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linux/drivers/net/irda/irda-usb.c
Jean Tourrilhes 669d32a293 [IRDA]: irda-usb bug fixes 
This patch fixes 2 bugs in the USB-IrDA code.

The first one is a buffer overrun in the RX path. We are now using
IRDA_SKB_MAX_MTU when initializing the Rx URB.

The second one is a potential stack recursion when unplugging the USB
dongle.  It seems that first we get the Rx URB with a generic error
code, and after a while the Rx URB comes again with a "disconnect"
error code.  Since we are resubmitting the Rx URB immediately after
receiving the first error one, we might enter an endless loop.

When getting an error Rx URB, the patch defers the Rx URB resubmitting
so that it gives us a chance to catch the disconnect one, in case the
dongle has juts been unplugged.

Tested against 2.6.16-rc2.

Patch from Jean Tourrilhes

Signed-off-by: Jean Tourrilhes <jt@hpl.hp.com>
Signed-off-by: Samuel Ortiz <samuel.ortiz@nokia.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
2006-02-19 22:28:25 -08:00

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/*****************************************************************************
*
* Filename: irda-usb.c
* Version: 0.9b
* Description: IrDA-USB Driver
* Status: Experimental
* Author: Dag Brattli <dag@brattli.net>
*
* Copyright (C) 2000, Roman Weissgaerber <weissg@vienna.at>
* Copyright (C) 2001, Dag Brattli <dag@brattli.net>
* Copyright (C) 2001, Jean Tourrilhes <jt@hpl.hp.com>
*
* This program is free software; you can redistribute it and/or modify
* it under the terms of the GNU General Public License as published by
* the Free Software Foundation; either version 2 of the License, or
* (at your option) any later version.
*
* This program is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
* GNU General Public License for more details.
*
* You should have received a copy of the GNU General Public License
* along with this program; if not, write to the Free Software
* Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
*
*****************************************************************************/
/*
* IMPORTANT NOTE
* --------------
*
* As of kernel 2.5.20, this is the state of compliance and testing of
* this driver (irda-usb) with regards to the USB low level drivers...
*
* This driver has been tested SUCCESSFULLY with the following drivers :
* o usb-uhci-hcd (For Intel/Via USB controllers)
* o uhci-hcd (Alternate/JE driver for Intel/Via USB controllers)
* o ohci-hcd (For other USB controllers)
*
* This driver has NOT been tested with the following drivers :
* o ehci-hcd (USB 2.0 controllers)
*
* Note that all HCD drivers do URB_ZERO_PACKET and timeout properly,
* so we don't have to worry about that anymore.
* One common problem is the failure to set the address on the dongle,
* but this happens before the driver gets loaded...
*
* Jean II
*/
/*------------------------------------------------------------------*/
#include <linux/module.h>
#include <linux/moduleparam.h>
#include <linux/kernel.h>
#include <linux/types.h>
#include <linux/init.h>
#include <linux/skbuff.h>
#include <linux/netdevice.h>
#include <linux/slab.h>
#include <linux/rtnetlink.h>
#include <linux/usb.h>
#include "irda-usb.h"
/*------------------------------------------------------------------*/
static int qos_mtt_bits = 0;
/* These are the currently known IrDA USB dongles. Add new dongles here */
static struct usb_device_id dongles[] = {
/* ACTiSYS Corp., ACT-IR2000U FIR-USB Adapter */
{ USB_DEVICE(0x9c4, 0x011), .driver_info = IUC_SPEED_BUG | IUC_NO_WINDOW },
/* Look like ACTiSYS, Report : IBM Corp., IBM UltraPort IrDA */
{ USB_DEVICE(0x4428, 0x012), .driver_info = IUC_SPEED_BUG | IUC_NO_WINDOW },
/* KC Technology Inc., KC-180 USB IrDA Device */
{ USB_DEVICE(0x50f, 0x180), .driver_info = IUC_SPEED_BUG | IUC_NO_WINDOW },
/* Extended Systems, Inc., XTNDAccess IrDA USB (ESI-9685) */
{ USB_DEVICE(0x8e9, 0x100), .driver_info = IUC_SPEED_BUG | IUC_NO_WINDOW },
{ .match_flags = USB_DEVICE_ID_MATCH_INT_CLASS |
USB_DEVICE_ID_MATCH_INT_SUBCLASS,
.bInterfaceClass = USB_CLASS_APP_SPEC,
.bInterfaceSubClass = USB_CLASS_IRDA,
.driver_info = IUC_DEFAULT, },
{ }, /* The end */
};
/*
* Important note :
* Devices based on the SigmaTel chipset (0x66f, 0x4200) are not designed
* using the "USB-IrDA specification" (yes, there exist such a thing), and
* therefore not supported by this driver (don't add them above).
* There is a Linux driver, stir4200, that support those USB devices.
* Jean II
*/
MODULE_DEVICE_TABLE(usb, dongles);
/*------------------------------------------------------------------*/
static struct irda_class_desc *irda_usb_find_class_desc(struct usb_interface *intf);
static void irda_usb_disconnect(struct usb_interface *intf);
static void irda_usb_change_speed_xbofs(struct irda_usb_cb *self);
static int irda_usb_hard_xmit(struct sk_buff *skb, struct net_device *dev);
static int irda_usb_open(struct irda_usb_cb *self);
static void irda_usb_close(struct irda_usb_cb *self);
static void speed_bulk_callback(struct urb *urb, struct pt_regs *regs);
static void write_bulk_callback(struct urb *urb, struct pt_regs *regs);
static void irda_usb_receive(struct urb *urb, struct pt_regs *regs);
static void irda_usb_rx_defer_expired(unsigned long data);
static int irda_usb_net_open(struct net_device *dev);
static int irda_usb_net_close(struct net_device *dev);
static int irda_usb_net_ioctl(struct net_device *dev, struct ifreq *rq, int cmd);
static void irda_usb_net_timeout(struct net_device *dev);
static struct net_device_stats *irda_usb_net_get_stats(struct net_device *dev);
/************************ TRANSMIT ROUTINES ************************/
/*
* Receive packets from the IrDA stack and send them on the USB pipe.
* Handle speed change, timeout and lot's of ugliness...
*/
/*------------------------------------------------------------------*/
/*
* Function irda_usb_build_header(self, skb, header)
*
* Builds USB-IrDA outbound header
*
* When we send an IrDA frame over an USB pipe, we add to it a 1 byte
* header. This function create this header with the proper values.
*
* Important note : the USB-IrDA spec 1.0 say very clearly in chapter 5.4.2.2
* that the setting of the link speed and xbof number in this outbound header
* should be applied *AFTER* the frame has been sent.
* Unfortunately, some devices are not compliant with that... It seems that
* reading the spec is far too difficult...
