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/signal.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 int rc = 0; 294 295 name = kasprintf(GFP_KERNEL, CHRDEV "%x", minor); 296 if (name == NULL) 297 return -ENOMEM; 298 299 port = parport_find_number(minor); 300 if (!port) { 301 pr_warn("%s: no associated port!\n", name); 302 rc = -ENXIO; 303 goto err; 304 } 305 306 memset(&ppdev_cb, 0, sizeof(ppdev_cb)); 307 ppdev_cb.irq_func = pp_irq; 308 ppdev_cb.flags = (pp->flags & PP_EXCL) ? PARPORT_FLAG_EXCL : 0; 309 ppdev_cb.private = pp; 310 pdev = parport_register_dev_model(port, name, &ppdev_cb, minor); 311 parport_put_port(port); 312 313 if (!pdev) { 314 pr_warn("%s: failed to register device!\n", name); 315 rc = -ENXIO; 316 goto err; 317 } 318 319 pp->pdev = pdev; 320 dev_dbg(&pdev->dev, "registered pardevice\n"); 321 err: 322 kfree(name); 323 return rc; 324 } 325 326 static enum ieee1284_phase init_phase(int mode) 327 { 328 switch (mode & ~(IEEE1284_DEVICEID 329 | IEEE1284_ADDR)) { 330 case IEEE1284_MODE_NIBBLE: 331 case IEEE1284_MODE_BYTE: 332 return IEEE1284_PH_REV_IDLE; 333 } 334 return IEEE1284_PH_FWD_IDLE; 335 } 336 337 static int pp_set_timeout(struct pardevice *pdev, long tv_sec, int tv_usec) 338 { 339 long to_jiffies; 340 341 if ((tv_sec < 0) || (tv_usec < 0)) 342 return -EINVAL; 343 344 to_jiffies = usecs_to_jiffies(tv_usec); 345 to_jiffies += tv_sec * HZ; 346 if (to_jiffies <= 0) 347 return -EINVAL; 348 349 pdev->timeout = to_jiffies; 350 return 0; 351 } 352 353 static int pp_do_ioctl(struct file *file, unsigned int cmd, unsigned long arg) 354 { 355 unsigned int minor = iminor(file_inode(file)); 356 struct pp_struct *pp = file->private_data; 357 struct parport *port; 358 void __user *argp = (void __user *)arg; 359 360 /* First handle the cases that don't take arguments. */ 361 switch (cmd) { 362 case PPCLAIM: 363 { 364 struct ieee1284_info *info; 365 int ret; 366 367 if (pp->flags & PP_CLAIMED) { 368 dev_dbg(&pp->pdev->dev, "you've already got it!\n"); 369 return -EINVAL; 370 } 371 372 /* Deferred device registration. */ 373 if (!pp->pdev) { 374 int err = register_device(minor, pp); 375 376 if (err) 377 return err; 378 } 379 380 ret = parport_claim_or_block(pp->pdev); 381 if (ret < 0) 382 return ret; 383 384 pp->flags |= PP_CLAIMED; 385 386 /* For interrupt-reporting to work, we need to be 387 * informed of each interrupt. */ 388 pp_enable_irq(pp); 389 390 /* We may need to fix up the state machine. */ 391 info = &pp->pdev->port->ieee1284; 392 pp->saved_state.mode = info->mode; 393 pp->saved_state.phase = info->phase; 394 info->mode = pp->state.mode; 395 info->phase = pp->state.phase; 396 pp->default_inactivity = parport_set_timeout(pp->pdev, 0); 397 parport_set_timeout(pp->pdev, pp->default_inactivity); 398 399 return 0; 400 } 401 case PPEXCL: 402 if (pp->pdev) { 403 dev_dbg(&pp->pdev->dev, 404 "too late for PPEXCL; already registered\n"); 405 if (pp->flags & PP_EXCL) 406 /* But it's not really an error. */ 407 return 0; 408 /* There's no chance of making the driver happy. */ 409 return -EINVAL; 410 } 411 412 /* Just remember to register the device exclusively 413 * when we finally do the registration. */ 414 pp->flags |= PP_EXCL; 415 return 0; 416 case PPSETMODE: 417 { 418 int mode; 419 420 if (copy_from_user(&mode, argp, sizeof(mode))) 421 return -EFAULT; 422 /* FIXME: validate mode */ 423 pp->state.mode = mode; 424 pp->state.phase = init_phase(mode); 425 426 if (pp->flags & PP_CLAIMED) { 427 pp->pdev->port->ieee1284.mode = mode; 428 pp->pdev->port->ieee1284.phase = pp->state.phase; 429 } 430 431 return 0; 432 } 433 case PPGETMODE: 434 { 435 int mode; 436 