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 #include <linux/ratelimit.h> 85 86 #ifdef VERBOSE_DEBUG 87 static int usbatm_print_packet(struct usbatm_data *instance, const unsigned char *data, int len); 88 #define PACKETDEBUG(arg...) usbatm_print_packet(arg) 89 #define vdbg(arg...) dev_dbg(arg) 90 #else 91 #define PACKETDEBUG(arg...) 92 #define vdbg(arg...) 93 #endif 94 95 #define DRIVER_AUTHOR "Johan Verrept, Duncan Sands <duncan.sands@free.fr>" 96 #define DRIVER_VERSION "1.10" 97 #define DRIVER_DESC "Generic USB ATM/DSL I/O, version " DRIVER_VERSION 98 99 static const char usbatm_driver_name[] = "usbatm"; 100 101 #define UDSL_MAX_RCV_URBS 16 102 #define UDSL_MAX_SND_URBS 16 103 #define UDSL_MAX_BUF_SIZE 65536 104 #define UDSL_DEFAULT_RCV_URBS 4 105 #define UDSL_DEFAULT_SND_URBS 4 106 #define UDSL_DEFAULT_RCV_BUF_SIZE 3392 /* 64 * ATM_CELL_SIZE */ 107 #define UDSL_DEFAULT_SND_BUF_SIZE 3392 /* 64 * ATM_CELL_SIZE */ 108 109 #define ATM_CELL_HEADER (ATM_CELL_SIZE - ATM_CELL_PAYLOAD) 110 111 #define THROTTLE_MSECS 100 /* delay to recover processing after urb submission fails */ 112 113 static unsigned int num_rcv_urbs = UDSL_DEFAULT_RCV_URBS; 114 static unsigned int num_snd_urbs = UDSL_DEFAULT_SND_URBS; 115 static unsigned int rcv_buf_bytes = UDSL_DEFAULT_RCV_BUF_SIZE; 116 static unsigned int snd_buf_bytes = UDSL_DEFAULT_SND_BUF_SIZE; 117 118 module_param(num_rcv_urbs, uint, S_IRUGO); 119 MODULE_PARM_DESC(num_rcv_urbs, 120 "Number of urbs used for reception (range: 0-" 121 __MODULE_STRING(UDSL_MAX_RCV_URBS) ", default: " 122 __MODULE_STRING(UDSL_DEFAULT_RCV_URBS) ")"); 123 124 module_param(num_snd_urbs, uint, S_IRUGO); 125 MODULE_PARM_DESC(num_snd_urbs, 126 "Number of urbs used for transmission (range: 0-" 127 __MODULE_STRING(UDSL_MAX_SND_URBS) ", default: " 128 __MODULE_STRING(UDSL_DEFAULT_SND_URBS) ")"); 129 130 module_param(rcv_buf_bytes, uint, S_IRUGO); 131 MODULE_PARM_DESC(rcv_buf_bytes, 132 "Size of the buffers used for reception, in bytes (range: 1-" 133 __MODULE_STRING(UDSL_MAX_BUF_SIZE) ", default: " 134 __MODULE_STRING(UDSL_DEFAULT_RCV_BUF_SIZE) ")"); 135 136 module_param(snd_buf_bytes, uint, S_IRUGO); 137 MODULE_PARM_DESC(snd_buf_bytes, 138 "Size of the buffers used for transmission, in bytes (range: 1-" 139 __MODULE_STRING(UDSL_MAX_BUF_SIZE) ", default: " 140 __MODULE_STRING(UDSL_DEFAULT_SND_BUF_SIZE) ")"); 141 142 143 /* receive */ 144 145 struct usbatm_vcc_data { 146 /* vpi/vci lookup */ 147 struct list_head list; 148 short vpi; 149 int vci; 150 struct atm_vcc *vcc; 151 152 /* raw cell reassembly */ 153 struct sk_buff *sarb; 154 }; 155 156 157 /* send */ 158 159 struct usbatm_control { 160 struct atm_skb_data atm; 161 u32 len; 162 u32 crc; 163 }; 164 165 #define UDSL_SKB(x) ((struct usbatm_control *)(x)->cb) 166 167 168 /* ATM */ 169 170 static void usbatm_atm_dev_close(struct atm_dev *atm_dev); 171 static int usbatm_atm_open(struct atm_vcc *vcc); 172 static void usbatm_atm_close(struct atm_vcc *vcc); 173 static int usbatm_atm_ioctl(struct atm_dev *atm_dev, unsigned int cmd, void __user * arg); 174 static int usbatm_atm_send(struct atm_vcc *vcc, struct sk_buff *skb); 175 static int usbatm_atm_proc_read(struct atm_dev *atm_dev, loff_t * pos, char *page); 176 177 static struct atmdev_ops usbatm_atm_devops = { 178 .dev_close = usbatm_atm_dev_close, 179 .open = usbatm_atm_open, 180 .close = usbatm_atm_close, 181 .ioctl = usbatm_atm_ioctl, 182 .send = usbatm_atm_send, 183 .proc_read = usbatm_atm_proc_read, 184 .owner = THIS_MODULE, 185 }; 186 187 188 /*********** 189 ** misc ** 190 ***********/ 191 192 static inline unsigned int usbatm_pdu_length(unsigned int length) 193 { 194 length += ATM_CELL_PAYLOAD - 1 + ATM_AAL5_TRAILER; 195 return length - length % ATM_CELL_PAYLOAD; 196 } 197 198 static inline void usbatm_pop(struct atm_vcc *vcc, struct sk_buff *skb) 199 { 200 if (vcc->pop) 201 vcc->pop(vcc, skb); 202 else 203 dev_kfree_skb_any(skb); 204 } 205 206 207 /*********** 208 ** urbs ** 209 ************/ 210 211 static struct urb *usbatm_pop_urb(struct usbatm_channel *channel) 212 { 213 struct urb *urb; 214 