Version:  2.0.40 2.2.26 2.4.37 3.12 3.13 3.14 3.15 3.16 3.17 3.18 3.19 4.0 4.1 4.2 4.3 4.4 4.5 4.6 4.7 4.8 4.9

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         if(in_interrupt()) {
269                 netdev_dbg(kaweth->net, "in_interrupt()\n");
270                 return -EBUSY;
271         }
272 
273         dr = kmalloc(sizeof(struct usb_ctrlrequest), GFP_ATOMIC);
274         if (!dr)
275                 return -ENOMEM;
276 
277         dr->bRequestType = requesttype;
278         dr->bRequest = request;
279         dr->wValue = cpu_to_le16(value);
280         dr->wIndex = cpu_to_le16(index);
281         dr->wLength = cpu_to_le16(size);
282 
283         retval = kaweth_internal_control_msg(kaweth->dev,
284                                              pipe,
285                                              dr,
286                                              data,
287                                              size,
288                                              timeout);
289 
290         kfree(dr);
291         return retval;
292 }
293 
294 /****************************************************************
295  *     kaweth_read_configuration
296  ****************************************************************/
297 static int kaweth_read_configuration(struct kaweth_device *kaweth)
298 {
299         int retval;
300 
301         retval = kaweth_control(kaweth,
302                                 usb_rcvctrlpipe(kaweth->dev, 0),
303                                 KAWETH_COMMAND_GET_ETHERNET_DESC,
304                                 USB_TYPE_VENDOR | USB_DIR_IN | USB_RECIP_DEVICE,
305                                 0,
306                                 0,
307                                 (void *)&kaweth->configuration,
308                                 sizeof(kaweth->configuration),
309                                 KAWETH_CONTROL_TIMEOUT);
310 
311         return retval;
312 }
313 
314 /****************************************************************
315  *     kaweth_set_urb_size
316  ****************************************************************/
317 static int kaweth_set_urb_size(struct kaweth_device *kaweth, __u16 urb_size)
318 {
319         int retval;
320 
321         netdev_dbg(kaweth->net, "Setting URB size to %d\n", (unsigned)urb_size);
322 
323         retval = kaweth_control(kaweth,
324                                 usb_sndctrlpipe(kaweth->dev, 0),
325                                 KAWETH_COMMAND_SET_URB_SIZE,
326                                 USB_TYPE_VENDOR | USB_DIR_OUT | USB_RECIP_DEVICE,
327                                 urb_size,
328                                 0,
329                                 (void *)&kaweth->scratch,
330                                 0,
331                                 KAWETH_CONTROL_TIMEOUT);
332 
333         return retval;
334 }
335 
336 /****************************************************************
337  *     kaweth_set_sofs_wait
338  ****************************************************************/
339 static int kaweth_set_sofs_wait(struct kaweth_device *kaweth, __u16 sofs_wait)
340 {
341         int retval;
342 
343         netdev_dbg(kaweth->net, "Set SOFS wait to %d\n", (unsigned)sofs_wait);
344 
345         retval = kaweth_control(kaweth,
346                                 usb_sndctrlpipe(kaweth->dev, 0),
347                                 KAWETH_COMMAND_SET_SOFS_WAIT,
348                                 USB_TYPE_VENDOR | USB_DIR_OUT | USB_RECIP_DEVICE,
349                                 sofs_wait,
350                                 0,
351                                 (void *)&kaweth->scratch,
352                                 0,
353                                 KAWETH_CONTROL_TIMEOUT);
354 
355         return retval;
356 }
357 
358 /****************************************************************
359  *     kaweth_set_receive_filter
360  ****************************************************************/
361 static int kaweth_set_receive_filter(struct kaweth_device *kaweth,
362                                      __u16 receive_filter)
363 {
364         int retval;
365 
366         netdev_dbg(kaweth->net, "Set receive filter to %d\n",
367                    (unsigned)receive_filter);
368 
369         retval = kaweth_control(kaweth,
370                                 usb_sndctrlpipe(kaweth->dev, 0),
371                                 KAWETH_COMMAND_SET_PACKET_FILTER,
372                                 USB_TYPE_VENDOR | USB_DIR_OUT | USB_RECIP_DEVICE,
373                                 receive_filter,
374                                 0,
375                                 (void *)&kaweth->scratch,
376                                 0,
377                                 KAWETH_CONTROL_TIMEOUT);
378 
379         return retval;
380 }
381 
382 /****************************************************************
383  *     kaweth_download_firmware
384  ****************************************************************/
385 static int kaweth_download_firmware(struct kaweth_device *kaweth,
386                                     const char *fwname,
387                                     __u8 interrupt,
