git.oblomov.eu Git - linux-2.6/blob - 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/netdevice.h>
  76 #include <linux/proc_fs.h>
  77 #include <linux/sched.h>
  78 #include <linux/signal.h>
  79 #include <linux/slab.h>
  80 #include <linux/stat.h>
  81 #include <linux/timer.h>
  82 #include <linux/wait.h>
  83 #include <linux/kthread.h>
  84
  85 #ifdef VERBOSE_DEBUG
  86 static int usbatm_print_packet(const unsigned char *data, int len);
  87 #define PACKETDEBUG(arg...)     usbatm_print_packet (arg)
  88 #define vdbg(arg...)            dbg (arg)
  89 #else
  90 #define PACKETDEBUG(arg...)
  91 #define vdbg(arg...)
  92 #endif
  93
  94 #define DRIVER_AUTHOR   "Johan Verrept, Duncan Sands <duncan.sands@free.fr>"
  95 #define DRIVER_VERSION  "1.10"
  96 #define DRIVER_DESC     "Generic USB ATM/DSL I/O, version " DRIVER_VERSION
  97
  98 static const char usbatm_driver_name[] = "usbatm";
  99
 100 #define UDSL_MAX_RCV_URBS               16
 101 #define UDSL_MAX_SND_URBS               16
 102 #define UDSL_MAX_BUF_SIZE               65536
 103 #define UDSL_DEFAULT_RCV_URBS           4
 104 #define UDSL_DEFAULT_SND_URBS           4
 105 #define UDSL_DEFAULT_RCV_BUF_SIZE       3392    /* 64 * ATM_CELL_SIZE */
 106 #define UDSL_DEFAULT_SND_BUF_SIZE       3392    /* 64 * ATM_CELL_SIZE */
 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_bytes = UDSL_DEFAULT_RCV_BUF_SIZE;
 115 static unsigned int snd_buf_bytes = 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_bytes, uint, S_IRUGO);
 130 MODULE_PARM_DESC(rcv_buf_bytes,
 131                  "Size of the buffers used for reception, in bytes (range: 1-"
 132                  __MODULE_STRING(UDSL_MAX_BUF_SIZE) ", default: "
 133                  __MODULE_STRING(UDSL_DEFAULT_RCV_BUF_SIZE) ")");
 134
 135 module_param(snd_buf_bytes, uint, S_IRUGO);
 136 MODULE_PARM_DESC(snd_buf_bytes,
 137                  "Size of the buffers used for transmission, in bytes (range: 1-"
 138                  __MODULE_STRING(UDSL_MAX_BUF_SIZE) ", default: "
 139                  __MODULE_STRING(UDSL_DEFAULT_SND_BUF_SIZE) ")");
 140
 141
 142 /* receive */
 143
 144 struct usbatm_vcc_data {
 145         /* vpi/vci lookup */
 146         struct list_head list;
 147         short vpi;
 148         int vci;
 149         struct atm_vcc *vcc;
 150
 151         /* raw cell reassembly */
 152         struct sk_buff *sarb;
 153 };
 154
 155
 156 /* send */
 157
 158 struct usbatm_control {
 159         struct atm_skb_data atm;
 160         u32 len;
 161         u32 crc;
 162 };
 163
 164 #define UDSL_SKB(x)             ((struct usbatm_control *)(x)->cb)
 165
 166
 167 /* ATM */
 168
 169 static void usbatm_atm_dev_close(struct atm_dev *atm_dev);
 170 static int usbatm_atm_open(struct atm_vcc *vcc);
 171 static void usbatm_atm_close(struct atm_vcc *vcc);
 172 static int usbatm_atm_ioctl(struct atm_dev *atm_dev, unsigned int cmd, void __user * arg);
 173 static int usbatm_atm_send(struct atm_vcc *vcc, struct sk_buff *skb);
 174 static int usbatm_atm_proc_read(struct atm_dev *atm_dev, loff_t * pos, char *page);
 175
 176 static struct atmdev_ops usbatm_atm_devops = {
 177         .dev_close      = usbatm_atm_dev_close,
 178         .open           = usbatm_atm_open,
 179         .close          = usbatm_atm_close,
 180         .ioctl          = usbatm_atm_ioctl,
 181         .send           = usbatm_atm_send,
 182         .proc_read      = usbatm_atm_proc_read,
 183         .owner          = THIS_MODULE,
 184 };
 185
 186
 187 /***********
 188 **  misc  **
 189 ***********/
 190
 191 static inline unsigned int usbatm_pdu_length(unsigned int length)
 192 {
 193         length += ATM_CELL_PAYLOAD - 1 + ATM_AAL5_TRAILER;
 194         return length - length % ATM_CELL_PAYLOAD;
 195 }
 196
 197 static inline void usbatm_pop(struct atm_vcc *vcc, struct sk_buff *skb)
 198 {
 199         if (vcc->pop)
 200                 vcc->pop(vcc, skb);
 201         else
 202                 dev_kfree_skb_any(skb);
 203 }
 204
 205
 206 /***********
 207 **  urbs  **
 208 ************/
 209
 210 static struct urb *usbatm_pop_urb(struct usbatm_channel *channel)
 211 {
 212         struct urb *urb;
 213
 214         spin_lock_irq(&channel->lock);
 215         if (list_empty(&channel->list)) {
 216                 spin_unlock_irq(&channel->lock);
 217                 return NULL;
 218         }
 219
 220         urb = list_entry(channel->list.next, struct urb, urb_list);
 221         list_del(&urb->urb_list);
 222         spin_unlock_irq(&channel->lock);
 223
 224         return urb;
 225 }
 226
 227 static int usbatm_submit_urb(struct urb *urb)
 228 {
 229         struct usbatm_channel *channel = urb->context;
 230         int ret;
 231
 232         vdbg("%s: submitting urb 0x%p, size %u",
 233              __func__, urb, urb->transfer_buffer_length);
 234
 235         ret = usb_submit_urb(urb, GFP_ATOMIC);
 236         if (ret) {
 237                 if (printk_ratelimit())
 238                         atm_warn(channel->usbatm, "%s: urb 0x%p submission failed (%d)!\n",
 239                                 __func__, urb, ret);
 240
 241                 /* consider all errors transient and return the buffer back to the queue */
 242                 urb->status = -EAGAIN;
 243                 spin_lock_irq(&channel->lock);
 244
 245                 /* must add to the front when sending; doesn't matter when receiving */
 246                 list_add(&urb->urb_list, &channel->list);
 247
 248                 spin_unlock_irq(&channel->lock);
 249
 250                 /* make sure the channel doesn't stall */
 251                 mod_timer(&channel->delay, jiffies + msecs_to_jiffies(THROTTLE_MSECS));
 252         }
 253
 254         return ret;
 255 }
 256
 257 static void usbatm_complete(struct urb *urb)
 258 {
 259         struct usbatm_channel *channel = urb->context;
 260         unsigned long flags;
 261         int status = urb->status;
 262
 263         vdbg("%s: urb 0x%p, status %d, actual_length %d",
 264              __func__, urb, status, urb->actual_length);
 265
 266         /* usually in_interrupt(), but not always */
 267         spin_lock_irqsave(&channel->lock, flags);
 268
 269         /* must add to the back when receiving; doesn't matter when sending */
 270         list_add_tail(&urb->urb_list, &channel->list);
 271
 272         spin_unlock_irqrestore(&channel->lock, flags);
 273
 274         if (unlikely(status) &&
 275                         (!(channel->usbatm->flags & UDSL_IGNORE_EILSEQ) ||
 276                          status != -EILSEQ ))
 277         {
 278                 if (status == -ESHUTDOWN)
 279                         return;
 280
 281                 if (printk_ratelimit())
 282                         atm_warn(channel->usbatm, "%s: urb 0x%p failed (%d)!\n",
 283                                 __func__, urb, status);
 284                 /* throttle processing in case of an error */
 285                 mod_timer(&channel->delay, jiffies + msecs_to_jiffies(THROTTLE_MSECS));
