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 if ((vci != instance->cached_vci) || (vpi != instance->cached_vpi)) { 315 instance->cached_vpi = vpi; 316 instance->cached_vci = vci; 317 318 instance->cached_vcc = usbatm_find_vcc(instance, vpi, vci); 319 320 if (!instance->cached_vcc) 321 atm_rldbg(instance, "%s: unknown vpi/vci (%hd/%d)!\n", __func__, vpi, vci); 322 } 323 324 if (!instance->cached_vcc) 325 return; 326 327 vcc = instance->cached_vcc->vcc; 328 329 /* OAM F5 end-to-end */ 330 if (pti == ATM_PTI_E2EF5) { 331 if (printk_ratelimit()) 332 atm_warn(instance, "%s: OAM not supported (vpi %d, vci %d)!\n", 333 __func__, vpi, vci); 334 atomic_inc(&vcc->stats->rx_err); 335 return; 336 } 337 338 sarb = instance->cached_vcc->sarb; 339 340 if (sarb->tail + ATM_CELL_PAYLOAD > sarb->end) { 341 atm_rldbg(instance, "%s: buffer overrun (sarb->len %u, vcc: 0x%p)!\n", 342 __func__, sarb->len, vcc); 343 /* discard cells already received */ 344 skb_trim(sarb, 0); 345 } 346 347 memcpy(skb_tail_pointer(sarb), source + ATM_CELL_HEADER, ATM_CELL_PAYLOAD); 348 __skb_put(sarb, ATM_CELL_PAYLOAD); 349 350 if (pti & 1) { 351 struct sk_buff *skb; 352 unsigned int length; 353 unsigned int pdu_length; 354 355 length = (source[ATM_CELL_SIZE - 6] << 8) + source[ATM_CELL_SIZE - 5]; 356 357 /* guard against overflow */ 358 if (length > ATM_MAX_AAL5_PDU) { 359 atm_rldbg(instance, "%s: bogus length %u (vcc: 0x%p)!\n", 360 __func__, length, vcc); 361 atomic_inc(&vcc->stats->rx_err); 362 goto out; 363 } 364 365 pdu_length = usbatm_pdu_length(length); 366 367 if (sarb->len < pdu_length) { 368 atm_rldbg(instance, "%s: bogus pdu_length %u (sarb->len: %u, vcc: 0x%p)!\n", 369 __func__, pdu_length, sarb->len, vcc); 370 atomic_inc(&vcc->stats->rx_err); 371 goto out; 372 } 373 374 if (crc32_be(~0, skb_tail_pointer(sarb) - pdu_length, pdu_length) != 0xc704dd7b) { 375 atm_rldbg(instance, "%s: packet failed crc check (vcc: 0x%p)!\n", 376 __func__, vcc); 377 atomic_inc(&vcc->stats->rx_err); 378 goto out; 379 } 380 381 vdbg(&instance->usb_intf->dev, 382 "%s: got packet (length: %u, pdu_length: %u, vcc: 0x%p)", 383 __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(&instance->usb_intf->dev, 394 "%s: allocated new sk_buff (skb: 0x%p, skb->truesize: %u)", 395 __func__, skb, skb->truesize); 396 397 if (!atm_charge(vcc, skb->truesize)) { 398 atm_rldbg(instance, "%s: failed atm_charge (skb->truesize: %u)!\n", 399 __func__, skb->truesize); 400 dev_kfree_skb_any(skb); 401 goto out; /* atm_charge increments rx_drop */ 402 } 403 404 skb_copy_to_linear_data(skb, 405 skb_tail_pointer(sarb) - pdu_length, 406 length); 407 __skb_put(skb, length); 408 409 vdbg(&instance->usb_intf->dev, 410 "%s: sending skb 0x%p, skb->len %u, skb->truesize %u", 411 __func__, skb, skb->len, skb->truesize); 412 413 PACKETDEBUG(instance, skb->data, skb->len); 414 415 vcc->push(vcc, skb); 416 417 atomic_inc(&vcc->stats->rx); 418 out: 419 skb_trim(sarb, 0); 420 } 421 } 422 423 static void usbatm_extract_cells(struct usbatm_data *instance, 424 unsigned char *source, unsigned int avail_data) 425 { 426 unsigned int stride = instance->rx_channel.stride; 427 unsigned int buf_usage = instance->buf_usage; 428 429 /* extract cells from incoming data, taking into account that 430 * the length of avail data may not be a multiple of stride */ 431 432 if (buf_usage > 0) { 433 /* we have a partially received atm cell */ 434 unsigned char *cell_buf = instance->cell_buf; 435 unsigned int space_left = stride - buf_usage; 436 437 if (avail_data >= space_left) { 438 /* add new data and process cell */ 439 memcpy(cell_buf + buf_usage, source, space_left); 440 source += space_left; 441 avail_data -= space_left; 442 usbatm_extract_one_cell(instance, cell_buf); 443 instance->buf_usage = 0; 444 } else { 445 /* not enough data to fill the cell */ 446 memcpy(cell_buf + buf_usage, source, avail_data); 447 instance->buf_usage = buf_usage + avail_data; 448 return; 449 } 450 } 451 452 for (; avail_data >= stride; avail_data -= stride, source += stride) 453 usbatm_extract_one_cell(instance, source); 454 455 if (avail_data > 0) { 456 /* length was not a multiple of stride - 457 * save remaining data for next call */ 458 memcpy(instance->cell_buf, source, avail_data); 459 instance->buf_usage = avail_data; 460 } 461 } 462 463 464 /************* 465 ** encode ** 466 *************/ 467 468 static unsigned int usbatm_write_cells(struct usbatm_data *instance, 469 struct sk_buff *skb, 470 u8 *target, unsigned int avail_space) 471 { 472 struct usbatm_control *ctrl = UDSL_SKB(skb); 473 struct atm_vcc *vcc = ctrl->atm.vcc; 474 unsigned int bytes_written; 475 unsigned int stride = instance->tx_channel.stride; 476 477 for (bytes_written = 0; bytes_written < avail_space && ctrl->len; 478 bytes_written += stride, target += stride) { 479 unsigned int data_len = min_t(unsigned int, skb->len, ATM_CELL_PAYLOAD); 480 unsigned int left = ATM_CELL_PAYLOAD - data_len; 481 u8 *ptr = target; 482 483 ptr[0] = vcc->vpi >> 4; 484 ptr[1] = (vcc->vpi << 4) | (vcc->vci >> 12); 485 ptr[2] = vcc->vci >> 4; 486 ptr[3] = vcc->vci << 4; 487 ptr[4] = 0xec; 488 ptr += ATM_CELL_HEADER; 489 490 skb_copy_from_linear_data(skb, ptr, data_len); 491 ptr += data_len; 492 __skb_pull(skb, data_len); 493 494 if (!left) 495 continue; 496 497 memset(ptr, 0, left); 498 499 if (left >= ATM_AAL5_TRAILER) { /* trailer will go in this cell */ 500 u8 *trailer = target + ATM_CELL_SIZE - ATM_AAL5_TRAILER; 501 /* trailer[0] = 0; UU = 0 */ 502 /* trailer[1] = 0; CPI = 0 */ 503 trailer[2] = ctrl->len >> 8; 504 trailer[3] = ctrl->len; 505 506 ctrl->crc = ~crc32_be(ctrl->crc, ptr, left - 4); 507 508 trailer[4] = ctrl->crc >> 24; 509 trailer[5] = ctrl->crc >> 16; 510 trailer[6] = ctrl->crc >> 8; 511 trailer[7] = ctrl->crc; 512 513 target[3] |= 0x2; /* adjust PTI */ 514 515 ctrl->len = 0; /* tag this skb finished */ 516 } else 517 ctrl->crc = crc32_be(ctrl->crc, ptr, left); 518 } 519 520 return bytes_written; 521 } 522 523 524 /************** 525 ** receive ** 526 **************/ 527 528 static void usbatm_rx_process(unsigned long data) 529 { 530 struct usbatm_data *instance = (struct usbatm_data *)data; 531 struct urb *urb; 532 533 while ((urb = usbatm_pop_urb(&instance->rx_channel))) { 534 vdbg(&instance->usb_intf->dev, 535 "%s: processing urb 0x%p", __func__, urb); 536 537 if (usb_pipeisoc(urb->pipe)) { 538 unsigned char *merge_start = NULL; 539 unsigned int merge_length = 0; 540 const unsigned int packet_size = instance->rx_channel.packet_size; 541 int i; 542 543 for (i = 0; i < urb->number_of_packets; i++) { 544 if (!urb->iso_frame_desc[i].status) { 545 unsigned int actual_length = urb->iso_frame_desc[i].actual_length; 546 547 if (!merge_length) 548 merge_start = (unsigned char *)urb->transfer_buffer + urb->iso_frame_desc[i].offset; 549 merge_length += actual_length; 550 if (merge_length && (actual_length < packet_size)) { 551 usbatm_extract_cells(instance, merge_start, merge_length); 552 merge_length = 0; 553 } 554 } else { 555 atm_rldbg(instance, "%s: status %d in frame %d!