                 ath9k_skb_queue_complete(hif_dev, &tx_buf->skb_queue, false);
 368                 __skb_queue_head_init(&tx_buf->skb_queue);
 369                 list_move_tail(&tx_buf->list, &hif_dev->tx.tx_buf);
 370                 hif_dev->tx.tx_buf_cnt++;
 371         }
 372
 373         if (!ret)
 374                 TX_STAT_INC(buf_queued);
 375
 376         return ret;
 377 }
 378
 379 static int hif_usb_send_tx(struct hif_device_usb *hif_dev, struct sk_buff *skb)
 380 {
 381         struct ath9k_htc_tx_ctl *tx_ctl;
 382         unsigned long flags;
 383         int ret = 0;
 384
 385         spin_lock_irqsave(&hif_dev->tx.tx_lock, flags);
 386
 387         if (hif_dev->tx.flags & HIF_USB_TX_STOP) {
 388                 spin_unlock_irqrestore(&hif_dev->tx.tx_lock, flags);
 389                 return -ENODEV;
 390         }
 391
 392         /* Check if the max queue count has been reached */
 393         if (hif_dev->tx.tx_skb_cnt > MAX_TX_BUF_NUM) {
 394                 spin_unlock_irqrestore(&hif_dev->tx.tx_lock, flags);
 395                 return -ENOMEM;
 396         }
 397
 398         spin_unlock_irqrestore(&hif_dev->tx.tx_lock, flags);
 399
 400         tx_ctl = HTC_SKB_CB(skb);
 401
 402         /* Mgmt/Beacon frames don't use the TX buffer pool */
 403         if ((tx_ctl->type == ATH9K_HTC_MGMT) ||
 404             (tx_ctl->type == ATH9K_HTC_BEACON)) {
 405                 ret = hif_usb_send_mgmt(hif_dev, skb);
 406         }
 407
 408         spin_lock_irqsave(&hif_dev->tx.tx_lock, flags);
 409
 410         if ((tx_ctl->type == ATH9K_HTC_NORMAL) ||
 411             (tx_ctl->type == ATH9K_HTC_AMPDU)) {
 412                 __skb_queue_tail(&hif_dev->tx.tx_skb_queue, skb);
 413                 hif_dev->tx.tx_skb_cnt++;
 414         }
 415
 416         /* Check if AMPDUs have to be sent immediately */
 417         if ((hif_dev->tx.tx_buf_cnt == MAX_TX_URB_NUM) &&
 418             (hif_dev->tx.tx_skb_cnt < 2)) {
 419                 __hif_usb_tx(hif_dev);
 420         }
 421
 422         spin_unlock_irqrestore(&hif_dev->tx.tx_lock, flags);
 423
 424         return ret;
 425 }
 426
 427 static void hif_usb_start(void *hif_handle)
 428 {
 429         struct hif_device_usb *hif_dev = hif_handle;
 430         unsigned long flags;
 431
 432         hif_dev->flags |= HIF_USB_START;
 433
 434         spin_lock_irqsave(&hif_dev->tx.tx_lock, flags);
 435         hif_dev->tx.flags &= ~HIF_USB_TX_STOP;
 436         spin_unlock_irqrestore(&hif_dev->tx.tx_lock, flags);
 437 }
 438
 439 static void hif_usb_stop(void *hif_handle)
 440 {
 441         struct hif_device_usb *hif_dev = hif_handle;
 442         struct tx_buf *tx_buf = NULL, *tx_buf_tmp = NULL;
 443         unsigned long flags;
 444
 445         spin_lock_irqsave(&hif_dev->tx.tx_lock, flags);
 446         ath9k_skb_queue_complete(hif_dev, &hif_dev->tx.tx_skb_queue, false);
 447         hif_dev->tx.tx_skb_cnt = 0;
 448         hif_dev->tx.flags |= HIF_USB_TX_STOP;
 449         spin_unlock_irqrestore(&hif_dev->tx.tx_lock, flags);
 450
 451         /* The pending URBs have to be canceled. */
 452         spin_lock_irqsave(&hif_dev->tx.tx_lock, flags);
 453         list_for_each_entry_safe(tx_buf, tx_buf_tmp,
 454                                  &hif_dev->tx.tx_pending, list) {
 455                 usb_get_urb(tx_buf->urb);
 456                 spin_unlock_irqrestore(&hif_dev->tx.tx_lock, flags);
 457                 usb_kill_urb(tx_buf->urb);
 458                 list_del(&tx_buf->list);
 459                 usb_free_urb(tx_buf->urb);
 460                 kfree(tx_buf->buf);
 461                 kfree(tx_buf);
 462                 spin_lock_irqsave(&hif_dev->tx.tx_lock, flags);
 463         }
 464         spin_unlock_irqrestore(&hif_dev->tx.tx_lock, flags);
 465
 466         usb_kill_anchored_urbs(&hif_dev->mgmt_submitted);
 467 }
 468
 469 static int hif_usb_send(void *hif_handle, u8 pipe_id, struct sk_buff *skb)
 470 {
 471         struct hif_device_usb *hif_dev = hif_handle;
 472         int ret = 0;
 473
 474         switch (pipe_id) {
 475         case USB_WLAN_TX_PIPE:
 476                 ret = hif_usb_send_tx(hif_dev, skb);
 477                 break;
 478         case USB_REG_OUT_PIPE:
 479                 ret = hif_usb_send_regout(hif_dev, skb);
 480                 break;
 481         default:
 482                 dev_err(&hif_dev->udev->dev,
 483                         "ath9k_htc: Invalid TX pipe: %d\n", pipe_id);
 484                 ret = -EINVAL;
 485                 break;
 486         }
 487
 488         return ret;
 489 }
 490
 491 static inline bool check_index(struct sk_buff *skb, u8 idx)
 492 {
 493         struct ath9k_htc_tx_ctl *tx_ctl;
 494
 495         tx_ctl = HTC_SKB_CB(skb);
 496
 497         if ((tx_ctl->type == ATH9K_HTC_AMPDU) &&
 498             (tx_ctl->sta_idx == idx))
 499                 return true;
 500
 501         return false;
 502 }
 503
 504 static void hif_usb_sta_drain(void *hif_handle, u8 idx)
 505 {
 506         struct hif_device_usb *hif_dev = hif_handle;
 507         struct sk_buff *skb, *tmp;
