comedi_fops.c revision 819cbb120eaec7e014e5abd029260db1ca8c5735
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 strlcpy(devinfo.driver_name, dev->driver->driver_name, COMEDI_NAMELEN); 387 strlcpy(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 } else { 914 /* Most drivers ignore the base channel in 915 * insn->chanspec. Fix this here if 916 * the subdevice has <= 32 channels. */ 917 unsigned int shift; 918 unsigned int orig_mask; 919 920 orig_mask = data[0]; 921 if (s->n_chan <= 32) { 922 shift = CR_CHAN(insn->chanspec); 923 if (shift > 0) { 924 insn->chanspec = 0; 925 data[0] <<= shift; 926 data[1] <<= shift; 927 } 928 } else 929 shift = 0; 930 ret = s->insn_bits(dev, s, insn, data); 931 data[0] = orig_mask; 932 if (shift > 0) 933 data[1] >>= shift; 934 } 935 break; 936 case INSN_CONFIG: 937 ret = check_insn_config_length(insn, data); 938 if (ret) 939 break; 940 ret = s->insn_config(dev, s, insn, data); 941 break; 942 default: 943 ret = -EINVAL; 944 break; 945 } 946 947 s->busy = NULL; 948 } 949 950out: 951 return ret; 952} 953 954/* 955 * COMEDI_INSN 956 * synchronous instructions 957 * 958 * arg: 959 * pointer to insn 960 * 961 * reads: 962 * struct comedi_insn struct at arg 963 * data (for writes) 964 * 965 * writes: 966 * data (for reads) 967 */ 968static int do_insn_ioctl(struct comedi_device *dev, 969 struct comedi_insn __user *arg, void *file) 970{ 971 struct comedi_insn insn; 972 unsigned int *data = NULL; 973 int ret = 0; 974 975 data = kmalloc(sizeof(unsigned int) * MAX_SAMPLES, GFP_KERNEL); 976 if (!data) { 977 ret = -ENOMEM; 978 goto error; 979 } 980 981 if (copy_from_user(&insn, arg, sizeof(struct comedi_insn))) { 982 ret = -EFAULT; 983 goto error; 984 } 985 986 /* This is where the behavior of insn and insnlist deviate. */ 987 if (insn.n > MAX_SAMPLES) 988 insn.n = MAX_SAMPLES; 989 if (insn.insn & INSN_MASK_WRITE) { 990 if (copy_from_user(data, 991 insn.data, 992 insn.n * sizeof(unsigned int))) { 993 ret = -EFAULT; 994 goto error; 995 } 996 } 997 ret = parse_insn(dev, &insn, data, file); 998 if (ret < 0) 999 goto error; 1000 if (insn.insn & INSN_MASK_READ) { 1001 if (copy_to_user(insn.data, 1002 data, 1003 insn.n * sizeof(unsigned int))) { 1004 ret = -EFAULT; 1005 goto error; 1006 } 1007 } 1008 ret = insn.n; 1009 1010error: 1011 kfree(data); 1012 1013 return ret; 1014} 1015 1016static void comedi_set_subdevice_runflags(struct comedi_subdevice *s, 1017 unsigned mask, unsigned bits) 1018{ 1019 unsigned long flags; 1020 1021 spin_lock_irqsave(&s->spin_lock, flags); 1022 s->runflags &= ~mask; 1023 s->runflags |= (bits & mask); 1024 spin_unlock_irqrestore(&s->spin_lock, flags); 1025} 1026 1027static int do_cmd_ioctl(struct comedi_device *dev, 1028 struct comedi_cmd __user *cmd, void *file) 1029{ 1030 struct comedi_cmd user_cmd; 1031 struct comedi_subdevice *s; 1032 struct comedi_async *async; 1033 int ret = 0; 1034 unsigned int __user *chanlist_saver = NULL; 1035 1036 if (copy_from_user(&user_cmd, cmd, sizeof(struct comedi_cmd))) { 1037 DPRINTK("bad cmd address\n"); 1038 return -EFAULT; 1039 } 1040 /* save user's chanlist pointer so it can be restored later */ 1041 chanlist_saver = user_cmd.chanlist; 1042 1043 if (user_cmd.subdev >= dev->n_subdevices) { 1044 DPRINTK("%d no such subdevice\n", user_cmd.subdev); 1045 return -ENODEV; 1046 } 1047 1048 s = dev->subdevices + user_cmd.subdev; 1049 async = s->async; 1050 1051 if (s->type == COMEDI_SUBD_UNUSED) { 1052 DPRINTK("%d not valid subdevice\n", user_cmd.subdev); 1053 return -EIO; 1054 } 1055 1056 if (!s->do_cmd || !s->do_cmdtest || !s->async) { 1057 DPRINTK("subdevice %i does not support commands\n", 1058 user_cmd.subdev); 1059 return -EIO; 1060 } 1061 1062 /* are we locked? (ioctl lock) */ 1063 if (s->lock && s->lock != file) { 1064 DPRINTK("subdevice locked\n"); 1065 return -EACCES; 1066 } 1067 1068 /* are we busy? */ 1069 if (s->busy) { 1070 DPRINTK("subdevice busy\n"); 1071 return -EBUSY; 1072 } 1073 s->busy = file; 1074 1075 /* make sure channel/gain list isn't too long */ 1076 if (user_cmd.chanlist_len > s->len_chanlist) { 1077 DPRINTK("channel/gain list too long %u > %d\n", 1078 user_cmd.chanlist_len, s->len_chanlist); 1079 ret = -EINVAL; 1080 goto cleanup; 1081 } 1082 1083 /* make sure channel/gain list isn't too short */ 1084 if (user_cmd.chanlist_len < 1) { 1085 DPRINTK("channel/gain list too short %u < 1\n", 1086 user_cmd.chanlist_len); 1087 ret = -EINVAL; 1088 goto cleanup; 1089 } 1090 1091 kfree(async->cmd.chanlist); 1092 async->cmd = user_cmd; 1093 async->cmd.data = NULL; 1094 /* load channel/gain list */ 1095 async->cmd.chanlist = 1096 kmalloc(async->cmd.chanlist_len * sizeof(int), GFP_KERNEL); 1097 if (!async->cmd.chanlist) { 1098 DPRINTK("allocation failed\n"); 1099 ret = -ENOMEM; 1100 goto cleanup; 1101 } 1102 1103 if (copy_from_user(async->cmd.chanlist, user_cmd.chanlist, 1104 async->cmd.chanlist_len * sizeof(int))) { 1105 DPRINTK("fault reading chanlist\n"); 1106 ret = -EFAULT; 1107 goto cleanup; 1108 } 1109 1110 /* make sure each element in channel/gain list is valid */ 1111 ret = comedi_check_chanlist(s, 1112 async->cmd.chanlist_len, 1113 async->cmd.chanlist); 1114 if (ret < 0) { 1115 DPRINTK("bad chanlist\n"); 1116 goto cleanup; 1117 } 1118 1119 ret = s->do_cmdtest(dev, s, &async->cmd); 1120 1121 if (async->cmd.flags & TRIG_BOGUS || ret) { 1122 DPRINTK("test returned %d\n", ret); 1123 user_cmd = async->cmd; 1124 /* restore chanlist pointer before copying back */ 1125 user_cmd.chanlist = chanlist_saver; 1126 user_cmd.data = NULL; 1127 if (copy_to_user(cmd, &user_cmd, sizeof(struct comedi_cmd))) { 1128 DPRINTK("fault writing cmd\n"); 1129 ret = -EFAULT; 1130 goto cleanup; 1131 } 1132 ret = -EAGAIN; 1133 goto cleanup; 1134 } 1135 1136 if (!async->prealloc_bufsz) { 1137 ret = -ENOMEM; 1138 DPRINTK("no buffer (?)