drivers/usb/atm/usbatm.c

   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 *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 *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 inline 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 inline 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                 atm_dbg(channel->usbatm, "%s: urb 0x%p submission failed (%d)!\n",
 238                         __func__, urb, ret);
 239
 240                 /* consider all errors transient and return the buffer back to the queue */
 241                 urb->status = -EAGAIN;
 242                 spin_lock_irq(&channel->lock);
 243
 244                 /* must add to the front when sending; doesn't matter when receiving */
 245                 list_add(&urb->urb_list, &channel->list);
 246
 247                 spin_unlock_irq(&channel->lock);
 248
 249                 /* make sure the channel doesn't stall */
 250                 mod_timer(&channel->delay, jiffies + msecs_to_jiffies(THROTTLE_MSECS));
 251         }
 252
 253         return ret;
 254 }
 255
 256 static void usbatm_complete(struct urb *urb, struct pt_regs *regs)
 257 {
 258         struct usbatm_channel *channel = urb->context;
 259         unsigned long flags;
 260
 261         vdbg("%s: urb 0x%p, status %d, actual_length %d",
 262              __func__, urb, urb->status, urb->actual_length);
 263
 264         /* usually in_interrupt(), but not always */
 265         spin_lock_irqsave(&channel->lock, flags);
 266
 267         /* must add to the back when receiving; doesn't matter when sending */
 268         list_add_tail(&urb->urb_list, &channel->list);
 269
 270         spin_unlock_irqrestore(&channel->lock, flags);
 271
 272         if (unlikely(urb->status))
 273                 /* throttle processing in case of an error */
 274                 mod_timer(&channel->delay, jiffies + msecs_to_jiffies(THROTTLE_MSECS));
 275         else
 276                 tasklet_schedule(&channel->tasklet);
 277 }
 278
 279
 280 /*************
 281 **  decode  **
 282 *************/
 283
 284 static inline struct usbatm_vcc_data *usbatm_find_vcc(struct usbatm_data *instance,
 285                                                   short vpi, int vci)
 286 {
 287         struct usbatm_vcc_data *vcc;
 288
 289         list_for_each_entry(vcc, &instance->vcc_list, list)
 290                 if ((vcc->vci == vci) && (vcc->vpi == vpi))
 291                         return vcc;
 292         return NULL;
 293 }
 294
 295 static void usbatm_extract_cells(struct usbatm_data *instance,
 296                                unsigned char *source, unsigned int avail_data)
 297 {
 298         struct usbatm_vcc_data *cached_vcc = NULL;
 299         struct atm_vcc *vcc;
 300         struct sk_buff *sarb;
 301         unsigned int stride = instance->rx_channel.stride;
 302         int vci, cached_vci = 0;
 303         short vpi, cached_vpi = 0;
 304         u8 pti;
 305
 306         for (; avail_data >= stride; avail_data -= stride, source += stride) {
 307                 vpi = ((source[0] & 0x0f) << 4)  | (source[1] >> 4);
 308                 vci = ((source[1] & 0x0f) << 12) | (source[2] << 4) | (source[3] >> 4);
 309                 pti = ((source[3] & 0xe) >> 1);
 310
 311                 vdbg("%s: vpi %hd, vci %d, pti %d", __func__, vpi, vci, pti);
 312
 313                 if ((vci != cached_vci) || (vpi != cached_vpi)) {
 314                         cached_vpi = vpi;
 315                         cached_vci = vci;
 316
 317                         cached_vcc = usbatm_find_vcc(instance, vpi, vci);
 318
 319                         if (!cached_vcc)
 320                                 atm_dbg(instance, "%s: unknown vpi/vci (%hd/%d)!\n", __func__, vpi, vci);
 321                 }
 322
 323                 if (!cached_vcc)
 324                         continue;
 325
 326                 vcc = cached_vcc->vcc;
 327
 328                 /* OAM F5 end-to-end */
 329                 if (pti == ATM_PTI_E2EF5) {
 330                         atm_warn(instance, "%s: OAM not supported (vpi %d, vci %d)!\n", __func__, vpi, vci);
 331                         atomic_inc(&vcc->stats->rx_err);
 332                         continue;
 333                 }
 334
 335                 sarb = cached_vcc->sarb;
 336
 337                 if (sarb->tail + ATM_CELL_PAYLOAD > sarb->end) {
 338                         atm_dbg(instance, "%s: buffer overrun (sarb->len %u, vcc: 0x%p)!\n",
 339                                         __func__, sarb->len, vcc);
 340                         /* discard cells already received */
 341                         skb_trim(sarb, 0);
 342                         UDSL_ASSERT(sarb->tail + ATM_CELL_PAYLOAD <= sarb->end);
 343                 }
 344
 345                 memcpy(sarb->tail, source + ATM_CELL_HEADER, ATM_CELL_PAYLOAD);
