xref: /openbmc/linux/drivers/net/usb/kaweth.c (revision fa7f32422ea1ac276b45b96a540ed5981caaa61f)
1 /****************************************************************
2  *
3  *     kaweth.c - driver for KL5KUSB101 based USB->Ethernet
4  *
5  *     (c) 2000 Interlan Communications
6  *     (c) 2000 Stephane Alnet
7  *     (C) 2001 Brad Hards
8  *     (C) 2002 Oliver Neukum
9  *
10  *     Original author: The Zapman <zapman@interlan.net>
11  *     Inspired by, and much credit goes to Michael Rothwell
12  *     <rothwell@interlan.net> for the test equipment, help, and patience
13  *     Based off of (and with thanks to) Petko Manolov's pegaus.c driver.
14  *     Also many thanks to Joel Silverman and Ed Surprenant at Kawasaki
15  *     for providing the firmware and driver resources.
16  *
17  *     This program is free software; you can redistribute it and/or
18  *     modify it under the terms of the GNU General Public License as
19  *     published by the Free Software Foundation; either version 2, or
20  *     (at your option) any later version.
21  *
22  *     This program is distributed in the hope that it will be useful,
23  *     but WITHOUT ANY WARRANTY; without even the implied warranty of
24  *     MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
25  *     GNU General Public License for more details.
26  *
27  *     You should have received a copy of the GNU General Public License
28  *     along with this program; if not, see <http://www.gnu.org/licenses/>.
29  *
30  ****************************************************************/
31 
32 /* TODO:
33  * Develop test procedures for USB net interfaces
34  * Run test procedures
35  * Fix bugs from previous two steps
36  * Snoop other OSs for any tricks we're not doing
37  * Reduce arbitrary timeouts
38  * Smart multicast support
39  * Temporary MAC change support
40  * Tunable SOFs parameter - ioctl()?
41  * Ethernet stats collection
42  * Code formatting improvements
43  */
44 
45 #include <linux/module.h>
46 #include <linux/slab.h>
47 #include <linux/string.h>
48 #include <linux/delay.h>
49 #include <linux/netdevice.h>
50 #include <linux/etherdevice.h>
51 #include <linux/usb.h>
52 #include <linux/types.h>
53 #include <linux/ethtool.h>
54 #include <linux/dma-mapping.h>
55 #include <linux/wait.h>
56 #include <linux/firmware.h>
57 #include <asm/uaccess.h>
58 #include <asm/byteorder.h>
59 
60 #undef DEBUG
61 
62 #define KAWETH_MTU			1514
63 #define KAWETH_BUF_SIZE			1664
64 #define KAWETH_TX_TIMEOUT		(5 * HZ)
65 #define KAWETH_SCRATCH_SIZE		32
66 #define KAWETH_FIRMWARE_BUF_SIZE	4096
67 #define KAWETH_CONTROL_TIMEOUT		(30000)
68 
69 #define KAWETH_STATUS_BROKEN		0x0000001
70 #define KAWETH_STATUS_CLOSING		0x0000002
71 #define KAWETH_STATUS_SUSPENDING	0x0000004
72 
73 #define KAWETH_STATUS_BLOCKED (KAWETH_STATUS_CLOSING | KAWETH_STATUS_SUSPENDING)
74 
75 #define KAWETH_PACKET_FILTER_PROMISCUOUS	0x01
76 #define KAWETH_PACKET_FILTER_ALL_MULTICAST	0x02
77 #define KAWETH_PACKET_FILTER_DIRECTED		0x04
78 #define KAWETH_PACKET_FILTER_BROADCAST		0x08
79 #define KAWETH_PACKET_FILTER_MULTICAST		0x10
80 
81 /* Table 7 */
82 #define KAWETH_COMMAND_GET_ETHERNET_DESC	0x00
83 #define KAWETH_COMMAND_MULTICAST_FILTERS        0x01
84 #define KAWETH_COMMAND_SET_PACKET_FILTER	0x02
85 #define KAWETH_COMMAND_STATISTICS               0x03
86 #define KAWETH_COMMAND_SET_TEMP_MAC     	0x06
87 #define KAWETH_COMMAND_GET_TEMP_MAC             0x07
88 #define KAWETH_COMMAND_SET_URB_SIZE		0x08
89 #define KAWETH_COMMAND_SET_SOFS_WAIT		0x09
90 #define KAWETH_COMMAND_SCAN			0xFF
91 
92 #define KAWETH_SOFS_TO_WAIT			0x05
93 
94 #define INTBUFFERSIZE				4
95 
96 #define STATE_OFFSET				0
97 #define STATE_MASK				0x40
98 #define	STATE_SHIFT				5
99 
100 #define IS_BLOCKED(s) (s & KAWETH_STATUS_BLOCKED)
101 
102 
103 MODULE_AUTHOR("Michael Zappe <zapman@interlan.net>, Stephane Alnet <stephane@u-picardie.fr>, Brad Hards <bhards@bigpond.net.au> and Oliver Neukum <oliver@neukum.org>");
104 MODULE_DESCRIPTION("KL5USB101 USB Ethernet driver");
105 MODULE_LICENSE("GPL");
106 MODULE_FIRMWARE("kaweth/new_code.bin");
107 MODULE_FIRMWARE("kaweth/new_code_fix.bin");
108 MODULE_FIRMWARE("kaweth/trigger_code.bin");
109 MODULE_FIRMWARE("kaweth/trigger_code_fix.bin");
110 
111 static const char driver_name[] = "kaweth";
112 
113 static int kaweth_probe(
114 		struct usb_interface *intf,
115 		const struct usb_device_id *id	/* from id_table */
116 	);
117 static void kaweth_disconnect(struct usb_interface *intf);
118 static int kaweth_internal_control_msg(struct usb_device *usb_dev,
119 				       unsigned int pipe,
120 				       struct usb_ctrlrequest *cmd, void *data,
121 				       int len, int timeout);
122 static int kaweth_suspend(struct usb_interface *intf, pm_message_t message);
123 static int kaweth_resume(struct usb_interface *intf);
124 
125 /****************************************************************
126  *     usb_device_id
127  ****************************************************************/
128 static struct usb_device_id usb_klsi_table[] = {
129 	{ USB_DEVICE(0x03e8, 0x0008) }, /* AOX Endpoints USB Ethernet */
130 	{ USB_DEVICE(0x04bb, 0x0901) }, /* I-O DATA USB-ET/T */
131 	{ USB_DEVICE(0x0506, 0x03e8) }, /* 3Com 3C19250 */
132 	{ USB_DEVICE(0x0506, 0x11f8) }, /* 3Com 3C460 */
133 	{ USB_DEVICE(0x0557, 0x2002) }, /* ATEN USB Ethernet */
134 	{ USB_DEVICE(0x0557, 0x4000) }, /* D-Link DSB-650C */
135 	{ USB_DEVICE(0x0565, 0x0002) }, /* Peracom Enet */
136 	{ USB_DEVICE(0x0565, 0x0003) }, /* Optus@Home UEP1045A */
137 	{ USB_DEVICE(0x0565, 0x0005) }, /* Peracom Enet2 */
