comedi_fops.c revision 81604d43ade6abd316444f99ddb633f2e5a3f3eb
1/* 2 comedi/comedi_fops.c 3 comedi kernel module 4 5 COMEDI - Linux Control and Measurement Device Interface 6 Copyright (C) 1997-2000 David A. Schleef <ds@schleef.org> 7 8 This program is free software; you can redistribute it and/or modify 9 it under the terms of the GNU General Public License as published by 10 the Free Software Foundation; either version 2 of the License, or 11 (at your option) any later version. 12 13 This program is distributed in the hope that it will be useful, 14 but WITHOUT ANY WARRANTY; without even the implied warranty of 15 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the 16 GNU General Public License for more details. 17 18 You should have received a copy of the GNU General Public License 19 along with this program; if not, write to the Free Software 20 Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA. 21 22*/ 23 24#undef DEBUG 25 26#define __NO_VERSION__ 27#include "comedi_fops.h" 28#include "comedi_compat32.h" 29 30#include <linux/module.h> 31#include <linux/errno.h> 32#include <linux/kernel.h> 33#include <linux/sched.h> 34#include <linux/fcntl.h> 35#include <linux/delay.h> 36#include <linux/ioport.h> 37#include <linux/mm.h> 38#include <linux/slab.h> 39#include <linux/kmod.h> 40#include <linux/poll.h> 41#include <linux/init.h> 42#include <linux/device.h> 43#include <linux/vmalloc.h> 44#include <linux/fs.h> 45#include "comedidev.h" 46#include <linux/cdev.h> 47#include <linux/stat.h> 48 49#include <linux/io.h> 50#include <linux/uaccess.h> 51 52#include "internal.h" 53 54MODULE_AUTHOR("http://www.comedi.org"); 55MODULE_DESCRIPTION("Comedi core module"); 56MODULE_LICENSE("GPL"); 57 58#ifdef CONFIG_COMEDI_DEBUG 59int comedi_debug; 60EXPORT_SYMBOL(comedi_debug); 61module_param(comedi_debug, int, 0644); 62#endif 63 64int comedi_autoconfig = 1; 65module_param(comedi_autoconfig, bool, 0444); 66 67static int comedi_num_legacy_minors; 68module_param(comedi_num_legacy_minors, int, 0444); 69 70static DEFINE_SPINLOCK(comedi_file_info_table_lock); 71static struct comedi_device_file_info 72*comedi_file_info_table[COMEDI_NUM_MINORS]; 73 74static int do_devconfig_ioctl(struct comedi_device *dev, 75 struct comedi_devconfig __user *arg); 76static int do_bufconfig_ioctl(struct comedi_device *dev, 77 struct comedi_bufconfig __user *arg); 78static int do_devinfo_ioctl(struct comedi_device *dev, 79 struct comedi_devinfo __user *arg, 80 struct file *file); 81static int do_subdinfo_ioctl(struct comedi_device *dev, 82 struct comedi_subdinfo __user *arg, void *file); 83static int do_chaninfo_ioctl(struct comedi_device *dev, 84 struct comedi_chaninfo __user *arg); 85static int do_bufinfo_ioctl(struct comedi_device *dev, 86 struct comedi_bufinfo __user *arg, void *file); 87static int do_cmd_ioctl(struct comedi_device *dev, 88 struct comedi_cmd __user *arg, void *file); 89static int do_lock_ioctl(struct comedi_device *dev, unsigned int arg, 90 void *file); 91static int do_unlock_ioctl(struct comedi_device *dev, unsigned int arg, 92 void *file); 93static int do_cancel_ioctl(struct comedi_device *dev, unsigned int arg, 94 void *file); 95static int do_cmdtest_ioctl(struct comedi_device *dev, 96 struct comedi_cmd __user *arg, void *file); 97static int do_insnlist_ioctl(struct comedi_device *dev, 98 struct comedi_insnlist __user *arg, void *file); 99static int do_insn_ioctl(struct comedi_device *dev, 100 struct comedi_insn __user *arg, void *file); 101static int do_poll_ioctl(struct comedi_device *dev, unsigned int subd, 102 void *file); 103 104extern void do_become_nonbusy(struct comedi_device *dev, 105 struct comedi_subdevice *s); 106static int do_cancel(struct comedi_device *dev, struct comedi_subdevice *s); 107 108static int comedi_fasync(int fd, struct file *file, int on); 109 110static int is_device_busy(struct comedi_device *dev); 111static int resize_async_buffer(struct comedi_device *dev, 112 struct comedi_subdevice *s, 113 struct comedi_async *async, unsigned new_size); 114 115/* declarations for sysfs attribute files */ 116static struct device_attribute dev_attr_max_read_buffer_kb; 117static struct device_attribute dev_attr_read_buffer_kb; 118static struct device_attribute dev_attr_max_write_buffer_kb; 119static struct device_attribute dev_attr_write_buffer_kb; 120 121static long comedi_unlocked_ioctl(struct file *file, unsigned int cmd, 122 unsigned long arg) 123{ 124 const unsigned minor = iminor(file->f_dentry->d_inode); 125 struct comedi_device_file_info *dev_file_info = 126 comedi_get_device_file_info(minor); 127 struct comedi_device *dev; 128 int rc; 129 130 if (dev_file_info == NULL || dev_file_info->device == NULL) 131 return -ENODEV; 132 dev = dev_file_info->device; 133 134 mutex_lock(&dev->mutex); 135 136 /* Device config is special, because it must work on 137 * an unconfigured device. */ 138 if (cmd == COMEDI_DEVCONFIG) { 139 rc = do_devconfig_ioctl(dev, 140 (struct comedi_devconfig __user *)arg); 141 goto done; 142 } 143 144 if (!dev->attached) { 145 DPRINTK("no driver configured on /dev/comedi%i\n", dev->minor); 146 rc = -ENODEV; 147 goto done; 148 } 149 150 switch (cmd) { 151 case COMEDI_BUFCONFIG: 152 rc = do_bufconfig_ioctl(dev, 153 (struct comedi_bufconfig __user *)arg); 154 break; 155 case COMEDI_DEVINFO: 156 rc = do_devinfo_ioctl(dev, (struct comedi_devinfo __user *)arg, 157 file); 158 break; 159 case COMEDI_SUBDINFO: 160 rc = do_subdinfo_ioctl(dev, 161 (struct comedi_subdinfo __user *)arg, 162 file); 163 break; 164 case COMEDI_CHANINFO: 165 rc = do_chaninfo_ioctl(dev, (void __user *)arg); 166 break; 167 case COMEDI_RANGEINFO: 168 rc = do_rangeinfo_ioctl(dev, (void __user *)arg); 169 break; 170 case COMEDI_BUFINFO: 171 rc = do_bufinfo_ioctl(dev, 172 (struct comedi_bufinfo __user *)arg, 173 file); 174 break; 175 case COMEDI_LOCK: 176 rc = do_lock_ioctl(dev, arg, file); 177 break; 178 case COMEDI_UNLOCK: 179 rc = do_unlock_ioctl(dev, arg, file); 180 break; 181 case COMEDI_CANCEL: 182 rc = do_cancel_ioctl(dev, arg, file); 183 break; 184 case COMEDI_CMD: 185 rc = do_cmd_ioctl(dev, (struct comedi_cmd __user *)arg, file); 186 break; 187 case COMEDI_CMDTEST: 188 rc = do_cmdtest_ioctl(dev, (struct comedi_cmd __user *)arg, 189 file); 190 break; 191 case COMEDI_INSNLIST: 192 rc = do_insnlist_ioctl(dev, 193 (struct comedi_insnlist __user *)arg, 194 file); 195 break; 196 case COMEDI_INSN: 197 rc = do_insn_ioctl(dev, (struct comedi_insn __user *)arg, 198 file); 199 break; 200 case COMEDI_POLL: 201 rc = do_poll_ioctl(dev, arg, file); 202 break; 203 default: 204 rc = -ENOTTY; 205 break; 206 } 207 208done: 209 mutex_unlock(&dev->mutex); 210 return rc; 211} 212 213/* 214 COMEDI_DEVCONFIG 215 device config ioctl 216 217 arg: 218 pointer to devconfig structure 219 220 reads: 221 devconfig structure at arg 222 223 writes: 224 none 225*/ 226static int do_devconfig_ioctl(struct comedi_device *dev, 227 struct comedi_devconfig __user *arg) 228{ 229 struct comedi_devconfig it; 230 int ret; 231 unsigned char *aux_data = NULL; 232 int aux_len; 233 234 if (!capable(CAP_SYS_ADMIN)) 235 return -EPERM; 236 237 if (arg == NULL) { 238 if (is_device_busy(dev)) 239 return -EBUSY; 240 if (dev->attached) { 241 struct module *driver_module = dev->driver->module; 242 comedi_device_detach(dev); 243 module_put(driver_module); 244 } 245 return 0; 246 } 247 248 if (copy_from_user(&it, arg, sizeof(struct comedi_devconfig))) 249 return -EFAULT; 250 251 it.board_name[COMEDI_NAMELEN - 1] = 0; 252 253 if (comedi_aux_data(it.options, 0) && 254 it.options[COMEDI_DEVCONF_AUX_DATA_LENGTH]) { 255 int bit_shift; 256 aux_len = it.options[COMEDI_DEVCONF_AUX_DATA_LENGTH]; 257 if (aux_len < 0) 258 return -EFAULT; 259 260 aux_data = vmalloc(aux_len); 261 if (!aux_data) 262 return -ENOMEM; 263 264 if (copy_from_user(aux_data, 265 comedi_aux_data(it.options, 0), aux_len)) { 266 vfree(aux_data); 267 return -EFAULT; 268 } 269 it.options[COMEDI_DEVCONF_AUX_DATA_LO] = 270 (unsigned long)aux_data; 271 if (sizeof(void *) > sizeof(int)) { 272 bit_shift = sizeof(int) * 8; 273 it.options[COMEDI_DEVCONF_AUX_DATA_HI] = 274 ((unsigned long)aux_data) >> bit_shift; 275 } else 276 it.options[COMEDI_DEVCONF_AUX_DATA_HI] = 0; 277 } 278 279 ret = comedi_device_attach(dev, &it); 280 if (ret == 0) { 281 if (!try_module_get(dev->driver->module)) { 282 comedi_device_detach(dev); 283 return -ENOSYS; 284 } 285 } 286 287 if (aux_data) 288 vfree(aux_data); 289 290 return ret; 291} 292 293/* 294 COMEDI_BUFCONFIG 295 buffer configuration ioctl 296 297 arg: 298 pointer to bufconfig structure 299 300 reads: 301 bufconfig at arg 302 303 writes: 304 modified