drivers/net/irda/irda-usb.c

   1 /*****************************************************************************
   2  *
   3  * Filename:      irda-usb.c
   4  * Version:       0.9b
   5  * Description:   IrDA-USB Driver
   6  * Status:        Experimental
   7  * Author:        Dag Brattli <dag@brattli.net>
   8  *
   9  *      Copyright (C) 2000, Roman Weissgaerber <weissg@vienna.at>
  10  *      Copyright (C) 2001, Dag Brattli <dag@brattli.net>
  11  *      Copyright (C) 2001, Jean Tourrilhes <jt@hpl.hp.com>
  12  *
  13  *      This program is free software; you can redistribute it and/or modify
  14  *      it under the terms of the GNU General Public License as published by
  15  *      the Free Software Foundation; either version 2 of the License, or
  16  *      (at your option) any later version.
  17  *
  18  *      This program is distributed in the hope that it will be useful,
  19  *      but WITHOUT ANY WARRANTY; without even the implied warranty of
  20  *      MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  21  *      GNU General Public License for more details.
  22  *
  23  *      You should have received a copy of the GNU General Public License
  24  *      along with this program; if not, write to the Free Software
  25  *      Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
  26  *
  27  *****************************************************************************/
  28
  29 /*
  30  *                          IMPORTANT NOTE
  31  *                          --------------
  32  *
  33  * As of kernel 2.5.20, this is the state of compliance and testing of
  34  * this driver (irda-usb) with regards to the USB low level drivers...
  35  *
  36  * This driver has been tested SUCCESSFULLY with the following drivers :
  37  *      o usb-uhci-hcd  (For Intel/Via USB controllers)
  38  *      o uhci-hcd      (Alternate/JE driver for Intel/Via USB controllers)
  39  *      o ohci-hcd      (For other USB controllers)
  40  *
  41  * This driver has NOT been tested with the following drivers :
  42  *      o ehci-hcd      (USB 2.0 controllers)
  43  *
  44  * Note that all HCD drivers do URB_ZERO_PACKET and timeout properly,
  45  * so we don't have to worry about that anymore.
  46  * One common problem is the failure to set the address on the dongle,
  47  * but this happens before the driver gets loaded...
  48  *
  49  * Jean II
  50  */
  51
  52 /*------------------------------------------------------------------*/
  53
  54 #include <linux/module.h>
  55 #include <linux/moduleparam.h>
  56 #include <linux/kernel.h>
  57 #include <linux/types.h>
  58 #include <linux/init.h>
  59 #include <linux/skbuff.h>
  60 #include <linux/netdevice.h>
  61 #include <linux/slab.h>
  62 #include <linux/rtnetlink.h>
  63 #include <linux/usb.h>
  64
  65 #include "irda-usb.h"
  66
  67 /*------------------------------------------------------------------*/
  68
  69 static int qos_mtt_bits = 0;
  70
  71 /* These are the currently known IrDA USB dongles. Add new dongles here */
  72 static struct usb_device_id dongles[] = {
  73         /* ACTiSYS Corp.,  ACT-IR2000U FIR-USB Adapter */
  74         { USB_DEVICE(0x9c4, 0x011), .driver_info = IUC_SPEED_BUG | IUC_NO_WINDOW },
  75         /* Look like ACTiSYS, Report : IBM Corp., IBM UltraPort IrDA */
  76         { USB_DEVICE(0x4428, 0x012), .driver_info = IUC_SPEED_BUG | IUC_NO_WINDOW },
  77         /* KC Technology Inc.,  KC-180 USB IrDA Device */
  78         { USB_DEVICE(0x50f, 0x180), .driver_info = IUC_SPEED_BUG | IUC_NO_WINDOW },
  79         /* Extended Systems, Inc.,  XTNDAccess IrDA USB (ESI-9685) */
  80         { USB_DEVICE(0x8e9, 0x100), .driver_info = IUC_SPEED_BUG | IUC_NO_WINDOW },
  81         { .match_flags = USB_DEVICE_ID_MATCH_INT_CLASS |
  82                        USB_DEVICE_ID_MATCH_INT_SUBCLASS,
  83           .bInterfaceClass = USB_CLASS_APP_SPEC,
  84           .bInterfaceSubClass = USB_CLASS_IRDA,
  85           .driver_info = IUC_DEFAULT, },
  86         { }, /* The end */
  87 };
  88
  89 /*
  90  * Important note :
  91  * Devices based on the SigmaTel chipset (0x66f, 0x4200) are not designed
  92  * using the "USB-IrDA specification" (yes, there exist such a thing), and
  93  * therefore not supported by this driver (don't add them above).
  94  * There is a Linux driver, stir4200, that support those USB devices.
  95  * Jean II
  96  */
  97
  98 MODULE_DEVICE_TABLE(usb, dongles);
  99
 100 /*------------------------------------------------------------------*/
 101
 102 static struct irda_class_desc *irda_usb_find_class_desc(struct usb_interface *intf);
 103 static void irda_usb_disconnect(struct usb_interface *intf);
 104 static void irda_usb_change_speed_xbofs(struct irda_usb_cb *self);
 105 static int irda_usb_hard_xmit(struct sk_buff *skb, struct net_device *dev);
 106 static int irda_usb_open(struct irda_usb_cb *self);
 107 static void irda_usb_close(struct irda_usb_cb *self);
 108 static void speed_bulk_callback(struct urb *urb, struct pt_regs *regs);
 109 static void write_bulk_callback(struct urb *urb, struct pt_regs *regs);
 110 static void irda_usb_receive(struct urb *urb, struct pt_regs *regs);
 111 static int irda_usb_net_open(struct net_device *dev);
 112 static int irda_usb_net_close(struct net_device *dev);
 113 static int irda_usb_net_ioctl(struct net_device *dev, struct ifreq *rq, int cmd);
 114 static void irda_usb_net_timeout(struct net_device *dev);
 115 static struct net_device_stats *irda_usb_net_get_stats(struct net_device *dev);
 116
 117 /************************ TRANSMIT ROUTINES ************************/
 118 /*
 119  * Receive packets from the IrDA stack and send them on the USB pipe.
 120  * Handle speed change, timeout and lot's of ugliness...
 121  */
 122
 123 /*------------------------------------------------------------------*/
 124 /*
 125  * Function irda_usb_build_header(self, skb, header)
 126  *
 127  *   Builds USB-IrDA outbound header
 128  *
 129  * When we send an IrDA frame over an USB pipe, we add to it a 1 byte
 130  * header. This function create this header with the proper values.
 131  *
 132  * Important note : the USB-IrDA spec 1.0 say very clearly in chapter 5.4.2.2
 133  * that the setting of the link speed and xbof number in this outbound header
 134  * should be applied *AFTER* the frame has been sent.
 135  * Unfortunately, some devices are not compliant with that... It seems that
 136  * reading the spec is far too difficult...
 137  * Jean II
 138  */
 139 static void irda_usb_build_header(struct irda_usb_cb *self,
 140                                   __u8 *header,
 141                                   int   force)
 142 {
 143         /* Set the negotiated link speed */
 144         if (self->new_speed != -1) {
 145                 /* Hum... Ugly hack :-(
 146                  * Some device are not compliant with the spec and change
 147                  * parameters *before* sending the frame. - Jean II
 148                  */
 149                 if ((self->capability & IUC_SPEED_BUG) &&
 150                     (!force) && (self->speed != -1)) {
 151                         /* No speed and xbofs change here
 152                          * (we'll do it later in the write callback) */
 153                         IRDA_DEBUG(2, "%s(), not changing speed yet\n", __FUNCTION__);
 154                         *header = 0;
 155                         return;
 156                 }
 157
 158                 IRDA_DEBUG(2, "%s(), changing speed to %d\n", __FUNCTION__, self->new_speed);
 159                 self->speed = self->new_speed;
 160                 /* We will do ` self->new_speed = -1; ' in the completion
 161                  * handler just in case the current URB fail - Jean II */
 162
 163                 switch (self->speed) {
 164                 case 2400:
 165                         *header = SPEED_2400;
 166                         break;
 167                 default:
 168                 case 9600:
 169                         *header = SPEED_9600;
 170                         break;
 171                 case 19200:
 172                         *header = SPEED_19200;
 173                         break;
 174                 case 38400:
 175                         *header = SPEED_38400;
 176                         break;
 177                 case 57600:
 178                         *header = SPEED_57600;
 179                         break;
 180                 case 115200:
 181                         *header = SPEED_115200;
 182                         break;
 183                 case 576000:
 184                         *header = SPEED_576000;
 185                         break;
 186                 case 1152000:
 187                         *header = SPEED_1152000;
 188                         break;
 189                 case 4000000:
 190                         *header = SPEED_4000000;
 191                         self->new_xbofs = 0;
 192                         break;
 193                 }
 194         } else
 195                 /* No change */
 196                 *header = 0;
 197
 198         /* Set the negotiated additional XBOFS */
 199         if (self->new_xbofs != -1) {
 200                 IRDA_DEBUG(2, "%s(), changing xbofs to %d\n", __FUNCTION__, self->new_xbofs);
 201                 self->xbofs = self->new_xbofs;
 202                 /* We will do ` self->new_xbofs = -1; ' in the completion
 203                  * handler just in case the current URB fail - Jean II */
 204
 205                 switch (self->xbofs) {
 206                 case 48:
 207                         *header |= 0x10;
 208                         break;
 209                 case 28:
 210                 case 24:        /* USB spec 1.0 says 24 */
 211                         *header |= 0x20;
 212                         break;
 213                 default:
 214                 case 12:
 215                         *header |= 0x30;
 216                         break;
 217                 case 5: /* Bug in IrLAP spec? (should be 6) */
 218                 case 6:
 219                         *header |= 0x40;
 220                         break;
 221                 case 3:
 222                         *header |= 0x50;
 223                         break;
 224                 case 2:
 225                         *header |= 0x60;
 226                         break;
 227                 case 1:
 228                         *header |= 0x70;
 229                         break;
 230                 case 0:
 231                         *header |= 0x80;
 232                         break;
 233                 }
 234         }
 235 }
 236
 237 /*------------------------------------------------------------------*/
 238 /*
 239  * Send a command to change the speed of the dongle
 240  * Need to be called with spinlock on.
