1 /* 2 * linux/drivers/char/ppdev.c 3 * 4 * This is the code behind /dev/parport* -- it allows a user-space 5 * application to use the parport subsystem. 6 * 7 * Copyright (C) 1998-2000, 2002 Tim Waugh <tim@cyberelk.net> 8 * 9 * This program is free software; you can redistribute it and/or 10 * modify it under the terms of the GNU General Public License 11 * as published by the Free Software Foundation; either version 12 * 2 of the License, or (at your option) any later version. 13 * 14 * A /dev/parportx device node represents an arbitrary device 15 * on port 'x'. The following operations are possible: 16 * 17 * open do nothing, set up default IEEE 1284 protocol to be COMPAT 18 * close release port and unregister device (if necessary) 19 * ioctl 20 * EXCL register device exclusively (may fail) 21 * CLAIM (register device first time) parport_claim_or_block 22 * RELEASE parport_release 23 * SETMODE set the IEEE 1284 protocol to use for read/write 24 * SETPHASE set the IEEE 1284 phase of a particular mode. Not to be 25 * confused with ioctl(fd, SETPHASER, &stun). ;-) 26 * DATADIR data_forward / data_reverse 27 * WDATA write_data 28 * RDATA read_data 29 * WCONTROL write_control 30 * RCONTROL read_control 31 * FCONTROL frob_control 32 * RSTATUS read_status 33 * NEGOT parport_negotiate 34 * YIELD parport_yield_blocking 35 * WCTLONIRQ on interrupt, set control lines 36 * CLRIRQ clear (and return) interrupt count 37 * SETTIME sets device timeout (struct timeval) 38 * GETTIME gets device timeout (struct timeval) 39 * GETMODES gets hardware supported modes (unsigned int) 40 * GETMODE gets the current IEEE1284 mode 41 * GETPHASE gets the current IEEE1284 phase 42 * GETFLAGS gets current (user-visible) flags 43 * SETFLAGS sets current (user-visible) flags 44 * read/write read or write in current IEEE 1284 protocol 45 * select wait for interrupt (in readfds) 46 * 47 * Changes: 48 * Added SETTIME/GETTIME ioctl, Fred Barnes, 1999. 49 * 50 * Arnaldo Carvalho de Melo <acme@conectiva.com.br> 2000/08/25 51 * - On error, copy_from_user and copy_to_user do not return -EFAULT, 52 * They return the positive number of bytes *not* copied due to address 53 * space errors. 54 * 55 * Added GETMODES/GETMODE/GETPHASE ioctls, Fred Barnes <frmb2@ukc.ac.uk>, 03/01/2001. 56 * Added GETFLAGS/SETFLAGS ioctls, Fred Barnes, 04/2001 57 */ 58 59 #include <linux/module.h> 60 #include <linux/init.h> 61 #include <linux/sched.h> 62 #include <linux/device.h> 63 #include <linux/ioctl.h> 64 #include <linux/parport.h> 65 #include <linux/ctype.h> 66 #include <linux/poll.h> 67 #include <linux/slab.h> 68 #include <linux/major.h> 69 #include <linux/ppdev.h> 70 #include <linux/mutex.h> 71 #include <linux/uaccess.h> 72 #include <linux/compat.h> 73 74 #define PP_VERSION "ppdev: user-space parallel port driver" 75 #define CHRDEV "ppdev" 76 77 struct pp_struct { 78 struct pardevice *pdev; 79 wait_queue_head_t irq_wait; 80 atomic_t irqc; 81 unsigned int flags; 82 int irqresponse; 83 unsigned char irqctl; 84 struct ieee1284_info state; 85 struct ieee1284_info saved_state; 86 long default_inactivity; 87 }; 88 89 /* pp_struct.flags bitfields */ 90 #define PP_CLAIMED (1<<0) 91 #define PP_EXCL (1<<1) 92 93 /* Other