xref: /openbmc/linux/drivers/net/wireless/ath/ath6kl/usb.c (revision 4e1609c9)
1 /*
2  * Copyright (c) 2007-2011 Atheros Communications Inc.
3  * Copyright (c) 2011-2012 Qualcomm Atheros, Inc.
4  *
5  * Permission to use, copy, modify, and/or distribute this software for any
6  * purpose with or without fee is hereby granted, provided that the above
7  * copyright notice and this permission notice appear in all copies.
8  *
9  * THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL WARRANTIES
10  * WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF
11  * MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR
12  * ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES
13  * WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN
14  * ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF
15  * OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
16  */
17 
18 #include <linux/module.h>
19 #include <linux/usb.h>
20 
21 #include "debug.h"
22 #include "core.h"
23 
24 /* constants */
25 #define TX_URB_COUNT            32
26 #define RX_URB_COUNT            32
27 #define ATH6KL_USB_RX_BUFFER_SIZE  1700
28 
29 /* tx/rx pipes for usb */
30 enum ATH6KL_USB_PIPE_ID {
31 	ATH6KL_USB_PIPE_TX_CTRL = 0,
32 	ATH6KL_USB_PIPE_TX_DATA_LP,
33 	ATH6KL_USB_PIPE_TX_DATA_MP,
34 	ATH6KL_USB_PIPE_TX_DATA_HP,
35 	ATH6KL_USB_PIPE_RX_CTRL,
36 	ATH6KL_USB_PIPE_RX_DATA,
37 	ATH6KL_USB_PIPE_RX_DATA2,
38 	ATH6KL_USB_PIPE_RX_INT,
39 	ATH6KL_USB_PIPE_MAX
40 };
41 
42 #define ATH6KL_USB_PIPE_INVALID ATH6KL_USB_PIPE_MAX
43 
44 struct ath6kl_usb_pipe {
45 	struct list_head urb_list_head;
46 	struct usb_anchor urb_submitted;
47 	u32 urb_alloc;
48 	u32 urb_cnt;
49 	u32 urb_cnt_thresh;
50 	unsigned int usb_pipe_handle;
51 	u32 flags;
52 	u8 ep_address;
53 	u8 logical_pipe_num;
54 	struct ath6kl_usb *ar_usb;
55 	u16 max_packet_size;
56 	struct work_struct io_complete_work;
57 	struct sk_buff_head io_comp_queue;
58 	struct usb_endpoint_descriptor *ep_desc;
59 };
60 
61 #define ATH6KL_USB_PIPE_FLAG_TX    (1 << 0)
62 
63 /* usb device object */
64 struct ath6kl_usb {
65 	/* protects pipe->urb_list_head and  pipe->urb_cnt */
66 	spinlock_t cs_lock;
67 
68 	struct usb_device *udev;
69 	struct usb_interface *interface;
70 	struct ath6kl_usb_pipe pipes[ATH6KL_USB_PIPE_MAX];
71 	u8 *diag_cmd_buffer;
72 	u8 *diag_resp_buffer;
73 	struct ath6kl *ar;
74 };
75 
76 /* usb urb object */
77 struct ath6kl_urb_context {
78 	struct list_head link;
79 	struct ath6kl_usb_pipe *pipe;
80 	struct sk_buff *skb;
81 	struct ath6kl *ar;
82 };
83 
84 /* USB endpoint definitions */
85 #define ATH6KL_USB_EP_ADDR_APP_CTRL_IN          0x81
86 #define ATH6KL_USB_EP_ADDR_APP_DATA_IN          0x82
87 #define ATH6KL_USB_EP_ADDR_APP_DATA2_IN         0x83
88 #define ATH6KL_USB_EP_ADDR_APP_INT_IN           0x84
89 
90 #define ATH6KL_USB_EP_ADDR_APP_CTRL_OUT         0x01
91 #define ATH6KL_USB_EP_ADDR_APP_DATA_LP_OUT      0x02
92 #define ATH6KL_USB_EP_ADDR_APP_DATA_MP_OUT      0x03
93 #define ATH6KL_USB_EP_ADDR_APP_DATA_HP_OUT      0x04
94 
95 /* diagnostic command defnitions */
96 #define ATH6KL_USB_CONTROL_REQ_SEND_BMI_CMD        1
97 #define ATH6KL_USB_CONTROL_REQ_RECV_BMI_RESP       2
98 #define ATH6KL_USB_CONTROL_REQ_DIAG_CMD            3
99 #define ATH6KL_USB_CONTROL_REQ_DIAG_RESP           4
100 
101 #define ATH6KL_USB_CTRL_DIAG_CC_READ               0
102 #define ATH6KL_USB_CTRL_DIAG_CC_WRITE              1
103 
104 struct ath6kl_usb_ctrl_diag_cmd_write {
105 	__le32 cmd;
106 	__le32 address;
107 	__le32 value;
108 	__le32 _pad[1];
109 } __packed;
110 
111 struct ath6kl_usb_ctrl_diag_cmd_read {
112 	__le32 cmd;
113 	__le32 address;
114 } __packed;
115 
116 struct ath6kl_usb_ctrl_diag_resp_read {
117 	__le32 value;
118 } __packed;
119 
120 /* function declarations */
121 static void ath6kl_usb_recv_complete(struct urb *urb);
122 
123 #define ATH6KL_USB_IS_BULK_EP(attr) (((attr) & 3) == 0x02)
124 #define ATH6KL_USB_IS_INT_EP(attr)  (((attr) & 3) == 0x03)
125 #define ATH6KL_USB_IS_ISOC_EP(attr)  (((attr) & 3) == 0x01)
126 #define ATH6KL_USB_IS_DIR_IN(addr)  ((addr) & 0x80)
127 
128 /* pipe/urb operations */
129 static struct ath6kl_urb_context *
130 ath6kl_usb_alloc_urb_from_pipe(struct ath6kl_usb_pipe *pipe)
131 {
132 	struct ath6kl_urb_context *urb_context = NULL;
133 	unsigned long flags;
134 
135 	spin_lock_irqsave(&pipe->ar_usb->cs_lock, flags);
136 	if (!list_empty(&pipe->urb_list_head)) {
137 		urb_context =
138 		    list_first_entry(&pipe->urb_list_head,
139 				     struct ath6kl_urb_context, link);
140 		list_del(&urb_context->link);
141 		pipe->urb_cnt--;
142 	}
143 	spin_unlock_irqrestore(&pipe->ar_usb->cs_lock, flags);
144 
145 	return urb_context;
146 }
147 
148 static void ath6kl_usb_free_urb_to_pipe(struct ath6kl_usb_pipe *pipe,
149 					struct ath6kl_urb_context *urb_context)
150 {
151 	unsigned long flags;
152 
153 	spin_lock_irqsave(&pipe->ar_usb->cs_lock, flags);
