Version:  2.0.40 2.2.26 2.4.37 3.0 3.1 3.2 3.3 3.4 3.5 3.6 3.7 3.8 3.9 3.10 3.11 3.12 3.13 3.14 3.15 3.16

Linux/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 /* identify firmware images */
 21 #define FIRMWARE_AR7010_1_1     "htc_7010.fw"
 22 #define FIRMWARE_AR9271         "htc_9271.fw"
 23 
 24 MODULE_FIRMWARE(FIRMWARE_AR7010_1_1);
 25 MODULE_FIRMWARE(FIRMWARE_AR9271);
 26 
 27 static struct usb_device_id ath9k_hif_usb_ids[] = {
 28         { USB_DEVICE(0x0cf3, 0x9271) }, /* Atheros */
 29         { USB_DEVICE(0x0cf3, 0x1006) }, /* Atheros */
 30         { USB_DEVICE(0x0846, 0x9030) }, /* Netgear N150 */
 31         { USB_DEVICE(0x07D1, 0x3A10) }, /* Dlink Wireless 150 */
 32         { USB_DEVICE(0x13D3, 0x3327) }, /* Azurewave */
 33         { USB_DEVICE(0x13D3, 0x3328) }, /* Azurewave */
 34         { USB_DEVICE(0x13D3, 0x3346) }, /* IMC Networks */
 35         { USB_DEVICE(0x13D3, 0x3348) }, /* Azurewave */
 36         { USB_DEVICE(0x13D3, 0x3349) }, /* Azurewave */
 37         { USB_DEVICE(0x13D3, 0x3350) }, /* Azurewave */
 38         { USB_DEVICE(0x04CA, 0x4605) }, /* Liteon */
 39         { USB_DEVICE(0x040D, 0x3801) }, /* VIA */
 40         { USB_DEVICE(0x0cf3, 0xb003) }, /* Ubiquiti WifiStation Ext */
 41         { USB_DEVICE(0x0cf3, 0xb002) }, /* Ubiquiti WifiStation */
 42         { USB_DEVICE(0x057c, 0x8403) }, /* AVM FRITZ!WLAN 11N v2 USB */
 43 
 44         { USB_DEVICE(0x0cf3, 0x7015),
 45           .driver_info = AR9287_USB },  /* Atheros */
 46         { USB_DEVICE(0x1668, 0x1200),
 47           .driver_info = AR9287_USB },  /* Verizon */
 48 
 49         { USB_DEVICE(0x0cf3, 0x7010),
 50           .driver_info = AR9280_USB },  /* Atheros */
 51         { USB_DEVICE(0x0846, 0x9018),
 52           .driver_info = AR9280_USB },  /* Netgear WNDA3200 */
 53         { USB_DEVICE(0x083A, 0xA704),
 54           .driver_info = AR9280_USB },  /* SMC Networks */
 55         { USB_DEVICE(0x0411, 0x017f),
 56           .driver_info = AR9280_USB },  /* Sony UWA-BR100 */
 57         { USB_DEVICE(0x0411, 0x0197),
 58           .driver_info = AR9280_USB },  /* Buffalo WLI-UV-AG300P */
 59         { USB_DEVICE(0x04da, 0x3904),
 60           .driver_info = AR9280_USB },
 61 
 62         { USB_DEVICE(0x0cf3, 0x20ff),
 63           .driver_info = STORAGE_DEVICE },
 64 
 65         { },
 66 };
 67 
 68 MODULE_DEVICE_TABLE(usb, ath9k_hif_usb_ids);
 69 
 70 static int __hif_usb_tx(struct hif_device_usb *hif_dev);
 71 
 72 static void hif_usb_regout_cb(struct urb *urb)
 73 {
 74         struct cmd_buf *cmd = (struct cmd_buf *)urb->context;
 75 
 76         switch (urb->status) {
 77         case 0:
 78                 break;
 79         case -ENOENT:
 80         case -ECONNRESET:
 81         case -ENODEV:
 82         case -ESHUTDOWN:
 83                 goto free;
 84         default:
 85                 break;
 86         }
 87 
 88         if (cmd) {
 89                 ath9k_htc_txcompletion_cb(cmd->hif_dev->htc_handle,
 90                                           cmd->skb, true);
 91                 kfree(cmd);
 92         }
 93 
 94         return;
 95 free:
 96         kfree_skb(cmd->skb);
 97         kfree(cmd);
 98 }
 99 
100 static int hif_usb_send_regout(struct hif_device_usb *hif_dev,
101                                struct sk_buff *skb)
102 {
103         struct urb *urb;
104         struct cmd_buf *cmd;
105         int ret = 0;
106 
107         urb = usb_alloc_urb(0, GFP_KERNEL);
108         if (urb == NULL)
109                 return -ENOMEM;
110 
111         cmd = kzalloc(sizeof(*cmd), GFP_KERNEL);
112         if (cmd == NULL) {
113                 usb_free_urb(urb);
114                 return -ENOMEM;
115         }
116 
117         cmd->skb = skb;
118         cmd->hif_dev = hif_dev;
119 
120         usb_fill_int_urb(urb, hif_dev->udev,
121                          usb_sndintpipe(hif_dev->udev, USB_REG_OUT_PIPE),
122                          skb->data, skb->len,
123                          hif_usb_regout_cb, cmd, 1);
124 
125         usb_anchor_urb(urb, &hif_dev->regout_submitted);
126         ret = usb_submit_urb(urb, GFP_KERNEL);
127         if (ret) {
128                 usb_unanchor_urb(urb);
129                 kfree(cmd);
130         }
131         usb_free_urb(urb);
132 
133         return ret;
134 }
135 
136 static void hif_usb_mgmt_cb(struct urb *urb)
137 {
138         struct cmd_buf *cmd = (struct cmd_buf *)urb->context;
139         struct hif_device_usb *hif_dev;
140         bool txok = true;
141 
142         if (!cmd || !cmd->skb || !cmd->hif_dev)
143                 return;
144 
145         hif_dev = cmd->hif_dev;
146 
147         switch (urb->status) {
148         case 0:
149                 break;
150         case -ENOENT:
151         case -ECONNRESET:
152         case -ENODEV:
153         case -ESHUTDOWN:
154                 txok = false;
155 
156                 /*
157                  * If the URBs are being flushed, no need to complete
158                  * this packet.