* Jean II
*/
static void irda_usb_build_header(struct irda_usb_cb *self,
__u8 *header,
int force)
{
/* Set the negotiated link speed */
if (self->new_speed != -1) {
/* Hum... Ugly hack :-(
* Some device are not compliant with the spec and change
* parameters *before* sending the frame. - Jean II
*/
if ((self->capability & IUC_SPEED_BUG) &&
(!force) && (self->speed != -1)) {
/* No speed and xbofs change here
* (we'll do it later in the write callback) */
IRDA_DEBUG(2, "%s(), not changing speed yet\n", __FUNCTION__);
*header = 0;
return;
}
IRDA_DEBUG(2, "%s(), changing speed to %d\n", __FUNCTION__, self->new_speed);
self->speed = self->new_speed;
/* We will do ` self->new_speed = -1; ' in the completion
* handler just in case the current URB fail - Jean II */
switch (self->speed) {
case 2400:
*header = SPEED_2400;
break;
default:
case 9600:
*header = SPEED_9600;
break;
case 19200:
*header = SPEED_19200;
break;
case 38400:
*header = SPEED_38400;
break;
case 57600:
*header = SPEED_57600;
break;
case 115200:
*header = SPEED_115200;
break;
case 576000:
*header = SPEED_576000;
break;
case 1152000:
*header = SPEED_1152000;
break;
case 4000000:
*header = SPEED_4000000;
self->new_xbofs = 0;
break;
}
} else
/* No change */
*header = 0;
/* Set the negotiated additional XBOFS */
if (self->new_xbofs != -1) {
IRDA_DEBUG(2, "%s(), changing xbofs to %d\n", __FUNCTION__, self->new_xbofs);
self->xbofs = self->new_xbofs;
/* We will do ` self->new_xbofs = -1; ' in the completion
* handler just in case the current URB fail - Jean II */
switch (self->xbofs) {
case 48:
*header |= 0x10;
break;
case 28:
case 24: /* USB spec 1.0 says 24 */
*header |= 0x20;
break;
default:
case 12:
*header |= 0x30;
break;
case 5: /* Bug in IrLAP spec? (should be 6) */
case 6:
*header |= 0x40;
break;
case 3:
*header |= 0x50;
break;
case 2:
*header |= 0x60;
break;
case 1:
*header |= 0x70;
break;
case 0:
*header |= 0x80;
break;
}
}
}
/*------------------------------------------------------------------*/
/*
* Send a command to change the speed of the dongle
* Need to be called with spinlock on.
*/
static void irda_usb_change_speed_xbofs(struct irda_usb_cb *self)
{
__u8 *frame;
struct urb *urb;
int ret;
IRDA_DEBUG(2, "%s(), speed=%d, xbofs=%d\n", __FUNCTION__,
self->new_speed, self->new_xbofs);
/* Grab the speed URB */
urb = self->speed_urb;
if (urb->status != 0) {
IRDA_WARNING("%s(), URB still in use!\n", __FUNCTION__);
return;
}
/* Allocate the fake frame */
frame = self->speed_buff;
/* Set the new speed and xbofs in this fake frame */
irda_usb_build_header(self, frame, 1);
/* Submit the 0 length IrDA frame to trigger new speed settings */
usb_fill_bulk_urb(urb, self->usbdev,
usb_sndbulkpipe(self->usbdev, self->bulk_out_ep),
frame, IRDA_USB_SPEED_MTU,
speed_bulk_callback, self);
urb->transfer_buffer_length = USB_IRDA_HEADER;
urb->transfer_flags = 0;
/* Irq disabled -> GFP_ATOMIC */
if ((ret = usb_submit_urb(urb, GFP_ATOMIC))) {
IRDA_WARNING("%s(), failed Speed URB\n", __FUNCTION__);
}
}
/*------------------------------------------------------------------*/
/*
* Speed URB callback
* Now, we can only get called for the speed URB.
*/
static void speed_bulk_callback(struct urb *urb, struct pt_regs *regs)
{
struct irda_usb_cb *self = urb->context;
IRDA_DEBUG(2, "%s()\n", __FUNCTION__);
/* We should always have a context */
IRDA_ASSERT(self != NULL, return;);
/* We should always be called for the speed URB */
IRDA_ASSERT(urb == self->speed_urb, return;);
/* Check for timeout and other USB nasties */
if (urb->status != 0) {
/* I get a lot of -ECONNABORTED = -103 here - Jean II */
IRDA_DEBUG(0, "%s(), URB complete status %d, transfer_flags 0x%04X\n", __FUNCTION__, urb->status, urb->transfer_flags);
/* Don't do anything here, that might confuse the USB layer.
* Instead, we will wait for irda_usb_net_timeout(), the
* network layer watchdog, to fix the situation.
* Jean II */
/* A reset of the dongle might be welcomed here - Jean II */
return;
}
/* urb is now available */
//urb->status = 0; -> tested above
/* New speed and xbof is now commited in hardware */
self->new_speed = -1;
self->new_xbofs = -1;
/* Allow the stack to send more packets */
netif_wake_queue(self->netdev);
}
/*------------------------------------------------------------------*/
/*
* Send an IrDA frame to the USB dongle (for transmission)
*/
static int irda_usb_hard_xmit(struct sk_buff *skb, struct net_device *netdev)
{
struct irda_usb_cb *self = netdev->priv;
struct urb *urb = self->tx_urb;
unsigned long flags;
s32 speed;
s16 xbofs;
int res, mtt;
int err = 1; /* Failed */
IRDA_DEBUG(4, "%s() on %s\n", __FUNCTION__, netdev->name);
netif_stop_queue(netdev);
/* Protect us from USB callbacks, net watchdog and else. */
spin_lock_irqsave(&self->lock, flags);
/* Check if the device is still there.
* We need to check self->present under the spinlock because
* of irda_usb_disconnect() is synchronous - Jean II */
if (!self->present) {
IRDA_DEBUG(0, "%s(), Device is gone...\n", __FUNCTION__);
goto drop;
}
/* Check if we need to change the number of xbofs */
xbofs = irda_get_next_xbofs(skb);
if ((xbofs != self->xbofs) && (xbofs != -1)) {
self->new_xbofs = xbofs;
}
/* Check if we need to change the speed */
speed = irda_get_next_speed(skb);
if ((speed != self->speed) && (speed != -1)) {
/* Set the desired speed */
self->new_speed = speed;
/* Check for empty frame */
if (!skb->len) {
/* IrLAP send us an empty frame to make us change the
* speed. Changing speed with the USB adapter is in
* fact sending an empty frame to the adapter, so we
* could just let the present function do its job.
* However, we would wait for min turn time,
* do an extra memcpy and increment packet counters...
* Jean II */
irda_usb_change_speed_xbofs(self);
netdev->trans_start = jiffies;
/* Will netif_wake_queue() in callback */
err = 0; /* No error */
goto drop;
}
}
if (urb->status != 0) {
IRDA_WARNING("%s(), URB still in use!\n", __FUNCTION__);
goto drop;
}
/* Make sure there is room for IrDA-USB header. The actual
* allocation will be done lower in skb_push().
* Also, we don't use directly skb_cow(), because it require
* headroom >= 16, which force unnecessary copies - Jean II */
if (skb_headroom(skb) < USB_IRDA_HEADER) {
IRDA_DEBUG(0, "%s(), Insuficient skb headroom.\n", __FUNCTION__);
if (skb_cow(skb, USB_IRDA_HEADER)) {
IRDA_WARNING("%s(), failed skb_cow() !!!\n", __FUNCTION__);
goto drop;
}
}
/* Change setting for next frame */
irda_usb_build_header(self, skb_push(skb, USB_IRDA_HEADER), 0);
/* FIXME: Make macro out of this one */
((struct irda_skb_cb *)skb->cb)->context = self;
usb_fill_bulk_urb(urb, self->usbdev,
usb_sndbulkpipe(self->usbdev, self->bulk_out_ep),
skb->data, IRDA_SKB_MAX_MTU,
write_bulk_callback, skb);
urb->transfer_buffer_length = skb->len;
/* This flag (URB_ZERO_PACKET) indicates that what we send is not
* a continuous stream of data but separate packets.
