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Merge tag 'v3.3.7' into 3.3/master
[zen-stable.git] / drivers / net / usb / kaweth.c
blobd034d9c42548b2b450b13c7b69ba3da81cb97904
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, write to the Free Software Foundation,
29 * Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA.
30 *
31 ****************************************************************/
32
33 /* TODO:
34 * Develop test procedures for USB net interfaces
35 * Run test procedures
36 * Fix bugs from previous two steps
37 * Snoop other OSs for any tricks we're not doing
38 * Reduce arbitrary timeouts
39 * Smart multicast support
40 * Temporary MAC change support
41 * Tunable SOFs parameter - ioctl()?
42 * Ethernet stats collection
43 * Code formatting improvements
44 */
45
46 #include <linux/module.h>
47 #include <linux/slab.h>
48 #include <linux/string.h>
49 #include <linux/init.h>
50 #include <linux/delay.h>
51 #include <linux/netdevice.h>
52 #include <linux/etherdevice.h>
53 #include <linux/usb.h>
54 #include <linux/types.h>
55 #include <linux/ethtool.h>
56 #include <linux/dma-mapping.h>
57 #include <linux/wait.h>
58 #include <linux/firmware.h>
59 #include <asm/uaccess.h>
60 #include <asm/byteorder.h>
61
62 #undef DEBUG
63
64 #define KAWETH_MTU 1514
65 #define KAWETH_BUF_SIZE 1664
66 #define KAWETH_TX_TIMEOUT (5 * HZ)
67 #define KAWETH_SCRATCH_SIZE 32
68 #define KAWETH_FIRMWARE_BUF_SIZE 4096
69 #define KAWETH_CONTROL_TIMEOUT (30000)
70
71 #define KAWETH_STATUS_BROKEN 0x0000001
72 #define KAWETH_STATUS_CLOSING 0x0000002
73 #define KAWETH_STATUS_SUSPENDING 0x0000004
74
75 #define KAWETH_STATUS_BLOCKED (KAWETH_STATUS_CLOSING | KAWETH_STATUS_SUSPENDING)
76
77 #define KAWETH_PACKET_FILTER_PROMISCUOUS 0x01
78 #define KAWETH_PACKET_FILTER_ALL_MULTICAST 0x02
79 #define KAWETH_PACKET_FILTER_DIRECTED 0x04
80 #define KAWETH_PACKET_FILTER_BROADCAST 0x08
81 #define KAWETH_PACKET_FILTER_MULTICAST 0x10
82
83 /* Table 7 */
84 #define KAWETH_COMMAND_GET_ETHERNET_DESC 0x00
85 #define KAWETH_COMMAND_MULTICAST_FILTERS 0x01
86 #define KAWETH_COMMAND_SET_PACKET_FILTER 0x02
87 #define KAWETH_COMMAND_STATISTICS 0x03
88 #define KAWETH_COMMAND_SET_TEMP_MAC 0x06
89 #define KAWETH_COMMAND_GET_TEMP_MAC 0x07
90 #define KAWETH_COMMAND_SET_URB_SIZE 0x08
91 #define KAWETH_COMMAND_SET_SOFS_WAIT 0x09
92 #define KAWETH_COMMAND_SCAN 0xFF
93
94 #define KAWETH_SOFS_TO_WAIT 0x05
95
96 #define INTBUFFERSIZE 4
97
98 #define STATE_OFFSET 0
99 #define STATE_MASK 0x40
100 #define STATE_SHIFT 5
101
102 #define IS_BLOCKED(s) (s & KAWETH_STATUS_BLOCKED)
103
104
105 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>");
106 MODULE_DESCRIPTION("KL5USB101 USB Ethernet driver");
107 MODULE_LICENSE("GPL");
108 MODULE_FIRMWARE("kaweth/new_code.bin");
109 MODULE_FIRMWARE("kaweth/new_code_fix.bin");
110 MODULE_FIRMWARE("kaweth/trigger_code.bin");
111 MODULE_FIRMWARE("kaweth/trigger_code_fix.bin");
112
113 static const char driver_name[] = "kaweth";
114
115 static int kaweth_probe(
116 struct usb_interface *intf,
117 const struct usb_device_id *id /* from id_table */
118 );
119 static void kaweth_disconnect(struct usb_interface *intf);
120 static int kaweth_internal_control_msg(struct usb_device *usb_dev,
121 unsigned int pipe,
122 struct usb_ctrlrequest *cmd, void *data,
123 int len, int timeout);
124 static int kaweth_suspend(struct usb_interface *intf, pm_message_t message);
125 static int kaweth_resume(struct usb_interface *intf);
126
127 /****************************************************************
128 * usb_device_id
129 ****************************************************************/
130 static struct usb_device_id usb_klsi_table[] = {
131 { USB_DEVICE(0x03e8, 0x0008) }, /* AOX Endpoints USB Ethernet */
132 { USB_DEVICE(0x04bb, 0x0901) }, /* I-O DATA USB-ET/T */
133 { USB_DEVICE(0x0506, 0x03e8) }, /* 3Com 3C19250 */
134 { USB_DEVICE(0x0506, 0x11f8) }, /* 3Com 3C460 */
135 { USB_DEVICE(0x0557, 0x2002) }, /* ATEN USB Ethernet */
136 { USB_DEVICE(0x0557, 0x4000) }, /* D-Link DSB-650C */
137 { USB_DEVICE(0x0565, 0x0002) }, /* Peracom Enet */
138 { USB_DEVICE(0x0565, 0x0003) }, /* Optus@Home UEP1045A */
139 { USB_DEVICE(0x0565, 0x0005) }, /* Peracom Enet2 */
140 { USB_DEVICE(0x05e9, 0x0008) }, /* KLSI KL5KUSB101B */
141 { USB_DEVICE(0x05e9, 0x0009) }, /* KLSI KL5KUSB101B (Board change) */
142 { USB_DEVICE(0x066b, 0x2202) }, /* Linksys USB10T */
143 { USB_DEVICE(0x06e1, 0x0008) }, /* ADS USB-10BT */
144 { USB_DEVICE(0x06e1, 0x0009) }, /* ADS USB-10BT */
145 { USB_DEVICE(0x0707, 0x0100) }, /* SMC 2202USB */
146 { USB_DEVICE(0x07aa, 0x0001) }, /* Correga K.K. */
147 { USB_DEVICE(0x07b8, 0x4000) }, /* D-Link DU-E10 */
148 { USB_DEVICE(0x07c9, 0xb010) }, /* Allied Telesyn AT-USB10 USB Ethernet Adapter */
149 { USB_DEVICE(0x0846, 0x1001) }, /* NetGear EA-101 */
150 { USB_DEVICE(0x0846, 0x1002) }, /* NetGear EA-101 */
151 { USB_DEVICE(0x085a, 0x0008) }, /* PortGear Ethernet Adapter */
152 { USB_DEVICE(0x085a, 0x0009) }, /* PortGear Ethernet Adapter */
