1 /****************************************************************************** 2 * usbatm.c - Generic USB xDSL driver core 3 * 4 * Copyright (C) 2001, Alcatel 5 * Copyright (C) 2003, Duncan Sands, SolNegro, Josep Comas 6 * Copyright (C) 2004, David Woodhouse, Roman Kagan 7 * 8 * This program is free software; you can redistribute it and/or modify it 9 * under the terms of the GNU General Public License as published by the Free 10 * Software Foundation; either version 2 of the License, or (at your option) 11 * any later version. 12 * 13 * This program is distributed in the hope that it will be useful, but WITHOUT 14 * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or 15 * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License for 16 * more details. 17 * 18 * You should have received a copy of the GNU General Public License along with 19 * this program; if not, write to the Free Software Foundation, Inc., 59 20 * Temple Place - Suite 330, Boston, MA 02111-1307, USA. 21 * 22 ******************************************************************************/ 23 24 /* 25 * Written by Johan Verrept, Duncan Sands (duncan.sands@free.fr) and David Woodhouse 26 * 27 * 1.7+: - See the check-in logs 28 * 29 * 1.6: - No longer opens a connection if the firmware is not loaded 30 * - Added support for the speedtouch 330 31 * - Removed the limit on the number of devices 32 * - Module now autoloads on device plugin 33 * - Merged relevant parts of sarlib 34 * - Replaced the kernel thread with a tasklet 35 * - New packet transmission code 36 * - Changed proc file contents 37 * - Fixed all known SMP races 38 * - Many fixes and cleanups 39 * - Various fixes by Oliver Neukum (oliver@neukum.name) 40 * 41 * 1.5A: - Version for inclusion in 2.5 series kernel 42 * - Modifications by Richard Purdie (rpurdie@rpsys.net) 43 * - made compatible with kernel 2.5.6 onwards by changing 44 * usbatm_usb_send_data_context->urb to a pointer and adding code 45 * to alloc and free it 46 * - remove_wait_queue() added to usbatm_atm_processqueue_thread() 47 * 48 * 1.5: - fixed memory leak when atmsar_decode_aal5 returned NULL. 49 * (reported by stephen.robinson@zen.co.uk) 50 * 51 * 1.4: - changed the spin_lock() under interrupt to spin_lock_irqsave() 52 * - unlink all active send urbs of a vcc that is being closed. 53 * 54 * 1.3.1: - added the version number 55 * 56 * 1.3: - Added multiple send urb support 57 * - fixed memory leak and vcc->tx_inuse starvation bug 58 * when not enough memory left in vcc. 59 * 60 * 1.2: - Fixed race condition in usbatm_usb_send_data() 61 * 1.1: - Turned off packet debugging 62 * 63 */ 64 65 #include "usbatm.h" 66 67 #include <asm/uaccess.h> 68 #include <linux/crc32.h> 69 #include <linux/errno.h> 70 #include <linux/init.h> 71 #include <linux/interrupt.h> 72 #include <linux/kernel.h> 73 #include <linux/module.h> 74 #include <linux/moduleparam.h> 75 #include <linux/netdevice.h> 76 #include <linux/proc_fs.h> 77 #include <linux/sched.h> 78 #include <linux/signal.h> 79 #include <linux/slab.h> 80 #include <linux/stat.h> 81 #include <linux/timer.h> 82 #include <linux/wait.h> 83 #include <linux/kthread.h> 84 85 #ifdef VERBOSE_DEBUG 86 static int usbatm_print_packet(const unsigned char *data, int len); 87 #define PACKETDEBUG(arg...) usbatm_print_packet (arg) 88 #define vdbg(arg...) dbg (arg) 89 #else 90 #define PACKETDEBUG(arg...) 91 #define vdbg(arg...) 92 #endif 93 94 #define DRIVER_AUTHOR "Johan Verrept, Duncan Sands <duncan.sands@free.fr>" 95 #define DRIVER_VERSION "1.10" 96 #define DRIVER_DESC "Generic USB ATM/DSL I/O, version " DRIVER_VERSION 97 98 static const char usbatm_driver_name[] = "usbatm"; 99 100 #define UDSL_MAX_RCV_URBS 16 101 #define UDSL_MAX_SND_URBS 16 102 #define UDSL_MAX_BUF_SIZE 65536 103 #define UDSL_DEFAULT_RCV_URBS 4 104 #define UDSL_DEFAULT_SND_URBS 4 105 #define UDSL_DEFAULT_RCV_BUF_SIZE 3392 /* 64 * ATM_CELL_SIZE */ 106 #define UDSL_DEFAULT_SND_BUF_SIZE 3392 /* 64 * ATM_CELL_SIZE */ 107 108 #define ATM_CELL_HEADER (ATM_CELL_SIZE - ATM_CELL_PAYLOAD) 109 110 #define THROTTLE_MSECS 100 /* delay to recover processing after urb submission fails */ 111 112 static unsigned int num_rcv_urbs = UDSL_DEFAULT_RCV_URBS; 113 static unsigned int num_snd_urbs = UDSL_DEFAULT_SND_URBS; 114 static unsigned int rcv_buf_bytes = UDSL_DEFAULT_RCV_BUF_SIZE; 115 static unsigned int snd_buf_bytes = UDSL_DEFAULT_SND_BUF_SIZE; 116 117 module_param(num_rcv_urbs, uint, S_IRUGO); 118 MODULE_PARM_DESC(num_rcv_urbs, 119 "Number of urbs used for reception (range: 0-" 120 __MODULE_STRING(UDSL_MAX_RCV_URBS) ", default: " 121 __MODULE_STRING(UDSL_DEFAULT_RCV_URBS) ")"); 122 123 module_param(num_snd_urbs, uint, S_IRUGO); 124 MODULE_PARM_DESC(num_snd_urbs, 125 "Number of urbs used for transmission (range: 0-" 126 __MODULE_STRING(UDSL_MAX_SND_URBS) ", default: " 127 __MODULE_STRING(UDSL_DEFAULT_SND_URBS) ")"); 128 129 module_param(rcv_buf_bytes, uint, S_IRUGO); 130 MODULE_PARM_DESC(rcv_buf_bytes, 131 "Size of the buffers used for reception, in bytes (range: 1-" 132 __MODULE_STRING(UDSL_MAX_BUF_SIZE) ", default: " 133 __MODULE_STRING(UDSL_DEFAULT_RCV_BUF_SIZE) ")"); 134 135 module_param(snd_buf_bytes, uint, S_IRUGO); 136 MODULE_PARM_DESC(snd_buf_bytes, 137 "Size of the buffers used for transmission, in bytes (range: 1-" 138 __MODULE_STRING(UDSL_MAX_BUF_SIZE) ", default: " 139 __MODULE_STRING(UDSL_DEFAULT_SND_BUF_SIZE) ")"); 140 141 142 /* receive */ 143 144 struct usbatm_vcc_data { 145 /* vpi/vci lookup */ 146 struct list_head list; 147 short vpi; 148 int vci; 149 struct atm_vcc *vcc; 150 151 /* raw cell reassembly */ 152 struct sk_buff *sarb; 153 }; 154 155 156 /* send */ 157 158 struct usbatm_control { 159 struct atm_skb_data atm; 160 u32 len; 161 u32 crc; 162 }; 163 164 #define UDSL_SKB(x) ((struct usbatm_control *)(x)->cb) 165 166 167 /* ATM */ 168 169 static void usbatm_atm_dev_close(struct atm_dev *atm_dev); 170 static int usbatm_atm_open(struct atm_vcc *vcc); 171 static void usbatm_atm_close(struct atm_vcc *vcc); 172 static int usbatm_atm_ioctl(struct atm_dev *atm_dev, unsigned int cmd, void __user * arg); 173 static int usbatm_atm_send(struct atm_vcc *vcc, struct sk_buff *skb); 174 static int usbatm_atm_proc_read(struct atm_dev *atm_dev, loff_t * pos, char *page); 175 176 static struct atmdev_ops usbatm_atm_devops = { 177 .dev_close = usbatm_atm_dev_close, 178 .open = usbatm_atm_open, 179 .close = usbatm_atm_close, 180 .ioctl = usbatm_atm_ioctl, 181 .send = usbatm_atm_send, 182 .proc_read = usbatm_atm_proc_read, 183 .owner = THIS_MODULE, 184 }; 185 186 187 /*********** 188 ** misc ** 189 ***********/ 190 191 static inline unsigned int usbatm_pdu_length(unsigned int length) 192 { 193 length += ATM_CELL_PAYLOAD - 1 + ATM_AAL5_TRAILER; 194 return length - length % ATM_CELL_PAYLOAD; 195 } 196 197 static inline void usbatm_pop(struct atm_vcc *vcc, struct sk_buff *skb) 198 { 199 if (vcc->pop) 200 vcc->pop(vcc, skb); 201 else 202 dev_kfree_skb_any(skb); 203 } 204 205 206 /*********** 207 ** urbs ** 208 ************/ 209 210 static struct urb *usbatm_pop_urb(struct usbatm_channel *channel) 211 { 212 struct urb *urb; 213 214 spin_lock_irq(&channel->lock); 215 if (list_empty(&channel->list)) { 216 spin_unlock_irq(&channel->lock); 217 return NULL; 218 } 219 220 urb = list_entry(channel->list.next, struct urb, urb_list); 221 list_del(&urb->urb_list); 222 spin_unlock_irq(&channel->lock); 223 224 return urb; 225 } 226 227 static int usbatm_submit_urb(struct urb *urb) 228 { 229 struct usbatm_channel *channel = urb->context; 230 int ret; 231 232 vdbg("%s: submitting urb 0x%p, size %u", 233 __func__, urb, urb->transfer_buffer_length); 234 235 ret = usb_submit_urb(urb, GFP_ATOMIC); 236 if (ret) { 237 if (printk_ratelimit()) 238 atm_warn(channel->usbatm, "%s: urb 0x%p submission failed (%d)!\n", 239 __func__, urb, ret); 240 241 /* consider all errors transient and return the buffer back to the queue */ 242 urb->status = -EAGAIN; 243 spin_lock_irq(&channel->lock); 244 245 /* must add to the front when sending; doesn't matter when receiving */ 246 list_add(&urb->urb_list, &channel->list); 247 248 spin_unlock_irq(&channel->lock); 249 250 /* make sure the channel doesn't stall */ 251 mod_timer(&channel->delay, jiffies + msecs_to_jiffies(THROTTLE_MSECS)); 252 } 253 254 return ret; 255 } 256 257 static void usbatm_complete(struct urb *urb) 258 { 259 struct usbatm_channel *channel = urb->context; 260 unsigned long flags; 261 int status = urb->status; 262 263 vdbg("%s: urb 0x%p, status %d, actual_length %d", 264 __func__, urb, status, urb->actual_length); 265 266 /* usually in_interrupt(), but not always */ 267 spin_lock_irqsave(&channel->lock, flags); 268 269 /* must add to the back when receiving; doesn't matter when sending */ 270 list_add_tail(&urb->urb_list, &channel->list); 271 272 spin_unlock_irqrestore(&channel->lock, flags); 273 274 if (unlikely(status) && 275 (!(channel->usbatm->flags & UDSL_IGNORE_EILSEQ) || 276 status != -EILSEQ )) 277 { 278 if (status == -ESHUTDOWN) 279 return; 280 281 if (printk_ratelimit()) 282 atm_warn(channel->usbatm, "%s: urb 0x%p failed (%d)!