drivers/usb/atm/usb_atm.c

   1 /******************************************************************************
   2  *  usb_atm.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
   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, maintained by Duncan Sands (duncan.sands@free.fr)
  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  *              udsl_usb_send_data_context->urb to a pointer and adding code
  45  *              to alloc and free it
  46  *              - remove_wait_queue() added to udsl_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 udsl_usb_send_data()
  61  *  1.1:        - Turned off packet debugging
  62  *
  63  */
  64
  65 #include <linux/module.h>
  66 #include <linux/moduleparam.h>
  67 #include <linux/kernel.h>
  68 #include <linux/sched.h>
  69 #include <linux/timer.h>
  70 #include <linux/errno.h>
  71 #include <linux/proc_fs.h>
  72 #include <linux/slab.h>
  73 #include <linux/wait.h>
  74 #include <linux/list.h>
  75 #include <asm/uaccess.h>
  76 #include <linux/smp_lock.h>
  77 #include <linux/interrupt.h>
  78 #include <linux/atm.h>
  79 #include <linux/atmdev.h>
  80 #include <linux/crc32.h>
  81 #include <linux/init.h>
  82 #include <linux/firmware.h>
  83
  84 #include "usb_atm.h"
  85
  86 #ifdef VERBOSE_DEBUG
  87 static int udsl_print_packet(const unsigned char *data, int len);
  88 #define PACKETDEBUG(arg...)     udsl_print_packet (arg)
  89 #define vdbg(arg...)            dbg (arg)
  90 #else
  91 #define PACKETDEBUG(arg...)
  92 #define vdbg(arg...)
  93 #endif
  94
  95 #define DRIVER_AUTHOR   "Johan Verrept, Duncan Sands <duncan.sands@free.fr>"
  96 #define DRIVER_VERSION  "1.8"
  97 #define DRIVER_DESC     "Generic USB ATM/DSL I/O, version " DRIVER_VERSION
  98
  99 static unsigned int num_rcv_urbs = UDSL_DEFAULT_RCV_URBS;
 100 static unsigned int num_snd_urbs = UDSL_DEFAULT_SND_URBS;
 101 static unsigned int num_rcv_bufs = UDSL_DEFAULT_RCV_BUFS;
 102 static unsigned int num_snd_bufs = UDSL_DEFAULT_SND_BUFS;
 103 static unsigned int rcv_buf_size = UDSL_DEFAULT_RCV_BUF_SIZE;
 104 static unsigned int snd_buf_size = UDSL_DEFAULT_SND_BUF_SIZE;
 105
 106 module_param(num_rcv_urbs, uint, 0444);
 107 MODULE_PARM_DESC(num_rcv_urbs,
 108                  "Number of urbs used for reception (range: 0-"
 109                  __MODULE_STRING(UDSL_MAX_RCV_URBS) ", default: "
 110                  __MODULE_STRING(UDSL_DEFAULT_RCV_URBS) ")");
 111
 112 module_param(num_snd_urbs, uint, 0444);
 113 MODULE_PARM_DESC(num_snd_urbs,
 114                  "Number of urbs used for transmission (range: 0-"
 115                  __MODULE_STRING(UDSL_MAX_SND_URBS) ", default: "
 116                  __MODULE_STRING(UDSL_DEFAULT_SND_URBS) ")");
 117
 118 module_param(num_rcv_bufs, uint, 0444);
 119 MODULE_PARM_DESC(num_rcv_bufs,
 120                  "Number of buffers used for reception (range: 0-"
 121                  __MODULE_STRING(UDSL_MAX_RCV_BUFS) ", default: "
 122                  __MODULE_STRING(UDSL_DEFAULT_RCV_BUFS) ")");
 123
 124 module_param(num_snd_bufs, uint, 0444);
 125 MODULE_PARM_DESC(num_snd_bufs,
 126                  "Number of buffers used for transmission (range: 0-"
 127                  __MODULE_STRING(UDSL_MAX_SND_BUFS) ", default: "
 128                  __MODULE_STRING(UDSL_DEFAULT_SND_BUFS) ")");
 129
 130 module_param(rcv_buf_size, uint, 0444);
 131 MODULE_PARM_DESC(rcv_buf_size,
 132                  "Size of the buffers used for reception (range: 0-"
 133                  __MODULE_STRING(UDSL_MAX_RCV_BUF_SIZE) ", default: "
 134                  __MODULE_STRING(UDSL_DEFAULT_RCV_BUF_SIZE) ")");
 135
 136 module_param(snd_buf_size, uint, 0444);
 137 MODULE_PARM_DESC(snd_buf_size,
 138                  "Size of the buffers used for transmission (range: 0-"
 139                  __MODULE_STRING(UDSL_MAX_SND_BUF_SIZE) ", default: "
 140                  __MODULE_STRING(UDSL_DEFAULT_SND_BUF_SIZE) ")");
 141
 142 /* ATM */
 143
 144 static void udsl_atm_dev_close(struct atm_dev *dev);
 145 static int udsl_atm_open(struct atm_vcc *vcc);
 146 static void udsl_atm_close(struct atm_vcc *vcc);
 147 static int udsl_atm_ioctl(struct atm_dev *dev, unsigned int cmd, void __user * arg);
 148 static int udsl_atm_send(struct atm_vcc *vcc, struct sk_buff *skb);
 149 static int udsl_atm_proc_read(struct atm_dev *atm_dev, loff_t * pos, char *page);
 150
 151 static struct atmdev_ops udsl_atm_devops = {
 152         .dev_close      = udsl_atm_dev_close,
 153         .open           = udsl_atm_open,
 154         .close          = udsl_atm_close,
 155         .ioctl          = udsl_atm_ioctl,
 156         .send           = udsl_atm_send,
 157         .proc_read      = udsl_atm_proc_read,
 158         .owner          = THIS_MODULE,
 159 };
 160
 161 /***********
 162 **  misc  **
 163 ***********/
 164
 165 static inline void udsl_pop(struct atm_vcc *vcc, struct sk_buff *skb)
 166 {
 167         if (vcc->pop)
 168                 vcc->pop(vcc, skb);
 169         else
 170                 dev_kfree_skb(skb);
 171 }
 172
 173 /*************
 174 **  decode  **
 175 *************/
 176
 177 static inline struct udsl_vcc_data *udsl_find_vcc(struct udsl_instance_data *instance,
 178                                                   short vpi, int vci)
 179 {
 180         struct udsl_vcc_data *vcc;
 181
 182         list_for_each_entry(vcc, &instance->vcc_list, list)
 183                 if ((vcc->vci == vci) && (vcc->vpi == vpi))
 184                         return vcc;
 185         return NULL;
 186 }
 187
 188 static void udsl_extract_cells(struct udsl_instance_data *instance,
