1 /****************************************************************************** 2 * usbatm.c - Generic USB xDSL driver core 3 * 4 * Copyright (C) 2001, Alcatel 5 * Copyright (C) 2003, Duncan Sands, SolNegro, Josep Comas 6 * Copyright (C) 2004, David Woodhouse, Roman Kagan 7 * 8 * This program is free software; you can redistribute it and/or modify it 9 * under the terms of the GNU General Public License as published by the Free 10 * Software Foundation; either version 2 of the License, or (at your option) 11 * any later version. 12 * 13 * This program is distributed in the hope that it will be useful, but WITHOUT 14 * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or 15 * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License for 16 * more details. 17 * 18 * You should have received a copy of the GNU General Public License along with 19 * this program; if not, write to the Free Software Foundation, Inc., 59 20 * Temple Place - Suite 330, Boston, MA 02111-1307, USA. 21 * 22 ******************************************************************************/ 23 24 /* 25 * Written by Johan Verrept, Duncan Sands (duncan.sands@free.fr) and David Woodhouse 26 * 27 * 1.7+: - See the check-in logs 28 * 29 * 1.6: - No longer opens a connection if the firmware is not loaded 30 * - Added support for the speedtouch 330 31 * - Removed the limit on the number of devices 32 * - Module now autoloads on device plugin 33 * - Merged relevant parts of sarlib 34 * - Replaced the kernel thread with a tasklet 35 * - New packet transmission code 36 * - Changed proc file contents 37 * - Fixed all known SMP races 38 * - Many fixes and cleanups 39 * - Various fixes by Oliver Neukum (oliver@neukum.name) 40 * 41 * 1.5A: - Version for inclusion in 2.5 series kernel 42 * - Modifications by Richard Purdie (rpurdie@rpsys.net) 43 * - made compatible with kernel 2.5.6 onwards by changing 44 * usbatm_usb_send_data_context->urb to a pointer and adding code 45 * to alloc and free it 46 * - remove_wait_queue() added to usbatm_atm_processqueue_thread() 47 * 48 * 1.5: - fixed memory leak when atmsar_decode_aal5 returned NULL. 49 * (reported by stephen.robinson@zen.co.uk) 50 * 51 * 1.4: - changed the spin_lock() under interrupt to spin_lock_irqsave() 52 * - unlink all active send urbs of a vcc that is being closed. 53 * 54 * 1.3.1: - added the version number 55 * 56 * 1.3: - Added multiple send urb support 57 * - fixed memory leak and vcc->tx_inuse starvation bug 58 * when not enough memory left in vcc. 59 * 60 * 1.2: - Fixed race condition in usbatm_usb_send_data() 61 * 1.1: - Turned off packet debugging 62 * 63 */ 64 65 #include "usbatm.h" 66 67 #include <asm/uaccess.h> 68 #include <linux/crc32.h> 69 #include <linux/errno.h> 70 #include <linux/init.h> 71 #include <linux/interrupt.h> 72 #include <linux/kernel.h> 73 #include <linux/module.h> 74 #include <linux/moduleparam.h> 75 #include <linux/netdevice.h> 76 #include <linux/proc_fs.h> 77 #include <linux/sched.h> 78 #include <linux/signal.h> 79 #include <linux/slab.h> 80 #include <linux/smp_lock.h> 81 #include <linux/stat.h> 82 #include <linux/timer.h> 83 #include <linux/wait.h> 84 85 #ifdef VERBOSE_DEBUG 86 static int usbatm_print_packet(const unsigned char *data, int len); 87 #define PACKETDEBUG(arg...) usbatm_print_packet (arg) 88 #define vdbg(arg...) dbg (arg) 89 #else 90 #define PACKETDEBUG(arg...) 91 #define vdbg(arg...) 92 #endif 93 94 #define DRIVER_AUTHOR "Johan Verrept, Duncan Sands <duncan.sands@free.fr>" 95 #define DRIVER_VERSION "1.10" 96 #define DRIVER_DESC "Generic USB ATM/DSL I/O, version " DRIVER_VERSION 97 98 static const char usbatm_driver_name[] = "usbatm"; 99 100 #define UDSL_MAX_RCV_URBS 16 101 #define UDSL_MAX_SND_URBS 16 102 #define UDSL_MAX_BUF_SIZE 65536 103 #define UDSL_DEFAULT_RCV_URBS 4 104 #define UDSL_DEFAULT_SND_URBS 4 105 #define UDSL_DEFAULT_RCV_BUF_SIZE 3392 /* 64 * ATM_CELL_SIZE */ 106 #define UDSL_DEFAULT_SND_BUF_SIZE 3392 /* 64 * ATM_CELL_SIZE */ 107 108 #define ATM_CELL_HEADER (ATM_CELL_SIZE - ATM_CELL_PAYLOAD) 109 110 #define THROTTLE_MSECS 100 /* delay to recover processing after urb submission fails */ 111 112 static unsigned int num_rcv_urbs = UDSL_DEFAULT_RCV_URBS; 113 static unsigned int num_snd_urbs = UDSL_DEFAULT_SND_URBS; 114 static unsigned int rcv_buf_bytes = UDSL_DEFAULT_RCV_BUF_SIZE; 115 static unsigned int snd_buf_bytes = UDSL_DEFAULT_SND_BUF_SIZE; 116 117 module_param(num_rcv_urbs, uint, S_IRUGO); 118 MODULE_PARM_DESC(num_rcv_urbs, 119 "Number of urbs used for reception (range: 0-" 120 __MODULE_STRING(UDSL_MAX_RCV_URBS) ", default: " 121 __MODULE_STRING(UDSL_DEFAULT_RCV_URBS) ")"); 122 123 module_param(num_snd_urbs, uint, S_IRUGO); 124 MODULE_PARM_DESC(num_snd_urbs, 125 "Number of urbs used for transmission (range: 0-" 126 __MODULE_STRING(UDSL_MAX_SND_URBS) ", default: " 127 __MODULE_STRING(UDSL_DEFAULT_SND_URBS) ")"); 128 129 module_param(rcv_buf_bytes, uint, S_IRUGO); 130 MODULE_PARM_DESC(rcv_buf_bytes, 131 "Size of the buffers used for reception, in bytes (range: 1-" 132 __MODULE_STRING(UDSL_MAX_BUF_SIZE) ", default: " 133 __MODULE_STRING(UDSL_DEFAULT_RCV_BUF_SIZE) ")"); 134 135 module_param(snd_buf_bytes, uint, S_IRUGO); 136 MODULE_PARM_DESC(snd_buf_bytes, 137 "Size of the buffers used for transmission, in bytes (range: 1-" 138 __MODULE_STRING(UDSL_MAX_BUF_SIZE) ", default: " 139 __MODULE_STRING(UDSL_DEFAULT_SND_BUF_SIZE) ")"); 140 141 142 /* receive */ 143 144 struct usbatm_vcc_data { 145 /* vpi/vci lookup */ 146 struct list_head list; 147 short vpi; 148 int vci; 149 struct atm_vcc *vcc; 150 151 /* raw cell reassembly */ 152 struct sk_buff *sarb; 153 }; 154 155 156 /* send */ 157 158 struct usbatm_control { 159 struct atm_skb_data atm; 160 u32 len; 161 u32 crc; 162 }; 163 164 #define UDSL_SKB(x) ((struct usbatm_control *)(x)->cb) 165 166 167 /* ATM */ 168 169 static void usbatm_atm_dev_close(struct atm_dev *atm_dev); 170 static int usbatm_atm_open(struct atm_vcc *vcc); 171 static void usbatm_atm_close(struct atm_vcc *vcc); 172 static int usbatm_atm_ioctl(struct atm_dev *atm_dev, unsigned int cmd, void __user * arg); 173 static int usbatm_atm_send(struct atm_vcc *vcc, struct sk_buff *skb); 174 static int usbatm_atm_proc_read(struct atm_dev *atm_dev, loff_t * pos, char *page); 175 176 static struct atmdev_ops usbatm_atm_devops = { 177 .dev_close = usbatm_atm_dev_close, 178 .open = usbatm_atm_open, 179 .close = usbatm_atm_close, 180 .ioctl = usbatm_atm_ioctl, 181 .send = usbatm_atm_send, 182 .proc_read = usbatm_atm_proc_read, 183 .owner = THIS_MODULE, 184 }; 185 186 187 /*********** 188 ** misc ** 189 ***********/ 190 191 static inline unsigned int usbatm_pdu_length(unsigned int length) 192 { 193 length += ATM_CELL_PAYLOAD - 1 + ATM_AAL5_TRAILER; 194 return length - length % ATM_CELL_PAYLOAD; 195 } 196 197 static inline void usbatm_pop(struct atm_vcc *vcc, struct sk_buff *skb) 198 { 199 if (vcc->pop) 200 vcc->pop(vcc, skb); 201 else 202 dev_kfree_skb_any(skb); 203 } 204 205 206 /*********** 207 ** urbs ** 208 ************/ 209 210 static struct urb *usbatm_pop_urb(struct usbatm_channel *channel) 211 { 212 struct urb *urb; 213 214 spin_lock_irq(&channel->lock); 215 if (list_empty(&channel->list)) { 216 spin_unlock_irq(&channel->lock); 217 return NULL; 218 } 219 220 urb = list_entry(channel->list.next, struct urb, urb_list); 221 list_del(&urb->urb_list); 222 spin_unlock_irq(&channel->lock); 223 224 return urb; 225 } 226 227 static int usbatm_submit_urb(struct urb *urb) 228 { 229 struct usbatm_channel *channel = urb->context; 230 int ret; 231 232 vdbg("%s: submitting urb 0x%p, size %u", 233 __func__, urb, urb->transfer_buffer_length); 234 235 ret = usb_submit_urb(urb, GFP_ATOMIC); 236 if (ret) { 237 if (printk_ratelimit()) 238 atm_warn(channel->usbatm, "%s: urb 0x%p submission failed (%d)!\n", 239 __func__, urb, ret); 240 241 /* consider all errors transient and return the buffer back to the queue */ 242 urb->status = -EAGAIN; 243 spin_lock_irq(&channel->lock); 244 245 /* must add to the front when sending; doesn't matter when receiving */ 246 list_add(&urb->urb_list, &channel->list); 247 248 spin_unlock_irq(&channel->lock); 249 250 /* make sure the channel doesn't stall */ 251 mod_timer(&channel->delay, jiffies + msecs_to_jiffies(THROTTLE_MSECS)); 252 } 253 254 return ret; 255 } 256 257 static void usbatm_complete(struct urb *urb, struct pt_regs *regs) 258 { 259 struct usbatm_channel *channel = urb->context; 260 unsigned long flags; 261 262 vdbg("%s: urb 0x%p, status %d, actual_length %d", 263 __func__, urb, urb->status, urb->actual_length); 264 265 /* usually in_interrupt(), but not always */ 266 spin_lock_irqsave(&channel->lock, flags); 267 268 /* must add to the back when receiving; doesn't matter when sending */ 269 list_add_tail(&urb->urb_list, &channel->list); 270 271 spin_unlock_irqrestore(&channel->lock, flags); 272 273 if (unlikely(urb->status) && 274 (!(channel->usbatm->flags & UDSL_IGNORE_EILSEQ) || 275 urb->status != -EILSEQ )) 276 { 277 if (printk_ratelimit()) 278 atm_warn(channel->usbatm, "%s: urb 0x%p failed (%d)!