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 86static 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 98static 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 112static unsigned int num_rcv_urbs = UDSL_DEFAULT_RCV_URBS; 113static unsigned int num_snd_urbs = UDSL_DEFAULT_SND_URBS; 114static unsigned int rcv_buf_bytes = UDSL_DEFAULT_RCV_BUF_SIZE; 115static unsigned int snd_buf_bytes = UDSL_DEFAULT_SND_BUF_SIZE; 116 117module_param(num_rcv_urbs, uint, S_IRUGO); 118MODULE_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 123module_param(num_snd_urbs, uint, S_IRUGO); 124MODULE_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 129module_param(rcv_buf_bytes, uint, S_IRUGO); 130MODULE_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 135module_param(snd_buf_bytes, uint, S_IRUGO); 136MODULE_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 144struct 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 158struct 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 169static void usbatm_atm_dev_close(struct atm_dev *atm_dev); 170static int usbatm_atm_open(struct atm_vcc *vcc); 171static void usbatm_atm_close(struct atm_vcc *vcc); 172static int usbatm_atm_ioctl(struct atm_dev *atm_dev, unsigned int cmd, void __user * arg); 173static int usbatm_atm_send(struct atm_vcc *vcc, struct sk_buff *skb); 174static int usbatm_atm_proc_read(struct atm_dev *atm_dev, loff_t * pos, char *page); 175 176static 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 191static 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 197static 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 210static 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 227static 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 257static 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 if (status == -ESHUTDOWN) 278 return; 279 280 if (printk_ratelimit()) 281 atm_warn(channel->usbatm, "%s: urb 0x%p failed (%d)!\n", 282 __func__, 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 294static 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 305static 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(instance, 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 420static 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(instance, 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 467static 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(instance, !(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 } else 519 ctrl->crc = crc32_be(ctrl->crc, ptr, left); 520 } 521 522 return bytes_written; 523} 524 525 526/************** 527** receive ** 528**************/ 529 530static void usbatm_rx_process(unsigned long data) 531{ 532 struct usbatm_data *instance = (struct usbatm_data *)data; 533 struct urb *urb; 534 535 while ((urb = usbatm_pop_urb(&instance->rx_channel))) { 536 vdbg("%s: processing urb 0x%p", __func__, urb); 537 538 if (usb_pipeisoc(urb->pipe)) { 539 unsigned char *merge_start = NULL; 540 unsigned int merge_length = 0; 541 const unsigned int packet_size = instance->rx_channel.packet_size; 542 int i; 543 544 for (i = 0; i < urb->number_of_packets; i++) { 545 if (!urb->iso_frame_desc[i].status) { 546 unsigned int actual_length = urb->iso_frame_desc[i].actual_length; 547 548 UDSL_ASSERT(instance, actual_length <= packet_size); 549 550 if (!merge_length) 551 merge_start = (unsigned char *)urb->transfer_buffer + urb->iso_frame_desc[i].offset; 552 merge_length += actual_length; 553 if (merge_length && (actual_length < packet_size)) { 554 usbatm_extract_cells(instance, merge_start, merge_length); 555 merge_length = 0; 556 } 557 } else { 558 atm_rldbg(instance, "%s: status %d in frame %d!