Version:  2.0.40 2.2.26 2.4.37 3.11 3.12 3.13 3.14 3.15 3.16 3.17 3.18 3.19 4.0 4.1 4.2 4.3 4.4 4.5 4.6 4.7 4.8

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 MODULE_FIRMWARE(HTC_7010_MODULE_FW);
 21 MODULE_FIRMWARE(HTC_9271_MODULE_FW);
 22 
 23 static struct usb_device_id ath9k_hif_usb_ids[] = {
 24         { USB_DEVICE(0x0cf3, 0x9271) }, /* Atheros */
 25         { USB_DEVICE(0x0cf3, 0x1006) }, /* Atheros */
 26         { USB_DEVICE(0x0846, 0x9030) }, /* Netgear N150 */
 27         { USB_DEVICE(0x07D1, 0x3A10) }, /* Dlink Wireless 150 */
 28         { USB_DEVICE(0x13D3, 0x3327) }, /* Azurewave */
 29         { USB_DEVICE(0x13D3, 0x3328) }, /* Azurewave */
 30         { USB_DEVICE(0x13D3, 0x3346) }, /* IMC Networks */
 31         { USB_DEVICE(0x13D3, 0x3348) }, /* Azurewave */
 32         { USB_DEVICE(0x13D3, 0x3349) }, /* Azurewave */
 33         { USB_DEVICE(0x13D3, 0x3350) }, /* Azurewave */
 34         { USB_DEVICE(0x04CA, 0x4605) }, /* Liteon */
 35         { USB_DEVICE(0x040D, 0x3801) }, /* VIA */
 36         { USB_DEVICE(0x0cf3, 0xb003) }, /* Ubiquiti WifiStation Ext */
 37         { USB_DEVICE(0x0cf3, 0xb002) }, /* Ubiquiti WifiStation */
 38         { USB_DEVICE(0x057c, 0x8403) }, /* AVM FRITZ!WLAN 11N v2 USB */
 39         { USB_DEVICE(0x0471, 0x209e) }, /* Philips (or NXP) PTA01 */
 40 
 41         { USB_DEVICE(0x0cf3, 0x7015),
 42           .driver_info = AR9287_USB },  /* Atheros */
 43         { USB_DEVICE(0x1668, 0x1200),
 44           .driver_info = AR9287_USB },  /* Verizon */
 45 
 46         { USB_DEVICE(0x0cf3, 0x7010),
 47           .driver_info = AR9280_USB },  /* Atheros */
 48         { USB_DEVICE(0x0846, 0x9018),
 49           .driver_info = AR9280_USB },  /* Netgear WNDA3200 */
 50         { USB_DEVICE(0x083A, 0xA704),
 51           .driver_info = AR9280_USB },  /* SMC Networks */
 52         { USB_DEVICE(0x0411, 0x017f),
 53           .driver_info = AR9280_USB },  /* Sony UWA-BR100 */
 54         { USB_DEVICE(0x0411, 0x0197),
 55           .driver_info = AR9280_USB },  /* Buffalo WLI-UV-AG300P */
 56         { USB_DEVICE(0x04da, 0x3904),
 57           .driver_info = AR9280_USB },
 58         { USB_DEVICE(0x0930, 0x0a08),
 59           .driver_info = AR9280_USB },  /* Toshiba WLM-20U2 and GN-1080 */
 60 
 61         { USB_DEVICE(0x0cf3, 0x20ff),
 62           .driver_info = STORAGE_DEVICE },
 63 
 64         { },
 65 };
 66 
 67 MODULE_DEVICE_TABLE(usb, ath9k_hif_usb_ids);
 68 
 69 static int __hif_usb_tx(struct hif_device_usb *hif_dev);
 70 
 71 static void hif_usb_regout_cb(struct urb *urb)
 72 {
 73         struct cmd_buf *cmd = (struct cmd_buf *)urb->context;
 74 
 75         switch (urb->status) {
 76         case 0:
 77                 break;
 78         case -ENOENT:
 79         case -ECONNRESET:
 80         case -ENODEV:
 81         case -ESHUTDOWN:
 82                 goto free;
 83         default:
 84                 break;
 85         }
 86 
 87         if (cmd) {
 88                 ath9k_htc_txcompletion_cb(cmd->hif_dev->htc_handle,
 89                                           cmd->skb, true);
 90                 kfree(cmd);
 91         }
 92 
 93         return;
 94 free:
 95         kfree_skb(cmd->skb);
 96         kfree(cmd);
 97 }
 98 
 99 static int hif_usb_send_regout(struct hif_device_usb *hif_dev,
100                                struct sk_buff *skb)
101 {
102         struct urb *urb;
103         struct cmd_buf *cmd;
104         int ret = 0;
105 
106         urb = usb_alloc_urb(0, GFP_KERNEL);
107         if (urb == NULL)
108                 return -ENOMEM;
109 
110         cmd = kzalloc(sizeof(*cmd), GFP_KERNEL);
111         if (cmd == NULL) {
112                 usb_free_urb(urb);
113                 return -ENOMEM;
114         }
115 
116         cmd->skb = skb;
117         cmd->hif_dev = hif_dev;
118 
119         usb_fill_int_urb(urb, hif_dev->udev,
120                          usb_sndintpipe(hif_dev->udev, USB_REG_OUT_PIPE),
121                          skb->data, skb->len,
122                          hif_usb_regout_cb, cmd, 1);
123 
124         usb_anchor_urb(urb, &hif_dev->regout_submitted);
125         ret = usb_submit_urb(urb, GFP_KERNEL);
126         if (ret) {
127                 usb_unanchor_urb(urb);
128                 kfree(cmd);
129         }
130         usb_free_urb(urb);
131 
132         return ret;
133 }
134 
135 static void hif_usb_mgmt_cb(struct urb *urb)
136 {
137         struct cmd_buf *cmd = (struct cmd_buf *)urb->context;
138         struct hif_device_usb *hif_dev;
139         bool txok = true;
140 
141         if (!cmd || !cmd->skb || !cmd->hif_dev)
142                 return;
143 
144         hif_dev = cmd->hif_dev;
145 
146         switch (urb->status) {
147         case 0:
148                 break;
149         case -ENOENT:
150         case -ECONNRESET:
151         case -ENODEV:
152         case -ESHUTDOWN:
153                 txok = false;
154 
155                 /*
156                  * If the URBs are being flushed, no need to complete
157                  * this packet.