 189                                unsigned char *source, unsigned int howmany)
 190 {
 191         struct udsl_vcc_data *cached_vcc = NULL;
 192         struct atm_vcc *vcc;
 193         struct sk_buff *sarb;
 194         struct udsl_vcc_data *vcc_data;
 195         int cached_vci = 0;
 196         unsigned int i;
 197         int pti;
 198         int vci;
 199         short cached_vpi = 0;
 200         short vpi;
 201
 202         for (i = 0; i < howmany;
 203              i++, source += ATM_CELL_SIZE + instance->rcv_padding) {
 204                 vpi = ((source[0] & 0x0f) << 4) | (source[1] >> 4);
 205                 vci = ((source[1] & 0x0f) << 12) | (source[2] << 4) | (source[3] >> 4);
 206                 pti = (source[3] & 0x2) != 0;
 207
 208                 vdbg("udsl_extract_cells: vpi %hd, vci %d, pti %d", vpi, vci, pti);
 209
 210                 if (cached_vcc && (vci == cached_vci) && (vpi == cached_vpi))
 211                         vcc_data = cached_vcc;
 212                 else if ((vcc_data = udsl_find_vcc(instance, vpi, vci))) {
 213                         cached_vcc = vcc_data;
 214                         cached_vpi = vpi;
 215                         cached_vci = vci;
 216                 } else {
 217                         dbg("udsl_extract_cells: unknown vpi/vci (%hd/%d)!", vpi, vci);
 218                         continue;
 219                 }
 220
 221                 vcc = vcc_data->vcc;
 222                 sarb = vcc_data->sarb;
 223
 224                 if (sarb->tail + ATM_CELL_PAYLOAD > sarb->end) {
 225                         dbg("udsl_extract_cells: buffer overrun (sarb->len %u, vcc: 0x%p)!", sarb->len, vcc);
 226                         /* discard cells already received */
 227                         skb_trim(sarb, 0);
 228                 }
 229
 230                 memcpy(sarb->tail, source + ATM_CELL_HEADER, ATM_CELL_PAYLOAD);
 231                 __skb_put(sarb, ATM_CELL_PAYLOAD);
 232
 233                 if (pti) {
 234                         struct sk_buff *skb;
 235                         unsigned int length;
 236                         unsigned int pdu_length;
 237
 238                         length = (source[ATM_CELL_SIZE - 6] << 8) + source[ATM_CELL_SIZE - 5];
 239
 240                         /* guard against overflow */
 241                         if (length > ATM_MAX_AAL5_PDU) {
 242                                 dbg("udsl_extract_cells: bogus length %u (vcc: 0x%p)!", length, vcc);
 243                                 atomic_inc(&vcc->stats->rx_err);
 244                                 goto out;
 245                         }
 246
 247                         pdu_length = UDSL_NUM_CELLS(length) * ATM_CELL_PAYLOAD;
 248
 249                         if (sarb->len < pdu_length) {
 250                                 dbg("udsl_extract_cells: bogus pdu_length %u (sarb->len: %u, vcc: 0x%p)!", pdu_length, sarb->len, vcc);
 251                                 atomic_inc(&vcc->stats->rx_err);
 252                                 goto out;
 253                         }
 254
 255                         if (crc32_be(~0, sarb->tail - pdu_length, pdu_length) != 0xc704dd7b) {
 256                                 dbg("udsl_extract_cells: packet failed crc check (vcc: 0x%p)!", vcc);
 257                                 atomic_inc(&vcc->stats->rx_err);
 258                                 goto out;
 259                         }
 260
 261                         vdbg("udsl_extract_cells: got packet (length: %u, pdu_length: %u, vcc: 0x%p)", length, pdu_length, vcc);
 262
 263                         if (!(skb = dev_alloc_skb(length))) {
 264                                 dbg("udsl_extract_cells: no memory for skb (length: %u)!", length);
 265                                 atomic_inc(&vcc->stats->rx_drop);
 266                                 goto out;
 267                         }
 268
 269                         vdbg("udsl_extract_cells: allocated new sk_buff (skb: 0x%p, skb->truesize: %u)", skb, skb->truesize);
 270
 271                         if (!atm_charge(vcc, skb->truesize)) {
 272                                 dbg("udsl_extract_cells: failed atm_charge (skb->truesize: %u)!", skb->truesize);
 273                                 dev_kfree_skb(skb);
 274                                 goto out;       /* atm_charge increments rx_drop */
 275                         }
 276
 277                         memcpy(skb->data, sarb->tail - pdu_length, length);
 278                         __skb_put(skb, length);
 279
 280                         vdbg("udsl_extract_cells: sending skb 0x%p, skb->len %u, skb->truesize %u", skb, skb->len, skb->truesize);
 281
 282                         PACKETDEBUG(skb->data, skb->len);
 283
 284                         vcc->push(vcc, skb);
 285
 286                         atomic_inc(&vcc->stats->rx);
 287                 out:
 288                         skb_trim(sarb, 0);
 289                 }
 290         }
 291 }
 292
 293 /*************
 294 **  encode  **
 295 *************/
 296
 297 static inline void udsl_fill_cell_header(unsigned char *target, struct atm_vcc *vcc)
 298 {
 299         target[0] = vcc->vpi >> 4;
 300         target[1] = (vcc->vpi << 4) | (vcc->vci >> 12);
 301         target[2] = vcc->vci >> 4;
 302         target[3] = vcc->vci << 4;
 303         target[4] = 0xec;
 304 }
 305
 306 static const unsigned char zeros[ATM_CELL_PAYLOAD];
 307
 308 static void udsl_groom_skb(struct atm_vcc *vcc, struct sk_buff *skb)
 309 {
 310         struct udsl_control *ctrl = UDSL_SKB(skb);
 311         unsigned int zero_padding;
 312         u32 crc;