constants */ 94 #define PP_INTERRUPT_TIMEOUT (10 * HZ) /* 10s */ 95 #define PP_BUFFER_SIZE 1024 96 #define PARDEVICE_MAX 8 97 98 /* ROUND_UP macro from fs/select.c */ 99 #define ROUND_UP(x,y) (((x)+(y)-1)/(y)) 100 101 static DEFINE_MUTEX(pp_do_mutex); 102 103 /* define fixed sized ioctl cmd for y2038 migration */ 104 #define PPGETTIME32 _IOR(PP_IOCTL, 0x95, s32[2]) 105 #define PPSETTIME32 _IOW(PP_IOCTL, 0x96, s32[2]) 106 #define PPGETTIME64 _IOR(PP_IOCTL, 0x95, s64[2]) 107 #define PPSETTIME64 _IOW(PP_IOCTL, 0x96, s64[2]) 108 109 static inline void pp_enable_irq(struct pp_struct *pp) 110 { 111 struct parport *port = pp->pdev->port; 112 113 port->ops->enable_irq(port); 114 } 115 116 static ssize_t pp_read(struct file *file, char __user *buf, size_t count, 117 loff_t *ppos) 118 { 119 unsigned int minor = iminor(file_inode(file)); 120 struct pp_struct *pp = file->private_data; 121 char *kbuffer; 122 ssize_t bytes_read = 0; 123 struct parport *pport; 124 int mode; 125 126 if (!(pp->flags & PP_CLAIMED)) { 127 /* Don't have the port claimed */ 128 pr_debug(CHRDEV "%x: claim the port first\n", minor); 129 return -EINVAL; 130 } 131 132 /* Trivial case. */ 133 if (count == 0) 134 return 0; 135 136 kbuffer = kmalloc(min_t(size_t, count, PP_BUFFER_SIZE), GFP_KERNEL); 137 if (!kbuffer) 138 return -ENOMEM; 139 pport = pp->pdev->port; 140 mode = pport->ieee1284.mode & ~(IEEE1284_DEVICEID | IEEE1284_ADDR); 141 142 parport_set_timeout(pp->pdev, 143 (file->f_flags & O_NONBLOCK) ? 144 PARPORT_INACTIVITY_O_NONBLOCK : 145 pp->default_inactivity); 146 147 while (bytes_read == 0) { 148 ssize_t need = min_t(unsigned long, count, PP_BUFFER_SIZE); 149 150 if (mode == IEEE1284_MODE_EPP) { 151 /* various specials for EPP mode */ 152 int flags = 0; 153 size_t (*fn)(struct parport *, void *, size_t, int); 154 155 if (pp->flags & PP_W91284PIC) 156 flags |= PARPORT_W91284PIC; 157 if (pp->flags & PP_FASTREAD) 158 flags |= PARPORT_EPP_FAST; 159 if (pport->ieee1284.mode & IEEE1284_ADDR) 160 fn = pport->ops->epp_read_addr; 161 else 162 fn = pport->ops->epp_read_data; 163 bytes_read = (*fn)(pport, kbuffer, need, flags); 164 } else { 165 bytes_read = parport_read(pport, kbuffer, need); 166 } 167 168 if (bytes_read != 0) 169 break; 170 171 if (file->f_flags & O_NONBLOCK) { 172 bytes_read = -EAGAIN; 173 break; 174 } 175 176 if (signal_pending(current)) { 177 bytes_read = -ERESTARTSYS; 178 break; 179 } 180 181 cond_resched(); 182 } 183 184 parport_set_timeout(pp->pdev, pp->default_inactivity); 185 186 if (bytes_read > 0 && copy_to_user(buf, kbuffer, bytes_read)) 187 bytes_read = -EFAULT; 188 189 kfree(kbuffer); 190 pp_enable_irq(pp); 191 return bytes_read; 192 } 193 194 static ssize_t pp_write(struct file *file, const char __user *buf, 195 size_t count, loff_t *ppos) 196 { 197 unsigned int minor = iminor(file_inode(file)); 198 struct pp_struct *pp = file->private_data; 199 char *kbuffer; 200 ssize_t bytes_written = 0; 201 ssize_t wrote; 202 int mode; 203 struct parport *pport; 204 205 if (!