kernel/drivers/net/irda/ksdazzle-sir.c

   1 /*****************************************************************************
   2 *
   3 * Filename:      ksdazzle.c
   4 * Version:       0.1.2
   5 * Description:   Irda KingSun Dazzle USB Dongle
   6 * Status:        Experimental
   7 * Author:        Alex Villacís Lasso <a_villacis@palosanto.com>
   8 *
   9 *    Based on stir4200, mcs7780, kingsun-sir drivers.
  10 *
  11 *    This program is free software; you can redistribute it and/or modify
  12 *    it under the terms of the GNU General Public License as published by
  13 *    the Free Software Foundation; either version 2 of the License.
  14 *
  15 *    This program is distributed in the hope that it will be useful,
  16 *    but WITHOUT ANY WARRANTY; without even the implied warranty of
  17 *    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  18 *    GNU General Public License for more details.
  19 *
  20 *    You should have received a copy of the GNU General Public License
  21 *    along with this program; if not, write to the Free Software
  22 *    Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
  23 *
  24 *****************************************************************************/
  25
  26 /*
  27  * Following is my most current (2007-07-26) understanding of how the Kingsun
  28  * 07D0:4100 dongle (sometimes known as the MA-660) is supposed to work. This
  29  * information was deduced by examining the USB traffic captured with USBSnoopy
  30  * from the WinXP driver. Feel free to update here as more of the dongle is
  31  * known.
  32  *
  33  * General: This dongle exposes one interface with two interrupt endpoints, one
  34  * IN and one OUT. In this regard, it is similar to what the Kingsun/Donshine
  35  * dongle (07c0:4200) exposes. Traffic is raw and needs to be wrapped and
  36  * unwrapped manually as in stir4200, kingsun-sir, and ks959-sir.
  37  *
  38  * Transmission: To transmit an IrDA frame, it is necessary to wrap it, then
  39  * split it into multiple segments of up to 7 bytes each, and transmit each in
  40  * sequence. It seems that sending a single big block (like kingsun-sir does)
  41  * won't work with this dongle. Each segment needs to be prefixed with a value
  42  * equal to (unsigned char)0xF8 + <number of bytes in segment>, inside a payload
  43  * of exactly 8 bytes. For example, a segment of 1 byte gets prefixed by 0xF9,
  44  * and one of 7 bytes gets prefixed by 0xFF. The bytes at the end of the
  45  * payload, not considered by the prefix, are ignored (set to 0 by this
  46  * implementation).
  47  *
  48  * Reception: To receive data, the driver must poll the dongle regularly (like
  49  * kingsun-sir.c) with interrupt URBs. If data is available, it will be returned
  50  * in payloads from 0 to 8 bytes long. When concatenated, these payloads form
  51  * a raw IrDA stream that needs to be unwrapped as in stir4200 and kingsun-sir
  52  *
  53  * Speed change: To change the speed of the dongle, the driver prepares a
  54  * control URB with the following as a setup packet:
  55  *    bRequestType    USB_DIR_OUT | USB_TYPE_CLASS | USB_RECIP_INTERFACE
  56  *    bRequest        0x09
  57  *    wValue          0x0200
  58  *    wIndex          0x0001
  59  *    wLength         0x0008 (length of the payload)
  60  * The payload is a 8-byte record, apparently identical to the one used in
  61  * drivers/usb/serial/cypress_m8.c to change speed:
  62  *     __u32 baudSpeed;
  63  *    unsigned int dataBits : 2;    // 0 - 5 bits 3 - 8 bits
  64  *    unsigned int : 1;
  65  *    unsigned int stopBits : 1;
  66  *    unsigned int parityEnable : 1;
  67  *    unsigned int parityType : 1;
  68  *    unsigned int : 1;
  69  *    unsigned int reset : 1;
  70  *    unsigned char reserved[3];    // set to 0
  71  *
  72  * For now only SIR speeds have been observed with this dongle. Therefore,
  73  * nothing is known on what changes (if any) must be done to frame wrapping /
  74  * unwrapping for higher than SIR speeds. This driver assumes no change is
  75  * necessary and announces support for all the way to 115200 bps.
