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   1 /******************************************************************************
   2  *  usbatm.c - Generic USB xDSL driver core
   3  *
   4  *  Copyright (C) 2001, Alcatel
   5  *  Copyright (C) 2003, Duncan Sands, SolNegro, Josep Comas
   6  *  Copyright (C) 2004, David Woodhouse, Roman Kagan
   7  *
   8  *  This program is free software; you can redistribute it and/or modify it
   9  *  under the terms of the GNU General Public License as published by the Free
  10  *  Software Foundation; either version 2 of the License, or (at your option)
  11  *  any later version.
  12  *
  13  *  This program is distributed in the hope that it will be useful, but WITHOUT
  14  *  ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
  15  *  FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License for
  16  *  more details.
  17  *
  18  *  You should have received a copy of the GNU General Public License along with
  19  *  this program; if not, write to the Free Software Foundation, Inc., 59
  20  *  Temple Place - Suite 330, Boston, MA  02111-1307, USA.
  21  *
  22  ******************************************************************************/
  23
  24 /*
  25  *  Written by Johan Verrept, Duncan Sands (duncan.sands@free.fr) and David Woodhouse
  26  *
  27  *  1.7+:       - See the check-in logs
  28  *
  29  *  1.6:        - No longer opens a connection if the firmware is not loaded
  30  *              - Added support for the speedtouch 330
  31  *              - Removed the limit on the number of devices
  32  *              - Module now autoloads on device plugin
  33  *              - Merged relevant parts of sarlib
  34  *              - Replaced the kernel thread with a tasklet
  35  *              - New packet transmission code
  36  *              - Changed proc file contents
  37  *              - Fixed all known SMP races
  38  *              - Many fixes and cleanups
  39  *              - Various fixes by Oliver Neukum (oliver@neukum.name)
  40  *
  41  *  1.5A:       - Version for inclusion in 2.5 series kernel
  42  *              - Modifications by Richard Purdie (rpurdie@rpsys.net)
  43  *              - made compatible with kernel 2.5.6 onwards by changing
  44  *              usbatm_usb_send_data_context->urb to a pointer and adding code
  45  *              to alloc and free it
  46  *              - remove_wait_queue() added to usbatm_atm_processqueue_thread()
  47  *
  48  *  1.5:        - fixed memory leak when atmsar_decode_aal5 returned NULL.
  49  *              (reported by stephen.robinson@zen.co.uk)
  50  *
  51  *  1.4:        - changed the spin_lock() under interrupt to spin_lock_irqsave()
  52  *              - unlink all active send urbs of a vcc that is being closed.
  53  *
  54  *  1.3.1:      - added the version number
  55  *
  56  *  1.3:        - Added multiple send urb support
  57  *              - fixed memory leak and vcc->tx_inuse starvation bug
  58  *                when not enough memory left in vcc.
  59  *
  60  *  1.2:        - Fixed race condition in usbatm_usb_send_data()
  61  *  1.1:        - Turned off packet debugging
  62  *
  63  */
  64
  65 #include "usbatm.h"
  66
  67 #include <asm/uaccess.h>
  68 #include <linux/crc32.h>
  69 #include <linux/errno.h>
  70 #include <linux/init.h>
  71 #include <linux/interrupt.h>
  72 #include <linux/kernel.h>
  73 #include <linux/module.h>
  74 #include <linux/moduleparam.h>
  75 #include <linux/proc_fs.h>
  76 #include <linux/sched.h>
  77 #include <linux/signal.h>
  78 #include <linux/slab.h>
  79 #include <linux/smp_lock.h>
  80 #include <linux/stat.h>
  81 #include <linux/timer.h>
  82 #include <linux/wait.h>
  83
  84 #ifdef VERBOSE_DEBUG
  85 static int usbatm_print_packet(const unsigned char *data, int len);
  86 #define PACKETDEBUG(arg...)     usbatm_print_packet (arg)
  87 #define vdbg(arg...)            dbg (arg)
  88 #else
  89 #define PACKETDEBUG(arg...)
  90 #define vdbg(arg...)
  91 #endif
  92
  93 #define DRIVER_AUTHOR   "Johan Verrept, Duncan Sands <duncan.sands@free.fr>"
  94 #define DRIVER_VERSION  "1.9"
  95 #define DRIVER_DESC     "Generic USB ATM/DSL I/O, version " DRIVER_VERSION
  96
  97 static const char usbatm_driver_name[] = "usbatm";
  98
  99 #define UDSL_MAX_RCV_URBS               16
 100 #define UDSL_MAX_SND_URBS               16
 101 #define UDSL_MAX_RCV_BUF_SIZE           1024    /* ATM cells */
 102 #define UDSL_MAX_SND_BUF_SIZE           1024    /* ATM cells */
 103 #define UDSL_DEFAULT_RCV_URBS           4
 104 #define UDSL_DEFAULT_SND_URBS           4
 105 #define UDSL_DEFAULT_RCV_BUF_SIZE       64      /* ATM cells */
 106 #define UDSL_DEFAULT_SND_BUF_SIZE       64      /* ATM cells */
 107
 108 #define ATM_CELL_HEADER                 (ATM_CELL_SIZE - ATM_CELL_PAYLOAD)
 109
 110 #define THROTTLE_MSECS                  100     /* delay to recover processing after urb submission fails */
 111
 112 static unsigned int num_rcv_urbs = UDSL_DEFAULT_RCV_URBS;
 113 static unsigned int num_snd_urbs = UDSL_DEFAULT_SND_URBS;
 114 static unsigned int rcv_buf_size = UDSL_DEFAULT_RCV_BUF_SIZE;
 115 static unsigned int snd_buf_size = UDSL_DEFAULT_SND_BUF_SIZE;
 116
 117 module_param(num_rcv_urbs, uint, S_IRUGO);
 118 MODULE_PARM_DESC(num_rcv_urbs,
 119                  "Number of urbs used for reception (range: 0-"
 120                  __MODULE_STRING(UDSL_MAX_RCV_URBS) ", default: "
 121                  __MODULE_STRING(UDSL_DEFAULT_RCV_URBS) ")");
 122
 123 module_param(num_snd_urbs, uint, S_IRUGO);
 124 MODULE_PARM_DESC(num_snd_urbs,
 125                  "Number of urbs used for transmission (range: 0-"
 126                  __MODULE_STRING(UDSL_MAX_SND_URBS) ", default: "
 127                  __MODULE_STRING(UDSL_DEFAULT_SND_URBS) ")");
 128
 129 module_param(rcv_buf_size, uint, S_IRUGO);
 130 MODULE_PARM_DESC(rcv_buf_size,