154 	pipe->urb_cnt++;
155 
156 	list_add(&urb_context->link, &pipe->urb_list_head);
157 	spin_unlock_irqrestore(&pipe->ar_usb->cs_lock, flags);
158 }
159 
160 static void ath6kl_usb_cleanup_recv_urb(struct ath6kl_urb_context *urb_context)
161 {
162 	dev_kfree_skb(urb_context->skb);
163 	urb_context->skb = NULL;
164 
165 	ath6kl_usb_free_urb_to_pipe(urb_context->pipe, urb_context);
166 }
167 
168 static inline struct ath6kl_usb *ath6kl_usb_priv(struct ath6kl *ar)
169 {
170 	return ar->hif_priv;
171 }
172 
173 /* pipe resource allocation/cleanup */
174 static int ath6kl_usb_alloc_pipe_resources(struct ath6kl_usb_pipe *pipe,
175 					   int urb_cnt)
176 {
177 	struct ath6kl_urb_context *urb_context;
178 	int status = 0, i;
179 
180 	INIT_LIST_HEAD(&pipe->urb_list_head);
181 	init_usb_anchor(&pipe->urb_submitted);
182 
183 	for (i = 0; i < urb_cnt; i++) {
184 		urb_context = kzalloc(sizeof(struct ath6kl_urb_context),
185 				      GFP_KERNEL);
186 		if (urb_context == NULL) {
187 			status = -ENOMEM;
188 			goto fail_alloc_pipe_resources;
189 		}
190 
191 		urb_context->pipe = pipe;
192 
193 		/*
194 		 * we are only allocate the urb contexts here, the actual URB
195 		 * is allocated from the kernel as needed to do a transaction
196 		 */
197 		pipe->urb_alloc++;
198 		ath6kl_usb_free_urb_to_pipe(pipe, urb_context);
199 	}
200 
201 	ath6kl_dbg(ATH6KL_DBG_USB,
202 		   "ath6kl usb: alloc resources lpipe:%d hpipe:0x%X urbs:%d\n",
203 		   pipe->logical_pipe_num, pipe->usb_pipe_handle,
204 		   pipe->urb_alloc);
205 
206 fail_alloc_pipe_resources:
207 	return status;
208 }
209 
210 static void ath6kl_usb_free_pipe_resources(struct ath6kl_usb_pipe *pipe)
211 {
212 	struct ath6kl_urb_context *urb_context;
213 
214 	if (pipe->ar_usb == NULL) {
215 		/* nothing allocated for this pipe */
216 		return;
217 	}
218 
219 	ath6kl_dbg(ATH6KL_DBG_USB,
220 		   "ath6kl usb: free resources lpipe:%d"
221 		   "hpipe:0x%X urbs:%d avail:%d\n",
222 		   pipe->logical_pipe_num, pipe->usb_pipe_handle,
223 		   pipe->urb_alloc, pipe->urb_cnt);
224 
225 	if (pipe->urb_alloc != pipe->urb_cnt) {
226 		ath6kl_dbg(ATH6KL_DBG_USB,
227 			   "ath6kl usb: urb leak! lpipe:%d"
228 			   "hpipe:0x%X urbs:%d avail:%d\n",
229 			   pipe->logical_pipe_num, pipe->usb_pipe_handle,
230 			   pipe->urb_alloc, pipe->urb_cnt);
231 	}
232 
233 	while (true) {
234 		urb_context = ath6kl_usb_alloc_urb_from_pipe(pipe);
235 		if (urb_context == NULL)
236 			break;
237 		kfree(urb_context);
238 	}
239 
240 }
241 
242 static void ath6kl_usb_cleanup_pipe_resources(struct ath6kl_usb *ar_usb)
243 {
244 	int i;
245 
246 	for (i = 0; i < ATH6KL_USB_PIPE_MAX; i++)
247 		ath6kl_usb_free_pipe_resources(&ar_usb->pipes[i]);
248 
249 }
250 
251 static u8 ath6kl_usb_get_logical_pipe_num(struct ath6kl_usb *ar_usb,
252 					  u8 ep_address, int *urb_count)
253 {
254 	u8 pipe_num = ATH6KL_USB_PIPE_INVALID;
255 
256 	switch (ep_address) {
257 	case ATH6KL_USB_EP_ADDR_APP_CTRL_IN:
258 		pipe_num = ATH6KL_USB_PIPE_RX_CTRL;
259 		*urb_count = RX_URB_COUNT;
260 		break;
261 	case ATH6KL_USB_EP_ADDR_APP_DATA_IN:
262 		pipe_num = ATH6KL_USB_PIPE_RX_DATA;
263 		*urb_count = RX_URB_COUNT;
264 		break;
265 	case ATH6KL_USB_EP_ADDR_APP_INT_IN:
266 		pipe_num = ATH6KL_USB_PIPE_RX_INT;
267 		*urb_count = RX_URB_COUNT;
268 		break;
269 	case ATH6KL_USB_EP_ADDR_APP_DATA2_IN:
270 		pipe_num = ATH6KL_USB_PIPE_RX_DATA2;
271 		*urb_count = RX_URB_COUNT;
272 		break;
273 	case ATH6KL_USB_EP_ADDR_APP_CTRL_OUT:
274 		pipe_num = ATH6KL_USB_PIPE_TX_CTRL;
275 		*urb_count = TX_URB_COUNT;
276 		break;
277 	case ATH6KL_USB_EP_ADDR_APP_DATA_LP_OUT:
278 		pipe_num = ATH6KL_USB_PIPE_TX_DATA_LP;
279 		*urb_count = TX_URB_COUNT;
280 		break;
281 	case ATH6KL_USB_EP_ADDR_APP_DATA_MP_OUT:
282 		pipe_num = ATH6KL_USB_PIPE_TX_DATA_MP;
283 		*urb_count = TX_URB_COUNT;
284 		break;
285 	case ATH6KL_USB_EP_ADDR_APP_DATA_HP_OUT:
286 		pipe_num = ATH6KL_USB_PIPE_TX_DATA_HP;
287 		*urb_count = TX_URB_COUNT;
288 		break;
289 	default:
290 		/* note: there may be endpoints not currently used */
291 		break;
292 	}
293 
294 	return pipe_num;
295 }
296 
297 static int ath6kl_usb_setup_pipe_resources(struct ath6kl_usb *ar_usb)
298 {
299 	struct usb_interface *interface = ar_usb->interface;
300 	struct usb_host_interface *iface_desc = interface->cur_altsetting;
301 	struct usb_endpoint_descriptor *endpoint;
302 	struct ath6kl_usb_pipe *pipe;
303 	int i, urbcount, status = 0;
304 	u8 pipe_num;
305 
306 	ath6kl_dbg(ATH6KL_DBG_USB, "setting up USB Pipes using interface\n");
307 
308 	/* walk decriptors and setup pipes */
309 	for (i = 0; i < iface_desc->desc.bNumEndpoints; ++i) {
310 		endpoint = &iface_desc->endpoint[i].desc;
311 
312 		if (ATH6KL_USB_IS_BULK_EP(endpoint->bmAttributes)) {
313 			ath6kl_dbg(ATH6KL_DBG_USB,
314 				   "%s Bulk Ep:0x%2.2X maxpktsz:%d\n",
315 				   ATH6KL_USB_IS_DIR_IN
316 				   (endpoint->bEndpointAddress) ?
