1 /*****************************************************************************
5 * Description: IrDA-USB Driver
7 * Author: Dag Brattli <dag@brattli.net>
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>
13 * This program is free software; you can redistribute it and/or modify
14 * it under the terms of the GNU General Public License as published by
15 * the Free Software Foundation; either version 2 of the License, or
16 * (at your option) any later version.
18 * This program is distributed in the hope that it will be useful,
19 * but WITHOUT ANY WARRANTY; without even the implied warranty of
20 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
21 * GNU General Public License for more details.
23 * You should have received a copy of the GNU General Public License
24 * along with this program; if not, write to the Free Software
25 * Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
27 *****************************************************************************/
33 * As of kernel 2.5.20, this is the state of compliance and testing of
34 * this driver (irda-usb) with regards to the USB low level drivers...
36 * This driver has been tested SUCCESSFULLY with the following drivers :
37 * o usb-uhci-hcd (For Intel/Via USB controllers)
38 * o uhci-hcd (Alternate/JE driver for Intel/Via USB controllers)
39 * o ohci-hcd (For other USB controllers)
41 * This driver has NOT been tested with the following drivers :
42 * o ehci-hcd (USB 2.0 controllers)
44 * Note that all HCD drivers do URB_ZERO_PACKET and timeout properly,
45 * so we don't have to worry about that anymore.
46 * One common problem is the failure to set the address on the dongle,
47 * but this happens before the driver gets loaded...
52 /*------------------------------------------------------------------*/
54 #include <linux/module.h>
55 #include <linux/moduleparam.h>
56 #include <linux/kernel.h>
57 #include <linux/types.h>
58 #include <linux/init.h>
59 #include <linux/skbuff.h>
60 #include <linux/netdevice.h>
61 #include <linux/slab.h>
62 #include <linux/rtnetlink.h>
63 #include <linux/usb.h>
67 /*------------------------------------------------------------------*/
69 static int qos_mtt_bits = 0;
71 /* These are the currently known IrDA USB dongles. Add new dongles here */
72 static struct usb_device_id dongles[] = {
73 /* ACTiSYS Corp., ACT-IR2000U FIR-USB Adapter */
74 { USB_DEVICE(0x9c4, 0x011), .driver_info = IUC_SPEED_BUG | IUC_NO_WINDOW },
75 /* Look like ACTiSYS, Report : IBM Corp., IBM UltraPort IrDA */
76 { USB_DEVICE(0x4428, 0x012), .driver_info = IUC_SPEED_BUG | IUC_NO_WINDOW },
77 /* KC Technology Inc., KC-180 USB IrDA Device */
78 { USB_DEVICE(0x50f, 0x180), .driver_info = IUC_SPEED_BUG | IUC_NO_WINDOW },
79 /* Extended Systems, Inc., XTNDAccess IrDA USB (ESI-9685) */
80 { USB_DEVICE(0x8e9, 0x100), .driver_info = IUC_SPEED_BUG | IUC_NO_WINDOW },
81 { .match_flags = USB_DEVICE_ID_MATCH_INT_CLASS |
82 USB_DEVICE_ID_MATCH_INT_SUBCLASS,
83 .bInterfaceClass = USB_CLASS_APP_SPEC,
84 .bInterfaceSubClass = USB_CLASS_IRDA,
85 .driver_info = IUC_DEFAULT, },
91 * Devices based on the SigmaTel chipset (0x66f, 0x4200) are not designed
92 * using the "USB-IrDA specification" (yes, there exist such a thing), and
93 * therefore not supported by this driver (don't add them above).
94 * There is a Linux driver, stir4200, that support those USB devices.
98 MODULE_DEVICE_TABLE(usb, dongles);
100 /*------------------------------------------------------------------*/
102 static struct irda_class_desc *irda_usb_find_class_desc(struct usb_interface *intf);
103 static void irda_usb_disconnect(struct usb_interface *intf);
104 static void irda_usb_change_speed_xbofs(struct irda_usb_cb *self);
105 static int irda_usb_hard_xmit(struct sk_buff *skb, struct net_device *dev);
106 static int irda_usb_open(struct irda_usb_cb *self);
107 static void irda_usb_close(struct irda_usb_cb *self);
108 static void speed_bulk_callback(struct urb *urb, struct pt_regs *regs);
109 static void write_bulk_callback(struct urb *urb, struct pt_regs *regs);
110 static void irda_usb_receive(struct urb *urb, struct pt_regs *regs);
111 static void irda_usb_rx_defer_expired(unsigned long data);
112 static int irda_usb_net_open(struct net_device *dev);
113 static int irda_usb_net_close(struct net_device *dev);
114 static int irda_usb_net_ioctl(struct net_device *dev, struct ifreq *rq, int cmd);
115 static void irda_usb_net_timeout(struct net_device *dev);
116 static struct net_device_stats *irda_usb_net_get_stats(struct net_device *dev);
118 /************************ TRANSMIT ROUTINES ************************/
120 * Receive packets from the IrDA stack and send them on the USB pipe.
121 * Handle speed change, timeout and lot's of ugliness...
124 /*------------------------------------------------------------------*/
126 * Function irda_usb_build_header(self, skb, header)
128 * Builds USB-IrDA outbound header
130 * When we send an IrDA frame over an USB pipe, we add to it a 1 byte
131 * header. This function create this header with the proper values.
133 * Important note : the USB-IrDA spec 1.0 say very clearly in chapter 5.4.2.2
134 * that the setting of the link speed and xbof number in this outbound header
135 * should be applied *AFTER* the frame has been sent.
136 * Unfortunately, some devices are not compliant with that... It seems that
137 * reading the spec is far too difficult...
140 static void irda_usb_build_header(struct irda_usb_cb *self,
144 /* Set the negotiated link speed */
145 if (self->new_speed != -1) {
146 /* Hum... Ugly hack :-(
147 * Some device are not compliant with the spec and change
148 * parameters *before* sending the frame. - Jean II
150 if ((self->capability & IUC_SPEED_BUG) &&
151 (!force) && (self->speed != -1)) {
152 /* No speed and xbofs change here
153 * (we'll do it later in the write callback) */
154 IRDA_DEBUG(2, "%s(), not changing speed yet\n", __FUNCTION__);
159 IRDA_DEBUG(2, "%s(), changing speed to %d\n", __FUNCTION__, self->new_speed);
160 self->speed = self->new_speed;
161 /* We will do ` self->new_speed = -1; ' in the completion
162 * handler just in case the current URB fail - Jean II */
164 switch (self->speed) {
166 *header = SPEED_2400;
170 *header = SPEED_9600;
173 *header = SPEED_19200;
176 *header = SPEED_38400;
179 *header = SPEED_57600;
182 *header = SPEED_115200;
185 *header = SPEED_576000;
188 *header = SPEED_1152000;
191 *header = SPEED_4000000;
199 /* Set the negotiated additional XBOFS */
200 if (self->new_xbofs != -1) {
201 IRDA_DEBUG(2, "%s(), changing xbofs to %d\n", __FUNCTION__, self->new_xbofs);
202 self->xbofs = self->new_xbofs;
203 /* We will do ` self->new_xbofs = -1; ' in the completion
204 * handler just in case the current URB fail - Jean II */
206 switch (self->xbofs) {
211 case 24: /* USB spec 1.0 says 24 */
218 case 5: /* Bug in IrLAP spec? (should be 6) */
238 /*------------------------------------------------------------------*/
240 * Send a command to change the speed of the dongle
241 * Need to be called with spinlock on.