* In this case, the USB layer will insert an empty USB frame (TD)
* after each of our packets that is exact multiple of the frame size.
* This is how the dongle will detect the end of packet - Jean II */
urb->transfer_flags = URB_ZERO_PACKET;
/* Generate min turn time. FIXME: can we do better than this? */
/* Trying to a turnaround time at this level is trying to measure
* processor clock cycle with a wrist-watch, approximate at best...
*
* What we know is the last time we received a frame over USB.
* Due to latency over USB that depend on the USB load, we don't
* know when this frame was received over IrDA (a few ms before ?)
* Then, same story for our outgoing frame...
*
* In theory, the USB dongle is supposed to handle the turnaround
* by itself (spec 1.0, chater 4, page 6). Who knows ??? That's
* why this code is enabled only for dongles that doesn't meet
* the spec.
* Jean II */
if (self->capability & IUC_NO_TURN) {
mtt = irda_get_mtt(skb);
if (mtt) {
int diff;
do_gettimeofday(&self->now);
diff = self->now.tv_usec - self->stamp.tv_usec;
#ifdef IU_USB_MIN_RTT
/* Factor in USB delays -> Get rid of udelay() that
* would be lost in the noise - Jean II */
diff += IU_USB_MIN_RTT;
#endif /* IU_USB_MIN_RTT */
/* If the usec counter did wraparound, the diff will
* go negative (tv_usec is a long), so we need to
* correct it by one second. Jean II */
if (diff < 0)
diff += 1000000;
/* Check if the mtt is larger than the time we have
* already used by all the protocol processing
*/
if (mtt > diff) {
mtt -= diff;
if (mtt > 1000)
mdelay(mtt/1000);
else
udelay(mtt);
}
}
}
/* Ask USB to send the packet - Irq disabled -> GFP_ATOMIC */
if ((res = usb_submit_urb(urb, GFP_ATOMIC))) {
IRDA_WARNING("%s(), failed Tx URB\n", __FUNCTION__);
self->stats.tx_errors++;
/* Let USB recover : We will catch that in the watchdog */
/*netif_start_queue(netdev);*/
} else {
/* Increment packet stats */
self->stats.tx_packets++;
self->stats.tx_bytes += skb->len;
netdev->trans_start = jiffies;
}
spin_unlock_irqrestore(&self->lock, flags);
return 0;
drop:
/* Drop silently the skb and exit */
dev_kfree_skb(skb);
spin_unlock_irqrestore(&self->lock, flags);
return err; /* Usually 1 */
}
/*------------------------------------------------------------------*/
/*
* Note : this function will be called only for tx_urb...
*/
static void write_bulk_callback(struct urb *urb, struct pt_regs *regs)
{
unsigned long flags;
struct sk_buff *skb = urb->context;
struct irda_usb_cb *self = ((struct irda_skb_cb *) skb->cb)->context;
IRDA_DEBUG(2, "%s()\n", __FUNCTION__);
/* We should always have a context */
IRDA_ASSERT(self != NULL, return;);
/* We should always be called for the speed URB */
IRDA_ASSERT(urb == self->tx_urb, return;);
/* Free up the skb */
dev_kfree_skb_any(skb);
urb->context = NULL;
/* Check for timeout and other USB nasties */
if (urb->status != 0) {
/* I get a lot of -ECONNABORTED = -103 here - Jean II */
IRDA_DEBUG(0, "%s(), URB complete status %d, transfer_flags 0x%04X\n", __FUNCTION__, urb->status, urb->transfer_flags);
/* Don't do anything here, that might confuse the USB layer,
* and we could go in recursion and blow the kernel stack...
* Instead, we will wait for irda_usb_net_timeout(), the
* network layer watchdog, to fix the situation.
* Jean II */
/* A reset of the dongle might be welcomed here - Jean II */
return;
}
/* urb is now available */
//urb->status = 0; -> tested above
/* Make sure we read self->present properly */
spin_lock_irqsave(&self->lock, flags);
/* If the network is closed, stop everything */
if ((!self->netopen) || (!self->present)) {
IRDA_DEBUG(0, "%s(), Network is gone...\n", __FUNCTION__);
spin_unlock_irqrestore(&self->lock, flags);
return;
}
/* If changes to speed or xbofs is pending... */
if ((self->new_speed != -1) || (self->new_xbofs != -1)) {
if ((self->new_speed != self->speed) ||
(self->new_xbofs != self->xbofs)) {
/* We haven't changed speed yet (because of
* IUC_SPEED_BUG), so do it now - Jean II */
IRDA_DEBUG(1, "%s(), Changing speed now...\n", __FUNCTION__);
irda_usb_change_speed_xbofs(self);
} else {
/* New speed and xbof is now commited in hardware */
self->new_speed = -1;
self->new_xbofs = -1;
/* Done, waiting for next packet */
netif_wake_queue(self->netdev);
}
} else {
/* Otherwise, allow the stack to send more packets */
netif_wake_queue(self->netdev);
}
spin_unlock_irqrestore(&self->lock, flags);
}
/*------------------------------------------------------------------*/
/*
* Watchdog timer from the network layer.
* After a predetermined timeout, if we don't give confirmation that
* the packet has been sent (i.e. no call to netif_wake_queue()),
* the network layer will call this function.
* Note that URB that we submit have also a timeout. When the URB timeout
* expire, the normal URB callback is called (write_bulk_callback()).
*/
static void irda_usb_net_timeout(struct net_device *netdev)
{
unsigned long flags;
struct irda_usb_cb *self = netdev->priv;
struct urb *urb;
int done = 0; /* If we have made any progress */
IRDA_DEBUG(0, "%s(), Network layer thinks we timed out!\n", __FUNCTION__);
IRDA_ASSERT(self != NULL, return;);
/* Protect us from USB callbacks, net Tx and else. */
spin_lock_irqsave(&self->lock, flags);
/* self->present *MUST* be read under spinlock */
if (!self->present) {
IRDA_WARNING("%s(), device not present!\n", __FUNCTION__);
netif_stop_queue(netdev);
spin_unlock_irqrestore(&self->lock, flags);
return;
}
/* Check speed URB */
urb = self->speed_urb;
if (urb->status != 0) {
IRDA_DEBUG(0, "%s: Speed change timed out, urb->status=%d, urb->transfer_flags=0x%04X\n", netdev->name, urb->status, urb->transfer_flags);
switch (urb->status) {
case -EINPROGRESS:
usb_unlink_urb(urb);
/* Note : above will *NOT* call netif_wake_queue()
* in completion handler, we will come back here.