 313
 314         ctrl->atm_data.vcc = vcc;
 315
 316         ctrl->num_cells = UDSL_NUM_CELLS(skb->len);
 317         ctrl->num_entire = skb->len / ATM_CELL_PAYLOAD;
 318
 319         zero_padding = ctrl->num_cells * ATM_CELL_PAYLOAD - skb->len - ATM_AAL5_TRAILER;
 320
 321         if (ctrl->num_entire + 1 < ctrl->num_cells)
 322                 ctrl->pdu_padding = zero_padding - (ATM_CELL_PAYLOAD - ATM_AAL5_TRAILER);
 323         else
 324                 ctrl->pdu_padding = zero_padding;
 325
 326         ctrl->aal5_trailer[0] = 0;      /* UU = 0 */
 327         ctrl->aal5_trailer[1] = 0;      /* CPI = 0 */
 328         ctrl->aal5_trailer[2] = skb->len >> 8;
 329         ctrl->aal5_trailer[3] = skb->len;
 330
 331         crc = crc32_be(~0, skb->data, skb->len);
 332         crc = crc32_be(crc, zeros, zero_padding);
 333         crc = crc32_be(crc, ctrl->aal5_trailer, 4);
 334         crc = ~crc;
 335
 336         ctrl->aal5_trailer[4] = crc >> 24;
 337         ctrl->aal5_trailer[5] = crc >> 16;
 338         ctrl->aal5_trailer[6] = crc >> 8;
 339         ctrl->aal5_trailer[7] = crc;
 340 }
 341
 342 static unsigned int udsl_write_cells(struct udsl_instance_data *instance,
 343                                      unsigned int howmany, struct sk_buff *skb,
 344                                      unsigned char **target_p)
 345 {
 346         struct udsl_control *ctrl = UDSL_SKB(skb);
 347         unsigned char *target = *target_p;
 348         unsigned int nc, ne, i;
 349
 350         vdbg("udsl_write_cells: howmany=%u, skb->len=%d, num_cells=%u, num_entire=%u, pdu_padding=%u", howmany, skb->len, ctrl->num_cells, ctrl->num_entire, ctrl->pdu_padding);
 351
 352         nc = ctrl->num_cells;
 353         ne = min(howmany, ctrl->num_entire);
 354
 355         for (i = 0; i < ne; i++) {
 356                 udsl_fill_cell_header(target, ctrl->atm_data.vcc);
 357                 target += ATM_CELL_HEADER;
 358                 memcpy(target, skb->data, ATM_CELL_PAYLOAD);
 359                 target += ATM_CELL_PAYLOAD;
 360                 if (instance->snd_padding) {
 361                         memset(target, 0, instance->snd_padding);
 362                         target += instance->snd_padding;
 363                 }
 364                 __skb_pull(skb, ATM_CELL_PAYLOAD);
 365         }
 366
 367         ctrl->num_entire -= ne;
 368
 369         if (!(ctrl->num_cells -= ne) || !(howmany -= ne))
 370                 goto out;
 371
 372         udsl_fill_cell_header(target, ctrl->atm_data.vcc);
 373         target += ATM_CELL_HEADER;
 374         memcpy(target, skb->data, skb->len);
 375         target += skb->len;
 376         __skb_pull(skb, skb->len);
 377         memset(target, 0, ctrl->pdu_padding);
 378         target += ctrl->pdu_padding;
 379
 380         if (--ctrl->num_cells) {
 381                 if (!--howmany) {
 382                         ctrl->pdu_padding = ATM_CELL_PAYLOAD - ATM_AAL5_TRAILER;
 383                         goto out;
 384                 }
 385
 386                 if (instance->snd_padding) {
 387                         memset(target, 0, instance->snd_padding);
 388                         target += instance->snd_padding;
 389                 }
 390                 udsl_fill_cell_header(target, ctrl->atm_data.vcc);
 391                 target += ATM_CELL_HEADER;
 392                 memset(target, 0, ATM_CELL_PAYLOAD - ATM_AAL5_TRAILER);
 393                 target += ATM_CELL_PAYLOAD - ATM_AAL5_TRAILER;
 394
 395                 --ctrl->num_cells;
 396                 UDSL_ASSERT(!ctrl->num_cells);
 397         }
 398
 399         memcpy(target, ctrl->aal5_trailer, ATM_AAL5_TRAILER);
 400         target += ATM_AAL5_TRAILER;
 401         /* set pti bit in last cell */
 402         *(target + 3 - ATM_CELL_SIZE) |= 0x2;
 403         if (instance->snd_padding) {
 404                 memset(target, 0, instance->snd_padding);
 405                 target += instance->snd_padding;
 406         }
 407  out:
 408         *target_p = target;
 409         return nc - ctrl->num_cells;
 410 }
 411
 412 /**************
 413 **  receive  **
 414 **************/
 415
 416 static void udsl_complete_receive(struct urb *urb, struct pt_regs *regs)
 417 {
 418         struct udsl_receive_buffer *buf;
 419         struct udsl_instance_data *instance;
 420         struct udsl_receiver *rcv;
 421         unsigned long flags;
 422
 423         if (!urb || !(rcv = urb->context)) {
 424                 dbg("udsl_complete_receive: bad urb!");
 425                 return;
 426         }
 427
 428         instance = rcv->instance;
 429         buf = rcv->buffer;
 430
 431         buf->filled_cells = urb->actual_length / (ATM_CELL_SIZE + instance->rcv_padding);
 432
 433         vdbg("udsl_complete_receive: urb 0x%p, status %d, actual_length %d, filled_cells %u, rcv 0x%p, buf 0x%p", urb, urb->status, urb->actual_length, buf->filled_cells, rcv, buf);
 434
 435         UDSL_ASSERT(buf->filled_cells <= rcv_buf_size);
 436
 437         /* may not be in_interrupt() */
 438         spin_lock_irqsave(&instance->receive_lock, flags);
 439         list_add(&rcv->list, &instance->spare_receivers);
 440         list_add_tail(&buf->list, &instance->filled_receive_buffers);
 441         if (likely(!urb->status))
 442                 tasklet_schedule(&instance->receive_tasklet);
 443         spin_unlock_irqrestore(&instance->receive_lock, flags);
 444 }
 445
 446 static void udsl_process_receive(unsigned long data)
 447 {
 448         struct udsl_receive_buffer *buf;
 449         struct udsl_instance_data *instance = (struct udsl_instance_data *)data;