158                  */
159                 spin_lock(&hif_dev->tx.tx_lock);
160                 if (hif_dev->tx.flags & HIF_USB_TX_FLUSH) {
161                         spin_unlock(&hif_dev->tx.tx_lock);
162                         dev_kfree_skb_any(cmd->skb);
163                         kfree(cmd);
164                         return;
165                 }
166                 spin_unlock(&hif_dev->tx.tx_lock);
167 
168                 break;
169         default:
170                 txok = false;
171                 break;
172         }
173 
174         skb_pull(cmd->skb, 4);
175         ath9k_htc_txcompletion_cb(cmd->hif_dev->htc_handle,
176                                   cmd->skb, txok);
177         kfree(cmd);
178 }
179 
180 static int hif_usb_send_mgmt(struct hif_device_usb *hif_dev,
181                              struct sk_buff *skb)
182 {
183         struct urb *urb;
184         struct cmd_buf *cmd;
185         int ret = 0;
186         __le16 *hdr;
187 
188         urb = usb_alloc_urb(0, GFP_ATOMIC);
189         if (urb == NULL)
190                 return -ENOMEM;
191 
192         cmd = kzalloc(sizeof(*cmd), GFP_ATOMIC);
193         if (cmd == NULL) {
194                 usb_free_urb(urb);
195                 return -ENOMEM;
196         }
197 
198         cmd->skb = skb;
199         cmd->hif_dev = hif_dev;
200 
201         hdr = (__le16 *) skb_push(skb, 4);
202         *hdr++ = cpu_to_le16(skb->len - 4);
203         *hdr++ = cpu_to_le16(ATH_USB_TX_STREAM_MODE_TAG);
204 
205         usb_fill_bulk_urb(urb, hif_dev->udev,
206                          usb_sndbulkpipe(hif_dev->udev, USB_WLAN_TX_PIPE),
207                          skb->data, skb->len,
208                          hif_usb_mgmt_cb, cmd);
209 
210         usb_anchor_urb(urb, &hif_dev->mgmt_submitted);
211         ret = usb_submit_urb(urb, GFP_ATOMIC);
212         if (ret) {
213                 usb_unanchor_urb(urb);
214                 kfree(cmd);
215         }
216         usb_free_urb(urb);
217 
218         return ret;
219 }
220 
221 static inline void ath9k_skb_queue_purge(struct hif_device_usb *hif_dev,
222                                          struct sk_buff_head *list)
223 {
224         struct sk_buff *skb;
225 
226         while ((skb = __skb_dequeue(list)) != NULL) {
227                 dev_kfree_skb_any(skb);
228         }
229 }
230 
231 static inline void ath9k_skb_queue_complete(struct hif_device_usb *hif_dev,
232                                             struct sk_buff_head *queue,
233                                             bool txok)
234 {
235         struct sk_buff *skb;
236 
237         while ((skb = __skb_dequeue(queue)) != NULL) {
238 #ifdef CONFIG_ATH9K_HTC_DEBUGFS
239                 int ln = skb->len;
240 #endif
241                 ath9k_htc_txcompletion_cb(hif_dev->htc_handle,
242                                           skb, txok);
243                 if (txok) {
244                         TX_STAT_INC(skb_success);
245                         TX_STAT_ADD(skb_success_bytes, ln);
246                 }
247                 else
248                         TX_STAT_INC(skb_failed);
249         }
250 }
251 
252 static void hif_usb_tx_cb(struct urb *urb)
253 {
254         struct tx_buf *tx_buf = (struct tx_buf *) urb->context;
255         struct hif_device_usb *hif_dev;
256         bool txok = true;
257 
258         if (!tx_buf || !tx_buf->hif_dev)
259                 return;
260 
261         hif_dev = tx_buf->hif_dev;
262 
263         switch (urb->status) {
264         case 0:
265                 break;
266         case -ENOENT:
267         case -ECONNRESET:
268         case -ENODEV:
269         case -ESHUTDOWN:
270                 txok = false;
271 
272                 /*
273                  * If the URBs are being flushed, no need to add this
274                  * URB to the free list.
275                  */
276                 spin_lock(&hif_dev->tx.tx_lock);
277                 if (hif_dev->tx.flags & HIF_USB_TX_FLUSH) {
278                         spin_unlock(&hif_dev->tx.tx_lock);
279                         ath9k_skb_queue_purge(hif_dev, &tx_buf->skb_queue);
280                         return;
281                 }
282                 spin_unlock(&hif_dev->tx.tx_lock);
283 
284                 break;
285         default:
286                 txok = false;
287                 break;
288         }
289 
290         ath9k_skb_queue_complete(hif_dev, &tx_buf->skb_queue, txok);
291 
292         /* Re-initialize the SKB queue */
293         tx_buf->len = tx_buf->offset = 0;
294         __skb_queue_head_init(&tx_buf->skb_queue);
295 
296         /* Add this TX buffer to the free list */
297         spin_lock(&hif_dev->tx.tx_lock);
298         list_move_tail(&tx_buf->list, &hif_dev->tx.tx_buf);
299         hif_dev->tx.tx_buf_cnt++;
300         if (!(hif_dev->tx.flags & HIF_USB_TX_STOP))
301                 __hif_usb_tx(hif_dev); /* Check for pending SKBs */
302         TX_STAT_INC(buf_completed);
303         spin_unlock(&hif_dev->tx.tx_lock);
304 }
305 
306 /* TX lock has to be taken */
307 static int __hif_usb_tx(struct hif_device_usb *hif_dev)
308 {
309         struct tx_buf *tx_buf = NULL;
310         struct sk_buff *nskb = NULL;
311         int ret = 0, i;
312         u16 tx_skb_cnt = 0;
313         u8 *buf;
314         __le16 *hdr;
315 
316         if (hif_dev->tx.tx_skb_cnt == 0)
317                 return 0;
318 
319         /* Check if a free TX buffer is available */
320         if (list_empty(&hif_dev->tx.tx_buf))
321                 return 0;
322 
323         tx_buf = list_first_entry(&hif_dev->tx.tx_buf, struct tx_buf, list);
324         list_move_tail(&tx_buf->list, &hif_dev->tx.tx_pending);
325         hif_dev->tx.tx_buf_cnt--;
326 
327         tx_skb_cnt = min_t(u16, hif_dev->tx.tx_skb_cnt, MAX_TX_AGGR_NUM);
328 
329         for (i = 0; i < tx_skb_cnt; i++) {
330                 nskb = __skb_dequeue(&hif_dev->tx.tx_skb_queue);
331 
332                 /* Should never be NULL */
333                 BUG_ON(!nskb);
334 
335                 hif_dev->tx.tx_skb_cnt--;
336 
337                 buf = tx_buf->buf;
338                 buf += tx_buf->offset;
339                 hdr = (__le16 *)buf;
340                 *hdr++ = cpu_to_le16(nskb->len);