\n", 279 __func__, urb, urb->status); 280 /* throttle processing in case of an error */ 281 mod_timer(&channel->delay, jiffies + msecs_to_jiffies(THROTTLE_MSECS)); 282 } else 283 tasklet_schedule(&channel->tasklet); 284 } 285 286 287 /************* 288 ** decode ** 289 *************/ 290 291 static inline struct usbatm_vcc_data *usbatm_find_vcc(struct usbatm_data *instance, 292 short vpi, int vci) 293 { 294 struct usbatm_vcc_data *vcc_data; 295 296 list_for_each_entry(vcc_data, &instance->vcc_list, list) 297 if ((vcc_data->vci == vci) && (vcc_data->vpi == vpi)) 298 return vcc_data; 299 return NULL; 300 } 301 302 static void usbatm_extract_one_cell(struct usbatm_data *instance, unsigned char *source) 303 { 304 struct atm_vcc *vcc; 305 struct sk_buff *sarb; 306 short vpi = ((source[0] & 0x0f) << 4) | (source[1] >> 4); 307 int vci = ((source[1] & 0x0f) << 12) | (source[2] << 4) | (source[3] >> 4); 308 u8 pti = ((source[3] & 0xe) >> 1); 309 310 vdbg("%s: vpi %hd, vci %d, pti %d", __func__, vpi, vci, pti); 311 312 if ((vci != instance->cached_vci) || (vpi != instance->cached_vpi)) { 313 instance->cached_vpi = vpi; 314 instance->cached_vci = vci; 315 316 instance->cached_vcc = usbatm_find_vcc(instance, vpi, vci); 317 318 if (!instance->cached_vcc) 319 atm_rldbg(instance, "%s: unknown vpi/vci (%hd/%d)!\n", __func__, vpi, vci); 320 } 321 322 if (!instance->cached_vcc) 323 return; 324 325 vcc = instance->cached_vcc->vcc; 326 327 /* OAM F5 end-to-end */ 328 if (pti == ATM_PTI_E2EF5) { 329 if (printk_ratelimit()) 330 atm_warn(instance, "%s: OAM not supported (vpi %d, vci %d)!\n", 331 __func__, vpi, vci); 332 atomic_inc(&vcc->stats->rx_err); 333 return; 334 } 335 336 sarb = instance->cached_vcc->sarb; 337 338 if (sarb->tail + ATM_CELL_PAYLOAD > sarb->end) { 339 atm_rldbg(instance, "%s: buffer overrun (sarb->len %u, vcc: 0x%p)!\n", 340 __func__, sarb->len, vcc); 341 /* discard cells already received */ 342 skb_trim(sarb, 0); 343 UDSL_ASSERT(sarb->tail + ATM_CELL_PAYLOAD <= sarb->end); 344 } 345 346 memcpy(sarb->tail, source + ATM_CELL_HEADER, ATM_CELL_PAYLOAD); 347 __skb_put(sarb, ATM_CELL_PAYLOAD); 348 349 if (pti & 1) { 350 struct sk_buff *skb; 351 unsigned int length; 352 unsigned int pdu_length; 353 354 length = (source[ATM_CELL_SIZE - 6] << 8) + source[ATM_CELL_SIZE - 5]; 355 356 /* guard against overflow */ 357 if (length > ATM_MAX_AAL5_PDU) { 358 atm_rldbg(instance, "%s: bogus length %u (vcc: 0x%p)!\n", 359 __func__, length, vcc); 360 atomic_inc(&vcc->stats->rx_err); 361 goto out; 362 } 363 364 pdu_length = usbatm_pdu_length(length); 365 366 if (sarb->len < pdu_length) { 367 atm_rldbg(instance, "%s: bogus pdu_length %u (sarb->len: %u, vcc: 0x%p)!\n", 368 __func__, pdu_length, sarb->len, vcc); 369 atomic_inc(&vcc->stats->rx_err); 370 goto out; 371 } 372 373 if (crc32_be(~0, sarb->tail - pdu_length, pdu_length) != 0xc704dd7b) { 374 atm_rldbg(instance, "%s: packet failed crc check (vcc: 0x%p)!\n", 375 __func__, vcc); 376 atomic_inc(&vcc->stats->rx_err); 377 goto out; 378 } 379 380 vdbg("%s: got packet (length: %u, pdu_length: %u, vcc: 0x%p)", __func__, length, pdu_length, vcc); 381 382 if (!(skb = dev_alloc_skb(length))) { 383 if (printk_ratelimit()) 384 atm_err(instance, "%s: no memory for skb (length: %u)!\n", 385 __func__, length); 386 atomic_inc(&vcc->stats->rx_drop); 387 goto out; 388 } 389 390 vdbg("%s: allocated new sk_buff (skb: 0x%p, skb->truesize: %u)", __func__, skb, skb->truesize); 391 392 if (!atm_charge(vcc, skb->truesize)) { 393 atm_rldbg(instance, "%s: failed atm_charge (skb->truesize: %u)!\n", 394 __func__, skb->truesize); 395 dev_kfree_skb_any(skb); 396 goto out; /* atm_charge increments rx_drop */ 397 } 398 399 memcpy(skb->data, sarb->tail - pdu_length, length); 400 __skb_put(skb, length); 401 402 vdbg("%s: sending skb 0x%p, skb->len %u, skb->truesize %u", 403 __func__, skb, skb->len, skb->truesize); 404 405 PACKETDEBUG(skb->data, skb->len); 406 407 vcc->push(vcc, skb); 408 409 atomic_inc(&vcc->stats->rx); 410 out: 411 skb_trim(sarb, 0); 412 } 413 } 414 415 static void usbatm_extract_cells(struct usbatm_data *instance, 416 unsigned char *source, unsigned int avail_data) 417 { 418 unsigned int stride = instance->rx_channel.stride; 419 unsigned int buf_usage = instance->buf_usage; 420 421 /* extract cells from incoming data, taking into account that 422 * the length of avail data may not be a multiple of stride */ 423 424 if (buf_usage > 0) { 425 /* we have a partially received atm cell */ 426 unsigned char *cell_buf = instance->cell_buf; 427 unsigned int space_left = stride - buf_usage; 428 429 UDSL_ASSERT(buf_usage <= stride); 430 431 if (avail_data >= space_left) { 432 /* add new data and process cell */ 433 memcpy(cell_buf + buf_usage, source, space_left); 434 source += space_left; 435 avail_data -= space_left; 436 usbatm_extract_one_cell(instance, cell_buf); 437 instance->buf_usage = 0; 438 } else { 439 /* not enough data to fill the cell */ 440 memcpy(cell_buf + buf_usage, source, avail_data); 441 instance->buf_usage = buf_usage + avail_data; 442 return; 443 } 444 } 445 446 for (; avail_data >= stride; avail_data -= stride, source += stride) 447 usbatm_extract_one_cell(instance, source); 448 449 if (avail_data > 0) { 450 /* length was not a multiple of stride - 451 * save remaining data for next call */ 452 memcpy(instance->cell_buf, source, avail_data); 453 instance->buf_usage = avail_data; 454 } 455 } 456 457 458 /************* 459 ** encode ** 460 *************/ 461 462 static unsigned int usbatm_write_cells(struct usbatm_data *instance, 463 struct sk_buff *skb, 464 u8 *target, unsigned int avail_space) 465 { 466 struct usbatm_control *ctrl = UDSL_SKB(skb); 467 struct atm_vcc *vcc = ctrl->atm.vcc; 468 unsigned int bytes_written; 469 unsigned int stride = instance->tx_channel.stride; 470 471 vdbg("%s: skb->len=%d, avail_space=%u", __func__, skb->len, avail_space); 472 UDSL_ASSERT(!(avail_space % stride)); 473 474 for (bytes_written = 0; bytes_written < avail_space && ctrl->len; 475 bytes_written += stride, target += stride) { 476 unsigned int data_len = min_t(unsigned int, skb->len, ATM_CELL_PAYLOAD); 477 unsigned int left = ATM_CELL_PAYLOAD - data_len; 478 u8 *ptr = target; 479 480 ptr[0] = vcc->vpi >> 4; 481 ptr[1] = (vcc->vpi << 4) | (vcc->vci >> 12); 482 ptr[2] = vcc->vci >> 4; 483 ptr[3] = vcc->vci << 4; 484 ptr[4] = 0xec; 485 ptr += ATM_CELL_HEADER; 486 487 memcpy(ptr, skb->data, data_len); 488 ptr += data_len; 489 __skb_pull(skb, data_len); 490 491 if(!left) 492 continue; 493 494 memset(ptr, 0, left); 495 496 if (left >= ATM_AAL5_TRAILER) { /* trailer will go in this cell */ 497 u8 *trailer = target + ATM_CELL_SIZE - ATM_AAL5_TRAILER; 498 /* trailer[0] = 0; UU = 0 */ 499 /* trailer[1] = 0; CPI = 0 */ 500 trailer[2] = ctrl->len >> 8; 501 trailer[3] = ctrl->len; 502 503 ctrl->crc = ~ crc32_be(ctrl->crc, ptr, left - 4); 504 505 trailer[4] = ctrl->crc >> 24; 506 trailer[5] = ctrl->crc >> 16; 507 trailer[6] = ctrl->crc >> 8; 508 trailer[7] = ctrl->crc; 509 510 target[3] |= 0x2; /* adjust PTI */ 511 512 ctrl->len = 0; /* tag this skb finished */ 513 } 514 else 515 ctrl->crc = crc32_be(ctrl->crc, ptr, left); 516 } 517 518 return bytes_written; 519 } 520 521 522 /************** 523 ** receive ** 524 **************/ 525 526 static void usbatm_rx_process(unsigned long data) 527 { 528 struct usbatm_data *instance = (struct usbatm_data *)data; 529 struct urb *urb; 530 531 while ((urb = usbatm_pop_urb(&instance->rx_channel))) { 532 vdbg("%s: processing urb 0x%p", __func__, urb); 533 534 if (usb_pipeisoc(urb->pipe)) { 535 unsigned char *merge_start = NULL; 536 unsigned int merge_length = 0; 537 const unsigned int packet_size = instance->rx_channel.packet_size; 538 int i; 539 540 for (i = 0; i < urb->number_of_packets; i++) { 541 if (!urb->iso_frame_desc[i].status) { 542 unsigned int actual_length = urb->iso_frame_desc[i].actual_length; 543 544 UDSL_ASSERT(actual_length <= packet_size); 545 546 if (!merge_length) 547 merge_start = (unsigned char *)urb->transfer_buffer + urb->iso_frame_desc[i].offset; 548 merge_length += actual_length; 549 if (merge_length && (actual_length < packet_size)) { 550 usbatm_extract_cells(instance, merge_start, merge_length); 551 merge_length = 0; 552 } 553 } else { 554 atm_rldbg(instance, "%s: status %d in frame %d!\n", __func__, urb->status, i); 555 if (merge_length) 556 usbatm_extract_cells(instance, merge_start, merge_length); 557 merge_length = 0; 558 instance->buf_usage = 0; 559 } 560 } 561 562 if (merge_length) 563 usbatm_extract_cells(instance, merge_start, merge_length); 564 } else 565 if (!urb->status) 566 usbatm_extract_cells(instance, urb->transfer_buffer, urb->actual_length); 567 else 568 instance->buf_usage = 0; 569 570 if (usbatm_submit_urb(urb)) 571 return; 572 } 573 } 574 575 576 /*********** 577 ** send ** 578 ***********/ 579 580 static void usbatm_tx_process(unsigned long data) 581 { 582 struct usbatm_data *instance = (struct usbatm_data *)data; 583 struct sk_buff *skb = instance->current_skb; 584 struct urb *urb = NULL; 585 const unsigned int buf_size = instance->tx_channel.buf_size; 586 unsigned int bytes_written = 0; 587 u8 *buffer = NULL; 588 589 if (!skb) 590 skb = skb_dequeue(&instance->sndqueue); 591 592 while (skb) { 593 if (!urb) { 594 urb = usbatm_pop_urb(&instance->tx_channel); 595 if (!urb) 596 break; /* no more senders */ 597 buffer = urb->transfer_buffer; 598 bytes_written = (urb->status == -EAGAIN) ? 