153 { USB_DEVICE(0x087d, 0x5704) }, /* Jaton USB Ethernet Device Adapter */
154 { USB_DEVICE(0x0951, 0x0008) }, /* Kingston Technology USB Ethernet Adapter */
155 { USB_DEVICE(0x095a, 0x3003) }, /* Portsmith Express Ethernet Adapter */
156 { USB_DEVICE(0x10bd, 0x1427) }, /* ASANTE USB To Ethernet Adapter */
157 { USB_DEVICE(0x1342, 0x0204) }, /* Mobility USB-Ethernet Adapter */
158 { USB_DEVICE(0x13d2, 0x0400) }, /* Shark Pocket Adapter */
159 { USB_DEVICE(0x1485, 0x0001) }, /* Silicom U2E */
160 { USB_DEVICE(0x1485, 0x0002) }, /* Psion Dacom Gold Port Ethernet */
161 { USB_DEVICE(0x1645, 0x0005) }, /* Entrega E45 */
162 { USB_DEVICE(0x1645, 0x0008) }, /* Entrega USB Ethernet Adapter */
163 { USB_DEVICE(0x1645, 0x8005) }, /* PortGear Ethernet Adapter */
164 { USB_DEVICE(0x1668, 0x0323) }, /* Actiontec USB Ethernet */
165 { USB_DEVICE(0x2001, 0x4000) }, /* D-link DSB-650C */
166 {} /* Null terminator */
167 };
168
169 MODULE_DEVICE_TABLE (usb, usb_klsi_table);
170
171 /****************************************************************
172 * kaweth_driver
173 ****************************************************************/
174 static struct usb_driver kaweth_driver = {
175 .name = driver_name,
176 .probe = kaweth_probe,
177 .disconnect = kaweth_disconnect,
178 .suspend = kaweth_suspend,
179 .resume = kaweth_resume,
180 .id_table = usb_klsi_table,
181 .supports_autosuspend = 1,
182 };
183
184 typedef __u8 eth_addr_t[6];
185
186 /****************************************************************
187 * usb_eth_dev
188 ****************************************************************/
189 struct usb_eth_dev {
190 char *name;
191 __u16 vendor;
192 __u16 device;
193 void *pdata;
194 };
195
196 /****************************************************************
197 * kaweth_ethernet_configuration
198 * Refer Table 8
199 ****************************************************************/
200 struct kaweth_ethernet_configuration
201 {
202 __u8 size;
203 __u8 reserved1;
204 __u8 reserved2;
205 eth_addr_t hw_addr;
206 __u32 statistics_mask;
207 __le16 segment_size;
208 __u16 max_multicast_filters;
209 __u8 reserved3;
210 } __packed;
211
212 /****************************************************************
213 * kaweth_device
214 ****************************************************************/
215 struct kaweth_device
216 {
217 spinlock_t device_lock;
218
219 __u32 status;
220 int end;
221 int suspend_lowmem_rx;
222 int suspend_lowmem_ctrl;
223 int linkstate;
224 int opened;
225 struct delayed_work lowmem_work;
226
227 struct usb_device *dev;
228 struct usb_interface *intf;
229 struct net_device *net;
230 wait_queue_head_t term_wait;
231
232 struct urb *rx_urb;
233 struct urb *tx_urb;
234 struct urb *irq_urb;
235
236 dma_addr_t intbufferhandle;
237 __u8 *intbuffer;
238 dma_addr_t rxbufferhandle;
239 __u8 *rx_buf;
240
241
242 struct sk_buff *tx_skb;
243
244 __u8 *firmware_buf;
245 __u8 scratch[KAWETH_SCRATCH_SIZE];
246 __u16 packet_filter_bitmap;
247
248 struct kaweth_ethernet_configuration configuration;
249
250 struct net_device_stats stats;
251 };
252
253 /****************************************************************
254 * kaweth_control
255 ****************************************************************/
256 static int kaweth_control(struct kaweth_device *kaweth,
257 unsigned int pipe,
258 __u8 request,
259 __u8 requesttype,
260 __u16 value,
261 __u16 index,
262 void *data,
263 __u16 size,
264 int timeout)
265 {
266 struct usb_ctrlrequest *dr;
267 int retval;
268
269 dbg("kaweth_control()");
270
271 if(in_interrupt()) {
272 dbg("in_interrupt()");
273 return -EBUSY;
274 }
275
276 dr = kmalloc(sizeof(struct usb_ctrlrequest), GFP_ATOMIC);
277
278 if (!dr) {
279 dbg("kmalloc() failed");
280 return -ENOMEM;
281 }
282
283 dr->bRequestType = requesttype;
284 dr->bRequest = request;
285 dr->wValue = cpu_to_le16(value);
286 dr->wIndex = cpu_to_le16(index);
287 dr->wLength = cpu_to_le16(size);
288
289 retval = kaweth_internal_control_msg(kaweth->dev,
290 pipe,
291 dr,
292 data,
293 size,
294 timeout);
295
296 kfree(dr);
297 return retval;
298 }
299
300 /****************************************************************
301 * kaweth_read_configuration
302 ****************************************************************/
303 static int kaweth_read_configuration(struct kaweth_device *kaweth)
304 {
305 int retval;
306
307 dbg("Reading kaweth configuration");
308
309 retval = kaweth_control(kaweth,
310 usb_rcvctrlpipe(kaweth->dev, 0),
311 KAWETH_COMMAND_GET_ETHERNET_DESC,
312 USB_TYPE_VENDOR | USB_DIR_IN | USB_RECIP_DEVICE,
313 0,
314 0,
315 (void *)&kaweth->configuration,
316 sizeof(kaweth->configuration),
317 KAWETH_CONTROL_TIMEOUT);
318
319 return retval;
320 }
321
322 /****************************************************************
323 * kaweth_set_urb_size
324 ****************************************************************/
325 static int kaweth_set_urb_size(struct kaweth_device *kaweth, __u16 urb_size)
326 {
327 int retval;
328
329 dbg("Setting URB size to %d", (unsigned)urb_size);
