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 int fl; 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 fl = (pp->flags & PP_EXCL) ? PARPORT_FLAG_EXCL : 0; 303 pdev = parport_register_device(port, name, NULL, 304 NULL, pp_irq, fl, pp); 305 parport_put_port(port); 306 307 if (!pdev) { 308 printk(KERN_WARNING "%s: failed to register device!\n", name); 309 kfree(name); 310 return -ENXIO; 311 } 312 313 pp->pdev = pdev; 314 dev_dbg(&pdev->dev, "registered pardevice\n"); 315 return 0; 316 } 317 318 static enum ieee1284_phase init_phase(int mode) 319 { 320 switch (mode & ~(IEEE1284_DEVICEID 321 | IEEE1284_ADDR)) { 322 case IEEE1284_MODE_NIBBLE: 323 case IEEE1284_MODE_BYTE: 324 return IEEE1284_PH_REV_IDLE; 325 } 326 return IEEE1284_PH_FWD_IDLE; 327 } 328 329 static int pp_set_timeout(struct pardevice *pdev, long tv_sec, int tv_usec) 330 { 331 long to_jiffies; 332 333 if ((tv_sec < 0) || (tv_usec < 0)) 334 return -EINVAL; 335 336 to_jiffies = usecs_to_jiffies(tv_usec); 337 to_jiffies += tv_sec * HZ; 338 if (to_jiffies <= 0) 339 return -EINVAL; 340 341 pdev->timeout = to_jiffies; 342 return 0; 343 } 344 345 static int pp_do_ioctl(struct file *file, unsigned int cmd, unsigned long arg) 346 { 347 unsigned int minor = iminor(file_inode(file)); 348 struct pp_struct *pp = file->private_data; 349 struct parport *port; 350 void __user *argp = (void __user *)arg; 351 352 /* First handle the cases that don't take arguments. */ 353 switch (cmd) { 354 case PPCLAIM: 355 { 356 struct ieee1284_info *info; 357 int ret; 358 359 if (pp->flags & PP_CLAIMED) { 360 dev_dbg(&pp->pdev->dev, "you've already got it!\n"); 361 return -EINVAL; 362 } 363 364 /* Deferred device registration. */ 365 if (!pp->pdev) { 366 int err = register_device(minor, pp); 367 368 if (err) 369 return err; 370 } 371 372 ret = parport_claim_or_block(pp->pdev); 373 if (ret < 0) 374 return ret; 375 376 pp->flags |= PP_CLAIMED; 377 378 /* For interrupt-reporting to work, we need to be 379 * informed of each interrupt. */ 380 pp_enable_irq(pp); 381 382 /* We may need to fix up the state machine. */ 383 info = &pp->pdev->port->ieee1284; 384 pp->saved_state.mode = info->mode; 385 pp->saved_state.phase = info->phase; 386 info->mode = pp->state.mode; 387 info->phase = pp->state.phase; 388 pp->default_inactivity = parport_set_timeout(pp->pdev, 0); 389 parport_set_timeout(pp->pdev, pp->default_inactivity); 390 391 return 0; 392 } 393 case PPEXCL: 394 if (pp->pdev) { 395 dev_dbg(&pp->pdev->dev, 396 "too late for PPEXCL; already registered\n"); 397 if (pp->flags & PP_EXCL) 398 /* But it's not really an error. */ 399 return 0; 400 /* There's no chance of making the driver happy. */ 401 return -EINVAL; 402 } 403 404 /* Just remember to register the device exclusively 405 * when we finally do the registration. */ 406 pp->flags |= PP_EXCL; 407 return 0; 408 case PPSETMODE: 409 { 410 int mode; 411 412 if (copy_from_user(&mode, argp, sizeof(mode))) 413 return -EFAULT; 414 /* FIXME: validate mode */ 415 pp->state.mode = mode; 416 pp->state.phase = init_phase(mode); 417 418 if (pp->flags & PP_CLAIMED) { 419 pp->pdev->port->ieee1284.mode = mode; 420 pp->pdev->port->ieee1284.phase = pp->state.phase; 421 } 422 423 return 0; 424 } 425 case PPGETMODE: 426 { 427 int mode; 428 429 if (pp->flags & PP_CLAIMED) 430 mode = pp->pdev->port->ieee1284.mode; 431 else 432 mode = pp->state.mode; 433 434 if (copy_to_user(argp, &mode, sizeof(mode))) 