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 /* should we use PARDEVICE_MAX here? */ 90 static struct device *devices[PARPORT_MAX]; 91 92 /* pp_struct.flags bitfields */ 93 #define PP_CLAIMED (1<<0) 94 #define PP_EXCL (1<<1) 95 96 /* Other constants */ 97 #define PP_INTERRUPT_TIMEOUT (10 * HZ) /* 10s */ 98 #define PP_BUFFER_SIZE 1024 99 #define PARDEVICE_MAX 8 100 101 /* ROUND_UP macro from fs/select.c */ 102 #define ROUND_UP(x,y) (((x)+(y)-1)/(y)) 103 104 static DEFINE_MUTEX(pp_do_mutex); 105 106 /* define fixed sized ioctl cmd for y2038 migration */ 107 #define PPGETTIME32 _IOR(PP_IOCTL, 0x95, s32[2]) 108 #define PPSETTIME32 _IOW(PP_IOCTL, 0x96, s32[2]) 109 #define PPGETTIME64 _IOR(PP_IOCTL, 0x95, s64[2]) 110 #define PPSETTIME64 _IOW(PP_IOCTL, 0x96, s64[2]) 111 112 static inline void pp_enable_irq(struct pp_struct *pp) 113 { 114 struct parport *port = pp->pdev->port; 115 116 port->ops->enable_irq(port); 117 } 118 119 static ssize_t pp_read(struct file *file, char __user *buf, size_t count, 120 loff_t *ppos) 121 { 122 unsigned int minor = iminor(file_inode(file)); 123 struct pp_struct *pp = file->private_data; 124 char *kbuffer; 125 ssize_t bytes_read = 0; 126 struct parport *pport; 127 int mode; 128 129 if (!(pp->flags & PP_CLAIMED)) { 130 /* Don't have the port claimed */ 131 pr_debug(CHRDEV "%x: claim the port first\n", minor); 132 return -EINVAL; 133 } 134 135 /* Trivial case. */ 136 if (count == 0) 137 return 0; 138 139 kbuffer = kmalloc(min_t(size_t, count, PP_BUFFER_SIZE), GFP_KERNEL); 140 if (!kbuffer) 141 return -ENOMEM; 142 pport = pp->pdev->port; 143 mode = pport->ieee1284.mode & ~(IEEE1284_DEVICEID | IEEE1284_ADDR); 144 145 parport_set_timeout(pp->pdev, 146 (file->f_flags & O_NONBLOCK) ? 147 PARPORT_INACTIVITY_O_NONBLOCK : 148 pp->default_inactivity); 149 150 while (bytes_read == 0) { 151 ssize_t need = min_t(unsigned long, count, PP_BUFFER_SIZE); 152 153 if (mode == IEEE1284_MODE_EPP) { 154 /* various specials for EPP mode */ 155 int flags = 0; 156 size_t (*fn)(struct parport *, void *, size_t, int); 157 158 if (pp->flags & PP_W91284PIC) 159 flags |= PARPORT_W91284PIC; 160 if (pp->flags & PP_FASTREAD) 161 flags |= PARPORT_EPP_FAST; 162 if (pport->ieee1284.mode & IEEE1284_ADDR) 163 fn = pport->ops->epp_read_addr; 164 else 165 fn = pport->ops->epp_read_data; 166 bytes_read = (*fn)(pport, kbuffer, need, flags); 167 } else { 168 bytes_read = parport_read(pport, kbuffer, need); 169 } 170 171 if (bytes_read != 0) 172 break; 173 174 if (file->f_flags & O_NONBLOCK) { 175 bytes_read = -EAGAIN; 176 break; 177 } 178 179 if (signal_pending(current)) { 180 bytes_read = -ERESTARTSYS; 181 break; 182 } 183 184 cond_resched(); 185 } 186 187 parport_set_timeout(pp->pdev, pp->default_inactivity); 188 189 if (bytes_read > 0 && copy_to_user(buf, kbuffer, bytes_read)) 190 bytes_read = -EFAULT; 191 192 kfree(kbuffer); 193 pp_enable_irq(pp); 194 return bytes_read; 195 } 196 197 static ssize_t pp_write(struct file *file, const char __user *buf, 198 size_t count, loff_t *ppos) 199 { 200 unsigned int minor = iminor(file_inode(file)); 201 struct pp_struct *pp = file->private_data; 202 char *kbuffer; 203 ssize_t bytes_written = 0; 204 ssize_t wrote; 205 int mode; 206 struct parport *pport; 207 208 if (!