1 /* $Id: plip.c,v 1.3.6.2 1997/04/16 15:07:56 phil Exp $ */ 2 /* PLIP: A parallel port "network" driver for Linux. */ 3 /* This driver is for parallel port with 5-bit cable (LapLink (R) cable). */ 4 /* 5 * Authors: Donald Becker <becker@scyld.com> 6 * Tommy Thorn <thorn@daimi.aau.dk> 7 * Tanabe Hiroyasu <hiro@sanpo.t.u-tokyo.ac.jp> 8 * Alan Cox <gw4pts@gw4pts.ampr.org> 9 * Peter Bauer <100136.3530@compuserve.com> 10 * Niibe Yutaka <gniibe@mri.co.jp> 11 * Nimrod Zimerman <zimerman@mailandnews.com> 12 * 13 * Enhancements: 14 * Modularization and ifreq/ifmap support by Alan Cox. 15 * Rewritten by Niibe Yutaka. 16 * parport-sharing awareness code by Philip Blundell. 17 * SMP locking by Niibe Yutaka. 18 * Support for parallel ports with no IRQ (poll mode), 19 * Modifications to use the parallel port API 20 * by Nimrod Zimerman. 21 * 22 * Fixes: 23 * Niibe Yutaka 24 * - Module initialization. 25 * - MTU fix. 26 * - Make sure other end is OK, before sending a packet. 27 * - Fix immediate timer problem. 28 * 29 * Al Viro 30 * - Changed {enable,disable}_irq handling to make it work 31 * with new ("stack") semantics. 32 * 33 * This program is free software; you can redistribute it and/or 34 * modify it under the terms of the GNU General Public License 35 * as published by the Free Software Foundation; either version 36 * 2 of the License, or (at your option) any later version. 37 */ 38 39 /* 40 * Original version and the name 'PLIP' from Donald Becker <becker@scyld.com> 41 * inspired by Russ Nelson's parallel port packet driver. 42 * 43 * NOTE: 44 * Tanabe Hiroyasu had changed the protocol, and it was in Linux v1.0. 45 * Because of the necessity to communicate to DOS machines with the 46 * Crynwr packet driver, Peter Bauer changed the protocol again 47 * back to original protocol. 48 * 49 * This version follows original PLIP protocol. 50 * So, this PLIP can't communicate the PLIP of Linux v1.0. 51 */ 52 53 /* 54 * To use with DOS box, please do (Turn on ARP switch): 55 * # ifconfig plip[0-2] arp 56 */ 57 static const char version[] = "NET3 PLIP version 2.4-parport gniibe@mri.co.jp\n"; 58 59 /* 60 Sources: 61 Ideas and protocols came from Russ Nelson's <nelson@crynwr.com> 62 "parallel.asm" parallel port packet driver. 63 64 The "Crynwr" parallel port standard specifies the following protocol: 65 Trigger by sending nibble '0x8' (this causes interrupt on other end) 66 count-low octet 67 count-high octet 68 ... data octets 69 checksum octet 70 Each octet is sent as <wait for rx. '0x1?'> <send 0x10+(octet&0x0F)> 71 <wait for rx. '0x0?'> <send 0x00+((octet>>4)&0x0F)> 72 73 The packet is encapsulated as if it were ethernet. 74 75 The cable used is a de facto standard parallel null cable -- sold as 76 a "LapLink" cable by various places. You'll need a 12-conductor cable to 77 make one yourself. The wiring is: 78 SLCTIN 17 - 17 79 GROUND 25 - 25 80 D0->ERROR 2 - 15 15 - 2 81 D1->SLCT 3 - 13 13 - 3 82 D2->PAPOUT 4 - 12 12 - 4 83 D3->ACK 5 - 10 10 - 5 84 D4->BUSY 6 - 11 11 - 6 85 Do not connect the other pins. They are 86 D5,D6,D7 are 7,8,9 87 STROBE is 1, FEED is 14, INIT is 16 88 extra grounds are 18,19,20,21,22,23,24 89 */ 90 91 #include <linux/module.h> 92 #include <linux/kernel.h> 93 #include <linux/types.h> 94 #include <linux/fcntl.h> 95 #include <linux/interrupt.h> 96 #include <linux/string.h> 97 #include <linux/slab.h> 98 #include <linux/if_ether.h> 99 #include <linux/in.h> 100 #include <linux/errno.h> 101 #include <linux/delay.h> 102 #include <linux/init.h> 103 #include <linux/netdevice.h> 104 #include <linux/etherdevice.h> 105 #include <linux/inetdevice.h> 106 #include <linux/skbuff.h> 107 #include <linux/if_plip.h> 108 #include <linux/workqueue.h> 109 #include <linux/spinlock.h> 110 #include <linux/completion.h> 111 #include <linux/parport.h> 112 #include <linux/bitops.h> 113 114 #include <net/neighbour.h> 115 116 #include <asm/irq.h> 117 #include <asm/byteorder.h> 118 119 /* Maximum number of devices to support. */ 120 #define PLIP_MAX 8 121 122 /* Use 0 for production, 1 for verification, >2 for debug */ 123 #ifndef NET_DEBUG 124 #define NET_DEBUG 1 125 #endif 126 static const unsigned int net_debug = NET_DEBUG; 127 128 #define ENABLE(irq) if (irq != -1) enable_irq(irq) 129 #define DISABLE(irq) if (irq != -1) disable_irq(irq) 130 131 /* In micro second */ 132 #define PLIP_DELAY_UNIT 1 133 134 /* Connection time out = PLIP_TRIGGER_WAIT * PLIP_DELAY_UNIT usec */ 135 #define PLIP_TRIGGER_WAIT 500 136 137 /* Nibble time out = PLIP_NIBBLE_WAIT * PLIP_DELAY_UNIT usec */ 138 #define PLIP_NIBBLE_WAIT 3000 139 140 /* Bottom halves */ 141 static void plip_kick_bh(struct work_struct *work); 142 static void plip_bh(struct work_struct *work); 143 static void plip_timer_bh(struct work_struct *work); 144 145 /* Interrupt handler */ 146 static void plip_interrupt(void *dev_id); 147 148 /* Functions for DEV methods */ 149 static int plip_tx_packet(struct sk_buff *skb, struct net_device *dev); 150 static int plip_hard_header(struct sk_buff *skb, struct net_device *dev, 151 unsigned short type, const void *daddr, 152 const void *saddr, unsigned len); 153 static int plip_hard_header_cache(const struct neighbour *neigh, 154 struct hh_cache *hh, __be16 type); 155 static int plip_open(struct net_device *dev); 156 static int plip_close(struct net_device *dev); 157 static int plip_ioctl(struct net_device *dev, struct ifreq *ifr, int cmd); 158 static int plip_preempt(void *handle); 159 static void plip_wakeup(void *handle); 160 161 enum plip_connection_state { 162 PLIP_CN_NONE=0, 163 PLIP_CN_RECEIVE, 164 PLIP_CN_SEND, 165 PLIP_CN_CLOSING, 166 PLIP_CN_ERROR 167 }; 168 169 enum plip_packet_state { 170 PLIP_PK_DONE=0, 171 PLIP_PK_TRIGGER, 172 PLIP_PK_LENGTH_LSB, 173 PLIP_PK_LENGTH_MSB, 174 PLIP_PK_DATA, 175 PLIP_PK_CHECKSUM 176 }; 177 178 enum plip_nibble_state { 179 PLIP_NB_BEGIN, 180 PLIP_NB_1, 181 PLIP_NB_2, 182 }; 183 184 struct plip_local { 185 enum plip_packet_state state; 186 enum plip_nibble_state nibble; 187 union { 188 struct { 189 #if defined(__LITTLE_ENDIAN) 190 unsigned char lsb; 191 unsigned char msb; 192 #elif defined(__BIG_ENDIAN) 193 unsigned char msb; 194 unsigned char lsb; 195 #else 196 #error "Please fix the endianness defines in <asm/byteorder.h>" 197 #endif 198 } b; 199 unsigned short h; 200 } length; 201 unsigned short byte; 202 unsigned char checksum; 203 unsigned char data; 204 struct sk_buff *skb; 205 }; 206 207 struct net_local { 208 struct net_device *dev; 209 struct work_struct immediate; 210 struct delayed_work deferred; 211 struct delayed_work timer; 212 struct plip_local snd_data; 213 struct plip_local rcv_data; 214 struct pardevice *pardev; 215 unsigned long trigger; 216 unsigned long nibble; 217 enum plip_connection_state connection; 218 unsigned short timeout_count; 219 int is_deferred; 220 int port_owner; 221 int should_relinquish; 222 spinlock_t lock; 223 atomic_t kill_timer; 224 struct completion killed_timer_cmp; 225 }; 226 227 static inline void enable_parport_interrupts (struct net_device *dev) 228 { 229 if (dev->irq != -1) 230 { 231 struct parport *port = 232 ((struct net_local *)netdev_priv(dev))->pardev->port; 233 port->ops->enable_irq (port); 234 } 235 } 236 237 static inline void disable_parport_interrupts (struct net_device *dev) 238 { 239 if (dev->irq != -1) 240 { 241 struct parport *port = 242 ((struct net_local *)netdev_priv(dev))->pardev->port; 243 port->ops->disable_irq (port); 244 } 245 } 246 247 static inline void write_data (struct net_device *dev, unsigned char data) 248 { 249 struct parport *port = 250 ((struct net_local *)netdev_priv(dev))->pardev->port; 251 252 port->ops->write_data (port, data); 253 } 254 255 static inline unsigned char read_status (struct net_device *dev) 256 { 257 struct parport *port = 258 ((struct net_local *)netdev_priv(dev))->pardev->port; 259 260 return port->ops->read_status (port); 261 } 262 263 static const struct header_ops plip_header_ops = { 264 .create = plip_hard_header, 265 .cache = plip_hard_header_cache, 266 }; 267 268 static const struct net_device_ops plip_netdev_ops = { 269 .ndo_open = plip_open, 270 .ndo_stop = plip_close, 271 .ndo_start_xmit = plip_tx_packet, 272 .ndo_do_ioctl = plip_ioctl, 273 .ndo_set_mac_address = eth_mac_addr, 274 .ndo_validate_addr = eth_validate_addr, 275 }; 276 277 /* Entry point of PLIP driver. 278 Probe the hardware, and register/initialize the driver. 279 280 PLIP is rather weird, because of the way it interacts with the parport 281 system. It is _not_ initialised from Space.c. Instead, plip_init() 282 is called, and that function makes up a "struct net_device" for each port, and 283 then calls us here. 284 285 */ 286 static void 287 plip_init_netdev(struct net_device *dev) 288 { 289 struct net_local *nl = netdev_priv(dev); 290 291 /* Then, override parts of it */ 292 dev->tx_queue_len = 10; 293 dev->flags = IFF_POINTOPOINT|IFF_NOARP; 294 memset(dev->dev_addr, 0xfc, ETH_ALEN); 295 296 dev->netdev_ops = &plip_netdev_ops; 297 dev->header_ops = &plip_header_ops; 298 299 300 nl->port_owner = 0; 301 302 /* Initialize constants */ 303 nl->trigger = PLIP_TRIGGER_WAIT; 304 nl->nibble = PLIP_NIBBLE_WAIT; 305 306 /* Initialize task queue structures */ 307 INIT_WORK(&nl->immediate, plip_bh); 308 INIT_DELAYED_WORK(&nl->deferred, plip_kick_bh); 309 310 if (dev->irq == -1) 311 INIT_DELAYED_WORK(&nl->timer, plip_timer_bh); 312 313 spin_lock_init(&nl->lock); 314 } 315 316 /* Bottom half handler for the delayed request. 317 This routine is kicked by do_timer(). 