* Jean II */
done = 1;
break;
case -ECONNABORTED: /* -103 */
case -ECONNRESET: /* -104 */
case -ETIMEDOUT: /* -110 */
case -ENOENT: /* -2 (urb unlinked by us) */
default: /* ??? - Play safe */
urb->status = 0;
netif_wake_queue(self->netdev);
done = 1;
break;
}
}
/* Check Tx URB */
urb = self->tx_urb;
if (urb->status != 0) {
struct sk_buff *skb = urb->context;
IRDA_DEBUG(0, "%s: Tx timed out, urb->status=%d, urb->transfer_flags=0x%04X\n", netdev->name, urb->status, urb->transfer_flags);
/* Increase error count */
self->stats.tx_errors++;
#ifdef IU_BUG_KICK_TIMEOUT
/* Can't be a bad idea to reset the speed ;-) - Jean II */
if(self->new_speed == -1)
self->new_speed = self->speed;
if(self->new_xbofs == -1)
self->new_xbofs = self->xbofs;
irda_usb_change_speed_xbofs(self);
#endif /* IU_BUG_KICK_TIMEOUT */
switch (urb->status) {
case -EINPROGRESS:
usb_unlink_urb(urb);
/* Note : above will *NOT* call netif_wake_queue()
* in completion handler, because urb->status will
* be -ENOENT. We will fix that at the next watchdog,
* leaving more time to USB to recover...
* Jean II */
done = 1;
break;
case -ECONNABORTED: /* -103 */
case -ECONNRESET: /* -104 */
case -ETIMEDOUT: /* -110 */
case -ENOENT: /* -2 (urb unlinked by us) */
default: /* ??? - Play safe */
if(skb != NULL) {
dev_kfree_skb_any(skb);
urb->context = NULL;
}
urb->status = 0;
netif_wake_queue(self->netdev);
done = 1;
break;
}
}
spin_unlock_irqrestore(&self->lock, flags);
/* Maybe we need a reset */
/* Note : Some drivers seem to use a usb_set_interface() when they
* need to reset the hardware. Hum...
*/
/* if(done == 0) */
}
/************************* RECEIVE ROUTINES *************************/
/*
* Receive packets from the USB layer stack and pass them to the IrDA stack.
* Try to work around USB failures...
*/
/*
* Note :
* Some of you may have noticed that most dongle have an interrupt in pipe
* that we don't use. Here is the little secret...
* When we hang a Rx URB on the bulk in pipe, it generates some USB traffic
* in every USB frame. This is unnecessary overhead.
* The interrupt in pipe will generate an event every time a packet is
* received. Reading an interrupt pipe adds minimal overhead, but has some
* latency (~1ms).
* If we are connected (speed != 9600), we want to minimise latency, so
* we just always hang the Rx URB and ignore the interrupt.
* If we are not connected (speed == 9600), there is usually no Rx traffic,
* and we want to minimise the USB overhead. In this case we should wait
* on the interrupt pipe and hang the Rx URB only when an interrupt is
* received.
* Jean II
*
* Note : don't read the above as what we are currently doing, but as
* something we could do with KC dongle. Also don't forget that the
* interrupt pipe is not part of the original standard, so this would
* need to be optional...
* Jean II
*/
/*------------------------------------------------------------------*/
/*
* Submit a Rx URB to the USB layer to handle reception of a frame
* Mostly called by the completion callback of the previous URB.
*
* Jean II
*/
static void irda_usb_submit(struct irda_usb_cb *self, struct sk_buff *skb, struct urb *urb)
{
struct irda_skb_cb *cb;
int ret;
IRDA_DEBUG(2, "%s()\n", __FUNCTION__);
/* This should never happen */
IRDA_ASSERT(skb != NULL, return;);
IRDA_ASSERT(urb != NULL, return;);
/* Save ourselves in the skb */
cb = (struct irda_skb_cb *) skb->cb;
cb->context = self;
/* Reinitialize URB */
usb_fill_bulk_urb(urb, self->usbdev,
usb_rcvbulkpipe(self->usbdev, self->bulk_in_ep),
skb->data, IRDA_SKB_MAX_MTU,
irda_usb_receive, skb);
urb->status = 0;
/* Can be called from irda_usb_receive (irq handler) -> GFP_ATOMIC */
ret = usb_submit_urb(urb, GFP_ATOMIC);
if (ret) {
/* If this ever happen, we are in deep s***.
* Basically, the Rx path will stop... */
IRDA_WARNING("%s(), Failed to submit Rx URB %d\n",
__FUNCTION__, ret);
}
}
/*------------------------------------------------------------------*/
/*
* Function irda_usb_receive(urb)
*
* Called by the USB subsystem when a frame has been received
*
*/
static void irda_usb_receive(struct urb *urb, struct pt_regs *regs)
{
struct sk_buff *skb = (struct sk_buff *) urb->context;
struct irda_usb_cb *self;
struct irda_skb_cb *cb;
struct sk_buff *newskb;
struct sk_buff *dataskb;
struct urb *next_urb;
int docopy;
IRDA_DEBUG(2, "%s(), len=%d\n", __FUNCTION__, urb->actual_length);
/* Find ourselves */
cb = (struct irda_skb_cb *) skb->cb;
IRDA_ASSERT(cb != NULL, return;);
self = (struct irda_usb_cb *) cb->context;
IRDA_ASSERT(self != NULL, return;);
/* If the network is closed or the device gone, stop everything */
if ((!self->netopen) || (!self->present)) {
IRDA_DEBUG(0, "%s(), Network is gone!\n", __FUNCTION__);
/* Don't re-submit the URB : will stall the Rx path */
return;
}
/* Check the status */
if (urb->status != 0) {
switch (urb->status) {
case -EILSEQ:
self->stats.rx_crc_errors++;
/* Also precursor to a hot-unplug on UHCI. */
/* Fallthrough... */
case -ECONNRESET: /* -104 */
/* Random error, if I remember correctly */
/* uhci_cleanup_unlink() is going to kill the Rx
* URB just after we return. No problem, at this
* point the URB will be idle ;-) - Jean II */
case -ESHUTDOWN: /* -108 */
/* That's usually a hot-unplug. Submit will fail... */
case -ETIMEDOUT: /* -110 */
/* Usually precursor to a hot-unplug on OHCI. */
default:
self->stats.rx_errors++;
IRDA_DEBUG(0, "%s(), RX status %d, transfer_flags 0x%04X \n", __FUNCTION__, urb->status, urb->transfer_flags);
break;
}
/* If we received an error, we don't want to resubmit the
* Rx URB straight away but to give the USB layer a little
* bit of breathing room.
* We are in the USB thread context, therefore there is a
* danger of recursion (new URB we submit fails, we come
* back here).
* With recent USB stack (2.6.15+), I'm seeing that on
* hot unplug of the dongle...
* Lowest effective timer is 10ms...
* Jean II */
self->rx_defer_timer.function = &irda_usb_rx_defer_expired;
self->rx_defer_timer.data = (unsigned long) urb;
mod_timer(&self->rx_defer_timer, jiffies + (10 * HZ / 1000));
return;
}
/* Check for empty frames */
if (urb->actual_length <= USB_IRDA_HEADER) {
IRDA_WARNING("%s(), empty frame!\n", __FUNCTION__);
goto done;
}
/*
* Remember the time we received this frame, so we can
* reduce the min turn time a bit since we will know
* how much time we have used for protocol processing
*/
do_gettimeofday(&self->stamp);
/* Check if we need to copy the data to a new skb or not.
