diff options
Diffstat (limited to 'drivers/net/irda/irda-usb.c')
| -rw-r--r-- | drivers/net/irda/irda-usb.c | 1602 |
1 files changed, 1602 insertions, 0 deletions
diff --git a/drivers/net/irda/irda-usb.c b/drivers/net/irda/irda-usb.c new file mode 100644 index 00000000000..46e0022d325 --- /dev/null +++ b/drivers/net/irda/irda-usb.c @@ -0,0 +1,1602 @@ +/***************************************************************************** + * + * 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 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 = URB_ASYNC_UNLINK; + + /* 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; + /* Note : unlink *must* be Asynchronous because of the code in + * irda_usb_net_timeout() -> call in irq - Jean II */ + urb->transfer_flags = URB_ASYNC_UNLINK; + /* 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... + * Also, we are in interrupt, so we need to have + * URB_ASYNC_UNLINK to work properly... + * 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 + */ + +/*------------------------------------------------------------------*/ +/* + * 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, skb->truesize, + irda_usb_receive, skb); + /* Note : unlink *must* be synchronous because of the code in + * irda_usb_net_close() -> free the skb - Jean II */ + 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; + 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_errors++; + self->stats.rx_crc_errors++; + break; + case -ECONNRESET: /* -104 */ + IRDA_DEBUG(0, "%s(), Connection Reset (-104), transfer_flags 0x%04X \n", __FUNCTION__, urb->transfer_flags); + /* 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 */ + break; + default: + IRDA_DEBUG(0, "%s(), RX status %d,transfer_flags 0x%04X \n", __FUNCTION__, urb->status, urb->transfer_flags); + break; + } + goto done; + } + + /* 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. Another time... Jean II */ + + /* Submit the idle URB to replace the URB we've just received */ + irda_usb_submit(self, skb, self->idle_rx_urb); + /* Recycle Rx URB : Now, the idle URB is the present one */ + urb->context = NULL; + self->idle_rx_urb = 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); + + /* 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 */ + self->tx_urb->transfer_flags &= ~URB_ASYNC_UNLINK; + usb_kill_urb(self->tx_urb); + self->speed_urb->transfer_flags &= ~URB_ASYNC_UNLINK; + 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 */ + if (self->speed_buff != NULL) { + 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); + + /* 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; + + /* 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 */ + for (i = 0; i < IU_MAX_RX_URBS; i++) + usb_kill_urb(self->rx_urb[i]); + /* Cancel Tx and speed URB. + * Toggle flags to make sure it's synchronous. */ + self->tx_urb->transfer_flags &= ~URB_ASYNC_UNLINK; + usb_kill_urb(self->tx_urb); + self->speed_urb->transfer_flags &= ~URB_ASYNC_UNLINK; + 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 = { + .owner = THIS_MODULE, + .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"); |