bufconfig at arg 305 306*/ 307static int do_bufconfig_ioctl(struct comedi_device *dev, 308 struct comedi_bufconfig __user *arg) 309{ 310 struct comedi_bufconfig bc; 311 struct comedi_async *async; 312 struct comedi_subdevice *s; 313 int retval = 0; 314 315 if (copy_from_user(&bc, arg, sizeof(struct comedi_bufconfig))) 316 return -EFAULT; 317 318 if (bc.subdevice >= dev->n_subdevices || bc.subdevice < 0) 319 return -EINVAL; 320 321 s = dev->subdevices + bc.subdevice; 322 async = s->async; 323 324 if (!async) { 325 DPRINTK("subdevice does not have async capability\n"); 326 bc.size = 0; 327 bc.maximum_size = 0; 328 goto copyback; 329 } 330 331 if (bc.maximum_size) { 332 if (!capable(CAP_SYS_ADMIN)) 333 return -EPERM; 334 335 async->max_bufsize = bc.maximum_size; 336 } 337 338 if (bc.size) { 339 retval = resize_async_buffer(dev, s, async, bc.size); 340 if (retval < 0) 341 return retval; 342 } 343 344 bc.size = async->prealloc_bufsz; 345 bc.maximum_size = async->max_bufsize; 346 347copyback: 348 if (copy_to_user(arg, &bc, sizeof(struct comedi_bufconfig))) 349 return -EFAULT; 350 351 return 0; 352} 353 354/* 355 COMEDI_DEVINFO 356 device info ioctl 357 358 arg: 359 pointer to devinfo structure 360 361 reads: 362 none 363 364 writes: 365 devinfo structure 366 367*/ 368static int do_devinfo_ioctl(struct comedi_device *dev, 369 struct comedi_devinfo __user *arg, 370 struct file *file) 371{ 372 struct comedi_devinfo devinfo; 373 const unsigned minor = iminor(file->f_dentry->d_inode); 374 struct comedi_device_file_info *dev_file_info = 375 comedi_get_device_file_info(minor); 376 struct comedi_subdevice *read_subdev = 377 comedi_get_read_subdevice(dev_file_info); 378 struct comedi_subdevice *write_subdev = 379 comedi_get_write_subdevice(dev_file_info); 380 381 memset(&devinfo, 0, sizeof(devinfo)); 382 383 /* fill devinfo structure */ 384 devinfo.version_code = COMEDI_VERSION_CODE; 385 devinfo.n_subdevs = dev->n_subdevices; 386 memcpy(devinfo.driver_name, dev->driver->driver_name, COMEDI_NAMELEN); 387 memcpy(devinfo.board_name, dev->board_name, COMEDI_NAMELEN); 388 389 if (read_subdev) 390 devinfo.read_subdevice = read_subdev - dev->subdevices; 391 else 392 devinfo.read_subdevice = -1; 393 394 if (write_subdev) 395 devinfo.write_subdevice = write_subdev - dev->subdevices; 396 else 397 devinfo.write_subdevice = -1; 398 399 if (copy_to_user(arg, &devinfo, sizeof(struct comedi_devinfo))) 400 return -EFAULT; 401 402 return 0; 403} 404 405/* 406 COMEDI_SUBDINFO 407 subdevice info ioctl 408 409 arg: 410 pointer to array of subdevice info structures 411 412 reads: 413 none 414 415 writes: 416 array of subdevice info structures at arg 417 418*/ 419static int do_subdinfo_ioctl(struct comedi_device *dev, 420 struct comedi_subdinfo __user *arg, void *file) 421{ 422 int ret, i; 423 struct comedi_subdinfo *tmp, *us; 424 struct comedi_subdevice *s; 425 426 tmp = 427 kcalloc(dev->n_subdevices, sizeof(struct comedi_subdinfo), 428 GFP_KERNEL); 429 if (!tmp) 430 return -ENOMEM; 431 432 /* fill subdinfo structs */ 433 for (i = 0; i < dev->n_subdevices; i++) { 434 s = dev->subdevices + i; 435 us = tmp + i; 436 437 us->type = s->type; 438 us->n_chan = s->n_chan; 439 us->subd_flags = s->subdev_flags; 440 if (comedi_get_subdevice_runflags(s) & SRF_RUNNING) 441 us->subd_flags |= SDF_RUNNING; 442#define TIMER_nanosec 5 /* backwards compatibility */ 443 us->timer_type = TIMER_nanosec; 444 us->len_chanlist = s->len_chanlist; 445 us->maxdata = s->maxdata; 446 if (s->range_table) { 447 us->range_type = 448 (i << 24) | (0 << 16) | (s->range_table->length); 449 } else { 450 us->range_type = 0; /* XXX */ 451 } 452 us->flags = s->flags; 453 454 if (s->busy) 455 us->subd_flags |= SDF_BUSY; 456 if (s->busy == file) 457 us->subd_flags |= SDF_BUSY_OWNER; 458 if (s->lock) 459 us->subd_flags |= SDF_LOCKED; 460 if (s->lock == file) 461 us->subd_flags |= SDF_LOCK_OWNER; 462 if (!s->maxdata && s->maxdata_list) 463 us->subd_flags |= SDF_MAXDATA; 464 if (s->flaglist) 465 us->subd_flags |= SDF_FLAGS; 466 if (s->range_table_list) 467 us->subd_flags |= SDF_RANGETYPE; 468 if (s->do_cmd) 469 us->subd_flags |= SDF_CMD; 470 471 if (s->insn_bits != &insn_inval) 472 us->insn_bits_support = COMEDI_SUPPORTED; 473 else 474 us->insn_bits_support = COMEDI_UNSUPPORTED; 475 476 us->settling_time_0 = s->settling_time_0; 477 } 478 479 ret = copy_to_user(arg, tmp, 480 dev->n_subdevices * sizeof(struct comedi_subdinfo)); 481 482 kfree(tmp); 483 484 return ret ? -EFAULT : 0; 485} 486 487/* 488 COMEDI_CHANINFO 489 subdevice info ioctl 490 491 arg: 492 pointer to chaninfo structure 493 494 reads: 495 chaninfo structure at arg 496 497 writes: 498 arrays at elements of chaninfo structure 499 500*/ 501static int do_chaninfo_ioctl(struct comedi_device *dev, 502 struct comedi_chaninfo __user *arg) 503{ 504 struct comedi_subdevice *s; 505 struct comedi_chaninfo it; 506 507 if (copy_from_user(&it, arg, sizeof(struct comedi_chaninfo))) 508 return -EFAULT; 509 510 if (it.subdev >= dev->n_subdevices) 511 return -EINVAL; 512 s = dev->subdevices + it.subdev; 513 514 if (it.maxdata_list) { 515 if (s->maxdata || !s->maxdata_list) 516 return -EINVAL; 517 if (copy_to_user(it.maxdata_list, s->maxdata_list, 518 s->n_chan * sizeof(unsigned int))) 519 return -EFAULT; 520 } 521 522 if (it.flaglist) { 523 if (!s->flaglist) 524 return -EINVAL; 525 if (copy_to_user(it.flaglist, s->flaglist, 526 s->n_chan * sizeof(unsigned int))) 527 return -EFAULT; 528 } 529 530 if (it.rangelist) { 531 int i; 532 533 if (!s->range_table_list) 534 return -EINVAL; 535 for (i = 0; i < s->n_chan; i++) { 536 int x; 537 538 x = (dev->minor << 28) | (it.subdev << 24) | (i << 16) | 539 (s->range_table_list[i]->length); 540 if (put_user(x, it.rangelist + i)) 541 return -EFAULT; 542 } 543#if 0 544 if (copy_to_user(it.rangelist, s->range_type_list, 545 s->n_chan * sizeof(unsigned int))) 546 return -EFAULT; 547#endif 548 } 549 550 return 0; 551} 552 553 /* 554 COMEDI_BUFINFO 555 buffer information ioctl 556 557 arg: 558 pointer to bufinfo structure 559 560 reads: 561 bufinfo at arg 562 563 writes: 564 modified bufinfo at arg 565 566 */ 567static int do_bufinfo_ioctl(struct comedi_device *dev, 568 struct comedi_bufinfo __user *arg, void *file) 569{ 570 struct comedi_bufinfo bi; 571 struct comedi_subdevice *s; 572 struct comedi_async *async; 573 574 if (copy_from_user(&bi, arg, sizeof(struct comedi_bufinfo))) 575 return -EFAULT; 576 577 if (bi.subdevice >= dev->n_subdevices || bi.subdevice < 0) 578 return -EINVAL; 579 580 s = dev->subdevices + bi.subdevice; 581 582 if (s->lock && s->lock != file) 583 return -EACCES; 584 585 async = s->async; 586 587 if (!async) { 588 DPRINTK("subdevice does not have async capability\n"); 589 bi.buf_write_ptr = 0; 590 bi.buf_read_ptr = 0; 591 bi.buf_write_count = 0; 592 bi.buf_read_count = 0; 593 bi.bytes_read = 0; 594 bi.bytes_written = 0; 595 goto copyback; 596 } 597 if (!s->busy) { 598 bi.bytes_read = 0; 599 bi.bytes_written = 0; 600 goto copyback_position; 601 } 602 if (s->busy != file) 603 return -EACCES; 604 605 if (bi.bytes_read && (s->subdev_flags & SDF_CMD_READ)) { 606 bi.bytes_read = comedi_buf_read_alloc(async, bi.bytes_read); 607 comedi_buf_read_free(async, bi.bytes_read); 608 609 if (!(comedi_get_subdevice_runflags(s) & (SRF_ERROR | 610 SRF_RUNNING)) 611 && async->buf_write_count == async->buf_read_count) { 612 do_become_nonbusy(dev, s); 613 } 614 } 615 616 if (bi.bytes_written && (s->subdev_flags & SDF_CMD_WRITE)) { 617 bi.bytes_written = 618 comedi_buf_write_alloc(async, bi.bytes_written); 619 comedi_buf_write_free(async, bi.bytes_written); 620 } 621 622copyback_position: 623 bi.buf_write_count = async->buf_write_count; 624 bi.buf_write_ptr = async->buf_write_ptr; 625 bi.buf_read_count = async->buf_read_count; 626 bi.buf_read_ptr = async->buf_read_ptr; 627 628copyback: 629 if (copy_to_user(arg, &bi, sizeof(struct comedi_bufinfo))) 630 return -EFAULT; 631 632 return 0; 633} 634 635static int parse_insn(struct comedi_device *dev, struct comedi_insn *insn, 636 unsigned int *data, void *file); 637/* 638 * COMEDI_INSNLIST 639 * synchronous instructions 640 * 641 * arg: 642 * pointer to sync cmd structure 643 * 644 * reads: 645 * sync cmd struct at arg 646 * instruction list 647 * data (for writes) 648 * 649 * writes: 650 * data (for reads) 651 */ 652/* arbitrary limits */ 653#define MAX_SAMPLES 256 654static int do_insnlist_ioctl(struct comedi_device *dev, 655 struct comedi_insnlist __user *arg, void *file) 656{ 657 struct comedi_insnlist insnlist; 658 struct comedi_insn *insns = NULL; 659 unsigned int *data = NULL; 660 int i = 0; 661 int ret = 0; 662 663 if (copy_from_user(&insnlist, arg, sizeof(struct comedi_insnlist))) 664 return -EFAULT; 665 666 data = kmalloc(sizeof(unsigned int) * MAX_SAMPLES, GFP_KERNEL); 667 if (!data) { 668 DPRINTK("kmalloc failed\n"); 669 ret = -ENOMEM; 670 goto error; 671 } 672 673 insns = 674 kmalloc(sizeof(struct comedi_insn) * insnlist.n_insns, GFP_KERNEL); 675 if (!insns) { 676 DPRINTK("kmalloc failed\n"); 677 ret = -ENOMEM; 678 goto error; 679 } 680 681 if (copy_from_user(insns, insnlist.insns, 682 sizeof(struct comedi_insn) * insnlist.n_insns)) { 683 DPRINTK("copy_from_user failed\n"); 684 ret = -EFAULT; 685 goto error; 686 } 687 688 for (i = 0; i < insnlist.n_insns; i++) { 689 if (insns[i].n > MAX_SAMPLES) { 690 DPRINTK("number of samples too large\n"); 691 ret = -EINVAL; 692 goto error; 693 } 694 if (insns[i].insn & INSN_MASK_WRITE) { 695 if (copy_from_user(data, insns[i].data, 696 insns[i].n * sizeof(unsigned int))) { 697 DPRINTK("copy_from_user failed\n"); 698 ret = -EFAULT; 699 goto error; 700 } 701 } 702 ret = parse_insn(dev, insns + i, data, file); 703 if (ret < 0) 704 goto error; 705 if (insns[i].insn & INSN_MASK_READ) { 706 if (copy_to_user(insns[i].data, data, 707 insns[i].n * sizeof(unsigned int))) { 708 DPRINTK("copy_to_user failed\n"); 709 ret = -EFAULT; 710 goto error; 711 } 712 } 713 if (need_resched()) 714 schedule(); 715 } 716 717error: 718 kfree(insns); 719 kfree(data); 720 721 if (ret < 0) 722 return ret; 723 return i; 724} 725 726static int check_insn_config_length(struct comedi_insn *insn, 727 unsigned int *data) 728{ 729 if (insn->n < 1) 730 return -EINVAL; 731 732 switch (data[0]) { 733 case INSN_CONFIG_DIO_OUTPUT: 734 case INSN_CONFIG_DIO_INPUT: 735 case INSN_CONFIG_DISARM: 736 case INSN_CONFIG_RESET: 737 if (insn->n == 1) 738 return 0; 739 break; 740 case INSN_CONFIG_ARM: 741 case INSN_CONFIG_DIO_QUERY: 742 case INSN_CONFIG_BLOCK_SIZE: 743 case INSN_CONFIG_FILTER: 744 case INSN_CONFIG_SERIAL_CLOCK: 745 case INSN_CONFIG_BIDIRECTIONAL_DATA: 746 case INSN_CONFIG_ALT_SOURCE: 747 case INSN_CONFIG_SET_COUNTER_MODE: 748 case INSN_CONFIG_8254_READ_STATUS: 749 case INSN_CONFIG_SET_ROUTING: 750 case INSN_CONFIG_GET_ROUTING: 751 case INSN_CONFIG_GET_PWM_STATUS: 752 case INSN_CONFIG_PWM_SET_PERIOD: 753 case INSN_CONFIG_PWM_GET_PERIOD: 754 if (insn->n == 2) 755 return 0; 756 break; 757 case INSN_CONFIG_SET_GATE_SRC: 758 case INSN_CONFIG_GET_GATE_SRC: 759 case INSN_CONFIG_SET_CLOCK_SRC: 760 case INSN_CONFIG_GET_CLOCK_SRC: 761 case INSN_CONFIG_SET_OTHER_SRC: 762 case INSN_CONFIG_GET_COUNTER_STATUS: 763 case INSN_CONFIG_PWM_SET_H_BRIDGE: 764 case INSN_CONFIG_PWM_GET_H_BRIDGE: 765 case INSN_CONFIG_GET_HARDWARE_BUFFER_SIZE: 766 if (insn->n == 3) 767 return 0; 768 break; 769 case INSN_CONFIG_PWM_OUTPUT: 770 case INSN_CONFIG_ANALOG_TRIG: 771 if (insn->n == 5) 772 return 0; 773 break; 774 /* by default we allow the insn since we don't have checks for 775 * all possible cases yet */ 776 default: 777 printk(KERN_WARNING 778 "comedi: no check for data length of config insn id " 779 "%i is implemented.\n" 780 " Add a check to %s in %s.\n" 781 " Assuming n=%i is correct.\n", data[0], __func__, 782 __FILE__, insn->n); 783 return 0; 784 break; 785 } 786 return -EINVAL; 787} 788 789static int parse_insn(struct comedi_device *dev, struct comedi_insn *insn, 790 unsigned int *data, void *file) 791{ 792 struct comedi_subdevice *s; 793 int ret = 0; 794 int i; 795 796 if (insn->insn & INSN_MASK_SPECIAL) { 797 /* a non-subdevice instruction */ 798 799 switch (insn->insn) { 800 case INSN_GTOD: 801 { 802 struct timeval tv; 803 804 if (insn->n != 2) { 805 ret = -EINVAL; 806 break; 807 } 808 809 do_gettimeofday(&tv); 810 data[0] = tv.tv_sec; 811 data[1] = tv.tv_usec; 812 ret = 2; 813 814 break; 815 } 816 case INSN_WAIT: 817 if (insn->n != 1 || data[0] >= 100000) { 818 ret = -EINVAL; 819 break; 820 } 821 udelay(data[0] / 1000); 822 ret = 1; 823 break; 824 case INSN_INTTRIG: 825 if (insn->n != 1) { 826 ret = -EINVAL; 827 break; 828 } 829 if (insn->subdev >= dev->n_subdevices) { 830 DPRINTK("%d not usable subdevice\n", 831 insn->subdev); 832 ret = -EINVAL; 833 break; 834 } 835 s = dev->subdevices + insn->subdev; 836 if (!s->async) { 837 DPRINTK("no async\n"); 838 ret = -EINVAL; 839 break; 840 } 841 if (!s->async->inttrig) { 842 DPRINTK("no inttrig\n"); 843 ret = -EAGAIN; 844 break; 845 } 846 ret = s->async->inttrig(dev, s, insn->data[0]); 847 if (ret >= 0) 848 ret = 1; 849 break; 850 default: 851 DPRINTK("invalid insn\n"); 852 ret = -EINVAL; 853 break; 854 } 855 } else { 856 /* a subdevice instruction */ 857 unsigned int maxdata; 858 859 if (insn->subdev >= dev->n_subdevices) { 860 DPRINTK("subdevice %d out of range\n", insn->subdev); 861 ret = -EINVAL; 862 goto out; 863 } 864 s = dev->subdevices + insn->subdev; 865 866 if (s->type == COMEDI_SUBD_UNUSED) { 867 DPRINTK("%d not usable subdevice\n", insn->subdev); 868 ret = -EIO; 869 goto out; 870 } 871 872 /* are we locked? (ioctl lock) */ 873 if (s->lock && s->lock != file) { 874 DPRINTK("device locked\n"); 875 ret = -EACCES; 876 goto out; 877 } 878 879 ret = comedi_check_chanlist(s, 1, &insn->chanspec); 880 if (ret < 0) { 881 ret = -EINVAL; 882 DPRINTK("bad chanspec\n"); 883 goto out; 884 } 885 886 if (s->busy) { 887 ret = -EBUSY; 888 goto out; 889 } 890 /* This looks arbitrary. It is. */ 891 s->busy = &parse_insn; 892 switch (insn->insn) { 893 case INSN_READ: 894 ret = s->insn_read(dev, s, insn, data); 895 break; 896 case INSN_WRITE: 897 maxdata = s->maxdata_list 898 ? s->maxdata_list[CR_CHAN(insn->chanspec)] 899 : s->maxdata; 900 for (i = 0; i < insn->n; ++i) { 901 if (data[i] > maxdata) { 902 ret = -EINVAL; 903 DPRINTK("bad data value(s)\n"); 904 break; 905 } 906 } 907 if (ret == 0) 908 ret = s->insn_write(dev, s, insn, data); 909 break; 910 case INSN_BITS: 911 if (insn->n != 2) { 912 ret = -EINVAL; 913 break; 914 } 915 ret = s->insn_bits(dev, s, insn, data); 916 break; 917 case INSN_CONFIG: 918 ret = check_insn_config_length(insn, data); 919 if (ret) 920 break; 921 ret = s->insn_config(dev, s, insn, data); 922 break; 923 default: 924 ret = -EINVAL; 925 break; 926 } 927 928 s->busy = NULL; 929 } 930 931out: 932 return ret; 933} 934 935/* 936 * COMEDI_INSN 937 * synchronous instructions 938 * 939 * arg: 940 * pointer to insn 941 * 942 * reads: 943 * struct comedi_insn struct at arg 944 * data (for writes) 945 * 946 * writes: 947 * data (for reads) 948 */ 949static int do_insn_ioctl(struct comedi_device *dev, 950 struct comedi_insn __user *arg, void *file) 951{ 952 struct comedi_insn insn; 953 unsigned int *data = NULL; 954 int ret = 0; 955 956 data = kmalloc(sizeof(unsigned int) * MAX_SAMPLES, GFP_KERNEL); 957 if (!data) { 958 ret = -ENOMEM; 959 goto error; 960 } 961 962 if (copy_from_user(&insn, arg, sizeof(struct comedi_insn))) { 963 ret = -EFAULT; 964 goto error; 965 } 966 967 /* This is where the behavior of insn and insnlist deviate. */ 968 if (insn.n > MAX_SAMPLES) 969 insn.n = MAX_SAMPLES; 970 if (insn.insn & INSN_MASK_WRITE) { 971 if (copy_from_user(data, 972 insn.data, 973 insn.n * sizeof(unsigned int))) { 974 ret = -EFAULT; 975 goto error; 976 } 977 } 978 ret = parse_insn(dev, &insn, data, file); 979 if (ret < 0) 980 goto error; 981 if (insn.insn & INSN_MASK_READ) { 982 if (copy_to_user(insn.data, 983 data, 984 insn.n * sizeof(unsigned int))) { 985 ret = -EFAULT; 986 goto error; 987 } 988 } 989 ret = insn.n; 990 991error: 992 kfree(data); 993 994 return ret; 995} 996 997static void comedi_set_subdevice_runflags(struct comedi_subdevice *s, 998 unsigned mask, unsigned bits) 999{ 1000 unsigned long flags; 1001 1002 spin_lock_irqsave(&s->spin_lock, flags); 1003 s->runflags &= ~mask; 1004 s->runflags |= (bits & mask); 1005 spin_unlock_irqrestore(&s->spin_lock, flags); 1006} 1007 1008static int do_cmd_ioctl(struct comedi_device *dev, 1009 struct comedi_cmd __user *cmd, void *file) 1010{ 1011 struct comedi_cmd user_cmd; 1012 struct comedi_subdevice *s; 1013 struct comedi_async *async; 1014 int ret = 0; 1015 unsigned int __user *chanlist_saver = NULL; 1016 1017 if (copy_from_user(&user_cmd, cmd, sizeof(struct comedi_cmd))) { 1018 DPRINTK("bad cmd address\n"); 1019 return -EFAULT; 1020 } 1021 /* save user's chanlist pointer so it can be restored later */ 1022 chanlist_saver = user_cmd.chanlist; 1023 1024 if (user_cmd.subdev >= dev->n_subdevices) { 1025 DPRINTK("%d no such subdevice\n", user_cmd.subdev); 1026 return -ENODEV; 1027 } 1028 1029 s = dev->subdevices + user_cmd.subdev; 1030 async = s->async; 1031 1032 if (s->type == COMEDI_SUBD_UNUSED) { 1033 DPRINTK("%d not valid subdevice\n", user_cmd.subdev); 1034 return -EIO; 1035 } 1036 1037 if (!s->do_cmd || !s->do_cmdtest || !s->async) { 1038 DPRINTK("subdevice %i does not support commands\n", 1039 user_cmd.subdev); 1040 return -EIO; 1041 } 1042 1043 /* are we locked? (ioctl lock) */ 1044 if (s->lock && s->lock != file) { 1045 DPRINTK("subdevice locked\n"); 1046 return -EACCES; 1047 } 1048 1049 /* are we busy? */ 1050 if (s->busy) { 1051 DPRINTK("subdevice busy\n"); 1052 return -EBUSY; 1053 } 1054 s->busy = file; 1055 1056 /* make sure channel/gain list isn't too long */ 1057 if (user_cmd.chanlist_len > s->len_chanlist) { 1058 DPRINTK("channel/gain list too long %u > %d\n", 1059 user_cmd.chanlist_len, s->len_chanlist); 1060 ret = -EINVAL; 1061 goto cleanup; 1062 } 1063 1064 /* make sure channel/gain list isn't too short */ 1065 if (user_cmd.chanlist_len < 1) { 1066 DPRINTK("channel/gain list too short %u < 1\n", 1067 user_cmd.chanlist_len); 1068 ret = -EINVAL; 1069 goto cleanup; 1070 } 1071 1072 kfree(async->cmd.chanlist); 1073 async->cmd = user_cmd; 1074 async->cmd.data = NULL; 1075 /* load channel/gain list */ 1076 async->cmd.chanlist = 1077 kmalloc(async->cmd.chanlist_len * sizeof(int), GFP_KERNEL); 1078 if (!async->cmd.chanlist) { 1079 DPRINTK("allocation failed\n"); 1080 ret = -ENOMEM; 1081 goto cleanup; 1082 } 1083 1084 if (copy_from_user(async->cmd.chanlist, user_cmd.chanlist, 1085 async->cmd.chanlist_len * sizeof(int))) { 1086 DPRINTK("fault reading chanlist\n"); 1087 ret = -EFAULT; 1088 goto cleanup; 1089 } 1090 1091 /* make sure each element in channel/gain list is valid */ 1092 ret = comedi_check_chanlist(s, 1093 async->cmd.chanlist_len, 1094 async->cmd.chanlist); 1095 if (ret < 0) { 1096 DPRINTK("bad chanlist\n"); 1097 goto cleanup; 1098 } 1099 1100 ret = s->do_cmdtest(dev, s, &async->cmd); 1101 1102 if (async->cmd.flags & TRIG_BOGUS || ret) { 1103 DPRINTK("test returned %d\n", ret); 1104 user_cmd = async->cmd; 1105 /* restore chanlist pointer before copying back */ 1106 user_cmd.chanlist = chanlist_saver; 1107 user_cmd.data = NULL; 1108 if (copy_to_user(cmd, &user_cmd, sizeof(struct comedi_cmd))) { 1109 DPRINTK("fault writing cmd\n"); 1110 ret = -EFAULT; 1111 goto cleanup; 1112 } 1113 ret = -EAGAIN; 1114 goto cleanup; 1115 } 1116 1117 if (!async->prealloc_bufsz) { 1118 ret = -ENOMEM; 1119 DPRINTK("no buffer (?)\n"); 1120 goto cleanup; 1121 } 1122 1123 comedi_reset_async_buf(async); 1124 1125 async->cb_mask = 1126 COMEDI_CB_EOA | COMEDI_CB_BLOCK | COMEDI_CB_ERROR | 1127 COMEDI_CB_OVERFLOW; 1128 if (async->cmd.flags & TRIG_WAKE_EOS) 1129 async->cb_mask |= COMEDI_CB_EOS; 1130 1131 comedi_set_subdevice_runflags(s, ~0, SRF_USER | SRF_RUNNING); 1132 1133 ret = s->do_cmd(dev, s); 1134 if (ret == 0) 1135 return 0; 1136 1137cleanup: 1138 do_become_nonbusy(dev, s); 1139 1140 return ret; 1141} 1142 1143/* 1144 COMEDI_CMDTEST 1145 command testing ioctl 1146 1147 arg: 1148 pointer to cmd structure 1149 1150 reads: 1151 cmd structure at arg 1152 channel/range list 1153 1154 writes: 1155 modified cmd structure at arg 1156 1157*/ 1158static int do_cmdtest_ioctl(struct comedi_device *dev, 1159 struct comedi_cmd __user *arg, void *file) 1160{ 1161 struct comedi_cmd user_cmd; 1162 struct comedi_subdevice *s; 1163 int ret = 0; 1164 unsigned int *chanlist = NULL; 1165 unsigned int __user *chanlist_saver = NULL; 1166 1167 if (copy_from_user(&user_cmd, arg, sizeof(struct comedi_cmd))) { 1168 DPRINTK("bad cmd address\n"); 1169 return -EFAULT; 1170 } 1171 /* save user's chanlist pointer so it can be restored later */ 1172 chanlist_saver = user_cmd.chanlist; 1173 1174 if (user_cmd.subdev >= dev->n_subdevices) { 1175 DPRINTK("%d no such subdevice\n", user_cmd.subdev); 1176 return -ENODEV; 1177 } 1178 1179 s = dev->subdevices + user_cmd.subdev; 1180 if (s->type == COMEDI_SUBD_UNUSED) { 1181 DPRINTK("%d not valid subdevice\n", user_cmd.subdev); 1182 return -EIO; 1183 } 1184 1185 if (!s->do_cmd || !s->do_cmdtest) { 1186 DPRINTK("subdevice %i does not support commands\n", 1187 user_cmd.subdev); 1188 return -EIO; 1189 } 1190 1191 /* make sure channel/gain list isn't too long */ 1192 if (user_cmd.chanlist_len > s->len_chanlist) { 1193 DPRINTK("channel/gain list too long %d > %d\n", 1194 user_cmd.chanlist_len, s->len_chanlist); 1195 ret = -EINVAL; 1196 goto cleanup; 1197 } 1198 1199 /* load channel/gain list */ 1200 if (user_cmd.chanlist) { 1201 chanlist = 1202 kmalloc(user_cmd.chanlist_len * sizeof(int), GFP_KERNEL); 1203 if (!chanlist) { 1204 DPRINTK("allocation failed\n"); 1205 ret = -ENOMEM; 1206 goto cleanup; 1207 } 1208 1209 if (copy_from_user(chanlist, user_cmd.chanlist, 1210 user_cmd.chanlist_len * sizeof(int))) { 1211 DPRINTK("fault reading chanlist\n"); 1212 ret = -EFAULT; 1213 goto cleanup; 1214 } 1215 1216 /* make sure each element in channel/gain list is valid */ 1217 ret = comedi_check_chanlist(s, user_cmd.chanlist_len, chanlist); 1218 if (ret < 0) { 1219 DPRINTK("bad chanlist\n"); 1220 goto cleanup; 1221 } 1222 1223 user_cmd.chanlist = chanlist; 1224 } 1225 1226 ret = s->do_cmdtest(dev, s, &user_cmd); 1227 1228 /* restore chanlist pointer before copying back */ 1229 user_cmd.chanlist = chanlist_saver; 1230 1231 if (copy_to_user(arg, &user_cmd, sizeof(struct comedi_cmd))) { 1232 DPRINTK("bad cmd address\n"); 1233 ret = -EFAULT; 1234 goto cleanup; 1235 } 1236cleanup: 1237 kfree(chanlist); 1238 1239 return ret; 1240} 1241 1242/* 1243 COMEDI_LOCK 1244 lock subdevice 1245 1246 arg: 1247 subdevice number 1248 1249 reads: 1250 none 1251 1252 writes: 1253 none 1254 1255*/ 1256 1257static int do_lock_ioctl(struct comedi_device *dev, unsigned int arg, 1258 void *file) 1259{ 1260 int ret = 0; 1261 unsigned long flags; 1262 struct comedi_subdevice *s; 1263 1264 if (arg >= dev->n_subdevices) 1265 return -EINVAL; 1266 s = dev->subdevices + arg; 1267 1268 spin_lock_irqsave(&s->spin_lock, flags); 1269 if (s->busy || s->lock) 1270 ret = -EBUSY; 1271 else 1272 s->lock = file; 1273 spin_unlock_irqrestore(&s->spin_lock, flags); 1274 1275 if (ret < 0) 1276 return ret; 1277 1278#if 0 1279 if (s->lock_f) 1280 ret = s->lock_f(dev, s); 1281#endif 1282 1283 return ret; 1284} 1285 1286/* 1287 COMEDI_UNLOCK 1288 unlock subdevice 1289 1290 arg: 1291 subdevice number 1292 1293 reads: 1294 none 1295 1296 writes: 1297 none 1298 1299 This function isn't protected by the semaphore, since 1300 we already own the lock. 1301*/ 1302static int do_unlock_ioctl(struct comedi_device *dev, unsigned int arg, 1303 void *file) 1304{ 1305 struct comedi_subdevice *s; 1306 1307 if (arg >= dev->n_subdevices) 1308 return -EINVAL; 1309 s = dev->subdevices + arg; 1310 1311 if (s->busy) 1312 return -EBUSY; 1313 1314 if (s->lock && s->lock != file) 1315 return -EACCES; 1316 1317 if (s->lock == file) { 1318#if 0 1319 if (s->unlock) 1320 s->unlock(dev, s); 1321#endif 1322 1323 s->lock = NULL; 1324 } 1325 1326 return 0; 1327} 1328 1329/* 1330 COMEDI_CANCEL 1331 cancel acquisition ioctl 1332 1333 arg: 1334 subdevice number 1335 1336 reads: 1337 nothing 1338 1339 writes: 1340 nothing 1341 1342*/ 1343static int do_cancel_ioctl(struct comedi_device *dev, unsigned int arg, 1344 void *file) 1345{ 1346 struct comedi_subdevice *s; 1347 1348 if (arg >= dev->n_subdevices) 1349 return -EINVAL; 1350 s = dev->subdevices + arg; 1351 if (s->async == NULL) 1352 return -EINVAL; 1353 1354 if (s->lock && s->lock != file) 1355 return -EACCES; 1356 1357 if (!s->busy) 1358 return 0; 1359 1360 if (s->busy != file) 1361 return -EBUSY; 1362 1363 return do_cancel(dev, s); 1364} 1365 1366/* 1367 COMEDI_POLL ioctl 1368 instructs driver to synchronize buffers 1369 1370 arg: 1371 subdevice number 1372 1373 reads: 1374 nothing 1375 1376 writes: 1377 nothing 1378 1379*/ 1380static int do_poll_ioctl(struct comedi_device *dev, unsigned int arg, 1381 void *file) 1382{ 1383 struct comedi_subdevice *s; 1384 1385 if (arg >= dev->n_subdevices) 1386 return -EINVAL; 1387 s = dev->subdevices + arg; 1388 1389 if (s->lock && s->lock != file) 1390 return -EACCES; 1391 1392 if (!s->busy) 1393 return 0; 1394 1395 if (s->busy != file) 1396 return -EBUSY; 1397 1398 if (s->poll) 1399 return s->poll(dev, s); 1400 1401 return -EINVAL; 1402} 1403 1404static int do_cancel(struct comedi_device *dev, struct comedi_subdevice *s) 1405{ 1406 int ret = 0; 1407 1408 if ((comedi_get_subdevice_runflags(s) & SRF_RUNNING) && s->cancel) 1409 ret = s->cancel(dev, s); 1410 1411 do_become_nonbusy(dev, s); 1412 1413 return ret; 1414} 1415 1416static void comedi_unmap(struct vm_area_struct *area) 1417{ 1418 struct comedi_async *async; 1419 struct comedi_device *dev; 1420 1421 async = area->vm_private_data; 1422 dev = async->subdevice->device; 1423 1424 mutex_lock(&dev->mutex); 1425 async->mmap_count--; 1426 mutex_unlock(&dev->mutex); 1427} 1428 1429static struct vm_operations_struct comedi_vm_ops = { 1430 .close = comedi_unmap, 1431}; 1432 1433static int comedi_mmap(struct file *file, struct vm_area_struct *vma) 1434{ 1435 const unsigned minor = iminor(file->f_dentry->d_inode); 1436 struct comedi_device_file_info *dev_file_info = 1437 comedi_get_device_file_info(minor); 1438 struct comedi_device *dev = dev_file_info->device; 1439 struct comedi_async *async = NULL; 1440 unsigned long start = vma->vm_start; 1441 unsigned long size; 1442 int n_pages; 1443 int i; 1444 int retval; 1445 struct comedi_subdevice *s; 1446 1447 mutex_lock(&dev->mutex); 1448 if (!dev->attached) { 1449 DPRINTK("no driver configured on comedi%i\n", dev->minor); 1450 retval = -ENODEV; 1451 goto done; 1452 } 1453 if (vma->vm_flags & VM_WRITE) 1454 s = comedi_get_write_subdevice(dev_file_info); 1455 else 1456 s = comedi_get_read_subdevice(dev_file_info); 1457 1458 if (s == NULL) { 1459 retval = -EINVAL; 1460 goto done; 1461 } 1462 async = s->async; 1463 if (async == NULL) { 1464 retval = -EINVAL; 1465 goto done; 1466 } 1467 1468 if (vma->vm_pgoff != 0) { 1469 DPRINTK("comedi: mmap() offset must be 0.