 241  */
 242 static void irda_usb_change_speed_xbofs(struct irda_usb_cb *self)
 243 {
 244         __u8 *frame;
 245         struct urb *urb;
 246         int ret;
 247
 248         IRDA_DEBUG(2, "%s(), speed=%d, xbofs=%d\n", __FUNCTION__,
 249                    self->new_speed, self->new_xbofs);
 250
 251         /* Grab the speed URB */
 252         urb = self->speed_urb;
 253         if (urb->status != 0) {
 254                 IRDA_WARNING("%s(), URB still in use!\n", __FUNCTION__);
 255                 return;
 256         }
 257
 258         /* Allocate the fake frame */
 259         frame = self->speed_buff;
 260
 261         /* Set the new speed and xbofs in this fake frame */
 262         irda_usb_build_header(self, frame, 1);
 263
 264         /* Submit the 0 length IrDA frame to trigger new speed settings */
 265         usb_fill_bulk_urb(urb, self->usbdev,
 266                       usb_sndbulkpipe(self->usbdev, self->bulk_out_ep),
 267                       frame, IRDA_USB_SPEED_MTU,
 268                       speed_bulk_callback, self);
 269         urb->transfer_buffer_length = USB_IRDA_HEADER;
 270         urb->transfer_flags = URB_ASYNC_UNLINK;
 271
 272         /* Irq disabled -> GFP_ATOMIC */
 273         if ((ret = usb_submit_urb(urb, GFP_ATOMIC))) {
 274                 IRDA_WARNING("%s(), failed Speed URB\n", __FUNCTION__);
 275         }
 276 }
 277
 278 /*------------------------------------------------------------------*/
 279 /*
 280  * Speed URB callback
 281  * Now, we can only get called for the speed URB.
 282  */
 283 static void speed_bulk_callback(struct urb *urb, struct pt_regs *regs)
 284 {
 285         struct irda_usb_cb *self = urb->context;
 286
 287         IRDA_DEBUG(2, "%s()\n", __FUNCTION__);
 288
 289         /* We should always have a context */
 290         IRDA_ASSERT(self != NULL, return;);
 291         /* We should always be called for the speed URB */
 292         IRDA_ASSERT(urb == self->speed_urb, return;);
 293
 294         /* Check for timeout and other USB nasties */
 295         if (urb->status != 0) {
 296                 /* I get a lot of -ECONNABORTED = -103 here - Jean II */
 297                 IRDA_DEBUG(0, "%s(), URB complete status %d, transfer_flags 0x%04X\n", __FUNCTION__, urb->status, urb->transfer_flags);
 298
 299                 /* Don't do anything here, that might confuse the USB layer.
 300                  * Instead, we will wait for irda_usb_net_timeout(), the
 301                  * network layer watchdog, to fix the situation.
 302                  * Jean II */
 303                 /* A reset of the dongle might be welcomed here - Jean II */
 304                 return;
 305         }
 306
 307         /* urb is now available */
 308         //urb->status = 0; -> tested above
 309
 310         /* New speed and xbof is now commited in hardware */
 311         self->new_speed = -1;
 312         self->new_xbofs = -1;
 313
 314         /* Allow the stack to send more packets */
 315         netif_wake_queue(self->netdev);
 316 }
 317
 318 /*------------------------------------------------------------------*/
 319 /*
 320  * Send an IrDA frame to the USB dongle (for transmission)
 321  */
 322 static int irda_usb_hard_xmit(struct sk_buff *skb, struct net_device *netdev)
 323 {
 324         struct irda_usb_cb *self = netdev->priv;
 325         struct urb *urb = self->tx_urb;
 326         unsigned long flags;
 327         s32 speed;
 328         s16 xbofs;
 329         int res, mtt;
 330         int     err = 1;        /* Failed */
 331
 332         IRDA_DEBUG(4, "%s() on %s\n", __FUNCTION__, netdev->name);
 333
 334         netif_stop_queue(netdev);
 335
 336         /* Protect us from USB callbacks, net watchdog and else. */
 337         spin_lock_irqsave(&self->lock, flags);
 338
 339         /* Check if the device is still there.
 340          * We need to check self->present under the spinlock because
 341          * of irda_usb_disconnect() is synchronous - Jean II */
 342         if (!self->present) {
 343                 IRDA_DEBUG(0, "%s(), Device is gone...\n", __FUNCTION__);
 344                 goto drop;
 345         }
 346
 347         /* Check if we need to change the number of xbofs */
 348         xbofs = irda_get_next_xbofs(skb);
 349         if ((xbofs != self->xbofs) && (xbofs != -1)) {
 350                 self->new_xbofs = xbofs;
 351         }
 352
 353         /* Check if we need to change the speed */
 354         speed = irda_get_next_speed(skb);
 355         if ((speed != self->speed) && (speed != -1)) {
 356                 /* Set the desired speed */
 357                 self->new_speed = speed;
 358
 359                 /* Check for empty frame */
 360                 if (!skb->len) {
 361                         /* IrLAP send us an empty frame to make us change the
 362                          * speed. Changing speed with the USB adapter is in
 363                          * fact sending an empty frame to the adapter, so we
 364                          * could just let the present function do its job.
 365                          * However, we would wait for min turn time,
 366                          * do an extra memcpy and increment packet counters...
 367                          * Jean II */
 368                         irda_usb_change_speed_xbofs(self);
 369                         netdev->trans_start = jiffies;
 370                         /* Will netif_wake_queue() in callback */
 371                         err = 0;        /* No error */
 372                         goto drop;
 373                 }
 374         }
 375
 376         if (urb->status != 0) {
 377                 IRDA_WARNING("%s(), URB still in use!\n", __FUNCTION__);
 378                 goto drop;
 379         }
 380
 381         /* Make sure there is room for IrDA-USB header. The actual
 382          * allocation will be done lower in skb_push().
 383          * Also, we don't use directly skb_cow(), because it require
 384          * headroom >= 16, which force unnecessary copies - Jean II */
 385         if (skb_headroom(skb) < USB_IRDA_HEADER) {
 386                 IRDA_DEBUG(0, "%s(), Insuficient skb headroom.\n", __FUNCTION__);
 387                 if (skb_cow(skb, USB_IRDA_HEADER)) {
 388                         IRDA_WARNING("%s(), failed skb_cow() !!!\n", __FUNCTION__);
 389                         goto drop;
 390                 }
 391         }
 392
 393         /* Change setting for next frame */
 394         irda_usb_build_header(self, skb_push(skb, USB_IRDA_HEADER), 0);
 395
 396         /* FIXME: Make macro out of this one */
 397         ((struct irda_skb_cb *)skb->cb)->context = self;
 398
 399         usb_fill_bulk_urb(urb, self->usbdev,
 400                       usb_sndbulkpipe(self->usbdev, self->bulk_out_ep),
 401                       skb->data, IRDA_SKB_MAX_MTU,
 402                       write_bulk_callback, skb);
 403         urb->transfer_buffer_length = skb->len;
 404         /* Note : unlink *must* be Asynchronous because of the code in
 405          * irda_usb_net_timeout() -> call in irq - Jean II */
 406         urb->transfer_flags = URB_ASYNC_UNLINK;
 407         /* This flag (URB_ZERO_PACKET) indicates that what we send is not
 408          * a continuous stream of data but separate packets.