159                  */
160                 spin_lock(&hif_dev->tx.tx_lock);
161                 if (hif_dev->tx.flags & HIF_USB_TX_FLUSH) {
162                         spin_unlock(&hif_dev->tx.tx_lock);
163                         dev_kfree_skb_any(cmd->skb);
164                         kfree(cmd);
165                         return;
166                 }
167                 spin_unlock(&hif_dev->tx.tx_lock);
168 
169                 break;
170         default:
171                 txok = false;
172                 break;
173         }
174 
175         skb_pull(cmd->skb, 4);
176         ath9k_htc_txcompletion_cb(cmd->hif_dev->htc_handle,
177                                   cmd->skb, txok);
178         kfree(cmd);
179 }
180 
181 static int hif_usb_send_mgmt(struct hif_device_usb *hif_dev,
182                              struct sk_buff *skb)
183 {
184         struct urb *urb;
185         struct cmd_buf *cmd;
186         int ret = 0;
187         __le16 *hdr;
188 
189         urb = usb_alloc_urb(0, GFP_ATOMIC);
190         if (urb == NULL)
191                 return -ENOMEM;
192 
193         cmd = kzalloc(sizeof(*cmd), GFP_ATOMIC);
194         if (cmd == NULL) {
195                 usb_free_urb(urb);
196                 return -ENOMEM;
197         }
198 
199         cmd->skb = skb;
200         cmd->hif_dev = hif_dev;
201 
202         hdr = (__le16 *) skb_push(skb, 4);
203         *hdr++ = cpu_to_le16(skb->len - 4);
204         *hdr++ = cpu_to_le16(ATH_USB_TX_STREAM_MODE_TAG);
205 
206         usb_fill_bulk_urb(urb, hif_dev->udev,
207                          usb_sndbulkpipe(hif_dev->udev, USB_WLAN_TX_PIPE),
208                          skb->data, skb->len,
209                          hif_usb_mgmt_cb, cmd);
210 
211         usb_anchor_urb(urb, &hif_dev->mgmt_submitted);
212         ret = usb_submit_urb(urb, GFP_ATOMIC);
213         if (ret) {
214                 usb_unanchor_urb(urb);
215                 kfree(cmd);
216         }
217         usb_free_urb(urb);
218 
219         return ret;
220 }
221 
222 static inline void ath9k_skb_queue_purge(struct hif_device_usb *hif_dev,
223                                          struct sk_buff_head *list)
224 {
225         struct sk_buff *skb;
226 
227         while ((skb = __skb_dequeue(list)) != NULL) {
228                 dev_kfree_skb_any(skb);
229         }
230 }
231 
232 static inline void ath9k_skb_queue_complete(struct hif_device_usb *hif_dev,
233                                             struct sk_buff_head *queue,
234                                             bool txok)
235 {
236         struct sk_buff *skb;
237 
238         while ((skb = __skb_dequeue(queue)) != NULL) {
239 #ifdef CONFIG_ATH9K_HTC_DEBUGFS
240                 int ln = skb->len;
241 #endif
242                 ath9k_htc_txcompletion_cb(hif_dev->htc_handle,
243                                           skb, txok);
244                 if (txok) {
245                         TX_STAT_INC(skb_success);
246                         TX_STAT_ADD(skb_success_bytes, ln);
247                 }
248                 else
249                         TX_STAT_INC(skb_failed);
250         }
251 }
252 
253 static void hif_usb_tx_cb(struct urb *urb)
254 {
255         struct tx_buf *tx_buf = (struct tx_buf *) urb->context;
256         struct hif_device_usb *hif_dev;
257         bool txok = true;
258 
259         if (!tx_buf || !tx_buf->hif_dev)
260                 return;
261 
262         hif_dev = tx_buf->hif_dev;
263 
264         switch (urb->status) {
265         case 0:
266                 break;
267         case -ENOENT:
268         case -ECONNRESET:
269         case -ENODEV:
270         case -ESHUTDOWN:
271                 txok = false;
272 
273                 /*
274                  * If the URBs are being flushed, no need to add this
275                  * URB to the free list.
276                  */
277                 spin_lock(&hif_dev->tx.tx_lock);
278                 if (hif_dev->tx.flags & HIF_USB_TX_FLUSH) {
279                         spin_unlock(&hif_dev->tx.tx_lock);
280                         ath9k_skb_queue_purge(hif_dev, &tx_buf->skb_queue);
281                         return;
282                 }
283                 spin_unlock(&hif_dev->tx.tx_lock);
284 
285                 break;
286         default:
287                 txok = false;
288                 break;
289         }
290 
291         ath9k_skb_queue_complete(hif_dev, &tx_buf->skb_queue, txok);
292 
293         /* Re-initialize the SKB queue */
294         tx_buf->len = tx_buf->offset = 0;
295         __skb_queue_head_init(&tx_buf->skb_queue);
296 
297         /* Add this TX buffer to the free list */
298         spin_lock(&hif_dev->tx.tx_lock);
299         list_move_tail(&tx_buf->list, &hif_dev->tx.tx_buf);
300         hif_dev->tx.tx_buf_cnt++;
301         if (!(hif_dev->tx.flags & HIF_USB_TX_STOP))
302                 __hif_usb_tx(hif_dev); /* Check for pending SKBs */
303         TX_STAT_INC(buf_completed);
304         spin_unlock(&hif_dev->tx.tx_lock);
305 }
306 
307 /* TX lock has to be taken */
308 static int __hif_usb_tx(struct hif_device_usb *hif_dev)
309 {
310         struct tx_buf *tx_buf = NULL;
311         struct sk_buff *nskb = NULL;
312         int ret = 0, i;
313         u16 tx_skb_cnt = 0;
314         u8 *buf;
315         __le16 *hdr;
316 
317         if (hif_dev->tx.tx_skb_cnt == 0)
318                 return 0;
319 
320         /* Check if a free TX buffer is available */
321         if (list_empty(&hif_dev->tx.tx_buf))
322                 return 0;
323 
324         tx_buf = list_first_entry(&hif_dev->tx.tx_buf, struct tx_buf, list);
325         list_move_tail(&tx_buf->list, &hif_dev->tx.tx_pending);
326         hif_dev->tx.tx_buf_cnt--;
327 
328         tx_skb_cnt = min_t(u16, hif_dev->tx.tx_skb_cnt, MAX_TX_AGGR_NUM);
329 
330         for (i = 0; i < tx_skb_cnt; i++) {
331                 nskb = __skb_dequeue(&hif_dev->tx.tx_skb_queue);
332 
333                 /* Should never be NULL */
334                 BUG_ON(!nskb);
335 
336                 hif_dev->tx.tx_skb_cnt--;
337 
338                 buf = tx_buf->buf;
339                 buf += tx_buf->offset;
340                 hdr = (__le16 *)buf;
341                 *hdr++ = cpu_to_le16(nskb->len);