\n", __func__, urb->status, i); 559 if (merge_length) 560 usbatm_extract_cells(instance, merge_start, merge_length); 561 merge_length = 0; 562 instance->buf_usage = 0; 563 } 564 } 565 566 if (merge_length) 567 usbatm_extract_cells(instance, merge_start, merge_length); 568 } else 569 if (!urb->status) 570 usbatm_extract_cells(instance, urb->transfer_buffer, urb->actual_length); 571 else 572 instance->buf_usage = 0; 573 574 if (usbatm_submit_urb(urb)) 575 return; 576 } 577} 578 579 580/*********** 581** send ** 582***********/ 583 584static void usbatm_tx_process(unsigned long data) 585{ 586 struct usbatm_data *instance = (struct usbatm_data *)data; 587 struct sk_buff *skb = instance->current_skb; 588 struct urb *urb = NULL; 589 const unsigned int buf_size = instance->tx_channel.buf_size; 590 unsigned int bytes_written = 0; 591 u8 *buffer = NULL; 592 593 if (!skb) 594 skb = skb_dequeue(&instance->sndqueue); 595 596 while (skb) { 597 if (!urb) { 598 urb = usbatm_pop_urb(&instance->tx_channel); 599 if (!urb) 600 break; /* no more senders */ 601 buffer = urb->transfer_buffer; 602 bytes_written = (urb->status == -EAGAIN) ? 603 urb->transfer_buffer_length : 0; 604 } 605 606 bytes_written += usbatm_write_cells(instance, skb, 607 buffer + bytes_written, 608 buf_size - bytes_written); 609 610 vdbg("%s: wrote %u bytes from skb 0x%p to urb 0x%p", 611 __func__, bytes_written, skb, urb); 612 613 if (!UDSL_SKB(skb)->len) { 614 struct atm_vcc *vcc = UDSL_SKB(skb)->atm.vcc; 615 616 usbatm_pop(vcc, skb); 617 atomic_inc(&vcc->stats->tx); 618 619 skb = skb_dequeue(&instance->sndqueue); 620 } 621 622 if (bytes_written == buf_size || (!skb && bytes_written)) { 623 urb->transfer_buffer_length = bytes_written; 624 625 if (usbatm_submit_urb(urb)) 626 break; 627 urb = NULL; 628 } 629 } 630 631 instance->current_skb = skb; 632} 633 634static void usbatm_cancel_send(struct usbatm_data *instance, 635 struct atm_vcc *vcc) 636{ 637 struct sk_buff *skb, *n; 638 639 atm_dbg(instance, "%s entered\n", __func__); 640 spin_lock_irq(&instance->sndqueue.lock); 641 skb_queue_walk_safe(&instance->sndqueue, skb, n) { 642 if (UDSL_SKB(skb)->atm.vcc == vcc) { 643 atm_dbg(instance, "%s: popping skb 0x%p\n", __func__, skb); 644 __skb_unlink(skb, &instance->sndqueue); 645 usbatm_pop(vcc, skb); 646 } 647 } 648 spin_unlock_irq(&instance->sndqueue.lock); 649 650 tasklet_disable(&instance->tx_channel.tasklet); 651 if ((skb = instance->current_skb) && (UDSL_SKB(skb)->atm.vcc == vcc)) { 652 atm_dbg(instance, "%s: popping current skb (0x%p)\n", __func__, skb); 653 instance->current_skb = NULL; 654 usbatm_pop(vcc, skb); 655 } 656 tasklet_enable(&instance->tx_channel.tasklet); 657 atm_dbg(instance, "%s done\n", __func__); 658} 659 660static int usbatm_atm_send(struct atm_vcc *vcc, struct sk_buff *skb) 661{ 662 struct usbatm_data *instance = vcc->dev->dev_data; 663 struct usbatm_control *ctrl = UDSL_SKB(skb); 664 int err; 665 666 vdbg("%s called (skb 0x%p, len %u)", __func__, skb, skb->len); 667 668 /* racy disconnection check - fine */ 669 if (!instance || instance->disconnected) { 670#ifdef DEBUG 671 if (printk_ratelimit()) 672 printk(KERN_DEBUG "%s: %s!\n", __func__, instance ? "disconnected" : "NULL instance"); 673#endif 674 err = -ENODEV; 675 goto fail; 676 } 677 678 if (vcc->qos.aal != ATM_AAL5) { 679 atm_rldbg(instance, "%s: unsupported ATM type %d!