215 spin_lock_irq(&channel->lock); 216 if (list_empty(&channel->list)) { 217 spin_unlock_irq(&channel->lock); 218 return NULL; 219 } 220 221 urb = list_entry(channel->list.next, struct urb, urb_list); 222 list_del(&urb->urb_list); 223 spin_unlock_irq(&channel->lock); 224 225 return urb; 226 } 227 228 static int usbatm_submit_urb(struct urb *urb) 229 { 230 struct usbatm_channel *channel = urb->context; 231 int ret; 232 233 /* vdbg("%s: submitting urb 0x%p, size %u", 234 __func__, urb, urb->transfer_buffer_length); */ 235 236 ret = usb_submit_urb(urb, GFP_ATOMIC); 237 if (ret) { 238 if (printk_ratelimit()) 239 atm_warn(channel->usbatm, "%s: urb 0x%p submission failed (%d)!\n", 240 __func__, urb, ret); 241 242 /* consider all errors transient and return the buffer back to the queue */ 243 urb->status = -EAGAIN; 244 spin_lock_irq(&channel->lock); 245 246 /* must add to the front when sending; doesn't matter when receiving */ 247 list_add(&urb->urb_list, &channel->list); 248 249 spin_unlock_irq(&channel->lock); 250 251 /* make sure the channel doesn't stall */ 252 mod_timer(&channel->delay, jiffies + msecs_to_jiffies(THROTTLE_MSECS)); 253 } 254 255 return ret; 256 } 257 258 static void usbatm_complete(struct urb *urb) 259 { 260 struct usbatm_channel *channel = urb->context; 261 unsigned long flags; 262 int status = urb->status; 263 264 /* vdbg("%s: urb 0x%p, status %d, actual_length %d", 265 __func__, urb, status, urb->actual_length); */ 266 267 /* usually in_interrupt(), but not always */ 268 spin_lock_irqsave(&channel->lock, flags); 269 270 /* must add to the back when receiving; doesn't matter when sending */ 271 list_add_tail(&urb->urb_list, &channel->list); 272 273 spin_unlock_irqrestore(&channel->lock, flags); 274 275 if (unlikely(status) && 276 (!(channel->usbatm->flags & UDSL_IGNORE_EILSEQ) || 277 status != -EILSEQ)) { 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(&instance->usb_intf->dev, "%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(&instance->usb_intf->dev, 385 "%s: got packet (length: %u, pdu_length: %u, vcc: 0x%p)", 386 __func__, length, pdu_length, vcc); 387 388 if (!(skb = dev_alloc_skb(length))) { 389 if (printk_ratelimit()) 390 atm_err(instance, "%s: no memory for skb (length: %u)!\n", 391 __func__, length); 392 atomic_inc(&vcc->stats->rx_drop); 393 goto out; 394 } 395 396 vdbg(&instance->usb_intf->dev, 397 "%s: allocated new sk_buff (skb: 0x%p, skb->truesize: %u)", 398 __func__, skb, skb->truesize); 399 400 if (!atm_charge(vcc, skb->truesize)) { 401 atm_rldbg(instance, "%s: failed atm_charge (skb->truesize: %u)!\n", 402 __func__, skb->truesize); 403 dev_kfree_skb_any(skb); 404 goto out; /* atm_charge increments rx_drop */ 405 } 406 407 skb_copy_to_linear_data(skb, 408 skb_tail_pointer(sarb) - pdu_length, 409 length); 410 __skb_put(skb, length); 411 412 vdbg(&instance->usb_intf->dev, 413 "%s: sending skb 0x%p, skb->len %u, skb->truesize %u", 414 __func__, skb, skb->len, skb->truesize); 415 416 PACKETDEBUG(instance, skb->data, skb->len); 417 418 vcc->push(vcc, skb); 419 420 atomic_inc(&vcc->stats->rx); 421 out: 422 skb_trim(sarb, 0); 423 } 424 } 425 426 static void usbatm_extract_cells(struct usbatm_data *instance, 427 unsigned char *source, unsigned int avail_data) 428 { 429 unsigned int stride = instance->rx_channel.stride; 430 unsigned int buf_usage = instance->buf_usage; 431 432 /* extract cells from incoming data, taking into account that 433 * the length of avail data may not be a multiple of stride */ 434 435 if (buf_usage > 0) { 436 /* we have a partially received atm cell */ 437 unsigned char *cell_buf = instance->cell_buf; 438 unsigned int space_left = stride - buf_usage; 439 440 UDSL_ASSERT(instance, buf_usage <= stride); 441 442 if (avail_data >= space_left) { 443 /* add new data and process cell */ 444 memcpy(cell_buf + buf_usage, source, space_left); 445 source += space_left; 446 avail_data -= space_left; 447 usbatm_extract_one_cell(instance, cell_buf); 448 instance->buf_usage = 0; 449 } else { 450 /* not enough data to fill the cell */ 451 memcpy(cell_buf + buf_usage, source, avail_data); 