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 int index; 88 }; 89 90 /* should we use PARDEVICE_MAX here? */ 91 static struct device *devices[PARPORT_MAX]; 92 93 static DEFINE_IDA(ida_index); 94 95 /* pp_struct.flags bitfields */ 96 #define PP_CLAIMED (1<<0) 97 #define PP_EXCL (1<<1) 98 99 /* Other constants */ 100 #define PP_INTERRUPT_TIMEOUT (10 * HZ) /* 10s */ 101 #define PP_BUFFER_SIZE 1024 102 #define PARDEVICE_MAX 8 103 104 /* ROUND_UP macro from fs/select.c */ 105 #define ROUND_UP(x,y) (((x)+(y)-1)/(y)) 106 107 static DEFINE_MUTEX(pp_do_mutex); 108 109 /* define fixed sized ioctl cmd for y2038 migration */ 110 #define PPGETTIME32 _IOR(PP_IOCTL, 0x95, s32[2]) 111 #define PPSETTIME32 _IOW(PP_IOCTL, 0x96, s32[2]) 112 #define PPGETTIME64 _IOR(PP_IOCTL, 0x95, s64[2]) 113 #define PPSETTIME64 _IOW(PP_IOCTL, 0x96, s64[2]) 114 115 static inline void pp_enable_irq(struct pp_struct *pp) 116 { 117 struct parport *port = pp->pdev->port; 118 119 port->ops->enable_irq(port); 120 } 121 122 static ssize_t pp_read(struct file *file, char __user *buf, size_t count, 123 loff_t *ppos) 124 { 125 unsigned int minor = iminor(file_inode(file)); 126 struct pp_struct *pp = file->private_data; 127 char *kbuffer; 128 ssize_t bytes_read = 0; 129 struct parport *pport; 130 int mode; 131 132 if (!(pp->flags & PP_CLAIMED)) { 133 /* Don't have the port claimed */ 134 pr_debug(CHRDEV "%x: claim the port first\n", minor); 135 return -EINVAL; 136 } 137 138 /* Trivial case. */ 139 if (count == 0) 140 return 0; 141 142 kbuffer = kmalloc(min_t(size_t, count, PP_BUFFER_SIZE), GFP_KERNEL); 143 if (!kbuffer) 144 return -ENOMEM; 145 pport = pp->pdev->port; 146 mode = pport->ieee1284.mode & ~(IEEE1284_DEVICEID | IEEE1284_ADDR); 147 148 parport_set_timeout(pp->pdev, 149 (file->f_flags & O_NONBLOCK) ? 150 PARPORT_INACTIVITY_O_NONBLOCK : 151 pp->default_inactivity); 152 153 while (bytes_read == 0) { 154 ssize_t need = min_t(unsigned long, count, PP_BUFFER_SIZE); 155 156 if (mode == IEEE1284_MODE_EPP) { 157 /* various specials for EPP mode */ 158 int flags = 0; 159 size_t (*fn)(struct parport *, void *, size_t, int); 160 161 if (pp->flags & PP_W91284PIC) 162 flags |= PARPORT_W91284PIC; 163 if (pp->flags & PP_FASTREAD) 164 flags |= PARPORT_EPP_FAST; 165 if (pport->ieee1284.mode & IEEE1284_ADDR) 166 fn = pport->ops->epp_read_addr; 167 else 168 fn = pport->ops->epp_read_data; 169 bytes_read = (*fn)(pport, kbuffer, need, flags); 170 } else { 171 bytes_read = parport_read(pport, kbuffer, need); 172 } 173 174 if (bytes_read != 0) 175 break; 176 177 if (file->f_flags & O_NONBLOCK) { 178 bytes_read = -EAGAIN; 179 break; 180 } 181 182 if (signal_pending(current)) { 183 bytes_read = -ERESTARTSYS; 184 break; 185 } 186 187 cond_resched(); 188 } 189 190 parport_set_timeout(pp->pdev, pp->default_inactivity); 191 192 if (bytes_read > 0 && copy_to_user(buf, kbuffer, bytes_read)) 193 bytes_read = -EFAULT; 194 195 kfree(kbuffer); 196 pp_enable_irq(pp); 197 return bytes_read; 198 } 199 200 static ssize_t pp_write(struct file *file, const char __user *buf, 201 size_t count, loff_t *ppos) 202 { 203 unsigned int minor = iminor(file_inode(file)); 204 struct pp_struct *pp = file->private_data; 205 char *kbuffer; 206 ssize_t bytes_written = 0; 207 ssize_t wrote; 208 int mode; 209 struct parport *pport; 210 211 if (!