\n"); 1139 goto cleanup; 1140 } 1141 1142 comedi_reset_async_buf(async); 1143 1144 async->cb_mask = 1145 COMEDI_CB_EOA | COMEDI_CB_BLOCK | COMEDI_CB_ERROR | 1146 COMEDI_CB_OVERFLOW; 1147 if (async->cmd.flags & TRIG_WAKE_EOS) 1148 async->cb_mask |= COMEDI_CB_EOS; 1149 1150 comedi_set_subdevice_runflags(s, ~0, SRF_USER | SRF_RUNNING); 1151 1152 ret = s->do_cmd(dev, s); 1153 if (ret == 0) 1154 return 0; 1155 1156cleanup: 1157 do_become_nonbusy(dev, s); 1158 1159 return ret; 1160} 1161 1162/* 1163 COMEDI_CMDTEST 1164 command testing ioctl 1165 1166 arg: 1167 pointer to cmd structure 1168 1169 reads: 1170 cmd structure at arg 1171 channel/range list 1172 1173 writes: 1174 modified cmd structure at arg 1175 1176*/ 1177static int do_cmdtest_ioctl(struct comedi_device *dev, 1178 struct comedi_cmd __user *arg, void *file) 1179{ 1180 struct comedi_cmd user_cmd; 1181 struct comedi_subdevice *s; 1182 int ret = 0; 1183 unsigned int *chanlist = NULL; 1184 unsigned int __user *chanlist_saver = NULL; 1185 1186 if (copy_from_user(&user_cmd, arg, sizeof(struct comedi_cmd))) { 1187 DPRINTK("bad cmd address\n"); 1188 return -EFAULT; 1189 } 1190 /* save user's chanlist pointer so it can be restored later */ 1191 chanlist_saver = user_cmd.chanlist; 1192 1193 if (user_cmd.subdev >= dev->n_subdevices) { 1194 DPRINTK("%d no such subdevice\n", user_cmd.subdev); 1195 return -ENODEV; 1196 } 1197 1198 s = dev->subdevices + user_cmd.subdev; 1199 if (s->type == COMEDI_SUBD_UNUSED) { 1200 DPRINTK("%d not valid subdevice\n", user_cmd.subdev); 1201 return -EIO; 1202 } 1203 1204 if (!s->do_cmd || !s->do_cmdtest) { 1205 DPRINTK("subdevice %i does not support commands\n", 1206 user_cmd.subdev); 1207 return -EIO; 1208 } 1209 1210 /* make sure channel/gain list isn't too long */ 1211 if (user_cmd.chanlist_len > s->len_chanlist) { 1212 DPRINTK("channel/gain list too long %d > %d\n", 1213 user_cmd.chanlist_len, s->len_chanlist); 1214 ret = -EINVAL; 1215 goto cleanup; 1216 } 1217 1218 /* load channel/gain list */ 1219 if (user_cmd.chanlist) { 1220 chanlist = 1221 kmalloc(user_cmd.chanlist_len * sizeof(int), GFP_KERNEL); 1222 if (!chanlist) { 1223 DPRINTK("allocation failed\n"); 1224 ret = -ENOMEM; 1225 goto cleanup; 1226 } 1227 1228 if (copy_from_user(chanlist, user_cmd.chanlist, 1229 user_cmd.chanlist_len * sizeof(int))) { 1230 DPRINTK("fault reading chanlist\n"); 1231 ret = -EFAULT; 1232 goto cleanup; 1233 } 1234 1235 /* make sure each element in channel/gain list is valid */ 1236 ret = comedi_check_chanlist(s, user_cmd.chanlist_len, chanlist); 1237 if (ret < 0) { 1238 DPRINTK("bad chanlist\n"); 1239 goto cleanup; 1240 } 1241 1242 user_cmd.chanlist = chanlist; 1243 } 1244 1245 ret = s->do_cmdtest(dev, s, &user_cmd); 1246 1247 /* restore chanlist pointer before copying back */ 1248 user_cmd.chanlist = chanlist_saver; 1249 1250 if (copy_to_user(arg, &user_cmd, sizeof(struct comedi_cmd))) { 1251 DPRINTK("bad cmd address\n"); 1252 ret = -EFAULT; 1253 goto cleanup; 1254 } 1255cleanup: 1256 kfree(chanlist); 1257 1258 return ret; 1259} 1260 1261/* 1262 COMEDI_LOCK 1263 lock subdevice 1264 1265 arg: 1266 subdevice number 1267 1268 reads: 1269 none 1270 1271 writes: 1272 none 1273 1274*/ 1275 1276static int do_lock_ioctl(struct comedi_device *dev, unsigned int arg, 1277 void *file) 1278{ 1279 int ret = 0; 1280 unsigned long flags; 1281 struct comedi_subdevice *s; 1282 1283 if (arg >= dev->n_subdevices) 1284 return -EINVAL; 1285 s = dev->subdevices + arg; 1286 1287 spin_lock_irqsave(&s->spin_lock, flags); 1288 if (s->busy || s->lock) 1289 ret = -EBUSY; 1290 else 1291 s->lock = file; 1292 spin_unlock_irqrestore(&s->spin_lock, flags); 1293 1294#if 0 1295 if (ret < 0) 1296 return ret; 1297 1298 if (s->lock_f) 1299 ret = s->lock_f(dev, s); 1300#endif 1301 1302 return ret; 1303} 1304 1305/* 1306 COMEDI_UNLOCK 1307 unlock subdevice 1308 1309 arg: 1310 subdevice number 1311 1312 reads: 1313 none 1314 1315 writes: 1316 none 1317 1318 This function isn't protected by the semaphore, since 1319 we already own the lock. 1320*/ 1321static int do_unlock_ioctl(struct comedi_device *dev, unsigned int arg, 1322 void *file) 1323{ 1324 struct comedi_subdevice *s; 1325 1326 if (arg >= dev->n_subdevices) 1327 return -EINVAL; 1328 s = dev->subdevices + arg; 1329 1330 if (s->busy) 1331 return -EBUSY; 1332 1333 if (s->lock && s->lock != file) 1334 return -EACCES; 1335 1336 if (s->lock == file) { 1337#if 0 1338 if (s->unlock) 1339 s->unlock(dev, s); 1340#endif 1341 1342 s->lock = NULL; 1343 } 1344 1345 return 0; 1346} 1347 1348/* 1349 COMEDI_CANCEL 1350 cancel acquisition ioctl 1351 1352 arg: 1353 subdevice number 1354 1355 reads: 1356 nothing 1357 1358 writes: 1359 nothing 1360 1361*/ 1362static int do_cancel_ioctl(struct comedi_device *dev, unsigned int arg, 1363 void *file) 1364{ 1365 struct comedi_subdevice *s; 1366 1367 if (arg >= dev->n_subdevices) 1368 return -EINVAL; 1369 s = dev->subdevices + arg; 1370 if (s->async == NULL) 1371 return -EINVAL; 1372 1373 if (s->lock && s->lock != file) 1374 return -EACCES; 1375 1376 if (!s->busy) 1377 return 0; 1378 1379 if (s->busy != file) 1380 return -EBUSY; 1381 1382 return do_cancel(dev, s); 1383} 1384 1385/* 1386 COMEDI_POLL ioctl 1387 instructs driver to synchronize buffers 1388 1389 arg: 1390 subdevice number 1391 1392 reads: 1393 nothing 1394 1395 writes: 1396 nothing 1397 1398*/ 1399static int do_poll_ioctl(struct comedi_device *dev, unsigned int arg, 1400 void *file) 1401{ 1402 struct comedi_subdevice *s; 1403 1404 if (arg >= dev->n_subdevices) 1405 return -EINVAL; 1406 s = dev->subdevices + arg; 1407 1408 if (s->lock && s->lock != file) 1409 return -EACCES; 1410 1411 if (!s->busy) 1412 return 0; 1413 1414 if (s->busy != file) 1415 return -EBUSY; 1416 1417 if (s->poll) 1418 return s->poll(dev, s); 1419 1420 return -EINVAL; 1421} 1422 1423static int do_cancel(struct comedi_device *dev, struct