\n", __func__, urb->status, i); 556 if (merge_length) 557 usbatm_extract_cells(instance, merge_start, merge_length); 558 merge_length = 0; 559 instance->buf_usage = 0; 560 } 561 } 562 563 if (merge_length) 564 usbatm_extract_cells(instance, merge_start, merge_length); 565 } else 566 if (!urb->status) 567 usbatm_extract_cells(instance, urb->transfer_buffer, urb->actual_length); 568 else 569 instance->buf_usage = 0; 570 571 if (usbatm_submit_urb(urb)) 572 return; 573 } 574 } 575 576 577 /*********** 578 ** send ** 579 ***********/ 580 581 static void usbatm_tx_process(unsigned long data) 582 { 583 struct usbatm_data *instance = (struct usbatm_data *)data; 584 struct sk_buff *skb = instance->current_skb; 585 struct urb *urb = NULL; 586 const unsigned int buf_size = instance->tx_channel.buf_size; 587 unsigned int bytes_written = 0; 588 u8 *buffer = NULL; 589 590 if (!skb) 591 skb = skb_dequeue(&instance->sndqueue); 592 593 while (skb) { 594 if (!urb) { 595 urb = usbatm_pop_urb(&instance->tx_channel); 596 if (!urb) 597 break; /* no more senders */ 598 buffer = urb->transfer_buffer; 599 bytes_written = (urb->status == -EAGAIN) ? 600 urb->transfer_buffer_length : 0; 601 } 602 603 bytes_written += usbatm_write_cells(instance, skb, 604 buffer + bytes_written, 605 buf_size - bytes_written); 606 607 vdbg(&instance->usb_intf->dev, 608 "%s: wrote %u bytes from skb 0x%p to urb 0x%p", 609 __func__, bytes_written, skb, urb); 610 611 if (!UDSL_SKB(skb)->len) { 612 struct atm_vcc *vcc = UDSL_SKB(skb)->atm.vcc; 613 614 usbatm_pop(vcc, skb); 615 atomic_inc(&vcc->stats->tx); 616 617 skb = skb_dequeue(&instance->sndqueue); 618 } 619 620 if (bytes_written == buf_size || (!skb && bytes_written)) { 621 urb->transfer_buffer_length = bytes_written; 622 623 if (usbatm_submit_urb(urb)) 624 break; 625 urb = NULL; 626 } 627 } 628 629 instance->current_skb = skb; 630 } 631 632 static void usbatm_cancel_send(struct usbatm_data *instance, 633 struct atm_vcc *vcc) 634 { 635 struct sk_buff *skb, *n; 636 637 spin_lock_irq(&instance->sndqueue.lock); 638 skb_queue_walk_safe(&instance->sndqueue, skb, n) { 639 if (UDSL_SKB(skb)->atm.vcc == vcc) { 640 atm_dbg(instance, "%s: popping skb 0x%p\n", __func__, skb); 641 __skb_unlink(skb, &instance->sndqueue); 642 usbatm_pop(vcc, skb); 643 } 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 } 655 656 static int usbatm_atm_send(struct atm_vcc *vcc, struct sk_buff *skb) 657 { 658 struct usbatm_data *instance = vcc->dev->dev_data; 659 struct usbatm_control *ctrl = UDSL_SKB(skb); 660 int err; 661 662 /* racy disconnection check - fine */ 663 if (!instance || instance->disconnected) { 664 #ifdef VERBOSE_DEBUG 665 printk_ratelimited(KERN_DEBUG "%s: %s!\n", __func__, instance ? "disconnected" : "NULL instance"); 666 #endif 667 err = -ENODEV; 668 goto fail; 669 } 670 671 if (vcc->qos.aal != ATM_AAL5) { 672 atm_rldbg(instance, "%s: unsupported ATM type %d!\n", __func__, vcc->qos.aal); 673 err = -EINVAL; 674 goto fail; 675 } 676 677 if (skb->len > ATM_MAX_AAL5_PDU) { 678 atm_rldbg(instance, "%s: packet too long (%d vs %d)!\n", 679 __func__, skb->len, ATM_MAX_AAL5_PDU); 680 err = -EINVAL; 681 goto fail; 682 } 683 684 PACKETDEBUG(instance, skb->data, skb->len); 685 686 /* initialize the control block */ 687 ctrl->atm.vcc = vcc; 688 ctrl->len = skb->len; 689 ctrl->crc = crc32_be(~0, skb->data, skb->len); 690 691 skb_queue_tail(&instance->sndqueue, skb); 692 tasklet_schedule(&instance->tx_channel.tasklet); 693 694 return 0; 695 696 fail: 697 usbatm_pop(vcc, skb); 698 return err; 699 } 700 701 702 /******************** 703 ** bean counting ** 704 ********************/ 705 706 static void usbatm_destroy_instance(struct kref *kref) 707 { 708 struct usbatm_data *instance = container_of(kref, struct usbatm_data, refcount); 709 710 tasklet_kill(&instance->rx_channel.tasklet); 711 tasklet_kill(&instance->tx_channel.tasklet); 712 usb_put_dev(instance->usb_dev); 713 kfree(instance); 714 } 715 716 static void usbatm_get_instance(struct