 286         } else
 287                 tasklet_schedule(&channel->tasklet);
 288 }
 289
 290
 291 /*************
 292 **  decode  **
 293 *************/
 294
 295 static inline struct usbatm_vcc_data *usbatm_find_vcc(struct usbatm_data *instance,
 296                                                   short vpi, int vci)
 297 {
 298         struct usbatm_vcc_data *vcc_data;
 299
 300         list_for_each_entry(vcc_data, &instance->vcc_list, list)
 301                 if ((vcc_data->vci == vci) && (vcc_data->vpi == vpi))
 302                         return vcc_data;
 303         return NULL;
 304 }
 305
 306 static void usbatm_extract_one_cell(struct usbatm_data *instance, unsigned char *source)
 307 {
 308         struct atm_vcc *vcc;
 309         struct sk_buff *sarb;
 310         short vpi = ((source[0] & 0x0f) << 4)  | (source[1] >> 4);
 311         int vci = ((source[1] & 0x0f) << 12) | (source[2] << 4) | (source[3] >> 4);
 312         u8 pti = ((source[3] & 0xe) >> 1);
 313
 314         vdbg("%s: vpi %hd, vci %d, pti %d", __func__, vpi, vci, pti);
 315
 316         if ((vci != instance->cached_vci) || (vpi != instance->cached_vpi)) {
 317                 instance->cached_vpi = vpi;
 318                 instance->cached_vci = vci;
 319
 320                 instance->cached_vcc = usbatm_find_vcc(instance, vpi, vci);
 321
 322                 if (!instance->cached_vcc)
 323                         atm_rldbg(instance, "%s: unknown vpi/vci (%hd/%d)!\n", __func__, vpi, vci);
 324         }
 325
 326         if (!instance->cached_vcc)
 327                 return;
 328
 329         vcc = instance->cached_vcc->vcc;
 330
 331         /* OAM F5 end-to-end */
 332         if (pti == ATM_PTI_E2EF5) {
 333                 if (printk_ratelimit())
 334                         atm_warn(instance, "%s: OAM not supported (vpi %d, vci %d)!\n",
 335                                 __func__, vpi, vci);
 336                 atomic_inc(&vcc->stats->rx_err);
 337                 return;
 338         }
 339
 340         sarb = instance->cached_vcc->sarb;
 341
 342         if (sarb->tail + ATM_CELL_PAYLOAD > sarb->end) {
 343                 atm_rldbg(instance, "%s: buffer overrun (sarb->len %u, vcc: 0x%p)!\n",
 344                                 __func__, sarb->len, vcc);
 345                 /* discard cells already received */
 346                 skb_trim(sarb, 0);
 347                 UDSL_ASSERT(sarb->tail + ATM_CELL_PAYLOAD <= sarb->end);
 348         }
 349
 350         memcpy(skb_tail_pointer(sarb), source + ATM_CELL_HEADER, ATM_CELL_PAYLOAD);
 351         __skb_put(sarb, ATM_CELL_PAYLOAD);
 352
 353         if (pti & 1) {
 354                 struct sk_buff *skb;
 355                 unsigned int length;
 356                 unsigned int pdu_length;
 357
 358                 length = (source[ATM_CELL_SIZE - 6] << 8) + source[ATM_CELL_SIZE - 5];
 359
 360                 /* guard against overflow */
 361                 if (length > ATM_MAX_AAL5_PDU) {
 362                         atm_rldbg(instance, "%s: bogus length %u (vcc: 0x%p)!\n",
 363                                   __func__, length, vcc);
 364                         atomic_inc(&vcc->stats->rx_err);
 365                         goto out;
 366                 }
 367
 368                 pdu_length = usbatm_pdu_length(length);
 369
 370                 if (sarb->len < pdu_length) {
 371                         atm_rldbg(instance, "%s: bogus pdu_length %u (sarb->len: %u, vcc: 0x%p)!\n",
 372                                   __func__, pdu_length, sarb->len, vcc);
 373                         atomic_inc(&vcc->stats->rx_err);
 374                         goto out;
 375                 }
 376
 377                 if (crc32_be(~0, skb_tail_pointer(sarb) - pdu_length, pdu_length) != 0xc704dd7b) {
 378                         atm_rldbg(instance, "%s: packet failed crc check (vcc: 0x%p)!\n",
 379                                   __func__, vcc);
 380                         atomic_inc(&vcc->stats->rx_err);
 381                         goto out;
 382                 }
 383
 384                 vdbg("%s: got packet (length: %u, pdu_length: %u, vcc: 0x%p)", __func__, length, pdu_length, vcc);
 385
 386                 if (!(skb = dev_alloc_skb(length))) {
 387                         if (printk_ratelimit())
 388                                 atm_err(instance, "%s: no memory for skb (length: %u)!\n",
 389                                         __func__, length);
 390                         atomic_inc(&vcc->stats->rx_drop);
 391                         goto out;
 392                 }
 393
 394                 vdbg("%s: allocated new sk_buff (skb: 0x%p, skb->truesize: %u)", __func__, skb, skb->truesize);
 395
 396                 if (!atm_charge(vcc, skb->truesize)) {
 397                         atm_rldbg(instance, "%s: failed atm_charge (skb->truesize: %u)!\n",
 398                                   __func__, skb->truesize);
 399                         dev_kfree_skb_any(skb);
 400                         goto out;       /* atm_charge increments rx_drop */
 401                 }
 402
 403                 skb_copy_to_linear_data(skb,
 404                                         skb_tail_pointer(sarb) - pdu_length,
 405                                         length);
 406                 __skb_put(skb, length);
 407
 408                 vdbg("%s: sending skb 0x%p, skb->len %u, skb->truesize %u",
 409                      __func__, skb, skb->len, skb->truesize);
 410
 411                 PACKETDEBUG(skb->data, skb->len);
 412
 413                 vcc->push(vcc, skb);
 414
 415                 atomic_inc(&vcc->stats->rx);
 416         out:
 417                 skb_trim(sarb, 0);
 418         }
 419 }
 420
 421 static void usbatm_extract_cells(struct usbatm_data *instance,
 422                 unsigned char *source, unsigned int avail_data)
 423 {
 424         unsigned int stride = instance->rx_channel.stride;
 425         unsigned int buf_usage = instance->buf_usage;
 426
 427         /* extract cells from incoming data, taking into account that
 428          * the length of avail data may not be a multiple of stride */
 429
 430         if (buf_usage > 0) {
 431                 /* we have a partially received atm cell */
 432                 unsigned char *cell_buf = instance->cell_buf;
 433                 unsigned int space_left = stride - buf_usage;
 434
 435                 UDSL_ASSERT(buf_usage <= stride);
 436
 437                 if (avail_data >= space_left) {
 438                         /* add new data and process cell */
 439                         memcpy(cell_buf + buf_usage, source, space_left);
 440                         source += space_left;
 441                         avail_data -= space_left;
 442                         usbatm_extract_one_cell(instance, cell_buf);
 443                         instance->buf_usage = 0;
 444                 } else {
 445                         /* not enough data to fill the cell */