(pp->flags & PP_CLAIMED)) { 212 /* Don't have the port claimed */ 213 pr_debug(CHRDEV "%x: claim the port first\n", minor); 214 return -EINVAL; 215 } 216 217 kbuffer = kmalloc(min_t(size_t, count, PP_BUFFER_SIZE), GFP_KERNEL); 218 if (!kbuffer) 219 return -ENOMEM; 220 221 pport = pp->pdev->port; 222 mode = pport->ieee1284.mode & ~(IEEE1284_DEVICEID | IEEE1284_ADDR); 223 224 parport_set_timeout(pp->pdev, 225 (file->f_flags & O_NONBLOCK) ? 226 PARPORT_INACTIVITY_O_NONBLOCK : 227 pp->default_inactivity); 228 229 while (bytes_written < count) { 230 ssize_t n = min_t(unsigned long, count - bytes_written, PP_BUFFER_SIZE); 231 232 if (copy_from_user(kbuffer, buf + bytes_written, n)) { 233 bytes_written = -EFAULT; 234 break; 235 } 236 237 if ((pp->flags & PP_FASTWRITE) && (mode == IEEE1284_MODE_EPP)) { 238 /* do a fast EPP write */ 239 if (pport->ieee1284.mode & IEEE1284_ADDR) { 240 wrote = pport->ops->epp_write_addr(pport, 241 kbuffer, n, PARPORT_EPP_FAST); 242 } else { 243 wrote = pport->ops->epp_write_data(pport, 244 kbuffer, n, PARPORT_EPP_FAST); 245 } 246 } else { 247 wrote = parport_write(pp->pdev->port, kbuffer, n); 248 } 249 250 if (wrote <= 0) { 251 if (!bytes_written) 252 bytes_written = wrote; 253 break; 254 } 255 256 bytes_written += wrote; 257 258 if (file->f_flags & O_NONBLOCK) { 259 if (!bytes_written) 260 bytes_written = -EAGAIN; 261 break; 262 } 263 264 if (signal_pending(current)) 265 break; 266 267 cond_resched(); 268 } 269 270 parport_set_timeout(pp->pdev, pp->default_inactivity); 271 272 kfree(kbuffer); 273 pp_enable_irq(pp); 274 return bytes_written; 275 } 276 277 static void pp_irq(void *private) 278 { 279 struct pp_struct *pp = private; 280 281 if (pp->irqresponse) { 282 parport_write_control(pp->pdev->port, pp->irqctl); 283 pp->irqresponse = 0; 284 } 285 286 atomic_inc(&pp->irqc); 287 wake_up_interruptible(&pp->irq_wait); 288 } 289 290 static int register_device(int minor, struct pp_struct *pp) 291 { 292 struct parport *port; 293 struct pardevice *pdev = NULL; 294 char *name; 295 struct pardev_cb ppdev_cb; 296 int rc = 0, index; 297 298 name = kasprintf(GFP_KERNEL, CHRDEV "%x", minor); 299 if (name == NULL) 300 return -ENOMEM; 301 302 port = parport_find_number(minor); 303 if (!port) { 304 pr_warn("%s: no associated port!\n", name); 305 rc = -ENXIO; 306 goto err; 307 } 308 309 index = ida_simple_get(&ida_index, 0, 0, GFP_KERNEL); 310 memset(&ppdev_cb, 0, sizeof(ppdev_cb)); 311 ppdev_cb.irq_func = pp_irq; 312 ppdev_cb.flags = (pp->flags & PP_EXCL) ? PARPORT_FLAG_EXCL : 0; 313 ppdev_cb.private = pp; 314 pdev = parport_register_dev_model(port, name, &ppdev_cb, index); 315 parport_put_port(port); 316 317 if (!pdev) { 318 pr_warn("%s: failed to register device!\n", name); 319 rc = -ENXIO; 320 ida_simple_remove(&ida_index, index); 321 goto err; 322 } 323 324 pp->pdev = pdev; 325 pp->index = index; 326 dev_dbg(&pdev->dev, "registered pardevice\n"); 327 err: 328 kfree(name); 329 return rc; 330 } 331 332 static enum ieee1284_phase init_phase(int mode) 333 { 334 switch (mode & ~(IEEE1284_DEVICEID 335 | IEEE1284_ADDR)) { 336 case IEEE1284_MODE_NIBBLE: 337 case IEEE1284_MODE_BYTE: 338 return IEEE1284_PH_REV_IDLE; 339 } 340 return IEEE1284_PH_FWD_IDLE; 341 } 342 343 static int pp_set_timeout(struct pardevice *pdev, long tv_sec, int tv_usec) 344 { 345 long to_jiffies; 346 347 if ((tv_sec < 0) || (tv_usec < 0)) 348 return -EINVAL; 349 350 to_jiffies = usecs_to_jiffies(tv_usec); 351 to_jiffies += tv_sec * HZ; 352 if (to_jiffies <= 0) 353 return -EINVAL; 354 355 pdev->timeout = to_jiffies; 356 return 0; 357 } 358 359 static int pp_do_ioctl(struct file *file, unsigned int cmd, unsigned long arg) 360 { 361 unsigned int minor = iminor(file_inode(file)); 362 struct pp_struct *pp = file->private_data; 363 struct parport *port; 364 void __user *argp = (void __user *)arg; 365 366 /* First handle the cases that don't take arguments. */ 367 switch (cmd) { 368 case PPCLAIM: 369 { 370 struct ieee1284_info *info; 371 int ret; 372 373 if (pp->flags & PP_CLAIMED) { 374 dev_dbg(&pp->pdev->dev, "you've already got it!\n"); 375 return -EINVAL; 376 } 377 378 /* Deferred device registration. */ 379 if (!pp->pdev) { 380 int err = register_device(minor, pp); 381 382 if (err) 383 return err; 384 } 385 386 ret = parport_claim_or_block(pp->pdev); 387 if (ret < 0) 388 return ret; 389 390 pp->flags |= PP_CLAIMED; 391 392 /* For interrupt-reporting to work, we need to be 393 * informed of each interrupt. */ 394 pp_enable_irq(pp); 395 396 /* We may need to fix up the state machine. */ 397 info = &pp->pdev->port->ieee1284; 398 pp->saved_state.mode = info->mode; 399 pp->saved_state.phase = info->phase; 400 info->mode = pp->state.mode; 401 info->phase = pp->state.phase; 402 pp->default_inactivity = parport_set_timeout(pp->pdev, 0); 403 parport_set_timeout(pp->pdev, pp->default_inactivity); 404 405 return 0; 406 } 407 case PPEXCL: 408 if (pp->pdev) { 409 dev_dbg(&pp->pdev->dev, 410 "too late for PPEXCL; already registered\n"); 411 if (pp->flags & PP_EXCL) 412 /* But it's not really an error. */ 413 return 0; 414 /* There's no chance of making the driver happy. */ 415 return -EINVAL; 416 } 417 418 /* Just remember to register the device exclusively 419 * when we finally do the registration. */ 420 pp->flags |= PP_EXCL; 421 return 0; 422 case PPSETMODE: 423 { 424 int mode; 425 426 if (copy_from_user(&mode, argp, sizeof(mode))) 427 return -EFAULT; 428 /* FIXME: validate mode */ 429 pp->state.mode = mode; 430 pp->state.phase = init_phase(mode); 431 432 if (pp->flags & PP_CLAIMED) { 433 pp->pdev->port->ieee1284.mode = mode; 434 pp->pdev->port->ieee1284.phase = pp->state.phase; 435 } 436 437 return 0; 438 } 439 case PPGETMODE: 440 { 441 int mode; 442 443 if (pp->flags & PP_CLAIMED) 444 mode = pp->pdev->port->ieee1284.mode; 445 else 446 mode = pp->state.mode; 447 448 if (copy_to_user(argp, &mode, sizeof(mode))) 449 return -EFAULT; 450 return 0; 451 } 452 case PPSETPHASE: 453 { 454 int phase; 455 456 if (copy_from_user(&phase, argp, sizeof(phase))) 457 return -EFAULT; 458 459 /* FIXME: validate phase */ 460 pp->state.phase = phase; 461 462 if (pp->flags & PP_CLAIMED) 463 pp->pdev->port->ieee1284.phase = phase; 464 465 return 0; 466 } 467 case PPGETPHASE: 468 { 469 int phase; 470 471 if (pp->flags & PP_CLAIMED) 472 phase = pp->pdev->port->ieee1284.phase; 473 else 474 phase = pp->state.phase; 475 if (copy_to_user(argp, &phase, sizeof(phase))) 476 return -EFAULT; 477 return 0; 478 } 479 case PPGETMODES: 480 { 481 unsigned int modes; 482 483 port = parport_find_number(minor); 484 if (!port) 485 return -ENODEV; 486 487 modes = port->modes; 488 parport_put_port(port); 489 if (copy_to_user(argp, &modes, sizeof(modes))) 