  76  */
  77
  78 #include <linux/module.h>
  79 #include <linux/moduleparam.h>
  80 #include <linux/kernel.h>
  81 #include <linux/types.h>
  82 #include <linux/errno.h>
  83 #include <linux/slab.h>
  84 #include <linux/usb.h>
  85 #include <linux/device.h>
  86 #include <linux/crc32.h>
  87
  88 #include <asm/unaligned.h>
  89 #include <asm/byteorder.h>
  90 #include <asm/uaccess.h>
  91
  92 #include <net/irda/irda.h>
  93 #include <net/irda/wrapper.h>
  94 #include <net/irda/crc.h>
  95
  96 #define KSDAZZLE_VENDOR_ID 0x07d0
  97 #define KSDAZZLE_PRODUCT_ID 0x4100
  98
  99 /* These are the currently known USB ids */
 100 static struct usb_device_id dongles[] = {
 101         /* KingSun Co,Ltd  IrDA/USB Bridge */
 102         {USB_DEVICE(KSDAZZLE_VENDOR_ID, KSDAZZLE_PRODUCT_ID)},
 103         {}
 104 };
 105
 106 MODULE_DEVICE_TABLE(usb, dongles);
 107
 108 #define KINGSUN_MTT 0x07
 109 #define KINGSUN_REQ_RECV 0x01
 110 #define KINGSUN_REQ_SEND 0x09
 111
 112 #define KINGSUN_SND_FIFO_SIZE    2048   /* Max packet we can send */
 113 #define KINGSUN_RCV_MAX 2048    /* Max transfer we can receive */
 114
 115 struct ksdazzle_speedparams {
 116         __le32 baudrate;        /* baud rate, little endian */
 117         __u8 flags;
 118         __u8 reserved[3];
 119 } __packed;
 120
 121 #define KS_DATA_5_BITS 0x00
 122 #define KS_DATA_6_BITS 0x01
 123 #define KS_DATA_7_BITS 0x02
 124 #define KS_DATA_8_BITS 0x03
 125
 126 #define KS_STOP_BITS_1 0x00
 127 #define KS_STOP_BITS_2 0x08
 128
 129 #define KS_PAR_DISABLE    0x00
 130 #define KS_PAR_EVEN    0x10
 131 #define KS_PAR_ODD    0x30
 132 #define KS_RESET    0x80
 133
 134 #define KINGSUN_EP_IN                   0
 135 #define KINGSUN_EP_OUT                  1
 136
 137 struct ksdazzle_cb {
 138         struct usb_device *usbdev;      /* init: probe_irda */
 139         struct net_device *netdev;      /* network layer */
 140         struct irlap_cb *irlap; /* The link layer we are binded to */
 141
 142         struct qos_info qos;
 143
 144         struct urb *tx_urb;
 145         __u8 *tx_buf_clear;
 146         unsigned int tx_buf_clear_used;
 147         unsigned int tx_buf_clear_sent;
 148         __u8 tx_payload[8];
 149
 150         struct urb *rx_urb;
 151         __u8 *rx_buf;
 152         iobuff_t rx_unwrap_buff;
 153
 154         struct usb_ctrlrequest *speed_setuprequest;
 155         struct urb *speed_urb;
 156         struct ksdazzle_speedparams speedparams;
 157         unsigned int new_speed;
 158
 159         __u8 ep_in;
 160         __u8 ep_out;
 161
 162         spinlock_t lock;
 163         int receiving;
 164 };
 165
 166 /* Callback transmission routine */
 167 static void ksdazzle_speed_irq(struct urb *urb)
 168 {
 169         /* unlink, shutdown, unplug, other nasties */
 170         if (urb->status != 0)
 171                 dev_err(&urb->dev->dev,
 172                         "ksdazzle_speed_irq: urb asynchronously failed - %d\n",
 173                         urb->status);
 174 }
 175
 176 /* Send a control request to change speed of the dongle */
 177 static int ksdazzle_change_speed(struct ksdazzle_cb *kingsun, unsigned speed)
 178 {
 179         static unsigned int supported_speeds[] = { 2400, 9600, 19200, 38400,
 180                 57600, 115200, 576000, 1152000, 4000000, 0
 181         };
 182         int err;
 183         unsigned int i;
 184
 185         if (kingsun->speed_setuprequest == NULL || kingsun->speed_urb == NULL)
 186                 return -ENOMEM;
 187
 188         /* Check that requested speed is among the supported ones */
 189         for (i = 0; supported_speeds[i] && supported_speeds[i] != speed; i++) ;
 190         if (supported_speeds[i] == 0)
 191                 return -EOPNOTSUPP;
 192
 193         memset(&(kingsun->speedparams), 0, sizeof(struct ksdazzle_speedparams));
 194         kingsun->speedparams.baudrate = cpu_to_le32(speed);
 195         kingsun->speedparams.flags = KS_DATA_8_BITS;
 196
 197         /* speed_setuprequest pre-filled in ksdazzle_probe */
 198         usb_fill_control_urb(kingsun->speed_urb, kingsun->usbdev,
 199                              usb_sndctrlpipe(kingsun->usbdev, 0),
 200                              (unsigned char *)kingsun->speed_setuprequest,
 201                              &(kingsun->speedparams),
 202                              sizeof(struct ksdazzle_speedparams),
 203                              ksdazzle_speed_irq, kingsun);