341                 *hdr++ = cpu_to_le16(ATH_USB_TX_STREAM_MODE_TAG);
342                 buf += 4;
343                 memcpy(buf, nskb->data, nskb->len);
344                 tx_buf->len = nskb->len + 4;
345 
346                 if (i < (tx_skb_cnt - 1))
347                         tx_buf->offset += (((tx_buf->len - 1) / 4) + 1) * 4;
348 
349                 if (i == (tx_skb_cnt - 1))
350                         tx_buf->len += tx_buf->offset;
351 
352                 __skb_queue_tail(&tx_buf->skb_queue, nskb);
353                 TX_STAT_INC(skb_queued);
354         }
355 
356         usb_fill_bulk_urb(tx_buf->urb, hif_dev->udev,
357                           usb_sndbulkpipe(hif_dev->udev, USB_WLAN_TX_PIPE),
358                           tx_buf->buf, tx_buf->len,
359                           hif_usb_tx_cb, tx_buf);
360 
361         ret = usb_submit_urb(tx_buf->urb, GFP_ATOMIC);
362         if (ret) {
363                 tx_buf->len = tx_buf->offset = 0;
364                 ath9k_skb_queue_complete(hif_dev, &tx_buf->skb_queue, false);
365                 __skb_queue_head_init(&tx_buf->skb_queue);
366                 list_move_tail(&tx_buf->list, &hif_dev->tx.tx_buf);
367                 hif_dev->tx.tx_buf_cnt++;
368         }
369 
370         if (!ret)
371                 TX_STAT_INC(buf_queued);
372 
373         return ret;
374 }
375 
376 static int hif_usb_send_tx(struct hif_device_usb *hif_dev, struct sk_buff *skb)
377 {
378         struct ath9k_htc_tx_ctl *tx_ctl;
379         unsigned long flags;
380         int ret = 0;
381 
382         spin_lock_irqsave(&hif_dev->tx.tx_lock, flags);
383 
384         if (hif_dev->tx.flags & HIF_USB_TX_STOP) {
385                 spin_unlock_irqrestore(&hif_dev->tx.tx_lock, flags);
386                 return -ENODEV;
387         }
388 
389         /* Check if the max queue count has been reached */
390         if (hif_dev->tx.tx_skb_cnt > MAX_TX_BUF_NUM) {
391                 spin_unlock_irqrestore(&hif_dev->tx.tx_lock, flags);
392                 return -ENOMEM;
393         }
394 
395         spin_unlock_irqrestore(&hif_dev->tx.tx_lock, flags);
396 
397         tx_ctl = HTC_SKB_CB(skb);
398 
399         /* Mgmt/Beacon frames don't use the TX buffer pool */
400         if ((tx_ctl->type == ATH9K_HTC_MGMT) ||
401             (tx_ctl->type == ATH9K_HTC_BEACON)) {
402                 ret = hif_usb_send_mgmt(hif_dev, skb);
403         }
404 
405         spin_lock_irqsave(&hif_dev->tx.tx_lock, flags);
406 
407         if ((tx_ctl->type == ATH9K_HTC_NORMAL) ||
408             (tx_ctl->type == ATH9K_HTC_AMPDU)) {
409                 __skb_queue_tail(&hif_dev->tx.tx_skb_queue, skb);
410                 hif_dev->tx.tx_skb_cnt++;
411         }
412 
413         /* Check if AMPDUs have to be sent immediately */
414         if ((hif_dev->tx.tx_buf_cnt == MAX_TX_URB_NUM) &&
415             (hif_dev->tx.tx_skb_cnt < 2)) {
416                 __hif_usb_tx(hif_dev);
417         }
418 
419         spin_unlock_irqrestore(&hif_dev->tx.tx_lock, flags);
420 
421         return ret;
422 }
423 
424 static void hif_usb_start(void *hif_handle)
425 {
426         struct hif_device_usb *hif_dev = (struct hif_device_usb *)hif_handle;
427         unsigned long flags;
428 
429         hif_dev->flags |= HIF_USB_START;
430 
431         spin_lock_irqsave(&hif_dev->tx.tx_lock, flags);
432         hif_dev->tx.flags &= ~HIF_USB_TX_STOP;
433         spin_unlock_irqrestore(&hif_dev->tx.tx_lock, flags);
434 }
435 
436 static void hif_usb_stop(void *hif_handle)
437 {
438         struct hif_device_usb *hif_dev = (struct hif_device_usb *)hif_handle;
439         struct tx_buf *tx_buf = NULL, *tx_buf_tmp = NULL;
440         unsigned long flags;
441 
442         spin_lock_irqsave(&hif_dev->tx.tx_lock, flags);
443         ath9k_skb_queue_complete(hif_dev, &hif_dev->tx.tx_skb_queue, false);
444         hif_dev->tx.tx_skb_cnt = 0;
445         hif_dev->tx.flags |= HIF_USB_TX_STOP;
446         spin_unlock_irqrestore(&hif_dev->tx.tx_lock, flags);
447 
448         /* The pending URBs have to be canceled. */
449         list_for_each_entry_safe(tx_buf, tx_buf_tmp,
450                                  &hif_dev->tx.tx_pending, list) {
451                 usb_kill_urb(tx_buf->urb);
452         }
453 
454         usb_kill_anchored_urbs(&hif_dev->mgmt_submitted);
455 }
456 
457 static int hif_usb_send(void *hif_handle, u8 pipe_id, struct sk_buff *skb)
458 {
459         struct hif_device_usb *hif_dev = (struct hif_device_usb *)hif_handle;
460         int ret = 0;
461 
462         switch (pipe_id) {
463         case USB_WLAN_TX_PIPE:
464                 ret = hif_usb_send_tx(hif_dev, skb);
465                 break;
466         case USB_REG_OUT_PIPE:
467                 ret = hif_usb_send_regout(hif_dev, skb);
468                 break;
469         default:
470                 dev_err(&hif_dev->udev->dev,
471                         "ath9k_htc: Invalid TX pipe: %d\n", pipe_id);
472                 ret = -EINVAL;
473                 break;
474         }
475 
476         return ret;
477 }
478 
479 static inline bool check_index(struct sk_buff *skb, u8 idx)
480 {
481         struct ath9k_htc_tx_ctl *tx_ctl;
482 
483         tx_ctl = HTC_SKB_CB(skb);
484 
485         if ((tx_ctl->type == ATH9K_HTC_AMPDU) &&
486             (tx_ctl->sta_idx == idx))
487                 return true;
488 
489         return false;
490 }
491 
492 static void hif_usb_sta_drain(void *hif_handle, u8 idx)
493 {
494         struct hif_device_usb *hif_dev = (struct hif_device_usb *)hif_handle;
495         struct sk_buff *skb, *tmp;
496         unsigned long flags;
497 
498         spin_lock_irqsave(&hif_dev->tx.tx_lock, flags);
499 
500         skb_queue_walk_safe(&hif_dev->tx.tx_skb_queue, skb, tmp) {
501                 if (check_index(skb, idx)) {
502                         __skb_unlink(skb, &hif_dev->tx.tx_skb_queue);
503                         ath9k_htc_txcompletion_cb(hif_dev->htc_handle,
504                                                   skb, false);
505                         hif_dev->tx.tx_skb_cnt--;
506                         TX_STAT_INC(skb_failed);
507                 }
508         }
509 
510         spin_unlock_irqrestore(&hif_dev->tx.tx_lock, flags);
511 }
512 
513 static struct ath9k_htc_hif hif_usb = {
514         .transport = ATH9K_HIF_USB,