452 instance->buf_usage = buf_usage + avail_data; 453 return; 454 } 455 } 456 457 for (; avail_data >= stride; avail_data -= stride, source += stride) 458 usbatm_extract_one_cell(instance, source); 459 460 if (avail_data > 0) { 461 /* length was not a multiple of stride - 462 * save remaining data for next call */ 463 memcpy(instance->cell_buf, source, avail_data); 464 instance->buf_usage = avail_data; 465 } 466 } 467 468 469 /************* 470 ** encode ** 471 *************/ 472 473 static unsigned int usbatm_write_cells(struct usbatm_data *instance, 474 struct sk_buff *skb, 475 u8 *target, unsigned int avail_space) 476 { 477 struct usbatm_control *ctrl = UDSL_SKB(skb); 478 struct atm_vcc *vcc = ctrl->atm.vcc; 479 unsigned int bytes_written; 480 unsigned int stride = instance->tx_channel.stride; 481 482 vdbg(&instance->usb_intf->dev, "%s: skb->len=%d, avail_space=%u", 483 __func__, skb->len, avail_space); 484 UDSL_ASSERT(instance, !(avail_space % stride)); 485 486 for (bytes_written = 0; bytes_written < avail_space && ctrl->len; 487 bytes_written += stride, target += stride) { 488 unsigned int data_len = min_t(unsigned int, skb->len, ATM_CELL_PAYLOAD); 489 unsigned int left = ATM_CELL_PAYLOAD - data_len; 490 u8 *ptr = target; 491 492 ptr[0] = vcc->vpi >> 4; 493 ptr[1] = (vcc->vpi << 4) | (vcc->vci >> 12); 494 ptr[2] = vcc->vci >> 4; 495 ptr[3] = vcc->vci << 4; 496 ptr[4] = 0xec; 497 ptr += ATM_CELL_HEADER; 498 499 skb_copy_from_linear_data(skb, ptr, data_len); 500 ptr += data_len; 501 __skb_pull(skb, data_len); 502 503 if (!left) 504 continue; 505 506 memset(ptr, 0, left); 507 508 if (left >= ATM_AAL5_TRAILER) { /* trailer will go in this cell */ 509 u8 *trailer = target + ATM_CELL_SIZE - ATM_AAL5_TRAILER; 510 /* trailer[0] = 0; UU = 0 */ 511 /* trailer[1] = 0; CPI = 0 */ 512 trailer[2] = ctrl->len >> 8; 513 trailer[3] = ctrl->len; 514 515 ctrl->crc = ~crc32_be(ctrl->crc, ptr, left - 4); 516 517 trailer[4] = ctrl->crc >> 24; 518 trailer[5] = ctrl->crc >> 16; 519 trailer[6] = ctrl->crc >> 8; 520 trailer[7] = ctrl->crc; 521 522 target[3] |= 0x2; /* adjust PTI */ 523 524 ctrl->len = 0; /* tag this skb finished */ 525 } else 526 ctrl->crc = crc32_be(ctrl->crc, ptr, left); 527 } 528 529 return bytes_written; 530 } 531 532 533 /************** 534 ** receive ** 535 **************/ 536 537 static void usbatm_rx_process(unsigned long data) 538 { 539 struct usbatm_data *instance = (struct usbatm_data *)data; 540 struct urb *urb; 541 542 while ((urb = usbatm_pop_urb(&instance->rx_channel))) { 543 vdbg(&instance->usb_intf->dev, 544 "%s: processing urb 0x%p", __func__, urb); 545 546 if (usb_pipeisoc(urb->pipe)) { 547 unsigned char *merge_start = NULL; 548 unsigned int merge_length = 0; 549 const unsigned int packet_size = instance->rx_channel.packet_size; 550 int i; 551 552 for (i = 0; i < urb->number_of_packets; i++) { 553 if (!urb->iso_frame_desc[i].status) { 554 unsigned int actual_length = urb->iso_frame_desc[i].actual_length; 555 556 UDSL_ASSERT(instance, actual_length <= packet_size); 557 558 if (!merge_length) 559 merge_start = (unsigned char *)urb->transfer_buffer + urb->iso_frame_desc[i].offset; 560 merge_length += actual_length; 561 if (merge_length && (actual_length < packet_size)) { 562 usbatm_extract_cells(instance, merge_start, merge_length); 563 merge_length = 0; 564 } 565 } else { 566 atm_rldbg(instance, "%s: status %d in frame %d!\n", __func__, urb->status, i); 567 if (merge_length) 568 usbatm_extract_cells(instance, merge_start, merge_length); 569 merge_length = 0; 570 instance->buf_usage = 0; 571 } 572 } 573 574 if (merge_length) 575 usbatm_extract_cells(instance, merge_start, merge_length); 576 } else 577 if (!urb->status) 578 usbatm_extract_cells(instance, urb->transfer_buffer, urb->actual_length); 579 else 580 instance->buf_usage = 0; 581 582 if (usbatm_submit_urb(urb)) 583 return; 584 } 585 } 586 587 588 /*********** 589 ** send ** 590 ***********/ 591 592 static void usbatm_tx_process(unsigned long data) 593 { 594 struct usbatm_data *instance = (struct usbatm_data *)data; 595 struct sk_buff *skb = instance->current_skb; 596 struct urb *urb = NULL; 597 const unsigned int buf_size = instance->tx_channel.buf_size; 598 unsigned int bytes_written = 0; 599 u8 *buffer = NULL; 600 601 if (!skb) 602 skb = skb_dequeue(&instance->sndqueue); 603 604 while (skb) { 605 if (!urb) { 606 urb = usbatm_pop_urb(&instance->tx_channel); 607 if (!urb) 608 break; /* no more senders */ 609 buffer = urb->transfer_buffer; 610 bytes_written = (urb->status == -EAGAIN) ? 