318 Request `plip_bh' to be invoked. */ 319 static void 320 plip_kick_bh(struct work_struct *work) 321 { 322 struct net_local *nl = 323 container_of(work, struct net_local, deferred.work); 324 325 if (nl->is_deferred) 326 schedule_work(&nl->immediate); 327 } 328 329 /* Forward declarations of internal routines */ 330 static int plip_none(struct net_device *, struct net_local *, 331 struct plip_local *, struct plip_local *); 332 static int plip_receive_packet(struct net_device *, struct net_local *, 333 struct plip_local *, struct plip_local *); 334 static int plip_send_packet(struct net_device *, struct net_local *, 335 struct plip_local *, struct plip_local *); 336 static int plip_connection_close(struct net_device *, struct net_local *, 337 struct plip_local *, struct plip_local *); 338 static int plip_error(struct net_device *, struct net_local *, 339 struct plip_local *, struct plip_local *); 340 static int plip_bh_timeout_error(struct net_device *dev, struct net_local *nl, 341 struct plip_local *snd, 342 struct plip_local *rcv, 343 int error); 344 345 #define OK 0 346 #define TIMEOUT 1 347 #define ERROR 2 348 #define HS_TIMEOUT 3 349 350 typedef int (*plip_func)(struct net_device *dev, struct net_local *nl, 351 struct plip_local *snd, struct plip_local *rcv); 352 353 static const plip_func connection_state_table[] = 354 { 355 plip_none, 356 plip_receive_packet, 357 plip_send_packet, 358 plip_connection_close, 359 plip_error 360 }; 361 362 /* Bottom half handler of PLIP. */ 363 static void 364 plip_bh(struct work_struct *work) 365 { 366 struct net_local *nl = container_of(work, struct net_local, immediate); 367 struct plip_local *snd = &nl->snd_data; 368 struct plip_local *rcv = &nl->rcv_data; 369 plip_func f; 370 int r; 371 372 nl->is_deferred = 0; 373 f = connection_state_table[nl->connection]; 374 if ((r = (*f)(nl->dev, nl, snd, rcv)) != OK && 375 (r = plip_bh_timeout_error(nl->dev, nl, snd, rcv, r)) != OK) { 376 nl->is_deferred = 1; 377 schedule_delayed_work(&nl->deferred, 1); 378 } 379 } 380 381 static void 382 plip_timer_bh(struct work_struct *work) 383 { 384 struct net_local *nl = 385 container_of(work, struct net_local, timer.work); 386 387 if (!(atomic_read (&nl->kill_timer))) { 388 plip_interrupt (nl->dev); 389 390 schedule_delayed_work(&nl->timer, 1); 391 } 392 else { 393 complete(&nl->killed_timer_cmp); 394 } 395 } 396 397 static int 398 plip_bh_timeout_error(struct net_device *dev, struct net_local *nl, 399 struct plip_local *snd, struct plip_local *rcv, 400 int error) 401 { 402 unsigned char c0; 403 /* 404 * This is tricky. If we got here from the beginning of send (either 405 * with ERROR or HS_TIMEOUT) we have IRQ enabled. Otherwise it's 406 * already disabled. With the old variant of {enable,disable}_irq() 407 * extra disable_irq() was a no-op. Now it became mortal - it's 408 * unbalanced and thus we'll never re-enable IRQ (until rmmod plip, 409 * that is). So we have to treat HS_TIMEOUT and ERROR from send 410 * in a special way. 411 */ 412 413 spin_lock_irq(&nl->lock); 414 if (nl->connection == PLIP_CN_SEND) { 415 416 if (error != ERROR) { /* Timeout */ 417 nl->timeout_count++; 418 if ((error == HS_TIMEOUT && nl->timeout_count <= 10) || 419 nl->timeout_count <= 3) { 420 spin_unlock_irq(&nl->lock); 421 /* Try again later */ 422 return TIMEOUT; 423 } 424 c0 = read_status(dev); 425 printk(KERN_WARNING "%s: transmit timeout(%d,%02x)\n", 426 dev->name, snd->state, c0); 427 } else 428 error = HS_TIMEOUT; 429 dev->stats.tx_errors++; 430 dev->stats.tx_aborted_errors++; 431 } else if (nl->connection == PLIP_CN_RECEIVE) { 432 if (rcv->state == PLIP_PK_TRIGGER) { 433 /* Transmission was interrupted. */ 434 spin_unlock_irq(&nl->lock); 435 return OK; 436 } 437 if (error != ERROR) { /* Timeout */ 438 if (++nl->timeout_count <= 3) { 439 spin_unlock_irq(&nl->lock); 440 /* Try again later */ 441 return TIMEOUT; 442 } 443 c0 = read_status(dev); 444 printk(KERN_WARNING "%s: receive timeout(%d,%02x)\n", 445 dev->name, rcv->state, c0); 446 } 447 dev->stats.rx_dropped++; 448 } 449 rcv->state = PLIP_PK_DONE; 450 if (rcv->skb) { 451 kfree_skb(rcv->skb); 452 rcv->skb = NULL; 453 } 454 snd->state = PLIP_PK_DONE; 455 if (snd->skb) { 456 dev_kfree_skb(snd->skb); 457 snd->skb = NULL; 458 } 459 spin_unlock_irq(&nl->lock); 460 if (error == HS_TIMEOUT) { 461 DISABLE(dev->irq); 462 synchronize_irq(dev->irq); 463 } 464 disable_parport_interrupts (dev); 465 netif_stop_queue (dev); 466 nl->connection = PLIP_CN_ERROR; 467 write_data (dev, 0x00); 468 469 return TIMEOUT; 470 } 471 472 static int 473 plip_none(struct net_device *dev, struct net_local *nl, 474 struct plip_local *snd, struct plip_local *rcv) 475 { 476 return OK; 477 } 478 479 /* PLIP_RECEIVE --- receive a byte(two nibbles) 480 Returns OK on success, TIMEOUT on timeout */ 481 static inline int 482 plip_receive(unsigned short nibble_timeout, struct net_device *dev, 483 enum plip_nibble_state *ns_p, unsigned char *data_p) 484 { 485 unsigned char c0, c1; 486 unsigned int cx; 487 488 switch (*ns_p) { 489 case PLIP_NB_BEGIN: 490 cx = nibble_timeout; 491 while (1) { 492 c0 = read_status(dev); 