515         .name = "ath9k_hif_usb",
516 
517         .control_ul_pipe = USB_REG_OUT_PIPE,
518         .control_dl_pipe = USB_REG_IN_PIPE,
519 
520         .start = hif_usb_start,
521         .stop = hif_usb_stop,
522         .sta_drain = hif_usb_sta_drain,
523         .send = hif_usb_send,
524 };
525 
526 static void ath9k_hif_usb_rx_stream(struct hif_device_usb *hif_dev,
527                                     struct sk_buff *skb)
528 {
529         struct sk_buff *nskb, *skb_pool[MAX_PKT_NUM_IN_TRANSFER];
530         int index = 0, i, len = skb->len;
531         int rx_remain_len, rx_pkt_len;
532         u16 pool_index = 0;
533         u8 *ptr;
534 
535         spin_lock(&hif_dev->rx_lock);
536 
537         rx_remain_len = hif_dev->rx_remain_len;
538         rx_pkt_len = hif_dev->rx_transfer_len;
539 
540         if (rx_remain_len != 0) {
541                 struct sk_buff *remain_skb = hif_dev->remain_skb;
542 
543                 if (remain_skb) {
544                         ptr = (u8 *) remain_skb->data;
545 
546                         index = rx_remain_len;
547                         rx_remain_len -= hif_dev->rx_pad_len;
548                         ptr += rx_pkt_len;
549 
550                         memcpy(ptr, skb->data, rx_remain_len);
551 
552                         rx_pkt_len += rx_remain_len;
553                         hif_dev->rx_remain_len = 0;
554                         skb_put(remain_skb, rx_pkt_len);
555 
556                         skb_pool[pool_index++] = remain_skb;
557 
558                 } else {
559                         index = rx_remain_len;
560                 }
561         }
562 
563         spin_unlock(&hif_dev->rx_lock);
564 
565         while (index < len) {
566                 u16 pkt_len;
567                 u16 pkt_tag;
568                 u16 pad_len;
569                 int chk_idx;
570 
571                 ptr = (u8 *) skb->data;
572 
573                 pkt_len = get_unaligned_le16(ptr + index);
574                 pkt_tag = get_unaligned_le16(ptr + index + 2);
575 
576                 if (pkt_tag != ATH_USB_RX_STREAM_MODE_TAG) {
577                         RX_STAT_INC(skb_dropped);
578                         return;
579                 }
580 
581                 pad_len = 4 - (pkt_len & 0x3);
582                 if (pad_len == 4)
583                         pad_len = 0;
584 
585                 chk_idx = index;
586                 index = index + 4 + pkt_len + pad_len;
587 
588                 if (index > MAX_RX_BUF_SIZE) {
589                         spin_lock(&hif_dev->rx_lock);
590                         hif_dev->rx_remain_len = index - MAX_RX_BUF_SIZE;
591                         hif_dev->rx_transfer_len =
592                                 MAX_RX_BUF_SIZE - chk_idx - 4;
593                         hif_dev->rx_pad_len = pad_len;
594 
595                         nskb = __dev_alloc_skb(pkt_len + 32, GFP_ATOMIC);
596                         if (!nskb) {
597                                 dev_err(&hif_dev->udev->dev,
598                                         "ath9k_htc: RX memory allocation error\n");
599                                 spin_unlock(&hif_dev->rx_lock);
600                                 goto err;
601                         }
602                         skb_reserve(nskb, 32);
603                         RX_STAT_INC(skb_allocated);
604 
605                         memcpy(nskb->data, &(skb->data[chk_idx+4]),
606                                hif_dev->rx_transfer_len);
607 
608                         /* Record the buffer pointer */
609                         hif_dev->remain_skb = nskb;
610                         spin_unlock(&hif_dev->rx_lock);
611                 } else {
612                         nskb = __dev_alloc_skb(pkt_len + 32, GFP_ATOMIC);
613                         if (!nskb) {
614                                 dev_err(&hif_dev->udev->dev,
615                                         "ath9k_htc: RX memory allocation error\n");
616                                 goto err;
617                         }
618                         skb_reserve(nskb, 32);
619                         RX_STAT_INC(skb_allocated);
620 
621                         memcpy(nskb->data, &(skb->data[chk_idx+4]), pkt_len);
622                         skb_put(nskb, pkt_len);
623                         skb_pool[pool_index++] = nskb;
624                 }
625         }
626 
627 err:
628         for (i = 0; i < pool_index; i++) {
629                 RX_STAT_ADD(skb_completed_bytes, skb_pool[i]->len);
630                 ath9k_htc_rx_msg(hif_dev->htc_handle, skb_pool[i],
631                                  skb_pool[i]->len, USB_WLAN_RX_PIPE);
632                 RX_STAT_INC(skb_completed);
633         }
634 }
635 
636 static void ath9k_hif_usb_rx_cb(struct urb *urb)
637 {
638         struct sk_buff *skb = (struct sk_buff *) urb->context;
639         struct hif_device_usb *hif_dev =
640                 usb_get_intfdata(usb_ifnum_to_if(urb->dev, 0));
641         int ret;
642 
643         if (!skb)
644                 return;
645 
646         if (!hif_dev)
647                 goto free;
648 
649         switch (urb->status) {
650         case 0:
651                 break;
652         case -ENOENT:
653         case -ECONNRESET:
654         case -ENODEV:
655         case -ESHUTDOWN:
656                 goto free;
657         default:
658                 goto resubmit;
659         }
660 
661         if (likely(urb->actual_length != 0)) {
662                 skb_put(skb, urb->actual_length);
663                 ath9k_hif_usb_rx_stream(hif_dev, skb);
664         }
665 
666 resubmit:
667         skb_reset_tail_pointer(skb);
668         skb_trim(skb, 0);
669 
670         usb_anchor_urb(urb, &hif_dev->rx_submitted);
671         ret = usb_submit_urb(urb, GFP_ATOMIC);
672         if (ret) {
673                 usb_unanchor_urb(urb);
674                 goto free;
675         }
676 
677         return;
678 free:
679         kfree_skb(skb);
680 }
681 
682 static void ath9k_hif_usb_reg_in_cb(struct urb *urb)
683 {
684         struct sk_buff *skb = (struct sk_buff *) urb->context;
685         struct sk_buff *nskb;
686         struct hif_device_usb *hif_dev =
687                 usb_get_intfdata(usb_ifnum_to_if(urb->dev, 0));