\n", 283 __func__, urb, status); 284 /* throttle processing in case of an error */ 285 mod_timer(&channel->delay, jiffies + msecs_to_jiffies(THROTTLE_MSECS)); 286 } else 287 tasklet_schedule(&channel->tasklet); 288 } 289 290 291 /************* 292 ** decode ** 293 *************/ 294 295 static inline struct usbatm_vcc_data *usbatm_find_vcc(struct usbatm_data *instance, 296 short vpi, int vci) 297 { 298 struct usbatm_vcc_data *vcc_data; 299 300 list_for_each_entry(vcc_data, &instance->vcc_list, list) 301 if ((vcc_data->vci == vci) && (vcc_data->vpi == vpi)) 302 return vcc_data; 303 return NULL; 304 } 305 306 static void usbatm_extract_one_cell(struct usbatm_data *instance, unsigned char *source) 307 { 308 struct atm_vcc *vcc; 309 struct sk_buff *sarb; 310 short vpi = ((source[0] & 0x0f) << 4) | (source[1] >> 4); 311 int vci = ((source[1] & 0x0f) << 12) | (source[2] << 4) | (source[3] >> 4); 312 u8 pti = ((source[3] & 0xe) >> 1); 313 314 vdbg("%s: vpi %hd, vci %d, pti %d", __func__, vpi, vci, pti); 315 316 if ((vci != instance->cached_vci) || (vpi != instance->cached_vpi)) { 317 instance->cached_vpi = vpi; 318 instance->cached_vci = vci; 319 320 instance->cached_vcc = usbatm_find_vcc(instance, vpi, vci); 321 322 if (!instance->cached_vcc) 323 atm_rldbg(instance, "%s: unknown vpi/vci (%hd/%d)!\n", __func__, vpi, vci); 324 } 325 326 if (!instance->cached_vcc) 327 return; 328 329 vcc = instance->cached_vcc->vcc; 330 331 /* OAM F5 end-to-end */ 332 if (pti == ATM_PTI_E2EF5) { 333 if (printk_ratelimit()) 334 atm_warn(instance, "%s: OAM not supported (vpi %d, vci %d)!\n", 335 __func__, vpi, vci); 336 atomic_inc(&vcc->stats->rx_err); 337 return; 338 } 339 340 sarb = instance->cached_vcc->sarb; 341 342 if (sarb->tail + ATM_CELL_PAYLOAD > sarb->end) { 343 atm_rldbg(instance, "%s: buffer overrun (sarb->len %u, vcc: 0x%p)!\n", 344 __func__, sarb->len, vcc); 345 /* discard cells already received */ 346 skb_trim(sarb, 0); 347 UDSL_ASSERT(instance, sarb->tail + ATM_CELL_PAYLOAD <= sarb->end); 348 } 349 350 memcpy(skb_tail_pointer(sarb), source + ATM_CELL_HEADER, ATM_CELL_PAYLOAD); 351 __skb_put(sarb, ATM_CELL_PAYLOAD); 352 353 if (pti & 1) { 354 struct sk_buff *skb; 355 unsigned int length; 356 unsigned int pdu_length; 357 358 length = (source[ATM_CELL_SIZE - 6] << 8) + source[ATM_CELL_SIZE - 5]; 359 360 /* guard against overflow */ 361 if (length > ATM_MAX_AAL5_PDU) { 362 atm_rldbg(instance, "%s: bogus length %u (vcc: 0x%p)!\n", 363 __func__, length, vcc); 364 atomic_inc(&vcc->stats->rx_err); 365 goto out; 366 } 367 368 pdu_length = usbatm_pdu_length(length); 369 370 if (sarb->len < pdu_length) { 371 atm_rldbg(instance, "%s: bogus pdu_length %u (sarb->len: %u, vcc: 0x%p)!\n", 372 __func__, pdu_length, sarb->len, vcc); 373 atomic_inc(&vcc->stats->rx_err); 374 goto out; 375 } 376 377 if (crc32_be(~0, skb_tail_pointer(sarb) - pdu_length, pdu_length) != 0xc704dd7b) { 378 atm_rldbg(instance, "%s: packet failed crc check (vcc: 0x%p)!\n", 379 __func__, vcc); 380 atomic_inc(&vcc->stats->rx_err); 381 goto out; 382 } 383 384 vdbg("%s: got packet (length: %u, pdu_length: %u, vcc: 0x%p)", __func__, length, pdu_length, vcc); 385 386 if (!(skb = dev_alloc_skb(length))) { 387 if (printk_ratelimit()) 388 atm_err(instance, "%s: no memory for skb (length: %u)!\n", 389 __func__, length); 390 atomic_inc(&vcc->stats->rx_drop); 391 goto out; 392 } 393 394 vdbg("%s: allocated new sk_buff (skb: 0x%p, skb->truesize: %u)", __func__, skb, skb->truesize); 395 396 if (!atm_charge(vcc, skb->truesize)) { 397 atm_rldbg(instance, "%s: failed atm_charge (skb->truesize: %u)!\n", 398 __func__, skb->truesize); 399 dev_kfree_skb_any(skb); 400 goto out; /* atm_charge increments rx_drop */ 401 } 402 403 skb_copy_to_linear_data(skb, 404 skb_tail_pointer(sarb) - pdu_length, 405 length); 406 __skb_put(skb, length); 407 408 vdbg("%s: sending skb 0x%p, skb->len %u, skb->truesize %u", 409 __func__, skb, skb->len, skb->truesize); 410 411 PACKETDEBUG(skb->data, skb->len); 412 413 vcc->push(vcc, skb); 414 415 atomic_inc(&vcc->stats->rx); 416 out: 417 skb_trim(sarb, 0); 418 } 419 } 420 421 static void usbatm_extract_cells(struct usbatm_data *instance, 422 unsigned char *source, unsigned int avail_data) 423 { 424 unsigned int stride = instance->rx_channel.stride; 425 unsigned int buf_usage = instance->buf_usage; 426 427 /* extract cells from incoming data, taking into account that 428 * the length of avail data may not be a multiple of stride */ 429 430 if (buf_usage > 0) { 431 /* we have a partially received atm cell */ 432 unsigned char *cell_buf = instance->cell_buf; 433 unsigned int space_left = stride - buf_usage; 434 435 UDSL_ASSERT(instance, buf_usage <= stride); 436 437 if (avail_data >= space_left) { 438 /* add new data and process cell */ 439 memcpy(cell_buf + buf_usage, source, space_left); 440 source += space_left; 441 avail_data -= space_left; 442 usbatm_extract_one_cell(instance, cell_buf); 443 instance->buf_usage = 0; 444 } else { 445 /* not enough data to fill the cell */ 446 memcpy(cell_buf + buf_usage, source, avail_data); 447 instance->buf_usage = buf_usage + avail_data; 448 return; 449 } 450 } 451 452 for (; avail_data >= stride; avail_data -= stride, source += stride) 453 usbatm_extract_one_cell(instance, source); 454 455 if (avail_data > 0) { 456 /* length was not a multiple of stride - 457 * save remaining data for next call */ 458 memcpy(instance->cell_buf, source, avail_data); 459 instance->buf_usage = avail_data; 460 } 461 } 462 463 464 /************* 465 ** encode ** 466 *************/ 467 468 static unsigned int usbatm_write_cells(struct usbatm_data *instance, 469 struct sk_buff *skb, 470 u8 *target, unsigned int avail_space) 471 { 472 struct usbatm_control *ctrl = UDSL_SKB(skb); 473 struct atm_vcc *vcc = ctrl->atm.vcc; 474 unsigned int bytes_written; 475 unsigned int stride = instance->tx_channel.stride; 476 477 vdbg("%s: skb->len=%d, avail_space=%u", __func__, skb->len, avail_space); 478 UDSL_ASSERT(instance, !