comedi_subdevice *s) 1424{ 1425 int ret = 0; 1426 1427 if ((comedi_get_subdevice_runflags(s) & SRF_RUNNING) && s->cancel) 1428 ret = s->cancel(dev, s); 1429 1430 do_become_nonbusy(dev, s); 1431 1432 return ret; 1433} 1434 1435static void comedi_unmap(struct vm_area_struct *area) 1436{ 1437 struct comedi_async *async; 1438 struct comedi_device *dev; 1439 1440 async = area->vm_private_data; 1441 dev = async->subdevice->device; 1442 1443 mutex_lock(&dev->mutex); 1444 async->mmap_count--; 1445 mutex_unlock(&dev->mutex); 1446} 1447 1448static struct vm_operations_struct comedi_vm_ops = { 1449 .close = comedi_unmap, 1450}; 1451 1452static int comedi_mmap(struct file *file, struct vm_area_struct *vma) 1453{ 1454 const unsigned minor = iminor(file->f_dentry->d_inode); 1455 struct comedi_device_file_info *dev_file_info = 1456 comedi_get_device_file_info(minor); 1457 struct comedi_device *dev = dev_file_info->device; 1458 struct comedi_async *async = NULL; 1459 unsigned long start = vma->vm_start; 1460 unsigned long size; 1461 int n_pages; 1462 int i; 1463 int retval; 1464 struct comedi_subdevice *s; 1465 1466 mutex_lock(&dev->mutex); 1467 if (!dev->attached) { 1468 DPRINTK("no driver configured on comedi%i\n", dev->minor); 1469 retval = -ENODEV; 1470 goto done; 1471 } 1472 if (vma->vm_flags & VM_WRITE) 1473 s = comedi_get_write_subdevice(dev_file_info); 1474 else 1475 s = comedi_get_read_subdevice(dev_file_info); 1476 1477 if (s == NULL) { 1478 retval = -EINVAL; 1479 goto done; 1480 } 1481 async = s->async; 1482 if (async == NULL) { 1483 retval = -EINVAL; 1484 goto done; 1485 } 1486 1487 if (vma->vm_pgoff != 0) { 1488 DPRINTK("comedi: mmap() offset must be 0.\n"); 1489 retval = -EINVAL; 1490 goto done; 1491 } 1492 1493 size = vma->vm_end - vma->vm_start; 1494 if (size > async->prealloc_bufsz) { 1495 retval = -EFAULT; 1496 goto done; 1497 } 1498 if (size & (~PAGE_MASK)) { 1499 retval = -EFAULT; 1500 goto done; 1501 } 1502 1503 n_pages = size >> PAGE_SHIFT; 1504 for (i = 0; i < n_pages; ++i) { 1505 if (remap_pfn_range(vma, start, 1506 page_to_pfn(virt_to_page 1507 (async->buf_page_list 1508 [i].virt_addr)), PAGE_SIZE, 1509 PAGE_SHARED)) { 1510 retval = -EAGAIN; 1511 goto done; 1512 } 1513 start += PAGE_SIZE; 1514 } 1515 1516 vma->vm_ops = &comedi_vm_ops; 1517 vma->vm_private_data = async; 1518 1519 async->mmap_count++; 1520 1521 retval = 0; 1522done: 1523 mutex_unlock(&dev->mutex); 1524 return retval; 1525} 1526 1527static unsigned int comedi_poll(struct file *file, poll_table * wait) 1528{ 1529 unsigned int mask = 0; 1530 const unsigned minor = iminor(file->f_dentry->d_inode); 1531 struct comedi_device_file_info *dev_file_info = 1532 comedi_get_device_file_info(minor); 1533 struct comedi_device *dev = dev_file_info->device; 1534 struct comedi_subdevice *read_subdev; 1535 struct comedi_subdevice *write_subdev; 1536 1537 mutex_lock(&dev->mutex); 1538 if (!dev->attached) { 1539 DPRINTK("no driver configured on comedi%i\n", dev->minor); 1540 mutex_unlock(&dev->mutex); 1541 return 0; 1542 } 1543 1544 mask = 0; 1545 read_subdev = comedi_get_read_subdevice(dev_file_info); 1546 if (read_subdev) { 1547 poll_wait(file, &read_subdev->async->wait_head, wait); 1548 if (!read_subdev->busy 1549 || comedi_buf_read_n_available(read_subdev->async) > 0 1550 || !(comedi_get_subdevice_runflags(read_subdev) & 1551 SRF_RUNNING)) { 1552 mask |= POLLIN | POLLRDNORM; 1553 } 1554 } 1555 write_subdev = comedi_get_write_subdevice(dev_file_info); 1556 if (write_subdev) { 1557 poll_wait(file, &write_subdev->async->wait_head, wait); 1558 comedi_buf_write_alloc(write_subdev->async, 1559 write_subdev->async->prealloc_bufsz); 1560 if (!write_subdev->busy 1561 || !(comedi_get_subdevice_runflags(write_subdev) & 1562 SRF_RUNNING) 1563 || comedi_buf_write_n_allocated(write_subdev->async) >= 1564 bytes_per_sample(write_subdev->async->subdevice)) { 1565 mask |= POLLOUT | POLLWRNORM; 1566 } 1567 } 1568 1569 mutex_unlock(&dev->mutex); 1570 return mask; 1571} 1572 1573static ssize_t comedi_write(struct file *file, const char __user *buf, 1574 size_t nbytes, loff_t *offset) 1575{ 1576 struct comedi_subdevice *s; 1577 struct comedi_async *async; 1578 int n, m, count = 0, retval = 0; 1579 DECLARE_WAITQUEUE(wait, current); 1580 const unsigned minor = iminor(file->f_dentry->d_inode); 1581 struct comedi_device_file_info *dev_file_info = 1582 comedi_get_device_file_info(minor); 1583 struct comedi_device *dev = dev_file_info->device; 1584 1585 if (!dev->attached) { 1586 DPRINTK("no driver configured on comedi%i\n", dev->minor); 1587 retval = -ENODEV; 1588 goto done; 1589 } 1590 1591 s = comedi_get_write_subdevice(dev_file_info); 1592 if (s == NULL) { 1593 retval = -EIO; 1594 goto done; 1595 } 1596 async = s->async; 1597 1598 if (!nbytes) { 1599 retval = 0; 1600 goto done; 1601 } 1602 if (!s->busy) { 1603 retval = 0; 1604 goto done; 1605 } 1606 if (s->busy != file) { 1607 retval = -EACCES; 1608 goto done; 1609 } 1610 add_wait_queue(&async->wait_head, &wait); 1611 while (nbytes > 0 && !retval) { 1612 set_current_state(TASK_INTERRUPTIBLE); 1613 1614 if (!