243 static void irda_usb_change_speed_xbofs(struct irda_usb_cb *self)
249 IRDA_DEBUG(2, "%s(), speed=%d, xbofs=%d\n", __FUNCTION__,
250 self->new_speed, self->new_xbofs);
252 /* Grab the speed URB */
253 urb = self->speed_urb;
254 if (urb->status != 0) {
255 IRDA_WARNING("%s(), URB still in use!\n", __FUNCTION__);
259 /* Allocate the fake frame */
260 frame = self->speed_buff;
262 /* Set the new speed and xbofs in this fake frame */
263 irda_usb_build_header(self, frame, 1);
265 /* Submit the 0 length IrDA frame to trigger new speed settings */
266 usb_fill_bulk_urb(urb, self->usbdev,
267 usb_sndbulkpipe(self->usbdev, self->bulk_out_ep),
268 frame, IRDA_USB_SPEED_MTU,
269 speed_bulk_callback, self);
270 urb->transfer_buffer_length = USB_IRDA_HEADER;
271 urb->transfer_flags = 0;
273 /* Irq disabled -> GFP_ATOMIC */
274 if ((ret = usb_submit_urb(urb, GFP_ATOMIC))) {
275 IRDA_WARNING("%s(), failed Speed URB\n", __FUNCTION__);
279 /*------------------------------------------------------------------*/
282 * Now, we can only get called for the speed URB.
284 static void speed_bulk_callback(struct urb *urb, struct pt_regs *regs)
286 struct irda_usb_cb *self = urb->context;
288 IRDA_DEBUG(2, "%s()\n", __FUNCTION__);
290 /* We should always have a context */
291 IRDA_ASSERT(self != NULL, return;);
292 /* We should always be called for the speed URB */
293 IRDA_ASSERT(urb == self->speed_urb, return;);
295 /* Check for timeout and other USB nasties */
296 if (urb->status != 0) {
297 /* I get a lot of -ECONNABORTED = -103 here - Jean II */
298 IRDA_DEBUG(0, "%s(), URB complete status %d, transfer_flags 0x%04X\n", __FUNCTION__, urb->status, urb->transfer_flags);
300 /* Don't do anything here, that might confuse the USB layer.
301 * Instead, we will wait for irda_usb_net_timeout(), the
302 * network layer watchdog, to fix the situation.
304 /* A reset of the dongle might be welcomed here - Jean II */
308 /* urb is now available */
309 //urb->status = 0; -> tested above
311 /* New speed and xbof is now commited in hardware */
312 self->new_speed = -1;
313 self->new_xbofs = -1;
315 /* Allow the stack to send more packets */
316 netif_wake_queue(self->netdev);
319 /*------------------------------------------------------------------*/
321 * Send an IrDA frame to the USB dongle (for transmission)
323 static int irda_usb_hard_xmit(struct sk_buff *skb, struct net_device *netdev)
325 struct irda_usb_cb *self = netdev->priv;
326 struct urb *urb = self->tx_urb;
331 int err = 1; /* Failed */
333 IRDA_DEBUG(4, "%s() on %s\n", __FUNCTION__, netdev->name);
335 netif_stop_queue(netdev);
337 /* Protect us from USB callbacks, net watchdog and else. */
338 spin_lock_irqsave(&self->lock, flags);
340 /* Check if the device is still there.
341 * We need to check self->present under the spinlock because
342 * of irda_usb_disconnect() is synchronous - Jean II */
343 if (!self->present) {
344 IRDA_DEBUG(0, "%s(), Device is gone...\n", __FUNCTION__);
348 /* Check if we need to change the number of xbofs */
349 xbofs = irda_get_next_xbofs(skb);
350 if ((xbofs != self->xbofs) && (xbofs != -1)) {
351 self->new_xbofs = xbofs;
354 /* Check if we need to change the speed */
355 speed = irda_get_next_speed(skb);
356 if ((speed != self->speed) && (speed != -1)) {
357 /* Set the desired speed */
358 self->new_speed = speed;
360 /* Check for empty frame */
362 /* IrLAP send us an empty frame to make us change the
363 * speed. Changing speed with the USB adapter is in
364 * fact sending an empty frame to the adapter, so we
365 * could just let the present function do its job.
366 * However, we would wait for min turn time,
367 * do an extra memcpy and increment packet counters...
369 irda_usb_change_speed_xbofs(self);
370 netdev->trans_start = jiffies;
371 /* Will netif_wake_queue() in callback */
372 err = 0; /* No error */
377 if (urb->status != 0) {
378 IRDA_WARNING("%s(), URB still in use!\n", __FUNCTION__);
382 /* Make sure there is room for IrDA-USB header. The actual
383 * allocation will be done lower in skb_push().
384 * Also, we don't use directly skb_cow(), because it require
385 * headroom >= 16, which force unnecessary copies - Jean II */
386 if (skb_headroom(skb) < USB_IRDA_HEADER) {
387 IRDA_DEBUG(0, "%s(), Insuficient skb headroom.\n", __FUNCTION__);
388 if (skb_cow(skb, USB_IRDA_HEADER)) {
389 IRDA_WARNING("%s(), failed skb_cow() !!!\n", __FUNCTION__);
394 /* Change setting for next frame */
395 irda_usb_build_header(self, skb_push(skb, USB_IRDA_HEADER), 0);
397 /* FIXME: Make macro out of this one */
398 ((struct irda_skb_cb *)skb->cb)->context = self;
400 usb_fill_bulk_urb(urb, self->usbdev,
401 usb_sndbulkpipe(self->usbdev, self->bulk_out_ep),
402 skb->data, IRDA_SKB_MAX_MTU,
403 write_bulk_callback, skb);
404 urb->transfer_buffer_length = skb->len;
405 /* This flag (URB_ZERO_PACKET) indicates that what we send is not
406 * a continuous stream of data but separate packets.
407 * In this case, the USB layer will insert an empty USB frame (TD)
408 * after each of our packets that is exact multiple of the frame size.
409 * This is how the dongle will detect the end of packet - Jean II */
410 urb->transfer_flags = URB_ZERO_PACKET;
412 /* Generate min turn time. FIXME: can we do better than this? */
413 /* Trying to a turnaround time at this level is trying to measure
414 * processor clock cycle with a wrist-watch, approximate at best...
416 * What we know is the last time we received a frame over USB.
417 * Due to latency over USB that depend on the USB load, we don't
418 * know when this frame was received over IrDA (a few ms before ?)
419 * Then, same story for our outgoing frame...