 346                 __skb_put(sarb, ATM_CELL_PAYLOAD);
 347
 348                 if (pti & 1) {
 349                         struct sk_buff *skb;
 350                         unsigned int length;
 351                         unsigned int pdu_length;
 352
 353                         length = (source[ATM_CELL_SIZE - 6] << 8) + source[ATM_CELL_SIZE - 5];
 354
 355                         /* guard against overflow */
 356                         if (length > ATM_MAX_AAL5_PDU) {
 357                                 atm_dbg(instance, "%s: bogus length %u (vcc: 0x%p)!\n",
 358                                                 __func__, length, vcc);
 359                                 atomic_inc(&vcc->stats->rx_err);
 360                                 goto out;
 361                         }
 362
 363                         pdu_length = usbatm_pdu_length(length);
 364
 365                         if (sarb->len < pdu_length) {
 366                                 atm_dbg(instance, "%s: bogus pdu_length %u (sarb->len: %u, vcc: 0x%p)!\n",
 367                                                 __func__, pdu_length, sarb->len, vcc);
 368                                 atomic_inc(&vcc->stats->rx_err);
 369                                 goto out;
 370                         }
 371
 372                         if (crc32_be(~0, sarb->tail - pdu_length, pdu_length) != 0xc704dd7b) {
 373                                 atm_dbg(instance, "%s: packet failed crc check (vcc: 0x%p)!\n",
 374                                                 __func__, vcc);
 375                                 atomic_inc(&vcc->stats->rx_err);
 376                                 goto out;
 377                         }
 378
 379                         vdbg("%s: got packet (length: %u, pdu_length: %u, vcc: 0x%p)", __func__, length, pdu_length, vcc);
 380
 381                         if (!(skb = dev_alloc_skb(length))) {
 382                                 atm_dbg(instance, "%s: no memory for skb (length: %u)!\n", __func__, length);
 383                                 atomic_inc(&vcc->stats->rx_drop);
 384                                 goto out;
 385                         }
 386
 387                         vdbg("%s: allocated new sk_buff (skb: 0x%p, skb->truesize: %u)", __func__, skb, skb->truesize);
 388
 389                         if (!atm_charge(vcc, skb->truesize)) {
 390                                 atm_dbg(instance, "%s: failed atm_charge (skb->truesize: %u)!\n", __func__, skb->truesize);
 391                                 dev_kfree_skb(skb);
 392                                 goto out;       /* atm_charge increments rx_drop */
 393                         }
 394
 395                         memcpy(skb->data, sarb->tail - pdu_length, length);
 396                         __skb_put(skb, length);
 397
 398                         vdbg("%s: sending skb 0x%p, skb->len %u, skb->truesize %u",
 399                              __func__, skb, skb->len, skb->truesize);
 400
 401                         PACKETDEBUG(skb->data, skb->len);
 402
 403                         vcc->push(vcc, skb);
 404
 405                         atomic_inc(&vcc->stats->rx);
 406                 out:
 407                         skb_trim(sarb, 0);
 408                 }
 409         }
 410 }
 411
 412
 413 /*************
 414 **  encode  **
 415 *************/
 416
 417 static unsigned int usbatm_write_cells(struct usbatm_data *instance,
 418                                        struct sk_buff *skb,
 419                                        u8 *target, unsigned int avail_space)
 420 {
 421         struct usbatm_control *ctrl = UDSL_SKB(skb);
 422         struct atm_vcc *vcc = ctrl->atm.vcc;
 423         unsigned int num_written;
 424         unsigned int stride = instance->tx_channel.stride;
 425
 426         vdbg("%s: skb->len=%d, avail_space=%u", __func__, skb->len, avail_space);
 427         UDSL_ASSERT(!(avail_space % stride));
 428
 429         for (num_written = 0; num_written < avail_space && ctrl->len;
 430              num_written += stride, target += stride) {
 431                 unsigned int data_len = min_t(unsigned int, skb->len, ATM_CELL_PAYLOAD);
 432                 unsigned int left = ATM_CELL_PAYLOAD - data_len;
 433                 u8 *ptr = target;
 434
 435                 ptr[0] = vcc->vpi >> 4;
 436                 ptr[1] = (vcc->vpi << 4) | (vcc->vci >> 12);
 437                 ptr[2] = vcc->vci >> 4;
 438                 ptr[3] = vcc->vci << 4;
 439                 ptr[4] = 0xec;
 440                 ptr += ATM_CELL_HEADER;
 441
 442                 memcpy(ptr, skb->data, data_len);
 443                 ptr += data_len;
 444                 __skb_pull(skb, data_len);
 445
 446                 if(!left)
 447                         continue;
 448
 449                 memset(ptr, 0, left);
