GNU Linux-libre 4.19.207-gnu1
[releases.git] / drivers / net / wireless / ath / ath9k / hif_usb.c
1 /*
2  * Copyright (c) 2010-2011 Atheros Communications Inc.
3  *
4  * Permission to use, copy, modify, and/or distribute this software for any
5  * purpose with or without fee is hereby granted, provided that the above
6  * copyright notice and this permission notice appear in all copies.
7  *
8  * THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL WARRANTIES
9  * WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF
10  * MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR
11  * ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES
12  * WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN
13  * ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF
14  * OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
15  */
16
17 #include <asm/unaligned.h>
18 #include "htc.h"
19
20 MODULE_FIRMWARE(HTC_7010_MODULE_FW);
21 MODULE_FIRMWARE(HTC_9271_MODULE_FW);
22
23 static const struct usb_device_id ath9k_hif_usb_ids[] = {
24         { USB_DEVICE(0x0cf3, 0x9271) }, /* Atheros */
25         { USB_DEVICE(0x0cf3, 0x1006) }, /* Atheros */
26         { USB_DEVICE(0x0846, 0x9030) }, /* Netgear N150 */
27         { USB_DEVICE(0x07b8, 0x9271) }, /* Altai WA1011N-GU */
28         { USB_DEVICE(0x07D1, 0x3A10) }, /* Dlink Wireless 150 */
29         { USB_DEVICE(0x13D3, 0x3327) }, /* Azurewave */
30         { USB_DEVICE(0x13D3, 0x3328) }, /* Azurewave */
31         { USB_DEVICE(0x13D3, 0x3346) }, /* IMC Networks */
32         { USB_DEVICE(0x13D3, 0x3348) }, /* Azurewave */
33         { USB_DEVICE(0x13D3, 0x3349) }, /* Azurewave */
34         { USB_DEVICE(0x13D3, 0x3350) }, /* Azurewave */
35         { USB_DEVICE(0x04CA, 0x4605) }, /* Liteon */
36         { USB_DEVICE(0x040D, 0x3801) }, /* VIA */
37         { USB_DEVICE(0x0cf3, 0xb003) }, /* Ubiquiti WifiStation Ext */
38         { USB_DEVICE(0x0cf3, 0xb002) }, /* Ubiquiti WifiStation */
39         { USB_DEVICE(0x057c, 0x8403) }, /* AVM FRITZ!WLAN 11N v2 USB */
40         { USB_DEVICE(0x0471, 0x209e) }, /* Philips (or NXP) PTA01 */
41         { USB_DEVICE(0x1eda, 0x2315) }, /* AirTies */
42
43         { USB_DEVICE(0x0cf3, 0x7015),
44           .driver_info = AR9287_USB },  /* Atheros */
45         { USB_DEVICE(0x1668, 0x1200),
46           .driver_info = AR9287_USB },  /* Verizon */
47
48         { USB_DEVICE(0x0cf3, 0x7010),
49           .driver_info = AR9280_USB },  /* Atheros */
50         { USB_DEVICE(0x0846, 0x9018),
51           .driver_info = AR9280_USB },  /* Netgear WNDA3200 */
52         { USB_DEVICE(0x083A, 0xA704),
53           .driver_info = AR9280_USB },  /* SMC Networks */
54         { USB_DEVICE(0x0411, 0x017f),
55           .driver_info = AR9280_USB },  /* Sony UWA-BR100 */
56         { USB_DEVICE(0x0411, 0x0197),
57           .driver_info = AR9280_USB },  /* Buffalo WLI-UV-AG300P */
58         { USB_DEVICE(0x04da, 0x3904),
59           .driver_info = AR9280_USB },
60         { USB_DEVICE(0x0930, 0x0a08),
61           .driver_info = AR9280_USB },  /* Toshiba WLM-20U2 and GN-1080 */
62
63         { USB_DEVICE(0x0cf3, 0x20ff),
64           .driver_info = STORAGE_DEVICE },
65
66         { },
67 };
68
69 MODULE_DEVICE_TABLE(usb, ath9k_hif_usb_ids);
70
71 static int __hif_usb_tx(struct hif_device_usb *hif_dev);
72
73 static void hif_usb_regout_cb(struct urb *urb)
74 {
75         struct cmd_buf *cmd = (struct cmd_buf *)urb->context;
76
77         switch (urb->status) {
78         case 0:
79                 break;
80         case -ENOENT:
81         case -ECONNRESET:
82         case -ENODEV:
83         case -ESHUTDOWN:
84                 goto free;
85         default:
86                 break;
87         }
88
89         if (cmd) {
90                 ath9k_htc_txcompletion_cb(cmd->hif_dev->htc_handle,
91                                           cmd->skb, true);
92                 kfree(cmd);
93         }
94
95         return;
96 free:
97         kfree_skb(cmd->skb);
98         kfree(cmd);
99 }
100
101 static int hif_usb_send_regout(struct hif_device_usb *hif_dev,
102                                struct sk_buff *skb)
103 {
104         struct urb *urb;
105         struct cmd_buf *cmd;
106         int ret = 0;
107
108         urb = usb_alloc_urb(0, GFP_KERNEL);
109         if (urb == NULL)
110                 return -ENOMEM;
111
112         cmd = kzalloc(sizeof(*cmd), GFP_KERNEL);
113         if (cmd == NULL) {
114                 usb_free_urb(urb);
115                 return -ENOMEM;
116         }
117
118         cmd->skb = skb;
119         cmd->hif_dev = hif_dev;
120
121         usb_fill_int_urb(urb, hif_dev->udev,
122                          usb_sndintpipe(hif_dev->udev, USB_REG_OUT_PIPE),
123                          skb->data, skb->len,
124                          hif_usb_regout_cb, cmd, 1);
125
126         usb_anchor_urb(urb, &hif_dev->regout_submitted);
127         ret = usb_submit_urb(urb, GFP_KERNEL);
128         if (ret) {
129                 usb_unanchor_urb(urb);
130                 kfree(cmd);
131         }
132         usb_free_urb(urb);
133
134         return ret;
135 }
136
137 static void hif_usb_mgmt_cb(struct urb *urb)
138 {
139         struct cmd_buf *cmd = (struct cmd_buf *)urb->context;
140         struct hif_device_usb *hif_dev;
141         unsigned long flags;
142         bool txok = true;
143
144         if (!cmd || !cmd->skb || !cmd->hif_dev)
145                 return;
146
147         hif_dev = cmd->hif_dev;
148
149         switch (urb->status) {
150         case 0:
151                 break;
152         case -ENOENT:
153         case -ECONNRESET:
154         case -ENODEV:
155         case -ESHUTDOWN:
156                 txok = false;
157
158                 /*
159                  * If the URBs are being flushed, no need to complete
160                  * this packet.