 131                  "Size of the buffers used for reception in ATM cells (range: 1-"
 132                  __MODULE_STRING(UDSL_MAX_RCV_BUF_SIZE) ", default: "
 133                  __MODULE_STRING(UDSL_DEFAULT_RCV_BUF_SIZE) ")");
 134
 135 module_param(snd_buf_size, uint, S_IRUGO);
 136 MODULE_PARM_DESC(snd_buf_size,
 137                  "Size of the buffers used for transmission in ATM cells (range: 1-"
 138                  __MODULE_STRING(UDSL_MAX_SND_BUF_SIZE) ", default: "
 139                  __MODULE_STRING(UDSL_DEFAULT_SND_BUF_SIZE) ")");
 140
 141
 142 /* receive */
 143
 144 struct usbatm_vcc_data {
 145         /* vpi/vci lookup */
 146         struct list_head list;
 147         short vpi;
 148         int vci;
 149         struct atm_vcc *vcc;
 150
 151         /* raw cell reassembly */
 152         struct sk_buff *sarb;
 153 };
 154
 155
 156 /* send */
 157
 158 struct usbatm_control {
 159         struct atm_skb_data atm;
 160         u32 len;
 161         u32 crc;
 162 };
 163
 164 #define UDSL_SKB(x)             ((struct usbatm_control *)(x)->cb)
 165
 166
 167 /* ATM */
 168
 169 static void usbatm_atm_dev_close(struct atm_dev *atm_dev);
 170 static int usbatm_atm_open(struct atm_vcc *vcc);
 171 static void usbatm_atm_close(struct atm_vcc *vcc);
 172 static int usbatm_atm_ioctl(struct atm_dev *atm_dev, unsigned int cmd, void __user * arg);
 173 static int usbatm_atm_send(struct atm_vcc *vcc, struct sk_buff *skb);
 174 static int usbatm_atm_proc_read(struct atm_dev *atm_dev, loff_t * pos, char *page);
 175
 176 static struct atmdev_ops usbatm_atm_devops = {
 177         .dev_close      = usbatm_atm_dev_close,
 178         .open           = usbatm_atm_open,
 179         .close          = usbatm_atm_close,
 180         .ioctl          = usbatm_atm_ioctl,
 181         .send           = usbatm_atm_send,
 182         .proc_read      = usbatm_atm_proc_read,
 183         .owner          = THIS_MODULE,
 184 };
 185
 186
 187 /***********
 188 **  misc  **
 189 ***********/
 190
 191 static inline unsigned int usbatm_pdu_length(unsigned int length)
 192 {
 193         length += ATM_CELL_PAYLOAD - 1 + ATM_AAL5_TRAILER;
 194         return length - length % ATM_CELL_PAYLOAD;
 195 }
 196
 197 static inline void usbatm_pop(struct atm_vcc *vcc, struct sk_buff *skb)
 198 {
 199         if (vcc->pop)
 200                 vcc->pop(vcc, skb);
 201         else
 202                 dev_kfree_skb(skb);
 203 }
 204
 205
 206 /***********
 207 **  urbs  **
 208 ************/
 209
 210 static struct urb *usbatm_pop_urb(struct usbatm_channel *channel)
 211 {
 212         struct urb *urb;
 213
 214         spin_lock_irq(&channel->lock);
 215         if (list_empty(&channel->list)) {
 216                 spin_unlock_irq(&channel->lock);
 217                 return NULL;
 218         }
 219
 220         urb = list_entry(channel->list.next, struct urb, urb_list);
 221         list_del(&urb->urb_list);
 222         spin_unlock_irq(&channel->lock);
 223
 224         return urb;
 225 }
 226
 227 static int usbatm_submit_urb(struct urb *urb)
 228 {
 229         struct usbatm_channel *channel = urb->context;
 230         int ret;
 231
 232         vdbg("%s: submitting urb 0x%p, size %u",
 233              __func__, urb, urb->transfer_buffer_length);
 234
 235         ret = usb_submit_urb(urb, GFP_ATOMIC);
 236         if (ret) {
 237                 if (printk_ratelimit())
 238                         atm_warn(channel->usbatm, "%s: urb 0x%p submission failed (%d)!\n",
 239                                 __func__, urb, ret);
 240
 241                 /* consider all errors transient and return the buffer back to the queue */
 242                 urb->status = -EAGAIN;
 243                 spin_lock_irq(&channel->lock);
 244
 245                 /* must add to the front when sending; doesn't matter when receiving */
 246                 list_add(&urb->urb_list, &channel->list);
 247
 248                 spin_unlock_irq(&channel->lock);
 249
 250                 /* make sure the channel doesn't stall */
 251                 mod_timer(&channel->delay, jiffies + msecs_to_jiffies(THROTTLE_MSECS));
 252         }
 253
 254         return ret;
 255 }
 256
 257 static void usbatm_complete(struct urb *urb, struct pt_regs *regs)
 258 {
 259         struct usbatm_channel *channel = urb->context;
 260         unsigned long flags;
 261
 262         vdbg("%s: urb 0x%p, status %d, actual_length %d",
 263              __func__, urb, urb->status, urb->actual_length);
 264
 265         /* usually in_interrupt(), but not always */
 266         spin_lock_irqsave(&channel->lock, flags);
 267
 268         /* must add to the back when receiving; doesn't matter when sending */
 269         list_add_tail(&urb->urb_list, &channel->list);
 270
 271         spin_unlock_irqrestore(&channel->lock, flags);
 272
 273         if (unlikely(urb->status)) {
 274                 if (printk_ratelimit())
 275                         atm_warn(channel->usbatm, "%s: urb 0x%p failed (%d)!\n",
 276                                 __func__, urb, urb->status);
 277                 /* throttle processing in case of an error */
 278                 mod_timer(&channel->delay, jiffies + msecs_to_jiffies(THROTTLE_MSECS));
 279         } else
 280                 tasklet_schedule(&channel->tasklet);
 281 }
 282
 283
 284 /*************
 285 **  decode  **
 286 *************/
 287
 288 static inline struct usbatm_vcc_data *usbatm_find_vcc(struct usbatm_data *instance,
 289                                                   short vpi, int vci)
 290 {
 291         struct usbatm_vcc_data *vcc_data;
 292
 293         list_for_each_entry(vcc_data, &instance->vcc_list, list)
 294                 if ((vcc_data->vci == vci) && (vcc_data->vpi == vpi))
 295                         return vcc_data;
 296         return NULL;
 297 }
 298
 299 static void usbatm_extract_cells(struct usbatm_data *instance,
