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/init.h>
  84 #include <linux/slab.h>
  85 #include <linux/kref.h>
  86 #include <linux/usb.h>
  87 #include <linux/device.h>
  88 #include <linux/crc32.h>
  89
  90 #include <asm/unaligned.h>
  91 #include <asm/byteorder.h>
  92 #include <asm/uaccess.h>
  93
  94 #include <net/irda/irda.h>
  95 #include <net/irda/wrapper.h>
  96 #include <net/irda/crc.h>
  97
  98 #define KSDAZZLE_VENDOR_ID 0x07d0
  99 #define KSDAZZLE_PRODUCT_ID 0x4100
 100
 101 /* These are the currently known USB ids */
 102 static struct usb_device_id dongles[] = {
 103         /* KingSun Co,Ltd  IrDA/USB Bridge */
 104         {USB_DEVICE(KSDAZZLE_VENDOR_ID, KSDAZZLE_PRODUCT_ID)},
 105         {}
 106 };
 107
 108 MODULE_DEVICE_TABLE(usb, dongles);
 109
 110 #define KINGSUN_MTT 0x07
 111 #define KINGSUN_REQ_RECV 0x01
 112 #define KINGSUN_REQ_SEND 0x09
 113
 114 #define KINGSUN_SND_FIFO_SIZE    2048   /* Max packet we can send */
 115 #define KINGSUN_RCV_MAX 2048    /* Max transfer we can receive */
 116
 117 struct ksdazzle_speedparams {
 118         __le32 baudrate;        /* baud rate, little endian */
 119         __u8 flags;
 120         __u8 reserved[3];
 121 } __attribute__ ((packed));
 122
 123 #define KS_DATA_5_BITS 0x00
 124 #define KS_DATA_6_BITS 0x01
 125 #define KS_DATA_7_BITS 0x02
 126 #define KS_DATA_8_BITS 0x03
 127
 128 #define KS_STOP_BITS_1 0x00
 129 #define KS_STOP_BITS_2 0x08
 130
 131 #define KS_PAR_DISABLE    0x00
 132 #define KS_PAR_EVEN    0x10
 133 #define KS_PAR_ODD    0x30
 134 #define KS_RESET    0x80
 135
 136 #define KINGSUN_EP_IN                   0
 137 #define KINGSUN_EP_OUT                  1
 138
 139 struct ksdazzle_cb {
 140         struct usb_device *usbdev;      /* init: probe_irda */
 141         struct net_device *netdev;      /* network layer */
 142         struct irlap_cb *irlap; /* The link layer we are binded to */
 143
 144         struct qos_info qos;
 145
 146         struct urb *tx_urb;
 147         __u8 *tx_buf_clear;
 148         unsigned int tx_buf_clear_used;
 149         unsigned int tx_buf_clear_sent;
 150         __u8 tx_payload[8];
 151
 152         struct urb *rx_urb;
 153         __u8 *rx_buf;
 154         iobuff_t rx_unwrap_buff;
 155
 156         struct usb_ctrlrequest *speed_setuprequest;
 157         struct urb *speed_urb;
 158         struct ksdazzle_speedparams speedparams;
 159         unsigned int new_speed;
 160
 161         __u8 ep_in;
 162         __u8 ep_out;
 163
 164         spinlock_t lock;
 165         int receiving;
 166 };
 167
 168 /* Callback transmission routine */
 169 static void ksdazzle_speed_irq(struct urb *urb)
 170 {
 171         /* unlink, shutdown, unplug, other nasties */
 172         if (urb->status != 0) {
 173                 err("ksdazzle_speed_irq: urb asynchronously failed - %d",
 174                     urb->status);
 175         }
 176 }
 177
 178 /* Send a control request to change speed of the dongle */
 179 static int ksdazzle_change_speed(struct ksdazzle_cb *kingsun, unsigned speed)
 180 {
 181         static unsigned int supported_speeds[] = { 2400, 9600, 19200, 38400,
 182                 57600, 115200, 576000, 1152000, 4000000, 0
 183         };
 184         int err;
 185         unsigned int i;
 186
 187         if (kingsun->speed_setuprequest == NULL || kingsun->speed_urb == NULL)
 188                 return -ENOMEM;
 189
 190         /* Check that requested speed is among the supported ones */
 191         for (i = 0; supported_speeds[i] && supported_speeds[i] != speed; i++) ;
 192         if (supported_speeds[i] == 0)
 193                 return -EOPNOTSUPP;
 194
 195         memset(&(kingsun->speedparams), 0, sizeof(struct ksdazzle_speedparams));
 196         kingsun->speedparams.baudrate = cpu_to_le32(speed);