161                  */
162                 spin_lock_irqsave(&hif_dev->tx.tx_lock, flags);
163                 if (hif_dev->tx.flags & HIF_USB_TX_FLUSH) {
164                         spin_unlock_irqrestore(&hif_dev->tx.tx_lock, flags);
165                         dev_kfree_skb_any(cmd->skb);
166                         kfree(cmd);
167                         return;
168                 }
169                 spin_unlock_irqrestore(&hif_dev->tx.tx_lock, flags);
170
171                 break;
172         default:
173                 txok = false;
174                 break;
175         }
176
177         skb_pull(cmd->skb, 4);
178         ath9k_htc_txcompletion_cb(cmd->hif_dev->htc_handle,
179                                   cmd->skb, txok);
180         kfree(cmd);
181 }
182
183 static int hif_usb_send_mgmt(struct hif_device_usb *hif_dev,
184                              struct sk_buff *skb)
185 {
186         struct urb *urb;
187         struct cmd_buf *cmd;
188         int ret = 0;
189         __le16 *hdr;
190
191         urb = usb_alloc_urb(0, GFP_ATOMIC);
192         if (urb == NULL)
193                 return -ENOMEM;
194
195         cmd = kzalloc(sizeof(*cmd), GFP_ATOMIC);
196         if (cmd == NULL) {
197                 usb_free_urb(urb);
198                 return -ENOMEM;
199         }
200
201         cmd->skb = skb;
202         cmd->hif_dev = hif_dev;
203
204         hdr = skb_push(skb, 4);
205         *hdr++ = cpu_to_le16(skb->len - 4);
206         *hdr++ = cpu_to_le16(ATH_USB_TX_STREAM_MODE_TAG);
207
208         usb_fill_bulk_urb(urb, hif_dev->udev,
209                          usb_sndbulkpipe(hif_dev->udev, USB_WLAN_TX_PIPE),
210                          skb->data, skb->len,
211                          hif_usb_mgmt_cb, cmd);
212
213         usb_anchor_urb(urb, &hif_dev->mgmt_submitted);
214         ret = usb_submit_urb(urb, GFP_ATOMIC);
215         if (ret) {
216                 usb_unanchor_urb(urb);
217                 kfree(cmd);
218         }
219         usb_free_urb(urb);
220
221         return ret;
222 }
223
224 static inline void ath9k_skb_queue_purge(struct hif_device_usb *hif_dev,
225                                          struct sk_buff_head *list)
226 {
227         struct sk_buff *skb;
228
229         while ((skb = __skb_dequeue(list)) != NULL) {
230                 dev_kfree_skb_any(skb);
231         }
232 }
233
234 static inline void ath9k_skb_queue_complete(struct hif_device_usb *hif_dev,
235                                             struct sk_buff_head *queue,
236                                             bool txok)
237 {
238         struct sk_buff *skb;
239
240         while ((skb = __skb_dequeue(queue)) != NULL) {
241 #ifdef CONFIG_ATH9K_HTC_DEBUGFS
242                 int ln = skb->len;
243 #endif
244                 ath9k_htc_txcompletion_cb(hif_dev->htc_handle,
245                                           skb, txok);
246                 if (txok) {
247                         TX_STAT_INC(skb_success);
248                         TX_STAT_ADD(skb_success_bytes, ln);
249                 }
250                 else
251                         TX_STAT_INC(skb_failed);
252         }
253 }
254
255 static void hif_usb_tx_cb(struct urb *urb)
256 {
257         struct tx_buf *tx_buf = (struct tx_buf *) urb->context;
258         struct hif_device_usb *hif_dev;
259         bool txok = true;
260
261         if (!tx_buf || !tx_buf->hif_dev)
262                 return;
263
264         hif_dev = tx_buf->hif_dev;
265
266         switch (urb->status) {
267         case 0:
268                 break;
269         case -ENOENT:
270         case -ECONNRESET:
271         case -ENODEV:
272         case -ESHUTDOWN:
273                 txok = false;
274
275                 /*
276                  * If the URBs are being flushed, no need to add this
277                  * URB to the free list.
278                  */
279                 spin_lock(&hif_dev->tx.tx_lock);
280                 if (hif_dev->tx.flags & HIF_USB_TX_FLUSH) {
281                         spin_unlock(&hif_dev->tx.tx_lock);
282                         ath9k_skb_queue_purge(hif_dev, &tx_buf->skb_queue);
283                         return;
284                 }
285                 spin_unlock(&hif_dev->tx.tx_lock);
286
287                 break;
288         default:
289                 txok = false;
290                 break;
291         }
292
293         ath9k_skb_queue_complete(hif_dev, &tx_buf->skb_queue, txok);
294
295         /* Re-initialize the SKB queue */
296         tx_buf->len = tx_buf->offset = 0;
297         __skb_queue_head_init(&tx_buf->skb_queue);
298
299         /* Add this TX buffer to the free list */
300         spin_lock(&hif_dev->tx.tx_lock);
301         list_move_tail(&tx_buf->list, &hif_dev->tx.tx_buf);
302         hif_dev->tx.tx_buf_cnt++;
303         if (!(hif_dev->tx.flags & HIF_USB_TX_STOP))
304                 __hif_usb_tx(hif_dev); /* Check for pending SKBs */
305         TX_STAT_INC(buf_completed);
306         spin_unlock(&hif_dev->tx.tx_lock);
307 }
308
309 /* TX lock has to be taken */
310 static int __hif_usb_tx(struct hif_device_usb *hif_dev)
311 {
312         struct tx_buf *tx_buf = NULL;
313         struct sk_buff *nskb = NULL;
314         int ret = 0, i;
315         u16 tx_skb_cnt = 0;
316         u8 *buf;
317         __le16 *hdr;
318
319         if (hif_dev->tx.tx_skb_cnt == 0)
320                 return 0;
321
322         /* Check if a free TX buffer is available */
323         if (list_empty(&hif_dev->tx.tx_buf))
324                 return 0;
325
326         tx_buf = list_first_entry(&hif_dev->tx.tx_buf, struct tx_buf, list);
327         list_move_tail(&tx_buf->list, &hif_dev->tx.tx_pending);
328         hif_dev->tx.tx_buf_cnt--;
329
330         tx_skb_cnt = min_t(u16, hif_dev->tx.tx_skb_cnt, MAX_TX_AGGR_NUM);
331
332         for (i = 0; i < tx_skb_cnt; i++) {
333                 nskb = __skb_dequeue(&hif_dev->tx.tx_skb_queue);
334
335                 /* Should never be NULL */
336                 BUG_ON(!nskb);
337
338                 hif_dev->tx.tx_skb_cnt--;
339
340                 buf = tx_buf->buf;
341                 buf += tx_buf->offset;
342                 hdr = (__le16 *)buf;
343                 *hdr++ = cpu_to_le16(nskb->len);
344                 *hdr++ = cpu_to_le16(ATH_USB_TX_STREAM_MODE_TAG);
345                 buf += 4;
346                 memcpy(buf, nskb->data, nskb->len);
347                 tx_buf->len = nskb->len + 4;
348
349                 if (i < (tx_skb_cnt - 1))
350                         tx_buf->offset += (((tx_buf->len - 1) / 4) + 1) * 4;
351
352                 if (i == (tx_skb_cnt - 1))
353                         tx_buf->len += tx_buf->offset;
