IRQ: Maintain regs pointer globally rather than passing to IRQ handlers
[linux-2.6.git] / drivers / net / irda / irda-usb.c
1 /*****************************************************************************
2  *
3  * Filename:      irda-usb.c
4  * Version:       0.10
5  * Description:   IrDA-USB Driver
6  * Status:        Experimental 
7  * Author:        Dag Brattli <dag@brattli.net>
8  *
9  *      Copyright (C) 2000, Roman Weissgaerber <weissg@vienna.at>
10  *      Copyright (C) 2001, Dag Brattli <dag@brattli.net>
11  *      Copyright (C) 2001, Jean Tourrilhes <jt@hpl.hp.com>
12  *      Copyright (C) 2004, SigmaTel, Inc. <irquality@sigmatel.com>
13  *      Copyright (C) 2005, Milan Beno <beno@pobox.sk>
14  *      Copyright (C) 2006, Nick Fedchik <nick@fedchik.org.ua>
15  *          
16  *      This program is free software; you can redistribute it and/or modify
17  *      it under the terms of the GNU General Public License as published by
18  *      the Free Software Foundation; either version 2 of the License, or
19  *      (at your option) any later version.
20  *
21  *      This program is distributed in the hope that it will be useful,
22  *      but WITHOUT ANY WARRANTY; without even the implied warranty of
23  *      MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
24  *      GNU General Public License for more details.
25  *
26  *      You should have received a copy of the GNU General Public License
27  *      along with this program; if not, write to the Free Software
28  *      Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
29  *
30  *****************************************************************************/
31
32 /*
33  *                          IMPORTANT NOTE
34  *                          --------------
35  *
36  * As of kernel 2.5.20, this is the state of compliance and testing of
37  * this driver (irda-usb) with regards to the USB low level drivers...
38  *
39  * This driver has been tested SUCCESSFULLY with the following drivers :
40  *      o usb-uhci-hcd  (For Intel/Via USB controllers)
41  *      o uhci-hcd      (Alternate/JE driver for Intel/Via USB controllers)
42  *      o ohci-hcd      (For other USB controllers)
43  *
44  * This driver has NOT been tested with the following drivers :
45  *      o ehci-hcd      (USB 2.0 controllers)
46  *
47  * Note that all HCD drivers do URB_ZERO_PACKET and timeout properly,
48  * so we don't have to worry about that anymore.
49  * One common problem is the failure to set the address on the dongle,
50  * but this happens before the driver gets loaded...
51  *
52  * Jean II
53  */
54
55 /*------------------------------------------------------------------*/
56
57 #include <linux/module.h>
58 #include <linux/moduleparam.h>
59 #include <linux/kernel.h>
60 #include <linux/types.h>
61 #include <linux/init.h>
62 #include <linux/skbuff.h>
63 #include <linux/netdevice.h>
64 #include <linux/slab.h>
65 #include <linux/rtnetlink.h>
66 #include <linux/usb.h>
67 #include <linux/firmware.h>
68
69 #include "irda-usb.h"
70
71 /*------------------------------------------------------------------*/
72
73 static int qos_mtt_bits = 0;
74
75 /* These are the currently known IrDA USB dongles. Add new dongles here */
76 static struct usb_device_id dongles[] = {
77         /* ACTiSYS Corp.,  ACT-IR2000U FIR-USB Adapter */
78         { USB_DEVICE(0x9c4, 0x011), .driver_info = IUC_SPEED_BUG | IUC_NO_WINDOW },
79         /* Look like ACTiSYS, Report : IBM Corp., IBM UltraPort IrDA */
80         { USB_DEVICE(0x4428, 0x012), .driver_info = IUC_SPEED_BUG | IUC_NO_WINDOW },
81         /* KC Technology Inc.,  KC-180 USB IrDA Device */
82         { USB_DEVICE(0x50f, 0x180), .driver_info = IUC_SPEED_BUG | IUC_NO_WINDOW },
83         /* Extended Systems, Inc.,  XTNDAccess IrDA USB (ESI-9685) */
84         { USB_DEVICE(0x8e9, 0x100), .driver_info = IUC_SPEED_BUG | IUC_NO_WINDOW },
85         /* SigmaTel STIR4210/4220/4116 USB IrDA (VFIR) Bridge */
86         { USB_DEVICE(0x66f, 0x4210), .driver_info = IUC_STIR421X | IUC_SPEED_BUG },
87         { USB_DEVICE(0x66f, 0x4220), .driver_info = IUC_STIR421X | IUC_SPEED_BUG },
88         { USB_DEVICE(0x66f, 0x4116), .driver_info = IUC_STIR421X | IUC_SPEED_BUG },
89         { .match_flags = USB_DEVICE_ID_MATCH_INT_CLASS |
90           USB_DEVICE_ID_MATCH_INT_SUBCLASS,
91           .bInterfaceClass = USB_CLASS_APP_SPEC,
92           .bInterfaceSubClass = USB_CLASS_IRDA,
93           .driver_info = IUC_DEFAULT, },
94         { }, /* The end */
95 };
96
97 /*
98  * Important note :
99  * Devices based on the SigmaTel chipset (0x66f, 0x4200) are not designed
100  * using the "USB-IrDA specification" (yes, there exist such a thing), and
101  * therefore not supported by this driver (don't add them above).
102  * There is a Linux driver, stir4200, that support those USB devices.
103  * Jean II
104  */
105
106 MODULE_DEVICE_TABLE(usb, dongles);
107
108 /*------------------------------------------------------------------*/
109
110 static void irda_usb_init_qos(struct irda_usb_cb *self) ;
111 static struct irda_class_desc *irda_usb_find_class_desc(struct usb_interface *intf);
112 static void irda_usb_disconnect(struct usb_interface *intf);
113 static void irda_usb_change_speed_xbofs(struct irda_usb_cb *self);
114 static int irda_usb_hard_xmit(struct sk_buff *skb, struct net_device *dev);
115 static int irda_usb_open(struct irda_usb_cb *self);
116 static void irda_usb_close(struct irda_usb_cb *self);
117 static void speed_bulk_callback(struct urb *urb);
118 static void write_bulk_callback(struct urb *urb);
119 static void irda_usb_receive(struct urb *urb);
120 static void irda_usb_rx_defer_expired(unsigned long data);
121 static int irda_usb_net_open(struct net_device *dev);
122 static int irda_usb_net_close(struct net_device *dev);
123 static int irda_usb_net_ioctl(struct net_device *dev, struct ifreq *rq, int cmd);
124 static void irda_usb_net_timeout(struct net_device *dev);
125 static struct net_device_stats *irda_usb_net_get_stats(struct net_device *dev);
126
127 /************************ TRANSMIT ROUTINES ************************/
128 /*
129  * Receive packets from the IrDA stack and send them on the USB pipe.
130  * Handle speed change, timeout and lot's of ugliness...
131  */
132
133 /*------------------------------------------------------------------*/
134 /*
135  * Function irda_usb_build_header(self, skb, header)
136  *
137  *   Builds USB-IrDA outbound header
138  *
139  * When we send an IrDA frame over an USB pipe, we add to it a 1 byte
140  * header. This function create this header with the proper values.
141  *
142  * Important note : the USB-IrDA spec 1.0 say very clearly in chapter 5.4.2.2
143  * that the setting of the link speed and xbof number in this outbound header
144  * should be applied *AFTER* the frame has been sent.
145  * Unfortunately, some devices are not compliant with that... It seems that
146  * reading the spec is far too difficult...
147  * Jean II
148  */
149 static void irda_usb_build_header(struct irda_usb_cb *self,
150                                   __u8 *header,
151                                   int   force)
152 {
153         /* Here we check if we have an STIR421x chip,
154          * and if either speed or xbofs (or both) needs
155          * to be changed.
156          */
157         if (self->capability & IUC_STIR421X &&
158             ((self->new_speed != -1) || (self->new_xbofs != -1))) {
159
160                 /* With STIR421x, speed and xBOFs must be set at the same
161                  * time, even if only one of them changes.