611 urb->transfer_buffer_length : 0; 612 } 613 614 bytes_written += usbatm_write_cells(instance, skb, 615 buffer + bytes_written, 616 buf_size - bytes_written); 617 618 vdbg(&instance->usb_intf->dev, 619 "%s: wrote %u bytes from skb 0x%p to urb 0x%p", 620 __func__, bytes_written, skb, urb); 621 622 if (!UDSL_SKB(skb)->len) { 623 struct atm_vcc *vcc = UDSL_SKB(skb)->atm.vcc; 624 625 usbatm_pop(vcc, skb); 626 atomic_inc(&vcc->stats->tx); 627 628 skb = skb_dequeue(&instance->sndqueue); 629 } 630 631 if (bytes_written == buf_size || (!skb && bytes_written)) { 632 urb->transfer_buffer_length = bytes_written; 633 634 if (usbatm_submit_urb(urb)) 635 break; 636 urb = NULL; 637 } 638 } 639 640 instance->current_skb = skb; 641 } 642 643 static void usbatm_cancel_send(struct usbatm_data *instance, 644 struct atm_vcc *vcc) 645 { 646 struct sk_buff *skb, *n; 647 648 atm_dbg(instance, "%s entered\n", __func__); 649 spin_lock_irq(&instance->sndqueue.lock); 650 skb_queue_walk_safe(&instance->sndqueue, skb, n) { 651 if (UDSL_SKB(skb)->atm.vcc == vcc) { 652 atm_dbg(instance, "%s: popping skb 0x%p\n", __func__, skb); 653 __skb_unlink(skb, &instance->sndqueue); 654 usbatm_pop(vcc, skb); 655 } 656 } 657 spin_unlock_irq(&instance->sndqueue.lock); 658 659 tasklet_disable(&instance->tx_channel.tasklet); 660 if ((skb = instance->current_skb) && (UDSL_SKB(skb)->atm.vcc == vcc)) { 661 atm_dbg(instance, "%s: popping current skb (0x%p)\n", __func__, skb); 662 instance->current_skb = NULL; 663 usbatm_pop(vcc, skb); 664 } 665 tasklet_enable(&instance->tx_channel.tasklet); 666 atm_dbg(instance, "%s done\n", __func__); 667 } 668 669 static int usbatm_atm_send(struct atm_vcc *vcc, struct sk_buff *skb) 670 { 671 struct usbatm_data *instance = vcc->dev->dev_data; 672 struct usbatm_control *ctrl = UDSL_SKB(skb); 673 int err; 674 675 vdbg(&instance->usb_intf->dev, "%s called (skb 0x%p, len %u)", __func__, 676 skb, skb->len); 677 678 /* racy disconnection check - fine */ 679 if (!instance || instance->disconnected) { 680 #ifdef DEBUG 681 printk_ratelimited(KERN_DEBUG "%s: %s!\n", __func__, instance ? "disconnected" : "NULL instance"); 682 #endif 683 err = -ENODEV; 684 goto fail; 685 } 686 687 if (vcc->qos.aal != ATM_AAL5) { 688 atm_rldbg(instance, "%s: unsupported ATM type %d!\n", __func__, vcc->qos.aal); 689 err = -EINVAL; 690 goto fail; 691 } 692 693 if (skb->len > ATM_MAX_AAL5_PDU) { 694 atm_rldbg(instance, "%s: packet too long (%d vs %d)!\n", 695 __func__, skb->len, ATM_MAX_AAL5_PDU); 696 err = -EINVAL; 697 goto fail; 698 } 699 700 PACKETDEBUG(instance, skb->data, skb->len); 701 702 /* initialize the control block */ 703 ctrl->atm.vcc = vcc; 704 ctrl->len = skb->len; 705 ctrl->crc = crc32_be(~0, skb->data, skb->len); 706 707 skb_queue_tail(&instance->sndqueue, skb); 708 tasklet_schedule(&instance->tx_channel.tasklet); 709 710 return 0; 711 712 fail: 713 usbatm_pop(vcc, skb); 714 return err; 715 } 716 717 718 /******************** 719 ** bean counting ** 720 ********************/ 721 722 static void usbatm_destroy_instance(struct kref *kref) 723 { 724 struct usbatm_data *instance = container_of(kref, struct usbatm_data, refcount); 725 726 usb_dbg(instance, "%s\n", __func__); 727 728 tasklet_kill(&instance->rx_channel.tasklet); 729 tasklet_kill(&instance->tx_channel.tasklet); 730 usb_put_dev(instance->usb_dev); 731 kfree(instance); 732 } 733 734 static void usbatm_get_instance(struct usbatm_data *instance) 735 { 736 usb_dbg(instance, "%s\n", __func__); 737 738 kref_get(&instance->refcount); 739 } 740 741 static void usbatm_put_instance(struct usbatm_data *instance) 742 { 743 usb_dbg(instance, "%s\n", __func__); 744 