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linux/drivers/net/irda/irda-usb.c
Oliver Neukum 497ba7f4c8 [IRDA]: Race between open and disconnect in irda-usb. 
It seems to me that irda_usb_net_open() must set self->netopen
under spinlock or disconnect() may fail to kill all URBs, if it is called
while an interface is opened.

Signed-off-by: Oliver Neukum <oneukum@suse.de>
Signed-off-by: Samuel Ortiz <samuel@sortiz.org>
Signed-off-by: David S. Miller <davem@davemloft.net>
2007-12-16 14:07:36 -08:00

1924 lines
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/*****************************************************************************
*
* Filename: irda-usb.c
* Version: 0.10
* 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>
* Copyright (C) 2004, SigmaTel, Inc. <irquality@sigmatel.com>
* Copyright (C) 2005, Milan Beno <beno@pobox.sk>
* Copyright (C) 2006, Nick Fedchik <nick@fedchik.org.ua>
*
* 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 <linux/firmware.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 },
/* SigmaTel STIR4210/4220/4116 USB IrDA (VFIR) Bridge */
{ USB_DEVICE(0x66f, 0x4210), .driver_info = IUC_STIR421X | IUC_SPEED_BUG },
{ USB_DEVICE(0x66f, 0x4220), .driver_info = IUC_STIR421X | IUC_SPEED_BUG },
{ USB_DEVICE(0x66f, 0x4116), .driver_info = IUC_STIR421X | IUC_SPEED_BUG },
{ .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 void irda_usb_init_qos(struct irda_usb_cb *self) ;
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);
static void write_bulk_callback(struct urb *urb);
static void irda_usb_receive(struct urb *urb);
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)
{
/* Here we check if we have an STIR421x chip,
* and if either speed or xbofs (or both) needs
* to be changed.
*/
if (self->capability & IUC_STIR421X &&
((self->new_speed != -1) || (self->new_xbofs != -1))) {
/* With STIR421x, speed and xBOFs must be set at the same
* time, even if only one of them changes.
*/
if (self->new_speed == -1)
self->new_speed = self->speed ;
if (self->new_xbofs == -1)
self->new_xbofs = self->xbofs ;
}
/* Set the 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;
case 16000000:
*header = SPEED_16000000;
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;
}
}
}
/*
* calculate turnaround time for SigmaTel header
*/
static __u8 get_turnaround_time(struct sk_buff *skb)
{
int turnaround_time = irda_get_mtt(skb);
if ( turnaround_time == 0 )
return 0;
else if ( turnaround_time <= 10 )
return 1;
else if ( turnaround_time <= 50 )
return 2;
else if ( turnaround_time <= 100 )
return 3;
else if ( turnaround_time <= 500 )
return 4;
else if ( turnaround_time <= 1000 )
return 5;
else if ( turnaround_time <= 5000 )
return 6;
else
return 7;
}
/*------------------------------------------------------------------*/
/*
* 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);
if (self->capability & IUC_STIR421X) {
if (frame[0] == 0) return ; // do nothing if no change
frame[1] = 0; // other parameters don't change here
frame[2] = 0;
}
/* 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 = self->header_length;
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 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;
}
skb_copy_from_linear_data(skb, self->tx_buff + self->header_length, skb->len);
/* Change setting for next frame */
if (self->capability & IUC_STIR421X) {
__u8 turnaround_time;
__u8* frame = self->tx_buff;
turnaround_time = get_turnaround_time( skb );
irda_usb_build_header(self, frame, 0);
frame[2] = turnaround_time;
if ((skb->len != 0) &&
((skb->len % 128) == 0) &&
((skb->len % 512) != 0)) {
/* add extra byte for special SigmaTel feature */
frame[1] = 1;
skb_put(skb, 1);
} else {
frame[1] = 0;
}
} else {
irda_usb_build_header(self, self->tx_buff, 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),
self->tx_buff, skb->len + self->header_length,
write_bulk_callback, skb);
/* 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)
{
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 -ECONNRESET:
case -ENOENT: /* 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 -ECONNRESET:
case -ENOENT: /* 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 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;
unsigned int len, 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:
/* 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:
/* That's usually a hot-unplug. Submit will fail... */
case -ETIME:
/* 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 <= self->header_length) {
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 */
if (self->capability & IUC_STIR421X)
newskb = dev_alloc_skb(docopy ? urb->actual_length :
IRDA_SKB_MAX_MTU +
USB_IRDA_STIR421X_HEADER);
else
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 */
skb_copy_from_linear_data(skb, newskb->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, self->header_length);
/* Ask the networking layer to queue the packet for the IrDA stack */
dataskb->dev = self->netdev;
skb_reset_mac_header(dataskb);
dataskb->protocol = htons(ETH_P_IRDA);
len = dataskb->len;
netif_rx(dataskb);
/* Keep stats up to date */
self->stats.rx_bytes += 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 */
}
#define STIR421X_PATCH_PRODUCT_VER "Product Version: "
#define STIR421X_PATCH_STMP_TAG "STMP"
#define STIR421X_PATCH_CODE_OFFSET 512 /* patch image starts before here */
/* marks end of patch file header (PC DOS text file EOF character) */
#define STIR421X_PATCH_END_OF_HDR_TAG 0x1A
#define STIR421X_PATCH_BLOCK_SIZE 1023
/*
* Function stir421x_fwupload (struct irda_usb_cb *self,
* unsigned char *patch,
* const unsigned int patch_len)
*
* Upload firmware code to SigmaTel 421X IRDA-USB dongle
*/
static int stir421x_fw_upload(struct irda_usb_cb *self,
unsigned char *patch,
const unsigned int patch_len)
{
int ret = -ENOMEM;
int actual_len = 0;
unsigned int i;
unsigned int block_size = 0;
unsigned char *patch_block;
patch_block = kzalloc(STIR421X_PATCH_BLOCK_SIZE, GFP_KERNEL);
if (patch_block == NULL)
return -ENOMEM;
/* break up patch into 1023-byte sections */
for (i = 0; i < patch_len; i += block_size) {
block_size = patch_len - i;
if (block_size > STIR421X_PATCH_BLOCK_SIZE)
block_size = STIR421X_PATCH_BLOCK_SIZE;
/* upload the patch section */
memcpy(patch_block, patch + i, block_size);
ret = usb_bulk_msg(self->usbdev,
usb_sndbulkpipe(self->usbdev,
self->bulk_out_ep),
patch_block, block_size,
&actual_len, msecs_to_jiffies(500));
IRDA_DEBUG(3,"%s(): Bulk send %u bytes, ret=%d\n",
__FUNCTION__, actual_len, ret);
if (ret < 0)
break;
mdelay(10);
}
kfree(patch_block);
return ret;
}
/*
* Function stir421x_patch_device(struct irda_usb_cb *self)
*
* Get a firmware code from userspase using hotplug request_firmware() call
*/
static int stir421x_patch_device(struct irda_usb_cb *self)
{
unsigned int i;
int ret;
char stir421x_fw_name[11];
const struct firmware *fw;
unsigned char *fw_version_ptr; /* pointer to version string */
unsigned long fw_version = 0;
/*
* Known firmware patch file names for STIR421x dongles
* are "42101001.sb" or "42101002.sb"
*/
sprintf(stir421x_fw_name, "4210%4X.sb",
self->usbdev->descriptor.bcdDevice);
ret = request_firmware(&fw, stir421x_fw_name, &self->usbdev->dev);
if (ret < 0)
return ret;
/* We get a patch from userspace */
IRDA_MESSAGE("%s(): Received firmware %s (%zu bytes)\n",
__FUNCTION__, stir421x_fw_name, fw->size);
ret = -EINVAL;
/* Get the bcd product version */
if (!memcmp(fw->data, STIR421X_PATCH_PRODUCT_VER,
sizeof(STIR421X_PATCH_PRODUCT_VER) - 1)) {
fw_version_ptr = fw->data +
sizeof(STIR421X_PATCH_PRODUCT_VER) - 1;
/* Let's check if the product version is dotted */
if (fw_version_ptr[3] == '.' &&
fw_version_ptr[7] == '.') {
unsigned long major, minor, build;
major = simple_strtoul(fw_version_ptr, NULL, 10);
minor = simple_strtoul(fw_version_ptr + 4, NULL, 10);
build = simple_strtoul(fw_version_ptr + 8, NULL, 10);
fw_version = (major << 12)
+ (minor << 8)
+ ((build / 10) << 4)
+ (build % 10);
IRDA_DEBUG(3, "%s(): Firmware Product version %ld\n",
__FUNCTION__, fw_version);
}
}
if (self->usbdev->descriptor.bcdDevice == fw_version) {
/*
* If we're here, we've found a correct patch
* The actual image starts after the "STMP" keyword
* so forward to the firmware header tag
*/