354
355                 __skb_queue_tail(&tx_buf->skb_queue, nskb);
356                 TX_STAT_INC(skb_queued);
357         }
358
359         usb_fill_bulk_urb(tx_buf->urb, hif_dev->udev,
360                           usb_sndbulkpipe(hif_dev->udev, USB_WLAN_TX_PIPE),
361                           tx_buf->buf, tx_buf->len,
362                           hif_usb_tx_cb, tx_buf);
363
364         ret = usb_submit_urb(tx_buf->urb, GFP_ATOMIC);
365         if (ret) {
366                 tx_buf->len = tx_buf->offset = 0;
367                 ath9k_skb_queue_complete(hif_dev, &tx_buf->skb_queue, false);
368                 __skb_queue_head_init(&tx_buf->skb_queue);
369                 list_move_tail(&tx_buf->list, &hif_dev->tx.tx_buf);
370                 hif_dev->tx.tx_buf_cnt++;
371         }
372
373         if (!ret)
374                 TX_STAT_INC(buf_queued);
375
376         return ret;
377 }
378
379 static int hif_usb_send_tx(struct hif_device_usb *hif_dev, struct sk_buff *skb)
380 {
381         struct ath9k_htc_tx_ctl *tx_ctl;
382         unsigned long flags;
383         int ret = 0;
384
385         spin_lock_irqsave(&hif_dev->tx.tx_lock, flags);
386
387         if (hif_dev->tx.flags & HIF_USB_TX_STOP) {
388                 spin_unlock_irqrestore(&hif_dev->tx.tx_lock, flags);
389                 return -ENODEV;
390         }
391
392         /* Check if the max queue count has been reached */
393         if (hif_dev->tx.tx_skb_cnt > MAX_TX_BUF_NUM) {
394                 spin_unlock_irqrestore(&hif_dev->tx.tx_lock, flags);
395                 return -ENOMEM;
396         }
397
398         spin_unlock_irqrestore(&hif_dev->tx.tx_lock, flags);
399
400         tx_ctl = HTC_SKB_CB(skb);
401
402         /* Mgmt/Beacon frames don't use the TX buffer pool */
403         if ((tx_ctl->type == ATH9K_HTC_MGMT) ||
404             (tx_ctl->type == ATH9K_HTC_BEACON)) {
405                 ret = hif_usb_send_mgmt(hif_dev, skb);
406         }
407
408         spin_lock_irqsave(&hif_dev->tx.tx_lock, flags);
409
410         if ((tx_ctl->type == ATH9K_HTC_NORMAL) ||
411             (tx_ctl->type == ATH9K_HTC_AMPDU)) {
412                 __skb_queue_tail(&hif_dev->tx.tx_skb_queue, skb);
413                 hif_dev->tx.tx_skb_cnt++;
414         }
415
416         /* Check if AMPDUs have to be sent immediately */
417         if ((hif_dev->tx.tx_buf_cnt == MAX_TX_URB_NUM) &&
418             (hif_dev->tx.tx_skb_cnt < 2)) {
419                 __hif_usb_tx(hif_dev);
420         }
421
422         spin_unlock_irqrestore(&hif_dev->tx.tx_lock, flags);
423
424         return ret;
425 }
426
427 static void hif_usb_start(void *hif_handle)
428 {
429         struct hif_device_usb *hif_dev = hif_handle;
430         unsigned long flags;
431
432         hif_dev->flags |= HIF_USB_START;
433
434         spin_lock_irqsave(&hif_dev->tx.tx_lock, flags);
435         hif_dev->tx.flags &= ~HIF_USB_TX_STOP;
436         spin_unlock_irqrestore(&hif_dev->tx.tx_lock, flags);
437 }
438
439 static void hif_usb_stop(void *hif_handle)
440 {
441         struct hif_device_usb *hif_dev = hif_handle;
442         struct tx_buf *tx_buf = NULL, *tx_buf_tmp = NULL;
443         unsigned long flags;
444
445         spin_lock_irqsave(&hif_dev->tx.tx_lock, flags);
446         ath9k_skb_queue_complete(hif_dev, &hif_dev->tx.tx_skb_queue, false);
447         hif_dev->tx.tx_skb_cnt = 0;
448         hif_dev->tx.flags |= HIF_USB_TX_STOP;
449         spin_unlock_irqrestore(&hif_dev->tx.tx_lock, flags);
450
451         /* The pending URBs have to be canceled. */
452         spin_lock_irqsave(&hif_dev->tx.tx_lock, flags);
453         list_for_each_entry_safe(tx_buf, tx_buf_tmp,
454                                  &hif_dev->tx.tx_pending, list) {
455                 usb_get_urb(tx_buf->urb);
456                 spin_unlock_irqrestore(&hif_dev->tx.tx_lock, flags);
457                 usb_kill_urb(tx_buf->urb);
458                 list_del(&tx_buf->list);
459                 usb_free_urb(tx_buf->urb);
460                 kfree(tx_buf->buf);
461                 kfree(tx_buf);
462                 spin_lock_irqsave(&hif_dev->tx.tx_lock, flags);
463         }
464         spin_unlock_irqrestore(&hif_dev->tx.tx_lock, flags);
465
466         usb_kill_anchored_urbs(&hif_dev->mgmt_submitted);
467 }
468
469 static int hif_usb_send(void *hif_handle, u8 pipe_id, struct sk_buff *skb)
470 {
471         struct hif_device_usb *hif_dev = hif_handle;
472         int ret = 0;
473
474         switch (pipe_id) {
475         case USB_WLAN_TX_PIPE:
476                 ret = hif_usb_send_tx(hif_dev, skb);
477                 break;
478         case USB_REG_OUT_PIPE:
479                 ret = hif_usb_send_regout(hif_dev, skb);
480                 break;
481         default:
482                 dev_err(&hif_dev->udev->dev,
483                         "ath9k_htc: Invalid TX pipe: %d\n", pipe_id);
484                 ret = -EINVAL;
485                 break;
486         }
487
488         return ret;
489 }
490
491 static inline bool check_index(struct sk_buff *skb, u8 idx)
492 {
493         struct ath9k_htc_tx_ctl *tx_ctl;
494
495         tx_ctl = HTC_SKB_CB(skb);
496
497         if ((tx_ctl->type == ATH9K_HTC_AMPDU) &&
498             (tx_ctl->sta_idx == idx))
499                 return true;
500
501         return false;
502 }
503
504 static void hif_usb_sta_drain(void *hif_handle, u8 idx)
505 {
506         struct hif_device_usb *hif_dev = hif_handle;
507         struct sk_buff *skb, *tmp;
508         unsigned long flags;
509
510         spin_lock_irqsave(&hif_dev->tx.tx_lock, flags);
511
512         skb_queue_walk_safe(&hif_dev->tx.tx_skb_queue, skb, tmp) {
513                 if (check_index(skb, idx)) {
514                         __skb_unlink(skb, &hif_dev->tx.tx_skb_queue);
515                         ath9k_htc_txcompletion_cb(hif_dev->htc_handle,
516                                                   skb, false);
517                         hif_dev->tx.tx_skb_cnt--;
518                         TX_STAT_INC(skb_failed);
519                 }
520         }
521
522         spin_unlock_irqrestore(&hif_dev->tx.tx_lock, flags);
523 }
524
525 static struct ath9k_htc_hif hif_usb = {
526         .transport = ATH9K_HIF_USB,
527         .name = "ath9k_hif_usb",
528
529         .control_ul_pipe = USB_REG_OUT_PIPE,
530         .control_dl_pipe = USB_REG_IN_PIPE,
531
532         .start = hif_usb_start,
533         .stop = hif_usb_stop,
534         .sta_drain = hif_usb_sta_drain,
535         .send = hif_usb_send,
536 };
537
538 static void ath9k_hif_usb_rx_stream(struct hif_device_usb *hif_dev,
539                                     struct sk_buff *skb)
540 {