421 * In theory, the USB dongle is supposed to handle the turnaround
422 * by itself (spec 1.0, chater 4, page 6). Who knows ??? That's
423 * why this code is enabled only for dongles that doesn't meet
426 if (self->capability & IUC_NO_TURN) {
427 mtt = irda_get_mtt(skb);
430 do_gettimeofday(&self->now);
431 diff = self->now.tv_usec - self->stamp.tv_usec;
432 #ifdef IU_USB_MIN_RTT
433 /* Factor in USB delays -> Get rid of udelay() that
434 * would be lost in the noise - Jean II */
435 diff += IU_USB_MIN_RTT;
436 #endif /* IU_USB_MIN_RTT */
437 /* If the usec counter did wraparound, the diff will
438 * go negative (tv_usec is a long), so we need to
439 * correct it by one second. Jean II */
443 /* Check if the mtt is larger than the time we have
444 * already used by all the protocol processing
456 /* Ask USB to send the packet - Irq disabled -> GFP_ATOMIC */
457 if ((res = usb_submit_urb(urb, GFP_ATOMIC))) {
458 IRDA_WARNING("%s(), failed Tx URB\n", __FUNCTION__);
459 self->stats.tx_errors++;
460 /* Let USB recover : We will catch that in the watchdog */
461 /*netif_start_queue(netdev);*/
463 /* Increment packet stats */
464 self->stats.tx_packets++;
465 self->stats.tx_bytes += skb->len;
467 netdev->trans_start = jiffies;
469 spin_unlock_irqrestore(&self->lock, flags);
474 /* Drop silently the skb and exit */
476 spin_unlock_irqrestore(&self->lock, flags);
477 return err; /* Usually 1 */
480 /*------------------------------------------------------------------*/
482 * Note : this function will be called only for tx_urb...
484 static void write_bulk_callback(struct urb *urb, struct pt_regs *regs)
487 struct sk_buff *skb = urb->context;
488 struct irda_usb_cb *self = ((struct irda_skb_cb *) skb->cb)->context;
490 IRDA_DEBUG(2, "%s()\n", __FUNCTION__);
492 /* We should always have a context */
493 IRDA_ASSERT(self != NULL, return;);
494 /* We should always be called for the speed URB */
495 IRDA_ASSERT(urb == self->tx_urb, return;);
497 /* Free up the skb */
498 dev_kfree_skb_any(skb);
501 /* Check for timeout and other USB nasties */
502 if (urb->status != 0) {
503 /* I get a lot of -ECONNABORTED = -103 here - Jean II */
504 IRDA_DEBUG(0, "%s(), URB complete status %d, transfer_flags 0x%04X\n", __FUNCTION__, urb->status, urb->transfer_flags);
506 /* Don't do anything here, that might confuse the USB layer,
507 * and we could go in recursion and blow the kernel stack...
508 * Instead, we will wait for irda_usb_net_timeout(), the
509 * network layer watchdog, to fix the situation.
511 /* A reset of the dongle might be welcomed here - Jean II */
515 /* urb is now available */
516 //urb->status = 0; -> tested above
518 /* Make sure we read self->present properly */
519 spin_lock_irqsave(&self->lock, flags);
521 /* If the network is closed, stop everything */
522 if ((!self->netopen) || (!self->present)) {
523 IRDA_DEBUG(0, "%s(), Network is gone...\n", __FUNCTION__);
524 spin_unlock_irqrestore(&self->lock, flags);
528 /* If changes to speed or xbofs is pending... */
529 if ((self->new_speed != -1) || (self->new_xbofs != -1)) {
530 if ((self->new_speed != self->speed) ||
531 (self->new_xbofs != self->xbofs)) {
532 /* We haven't changed speed yet (because of
533 * IUC_SPEED_BUG), so do it now - Jean II */
534 IRDA_DEBUG(1, "%s(), Changing speed now...\n", __FUNCTION__);
535 irda_usb_change_speed_xbofs(self);
537 /* New speed and xbof is now commited in hardware */
538 self->new_speed = -1;
539 self->new_xbofs = -1;
540 /* Done, waiting for next packet */
541 netif_wake_queue(self->netdev);
544 /* Otherwise, allow the stack to send more packets */
545 netif_wake_queue(self->netdev);
547 spin_unlock_irqrestore(&self->lock, flags);
550 /*------------------------------------------------------------------*/
552 * Watchdog timer from the network layer.
553 * After a predetermined timeout, if we don't give confirmation that
554 * the packet has been sent (i.e. no call to netif_wake_queue()),
555 * the network layer will call this function.
556 * Note that URB that we submit have also a timeout. When the URB timeout
557 * expire, the normal URB callback is called (write_bulk_callback()).
559 static void irda_usb_net_timeout(struct net_device *netdev)
562 struct irda_usb_cb *self = netdev->priv;
564 int done = 0; /* If we have made any progress */
566 IRDA_DEBUG(0, "%s(), Network layer thinks we timed out!\n", __FUNCTION__);
567 IRDA_ASSERT(self != NULL, return;);
569 /* Protect us from USB callbacks, net Tx and else. */
570 spin_lock_irqsave(&self->lock, flags);
572 /* self->present *MUST* be read under spinlock */
573 if (!self->present) {
574 IRDA_WARNING("%s(), device not present!\n", __FUNCTION__);
575 netif_stop_queue(netdev);
576 spin_unlock_irqrestore(&self->lock, flags);
580 /* Check speed URB */
581 urb = self->speed_urb;
582 if (urb->status != 0) {
583 IRDA_DEBUG(0, "%s: Speed change timed out, urb->status=%d, urb->transfer_flags=0x%04X\n", netdev->name, urb->status, urb->transfer_flags);
585 switch (urb->status) {
588 /* Note : above will *NOT* call netif_wake_queue()
589 * in completion handler, we will come back here.
593 case -ECONNABORTED: /* -103 */
594 case -ECONNRESET: /* -104 */
595 case -ETIMEDOUT: /* -110 */
596 case -ENOENT: /* -2 (urb unlinked by us) */
597 default: /* ??? - Play safe */
599 netif_wake_queue(self->netdev);
607 if (urb->status != 0) {
608 struct sk_buff *skb = urb->context;
610 IRDA_DEBUG(0, "%s: Tx timed out, urb->status=%d, urb->transfer_flags=0x%04X\n", netdev->name, urb->status, urb->transfer_flags);
612 /* Increase error count */
613 self->stats.tx_errors++;
615 #ifdef IU_BUG_KICK_TIMEOUT
616 /* Can't be a bad idea to reset the speed ;-) - Jean II */
617 if(self->new_speed == -1)
618 self->new_speed = self->speed;
619 if(self->new_xbofs == -1)
620 self->new_xbofs = self->xbofs;
621 irda_usb_change_speed_xbofs(self);
622 #endif /* IU_BUG_KICK_TIMEOUT */
624 switch (urb->status) {
627 /* Note : above will *NOT* call netif_wake_queue()
628 * in completion handler, because urb->status will
629 * be -ENOENT. We will fix that at the next watchdog,
630 * leaving more time to USB to recover...