 409          * In this case, the USB layer will insert an empty USB frame (TD)
 410          * after each of our packets that is exact multiple of the frame size.
 411          * This is how the dongle will detect the end of packet - Jean II */
 412         urb->transfer_flags |= URB_ZERO_PACKET;
 413
 414         /* Generate min turn time. FIXME: can we do better than this? */
 415         /* Trying to a turnaround time at this level is trying to measure
 416          * processor clock cycle with a wrist-watch, approximate at best...
 417          *
 418          * What we know is the last time we received a frame over USB.
 419          * Due to latency over USB that depend on the USB load, we don't
 420          * know when this frame was received over IrDA (a few ms before ?)
 421          * Then, same story for our outgoing frame...
 422          *
 423          * In theory, the USB dongle is supposed to handle the turnaround
 424          * by itself (spec 1.0, chater 4, page 6). Who knows ??? That's
 425          * why this code is enabled only for dongles that doesn't meet
 426          * the spec.
 427          * Jean II */
 428         if (self->capability & IUC_NO_TURN) {
 429                 mtt = irda_get_mtt(skb);
 430                 if (mtt) {
 431                         int diff;
 432                         do_gettimeofday(&self->now);
 433                         diff = self->now.tv_usec - self->stamp.tv_usec;
 434 #ifdef IU_USB_MIN_RTT
 435                         /* Factor in USB delays -> Get rid of udelay() that
 436                          * would be lost in the noise - Jean II */
 437                         diff += IU_USB_MIN_RTT;
 438 #endif /* IU_USB_MIN_RTT */
 439                         /* If the usec counter did wraparound, the diff will
 440                          * go negative (tv_usec is a long), so we need to
 441                          * correct it by one second. Jean II */
 442                         if (diff < 0)
 443                                 diff += 1000000;
 444
 445                         /* Check if the mtt is larger than the time we have
 446                          * already used by all the protocol processing
 447                          */
 448                         if (mtt > diff) {
 449                                 mtt -= diff;
 450                                 if (mtt > 1000)
 451                                         mdelay(mtt/1000);
 452                                 else
 453                                         udelay(mtt);
 454                         }
 455                 }
 456         }
 457
 458         /* Ask USB to send the packet - Irq disabled -> GFP_ATOMIC */
 459         if ((res = usb_submit_urb(urb, GFP_ATOMIC))) {
 460                 IRDA_WARNING("%s(), failed Tx URB\n", __FUNCTION__);
 461                 self->stats.tx_errors++;
 462                 /* Let USB recover : We will catch that in the watchdog */
 463                 /*netif_start_queue(netdev);*/
 464         } else {
 465                 /* Increment packet stats */
 466                 self->stats.tx_packets++;
 467                 self->stats.tx_bytes += skb->len;
 468
 469                 netdev->trans_start = jiffies;
 470         }
 471         spin_unlock_irqrestore(&self->lock, flags);
 472
 473         return 0;
 474
 475 drop:
 476         /* Drop silently the skb and exit */
 477         dev_kfree_skb(skb);
 478         spin_unlock_irqrestore(&self->lock, flags);
 479         return err;             /* Usually 1 */
 480 }
 481
 482 /*------------------------------------------------------------------*/
 483 /*
 484  * Note : this function will be called only for tx_urb...
 485  */
 486 static void write_bulk_callback(struct urb *urb, struct pt_regs *regs)
 487 {
 488         unsigned long flags;
 489         struct sk_buff *skb = urb->context;
 490         struct irda_usb_cb *self = ((struct irda_skb_cb *) skb->cb)->context;
 491
 492         IRDA_DEBUG(2, "%s()\n", __FUNCTION__);
 493
 494         /* We should always have a context */
 495         IRDA_ASSERT(self != NULL, return;);
 496         /* We should always be called for the speed URB */
 497         IRDA_ASSERT(urb == self->tx_urb, return;);
 498
 499         /* Free up the skb */
 500         dev_kfree_skb_any(skb);
 501         urb->context = NULL;
 502
 503         /* Check for timeout and other USB nasties */
 504         if (urb->status != 0) {
 505                 /* I get a lot of -ECONNABORTED = -103 here - Jean II */
 506                 IRDA_DEBUG(0, "%s(), URB complete status %d, transfer_flags 0x%04X\n", __FUNCTION__, urb->status, urb->transfer_flags);
 507
 508                 /* Don't do anything here, that might confuse the USB layer,
 509                  * and we could go in recursion and blow the kernel stack...
 510                  * Instead, we will wait for irda_usb_net_timeout(), the
 511                  * network layer watchdog, to fix the situation.
 512                  * Jean II */
 513                 /* A reset of the dongle might be welcomed here - Jean II */
 514                 return;
 515         }
 516
 517         /* urb is now available */
 518         //urb->status = 0; -> tested above
 519
 520         /* Make sure we read self->present properly */
 521         spin_lock_irqsave(&self->lock, flags);
 522
 523         /* If the network is closed, stop everything */
 524         if ((!self->netopen) || (!self->present)) {
 525                 IRDA_DEBUG(0, "%s(), Network is gone...\n", __FUNCTION__);
 526                 spin_unlock_irqrestore(&self->lock, flags);
 527                 return;
 528         }
 529
 530         /* If changes to speed or xbofs is pending... */
 531         if ((self->new_speed != -1) || (self->new_xbofs != -1)) {
 532                 if ((self->new_speed != self->speed) ||
 533                     (self->new_xbofs != self->xbofs)) {
 534                         /* We haven't changed speed yet (because of
 535                          * IUC_SPEED_BUG), so do it now - Jean II */
 536                         IRDA_DEBUG(1, "%s(), Changing speed now...\n", __FUNCTION__);
 537                         irda_usb_change_speed_xbofs(self);
 538                 } else {
 539                         /* New speed and xbof is now commited in hardware */
 540                         self->new_speed = -1;
 541                         self->new_xbofs = -1;
 542                         /* Done, waiting for next packet */
 543                         netif_wake_queue(self->netdev);
 544                 }
 545         } else {
 546                 /* Otherwise, allow the stack to send more packets */
 547                 netif_wake_queue(self->netdev);
 548         }
 549         spin_unlock_irqrestore(&self->lock, flags);
 550 }
 551
 552 /*------------------------------------------------------------------*/
 553 /*
 554  * Watchdog timer from the network layer.
 555  * After a predetermined timeout, if we don't give confirmation that
 556  * the packet has been sent (i.e. no call to netif_wake_queue()),
 557  * the network layer will call this function.
 558  * Note that URB that we submit have also a timeout. When the URB timeout
 559  * expire, the normal URB callback is called (write_bulk_callback()).
 560  */
 561 static void irda_usb_net_timeout(struct net_device *netdev)
 562 {
 563         unsigned long flags;
 564         struct irda_usb_cb *self = netdev->priv;
 565         struct urb *urb;
 566         int     done = 0;       /* If we have made any progress */
 567
 568         IRDA_DEBUG(0, "%s(), Network layer thinks we timed out!\n", __FUNCTION__);
 569         IRDA_ASSERT(self != NULL, return;);
 570
 571         /* Protect us from USB callbacks, net Tx and else. */
 572         spin_lock_irqsave(&self->lock, flags);
 573
 574         /* self->present *MUST* be read under spinlock */
 575         if (!self->present) {
 576                 IRDA_WARNING("%s(), device not present!\n", __FUNCTION__);
 577                 netif_stop_queue(netdev);
 578                 spin_unlock_irqrestore(&self->lock, flags);
 579                 return;
 580         }
 581
 582         /* Check speed URB */
 583         urb = self->speed_urb;
 584         if (urb->status != 0) {
 585                 IRDA_DEBUG(0, "%s: Speed change timed out, urb->status=%d, urb->transfer_flags=0x%04X\n", netdev->name, urb->status, urb->transfer_flags);
 586
 587                 switch (urb->status) {
 588                 case -EINPROGRESS:
 589                         usb_unlink_urb(urb);
 590                         /* Note : above will  *NOT* call netif_wake_queue()
 591                          * in completion handler, we will come back here.
