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 84 #ifdef VERBOSE_DEBUG 85 static int usbatm_print_packet(const unsigned char *data, int len); 86 #define PACKETDEBUG(arg...) usbatm_print_packet (arg) 87 #define vdbg(arg...) dbg (arg) 88 #else 89 #define PACKETDEBUG(arg...) 90 #define vdbg(arg...) 91 #endif 92 93 #define DRIVER_AUTHOR "Johan Verrept, Duncan Sands <duncan.sands@free.fr>" 94 #define DRIVER_VERSION "1.10" 95 #define DRIVER_DESC "Generic USB ATM/DSL I/O, version " DRIVER_VERSION 96 97 static const char usbatm_driver_name[] = "usbatm"; 98 99 #define UDSL_MAX_RCV_URBS 16 100 #define UDSL_MAX_SND_URBS 16 101 #define UDSL_MAX_BUF_SIZE 65536 102 #define UDSL_DEFAULT_RCV_URBS 4 103 #define UDSL_DEFAULT_SND_URBS 4 104 #define UDSL_DEFAULT_RCV_BUF_SIZE 3392 /* 64 * ATM_CELL_SIZE */ 105 #define UDSL_DEFAULT_SND_BUF_SIZE 3392 /* 64 * ATM_CELL_SIZE */ 106 107 #define ATM_CELL_HEADER (ATM_CELL_SIZE - ATM_CELL_PAYLOAD) 108 109 #define THROTTLE_MSECS 100 /* delay to recover processing after urb submission fails */ 110 111 static unsigned int num_rcv_urbs = UDSL_DEFAULT_RCV_URBS; 112 static unsigned int num_snd_urbs = UDSL_DEFAULT_SND_URBS; 113 static unsigned int rcv_buf_bytes = UDSL_DEFAULT_RCV_BUF_SIZE; 114 static unsigned int snd_buf_bytes = UDSL_DEFAULT_SND_BUF_SIZE; 115 116 module_param(num_rcv_urbs, uint, S_IRUGO); 117 MODULE_PARM_DESC(num_rcv_urbs, 118 "Number of urbs used for reception (range: 0-" 119 __MODULE_STRING(UDSL_MAX_RCV_URBS) ", default: " 120 __MODULE_STRING(UDSL_DEFAULT_RCV_URBS) ")"); 121 122 module_param(num_snd_urbs, uint, S_IRUGO); 123 MODULE_PARM_DESC(num_snd_urbs, 124 "Number of urbs used for transmission (range: 0-" 125 __MODULE_STRING(UDSL_MAX_SND_URBS) ", default: " 126 __MODULE_STRING(UDSL_DEFAULT_SND_URBS) ")"); 127 128 module_param(rcv_buf_bytes, uint, S_IRUGO); 129 MODULE_PARM_DESC(rcv_buf_bytes, 130 "Size of the buffers used for reception, in bytes (range: 1-" 131 __MODULE_STRING(UDSL_MAX_BUF_SIZE) ", default: " 132 __MODULE_STRING(UDSL_DEFAULT_RCV_BUF_SIZE) ")"); 133 134 module_param(snd_buf_bytes, uint, S_IRUGO); 135 MODULE_PARM_DESC(snd_buf_bytes, 136 "Size of the buffers used for transmission, in bytes (range: 1-" 137 __MODULE_STRING(UDSL_MAX_BUF_SIZE) ", default: " 138 __MODULE_STRING(UDSL_DEFAULT_SND_BUF_SIZE) ")"); 139 140 141 /* receive */ 142 143 struct usbatm_vcc_data { 144 /* vpi/vci lookup */ 145 struct list_head list; 146 short vpi; 147 int vci; 148 struct atm_vcc *vcc; 149 150 /* raw cell reassembly */ 151 struct sk_buff *sarb; 152 }; 153 154 155 /* send */ 156 157 struct usbatm_control { 158 struct atm_skb_data atm; 159 u32 len; 160 u32 crc; 161 }; 162 163 #define UDSL_SKB(x) ((struct usbatm_control *)(x)->cb) 164 165 166 /* ATM */ 167 168 static void usbatm_atm_dev_close(struct atm_dev *atm_dev); 169 static int usbatm_atm_open(struct atm_vcc *vcc); 170 static void usbatm_atm_close(struct atm_vcc *vcc); 171 static int usbatm_atm_ioctl(struct atm_dev *atm_dev, unsigned int cmd, void __user * arg); 172 static int usbatm_atm_send(struct atm_vcc *vcc, struct sk_buff *skb); 173 static int usbatm_atm_proc_read(struct atm_dev *atm_dev, loff_t * pos, char *page); 174 175 static struct atmdev_ops usbatm_atm_devops = { 176 .dev_close = usbatm_atm_dev_close, 177 .open = usbatm_atm_open, 178 .close = usbatm_atm_close, 179 .ioctl = usbatm_atm_ioctl, 180 .send = usbatm_atm_send, 181 .proc_read = usbatm_atm_proc_read, 182 .owner = THIS_MODULE, 183 }; 184 185 186 /*********** 187 ** misc ** 188 ***********/ 189 190 static inline unsigned int usbatm_pdu_length(unsigned int length) 191 { 192 length += ATM_CELL_PAYLOAD - 1 + ATM_AAL5_TRAILER; 193 return length - length % ATM_CELL_PAYLOAD; 194 } 195 196 static inline void usbatm_pop(struct atm_vcc *vcc, struct sk_buff *skb) 197 { 198 if (vcc->pop) 199 vcc->pop(vcc, skb); 200 else 201 dev_kfree_skb_any(skb); 202 } 203 204 205 /*********** 206 ** urbs ** 207 ************/ 208 209 static struct urb *usbatm_pop_urb(struct usbatm_channel *channel) 210 { 211 struct urb *urb; 212 213 spin_lock_irq(&channel->lock); 214 if (list_empty(&channel->list)) { 215 spin_unlock_irq(&channel->lock); 216 return NULL; 217 } 218 219 urb = list_entry(channel->list.next, struct urb, urb_list); 220 list_del(&urb->urb_list); 221 spin_unlock_irq(&channel->lock); 222 223 return urb; 224 } 225 226 static int usbatm_submit_urb(struct urb *urb) 227 { 228 struct usbatm_channel *channel = urb->context; 229 int ret; 230 231 vdbg("%s: submitting urb 0x%p, size %u", 232 __func__, urb, urb->transfer_buffer_length); 233 234 ret = usb_submit_urb(urb, GFP_ATOMIC); 235 if (ret) { 236 if (printk_ratelimit()) 237 atm_warn(channel->usbatm, "%s: urb 0x%p submission failed (%d)!\n", 238 __func__, urb, ret); 239 240 /* consider all errors transient and return the buffer back to the queue */ 241 urb->status = -EAGAIN; 242 spin_lock_irq(&channel->lock); 243 244 /* must add to the front when sending; doesn't matter when receiving */ 245 list_add(&urb->urb_list, &channel->list); 246 247 spin_unlock_irq(&channel->lock); 248 249 /* make sure the channel doesn't stall */ 250 mod_timer(&channel->delay, jiffies + msecs_to_jiffies(THROTTLE_MSECS)); 251 } 252 253 return ret; 254 } 255 256 static void usbatm_complete(struct urb *urb) 257 { 258 struct usbatm_channel *channel = urb->context; 259 unsigned long flags; 260 int status = urb->status; 261 262 vdbg("%s: urb 0x%p, status %d, actual_length %d", 263 __func__, 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(status) && 274 (!(channel->usbatm->flags & UDSL_IGNORE_EILSEQ) || 275 status != -EILSEQ )) 276 { 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 *************/ 293 294 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_FS | CLONE_FILES); 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 1401