493 udelay(PLIP_DELAY_UNIT); 494 if ((c0 & 0x80) == 0) { 495 c1 = read_status(dev); 496 if (c0 == c1) 497 break; 498 } 499 if (--cx == 0) 500 return TIMEOUT; 501 } 502 *data_p = (c0 >> 3) & 0x0f; 503 write_data (dev, 0x10); /* send ACK */ 504 *ns_p = PLIP_NB_1; 505 506 case PLIP_NB_1: 507 cx = nibble_timeout; 508 while (1) { 509 c0 = read_status(dev); 510 udelay(PLIP_DELAY_UNIT); 511 if (c0 & 0x80) { 512 c1 = read_status(dev); 513 if (c0 == c1) 514 break; 515 } 516 if (--cx == 0) 517 return TIMEOUT; 518 } 519 *data_p |= (c0 << 1) & 0xf0; 520 write_data (dev, 0x00); /* send ACK */ 521 *ns_p = PLIP_NB_BEGIN; 522 case PLIP_NB_2: 523 break; 524 } 525 return OK; 526 } 527 528 /* 529 * Determine the packet's protocol ID. The rule here is that we 530 * assume 802.3 if the type field is short enough to be a length. 531 * This is normal practice and works for any 'now in use' protocol. 532 * 533 * PLIP is ethernet ish but the daddr might not be valid if unicast. 534 * PLIP fortunately has no bus architecture (its Point-to-point). 535 * 536 * We can't fix the daddr thing as that quirk (more bug) is embedded 537 * in far too many old systems not all even running Linux. 538 */ 539 540 static __be16 plip_type_trans(struct sk_buff *skb, struct net_device *dev) 541 { 542 struct ethhdr *eth; 543 unsigned char *rawp; 544 545 skb_reset_mac_header(skb); 546 skb_pull(skb,dev->hard_header_len); 547 eth = eth_hdr(skb); 548 549 if(is_multicast_ether_addr(eth->h_dest)) 550 { 551 if(ether_addr_equal_64bits(eth->h_dest, dev->broadcast)) 552 skb->pkt_type=PACKET_BROADCAST; 553 else 554 skb->pkt_type=PACKET_MULTICAST; 555 } 556 557 /* 558 * This ALLMULTI check should be redundant by 1.4 559 * so don't forget to remove it. 560 */ 561 562 if (ntohs(eth->h_proto) >= ETH_P_802_3_MIN) 563 return eth->h_proto; 564 565 rawp = skb->data; 566 567 /* 568 * This is a magic hack to spot IPX packets. Older Novell breaks 569 * the protocol design and runs IPX over 802.3 without an 802.2 LLC 570 * layer. We look for FFFF which isn't a used 802.2 SSAP/DSAP. This 571 * won't work for fault tolerant netware but does for the rest. 572 */ 573 if (*(unsigned short *)rawp == 0xFFFF) 574 return htons(ETH_P_802_3); 575 576 /* 577 * Real 802.2 LLC 578 */ 579 return htons(ETH_P_802_2); 580 } 581 582 /* PLIP_RECEIVE_PACKET --- receive a packet */ 583 static int 584 plip_receive_packet(struct net_device *dev, struct net_local *nl, 585 struct plip_local *snd, struct plip_local *rcv) 586 { 587 unsigned short nibble_timeout = nl->nibble; 588 unsigned char *lbuf; 589 590 switch (rcv->state) { 591 case PLIP_PK_TRIGGER: 592 DISABLE(dev->irq); 593 /* Don't need to synchronize irq, as we can safely ignore it */ 594 disable_parport_interrupts (dev); 595 write_data (dev, 0x01); /* send ACK */ 596 if (net_debug > 2) 597 printk(KERN_DEBUG "%s: receive start\n", dev->name); 598 rcv->state = PLIP_PK_LENGTH_LSB; 599 rcv->nibble = PLIP_NB_BEGIN; 600 601 case PLIP_PK_LENGTH_LSB: 602 if (snd->state != PLIP_PK_DONE) { 603 if (plip_receive(nl->trigger, dev, 604 &rcv->nibble, &rcv->length.b.lsb)) { 605 /* collision, here dev->tbusy == 1 */ 606 rcv->state = PLIP_PK_DONE; 607 nl->is_deferred = 1; 608 nl->connection = PLIP_CN_SEND; 609 schedule_delayed_work(&nl->deferred, 1); 610 enable_parport_interrupts (dev); 611 ENABLE(dev->irq); 612 return OK; 613 } 614 } else { 615 if (plip_receive(nibble_timeout, dev, 616 &rcv->nibble, &rcv->length.b.lsb)) 617 return TIMEOUT; 618 } 619 rcv->state = PLIP_PK_LENGTH_MSB; 620 621 case PLIP_PK_LENGTH_MSB: 622 if (plip_receive(nibble_timeout, dev, 623 &rcv->nibble, &rcv->length.b.msb)) 624 return TIMEOUT; 625 if (rcv->length.h > dev->mtu + dev->hard_header_len || 626 rcv->length.h < 8) { 627 printk(KERN_WARNING "%s: bogus packet size %d.\n", dev->name, rcv->length.h); 628 return ERROR; 629 } 630 /* Malloc up new buffer. */ 631 rcv->skb = dev_alloc_skb(rcv->length.h + 2); 632 if (rcv->skb == NULL) { 633 printk(KERN_ERR "%s: Memory squeeze.\n", dev->name); 634 return ERROR; 635 } 636 skb_reserve(rcv->skb, 2); /* Align IP on 16 byte boundaries */ 637 skb_put(rcv->skb,rcv->length.h); 638 rcv->skb->dev = dev; 639 rcv->state = PLIP_PK_DATA; 640 rcv->byte = 0; 641 rcv->checksum = 0; 642 643 case PLIP_PK_DATA: 644 lbuf = rcv->skb->data; 645 do { 646 if (plip_receive(nibble_timeout, dev, 647 &rcv->nibble, &lbuf[rcv->byte])) 648 return TIMEOUT; 649 } while (++rcv->byte < rcv->length.h); 650 do { 651 rcv->checksum += lbuf[--rcv->byte]; 652 } while (rcv->byte); 653 rcv->state = PLIP_PK_CHECKSUM; 654 655 case PLIP_PK_CHECKSUM: 656 if (plip_receive(nibble_timeout, dev, 657 &rcv->nibble, &rcv->data)) 658 return TIMEOUT; 659 if (rcv->data != rcv->checksum) { 660 dev->stats.rx_crc_errors++; 661 if (net_debug) 662 printk(KERN_DEBUG "%s: checksum error\n", dev->name); 663 return ERROR; 664 } 665 rcv->state = PLIP_PK_DONE; 666 667 case PLIP_PK_DONE: 