 508         unsigned long flags;
 509
 510         spin_lock_irqsave(&hif_dev->tx.tx_lock, flags);
 511
 512         skb_queue_walk_safe(&hif_dev->tx.tx_skb_queue, skb, tmp) {
 513                 if (check_index(skb, idx)) {
 514                         __skb_unlink(skb, &hif_dev->tx.tx_skb_queue);
 515                         ath9k_htc_txcompletion_cb(hif_dev->htc_handle,
 516                                                   skb, false);
 517                         hif_dev->tx.tx_skb_cnt--;
 518                         TX_STAT_INC(skb_failed);
 519                 }
 520         }
 521
 522         spin_unlock_irqrestore(&hif_dev->tx.tx_lock, flags);
 523 }
 524
 525 static struct ath9k_htc_hif hif_usb = {
 526         .transport = ATH9K_HIF_USB,
 527         .name = "ath9k_hif_usb",
 528
 529         .control_ul_pipe = USB_REG_OUT_PIPE,
 530         .control_dl_pipe = USB_REG_IN_PIPE,
 531
 532         .start = hif_usb_start,
 533         .stop = hif_usb_stop,
 534         .sta_drain = hif_usb_sta_drain,
 535         .send = hif_usb_send,
 536 };
 537
 538 static void ath9k_hif_usb_rx_stream(struct hif_device_usb *hif_dev,
 539                                     struct sk_buff *skb)
 540 {
 541         struct sk_buff *nskb, *skb_pool[MAX_PKT_NUM_IN_TRANSFER];
 542         int index = 0, i, len = skb->len;
 543         int rx_remain_len, rx_pkt_len;
 544         u16 pool_index = 0;
 545         u8 *ptr;
 546
 547         spin_lock(&hif_dev->rx_lock);
 548
 549         rx_remain_len = hif_dev->rx_remain_len;
 550         rx_pkt_len = hif_dev->rx_transfer_len;
 551
 552         if (rx_remain_len != 0) {
 553                 struct sk_buff *remain_skb = hif_dev->remain_skb;
 554
 555                 if (remain_skb) {
 556                         ptr = (u8 *) remain_skb->data;
 557
 558                         index = rx_remain_len;
 559                         rx_remain_len -= hif_dev->rx_pad_len;
 560                         ptr += rx_pkt_len;
 561
 562                         memcpy(ptr, skb->data, rx_remain_len);
 563
 564                         rx_pkt_len += rx_remain_len;
 565                         hif_dev->rx_remain_len = 0;
 566                         skb_put(remain_skb, rx_pkt_len);
 567
 568                         skb_pool[pool_index++] = remain_skb;
 569
 570                 } else {
 571                         index = rx_remain_len;
 572                 }
 573         }
 574
 575         spin_unlock(&hif_dev->rx_lock);
 576
 577         while (index < len) {
 578                 u16 pkt_len;
 579                 u16 pkt_tag;
 580                 u16 pad_len;
 581                 int chk_idx;
 582
 583                 ptr = (u8 *) skb->data;
 584
 585                 pkt_len = get_unaligned_le16(ptr + index);
 586                 pkt_tag = get_unaligned_le16(ptr + index + 2);
 587
 588                 if (pkt_tag != ATH_USB_RX_STREAM_MODE_TAG) {
 589                         RX_STAT_INC(skb_dropped);
 590                         return;
 591                 }
 592
 593                 if (pkt_len > 2 * MAX_RX_BUF_SIZE) {
 594                         dev_err(&hif_dev->udev->dev,
 595                                 "ath9k_htc: invalid pkt_len (%x)\n", pkt_len);
 596                         RX_STAT_INC(skb_dropped);
 597                         return;
 598                 }
 599
 600                 pad_len = 4 - (pkt_len & 0x3);
 601                 if (pad_len == 4)
 602                         pad_len = 0;
 603
 604                 chk_idx = index;
 605                 index = index + 4 + pkt_len + pad_len;
 606
 607                 if (index > MAX_RX_BUF_SIZE) {
 608                         spin_lock(&hif_dev->rx_lock);
 609                         hif_dev->rx_remain_len = index - MAX_RX_BUF_SIZE;
 610                         hif_dev->rx_transfer_len =
 611                                 MAX_RX_BUF_SIZE - chk_idx - 4;
 612                         hif_dev->rx_pad_len = pad_len;
 613
 614                         nskb = __dev_alloc_skb(pkt_len + 32, GFP_ATOMIC);
 615                         if (!nskb) {
 616                                 dev_err(&hif_dev->udev->dev,
 617                                         "ath9k_htc: RX memory allocation error\n");
 618                                 spin_unlock(&hif_dev->rx_lock);
 619                                 goto err;
 620                         }
 621                         skb_reserve(nskb, 32);
 622                         RX_STAT_INC(skb_allocated);
 623
 624                         memcpy(nskb->data, &(skb->data[chk_idx+4]),
 625                                hif_dev->rx_transfer_len);
 626
 627                         /* Record the buffer pointer */
 628                         hif_dev->remain_skb = nskb;
 629                         spin_unlock(&hif_dev->rx_lock);
 630                 } else {
 631                         if (pool_index == MAX_PKT_NUM_IN_TRANSFER) {
 632                                 dev_err(&hif_dev->udev->dev,
 633                                         "ath9k_htc: over RX MAX_PKT_NUM\n");