usbatm_data *instance) 717 { 718 kref_get(&instance->refcount); 719 } 720 721 static void usbatm_put_instance(struct usbatm_data *instance) 722 { 723 kref_put(&instance->refcount, usbatm_destroy_instance); 724 } 725 726 727 /********** 728 ** ATM ** 729 **********/ 730 731 static void usbatm_atm_dev_close(struct atm_dev *atm_dev) 732 { 733 struct usbatm_data *instance = atm_dev->dev_data; 734 735 if (!instance) 736 return; 737 738 atm_dev->dev_data = NULL; /* catch bugs */ 739 usbatm_put_instance(instance); /* taken in usbatm_atm_init */ 740 } 741 742 static int usbatm_atm_proc_read(struct atm_dev *atm_dev, loff_t * pos, char *page) 743 { 744 struct usbatm_data *instance = atm_dev->dev_data; 745 int left = *pos; 746 747 if (!instance) 748 return -ENODEV; 749 750 if (!left--) 751 return sprintf(page, "%s\n", instance->description); 752 753 if (!left--) 754 return sprintf(page, "MAC: %pM\n", atm_dev->esi); 755 756 if (!left--) 757 return sprintf(page, 758 "AAL5: tx %d ( %d err ), rx %d ( %d err, %d drop )\n", 759 atomic_read(&atm_dev->stats.aal5.tx), 760 atomic_read(&atm_dev->stats.aal5.tx_err), 761 atomic_read(&atm_dev->stats.aal5.rx), 762 atomic_read(&atm_dev->stats.aal5.rx_err), 763 atomic_read(&atm_dev->stats.aal5.rx_drop)); 764 765 if (!left--) { 766 if (instance->disconnected) 767 return sprintf(page, "Disconnected\n"); 768 else 769 switch (atm_dev->signal) { 770 case ATM_PHY_SIG_FOUND: 771 return sprintf(page, "Line up\n"); 772 case ATM_PHY_SIG_LOST: 773 return sprintf(page, "Line down\n"); 774 default: 775 return sprintf(page, "Line state unknown\n"); 776 } 777 } 778 779 return 0; 780 } 781 782 static int usbatm_atm_open(struct atm_vcc *vcc) 783 { 784 struct usbatm_data *instance = vcc->dev->dev_data; 785 struct usbatm_vcc_data *new = NULL; 786 int ret; 787 int vci = vcc->vci; 788 short vpi = vcc->vpi; 789 790 if (!instance) 791 return -ENODEV; 792 793 /* only support AAL5 */ 794 if ((vcc->qos.aal != ATM_AAL5)) { 795 atm_warn(instance, "%s: unsupported ATM type %d!\n", __func__, vcc->qos.aal); 796 return -EINVAL; 797 } 798 799 /* sanity checks */ 800 if ((vcc->qos.rxtp.max_sdu < 0) || (vcc->qos.rxtp.max_sdu > ATM_MAX_AAL5_PDU)) { 801 atm_dbg(instance, "%s: max_sdu %d out of range!\n", __func__, vcc->qos.rxtp.max_sdu); 802 return -EINVAL; 803 } 804 805 mutex_lock(&instance->serialize); /* vs self, usbatm_atm_close, usbatm_usb_disconnect */ 806 807 if (instance->disconnected) { 808 atm_dbg(instance, "%s: disconnected!\n", __func__); 809 ret = -ENODEV; 810 goto fail; 811 } 812 813 if (usbatm_find_vcc(instance, vpi, vci)) { 814 atm_dbg(instance, "%s: %hd/%d already in use!\n", __func__, vpi, vci); 815 ret = -EADDRINUSE; 816 goto fail; 817 } 818 819 if (!(new = kzalloc(sizeof(struct usbatm_vcc_data), GFP_KERNEL))) { 820 atm_err(instance, "%s: no memory for vcc_data!\n", __func__); 821 ret = -ENOMEM; 822 goto fail; 823 } 824 825 new->vcc = vcc; 826 new->vpi = vpi; 827 new->vci = vci; 828 829 new->sarb = alloc_skb(usbatm_pdu_length(vcc->qos.rxtp.max_sdu), GFP_KERNEL); 830 if (!new->sarb) { 831 atm_err(instance, "%s: no memory for SAR buffer!\n", __func__); 832 ret = -ENOMEM; 833 goto fail; 834 } 835 836 vcc->dev_data = new; 837 838 tasklet_disable(&instance->rx_channel.tasklet); 839 instance->cached_vcc = new; 840 instance->cached_vpi = vpi; 841 instance->cached_vci = vci; 842 list_add(&new->list, &instance->vcc_list); 843 tasklet_enable(&instance->rx_channel.tasklet); 844 845 set_bit(ATM_VF_ADDR, &vcc->flags); 846 set_bit(ATM_VF_PARTIAL, &vcc->flags); 847 set_bit(ATM_VF_READY, &vcc->flags); 848 849 mutex_unlock(&instance->serialize); 850 851 atm_dbg(instance, "%s: allocated vcc data 0x%p\n", __func__, new); 852 