 204         kingsun->speed_urb->status = 0;
 205         err = usb_submit_urb(kingsun->speed_urb, GFP_ATOMIC);
 206
 207         return err;
 208 }
 209
 210 /* Submit one fragment of an IrDA frame to the dongle */
 211 static void ksdazzle_send_irq(struct urb *urb);
 212 static int ksdazzle_submit_tx_fragment(struct ksdazzle_cb *kingsun)
 213 {
 214         unsigned int wraplen;
 215         int ret;
 216
 217         /* We can send at most 7 bytes of payload at a time */
 218         wraplen = 7;
 219         if (wraplen > kingsun->tx_buf_clear_used)
 220                 wraplen = kingsun->tx_buf_clear_used;
 221
 222         /* Prepare payload prefix with used length */
 223         memset(kingsun->tx_payload, 0, 8);
 224         kingsun->tx_payload[0] = (unsigned char)0xf8 + wraplen;
 225         memcpy(kingsun->tx_payload + 1, kingsun->tx_buf_clear, wraplen);
 226
 227         usb_fill_int_urb(kingsun->tx_urb, kingsun->usbdev,
 228                          usb_sndintpipe(kingsun->usbdev, kingsun->ep_out),
 229                          kingsun->tx_payload, 8, ksdazzle_send_irq, kingsun, 1);
 230         kingsun->tx_urb->status = 0;
 231         ret = usb_submit_urb(kingsun->tx_urb, GFP_ATOMIC);
 232
 233         /* Remember how much data was sent, in order to update at callback */
 234         kingsun->tx_buf_clear_sent = (ret == 0) ? wraplen : 0;
 235         return ret;
 236 }
 237
 238 /* Callback transmission routine */
 239 static void ksdazzle_send_irq(struct urb *urb)
 240 {
 241         struct ksdazzle_cb *kingsun = urb->context;
 242         struct net_device *netdev = kingsun->netdev;
 243         int ret = 0;
 244
 245         /* in process of stopping, just drop data */
 246         if (!netif_running(kingsun->netdev)) {
 247                 dev_err(&kingsun->usbdev->dev,
 248                         "ksdazzle_send_irq: Network not running!\n");
 249                 return;
 250         }
 251
 252         /* unlink, shutdown, unplug, other nasties */
 253         if (urb->status != 0) {
 254                 dev_err(&kingsun->usbdev->dev,
 255                         "ksdazzle_send_irq: urb asynchronously failed - %d\n",
 256                         urb->status);
 257                 return;
 258         }
 259
 260         if (kingsun->tx_buf_clear_used > 0) {
 261                 /* Update data remaining to be sent */
 262                 if (kingsun->tx_buf_clear_sent < kingsun->tx_buf_clear_used) {
 263                         memmove(kingsun->tx_buf_clear,
 264                                 kingsun->tx_buf_clear +
 265                                 kingsun->tx_buf_clear_sent,
 266                                 kingsun->tx_buf_clear_used -
 267                                 kingsun->tx_buf_clear_sent);
 268                 }
 269                 kingsun->tx_buf_clear_used -= kingsun->tx_buf_clear_sent;
 270                 kingsun->tx_buf_clear_sent = 0;
 271
 272                 if (kingsun->tx_buf_clear_used > 0) {
 273                         /* There is more data to be sent */
 274                         if ((ret = ksdazzle_submit_tx_fragment(kingsun)) != 0) {
 275                                 dev_err(&kingsun->usbdev->dev,
 276                                         "ksdazzle_send_irq: failed tx_urb submit: %d\n",
 277                                         ret);
 278                                 switch (ret) {
 279                                 case -ENODEV:
 280                                 case -EPIPE:
 281                                         break;
 282                                 default:
 283                                         netdev->stats.tx_errors++;
 284                                         netif_start_queue(netdev);
 285                                 }
 286                         }
 287                 } else {
 288                         /* All data sent, send next speed && wake network queue */
 289                         if (kingsun->new_speed != -1 &&
 290                             cpu_to_le32(kingsun->new_speed) !=
 291                             kingsun->speedparams.baudrate)
 292                                 ksdazzle_change_speed(kingsun,
 293                                                       kingsun->new_speed);
 294
 295                         netif_wake_queue(netdev);
 296                 }
 297         }
 298 }
 299
 300 /*
 301  * Called from net/core when new frame is available.