 592                          * Jean II */
 593                         done = 1;
 594                         break;
 595                 case -ECONNABORTED:             /* -103 */
 596                 case -ECONNRESET:               /* -104 */
 597                 case -ETIMEDOUT:                /* -110 */
 598                 case -ENOENT:                   /* -2 (urb unlinked by us)  */
 599                 default:                        /* ??? - Play safe */
 600                         urb->status = 0;
 601                         netif_wake_queue(self->netdev);
 602                         done = 1;
 603                         break;
 604                 }
 605         }
 606
 607         /* Check Tx URB */
 608         urb = self->tx_urb;
 609         if (urb->status != 0) {
 610                 struct sk_buff *skb = urb->context;
 611
 612                 IRDA_DEBUG(0, "%s: Tx timed out, urb->status=%d, urb->transfer_flags=0x%04X\n", netdev->name, urb->status, urb->transfer_flags);
 613
 614                 /* Increase error count */
 615                 self->stats.tx_errors++;
 616
 617 #ifdef IU_BUG_KICK_TIMEOUT
 618                 /* Can't be a bad idea to reset the speed ;-) - Jean II */
 619                 if(self->new_speed == -1)
 620                         self->new_speed = self->speed;
 621                 if(self->new_xbofs == -1)
 622                         self->new_xbofs = self->xbofs;
 623                 irda_usb_change_speed_xbofs(self);
 624 #endif /* IU_BUG_KICK_TIMEOUT */
 625
 626                 switch (urb->status) {
 627                 case -EINPROGRESS:
 628                         usb_unlink_urb(urb);
 629                         /* Note : above will  *NOT* call netif_wake_queue()
 630                          * in completion handler, because urb->status will
 631                          * be -ENOENT. We will fix that at the next watchdog,
 632                          * leaving more time to USB to recover...
 633                          * Also, we are in interrupt, so we need to have
 634                          * URB_ASYNC_UNLINK to work properly...
 635                          * Jean II */
 636                         done = 1;
 637                         break;
 638                 case -ECONNABORTED:             /* -103 */
 639                 case -ECONNRESET:               /* -104 */
 640                 case -ETIMEDOUT:                /* -110 */
 641                 case -ENOENT:                   /* -2 (urb unlinked by us)  */
 642                 default:                        /* ??? - Play safe */
 643                         if(skb != NULL) {
 644                                 dev_kfree_skb_any(skb);
 645                                 urb->context = NULL;
 646                         }
 647                         urb->status = 0;
 648                         netif_wake_queue(self->netdev);
 649                         done = 1;
 650                         break;
 651                 }
 652         }
 653         spin_unlock_irqrestore(&self->lock, flags);
 654
 655         /* Maybe we need a reset */
 656         /* Note : Some drivers seem to use a usb_set_interface() when they
 657          * need to reset the hardware. Hum...
 658          */
 659
 660         /* if(done == 0) */
 661 }
 662
 663 /************************* RECEIVE ROUTINES *************************/
 664 /*
 665  * Receive packets from the USB layer stack and pass them to the IrDA stack.
 666  * Try to work around USB failures...
 667  */
 668
 669 /*
 670  * Note :
 671  * Some of you may have noticed that most dongle have an interrupt in pipe
 672  * that we don't use. Here is the little secret...
 673  * When we hang a Rx URB on the bulk in pipe, it generates some USB traffic
 674  * in every USB frame. This is unnecessary overhead.
 675  * The interrupt in pipe will generate an event every time a packet is
 676  * received. Reading an interrupt pipe adds minimal overhead, but has some
 677  * latency (~1ms).
 678  * If we are connected (speed != 9600), we want to minimise latency, so
 679  * we just always hang the Rx URB and ignore the interrupt.
 680  * If we are not connected (speed == 9600), there is usually no Rx traffic,
 681  * and we want to minimise the USB overhead. In this case we should wait
 682  * on the interrupt pipe and hang the Rx URB only when an interrupt is
 683  * received.
 684  * Jean II
 685  */
 686
 687 /*------------------------------------------------------------------*/
 688 /*
 689  * Submit a Rx URB to the USB layer to handle reception of a frame
 690  * Mostly called by the completion callback of the previous URB.
 691  *
 692  * Jean II
 693  */
 694 static void irda_usb_submit(struct irda_usb_cb *self, struct sk_buff *skb, struct urb *urb)
 695 {
 696         struct irda_skb_cb *cb;
 697         int ret;
 698
 699         IRDA_DEBUG(2, "%s()\n", __FUNCTION__);
 700
 701         /* This should never happen */
 702         IRDA_ASSERT(skb != NULL, return;);
 703         IRDA_ASSERT(urb != NULL, return;);
 704
 705         /* Save ourselves in the skb */
 706         cb = (struct irda_skb_cb *) skb->cb;
 707         cb->context = self;
 708
 709         /* Reinitialize URB */
 710         usb_fill_bulk_urb(urb, self->usbdev,
 711                       usb_rcvbulkpipe(self->usbdev, self->bulk_in_ep),
 712                       skb->data, skb->truesize,
 713                       irda_usb_receive, skb);
 714         /* Note : unlink *must* be synchronous because of the code in
 715          * irda_usb_net_close() -> free the skb - Jean II */
 716         urb->status = 0;
 717
 718         /* Can be called from irda_usb_receive (irq handler) -> GFP_ATOMIC */
 719         ret = usb_submit_urb(urb, GFP_ATOMIC);
 720         if (ret) {
 721                 /* If this ever happen, we are in deep s***.
 722                  * Basically, the Rx path will stop... */
 723                 IRDA_WARNING("%s(), Failed to submit Rx URB %d\n",
 724                              __FUNCTION__, ret);
 725         }
 726 }
 727
 728 /*------------------------------------------------------------------*/
 729 /*
 730  * Function irda_usb_receive(urb)
 731  *
 732  *     Called by the USB subsystem when a frame has been received
 733  *
 734  */
 735 static void irda_usb_receive(struct urb *urb, struct pt_regs *regs)
 736 {
 737         struct sk_buff *skb = (struct sk_buff *) urb->context;
 738         struct irda_usb_cb *self;
 739         struct irda_skb_cb *cb;
 740         struct sk_buff *newskb;
 741         struct sk_buff *dataskb;
 742         int             docopy;
 743
 744         IRDA_DEBUG(2, "%s(), len=%d\n", __FUNCTION__, urb->actual_length);
 745
 746         /* Find ourselves */
 747         cb = (struct irda_skb_cb *) skb->cb;
 748         IRDA_ASSERT(cb != NULL, return;);
 749         self = (struct irda_usb_cb *) cb->context;
 750         IRDA_ASSERT(self != NULL, return;);
 751
 752         /* If the network is closed or the device gone, stop everything */
 753         if ((!self->netopen) || (!self->present)) {
 754                 IRDA_DEBUG(0, "%s(), Network is gone!\n", __FUNCTION__);
 755                 /* Don't re-submit the URB : will stall the Rx path */
 756                 return;
 757         }
 758
 759         /* Check the status */
 760         if (urb->status != 0) {
 761                 switch (urb->status) {
 762                 case -EILSEQ:
 763                         self->stats.rx_errors++;
 764                         self->stats.rx_crc_errors++;
 765                         break;
 766                 case -ECONNRESET:               /* -104 */
 767                         IRDA_DEBUG(0, "%s(), Connection Reset (-104), transfer_flags 0x%04X \n", __FUNCTION__, urb->transfer_flags);
 768                         /* uhci_cleanup_unlink() is going to kill the Rx
 769                          * URB just after we return. No problem, at this
 770                          * point the URB will be idle ;-) - Jean II */
 771                         break;
 772                 default:
 773                         IRDA_DEBUG(0, "%s(), RX status %d,transfer_flags 0x%04X \n", __FUNCTION__, urb->status, urb->transfer_flags);
 774                         break;
 775                 }
 776                 goto done;
 777         }
 778
 779         /* Check for empty frames */
 780         if (urb->actual_length <= USB_IRDA_HEADER) {
 781                 IRDA_WARNING("%s(), empty frame!\n", __FUNCTION__);
 782                 goto done;
 783         }
 784
 785         /*
 786          * Remember the time we received this frame, so we can
 787          * reduce the min turn time a bit since we will know
 788          * how much time we have used for protocol processing
 789          */
 790         do_gettimeofday(&self->stamp);
 791
 792         /* Check if we need to copy the data to a new skb or not.
 793          * For most frames, we use ZeroCopy and pass the already
 794          * allocated skb up the stack.