 197         kingsun->speedparams.flags = KS_DATA_8_BITS;
 198
 199         /* speed_setuprequest pre-filled in ksdazzle_probe */
 200         usb_fill_control_urb(kingsun->speed_urb, kingsun->usbdev,
 201                              usb_sndctrlpipe(kingsun->usbdev, 0),
 202                              (unsigned char *)kingsun->speed_setuprequest,
 203                              &(kingsun->speedparams),
 204                              sizeof(struct ksdazzle_speedparams),
 205                              ksdazzle_speed_irq, kingsun);
 206         kingsun->speed_urb->status = 0;
 207         err = usb_submit_urb(kingsun->speed_urb, GFP_ATOMIC);
 208
 209         return err;
 210 }
 211
 212 /* Submit one fragment of an IrDA frame to the dongle */
 213 static void ksdazzle_send_irq(struct urb *urb);
 214 static int ksdazzle_submit_tx_fragment(struct ksdazzle_cb *kingsun)
 215 {
 216         unsigned int wraplen;
 217         int ret;
 218
 219         /* We can send at most 7 bytes of payload at a time */
 220         wraplen = 7;
 221         if (wraplen > kingsun->tx_buf_clear_used)
 222                 wraplen = kingsun->tx_buf_clear_used;
 223
 224         /* Prepare payload prefix with used length */
 225         memset(kingsun->tx_payload, 0, 8);
 226         kingsun->tx_payload[0] = (unsigned char)0xf8 + wraplen;
 227         memcpy(kingsun->tx_payload + 1, kingsun->tx_buf_clear, wraplen);
 228
 229         usb_fill_int_urb(kingsun->tx_urb, kingsun->usbdev,
 230                          usb_sndintpipe(kingsun->usbdev, kingsun->ep_out),
 231                          kingsun->tx_payload, 8, ksdazzle_send_irq, kingsun, 1);
 232         kingsun->tx_urb->status = 0;
 233         ret = usb_submit_urb(kingsun->tx_urb, GFP_ATOMIC);
 234
 235         /* Remember how much data was sent, in order to update at callback */
 236         kingsun->tx_buf_clear_sent = (ret == 0) ? wraplen : 0;
 237         return ret;
 238 }
 239
 240 /* Callback transmission routine */
 241 static void ksdazzle_send_irq(struct urb *urb)
 242 {
 243         struct ksdazzle_cb *kingsun = urb->context;
 244         struct net_device *netdev = kingsun->netdev;
 245         int ret = 0;
 246
 247         /* in process of stopping, just drop data */
 248         if (!netif_running(kingsun->netdev)) {
 249                 err("ksdazzle_send_irq: Network not running!");
 250                 return;
 251         }
 252
 253         /* unlink, shutdown, unplug, other nasties */
 254         if (urb->status != 0) {
 255                 err("ksdazzle_send_irq: urb asynchronously failed - %d",
 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                                 err("ksdazzle_send_irq: failed tx_urb submit: %d", ret);
 276                                 switch (ret) {
 277                                 case -ENODEV:
 278                                 case -EPIPE:
 279                                         break;
 280                                 default:
 281                                         netdev->stats.tx_errors++;
 282                                         netif_start_queue(netdev);
 283                                 }
 284                         }
 285                 } else {
 286                         /* All data sent, send next speed && wake network queue */
 287                         if (kingsun->new_speed != -1 &&
 288                             cpu_to_le32(kingsun->new_speed) !=
 289                             kingsun->speedparams.baudrate)
 290                                 ksdazzle_change_speed(kingsun,
 291                                                       kingsun->new_speed);
 292
 293                         netif_wake_queue(netdev);
 294                 }
 295         }
 296 }
 297
 298 /*
 299  * Called from net/core when new frame is available.