 450         struct udsl_receiver *rcv;
 451         int err;
 452
 453  made_progress:
 454         while (!list_empty(&instance->spare_receive_buffers)) {
 455                 spin_lock_irq(&instance->receive_lock);
 456                 if (list_empty(&instance->spare_receivers)) {
 457                         spin_unlock_irq(&instance->receive_lock);
 458                         break;
 459                 }
 460                 rcv = list_entry(instance->spare_receivers.next,
 461                                  struct udsl_receiver, list);
 462                 list_del(&rcv->list);
 463                 spin_unlock_irq(&instance->receive_lock);
 464
 465                 buf = list_entry(instance->spare_receive_buffers.next,
 466                                  struct udsl_receive_buffer, list);
 467                 list_del(&buf->list);
 468
 469                 rcv->buffer = buf;
 470
 471                 usb_fill_bulk_urb(rcv->urb, instance->usb_dev,
 472                                   usb_rcvbulkpipe(instance->usb_dev, instance->data_endpoint),
 473                                   buf->base,
 474                                   rcv_buf_size * (ATM_CELL_SIZE + instance->rcv_padding),
 475                                   udsl_complete_receive, rcv);
 476
 477                 vdbg("udsl_process_receive: sending urb 0x%p, rcv 0x%p, buf 0x%p",
 478                      rcv->urb, rcv, buf);
 479
 480                 if ((err = usb_submit_urb(rcv->urb, GFP_ATOMIC)) < 0) {
 481                         dbg("udsl_process_receive: urb submission failed (%d)!", err);
 482                         list_add(&buf->list, &instance->spare_receive_buffers);
 483                         spin_lock_irq(&instance->receive_lock);
 484                         list_add(&rcv->list, &instance->spare_receivers);
 485                         spin_unlock_irq(&instance->receive_lock);
 486                         break;
 487                 }
 488         }
 489
 490         spin_lock_irq(&instance->receive_lock);
 491         if (list_empty(&instance->filled_receive_buffers)) {
 492                 spin_unlock_irq(&instance->receive_lock);
 493                 return;         /* done - no more buffers */
 494         }
 495         buf = list_entry(instance->filled_receive_buffers.next,
 496                          struct udsl_receive_buffer, list);
 497         list_del(&buf->list);
 498         spin_unlock_irq(&instance->receive_lock);
 499
 500         vdbg("udsl_process_receive: processing buf 0x%p", buf);
 501         udsl_extract_cells(instance, buf->base, buf->filled_cells);
 502         list_add(&buf->list, &instance->spare_receive_buffers);
 503         goto made_progress;
 504 }
 505
 506 /***********
 507 **  send  **
 508 ***********/
 509
 510 static void udsl_complete_send(struct urb *urb, struct pt_regs *regs)
 511 {
 512         struct udsl_instance_data *instance;
 513         struct udsl_sender *snd;
 514         unsigned long flags;
 515
 516         if (!urb || !(snd = urb->context) || !(instance = snd->instance)) {
 517                 dbg("udsl_complete_send: bad urb!");
 518                 return;
 519         }
 520
 521         vdbg("udsl_complete_send: urb 0x%p, status %d, snd 0x%p, buf 0x%p", urb,
 522              urb->status, snd, snd->buffer);
 523
 524         /* may not be in_interrupt() */
 525         spin_lock_irqsave(&instance->send_lock, flags);
 526         list_add(&snd->list, &instance->spare_senders);
 527         list_add(&snd->buffer->list, &instance->spare_send_buffers);
 528         tasklet_schedule(&instance->send_tasklet);
 529         spin_unlock_irqrestore(&instance->send_lock, flags);
 530 }
 531
 532 static void udsl_process_send(unsigned long data)
 533 {
 534         struct udsl_send_buffer *buf;
 535         struct udsl_instance_data *instance = (struct udsl_instance_data *)data;
 536         struct sk_buff *skb;
 537         struct udsl_sender *snd;
 538         int err;
 539         unsigned int num_written;
 540
 541  made_progress:
 542         spin_lock_irq(&instance->send_lock);
 543         while (!list_empty(&instance->spare_senders)) {
 544                 if (!list_empty(&instance->filled_send_buffers)) {
 545                         buf = list_entry(instance->filled_send_buffers.next,
 546                                          struct udsl_send_buffer, list);
 547                         list_del(&buf->list);
 548                 } else if ((buf = instance->current_buffer)) {
 549                         instance->current_buffer = NULL;
 550                 } else          /* all buffers empty */
 551                         break;
 552
 553                 snd = list_entry(instance->spare_senders.next,
 554                                  struct udsl_sender, list);
 555                 list_del(&snd->list);
 556                 spin_unlock_irq(&instance->send_lock);
 557
 558                 snd->buffer = buf;
 559                 usb_fill_bulk_urb(snd->urb, instance->usb_dev,
 560                                   usb_sndbulkpipe(instance->usb_dev, instance->data_endpoint),
 561                                   buf->base,
 562                                   (snd_buf_size - buf->free_cells) * (ATM_CELL_SIZE + instance->snd_padding),
 563                                   udsl_complete_send, snd);
 564
 565                 vdbg("udsl_process_send: submitting urb 0x%p (%d cells), snd 0x%p, buf 0x%p",
 566                      snd->urb, snd_buf_size - buf->free_cells, snd, buf);
 567
 568                 if ((err = usb_submit_urb(snd->urb, GFP_ATOMIC)) < 0) {