* For most frames, we use ZeroCopy and pass the already
* allocated skb up the stack.
* If the frame is small, it is more efficient to copy it
* to save memory (copy will be fast anyway - that's
* called Rx-copy-break). Jean II */
docopy = (urb->actual_length < IRDA_RX_COPY_THRESHOLD);
/* Allocate a new skb */
newskb = dev_alloc_skb(docopy ? urb->actual_length : IRDA_SKB_MAX_MTU);
if (!newskb) {
self->stats.rx_dropped++;
/* We could deliver the current skb, but this would stall
* the Rx path. Better drop the packet... Jean II */
goto done;
}
/* Make sure IP header get aligned (IrDA header is 5 bytes) */
/* But IrDA-USB header is 1 byte. Jean II */
//skb_reserve(newskb, USB_IRDA_HEADER - 1);
if(docopy) {
/* Copy packet, so we can recycle the original */
memcpy(newskb->data, skb->data, urb->actual_length);
/* Deliver this new skb */
dataskb = newskb;
/* And hook the old skb to the URB
* Note : we don't need to "clean up" the old skb,
* as we never touched it. Jean II */
} else {
/* We are using ZeroCopy. Deliver old skb */
dataskb = skb;
/* And hook the new skb to the URB */
skb = newskb;
}
/* Set proper length on skb & remove USB-IrDA header */
skb_put(dataskb, urb->actual_length);
skb_pull(dataskb, USB_IRDA_HEADER);
/* Ask the networking layer to queue the packet for the IrDA stack */
dataskb->dev = self->netdev;
dataskb->mac.raw = dataskb->data;
dataskb->protocol = htons(ETH_P_IRDA);
netif_rx(dataskb);
/* Keep stats up to date */
self->stats.rx_bytes += dataskb->len;
self->stats.rx_packets++;
self->netdev->last_rx = jiffies;
done:
/* Note : at this point, the URB we've just received (urb)
* is still referenced by the USB layer. For example, if we
* have received a -ECONNRESET, uhci_cleanup_unlink() will
* continue to process it (in fact, cleaning it up).
* If we were to submit this URB, disaster would ensue.
* Therefore, we submit our idle URB, and put this URB in our
* idle slot....
* Jean II */
/* Note : with this scheme, we could submit the idle URB before
* processing the Rx URB. I don't think it would buy us anything as
* we are running in the USB thread context. Jean II */
next_urb = self->idle_rx_urb;
/* Recycle Rx URB : Now, the idle URB is the present one */
urb->context = NULL;
self->idle_rx_urb = urb;
/* Submit the idle URB to replace the URB we've just received.
* Do it last to avoid race conditions... Jean II */
irda_usb_submit(self, skb, next_urb);
}
/*------------------------------------------------------------------*/
/*
* In case of errors, we want the USB layer to have time to recover.
* Now, it is time to resubmit ouur Rx URB...
*/
static void irda_usb_rx_defer_expired(unsigned long data)
{
struct urb *urb = (struct urb *) data;
struct sk_buff *skb = (struct sk_buff *) urb->context;
struct irda_usb_cb *self;
struct irda_skb_cb *cb;
struct urb *next_urb;
IRDA_DEBUG(2, "%s()\n", __FUNCTION__);
/* Find ourselves */
cb = (struct irda_skb_cb *) skb->cb;
IRDA_ASSERT(cb != NULL, return;);
self = (struct irda_usb_cb *) cb->context;
IRDA_ASSERT(self != NULL, return;);
/* Same stuff as when Rx is done, see above... */
next_urb = self->idle_rx_urb;
urb->context = NULL;
self->idle_rx_urb = urb;
irda_usb_submit(self, skb, next_urb);
}
/*------------------------------------------------------------------*/
/*
* Callbak from IrDA layer. IrDA wants to know if we have
* started receiving anything.
*/
static int irda_usb_is_receiving(struct irda_usb_cb *self)
{
/* Note : because of the way UHCI works, it's almost impossible
* to get this info. The Controller DMA directly to memory and
* signal only when the whole frame is finished. To know if the
* first TD of the URB has been filled or not seems hard work...
*
* The other solution would be to use the "receiving" command
* on the default decriptor with a usb_control_msg(), but that
* would add USB traffic and would return result only in the
* next USB frame (~1ms).
*
* I've been told that current dongles send status info on their
* interrupt endpoint, and that's what the Windows driver uses
* to know this info. Unfortunately, this is not yet in the spec...
*
* Jean II
*/
return 0; /* For now */
}
/********************** IRDA DEVICE CALLBACKS **********************/
/*
* Main calls from the IrDA/Network subsystem.
* Mostly registering a new irda-usb device and removing it....
* We only deal with the IrDA side of the business, the USB side will
* be dealt with below...
*/
/*------------------------------------------------------------------*/
/*
* Function irda_usb_net_open (dev)
*
* Network device is taken up. Usually this is done by "ifconfig irda0 up"
*
* Note : don't mess with self->netopen - Jean II
*/
static int irda_usb_net_open(struct net_device *netdev)
{
struct irda_usb_cb *self;
char hwname[16];
int i;
IRDA_DEBUG(1, "%s()\n", __FUNCTION__);
IRDA_ASSERT(netdev != NULL, return -1;);
self = (struct irda_usb_cb *) netdev->priv;
IRDA_ASSERT(self != NULL, return -1;);
/* Can only open the device if it's there */
if(!self->present) {
IRDA_WARNING("%s(), device not present!\n", __FUNCTION__);
return -1;
}
/* Initialise default speed and xbofs value
* (IrLAP will change that soon) */
self->speed = -1;
self->xbofs = -1;
self->new_speed = -1;
self->new_xbofs = -1;
/* To do *before* submitting Rx urbs and starting net Tx queue
* Jean II */
self->netopen = 1;
/*
* Now that everything should be initialized properly,
* Open new IrLAP layer instance to take care of us...
* Note : will send immediately a speed change...
*/
sprintf(hwname, "usb#%d", self->usbdev->devnum);
self->irlap = irlap_open(netdev, &self->qos, hwname);
IRDA_ASSERT(self->irlap != NULL, return -1;);
/* Allow IrLAP to send data to us */
netif_start_queue(netdev);
/* We submit all the Rx URB except for one that we keep idle.
* Need to be initialised before submitting other USBs, because
* in some cases as soon as we submit the URBs the USB layer
* will trigger a dummy receive - Jean II */
self->idle_rx_urb = self->rx_urb[IU_MAX_ACTIVE_RX_URBS];
self->idle_rx_urb->context = NULL;
/* Now that we can pass data to IrLAP, allow the USB layer
* to send us some data... */
for (i = 0; i < IU_MAX_ACTIVE_RX_URBS; i++) {
struct sk_buff *skb = dev_alloc_skb(IRDA_SKB_MAX_MTU);
if (!skb) {
/* If this ever happen, we are in deep s***.