 634                                 goto err;
 635                         }
 636                         nskb = __dev_alloc_skb(pkt_len + 32, GFP_ATOMIC);
 637                         if (!nskb) {
 638                                 dev_err(&hif_dev->udev->dev,
 639                                         "ath9k_htc: RX memory allocation error\n");
 640                                 goto err;
 641                         }
 642                         skb_reserve(nskb, 32);
 643                         RX_STAT_INC(skb_allocated);
 644
 645                         memcpy(nskb->data, &(skb->data[chk_idx+4]), pkt_len);
 646                         skb_put(nskb, pkt_len);
 647                         skb_pool[pool_index++] = nskb;
 648                 }
 649         }
 650
 651 err:
 652         for (i = 0; i < pool_index; i++) {
 653                 RX_STAT_ADD(skb_completed_bytes, skb_pool[i]->len);
 654                 ath9k_htc_rx_msg(hif_dev->htc_handle, skb_pool[i],
 655                                  skb_pool[i]->len, USB_WLAN_RX_PIPE);
 656                 RX_STAT_INC(skb_completed);
 657         }
 658 }
 659
 660 static void ath9k_hif_usb_rx_cb(struct urb *urb)
 661 {
 662         struct rx_buf *rx_buf = (struct rx_buf *)urb->context;
 663         struct hif_device_usb *hif_dev = rx_buf->hif_dev;
 664         struct sk_buff *skb = rx_buf->skb;
 665         int ret;
 666
 667         if (!skb)
 668                 return;
 669
 670         if (!hif_dev)
 671                 goto free;
 672
 673         switch (urb->status) {
 674         case 0:
 675                 break;
 676         case -ENOENT:
 677         case -ECONNRESET:
 678         case -ENODEV:
 679         case -ESHUTDOWN:
 680                 goto free;
 681         default:
 682                 goto resubmit;
 683         }
 684
 685         if (likely(urb->actual_length != 0)) {
 686                 skb_put(skb, urb->actual_length);
 687                 ath9k_hif_usb_rx_stream(hif_dev, skb);
 688         }
 689
 690 resubmit:
 691         skb_reset_tail_pointer(skb);
 692         skb_trim(skb, 0);
 693
 694         usb_anchor_urb(urb, &hif_dev->rx_submitted);
 695         ret = usb_submit_urb(urb, GFP_ATOMIC);
 696         if (ret) {
 697                 usb_unanchor_urb(urb);
 698                 goto free;
 699         }
 700
 701         return;
 702 free:
 703         kfree_skb(skb);
 704         kfree(rx_buf);
 705 }
 706
 707 static void ath9k_hif_usb_reg_in_cb(struct urb *urb)
 708 {
 709         struct rx_buf *rx_buf = (struct rx_buf *)urb->context;
 710         struct hif_device_usb *hif_dev = rx_buf->hif_dev;
 711         struct sk_buff *skb = rx_buf->skb;
 712         struct sk_buff *nskb;
 713         int ret;
 714
 715         if (!skb)
 716                 return;
 717
 718         if (!hif_dev)
 719                 goto free;
 720
 721         switch (urb->status) {
 722         case 0:
 723                 break;
 724         case -ENOENT:
 725         case -ECONNRESET:
 726         case -ENODEV:
 727         case -ESHUTDOWN:
 728                 goto free;
 729         default:
 730                 skb_reset_tail_pointer(skb);
 731                 skb_trim(skb, 0);
 732
 733                 goto resubmit;
 734         }
 735
 736         if (likely(urb->actual_length != 0)) {
 737                 skb_put(skb, urb->actual_length);
 738
 739                 /* Process the command first */
 740                 ath9k_htc_rx_msg(hif_dev->htc_handle, skb,
 741                                  skb->len, USB_REG_IN_PIPE);
 742
 743
 744                 nskb = alloc_skb(MAX_REG_IN_BUF_SIZE, GFP_ATOMIC);
 745                 if (!nskb) {
 746                         dev_err(&hif_dev->udev->dev,
 747                                 "ath9k_htc: REG_IN memory allocation failure\n");
 748                         urb->context = NULL;
 749                         return;
 750                 }
 751
 752                 rx_buf->skb = nskb;
 753
 754                 usb_fill_int_urb(urb, hif_dev->udev,
 755                                  usb_rcvintpipe(hif_dev->udev,
 756                                                  USB_REG_IN_PIPE),
 757                                  nskb->data, MAX_REG_IN_BUF_SIZE,
 758                                  ath9k_hif_usb_reg_in_cb, rx_buf, 1);
 759         }
 760
 761 resubmit:
 762         usb_anchor_urb(urb, &hif_dev->reg_in_submitted);
 763         ret = usb_submit_urb(urb, GFP_ATOMIC);
 764         if (ret) {
 765                 usb_unanchor_urb(urb);
 766                 goto free;
 767         }
 768
 769         return;
 770 free:
 771         kfree_skb(skb);
 772         kfree(rx_buf);
 773         urb->context = NULL;
 774 }
 775
 776 static void ath9k_hif_usb_dealloc_tx_urbs(struct hif_device_usb *hif_dev)
 777 {
 778         struct tx_buf *tx_buf = NULL, *tx_buf_tmp = NULL;
 779         unsigned long flags;
 780
 781         spin_lock_irqsave(&hif_dev->tx.tx_lock, flags);
 782         list_for_each_entry_safe(tx_buf, tx_buf_tmp,