317 				   "RX" : "TX", endpoint->bEndpointAddress,
318 				   le16_to_cpu(endpoint->wMaxPacketSize));
319 		} else if (ATH6KL_USB_IS_INT_EP(endpoint->bmAttributes)) {
320 			ath6kl_dbg(ATH6KL_DBG_USB,
321 				   "%s Int Ep:0x%2.2X maxpktsz:%d interval:%d\n",
322 				   ATH6KL_USB_IS_DIR_IN
323 				   (endpoint->bEndpointAddress) ?
324 				   "RX" : "TX", endpoint->bEndpointAddress,
325 				   le16_to_cpu(endpoint->wMaxPacketSize),
326 				   endpoint->bInterval);
327 		} else if (ATH6KL_USB_IS_ISOC_EP(endpoint->bmAttributes)) {
328 			/* TODO for ISO */
329 			ath6kl_dbg(ATH6KL_DBG_USB,
330 				   "%s ISOC Ep:0x%2.2X maxpktsz:%d interval:%d\n",
331 				   ATH6KL_USB_IS_DIR_IN
332 				   (endpoint->bEndpointAddress) ?
333 				   "RX" : "TX", endpoint->bEndpointAddress,
334 				   le16_to_cpu(endpoint->wMaxPacketSize),
335 				   endpoint->bInterval);
336 		}
337 		urbcount = 0;
338 
339 		pipe_num =
340 		    ath6kl_usb_get_logical_pipe_num(ar_usb,
341 						    endpoint->bEndpointAddress,
342 						    &urbcount);
343 		if (pipe_num == ATH6KL_USB_PIPE_INVALID)
344 			continue;
345 
346 		pipe = &ar_usb->pipes[pipe_num];
347 		if (pipe->ar_usb != NULL) {
348 			/* hmmm..pipe was already setup */
349 			continue;
350 		}
351 
352 		pipe->ar_usb = ar_usb;
353 		pipe->logical_pipe_num = pipe_num;
354 		pipe->ep_address = endpoint->bEndpointAddress;
355 		pipe->max_packet_size = le16_to_cpu(endpoint->wMaxPacketSize);
356 
357 		if (ATH6KL_USB_IS_BULK_EP(endpoint->bmAttributes)) {
358 			if (ATH6KL_USB_IS_DIR_IN(pipe->ep_address)) {
359 				pipe->usb_pipe_handle =
360 				    usb_rcvbulkpipe(ar_usb->udev,
361 						    pipe->ep_address);
362 			} else {
363 				pipe->usb_pipe_handle =
364 				    usb_sndbulkpipe(ar_usb->udev,
365 						    pipe->ep_address);
366 			}
367 		} else if (ATH6KL_USB_IS_INT_EP(endpoint->bmAttributes)) {
368 			if (ATH6KL_USB_IS_DIR_IN(pipe->ep_address)) {
369 				pipe->usb_pipe_handle =
370 				    usb_rcvintpipe(ar_usb->udev,
371 						   pipe->ep_address);
372 			} else {
373 				pipe->usb_pipe_handle =
374 				    usb_sndintpipe(ar_usb->udev,
375 						   pipe->ep_address);
376 			}
377 		} else if (ATH6KL_USB_IS_ISOC_EP(endpoint->bmAttributes)) {
378 			/* TODO for ISO */
379 			if (ATH6KL_USB_IS_DIR_IN(pipe->ep_address)) {
380 				pipe->usb_pipe_handle =
381 				    usb_rcvisocpipe(ar_usb->udev,
382 						    pipe->ep_address);
383 			} else {
384 				pipe->usb_pipe_handle =
385 				    usb_sndisocpipe(ar_usb->udev,
386 						    pipe->ep_address);
387 			}
388 		}
389 
390 		pipe->ep_desc = endpoint;
391 
392 		if (!ATH6KL_USB_IS_DIR_IN(pipe->ep_address))
393 			pipe->flags |= ATH6KL_USB_PIPE_FLAG_TX;
394 
395 		status = ath6kl_usb_alloc_pipe_resources(pipe, urbcount);
396 		if (status != 0)
397 			break;
398 	}
399 
400 	return status;
401 }
402 
403 /* pipe operations */
404 static void ath6kl_usb_post_recv_transfers(struct ath6kl_usb_pipe *recv_pipe,
405 					   int buffer_length)
406 {
407 	struct ath6kl_urb_context *urb_context;
408 	struct urb *urb;
409 	int usb_status;
410 
411 	while (true) {
412 		urb_context = ath6kl_usb_alloc_urb_from_pipe(recv_pipe);
413 		if (urb_context == NULL)
414 			break;
415 
416 		urb_context->skb = dev_alloc_skb(buffer_length);
417 		if (urb_context->skb == NULL)
418 			goto err_cleanup_urb;
419 
420 		urb = usb_alloc_urb(0, GFP_ATOMIC);
421 		if (urb == NULL)
422 			goto err_cleanup_urb;
423 
424 		usb_fill_bulk_urb(urb,
425 				  recv_pipe->ar_usb->udev,
426 				  recv_pipe->usb_pipe_handle,
427 				  urb_context->skb->data,
428 				  buffer_length,
429 				  ath6kl_usb_recv_complete, urb_context);
430 
431 		ath6kl_dbg(ATH6KL_DBG_USB_BULK,
432 			   "ath6kl usb: bulk recv submit:%d, 0x%X (ep:0x%2.2X), %d bytes buf:0x%p\n",
433 			   recv_pipe->logical_pipe_num,
434 			   recv_pipe->usb_pipe_handle, recv_pipe->ep_address,
435 			   buffer_length, urb_context->skb);
436 
437 		usb_anchor_urb(urb, &recv_pipe->urb_submitted);
438 		usb_status = usb_submit_urb(urb, GFP_ATOMIC);
439 
440 		if (usb_status) {
441 			ath6kl_dbg(ATH6KL_DBG_USB_BULK,
442 				   "ath6kl usb : usb bulk recv failed %d\n",
443 				   usb_status);
444 			usb_unanchor_urb(urb);
445 			usb_free_urb(urb);
446 			goto err_cleanup_urb;
447 		}
448 		usb_free_urb(urb);
449 	}
450 	return;
451 
452 err_cleanup_urb:
453 	ath6kl_usb_cleanup_recv_urb(urb_context);
454 	return;
455 }
456 
457 static void ath6kl_usb_flush_all(struct ath6kl_usb *ar_usb)
458 {
459 	int i;
460 
461 	for (i = 0; i < ATH6KL_USB_PIPE_MAX; i++) {
462 		if (ar_usb->pipes[i].ar_usb != NULL)
463 			usb_kill_anchored_urbs(&ar_usb->pipes[i].urb_submitted);
464 	}
465 
466 	/*
467 	 * Flushing any pending I/O may schedule work this call will block
468 	 * until all scheduled work runs to completion.