\n"); 1470 retval = -EINVAL; 1471 goto done; 1472 } 1473 1474 size = vma->vm_end - vma->vm_start; 1475 if (size > async->prealloc_bufsz) { 1476 retval = -EFAULT; 1477 goto done; 1478 } 1479 if (size & (~PAGE_MASK)) { 1480 retval = -EFAULT; 1481 goto done; 1482 } 1483 1484 n_pages = size >> PAGE_SHIFT; 1485 for (i = 0; i < n_pages; ++i) { 1486 if (remap_pfn_range(vma, start, 1487 page_to_pfn(virt_to_page 1488 (async->buf_page_list 1489 [i].virt_addr)), PAGE_SIZE, 1490 PAGE_SHARED)) { 1491 retval = -EAGAIN; 1492 goto done; 1493 } 1494 start += PAGE_SIZE; 1495 } 1496 1497 vma->vm_ops = &comedi_vm_ops; 1498 vma->vm_private_data = async; 1499 1500 async->mmap_count++; 1501 1502 retval = 0; 1503done: 1504 mutex_unlock(&dev->mutex); 1505 return retval; 1506} 1507 1508static unsigned int comedi_poll(struct file *file, poll_table * wait) 1509{ 1510 unsigned int mask = 0; 1511 const unsigned minor = iminor(file->f_dentry->d_inode); 1512 struct comedi_device_file_info *dev_file_info = 1513 comedi_get_device_file_info(minor); 1514 struct comedi_device *dev = dev_file_info->device; 1515 struct comedi_subdevice *read_subdev; 1516 struct comedi_subdevice *write_subdev; 1517 1518 mutex_lock(&dev->mutex); 1519 if (!dev->attached) { 1520 DPRINTK("no driver configured on comedi%i\n", dev->minor); 1521 mutex_unlock(&dev->mutex); 1522 return 0; 1523 } 1524 1525 mask = 0; 1526 read_subdev = comedi_get_read_subdevice(dev_file_info); 1527 if (read_subdev) { 1528 poll_wait(file, &read_subdev->async->wait_head, wait); 1529 if (!read_subdev->busy 1530 || comedi_buf_read_n_available(read_subdev->async) > 0 1531 || !(comedi_get_subdevice_runflags(read_subdev) & 1532 SRF_RUNNING)) { 1533 mask |= POLLIN | POLLRDNORM; 1534 } 1535 } 1536 write_subdev = comedi_get_write_subdevice(dev_file_info); 1537 if (write_subdev) { 1538 poll_wait(file, &write_subdev->async->wait_head, wait); 1539 comedi_buf_write_alloc(write_subdev->async, 1540 write_subdev->async->prealloc_bufsz); 1541 if (!write_subdev->busy 1542 || !(comedi_get_subdevice_runflags(write_subdev) & 1543 SRF_RUNNING) 1544 || comedi_buf_write_n_allocated(write_subdev->async) >= 1545 bytes_per_sample(write_subdev->async->subdevice)) { 1546 mask |= POLLOUT | POLLWRNORM; 1547 } 1548 } 1549 1550 mutex_unlock(&dev->mutex); 1551 return mask; 1552} 1553 1554static ssize_t comedi_write(struct file *file, const char __user *buf, 1555 size_t nbytes, loff_t *offset) 1556{ 1557 struct comedi_subdevice *s; 1558 struct comedi_async *async; 1559 int n, m, count = 0, retval = 0; 1560 DECLARE_WAITQUEUE(wait, current); 1561 const unsigned minor = iminor(file->f_dentry->d_inode); 1562 struct comedi_device_file_info *dev_file_info = 1563 comedi_get_device_file_info(minor); 1564 struct comedi_device *dev = dev_file_info->device; 1565 1566 if (!dev->attached) { 1567 DPRINTK("no driver configured on comedi%i\n", dev->minor); 1568 retval = -ENODEV; 1569 goto done; 1570 } 1571 1572 s = comedi_get_write_subdevice(dev_file_info); 1573 if (s == NULL) { 1574 retval = -EIO; 1575 goto done; 1576 } 1577 async = s->async; 1578 1579 if (!nbytes) { 1580 retval = 0; 1581 goto done; 1582 } 1583 if (!s->busy) { 1584 retval = 0; 1585 goto done; 1586 } 1587 if (s->busy != file) { 1588 retval = -EACCES; 1589 goto done; 1590 } 1591 add_wait_queue(&async->wait_head, &wait); 1592 while (nbytes > 0 && !retval) { 1593 set_current_state(TASK_INTERRUPTIBLE); 1594 1595 if (!(comedi_get_subdevice_runflags(s) & SRF_RUNNING)) { 1596 if (count == 0) { 1597 if (comedi_get_subdevice_runflags(s) & 1598 SRF_ERROR) { 1599 retval = -EPIPE; 1600 } else { 1601 retval = 0; 1602 } 1603 do_become_nonbusy(dev, s); 1604 } 1605 break; 1606 } 1607 1608 n = nbytes; 1609 1610 m = n; 1611 if (async->buf_write_ptr + m > async->prealloc_bufsz) 1612 m = async->prealloc_bufsz - async->buf_write_ptr; 1613 comedi_buf_write_alloc(async, async->prealloc_bufsz); 1614 if (m > comedi_buf_write_n_allocated(async)) 1615 m = comedi_buf_write_n_allocated(async); 1616 if (m < n) 1617 n = m; 1618 1619 if (n == 0) { 1620 if (file->f_flags & O_NONBLOCK) { 1621 retval = -EAGAIN; 1622 break; 1623 } 1624 if (signal_pending(current)) { 1625 retval = -ERESTARTSYS; 1626 break; 1627 } 1628 schedule(); 1629 if (!s->busy) 1630 break; 1631 if (s->busy != file) { 1632 retval = -EACCES; 1633 break; 1634 } 1635 continue; 1636 } 1637 1638 m = copy_from_user(async->prealloc_buf + async->buf_write_ptr, 1639 buf, n); 1640 if (m) { 1641 n -= m; 1642 retval = -EFAULT; 1643 } 1644 comedi_buf_write_free(async, n); 1645 1646 count += n; 1647 nbytes -= n; 1648 1649 buf += n; 1650 break; /* makes device work like a pipe */ 1651 } 1652 set_current_state(TASK_RUNNING); 1653 remove_wait_queue(&async->wait_head, &wait); 1654 1655done: 1656 return count ? count : retval; 1657} 1658 1659static ssize_t comedi_read(struct file *file, char __user *buf, size_t nbytes, 1660 loff_t *offset) 1661{ 1662 struct comedi_subdevice *s; 1663 struct comedi_async *async; 1664 int n, m, count = 0, retval = 0; 1665 DECLARE_WAITQUEUE(wait, current); 1666 const unsigned minor = iminor(file->f_dentry->d_inode); 1667 struct comedi_device_file_info *dev_file_info = 1668 comedi_get_device_file_info(minor); 1669 struct comedi_device *dev = dev_file_info->device; 1670 1671 if (!dev->attached) { 1672 DPRINTK("no driver configured on comedi%i\n", dev->minor); 1673 retval = -ENODEV; 1674 goto done; 1675 } 1676 1677 s = comedi_get_read_subdevice(dev_file_info); 1678 if (s == NULL) { 1679 retval = -EIO; 1680 goto done; 1681 } 1682 async = s->async; 1683 if (!nbytes) { 1684 retval = 0; 1685 goto done; 1686 } 1687 if (!s->busy) { 1688 retval = 0; 1689 goto done; 1690 } 1691 if (s->busy != file) { 1692 retval = -EACCES; 1693 goto done; 1694 } 1695 1696 add_wait_queue(&async->wait_head, &wait); 1697 while (nbytes > 0 && !retval) { 1698 set_current_state(TASK_INTERRUPTIBLE); 1699 1700 n = nbytes; 1701 1702 m = comedi_buf_read_n_available(async); 1703 /* printk("%d available\n",m); */ 1704 if (async->buf_read_ptr + m > async->prealloc_bufsz) 1705 m = async->prealloc_bufsz - async->buf_read_ptr; 1706 /* printk("%d contiguous\n",m); */ 1707 if (m < n) 1708 n = m; 1709 1710 if (n == 0) { 1711 if (!(comedi_get_subdevice_runflags(s) & SRF_RUNNING)) { 1712 do_become_nonbusy(dev, s); 1713 if (comedi_get_subdevice_runflags(s) & 1714 SRF_ERROR) { 1715 retval = -EPIPE; 1716 } else { 1717 retval = 0; 1718 } 1719 break; 1720 } 1721 if (file->f_flags & O_NONBLOCK) { 1722 retval = -EAGAIN; 1723 break; 1724 } 1725 if (signal_pending(current)) { 1726 retval = -ERESTARTSYS; 1727 break; 1728 } 1729 schedule(); 1730 if (!s->busy) { 1731 retval = 0; 1732 break; 1733 } 1734 if (s->busy != file) { 1735 retval = -EACCES; 1736 break; 1737 } 1738 continue; 1739 } 1740 m = copy_to_user(buf, async->prealloc_buf + 1741 async->buf_read_ptr, n); 1742 if (m) { 1743 n -= m; 1744 retval = -EFAULT; 1745 } 1746 1747 comedi_buf_read_alloc(async, n); 1748 comedi_buf_read_free(async, n); 1749 1750 count += n; 1751 nbytes -= n; 1752 1753 buf += n; 1754 break; /* makes device work like a pipe */ 1755 } 1756 if (!(comedi_get_subdevice_runflags(s) & (SRF_ERROR | SRF_RUNNING)) && 1757 async->buf_read_count - async->buf_write_count == 0) { 1758 do_become_nonbusy(dev, s); 1759 } 1760 set_current_state(TASK_RUNNING); 1761 remove_wait_queue(&async->wait_head, &wait); 1762 1763done: 1764 return count ? count : retval; 1765} 1766 1767/* 1768 This function restores a subdevice to an idle state. 