 300                                unsigned char *source, unsigned int avail_data)
 301 {
 302         struct usbatm_vcc_data *cached_vcc = NULL;
 303         struct atm_vcc *vcc;
 304         struct sk_buff *sarb;
 305         unsigned int stride = instance->rx_channel.stride;
 306         int vci, cached_vci = 0;
 307         short vpi, cached_vpi = 0;
 308         u8 pti;
 309
 310         for (; avail_data >= stride; avail_data -= stride, source += stride) {
 311                 vpi = ((source[0] & 0x0f) << 4)  | (source[1] >> 4);
 312                 vci = ((source[1] & 0x0f) << 12) | (source[2] << 4) | (source[3] >> 4);
 313                 pti = ((source[3] & 0xe) >> 1);
 314
 315                 vdbg("%s: vpi %hd, vci %d, pti %d", __func__, vpi, vci, pti);
 316
 317                 if ((vci != cached_vci) || (vpi != cached_vpi)) {
 318                         cached_vpi = vpi;
 319                         cached_vci = vci;
 320
 321                         cached_vcc = usbatm_find_vcc(instance, vpi, vci);
 322
 323                         if (!cached_vcc)
 324                                 atm_rldbg(instance, "%s: unknown vpi/vci (%hd/%d)!\n", __func__, vpi, vci);
 325                 }
 326
 327                 if (!cached_vcc)
 328                         continue;
 329
 330                 vcc = cached_vcc->vcc;
 331
 332                 /* OAM F5 end-to-end */
 333                 if (pti == ATM_PTI_E2EF5) {
 334                         if (printk_ratelimit())
 335                                 atm_warn(instance, "%s: OAM not supported (vpi %d, vci %d)!\n",
 336                                         __func__, vpi, vci);
 337                         atomic_inc(&vcc->stats->rx_err);
 338                         continue;
 339                 }
 340
 341                 sarb = cached_vcc->sarb;
 342
 343                 if (sarb->tail + ATM_CELL_PAYLOAD > sarb->end) {
 344                         atm_rldbg(instance, "%s: buffer overrun (sarb->len %u, vcc: 0x%p)!\n",
 345                                         __func__, sarb->len, vcc);
 346                         /* discard cells already received */
 347                         skb_trim(sarb, 0);
 348                         UDSL_ASSERT(sarb->tail + ATM_CELL_PAYLOAD <= sarb->end);
 349                 }
 350
 351                 memcpy(sarb->tail, source + ATM_CELL_HEADER, ATM_CELL_PAYLOAD);
 352                 __skb_put(sarb, ATM_CELL_PAYLOAD);
 353
 354                 if (pti & 1) {
 355                         struct sk_buff *skb;
 356                         unsigned int length;
 357                         unsigned int pdu_length;
 358
 359                         length = (source[ATM_CELL_SIZE - 6] << 8) + source[ATM_CELL_SIZE - 5];
 360
 361                         /* guard against overflow */
 362                         if (length > ATM_MAX_AAL5_PDU) {
 363                                 atm_rldbg(instance, "%s: bogus length %u (vcc: 0x%p)!\n",
 364                                                 __func__, length, vcc);
 365                                 atomic_inc(&vcc->stats->rx_err);
 366                                 goto out;
 367                         }
 368
 369                         pdu_length = usbatm_pdu_length(length);
 370
 371                         if (sarb->len < pdu_length) {
 372                                 atm_rldbg(instance, "%s: bogus pdu_length %u (sarb->len: %u, vcc: 0x%p)!\n",
 373                                                 __func__, pdu_length, sarb->len, vcc);
 374                                 atomic_inc(&vcc->stats->rx_err);
 375                                 goto out;
 376                         }
 377
 378                         if (crc32_be(~0, sarb->tail - pdu_length, pdu_length) != 0xc704dd7b) {
 379                                 atm_rldbg(instance, "%s: packet failed crc check (vcc: 0x%p)!\n",
 380                                                 __func__, vcc);
 381                                 atomic_inc(&vcc->stats->rx_err);
 382                                 goto out;
 383                         }
 384
 385                         vdbg("%s: got packet (length: %u, pdu_length: %u, vcc: 0x%p)", __func__, length, pdu_length, vcc);
 386
 387                         if (!(skb = dev_alloc_skb(length))) {
 388                                 if (printk_ratelimit())
 389                                         atm_err(instance, "%s: no memory for skb (length: %u)!\n",
 390                                                         __func__, length);
 391                                 atomic_inc(&vcc->stats->rx_drop);
 392                                 goto out;
 393                         }
 394
 395                         vdbg("%s: allocated new sk_buff (skb: 0x%p, skb->truesize: %u)", __func__, skb, skb->truesize);
 396
 397                         if (!atm_charge(vcc, skb->truesize)) {
 398                                 atm_rldbg(instance, "%s: failed atm_charge (skb->truesize: %u)!\n",
 399                                                 __func__, skb->truesize);
 400                                 dev_kfree_skb(skb);
 401                                 goto out;       /* atm_charge increments rx_drop */
 402                         }
 403
 404                         memcpy(skb->data, sarb->tail - pdu_length, length);
 405                         __skb_put(skb, length);
 406
 407                         vdbg("%s: sending skb 0x%p, skb->len %u, skb->truesize %u",
 408                              __func__, skb, skb->len, skb->truesize);
 409
 410                         PACKETDEBUG(skb->data, skb->len);
 411
 412                         vcc->push(vcc, skb);
 413
 414                         atomic_inc(&vcc->stats->rx);
 415                 out:
 416                         skb_trim(sarb, 0);
 417                 }
 418         }
 419 }
 420
 421
 422 /*************
 423 **  encode  **
 424 *************/
 425