* Basically, we can't start the Rx path... */
IRDA_WARNING("%s(), Failed to allocate Rx skb\n",
__FUNCTION__);
return -1;
}
//skb_reserve(newskb, USB_IRDA_HEADER - 1);
irda_usb_submit(self, skb, self->rx_urb[i]);
}
/* Ready to play !!! */
return 0;
}
/*------------------------------------------------------------------*/
/*
* Function irda_usb_net_close (self)
*
* Network device is taken down. Usually this is done by
* "ifconfig irda0 down"
*/
static int irda_usb_net_close(struct net_device *netdev)
{
struct irda_usb_cb *self;
int i;
IRDA_DEBUG(1, "%s()\n", __FUNCTION__);
IRDA_ASSERT(netdev != NULL, return -1;);
self = (struct irda_usb_cb *) netdev->priv;
IRDA_ASSERT(self != NULL, return -1;);
/* Clear this flag *before* unlinking the urbs and *before*
* stopping the network Tx queue - Jean II */
self->netopen = 0;
/* Stop network Tx queue */
netif_stop_queue(netdev);
/* Kill defered Rx URB */
del_timer(&self->rx_defer_timer);
/* Deallocate all the Rx path buffers (URBs and skb) */
for (i = 0; i < IU_MAX_RX_URBS; i++) {
struct urb *urb = self->rx_urb[i];
struct sk_buff *skb = (struct sk_buff *) urb->context;
/* Cancel the receive command */
usb_kill_urb(urb);
/* The skb is ours, free it */
if(skb) {
dev_kfree_skb(skb);
urb->context = NULL;
}
}
/* Cancel Tx and speed URB - need to be synchronous to avoid races */
usb_kill_urb(self->tx_urb);
usb_kill_urb(self->speed_urb);
/* Stop and remove instance of IrLAP */
if (self->irlap)
irlap_close(self->irlap);
self->irlap = NULL;
return 0;
}
/*------------------------------------------------------------------*/
/*
* IOCTLs : Extra out-of-band network commands...
*/
static int irda_usb_net_ioctl(struct net_device *dev, struct ifreq *rq, int cmd)
{
unsigned long flags;
struct if_irda_req *irq = (struct if_irda_req *) rq;
struct irda_usb_cb *self;
int ret = 0;
IRDA_ASSERT(dev != NULL, return -1;);
self = dev->priv;
IRDA_ASSERT(self != NULL, return -1;);
IRDA_DEBUG(2, "%s(), %s, (cmd=0x%X)\n", __FUNCTION__, dev->name, cmd);
switch (cmd) {
case SIOCSBANDWIDTH: /* Set bandwidth */
if (!capable(CAP_NET_ADMIN))
return -EPERM;
/* Protect us from USB callbacks, net watchdog and else. */
spin_lock_irqsave(&self->lock, flags);
/* Check if the device is still there */
if(self->present) {
/* Set the desired speed */
self->new_speed = irq->ifr_baudrate;
irda_usb_change_speed_xbofs(self);
}
spin_unlock_irqrestore(&self->lock, flags);
break;
case SIOCSMEDIABUSY: /* Set media busy */
if (!capable(CAP_NET_ADMIN))
return -EPERM;
/* Check if the IrDA stack is still there */
if(self->netopen)
irda_device_set_media_busy(self->netdev, TRUE);
break;
case SIOCGRECEIVING: /* Check if we are receiving right now */
irq->ifr_receiving = irda_usb_is_receiving(self);
break;
default:
ret = -EOPNOTSUPP;
}
return ret;
}
/*------------------------------------------------------------------*/
/*
* Get device stats (for /proc/net/dev and ifconfig)
*/
static struct net_device_stats *irda_usb_net_get_stats(struct net_device *dev)
{
struct irda_usb_cb *self = dev->priv;
return &self->stats;
}
/********************* IRDA CONFIG SUBROUTINES *********************/
/*
* Various subroutines dealing with IrDA and network stuff we use to
* configure and initialise each irda-usb instance.
* These functions are used below in the main calls of the driver...
*/
/*------------------------------------------------------------------*/
/*
* Set proper values in the IrDA QOS structure
*/
static inline void irda_usb_init_qos(struct irda_usb_cb *self)
{
struct irda_class_desc *desc;
IRDA_DEBUG(3, "%s()\n", __FUNCTION__);
desc = self->irda_desc;
/* Initialize QoS for this device */
irda_init_max_qos_capabilies(&self->qos);
/* See spec section 7.2 for meaning.
* Values are little endian (as most USB stuff), the IrDA stack
* use it in native order (see parameters.c). - Jean II */
self->qos.baud_rate.bits = le16_to_cpu(desc->wBaudRate);
self->qos.min_turn_time.bits = desc->bmMinTurnaroundTime;
self->qos.additional_bofs.bits = desc->bmAdditionalBOFs;
self->qos.window_size.bits = desc->bmWindowSize;
self->qos.data_size.bits = desc->bmDataSize;
IRDA_DEBUG(0, "%s(), dongle says speed=0x%X, size=0x%X, window=0x%X, bofs=0x%X, turn=0x%X\n",
__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);
/* Don't always trust what the dongle tell us */
if(self->capability & IUC_SIR_ONLY)
self->qos.baud_rate.bits &= 0x00ff;
if(self->capability & IUC_SMALL_PKT)
self->qos.data_size.bits = 0x07;
if(self->capability & IUC_NO_WINDOW)
self->qos.window_size.bits = 0x01;
if(self->capability & IUC_MAX_WINDOW)
self->qos.window_size.bits = 0x7f;
if(self->capability & IUC_MAX_XBOFS)
self->qos.additional_bofs.bits = 0x01;
#if 1
/* Module parameter can override the rx window size */
if (qos_mtt_bits)
self->qos.min_turn_time.bits = qos_mtt_bits;
#endif
/*
* Note : most of those values apply only for the receive path,
* the transmit path will be set differently - Jean II
*/
irda_qos_bits_to_value(&self->qos);
}
/*------------------------------------------------------------------*/
/*
* Initialise the network side of the irda-usb instance
* Called when a new USB instance is registered in irda_usb_probe()
*/
static inline int irda_usb_open(struct irda_usb_cb *self)
{
struct net_device *netdev = self->netdev;
IRDA_DEBUG(1, "%s()\n", __FUNCTION__);
irda_usb_init_qos(self);
/* Override the network functions we need to use */
netdev->hard_start_xmit = irda_usb_hard_xmit;
netdev->tx_timeout = irda_usb_net_timeout;
netdev->watchdog_timeo = 250*HZ/1000; /* 250 ms > USB timeout */
netdev->open = irda_usb_net_open;
netdev->stop = irda_usb_net_close;
netdev->get_stats = irda_usb_net_get_stats;
netdev->do_ioctl = irda_usb_net_ioctl;
return register_netdev(netdev);
}
/*------------------------------------------------------------------*/
/*
* Cleanup the network side of the irda-usb instance
* Called when a USB instance is removed in irda_usb_disconnect()
*/
static inline void irda_usb_close(struct irda_usb_cb *self)
{
IRDA_DEBUG(1, "%s()\n", __FUNCTION__);
/* Remove netdevice */
unregister_netdev(self->netdev);
/* Remove the speed buffer */
kfree(self->speed_buff);
self->speed_buff = NULL;
}
/********************** USB CONFIG SUBROUTINES **********************/
/*
* Various subroutines dealing with USB stuff we use to configure and
* initialise each irda-usb instance.
* These functions are used below in the main calls of the driver...
*/
/*------------------------------------------------------------------*/
/*
* Function irda_usb_parse_endpoints(dev, ifnum)
*
* Parse the various endpoints and find the one we need.