342                 *hdr++ = cpu_to_le16(ATH_USB_TX_STREAM_MODE_TAG);
343                 buf += 4;
344                 memcpy(buf, nskb->data, nskb->len);
345                 tx_buf->len = nskb->len + 4;
346 
347                 if (i < (tx_skb_cnt - 1))
348                         tx_buf->offset += (((tx_buf->len - 1) / 4) + 1) * 4;
349 
350                 if (i == (tx_skb_cnt - 1))
351                         tx_buf->len += tx_buf->offset;
352 
353                 __skb_queue_tail(&tx_buf->skb_queue, nskb);
354                 TX_STAT_INC(skb_queued);
355         }
356 
357         usb_fill_bulk_urb(tx_buf->urb, hif_dev->udev,
358                           usb_sndbulkpipe(hif_dev->udev, USB_WLAN_TX_PIPE),
359                           tx_buf->buf, tx_buf->len,
360                           hif_usb_tx_cb, tx_buf);
361 
362         ret = usb_submit_urb(tx_buf->urb, GFP_ATOMIC);
363         if (ret) {
364                 tx_buf->len = tx_buf->offset = 0;
365                 ath9k_skb_queue_complete(hif_dev, &tx_buf->skb_queue, false);
366                 __skb_queue_head_init(&tx_buf->skb_queue);
367                 list_move_tail(&tx_buf->list, &hif_dev->tx.tx_buf);
368                 hif_dev->tx.tx_buf_cnt++;
369         }
370 
371         if (!ret)
372                 TX_STAT_INC(buf_queued);
373 
374         return ret;
375 }
376 
377 static int hif_usb_send_tx(struct hif_device_usb *hif_dev, struct sk_buff *skb)
378 {
379         struct ath9k_htc_tx_ctl *tx_ctl;
380         unsigned long flags;
381         int ret = 0;
382 
383         spin_lock_irqsave(&hif_dev->tx.tx_lock, flags);
384 
385         if (hif_dev->tx.flags & HIF_USB_TX_STOP) {
386                 spin_unlock_irqrestore(&hif_dev->tx.tx_lock, flags);
387                 return -ENODEV;
388         }
389 
390         /* Check if the max queue count has been reached */
391         if (hif_dev->tx.tx_skb_cnt > MAX_TX_BUF_NUM) {
392                 spin_unlock_irqrestore(&hif_dev->tx.tx_lock, flags);
393                 return -ENOMEM;
394         }
395 
396         spin_unlock_irqrestore(&hif_dev->tx.tx_lock, flags);
397 
398         tx_ctl = HTC_SKB_CB(skb);
399 
400         /* Mgmt/Beacon frames don't use the TX buffer pool */
401         if ((tx_ctl->type == ATH9K_HTC_MGMT) ||
402             (tx_ctl->type == ATH9K_HTC_BEACON)) {
403                 ret = hif_usb_send_mgmt(hif_dev, skb);
404         }
405 
406         spin_lock_irqsave(&hif_dev->tx.tx_lock, flags);
407 
408         if ((tx_ctl->type == ATH9K_HTC_NORMAL) ||
409             (tx_ctl->type == ATH9K_HTC_AMPDU)) {
410                 __skb_queue_tail(&hif_dev->tx.tx_skb_queue, skb);
411                 hif_dev->tx.tx_skb_cnt++;
412         }
413 
414         /* Check if AMPDUs have to be sent immediately */
415         if ((hif_dev->tx.tx_buf_cnt == MAX_TX_URB_NUM) &&
416             (hif_dev->tx.tx_skb_cnt < 2)) {
417                 __hif_usb_tx(hif_dev);
418         }
419 
420         spin_unlock_irqrestore(&hif_dev->tx.tx_lock, flags);
421 
422         return ret;
423 }
424 
425 static void hif_usb_start(void *hif_handle)
426 {
427         struct hif_device_usb *hif_dev = (struct hif_device_usb *)hif_handle;
428         unsigned long flags;
429 
430         hif_dev->flags |= HIF_USB_START;
431 
432         spin_lock_irqsave(&hif_dev->tx.tx_lock, flags);
433         hif_dev->tx.flags &= ~HIF_USB_TX_STOP;
434         spin_unlock_irqrestore(&hif_dev->tx.tx_lock, flags);
435 }
436 
437 static void hif_usb_stop(void *hif_handle)
438 {
439         struct hif_device_usb *hif_dev = (struct hif_device_usb *)hif_handle;
440         struct tx_buf *tx_buf = NULL, *tx_buf_tmp = NULL;
441         unsigned long flags;
442 
443         spin_lock_irqsave(&hif_dev->tx.tx_lock, flags);
444         ath9k_skb_queue_complete(hif_dev, &hif_dev->tx.tx_skb_queue, false);
445         hif_dev->tx.tx_skb_cnt = 0;
446         hif_dev->tx.flags |= HIF_USB_TX_STOP;
447         spin_unlock_irqrestore(&hif_dev->tx.tx_lock, flags);
448 
449         /* The pending URBs have to be canceled. */
450         list_for_each_entry_safe(tx_buf, tx_buf_tmp,
451                                  &hif_dev->tx.tx_pending, list) {
452                 usb_kill_urb(tx_buf->urb);
453         }
454 
455         usb_kill_anchored_urbs(&hif_dev->mgmt_submitted);
456 }
457 
458 static int hif_usb_send(void *hif_handle, u8 pipe_id, struct sk_buff *skb)
459 {
460         struct hif_device_usb *hif_dev = (struct hif_device_usb *)hif_handle;
461         int ret = 0;
462 
463         switch (pipe_id) {
464         case USB_WLAN_TX_PIPE:
465                 ret = hif_usb_send_tx(hif_dev, skb);
466                 break;
467         case USB_REG_OUT_PIPE:
468                 ret = hif_usb_send_regout(hif_dev, skb);
469                 break;
470         default:
471                 dev_err(&hif_dev->udev->dev,
472                         "ath9k_htc: Invalid TX pipe: %d\n", pipe_id);
473                 ret = -EINVAL;
474                 break;
475         }
476 
477         return ret;
478 }
479 
480 static inline bool check_index(struct sk_buff *skb, u8 idx)
481 {
482         struct ath9k_htc_tx_ctl *tx_ctl;
483 
484         tx_ctl = HTC_SKB_CB(skb);
485 
486         if ((tx_ctl->type == ATH9K_HTC_AMPDU) &&
487             (tx_ctl->sta_idx == idx))
488                 return true;
489 
490         return false;
491 }
492 
493 static void hif_usb_sta_drain(void *hif_handle, u8 idx)
494 {
495         struct hif_device_usb *hif_dev = (struct hif_device_usb *)hif_handle;
496         struct sk_buff *skb, *tmp;
497         unsigned long flags;
498 
499         spin_lock_irqsave(&hif_dev->tx.tx_lock, flags);
500 
501         skb_queue_walk_safe(&hif_dev->tx.tx_skb_queue, skb, tmp) {
502                 if (check_index(skb, idx)) {
503                         __skb_unlink(skb, &hif_dev->tx.tx_skb_queue);
504                         ath9k_htc_txcompletion_cb(hif_dev->htc_handle,
505                                                   skb, false);
506                         hif_dev->tx.tx_skb_cnt--;
507                         TX_STAT_INC(skb_failed);
508                 }
509         }
510 
511         spin_unlock_irqrestore(&hif_dev->tx.tx_lock, flags);
512 }
513 
514 static struct ath9k_htc_hif hif_usb = {