\n", __func__, vcc->qos.aal); 680 err = -EINVAL; 681 goto fail; 682 } 683 684 if (skb->len > ATM_MAX_AAL5_PDU) { 685 atm_rldbg(instance, "%s: packet too long (%d vs %d)!\n", 686 __func__, skb->len, ATM_MAX_AAL5_PDU); 687 err = -EINVAL; 688 goto fail; 689 } 690 691 PACKETDEBUG(skb->data, skb->len); 692 693 /* initialize the control block */ 694 ctrl->atm.vcc = vcc; 695 ctrl->len = skb->len; 696 ctrl->crc = crc32_be(~0, skb->data, skb->len); 697 698 skb_queue_tail(&instance->sndqueue, skb); 699 tasklet_schedule(&instance->tx_channel.tasklet); 700 701 return 0; 702 703 fail: 704 usbatm_pop(vcc, skb); 705 return err; 706} 707 708 709/******************** 710** bean counting ** 711********************/ 712 713static void usbatm_destroy_instance(struct kref *kref) 714{ 715 struct usbatm_data *instance = container_of(kref, struct usbatm_data, refcount); 716 717 dbg("%s", __func__); 718 719 tasklet_kill(&instance->rx_channel.tasklet); 720 tasklet_kill(&instance->tx_channel.tasklet); 721 usb_put_dev(instance->usb_dev); 722 kfree(instance); 723} 724 725static void usbatm_get_instance(struct usbatm_data *instance) 726{ 727 dbg("%s", __func__); 728 729 kref_get(&instance->refcount); 730} 731 732static void usbatm_put_instance(struct usbatm_data *instance) 733{ 734 dbg("%s", __func__); 735 736 kref_put(&instance->refcount, usbatm_destroy_instance); 737} 738 739 740/********** 741** ATM ** 742**********/ 743 744static void usbatm_atm_dev_close(struct atm_dev *atm_dev) 745{ 746 struct usbatm_data *instance = atm_dev->dev_data; 747 748 dbg("%s", __func__); 749 750 if (!instance) 751 return; 752 753 atm_dev->dev_data = NULL; /* catch bugs */ 754 usbatm_put_instance(instance); /* taken in usbatm_atm_init */ 755} 756 757static int usbatm_atm_proc_read(struct atm_dev *atm_dev, loff_t * pos, char *page) 758{ 759 struct usbatm_data *instance = atm_dev->dev_data; 760 int left = *pos; 761 762 if (!instance) { 763 dbg("%s: NULL instance!", __func__); 764 return -ENODEV; 765 } 766 767 if (!left--) 768 return sprintf(page, "%s\n", instance->description); 769 770 if (!left--) 771 return sprintf(page, "MAC: %pM\n", atm_dev->esi); 772 773 if (!left--) 774 return sprintf(page, 775 "AAL5: tx %d ( %d err ), rx %d ( %d err, %d drop )\n", 776 atomic_read(&atm_dev->stats.aal5.tx), 777 atomic_read(&atm_dev->stats.aal5.tx_err), 778 atomic_read(&atm_dev->stats.aal5.rx), 779 atomic_read(&atm_dev->stats.aal5.rx_err), 780 atomic_read(&atm_dev->stats.aal5.rx_drop)); 781 782 if (!left--) { 783 if (instance->disconnected) 784 return sprintf(page, "Disconnected\n"); 785 else 786 switch (atm_dev->signal) { 787 case ATM_PHY_SIG_FOUND: 788 return sprintf(page, "Line up\n"); 789 case ATM_PHY_SIG_LOST: 790 return sprintf(page, "Line down\n"); 791 default: 792 return sprintf(page, "Line state unknown\n"); 793 } 794 } 795 796 return 0; 797} 798 799static int usbatm_atm_open(struct atm_vcc *vcc) 800{ 801 struct usbatm_data *instance = vcc->dev->dev_data; 802 struct usbatm_vcc_data *new = NULL; 803 int ret; 804 int vci = vcc->vci; 805 short vpi = vcc->vpi; 806 807 if (!instance) { 808 dbg("%s: NULL data!", __func__); 809 return -ENODEV; 810 } 811 812 atm_dbg(instance, "%s: vpi %hd, vci %d\n", __func__, vpi, vci); 813 814 /* only support AAL5 */ 815 if ((vcc->qos.aal != ATM_AAL5)) { 816 atm_warn(instance, "%s: unsupported ATM type %d!