1 /* $Id: capi.c,v 1.1.2.7 2004/04/28 09:48:59 armin Exp $ 2 * 3 * CAPI 2.0 Interface for Linux 4 * 5 * Copyright 1996 by Carsten Paeth <calle@calle.de> 6 * 7 * This software may be used and distributed according to the terms 8 * of the GNU General Public License, incorporated herein by reference. 9 * 10 */ 11 12 #include <linux/module.h> 13 #include <linux/errno.h> 14 #include <linux/kernel.h> 15 #include <linux/major.h> 16 #include <linux/sched.h> 17 #include <linux/slab.h> 18 #include <linux/fcntl.h> 19 #include <linux/fs.h> 20 #include <linux/signal.h> 21 #include <linux/mutex.h> 22 #include <linux/mm.h> 23 #include <linux/timer.h> 24 #include <linux/wait.h> 25 #ifdef CONFIG_ISDN_CAPI_MIDDLEWARE 26 #include <linux/tty.h> 27 #ifdef CONFIG_PPP 28 #include <linux/netdevice.h> 29 #include <linux/ppp_defs.h> 30 #include <linux/if_ppp.h> 31 #endif /* CONFIG_PPP */ 32 #endif /* CONFIG_ISDN_CAPI_MIDDLEWARE */ 33 #include <linux/skbuff.h> 34 #include <linux/proc_fs.h> 35 #include <linux/poll.h> 36 #include <linux/capi.h> 37 #include <linux/kernelcapi.h> 38 #include <linux/init.h> 39 #include <linux/device.h> 40 #include <linux/moduleparam.h> 41 #include <linux/isdn/capiutil.h> 42 #include <linux/isdn/capicmd.h> 43 #if defined(CONFIG_ISDN_CAPI_CAPIFS) || defined(CONFIG_ISDN_CAPI_CAPIFS_MODULE) 44 #include "capifs.h" 45 #endif 46 47 static char *revision = "$Revision: 1.1.2.7 $"; 48 49 MODULE_DESCRIPTION("CAPI4Linux: Userspace /dev/capi20 interface"); 50 MODULE_AUTHOR("Carsten Paeth"); 51 MODULE_LICENSE("GPL"); 52 53 #undef _DEBUG_REFCOUNT /* alloc/free and open/close debug */ 54 #undef _DEBUG_TTYFUNCS /* call to tty_driver */ 55 #undef _DEBUG_DATAFLOW /* data flow */ 56 57 /* -------- driver information -------------------------------------- */ 58 59 static struct class *capi_class; 60 61 static int capi_major = 68; /* allocated */ 62 #ifdef CONFIG_ISDN_CAPI_MIDDLEWARE 63 #define CAPINC_NR_PORTS 32 64 #define CAPINC_MAX_PORTS 256 65 static int capi_ttymajor = 191; 66 static int capi_ttyminors = CAPINC_NR_PORTS; 67 #endif /* CONFIG_ISDN_CAPI_MIDDLEWARE */ 68 69 module_param_named(major, capi_major, uint, 0); 70 #ifdef CONFIG_ISDN_CAPI_MIDDLEWARE 71 module_param_named(ttymajor, capi_ttymajor, uint, 0); 72 module_param_named(ttyminors, capi_ttyminors, uint, 0); 73 #endif /* CONFIG_ISDN_CAPI_MIDDLEWARE */ 74 75 /* -------- defines ------------------------------------------------- */ 76 77 #define CAPINC_MAX_RECVQUEUE 10 78 #define CAPINC_MAX_SENDQUEUE 10 79 #define CAPI_MAX_BLKSIZE 2048 80 81 /* -------- data structures ----------------------------------------- */ 82 83 struct capidev; 84 struct capincci; 85 #ifdef CONFIG_ISDN_CAPI_MIDDLEWARE 86 struct capiminor; 87 88 struct datahandle_queue { 89 struct list_head list; 90 u16 datahandle; 91 }; 92 93 struct capiminor { 94 struct list_head list; 95 struct capincci *nccip; 96 unsigned int minor; 97 98 struct capi20_appl *ap; 99 u32 ncci; 100 u16 datahandle; 101 u16 msgid; 102 103 struct tty_struct *tty; 104 int ttyinstop; 105 int ttyoutstop; 106 struct sk_buff *ttyskb; 107 atomic_t ttyopencount; 108 109 struct sk_buff_head inqueue; 110 int inbytes; 111 struct sk_buff_head outqueue; 112 int outbytes; 113 114 /* transmit path */ 115 struct list_head ackqueue; 116 int nack; 117 spinlock_t ackqlock; 118 }; 119 #endif /* CONFIG_ISDN_CAPI_MIDDLEWARE */ 120 121 /* FIXME: The following lock is a sledgehammer-workaround to a 122 * locking issue with the capiminor (and maybe other) data structure(s). 123 * Access to this data is done in a racy way and crashes the machine with 124 * a FritzCard DSL driver; sooner or later. This is a workaround 125 * which trades scalability vs stability, so it doesn't crash the kernel anymore. 126 * The correct (and scalable) fix for the issue seems to require 127 * an API change to the drivers... . */ 128 static DEFINE_SPINLOCK(workaround_lock); 129 130 struct capincci { 131 struct capincci *next; 132 u32 ncci; 133 struct capidev *cdev; 134 #ifdef CONFIG_ISDN_CAPI_MIDDLEWARE 135 struct capiminor *minorp; 136 #endif /* CONFIG_ISDN_CAPI_MIDDLEWARE */ 137 }; 138 139 struct capidev { 140 struct list_head list; 141 struct capi20_appl ap; 142 u16 errcode; 143 unsigned userflags; 144 145 struct sk_buff_head recvqueue; 146 wait_queue_head_t recvwait; 147 148 struct capincci *nccis; 149 150 struct mutex ncci_list_mtx; 151 }; 152 153 /* -------- global variables ---------------------------------------- */ 154 155 static DEFINE_RWLOCK(capidev_list_lock); 156 static LIST_HEAD(capidev_list); 157 158 #ifdef CONFIG_ISDN_CAPI_MIDDLEWARE 159 static DEFINE_RWLOCK(capiminor_list_lock); 160 static LIST_HEAD(capiminor_list); 161 #endif /* CONFIG_ISDN_CAPI_MIDDLEWARE */ 162 163 #ifdef CONFIG_ISDN_CAPI_MIDDLEWARE 164 /* -------- datahandles --------------------------------------------- */ 165 166 static int capincci_add_ack(struct capiminor *mp, u16 datahandle) 167 { 168 struct datahandle_queue *n; 169 unsigned long flags; 170 171 n = kmalloc(sizeof(*n), GFP_ATOMIC); 172 if (unlikely(!n)) { 173 printk(KERN_ERR "capi: alloc datahandle failed\n"); 174 return -1; 175 } 176 n->datahandle = datahandle; 177 INIT_LIST_HEAD(&n->list); 178 spin_lock_irqsave(&mp->ackqlock, flags); 179 list_add_tail(&n->list, &mp->ackqueue); 180 mp->nack++; 181 spin_unlock_irqrestore(&mp->ackqlock, flags); 182 return 0; 183 } 184 185 static int capiminor_del_ack(struct capiminor *mp, u16 datahandle) 