Version:  2.0.40 2.2.26 2.4.37 3.1 3.2 3.3 3.4 3.5 3.6 3.7 3.8 3.9 3.10 3.11 3.12 3.13 3.14 3.15 3.16 3.17

Linux/drivers/net/usb/kaweth.c

  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         netdev_dbg(kaweth->net, "kaweth_control()\n");
269 
270         if(in_interrupt()) {
271                 netdev_dbg(kaweth->net, "in_interrupt()\n");
272                 return -EBUSY;
273         }
274 
275         dr = kmalloc(sizeof(struct usb_ctrlrequest), GFP_ATOMIC);
276         if (!dr)
277                 return -ENOMEM;
278 
279         dr->bRequestType = requesttype;
280         dr->bRequest = request;
281         dr->wValue = cpu_to_le16(value);
282         dr->wIndex = cpu_to_le16(index);
283         dr->wLength = cpu_to_le16(size);
284 
285         retval = kaweth_internal_control_msg(kaweth->dev,
286                                              pipe,
287                                              dr,
288                                              data,
289                                              size,
290                                              timeout);
291 
292         kfree(dr);
293         return retval;
294 }
295 
296 /****************************************************************
297  *     kaweth_read_configuration
298  ****************************************************************/
299 static int kaweth_read_configuration(struct kaweth_device *kaweth)
300 {
301         int retval;
302 
303         netdev_dbg(kaweth->net, "Reading kaweth configuration\n");
304 
305         retval = kaweth_control(kaweth,
306                                 usb_rcvctrlpipe(kaweth->dev, 0),
307                                 KAWETH_COMMAND_GET_ETHERNET_DESC,
308                                 USB_TYPE_VENDOR | USB_DIR_IN | USB_RECIP_DEVICE,
309                                 0,
310                                 0,
311                                 (void *)&kaweth->configuration,
312                                 sizeof(kaweth->configuration),
313                                 KAWETH_CONTROL_TIMEOUT);
314 
315         return retval;
316 }
317 
318 /****************************************************************
319  *     kaweth_set_urb_size
320  ****************************************************************/
321 static int kaweth_set_urb_size(struct kaweth_device *kaweth, __u16 urb_size)
322 {
323         int retval;
324 
325         netdev_dbg(kaweth->net, "Setting URB size to %d\n", (unsigned)urb_size);
326 
327         retval = kaweth_control(kaweth,
328                                 usb_sndctrlpipe(kaweth->dev, 0),
329                                 KAWETH_COMMAND_SET_URB_SIZE,
330                                 USB_TYPE_VENDOR | USB_DIR_OUT | USB_RECIP_DEVICE,
331                                 urb_size,
332                                 0,
333                                 (void *)&kaweth->scratch,
334                                 0,
335                                 KAWETH_CONTROL_TIMEOUT);
336 
337         return retval;
338 }
339 
340 /****************************************************************
341  *     kaweth_set_sofs_wait
342  ****************************************************************/
343 static int kaweth_set_sofs_wait(struct kaweth_device *kaweth, __u16 sofs_wait)
344 {
345         int retval;
346 
347         netdev_dbg(kaweth->net, "Set SOFS wait to %d\n", (unsigned)sofs_wait);
348 
349         retval = kaweth_control(kaweth,
350                                 usb_sndctrlpipe(kaweth->dev, 0),
351                                 KAWETH_COMMAND_SET_SOFS_WAIT,
352                                 USB_TYPE_VENDOR | USB_DIR_OUT | USB_RECIP_DEVICE,
353                                 sofs_wait,
354                                 0,
355                                 (void *)&kaweth->scratch,
356                                 0,
357                                 KAWETH_CONTROL_TIMEOUT);
358 
359         return retval;
360 }
361 
362 /****************************************************************
363  *     kaweth_set_receive_filter
364  ****************************************************************/
365 static int kaweth_set_receive_filter(struct kaweth_device *kaweth,
366                                      __u16 receive_filter)
367 {
368         int retval;
369 
370         netdev_dbg(kaweth->net, "Set receive filter to %d\n",
371                    (unsigned)receive_filter);
372 
373         retval = kaweth_control(kaweth,
374                                 usb_sndctrlpipe(kaweth->dev, 0),
375                                 KAWETH_COMMAND_SET_PACKET_FILTER,
376                                 USB_TYPE_VENDOR | USB_DIR_OUT | USB_RECIP_DEVICE,
377                                 receive_filter,
378                                 0,
379                                 (void *)&kaweth->scratch,
380                                 0,
381                                 KAWETH_CONTROL_TIMEOUT);