 450
 451                 if (left >= ATM_AAL5_TRAILER) { /* trailer will go in this cell */
 452                         u8 *trailer = target + ATM_CELL_SIZE - ATM_AAL5_TRAILER;
 453                         /* trailer[0] = 0;              UU = 0 */
 454                         /* trailer[1] = 0;              CPI = 0 */
 455                         trailer[2] = ctrl->len >> 8;
 456                         trailer[3] = ctrl->len;
 457
 458                         ctrl->crc = ~ crc32_be(ctrl->crc, ptr, left - 4);
 459
 460                         trailer[4] = ctrl->crc >> 24;
 461                         trailer[5] = ctrl->crc >> 16;
 462                         trailer[6] = ctrl->crc >> 8;
 463                         trailer[7] = ctrl->crc;
 464
 465                         target[3] |= 0x2;       /* adjust PTI */
 466
 467                         ctrl->len = 0;          /* tag this skb finished */
 468                 }
 469                 else
 470                         ctrl->crc = crc32_be(ctrl->crc, ptr, left);
 471         }
 472
 473         return num_written;
 474 }
 475
 476
 477 /**************
 478 **  receive  **
 479 **************/
 480
 481 static void usbatm_rx_process(unsigned long data)
 482 {
 483         struct usbatm_data *instance = (struct usbatm_data *)data;
 484         struct urb *urb;
 485
 486         while ((urb = usbatm_pop_urb(&instance->rx_channel))) {
 487                 vdbg("%s: processing urb 0x%p", __func__, urb);
 488
 489                 if (usb_pipeisoc(urb->pipe)) {
 490                         int i;
 491                         for (i = 0; i < urb->number_of_packets; i++)
 492                                 if (!urb->iso_frame_desc[i].status)
 493                                         usbatm_extract_cells(instance,
 494                                                              (u8 *)urb->transfer_buffer + urb->iso_frame_desc[i].offset,
 495                                                              urb->iso_frame_desc[i].actual_length);
 496                 }
 497                 else
 498                         if (!urb->status)
 499                                 usbatm_extract_cells(instance, urb->transfer_buffer, urb->actual_length);
 500
 501                 if (usbatm_submit_urb(urb))
 502                         return;
 503         }
 504 }
 505
 506
 507 /***********
 508 **  send  **
 509 ***********/
 510
 511 static void usbatm_tx_process(unsigned long data)
 512 {
 513         struct usbatm_data *instance = (struct usbatm_data *)data;
 514         struct sk_buff *skb = instance->current_skb;
 515         struct urb *urb = NULL;
 516         const unsigned int buf_size = instance->tx_channel.buf_size;
 517         unsigned int num_written = 0;
 518         u8 *buffer = NULL;
 519
 520         if (!skb)
 521                 skb = skb_dequeue(&instance->sndqueue);
 522
 523         while (skb) {
 524                 if (!urb) {
 525                         urb = usbatm_pop_urb(&instance->tx_channel);
 526                         if (!urb)
 527                                 break;          /* no more senders */
 528                         buffer = urb->transfer_buffer;
 529                         num_written = (urb->status == -EAGAIN) ?
 530                                 urb->transfer_buffer_length : 0;
 531                 }
 532
 533                 num_written += usbatm_write_cells(instance, skb,
 534                                                   buffer + num_written,
 535                                                   buf_size - num_written);
 536
 537                 vdbg("%s: wrote %u bytes from skb 0x%p to urb 0x%p",
 538                      __func__, num_written, skb, urb);
 539
 540                 if (!UDSL_SKB(skb)->len) {
 541                         struct atm_vcc *vcc = UDSL_SKB(skb)->atm.vcc;
 542
 543                         usbatm_pop(vcc, skb);
 544                         atomic_inc(&vcc->stats->tx);
 545
 546                         skb = skb_dequeue(&instance->sndqueue);
 547                 }
 548
 549                 if (num_written == buf_size || (!skb && num_written)) {
 550                         urb->transfer_buffer_length = num_written;
 551
 552                         if (usbatm_submit_urb(urb))
 553                                 break;
 554                         urb = NULL;
 555                 }
 556         }
 557
 558         instance->current_skb = skb;
 559 }
 560
 561 static void usbatm_cancel_send(struct usbatm_data *instance,
 562                                struct atm_vcc *vcc)
 563 {
 564         struct sk_buff *skb, *n;
 565
 566         atm_dbg(instance, "%s entered\n", __func__);
 567         spin_lock_irq(&instance->sndqueue.lock);
 568         for (skb = instance->sndqueue.next, n = skb->next;