(pp->flags & PP_CLAIMED)) { 209 /* Don't have the port claimed */ 210 pr_debug(CHRDEV "%x: claim the port first\n", minor); 211 return -EINVAL; 212 } 213 214 kbuffer = kmalloc(min_t(size_t, count, PP_BUFFER_SIZE), GFP_KERNEL); 215 if (!kbuffer) 216 return -ENOMEM; 217 218 pport = pp->pdev->port; 219 mode = pport->ieee1284.mode & ~(IEEE1284_DEVICEID | IEEE1284_ADDR); 220 221 parport_set_timeout(pp->pdev, 222 (file->f_flags & O_NONBLOCK) ? 223 PARPORT_INACTIVITY_O_NONBLOCK : 224 pp->default_inactivity); 225 226 while (bytes_written < count) { 227 ssize_t n = min_t(unsigned long, count - bytes_written, PP_BUFFER_SIZE); 228 229 if (copy_from_user(kbuffer, buf + bytes_written, n)) { 230 bytes_written = -EFAULT; 231 break; 232 } 233 234 if ((pp->flags & PP_FASTWRITE) && (mode == IEEE1284_MODE_EPP)) { 235 /* do a fast EPP write */ 236 if (pport->ieee1284.mode & IEEE1284_ADDR) { 237 wrote = pport->ops->epp_write_addr(pport, 238 kbuffer, n, PARPORT_EPP_FAST); 239 } else { 240 wrote = pport->ops->epp_write_data(pport, 241 kbuffer, n, PARPORT_EPP_FAST); 242 } 243 } else { 244 wrote = parport_write(pp->pdev->port, kbuffer, n); 245 } 246 247 if (wrote <= 0) { 248 if (!bytes_written) 249 bytes_written = wrote; 250 break; 251 } 252 253 bytes_written += wrote; 254 255 if (file->f_flags & O_NONBLOCK) { 256 if (!bytes_written) 257 bytes_written = -EAGAIN; 258 break; 259 } 260 261 if (signal_pending(current)) 262 break; 263 264 cond_resched(); 265 } 266 267 parport_set_timeout(pp->pdev, pp->default_inactivity); 268 269 kfree(kbuffer); 270 pp_enable_irq(pp); 271 return bytes_written; 272 } 273 274 static void pp_irq(void *private) 275 { 276 struct pp_struct *pp = private; 277 278 if (pp->irqresponse) { 279 parport_write_control(pp->pdev->port, pp->irqctl); 280 pp->irqresponse = 0; 281 } 282 283 atomic_inc(&pp->irqc); 284 wake_up_interruptible(&pp->irq_wait); 285 } 286 287 static int register_device(int minor, struct pp_struct *pp) 288 { 289 struct parport *port; 290 struct pardevice *pdev = NULL; 291 char *name; 292 struct pardev_cb ppdev_cb; 293 294 name = kasprintf(GFP_KERNEL, CHRDEV "%x", minor); 295 if (name == NULL) 296 return -ENOMEM; 297 298 port = parport_find_number(minor); 299 if (!port) { 300 pr_warn("%s: no associated port!\n", name); 301 kfree(name); 302 return -ENXIO; 303 } 304 305 memset(&ppdev_cb, 0, sizeof(ppdev_cb)); 306 ppdev_cb.irq_func = pp_irq; 307 ppdev_cb.flags = (pp->flags & PP_EXCL) ? PARPORT_FLAG_EXCL : 0; 308 ppdev_cb.private = pp; 309 pdev = parport_register_dev_model(port, name, &ppdev_cb, minor); 310 parport_put_port(port); 311 kfree(name); 312 313 if (!pdev) { 314 pr_warn("%s: failed to register device!