668 /* Inform the upper layer for the arrival of a packet. */ 669 rcv->skb->protocol=plip_type_trans(rcv->skb, dev); 670 netif_rx_ni(rcv->skb); 671 dev->stats.rx_bytes += rcv->length.h; 672 dev->stats.rx_packets++; 673 rcv->skb = NULL; 674 if (net_debug > 2) 675 printk(KERN_DEBUG "%s: receive end\n", dev->name); 676 677 /* Close the connection. */ 678 write_data (dev, 0x00); 679 spin_lock_irq(&nl->lock); 680 if (snd->state != PLIP_PK_DONE) { 681 nl->connection = PLIP_CN_SEND; 682 spin_unlock_irq(&nl->lock); 683 schedule_work(&nl->immediate); 684 enable_parport_interrupts (dev); 685 ENABLE(dev->irq); 686 return OK; 687 } else { 688 nl->connection = PLIP_CN_NONE; 689 spin_unlock_irq(&nl->lock); 690 enable_parport_interrupts (dev); 691 ENABLE(dev->irq); 692 return OK; 693 } 694 } 695 return OK; 696 } 697 698 /* PLIP_SEND --- send a byte (two nibbles) 699 Returns OK on success, TIMEOUT when timeout */ 700 static inline int 701 plip_send(unsigned short nibble_timeout, struct net_device *dev, 702 enum plip_nibble_state *ns_p, unsigned char data) 703 { 704 unsigned char c0; 705 unsigned int cx; 706 707 switch (*ns_p) { 708 case PLIP_NB_BEGIN: 709 write_data (dev, data & 0x0f); 710 *ns_p = PLIP_NB_1; 711 712 case PLIP_NB_1: 713 write_data (dev, 0x10 | (data & 0x0f)); 714 cx = nibble_timeout; 715 while (1) { 716 c0 = read_status(dev); 717 if ((c0 & 0x80) == 0) 718 break; 719 if (--cx == 0) 720 return TIMEOUT; 721 udelay(PLIP_DELAY_UNIT); 722 } 723 write_data (dev, 0x10 | (data >> 4)); 724 *ns_p = PLIP_NB_2; 725 726 case PLIP_NB_2: 727 write_data (dev, (data >> 4)); 728 cx = nibble_timeout; 729 while (1) { 730 c0 = read_status(dev); 731 if (c0 & 0x80) 732 break; 733 if (--cx == 0) 734 return TIMEOUT; 735 udelay(PLIP_DELAY_UNIT); 736 } 737 *ns_p = PLIP_NB_BEGIN; 738 return OK; 739 } 740 return OK; 741 } 742 743 /* PLIP_SEND_PACKET --- send a packet */ 744 static int 745 plip_send_packet(struct net_device *dev, struct net_local *nl, 746 struct plip_local *snd, struct plip_local *rcv) 747 { 748 unsigned short nibble_timeout = nl->nibble; 749 unsigned char *lbuf; 750 unsigned char c0; 751 unsigned int cx; 752 753 if (snd->skb == NULL || (lbuf = snd->skb->data) == NULL) { 754 printk(KERN_DEBUG "%s: send skb lost\n", dev->name); 755 snd->state = PLIP_PK_DONE; 756 snd->skb = NULL; 757 return ERROR; 758 } 759 760 switch (snd->state) { 761 case PLIP_PK_TRIGGER: 762 if ((read_status(dev) & 0xf8) != 0x80) 763 return HS_TIMEOUT; 764 765 /* Trigger remote rx interrupt. */ 766 write_data (dev, 0x08); 767 cx = nl->trigger; 768 while (1) { 769 udelay(PLIP_DELAY_UNIT); 770 spin_lock_irq(&nl->lock); 771 if (nl->connection == PLIP_CN_RECEIVE) { 772 spin_unlock_irq(&nl->lock); 773 /* Interrupted. */ 774 dev->stats.collisions++; 775 return OK; 776 } 777 c0 = read_status(dev); 778 if (c0 & 0x08) { 779 spin_unlock_irq(&nl->lock); 780 DISABLE(dev->irq); 781 synchronize_irq(dev->irq); 782 if (nl->connection == PLIP_CN_RECEIVE) { 783 /* Interrupted. 784 We don't need to enable irq, 785 as it is soon disabled. */ 786 /* Yes, we do. New variant of 787 {enable,disable}_irq *counts* 788 them. -- AV */ 789 ENABLE(dev->irq); 790 dev->stats.collisions++; 791 return OK; 792 } 793 disable_parport_interrupts (dev); 794 if (net_debug > 2) 795 printk(KERN_DEBUG "%s: send start\n", dev->name); 796 snd->state = PLIP_PK_LENGTH_LSB; 797 snd->nibble = PLIP_NB_BEGIN; 798 nl->timeout_count = 0; 799 break; 800 } 801 spin_unlock_irq(&nl->lock); 802 if (--cx == 0) { 803 write_data (dev, 0x00); 804 return HS_TIMEOUT; 805 } 806 } 807 808 case PLIP_PK_LENGTH_LSB: 809 if (plip_send(nibble_timeout, dev, 810 &snd->nibble, snd->length.b.lsb)) 811 return TIMEOUT; 812 snd->state = PLIP_PK_LENGTH_MSB; 813 814 case PLIP_PK_LENGTH_MSB: 815 if (plip_send(nibble_timeout, dev, 816 &snd->nibble, snd->length.b.msb)) 817 return TIMEOUT; 818 snd->state = PLIP_PK_DATA; 819 snd->byte = 0; 820 snd->checksum = 0; 821 822 case PLIP_PK_DATA: 823 do { 824 if (plip_send(nibble_timeout, dev, 825 &snd->nibble, lbuf[snd->byte])) 826 return TIMEOUT; 827 } while (++snd->byte < snd->length.h); 828 do { 829 snd->checksum += lbuf[--snd->byte]; 830 } while (snd->byte); 831 snd->state = PLIP_PK_CHECKSUM; 832 833 case PLIP_PK_CHECKSUM: 834 if (plip_send(nibble_timeout, dev, 835 &snd->nibble, snd->checksum)) 836 return TIMEOUT; 837 838 dev->stats.tx_bytes += snd->skb->len; 839 dev_kfree_skb(snd->skb); 840 dev->stats.tx_packets++; 841 snd->state = PLIP_PK_DONE; 842 843 case PLIP_PK_DONE: 844 /* Close the connection */ 845 write_data (dev, 0x00); 846 snd->skb = NULL; 847 if (net_debug > 2) 848 printk(KERN_DEBUG "%s: send end\n", dev->name); 849 nl->connection = PLIP_CN_CLOSING; 850 nl->is_deferred = 1; 851 schedule_delayed_work(&nl->deferred, 1); 852 enable_parport_interrupts (dev); 853 ENABLE(dev->irq); 854 return OK; 855 } 856 return OK; 857 } 858 859 static int 860 