382 
383         return retval;
384 }
385 
386 /****************************************************************
387  *     kaweth_download_firmware
388  ****************************************************************/
389 static int kaweth_download_firmware(struct kaweth_device *kaweth,
390                                     const char *fwname,
391                                     __u8 interrupt,
392                                     __u8 type)
393 {
394         const struct firmware *fw;
395         int data_len;
396         int ret;
397 
398         ret = request_firmware(&fw, fwname, &kaweth->dev->dev);
399         if (ret) {
400                 dev_err(&kaweth->intf->dev, "Firmware request failed\n");
401                 return ret;
402         }
403 
404         if (fw->size > KAWETH_FIRMWARE_BUF_SIZE) {
405                 dev_err(&kaweth->intf->dev, "Firmware too big: %zu\n",
406                         fw->size);
407                 release_firmware(fw);
408                 return -ENOSPC;
409         }
410         data_len = fw->size;
411         memcpy(kaweth->firmware_buf, fw->data, fw->size);
412 
413         release_firmware(fw);
414 
415         kaweth->firmware_buf[2] = (data_len & 0xFF) - 7;
416         kaweth->firmware_buf[3] = data_len >> 8;
417         kaweth->firmware_buf[4] = type;
418         kaweth->firmware_buf[5] = interrupt;
419 
420         netdev_dbg(kaweth->net, "High: %i, Low:%i\n", kaweth->firmware_buf[3],
421                    kaweth->firmware_buf[2]);
422 
423         netdev_dbg(kaweth->net,
424                    "Downloading firmware at %p to kaweth device at %p\n",
425                    kaweth->firmware_buf, kaweth);
426         netdev_dbg(kaweth->net, "Firmware length: %d\n", data_len);
427 
428         return kaweth_control(kaweth,
429                               usb_sndctrlpipe(kaweth->dev, 0),
430                               KAWETH_COMMAND_SCAN,
431                               USB_TYPE_VENDOR | USB_DIR_OUT | USB_RECIP_DEVICE,
432                               0,
433                               0,
434                               (void *)kaweth->firmware_buf,
435                               data_len,
436                               KAWETH_CONTROL_TIMEOUT);
437 }
438 
439 /****************************************************************
440  *     kaweth_trigger_firmware
441  ****************************************************************/
442 static int kaweth_trigger_firmware(struct kaweth_device *kaweth,
443                                    __u8 interrupt)
444 {
445         kaweth->firmware_buf[0] = 0xB6;
446         kaweth->firmware_buf[1] = 0xC3;
447         kaweth->firmware_buf[2] = 0x01;
448         kaweth->firmware_buf[3] = 0x00;
449         kaweth->firmware_buf[4] = 0x06;
450         kaweth->firmware_buf[5] = interrupt;
451         kaweth->firmware_buf[6] = 0x00;
452         kaweth->firmware_buf[7] = 0x00;
453 
454         netdev_dbg(kaweth->net, "Triggering firmware\n");
455 
456         return kaweth_control(kaweth,
457                               usb_sndctrlpipe(kaweth->dev, 0),
458                               KAWETH_COMMAND_SCAN,
459                               USB_TYPE_VENDOR | USB_DIR_OUT | USB_RECIP_DEVICE,
460                               0,
461                               0,
462                               (void *)kaweth->firmware_buf,
463                               8,
464                               KAWETH_CONTROL_TIMEOUT);
465 }
466 
467 /****************************************************************
468  *     kaweth_reset
469  ****************************************************************/
470 static int kaweth_reset(struct kaweth_device *kaweth)
471 {
472         int result;
473 
474         netdev_dbg(kaweth->net, "kaweth_reset(%p)\n", kaweth);
475         result = usb_reset_configuration(kaweth->dev);
476         mdelay(10);
477 
478         netdev_dbg(kaweth->net, "kaweth_reset() returns %d.\n", result);
479 
480         return result;
481 }
482 
483 static void kaweth_usb_receive(struct urb *);
484 static int kaweth_resubmit_rx_urb(struct kaweth_device *, gfp_t);
485 
486 /****************************************************************
487         int_callback
488 *****************************************************************/
489 
490 static void kaweth_resubmit_int_urb(struct kaweth_device *kaweth, gfp_t mf)
491 {
492         int status;
493 
494         status = usb_submit_urb (kaweth->irq_urb, mf);
495         if (unlikely(status == -ENOMEM)) {
496                 kaweth->suspend_lowmem_ctrl = 1;
497                 schedule_delayed_work(&kaweth->lowmem_work, HZ/4);
498         } else {
499                 kaweth->suspend_lowmem_ctrl = 0;
500         }
501 
502         if (status)
503                 dev_err(&kaweth->intf->dev,
504                         "can't resubmit intr, %s-%s, status %d\n",