\n", name); 315 return -ENXIO; 316 } 317 318 pp->pdev = pdev; 319 dev_dbg(&pdev->dev, "registered pardevice\n"); 320 return 0; 321 } 322 323 static enum ieee1284_phase init_phase(int mode) 324 { 325 switch (mode & ~(IEEE1284_DEVICEID 326 | IEEE1284_ADDR)) { 327 case IEEE1284_MODE_NIBBLE: 328 case IEEE1284_MODE_BYTE: 329 return IEEE1284_PH_REV_IDLE; 330 } 331 return IEEE1284_PH_FWD_IDLE; 332 } 333 334 static int pp_set_timeout(struct pardevice *pdev, long tv_sec, int tv_usec) 335 { 336 long to_jiffies; 337 338 if ((tv_sec < 0) || (tv_usec < 0)) 339 return -EINVAL; 340 341 to_jiffies = usecs_to_jiffies(tv_usec); 342 to_jiffies += tv_sec * HZ; 343 if (to_jiffies <= 0) 344 return -EINVAL; 345 346 pdev->timeout = to_jiffies; 347 return 0; 348 } 349 350 static int pp_do_ioctl(struct file *file, unsigned int cmd, unsigned long arg) 351 { 352 unsigned int minor = iminor(file_inode(file)); 353 struct pp_struct *pp = file->private_data; 354 struct parport *port; 355 void __user *argp = (void __user *)arg; 356 357 /* First handle the cases that don't take arguments. */ 358 switch (cmd) { 359 case PPCLAIM: 360 { 361 struct ieee1284_info *info; 362 int ret; 363 364 if (pp->flags & PP_CLAIMED) { 365 dev_dbg(&pp->pdev->dev, "you've already got it!\n"); 366 return -EINVAL; 367 } 368 369 /* Deferred device registration. */ 370 if (!pp->pdev) { 371 int err = register_device(minor, pp); 372 373 if (err) 374 return err; 375 } 376 377 ret = parport_claim_or_block(pp->pdev); 378 if (ret < 0) 379 return ret; 380 381 pp->flags |= PP_CLAIMED; 382 383 /* For interrupt-reporting to work, we need to be 384 * informed of each interrupt. */ 385 pp_enable_irq(pp); 386 387 /* We may need to fix up the state machine. */ 388 info = &pp->pdev->port->ieee1284; 389 pp->saved_state.mode = info->mode; 390 pp->saved_state.phase = info->phase; 391 info->mode = pp->state.mode; 392 info->phase = pp->state.phase; 393 pp->default_inactivity = parport_set_timeout(pp->pdev, 0); 394 parport_set_timeout(pp->pdev, pp->default_inactivity); 395 396 return 0; 397 } 398 case PPEXCL: 399 if (pp->pdev) { 400 dev_dbg(&pp->pdev->dev, 401 "too late for PPEXCL; already registered\n"); 402 if (pp->flags & PP_EXCL) 403 /* But it's not really an error. */ 404 return 0; 405 /* There's no chance of making the driver happy. */ 406 return -EINVAL; 407 } 408 409 /* Just remember to register the device exclusively 410 * when we finally do the registration. */ 411 pp->flags |= PP_EXCL; 412 return 0; 413 case PPSETMODE: 414 { 415 int mode; 416 417 if (copy_from_user(&mode, argp, sizeof(mode))) 418 return -EFAULT; 419 /* FIXME: validate mode */ 420 pp->state.mode = mode; 421 pp->state.phase = init_phase(mode); 422 423 if (pp->flags & PP_CLAIMED) { 424 pp->pdev->port->ieee1284.mode = mode; 425 pp->pdev->port->ieee1284.phase = pp->state.phase; 426 } 427 428 return 0; 429 } 430 case PPGETMODE: 431 { 432 int mode; 433 434 if (pp->flags & PP_CLAIMED) 435 mode = pp->pdev->port->ieee1284.mode; 436 else 437 mode = pp->state.mode; 438 439 if (copy_to_user(argp, &mode, sizeof(mode))) 440 return -EFAULT; 441 return 0; 442 } 443 case PPSETPHASE: 444 { 445 int phase; 446 447 if (copy_from_user(&phase, argp, sizeof(phase))) 448 return -EFAULT; 449 450 /* FIXME: validate phase */ 451 pp->state.phase = phase; 452 453 if (pp->flags & PP_CLAIMED) 454 pp->pdev->port->ieee1284.phase = phase; 455 456 return 0; 457 } 458 case PPGETPHASE: 459 { 460 int phase; 461 462 if (pp->flags & PP_CLAIMED) 463 phase = pp->pdev->port->ieee1284.phase; 464 else 465 phase = pp->state.phase; 466 if (copy_to_user(argp, &phase, sizeof(phase))) 467 return -EFAULT; 468 return 0; 469 } 470 case PPGETMODES: 471 { 472 unsigned int modes; 473 474 port = parport_find_number(minor); 475 if (!port) 476 return -ENODEV; 477 478 modes = port->modes; 479 parport_put_port(port); 480 if (copy_to_user(argp, &modes, sizeof(modes))) 481 return -EFAULT; 482 return 0; 483 } 484 case PPSETFLAGS: 485 { 486 int uflags; 487 488 if (copy_from_user(&uflags, argp, sizeof(uflags))) 489 return -EFAULT; 490 pp->flags &= ~PP_FLAGMASK; 491 pp->flags |= (uflags & PP_FLAGMASK); 492 return 0; 493 } 494 case PPGETFLAGS: 495 { 496 int uflags; 497 498 uflags = pp->flags & PP_FLAGMASK; 499 if (copy_to_user(argp, &uflags, sizeof(uflags))) 500 return -EFAULT; 501 return 0; 502 } 503 } /* end switch() */ 504 505 /* Everything else requires the port to be claimed, so check 506 * that now. */ 507 if ((pp->flags & PP_CLAIMED) == 0) { 508 pr_debug(CHRDEV "%x: claim the port first\n", minor); 509 return -EINVAL; 510 } 511 512 port = pp->pdev->port; 513 switch (cmd) { 514 struct ieee1284_info *info; 515 unsigned char reg; 516 unsigned char mask; 517 int mode; 518 s32 time32[2]; 519 s64 time64[2]; 520 struct timespec64 ts; 521 int ret; 522 523 case PPRSTATUS: 524 reg = parport_read_status(port); 525 if (copy_to_user(argp, ®, sizeof(reg))) 526 return -EFAULT; 527 return 0; 528 case PPRDATA: 529 reg = parport_read_data(port); 530 if (copy_to_user(argp, ®, sizeof(reg))) 531 return -EFAULT; 532 return 0; 533 case PPRCONTROL: 534 reg = parport_read_control(port); 535 if (copy_to_user(argp, ®, sizeof(reg))) 536 return -EFAULT; 537 return 0; 538 case PPYIELD: 539 parport_yield_blocking(pp->pdev); 540 return 0; 541 542 case PPRELEASE: 543 /* Save the state machine's state. */ 544 info = &pp->pdev->port->ieee1284; 545 pp->state.mode = info->mode; 546 pp->state.phase = info->phase; 547 info->mode = pp->saved_state.mode; 548 info->phase = pp->saved_state.phase; 549 parport_release(pp->pdev); 550 pp->flags &= ~PP_CLAIMED; 551 return 0; 552 553 case PPWCONTROL: 554 if (copy_from_user(®, argp, sizeof(reg))) 555 return -EFAULT; 556 parport_write_control(port, reg); 557 return 0; 558 559 case PPWDATA: 560 if (copy_from_user(®, argp, sizeof(reg))) 561 return -EFAULT; 562 parport_write_data(port, reg); 563 return 0; 564 565 case PPFCONTROL: 566 if (copy_from_user(&mask, argp, 567 sizeof(mask))) 568 return -EFAULT; 569 if (copy_from_user(®, 1 + (unsigned char __user *) arg, 570 sizeof(reg))) 571 return -EFAULT; 572 parport_frob_control(port, mask, reg); 573 return 0; 574 575 case PPDATADIR: 576 if (copy_from_user(&mode, argp, sizeof(mode))) 577 return -EFAULT; 578 if (mode) 579 port->ops->data_reverse(port); 580 else 581 port->ops->data_forward(port); 582 return 0; 583 584 case PPNEGOT: 585 if (copy_from_user(&mode, argp, sizeof(mode))) 586 return -EFAULT; 587 switch ((ret = parport_negotiate(port, mode))) { 588 case 0: break; 589 case -1: /* handshake failed, peripheral not IEEE 1284 */ 590 ret = -EIO; 591 break; 592 case 1: /* handshake succeeded, peripheral rejected mode */ 593 ret = -ENXIO; 594 break; 595 } 596 pp_enable_irq(pp); 