*
* The endpoint are the pipes used to communicate with the USB device.
* The spec defines 2 endpoints of type bulk transfer, one in, and one out.
* These are used to pass frames back and forth with the dongle.
* Most dongle have also an interrupt endpoint, that will be probably
* documented in the next spec...
*/
static inline int irda_usb_parse_endpoints(struct irda_usb_cb *self, struct usb_host_endpoint *endpoint, int ennum)
{
int i; /* Endpoint index in table */
/* Init : no endpoints */
self->bulk_in_ep = 0;
self->bulk_out_ep = 0;
self->bulk_int_ep = 0;
/* Let's look at all those endpoints */
for(i = 0; i < ennum; i++) {
/* All those variables will get optimised by the compiler,
* so let's aim for clarity... - Jean II */
__u8 ep; /* Endpoint address */
__u8 dir; /* Endpoint direction */
__u8 attr; /* Endpoint attribute */
__u16 psize; /* Endpoint max packet size in bytes */
/* Get endpoint address, direction and attribute */
ep = endpoint[i].desc.bEndpointAddress & USB_ENDPOINT_NUMBER_MASK;
dir = endpoint[i].desc.bEndpointAddress & USB_ENDPOINT_DIR_MASK;
attr = endpoint[i].desc.bmAttributes;
psize = le16_to_cpu(endpoint[i].desc.wMaxPacketSize);
/* Is it a bulk endpoint ??? */
if(attr == USB_ENDPOINT_XFER_BULK) {
/* We need to find an IN and an OUT */
if(dir == USB_DIR_IN) {
/* This is our Rx endpoint */
self->bulk_in_ep = ep;
} else {
/* This is our Tx endpoint */
self->bulk_out_ep = ep;
self->bulk_out_mtu = psize;
}
} else {
if((attr == USB_ENDPOINT_XFER_INT) &&
(dir == USB_DIR_IN)) {
/* This is our interrupt endpoint */
self->bulk_int_ep = ep;
} else {
IRDA_ERROR("%s(), Unrecognised endpoint %02X.\n", __FUNCTION__, ep);
}
}
}
IRDA_DEBUG(0, "%s(), And our endpoints are : in=%02X, out=%02X (%d), int=%02X\n",
__FUNCTION__, self->bulk_in_ep, self->bulk_out_ep, self->bulk_out_mtu, self->bulk_int_ep);
/* Should be 8, 16, 32 or 64 bytes */
IRDA_ASSERT(self->bulk_out_mtu == 64, ;);
return((self->bulk_in_ep != 0) && (self->bulk_out_ep != 0));
}
#ifdef IU_DUMP_CLASS_DESC
/*------------------------------------------------------------------*/
/*
* Function usb_irda_dump_class_desc(desc)
*
* Prints out the contents of the IrDA class descriptor
*
*/
static inline void irda_usb_dump_class_desc(struct irda_class_desc *desc)
{
/* Values are little endian */
printk("bLength=%x\n", desc->bLength);
printk("bDescriptorType=%x\n", desc->bDescriptorType);
printk("bcdSpecRevision=%x\n", le16_to_cpu(desc->bcdSpecRevision));
printk("bmDataSize=%x\n", desc->bmDataSize);
printk("bmWindowSize=%x\n", desc->bmWindowSize);
printk("bmMinTurnaroundTime=%d\n", desc->bmMinTurnaroundTime);
printk("wBaudRate=%x\n", le16_to_cpu(desc->wBaudRate));
printk("bmAdditionalBOFs=%x\n", desc->bmAdditionalBOFs);
printk("bIrdaRateSniff=%x\n", desc->bIrdaRateSniff);
printk("bMaxUnicastList=%x\n", desc->bMaxUnicastList);
}
#endif /* IU_DUMP_CLASS_DESC */
/*------------------------------------------------------------------*/
/*
* Function irda_usb_find_class_desc(intf)
*
* Returns instance of IrDA class descriptor, or NULL if not found
*
* The class descriptor is some extra info that IrDA USB devices will
* offer to us, describing their IrDA characteristics. We will use that in
* irda_usb_init_qos()
*/
static inline struct irda_class_desc *irda_usb_find_class_desc(struct usb_interface *intf)
{
struct usb_device *dev = interface_to_usbdev (intf);
struct irda_class_desc *desc;
int ret;
desc = kmalloc(sizeof (*desc), GFP_KERNEL);
if (desc == NULL)
return NULL;
memset(desc, 0, sizeof(*desc));
/* USB-IrDA class spec 1.0:
* 6.1.3: Standard "Get Descriptor" Device Request is not
* appropriate to retrieve class-specific descriptor
* 6.2.5: Class Specific "Get Class Descriptor" Interface Request
* is mandatory and returns the USB-IrDA class descriptor
*/
ret = usb_control_msg(dev, usb_rcvctrlpipe(dev,0),
IU_REQ_GET_CLASS_DESC,
USB_DIR_IN | USB_TYPE_CLASS | USB_RECIP_INTERFACE,
0, intf->altsetting->desc.bInterfaceNumber, desc,
sizeof(*desc), 500);
IRDA_DEBUG(1, "%s(), ret=%d\n", __FUNCTION__, ret);
if (ret < sizeof(*desc)) {
IRDA_WARNING("usb-irda: class_descriptor read %s (%d)\n",
(ret<0) ? "failed" : "too short", ret);
}
else if (desc->bDescriptorType != USB_DT_IRDA) {
IRDA_WARNING("usb-irda: bad class_descriptor type\n");
}
else {
#ifdef IU_DUMP_CLASS_DESC
irda_usb_dump_class_desc(desc);
#endif /* IU_DUMP_CLASS_DESC */
return desc;
}
kfree(desc);
return NULL;
}
/*********************** USB DEVICE CALLBACKS ***********************/
/*
* Main calls from the USB subsystem.
* Mostly registering a new irda-usb device and removing it....
*/
/*------------------------------------------------------------------*/
/*
* This routine is called by the USB subsystem for each new device
* in the system. We need to check if the device is ours, and in
* this case start handling it.
* The USB layer protect us from reentrancy (via BKL), so we don't need
* to spinlock in there... Jean II
*/
static int irda_usb_probe(struct usb_interface *intf,
const struct usb_device_id *id)
{
struct net_device *net;
struct usb_device *dev = interface_to_usbdev(intf);
struct irda_usb_cb *self = NULL;
struct usb_host_interface *interface;
struct irda_class_desc *irda_desc;
int ret = -ENOMEM;
int i; /* Driver instance index / Rx URB index */
/* Note : the probe make sure to call us only for devices that
* matches the list of dongle (top of the file). So, we
* don't need to check if the dongle is really ours.