 302  */
 303 static netdev_tx_t ksdazzle_hard_xmit(struct sk_buff *skb,
 304                                             struct net_device *netdev)
 305 {
 306         struct ksdazzle_cb *kingsun;
 307         unsigned int wraplen;
 308         int ret = 0;
 309
 310         netif_stop_queue(netdev);
 311
 312         /* the IRDA wrapping routines don't deal with non linear skb */
 313         SKB_LINEAR_ASSERT(skb);
 314
 315         kingsun = netdev_priv(netdev);
 316
 317         spin_lock(&kingsun->lock);
 318         kingsun->new_speed = irda_get_next_speed(skb);
 319
 320         /* Append data to the end of whatever data remains to be transmitted */
 321         wraplen =
 322             async_wrap_skb(skb, kingsun->tx_buf_clear, KINGSUN_SND_FIFO_SIZE);
 323         kingsun->tx_buf_clear_used = wraplen;
 324
 325         if ((ret = ksdazzle_submit_tx_fragment(kingsun)) != 0) {
 326                 dev_err(&kingsun->usbdev->dev,
 327                         "ksdazzle_hard_xmit: failed tx_urb submit: %d\n", ret);
 328                 switch (ret) {
 329                 case -ENODEV:
 330                 case -EPIPE:
 331                         break;
 332                 default:
 333                         netdev->stats.tx_errors++;
 334                         netif_start_queue(netdev);
 335                 }
 336         } else {
 337                 netdev->stats.tx_packets++;
 338                 netdev->stats.tx_bytes += skb->len;
 339
 340         }
 341
 342         dev_kfree_skb(skb);
 343         spin_unlock(&kingsun->lock);
 344
 345         return NETDEV_TX_OK;
 346 }
 347
 348 /* Receive callback function */
 349 static void ksdazzle_rcv_irq(struct urb *urb)
 350 {
 351         struct ksdazzle_cb *kingsun = urb->context;
 352         struct net_device *netdev = kingsun->netdev;
 353
 354         /* in process of stopping, just drop data */
 355         if (!netif_running(netdev)) {
 356                 kingsun->receiving = 0;
 357                 return;
 358         }
 359
 360         /* unlink, shutdown, unplug, other nasties */
 361         if (urb->status != 0) {
 362                 dev_err(&kingsun->usbdev->dev,
 363                         "ksdazzle_rcv_irq: urb asynchronously failed - %d\n",
 364                         urb->status);
 365                 kingsun->receiving = 0;
 366                 return;
 367         }
 368
 369         if (urb->actual_length > 0) {
 370                 __u8 *bytes = urb->transfer_buffer;
 371                 unsigned int i;
 372
 373                 for (i = 0; i < urb->actual_length; i++) {
 374                         async_unwrap_char(netdev, &netdev->stats,
 375                                           &kingsun->rx_unwrap_buff, bytes[i]);
 376                 }
 377                 kingsun->receiving =
 378                     (kingsun->rx_unwrap_buff.state != OUTSIDE_FRAME) ? 1 : 0;
 379         }
 380
 381         /* This urb has already been filled in ksdazzle_net_open. It is assumed that
 382            urb keeps the pointer to the payload buffer.