plip_connection_close(struct net_device *dev, struct net_local *nl, 861 struct plip_local *snd, struct plip_local *rcv) 862 { 863 spin_lock_irq(&nl->lock); 864 if (nl->connection == PLIP_CN_CLOSING) { 865 nl->connection = PLIP_CN_NONE; 866 netif_wake_queue (dev); 867 } 868 spin_unlock_irq(&nl->lock); 869 if (nl->should_relinquish) { 870 nl->should_relinquish = nl->port_owner = 0; 871 parport_release(nl->pardev); 872 } 873 return OK; 874 } 875 876 /* PLIP_ERROR --- wait till other end settled */ 877 static int 878 plip_error(struct net_device *dev, struct net_local *nl, 879 struct plip_local *snd, struct plip_local *rcv) 880 { 881 unsigned char status; 882 883 status = read_status(dev); 884 if ((status & 0xf8) == 0x80) { 885 if (net_debug > 2) 886 printk(KERN_DEBUG "%s: reset interface.\n", dev->name); 887 nl->connection = PLIP_CN_NONE; 888 nl->should_relinquish = 0; 889 netif_start_queue (dev); 890 enable_parport_interrupts (dev); 891 ENABLE(dev->irq); 892 netif_wake_queue (dev); 893 } else { 894 nl->is_deferred = 1; 895 schedule_delayed_work(&nl->deferred, 1); 896 } 897 898 return OK; 899 } 900 901 /* Handle the parallel port interrupts. */ 902 static void 903 plip_interrupt(void *dev_id) 904 { 905 struct net_device *dev = dev_id; 906 struct net_local *nl; 907 struct plip_local *rcv; 908 unsigned char c0; 909 unsigned long flags; 910 911 nl = netdev_priv(dev); 912 rcv = &nl->rcv_data; 913 914 spin_lock_irqsave (&nl->lock, flags); 915 916 c0 = read_status(dev); 917 if ((c0 & 0xf8) != 0xc0) { 918 if ((dev->irq != -1) && (net_debug > 1)) 919 printk(KERN_DEBUG "%s: spurious interrupt\n", dev->name); 920 spin_unlock_irqrestore (&nl->lock, flags); 921 return; 922 } 923 924 if (net_debug > 3) 925 printk(KERN_DEBUG "%s: interrupt.\n", dev->name); 926 927 switch (nl->connection) { 928 case PLIP_CN_CLOSING: 929 netif_wake_queue (dev); 930 case PLIP_CN_NONE: 931 case PLIP_CN_SEND: 932 rcv->state = PLIP_PK_TRIGGER; 933 nl->connection = PLIP_CN_RECEIVE; 934 nl->timeout_count = 0; 935 schedule_work(&nl->immediate); 936 break; 937 938 case PLIP_CN_RECEIVE: 939 /* May occur because there is race condition 940 around test and set of dev->interrupt. 941 Ignore this interrupt. */ 942 break; 943 944 case PLIP_CN_ERROR: 945 printk(KERN_ERR "%s: receive interrupt in error state\n", dev->name); 946 break; 947 } 948 949 spin_unlock_irqrestore(&nl->lock, flags); 950 } 951 952 static int 953 plip_tx_packet(struct sk_buff *skb, struct net_device *dev) 954 { 955 struct net_local *nl = netdev_priv(dev); 956 struct plip_local *snd = &nl->snd_data; 957 958 if (netif_queue_stopped(dev)) 959 return NETDEV_TX_BUSY; 960 961 /* We may need to grab the bus */ 962 if (!nl->port_owner) { 963 if (parport_claim(nl->pardev)) 964 return NETDEV_TX_BUSY; 965 nl->port_owner = 1; 966 } 967 968 netif_stop_queue (dev); 969 970 if (skb->len > dev->mtu + dev->hard_header_len) { 971 printk(KERN_WARNING "%s: packet too big, %d.\n", dev->name, (int)skb->len); 972 netif_start_queue (dev); 973 return NETDEV_TX_BUSY; 974 } 975 976 if (net_debug > 2) 977 printk(KERN_DEBUG "%s: send request\n", dev->name); 978 979 spin_lock_irq(&nl->lock); 980 snd->skb = skb; 981 snd->length.h = skb->len; 982 snd->state = PLIP_PK_TRIGGER; 983 if (nl->connection == PLIP_CN_NONE) { 984 nl->connection = PLIP_CN_SEND; 985 nl->timeout_count = 0; 986 } 987 schedule_work(&nl->immediate); 988 spin_unlock_irq(&nl->lock); 989 990 return NETDEV_TX_OK; 991 } 992 993 static void 994 plip_rewrite_address(const struct net_device *dev, struct ethhdr *eth) 995 { 996 const struct in_device *in_dev; 997 998 rcu_read_lock(); 999 in_dev = __in_dev_get_rcu(dev); 1000 if (in_dev) { 1001 /* Any address will do - we take the first */ 1002 const struct in_ifaddr *ifa = in_dev->ifa_list; 1003 if (ifa) { 1004 memcpy(eth->h_source, dev->dev_addr, ETH_ALEN); 1005 memset(eth->h_dest, 0xfc, 2); 1006 memcpy(eth->h_dest+2, &ifa->ifa_address, 4); 1007 } 1008 } 1009 rcu_read_unlock(); 1010 } 1011 1012 static int 1013 plip_hard_header(struct sk_buff *skb, struct net_device *dev, 1014 unsigned short type, const void *daddr, 1015 const void *saddr, unsigned len) 1016 { 1017 int ret; 1018 1019 ret = eth_header(skb, dev, type, daddr, saddr, len); 1020 if (ret >= 0) 1021 plip_rewrite_address (dev, (struct ethhdr *)skb->data); 1022 1023 return ret; 1024 } 1025 1026 static int plip_hard_header_cache(const struct neighbour *neigh, 1027 struct hh_cache *hh, __be16 type) 1028 { 1029 int ret; 1030 1031 ret = eth_header_cache(neigh, hh, type); 1032 if (ret == 0) { 1033 struct ethhdr *eth; 1034 1035 eth = (struct ethhdr*)(((u8*)hh->hh_data) + 1036 HH_DATA_OFF(sizeof(*eth))); 1037 plip_rewrite_address (neigh->dev, eth); 1038 } 1039 1040 return ret; 1041 } 1042 1043 /* Open/initialize the board. This is called (in the current kernel) 1044 sometime after booting when the 'ifconfig' program is run. 1045 1046 This routine gets