Version:  2.0.40 2.2.26 2.4.37 3.5 3.6 3.7 3.8 3.9 3.10 3.11 3.12 3.13 3.14 3.15 3.16 3.17 3.18 3.19 4.0 4.1

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         { USB_DEVICE(0x0471, 0x209e) }, /* Philips (or NXP) PTA01 */
 44 
 45         { USB_DEVICE(0x0cf3, 0x7015),
 46           .driver_info = AR9287_USB },  /* Atheros */
 47         { USB_DEVICE(0x1668, 0x1200),
 48           .driver_info = AR9287_USB },  /* Verizon */
 49 
 50         { USB_DEVICE(0x0cf3, 0x7010),
 51           .driver_info = AR9280_USB },  /* Atheros */
 52         { USB_DEVICE(0x0846, 0x9018),
 53           .driver_info = AR9280_USB },  /* Netgear WNDA3200 */
 54         { USB_DEVICE(0x083A, 0xA704),
 55           .driver_info = AR9280_USB },  /* SMC Networks */
 56         { USB_DEVICE(0x0411, 0x017f),
 57           .driver_info = AR9280_USB },  /* Sony UWA-BR100 */
 58         { USB_DEVICE(0x0411, 0x0197),
 59           .driver_info = AR9280_USB },  /* Buffalo WLI-UV-AG300P */
 60         { USB_DEVICE(0x04da, 0x3904),
 61           .driver_info = AR9280_USB },
 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         bool txok = true;
142 
143         if (!cmd || !cmd->skb || !cmd->hif_dev)
144                 return;
145 
146         hif_dev = cmd->hif_dev;
147 
148         switch (urb->status) {
149         case 0:
150                 break;
151         case -ENOENT:
152         case -ECONNRESET:
153         case -ENODEV:
154         case -ESHUTDOWN:
155                 txok = false;
156 
157                 /*
158                  * If the URBs are being flushed, no need to complete
159                  * this packet.
160                  */
161                 spin_lock(&hif_dev->tx.tx_lock);
162                 if (hif_dev->tx.flags & HIF_USB_TX_FLUSH) {
163                         spin_unlock(&hif_dev->tx.tx_lock);
164                         dev_kfree_skb_any(cmd->skb);
165                         kfree(cmd);
166                         return;
167                 }
168                 spin_unlock(&hif_dev->tx.tx_lock);
169 
170                 break;
171         default:
172                 txok = false;
173                 break;
174         }
175 
176         skb_pull(cmd->skb, 4);
177         ath9k_htc_txcompletion_cb(cmd->hif_dev->htc_handle,
178                                   cmd->skb, txok);
179         kfree(cmd);
180 }
181 
182 static int hif_usb_send_mgmt(struct hif_device_usb *hif_dev,
183                              struct sk_buff *skb)
184 {
185         struct urb *urb;
186         struct cmd_buf *cmd;
187         int ret = 0;
188         __le16 *hdr;
189 
190         urb = usb_alloc_urb(0, GFP_ATOMIC);
191         if (urb == NULL)
192                 return -ENOMEM;
193 
194         cmd = kzalloc(sizeof(*cmd), GFP_ATOMIC);
195         if (cmd == NULL) {
196                 usb_free_urb(urb);
197                 return -ENOMEM;
198         }
199 
200         cmd->skb = skb;
201         cmd->hif_dev = hif_dev;
202 
203         hdr = (__le16 *) skb_push(skb, 4);
204         *hdr++ = cpu_to_le16(skb->len - 4);
205         *hdr++ = cpu_to_le16(ATH_USB_TX_STREAM_MODE_TAG);
206 
207         usb_fill_bulk_urb(urb, hif_dev->udev,
208                          usb_sndbulkpipe(hif_dev->udev, USB_WLAN_TX_PIPE),
209                          skb->data, skb->len,
210                          hif_usb_mgmt_cb, cmd);
211 
212         usb_anchor_urb(urb, &hif_dev->mgmt_submitted);
213         ret = usb_submit_urb(urb, GFP_ATOMIC);
214         if (ret) {
215                 usb_unanchor_urb(urb);
216                 kfree(cmd);
217         }
218         usb_free_urb(urb);
219 
220         return ret;
221 }
222 
223 static inline void ath9k_skb_queue_purge(struct hif_device_usb *hif_dev,
224                                          struct sk_buff_head *list)
225 {
226         struct sk_buff *skb;
227 
228         while ((skb = __skb_dequeue(list)) != NULL) {
229                 dev_kfree_skb_any(skb);
230         }
231 }
232 
233 static inline void ath9k_skb_queue_complete(struct hif_device_usb *hif_dev,
234                                             struct sk_buff_head *queue,
235                                             bool txok)
236 {
237         struct sk_buff *skb;
238 
239         while ((skb = __skb_dequeue(queue)) != NULL) {
240 #ifdef CONFIG_ATH9K_HTC_DEBUGFS
241                 int ln = skb->len;
242 #endif
243                 ath9k_htc_txcompletion_cb(hif_dev->htc_handle,
244                                           skb, txok);
245                 if (txok) {
246                         TX_STAT_INC(skb_success);
247                         TX_STAT_ADD(skb_success_bytes, ln);
248                 }
249                 else
250                         TX_STAT_INC(skb_failed);
251         }
252 }
253 
254 static void hif_usb_tx_cb(struct urb *urb)
255 {
256         struct tx_buf *tx_buf = (struct tx_buf *) urb->context;
257         struct hif_device_usb *hif_dev;
258         bool txok = true;
259 
260         if (!tx_buf || !tx_buf->hif_dev)
261                 return;
262 
263         hif_dev = tx_buf->hif_dev;
264 
265         switch (urb->status) {
266         case 0:
267                 break;
268         case -ENOENT:
269         case -ECONNRESET:
270         case -ENODEV:
271         case -ESHUTDOWN:
272                 txok = false;
273 
274                 /*
275                  * If the URBs are being flushed, no need to add this
276                  * URB to the free list.