330
331 retval = kaweth_control(kaweth,
332 usb_sndctrlpipe(kaweth->dev, 0),
333 KAWETH_COMMAND_SET_URB_SIZE,
334 USB_TYPE_VENDOR | USB_DIR_OUT | USB_RECIP_DEVICE,
335 urb_size,
336 0,
337 (void *)&kaweth->scratch,
338 0,
339 KAWETH_CONTROL_TIMEOUT);
340
341 return retval;
342 }
343
344 /****************************************************************
345 * kaweth_set_sofs_wait
346 ****************************************************************/
347 static int kaweth_set_sofs_wait(struct kaweth_device *kaweth, __u16 sofs_wait)
348 {
349 int retval;
350
351 dbg("Set SOFS wait to %d", (unsigned)sofs_wait);
352
353 retval = kaweth_control(kaweth,
354 usb_sndctrlpipe(kaweth->dev, 0),
355 KAWETH_COMMAND_SET_SOFS_WAIT,
356 USB_TYPE_VENDOR | USB_DIR_OUT | USB_RECIP_DEVICE,
357 sofs_wait,
358 0,
359 (void *)&kaweth->scratch,
360 0,
361 KAWETH_CONTROL_TIMEOUT);
362
363 return retval;
364 }
365
366 /****************************************************************
367 * kaweth_set_receive_filter
368 ****************************************************************/
369 static int kaweth_set_receive_filter(struct kaweth_device *kaweth,
370 __u16 receive_filter)
371 {
372 int retval;
373
374 dbg("Set receive filter to %d", (unsigned)receive_filter);
375
376 retval = kaweth_control(kaweth,
377 usb_sndctrlpipe(kaweth->dev, 0),
378 KAWETH_COMMAND_SET_PACKET_FILTER,
379 USB_TYPE_VENDOR | USB_DIR_OUT | USB_RECIP_DEVICE,
380 receive_filter,
381 0,
382 (void *)&kaweth->scratch,
383 0,
384 KAWETH_CONTROL_TIMEOUT);
385
386 return retval;
387 }
388
389 /****************************************************************
390 * kaweth_download_firmware
391 ****************************************************************/
392 static int kaweth_download_firmware(struct kaweth_device *kaweth,
393 const char *fwname,
394 __u8 interrupt,
395 __u8 type)
396 {
397 const struct firmware *fw;
398 int data_len;
399 int ret;
400
401 ret = request_firmware(&fw, fwname, &kaweth->dev->dev);
402 if (ret) {
403 err("Firmware request failed\n");
404 return ret;
405 }
406
407 if (fw->size > KAWETH_FIRMWARE_BUF_SIZE) {
408 err("Firmware too big: %zu", fw->size);
409 release_firmware(fw);
410 return -ENOSPC;
411 }
412 data_len = fw->size;
413 memcpy(kaweth->firmware_buf, fw->data, fw->size);
414
415 release_firmware(fw);
416
417 kaweth->firmware_buf[2] = (data_len & 0xFF) - 7;
418 kaweth->firmware_buf[3] = data_len >> 8;
419 kaweth->firmware_buf[4] = type;
420 kaweth->firmware_buf[5] = interrupt;
421
422 dbg("High: %i, Low:%i", kaweth->firmware_buf[3],
423 kaweth->firmware_buf[2]);
424
425 dbg("Downloading firmware at %p to kaweth device at %p",
426 fw->data, kaweth);
427 dbg("Firmware length: %d", data_len);
428
429 return kaweth_control(kaweth,
430 usb_sndctrlpipe(kaweth->dev, 0),
431 KAWETH_COMMAND_SCAN,
432 USB_TYPE_VENDOR | USB_DIR_OUT | USB_RECIP_DEVICE,
433 0,
434 0,
435 (void *)kaweth->firmware_buf,
436 data_len,
437 KAWETH_CONTROL_TIMEOUT);
438 }
439
440 /****************************************************************
441 * kaweth_trigger_firmware
442 ****************************************************************/
443 static int kaweth_trigger_firmware(struct kaweth_device *kaweth,
444 __u8 interrupt)
445 {
446 kaweth->firmware_buf[0] = 0xB6;
447 kaweth->firmware_buf[1] = 0xC3;
448 kaweth->firmware_buf[2] = 0x01;
449 kaweth->firmware_buf[3] = 0x00;
450 kaweth->firmware_buf[4] = 0x06;
451 kaweth->firmware_buf[5] = interrupt;
452 kaweth->firmware_buf[6] = 0x00;
453 kaweth->firmware_buf[7] = 0x00;
454
455 dbg("Triggering firmware");
456
457 return kaweth_control(kaweth,
458 usb_sndctrlpipe(kaweth->dev, 0),
459 KAWETH_COMMAND_SCAN,
460 USB_TYPE_VENDOR | USB_DIR_OUT | USB_RECIP_DEVICE,
461 0,
462 0,
463 (void *)kaweth->firmware_buf,
464 8,
465 KAWETH_CONTROL_TIMEOUT);
466 }
467
468 /****************************************************************
469 * kaweth_reset
470 ****************************************************************/
471 static int kaweth_reset(struct kaweth_device *kaweth)
472 {
473 int result;
474
475 dbg("kaweth_reset(%p)", kaweth);
476 result = usb_reset_configuration(kaweth->dev);
477 mdelay(10);
478
479 dbg("kaweth_reset() returns %d.",result);
480
481 return result;
482 }
483
484 static void kaweth_usb_receive(struct urb *);
485 static int kaweth_resubmit_rx_urb(struct kaweth_device *, gfp_t);
486
487 /****************************************************************
488 int_callback
489 *****************************************************************/
490
491 static void kaweth_resubmit_int_urb(struct kaweth_device *kaweth, gfp_t mf)
492 {
493 int status;
494
495 status = usb_submit_urb (kaweth->irq_urb, mf);
496 if (unlikely(status == -ENOMEM)) {
497 kaweth->suspend_lowmem_ctrl = 1;
498 schedule_delayed_work(&kaweth->lowmem_work, HZ/4);
499 } else {
500 kaweth->suspend_lowmem_ctrl = 0;
501 }
502
503 if (status)
504 err ("can't resubmit intr, %s-%s, status %d",
505 kaweth->dev->bus->bus_name,
506 kaweth->dev->devpath, status);
507 }
508