490 return -EFAULT; 491 return 0; 492 } 493 case PPSETFLAGS: 494 { 495 int uflags; 496 497 if (copy_from_user(&uflags, argp, sizeof(uflags))) 498 return -EFAULT; 499 pp->flags &= ~PP_FLAGMASK; 500 pp->flags |= (uflags & PP_FLAGMASK); 501 return 0; 502 } 503 case PPGETFLAGS: 504 { 505 int uflags; 506 507 uflags = pp->flags & PP_FLAGMASK; 508 if (copy_to_user(argp, &uflags, sizeof(uflags))) 509 return -EFAULT; 510 return 0; 511 } 512 } /* end switch() */ 513 514 /* Everything else requires the port to be claimed, so check 515 * that now. */ 516 if ((pp->flags & PP_CLAIMED) == 0) { 517 pr_debug(CHRDEV "%x: claim the port first\n", minor); 518 return -EINVAL; 519 } 520 521 port = pp->pdev->port; 522 switch (cmd) { 523 struct ieee1284_info *info; 524 unsigned char reg; 525 unsigned char mask; 526 int mode; 527 s32 time32[2]; 528 s64 time64[2]; 529 struct timespec64 ts; 530 int ret; 531 532 case PPRSTATUS: 533 reg = parport_read_status(port); 534 if (copy_to_user(argp, ®, sizeof(reg))) 535 return -EFAULT; 536 return 0; 537 case PPRDATA: 538 reg = parport_read_data(port); 539 if (copy_to_user(argp, ®, sizeof(reg))) 540 return -EFAULT; 541 return 0; 542 case PPRCONTROL: 543 reg = parport_read_control(port); 544 if (copy_to_user(argp, ®, sizeof(reg))) 545 return -EFAULT; 546 return 0; 547 case PPYIELD: 548 parport_yield_blocking(pp->pdev); 549 return 0; 550 551 case PPRELEASE: 552 /* Save the state machine's state. */ 553 info = &pp->pdev->port->ieee1284; 554 pp->state.mode = info->mode; 555 pp->state.phase = info->phase; 556 info->mode = pp->saved_state.mode; 557 info->phase = pp->saved_state.phase; 558 parport_release(pp->pdev); 559 pp->flags &= ~PP_CLAIMED; 560 return 0; 561 562 case PPWCONTROL: 563 if (copy_from_user(®, argp, sizeof(reg))) 564 return -EFAULT; 565 parport_write_control(port, reg); 566 return 0; 567 568 case PPWDATA: 569 if (copy_from_user(®, argp, sizeof(reg))) 570 return -EFAULT; 571 parport_write_data(port, reg); 572 return 0; 573 574 case PPFCONTROL: 575 if (copy_from_user(&mask, argp, 576 sizeof(mask))) 577 return -EFAULT; 578 if (copy_from_user(®, 1 + (unsigned char __user *) arg, 579 sizeof(reg))) 580 return -EFAULT; 581 parport_frob_control(port, mask, reg); 582 return 0; 583 584 case PPDATADIR: 585 if (copy_from_user(&mode, argp, sizeof(mode))) 586 return -EFAULT; 587 if (mode) 588 port->ops->data_reverse(port); 589 else 590 port->ops->data_forward(port); 591 return 0; 592 593 case PPNEGOT: 594 if (copy_from_user(&mode, argp, sizeof(mode))) 595 return -EFAULT; 596 switch ((ret = parport_negotiate(port, mode))) { 597 case 0: break; 598 case -1: /* handshake failed, peripheral not IEEE 1284 */ 599 ret = -EIO; 600 break; 601 case 1: /* handshake succeeded, peripheral rejected mode */ 602 ret = -ENXIO; 603 break; 604 } 605 pp_enable_irq(pp); 606 return ret; 607 608 case PPWCTLONIRQ: 609 if (copy_from_user(®, argp, sizeof(reg))) 610 return -EFAULT; 611 612 /* Remember what to set the control lines to, for next 613 * time we get an interrupt. */ 614 pp->irqctl = reg; 615 pp->irqresponse = 1; 616 return 0; 617 618 case PPCLRIRQ: 619 ret = atomic_read(&pp->irqc); 620 if (copy_to_user(argp, &ret, sizeof(ret))) 621 return -EFAULT; 622 atomic_sub(ret, &pp->irqc); 623 return 0; 624 625 case PPSETTIME32: 626 if (copy_from_user(time32, argp, sizeof(time32))) 