469 	 */
470 	flush_scheduled_work();
471 }
472 
473 static void ath6kl_usb_start_recv_pipes(struct ath6kl_usb *ar_usb)
474 {
475 	/*
476 	 * note: control pipe is no longer used
477 	 * ar_usb->pipes[ATH6KL_USB_PIPE_RX_CTRL].urb_cnt_thresh =
478 	 *      ar_usb->pipes[ATH6KL_USB_PIPE_RX_CTRL].urb_alloc/2;
479 	 * ath6kl_usb_post_recv_transfers(&ar_usb->
480 	 *		pipes[ATH6KL_USB_PIPE_RX_CTRL],
481 	 *		ATH6KL_USB_RX_BUFFER_SIZE);
482 	 */
483 
484 	ar_usb->pipes[ATH6KL_USB_PIPE_RX_DATA].urb_cnt_thresh =
485 	    ar_usb->pipes[ATH6KL_USB_PIPE_RX_DATA].urb_alloc / 2;
486 	ath6kl_usb_post_recv_transfers(&ar_usb->pipes[ATH6KL_USB_PIPE_RX_DATA],
487 				       ATH6KL_USB_RX_BUFFER_SIZE);
488 }
489 
490 /* hif usb rx/tx completion functions */
491 static void ath6kl_usb_recv_complete(struct urb *urb)
492 {
493 	struct ath6kl_urb_context *urb_context = urb->context;
494 	struct ath6kl_usb_pipe *pipe = urb_context->pipe;
495 	struct sk_buff *skb = NULL;
496 	int status = 0;
497 
498 	ath6kl_dbg(ATH6KL_DBG_USB_BULK,
499 		   "%s: recv pipe: %d, stat:%d, len:%d urb:0x%p\n", __func__,
500 		   pipe->logical_pipe_num, urb->status, urb->actual_length,
501 		   urb);
502 
503 	if (urb->status != 0) {
504 		status = -EIO;
505 		switch (urb->status) {
506 		case -ECONNRESET:
507 		case -ENOENT:
508 		case -ESHUTDOWN:
509 			/*
510 			 * no need to spew these errors when device
511 			 * removed or urb killed due to driver shutdown
512 			 */
513 			status = -ECANCELED;
514 			break;
515 		default:
516 			ath6kl_dbg(ATH6KL_DBG_USB_BULK,
517 				   "%s recv pipe: %d (ep:0x%2.2X), failed:%d\n",
518 				   __func__, pipe->logical_pipe_num,
519 				   pipe->ep_address, urb->status);
520 			break;
521 		}
522 		goto cleanup_recv_urb;
523 	}
524 
525 	if (urb->actual_length == 0)
526 		goto cleanup_recv_urb;
527 
528 	skb = urb_context->skb;
529 
530 	/* we are going to pass it up */
531 	urb_context->skb = NULL;
532 	skb_put(skb, urb->actual_length);
533 
534 	/* note: queue implements a lock */
535 	skb_queue_tail(&pipe->io_comp_queue, skb);
536 	schedule_work(&pipe->io_complete_work);
537 
538 cleanup_recv_urb:
539 	ath6kl_usb_cleanup_recv_urb(urb_context);
540 
541 	if (status == 0 &&
542 	    pipe->urb_cnt >= pipe->urb_cnt_thresh) {
543 		/* our free urbs are piling up, post more transfers */
544 		ath6kl_usb_post_recv_transfers(pipe, ATH6KL_USB_RX_BUFFER_SIZE);
545 	}
546 }
547 
548 static void ath6kl_usb_usb_transmit_complete(struct urb *urb)
549 {
550 	struct ath6kl_urb_context *urb_context = urb->context;
551 	struct ath6kl_usb_pipe *pipe = urb_context->pipe;
552 	struct sk_buff *skb;
553 
554 	ath6kl_dbg(ATH6KL_DBG_USB_BULK,
555 		   "%s: pipe: %d, stat:%d, len:%d\n",
556 		   __func__, pipe->logical_pipe_num, urb->status,
557 		   urb->actual_length);
558 
559 	if (urb->status != 0) {
560 		ath6kl_dbg(ATH6KL_DBG_USB_BULK,
561 			   "%s:  pipe: %d, failed:%d\n",
562 			   __func__, pipe->logical_pipe_num, urb->status);
563 	}
564 
565 	skb = urb_context->skb;
566 	urb_context->skb = NULL;
567 	ath6kl_usb_free_urb_to_pipe(urb_context->pipe, urb_context);
568 
569 	/* note: queue implements a lock */
570 	skb_queue_tail(&pipe->io_comp_queue, skb);
571 	schedule_work(&pipe->io_complete_work);
572 }
573 
574 static void ath6kl_usb_io_comp_work(struct work_struct *work)
575 {
576 	struct ath6kl_usb_pipe *pipe = container_of(work,
577 						    struct ath6kl_usb_pipe,
578 						    io_complete_work);
579 	struct ath6kl_usb *ar_usb;
580 	struct sk_buff *skb;
581 
582 	ar_usb = pipe->ar_usb;
583 
584 	while ((skb = skb_dequeue(&pipe->io_comp_queue))) {
585 		if (pipe->flags & ATH6KL_USB_PIPE_FLAG_TX) {
586 			ath6kl_dbg(ATH6KL_DBG_USB_BULK,
587 				   "ath6kl usb xmit callback buf:0x%p\n", skb);
588 			ath6kl_core_tx_complete(ar_usb->ar, skb);
589 		} else {
590 			ath6kl_dbg(ATH6KL_DBG_USB_BULK,
591 				   "ath6kl usb recv callback buf:0x%p\n", skb);
592 			ath6kl_core_rx_complete(ar_usb->ar, skb,
593 						pipe->logical_pipe_num);
594 		}
595 	}
596 }
597 
598 #define ATH6KL_USB_MAX_DIAG_CMD (sizeof(struct ath6kl_usb_ctrl_diag_cmd_write))