(avail_space % stride)); 479 480 for (bytes_written = 0; bytes_written < avail_space && ctrl->len; 481 bytes_written += stride, target += stride) { 482 unsigned int data_len = min_t(unsigned int, skb->len, ATM_CELL_PAYLOAD); 483 unsigned int left = ATM_CELL_PAYLOAD - data_len; 484 u8 *ptr = target; 485 486 ptr[0] = vcc->vpi >> 4; 487 ptr[1] = (vcc->vpi << 4) | (vcc->vci >> 12); 488 ptr[2] = vcc->vci >> 4; 489 ptr[3] = vcc->vci << 4; 490 ptr[4] = 0xec; 491 ptr += ATM_CELL_HEADER; 492 493 skb_copy_from_linear_data(skb, ptr, data_len); 494 ptr += data_len; 495 __skb_pull(skb, data_len); 496 497 if(!left) 498 continue; 499 500 memset(ptr, 0, left); 501 502 if (left >= ATM_AAL5_TRAILER) { /* trailer will go in this cell */ 503 u8 *trailer = target + ATM_CELL_SIZE - ATM_AAL5_TRAILER; 504 /* trailer[0] = 0; UU = 0 */ 505 /* trailer[1] = 0; CPI = 0 */ 506 trailer[2] = ctrl->len >> 8; 507 trailer[3] = ctrl->len; 508 509 ctrl->crc = ~ crc32_be(ctrl->crc, ptr, left - 4); 510 511 trailer[4] = ctrl->crc >> 24; 512 trailer[5] = ctrl->crc >> 16; 513 trailer[6] = ctrl->crc >> 8; 514 trailer[7] = ctrl->crc; 515 516 target[3] |= 0x2; /* adjust PTI */ 517 518 ctrl->len = 0; /* tag this skb finished */ 519 } 520 else 521 ctrl->crc = crc32_be(ctrl->crc, ptr, left); 522 } 523 524 return bytes_written; 525 } 526 527 528 /************** 529 ** receive ** 530 **************/ 531 532 static void usbatm_rx_process(unsigned long data) 533 { 534 struct usbatm_data *instance = (struct usbatm_data *)data; 535 struct urb *urb; 536 537 while ((urb = usbatm_pop_urb(&instance->rx_channel))) { 538 vdbg("%s: processing urb 0x%p", __func__, urb); 539 540 if (usb_pipeisoc(urb->pipe)) { 541 unsigned char *merge_start = NULL; 542 unsigned int merge_length = 0; 543 const unsigned int packet_size = instance->rx_channel.packet_size; 544 int i; 545 546 for (i = 0; i < urb->number_of_packets; i++) { 547 if (!urb->iso_frame_desc[i].status) { 548 unsigned int actual_length = urb->iso_frame_desc[i].actual_length; 549 550 UDSL_ASSERT(instance, actual_length <= packet_size); 551 552 if (!merge_length) 553 merge_start = (unsigned char *)urb->transfer_buffer + urb->iso_frame_desc[i].offset; 554 merge_length += actual_length; 555 if (merge_length && (actual_length < packet_size)) { 556 usbatm_extract_cells(instance, merge_start, merge_length); 557 merge_length = 0; 558 } 559 } else { 560 atm_rldbg(instance, "%s: status %d in frame %d!\n", __func__, urb->status, i); 561 if (merge_length) 562 usbatm_extract_cells(instance, merge_start, merge_length); 563 merge_length = 0; 564 instance->buf_usage = 0; 565 } 566 } 567 568 if (merge_length) 569 usbatm_extract_cells(instance, merge_start, merge_length); 570 } else 571 if (!urb->status) 572 usbatm_extract_cells(instance, urb->transfer_buffer, urb->actual_length); 573 else 574 instance->buf_usage = 0; 575 576 if (usbatm_submit_urb(urb)) 577 return; 578 } 579 } 580 581 582 /*********** 583 ** send ** 584 ***********/ 585 586 static void usbatm_tx_process(unsigned long data) 587 { 588 struct usbatm_data *instance = (struct usbatm_data *)data; 589 struct sk_buff *skb = instance->current_skb; 590 struct urb *urb = NULL; 591 const unsigned int buf_size = instance->tx_channel.buf_size; 592 unsigned int bytes_written = 0; 593 u8 *buffer = NULL; 594 595 if (!skb) 596 skb = skb_dequeue(&instance->sndqueue); 597 598 while (skb) { 599 if (!urb) { 600 urb = usbatm_pop_urb(&instance->tx_channel); 601 if (!urb) 602 break; /* no more senders */ 603 buffer = urb->transfer_buffer; 604 bytes_written = (urb->status == -EAGAIN) ? 