277                  */
278                 spin_lock(&hif_dev->tx.tx_lock);
279                 if (hif_dev->tx.flags & HIF_USB_TX_FLUSH) {
280                         spin_unlock(&hif_dev->tx.tx_lock);
281                         ath9k_skb_queue_purge(hif_dev, &tx_buf->skb_queue);
282                         return;
283                 }
284                 spin_unlock(&hif_dev->tx.tx_lock);
285 
286                 break;
287         default:
288                 txok = false;
289                 break;
290         }
291 
292         ath9k_skb_queue_complete(hif_dev, &tx_buf->skb_queue, txok);
293 
294         /* Re-initialize the SKB queue */
295         tx_buf->len = tx_buf->offset = 0;
296         __skb_queue_head_init(&tx_buf->skb_queue);
297 
298         /* Add this TX buffer to the free list */
299         spin_lock(&hif_dev->tx.tx_lock);
300         list_move_tail(&tx_buf->list, &hif_dev->tx.tx_buf);
301         hif_dev->tx.tx_buf_cnt++;
302         if (!(hif_dev->tx.flags & HIF_USB_TX_STOP))
303                 __hif_usb_tx(hif_dev); /* Check for pending SKBs */
304         TX_STAT_INC(buf_completed);
305         spin_unlock(&hif_dev->tx.tx_lock);
306 }
307 
308 /* TX lock has to be taken */
309 static int __hif_usb_tx(struct hif_device_usb *hif_dev)
310 {
311         struct tx_buf *tx_buf = NULL;
312         struct sk_buff *nskb = NULL;
313         int ret = 0, i;
314         u16 tx_skb_cnt = 0;
315         u8 *buf;
316         __le16 *hdr;
317 
318         if (hif_dev->tx.tx_skb_cnt == 0)
319                 return 0;
320 
321         /* Check if a free TX buffer is available */
322         if (list_empty(&hif_dev->tx.tx_buf))
323                 return 0;
324 
325         tx_buf = list_first_entry(&hif_dev->tx.tx_buf, struct tx_buf, list);
326         list_move_tail(&tx_buf->list, &hif_dev->tx.tx_pending);
327         hif_dev->tx.tx_buf_cnt--;
328 
329         tx_skb_cnt = min_t(u16, hif_dev->tx.tx_skb_cnt, MAX_TX_AGGR_NUM);
330 
331         for (i = 0; i < tx_skb_cnt; i++) {
332                 nskb = __skb_dequeue(&hif_dev->tx.tx_skb_queue);
333 
334                 /* Should never be NULL */
335                 BUG_ON(!nskb);
336 
337                 hif_dev->tx.tx_skb_cnt--;
338 
339                 buf = tx_buf->buf;
340                 buf += tx_buf->offset;
341                 hdr = (__le16 *)buf;
342                 *hdr++ = cpu_to_le16(nskb->len);
343                 *hdr++ = cpu_to_le16(ATH_USB_TX_STREAM_MODE_TAG);
344                 buf += 4;
345                 memcpy(buf, nskb->data, nskb->len);
346                 tx_buf->len = nskb->len + 4;
347 
348                 if (i < (tx_skb_cnt - 1))
349                         tx_buf->offset += (((tx_buf->len - 1) / 4) + 1) * 4;
350 
351                 if (i == (tx_skb_cnt - 1))
352                         tx_buf->len += tx_buf->offset;
353 
354                 __skb_queue_tail(&tx_buf->skb_queue, nskb);
355                 TX_STAT_INC(skb_queued);
356         }
357 
358         usb_fill_bulk_urb(tx_buf->urb, hif_dev->udev,
359                           usb_sndbulkpipe(hif_dev->udev, USB_WLAN_TX_PIPE),
360                           tx_buf->buf, tx_buf->len,
361                           hif_usb_tx_cb, tx_buf);
362 
363         ret = usb_submit_urb(tx_buf->urb, GFP_ATOMIC);
364         if (ret) {
365                 tx_buf->len = tx_buf->offset = 0;
366                 ath9k_skb_queue_complete(hif_dev, &tx_buf->skb_queue, false);
367                 __skb_queue_head_init(&tx_buf->skb_queue);
368                 list_move_tail(&tx_buf->list, &hif_dev->tx.tx_buf);
369                 hif_dev->tx.tx_buf_cnt++;
370         }
371 
372         if (!ret)
373                 TX_STAT_INC(buf_queued);
374 
375         return ret;
376 }
377 
378 static int hif_usb_send_tx(struct hif_device_usb *hif_dev, struct sk_buff *skb)
379 {
380         struct ath9k_htc_tx_ctl *tx_ctl;
381         unsigned long flags;
382         int ret = 0;
383 
384         spin_lock_irqsave(&hif_dev->tx.tx_lock, flags);
385 
386         if (hif_dev->tx.flags & HIF_USB_TX_STOP) {
387                 spin_unlock_irqrestore(&hif_dev->tx.tx_lock, flags);
388                 return -ENODEV;
389         }
390 
391         /* Check if the max queue count has been reached */
392         if (hif_dev->tx.tx_skb_cnt > MAX_TX_BUF_NUM) {
393                 spin_unlock_irqrestore(&hif_dev->tx.tx_lock, flags);
394                 return -ENOMEM;
395         }
396 
397         spin_unlock_irqrestore(&hif_dev->tx.tx_lock, flags);
398 
399         tx_ctl = HTC_SKB_CB(skb);
400 
401         /* Mgmt/Beacon frames don't use the TX buffer pool */
402         if ((tx_ctl->type == ATH9K_HTC_MGMT) ||
403             (tx_ctl->type == ATH9K_HTC_BEACON)) {
404                 ret = hif_usb_send_mgmt(hif_dev, skb);
405         }
406 
407         spin_lock_irqsave(&hif_dev->tx.tx_lock, flags);
408 
409         if ((tx_ctl->type == ATH9K_HTC_NORMAL) ||
410             (tx_ctl->type == ATH9K_HTC_AMPDU)) {
411                 __skb_queue_tail(&hif_dev->tx.tx_skb_queue, skb);
412                 hif_dev->tx.tx_skb_cnt++;
413         }
414 
415         /* Check if AMPDUs have to be sent immediately */
416         if ((hif_dev->tx.tx_buf_cnt == MAX_TX_URB_NUM) &&