 300  */
 301 static netdev_tx_t ksdazzle_hard_xmit(struct sk_buff *skb,
 302                                             struct net_device *netdev)
 303 {
 304         struct ksdazzle_cb *kingsun;
 305         unsigned int wraplen;
 306         int ret = 0;
 307
 308         netif_stop_queue(netdev);
 309
 310         /* the IRDA wrapping routines don't deal with non linear skb */
 311         SKB_LINEAR_ASSERT(skb);
 312
 313         kingsun = netdev_priv(netdev);
 314
 315         spin_lock(&kingsun->lock);
 316         kingsun->new_speed = irda_get_next_speed(skb);
 317
 318         /* Append data to the end of whatever data remains to be transmitted */
 319         wraplen =
 320             async_wrap_skb(skb, kingsun->tx_buf_clear, KINGSUN_SND_FIFO_SIZE);
 321         kingsun->tx_buf_clear_used = wraplen;
 322
 323         if ((ret = ksdazzle_submit_tx_fragment(kingsun)) != 0) {
 324                 err("ksdazzle_hard_xmit: failed tx_urb submit: %d", ret);
 325                 switch (ret) {
 326                 case -ENODEV:
 327                 case -EPIPE:
 328                         break;
 329                 default:
 330                         netdev->stats.tx_errors++;
 331                         netif_start_queue(netdev);
 332                 }
 333         } else {
 334                 netdev->stats.tx_packets++;
 335                 netdev->stats.tx_bytes += skb->len;
 336
 337         }
 338
 339         dev_kfree_skb(skb);
 340         spin_unlock(&kingsun->lock);
 341
 342         return NETDEV_TX_OK;
 343 }
 344
 345 /* Receive callback function */
 346 static void ksdazzle_rcv_irq(struct urb *urb)
 347 {
 348         struct ksdazzle_cb *kingsun = urb->context;
 349         struct net_device *netdev = kingsun->netdev;
 350
 351         /* in process of stopping, just drop data */
 352         if (!netif_running(netdev)) {
 353                 kingsun->receiving = 0;
 354                 return;
 355         }
 356
 357         /* unlink, shutdown, unplug, other nasties */
 358         if (urb->status != 0) {
 359                 err("ksdazzle_rcv_irq: urb asynchronously failed - %d",
 360                     urb->status);
 361                 kingsun->receiving = 0;
 362                 return;
 363         }
 364
 365         if (urb->actual_length > 0) {
 366                 __u8 *bytes = urb->transfer_buffer;
 367                 unsigned int i;
 368
 369                 for (i = 0; i < urb->actual_length; i++) {
 370                         async_unwrap_char(netdev, &netdev->stats,
 371                                           &kingsun->rx_unwrap_buff, bytes[i]);
 372                 }
 373                 kingsun->receiving =
 374                     (kingsun->rx_unwrap_buff.state != OUTSIDE_FRAME) ? 1 : 0;
 375         }
 376
 377         /* This urb has already been filled in ksdazzle_net_open. It is assumed that
 378            urb keeps the pointer to the payload buffer.
 379          */
 380         urb->status = 0;
 381         usb_submit_urb(urb, GFP_ATOMIC);
 382 }
 383
 384 /*
 385  * Function ksdazzle_net_open (dev)
 386  *
 387  *    Network device is taken up. Usually this is done by "ifconfig irda0 up"
 388  */
 389 static int ksdazzle_net_open(struct net_device *netdev)
 390 {
 391         struct ksdazzle_cb *kingsun = netdev_priv(netdev);
 392         int err = -ENOMEM;
 393         char hwname[16];
 394
 395         /* At this point, urbs are NULL, and skb is NULL (see ksdazzle_probe) */
 396         kingsun->receiving = 0;
 397
 398         /* Initialize for SIR to copy data directly into skb.  */
 399         kingsun->rx_unwrap_buff.in_frame = FALSE;
 400         kingsun->rx_unwrap_buff.state = OUTSIDE_FRAME;
 401         kingsun->rx_unwrap_buff.truesize = IRDA_SKB_MAX_MTU;
 402         kingsun->rx_unwrap_buff.skb = dev_alloc_skb(IRDA_SKB_MAX_MTU);
 403         if (!kingsun->rx_unwrap_buff.skb)
 404                 goto free_mem;
 405
 406         skb_reserve(kingsun->rx_unwrap_buff.skb, 1);
 407         kingsun->rx_unwrap_buff.head = kingsun->rx_unwrap_buff.skb->data;
 408
 409         kingsun->rx_urb = usb_alloc_urb(0, GFP_KERNEL);
 410         if (!kingsun->rx_urb)
 411                 goto free_mem;
 412
 413         kingsun->tx_urb = usb_alloc_urb(0, GFP_KERNEL);
 414         if (!kingsun->tx_urb)
 415                 goto free_mem;
 416
 417         kingsun->speed_urb = usb_alloc_urb(0, GFP_KERNEL);
 418         if (!kingsun->speed_urb)
 419                 goto free_mem;
 420
 421         /* Initialize speed for dongle */
 422         kingsun->new_speed = 9600;
 423         err = ksdazzle_change_speed(kingsun, 9600);
 424         if (err < 0)
 425                 goto free_mem;
 426
 427         /*
 428          * Now that everything should be initialized properly,
 429          * Open new IrLAP layer instance to take care of us...