605 urb->transfer_buffer_length : 0; 606 } 607 608 bytes_written += usbatm_write_cells(instance, skb, 609 buffer + bytes_written, 610 buf_size - bytes_written); 611 612 vdbg("%s: wrote %u bytes from skb 0x%p to urb 0x%p", 613 __func__, bytes_written, skb, urb); 614 615 if (!UDSL_SKB(skb)->len) { 616 struct atm_vcc *vcc = UDSL_SKB(skb)->atm.vcc; 617 618 usbatm_pop(vcc, skb); 619 atomic_inc(&vcc->stats->tx); 620 621 skb = skb_dequeue(&instance->sndqueue); 622 } 623 624 if (bytes_written == buf_size || (!skb && bytes_written)) { 625 urb->transfer_buffer_length = bytes_written; 626 627 if (usbatm_submit_urb(urb)) 628 break; 629 urb = NULL; 630 } 631 } 632 633 instance->current_skb = skb; 634 } 635 636 static void usbatm_cancel_send(struct usbatm_data *instance, 637 struct atm_vcc *vcc) 638 { 639 struct sk_buff *skb, *n; 640 641 atm_dbg(instance, "%s entered\n", __func__); 642 spin_lock_irq(&instance->sndqueue.lock); 643 skb_queue_walk_safe(&instance->sndqueue, skb, n) { 644 if (UDSL_SKB(skb)->atm.vcc == vcc) { 645 atm_dbg(instance, "%s: popping skb 0x%p\n", __func__, skb); 646 __skb_unlink(skb, &instance->sndqueue); 647 usbatm_pop(vcc, skb); 648 } 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: %pM\n", atm_dev->esi); 774 775 if (!left--) 776 return sprintf(page, 777 "AAL5: tx %d ( %d err ), rx %d ( %d err, %d drop )\n", 778 atomic_read(&atm_dev->stats.aal5.tx), 779 atomic_read(&atm_dev->stats.aal5.tx_err), 780 atomic_read(&atm_dev->stats.aal5.rx), 781 atomic_read(&atm_dev->stats.aal5.rx_err), 782 atomic_read(&atm_dev->stats.aal5.rx_drop)); 783 784 if (!left--) { 785 if (instance->disconnected) 786 return sprintf(page, "Disconnected\n"); 787 else 788 switch (atm_dev->signal) { 789 case ATM_PHY_SIG_FOUND: 790 return sprintf(page, "Line up\n"); 791 case ATM_PHY_SIG_LOST: 792 return sprintf(page, "Line down\n"); 793 default: 794 return sprintf(page, "Line state unknown\n"); 795 } 796 } 797 798 return 0; 799 } 800 801 static int usbatm_atm_open(struct atm_vcc *vcc) 802 { 803 struct usbatm_data *instance = vcc->dev->dev_data; 804 struct usbatm_vcc_data *new = NULL; 805 int ret; 806 int vci = vcc->vci; 807 short vpi = vcc->vpi; 808 809 if (!instance) { 810 dbg("%s: NULL data!", __func__); 811 return -ENODEV; 812 } 813 814 atm_dbg(instance, "%s: vpi %hd, vci %d\n", __func__, vpi, vci); 815 816 /* only support AAL5 */ 817 if ((vcc->qos.aal != ATM_AAL5)) { 818 atm_warn(instance, "%s: unsupported ATM type %d!\n", __func__, vcc->qos.aal); 819 return -EINVAL; 820 } 821 822 /* sanity checks */ 823 if ((vcc->qos.rxtp.max_sdu < 0) || (vcc->qos.rxtp.max_sdu > ATM_MAX_AAL5_PDU)) { 824 atm_dbg(instance, "%s: max_sdu %d out of range!\n", __func__, vcc->qos.rxtp.max_sdu); 825 return -EINVAL; 826 } 827 828 mutex_lock(&instance->serialize); /* vs self, usbatm_atm_close, usbatm_usb_disconnect */ 829 830 if (instance->disconnected) { 831 atm_dbg(instance, "%s: disconnected!\n", __func__); 832 ret = -ENODEV; 833 goto fail; 834 } 835 836 if (usbatm_find_vcc(instance, vpi, vci)) { 837 atm_dbg(instance, "%s: %hd/%d already in use!\n", __func__, vpi, vci); 838 ret = -EADDRINUSE; 839 goto fail; 840 } 841 842 if (!(new = kzalloc(sizeof(struct usbatm_vcc_data), GFP_KERNEL))) { 843 atm_err(instance, "%s: no memory for vcc_data!\n", __func__); 844 ret = -ENOMEM; 845 goto fail; 846 } 847 848 new->vcc = vcc; 849 new->vpi = vpi; 850 new->vci = vci; 851 852 new->sarb = alloc_skb(usbatm_pdu_length(vcc->qos.rxtp.max_sdu), GFP_KERNEL); 853 if (!new->sarb) { 854 atm_err(instance, "%s: no memory for SAR buffer!\n", __func__); 855 ret = -ENOMEM; 856 goto fail; 857 } 858 859 vcc->dev_data = new; 860 861 tasklet_disable(&instance->rx_channel.tasklet); 862 instance->cached_vcc = new; 863 instance->cached_vpi = vpi; 864 instance->cached_vci = vci; 865 list_add(&new->list, &instance->vcc_list); 866 tasklet_enable(&instance->rx_channel.tasklet); 867 868 set_bit(ATM_VF_ADDR, &vcc->flags); 869 set_bit(ATM_VF_PARTIAL, &vcc->flags); 870 set_bit(ATM_VF_READY, &vcc->flags); 871 872 mutex_unlock(&instance->serialize); 873 874 atm_dbg(instance, "%s: allocated vcc data 0x%p\n", __func__, new); 875 876 return 0; 877 878 fail: 879 kfree(new); 880 mutex_unlock(&instance->serialize); 881 return ret; 882 } 883 884 static void usbatm_atm_close(struct atm_vcc *vcc) 885 { 886 struct usbatm_data *instance = vcc->dev->dev_data; 887 struct usbatm_vcc_data *vcc_data = vcc->dev_data; 888 889 if (!instance || !vcc_data) { 890 dbg("%s: NULL data!", __func__); 891 return; 892 } 893 894 atm_dbg(instance, "%s entered\n", __func__); 895 896 atm_dbg(instance, "%s: deallocating vcc 0x%p with vpi %d vci %d\n", 897 __func__, vcc_data, vcc_data->vpi, vcc_data->vci); 898 899 usbatm_cancel_send(instance, vcc); 900 901 mutex_lock(&instance->serialize); /* vs self, usbatm_atm_open, usbatm_usb_disconnect */ 902 903 tasklet_disable(&instance->rx_channel.tasklet); 904 if (instance->cached_vcc == vcc_data) { 905 instance->cached_vcc = NULL; 906 instance->cached_vpi = ATM_VPI_UNSPEC; 907 instance->cached_vci = ATM_VCI_UNSPEC; 908 } 909 list_del(&vcc_data->list); 910 tasklet_enable(&instance->rx_channel.tasklet); 911 912 kfree_skb(vcc_data->sarb); 913 vcc_data->sarb = NULL; 914 915 kfree(vcc_data); 916 vcc->dev_data = NULL; 917 918 vcc->vpi = ATM_VPI_UNSPEC; 919 vcc->vci = ATM_VCI_UNSPEC; 920 clear_bit(ATM_VF_READY, &vcc->flags); 921 clear_bit(ATM_VF_PARTIAL, &vcc->flags); 922 clear_bit(ATM_VF_ADDR, &vcc->flags); 923 924 mutex_unlock(&instance->serialize); 925 926 atm_dbg(instance, "%s successful\n", __func__); 