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                 dev_err(&kaweth->intf->dev, "resubmitting rx_urb %d failed\n",
580                         result);
581         } else {
582                 kaweth->suspend_lowmem_rx = 0;
583         }
584 
585         return result;
586 }
587 
588 static void kaweth_async_set_rx_mode(struct kaweth_device *kaweth);
589 
590 /****************************************************************
591  *     kaweth_usb_receive
592  ****************************************************************/
593 static void kaweth_usb_receive(struct urb *urb)
594 {
595         struct device *dev = &urb->dev->dev;
596         struct kaweth_device *kaweth = urb->context;
597         struct net_device *net = kaweth->net;
598         int status = urb->status;
599 
600         int count = urb->actual_length;
601         int count2 = urb->transfer_buffer_length;
602 
603         __u16 pkt_len = le16_to_cpup((__le16 *)kaweth->rx_buf);
604 
605         struct sk_buff *skb;
606 
607         if (unlikely(status == -EPIPE)) {
608                 kaweth->stats.rx_errors++;
609                 kaweth->end = 1;
610                 wake_up(&kaweth->term_wait);
611                 dev_dbg(dev, "Status was -EPIPE.\n");
612                 return;
613         }
614         if (unlikely(status == -ECONNRESET || status == -ESHUTDOWN)) {
615                 /* we are killed - set a flag and wake the disconnect handler */
616                 kaweth->end = 1;
617                 wake_up(&kaweth->term_wait);
618                 dev_dbg(dev, "Status was -ECONNRESET or -ESHUTDOWN.\n");
619                 return;
620         }
621         if (unlikely(status == -EPROTO || status == -ETIME ||
622                      status == -EILSEQ)) {
623                 kaweth->stats.rx_errors++;
624                 dev_dbg(dev, "Status was -EPROTO, -ETIME, or -EILSEQ.\n");
625                 return;
626         }
627         if (unlikely(status == -EOVERFLOW)) {
628                 kaweth->stats.rx_errors++;
629                 dev_dbg(dev, "Status was -EOVERFLOW.\n");
630         }
631         spin_lock(&kaweth->device_lock);
632         if (IS_BLOCKED(kaweth->status)) {
633                 spin_unlock(&kaweth->device_lock);
634                 return;
635         }
636         spin_unlock(&kaweth->device_lock);
637 
638         if(status && status != -EREMOTEIO && count != 1) {
639                 dev_err(&kaweth->intf->dev,
640                         "%s RX status: %d count: %d packet_len: %d\n",
641                         net->name, status, count, (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                         dev_err(&kaweth->intf->dev,
649                                 "Packet length too long for USB frame (pkt_len: %x, count: %x)\n",
650                                 pkt_len, count);
651                         dev_err(&kaweth->intf->dev, "Packet len & 2047: %x\n",
652                                 pkt_len & 2047);
653                         dev_err(&kaweth->intf->dev, "Count 2: %x\n", count2);
654                         kaweth_resubmit_rx_urb(kaweth, GFP_ATOMIC);
655                         return;
656                 }
657 
658                 if(!(skb = dev_alloc_skb(pkt_len+2))) {
659                         kaweth_resubmit_rx_urb(kaweth, GFP_ATOMIC);
660                         return;
661                 }
662 
663                 skb_reserve(skb, 2);    /* Align IP on 16 byte boundaries */
664 
665                 skb_copy_to_linear_data(skb, kaweth->rx_buf + 2, pkt_len);
666 
667                 skb_put(skb, pkt_len);
668 
669                 skb->protocol = eth_type_trans(skb, net);
670 
671                 netif_rx(skb);
672 
673                 kaweth->stats.rx_packets++;
674                 kaweth->stats.rx_bytes += pkt_len;
675         }
676 
677         kaweth_resubmit_rx_urb(kaweth, GFP_ATOMIC);
678 }
679 
680 /****************************************************************
681  *     kaweth_open
682  ****************************************************************/
683 static int kaweth_open(struct net_device *net)
684 {
685         struct kaweth_device *kaweth = netdev_priv(net);
686         int res;
687 
688         netdev_dbg(kaweth->net, "Opening network device.\n");
689 
690         res = usb_autopm_get_interface(kaweth->intf);
691         if (res) {
692                 dev_err(&kaweth->intf->dev, "Interface cannot be resumed.\n");
693                 return -EIO;
694         }
695         res = kaweth_resubmit_rx_urb(kaweth, GFP_KERNEL);
696         if (res)
697                 goto err_out;
698 
699         usb_fill_int_urb(
700                 kaweth->irq_urb,
701                 kaweth->dev,
702                 usb_rcvintpipe(kaweth->dev, 3),
703                 kaweth->intbuffer,
704                 INTBUFFERSIZE,
705                 int_callback,
706                 kaweth,
707                 250); /* overriding the descriptor */