634 case -ECONNABORTED: /* -103 */
635 case -ECONNRESET: /* -104 */
636 case -ETIMEDOUT: /* -110 */
637 case -ENOENT: /* -2 (urb unlinked by us) */
638 default: /* ??? - Play safe */
640 dev_kfree_skb_any(skb);
644 netif_wake_queue(self->netdev);
649 spin_unlock_irqrestore(&self->lock, flags);
651 /* Maybe we need a reset */
652 /* Note : Some drivers seem to use a usb_set_interface() when they
653 * need to reset the hardware. Hum...
659 /************************* RECEIVE ROUTINES *************************/
661 * Receive packets from the USB layer stack and pass them to the IrDA stack.
662 * Try to work around USB failures...
667 * Some of you may have noticed that most dongle have an interrupt in pipe
668 * that we don't use. Here is the little secret...
669 * When we hang a Rx URB on the bulk in pipe, it generates some USB traffic
670 * in every USB frame. This is unnecessary overhead.
671 * The interrupt in pipe will generate an event every time a packet is
672 * received. Reading an interrupt pipe adds minimal overhead, but has some
674 * If we are connected (speed != 9600), we want to minimise latency, so
675 * we just always hang the Rx URB and ignore the interrupt.
676 * If we are not connected (speed == 9600), there is usually no Rx traffic,
677 * and we want to minimise the USB overhead. In this case we should wait
678 * on the interrupt pipe and hang the Rx URB only when an interrupt is
682 * Note : don't read the above as what we are currently doing, but as
683 * something we could do with KC dongle. Also don't forget that the
684 * interrupt pipe is not part of the original standard, so this would
685 * need to be optional...
689 /*------------------------------------------------------------------*/
691 * Submit a Rx URB to the USB layer to handle reception of a frame
692 * Mostly called by the completion callback of the previous URB.
696 static void irda_usb_submit(struct irda_usb_cb *self, struct sk_buff *skb, struct urb *urb)
698 struct irda_skb_cb *cb;
701 IRDA_DEBUG(2, "%s()\n", __FUNCTION__);
703 /* This should never happen */
704 IRDA_ASSERT(skb != NULL, return;);
705 IRDA_ASSERT(urb != NULL, return;);
707 /* Save ourselves in the skb */
708 cb = (struct irda_skb_cb *) skb->cb;
711 /* Reinitialize URB */
712 usb_fill_bulk_urb(urb, self->usbdev,
713 usb_rcvbulkpipe(self->usbdev, self->bulk_in_ep),
714 skb->data, IRDA_SKB_MAX_MTU,
715 irda_usb_receive, skb);
718 /* Can be called from irda_usb_receive (irq handler) -> GFP_ATOMIC */
719 ret = usb_submit_urb(urb, GFP_ATOMIC);
721 /* If this ever happen, we are in deep s***.
722 * Basically, the Rx path will stop... */
723 IRDA_WARNING("%s(), Failed to submit Rx URB %d\n",
728 /*------------------------------------------------------------------*/
730 * Function irda_usb_receive(urb)
732 * Called by the USB subsystem when a frame has been received
735 static void irda_usb_receive(struct urb *urb, struct pt_regs *regs)
737 struct sk_buff *skb = (struct sk_buff *) urb->context;
738 struct irda_usb_cb *self;
739 struct irda_skb_cb *cb;
740 struct sk_buff *newskb;
741 struct sk_buff *dataskb;
742 struct urb *next_urb;
743 unsigned int len, docopy;
745 IRDA_DEBUG(2, "%s(), len=%d\n", __FUNCTION__, urb->actual_length);
748 cb = (struct irda_skb_cb *) skb->cb;
749 IRDA_ASSERT(cb != NULL, return;);
750 self = (struct irda_usb_cb *) cb->context;
751 IRDA_ASSERT(self != NULL, return;);
753 /* If the network is closed or the device gone, stop everything */
754 if ((!self->netopen) || (!self->present)) {
755 IRDA_DEBUG(0, "%s(), Network is gone!\n", __FUNCTION__);
756 /* Don't re-submit the URB : will stall the Rx path */
760 /* Check the status */
761 if (urb->status != 0) {
762 switch (urb->status) {
764 self->stats.rx_crc_errors++;
765 /* Also precursor to a hot-unplug on UHCI. */
767 case -ECONNRESET: /* -104 */
768 /* Random error, if I remember correctly */
769 /* uhci_cleanup_unlink() is going to kill the Rx
770 * URB just after we return. No problem, at this
771 * point the URB will be idle ;-) - Jean II */
772 case -ESHUTDOWN: /* -108 */
773 /* That's usually a hot-unplug. Submit will fail... */
774 case -ETIMEDOUT: /* -110 */
775 /* Usually precursor to a hot-unplug on OHCI. */
777 self->stats.rx_errors++;
778 IRDA_DEBUG(0, "%s(), RX status %d, transfer_flags 0x%04X \n", __FUNCTION__, urb->status, urb->transfer_flags);
781 /* If we received an error, we don't want to resubmit the
782 * Rx URB straight away but to give the USB layer a little
783 * bit of breathing room.
784 * We are in the USB thread context, therefore there is a
785 * danger of recursion (new URB we submit fails, we come
787 * With recent USB stack (2.6.15+), I'm seeing that on
788 * hot unplug of the dongle...
789 * Lowest effective timer is 10ms...
791 self->rx_defer_timer.function = &irda_usb_rx_defer_expired;
792 self->rx_defer_timer.data = (unsigned long) urb;
793 mod_timer(&self->rx_defer_timer, jiffies + (10 * HZ / 1000));
797 /* Check for empty frames */
798 if (urb->actual_length <= USB_IRDA_HEADER) {
799 IRDA_WARNING("%s(), empty frame!\n", __FUNCTION__);
804 * Remember the time we received this frame, so we can
805 * reduce the min turn time a bit since we will know
806 * how much time we have used for protocol processing
808 do_gettimeofday(&self->stamp);
810 /* Check if we need to copy the data to a new skb or not.
811 * For most frames, we use ZeroCopy and pass the already
812 * allocated skb up the stack.
813 * If the frame is small, it is more efficient to copy it
814 * to save memory (copy will be fast anyway - that's
815 * called Rx-copy-break). Jean II */
816 docopy = (urb->actual_length < IRDA_RX_COPY_THRESHOLD);
818 /* Allocate a new skb */
819 newskb = dev_alloc_skb(docopy ? urb->actual_length : IRDA_SKB_MAX_MTU);
821 self->stats.rx_dropped++;
822 /* We could deliver the current skb, but this would stall
823 * the Rx path. Better drop the packet... Jean II */
827 /* Make sure IP header get aligned (IrDA header is 5 bytes) */
828 /* But IrDA-USB header is 1 byte. Jean II */
829 //skb_reserve(newskb, USB_IRDA_HEADER - 1);
832 /* Copy packet, so we can recycle the original */
833 memcpy(newskb->data, skb->data, urb->actual_length);
834 /* Deliver this new skb */
836 /* And hook the old skb to the URB
837 * Note : we don't need to "clean up" the old skb,
838 * as we never touched it. Jean II */
840 /* We are using ZeroCopy. Deliver old skb */
842 /* And hook the new skb to the URB */
846 /* Set proper length on skb & remove USB-IrDA header */
847 skb_put(dataskb, urb->actual_length);
848 skb_pull(dataskb, USB_IRDA_HEADER);
850 /* Ask the networking layer to queue the packet for the IrDA stack */
851 dataskb->dev = self->netdev;
852 dataskb->mac.raw = dataskb->data;
853 dataskb->protocol = htons(ETH_P_IRDA);
857 /* Keep stats up to date */
858 self->stats.rx_bytes += len;
859 self->stats.rx_packets++;
860 self->netdev->last_rx = jiffies;
863 /* Note : at this point, the URB we've just received (urb)
864 * is still referenced by the USB layer. For example, if we
865 * have received a -ECONNRESET, uhci_cleanup_unlink() will
866 * continue to process it (in fact, cleaning it up).