exclusive access to the parallel port by allocating 1047 its IRQ line. 1048 */ 1049 static int 1050 plip_open(struct net_device *dev) 1051 { 1052 struct net_local *nl = netdev_priv(dev); 1053 struct in_device *in_dev; 1054 1055 /* Grab the port */ 1056 if (!nl->port_owner) { 1057 if (parport_claim(nl->pardev)) return -EAGAIN; 1058 nl->port_owner = 1; 1059 } 1060 1061 nl->should_relinquish = 0; 1062 1063 /* Clear the data port. */ 1064 write_data (dev, 0x00); 1065 1066 /* Enable rx interrupt. */ 1067 enable_parport_interrupts (dev); 1068 if (dev->irq == -1) 1069 { 1070 atomic_set (&nl->kill_timer, 0); 1071 schedule_delayed_work(&nl->timer, 1); 1072 } 1073 1074 /* Initialize the state machine. */ 1075 nl->rcv_data.state = nl->snd_data.state = PLIP_PK_DONE; 1076 nl->rcv_data.skb = nl->snd_data.skb = NULL; 1077 nl->connection = PLIP_CN_NONE; 1078 nl->is_deferred = 0; 1079 1080 /* Fill in the MAC-level header. 1081 We used to abuse dev->broadcast to store the point-to-point 1082 MAC address, but we no longer do it. Instead, we fetch the 1083 interface address whenever it is needed, which is cheap enough 1084 because we use the hh_cache. Actually, abusing dev->broadcast 1085 didn't work, because when using plip_open the point-to-point 1086 address isn't yet known. 1087 PLIP doesn't have a real MAC address, but we need it to be 1088 DOS compatible, and to properly support taps (otherwise, 1089 when the device address isn't identical to the address of a 1090 received frame, the kernel incorrectly drops it). */ 1091 1092 in_dev=__in_dev_get_rtnl(dev); 1093 if (in_dev) { 1094 /* Any address will do - we take the first. We already 1095 have the first two bytes filled with 0xfc, from 1096 plip_init_dev(). */ 1097 struct in_ifaddr *ifa=in_dev->ifa_list; 1098 if (ifa != NULL) { 1099 memcpy(dev->dev_addr+2, &ifa->ifa_local, 4); 1100 } 1101 } 1102 1103 netif_start_queue (dev); 1104 1105 return 0; 1106 } 1107 1108 /* The inverse routine to plip_open (). */ 1109 static int 1110 plip_close(struct net_device *dev) 1111 { 1112 struct net_local *nl = netdev_priv(dev); 1113 struct plip_local *snd = &nl->snd_data; 1114 struct plip_local *rcv = &nl->rcv_data; 1115 1116 netif_stop_queue (dev); 1117 DISABLE(dev->irq); 1118 synchronize_irq(dev->irq); 1119 1120 if (dev->irq == -1) 1121 { 1122 init_completion(&nl->killed_timer_cmp); 1123 atomic_set (&nl->kill_timer, 1); 1124 wait_for_completion(&nl->killed_timer_cmp); 1125 } 1126 1127 #ifdef NOTDEF 1128 outb(0x00, PAR_DATA(dev)); 1129 #endif 1130 nl->is_deferred = 0; 1131 nl->connection = PLIP_CN_NONE; 1132 if (nl->port_owner) { 1133 parport_release(nl->pardev); 1134 nl->port_owner = 0; 1135 } 1136 1137 snd->state = PLIP_PK_DONE; 1138 if (snd->skb) { 1139 dev_kfree_skb(snd->skb); 1140 snd->skb = NULL; 1141 } 1142 rcv->state = PLIP_PK_DONE; 1143 if (rcv->skb) { 1144 kfree_skb(rcv->skb); 1145 rcv->skb = NULL; 1146 } 1147 1148 #ifdef NOTDEF 1149 /* Reset. */ 1150 outb(0x00, PAR_CONTROL(dev)); 1151 #endif 1152 return 0; 1153 } 1154 1155 static int 1156 plip_preempt(void *handle) 1157 { 1158 struct net_device *dev = (struct net_device *)handle; 1159 struct net_local *nl = netdev_priv(dev); 1160 1161 /* Stand our ground if a datagram is on the wire */ 1162 if (nl->connection != PLIP_CN_NONE) { 1163 nl->should_relinquish = 1; 1164 return 1; 1165 } 1166 1167 nl->port_owner = 0; /* Remember that we released the bus */ 1168 return 0; 1169 } 1170 1171 static void 1172 plip_wakeup(void *handle) 1173 { 1174 struct net_device *dev = (struct net_device *)handle; 1175 struct net_local *nl = netdev_priv(dev); 1176 1177 if (nl->port_owner) { 1178 /* Why are we being woken up? */ 1179 printk(KERN_DEBUG "%s: why am I being woken up?\n", dev->name); 1180 if (!parport_claim(nl->pardev)) 1181 /* bus_owner is already set (but why?) */ 1182 printk(KERN_DEBUG "%s: I'm broken.\n", dev->name); 1183 else 1184 return; 1185 } 1186 1187 if (!(dev->flags & IFF_UP)) 1188 /* Don't need the port when the interface is down */ 1189 return; 1190 1191 if (!parport_claim(nl->pardev)) { 1192 nl->port_owner = 1; 1193 /* Clear the data port. */ 1194 write_data (dev, 0x00); 1195 } 1196 } 1197 1198 static int 1199 plip_ioctl(struct net_device *dev, struct ifreq *rq, int cmd) 1200 { 1201 struct net_local *nl = netdev_priv(dev); 1202 struct plipconf *pc = (struct plipconf *) &rq->ifr_ifru; 1203 1204 if (cmd != SIOCDEVPLIP) 1205 return -EOPNOTSUPP; 1206 1207 switch(pc->pcmd) { 1208 case PLIP_GET_TIMEOUT: 1209 pc->trigger = nl->trigger; 1210 pc->nibble = nl->nibble; 1211 break; 1212 case PLIP_SET_TIMEOUT: 1213 if(!capable(CAP_NET_ADMIN)) 1214 return -EPERM; 1215 nl->trigger = pc->trigger; 1216 nl->nibble = pc->nibble; 1217 break; 1218 default: 1219 return -EOPNOTSUPP; 1220 } 1221 return 0; 1222 } 1223 1224 static int parport[PLIP_MAX] = { [0 ... PLIP_MAX-1] = -1 }; 1225 static int timid; 1226 1227 