708         kaweth->irq_urb->transfer_dma = kaweth->intbufferhandle;
709         kaweth->irq_urb->transfer_flags |= URB_NO_TRANSFER_DMA_MAP;
710 
711         res = usb_submit_urb(kaweth->irq_urb, GFP_KERNEL);
712         if (res) {
713                 usb_kill_urb(kaweth->rx_urb);
714                 goto err_out;
715         }
716         kaweth->opened = 1;
717 
718         netif_start_queue(net);
719 
720         kaweth_async_set_rx_mode(kaweth);
721         return 0;
722 
723 err_out:
724         usb_autopm_put_interface(kaweth->intf);
725         return -EIO;
726 }
727 
728 /****************************************************************
729  *     kaweth_kill_urbs
730  ****************************************************************/
731 static void kaweth_kill_urbs(struct kaweth_device *kaweth)
732 {
733         usb_kill_urb(kaweth->irq_urb);
734         usb_kill_urb(kaweth->rx_urb);
735         usb_kill_urb(kaweth->tx_urb);
736 
737         cancel_delayed_work_sync(&kaweth->lowmem_work);
738 
739         /* a scheduled work may have resubmitted,
740            we hit them again */
741         usb_kill_urb(kaweth->irq_urb);
742         usb_kill_urb(kaweth->rx_urb);
743 }
744 
745 /****************************************************************
746  *     kaweth_close
747  ****************************************************************/
748 static int kaweth_close(struct net_device *net)
749 {
750         struct kaweth_device *kaweth = netdev_priv(net);
751 
752         netif_stop_queue(net);
753         kaweth->opened = 0;
754 
755         kaweth->status |= KAWETH_STATUS_CLOSING;
756 
757         kaweth_kill_urbs(kaweth);
758 
759         kaweth->status &= ~KAWETH_STATUS_CLOSING;
760 
761         usb_autopm_put_interface(kaweth->intf);
762 
763         return 0;
764 }
765 
766 static u32 kaweth_get_link(struct net_device *dev)
767 {
768         struct kaweth_device *kaweth = netdev_priv(dev);
769 
770         return kaweth->linkstate;
771 }
772 
773 static const struct ethtool_ops ops = {
774         .get_link       = kaweth_get_link
775 };
776 
777 /****************************************************************
778  *     kaweth_usb_transmit_complete
779  ****************************************************************/
780 static void kaweth_usb_transmit_complete(struct urb *urb)
781 {
782         struct kaweth_device *kaweth = urb->context;
783         struct sk_buff *skb = kaweth->tx_skb;
784         int status = urb->status;
785 
786         if (unlikely(status != 0))
787                 if (status != -ENOENT)
788                         dev_dbg(&urb->dev->dev, "%s: TX status %d.\n",
789                                 kaweth->net->name, status);
790 
791         netif_wake_queue(kaweth->net);
792         dev_kfree_skb_irq(skb);
793 }
794 
795 /****************************************************************
796  *     kaweth_start_xmit
797  ****************************************************************/
798 static netdev_tx_t kaweth_start_xmit(struct sk_buff *skb,
799                                            struct net_device *net)
800 {
801         struct kaweth_device *kaweth = netdev_priv(net);
802         __le16 *private_header;
803 
804         int res;
805 
806         spin_lock_irq(&kaweth->device_lock);
807 
808         kaweth_async_set_rx_mode(kaweth);
809         netif_stop_queue(net);
810         if (IS_BLOCKED(kaweth->status)) {
811                 goto skip;
812         }
813 
814         /* We now decide whether we can put our special header into the sk_buff */
815         if (skb_cloned(skb) || skb_headroom(skb) < 2) {
816                 /* no such luck - we make our own */
817                 struct sk_buff *copied_skb;
818                 copied_skb = skb_copy_expand(skb, 2, 0, GFP_ATOMIC);
819                 dev_kfree_skb_irq(skb);
820                 skb = copied_skb;
821                 if (!copied_skb) {
822                         kaweth->stats.tx_errors++;
823                         netif_start_queue(net);
824                         spin_unlock_irq(&kaweth->device_lock);
825                         return NETDEV_TX_OK;
826                 }
827         }
828 
829         private_header = (__le16 *)__skb_push(skb, 2);
830         *private_header = cpu_to_le16(skb->len-2);
831         kaweth->tx_skb = skb;
832 
833         usb_fill_bulk_urb(kaweth->tx_urb,
834                       kaweth->dev,
835                       usb_sndbulkpipe(kaweth->dev, 2),
836                       private_header,
837                       skb->len,
838                       kaweth_usb_transmit_complete,
839                       kaweth);
840         kaweth->end = 0;
841 
842         if((res = usb_submit_urb(kaweth->tx_urb, GFP_ATOMIC)))
843         {
844                 dev_warn(&net->dev, "kaweth failed tx_urb %d\n", res);
845 skip:
846                 kaweth->stats.tx_errors++;
847 