927 } 928 929 static int usbatm_atm_ioctl(struct atm_dev *atm_dev, unsigned int cmd, 930 void __user * arg) 931 { 932 struct usbatm_data *instance = atm_dev->dev_data; 933 934 if (!instance || instance->disconnected) { 935 dbg("%s: %s!", __func__, instance ? "disconnected" : "NULL instance"); 936 return -ENODEV; 937 } 938 939 switch (cmd) { 940 case ATM_QUERYLOOP: 941 return put_user(ATM_LM_NONE, (int __user *)arg) ? -EFAULT : 0; 942 default: 943 return -ENOIOCTLCMD; 944 } 945 } 946 947 static int usbatm_atm_init(struct usbatm_data *instance) 948 { 949 struct atm_dev *atm_dev; 950 int ret, i; 951 952 /* ATM init. The ATM initialization scheme suffers from an intrinsic race 953 * condition: callbacks we register can be executed at once, before we have 954 * initialized the struct atm_dev. To protect against this, all callbacks 955 * abort if atm_dev->dev_data is NULL. */ 956 atm_dev = atm_dev_register(instance->driver_name, &usbatm_atm_devops, -1, NULL); 957 if (!atm_dev) { 958 usb_err(instance, "%s: failed to register ATM device!\n", __func__); 959 return -1; 960 } 961 962 instance->atm_dev = atm_dev; 963 964 atm_dev->ci_range.vpi_bits = ATM_CI_MAX; 965 atm_dev->ci_range.vci_bits = ATM_CI_MAX; 966 atm_dev->signal = ATM_PHY_SIG_UNKNOWN; 967 968 /* temp init ATM device, set to 128kbit */ 969 atm_dev->link_rate = 128 * 1000 / 424; 970 971 ret = sysfs_create_link(&atm_dev->class_dev.kobj, 972 &instance->usb_intf->dev.kobj, "device"); 973 if (ret) { 974 atm_err(instance, "%s: sysfs_create_link failed: %d\n", 975 __func__, ret); 976 goto fail_sysfs; 977 } 978 979 if (instance->driver->atm_start && ((ret = instance->driver->atm_start(instance, atm_dev)) < 0)) { 980 atm_err(instance, "%s: atm_start failed: %d!\n", __func__, ret); 981 goto fail; 982 } 983 984 usbatm_get_instance(instance); /* dropped in usbatm_atm_dev_close */ 985 986 /* ready for ATM callbacks */ 987 mb(); 988 atm_dev->dev_data = instance; 989 990 /* submit all rx URBs */ 991 for (i = 0; i < num_rcv_urbs; i++) 992 usbatm_submit_urb(instance->urbs[i]); 993 994 return 0; 995 996 fail: 997 sysfs_remove_link(&atm_dev->class_dev.kobj, "device"); 998 fail_sysfs: 999 instance->atm_dev = NULL; 1000 atm_dev_deregister(atm_dev); /* usbatm_atm_dev_close will eventually be called */ 1001 return ret; 1002 } 1003 1004 1005 /********** 1006 ** USB ** 1007 **********/ 1008 1009 static int usbatm_do_heavy_init(void *arg) 1010 { 1011 struct usbatm_data *instance = arg; 1012 int ret; 1013 1014 allow_signal(SIGTERM); 1015 complete(&instance->thread_started); 1016 1017 ret = instance->driver->heavy_init(instance, instance->usb_intf); 1018 1019 if (!ret) 1020 ret = usbatm_atm_init(instance); 1021 1022 mutex_lock(&instance->serialize); 1023 instance->thread = NULL; 1024 mutex_unlock(&instance->serialize); 1025 1026 complete_and_exit(&instance->thread_exited, ret); 1027 } 1028 1029 static int usbatm_heavy_init(struct usbatm_data *instance) 1030 { 1031 struct task_struct *t; 1032 1033 t = kthread_create(usbatm_do_heavy_init, instance, 1034 instance->driver->driver_name); 1035 if (IS_ERR(t)) { 1036 usb_err(instance, "%s: failed to create kernel_thread (%ld)!\n", 1037 __func__, PTR_ERR(t)); 1038 return PTR_ERR(t); 1039 } 1040 1041 instance->thread = t; 1042 wake_up_process(t); 1043 wait_for_completion(&instance->thread_started); 1044 1045 return 0; 1046 } 1047 1048 static void usbatm_tasklet_schedule(unsigned long data) 1049 { 1050 tasklet_schedule((struct tasklet_struct *) data); 1051 } 1052 1053 static void usbatm_init_channel(struct usbatm_channel *channel) 1054 { 1055 spin_lock_init(&channel->lock); 1056 INIT_LIST_HEAD(&channel->list); 1057 channel->delay.function = usbatm_tasklet_schedule; 1058 channel->delay.data = (unsigned long) &channel->tasklet; 1059 init_timer(&channel->delay); 1060 } 1061 1062 int usbatm_usb_probe(struct usb_interface *intf, const struct usb_device_id *id, 1063 struct usbatm_driver *driver) 1064 { 1065 struct device *dev = &intf->dev; 1066 struct usb_device *usb_dev = interface_to_usbdev(intf); 1067 struct usbatm_data *instance; 1068 char *buf; 1069 int error = -ENOMEM; 1070 int i, length; 1071 unsigned int maxpacket, num_packets; 1072 1073 dev_dbg(dev, "%s: trying driver %s with vendor=%04x, product=%04x, ifnum %2d\n", 1074 __func__, driver->driver_name, 1075 le16_to_cpu(usb_dev->descriptor.idVendor), 1076 le16_to_cpu(usb_dev->descriptor.idProduct), 1077 intf->altsetting->desc.bInterfaceNumber); 1078 1079 /* instance init */ 1080 instance = kzalloc(sizeof(*instance) + sizeof(struct urb *) * (num_rcv_urbs + num_snd_urbs), GFP_KERNEL); 1081 if (!instance) { 1082 dev_err(dev, "%s: no memory for instance data!