515         .transport = ATH9K_HIF_USB,
516         .name = "ath9k_hif_usb",
517 
518         .control_ul_pipe = USB_REG_OUT_PIPE,
519         .control_dl_pipe = USB_REG_IN_PIPE,
520 
521         .start = hif_usb_start,
522         .stop = hif_usb_stop,
523         .sta_drain = hif_usb_sta_drain,
524         .send = hif_usb_send,
525 };
526 
527 static void ath9k_hif_usb_rx_stream(struct hif_device_usb *hif_dev,
528                                     struct sk_buff *skb)
529 {
530         struct sk_buff *nskb, *skb_pool[MAX_PKT_NUM_IN_TRANSFER];
531         int index = 0, i = 0, len = skb->len;
532         int rx_remain_len, rx_pkt_len;
533         u16 pool_index = 0;
534         u8 *ptr;
535 
536         spin_lock(&hif_dev->rx_lock);
537 
538         rx_remain_len = hif_dev->rx_remain_len;
539         rx_pkt_len = hif_dev->rx_transfer_len;
540 
541         if (rx_remain_len != 0) {
542                 struct sk_buff *remain_skb = hif_dev->remain_skb;
543 
544                 if (remain_skb) {
545                         ptr = (u8 *) remain_skb->data;
546 
547                         index = rx_remain_len;
548                         rx_remain_len -= hif_dev->rx_pad_len;
549                         ptr += rx_pkt_len;
550 
551                         memcpy(ptr, skb->data, rx_remain_len);
552 
553                         rx_pkt_len += rx_remain_len;
554                         hif_dev->rx_remain_len = 0;
555                         skb_put(remain_skb, rx_pkt_len);
556 
557                         skb_pool[pool_index++] = remain_skb;
558 
559                 } else {
560                         index = rx_remain_len;
561                 }
562         }
563 
564         spin_unlock(&hif_dev->rx_lock);
565 
566         while (index < len) {
567                 u16 pkt_len;
568                 u16 pkt_tag;
569                 u16 pad_len;
570                 int chk_idx;
571 
572                 ptr = (u8 *) skb->data;
573 
574                 pkt_len = get_unaligned_le16(ptr + index);
575                 pkt_tag = get_unaligned_le16(ptr + index + 2);
576 
577                 if (pkt_tag != ATH_USB_RX_STREAM_MODE_TAG) {
578                         RX_STAT_INC(skb_dropped);
579                         return;
580                 }
581 
582                 pad_len = 4 - (pkt_len & 0x3);
583                 if (pad_len == 4)
584                         pad_len = 0;
585 
586                 chk_idx = index;
587                 index = index + 4 + pkt_len + pad_len;
588 
589                 if (index > MAX_RX_BUF_SIZE) {
590                         spin_lock(&hif_dev->rx_lock);
591                         hif_dev->rx_remain_len = index - MAX_RX_BUF_SIZE;
592                         hif_dev->rx_transfer_len =
593                                 MAX_RX_BUF_SIZE - chk_idx - 4;
594                         hif_dev->rx_pad_len = pad_len;
595 
596                         nskb = __dev_alloc_skb(pkt_len + 32, GFP_ATOMIC);
597                         if (!nskb) {
598                                 dev_err(&hif_dev->udev->dev,
599                                         "ath9k_htc: RX memory allocation error\n");
600                                 spin_unlock(&hif_dev->rx_lock);
601                                 goto err;
602                         }
603                         skb_reserve(nskb, 32);
604                         RX_STAT_INC(skb_allocated);
605 
606                         memcpy(nskb->data, &(skb->data[chk_idx+4]),
607                                hif_dev->rx_transfer_len);
608 
609                         /* Record the buffer pointer */
610                         hif_dev->remain_skb = nskb;
611                         spin_unlock(&hif_dev->rx_lock);
612                 } else {
613                         nskb = __dev_alloc_skb(pkt_len + 32, GFP_ATOMIC);
614                         if (!nskb) {
615                                 dev_err(&hif_dev->udev->dev,
616                                         "ath9k_htc: RX memory allocation error\n");
617                                 goto err;
618                         }
619                         skb_reserve(nskb, 32);
620                         RX_STAT_INC(skb_allocated);
621 
622                         memcpy(nskb->data, &(skb->data[chk_idx+4]), pkt_len);
623                         skb_put(nskb, pkt_len);
624                         skb_pool[pool_index++] = nskb;
625                 }
626         }
627 
628 err:
629         for (i = 0; i < pool_index; i++) {
630                 RX_STAT_ADD(skb_completed_bytes, skb_pool[i]->len);
631                 ath9k_htc_rx_msg(hif_dev->htc_handle, skb_pool[i],
632                                  skb_pool[i]->len, USB_WLAN_RX_PIPE);
633                 RX_STAT_INC(skb_completed);
634         }
635 }
636 
637 static void ath9k_hif_usb_rx_cb(struct urb *urb)
638 {
639         struct sk_buff *skb = (struct sk_buff *) urb->context;
640         struct hif_device_usb *hif_dev =
641                 usb_get_intfdata(usb_ifnum_to_if(urb->dev, 0));
642         int ret;
643 
644         if (!skb)
645                 return;
646 
647         if (!hif_dev)
648                 goto free;
649 
650         switch (urb->status) {
651         case 0:
652                 break;
653         case -ENOENT:
654         case -ECONNRESET:
655         case -ENODEV:
656         case -ESHUTDOWN:
657                 goto free;
658         default:
659                 goto resubmit;
660         }
661 
662         if (likely(urb->actual_length != 0)) {
663                 skb_put(skb, urb->actual_length);
664                 ath9k_hif_usb_rx_stream(hif_dev, skb);
665         }
666 
667 resubmit:
668         skb_reset_tail_pointer(skb);
669         skb_trim(skb, 0);
670 
671         usb_anchor_urb(urb, &hif_dev->rx_submitted);
672         ret = usb_submit_urb(urb, GFP_ATOMIC);
673         if (ret) {
674                 usb_unanchor_urb(urb);
675                 goto free;
676         }
677 
678         return;
679 free:
680         kfree_skb(skb);
681 }
682 
683 static void ath9k_hif_usb_reg_in_cb(struct urb *urb)
684 {
685         struct sk_buff *skb = (struct sk_buff *) urb->context;
686         struct sk_buff *nskb;
687         struct hif_device_usb *hif_dev =