(pp->flags & PP_CLAIMED)) { 206 /* Don't have the port claimed */ 207 pr_debug(CHRDEV "%x: claim the port first\n", minor); 208 return -EINVAL; 209 } 210 211 kbuffer = kmalloc(min_t(size_t, count, PP_BUFFER_SIZE), GFP_KERNEL); 212 if (!kbuffer) 213 return -ENOMEM; 214 215 pport = pp->pdev->port; 216 mode = pport->ieee1284.mode & ~(IEEE1284_DEVICEID | IEEE1284_ADDR); 217 218 parport_set_timeout(pp->pdev, 219 (file->f_flags & O_NONBLOCK) ? 220 PARPORT_INACTIVITY_O_NONBLOCK : 221 pp->default_inactivity); 222 223 while (bytes_written < count) { 224 ssize_t n = min_t(unsigned long, count - bytes_written, PP_BUFFER_SIZE); 225 226 if (copy_from_user(kbuffer, buf + bytes_written, n)) { 227 bytes_written = -EFAULT; 228 break; 229 } 230 231 if ((pp->flags & PP_FASTWRITE) && (mode == IEEE1284_MODE_EPP)) { 232 /* do a fast EPP write */ 233 if (pport->ieee1284.mode & IEEE1284_ADDR) { 234 wrote = pport->ops->epp_write_addr(pport, 235 kbuffer, n, PARPORT_EPP_FAST); 236 } else { 237 wrote = pport->ops->epp_write_data(pport, 238 kbuffer, n, PARPORT_EPP_FAST); 239 } 240 } else { 241 wrote = parport_write(pp->pdev->port, kbuffer, n); 242 } 243 244 if (wrote <= 0) { 245 if (!bytes_written) 246 bytes_written = wrote; 247 break; 248 } 249 250 bytes_written += wrote; 251 252 if (file->f_flags & O_NONBLOCK) { 253 if (!bytes_written) 254 bytes_written = -EAGAIN; 255 break; 256 } 257 258 if (signal_pending(current)) 259 break; 260 261 cond_resched(); 262 } 263 264 parport_set_timeout(pp->pdev, pp->default_inactivity); 265 266 kfree(kbuffer); 267 pp_enable_irq(pp); 268 return bytes_written; 269 } 270 271 static void pp_irq(void *private) 272 { 273 struct pp_struct *pp = private; 274 275 if (pp->irqresponse) { 276 parport_write_control(pp->pdev->port, pp->irqctl); 277 pp->irqresponse = 0; 278 } 279 280 atomic_inc(&pp->irqc); 281 wake_up_interruptible(&pp->irq_wait); 282 } 283 284 static int register_device(int minor, struct pp_struct *pp) 285 { 286 struct parport *port; 287 struct pardevice *pdev = NULL; 288 char *name; 289 struct pardev_cb ppdev_cb; 290 291 name = kasprintf(GFP_KERNEL, CHRDEV "%x", minor); 292 if (name == NULL) 293 return -ENOMEM; 294 295 port = parport_find_number(minor); 296 if (!port) { 297 printk(KERN_WARNING "%s: no associated port!\n", name); 298 kfree(name); 299 return -ENXIO; 300 } 301 302 memset(&ppdev_cb, 0, sizeof(ppdev_cb)); 303 ppdev_cb.irq_func = pp_irq; 304 ppdev_cb.flags = (pp->flags & PP_EXCL) ? PARPORT_FLAG_EXCL : 0; 305 ppdev_cb.private = pp; 306 pdev = parport_register_dev_model(port, name, &ppdev_cb, minor); 307 parport_put_port(port); 308 309 if (!pdev) { 310 printk(KERN_WARNING "%s: failed to register device!\n", name); 311 kfree(name); 312 return -ENXIO; 313 } 314 315 pp->pdev = pdev; 316 dev_dbg(&pdev->dev, "registered pardevice\n"); 317 return 0; 318 } 319 320 static enum ieee1284_phase init_phase(int mode) 321 { 322 switch (mode & ~(IEEE1284_DEVICEID 323 | IEEE1284_ADDR)) { 324 case IEEE1284_MODE_NIBBLE: 325 case IEEE1284_MODE_BYTE: 326 return IEEE1284_PH_REV_IDLE; 327 } 328 return IEEE1284_PH_FWD_IDLE; 329 } 330 331 static int pp_set_timeout(struct pardevice *pdev, long tv_sec, int tv_usec) 332 { 333 long to_jiffies; 334 335 if ((tv_sec < 0) || (tv_usec < 0)) 336 return -EINVAL; 337 338 to_jiffies = usecs_to_jiffies(tv_usec); 339 to_jiffies += tv_sec * HZ; 340 if (to_jiffies <= 0) 341 return -EINVAL; 342 343 pdev->timeout = to_jiffies; 344 return 0; 