 430          */
 431         sprintf(hwname, "usb#%d", kingsun->usbdev->devnum);
 432         kingsun->irlap = irlap_open(netdev, &kingsun->qos, hwname);
 433         if (!kingsun->irlap) {
 434                 err("ksdazzle-sir: irlap_open failed");
 435                 goto free_mem;
 436         }
 437
 438         /* Start reception. */
 439         usb_fill_int_urb(kingsun->rx_urb, kingsun->usbdev,
 440                          usb_rcvintpipe(kingsun->usbdev, kingsun->ep_in),
 441                          kingsun->rx_buf, KINGSUN_RCV_MAX, ksdazzle_rcv_irq,
 442                          kingsun, 1);
 443         kingsun->rx_urb->status = 0;
 444         err = usb_submit_urb(kingsun->rx_urb, GFP_KERNEL);
 445         if (err) {
 446                 err("ksdazzle-sir: first urb-submit failed: %d", err);
 447                 goto close_irlap;
 448         }
 449
 450         netif_start_queue(netdev);
 451
 452         /* Situation at this point:
 453            - all work buffers allocated
 454            - urbs allocated and ready to fill
 455            - max rx packet known (in max_rx)
 456            - unwrap state machine initialized, in state outside of any frame
 457            - receive request in progress
 458            - IrLAP layer started, about to hand over packets to send
 459          */
 460
 461         return 0;
 462
 463       close_irlap:
 464         irlap_close(kingsun->irlap);
 465       free_mem:
 466         usb_free_urb(kingsun->speed_urb);
 467         kingsun->speed_urb = NULL;
 468         usb_free_urb(kingsun->tx_urb);
 469         kingsun->tx_urb = NULL;
 470         usb_free_urb(kingsun->rx_urb);
 471         kingsun->rx_urb = NULL;
 472         if (kingsun->rx_unwrap_buff.skb) {
 473                 kfree_skb(kingsun->rx_unwrap_buff.skb);
 474                 kingsun->rx_unwrap_buff.skb = NULL;
 475                 kingsun->rx_unwrap_buff.head = NULL;
 476         }
 477         return err;
 478 }
 479
 480 /*
 481  * Function ksdazzle_net_close (dev)
 482  *
 483  *    Network device is taken down. Usually this is done by
 484  *    "ifconfig irda0 down"
 485  */
 486 static int ksdazzle_net_close(struct net_device *netdev)
 487 {
 488         struct ksdazzle_cb *kingsun = netdev_priv(netdev);
 489
 490         /* Stop transmit processing */
 491         netif_stop_queue(netdev);
 492
 493         /* Mop up receive && transmit urb's */
 494         usb_kill_urb(kingsun->tx_urb);
 495         usb_free_urb(kingsun->tx_urb);
 496         kingsun->tx_urb = NULL;
 497
 498         usb_kill_urb(kingsun->speed_urb);
 499         usb_free_urb(kingsun->speed_urb);
 500         kingsun->speed_urb = NULL;
 501
 502         usb_kill_urb(kingsun->rx_urb);
 503         usb_free_urb(kingsun->rx_urb);
 504         kingsun->rx_urb = NULL;
 505
 506         kfree_skb(kingsun->rx_unwrap_buff.skb);
 507         kingsun->rx_unwrap_buff.skb = NULL;
 508         kingsun->rx_unwrap_buff.head = NULL;
 509         kingsun->rx_unwrap_buff.in_frame = FALSE;
 510         kingsun->rx_unwrap_buff.state = OUTSIDE_FRAME;
 511         kingsun->receiving = 0;
 512
 513         /* Stop and remove instance of IrLAP */
 514         irlap_close(kingsun->irlap);
 515
 516         kingsun->irlap = NULL;
 517
 518         return 0;
 519 }
 520
 521 /*
 522  * IOCTLs : Extra out-of-band network commands...