 446                         memcpy(cell_buf + buf_usage, source, avail_data);
 447                         instance->buf_usage = buf_usage + avail_data;
 448                         return;
 449                 }
 450         }
 451
 452         for (; avail_data >= stride; avail_data -= stride, source += stride)
 453                 usbatm_extract_one_cell(instance, source);
 454
 455         if (avail_data > 0) {
 456                 /* length was not a multiple of stride -
 457                  * save remaining data for next call */
 458                 memcpy(instance->cell_buf, source, avail_data);
 459                 instance->buf_usage = avail_data;
 460         }
 461 }
 462
 463
 464 /*************
 465 **  encode  **
 466 *************/
 467
 468 static unsigned int usbatm_write_cells(struct usbatm_data *instance,
 469                                        struct sk_buff *skb,
 470                                        u8 *target, unsigned int avail_space)
 471 {
 472         struct usbatm_control *ctrl = UDSL_SKB(skb);
 473         struct atm_vcc *vcc = ctrl->atm.vcc;
 474         unsigned int bytes_written;
 475         unsigned int stride = instance->tx_channel.stride;
 476
 477         vdbg("%s: skb->len=%d, avail_space=%u", __func__, skb->len, avail_space);
 478         UDSL_ASSERT(!(avail_space % stride));
 479
 480         for (bytes_written = 0; bytes_written < avail_space && ctrl->len;
 481              bytes_written += stride, target += stride) {
 482                 unsigned int data_len = min_t(unsigned int, skb->len, ATM_CELL_PAYLOAD);
 483                 unsigned int left = ATM_CELL_PAYLOAD - data_len;
 484                 u8 *ptr = target;
 485
 486                 ptr[0] = vcc->vpi >> 4;
 487                 ptr[1] = (vcc->vpi << 4) | (vcc->vci >> 12);
 488                 ptr[2] = vcc->vci >> 4;
 489                 ptr[3] = vcc->vci << 4;
 490                 ptr[4] = 0xec;
 491                 ptr += ATM_CELL_HEADER;
 492
 493                 skb_copy_from_linear_data(skb, ptr, data_len);
 494                 ptr += data_len;
 495                 __skb_pull(skb, data_len);
 496
 497                 if(!left)
 498                         continue;
 499
 500                 memset(ptr, 0, left);
 501
 502                 if (left >= ATM_AAL5_TRAILER) { /* trailer will go in this cell */
 503                         u8 *trailer = target + ATM_CELL_SIZE - ATM_AAL5_TRAILER;
 504                         /* trailer[0] = 0;              UU = 0 */
 505                         /* trailer[1] = 0;              CPI = 0 */
 506                         trailer[2] = ctrl->len >> 8;
 507                         trailer[3] = ctrl->len;
 508
 509                         ctrl->crc = ~ crc32_be(ctrl->crc, ptr, left - 4);
 510
 511                         trailer[4] = ctrl->crc >> 24;
 512                         trailer[5] = ctrl->crc >> 16;
 513                         trailer[6] = ctrl->crc >> 8;
 514                         trailer[7] = ctrl->crc;
 515
 516                         target[3] |= 0x2;       /* adjust PTI */
 517
 518                         ctrl->len = 0;          /* tag this skb finished */
 519                 }
 520                 else
 521                         ctrl->crc = crc32_be(ctrl->crc, ptr, left);
 522         }
 523
 524         return bytes_written;
 525 }
 526
 527
 528 /**************
 529 **  receive  **
 530 **************/
 531
 532 static void usbatm_rx_process(unsigned long data)
 533 {
 534         struct usbatm_data *instance = (struct usbatm_data *)data;
 535         struct urb *urb;
 536
 537         while ((urb = usbatm_pop_urb(&instance->rx_channel))) {
 538                 vdbg("%s: processing urb 0x%p", __func__, urb);
 539
 540                 if (usb_pipeisoc(urb->pipe)) {
 541                         unsigned char *merge_start = NULL;
 542                         unsigned int merge_length = 0;
 543                         const unsigned int packet_size = instance->rx_channel.packet_size;
 544                         int i;
 545
 546                         for (i = 0; i < urb->number_of_packets; i++) {
 547                                 if (!urb->iso_frame_desc[i].status) {
 548                                         unsigned int actual_length = urb->iso_frame_desc[i].actual_length;
 549
 550                                         UDSL_ASSERT(actual_length <= packet_size);
 551
 552                                         if (!merge_length)
 553                                                 merge_start = (unsigned char *)urb->transfer_buffer + urb->iso_frame_desc[i].offset;
 554                                         merge_length += actual_length;
 555                                         if (merge_length && (actual_length < packet_size)) {
 556                                                 usbatm_extract_cells(instance, merge_start, merge_length);
 557                                                 merge_length = 0;
 558                                         }
 559                                 } else {
 560                                         atm_rldbg(instance, "%s: status %d in frame %d!\n", __func__, urb->status, i);
 561                                         if (merge_length)
 562                                                 usbatm_extract_cells(instance, merge_start, merge_length);
 563                                         merge_length = 0;
 564                                         instance->buf_usage = 0;
 565                                 }
 566                         }
 567
 568                         if (merge_length)
 569                                 usbatm_extract_cells(instance, merge_start, merge_length);
 570                 } else
 571                         if (!urb->status)
 572                                 usbatm_extract_cells(instance, urb->transfer_buffer, urb->actual_length);
 573                         else
 574                                 instance->buf_usage = 0;
 575
 576                 if (usbatm_submit_urb(urb))
 577                         return;
 578         }
 579 }
 580
 581
 582 /***********
 583 **  send  **
 584 ***********/
 585
 586 static void usbatm_tx_process(unsigned long data)
 587 {
 588         struct usbatm_data *instance = (struct usbatm_data *)data;
 589         struct sk_buff *skb = instance->current_skb;
 590         struct urb *urb = NULL;
 591         const unsigned int buf_size = instance->tx_channel.buf_size;
 592         unsigned int bytes_written = 0;
 593         u8 *buffer = NULL;
 594
 595         if (!skb)
 596                 skb = skb_dequeue(&instance->sndqueue);
 597
 598         while (skb) {
 599                 if (!urb) {
 600                         urb = usbatm_pop_urb(&instance->tx_channel);
 601                         if (!urb)
 602                                 break;          /* no more senders */
 603                         buffer = urb->transfer_buffer;
 604                         bytes_written = (urb->status == -EAGAIN) ?