(comedi_get_subdevice_runflags(s) & SRF_RUNNING)) { 1615 if (count == 0) { 1616 if (comedi_get_subdevice_runflags(s) & 1617 SRF_ERROR) { 1618 retval = -EPIPE; 1619 } else { 1620 retval = 0; 1621 } 1622 do_become_nonbusy(dev, s); 1623 } 1624 break; 1625 } 1626 1627 n = nbytes; 1628 1629 m = n; 1630 if (async->buf_write_ptr + m > async->prealloc_bufsz) 1631 m = async->prealloc_bufsz - async->buf_write_ptr; 1632 comedi_buf_write_alloc(async, async->prealloc_bufsz); 1633 if (m > comedi_buf_write_n_allocated(async)) 1634 m = comedi_buf_write_n_allocated(async); 1635 if (m < n) 1636 n = m; 1637 1638 if (n == 0) { 1639 if (file->f_flags & O_NONBLOCK) { 1640 retval = -EAGAIN; 1641 break; 1642 } 1643 if (signal_pending(current)) { 1644 retval = -ERESTARTSYS; 1645 break; 1646 } 1647 schedule(); 1648 if (!s->busy) 1649 break; 1650 if (s->busy != file) { 1651 retval = -EACCES; 1652 break; 1653 } 1654 continue; 1655 } 1656 1657 m = copy_from_user(async->prealloc_buf + async->buf_write_ptr, 1658 buf, n); 1659 if (m) { 1660 n -= m; 1661 retval = -EFAULT; 1662 } 1663 comedi_buf_write_free(async, n); 1664 1665 count += n; 1666 nbytes -= n; 1667 1668 buf += n; 1669 break; /* makes device work like a pipe */ 1670 } 1671 set_current_state(TASK_RUNNING); 1672 remove_wait_queue(&async->wait_head, &wait); 1673 1674done: 1675 return count ? count : retval; 1676} 1677 1678static ssize_t comedi_read(struct file *file, char __user *buf, size_t nbytes, 1679 loff_t *offset) 1680{ 1681 struct comedi_subdevice *s; 1682 struct comedi_async *async; 1683 int n, m, count = 0, retval = 0; 1684 DECLARE_WAITQUEUE(wait, current); 1685 const unsigned minor = iminor(file->f_dentry->d_inode); 1686 struct comedi_device_file_info *dev_file_info = 1687 comedi_get_device_file_info(minor); 1688 struct comedi_device *dev = dev_file_info->device; 1689 1690 if (!dev->attached) { 1691 DPRINTK("no driver configured on comedi%i\n", dev->minor); 1692 retval = -ENODEV; 1693 goto done; 1694 } 1695 1696 s = comedi_get_read_subdevice(dev_file_info); 1697 if (s == NULL) { 1698 retval = -EIO; 1699 goto done; 1700 } 1701 async = s->async; 1702 if (!nbytes) { 1703 retval = 0; 1704 goto done; 1705 } 1706 if (!s->busy) { 1707 retval = 0; 1708 goto done; 1709 } 1710 if (s->busy != file) { 1711 retval = -EACCES; 1712 goto done; 1713 } 1714 1715 add_wait_queue(&async->wait_head, &wait); 1716 while (nbytes > 0 && !retval) { 1717 set_current_state(TASK_INTERRUPTIBLE); 1718 1719 n = nbytes; 1720 1721 m = comedi_buf_read_n_available(async); 1722 /* printk("%d available\n",m); */ 1723 if (async->buf_read_ptr + m > async->prealloc_bufsz) 1724 m = async->prealloc_bufsz - async->buf_read_ptr; 1725 /* printk("%d contiguous\n",m); */ 1726 if (m < n) 1727 n = m; 1728 1729 if (n == 0) { 1730 if (!(comedi_get_subdevice_runflags(s) & SRF_RUNNING)) { 1731 do_become_nonbusy(dev, s); 1732 if (comedi_get_subdevice_runflags(s) & 1733 SRF_ERROR) { 1734 retval = -EPIPE; 1735 } else { 1736 retval = 0; 1737 } 1738 break; 1739 } 1740 if (file->f_flags & O_NONBLOCK) { 1741 retval = -EAGAIN; 1742 break; 1743 } 1744 if (signal_pending(current)) { 1745 retval = -ERESTARTSYS; 1746 break; 1747 } 1748 schedule(); 1749 if (!s->busy) { 1750 retval = 0; 1751 break; 1752 } 1753 if (s->busy != file) { 1754 retval = -EACCES; 1755 break; 1756 } 1757 continue; 1758 } 1759 m = copy_to_user(buf, async->prealloc_buf + 1760 async->buf_read_ptr, n); 1761 if (m) { 1762 n -= m; 1763 retval = -EFAULT; 1764 } 1765 1766 comedi_buf_read_alloc(async, n); 1767 comedi_buf_read_free(async, n); 1768 1769 count += n; 1770 nbytes -= n; 1771 1772 buf += n; 1773 break; /* makes device work like a pipe */ 1774 } 1775 if (!(comedi_get_subdevice_runflags(s) & (SRF_ERROR | SRF_RUNNING)) && 1776 async->buf_read_count - async->buf_write_count == 0) { 1777 do_become_nonbusy(dev, s); 1778 } 1779 set_current_state(TASK_RUNNING); 1780 remove_wait_queue(&async->wait_head, &wait); 1781 1782done: 1783 return count ? count : retval; 1784} 1785 1786/* 1787 This function restores a subdevice to an idle state. 1788 */ 1789void do_become_nonbusy(struct comedi_device *dev, struct comedi_subdevice *s) 1790{ 1791 struct comedi_async *async = s->async; 1792 1793 comedi_set_subdevice_runflags(s, SRF_RUNNING, 0); 1794 if (async) { 1795 comedi_reset_async_buf(async); 1796 async->inttrig = NULL; 1797 } else { 1798 printk(KERN_ERR 1799 "BUG: (?) do_become_nonbusy called with async=0\n"); 1800 } 1801 1802 s->busy = NULL; 1803} 1804 1805static int comedi_open(struct inode *inode, struct file *file) 1806{ 1807 const unsigned minor = iminor(inode); 1808 struct comedi_device_file_info *dev_file_info = 1809 comedi_get_device_file_info(minor); 1810 struct comedi_device *dev = 1811 dev_file_info ? dev_file_info->device : NULL; 1812 1813 if (dev == NULL) { 1814 DPRINTK("invalid minor number\n"); 1815 return -ENODEV; 1816 } 1817 1818 /* This is slightly hacky, but we want module autoloading 1819 * to work for root. 1820 * case: user opens device, attached -> ok 1821 * case: user opens device, unattached, in_request_module=0 -> autoload 1822 * case: user opens device, unattached, in_request_module=1 -> fail 1823 * case: root opens device, attached -> ok 1824 * case: root opens device, unattached, in_request_module=1 -> ok 1825 * (typically called from modprobe) 1826 * case: root opens device, unattached, in_request_module=0 -> autoload 1827 * 1828 * The last could be changed to "-> ok", which would deny root 1829 * autoloading. 1830 */ 1831 mutex_lock(&dev->mutex); 1832 if (dev->attached) 1833 goto ok; 1834 if (!capable(CAP_NET_ADMIN) && dev->in_request_module) { 1835 DPRINTK("in request module\n"); 1836 mutex_unlock(&dev->mutex); 1837 return -ENODEV; 1838 } 1839 if (capable(CAP_NET_ADMIN) && dev->in_request_module) 1840 goto ok; 1841 1842 dev->in_request_module = 1; 1843 1844#ifdef CONFIG_KMOD 1845 mutex_unlock(&dev->mutex); 1846 request_module("char-major-%i-%i", COMEDI_MAJOR, dev->minor); 1847 mutex_lock(&dev->mutex); 1848#endif 1849 1850 dev->in_request_module = 0; 1851 1852 if (!dev->attached && !capable(CAP_NET_ADMIN)) { 1853 DPRINTK("not attached and not CAP_NET_ADMIN\n"); 1854 mutex_unlock(&dev->mutex); 1855 return -ENODEV; 1856 } 1857ok: 1858 __module_get(THIS_MODULE); 1859 1860 if (dev->attached) { 1861 if (!try_module_get(dev->driver->module)) { 1862 module_put(THIS_MODULE); 1863 mutex_unlock(&dev->mutex); 1864 return -ENOSYS; 1865 } 1866 } 1867 1868 if (dev->attached && dev->use_count == 0 && dev->open) { 1869 int rc = dev->open(dev); 1870 if (rc < 0) { 1871 module_put(dev->driver->module); 1872 module_put(THIS_MODULE); 1873 