 383          */
 384         urb->status = 0;
 385         usb_submit_urb(urb, GFP_ATOMIC);
 386 }
 387
 388 /*
 389  * Function ksdazzle_net_open (dev)
 390  *
 391  *    Network device is taken up. Usually this is done by "ifconfig irda0 up"
 392  */
 393 static int ksdazzle_net_open(struct net_device *netdev)
 394 {
 395         struct ksdazzle_cb *kingsun = netdev_priv(netdev);
 396         int err = -ENOMEM;
 397         char hwname[16];
 398
 399         /* At this point, urbs are NULL, and skb is NULL (see ksdazzle_probe) */
 400         kingsun->receiving = 0;
 401
 402         /* Initialize for SIR to copy data directly into skb.  */
 403         kingsun->rx_unwrap_buff.in_frame = FALSE;
 404         kingsun->rx_unwrap_buff.state = OUTSIDE_FRAME;
 405         kingsun->rx_unwrap_buff.truesize = IRDA_SKB_MAX_MTU;
 406         kingsun->rx_unwrap_buff.skb = dev_alloc_skb(IRDA_SKB_MAX_MTU);
 407         if (!kingsun->rx_unwrap_buff.skb)
 408                 goto free_mem;
 409
 410         skb_reserve(kingsun->rx_unwrap_buff.skb, 1);
 411         kingsun->rx_unwrap_buff.head = kingsun->rx_unwrap_buff.skb->data;
 412
 413         kingsun->rx_urb = usb_alloc_urb(0, GFP_KERNEL);
 414         if (!kingsun->rx_urb)
 415                 goto free_mem;
 416
 417         kingsun->tx_urb = usb_alloc_urb(0, GFP_KERNEL);
 418         if (!kingsun->tx_urb)
 419                 goto free_mem;
 420
 421         kingsun->speed_urb = usb_alloc_urb(0, GFP_KERNEL);
 422         if (!kingsun->speed_urb)
 423                 goto free_mem;
 424
 425         /* Initialize speed for dongle */
 426         kingsun->new_speed = 9600;
 427         err = ksdazzle_change_speed(kingsun, 9600);
 428         if (err < 0)
 429                 goto free_mem;
 430
 431         /*
 432          * Now that everything should be initialized properly,
 433          * Open new IrLAP layer instance to take care of us...
 434          */
 435         sprintf(hwname, "usb#%d", kingsun->usbdev->devnum);
 436         kingsun->irlap = irlap_open(netdev, &kingsun->qos, hwname);
 437         if (!kingsun->irlap) {
 438                 err = -ENOMEM;
 439                 dev_err(&kingsun->usbdev->dev, "irlap_open failed\n");
 440                 goto free_mem;
 441         }
 442
 443         /* Start reception. */
 444         usb_fill_int_urb(kingsun->rx_urb, kingsun->usbdev,
 445                          usb_rcvintpipe(kingsun->usbdev, kingsun->ep_in),
 446                          kingsun->rx_buf, KINGSUN_RCV_MAX, ksdazzle_rcv_irq,
 447                          kingsun, 1);
 448         kingsun->rx_urb->status = 0;
 449         err = usb_submit_urb(kingsun->rx_urb, GFP_KERNEL);
 450         if (err) {
 451                 dev_err(&kingsun->usbdev->dev, "first urb-submit failed: %d\n", err);
 452                 goto close_irlap;
 453         }
 454
 455         netif_start_queue(netdev);
 456
 457         /* Situation at this point:
 458            - all work buffers allocated
 459            - urbs allocated and ready to fill
 460            - max rx packet known (in max_rx)
 461            - unwrap state machine initialized, in state outside of any frame
 462            - receive request in progress
 463            - IrLAP layer started, about to hand over packets to send
 464          */
 465
 466         return 0;
 467
 468       close_irlap:
 469         irlap_close(kingsun->irlap);
 470       free_mem:
 471         usb_free_urb(kingsun->speed_urb);
 472         kingsun->speed_urb = NULL;
 473         usb_free_urb(kingsun->tx_urb);
 474         kingsun->tx_urb = NULL;
 475         usb_free_urb(kingsun->rx_urb);
 476         kingsun->rx_urb = NULL;
 477         if (kingsun->rx_unwrap_buff.skb) {
 478                 kfree_skb(kingsun->rx_unwrap_buff.skb);
 479                 kingsun->rx_unwrap_buff.skb = NULL;
 480                 kingsun->rx_unwrap_buff.head = NULL;
 481         }
 482         return err;
 483 }
 484
 485 /*
 486  * Function ksdazzle_net_close (dev)
 487  *
 488  *    Network device is taken down. Usually this is done by
 489  *    "ifconfig irda0 down"
 490  */
 491 static int ksdazzle_net_close(struct net_device *netdev)
 492 {
 493         struct ksdazzle_cb *kingsun = netdev_priv(netdev);
 494
 495         /* Stop transmit processing */
 496         netif_stop_queue(netdev);
 497
 498         /* Mop up receive && transmit urb's */
 499         usb_kill_urb(kingsun->tx_urb);
 500         usb_free_urb(kingsun->tx_urb);
 501         kingsun->tx_urb = NULL;
 502
 503         usb_kill_urb(kingsun->speed_urb);
 504         usb_free_urb(kingsun->speed_urb);
 505         kingsun->speed_urb = NULL;
 506
 507         usb_kill_urb(kingsun->rx_urb);
 508         usb_free_urb(kingsun->rx_urb);
 509         kingsun->rx_urb = NULL;
 510
 511         kfree_skb(kingsun->rx_unwrap_buff.skb);
 512         kingsun->rx_unwrap_buff.skb = NULL;
 513         kingsun->rx_unwrap_buff.head = NULL;
 514         kingsun->rx_unwrap_buff.in_frame = FALSE;
 515         kingsun->rx_unwrap_buff.state = OUTSIDE_FRAME;
 516         kingsun->receiving = 0;
 517
 518         /* Stop and remove instance of IrLAP */
 519         irlap_close(kingsun->irlap);
 520
 521         kingsun->irlap = NULL;
 522
 523         return 0;
 524 }
 525
 526 /*
 527  * IOCTLs : Extra out-of-band network commands...