 523  */
 524 static int ksdazzle_net_ioctl(struct net_device *netdev, struct ifreq *rq,
 525                               int cmd)
 526 {
 527         struct if_irda_req *irq = (struct if_irda_req *)rq;
 528         struct ksdazzle_cb *kingsun = netdev_priv(netdev);
 529         int ret = 0;
 530
 531         switch (cmd) {
 532         case SIOCSBANDWIDTH:    /* Set bandwidth */
 533                 if (!capable(CAP_NET_ADMIN))
 534                         return -EPERM;
 535
 536                 /* Check if the device is still there */
 537                 if (netif_device_present(kingsun->netdev))
 538                         return ksdazzle_change_speed(kingsun,
 539                                                      irq->ifr_baudrate);
 540                 break;
 541
 542         case SIOCSMEDIABUSY:    /* Set media busy */
 543                 if (!capable(CAP_NET_ADMIN))
 544                         return -EPERM;
 545
 546                 /* Check if the IrDA stack is still there */
 547                 if (netif_running(kingsun->netdev))
 548                         irda_device_set_media_busy(kingsun->netdev, TRUE);
 549                 break;
 550
 551         case SIOCGRECEIVING:
 552                 /* Only approximately true */
 553                 irq->ifr_receiving = kingsun->receiving;
 554                 break;
 555
 556         default:
 557                 ret = -EOPNOTSUPP;
 558         }
 559
 560         return ret;
 561 }
 562
 563 static const struct net_device_ops ksdazzle_ops = {
 564         .ndo_start_xmit = ksdazzle_hard_xmit,
 565         .ndo_open       = ksdazzle_net_open,
 566         .ndo_stop       = ksdazzle_net_close,
 567         .ndo_do_ioctl   = ksdazzle_net_ioctl,
 568 };
 569
 570 /*
 571  * This routine is called by the USB subsystem for each new device
 572  * in the system. We need to check if the device is ours, and in
 573  * this case start handling it.
 574  */
 575 static int ksdazzle_probe(struct usb_interface *intf,
 576                           const struct usb_device_id *id)
 577 {
 578         struct usb_host_interface *interface;
 579         struct usb_endpoint_descriptor *endpoint;
 580
 581         struct usb_device *dev = interface_to_usbdev(intf);
 582         struct ksdazzle_cb *kingsun = NULL;
 583         struct net_device *net = NULL;
 584         int ret = -ENOMEM;
 585         int pipe, maxp_in, maxp_out;
 586         __u8 ep_in;
 587         __u8 ep_out;
 588
 589         /* Check that there really are two interrupt endpoints. Check based on the
 590            one in drivers/usb/input/usbmouse.c
 591          */
 592         interface = intf->cur_altsetting;
 593         if (interface->desc.bNumEndpoints != 2) {
 594                 err("ksdazzle: expected 2 endpoints, found %d",
 595                     interface->desc.bNumEndpoints);
 596                 return -ENODEV;
 597         }
 598         endpoint = &interface->endpoint[KINGSUN_EP_IN].desc;
 599         if (!usb_endpoint_is_int_in(endpoint)) {
 600                 err("ksdazzle: endpoint 0 is not interrupt IN");
 601                 return -ENODEV;
 602         }
 603
 604         ep_in = endpoint->bEndpointAddress;
 605         pipe = usb_rcvintpipe(dev, ep_in);
 606         maxp_in = usb_maxpacket(dev, pipe, usb_pipeout(pipe));
 607         if (maxp_in > 255 || maxp_in <= 1) {
 608                 err("ksdazzle: endpoint 0 has max packet size %d not in range [2..255]", maxp_in);
 609                 return -ENODEV;
 610         }
 611
 612         endpoint = &interface->endpoint[KINGSUN_EP_OUT].desc;
 613         if (!usb_endpoint_is_int_out(endpoint)) {
 614                 err("ksdazzle: endpoint 1 is not interrupt OUT");
 615                 return -ENODEV;
 616         }
 617
 618         ep_out = endpoint->bEndpointAddress;
 619         pipe = usb_sndintpipe(dev, ep_out);
 620         maxp_out = usb_maxpacket(dev, pipe, usb_pipeout(pipe));
 621
 622         /* Allocate network device container. */
 623         net = alloc_irdadev(sizeof(*kingsun));