138 	{ USB_DEVICE(0x05e9, 0x0008) }, /* KLSI KL5KUSB101B */
139 	{ USB_DEVICE(0x05e9, 0x0009) }, /* KLSI KL5KUSB101B (Board change) */
140 	{ USB_DEVICE(0x066b, 0x2202) }, /* Linksys USB10T */
141 	{ USB_DEVICE(0x06e1, 0x0008) }, /* ADS USB-10BT */
142 	{ USB_DEVICE(0x06e1, 0x0009) }, /* ADS USB-10BT */
143 	{ USB_DEVICE(0x0707, 0x0100) }, /* SMC 2202USB */
144 	{ USB_DEVICE(0x07aa, 0x0001) }, /* Correga K.K. */
145 	{ USB_DEVICE(0x07b8, 0x4000) }, /* D-Link DU-E10 */
146 	{ USB_DEVICE(0x07c9, 0xb010) }, /* Allied Telesyn AT-USB10 USB Ethernet Adapter */
147 	{ USB_DEVICE(0x0846, 0x1001) }, /* NetGear EA-101 */
148 	{ USB_DEVICE(0x0846, 0x1002) }, /* NetGear EA-101 */
149 	{ USB_DEVICE(0x085a, 0x0008) }, /* PortGear Ethernet Adapter */
150 	{ USB_DEVICE(0x085a, 0x0009) }, /* PortGear Ethernet Adapter */
151 	{ USB_DEVICE(0x087d, 0x5704) }, /* Jaton USB Ethernet Device Adapter */
152 	{ USB_DEVICE(0x0951, 0x0008) }, /* Kingston Technology USB Ethernet Adapter */
153 	{ USB_DEVICE(0x095a, 0x3003) }, /* Portsmith Express Ethernet Adapter */
154 	{ USB_DEVICE(0x10bd, 0x1427) }, /* ASANTE USB To Ethernet Adapter */
155 	{ USB_DEVICE(0x1342, 0x0204) }, /* Mobility USB-Ethernet Adapter */
156 	{ USB_DEVICE(0x13d2, 0x0400) }, /* Shark Pocket Adapter */
157 	{ USB_DEVICE(0x1485, 0x0001) },	/* Silicom U2E */
158 	{ USB_DEVICE(0x1485, 0x0002) }, /* Psion Dacom Gold Port Ethernet */
159 	{ USB_DEVICE(0x1645, 0x0005) }, /* Entrega E45 */
160 	{ USB_DEVICE(0x1645, 0x0008) }, /* Entrega USB Ethernet Adapter */
161 	{ USB_DEVICE(0x1645, 0x8005) }, /* PortGear Ethernet Adapter */
162 	{ USB_DEVICE(0x1668, 0x0323) }, /* Actiontec USB Ethernet */
163 	{ USB_DEVICE(0x2001, 0x4000) }, /* D-link DSB-650C */
164 	{} /* Null terminator */
165 };
166 
167 MODULE_DEVICE_TABLE (usb, usb_klsi_table);
168 
169 /****************************************************************
170  *     kaweth_driver
171  ****************************************************************/
172 static struct usb_driver kaweth_driver = {
173 	.name =		driver_name,
174 	.probe =	kaweth_probe,
175 	.disconnect =	kaweth_disconnect,
176 	.suspend =	kaweth_suspend,
177 	.resume =	kaweth_resume,
178 	.id_table =     usb_klsi_table,
179 	.supports_autosuspend =	1,
180 	.disable_hub_initiated_lpm = 1,
181 };
182 
183 typedef __u8 eth_addr_t[6];
184 
185 /****************************************************************
186  *     usb_eth_dev
187  ****************************************************************/
188 struct usb_eth_dev {
189 	char *name;
190 	__u16 vendor;
191 	__u16 device;
192 	void *pdata;
193 };
194 
195 /****************************************************************
196  *     kaweth_ethernet_configuration
197  *     Refer Table 8
198  ****************************************************************/
199 struct kaweth_ethernet_configuration
200 {
201 	__u8 size;
202 	__u8 reserved1;
203 	__u8 reserved2;
204 	eth_addr_t hw_addr;
205 	__u32 statistics_mask;
206 	__le16 segment_size;
207 	__u16 max_multicast_filters;
208 	__u8 reserved3;
209 } __packed;
210 
211 /****************************************************************
212  *     kaweth_device
213  ****************************************************************/
214 struct kaweth_device
215 {
216 	spinlock_t device_lock;
217 
218 	__u32 status;
219 	int end;
220 	int suspend_lowmem_rx;
221 	int suspend_lowmem_ctrl;
222 	int linkstate;
223 	int opened;
224 	struct delayed_work lowmem_work;
225 
226 	struct usb_device *dev;
227 	struct usb_interface *intf;
228 	struct net_device *net;
229 	wait_queue_head_t term_wait;
230 
231 	struct urb *rx_urb;
232 	struct urb *tx_urb;
233 	struct urb *irq_urb;
234 
235 	dma_addr_t intbufferhandle;
236 	__u8 *intbuffer;
237 	dma_addr_t rxbufferhandle;
238 	__u8 *rx_buf;
239 
240 
241 	struct sk_buff *tx_skb;
242 
243 	__u8 *firmware_buf;
244 	__u8 scratch[KAWETH_SCRATCH_SIZE];
245 	__u16 packet_filter_bitmap;
246 
247 	struct kaweth_ethernet_configuration configuration;
248 
249 	struct net_device_stats stats;
250 };
251 
252 /****************************************************************
253  *     kaweth_control
254  ****************************************************************/
255 static int kaweth_control(struct kaweth_device *kaweth,
256 			  unsigned int pipe,
257 			  __u8 request,
258 			  __u8 requesttype,
259 			  __u16 value,
260 			  __u16 index,
261 			  void *data,
262 			  __u16 size,
263 			  int timeout)
264 {
265 	struct usb_ctrlrequest *dr;
266 	int retval;
267 
268 	if(in_interrupt()) {
269 		netdev_dbg(kaweth->net, "in_interrupt()\n");
270 		return -EBUSY;
271 	}
272 
273 	dr = kmalloc(sizeof(struct usb_ctrlrequest), GFP_ATOMIC);
274 	if (!dr)
275 		return -ENOMEM;
276 
277 	dr->bRequestType = requesttype;
278 	dr->bRequest = request;
279 	dr->wValue = cpu_to_le16(value);
280 	dr->wIndex = cpu_to_le16(index);
281 	dr->wLength = cpu_to_le16(size);
282 
283 	retval = kaweth_internal_control_msg(kaweth->dev,
284 					     pipe,
285 					     dr,
286 					     data,
287 					     size,
288 					     timeout);
289 
290 	kfree(dr);
291 	return retval;
292 }
293 
294 /****************************************************************
295  *     kaweth_read_configuration
296  ****************************************************************/
297 static int kaweth_read_configuration(struct kaweth_device *kaweth)
298 {
299 	int retval;
300 
301 	retval = kaweth_control(kaweth,
302 				usb_rcvctrlpipe(kaweth->dev, 0),
303 				KAWETH_COMMAND_GET_ETHERNET_DESC,
304 				USB_TYPE_VENDOR | USB_DIR_IN | USB_RECIP_DEVICE,
305 				0,
306 				0,
307 				(void *)&kaweth->configuration,