435 return -EFAULT; 436 return 0; 437 } 438 case PPSETPHASE: 439 { 440 int phase; 441 442 if (copy_from_user(&phase, argp, sizeof(phase))) 443 return -EFAULT; 444 445 /* FIXME: validate phase */ 446 pp->state.phase = phase; 447 448 if (pp->flags & PP_CLAIMED) 449 pp->pdev->port->ieee1284.phase = phase; 450 451 return 0; 452 } 453 case PPGETPHASE: 454 { 455 int phase; 456 457 if (pp->flags & PP_CLAIMED) 458 phase = pp->pdev->port->ieee1284.phase; 459 else 460 phase = pp->state.phase; 461 if (copy_to_user(argp, &phase, sizeof(phase))) 462 return -EFAULT; 463 return 0; 464 } 465 case PPGETMODES: 466 { 467 unsigned int modes; 468 469 port = parport_find_number(minor); 470 if (!port) 471 return -ENODEV; 472 473 modes = port->modes; 474 parport_put_port(port); 475 if (copy_to_user(argp, &modes, sizeof(modes))) 476 return -EFAULT; 477 return 0; 478 } 479 case PPSETFLAGS: 480 { 481 int uflags; 482 483 if (copy_from_user(&uflags, argp, sizeof(uflags))) 484 return -EFAULT; 485 pp->flags &= ~PP_FLAGMASK; 486 pp->flags |= (uflags & PP_FLAGMASK); 487 return 0; 488 } 489 case PPGETFLAGS: 490 { 491 int uflags; 492 493 uflags = pp->flags & PP_FLAGMASK; 494 if (copy_to_user(argp, &uflags, sizeof(uflags))) 495 return -EFAULT; 496 return 0; 497 } 498 } /* end switch() */ 499 500 /* Everything else requires the port to be claimed, so check 501 * that now. */ 502 if ((pp->flags & PP_CLAIMED) == 0) { 503 pr_debug(CHRDEV "%x: claim the port first\n", minor); 504 return -EINVAL; 505 } 506 507 port = pp->pdev->port; 508 switch (cmd) { 509 struct ieee1284_info *info; 510 unsigned char reg; 511 unsigned char mask; 512 int mode; 513 s32 time32[2]; 514 s64 time64[2]; 515 struct timespec64 ts; 516 int ret; 517 518 case PPRSTATUS: 519 reg = parport_read_status(port); 520 if (copy_to_user(argp, ®, sizeof(reg))) 521 return -EFAULT; 522 return 0; 523 case PPRDATA: 524 reg = parport_read_data(port); 525 if (copy_to_user(argp, ®, sizeof(reg))) 526 return -EFAULT; 527 return 0; 528 case PPRCONTROL: 529 reg = parport_read_control(port); 530 if (copy_to_user(argp, ®, sizeof(reg))) 531 return -EFAULT; 532 return 0; 533 case PPYIELD: 534 parport_yield_blocking(pp->pdev); 535 return 0; 536 537 case PPRELEASE: 538 /* Save the state machine's state. */ 539 info = &pp->pdev->port->ieee1284; 540 pp->state.mode = info->mode; 541 pp->state.phase = info->phase; 542 info->mode = pp->saved_state.mode; 543 info->phase = pp->saved_state.phase; 544 parport_release(pp->pdev); 545 pp->flags &= ~PP_CLAIMED; 546 return 0; 547 548 case PPWCONTROL: 549 if (copy_from_user(®, argp, sizeof(reg))) 550 return -EFAULT; 551 parport_write_control(port, reg); 552 return 0; 553 554 case PPWDATA: 555 if (copy_from_user(®, argp, sizeof(reg))) 556 return -EFAULT; 557 parport_write_data(port, reg); 558 return 0; 559 560 case PPFCONTROL: 561 if (copy_from_user(&mask, argp, 562 sizeof(mask))) 563 return -EFAULT; 564 if (copy_from_user(®, 1 + (unsigned char __user *) arg, 565 sizeof(reg))) 566 return -EFAULT; 567 parport_frob_control(port, mask, reg); 568 return 0; 569 570 case PPDATADIR: 571 if (copy_from_user(&mode, argp, sizeof(mode))) 572 return -EFAULT; 573 if (mode) 574 port->ops->data_reverse(port); 575 else 576 port->ops->data_forward(port); 577 return 0; 578 579 case PPNEGOT: 580 if (copy_from_user(&mode, argp, sizeof(mode))) 581 return -EFAULT; 582 switch ((ret = parport_negotiate(port, mode))) { 583 case 0: break; 