867 * If we were to submit this URB, disaster would ensue.
868 * Therefore, we submit our idle URB, and put this URB in our
871 /* Note : with this scheme, we could submit the idle URB before
872 * processing the Rx URB. I don't think it would buy us anything as
873 * we are running in the USB thread context. Jean II */
874 next_urb = self->idle_rx_urb;
876 /* Recycle Rx URB : Now, the idle URB is the present one */
878 self->idle_rx_urb = urb;
880 /* Submit the idle URB to replace the URB we've just received.
881 * Do it last to avoid race conditions... Jean II */
882 irda_usb_submit(self, skb, next_urb);
885 /*------------------------------------------------------------------*/
887 * In case of errors, we want the USB layer to have time to recover.
888 * Now, it is time to resubmit ouur Rx URB...
890 static void irda_usb_rx_defer_expired(unsigned long data)
892 struct urb *urb = (struct urb *) data;
893 struct sk_buff *skb = (struct sk_buff *) urb->context;
894 struct irda_usb_cb *self;
895 struct irda_skb_cb *cb;
896 struct urb *next_urb;
898 IRDA_DEBUG(2, "%s()\n", __FUNCTION__);
901 cb = (struct irda_skb_cb *) skb->cb;
902 IRDA_ASSERT(cb != NULL, return;);
903 self = (struct irda_usb_cb *) cb->context;
904 IRDA_ASSERT(self != NULL, return;);
906 /* Same stuff as when Rx is done, see above... */
907 next_urb = self->idle_rx_urb;
909 self->idle_rx_urb = urb;
910 irda_usb_submit(self, skb, next_urb);
913 /*------------------------------------------------------------------*/
915 * Callbak from IrDA layer. IrDA wants to know if we have
916 * started receiving anything.
918 static int irda_usb_is_receiving(struct irda_usb_cb *self)
920 /* Note : because of the way UHCI works, it's almost impossible
921 * to get this info. The Controller DMA directly to memory and
922 * signal only when the whole frame is finished. To know if the
923 * first TD of the URB has been filled or not seems hard work...
925 * The other solution would be to use the "receiving" command
926 * on the default decriptor with a usb_control_msg(), but that
927 * would add USB traffic and would return result only in the
928 * next USB frame (~1ms).
930 * I've been told that current dongles send status info on their
931 * interrupt endpoint, and that's what the Windows driver uses
932 * to know this info. Unfortunately, this is not yet in the spec...
937 return 0; /* For now */
940 /********************** IRDA DEVICE CALLBACKS **********************/
942 * Main calls from the IrDA/Network subsystem.
943 * Mostly registering a new irda-usb device and removing it....
944 * We only deal with the IrDA side of the business, the USB side will
945 * be dealt with below...
949 /*------------------------------------------------------------------*/
951 * Function irda_usb_net_open (dev)
953 * Network device is taken up. Usually this is done by "ifconfig irda0 up"
955 * Note : don't mess with self->netopen - Jean II
957 static int irda_usb_net_open(struct net_device *netdev)
959 struct irda_usb_cb *self;
963 IRDA_DEBUG(1, "%s()\n", __FUNCTION__);
965 IRDA_ASSERT(netdev != NULL, return -1;);
966 self = (struct irda_usb_cb *) netdev->priv;
967 IRDA_ASSERT(self != NULL, return -1;);
969 /* Can only open the device if it's there */
971 IRDA_WARNING("%s(), device not present!\n", __FUNCTION__);
975 /* Initialise default speed and xbofs value
976 * (IrLAP will change that soon) */
979 self->new_speed = -1;
980 self->new_xbofs = -1;
982 /* To do *before* submitting Rx urbs and starting net Tx queue
987 * Now that everything should be initialized properly,
988 * Open new IrLAP layer instance to take care of us...
989 * Note : will send immediately a speed change...
991 sprintf(hwname, "usb#%d", self->usbdev->devnum);
992 self->irlap = irlap_open(netdev, &self->qos, hwname);
993 IRDA_ASSERT(self->irlap != NULL, return -1;);
995 /* Allow IrLAP to send data to us */
996 netif_start_queue(netdev);
998 /* We submit all the Rx URB except for one that we keep idle.
999 * Need to be initialised before submitting other USBs, because
1000 * in some cases as soon as we submit the URBs the USB layer
1001 * will trigger a dummy receive - Jean II */
1002 self->idle_rx_urb = self->rx_urb[IU_MAX_ACTIVE_RX_URBS];
1003 self->idle_rx_urb->context = NULL;
1005 /* Now that we can pass data to IrLAP, allow the USB layer
1006 * to send us some data... */
1007 for (i = 0; i < IU_MAX_ACTIVE_RX_URBS; i++) {
1008 struct sk_buff *skb = dev_alloc_skb(IRDA_SKB_MAX_MTU);
1010 /* If this ever happen, we are in deep s***.
1011 * Basically, we can't start the Rx path... */
1012 IRDA_WARNING("%s(), Failed to allocate Rx skb\n",
1016 //skb_reserve(newskb, USB_IRDA_HEADER - 1);
1017 irda_usb_submit(self, skb, self->rx_urb[i]);
1020 /* Ready to play !!! */
1024 /*------------------------------------------------------------------*/
1026 * Function irda_usb_net_close (self)
1028 * Network device is taken down. Usually this is done by
1029 * "ifconfig irda0 down"
1031 static int irda_usb_net_close(struct net_device *netdev)
1033 struct irda_usb_cb *self;
1036 IRDA_DEBUG(1, "%s()\n", __FUNCTION__);
1038 IRDA_ASSERT(netdev != NULL, return -1;);
1039 self = (struct irda_usb_cb *) netdev->priv;
1040 IRDA_ASSERT(self != NULL, return -1;);
1042 /* Clear this flag *before* unlinking the urbs and *before*
1043 * stopping the network Tx queue - Jean II */
1046 /* Stop network Tx queue */
1047 netif_stop_queue(netdev);
1049 /* Kill defered Rx URB */
1050 del_timer(&self->rx_defer_timer);
1052 /* Deallocate all the Rx path buffers (URBs and skb) */
1053 for (i = 0; i < IU_MAX_RX_URBS; i++) {
1054 struct urb *urb = self->rx_urb[i];
1055 struct sk_buff *skb = (struct sk_buff *) urb->context;
1056 /* Cancel the receive command */
1058 /* The skb is ours, free it */
1061 urb->context = NULL;
1064 /* Cancel Tx and speed URB - need to be synchronous to avoid races */
1065 usb_kill_urb(self->tx_urb);
1066 usb_kill_urb(self->speed_urb);
1068 /* Stop and remove instance of IrLAP */
1070 irlap_close(self->irlap);
1076 /*------------------------------------------------------------------*/
1078 * IOCTLs : Extra out-of-band network commands...