688                 usb_get_intfdata(usb_ifnum_to_if(urb->dev, 0));
689         int ret;
690 
691         if (!skb)
692                 return;
693 
694         if (!hif_dev)
695                 goto free;
696 
697         switch (urb->status) {
698         case 0:
699                 break;
700         case -ENOENT:
701         case -ECONNRESET:
702         case -ENODEV:
703         case -ESHUTDOWN:
704                 goto free;
705         default:
706                 skb_reset_tail_pointer(skb);
707                 skb_trim(skb, 0);
708 
709                 goto resubmit;
710         }
711 
712         if (likely(urb->actual_length != 0)) {
713                 skb_put(skb, urb->actual_length);
714 
715                 /* Process the command first */
716                 ath9k_htc_rx_msg(hif_dev->htc_handle, skb,
717                                  skb->len, USB_REG_IN_PIPE);
718 
719 
720                 nskb = alloc_skb(MAX_REG_IN_BUF_SIZE, GFP_ATOMIC);
721                 if (!nskb) {
722                         dev_err(&hif_dev->udev->dev,
723                                 "ath9k_htc: REG_IN memory allocation failure\n");
724                         urb->context = NULL;
725                         return;
726                 }
727 
728                 usb_fill_int_urb(urb, hif_dev->udev,
729                                  usb_rcvintpipe(hif_dev->udev,
730                                                  USB_REG_IN_PIPE),
731                                  nskb->data, MAX_REG_IN_BUF_SIZE,
732                                  ath9k_hif_usb_reg_in_cb, nskb, 1);
733         }
734 
735 resubmit:
736         usb_anchor_urb(urb, &hif_dev->reg_in_submitted);
737         ret = usb_submit_urb(urb, GFP_ATOMIC);
738         if (ret) {
739                 usb_unanchor_urb(urb);
740                 goto free;
741         }
742 
743         return;
744 free:
745         kfree_skb(skb);
746         urb->context = NULL;
747 }
748 
749 static void ath9k_hif_usb_dealloc_tx_urbs(struct hif_device_usb *hif_dev)
750 {
751         struct tx_buf *tx_buf = NULL, *tx_buf_tmp = NULL;
752         unsigned long flags;
753 
754         list_for_each_entry_safe(tx_buf, tx_buf_tmp,
755                                  &hif_dev->tx.tx_buf, list) {
756                 usb_kill_urb(tx_buf->urb);
757                 list_del(&tx_buf->list);
758                 usb_free_urb(tx_buf->urb);
759                 kfree(tx_buf->buf);
760                 kfree(tx_buf);
761         }
762 
763         spin_lock_irqsave(&hif_dev->tx.tx_lock, flags);
764         hif_dev->tx.flags |= HIF_USB_TX_FLUSH;
765         spin_unlock_irqrestore(&hif_dev->tx.tx_lock, flags);
766 
767         list_for_each_entry_safe(tx_buf, tx_buf_tmp,
768                                  &hif_dev->tx.tx_pending, list) {
769                 usb_kill_urb(tx_buf->urb);
770                 list_del(&tx_buf->list);
771                 usb_free_urb(tx_buf->urb);
772                 kfree(tx_buf->buf);
773                 kfree(tx_buf);
774         }
775 
776         usb_kill_anchored_urbs(&hif_dev->mgmt_submitted);
777 }
778 
779 static int ath9k_hif_usb_alloc_tx_urbs(struct hif_device_usb *hif_dev)
780 {
781         struct tx_buf *tx_buf;
782         int i;
783 
784         INIT_LIST_HEAD(&hif_dev->tx.tx_buf);
785         INIT_LIST_HEAD(&hif_dev->tx.tx_pending);
786         spin_lock_init(&hif_dev->tx.tx_lock);
787         __skb_queue_head_init(&hif_dev->tx.tx_skb_queue);
788         init_usb_anchor(&hif_dev->mgmt_submitted);
789 
790         for (i = 0; i < MAX_TX_URB_NUM; i++) {
791                 tx_buf = kzalloc(sizeof(struct tx_buf), GFP_KERNEL);
792                 if (!tx_buf)
793                         goto err;
794 
795                 tx_buf->buf = kzalloc(MAX_TX_BUF_SIZE, GFP_KERNEL);
796                 if (!tx_buf->buf)
797                         goto err;
798 
799                 tx_buf->urb = usb_alloc_urb(0, GFP_KERNEL);
800                 if (!tx_buf->urb)
801                         goto err;
802 
803                 tx_buf->hif_dev = hif_dev;
804                 __skb_queue_head_init(&tx_buf->skb_queue);
805 
806                 list_add_tail(&tx_buf->list, &hif_dev->tx.tx_buf);
807         }
808 
809         hif_dev->tx.tx_buf_cnt = MAX_TX_URB_NUM;
810 
811         return 0;
812 err:
813         if (tx_buf) {
814                 kfree(tx_buf->buf);
815                 kfree(tx_buf);
816         }
817         ath9k_hif_usb_dealloc_tx_urbs(hif_dev);
818         return -ENOMEM;
819 }
820 
821 static void ath9k_hif_usb_dealloc_rx_urbs(struct hif_device_usb *hif_dev)
822 {
823         usb_kill_anchored_urbs(&hif_dev->rx_submitted);
824 }
825 
826 static int ath9k_hif_usb_alloc_rx_urbs(struct hif_device_usb *hif_dev)
827 {
828         struct urb *urb = NULL;
829         struct sk_buff *skb = NULL;
830         int i, ret;
831 
832         init_usb_anchor(&hif_dev->rx_submitted);
833         spin_lock_init(&hif_dev->rx_lock);
834 
835         for (i = 0; i < MAX_RX_URB_NUM; i++) {
836 
837                 /* Allocate URB */
838                 urb = usb_alloc_urb(0, GFP_KERNEL);
839                 if (urb == NULL) {
840                         ret = -ENOMEM;
841                         goto err_urb;
842                 }
843 
844                 /* Allocate buffer */
845                 skb = alloc_skb(MAX_RX_BUF_SIZE, GFP_KERNEL);
846                 if (!skb) {
847                         ret = -ENOMEM;
848                         goto err_skb;
849                 }
850 
851                 usb_fill_bulk_urb(urb, hif_dev->udev,
852                                   usb_rcvbulkpipe(hif_dev->udev,
853                                                   USB_WLAN_RX_PIPE),
854                                   skb->data, MAX_RX_BUF_SIZE,
855                                   ath9k_hif_usb_rx_cb, skb);
856 
857                 /* Anchor URB */
858                 usb_anchor_urb(urb, &hif_dev->rx_submitted);
859 
860                 /* Submit URB */
861                 ret = usb_submit_urb(urb, GFP_KERNEL);
862                 if (ret) {
863                         usb_unanchor_urb(urb);
864                         goto err_submit;
865                 }
866 
867                 /*
868                  * Drop reference count.