848                 netif_start_queue(net);
849                 dev_kfree_skb_irq(skb);
850         }
851         else
852         {
853                 kaweth->stats.tx_packets++;
854                 kaweth->stats.tx_bytes += skb->len;
855         }
856 
857         spin_unlock_irq(&kaweth->device_lock);
858 
859         return NETDEV_TX_OK;
860 }
861 
862 /****************************************************************
863  *     kaweth_set_rx_mode
864  ****************************************************************/
865 static void kaweth_set_rx_mode(struct net_device *net)
866 {
867         struct kaweth_device *kaweth = netdev_priv(net);
868 
869         __u16 packet_filter_bitmap = KAWETH_PACKET_FILTER_DIRECTED |
870                                      KAWETH_PACKET_FILTER_BROADCAST |
871                                      KAWETH_PACKET_FILTER_MULTICAST;
872 
873         netdev_dbg(net, "Setting Rx mode to %d\n", packet_filter_bitmap);
874 
875         netif_stop_queue(net);
876 
877         if (net->flags & IFF_PROMISC) {
878                 packet_filter_bitmap |= KAWETH_PACKET_FILTER_PROMISCUOUS;
879         }
880         else if (!netdev_mc_empty(net) || (net->flags & IFF_ALLMULTI)) {
881                 packet_filter_bitmap |= KAWETH_PACKET_FILTER_ALL_MULTICAST;
882         }
883 
884         kaweth->packet_filter_bitmap = packet_filter_bitmap;
885         netif_wake_queue(net);
886 }
887 
888 /****************************************************************
889  *     kaweth_async_set_rx_mode
890  ****************************************************************/
891 static void kaweth_async_set_rx_mode(struct kaweth_device *kaweth)
892 {
893         int result;
894         __u16 packet_filter_bitmap = kaweth->packet_filter_bitmap;
895 
896         kaweth->packet_filter_bitmap = 0;
897         if (packet_filter_bitmap == 0)
898                 return;
899 
900         if (in_interrupt())
901                 return;
902 
903         result = kaweth_control(kaweth,
904                                 usb_sndctrlpipe(kaweth->dev, 0),
905                                 KAWETH_COMMAND_SET_PACKET_FILTER,
906                                 USB_TYPE_VENDOR | USB_DIR_OUT | USB_RECIP_DEVICE,
907                                 packet_filter_bitmap,
908                                 0,
909                                 (void *)&kaweth->scratch,
910                                 0,
911                                 KAWETH_CONTROL_TIMEOUT);
912 
913         if(result < 0) {
914                 dev_err(&kaweth->intf->dev, "Failed to set Rx mode: %d\n",
915                         result);
916         }
917         else {
918                 netdev_dbg(kaweth->net, "Set Rx mode to %d\n",
919                            packet_filter_bitmap);
920         }
921 }
922 
923 /****************************************************************
924  *     kaweth_netdev_stats
925  ****************************************************************/
926 static struct net_device_stats *kaweth_netdev_stats(struct net_device *dev)
927 {
928         struct kaweth_device *kaweth = netdev_priv(dev);
929         return &kaweth->stats;
930 }
931 
932 /****************************************************************
933  *     kaweth_tx_timeout
934  ****************************************************************/
935 static void kaweth_tx_timeout(struct net_device *net)
936 {
937         struct kaweth_device *kaweth = netdev_priv(net);
938 
939         dev_warn(&net->dev, "%s: Tx timed out. Resetting.\n", net->name);
940         kaweth->stats.tx_errors++;
941         net->trans_start = jiffies;
942 
943         usb_unlink_urb(kaweth->tx_urb);
944 }
945 
946 /****************************************************************
947  *     kaweth_suspend
948  ****************************************************************/
949 static int kaweth_suspend(struct usb_interface *intf, pm_message_t message)
950 {
951         struct kaweth_device *kaweth = usb_get_intfdata(intf);
952         unsigned long flags;
953 
954         dev_dbg(&intf->dev, "Suspending device\n");
955         spin_lock_irqsave(&kaweth->device_lock, flags);
956         kaweth->status |= KAWETH_STATUS_SUSPENDING;
957         spin_unlock_irqrestore(&kaweth->device_lock, flags);
958 
959         kaweth_kill_urbs(kaweth);
960         return 0;
961 }
962 
963 /****************************************************************
964  *     kaweth_resume
965  ****************************************************************/
966 static int kaweth_resume(struct usb_interface *intf)
967 {
968         struct kaweth_device *kaweth = usb_get_intfdata(intf);
969         unsigned long flags;
970 
971         dev_dbg(&intf->dev, "Resuming device\n");
972         spin_lock_irqsave(&kaweth->device_lock, flags);
973         kaweth->status &= ~KAWETH_STATUS_SUSPENDING;
974         spin_unlock_irqrestore(&kaweth->device_lock, flags);
975 