853 return 0; 854 855 fail: 856 kfree(new); 857 mutex_unlock(&instance->serialize); 858 return ret; 859 } 860 861 static void usbatm_atm_close(struct atm_vcc *vcc) 862 { 863 struct usbatm_data *instance = vcc->dev->dev_data; 864 struct usbatm_vcc_data *vcc_data = vcc->dev_data; 865 866 if (!instance || !vcc_data) 867 return; 868 869 usbatm_cancel_send(instance, vcc); 870 871 mutex_lock(&instance->serialize); /* vs self, usbatm_atm_open, usbatm_usb_disconnect */ 872 873 tasklet_disable(&instance->rx_channel.tasklet); 874 if (instance->cached_vcc == vcc_data) { 875 instance->cached_vcc = NULL; 876 instance->cached_vpi = ATM_VPI_UNSPEC; 877 instance->cached_vci = ATM_VCI_UNSPEC; 878 } 879 list_del(&vcc_data->list); 880 tasklet_enable(&instance->rx_channel.tasklet); 881 882 kfree_skb(vcc_data->sarb); 883 vcc_data->sarb = NULL; 884 885 kfree(vcc_data); 886 vcc->dev_data = NULL; 887 888 vcc->vpi = ATM_VPI_UNSPEC; 889 vcc->vci = ATM_VCI_UNSPEC; 890 clear_bit(ATM_VF_READY, &vcc->flags); 891 clear_bit(ATM_VF_PARTIAL, &vcc->flags); 892 clear_bit(ATM_VF_ADDR, &vcc->flags); 893 894 mutex_unlock(&instance->serialize); 895 } 896 897 static int usbatm_atm_ioctl(struct atm_dev *atm_dev, unsigned int cmd, 898 void __user * arg) 899 { 900 struct usbatm_data *instance = atm_dev->dev_data; 901 902 if (!instance || instance->disconnected) 903 return -ENODEV; 904 905 switch (cmd) { 906 case ATM_QUERYLOOP: 907 return put_user(ATM_LM_NONE, (int __user *)arg) ? -EFAULT : 0; 908 default: 909 return -ENOIOCTLCMD; 910 } 911 } 912 913 static int usbatm_atm_init(struct usbatm_data *instance) 914 { 915 struct atm_dev *atm_dev; 916 int ret, i; 917 918 /* ATM init. The ATM initialization scheme suffers from an intrinsic race 919 * condition: callbacks we register can be executed at once, before we have 920 * initialized the struct atm_dev. To protect against this, all callbacks 921 * abort if atm_dev->dev_data is NULL. */ 922 atm_dev = atm_dev_register(instance->driver_name, 923 &instance->usb_intf->dev, &usbatm_atm_devops, 924 -1, NULL); 925 if (!atm_dev) { 926 usb_err(instance, "%s: failed to register ATM device!\n", __func__); 927 return -1; 928 } 929 930 instance->atm_dev = atm_dev; 931 932 atm_dev->ci_range.vpi_bits = ATM_CI_MAX; 933 atm_dev->ci_range.vci_bits = ATM_CI_MAX; 934 atm_dev->signal = ATM_PHY_SIG_UNKNOWN; 935 936 /* temp init ATM device, set to 128kbit */ 937 atm_dev->link_rate = 128 * 1000 / 424; 938 939 if (instance->driver->atm_start && ((ret = instance->driver->atm_start(instance, atm_dev)) < 0)) { 940 atm_err(instance, "%s: atm_start failed: %d!\n", __func__, ret); 941 goto fail; 942 } 943 944 usbatm_get_instance(instance); /* dropped in usbatm_atm_dev_close */ 945 946 /* ready for ATM callbacks */ 947 mb(); 948 atm_dev->dev_data = instance; 949 950 /* submit all rx URBs */ 951 for (i = 0; i < num_rcv_urbs; i++) 952 usbatm_submit_urb(instance->urbs[i]); 953 954 return 0; 955 956 fail: 957 instance->atm_dev = NULL; 958 atm_dev_deregister(atm_dev); /* usbatm_atm_dev_close will eventually be called */ 959 return ret; 960 } 961 962 963 /********** 964 ** USB ** 965 **********/ 966 967 static int usbatm_do_heavy_init(void *arg) 968 { 969 struct usbatm_data *instance = arg; 970 int ret; 971 972 allow_signal(SIGTERM); 973 complete(&instance->thread_started); 974 975 ret = instance->driver->heavy_init(instance, instance->usb_intf); 976 977 if (!ret) 978 ret = usbatm_atm_init(instance); 979 980 mutex_lock(&instance->serialize); 981 instance->thread = NULL; 982 mutex_unlock(&instance->serialize); 983 984 complete_and_exit(&instance->thread_exited, ret); 985 } 986 987 static int usbatm_heavy_init(struct usbatm_data *instance) 988 { 989 struct task_struct *t; 990 991 t = kthread_create(usbatm_do_heavy_init, instance, "%s", 992 instance->driver->driver_name); 993 if (IS_ERR(t)) { 994 usb_err(instance, "%s: failed to create kernel_thread (%ld)!