162                  */
163                 if (self->new_speed == -1)
164                         self->new_speed = self->speed ;
165
166                 if (self->new_xbofs == -1)
167                         self->new_xbofs = self->xbofs ;
168         }
169
170         /* Set the link speed */
171         if (self->new_speed != -1) {
172                 /* Hum... Ugly hack :-(
173                  * Some device are not compliant with the spec and change
174                  * parameters *before* sending the frame. - Jean II
175                  */
176                 if ((self->capability & IUC_SPEED_BUG) &&
177                     (!force) && (self->speed != -1)) {
178                         /* No speed and xbofs change here
179                          * (we'll do it later in the write callback) */
180                         IRDA_DEBUG(2, "%s(), not changing speed yet\n", __FUNCTION__);
181                         *header = 0;
182                         return;
183                 }
184
185                 IRDA_DEBUG(2, "%s(), changing speed to %d\n", __FUNCTION__, self->new_speed);
186                 self->speed = self->new_speed;
187                 /* We will do ` self->new_speed = -1; ' in the completion
188                  * handler just in case the current URB fail - Jean II */
189
190                 switch (self->speed) {
191                 case 2400:
192                         *header = SPEED_2400;
193                         break;
194                 default:
195                 case 9600:
196                         *header = SPEED_9600;
197                         break;
198                 case 19200:
199                         *header = SPEED_19200;
200                         break;
201                 case 38400:
202                         *header = SPEED_38400;
203                         break;
204                 case 57600:
205                         *header = SPEED_57600;
206                         break;
207                 case 115200:
208                         *header = SPEED_115200;
209                         break;
210                 case 576000:
211                         *header = SPEED_576000;
212                         break;
213                 case 1152000:
214                         *header = SPEED_1152000;
215                         break;
216                 case 4000000:
217                         *header = SPEED_4000000;
218                         self->new_xbofs = 0;
219                         break;
220                 case 16000000:
221                         *header = SPEED_16000000;
222                         self->new_xbofs = 0;
223                         break;
224                 }
225         } else
226                 /* No change */
227                 *header = 0;
228         
229         /* Set the negotiated additional XBOFS */
230         if (self->new_xbofs != -1) {
231                 IRDA_DEBUG(2, "%s(), changing xbofs to %d\n", __FUNCTION__, self->new_xbofs);
232                 self->xbofs = self->new_xbofs;
233                 /* We will do ` self->new_xbofs = -1; ' in the completion
234                  * handler just in case the current URB fail - Jean II */
235
236                 switch (self->xbofs) {
237                 case 48:
238                         *header |= 0x10;
239                         break;
240                 case 28:
241                 case 24:        /* USB spec 1.0 says 24 */
242                         *header |= 0x20;
243                         break;
244                 default:
245                 case 12:
246                         *header |= 0x30;
247                         break;
248                 case 5: /* Bug in IrLAP spec? (should be 6) */
249                 case 6:
250                         *header |= 0x40;
251                         break;
252                 case 3:
253                         *header |= 0x50;
254                         break;
255                 case 2:
256                         *header |= 0x60;
257                         break;
258                 case 1:
259                         *header |= 0x70;
260                         break;
261                 case 0:
262                         *header |= 0x80;
263                         break;
264                 }
265         }
266 }
267
268 /*
269 *   calculate turnaround time for SigmaTel header
270 */
271 static __u8 get_turnaround_time(struct sk_buff *skb)
272 {
273         int turnaround_time = irda_get_mtt(skb);
274
275         if ( turnaround_time == 0 )
276                 return 0;
277         else if ( turnaround_time <= 10 )
278                 return 1;
279         else if ( turnaround_time <= 50 )
280                 return 2;
281         else if ( turnaround_time <= 100 )
282                 return 3;
283         else if ( turnaround_time <= 500 )
284                 return 4;
285         else if ( turnaround_time <= 1000 )
286                 return 5;
287         else if ( turnaround_time <= 5000 )
288                 return 6;
289         else
290                 return 7;
291 }
292
293
294 /*------------------------------------------------------------------*/
295 /*
296  * Send a command to change the speed of the dongle
297  * Need to be called with spinlock on.
298  */
299 static void irda_usb_change_speed_xbofs(struct irda_usb_cb *self)
300 {
301         __u8 *frame;
302         struct urb *urb;
303         int ret;
304
305         IRDA_DEBUG(2, "%s(), speed=%d, xbofs=%d\n", __FUNCTION__,
306                    self->new_speed, self->new_xbofs);
307
308         /* Grab the speed URB */
309         urb = self->speed_urb;
310         if (urb->status != 0) {
311                 IRDA_WARNING("%s(), URB still in use!\n", __FUNCTION__);
312                 return;
313         }
314
315         /* Allocate the fake frame */
316         frame = self->speed_buff;
317
318         /* Set the new speed and xbofs in this fake frame */
319         irda_usb_build_header(self, frame, 1);
320
321         if (self->capability & IUC_STIR421X) {
322                 if (frame[0] == 0) return ; // do nothing if no change
323                 frame[1] = 0; // other parameters don't change here
324                 frame[2] = 0;
325         }
326
327         /* Submit the 0 length IrDA frame to trigger new speed settings */
328         usb_fill_bulk_urb(urb, self->usbdev,
329                       usb_sndbulkpipe(self->usbdev, self->bulk_out_ep),
330                       frame, IRDA_USB_SPEED_MTU,
331                       speed_bulk_callback, self);
332         urb->transfer_buffer_length = self->header_length;
333         urb->transfer_flags = 0;
334
335         /* Irq disabled -> GFP_ATOMIC */
336         if ((ret = usb_submit_urb(urb, GFP_ATOMIC))) {
337                 IRDA_WARNING("%s(), failed Speed URB\n", __FUNCTION__);
338         }
339 }
340
341 /*------------------------------------------------------------------*/
342 /*
343  * Speed URB callback
344  * Now, we can only get called for the speed URB.
345  */
346 static void speed_bulk_callback(struct urb *urb)
347 {
348         struct irda_usb_cb *self = urb->context;
349         
350         IRDA_DEBUG(2, "%s()\n", __FUNCTION__);
351
352         /* We should always have a context */
353         IRDA_ASSERT(self != NULL, return;);
354         /* We should always be called for the speed URB */
355         IRDA_ASSERT(urb == self->speed_urb, return;);
356
357         /* Check for timeout and other USB nasties */
358         if (urb->status != 0) {
359                 /* I get a lot of -ECONNABORTED = -103 here - Jean II */
360                 IRDA_DEBUG(0, "%s(), URB complete status %d, transfer_flags 0x%04X\n", __FUNCTION__, urb->status, urb->transfer_flags);
361
362                 /* Don't do anything here, that might confuse the USB layer.
363                  * Instead, we will wait for irda_usb_net_timeout(), the
364                  * network layer watchdog, to fix the situation.
365                  * Jean II */
366                 /* A reset of the dongle might be welcomed here - Jean II */
367                 return;
368         }
369
370         /* urb is now available */
371         //urb->status = 0; -> tested above
372
373         /* New speed and xbof is now commited in hardware */
374         self->new_speed = -1;
375         self->new_xbofs = -1;
376
377         /* Allow the stack to send more packets */
378         netif_wake_queue(self->netdev);
379 }
380
381 /*------------------------------------------------------------------*/
382 /*
383  * Send an IrDA frame to the USB dongle (for transmission)
384  */
385 static int irda_usb_hard_xmit(struct sk_buff *skb, struct net_device *netdev)
386 {
387         struct irda_usb_cb *self = netdev->priv;
388         struct urb *urb = self->tx_urb;
389         unsigned long flags;
390         s32 speed;
391         s16 xbofs;
392         int res, mtt;
393         int     err = 1;        /* Failed */
394
395         IRDA_DEBUG(4, "%s() on %s\n", __FUNCTION__, netdev->name);
396
397         netif_stop_queue(netdev);
398
399         /* Protect us from USB callbacks, net watchdog and else. */
400         spin_lock_irqsave(&self->lock, flags);
401
402         /* Check if the device is still there.
403          * We need to check self->present under the spinlock because
404          * of irda_usb_disconnect() is synchronous - Jean II */
405         if (!self->present) {
406                 IRDA_DEBUG(0, "%s(), Device is gone...\n", __FUNCTION__);
407                 goto drop;
408         }
409
410         /* Check if we need to change the number of xbofs */
411         xbofs = irda_get_next_xbofs(skb);
412         if ((xbofs != self->xbofs) && (xbofs != -1)) {
413                 self->new_xbofs = xbofs;
414         }
415
416         /* Check if we need to change the speed */
417         speed = irda_get_next_speed(skb);
418         if ((speed != self->speed) && (speed != -1)) {
419                 /* Set the desired speed */
420                 self->new_speed = speed;
421
422                 /* Check for empty frame */
423                 if (!skb->len) {
424                         /* IrLAP send us an empty frame to make us change the
425                          * speed. Changing speed with the USB adapter is in
426                          * fact sending an empty frame to the adapter, so we
427                          * could just let the present function do its job.
428                          * However, we would wait for min turn time,
429                          * do an extra memcpy and increment packet counters...
430                          * Jean II */
431                         irda_usb_change_speed_xbofs(self);
432                         netdev->trans_start = jiffies;
433                         /* Will netif_wake_queue() in callback */
434                         err = 0;        /* No error */
435                         goto drop;
436                 }
437         }
438
439         if (urb->status != 0) {
440                 IRDA_WARNING("%s(), URB still in use!\n", __FUNCTION__);
441                 goto drop;
442         }
443
444         /* Make sure there is room for IrDA-USB header. The actual
445          * allocation will be done lower in skb_push().
446          * Also, we don't use directly skb_cow(), because it require
447          * headroom >= 16, which force unnecessary copies - Jean II */
448         if (skb_headroom(skb) < self->header_length) {
449                 IRDA_DEBUG(0, "%s(), Insuficient skb headroom.\n", __FUNCTION__);
450                 if (skb_cow(skb, self->header_length)) {
451                         IRDA_WARNING("%s(), failed skb_cow() !!!\n", __FUNCTION__);
452                         goto drop;
453                 }
454         }
455
456         /* Change setting for next frame */
457
458         if (self->capability & IUC_STIR421X) {
459                 __u8 turnaround_time;
460                 __u8* frame;
461                 turnaround_time = get_turnaround_time( skb );
462                 frame= skb_push(skb, self->header_length);
463                 irda_usb_build_header(self, frame, 0);
464                 frame[2] = turnaround_time;
465                 if ((skb->len != 0) &&
466                     ((skb->len % 128) == 0) &&
467                     ((skb->len % 512) != 0)) {
468                         /* add extra byte for special SigmaTel feature */
469                         frame[1] = 1;
470                         skb_put(skb, 1);
471                 } else {
472                         frame[1] = 0;
473                 }
474         } else {
475                 irda_usb_build_header(self, skb_push(skb, self->header_length), 0);
476         }
477
478         /* FIXME: Make macro out of this one */
479         ((struct irda_skb_cb *)skb->cb)->context = self;
480
481         usb_fill_bulk_urb(urb, self->usbdev, 
482                       usb_sndbulkpipe(self->usbdev, self->bulk_out_ep),
483                       skb->data, IRDA_SKB_MAX_MTU,
484                       write_bulk_callback, skb);
485         urb->transfer_buffer_length = skb->len;
486         /* This flag (URB_ZERO_PACKET) indicates that what we send is not
487          * a continuous stream of data but separate packets.
488          * In this case, the USB layer will insert an empty USB frame (TD)
489          * after each of our packets that is exact multiple of the frame size.
490          * This is how the dongle will detect the end of packet - Jean II */
491         urb->transfer_flags = URB_ZERO_PACKET;
492
493         /* Generate min turn time. FIXME: can we do better than this? */
494         /* Trying to a turnaround time at this level is trying to measure
495          * processor clock cycle with a wrist-watch, approximate at best...