 426 static unsigned int usbatm_write_cells(struct usbatm_data *instance,
 427                                        struct sk_buff *skb,
 428                                        u8 *target, unsigned int avail_space)
 429 {
 430         struct usbatm_control *ctrl = UDSL_SKB(skb);
 431         struct atm_vcc *vcc = ctrl->atm.vcc;
 432         unsigned int num_written;
 433         unsigned int stride = instance->tx_channel.stride;
 434
 435         vdbg("%s: skb->len=%d, avail_space=%u", __func__, skb->len, avail_space);
 436         UDSL_ASSERT(!(avail_space % stride));
 437
 438         for (num_written = 0; num_written < avail_space && ctrl->len;
 439              num_written += stride, target += stride) {
 440                 unsigned int data_len = min_t(unsigned int, skb->len, ATM_CELL_PAYLOAD);
 441                 unsigned int left = ATM_CELL_PAYLOAD - data_len;
 442                 u8 *ptr = target;
 443
 444                 ptr[0] = vcc->vpi >> 4;
 445                 ptr[1] = (vcc->vpi << 4) | (vcc->vci >> 12);
 446                 ptr[2] = vcc->vci >> 4;
 447                 ptr[3] = vcc->vci << 4;
 448                 ptr[4] = 0xec;
 449                 ptr += ATM_CELL_HEADER;
 450
 451                 memcpy(ptr, skb->data, data_len);
 452                 ptr += data_len;
 453                 __skb_pull(skb, data_len);
 454
 455                 if(!left)
 456                         continue;
 457
 458                 memset(ptr, 0, left);
 459
 460                 if (left >= ATM_AAL5_TRAILER) { /* trailer will go in this cell */
 461                         u8 *trailer = target + ATM_CELL_SIZE - ATM_AAL5_TRAILER;
 462                         /* trailer[0] = 0;              UU = 0 */
 463                         /* trailer[1] = 0;              CPI = 0 */
 464                         trailer[2] = ctrl->len >> 8;
 465                         trailer[3] = ctrl->len;
 466
 467                         ctrl->crc = ~ crc32_be(ctrl->crc, ptr, left - 4);
 468
 469                         trailer[4] = ctrl->crc >> 24;
 470                         trailer[5] = ctrl->crc >> 16;
 471                         trailer[6] = ctrl->crc >> 8;
 472                         trailer[7] = ctrl->crc;
 473
 474                         target[3] |= 0x2;       /* adjust PTI */
 475
 476                         ctrl->len = 0;          /* tag this skb finished */
 477                 }
 478                 else
 479                         ctrl->crc = crc32_be(ctrl->crc, ptr, left);
 480         }
 481
 482         return num_written;
 483 }
 484
 485
 486 /**************
 487 **  receive  **
 488 **************/
 489
 490 static void usbatm_rx_process(unsigned long data)
 491 {
 492         struct usbatm_data *instance = (struct usbatm_data *)data;
 493         struct urb *urb;
 494
 495         while ((urb = usbatm_pop_urb(&instance->rx_channel))) {
 496                 vdbg("%s: processing urb 0x%p", __func__, urb);
 497
 498                 if (usb_pipeisoc(urb->pipe)) {
 499                         int i;
 500                         for (i = 0; i < urb->number_of_packets; i++)
 501                                 if (!urb->iso_frame_desc[i].status)
 502                                         usbatm_extract_cells(instance,
 503                                                              (u8 *)urb->transfer_buffer + urb->iso_frame_desc[i].offset,
 504                                                              urb->iso_frame_desc[i].actual_length);
 505                 }
 506                 else
 507                         if (!urb->status)
 508                                 usbatm_extract_cells(instance, urb->transfer_buffer, urb->actual_length);
 509
 510                 if (usbatm_submit_urb(urb))
 511                         return;
 512         }
 513 }
 514
 515
 516 /***********
 517 **  send  **
 518 ***********/
 519
 520 static void usbatm_tx_process(unsigned long data)
 521 {
 522         struct usbatm_data *instance = (struct usbatm_data *)data;
 523         struct sk_buff *skb = instance->current_skb;
 524         struct urb *urb = NULL;
 525         const unsigned int buf_size = instance->tx_channel.buf_size;
 526         unsigned int num_written = 0;
 527         u8 *buffer = NULL;
 528
 529         if (!skb)
 530                 skb = skb_dequeue(&instance->sndqueue);
 531
 532         while (skb) {
 533                 if (!urb) {
 534                         urb = usbatm_pop_urb(&instance->tx_channel);
 535                         if (!urb)
 536                                 break;          /* no more senders */
 537                         buffer = urb->transfer_buffer;
 538                         num_written = (urb->status == -EAGAIN) ?
 539                                 urb->transfer_buffer_length : 0;
 540                 }
 541
 542                 num_written += usbatm_write_cells(instance, skb,
 543                                                   buffer + num_written,
 544                                                   buf_size - num_written);
 545
 546                 vdbg("%s: wrote %u bytes from skb 0x%p to urb 0x%p",
 547                      __func__, num_written, skb, urb);
 548
 549                 if (!UDSL_SKB(skb)->len) {
 550                         struct atm_vcc *vcc = UDSL_SKB(skb)->atm.vcc;
 551
 552                         usbatm_pop(vcc, skb);
 553                         atomic_inc(&vcc->stats->tx);
 554
 555                         skb = skb_dequeue(&instance->sndqueue);
 556                 }
 557
 558                 if (num_written == buf_size || (!skb && num_written)) {
 559                         urb->transfer_buffer_length = num_written;
 560
 561                         if (usbatm_submit_urb(urb))
 562                                 break;
 563                         urb = NULL;
 564                 }
 565         }
 566
 567         instance->current_skb = skb;
 568 }
 569