584 case -1: /* handshake failed, peripheral not IEEE 1284 */ 585 ret = -EIO; 586 break; 587 case 1: /* handshake succeeded, peripheral rejected mode */ 588 ret = -ENXIO; 589 break; 590 } 591 pp_enable_irq(pp); 592 return ret; 593 594 case PPWCTLONIRQ: 595 if (copy_from_user(®, argp, sizeof(reg))) 596 return -EFAULT; 597 598 /* Remember what to set the control lines to, for next 599 * time we get an interrupt. */ 600 pp->irqctl = reg; 601 pp->irqresponse = 1; 602 return 0; 603 604 case PPCLRIRQ: 605 ret = atomic_read(&pp->irqc); 606 if (copy_to_user(argp, &ret, sizeof(ret))) 607 return -EFAULT; 608 atomic_sub(ret, &pp->irqc); 609 return 0; 610 611 case PPSETTIME32: 612 if (copy_from_user(time32, argp, sizeof(time32))) 613 return -EFAULT; 614 615 return pp_set_timeout(pp->pdev, time32[0], time32[1]); 616 617 case PPSETTIME64: 618 if (copy_from_user(time64, argp, sizeof(time64))) 619 return -EFAULT; 620 621 return pp_set_timeout(pp->pdev, time64[0], time64[1]); 622 623 case PPGETTIME32: 624 jiffies_to_timespec64(pp->pdev->timeout, &ts); 625 time32[0] = ts.tv_sec; 626 time32[1] = ts.tv_nsec / NSEC_PER_USEC; 627 if ((time32[0] < 0) || (time32[1] < 0)) 628 return -EINVAL; 629 630 if (copy_to_user(argp, time32, sizeof(time32))) 631 return -EFAULT; 632 633 return 0; 634 635 case PPGETTIME64: 636 jiffies_to_timespec64(pp->pdev->timeout, &ts); 637 time64[0] = ts.tv_sec; 638 time64[1] = ts.tv_nsec / NSEC_PER_USEC; 639 if ((time64[0] < 0) || (time64[1] < 0)) 640 return -EINVAL; 641 642 if (copy_to_user(argp, time64, sizeof(time64))) 643 return -EFAULT; 644 645 return 0; 646 647 default: 648 dev_dbg(&pp->pdev->dev, "What? (cmd=0x%x)\n", cmd); 649 return -EINVAL; 650 } 651 652 /* Keep the compiler happy */ 653 return 0; 654 } 655 656 static long pp_ioctl(struct file *file, unsigned int cmd, unsigned long arg) 657 { 658 long ret; 659 660 mutex_lock(&pp_do_mutex); 661 ret = pp_do_ioctl(file, cmd, arg); 662 mutex_unlock(&pp_do_mutex); 663 return ret; 664 } 665 666 #ifdef CONFIG_COMPAT 667 static long pp_compat_ioctl(struct file *file, unsigned int cmd, 668 unsigned long arg) 669 { 670 return pp_ioctl(file, cmd, (unsigned long)compat_ptr(arg)); 671 } 672 #endif 673 674 static int pp_open(struct inode *inode, struct file *file) 675 { 676 unsigned int minor = iminor(inode); 677 struct pp_struct *pp; 678 679 if (minor >= PARPORT_MAX) 680 return -ENXIO; 681 682 pp = kmalloc(sizeof(struct pp_struct), GFP_KERNEL); 683 if (!pp) 684 return -ENOMEM; 685 686 pp->state.mode = IEEE1284_MODE_COMPAT; 687 pp->state.phase = init_phase(pp->state.mode); 688 pp->flags = 0; 689 pp->irqresponse = 0; 690 atomic_set(&pp->irqc, 0); 691 init_waitqueue_head(&pp->irq_wait); 692 693 /* Defer the actual device registration until the first claim. 694 * That way, we know whether or not the driver wants to have 695 * exclusive access to the port (PPEXCL). 696 */ 697 pp->pdev = NULL; 698 file->private_data = pp; 699 700 return 0; 701 } 702 703 static int pp_release(struct inode *inode, struct file *file) 704 { 705 unsigned int minor = iminor(inode); 706 struct pp_struct *pp = file->private_data; 707 int compat_negot; 708 709 compat_negot = 0; 710 if (!