308 				sizeof(kaweth->configuration),
309 				KAWETH_CONTROL_TIMEOUT);
310 
311 	return retval;
312 }
313 
314 /****************************************************************
315  *     kaweth_set_urb_size
316  ****************************************************************/
317 static int kaweth_set_urb_size(struct kaweth_device *kaweth, __u16 urb_size)
318 {
319 	int retval;
320 
321 	netdev_dbg(kaweth->net, "Setting URB size to %d\n", (unsigned)urb_size);
322 
323 	retval = kaweth_control(kaweth,
324 				usb_sndctrlpipe(kaweth->dev, 0),
325 				KAWETH_COMMAND_SET_URB_SIZE,
326 				USB_TYPE_VENDOR | USB_DIR_OUT | USB_RECIP_DEVICE,
327 				urb_size,
328 				0,
329 				(void *)&kaweth->scratch,
330 				0,
331 				KAWETH_CONTROL_TIMEOUT);
332 
333 	return retval;
334 }
335 
336 /****************************************************************
337  *     kaweth_set_sofs_wait
338  ****************************************************************/
339 static int kaweth_set_sofs_wait(struct kaweth_device *kaweth, __u16 sofs_wait)
340 {
341 	int retval;
342 
343 	netdev_dbg(kaweth->net, "Set SOFS wait to %d\n", (unsigned)sofs_wait);
344 
345 	retval = kaweth_control(kaweth,
346 				usb_sndctrlpipe(kaweth->dev, 0),
347 				KAWETH_COMMAND_SET_SOFS_WAIT,
348 				USB_TYPE_VENDOR | USB_DIR_OUT | USB_RECIP_DEVICE,
349 				sofs_wait,
350 				0,
351 				(void *)&kaweth->scratch,
352 				0,
353 				KAWETH_CONTROL_TIMEOUT);
354 
355 	return retval;
356 }
357 
358 /****************************************************************
359  *     kaweth_set_receive_filter
360  ****************************************************************/
361 static int kaweth_set_receive_filter(struct kaweth_device *kaweth,
362 				     __u16 receive_filter)
363 {
364 	int retval;
365 
366 	netdev_dbg(kaweth->net, "Set receive filter to %d\n",
367 		   (unsigned)receive_filter);
368 
369 	retval = kaweth_control(kaweth,
370 				usb_sndctrlpipe(kaweth->dev, 0),
371 				KAWETH_COMMAND_SET_PACKET_FILTER,
372 				USB_TYPE_VENDOR | USB_DIR_OUT | USB_RECIP_DEVICE,
373 				receive_filter,
374 				0,
375 				(void *)&kaweth->scratch,
376 				0,
377 				KAWETH_CONTROL_TIMEOUT);
378 
379 	return retval;
380 }
381 
382 /****************************************************************
383  *     kaweth_download_firmware
384  ****************************************************************/
385 static int kaweth_download_firmware(struct kaweth_device *kaweth,
386 				    const char *fwname,
387 				    __u8 interrupt,
388 				    __u8 type)
389 {
390 	const struct firmware *fw;
391 	int data_len;
392 	int ret;
393 
394 	ret = request_firmware(&fw, fwname, &kaweth->dev->dev);
395 	if (ret) {
396 		dev_err(&kaweth->intf->dev, "Firmware request failed\n");
397 		return ret;
398 	}
399 
400 	if (fw->size > KAWETH_FIRMWARE_BUF_SIZE) {
401 		dev_err(&kaweth->intf->dev, "Firmware too big: %zu\n",
402 			fw->size);
403 		release_firmware(fw);
404 		return -ENOSPC;
405 	}
406 	data_len = fw->size;
407 	memcpy(kaweth->firmware_buf, fw->data, fw->size);
408 
409 	release_firmware(fw);
410 
411 	kaweth->firmware_buf[2] = (data_len & 0xFF) - 7;
412 	kaweth->firmware_buf[3] = data_len >> 8;
413 	kaweth->firmware_buf[4] = type;
414 	kaweth->firmware_buf[5] = interrupt;
415 
416 	netdev_dbg(kaweth->net, "High: %i, Low:%i\n", kaweth->firmware_buf[3],
417 		   kaweth->firmware_buf[2]);
418 
419 	netdev_dbg(kaweth->net,
420 		   "Downloading firmware at %p to kaweth device at %p\n",
421 		   kaweth->firmware_buf, kaweth);
422 	netdev_dbg(kaweth->net, "Firmware length: %d\n", data_len);
423 
424 	return kaweth_control(kaweth,
425 		              usb_sndctrlpipe(kaweth->dev, 0),
426 			      KAWETH_COMMAND_SCAN,
427 			      USB_TYPE_VENDOR | USB_DIR_OUT | USB_RECIP_DEVICE,
428 			      0,
429 			      0,
430 			      (void *)kaweth->firmware_buf,
431 			      data_len,
432 			      KAWETH_CONTROL_TIMEOUT);
433 }
434 
435 /****************************************************************
436  *     kaweth_trigger_firmware
437  ****************************************************************/
438 static int kaweth_trigger_firmware(struct kaweth_device *kaweth,
439 				   __u8 interrupt)
440 {
441 	kaweth->firmware_buf[0] = 0xB6;
442 	kaweth->firmware_buf[1] = 0xC3;
443 	kaweth->firmware_buf[2] = 0x01;
444 	kaweth->firmware_buf[3] = 0x00;
445 	kaweth->firmware_buf[4] = 0x06;
446 	kaweth->firmware_buf[5] = interrupt;
447 	kaweth->firmware_buf[6] = 0x00;
448 	kaweth->firmware_buf[7] = 0x00;
449 
450 	return kaweth_control(kaweth,
451 			      usb_sndctrlpipe(kaweth->dev, 0),
452 			      KAWETH_COMMAND_SCAN,
453 			      USB_TYPE_VENDOR | USB_DIR_OUT | USB_RECIP_DEVICE,
454 			      0,
455 			      0,
456 			      (void *)kaweth->firmware_buf,
457 			      8,
458 			      KAWETH_CONTROL_TIMEOUT);
459 }
460 
461 /****************************************************************
462  *     kaweth_reset
463  ****************************************************************/
464 static int kaweth_reset(struct kaweth_device *kaweth)
465 {
466 	int result;
467 
468 	result = usb_reset_configuration(kaweth->dev);
469 	mdelay(10);
470 
471 	netdev_dbg(kaweth->net, "kaweth_reset() returns %d.\n", result);
472 
473 	return result;
474 }
475 
476 static void kaweth_usb_receive(struct urb *);
477 static int kaweth_resubmit_rx_urb(struct kaweth_device *, gfp_t);
478 
479 /****************************************************************
480 	int_callback
481 *****************************************************************/
482 
483 static void kaweth_resubmit_int_urb(struct kaweth_device *kaweth, gfp_t mf)
484 {