541         struct sk_buff *nskb, *skb_pool[MAX_PKT_NUM_IN_TRANSFER];
542         int index = 0, i, len = skb->len;
543         int rx_remain_len, rx_pkt_len;
544         u16 pool_index = 0;
545         u8 *ptr;
546
547         spin_lock(&hif_dev->rx_lock);
548
549         rx_remain_len = hif_dev->rx_remain_len;
550         rx_pkt_len = hif_dev->rx_transfer_len;
551
552         if (rx_remain_len != 0) {
553                 struct sk_buff *remain_skb = hif_dev->remain_skb;
554
555                 if (remain_skb) {
556                         ptr = (u8 *) remain_skb->data;
557
558                         index = rx_remain_len;
559                         rx_remain_len -= hif_dev->rx_pad_len;
560                         ptr += rx_pkt_len;
561
562                         memcpy(ptr, skb->data, rx_remain_len);
563
564                         rx_pkt_len += rx_remain_len;
565                         hif_dev->rx_remain_len = 0;
566                         skb_put(remain_skb, rx_pkt_len);
567
568                         skb_pool[pool_index++] = remain_skb;
569
570                 } else {
571                         index = rx_remain_len;
572                 }
573         }
574
575         spin_unlock(&hif_dev->rx_lock);
576
577         while (index < len) {
578                 u16 pkt_len;
579                 u16 pkt_tag;
580                 u16 pad_len;
581                 int chk_idx;
582
583                 ptr = (u8 *) skb->data;
584
585                 pkt_len = get_unaligned_le16(ptr + index);
586                 pkt_tag = get_unaligned_le16(ptr + index + 2);
587
588                 if (pkt_tag != ATH_USB_RX_STREAM_MODE_TAG) {
589                         RX_STAT_INC(skb_dropped);
590                         return;
591                 }
592
593                 pad_len = 4 - (pkt_len & 0x3);
594                 if (pad_len == 4)
595                         pad_len = 0;
596
597                 chk_idx = index;
598                 index = index + 4 + pkt_len + pad_len;
599
600                 if (index > MAX_RX_BUF_SIZE) {
601                         spin_lock(&hif_dev->rx_lock);
602                         hif_dev->rx_remain_len = index - MAX_RX_BUF_SIZE;
603                         hif_dev->rx_transfer_len =
604                                 MAX_RX_BUF_SIZE - chk_idx - 4;
605                         hif_dev->rx_pad_len = pad_len;
606
607                         nskb = __dev_alloc_skb(pkt_len + 32, GFP_ATOMIC);
608                         if (!nskb) {
609                                 dev_err(&hif_dev->udev->dev,
610                                         "ath9k_htc: RX memory allocation error\n");
611                                 spin_unlock(&hif_dev->rx_lock);
612                                 goto err;
613                         }
614                         skb_reserve(nskb, 32);
615                         RX_STAT_INC(skb_allocated);
616
617                         memcpy(nskb->data, &(skb->data[chk_idx+4]),
618                                hif_dev->rx_transfer_len);
619
620                         /* Record the buffer pointer */
621                         hif_dev->remain_skb = nskb;
622                         spin_unlock(&hif_dev->rx_lock);
623                 } else {
624                         if (pool_index == MAX_PKT_NUM_IN_TRANSFER) {
625                                 dev_err(&hif_dev->udev->dev,
626                                         "ath9k_htc: over RX MAX_PKT_NUM\n");
627                                 goto err;
628                         }
629                         nskb = __dev_alloc_skb(pkt_len + 32, GFP_ATOMIC);
630                         if (!nskb) {
631                                 dev_err(&hif_dev->udev->dev,
632                                         "ath9k_htc: RX memory allocation error\n");
633                                 goto err;
634                         }
635                         skb_reserve(nskb, 32);
636                         RX_STAT_INC(skb_allocated);
637
638                         memcpy(nskb->data, &(skb->data[chk_idx+4]), pkt_len);
639                         skb_put(nskb, pkt_len);
640                         skb_pool[pool_index++] = nskb;
641                 }
642         }
643
644 err:
645         for (i = 0; i < pool_index; i++) {
646                 RX_STAT_ADD(skb_completed_bytes, skb_pool[i]->len);
647                 ath9k_htc_rx_msg(hif_dev->htc_handle, skb_pool[i],
648                                  skb_pool[i]->len, USB_WLAN_RX_PIPE);
649                 RX_STAT_INC(skb_completed);
650         }
651 }
652
653 static void ath9k_hif_usb_rx_cb(struct urb *urb)
654 {
655         struct rx_buf *rx_buf = (struct rx_buf *)urb->context;
656         struct hif_device_usb *hif_dev = rx_buf->hif_dev;
657         struct sk_buff *skb = rx_buf->skb;
658         int ret;
659
660         if (!skb)
661                 return;
662
663         if (!hif_dev)
664                 goto free;
665
666         switch (urb->status) {
667         case 0:
668                 break;
669         case -ENOENT:
670         case -ECONNRESET:
671         case -ENODEV:
672         case -ESHUTDOWN:
673                 goto free;
674         default:
675                 goto resubmit;
676         }
677
678         if (likely(urb->actual_length != 0)) {
679                 skb_put(skb, urb->actual_length);
680                 ath9k_hif_usb_rx_stream(hif_dev, skb);
681         }
682
683 resubmit:
684         skb_reset_tail_pointer(skb);
685         skb_trim(skb, 0);
686
687         usb_anchor_urb(urb, &hif_dev->rx_submitted);
688         ret = usb_submit_urb(urb, GFP_ATOMIC);
689         if (ret) {
690                 usb_unanchor_urb(urb);
691                 goto free;
692         }
693
694         return;
695 free:
696         kfree_skb(skb);
697         kfree(rx_buf);
698 }
699
700 static void ath9k_hif_usb_reg_in_cb(struct urb *urb)
701 {
702         struct rx_buf *rx_buf = (struct rx_buf *)urb->context;
703         struct hif_device_usb *hif_dev = rx_buf->hif_dev;
704         struct sk_buff *skb = rx_buf->skb;
705         struct sk_buff *nskb;
706         int ret;
707
708         if (!skb)
709                 return;
710
711         if (!hif_dev)
712                 goto free;
713
714         switch (urb->status) {
715         case 0:
716                 break;
717         case -ENOENT:
718         case -ECONNRESET:
719         case -ENODEV:
720         case -ESHUTDOWN:
721                 goto free;
722         default:
723                 skb_reset_tail_pointer(skb);
724                 skb_trim(skb, 0);
725
726                 goto resubmit;
727         }
728
729         if (likely(urb->actual_length != 0)) {