 783                                  &hif_dev->tx.tx_buf, list) {
 784                 usb_get_urb(tx_buf->urb);
 785                 spin_unlock_irqrestore(&hif_dev->tx.tx_lock, flags);
 786                 usb_kill_urb(tx_buf->urb);
 787                 list_del(&tx_buf->list);
 788                 usb_free_urb(tx_buf->urb);
 789                 kfree(tx_buf->buf);
 790                 kfree(tx_buf);
 791                 spin_lock_irqsave(&hif_dev->tx.tx_lock, flags);
 792         }
 793         spin_unlock_irqrestore(&hif_dev->tx.tx_lock, flags);
 794
 795         spin_lock_irqsave(&hif_dev->tx.tx_lock, flags);
 796         hif_dev->tx.flags |= HIF_USB_TX_FLUSH;
 797         spin_unlock_irqrestore(&hif_dev->tx.tx_lock, flags);
 798
 799         spin_lock_irqsave(&hif_dev->tx.tx_lock, flags);
 800         list_for_each_entry_safe(tx_buf, tx_buf_tmp,
 801                                  &hif_dev->tx.tx_pending, list) {
 802                 usb_get_urb(tx_buf->urb);
 803                 spin_unlock_irqrestore(&hif_dev->tx.tx_lock, flags);
 804                 usb_kill_urb(tx_buf->urb);
 805                 list_del(&tx_buf->list);
 806                 usb_free_urb(tx_buf->urb);
 807                 kfree(tx_buf->buf);
 808                 kfree(tx_buf);
 809                 spin_lock_irqsave(&hif_dev->tx.tx_lock, flags);
 810         }
 811         spin_unlock_irqrestore(&hif_dev->tx.tx_lock, flags);
 812
 813         usb_kill_anchored_urbs(&hif_dev->mgmt_submitted);
 814 }
 815
 816 static int ath9k_hif_usb_alloc_tx_urbs(struct hif_device_usb *hif_dev)
 817 {
 818         struct tx_buf *tx_buf;
 819         int i;
 820
 821         INIT_LIST_HEAD(&hif_dev->tx.tx_buf);
 822         INIT_LIST_HEAD(&hif_dev->tx.tx_pending);
 823         spin_lock_init(&hif_dev->tx.tx_lock);
 824         __skb_queue_head_init(&hif_dev->tx.tx_skb_queue);
 825         init_usb_anchor(&hif_dev->mgmt_submitted);
 826
 827         for (i = 0; i < MAX_TX_URB_NUM; i++) {
 828                 tx_buf = kzalloc(sizeof(*tx_buf), GFP_KERNEL);
 829                 if (!tx_buf)
 830                         goto err;
 831
 832                 tx_buf->buf = kzalloc(MAX_TX_BUF_SIZE, GFP_KERNEL);
 833                 if (!tx_buf->buf)
 834                         goto err;
 835
 836                 tx_buf->urb = usb_alloc_urb(0, GFP_KERNEL);
 837                 if (!tx_buf->urb)
 838                         goto err;
 839
 840                 tx_buf->hif_dev = hif_dev;
 841                 __skb_queue_head_init(&tx_buf->skb_queue);
 842
 843                 list_add_tail(&tx_buf->list, &hif_dev->tx.tx_buf);
 844         }
 845
 846         hif_dev->tx.tx_buf_cnt = MAX_TX_URB_NUM;
 847
 848         return 0;
 849 err:
 850         if (tx_buf) {
 851                 kfree(tx_buf->buf);
 852                 kfree(tx_buf);
 853         }
 854         ath9k_hif_usb_dealloc_tx_urbs(hif_dev);
 855         return -ENOMEM;
 856 }
 857
 858 static void ath9k_hif_usb_dealloc_rx_urbs(struct hif_device_usb *hif_dev)
 859 {
 860         usb_kill_anchored_urbs(&hif_dev->rx_submitted);
 861 }
 862
 863 static int ath9k_hif_usb_alloc_rx_urbs(struct hif_device_usb *hif_dev)
 864 {
 865         struct rx_buf *rx_buf = NULL;
 866         struct sk_buff *skb = NULL;
 867         struct urb *urb = NULL;
 868         int i, ret;
 869
 870         init_usb_anchor(&hif_dev->rx_submitted);
 871         spin_lock_init(&hif_dev->rx_lock);
 872
 873         for (i = 0; i < MAX_RX_URB_NUM; i++) {
 874
 875                 rx_buf = kzalloc(sizeof(*rx_buf), GFP_KERNEL);
 876                 if (!rx_buf) {
 877                         ret = -ENOMEM;
 878                         goto err_rxb;
 879                 }
 880
 881                 /* Allocate URB */
 882                 urb = usb_alloc_urb(0, GFP_KERNEL);
 883                 if (urb == NULL) {
 884                         ret = -ENOMEM;
 885                         goto err_urb;
 886                 }
 887
 888                 /* Allocate buffer */
 889                 skb = alloc_skb(MAX_RX_BUF_SIZE, GFP_KERNEL);
 890                 if (!skb) {
 891                         ret = -ENOMEM;
 892                         goto err_skb;
 893                 }
 894
 895                 rx_buf->hif_dev = hif_dev;
 896                 rx_buf->skb = skb;
 897
 898                 usb_fill_bulk_urb(urb, hif_dev->udev,
 899                                   usb_rcvbulkpipe(hif_dev->udev,
 900                                                   USB_WLAN_RX_PIPE),
 901                                   skb->data, MAX_RX_BUF_SIZE,
 902                                   ath9k_hif_usb_rx_cb, rx_buf);
 903
 904                 /* Anchor URB */
 905                 usb_anchor_urb(urb, &hif_dev->rx_submitted);
 906
 907                 /* Submit URB */
 908                 ret = usb_submit_urb(urb, GFP_KERNEL);
 909                 if (ret) {
 910                         usb_unanchor_urb(urb);
 911                         goto err_submit;
 912                 }
 913
 914                 /*
 915                  * Drop reference count.