597 return ret; 598 599 case PPWCTLONIRQ: 600 if (copy_from_user(®, argp, sizeof(reg))) 601 return -EFAULT; 602 603 /* Remember what to set the control lines to, for next 604 * time we get an interrupt. */ 605 pp->irqctl = reg; 606 pp->irqresponse = 1; 607 return 0; 608 609 case PPCLRIRQ: 610 ret = atomic_read(&pp->irqc); 611 if (copy_to_user(argp, &ret, sizeof(ret))) 612 return -EFAULT; 613 atomic_sub(ret, &pp->irqc); 614 return 0; 615 616 case PPSETTIME32: 617 if (copy_from_user(time32, argp, sizeof(time32))) 618 return -EFAULT; 619 620 return pp_set_timeout(pp->pdev, time32[0], time32[1]); 621 622 case PPSETTIME64: 623 if (copy_from_user(time64, argp, sizeof(time64))) 624 return -EFAULT; 625 626 return pp_set_timeout(pp->pdev, time64[0], time64[1]); 627 628 case PPGETTIME32: 629 jiffies_to_timespec64(pp->pdev->timeout, &ts); 630 time32[0] = ts.tv_sec; 631 time32[1] = ts.tv_nsec / NSEC_PER_USEC; 632 if ((time32[0] < 0) || (time32[1] < 0)) 633 return -EINVAL; 634 635 if (copy_to_user(argp, time32, sizeof(time32))) 636 return -EFAULT; 637 638 return 0; 639 640 case PPGETTIME64: 641 jiffies_to_timespec64(pp->pdev->timeout, &ts); 642 time64[0] = ts.tv_sec; 643 time64[1] = ts.tv_nsec / NSEC_PER_USEC; 644 if ((time64[0] < 0) || (time64[1] < 0)) 645 return -EINVAL; 646 647 if (copy_to_user(argp, time64, sizeof(time64))) 648 return -EFAULT; 649 650 return 0; 651 652 default: 653 dev_dbg(&pp->pdev->dev, "What? (cmd=0x%x)\n", cmd); 654 return -EINVAL; 655 } 656 657 /* Keep the compiler happy */ 658 return 0; 659 } 660 661 static long pp_ioctl(struct file *file, unsigned int cmd, unsigned long arg) 662 { 663 long ret; 664 665 mutex_lock(&pp_do_mutex); 666 ret = pp_do_ioctl(file, cmd, arg); 667 mutex_unlock(&pp_do_mutex); 668 return ret; 669 } 670 671 #ifdef CONFIG_COMPAT 672 static long pp_compat_ioctl(struct file *file, unsigned int cmd, 673 unsigned long arg) 674 { 675 return pp_ioctl(file, cmd, (unsigned long)compat_ptr(arg)); 676 } 677 #endif 678 679 static int pp_open(struct inode *inode, struct file *file) 680 { 681 unsigned int minor = iminor(inode); 682 struct pp_struct *pp; 683 684 if (minor >= PARPORT_MAX) 685 return -ENXIO; 686 687 pp = kmalloc(sizeof(struct pp_struct), GFP_KERNEL); 688 if (!pp) 689 return -ENOMEM; 690 691 pp->state.mode = IEEE1284_MODE_COMPAT; 692 pp->state.phase = init_phase(pp->state.mode); 693 pp->flags = 0; 694 pp->irqresponse = 0; 695 atomic_set(&pp->irqc, 0); 696 init_waitqueue_head(&pp->irq_wait); 697 698 /* Defer the actual device registration until the first claim. 699 * That way, we know whether or not the driver wants to have 700 * exclusive access to the port (PPEXCL). 701 */ 702 pp->pdev = NULL; 703 file->private_data = pp; 704 705 return 0; 706 } 707 708 static int pp_release(struct inode *inode, struct file *file) 709 { 710 unsigned int minor = iminor(inode); 711 struct pp_struct *pp = file->private_data; 712 int compat_negot; 713 714 compat_negot = 0; 715 if (!