730                 skb_put(skb, urb->actual_length);
731
732                 /* Process the command first */
733                 ath9k_htc_rx_msg(hif_dev->htc_handle, skb,
734                                  skb->len, USB_REG_IN_PIPE);
735
736
737                 nskb = alloc_skb(MAX_REG_IN_BUF_SIZE, GFP_ATOMIC);
738                 if (!nskb) {
739                         dev_err(&hif_dev->udev->dev,
740                                 "ath9k_htc: REG_IN memory allocation failure\n");
741                         urb->context = NULL;
742                         return;
743                 }
744
745                 rx_buf->skb = nskb;
746
747                 usb_fill_int_urb(urb, hif_dev->udev,
748                                  usb_rcvintpipe(hif_dev->udev,
749                                                  USB_REG_IN_PIPE),
750                                  nskb->data, MAX_REG_IN_BUF_SIZE,
751                                  ath9k_hif_usb_reg_in_cb, rx_buf, 1);
752         }
753
754 resubmit:
755         usb_anchor_urb(urb, &hif_dev->reg_in_submitted);
756         ret = usb_submit_urb(urb, GFP_ATOMIC);
757         if (ret) {
758                 usb_unanchor_urb(urb);
759                 goto free;
760         }
761
762         return;
763 free:
764         kfree_skb(skb);
765         kfree(rx_buf);
766         urb->context = NULL;
767 }
768
769 static void ath9k_hif_usb_dealloc_tx_urbs(struct hif_device_usb *hif_dev)
770 {
771         struct tx_buf *tx_buf = NULL, *tx_buf_tmp = NULL;
772         unsigned long flags;
773
774         spin_lock_irqsave(&hif_dev->tx.tx_lock, flags);
775         list_for_each_entry_safe(tx_buf, tx_buf_tmp,
776                                  &hif_dev->tx.tx_buf, list) {
777                 usb_get_urb(tx_buf->urb);
778                 spin_unlock_irqrestore(&hif_dev->tx.tx_lock, flags);
779                 usb_kill_urb(tx_buf->urb);
780                 list_del(&tx_buf->list);
781                 usb_free_urb(tx_buf->urb);
782                 kfree(tx_buf->buf);
783                 kfree(tx_buf);
784                 spin_lock_irqsave(&hif_dev->tx.tx_lock, flags);
785         }
786         spin_unlock_irqrestore(&hif_dev->tx.tx_lock, flags);
787
788         spin_lock_irqsave(&hif_dev->tx.tx_lock, flags);
789         hif_dev->tx.flags |= HIF_USB_TX_FLUSH;
790         spin_unlock_irqrestore(&hif_dev->tx.tx_lock, flags);
791
792         spin_lock_irqsave(&hif_dev->tx.tx_lock, flags);
793         list_for_each_entry_safe(tx_buf, tx_buf_tmp,
794                                  &hif_dev->tx.tx_pending, list) {
795                 usb_get_urb(tx_buf->urb);
796                 spin_unlock_irqrestore(&hif_dev->tx.tx_lock, flags);
797                 usb_kill_urb(tx_buf->urb);
798                 list_del(&tx_buf->list);
799                 usb_free_urb(tx_buf->urb);
800                 kfree(tx_buf->buf);
801                 kfree(tx_buf);
802                 spin_lock_irqsave(&hif_dev->tx.tx_lock, flags);
803         }
804         spin_unlock_irqrestore(&hif_dev->tx.tx_lock, flags);
805
806         usb_kill_anchored_urbs(&hif_dev->mgmt_submitted);
807 }
808
809 static int ath9k_hif_usb_alloc_tx_urbs(struct hif_device_usb *hif_dev)
810 {
811         struct tx_buf *tx_buf;
812         int i;
813
814         INIT_LIST_HEAD(&hif_dev->tx.tx_buf);
815         INIT_LIST_HEAD(&hif_dev->tx.tx_pending);
816         spin_lock_init(&hif_dev->tx.tx_lock);
817         __skb_queue_head_init(&hif_dev->tx.tx_skb_queue);
818         init_usb_anchor(&hif_dev->mgmt_submitted);
819
820         for (i = 0; i < MAX_TX_URB_NUM; i++) {
821                 tx_buf = kzalloc(sizeof(*tx_buf), GFP_KERNEL);
822                 if (!tx_buf)
823                         goto err;
824
825                 tx_buf->buf = kzalloc(MAX_TX_BUF_SIZE, GFP_KERNEL);
826                 if (!tx_buf->buf)
827                         goto err;
828
829                 tx_buf->urb = usb_alloc_urb(0, GFP_KERNEL);
830                 if (!tx_buf->urb)
831                         goto err;
832
833                 tx_buf->hif_dev = hif_dev;
834                 __skb_queue_head_init(&tx_buf->skb_queue);
835
836                 list_add_tail(&tx_buf->list, &hif_dev->tx.tx_buf);
837         }
838
839         hif_dev->tx.tx_buf_cnt = MAX_TX_URB_NUM;
840
841         return 0;
842 err:
843         if (tx_buf) {
844                 kfree(tx_buf->buf);
845                 kfree(tx_buf);
846         }
847         ath9k_hif_usb_dealloc_tx_urbs(hif_dev);
848         return -ENOMEM;
849 }
850
851 static void ath9k_hif_usb_dealloc_rx_urbs(struct hif_device_usb *hif_dev)
852 {
853         usb_kill_anchored_urbs(&hif_dev->rx_submitted);
854 }
855
856 static int ath9k_hif_usb_alloc_rx_urbs(struct hif_device_usb *hif_dev)
857 {
858         struct rx_buf *rx_buf = NULL;
859         struct sk_buff *skb = NULL;
860         struct urb *urb = NULL;
861         int i, ret;
862
863         init_usb_anchor(&hif_dev->rx_submitted);
864         spin_lock_init(&hif_dev->rx_lock);
865
866         for (i = 0; i < MAX_RX_URB_NUM; i++) {
867
868                 rx_buf = kzalloc(sizeof(*rx_buf), GFP_KERNEL);
869                 if (!rx_buf) {
870                         ret = -ENOMEM;
871                         goto err_rxb;
872                 }
873
874                 /* Allocate URB */
875                 urb = usb_alloc_urb(0, GFP_KERNEL);
876                 if (urb == NULL) {
877                         ret = -ENOMEM;
878                         goto err_urb;
879                 }
880
881                 /* Allocate buffer */
882                 skb = alloc_skb(MAX_RX_BUF_SIZE, GFP_KERNEL);
883                 if (!skb) {
884                         ret = -ENOMEM;
885                         goto err_skb;
886                 }
887
888                 rx_buf->hif_dev = hif_dev;
889                 rx_buf->skb = skb;
890
891                 usb_fill_bulk_urb(urb, hif_dev->udev,
892                                   usb_rcvbulkpipe(hif_dev->udev,
893                                                   USB_WLAN_RX_PIPE),
894                                   skb->data, MAX_RX_BUF_SIZE,
895                                   ath9k_hif_usb_rx_cb, rx_buf);
896
897                 /* Anchor URB */
898                 usb_anchor_urb(urb, &hif_dev->rx_submitted);
899
900                 /* Submit URB */
901                 ret = usb_submit_urb(urb, GFP_KERNEL);
902                 if (ret) {
903                         usb_unanchor_urb(urb);
904                         goto err_submit;
905                 }
906
907                 /*
908                  * Drop reference count.
909                  * This ensures that the URB is freed when killing them.