496          *
497          * What we know is the last time we received a frame over USB.
498          * Due to latency over USB that depend on the USB load, we don't
499          * know when this frame was received over IrDA (a few ms before ?)
500          * Then, same story for our outgoing frame...
501          *
502          * In theory, the USB dongle is supposed to handle the turnaround
503          * by itself (spec 1.0, chater 4, page 6). Who knows ??? That's
504          * why this code is enabled only for dongles that doesn't meet
505          * the spec.
506          * Jean II */
507         if (self->capability & IUC_NO_TURN) {
508                 mtt = irda_get_mtt(skb);
509                 if (mtt) {
510                         int diff;
511                         do_gettimeofday(&self->now);
512                         diff = self->now.tv_usec - self->stamp.tv_usec;
513 #ifdef IU_USB_MIN_RTT
514                         /* Factor in USB delays -> Get rid of udelay() that
515                          * would be lost in the noise - Jean II */
516                         diff += IU_USB_MIN_RTT;
517 #endif /* IU_USB_MIN_RTT */
518                         /* If the usec counter did wraparound, the diff will
519                          * go negative (tv_usec is a long), so we need to
520                          * correct it by one second. Jean II */
521                         if (diff < 0)
522                                 diff += 1000000;
523
524                         /* Check if the mtt is larger than the time we have
525                          * already used by all the protocol processing
526                          */
527                         if (mtt > diff) {
528                                 mtt -= diff;
529                                 if (mtt > 1000)
530                                         mdelay(mtt/1000);
531                                 else
532                                         udelay(mtt);
533                         }
534                 }
535         }
536         
537         /* Ask USB to send the packet - Irq disabled -> GFP_ATOMIC */
538         if ((res = usb_submit_urb(urb, GFP_ATOMIC))) {
539                 IRDA_WARNING("%s(), failed Tx URB\n", __FUNCTION__);
540                 self->stats.tx_errors++;
541                 /* Let USB recover : We will catch that in the watchdog */
542                 /*netif_start_queue(netdev);*/
543         } else {
544                 /* Increment packet stats */
545                 self->stats.tx_packets++;
546                 self->stats.tx_bytes += skb->len;
547                 
548                 netdev->trans_start = jiffies;
549         }
550         spin_unlock_irqrestore(&self->lock, flags);
551         
552         return 0;
553
554 drop:
555         /* Drop silently the skb and exit */
556         dev_kfree_skb(skb);
557         spin_unlock_irqrestore(&self->lock, flags);
558         return err;             /* Usually 1 */
559 }
560
561 /*------------------------------------------------------------------*/
562 /*
563  * Note : this function will be called only for tx_urb...
564  */
565 static void write_bulk_callback(struct urb *urb)
566 {
567         unsigned long flags;
568         struct sk_buff *skb = urb->context;
569         struct irda_usb_cb *self = ((struct irda_skb_cb *) skb->cb)->context;
570         
571         IRDA_DEBUG(2, "%s()\n", __FUNCTION__);
572
573         /* We should always have a context */
574         IRDA_ASSERT(self != NULL, return;);
575         /* We should always be called for the speed URB */
576         IRDA_ASSERT(urb == self->tx_urb, return;);
577
578         /* Free up the skb */
579         dev_kfree_skb_any(skb);
580         urb->context = NULL;
581
582         /* Check for timeout and other USB nasties */
583         if (urb->status != 0) {
584                 /* I get a lot of -ECONNABORTED = -103 here - Jean II */
585                 IRDA_DEBUG(0, "%s(), URB complete status %d, transfer_flags 0x%04X\n", __FUNCTION__, urb->status, urb->transfer_flags);
586
587                 /* Don't do anything here, that might confuse the USB layer,
588                  * and we could go in recursion and blow the kernel stack...
589                  * Instead, we will wait for irda_usb_net_timeout(), the
590                  * network layer watchdog, to fix the situation.
591                  * Jean II */
592                 /* A reset of the dongle might be welcomed here - Jean II */
593                 return;
594         }
595
596         /* urb is now available */
597         //urb->status = 0; -> tested above
598
599         /* Make sure we read self->present properly */
600         spin_lock_irqsave(&self->lock, flags);
601
602         /* If the network is closed, stop everything */
603         if ((!self->netopen) || (!self->present)) {
604                 IRDA_DEBUG(0, "%s(), Network is gone...\n", __FUNCTION__);
605                 spin_unlock_irqrestore(&self->lock, flags);
606                 return;
607         }
608
609         /* If changes to speed or xbofs is pending... */
610         if ((self->new_speed != -1) || (self->new_xbofs != -1)) {
611                 if ((self->new_speed != self->speed) ||
612                     (self->new_xbofs != self->xbofs)) {
613                         /* We haven't changed speed yet (because of
614                          * IUC_SPEED_BUG), so do it now - Jean II */
615                         IRDA_DEBUG(1, "%s(), Changing speed now...\n", __FUNCTION__);
616                         irda_usb_change_speed_xbofs(self);
617                 } else {
618                         /* New speed and xbof is now commited in hardware */
619                         self->new_speed = -1;
620                         self->new_xbofs = -1;
621                         /* Done, waiting for next packet */
622                         netif_wake_queue(self->netdev);
623                 }
624         } else {
625                 /* Otherwise, allow the stack to send more packets */
626                 netif_wake_queue(self->netdev);
627         }
628         spin_unlock_irqrestore(&self->lock, flags);
629 }
630
631 /*------------------------------------------------------------------*/
632 /*
633  * Watchdog timer from the network layer.
634  * After a predetermined timeout, if we don't give confirmation that
635  * the packet has been sent (i.e. no call to netif_wake_queue()),
636  * the network layer will call this function.
637  * Note that URB that we submit have also a timeout. When the URB timeout
638  * expire, the normal URB callback is called (write_bulk_callback()).
639  */
640 static void irda_usb_net_timeout(struct net_device *netdev)
641 {
642         unsigned long flags;
643         struct irda_usb_cb *self = netdev->priv;
644         struct urb *urb;
645         int     done = 0;       /* If we have made any progress */
646
647         IRDA_DEBUG(0, "%s(), Network layer thinks we timed out!\n", __FUNCTION__);
648         IRDA_ASSERT(self != NULL, return;);
649
650         /* Protect us from USB callbacks, net Tx and else. */
651         spin_lock_irqsave(&self->lock, flags);
652
653         /* self->present *MUST* be read under spinlock */
654         if (!self->present) {
655                 IRDA_WARNING("%s(), device not present!\n", __FUNCTION__);
656                 netif_stop_queue(netdev);
657                 spin_unlock_irqrestore(&self->lock, flags);
658                 return;
659         }
660
661         /* Check speed URB */
662         urb = self->speed_urb;
663         if (urb->status != 0) {
664                 IRDA_DEBUG(0, "%s: Speed change timed out, urb->status=%d, urb->transfer_flags=0x%04X\n", netdev->name, urb->status, urb->transfer_flags);
665
666                 switch (urb->status) {
667                 case -EINPROGRESS:
668                         usb_unlink_urb(urb);
669                         /* Note : above will  *NOT* call netif_wake_queue()
670                          * in completion handler, we will come back here.
671                          * Jean II */
672                         done = 1;
673                         break;
674                 case -ECONNRESET:
675                 case -ENOENT:                   /* urb unlinked by us */
676                 default:                        /* ??? - Play safe */
677                         urb->status = 0;
678                         netif_wake_queue(self->netdev);
679                         done = 1;
680                         break;
681                 }
682         }
683
684         /* Check Tx URB */
685         urb = self->tx_urb;
686         if (urb->status != 0) {
687                 struct sk_buff *skb = urb->context;
688
689                 IRDA_DEBUG(0, "%s: Tx timed out, urb->status=%d, urb->transfer_flags=0x%04X\n", netdev->name, urb->status, urb->transfer_flags);
690
691                 /* Increase error count */
692                 self->stats.tx_errors++;
693
694 #ifdef IU_BUG_KICK_TIMEOUT
695                 /* Can't be a bad idea to reset the speed ;-) - Jean II */
696                 if(self->new_speed == -1)
697                         self->new_speed = self->speed;
698                 if(self->new_xbofs == -1)
699                         self->new_xbofs = self->xbofs;
700                 irda_usb_change_speed_xbofs(self);
701 #endif /* IU_BUG_KICK_TIMEOUT */
702
703                 switch (urb->status) {
704                 case -EINPROGRESS:
705                         usb_unlink_urb(urb);
706                         /* Note : above will  *NOT* call netif_wake_queue()
707                          * in completion handler, because urb->status will
708                          * be -ENOENT. We will fix that at the next watchdog,
709                          * leaving more time to USB to recover...
710                          * Jean II */
711                         done = 1;
712                         break;
713                 case -ECONNRESET:
714                 case -ENOENT:                   /* urb unlinked by us */
715                 default:                        /* ??? - Play safe */
716                         if(skb != NULL) {
717                                 dev_kfree_skb_any(skb);
718                                 urb->context = NULL;
719                         }
720                         urb->status = 0;
721                         netif_wake_queue(self->netdev);
722                         done = 1;
723                         break;
724                 }
725         }
726         spin_unlock_irqrestore(&self->lock, flags);
727
728         /* Maybe we need a reset */
729         /* Note : Some drivers seem to use a usb_set_interface() when they
730          * need to reset the hardware. Hum...
731          */
732
733         /* if(done == 0) */
734 }
735
736 /************************* RECEIVE ROUTINES *************************/
737 /*
738  * Receive packets from the USB layer stack and pass them to the IrDA stack.
739  * Try to work around USB failures...
740  */
741
742 /*
743  * Note :
744  * Some of you may have noticed that most dongle have an interrupt in pipe
745  * that we don't use. Here is the little secret...
746  * When we hang a Rx URB on the bulk in pipe, it generates some USB traffic
747  * in every USB frame. This is unnecessary overhead.