mutex_unlock(&dev->mutex); 1874 return rc; 1875 } 1876 } 1877 1878 dev->use_count++; 1879 1880 mutex_unlock(&dev->mutex); 1881 1882 return 0; 1883} 1884 1885static int comedi_close(struct inode *inode, struct file *file) 1886{ 1887 const unsigned minor = iminor(inode); 1888 struct comedi_device_file_info *dev_file_info = 1889 comedi_get_device_file_info(minor); 1890 struct comedi_device *dev = dev_file_info->device; 1891 struct comedi_subdevice *s = NULL; 1892 int i; 1893 1894 mutex_lock(&dev->mutex); 1895 1896 if (dev->subdevices) { 1897 for (i = 0; i < dev->n_subdevices; i++) { 1898 s = dev->subdevices + i; 1899 1900 if (s->busy == file) 1901 do_cancel(dev, s); 1902 if (s->lock == file) 1903 s->lock = NULL; 1904 } 1905 } 1906 if (dev->attached && dev->use_count == 1 && dev->close) 1907 dev->close(dev); 1908 1909 module_put(THIS_MODULE); 1910 if (dev->attached) 1911 module_put(dev->driver->module); 1912 1913 dev->use_count--; 1914 1915 mutex_unlock(&dev->mutex); 1916 1917 if (file->f_flags & FASYNC) 1918 comedi_fasync(-1, file, 0); 1919 1920 return 0; 1921} 1922 1923static int comedi_fasync(int fd, struct file *file, int on) 1924{ 1925 const unsigned minor = iminor(file->f_dentry->d_inode); 1926 struct comedi_device_file_info *dev_file_info = 1927 comedi_get_device_file_info(minor); 1928 1929 struct comedi_device *dev = dev_file_info->device; 1930 1931 return fasync_helper(fd, file, on, &dev->async_queue); 1932} 1933 1934const struct file_operations comedi_fops = { 1935 .owner = THIS_MODULE, 1936 .unlocked_ioctl = comedi_unlocked_ioctl, 1937 .compat_ioctl = comedi_compat_ioctl, 1938 .open = comedi_open, 1939 .release = comedi_close, 1940 .read = comedi_read, 1941 .write = comedi_write, 1942 .mmap = comedi_mmap, 1943 .poll = comedi_poll, 1944 .fasync = comedi_fasync, 1945 .llseek = noop_llseek, 1946}; 1947 1948struct class *comedi_class; 1949static struct cdev comedi_cdev; 1950 1951static void comedi_cleanup_legacy_minors(void) 1952{ 1953 unsigned i; 1954 1955 for (i = 0; i < comedi_num_legacy_minors; i++) 1956 comedi_free_board_minor(i); 1957} 1958 1959static int __init comedi_init(void) 1960{ 1961 int i; 1962 int retval; 1963 1964 printk(KERN_INFO "comedi: version " COMEDI_RELEASE 1965 " - http://www.comedi.org\n"); 1966 1967 if (comedi_num_legacy_minors < 0 || 1968 comedi_num_legacy_minors > COMEDI_NUM_BOARD_MINORS) { 1969 printk(KERN_ERR "comedi: error: invalid value for module " 1970 "parameter \"comedi_num_legacy_minors\". Valid values " 1971 "are 0 through %i.\n", COMEDI_NUM_BOARD_MINORS); 1972 return -EINVAL; 1973 } 1974 1975 /* 1976 * comedi is unusable if both comedi_autoconfig and 1977 * comedi_num_legacy_minors are zero, so we might as well adjust the 1978 * defaults in that case 1979 */ 1980 if (comedi_autoconfig == 0 && comedi_num_legacy_minors == 0) 1981 comedi_num_legacy_minors = 16; 1982 1983 memset(comedi_file_info_table, 0, 1984 sizeof(struct comedi_device_file_info *) * COMEDI_NUM_MINORS); 1985 1986 retval = register_chrdev_region(MKDEV(COMEDI_MAJOR, 0), 1987 COMEDI_NUM_MINORS, "comedi"); 1988 if (retval) 1989 return -EIO; 1990 cdev_init(&comedi_cdev, &comedi_fops); 1991 comedi_cdev.owner = THIS_MODULE; 1992 kobject_set_name(&comedi_cdev.kobj, "comedi"); 1993 if (cdev_add(&comedi_cdev, MKDEV(COMEDI_MAJOR, 0), COMEDI_NUM_MINORS)) { 1994 unregister_chrdev_region(MKDEV(COMEDI_MAJOR, 0), 1995 COMEDI_NUM_MINORS); 1996 return -EIO; 1997 } 1998 comedi_class = class_create(THIS_MODULE, "comedi"); 1999 if (IS_ERR(comedi_class)) { 2000 printk(KERN_ERR "comedi: failed to create class"); 2001 cdev_del(&comedi_cdev); 2002 unregister_chrdev_region(MKDEV(COMEDI_MAJOR, 0), 2003 COMEDI_NUM_MINORS); 2004 return PTR_ERR(comedi_class); 2005 } 2006 2007 /* XXX requires /proc interface */ 2008 comedi_proc_init(); 2009 2010 /* create devices files for legacy/manual use */ 2011 for (i = 0; i < comedi_num_legacy_minors; i++) { 2012 int minor; 2013 minor = comedi_alloc_board_minor(NULL); 2014 if (minor < 0) { 2015 comedi_cleanup_legacy_minors(); 2016 cdev_del(&comedi_cdev); 2017 unregister_chrdev_region(MKDEV(COMEDI_MAJOR, 0), 2018 COMEDI_NUM_MINORS); 2019 return minor; 2020 } 2021 } 2022 2023 return 0; 2024} 2025 2026static void __exit comedi_cleanup(void) 2027{ 2028 int i; 2029 2030 comedi_cleanup_legacy_minors(); 2031 for (i = 0; i < COMEDI_NUM_MINORS; ++i) 2032 BUG_ON(comedi_file_info_table[i]); 2033 2034 class_destroy(comedi_class); 2035 cdev_del(&comedi_cdev); 2036 unregister_chrdev_region(MKDEV(COMEDI_MAJOR, 0), COMEDI_NUM_MINORS); 2037 2038 comedi_proc_cleanup(); 2039} 2040 2041module_init(comedi_init); 2042module_exit(comedi_cleanup); 2043 2044void comedi_error(const struct comedi_device *dev, const char *s) 2045{ 2046 printk(KERN_ERR "comedi%d: %s: %s\n", dev->minor, 2047 dev->driver->driver_name, s); 2048} 2049EXPORT_SYMBOL(comedi_error); 2050 2051void comedi_event(struct comedi_device *dev, struct comedi_subdevice *s) 2052{ 2053 struct comedi_async *async = s->async; 2054 unsigned runflags = 0; 2055 unsigned runflags_mask = 0; 2056 2057 /* DPRINTK("comedi_event 0x%x\n",mask); */ 2058 2059 if ((comedi_get_subdevice_runflags(s) & SRF_RUNNING) == 0) 2060 return; 2061 2062 if (s-> 2063 async->events & (COMEDI_CB_EOA | COMEDI_CB_ERROR | 2064 COMEDI_CB_OVERFLOW)) { 2065 runflags_mask |= SRF_RUNNING; 2066 } 2067 /* remember if an error event has occurred, so an error 2068 * can be returned the next time the user does a read() */ 2069 if (s->async->events & (COMEDI_CB_ERROR | COMEDI_CB_OVERFLOW)) { 2070 runflags_mask |= SRF_ERROR; 2071 runflags |= SRF_ERROR; 2072 } 2073 if (runflags_mask) { 2074 /*sets SRF_ERROR and SRF_RUNNING together atomically */ 2075 comedi_set_subdevice_runflags(s, runflags_mask, runflags); 2076 } 2077 2078 if (async->cb_mask & s->async->events) { 2079 if (comedi_get_subdevice_runflags(s) & SRF_USER) { 2080 