\n", __func__, vcc->qos.aal); 817 return -EINVAL; 818 } 819 820 /* sanity checks */ 821 if ((vcc->qos.rxtp.max_sdu < 0) || (vcc->qos.rxtp.max_sdu > ATM_MAX_AAL5_PDU)) { 822 atm_dbg(instance, "%s: max_sdu %d out of range!\n", __func__, vcc->qos.rxtp.max_sdu); 823 return -EINVAL; 824 } 825 826 mutex_lock(&instance->serialize); /* vs self, usbatm_atm_close, usbatm_usb_disconnect */ 827 828 if (instance->disconnected) { 829 atm_dbg(instance, "%s: disconnected!\n", __func__); 830 ret = -ENODEV; 831 goto fail; 832 } 833 834 if (usbatm_find_vcc(instance, vpi, vci)) { 835 atm_dbg(instance, "%s: %hd/%d already in use!\n", __func__, vpi, vci); 836 ret = -EADDRINUSE; 837 goto fail; 838 } 839 840 if (!(new = kzalloc(sizeof(struct usbatm_vcc_data), GFP_KERNEL))) { 841 atm_err(instance, "%s: no memory for vcc_data!\n", __func__); 842 ret = -ENOMEM; 843 goto fail; 844 } 845 846 new->vcc = vcc; 847 new->vpi = vpi; 848 new->vci = vci; 849 850 new->sarb = alloc_skb(usbatm_pdu_length(vcc->qos.rxtp.max_sdu), GFP_KERNEL); 851 if (!new->sarb) { 852 atm_err(instance, "%s: no memory for SAR buffer!\n", __func__); 853 ret = -ENOMEM; 854 goto fail; 855 } 856 857 vcc->dev_data = new; 858 859 tasklet_disable(&instance->rx_channel.tasklet); 860 instance->cached_vcc = new; 861 instance->cached_vpi = vpi; 862 instance->cached_vci = vci; 863 list_add(&new->list, &instance->vcc_list); 864 tasklet_enable(&instance->rx_channel.tasklet); 865 866 set_bit(ATM_VF_ADDR, &vcc->flags); 867 set_bit(ATM_VF_PARTIAL, &vcc->flags); 868 set_bit(ATM_VF_READY, &vcc->flags); 869 870 mutex_unlock(&instance->serialize); 871 872 atm_dbg(instance, "%s: allocated vcc data 0x%p\n", __func__, new); 873 874 return 0; 875 876fail: 877 kfree(new); 878 mutex_unlock(&instance->serialize); 879 return ret; 880} 881 882static void usbatm_atm_close(struct atm_vcc *vcc) 883{ 884 struct usbatm_data *instance = vcc->dev->dev_data; 885 struct usbatm_vcc_data *vcc_data = vcc->dev_data; 886 887 if (!instance || !vcc_data) { 888 dbg("%s: NULL data!", __func__); 889 return; 890 } 891 892 atm_dbg(instance, "%s entered\n", __func__); 893 894 atm_dbg(instance, "%s: deallocating vcc 0x%p with vpi %d vci %d\n", 895 __func__, vcc_data, vcc_data->vpi, vcc_data->vci); 896 897 usbatm_cancel_send(instance, vcc); 898 899 mutex_lock(&instance->serialize); /* vs self, usbatm_atm_open, usbatm_usb_disconnect */ 900 901 tasklet_disable(&instance->rx_channel.tasklet); 902 if (instance->cached_vcc == vcc_data) { 903 instance->cached_vcc = NULL; 904 instance->cached_vpi = ATM_VPI_UNSPEC; 905 instance->cached_vci = ATM_VCI_UNSPEC; 906 } 907 list_del(&vcc_data->list); 908 tasklet_enable(&instance->rx_channel.tasklet); 909 910 kfree_skb(vcc_data->sarb); 911 vcc_data->sarb = NULL; 912 913 kfree(vcc_data); 914 vcc->dev_data = NULL; 915 916 vcc->vpi = ATM_VPI_UNSPEC; 917 vcc->vci = ATM_VCI_UNSPEC; 918 clear_bit(ATM_VF_READY, &vcc->flags); 919 clear_bit(ATM_VF_PARTIAL, &vcc->flags); 920 clear_bit(ATM_VF_ADDR, &vcc->flags); 921 922 mutex_unlock(&instance->serialize); 923 924 atm_dbg(instance, "%s successful\n", __func__); 925} 926 927static int usbatm_atm_ioctl(struct atm_dev *atm_dev, unsigned int cmd, 928 void __user * arg) 929{ 930 struct usbatm_data *instance = atm_dev->dev_data; 931 932 if (!instance || instance->disconnected) { 933 dbg("%s: %s!", __func__, instance ? "disconnected" : "NULL instance"); 934 return -ENODEV; 935 } 936 937 switch (cmd) { 938 case ATM_QUERYLOOP: 939 return put_user(ATM_LM_NONE, (int __user *)arg) ? -EFAULT : 0; 940 default: 941 return -ENOIOCTLCMD; 942 } 943} 944 945static int