 795          * If the frame is small, it is more efficient to copy it
 796          * to save memory (copy will be fast anyway - that's
 797          * called Rx-copy-break). Jean II */
 798         docopy = (urb->actual_length < IRDA_RX_COPY_THRESHOLD);
 799
 800         /* Allocate a new skb */
 801         newskb = dev_alloc_skb(docopy ? urb->actual_length : IRDA_SKB_MAX_MTU);
 802         if (!newskb)  {
 803                 self->stats.rx_dropped++;
 804                 /* We could deliver the current skb, but this would stall
 805                  * the Rx path. Better drop the packet... Jean II */
 806                 goto done;
 807         }
 808
 809         /* Make sure IP header get aligned (IrDA header is 5 bytes) */
 810         /* But IrDA-USB header is 1 byte. Jean II */
 811         //skb_reserve(newskb, USB_IRDA_HEADER - 1);
 812
 813         if(docopy) {
 814                 /* Copy packet, so we can recycle the original */
 815                 memcpy(newskb->data, skb->data, urb->actual_length);
 816                 /* Deliver this new skb */
 817                 dataskb = newskb;
 818                 /* And hook the old skb to the URB
 819                  * Note : we don't need to "clean up" the old skb,
 820                  * as we never touched it. Jean II */
 821         } else {
 822                 /* We are using ZeroCopy. Deliver old skb */
 823                 dataskb = skb;
 824                 /* And hook the new skb to the URB */
 825                 skb = newskb;
 826         }
 827
 828         /* Set proper length on skb & remove USB-IrDA header */
 829         skb_put(dataskb, urb->actual_length);
 830         skb_pull(dataskb, USB_IRDA_HEADER);
 831
 832         /* Ask the networking layer to queue the packet for the IrDA stack */
 833         dataskb->dev = self->netdev;
 834         dataskb->mac.raw  = dataskb->data;
 835         dataskb->protocol = htons(ETH_P_IRDA);
 836         netif_rx(dataskb);
 837
 838         /* Keep stats up to date */
 839         self->stats.rx_bytes += dataskb->len;
 840         self->stats.rx_packets++;
 841         self->netdev->last_rx = jiffies;
 842
 843 done:
 844         /* Note : at this point, the URB we've just received (urb)
 845          * is still referenced by the USB layer. For example, if we
 846          * have received a -ECONNRESET, uhci_cleanup_unlink() will
 847          * continue to process it (in fact, cleaning it up).
 848          * If we were to submit this URB, disaster would ensue.
 849          * Therefore, we submit our idle URB, and put this URB in our
 850          * idle slot....
 851          * Jean II */
 852         /* Note : with this scheme, we could submit the idle URB before
 853          * processing the Rx URB. Another time... Jean II */
 854
 855         /* Submit the idle URB to replace the URB we've just received */
 856         irda_usb_submit(self, skb, self->idle_rx_urb);
 857         /* Recycle Rx URB : Now, the idle URB is the present one */
 858         urb->context = NULL;
 859         self->idle_rx_urb = urb;
 860 }
 861
 862 /*------------------------------------------------------------------*/
 863 /*
 864  * Callbak from IrDA layer. IrDA wants to know if we have
 865  * started receiving anything.
 866  */
 867 static int irda_usb_is_receiving(struct irda_usb_cb *self)
 868 {
 869         /* Note : because of the way UHCI works, it's almost impossible
 870          * to get this info. The Controller DMA directly to memory and
 871          * signal only when the whole frame is finished. To know if the
 872          * first TD of the URB has been filled or not seems hard work...
 873          *
 874          * The other solution would be to use the "receiving" command
 875          * on the default decriptor with a usb_control_msg(), but that
 876          * would add USB traffic and would return result only in the
 877          * next USB frame (~1ms).
 878          *
 879          * I've been told that current dongles send status info on their
 880          * interrupt endpoint, and that's what the Windows driver uses
 881          * to know this info. Unfortunately, this is not yet in the spec...
 882          *
 883          * Jean II
 884          */
 885
 886         return 0; /* For now */
 887 }
 888
 889 /********************** IRDA DEVICE CALLBACKS **********************/
 890 /*
 891  * Main calls from the IrDA/Network subsystem.
 892  * Mostly registering a new irda-usb device and removing it....
 893  * We only deal with the IrDA side of the business, the USB side will
 894  * be dealt with below...
 895  */
 896
 897
 898 /*------------------------------------------------------------------*/
 899 /*
 900  * Function irda_usb_net_open (dev)
 901  *
 902  *    Network device is taken up. Usually this is done by "ifconfig irda0 up"
 903  *
 904  * Note : don't mess with self->netopen - Jean II
 905  */
 906 static int irda_usb_net_open(struct net_device *netdev)
 907 {
 908         struct irda_usb_cb *self;
 909         char    hwname[16];
 910         int i;
 911
 912         IRDA_DEBUG(1, "%s()\n", __FUNCTION__);
 913
 914         IRDA_ASSERT(netdev != NULL, return -1;);
 915         self = (struct irda_usb_cb *) netdev->priv;
 916         IRDA_ASSERT(self != NULL, return -1;);
 917
 918         /* Can only open the device if it's there */
 919         if(!self->present) {
 920                 IRDA_WARNING("%s(), device not present!\n", __FUNCTION__);
 921                 return -1;
 922         }
 923
 924         /* Initialise default speed and xbofs value
 925          * (IrLAP will change that soon) */
 926         self->speed = -1;
 927         self->xbofs = -1;
 928         self->new_speed = -1;
 929         self->new_xbofs = -1;
 930
 931         /* To do *before* submitting Rx urbs and starting net Tx queue
 932          * Jean II */
 933         self->netopen = 1;
 934
 935         /*
 936          * Now that everything should be initialized properly,
 937          * Open new IrLAP layer instance to take care of us...
 938          * Note : will send immediately a speed change...
 939          */
 940         sprintf(hwname, "usb#%d", self->usbdev->devnum);
 941         self->irlap = irlap_open(netdev, &self->qos, hwname);
 942         IRDA_ASSERT(self->irlap != NULL, return -1;);
 943
 944         /* Allow IrLAP to send data to us */
 945         netif_start_queue(netdev);
 946
 947         /* We submit all the Rx URB except for one that we keep idle.
 948          * Need to be initialised before submitting other USBs, because
 949          * in some cases as soon as we submit the URBs the USB layer
 950          * will trigger a dummy receive - Jean II */
 951         self->idle_rx_urb = self->rx_urb[IU_MAX_ACTIVE_RX_URBS];
 952         self->idle_rx_urb->context = NULL;
 953
 954         /* Now that we can pass data to IrLAP, allow the USB layer
 955          * to send us some data... */
 956         for (i = 0; i < IU_MAX_ACTIVE_RX_URBS; i++) {
 957                 struct sk_buff *skb = dev_alloc_skb(IRDA_SKB_MAX_MTU);
 958                 if (!skb) {
 959                         /* If this ever happen, we are in deep s***.
 960                          * Basically, we can't start the Rx path... */
 961                         IRDA_WARNING("%s(), Failed to allocate Rx skb\n",
 962                                      __FUNCTION__);
 963                         return -1;
 964                 }
 965                 //skb_reserve(newskb, USB_IRDA_HEADER - 1);
 966                 irda_usb_submit(self, skb, self->rx_urb[i]);
 967         }
 968
 969         /* Ready to play !!! */
 970         return 0;
 971 }
 972
 973 /*------------------------------------------------------------------*/
 974 /*
 975  * Function irda_usb_net_close (self)
 976  *
 977  *    Network device is taken down. Usually this is done by
 978  *    "ifconfig irda0 down"
 979  */
 980 static int irda_usb_net_close(struct net_device *netdev)
 981 {
 982         struct irda_usb_cb *self;
 983         int     i;
 984
 985         IRDA_DEBUG(1, "%s()\n", __FUNCTION__);
 986
 987         IRDA_ASSERT(netdev != NULL, return -1;);
 988         self = (struct irda_usb_cb *) netdev->priv;
 989         IRDA_ASSERT(self != NULL, return -1;);
 990
 991         /* Clear this flag *before* unlinking the urbs and *before*
 992          * stopping the network Tx queue - Jean II */
 993         self->netopen = 0;
 994
 995         /* Stop network Tx queue */
 996         netif_stop_queue(netdev);
 997
 998         /* Deallocate all the Rx path buffers (URBs and skb) */
 999         for (i = 0; i < IU_MAX_RX_URBS; i++) {
1000                 struct urb *urb = self->rx_urb[i];
1001                 struct sk_buff *skb = (struct sk_buff *) urb->context;
1002                 /* Cancel the receive command */
1003                 usb_kill_urb(urb);
1004                 /* The skb is ours, free it */
1005                 if(skb) {
1006                         dev_kfree_skb(skb);
1007                         urb->context = NULL;
1008                 }
1009         }
1010         /* Cancel Tx and speed URB - need to be synchronous to avoid races */
1011         self->tx_urb->transfer_flags &= ~URB_ASYNC_UNLINK;
1012         usb_kill_urb(self->tx_urb);
1013         self->speed_urb->transfer_flags &= ~URB_ASYNC_UNLINK;
1014         usb_kill_urb(self->speed_urb);
1015
1016         /* Stop and remove instance of IrLAP */
1017         if (self->irlap)
1018                 irlap_close(self->irlap);
1019         self->irlap = NULL;
1020
1021         return 0;
1022 }
1023
1024 /*------------------------------------------------------------------*/
1025 /*
1026  * IOCTLs : Extra out-of-band network commands...