345 } 346 347 static int pp_do_ioctl(struct file *file, unsigned int cmd, unsigned long arg) 348 { 349 unsigned int minor = iminor(file_inode(file)); 350 struct pp_struct *pp = file->private_data; 351 struct parport *port; 352 void __user *argp = (void __user *)arg; 353 354 /* First handle the cases that don't take arguments. */ 355 switch (cmd) { 356 case PPCLAIM: 357 { 358 struct ieee1284_info *info; 359 int ret; 360 361 if (pp->flags & PP_CLAIMED) { 362 dev_dbg(&pp->pdev->dev, "you've already got it!\n"); 363 return -EINVAL; 364 } 365 366 /* Deferred device registration. */ 367 if (!pp->pdev) { 368 int err = register_device(minor, pp); 369 370 if (err) 371 return err; 372 } 373 374 ret = parport_claim_or_block(pp->pdev); 375 if (ret < 0) 376 return ret; 377 378 pp->flags |= PP_CLAIMED; 379 380 /* For interrupt-reporting to work, we need to be 381 * informed of each interrupt. */ 382 pp_enable_irq(pp); 383 384 /* We may need to fix up the state machine. */ 385 info = &pp->pdev->port->ieee1284; 386 pp->saved_state.mode = info->mode; 387 pp->saved_state.phase = info->phase; 388 info->mode = pp->state.mode; 389 info->phase = pp->state.phase; 390 pp->default_inactivity = parport_set_timeout(pp->pdev, 0); 391 parport_set_timeout(pp->pdev, pp->default_inactivity); 392 393 return 0; 394 } 395 case PPEXCL: 396 if (pp->pdev) { 397 dev_dbg(&pp->pdev->dev, 398 "too late for PPEXCL; already registered\n"); 399 if (pp->flags & PP_EXCL) 400 /* But it's not really an error. */ 401 return 0; 402 /* There's no chance of making the driver happy. */ 403 return -EINVAL; 404 } 405 406 /* Just remember to register the device exclusively 407 * when we finally do the registration. */ 408 pp->flags |= PP_EXCL; 409 return 0; 410 case PPSETMODE: 411 { 412 int mode; 413 414 if (copy_from_user(&mode, argp, sizeof(mode))) 415 return -EFAULT; 416 /* FIXME: validate mode */ 417 pp->state.mode = mode; 418 pp->state.phase = init_phase(mode); 419 420 if (pp->flags & PP_CLAIMED) { 421 pp->pdev->port->ieee1284.mode = mode; 422 pp->pdev->port->ieee1284.phase = pp->state.phase; 423 } 424 425 return 0; 426 } 427 case PPGETMODE: 428 { 429 int mode; 430 431 if (pp->flags & PP_CLAIMED) 432 mode = pp->pdev->port->ieee1284.mode; 433 else 434 mode = pp->state.mode; 435 436 if (copy_to_user(argp, &mode, sizeof(mode))) 437 return -EFAULT; 438 return 0; 439 } 440 case PPSETPHASE: 441 { 442 int phase; 443 444 if (copy_from_user(&phase, argp, sizeof(phase))) 445 return -EFAULT; 446 447 /* FIXME: validate phase */ 448 pp->state.phase = phase; 449 450 if (pp->flags & PP_CLAIMED) 451 pp->pdev->port->ieee1284.phase = phase; 452 453 return 0; 454 } 455 case PPGETPHASE: 456 { 457 int phase; 458 459 if (pp->flags & PP_CLAIMED) 460 phase = pp->pdev->port->ieee1284.phase; 461 else 462 phase = pp->state.phase; 463 if (copy_to_user(argp, &phase, sizeof(phase))) 464 return -EFAULT; 465 return 0; 466 } 467 case PPGETMODES: 468 { 469 unsigned int modes; 470 471 port = parport_find_number(minor); 472 if (!port) 473 return -ENODEV; 474 475 modes = port->modes; 476 parport_put_port(port); 477 if (copy_to_user(argp, &modes, sizeof(modes))) 478 return -EFAULT; 479 return 0; 480 } 481 case PPSETFLAGS: 482 { 483 int uflags; 484 