\n", __func__); 1083 return -ENOMEM; 1084 } 1085 1086 /* public fields */ 1087 1088 instance->driver = driver; 1089 snprintf(instance->driver_name, sizeof(instance->driver_name), driver->driver_name); 1090 1091 instance->usb_dev = usb_dev; 1092 instance->usb_intf = intf; 1093 1094 buf = instance->description; 1095 length = sizeof(instance->description); 1096 1097 if ((i = usb_string(usb_dev, usb_dev->descriptor.iProduct, buf, length)) < 0) 1098 goto bind; 1099 1100 buf += i; 1101 length -= i; 1102 1103 i = scnprintf(buf, length, " ("); 1104 buf += i; 1105 length -= i; 1106 1107 if (length <= 0 || (i = usb_make_path(usb_dev, buf, length)) < 0) 1108 goto bind; 1109 1110 buf += i; 1111 length -= i; 1112 1113 snprintf(buf, length, ")"); 1114 1115 bind: 1116 if (driver->bind && (error = driver->bind(instance, intf, id)) < 0) { 1117 dev_err(dev, "%s: bind failed: %d!\n", __func__, error); 1118 goto fail_free; 1119 } 1120 1121 /* private fields */ 1122 1123 kref_init(&instance->refcount); /* dropped in usbatm_usb_disconnect */ 1124 mutex_init(&instance->serialize); 1125 1126 instance->thread = NULL; 1127 init_completion(&instance->thread_started); 1128 init_completion(&instance->thread_exited); 1129 1130 INIT_LIST_HEAD(&instance->vcc_list); 1131 skb_queue_head_init(&instance->sndqueue); 1132 1133 usbatm_init_channel(&instance->rx_channel); 1134 usbatm_init_channel(&instance->tx_channel); 1135 tasklet_init(&instance->rx_channel.tasklet, usbatm_rx_process, (unsigned long)instance); 1136 tasklet_init(&instance->tx_channel.tasklet, usbatm_tx_process, (unsigned long)instance); 1137 instance->rx_channel.stride = ATM_CELL_SIZE + driver->rx_padding; 1138 instance->tx_channel.stride = ATM_CELL_SIZE + driver->tx_padding; 1139 instance->rx_channel.usbatm = instance->tx_channel.usbatm = instance; 1140 1141 if ((instance->flags & UDSL_USE_ISOC) && driver->isoc_in) 1142 instance->rx_channel.endpoint = usb_rcvisocpipe(usb_dev, driver->isoc_in); 1143 else 1144 instance->rx_channel.endpoint = usb_rcvbulkpipe(usb_dev, driver->bulk_in); 1145 1146 instance->tx_channel.endpoint = usb_sndbulkpipe(usb_dev, driver->bulk_out); 1147 1148 /* tx buffer size must be a positive multiple of the stride */ 1149 instance->tx_channel.buf_size = max (instance->tx_channel.stride, 1150 snd_buf_bytes - (snd_buf_bytes % instance->tx_channel.stride)); 1151 1152 /* rx buffer size must be a positive multiple of the endpoint maxpacket */ 1153 maxpacket = usb_maxpacket(usb_dev, instance->rx_channel.endpoint, 0); 1154 1155 if ((maxpacket < 1) || (maxpacket > UDSL_MAX_BUF_SIZE)) { 1156 dev_err(dev, "%s: invalid endpoint %02x!\n", __func__, 1157 usb_pipeendpoint(instance->rx_channel.endpoint)); 1158 error = -EINVAL; 1159 goto fail_unbind; 1160 } 1161 1162 num_packets = max (1U, (rcv_buf_bytes + maxpacket / 2) / maxpacket); /* round */ 1163 1164 if (num_packets * maxpacket > UDSL_MAX_BUF_SIZE) 1165 num_packets--; 1166 1167 instance->rx_channel.buf_size = num_packets * maxpacket; 1168 instance->rx_channel.packet_size = maxpacket; 1169 1170 #ifdef DEBUG 1171 for (i = 0; i < 2; i++) { 1172 struct usbatm_channel *channel = i ? 1173 &instance->tx_channel : &instance->rx_channel; 1174 1175 dev_dbg(dev, "%s: using %d byte buffer for %s channel 0x%p\n", __func__, channel->buf_size, i ? "tx" : "rx", channel); 1176 } 1177 #endif 1178 1179 /* initialize urbs */ 1180 1181 for (i = 0; i < num_rcv_urbs + num_snd_urbs; i++) { 1182 u8 *buffer; 1183 struct usbatm_channel *channel = i < num_rcv_urbs ? 1184 &instance->rx_channel : &instance->tx_channel; 1185 struct urb *urb; 1186 unsigned int iso_packets = usb_pipeisoc(channel->endpoint) ? channel->buf_size / channel->packet_size : 0; 1187 1188 UDSL_ASSERT(instance, !usb_pipeisoc(channel->endpoint) || usb_pipein(channel->endpoint)); 1189 1190 urb = usb_alloc_urb(iso_packets, GFP_KERNEL); 1191 if (!urb) { 1192 dev_err(dev, "%s: no memory for urb %d!\n", __func__, i); 1193 error = -ENOMEM; 1194 goto fail_unbind; 1195 } 1196 1197 instance->urbs[i] = urb; 1198 1199 /* zero the tx padding to avoid leaking information */ 1200 buffer = kzalloc(channel->buf_size, GFP_KERNEL); 1201 if (!buffer) { 1202 dev_err(dev, "%s: no memory for buffer %d!\n", __func__, i); 1203 error = -ENOMEM; 1204 goto fail_unbind; 1205 } 1206 1207 usb_fill_bulk_urb(urb, instance->usb_dev, channel->endpoint, 1208 buffer, channel->buf_size, usbatm_complete, channel); 1209 if (iso_packets) { 1210 int j; 1211 urb->interval = 1; 1212 urb->transfer_flags = URB_ISO_ASAP; 1213 urb->number_of_packets = iso_packets; 1214 for (j = 0; j < iso_packets; j++) { 1215 urb->iso_frame_desc[j].offset = channel->packet_size * j; 1216 urb->iso_frame_desc[j].length = channel->packet_size; 1217 } 1218 } 1219 1220 /* put all tx URBs on the list of spares */ 1221 if (i >= num_rcv_urbs) 1222 list_add_tail(&urb->urb_list, &channel->list); 1223 1224 vdbg("%s: alloced buffer 0x%p buf size %u urb 0x%p", 1225 __func__, urb->transfer_buffer, urb->transfer_buffer_length, urb); 1226 } 1227 1228 instance->cached_vpi = ATM_VPI_UNSPEC; 1229 instance->cached_vci = ATM_VCI_UNSPEC; 1230 instance->cell_buf = kmalloc(instance->rx_channel.stride, GFP_KERNEL); 1231 1232 if (!instance->cell_buf) { 1233 dev_err(dev, "%s: no memory for cell buffer!