1027  */
1028 static int irda_usb_net_ioctl(struct net_device *dev, struct ifreq *rq, int cmd)
1029 {
1030         unsigned long flags;
1031         struct if_irda_req *irq = (struct if_irda_req *) rq;
1032         struct irda_usb_cb *self;
1033         int ret = 0;
1034
1035         IRDA_ASSERT(dev != NULL, return -1;);
1036         self = dev->priv;
1037         IRDA_ASSERT(self != NULL, return -1;);
1038
1039         IRDA_DEBUG(2, "%s(), %s, (cmd=0x%X)\n", __FUNCTION__, dev->name, cmd);
1040
1041         switch (cmd) {
1042         case SIOCSBANDWIDTH: /* Set bandwidth */
1043                 if (!capable(CAP_NET_ADMIN))
1044                         return -EPERM;
1045                 /* Protect us from USB callbacks, net watchdog and else. */
1046                 spin_lock_irqsave(&self->lock, flags);
1047                 /* Check if the device is still there */
1048                 if(self->present) {
1049                         /* Set the desired speed */
1050                         self->new_speed = irq->ifr_baudrate;
1051                         irda_usb_change_speed_xbofs(self);
1052                 }
1053                 spin_unlock_irqrestore(&self->lock, flags);
1054                 break;
1055         case SIOCSMEDIABUSY: /* Set media busy */
1056                 if (!capable(CAP_NET_ADMIN))
1057                         return -EPERM;
1058                 /* Check if the IrDA stack is still there */
1059                 if(self->netopen)
1060                         irda_device_set_media_busy(self->netdev, TRUE);
1061                 break;
1062         case SIOCGRECEIVING: /* Check if we are receiving right now */
1063                 irq->ifr_receiving = irda_usb_is_receiving(self);
1064                 break;
1065         default:
1066                 ret = -EOPNOTSUPP;
1067         }
1068
1069         return ret;
1070 }
1071
1072 /*------------------------------------------------------------------*/
1073 /*
1074  * Get device stats (for /proc/net/dev and ifconfig)
1075  */
1076 static struct net_device_stats *irda_usb_net_get_stats(struct net_device *dev)
1077 {
1078         struct irda_usb_cb *self = dev->priv;
1079         return &self->stats;
1080 }
1081
1082 /********************* IRDA CONFIG SUBROUTINES *********************/
1083 /*
1084  * Various subroutines dealing with IrDA and network stuff we use to
1085  * configure and initialise each irda-usb instance.
1086  * These functions are used below in the main calls of the driver...
1087  */
1088
1089 /*------------------------------------------------------------------*/
1090 /*
1091  * Set proper values in the IrDA QOS structure
1092  */
1093 static inline void irda_usb_init_qos(struct irda_usb_cb *self)
1094 {
1095         struct irda_class_desc *desc;
1096
1097         IRDA_DEBUG(3, "%s()\n", __FUNCTION__);
1098
1099         desc = self->irda_desc;
1100
1101         /* Initialize QoS for this device */
1102         irda_init_max_qos_capabilies(&self->qos);
1103
1104         /* See spec section 7.2 for meaning.
1105          * Values are little endian (as most USB stuff), the IrDA stack
1106          * use it in native order (see parameters.c). - Jean II */
1107         self->qos.baud_rate.bits       = le16_to_cpu(desc->wBaudRate);
1108         self->qos.min_turn_time.bits   = desc->bmMinTurnaroundTime;
1109         self->qos.additional_bofs.bits = desc->bmAdditionalBOFs;
1110         self->qos.window_size.bits     = desc->bmWindowSize;
1111         self->qos.data_size.bits       = desc->bmDataSize;
1112
1113         IRDA_DEBUG(0, "%s(), dongle says speed=0x%X, size=0x%X, window=0x%X, bofs=0x%X, turn=0x%X\n",
1114                 __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);
1115
1116         /* Don't always trust what the dongle tell us */
1117         if(self->capability & IUC_SIR_ONLY)
1118                 self->qos.baud_rate.bits        &= 0x00ff;
1119         if(self->capability & IUC_SMALL_PKT)
1120                 self->qos.data_size.bits         = 0x07;
1121         if(self->capability & IUC_NO_WINDOW)
1122                 self->qos.window_size.bits       = 0x01;
1123         if(self->capability & IUC_MAX_WINDOW)
1124                 self->qos.window_size.bits       = 0x7f;
1125         if(self->capability & IUC_MAX_XBOFS)
1126                 self->qos.additional_bofs.bits   = 0x01;
1127
1128 #if 1
1129         /* Module parameter can override the rx window size */
1130         if (qos_mtt_bits)
1131                 self->qos.min_turn_time.bits = qos_mtt_bits;
1132 #endif
1133         /*
1134          * Note : most of those values apply only for the receive path,
1135          * the transmit path will be set differently - Jean II
1136          */
1137         irda_qos_bits_to_value(&self->qos);
1138 }
1139
1140 /*------------------------------------------------------------------*/
1141 /*
1142  * Initialise the network side of the irda-usb instance
1143  * Called when a new USB instance is registered in irda_usb_probe()
1144  */
1145 static inline int irda_usb_open(struct irda_usb_cb *self)
1146 {
1147         struct net_device *netdev = self->netdev;
1148
1149         IRDA_DEBUG(1, "%s()\n", __FUNCTION__);
1150
1151         irda_usb_init_qos(self);
1152
1153         /* Override the network functions we need to use */
1154         netdev->hard_start_xmit = irda_usb_hard_xmit;
1155         netdev->tx_timeout      = irda_usb_net_timeout;
1156         netdev->watchdog_timeo  = 250*HZ/1000;  /* 250 ms > USB timeout */
1157         netdev->open            = irda_usb_net_open;
1158         netdev->stop            = irda_usb_net_close;
1159         netdev->get_stats       = irda_usb_net_get_stats;
1160         netdev->do_ioctl        = irda_usb_net_ioctl;
1161
1162         return register_netdev(netdev);
1163 }
1164
1165 /*------------------------------------------------------------------*/
1166 /*
1167  * Cleanup the network side of the irda-usb instance
1168  * Called when a USB instance is removed in irda_usb_disconnect()
1169  */
1170 static inline void irda_usb_close(struct irda_usb_cb *self)
1171 {
1172         IRDA_DEBUG(1, "%s()\n", __FUNCTION__);
1173
1174         /* Remove netdevice */
1175         unregister_netdev(self->netdev);
1176
1177         /* Remove the speed buffer */
1178         if (self->speed_buff != NULL) {
1179                 kfree(self->speed_buff);
1180                 self->speed_buff = NULL;
1181         }
1182 }
1183
1184 /********************** USB CONFIG SUBROUTINES **********************/
1185 /*
1186  * Various subroutines dealing with USB stuff we use to configure and
1187  * initialise each irda-usb instance.
1188  * These functions are used below in the main calls of the driver...
1189  */
1190
1191 /*------------------------------------------------------------------*/
1192 /*
1193  * Function irda_usb_parse_endpoints(dev, ifnum)
1194  *
1195  *    Parse the various endpoints and find the one we need.
1196  *
1197  * The endpoint are the pipes used to communicate with the USB device.
1198  * The spec defines 2 endpoints of type bulk transfer, one in, and one out.
1199  * These are used to pass frames back and forth with the dongle.
1200  * Most dongle have also an interrupt endpoint, that will be probably
1201  * documented in the next spec...