 528  */
 529 static int ksdazzle_net_ioctl(struct net_device *netdev, struct ifreq *rq,
 530                               int cmd)
 531 {
 532         struct if_irda_req *irq = (struct if_irda_req *)rq;
 533         struct ksdazzle_cb *kingsun = netdev_priv(netdev);
 534         int ret = 0;
 535
 536         switch (cmd) {
 537         case SIOCSBANDWIDTH:    /* Set bandwidth */
 538                 if (!capable(CAP_NET_ADMIN))
 539                         return -EPERM;
 540
 541                 /* Check if the device is still there */
 542                 if (netif_device_present(kingsun->netdev))
 543                         return ksdazzle_change_speed(kingsun,
 544                                                      irq->ifr_baudrate);
 545                 break;
 546
 547         case SIOCSMEDIABUSY:    /* Set media busy */
 548                 if (!capable(CAP_NET_ADMIN))
 549                         return -EPERM;
 550
 551                 /* Check if the IrDA stack is still there */
 552                 if (netif_running(kingsun->netdev))
 553                         irda_device_set_media_busy(kingsun->netdev, TRUE);
 554                 break;
 555
 556         case SIOCGRECEIVING:
 557                 /* Only approximately true */
 558                 irq->ifr_receiving = kingsun->receiving;
 559                 break;
 560
 561         default:
 562                 ret = -EOPNOTSUPP;
 563         }
 564
 565         return ret;
 566 }
 567
 568 static const struct net_device_ops ksdazzle_ops = {
 569         .ndo_start_xmit = ksdazzle_hard_xmit,
 570         .ndo_open       = ksdazzle_net_open,
 571         .ndo_stop       = ksdazzle_net_close,
 572         .ndo_do_ioctl   = ksdazzle_net_ioctl,
 573 };
 574
 575 /*
 576  * This routine is called by the USB subsystem for each new device
 577  * in the system. We need to check if the device is ours, and in
 578  * this case start handling it.
 579  */
 580 static int ksdazzle_probe(struct usb_interface *intf,
 581                           const struct usb_device_id *id)
 582 {
 583         struct usb_host_interface *interface;
 584         struct usb_endpoint_descriptor *endpoint;
 585
 586         struct usb_device *dev = interface_to_usbdev(intf);
 587         struct ksdazzle_cb *kingsun = NULL;
 588         struct net_device *net = NULL;
 589         int ret = -ENOMEM;
 590         int pipe, maxp_in, maxp_out;
 591         __u8 ep_in;
 592         __u8 ep_out;
 593
 594         /* Check that there really are two interrupt endpoints. Check based on the
 595            one in drivers/usb/input/usbmouse.c
 596          */
 597         interface = intf->cur_altsetting;
 598         if (interface->desc.bNumEndpoints != 2) {
 599                 dev_err(&intf->dev, "ksdazzle: expected 2 endpoints, found %d\n",
 600                         interface->desc.bNumEndpoints);
 601                 return -ENODEV;
 602         }
 603         endpoint = &interface->endpoint[KINGSUN_EP_IN].desc;
 604         if (!usb_endpoint_is_int_in(endpoint)) {
 605                 dev_err(&intf->dev,
 606                         "ksdazzle: endpoint 0 is not interrupt IN\n");
 607                 return -ENODEV;
 608         }
 609
 610         ep_in = endpoint->bEndpointAddress;
 611         pipe = usb_rcvintpipe(dev, ep_in);
 612         maxp_in = usb_maxpacket(dev, pipe, usb_pipeout(pipe));
 613         if (maxp_in > 255 || maxp_in <= 1) {
 614                 dev_err(&intf->dev,