485 	int status;
486 
487 	status = usb_submit_urb (kaweth->irq_urb, mf);
488 	if (unlikely(status == -ENOMEM)) {
489 		kaweth->suspend_lowmem_ctrl = 1;
490 		schedule_delayed_work(&kaweth->lowmem_work, HZ/4);
491 	} else {
492 		kaweth->suspend_lowmem_ctrl = 0;
493 	}
494 
495 	if (status)
496 		dev_err(&kaweth->intf->dev,
497 			"can't resubmit intr, %s-%s, status %d\n",
498 			kaweth->dev->bus->bus_name,
499 			kaweth->dev->devpath, status);
500 }
501 
502 static void int_callback(struct urb *u)
503 {
504 	struct kaweth_device *kaweth = u->context;
505 	int act_state;
506 	int status = u->status;
507 
508 	switch (status) {
509 	case 0:			/* success */
510 		break;
511 	case -ECONNRESET:	/* unlink */
512 	case -ENOENT:
513 	case -ESHUTDOWN:
514 		return;
515 	/* -EPIPE:  should clear the halt */
516 	default:		/* error */
517 		goto resubmit;
518 	}
519 
520 	/* we check the link state to report changes */
521 	if (kaweth->linkstate != (act_state = ( kaweth->intbuffer[STATE_OFFSET] | STATE_MASK) >> STATE_SHIFT)) {
522 		if (act_state)
523 			netif_carrier_on(kaweth->net);
524 		else
525 			netif_carrier_off(kaweth->net);
526 
527 		kaweth->linkstate = act_state;
528 	}
529 resubmit:
530 	kaweth_resubmit_int_urb(kaweth, GFP_ATOMIC);
531 }
532 
533 static void kaweth_resubmit_tl(struct work_struct *work)
534 {
535 	struct kaweth_device *kaweth =
536 		container_of(work, struct kaweth_device, lowmem_work.work);
537 
538 	if (IS_BLOCKED(kaweth->status))
539 		return;
540 
541 	if (kaweth->suspend_lowmem_rx)
542 		kaweth_resubmit_rx_urb(kaweth, GFP_NOIO);
543 
544 	if (kaweth->suspend_lowmem_ctrl)
545 		kaweth_resubmit_int_urb(kaweth, GFP_NOIO);
546 }
547 
548 
549 /****************************************************************
550  *     kaweth_resubmit_rx_urb
551  ****************************************************************/
552 static int kaweth_resubmit_rx_urb(struct kaweth_device *kaweth,
553 						gfp_t mem_flags)
554 {
555 	int result;
556 
557 	usb_fill_bulk_urb(kaweth->rx_urb,
558 		      kaweth->dev,
559 		      usb_rcvbulkpipe(kaweth->dev, 1),
560 		      kaweth->rx_buf,
561 		      KAWETH_BUF_SIZE,
562 		      kaweth_usb_receive,
563 		      kaweth);
564 	kaweth->rx_urb->transfer_flags |= URB_NO_TRANSFER_DMA_MAP;
565 	kaweth->rx_urb->transfer_dma = kaweth->rxbufferhandle;
566 
567 	if((result = usb_submit_urb(kaweth->rx_urb, mem_flags))) {
568 		if (result == -ENOMEM) {
569 			kaweth->suspend_lowmem_rx = 1;
570 			schedule_delayed_work(&kaweth->lowmem_work, HZ/4);
571 		}
572 		dev_err(&kaweth->intf->dev, "resubmitting rx_urb %d failed\n",
573 			result);
574 	} else {
575 		kaweth->suspend_lowmem_rx = 0;
576 	}
577 
578 	return result;
579 }
580 
581 static void kaweth_async_set_rx_mode(struct kaweth_device *kaweth);
582 
583 /****************************************************************
584  *     kaweth_usb_receive
585  ****************************************************************/
586 static void kaweth_usb_receive(struct urb *urb)
587 {
588 	struct device *dev = &urb->dev->dev;
589 	struct kaweth_device *kaweth = urb->context;
590 	struct net_device *net = kaweth->net;
591 	int status = urb->status;
592 
593 	int count = urb->actual_length;
594 	int count2 = urb->transfer_buffer_length;
595 
596 	__u16 pkt_len = le16_to_cpup((__le16 *)kaweth->rx_buf);
597 
598 	struct sk_buff *skb;
599 
600 	if (unlikely(status == -EPIPE)) {
601 		kaweth->stats.rx_errors++;
602 		kaweth->end = 1;
603 		wake_up(&kaweth->term_wait);
604 		dev_dbg(dev, "Status was -EPIPE.\n");
605 		return;
606 	}
607 	if (unlikely(status == -ECONNRESET || status == -ESHUTDOWN)) {
608 		/* we are killed - set a flag and wake the disconnect handler */
609 		kaweth->end = 1;
610 		wake_up(&kaweth->term_wait);
611 		dev_dbg(dev, "Status was -ECONNRESET or -ESHUTDOWN.\n");
612 		return;
613 	}
614 	if (unlikely(status == -EPROTO || status == -ETIME ||
615 		     status == -EILSEQ)) {
616 		kaweth->stats.rx_errors++;
617 		dev_dbg(dev, "Status was -EPROTO, -ETIME, or -EILSEQ.\n");
618 		return;
619 	}
620 	if (unlikely(status == -EOVERFLOW)) {
621 		kaweth->stats.rx_errors++;
622 		dev_dbg(dev, "Status was -EOVERFLOW.\n");
623 	}
624 	spin_lock(&kaweth->device_lock);
625 	if (IS_BLOCKED(kaweth->status)) {
626 		spin_unlock(&kaweth->device_lock);
627 		return;
628 	}
629 	spin_unlock(&kaweth->device_lock);
630 
631 	if(status && status != -EREMOTEIO && count != 1) {
632 		dev_err(&kaweth->intf->dev,
633 			"%s RX status: %d count: %d packet_len: %d\n",
634 			net->name, status, count, (int)pkt_len);
635 		kaweth_resubmit_rx_urb(kaweth, GFP_ATOMIC);
636                 return;
637 	}
638 
639 	if(kaweth->net && (count > 2)) {
640 		if(pkt_len > (count - 2)) {
641 			dev_err(&kaweth->intf->dev,
642 				"Packet length too long for USB frame (pkt_len: %x, count: %x)\n",
643 				pkt_len, count);
644 			dev_err(&kaweth->intf->dev, "Packet len & 2047: %x\n",
645 				pkt_len & 2047);
646 			dev_err(&kaweth->intf->dev, "Count 2: %x\n", count2);
647 		        kaweth_resubmit_rx_urb(kaweth, GFP_ATOMIC);
648                         return;
649                 }
650 
651 		if(!(skb = dev_alloc_skb(pkt_len+2))) {
652 		        kaweth_resubmit_rx_urb(kaweth, GFP_ATOMIC);
653                         return;
654 		}
655 
656 		skb_reserve(skb, 2);    /* Align IP on 16 byte boundaries */
657 
658 		skb_copy_to_linear_data(skb, kaweth->rx_buf + 2, pkt_len);
659 
660 		skb_put(skb, pkt_len);
661 
662 		skb->protocol = eth_type_trans(skb, net);
663 
664 		netif_rx(skb);
665 
666 		kaweth->stats.rx_packets++;
667 		kaweth->stats.rx_bytes += pkt_len;
668 	}
669 
