comedi_fops.c revision 4772c018e35b6a21e8a8bde54568b59998540a16
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); 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 break; 174 case COMEDI_LOCK: 175 rc = do_lock_ioctl(dev, arg, file); 176 break; 177 case COMEDI_UNLOCK: 178 rc = do_unlock_ioctl(dev, arg, file); 179 break; 180 case COMEDI_CANCEL: 181 rc = do_cancel_ioctl(dev, arg, file); 182 break; 183 case COMEDI_CMD: 184 rc = do_cmd_ioctl(dev, (struct comedi_cmd __user *)arg, file); 185 break; 186 case COMEDI_CMDTEST: 187 rc = do_cmdtest_ioctl(dev, (struct comedi_cmd __user *)arg, 188 file); 189 break; 190 case COMEDI_INSNLIST: 191 rc = do_insnlist_ioctl(dev, 192 (struct comedi_insnlist __user *)arg, 193 file); 194 break; 195 case COMEDI_INSN: 196 rc = do_insn_ioctl(dev, (struct comedi_insn __user *)arg, 197 file); 198 break; 199 case COMEDI_POLL: 200 rc = do_poll_ioctl(dev, arg, file); 201 break; 202 default: 203 rc = -ENOTTY; 204 break; 205 } 206 207done: 208 mutex_unlock(&dev->mutex); 209 return rc; 210} 211 212/* 213 COMEDI_DEVCONFIG 214 device config ioctl 215 216 arg: 217 pointer to devconfig structure 218 219 reads: 220 devconfig structure at arg 221 222 writes: 223 none 224*/ 225static int do_devconfig_ioctl(struct comedi_device *dev, 226 struct comedi_devconfig __user *arg) 227{ 228 struct comedi_devconfig it; 229 int ret; 230 unsigned char *aux_data = NULL; 231 int aux_len; 232 233 if (!capable(CAP_SYS_ADMIN)) 234 return -EPERM; 235 236 if (arg == NULL) { 237 if (is_device_busy(dev)) 238 return -EBUSY; 239 if (dev->attached) { 240 struct module *driver_module = dev->driver->module; 241 comedi_device_detach(dev); 242 module_put(driver_module); 243 } 244 return 0; 245 } 246 247 if (copy_from_user(&it, arg, sizeof(struct comedi_devconfig))) 248 return -EFAULT; 249 250 it.board_name[COMEDI_NAMELEN - 1] = 0; 251 252 if (comedi_aux_data(it.options, 0) && 253 it.options[COMEDI_DEVCONF_AUX_DATA_LENGTH]) { 254 int bit_shift; 255 aux_len = it.options[COMEDI_DEVCONF_AUX_DATA_LENGTH]; 256 if (aux_len < 0) 257 return -EFAULT; 258 259 aux_data = vmalloc(aux_len); 260 if (!aux_data) 261 return -ENOMEM; 262 263 if (copy_from_user(aux_data, 264 comedi_aux_data(it.options, 0), aux_len)) { 265 vfree(aux_data); 266 return -EFAULT; 267 } 268 it.options[COMEDI_DEVCONF_AUX_DATA_LO] = 269 (unsigned long)aux_data; 270 if (sizeof(void *) > sizeof(int)) { 271 bit_shift = sizeof(int) * 8; 272 it.options[COMEDI_DEVCONF_AUX_DATA_HI] = 273 ((unsigned long)aux_data) >> bit_shift; 274 } else 275 it.options[COMEDI_DEVCONF_AUX_DATA_HI] = 0; 276 } 277 278 ret = comedi_device_attach(dev, &it); 279 if (ret == 0) { 280 if (!try_module_get(dev->driver->module)) { 281 comedi_device_detach(dev); 282 return -ENOSYS; 283 } 284 } 285 286 if (aux_data) 287 vfree(aux_data); 288 289 return ret; 290} 291 292/* 293 COMEDI_BUFCONFIG 294 buffer configuration ioctl 295 296 arg: 297 pointer to bufconfig structure 298 299 reads: 300 bufconfig at arg 301 302 writes: 303 modified bufconfig at arg 304 305*/ 306static int do_bufconfig_ioctl(struct comedi_device *dev, 307 struct comedi_bufconfig __user *arg) 308{ 309 struct comedi_bufconfig bc; 310 struct comedi_async *async; 311 struct comedi_subdevice *s; 312 int retval = 0; 313 314 if (copy_from_user(&bc, arg, sizeof(struct comedi_bufconfig))) 315 return -EFAULT; 316 317 if (bc.subdevice >= dev->n_subdevices || bc.subdevice < 0) 318 return -EINVAL; 319 320 s = dev->subdevices + bc.subdevice; 321 async = s->async; 322 323 if (!async) { 324 DPRINTK("subdevice does not have async capability\n"); 325 bc.size = 0; 326 bc.maximum_size = 0; 327 goto copyback; 328 } 329 330 if (bc.maximum_size) { 331 if (!capable(CAP_SYS_ADMIN)) 332 return -EPERM; 333 334 async->max_bufsize = bc.maximum_size; 335 } 336 337 if (bc.size) { 338 retval = resize_async_buffer(dev, s, async, bc.size); 339 if (retval < 0) 340 return retval; 341 } 342 343 bc.size = async->prealloc_bufsz; 344 bc.maximum_size = async->max_bufsize; 345 346copyback: 347 if (copy_to_user(arg, &bc, sizeof(struct comedi_bufconfig))) 348 return -EFAULT; 349 350 return 0; 351} 352 353/* 354 COMEDI_DEVINFO 355 device info ioctl 356 357 arg: 358 pointer to devinfo structure 359 360 reads: 361 none 362 363 writes: 364 devinfo structure 365 366*/ 367static int do_devinfo_ioctl(struct