 916                  * This ensures that the URB is freed when killing them.
 917                  */
 918                 usb_free_urb(urb);
 919         }
 920
 921         return 0;
 922
 923 err_submit:
 924         kfree_skb(skb);
 925 err_skb:
 926         usb_free_urb(urb);
 927 err_urb:
 928         kfree(rx_buf);
 929 err_rxb:
 930         ath9k_hif_usb_dealloc_rx_urbs(hif_dev);
 931         return ret;
 932 }
 933
 934 static void ath9k_hif_usb_dealloc_reg_in_urbs(struct hif_device_usb *hif_dev)
 935 {
 936         usb_kill_anchored_urbs(&hif_dev->reg_in_submitted);
 937 }
 938
 939 static int ath9k_hif_usb_alloc_reg_in_urbs(struct hif_device_usb *hif_dev)
 940 {
 941         struct rx_buf *rx_buf = NULL;
 942         struct sk_buff *skb = NULL;
 943         struct urb *urb = NULL;
 944         int i, ret;
 945
 946         init_usb_anchor(&hif_dev->reg_in_submitted);
 947
 948         for (i = 0; i < MAX_REG_IN_URB_NUM; i++) {
 949
 950                 rx_buf = kzalloc(sizeof(*rx_buf), GFP_KERNEL);
 951                 if (!rx_buf) {
 952                         ret = -ENOMEM;
 953                         goto err_rxb;
 954                 }
 955
 956                 /* Allocate URB */
 957                 urb = usb_alloc_urb(0, GFP_KERNEL);
 958                 if (urb == NULL) {
 959                         ret = -ENOMEM;
 960                         goto err_urb;
 961                 }
 962
 963                 /* Allocate buffer */
 964                 skb = alloc_skb(MAX_REG_IN_BUF_SIZE, GFP_KERNEL);
 965                 if (!skb) {
 966                         ret = -ENOMEM;
 967                         goto err_skb;
 968                 }
 969
 970                 rx_buf->hif_dev = hif_dev;
 971                 rx_buf->skb = skb;
 972
 973                 usb_fill_int_urb(urb, hif_dev->udev,
 974                                   usb_rcvintpipe(hif_dev->udev,
 975                                                   USB_REG_IN_PIPE),
 976                                   skb->data, MAX_REG_IN_BUF_SIZE,
 977                                   ath9k_hif_usb_reg_in_cb, rx_buf, 1);
 978
 979                 /* Anchor URB */
 980                 usb_anchor_urb(urb, &hif_dev->reg_in_submitted);
 981
 982                 /* Submit URB */
 983                 ret = usb_submit_urb(urb, GFP_KERNEL);
 984                 if (ret) {
 985                         usb_unanchor_urb(urb);
 986                         goto err_submit;
 987                 }
 988
 989                 /*
 990                  * Drop reference count.
 991                  * This ensures that the URB is freed when killing them.
 992                  */
 993                 usb_free_urb(urb);
 994         }
 995
 996         return 0;
 997
 998 err_submit:
 999         kfree_skb(skb);
1000 err_skb:
1001         usb_free_urb(urb);
1002 err_urb:
1003         kfree(rx_buf);
1004 err_rxb:
1005         ath9k_hif_usb_dealloc_reg_in_urbs(hif_dev);
1006         return ret;
1007 }
1008
1009 static int ath9k_hif_usb_alloc_urbs(struct hif_device_usb *hif_dev)
1010 {
1011         /* Register Write */
1012         init_usb_anchor(&hif_dev->regout_submitted);
1013
1014         /* TX */
1015         if (ath9k_hif_usb_alloc_tx_urbs(hif_dev) < 0)
1016                 goto err;
1017
1018         /* RX */
1019         if (ath9k_hif_usb_alloc_rx_urbs(hif_dev) < 0)
1020                 goto err_rx;
1021
1022         /* Register Read */
1023         if (ath9k_hif_usb_alloc_reg_in_urbs(hif_dev) < 0)
1024                 goto err_reg;
1025
1026         return 0;
1027 err_reg:
1028         ath9k_hif_usb_dealloc_rx_urbs(hif_dev);
1029 err_rx:
1030         ath9k_hif_usb_dealloc_tx_urbs(hif_dev);
1031 err:
1032         return -ENOMEM;
1033 }
1034
1035 void ath9k_hif_usb_dealloc_urbs(struct hif_device_usb *hif_dev)
1036 {
1037         usb_kill_anchored_urbs(&hif_dev->regout_submitted);
1038         ath9k_hif_usb_dealloc_reg_in_urbs(hif_dev);
1039         ath9k_hif_usb_dealloc_tx_urbs(hif_dev);
1040         ath9k_hif_usb_dealloc_rx_urbs(hif_dev);
1041 }
1042
1043 static int ath9k_hif_usb_download_fw(struct hif_device_usb *hif_dev)
1044 {
1045         int transfer, err;
1046         const void *data = hif_dev->fw_data;
1047         size_t len = hif_dev->fw_size;
1048         u32 addr = AR9271_FIRMWARE;
1049         u8 *buf = kzalloc(4096, GFP_KERNEL);
1050         u32 firm_offset;
1051
1052         if (!buf)
1053                 return -ENOMEM;
1054
1055         while (len) {
1056                 transfer = min_t(size_t, len, 4096);
1057                 memcpy(buf, data, transfer);
1058
1059                 err = usb_control_msg(hif_dev->udev,
1060                                       usb_sndctrlpipe(hif_dev->udev, 0),
1061                                       FIRMWARE_DOWNLOAD, 0x40 | USB_DIR_OUT,
1062                                       addr >> 8, 0, buf, transfer,
1063                                       USB_MSG_TIMEOUT);
1064                 if (err < 0) {
1065                         kfree(buf);
1066                         return err;
1067                 }
1068
1069                 len -= transfer;
1070                 data += transfer;
1071                 addr += transfer;
1072         }
1073         kfree(buf);
1074
1075         if (IS_AR7010_DEVICE(hif_dev->usb_device_id->driver_info))
1076                 firm_offset = AR7010_FIRMWARE_TEXT;
1077         else
1078                 firm_offset = AR9271_FIRMWARE_TEXT;
1079
1080         /*
1081          * Issue FW download complete command to firmware.