wake_up_interruptible(&async->wait_head); 2081 if (s->subdev_flags & SDF_CMD_READ) 2082 kill_fasync(&dev->async_queue, SIGIO, POLL_IN); 2083 if (s->subdev_flags & SDF_CMD_WRITE) 2084 kill_fasync(&dev->async_queue, SIGIO, POLL_OUT); 2085 } else { 2086 if (async->cb_func) 2087 async->cb_func(s->async->events, async->cb_arg); 2088 } 2089 } 2090 s->async->events = 0; 2091} 2092EXPORT_SYMBOL(comedi_event); 2093 2094unsigned comedi_get_subdevice_runflags(struct comedi_subdevice *s) 2095{ 2096 unsigned long flags; 2097 unsigned runflags; 2098 2099 spin_lock_irqsave(&s->spin_lock, flags); 2100 runflags = s->runflags; 2101 spin_unlock_irqrestore(&s->spin_lock, flags); 2102 return runflags; 2103} 2104EXPORT_SYMBOL(comedi_get_subdevice_runflags); 2105 2106static int is_device_busy(struct comedi_device *dev) 2107{ 2108 struct comedi_subdevice *s; 2109 int i; 2110 2111 if (!dev->attached) 2112 return 0; 2113 2114 for (i = 0; i < dev->n_subdevices; i++) { 2115 s = dev->subdevices + i; 2116 if (s->busy) 2117 return 1; 2118 if (s->async && s->async->mmap_count) 2119 return 1; 2120 } 2121 2122 return 0; 2123} 2124 2125static void comedi_device_init(struct comedi_device *dev) 2126{ 2127 memset(dev, 0, sizeof(struct comedi_device)); 2128 spin_lock_init(&dev->spinlock); 2129 mutex_init(&dev->mutex); 2130 dev->minor = -1; 2131} 2132 2133static void comedi_device_cleanup(struct comedi_device *dev) 2134{ 2135 if (dev == NULL) 2136 return; 2137 mutex_lock(&dev->mutex); 2138 comedi_device_detach(dev); 2139 mutex_unlock(&dev->mutex); 2140 mutex_destroy(&dev->mutex); 2141} 2142 2143int comedi_alloc_board_minor(struct device *hardware_device) 2144{ 2145 unsigned long flags; 2146 struct comedi_device_file_info *info; 2147 struct device *csdev; 2148 unsigned i; 2149 int retval; 2150 2151 info = kzalloc(sizeof(struct comedi_device_file_info), GFP_KERNEL); 2152 if (info == NULL) 2153 return -ENOMEM; 2154 info->device = kzalloc(sizeof(struct comedi_device), GFP_KERNEL); 2155 if (info->device == NULL) { 2156 kfree(info); 2157 return -ENOMEM; 2158 } 2159 comedi_device_init(info->device); 2160 spin_lock_irqsave(&comedi_file_info_table_lock, flags); 2161 for (i = 0; i < COMEDI_NUM_BOARD_MINORS; ++i) { 2162 if (comedi_file_info_table[i] == NULL) { 2163 comedi_file_info_table[i] = info; 2164 break; 2165 } 2166 } 2167 spin_unlock_irqrestore(&comedi_file_info_table_lock, flags); 2168 if (i == COMEDI_NUM_BOARD_MINORS) { 2169 comedi_device_cleanup(info->device); 2170 kfree(info->device); 2171 kfree(info); 2172 printk(KERN_ERR 2173 "comedi: error: " 2174 "ran out of minor numbers for board device files.\n"); 2175 return -EBUSY; 2176 } 2177 info->device->minor = i; 2178 csdev = COMEDI_DEVICE_CREATE(comedi_class, NULL, 2179 MKDEV(COMEDI_MAJOR, i), NULL, 2180 hardware_device, "comedi%i", i); 2181 if (!IS_ERR(csdev)) 2182 info->device->class_dev = csdev; 2183 dev_set_drvdata(csdev, info); 2184 retval = device_create_file(csdev, &dev_attr_max_read_buffer_kb); 2185 if (retval) { 2186 printk(KERN_ERR 2187 "comedi: " 2188 "failed to create sysfs attribute file \"%s\".\n", 2189 dev_attr_max_read_buffer_kb.attr.name); 2190 comedi_free_board_minor(i); 2191 return retval; 2192 } 2193 retval = device_create_file(csdev, &dev_attr_read_buffer_kb); 2194 if (retval) { 2195 printk(KERN_ERR 2196 "comedi: " 2197 "failed to create sysfs attribute file \"%s\".\n", 2198 dev_attr_read_buffer_kb.attr.name); 2199 comedi_free_board_minor(i); 2200 return retval; 2201 } 2202 retval = device_create_file(csdev, &dev_attr_max_write_buffer_kb); 2203 if (retval) { 2204 printk(KERN_ERR 2205 "comedi: " 2206 "failed to create sysfs attribute file \"%s\".\n", 2207 dev_attr_max_write_buffer_kb.attr.name); 2208 comedi_free_board_minor(i); 2209 return retval; 2210 } 2211 retval = device_create_file(csdev, &dev_attr_write_buffer_kb); 2212 if (retval) { 2213 printk(KERN_ERR 2214 "comedi: " 2215 "failed to create sysfs attribute file \"%s\".\n", 2216 dev_attr_write_buffer_kb.attr.name); 2217 comedi_free_board_minor(i); 2218 return retval; 2219 } 2220 return i; 2221} 2222 2223void comedi_free_board_minor(unsigned minor) 2224{ 2225 unsigned long flags; 2226 struct comedi_device_file_info *info; 2227 2228 BUG_ON(minor >= COMEDI_NUM_BOARD_MINORS); 2229 spin_lock_irqsave(&comedi_file_info_table_lock, flags); 2230 info = comedi_file_info_table[minor]; 2231 comedi_file_info_table[minor] = NULL; 2232 spin_unlock_irqrestore(&comedi_file_info_table_lock, flags); 2233 2234 if (info) { 2235 struct comedi_device *dev = info->device; 2236 if (dev) { 2237 if (dev->class_dev) { 2238 device_destroy(comedi_class, 2239 MKDEV(COMEDI_MAJOR, dev->minor)); 2240 } 2241 comedi_device_cleanup(dev); 2242 kfree(dev); 2243 } 2244 kfree(info); 2245 } 2246} 2247 2248int comedi_alloc_subdevice_minor(struct comedi_device *dev, 2249 struct comedi_subdevice *s) 2250{ 2251 unsigned long flags; 2252 struct comedi_device_file_info *info; 2253 struct device *csdev; 2254 unsigned i; 2255 int retval; 2256 2257 info = kmalloc(sizeof(struct comedi_device_file_info), GFP_KERNEL); 2258 if (info == NULL) 2259 return -ENOMEM; 2260 info->device = dev; 2261 info->read_subdevice = s; 2262 info->write_subdevice = s; 2263 spin_lock_irqsave(&comedi_file_info_table_lock, flags); 2264 for (i = COMEDI_FIRST_SUBDEVICE_MINOR; i < COMEDI_NUM_MINORS; ++i) { 2265 if (comedi_file_info_table[i] == NULL) { 2266 comedi_file_info_table[i] = info; 2267 break; 2268 } 2269 } 2270 spin_unlock_irqrestore(&comedi_file_info_table_lock, flags); 2271 if (i == COMEDI_NUM_MINORS) { 2272 kfree(info); 2273 printk(KERN_ERR 2274 "comedi: error: " 2275 "ran out of minor numbers for board device files.