509 static void int_callback(struct urb *u)
510 {
511 struct kaweth_device *kaweth = u->context;
512 int act_state;
513 int status = u->status;
514
515 switch (status) {
516 case 0: /* success */
517 break;
518 case -ECONNRESET: /* unlink */
519 case -ENOENT:
520 case -ESHUTDOWN:
521 return;
522 /* -EPIPE: should clear the halt */
523 default: /* error */
524 goto resubmit;
525 }
526
527 /* we check the link state to report changes */
528 if (kaweth->linkstate != (act_state = ( kaweth->intbuffer[STATE_OFFSET] | STATE_MASK) >> STATE_SHIFT)) {
529 if (act_state)
530 netif_carrier_on(kaweth->net);
531 else
532 netif_carrier_off(kaweth->net);
533
534 kaweth->linkstate = act_state;
535 }
536 resubmit:
537 kaweth_resubmit_int_urb(kaweth, GFP_ATOMIC);
538 }
539
540 static void kaweth_resubmit_tl(struct work_struct *work)
541 {
542 struct kaweth_device *kaweth =
543 container_of(work, struct kaweth_device, lowmem_work.work);
544
545 if (IS_BLOCKED(kaweth->status))
546 return;
547
548 if (kaweth->suspend_lowmem_rx)
549 kaweth_resubmit_rx_urb(kaweth, GFP_NOIO);
550
551 if (kaweth->suspend_lowmem_ctrl)
552 kaweth_resubmit_int_urb(kaweth, GFP_NOIO);
553 }
554
555
556 /****************************************************************
557 * kaweth_resubmit_rx_urb
558 ****************************************************************/
559 static int kaweth_resubmit_rx_urb(struct kaweth_device *kaweth,
560 gfp_t mem_flags)
561 {
562 int result;
563
564 usb_fill_bulk_urb(kaweth->rx_urb,
565 kaweth->dev,
566 usb_rcvbulkpipe(kaweth->dev, 1),
567 kaweth->rx_buf,
568 KAWETH_BUF_SIZE,
569 kaweth_usb_receive,
570 kaweth);
571 kaweth->rx_urb->transfer_flags |= URB_NO_TRANSFER_DMA_MAP;
572 kaweth->rx_urb->transfer_dma = kaweth->rxbufferhandle;
573
574 if((result = usb_submit_urb(kaweth->rx_urb, mem_flags))) {
575 if (result == -ENOMEM) {
576 kaweth->suspend_lowmem_rx = 1;
577 schedule_delayed_work(&kaweth->lowmem_work, HZ/4);
578 }
579 err("resubmitting rx_urb %d failed", result);
580 } else {
581 kaweth->suspend_lowmem_rx = 0;
582 }
583
584 return result;
585 }
586
587 static void kaweth_async_set_rx_mode(struct kaweth_device *kaweth);
588
589 /****************************************************************
590 * kaweth_usb_receive
591 ****************************************************************/
592 static void kaweth_usb_receive(struct urb *urb)
593 {
594 struct kaweth_device *kaweth = urb->context;
595 struct net_device *net = kaweth->net;
596 int status = urb->status;
597
598 int count = urb->actual_length;
599 int count2 = urb->transfer_buffer_length;
600
601 __u16 pkt_len = le16_to_cpup((__le16 *)kaweth->rx_buf);
602
603 struct sk_buff *skb;
604
605 if (unlikely(status == -EPIPE)) {
606 kaweth->stats.rx_errors++;
607 kaweth->end = 1;
608 wake_up(&kaweth->term_wait);
609 dbg("Status was -EPIPE.");
610 return;
611 }
612 if (unlikely(status == -ECONNRESET || status == -ESHUTDOWN)) {
613 /* we are killed - set a flag and wake the disconnect handler */
614 kaweth->end = 1;
615 wake_up(&kaweth->term_wait);
616 dbg("Status was -ECONNRESET or -ESHUTDOWN.");
617 return;
618 }
619 if (unlikely(status == -EPROTO || status == -ETIME ||
620 status == -EILSEQ)) {
621 kaweth->stats.rx_errors++;
622 dbg("Status was -EPROTO, -ETIME, or -EILSEQ.");
623 return;
624 }
625 if (unlikely(status == -EOVERFLOW)) {
626 kaweth->stats.rx_errors++;
627 dbg("Status was -EOVERFLOW.");
628 }
629 spin_lock(&kaweth->device_lock);
630 if (IS_BLOCKED(kaweth->status)) {
631 spin_unlock(&kaweth->device_lock);
632 return;
633 }
634 spin_unlock(&kaweth->device_lock);
635
636 if(status && status != -EREMOTEIO && count != 1) {
637 err("%s RX status: %d count: %d packet_len: %d",
638 net->name,
639 status,
640 count,
641 (int)pkt_len);
642 kaweth_resubmit_rx_urb(kaweth, GFP_ATOMIC);
643 return;
644 }
645
646 if(kaweth->net && (count > 2)) {
647 if(pkt_len > (count - 2)) {
648 err("Packet length too long for USB frame (pkt_len: %x, count: %x)",pkt_len, count);
649 err("Packet len & 2047: %x", pkt_len & 2047);
650 err("Count 2: %x", count2);
651 kaweth_resubmit_rx_urb(kaweth, GFP_ATOMIC);
652 return;
653 }
654
655 if(!(skb = dev_alloc_skb(pkt_len+2))) {
656 kaweth_resubmit_rx_urb(kaweth, GFP_ATOMIC);
657 return;
658 }
659
660 skb_reserve(skb, 2); /* Align IP on 16 byte boundaries */
661
662 skb_copy_to_linear_data(skb, kaweth->rx_buf + 2, pkt_len);
663
664 skb_put(skb, pkt_len);
665
666 skb->protocol = eth_type_trans(skb, net);
667
668 netif_rx(skb);
669
670 kaweth->stats.rx_packets++;
671 kaweth->stats.rx_bytes += pkt_len;
672 }
673
674 kaweth_resubmit_rx_urb(kaweth, GFP_ATOMIC);
675 }
676
677 /****************************************************************
678 * kaweth_open
679 ****************************************************************/
680 static int kaweth_open(struct net_device *net)
681 {
682 struct kaweth_device *kaweth = netdev_priv(net);
683 int res;
684
685 dbg("Opening network device.");
686
687 res = usb_autopm_get_interface(kaweth->intf);
688 if (res) {
689 err("Interface cannot be resumed.");