 624         if (!net)
 625                 goto err_out1;
 626
 627         SET_NETDEV_DEV(net, &intf->dev);
 628         kingsun = netdev_priv(net);
 629         kingsun->netdev = net;
 630         kingsun->usbdev = dev;
 631         kingsun->ep_in = ep_in;
 632         kingsun->ep_out = ep_out;
 633         kingsun->irlap = NULL;
 634         kingsun->tx_urb = NULL;
 635         kingsun->tx_buf_clear = NULL;
 636         kingsun->tx_buf_clear_used = 0;
 637         kingsun->tx_buf_clear_sent = 0;
 638
 639         kingsun->rx_urb = NULL;
 640         kingsun->rx_buf = NULL;
 641         kingsun->rx_unwrap_buff.in_frame = FALSE;
 642         kingsun->rx_unwrap_buff.state = OUTSIDE_FRAME;
 643         kingsun->rx_unwrap_buff.skb = NULL;
 644         kingsun->receiving = 0;
 645         spin_lock_init(&kingsun->lock);
 646
 647         kingsun->speed_setuprequest = NULL;
 648         kingsun->speed_urb = NULL;
 649         kingsun->speedparams.baudrate = 0;
 650
 651         /* Allocate input buffer */
 652         kingsun->rx_buf = kmalloc(KINGSUN_RCV_MAX, GFP_KERNEL);
 653         if (!kingsun->rx_buf)
 654                 goto free_mem;
 655
 656         /* Allocate output buffer */
 657         kingsun->tx_buf_clear = kmalloc(KINGSUN_SND_FIFO_SIZE, GFP_KERNEL);
 658         if (!kingsun->tx_buf_clear)
 659                 goto free_mem;
 660
 661         /* Allocate and initialize speed setup packet */
 662         kingsun->speed_setuprequest =
 663             kmalloc(sizeof(struct usb_ctrlrequest), GFP_KERNEL);
 664         if (!kingsun->speed_setuprequest)
 665                 goto free_mem;
 666         kingsun->speed_setuprequest->bRequestType =
 667             USB_DIR_OUT | USB_TYPE_CLASS | USB_RECIP_INTERFACE;
 668         kingsun->speed_setuprequest->bRequest = KINGSUN_REQ_SEND;
 669         kingsun->speed_setuprequest->wValue = cpu_to_le16(0x0200);
 670         kingsun->speed_setuprequest->wIndex = cpu_to_le16(0x0001);
 671         kingsun->speed_setuprequest->wLength =
 672             cpu_to_le16(sizeof(struct ksdazzle_speedparams));
 673
 674         printk(KERN_INFO "KingSun/Dazzle IRDA/USB found at address %d, "
 675                "Vendor: %x, Product: %x\n",
 676                dev->devnum, le16_to_cpu(dev->descriptor.idVendor),
 677                le16_to_cpu(dev->descriptor.idProduct));
 678
 679         /* Initialize QoS for this device */
 680         irda_init_max_qos_capabilies(&kingsun->qos);
 681
 682         /* Baud rates known to be supported. Please uncomment if devices (other
 683            than a SonyEriccson K300 phone) can be shown to support higher speeds
 684            with this dongle.
 685          */
 686         kingsun->qos.baud_rate.bits =
 687             IR_2400 | IR_9600 | IR_19200 | IR_38400 | IR_57600 | IR_115200;
 688         kingsun->qos.min_turn_time.bits &= KINGSUN_MTT;
 689         irda_qos_bits_to_value(&kingsun->qos);
 690
 691         /* Override the network functions we need to use */
 692         net->netdev_ops = &ksdazzle_ops;
 693
 694         ret = register_netdev(net);
 695         if (ret != 0)
 696                 goto free_mem;
 697
 698         dev_info(&net->dev, "IrDA: Registered KingSun/Dazzle device %s\n",
 699                  net->name);
 700
 701         usb_set_intfdata(intf, kingsun);
 702
 703         /* Situation at this point:
 704            - all work buffers allocated
 705            - setup requests pre-filled
 706            - urbs not allocated, set to NULL
 707            - max rx packet known (is KINGSUN_FIFO_SIZE)
 708            - unwrap state machine (partially) initialized, but skb == NULL
 709          */
 710
 711         return 0;
 712
 713       free_mem:
 714         kfree(kingsun->speed_setuprequest);
 715         kfree(kingsun->tx_buf_clear);
 716         kfree(kingsun->rx_buf);
 717         free_netdev(net);
 718       err_out1:
 719         return ret;
 720 }
 721
 722 /*
 723  * The current device is removed, the USB layer tell us to shut it down...