388                                     __u8 type)
389 {
390         const struct firmware *fw;
391         int data_len;
392         int ret;
393 
394         ret = request_firmware(&fw, fwname, &kaweth->dev->dev);
395         if (ret) {
396                 dev_err(&kaweth->intf->dev, "Firmware request failed\n");
397                 return ret;
398         }
399 
400         if (fw->size > KAWETH_FIRMWARE_BUF_SIZE) {
401                 dev_err(&kaweth->intf->dev, "Firmware too big: %zu\n",
402                         fw->size);
403                 release_firmware(fw);
404                 return -ENOSPC;
405         }
406         data_len = fw->size;
407         memcpy(kaweth->firmware_buf, fw->data, fw->size);
408 
409         release_firmware(fw);
410 
411         kaweth->firmware_buf[2] = (data_len & 0xFF) - 7;
412         kaweth->firmware_buf[3] = data_len >> 8;
413         kaweth->firmware_buf[4] = type;
414         kaweth->firmware_buf[5] = interrupt;
415 
416         netdev_dbg(kaweth->net, "High: %i, Low:%i\n", kaweth->firmware_buf[3],
417                    kaweth->firmware_buf[2]);
418 
419         netdev_dbg(kaweth->net,
420                    "Downloading firmware at %p to kaweth device at %p\n",
421                    kaweth->firmware_buf, kaweth);
422         netdev_dbg(kaweth->net, "Firmware length: %d\n", data_len);
423 
424         return kaweth_control(kaweth,
425                               usb_sndctrlpipe(kaweth->dev, 0),
426                               KAWETH_COMMAND_SCAN,
427                               USB_TYPE_VENDOR | USB_DIR_OUT | USB_RECIP_DEVICE,
428                               0,
429                               0,
430                               (void *)kaweth->firmware_buf,
431                               data_len,
432                               KAWETH_CONTROL_TIMEOUT);
433 }
434 
435 /****************************************************************
436  *     kaweth_trigger_firmware
437  ****************************************************************/
438 static int kaweth_trigger_firmware(struct kaweth_device *kaweth,
439                                    __u8 interrupt)
440 {
441         kaweth->firmware_buf[0] = 0xB6;
442         kaweth->firmware_buf[1] = 0xC3;
443         kaweth->firmware_buf[2] = 0x01;
444         kaweth->firmware_buf[3] = 0x00;
445         kaweth->firmware_buf[4] = 0x06;
446         kaweth->firmware_buf[5] = interrupt;
447         kaweth->firmware_buf[6] = 0x00;
448         kaweth->firmware_buf[7] = 0x00;
449 
450         return kaweth_control(kaweth,
451                               usb_sndctrlpipe(kaweth->dev, 0),
452                               KAWETH_COMMAND_SCAN,
453                               USB_TYPE_VENDOR | USB_DIR_OUT | USB_RECIP_DEVICE,
454                               0,
455                               0,
456                               (void *)kaweth->firmware_buf,
457                               8,
458                               KAWETH_CONTROL_TIMEOUT);
459 }
460 
461 /****************************************************************
462  *     kaweth_reset
463  ****************************************************************/
464 static int kaweth_reset(struct kaweth_device *kaweth)
465 {
466         int result;
467 
468         result = usb_reset_configuration(kaweth->dev);
469         mdelay(10);
470 
471         netdev_dbg(kaweth->net, "kaweth_reset() returns %d.\n", result);
472 
473         return result;
474 }
475 
476 static void kaweth_usb_receive(struct urb *);
477 static int kaweth_resubmit_rx_urb(struct kaweth_device *, gfp_t);
478 
479 /****************************************************************
480         int_callback
481 *****************************************************************/
482 
483 static void kaweth_resubmit_int_urb(struct kaweth_device *kaweth, gfp_t mf)
484 {
485         int status;
486 
487         status = usb_submit_urb (kaweth->irq_urb, mf);
488         if (unlikely(status == -ENOMEM)) {
489                 kaweth->suspend_lowmem_ctrl = 1;
490                 schedule_delayed_work(&kaweth->lowmem_work, HZ/4);
491         } else {
492                 kaweth->suspend_lowmem_ctrl = 0;
493         }
494 
495         if (status)
496                 dev_err(&kaweth->intf->dev,
497                         "can't resubmit intr, %s-%s, status %d\n",
498                         kaweth->dev->bus->bus_name,
499                         kaweth->dev->devpath, status);
500 }
501 
502 static void int_callback(struct urb *u)
503 {
504         struct kaweth_device *kaweth = u->context;
505         int act_state;
506         int status = u->status;
507 
508         switch (status) {
509         case 0:                 /* success */
510                 break;
511         case -ECONNRESET:       /* unlink */
512         case -ENOENT:
513         case -ESHUTDOWN:
514                 return;
515         /* -EPIPE:  should clear the halt */
516         default:                /* error */
517                 goto resubmit;
518         }
519 
520         /* we check the link state to report changes */
521         if (kaweth->linkstate != (act_state = ( kaweth->intbuffer[STATE_OFFSET] | STATE_MASK) >> STATE_SHIFT)) {
