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