* Jean II */
IRDA_MESSAGE("IRDA-USB found at address %d, Vendor: %x, Product: %x\n",
dev->devnum, le16_to_cpu(dev->descriptor.idVendor),
le16_to_cpu(dev->descriptor.idProduct));
net = alloc_irdadev(sizeof(*self));
if (!net)
goto err_out;
SET_MODULE_OWNER(net);
SET_NETDEV_DEV(net, &intf->dev);
self = net->priv;
self->netdev = net;
spin_lock_init(&self->lock);
init_timer(&self->rx_defer_timer);
/* Create all of the needed urbs */
for (i = 0; i < IU_MAX_RX_URBS; i++) {
self->rx_urb[i] = usb_alloc_urb(0, GFP_KERNEL);
if (!self->rx_urb[i]) {
goto err_out_1;
}
}
self->tx_urb = usb_alloc_urb(0, GFP_KERNEL);
if (!self->tx_urb) {
goto err_out_1;
}
self->speed_urb = usb_alloc_urb(0, GFP_KERNEL);
if (!self->speed_urb) {
goto err_out_2;
}
/* Is this really necessary? (no, except maybe for broken devices) */
if (usb_reset_configuration (dev) < 0) {
err("reset_configuration failed");
ret = -EIO;
goto err_out_3;
}
/* Is this really necessary? */
/* Note : some driver do hardcode the interface number, some others
* specify an alternate, but very few driver do like this.
* Jean II */
ret = usb_set_interface(dev, intf->altsetting->desc.bInterfaceNumber, 0);
IRDA_DEBUG(1, "usb-irda: set interface %d result %d\n", intf->altsetting->desc.bInterfaceNumber, ret);
switch (ret) {
case 0:
break;
case -EPIPE: /* -EPIPE = -32 */
/* Martin Diehl says if we get a -EPIPE we should
* be fine and we don't need to do a usb_clear_halt().
* - Jean II */
IRDA_DEBUG(0, "%s(), Received -EPIPE, ignoring...\n", __FUNCTION__);
break;
default:
IRDA_DEBUG(0, "%s(), Unknown error %d\n", __FUNCTION__, ret);
ret = -EIO;
goto err_out_3;
}
/* Find our endpoints */
interface = intf->cur_altsetting;
if(!irda_usb_parse_endpoints(self, interface->endpoint,
interface->desc.bNumEndpoints)) {
IRDA_ERROR("%s(), Bogus endpoints...\n", __FUNCTION__);
ret = -EIO;
goto err_out_3;
}
/* Find IrDA class descriptor */
irda_desc = irda_usb_find_class_desc(intf);
ret = -ENODEV;
if (irda_desc == NULL)
goto err_out_3;
self->irda_desc = irda_desc;
self->present = 1;
self->netopen = 0;
self->capability = id->driver_info;
self->usbdev = dev;
self->usbintf = intf;
/* Allocate the buffer for speed changes */
/* Don't change this buffer size and allocation without doing
* some heavy and complete testing. Don't ask why :-(
* Jean II */
self->speed_buff = (char *) kmalloc(IRDA_USB_SPEED_MTU, GFP_KERNEL);
if (self->speed_buff == NULL)
goto err_out_3;
memset(self->speed_buff, 0, IRDA_USB_SPEED_MTU);
ret = irda_usb_open(self);
if (ret)
goto err_out_4;
IRDA_MESSAGE("IrDA: Registered device %s\n", net->name);
usb_set_intfdata(intf, self);
return 0;
err_out_4:
kfree(self->speed_buff);
err_out_3:
/* Free all urbs that we may have created */
usb_free_urb(self->speed_urb);
err_out_2:
usb_free_urb(self->tx_urb);
err_out_1:
for (i = 0; i < IU_MAX_RX_URBS; i++) {
if (self->rx_urb[i])
usb_free_urb(self->rx_urb[i]);
}
free_netdev(net);
err_out:
return ret;
}
/*------------------------------------------------------------------*/
/*
* The current irda-usb device is removed, the USB layer tell us
* to shut it down...
* One of the constraints is that when we exit this function,
* we cannot use the usb_device no more. Gone. Destroyed. kfree().
* Most other subsystem allow you to destroy the instance at a time
* when it's convenient to you, to postpone it to a later date, but
* not the USB subsystem.
* So, we must make bloody sure that everything gets deactivated.
* Jean II
*/
static void irda_usb_disconnect(struct usb_interface *intf)
{
unsigned long flags;
struct irda_usb_cb *self = usb_get_intfdata(intf);
int i;
IRDA_DEBUG(1, "%s()\n", __FUNCTION__);
usb_set_intfdata(intf, NULL);
if (!self)
return;
/* Make sure that the Tx path is not executing. - Jean II */
spin_lock_irqsave(&self->lock, flags);
/* Oups ! We are not there any more.
* This will stop/desactivate the Tx path. - Jean II */
self->present = 0;
/* Kill defered Rx URB */
del_timer(&self->rx_defer_timer);
/* We need to have irq enabled to unlink the URBs. That's OK,
* at this point the Tx path is gone - Jean II */
spin_unlock_irqrestore(&self->lock, flags);
/* Hum... Check if networking is still active (avoid races) */
if((self->netopen) || (self->irlap)) {
/* Accept no more transmissions */
/*netif_device_detach(self->netdev);*/
netif_stop_queue(self->netdev);
/* Stop all the receive URBs. Must be synchronous. */
for (i = 0; i < IU_MAX_RX_URBS; i++)
usb_kill_urb(self->rx_urb[i]);
/* Cancel Tx and speed URB.
* Make sure it's synchronous to avoid races. */
usb_kill_urb(self->tx_urb);
usb_kill_urb(self->speed_urb);
}
/* Cleanup the device stuff */
irda_usb_close(self);
/* No longer attached to USB bus */
self->usbdev = NULL;
self->usbintf = NULL;
/* Clean up our urbs */
for (i = 0; i < IU_MAX_RX_URBS; i++)
usb_free_urb(self->rx_urb[i]);
/* Clean up Tx and speed URB */
usb_free_urb(self->tx_urb);
usb_free_urb(self->speed_urb);
/* Free self and network device */
free_netdev(self->netdev);
IRDA_DEBUG(0, "%s(), USB IrDA Disconnected\n", __FUNCTION__);
}
/*------------------------------------------------------------------*/
/*
* USB device callbacks
*/
static struct usb_driver irda_driver = {
.name = "irda-usb",
.probe = irda_usb_probe,
.disconnect = irda_usb_disconnect,
.id_table = dongles,
};
/************************* MODULE CALLBACKS *************************/
/*
* Deal with module insertion/removal
* Mostly tell USB about our existence
*/
/*------------------------------------------------------------------*/
/*
* Module insertion
*/
static int __init usb_irda_init(void)
{
int ret;
ret = usb_register(&irda_driver);
if (ret < 0)
return ret;
IRDA_MESSAGE("USB IrDA support registered\n");
return 0;
}
module_init(usb_irda_init);
/*------------------------------------------------------------------*/
/*
* Module removal
*/
static void __exit usb_irda_cleanup(void)
{
/* Deregister the driver and remove all pending instances */
usb_deregister(&irda_driver);
}
module_exit(usb_irda_cleanup);
/*------------------------------------------------------------------*/
/*
* Module parameters
*/
module_param(qos_mtt_bits, int, 0);
MODULE_PARM_DESC(qos_mtt_bits, "Minimum Turn Time");
MODULE_AUTHOR("Roman Weissgaerber <weissg@vienna.at>, Dag Brattli <dag@brattli.net> and Jean Tourrilhes <jt@hpl.hp.com>");
MODULE_DESCRIPTION("IrDA-USB Dongle Driver");
MODULE_LICENSE("GPL");
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