 569                         dbg("udsl_process_send: urb submission failed (%d)!", err);
 570                         spin_lock_irq(&instance->send_lock);
 571                         list_add(&snd->list, &instance->spare_senders);
 572                         spin_unlock_irq(&instance->send_lock);
 573                         list_add(&buf->list, &instance->filled_send_buffers);
 574                         return; /* bail out */
 575                 }
 576
 577                 spin_lock_irq(&instance->send_lock);
 578         }                       /* while */
 579         spin_unlock_irq(&instance->send_lock);
 580
 581         if (!instance->current_skb)
 582                 instance->current_skb = skb_dequeue(&instance->sndqueue);
 583         if (!instance->current_skb)
 584                 return;         /* done - no more skbs */
 585
 586         skb = instance->current_skb;
 587
 588         if (!(buf = instance->current_buffer)) {
 589                 spin_lock_irq(&instance->send_lock);
 590                 if (list_empty(&instance->spare_send_buffers)) {
 591                         instance->current_buffer = NULL;
 592                         spin_unlock_irq(&instance->send_lock);
 593                         return; /* done - no more buffers */
 594                 }
 595                 buf = list_entry(instance->spare_send_buffers.next,
 596                                struct udsl_send_buffer, list);
 597                 list_del(&buf->list);
 598                 spin_unlock_irq(&instance->send_lock);
 599
 600                 buf->free_start = buf->base;
 601                 buf->free_cells = snd_buf_size;
 602
 603                 instance->current_buffer = buf;
 604         }
 605
 606         num_written = udsl_write_cells(instance, buf->free_cells, skb, &buf->free_start);
 607
 608         vdbg("udsl_process_send: wrote %u cells from skb 0x%p to buffer 0x%p",
 609              num_written, skb, buf);
 610
 611         if (!(buf->free_cells -= num_written)) {
 612                 list_add_tail(&buf->list, &instance->filled_send_buffers);
 613                 instance->current_buffer = NULL;
 614         }
 615
 616         vdbg("udsl_process_send: buffer contains %d cells, %d left",
 617              snd_buf_size - buf->free_cells, buf->free_cells);
 618
 619         if (!UDSL_SKB(skb)->num_cells) {
 620                 struct atm_vcc *vcc = UDSL_SKB(skb)->atm_data.vcc;
 621
 622                 udsl_pop(vcc, skb);
 623                 instance->current_skb = NULL;
 624
 625                 atomic_inc(&vcc->stats->tx);
 626         }
 627
 628         goto made_progress;
 629 }
 630
 631 static void udsl_cancel_send(struct udsl_instance_data *instance,
 632                              struct atm_vcc *vcc)
 633 {
 634         struct sk_buff *skb, *n;
 635
 636         dbg("udsl_cancel_send entered");
 637         spin_lock_irq(&instance->sndqueue.lock);
 638         for (skb = instance->sndqueue.next, n = skb->next;
 639              skb != (struct sk_buff *)&instance->sndqueue;
 640              skb = n, n = skb->next)
 641                 if (UDSL_SKB(skb)->atm_data.vcc == vcc) {
 642                         dbg("udsl_cancel_send: popping skb 0x%p", skb);
 643                         __skb_unlink(skb, &instance->sndqueue);
 644                         udsl_pop(vcc, skb);
 645                 }
 646         spin_unlock_irq(&instance->sndqueue.lock);
 647
 648         tasklet_disable(&instance->send_tasklet);
 649         if ((skb = instance->current_skb) && (UDSL_SKB(skb)->atm_data.vcc == vcc)) {
 650                 dbg("udsl_cancel_send: popping current skb (0x%p)", skb);
 651                 instance->current_skb = NULL;
 652                 udsl_pop(vcc, skb);
 653         }
 654         tasklet_enable(&instance->send_tasklet);
 655         dbg("udsl_cancel_send done");
 656 }
 657
 658 static int udsl_atm_send(struct atm_vcc *vcc, struct sk_buff *skb)
 659 {
 660         struct udsl_instance_data *instance = vcc->dev->dev_data;
 661         int err;
 662
 663         vdbg("udsl_atm_send called (skb 0x%p, len %u)", skb, skb->len);
 664
 665         if (!instance) {
 666                 dbg("udsl_atm_send: NULL data!");
 667                 err = -ENODEV;
 668                 goto fail;
 669         }
 670
 671         if (vcc->qos.aal != ATM_AAL5) {
 672                 dbg("udsl_atm_send: unsupported ATM type %d!", vcc->qos.aal);
 673                 err = -EINVAL;
 674                 goto fail;
 675         }
 676
 677         if (skb->len > ATM_MAX_AAL5_PDU) {
 678                 dbg("udsl_atm_send: packet too long (%d vs %d)!", skb->len,
 679                     ATM_MAX_AAL5_PDU);
 680                 err = -EINVAL;
 681                 goto fail;
 682         }
 683
 684         PACKETDEBUG(skb->data, skb->len);
 685
 686         udsl_groom_skb(vcc, skb);
 687         skb_queue_tail(&instance->sndqueue, skb);
 688         tasklet_schedule(&instance->send_tasklet);
 689
 690         return 0;
 691
 692  fail:
 693         udsl_pop(vcc, skb);
 694         return err;
 695 }
 696
 697 /********************
 698 **  bean counting  **
 699 ********************/
 700
 701 static void udsl_destroy_instance(struct kref *kref)
 702 {
 703         struct udsl_instance_data *instance =
 704             container_of(kref, struct udsl_instance_data, refcount);
 705
 706         tasklet_kill(&instance->receive_tasklet);
 707         tasklet_kill(&instance->send_tasklet);
 708         usb_put_dev(instance->usb_dev);
 709         kfree(instance);
 710 }
 711
 712 void udsl_get_instance(struct udsl_instance_data *instance)