 724  */
 725 static void ksdazzle_disconnect(struct usb_interface *intf)
 726 {
 727         struct ksdazzle_cb *kingsun = usb_get_intfdata(intf);
 728
 729         if (!kingsun)
 730                 return;
 731
 732         unregister_netdev(kingsun->netdev);
 733
 734         /* Mop up receive && transmit urb's */
 735         usb_kill_urb(kingsun->speed_urb);
 736         usb_free_urb(kingsun->speed_urb);
 737         kingsun->speed_urb = NULL;
 738
 739         usb_kill_urb(kingsun->tx_urb);
 740         usb_free_urb(kingsun->tx_urb);
 741         kingsun->tx_urb = NULL;
 742
 743         usb_kill_urb(kingsun->rx_urb);
 744         usb_free_urb(kingsun->rx_urb);
 745         kingsun->rx_urb = NULL;
 746
 747         kfree(kingsun->speed_setuprequest);
 748         kfree(kingsun->tx_buf_clear);
 749         kfree(kingsun->rx_buf);
 750         free_netdev(kingsun->netdev);
 751
 752         usb_set_intfdata(intf, NULL);
 753 }
 754
 755 #ifdef CONFIG_PM
 756 /* USB suspend, so power off the transmitter/receiver */
 757 static int ksdazzle_suspend(struct usb_interface *intf, pm_message_t message)
 758 {
 759         struct ksdazzle_cb *kingsun = usb_get_intfdata(intf);
 760
 761         netif_device_detach(kingsun->netdev);
 762         if (kingsun->speed_urb != NULL)
 763                 usb_kill_urb(kingsun->speed_urb);
 764         if (kingsun->tx_urb != NULL)
 765                 usb_kill_urb(kingsun->tx_urb);
 766         if (kingsun->rx_urb != NULL)
 767                 usb_kill_urb(kingsun->rx_urb);
 768         return 0;
 769 }
 770
 771 /* Coming out of suspend, so reset hardware */
 772 static int ksdazzle_resume(struct usb_interface *intf)
 773 {
 774         struct ksdazzle_cb *kingsun = usb_get_intfdata(intf);
 775
 776         if (kingsun->rx_urb != NULL) {
 777                 /* Setup request already filled in ksdazzle_probe */
 778                 usb_submit_urb(kingsun->rx_urb, GFP_KERNEL);
 779         }
 780         netif_device_attach(kingsun->netdev);
 781
 782         return 0;
 783 }
 784 #endif
 785
 786 /*
 787  * USB device callbacks
 788  */
 789 static struct usb_driver irda_driver = {
 790         .name = "ksdazzle-sir",
 791         .probe = ksdazzle_probe,
 792         .disconnect = ksdazzle_disconnect,
 793         .id_table = dongles,
 794 #ifdef CONFIG_PM
 795         .suspend = ksdazzle_suspend,
 796         .resume = ksdazzle_resume,
 797 #endif
 798 };
 799
 800 /*
 801  * Module insertion
 802  */
 803 static int __init ksdazzle_init(void)
 804 {
 805         return usb_register(&irda_driver);
 806 }
 807
 808 module_init(ksdazzle_init);
 809
 810 /*
 811  * Module removal
 812  */
 813 static void __exit ksdazzle_cleanup(void)
 814 {
 815         /* Deregister the driver and remove all pending instances */
 816         usb_deregister(&irda_driver);
 817 }
 818
 819 module_exit(ksdazzle_cleanup);
 820
 821 MODULE_AUTHOR("Alex Villacís Lasso <a_villacis@palosanto.com>");
 822 MODULE_DESCRIPTION("IrDA-USB Dongle Driver for KingSun Dazzle");
 823 MODULE_LICENSE("GPL");