910                  */
911                 usb_free_urb(urb);
912         }
913
914         return 0;
915
916 err_submit:
917         kfree_skb(skb);
918 err_skb:
919         usb_free_urb(urb);
920 err_urb:
921         kfree(rx_buf);
922 err_rxb:
923         ath9k_hif_usb_dealloc_rx_urbs(hif_dev);
924         return ret;
925 }
926
927 static void ath9k_hif_usb_dealloc_reg_in_urbs(struct hif_device_usb *hif_dev)
928 {
929         usb_kill_anchored_urbs(&hif_dev->reg_in_submitted);
930 }
931
932 static int ath9k_hif_usb_alloc_reg_in_urbs(struct hif_device_usb *hif_dev)
933 {
934         struct rx_buf *rx_buf = NULL;
935         struct sk_buff *skb = NULL;
936         struct urb *urb = NULL;
937         int i, ret;
938
939         init_usb_anchor(&hif_dev->reg_in_submitted);
940
941         for (i = 0; i < MAX_REG_IN_URB_NUM; i++) {
942
943                 rx_buf = kzalloc(sizeof(*rx_buf), GFP_KERNEL);
944                 if (!rx_buf) {
945                         ret = -ENOMEM;
946                         goto err_rxb;
947                 }
948
949                 /* Allocate URB */
950                 urb = usb_alloc_urb(0, GFP_KERNEL);
951                 if (urb == NULL) {
952                         ret = -ENOMEM;
953                         goto err_urb;
954                 }
955
956                 /* Allocate buffer */
957                 skb = alloc_skb(MAX_REG_IN_BUF_SIZE, GFP_KERNEL);
958                 if (!skb) {
959                         ret = -ENOMEM;
960                         goto err_skb;
961                 }
962
963                 rx_buf->hif_dev = hif_dev;
964                 rx_buf->skb = skb;
965
966                 usb_fill_int_urb(urb, hif_dev->udev,
967                                   usb_rcvintpipe(hif_dev->udev,
968                                                   USB_REG_IN_PIPE),
969                                   skb->data, MAX_REG_IN_BUF_SIZE,
970                                   ath9k_hif_usb_reg_in_cb, rx_buf, 1);
971
972                 /* Anchor URB */
973                 usb_anchor_urb(urb, &hif_dev->reg_in_submitted);
974
975                 /* Submit URB */
976                 ret = usb_submit_urb(urb, GFP_KERNEL);
977                 if (ret) {
978                         usb_unanchor_urb(urb);
979                         goto err_submit;
980                 }
981
982                 /*
983                  * Drop reference count.
984                  * This ensures that the URB is freed when killing them.
985                  */
986                 usb_free_urb(urb);
987         }
988
989         return 0;
990
991 err_submit:
992         kfree_skb(skb);
993 err_skb:
994         usb_free_urb(urb);
995 err_urb:
996         kfree(rx_buf);
997 err_rxb:
998         ath9k_hif_usb_dealloc_reg_in_urbs(hif_dev);
999         return ret;
1000 }
1001
1002 static int ath9k_hif_usb_alloc_urbs(struct hif_device_usb *hif_dev)
1003 {
1004         /* Register Write */
1005         init_usb_anchor(&hif_dev->regout_submitted);
1006
1007         /* TX */
1008         if (ath9k_hif_usb_alloc_tx_urbs(hif_dev) < 0)
1009                 goto err;
1010
1011         /* RX */
1012         if (ath9k_hif_usb_alloc_rx_urbs(hif_dev) < 0)
1013                 goto err_rx;
1014
1015         /* Register Read */
1016         if (ath9k_hif_usb_alloc_reg_in_urbs(hif_dev) < 0)
1017                 goto err_reg;
1018
1019         return 0;
1020 err_reg:
1021         ath9k_hif_usb_dealloc_rx_urbs(hif_dev);
1022 err_rx:
1023         ath9k_hif_usb_dealloc_tx_urbs(hif_dev);
1024 err:
1025         return -ENOMEM;
1026 }
1027
1028 void ath9k_hif_usb_dealloc_urbs(struct hif_device_usb *hif_dev)
1029 {
1030         usb_kill_anchored_urbs(&hif_dev->regout_submitted);
1031         ath9k_hif_usb_dealloc_reg_in_urbs(hif_dev);
1032         ath9k_hif_usb_dealloc_tx_urbs(hif_dev);
1033         ath9k_hif_usb_dealloc_rx_urbs(hif_dev);
1034 }
1035
1036 static int ath9k_hif_usb_download_fw(struct hif_device_usb *hif_dev)
1037 {
1038         int transfer, err;
1039         const void *data = hif_dev->fw_data;
1040         size_t len = hif_dev->fw_size;
1041         u32 addr = AR9271_FIRMWARE;
1042         u8 *buf = kzalloc(4096, GFP_KERNEL);
1043         u32 firm_offset;
1044
1045         if (!buf)
1046                 return -ENOMEM;
1047
1048         while (len) {
1049                 transfer = min_t(size_t, len, 4096);
1050                 memcpy(buf, data, transfer);
1051
1052                 err = usb_control_msg(hif_dev->udev,
1053                                       usb_sndctrlpipe(hif_dev->udev, 0),
1054                                       FIRMWARE_DOWNLOAD, 0x40 | USB_DIR_OUT,
1055                                       addr >> 8, 0, buf, transfer,
1056                                       USB_MSG_TIMEOUT);
1057                 if (err < 0) {
1058                         kfree(buf);
1059                         return err;
1060                 }
1061
1062                 len -= transfer;
1063                 data += transfer;
1064                 addr += transfer;
1065         }
1066         kfree(buf);
1067
1068         if (IS_AR7010_DEVICE(hif_dev->usb_device_id->driver_info))
1069                 firm_offset = AR7010_FIRMWARE_TEXT;
1070         else
1071                 firm_offset = AR9271_FIRMWARE_TEXT;
1072
1073         /*
1074          * Issue FW download complete command to firmware.
1075          */
1076         err = usb_control_msg(hif_dev->udev, usb_sndctrlpipe(hif_dev->udev, 0),
1077                               FIRMWARE_DOWNLOAD_COMP,
1078                               0x40 | USB_DIR_OUT,
1079                               firm_offset >> 8, 0, NULL, 0, USB_MSG_TIMEOUT);
1080         if (err)
1081                 return -EIO;
1082
1083         dev_info(&hif_dev->udev->dev, "ath9k_htc: Transferred FW: %s, size: %ld\n",
1084                  hif_dev->fw_name, (unsigned long) hif_dev->fw_size);
1085
1086         return 0;
1087 }
1088
1089 static int ath9k_hif_usb_dev_init(struct hif_device_usb *hif_dev)
1090 {
1091         int ret;
1092
1093         ret = ath9k_hif_usb_download_fw(hif_dev);
1094         if (ret) {
1095                 dev_err(&hif_dev->udev->dev,
1096                         "ath9k_htc: Firmware - %s download failed\n",
1097                         hif_dev->fw_name);
1098                 return ret;
1099         }
1100
1101         /* Alloc URBs */
1102         ret = ath9k_hif_usb_alloc_urbs(hif_dev);
1103         if (ret) {
1104                 dev_err(&hif_dev->udev->dev,
1105                         "ath9k_htc: Unable to allocate URBs\n");
1106                 return ret;
1107         }
1108
1109         return 0;
1110 }
1111
1112 static void ath9k_hif_usb_dev_deinit(struct hif_device_usb *hif_dev)
1113 {
1114         ath9k_hif_usb_dealloc_urbs(hif_dev);
1115 }
1116
1117 /*
1118  * If initialization fails or the FW cannot be retrieved,
1119  * detach the device.