1080 static int irda_usb_net_ioctl(struct net_device *dev, struct ifreq *rq, int cmd)
1082 unsigned long flags;
1083 struct if_irda_req *irq = (struct if_irda_req *) rq;
1084 struct irda_usb_cb *self;
1087 IRDA_ASSERT(dev != NULL, return -1;);
1089 IRDA_ASSERT(self != NULL, return -1;);
1091 IRDA_DEBUG(2, "%s(), %s, (cmd=0x%X)\n", __FUNCTION__, dev->name, cmd);
1094 case SIOCSBANDWIDTH: /* Set bandwidth */
1095 if (!capable(CAP_NET_ADMIN))
1097 /* Protect us from USB callbacks, net watchdog and else. */
1098 spin_lock_irqsave(&self->lock, flags);
1099 /* Check if the device is still there */
1101 /* Set the desired speed */
1102 self->new_speed = irq->ifr_baudrate;
1103 irda_usb_change_speed_xbofs(self);
1105 spin_unlock_irqrestore(&self->lock, flags);
1107 case SIOCSMEDIABUSY: /* Set media busy */
1108 if (!capable(CAP_NET_ADMIN))
1110 /* Check if the IrDA stack is still there */
1112 irda_device_set_media_busy(self->netdev, TRUE);
1114 case SIOCGRECEIVING: /* Check if we are receiving right now */
1115 irq->ifr_receiving = irda_usb_is_receiving(self);
1124 /*------------------------------------------------------------------*/
1126 * Get device stats (for /proc/net/dev and ifconfig)
1128 static struct net_device_stats *irda_usb_net_get_stats(struct net_device *dev)
1130 struct irda_usb_cb *self = dev->priv;
1131 return &self->stats;
1134 /********************* IRDA CONFIG SUBROUTINES *********************/
1136 * Various subroutines dealing with IrDA and network stuff we use to
1137 * configure and initialise each irda-usb instance.
1138 * These functions are used below in the main calls of the driver...
1141 /*------------------------------------------------------------------*/
1143 * Set proper values in the IrDA QOS structure
1145 static inline void irda_usb_init_qos(struct irda_usb_cb *self)
1147 struct irda_class_desc *desc;
1149 IRDA_DEBUG(3, "%s()\n", __FUNCTION__);
1151 desc = self->irda_desc;
1153 /* Initialize QoS for this device */
1154 irda_init_max_qos_capabilies(&self->qos);
1156 /* See spec section 7.2 for meaning.
1157 * Values are little endian (as most USB stuff), the IrDA stack
1158 * use it in native order (see parameters.c). - Jean II */
1159 self->qos.baud_rate.bits = le16_to_cpu(desc->wBaudRate);
1160 self->qos.min_turn_time.bits = desc->bmMinTurnaroundTime;
1161 self->qos.additional_bofs.bits = desc->bmAdditionalBOFs;
1162 self->qos.window_size.bits = desc->bmWindowSize;
1163 self->qos.data_size.bits = desc->bmDataSize;
1165 IRDA_DEBUG(0, "%s(), dongle says speed=0x%X, size=0x%X, window=0x%X, bofs=0x%X, turn=0x%X\n",
1166 __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);
1168 /* Don't always trust what the dongle tell us */
1169 if(self->capability & IUC_SIR_ONLY)
1170 self->qos.baud_rate.bits &= 0x00ff;
1171 if(self->capability & IUC_SMALL_PKT)
1172 self->qos.data_size.bits = 0x07;
1173 if(self->capability & IUC_NO_WINDOW)
1174 self->qos.window_size.bits = 0x01;
1175 if(self->capability & IUC_MAX_WINDOW)
1176 self->qos.window_size.bits = 0x7f;
1177 if(self->capability & IUC_MAX_XBOFS)
1178 self->qos.additional_bofs.bits = 0x01;
1181 /* Module parameter can override the rx window size */
1183 self->qos.min_turn_time.bits = qos_mtt_bits;
1186 * Note : most of those values apply only for the receive path,
1187 * the transmit path will be set differently - Jean II
1189 irda_qos_bits_to_value(&self->qos);
1192 /*------------------------------------------------------------------*/
1194 * Initialise the network side of the irda-usb instance
1195 * Called when a new USB instance is registered in irda_usb_probe()
1197 static inline int irda_usb_open(struct irda_usb_cb *self)
1199 struct net_device *netdev = self->netdev;
1201 IRDA_DEBUG(1, "%s()\n", __FUNCTION__);
1203 irda_usb_init_qos(self);
1205 /* Override the network functions we need to use */
1206 netdev->hard_start_xmit = irda_usb_hard_xmit;
1207 netdev->tx_timeout = irda_usb_net_timeout;
1208 netdev->watchdog_timeo = 250*HZ/1000; /* 250 ms > USB timeout */
1209 netdev->open = irda_usb_net_open;
1210 netdev->stop = irda_usb_net_close;
1211 netdev->get_stats = irda_usb_net_get_stats;
1212 netdev->do_ioctl = irda_usb_net_ioctl;
1214 return register_netdev(netdev);
1217 /*------------------------------------------------------------------*/
1219 * Cleanup the network side of the irda-usb instance
1220 * Called when a USB instance is removed in irda_usb_disconnect()
1222 static inline void irda_usb_close(struct irda_usb_cb *self)
1224 IRDA_DEBUG(1, "%s()\n", __FUNCTION__);
1226 /* Remove netdevice */
1227 unregister_netdev(self->netdev);
1229 /* Remove the speed buffer */
1230 kfree(self->speed_buff);
1231 self->speed_buff = NULL;
1234 /********************** USB CONFIG SUBROUTINES **********************/
1236 * Various subroutines dealing with USB stuff we use to configure and
1237 * initialise each irda-usb instance.
1238 * These functions are used below in the main calls of the driver...
1241 /*------------------------------------------------------------------*/
1243 * Function irda_usb_parse_endpoints(dev, ifnum)
1245 * Parse the various endpoints and find the one we need.
1247 * The endpoint are the pipes used to communicate with the USB device.
1248 * The spec defines 2 endpoints of type bulk transfer, one in, and one out.
1249 * These are used to pass frames back and forth with the dongle.
1250 * Most dongle have also an interrupt endpoint, that will be probably
1251 * documented in the next spec...