599 urb->transfer_buffer_length : 0; 600 } 601 602 bytes_written += usbatm_write_cells(instance, skb, 603 buffer + bytes_written, 604 buf_size - bytes_written); 605 606 vdbg("%s: wrote %u bytes from skb 0x%p to urb 0x%p", 607 __func__, bytes_written, skb, urb); 608 609 if (!UDSL_SKB(skb)->len) { 610 struct atm_vcc *vcc = UDSL_SKB(skb)->atm.vcc; 611 612 usbatm_pop(vcc, skb); 613 atomic_inc(&vcc->stats->tx); 614 615 skb = skb_dequeue(&instance->sndqueue); 616 } 617 618 if (bytes_written == buf_size || (!skb && bytes_written)) { 619 urb->transfer_buffer_length = bytes_written; 620 621 if (usbatm_submit_urb(urb)) 622 break; 623 urb = NULL; 624 } 625 } 626 627 instance->current_skb = skb; 628 } 629 630 static void usbatm_cancel_send(struct usbatm_data *instance, 631 struct atm_vcc *vcc) 632 { 633 struct sk_buff *skb, *n; 634 635 atm_dbg(instance, "%s entered\n", __func__); 636 spin_lock_irq(&instance->sndqueue.lock); 637 for (skb = instance->sndqueue.next, n = skb->next; 638 skb != (struct sk_buff *)&instance->sndqueue; 639 skb = n, n = skb->next) 640 if (UDSL_SKB(skb)->atm.vcc == vcc) { 641 atm_dbg(instance, "%s: popping skb 0x%p\n", __func__, skb); 642 __skb_unlink(skb, &instance->sndqueue); 643 usbatm_pop(vcc, skb); 644 } 645 spin_unlock_irq(&instance->sndqueue.lock); 646 647 tasklet_disable(&instance->tx_channel.tasklet); 648 if ((skb = instance->current_skb) && (UDSL_SKB(skb)->atm.vcc == vcc)) { 649 atm_dbg(instance, "%s: popping current skb (0x%p)\n", __func__, skb); 650 instance->current_skb = NULL; 651 usbatm_pop(vcc, skb); 652 } 653 tasklet_enable(&instance->tx_channel.tasklet); 654 atm_dbg(instance, "%s done\n", __func__); 655 } 656 657 static int usbatm_atm_send(struct atm_vcc *vcc, struct sk_buff *skb) 658 { 659 struct usbatm_data *instance = vcc->dev->dev_data; 660 struct usbatm_control *ctrl = UDSL_SKB(skb); 661 int err; 662 663 vdbg("%s called (skb 0x%p, len %u)", __func__, skb, skb->len); 664 665 /* racy disconnection check - fine */ 666 if (!instance || instance->disconnected) { 667 #ifdef DEBUG 668 if (printk_ratelimit()) 669 printk(KERN_DEBUG "%s: %s!\n", __func__, instance ? "disconnected" : "NULL instance"); 670 #endif 671 err = -ENODEV; 672 goto fail; 673 } 674 675 if (vcc->qos.aal != ATM_AAL5) { 676 atm_rldbg(instance, "%s: unsupported ATM type %d!\n", __func__, vcc->qos.aal); 677 err = -EINVAL; 678 goto fail; 679 } 680 681 if (skb->len > ATM_MAX_AAL5_PDU) { 682 atm_rldbg(instance, "%s: packet too long (%d vs %d)!\n", 683 __func__, skb->len, ATM_MAX_AAL5_PDU); 684 err = -EINVAL; 685 goto fail; 686 } 687 688 PACKETDEBUG(skb->data, skb->len); 689 690 /* initialize the control block */ 691 ctrl->atm.vcc = vcc; 692 ctrl->len = skb->len; 693 ctrl->crc = crc32_be(~0, skb->data, skb->len); 694 695 skb_queue_tail(&instance->sndqueue, skb); 696 tasklet_schedule(&instance->tx_channel.tasklet); 697 698 return 0; 699 700 fail: 701 usbatm_pop(vcc, skb); 702 return err; 703 } 704 705 706 /******************** 707 ** bean counting ** 708 ********************/ 709 710 static void usbatm_destroy_instance(struct kref *kref) 711 { 712 struct usbatm_data *instance = container_of(kref, struct usbatm_data, refcount); 713 714 dbg("%s", __func__); 715 716 tasklet_kill(&instance->rx_channel.tasklet); 717 tasklet_kill(&instance->tx_channel.tasklet); 718 usb_put_dev(instance->usb_dev); 719 kfree(instance); 720 } 721 722 static void usbatm_get_instance(struct usbatm_data *instance) 723 { 724 dbg("%s", __func__); 725 726 kref_get(&instance->refcount); 727 } 728 729 static void usbatm_put_instance(struct usbatm_data *instance) 730 { 731 dbg("%s", __func__); 732 733 kref_put(&instance->refcount, usbatm_destroy_instance); 734 } 735 736 737 /********** 738 ** ATM ** 739 **********/ 740 741 static void usbatm_atm_dev_close(struct atm_dev *atm_dev) 742 { 743 struct usbatm_data *instance = atm_dev->dev_data; 744 745 dbg("%s", __func__); 746 747 if (!instance) 748 return; 749 750 atm_dev->dev_data = NULL; /* catch bugs */ 751 usbatm_put_instance(instance); /* taken in usbatm_atm_init */ 752 } 753 754 static int usbatm_atm_proc_read(struct atm_dev *atm_dev, loff_t * pos, char *page) 755 { 756 struct usbatm_data *instance = atm_dev->dev_data; 