 570 static void usbatm_cancel_send(struct usbatm_data *instance,
 571                                struct atm_vcc *vcc)
 572 {
 573         struct sk_buff *skb, *n;
 574
 575         atm_dbg(instance, "%s entered\n", __func__);
 576         spin_lock_irq(&instance->sndqueue.lock);
 577         for (skb = instance->sndqueue.next, n = skb->next;
 578              skb != (struct sk_buff *)&instance->sndqueue;
 579              skb = n, n = skb->next)
 580                 if (UDSL_SKB(skb)->atm.vcc == vcc) {
 581                         atm_dbg(instance, "%s: popping skb 0x%p\n", __func__, skb);
 582                         __skb_unlink(skb, &instance->sndqueue);
 583                         usbatm_pop(vcc, skb);
 584                 }
 585         spin_unlock_irq(&instance->sndqueue.lock);
 586
 587         tasklet_disable(&instance->tx_channel.tasklet);
 588         if ((skb = instance->current_skb) && (UDSL_SKB(skb)->atm.vcc == vcc)) {
 589                 atm_dbg(instance, "%s: popping current skb (0x%p)\n", __func__, skb);
 590                 instance->current_skb = NULL;
 591                 usbatm_pop(vcc, skb);
 592         }
 593         tasklet_enable(&instance->tx_channel.tasklet);
 594         atm_dbg(instance, "%s done\n", __func__);
 595 }
 596
 597 static int usbatm_atm_send(struct atm_vcc *vcc, struct sk_buff *skb)
 598 {
 599         struct usbatm_data *instance = vcc->dev->dev_data;
 600         struct usbatm_control *ctrl = UDSL_SKB(skb);
 601         int err;
 602
 603         vdbg("%s called (skb 0x%p, len %u)", __func__, skb, skb->len);
 604
 605         if (!instance) {
 606                 dbg("%s: NULL data!", __func__);
 607                 err = -ENODEV;
 608                 goto fail;
 609         }
 610
 611         if (vcc->qos.aal != ATM_AAL5) {
 612                 atm_rldbg(instance, "%s: unsupported ATM type %d!\n", __func__, vcc->qos.aal);
 613                 err = -EINVAL;
 614                 goto fail;
 615         }
 616
 617         if (skb->len > ATM_MAX_AAL5_PDU) {
 618                 atm_rldbg(instance, "%s: packet too long (%d vs %d)!\n",
 619                                 __func__, skb->len, ATM_MAX_AAL5_PDU);
 620                 err = -EINVAL;
 621                 goto fail;
 622         }
 623
 624         PACKETDEBUG(skb->data, skb->len);
 625
 626         /* initialize the control block */
 627         ctrl->atm.vcc = vcc;
 628         ctrl->len = skb->len;
 629         ctrl->crc = crc32_be(~0, skb->data, skb->len);
 630
 631         skb_queue_tail(&instance->sndqueue, skb);
 632         tasklet_schedule(&instance->tx_channel.tasklet);
 633
 634         return 0;
 635
 636  fail:
 637         usbatm_pop(vcc, skb);
 638         return err;
 639 }
 640
 641
 642 /********************
 643 **  bean counting  **
 644 ********************/
 645
 646 static void usbatm_destroy_instance(struct kref *kref)
 647 {
 648         struct usbatm_data *instance = container_of(kref, struct usbatm_data, refcount);
 649
 650         dbg("%s", __func__);
 651
 652         tasklet_kill(&instance->rx_channel.tasklet);
 653         tasklet_kill(&instance->tx_channel.tasklet);
 654         usb_put_dev(instance->usb_dev);
 655         kfree(instance);
 656 }
 657
 658 static void usbatm_get_instance(struct usbatm_data *instance)
 659 {
 660         dbg("%s", __func__);
 661
 662         kref_get(&instance->refcount);
 663 }
 664
 665 static void usbatm_put_instance(struct usbatm_data *instance)
 666 {
 667         dbg("%s", __func__);
 668
 669         kref_put(&instance->refcount, usbatm_destroy_instance);
 670 }
 671
 672
 673 /**********
 674 **  ATM  **
 675 **********/
 676
 677 static void usbatm_atm_dev_close(struct atm_dev *atm_dev)
 678 {
 679         struct usbatm_data *instance = atm_dev->dev_data;
 680
 681         dbg("%s", __func__);
 682
 683         if (!instance)
 684                 return;
 685
 686         atm_dev->dev_data = NULL; /* catch bugs */
 687         usbatm_put_instance(instance);  /* taken in usbatm_atm_init */
 688 }
 689
 690 static int usbatm_atm_proc_read(struct atm_dev *atm_dev, loff_t * pos, char *page)
 691 {
 692         struct usbatm_data *instance = atm_dev->dev_data;
 693         int left = *pos;
 694
 695         if (!instance) {
 696                 dbg("%s: NULL instance!", __func__);
 697                 return -ENODEV;
 698         }
 699
 700         if (!left--)
 701                 return sprintf(page, "%s\n", instance->description);
 702
 703         if (!left--)
 704                 return sprintf(page, "MAC: %02x:%02x:%02x:%02x:%02x:%02x\n",
 705                                atm_dev->esi[0], atm_dev->esi[1],
 706                                atm_dev->esi[2], atm_dev->esi[3],
 707                                atm_dev->esi[4], atm_dev->esi[5]);
 708
 709         if (!left--)
 710                 return sprintf(page,
 711                                "AAL5: tx %d ( %d err ), rx %d ( %d err, %d drop )\n",
 712                                atomic_read(&atm_dev->stats.aal5.tx),
 713                                atomic_read(&atm_dev->stats.aal5.tx_err),
 714                                atomic_read(&atm_dev->stats.aal5.rx),
 715                                atomic_read(&atm_dev->stats.aal5.rx_err),
 716                                atomic_read(&atm_dev->stats.aal5.rx_drop));
 717
 718         if (!left--)
 719                 switch (atm_dev->signal) {
 720                 case ATM_PHY_SIG_FOUND:
 721                         return sprintf(page, "Line up\n");
 722                 case ATM_PHY_SIG_LOST:
 723                         return sprintf(page, "Line down\n");
 724                 default:
 725                         return sprintf(page, "Line state unknown\n");
 726                 }
 727
 728         return 0;
 729 }
 730
 731 static int usbatm_atm_open(struct atm_vcc *vcc)
 732 {
 733         struct usbatm_data *instance = vcc->dev->dev_data;