670 	kaweth_resubmit_rx_urb(kaweth, GFP_ATOMIC);
671 }
672 
673 /****************************************************************
674  *     kaweth_open
675  ****************************************************************/
676 static int kaweth_open(struct net_device *net)
677 {
678 	struct kaweth_device *kaweth = netdev_priv(net);
679 	int res;
680 
681 	res = usb_autopm_get_interface(kaweth->intf);
682 	if (res) {
683 		dev_err(&kaweth->intf->dev, "Interface cannot be resumed.\n");
684 		return -EIO;
685 	}
686 	res = kaweth_resubmit_rx_urb(kaweth, GFP_KERNEL);
687 	if (res)
688 		goto err_out;
689 
690 	usb_fill_int_urb(
691 		kaweth->irq_urb,
692 		kaweth->dev,
693 		usb_rcvintpipe(kaweth->dev, 3),
694 		kaweth->intbuffer,
695 		INTBUFFERSIZE,
696 		int_callback,
697 		kaweth,
698 		250); /* overriding the descriptor */
699 	kaweth->irq_urb->transfer_dma = kaweth->intbufferhandle;
700 	kaweth->irq_urb->transfer_flags |= URB_NO_TRANSFER_DMA_MAP;
701 
702 	res = usb_submit_urb(kaweth->irq_urb, GFP_KERNEL);
703 	if (res) {
704 		usb_kill_urb(kaweth->rx_urb);
705 		goto err_out;
706 	}
707 	kaweth->opened = 1;
708 
709 	netif_start_queue(net);
710 
711 	kaweth_async_set_rx_mode(kaweth);
712 	return 0;
713 
714 err_out:
715 	usb_autopm_put_interface(kaweth->intf);
716 	return -EIO;
717 }
718 
719 /****************************************************************
720  *     kaweth_kill_urbs
721  ****************************************************************/
722 static void kaweth_kill_urbs(struct kaweth_device *kaweth)
723 {
724 	usb_kill_urb(kaweth->irq_urb);
725 	usb_kill_urb(kaweth->rx_urb);
726 	usb_kill_urb(kaweth->tx_urb);
727 
728 	cancel_delayed_work_sync(&kaweth->lowmem_work);
729 
730 	/* a scheduled work may have resubmitted,
731 	   we hit them again */
732 	usb_kill_urb(kaweth->irq_urb);
733 	usb_kill_urb(kaweth->rx_urb);
734 }
735 
736 /****************************************************************
737  *     kaweth_close
738  ****************************************************************/
739 static int kaweth_close(struct net_device *net)
740 {
741 	struct kaweth_device *kaweth = netdev_priv(net);
742 
743 	netif_stop_queue(net);
744 	kaweth->opened = 0;
745 
746 	kaweth->status |= KAWETH_STATUS_CLOSING;
747 
748 	kaweth_kill_urbs(kaweth);
749 
750 	kaweth->status &= ~KAWETH_STATUS_CLOSING;
751 
752 	usb_autopm_put_interface(kaweth->intf);
753 
754 	return 0;
755 }
756 
757 static u32 kaweth_get_link(struct net_device *dev)
758 {
759 	struct kaweth_device *kaweth = netdev_priv(dev);
760 
761 	return kaweth->linkstate;
762 }
763 
764 static const struct ethtool_ops ops = {
765 	.get_link	= kaweth_get_link
766 };
767 
768 /****************************************************************
769  *     kaweth_usb_transmit_complete
770  ****************************************************************/
771 static void kaweth_usb_transmit_complete(struct urb *urb)
772 {
773 	struct kaweth_device *kaweth = urb->context;
774 	struct sk_buff *skb = kaweth->tx_skb;
775 	int status = urb->status;
776 
777 	if (unlikely(status != 0))
778 		if (status != -ENOENT)
779 			dev_dbg(&urb->dev->dev, "%s: TX status %d.\n",
780 				kaweth->net->name, status);
781 
782 	netif_wake_queue(kaweth->net);
783 	dev_kfree_skb_irq(skb);
784 }
785 
786 /****************************************************************
787  *     kaweth_start_xmit
788  ****************************************************************/
789 static netdev_tx_t kaweth_start_xmit(struct sk_buff *skb,
790 					   struct net_device *net)
791 {
792 	struct kaweth_device *kaweth = netdev_priv(net);
793 	__le16 *private_header;
794 
795 	int res;
796 
797 	spin_lock_irq(&kaweth->device_lock);
798 
799 	kaweth_async_set_rx_mode(kaweth);
800 	netif_stop_queue(net);
801 	if (IS_BLOCKED(kaweth->status)) {
802 		goto skip;
803 	}
804 
805 	/* We now decide whether we can put our special header into the sk_buff */
806 	if (skb_cloned(skb) || skb_headroom(skb) < 2) {
807 		/* no such luck - we make our own */
808 		struct sk_buff *copied_skb;
809 		copied_skb = skb_copy_expand(skb, 2, 0, GFP_ATOMIC);
810 		dev_kfree_skb_irq(skb);
811 		skb = copied_skb;
812 		if (!copied_skb) {
813 			kaweth->stats.tx_errors++;
814 			netif_start_queue(net);
815 			spin_unlock_irq(&kaweth->device_lock);
816 			return NETDEV_TX_OK;
817 		}
818 	}
819 
820 	private_header = (__le16 *)__skb_push(skb, 2);
821 	*private_header = cpu_to_le16(skb->len-2);
822 	kaweth->tx_skb = skb;
823 
824 	usb_fill_bulk_urb(kaweth->tx_urb,
825 		      kaweth->dev,
826 		      usb_sndbulkpipe(kaweth->dev, 2),
827 		      private_header,
828 		      skb->len,
829 		      kaweth_usb_transmit_complete,
830 		      kaweth);
831 	kaweth->end = 0;
832 
833 	if((res = usb_submit_urb(kaweth->tx_urb, GFP_ATOMIC)))
834 	{
835 		dev_warn(&net->dev, "kaweth failed tx_urb %d\n", res);
836 skip:
837 		kaweth->stats.tx_errors++;
838 
839 		netif_start_queue(net);
840 		dev_kfree_skb_irq(skb);
841 	}
842 	else
843 	{
844 		kaweth->stats.tx_packets++;
845 		kaweth->stats.tx_bytes += skb->len;
846 	}
847 
848 	spin_unlock_irq(&kaweth->device_lock);
849 
850 	return NETDEV_TX_OK;
851 }
852 
853 /****************************************************************
854  *     kaweth_set_rx_mode
855  ****************************************************************/
856 static void kaweth_set_rx_mode(struct net_device *net)
857 {
858 	struct kaweth_device *kaweth = netdev_priv(net);
859 
860 	__u16 packet_filter_bitmap = KAWETH_PACKET_FILTER_DIRECTED |
861                                      KAWETH_PACKET_FILTER_BROADCAST |