690 return -EIO;
691 }
692 res = kaweth_resubmit_rx_urb(kaweth, GFP_KERNEL);
693 if (res)
694 goto err_out;
695
696 usb_fill_int_urb(
697 kaweth->irq_urb,
698 kaweth->dev,
699 usb_rcvintpipe(kaweth->dev, 3),
700 kaweth->intbuffer,
701 INTBUFFERSIZE,
702 int_callback,
703 kaweth,
704 250); /* overriding the descriptor */
705 kaweth->irq_urb->transfer_dma = kaweth->intbufferhandle;
706 kaweth->irq_urb->transfer_flags |= URB_NO_TRANSFER_DMA_MAP;
707
708 res = usb_submit_urb(kaweth->irq_urb, GFP_KERNEL);
709 if (res) {
710 usb_kill_urb(kaweth->rx_urb);
711 goto err_out;
712 }
713 kaweth->opened = 1;
714
715 netif_start_queue(net);
716
717 kaweth_async_set_rx_mode(kaweth);
718 return 0;
719
720 err_out:
721 usb_autopm_put_interface(kaweth->intf);
722 return -EIO;
723 }
724
725 /****************************************************************
726 * kaweth_kill_urbs
727 ****************************************************************/
728 static void kaweth_kill_urbs(struct kaweth_device *kaweth)
729 {
730 usb_kill_urb(kaweth->irq_urb);
731 usb_kill_urb(kaweth->rx_urb);
732 usb_kill_urb(kaweth->tx_urb);
733
734 cancel_delayed_work_sync(&kaweth->lowmem_work);
735
736 /* a scheduled work may have resubmitted,
737 we hit them again */
738 usb_kill_urb(kaweth->irq_urb);
739 usb_kill_urb(kaweth->rx_urb);
740 }
741
742 /****************************************************************
743 * kaweth_close
744 ****************************************************************/
745 static int kaweth_close(struct net_device *net)
746 {
747 struct kaweth_device *kaweth = netdev_priv(net);
748
749 netif_stop_queue(net);
750 kaweth->opened = 0;
751
752 kaweth->status |= KAWETH_STATUS_CLOSING;
753
754 kaweth_kill_urbs(kaweth);
755
756 kaweth->status &= ~KAWETH_STATUS_CLOSING;
757
758 usb_autopm_put_interface(kaweth->intf);
759
760 return 0;
761 }
762
763 static u32 kaweth_get_link(struct net_device *dev)
764 {
765 struct kaweth_device *kaweth = netdev_priv(dev);
766
767 return kaweth->linkstate;
768 }
769
770 static const struct ethtool_ops ops = {
771 .get_link = kaweth_get_link
772 };
773
774 /****************************************************************
775 * kaweth_usb_transmit_complete
776 ****************************************************************/
777 static void kaweth_usb_transmit_complete(struct urb *urb)
778 {
779 struct kaweth_device *kaweth = urb->context;
780 struct sk_buff *skb = kaweth->tx_skb;
781 int status = urb->status;
782
783 if (unlikely(status != 0))
784 if (status != -ENOENT)
785 dbg("%s: TX status %d.", kaweth->net->name, status);
786
787 netif_wake_queue(kaweth->net);
788 dev_kfree_skb_irq(skb);
789 }
790
791 /****************************************************************
792 * kaweth_start_xmit
793 ****************************************************************/
794 static netdev_tx_t kaweth_start_xmit(struct sk_buff *skb,
795 struct net_device *net)
796 {
797 struct kaweth_device *kaweth = netdev_priv(net);
798 __le16 *private_header;
799
800 int res;
801
802 spin_lock_irq(&kaweth->device_lock);
803
804 kaweth_async_set_rx_mode(kaweth);
805 netif_stop_queue(net);
806 if (IS_BLOCKED(kaweth->status)) {
807 goto skip;
808 }
809
810 /* We now decide whether we can put our special header into the sk_buff */
811 if (skb_cloned(skb) || skb_headroom(skb) < 2) {
812 /* no such luck - we make our own */
813 struct sk_buff *copied_skb;
814 copied_skb = skb_copy_expand(skb, 2, 0, GFP_ATOMIC);
815 dev_kfree_skb_irq(skb);
816 skb = copied_skb;
817 if (!copied_skb) {
818 kaweth->stats.tx_errors++;
819 netif_start_queue(net);
820 spin_unlock_irq(&kaweth->device_lock);
821 return NETDEV_TX_OK;
822 }
823 }
824
825 private_header = (__le16 *)__skb_push(skb, 2);
826 *private_header = cpu_to_le16(skb->len-2);
827 kaweth->tx_skb = skb;
828
829 usb_fill_bulk_urb(kaweth->tx_urb,
830 kaweth->dev,
831 usb_sndbulkpipe(kaweth->dev, 2),
832 private_header,
833 skb->len,
834 kaweth_usb_transmit_complete,
835 kaweth);
836 kaweth->end = 0;
837
838 if((res = usb_submit_urb(kaweth->tx_urb, GFP_ATOMIC)))
839 {
840 dev_warn(&net->dev, "kaweth failed tx_urb %d\n", res);
841 skip:
842 kaweth->stats.tx_errors++;
843
844 netif_start_queue(net);
845 dev_kfree_skb_irq(skb);
846 }
847 else
848 {
849 kaweth->stats.tx_packets++;
850 kaweth->stats.tx_bytes += skb->len;
851 }
852
853 spin_unlock_irq(&kaweth->device_lock);
854
855 return NETDEV_TX_OK;
856 }
857
858 /****************************************************************
859 * kaweth_set_rx_mode
860 ****************************************************************/
861 static void kaweth_set_rx_mode(struct net_device *net)
862 {
863 struct kaweth_device *kaweth = netdev_priv(net);
864
865 __u16 packet_filter_bitmap = KAWETH_PACKET_FILTER_DIRECTED |
866 KAWETH_PACKET_FILTER_BROADCAST |
867 KAWETH_PACKET_FILTER_MULTICAST;
868
869 dbg("Setting Rx mode to %d", packet_filter_bitmap);
870
871 netif_stop_queue(net);
872
873 if (net->flags & IFF_PROMISC) {
874 packet_filter_bitmap |= KAWETH_PACKET_FILTER_PROMISCUOUS;