1082          */
1083         err = usb_control_msg(hif_dev->udev, usb_sndctrlpipe(hif_dev->udev, 0),
1084                               FIRMWARE_DOWNLOAD_COMP,
1085                               0x40 | USB_DIR_OUT,
1086                               firm_offset >> 8, 0, NULL, 0, USB_MSG_TIMEOUT);
1087         if (err)
1088                 return -EIO;
1089
1090         dev_info(&hif_dev->udev->dev, "ath9k_htc: Transferred FW: %s, size: %ld\n",
1091                  hif_dev->fw_name, (unsigned long) hif_dev->fw_size);
1092
1093         return 0;
1094 }
1095
1096 static int ath9k_hif_usb_dev_init(struct hif_device_usb *hif_dev)
1097 {
1098         int ret;
1099
1100         ret = ath9k_hif_usb_download_fw(hif_dev);
1101         if (ret) {
1102                 dev_err(&hif_dev->udev->dev,
1103                         "ath9k_htc: Firmware - %s download failed\n",
1104                         hif_dev->fw_name);
1105                 return ret;
1106         }
1107
1108         /* Alloc URBs */
1109         ret = ath9k_hif_usb_alloc_urbs(hif_dev);
1110         if (ret) {
1111                 dev_err(&hif_dev->udev->dev,
1112                         "ath9k_htc: Unable to allocate URBs\n");
1113                 return ret;
1114         }
1115
1116         return 0;
1117 }
1118
1119 static void ath9k_hif_usb_dev_deinit(struct hif_device_usb *hif_dev)
1120 {
1121         ath9k_hif_usb_dealloc_urbs(hif_dev);
1122 }
1123
1124 /*
1125  * If initialization fails or the FW cannot be retrieved,
1126  * detach the device.
1127  */
1128 static void ath9k_hif_usb_firmware_fail(struct hif_device_usb *hif_dev)
1129 {
1130         struct device *dev = &hif_dev->udev->dev;
1131         struct device *parent = dev->parent;
1132
1133         complete_all(&hif_dev->fw_done);
1134
1135         if (parent)
1136                 device_lock(parent);
1137
1138         device_release_driver(dev);
1139
1140         if (parent)
1141                 device_unlock(parent);
1142 }
1143
1144 static void ath9k_hif_usb_firmware_cb(const struct firmware *fw, void *context);
1145
1146 /* taken from iwlwifi */
1147 static int ath9k_hif_request_firmware(struct hif_device_usb *hif_dev,
1148                                       bool first)
1149 {
1150         char index[8], *chip;
1151         int ret;
1152
1153         if (first) {
1154                 if (htc_use_dev_fw) {
1155                         hif_dev->fw_minor_index = FIRMWARE_MINOR_IDX_MAX + 1;
1156                         sprintf(index, "%s", "dev");
1157                 } else {
1158                         hif_dev->fw_minor_index = FIRMWARE_MINOR_IDX_MAX;
1159                         sprintf(index, "%d", hif_dev->fw_minor_index);
1160                 }
1161         } else {
1162                 hif_dev->fw_minor_index--;
1163                 sprintf(index, "%d", hif_dev->fw_minor_index);
1164         }
1165
1166         /* test for FW 1.3 */
1167         if (MAJOR_VERSION_REQ == 1 && hif_dev->fw_minor_index == 3) {
1168                 const char *filename;
1169
1170                 if (IS_AR7010_DEVICE(hif_dev->usb_device_id->driver_info))
1171                         filename = FIRMWARE_AR7010_1_1;
1172                 else
1173                         filename = FIRMWARE_AR9271;
1174
1175                 /* expected fw locations:
1176                  * - htc_9271.fw   (stable version 1.3, depricated)
1177                  */
1178                 snprintf(hif_dev->fw_name, sizeof(hif_dev->fw_name),
1179                          "%s", filename);
1180
1181         } else if (hif_dev->fw_minor_index < FIRMWARE_MINOR_IDX_MIN) {
1182                 dev_err(&hif_dev->udev->dev, "no suitable firmware found!\n");
1183
1184                 return -ENOENT;
1185         } else {
1186                 if (IS_AR7010_DEVICE(hif_dev->usb_device_id->driver_info))
1187                         chip = "7010";
1188                 else
1189                         chip = "9271";
1190
1191                 /* expected fw locations:
1192                  * - ath9k_htc/htc_9271-1.dev.0.fw (development version)
1193                  * - ath9k_htc/htc_9271-1.4.0.fw   (stable version)
1194                  */
1195                 snprintf(hif_dev->fw_name, sizeof(hif_dev->fw_name),
1196                          "%s/htc_%s-%d.%s.0.fw", HTC_FW_PATH,
1197                          chip, MAJOR_VERSION_REQ, index);
1198         }
1199
1200         ret = request_firmware_nowait(THIS_MODULE, true, hif_dev->fw_name,
1201                                       &hif_dev->udev->dev, GFP_KERNEL,
1202                                       hif_dev, ath9k_hif_usb_firmware_cb);
1203         if (ret) {
1204                 dev_err(&hif_dev->udev->dev,
1205                         "ath9k_htc: Async request for firmware %s failed\n",
1206                         hif_dev->fw_name);
1207                 return ret;
1208         }
1209
1210         dev_info(&hif_dev->udev->dev, "ath9k_htc: Firmware %s requested\n",
1211                  hif_dev->fw_name);
1212