862 		                     KAWETH_PACKET_FILTER_MULTICAST;
863 
864 	netdev_dbg(net, "Setting Rx mode to %d\n", packet_filter_bitmap);
865 
866 	netif_stop_queue(net);
867 
868 	if (net->flags & IFF_PROMISC) {
869 		packet_filter_bitmap |= KAWETH_PACKET_FILTER_PROMISCUOUS;
870 	}
871 	else if (!netdev_mc_empty(net) || (net->flags & IFF_ALLMULTI)) {
872 		packet_filter_bitmap |= KAWETH_PACKET_FILTER_ALL_MULTICAST;
873 	}
874 
875 	kaweth->packet_filter_bitmap = packet_filter_bitmap;
876 	netif_wake_queue(net);
877 }
878 
879 /****************************************************************
880  *     kaweth_async_set_rx_mode
881  ****************************************************************/
882 static void kaweth_async_set_rx_mode(struct kaweth_device *kaweth)
883 {
884 	int result;
885 	__u16 packet_filter_bitmap = kaweth->packet_filter_bitmap;
886 
887 	kaweth->packet_filter_bitmap = 0;
888 	if (packet_filter_bitmap == 0)
889 		return;
890 
891 	if (in_interrupt())
892 		return;
893 
894 	result = kaweth_control(kaweth,
895 				usb_sndctrlpipe(kaweth->dev, 0),
896 				KAWETH_COMMAND_SET_PACKET_FILTER,
897 				USB_TYPE_VENDOR | USB_DIR_OUT | USB_RECIP_DEVICE,
898 				packet_filter_bitmap,
899 				0,
900 				(void *)&kaweth->scratch,
901 				0,
902 				KAWETH_CONTROL_TIMEOUT);
903 
904 	if(result < 0) {
905 		dev_err(&kaweth->intf->dev, "Failed to set Rx mode: %d\n",
906 			result);
907 	}
908 	else {
909 		netdev_dbg(kaweth->net, "Set Rx mode to %d\n",
910 			   packet_filter_bitmap);
911 	}
912 }
913 
914 /****************************************************************
915  *     kaweth_netdev_stats
916  ****************************************************************/
917 static struct net_device_stats *kaweth_netdev_stats(struct net_device *dev)
918 {
919 	struct kaweth_device *kaweth = netdev_priv(dev);
920 	return &kaweth->stats;
921 }
922 
923 /****************************************************************
924  *     kaweth_tx_timeout
925  ****************************************************************/
926 static void kaweth_tx_timeout(struct net_device *net)
927 {
928 	struct kaweth_device *kaweth = netdev_priv(net);
929 
930 	dev_warn(&net->dev, "%s: Tx timed out. Resetting.\n", net->name);
931 	kaweth->stats.tx_errors++;
932 	netif_trans_update(net);
933 
934 	usb_unlink_urb(kaweth->tx_urb);
935 }
936 
937 /****************************************************************
938  *     kaweth_suspend
939  ****************************************************************/
940 static int kaweth_suspend(struct usb_interface *intf, pm_message_t message)
941 {
942 	struct kaweth_device *kaweth = usb_get_intfdata(intf);
943 	unsigned long flags;
944 
945 	spin_lock_irqsave(&kaweth->device_lock, flags);
946 	kaweth->status |= KAWETH_STATUS_SUSPENDING;
947 	spin_unlock_irqrestore(&kaweth->device_lock, flags);
948 
949 	kaweth_kill_urbs(kaweth);
950 	return 0;
951 }
952 
953 /****************************************************************
954  *     kaweth_resume
955  ****************************************************************/
956 static int kaweth_resume(struct usb_interface *intf)
957 {
958 	struct kaweth_device *kaweth = usb_get_intfdata(intf);
959 	unsigned long flags;
960 
961 	spin_lock_irqsave(&kaweth->device_lock, flags);
962 	kaweth->status &= ~KAWETH_STATUS_SUSPENDING;
963 	spin_unlock_irqrestore(&kaweth->device_lock, flags);
964 
965 	if (!kaweth->opened)
966 		return 0;
967 	kaweth_resubmit_rx_urb(kaweth, GFP_NOIO);
968 	kaweth_resubmit_int_urb(kaweth, GFP_NOIO);
969 
970 	return 0;
971 }
972 
973 /****************************************************************
974  *     kaweth_probe
975  ****************************************************************/
976 
977 
978 static const struct net_device_ops kaweth_netdev_ops = {
979 	.ndo_open =			kaweth_open,
980 	.ndo_stop =			kaweth_close,
981 	.ndo_start_xmit =		kaweth_start_xmit,
982 	.ndo_tx_timeout =		kaweth_tx_timeout,
983 	.ndo_set_rx_mode =		kaweth_set_rx_mode,
984 	.ndo_get_stats =		kaweth_netdev_stats,
985 	.ndo_change_mtu =		eth_change_mtu,
986 	.ndo_set_mac_address =		eth_mac_addr,
987 	.ndo_validate_addr =		eth_validate_addr,
988 };
989 
990 static int kaweth_probe(
991 		struct usb_interface *intf,
992 		const struct usb_device_id *id      /* from id_table */
993 	)
994 {
995 	struct device *dev = &intf->dev;
996 	struct usb_device *udev = interface_to_usbdev(intf);
997 	struct kaweth_device *kaweth;
998 	struct net_device *netdev;
999 	const eth_addr_t bcast_addr = { 0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF };
1000 	int result = 0;
1001 	int rv = -EIO;
1002 
1003 	dev_dbg(dev,
1004 		"Kawasaki Device Probe (Device number:%d): 0x%4.4x:0x%4.4x:0x%4.4x\n",
1005 		udev->devnum, le16_to_cpu(udev->descriptor.idVendor),
1006 		le16_to_cpu(udev->descriptor.idProduct),
1007 		le16_to_cpu(udev->descriptor.bcdDevice));
1008 
1009 	dev_dbg(dev, "Device at %p\n", udev);
1010 
1011 	dev_dbg(dev, "Descriptor length: %x type: %x\n",
1012 		(int)udev->descriptor.bLength,
1013 		(int)udev->descriptor.bDescriptorType);
1014 
1015 	netdev = alloc_etherdev(sizeof(*kaweth));
1016 	if (!netdev)
1017 		return -ENOMEM;
1018 
1019 	kaweth = netdev_priv(netdev);
1020 	kaweth->dev = udev;
1021 	kaweth->net = netdev;
1022 	kaweth->intf = intf;
1023 
1024 	spin_lock_init(&kaweth->device_lock);
1025 	init_waitqueue_head(&kaweth->term_wait);
1026 
1027 	dev_dbg(dev, "Resetting.\n");
1028 
1029 	kaweth_reset(kaweth);
1030 
1031 	/*
1032 	 * If high byte of bcdDevice is nonzero, firmware is already
1033 	 * downloaded. Don't try to do it again, or we'll hang the device.