 569              skb != (struct sk_buff *)&instance->sndqueue;
 570              skb = n, n = skb->next)
 571                 if (UDSL_SKB(skb)->atm.vcc == vcc) {
 572                         atm_dbg(instance, "%s: popping skb 0x%p\n", __func__, skb);
 573                         __skb_unlink(skb, &instance->sndqueue);
 574                         usbatm_pop(vcc, skb);
 575                 }
 576         spin_unlock_irq(&instance->sndqueue.lock);
 577
 578         tasklet_disable(&instance->tx_channel.tasklet);
 579         if ((skb = instance->current_skb) && (UDSL_SKB(skb)->atm.vcc == vcc)) {
 580                 atm_dbg(instance, "%s: popping current skb (0x%p)\n", __func__, skb);
 581                 instance->current_skb = NULL;
 582                 usbatm_pop(vcc, skb);
 583         }
 584         tasklet_enable(&instance->tx_channel.tasklet);
 585         atm_dbg(instance, "%s done\n", __func__);
 586 }
 587
 588 static int usbatm_atm_send(struct atm_vcc *vcc, struct sk_buff *skb)
 589 {
 590         struct usbatm_data *instance = vcc->dev->dev_data;
 591         struct usbatm_control *ctrl = UDSL_SKB(skb);
 592         int err;
 593
 594         vdbg("%s called (skb 0x%p, len %u)", __func__, skb, skb->len);
 595
 596         if (!instance) {
 597                 dbg("%s: NULL data!", __func__);
 598                 err = -ENODEV;
 599                 goto fail;
 600         }
 601
 602         if (vcc->qos.aal != ATM_AAL5) {
 603                 atm_dbg(instance, "%s: unsupported ATM type %d!\n", __func__, vcc->qos.aal);
 604                 err = -EINVAL;
 605                 goto fail;
 606         }
 607
 608         if (skb->len > ATM_MAX_AAL5_PDU) {
 609                 atm_dbg(instance, "%s: packet too long (%d vs %d)!\n",
 610                                 __func__, skb->len, ATM_MAX_AAL5_PDU);
 611                 err = -EINVAL;
 612                 goto fail;
 613         }
 614
 615         PACKETDEBUG(skb->data, skb->len);
 616
 617         /* initialize the control block */
 618         ctrl->atm.vcc = vcc;
 619         ctrl->len = skb->len;
 620         ctrl->crc = crc32_be(~0, skb->data, skb->len);
 621
 622         skb_queue_tail(&instance->sndqueue, skb);
 623         tasklet_schedule(&instance->tx_channel.tasklet);
 624
 625         return 0;
 626
 627  fail:
 628         usbatm_pop(vcc, skb);
 629         return err;
 630 }
 631
 632
 633 /********************
 634 **  bean counting  **
 635 ********************/
 636
 637 static void usbatm_destroy_instance(struct kref *kref)
 638 {
 639         struct usbatm_data *instance = container_of(kref, struct usbatm_data, refcount);
 640
 641         dbg("%s", __func__);
 642
 643         tasklet_kill(&instance->rx_channel.tasklet);
 644         tasklet_kill(&instance->tx_channel.tasklet);
 645         usb_put_dev(instance->usb_dev);
 646         kfree(instance);
 647 }
 648
 649 void usbatm_get_instance(struct usbatm_data *instance)
 650 {
 651         dbg("%s", __func__);
 652
 653         kref_get(&instance->refcount);
 654 }
 655
 656 void usbatm_put_instance(struct usbatm_data *instance)
 657 {
 658         dbg("%s", __func__);
 659
 660         kref_put(&instance->refcount, usbatm_destroy_instance);
 661 }
 662
 663
 664 /**********
 665 **  ATM  **
 666 **********/
 667
 668 static void usbatm_atm_dev_close(struct atm_dev *dev)
 669 {
 670         struct usbatm_data *instance = dev->dev_data;
 671
 672         dbg("%s", __func__);
 673
 674         if (!instance)
 675                 return;
 676
 677         dev->dev_data = NULL;
 678         usbatm_put_instance(instance);  /* taken in usbatm_atm_init */
 679 }
 680
 681 static int usbatm_atm_proc_read(struct atm_dev *atm_dev, loff_t * pos, char *page)
 682 {
 683         struct usbatm_data *instance = atm_dev->dev_data;
 684         int left = *pos;
 685
 686         if (!instance) {
 687                 dbg("%s: NULL instance!", __func__);
 688                 return -ENODEV;
 689         }
 690
 691         if (!left--)
 692                 return sprintf(page, "%s\n", instance->description);
 693
 694         if (!left--)
 695                 return sprintf(page, "MAC: %02x:%02x:%02x:%02x:%02x:%02x\n",
 696                                atm_dev->esi[0], atm_dev->esi[1],
 697                                atm_dev->esi[2], atm_dev->esi[3],
 698                                atm_dev->esi[4], atm_dev->esi[5]);
 699
 700         if (!left--)
 701                 return sprintf(page,
 702                                "AAL5: tx %d ( %d err ), rx %d ( %d err, %d drop )\n",
 703                                atomic_read(&atm_dev->stats.aal5.tx),
 704                                atomic_read(&atm_dev->stats.aal5.tx_err),
 705                                atomic_read(&atm_dev->stats.aal5.rx),
 706                                atomic_read(&atm_dev->stats.aal5.rx_err),