522                 if (act_state)
523                         netif_carrier_on(kaweth->net);
524                 else
525                         netif_carrier_off(kaweth->net);
526 
527                 kaweth->linkstate = act_state;
528         }
529 resubmit:
530         kaweth_resubmit_int_urb(kaweth, GFP_ATOMIC);
531 }
532 
533 static void kaweth_resubmit_tl(struct work_struct *work)
534 {
535         struct kaweth_device *kaweth =
536                 container_of(work, struct kaweth_device, lowmem_work.work);
537 
538         if (IS_BLOCKED(kaweth->status))
539                 return;
540 
541         if (kaweth->suspend_lowmem_rx)
542                 kaweth_resubmit_rx_urb(kaweth, GFP_NOIO);
543 
544         if (kaweth->suspend_lowmem_ctrl)
545                 kaweth_resubmit_int_urb(kaweth, GFP_NOIO);
546 }
547 
548 
549 /****************************************************************
550  *     kaweth_resubmit_rx_urb
551  ****************************************************************/
552 static int kaweth_resubmit_rx_urb(struct kaweth_device *kaweth,
553                                                 gfp_t mem_flags)
554 {
555         int result;
556 
557         usb_fill_bulk_urb(kaweth->rx_urb,
558                       kaweth->dev,
559                       usb_rcvbulkpipe(kaweth->dev, 1),
560                       kaweth->rx_buf,
561                       KAWETH_BUF_SIZE,
562                       kaweth_usb_receive,
563                       kaweth);
564         kaweth->rx_urb->transfer_flags |= URB_NO_TRANSFER_DMA_MAP;
565         kaweth->rx_urb->transfer_dma = kaweth->rxbufferhandle;
566 
567         if((result = usb_submit_urb(kaweth->rx_urb, mem_flags))) {
568                 if (result == -ENOMEM) {
569                         kaweth->suspend_lowmem_rx = 1;
570                         schedule_delayed_work(&kaweth->lowmem_work, HZ/4);
571                 }
572                 dev_err(&kaweth->intf->dev, "resubmitting rx_urb %d failed\n",
573                         result);
574         } else {
575                 kaweth->suspend_lowmem_rx = 0;
576         }
577 
578         return result;
579 }
580 
581 static void kaweth_async_set_rx_mode(struct kaweth_device *kaweth);
582 
583 /****************************************************************
584  *     kaweth_usb_receive
585  ****************************************************************/
586 static void kaweth_usb_receive(struct urb *urb)
587 {
588         struct device *dev = &urb->dev->dev;
589         struct kaweth_device *kaweth = urb->context;
590         struct net_device *net = kaweth->net;
591         int status = urb->status;
592 
593         int count = urb->actual_length;
594         int count2 = urb->transfer_buffer_length;
595 
596         __u16 pkt_len = le16_to_cpup((__le16 *)kaweth->rx_buf);
597 
598         struct sk_buff *skb;
599 
600         if (unlikely(status == -EPIPE)) {
601                 kaweth->stats.rx_errors++;
602                 kaweth->end = 1;
603                 wake_up(&kaweth->term_wait);
604                 dev_dbg(dev, "Status was -EPIPE.\n");
605                 return;
606         }
607         if (unlikely(status == -ECONNRESET || status == -ESHUTDOWN)) {
608                 /* we are killed - set a flag and wake the disconnect handler */
609                 kaweth->end = 1;
610                 wake_up(&kaweth->term_wait);
611                 dev_dbg(dev, "Status was -ECONNRESET or -ESHUTDOWN.\n");
612                 return;
613         }
614         if (unlikely(status == -EPROTO || status == -ETIME ||
615                      status == -EILSEQ)) {
616                 kaweth->stats.rx_errors++;
617                 dev_dbg(dev, "Status was -EPROTO, -ETIME, or -EILSEQ.\n");
618                 return;
619         }
620         if (unlikely(status == -EOVERFLOW)) {
621                 kaweth->stats.rx_errors++;
622                 dev_dbg(dev, "Status was -EOVERFLOW.\n");
623         }
624         spin_lock(&kaweth->device_lock);
625         if (IS_BLOCKED(kaweth->status)) {
626                 spin_unlock(&kaweth->device_lock);
627                 return;
628         }
629         spin_unlock(&kaweth->device_lock);
630 
631         if(status && status != -EREMOTEIO && count != 1) {
632                 dev_err(&kaweth->intf->dev,
633                         "%s RX status: %d count: %d packet_len: %d\n",
634                         net->name, status, count, (int)pkt_len);
635                 kaweth_resubmit_rx_urb(kaweth, GFP_ATOMIC);
636                 return;
637         }
638 
639         if(kaweth->net && (count > 2)) {
640                 if(pkt_len > (count - 2)) {
641                         dev_err(&kaweth->intf->dev,
642                                 "Packet length too long for USB frame (pkt_len: %x, count: %x)\n",
643                                 pkt_len, count);
644                         dev_err(&kaweth->intf->dev, "Packet len & 2047: %x\n",
645                                 pkt_len & 2047);
646                         dev_err(&kaweth->intf->dev, "Count 2: %x\n", count2);
647                         kaweth_resubmit_rx_urb(kaweth, GFP_ATOMIC);
648                         return;
649                 }