688         int ret;
689 
690         if (!skb)
691                 return;
692 
693         if (!hif_dev)
694                 goto free;
695 
696         switch (urb->status) {
697         case 0:
698                 break;
699         case -ENOENT:
700         case -ECONNRESET:
701         case -ENODEV:
702         case -ESHUTDOWN:
703                 goto free;
704         default:
705                 skb_reset_tail_pointer(skb);
706                 skb_trim(skb, 0);
707 
708                 goto resubmit;
709         }
710 
711         if (likely(urb->actual_length != 0)) {
712                 skb_put(skb, urb->actual_length);
713 
714                 /* Process the command first */
715                 ath9k_htc_rx_msg(hif_dev->htc_handle, skb,
716                                  skb->len, USB_REG_IN_PIPE);
717 
718 
719                 nskb = alloc_skb(MAX_REG_IN_BUF_SIZE, GFP_ATOMIC);
720                 if (!nskb) {
721                         dev_err(&hif_dev->udev->dev,
722                                 "ath9k_htc: REG_IN memory allocation failure\n");
723                         urb->context = NULL;
724                         return;
725                 }
726 
727                 usb_fill_int_urb(urb, hif_dev->udev,
728                                  usb_rcvintpipe(hif_dev->udev,
729                                                  USB_REG_IN_PIPE),
730                                  nskb->data, MAX_REG_IN_BUF_SIZE,
731                                  ath9k_hif_usb_reg_in_cb, nskb, 1);
732         }
733 
734 resubmit:
735         usb_anchor_urb(urb, &hif_dev->reg_in_submitted);
736         ret = usb_submit_urb(urb, GFP_ATOMIC);
737         if (ret) {
738                 usb_unanchor_urb(urb);
739                 goto free;
740         }
741 
742         return;
743 free:
744         kfree_skb(skb);
745         urb->context = NULL;
746 }
747 
748 static void ath9k_hif_usb_dealloc_tx_urbs(struct hif_device_usb *hif_dev)
749 {
750         struct tx_buf *tx_buf = NULL, *tx_buf_tmp = NULL;
751         unsigned long flags;
752 
753         list_for_each_entry_safe(tx_buf, tx_buf_tmp,
754                                  &hif_dev->tx.tx_buf, list) {
755                 usb_kill_urb(tx_buf->urb);
756                 list_del(&tx_buf->list);
757                 usb_free_urb(tx_buf->urb);
758                 kfree(tx_buf->buf);
759                 kfree(tx_buf);
760         }
761 
762         spin_lock_irqsave(&hif_dev->tx.tx_lock, flags);
763         hif_dev->tx.flags |= HIF_USB_TX_FLUSH;
764         spin_unlock_irqrestore(&hif_dev->tx.tx_lock, flags);
765 
766         list_for_each_entry_safe(tx_buf, tx_buf_tmp,
767                                  &hif_dev->tx.tx_pending, list) {
768                 usb_kill_urb(tx_buf->urb);
769                 list_del(&tx_buf->list);
770                 usb_free_urb(tx_buf->urb);
771                 kfree(tx_buf->buf);
772                 kfree(tx_buf);
773         }
774 
775         usb_kill_anchored_urbs(&hif_dev->mgmt_submitted);
776 }
777 
778 static int ath9k_hif_usb_alloc_tx_urbs(struct hif_device_usb *hif_dev)
779 {
780         struct tx_buf *tx_buf;
781         int i;
782 
783         INIT_LIST_HEAD(&hif_dev->tx.tx_buf);
784         INIT_LIST_HEAD(&hif_dev->tx.tx_pending);
785         spin_lock_init(&hif_dev->tx.tx_lock);
786         __skb_queue_head_init(&hif_dev->tx.tx_skb_queue);
787         init_usb_anchor(&hif_dev->mgmt_submitted);
788 
789         for (i = 0; i < MAX_TX_URB_NUM; i++) {
790                 tx_buf = kzalloc(sizeof(struct tx_buf), GFP_KERNEL);
791                 if (!tx_buf)
792                         goto err;
793 
794                 tx_buf->buf = kzalloc(MAX_TX_BUF_SIZE, GFP_KERNEL);
795                 if (!tx_buf->buf)
796                         goto err;
797 
798                 tx_buf->urb = usb_alloc_urb(0, GFP_KERNEL);
799                 if (!tx_buf->urb)
800                         goto err;
801 
802                 tx_buf->hif_dev = hif_dev;
803                 __skb_queue_head_init(&tx_buf->skb_queue);
804 
805                 list_add_tail(&tx_buf->list, &hif_dev->tx.tx_buf);
806         }
807 
808         hif_dev->tx.tx_buf_cnt = MAX_TX_URB_NUM;
809 
810         return 0;
811 err:
812         if (tx_buf) {
813                 kfree(tx_buf->buf);
814                 kfree(tx_buf);
815         }
816         ath9k_hif_usb_dealloc_tx_urbs(hif_dev);
817         return -ENOMEM;
818 }
819 
820 static void ath9k_hif_usb_dealloc_rx_urbs(struct hif_device_usb *hif_dev)
821 {
822         usb_kill_anchored_urbs(&hif_dev->rx_submitted);
823 }
824 
825 static int ath9k_hif_usb_alloc_rx_urbs(struct hif_device_usb *hif_dev)
826 {
827         struct urb *urb = NULL;
828         struct sk_buff *skb = NULL;
829         int i, ret;
830 
831         init_usb_anchor(&hif_dev->rx_submitted);
832         spin_lock_init(&hif_dev->rx_lock);
833 
834         for (i = 0; i < MAX_RX_URB_NUM; i++) {
835 
836                 /* Allocate URB */
837                 urb = usb_alloc_urb(0, GFP_KERNEL);
838                 if (urb == NULL) {
839                         ret = -ENOMEM;
840                         goto err_urb;
841                 }
842 
843                 /* Allocate buffer */
844                 skb = alloc_skb(MAX_RX_BUF_SIZE, GFP_KERNEL);
845                 if (!skb) {
846                         ret = -ENOMEM;
847                         goto err_skb;
848                 }
849 
850                 usb_fill_bulk_urb(urb, hif_dev->udev,
851                                   usb_rcvbulkpipe(hif_dev->udev,
852                                                   USB_WLAN_RX_PIPE),
853                                   skb->data, MAX_RX_BUF_SIZE,
854                                   ath9k_hif_usb_rx_cb, skb);
855 
856                 /* Anchor URB */
857                 usb_anchor_urb(urb, &hif_dev->rx_submitted);
858 
859                 /* Submit URB */
860                 ret = usb_submit_urb(urb, GFP_KERNEL);
861                 if (ret) {
862                         usb_unanchor_urb(urb);
863                         goto err_submit;
864                 }
865 
866                 /*
867                  * Drop reference count.
868                  * This ensures that the URB is freed when killing them.