 734         struct usbatm_vcc_data *new = NULL;
 735         int ret;
 736         int vci = vcc->vci;
 737         short vpi = vcc->vpi;
 738
 739         if (!instance) {
 740                 dbg("%s: NULL data!", __func__);
 741                 return -ENODEV;
 742         }
 743
 744         atm_dbg(instance, "%s: vpi %hd, vci %d\n", __func__, vpi, vci);
 745
 746         /* only support AAL5 */
 747         if ((vcc->qos.aal != ATM_AAL5)) {
 748                 atm_warn(instance, "%s: unsupported ATM type %d!\n", __func__, vcc->qos.aal);
 749                 return -EINVAL;
 750         }
 751
 752         /* sanity checks */
 753         if ((vcc->qos.rxtp.max_sdu < 0) || (vcc->qos.rxtp.max_sdu > ATM_MAX_AAL5_PDU)) {
 754                 atm_dbg(instance, "%s: max_sdu %d out of range!\n", __func__, vcc->qos.rxtp.max_sdu);
 755                 return -EINVAL;
 756         }
 757
 758         down(&instance->serialize);     /* vs self, usbatm_atm_close, usbatm_usb_disconnect */
 759
 760         if (usbatm_find_vcc(instance, vpi, vci)) {
 761                 atm_dbg(instance, "%s: %hd/%d already in use!\n", __func__, vpi, vci);
 762                 ret = -EADDRINUSE;
 763                 goto fail;
 764         }
 765
 766         if (!(new = kmalloc(sizeof(struct usbatm_vcc_data), GFP_KERNEL))) {
 767                 atm_err(instance, "%s: no memory for vcc_data!\n", __func__);
 768                 ret = -ENOMEM;
 769                 goto fail;
 770         }
 771
 772         memset(new, 0, sizeof(struct usbatm_vcc_data));
 773         new->vcc = vcc;
 774         new->vpi = vpi;
 775         new->vci = vci;
 776
 777         new->sarb = alloc_skb(usbatm_pdu_length(vcc->qos.rxtp.max_sdu), GFP_KERNEL);
 778         if (!new->sarb) {
 779                 atm_err(instance, "%s: no memory for SAR buffer!\n", __func__);
 780                 ret = -ENOMEM;
 781                 goto fail;
 782         }
 783
 784         vcc->dev_data = new;
 785
 786         tasklet_disable(&instance->rx_channel.tasklet);
 787         list_add(&new->list, &instance->vcc_list);
 788         tasklet_enable(&instance->rx_channel.tasklet);
 789
 790         set_bit(ATM_VF_ADDR, &vcc->flags);
 791         set_bit(ATM_VF_PARTIAL, &vcc->flags);
 792         set_bit(ATM_VF_READY, &vcc->flags);
 793
 794         up(&instance->serialize);
 795
 796         atm_dbg(instance, "%s: allocated vcc data 0x%p\n", __func__, new);
 797
 798         return 0;
 799
 800 fail:
 801         kfree(new);
 802         up(&instance->serialize);
 803         return ret;
 804 }
 805
 806 static void usbatm_atm_close(struct atm_vcc *vcc)
 807 {
 808         struct usbatm_data *instance = vcc->dev->dev_data;
 809         struct usbatm_vcc_data *vcc_data = vcc->dev_data;
 810
 811         if (!instance || !vcc_data) {
 812                 dbg("%s: NULL data!", __func__);
 813                 return;
 814         }
 815
 816         atm_dbg(instance, "%s entered\n", __func__);
 817
 818         atm_dbg(instance, "%s: deallocating vcc 0x%p with vpi %d vci %d\n",
 819                 __func__, vcc_data, vcc_data->vpi, vcc_data->vci);
 820
 821         usbatm_cancel_send(instance, vcc);
 822
 823         down(&instance->serialize);     /* vs self, usbatm_atm_open, usbatm_usb_disconnect */
 824
 825         tasklet_disable(&instance->rx_channel.tasklet);
 826         list_del(&vcc_data->list);
 827         tasklet_enable(&instance->rx_channel.tasklet);
 828
 829         kfree_skb(vcc_data->sarb);
 830         vcc_data->sarb = NULL;
 831
 832         kfree(vcc_data);
 833         vcc->dev_data = NULL;
 834
 835         vcc->vpi = ATM_VPI_UNSPEC;
 836         vcc->vci = ATM_VCI_UNSPEC;
 837         clear_bit(ATM_VF_READY, &vcc->flags);
 838         clear_bit(ATM_VF_PARTIAL, &vcc->flags);
 839         clear_bit(ATM_VF_ADDR, &vcc->flags);
 840
 841         up(&instance->serialize);
 842
 843         atm_dbg(instance, "%s successful\n", __func__);
 844 }
 845
 846 static int usbatm_atm_ioctl(struct atm_dev *atm_dev, unsigned int cmd,
 847                           void __user * arg)
 848 {
 849         switch (cmd) {
 850         case ATM_QUERYLOOP:
 851                 return put_user(ATM_LM_NONE, (int __user *)arg) ? -EFAULT : 0;
 852         default:
 853                 return -ENOIOCTLCMD;
 854         }
 855 }
 856
 857 static int usbatm_atm_init(struct usbatm_data *instance)
 858 {
 859         struct atm_dev *atm_dev;
 860         int ret, i;
 861
 862         /* ATM init.  The ATM initialization scheme suffers from an intrinsic race
 863          * condition: callbacks we register can be executed at once, before we have
 864          * initialized the struct atm_dev.  To protect against this, all callbacks
 865          * abort if atm_dev->dev_data is NULL. */
 866         atm_dev = atm_dev_register(instance->driver_name, &usbatm_atm_devops, -1, NULL);
 867         if (!atm_dev) {
 868                 usb_err(instance, "%s: failed to register ATM device!\n", __func__);
 869                 return -1;
 870         }
 871
 872         instance->atm_dev = atm_dev;
 873
 874         atm_dev->ci_range.vpi_bits = ATM_CI_MAX;
 875         atm_dev->ci_range.vci_bits = ATM_CI_MAX;
 876         atm_dev->signal = ATM_PHY_SIG_UNKNOWN;
 877
 878         /* temp init ATM device, set to 128kbit */
 879         atm_dev->link_rate = 128 * 1000 / 424;
 880
 881         if (instance->driver->atm_start && ((ret = instance->driver->atm_start(instance, atm_dev)) < 0)) {
 882                 atm_err(instance, "%s: atm_start failed: %d!\n", __func__, ret);
 883                 goto fail;
 884         }
 885
 886         usbatm_get_instance(instance);  /* dropped in usbatm_atm_dev_close */
 887
 888         /* ready for ATM callbacks */
 889         mb();
 890         atm_dev->dev_data = instance;
 891
 892         /* submit all rx URBs */
 893         for (i = 0; i < num_rcv_urbs; i++)