186 { 187 struct datahandle_queue *p, *tmp; 188 unsigned long flags; 189 190 spin_lock_irqsave(&mp->ackqlock, flags); 191 list_for_each_entry_safe(p, tmp, &mp->ackqueue, list) { 192 if (p->datahandle == datahandle) { 193 list_del(&p->list); 194 kfree(p); 195 mp->nack--; 196 spin_unlock_irqrestore(&mp->ackqlock, flags); 197 return 0; 198 } 199 } 200 spin_unlock_irqrestore(&mp->ackqlock, flags); 201 return -1; 202 } 203 204 static void capiminor_del_all_ack(struct capiminor *mp) 205 { 206 struct datahandle_queue *p, *tmp; 207 unsigned long flags; 208 209 spin_lock_irqsave(&mp->ackqlock, flags); 210 list_for_each_entry_safe(p, tmp, &mp->ackqueue, list) { 211 list_del(&p->list); 212 kfree(p); 213 mp->nack--; 214 } 215 spin_unlock_irqrestore(&mp->ackqlock, flags); 216 } 217 218 219 /* -------- struct capiminor ---------------------------------------- */ 220 221 static struct capiminor *capiminor_alloc(struct capi20_appl *ap, u32 ncci) 222 { 223 struct capiminor *mp, *p; 224 unsigned int minor = 0; 225 unsigned long flags; 226 227 mp = kzalloc(sizeof(*mp), GFP_ATOMIC); 228 if (!mp) { 229 printk(KERN_ERR "capi: can't alloc capiminor\n"); 230 return NULL; 231 } 232 233 mp->ap = ap; 234 mp->ncci = ncci; 235 mp->msgid = 0; 236 atomic_set(&mp->ttyopencount,0); 237 INIT_LIST_HEAD(&mp->ackqueue); 238 spin_lock_init(&mp->ackqlock); 239 240 skb_queue_head_init(&mp->inqueue); 241 skb_queue_head_init(&mp->outqueue); 242 243 /* Allocate the least unused minor number. 244 */ 245 write_lock_irqsave(&capiminor_list_lock, flags); 246 if (list_empty(&capiminor_list)) 247 list_add(&mp->list, &capiminor_list); 248 else { 249 list_for_each_entry(p, &capiminor_list, list) { 250 if (p->minor > minor) 251 break; 252 minor++; 253 } 254 255 if (minor < capi_ttyminors) { 256 mp->minor = minor; 257 list_add(&mp->list, p->list.prev); 258 } 259 } 260 write_unlock_irqrestore(&capiminor_list_lock, flags); 261 262 if (!(minor < capi_ttyminors)) { 263 printk(KERN_NOTICE "capi: out of minors\n"); 264 kfree(mp); 265 return NULL; 266 } 267 268 return mp; 269 } 270 271 static void capiminor_free(struct capiminor *mp) 272 { 273 unsigned long flags; 274 275 write_lock_irqsave(&capiminor_list_lock, flags); 276 list_del(&mp->list); 277 write_unlock_irqrestore(&capiminor_list_lock, flags); 278 279 if (mp->ttyskb) kfree_skb(mp->ttyskb); 280 mp->ttyskb = NULL; 281 skb_queue_purge(&mp->inqueue); 282 skb_queue_purge(&mp->outqueue); 283 capiminor_del_all_ack(mp); 284 kfree(mp); 285 } 286 287 static struct capiminor *capiminor_find(unsigned int minor) 288 { 289 struct list_head *l; 290 struct capiminor *p = NULL; 291 292 read_lock(&capiminor_list_lock); 293 list_for_each(l, &capiminor_list) { 294 p = list_entry(l, struct capiminor, list); 295 if (p->minor == minor) 296 break; 297 } 298 read_unlock(&capiminor_list_lock); 299 if (l == &capiminor_list) 300 return NULL; 301 302 return p; 303 } 304 #endif /* CONFIG_ISDN_CAPI_MIDDLEWARE */ 305 306 /* -------- struct capincci ----------------------------------------- */ 307 308 static struct capincci *capincci_alloc(struct capidev *cdev, u32 ncci) 309 { 310 struct capincci *np, **pp; 311 #ifdef CONFIG_ISDN_CAPI_MIDDLEWARE 312 struct capiminor *mp = NULL; 313 #endif /* CONFIG_ISDN_CAPI_MIDDLEWARE */ 314 315 np = kzalloc(sizeof(*np), GFP_ATOMIC); 316 if (!np) 317 return NULL; 318 np->ncci = ncci; 319 np->cdev = cdev; 320 #ifdef CONFIG_ISDN_CAPI_MIDDLEWARE 321 mp = NULL; 322 if (cdev->userflags & CAPIFLAG_HIGHJACKING) 323 mp = np->minorp = capiminor_alloc(&cdev->ap, ncci); 324 if (mp) { 325 mp->nccip = np; 326 #ifdef _DEBUG_REFCOUNT 327 printk(KERN_DEBUG "set mp->nccip\n"); 328 #endif 329 #if defined(CONFIG_ISDN_CAPI_CAPIFS) || defined(CONFIG_ISDN_CAPI_CAPIFS_MODULE) 330 capifs_new_ncci(mp->minor, MKDEV(capi_ttymajor, mp->minor)); 331 #endif 332 } 333 #endif /* CONFIG_ISDN_CAPI_MIDDLEWARE */ 334 for (pp=&cdev->nccis; *pp; pp = &(*pp)->next) 335 ; 336 *pp = np; 337 return np; 338 } 339 340 static void capincci_free(struct capidev *cdev, u32 ncci) 341 { 342 struct capincci *np, **pp; 343 #ifdef CONFIG_ISDN_CAPI_MIDDLEWARE 344 struct capiminor *mp; 345 #endif /* CONFIG_ISDN_CAPI_MIDDLEWARE */ 346 347 pp=&cdev->nccis; 348 while (*pp) { 349 np = *pp; 350 if (ncci == 0xffffffff || np->ncci == ncci) { 351 *pp = (*pp)->next; 352 #ifdef CONFIG_ISDN_CAPI_MIDDLEWARE 353 if ((mp = np->minorp) != 0) { 354 #if defined(CONFIG_ISDN_CAPI_CAPIFS) || defined(CONFIG_ISDN_CAPI_CAPIFS_MODULE) 355 capifs_free_ncci(mp->minor); 356 #endif 357 if (mp->tty) { 358 mp->nccip = NULL; 359 #ifdef _DEBUG_REFCOUNT 360 printk(KERN_DEBUG "reset mp->nccip\n"); 361 #endif 362 tty_hangup(mp->tty); 363 } else { 364 capiminor_free(mp); 365 } 366 } 367 #endif /* CONFIG_ISDN_CAPI_MIDDLEWARE */ 368 kfree(np); 369 if (*pp == 0) return; 370 } else { 371 pp = &(*pp)->next; 372 } 373 } 374 } 375 376 static struct capincci *capincci_find(struct capidev *cdev, u32 ncci) 377 { 378 struct capincci *p; 379 380 for (p=cdev->nccis; p ; p = p->next) { 381 if (p->ncci == ncci) 382 break; 383 } 384 return p; 385 } 386 387 /* -------- struct capidev ------------------------------------------ */ 388 389 static struct capidev *capidev_alloc(void) 390 { 391 struct capidev *cdev; 392 unsigned long flags; 393 394 cdev = kzalloc(sizeof(*cdev), GFP_KERNEL); 395 if (!cdev) 396 return NULL; 397 398 mutex_init(&cdev->ncci_list_mtx); 399 skb_queue_head_init(&cdev->recvqueue); 400 