650 
651                 if(!(skb = dev_alloc_skb(pkt_len+2))) {
652                         kaweth_resubmit_rx_urb(kaweth, GFP_ATOMIC);
653                         return;
654                 }
655 
656                 skb_reserve(skb, 2);    /* Align IP on 16 byte boundaries */
657 
658                 skb_copy_to_linear_data(skb, kaweth->rx_buf + 2, pkt_len);
659 
660                 skb_put(skb, pkt_len);
661 
662                 skb->protocol = eth_type_trans(skb, net);
663 
664                 netif_rx(skb);
665 
666                 kaweth->stats.rx_packets++;
667                 kaweth->stats.rx_bytes += pkt_len;
668         }
669 
670         kaweth_resubmit_rx_urb(kaweth, GFP_ATOMIC);
671 }
672 
673 /****************************************************************
674  *     kaweth_open
675  ****************************************************************/
676 static int kaweth_open(struct net_device *net)
677 {
678         struct kaweth_device *kaweth = netdev_priv(net);
679         int res;
680 
681         res = usb_autopm_get_interface(kaweth->intf);
682         if (res) {
683                 dev_err(&kaweth->intf->dev, "Interface cannot be resumed.\n");
684                 return -EIO;
685         }
686         res = kaweth_resubmit_rx_urb(kaweth, GFP_KERNEL);
687         if (res)
688                 goto err_out;
689 
690         usb_fill_int_urb(
691                 kaweth->irq_urb,
692                 kaweth->dev,
693                 usb_rcvintpipe(kaweth->dev, 3),
694                 kaweth->intbuffer,
695                 INTBUFFERSIZE,
696                 int_callback,
697                 kaweth,
698                 250); /* overriding the descriptor */
699         kaweth->irq_urb->transfer_dma = kaweth->intbufferhandle;
700         kaweth->irq_urb->transfer_flags |= URB_NO_TRANSFER_DMA_MAP;
701 
702         res = usb_submit_urb(kaweth->irq_urb, GFP_KERNEL);
703         if (res) {
704                 usb_kill_urb(kaweth->rx_urb);
705                 goto err_out;
706         }
707         kaweth->opened = 1;
708 
709         netif_start_queue(net);
710 
711         kaweth_async_set_rx_mode(kaweth);
712         return 0;
713 
714 err_out:
715         usb_autopm_put_interface(kaweth->intf);
716         return -EIO;
717 }
718 
719 /****************************************************************
720  *     kaweth_kill_urbs
721  ****************************************************************/
722 static void kaweth_kill_urbs(struct kaweth_device *kaweth)
723 {
724         usb_kill_urb(kaweth->irq_urb);
725         usb_kill_urb(kaweth->rx_urb);
726         usb_kill_urb(kaweth->tx_urb);
727 
728         cancel_delayed_work_sync(&kaweth->lowmem_work);
729 
730         /* a scheduled work may have resubmitted,
731            we hit them again */
732         usb_kill_urb(kaweth->irq_urb);
733         usb_kill_urb(kaweth->rx_urb);
734 }
735 
736 /****************************************************************
737  *     kaweth_close
738  ****************************************************************/
739 static int kaweth_close(struct net_device *net)
740 {
741         struct kaweth_device *kaweth = netdev_priv(net);
742 
743         netif_stop_queue(net);
744         kaweth->opened = 0;
745 
746         kaweth->status |= KAWETH_STATUS_CLOSING;
747 
748         kaweth_kill_urbs(kaweth);
749 
750         kaweth->status &= ~KAWETH_STATUS_CLOSING;
751 
752         usb_autopm_put_interface(kaweth->intf);
753 
754         return 0;
755 }
756 
757 static u32 kaweth_get_link(struct net_device *dev)
758 {
759         struct kaweth_device *kaweth = netdev_priv(dev);
760 
761         return kaweth->linkstate;
762 }
763 
764 static const struct ethtool_ops ops = {
765         .get_link       = kaweth_get_link
766 };
767 
768 /****************************************************************
769  *     kaweth_usb_transmit_complete
770  ****************************************************************/
771 static void kaweth_usb_transmit_complete(struct urb *urb)
772 {
773         struct kaweth_device *kaweth = urb->context;
774         struct sk_buff *skb = kaweth->tx_skb;
775         int status = urb->status;
776 
777         if (unlikely(status != 0))
778                 if (status != -ENOENT)
779                         dev_dbg(&urb->dev->dev, "%s: TX status %d.\n",
780                                 kaweth->net->name, status);
781 
782         netif_wake_queue(kaweth->net);
783         dev_kfree_skb_irq(skb);
784 }
785 
786 /****************************************************************
787  *     kaweth_start_xmit
788  ****************************************************************/
789 static netdev_tx_t kaweth_start_xmit(struct sk_buff *skb,
790                                            struct net_device *net)
791 {
792         struct kaweth_device *kaweth = netdev_priv(net);
793         __le16 *private_header;
794 
795         int res;
796 
797         spin_lock_irq(&kaweth->device_lock);
798 
799         kaweth_async_set_rx_mode(kaweth);
800         netif_stop_queue(net);
801         if (IS_BLOCKED(kaweth->status)) {
802                 goto skip;
803         }
804 
805         /* We now decide whether we can put our special header into the sk_buff */