1253 static inline int irda_usb_parse_endpoints(struct irda_usb_cb *self, struct usb_host_endpoint *endpoint, int ennum)
1255 int i; /* Endpoint index in table */
1257 /* Init : no endpoints */
1258 self->bulk_in_ep = 0;
1259 self->bulk_out_ep = 0;
1260 self->bulk_int_ep = 0;
1262 /* Let's look at all those endpoints */
1263 for(i = 0; i < ennum; i++) {
1264 /* All those variables will get optimised by the compiler,
1265 * so let's aim for clarity... - Jean II */
1266 __u8 ep; /* Endpoint address */
1267 __u8 dir; /* Endpoint direction */
1268 __u8 attr; /* Endpoint attribute */
1269 __u16 psize; /* Endpoint max packet size in bytes */
1271 /* Get endpoint address, direction and attribute */
1272 ep = endpoint[i].desc.bEndpointAddress & USB_ENDPOINT_NUMBER_MASK;
1273 dir = endpoint[i].desc.bEndpointAddress & USB_ENDPOINT_DIR_MASK;
1274 attr = endpoint[i].desc.bmAttributes;
1275 psize = le16_to_cpu(endpoint[i].desc.wMaxPacketSize);
1277 /* Is it a bulk endpoint ??? */
1278 if(attr == USB_ENDPOINT_XFER_BULK) {
1279 /* We need to find an IN and an OUT */
1280 if(dir == USB_DIR_IN) {
1281 /* This is our Rx endpoint */
1282 self->bulk_in_ep = ep;
1284 /* This is our Tx endpoint */
1285 self->bulk_out_ep = ep;
1286 self->bulk_out_mtu = psize;
1289 if((attr == USB_ENDPOINT_XFER_INT) &&
1290 (dir == USB_DIR_IN)) {
1291 /* This is our interrupt endpoint */
1292 self->bulk_int_ep = ep;
1294 IRDA_ERROR("%s(), Unrecognised endpoint %02X.\n", __FUNCTION__, ep);
1299 IRDA_DEBUG(0, "%s(), And our endpoints are : in=%02X, out=%02X (%d), int=%02X\n",
1300 __FUNCTION__, self->bulk_in_ep, self->bulk_out_ep, self->bulk_out_mtu, self->bulk_int_ep);
1301 /* Should be 8, 16, 32 or 64 bytes */
1302 IRDA_ASSERT(self->bulk_out_mtu == 64, ;);
1304 return((self->bulk_in_ep != 0) && (self->bulk_out_ep != 0));
1307 #ifdef IU_DUMP_CLASS_DESC
1308 /*------------------------------------------------------------------*/
1310 * Function usb_irda_dump_class_desc(desc)
1312 * Prints out the contents of the IrDA class descriptor
1315 static inline void irda_usb_dump_class_desc(struct irda_class_desc *desc)
1317 /* Values are little endian */
1318 printk("bLength=%x\n", desc->bLength);
1319 printk("bDescriptorType=%x\n", desc->bDescriptorType);
1320 printk("bcdSpecRevision=%x\n", le16_to_cpu(desc->bcdSpecRevision));
1321 printk("bmDataSize=%x\n", desc->bmDataSize);
1322 printk("bmWindowSize=%x\n", desc->bmWindowSize);
1323 printk("bmMinTurnaroundTime=%d\n", desc->bmMinTurnaroundTime);
1324 printk("wBaudRate=%x\n", le16_to_cpu(desc->wBaudRate));
1325 printk("bmAdditionalBOFs=%x\n", desc->bmAdditionalBOFs);
1326 printk("bIrdaRateSniff=%x\n", desc->bIrdaRateSniff);
1327 printk("bMaxUnicastList=%x\n", desc->bMaxUnicastList);
1329 #endif /* IU_DUMP_CLASS_DESC */
1331 /*------------------------------------------------------------------*/
1333 * Function irda_usb_find_class_desc(intf)
1335 * Returns instance of IrDA class descriptor, or NULL if not found
1337 * The class descriptor is some extra info that IrDA USB devices will
1338 * offer to us, describing their IrDA characteristics. We will use that in
1339 * irda_usb_init_qos()
1341 static inline struct irda_class_desc *irda_usb_find_class_desc(struct usb_interface *intf)
1343 struct usb_device *dev = interface_to_usbdev (intf);
1344 struct irda_class_desc *desc;
1347 desc = kmalloc(sizeof (*desc), GFP_KERNEL);
1350 memset(desc, 0, sizeof(*desc));
1352 /* USB-IrDA class spec 1.0:
1353 * 6.1.3: Standard "Get Descriptor" Device Request is not
1354 * appropriate to retrieve class-specific descriptor
1355 * 6.2.5: Class Specific "Get Class Descriptor" Interface Request
1356 * is mandatory and returns the USB-IrDA class descriptor
1359 ret = usb_control_msg(dev, usb_rcvctrlpipe(dev,0),
1360 IU_REQ_GET_CLASS_DESC,
1361 USB_DIR_IN | USB_TYPE_CLASS | USB_RECIP_INTERFACE,
1362 0, intf->altsetting->desc.bInterfaceNumber, desc,
1363 sizeof(*desc), 500);
1365 IRDA_DEBUG(1, "%s(), ret=%d\n", __FUNCTION__, ret);
1366 if (ret < sizeof(*desc)) {
1367 IRDA_WARNING("usb-irda: class_descriptor read %s (%d)\n",
1368 (ret<0) ? "failed" : "too short", ret);
1370 else if (desc->bDescriptorType != USB_DT_IRDA) {
1371 IRDA_WARNING("usb-irda: bad class_descriptor type\n");
1374 #ifdef IU_DUMP_CLASS_DESC
1375 irda_usb_dump_class_desc(desc);
1376 #endif /* IU_DUMP_CLASS_DESC */
1384 /*********************** USB DEVICE CALLBACKS ***********************/
1386 * Main calls from the USB subsystem.
1387 * Mostly registering a new irda-usb device and removing it....
1390 /*------------------------------------------------------------------*/
1392 * This routine is called by the USB subsystem for each new device
1393 * in the system. We need to check if the device is ours, and in
1394 * this case start handling it.
1395 * The USB layer protect us from reentrancy (via BKL), so we don't need
1396 * to spinlock in there... Jean II
1398 static int irda_usb_probe(struct usb_interface *intf,
1399 const struct usb_device_id *id)
1401 struct net_device *net;
1402 struct usb_device *dev = interface_to_usbdev(intf);
1403 struct irda_usb_cb *self = NULL;
1404 struct usb_host_interface *interface;
1405 struct irda_class_desc *irda_desc;
1407 int i; /* Driver instance index / Rx URB index */
1409 /* Note : the probe make sure to call us only for devices that
1410 * matches the list of dongle (top of the file). So, we
1411 * don't need to check if the dongle is really ours.