 707                                atomic_read(&atm_dev->stats.aal5.rx_drop));
 708
 709         if (!left--)
 710                 switch (atm_dev->signal) {
 711                 case ATM_PHY_SIG_FOUND:
 712                         return sprintf(page, "Line up\n");
 713                 case ATM_PHY_SIG_LOST:
 714                         return sprintf(page, "Line down\n");
 715                 default:
 716                         return sprintf(page, "Line state unknown\n");
 717                 }
 718
 719         return 0;
 720 }
 721
 722 static int usbatm_atm_open(struct atm_vcc *vcc)
 723 {
 724         struct usbatm_data *instance = vcc->dev->dev_data;
 725         struct usbatm_vcc_data *new = NULL;
 726         int ret;
 727         int vci = vcc->vci;
 728         short vpi = vcc->vpi;
 729
 730         if (!instance) {
 731                 dbg("%s: NULL data!", __func__);
 732                 return -ENODEV;
 733         }
 734
 735         atm_dbg(instance, "%s: vpi %hd, vci %d\n", __func__, vpi, vci);
 736
 737         /* only support AAL5 */
 738         if ((vcc->qos.aal != ATM_AAL5) || (vcc->qos.rxtp.max_sdu < 0)
 739             || (vcc->qos.rxtp.max_sdu > ATM_MAX_AAL5_PDU)) {
 740                 atm_dbg(instance, "%s: unsupported ATM type %d!\n", __func__, vcc->qos.aal);
 741                 return -EINVAL;
 742         }
 743
 744         down(&instance->serialize);     /* vs self, usbatm_atm_close */
 745
 746         if (usbatm_find_vcc(instance, vpi, vci)) {
 747                 atm_dbg(instance, "%s: %hd/%d already in use!\n", __func__, vpi, vci);
 748                 ret = -EADDRINUSE;
 749                 goto fail;
 750         }
 751
 752         if (!(new = kmalloc(sizeof(struct usbatm_vcc_data), GFP_KERNEL))) {
 753                 atm_dbg(instance, "%s: no memory for vcc_data!\n", __func__);
 754                 ret = -ENOMEM;
 755                 goto fail;
 756         }
 757
 758         memset(new, 0, sizeof(struct usbatm_vcc_data));
 759         new->vcc = vcc;
 760         new->vpi = vpi;
 761         new->vci = vci;
 762
 763         new->sarb = alloc_skb(usbatm_pdu_length(vcc->qos.rxtp.max_sdu), GFP_KERNEL);
 764         if (!new->sarb) {
 765                 atm_dbg(instance, "%s: no memory for SAR buffer!\n", __func__);
 766                 ret = -ENOMEM;
 767                 goto fail;
 768         }
 769
 770         vcc->dev_data = new;
 771
 772         tasklet_disable(&instance->rx_channel.tasklet);
 773         list_add(&new->list, &instance->vcc_list);
 774         tasklet_enable(&instance->rx_channel.tasklet);
 775
 776         set_bit(ATM_VF_ADDR, &vcc->flags);
 777         set_bit(ATM_VF_PARTIAL, &vcc->flags);
 778         set_bit(ATM_VF_READY, &vcc->flags);
 779
 780         up(&instance->serialize);
 781
 782         atm_dbg(instance, "%s: allocated vcc data 0x%p\n", __func__, new);
 783
 784         return 0;
 785
 786 fail:
 787         kfree(new);
 788         up(&instance->serialize);
 789         return ret;
 790 }
 791
 792 static void usbatm_atm_close(struct atm_vcc *vcc)
 793 {
 794         struct usbatm_data *instance = vcc->dev->dev_data;
 795         struct usbatm_vcc_data *vcc_data = vcc->dev_data;
 796
 797         if (!instance || !vcc_data) {
 798                 dbg("%s: NULL data!", __func__);
 799                 return;
 800         }
 801
 802         atm_dbg(instance, "%s entered\n", __func__);
 803
 804         atm_dbg(instance, "%s: deallocating vcc 0x%p with vpi %d vci %d\n",
 805                 __func__, vcc_data, vcc_data->vpi, vcc_data->vci);
 806
 807         usbatm_cancel_send(instance, vcc);
 808
 809         down(&instance->serialize);     /* vs self, usbatm_atm_open */
 810
 811         tasklet_disable(&instance->rx_channel.tasklet);
 812         list_del(&vcc_data->list);
 813         tasklet_enable(&instance->rx_channel.tasklet);
 814
 815         kfree_skb(vcc_data->sarb);
 816         vcc_data->sarb = NULL;
 817
 818         kfree(vcc_data);
 819         vcc->dev_data = NULL;
 820
 821         vcc->vpi = ATM_VPI_UNSPEC;
 822         vcc->vci = ATM_VCI_UNSPEC;
 823         clear_bit(ATM_VF_READY, &vcc->flags);
 824         clear_bit(ATM_VF_PARTIAL, &vcc->flags);
 825         clear_bit(ATM_VF_ADDR, &vcc->flags);
 826
 827         up(&instance->serialize);
 828
 829         atm_dbg(instance, "%s successful\n", __func__);
 830 }
 831
 832 static int usbatm_atm_ioctl(struct atm_dev *dev, unsigned int cmd,
 833                           void __user * arg)
 834 {
 835         switch (cmd) {
 836         case ATM_QUERYLOOP:
 837                 return put_user(ATM_LM_NONE, (int __user *)arg) ? -EFAULT : 0;
 838         default:
 839                 return -ENOIOCTLCMD;
 840         }
 841 }
 842
 843 static int usbatm_atm_init(struct usbatm_data *instance)
 844 {