869                  * This ensures that the URB is freed when killing them.
870                  */
871                 usb_free_urb(urb);
872         }
873 
874         return 0;
875 
876 err_submit:
877         kfree_skb(skb);
878 err_skb:
879         usb_free_urb(urb);
880 err_urb:
881         ath9k_hif_usb_dealloc_rx_urbs(hif_dev);
882         return ret;
883 }
884 
885 static void ath9k_hif_usb_dealloc_reg_in_urbs(struct hif_device_usb *hif_dev)
886 {
887         usb_kill_anchored_urbs(&hif_dev->reg_in_submitted);
888 }
889 
890 static int ath9k_hif_usb_alloc_reg_in_urbs(struct hif_device_usb *hif_dev)
891 {
892         struct urb *urb = NULL;
893         struct sk_buff *skb = NULL;
894         int i, ret;
895 
896         init_usb_anchor(&hif_dev->reg_in_submitted);
897 
898         for (i = 0; i < MAX_REG_IN_URB_NUM; i++) {
899 
900                 /* Allocate URB */
901                 urb = usb_alloc_urb(0, GFP_KERNEL);
902                 if (urb == NULL) {
903                         ret = -ENOMEM;
904                         goto err_urb;
905                 }
906 
907                 /* Allocate buffer */
908                 skb = alloc_skb(MAX_REG_IN_BUF_SIZE, GFP_KERNEL);
909                 if (!skb) {
910                         ret = -ENOMEM;
911                         goto err_skb;
912                 }
913 
914                 usb_fill_int_urb(urb, hif_dev->udev,
915                                   usb_rcvintpipe(hif_dev->udev,
916                                                   USB_REG_IN_PIPE),
917                                   skb->data, MAX_REG_IN_BUF_SIZE,
918                                   ath9k_hif_usb_reg_in_cb, skb, 1);
919 
920                 /* Anchor URB */
921                 usb_anchor_urb(urb, &hif_dev->reg_in_submitted);
922 
923                 /* Submit URB */
924                 ret = usb_submit_urb(urb, GFP_KERNEL);
925                 if (ret) {
926                         usb_unanchor_urb(urb);
927                         goto err_submit;
928                 }
929 
930                 /*
931                  * Drop reference count.
932                  * This ensures that the URB is freed when killing them.
933                  */
934                 usb_free_urb(urb);
935         }
936 
937         return 0;
938 
939 err_submit:
940         kfree_skb(skb);
941 err_skb:
942         usb_free_urb(urb);
943 err_urb:
944         ath9k_hif_usb_dealloc_reg_in_urbs(hif_dev);
945         return ret;
946 }
947 
948 static int ath9k_hif_usb_alloc_urbs(struct hif_device_usb *hif_dev)
949 {
950         /* Register Write */
951         init_usb_anchor(&hif_dev->regout_submitted);
952 
953         /* TX */
954         if (ath9k_hif_usb_alloc_tx_urbs(hif_dev) < 0)
955                 goto err;
956 
957         /* RX */
958         if (ath9k_hif_usb_alloc_rx_urbs(hif_dev) < 0)
959                 goto err_rx;
960 
961         /* Register Read */
962         if (ath9k_hif_usb_alloc_reg_in_urbs(hif_dev) < 0)
963                 goto err_reg;
964 
965         return 0;
966 err_reg:
967         ath9k_hif_usb_dealloc_rx_urbs(hif_dev);
968 err_rx:
969         ath9k_hif_usb_dealloc_tx_urbs(hif_dev);
970 err:
971         return -ENOMEM;
972 }
973 
974 static void ath9k_hif_usb_dealloc_urbs(struct hif_device_usb *hif_dev)
975 {
976         usb_kill_anchored_urbs(&hif_dev->regout_submitted);
977         ath9k_hif_usb_dealloc_reg_in_urbs(hif_dev);
978         ath9k_hif_usb_dealloc_tx_urbs(hif_dev);
979         ath9k_hif_usb_dealloc_rx_urbs(hif_dev);
980 }
981 
982 static int ath9k_hif_usb_download_fw(struct hif_device_usb *hif_dev)
983 {
984         int transfer, err;
985         const void *data = hif_dev->fw_data;
986         size_t len = hif_dev->fw_size;
987         u32 addr = AR9271_FIRMWARE;
988         u8 *buf = kzalloc(4096, GFP_KERNEL);
989         u32 firm_offset;
990 
991         if (!buf)
992                 return -ENOMEM;
993 
994         while (len) {
995                 transfer = min_t(size_t, len, 4096);
996                 memcpy(buf, data, transfer);
997 
998                 err = usb_control_msg(hif_dev->udev,
999                                       usb_sndctrlpipe(hif_dev->udev, 0),
1000                                       FIRMWARE_DOWNLOAD, 0x40 | USB_DIR_OUT,
1001                                       addr >> 8, 0, buf, transfer, HZ);
1002                 if (err < 0) {
1003                         kfree(buf);
1004                         return err;
1005                 }
1006 
1007                 len -= transfer;
1008                 data += transfer;
1009                 addr += transfer;
1010         }
1011         kfree(buf);
1012 
1013         if (IS_AR7010_DEVICE(hif_dev->usb_device_id->driver_info))
1014                 firm_offset = AR7010_FIRMWARE_TEXT;
1015         else
1016                 firm_offset = AR9271_FIRMWARE_TEXT;
1017 
1018         /*
1019          * Issue FW download complete command to firmware.