1120  */
1121 static void ath9k_hif_usb_firmware_fail(struct hif_device_usb *hif_dev)
1122 {
1123         struct device *dev = &hif_dev->udev->dev;
1124         struct device *parent = dev->parent;
1125
1126         complete_all(&hif_dev->fw_done);
1127
1128         if (parent)
1129                 device_lock(parent);
1130
1131         device_release_driver(dev);
1132
1133         if (parent)
1134                 device_unlock(parent);
1135 }
1136
1137 static void ath9k_hif_usb_firmware_cb(const struct firmware *fw, void *context);
1138
1139 /* taken from iwlwifi */
1140 static int ath9k_hif_request_firmware(struct hif_device_usb *hif_dev,
1141                                       bool first)
1142 {
1143         char index[8], *chip;
1144         int ret;
1145
1146         if (first) {
1147                 if (htc_use_dev_fw) {
1148                         hif_dev->fw_minor_index = FIRMWARE_MINOR_IDX_MAX + 1;
1149                         sprintf(index, "%s", "dev");
1150                 } else {
1151                         hif_dev->fw_minor_index = FIRMWARE_MINOR_IDX_MAX;
1152                         sprintf(index, "%d", hif_dev->fw_minor_index);
1153                 }
1154         } else {
1155                 hif_dev->fw_minor_index--;
1156                 sprintf(index, "%d", hif_dev->fw_minor_index);
1157         }
1158
1159         /* test for FW 1.3 */
1160         if (MAJOR_VERSION_REQ == 1 && hif_dev->fw_minor_index == 3) {
1161                 const char *filename;
1162
1163                 if (IS_AR7010_DEVICE(hif_dev->usb_device_id->driver_info))
1164                         filename = FIRMWARE_AR7010_1_1;
1165                 else
1166                         filename = FIRMWARE_AR9271;
1167
1168                 /* expected fw locations:
1169                  * - htc_9271.fw   (stable version 1.3, depricated)
1170                  */
1171                 snprintf(hif_dev->fw_name, sizeof(hif_dev->fw_name),
1172                          "%s", filename);
1173
1174         } else if (hif_dev->fw_minor_index < FIRMWARE_MINOR_IDX_MIN) {
1175                 dev_err(&hif_dev->udev->dev, "no suitable firmware found!\n");
1176
1177                 return -ENOENT;
1178         } else {
1179                 if (IS_AR7010_DEVICE(hif_dev->usb_device_id->driver_info))
1180                         chip = "7010";
1181                 else
1182                         chip = "9271";
1183
1184                 /* expected fw locations:
1185                  * - ath9k_htc/htc_9271-1.dev.0.fw (development version)
1186                  * - ath9k_htc/htc_9271-1.4.0.fw   (stable version)
1187                  */
1188                 snprintf(hif_dev->fw_name, sizeof(hif_dev->fw_name),
1189                          "%s/htc_%s-%d.%s.0.fw", HTC_FW_PATH,
1190                          chip, MAJOR_VERSION_REQ, index);
1191         }
1192
1193         ret = request_firmware_nowait(THIS_MODULE, true, hif_dev->fw_name,
1194                                       &hif_dev->udev->dev, GFP_KERNEL,
1195                                       hif_dev, ath9k_hif_usb_firmware_cb);
1196         if (ret) {
1197                 dev_err(&hif_dev->udev->dev,
1198                         "ath9k_htc: Async request for firmware %s failed\n",
1199                         hif_dev->fw_name);
1200                 return ret;
1201         }
1202
1203         dev_info(&hif_dev->udev->dev, "ath9k_htc: Firmware %s requested\n",
1204                  hif_dev->fw_name);
1205
1206         return ret;
1207 }
1208
1209 static void ath9k_hif_usb_firmware_cb(const struct firmware *fw, void *context)
1210 {
1211         struct hif_device_usb *hif_dev = context;
1212         int ret;
1213
1214         if (!fw) {
1215                 ret = ath9k_hif_request_firmware(hif_dev, false);
1216                 if (!ret)
1217                         return;
1218
1219                 dev_err(&hif_dev->udev->dev,
1220                         "ath9k_htc: Failed to get firmware %s\n",
1221                         hif_dev->fw_name);
1222                 goto err_fw;
1223         }
1224
1225         hif_dev->htc_handle = ath9k_htc_hw_alloc(hif_dev, &hif_usb,
1226                                                  &hif_dev->udev->dev);
1227         if (hif_dev->htc_handle == NULL)
1228                 goto err_dev_alloc;
1229
1230         hif_dev->fw_data = fw->data;
1231         hif_dev->fw_size = fw->size;
1232
1233         /* Proceed with initialization */
1234
1235         ret = ath9k_hif_usb_dev_init(hif_dev);
1236         if (ret)
1237                 goto err_dev_init;
1238
1239         ret = ath9k_htc_hw_init(hif_dev->htc_handle,
1240                                 &hif_dev->interface->dev,
1241                                 hif_dev->usb_device_id->idProduct,
1242                                 hif_dev->udev->product,
1243                                 hif_dev->usb_device_id->driver_info);
1244         if (ret) {
1245                 ret = -EINVAL;
1246                 goto err_htc_hw_init;
1247         }
1248
1249         release_firmware(fw);
1250         hif_dev->flags |= HIF_USB_READY;
1251         complete_all(&hif_dev->fw_done);
1252
1253         return;
1254
1255 err_htc_hw_init:
1256         ath9k_hif_usb_dev_deinit(hif_dev);
1257 err_dev_init:
1258         ath9k_htc_hw_free(hif_dev->htc_handle);
1259 err_dev_alloc:
1260         release_firmware(fw);
1261 err_fw:
1262         ath9k_hif_usb_firmware_fail(hif_dev);
1263 }
1264
1265 /*
1266  * An exact copy of the function from zd1211rw.