417             (hif_dev->tx.tx_skb_cnt < 2)) {
418                 __hif_usb_tx(hif_dev);
419         }
420 
421         spin_unlock_irqrestore(&hif_dev->tx.tx_lock, flags);
422 
423         return ret;
424 }
425 
426 static void hif_usb_start(void *hif_handle)
427 {
428         struct hif_device_usb *hif_dev = (struct hif_device_usb *)hif_handle;
429         unsigned long flags;
430 
431         hif_dev->flags |= HIF_USB_START;
432 
433         spin_lock_irqsave(&hif_dev->tx.tx_lock, flags);
434         hif_dev->tx.flags &= ~HIF_USB_TX_STOP;
435         spin_unlock_irqrestore(&hif_dev->tx.tx_lock, flags);
436 }
437 
438 static void hif_usb_stop(void *hif_handle)
439 {
440         struct hif_device_usb *hif_dev = (struct hif_device_usb *)hif_handle;
441         struct tx_buf *tx_buf = NULL, *tx_buf_tmp = NULL;
442         unsigned long flags;
443 
444         spin_lock_irqsave(&hif_dev->tx.tx_lock, flags);
445         ath9k_skb_queue_complete(hif_dev, &hif_dev->tx.tx_skb_queue, false);
446         hif_dev->tx.tx_skb_cnt = 0;
447         hif_dev->tx.flags |= HIF_USB_TX_STOP;
448         spin_unlock_irqrestore(&hif_dev->tx.tx_lock, flags);
449 
450         /* The pending URBs have to be canceled. */
451         list_for_each_entry_safe(tx_buf, tx_buf_tmp,
452                                  &hif_dev->tx.tx_pending, list) {
453                 usb_kill_urb(tx_buf->urb);
454         }
455 
456         usb_kill_anchored_urbs(&hif_dev->mgmt_submitted);
457 }
458 
459 static int hif_usb_send(void *hif_handle, u8 pipe_id, struct sk_buff *skb)
460 {
461         struct hif_device_usb *hif_dev = (struct hif_device_usb *)hif_handle;
462         int ret = 0;
463 
464         switch (pipe_id) {
465         case USB_WLAN_TX_PIPE:
466                 ret = hif_usb_send_tx(hif_dev, skb);
467                 break;
468         case USB_REG_OUT_PIPE:
469                 ret = hif_usb_send_regout(hif_dev, skb);
470                 break;
471         default:
472                 dev_err(&hif_dev->udev->dev,
473                         "ath9k_htc: Invalid TX pipe: %d\n", pipe_id);
474                 ret = -EINVAL;
475                 break;
476         }
477 
478         return ret;
479 }
480 
481 static inline bool check_index(struct sk_buff *skb, u8 idx)
482 {
483         struct ath9k_htc_tx_ctl *tx_ctl;
484 
485         tx_ctl = HTC_SKB_CB(skb);
486 
487         if ((tx_ctl->type == ATH9K_HTC_AMPDU) &&
488             (tx_ctl->sta_idx == idx))
489                 return true;
490 
491         return false;
492 }
493 
494 static void hif_usb_sta_drain(void *hif_handle, u8 idx)
495 {
496         struct hif_device_usb *hif_dev = (struct hif_device_usb *)hif_handle;
497         struct sk_buff *skb, *tmp;
498         unsigned long flags;
499 
500         spin_lock_irqsave(&hif_dev->tx.tx_lock, flags);
501 
502         skb_queue_walk_safe(&hif_dev->tx.tx_skb_queue, skb, tmp) {
503                 if (check_index(skb, idx)) {
504                         __skb_unlink(skb, &hif_dev->tx.tx_skb_queue);
505                         ath9k_htc_txcompletion_cb(hif_dev->htc_handle,
506                                                   skb, false);
507                         hif_dev->tx.tx_skb_cnt--;
508                         TX_STAT_INC(skb_failed);
509                 }
510         }
511 
512         spin_unlock_irqrestore(&hif_dev->tx.tx_lock, flags);
513 }
514 
515 static struct ath9k_htc_hif hif_usb = {
516         .transport = ATH9K_HIF_USB,
517         .name = "ath9k_hif_usb",
518 
519         .control_ul_pipe = USB_REG_OUT_PIPE,
520         .control_dl_pipe = USB_REG_IN_PIPE,
521 
522         .start = hif_usb_start,
523         .stop = hif_usb_stop,
524         .sta_drain = hif_usb_sta_drain,
525         .send = hif_usb_send,
526 };
527 
528 static void ath9k_hif_usb_rx_stream(struct hif_device_usb *hif_dev,
529                                     struct sk_buff *skb)
530 {
531         struct sk_buff *nskb, *skb_pool[MAX_PKT_NUM_IN_TRANSFER];
532         int index = 0, i = 0, len = skb->len;
533         int rx_remain_len, rx_pkt_len;
534         u16 pool_index = 0;
535         u8 *ptr;
536 
537         spin_lock(&hif_dev->rx_lock);
538 
539         rx_remain_len = hif_dev->rx_remain_len;
540         rx_pkt_len = hif_dev->rx_transfer_len;
541 
542         if (rx_remain_len != 0) {
543                 struct sk_buff *remain_skb = hif_dev->remain_skb;
544 
545                 if (remain_skb) {
546                         ptr = (u8 *) remain_skb->data;
547 
548                         index = rx_remain_len;
549                         rx_remain_len -= hif_dev->rx_pad_len;
550                         ptr += rx_pkt_len;
551 
552                         memcpy(ptr, skb->data, rx_remain_len);
553 
554                         rx_pkt_len += rx_remain_len;
555                         hif_dev->rx_remain_len = 0;
556                         skb_put(remain_skb, rx_pkt_len);
557 
558                         skb_pool[pool_index++] = remain_skb;
559 
560                 } else {
561                         index = rx_remain_len;
562                 }
563         }
564 
565         spin_unlock(&hif_dev->rx_lock);
566 
567         while (index < len) {
568                 u16 pkt_len;
569                 u16 pkt_tag;