485 if (copy_from_user(&uflags, argp, sizeof(uflags))) 486 return -EFAULT; 487 pp->flags &= ~PP_FLAGMASK; 488 pp->flags |= (uflags & PP_FLAGMASK); 489 return 0; 490 } 491 case PPGETFLAGS: 492 { 493 int uflags; 494 495 uflags = pp->flags & PP_FLAGMASK; 496 if (copy_to_user(argp, &uflags, sizeof(uflags))) 497 return -EFAULT; 498 return 0; 499 } 500 } /* end switch() */ 501 502 /* Everything else requires the port to be claimed, so check 503 * that now. */ 504 if ((pp->flags & PP_CLAIMED) == 0) { 505 pr_debug(CHRDEV "%x: claim the port first\n", minor); 506 return -EINVAL; 507 } 508 509 port = pp->pdev->port; 510 switch (cmd) { 511 struct ieee1284_info *info; 512 unsigned char reg; 513 unsigned char mask; 514 int mode; 515 s32 time32[2]; 516 s64 time64[2]; 517 struct timespec64 ts; 518 int ret; 519 520 case PPRSTATUS: 521 reg = parport_read_status(port); 522 if (copy_to_user(argp, ®, sizeof(reg))) 523 return -EFAULT; 524 return 0; 525 case PPRDATA: 526 reg = parport_read_data(port); 527 if (copy_to_user(argp, ®, sizeof(reg))) 528 return -EFAULT; 529 return 0; 530 case PPRCONTROL: 531 reg = parport_read_control(port); 532 if (copy_to_user(argp, ®, sizeof(reg))) 533 return -EFAULT; 534 return 0; 535 case PPYIELD: 536 parport_yield_blocking(pp->pdev); 537 return 0; 538 539 case PPRELEASE: 540 /* Save the state machine's state. */ 541 info = &pp->pdev->port->ieee1284; 542 pp->state.mode = info->mode; 543 pp->state.phase = info->phase; 544 info->mode = pp->saved_state.mode; 545 info->phase = pp->saved_state.phase; 546 parport_release(pp->pdev); 547 pp->flags &= ~PP_CLAIMED; 548 return 0; 549 550 case PPWCONTROL: 551 if (copy_from_user(®, argp, sizeof(reg))) 552 return -EFAULT; 553 parport_write_control(port, reg); 554 return 0; 555 556 case PPWDATA: 557 if (copy_from_user(®, argp, sizeof(reg))) 558 return -EFAULT; 559 parport_write_data(port, reg); 560 return 0; 561 562 case PPFCONTROL: 563 if (copy_from_user(&mask, argp, 564 sizeof(mask))) 565 return -EFAULT; 566 if (copy_from_user(®, 1 + (unsigned char __user *) arg, 567 sizeof(reg))) 568 return -EFAULT; 569 parport_frob_control(port, mask, reg); 570 return 0; 571 572 case PPDATADIR: 573 if (copy_from_user(&mode, argp, sizeof(mode))) 574 return -EFAULT; 575 if (mode) 576 port->ops->data_reverse(port); 577 else 578 port->ops->data_forward(port); 579 return 0; 580 581 case PPNEGOT: 582 if (copy_from_user(&mode, argp, sizeof(mode))) 583 return -EFAULT; 584 switch ((ret = parport_negotiate(port, mode))) { 585 case 0: break; 586 case -1: /* handshake failed, peripheral not IEEE 1284 */ 587 ret = -EIO; 588 break; 589 case 1: /* handshake succeeded, peripheral rejected mode */ 590 ret = -ENXIO; 591 break; 592 } 593 pp_enable_irq(pp); 594 return ret; 595 596 case PPWCTLONIRQ: 597 if (copy_from_user(®, argp, sizeof(reg))) 598 return -EFAULT; 599 600 /* Remember what to set the control lines to, for next 601 * time we get an interrupt. */ 602 pp->irqctl = reg; 603 pp->irqresponse = 1; 604 return 0; 605 606 case PPCLRIRQ: 607 ret = atomic_read(&pp->irqc); 608 if (copy_to_user(argp, &ret, sizeof(ret))) 609 return -EFAULT; 610 atomic_sub(ret, &pp->irqc); 611 return 0; 612 613 case PPSETTIME32: 614 if (copy_from_user(time32, argp, sizeof(time32))) 