 615                         "ksdazzle: endpoint 0 has max packet size %d not in range [2..255]\n",
 616                         maxp_in);
 617                 return -ENODEV;
 618         }
 619
 620         endpoint = &interface->endpoint[KINGSUN_EP_OUT].desc;
 621         if (!usb_endpoint_is_int_out(endpoint)) {
 622                 dev_err(&intf->dev,
 623                         "ksdazzle: endpoint 1 is not interrupt OUT\n");
 624                 return -ENODEV;
 625         }
 626
 627         ep_out = endpoint->bEndpointAddress;
 628         pipe = usb_sndintpipe(dev, ep_out);
 629         maxp_out = usb_maxpacket(dev, pipe, usb_pipeout(pipe));
 630
 631         /* Allocate network device container. */
 632         net = alloc_irdadev(sizeof(*kingsun));
 633         if (!net)
 634                 goto err_out1;
 635
 636         SET_NETDEV_DEV(net, &intf->dev);
 637         kingsun = netdev_priv(net);
 638         kingsun->netdev = net;
 639         kingsun->usbdev = dev;
 640         kingsun->ep_in = ep_in;
 641         kingsun->ep_out = ep_out;
 642         kingsun->irlap = NULL;
 643         kingsun->tx_urb = NULL;
 644         kingsun->tx_buf_clear = NULL;
 645         kingsun->tx_buf_clear_used = 0;
 646         kingsun->tx_buf_clear_sent = 0;
 647
 648         kingsun->rx_urb = NULL;
 649         kingsun->rx_buf = NULL;
 650         kingsun->rx_unwrap_buff.in_frame = FALSE;
 651         kingsun->rx_unwrap_buff.state = OUTSIDE_FRAME;
 652         kingsun->rx_unwrap_buff.skb = NULL;
 653         kingsun->receiving = 0;
 654         spin_lock_init(&kingsun->lock);
 655
 656         kingsun->speed_setuprequest = NULL;
 657         kingsun->speed_urb = NULL;
 658         kingsun->speedparams.baudrate = 0;
 659
 660         /* Allocate input buffer */
 661         kingsun->rx_buf = kmalloc(KINGSUN_RCV_MAX, GFP_KERNEL);
 662         if (!kingsun->rx_buf)
 663                 goto free_mem;
 664
 665         /* Allocate output buffer */
 666         kingsun->tx_buf_clear = kmalloc(KINGSUN_SND_FIFO_SIZE, GFP_KERNEL);
 667         if (!kingsun->tx_buf_clear)
 668                 goto free_mem;
 669
 670         /* Allocate and initialize speed setup packet */
 671         kingsun->speed_setuprequest =
 672             kmalloc(sizeof(struct usb_ctrlrequest), GFP_KERNEL);
 673         if (!kingsun->speed_setuprequest)
 674                 goto free_mem;
 675         kingsun->speed_setuprequest->bRequestType =
 676             USB_DIR_OUT | USB_TYPE_CLASS | USB_RECIP_INTERFACE;
 677         kingsun->speed_setuprequest->bRequest = KINGSUN_REQ_SEND;
 678         kingsun->speed_setuprequest->wValue = cpu_to_le16(0x0200);
 679         kingsun->speed_setuprequest->wIndex = cpu_to_le16(0x0001);
 680         kingsun->speed_setuprequest->wLength =
 681             cpu_to_le16(sizeof(struct ksdazzle_speedparams));
 682
 683         printk(KERN_INFO "KingSun/Dazzle IRDA/USB found at address %d, "
 684                "Vendor: %x, Product: %x\n",
 685                dev->devnum, le16_to_cpu(dev->descriptor.idVendor),
 686                le16_to_cpu(dev->descriptor.idProduct));
 687
 688         /* Initialize QoS for this device */
 689         irda_init_max_qos_capabilies(&kingsun->qos);
 690
 691         /* Baud rates known to be supported. Please uncomment if devices (other
 692            than a SonyEriccson K300 phone) can be shown to support higher speeds
 693            with this dongle.