976         if (!kaweth->opened)
977                 return 0;
978         kaweth_resubmit_rx_urb(kaweth, GFP_NOIO);
979         kaweth_resubmit_int_urb(kaweth, GFP_NOIO);
980 
981         return 0;
982 }
983 
984 /****************************************************************
985  *     kaweth_probe
986  ****************************************************************/
987 
988 
989 static const struct net_device_ops kaweth_netdev_ops = {
990         .ndo_open =                     kaweth_open,
991         .ndo_stop =                     kaweth_close,
992         .ndo_start_xmit =               kaweth_start_xmit,
993         .ndo_tx_timeout =               kaweth_tx_timeout,
994         .ndo_set_rx_mode =              kaweth_set_rx_mode,
995         .ndo_get_stats =                kaweth_netdev_stats,
996         .ndo_change_mtu =               eth_change_mtu,
997         .ndo_set_mac_address =          eth_mac_addr,
998         .ndo_validate_addr =            eth_validate_addr,
999 };
1000 
1001 static int kaweth_probe(
1002                 struct usb_interface *intf,
1003                 const struct usb_device_id *id      /* from id_table */
1004         )
1005 {
1006         struct device *dev = &intf->dev;
1007         struct usb_device *udev = interface_to_usbdev(intf);
1008         struct kaweth_device *kaweth;
1009         struct net_device *netdev;
1010         const eth_addr_t bcast_addr = { 0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF };
1011         int result = 0;
1012 
1013         dev_dbg(dev,
1014                 "Kawasaki Device Probe (Device number:%d): 0x%4.4x:0x%4.4x:0x%4.4x\n",
1015                 udev->devnum, le16_to_cpu(udev->descriptor.idVendor),
1016                 le16_to_cpu(udev->descriptor.idProduct),
1017                 le16_to_cpu(udev->descriptor.bcdDevice));
1018 
1019         dev_dbg(dev, "Device at %p\n", udev);
1020 
1021         dev_dbg(dev, "Descriptor length: %x type: %x\n",
1022                 (int)udev->descriptor.bLength,
1023                 (int)udev->descriptor.bDescriptorType);
1024 
1025         netdev = alloc_etherdev(sizeof(*kaweth));
1026         if (!netdev)
1027                 return -ENOMEM;
1028 
1029         kaweth = netdev_priv(netdev);
1030         kaweth->dev = udev;
1031         kaweth->net = netdev;
1032 
1033         spin_lock_init(&kaweth->device_lock);
1034         init_waitqueue_head(&kaweth->term_wait);
1035 
1036         dev_dbg(dev, "Resetting.\n");
1037 
1038         kaweth_reset(kaweth);
1039 
1040         /*
1041          * If high byte of bcdDevice is nonzero, firmware is already
1042          * downloaded. Don't try to do it again, or we'll hang the device.
1043          */
1044 
1045         if (le16_to_cpu(udev->descriptor.bcdDevice) >> 8) {
1046                 dev_info(dev, "Firmware present in device.\n");
1047         } else {
1048                 /* Download the firmware */
1049                 dev_info(dev, "Downloading firmware...\n");
1050                 kaweth->firmware_buf = (__u8 *)__get_free_page(GFP_KERNEL);
1051                 if ((result = kaweth_download_firmware(kaweth,
1052                                                       "kaweth/new_code.bin",
1053                                                       100,
1054                                                       2)) < 0) {
1055                         dev_err(dev, "Error downloading firmware (%d)\n",
1056                                 result);
1057                         goto err_fw;
1058                 }
1059 
1060                 if ((result = kaweth_download_firmware(kaweth,
1061                                                       "kaweth/new_code_fix.bin",
1062                                                       100,
1063                                                       3)) < 0) {
1064                         dev_err(dev, "Error downloading firmware fix (%d)\n",
1065                                 result);
1066                         goto err_fw;
1067                 }
1068 
1069                 if ((result = kaweth_download_firmware(kaweth,
1070                                                       "kaweth/trigger_code.bin",
1071                                                       126,
1072                                                       2)) < 0) {
1073                         dev_err(dev, "Error downloading trigger code (%d)\n",
1074                                 result);
1075                         goto err_fw;
1076 
1077                 }
1078 
1079                 if ((result = kaweth_download_firmware(kaweth,
1080                                                       "kaweth/trigger_code_fix.bin",
1081                                                       126,
1082                                                       3)) < 0) {
1083                         dev_err(dev, "Error downloading trigger code fix (%d)\n", result);
1084                         goto err_fw;