806         if (skb_cloned(skb) || skb_headroom(skb) < 2) {
807                 /* no such luck - we make our own */
808                 struct sk_buff *copied_skb;
809                 copied_skb = skb_copy_expand(skb, 2, 0, GFP_ATOMIC);
810                 dev_kfree_skb_irq(skb);
811                 skb = copied_skb;
812                 if (!copied_skb) {
813                         kaweth->stats.tx_errors++;
814                         netif_start_queue(net);
815                         spin_unlock_irq(&kaweth->device_lock);
816                         return NETDEV_TX_OK;
817                 }
818         }
819 
820         private_header = (__le16 *)__skb_push(skb, 2);
821         *private_header = cpu_to_le16(skb->len-2);
822         kaweth->tx_skb = skb;
823 
824         usb_fill_bulk_urb(kaweth->tx_urb,
825                       kaweth->dev,
826                       usb_sndbulkpipe(kaweth->dev, 2),
827                       private_header,
828                       skb->len,
829                       kaweth_usb_transmit_complete,
830                       kaweth);
831         kaweth->end = 0;
832 
833         if((res = usb_submit_urb(kaweth->tx_urb, GFP_ATOMIC)))
834         {
835                 dev_warn(&net->dev, "kaweth failed tx_urb %d\n", res);
836 skip:
837                 kaweth->stats.tx_errors++;
838 
839                 netif_start_queue(net);
840                 dev_kfree_skb_irq(skb);
841         }
842         else
843         {
844                 kaweth->stats.tx_packets++;
845                 kaweth->stats.tx_bytes += skb->len;
846         }
847 
848         spin_unlock_irq(&kaweth->device_lock);
849 
850         return NETDEV_TX_OK;
851 }
852 
853 /****************************************************************
854  *     kaweth_set_rx_mode
855  ****************************************************************/
856 static void kaweth_set_rx_mode(struct net_device *net)
857 {
858         struct kaweth_device *kaweth = netdev_priv(net);
859 
860         __u16 packet_filter_bitmap = KAWETH_PACKET_FILTER_DIRECTED |
861                                      KAWETH_PACKET_FILTER_BROADCAST |
862                                      KAWETH_PACKET_FILTER_MULTICAST;
863 
864         netdev_dbg(net, "Setting Rx mode to %d\n", packet_filter_bitmap);
865 
866         netif_stop_queue(net);
867 
868         if (net->flags & IFF_PROMISC) {
869                 packet_filter_bitmap |= KAWETH_PACKET_FILTER_PROMISCUOUS;
870         }
871         else if (!netdev_mc_empty(net) || (net->flags & IFF_ALLMULTI)) {
872                 packet_filter_bitmap |= KAWETH_PACKET_FILTER_ALL_MULTICAST;
873         }
874 
875         kaweth->packet_filter_bitmap = packet_filter_bitmap;
876         netif_wake_queue(net);
877 }
878 
879 /****************************************************************
880  *     kaweth_async_set_rx_mode
881  ****************************************************************/
882 static void kaweth_async_set_rx_mode(struct kaweth_device *kaweth)
883 {
884         int result;
885         __u16 packet_filter_bitmap = kaweth->packet_filter_bitmap;
886 
887         kaweth->packet_filter_bitmap = 0;
888         if (packet_filter_bitmap == 0)
889                 return;
890 
891         if (in_interrupt())
892                 return;
893 
894         result = kaweth_control(kaweth,
895                                 usb_sndctrlpipe(kaweth->dev, 0),
896                                 KAWETH_COMMAND_SET_PACKET_FILTER,
897                                 USB_TYPE_VENDOR | USB_DIR_OUT | USB_RECIP_DEVICE,
898                                 packet_filter_bitmap,
899                                 0,
900                                 (void *)&kaweth->scratch,
901                                 0,
902                                 KAWETH_CONTROL_TIMEOUT);
903 
904         if(result < 0) {
905                 dev_err(&kaweth->intf->dev, "Failed to set Rx mode: %d\n",
906                         result);
907         }
908         else {
909                 netdev_dbg(kaweth->net, "Set Rx mode to %d\n",
910                            packet_filter_bitmap);
911         }
912 }
913 
914 /****************************************************************
915  *     kaweth_netdev_stats
916  ****************************************************************/
917 static struct net_device_stats *kaweth_netdev_stats(struct net_device *dev)
918 {
919         struct kaweth_device *kaweth = netdev_priv(dev);
920         return &kaweth->stats;
921 }
922 
923 /****************************************************************
924  *     kaweth_tx_timeout
925  ****************************************************************/
926 static void kaweth_tx_timeout(struct net_device *net)
927 {
928         struct kaweth_device *kaweth = netdev_priv(net);
929 
930         dev_warn(&net->dev, "%s: Tx timed out. Resetting.\n", net->name);
931         kaweth->stats.tx_errors++;
932         netif_trans_update(net);
933 
934         usb_unlink_urb(kaweth->tx_urb);
935 }
936 
937 /****************************************************************
938  *     kaweth_suspend
939  ****************************************************************/