570                 u16 pad_len;
571                 int chk_idx;
572 
573                 ptr = (u8 *) skb->data;
574 
575                 pkt_len = get_unaligned_le16(ptr + index);
576                 pkt_tag = get_unaligned_le16(ptr + index + 2);
577 
578                 if (pkt_tag != ATH_USB_RX_STREAM_MODE_TAG) {
579                         RX_STAT_INC(skb_dropped);
580                         return;
581                 }
582 
583                 pad_len = 4 - (pkt_len & 0x3);
584                 if (pad_len == 4)
585                         pad_len = 0;
586 
587                 chk_idx = index;
588                 index = index + 4 + pkt_len + pad_len;
589 
590                 if (index > MAX_RX_BUF_SIZE) {
591                         spin_lock(&hif_dev->rx_lock);
592                         hif_dev->rx_remain_len = index - MAX_RX_BUF_SIZE;
593                         hif_dev->rx_transfer_len =
594                                 MAX_RX_BUF_SIZE - chk_idx - 4;
595                         hif_dev->rx_pad_len = pad_len;
596 
597                         nskb = __dev_alloc_skb(pkt_len + 32, GFP_ATOMIC);
598                         if (!nskb) {
599                                 dev_err(&hif_dev->udev->dev,
600                                         "ath9k_htc: RX memory allocation error\n");
601                                 spin_unlock(&hif_dev->rx_lock);
602                                 goto err;
603                         }
604                         skb_reserve(nskb, 32);
605                         RX_STAT_INC(skb_allocated);
606 
607                         memcpy(nskb->data, &(skb->data[chk_idx+4]),
608                                hif_dev->rx_transfer_len);
609 
610                         /* Record the buffer pointer */
611                         hif_dev->remain_skb = nskb;
612                         spin_unlock(&hif_dev->rx_lock);
613                 } else {
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                                 goto err;
619                         }
620                         skb_reserve(nskb, 32);
621                         RX_STAT_INC(skb_allocated);
622 
623                         memcpy(nskb->data, &(skb->data[chk_idx+4]), pkt_len);
624                         skb_put(nskb, pkt_len);
625                         skb_pool[pool_index++] = nskb;
626                 }
627         }
628 
629 err:
630         for (i = 0; i < pool_index; i++) {
631                 RX_STAT_ADD(skb_completed_bytes, skb_pool[i]->len);
632                 ath9k_htc_rx_msg(hif_dev->htc_handle, skb_pool[i],
633                                  skb_pool[i]->len, USB_WLAN_RX_PIPE);
634                 RX_STAT_INC(skb_completed);
635         }
636 }
637 
638 static void ath9k_hif_usb_rx_cb(struct urb *urb)
639 {
640         struct sk_buff *skb = (struct sk_buff *) urb->context;
641         struct hif_device_usb *hif_dev =
642                 usb_get_intfdata(usb_ifnum_to_if(urb->dev, 0));
643         int ret;
644 
645         if (!skb)
646                 return;
647 
648         if (!hif_dev)
649                 goto free;
650 
651         switch (urb->status) {
652         case 0:
653                 break;
654         case -ENOENT:
655         case -ECONNRESET:
656         case -ENODEV:
657         case -ESHUTDOWN:
658                 goto free;
659         default:
660                 goto resubmit;
661         }
662 
663         if (likely(urb->actual_length != 0)) {
664                 skb_put(skb, urb->actual_length);
665                 ath9k_hif_usb_rx_stream(hif_dev, skb);
666         }
667 
668 resubmit:
669         skb_reset_tail_pointer(skb);
670         skb_trim(skb, 0);
671 
672         usb_anchor_urb(urb, &hif_dev->rx_submitted);
673         ret = usb_submit_urb(urb, GFP_ATOMIC);
674         if (ret) {
675                 usb_unanchor_urb(urb);
676                 goto free;
677         }
678 
679         return;
680 free:
681         kfree_skb(skb);
682 }
683 
684 static void ath9k_hif_usb_reg_in_cb(struct urb *urb)
685 {
686         struct sk_buff *skb = (struct sk_buff *) urb->context;
687         struct sk_buff *nskb;
688         struct hif_device_usb *hif_dev =
689                 usb_get_intfdata(usb_ifnum_to_if(urb->dev, 0));
690         int ret;
691 
692         if (!skb)
693                 return;
694 
695         if (!hif_dev)
696                 goto free;
697 
698         switch (urb->status) {
699         case 0:
700                 break;
701         case -ENOENT:
702         case -ECONNRESET:
703         case -ENODEV:
704         case -ESHUTDOWN:
705                 goto free;
706         default:
707                 skb_reset_tail_pointer(skb);
708                 skb_trim(skb, 0);
709 
710                 goto resubmit;
711         }
712 
713         if (likely(urb->actual_length != 0)) {
714                 skb_put(skb, urb->actual_length);
715 
716                 /* Process the command first */
717                 ath9k_htc_rx_msg(hif_dev->htc_handle, skb,
718                                  skb->len, USB_REG_IN_PIPE);
719 
720 
721                 nskb = alloc_skb(MAX_REG_IN_BUF_SIZE, GFP_ATOMIC);
722                 if (!nskb) {
723                         dev_err(&hif_dev->udev->dev,