 694          */
 695         kingsun->qos.baud_rate.bits =
 696             IR_2400 | IR_9600 | IR_19200 | IR_38400 | IR_57600 | IR_115200;
 697         kingsun->qos.min_turn_time.bits &= KINGSUN_MTT;
 698         irda_qos_bits_to_value(&kingsun->qos);
 699
 700         /* Override the network functions we need to use */
 701         net->netdev_ops = &ksdazzle_ops;
 702
 703         ret = register_netdev(net);
 704         if (ret != 0)
 705                 goto free_mem;
 706
 707         dev_info(&net->dev, "IrDA: Registered KingSun/Dazzle device %s\n",
 708                  net->name);
 709
 710         usb_set_intfdata(intf, kingsun);
 711
 712         /* Situation at this point:
 713            - all work buffers allocated
 714            - setup requests pre-filled
 715            - urbs not allocated, set to NULL
 716            - max rx packet known (is KINGSUN_FIFO_SIZE)
 717            - unwrap state machine (partially) initialized, but skb == NULL
 718          */
 719
 720         return 0;
 721
 722       free_mem:
 723         kfree(kingsun->speed_setuprequest);
 724         kfree(kingsun->tx_buf_clear);
 725         kfree(kingsun->rx_buf);
 726         free_netdev(net);
 727       err_out1:
 728         return ret;
 729 }
 730
 731 /*
 732  * The current device is removed, the USB layer tell us to shut it down...
 733  */
 734 static void ksdazzle_disconnect(struct usb_interface *intf)
 735 {
 736         struct ksdazzle_cb *kingsun = usb_get_intfdata(intf);
 737
 738         if (!kingsun)
 739                 return;
 740
 741         unregister_netdev(kingsun->netdev);
 742
 743         /* Mop up receive && transmit urb's */
 744         usb_kill_urb(kingsun->speed_urb);
 745         usb_free_urb(kingsun->speed_urb);
 746         kingsun->speed_urb = NULL;
 747
 748         usb_kill_urb(kingsun->tx_urb);
 749         usb_free_urb(kingsun->tx_urb);
 750         kingsun->tx_urb = NULL;
 751
 752         usb_kill_urb(kingsun->rx_urb);
 753         usb_free_urb(kingsun->rx_urb);
 754         kingsun->rx_urb = NULL;
 755
 756         kfree(kingsun->speed_setuprequest);
 757         kfree(kingsun->tx_buf_clear);
 758         kfree(kingsun->rx_buf);
 759         free_netdev(kingsun->netdev);
 760
 761         usb_set_intfdata(intf, NULL);
 762 }
 763
 764 #ifdef CONFIG_PM
 765 /* USB suspend, so power off the transmitter/receiver */
 766 static int ksdazzle_suspend(struct usb_interface *intf, pm_message_t message)
 767 {
 768         struct ksdazzle_cb *kingsun = usb_get_intfdata(intf);
 769
 770         netif_device_detach(kingsun->netdev);
 771         if (kingsun->speed_urb != NULL)
 772                 usb_kill_urb(kingsun->speed_urb);
 773         if (kingsun->tx_urb != NULL)
 774                 usb_kill_urb(kingsun->tx_urb);
 775         if (kingsun->rx_urb != NULL)
 776                 usb_kill_urb(kingsun->rx_urb);
 777         return 0;
 778 }
 779
 780 /* Coming out of suspend, so reset hardware */
 781 static int ksdazzle_resume(struct usb_interface *intf)
 782 {
 783         struct ksdazzle_cb *kingsun = usb_get_intfdata(intf);
 784
 785         if (kingsun->rx_urb != NULL) {
 786                 /* Setup request already filled in ksdazzle_probe */
 787                 usb_submit_urb(kingsun->rx_urb, GFP_KERNEL);
 788         }
 789         netif_device_attach(kingsun->netdev);
 790
 791         return 0;
 792 }
 793 #endif
 794
 795 /*
 796  * USB device callbacks
 797  */
 798 static struct usb_driver irda_driver = {
 799         .name = "ksdazzle-sir",
 800         .probe = ksdazzle_probe,
 801         .disconnect = ksdazzle_disconnect,
 802         .id_table = dongles,
 803 #ifdef CONFIG_PM
 804         .suspend = ksdazzle_suspend,
 805         .resume = ksdazzle_resume,
 806 #endif
 807 };
 808
 809 module_usb_driver(irda_driver);
 810
 811 MODULE_AUTHOR("Alex Villacís Lasso <a_villacis@palosanto.com>");
 812 MODULE_DESCRIPTION("IrDA-USB Dongle Driver for KingSun Dazzle");
 813 MODULE_LICENSE("GPL");