869                  */
870                 usb_free_urb(urb);
871         }
872 
873         return 0;
874 
875 err_submit:
876         kfree_skb(skb);
877 err_skb:
878         usb_free_urb(urb);
879 err_urb:
880         ath9k_hif_usb_dealloc_rx_urbs(hif_dev);
881         return ret;
882 }
883 
884 static void ath9k_hif_usb_dealloc_reg_in_urbs(struct hif_device_usb *hif_dev)
885 {
886         usb_kill_anchored_urbs(&hif_dev->reg_in_submitted);
887 }
888 
889 static int ath9k_hif_usb_alloc_reg_in_urbs(struct hif_device_usb *hif_dev)
890 {
891         struct urb *urb = NULL;
892         struct sk_buff *skb = NULL;
893         int i, ret;
894 
895         init_usb_anchor(&hif_dev->reg_in_submitted);
896 
897         for (i = 0; i < MAX_REG_IN_URB_NUM; i++) {
898 
899                 /* Allocate URB */
900                 urb = usb_alloc_urb(0, GFP_KERNEL);
901                 if (urb == NULL) {
902                         ret = -ENOMEM;
903                         goto err_urb;
904                 }
905 
906                 /* Allocate buffer */
907                 skb = alloc_skb(MAX_REG_IN_BUF_SIZE, GFP_KERNEL);
908                 if (!skb) {
909                         ret = -ENOMEM;
910                         goto err_skb;
911                 }
912 
913                 usb_fill_int_urb(urb, hif_dev->udev,
914                                   usb_rcvintpipe(hif_dev->udev,
915                                                   USB_REG_IN_PIPE),
916                                   skb->data, MAX_REG_IN_BUF_SIZE,
917                                   ath9k_hif_usb_reg_in_cb, skb, 1);
918 
919                 /* Anchor URB */
920                 usb_anchor_urb(urb, &hif_dev->reg_in_submitted);
921 
922                 /* Submit URB */
923                 ret = usb_submit_urb(urb, GFP_KERNEL);
924                 if (ret) {
925                         usb_unanchor_urb(urb);
926                         goto err_submit;
927                 }
928 
929                 /*
930                  * Drop reference count.
931                  * This ensures that the URB is freed when killing them.
932                  */
933                 usb_free_urb(urb);
934         }
935 
936         return 0;
937 
938 err_submit:
939         kfree_skb(skb);
940 err_skb:
941         usb_free_urb(urb);
942 err_urb:
943         ath9k_hif_usb_dealloc_reg_in_urbs(hif_dev);
944         return ret;
945 }
946 
947 static int ath9k_hif_usb_alloc_urbs(struct hif_device_usb *hif_dev)
948 {
949         /* Register Write */
950         init_usb_anchor(&hif_dev->regout_submitted);
951 
952         /* TX */
953         if (ath9k_hif_usb_alloc_tx_urbs(hif_dev) < 0)
954                 goto err;
955 
956         /* RX */
957         if (ath9k_hif_usb_alloc_rx_urbs(hif_dev) < 0)
958                 goto err_rx;
959 
960         /* Register Read */
961         if (ath9k_hif_usb_alloc_reg_in_urbs(hif_dev) < 0)
962                 goto err_reg;
963 
964         return 0;
965 err_reg:
966         ath9k_hif_usb_dealloc_rx_urbs(hif_dev);
967 err_rx:
968         ath9k_hif_usb_dealloc_tx_urbs(hif_dev);
969 err:
970         return -ENOMEM;
971 }
972 
973 static void ath9k_hif_usb_dealloc_urbs(struct hif_device_usb *hif_dev)
974 {
975         usb_kill_anchored_urbs(&hif_dev->regout_submitted);
976         ath9k_hif_usb_dealloc_reg_in_urbs(hif_dev);
977         ath9k_hif_usb_dealloc_tx_urbs(hif_dev);
978         ath9k_hif_usb_dealloc_rx_urbs(hif_dev);
979 }
980 
981 static int ath9k_hif_usb_download_fw(struct hif_device_usb *hif_dev)
982 {
983         int transfer, err;
984         const void *data = hif_dev->fw_data;
985         size_t len = hif_dev->fw_size;
986         u32 addr = AR9271_FIRMWARE;
987         u8 *buf = kzalloc(4096, GFP_KERNEL);
988         u32 firm_offset;
989 
990         if (!buf)
991                 return -ENOMEM;
992 
993         while (len) {
994                 transfer = min_t(size_t, len, 4096);
995                 memcpy(buf, data, transfer);
996 
997                 err = usb_control_msg(hif_dev->udev,
998                                       usb_sndctrlpipe(hif_dev->udev, 0),
999                                       FIRMWARE_DOWNLOAD, 0x40 | USB_DIR_OUT,
1000                                       addr >> 8, 0, buf, transfer, HZ);
1001                 if (err < 0) {
1002                         kfree(buf);
1003                         return err;
1004                 }
1005 
1006                 len -= transfer;
1007                 data += transfer;
1008                 addr += transfer;
1009         }
1010         kfree(buf);
1011 
1012         if (IS_AR7010_DEVICE(hif_dev->usb_device_id->driver_info))
1013                 firm_offset = AR7010_FIRMWARE_TEXT;
1014         else
1015                 firm_offset = AR9271_FIRMWARE_TEXT;
1016 
1017         /*
1018          * Issue FW download complete command to firmware.
1019          */
1020         err = usb_control_msg(hif_dev->udev, usb_sndctrlpipe(hif_dev->udev, 0),
1021                               FIRMWARE_DOWNLOAD_COMP,
1022                               0x40 | USB_DIR_OUT,
1023                               firm_offset >> 8, 0, NULL, 0, HZ);
1024         if (err)
1025                 return -EIO;
1026 
1027         dev_info(&hif_dev->udev->dev, "ath9k_htc: Transferred FW: %s, size: %ld\n",
1028                  hif_dev->fw_name, (unsigned long) hif_dev->fw_size);
1029 
1030         return 0;
1031 }
1032 
1033 static int ath9k_hif_usb_dev_init(struct hif_device_usb *hif_dev)
1034 {
1035         int ret;
1036 
1037         ret = ath9k_hif_usb_download_fw(hif_dev);
1038         if (ret) {
1039                 dev_err(&hif_dev->udev->dev,
1040                         "ath9k_htc: Firmware - %s download failed\n",
1041                         hif_dev->fw_name);
1042                 return ret;
1043         }
1044 
1045         /* Alloc URBs */
1046         ret = ath9k_hif_usb_alloc_urbs(hif_dev);
1047         if (ret) {
1048                 dev_err(&hif_dev->udev->dev,
1049                         "ath9k_htc: Unable to allocate URBs\n");
1050                 return ret;
1051         }
1052 
1053         return 0;
1054 }
1055 
1056 static void ath9k_hif_usb_dev_deinit(struct hif_device_usb *hif_dev)
1057 {
1058         ath9k_hif_usb_dealloc_urbs(hif_dev);
1059 }
1060 
1061 /*
1062  * If initialization fails or the FW cannot be retrieved,
1063  * detach the device.