1085                 }
1086 
1087 
1088                 if ((result = kaweth_trigger_firmware(kaweth, 126)) < 0) {
1089                         dev_err(dev, "Error triggering firmware (%d)\n", result);
1090                         goto err_fw;
1091                 }
1092 
1093                 /* Device will now disappear for a moment...  */
1094                 dev_info(dev, "Firmware loaded.  I'll be back...\n");
1095 err_fw:
1096                 free_page((unsigned long)kaweth->firmware_buf);
1097                 free_netdev(netdev);
1098                 return -EIO;
1099         }
1100 
1101         result = kaweth_read_configuration(kaweth);
1102 
1103         if(result < 0) {
1104                 dev_err(dev, "Error reading configuration (%d), no net device created\n", result);
1105                 goto err_free_netdev;
1106         }
1107 
1108         dev_info(dev, "Statistics collection: %x\n", kaweth->configuration.statistics_mask);
1109         dev_info(dev, "Multicast filter limit: %x\n", kaweth->configuration.max_multicast_filters & ((1 << 15) - 1));
1110         dev_info(dev, "MTU: %d\n", le16_to_cpu(kaweth->configuration.segment_size));
1111         dev_info(dev, "Read MAC address %pM\n", kaweth->configuration.hw_addr);
1112 
1113         if(!memcmp(&kaweth->configuration.hw_addr,
1114                    &bcast_addr,
1115                    sizeof(bcast_addr))) {
1116                 dev_err(dev, "Firmware not functioning properly, no net device created\n");
1117                 goto err_free_netdev;
1118         }
1119 
1120         if(kaweth_set_urb_size(kaweth, KAWETH_BUF_SIZE) < 0) {
1121                 dev_dbg(dev, "Error setting URB size\n");
1122                 goto err_free_netdev;
1123         }
1124 
1125         if(kaweth_set_sofs_wait(kaweth, KAWETH_SOFS_TO_WAIT) < 0) {
1126                 dev_err(dev, "Error setting SOFS wait\n");
1127                 goto err_free_netdev;
1128         }
1129 
1130         result = kaweth_set_receive_filter(kaweth,
1131                                            KAWETH_PACKET_FILTER_DIRECTED |
1132                                            KAWETH_PACKET_FILTER_BROADCAST |
1133                                            KAWETH_PACKET_FILTER_MULTICAST);
1134 
1135         if(result < 0) {
1136                 dev_err(dev, "Error setting receive filter\n");
1137                 goto err_free_netdev;
1138         }
1139 
1140         dev_dbg(dev, "Initializing net device.\n");
1141 
1142         kaweth->intf = intf;
1143 
1144         kaweth->tx_urb = usb_alloc_urb(0, GFP_KERNEL);
1145         if (!kaweth->tx_urb)
1146                 goto err_free_netdev;
1147         kaweth->rx_urb = usb_alloc_urb(0, GFP_KERNEL);
1148         if (!kaweth->rx_urb)
1149                 goto err_only_tx;
1150         kaweth->irq_urb = usb_alloc_urb(0, GFP_KERNEL);
1151         if (!kaweth->irq_urb)
1152                 goto err_tx_and_rx;
1153 
1154         kaweth->intbuffer = usb_alloc_coherent( kaweth->dev,
1155                                                 INTBUFFERSIZE,
1156                                                 GFP_KERNEL,
1157                                                 &kaweth->intbufferhandle);
1158         if (!kaweth->intbuffer)
1159                 goto err_tx_and_rx_and_irq;
1160         kaweth->rx_buf = usb_alloc_coherent(    kaweth->dev,
1161                                                 KAWETH_BUF_SIZE,
1162                                                 GFP_KERNEL,
1163                                                 &kaweth->rxbufferhandle);
1164         if (!kaweth->rx_buf)
1165                 goto err_all_but_rxbuf;
1166 
1167         memcpy(netdev->broadcast, &bcast_addr, sizeof(bcast_addr));
1168         memcpy(netdev->dev_addr, &kaweth->configuration.hw_addr,
1169                sizeof(kaweth->configuration.hw_addr));
1170 
1171         netdev->netdev_ops = &kaweth_netdev_ops;
1172         netdev->watchdog_timeo = KAWETH_TX_TIMEOUT;
1173         netdev->mtu = le16_to_cpu(kaweth->configuration.segment_size);
1174         netdev->ethtool_ops = &ops;
1175 
1176         /* kaweth is zeroed as part of alloc_netdev */
1177         INIT_DELAYED_WORK(&kaweth->lowmem_work, kaweth_resubmit_tl);
1178         usb_set_intfdata(intf, kaweth);
1179 
1180 #if 0
1181 // dma_supported() is deeply broken on almost all architectures
1182         if (dma_supported (dev, 0xffffffffffffffffULL))
1183                 kaweth->net->features |= NETIF_F_HIGHDMA;
1184 #endif
1185 
1186         SET_NETDEV_DEV(netdev, dev);
1187         if (register_netdev(netdev) != 0) {
1188                 dev_err(dev, "Error registering netdev.\n");
1189                 goto err_intfdata;
1190         }
1191 
1192         dev_info(dev, "kaweth interface created at %s\n",
1193                  kaweth->net->name);
1194 
1195         dev_dbg(dev, "Kaweth probe returning.\n");
1196 
1197         return 0;