745 kref_put(&instance->refcount, usbatm_destroy_instance); 746 } 747 748 749 /********** 750 ** ATM ** 751 **********/ 752 753 static void usbatm_atm_dev_close(struct atm_dev *atm_dev) 754 { 755 struct usbatm_data *instance = atm_dev->dev_data; 756 757 if (!instance) 758 return; 759 760 usb_dbg(instance, "%s\n", __func__); 761 atm_dev->dev_data = NULL; /* catch bugs */ 762 usbatm_put_instance(instance); /* taken in usbatm_atm_init */ 763 } 764 765 static int usbatm_atm_proc_read(struct atm_dev *atm_dev, loff_t * pos, char *page) 766 { 767 struct usbatm_data *instance = atm_dev->dev_data; 768 int left = *pos; 769 770 if (!instance) 771 return -ENODEV; 772 773 if (!left--) 774 return sprintf(page, "%s\n", instance->description); 775 776 if (!left--) 777 return sprintf(page, "MAC: %pM\n", atm_dev->esi); 778 779 if (!left--) 780 return sprintf(page, 781 "AAL5: tx %d ( %d err ), rx %d ( %d err, %d drop )\n", 782 atomic_read(&atm_dev->stats.aal5.tx), 783 atomic_read(&atm_dev->stats.aal5.tx_err), 784 atomic_read(&atm_dev->stats.aal5.rx), 785 atomic_read(&atm_dev->stats.aal5.rx_err), 786 atomic_read(&atm_dev->stats.aal5.rx_drop)); 787 788 if (!left--) { 789 if (instance->disconnected) 790 return sprintf(page, "Disconnected\n"); 791 else 792 switch (atm_dev->signal) { 793 case ATM_PHY_SIG_FOUND: 794 return sprintf(page, "Line up\n"); 795 case ATM_PHY_SIG_LOST: 796 return sprintf(page, "Line down\n"); 797 default: 798 return sprintf(page, "Line state unknown\n"); 799 } 800 } 801 802 return 0; 803 } 804 805 static int usbatm_atm_open(struct atm_vcc *vcc) 806 { 807 struct usbatm_data *instance = vcc->dev->dev_data; 808 struct usbatm_vcc_data *new = NULL; 809 int ret; 810 int vci = vcc->vci; 811 short vpi = vcc->vpi; 812 813 if (!instance) 814 return -ENODEV; 815 816 atm_dbg(instance, "%s: vpi %hd, vci %d\n", __func__, vpi, vci); 817 818 /* only support AAL5 */ 819 if ((vcc->qos.aal != ATM_AAL5)) { 820 atm_warn(instance, "%s: unsupported ATM type %d!\n", __func__, vcc->qos.aal); 821 return -EINVAL; 822 } 823 824 /* sanity checks */ 825 if ((vcc->qos.rxtp.max_sdu < 0) || (vcc->qos.rxtp.max_sdu > ATM_MAX_AAL5_PDU)) { 826 atm_dbg(instance, "%s: max_sdu %d out of range!\n", __func__, vcc->qos.rxtp.max_sdu); 827 return -EINVAL; 828 } 829 830 mutex_lock(&instance->serialize); /* vs self, usbatm_atm_close, usbatm_usb_disconnect */ 831 832 if (instance->disconnected) { 833 atm_dbg(instance, "%s: disconnected!\n", __func__); 834 ret = -ENODEV; 835 goto fail; 836 } 837 838 if (usbatm_find_vcc(instance, vpi, vci)) { 839 atm_dbg(instance, "%s: %hd/%d already in use!\n", __func__, vpi, vci); 840 ret = -EADDRINUSE; 841 goto fail; 842 } 843 844 if (!(new = kzalloc(sizeof(struct usbatm_vcc_data), GFP_KERNEL))) { 845 atm_err(instance, "%s: no memory for vcc_data!\n", __func__); 846 ret = -ENOMEM; 847 goto fail; 848 } 849 850 new->vcc = vcc; 851 new->vpi = vpi; 852 new->vci = vci; 853 854 new->sarb = alloc_skb(usbatm_pdu_length(vcc->qos.rxtp.max_sdu), GFP_KERNEL); 855 if (!new->sarb) { 856 atm_err(instance, "%s: no memory for SAR buffer!\n", __func__); 857 ret = -ENOMEM; 858 goto fail; 859 } 860 861 vcc->dev_data = new; 862 863 tasklet_disable(&instance->rx_channel.tasklet); 864 instance->cached_vcc = new; 865 instance->cached_vpi = vpi; 866 instance->cached_vci = vci; 867 list_add(&new->list, &instance->vcc_list); 868 tasklet_enable(&instance->rx_channel.tasklet); 869 870 set_bit(ATM_VF_ADDR, &vcc->flags); 871 set_bit(ATM_VF_PARTIAL, &vcc->flags); 872 set_bit(ATM_VF_READY, &vcc->flags); 873 874 mutex_unlock(&instance->serialize); 875 876 atm_dbg(instance, "%s: allocated vcc data 0x%p\n", __func__, new); 877 878 return 0; 879 880 fail: 881 kfree(new); 882 mutex_unlock(&instance->serialize); 883 return ret; 884 } 885 886 static void usbatm_atm_close(struct atm_vcc *vcc) 887 { 888 struct usbatm_data *instance = vcc->dev->dev_data; 889 struct usbatm_vcc_data *vcc_data = vcc->dev_data; 890 891 if (!instance || !vcc_data) 892 return; 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 return -ENODEV; 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, 955 &instance->usb_intf->dev, &usbatm_atm_devops, 956 -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 if (instance->driver->atm_start && ((ret = instance->driver->atm_start(instance, atm_dev)) < 0)) { 972 atm_err(instance, "%s: atm_start failed: %d!