 845         struct atm_dev *atm_dev;
 846         int ret, i;
 847
 848         /* ATM init */
 849         atm_dev = atm_dev_register(instance->driver_name, &usbatm_atm_devops, -1, NULL);
 850         if (!atm_dev) {
 851                 usb_dbg(instance, "%s: failed to register ATM device!\n", __func__);
 852                 return -1;
 853         }
 854
 855         instance->atm_dev = atm_dev;
 856
 857         atm_dev->ci_range.vpi_bits = ATM_CI_MAX;
 858         atm_dev->ci_range.vci_bits = ATM_CI_MAX;
 859         atm_dev->signal = ATM_PHY_SIG_UNKNOWN;
 860
 861         /* temp init ATM device, set to 128kbit */
 862         atm_dev->link_rate = 128 * 1000 / 424;
 863
 864         if (instance->driver->atm_start && ((ret = instance->driver->atm_start(instance, atm_dev)) < 0)) {
 865                 atm_dbg(instance, "%s: atm_start failed: %d!\n", __func__, ret);
 866                 goto fail;
 867         }
 868
 869         /* ready for ATM callbacks */
 870         usbatm_get_instance(instance);  /* dropped in usbatm_atm_dev_close */
 871         mb();
 872         atm_dev->dev_data = instance;
 873
 874         /* submit all rx URBs */
 875         for (i = 0; i < num_rcv_urbs; i++)
 876                 usbatm_submit_urb(instance->urbs[i]);
 877
 878         return 0;
 879
 880  fail:
 881         instance->atm_dev = NULL;
 882         shutdown_atm_dev(atm_dev); /* usbatm_atm_dev_close will eventually be called */
 883         return ret;
 884 }
 885
 886
 887 /**********
 888 **  USB  **
 889 **********/
 890
 891 static int usbatm_do_heavy_init(void *arg)
 892 {
 893         struct usbatm_data *instance = arg;
 894         int ret;
 895
 896         daemonize(instance->driver->driver_name);
 897         allow_signal(SIGTERM);
 898
 899         complete(&instance->thread_started);
 900
 901         ret = instance->driver->heavy_init(instance, instance->usb_intf);
 902
 903         if (!ret)
 904                 ret = usbatm_atm_init(instance);
 905
 906         down(&instance->serialize);
 907         instance->thread_pid = -1;
 908         up(&instance->serialize);
 909
 910         complete_and_exit(&instance->thread_exited, ret);
 911 }
 912
 913 static int usbatm_heavy_init(struct usbatm_data *instance)
 914 {
 915         int ret = kernel_thread(usbatm_do_heavy_init, instance, CLONE_KERNEL);
 916
 917         if (ret < 0) {
 918                 usb_dbg(instance, "%s: failed to create kernel_thread (%d)!\n", __func__, ret);
 919                 return ret;
 920         }
 921
 922         down(&instance->serialize);
 923         instance->thread_pid = ret;
 924         up(&instance->serialize);
 925
 926         wait_for_completion(&instance->thread_started);
 927
 928         return 0;
 929 }
 930
 931 static void usbatm_tasklet_schedule(unsigned long data)
 932 {
 933         tasklet_schedule((struct tasklet_struct *) data);
 934 }
 935
 936 static inline void usbatm_init_channel(struct usbatm_channel *channel)
 937 {
 938         spin_lock_init(&channel->lock);
 939         INIT_LIST_HEAD(&channel->list);
 940         channel->delay.function = usbatm_tasklet_schedule;
 941         channel->delay.data = (unsigned long) &channel->tasklet;
 942         init_timer(&channel->delay);
 943 }
 944
 945 int usbatm_usb_probe(struct usb_interface *intf, const struct usb_device_id *id,
 946                      struct usbatm_driver *driver)
 947 {
 948         struct device *dev = &intf->dev;
 949         struct usb_device *usb_dev = interface_to_usbdev(intf);
 950         struct usbatm_data *instance;
 951         char *buf;
 952         int error = -ENOMEM;
 953         int i, length;
 954         int need_heavy;
 955
 956         dev_dbg(dev, "%s: trying driver %s with vendor=0x%x, product=0x%x, ifnum %d\n",
 957                         __func__, driver->driver_name,
 958                         le16_to_cpu(usb_dev->descriptor.idVendor),
 959                         le16_to_cpu(usb_dev->descriptor.idProduct),
 960                         intf->altsetting->desc.bInterfaceNumber);
 961
 962         /* instance init */
 963         instance = kcalloc(1, sizeof(*instance) + sizeof(struct urb *) * (num_rcv_urbs + num_snd_urbs), GFP_KERNEL);
 964         if (!instance) {
 965                 dev_dbg(dev, "%s: no memory for instance data!\n", __func__);
 966                 return -ENOMEM;
 967         }
 968
 969         /* public fields */
 970
 971         instance->driver = driver;
 972         snprintf(instance->driver_name, sizeof(instance->driver_name), driver->driver_name);
 973
 974         instance->usb_dev = usb_dev;
 975         instance->usb_intf = intf;
 976
 977         buf = instance->description;
 978         length = sizeof(instance->description);
 979
 980         if ((i = usb_string(usb_dev, usb_dev->descriptor.iProduct, buf, length)) < 0)