1213         return ret;
1214 }
1215
1216 static void ath9k_hif_usb_firmware_cb(const struct firmware *fw, void *context)
1217 {
1218         struct hif_device_usb *hif_dev = context;
1219         int ret;
1220
1221         if (!fw) {
1222                 ret = ath9k_hif_request_firmware(hif_dev, false);
1223                 if (!ret)
1224                         return;
1225
1226                 dev_err(&hif_dev->udev->dev,
1227                         "ath9k_htc: Failed to get firmware %s\n",
1228                         hif_dev->fw_name);
1229                 goto err_fw;
1230         }
1231
1232         hif_dev->htc_handle = ath9k_htc_hw_alloc(hif_dev, &hif_usb,
1233                                                  &hif_dev->udev->dev);
1234         if (hif_dev->htc_handle == NULL)
1235                 goto err_dev_alloc;
1236
1237         hif_dev->fw_data = fw->data;
1238         hif_dev->fw_size = fw->size;
1239
1240         /* Proceed with initialization */
1241
1242         ret = ath9k_hif_usb_dev_init(hif_dev);
1243         if (ret)
1244                 goto err_dev_init;
1245
1246         ret = ath9k_htc_hw_init(hif_dev->htc_handle,
1247                                 &hif_dev->interface->dev,
1248                                 hif_dev->usb_device_id->idProduct,
1249                                 hif_dev->udev->product,
1250                                 hif_dev->usb_device_id->driver_info);
1251         if (ret) {
1252                 ret = -EINVAL;
1253                 goto err_htc_hw_init;
1254         }
1255
1256         release_firmware(fw);
1257         hif_dev->flags |= HIF_USB_READY;
1258         complete_all(&hif_dev->fw_done);
1259
1260         return;
1261
1262 err_htc_hw_init:
1263         ath9k_hif_usb_dev_deinit(hif_dev);
1264 err_dev_init:
1265         ath9k_htc_hw_free(hif_dev->htc_handle);
1266 err_dev_alloc:
1267         release_firmware(fw);
1268 err_fw:
1269         ath9k_hif_usb_firmware_fail(hif_dev);
1270 }
1271
1272 /*
1273  * An exact copy of the function from zd1211rw.
1274  */
1275 static int send_eject_command(struct usb_interface *interface)
1276 {
1277         struct usb_device *udev = interface_to_usbdev(interface);
1278         struct usb_host_interface *iface_desc = interface->cur_altsetting;
1279         struct usb_endpoint_descriptor *endpoint;
1280         unsigned char *cmd;
1281         u8 bulk_out_ep;
1282         int r;
1283
1284         if (iface_desc->desc.bNumEndpoints < 2)
1285                 return -ENODEV;
1286
1287         /* Find bulk out endpoint */
1288         for (r = 1; r >= 0; r--) {
1289                 endpoint = &iface_desc->endpoint[r].desc;
1290                 if (usb_endpoint_dir_out(endpoint) &&
1291                     usb_endpoint_xfer_bulk(endpoint)) {
1292                         bulk_out_ep = endpoint->bEndpointAddress;
1293                         break;
1294                 }
1295         }
1296         if (r == -1) {
1297                 dev_err(&udev->dev,
1298                         "ath9k_htc: Could not find bulk out endpoint\n");
1299                 return -ENODEV;
1300         }
1301
1302         cmd = kzalloc(31, GFP_KERNEL);
1303         if (cmd == NULL)
1304                 return -ENODEV;
1305
1306         /* USB bulk command block */
1307         cmd[0] = 0x55;  /* bulk command signature */
1308         cmd[1] = 0x53;  /* bulk command signature */
1309         cmd[2] = 0x42;  /* bulk command signature */
1310         cmd[3] = 0x43;  /* bulk command signature */
1311         cmd[14] = 6;    /* command length */
1312
1313         cmd[15] = 0x1b; /* SCSI command: START STOP UNIT */
1314         cmd[19] = 0x2;  /* eject disc */
1315
1316         dev_info(&udev->dev, "Ejecting storage device...\n");
1317         r = usb_bulk_msg(udev, usb_sndbulkpipe(udev, bulk_out_ep),
1318                 cmd, 31, NULL, 2 * USB_MSG_TIMEOUT);
1319         kfree(cmd);
1320         if (r)
1321                 return r;
1322
1323         /* At this point, the device disconnects and reconnects with the real
1324          * ID numbers. */
1325
1326         usb_set_intfdata(interface, NULL);
1327         return 0;
1328 }
1329
1330 static int ath9k_hif_usb_probe(struct usb_interface *interface,
1331                                const struct usb_device_id *id)
1332 {
1333         struct usb_device *udev = interface_to_usbdev(interface);
1334         struct hif_device_usb *hif_dev;
1335         int ret = 0;
1336
1337         if (id->driver_info == STORAGE_DEVICE)
1338                 return send_eject_command(interface);
1339
1340         hif_dev = kzalloc(sizeof(struct hif_device_usb), GFP_KERNEL);
1341         if (!hif_dev) {
1342                 ret = -ENOMEM;
1343                 goto err_alloc;
1344         }
1345
1346         usb_get_dev(udev);
1347
1348         hif_dev->udev = udev;
1349         hif_dev->interface = interface;
1350         hif_dev->usb_device_id = id;
1351 #ifdef CONFIG_PM
1352         udev->reset_resume = 1;
1353 #endif
1354         usb_set_intfdata(interface, hif_dev);