\n", __func__, ret); 973 goto fail; 974 } 975 976 usbatm_get_instance(instance); /* dropped in usbatm_atm_dev_close */ 977 978 /* ready for ATM callbacks */ 979 mb(); 980 atm_dev->dev_data = instance; 981 982 /* submit all rx URBs */ 983 for (i = 0; i < num_rcv_urbs; i++) 984 usbatm_submit_urb(instance->urbs[i]); 985 986 return 0; 987 988 fail: 989 instance->atm_dev = NULL; 990 atm_dev_deregister(atm_dev); /* usbatm_atm_dev_close will eventually be called */ 991 return ret; 992 } 993 994 995 /********** 996 ** USB ** 997 **********/ 998 999 static int usbatm_do_heavy_init(void *arg) 1000 { 1001 struct usbatm_data *instance = arg; 1002 int ret; 1003 1004 allow_signal(SIGTERM); 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 = NULL; 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 struct task_struct *t; 1022 1023 t = kthread_create(usbatm_do_heavy_init, instance, 1024 instance->driver->driver_name); 1025 if (IS_ERR(t)) { 1026 usb_err(instance, "%s: failed to create kernel_thread (%ld)!\n", 1027 __func__, PTR_ERR(t)); 1028 return PTR_ERR(t); 1029 } 1030 1031 instance->thread = t; 1032 wake_up_process(t); 1033 wait_for_completion(&instance->thread_started); 1034 1035 return 0; 1036 } 1037 1038 static void usbatm_tasklet_schedule(unsigned long data) 1039 { 1040 tasklet_schedule((struct tasklet_struct *) data); 1041 } 1042 1043 static void usbatm_init_channel(struct usbatm_channel *channel) 1044 { 1045 spin_lock_init(&channel->lock); 1046 INIT_LIST_HEAD(&channel->list); 1047 channel->delay.function = usbatm_tasklet_schedule; 1048 channel->delay.data = (unsigned long) &channel->tasklet; 1049 init_timer(&channel->delay); 1050 } 1051 1052 int usbatm_usb_probe(struct usb_interface *intf, const struct usb_device_id *id, 1053 struct usbatm_driver *driver) 1054 { 1055 struct device *dev = &intf->dev; 1056 struct usb_device *usb_dev = interface_to_usbdev(intf); 1057 struct usbatm_data *instance; 1058 char *buf; 1059 int error = -ENOMEM; 1060 int i, length; 1061 unsigned int maxpacket, num_packets; 1062 1063 dev_dbg(dev, "%s: trying driver %s with vendor=%04x, product=%04x, ifnum %2d\n", 1064 __func__, driver->driver_name, 1065 le16_to_cpu(usb_dev->descriptor.idVendor), 1066 le16_to_cpu(usb_dev->descriptor.idProduct), 1067 intf->altsetting->desc.bInterfaceNumber); 1068 1069 /* instance init */ 1070 instance = kzalloc(sizeof(*instance) + sizeof(struct urb *) * (num_rcv_urbs + num_snd_urbs), GFP_KERNEL); 1071 if (!instance) { 1072 dev_err(dev, "%s: no memory for instance data!\n", __func__); 1073 return -ENOMEM; 1074 } 1075 1076 /* public fields */ 1077 1078 instance->driver = driver; 1079 snprintf(instance->driver_name, sizeof(instance->driver_name), driver->driver_name); 1080 1081 instance->usb_dev = usb_dev; 1082 instance->usb_intf = intf; 1083 1084 buf = instance->description; 1085 length = sizeof(instance->description); 1086 1087 if ((i = usb_string(usb_dev, usb_dev->descriptor.iProduct, buf, length)) < 0) 1088 goto bind; 1089 1090 buf += i; 1091 length -= i; 1092 1093 i = scnprintf(buf, length, " ("); 1094 buf += i; 1095 length -= i; 1096 1097 if (length <= 0 || (i = usb_make_path(usb_dev, buf, length)) < 0) 1098 goto bind; 1099 1100 buf += i; 1101 length -= i; 1102 1103 snprintf(buf, length, ")"); 1104 1105 bind: 1106 if (driver->bind && (error = driver->bind(instance, intf, id)) < 0) { 1107 dev_err(dev, "%s: bind failed: %d!