940 static int kaweth_suspend(struct usb_interface *intf, pm_message_t message)
941 {
942         struct kaweth_device *kaweth = usb_get_intfdata(intf);
943         unsigned long flags;
944 
945         spin_lock_irqsave(&kaweth->device_lock, flags);
946         kaweth->status |= KAWETH_STATUS_SUSPENDING;
947         spin_unlock_irqrestore(&kaweth->device_lock, flags);
948 
949         kaweth_kill_urbs(kaweth);
950         return 0;
951 }
952 
953 /****************************************************************
954  *     kaweth_resume
955  ****************************************************************/
956 static int kaweth_resume(struct usb_interface *intf)
957 {
958         struct kaweth_device *kaweth = usb_get_intfdata(intf);
959         unsigned long flags;
960 
961         spin_lock_irqsave(&kaweth->device_lock, flags);
962         kaweth->status &= ~KAWETH_STATUS_SUSPENDING;
963         spin_unlock_irqrestore(&kaweth->device_lock, flags);
964 
965         if (!kaweth->opened)
966                 return 0;
967         kaweth_resubmit_rx_urb(kaweth, GFP_NOIO);
968         kaweth_resubmit_int_urb(kaweth, GFP_NOIO);
969 
970         return 0;
971 }
972 
973 /****************************************************************
974  *     kaweth_probe
975  ****************************************************************/
976 
977 
978 static const struct net_device_ops kaweth_netdev_ops = {
979         .ndo_open =                     kaweth_open,
980         .ndo_stop =                     kaweth_close,
981         .ndo_start_xmit =               kaweth_start_xmit,
982         .ndo_tx_timeout =               kaweth_tx_timeout,
983         .ndo_set_rx_mode =              kaweth_set_rx_mode,
984         .ndo_get_stats =                kaweth_netdev_stats,
985         .ndo_change_mtu =               eth_change_mtu,
986         .ndo_set_mac_address =          eth_mac_addr,
987         .ndo_validate_addr =            eth_validate_addr,
988 };
989 
990 static int kaweth_probe(
991                 struct usb_interface *intf,
992                 const struct usb_device_id *id      /* from id_table */
993         )
994 {
995         struct device *dev = &intf->dev;
996         struct usb_device *udev = interface_to_usbdev(intf);
997         struct kaweth_device *kaweth;
998         struct net_device *netdev;
999         const eth_addr_t bcast_addr = { 0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF };
1000         int result = 0;
1001         int rv = -EIO;
1002 
1003         dev_dbg(dev,
1004                 "Kawasaki Device Probe (Device number:%d): 0x%4.4x:0x%4.4x:0x%4.4x\n",
1005                 udev->devnum, le16_to_cpu(udev->descriptor.idVendor),
1006                 le16_to_cpu(udev->descriptor.idProduct),
1007                 le16_to_cpu(udev->descriptor.bcdDevice));
1008 
1009         dev_dbg(dev, "Device at %p\n", udev);
1010 
1011         dev_dbg(dev, "Descriptor length: %x type: %x\n",
1012                 (int)udev->descriptor.bLength,
1013                 (int)udev->descriptor.bDescriptorType);
1014 
1015         netdev = alloc_etherdev(sizeof(*kaweth));
1016         if (!netdev)
1017                 return -ENOMEM;
1018 
1019         kaweth = netdev_priv(netdev);
1020         kaweth->dev = udev;
1021         kaweth->net = netdev;
1022         kaweth->intf = intf;
1023 
1024         spin_lock_init(&kaweth->device_lock);
1025         init_waitqueue_head(&kaweth->term_wait);
1026 
1027         dev_dbg(dev, "Resetting.\n");
1028 
1029         kaweth_reset(kaweth);
1030 
1031         /*
1032          * If high byte of bcdDevice is nonzero, firmware is already
1033          * downloaded. Don't try to do it again, or we'll hang the device.
1034          */
1035 
1036         if (le16_to_cpu(udev->descriptor.bcdDevice) >> 8) {
1037                 dev_info(dev, "Firmware present in device.\n");
1038         } else {
1039                 /* Download the firmware */
1040                 dev_info(dev, "Downloading firmware...\n");
1041                 kaweth->firmware_buf = (__u8 *)__get_free_page(GFP_KERNEL);
1042                 if (!kaweth->firmware_buf) {
1043                         rv = -ENOMEM;
1044                         goto err_free_netdev;
1045                 }
1046                 if ((result = kaweth_download_firmware(kaweth,
1047                                                       "kaweth/new_code.bin",
1048                                                       100,
1049                                                       2)) < 0) {
1050                         dev_err(dev, "Error downloading firmware (%d)\n",
1051                                 result);
1052                         goto err_fw;
1053                 }
1054 
1055                 if ((result = kaweth_download_firmware(kaweth,
1056                                                       "kaweth/new_code_fix.bin",
1057                                                       100,
1058                                                       3)) < 0) {
1059                         dev_err(dev, "Error downloading firmware fix (%d)\n",
1060                                 result);
1061                         goto err_fw;