1202  */
1203 static inline int irda_usb_parse_endpoints(struct irda_usb_cb *self, struct usb_host_endpoint *endpoint, int ennum)
1204 {
1205         int i;          /* Endpoint index in table */
1206
1207         /* Init : no endpoints */
1208         self->bulk_in_ep = 0;
1209         self->bulk_out_ep = 0;
1210         self->bulk_int_ep = 0;
1211
1212         /* Let's look at all those endpoints */
1213         for(i = 0; i < ennum; i++) {
1214                 /* All those variables will get optimised by the compiler,
1215                  * so let's aim for clarity... - Jean II */
1216                 __u8 ep;        /* Endpoint address */
1217                 __u8 dir;       /* Endpoint direction */
1218                 __u8 attr;      /* Endpoint attribute */
1219                 __u16 psize;    /* Endpoint max packet size in bytes */
1220
1221                 /* Get endpoint address, direction and attribute */
1222                 ep = endpoint[i].desc.bEndpointAddress & USB_ENDPOINT_NUMBER_MASK;
1223                 dir = endpoint[i].desc.bEndpointAddress & USB_ENDPOINT_DIR_MASK;
1224                 attr = endpoint[i].desc.bmAttributes;
1225                 psize = le16_to_cpu(endpoint[i].desc.wMaxPacketSize);
1226
1227                 /* Is it a bulk endpoint ??? */
1228                 if(attr == USB_ENDPOINT_XFER_BULK) {
1229                         /* We need to find an IN and an OUT */
1230                         if(dir == USB_DIR_IN) {
1231                                 /* This is our Rx endpoint */
1232                                 self->bulk_in_ep = ep;
1233                         } else {
1234                                 /* This is our Tx endpoint */
1235                                 self->bulk_out_ep = ep;
1236                                 self->bulk_out_mtu = psize;
1237                         }
1238                 } else {
1239                         if((attr == USB_ENDPOINT_XFER_INT) &&
1240                            (dir == USB_DIR_IN)) {
1241                                 /* This is our interrupt endpoint */
1242                                 self->bulk_int_ep = ep;
1243                         } else {
1244                                 IRDA_ERROR("%s(), Unrecognised endpoint %02X.\n", __FUNCTION__, ep);
1245                         }
1246                 }
1247         }
1248
1249         IRDA_DEBUG(0, "%s(), And our endpoints are : in=%02X, out=%02X (%d), int=%02X\n",
1250                 __FUNCTION__, self->bulk_in_ep, self->bulk_out_ep, self->bulk_out_mtu, self->bulk_int_ep);
1251         /* Should be 8, 16, 32 or 64 bytes */
1252         IRDA_ASSERT(self->bulk_out_mtu == 64, ;);
1253
1254         return((self->bulk_in_ep != 0) && (self->bulk_out_ep != 0));
1255 }
1256
1257 #ifdef IU_DUMP_CLASS_DESC
1258 /*------------------------------------------------------------------*/
1259 /*
1260  * Function usb_irda_dump_class_desc(desc)
1261  *
1262  *    Prints out the contents of the IrDA class descriptor
1263  *
1264  */
1265 static inline void irda_usb_dump_class_desc(struct irda_class_desc *desc)
1266 {
1267         /* Values are little endian */
1268         printk("bLength=%x\n", desc->bLength);
1269         printk("bDescriptorType=%x\n", desc->bDescriptorType);
1270         printk("bcdSpecRevision=%x\n", le16_to_cpu(desc->bcdSpecRevision));
1271         printk("bmDataSize=%x\n", desc->bmDataSize);
1272         printk("bmWindowSize=%x\n", desc->bmWindowSize);
1273         printk("bmMinTurnaroundTime=%d\n", desc->bmMinTurnaroundTime);
1274         printk("wBaudRate=%x\n", le16_to_cpu(desc->wBaudRate));
1275         printk("bmAdditionalBOFs=%x\n", desc->bmAdditionalBOFs);
1276         printk("bIrdaRateSniff=%x\n", desc->bIrdaRateSniff);
1277         printk("bMaxUnicastList=%x\n", desc->bMaxUnicastList);
1278 }
1279 #endif /* IU_DUMP_CLASS_DESC */
1280
1281 /*------------------------------------------------------------------*/
1282 /*
1283  * Function irda_usb_find_class_desc(intf)
1284  *
1285  *    Returns instance of IrDA class descriptor, or NULL if not found
1286  *
1287  * The class descriptor is some extra info that IrDA USB devices will
1288  * offer to us, describing their IrDA characteristics. We will use that in
1289  * irda_usb_init_qos()
1290  */
1291 static inline struct irda_class_desc *irda_usb_find_class_desc(struct usb_interface *intf)
1292 {
1293         struct usb_device *dev = interface_to_usbdev (intf);
1294         struct irda_class_desc *desc;
1295         int ret;
1296
1297         desc = kmalloc(sizeof (*desc), GFP_KERNEL);
1298         if (desc == NULL)
1299                 return NULL;
1300         memset(desc, 0, sizeof(*desc));
1301
1302         /* USB-IrDA class spec 1.0:
1303          *      6.1.3: Standard "Get Descriptor" Device Request is not
1304          *             appropriate to retrieve class-specific descriptor
1305          *      6.2.5: Class Specific "Get Class Descriptor" Interface Request
1306          *             is mandatory and returns the USB-IrDA class descriptor
1307          */
1308
1309         ret = usb_control_msg(dev, usb_rcvctrlpipe(dev,0),
1310                 IU_REQ_GET_CLASS_DESC,
1311                 USB_DIR_IN | USB_TYPE_CLASS | USB_RECIP_INTERFACE,
1312                 0, intf->altsetting->desc.bInterfaceNumber, desc,
1313                 sizeof(*desc), 500);
1314
1315         IRDA_DEBUG(1, "%s(), ret=%d\n", __FUNCTION__, ret);
1316         if (ret < sizeof(*desc)) {
1317                 IRDA_WARNING("usb-irda: class_descriptor read %s (%d)\n",
1318                              (ret<0) ? "failed" : "too short", ret);
1319         }
1320         else if (desc->bDescriptorType != USB_DT_IRDA) {
1321                 IRDA_WARNING("usb-irda: bad class_descriptor type\n");
1322         }
1323         else {
1324 #ifdef IU_DUMP_CLASS_DESC
1325                 irda_usb_dump_class_desc(desc);
1326 #endif  /* IU_DUMP_CLASS_DESC */
1327
1328                 return desc;
1329         }
1330         kfree(desc);
1331         return NULL;
1332 }
1333
1334 /*********************** USB DEVICE CALLBACKS ***********************/
1335 /*
1336  * Main calls from the USB subsystem.
1337  * Mostly registering a new irda-usb device and removing it....
1338  */
1339
1340 /*------------------------------------------------------------------*/
1341 /*
1342  * This routine is called by the USB subsystem for each new device
1343  * in the system. We need to check if the device is ours, and in
1344  * this case start handling it.
1345  * The USB layer protect us from reentrancy (via BKL), so we don't need
1346  * to spinlock in there... Jean II
1347  */
1348 static int irda_usb_probe(struct usb_interface *intf,
1349                           const struct usb_device_id *id)
1350 {
1351         struct net_device *net;
1352         struct usb_device *dev = interface_to_usbdev(intf);
1353         struct irda_usb_cb *self = NULL;
1354         struct usb_host_interface *interface;
1355         struct irda_class_desc *irda_desc;
1356         int ret = -ENOMEM;
1357         int i;          /* Driver instance index / Rx URB index */
1358
1359         /* Note : the probe make sure to call us only for devices that
1360          * matches the list of dongle (top of the file). So, we
1361          * don't need to check if the dongle is really ours.
1362          * Jean II */
1363
1364         IRDA_MESSAGE("IRDA-USB found at address %d, Vendor: %x, Product: %x\n",
1365                      dev->devnum, le16_to_cpu(dev->descriptor.idVendor),
1366                      le16_to_cpu(dev->descriptor.idProduct));
1367
1368         net = alloc_irdadev(sizeof(*self));
1369         if (!net)
1370                 goto err_out;
1371
1372         SET_MODULE_OWNER(net);
1373         SET_NETDEV_DEV(net, &intf->dev);
1374         self = net->priv;
1375         self->netdev = net;
1376         spin_lock_init(&self->lock);
1377
1378         /* Create all of the needed urbs */
1379         for (i = 0; i < IU_MAX_RX_URBS; i++) {
1380                 self->rx_urb[i] = usb_alloc_urb(0, GFP_KERNEL);
1381                 if (!self->rx_urb[i]) {
1382                         goto err_out_1;
1383                 }
1384         }
1385         self->tx_urb = usb_alloc_urb(0, GFP_KERNEL);
1386         if (!self->tx_urb) {
1387                 goto err_out_1;
1388         }
1389         self->speed_urb = usb_alloc_urb(0, GFP_KERNEL);
1390         if (!self->speed_urb) {
1391                 goto err_out_2;
1392         }
1393
1394         /* Is this really necessary? (no, except maybe for broken devices) */
1395         if (usb_reset_configuration (dev) < 0) {
1396                 err("reset_configuration failed");
1397                 ret = -EIO;
1398                 goto err_out_3;
1399         }
1400
1401         /* Is this really necessary? */
1402         /* Note : some driver do hardcode the interface number, some others
1403          * specify an alternate, but very few driver do like this.