724                                 "ath9k_htc: REG_IN memory allocation failure\n");
725                         urb->context = NULL;
726                         return;
727                 }
728 
729                 usb_fill_int_urb(urb, hif_dev->udev,
730                                  usb_rcvintpipe(hif_dev->udev,
731                                                  USB_REG_IN_PIPE),
732                                  nskb->data, MAX_REG_IN_BUF_SIZE,
733                                  ath9k_hif_usb_reg_in_cb, nskb, 1);
734         }
735 
736 resubmit:
737         usb_anchor_urb(urb, &hif_dev->reg_in_submitted);
738         ret = usb_submit_urb(urb, GFP_ATOMIC);
739         if (ret) {
740                 usb_unanchor_urb(urb);
741                 goto free;
742         }
743 
744         return;
745 free:
746         kfree_skb(skb);
747         urb->context = NULL;
748 }
749 
750 static void ath9k_hif_usb_dealloc_tx_urbs(struct hif_device_usb *hif_dev)
751 {
752         struct tx_buf *tx_buf = NULL, *tx_buf_tmp = NULL;
753         unsigned long flags;
754 
755         list_for_each_entry_safe(tx_buf, tx_buf_tmp,
756                                  &hif_dev->tx.tx_buf, list) {
757                 usb_kill_urb(tx_buf->urb);
758                 list_del(&tx_buf->list);
759                 usb_free_urb(tx_buf->urb);
760                 kfree(tx_buf->buf);
761                 kfree(tx_buf);
762         }
763 
764         spin_lock_irqsave(&hif_dev->tx.tx_lock, flags);
765         hif_dev->tx.flags |= HIF_USB_TX_FLUSH;
766         spin_unlock_irqrestore(&hif_dev->tx.tx_lock, flags);
767 
768         list_for_each_entry_safe(tx_buf, tx_buf_tmp,
769                                  &hif_dev->tx.tx_pending, list) {
770                 usb_kill_urb(tx_buf->urb);
771                 list_del(&tx_buf->list);
772                 usb_free_urb(tx_buf->urb);
773                 kfree(tx_buf->buf);
774                 kfree(tx_buf);
775         }
776 
777         usb_kill_anchored_urbs(&hif_dev->mgmt_submitted);
778 }
779 
780 static int ath9k_hif_usb_alloc_tx_urbs(struct hif_device_usb *hif_dev)
781 {
782         struct tx_buf *tx_buf;
783         int i;
784 
785         INIT_LIST_HEAD(&hif_dev->tx.tx_buf);
786         INIT_LIST_HEAD(&hif_dev->tx.tx_pending);
787         spin_lock_init(&hif_dev->tx.tx_lock);
788         __skb_queue_head_init(&hif_dev->tx.tx_skb_queue);
789         init_usb_anchor(&hif_dev->mgmt_submitted);
790 
791         for (i = 0; i < MAX_TX_URB_NUM; i++) {
792                 tx_buf = kzalloc(sizeof(struct tx_buf), GFP_KERNEL);
793                 if (!tx_buf)
794                         goto err;
795 
796                 tx_buf->buf = kzalloc(MAX_TX_BUF_SIZE, GFP_KERNEL);
797                 if (!tx_buf->buf)
798                         goto err;
799 
800                 tx_buf->urb = usb_alloc_urb(0, GFP_KERNEL);
801                 if (!tx_buf->urb)
802                         goto err;
803 
804                 tx_buf->hif_dev = hif_dev;
805                 __skb_queue_head_init(&tx_buf->skb_queue);
806 
807                 list_add_tail(&tx_buf->list, &hif_dev->tx.tx_buf);
808         }
809 
810         hif_dev->tx.tx_buf_cnt = MAX_TX_URB_NUM;
811 
812         return 0;
813 err:
814         if (tx_buf) {
815                 kfree(tx_buf->buf);
816                 kfree(tx_buf);
817         }
818         ath9k_hif_usb_dealloc_tx_urbs(hif_dev);
819         return -ENOMEM;
820 }
821 
822 static void ath9k_hif_usb_dealloc_rx_urbs(struct hif_device_usb *hif_dev)
823 {
824         usb_kill_anchored_urbs(&hif_dev->rx_submitted);
825 }
826 
827 static int ath9k_hif_usb_alloc_rx_urbs(struct hif_device_usb *hif_dev)
828 {
829         struct urb *urb = NULL;
830         struct sk_buff *skb = NULL;
831         int i, ret;
832 
833         init_usb_anchor(&hif_dev->rx_submitted);
834         spin_lock_init(&hif_dev->rx_lock);
835 
836         for (i = 0; i < MAX_RX_URB_NUM; i++) {
837 
838                 /* Allocate URB */
839                 urb = usb_alloc_urb(0, GFP_KERNEL);
840                 if (urb == NULL) {
841                         ret = -ENOMEM;
842                         goto err_urb;
843                 }
844 
845                 /* Allocate buffer */
846                 skb = alloc_skb(MAX_RX_BUF_SIZE, GFP_KERNEL);
847                 if (!skb) {
848                         ret = -ENOMEM;
849                         goto err_skb;
850                 }
851 
852                 usb_fill_bulk_urb(urb, hif_dev->udev,
853                                   usb_rcvbulkpipe(hif_dev->udev,
854                                                   USB_WLAN_RX_PIPE),
855                                   skb->data, MAX_RX_BUF_SIZE,
856                                   ath9k_hif_usb_rx_cb, skb);
857 
858                 /* Anchor URB */
859                 usb_anchor_urb(urb, &hif_dev->rx_submitted);
860 
861                 /* Submit URB */
862                 ret = usb_submit_urb(urb, GFP_KERNEL);
863                 if (ret) {
864                         usb_unanchor_urb(urb);
865                         goto err_submit;
866                 }
867 
868                 /*
869                  * Drop reference count.
870                  * This ensures that the URB is freed when killing them.