 605                                 urb->transfer_buffer_length : 0;
 606                 }
 607
 608                 bytes_written += usbatm_write_cells(instance, skb,
 609                                                   buffer + bytes_written,
 610                                                   buf_size - bytes_written);
 611
 612                 vdbg("%s: wrote %u bytes from skb 0x%p to urb 0x%p",
 613                      __func__, bytes_written, skb, urb);
 614
 615                 if (!UDSL_SKB(skb)->len) {
 616                         struct atm_vcc *vcc = UDSL_SKB(skb)->atm.vcc;
 617
 618                         usbatm_pop(vcc, skb);
 619                         atomic_inc(&vcc->stats->tx);
 620
 621                         skb = skb_dequeue(&instance->sndqueue);
 622                 }
 623
 624                 if (bytes_written == buf_size || (!skb && bytes_written)) {
 625                         urb->transfer_buffer_length = bytes_written;
 626
 627                         if (usbatm_submit_urb(urb))
 628                                 break;
 629                         urb = NULL;
 630                 }
 631         }
 632
 633         instance->current_skb = skb;
 634 }
 635
 636 static void usbatm_cancel_send(struct usbatm_data *instance,
 637                                struct atm_vcc *vcc)
 638 {
 639         struct sk_buff *skb, *n;
 640
 641         atm_dbg(instance, "%s entered\n", __func__);
 642         spin_lock_irq(&instance->sndqueue.lock);
 643         for (skb = instance->sndqueue.next, n = skb->next;
 644              skb != (struct sk_buff *)&instance->sndqueue;
 645              skb = n, n = skb->next)
 646                 if (UDSL_SKB(skb)->atm.vcc == vcc) {
 647                         atm_dbg(instance, "%s: popping skb 0x%p\n", __func__, skb);
 648                         __skb_unlink(skb, &instance->sndqueue);
 649                         usbatm_pop(vcc, skb);
 650                 }
 651         spin_unlock_irq(&instance->sndqueue.lock);
 652
 653         tasklet_disable(&instance->tx_channel.tasklet);
 654         if ((skb = instance->current_skb) && (UDSL_SKB(skb)->atm.vcc == vcc)) {
 655                 atm_dbg(instance, "%s: popping current skb (0x%p)\n", __func__, skb);
 656                 instance->current_skb = NULL;
 657                 usbatm_pop(vcc, skb);
 658         }
 659         tasklet_enable(&instance->tx_channel.tasklet);
 660         atm_dbg(instance, "%s done\n", __func__);
 661 }
 662
 663 static int usbatm_atm_send(struct atm_vcc *vcc, struct sk_buff *skb)
 664 {
 665         struct usbatm_data *instance = vcc->dev->dev_data;
 666         struct usbatm_control *ctrl = UDSL_SKB(skb);
 667         int err;
 668
 669         vdbg("%s called (skb 0x%p, len %u)", __func__, skb, skb->len);
 670
 671         /* racy disconnection check - fine */
 672         if (!instance || instance->disconnected) {
 673 #ifdef DEBUG
 674                 if (printk_ratelimit())
 675                         printk(KERN_DEBUG "%s: %s!\n", __func__, instance ? "disconnected" : "NULL instance");
 676 #endif
 677                 err = -ENODEV;
 678                 goto fail;
 679         }
 680
 681         if (vcc->qos.aal != ATM_AAL5) {
 682                 atm_rldbg(instance, "%s: unsupported ATM type %d!\n", __func__, vcc->qos.aal);
 683                 err = -EINVAL;
 684                 goto fail;
 685         }
 686
 687         if (skb->len > ATM_MAX_AAL5_PDU) {
 688                 atm_rldbg(instance, "%s: packet too long (%d vs %d)!\n",
 689                                 __func__, skb->len, ATM_MAX_AAL5_PDU);
 690                 err = -EINVAL;
 691                 goto fail;
 692         }
 693
 694         PACKETDEBUG(skb->data, skb->len);
 695
 696         /* initialize the control block */
 697         ctrl->atm.vcc = vcc;
 698         ctrl->len = skb->len;
 699         ctrl->crc = crc32_be(~0, skb->data, skb->len);
 700
 701         skb_queue_tail(&instance->sndqueue, skb);
 702         tasklet_schedule(&instance->tx_channel.tasklet);
 703
 704         return 0;
 705
 706  fail:
 707         usbatm_pop(vcc, skb);
 708         return err;
 709 }
 710
 711
 712 /********************
 713 **  bean counting  **
 714 ********************/
 715
 716 static void usbatm_destroy_instance(struct kref *kref)
 717 {
 718         struct usbatm_data *instance = container_of(kref, struct usbatm_data, refcount);
 719
 720         dbg("%s", __func__);
 721
 722         tasklet_kill(&instance->rx_channel.tasklet);
 723         tasklet_kill(&instance->tx_channel.tasklet);
 724         usb_put_dev(instance->usb_dev);
 725         kfree(instance);
 726 }
 727
 728 static void usbatm_get_instance(struct usbatm_data *instance)
 729 {
 730         dbg("%s", __func__);
 731
 732         kref_get(&instance->refcount);
 733 }
 734
 735 static void usbatm_put_instance(struct usbatm_data *instance)
 736 {
 737         dbg("%s", __func__);
 738
 739         kref_put(&instance->refcount, usbatm_destroy_instance);
 740 }
 741
 742
 743 /**********
 744 **  ATM  **
 745 **********/
 746
 747 static void usbatm_atm_dev_close(struct atm_dev *atm_dev)
 748 {
 749         struct usbatm_data *instance = atm_dev->dev_data;
 750
 751         dbg("%s", __func__);
 752
 753         if (!instance)
 754                 return;
 755
 756         atm_dev->dev_data = NULL; /* catch bugs */
 757         usbatm_put_instance(instance);  /* taken in usbatm_atm_init */
 758 }
 759
 760 static int usbatm_atm_proc_read(struct atm_dev *atm_dev, loff_t * pos, char *page)
 761 {
 762         struct usbatm_data *instance = atm_dev->dev_data;
 763         int left = *pos;
 764
 765         if (!instance) {
 766                 dbg("%s: NULL instance!", __func__);
 767                 return -ENODEV;
 768         }
 769
 770         if (!left--)
 771                 return sprintf(page, "%s\n", instance->description);
 772
 773         if (!left--)
 774                 return sprintf(page, "MAC: %02x:%02x:%02x:%02x:%02x:%02x\n",
 775                                atm_dev->esi[0], atm_dev->esi[1],