\n", __func__, error); 1108 goto fail_free; 1109 } 1110 1111 /* private fields */ 1112 1113 kref_init(&instance->refcount); /* dropped in usbatm_usb_disconnect */ 1114 mutex_init(&instance->serialize); 1115 1116 instance->thread = NULL; 1117 init_completion(&instance->thread_started); 1118 init_completion(&instance->thread_exited); 1119 1120 INIT_LIST_HEAD(&instance->vcc_list); 1121 skb_queue_head_init(&instance->sndqueue); 1122 1123 usbatm_init_channel(&instance->rx_channel); 1124 usbatm_init_channel(&instance->tx_channel); 1125 tasklet_init(&instance->rx_channel.tasklet, usbatm_rx_process, (unsigned long)instance); 1126 tasklet_init(&instance->tx_channel.tasklet, usbatm_tx_process, (unsigned long)instance); 1127 instance->rx_channel.stride = ATM_CELL_SIZE + driver->rx_padding; 1128 instance->tx_channel.stride = ATM_CELL_SIZE + driver->tx_padding; 1129 instance->rx_channel.usbatm = instance->tx_channel.usbatm = instance; 1130 1131 if ((instance->flags & UDSL_USE_ISOC) && driver->isoc_in) 1132 instance->rx_channel.endpoint = usb_rcvisocpipe(usb_dev, driver->isoc_in); 1133 else 1134 instance->rx_channel.endpoint = usb_rcvbulkpipe(usb_dev, driver->bulk_in); 1135 1136 instance->tx_channel.endpoint = usb_sndbulkpipe(usb_dev, driver->bulk_out); 1137 1138 /* tx buffer size must be a positive multiple of the stride */ 1139 instance->tx_channel.buf_size = max(instance->tx_channel.stride, 1140 snd_buf_bytes - (snd_buf_bytes % instance->tx_channel.stride)); 1141 1142 /* rx buffer size must be a positive multiple of the endpoint maxpacket */ 1143 maxpacket = usb_maxpacket(usb_dev, instance->rx_channel.endpoint, 0); 1144 1145 if ((maxpacket < 1) || (maxpacket > UDSL_MAX_BUF_SIZE)) { 1146 dev_err(dev, "%s: invalid endpoint %02x!\n", __func__, 1147 usb_pipeendpoint(instance->rx_channel.endpoint)); 1148 error = -EINVAL; 1149 goto fail_unbind; 1150 } 1151 1152 num_packets = max(1U, (rcv_buf_bytes + maxpacket / 2) / maxpacket); /* round */ 1153 1154 if (num_packets * maxpacket > UDSL_MAX_BUF_SIZE) 1155 num_packets--; 1156 1157 instance->rx_channel.buf_size = num_packets * maxpacket; 1158 instance->rx_channel.packet_size = maxpacket; 1159 1160 #ifdef DEBUG 1161 for (i = 0; i < 2; i++) { 1162 struct usbatm_channel *channel = i ? 1163 &instance->tx_channel : &instance->rx_channel; 1164 1165 dev_dbg(dev, "%s: using %d byte buffer for %s channel 0x%p\n", __func__, channel->buf_size, i ? "tx" : "rx", channel); 1166 } 1167 #endif 1168 1169 /* initialize urbs */ 1170 1171 for (i = 0; i < num_rcv_urbs + num_snd_urbs; i++) { 1172 u8 *buffer; 1173 struct usbatm_channel *channel = i < num_rcv_urbs ? 1174 &instance->rx_channel : &instance->tx_channel; 1175 struct urb *urb; 1176 unsigned int iso_packets = usb_pipeisoc(channel->endpoint) ? channel->buf_size / channel->packet_size : 0; 1177 1178 UDSL_ASSERT(instance, !usb_pipeisoc(channel->endpoint) || usb_pipein(channel->endpoint)); 1179 1180 urb = usb_alloc_urb(iso_packets, GFP_KERNEL); 1181 if (!urb) { 1182 dev_err(dev, "%s: no memory for urb %d!\n", __func__, i); 1183 error = -ENOMEM; 1184 goto fail_unbind; 1185 } 1186 1187 instance->urbs[i] = urb; 1188 1189 /* zero the tx padding to avoid leaking information */ 1190 buffer = kzalloc(channel->buf_size, GFP_KERNEL); 1191 if (!buffer) { 1192 dev_err(dev, "%s: no memory for buffer %d!\n", __func__, i); 1193 error = -ENOMEM; 1194 goto fail_unbind; 1195 } 1196 1197 usb_fill_bulk_urb(urb, instance->usb_dev, channel->endpoint, 1198 buffer, channel->buf_size, usbatm_complete, channel); 1199 if (iso_packets) { 1200 int j; 1201 urb->interval = 1; 1202 urb->transfer_flags = URB_ISO_ASAP; 1203 urb->number_of_packets = iso_packets; 1204 for (j = 0; j < iso_packets; j++) { 1205 urb->iso_frame_desc[j].offset = channel->packet_size * j; 1206 urb->iso_frame_desc[j].length = channel->packet_size; 1207 } 1208 } 1209 1210 /* put all tx URBs on the list of spares */ 1211 if (i >= num_rcv_urbs) 1212 list_add_tail(&urb->urb_list, &channel->list); 1213 1214 vdbg(&intf->dev, "%s: alloced buffer 0x%p buf size %u urb 0x%p", 1215 __func__, urb->transfer_buffer, urb->transfer_buffer_length, urb); 1216 } 1217 1218 instance->cached_vpi = ATM_VPI_UNSPEC; 1219 instance->cached_vci = ATM_VCI_UNSPEC; 1220 instance->cell_buf = kmalloc(instance->rx_channel.stride, GFP_KERNEL); 1221 1222 if (!instance->cell_buf) { 1223 dev_err(dev, "%s: no memory for cell buffer!\n", __func__); 1224 error = -ENOMEM; 1225 goto fail_unbind; 1226 } 1227 1228 if (!