627 return -EFAULT; 628 629 return pp_set_timeout(pp->pdev, time32[0], time32[1]); 630 631 case PPSETTIME64: 632 if (copy_from_user(time64, argp, sizeof(time64))) 633 return -EFAULT; 634 635 return pp_set_timeout(pp->pdev, time64[0], time64[1]); 636 637 case PPGETTIME32: 638 jiffies_to_timespec64(pp->pdev->timeout, &ts); 639 time32[0] = ts.tv_sec; 640 time32[1] = ts.tv_nsec / NSEC_PER_USEC; 641 if ((time32[0] < 0) || (time32[1] < 0)) 642 return -EINVAL; 643 644 if (copy_to_user(argp, time32, sizeof(time32))) 645 return -EFAULT; 646 647 return 0; 648 649 case PPGETTIME64: 650 jiffies_to_timespec64(pp->pdev->timeout, &ts); 651 time64[0] = ts.tv_sec; 652 time64[1] = ts.tv_nsec / NSEC_PER_USEC; 653 if ((time64[0] < 0) || (time64[1] < 0)) 654 return -EINVAL; 655 656 if (copy_to_user(argp, time64, sizeof(time64))) 657 return -EFAULT; 658 659 return 0; 660 661 default: 662 dev_dbg(&pp->pdev->dev, "What? (cmd=0x%x)\n", cmd); 663 return -EINVAL; 664 } 665 666 /* Keep the compiler happy */ 667 return 0; 668 } 669 670 static long pp_ioctl(struct file *file, unsigned int cmd, unsigned long arg) 671 { 672 long ret; 673 674 mutex_lock(&pp_do_mutex); 675 ret = pp_do_ioctl(file, cmd, arg); 676 mutex_unlock(&pp_do_mutex); 677 return ret; 678 } 679 680 #ifdef CONFIG_COMPAT 681 static long pp_compat_ioctl(struct file *file, unsigned int cmd, 682 unsigned long arg) 683 { 684 return pp_ioctl(file, cmd, (unsigned long)compat_ptr(arg)); 685 } 686 #endif 687 688 static int pp_open(struct inode *inode, struct file *file) 689 { 690 unsigned int minor = iminor(inode); 691 struct pp_struct *pp; 692 693 if (minor >= PARPORT_MAX) 694 return -ENXIO; 695 696 pp = kmalloc(sizeof(struct pp_struct), GFP_KERNEL); 697 if (!pp) 698 return -ENOMEM; 699 700 pp->state.mode = IEEE1284_MODE_COMPAT; 701 pp->state.phase = init_phase(pp->state.mode); 702 pp->flags = 0; 703 pp->irqresponse = 0; 704 atomic_set(&pp->irqc, 0); 705 init_waitqueue_head(&pp->irq_wait); 706 707 /* Defer the actual device registration until the first claim. 708 * That way, we know whether or not the driver wants to have 709 * exclusive access to the port (PPEXCL). 710 */ 711 pp->pdev = NULL; 712 file->private_data = pp; 713 714 return 0; 715 } 716 717 static int pp_release(struct inode *inode, struct file *file) 718 { 719 unsigned int minor = iminor(inode); 720 struct pp_struct *pp = file->private_data; 721 int compat_negot; 722 723 compat_negot = 0; 724 if (!(pp->flags & PP_CLAIMED) && pp->pdev && 725 (pp->state.mode != IEEE1284_MODE_COMPAT)) { 726 struct ieee1284_info *info; 727 728 /* parport released, but not in compatibility mode */ 729 parport_claim_or_block(pp->pdev); 730 pp->flags |= PP_CLAIMED; 731 info = &pp->pdev->port->ieee1284; 732 pp->saved_state.mode = info->mode; 733 pp->saved_state.phase = info->phase; 734 info->mode = pp->state.mode; 735 info->phase = pp->state.phase; 736 compat_negot = 1; 737 } else if ((pp->flags & PP_CLAIMED) && pp->pdev && 738 (pp->pdev->port->ieee1284.mode != IEEE1284_MODE_COMPAT)) { 739 compat_negot = 2; 740 } 741 if (compat_negot) { 742 parport_negotiate(pp->pdev->port, IEEE1284_MODE_COMPAT); 743 dev_dbg(&pp->pdev->dev, 744 "negotiated back to compatibility mode because user-space forgot\n"); 745 } 746 747 if (pp->flags & PP_CLAIMED) { 748 struct ieee1284_info *info; 749 750 info = &pp->pdev->port->ieee1284; 