599 #define ATH6KL_USB_MAX_DIAG_RESP (sizeof(struct ath6kl_usb_ctrl_diag_resp_read))
600 
601 static void ath6kl_usb_destroy(struct ath6kl_usb *ar_usb)
602 {
603 	ath6kl_usb_flush_all(ar_usb);
604 
605 	ath6kl_usb_cleanup_pipe_resources(ar_usb);
606 
607 	usb_set_intfdata(ar_usb->interface, NULL);
608 
609 	kfree(ar_usb->diag_cmd_buffer);
610 	kfree(ar_usb->diag_resp_buffer);
611 
612 	kfree(ar_usb);
613 }
614 
615 static struct ath6kl_usb *ath6kl_usb_create(struct usb_interface *interface)
616 {
617 	struct usb_device *dev = interface_to_usbdev(interface);
618 	struct ath6kl_usb *ar_usb;
619 	struct ath6kl_usb_pipe *pipe;
620 	int status = 0;
621 	int i;
622 
623 	ar_usb = kzalloc(sizeof(struct ath6kl_usb), GFP_KERNEL);
624 	if (ar_usb == NULL)
625 		goto fail_ath6kl_usb_create;
626 
627 	usb_set_intfdata(interface, ar_usb);
628 	spin_lock_init(&(ar_usb->cs_lock));
629 	ar_usb->udev = dev;
630 	ar_usb->interface = interface;
631 
632 	for (i = 0; i < ATH6KL_USB_PIPE_MAX; i++) {
633 		pipe = &ar_usb->pipes[i];
634 		INIT_WORK(&pipe->io_complete_work,
635 			  ath6kl_usb_io_comp_work);
636 		skb_queue_head_init(&pipe->io_comp_queue);
637 	}
638 
639 	ar_usb->diag_cmd_buffer = kzalloc(ATH6KL_USB_MAX_DIAG_CMD, GFP_KERNEL);
640 	if (ar_usb->diag_cmd_buffer == NULL) {
641 		status = -ENOMEM;
642 		goto fail_ath6kl_usb_create;
643 	}
644 
645 	ar_usb->diag_resp_buffer = kzalloc(ATH6KL_USB_MAX_DIAG_RESP,
646 					   GFP_KERNEL);
647 	if (ar_usb->diag_resp_buffer == NULL) {
648 		status = -ENOMEM;
649 		goto fail_ath6kl_usb_create;
650 	}
651 
652 	status = ath6kl_usb_setup_pipe_resources(ar_usb);
653 
654 fail_ath6kl_usb_create:
655 	if (status != 0) {
656 		ath6kl_usb_destroy(ar_usb);
657 		ar_usb = NULL;
658 	}
659 	return ar_usb;
660 }
661 
662 static void ath6kl_usb_device_detached(struct usb_interface *interface)
663 {
664 	struct ath6kl_usb *ar_usb;
665 
666 	ar_usb = usb_get_intfdata(interface);
667 	if (ar_usb == NULL)
668 		return;
669 
670 	ath6kl_stop_txrx(ar_usb->ar);
671 
672 	/* Delay to wait for the target to reboot */
673 	mdelay(20);
674 	ath6kl_core_cleanup(ar_usb->ar);
675 	ath6kl_usb_destroy(ar_usb);
676 }
677 
678 /* exported hif usb APIs for htc pipe */
679 static void hif_start(struct ath6kl *ar)
680 {
681 	struct ath6kl_usb *device = ath6kl_usb_priv(ar);
682 	int i;
683 
684 	ath6kl_usb_start_recv_pipes(device);
685 
686 	/* set the TX resource avail threshold for each TX pipe */
687 	for (i = ATH6KL_USB_PIPE_TX_CTRL;
688 	     i <= ATH6KL_USB_PIPE_TX_DATA_HP; i++) {
689 		device->pipes[i].urb_cnt_thresh =
690 		    device->pipes[i].urb_alloc / 2;
691 	}
692 }
693 
694 static int ath6kl_usb_send(struct ath6kl *ar, u8 PipeID,
695 			   struct sk_buff *hdr_skb, struct sk_buff *skb)
696 {
697 	struct ath6kl_usb *device = ath6kl_usb_priv(ar);
698 	struct ath6kl_usb_pipe *pipe = &device->pipes[PipeID];
699 	struct ath6kl_urb_context *urb_context;
700 	int usb_status, status = 0;
701 	struct urb *urb;
702 	u8 *data;
703 	u32 len;
704 
705 	ath6kl_dbg(ATH6KL_DBG_USB_BULK, "+%s pipe : %d, buf:0x%p\n",
706 		   __func__, PipeID, skb);
707 
708 	urb_context = ath6kl_usb_alloc_urb_from_pipe(pipe);
709 
710 	if (urb_context == NULL) {
711 		/*
712 		 * TODO: it is possible to run out of urbs if
713 		 * 2 endpoints map to the same pipe ID
714 		 */
715 		ath6kl_dbg(ATH6KL_DBG_USB_BULK,
716 			   "%s pipe:%d no urbs left. URB Cnt : %d\n",
717 			   __func__, PipeID, pipe->urb_cnt);
718 		status = -ENOMEM;
719 		goto fail_hif_send;
720 	}
721 
722 	urb_context->skb = skb;
723 
724 	data = skb->data;
725 	len = skb->len;
726 
727 	urb = usb_alloc_urb(0, GFP_ATOMIC);
728 	if (urb == NULL) {
729 		status = -ENOMEM;
730 		ath6kl_usb_free_urb_to_pipe(urb_context->pipe,
731 					    urb_context);
732 		goto fail_hif_send;
733 	}
734 
735 	usb_fill_bulk_urb(urb,
736 			  device->udev,
737 			  pipe->usb_pipe_handle,
738 			  data,
739 			  len,
740 			  ath6kl_usb_usb_transmit_complete, urb_context);
741 
742 	if ((len % pipe->max_packet_size) == 0) {
743 		/* hit a max packet boundary on this pipe */
744 		urb->transfer_flags |= URB_ZERO_PACKET;
745 	}