748  * The interrupt in pipe will generate an event every time a packet is
749  * received. Reading an interrupt pipe adds minimal overhead, but has some
750  * latency (~1ms).
751  * If we are connected (speed != 9600), we want to minimise latency, so
752  * we just always hang the Rx URB and ignore the interrupt.
753  * If we are not connected (speed == 9600), there is usually no Rx traffic,
754  * and we want to minimise the USB overhead. In this case we should wait
755  * on the interrupt pipe and hang the Rx URB only when an interrupt is
756  * received.
757  * Jean II
758  *
759  * Note : don't read the above as what we are currently doing, but as
760  * something we could do with KC dongle. Also don't forget that the
761  * interrupt pipe is not part of the original standard, so this would
762  * need to be optional...
763  * Jean II
764  */
765
766 /*------------------------------------------------------------------*/
767 /*
768  * Submit a Rx URB to the USB layer to handle reception of a frame
769  * Mostly called by the completion callback of the previous URB.
770  *
771  * Jean II
772  */
773 static void irda_usb_submit(struct irda_usb_cb *self, struct sk_buff *skb, struct urb *urb)
774 {
775         struct irda_skb_cb *cb;
776         int ret;
777
778         IRDA_DEBUG(2, "%s()\n", __FUNCTION__);
779
780         /* This should never happen */
781         IRDA_ASSERT(skb != NULL, return;);
782         IRDA_ASSERT(urb != NULL, return;);
783
784         /* Save ourselves in the skb */
785         cb = (struct irda_skb_cb *) skb->cb;
786         cb->context = self;
787
788         /* Reinitialize URB */
789         usb_fill_bulk_urb(urb, self->usbdev, 
790                       usb_rcvbulkpipe(self->usbdev, self->bulk_in_ep), 
791                       skb->data, IRDA_SKB_MAX_MTU,
792                       irda_usb_receive, skb);
793         urb->status = 0;
794
795         /* Can be called from irda_usb_receive (irq handler) -> GFP_ATOMIC */
796         ret = usb_submit_urb(urb, GFP_ATOMIC);
797         if (ret) {
798                 /* If this ever happen, we are in deep s***.
799                  * Basically, the Rx path will stop... */
800                 IRDA_WARNING("%s(), Failed to submit Rx URB %d\n",
801                              __FUNCTION__, ret);
802         }
803 }
804
805 /*------------------------------------------------------------------*/
806 /*
807  * Function irda_usb_receive(urb)
808  *
809  *     Called by the USB subsystem when a frame has been received
810  *
811  */
812 static void irda_usb_receive(struct urb *urb)
813 {
814         struct sk_buff *skb = (struct sk_buff *) urb->context;
815         struct irda_usb_cb *self; 
816         struct irda_skb_cb *cb;
817         struct sk_buff *newskb;
818         struct sk_buff *dataskb;
819         struct urb *next_urb;
820         unsigned int len, docopy;
821
822         IRDA_DEBUG(2, "%s(), len=%d\n", __FUNCTION__, urb->actual_length);
823         
824         /* Find ourselves */
825         cb = (struct irda_skb_cb *) skb->cb;
826         IRDA_ASSERT(cb != NULL, return;);
827         self = (struct irda_usb_cb *) cb->context;
828         IRDA_ASSERT(self != NULL, return;);
829
830         /* If the network is closed or the device gone, stop everything */
831         if ((!self->netopen) || (!self->present)) {
832                 IRDA_DEBUG(0, "%s(), Network is gone!\n", __FUNCTION__);
833                 /* Don't re-submit the URB : will stall the Rx path */
834                 return;
835         }
836         
837         /* Check the status */
838         if (urb->status != 0) {
839                 switch (urb->status) {
840                 case -EILSEQ:
841                         self->stats.rx_crc_errors++;    
842                         /* Also precursor to a hot-unplug on UHCI. */
843                         /* Fallthrough... */
844                 case -ECONNRESET:
845                         /* Random error, if I remember correctly */
846                         /* uhci_cleanup_unlink() is going to kill the Rx
847                          * URB just after we return. No problem, at this
848                          * point the URB will be idle ;-) - Jean II */
849                 case -ESHUTDOWN:
850                         /* That's usually a hot-unplug. Submit will fail... */
851                 case -ETIME:
852                         /* Usually precursor to a hot-unplug on OHCI. */
853                 default:
854                         self->stats.rx_errors++;
855                         IRDA_DEBUG(0, "%s(), RX status %d, transfer_flags 0x%04X \n", __FUNCTION__, urb->status, urb->transfer_flags);
856                         break;
857                 }
858                 /* If we received an error, we don't want to resubmit the
859                  * Rx URB straight away but to give the USB layer a little
860                  * bit of breathing room.
861                  * We are in the USB thread context, therefore there is a
862                  * danger of recursion (new URB we submit fails, we come
863                  * back here).
864                  * With recent USB stack (2.6.15+), I'm seeing that on
865                  * hot unplug of the dongle...
866                  * Lowest effective timer is 10ms...
867                  * Jean II */
868                 self->rx_defer_timer.function = &irda_usb_rx_defer_expired;
869                 self->rx_defer_timer.data = (unsigned long) urb;
870                 mod_timer(&self->rx_defer_timer, jiffies + (10 * HZ / 1000));
871                 return;
872         }
873         
874         /* Check for empty frames */
875         if (urb->actual_length <= self->header_length) {
876                 IRDA_WARNING("%s(), empty frame!\n", __FUNCTION__);
877                 goto done;
878         }
879
880         /*  
881          * Remember the time we received this frame, so we can
882          * reduce the min turn time a bit since we will know
883          * how much time we have used for protocol processing
884          */
885         do_gettimeofday(&self->stamp);
886
887         /* Check if we need to copy the data to a new skb or not.
888          * For most frames, we use ZeroCopy and pass the already
889          * allocated skb up the stack.
890          * If the frame is small, it is more efficient to copy it
891          * to save memory (copy will be fast anyway - that's
892          * called Rx-copy-break). Jean II */
893         docopy = (urb->actual_length < IRDA_RX_COPY_THRESHOLD);
894
895         /* Allocate a new skb */
896         if (self->capability & IUC_STIR421X)
897                 newskb = dev_alloc_skb(docopy ? urb->actual_length :
898                                        IRDA_SKB_MAX_MTU +
899                                        USB_IRDA_STIR421X_HEADER);
900         else
901                 newskb = dev_alloc_skb(docopy ? urb->actual_length :
902                                        IRDA_SKB_MAX_MTU);
903
904         if (!newskb)  {
905                 self->stats.rx_dropped++;
906                 /* We could deliver the current skb, but this would stall
907                  * the Rx path. Better drop the packet... Jean II */
908                 goto done;  
909         }
910
911         /* Make sure IP header get aligned (IrDA header is 5 bytes) */
912         /* But IrDA-USB header is 1 byte. Jean II */
913         //skb_reserve(newskb, USB_IRDA_HEADER - 1);
914
915         if(docopy) {
916                 /* Copy packet, so we can recycle the original */
917                 memcpy(newskb->data, skb->data, urb->actual_length);
918                 /* Deliver this new skb */
919                 dataskb = newskb;
920                 /* And hook the old skb to the URB
921                  * Note : we don't need to "clean up" the old skb,
922                  * as we never touched it. Jean II */
923         } else {
924                 /* We are using ZeroCopy. Deliver old skb */
925                 dataskb = skb;
926                 /* And hook the new skb to the URB */
927                 skb = newskb;
928         }
929
930         /* Set proper length on skb & remove USB-IrDA header */
931         skb_put(dataskb, urb->actual_length);
932         skb_pull(dataskb, self->header_length);
933
934         /* Ask the networking layer to queue the packet for the IrDA stack */
935         dataskb->dev = self->netdev;
936         dataskb->mac.raw  = dataskb->data;
937         dataskb->protocol = htons(ETH_P_IRDA);
938         len = dataskb->len;
939         netif_rx(dataskb);
940
941         /* Keep stats up to date */
942         self->stats.rx_bytes += len;
943         self->stats.rx_packets++;
944         self->netdev->last_rx = jiffies;
945
946 done:
947         /* Note : at this point, the URB we've just received (urb)
948          * is still referenced by the USB layer. For example, if we
949          * have received a -ECONNRESET, uhci_cleanup_unlink() will
950          * continue to process it (in fact, cleaning it up).
951          * If we were to submit this URB, disaster would ensue.
952          * Therefore, we submit our idle URB, and put this URB in our
953          * idle slot....
954          * Jean II */
955         /* Note : with this scheme, we could submit the idle URB before
956          * processing the Rx URB. I don't think it would buy us anything as
957          * we are running in the USB thread context. Jean II */
958         next_urb = self->idle_rx_urb;
959
960         /* Recycle Rx URB : Now, the idle URB is the present one */
961         urb->context = NULL;
962         self->idle_rx_urb = urb;
963
964         /* Submit the idle URB to replace the URB we've just received.
965          * Do it last to avoid race conditions... Jean II */
966         irda_usb_submit(self, skb, next_urb);
967 }
968
969 /*------------------------------------------------------------------*/
970 /*
971  * In case of errors, we want the USB layer to have time to recover.
972  * Now, it is time to resubmit ouur Rx URB...
973  */
974 static void irda_usb_rx_defer_expired(unsigned long data)
975 {
976         struct urb *urb = (struct urb *) data;
977         struct sk_buff *skb = (struct sk_buff *) urb->context;
978         struct irda_usb_cb *self; 
979         struct irda_skb_cb *cb;
980         struct urb *next_urb;
981
982         IRDA_DEBUG(2, "%s()\n", __FUNCTION__);
983
984         /* Find ourselves */
985         cb = (struct irda_skb_cb *) skb->cb;
986         IRDA_ASSERT(cb != NULL, return;);
987         self = (struct irda_usb_cb *) cb->context;
988         IRDA_ASSERT(self != NULL, return;);
989
990         /* Same stuff as when Rx is done, see above... */
991         next_urb = self->idle_rx_urb;
992         urb->context = NULL;
993         self->idle_rx_urb = urb;
994         irda_usb_submit(self, skb, next_urb);
995 }
996
997 /*------------------------------------------------------------------*/
998 /*
999  * Callbak from IrDA layer. IrDA wants to know if we have
1000  * started receiving anything.