1355
1356         init_completion(&hif_dev->fw_done);
1357
1358         ret = ath9k_hif_request_firmware(hif_dev, true);
1359         if (ret)
1360                 goto err_fw_req;
1361
1362         return ret;
1363
1364 err_fw_req:
1365         usb_set_intfdata(interface, NULL);
1366         kfree(hif_dev);
1367         usb_put_dev(udev);
1368 err_alloc:
1369         return ret;
1370 }
1371
1372 static void ath9k_hif_usb_reboot(struct usb_device *udev)
1373 {
1374         u32 reboot_cmd = 0xffffffff;
1375         void *buf;
1376         int ret;
1377
1378         buf = kmemdup(&reboot_cmd, 4, GFP_KERNEL);
1379         if (!buf)
1380                 return;
1381
1382         ret = usb_interrupt_msg(udev, usb_sndintpipe(udev, USB_REG_OUT_PIPE),
1383                            buf, 4, NULL, USB_MSG_TIMEOUT);
1384         if (ret)
1385                 dev_err(&udev->dev, "ath9k_htc: USB reboot failed\n");
1386
1387         kfree(buf);
1388 }
1389
1390 static void ath9k_hif_usb_disconnect(struct usb_interface *interface)
1391 {
1392         struct usb_device *udev = interface_to_usbdev(interface);
1393         struct hif_device_usb *hif_dev = usb_get_intfdata(interface);
1394         bool unplugged = (udev->state == USB_STATE_NOTATTACHED) ? true : false;
1395
1396         if (!hif_dev)
1397                 return;
1398
1399         wait_for_completion(&hif_dev->fw_done);
1400
1401         if (hif_dev->flags & HIF_USB_READY) {
1402                 ath9k_htc_hw_deinit(hif_dev->htc_handle, unplugged);
1403                 ath9k_hif_usb_dev_deinit(hif_dev);
1404                 ath9k_destoy_wmi(hif_dev->htc_handle->drv_priv);
1405                 ath9k_htc_hw_free(hif_dev->htc_handle);
1406         }
1407
1408         usb_set_intfdata(interface, NULL);
1409
1410         /* If firmware was loaded we should drop it
1411          * go back to first stage bootloader. */
1412         if (!unplugged && (hif_dev->flags & HIF_USB_READY))
1413                 ath9k_hif_usb_reboot(udev);
1414
1415         kfree(hif_dev);
1416         dev_info(&udev->dev, "ath9k_htc: USB layer deinitialized\n");
1417         usb_put_dev(udev);
1418 }
1419
1420 #ifdef CONFIG_PM
1421 static int ath9k_hif_usb_suspend(struct usb_interface *interface,
1422                                  pm_message_t message)
1423 {
1424         struct hif_device_usb *hif_dev = usb_get_intfdata(interface);
1425
1426         /*
1427          * The device has to be set to FULLSLEEP mode in case no
1428          * interface is up.
1429          */
1430         if (!(hif_dev->flags & HIF_USB_START))
1431                 ath9k_htc_suspend(hif_dev->htc_handle);
1432
1433         wait_for_completion(&hif_dev->fw_done);
1434
1435         if (hif_dev->flags & HIF_USB_READY)
1436                 ath9k_hif_usb_dealloc_urbs(hif_dev);
1437
1438         return 0;
1439 }
1440
1441 static int ath9k_hif_usb_resume(struct usb_interface *interface)
1442 {
1443         struct hif_device_usb *hif_dev = usb_get_intfdata(interface);
1444         struct htc_target *htc_handle = hif_dev->htc_handle;
1445         int ret;
1446         const struct firmware *fw;
1447
1448         ret = ath9k_hif_usb_alloc_urbs(hif_dev);
1449         if (ret)
1450                 return ret;
1451
1452         if (hif_dev->flags & HIF_USB_READY) {
1453                 /* request cached firmware during suspend/resume cycle */
1454                 ret = request_firmware(&fw, hif_dev->fw_name,
1455                                        &hif_dev->udev->dev);
1456                 if (ret)
1457                         goto fail_resume;
1458
1459                 hif_dev->fw_data = fw->data;
1460                 hif_dev->fw_size = fw->size;
1461                 ret = ath9k_hif_usb_download_fw(hif_dev);
1462                 release_firmware(fw);
1463                 if (ret)
1464                         goto fail_resume;
1465         } else {
1466                 ath9k_hif_usb_dealloc_urbs(hif_dev);
1467                 return -EIO;
1468         }
1469
1470         mdelay(100);
1471
1472         ret = ath9k_htc_resume(htc_handle);
1473
1474         if (ret)
1475                 goto fail_resume;
1476
1477         return 0;
1478
1479 fail_resume:
1480         ath9k_hif_usb_dealloc_urbs(hif_dev);
1481
1482         return ret;
1483 }
1484 #endif
1485
1486 static struct usb_driver ath9k_hif_usb_driver = {
1487         .name = KBUILD_MODNAME,
1488         .probe = ath9k_hif_usb_probe,
1489         .disconnect = ath9k_hif_usb_disconnect,
1490 #ifdef CONFIG_PM
1491         .suspend = ath9k_hif_usb_suspend,
1492         .resume = ath9k_hif_usb_resume,
1493         .reset_resume = ath9k_hif_usb_resume,
1494 #endif
1495         .id_table = ath9k_hif_usb_ids,
1496         .soft_unbind = 1,
1497         .disable_hub_initiated_lpm = 1,
1498 };
1499
1500 int ath9k_hif_usb_init(void)
1501 {
1502         return usb_register(&ath9k_hif_usb_driver);
1503 }
1504
1505 void ath9k_hif_usb_exit(void)
1506 {
1507         usb_deregister(&ath9k_hif_usb_driver);
1508 }