871                  */
872                 usb_free_urb(urb);
873         }
874 
875         return 0;
876 
877 err_submit:
878         kfree_skb(skb);
879 err_skb:
880         usb_free_urb(urb);
881 err_urb:
882         ath9k_hif_usb_dealloc_rx_urbs(hif_dev);
883         return ret;
884 }
885 
886 static void ath9k_hif_usb_dealloc_reg_in_urbs(struct hif_device_usb *hif_dev)
887 {
888         usb_kill_anchored_urbs(&hif_dev->reg_in_submitted);
889 }
890 
891 static int ath9k_hif_usb_alloc_reg_in_urbs(struct hif_device_usb *hif_dev)
892 {
893         struct urb *urb = NULL;
894         struct sk_buff *skb = NULL;
895         int i, ret;
896 
897         init_usb_anchor(&hif_dev->reg_in_submitted);
898 
899         for (i = 0; i < MAX_REG_IN_URB_NUM; i++) {
900 
901                 /* Allocate URB */
902                 urb = usb_alloc_urb(0, GFP_KERNEL);
903                 if (urb == NULL) {
904                         ret = -ENOMEM;
905                         goto err_urb;
906                 }
907 
908                 /* Allocate buffer */
909                 skb = alloc_skb(MAX_REG_IN_BUF_SIZE, GFP_KERNEL);
910                 if (!skb) {
911                         ret = -ENOMEM;
912                         goto err_skb;
913                 }
914 
915                 usb_fill_int_urb(urb, hif_dev->udev,
916                                   usb_rcvintpipe(hif_dev->udev,
917                                                   USB_REG_IN_PIPE),
918                                   skb->data, MAX_REG_IN_BUF_SIZE,
919                                   ath9k_hif_usb_reg_in_cb, skb, 1);
920 
921                 /* Anchor URB */
922                 usb_anchor_urb(urb, &hif_dev->reg_in_submitted);
923 
924                 /* Submit URB */
925                 ret = usb_submit_urb(urb, GFP_KERNEL);
926                 if (ret) {
927                         usb_unanchor_urb(urb);
928                         goto err_submit;
929                 }
930 
931                 /*
932                  * Drop reference count.
933                  * This ensures that the URB is freed when killing them.
934                  */
935                 usb_free_urb(urb);
936         }
937 
938         return 0;
939 
940 err_submit:
941         kfree_skb(skb);
942 err_skb:
943         usb_free_urb(urb);
944 err_urb:
945         ath9k_hif_usb_dealloc_reg_in_urbs(hif_dev);
946         return ret;
947 }
948 
949 static int ath9k_hif_usb_alloc_urbs(struct hif_device_usb *hif_dev)
950 {
951         /* Register Write */
952         init_usb_anchor(&hif_dev->regout_submitted);
953 
954         /* TX */
955         if (ath9k_hif_usb_alloc_tx_urbs(hif_dev) < 0)
956                 goto err;
957 
958         /* RX */
959         if (ath9k_hif_usb_alloc_rx_urbs(hif_dev) < 0)
960                 goto err_rx;
961 
962         /* Register Read */
963         if (ath9k_hif_usb_alloc_reg_in_urbs(hif_dev) < 0)
964                 goto err_reg;
965 
966         return 0;
967 err_reg:
968         ath9k_hif_usb_dealloc_rx_urbs(hif_dev);
969 err_rx:
970         ath9k_hif_usb_dealloc_tx_urbs(hif_dev);
971 err:
972         return -ENOMEM;
973 }
974 
975 static void ath9k_hif_usb_dealloc_urbs(struct hif_device_usb *hif_dev)
976 {
977         usb_kill_anchored_urbs(&hif_dev->regout_submitted);
978         ath9k_hif_usb_dealloc_reg_in_urbs(hif_dev);
979         ath9k_hif_usb_dealloc_tx_urbs(hif_dev);
980         ath9k_hif_usb_dealloc_rx_urbs(hif_dev);
981 }
982 
983 static int ath9k_hif_usb_download_fw(struct hif_device_usb *hif_dev)
984 {
985         int transfer, err;
986         const void *data = hif_dev->fw_data;
987         size_t len = hif_dev->fw_size;
988         u32 addr = AR9271_FIRMWARE;
989         u8 *buf = kzalloc(4096, GFP_KERNEL);
990         u32 firm_offset;
991 
992         if (!buf)
993                 return -ENOMEM;
994 
995         while (len) {
996                 transfer = min_t(size_t, len, 4096);
997                 memcpy(buf, data, transfer);
998 
999                 err = usb_control_msg(hif_dev->udev,
1000                                       usb_sndctrlpipe(hif_dev->udev, 0),
1001                                       FIRMWARE_DOWNLOAD, 0x40 | USB_DIR_OUT,
1002                                       addr >> 8, 0, buf, transfer, HZ);
1003                 if (err < 0) {
1004                         kfree(buf);
1005                         return err;
1006                 }
1007 
1008                 len -= transfer;
1009                 data += transfer;
1010                 addr += transfer;
1011         }
1012         kfree(buf);
1013 
1014         if (IS_AR7010_DEVICE(hif_dev->usb_device_id->driver_info))
1015                 firm_offset = AR7010_FIRMWARE_TEXT;
1016         else
1017                 firm_offset = AR9271_FIRMWARE_TEXT;
1018 
1019         /*
1020          * Issue FW download complete command to firmware.
1021          */
1022         err = usb_control_msg(hif_dev->udev, usb_sndctrlpipe(hif_dev->udev, 0),
1023                               FIRMWARE_DOWNLOAD_COMP,
1024                               0x40 | USB_DIR_OUT,
1025                               firm_offset >> 8, 0, NULL, 0, HZ);
1026         if (err)
1027                 return -EIO;
1028 
1029         dev_info(&hif_dev->udev->dev, "ath9k_htc: Transferred FW: %s, size: %ld\n",
1030                  hif_dev->fw_name, (unsigned long) hif_dev->fw_size);
1031 
1032         return 0;
1033 }
1034 
1035 static int ath9k_hif_usb_dev_init(struct hif_device_usb *hif_dev)
1036 {
1037         int ret;
1038 
1039         ret = ath9k_hif_usb_download_fw(hif_dev);
1040         if (ret) {
1041                 dev_err(&hif_dev->udev->dev,
1042                         "ath9k_htc: Firmware - %s download failed\n",
1043                         hif_dev->fw_name);
1044                 return ret;
1045         }
1046 
1047         /* Alloc URBs */
1048         ret = ath9k_hif_usb_alloc_urbs(hif_dev);
1049         if (ret) {
1050                 dev_err(&hif_dev->udev->dev,
1051                         "ath9k_htc: Unable to allocate URBs\n");
1052                 return ret;
1053         }
1054 
1055         return 0;
1056 }
1057 
1058 static void ath9k_hif_usb_dev_deinit(struct hif_device_usb *hif_dev)
1059 {
1060         ath9k_hif_usb_dealloc_urbs(hif_dev);
1061 }
1062 
1063 /*
1064  * If initialization fails or the FW cannot be retrieved,
1065  * detach the device.