 894                 usbatm_submit_urb(instance->urbs[i]);
 895
 896         return 0;
 897
 898  fail:
 899         instance->atm_dev = NULL;
 900         atm_dev_deregister(atm_dev); /* usbatm_atm_dev_close will eventually be called */
 901         return ret;
 902 }
 903
 904
 905 /**********
 906 **  USB  **
 907 **********/
 908
 909 static int usbatm_do_heavy_init(void *arg)
 910 {
 911         struct usbatm_data *instance = arg;
 912         int ret;
 913
 914         daemonize(instance->driver->driver_name);
 915         allow_signal(SIGTERM);
 916
 917         complete(&instance->thread_started);
 918
 919         ret = instance->driver->heavy_init(instance, instance->usb_intf);
 920
 921         if (!ret)
 922                 ret = usbatm_atm_init(instance);
 923
 924         down(&instance->serialize);
 925         instance->thread_pid = -1;
 926         up(&instance->serialize);
 927
 928         complete_and_exit(&instance->thread_exited, ret);
 929 }
 930
 931 static int usbatm_heavy_init(struct usbatm_data *instance)
 932 {
 933         int ret = kernel_thread(usbatm_do_heavy_init, instance, CLONE_KERNEL);
 934
 935         if (ret < 0) {
 936                 usb_err(instance, "%s: failed to create kernel_thread (%d)!\n", __func__, ret);
 937                 return ret;
 938         }
 939
 940         down(&instance->serialize);
 941         instance->thread_pid = ret;
 942         up(&instance->serialize);
 943
 944         wait_for_completion(&instance->thread_started);
 945
 946         return 0;
 947 }
 948
 949 static void usbatm_tasklet_schedule(unsigned long data)
 950 {
 951         tasklet_schedule((struct tasklet_struct *) data);
 952 }
 953
 954 static inline void usbatm_init_channel(struct usbatm_channel *channel)
 955 {
 956         spin_lock_init(&channel->lock);
 957         INIT_LIST_HEAD(&channel->list);
 958         channel->delay.function = usbatm_tasklet_schedule;
 959         channel->delay.data = (unsigned long) &channel->tasklet;
 960         init_timer(&channel->delay);
 961 }
 962
 963 int usbatm_usb_probe(struct usb_interface *intf, const struct usb_device_id *id,
 964                      struct usbatm_driver *driver)
 965 {
 966         struct device *dev = &intf->dev;
 967         struct usb_device *usb_dev = interface_to_usbdev(intf);
 968         struct usbatm_data *instance;
 969         char *buf;
 970         int error = -ENOMEM;
 971         int i, length;
 972         int need_heavy;
 973
 974         dev_dbg(dev, "%s: trying driver %s with vendor=%04x, product=%04x, ifnum %2d\n",
 975                         __func__, driver->driver_name,
 976                         le16_to_cpu(usb_dev->descriptor.idVendor),
 977                         le16_to_cpu(usb_dev->descriptor.idProduct),
 978                         intf->altsetting->desc.bInterfaceNumber);
 979
 980         /* instance init */
 981         instance = kzalloc(sizeof(*instance) + sizeof(struct urb *) * (num_rcv_urbs + num_snd_urbs), GFP_KERNEL);
 982         if (!instance) {
 983                 dev_err(dev, "%s: no memory for instance data!\n", __func__);
 984                 return -ENOMEM;
 985         }
 986
 987         /* public fields */
 988
 989         instance->driver = driver;
 990         snprintf(instance->driver_name, sizeof(instance->driver_name), driver->driver_name);
 991
 992         instance->usb_dev = usb_dev;
 993         instance->usb_intf = intf;
 994
 995         buf = instance->description;
 996         length = sizeof(instance->description);
 997
 998         if ((i = usb_string(usb_dev, usb_dev->descriptor.iProduct, buf, length)) < 0)
 999                 goto bind;
1000
1001         buf += i;
1002         length -= i;
1003
1004         i = scnprintf(buf, length, " (");
1005         buf += i;
1006         length -= i;
1007
1008         if (length <= 0 || (i = usb_make_path(usb_dev, buf, length)) < 0)
1009                 goto bind;
1010
1011         buf += i;
1012         length -= i;
1013
1014         snprintf(buf, length, ")");
1015
1016  bind:
1017         need_heavy = 1;
1018         if (driver->bind && (error = driver->bind(instance, intf, id, &need_heavy)) < 0) {
1019                         dev_err(dev, "%s: bind failed: %d!\n", __func__, error);
1020                         goto fail_free;
1021         }
1022
1023         /* private fields */
1024
1025         kref_init(&instance->refcount);         /* dropped in usbatm_usb_disconnect */
1026         init_MUTEX(&instance->serialize);
1027
1028         instance->thread_pid = -1;
1029         init_completion(&instance->thread_started);
1030         init_completion(&instance->thread_exited);
1031
1032         INIT_LIST_HEAD(&instance->vcc_list);
1033
1034         usbatm_init_channel(&instance->rx_channel);
1035         usbatm_init_channel(&instance->tx_channel);
1036         tasklet_init(&instance->rx_channel.tasklet, usbatm_rx_process, (unsigned long)instance);
1037         tasklet_init(&instance->tx_channel.tasklet, usbatm_tx_process, (unsigned long)instance);
1038         instance->rx_channel.endpoint = usb_rcvbulkpipe(usb_dev, driver->in);
1039         instance->tx_channel.endpoint = usb_sndbulkpipe(usb_dev, driver->out);
1040         instance->rx_channel.stride = ATM_CELL_SIZE + driver->rx_padding;
1041         instance->tx_channel.stride = ATM_CELL_SIZE + driver->tx_padding;
1042         instance->rx_channel.buf_size = rcv_buf_size * instance->rx_channel.stride;
1043         instance->tx_channel.buf_size = snd_buf_size * instance->tx_channel.stride;
1044         instance->rx_channel.usbatm = instance->tx_channel.usbatm = instance;
1045
1046         skb_queue_head_init(&instance->sndqueue);
1047
1048         for (i = 0; i < num_rcv_urbs + num_snd_urbs; i++) {
1049                 struct urb *urb;
1050                 u8 *buffer;
1051                 unsigned int iso_packets = 0, iso_size = 0;
1052                 struct usbatm_channel *channel = i < num_rcv_urbs ?