 776                                atm_dev->esi[2], atm_dev->esi[3],
 777                                atm_dev->esi[4], atm_dev->esi[5]);
 778
 779         if (!left--)
 780                 return sprintf(page,
 781                                "AAL5: tx %d ( %d err ), rx %d ( %d err, %d drop )\n",
 782                                atomic_read(&atm_dev->stats.aal5.tx),
 783                                atomic_read(&atm_dev->stats.aal5.tx_err),
 784                                atomic_read(&atm_dev->stats.aal5.rx),
 785                                atomic_read(&atm_dev->stats.aal5.rx_err),
 786                                atomic_read(&atm_dev->stats.aal5.rx_drop));
 787
 788         if (!left--) {
 789                 if (instance->disconnected)
 790                         return sprintf(page, "Disconnected\n");
 791                 else
 792                         switch (atm_dev->signal) {
 793                         case ATM_PHY_SIG_FOUND:
 794                                 return sprintf(page, "Line up\n");
 795                         case ATM_PHY_SIG_LOST:
 796                                 return sprintf(page, "Line down\n");
 797                         default:
 798                                 return sprintf(page, "Line state unknown\n");
 799                         }
 800         }
 801
 802         return 0;
 803 }
 804
 805 static int usbatm_atm_open(struct atm_vcc *vcc)
 806 {
 807         struct usbatm_data *instance = vcc->dev->dev_data;
 808         struct usbatm_vcc_data *new = NULL;
 809         int ret;
 810         int vci = vcc->vci;
 811         short vpi = vcc->vpi;
 812
 813         if (!instance) {
 814                 dbg("%s: NULL data!", __func__);
 815                 return -ENODEV;
 816         }
 817
 818         atm_dbg(instance, "%s: vpi %hd, vci %d\n", __func__, vpi, vci);
 819
 820         /* only support AAL5 */
 821         if ((vcc->qos.aal != ATM_AAL5)) {
 822                 atm_warn(instance, "%s: unsupported ATM type %d!\n", __func__, vcc->qos.aal);
 823                 return -EINVAL;
 824         }
 825
 826         /* sanity checks */
 827         if ((vcc->qos.rxtp.max_sdu < 0) || (vcc->qos.rxtp.max_sdu > ATM_MAX_AAL5_PDU)) {
 828                 atm_dbg(instance, "%s: max_sdu %d out of range!\n", __func__, vcc->qos.rxtp.max_sdu);
 829                 return -EINVAL;
 830         }
 831
 832         mutex_lock(&instance->serialize);       /* vs self, usbatm_atm_close, usbatm_usb_disconnect */
 833
 834         if (instance->disconnected) {
 835                 atm_dbg(instance, "%s: disconnected!\n", __func__);
 836                 ret = -ENODEV;
 837                 goto fail;
 838         }
 839
 840         if (usbatm_find_vcc(instance, vpi, vci)) {
 841                 atm_dbg(instance, "%s: %hd/%d already in use!\n", __func__, vpi, vci);
 842                 ret = -EADDRINUSE;
 843                 goto fail;
 844         }
 845
 846         if (!(new = kzalloc(sizeof(struct usbatm_vcc_data), GFP_KERNEL))) {
 847                 atm_err(instance, "%s: no memory for vcc_data!\n", __func__);
 848                 ret = -ENOMEM;
 849                 goto fail;
 850         }
 851
 852         new->vcc = vcc;
 853         new->vpi = vpi;
 854         new->vci = vci;
 855
 856         new->sarb = alloc_skb(usbatm_pdu_length(vcc->qos.rxtp.max_sdu), GFP_KERNEL);
 857         if (!new->sarb) {
 858                 atm_err(instance, "%s: no memory for SAR buffer!\n", __func__);
 859                 ret = -ENOMEM;
 860                 goto fail;
 861         }
 862
 863         vcc->dev_data = new;
 864
 865         tasklet_disable(&instance->rx_channel.tasklet);
 866         instance->cached_vcc = new;
 867         instance->cached_vpi = vpi;
 868         instance->cached_vci = vci;
 869         list_add(&new->list, &instance->vcc_list);
 870         tasklet_enable(&instance->rx_channel.tasklet);
 871
 872         set_bit(ATM_VF_ADDR, &vcc->flags);
 873         set_bit(ATM_VF_PARTIAL, &vcc->flags);
 874         set_bit(ATM_VF_READY, &vcc->flags);
 875
 876         mutex_unlock(&instance->serialize);
 877
 878         atm_dbg(instance, "%s: allocated vcc data 0x%p\n", __func__, new);
 879
 880         return 0;
 881
 882 fail:
 883         kfree(new);
 884         mutex_unlock(&instance->serialize);
 885         return ret;
 886 }
 887
 888 static void usbatm_atm_close(struct atm_vcc *vcc)
 889 {
 890         struct usbatm_data *instance = vcc->dev->dev_data;
 891         struct usbatm_vcc_data *vcc_data = vcc->dev_data;
 892
 893         if (!instance || !vcc_data) {
 894                 dbg("%s: NULL data!", __func__);
 895                 return;
 896         }
 897
 898         atm_dbg(instance, "%s entered\n", __func__);
 899
 900         atm_dbg(instance, "%s: deallocating vcc 0x%p with vpi %d vci %d\n",
 901                 __func__, vcc_data, vcc_data->vpi, vcc_data->vci);
 902
 903         usbatm_cancel_send(instance, vcc);
 904
 905         mutex_lock(&instance->serialize);       /* vs self, usbatm_atm_open, usbatm_usb_disconnect */
 906
 907         tasklet_disable(&instance->rx_channel.tasklet);
 908         if (instance->cached_vcc == vcc_data) {
 909                 instance->cached_vcc = NULL;
 910                 instance->cached_vpi = ATM_VPI_UNSPEC;
 911                 instance->cached_vci = ATM_VCI_UNSPEC;
 912         }
 913         list_del(&vcc_data->list);
 914         tasklet_enable(&instance->rx_channel.tasklet);
 915
 916         kfree_skb(vcc_data->sarb);
 917         vcc_data->sarb = NULL;
 918
 919         kfree(vcc_data);
 920         vcc->dev_data = NULL;
 921
 922         vcc->vpi = ATM_VPI_UNSPEC;
 923         vcc->vci = ATM_VCI_UNSPEC;
 924         clear_bit(ATM_VF_READY, &vcc->flags);
 925         clear_bit(ATM_VF_PARTIAL, &vcc->flags);
 926         clear_bit(ATM_VF_ADDR, &vcc->flags);
 927
 928         mutex_unlock(&instance->serialize);
 929
 930         atm_dbg(instance, "%s successful\n", __func__);
 931 }
 932