1001  */
1002 static int irda_usb_is_receiving(struct irda_usb_cb *self)
1003 {
1004         /* Note : because of the way UHCI works, it's almost impossible
1005          * to get this info. The Controller DMA directly to memory and
1006          * signal only when the whole frame is finished. To know if the
1007          * first TD of the URB has been filled or not seems hard work...
1008          *
1009          * The other solution would be to use the "receiving" command
1010          * on the default decriptor with a usb_control_msg(), but that
1011          * would add USB traffic and would return result only in the
1012          * next USB frame (~1ms).
1013          *
1014          * I've been told that current dongles send status info on their
1015          * interrupt endpoint, and that's what the Windows driver uses
1016          * to know this info. Unfortunately, this is not yet in the spec...
1017          *
1018          * Jean II
1019          */
1020
1021         return 0; /* For now */
1022 }
1023
1024 #define STIR421X_PATCH_PRODUCT_VER     "Product Version: "
1025 #define STIR421X_PATCH_STMP_TAG        "STMP"
1026 #define STIR421X_PATCH_CODE_OFFSET     512 /* patch image starts before here */
1027 /* marks end of patch file header (PC DOS text file EOF character) */
1028 #define STIR421X_PATCH_END_OF_HDR_TAG  0x1A
1029 #define STIR421X_PATCH_BLOCK_SIZE      1023
1030
1031 /*
1032  * Function stir421x_fwupload (struct irda_usb_cb *self,
1033  *                             unsigned char *patch,
1034  *                             const unsigned int patch_len)
1035  *
1036  *   Upload firmware code to SigmaTel 421X IRDA-USB dongle
1037  */
1038 static int stir421x_fw_upload(struct irda_usb_cb *self,
1039                              unsigned char *patch,
1040                              const unsigned int patch_len)
1041 {
1042         int ret = -ENOMEM;
1043         int actual_len = 0;
1044         unsigned int i;
1045         unsigned int block_size = 0;
1046         unsigned char *patch_block;
1047
1048         patch_block = kzalloc(STIR421X_PATCH_BLOCK_SIZE, GFP_KERNEL);
1049         if (patch_block == NULL)
1050                 return -ENOMEM;
1051
1052         /* break up patch into 1023-byte sections */
1053         for (i = 0; i < patch_len; i += block_size) {
1054                 block_size = patch_len - i;
1055
1056                 if (block_size > STIR421X_PATCH_BLOCK_SIZE)
1057                         block_size = STIR421X_PATCH_BLOCK_SIZE;
1058
1059                 /* upload the patch section */
1060                 memcpy(patch_block, patch + i, block_size);
1061
1062                 ret = usb_bulk_msg(self->usbdev,
1063                                    usb_sndbulkpipe(self->usbdev,
1064                                                    self->bulk_out_ep),
1065                                    patch_block, block_size,
1066                                    &actual_len, msecs_to_jiffies(500));
1067                 IRDA_DEBUG(3,"%s(): Bulk send %u bytes, ret=%d\n",
1068                            __FUNCTION__, actual_len, ret);
1069
1070                 if (ret < 0)
1071                         break;
1072         }
1073
1074         kfree(patch_block);
1075
1076         return ret;
1077  }
1078
1079 /*
1080  * Function stir421x_patch_device(struct irda_usb_cb *self)
1081  *
1082  * Get a firmware code from userspase using hotplug request_firmware() call
1083   */
1084 static int stir421x_patch_device(struct irda_usb_cb *self)
1085 {
1086         unsigned int i;
1087         int ret;
1088         char stir421x_fw_name[11];
1089         const struct firmware *fw;
1090         unsigned char *fw_version_ptr; /* pointer to version string */
1091         unsigned long fw_version = 0;
1092
1093         /*
1094          * Known firmware patch file names for STIR421x dongles
1095          * are "42101001.sb" or "42101002.sb"
1096          */
1097         sprintf(stir421x_fw_name, "4210%4X.sb",
1098                 self->usbdev->descriptor.bcdDevice);
1099         ret = request_firmware(&fw, stir421x_fw_name, &self->usbdev->dev);
1100         if (ret < 0)
1101                 return ret;
1102
1103         /* We get a patch from userspace */
1104         IRDA_MESSAGE("%s(): Received firmware %s (%zu bytes)\n",
1105                      __FUNCTION__, stir421x_fw_name, fw->size);
1106
1107         ret = -EINVAL;
1108
1109         /* Get the bcd product version */
1110         if (!memcmp(fw->data, STIR421X_PATCH_PRODUCT_VER,
1111                     sizeof(STIR421X_PATCH_PRODUCT_VER) - 1)) {
1112                 fw_version_ptr = fw->data +
1113                         sizeof(STIR421X_PATCH_PRODUCT_VER) - 1;
1114
1115                 /* Let's check if the product version is dotted */
1116                 if (fw_version_ptr[3] == '.' &&
1117                     fw_version_ptr[7] == '.') {
1118                         unsigned long major, minor, build;
1119                         major = simple_strtoul(fw_version_ptr, NULL, 10);
1120                         minor = simple_strtoul(fw_version_ptr + 4, NULL, 10);
1121                         build = simple_strtoul(fw_version_ptr + 8, NULL, 10);
1122
1123                         fw_version = (major << 12)
1124                                 + (minor << 8)
1125                                 + ((build / 10) << 4)
1126                                 + (build % 10);
1127
1128                         IRDA_DEBUG(3, "%s(): Firmware Product version %ld\n",
1129                                    __FUNCTION__, fw_version);
1130                 }
1131         }
1132
1133         if (self->usbdev->descriptor.bcdDevice == fw_version) {
1134                 /*
1135                  * If we're here, we've found a correct patch
1136                  * The actual image starts after the "STMP" keyword
1137                  * so forward to the firmware header tag
1138                  */
1139                 for (i = 0; (fw->data[i] != STIR421X_PATCH_END_OF_HDR_TAG)
1140                              && (i < fw->size); i++) ;
1141                 /* here we check for the out of buffer case */
1142                 if ((STIR421X_PATCH_END_OF_HDR_TAG == fw->data[i])
1143                     && (i < STIR421X_PATCH_CODE_OFFSET)) {
1144                         if (!memcmp(fw->data + i + 1, STIR421X_PATCH_STMP_TAG,
1145                                     sizeof(STIR421X_PATCH_STMP_TAG) - 1)) {
1146
1147                                 /* We can upload the patch to the target */
1148                                 i += sizeof(STIR421X_PATCH_STMP_TAG);
1149                                 ret = stir421x_fw_upload(self, &fw->data[i],
1150                                                          fw->size - i);
1151                         }
1152                 }
1153         }
1154
1155         release_firmware(fw);
1156
1157         return ret;
1158 }
1159
1160
1161 /********************** IRDA DEVICE CALLBACKS **********************/
1162 /*
1163  * Main calls from the IrDA/Network subsystem.
1164  * Mostly registering a new irda-usb device and removing it....
1165  * We only deal with the IrDA side of the business, the USB side will
1166  * be dealt with below...
1167  */
1168
1169
1170 /*------------------------------------------------------------------*/
1171 /*
1172  * Function irda_usb_net_open (dev)
1173  *
1174  *    Network device is taken up. Usually this is done by "ifconfig irda0 up" 
1175  *   
1176  * Note : don't mess with self->netopen - Jean II
1177  */
1178 static int irda_usb_net_open(struct net_device *netdev)
1179 {
1180         struct irda_usb_cb *self;
1181         char    hwname[16];
1182         int i;
1183         
1184         IRDA_DEBUG(1, "%s()\n", __FUNCTION__);
1185
1186         IRDA_ASSERT(netdev != NULL, return -1;);
1187         self = (struct irda_usb_cb *) netdev->priv;
1188         IRDA_ASSERT(self != NULL, return -1;);
1189
1190         /* Can only open the device if it's there */
1191         if(!self->present) {
1192                 IRDA_WARNING("%s(), device not present!\n", __FUNCTION__);
1193                 return -1;
1194         }
1195
1196         if(self->needspatch) {
1197                 IRDA_WARNING("%s(), device needs patch\n", __FUNCTION__) ;
1198                 return -EIO ;
1199         }
1200
1201         /* Initialise default speed and xbofs value
1202          * (IrLAP will change that soon) */
1203         self->speed = -1;
1204         self->xbofs = -1;
1205         self->new_speed = -1;
1206         self->new_xbofs = -1;
1207
1208         /* To do *before* submitting Rx urbs and starting net Tx queue
1209          * Jean II */
1210         self->netopen = 1;
1211
1212         /* 
1213          * Now that everything should be initialized properly,
1214          * Open new IrLAP layer instance to take care of us...
1215          * Note : will send immediately a speed change...
1216          */
1217         sprintf(hwname, "usb#%d", self->usbdev->devnum);
1218         self->irlap = irlap_open(netdev, &self->qos, hwname);
1219         IRDA_ASSERT(self->irlap != NULL, return -1;);
1220
1221         /* Allow IrLAP to send data to us */
1222         netif_start_queue(netdev);
1223
1224         /* We submit all the Rx URB except for one that we keep idle.
1225          * Need to be initialised before submitting other USBs, because
1226          * in some cases as soon as we submit the URBs the USB layer
1227          * will trigger a dummy receive - Jean II */
1228         self->idle_rx_urb = self->rx_urb[IU_MAX_ACTIVE_RX_URBS];
1229         self->idle_rx_urb->context = NULL;
1230
1231         /* Now that we can pass data to IrLAP, allow the USB layer
1232          * to send us some data... */
1233         for (i = 0; i < IU_MAX_ACTIVE_RX_URBS; i++) {
1234                 struct sk_buff *skb = dev_alloc_skb(IRDA_SKB_MAX_MTU);
1235                 if (!skb) {
1236                         /* If this ever happen, we are in deep s***.