 713 {
 714         kref_get(&instance->refcount);
 715 }
 716
 717 void udsl_put_instance(struct udsl_instance_data *instance)
 718 {
 719         kref_put(&instance->refcount, udsl_destroy_instance);
 720 }
 721
 722 /**********
 723 **  ATM  **
 724 **********/
 725
 726 static void udsl_atm_dev_close(struct atm_dev *dev)
 727 {
 728         struct udsl_instance_data *instance = dev->dev_data;
 729
 730         dev->dev_data = NULL;
 731         udsl_put_instance(instance);
 732 }
 733
 734 static int udsl_atm_proc_read(struct atm_dev *atm_dev, loff_t * pos, char *page)
 735 {
 736         struct udsl_instance_data *instance = atm_dev->dev_data;
 737         int left = *pos;
 738
 739         if (!instance) {
 740                 dbg("udsl_atm_proc_read: NULL instance!");
 741                 return -ENODEV;
 742         }
 743
 744         if (!left--)
 745                 return sprintf(page, "%s\n", instance->description);
 746
 747         if (!left--)
 748                 return sprintf(page, "MAC: %02x:%02x:%02x:%02x:%02x:%02x\n",
 749                                atm_dev->esi[0], atm_dev->esi[1],
 750                                atm_dev->esi[2], atm_dev->esi[3],
 751                                atm_dev->esi[4], atm_dev->esi[5]);
 752
 753         if (!left--)
 754                 return sprintf(page,
 755                                "AAL5: tx %d ( %d err ), rx %d ( %d err, %d drop )\n",
 756                                atomic_read(&atm_dev->stats.aal5.tx),
 757                                atomic_read(&atm_dev->stats.aal5.tx_err),
 758                                atomic_read(&atm_dev->stats.aal5.rx),
 759                                atomic_read(&atm_dev->stats.aal5.rx_err),
 760                                atomic_read(&atm_dev->stats.aal5.rx_drop));
 761
 762         if (!left--) {
 763                 switch (atm_dev->signal) {
 764                 case ATM_PHY_SIG_FOUND:
 765                         sprintf(page, "Line up");
 766                         break;
 767                 case ATM_PHY_SIG_LOST:
 768                         sprintf(page, "Line down");
 769                         break;
 770                 default:
 771                         sprintf(page, "Line state unknown");
 772                         break;
 773                 }
 774
 775                 if (instance->usb_dev->state == USB_STATE_NOTATTACHED)
 776                         strcat(page, ", disconnected\n");
 777                 else {
 778                         if (instance->status == UDSL_LOADED_FIRMWARE)
 779                                 strcat(page, ", firmware loaded\n");
 780                         else if (instance->status == UDSL_LOADING_FIRMWARE)
 781                                 strcat(page, ", firmware loading\n");
 782                         else
 783                                 strcat(page, ", no firmware\n");
 784                 }
 785
 786                 return strlen(page);
 787         }
 788
 789         return 0;
 790 }
 791
 792 static int udsl_atm_open(struct atm_vcc *vcc)
 793 {
 794         struct udsl_instance_data *instance = vcc->dev->dev_data;
 795         struct udsl_vcc_data *new;
 796         unsigned int max_pdu;
 797         int vci = vcc->vci;
 798         short vpi = vcc->vpi;
 799         int err;
 800
 801         dbg("udsl_atm_open: vpi %hd, vci %d", vpi, vci);
 802
 803         if (!instance) {
 804                 dbg("udsl_atm_open: NULL data!");
 805                 return -ENODEV;
 806         }
 807
 808         /* only support AAL5 */
 809         if ((vcc->qos.aal != ATM_AAL5) || (vcc->qos.rxtp.max_sdu < 0)
 810             || (vcc->qos.rxtp.max_sdu > ATM_MAX_AAL5_PDU)) {
 811                 dbg("udsl_atm_open: unsupported ATM type %d!", vcc->qos.aal);
 812                 return -EINVAL;
 813         }
 814
 815         if (instance->firmware_wait &&
 816             (err = instance->firmware_wait(instance)) < 0) {
 817                 dbg("udsl_atm_open: firmware not loaded (%d)!", err);
 818                 return err;
 819         }
 820
 821         down(&instance->serialize);     /* vs self, udsl_atm_close */
 822
 823         if (udsl_find_vcc(instance, vpi, vci)) {
 824                 dbg("udsl_atm_open: %hd/%d already in use!", vpi, vci);
 825                 up(&instance->serialize);
 826                 return -EADDRINUSE;
 827         }
 828
 829         if (!(new = kmalloc(sizeof(struct udsl_vcc_data), GFP_KERNEL))) {
 830                 dbg("udsl_atm_open: no memory for vcc_data!");
 831                 up(&instance->serialize);
 832                 return -ENOMEM;
 833         }
 834
 835         memset(new, 0, sizeof(struct udsl_vcc_data));
 836         new->vcc = vcc;
 837         new->vpi = vpi;
 838         new->vci = vci;
 839
 840         /* udsl_extract_cells requires at least one cell */
 841         max_pdu = max(1, UDSL_NUM_CELLS(vcc->qos.rxtp.max_sdu)) * ATM_CELL_PAYLOAD;
 842         if (!(new->sarb = alloc_skb(max_pdu, GFP_KERNEL))) {
 843                 dbg("udsl_atm_open: no memory for SAR buffer!");
 844                 kfree(new);
 845                 up(&instance->serialize);
 846                 return -ENOMEM;
 847         }
 848
 849         vcc->dev_data = new;
 850
 851         tasklet_disable(&instance->receive_tasklet);
 852         list_add(&new->list, &instance->vcc_list);
 853         tasklet_enable(&instance->receive_tasklet);
 854
 855         set_bit(ATM_VF_ADDR, &vcc->flags);
 856         set_bit(ATM_VF_PARTIAL, &vcc->flags);
 857         set_bit(ATM_VF_READY, &vcc->flags);
 858