751 pp->state.mode = info->mode; 752 pp->state.phase = info->phase; 753 info->mode = pp->saved_state.mode; 754 info->phase = pp->saved_state.phase; 755 parport_release(pp->pdev); 756 if (compat_negot != 1) { 757 pr_debug(CHRDEV "%x: released pardevice " 758 "because user-space forgot\n", minor); 759 } 760 } 761 762 if (pp->pdev) { 763 parport_unregister_device(pp->pdev); 764 ida_simple_remove(&ida_index, pp->index); 765 pp->pdev = NULL; 766 pr_debug(CHRDEV "%x: unregistered pardevice\n", minor); 767 } 768 769 kfree(pp); 770 771 return 0; 772 } 773 774 /* No kernel lock held - fine */ 775 static unsigned int pp_poll(struct file *file, poll_table *wait) 776 { 777 struct pp_struct *pp = file->private_data; 778 unsigned int mask = 0; 779 780 poll_wait(file, &pp->irq_wait, wait); 781 if (atomic_read(&pp->irqc)) 782 mask |= POLLIN | POLLRDNORM; 783 784 return mask; 785 } 786 787 static struct class *ppdev_class; 788 789 static const struct file_operations pp_fops = { 790 .owner = THIS_MODULE, 791 .llseek = no_llseek, 792 .read = pp_read, 793 .write = pp_write, 794 .poll = pp_poll, 795 .unlocked_ioctl = pp_ioctl, 796 #ifdef CONFIG_COMPAT 797 .compat_ioctl = pp_compat_ioctl, 798 #endif 799 .open = pp_open, 800 .release = pp_release, 801 }; 802 803 static void pp_attach(struct parport *port) 804 { 805 struct device *ret; 806 807 if (devices[port->number]) 808 return; 809 810 ret = device_create(ppdev_class, port->dev, 811 MKDEV(PP_MAJOR, port->number), NULL, 812 "parport%d", port->number); 813 if (IS_ERR(ret)) { 814 pr_err("Failed to create device parport%d\n", 815 port->number); 816 return; 817 } 818 devices[port->number] = ret; 819 } 820 821 static void pp_detach(struct parport *port) 822 { 823 if (!devices[port->number]) 824 return; 825 826 device_destroy(ppdev_class, MKDEV(PP_MAJOR, port->number)); 827 devices[port->number] = NULL; 828 } 829 830 static int pp_probe(struct pardevice *par_dev) 831 { 832 struct device_driver *drv = par_dev->dev.driver; 833 int len = strlen(drv->name); 834 835 if (strncmp(par_dev->name, drv->name, len)) 836 return -ENODEV; 837 838 return 0; 839 } 840 841 static struct parport_driver pp_driver = { 842 .name = CHRDEV, 843 .probe = pp_probe, 844 .match_port = pp_attach, 845 .detach = pp_detach, 846 .devmodel = true, 847 }; 848 849 static int __init ppdev_init(void) 850 { 851 int err = 0; 852 853 if (register_chrdev(PP_MAJOR, CHRDEV, &pp_fops)) { 854 pr_warn(CHRDEV ": unable to get major %d\n", PP_MAJOR); 855 return -EIO; 856 } 857 ppdev_class = class_create(THIS_MODULE, CHRDEV); 858 if (IS_ERR(ppdev_class)) { 859 err = PTR_ERR(ppdev_class); 860 goto out_chrdev; 861 } 862 err = parport_register_driver(&pp_driver); 863 if (err < 0) { 864 pr_warn(CHRDEV ": unable to register with parport\n"); 865 goto out_class; 866 } 867 868 pr_info(PP_VERSION "\n"); 869 goto out; 870 871 out_class: 872 class_destroy(ppdev_class); 873 out_chrdev: 874 unregister_chrdev(PP_MAJOR, CHRDEV); 875 out: 876 return err; 877 } 878 879 static void __exit ppdev_cleanup(void) 880 { 881 /* Clean up all parport stuff */ 882 parport_unregister_driver(&pp_driver); 883 class_destroy(ppdev_class); 884 unregister_chrdev(PP_MAJOR, CHRDEV); 885 } 886 887 module_init(ppdev_init); 888 module_exit(ppdev_cleanup); 889 890 MODULE_LICENSE("GPL"); 891 MODULE_ALIAS_CHARDEV_MAJOR(PP_MAJOR); 892