\n", 995 __func__, PTR_ERR(t)); 996 return PTR_ERR(t); 997 } 998 999 instance->thread = t; 1000 wake_up_process(t); 1001 wait_for_completion(&instance->thread_started); 1002 1003 return 0; 1004 } 1005 1006 static void usbatm_tasklet_schedule(unsigned long data) 1007 { 1008 tasklet_schedule((struct tasklet_struct *) data); 1009 } 1010 1011 static void usbatm_init_channel(struct usbatm_channel *channel) 1012 { 1013 spin_lock_init(&channel->lock); 1014 INIT_LIST_HEAD(&channel->list); 1015 channel->delay.function = usbatm_tasklet_schedule; 1016 channel->delay.data = (unsigned long) &channel->tasklet; 1017 init_timer(&channel->delay); 1018 } 1019 1020 int usbatm_usb_probe(struct usb_interface *intf, const struct usb_device_id *id, 1021 struct usbatm_driver *driver) 1022 { 1023 struct device *dev = &intf->dev; 1024 struct usb_device *usb_dev = interface_to_usbdev(intf); 1025 struct usbatm_data *instance; 1026 char *buf; 1027 int error = -ENOMEM; 1028 int i, length; 1029 unsigned int maxpacket, num_packets; 1030 1031 /* instance init */ 1032 instance = kzalloc(sizeof(*instance) + sizeof(struct urb *) * (num_rcv_urbs + num_snd_urbs), GFP_KERNEL); 1033 if (!instance) { 1034 dev_err(dev, "%s: no memory for instance data!\n", __func__); 1035 return -ENOMEM; 1036 } 1037 1038 /* public fields */ 1039 1040 instance->driver = driver; 1041 strlcpy(instance->driver_name, driver->driver_name, 1042 sizeof(instance->driver_name)); 1043 1044 instance->usb_dev = usb_dev; 1045 instance->usb_intf = intf; 1046 1047 buf = instance->description; 1048 length = sizeof(instance->description); 1049 1050 if ((i = usb_string(usb_dev, usb_dev->descriptor.iProduct, buf, length)) < 0) 1051 goto bind; 1052 1053 buf += i; 1054 length -= i; 1055 1056 i = scnprintf(buf, length, " ("); 1057 buf += i; 1058 length -= i; 1059 1060 if (length <= 0 || (i = usb_make_path(usb_dev, buf, length)) < 0) 1061 goto bind; 1062 1063 buf += i; 1064 length -= i; 1065 1066 snprintf(buf, length, ")"); 1067 1068 bind: 1069 if (driver->bind && (error = driver->bind(instance, intf, id)) < 0) { 1070 dev_err(dev, "%s: bind failed: %d!\n", __func__, error); 1071 goto fail_free; 1072 } 1073 1074 /* private fields */ 1075 1076 kref_init(&instance->refcount); /* dropped in usbatm_usb_disconnect */ 1077 mutex_init(&instance->serialize); 1078 1079 instance->thread = NULL; 1080 init_completion(&instance->thread_started); 1081 init_completion(&instance->thread_exited); 1082 1083 INIT_LIST_HEAD(&instance->vcc_list); 1084 skb_queue_head_init(&instance->sndqueue); 1085 1086 usbatm_init_channel(&instance->rx_channel); 1087 usbatm_init_channel(&instance->tx_channel); 1088 tasklet_init(&instance->rx_channel.tasklet, usbatm_rx_process, (unsigned long)instance); 1089 tasklet_init(&instance->tx_channel.tasklet, usbatm_tx_process, (unsigned long)instance); 1090 instance->rx_channel.stride = ATM_CELL_SIZE + driver->rx_padding; 1091 instance->tx_channel.stride = ATM_CELL_SIZE + driver->tx_padding; 1092 instance->rx_channel.usbatm = instance->tx_channel.usbatm = instance; 1093 1094 if ((instance->flags & UDSL_USE_ISOC) && driver->isoc_in) 1095 instance->rx_channel.endpoint = usb_rcvisocpipe(usb_dev, driver->isoc_in); 1096 else 1097 instance->rx_channel.endpoint = usb_rcvbulkpipe(usb_dev, driver->bulk_in); 1098 1099 instance->tx_channel.endpoint = usb_sndbulkpipe(usb_dev, driver->bulk_out); 1100 1101 /* tx buffer size must be a positive multiple of the stride */ 1102 instance->tx_channel.buf_size = max(instance->tx_channel.stride, 1103 snd_buf_bytes - (snd_buf_bytes % instance->tx_channel.stride)); 1104 1105 /* rx buffer size must be a positive multiple of the endpoint maxpacket */ 1106 maxpacket = usb_maxpacket(usb_dev, instance->rx_channel.endpoint, 0); 1107 1108 if ((maxpacket < 1) || (maxpacket > UDSL_MAX_BUF_SIZE)) { 1109 dev_err(dev, "%s: invalid endpoint %02x!