init_waitqueue_head(&cdev->recvwait); 401 write_lock_irqsave(&capidev_list_lock, flags); 402 list_add_tail(&cdev->list, &capidev_list); 403 write_unlock_irqrestore(&capidev_list_lock, flags); 404 return cdev; 405 } 406 407 static void capidev_free(struct capidev *cdev) 408 { 409 unsigned long flags; 410 411 if (cdev->ap.applid) { 412 capi20_release(&cdev->ap); 413 cdev->ap.applid = 0; 414 } 415 skb_queue_purge(&cdev->recvqueue); 416 417 mutex_lock(&cdev->ncci_list_mtx); 418 capincci_free(cdev, 0xffffffff); 419 mutex_unlock(&cdev->ncci_list_mtx); 420 421 write_lock_irqsave(&capidev_list_lock, flags); 422 list_del(&cdev->list); 423 write_unlock_irqrestore(&capidev_list_lock, flags); 424 kfree(cdev); 425 } 426 427 #ifdef CONFIG_ISDN_CAPI_MIDDLEWARE 428 /* -------- handle data queue --------------------------------------- */ 429 430 static struct sk_buff * 431 gen_data_b3_resp_for(struct capiminor *mp, struct sk_buff *skb) 432 { 433 struct sk_buff *nskb; 434 nskb = alloc_skb(CAPI_DATA_B3_RESP_LEN, GFP_ATOMIC); 435 if (nskb) { 436 u16 datahandle = CAPIMSG_U16(skb->data,CAPIMSG_BASELEN+4+4+2); 437 unsigned char *s = skb_put(nskb, CAPI_DATA_B3_RESP_LEN); 438 capimsg_setu16(s, 0, CAPI_DATA_B3_RESP_LEN); 439 capimsg_setu16(s, 2, mp->ap->applid); 440 capimsg_setu8 (s, 4, CAPI_DATA_B3); 441 capimsg_setu8 (s, 5, CAPI_RESP); 442 capimsg_setu16(s, 6, mp->msgid++); 443 capimsg_setu32(s, 8, mp->ncci); 444 capimsg_setu16(s, 12, datahandle); 445 } 446 return nskb; 447 } 448 449 static int handle_recv_skb(struct capiminor *mp, struct sk_buff *skb) 450 { 451 struct sk_buff *nskb; 452 int datalen; 453 u16 errcode, datahandle; 454 struct tty_ldisc *ld; 455 456 datalen = skb->len - CAPIMSG_LEN(skb->data); 457 if (mp->tty == NULL) 458 { 459 #ifdef _DEBUG_DATAFLOW 460 printk(KERN_DEBUG "capi: currently no receiver\n"); 461 #endif 462 return -1; 463 } 464 465 ld = tty_ldisc_ref(mp->tty); 466 if (ld == NULL) 467 return -1; 468 if (ld->receive_buf == NULL) { 469 #if defined(_DEBUG_DATAFLOW) || defined(_DEBUG_TTYFUNCS) 470 printk(KERN_DEBUG "capi: ldisc has no receive_buf function\n"); 471 #endif 472 goto bad; 473 } 474 if (mp->ttyinstop) { 475 #if defined(_DEBUG_DATAFLOW) || defined(_DEBUG_TTYFUNCS) 476 printk(KERN_DEBUG "capi: recv tty throttled\n"); 477 #endif 478 goto bad; 479 } 480 if (mp->tty->receive_room < datalen) { 481 #if defined(_DEBUG_DATAFLOW) || defined(_DEBUG_TTYFUNCS) 482 printk(KERN_DEBUG "capi: no room in tty\n"); 483 #endif 484 goto bad; 485 } 486 if ((nskb = gen_data_b3_resp_for(mp, skb)) == 0) { 487 printk(KERN_ERR "capi: gen_data_b3_resp failed\n"); 488 goto bad; 489 } 490 datahandle = CAPIMSG_U16(skb->data,CAPIMSG_BASELEN+4); 491 errcode = capi20_put_message(mp->ap, nskb); 492 if (errcode != CAPI_NOERROR) { 493 printk(KERN_ERR "capi: send DATA_B3_RESP failed=%x\n", 494 errcode); 495 kfree_skb(nskb); 496 goto bad; 497 } 498 (void)skb_pull(skb, CAPIMSG_LEN(skb->data)); 499 #ifdef _DEBUG_DATAFLOW 500 printk(KERN_DEBUG "capi: DATA_B3_RESP %u len=%d => ldisc\n", 501 datahandle, skb->len); 502 #endif 503 ld->receive_buf(mp->tty, skb->data, NULL, skb->len); 504 kfree_skb(skb); 505 tty_ldisc_deref(ld); 506 return 0; 507 bad: 508 tty_ldisc_deref(ld); 509 return -1; 510 } 511 512 static void handle_minor_recv(struct capiminor *mp) 513 { 514 struct sk_buff *skb; 515 while ((skb = skb_dequeue(&mp->inqueue)) != 0) { 516 unsigned int len = skb->len; 517 mp->inbytes -= len; 518 if (handle_recv_skb(mp, skb) < 0) { 519 skb_queue_head(&mp->inqueue, skb); 520 mp->inbytes += len; 521 return; 522 } 523 } 524 } 525 526 static int handle_minor_send(struct capiminor *mp) 527 { 528 struct sk_buff *skb; 529 u16 len; 530 int count = 0; 531 u16 errcode; 532 u16 datahandle; 533 534 if (mp->tty && mp->ttyoutstop) { 535 #if defined(_DEBUG_DATAFLOW) || defined(_DEBUG_TTYFUNCS) 536 printk(KERN_DEBUG "capi: send: tty stopped\n"); 537 #endif 538 return 0; 539 } 540 541 while ((skb = skb_dequeue(&mp->outqueue)) != 0) { 542 datahandle = mp->datahandle; 543 len = (u16)skb->len; 544 skb_push(skb, CAPI_DATA_B3_REQ_LEN); 545 memset(skb->data, 0, CAPI_DATA_B3_REQ_LEN); 546 capimsg_setu16(skb->data, 0, CAPI_DATA_B3_REQ_LEN); 547 capimsg_setu16(skb->data, 2, mp->ap->applid); 548 capimsg_setu8 (skb->data, 4, CAPI_DATA_B3); 549 capimsg_setu8 (skb->data, 5, CAPI_REQ); 550 capimsg_setu16(skb->data, 6, mp->msgid++); 551 capimsg_setu32(skb->data, 8, mp->ncci); /* NCCI */ 552 capimsg_setu32(skb->data, 12, (u32)(long)skb->data);/* Data32 */ 553 capimsg_setu16(skb->data, 16, len); /* Data length */ 554 capimsg_setu16(skb->data, 18, datahandle); 555 capimsg_setu16(skb->data, 20, 0); /* Flags */ 556 557 if (capincci_add_ack(mp, datahandle) < 0) { 558 skb_pull(skb, CAPI_DATA_B3_REQ_LEN); 559 skb_queue_head(&mp->outqueue, skb); 560 return count; 561 } 562 errcode = capi20_put_message(mp->ap, skb); 563 if (errcode == CAPI_NOERROR) { 564 mp->datahandle++; 565 count++; 566 mp->outbytes -= len; 567 #ifdef _DEBUG_DATAFLOW 568 printk(KERN_DEBUG "capi: DATA_B3_REQ %u len=%u\n", 569 datahandle, len); 570 #endif 571 continue; 572 } 573 capiminor_del_ack(mp, datahandle); 574 575 if (errcode == CAPI_SENDQUEUEFULL) { 576 skb_pull(skb, CAPI_DATA_B3_REQ_LEN); 577 skb_queue_head(&mp->outqueue, skb); 578 break; 579 } 580 581 /* ups, drop packet */ 582 printk(KERN_ERR "capi: put_message = %x\n", errcode); 583 mp->outbytes -= len; 584 kfree_skb(skb); 585 } 586 return count; 587 } 588 589 #endif /* CONFIG_ISDN_CAPI_MIDDLEWARE */ 590 /* -------- function called by lower level -------------------------- */ 591 592 static void capi_recv_message(struct capi20_appl *ap, struct sk_buff *skb) 593 { 594 struct capidev *cdev = ap->private; 595 #ifdef CONFIG_ISDN_CAPI_MIDDLEWARE 596 struct capiminor *mp; 597 u16 datahandle; 598 #endif /* CONFIG_ISDN_CAPI_MIDDLEWARE */ 599 struct capincci *np; 600 u32 ncci; 601 unsigned long flags; 602 603 if (CAPIMSG_CMD(skb->data) == CAPI_CONNECT_B3_CONF) { 604 u16 info = CAPIMSG_U16(skb->data, 12); // Info field 605 if (info == 0) { 606 mutex_lock(&cdev->ncci_list_mtx); 607 capincci_alloc(cdev, CAPIMSG_NCCI(skb->data)); 608 mutex_unlock(&cdev->ncci_list_mtx); 609 } 610 } 611 if (CAPIMSG_CMD(skb->data) == CAPI_CONNECT_B3_IND) { 612 mutex_lock(&cdev->ncci_list_mtx); 613 capincci_alloc(cdev, CAPIMSG_NCCI(skb->data)); 614 mutex_unlock(&cdev->ncci_list_mtx); 615 } 616 spin_lock_irqsave(&workaround_lock, flags); 617 if (CAPIMSG_COMMAND(skb->data) != CAPI_DATA_B3) { 618 skb_queue_tail(&cdev->recvqueue, skb); 619 wake_up_interruptible(&cdev->recvwait); 620 spin_unlock_irqrestore(&workaround_lock, flags); 621 return; 622 } 623 ncci = CAPIMSG_CONTROL(skb->data); 624 for (np = cdev->nccis; np && np->ncci != ncci; np = np->next) 625 ; 626 if (!np) { 627 printk(KERN_ERR "BUG: capi_signal: ncci not found\n"); 628 skb_queue_tail(&cdev->recvqueue, skb); 629 wake_up_interruptible(&cdev->recvwait); 630 spin_unlock_irqrestore(&workaround_lock, flags); 631 return; 632 } 633 #ifndef CONFIG_ISDN_CAPI_MIDDLEWARE 634 skb_queue_tail(&cdev->recvqueue, skb); 635 wake_up_interruptible(&cdev->recvwait); 636 #else /* CONFIG_ISDN_CAPI_MIDDLEWARE */ 637 mp = np->minorp; 638 if (!mp) { 639 skb_queue_tail(&cdev->recvqueue, skb); 640 wake_up_interruptible(&cdev->recvwait); 641 spin_unlock_irqrestore(&workaround_lock, flags); 642 return; 643 } 644 645 646 if (CAPIMSG_SUBCOMMAND(skb->data) == CAPI_IND) { 647 648 datahandle = CAPIMSG_U16(skb->data, CAPIMSG_BASELEN+4+4+2); 649 #ifdef _DEBUG_DATAFLOW 650 printk(KERN_DEBUG "capi_signal: DATA_B3_IND %u len=%d\n", 651 datahandle, skb->len-CAPIMSG_LEN(skb->data)); 652 #endif 653 skb_queue_tail(&mp->inqueue, skb); 654 mp->inbytes += skb->len; 655 handle_minor_recv(mp); 656 657 } else if (CAPIMSG_SUBCOMMAND(skb->data) == CAPI_CONF) { 658 659 datahandle = CAPIMSG_U16(skb->data, CAPIMSG_BASELEN+4); 660 #ifdef _DEBUG_DATAFLOW 661 printk(KERN_DEBUG "capi_signal: DATA_B3_CONF %u 0x%x\n", 662 datahandle, 663 CAPIMSG_U16(skb->data, CAPIMSG_BASELEN+4+2)); 664 #endif 665 kfree_skb(skb); 666 (void)capiminor_del_ack(mp, datahandle); 667 if (mp->tty) 668 tty_wakeup(mp->tty); 669 (void)handle_minor_send(mp); 670 671 } else { 672 /* ups, let capi application handle it :-) */ 673 skb_queue_tail(&cdev->recvqueue, skb); 674 wake_up_interruptible(&cdev->recvwait); 675 } 676 #endif /* CONFIG_ISDN_CAPI_MIDDLEWARE */ 677 spin_unlock_irqrestore(&workaround_lock, flags); 678 } 679 680 /* -------- file_operations for capidev ----------------------------- */ 681 682 static ssize_t 683 capi_read(struct file *file, char __user *buf, size_t count, loff_t *ppos) 684 { 685 struct capidev *cdev = (struct capidev *)file->private_data; 686 struct sk_buff *skb; 687 size_t copied; 688 689 if (!cdev->ap.applid) 690 return -ENODEV; 691 692 if ((skb = skb_dequeue(&cdev->recvqueue)) == 0) { 693 694 if (file->f_flags & O_NONBLOCK) 695 return -EAGAIN; 696 697 for (;;) { 698 interruptible_sleep_on(&cdev->recvwait); 699 if ((skb = skb_dequeue(&cdev->recvqueue)) != 0) 700 break; 701 if (signal_pending(current)) 702 break; 703 } 704 if (skb == 0) 705 return -ERESTARTNOHAND; 706 } 707 if (skb->len > count) { 708 skb_queue_head(&cdev->recvqueue, skb); 709 return -EMSGSIZE; 710 } 711 if (copy_to_user(buf, skb->data, skb->len)) { 712 skb_queue_head(&cdev->recvqueue, skb); 713 return -EFAULT; 714 } 715 copied = skb->len; 716 717 kfree_skb(skb); 718 719 return copied; 720 } 721 722 static ssize_t 723 capi_write(struct file *file, const char __user *buf, size_t count, loff_t *ppos) 724 { 725 struct capidev *cdev = (struct capidev *)file->private_data; 726 struct sk_buff *skb; 727 u16 mlen; 728 729 if (!cdev->ap.applid) 730 return -ENODEV; 731 732 skb = alloc_skb(count, GFP_USER); 733 if (!skb) 734 return -ENOMEM; 735 736 if (copy_from_user(skb_put(skb, count), buf, count)) { 737 kfree_skb(skb); 738 return -EFAULT; 739 } 740 mlen = CAPIMSG_LEN(skb->data); 741 if (CAPIMSG_CMD(skb->data) == CAPI_DATA_B3_REQ) { 742 if ((size_t)(mlen + CAPIMSG_DATALEN(skb->data)) != count) { 743 kfree_skb(skb); 744 return -EINVAL; 745 } 746 } else { 747 if (mlen != count) { 748 kfree_skb(skb); 749 return -EINVAL; 750 } 751 } 752 CAPIMSG_SETAPPID(skb->data, cdev->ap.applid); 753 754 if (CAPIMSG_CMD(skb->data) == CAPI_DISCONNECT_B3_RESP) { 755 mutex_lock(&cdev->ncci_list_mtx); 756 capincci_free(cdev, CAPIMSG_NCCI(skb->data)); 757 mutex_unlock(&cdev->ncci_list_mtx); 758 } 759 760 cdev->errcode = capi20_put_message(&cdev->ap, skb); 761 762 if (cdev->errcode) { 763 kfree_skb(skb); 764 return -EIO; 765 } 766 return count; 767 } 768 769 static unsigned int 770 capi_poll(struct file *file, poll_table * wait) 771 { 772 struct capidev *cdev = (struct capidev *)file->private_data; 773 unsigned int mask = 0; 774 775 if (!cdev->ap.applid) 776 return POLLERR; 777 778 poll_wait(file, &(cdev->recvwait), wait); 779 mask = POLLOUT | POLLWRNORM; 780 if (!skb_queue_empty(&cdev->recvqueue)) 781 mask |= POLLIN | POLLRDNORM; 782 return mask; 783 } 784 785 static int 786 capi_ioctl(struct inode *inode, struct file *file, 787 unsigned int cmd, unsigned long arg) 788 { 789 struct capidev *cdev = file->private_data; 790 struct capi20_appl *ap = &cdev->ap; 791 capi_ioctl_struct data; 792 int retval = -EINVAL; 793 void __user *argp = (void __user *)arg; 794 795 switch (cmd) { 796 case CAPI_REGISTER: 797 { 798 if (ap->applid) 799 return -EEXIST; 800 801 if (copy_from_user(&cdev->ap.rparam, argp, 802 sizeof(struct capi_register_params))) 803 return -EFAULT; 804 805 cdev->ap.private = cdev; 806 cdev->ap.recv_message = capi_recv_message; 807 cdev->errcode = capi20_register(ap); 808 if (cdev->errcode) { 809 ap->applid = 0; 810 return -EIO; 811 } 812 } 813 return (int)ap->applid; 814 815 case CAPI_GET_VERSION: 816 { 817 if (copy_from_user(&data.contr, argp, 818 sizeof(data.contr))) 819 return -EFAULT; 820 cdev->errcode = capi20_get_version(data.contr, &data.version); 821 if (cdev->errcode) 822 return -EIO; 823 if (copy_to_user(argp, &data.version, 824 sizeof(data.version))) 825 return -EFAULT; 826 } 827 return 0; 828 829 case CAPI_GET_SERIAL: 830 { 831 if (copy_from_user(&data.contr, argp, 832 sizeof(data.contr))) 833 return -EFAULT; 834 cdev->errcode = capi20_get_serial (data.contr, data.serial); 835 if (cdev->errcode) 836 return -EIO; 837 if (copy_to_user(argp, data.serial, 838 sizeof(data.serial))) 839 return -EFAULT; 840 } 841 return 0; 842 case CAPI_GET_PROFILE: 843 { 844 if (copy_from_user(&data.contr, argp, 845 sizeof(data.contr))) 846 return -EFAULT; 847 848 if (data.contr == 0) { 849 cdev->errcode = capi20_get_profile(data.contr, &data.profile); 850 if (cdev->errcode) 851 return -EIO; 852 853 retval = copy_to_user(argp, 854 &data.profile.ncontroller, 855 sizeof(data.profile.ncontroller)); 856 857 } else { 858 cdev->errcode = capi20_get_profile(data.contr, &data.profile); 859 if (cdev->errcode) 860 return -EIO; 861 862 retval = copy_to_user(argp, &data.profile, 863 sizeof(data.profile)); 864 } 865 if (retval) 866 return -EFAULT; 867 } 868 return 0; 869 870 case CAPI_GET_MANUFACTURER: 871 { 872 if (copy_from_user(&data.contr, argp, 873 sizeof(data.contr))) 874 return -EFAULT; 875 cdev->errcode = capi20_get_manufacturer(data.contr, data.manufacturer); 876 if (cdev->errcode) 877 return -EIO; 878 879 if (copy_to_user(argp, data.manufacturer, 880 sizeof(data.manufacturer))) 881 return -EFAULT; 882 883 } 884 return 0; 885 case CAPI_GET_ERRCODE: 886 data.errcode = cdev->errcode; 887 cdev->errcode = CAPI_NOERROR; 888 if (arg) { 889 if (copy_to_user(argp, &data.errcode, 890 sizeof(data.errcode))) 891 return -EFAULT; 892 } 893 return data.errcode; 894 895 case CAPI_INSTALLED: 896 if (capi20_isinstalled() == CAPI_NOERROR) 897 return 0; 898 return -ENXIO; 899 900 case CAPI_MANUFACTURER_CMD: 901 { 902 struct capi_manufacturer_cmd mcmd; 903 if (!capable(CAP_SYS_ADMIN)) 904 return -EPERM; 905 if (copy_from_user(&mcmd, argp, sizeof(mcmd))) 906 return -EFAULT; 907 return capi20_manufacturer(mcmd.cmd, mcmd.data); 908 } 909 return 0; 910 911 case CAPI_SET_FLAGS: 912 case CAPI_CLR_FLAGS: 913 { 914 unsigned userflags; 915 if (copy_from_user(&userflags, argp, 916 sizeof(userflags))) 917 return -EFAULT; 918 if (cmd == CAPI_SET_FLAGS) 919 cdev->userflags |= userflags; 920 else 921 cdev->userflags &= ~userflags; 922 } 923 return 0; 924 925 case CAPI_GET_FLAGS: 926 if (copy_to_user(argp, &cdev->userflags, 927 sizeof(cdev->userflags))) 928 return -EFAULT; 929 return 0; 930 931 case CAPI_NCCI_OPENCOUNT: 932 { 933 struct capincci *nccip; 934 #ifdef CONFIG_ISDN_CAPI_MIDDLEWARE 935 struct capiminor *mp; 936 #endif /* CONFIG_ISDN_CAPI_MIDDLEWARE */ 937 unsigned ncci; 938 int count = 0; 939 if (copy_from_user(&ncci, argp, sizeof(ncci))) 940 return -EFAULT; 941 942 mutex_lock(&cdev->ncci_list_mtx); 943 if ((nccip = capincci_find(cdev, (u32) ncci)) == 0) { 944 mutex_unlock(&cdev->ncci_list_mtx); 945 return 0; 946 } 947 #ifdef CONFIG_ISDN_CAPI_MIDDLEWARE 948 if ((mp = nccip->minorp) != 0) { 949 count += atomic_read(&mp->ttyopencount); 950 } 951 #endif /* CONFIG_ISDN_CAPI_MIDDLEWARE */ 952 mutex_unlock(&cdev->ncci_list_mtx); 953 return count; 954 } 955 return 0; 956 957 #ifdef CONFIG_ISDN_CAPI_MIDDLEWARE 958 case CAPI_NCCI_GETUNIT: 959 { 960 struct capincci *nccip; 961 struct capiminor *mp; 962 unsigned ncci; 963 int unit = 0; 964 if (copy_from_user(&ncci, argp, 965 sizeof(ncci))) 966 return -EFAULT; 967 mutex_lock(&cdev->ncci_list_mtx); 968 nccip = capincci_find(cdev, (u32) ncci); 969 if (!nccip || (mp = nccip->minorp) == 0) { 970 mutex_unlock(&cdev->ncci_list_mtx); 971 return -ESRCH; 972 } 973 unit = mp->minor; 974 mutex_unlock(&cdev->ncci_list_mtx); 975 return unit; 976 } 977 return 0; 978 #endif /* CONFIG_ISDN_CAPI_MIDDLEWARE */ 979 } 980 return -EINVAL; 981 } 982 983 static int 984 capi_open(struct inode *inode, struct file *file) 985 { 986 if (file->private_data) 987 return -EEXIST; 988 989 if ((file->private_data = capidev_alloc()) == 0) 990 return -ENOMEM; 991 992 return nonseekable_open(inode, file); 993 } 994 995 static int 996 capi_release(struct inode *inode, struct file *file) 997 { 998 struct capidev *cdev = (struct capidev *)file->private_data; 999 1000 capidev_free(cdev); 1001 file->private_data = NULL; 1002 1003 return 0; 1004 } 1005 1006 static const struct file_operations capi_fops = 1007 { 1008 .owner = THIS_MODULE, 1009 .llseek = no_llseek, 1010 .read = capi_read, 1011 .write = capi_write, 1012 .poll = capi_poll, 1013 .ioctl = capi_ioctl, 1014 .open = capi_open, 1015 .release = capi_release, 1016 }; 1017 1018 #ifdef CONFIG_ISDN_CAPI_MIDDLEWARE 1019 /* -------- tty_operations for capincci ----------------------------- */ 1020 1021 static int capinc_tty_open(struct tty_struct * tty, struct file * file) 1022 { 1023 struct capiminor *mp; 1024 unsigned long flags; 1025 1026 if ((mp = capiminor_find(iminor(file->f_path.dentry->d_inode))) == 0) 1027 return -ENXIO; 1028 if (mp->nccip == 0) 1029 return -ENXIO; 1030 1031 tty->driver_data = (void *)mp; 1032 1033 spin_lock_irqsave(&workaround_lock, flags); 1034 if (atomic_read(&mp->ttyopencount) == 0) 1035 mp->tty = tty; 1036 atomic_inc(&mp->ttyopencount); 1037 #ifdef _DEBUG_REFCOUNT 1038 printk(KERN_DEBUG "capinc_tty_open ocount=%d\n", atomic_read(&mp->ttyopencount)); 1039 #endif 1040 handle_minor_recv(mp); 1041 spin_unlock_irqrestore(&workaround_lock, flags); 1042 return 0; 1043 } 1044 1045 static void capinc_tty_close(struct tty_struct * tty, struct file * file) 1046 { 1047 struct capiminor *mp; 1048 1049 mp = (struct capiminor *)tty->driver_data; 1050 if (mp) { 1051 if (atomic_dec_and_test(&mp->ttyopencount)) { 1052 #ifdef _DEBUG_REFCOUNT 1053 printk(KERN_DEBUG "capinc_tty_close lastclose\n"); 1054 #endif 1055 tty->driver_data = NULL; 1056 mp->tty = NULL; 1057 } 1058 #ifdef _DEBUG_REFCOUNT 1059 printk(KERN_DEBUG "capinc_tty_close ocount=%d\n", atomic_read(&mp->ttyopencount)); 1060 #endif 1061 if (mp->nccip == 0) 1062 capiminor_free(mp); 1063 } 1064 1065 #ifdef _DEBUG_REFCOUNT 1066 printk(KERN_DEBUG "capinc_tty_close\n"); 1067 #endif 1068 } 1069 1070 static int capinc_tty_write(struct tty_struct * tty, 1071 const unsigned char *buf, int count) 1072 { 1073 struct capiminor *mp = (struct capiminor *)tty->driver_data; 1074 struct sk_buff *skb; 1075 unsigned long flags; 1076 1077 #ifdef _DEBUG_TTYFUNCS 1078 printk(KERN_DEBUG "capinc_tty_write(count=%d)\n", count); 1079 #endif 1080 1081 if (!mp || !mp->nccip) { 1082 #ifdef _DEBUG_TTYFUNCS 1083 printk(KERN_DEBUG "capinc_tty_write: mp or mp->ncci NULL\n"); 1084 #endif 1085 return 0; 1086 } 1087 1088 spin_lock_irqsave(&workaround_lock, flags); 1089 skb = mp->ttyskb; 1090 if (skb) { 1091 mp->ttyskb = NULL; 1092 skb_queue_tail(&mp->outqueue, skb); 1093 mp->outbytes += skb->len; 1094 } 1095 1096 skb = alloc_skb(CAPI_DATA_B3_REQ_LEN+count, GFP_ATOMIC); 1097 if (!skb) { 1098 printk(KERN_ERR "capinc_tty_write: alloc_skb failed\n"); 1099 spin_unlock_irqrestore(&workaround_lock, flags); 1100 return -ENOMEM; 1101 } 1102 1103 skb_reserve(skb, CAPI_DATA_B3_REQ_LEN); 1104 memcpy(skb_put(skb, count), buf, count); 1105 1106 skb_queue_tail(&mp->outqueue, skb); 1107 mp->outbytes += skb->len; 1108 (void)handle_minor_send(mp); 1109 (void)handle_minor_recv(mp); 1110 spin_unlock_irqrestore(&workaround_lock, flags); 1111 return count; 1112 } 1113 1114 static void capinc_tty_put_char(struct tty_struct *tty, unsigned char ch) 1115 { 1116 struct capiminor *mp = (struct capiminor *)tty->driver_data; 1117 struct sk_buff *skb; 1118 unsigned long flags; 1119 1120 #ifdef _DEBUG_TTYFUNCS 1121 printk(KERN_DEBUG "capinc_put_char(%u)\n", ch); 1122 #endif 1123 1124 if (!mp || !mp->nccip) { 1125 #ifdef _DEBUG_TTYFUNCS 1126 printk(KERN_DEBUG "capinc_tty_put_char: mp or mp->ncci NULL\n"); 1127 #endif 1128 return; 1129 } 1130 1131 spin_lock_irqsave(&workaround_lock, flags); 1132 skb = mp->ttyskb; 1133 if (skb) { 1134 if (skb_tailroom(skb) > 0) { 1135 *(skb_put(skb, 1)) = ch; 1136 spin_unlock_irqrestore(&workaround_lock, flags); 1137 return; 1138 } 1139 mp->ttyskb = NULL; 1140 skb_queue_tail(&mp->outqueue, skb); 1141 mp->outbytes += skb->len; 1142 (void)handle_minor_send(mp); 1143 } 1144 skb = alloc_skb(CAPI_DATA_B3_REQ_LEN+CAPI_MAX_BLKSIZE, GFP_ATOMIC); 1145 if (skb) { 1146 skb_reserve(skb, CAPI_DATA_B3_REQ_LEN); 1147 *(skb_put(skb, 1)) = ch; 1148 mp->ttyskb = skb; 1149 } else { 1150 printk(KERN_ERR "capinc_put_char: char %u lost\n", ch); 1151 } 1152 spin_unlock_irqrestore(&workaround_lock, flags); 1153 } 1154 1155 static void capinc_tty_flush_chars(struct tty_struct *tty) 1156 { 1157 struct capiminor *mp = (struct capiminor *)tty->driver_data; 1158 struct sk_buff *skb; 1159 unsigned long flags; 1160 1161 #ifdef _DEBUG_TTYFUNCS 1162 printk(KERN_DEBUG "capinc_tty_flush_chars\n"); 1163 #endif 1164 1165 if (!mp || !mp->nccip) { 1166 #ifdef _DEBUG_TTYFUNCS 1167 printk(KERN_DEBUG "capinc_tty_flush_chars: mp or mp->ncci NULL\n"); 1168 #endif 1169 return; 1170 } 1171 1172 spin_lock_irqsave(&workaround_lock, flags); 1173 skb = mp->ttyskb; 1174 if (skb) { 1175 mp->ttyskb = NULL; 1176 skb_queue_tail(&mp->outqueue, skb); 1177 mp->outbytes += skb->len; 1178 (void)handle_minor_send(mp); 1179 } 1180 (void)handle_minor_recv(mp); 1181 spin_unlock_irqrestore(&workaround_lock, flags); 1182 } 1183 1184 static int capinc_tty_write_room(struct tty_struct *tty) 1185 { 1186 struct capiminor *mp = (struct capiminor *)tty->driver_data; 1187 int room; 1188 if (!mp || !mp->nccip) { 1189 #ifdef _DEBUG_TTYFUNCS 1190 printk(KERN_DEBUG "capinc_tty_write_room: mp or mp->ncci NULL\n"); 1191 #endif 1192 return 0; 1193 } 1194 room = CAPINC_MAX_SENDQUEUE-skb_queue_len(&mp->outqueue); 1195 room *= CAPI_MAX_BLKSIZE; 1196 #ifdef _DEBUG_TTYFUNCS 1197 printk(KERN_DEBUG "capinc_tty_write_room = %d\n", room); 1198 #endif 1199 return room; 1200 } 1201 1202 static int capinc_tty_chars_in_buffer(struct tty_struct *tty) 1203 { 1204 struct capiminor *mp = (struct capiminor *)tty->driver_data; 1205 if (!mp || !mp->nccip) { 1206 #ifdef _DEBUG_TTYFUNCS 1207 printk(KERN_DEBUG "capinc_tty_chars_in_buffer: mp or mp->ncci NULL\n"); 1208 #endif 1209 return 0; 1210 } 1211 #ifdef _DEBUG_TTYFUNCS 1212 printk(KERN_DEBUG "capinc_tty_chars_in_buffer = %d nack=%d sq=%d rq=%d\n", 1213 mp->outbytes, mp->nack, 1214 skb_queue_len(&mp->outqueue), 1215 skb_queue_len(&mp->inqueue)); 1216 #endif 1217 return mp->outbytes; 1218 } 1219 1220 static int capinc_tty_ioctl(struct tty_struct *tty, struct file * file, 1221 unsigned int cmd, unsigned long arg) 1222 { 1223 int error = 0; 1224 switch (cmd) { 1225 default: 1226 error = n_tty_ioctl (tty, file, cmd, arg); 1227 break; 1228 } 1229 return error; 1230 } 1231 1232 static void capinc_tty_set_termios(struct tty_struct *tty, struct ktermios * old) 1233 { 1234 #ifdef _DEBUG_TTYFUNCS 1235 printk(KERN_DEBUG "capinc_tty_set_termios\n"); 1236 #endif 1237 } 1238 1239 static void capinc_tty_throttle(struct tty_struct * tty) 1240 { 1241 struct capiminor *mp = (struct capiminor *)tty->driver_data; 1242 #ifdef _DEBUG_TTYFUNCS 1243 printk(KERN_DEBUG "capinc_tty_throttle\n"); 1244 #endif 1245 if (mp) 1246 mp->ttyinstop = 1; 1247 } 1248 1249 static void capinc_tty_unthrottle(struct tty_struct * tty) 1250 { 1251 struct capiminor *mp = (struct capiminor *)tty->driver_data; 1252 unsigned long flags; 1253 #ifdef _DEBUG_TTYFUNCS 1254 printk(KERN_DEBUG "capinc_tty_unthrottle\n"); 1255 #endif 1256 if (mp) { 1257 spin_lock_irqsave(&workaround_lock, flags); 1258 mp->ttyinstop = 0; 1259 handle_minor_recv(mp); 1260 spin_unlock_irqrestore(&workaround_lock, flags); 1261 } 1262 } 1263 1264 static void capinc_tty_stop(struct tty_struct *tty) 1265 { 1266 struct capiminor *mp = (struct capiminor *)tty->driver_data; 1267 #ifdef _DEBUG_TTYFUNCS 1268 printk(KERN_DEBUG "capinc_tty_stop\n"); 1269 #endif 1270 if (mp) { 1271 mp->ttyoutstop = 1; 1272 } 1273 } 1274 1275 static void capinc_tty_start(struct tty_struct *tty) 1276 { 1277 struct capiminor *mp = (struct capiminor *)tty->driver_data; 1278 unsigned long flags; 1279 #ifdef _DEBUG_TTYFUNCS 1280 printk(KERN_DEBUG "capinc_tty_start\n"); 1281 #endif 1282 if (mp) { 1283 spin_lock_irqsave(&workaround_lock, flags); 1284 mp->ttyoutstop = 0; 1285 (void)handle_minor_send(mp); 1286 spin_unlock_irqrestore(&workaround_lock, flags); 1287 } 1288 } 1289 1290 static void capinc_tty_hangup(struct tty_struct *tty) 1291 { 1292 #ifdef _DEBUG_TTYFUNCS 1293 printk(KERN_DEBUG "capinc_tty_hangup\n"); 1294 #endif 1295 } 1296 1297 static void capinc_tty_break_ctl(struct tty_struct *tty, int state) 1298 { 1299 #ifdef _DEBUG_TTYFUNCS 1300 printk(KERN_DEBUG "capinc_tty_break_ctl(%d)\n", state); 1301 #endif 1302 } 1303 1304 static void capinc_tty_flush_buffer(struct tty_struct *tty) 1305 { 1306 #ifdef _DEBUG_TTYFUNCS 1307 printk(KERN_DEBUG "capinc_tty_flush_buffer\n"); 1308 #endif 1309 } 1310 1311 static void capinc_tty_set_ldisc(struct tty_struct *tty) 1312 { 1313 #ifdef _DEBUG_TTYFUNCS 1314 printk(KERN_DEBUG "capinc_tty_set_ldisc\n"); 1315 #endif 1316 } 1317 1318 static void capinc_tty_send_xchar(struct tty_struct *tty, char ch) 1319 { 1320 #ifdef _DEBUG_TTYFUNCS 1321 printk(KERN_DEBUG "capinc_tty_send_xchar(%d)\n", ch); 1322 #endif 1323 } 1324 1325 static int capinc_tty_read_proc(char *page, char **start, off_t off, 1326 int count, int *eof, void *data) 1327 { 1328 return 0; 1329 } 1330 1331 static struct tty_driver *capinc_tty_driver; 1332 1333 static const struct tty_operations capinc_ops = { 1334 .open = capinc_tty_open, 1335 .close = capinc_tty_close, 1336 .write = capinc_tty_write, 1337 .put_char = capinc_tty_put_char, 1338 .flush_chars = capinc_tty_flush_chars, 1339 .write_room = capinc_tty_write_room, 1340 .chars_in_buffer = capinc_tty_chars_in_buffer, 1341 .ioctl = capinc_tty_ioctl, 1342 .set_termios = capinc_tty_set_termios, 1343 .throttle = capinc_tty_throttle, 1344 .unthrottle = capinc_tty_unthrottle, 1345 .stop = capinc_tty_stop, 1346 .start = capinc_tty_start, 1347 .hangup = capinc_tty_hangup, 1348 .break_ctl = capinc_tty_break_ctl, 1349 .flush_buffer = capinc_tty_flush_buffer, 1350 .set_ldisc = capinc_tty_set_ldisc, 1351 .send_xchar = capinc_tty_send_xchar, 1352 .read_proc = capinc_tty_read_proc, 1353 }; 1354 1355 static int capinc_tty_init(void) 1356 { 1357 struct tty_driver *drv; 1358 1359 if (capi_ttyminors > CAPINC_MAX_PORTS) 1360 capi_ttyminors = CAPINC_MAX_PORTS; 1361 if (capi_ttyminors <= 0) 1362 capi_ttyminors = CAPINC_NR_PORTS; 1363 1364 drv = alloc_tty_driver(capi_ttyminors); 1365 if (!drv) 1366 return -ENOMEM; 1367 1368 drv->owner = THIS_MODULE; 1369 drv->driver_name = "capi_nc"; 1370 drv->name = "capi"; 1371 drv->major = capi_ttymajor; 1372 drv->minor_start = 0; 1373 drv->type = TTY_DRIVER_TYPE_SERIAL; 1374 drv->subtype = SERIAL_TYPE_NORMAL; 1375 drv->init_termios = tty_std_termios; 1376 drv->init_termios.c_iflag = ICRNL; 1377 drv->init_termios.c_oflag = OPOST | ONLCR; 1378 drv->init_termios.c_cflag = B9600 | CS8 | CREAD | HUPCL | CLOCAL; 1379 drv->init_termios.c_lflag = 0; 1380 drv->flags = TTY_DRIVER_REAL_RAW|TTY_DRIVER_RESET_TERMIOS; 1381 tty_set_operations(drv, &capinc_ops); 1382 if (tty_register_driver(drv)) { 1383 put_tty_driver(drv); 1384 printk(KERN_ERR "Couldn't register capi_nc driver\n"); 1385 return -1; 1386 } 1387 capinc_tty_driver = drv; 1388 return 0; 1389 } 1390 1391 static void capinc_tty_exit(void) 1392 { 1393 struct tty_driver *drv = capinc_tty_driver; 1394 int retval; 1395 if ((retval = tty_unregister_driver(drv))) 1396 printk(KERN_ERR "capi: failed to unregister capi_nc driver (%d)\n", retval); 1397 put_tty_driver(drv); 1398 } 1399 1400 #endif /* CONFIG_ISDN_CAPI_MIDDLEWARE */ 1401 1402 /* -------- /proc functions ----------------------------------------- */ 1403 1404 /* 1405 * /proc/capi/capi20: 1406 * minor applid nrecvctlpkt nrecvdatapkt nsendctlpkt nsenddatapkt 1407 */ 1408 static int proc_capidev_read_proc(char *page, char **start, off_t off, 1409 int count, int *eof, void *data) 1410 { 1411 struct capidev *cdev; 1412 struct list_head *l; 1413 int len = 0; 1414 1415 read_lock(&capidev_list_lock); 1416 list_for_each(l, &capidev_list) { 1417 cdev = list_entry(l, struct capidev, list); 1418 len += sprintf(page+len, "0 %d %lu %lu %lu %lu\n", 1419 cdev->ap.applid, 1420 cdev->ap.nrecvctlpkt, 1421 cdev->ap.nrecvdatapkt, 1422 cdev->ap.nsentctlpkt, 1423 cdev->ap.nsentdatapkt); 1424 if (len <= off) { 1425 off -= len; 1426 len = 0; 1427 } else { 1428 if (len-off > count) 1429 goto endloop; 1430 } 1431 } 1432 1433 endloop: 1434 read_unlock(&capidev_list_lock); 1435 if (len < count) 1436 *eof = 1; 1437 if (len > count) len = count; 1438 if (len < 0) len = 0; 1439 return len; 1440 } 1441 1442 /* 1443 * /proc/capi/capi20ncci: 1444 * applid ncci 1445 */ 1446 static int proc_capincci_read_proc(char *page, char **start, off_t off, 1447 int count, int *eof, void *data) 1448 { 1449 struct capidev *cdev; 1450 struct capincci *np; 1451 struct list_head *l; 1452 int len = 0; 1453 1454 read_lock(&capidev_list_lock); 1455 list_for_each(l, &capidev_list) { 1456 cdev = list_entry(l, struct capidev, list); 1457 for (np=cdev->nccis; np; np = np->next) { 1458 len += sprintf(page+len, "%d 0x%x\n", 1459 cdev->ap.applid, 1460 np->ncci); 1461 if (len <= off) { 1462 off -= len; 1463 len = 0; 1464 } else { 1465 if (len-off > count) 1466 goto endloop; 1467 } 1468 } 1469 } 1470 endloop: 1471 read_unlock(&capidev_list_lock); 1472 *start = page+off; 1473 if (len < count) 1474 *eof = 1; 1475 if (len>count) len = count; 1476 if (len<0) len = 0; 1477 return len; 1478 } 1479 1480 static struct procfsentries { 1481 char *name; 1482 mode_t mode; 1483 int (*read_proc)(char *page, char **start, off_t off, 1484 int count, int *eof, void *data); 1485 struct proc_dir_entry *procent; 1486 } procfsentries[] = { 1487 /* { "capi", S_IFDIR, 0 }, */ 1488 { "capi/capi20", 0 , proc_capidev_read_proc }, 1489 { "capi/capi20ncci", 0 , proc_capincci_read_proc }, 1490 }; 1491 1492 static void __init proc_init(void) 1493 { 1494 int nelem = ARRAY_SIZE(procfsentries); 1495 int i; 1496 1497 for (i=0; i < nelem; i++) { 1498 struct procfsentries *p = procfsentries + i; 1499 p->procent = create_proc_entry(p->name, p->mode, NULL); 1500 if (p->procent) p->procent->read_proc = p->read_proc; 1501 } 1502 } 1503 1504 static void __exit proc_exit(void) 1505 { 1506 int nelem = ARRAY_SIZE(procfsentries); 1507 int i; 1508 1509 for (i=nelem-1; i >= 0; i--) { 1510 struct procfsentries *p = procfsentries + i; 1511 if (p->procent) { 1512 remove_proc_entry(p->name, NULL); 1513 p->procent = NULL; 1514 } 1515 } 1516 } 1517 1518 /* -------- init function and module interface ---------------------- */ 1519 1520 1521 static char rev[32]; 1522 1523 static int __init capi_init(void) 1524 { 1525 char *p; 1526 char *compileinfo; 1527 int major_ret; 1528 1529 if ((p = strchr(revision, ':')) != 0 && p[1]) { 1530 strlcpy(rev, p + 2, sizeof(rev)); 1531 if ((p = strchr(rev, '$')) != 0 && p > rev) 1532 *(p-1) = 0; 1533 } else 1534 strcpy(rev, "1.0"); 1535 1536 major_ret = register_chrdev(capi_major, "capi20", &capi_fops); 1537 if (major_ret < 0) { 1538 printk(KERN_ERR "capi20: unable to get major %d\n", capi_major); 1539 return major_ret; 1540 } 1541 capi_class = class_create(THIS_MODULE, "capi"); 1542 if (IS_ERR(capi_class)) { 1543 unregister_chrdev(capi_major, "capi20"); 1544 return PTR_ERR(capi_class); 1545 } 1546 1547 class_device_create(capi_class, NULL, MKDEV(capi_major, 0), NULL, "capi"); 1548 1549 #ifdef CONFIG_ISDN_CAPI_MIDDLEWARE 1550 if (capinc_tty_init() < 0) { 1551 class_device_destroy(capi_class, MKDEV(capi_major, 0)); 1552 class_destroy(capi_class); 1553 unregister_chrdev(capi_major, "capi20"); 1554 return -ENOMEM; 1555 } 1556 #endif /* CONFIG_ISDN_CAPI_MIDDLEWARE */ 1557 1558 proc_init(); 1559 1560 #ifdef CONFIG_ISDN_CAPI_MIDDLEWARE 1561 #if defined(CONFIG_ISDN_CAPI_CAPIFS) || defined(CONFIG_ISDN_CAPI_CAPIFS_MODULE) 1562 compileinfo = " (middleware+capifs)"; 1563 #else 1564 compileinfo = " (no capifs)"; 1565 #endif 1566 #else 1567 compileinfo = " (no middleware)"; 1568 #endif 1569 printk(KERN_NOTICE "capi20: Rev %s: started up with major %d%s\n", 1570 rev, capi_major, compileinfo); 1571 1572 return 0; 1573 } 1574 1575 static void __exit capi_exit(void) 1576 { 1577 proc_exit(); 1578 1579 class_device_destroy(capi_class, MKDEV(capi_major, 0)); 1580 class_destroy(capi_class); 1581 unregister_chrdev(capi_major, "capi20"); 1582 1583 #ifdef CONFIG_ISDN_CAPI_MIDDLEWARE 1584 capinc_tty_exit(); 1585 #endif 1586 printk(KERN_NOTICE "capi: Rev %s: unloaded\n", rev); 1587 } 1588 1589 module_init(capi_init); 1590 module_exit(capi_exit); 1591