1237                          * Basically, we can't start the Rx path... */
1238                         IRDA_WARNING("%s(), Failed to allocate Rx skb\n",
1239                                      __FUNCTION__);
1240                         return -1;
1241                 }
1242                 //skb_reserve(newskb, USB_IRDA_HEADER - 1);
1243                 irda_usb_submit(self, skb, self->rx_urb[i]);
1244         }
1245
1246         /* Ready to play !!! */
1247         return 0;
1248 }
1249
1250 /*------------------------------------------------------------------*/
1251 /*
1252  * Function irda_usb_net_close (self)
1253  *
1254  *    Network device is taken down. Usually this is done by 
1255  *    "ifconfig irda0 down" 
1256  */
1257 static int irda_usb_net_close(struct net_device *netdev)
1258 {
1259         struct irda_usb_cb *self;
1260         int     i;
1261
1262         IRDA_DEBUG(1, "%s()\n", __FUNCTION__);
1263
1264         IRDA_ASSERT(netdev != NULL, return -1;);
1265         self = (struct irda_usb_cb *) netdev->priv;
1266         IRDA_ASSERT(self != NULL, return -1;);
1267
1268         /* Clear this flag *before* unlinking the urbs and *before*
1269          * stopping the network Tx queue - Jean II */
1270         self->netopen = 0;
1271
1272         /* Stop network Tx queue */
1273         netif_stop_queue(netdev);
1274
1275         /* Kill defered Rx URB */
1276         del_timer(&self->rx_defer_timer);
1277
1278         /* Deallocate all the Rx path buffers (URBs and skb) */
1279         for (i = 0; i < self->max_rx_urb; i++) {
1280                 struct urb *urb = self->rx_urb[i];
1281                 struct sk_buff *skb = (struct sk_buff *) urb->context;
1282                 /* Cancel the receive command */
1283                 usb_kill_urb(urb);
1284                 /* The skb is ours, free it */
1285                 if(skb) {
1286                         dev_kfree_skb(skb);
1287                         urb->context = NULL;
1288                 }
1289         }
1290         /* Cancel Tx and speed URB - need to be synchronous to avoid races */
1291         usb_kill_urb(self->tx_urb);
1292         usb_kill_urb(self->speed_urb);
1293
1294         /* Stop and remove instance of IrLAP */
1295         if (self->irlap)
1296                 irlap_close(self->irlap);
1297         self->irlap = NULL;
1298
1299         return 0;
1300 }
1301
1302 /*------------------------------------------------------------------*/
1303 /*
1304  * IOCTLs : Extra out-of-band network commands...
1305  */
1306 static int irda_usb_net_ioctl(struct net_device *dev, struct ifreq *rq, int cmd)
1307 {
1308         unsigned long flags;
1309         struct if_irda_req *irq = (struct if_irda_req *) rq;
1310         struct irda_usb_cb *self;
1311         int ret = 0;
1312
1313         IRDA_ASSERT(dev != NULL, return -1;);
1314         self = dev->priv;
1315         IRDA_ASSERT(self != NULL, return -1;);
1316
1317         IRDA_DEBUG(2, "%s(), %s, (cmd=0x%X)\n", __FUNCTION__, dev->name, cmd);
1318
1319         switch (cmd) {
1320         case SIOCSBANDWIDTH: /* Set bandwidth */
1321                 if (!capable(CAP_NET_ADMIN))
1322                         return -EPERM;
1323                 /* Protect us from USB callbacks, net watchdog and else. */
1324                 spin_lock_irqsave(&self->lock, flags);
1325                 /* Check if the device is still there */
1326                 if(self->present) {
1327                         /* Set the desired speed */
1328                         self->new_speed = irq->ifr_baudrate;
1329                         irda_usb_change_speed_xbofs(self);
1330                 }
1331                 spin_unlock_irqrestore(&self->lock, flags);
1332                 break;
1333         case SIOCSMEDIABUSY: /* Set media busy */
1334                 if (!capable(CAP_NET_ADMIN))
1335                         return -EPERM;
1336                 /* Check if the IrDA stack is still there */
1337                 if(self->netopen)
1338                         irda_device_set_media_busy(self->netdev, TRUE);
1339                 break;
1340         case SIOCGRECEIVING: /* Check if we are receiving right now */
1341                 irq->ifr_receiving = irda_usb_is_receiving(self);
1342                 break;
1343         default:
1344                 ret = -EOPNOTSUPP;
1345         }
1346         
1347         return ret;
1348 }
1349
1350 /*------------------------------------------------------------------*/
1351 /*
1352  * Get device stats (for /proc/net/dev and ifconfig)
1353  */
1354 static struct net_device_stats *irda_usb_net_get_stats(struct net_device *dev)
1355 {
1356         struct irda_usb_cb *self = dev->priv;
1357         return &self->stats;
1358 }
1359
1360 /********************* IRDA CONFIG SUBROUTINES *********************/
1361 /*
1362  * Various subroutines dealing with IrDA and network stuff we use to
1363  * configure and initialise each irda-usb instance.
1364  * These functions are used below in the main calls of the driver...
1365  */
1366
1367 /*------------------------------------------------------------------*/
1368 /*
1369  * Set proper values in the IrDA QOS structure
1370  */
1371 static inline void irda_usb_init_qos(struct irda_usb_cb *self)
1372 {
1373         struct irda_class_desc *desc;
1374
1375         IRDA_DEBUG(3, "%s()\n", __FUNCTION__);
1376         
1377         desc = self->irda_desc;
1378         
1379         /* Initialize QoS for this device */
1380         irda_init_max_qos_capabilies(&self->qos);
1381
1382         /* See spec section 7.2 for meaning.
1383          * Values are little endian (as most USB stuff), the IrDA stack
1384          * use it in native order (see parameters.c). - Jean II */
1385         self->qos.baud_rate.bits       = le16_to_cpu(desc->wBaudRate);
1386         self->qos.min_turn_time.bits   = desc->bmMinTurnaroundTime;
1387         self->qos.additional_bofs.bits = desc->bmAdditionalBOFs;
1388         self->qos.window_size.bits     = desc->bmWindowSize;
1389         self->qos.data_size.bits       = desc->bmDataSize;
1390
1391         IRDA_DEBUG(0, "%s(), dongle says speed=0x%X, size=0x%X, window=0x%X, bofs=0x%X, turn=0x%X\n", 
1392                 __FUNCTION__, self->qos.baud_rate.bits, self->qos.data_size.bits, self->qos.window_size.bits, self->qos.additional_bofs.bits, self->qos.min_turn_time.bits);
1393
1394         /* Don't always trust what the dongle tell us */
1395         if(self->capability & IUC_SIR_ONLY)
1396                 self->qos.baud_rate.bits        &= 0x00ff;
1397         if(self->capability & IUC_SMALL_PKT)
1398                 self->qos.data_size.bits         = 0x07;
1399         if(self->capability & IUC_NO_WINDOW)
1400                 self->qos.window_size.bits       = 0x01;
1401         if(self->capability & IUC_MAX_WINDOW)
1402                 self->qos.window_size.bits       = 0x7f;
1403         if(self->capability & IUC_MAX_XBOFS)
1404                 self->qos.additional_bofs.bits   = 0x01;
1405
1406 #if 1
1407         /* Module parameter can override the rx window size */
1408         if (qos_mtt_bits)
1409                 self->qos.min_turn_time.bits = qos_mtt_bits;
1410 #endif      
1411         /* 
1412          * Note : most of those values apply only for the receive path,
1413          * the transmit path will be set differently - Jean II 
1414          */
1415         irda_qos_bits_to_value(&self->qos);
1416 }
1417
1418 /*------------------------------------------------------------------*/
1419 /*
1420  * Initialise the network side of the irda-usb instance
1421  * Called when a new USB instance is registered in irda_usb_probe()
1422  */
1423 static inline int irda_usb_open(struct irda_usb_cb *self)
1424 {
1425         struct net_device *netdev = self->netdev;
1426
1427         IRDA_DEBUG(1, "%s()\n", __FUNCTION__);
1428
1429         irda_usb_init_qos(self);
1430
1431         /* Override the network functions we need to use */
1432         netdev->hard_start_xmit = irda_usb_hard_xmit;
1433         netdev->tx_timeout      = irda_usb_net_timeout;
1434         netdev->watchdog_timeo  = 250*HZ/1000;  /* 250 ms > USB timeout */
1435         netdev->open            = irda_usb_net_open;
1436         netdev->stop            = irda_usb_net_close;
1437         netdev->get_stats       = irda_usb_net_get_stats;
1438         netdev->do_ioctl        = irda_usb_net_ioctl;
1439
1440         return register_netdev(netdev);
1441 }
1442
1443 /*------------------------------------------------------------------*/
1444 /*
1445  * Cleanup the network side of the irda-usb instance
1446  * Called when a USB instance is removed in irda_usb_disconnect()
1447  */
1448 static inline void irda_usb_close(struct irda_usb_cb *self)
1449 {
1450         IRDA_DEBUG(1, "%s()\n", __FUNCTION__);
1451
1452         /* Remove netdevice */
1453         unregister_netdev(self->netdev);
1454
1455         /* Remove the speed buffer */
1456         kfree(self->speed_buff);
1457         self->speed_buff = NULL;
1458 }
1459
1460 /********************** USB CONFIG SUBROUTINES **********************/
1461 /*
1462  * Various subroutines dealing with USB stuff we use to configure and
1463  * initialise each irda-usb instance.
1464  * These functions are used below in the main calls of the driver...