usbatm_atm_init(struct usbatm_data *instance) 946{ 947 struct atm_dev *atm_dev; 948 int ret, i; 949 950 /* ATM init. The ATM initialization scheme suffers from an intrinsic race 951 * condition: callbacks we register can be executed at once, before we have 952 * initialized the struct atm_dev. To protect against this, all callbacks 953 * abort if atm_dev->dev_data is NULL. */ 954 atm_dev = atm_dev_register(instance->driver_name, &usbatm_atm_devops, -1, NULL); 955 if (!atm_dev) { 956 usb_err(instance, "%s: failed to register ATM device!\n", __func__); 957 return -1; 958 } 959 960 instance->atm_dev = atm_dev; 961 962 atm_dev->ci_range.vpi_bits = ATM_CI_MAX; 963 atm_dev->ci_range.vci_bits = ATM_CI_MAX; 964 atm_dev->signal = ATM_PHY_SIG_UNKNOWN; 965 966 /* temp init ATM device, set to 128kbit */ 967 atm_dev->link_rate = 128 * 1000 / 424; 968 969 ret = sysfs_create_link(&atm_dev->class_dev.kobj, 970 &instance->usb_intf->dev.kobj, "device"); 971 if (ret) { 972 atm_err(instance, "%s: sysfs_create_link failed: %d\n", 973 __func__, ret); 974 goto fail_sysfs; 975 } 976 977 if (instance->driver->atm_start && ((ret = instance->driver->atm_start(instance, atm_dev)) < 0)) { 978 atm_err(instance, "%s: atm_start failed: %d!\n", __func__, ret); 979 goto fail; 980 } 981 982 usbatm_get_instance(instance); /* dropped in usbatm_atm_dev_close */ 983 984 /* ready for ATM callbacks */ 985 mb(); 986 atm_dev->dev_data = instance; 987 988 /* submit all rx URBs */ 989 for (i = 0; i < num_rcv_urbs; i++) 990 usbatm_submit_urb(instance->urbs[i]); 991 992 return 0; 993 994 fail: 995 sysfs_remove_link(&atm_dev->class_dev.kobj, "device"); 996 fail_sysfs: 997 instance->atm_dev = NULL; 998 atm_dev_deregister(atm_dev); /* usbatm_atm_dev_close will eventually be called */ 999 return ret; 1000} 1001 1002 1003/********** 1004** USB ** 1005**********/ 1006 1007static int usbatm_do_heavy_init(void *arg) 1008{ 1009 struct usbatm_data *instance = arg; 1010 int ret; 1011 1012 allow_signal(SIGTERM); 1013 complete(&instance->thread_started); 1014 1015 ret = instance->driver->heavy_init(instance, instance->usb_intf); 1016 1017 if (!ret) 1018 ret = usbatm_atm_init(instance); 1019 1020 mutex_lock(&instance->serialize); 1021 instance->thread = NULL; 1022 mutex_unlock(&instance->serialize); 1023 1024 complete_and_exit(&instance->thread_exited, ret); 1025} 1026 1027static int usbatm_heavy_init(struct usbatm_data *instance) 1028{ 1029 struct task_struct *t; 1030 1031 t = kthread_create(usbatm_do_heavy_init, instance, 1032 instance->driver->driver_name); 1033 if (IS_ERR(t)) { 1034 usb_err(instance, "%s: failed to create kernel_thread (%ld)!\n", 1035 __func__, PTR_ERR(t)); 1036 return PTR_ERR(t); 1037 } 1038 1039 instance->thread = t; 1040 wake_up_process(t); 1041 wait_for_completion(&instance->thread_started); 1042 1043 return 0; 1044} 1045 1046static void usbatm_tasklet_schedule(unsigned long data) 1047{ 1048 tasklet_schedule((struct tasklet_struct *) data); 1049} 1050 1051static void usbatm_init_channel(struct usbatm_channel *channel) 1052{ 1053 spin_lock_init(&channel->lock); 1054 INIT_LIST_HEAD(&channel->list); 1055 channel->delay.function = usbatm_tasklet_schedule; 1056 channel->delay.data = (unsigned long) &channel->tasklet; 1057 init_timer(&channel->delay); 1058} 1059 1060int usbatm_usb_probe(struct usb_interface *intf, const struct usb_device_id *id, 1061 struct usbatm_driver *driver) 1062{ 1063 struct device *dev = &intf->dev; 1064 struct usb_device *usb_dev = interface_to_usbdev(intf); 