1020          */
1021         err = usb_control_msg(hif_dev->udev, usb_sndctrlpipe(hif_dev->udev, 0),
1022                               FIRMWARE_DOWNLOAD_COMP,
1023                               0x40 | USB_DIR_OUT,
1024                               firm_offset >> 8, 0, NULL, 0, HZ);
1025         if (err)
1026                 return -EIO;
1027 
1028         dev_info(&hif_dev->udev->dev, "ath9k_htc: Transferred FW: %s, size: %ld\n",
1029                  hif_dev->fw_name, (unsigned long) hif_dev->fw_size);
1030 
1031         return 0;
1032 }
1033 
1034 static int ath9k_hif_usb_dev_init(struct hif_device_usb *hif_dev)
1035 {
1036         int ret;
1037 
1038         ret = ath9k_hif_usb_download_fw(hif_dev);
1039         if (ret) {
1040                 dev_err(&hif_dev->udev->dev,
1041                         "ath9k_htc: Firmware - %s download failed\n",
1042                         hif_dev->fw_name);
1043                 return ret;
1044         }
1045 
1046         /* Alloc URBs */
1047         ret = ath9k_hif_usb_alloc_urbs(hif_dev);
1048         if (ret) {
1049                 dev_err(&hif_dev->udev->dev,
1050                         "ath9k_htc: Unable to allocate URBs\n");
1051                 return ret;
1052         }
1053 
1054         return 0;
1055 }
1056 
1057 static void ath9k_hif_usb_dev_deinit(struct hif_device_usb *hif_dev)
1058 {
1059         ath9k_hif_usb_dealloc_urbs(hif_dev);
1060 }
1061 
1062 /*
1063  * If initialization fails or the FW cannot be retrieved,
1064  * detach the device.
1065  */
1066 static void ath9k_hif_usb_firmware_fail(struct hif_device_usb *hif_dev)
1067 {
1068         struct device *dev = &hif_dev->udev->dev;
1069         struct device *parent = dev->parent;
1070 
1071         complete_all(&hif_dev->fw_done);
1072 
1073         if (parent)
1074                 device_lock(parent);
1075 
1076         device_release_driver(dev);
1077 
1078         if (parent)
1079                 device_unlock(parent);
1080 }
1081 
1082 static void ath9k_hif_usb_firmware_cb(const struct firmware *fw, void *context)
1083 {
1084         struct hif_device_usb *hif_dev = context;
1085         int ret;
1086 
1087         if (!fw) {
1088                 dev_err(&hif_dev->udev->dev,
1089                         "ath9k_htc: Failed to get firmware %s\n",
1090                         hif_dev->fw_name);
1091                 goto err_fw;
1092         }
1093 
1094         hif_dev->htc_handle = ath9k_htc_hw_alloc(hif_dev, &hif_usb,
1095                                                  &hif_dev->udev->dev);
1096         if (hif_dev->htc_handle == NULL)
1097                 goto err_dev_alloc;
1098 
1099         hif_dev->fw_data = fw->data;
1100         hif_dev->fw_size = fw->size;
1101 
1102         /* Proceed with initialization */
1103 
1104         ret = ath9k_hif_usb_dev_init(hif_dev);
1105         if (ret)
1106                 goto err_dev_init;
1107 
1108         ret = ath9k_htc_hw_init(hif_dev->htc_handle,
1109                                 &hif_dev->interface->dev,
1110                                 hif_dev->usb_device_id->idProduct,
1111                                 hif_dev->udev->product,
1112                                 hif_dev->usb_device_id->driver_info);
1113         if (ret) {
1114                 ret = -EINVAL;
1115                 goto err_htc_hw_init;
1116         }
1117 
1118         release_firmware(fw);
1119         hif_dev->flags |= HIF_USB_READY;
1120         complete_all(&hif_dev->fw_done);
1121 
1122         return;
1123 
1124 err_htc_hw_init:
1125         ath9k_hif_usb_dev_deinit(hif_dev);
1126 err_dev_init:
1127         ath9k_htc_hw_free(hif_dev->htc_handle);
1128 err_dev_alloc:
1129         release_firmware(fw);
1130 err_fw:
1131         ath9k_hif_usb_firmware_fail(hif_dev);
1132 }
1133 
1134 /*
1135  * An exact copy of the function from zd1211rw.
1136  */
1137 static int send_eject_command(struct usb_interface *interface)
1138 {
1139         struct usb_device *udev = interface_to_usbdev(interface);
1140         struct usb_host_interface *iface_desc = &interface->altsetting[0];
1141         struct usb_endpoint_descriptor *endpoint;
1142         unsigned char *cmd;
1143         u8 bulk_out_ep;
1144         int r;
1145 
1146         /* Find bulk out endpoint */
1147         for (r = 1; r >= 0; r--) {
1148                 endpoint = &iface_desc->endpoint[r].desc;
1149                 if (usb_endpoint_dir_out(endpoint) &&
1150                     usb_endpoint_xfer_bulk(endpoint)) {
1151                         bulk_out_ep = endpoint->bEndpointAddress;
1152                         break;
1153                 }
1154         }
1155         if (r == -1) {
1156                 dev_err(&udev->dev,
1157                         "ath9k_htc: Could not find bulk out endpoint\n");
1158                 return -ENODEV;
1159         }
1160 
1161         cmd = kzalloc(31, GFP_KERNEL);
1162         if (cmd == NULL)
1163                 return -ENODEV;
1164 
1165         /* USB bulk command block */
1166         cmd[0] = 0x55;  /* bulk command signature */
1167         cmd[1] = 0x53;  /* bulk command signature */
1168         cmd[2] = 0x42;  /* bulk command signature */
1169         cmd[3] = 0x43;  /* bulk command signature */
1170         cmd[14] = 6;    /* command length */
1171 
1172         cmd[15] = 0x1b; /* SCSI command: START STOP UNIT */
1173         cmd[19] = 0x2;  /* eject disc */
1174 
1175         dev_info(&udev->dev, "Ejecting storage device...\n");
1176         r = usb_bulk_msg(udev, usb_sndbulkpipe(udev, bulk_out_ep),
1177                 cmd, 31, NULL, 2000);
1178         kfree(cmd);
1179         if (r)
1180                 return r;
1181 
1182         /* At this point, the device disconnects and reconnects with the real
1183          * ID numbers. */
1184 
1185         usb_set_intfdata(interface, NULL);
1186         return 0;
1187 }
1188 
1189 static int ath9k_hif_usb_probe(struct usb_interface *interface,
1190                                const struct usb_device_id *id)
1191 {
1192         struct usb_device *udev = interface_to_usbdev(interface);
1193         struct hif_device_usb *hif_dev;
1194         int ret = 0;
1195 
1196         if (id->driver_info == STORAGE_DEVICE)
1197                 return send_eject_command(interface);