1198 
1199 err_intfdata:
1200         usb_set_intfdata(intf, NULL);
1201         usb_free_coherent(kaweth->dev, KAWETH_BUF_SIZE, (void *)kaweth->rx_buf, kaweth->rxbufferhandle);
1202 err_all_but_rxbuf:
1203         usb_free_coherent(kaweth->dev, INTBUFFERSIZE, (void *)kaweth->intbuffer, kaweth->intbufferhandle);
1204 err_tx_and_rx_and_irq:
1205         usb_free_urb(kaweth->irq_urb);
1206 err_tx_and_rx:
1207         usb_free_urb(kaweth->rx_urb);
1208 err_only_tx:
1209         usb_free_urb(kaweth->tx_urb);
1210 err_free_netdev:
1211         free_netdev(netdev);
1212 
1213         return -EIO;
1214 }
1215 
1216 /****************************************************************
1217  *     kaweth_disconnect
1218  ****************************************************************/
1219 static void kaweth_disconnect(struct usb_interface *intf)
1220 {
1221         struct kaweth_device *kaweth = usb_get_intfdata(intf);
1222         struct net_device *netdev;
1223 
1224         dev_info(&intf->dev, "Unregistering\n");
1225 
1226         usb_set_intfdata(intf, NULL);
1227         if (!kaweth) {
1228                 dev_warn(&intf->dev, "unregistering non-existent device\n");
1229                 return;
1230         }
1231         netdev = kaweth->net;
1232 
1233         netdev_dbg(kaweth->net, "Unregistering net device\n");
1234         unregister_netdev(netdev);
1235 
1236         usb_free_urb(kaweth->rx_urb);
1237         usb_free_urb(kaweth->tx_urb);
1238         usb_free_urb(kaweth->irq_urb);
1239 
1240         usb_free_coherent(kaweth->dev, KAWETH_BUF_SIZE, (void *)kaweth->rx_buf, kaweth->rxbufferhandle);
1241         usb_free_coherent(kaweth->dev, INTBUFFERSIZE, (void *)kaweth->intbuffer, kaweth->intbufferhandle);
1242 
1243         free_netdev(netdev);
1244 }
1245 
1246 
1247 // FIXME this completion stuff is a modified clone of
1248 // an OLD version of some stuff in usb.c ...
1249 struct usb_api_data {
1250         wait_queue_head_t wqh;
1251         int done;
1252 };
1253 
1254 /*-------------------------------------------------------------------*
1255  * completion handler for compatibility wrappers (sync control/bulk) *
1256  *-------------------------------------------------------------------*/
1257 static void usb_api_blocking_completion(struct urb *urb)
1258 {
1259         struct usb_api_data *awd = (struct usb_api_data *)urb->context;
1260 
1261         awd->done=1;
1262         wake_up(&awd->wqh);
1263 }
1264 
1265 /*-------------------------------------------------------------------*
1266  *                         COMPATIBILITY STUFF                       *
1267  *-------------------------------------------------------------------*/
1268 
1269 // Starts urb and waits for completion or timeout
1270 static int usb_start_wait_urb(struct urb *urb, int timeout, int* actual_length)
1271 {
1272         struct usb_api_data awd;
1273         int status;
1274 
1275         init_waitqueue_head(&awd.wqh);
1276         awd.done = 0;
1277 
1278         urb->context = &awd;
1279         status = usb_submit_urb(urb, GFP_NOIO);
1280         if (status) {
1281                 // something went wrong
1282                 usb_free_urb(urb);
1283                 return status;
1284         }
1285 
1286         if (!wait_event_timeout(awd.wqh, awd.done, timeout)) {
1287                 // timeout
1288                 dev_warn(&urb->dev->dev, "usb_control/bulk_msg: timeout\n");
1289                 usb_kill_urb(urb);  // remove urb safely
1290                 status = -ETIMEDOUT;
1291         }
1292         else {
1293                 status = urb->status;
1294         }
1295 
1296         if (actual_length) {
1297                 *actual_length = urb->actual_length;
1298         }
1299 
1300         usb_free_urb(urb);
1301         return status;
1302 }
1303 
1304 /*-------------------------------------------------------------------*/
1305 // returns status (negative) or length (positive)
1306 static int kaweth_internal_control_msg(struct usb_device *usb_dev,
1307                                        unsigned int pipe,
1308                                        struct usb_ctrlrequest *cmd, void *data,
1309                                        int len, int timeout)
1310 {
1311         struct urb *urb;
1312         int retv;
1313         int length = 0; /* shut up GCC */
1314 
1315         urb = usb_alloc_urb(0, GFP_ATOMIC);
1316         if (!urb)
1317                 return -ENOMEM;
1318 
1319         usb_fill_control_urb(urb, usb_dev, pipe, (unsigned char*)cmd, data,
1320                          len, usb_api_blocking_completion, NULL);
1321 
1322         retv = usb_start_wait_urb(urb, timeout, &length);
1323         if (retv < 0) {
1324                 return retv;
1325         }
1326         else {
1327                 return length;
1328         }
1329 }
1330 
1331 module_usb_driver(kaweth_driver);
1332 

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