for (i = 0; (fw->data[i] != STIR421X_PATCH_END_OF_HDR_TAG)
&& (i < fw->size); i++) ;
/* here we check for the out of buffer case */
if ((STIR421X_PATCH_END_OF_HDR_TAG == fw->data[i])
&& (i < STIR421X_PATCH_CODE_OFFSET)) {
if (!memcmp(fw->data + i + 1, STIR421X_PATCH_STMP_TAG,
sizeof(STIR421X_PATCH_STMP_TAG) - 1)) {
/* We can upload the patch to the target */
i += sizeof(STIR421X_PATCH_STMP_TAG);
ret = stir421x_fw_upload(self, &fw->data[i],
fw->size - i);
}
}
}
release_firmware(fw);
return ret;
}
/********************** 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;
unsigned long flags;
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;);
spin_lock_irqsave(&self->lock, flags);
/* Can only open the device if it's there */
if(!self->present) {
spin_unlock_irqrestore(&self->lock, flags);
IRDA_WARNING("%s(), device not present!\n", __FUNCTION__);
return -1;
}
if(self->needspatch) {
spin_unlock_irqrestore(&self->lock, flags);
IRDA_WARNING("%s(), device needs patch\n", __FUNCTION__) ;
return -EIO ;
}
/* 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;
spin_unlock_irqrestore(&self->lock, flags);
/*
* 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 < self->max_rx_urb; 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;
kfree(self->tx_buff);
self->tx_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);
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 = kzalloc(sizeof(*desc), GFP_KERNEL);
if (!desc)
return NULL;
/* 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;
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_NETDEV_DEV(net, &intf->dev);
self = net->priv;
self->netdev = net;
spin_lock_init(&self->lock);
init_timer(&self->rx_defer_timer);
self->capability = id->driver_info;
self->needspatch = ((self->capability & IUC_STIR421X) != 0);
/* Create all of the needed urbs */
if (self->capability & IUC_STIR421X) {
self->max_rx_urb = IU_SIGMATEL_MAX_RX_URBS;
self->header_length = USB_IRDA_STIR421X_HEADER;
} else {
self->max_rx_urb = IU_MAX_RX_URBS;
self->header_length = USB_IRDA_HEADER;
}
self->rx_urb = kcalloc(self->max_rx_urb, sizeof(struct urb *),
GFP_KERNEL);
for (i = 0; i < self->max_rx_urb; 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;
}
self->usbdev = dev;
/* Find IrDA class descriptor */
irda_desc = irda_usb_find_class_desc(intf);
ret = -ENODEV;
if (!irda_desc)
goto err_out_3;
if (self->needspatch) {
ret = usb_control_msg (self->usbdev, usb_sndctrlpipe (self->usbdev, 0),
0x02, 0x40, 0, 0, NULL, 0, 500);
if (ret < 0) {
IRDA_DEBUG (0, "usb_control_msg failed %d\n", ret);
goto err_out_3;
} else {
mdelay(10);
}
}
self->irda_desc = irda_desc;
self->present = 1;
self->netopen = 0;
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 = kzalloc(IRDA_USB_SPEED_MTU, GFP_KERNEL);
if (!self->speed_buff)
goto err_out_3;
self->tx_buff = kzalloc(IRDA_SKB_MAX_MTU + self->header_length,
GFP_KERNEL);
if (!self->tx_buff)
goto err_out_4;
ret = irda_usb_open(self);
if (ret)
goto err_out_5;
IRDA_MESSAGE("IrDA: Registered device %s\n", net->name);
usb_set_intfdata(intf, self);
if (self->needspatch) {
/* Now we fetch and upload the firmware patch */
ret = stir421x_patch_device(self);
self->needspatch = (ret < 0);
if (self->needspatch) {
IRDA_ERROR("STIR421X: Couldn't upload patch\n");
goto err_out_6;
}
/* replace IrDA class descriptor with what patched device is now reporting */
irda_desc = irda_usb_find_class_desc (self->usbintf);
if (!irda_desc) {
ret = -ENODEV;
goto err_out_6;
}
kfree(self->irda_desc);
self->irda_desc = irda_desc;
irda_usb_init_qos(self);
}
return 0;
err_out_6:
unregister_netdev(self->netdev);
err_out_5:
kfree(self->tx_buff);
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 < self->max_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 < self->max_rx_urb; 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 < self->max_rx_urb; i++)
usb_free_urb(self->rx_urb[i]);
kfree(self->rx_urb);
/* 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>, Jean Tourrilhes <jt@hpl.hp.com> and Nick Fedchik <nick@fedchik.org.ua>");
MODULE_DESCRIPTION("IrDA-USB Dongle Driver");
MODULE_LICENSE("GPL");
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