1034 	 */
1035 
1036 	if (le16_to_cpu(udev->descriptor.bcdDevice) >> 8) {
1037 		dev_info(dev, "Firmware present in device.\n");
1038 	} else {
1039 		/* Download the firmware */
1040 		dev_info(dev, "Downloading firmware...\n");
1041 		kaweth->firmware_buf = (__u8 *)__get_free_page(GFP_KERNEL);
1042 		if (!kaweth->firmware_buf) {
1043 			rv = -ENOMEM;
1044 			goto err_free_netdev;
1045 		}
1046 		if ((result = kaweth_download_firmware(kaweth,
1047 						      "kaweth/new_code.bin",
1048 						      100,
1049 						      2)) < 0) {
1050 			dev_err(dev, "Error downloading firmware (%d)\n",
1051 				result);
1052 			goto err_fw;
1053 		}
1054 
1055 		if ((result = kaweth_download_firmware(kaweth,
1056 						      "kaweth/new_code_fix.bin",
1057 						      100,
1058 						      3)) < 0) {
1059 			dev_err(dev, "Error downloading firmware fix (%d)\n",
1060 				result);
1061 			goto err_fw;
1062 		}
1063 
1064 		if ((result = kaweth_download_firmware(kaweth,
1065 						      "kaweth/trigger_code.bin",
1066 						      126,
1067 						      2)) < 0) {
1068 			dev_err(dev, "Error downloading trigger code (%d)\n",
1069 				result);
1070 			goto err_fw;
1071 
1072 		}
1073 
1074 		if ((result = kaweth_download_firmware(kaweth,
1075 						      "kaweth/trigger_code_fix.bin",
1076 						      126,
1077 						      3)) < 0) {
1078 			dev_err(dev, "Error downloading trigger code fix (%d)\n", result);
1079 			goto err_fw;
1080 		}
1081 
1082 
1083 		if ((result = kaweth_trigger_firmware(kaweth, 126)) < 0) {
1084 			dev_err(dev, "Error triggering firmware (%d)\n", result);
1085 			goto err_fw;
1086 		}
1087 
1088 		/* Device will now disappear for a moment...  */
1089 		dev_info(dev, "Firmware loaded.  I'll be back...\n");
1090 err_fw:
1091 		free_page((unsigned long)kaweth->firmware_buf);
1092 		free_netdev(netdev);
1093 		return -EIO;
1094 	}
1095 
1096 	result = kaweth_read_configuration(kaweth);
1097 
1098 	if(result < 0) {
1099 		dev_err(dev, "Error reading configuration (%d), no net device created\n", result);
1100 		goto err_free_netdev;
1101 	}
1102 
1103 	dev_info(dev, "Statistics collection: %x\n", kaweth->configuration.statistics_mask);
1104 	dev_info(dev, "Multicast filter limit: %x\n", kaweth->configuration.max_multicast_filters & ((1 << 15) - 1));
1105 	dev_info(dev, "MTU: %d\n", le16_to_cpu(kaweth->configuration.segment_size));
1106 	dev_info(dev, "Read MAC address %pM\n", kaweth->configuration.hw_addr);
1107 
1108 	if(!memcmp(&kaweth->configuration.hw_addr,
1109                    &bcast_addr,
1110 		   sizeof(bcast_addr))) {
1111 		dev_err(dev, "Firmware not functioning properly, no net device created\n");
1112 		goto err_free_netdev;
1113 	}
1114 
1115 	if(kaweth_set_urb_size(kaweth, KAWETH_BUF_SIZE) < 0) {
1116 		dev_dbg(dev, "Error setting URB size\n");
1117 		goto err_free_netdev;
1118 	}
1119 
1120 	if(kaweth_set_sofs_wait(kaweth, KAWETH_SOFS_TO_WAIT) < 0) {
1121 		dev_err(dev, "Error setting SOFS wait\n");
1122 		goto err_free_netdev;
1123 	}
1124 
1125 	result = kaweth_set_receive_filter(kaweth,
1126                                            KAWETH_PACKET_FILTER_DIRECTED |
1127                                            KAWETH_PACKET_FILTER_BROADCAST |
1128                                            KAWETH_PACKET_FILTER_MULTICAST);
1129 
1130 	if(result < 0) {
1131 		dev_err(dev, "Error setting receive filter\n");
1132 		goto err_free_netdev;
1133 	}
1134 
1135 	dev_dbg(dev, "Initializing net device.\n");
1136 
1137 	kaweth->tx_urb = usb_alloc_urb(0, GFP_KERNEL);
1138 	if (!kaweth->tx_urb)
1139 		goto err_free_netdev;
1140 	kaweth->rx_urb = usb_alloc_urb(0, GFP_KERNEL);
1141 	if (!kaweth->rx_urb)
1142 		goto err_only_tx;
1143 	kaweth->irq_urb = usb_alloc_urb(0, GFP_KERNEL);
1144 	if (!kaweth->irq_urb)
1145 		goto err_tx_and_rx;
1146 
1147 	kaweth->intbuffer = usb_alloc_coherent(	kaweth->dev,
1148 						INTBUFFERSIZE,
1149 						GFP_KERNEL,
1150 						&kaweth->intbufferhandle);
1151 	if (!kaweth->intbuffer)
1152 		goto err_tx_and_rx_and_irq;
1153 	kaweth->rx_buf = usb_alloc_coherent(	kaweth->dev,
1154 						KAWETH_BUF_SIZE,
1155 						GFP_KERNEL,
1156 						&kaweth->rxbufferhandle);
1157 	if (!kaweth->rx_buf)
1158 		goto err_all_but_rxbuf;
1159 
1160 	memcpy(netdev->broadcast, &bcast_addr, sizeof(bcast_addr));
1161 	memcpy(netdev->dev_addr, &kaweth->configuration.hw_addr,
1162                sizeof(kaweth->configuration.hw_addr));
1163 
1164 	netdev->netdev_ops = &kaweth_netdev_ops;
1165 	netdev->watchdog_timeo = KAWETH_TX_TIMEOUT;
1166 	netdev->mtu = le16_to_cpu(kaweth->configuration.segment_size);
1167 	netdev->ethtool_ops = &ops;
1168 
1169 	/* kaweth is zeroed as part of alloc_netdev */
1170 	INIT_DELAYED_WORK(&kaweth->lowmem_work, kaweth_resubmit_tl);