 859         up(&instance->serialize);
 860
 861         tasklet_schedule(&instance->receive_tasklet);
 862
 863         dbg("udsl_atm_open: allocated vcc data 0x%p (max_pdu: %u)", new, max_pdu);
 864
 865         return 0;
 866 }
 867
 868 static void udsl_atm_close(struct atm_vcc *vcc)
 869 {
 870         struct udsl_instance_data *instance = vcc->dev->dev_data;
 871         struct udsl_vcc_data *vcc_data = vcc->dev_data;
 872
 873         dbg("udsl_atm_close called");
 874
 875         if (!instance || !vcc_data) {
 876                 dbg("udsl_atm_close: NULL data!");
 877                 return;
 878         }
 879
 880         dbg("udsl_atm_close: deallocating vcc 0x%p with vpi %d vci %d",
 881             vcc_data, vcc_data->vpi, vcc_data->vci);
 882
 883         udsl_cancel_send(instance, vcc);
 884
 885         down(&instance->serialize);     /* vs self, udsl_atm_open */
 886
 887         tasklet_disable(&instance->receive_tasklet);
 888         list_del(&vcc_data->list);
 889         tasklet_enable(&instance->receive_tasklet);
 890
 891         kfree_skb(vcc_data->sarb);
 892         vcc_data->sarb = NULL;
 893
 894         kfree(vcc_data);
 895         vcc->dev_data = NULL;
 896
 897         vcc->vpi = ATM_VPI_UNSPEC;
 898         vcc->vci = ATM_VCI_UNSPEC;
 899         clear_bit(ATM_VF_READY, &vcc->flags);
 900         clear_bit(ATM_VF_PARTIAL, &vcc->flags);
 901         clear_bit(ATM_VF_ADDR, &vcc->flags);
 902
 903         up(&instance->serialize);
 904
 905         dbg("udsl_atm_close successful");
 906 }
 907
 908 static int udsl_atm_ioctl(struct atm_dev *dev, unsigned int cmd,
 909                           void __user * arg)
 910 {
 911         switch (cmd) {
 912         case ATM_QUERYLOOP:
 913                 return put_user(ATM_LM_NONE, (int __user *)arg) ? -EFAULT : 0;
 914         default:
 915                 return -ENOIOCTLCMD;
 916         }
 917 }
 918
 919 /**********
 920 **  USB  **
 921 **********/
 922
 923 int udsl_instance_setup(struct usb_device *dev,
 924                         struct udsl_instance_data *instance)
 925 {
 926         char *buf;
 927         int i, length;
 928
 929         kref_init(&instance->refcount); /* one for USB */
 930         udsl_get_instance(instance);    /* one for ATM */
 931
 932         init_MUTEX(&instance->serialize);
 933
 934         instance->usb_dev = dev;
 935
 936         INIT_LIST_HEAD(&instance->vcc_list);
 937
 938         instance->status = UDSL_NO_FIRMWARE;
 939         init_waitqueue_head(&instance->firmware_waiters);
 940
 941         spin_lock_init(&instance->receive_lock);
 942         INIT_LIST_HEAD(&instance->spare_receivers);
 943         INIT_LIST_HEAD(&instance->filled_receive_buffers);
 944
 945         tasklet_init(&instance->receive_tasklet, udsl_process_receive, (unsigned long)instance);
 946         INIT_LIST_HEAD(&instance->spare_receive_buffers);
 947
 948         skb_queue_head_init(&instance->sndqueue);
 949
 950         spin_lock_init(&instance->send_lock);
 951         INIT_LIST_HEAD(&instance->spare_senders);
 952         INIT_LIST_HEAD(&instance->spare_send_buffers);
 953
 954         tasklet_init(&instance->send_tasklet, udsl_process_send,
 955                      (unsigned long)instance);
 956         INIT_LIST_HEAD(&instance->filled_send_buffers);
 957
 958         /* receive init */
 959         for (i = 0; i < num_rcv_urbs; i++) {
 960                 struct udsl_receiver *rcv = &(instance->receivers[i]);
 961
 962                 if (!(rcv->urb = usb_alloc_urb(0, GFP_KERNEL))) {
 963                         dbg("udsl_usb_probe: no memory for receive urb %d!", i);
 964                         goto fail;
 965                 }
 966
 967                 rcv->instance = instance;
 968
 969                 list_add(&rcv->list, &instance->spare_receivers);
 970         }
 971
 972         for (i = 0; i < num_rcv_bufs; i++) {
 973                 struct udsl_receive_buffer *buf =
 974                     &(instance->receive_buffers[i]);
 975
 976                 buf->base = kmalloc(rcv_buf_size * (ATM_CELL_SIZE + instance->rcv_padding),
 977                                     GFP_KERNEL);
 978                 if (!buf->base) {
 979                         dbg("udsl_usb_probe: no memory for receive buffer %d!", i);
 980                         goto fail;
 981                 }
 982
 983                 list_add(&buf->list, &instance->spare_receive_buffers);
 984         }
 985
 986         /* send init */
 987         for (i = 0; i < num_snd_urbs; i++) {
 988                 struct udsl_sender *snd = &(instance->senders[i]);
 989
 990                 if (!(snd->urb = usb_alloc_urb(0, GFP_KERNEL))) {
 991                         dbg("udsl_usb_probe: no memory for send urb %d!", i);
 992                         goto fail;
 993                 }
 994
 995                 snd->instance = instance;
 996
 997                 list_add(&snd->list, &instance->spare_senders);
 998         }
 999
1000         for (i = 0; i < num_snd_bufs; i++) {
1001                 struct udsl_send_buffer *buf = &(instance->send_buffers[i]);
1002
1003                 buf->base = kmalloc(snd_buf_size * (ATM_CELL_SIZE + instance->snd_padding),
1004                                     GFP_KERNEL);
1005                 if (!buf->base) {
1006                         dbg("udsl_usb_probe: no memory for send buffer %d!", i);
1007                         goto fail;
1008                 }
1009
1010                 list_add(&buf->list, &instance->spare_send_buffers);
1011         }
1012
1013         /* ATM init */
1014         instance->atm_dev = atm_dev_register(instance->driver_name,