(pp->flags & PP_CLAIMED) && pp->pdev && 711 (pp->state.mode != IEEE1284_MODE_COMPAT)) { 712 struct ieee1284_info *info; 713 714 /* parport released, but not in compatibility mode */ 715 parport_claim_or_block(pp->pdev); 716 pp->flags |= PP_CLAIMED; 717 info = &pp->pdev->port->ieee1284; 718 pp->saved_state.mode = info->mode; 719 pp->saved_state.phase = info->phase; 720 info->mode = pp->state.mode; 721 info->phase = pp->state.phase; 722 compat_negot = 1; 723 } else if ((pp->flags & PP_CLAIMED) && pp->pdev && 724 (pp->pdev->port->ieee1284.mode != IEEE1284_MODE_COMPAT)) { 725 compat_negot = 2; 726 } 727 if (compat_negot) { 728 parport_negotiate(pp->pdev->port, IEEE1284_MODE_COMPAT); 729 dev_dbg(&pp->pdev->dev, 730 "negotiated back to compatibility mode because user-space forgot\n"); 731 } 732 733 if (pp->flags & PP_CLAIMED) { 734 struct ieee1284_info *info; 735 736 info = &pp->pdev->port->ieee1284; 737 pp->state.mode = info->mode; 738 pp->state.phase = info->phase; 739 info->mode = pp->saved_state.mode; 740 info->phase = pp->saved_state.phase; 741 parport_release(pp->pdev); 742 if (compat_negot != 1) { 743 pr_debug(CHRDEV "%x: released pardevice " 744 "because user-space forgot\n", minor); 745 } 746 } 747 748 if (pp->pdev) { 749 const char *name = pp->pdev->name; 750 751 parport_unregister_device(pp->pdev); 752 kfree(name); 753 pp->pdev = NULL; 754 pr_debug(CHRDEV "%x: unregistered pardevice\n", minor); 755 } 756 757 kfree(pp); 758 759 return 0; 760 } 761 762 /* No kernel lock held - fine */ 763 static unsigned int pp_poll(struct file *file, poll_table *wait) 764 { 765 struct pp_struct *pp = file->private_data; 766 unsigned int mask = 0; 767 768 poll_wait(file, &pp->irq_wait, wait); 769 if (atomic_read(&pp->irqc)) 770 mask |= POLLIN | POLLRDNORM; 771 772 return mask; 773 } 774 775 static struct class *ppdev_class; 776 777 static const struct file_operations pp_fops = { 778 .owner = THIS_MODULE, 779 .llseek = no_llseek, 780 .read = pp_read, 781 .write = pp_write, 782 .poll = pp_poll, 783 .unlocked_ioctl = pp_ioctl, 784 #ifdef CONFIG_COMPAT 785 .compat_ioctl = pp_compat_ioctl, 786 #endif 787 .open = pp_open, 788 .release = pp_release, 789 }; 790 791 static void pp_attach(struct parport *port) 792 { 793 device_create(ppdev_class, port->dev, MKDEV(PP_MAJOR, port->number), 794 NULL, "parport%d", port->number); 795 } 796 797 static void pp_detach(struct parport *port) 798 { 799 device_destroy(ppdev_class, MKDEV(PP_MAJOR, port->number)); 800 } 801 802 static struct parport_driver pp_driver = { 803 .name = CHRDEV, 804 .attach = pp_attach, 805 .detach = pp_detach, 806 }; 807 808 static int __init ppdev_init(void) 809 { 810 int err = 0; 811 812 if (register_chrdev(PP_MAJOR, CHRDEV, &pp_fops)) { 813 printk(KERN_WARNING CHRDEV ": unable to get major %d\n", 814 PP_MAJOR); 815 return -EIO; 816 } 817 ppdev_class = class_create(THIS_MODULE, CHRDEV); 818 if (IS_ERR(ppdev_class)) { 819 err = PTR_ERR(ppdev_class); 820 goto out_chrdev; 821 } 822 err = parport_register_driver(&pp_driver); 823 if (err < 0) { 824 printk(KERN_WARNING CHRDEV ": unable to register with parport\n"); 825 goto out_class; 826 } 827 828 printk(KERN_INFO PP_VERSION "\n"); 829 goto out; 830 831 out_class: 832 class_destroy(ppdev_class); 833 out_chrdev: 834 unregister_chrdev(PP_MAJOR, CHRDEV); 835 out: 836 return err; 837 } 838 839 static void __exit ppdev_cleanup(void) 840 { 841 /* Clean up all parport stuff */ 842 parport_unregister_driver(&pp_driver); 843 class_destroy(ppdev_class); 844 unregister_chrdev(PP_MAJOR, CHRDEV); 845 } 846 847 module_init(ppdev_init); 848 module_exit(ppdev_cleanup); 849 850 MODULE_LICENSE("GPL"); 851 MODULE_ALIAS_CHARDEV_MAJOR(PP_MAJOR); 852