757 int left = *pos; 758 759 if (!instance) { 760 dbg("%s: NULL instance!", __func__); 761 return -ENODEV; 762 } 763 764 if (!left--) 765 return sprintf(page, "%s\n", instance->description); 766 767 if (!left--) 768 return sprintf(page, "MAC: %02x:%02x:%02x:%02x:%02x:%02x\n", 769 atm_dev->esi[0], atm_dev->esi[1], 770 atm_dev->esi[2], atm_dev->esi[3], 771 atm_dev->esi[4], atm_dev->esi[5]); 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 } 798 799 static 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; 875 876 fail: 877 kfree(new); 878 mutex_unlock(&instance->serialize); 879 return ret; 880 } 881 882 static 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 } 926 927 static 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 } 944 945 static 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 if (instance->driver->atm_start && ((ret = instance->driver->atm_start(instance, atm_dev)) < 0)) { 970 atm_err(instance, "%s: atm_start failed: %d!\n", __func__, ret); 971 goto fail; 972 } 973 974 usbatm_get_instance(instance); /* dropped in usbatm_atm_dev_close */ 975 976 /* ready for ATM callbacks */ 977 mb(); 978 atm_dev->dev_data = instance; 979 980 /* submit all rx URBs */ 981 for (i = 0; i < num_rcv_urbs; i++) 982 usbatm_submit_urb(instance->urbs[i]); 983 984 return 0; 985 986 fail: 987 instance->atm_dev = NULL; 988 atm_dev_deregister(atm_dev); /* usbatm_atm_dev_close will eventually be called */ 989 return ret; 990 } 991 992 993 /********** 994 ** USB ** 995 **********/ 996 997 static int usbatm_do_heavy_init(void *arg) 998 { 999 struct usbatm_data *instance = arg; 1000 int ret; 1001 1002 daemonize(instance->driver->driver_name); 1003 allow_signal(SIGTERM); 1004 1005 complete(&instance->thread_started); 1006 1007 ret = instance->driver->heavy_init(instance, instance->usb_intf); 1008 1009 if (!ret) 1010 ret = usbatm_atm_init(instance); 1011 1012 mutex_lock(&instance->serialize); 1013 instance->thread_pid = -1; 1014 mutex_unlock(&instance->serialize); 1015 1016 complete_and_exit(&instance->thread_exited, ret); 1017 } 1018 1019 static int usbatm_heavy_init(struct usbatm_data *instance) 1020 { 1021 int ret = kernel_thread(usbatm_do_heavy_init, instance, CLONE_KERNEL); 1022 1023 if (ret < 0) { 1024 usb_err(instance, "%s: failed to create kernel_thread (%d)!\n", __func__, ret); 1025 return ret; 1026 } 1027 1028 mutex_lock(&instance->serialize); 1029 instance->thread_pid = ret; 1030 mutex_unlock(&instance->serialize); 1031 1032 wait_for_completion(&instance->thread_started); 1033 1034 return 0; 1035 } 1036 1037 static void usbatm_tasklet_schedule(unsigned long data) 1038 { 1039 tasklet_schedule((struct tasklet_struct *) data); 1040 } 1041 1042 static void usbatm_init_channel(struct usbatm_channel *channel) 1043 { 1044 spin_lock_init(&channel->lock); 1045 INIT_LIST_HEAD(&channel->list); 1046 channel->delay.function = usbatm_tasklet_schedule; 1047 channel->delay.data = (unsigned long) &channel->tasklet; 1048 init_timer(&channel->delay); 1049 } 1050 1051 int usbatm_usb_probe(struct usb_interface *intf, const struct usb_device_id *id, 1052 struct usbatm_driver *driver) 1053 { 1054 struct device *dev = &intf->dev; 1055 struct usb_device *usb_dev = interface_to_usbdev(intf); 1056 struct usbatm_data *instance; 1057 char *buf; 1058 int error = -ENOMEM; 1059 int i, length; 1060 unsigned int maxpacket, num_packets; 1061 1062 dev_dbg(dev, "%s: trying driver %s with vendor=%04x, product=%04x, ifnum %2d\n", 1063 __func__, driver->driver_name, 1064 le16_to_cpu(usb_dev->descriptor.idVendor), 1065 le16_to_cpu(usb_dev->descriptor.idProduct), 1066 intf->altsetting->desc.bInterfaceNumber); 1067 1068 /* instance init */ 1069 instance = kzalloc(sizeof(*instance) + sizeof(struct urb *) * (num_rcv_urbs + num_snd_urbs), GFP_KERNEL); 1070 if (!instance) { 1071 dev_err(dev, "%s: no memory for instance data!\n", __func__); 1072 return -ENOMEM; 1073 } 1074 1075 /* public fields */ 1076 1077 instance->driver = driver; 1078 snprintf(instance->driver_name, sizeof(instance->driver_name), driver->driver_name); 1079 1080 instance->usb_dev = usb_dev; 1081 instance->usb_intf = intf; 1082 1083 buf = instance->description; 1084 length = sizeof(instance->description); 1085 1086 if ((i = usb_string(usb_dev, usb_dev->descriptor.iProduct, buf, length)) < 0) 1087 goto bind; 1088 1089 buf += i; 1090 length -= i; 1091 1092 i = scnprintf(buf, length, " ("); 1093 buf += i; 1094 length -= i; 1095 1096 if (length <= 0 || (i = usb_make_path(usb_dev, buf, length)) < 0) 1097 goto bind; 1098 1099 buf += i; 1100 length -= i; 1101 1102 snprintf(buf, length, ")"); 1103 1104 bind: 1105 if (driver->bind && (error = driver->bind(instance, intf, id)) < 0) { 1106 dev_err(dev, "%s: bind failed: %d!