1065 struct usbatm_data *instance; 1066 char *buf; 1067 int error = -ENOMEM; 1068 int i, length; 1069 unsigned int maxpacket, num_packets; 1070 1071 dev_dbg(dev, "%s: trying driver %s with vendor=%04x, product=%04x, ifnum %2d\n", 1072 __func__, driver->driver_name, 1073 le16_to_cpu(usb_dev->descriptor.idVendor), 1074 le16_to_cpu(usb_dev->descriptor.idProduct), 1075 intf->altsetting->desc.bInterfaceNumber); 1076 1077 /* instance init */ 1078 instance = kzalloc(sizeof(*instance) + sizeof(struct urb *) * (num_rcv_urbs + num_snd_urbs), GFP_KERNEL); 1079 if (!instance) { 1080 dev_err(dev, "%s: no memory for instance data!\n", __func__); 1081 return -ENOMEM; 1082 } 1083 1084 /* public fields */ 1085 1086 instance->driver = driver; 1087 snprintf(instance->driver_name, sizeof(instance->driver_name), driver->driver_name); 1088 1089 instance->usb_dev = usb_dev; 1090 instance->usb_intf = intf; 1091 1092 buf = instance->description; 1093 length = sizeof(instance->description); 1094 1095 if ((i = usb_string(usb_dev, usb_dev->descriptor.iProduct, buf, length)) < 0) 1096 goto bind; 1097 1098 buf += i; 1099 length -= i; 1100 1101 i = scnprintf(buf, length, " ("); 1102 buf += i; 1103 length -= i; 1104 1105 if (length <= 0 || (i = usb_make_path(usb_dev, buf, length)) < 0) 1106 goto bind; 1107 1108 buf += i; 1109 length -= i; 1110 1111 snprintf(buf, length, ")"); 1112 1113 bind: 1114 if (driver->bind && (error = driver->bind(instance, intf, id)) < 0) { 1115 dev_err(dev, "%s: bind failed: %d!\n", __func__, error); 1116 goto fail_free; 1117 } 1118 1119 /* private fields */ 1120 1121 kref_init(&instance->refcount); /* dropped in usbatm_usb_disconnect */ 1122 mutex_init(&instance->serialize); 1123 1124 instance->thread = NULL; 1125 init_completion(&instance->thread_started); 1126 init_completion(&instance->thread_exited); 1127 1128 INIT_LIST_HEAD(&instance->vcc_list); 1129 skb_queue_head_init(&instance->sndqueue); 1130 1131 usbatm_init_channel(&instance->rx_channel); 1132 usbatm_init_channel(&instance->tx_channel); 1133 tasklet_init(&instance->rx_channel.tasklet, usbatm_rx_process, (unsigned long)instance); 1134 tasklet_init(&instance->tx_channel.tasklet, usbatm_tx_process, (unsigned long)instance); 1135 instance->rx_channel.stride = ATM_CELL_SIZE + driver->rx_padding; 1136 instance->tx_channel.stride = ATM_CELL_SIZE + driver->tx_padding; 1137 instance->rx_channel.usbatm = instance->tx_channel.usbatm = instance; 1138 1139 if ((instance->flags & UDSL_USE_ISOC) && driver->isoc_in) 1140 instance->rx_channel.endpoint = usb_rcvisocpipe(usb_dev, driver->isoc_in); 1141 else 1142 instance->rx_channel.endpoint = usb_rcvbulkpipe(usb_dev, driver->bulk_in); 1143 1144 instance->tx_channel.endpoint = usb_sndbulkpipe(usb_dev, driver->bulk_out); 1145 1146 /* tx buffer size must be a positive multiple of the stride */ 1147 instance->tx_channel.buf_size = max(instance->tx_channel.stride, 1148 snd_buf_bytes - (snd_buf_bytes % instance->tx_channel.stride)); 1149 1150 /* rx buffer size must be a positive multiple of the endpoint maxpacket */ 1151 maxpacket = usb_maxpacket(usb_dev, instance->rx_channel.endpoint, 0); 1152 1153 if ((maxpacket < 1) || (maxpacket > UDSL_MAX_BUF_SIZE)) { 1154 dev_err(dev, "%s: invalid endpoint %02x!