\n"); 2276 return -EBUSY; 2277 } 2278 s->minor = i; 2279 csdev = COMEDI_DEVICE_CREATE(comedi_class, dev->class_dev, 2280 MKDEV(COMEDI_MAJOR, i), NULL, NULL, 2281 "comedi%i_subd%i", dev->minor, 2282 (int)(s - dev->subdevices)); 2283 if (!IS_ERR(csdev)) 2284 s->class_dev = csdev; 2285 dev_set_drvdata(csdev, info); 2286 retval = device_create_file(csdev, &dev_attr_max_read_buffer_kb); 2287 if (retval) { 2288 printk(KERN_ERR 2289 "comedi: " 2290 "failed to create sysfs attribute file \"%s\".\n", 2291 dev_attr_max_read_buffer_kb.attr.name); 2292 comedi_free_subdevice_minor(s); 2293 return retval; 2294 } 2295 retval = device_create_file(csdev, &dev_attr_read_buffer_kb); 2296 if (retval) { 2297 printk(KERN_ERR 2298 "comedi: " 2299 "failed to create sysfs attribute file \"%s\".\n", 2300 dev_attr_read_buffer_kb.attr.name); 2301 comedi_free_subdevice_minor(s); 2302 return retval; 2303 } 2304 retval = device_create_file(csdev, &dev_attr_max_write_buffer_kb); 2305 if (retval) { 2306 printk(KERN_ERR 2307 "comedi: " 2308 "failed to create sysfs attribute file \"%s\".\n", 2309 dev_attr_max_write_buffer_kb.attr.name); 2310 comedi_free_subdevice_minor(s); 2311 return retval; 2312 } 2313 retval = device_create_file(csdev, &dev_attr_write_buffer_kb); 2314 if (retval) { 2315 printk(KERN_ERR 2316 "comedi: " 2317 "failed to create sysfs attribute file \"%s\".\n", 2318 dev_attr_write_buffer_kb.attr.name); 2319 comedi_free_subdevice_minor(s); 2320 return retval; 2321 } 2322 return i; 2323} 2324 2325void comedi_free_subdevice_minor(struct comedi_subdevice *s) 2326{ 2327 unsigned long flags; 2328 struct comedi_device_file_info *info; 2329 2330 if (s == NULL) 2331 return; 2332 if (s->minor < 0) 2333 return; 2334 2335 BUG_ON(s->minor >= COMEDI_NUM_MINORS); 2336 BUG_ON(s->minor < COMEDI_FIRST_SUBDEVICE_MINOR); 2337 2338 spin_lock_irqsave(&comedi_file_info_table_lock, flags); 2339 info = comedi_file_info_table[s->minor]; 2340 comedi_file_info_table[s->minor] = NULL; 2341 spin_unlock_irqrestore(&comedi_file_info_table_lock, flags); 2342 2343 if (s->class_dev) { 2344 device_destroy(comedi_class, MKDEV(COMEDI_MAJOR, s->minor)); 2345 s->class_dev = NULL; 2346 } 2347 kfree(info); 2348} 2349 2350struct comedi_device_file_info *comedi_get_device_file_info(unsigned minor) 2351{ 2352 unsigned long flags; 2353 struct comedi_device_file_info *info; 2354 2355 BUG_ON(minor >= COMEDI_NUM_MINORS); 2356 spin_lock_irqsave(&comedi_file_info_table_lock, flags); 2357 info = comedi_file_info_table[minor]; 2358 spin_unlock_irqrestore(&comedi_file_info_table_lock, flags); 2359 return info; 2360} 2361EXPORT_SYMBOL_GPL(comedi_get_device_file_info); 2362 2363static int resize_async_buffer(struct comedi_device *dev, 2364 struct comedi_subdevice *s, 2365 struct comedi_async *async, unsigned new_size) 2366{ 2367 int retval; 2368 2369 if (new_size > async->max_bufsize) 2370 return -EPERM; 2371 2372 if (s->busy) { 2373 DPRINTK("subdevice is busy, cannot resize buffer\n"); 2374 return -EBUSY; 2375 } 2376 if (async->mmap_count) { 2377 DPRINTK("subdevice is mmapped, cannot resize buffer\n"); 2378 return -EBUSY; 2379 } 2380 2381 if (!async->prealloc_buf) 2382 return -EINVAL; 2383 2384 /* make sure buffer is an integral number of pages 2385 * (we round up) */ 2386 new_size = (new_size + PAGE_SIZE - 1) & PAGE_MASK; 2387 2388 retval = comedi_buf_alloc(dev, s, new_size); 2389 if (retval < 0) 2390 return retval; 2391 2392 if (s->buf_change) { 2393 retval = s->buf_change(dev, s, new_size); 2394 if (retval < 0) 2395 return retval; 2396 } 2397 2398 DPRINTK("comedi%i subd %d buffer resized to %i bytes\n", 2399 dev->minor, (int)(s - dev->subdevices), async->prealloc_bufsz); 2400 return 0; 2401} 2402 2403/* sysfs attribute files */ 2404 2405static const unsigned bytes_per_kibi = 1024; 2406 2407static ssize_t show_max_read_buffer_kb(struct device *dev, 2408 struct device_attribute *attr, char *buf) 2409{ 2410 ssize_t retval; 2411 struct comedi_device_file_info *info = dev_get_drvdata(dev); 2412 unsigned max_buffer_size_kb = 0; 2413 struct comedi_subdevice *const read_subdevice = 2414 comedi_get_read_subdevice(info); 2415 2416 mutex_lock(&info->device->mutex); 2417 if (read_subdevice && 2418 (read_subdevice->subdev_flags & SDF_CMD_READ) && 2419 read_subdevice->async) { 2420 max_buffer_size_kb = read_subdevice->async->max_bufsize / 2421 bytes_per_kibi; 2422 } 2423 retval = snprintf(buf, PAGE_SIZE, "%i\n", max_buffer_size_kb); 2424 mutex_unlock(&info->device->mutex); 2425 2426 return retval; 2427} 2428 2429static ssize_t store_max_read_buffer_kb(struct device *dev, 2430 struct device_attribute *attr, 2431 const char *buf, size_t count) 2432{ 2433 struct comedi_device_file_info *info = dev_get_drvdata(dev); 2434 unsigned long new_max_size_kb; 2435 uint64_t new_max_size; 2436 struct comedi_subdevice *const read_subdevice = 2437 comedi_get_read_subdevice(info); 2438 2439 if (strict_strtoul(buf, 10, &new_max_size_kb)) 2440 return -EINVAL; 2441 if (new_max_size_kb != (uint32_t) new_max_size_kb) 2442 return -EINVAL; 2443 new_max_size = ((uint64_t) new_max_size_kb) * bytes_per_kibi; 2444 if (new_max_size != (uint32_t) new_max_size) 2445 return -EINVAL; 2446 2447 mutex_lock(&info->device->mutex); 2448 if (read_subdevice == NULL || 2449 (read_subdevice->subdev_flags & SDF_CMD_READ) == 0 || 2450 read_subdevice->async == NULL) { 2451 mutex_unlock(&info->device->mutex); 2452 return -EINVAL; 2453 } 2454 read_subdevice->async->max_bufsize = new_max_size; 2455 mutex_unlock(&info->device->mutex); 2456 2457 return count; 2458} 2459 2460static struct device_attribute dev_attr_max_read_buffer_kb = { 2461 .attr = { 2462 .name = "max_read_buffer_kb", 2463 .mode = S_IRUGO | S_IWUSR}, 2464 .show = &show_max_read_buffer_kb, 2465 .store = &store_max_read_buffer_kb 2466}; 2467 2468static ssize_t show_read_buffer_kb(struct device *dev, 2469 struct device_attribute *attr, char *buf) 2470{ 2471 ssize_t retval; 2472 struct comedi_device_file_info *info = dev_get_drvdata(dev); 2473 unsigned buffer_size_kb = 0; 2474 struct comedi_subdevice *const read_subdevice = 2475 comedi_get_read_subdevice(info); 2476 2477 mutex_lock(&info->device->mutex); 2478 if (read_subdevice && 2479 (read_subdevice->subdev_flags & SDF_CMD_READ) && 2480 read_subdevice->async) { 2481 buffer_size_kb = read_subdevice->async->prealloc_bufsz / 2482 bytes_per_kibi; 2483 } 2484 retval = snprintf(buf, PAGE_SIZE, "%i\n", buffer_size_kb); 2485 mutex_unlock(&info->device->mutex); 2486 2487 return retval; 2488} 2489 2490static ssize_t store_read_buffer_kb(struct device *dev, 2491 struct device_attribute *attr, 2492 const char *buf, size_t count) 2493{ 2494 struct comedi_device_file_info *info = dev_get_drvdata(dev); 2495 unsigned long new_size_kb; 2496 uint64_t new_size; 2497 int retval; 2498 struct comedi_subdevice *const read_subdevice = 2499 comedi_get_read_subdevice(info); 2500 2501 if (strict_strtoul(buf, 10, &new_size_kb)) 2502 return -EINVAL; 2503 if (new_size_kb != (uint32_t) new_size_kb) 2504 return -EINVAL; 2505 new_size = ((uint64_t) new_size_kb) * bytes_per_kibi; 2506 if (new_size != (uint32_t) new_size) 2507 return -EINVAL; 2508 2509 mutex_lock(&info->device->mutex); 2510 if (read_subdevice == NULL || 2511 (read_subdevice->subdev_flags & SDF_CMD_READ) == 0 || 2512 read_subdevice->async == NULL) { 2513 mutex_unlock(&info->device->mutex); 2514 return -EINVAL; 2515 } 2516 retval = resize_async_buffer(info->device, read_subdevice, 2517 read_subdevice->async, new_size); 2518 mutex_unlock(&info->device->mutex); 2519 2520 if (retval < 0) 2521 return retval; 2522 return count; 2523} 2524 2525static struct device_attribute dev_attr_read_buffer_kb = { 2526 .attr = { 2527 .name = "read_buffer_kb", 2528 .mode = S_IRUGO | S_IWUSR | S_IWGRP}, 2529 .show = &show_read_buffer_kb, 2530 .store = &store_read_buffer_kb 2531}; 2532 2533static ssize_t show_max_write_buffer_kb(struct device *dev, 2534 struct device_attribute *attr, 2535 char *buf) 2536{ 2537 ssize_t retval; 2538 struct comedi_device_file_info *info = dev_get_drvdata(dev); 2539 unsigned max_buffer_size_kb = 0; 2540 struct comedi_subdevice *const write_subdevice = 2541 comedi_get_write_subdevice(info); 2542 2543 mutex_lock(&info->device->mutex); 2544 if (write_subdevice && 2545 (write_subdevice->subdev_flags & SDF_CMD_WRITE) && 2546 write_subdevice->async) { 2547 max_buffer_size_kb = write_subdevice->async->max_bufsize / 2548 bytes_per_kibi; 2549 } 2550 retval = snprintf(buf, PAGE_SIZE, "%i\n", max_buffer_size_kb); 2551 mutex_unlock(&info->device->mutex); 2552 2553 return retval; 2554} 2555 2556static ssize_t store_max_write_buffer_kb(struct device *dev, 2557 struct device_attribute *attr, 2558 const char *buf, size_t count) 2559{ 2560 struct comedi_device_file_info *info = dev_get_drvdata(dev); 2561 unsigned long new_max_size_kb; 2562 uint64_t new_max_size; 2563 struct comedi_subdevice *const write_subdevice = 2564 comedi_get_write_subdevice(info); 2565 2566 if (strict_strtoul(buf, 10, &new_max_size_kb)) 2567 return -EINVAL; 2568 if (new_max_size_kb != (uint32_t) new_max_size_kb) 2569 return -EINVAL; 2570 new_max_size = ((uint64_t) new_max_size_kb) * bytes_per_kibi; 2571 if (new_max_size != (uint32_t) new_max_size) 2572 return -EINVAL; 2573 2574 mutex_lock(&info->device->mutex); 2575 if (write_subdevice == NULL || 2576 (write_subdevice->subdev_flags & SDF_CMD_WRITE) == 0 || 2577 write_subdevice->async == NULL) { 2578 mutex_unlock(&info->device->mutex); 2579 return -EINVAL; 2580 } 2581 write_subdevice->async->max_bufsize = new_max_size; 2582 mutex_unlock(&info->device->mutex); 2583 2584 return count; 2585} 2586 2587static struct device_attribute dev_attr_max_write_buffer_kb = { 2588 .attr = { 2589 .name = "max_write_buffer_kb", 2590 .mode = S_IRUGO | S_IWUSR}, 2591 .show = &show_max_write_buffer_kb, 2592 .store = &store_max_write_buffer_kb 2593}; 2594 2595static ssize_t show_write_buffer_kb(struct device *dev, 2596 struct device_attribute *attr, char *buf) 2597{ 2598 ssize_t retval; 2599 struct comedi_device_file_info *info = dev_get_drvdata(dev); 2600 unsigned buffer_size_kb = 0; 2601 struct comedi_subdevice *const write_subdevice = 2602 comedi_get_write_subdevice(info); 2603 2604 mutex_lock(&info->device->mutex); 2605 if (write_subdevice && 2606 (write_subdevice->subdev_flags & SDF_CMD_WRITE) && 2607 write_subdevice->async) { 2608 buffer_size_kb = write_subdevice->async->prealloc_bufsz / 2609 bytes_per_kibi; 2610 } 2611 retval = snprintf(buf, PAGE_SIZE, "%i\n", buffer_size_kb); 2612 mutex_unlock(&info->device->mutex); 2613 2614 return retval; 2615} 2616 2617static ssize_t store_write_buffer_kb(struct device *dev, 2618 struct device_attribute *attr, 2619 const char *buf, size_t count) 2620{ 2621 struct comedi_device_file_info *info = dev_get_drvdata(dev); 2622 unsigned long new_size_kb; 2623 uint64_t new_size; 2624 int retval; 2625 struct comedi_subdevice *const write_subdevice = 2626 comedi_get_write_subdevice(info); 2627 2628 if (strict_strtoul(buf, 10, &new_size_kb)) 2629 return -EINVAL; 2630 if (new_size_kb != (uint32_t) new_size_kb) 2631 return -EINVAL; 2632 new_size = ((uint64_t) new_size_kb) * bytes_per_kibi; 2633 if (new_size != (uint32_t) new_size) 2634 return -EINVAL; 2635 2636 mutex_lock(&info->device->mutex); 2637 if (write_subdevice == NULL || 2638 (write_subdevice->subdev_flags & SDF_CMD_WRITE) == 0 || 2639 write_subdevice->async == NULL) { 2640 mutex_unlock(&info->device->mutex); 2641 return -EINVAL; 2642 } 2643 retval = resize_async_buffer(info->device, write_subdevice, 2644 write_subdevice->async, new_size); 2645 mutex_unlock(&info->device->mutex); 2646 2647 if (retval < 0) 2648 return retval; 2649 return count; 2650} 2651 2652static struct device_attribute dev_attr_write_buffer_kb = { 2653 .attr = { 2654 .name = "write_buffer_kb", 2655 .mode = S_IRUGO | S_IWUSR | S_IWGRP}, 2656 .show = &show_write_buffer_kb, 2657 .store = &store_write_buffer_kb 2658}; 2659