875 }
876 else if (!netdev_mc_empty(net) || (net->flags & IFF_ALLMULTI)) {
877 packet_filter_bitmap |= KAWETH_PACKET_FILTER_ALL_MULTICAST;
878 }
879
880 kaweth->packet_filter_bitmap = packet_filter_bitmap;
881 netif_wake_queue(net);
882 }
883
884 /****************************************************************
885 * kaweth_async_set_rx_mode
886 ****************************************************************/
887 static void kaweth_async_set_rx_mode(struct kaweth_device *kaweth)
888 {
889 int result;
890 __u16 packet_filter_bitmap = kaweth->packet_filter_bitmap;
891
892 kaweth->packet_filter_bitmap = 0;
893 if (packet_filter_bitmap == 0)
894 return;
895
896 if (in_interrupt())
897 return;
898
899 result = kaweth_control(kaweth,
900 usb_sndctrlpipe(kaweth->dev, 0),
901 KAWETH_COMMAND_SET_PACKET_FILTER,
902 USB_TYPE_VENDOR | USB_DIR_OUT | USB_RECIP_DEVICE,
903 packet_filter_bitmap,
904 0,
905 (void *)&kaweth->scratch,
906 0,
907 KAWETH_CONTROL_TIMEOUT);
908
909 if(result < 0) {
910 err("Failed to set Rx mode: %d", result);
911 }
912 else {
913 dbg("Set Rx mode to %d", packet_filter_bitmap);
914 }
915 }
916
917 /****************************************************************
918 * kaweth_netdev_stats
919 ****************************************************************/
920 static struct net_device_stats *kaweth_netdev_stats(struct net_device *dev)
921 {
922 struct kaweth_device *kaweth = netdev_priv(dev);
923 return &kaweth->stats;
924 }
925
926 /****************************************************************
927 * kaweth_tx_timeout
928 ****************************************************************/
929 static void kaweth_tx_timeout(struct net_device *net)
930 {
931 struct kaweth_device *kaweth = netdev_priv(net);
932
933 dev_warn(&net->dev, "%s: Tx timed out. Resetting.\n", net->name);
934 kaweth->stats.tx_errors++;
935 net->trans_start = jiffies;
936
937 usb_unlink_urb(kaweth->tx_urb);
938 }
939
940 /****************************************************************
941 * kaweth_suspend
942 ****************************************************************/
943 static int kaweth_suspend(struct usb_interface *intf, pm_message_t message)
944 {
945 struct kaweth_device *kaweth = usb_get_intfdata(intf);
946 unsigned long flags;
947
948 dbg("Suspending device");
949 spin_lock_irqsave(&kaweth->device_lock, flags);
950 kaweth->status |= KAWETH_STATUS_SUSPENDING;
951 spin_unlock_irqrestore(&kaweth->device_lock, flags);
952
953 kaweth_kill_urbs(kaweth);
954 return 0;
955 }
956
957 /****************************************************************
958 * kaweth_resume
959 ****************************************************************/
960 static int kaweth_resume(struct usb_interface *intf)
961 {
962 struct kaweth_device *kaweth = usb_get_intfdata(intf);
963 unsigned long flags;
964
965 dbg("Resuming device");
966 spin_lock_irqsave(&kaweth->device_lock, flags);
967 kaweth->status &= ~KAWETH_STATUS_SUSPENDING;
968 spin_unlock_irqrestore(&kaweth->device_lock, flags);
969
970 if (!kaweth->opened)
971 return 0;
972 kaweth_resubmit_rx_urb(kaweth, GFP_NOIO);
973 kaweth_resubmit_int_urb(kaweth, GFP_NOIO);
974
975 return 0;
976 }
977
978 /****************************************************************
979 * kaweth_probe
980 ****************************************************************/
981
982
983 static const struct net_device_ops kaweth_netdev_ops = {
984 .ndo_open = kaweth_open,
985 .ndo_stop = kaweth_close,
986 .ndo_start_xmit = kaweth_start_xmit,
987 .ndo_tx_timeout = kaweth_tx_timeout,
988 .ndo_set_rx_mode = kaweth_set_rx_mode,
989 .ndo_get_stats = kaweth_netdev_stats,
990 .ndo_change_mtu = eth_change_mtu,
991 .ndo_set_mac_address = eth_mac_addr,
992 .ndo_validate_addr = eth_validate_addr,
993 };
994
995 static int kaweth_probe(
996 struct usb_interface *intf,
997 const struct usb_device_id *id /* from id_table */
998 )
999 {
1000 struct usb_device *dev = interface_to_usbdev(intf);
1001 struct kaweth_device *kaweth;
1002 struct net_device *netdev;
1003 const eth_addr_t bcast_addr = { 0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF };
1004 int result = 0;
1005
1006 dbg("Kawasaki Device Probe (Device number:%d): 0x%4.4x:0x%4.4x:0x%4.4x",
1007 dev->devnum,
1008 le16_to_cpu(dev->descriptor.idVendor),
1009 le16_to_cpu(dev->descriptor.idProduct),
1010 le16_to_cpu(dev->descriptor.bcdDevice));
1011
1012 dbg("Device at %p", dev);
1013
1014 dbg("Descriptor length: %x type: %x",
1015 (int)dev->descriptor.bLength,
1016 (int)dev->descriptor.bDescriptorType);
1017
1018 netdev = alloc_etherdev(sizeof(*kaweth));
1019 if (!netdev)
1020 return -ENOMEM;
1021
1022 kaweth = netdev_priv(netdev);
1023 kaweth->dev = dev;
1024 kaweth->net = netdev;
1025
1026 spin_lock_init(&kaweth->device_lock);
1027 init_waitqueue_head(&kaweth->term_wait);
1028
1029 dbg("Resetting.");
1030
1031 kaweth_reset(kaweth);
1032
1033 /*
1034 * If high byte of bcdDevice is nonzero, firmware is already
1035 * downloaded. Don't try to do it again, or we'll hang the device.