437 if (pp->flags & PP_CLAIMED) 438 mode = pp->pdev->port->ieee1284.mode; 439 else 440 mode = pp->state.mode; 441 442 if (copy_to_user(argp, &mode, sizeof(mode))) 443 return -EFAULT; 444 return 0; 445 } 446 case PPSETPHASE: 447 { 448 int phase; 449 450 if (copy_from_user(&phase, argp, sizeof(phase))) 451 return -EFAULT; 452 453 /* FIXME: validate phase */ 454 pp->state.phase = phase; 455 456 if (pp->flags & PP_CLAIMED) 457 pp->pdev->port->ieee1284.phase = phase; 458 459 return 0; 460 } 461 case PPGETPHASE: 462 { 463 int phase; 464 465 if (pp->flags & PP_CLAIMED) 466 phase = pp->pdev->port->ieee1284.phase; 467 else 468 phase = pp->state.phase; 469 if (copy_to_user(argp, &phase, sizeof(phase))) 470 return -EFAULT; 471 return 0; 472 } 473 case PPGETMODES: 474 { 475 unsigned int modes; 476 477 port = parport_find_number(minor); 478 if (!port) 479 return -ENODEV; 480 481 modes = port->modes; 482 parport_put_port(port); 483 if (copy_to_user(argp, &modes, sizeof(modes))) 484 return -EFAULT; 485 return 0; 486 } 487 case PPSETFLAGS: 488 { 489 int uflags; 490 491 if (copy_from_user(&uflags, argp, sizeof(uflags))) 492 return -EFAULT; 493 pp->flags &= ~PP_FLAGMASK; 494 pp->flags |= (uflags & PP_FLAGMASK); 495 return 0; 496 } 497 case PPGETFLAGS: 498 { 499 int uflags; 500 501 uflags = pp->flags & PP_FLAGMASK; 502 if (copy_to_user(argp, &uflags, sizeof(uflags))) 503 return -EFAULT; 504 return 0; 505 } 506 } /* end switch() */ 507 508 /* Everything else requires the port to be claimed, so check 509 * that now. */ 510 if ((pp->flags & PP_CLAIMED) == 0) { 511 pr_debug(CHRDEV "%x: claim the port first\n", minor); 512 return -EINVAL; 513 } 514 515 port = pp->pdev->port; 516 switch (cmd) { 517 struct ieee1284_info *info; 518 unsigned char reg; 519 unsigned char mask; 520 int mode; 521 s32 time32[2]; 522 s64 time64[2]; 523 struct timespec64 ts; 524 int ret; 525 526 case PPRSTATUS: 527 reg = parport_read_status(port); 528 if (copy_to_user(argp, ®, sizeof(reg))) 529 return -EFAULT; 530 return 0; 531 case PPRDATA: 532 reg = parport_read_data(port); 533 if (copy_to_user(argp, ®, sizeof(reg))) 534 return -EFAULT; 535 return 0; 536 case PPRCONTROL: 537 reg = parport_read_control(port); 538 if (copy_to_user(argp, ®, sizeof(reg))) 539 return -EFAULT; 540 return 0; 541 case PPYIELD: 542 parport_yield_blocking(pp->pdev); 543 return 0; 544 545 case PPRELEASE: 546 /* Save the state machine's state. */ 547 info = &pp->pdev->port->ieee1284; 548 pp->state.mode = info->mode; 549 pp->state.phase = info->phase; 550 info->mode = pp->saved_state.mode; 551 info->phase = pp->saved_state.phase; 552 parport_release(pp->pdev); 553 pp->flags &= ~PP_CLAIMED; 554 return 0; 555 556 case PPWCONTROL: 557 if (copy_from_user(®, argp, sizeof(reg))) 558 return -EFAULT; 559 parport_write_control(port, reg); 560 return 0; 561 562 case PPWDATA: 563 if (copy_from_user(®, argp, sizeof(reg))) 564 return -EFAULT; 565 parport_write_data(port, reg); 566 return 0; 567 568 case PPFCONTROL: 569 if (copy_from_user(&mask, argp, 570 sizeof(mask))) 571 return -EFAULT; 572 if (copy_from_user(®, 1 + (unsigned char __user *) arg, 573 sizeof(reg))) 574 return -EFAULT; 575 parport_frob_control(port, mask, reg); 576 return 0; 577 578 case PPDATADIR: 579 if (copy_from_user(&mode, argp, sizeof(mode))) 580 return -EFAULT; 581 if (mode) 582 port->ops->data_reverse(port); 583 else 584 port->ops->data_forward(port); 585 return 0; 586 587 case PPNEGOT: 588 if (copy_from_user(&mode, argp, sizeof(mode))) 589 return -EFAULT; 590 switch ((ret = parport_negotiate(port, mode))) { 591 case 0: break; 592 case -1: /* handshake failed, peripheral not IEEE 1284 */ 593 