1066  */
1067 static void ath9k_hif_usb_firmware_fail(struct hif_device_usb *hif_dev)
1068 {
1069         struct device *dev = &hif_dev->udev->dev;
1070         struct device *parent = dev->parent;
1071 
1072         complete_all(&hif_dev->fw_done);
1073 
1074         if (parent)
1075                 device_lock(parent);
1076 
1077         device_release_driver(dev);
1078 
1079         if (parent)
1080                 device_unlock(parent);
1081 }
1082 
1083 static void ath9k_hif_usb_firmware_cb(const struct firmware *fw, void *context)
1084 {
1085         struct hif_device_usb *hif_dev = context;
1086         int ret;
1087 
1088         if (!fw) {
1089                 dev_err(&hif_dev->udev->dev,
1090                         "ath9k_htc: Failed to get firmware %s\n",
1091                         hif_dev->fw_name);
1092                 goto err_fw;
1093         }
1094 
1095         hif_dev->htc_handle = ath9k_htc_hw_alloc(hif_dev, &hif_usb,
1096                                                  &hif_dev->udev->dev);
1097         if (hif_dev->htc_handle == NULL)
1098                 goto err_dev_alloc;
1099 
1100         hif_dev->fw_data = fw->data;
1101         hif_dev->fw_size = fw->size;
1102 
1103         /* Proceed with initialization */
1104 
1105         ret = ath9k_hif_usb_dev_init(hif_dev);
1106         if (ret)
1107                 goto err_dev_init;
1108 
1109         ret = ath9k_htc_hw_init(hif_dev->htc_handle,
1110                                 &hif_dev->interface->dev,
1111                                 hif_dev->usb_device_id->idProduct,
1112                                 hif_dev->udev->product,
1113                                 hif_dev->usb_device_id->driver_info);
1114         if (ret) {
1115                 ret = -EINVAL;
1116                 goto err_htc_hw_init;
1117         }
1118 
1119         release_firmware(fw);
1120         hif_dev->flags |= HIF_USB_READY;
1121         complete_all(&hif_dev->fw_done);
1122 
1123         return;
1124 
1125 err_htc_hw_init:
1126         ath9k_hif_usb_dev_deinit(hif_dev);
1127 err_dev_init:
1128         ath9k_htc_hw_free(hif_dev->htc_handle);
1129 err_dev_alloc:
1130         release_firmware(fw);
1131 err_fw:
1132         ath9k_hif_usb_firmware_fail(hif_dev);
1133 }
1134 
1135 /*
1136  * An exact copy of the function from zd1211rw.
1137  */
1138 static int send_eject_command(struct usb_interface *interface)
1139 {
1140         struct usb_device *udev = interface_to_usbdev(interface);
1141         struct usb_host_interface *iface_desc = &interface->altsetting[0];
1142         struct usb_endpoint_descriptor *endpoint;
1143         unsigned char *cmd;
1144         u8 bulk_out_ep;
1145         int r;
1146 
1147         /* Find bulk out endpoint */
1148         for (r = 1; r >= 0; r--) {
1149                 endpoint = &iface_desc->endpoint[r].desc;
1150                 if (usb_endpoint_dir_out(endpoint) &&
1151                     usb_endpoint_xfer_bulk(endpoint)) {
1152                         bulk_out_ep = endpoint->bEndpointAddress;
1153                         break;
1154                 }
1155         }
1156         if (r == -1) {
1157                 dev_err(&udev->dev,
1158                         "ath9k_htc: Could not find bulk out endpoint\n");
1159                 return -ENODEV;
1160         }
1161 
1162         cmd = kzalloc(31, GFP_KERNEL);
1163         if (cmd == NULL)
1164                 return -ENODEV;
1165 
1166         /* USB bulk command block */
1167         cmd[0] = 0x55;  /* bulk command signature */
1168         cmd[1] = 0x53;  /* bulk command signature */
1169         cmd[2] = 0x42;  /* bulk command signature */
1170         cmd[3] = 0x43;  /* bulk command signature */
1171         cmd[14] = 6;    /* command length */
1172 
1173         cmd[15] = 0x1b; /* SCSI command: START STOP UNIT */
1174         cmd[19] = 0x2;  /* eject disc */
1175 
1176         dev_info(&udev->dev, "Ejecting storage device...\n");
1177         r = usb_bulk_msg(udev, usb_sndbulkpipe(udev, bulk_out_ep),
1178                 cmd, 31, NULL, 2000);
1179         kfree(cmd);
1180         if (r)
1181                 return r;
1182 
1183         /* At this point, the device disconnects and reconnects with the real
1184          * ID numbers. */
1185 
1186         usb_set_intfdata(interface, NULL);
1187         return 0;
1188 }
1189 
1190 static int ath9k_hif_usb_probe(struct usb_interface *interface,
1191                                const struct usb_device_id *id)
1192 {
1193         struct usb_device *udev = interface_to_usbdev(interface);
1194         struct hif_device_usb *hif_dev;
1195         int ret = 0;
1196 
1197         if (id->driver_info == STORAGE_DEVICE)
1198                 return send_eject_command(interface);
1199 
1200         hif_dev = kzalloc(sizeof(struct hif_device_usb), GFP_KERNEL);
1201         if (!hif_dev) {
1202                 ret = -ENOMEM;
1203                 goto err_alloc;
1204         }
1205 
1206         usb_get_dev(udev);
1207 
1208         hif_dev->udev = udev;
1209         hif_dev->interface = interface;
1210         hif_dev->usb_device_id = id;
1211 #ifdef CONFIG_PM
1212         udev->reset_resume = 1;
1213 #endif
1214         usb_set_intfdata(interface, hif_dev);
1215 
1216         init_completion(&hif_dev->fw_done);
1217 
1218         /* Find out which firmware to load */
1219 
1220         if (IS_AR7010_DEVICE(id->driver_info))
1221                 hif_dev->fw_name = FIRMWARE_AR7010_1_1;
1222         else