1267  */
1268 static int send_eject_command(struct usb_interface *interface)
1269 {
1270         struct usb_device *udev = interface_to_usbdev(interface);
1271         struct usb_host_interface *iface_desc = interface->cur_altsetting;
1272         struct usb_endpoint_descriptor *endpoint;
1273         unsigned char *cmd;
1274         u8 bulk_out_ep;
1275         int r;
1276
1277         if (iface_desc->desc.bNumEndpoints < 2)
1278                 return -ENODEV;
1279
1280         /* Find bulk out endpoint */
1281         for (r = 1; r >= 0; r--) {
1282                 endpoint = &iface_desc->endpoint[r].desc;
1283                 if (usb_endpoint_dir_out(endpoint) &&
1284                     usb_endpoint_xfer_bulk(endpoint)) {
1285                         bulk_out_ep = endpoint->bEndpointAddress;
1286                         break;
1287                 }
1288         }
1289         if (r == -1) {
1290                 dev_err(&udev->dev,
1291                         "ath9k_htc: Could not find bulk out endpoint\n");
1292                 return -ENODEV;
1293         }
1294
1295         cmd = kzalloc(31, GFP_KERNEL);
1296         if (cmd == NULL)
1297                 return -ENODEV;
1298
1299         /* USB bulk command block */
1300         cmd[0] = 0x55;  /* bulk command signature */
1301         cmd[1] = 0x53;  /* bulk command signature */
1302         cmd[2] = 0x42;  /* bulk command signature */
1303         cmd[3] = 0x43;  /* bulk command signature */
1304         cmd[14] = 6;    /* command length */
1305
1306         cmd[15] = 0x1b; /* SCSI command: START STOP UNIT */
1307         cmd[19] = 0x2;  /* eject disc */
1308
1309         dev_info(&udev->dev, "Ejecting storage device...\n");
1310         r = usb_bulk_msg(udev, usb_sndbulkpipe(udev, bulk_out_ep),
1311                 cmd, 31, NULL, 2 * USB_MSG_TIMEOUT);
1312         kfree(cmd);
1313         if (r)
1314                 return r;
1315
1316         /* At this point, the device disconnects and reconnects with the real
1317          * ID numbers. */
1318
1319         usb_set_intfdata(interface, NULL);
1320         return 0;
1321 }
1322
1323 static int ath9k_hif_usb_probe(struct usb_interface *interface,
1324                                const struct usb_device_id *id)
1325 {
1326         struct usb_device *udev = interface_to_usbdev(interface);
1327         struct hif_device_usb *hif_dev;
1328         int ret = 0;
1329
1330         if (id->driver_info == STORAGE_DEVICE)
1331                 return send_eject_command(interface);
1332
1333         hif_dev = kzalloc(sizeof(struct hif_device_usb), GFP_KERNEL);
1334         if (!hif_dev) {
1335                 ret = -ENOMEM;
1336                 goto err_alloc;
1337         }
1338
1339         usb_get_dev(udev);
1340
1341         hif_dev->udev = udev;
1342         hif_dev->interface = interface;
1343         hif_dev->usb_device_id = id;
1344 #ifdef CONFIG_PM
1345         udev->reset_resume = 1;
1346 #endif
1347         usb_set_intfdata(interface, hif_dev);
1348
1349         init_completion(&hif_dev->fw_done);
1350
1351         ret = ath9k_hif_request_firmware(hif_dev, true);
1352         if (ret)
1353                 goto err_fw_req;
1354
1355         return ret;
1356
1357 err_fw_req:
1358         usb_set_intfdata(interface, NULL);
1359         kfree(hif_dev);
1360         usb_put_dev(udev);
1361 err_alloc:
1362         return ret;
1363 }
1364
1365 static void ath9k_hif_usb_reboot(struct usb_device *udev)
1366 {
1367         u32 reboot_cmd = 0xffffffff;
1368         void *buf;
1369         int ret;
1370
1371         buf = kmemdup(&reboot_cmd, 4, GFP_KERNEL);
1372         if (!buf)
1373                 return;
1374
1375         ret = usb_interrupt_msg(udev, usb_sndintpipe(udev, USB_REG_OUT_PIPE),
1376                            buf, 4, NULL, USB_MSG_TIMEOUT);
1377         if (ret)
1378                 dev_err(&udev->dev, "ath9k_htc: USB reboot failed\n");
1379
1380         kfree(buf);
1381 }
1382
1383 static void ath9k_hif_usb_disconnect(struct usb_interface *interface)
1384 {
1385         struct usb_device *udev = interface_to_usbdev(interface);
1386         struct hif_device_usb *hif_dev = usb_get_intfdata(interface);
1387         bool unplugged = (udev->state == USB_STATE_NOTATTACHED) ? true : false;
1388
1389         if (!hif_dev)
1390                 return;
1391
1392         wait_for_completion(&hif_dev->fw_done);
1393
1394         if (hif_dev->flags & HIF_USB_READY) {
1395                 ath9k_htc_hw_deinit(hif_dev->htc_handle, unplugged);
1396                 ath9k_hif_usb_dev_deinit(hif_dev);
1397                 ath9k_destoy_wmi(hif_dev->htc_handle->drv_priv);
1398                 ath9k_htc_hw_free(hif_dev->htc_handle);
1399         }
1400
1401         usb_set_intfdata(interface, NULL);
1402
1403         /* If firmware was loaded we should drop it
1404          * go back to first stage bootloader. */
1405         if (!unplugged && (hif_dev->flags & HIF_USB_READY))
1406                 ath9k_hif_usb_reboot(udev);
1407
1408         kfree(hif_dev);
1409         dev_info(&udev->dev, "ath9k_htc: USB layer deinitialized\n");
1410         usb_put_dev(udev);
1411 }
1412
1413 #ifdef CONFIG_PM
1414 static int ath9k_hif_usb_suspend(struct usb_interface *interface,
1415                                  pm_message_t message)
1416 {
1417         struct hif_device_usb *hif_dev = usb_get_intfdata(interface);
1418
1419         /*
1420          * The device has to be set to FULLSLEEP mode in case no
1421          * interface is up.
1422          */
1423         if (!(hif_dev->flags & HIF_USB_START))
1424                 ath9k_htc_suspend(hif_dev->htc_handle);
1425
1426         wait_for_completion(&hif_dev->fw_done);
1427
1428         if (hif_dev->flags & HIF_USB_READY)
1429                 ath9k_hif_usb_dealloc_urbs(hif_dev);
1430
1431         return 0;
1432 }
1433
1434 static int ath9k_hif_usb_resume(struct usb_interface *interface)
1435 {
1436         struct hif_device_usb *hif_dev = usb_get_intfdata(interface);
1437         struct htc_target *htc_handle = hif_dev->htc_handle;
1438         int ret;
1439         const struct firmware *fw;
1440
1441         ret = ath9k_hif_usb_alloc_urbs(hif_dev);
1442         if (ret)
1443                 return ret;
1444
1445         if (hif_dev->flags & HIF_USB_READY) {
1446                 /* request cached firmware during suspend/resume cycle */
1447                 ret = request_firmware(&fw, hif_dev->fw_name,
1448                                        &hif_dev->udev->dev);
1449                 if (ret)
1450                         goto fail_resume;
1451
1452                 hif_dev->fw_data = fw->data;
1453                 hif_dev->fw_size = fw->size;
1454                 ret = ath9k_hif_usb_download_fw(hif_dev);
1455                 release_firmware(fw);
1456                 if (ret)
1457                         goto fail_resume;
1458         } else {
1459                 ath9k_hif_usb_dealloc_urbs(hif_dev);
1460                 return -EIO;
1461         }
1462
1463         mdelay(100);
1464
1465         ret = ath9k_htc_resume(htc_handle);
1466
1467         if (ret)
1468                 goto fail_resume;
1469
1470         return 0;
1471
1472 fail_resume:
1473         ath9k_hif_usb_dealloc_urbs(hif_dev);
1474
1475         return ret;
1476 }
1477 #endif
1478
1479 static struct usb_driver ath9k_hif_usb_driver = {
1480         .name = KBUILD_MODNAME,
1481         .probe = ath9k_hif_usb_probe,
1482         .disconnect = ath9k_hif_usb_disconnect,
1483 #ifdef CONFIG_PM
1484         .suspend = ath9k_hif_usb_suspend,
1485         .resume = ath9k_hif_usb_resume,
1486         .reset_resume = ath9k_hif_usb_resume,
1487 #endif
1488         .id_table = ath9k_hif_usb_ids,
1489         .soft_unbind = 1,
1490         .disable_hub_initiated_lpm = 1,
1491 };
1492
1493 int ath9k_hif_usb_init(void)
1494 {
1495         return usb_register(&ath9k_hif_usb_driver);
1496 }
1497
1498 void ath9k_hif_usb_exit(void)
1499 {
1500         usb_deregister(&ath9k_hif_usb_driver);
1501 }