1036 */
1037
1038 if (le16_to_cpu(dev->descriptor.bcdDevice) >> 8) {
1039 dev_info(&intf->dev, "Firmware present in device.\n");
1040 } else {
1041 /* Download the firmware */
1042 dev_info(&intf->dev, "Downloading firmware...\n");
1043 kaweth->firmware_buf = (__u8 *)__get_free_page(GFP_KERNEL);
1044 if ((result = kaweth_download_firmware(kaweth,
1045 "kaweth/new_code.bin",
1046 100,
1047 2)) < 0) {
1048 err("Error downloading firmware (%d)", result);
1049 goto err_fw;
1050 }
1051
1052 if ((result = kaweth_download_firmware(kaweth,
1053 "kaweth/new_code_fix.bin",
1054 100,
1055 3)) < 0) {
1056 err("Error downloading firmware fix (%d)", result);
1057 goto err_fw;
1058 }
1059
1060 if ((result = kaweth_download_firmware(kaweth,
1061 "kaweth/trigger_code.bin",
1062 126,
1063 2)) < 0) {
1064 err("Error downloading trigger code (%d)", result);
1065 goto err_fw;
1066
1067 }
1068
1069 if ((result = kaweth_download_firmware(kaweth,
1070 "kaweth/trigger_code_fix.bin",
1071 126,
1072 3)) < 0) {
1073 err("Error downloading trigger code fix (%d)", result);
1074 goto err_fw;
1075 }
1076
1077
1078 if ((result = kaweth_trigger_firmware(kaweth, 126)) < 0) {
1079 err("Error triggering firmware (%d)", result);
1080 goto err_fw;
1081 }
1082
1083 /* Device will now disappear for a moment... */
1084 dev_info(&intf->dev, "Firmware loaded. I'll be back...\n");
1085 err_fw:
1086 free_page((unsigned long)kaweth->firmware_buf);
1087 free_netdev(netdev);
1088 return -EIO;
1089 }
1090
1091 result = kaweth_read_configuration(kaweth);
1092
1093 if(result < 0) {
1094 err("Error reading configuration (%d), no net device created", result);
1095 goto err_free_netdev;
1096 }
1097
1098 dev_info(&intf->dev, "Statistics collection: %x\n", kaweth->configuration.statistics_mask);
1099 dev_info(&intf->dev, "Multicast filter limit: %x\n", kaweth->configuration.max_multicast_filters & ((1 << 15) - 1));
1100 dev_info(&intf->dev, "MTU: %d\n", le16_to_cpu(kaweth->configuration.segment_size));
1101 dev_info(&intf->dev, "Read MAC address %2.2x:%2.2x:%2.2x:%2.2x:%2.2x:%2.2x\n",
1102 (int)kaweth->configuration.hw_addr[0],
1103 (int)kaweth->configuration.hw_addr[1],
1104 (int)kaweth->configuration.hw_addr[2],
1105 (int)kaweth->configuration.hw_addr[3],
1106 (int)kaweth->configuration.hw_addr[4],
1107 (int)kaweth->configuration.hw_addr[5]);
1108
1109 if(!memcmp(&kaweth->configuration.hw_addr,
1110 &bcast_addr,
1111 sizeof(bcast_addr))) {
1112 err("Firmware not functioning properly, no net device created");
1113 goto err_free_netdev;
1114 }
1115
1116 if(kaweth_set_urb_size(kaweth, KAWETH_BUF_SIZE) < 0) {
1117 dbg("Error setting URB size");
1118 goto err_free_netdev;
1119 }
1120
1121 if(kaweth_set_sofs_wait(kaweth, KAWETH_SOFS_TO_WAIT) < 0) {
1122 err("Error setting SOFS wait");
1123 goto err_free_netdev;
1124 }
1125
1126 result = kaweth_set_receive_filter(kaweth,
1127 KAWETH_PACKET_FILTER_DIRECTED |
1128 KAWETH_PACKET_FILTER_BROADCAST |
1129 KAWETH_PACKET_FILTER_MULTICAST);
1130
1131 if(result < 0) {
1132 err("Error setting receive filter");
1133 goto err_free_netdev;
1134 }
1135
1136 dbg("Initializing net device.");
1137
1138 kaweth->intf = intf;
1139
1140 kaweth->tx_urb = usb_alloc_urb(0, GFP_KERNEL);
1141 if (!kaweth->tx_urb)
1142 goto err_free_netdev;
1143 kaweth->rx_urb = usb_alloc_urb(0, GFP_KERNEL);
1144 if (!kaweth->rx_urb)
1145 goto err_only_tx;
1146 kaweth->irq_urb = usb_alloc_urb(0, GFP_KERNEL);
1147 if (!kaweth->irq_urb)
1148 goto err_tx_and_rx;
1149
1150 kaweth->intbuffer = usb_alloc_coherent( kaweth->dev,
1151 INTBUFFERSIZE,
1152 GFP_KERNEL,
1153 &kaweth->intbufferhandle);
1154 if (!kaweth->intbuffer)
1155 goto err_tx_and_rx_and_irq;
1156 kaweth->rx_buf = usb_alloc_coherent( kaweth->dev,
1157 KAWETH_BUF_SIZE,
1158 GFP_KERNEL,
1159 &kaweth->rxbufferhandle);
1160 if (!kaweth->rx_buf)
1161 goto err_all_but_rxbuf;
1162
1163 memcpy(netdev->broadcast, &bcast_addr, sizeof(bcast_addr));
1164 memcpy(netdev->dev_addr, &kaweth->configuration.hw_addr,
1165 sizeof(kaweth->configuration.hw_addr));
1166
1167 netdev->netdev_ops = &kaweth_netdev_ops;
1168 netdev->watchdog_timeo = KAWETH_TX_TIMEOUT;
1169 netdev->mtu = le16_to_cpu(kaweth->configuration.segment_size);
1170 SET_ETHTOOL_OPS(netdev, &ops);
1171
1172 /* kaweth is zeroed as part of alloc_netdev */
1173 INIT_DELAYED_WORK(&kaweth->lowmem_work, kaweth_resubmit_tl);
1174 usb_set_intfdata(intf, kaweth);
1175
1176 #if 0