1414 IRDA_MESSAGE("IRDA-USB found at address %d, Vendor: %x, Product: %x\n",
1415 dev->devnum, le16_to_cpu(dev->descriptor.idVendor),
1416 le16_to_cpu(dev->descriptor.idProduct));
1418 net = alloc_irdadev(sizeof(*self));
1422 SET_MODULE_OWNER(net);
1423 SET_NETDEV_DEV(net, &intf->dev);
1426 spin_lock_init(&self->lock);
1427 init_timer(&self->rx_defer_timer);
1429 /* Create all of the needed urbs */
1430 for (i = 0; i < IU_MAX_RX_URBS; i++) {
1431 self->rx_urb[i] = usb_alloc_urb(0, GFP_KERNEL);
1432 if (!self->rx_urb[i]) {
1436 self->tx_urb = usb_alloc_urb(0, GFP_KERNEL);
1437 if (!self->tx_urb) {
1440 self->speed_urb = usb_alloc_urb(0, GFP_KERNEL);
1441 if (!self->speed_urb) {
1445 /* Is this really necessary? (no, except maybe for broken devices) */
1446 if (usb_reset_configuration (dev) < 0) {
1447 err("reset_configuration failed");
1452 /* Is this really necessary? */
1453 /* Note : some driver do hardcode the interface number, some others
1454 * specify an alternate, but very few driver do like this.
1456 ret = usb_set_interface(dev, intf->altsetting->desc.bInterfaceNumber, 0);
1457 IRDA_DEBUG(1, "usb-irda: set interface %d result %d\n", intf->altsetting->desc.bInterfaceNumber, ret);
1461 case -EPIPE: /* -EPIPE = -32 */
1462 /* Martin Diehl says if we get a -EPIPE we should
1463 * be fine and we don't need to do a usb_clear_halt().
1465 IRDA_DEBUG(0, "%s(), Received -EPIPE, ignoring...\n", __FUNCTION__);
1468 IRDA_DEBUG(0, "%s(), Unknown error %d\n", __FUNCTION__, ret);
1473 /* Find our endpoints */
1474 interface = intf->cur_altsetting;
1475 if(!irda_usb_parse_endpoints(self, interface->endpoint,
1476 interface->desc.bNumEndpoints)) {
1477 IRDA_ERROR("%s(), Bogus endpoints...\n", __FUNCTION__);
1482 /* Find IrDA class descriptor */
1483 irda_desc = irda_usb_find_class_desc(intf);
1485 if (irda_desc == NULL)
1488 self->irda_desc = irda_desc;
1491 self->capability = id->driver_info;
1493 self->usbintf = intf;
1495 /* Allocate the buffer for speed changes */
1496 /* Don't change this buffer size and allocation without doing
1497 * some heavy and complete testing. Don't ask why :-(
1499 self->speed_buff = (char *) kmalloc(IRDA_USB_SPEED_MTU, GFP_KERNEL);
1500 if (self->speed_buff == NULL)
1503 memset(self->speed_buff, 0, IRDA_USB_SPEED_MTU);
1505 ret = irda_usb_open(self);
1509 IRDA_MESSAGE("IrDA: Registered device %s\n", net->name);
1510 usb_set_intfdata(intf, self);
1514 kfree(self->speed_buff);
1516 /* Free all urbs that we may have created */
1517 usb_free_urb(self->speed_urb);
1519 usb_free_urb(self->tx_urb);
1521 for (i = 0; i < IU_MAX_RX_URBS; i++) {
1522 if (self->rx_urb[i])
1523 usb_free_urb(self->rx_urb[i]);
1530 /*------------------------------------------------------------------*/
1532 * The current irda-usb device is removed, the USB layer tell us
1533 * to shut it down...
1534 * One of the constraints is that when we exit this function,
1535 * we cannot use the usb_device no more. Gone. Destroyed. kfree().
1536 * Most other subsystem allow you to destroy the instance at a time
1537 * when it's convenient to you, to postpone it to a later date, but
1538 * not the USB subsystem.
1539 * So, we must make bloody sure that everything gets deactivated.
1542 static void irda_usb_disconnect(struct usb_interface *intf)
1544 unsigned long flags;
1545 struct irda_usb_cb *self = usb_get_intfdata(intf);
1548 IRDA_DEBUG(1, "%s()\n", __FUNCTION__);
1550 usb_set_intfdata(intf, NULL);
1554 /* Make sure that the Tx path is not executing. - Jean II */
1555 spin_lock_irqsave(&self->lock, flags);
1557 /* Oups ! We are not there any more.
1558 * This will stop/desactivate the Tx path. - Jean II */
1561 /* Kill defered Rx URB */
1562 del_timer(&self->rx_defer_timer);
1564 /* We need to have irq enabled to unlink the URBs. That's OK,
1565 * at this point the Tx path is gone - Jean II */
1566 spin_unlock_irqrestore(&self->lock, flags);
1568 /* Hum... Check if networking is still active (avoid races) */
1569 if((self->netopen) || (self->irlap)) {
1570 /* Accept no more transmissions */
1571 /*netif_device_detach(self->netdev);*/
1572 netif_stop_queue(self->netdev);
1573 /* Stop all the receive URBs. Must be synchronous. */
1574 for (i = 0; i < IU_MAX_RX_URBS; i++)
1575 usb_kill_urb(self->rx_urb[i]);
1576 /* Cancel Tx and speed URB.
1577 * Make sure it's synchronous to avoid races. */
1578 usb_kill_urb(self->tx_urb);
1579 usb_kill_urb(self->speed_urb);
1582 /* Cleanup the device stuff */
1583 irda_usb_close(self);
1584 /* No longer attached to USB bus */
1585 self->usbdev = NULL;
1586 self->usbintf = NULL;
1588 /* Clean up our urbs */
1589 for (i = 0; i < IU_MAX_RX_URBS; i++)
1590 usb_free_urb(self->rx_urb[i]);
1591 /* Clean up Tx and speed URB */
1592 usb_free_urb(self->tx_urb);
1593 usb_free_urb(self->speed_urb);
1595 /* Free self and network device */
1596 free_netdev(self->netdev);
1597 IRDA_DEBUG(0, "%s(), USB IrDA Disconnected\n", __FUNCTION__);
1600 /*------------------------------------------------------------------*/
1602 * USB device callbacks
1604 static struct usb_driver irda_driver = {
1606 .probe = irda_usb_probe,
1607 .disconnect = irda_usb_disconnect,
1608 .id_table = dongles,
1611 /************************* MODULE CALLBACKS *************************/
1613 * Deal with module insertion/removal
1614 * Mostly tell USB about our existence
1617 /*------------------------------------------------------------------*/
1621 static int __init usb_irda_init(void)
1625 ret = usb_register(&irda_driver);
1629 IRDA_MESSAGE("USB IrDA support registered\n");
1632 module_init(usb_irda_init);
1634 /*------------------------------------------------------------------*/
1638 static void __exit usb_irda_cleanup(void)
1640 /* Deregister the driver and remove all pending instances */
1641 usb_deregister(&irda_driver);
1643 module_exit(usb_irda_cleanup);
1645 /*------------------------------------------------------------------*/
1649 module_param(qos_mtt_bits, int, 0);
1650 MODULE_PARM_DESC(qos_mtt_bits, "Minimum Turn Time");
1651 MODULE_AUTHOR("Roman Weissgaerber <weissg@vienna.at>, Dag Brattli <dag@brattli.net> and Jean Tourrilhes <jt@hpl.hp.com>");
1652 MODULE_DESCRIPTION("IrDA-USB Dongle Driver");
1653 MODULE_LICENSE("GPL");