1062                 }
1063 
1064                 if ((result = kaweth_download_firmware(kaweth,
1065                                                       "kaweth/trigger_code.bin",
1066                                                       126,
1067                                                       2)) < 0) {
1068                         dev_err(dev, "Error downloading trigger code (%d)\n",
1069                                 result);
1070                         goto err_fw;
1071 
1072                 }
1073 
1074                 if ((result = kaweth_download_firmware(kaweth,
1075                                                       "kaweth/trigger_code_fix.bin",
1076                                                       126,
1077                                                       3)) < 0) {
1078                         dev_err(dev, "Error downloading trigger code fix (%d)\n", result);
1079                         goto err_fw;
1080                 }
1081 
1082 
1083                 if ((result = kaweth_trigger_firmware(kaweth, 126)) < 0) {
1084                         dev_err(dev, "Error triggering firmware (%d)\n", result);
1085                         goto err_fw;
1086                 }
1087 
1088                 /* Device will now disappear for a moment...  */
1089                 dev_info(dev, "Firmware loaded.  I'll be back...\n");
1090 err_fw:
1091                 free_page((unsigned long)kaweth->firmware_buf);
1092                 free_netdev(netdev);
1093                 return -EIO;
1094         }
1095 
1096         result = kaweth_read_configuration(kaweth);
1097 
1098         if(result < 0) {
1099                 dev_err(dev, "Error reading configuration (%d), no net device created\n", result);
1100                 goto err_free_netdev;
1101         }
1102 
1103         dev_info(dev, "Statistics collection: %x\n", kaweth->configuration.statistics_mask);
1104         dev_info(dev, "Multicast filter limit: %x\n", kaweth->configuration.max_multicast_filters & ((1 << 15) - 1));
1105         dev_info(dev, "MTU: %d\n", le16_to_cpu(kaweth->configuration.segment_size));
1106         dev_info(dev, "Read MAC address %pM\n", kaweth->configuration.hw_addr);
1107 
1108         if(!memcmp(&kaweth->configuration.hw_addr,
1109                    &bcast_addr,
1110                    sizeof(bcast_addr))) {
1111                 dev_err(dev, "Firmware not functioning properly, no net device created\n");
1112                 goto err_free_netdev;
1113         }
1114 
1115         if(kaweth_set_urb_size(kaweth, KAWETH_BUF_SIZE) < 0) {
1116                 dev_dbg(dev, "Error setting URB size\n");
1117                 goto err_free_netdev;
1118         }
1119 
1120         if(kaweth_set_sofs_wait(kaweth, KAWETH_SOFS_TO_WAIT) < 0) {
1121                 dev_err(dev, "Error setting SOFS wait\n");
1122                 goto err_free_netdev;
1123         }
1124 
1125         result = kaweth_set_receive_filter(kaweth,
1126                                            KAWETH_PACKET_FILTER_DIRECTED |
1127                                            KAWETH_PACKET_FILTER_BROADCAST |
1128                                            KAWETH_PACKET_FILTER_MULTICAST);
1129 
1130         if(result < 0) {
1131                 dev_err(dev, "Error setting receive filter\n");
1132                 goto err_free_netdev;
1133         }
1134 
1135         dev_dbg(dev, "Initializing net device.\n");
1136 
1137         kaweth->tx_urb = usb_alloc_urb(0, GFP_KERNEL);
1138         if (!kaweth->tx_urb)
1139                 goto err_free_netdev;
1140         kaweth->rx_urb = usb_alloc_urb(0, GFP_KERNEL);
1141         if (!kaweth->rx_urb)
1142                 goto err_only_tx;
1143         kaweth->irq_urb = usb_alloc_urb(0, GFP_KERNEL);
1144         if (!kaweth->irq_urb)
1145                 goto err_tx_and_rx;
1146 
1147         kaweth->intbuffer = usb_alloc_coherent( kaweth->dev,
1148                                                 INTBUFFERSIZE,
1149                                                 GFP_KERNEL,
1150                                                 &kaweth->intbufferhandle);
1151         if (!kaweth->intbuffer)
1152                 goto err_tx_and_rx_and_irq;
1153         kaweth->rx_buf = usb_alloc_coherent(    kaweth->dev,
1154                                                 KAWETH_BUF_SIZE,
1155                                                 GFP_KERNEL,
1156                                                 &kaweth->rxbufferhandle);
1157         if (!kaweth->rx_buf)
1158                 goto err_all_but_rxbuf;
1159 
1160         memcpy(netdev->broadcast, &bcast_addr, sizeof(bcast_addr));
1161         memcpy(netdev->dev_addr, &kaweth->configuration.hw_addr,
1162                sizeof(kaweth->configuration.hw_addr));
1163 
1164         netdev->netdev_ops = &kaweth_netdev_ops;
1165         netdev->watchdog_timeo = KAWETH_TX_TIMEOUT;
1166         netdev->mtu = le16_to_cpu(kaweth->configuration.segment_size);
1167         netdev->ethtool_ops = &ops;
1168 
1169         /* kaweth is zeroed as part of alloc_netdev */
1170         INIT_DELAYED_WORK(&kaweth->lowmem_work, kaweth_resubmit_tl);
1171         usb_set_intfdata(intf, kaweth);
1172 