(pp->flags & PP_CLAIMED) && pp->pdev && 716 (pp->state.mode != IEEE1284_MODE_COMPAT)) { 717 struct ieee1284_info *info; 718 719 /* parport released, but not in compatibility mode */ 720 parport_claim_or_block(pp->pdev); 721 pp->flags |= PP_CLAIMED; 722 info = &pp->pdev->port->ieee1284; 723 pp->saved_state.mode = info->mode; 724 pp->saved_state.phase = info->phase; 725 info->mode = pp->state.mode; 726 info->phase = pp->state.phase; 727 compat_negot = 1; 728 } else if ((pp->flags & PP_CLAIMED) && pp->pdev && 729 (pp->pdev->port->ieee1284.mode != IEEE1284_MODE_COMPAT)) { 730 compat_negot = 2; 731 } 732 if (compat_negot) { 733 parport_negotiate(pp->pdev->port, IEEE1284_MODE_COMPAT); 734 dev_dbg(&pp->pdev->dev, 735 "negotiated back to compatibility mode because user-space forgot\n"); 736 } 737 738 if (pp->flags & PP_CLAIMED) { 739 struct ieee1284_info *info; 740 741 info = &pp->pdev->port->ieee1284; 742 pp->state.mode = info->mode; 743 pp->state.phase = info->phase; 744 info->mode = pp->saved_state.mode; 745 info->phase = pp->saved_state.phase; 746 parport_release(pp->pdev); 747 if (compat_negot != 1) { 748 pr_debug(CHRDEV "%x: released pardevice " 749 "because user-space forgot\n", minor); 750 } 751 } 752 753 if (pp->pdev) { 754 parport_unregister_device(pp->pdev); 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 struct device *ret; 796 797 if (devices[port->number]) 798 return; 799 800 ret = device_create(ppdev_class, port->dev, 801 MKDEV(PP_MAJOR, port->number), NULL, 802 "parport%d", port->number); 803 if (IS_ERR(ret)) { 804 pr_err("Failed to create device parport%d\n", 805 port->number); 806 return; 807 } 808 devices[port->number] = ret; 809 } 810 811 static void pp_detach(struct parport *port) 812 { 813 if (!devices[port->number]) 814 return; 815 816 device_destroy(ppdev_class, MKDEV(PP_MAJOR, port->number)); 817 devices[port->number] = NULL; 818 } 819 820 static int pp_probe(struct pardevice *par_dev) 821 { 822 struct device_driver *drv = par_dev->dev.driver; 823 int len = strlen(drv->name); 824 825 if (strncmp(par_dev->name, drv->name, len)) 826 return -ENODEV; 827 828 return 0; 829 } 830 831 static struct parport_driver pp_driver = { 832 .name = CHRDEV, 833 .probe = pp_probe, 834 .match_port = pp_attach, 835 .detach = pp_detach, 836 .devmodel = true, 837 }; 838 839 static int __init ppdev_init(void) 840 { 841 int err = 0; 842 843 if (register_chrdev(PP_MAJOR, CHRDEV, &pp_fops)) { 844 pr_warn(CHRDEV ": unable to get major %d\n", PP_MAJOR); 845 return -EIO; 846 } 847 ppdev_class = class_create(THIS_MODULE, CHRDEV); 848 if (IS_ERR(ppdev_class)) { 849 err = PTR_ERR(ppdev_class); 850 goto out_chrdev; 851 } 852 err = parport_register_driver(&pp_driver); 853 if (err < 0) { 854 pr_warn(CHRDEV ": unable to register with parport\n"); 855 goto out_class; 856 } 857 858 pr_info(PP_VERSION "\n"); 859 goto out; 860 861 out_class: 862 class_destroy(ppdev_class); 863 out_chrdev: 864 unregister_chrdev(PP_MAJOR, CHRDEV); 865 out: 866 return err; 867 } 868 869 static void __exit ppdev_cleanup(void) 870 { 871 /* Clean up all parport stuff */ 872 parport_unregister_driver(&pp_driver); 873 class_destroy(ppdev_class); 874 unregister_chrdev(PP_MAJOR, CHRDEV); 875 } 876 877 module_init(ppdev_init); 878 module_exit(ppdev_cleanup); 879 880 MODULE_LICENSE("GPL"); 881 MODULE_ALIAS_CHARDEV_MAJOR(PP_MAJOR); 882