1404          * Jean II */
1405         ret = usb_set_interface(dev, intf->altsetting->desc.bInterfaceNumber, 0);
1406         IRDA_DEBUG(1, "usb-irda: set interface %d result %d\n", intf->altsetting->desc.bInterfaceNumber, ret);
1407         switch (ret) {
1408                 case 0:
1409                         break;
1410                 case -EPIPE:            /* -EPIPE = -32 */
1411                         /* Martin Diehl says if we get a -EPIPE we should
1412                          * be fine and we don't need to do a usb_clear_halt().
1413                          * - Jean II */
1414                         IRDA_DEBUG(0, "%s(), Received -EPIPE, ignoring...\n", __FUNCTION__);
1415                         break;
1416                 default:
1417                         IRDA_DEBUG(0, "%s(), Unknown error %d\n", __FUNCTION__, ret);
1418                         ret = -EIO;
1419                         goto err_out_3;
1420         }
1421
1422         /* Find our endpoints */
1423         interface = intf->cur_altsetting;
1424         if(!irda_usb_parse_endpoints(self, interface->endpoint,
1425                                      interface->desc.bNumEndpoints)) {
1426                 IRDA_ERROR("%s(), Bogus endpoints...\n", __FUNCTION__);
1427                 ret = -EIO;
1428                 goto err_out_3;
1429         }
1430
1431         /* Find IrDA class descriptor */
1432         irda_desc = irda_usb_find_class_desc(intf);
1433         ret = -ENODEV;
1434         if (irda_desc == NULL)
1435                 goto err_out_3;
1436
1437         self->irda_desc =  irda_desc;
1438         self->present = 1;
1439         self->netopen = 0;
1440         self->capability = id->driver_info;
1441         self->usbdev = dev;
1442         self->usbintf = intf;
1443
1444         /* Allocate the buffer for speed changes */
1445         /* Don't change this buffer size and allocation without doing
1446          * some heavy and complete testing. Don't ask why :-(
1447          * Jean II */
1448         self->speed_buff = (char *) kmalloc(IRDA_USB_SPEED_MTU, GFP_KERNEL);
1449         if (self->speed_buff == NULL)
1450                 goto err_out_3;
1451
1452         memset(self->speed_buff, 0, IRDA_USB_SPEED_MTU);
1453
1454         ret = irda_usb_open(self);
1455         if (ret)
1456                 goto err_out_4;
1457
1458         IRDA_MESSAGE("IrDA: Registered device %s\n", net->name);
1459         usb_set_intfdata(intf, self);
1460         return 0;
1461
1462 err_out_4:
1463         kfree(self->speed_buff);
1464 err_out_3:
1465         /* Free all urbs that we may have created */
1466         usb_free_urb(self->speed_urb);
1467 err_out_2:
1468         usb_free_urb(self->tx_urb);
1469 err_out_1:
1470         for (i = 0; i < IU_MAX_RX_URBS; i++) {
1471                 if (self->rx_urb[i])
1472                         usb_free_urb(self->rx_urb[i]);
1473         }
1474         free_netdev(net);
1475 err_out:
1476         return ret;
1477 }
1478
1479 /*------------------------------------------------------------------*/
1480 /*
1481  * The current irda-usb device is removed, the USB layer tell us
1482  * to shut it down...
1483  * One of the constraints is that when we exit this function,
1484  * we cannot use the usb_device no more. Gone. Destroyed. kfree().
1485  * Most other subsystem allow you to destroy the instance at a time
1486  * when it's convenient to you, to postpone it to a later date, but
1487  * not the USB subsystem.
1488  * So, we must make bloody sure that everything gets deactivated.
1489  * Jean II
1490  */
1491 static void irda_usb_disconnect(struct usb_interface *intf)
1492 {
1493         unsigned long flags;
1494         struct irda_usb_cb *self = usb_get_intfdata(intf);
1495         int i;
1496
1497         IRDA_DEBUG(1, "%s()\n", __FUNCTION__);
1498
1499         usb_set_intfdata(intf, NULL);
1500         if (!self)
1501                 return;
1502
1503         /* Make sure that the Tx path is not executing. - Jean II */
1504         spin_lock_irqsave(&self->lock, flags);
1505
1506         /* Oups ! We are not there any more.
1507          * This will stop/desactivate the Tx path. - Jean II */
1508         self->present = 0;
1509
1510         /* We need to have irq enabled to unlink the URBs. That's OK,
1511          * at this point the Tx path is gone - Jean II */
1512         spin_unlock_irqrestore(&self->lock, flags);
1513
1514         /* Hum... Check if networking is still active (avoid races) */
1515         if((self->netopen) || (self->irlap)) {
1516                 /* Accept no more transmissions */
1517                 /*netif_device_detach(self->netdev);*/
1518                 netif_stop_queue(self->netdev);
1519                 /* Stop all the receive URBs */
1520                 for (i = 0; i < IU_MAX_RX_URBS; i++)
1521                         usb_kill_urb(self->rx_urb[i]);
1522                 /* Cancel Tx and speed URB.
1523                  * Toggle flags to make sure it's synchronous. */
1524                 self->tx_urb->transfer_flags &= ~URB_ASYNC_UNLINK;
1525                 usb_kill_urb(self->tx_urb);
1526                 self->speed_urb->transfer_flags &= ~URB_ASYNC_UNLINK;
1527                 usb_kill_urb(self->speed_urb);
1528         }
1529
1530         /* Cleanup the device stuff */
1531         irda_usb_close(self);
1532         /* No longer attached to USB bus */
1533         self->usbdev = NULL;
1534         self->usbintf = NULL;
1535
1536         /* Clean up our urbs */
1537         for (i = 0; i < IU_MAX_RX_URBS; i++)
1538                 usb_free_urb(self->rx_urb[i]);
1539         /* Clean up Tx and speed URB */
1540         usb_free_urb(self->tx_urb);
1541         usb_free_urb(self->speed_urb);
1542
1543         /* Free self and network device */
1544         free_netdev(self->netdev);
1545         IRDA_DEBUG(0, "%s(), USB IrDA Disconnected\n", __FUNCTION__);
1546 }
1547
1548 /*------------------------------------------------------------------*/
1549 /*
1550  * USB device callbacks
1551  */
1552 static struct usb_driver irda_driver = {
1553         .owner          = THIS_MODULE,
1554         .name           = "irda-usb",
1555         .probe          = irda_usb_probe,
1556         .disconnect     = irda_usb_disconnect,
1557         .id_table       = dongles,
1558 };
1559
1560 /************************* MODULE CALLBACKS *************************/
1561 /*
1562  * Deal with module insertion/removal
1563  * Mostly tell USB about our existence
1564  */
1565
1566 /*------------------------------------------------------------------*/
1567 /*
1568  * Module insertion
1569  */
1570 static int __init usb_irda_init(void)
1571 {
1572         int     ret;
1573
1574         ret = usb_register(&irda_driver);
1575         if (ret < 0)
1576                 return ret;
1577
1578         IRDA_MESSAGE("USB IrDA support registered\n");
1579         return 0;
1580 }
1581 module_init(usb_irda_init);
1582
1583 /*------------------------------------------------------------------*/
1584 /*
1585  * Module removal
1586  */
1587 static void __exit usb_irda_cleanup(void)
1588 {
1589         /* Deregister the driver and remove all pending instances */
1590         usb_deregister(&irda_driver);
1591 }
1592 module_exit(usb_irda_cleanup);
1593
1594 /*------------------------------------------------------------------*/
1595 /*
1596  * Module parameters
1597  */
1598 module_param(qos_mtt_bits, int, 0);
1599 MODULE_PARM_DESC(qos_mtt_bits, "Minimum Turn Time");
1600 MODULE_AUTHOR("Roman Weissgaerber <weissg@vienna.at>, Dag Brattli <dag@brattli.net> and Jean Tourrilhes <jt@hpl.hp.com>");
1601 MODULE_DESCRIPTION("IrDA-USB Dongle Driver");
1602 MODULE_LICENSE("GPL");