 981                 goto bind;
 982
 983         buf += i;
 984         length -= i;
 985
 986         i = scnprintf(buf, length, " (");
 987         buf += i;
 988         length -= i;
 989
 990         if (length <= 0 || (i = usb_make_path(usb_dev, buf, length)) < 0)
 991                 goto bind;
 992
 993         buf += i;
 994         length -= i;
 995
 996         snprintf(buf, length, ")");
 997
 998  bind:
 999         need_heavy = 1;
1000         if (driver->bind && (error = driver->bind(instance, intf, id, &need_heavy)) < 0) {
1001                         dev_dbg(dev, "%s: bind failed: %d!\n", __func__, error);
1002                         goto fail_free;
1003         }
1004
1005         /* private fields */
1006
1007         kref_init(&instance->refcount);         /* dropped in usbatm_usb_disconnect */
1008         init_MUTEX(&instance->serialize);
1009
1010         instance->thread_pid = -1;
1011         init_completion(&instance->thread_started);
1012         init_completion(&instance->thread_exited);
1013
1014         INIT_LIST_HEAD(&instance->vcc_list);
1015
1016         usbatm_init_channel(&instance->rx_channel);
1017         usbatm_init_channel(&instance->tx_channel);
1018         tasklet_init(&instance->rx_channel.tasklet, usbatm_rx_process, (unsigned long)instance);
1019         tasklet_init(&instance->tx_channel.tasklet, usbatm_tx_process, (unsigned long)instance);
1020         instance->rx_channel.endpoint = usb_rcvbulkpipe(usb_dev, driver->in);
1021         instance->tx_channel.endpoint = usb_sndbulkpipe(usb_dev, driver->out);
1022         instance->rx_channel.stride = ATM_CELL_SIZE + driver->rx_padding;
1023         instance->tx_channel.stride = ATM_CELL_SIZE + driver->tx_padding;
1024         instance->rx_channel.buf_size = rcv_buf_size * instance->rx_channel.stride;
1025         instance->tx_channel.buf_size = snd_buf_size * instance->tx_channel.stride;
1026         instance->rx_channel.usbatm = instance->tx_channel.usbatm = instance;
1027
1028         skb_queue_head_init(&instance->sndqueue);
1029
1030         for (i = 0; i < num_rcv_urbs + num_snd_urbs; i++) {
1031                 struct urb *urb;
1032                 u8 *buffer;
1033                 unsigned int iso_packets = 0, iso_size = 0;
1034                 struct usbatm_channel *channel = i < num_rcv_urbs ?
1035                         &instance->rx_channel : &instance->tx_channel;
1036
1037                 if (usb_pipeisoc(channel->endpoint)) {
1038                         /* don't expect iso out endpoints */
1039                         iso_size = usb_maxpacket(instance->usb_dev, channel->endpoint, 0);
1040                         iso_size -= iso_size % channel->stride; /* alignment */
1041                         BUG_ON(!iso_size);
1042                         iso_packets = (channel->buf_size - 1) / iso_size + 1;
1043                 }
1044
1045                 urb = usb_alloc_urb(iso_packets, GFP_KERNEL);
1046                 if (!urb) {
1047                         dev_dbg(dev, "%s: no memory for urb %d!\n", __func__, i);
1048                         goto fail_unbind;
1049                 }
1050
1051                 instance->urbs[i] = urb;
1052
1053                 buffer = kmalloc(channel->buf_size, GFP_KERNEL);
1054                 if (!buffer) {
1055                         dev_dbg(dev, "%s: no memory for buffer %d!\n", __func__, i);
1056                         goto fail_unbind;
1057                 }
1058                 memset(buffer, 0, channel->buf_size);
1059
1060                 usb_fill_bulk_urb(urb, instance->usb_dev, channel->endpoint,
1061                                   buffer, channel->buf_size, usbatm_complete, channel);
1062                 if (iso_packets) {
1063                         int j;
1064                         urb->interval = 1;
1065                         urb->transfer_flags = URB_ISO_ASAP;
1066                         urb->number_of_packets = iso_packets;
1067                         for (j = 0; j < iso_packets; j++) {
1068                                 urb->iso_frame_desc[j].offset = iso_size * j;
1069                                 urb->iso_frame_desc[j].length = min_t(int, iso_size,
1070                                                                       channel->buf_size - urb->iso_frame_desc[j].offset);
1071                         }
1072                 }
1073
1074                 /* put all tx URBs on the list of spares */
1075                 if (i >= num_rcv_urbs)
1076                         list_add_tail(&urb->urb_list, &channel->list);
1077
1078                 vdbg("%s: alloced buffer 0x%p buf size %u urb 0x%p",
1079                      __func__, urb->transfer_buffer, urb->transfer_buffer_length, urb);
1080         }
1081
1082         if (need_heavy && driver->heavy_init) {
1083                 error = usbatm_heavy_init(instance);