\n", __func__, error); 1107 goto fail_free; 1108 } 1109 1110 /* private fields */ 1111 1112 kref_init(&instance->refcount); /* dropped in usbatm_usb_disconnect */ 1113 mutex_init(&instance->serialize); 1114 1115 instance->thread_pid = -1; 1116 init_completion(&instance->thread_started); 1117 init_completion(&instance->thread_exited); 1118 1119 INIT_LIST_HEAD(&instance->vcc_list); 1120 skb_queue_head_init(&instance->sndqueue); 1121 1122 usbatm_init_channel(&instance->rx_channel); 1123 usbatm_init_channel(&instance->tx_channel); 1124 tasklet_init(&instance->rx_channel.tasklet, usbatm_rx_process, (unsigned long)instance); 1125 tasklet_init(&instance->tx_channel.tasklet, usbatm_tx_process, (unsigned long)instance); 1126 instance->rx_channel.stride = ATM_CELL_SIZE + driver->rx_padding; 1127 instance->tx_channel.stride = ATM_CELL_SIZE + driver->tx_padding; 1128 instance->rx_channel.usbatm = instance->tx_channel.usbatm = instance; 1129 1130 if ((instance->flags & UDSL_USE_ISOC) && driver->isoc_in) 1131 instance->rx_channel.endpoint = usb_rcvisocpipe(usb_dev, driver->isoc_in); 1132 else 1133 instance->rx_channel.endpoint = usb_rcvbulkpipe(usb_dev, driver->bulk_in); 1134 1135 instance->tx_channel.endpoint = usb_sndbulkpipe(usb_dev, driver->bulk_out); 1136 1137 /* tx buffer size must be a positive multiple of the stride */ 1138 instance->tx_channel.buf_size = max (instance->tx_channel.stride, 1139 snd_buf_bytes - (snd_buf_bytes % instance->tx_channel.stride)); 1140 1141 /* rx buffer size must be a positive multiple of the endpoint maxpacket */ 1142 maxpacket = usb_maxpacket(usb_dev, instance->rx_channel.endpoint, 0); 1143 1144 if ((maxpacket < 1) || (maxpacket > UDSL_MAX_BUF_SIZE)) { 1145 dev_err(dev, "%s: invalid endpoint %02x!\n", __func__, 1146 usb_pipeendpoint(instance->rx_channel.endpoint)); 1147 error = -EINVAL; 1148 goto fail_unbind; 1149 } 1150 1151 num_packets = max (1U, (rcv_buf_bytes + maxpacket / 2) / maxpacket); /* round */ 1152 1153 if (num_packets * maxpacket > UDSL_MAX_BUF_SIZE) 1154 num_packets--; 1155 1156 instance->rx_channel.buf_size = num_packets * maxpacket; 1157 instance->rx_channel.packet_size = maxpacket; 1158 1159 #ifdef DEBUG 1160 for (i = 0; i < 2; i++) { 1161 struct usbatm_channel *channel = i ? 1162 &instance->tx_channel : &instance->rx_channel; 1163 1164 dev_dbg(dev, "%s: using %d byte buffer for %s channel 0x%p\n", __func__, channel->buf_size, i ? "tx" : "rx", channel); 1165 } 1166 #endif 1167 1168 /* initialize urbs */ 1169 1170 for (i = 0; i < num_rcv_urbs + num_snd_urbs; i++) { 1171 u8 *buffer; 1172 struct usbatm_channel *channel = i < num_rcv_urbs ? 1173 &instance->rx_channel : &instance->tx_channel; 1174 struct urb *urb; 1175 unsigned int iso_packets = usb_pipeisoc(channel->endpoint) ? channel->buf_size / channel->packet_size : 0; 1176 1177 UDSL_ASSERT(!usb_pipeisoc(channel->endpoint) || usb_pipein(channel->endpoint)); 1178 1179 urb = usb_alloc_urb(iso_packets, GFP_KERNEL); 1180 if (!urb) { 1181 dev_err(dev, "%s: no memory for urb %d!\n", __func__, i); 1182 error = -ENOMEM; 1183 goto fail_unbind; 1184 } 1185 1186 instance->urbs[i] = urb; 1187 1188 /* zero the tx padding to avoid leaking information */ 1189 buffer = kzalloc(channel->buf_size, GFP_KERNEL); 1190 if (!buffer) { 1191 dev_err(dev, "%s: no memory for buffer %d!\n", __func__, i); 1192 error = -ENOMEM; 1193 goto fail_unbind; 1194 } 1195 1196 usb_fill_bulk_urb(urb, instance->usb_dev, channel->endpoint, 1197 buffer, channel->buf_size, usbatm_complete, channel); 1198 if (iso_packets) { 1199 int j; 1200 urb->interval = 1; 1201 urb->transfer_flags = URB_ISO_ASAP; 1202 urb->number_of_packets = iso_packets; 1203 for (j = 0; j < iso_packets; j++) { 1204 urb->iso_frame_desc[j].offset = channel->packet_size * j; 1205 urb->iso_frame_desc[j].length = channel->packet_size; 1206 } 1207 } 1208 1209 /* put all tx URBs on the list of spares */ 1210 if (i >= num_rcv_urbs) 1211 list_add_tail(&urb->urb_list, &channel->list); 1212 1213 vdbg("%s: alloced buffer 0x%p buf size %u urb 0x%p", 1214 __func__, urb->transfer_buffer, urb->transfer_buffer_length, urb); 1215 } 1216 1217 instance->cached_vpi = ATM_VPI_UNSPEC; 1218 instance->cached_vci = ATM_VCI_UNSPEC; 1219 instance->cell_buf = kmalloc(instance->rx_channel.stride, GFP_KERNEL); 1220 1221 if (!instance->cell_buf) { 1222 dev_err(dev, "%s: no memory for cell buffer!