746 
747 	ath6kl_dbg(ATH6KL_DBG_USB_BULK,
748 		   "athusb bulk send submit:%d, 0x%X (ep:0x%2.2X), %d bytes\n",
749 		   pipe->logical_pipe_num, pipe->usb_pipe_handle,
750 		   pipe->ep_address, len);
751 
752 	usb_anchor_urb(urb, &pipe->urb_submitted);
753 	usb_status = usb_submit_urb(urb, GFP_ATOMIC);
754 
755 	if (usb_status) {
756 		ath6kl_dbg(ATH6KL_DBG_USB_BULK,
757 			   "ath6kl usb : usb bulk transmit failed %d\n",
758 			   usb_status);
759 		usb_unanchor_urb(urb);
760 		ath6kl_usb_free_urb_to_pipe(urb_context->pipe,
761 					    urb_context);
762 		status = -EINVAL;
763 	}
764 	usb_free_urb(urb);
765 
766 fail_hif_send:
767 	return status;
768 }
769 
770 static void hif_stop(struct ath6kl *ar)
771 {
772 	struct ath6kl_usb *device = ath6kl_usb_priv(ar);
773 
774 	ath6kl_usb_flush_all(device);
775 }
776 
777 static void ath6kl_usb_get_default_pipe(struct ath6kl *ar,
778 					u8 *ul_pipe, u8 *dl_pipe)
779 {
780 	*ul_pipe = ATH6KL_USB_PIPE_TX_CTRL;
781 	*dl_pipe = ATH6KL_USB_PIPE_RX_CTRL;
782 }
783 
784 static int ath6kl_usb_map_service_pipe(struct ath6kl *ar, u16 svc_id,
785 				       u8 *ul_pipe, u8 *dl_pipe)
786 {
787 	int status = 0;
788 
789 	switch (svc_id) {
790 	case HTC_CTRL_RSVD_SVC:
791 	case WMI_CONTROL_SVC:
792 		*ul_pipe = ATH6KL_USB_PIPE_TX_CTRL;
793 		/* due to large control packets, shift to data pipe */
794 		*dl_pipe = ATH6KL_USB_PIPE_RX_DATA;
795 		break;
796 	case WMI_DATA_BE_SVC:
797 	case WMI_DATA_BK_SVC:
798 		*ul_pipe = ATH6KL_USB_PIPE_TX_DATA_LP;
799 		/*
800 		* Disable rxdata2 directly, it will be enabled
801 		* if FW enable rxdata2
802 		*/
803 		*dl_pipe = ATH6KL_USB_PIPE_RX_DATA;
804 		break;
805 	case WMI_DATA_VI_SVC:
806 
807 		if (ar->hw.flags & ATH6KL_HW_MAP_LP_ENDPOINT)
808 			*ul_pipe = ATH6KL_USB_PIPE_TX_DATA_LP;
809 		else
810 			*ul_pipe = ATH6KL_USB_PIPE_TX_DATA_MP;
811 		/*
812 		* Disable rxdata2 directly, it will be enabled
813 		* if FW enable rxdata2
814 		*/
815 		*dl_pipe = ATH6KL_USB_PIPE_RX_DATA;
816 		break;
817 	case WMI_DATA_VO_SVC:
818 
819 		if (ar->hw.flags & ATH6KL_HW_MAP_LP_ENDPOINT)
820 			*ul_pipe = ATH6KL_USB_PIPE_TX_DATA_LP;
821 		else
822 			*ul_pipe = ATH6KL_USB_PIPE_TX_DATA_MP;
823 		/*
824 		* Disable rxdata2 directly, it will be enabled
825 		* if FW enable rxdata2
826 		*/
827 		*dl_pipe = ATH6KL_USB_PIPE_RX_DATA;
828 		break;
829 	default:
830 		status = -EPERM;
831 		break;
832 	}
833 
834 	return status;
835 }
836 
837 static u16 ath6kl_usb_get_free_queue_number(struct ath6kl *ar, u8 pipe_id)
838 {
839 	struct ath6kl_usb *device = ath6kl_usb_priv(ar);
840 
841 	return device->pipes[pipe_id].urb_cnt;
842 }
843 
844 static void hif_detach_htc(struct ath6kl *ar)
845 {
846 	struct ath6kl_usb *device = ath6kl_usb_priv(ar);
847 
848 	ath6kl_usb_flush_all(device);
849 }
850 
851 static int ath6kl_usb_submit_ctrl_out(struct ath6kl_usb *ar_usb,
852 				   u8 req, u16 value, u16 index, void *data,
853 				   u32 size)
854 {
855 	u8 *buf = NULL;
856 	int ret;
857 
858 	if (size > 0) {
859 		buf = kmalloc(size, GFP_KERNEL);
860 		if (buf == NULL)
861 			return -ENOMEM;
862 
863 		memcpy(buf, data, size);
864 	}
865 
866 	/* note: if successful returns number of bytes transfered */
867 	ret = usb_control_msg(ar_usb->udev,
868 			      usb_sndctrlpipe(ar_usb->udev, 0),
869 			      req,
870 			      USB_DIR_OUT | USB_TYPE_VENDOR |
871 			      USB_RECIP_DEVICE, value, index, buf,
872 			      size, 1000);
873 
874 	if (ret < 0) {
875 		ath6kl_warn("Failed to submit usb control message: %d\n", ret);
876 		kfree(buf);
877 		return ret;
878 	}
879 
880 	kfree(buf);
881 
882 	return 0;
883 }
884 
885 static int ath6kl_usb_submit_ctrl_in(struct ath6kl_usb *ar_usb,
886 				  u8 req, u16 value, u16 index, void *data,
887 				  u32 size)
888 {
889 	u8 *buf = NULL;
890 	int ret;
891 
892 	if (size > 0) {
893 		buf = kmalloc(size, GFP_KERNEL);
894 		if (buf == NULL)
895 			return -ENOMEM;
896 	}
897 
898 	/* note: if successful returns number of bytes transfered */
899 	ret = usb_control_msg(ar_usb->udev,
900 				 usb_rcvctrlpipe(ar_usb->udev, 0),
901 				 req,
902 				 USB_DIR_IN | USB_TYPE_VENDOR |