1223                 hif_dev->fw_name = FIRMWARE_AR9271;
1224 
1225         ret = request_firmware_nowait(THIS_MODULE, true, hif_dev->fw_name,
1226                                       &hif_dev->udev->dev, GFP_KERNEL,
1227                                       hif_dev, ath9k_hif_usb_firmware_cb);
1228         if (ret) {
1229                 dev_err(&hif_dev->udev->dev,
1230                         "ath9k_htc: Async request for firmware %s failed\n",
1231                         hif_dev->fw_name);
1232                 goto err_fw_req;
1233         }
1234 
1235         dev_info(&hif_dev->udev->dev, "ath9k_htc: Firmware %s requested\n",
1236                  hif_dev->fw_name);
1237 
1238         return 0;
1239 
1240 err_fw_req:
1241         usb_set_intfdata(interface, NULL);
1242         kfree(hif_dev);
1243         usb_put_dev(udev);
1244 err_alloc:
1245         return ret;
1246 }
1247 
1248 static void ath9k_hif_usb_reboot(struct usb_device *udev)
1249 {
1250         u32 reboot_cmd = 0xffffffff;
1251         void *buf;
1252         int ret;
1253 
1254         buf = kmemdup(&reboot_cmd, 4, GFP_KERNEL);
1255         if (!buf)
1256                 return;
1257 
1258         ret = usb_interrupt_msg(udev, usb_sndintpipe(udev, USB_REG_OUT_PIPE),
1259                            buf, 4, NULL, HZ);
1260         if (ret)
1261                 dev_err(&udev->dev, "ath9k_htc: USB reboot failed\n");
1262 
1263         kfree(buf);
1264 }
1265 
1266 static void ath9k_hif_usb_disconnect(struct usb_interface *interface)
1267 {
1268         struct usb_device *udev = interface_to_usbdev(interface);
1269         struct hif_device_usb *hif_dev = usb_get_intfdata(interface);
1270         bool unplugged = (udev->state == USB_STATE_NOTATTACHED) ? true : false;
1271 
1272         if (!hif_dev)
1273                 return;
1274 
1275         wait_for_completion(&hif_dev->fw_done);
1276 
1277         if (hif_dev->flags & HIF_USB_READY) {
1278                 ath9k_htc_hw_deinit(hif_dev->htc_handle, unplugged);
1279                 ath9k_htc_hw_free(hif_dev->htc_handle);
1280                 ath9k_hif_usb_dev_deinit(hif_dev);
1281         }
1282 
1283         usb_set_intfdata(interface, NULL);
1284 
1285         /* If firmware was loaded we should drop it
1286          * go back to first stage bootloader. */
1287         if (!unplugged && (hif_dev->flags & HIF_USB_READY))
1288                 ath9k_hif_usb_reboot(udev);
1289 
1290         kfree(hif_dev);
1291         dev_info(&udev->dev, "ath9k_htc: USB layer deinitialized\n");
1292         usb_put_dev(udev);
1293 }
1294 
1295 #ifdef CONFIG_PM
1296 static int ath9k_hif_usb_suspend(struct usb_interface *interface,
1297                                  pm_message_t message)
1298 {
1299         struct hif_device_usb *hif_dev = usb_get_intfdata(interface);
1300 
1301         /*
1302          * The device has to be set to FULLSLEEP mode in case no
1303          * interface is up.
1304          */
1305         if (!(hif_dev->flags & HIF_USB_START))
1306                 ath9k_htc_suspend(hif_dev->htc_handle);
1307 
1308         wait_for_completion(&hif_dev->fw_done);
1309 
1310         if (hif_dev->flags & HIF_USB_READY)
1311                 ath9k_hif_usb_dealloc_urbs(hif_dev);
1312 
1313         return 0;
1314 }
1315 
1316 static int ath9k_hif_usb_resume(struct usb_interface *interface)
1317 {
1318         struct hif_device_usb *hif_dev = usb_get_intfdata(interface);
1319         struct htc_target *htc_handle = hif_dev->htc_handle;
1320         int ret;
1321         const struct firmware *fw;
1322 
1323         ret = ath9k_hif_usb_alloc_urbs(hif_dev);
1324         if (ret)
1325                 return ret;
1326 
1327         if (hif_dev->flags & HIF_USB_READY) {
1328                 /* request cached firmware during suspend/resume cycle */
1329                 ret = request_firmware(&fw, hif_dev->fw_name,
1330                                        &hif_dev->udev->dev);
1331                 if (ret)
1332                         goto fail_resume;
1333 
1334                 hif_dev->fw_data = fw->data;
1335                 hif_dev->fw_size = fw->size;
1336                 ret = ath9k_hif_usb_download_fw(hif_dev);
1337                 release_firmware(fw);
1338                 if (ret)
1339                         goto fail_resume;
1340         } else {
1341                 ath9k_hif_usb_dealloc_urbs(hif_dev);
1342                 return -EIO;
1343         }
1344 
1345         mdelay(100);
1346 
1347         ret = ath9k_htc_resume(htc_handle);
1348 
1349         if (ret)
1350                 goto fail_resume;
1351 
1352         return 0;
1353 
1354 fail_resume:
1355         ath9k_hif_usb_dealloc_urbs(hif_dev);
1356 
1357         return ret;
1358 }
1359 #endif
1360 
1361 static struct usb_driver ath9k_hif_usb_driver = {
1362         .name = KBUILD_MODNAME,
1363         .probe = ath9k_hif_usb_probe,
1364         .disconnect = ath9k_hif_usb_disconnect,
1365 #ifdef CONFIG_PM
1366         .suspend = ath9k_hif_usb_suspend,
1367         .resume = ath9k_hif_usb_resume,
1368         .reset_resume = ath9k_hif_usb_resume,
1369 #endif
1370         .id_table = ath9k_hif_usb_ids,
1371         .soft_unbind = 1,
1372         .disable_hub_initiated_lpm = 1,
1373 };
1374 
1375 int ath9k_hif_usb_init(void)
1376 {
1377         return usb_register(&ath9k_hif_usb_driver);
1378 }
1379 
1380 void ath9k_hif_usb_exit(void)
1381 {
1382         usb_deregister(&ath9k_hif_usb_driver);
1383 }
1384 

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