1084         } else {
1085                 complete(&instance->thread_exited);     /* pretend that heavy_init was run */
1086                 error = usbatm_atm_init(instance);
1087         }
1088
1089         if (error < 0)
1090                 goto fail_unbind;
1091
1092         usb_get_dev(usb_dev);
1093         usb_set_intfdata(intf, instance);
1094
1095         return 0;
1096
1097  fail_unbind:
1098         if (instance->driver->unbind)
1099                 instance->driver->unbind(instance, intf);
1100  fail_free:
1101         for (i = 0; i < num_rcv_urbs + num_snd_urbs; i++) {
1102                 if (instance->urbs[i])
1103                         kfree(instance->urbs[i]->transfer_buffer);
1104                 usb_free_urb(instance->urbs[i]);
1105         }
1106
1107         kfree (instance);
1108
1109         return error;
1110 }
1111 EXPORT_SYMBOL_GPL(usbatm_usb_probe);
1112
1113 void usbatm_usb_disconnect(struct usb_interface *intf)
1114 {
1115         struct device *dev = &intf->dev;
1116         struct usbatm_data *instance = usb_get_intfdata(intf);
1117         int i;
1118
1119         dev_dbg(dev, "%s entered\n", __func__);
1120
1121         if (!instance) {
1122                 dev_dbg(dev, "%s: NULL instance!\n", __func__);
1123                 return;
1124         }
1125
1126         usb_set_intfdata(intf, NULL);
1127
1128         down(&instance->serialize);
1129         if (instance->thread_pid >= 0)
1130                 kill_proc(instance->thread_pid, SIGTERM, 1);
1131         up(&instance->serialize);
1132
1133         wait_for_completion(&instance->thread_exited);
1134
1135         tasklet_disable(&instance->rx_channel.tasklet);
1136         tasklet_disable(&instance->tx_channel.tasklet);
1137
1138         for (i = 0; i < num_rcv_urbs + num_snd_urbs; i++)
1139                 usb_kill_urb(instance->urbs[i]);
1140
1141         del_timer_sync(&instance->rx_channel.delay);
1142         del_timer_sync(&instance->tx_channel.delay);
1143
1144         if (instance->atm_dev && instance->driver->atm_stop)
1145                 instance->driver->atm_stop(instance, instance->atm_dev);
1146
1147         if (instance->driver->unbind)
1148                 instance->driver->unbind(instance, intf);
1149
1150         instance->driver_data = NULL;
1151
1152         /* turn usbatm_[rt]x_process into noop */
1153         /* no need to take the spinlock */
1154         INIT_LIST_HEAD(&instance->rx_channel.list);
1155         INIT_LIST_HEAD(&instance->tx_channel.list);
1156
1157         tasklet_enable(&instance->rx_channel.tasklet);
1158         tasklet_enable(&instance->tx_channel.tasklet);
1159
1160         for (i = 0; i < num_rcv_urbs + num_snd_urbs; i++) {
1161                 kfree(instance->urbs[i]->transfer_buffer);
1162                 usb_free_urb(instance->urbs[i]);
1163         }
1164
1165         /* ATM finalize */
1166         if (instance->atm_dev)
1167                 shutdown_atm_dev(instance->atm_dev);
1168
1169         usbatm_put_instance(instance);  /* taken in usbatm_usb_probe */
1170 }
1171 EXPORT_SYMBOL_GPL(usbatm_usb_disconnect);
1172
1173
1174 /***********
1175 **  init  **
1176 ***********/
1177
1178 static int __init usbatm_usb_init(void)
1179 {
1180         dbg("%s: driver version %s", __func__, DRIVER_VERSION);
1181
1182         if (sizeof(struct usbatm_control) > sizeof(((struct sk_buff *) 0)->cb)) {
1183                 printk(KERN_ERR "%s unusable with this kernel!\n", usbatm_driver_name);
1184                 return -EIO;
1185         }
1186
1187         if ((num_rcv_urbs > UDSL_MAX_RCV_URBS)
1188             || (num_snd_urbs > UDSL_MAX_SND_URBS)
1189             || (rcv_buf_size < 1)
1190             || (rcv_buf_size > UDSL_MAX_RCV_BUF_SIZE)
1191             || (snd_buf_size < 1)
1192             || (snd_buf_size > UDSL_MAX_SND_BUF_SIZE))
1193                 return -EINVAL;
1194
1195         return 0;
1196 }
1197 module_init(usbatm_usb_init);
1198
1199 static void __exit usbatm_usb_exit(void)
1200 {
1201         dbg("%s", __func__);
1202 }
1203 module_exit(usbatm_usb_exit);
1204
1205 MODULE_AUTHOR(DRIVER_AUTHOR);
1206 MODULE_DESCRIPTION(DRIVER_DESC);
1207 MODULE_LICENSE("GPL");
1208 MODULE_VERSION(DRIVER_VERSION);
1209
1210 /************
1211 **  debug  **
1212 ************/
1213
1214 #ifdef VERBOSE_DEBUG
1215 static int usbatm_print_packet(const unsigned char *data, int len)
1216 {
1217         unsigned char buffer[256];
1218         int i = 0, j = 0;
1219
1220         for (i = 0; i < len;) {
1221                 buffer[0] = '\0';
1222                 sprintf(buffer, "%.3d :", i);
1223                 for (j = 0; (j < 16) && (i < len); j++, i++) {
1224                         sprintf(buffer, "%s %2.2x", buffer, data[i]);
1225                 }
1226                 dbg("%s", buffer);
1227         }
1228         return i;
1229 }
1230 #endif