903 				 USB_RECIP_DEVICE, value, index, buf,
904 				 size, 2 * HZ);
905 
906 	if (ret < 0) {
907 		ath6kl_warn("Failed to read usb control message: %d\n", ret);
908 		kfree(buf);
909 		return ret;
910 	}
911 
912 	memcpy((u8 *) data, buf, size);
913 
914 	kfree(buf);
915 
916 	return 0;
917 }
918 
919 static int ath6kl_usb_ctrl_msg_exchange(struct ath6kl_usb *ar_usb,
920 				     u8 req_val, u8 *req_buf, u32 req_len,
921 				     u8 resp_val, u8 *resp_buf, u32 *resp_len)
922 {
923 	int ret;
924 
925 	/* send command */
926 	ret = ath6kl_usb_submit_ctrl_out(ar_usb, req_val, 0, 0,
927 					 req_buf, req_len);
928 
929 	if (ret != 0)
930 		return ret;
931 
932 	if (resp_buf == NULL) {
933 		/* no expected response */
934 		return ret;
935 	}
936 
937 	/* get response */
938 	ret = ath6kl_usb_submit_ctrl_in(ar_usb, resp_val, 0, 0,
939 					resp_buf, *resp_len);
940 
941 	return ret;
942 }
943 
944 static int ath6kl_usb_diag_read32(struct ath6kl *ar, u32 address, u32 *data)
945 {
946 	struct ath6kl_usb *ar_usb = ar->hif_priv;
947 	struct ath6kl_usb_ctrl_diag_resp_read *resp;
948 	struct ath6kl_usb_ctrl_diag_cmd_read *cmd;
949 	u32 resp_len;
950 	int ret;
951 
952 	cmd = (struct ath6kl_usb_ctrl_diag_cmd_read *) ar_usb->diag_cmd_buffer;
953 
954 	memset(cmd, 0, sizeof(*cmd));
955 	cmd->cmd = ATH6KL_USB_CTRL_DIAG_CC_READ;
956 	cmd->address = cpu_to_le32(address);
957 	resp_len = sizeof(*resp);
958 
959 	ret = ath6kl_usb_ctrl_msg_exchange(ar_usb,
960 				ATH6KL_USB_CONTROL_REQ_DIAG_CMD,
961 				(u8 *) cmd,
962 				sizeof(struct ath6kl_usb_ctrl_diag_cmd_write),
963 				ATH6KL_USB_CONTROL_REQ_DIAG_RESP,
964 				ar_usb->diag_resp_buffer, &resp_len);
965 
966 	if (ret) {
967 		ath6kl_warn("diag read32 failed: %d\n", ret);
968 		return ret;
969 	}
970 
971 	resp = (struct ath6kl_usb_ctrl_diag_resp_read *)
972 		ar_usb->diag_resp_buffer;
973 
974 	*data = le32_to_cpu(resp->value);
975 
976 	return ret;
977 }
978 
979 static int ath6kl_usb_diag_write32(struct ath6kl *ar, u32 address, __le32 data)
980 {
981 	struct ath6kl_usb *ar_usb = ar->hif_priv;
982 	struct ath6kl_usb_ctrl_diag_cmd_write *cmd;
983 	int ret;
984 
985 	cmd = (struct ath6kl_usb_ctrl_diag_cmd_write *) ar_usb->diag_cmd_buffer;
986 
987 	memset(cmd, 0, sizeof(struct ath6kl_usb_ctrl_diag_cmd_write));
988 	cmd->cmd = cpu_to_le32(ATH6KL_USB_CTRL_DIAG_CC_WRITE);
989 	cmd->address = cpu_to_le32(address);
990 	cmd->value = data;
991 
992 	ret = ath6kl_usb_ctrl_msg_exchange(ar_usb,
993 					   ATH6KL_USB_CONTROL_REQ_DIAG_CMD,
994 					   (u8 *) cmd,
995 					   sizeof(*cmd),
996 					   0, NULL, NULL);
997 	if (ret) {
998 		ath6kl_warn("diag_write32 failed: %d\n", ret);
999 		return ret;
1000 	}
1001 
1002 	return 0;
1003 }
1004 
1005 static int ath6kl_usb_bmi_read(struct ath6kl *ar, u8 *buf, u32 len)
1006 {
1007 	struct ath6kl_usb *ar_usb = ar->hif_priv;
1008 	int ret;
1009 
1010 	/* get response */
1011 	ret = ath6kl_usb_submit_ctrl_in(ar_usb,
1012 					ATH6KL_USB_CONTROL_REQ_RECV_BMI_RESP,
1013 					0, 0, buf, len);
1014 	if (ret) {
1015 		ath6kl_err("Unable to read the bmi data from the device: %d\n",
1016 			   ret);
1017 		return ret;
1018 	}
1019 
1020 	return 0;
1021 }
1022 
1023 static int ath6kl_usb_bmi_write(struct ath6kl *ar, u8 *buf, u32 len)
1024 {
1025 	struct ath6kl_usb *ar_usb = ar->hif_priv;
1026 	int ret;
1027 
1028 	/* send command */
1029 	ret = ath6kl_usb_submit_ctrl_out(ar_usb,
1030 					 ATH6KL_USB_CONTROL_REQ_SEND_BMI_CMD,
1031 					 0, 0, buf, len);
1032 	if (ret) {
1033 		ath6kl_err("unable to send the bmi data to the device: %d\n",
1034 			   ret);
1035 		return ret;
1036 	}
1037 
1038 	return 0;
1039 }
1040 
1041 static int ath6kl_usb_power_on(struct ath6kl *ar)
1042 {
1043 	hif_start(ar);
1044 	return 0;
1045 }
1046 
1047 static int ath6kl_usb_power_off(struct ath6kl *ar)
1048 {
1049 	hif_detach_htc(ar);
1050 	return 0;
1051 }
1052 
1053 static void ath6kl_usb_stop(struct ath6kl *ar)
1054 {
1055 	hif_stop(ar);
1056 }
1057 
1058 static void ath6kl_usb_cleanup_scatter(struct ath6kl *ar)
1059 {
1060 	/*
1061 	 * USB doesn't support it. Just return.