1177 // dma_supported() is deeply broken on almost all architectures
1178 if (dma_supported (&intf->dev, 0xffffffffffffffffULL))
1179 kaweth->net->features |= NETIF_F_HIGHDMA;
1180 #endif
1181
1182 SET_NETDEV_DEV(netdev, &intf->dev);
1183 if (register_netdev(netdev) != 0) {
1184 err("Error registering netdev.");
1185 goto err_intfdata;
1186 }
1187
1188 dev_info(&intf->dev, "kaweth interface created at %s\n",
1189 kaweth->net->name);
1190
1191 dbg("Kaweth probe returning.");
1192
1193 return 0;
1194
1195 err_intfdata:
1196 usb_set_intfdata(intf, NULL);
1197 usb_free_coherent(kaweth->dev, KAWETH_BUF_SIZE, (void *)kaweth->rx_buf, kaweth->rxbufferhandle);
1198 err_all_but_rxbuf:
1199 usb_free_coherent(kaweth->dev, INTBUFFERSIZE, (void *)kaweth->intbuffer, kaweth->intbufferhandle);
1200 err_tx_and_rx_and_irq:
1201 usb_free_urb(kaweth->irq_urb);
1202 err_tx_and_rx:
1203 usb_free_urb(kaweth->rx_urb);
1204 err_only_tx:
1205 usb_free_urb(kaweth->tx_urb);
1206 err_free_netdev:
1207 free_netdev(netdev);
1208
1209 return -EIO;
1210 }
1211
1212 /****************************************************************
1213 * kaweth_disconnect
1214 ****************************************************************/
1215 static void kaweth_disconnect(struct usb_interface *intf)
1216 {
1217 struct kaweth_device *kaweth = usb_get_intfdata(intf);
1218 struct net_device *netdev;
1219
1220 dev_info(&intf->dev, "Unregistering\n");
1221
1222 usb_set_intfdata(intf, NULL);
1223 if (!kaweth) {
1224 dev_warn(&intf->dev, "unregistering non-existent device\n");
1225 return;
1226 }
1227 netdev = kaweth->net;
1228
1229 dbg("Unregistering net device");
1230 unregister_netdev(netdev);
1231
1232 usb_free_urb(kaweth->rx_urb);
1233 usb_free_urb(kaweth->tx_urb);
1234 usb_free_urb(kaweth->irq_urb);
1235
1236 usb_free_coherent(kaweth->dev, KAWETH_BUF_SIZE, (void *)kaweth->rx_buf, kaweth->rxbufferhandle);
1237 usb_free_coherent(kaweth->dev, INTBUFFERSIZE, (void *)kaweth->intbuffer, kaweth->intbufferhandle);
1238
1239 free_netdev(netdev);
1240 }
1241
1242
1243 // FIXME this completion stuff is a modified clone of
1244 // an OLD version of some stuff in usb.c ...
1245 struct usb_api_data {
1246 wait_queue_head_t wqh;
1247 int done;
1248 };
1249
1250 /*-------------------------------------------------------------------*
1251 * completion handler for compatibility wrappers (sync control/bulk) *
1252 *-------------------------------------------------------------------*/
1253 static void usb_api_blocking_completion(struct urb *urb)
1254 {
1255 struct usb_api_data *awd = (struct usb_api_data *)urb->context;
1256
1257 awd->done=1;
1258 wake_up(&awd->wqh);
1259 }
1260
1261 /*-------------------------------------------------------------------*
1262 * COMPATIBILITY STUFF *
1263 *-------------------------------------------------------------------*/
1264
1265 // Starts urb and waits for completion or timeout
1266 static int usb_start_wait_urb(struct urb *urb, int timeout, int* actual_length)
1267 {
1268 struct usb_api_data awd;
1269 int status;
1270
1271 init_waitqueue_head(&awd.wqh);
1272 awd.done = 0;
1273
1274 urb->context = &awd;
1275 status = usb_submit_urb(urb, GFP_NOIO);
1276 if (status) {
1277 // something went wrong
1278 usb_free_urb(urb);
1279 return status;
1280 }
1281
1282 if (!wait_event_timeout(awd.wqh, awd.done, timeout)) {
1283 // timeout
1284 dev_warn(&urb->dev->dev, "usb_control/bulk_msg: timeout\n");
1285 usb_kill_urb(urb); // remove urb safely
1286 status = -ETIMEDOUT;
1287 }
1288 else {
1289 status = urb->status;
1290 }
1291
1292 if (actual_length) {
1293 *actual_length = urb->actual_length;
1294 }
1295
1296 usb_free_urb(urb);
1297 return status;
1298 }
1299
1300 /*-------------------------------------------------------------------*/
1301 // returns status (negative) or length (positive)
1302 static int kaweth_internal_control_msg(struct usb_device *usb_dev,
1303 unsigned int pipe,
1304 struct usb_ctrlrequest *cmd, void *data,
1305 int len, int timeout)
1306 {
1307 struct urb *urb;
1308 int retv;
1309 int length = 0; /* shut up GCC */
1310
1311 urb = usb_alloc_urb(0, GFP_NOIO);
1312 if (!urb)
1313 return -ENOMEM;
1314
1315 usb_fill_control_urb(urb, usb_dev, pipe, (unsigned char*)cmd, data,
1316 len, usb_api_blocking_completion, NULL);
1317
1318 retv = usb_start_wait_urb(urb, timeout, &length);
1319 if (retv < 0) {
1320 return retv;
1321 }
1322 else {
1323 return length;
1324 }
1325 }
1326
1327 module_usb_driver(kaweth_driver);