\n", __func__, 1110 usb_pipeendpoint(instance->rx_channel.endpoint)); 1111 error = -EINVAL; 1112 goto fail_unbind; 1113 } 1114 1115 num_packets = max(1U, (rcv_buf_bytes + maxpacket / 2) / maxpacket); /* round */ 1116 1117 if (num_packets * maxpacket > UDSL_MAX_BUF_SIZE) 1118 num_packets--; 1119 1120 instance->rx_channel.buf_size = num_packets * maxpacket; 1121 instance->rx_channel.packet_size = maxpacket; 1122 1123 for (i = 0; i < 2; i++) { 1124 struct usbatm_channel *channel = i ? 1125 &instance->tx_channel : &instance->rx_channel; 1126 1127 dev_dbg(dev, "%s: using %d byte buffer for %s channel 0x%p\n", 1128 __func__, channel->buf_size, i ? "tx" : "rx", channel); 1129 } 1130 1131 /* initialize urbs */ 1132 1133 for (i = 0; i < num_rcv_urbs + num_snd_urbs; i++) { 1134 u8 *buffer; 1135 struct usbatm_channel *channel = i < num_rcv_urbs ? 1136 &instance->rx_channel : &instance->tx_channel; 1137 struct urb *urb; 1138 unsigned int iso_packets = usb_pipeisoc(channel->endpoint) ? channel->buf_size / channel->packet_size : 0; 1139 1140 urb = usb_alloc_urb(iso_packets, GFP_KERNEL); 1141 if (!urb) { 1142 dev_err(dev, "%s: no memory for urb %d!\n", __func__, i); 1143 error = -ENOMEM; 1144 goto fail_unbind; 1145 } 1146 1147 instance->urbs[i] = urb; 1148 1149 /* zero the tx padding to avoid leaking information */ 1150 buffer = kzalloc(channel->buf_size, GFP_KERNEL); 1151 if (!buffer) { 1152 dev_err(dev, "%s: no memory for buffer %d!\n", __func__, i); 1153 error = -ENOMEM; 1154 goto fail_unbind; 1155 } 1156 1157 usb_fill_bulk_urb(urb, instance->usb_dev, channel->endpoint, 1158 buffer, channel->buf_size, usbatm_complete, channel); 1159 if (iso_packets) { 1160 int j; 1161 urb->interval = 1; 1162 urb->transfer_flags = URB_ISO_ASAP; 1163 urb->number_of_packets = iso_packets; 1164 for (j = 0; j < iso_packets; j++) { 1165 urb->iso_frame_desc[j].offset = channel->packet_size * j; 1166 urb->iso_frame_desc[j].length = channel->packet_size; 1167 } 1168 } 1169 1170 /* put all tx URBs on the list of spares */ 1171 if (i >= num_rcv_urbs) 1172 list_add_tail(&urb->urb_list, &channel->list); 1173 1174 vdbg(&intf->dev, "%s: alloced buffer 0x%p buf size %u urb 0x%p", 1175 __func__, urb->transfer_buffer, urb->transfer_buffer_length, urb); 1176 } 1177 1178 instance->cached_vpi = ATM_VPI_UNSPEC; 1179 instance->cached_vci = ATM_VCI_UNSPEC; 1180 instance->cell_buf = kmalloc(instance->rx_channel.stride, GFP_KERNEL); 1181 1182 if (!instance->cell_buf) { 1183 dev_err(dev, "%s: no memory for cell buffer!\n", __func__); 1184 error = -ENOMEM; 1185 goto fail_unbind; 1186 } 1187 1188 if (!(instance->flags & UDSL_SKIP_HEAVY_INIT) && driver->heavy_init) { 1189 error = usbatm_heavy_init(instance); 1190 } else { 1191 complete(&instance->thread_exited); /* pretend that heavy_init was run */ 1192 error = usbatm_atm_init(instance); 1193 } 1194 1195 if (error < 0) 1196 goto fail_unbind; 1197 1198 usb_get_dev(usb_dev); 1199 usb_set_intfdata(intf, instance); 1200 1201 return 0; 1202 1203 fail_unbind: 1204 if (instance->driver->unbind) 1205 instance->driver->unbind(instance, intf); 1206 fail_free: 1207 kfree(instance->cell_buf); 1208 1209 for (i = 0; i < num_rcv_urbs + num_snd_urbs; i++) { 1210 if (instance->urbs[i]) 1211 kfree(instance->urbs[i]->transfer_buffer); 1212 usb_free_urb(instance->urbs[i]); 1213 } 1214 1215 kfree(instance); 1216 1217 return error; 1218 } 1219 EXPORT_SYMBOL_GPL(usbatm_usb_probe); 1220 1221 void usbatm_usb_disconnect(struct usb_interface *intf) 1222 { 1223 struct device *dev = &intf->dev; 1224 struct usbatm_data *instance = usb_get_intfdata(intf); 1225 struct usbatm_vcc_data *vcc_data; 1226 int i; 1227 1228 if (!instance) { 1229 dev_dbg(dev, "%s: NULL instance!