\n", __func__); 1234 error = -ENOMEM; 1235 goto fail_unbind; 1236 } 1237 1238 if (!(instance->flags & UDSL_SKIP_HEAVY_INIT) && driver->heavy_init) { 1239 error = usbatm_heavy_init(instance); 1240 } else { 1241 complete(&instance->thread_exited); /* pretend that heavy_init was run */ 1242 error = usbatm_atm_init(instance); 1243 } 1244 1245 if (error < 0) 1246 goto fail_unbind; 1247 1248 usb_get_dev(usb_dev); 1249 usb_set_intfdata(intf, instance); 1250 1251 return 0; 1252 1253 fail_unbind: 1254 if (instance->driver->unbind) 1255 instance->driver->unbind(instance, intf); 1256 fail_free: 1257 kfree(instance->cell_buf); 1258 1259 for (i = 0; i < num_rcv_urbs + num_snd_urbs; i++) { 1260 if (instance->urbs[i]) 1261 kfree(instance->urbs[i]->transfer_buffer); 1262 usb_free_urb(instance->urbs[i]); 1263 } 1264 1265 kfree (instance); 1266 1267 return error; 1268 } 1269 EXPORT_SYMBOL_GPL(usbatm_usb_probe); 1270 1271 void usbatm_usb_disconnect(struct usb_interface *intf) 1272 { 1273 struct device *dev = &intf->dev; 1274 struct usbatm_data *instance = usb_get_intfdata(intf); 1275 struct usbatm_vcc_data *vcc_data; 1276 int i; 1277 1278 dev_dbg(dev, "%s entered\n", __func__); 1279 1280 if (!instance) { 1281 dev_dbg(dev, "%s: NULL instance!\n", __func__); 1282 return; 1283 } 1284 1285 usb_set_intfdata(intf, NULL); 1286 1287 mutex_lock(&instance->serialize); 1288 instance->disconnected = 1; 1289 if (instance->thread != NULL) 1290 send_sig(SIGTERM, instance->thread, 1); 1291 mutex_unlock(&instance->serialize); 1292 1293 wait_for_completion(&instance->thread_exited); 1294 1295 mutex_lock(&instance->serialize); 1296 list_for_each_entry(vcc_data, &instance->vcc_list, list) 1297 vcc_release_async(vcc_data->vcc, -EPIPE); 1298 mutex_unlock(&instance->serialize); 1299 1300 tasklet_disable(&instance->rx_channel.tasklet); 1301 tasklet_disable(&instance->tx_channel.tasklet); 1302 1303 for (i = 0; i < num_rcv_urbs + num_snd_urbs; i++) 1304 usb_kill_urb(instance->urbs[i]); 1305 1306 del_timer_sync(&instance->rx_channel.delay); 1307 del_timer_sync(&instance->tx_channel.delay); 1308 1309 /* turn usbatm_[rt]x_process into something close to a no-op */ 1310 /* no need to take the spinlock */ 1311 INIT_LIST_HEAD(&instance->rx_channel.list); 1312 INIT_LIST_HEAD(&instance->tx_channel.list); 1313 1314 tasklet_enable(&instance->rx_channel.tasklet); 1315 tasklet_enable(&instance->tx_channel.tasklet); 1316 1317 if (instance->atm_dev && instance->driver->atm_stop) 1318 instance->driver->atm_stop(instance, instance->atm_dev); 1319 1320 if (instance->driver->unbind) 1321 instance->driver->unbind(instance, intf); 1322 1323 instance->driver_data = NULL; 1324 1325 for (i = 0; i < num_rcv_urbs + num_snd_urbs; i++) { 1326 kfree(instance->urbs[i]->transfer_buffer); 1327 usb_free_urb(instance->urbs[i]); 1328 } 1329 1330 kfree(instance->cell_buf); 1331 1332 /* ATM finalize */ 1333 if (instance->atm_dev) { 1334 sysfs_remove_link(&instance->atm_dev->class_dev.kobj, "device"); 1335 atm_dev_deregister(instance->atm_dev); 1336 } 1337 1338 usbatm_put_instance(instance); /* taken in usbatm_usb_probe */ 1339 } 1340 EXPORT_SYMBOL_GPL(usbatm_usb_disconnect); 1341 1342 1343 /*********** 1344 ** init ** 1345 ***********/ 1346 1347 static int __init usbatm_usb_init(void) 1348 { 1349 dbg("%s: driver version %s", __func__, DRIVER_VERSION); 1350 1351 if (sizeof(struct usbatm_control) > sizeof(((struct sk_buff *) 0)->cb)) { 1352 printk(KERN_ERR "%s unusable with this kernel!\n", usbatm_driver_name); 1353 return -EIO; 1354 } 1355 1356 if ((num_rcv_urbs > UDSL_MAX_RCV_URBS) 1357 || (num_snd_urbs > UDSL_MAX_SND_URBS) 1358 || (rcv_buf_bytes < 1) 1359 || (rcv_buf_bytes > UDSL_MAX_BUF_SIZE) 1360 || (snd_buf_bytes < 1) 1361 || (snd_buf_bytes > UDSL_MAX_BUF_SIZE)) 1362 return -EINVAL; 1363 1364 return 0; 1365 } 1366 module_init(usbatm_usb_init); 1367 1368 static void __exit usbatm_usb_exit(void) 1369 { 1370 dbg("%s", __func__); 1371 } 1372 module_exit(usbatm_usb_exit); 1373 1374 MODULE_AUTHOR(DRIVER_AUTHOR); 1375 MODULE_DESCRIPTION(DRIVER_DESC); 1376 MODULE_LICENSE("GPL"); 1377 MODULE_VERSION(DRIVER_VERSION); 1378 1379 /************ 1380 ** debug ** 1381 ************/ 1382 1383 #ifdef VERBOSE_DEBUG 1384 static int usbatm_print_packet(const unsigned char *data, int len) 1385 { 1386 unsigned char buffer[256]; 1387 int i = 0, j = 0; 1388 1389 for (i = 0; i < len;) { 1390 buffer[0] = '\0'; 1391 sprintf(buffer, "%.3d :", i); 1392 for (j = 0; (j < 16) && (i < len); j++, i++) { 1393 sprintf(buffer, "%s %2.2x", buffer, data[i]); 1394 } 1395 dbg("%s", buffer); 1396 } 1397 return i; 1398 } 1399 #endif 1400