615 return -EFAULT; 616 617 return pp_set_timeout(pp->pdev, time32[0], time32[1]); 618 619 case PPSETTIME64: 620 if (copy_from_user(time64, argp, sizeof(time64))) 621 return -EFAULT; 622 623 return pp_set_timeout(pp->pdev, time64[0], time64[1]); 624 625 case PPGETTIME32: 626 jiffies_to_timespec64(pp->pdev->timeout, &ts); 627 time32[0] = ts.tv_sec; 628 time32[1] = ts.tv_nsec / NSEC_PER_USEC; 629 if ((time32[0] < 0) || (time32[1] < 0)) 630 return -EINVAL; 631 632 if (copy_to_user(argp, time32, sizeof(time32))) 633 return -EFAULT; 634 635 return 0; 636 637 case PPGETTIME64: 638 jiffies_to_timespec64(pp->pdev->timeout, &ts); 639 time64[0] = ts.tv_sec; 640 time64[1] = ts.tv_nsec / NSEC_PER_USEC; 641 if ((time64[0] < 0) || (time64[1] < 0)) 642 return -EINVAL; 643 644 if (copy_to_user(argp, time64, sizeof(time64))) 645 return -EFAULT; 646 647 return 0; 648 649 default: 650 dev_dbg(&pp->pdev->dev, "What? (cmd=0x%x)\n", cmd); 651 return -EINVAL; 652 } 653 654 /* Keep the compiler happy */ 655 return 0; 656 } 657 658 static long pp_ioctl(struct file *file, unsigned int cmd, unsigned long arg) 659 { 660 long ret; 661 662 mutex_lock(&pp_do_mutex); 663 ret = pp_do_ioctl(file, cmd, arg); 664 mutex_unlock(&pp_do_mutex); 665 return ret; 666 } 667 668 #ifdef CONFIG_COMPAT 669 static long pp_compat_ioctl(struct file *file, unsigned int cmd, 670 unsigned long arg) 671 { 672 return pp_ioctl(file, cmd, (unsigned long)compat_ptr(arg)); 673 } 674 #endif 675 676 static int pp_open(struct inode *inode, struct file *file) 677 { 678 unsigned int minor = iminor(inode); 679 struct pp_struct *pp; 680 681 if (minor >= PARPORT_MAX) 682 return -ENXIO; 683 684 pp = kmalloc(sizeof(struct pp_struct), GFP_KERNEL); 685 if (!pp) 686 return -ENOMEM; 687 688 pp->state.mode = IEEE1284_MODE_COMPAT; 689 pp->state.phase = init_phase(pp->state.mode); 690 pp->flags = 0; 691 pp->irqresponse = 0; 692 atomic_set(&pp->irqc, 0); 693 init_waitqueue_head(&pp->irq_wait); 694 695 /* Defer the actual device registration until the first claim. 696 * That way, we know whether or not the driver wants to have 697 * exclusive access to the port (PPEXCL). 698 */ 699 pp->pdev = NULL; 700 file->private_data = pp; 701 702 return 0; 703 } 704 705 static int pp_release(struct inode *inode, struct file *file) 706 { 707 unsigned int minor = iminor(inode); 708 struct pp_struct *pp = file->private_data; 709 int compat_negot; 710 711 compat_negot = 0; 712 if (!(pp->flags & PP_CLAIMED) && pp->pdev && 713 (pp->state.mode != IEEE1284_MODE_COMPAT)) { 714 struct ieee1284_info *info; 715 716 /* parport released, but not in compatibility mode */ 717 parport_claim_or_block(pp->pdev); 718 pp->flags |= PP_CLAIMED; 719 info = &pp->pdev->port->ieee1284; 720 pp->saved_state.mode = info->mode; 721 pp->saved_state.phase = info->phase; 722 info->mode = pp->state.mode; 723 info->phase = pp->state.phase; 724 compat_negot = 1; 725 } else if ((pp->flags & PP_CLAIMED) && pp->pdev && 726 (pp->pdev->port->ieee1284.mode != IEEE1284_MODE_COMPAT)) { 727 compat_negot = 2; 728 } 729 if (compat_negot) { 730 parport_negotiate(pp->pdev->port, IEEE1284_MODE_COMPAT); 731 dev_dbg(&pp->pdev->dev, 732 "negotiated back to compatibility mode