1769 */ 1770void do_become_nonbusy(struct comedi_device *dev, struct comedi_subdevice *s) 1771{ 1772 struct comedi_async *async = s->async; 1773 1774 comedi_set_subdevice_runflags(s, SRF_RUNNING, 0); 1775 if (async) { 1776 comedi_reset_async_buf(async); 1777 async->inttrig = NULL; 1778 } else { 1779 printk(KERN_ERR 1780 "BUG: (?) do_become_nonbusy called with async=0\n"); 1781 } 1782 1783 s->busy = NULL; 1784} 1785 1786static int comedi_open(struct inode *inode, struct file *file) 1787{ 1788 const unsigned minor = iminor(inode); 1789 struct comedi_device_file_info *dev_file_info = 1790 comedi_get_device_file_info(minor); 1791 struct comedi_device *dev = 1792 dev_file_info ? dev_file_info->device : NULL; 1793 1794 if (dev == NULL) { 1795 DPRINTK("invalid minor number\n"); 1796 return -ENODEV; 1797 } 1798 1799 /* This is slightly hacky, but we want module autoloading 1800 * to work for root. 1801 * case: user opens device, attached -> ok 1802 * case: user opens device, unattached, in_request_module=0 -> autoload 1803 * case: user opens device, unattached, in_request_module=1 -> fail 1804 * case: root opens device, attached -> ok 1805 * case: root opens device, unattached, in_request_module=1 -> ok 1806 * (typically called from modprobe) 1807 * case: root opens device, unattached, in_request_module=0 -> autoload 1808 * 1809 * The last could be changed to "-> ok", which would deny root 1810 * autoloading. 1811 */ 1812 mutex_lock(&dev->mutex); 1813 if (dev->attached) 1814 goto ok; 1815 if (!capable(CAP_NET_ADMIN) && dev->in_request_module) { 1816 DPRINTK("in request module\n"); 1817 mutex_unlock(&dev->mutex); 1818 return -ENODEV; 1819 } 1820 if (capable(CAP_NET_ADMIN) && dev->in_request_module) 1821 goto ok; 1822 1823 dev->in_request_module = 1; 1824 1825#ifdef CONFIG_KMOD 1826 mutex_unlock(&dev->mutex); 1827 request_module("char-major-%i-%i", COMEDI_MAJOR, dev->minor); 1828 mutex_lock(&dev->mutex); 1829#endif 1830 1831 dev->in_request_module = 0; 1832 1833 if (!dev->attached && !capable(CAP_NET_ADMIN)) { 1834 DPRINTK("not attached and not CAP_NET_ADMIN\n"); 1835 mutex_unlock(&dev->mutex); 1836 return -ENODEV; 1837 } 1838ok: 1839 __module_get(THIS_MODULE); 1840 1841 if (dev->attached) { 1842 if (!try_module_get(dev->driver->module)) { 1843 module_put(THIS_MODULE); 1844 mutex_unlock(&dev->mutex); 1845 return -ENOSYS; 1846 } 1847 } 1848 1849 if (dev->attached && dev->use_count == 0 && dev->open) { 1850 int rc = dev->open(dev); 1851 if (rc < 0) { 1852 module_put(dev->driver->module); 1853 module_put(THIS_MODULE); 1854 mutex_unlock(&dev->mutex); 1855 return rc; 1856 } 1857 } 1858 1859 dev->use_count++; 1860 1861 mutex_unlock(&dev->mutex); 1862 1863 return 0; 1864} 1865 1866static int comedi_close(struct inode *inode, struct file *file) 1867{ 1868 const unsigned minor = iminor(inode); 1869 struct comedi_device_file_info *dev_file_info = 1870 comedi_get_device_file_info(minor); 1871 struct comedi_device *dev = dev_file_info->device; 1872 struct comedi_subdevice *s = NULL; 1873 int i; 1874 1875 mutex_lock(&dev->mutex); 1876 1877 if (dev->subdevices) { 1878 for (i = 0; i < dev->n_subdevices; i++) { 1879 s = dev->subdevices + i; 1880 1881 if (s->busy == file) 1882 do_cancel(dev, s); 1883 if (s->lock == file) 1884 s->lock = NULL; 1885 } 1886 } 1887 if (dev->attached && dev->use_count == 1 && dev->close) 1888 dev->close(dev); 1889 1890 module_put(THIS_MODULE); 1891 if (dev->attached) 1892 module_put(dev->driver->module); 1893 1894 dev->use_count--; 1895 1896 mutex_unlock(&dev->mutex); 1897 1898 if (file->f_flags & FASYNC) 1899 comedi_fasync(-1, file, 0); 1900 1901 return 0; 1902} 1903 1904static int comedi_fasync(int fd, struct file *file, int on) 1905{ 1906 const unsigned minor = iminor(file->f_dentry->d_inode); 1907 struct comedi_device_file_info *dev_file_info = 1908 comedi_get_device_file_info(minor); 1909 1910 struct comedi_device *dev = dev_file_info->device; 1911 1912 return fasync_helper(fd, file, on, &dev->async_queue); 1913} 1914 1915const struct file_operations comedi_fops = { 1916 .owner = THIS_MODULE, 1917 .unlocked_ioctl = comedi_unlocked_ioctl, 1918 .compat_ioctl = comedi_compat_ioctl, 1919 .open = comedi_open, 1920 .release = comedi_close, 1921 .read = comedi_read, 1922 .write = comedi_write, 1923 .mmap = comedi_mmap, 1924 .poll = comedi_poll, 1925 .fasync = comedi_fasync, 1926}; 1927 1928struct class *comedi_class; 1929static struct cdev comedi_cdev; 1930 1931static void comedi_cleanup_legacy_minors(void) 1932{ 1933 unsigned i; 1934 1935 for (i = 0; i < comedi_num_legacy_minors; i++) 1936 comedi_free_board_minor(i); 1937} 1938 1939static int __init comedi_init(void) 1940{ 1941 int i; 1942 int retval; 1943 1944 printk(KERN_INFO "comedi: version " COMEDI_RELEASE 1945 " - http://www.comedi.org\n"); 1946 1947 if (comedi_num_legacy_minors < 0 || 1948 comedi_num_legacy_minors > COMEDI_NUM_BOARD_MINORS) { 1949 printk(KERN_ERR "comedi: error: invalid value for module " 1950 "parameter \"comedi_num_legacy_minors\". Valid values " 1951 "are 0 through %i.\n", COMEDI_NUM_BOARD_MINORS); 1952 return -EINVAL; 1953 } 1954 1955 /* 1956 * comedi is unusable if both comedi_autoconfig and 1957 * comedi_num_legacy_minors are zero, so we might as well adjust the 1958 * defaults in that case 1959 */ 1960 if (comedi_autoconfig == 0 && comedi_num_legacy_minors == 0) 1961 comedi_num_legacy_minors = 16; 1962 1963 memset(comedi_file_info_table, 0, 1964 sizeof(struct comedi_device_file_info *) * COMEDI_NUM_MINORS); 1965 1966 retval = register_chrdev_region(MKDEV(COMEDI_MAJOR, 0), 1967 COMEDI_NUM_MINORS, "comedi"); 1968 if (retval) 1969 return -EIO; 1970 cdev_init(&comedi_cdev, &comedi_fops); 1971 comedi_cdev.owner = THIS_MODULE; 1972 kobject_set_name(&comedi_cdev.kobj, "comedi"); 1973 if (cdev_add(&comedi_cdev, MKDEV(COMEDI_MAJOR, 0), COMEDI_NUM_MINORS)) { 1974 unregister_chrdev_region(MKDEV(COMEDI_MAJOR, 0), 1975 COMEDI_NUM_MINORS); 1976 return -EIO; 1977 } 1978 comedi_class = class_create(THIS_MODULE, "comedi"); 1979 if (IS_ERR(comedi_class)) { 1980 printk(KERN_ERR "comedi: failed to create class"); 1981 cdev_del(&comedi_cdev); 1982 unregister_chrdev_region(MKDEV(COMEDI_MAJOR, 0), 1983 COMEDI_NUM_MINORS); 1984 return PTR_ERR(comedi_class); 1985 } 1986 1987 /* XXX requires /proc interface */ 1988 comedi_proc_init(); 1989 1990 /* create devices files for legacy/manual use */ 1991 for (i = 0; i < comedi_num_legacy_minors; i++) { 1992 int minor; 1993 minor = comedi_alloc_board_minor(NULL); 1994 if (minor < 0) { 1995 comedi_cleanup_legacy_minors(); 1996 cdev_del(&comedi_cdev); 1997 unregister_chrdev_region(MKDEV(COMEDI_MAJOR, 0), 1998 COMEDI_NUM_MINORS); 1999 return minor; 2000 } 2001 } 2002 2003 return 0; 2004} 2005 2006static void __exit comedi_cleanup(void) 2007{ 2008 int i; 2009 2010 comedi_cleanup_legacy_minors(); 2011 for (i = 0; i < COMEDI_NUM_MINORS; ++i) 2012 BUG_ON(comedi_file_info_table[i]); 2013 2014 class_destroy(comedi_class); 2015 cdev_del(&comedi_cdev); 2016 unregister_chrdev_region(MKDEV(COMEDI_MAJOR, 0), COMEDI_NUM_MINORS); 2017 2018 comedi_proc_cleanup(); 2019} 2020 2021module_init(comedi_init); 2022module_exit(comedi_cleanup); 2023 2024void comedi_error(const struct comedi_device *dev, const char *s) 2025{ 2026 printk(KERN_ERR "comedi%d: %s: %s\n", dev->minor, 2027 dev->driver->driver_name, s); 2028} 2029EXPORT_SYMBOL(comedi_error); 2030 2031void comedi_event(struct comedi_device *dev, struct comedi_subdevice *s) 2032{ 2033 struct comedi_async *async = s->async; 2034 unsigned runflags = 0; 2035 unsigned runflags_mask = 0; 2036 2037 /* DPRINTK("comedi_event 0x%x\n",mask); */ 2038 2039 if ((comedi_get_subdevice_runflags(s) & SRF_RUNNING) == 0) 2040 return; 2041 2042 if (s-> 2043 async->events & (COMEDI_CB_EOA | COMEDI_CB_ERROR | 2044 COMEDI_CB_OVERFLOW)) { 2045 runflags_mask |= SRF_RUNNING; 2046 } 2047 /* remember if an error event has occured, so an error 2048 * can be returned the next time the user does a read() */ 2049 if (s->async->events & (COMEDI_CB_ERROR | COMEDI_CB_OVERFLOW)) { 2050 runflags_mask |= SRF_ERROR; 2051 runflags |= SRF_ERROR; 2052 } 2053 if (runflags_mask) { 2054 /*sets SRF_ERROR and SRF_RUNNING together atomically */ 2055 comedi_set_subdevice_runflags(s, runflags_mask, runflags); 2056 } 2057 2058 if (async->cb_mask & s->async->events) { 2059 if (comedi_get_subdevice_runflags(s) & SRF_USER) { 2060 wake_up_interruptible(&async->wait_head); 2061 if (s->subdev_flags & SDF_CMD_READ) 2062 kill_fasync(&dev->async_queue, SIGIO, POLL_IN); 2063 if (s->subdev_flags & SDF_CMD_WRITE) 2064 kill_fasync(&dev->async_queue, SIGIO, POLL_OUT); 2065 } else { 2066 if (async->cb_func) 2067 