1015                                              &udsl_atm_devops, -1, NULL);
1016         if (!instance->atm_dev) {
1017                 dbg("udsl_usb_probe: failed to register ATM device!");
1018                 goto fail;
1019         }
1020
1021         instance->atm_dev->ci_range.vpi_bits = ATM_CI_MAX;
1022         instance->atm_dev->ci_range.vci_bits = ATM_CI_MAX;
1023         instance->atm_dev->signal = ATM_PHY_SIG_UNKNOWN;
1024
1025         /* temp init ATM device, set to 128kbit */
1026         instance->atm_dev->link_rate = 128 * 1000 / 424;
1027
1028         /* device description */
1029         buf = instance->description;
1030         length = sizeof(instance->description);
1031
1032         if ((i = usb_string(dev, dev->descriptor.iProduct, buf, length)) < 0)
1033                 goto finish;
1034
1035         buf += i;
1036         length -= i;
1037
1038         i = scnprintf(buf, length, " (");
1039         buf += i;
1040         length -= i;
1041
1042         if (length <= 0 || (i = usb_make_path(dev, buf, length)) < 0)
1043                 goto finish;
1044
1045         buf += i;
1046         length -= i;
1047
1048         snprintf(buf, length, ")");
1049
1050  finish:
1051         /* ready for ATM callbacks */
1052         wmb();
1053         instance->atm_dev->dev_data = instance;
1054
1055         usb_get_dev(dev);
1056
1057         return 0;
1058
1059  fail:
1060         for (i = 0; i < num_snd_bufs; i++)
1061                 kfree(instance->send_buffers[i].base);
1062
1063         for (i = 0; i < num_snd_urbs; i++)
1064                 usb_free_urb(instance->senders[i].urb);
1065
1066         for (i = 0; i < num_rcv_bufs; i++)
1067                 kfree(instance->receive_buffers[i].base);
1068
1069         for (i = 0; i < num_rcv_urbs; i++)
1070                 usb_free_urb(instance->receivers[i].urb);
1071
1072         return -ENOMEM;
1073 }
1074
1075 void udsl_instance_disconnect(struct udsl_instance_data *instance)
1076 {
1077         int i;
1078
1079         dbg("udsl_instance_disconnect entered");
1080
1081         if (!instance) {
1082                 dbg("udsl_instance_disconnect: NULL instance!");
1083                 return;
1084         }
1085
1086         /* receive finalize */
1087         tasklet_disable(&instance->receive_tasklet);
1088
1089         for (i = 0; i < num_rcv_urbs; i++)
1090                 usb_kill_urb(instance->receivers[i].urb);
1091
1092         /* no need to take the spinlock */
1093         INIT_LIST_HEAD(&instance->filled_receive_buffers);
1094         INIT_LIST_HEAD(&instance->spare_receive_buffers);
1095
1096         tasklet_enable(&instance->receive_tasklet);
1097
1098         for (i = 0; i < num_rcv_urbs; i++)
1099                 usb_free_urb(instance->receivers[i].urb);
1100
1101         for (i = 0; i < num_rcv_bufs; i++)
1102                 kfree(instance->receive_buffers[i].base);
1103
1104         /* send finalize */
1105         tasklet_disable(&instance->send_tasklet);
1106
1107         for (i = 0; i < num_snd_urbs; i++)
1108                 usb_kill_urb(instance->senders[i].urb);
1109
1110         /* no need to take the spinlock */
1111         INIT_LIST_HEAD(&instance->spare_senders);
1112         INIT_LIST_HEAD(&instance->spare_send_buffers);
1113         instance->current_buffer = NULL;
1114
1115         tasklet_enable(&instance->send_tasklet);
1116
1117         for (i = 0; i < num_snd_urbs; i++)
1118                 usb_free_urb(instance->senders[i].urb);
1119
1120         for (i = 0; i < num_snd_bufs; i++)
1121                 kfree(instance->send_buffers[i].base);
1122
1123         /* ATM finalize */
1124         shutdown_atm_dev(instance->atm_dev);
1125 }
1126
1127 EXPORT_SYMBOL_GPL(udsl_get_instance);
1128 EXPORT_SYMBOL_GPL(udsl_put_instance);
1129 EXPORT_SYMBOL_GPL(udsl_instance_setup);
1130 EXPORT_SYMBOL_GPL(udsl_instance_disconnect);
1131
1132 /***********
1133 **  init  **
1134 ***********/
1135
1136 static int __init udsl_usb_init(void)
1137 {
1138         dbg("udsl_usb_init: driver version " DRIVER_VERSION);
1139
1140         if (sizeof(struct udsl_control) > sizeof(((struct sk_buff *) 0)->cb)) {
1141                 printk(KERN_ERR __FILE__ ": unusable with this kernel!\n");
1142                 return -EIO;
1143         }
1144
1145         if ((num_rcv_urbs > UDSL_MAX_RCV_URBS)
1146             || (num_snd_urbs > UDSL_MAX_SND_URBS)
1147             || (num_rcv_bufs > UDSL_MAX_RCV_BUFS)
1148             || (num_snd_bufs > UDSL_MAX_SND_BUFS)
1149             || (rcv_buf_size > UDSL_MAX_RCV_BUF_SIZE)
1150             || (snd_buf_size > UDSL_MAX_SND_BUF_SIZE))
1151                 return -EINVAL;
1152
1153         return 0;
1154 }
1155
1156 static void __exit udsl_usb_exit(void)
1157 {
1158 }
1159
1160 module_init(udsl_usb_init);
1161 module_exit(udsl_usb_exit);
1162
1163 MODULE_AUTHOR(DRIVER_AUTHOR);
1164 MODULE_DESCRIPTION(DRIVER_DESC);
1165 MODULE_LICENSE("GPL");
1166 MODULE_VERSION(DRIVER_VERSION);
1167
1168 /************
1169 **  debug  **
1170 ************/
1171
1172 #ifdef VERBOSE_DEBUG
1173 static int udsl_print_packet(const unsigned char *data, int len)
1174 {
1175         unsigned char buffer[256];
1176         int i = 0, j = 0;
1177
1178         for (i = 0; i < len;) {
1179                 buffer[0] = '\0';
1180                 sprintf(buffer, "%.3d :", i);
1181                 for (j = 0; (j < 16) && (i < len); j++, i++) {
1182                         sprintf(buffer, "%s %2.2x", buffer, data[i]);
1183                 }
1184                 dbg("%s", buffer);
1185         }
1186         return i;
1187 }
1188 #endif