 933 static int usbatm_atm_ioctl(struct atm_dev *atm_dev, unsigned int cmd,
 934                           void __user * arg)
 935 {
 936         struct usbatm_data *instance = atm_dev->dev_data;
 937
 938         if (!instance || instance->disconnected) {
 939                 dbg("%s: %s!", __func__, instance ? "disconnected" : "NULL instance");
 940                 return -ENODEV;
 941         }
 942
 943         switch (cmd) {
 944         case ATM_QUERYLOOP:
 945                 return put_user(ATM_LM_NONE, (int __user *)arg) ? -EFAULT : 0;
 946         default:
 947                 return -ENOIOCTLCMD;
 948         }
 949 }
 950
 951 static int usbatm_atm_init(struct usbatm_data *instance)
 952 {
 953         struct atm_dev *atm_dev;
 954         int ret, i;
 955
 956         /* ATM init.  The ATM initialization scheme suffers from an intrinsic race
 957          * condition: callbacks we register can be executed at once, before we have
 958          * initialized the struct atm_dev.  To protect against this, all callbacks
 959          * abort if atm_dev->dev_data is NULL. */
 960         atm_dev = atm_dev_register(instance->driver_name, &usbatm_atm_devops, -1, NULL);
 961         if (!atm_dev) {
 962                 usb_err(instance, "%s: failed to register ATM device!\n", __func__);
 963                 return -1;
 964         }
 965
 966         instance->atm_dev = atm_dev;
 967
 968         atm_dev->ci_range.vpi_bits = ATM_CI_MAX;
 969         atm_dev->ci_range.vci_bits = ATM_CI_MAX;
 970         atm_dev->signal = ATM_PHY_SIG_UNKNOWN;
 971
 972         /* temp init ATM device, set to 128kbit */
 973         atm_dev->link_rate = 128 * 1000 / 424;
 974
 975         ret = sysfs_create_link(&atm_dev->class_dev.kobj,
 976                                 &instance->usb_intf->dev.kobj, "device");
 977         if (ret) {
 978                 atm_err(instance, "%s: sysfs_create_link failed: %d\n",
 979                                         __func__, ret);
 980                 goto fail_sysfs;
 981         }
 982
 983         if (instance->driver->atm_start && ((ret = instance->driver->atm_start(instance, atm_dev)) < 0)) {
 984                 atm_err(instance, "%s: atm_start failed: %d!\n", __func__, ret);
 985                 goto fail;
 986         }
 987
 988         usbatm_get_instance(instance);  /* dropped in usbatm_atm_dev_close */
 989
 990         /* ready for ATM callbacks */
 991         mb();
 992         atm_dev->dev_data = instance;
 993
 994         /* submit all rx URBs */
 995         for (i = 0; i < num_rcv_urbs; i++)
 996                 usbatm_submit_urb(instance->urbs[i]);
 997
 998         return 0;
 999
1000  fail:
1001         sysfs_remove_link(&atm_dev->class_dev.kobj, "device");
1002  fail_sysfs:
1003         instance->atm_dev = NULL;
1004         atm_dev_deregister(atm_dev); /* usbatm_atm_dev_close will eventually be called */
1005         return ret;
1006 }
1007
1008
1009 /**********
1010 **  USB  **
1011 **********/
1012
1013 static int usbatm_do_heavy_init(void *arg)
1014 {
1015         struct usbatm_data *instance = arg;
1016         int ret;
1017
1018         allow_signal(SIGTERM);
1019         complete(&instance->thread_started);
1020
1021         ret = instance->driver->heavy_init(instance, instance->usb_intf);
1022
1023         if (!ret)
1024                 ret = usbatm_atm_init(instance);
1025
1026         mutex_lock(&instance->serialize);
1027         instance->thread = NULL;
1028         mutex_unlock(&instance->serialize);
1029
1030         complete_and_exit(&instance->thread_exited, ret);
1031 }
1032
1033 static int usbatm_heavy_init(struct usbatm_data *instance)
1034 {
1035         struct task_struct *t;
1036
1037         t = kthread_create(usbatm_do_heavy_init, instance,
1038                         instance->driver->driver_name);
1039         if (IS_ERR(t)) {
1040                 usb_err(instance, "%s: failed to create kernel_thread (%ld)!\n",
1041                                 __func__, PTR_ERR(t));
1042                 return PTR_ERR(t);
1043         }
1044
1045         instance->thread = t;
1046         wake_up_process(t);
1047         wait_for_completion(&instance->thread_started);
1048
1049         return 0;
1050 }
1051
1052 static void usbatm_tasklet_schedule(unsigned long data)
1053 {
1054         tasklet_schedule((struct tasklet_struct *) data);
1055 }
1056
1057 static void usbatm_init_channel(struct usbatm_channel *channel)
1058 {
1059         spin_lock_init(&channel->lock);
1060         INIT_LIST_HEAD(&channel->list);
1061         channel->delay.function = usbatm_tasklet_schedule;
1062         channel->delay.data = (unsigned long) &channel->tasklet;
1063         init_timer(&channel->delay);
1064 }
1065
1066 int usbatm_usb_probe(struct usb_interface *intf, const struct usb_device_id *id,
1067                      struct usbatm_driver *driver)
1068 {
1069         struct device *dev = &intf->dev;
1070         struct usb_device *usb_dev = interface_to_usbdev(intf);
1071         struct usbatm_data *instance;
1072         char *buf;
1073         int error = -ENOMEM;
1074         int i, length;
1075         unsigned int maxpacket, num_packets;
1076
1077         dev_dbg(dev, "%s: trying driver %s with vendor=%04x, product=%04x, ifnum %2d\n",
1078                         __func__, driver->driver_name,
1079                         le16_to_cpu(usb_dev->descriptor.idVendor),
1080                         le16_to_cpu(usb_dev->descriptor.idProduct),
1081                         intf->altsetting->desc.bInterfaceNumber);
1082
1083         /* instance init */
1084         instance = kzalloc(sizeof(*instance) + sizeof(struct urb *) * (num_rcv_urbs + num_snd_urbs), GFP_KERNEL);
1085         if (!instance) {
1086                 dev_err(dev, "%s: no memory for instance data!\n", __func__);
1087                 return -ENOMEM;
1088         }
1089
1090         /* public fields */
1091
1092         instance->driver = driver;
1093         snprintf(instance->driver_name, sizeof(instance->driver_name), driver->driver_name);
1094
1095         instance->usb_dev = usb_dev;