async->cb_func(s->async->events, async->cb_arg); 2068 } 2069 } 2070 s->async->events = 0; 2071} 2072EXPORT_SYMBOL(comedi_event); 2073 2074unsigned comedi_get_subdevice_runflags(struct comedi_subdevice *s) 2075{ 2076 unsigned long flags; 2077 unsigned runflags; 2078 2079 spin_lock_irqsave(&s->spin_lock, flags); 2080 runflags = s->runflags; 2081 spin_unlock_irqrestore(&s->spin_lock, flags); 2082 return runflags; 2083} 2084EXPORT_SYMBOL(comedi_get_subdevice_runflags); 2085 2086static int is_device_busy(struct comedi_device *dev) 2087{ 2088 struct comedi_subdevice *s; 2089 int i; 2090 2091 if (!dev->attached) 2092 return 0; 2093 2094 for (i = 0; i < dev->n_subdevices; i++) { 2095 s = dev->subdevices + i; 2096 if (s->busy) 2097 return 1; 2098 if (s->async && s->async->mmap_count) 2099 return 1; 2100 } 2101 2102 return 0; 2103} 2104 2105static void comedi_device_init(struct comedi_device *dev) 2106{ 2107 memset(dev, 0, sizeof(struct comedi_device)); 2108 spin_lock_init(&dev->spinlock); 2109 mutex_init(&dev->mutex); 2110 dev->minor = -1; 2111} 2112 2113static void comedi_device_cleanup(struct comedi_device *dev) 2114{ 2115 if (dev == NULL) 2116 return; 2117 mutex_lock(&dev->mutex); 2118 comedi_device_detach(dev); 2119 mutex_unlock(&dev->mutex); 2120 mutex_destroy(&dev->mutex); 2121} 2122 2123int comedi_alloc_board_minor(struct device *hardware_device) 2124{ 2125 unsigned long flags; 2126 struct comedi_device_file_info *info; 2127 struct device *csdev; 2128 unsigned i; 2129 int retval; 2130 2131 info = kzalloc(sizeof(struct comedi_device_file_info), GFP_KERNEL); 2132 if (info == NULL) 2133 return -ENOMEM; 2134 info->device = kzalloc(sizeof(struct comedi_device), GFP_KERNEL); 2135 if (info->device == NULL) { 2136 kfree(info); 2137 return -ENOMEM; 2138 } 2139 comedi_device_init(info->device); 2140 spin_lock_irqsave(&comedi_file_info_table_lock, flags); 2141 for (i = 0; i < COMEDI_NUM_BOARD_MINORS; ++i) { 2142 if (comedi_file_info_table[i] == NULL) { 2143 comedi_file_info_table[i] = info; 2144 break; 2145 } 2146 } 2147 spin_unlock_irqrestore(&comedi_file_info_table_lock, flags); 2148 if (i == COMEDI_NUM_BOARD_MINORS) { 2149 comedi_device_cleanup(info->device); 2150 kfree(info->device); 2151 kfree(info); 2152 printk(KERN_ERR 2153 "comedi: error: " 2154 "ran out of minor numbers for board device files.\n"); 2155 return -EBUSY; 2156 } 2157 info->device->minor = i; 2158 csdev = COMEDI_DEVICE_CREATE(comedi_class, NULL, 2159 MKDEV(COMEDI_MAJOR, i), NULL, 2160 hardware_device, "comedi%i", i); 2161 if (!IS_ERR(csdev)) 2162 info->device->class_dev = csdev; 2163 dev_set_drvdata(csdev, info); 2164 retval = device_create_file(csdev, &dev_attr_max_read_buffer_kb); 2165 if (retval) { 2166 printk(KERN_ERR 2167 "comedi: " 2168 "failed to create sysfs attribute file \"%s\".\n", 2169 dev_attr_max_read_buffer_kb.attr.name); 2170 comedi_free_board_minor(i); 2171 return retval; 2172 } 2173 retval = device_create_file(csdev, &dev_attr_read_buffer_kb); 2174 if (retval) { 2175 printk(KERN_ERR 2176 "comedi: " 2177 "failed to create sysfs attribute file \"%s\".\n", 2178 dev_attr_read_buffer_kb.attr.name); 2179 comedi_free_board_minor(i); 2180 return retval; 2181 } 2182 retval = device_create_file(csdev, &dev_attr_max_write_buffer_kb); 2183 if (retval) { 2184 printk(KERN_ERR 2185 "comedi: " 2186 "failed to create sysfs attribute file \"%s\".\n", 2187 dev_attr_max_write_buffer_kb.attr.name); 2188 comedi_free_board_minor(i); 2189 return retval; 2190 } 2191 retval = device_create_file(csdev, &dev_attr_write_buffer_kb); 2192 if (retval) { 2193 printk(KERN_ERR 2194 "comedi: " 2195 "failed to create sysfs attribute file \"%s\".\n", 2196 dev_attr_write_buffer_kb.attr.name); 2197 comedi_free_board_minor(i); 2198 return retval; 2199 } 2200 return i; 2201} 2202 2203void comedi_free_board_minor(unsigned minor) 2204{ 2205 unsigned long flags; 2206 struct comedi_device_file_info *info; 2207 2208 BUG_ON(minor >= COMEDI_NUM_BOARD_MINORS); 2209 spin_lock_irqsave(&comedi_file_info_table_lock, flags); 2210 info = comedi_file_info_table[minor]; 2211 comedi_file_info_table[minor] = NULL; 2212 spin_unlock_irqrestore(&comedi_file_info_table_lock, flags); 2213 2214 if (info) { 2215 struct comedi_device *dev = info->device; 2216 if (dev) { 2217 if (dev->class_dev) { 2218 device_destroy(comedi_class, 2219 MKDEV(COMEDI_MAJOR, dev->minor)); 2220 } 2221 comedi_device_cleanup(dev); 2222 kfree(dev); 2223 } 2224 kfree(info); 2225 } 2226} 2227 2228int comedi_alloc_subdevice_minor(struct comedi_device *dev, 2229 struct comedi_subdevice *s) 2230{ 2231 unsigned long flags; 2232 struct comedi_device_file_info *info; 2233 struct device *csdev; 2234 unsigned i; 2235 int retval; 2236 2237 info = kmalloc(sizeof(struct comedi_device_file_info), GFP_KERNEL); 2238 if (info == NULL) 2239 return -ENOMEM; 2240 info->device = dev; 2241 info->read_subdevice = s; 2242 info->write_subdevice = s; 2243 spin_lock_irqsave(&comedi_file_info_table_lock, flags); 2244 for (i = COMEDI_FIRST_SUBDEVICE_MINOR; i < COMEDI_NUM_MINORS; ++i) { 2245 if (comedi_file_info_table[i] == NULL) { 2246 comedi_file_info_table[i] = info; 2247 break; 2248 } 2249 } 2250 spin_unlock_irqrestore(&comedi_file_info_table_lock, flags); 2251 if (i == COMEDI_NUM_MINORS) { 2252 kfree(info); 2253 printk(KERN_ERR 2254 "comedi: error: " 2255 "ran out of minor numbers for board device files.\n"); 2256 return -EBUSY; 2257 } 2258 s->minor = i; 2259 csdev = COMEDI_DEVICE_CREATE(comedi_class, dev->class_dev, 2260 MKDEV(COMEDI_MAJOR, i), NULL, NULL, 2261 "comedi%i_subd%i", dev->minor, 2262 (int)(s - dev->subdevices)); 2263 if (!IS_ERR(csdev)) 2264 s->class_dev = csdev; 2265 dev_set_drvdata(csdev, info); 2266 retval = device_create_file(csdev, &dev_attr_max_read_buffer_kb); 2267 if (retval) { 2268 printk(KERN_ERR 2269 "comedi: " 2270 "failed to create sysfs attribute file \"%s\".\n", 2271 dev_attr_max_read_buffer_kb.attr.name); 2272 comedi_free_subdevice_minor(s); 2273 return retval; 2274 } 2275 retval = device_create_file(csdev, &dev_attr_read_buffer_kb); 2276 if (retval) { 2277 printk(KERN_ERR 2278 "comedi: " 2279 "failed to create sysfs attribute file \"%s\".\n", 2280 dev_attr_read_buffer_kb.attr.name); 2281 comedi_free_subdevice_minor(s); 2282 return retval; 2283 } 2284 retval = device_create_file(csdev, &dev_attr_max_write_buffer_kb); 2285 if (retval) { 2286 printk(KERN_ERR 2287 "comedi: " 2288 "failed to create sysfs attribute file \"%s\".\n", 2289 dev_attr_max_write_buffer_kb.attr.name); 2290 comedi_free_subdevice_minor(s); 2291 return retval; 2292 } 2293 retval = device_create_file(csdev, &dev_attr_write_buffer_kb); 2294 if (retval) { 2295 printk(KERN_ERR 2296 "comedi: " 2297 "failed to create sysfs attribute file \"%s\".\n", 2298 dev_attr_write_buffer_kb.attr.name); 2299 comedi_free_subdevice_minor(s); 2300 return retval; 2301 } 2302 return i; 2303} 2304 2305void comedi_free_subdevice_minor(struct comedi_subdevice *s) 2306{ 2307 unsigned long flags; 2308 struct comedi_device_file_info *info; 2309 2310 if (s == NULL) 2311 return; 2312 if (s->minor < 0) 2313 return; 2314 2315 BUG_ON(s->minor >= COMEDI_NUM_MINORS); 2316 BUG_ON(s->minor < COMEDI_FIRST_SUBDEVICE_MINOR); 2317 2318 spin_lock_irqsave(&comedi_file_info_table_lock, flags); 2319 info = comedi_file_info_table[s->minor]; 2320 comedi_file_info_table[s->minor] = NULL; 2321 spin_unlock_irqrestore(&comedi_file_info_table_lock, flags); 2322 2323 if (s->class_dev) { 2324 device_destroy(comedi_class, MKDEV(COMEDI_MAJOR, s->minor)); 2325 s->class_dev = NULL; 2326 } 2327 kfree(info); 2328} 2329 2330struct comedi_device_file_info *comedi_get_device_file_info(unsigned minor) 2331{ 2332 unsigned long flags; 2333 struct comedi_device_file_info *info; 2334 2335 BUG_ON(minor >= COMEDI_NUM_MINORS); 2336 spin_lock_irqsave(&comedi_file_info_table_lock, flags); 2337 info = comedi_file_info_table[minor]; 2338 spin_unlock_irqrestore(&comedi_file_info_table_lock, flags); 2339 return info; 2340} 2341EXPORT_SYMBOL_GPL(comedi_get_device_file_info); 2342 2343static int resize_async_buffer(struct comedi_device *dev, 2344 struct comedi_subdevice *s, 2345 struct comedi_async *async, unsigned new_size) 2346{ 2347 int retval; 2348 2349 if (new_size > async->max_bufsize) 2350 return -EPERM; 2351 2352 if (s->busy) { 2353 DPRINTK("subdevice is busy, cannot resize buffer\n"); 2354 return -EBUSY; 2355 } 2356 if (async->mmap_count) { 2357 DPRINTK("subdevice is mmapped, cannot resize buffer\n"); 2358 return -EBUSY; 2359 } 2360 2361 if (!async->prealloc_buf) 2362 return -EINVAL; 2363 2364 /* make sure buffer is an integral number of pages 2365 * (we round up) */ 2366 new_size = (new_size + PAGE_SIZE - 1) & PAGE_MASK; 2367 2368 retval = comedi_buf_alloc(dev, s, new_size); 2369 if (retval < 0) 2370 return retval; 2371 2372 if (s->buf_change) { 2373 retval = s->buf_change(dev, s, new_size); 2374 if (retval < 0) 2375 return retval; 2376 } 2377 2378 DPRINTK("comedi%i subd %d buffer resized to %i bytes\n", 2379 dev->minor, (int)(s - dev->subdevices), async->prealloc_bufsz); 2380 return 0; 2381} 2382 2383/* sysfs attribute files */ 2384 2385static const unsigned bytes_per_kibi = 1024; 2386 2387static ssize_t show_max_read_buffer_kb(struct device *dev, 2388 struct device_attribute *attr, char *buf) 2389{ 2390 ssize_t retval; 2391 struct comedi_device_file_info *info = dev_get_drvdata(dev); 2392 unsigned max_buffer_size_kb = 0; 2393 struct comedi_subdevice *const read_subdevice = 2394 comedi_get_read_subdevice(info); 2395 2396 mutex_lock(&info->device->mutex); 2397 if (read_subdevice && 2398 (read_subdevice->subdev_flags & SDF_CMD_READ) && 2399 read_subdevice->async) { 2400 max_buffer_size_kb = read_subdevice->async->max_bufsize / 2401 bytes_per_kibi; 2402 } 2403 retval = snprintf(buf, PAGE_SIZE, "%i\n", max_buffer_size_kb); 2404 mutex_unlock(&info->device->mutex); 2405 2406 return retval; 2407} 2408 2409static ssize_t store_max_read_buffer_kb(struct device *dev, 2410 struct device_attribute *attr, 2411 const char *buf, size_t count) 2412{ 2413 struct comedi_device_file_info *info = dev_get_drvdata(dev); 2414 unsigned long new_max_size_kb; 2415 uint64_t new_max_size; 2416 struct comedi_subdevice *const read_subdevice = 2417 comedi_get_read_subdevice(info); 2418 2419 if (strict_strtoul(buf, 10, &new_max_size_kb)) 2420 return -EINVAL; 2421 if (new_max_size_kb != (uint32_t) new_max_size_kb) 2422 return -EINVAL; 2423 new_max_size = ((uint64_t) new_max_size_kb) * bytes_per_kibi; 2424 if (new_max_size != (uint32_t) new_max_size) 2425 return -EINVAL; 2426 2427 mutex_lock(&info->device->mutex); 2428 if (read_subdevice == NULL || 2429 (read_subdevice->subdev_flags & SDF_CMD_READ) == 0 || 2430 read_subdevice->async == NULL) { 2431 mutex_unlock(&info->device->mutex); 2432 return -EINVAL; 2433 } 2434 read_subdevice->async->max_bufsize = new_max_size; 2435 mutex_unlock(&info->device->mutex); 2436 2437 return count; 2438} 2439 2440static struct device_attribute dev_attr_max_read_buffer_kb = { 2441 .attr = { 2442 .name = "max_read_buffer_kb", 2443 .mode = S_IRUGO | S_IWUSR}, 2444 .show = &show_max_read_buffer_kb, 2445 .store = &store_max_read_buffer_kb 2446}; 2447 2448static ssize_t show_read_buffer_kb(struct device *dev, 2449 struct device_attribute *attr, char *buf) 2450{ 2451 ssize_t retval; 2452 struct comedi_device_file_info *info = dev_get_drvdata(dev); 2453 unsigned buffer_size_kb = 0; 2454 struct comedi_subdevice *const read_subdevice = 2455 comedi_get_read_subdevice(info); 2456 2457 mutex_lock(&info->device->mutex); 2458 if (read_subdevice && 2459 (read_subdevice->subdev_flags & SDF_CMD_READ) && 2460 read_subdevice->async) { 2461 buffer_size_kb = read_subdevice->async->prealloc_bufsz / 2462 bytes_per_kibi; 2463 } 2464 retval = snprintf(buf, PAGE_SIZE, "%i\n", buffer_size_kb); 2465 mutex_unlock(&info->device->mutex); 2466 2467 return retval; 2468} 2469 2470static ssize_t store_read_buffer_kb(struct device *dev, 2471 struct device_attribute *attr, 2472 const char *buf, size_t count) 2473{ 2474 struct comedi_device_file_info *info = dev_get_drvdata(dev); 2475 unsigned long new_size_kb; 2476 uint64_t new_size; 2477 int retval; 2478 struct comedi_subdevice *const read_subdevice = 2479 comedi_get_read_subdevice(info); 2480 2481 if (strict_strtoul(buf, 10, &new_size_kb)) 2482 return -EINVAL; 2483 if (new_size_kb != (uint32_t) new_size_kb) 2484 return -EINVAL; 2485 new_size = ((uint64_t) new_size_kb) * bytes_per_kibi; 2486 if (new_size != (uint32_t) new_size) 2487 return -EINVAL; 2488 2489 mutex_lock(&info->device->mutex); 2490 if (read_subdevice == NULL || 2491 (read_subdevice->subdev_flags & SDF_CMD_READ) == 0 || 2492 read_subdevice->async == NULL) { 2493 mutex_unlock(&info->device->mutex); 2494 return -EINVAL; 2495 } 2496 retval = resize_async_buffer(info->device, read_subdevice, 2497 read_subdevice->async, new_size); 2498 mutex_unlock(&info->device->mutex); 2499 2500 if (retval < 0) 2501 return retval; 2502 return count; 2503} 2504 2505static struct device_attribute dev_attr_read_buffer_kb = { 2506 .attr = { 2507 .name = "read_buffer_kb", 2508 .mode = S_IRUGO | S_IWUSR | S_IWGRP}, 2509 .show = &show_read_buffer_kb, 2510 .store = &store_read_buffer_kb 2511}; 2512 2513static ssize_t show_max_write_buffer_kb(struct device *dev, 2514 struct device_attribute *attr, 2515 char *buf) 2516{ 2517 ssize_t retval; 2518 struct comedi_device_file_info *info = dev_get_drvdata(dev); 2519 unsigned max_buffer_size_kb = 0; 2520 struct comedi_subdevice *const write_subdevice = 2521 comedi_get_write_subdevice(info); 2522 2523 mutex_lock(&info->device->mutex); 2524 if (write_subdevice && 2525 (write_subdevice->subdev_flags & SDF_CMD_WRITE) && 2526 write_subdevice->async) { 2527 max_buffer_size_kb = write_subdevice->async->max_bufsize / 2528 bytes_per_kibi; 2529 } 2530 retval = snprintf(buf, PAGE_SIZE, "%i\n", max_buffer_size_kb); 2531 mutex_unlock(&info->device->mutex); 2532 2533 return retval; 2534} 2535 2536static ssize_t store_max_write_buffer_kb(struct device *dev, 2537 struct device_attribute *attr, 2538 const char *buf, size_t count) 2539{ 2540 struct comedi_device_file_info *info = dev_get_drvdata(dev); 2541 unsigned long new_max_size_kb; 2542 uint64_t new_max_size; 2543 struct comedi_subdevice *const write_subdevice = 2544 comedi_get_write_subdevice(info); 2545 2546 if (strict_strtoul(buf, 10, &new_max_size_kb)) 2547 return -EINVAL; 2548 if (new_max_size_kb != (uint32_t) new_max_size_kb) 2549 return -EINVAL; 2550 new_max_size = ((uint64_t) new_max_size_kb) * bytes_per_kibi; 2551 if (new_max_size != (uint32_t) new_max_size) 2552 return -EINVAL; 2553 2554 mutex_lock(&info->device->mutex); 2555 if (write_subdevice == NULL || 2556 (write_subdevice->subdev_flags & SDF_CMD_WRITE) == 0 || 2557 write_subdevice->async == NULL) { 2558 mutex_unlock(&info->device->mutex); 2559 return -EINVAL; 2560 } 2561 write_subdevice->async->max_bufsize = new_max_size; 2562 mutex_unlock(&info->device->mutex); 2563 2564 return count; 2565} 2566 2567static struct device_attribute dev_attr_max_write_buffer_kb = { 2568 .attr = { 2569 .name = "max_write_buffer_kb", 2570 .mode = S_IRUGO | S_IWUSR}, 2571 .show = &show_max_write_buffer_kb, 2572 .store = &store_max_write_buffer_kb 2573}; 2574 2575static ssize_t show_write_buffer_kb(struct device *dev, 2576 struct device_attribute *attr, char *buf) 2577{ 2578 ssize_t retval; 2579 struct comedi_device_file_info *info = dev_get_drvdata(dev); 2580 unsigned buffer_size_kb = 0; 2581 struct comedi_subdevice *const write_subdevice = 2582 comedi_get_write_subdevice(info); 2583 2584 mutex_lock(&info->device->mutex); 2585 if (write_subdevice && 2586 (write_subdevice->subdev_flags & SDF_CMD_WRITE) && 2587 write_subdevice->async) { 2588 buffer_size_kb = write_subdevice->async->prealloc_bufsz / 2589 bytes_per_kibi; 2590 } 2591 retval = snprintf(buf, PAGE_SIZE, "%i\n", buffer_size_kb); 2592 mutex_unlock(&info->device->mutex); 2593 2594 return retval; 2595} 2596 2597static ssize_t store_write_buffer_kb(struct device *dev, 2598 struct device_attribute *attr, 2599 const char *buf, size_t count) 2600{ 2601 struct comedi_device_file_info *info = dev_get_drvdata(dev); 2602 unsigned long new_size_kb; 2603 uint64_t new_size; 2604 int retval; 2605 struct comedi_subdevice *const write_subdevice = 2606 comedi_get_write_subdevice(info); 2607 2608 if (strict_strtoul(buf, 10, &new_size_kb)) 2609 return -EINVAL; 2610 if (new_size_kb != (uint32_t) new_size_kb) 2611 return -EINVAL; 2612 new_size = ((uint64_t) new_size_kb) * bytes_per_kibi; 2613 if (new_size != (uint32_t) new_size) 2614 return -EINVAL; 2615 2616 mutex_lock(&info->device->mutex); 2617 if (write_subdevice == NULL || 2618 (write_subdevice->subdev_flags & SDF_CMD_WRITE) == 0 || 2619 write_subdevice->async == NULL) { 2620 mutex_unlock(&info->device->mutex); 2621 return -EINVAL; 2622 } 2623 retval = resize_async_buffer(info->device, write_subdevice, 2624 write_subdevice->async, new_size); 2625 mutex_unlock(&info->device->mutex); 2626 2627 if (retval < 0) 2628 return retval; 2629 return count; 2630} 2631 2632static struct device_attribute dev_attr_write_buffer_kb = { 2633 .attr = { 2634 .name = "write_buffer_kb", 2635 .mode = S_IRUGO | S_IWUSR | S_IWGRP}, 2636 .show = &show_write_buffer_kb, 2637 .store = &store_write_buffer_kb 2638}; 2639