1173         SET_NETDEV_DEV(netdev, dev);
1174         if (register_netdev(netdev) != 0) {
1175                 dev_err(dev, "Error registering netdev.\n");
1176                 goto err_intfdata;
1177         }
1178 
1179         dev_info(dev, "kaweth interface created at %s\n",
1180                  kaweth->net->name);
1181 
1182         return 0;
1183 
1184 err_intfdata:
1185         usb_set_intfdata(intf, NULL);
1186         usb_free_coherent(kaweth->dev, KAWETH_BUF_SIZE, (void *)kaweth->rx_buf, kaweth->rxbufferhandle);
1187 err_all_but_rxbuf:
1188         usb_free_coherent(kaweth->dev, INTBUFFERSIZE, (void *)kaweth->intbuffer, kaweth->intbufferhandle);
1189 err_tx_and_rx_and_irq:
1190         usb_free_urb(kaweth->irq_urb);
1191 err_tx_and_rx:
1192         usb_free_urb(kaweth->rx_urb);
1193 err_only_tx:
1194         usb_free_urb(kaweth->tx_urb);
1195 err_free_netdev:
1196         free_netdev(netdev);
1197 
1198         return rv;
1199 }
1200 
1201 /****************************************************************
1202  *     kaweth_disconnect
1203  ****************************************************************/
1204 static void kaweth_disconnect(struct usb_interface *intf)
1205 {
1206         struct kaweth_device *kaweth = usb_get_intfdata(intf);
1207         struct net_device *netdev;
1208 
1209         usb_set_intfdata(intf, NULL);
1210         if (!kaweth) {
1211                 dev_warn(&intf->dev, "unregistering non-existent device\n");
1212                 return;
1213         }
1214         netdev = kaweth->net;
1215 
1216         netdev_dbg(kaweth->net, "Unregistering net device\n");
1217         unregister_netdev(netdev);
1218 
1219         usb_free_urb(kaweth->rx_urb);
1220         usb_free_urb(kaweth->tx_urb);
1221         usb_free_urb(kaweth->irq_urb);
1222 
1223         usb_free_coherent(kaweth->dev, KAWETH_BUF_SIZE, (void *)kaweth->rx_buf, kaweth->rxbufferhandle);
1224         usb_free_coherent(kaweth->dev, INTBUFFERSIZE, (void *)kaweth->intbuffer, kaweth->intbufferhandle);
1225 
1226         free_netdev(netdev);
1227 }
1228 
1229 
1230 // FIXME this completion stuff is a modified clone of
1231 // an OLD version of some stuff in usb.c ...
1232 struct usb_api_data {
1233         wait_queue_head_t wqh;
1234         int done;
1235 };
1236 
1237 /*-------------------------------------------------------------------*
1238  * completion handler for compatibility wrappers (sync control/bulk) *
1239  *-------------------------------------------------------------------*/
1240 static void usb_api_blocking_completion(struct urb *urb)
1241 {
1242         struct usb_api_data *awd = (struct usb_api_data *)urb->context;
1243 
1244         awd->done=1;
1245         wake_up(&awd->wqh);
1246 }
1247 
1248 /*-------------------------------------------------------------------*
1249  *                         COMPATIBILITY STUFF                       *
1250  *-------------------------------------------------------------------*/
1251 
1252 // Starts urb and waits for completion or timeout
1253 static int usb_start_wait_urb(struct urb *urb, int timeout, int* actual_length)
1254 {
1255         struct usb_api_data awd;
1256         int status;
1257 
1258         init_waitqueue_head(&awd.wqh);
1259         awd.done = 0;
1260 
1261         urb->context = &awd;
1262         status = usb_submit_urb(urb, GFP_ATOMIC);
1263         if (status) {
1264                 // something went wrong
1265                 usb_free_urb(urb);
1266                 return status;
1267         }
1268 
1269         if (!wait_event_timeout(awd.wqh, awd.done, timeout)) {
1270                 // timeout
1271                 dev_warn(&urb->dev->dev, "usb_control/bulk_msg: timeout\n");
1272                 usb_kill_urb(urb);  // remove urb safely
1273                 status = -ETIMEDOUT;
1274         }
1275         else {
1276                 status = urb->status;
1277         }
1278 
1279         if (actual_length) {
1280                 *actual_length = urb->actual_length;
1281         }
1282 
1283         usb_free_urb(urb);
1284         return status;
1285 }
1286 
1287 /*-------------------------------------------------------------------*/
1288 // returns status (negative) or length (positive)
1289 static int kaweth_internal_control_msg(struct usb_device *usb_dev,
1290                                        unsigned int pipe,
1291                                        struct usb_ctrlrequest *cmd, void *data,
1292                                        int len, int timeout)
1293 {
1294         struct urb *urb;
1295         int retv;
1296         int length = 0; /* shut up GCC */
1297 
1298         urb = usb_alloc_urb(0, GFP_ATOMIC);
1299         if (!urb)
1300                 return -ENOMEM;
1301 
1302         usb_fill_control_urb(urb, usb_dev, pipe, (unsigned char*)cmd, data,
1303                          len, usb_api_blocking_completion, NULL);
1304 
1305         retv = usb_start_wait_urb(urb, timeout, &length);
1306         if (retv < 0) {
1307                 return retv;
1308         }
1309         else {
1310                 return length;
1311         }
1312 }
1313 
1314 module_usb_driver(kaweth_driver);
1315 

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