1096         instance->usb_intf = intf;
1097
1098         buf = instance->description;
1099         length = sizeof(instance->description);
1100
1101         if ((i = usb_string(usb_dev, usb_dev->descriptor.iProduct, buf, length)) < 0)
1102                 goto bind;
1103
1104         buf += i;
1105         length -= i;
1106
1107         i = scnprintf(buf, length, " (");
1108         buf += i;
1109         length -= i;
1110
1111         if (length <= 0 || (i = usb_make_path(usb_dev, buf, length)) < 0)
1112                 goto bind;
1113
1114         buf += i;
1115         length -= i;
1116
1117         snprintf(buf, length, ")");
1118
1119  bind:
1120         if (driver->bind && (error = driver->bind(instance, intf, id)) < 0) {
1121                         dev_err(dev, "%s: bind failed: %d!\n", __func__, error);
1122                         goto fail_free;
1123         }
1124
1125         /* private fields */
1126
1127         kref_init(&instance->refcount);         /* dropped in usbatm_usb_disconnect */
1128         mutex_init(&instance->serialize);
1129
1130         instance->thread = NULL;
1131         init_completion(&instance->thread_started);
1132         init_completion(&instance->thread_exited);
1133
1134         INIT_LIST_HEAD(&instance->vcc_list);
1135         skb_queue_head_init(&instance->sndqueue);
1136
1137         usbatm_init_channel(&instance->rx_channel);
1138         usbatm_init_channel(&instance->tx_channel);
1139         tasklet_init(&instance->rx_channel.tasklet, usbatm_rx_process, (unsigned long)instance);
1140         tasklet_init(&instance->tx_channel.tasklet, usbatm_tx_process, (unsigned long)instance);
1141         instance->rx_channel.stride = ATM_CELL_SIZE + driver->rx_padding;
1142         instance->tx_channel.stride = ATM_CELL_SIZE + driver->tx_padding;
1143         instance->rx_channel.usbatm = instance->tx_channel.usbatm = instance;
1144
1145         if ((instance->flags & UDSL_USE_ISOC) && driver->isoc_in)
1146                 instance->rx_channel.endpoint = usb_rcvisocpipe(usb_dev, driver->isoc_in);
1147         else
1148                 instance->rx_channel.endpoint = usb_rcvbulkpipe(usb_dev, driver->bulk_in);
1149
1150         instance->tx_channel.endpoint = usb_sndbulkpipe(usb_dev, driver->bulk_out);
1151
1152         /* tx buffer size must be a positive multiple of the stride */
1153         instance->tx_channel.buf_size = max (instance->tx_channel.stride,
1154                         snd_buf_bytes - (snd_buf_bytes % instance->tx_channel.stride));
1155
1156         /* rx buffer size must be a positive multiple of the endpoint maxpacket */
1157         maxpacket = usb_maxpacket(usb_dev, instance->rx_channel.endpoint, 0);
1158
1159         if ((maxpacket < 1) || (maxpacket > UDSL_MAX_BUF_SIZE)) {
1160                 dev_err(dev, "%s: invalid endpoint %02x!\n", __func__,
1161                                 usb_pipeendpoint(instance->rx_channel.endpoint));
1162                 error = -EINVAL;
1163                 goto fail_unbind;
1164         }
1165
1166         num_packets = max (1U, (rcv_buf_bytes + maxpacket / 2) / maxpacket); /* round */
1167
1168         if (num_packets * maxpacket > UDSL_MAX_BUF_SIZE)
1169                 num_packets--;
1170
1171         instance->rx_channel.buf_size = num_packets * maxpacket;
1172         instance->rx_channel.packet_size = maxpacket;
1173
1174 #ifdef DEBUG
1175         for (i = 0; i < 2; i++) {
1176                 struct usbatm_channel *channel = i ?
1177                         &instance->tx_channel : &instance->rx_channel;
1178
1179                 dev_dbg(dev, "%s: using %d byte buffer for %s channel 0x%p\n", __func__, channel->buf_size, i ? "tx" : "rx", channel);
1180         }
1181 #endif
1182
1183         /* initialize urbs */
1184
1185         for (i = 0; i < num_rcv_urbs + num_snd_urbs; i++) {
1186                 u8 *buffer;
1187                 struct usbatm_channel *channel = i < num_rcv_urbs ?
1188                         &instance->rx_channel : &instance->tx_channel;
1189                 struct urb *urb;
1190                 unsigned int iso_packets = usb_pipeisoc(channel->endpoint) ? channel->buf_size / channel->packet_size : 0;
1191
1192                 UDSL_ASSERT(!usb_pipeisoc(channel->endpoint) || usb_pipein(channel->endpoint));
1193
1194                 urb = usb_alloc_urb(iso_packets, GFP_KERNEL);
1195                 if (!urb) {
1196                         dev_err(dev, "%s: no memory for urb %d!\n", __func__, i);
1197                         error = -ENOMEM;
1198                         goto fail_unbind;
1199                 }
1200
1201                 instance->urbs[i] = urb;
1202
1203                 /* zero the tx padding to avoid leaking information */
1204                 buffer = kzalloc(channel->buf_size, GFP_KERNEL);
1205                 if (!buffer) {
1206                         dev_err(dev, "%s: no memory for buffer %d!\n", __func__, i);
1207                         error = -ENOMEM;
1208                         goto fail_unbind;
1209                 }
1210
1211                 usb_fill_bulk_urb(urb, instance->usb_dev, channel->endpoint,
1212                                   buffer, channel->buf_size, usbatm_complete, channel);
1213                 if (iso_packets) {
1214                         int j;
1215                         urb->interval = 1;
1216                         urb->transfer_flags = URB_ISO_ASAP;
1217                         urb->number_of_packets = iso_packets;
1218                         for (j = 0; j < iso_packets; j++) {
1219                                 urb->iso_frame_desc[j].offset = channel->packet_size * j;
1220                                 urb->iso_frame_desc[j].length = channel->packet_size;
1221                         }
1222                 }
1223
1224                 /* put all tx URBs on the list of spares */
1225                 if (i >= num_rcv_urbs)
1226                         list_add_tail(&urb->urb_list, &channel->list);
1227
1228                 vdbg("%s: alloced buffer 0x%p buf size %u urb 0x%p",