1198 
1199         hif_dev = kzalloc(sizeof(struct hif_device_usb), GFP_KERNEL);
1200         if (!hif_dev) {
1201                 ret = -ENOMEM;
1202                 goto err_alloc;
1203         }
1204 
1205         usb_get_dev(udev);
1206 
1207         hif_dev->udev = udev;
1208         hif_dev->interface = interface;
1209         hif_dev->usb_device_id = id;
1210 #ifdef CONFIG_PM
1211         udev->reset_resume = 1;
1212 #endif
1213         usb_set_intfdata(interface, hif_dev);
1214 
1215         init_completion(&hif_dev->fw_done);
1216 
1217         /* Find out which firmware to load */
1218 
1219         if (IS_AR7010_DEVICE(id->driver_info))
1220                 hif_dev->fw_name = FIRMWARE_AR7010_1_1;
1221         else
1222                 hif_dev->fw_name = FIRMWARE_AR9271;
1223 
1224         ret = request_firmware_nowait(THIS_MODULE, true, hif_dev->fw_name,
1225                                       &hif_dev->udev->dev, GFP_KERNEL,
1226                                       hif_dev, ath9k_hif_usb_firmware_cb);
1227         if (ret) {
1228                 dev_err(&hif_dev->udev->dev,
1229                         "ath9k_htc: Async request for firmware %s failed\n",
1230                         hif_dev->fw_name);
1231                 goto err_fw_req;
1232         }
1233 
1234         dev_info(&hif_dev->udev->dev, "ath9k_htc: Firmware %s requested\n",
1235                  hif_dev->fw_name);
1236 
1237         return 0;
1238 
1239 err_fw_req:
1240         usb_set_intfdata(interface, NULL);
1241         kfree(hif_dev);
1242         usb_put_dev(udev);
1243 err_alloc:
1244         return ret;
1245 }
1246 
1247 static void ath9k_hif_usb_reboot(struct usb_device *udev)
1248 {
1249         u32 reboot_cmd = 0xffffffff;
1250         void *buf;
1251         int ret;
1252 
1253         buf = kmemdup(&reboot_cmd, 4, GFP_KERNEL);
1254         if (!buf)
1255                 return;
1256 
1257         ret = usb_interrupt_msg(udev, usb_sndintpipe(udev, USB_REG_OUT_PIPE),
1258                            buf, 4, NULL, HZ);
1259         if (ret)
1260                 dev_err(&udev->dev, "ath9k_htc: USB reboot failed\n");
1261 
1262         kfree(buf);
1263 }
1264 
1265 static void ath9k_hif_usb_disconnect(struct usb_interface *interface)
1266 {
1267         struct usb_device *udev = interface_to_usbdev(interface);
1268         struct hif_device_usb *hif_dev = usb_get_intfdata(interface);
1269         bool unplugged = (udev->state == USB_STATE_NOTATTACHED) ? true : false;
1270 
1271         if (!hif_dev)
1272                 return;
1273 
1274         wait_for_completion(&hif_dev->fw_done);
1275 
1276         if (hif_dev->flags & HIF_USB_READY) {
1277                 ath9k_htc_hw_deinit(hif_dev->htc_handle, unplugged);
1278                 ath9k_htc_hw_free(hif_dev->htc_handle);
1279                 ath9k_hif_usb_dev_deinit(hif_dev);
1280         }
1281 
1282         usb_set_intfdata(interface, NULL);
1283 
1284         /* If firmware was loaded we should drop it
1285          * go back to first stage bootloader. */
1286         if (!unplugged && (hif_dev->flags & HIF_USB_READY))
1287                 ath9k_hif_usb_reboot(udev);
1288 
1289         kfree(hif_dev);
1290         dev_info(&udev->dev, "ath9k_htc: USB layer deinitialized\n");
1291         usb_put_dev(udev);
1292 }
1293 
1294 #ifdef CONFIG_PM
1295 static int ath9k_hif_usb_suspend(struct usb_interface *interface,
1296                                  pm_message_t message)
1297 {
1298         struct hif_device_usb *hif_dev = usb_get_intfdata(interface);
1299 
1300         /*
1301          * The device has to be set to FULLSLEEP mode in case no
1302          * interface is up.
1303          */
1304         if (!(hif_dev->flags & HIF_USB_START))
1305                 ath9k_htc_suspend(hif_dev->htc_handle);
1306 
1307         wait_for_completion(&hif_dev->fw_done);
1308 
1309         if (hif_dev->flags & HIF_USB_READY)
1310                 ath9k_hif_usb_dealloc_urbs(hif_dev);
1311 
1312         return 0;
1313 }
1314 
1315 static int ath9k_hif_usb_resume(struct usb_interface *interface)
1316 {
1317         struct hif_device_usb *hif_dev = usb_get_intfdata(interface);
1318         struct htc_target *htc_handle = hif_dev->htc_handle;
1319         int ret;
1320         const struct firmware *fw;
1321 
1322         ret = ath9k_hif_usb_alloc_urbs(hif_dev);
1323         if (ret)
1324                 return ret;
1325 
1326         if (hif_dev->flags & HIF_USB_READY) {
1327                 /* request cached firmware during suspend/resume cycle */
1328                 ret = request_firmware(&fw, hif_dev->fw_name,
1329                                        &hif_dev->udev->dev);
1330                 if (ret)
1331                         goto fail_resume;
1332 
1333                 hif_dev->fw_data = fw->data;
1334                 hif_dev->fw_size = fw->size;
1335                 ret = ath9k_hif_usb_download_fw(hif_dev);
1336                 release_firmware(fw);
1337                 if (ret)
1338                         goto fail_resume;
1339         } else {
1340                 ath9k_hif_usb_dealloc_urbs(hif_dev);
1341                 return -EIO;
1342         }
1343 
1344         mdelay(100);
1345 
1346         ret = ath9k_htc_resume(htc_handle);
1347 
1348         if (ret)
1349                 goto fail_resume;
1350 
1351         return 0;
1352 
1353 fail_resume:
1354         ath9k_hif_usb_dealloc_urbs(hif_dev);
1355 
1356         return ret;
1357 }
1358 #endif
1359 
1360 static struct usb_driver ath9k_hif_usb_driver = {
1361         .name = KBUILD_MODNAME,
1362         .probe = ath9k_hif_usb_probe,
1363         .disconnect = ath9k_hif_usb_disconnect,
1364 #ifdef CONFIG_PM
1365         .suspend = ath9k_hif_usb_suspend,
1366         .resume = ath9k_hif_usb_resume,
1367         .reset_resume = ath9k_hif_usb_resume,
1368 #endif
1369         .id_table = ath9k_hif_usb_ids,
1370         .soft_unbind = 1,
1371         .disable_hub_initiated_lpm = 1,
1372 };
1373 
1374 int ath9k_hif_usb_init(void)
1375 {
1376         return usb_register(&ath9k_hif_usb_driver);
1377 }
1378 
1379 void ath9k_hif_usb_exit(void)
1380 {
1381         usb_deregister(&ath9k_hif_usb_driver);
1382 }
1383 

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