\n", __func__, 1155 usb_pipeendpoint(instance->rx_channel.endpoint)); 1156 error = -EINVAL; 1157 goto fail_unbind; 1158 } 1159 1160 num_packets = max(1U, (rcv_buf_bytes + maxpacket / 2) / maxpacket); /* round */ 1161 1162 if (num_packets * maxpacket > UDSL_MAX_BUF_SIZE) 1163 num_packets--; 1164 1165 instance->rx_channel.buf_size = num_packets * maxpacket; 1166 instance->rx_channel.packet_size = maxpacket; 1167 1168#ifdef DEBUG 1169 for (i = 0; i < 2; i++) { 1170 struct usbatm_channel *channel = i ? 1171 &instance->tx_channel : &instance->rx_channel; 1172 1173 dev_dbg(dev, "%s: using %d byte buffer for %s channel 0x%p\n", __func__, channel->buf_size, i ? "tx" : "rx", channel); 1174 } 1175#endif 1176 1177 /* initialize urbs */ 1178 1179 for (i = 0; i < num_rcv_urbs + num_snd_urbs; i++) { 1180 u8 *buffer; 1181 struct usbatm_channel *channel = i < num_rcv_urbs ? 1182 &instance->rx_channel : &instance->tx_channel; 1183 struct urb *urb; 1184 unsigned int iso_packets = usb_pipeisoc(channel->endpoint) ? channel->buf_size / channel->packet_size : 0; 1185 1186 UDSL_ASSERT(instance, !usb_pipeisoc(channel->endpoint) || usb_pipein(channel->endpoint)); 1187 1188 urb = usb_alloc_urb(iso_packets, GFP_KERNEL); 1189 if (!urb) { 1190 dev_err(dev, "%s: no memory for urb %d!\n", __func__, i); 1191 error = -ENOMEM; 1192 goto fail_unbind; 1193 } 1194 1195 instance->urbs[i] = urb; 1196 1197 /* zero the tx padding to avoid leaking information */ 1198 buffer = kzalloc(channel->buf_size, GFP_KERNEL); 1199 if (!buffer) { 1200 dev_err(dev, "%s: no memory for buffer %d!\n", __func__, i); 1201 error = -ENOMEM; 1202 goto fail_unbind; 1203 } 1204 1205 usb_fill_bulk_urb(urb, instance->usb_dev, channel->endpoint, 1206 buffer, channel->buf_size, usbatm_complete, channel); 1207 if (iso_packets) { 1208 int j; 1209 urb->interval = 1; 1210 urb->transfer_flags = URB_ISO_ASAP; 1211 urb->number_of_packets = iso_packets; 1212 for (j = 0; j < iso_packets; j++) { 1213 urb->iso_frame_desc[j].offset = channel->packet_size * j; 1214 urb->iso_frame_desc[j].length = channel->packet_size; 1215 } 1216 } 1217 1218 /* put all tx URBs on the list of spares */ 1219 if (i >= num_rcv_urbs) 1220 list_add_tail(&urb->urb_list, &channel->list); 1221 1222 vdbg("%s: alloced buffer 0x%p buf size %u urb 0x%p", 1223 __func__, urb->transfer_buffer, urb->transfer_buffer_length, urb); 1224 } 1225 1226 instance->cached_vpi = ATM_VPI_UNSPEC; 1227 instance->cached_vci = ATM_VCI_UNSPEC; 1228 instance->cell_buf = kmalloc(instance->rx_channel.stride, GFP_KERNEL); 1229 1230 if (!instance->cell_buf) { 1231 dev_err(dev, "%s: no memory for cell buffer!\n", __func__); 1232 error = -ENOMEM; 1233 goto fail_unbind; 1234 } 1235 1236 if (!(instance->flags & UDSL_SKIP_HEAVY_INIT) && driver->heavy_init) { 1237 error = usbatm_heavy_init(instance); 1238 } else { 1239 complete(&instance->thread_exited); /* pretend that heavy_init was run */ 1240 error = usbatm_atm_init(instance); 1241 } 1242 1243 if (error < 0) 1244 goto fail_unbind; 1245 1246 usb_get_dev(usb_dev); 1247 usb_set_intfdata(intf, instance); 1248 1249 return 0; 1250 1251 fail_unbind: 1252 if (instance->driver->unbind) 1253 instance->driver->unbind(instance, intf); 1254 fail_free: 1255 kfree(instance->cell_buf); 1256 1257 for (i = 0; i < num_rcv_urbs + num_snd_urbs; i++) { 1258 if (instance->urbs[i]) 1259 kfree(instance->urbs[i]->transfer_buffer); 1260 usb_free_urb(instance->urbs[i]); 1261 } 1262 1263 kfree(instance); 1264 1265 return error; 1266} 1267EXPORT_SYMBOL_GPL(usbatm_usb_probe); 1268 1269void usbatm_usb_disconnect(struct usb_interface *intf) 1270{ 1271 struct device *dev = &intf->dev; 1272 struct usbatm_data *instance = usb_get_intfdata(intf); 1273 struct usbatm_vcc_data *vcc_data; 1274 int i; 1275 1276 dev_dbg(dev, "%s entered\n", __func__); 1277 1278 if (!instance) { 1279 dev_dbg(dev, "%s: NULL instance!