1229                      __func__, urb->transfer_buffer, urb->transfer_buffer_length, urb);
1230         }
1231
1232         instance->cached_vpi = ATM_VPI_UNSPEC;
1233         instance->cached_vci = ATM_VCI_UNSPEC;
1234         instance->cell_buf = kmalloc(instance->rx_channel.stride, GFP_KERNEL);
1235
1236         if (!instance->cell_buf) {
1237                 dev_err(dev, "%s: no memory for cell buffer!\n", __func__);
1238                 error = -ENOMEM;
1239                 goto fail_unbind;
1240         }
1241
1242         if (!(instance->flags & UDSL_SKIP_HEAVY_INIT) && driver->heavy_init) {
1243                 error = usbatm_heavy_init(instance);
1244         } else {
1245                 complete(&instance->thread_exited);     /* pretend that heavy_init was run */
1246                 error = usbatm_atm_init(instance);
1247         }
1248
1249         if (error < 0)
1250                 goto fail_unbind;
1251
1252         usb_get_dev(usb_dev);
1253         usb_set_intfdata(intf, instance);
1254
1255         return 0;
1256
1257  fail_unbind:
1258         if (instance->driver->unbind)
1259                 instance->driver->unbind(instance, intf);
1260  fail_free:
1261         kfree(instance->cell_buf);
1262
1263         for (i = 0; i < num_rcv_urbs + num_snd_urbs; i++) {
1264                 if (instance->urbs[i])
1265                         kfree(instance->urbs[i]->transfer_buffer);
1266                 usb_free_urb(instance->urbs[i]);
1267         }
1268
1269         kfree (instance);
1270
1271         return error;
1272 }
1273 EXPORT_SYMBOL_GPL(usbatm_usb_probe);
1274
1275 void usbatm_usb_disconnect(struct usb_interface *intf)
1276 {
1277         struct device *dev = &intf->dev;
1278         struct usbatm_data *instance = usb_get_intfdata(intf);
1279         struct usbatm_vcc_data *vcc_data;
1280         int i;
1281
1282         dev_dbg(dev, "%s entered\n", __func__);
1283
1284         if (!instance) {
1285                 dev_dbg(dev, "%s: NULL instance!\n", __func__);
1286                 return;
1287         }
1288
1289         usb_set_intfdata(intf, NULL);
1290
1291         mutex_lock(&instance->serialize);
1292         instance->disconnected = 1;
1293         if (instance->thread != NULL)
1294                 send_sig(SIGTERM, instance->thread, 1);
1295         mutex_unlock(&instance->serialize);
1296
1297         wait_for_completion(&instance->thread_exited);
1298
1299         mutex_lock(&instance->serialize);
1300         list_for_each_entry(vcc_data, &instance->vcc_list, list)
1301                 vcc_release_async(vcc_data->vcc, -EPIPE);
1302         mutex_unlock(&instance->serialize);
1303
1304         tasklet_disable(&instance->rx_channel.tasklet);
1305         tasklet_disable(&instance->tx_channel.tasklet);
1306
1307         for (i = 0; i < num_rcv_urbs + num_snd_urbs; i++)
1308                 usb_kill_urb(instance->urbs[i]);
1309
1310         del_timer_sync(&instance->rx_channel.delay);
1311         del_timer_sync(&instance->tx_channel.delay);
1312
1313         /* turn usbatm_[rt]x_process into something close to a no-op */
1314         /* no need to take the spinlock */
1315         INIT_LIST_HEAD(&instance->rx_channel.list);
1316         INIT_LIST_HEAD(&instance->tx_channel.list);
1317
1318         tasklet_enable(&instance->rx_channel.tasklet);
1319         tasklet_enable(&instance->tx_channel.tasklet);
1320
1321         if (instance->atm_dev && instance->driver->atm_stop)
1322                 instance->driver->atm_stop(instance, instance->atm_dev);
1323
1324         if (instance->driver->unbind)
1325                 instance->driver->unbind(instance, intf);
1326
1327         instance->driver_data = NULL;
1328
1329         for (i = 0; i < num_rcv_urbs + num_snd_urbs; i++) {
1330                 kfree(instance->urbs[i]->transfer_buffer);
1331                 usb_free_urb(instance->urbs[i]);
1332         }
1333
1334         kfree(instance->cell_buf);
1335
1336         /* ATM finalize */
1337         if (instance->atm_dev) {
1338                 sysfs_remove_link(&instance->atm_dev->class_dev.kobj, "device");
1339                 atm_dev_deregister(instance->atm_dev);
1340         }
1341
1342         usbatm_put_instance(instance);  /* taken in usbatm_usb_probe */
1343 }
1344 EXPORT_SYMBOL_GPL(usbatm_usb_disconnect);
1345
1346
1347 /***********
1348 **  init  **
1349 ***********/
1350
1351 static int __init usbatm_usb_init(void)
1352 {
1353         dbg("%s: driver version %s", __func__, DRIVER_VERSION);
1354
1355         if (sizeof(struct usbatm_control) > sizeof(((struct sk_buff *) 0)->cb)) {
1356                 printk(KERN_ERR "%s unusable with this kernel!\n", usbatm_driver_name);
1357                 return -EIO;
1358         }
1359
1360         if ((num_rcv_urbs > UDSL_MAX_RCV_URBS)
1361             || (num_snd_urbs > UDSL_MAX_SND_URBS)
1362             || (rcv_buf_bytes < 1)
1363             || (rcv_buf_bytes > UDSL_MAX_BUF_SIZE)
1364             || (snd_buf_bytes < 1)
1365             || (snd_buf_bytes > UDSL_MAX_BUF_SIZE))
1366                 return -EINVAL;
1367
1368         return 0;
1369 }
1370 module_init(usbatm_usb_init);
1371
1372 static void __exit usbatm_usb_exit(void)
1373 {
1374         dbg("%s", __func__);
1375 }
1376 module_exit(usbatm_usb_exit);
1377
1378 MODULE_AUTHOR(DRIVER_AUTHOR);
1379 MODULE_DESCRIPTION(DRIVER_DESC);
1380 MODULE_LICENSE("GPL");
1381 MODULE_VERSION(DRIVER_VERSION);
1382
1383 /************
1384 **  debug  **
1385 ************/
1386
1387 #ifdef VERBOSE_DEBUG
1388 static int usbatm_print_packet(const unsigned char *data, int len)
1389 {
1390         unsigned char buffer[256];
1391         int i = 0, j = 0;
1392
1393         for (i = 0; i < len;) {
1394                 buffer[0] = '\0';
1395                 sprintf(buffer, "%.3d :", i);
1396                 for (j = 0; (j < 16) && (i < len); j++, i++) {
1397                         sprintf(buffer, "%s %2.2x", buffer, data[i]);
1398                 }
1399                 dbg("%s", buffer);
1400         }
1401         return i;
1402 }
1403 #endif