\n", __func__); 1230 return; 1231 } 1232 1233 usb_set_intfdata(intf, NULL); 1234 1235 mutex_lock(&instance->serialize); 1236 instance->disconnected = 1; 1237 if (instance->thread != NULL) 1238 send_sig(SIGTERM, instance->thread, 1); 1239 mutex_unlock(&instance->serialize); 1240 1241 wait_for_completion(&instance->thread_exited); 1242 1243 mutex_lock(&instance->serialize); 1244 list_for_each_entry(vcc_data, &instance->vcc_list, list) 1245 vcc_release_async(vcc_data->vcc, -EPIPE); 1246 mutex_unlock(&instance->serialize); 1247 1248 tasklet_disable(&instance->rx_channel.tasklet); 1249 tasklet_disable(&instance->tx_channel.tasklet); 1250 1251 for (i = 0; i < num_rcv_urbs + num_snd_urbs; i++) 1252 usb_kill_urb(instance->urbs[i]); 1253 1254 del_timer_sync(&instance->rx_channel.delay); 1255 del_timer_sync(&instance->tx_channel.delay); 1256 1257 /* turn usbatm_[rt]x_process into something close to a no-op */ 1258 /* no need to take the spinlock */ 1259 INIT_LIST_HEAD(&instance->rx_channel.list); 1260 INIT_LIST_HEAD(&instance->tx_channel.list); 1261 1262 tasklet_enable(&instance->rx_channel.tasklet); 1263 tasklet_enable(&instance->tx_channel.tasklet); 1264 1265 if (instance->atm_dev && instance->driver->atm_stop) 1266 instance->driver->atm_stop(instance, instance->atm_dev); 1267 1268 if (instance->driver->unbind) 1269 instance->driver->unbind(instance, intf); 1270 1271 instance->driver_data = NULL; 1272 1273 for (i = 0; i < num_rcv_urbs + num_snd_urbs; i++) { 1274 kfree(instance->urbs[i]->transfer_buffer); 1275 usb_free_urb(instance->urbs[i]); 1276 } 1277 1278 kfree(instance->cell_buf); 1279 1280 /* ATM finalize */ 1281 if (instance->atm_dev) { 1282 atm_dev_deregister(instance->atm_dev); 1283 instance->atm_dev = NULL; 1284 } 1285 1286 usbatm_put_instance(instance); /* taken in usbatm_usb_probe */ 1287 } 1288 EXPORT_SYMBOL_GPL(usbatm_usb_disconnect); 1289 1290 1291 /*********** 1292 ** init ** 1293 ***********/ 1294 1295 static int __init usbatm_usb_init(void) 1296 { 1297 if (sizeof(struct usbatm_control) > FIELD_SIZEOF(struct sk_buff, cb)) { 1298 printk(KERN_ERR "%s unusable with this kernel!\n", usbatm_driver_name); 1299 return -EIO; 1300 } 1301 1302 if ((num_rcv_urbs > UDSL_MAX_RCV_URBS) 1303 || (num_snd_urbs > UDSL_MAX_SND_URBS) 1304 || (rcv_buf_bytes < 1) 1305 || (rcv_buf_bytes > UDSL_MAX_BUF_SIZE) 1306 || (snd_buf_bytes < 1) 1307 || (snd_buf_bytes > UDSL_MAX_BUF_SIZE)) 1308 return -EINVAL; 1309 1310 return 0; 1311 } 1312 module_init(usbatm_usb_init); 1313 1314 static void __exit usbatm_usb_exit(void) 1315 { 1316 } 1317 module_exit(usbatm_usb_exit); 1318 1319 MODULE_AUTHOR(DRIVER_AUTHOR); 1320 MODULE_DESCRIPTION(DRIVER_DESC); 1321 MODULE_LICENSE("GPL"); 1322 MODULE_VERSION(DRIVER_VERSION); 1323 1324 /************ 1325 ** debug ** 1326 ************/ 1327 1328 #ifdef VERBOSE_DEBUG 1329 static int usbatm_print_packet(struct usbatm_data *instance, 1330 const unsigned char *data, int len) 1331 { 1332 unsigned char buffer[256]; 1333 int i = 0, j = 0; 1334 1335 for (i = 0; i < len;) { 1336 buffer[0] = '\0'; 1337 sprintf(buffer, "%.3d :", i); 1338 for (j = 0; (j < 16) && (i < len); j++, i++) 1339 sprintf(buffer, "%s %2.2x", buffer, data[i]); 1340 dev_dbg(&instance->usb_intf->dev, "%s", buffer); 1341 } 1342 return i; 1343 } 1344 #endif 1345