1062 	 */
1063 	return;
1064 }
1065 
1066 static const struct ath6kl_hif_ops ath6kl_usb_ops = {
1067 	.diag_read32 = ath6kl_usb_diag_read32,
1068 	.diag_write32 = ath6kl_usb_diag_write32,
1069 	.bmi_read = ath6kl_usb_bmi_read,
1070 	.bmi_write = ath6kl_usb_bmi_write,
1071 	.power_on = ath6kl_usb_power_on,
1072 	.power_off = ath6kl_usb_power_off,
1073 	.stop = ath6kl_usb_stop,
1074 	.pipe_send = ath6kl_usb_send,
1075 	.pipe_get_default = ath6kl_usb_get_default_pipe,
1076 	.pipe_map_service = ath6kl_usb_map_service_pipe,
1077 	.pipe_get_free_queue_number = ath6kl_usb_get_free_queue_number,
1078 	.cleanup_scatter = ath6kl_usb_cleanup_scatter,
1079 };
1080 
1081 /* ath6kl usb driver registered functions */
1082 static int ath6kl_usb_probe(struct usb_interface *interface,
1083 			    const struct usb_device_id *id)
1084 {
1085 	struct usb_device *dev = interface_to_usbdev(interface);
1086 	struct ath6kl *ar;
1087 	struct ath6kl_usb *ar_usb = NULL;
1088 	int vendor_id, product_id;
1089 	int ret = 0;
1090 
1091 	usb_get_dev(dev);
1092 
1093 	vendor_id = le16_to_cpu(dev->descriptor.idVendor);
1094 	product_id = le16_to_cpu(dev->descriptor.idProduct);
1095 
1096 	ath6kl_dbg(ATH6KL_DBG_USB, "vendor_id = %04x\n", vendor_id);
1097 	ath6kl_dbg(ATH6KL_DBG_USB, "product_id = %04x\n", product_id);
1098 
1099 	if (interface->cur_altsetting)
1100 		ath6kl_dbg(ATH6KL_DBG_USB, "USB Interface %d\n",
1101 			   interface->cur_altsetting->desc.bInterfaceNumber);
1102 
1103 
1104 	if (dev->speed == USB_SPEED_HIGH)
1105 		ath6kl_dbg(ATH6KL_DBG_USB, "USB 2.0 Host\n");
1106 	else
1107 		ath6kl_dbg(ATH6KL_DBG_USB, "USB 1.1 Host\n");
1108 
1109 	ar_usb = ath6kl_usb_create(interface);
1110 
1111 	if (ar_usb == NULL) {
1112 		ret = -ENOMEM;
1113 		goto err_usb_put;
1114 	}
1115 
1116 	ar = ath6kl_core_create(&ar_usb->udev->dev);
1117 	if (ar == NULL) {
1118 		ath6kl_err("Failed to alloc ath6kl core\n");
1119 		ret = -ENOMEM;
1120 		goto err_usb_destroy;
1121 	}
1122 
1123 	ar->hif_priv = ar_usb;
1124 	ar->hif_type = ATH6KL_HIF_TYPE_USB;
1125 	ar->hif_ops = &ath6kl_usb_ops;
1126 	ar->mbox_info.block_size = 16;
1127 	ar->bmi.max_data_size = 252;
1128 
1129 	ar_usb->ar = ar;
1130 
1131 	ret = ath6kl_core_init(ar, ATH6KL_HTC_TYPE_PIPE);
1132 	if (ret) {
1133 		ath6kl_err("Failed to init ath6kl core: %d\n", ret);
1134 		goto err_core_free;
1135 	}
1136 
1137 	return ret;
1138 
1139 err_core_free:
1140 	ath6kl_core_destroy(ar);
1141 err_usb_destroy:
1142 	ath6kl_usb_destroy(ar_usb);
1143 err_usb_put:
1144 	usb_put_dev(dev);
1145 
1146 	return ret;
1147 }
1148 
1149 static void ath6kl_usb_remove(struct usb_interface *interface)
1150 {
1151 	usb_put_dev(interface_to_usbdev(interface));
1152 	ath6kl_usb_device_detached(interface);
1153 }
1154 
1155 #ifdef CONFIG_PM
1156 
1157 static int ath6kl_usb_suspend(struct usb_interface *interface,
1158 			      pm_message_t message)
1159 {
1160 	struct ath6kl_usb *device;
1161 	device = usb_get_intfdata(interface);
1162 
1163 	ath6kl_usb_flush_all(device);
1164 	return 0;
1165 }
1166 
1167 static int ath6kl_usb_resume(struct usb_interface *interface)
1168 {
1169 	struct ath6kl_usb *device;
1170 	device = usb_get_intfdata(interface);
1171 
1172 	ath6kl_usb_post_recv_transfers(&device->pipes[ATH6KL_USB_PIPE_RX_DATA],
1173 				       ATH6KL_USB_RX_BUFFER_SIZE);
1174 	ath6kl_usb_post_recv_transfers(&device->pipes[ATH6KL_USB_PIPE_RX_DATA2],
1175 				       ATH6KL_USB_RX_BUFFER_SIZE);
1176 
1177 	return 0;
1178 }
1179 
1180 static int ath6kl_usb_reset_resume(struct usb_interface *intf)
1181 {
1182 	if (usb_get_intfdata(intf))
1183 		ath6kl_usb_remove(intf);
1184 	return 0;
1185 }
1186 
1187 #else
1188 
1189 #define ath6kl_usb_suspend NULL
1190 #define ath6kl_usb_resume NULL
1191 #define ath6kl_usb_reset_resume NULL
1192 
1193 #endif
1194 
1195 /* table of devices that work with this driver */
1196 static struct usb_device_id ath6kl_usb_ids[] = {
1197 	{USB_DEVICE(0x0cf3, 0x9374)},
1198 	{ /* Terminating entry */ },
1199 };
1200 
1201 MODULE_DEVICE_TABLE(usb, ath6kl_usb_ids);
1202 
1203 static struct usb_driver ath6kl_usb_driver = {
1204 	.name = "ath6kl_usb",
1205 	.probe = ath6kl_usb_probe,
1206 	.suspend = ath6kl_usb_suspend,
1207 	.resume = ath6kl_usb_resume,
1208 	.reset_resume = ath6kl_usb_reset_resume,
1209 	.disconnect = ath6kl_usb_remove,
1210 	.id_table = ath6kl_usb_ids,
1211 	.supports_autosuspend = true,
1212 	.disable_hub_initiated_lpm = 1,
1213 };
1214 
1215 static int ath6kl_usb_init(void)
1216 {
1217 	int ret;
1218 
1219 	ret = usb_register(&ath6kl_usb_driver);
1220 	if (ret) {
1221 		ath6kl_err("usb registration failed: %d\n", ret);
1222 		return ret;
1223 	}
1224 
1225 	return 0;
1226 }
1227 
1228 static void ath6kl_usb_exit(void)
1229 {
1230 	usb_deregister(&ath6kl_usb_driver);
1231 }
1232 
1233 module_init(ath6kl_usb_init);
1234 module_exit(ath6kl_usb_exit);
1235 
1236 MODULE_AUTHOR("Atheros Communications, Inc.");
1237 MODULE_DESCRIPTION("Driver support for Atheros AR600x USB devices");
1238 MODULE_LICENSE("Dual BSD/GPL");
1239 MODULE_FIRMWARE(AR6004_HW_1_0_FIRMWARE_FILE);
1240 MODULE_FIRMWARE(AR6004_HW_1_0_BOARD_DATA_FILE);
1241 MODULE_FIRMWARE(AR6004_HW_1_0_DEFAULT_BOARD_DATA_FILE);
1242 MODULE_FIRMWARE(AR6004_HW_1_1_FIRMWARE_FILE);
1243 MODULE_FIRMWARE(AR6004_HW_1_1_BOARD_DATA_FILE);
1244 MODULE_FIRMWARE(AR6004_HW_1_1_DEFAULT_BOARD_DATA_FILE);
1245 MODULE_FIRMWARE(AR6004_HW_1_2_FIRMWARE_FILE);
1246 MODULE_FIRMWARE(AR6004_HW_1_2_BOARD_DATA_FILE);
1247 MODULE_FIRMWARE(AR6004_HW_1_2_DEFAULT_BOARD_DATA_FILE);
1248 MODULE_FIRMWARE(AR6004_HW_1_3_FW_DIR "/" AR6004_HW_1_3_FIRMWARE_FILE);
1249 MODULE_FIRMWARE(AR6004_HW_1_3_BOARD_DATA_FILE);
1250 MODULE_FIRMWARE(AR6004_HW_1_3_DEFAULT_BOARD_DATA_FILE);
1251