1053                         &instance->rx_channel : &instance->tx_channel;
1054
1055                 if (usb_pipeisoc(channel->endpoint)) {
1056                         /* don't expect iso out endpoints */
1057                         iso_size = usb_maxpacket(instance->usb_dev, channel->endpoint, 0);
1058                         iso_size -= iso_size % channel->stride; /* alignment */
1059                         BUG_ON(!iso_size);
1060                         iso_packets = (channel->buf_size - 1) / iso_size + 1;
1061                 }
1062
1063                 urb = usb_alloc_urb(iso_packets, GFP_KERNEL);
1064                 if (!urb) {
1065                         dev_err(dev, "%s: no memory for urb %d!\n", __func__, i);
1066                         goto fail_unbind;
1067                 }
1068
1069                 instance->urbs[i] = urb;
1070
1071                 buffer = kmalloc(channel->buf_size, GFP_KERNEL);
1072                 if (!buffer) {
1073                         dev_err(dev, "%s: no memory for buffer %d!\n", __func__, i);
1074                         goto fail_unbind;
1075                 }
1076                 /* zero the tx padding to avoid leaking information */
1077                 memset(buffer, 0, channel->buf_size);
1078
1079                 usb_fill_bulk_urb(urb, instance->usb_dev, channel->endpoint,
1080                                   buffer, channel->buf_size, usbatm_complete, channel);
1081                 if (iso_packets) {
1082                         int j;
1083                         urb->interval = 1;
1084                         urb->transfer_flags = URB_ISO_ASAP;
1085                         urb->number_of_packets = iso_packets;
1086                         for (j = 0; j < iso_packets; j++) {
1087                                 urb->iso_frame_desc[j].offset = iso_size * j;
1088                                 urb->iso_frame_desc[j].length = min_t(int, iso_size,
1089                                                                       channel->buf_size - urb->iso_frame_desc[j].offset);
1090                         }
1091                 }
1092
1093                 /* put all tx URBs on the list of spares */
1094                 if (i >= num_rcv_urbs)
1095                         list_add_tail(&urb->urb_list, &channel->list);
1096
1097                 vdbg("%s: alloced buffer 0x%p buf size %u urb 0x%p",
1098                      __func__, urb->transfer_buffer, urb->transfer_buffer_length, urb);
1099         }
1100
1101         if (need_heavy && driver->heavy_init) {
1102                 error = usbatm_heavy_init(instance);
1103         } else {
1104                 complete(&instance->thread_exited);     /* pretend that heavy_init was run */
1105                 error = usbatm_atm_init(instance);
1106         }
1107
1108         if (error < 0)
1109                 goto fail_unbind;
1110
1111         usb_get_dev(usb_dev);
1112         usb_set_intfdata(intf, instance);
1113
1114         return 0;
1115
1116  fail_unbind:
1117         if (instance->driver->unbind)
1118                 instance->driver->unbind(instance, intf);
1119  fail_free:
1120         for (i = 0; i < num_rcv_urbs + num_snd_urbs; i++) {
1121                 if (instance->urbs[i])
1122                         kfree(instance->urbs[i]->transfer_buffer);
1123                 usb_free_urb(instance->urbs[i]);
1124         }
1125
1126         kfree (instance);
1127
1128         return error;
1129 }
1130 EXPORT_SYMBOL_GPL(usbatm_usb_probe);
1131
1132 void usbatm_usb_disconnect(struct usb_interface *intf)
1133 {
1134         struct device *dev = &intf->dev;
1135         struct usbatm_data *instance = usb_get_intfdata(intf);
1136         int i;
1137
1138         dev_dbg(dev, "%s entered\n", __func__);
1139
1140         if (!instance) {
1141                 dev_dbg(dev, "%s: NULL instance!\n", __func__);
1142                 return;
1143         }
1144
1145         usb_set_intfdata(intf, NULL);
1146
1147         down(&instance->serialize);
1148         if (instance->thread_pid >= 0)
1149                 kill_proc(instance->thread_pid, SIGTERM, 1);
1150         up(&instance->serialize);
1151
1152         wait_for_completion(&instance->thread_exited);
1153
1154         tasklet_disable(&instance->rx_channel.tasklet);
1155         tasklet_disable(&instance->tx_channel.tasklet);
1156
1157         for (i = 0; i < num_rcv_urbs + num_snd_urbs; i++)
1158                 usb_kill_urb(instance->urbs[i]);
1159
1160         del_timer_sync(&instance->rx_channel.delay);
1161         del_timer_sync(&instance->tx_channel.delay);
1162
1163         if (instance->atm_dev && instance->driver->atm_stop)
1164                 instance->driver->atm_stop(instance, instance->atm_dev);
1165
1166         if (instance->driver->unbind)
1167                 instance->driver->unbind(instance, intf);
1168
1169         instance->driver_data = NULL;
1170
1171         /* turn usbatm_[rt]x_process into noop */
1172         /* no need to take the spinlock */
1173         INIT_LIST_HEAD(&instance->rx_channel.list);
1174         INIT_LIST_HEAD(&instance->tx_channel.list);
1175
1176         tasklet_enable(&instance->rx_channel.tasklet);
1177         tasklet_enable(&instance->tx_channel.tasklet);
1178
1179         for (i = 0; i < num_rcv_urbs + num_snd_urbs; i++) {
1180                 kfree(instance->urbs[i]->transfer_buffer);
1181                 usb_free_urb(instance->urbs[i]);
1182         }
1183
1184         /* ATM finalize */
1185         if (instance->atm_dev)
1186                 atm_dev_deregister(instance->atm_dev);
1187
1188         usbatm_put_instance(instance);  /* taken in usbatm_usb_probe */
1189 }
1190 EXPORT_SYMBOL_GPL(usbatm_usb_disconnect);
1191
1192
1193 /***********
1194 **  init  **
1195 ***********/
1196
1197 static int __init usbatm_usb_init(void)
1198 {
1199         dbg("%s: driver version %s", __func__, DRIVER_VERSION);
1200
1201         if (sizeof(struct usbatm_control) > sizeof(((struct sk_buff *) 0)->cb)) {
1202                 printk(KERN_ERR "%s unusable with this kernel!\n", usbatm_driver_name);
1203                 return -EIO;
1204         }
1205
1206         if ((num_rcv_urbs > UDSL_MAX_RCV_URBS)
1207             || (num_snd_urbs > UDSL_MAX_SND_URBS)
1208             || (rcv_buf_size < 1)
1209             || (rcv_buf_size > UDSL_MAX_RCV_BUF_SIZE)
1210             || (snd_buf_size < 1)
1211             || (snd_buf_size > UDSL_MAX_SND_BUF_SIZE))
1212                 return -EINVAL;
1213
1214         return 0;
1215 }
1216 module_init(usbatm_usb_init);
1217
1218 static void __exit usbatm_usb_exit(void)
1219 {
1220         dbg("%s", __func__);
1221 }
1222 module_exit(usbatm_usb_exit);
1223
1224 MODULE_AUTHOR(DRIVER_AUTHOR);
1225 MODULE_DESCRIPTION(DRIVER_DESC);
1226 MODULE_LICENSE("GPL");
1227 MODULE_VERSION(DRIVER_VERSION);
1228
1229 /************
1230 **  debug  **
1231 ************/
1232
1233 #ifdef VERBOSE_DEBUG
1234 static int usbatm_print_packet(const unsigned char *data, int len)
1235 {
1236         unsigned char buffer[256];
1237         int i = 0, j = 0;
1238
1239         for (i = 0; i < len;) {
1240                 buffer[0] = '\0';
1241                 sprintf(buffer, "%.3d :", i);
1242                 for (j = 0; (j < 16) && (i < len); j++, i++) {
1243                         sprintf(buffer, "%s %2.2x", buffer, data[i]);
1244                 }
1245                 dbg("%s", buffer);
1246         }
1247         return i;
1248 }
1249 #endif