module_param_array(parport, int, NULL, 0); 1228 module_param(timid, int, 0); 1229 MODULE_PARM_DESC(parport, "List of parport device numbers to use by plip"); 1230 1231 static struct net_device *dev_plip[PLIP_MAX] = { NULL, }; 1232 1233 static inline int 1234 plip_searchfor(int list[], int a) 1235 { 1236 int i; 1237 for (i = 0; i < PLIP_MAX && list[i] != -1; i++) { 1238 if (list[i] == a) return 1; 1239 } 1240 return 0; 1241 } 1242 1243 /* plip_attach() is called (by the parport code) when a port is 1244 * available to use. */ 1245 static void plip_attach (struct parport *port) 1246 { 1247 static int unit; 1248 struct net_device *dev; 1249 struct net_local *nl; 1250 char name[IFNAMSIZ]; 1251 struct pardev_cb plip_cb; 1252 1253 if ((parport[0] == -1 && (!timid || !port->devices)) || 1254 plip_searchfor(parport, port->number)) { 1255 if (unit == PLIP_MAX) { 1256 printk(KERN_ERR "plip: too many devices\n"); 1257 return; 1258 } 1259 1260 sprintf(name, "plip%d", unit); 1261 dev = alloc_etherdev(sizeof(struct net_local)); 1262 if (!dev) 1263 return; 1264 1265 strcpy(dev->name, name); 1266 1267 dev->irq = port->irq; 1268 dev->base_addr = port->base; 1269 if (port->irq == -1) { 1270 printk(KERN_INFO "plip: %s has no IRQ. Using IRQ-less mode," 1271 "which is fairly inefficient!\n", port->name); 1272 } 1273 1274 nl = netdev_priv(dev); 1275 nl->dev = dev; 1276 1277 memset(&plip_cb, 0, sizeof(plip_cb)); 1278 plip_cb.private = dev; 1279 plip_cb.preempt = plip_preempt; 1280 plip_cb.wakeup = plip_wakeup; 1281 plip_cb.irq_func = plip_interrupt; 1282 1283 nl->pardev = parport_register_dev_model(port, dev->name, 1284 &plip_cb, unit); 1285 1286 if (!nl->pardev) { 1287 printk(KERN_ERR "%s: parport_register failed\n", name); 1288 goto err_free_dev; 1289 } 1290 1291 plip_init_netdev(dev); 1292 1293 if (register_netdev(dev)) { 1294 printk(KERN_ERR "%s: network register failed\n", name); 1295 goto err_parport_unregister; 1296 } 1297 1298 printk(KERN_INFO "%s", version); 1299 if (dev->irq != -1) 1300 printk(KERN_INFO "%s: Parallel port at %#3lx, " 1301 "using IRQ %d.\n", 1302 dev->name, dev->base_addr, dev->irq); 1303 else 1304 printk(KERN_INFO "%s: Parallel port at %#3lx, " 1305 "not using IRQ.\n", 1306 dev->name, dev->base_addr); 1307 dev_plip[unit++] = dev; 1308 } 1309 return; 1310 1311 err_parport_unregister: 1312 parport_unregister_device(nl->pardev); 1313 err_free_dev: 1314 free_netdev(dev); 1315 } 1316 1317 /* plip_detach() is called (by the parport code) when a port is 1318 * no longer available to use. */ 1319 static void plip_detach (struct parport *port) 1320 { 1321 /* Nothing to do */ 1322 } 1323 1324 static int plip_probe(struct pardevice *par_dev) 1325 { 1326 struct device_driver *drv = par_dev->dev.driver; 1327 int len = strlen(drv->name); 1328 1329 if (strncmp(par_dev->name, drv->name, len)) 1330 return -ENODEV; 1331 1332 return 0; 1333 } 1334 1335 static struct parport_driver plip_driver = { 1336 .name = "plip", 1337 .probe = plip_probe, 1338 .match_port = plip_attach, 1339 .detach = plip_detach, 1340 .devmodel = true, 1341 }; 1342 1343 static void __exit plip_cleanup_module (void) 1344 { 1345 struct net_device *dev; 1346 int i; 1347 1348 for (i=0; i < PLIP_MAX; i++) { 1349 if ((dev = dev_plip[i])) { 1350 struct net_local *nl = netdev_priv(dev); 1351 unregister_netdev(dev); 1352 if (nl->port_owner) 1353 parport_release(nl->pardev); 1354 parport_unregister_device(nl->pardev); 1355 free_netdev(dev); 1356 dev_plip[i] = NULL; 1357 } 1358 } 1359 1360 parport_unregister_driver(&plip_driver); 1361 } 1362 1363 #ifndef MODULE 1364 1365 static int parport_ptr; 1366 1367 static int __init plip_setup(char *str) 1368 { 1369 int ints[4]; 1370 1371 str = get_options(str, ARRAY_SIZE(ints), ints); 1372 1373 /* Ugh. */ 1374 if (!strncmp(str, "parport", 7)) { 1375 int n = simple_strtoul(str+7, NULL, 10); 1376 if (parport_ptr < PLIP_MAX) 1377 parport[parport_ptr++] = n; 1378 else 1379 printk(KERN_INFO "plip: too many ports, %s ignored.\n", 1380 str); 1381 } else if (!strcmp(str, "timid")) { 1382 timid = 1; 1383 } else { 1384 if (ints[0] == 0 || ints[1] == 0) { 1385 /* disable driver on "plip=" or "plip=0" */ 1386 parport[0] = -2; 1387 } else { 1388 printk(KERN_WARNING "warning: 'plip=0x%x' ignored\n", 1389 ints[1]); 1390 } 1391 } 1392 return 1; 1393 } 1394 1395 __setup("plip=", plip_setup); 1396 1397 #endif /* !MODULE */ 1398 1399 static int __init plip_init (void) 1400 { 1401 if (parport[0] == -2) 1402 return 0; 1403 1404 if (parport[0] != -1 && timid) { 1405 printk(KERN_WARNING "plip: warning, ignoring `timid' since specific ports given.\n"); 1406 timid = 0; 1407 } 1408 1409 if (parport_register_driver (&plip_driver)) { 1410 printk (KERN_WARNING "plip: couldn't register driver\n"); 1411 return 1; 1412 } 1413 1414 return 0; 1415 } 1416 1417 module_init(plip_init); 1418 module_exit(plip_cleanup_module); 1419 MODULE_LICENSE("GPL"); 1420