1171 	usb_set_intfdata(intf, kaweth);
1172 
1173 	SET_NETDEV_DEV(netdev, dev);
1174 	if (register_netdev(netdev) != 0) {
1175 		dev_err(dev, "Error registering netdev.\n");
1176 		goto err_intfdata;
1177 	}
1178 
1179 	dev_info(dev, "kaweth interface created at %s\n",
1180 		 kaweth->net->name);
1181 
1182 	return 0;
1183 
1184 err_intfdata:
1185 	usb_set_intfdata(intf, NULL);
1186 	usb_free_coherent(kaweth->dev, KAWETH_BUF_SIZE, (void *)kaweth->rx_buf, kaweth->rxbufferhandle);
1187 err_all_but_rxbuf:
1188 	usb_free_coherent(kaweth->dev, INTBUFFERSIZE, (void *)kaweth->intbuffer, kaweth->intbufferhandle);
1189 err_tx_and_rx_and_irq:
1190 	usb_free_urb(kaweth->irq_urb);
1191 err_tx_and_rx:
1192 	usb_free_urb(kaweth->rx_urb);
1193 err_only_tx:
1194 	usb_free_urb(kaweth->tx_urb);
1195 err_free_netdev:
1196 	free_netdev(netdev);
1197 
1198 	return rv;
1199 }
1200 
1201 /****************************************************************
1202  *     kaweth_disconnect
1203  ****************************************************************/
1204 static void kaweth_disconnect(struct usb_interface *intf)
1205 {
1206 	struct kaweth_device *kaweth = usb_get_intfdata(intf);
1207 	struct net_device *netdev;
1208 
1209 	usb_set_intfdata(intf, NULL);
1210 	if (!kaweth) {
1211 		dev_warn(&intf->dev, "unregistering non-existent device\n");
1212 		return;
1213 	}
1214 	netdev = kaweth->net;
1215 
1216 	netdev_dbg(kaweth->net, "Unregistering net device\n");
1217 	unregister_netdev(netdev);
1218 
1219 	usb_free_urb(kaweth->rx_urb);
1220 	usb_free_urb(kaweth->tx_urb);
1221 	usb_free_urb(kaweth->irq_urb);
1222 
1223 	usb_free_coherent(kaweth->dev, KAWETH_BUF_SIZE, (void *)kaweth->rx_buf, kaweth->rxbufferhandle);
1224 	usb_free_coherent(kaweth->dev, INTBUFFERSIZE, (void *)kaweth->intbuffer, kaweth->intbufferhandle);
1225 
1226 	free_netdev(netdev);
1227 }
1228 
1229 
1230 // FIXME this completion stuff is a modified clone of
1231 // an OLD version of some stuff in usb.c ...
1232 struct usb_api_data {
1233 	wait_queue_head_t wqh;
1234 	int done;
1235 };
1236 
1237 /*-------------------------------------------------------------------*
1238  * completion handler for compatibility wrappers (sync control/bulk) *
1239  *-------------------------------------------------------------------*/
1240 static void usb_api_blocking_completion(struct urb *urb)
1241 {
1242         struct usb_api_data *awd = (struct usb_api_data *)urb->context;
1243 
1244 	awd->done=1;
1245 	wake_up(&awd->wqh);
1246 }
1247 
1248 /*-------------------------------------------------------------------*
1249  *                         COMPATIBILITY STUFF                       *
1250  *-------------------------------------------------------------------*/
1251 
1252 // Starts urb and waits for completion or timeout
1253 static int usb_start_wait_urb(struct urb *urb, int timeout, int* actual_length)
1254 {
1255 	struct usb_api_data awd;
1256         int status;
1257 
1258         init_waitqueue_head(&awd.wqh);
1259         awd.done = 0;
1260 
1261         urb->context = &awd;
1262         status = usb_submit_urb(urb, GFP_ATOMIC);
1263         if (status) {
1264                 // something went wrong
1265                 usb_free_urb(urb);
1266                 return status;
1267         }
1268 
1269 	if (!wait_event_timeout(awd.wqh, awd.done, timeout)) {
1270                 // timeout
1271                 dev_warn(&urb->dev->dev, "usb_control/bulk_msg: timeout\n");
1272                 usb_kill_urb(urb);  // remove urb safely
1273                 status = -ETIMEDOUT;
1274         }
1275 	else {
1276                 status = urb->status;
1277 	}
1278 
1279         if (actual_length) {
1280                 *actual_length = urb->actual_length;
1281 	}
1282 
1283         usb_free_urb(urb);
1284         return status;
1285 }
1286 
1287 /*-------------------------------------------------------------------*/
1288 // returns status (negative) or length (positive)
1289 static int kaweth_internal_control_msg(struct usb_device *usb_dev,
1290 				       unsigned int pipe,
1291 				       struct usb_ctrlrequest *cmd, void *data,
1292 				       int len, int timeout)
1293 {
1294         struct urb *urb;
1295         int retv;
1296         int length = 0; /* shut up GCC */
1297 
1298 	urb = usb_alloc_urb(0, GFP_ATOMIC);
1299         if (!urb)
1300                 return -ENOMEM;
1301 
1302         usb_fill_control_urb(urb, usb_dev, pipe, (unsigned char*)cmd, data,
1303 			 len, usb_api_blocking_completion, NULL);
1304 
1305         retv = usb_start_wait_urb(urb, timeout, &length);
1306         if (retv < 0) {
1307                 return retv;
1308 	}
1309         else {
1310                 return length;
1311 	}
1312 }
1313 
1314 module_usb_driver(kaweth_driver);
1315