(instance->flags & UDSL_SKIP_HEAVY_INIT) && driver->heavy_init) { 1229 error = usbatm_heavy_init(instance); 1230 } else { 1231 complete(&instance->thread_exited); /* pretend that heavy_init was run */ 1232 error = usbatm_atm_init(instance); 1233 } 1234 1235 if (error < 0) 1236 goto fail_unbind; 1237 1238 usb_get_dev(usb_dev); 1239 usb_set_intfdata(intf, instance); 1240 1241 return 0; 1242 1243 fail_unbind: 1244 if (instance->driver->unbind) 1245 instance->driver->unbind(instance, intf); 1246 fail_free: 1247 kfree(instance->cell_buf); 1248 1249 for (i = 0; i < num_rcv_urbs + num_snd_urbs; i++) { 1250 if (instance->urbs[i]) 1251 kfree(instance->urbs[i]->transfer_buffer); 1252 usb_free_urb(instance->urbs[i]); 1253 } 1254 1255 kfree(instance); 1256 1257 return error; 1258 } 1259 EXPORT_SYMBOL_GPL(usbatm_usb_probe); 1260 1261 void usbatm_usb_disconnect(struct usb_interface *intf) 1262 { 1263 struct device *dev = &intf->dev; 1264 struct usbatm_data *instance = usb_get_intfdata(intf); 1265 struct usbatm_vcc_data *vcc_data; 1266 int i; 1267 1268 dev_dbg(dev, "%s entered\n", __func__); 1269 1270 if (!instance) { 1271 dev_dbg(dev, "%s: NULL instance!\n", __func__); 1272 return; 1273 } 1274 1275 usb_set_intfdata(intf, NULL); 1276 1277 mutex_lock(&instance->serialize); 1278 instance->disconnected = 1; 1279 if (instance->thread != NULL) 1280 send_sig(SIGTERM, instance->thread, 1); 1281 mutex_unlock(&instance->serialize); 1282 1283 wait_for_completion(&instance->thread_exited); 1284 1285 mutex_lock(&instance->serialize); 1286 list_for_each_entry(vcc_data, &instance->vcc_list, list) 1287 vcc_release_async(vcc_data->vcc, -EPIPE); 1288 mutex_unlock(&instance->serialize); 1289 1290 tasklet_disable(&instance->rx_channel.tasklet); 1291 tasklet_disable(&instance->tx_channel.tasklet); 1292 1293 for (i = 0; i < num_rcv_urbs + num_snd_urbs; i++) 1294 usb_kill_urb(instance->urbs[i]); 1295 1296 del_timer_sync(&instance->rx_channel.delay); 1297 del_timer_sync(&instance->tx_channel.delay); 1298 1299 /* turn usbatm_[rt]x_process into something close to a no-op */ 1300 /* no need to take the spinlock */ 1301 INIT_LIST_HEAD(&instance->rx_channel.list); 1302 INIT_LIST_HEAD(&instance->tx_channel.list); 1303 1304 tasklet_enable(&instance->rx_channel.tasklet); 1305 tasklet_enable(&instance->tx_channel.tasklet); 1306 1307 if (instance->atm_dev && instance->driver->atm_stop) 1308 instance->driver->atm_stop(instance, instance->atm_dev); 1309 1310 if (instance->driver->unbind) 1311 instance->driver->unbind(instance, intf); 1312 1313 instance->driver_data = NULL; 1314 1315 for (i = 0; i < num_rcv_urbs + num_snd_urbs; i++) { 1316 kfree(instance->urbs[i]->transfer_buffer); 1317 usb_free_urb(instance->urbs[i]); 1318 } 1319 1320 kfree(instance->cell_buf); 1321 1322 /* ATM finalize */ 1323 if (instance->atm_dev) { 1324 atm_dev_deregister(instance->atm_dev); 1325 instance->atm_dev = NULL; 1326 } 1327 1328 usbatm_put_instance(instance); /* taken in usbatm_usb_probe */ 1329 } 1330 EXPORT_SYMBOL_GPL(usbatm_usb_disconnect); 1331 1332 1333 /*********** 1334 ** init ** 1335 ***********/ 1336 1337 static int __init usbatm_usb_init(void) 1338 { 1339 if (sizeof(struct usbatm_control) > FIELD_SIZEOF(struct sk_buff, cb)) { 1340 printk(KERN_ERR "%s unusable with this kernel!\n", usbatm_driver_name); 1341 return -EIO; 1342 } 1343 1344 if ((num_rcv_urbs > UDSL_MAX_RCV_URBS) 1345 || (num_snd_urbs > UDSL_MAX_SND_URBS) 1346 || (rcv_buf_bytes < 1) 1347 || (rcv_buf_bytes > UDSL_MAX_BUF_SIZE) 1348 || (snd_buf_bytes < 1) 1349 || (snd_buf_bytes > UDSL_MAX_BUF_SIZE)) 1350 return -EINVAL; 1351 1352 return 0; 1353 } 1354 module_init(usbatm_usb_init); 1355 1356 static void __exit usbatm_usb_exit(void) 1357 { 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(struct usbatm_data *instance, 1372 const unsigned char *data, int len) 1373 { 1374 unsigned char buffer[256]; 1375 int i = 0, j = 0; 1376 1377 for (i = 0; i < len;) { 1378 buffer[0] = '\0'; 1379 sprintf(buffer, "%.3d :", i); 1380 for (j = 0; (j < 16) && (i < len); j++, i++) 1381 sprintf(buffer, "%s %2.2x", buffer, data[i]); 1382 dev_dbg(&instance->usb_intf->dev, "%s", buffer); 1383 } 1384 return i; 1385 } 1386 #endif 1387