1064  */
1065 static void ath9k_hif_usb_firmware_fail(struct hif_device_usb *hif_dev)
1066 {
1067         struct device *dev = &hif_dev->udev->dev;
1068         struct device *parent = dev->parent;
1069 
1070         complete_all(&hif_dev->fw_done);
1071 
1072         if (parent)
1073                 device_lock(parent);
1074 
1075         device_release_driver(dev);
1076 
1077         if (parent)
1078                 device_unlock(parent);
1079 }
1080 
1081 static void ath9k_hif_usb_firmware_cb(const struct firmware *fw, void *context);
1082 
1083 /* taken from iwlwifi */
1084 static int ath9k_hif_request_firmware(struct hif_device_usb *hif_dev,
1085                                       bool first)
1086 {
1087         char index[8], *chip;
1088         int ret;
1089 
1090         if (first) {
1091                 if (htc_use_dev_fw) {
1092                         hif_dev->fw_minor_index = FIRMWARE_MINOR_IDX_MAX + 1;
1093                         sprintf(index, "%s", "dev");
1094                 } else {
1095                         hif_dev->fw_minor_index = FIRMWARE_MINOR_IDX_MAX;
1096                         sprintf(index, "%d", hif_dev->fw_minor_index);
1097                 }
1098         } else {
1099                 hif_dev->fw_minor_index--;
1100                 sprintf(index, "%d", hif_dev->fw_minor_index);
1101         }
1102 
1103         /* test for FW 1.3 */
1104         if (MAJOR_VERSION_REQ == 1 && hif_dev->fw_minor_index == 3) {
1105                 const char *filename;
1106 
1107                 if (IS_AR7010_DEVICE(hif_dev->usb_device_id->driver_info))
1108                         filename = FIRMWARE_AR7010_1_1;
1109                 else
1110                         filename = FIRMWARE_AR9271;
1111 
1112                 /* expected fw locations:
1113                  * - htc_9271.fw   (stable version 1.3, depricated)
1114                  */
1115                 snprintf(hif_dev->fw_name, sizeof(hif_dev->fw_name),
1116                          "%s", filename);
1117 
1118         } else if (hif_dev->fw_minor_index < FIRMWARE_MINOR_IDX_MIN) {
1119                 dev_err(&hif_dev->udev->dev, "no suitable firmware found!\n");
1120 
1121                 return -ENOENT;
1122         } else {
1123                 if (IS_AR7010_DEVICE(hif_dev->usb_device_id->driver_info))
1124                         chip = "7010";
1125                 else
1126                         chip = "9271";
1127 
1128                 /* expected fw locations:
1129                  * - ath9k_htc/htc_9271-1.dev.0.fw (development version)
1130                  * - ath9k_htc/htc_9271-1.4.0.fw   (stable version)
1131                  */
1132                 snprintf(hif_dev->fw_name, sizeof(hif_dev->fw_name),
1133                          "%s/htc_%s-%d.%s.0.fw", HTC_FW_PATH,
1134                          chip, MAJOR_VERSION_REQ, index);
1135         }
1136 
1137         ret = request_firmware_nowait(THIS_MODULE, true, hif_dev->fw_name,
1138                                       &hif_dev->udev->dev, GFP_KERNEL,
1139                                       hif_dev, ath9k_hif_usb_firmware_cb);
1140         if (ret) {
1141                 dev_err(&hif_dev->udev->dev,
1142                         "ath9k_htc: Async request for firmware %s failed\n",
1143                         hif_dev->fw_name);
1144                 return ret;
1145         }
1146 
1147         dev_info(&hif_dev->udev->dev, "ath9k_htc: Firmware %s requested\n",
1148                  hif_dev->fw_name);
1149 
1150         return ret;
1151 }
1152 
1153 static void ath9k_hif_usb_firmware_cb(const struct firmware *fw, void *context)
1154 {
1155         struct hif_device_usb *hif_dev = context;
1156         int ret;
1157 
1158         if (!fw) {
1159                 ret = ath9k_hif_request_firmware(hif_dev, false);
1160                 if (!ret)
1161                         return;
1162 
1163                 dev_err(&hif_dev->udev->dev,
1164                         "ath9k_htc: Failed to get firmware %s\n",
1165                         hif_dev->fw_name);
1166                 goto err_fw;
1167         }
1168 
1169         hif_dev->htc_handle = ath9k_htc_hw_alloc(hif_dev, &hif_usb,
1170                                                  &hif_dev->udev->dev);
1171         if (hif_dev->htc_handle == NULL)
1172                 goto err_dev_alloc;
1173 
1174         hif_dev->fw_data = fw->data;
1175         hif_dev->fw_size = fw->size;
1176 
1177         /* Proceed with initialization */
1178 
1179         ret = ath9k_hif_usb_dev_init(hif_dev);
1180         if (ret)
1181                 goto err_dev_init;
1182 
1183         ret = ath9k_htc_hw_init(hif_dev->htc_handle,
1184                                 &hif_dev->interface->dev,
1185                                 hif_dev->usb_device_id->idProduct,
1186                                 hif_dev->udev->product,
1187                                 hif_dev->usb_device_id->driver_info);
1188         if (ret) {
1189                 ret = -EINVAL;
1190                 goto err_htc_hw_init;
1191         }
1192 
1193         release_firmware(fw);
1194         hif_dev->flags |= HIF_USB_READY;
1195         complete_all(&hif_dev->fw_done);
1196 
1197         return;
1198 
1199 err_htc_hw_init:
1200         ath9k_hif_usb_dev_deinit(hif_dev);
1201 err_dev_init:
1202         ath9k_htc_hw_free(hif_dev->htc_handle);
1203 err_dev_alloc:
1204         release_firmware(fw);
1205 err_fw:
1206         ath9k_hif_usb_firmware_fail(hif_dev);
1207 }
1208 
1209 /*
1210  * An exact copy of the function from zd1211rw.