\n", __func__); 1223 error = -ENOMEM; 1224 goto fail_unbind; 1225 } 1226 1227 if (!(instance->flags & UDSL_SKIP_HEAVY_INIT) && driver->heavy_init) { 1228 error = usbatm_heavy_init(instance); 1229 } else { 1230 complete(&instance->thread_exited); /* pretend that heavy_init was run */ 1231 error = usbatm_atm_init(instance); 1232 } 1233 1234 if (error < 0) 1235 goto fail_unbind; 1236 1237 usb_get_dev(usb_dev); 1238 usb_set_intfdata(intf, instance); 1239 1240 return 0; 1241 1242 fail_unbind: 1243 if (instance->driver->unbind) 1244 instance->driver->unbind(instance, intf); 1245 fail_free: 1246 kfree(instance->cell_buf); 1247 1248 for (i = 0; i < num_rcv_urbs + num_snd_urbs; i++) { 1249 if (instance->urbs[i]) 1250 kfree(instance->urbs[i]->transfer_buffer); 1251 usb_free_urb(instance->urbs[i]); 1252 } 1253 1254 kfree (instance); 1255 1256 return error; 1257 } 1258 EXPORT_SYMBOL_GPL(usbatm_usb_probe); 1259 1260 void usbatm_usb_disconnect(struct usb_interface *intf) 1261 { 1262 struct device *dev = &intf->dev; 1263 struct usbatm_data *instance = usb_get_intfdata(intf); 1264 struct usbatm_vcc_data *vcc_data; 1265 int i; 1266 1267 dev_dbg(dev, "%s entered\n", __func__); 1268 1269 if (!instance) { 1270 dev_dbg(dev, "%s: NULL instance!\n", __func__); 1271 return; 1272 } 1273 1274 usb_set_intfdata(intf, NULL); 1275 1276 mutex_lock(&instance->serialize); 1277 instance->disconnected = 1; 1278 if (instance->thread_pid >= 0) 1279 kill_proc(instance->thread_pid, SIGTERM, 1); 1280 mutex_unlock(&instance->serialize); 1281 1282 wait_for_completion(&instance->thread_exited); 1283 1284 mutex_lock(&instance->serialize); 1285 list_for_each_entry(vcc_data, &instance->vcc_list, list) 1286 vcc_release_async(vcc_data->vcc, -EPIPE); 1287 mutex_unlock(&instance->serialize); 1288 1289 tasklet_disable(&instance->rx_channel.tasklet); 1290 tasklet_disable(&instance->tx_channel.tasklet); 1291 1292 for (i = 0; i < num_rcv_urbs + num_snd_urbs; i++) 1293 usb_kill_urb(instance->urbs[i]); 1294 1295 del_timer_sync(&instance->rx_channel.delay); 1296 del_timer_sync(&instance->tx_channel.delay); 1297 1298 /* turn usbatm_[rt]x_process into something close to a no-op */ 1299 /* no need to take the spinlock */ 1300 INIT_LIST_HEAD(&instance->rx_channel.list); 1301 INIT_LIST_HEAD(&instance->tx_channel.list); 1302 1303 tasklet_enable(&instance->rx_channel.tasklet); 1304 tasklet_enable(&instance->tx_channel.tasklet); 1305 1306 if (instance->atm_dev && instance->driver->atm_stop) 1307 instance->driver->atm_stop(instance, instance->atm_dev); 1308 1309 if (instance->driver->unbind) 1310 instance->driver->unbind(instance, intf); 1311 1312 instance->driver_data = NULL; 1313 1314 for (i = 0; i < num_rcv_urbs + num_snd_urbs; i++) { 1315 kfree(instance->urbs[i]->transfer_buffer); 1316 usb_free_urb(instance->urbs[i]); 1317 } 1318 1319 kfree(instance->cell_buf); 1320 1321 /* ATM finalize */ 1322 if (instance->atm_dev) 1323 atm_dev_deregister(instance->atm_dev); 1324 1325 usbatm_put_instance(instance); /* taken in usbatm_usb_probe */ 1326 } 1327 EXPORT_SYMBOL_GPL(usbatm_usb_disconnect); 1328 1329 1330 /*********** 1331 ** init ** 1332 ***********/ 1333 1334 static int __init usbatm_usb_init(void) 1335 { 1336 dbg("%s: driver version %s", __func__, DRIVER_VERSION); 1337 1338 if (sizeof(struct usbatm_control) > sizeof(((struct sk_buff *) 0)->cb)) { 1339 printk(KERN_ERR "%s unusable with this kernel!\n", usbatm_driver_name); 1340 return -EIO; 1341 } 1342 1343 if ((num_rcv_urbs > UDSL_MAX_RCV_URBS) 1344 || (num_snd_urbs > UDSL_MAX_SND_URBS) 1345 || (rcv_buf_bytes < 1) 1346 || (rcv_buf_bytes > UDSL_MAX_BUF_SIZE) 1347 || (snd_buf_bytes < 1) 1348 || (snd_buf_bytes > UDSL_MAX_BUF_SIZE)) 1349 return -EINVAL; 1350 1351 return 0; 1352 } 1353 module_init(usbatm_usb_init); 1354 1355 static void __exit usbatm_usb_exit(void) 1356 { 1357 dbg("%s", __func__); 1358 } 1359 module_exit(usbatm_usb_exit); 1360 1361 MODULE_AUTHOR(DRIVER_AUTHOR); 1362 MODULE_DESCRIPTION(DRIVER_DESC); 1363 MODULE_LICENSE("GPL"); 1364 MODULE_VERSION(DRIVER_VERSION); 1365 1366 /************ 1367 ** debug ** 1368 ************/ 1369 1370 #ifdef VERBOSE_DEBUG 1371 static int usbatm_print_packet(const unsigned char *data, int len) 1372 { 1373 unsigned char buffer[256]; 1374 int i = 0, j = 0; 1375 1376 for (i = 0; i < len;) { 1377 buffer[0] = '\0'; 1378 sprintf(buffer, "%.3d :", i); 1379 for (j = 0; (j < 16) && (i < len); j++, i++) { 1380 sprintf(buffer, "%s %2.2x", buffer, data[i]); 1381 } 1382 dbg("%s", buffer); 1383 } 1384 return i; 1385 } 1386 #endif 1387