ret = -EIO; 594 break; 595 case 1: /* handshake succeeded, peripheral rejected mode */ 596 ret = -ENXIO; 597 break; 598 } 599 pp_enable_irq(pp); 600 return ret; 601 602 case PPWCTLONIRQ: 603 if (copy_from_user(®, argp, sizeof(reg))) 604 return -EFAULT; 605 606 /* Remember what to set the control lines to, for next 607 * time we get an interrupt. */ 608 pp->irqctl = reg; 609 pp->irqresponse = 1; 610 return 0; 611 612 case PPCLRIRQ: 613 ret = atomic_read(&pp->irqc); 614 if (copy_to_user(argp, &ret, sizeof(ret))) 615 return -EFAULT; 616 atomic_sub(ret, &pp->irqc); 617 return 0; 618 619 case PPSETTIME32: 620 if (copy_from_user(time32, argp, sizeof(time32))) 621 return -EFAULT; 622 623 return pp_set_timeout(pp->pdev, time32[0], time32[1]); 624 625 case PPSETTIME64: 626 if (copy_from_user(time64, argp, sizeof(time64))) 627 return -EFAULT; 628 629 return pp_set_timeout(pp->pdev, time64[0], time64[1]); 630 631 case PPGETTIME32: 632 jiffies_to_timespec64(pp->pdev->timeout, &ts); 633 time32[0] = ts.tv_sec; 634 time32[1] = ts.tv_nsec / NSEC_PER_USEC; 635 if ((time32[0] < 0) || (time32[1] < 0)) 636 return -EINVAL; 637 638 if (copy_to_user(argp, time32, sizeof(time32))) 639 return -EFAULT; 640 641 return 0; 642 643 case PPGETTIME64: 644 jiffies_to_timespec64(pp->pdev->timeout, &ts); 645 time64[0] = ts.tv_sec; 646 time64[1] = ts.tv_nsec / NSEC_PER_USEC; 647 if ((time64[0] < 0) || (time64[1] < 0)) 648 return -EINVAL; 649 650 if (copy_to_user(argp, time64, sizeof(time64))) 651 return -EFAULT; 652 653 return 0; 654 655 default: 656 dev_dbg(&pp->pdev->dev, "What? (cmd=0x%x)\n", cmd); 657 return -EINVAL; 658 } 659 660 /* Keep the compiler happy */ 661 return 0; 662 } 663 664 static long pp_ioctl(struct file *file, unsigned int cmd, unsigned long arg) 665 { 666 long ret; 667 668 mutex_lock(&pp_do_mutex); 669 ret = pp_do_ioctl(file, cmd, arg); 670 mutex_unlock(&pp_do_mutex); 671 return ret; 672 } 673 674 #ifdef CONFIG_COMPAT 675 static long pp_compat_ioctl(struct file *file, unsigned int cmd, 676 unsigned long arg) 677 { 678 return pp_ioctl(file, cmd, (unsigned long)compat_ptr(arg)); 679 } 680 #endif 681 682 static int pp_open(struct inode *inode, struct file *file) 683 { 684 unsigned int minor = iminor(inode); 685 struct pp_struct *pp; 686 687 if (minor >= PARPORT_MAX) 688 return -ENXIO; 689 690 pp = kmalloc(sizeof(struct pp_struct), GFP_KERNEL); 691 if (!pp) 692 return -ENOMEM; 693 694 pp->state.mode = IEEE1284_MODE_COMPAT; 695 pp->state.phase = init_phase(pp->state.mode); 696 pp->flags = 0; 697 pp->irqresponse = 0; 698 atomic_set(&pp->irqc, 0); 699 init_waitqueue_head(&pp->irq_wait); 700 701 /* Defer the actual device registration until the first claim. 702 * That way, we know whether or not the driver wants to have 703 * exclusive access to the port (PPEXCL). 704 */ 705 pp->pdev = NULL; 706 file->private_data = pp; 707 708 return 0; 709 } 710 711 static int pp_release(struct inode *inode, struct file *file) 712 { 713 unsigned int minor = iminor(inode); 714 struct pp_struct *pp = file->private_data; 715 int compat_negot; 716 717 compat_negot = 0; 718 if (!(pp->flags & PP_CLAIMED) && pp->pdev && 719 (pp->state.mode != IEEE1284_MODE_COMPAT)) { 720 struct ieee1284_info *info; 721 722 /* parport released, but not in compatibility mode */ 723 parport_claim_or_block(pp->pdev); 724 pp->flags |= PP_CLAIMED; 725 info = &pp->pdev->port->ieee1284; 726 pp->saved_state.mode = info->mode; 727 pp->saved_state.phase = info->phase; 728 info->mode = pp->state.mode; 729 info->phase = pp->state.phase; 730 compat_negot = 1; 731 } else if ((pp->flags & PP_CLAIMED) && pp->pdev && 732 (pp->pdev->port->ieee1284.mode != IEEE1284_MODE_COMPAT)) { 733 compat_negot = 2; 734 } 735 if (compat_negot) { 736 parport_negotiate(pp->pdev->port, IEEE1284_MODE_COMPAT); 737 dev_dbg(&pp->pdev->dev, 738 "negotiated back to compatibility mode because user-space forgot\n"); 739 } 740 741 if (pp->flags & PP_CLAIMED) { 742 struct ieee1284_info *info; 743 744 info = &pp->pdev->port->ieee1284; 745 pp->state.mode = info->mode; 746 pp->state.phase = info->phase; 747 info->mode = pp->saved_state.mode; 748 info->phase = pp->saved_state.phase; 749 parport_release(pp->pdev); 750 if (compat_negot != 1) { 751 pr_debug(CHRDEV "%x: released pardevice " 752 "because user-space forgot\n", minor); 753 } 754 } 755 756 if (pp->pdev) { 757 parport_unregister_device(pp->pdev); 758 pp->pdev = NULL; 759 pr_debug(CHRDEV "%x: unregistered pardevice\n", minor); 760 } 761 762 kfree(pp); 763 764 return 0; 765 } 766 767 /* No kernel lock held - fine */ 768 static unsigned int pp_poll(struct file *file, poll_table *wait) 769 { 770 struct pp_struct *pp = file->private_data; 771 unsigned int mask = 0; 772 773 poll_wait(file, &pp->irq_wait, wait); 774 if (atomic_read(&pp->irqc)) 775 mask |= POLLIN | POLLRDNORM; 776 777 return mask; 778 } 779 780 static struct class *ppdev_class; 781 782 static const struct file_operations pp_fops = { 783 .owner = THIS_MODULE, 784 .llseek = no_llseek, 785 .read = pp_read, 786 .write = pp_write, 787 .poll = pp_poll, 788 .unlocked_ioctl = pp_ioctl, 789 #ifdef CONFIG_COMPAT 790 .compat_ioctl = pp_compat_ioctl, 791 #endif 792 .open = pp_open, 793 .release = pp_release, 794 }; 795 796 static void pp_attach(struct parport *port) 797 { 798 struct device *ret; 799 800 if (devices[port->number]) 801 return; 802 803 ret = device_create(ppdev_class, port->dev, 804 MKDEV(PP_MAJOR, port->number), NULL, 805 "parport%d", port->number); 806 if (IS_ERR(ret)) { 807 pr_err("Failed to create device parport%d\n", 808 port->number); 809 return; 810 } 811 devices[port->number] = ret; 812 } 813 814 static void pp_detach(struct parport *port) 815 { 816 if (!devices[port->number]) 817 return; 818 819 device_destroy(ppdev_class, MKDEV(PP_MAJOR, port->number)); 820 devices[port->number] = NULL; 821 } 822 823 static int pp_probe(struct pardevice *par_dev) 824 { 825 struct device_driver *drv = par_dev->dev.driver; 826 int len = strlen(drv->name); 827 828 if (strncmp(par_dev->name, drv->name, len)) 829 return -ENODEV; 830 831 return 0; 832 } 833 834 static struct parport_driver pp_driver = { 835 .name = CHRDEV, 836 .probe = pp_probe, 837 .match_port = pp_attach, 838 .detach = pp_detach, 839 .devmodel = true, 840 }; 841 842 static int __init ppdev_init(void) 843 { 844 int err = 0; 845 846 if (register_chrdev(PP_MAJOR, CHRDEV, &pp_fops)) { 847 pr_warn(CHRDEV ": unable to get major %d\n", PP_MAJOR); 848 return -EIO; 849 } 850 ppdev_class = class_create(THIS_MODULE, CHRDEV); 851 if (IS_ERR(ppdev_class)) { 852 err = PTR_ERR(ppdev_class); 853 goto out_chrdev; 854 } 855 err = parport_register_driver(&pp_driver); 856 if (err < 0) { 857 pr_warn(CHRDEV ": unable to register with parport\n"); 858 goto out_class; 859 } 860 861 pr_info(PP_VERSION "\n"); 862 goto out; 863 864 out_class: 865 class_destroy(ppdev_class); 866 out_chrdev: 867 unregister_chrdev(PP_MAJOR, CHRDEV); 868 out: 869 return err; 870 } 871 872 static void __exit ppdev_cleanup(void) 873 { 874 /* Clean up all parport stuff */ 875 parport_unregister_driver(&pp_driver); 876 class_destroy(ppdev_class); 877 unregister_chrdev(PP_MAJOR, CHRDEV); 878 } 879 880 module_init(ppdev_init); 881 module_exit(ppdev_cleanup); 882 883 MODULE_LICENSE("GPL"); 884 MODULE_ALIAS_CHARDEV_MAJOR(PP_MAJOR); 885