because user-space forgot\n"); 733 } 734 735 if (pp->flags & PP_CLAIMED) { 736 struct ieee1284_info *info; 737 738 info = &pp->pdev->port->ieee1284; 739 pp->state.mode = info->mode; 740 pp->state.phase = info->phase; 741 info->mode = pp->saved_state.mode; 742 info->phase = pp->saved_state.phase; 743 parport_release(pp->pdev); 744 if (compat_negot != 1) { 745 pr_debug(CHRDEV "%x: released pardevice " 746 "because user-space forgot\n", minor); 747 } 748 } 749 750 if (pp->pdev) { 751 const char *name = pp->pdev->name; 752 753 parport_unregister_device(pp->pdev); 754 kfree(name); 755 pp->pdev = NULL; 756 pr_debug(CHRDEV "%x: unregistered pardevice\n", minor); 757 } 758 759 kfree(pp); 760 761 return 0; 762 } 763 764 /* No kernel lock held - fine */ 765 static unsigned int pp_poll(struct file *file, poll_table *wait) 766 { 767 struct pp_struct *pp = file->private_data; 768 unsigned int mask = 0; 769 770 poll_wait(file, &pp->irq_wait, wait); 771 if (atomic_read(&pp->irqc)) 772 mask |= POLLIN | POLLRDNORM; 773 774 return mask; 775 } 776 777 static struct class *ppdev_class; 778 779 static const struct file_operations pp_fops = { 780 .owner = THIS_MODULE, 781 .llseek = no_llseek, 782 .read = pp_read, 783 .write = pp_write, 784 .poll = pp_poll, 785 .unlocked_ioctl = pp_ioctl, 786 #ifdef CONFIG_COMPAT 787 .compat_ioctl = pp_compat_ioctl, 788 #endif 789 .open = pp_open, 790 .release = pp_release, 791 }; 792 793 static void pp_attach(struct parport *port) 794 { 795 device_create(ppdev_class, port->dev, MKDEV(PP_MAJOR, port->number), 796 NULL, "parport%d", port->number); 797 } 798 799 static void pp_detach(struct parport *port) 800 { 801 device_destroy(ppdev_class, MKDEV(PP_MAJOR, port->number)); 802 } 803 804 static int pp_probe(struct pardevice *par_dev) 805 { 806 struct device_driver *drv = par_dev->dev.driver; 807 int len = strlen(drv->name); 808 809 if (strncmp(par_dev->name, drv->name, len)) 810 return -ENODEV; 811 812 return 0; 813 } 814 815 static struct parport_driver pp_driver = { 816 .name = CHRDEV, 817 .probe = pp_probe, 818 .match_port = pp_attach, 819 .detach = pp_detach, 820 .devmodel = true, 821 }; 822 823 static int __init ppdev_init(void) 824 { 825 int err = 0; 826 827 if (register_chrdev(PP_MAJOR, CHRDEV, &pp_fops)) { 828 printk(KERN_WARNING CHRDEV ": unable to get major %d\n", 829 PP_MAJOR); 830 return -EIO; 831 } 832 ppdev_class = class_create(THIS_MODULE, CHRDEV); 833 if (IS_ERR(ppdev_class)) { 834 err = PTR_ERR(ppdev_class); 835 goto out_chrdev; 836 } 837 err = parport_register_driver(&pp_driver); 838 if (err < 0) { 839 printk(KERN_WARNING CHRDEV ": unable to register with parport\n"); 840 goto out_class; 841 } 842 843 printk(KERN_INFO PP_VERSION "\n"); 844 goto out; 845 846 out_class: 847 class_destroy(ppdev_class); 848 out_chrdev: 849 unregister_chrdev(PP_MAJOR, CHRDEV); 850 out: 851 return err; 852 } 853 854 static void __exit ppdev_cleanup(void) 855 { 856 /* Clean up all parport stuff */ 857 parport_unregister_driver(&pp_driver); 858 class_destroy(ppdev_class); 859 unregister_chrdev(PP_MAJOR, CHRDEV); 860 } 861 862 module_init(ppdev_init); 863 module_exit(ppdev_cleanup); 864 865 MODULE_LICENSE("GPL"); 866 MODULE_ALIAS_CHARDEV_MAJOR(PP_MAJOR); 867