1211  */
1212 static int send_eject_command(struct usb_interface *interface)
1213 {
1214         struct usb_device *udev = interface_to_usbdev(interface);
1215         struct usb_host_interface *iface_desc = &interface->altsetting[0];
1216         struct usb_endpoint_descriptor *endpoint;
1217         unsigned char *cmd;
1218         u8 bulk_out_ep;
1219         int r;
1220 
1221         /* Find bulk out endpoint */
1222         for (r = 1; r >= 0; r--) {
1223                 endpoint = &iface_desc->endpoint[r].desc;
1224                 if (usb_endpoint_dir_out(endpoint) &&
1225                     usb_endpoint_xfer_bulk(endpoint)) {
1226                         bulk_out_ep = endpoint->bEndpointAddress;
1227                         break;
1228                 }
1229         }
1230         if (r == -1) {
1231                 dev_err(&udev->dev,
1232                         "ath9k_htc: Could not find bulk out endpoint\n");
1233                 return -ENODEV;
1234         }
1235 
1236         cmd = kzalloc(31, GFP_KERNEL);
1237         if (cmd == NULL)
1238                 return -ENODEV;
1239 
1240         /* USB bulk command block */
1241         cmd[0] = 0x55;  /* bulk command signature */
1242         cmd[1] = 0x53;  /* bulk command signature */
1243         cmd[2] = 0x42;  /* bulk command signature */
1244         cmd[3] = 0x43;  /* bulk command signature */
1245         cmd[14] = 6;    /* command length */
1246 
1247         cmd[15] = 0x1b; /* SCSI command: START STOP UNIT */
1248         cmd[19] = 0x2;  /* eject disc */
1249 
1250         dev_info(&udev->dev, "Ejecting storage device...\n");
1251         r = usb_bulk_msg(udev, usb_sndbulkpipe(udev, bulk_out_ep),
1252                 cmd, 31, NULL, 2000);
1253         kfree(cmd);
1254         if (r)
1255                 return r;
1256 
1257         /* At this point, the device disconnects and reconnects with the real
1258          * ID numbers. */
1259 
1260         usb_set_intfdata(interface, NULL);
1261         return 0;
1262 }
1263 
1264 static int ath9k_hif_usb_probe(struct usb_interface *interface,
1265                                const struct usb_device_id *id)
1266 {
1267         struct usb_device *udev = interface_to_usbdev(interface);
1268         struct hif_device_usb *hif_dev;
1269         int ret = 0;
1270 
1271         if (id->driver_info == STORAGE_DEVICE)
1272                 return send_eject_command(interface);
1273 
1274         hif_dev = kzalloc(sizeof(struct hif_device_usb), GFP_KERNEL);
1275         if (!hif_dev) {
1276                 ret = -ENOMEM;
1277                 goto err_alloc;
1278         }
1279 
1280         usb_get_dev(udev);
1281 
1282         hif_dev->udev = udev;
1283         hif_dev->interface = interface;
1284         hif_dev->usb_device_id = id;
1285 #ifdef CONFIG_PM
1286         udev->reset_resume = 1;
1287 #endif
1288         usb_set_intfdata(interface, hif_dev);
1289 
1290         init_completion(&hif_dev->fw_done);
1291 
1292         ret = ath9k_hif_request_firmware(hif_dev, true);
1293         if (ret)
1294                 goto err_fw_req;
1295 
1296         return ret;
1297 
1298 err_fw_req:
1299         usb_set_intfdata(interface, NULL);
1300         kfree(hif_dev);
1301         usb_put_dev(udev);
1302 err_alloc:
1303         return ret;
1304 }
1305 
1306 static void ath9k_hif_usb_reboot(struct usb_device *udev)
1307 {
1308         u32 reboot_cmd = 0xffffffff;
1309         void *buf;
1310         int ret;
1311 
1312         buf = kmemdup(&reboot_cmd, 4, GFP_KERNEL);
1313         if (!buf)
1314                 return;
1315 
1316         ret = usb_interrupt_msg(udev, usb_sndintpipe(udev, USB_REG_OUT_PIPE),
1317                            buf, 4, NULL, HZ);
1318         if (ret)
1319                 dev_err(&udev->dev, "ath9k_htc: USB reboot failed\n");
1320 
1321         kfree(buf);
1322 }
1323 
1324 static void ath9k_hif_usb_disconnect(struct usb_interface *interface)
1325 {
1326         struct usb_device *udev = interface_to_usbdev(interface);
1327         struct hif_device_usb *hif_dev = usb_get_intfdata(interface);
1328         bool unplugged = (udev->state == USB_STATE_NOTATTACHED) ? true : false;
1329 
1330         if (!hif_dev)
1331                 return;
1332 
1333         wait_for_completion(&hif_dev->fw_done);
1334 
1335         if (hif_dev->flags & HIF_USB_READY) {
1336                 ath9k_htc_hw_deinit(hif_dev->htc_handle, unplugged);
1337                 ath9k_htc_hw_free(hif_dev->htc_handle);
1338                 ath9k_hif_usb_dev_deinit(hif_dev);
1339         }
1340 
1341         usb_set_intfdata(interface, NULL);
1342 
1343         /* If firmware was loaded we should drop it
1344          * go back to first stage bootloader. */
1345         if (!unplugged && (hif_dev->flags & HIF_USB_READY))
1346                 ath9k_hif_usb_reboot(udev);
1347 
1348         kfree(hif_dev);
1349         dev_info(&udev->dev, "ath9k_htc: USB layer deinitialized\n");
1350         usb_put_dev(udev);
1351 }
1352 
1353 #ifdef CONFIG_PM
1354 static int ath9k_hif_usb_suspend(struct usb_interface *interface,
1355                                  pm_message_t message)
1356 {
1357         struct hif_device_usb *hif_dev = usb_get_intfdata(interface);
1358 
1359         /*
1360          * The device has to be set to FULLSLEEP mode in case no
1361          * interface is up.
1362          */
1363         if (!(hif_dev->flags & HIF_USB_START))
1364                 ath9k_htc_suspend(hif_dev->htc_handle);
1365 
1366         wait_for_completion(&hif_dev->fw_done);
1367 
1368         if (hif_dev->flags & HIF_USB_READY)
1369                 ath9k_hif_usb_dealloc_urbs(hif_dev);
1370 
1371         return 0;
1372 }
1373 
1374 static int ath9k_hif_usb_resume(struct usb_interface *interface)
1375 {
1376         struct hif_device_usb *hif_dev = usb_get_intfdata(interface);
1377         struct htc_target *htc_handle = hif_dev->htc_handle;
1378         int ret;
1379         const struct firmware *fw;
1380 
1381         ret = ath9k_hif_usb_alloc_urbs(hif_dev);
1382         if (ret)
1383                 return ret;
1384 
1385         if (hif_dev->flags & HIF_USB_READY) {
1386                 /* request cached firmware during suspend/resume cycle */
1387                 ret = request_firmware(&fw, hif_dev->fw_name,
1388                                        &hif_dev->udev->dev);
1389                 if (ret)
1390                         goto fail_resume;
1391 
1392                 hif_dev->fw_data = fw->data;
1393                 hif_dev->fw_size = fw->size;
1394                 ret = ath9k_hif_usb_download_fw(hif_dev);
1395                 release_firmware(fw);
1396                 if (ret)
1397                         goto fail_resume;
1398         } else {
1399                 ath9k_hif_usb_dealloc_urbs(hif_dev);
1400                 return -EIO;
1401         }
1402 
1403         mdelay(100);
1404 
1405         ret = ath9k_htc_resume(htc_handle);
1406 
1407         if (ret)
1408                 goto fail_resume;
1409 
1410         return 0;
1411 
1412 fail_resume:
1413         ath9k_hif_usb_dealloc_urbs(hif_dev);
1414 
1415         return ret;
1416 }
1417 #endif
1418 
1419 static struct usb_driver ath9k_hif_usb_driver = {
1420         .name = KBUILD_MODNAME,
1421         .probe = ath9k_hif_usb_probe,
1422         .disconnect = ath9k_hif_usb_disconnect,
1423 #ifdef CONFIG_PM
1424         .suspend = ath9k_hif_usb_suspend,
1425         .resume = ath9k_hif_usb_resume,
1426         .reset_resume = ath9k_hif_usb_resume,
1427 #endif
1428         .id_table = ath9k_hif_usb_ids,
1429         .soft_unbind = 1,
1430         .disable_hub_initiated_lpm = 1,
1431 };
1432 
1433 int ath9k_hif_usb_init(void)
1434 {
1435         return usb_register(&ath9k_hif_usb_driver);
1436 }
1437 
1438 void ath9k_hif_usb_exit(void)
1439 {
1440         usb_deregister(&ath9k_hif_usb_driver);
1441 }
1442 

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