1465  */
1466
1467 /*------------------------------------------------------------------*/
1468 /*
1469  * Function irda_usb_parse_endpoints(dev, ifnum)
1470  *
1471  *    Parse the various endpoints and find the one we need.
1472  *
1473  * The endpoint are the pipes used to communicate with the USB device.
1474  * The spec defines 2 endpoints of type bulk transfer, one in, and one out.
1475  * These are used to pass frames back and forth with the dongle.
1476  * Most dongle have also an interrupt endpoint, that will be probably
1477  * documented in the next spec...
1478  */
1479 static inline int irda_usb_parse_endpoints(struct irda_usb_cb *self, struct usb_host_endpoint *endpoint, int ennum)
1480 {
1481         int i;          /* Endpoint index in table */
1482                 
1483         /* Init : no endpoints */
1484         self->bulk_in_ep = 0;
1485         self->bulk_out_ep = 0;
1486         self->bulk_int_ep = 0;
1487
1488         /* Let's look at all those endpoints */
1489         for(i = 0; i < ennum; i++) {
1490                 /* All those variables will get optimised by the compiler,
1491                  * so let's aim for clarity... - Jean II */
1492                 __u8 ep;        /* Endpoint address */
1493                 __u8 dir;       /* Endpoint direction */
1494                 __u8 attr;      /* Endpoint attribute */
1495                 __u16 psize;    /* Endpoint max packet size in bytes */
1496
1497                 /* Get endpoint address, direction and attribute */
1498                 ep = endpoint[i].desc.bEndpointAddress & USB_ENDPOINT_NUMBER_MASK;
1499                 dir = endpoint[i].desc.bEndpointAddress & USB_ENDPOINT_DIR_MASK;
1500                 attr = endpoint[i].desc.bmAttributes;
1501                 psize = le16_to_cpu(endpoint[i].desc.wMaxPacketSize);
1502
1503                 /* Is it a bulk endpoint ??? */
1504                 if(attr == USB_ENDPOINT_XFER_BULK) {
1505                         /* We need to find an IN and an OUT */
1506                         if(dir == USB_DIR_IN) {
1507                                 /* This is our Rx endpoint */
1508                                 self->bulk_in_ep = ep;
1509                         } else {
1510                                 /* This is our Tx endpoint */
1511                                 self->bulk_out_ep = ep;
1512                                 self->bulk_out_mtu = psize;
1513                         }
1514                 } else {
1515                         if((attr == USB_ENDPOINT_XFER_INT) &&
1516                            (dir == USB_DIR_IN)) {
1517                                 /* This is our interrupt endpoint */
1518                                 self->bulk_int_ep = ep;
1519                         } else {
1520                                 IRDA_ERROR("%s(), Unrecognised endpoint %02X.\n", __FUNCTION__, ep);
1521                         }
1522                 }
1523         }
1524
1525         IRDA_DEBUG(0, "%s(), And our endpoints are : in=%02X, out=%02X (%d), int=%02X\n",
1526                 __FUNCTION__, self->bulk_in_ep, self->bulk_out_ep, self->bulk_out_mtu, self->bulk_int_ep);
1527         /* Should be 8, 16, 32 or 64 bytes */
1528         IRDA_ASSERT(self->bulk_out_mtu == 64, ;);
1529
1530         return((self->bulk_in_ep != 0) && (self->bulk_out_ep != 0));
1531 }
1532
1533 #ifdef IU_DUMP_CLASS_DESC
1534 /*------------------------------------------------------------------*/
1535 /*
1536  * Function usb_irda_dump_class_desc(desc)
1537  *
1538  *    Prints out the contents of the IrDA class descriptor
1539  *
1540  */
1541 static inline void irda_usb_dump_class_desc(struct irda_class_desc *desc)
1542 {
1543         /* Values are little endian */
1544         printk("bLength=%x\n", desc->bLength);
1545         printk("bDescriptorType=%x\n", desc->bDescriptorType);
1546         printk("bcdSpecRevision=%x\n", le16_to_cpu(desc->bcdSpecRevision)); 
1547         printk("bmDataSize=%x\n", desc->bmDataSize);
1548         printk("bmWindowSize=%x\n", desc->bmWindowSize);
1549         printk("bmMinTurnaroundTime=%d\n", desc->bmMinTurnaroundTime);
1550         printk("wBaudRate=%x\n", le16_to_cpu(desc->wBaudRate));
1551         printk("bmAdditionalBOFs=%x\n", desc->bmAdditionalBOFs);
1552         printk("bIrdaRateSniff=%x\n", desc->bIrdaRateSniff);
1553         printk("bMaxUnicastList=%x\n", desc->bMaxUnicastList);
1554 }
1555 #endif /* IU_DUMP_CLASS_DESC */
1556
1557 /*------------------------------------------------------------------*/
1558 /*
1559  * Function irda_usb_find_class_desc(intf)
1560  *
1561  *    Returns instance of IrDA class descriptor, or NULL if not found
1562  *
1563  * The class descriptor is some extra info that IrDA USB devices will
1564  * offer to us, describing their IrDA characteristics. We will use that in
1565  * irda_usb_init_qos()
1566  */
1567 static inline struct irda_class_desc *irda_usb_find_class_desc(struct usb_interface *intf)
1568 {
1569         struct usb_device *dev = interface_to_usbdev (intf);
1570         struct irda_class_desc *desc;
1571         int ret;
1572
1573         desc = kmalloc(sizeof (*desc), GFP_KERNEL);
1574         if (desc == NULL) 
1575                 return NULL;
1576         memset(desc, 0, sizeof(*desc));
1577
1578         /* USB-IrDA class spec 1.0:
1579          *      6.1.3: Standard "Get Descriptor" Device Request is not
1580          *             appropriate to retrieve class-specific descriptor
1581          *      6.2.5: Class Specific "Get Class Descriptor" Interface Request
1582          *             is mandatory and returns the USB-IrDA class descriptor
1583          */
1584
1585         ret = usb_control_msg(dev, usb_rcvctrlpipe(dev,0),
1586                 IU_REQ_GET_CLASS_DESC,
1587                 USB_DIR_IN | USB_TYPE_CLASS | USB_RECIP_INTERFACE,
1588                 0, intf->altsetting->desc.bInterfaceNumber, desc,
1589                 sizeof(*desc), 500);
1590         
1591         IRDA_DEBUG(1, "%s(), ret=%d\n", __FUNCTION__, ret);
1592         if (ret < sizeof(*desc)) {
1593                 IRDA_WARNING("usb-irda: class_descriptor read %s (%d)\n",
1594                              (ret<0) ? "failed" : "too short", ret);
1595         }
1596         else if (desc->bDescriptorType != USB_DT_IRDA) {
1597                 IRDA_WARNING("usb-irda: bad class_descriptor type\n");
1598         }
1599         else {
1600 #ifdef IU_DUMP_CLASS_DESC
1601                 irda_usb_dump_class_desc(desc);
1602 #endif  /* IU_DUMP_CLASS_DESC */
1603
1604                 return desc;
1605         }
1606         kfree(desc);
1607         return NULL;
1608 }
1609
1610 /*********************** USB DEVICE CALLBACKS ***********************/
1611 /*
1612  * Main calls from the USB subsystem.
1613  * Mostly registering a new irda-usb device and removing it....
1614  */
1615
1616 /*------------------------------------------------------------------*/
1617 /*
1618  * This routine is called by the USB subsystem for each new device
1619  * in the system. We need to check if the device is ours, and in
1620  * this case start handling it.
1621  * The USB layer protect us from reentrancy (via BKL), so we don't need
1622  * to spinlock in there... Jean II
1623  */
1624 static int irda_usb_probe(struct usb_interface *intf,
1625                           const struct usb_device_id *id)
1626 {
1627         struct net_device *net;
1628         struct usb_device *dev = interface_to_usbdev(intf);
1629         struct irda_usb_cb *self = NULL;
1630         struct usb_host_interface *interface;
1631         struct irda_class_desc *irda_desc;
1632         int ret = -ENOMEM;
1633         int i;          /* Driver instance index / Rx URB index */
1634
1635         /* Note : the probe make sure to call us only for devices that
1636          * matches the list of dongle (top of the file). So, we
1637          * don't need to check if the dongle is really ours.
1638          * Jean II */
1639
1640         IRDA_MESSAGE("IRDA-USB found at address %d, Vendor: %x, Product: %x\n",
1641                      dev->devnum, le16_to_cpu(dev->descriptor.idVendor),
1642                      le16_to_cpu(dev->descriptor.idProduct));
1643
1644         net = alloc_irdadev(sizeof(*self));
1645         if (!net) 
1646                 goto err_out;
1647
1648         SET_MODULE_OWNER(net);
1649         SET_NETDEV_DEV(net, &intf->dev);
1650         self = net->priv;
1651         self->netdev = net;
1652         spin_lock_init(&self->lock);
1653         init_timer(&self->rx_defer_timer);
1654
1655         self->capability = id->driver_info;
1656         self->needspatch = ((self->capability & IUC_STIR421X) != 0);
1657
1658         /* Create all of the needed urbs */
1659         if (self->capability & IUC_STIR421X) {
1660                 self->max_rx_urb = IU_SIGMATEL_MAX_RX_URBS;
1661                 self->header_length = USB_IRDA_STIR421X_HEADER;
1662         } else {
1663                 self->max_rx_urb = IU_MAX_RX_URBS;
1664                 self->header_length = USB_IRDA_HEADER;
1665         }
1666
1667         self->rx_urb = kzalloc(self->max_rx_urb * sizeof(struct urb *),
1668                                 GFP_KERNEL);
1669
1670         for (i = 0; i < self->max_rx_urb; i++) {
1671                 self->rx_urb[i] = usb_alloc_urb(0, GFP_KERNEL);
1672                 if (!self->rx_urb[i]) {
1673                         goto err_out_1;
1674                 }
1675         }
1676         self->tx_urb = usb_alloc_urb(0, GFP_KERNEL);
1677         if (!self->tx_urb) {
1678                 goto err_out_1;
1679         }
1680         self->speed_urb = usb_alloc_urb(0, GFP_KERNEL);
1681         if (!self->speed_urb) {
1682                 goto err_out_2;
1683         }
1684
1685         /* Is this really necessary? (no, except maybe for broken devices) */
1686         if (usb_reset_configuration (dev) < 0) {
1687                 err("reset_configuration failed");
1688                 ret = -EIO;
1689                 goto err_out_3;
1690         }
1691
1692         /* Is this really necessary? */
1693         /* Note : some driver do hardcode the interface number, some others
1694          * specify an alternate, but very few driver do like this.