\n", __func__); 1280 return; 1281 } 1282 1283 usb_set_intfdata(intf, NULL); 1284 1285 mutex_lock(&instance->serialize); 1286 instance->disconnected = 1; 1287 if (instance->thread != NULL) 1288 send_sig(SIGTERM, instance->thread, 1); 1289 mutex_unlock(&instance->serialize); 1290 1291 wait_for_completion(&instance->thread_exited); 1292 1293 mutex_lock(&instance->serialize); 1294 list_for_each_entry(vcc_data, &instance->vcc_list, list) 1295 vcc_release_async(vcc_data->vcc, -EPIPE); 1296 mutex_unlock(&instance->serialize); 1297 1298 tasklet_disable(&instance->rx_channel.tasklet); 1299 tasklet_disable(&instance->tx_channel.tasklet); 1300 1301 for (i = 0; i < num_rcv_urbs + num_snd_urbs; i++) 1302 usb_kill_urb(instance->urbs[i]); 1303 1304 del_timer_sync(&instance->rx_channel.delay); 1305 del_timer_sync(&instance->tx_channel.delay); 1306 1307 /* turn usbatm_[rt]x_process into something close to a no-op */ 1308 /* no need to take the spinlock */ 1309 INIT_LIST_HEAD(&instance->rx_channel.list); 1310 INIT_LIST_HEAD(&instance->tx_channel.list); 1311 1312 tasklet_enable(&instance->rx_channel.tasklet); 1313 tasklet_enable(&instance->tx_channel.tasklet); 1314 1315 if (instance->atm_dev && instance->driver->atm_stop) 1316 instance->driver->atm_stop(instance, instance->atm_dev); 1317 1318 if (instance->driver->unbind) 1319 instance->driver->unbind(instance, intf); 1320 1321 instance->driver_data = NULL; 1322 1323 for (i = 0; i < num_rcv_urbs + num_snd_urbs; i++) { 1324 kfree(instance->urbs[i]->transfer_buffer); 1325 usb_free_urb(instance->urbs[i]); 1326 } 1327 1328 kfree(instance->cell_buf); 1329 1330 /* ATM finalize */ 1331 if (instance->atm_dev) { 1332 sysfs_remove_link(&instance->atm_dev->class_dev.kobj, "device"); 1333 atm_dev_deregister(instance->atm_dev); 1334 instance->atm_dev = NULL; 1335 } 1336 1337 usbatm_put_instance(instance); /* taken in usbatm_usb_probe */ 1338} 1339EXPORT_SYMBOL_GPL(usbatm_usb_disconnect); 1340 1341 1342/*********** 1343** init ** 1344***********/ 1345 1346static int __init usbatm_usb_init(void) 1347{ 1348 dbg("%s: driver version %s", __func__, DRIVER_VERSION); 1349 1350 if (sizeof(struct usbatm_control) > FIELD_SIZEOF(struct sk_buff, cb)) { 1351 printk(KERN_ERR "%s unusable with this kernel!\n", usbatm_driver_name); 1352 return -EIO; 1353 } 1354 1355 if ((num_rcv_urbs > UDSL_MAX_RCV_URBS) 1356 || (num_snd_urbs > UDSL_MAX_SND_URBS) 1357 || (rcv_buf_bytes < 1) 1358 || (rcv_buf_bytes > UDSL_MAX_BUF_SIZE) 1359 || (snd_buf_bytes < 1) 1360 || (snd_buf_bytes > UDSL_MAX_BUF_SIZE)) 1361 return -EINVAL; 1362 1363 return 0; 1364} 1365module_init(usbatm_usb_init); 1366 1367static void __exit usbatm_usb_exit(void) 1368{ 1369 dbg("%s", __func__); 1370} 1371module_exit(usbatm_usb_exit); 1372 1373MODULE_AUTHOR(DRIVER_AUTHOR); 1374MODULE_DESCRIPTION(DRIVER_DESC); 1375MODULE_LICENSE("GPL"); 1376MODULE_VERSION(DRIVER_VERSION); 1377 1378/************ 1379** debug ** 1380************/ 1381 1382#ifdef VERBOSE_DEBUG 1383static int usbatm_print_packet(const unsigned char *data, int len) 1384{ 1385 unsigned char buffer[256]; 1386 int i = 0, j = 0; 1387 1388 for (i = 0; i < len;) { 1389 buffer[0] = '\0'; 1390 sprintf(buffer, "%.3d :", i); 1391 for (j = 0; (j < 16) && (i < len); j++, i++) 1392 sprintf(buffer, "%s %2.2x", buffer, data[i]); 1393 dbg("%s", buffer); 1394 } 1395 return i; 1396} 1397#endif 1398