1695          * Jean II */
1696         ret = usb_set_interface(dev, intf->altsetting->desc.bInterfaceNumber, 0);
1697         IRDA_DEBUG(1, "usb-irda: set interface %d result %d\n", intf->altsetting->desc.bInterfaceNumber, ret);
1698         switch (ret) {
1699                 case 0:
1700                         break;
1701                 case -EPIPE:            /* -EPIPE = -32 */
1702                         /* Martin Diehl says if we get a -EPIPE we should
1703                          * be fine and we don't need to do a usb_clear_halt().
1704                          * - Jean II */
1705                         IRDA_DEBUG(0, "%s(), Received -EPIPE, ignoring...\n", __FUNCTION__);
1706                         break;
1707                 default:
1708                         IRDA_DEBUG(0, "%s(), Unknown error %d\n", __FUNCTION__, ret);
1709                         ret = -EIO;
1710                         goto err_out_3;
1711         }
1712
1713         /* Find our endpoints */
1714         interface = intf->cur_altsetting;
1715         if(!irda_usb_parse_endpoints(self, interface->endpoint,
1716                                      interface->desc.bNumEndpoints)) {
1717                 IRDA_ERROR("%s(), Bogus endpoints...\n", __FUNCTION__);
1718                 ret = -EIO;
1719                 goto err_out_3;
1720         }
1721
1722         self->usbdev = dev;
1723
1724         /* Find IrDA class descriptor */
1725         irda_desc = irda_usb_find_class_desc(intf);
1726         ret = -ENODEV;
1727         if (irda_desc == NULL)
1728                 goto err_out_3;
1729
1730         if (self->needspatch) {
1731                 ret = usb_control_msg (self->usbdev, usb_sndctrlpipe (self->usbdev, 0),
1732                                        0x02, 0x40, 0, 0, NULL, 0, 500);
1733                 if (ret < 0) {
1734                         IRDA_DEBUG (0, "usb_control_msg failed %d\n", ret);
1735                         goto err_out_3;
1736                 } else {
1737                         mdelay(10);
1738                 }
1739         }
1740
1741         self->irda_desc =  irda_desc;
1742         self->present = 1;
1743         self->netopen = 0;
1744         self->usbintf = intf;
1745
1746         /* Allocate the buffer for speed changes */
1747         /* Don't change this buffer size and allocation without doing
1748          * some heavy and complete testing. Don't ask why :-(
1749          * Jean II */
1750         self->speed_buff = (char *) kmalloc(IRDA_USB_SPEED_MTU, GFP_KERNEL);
1751         if (self->speed_buff == NULL) 
1752                 goto err_out_3;
1753
1754         memset(self->speed_buff, 0, IRDA_USB_SPEED_MTU);
1755
1756         ret = irda_usb_open(self);
1757         if (ret) 
1758                 goto err_out_4;
1759
1760         IRDA_MESSAGE("IrDA: Registered device %s\n", net->name);
1761         usb_set_intfdata(intf, self);
1762
1763         if (self->needspatch) {
1764                 /* Now we fetch and upload the firmware patch */
1765                 ret = stir421x_patch_device(self);
1766                 self->needspatch = (ret < 0);
1767                 if (self->needspatch) {
1768                         IRDA_ERROR("STIR421X: Couldn't upload patch\n");
1769                         goto err_out_5;
1770                 }
1771
1772                 /* replace IrDA class descriptor with what patched device is now reporting */
1773                 irda_desc = irda_usb_find_class_desc (self->usbintf);
1774                 if (irda_desc == NULL) {
1775                         ret = -ENODEV;
1776                         goto err_out_5;
1777                 }
1778                 if (self->irda_desc)
1779                         kfree (self->irda_desc);
1780                 self->irda_desc = irda_desc;
1781                 irda_usb_init_qos(self);
1782         }
1783
1784         return 0;
1785
1786 err_out_5:
1787         unregister_netdev(self->netdev);
1788 err_out_4:
1789         kfree(self->speed_buff);
1790 err_out_3:
1791         /* Free all urbs that we may have created */
1792         usb_free_urb(self->speed_urb);
1793 err_out_2:
1794         usb_free_urb(self->tx_urb);
1795 err_out_1:
1796         for (i = 0; i < self->max_rx_urb; i++) {
1797                 if (self->rx_urb[i])
1798                         usb_free_urb(self->rx_urb[i]);
1799         }
1800         free_netdev(net);
1801 err_out:
1802         return ret;
1803 }
1804
1805 /*------------------------------------------------------------------*/
1806 /*
1807  * The current irda-usb device is removed, the USB layer tell us
1808  * to shut it down...
1809  * One of the constraints is that when we exit this function,
1810  * we cannot use the usb_device no more. Gone. Destroyed. kfree().
1811  * Most other subsystem allow you to destroy the instance at a time
1812  * when it's convenient to you, to postpone it to a later date, but
1813  * not the USB subsystem.
1814  * So, we must make bloody sure that everything gets deactivated.
1815  * Jean II
1816  */
1817 static void irda_usb_disconnect(struct usb_interface *intf)
1818 {
1819         unsigned long flags;
1820         struct irda_usb_cb *self = usb_get_intfdata(intf);
1821         int i;
1822
1823         IRDA_DEBUG(1, "%s()\n", __FUNCTION__);
1824
1825         usb_set_intfdata(intf, NULL);
1826         if (!self)
1827                 return;
1828
1829         /* Make sure that the Tx path is not executing. - Jean II */
1830         spin_lock_irqsave(&self->lock, flags);
1831
1832         /* Oups ! We are not there any more.
1833          * This will stop/desactivate the Tx path. - Jean II */
1834         self->present = 0;
1835
1836         /* Kill defered Rx URB */
1837         del_timer(&self->rx_defer_timer);
1838
1839         /* We need to have irq enabled to unlink the URBs. That's OK,
1840          * at this point the Tx path is gone - Jean II */
1841         spin_unlock_irqrestore(&self->lock, flags);
1842
1843         /* Hum... Check if networking is still active (avoid races) */
1844         if((self->netopen) || (self->irlap)) {
1845                 /* Accept no more transmissions */
1846                 /*netif_device_detach(self->netdev);*/
1847                 netif_stop_queue(self->netdev);
1848                 /* Stop all the receive URBs. Must be synchronous. */
1849                 for (i = 0; i < self->max_rx_urb; i++)
1850                         usb_kill_urb(self->rx_urb[i]);
1851                 /* Cancel Tx and speed URB.
1852                  * Make sure it's synchronous to avoid races. */
1853                 usb_kill_urb(self->tx_urb);
1854                 usb_kill_urb(self->speed_urb);
1855         }
1856
1857         /* Cleanup the device stuff */
1858         irda_usb_close(self);
1859         /* No longer attached to USB bus */
1860         self->usbdev = NULL;
1861         self->usbintf = NULL;
1862
1863         /* Clean up our urbs */
1864         for (i = 0; i < self->max_rx_urb; i++)
1865                 usb_free_urb(self->rx_urb[i]);
1866         kfree(self->rx_urb);
1867         /* Clean up Tx and speed URB */
1868         usb_free_urb(self->tx_urb);
1869         usb_free_urb(self->speed_urb);
1870
1871         /* Free self and network device */
1872         free_netdev(self->netdev);
1873         IRDA_DEBUG(0, "%s(), USB IrDA Disconnected\n", __FUNCTION__);
1874 }
1875
1876 /*------------------------------------------------------------------*/
1877 /*
1878  * USB device callbacks
1879  */
1880 static struct usb_driver irda_driver = {
1881         .name           = "irda-usb",
1882         .probe          = irda_usb_probe,
1883         .disconnect     = irda_usb_disconnect,
1884         .id_table       = dongles,
1885 };
1886
1887 /************************* MODULE CALLBACKS *************************/
1888 /*
1889  * Deal with module insertion/removal
1890  * Mostly tell USB about our existence
1891  */
1892
1893 /*------------------------------------------------------------------*/
1894 /*
1895  * Module insertion
1896  */
1897 static int __init usb_irda_init(void)
1898 {
1899         int     ret;
1900
1901         ret = usb_register(&irda_driver);
1902         if (ret < 0)
1903                 return ret;
1904
1905         IRDA_MESSAGE("USB IrDA support registered\n");
1906         return 0;
1907 }
1908 module_init(usb_irda_init);
1909
1910 /*------------------------------------------------------------------*/
1911 /*
1912  * Module removal
1913  */
1914 static void __exit usb_irda_cleanup(void)
1915 {
1916         /* Deregister the driver and remove all pending instances */
1917         usb_deregister(&irda_driver);
1918 }
1919 module_exit(usb_irda_cleanup);
1920
1921 /*------------------------------------------------------------------*/
1922 /*
1923  * Module parameters
1924  */
1925 module_param(qos_mtt_bits, int, 0);
1926 MODULE_PARM_DESC(qos_mtt_bits, "Minimum Turn Time");
1927 MODULE_AUTHOR("Roman Weissgaerber <weissg@vienna.at>, Dag Brattli <dag@brattli.net>, Jean Tourrilhes <jt@hpl.hp.com> and Nick Fedchik <nick@fedchik.org.ua>");
1928 MODULE_DESCRIPTION("IrDA-USB Dongle Driver");
1929 MODULE_LICENSE("GPL");