comedi_device *dev, 368 struct comedi_devinfo __user *arg, 369 struct file *file) 370{ 371 struct comedi_devinfo devinfo; 372 const unsigned minor = iminor(file->f_dentry->d_inode); 373 struct comedi_device_file_info *dev_file_info = 374 comedi_get_device_file_info(minor); 375 struct comedi_subdevice *read_subdev = 376 comedi_get_read_subdevice(dev_file_info); 377 struct comedi_subdevice *write_subdev = 378 comedi_get_write_subdevice(dev_file_info); 379 380 memset(&devinfo, 0, sizeof(devinfo)); 381 382 /* fill devinfo structure */ 383 devinfo.version_code = COMEDI_VERSION_CODE; 384 devinfo.n_subdevs = dev->n_subdevices; 385 memcpy(devinfo.driver_name, dev->driver->driver_name, COMEDI_NAMELEN); 386 memcpy(devinfo.board_name, dev->board_name, COMEDI_NAMELEN); 387 388 if (read_subdev) 389 devinfo.read_subdevice = read_subdev - dev->subdevices; 390 else 391 devinfo.read_subdevice = -1; 392 393 if (write_subdev) 394 devinfo.write_subdevice = write_subdev - dev->subdevices; 395 else 396 devinfo.write_subdevice = -1; 397 398 if (copy_to_user(arg, &devinfo, sizeof(struct comedi_devinfo))) 399 return -EFAULT; 400 401 return 0; 402} 403 404/* 405 COMEDI_SUBDINFO 406 subdevice info ioctl 407 408 arg: 409 pointer to array of subdevice info structures 410 411 reads: 412 none 413 414 writes: 415 array of subdevice info structures at arg 416 417*/ 418static int do_subdinfo_ioctl(struct comedi_device *dev, 419 struct comedi_subdinfo __user *arg, void *file) 420{ 421 int ret, i; 422 struct comedi_subdinfo *tmp, *us; 423 struct comedi_subdevice *s; 424 425 tmp = 426 kcalloc(dev->n_subdevices, sizeof(struct comedi_subdinfo), 427 GFP_KERNEL); 428 if (!tmp) 429 return -ENOMEM; 430 431 /* fill subdinfo structs */ 432 for (i = 0; i < dev->n_subdevices; i++) { 433 s = dev->subdevices + i; 434 us = tmp + i; 435 436 us->type = s->type; 437 us->n_chan = s->n_chan; 438 us->subd_flags = s->subdev_flags; 439 if (comedi_get_subdevice_runflags(s) & SRF_RUNNING) 440 us->subd_flags |= SDF_RUNNING; 441#define TIMER_nanosec 5 /* backwards compatibility */ 442 us->timer_type = TIMER_nanosec; 443 us->len_chanlist = s->len_chanlist; 444 us->maxdata = s->maxdata; 445 if (s->range_table) { 446 us->range_type = 447 (i << 24) | (0 << 16) | (s->range_table->length); 448 } else { 449 us->range_type = 0; /* XXX */ 450 } 451 us->flags = s->flags; 452 453 if (s->busy) 454 us->subd_flags |= SDF_BUSY; 455 if (s->busy == file) 456 us->subd_flags |= SDF_BUSY_OWNER; 457 if (s->lock) 458 us->subd_flags |= SDF_LOCKED; 459 if (s->lock == file) 460 us->subd_flags |= SDF_LOCK_OWNER; 461 if (!s->maxdata && s->maxdata_list) 462 us->subd_flags |= SDF_MAXDATA; 463 if (s->flaglist) 464 us->subd_flags |= SDF_FLAGS; 465 if (s->range_table_list) 466 us->subd_flags |= SDF_RANGETYPE; 467 if (s->do_cmd) 468 us->subd_flags |= SDF_CMD; 469 470 if (s->insn_bits != &insn_inval) 471 us->insn_bits_support = COMEDI_SUPPORTED; 472 else 473 us->insn_bits_support = COMEDI_UNSUPPORTED; 474 475 us->settling_time_0 = s->settling_time_0; 476 } 477 478 ret = copy_to_user(arg, tmp, 479 dev->n_subdevices * sizeof(struct comedi_subdinfo)); 480 481 kfree(tmp); 482 483 return ret ? -EFAULT : 0; 484} 485 486/* 487 COMEDI_CHANINFO 488 subdevice info ioctl 489 490 arg: 491 pointer to chaninfo structure 492 493 reads: 494 chaninfo structure at arg 495 496 writes: 497 arrays at elements of chaninfo structure 498 499*/ 500static int do_chaninfo_ioctl(struct comedi_device *dev, 501 struct comedi_chaninfo __user *arg) 502{ 503 struct comedi_subdevice *s; 504 struct comedi_chaninfo it; 505 506 if (copy_from_user(&it, arg, sizeof(struct comedi_chaninfo))) 507 return -EFAULT; 508 509 if (it.subdev >= dev->n_subdevices) 510 return -EINVAL; 511 s = dev->subdevices + it.subdev; 512 513 if (it.maxdata_list) { 514 if (s->maxdata || !s->maxdata_list) 515 return -EINVAL; 516 if (copy_to_user(it.maxdata_list, s->maxdata_list, 517 s->n_chan * sizeof(unsigned int))) 518 return -EFAULT; 519 } 520 521 if (it.flaglist) { 522 if (!s->flaglist) 523 return -EINVAL; 524 if (copy_to_user(it.flaglist, s->flaglist, 525 s->n_chan * sizeof(unsigned int))) 526 return -EFAULT; 527 } 528 529 if (it.rangelist) { 530 int i; 531 532 if (!s->range_table_list) 533 return -EINVAL; 534 for (i = 0; i < s->n_chan; i++) { 535 int x; 536 537 x = (dev->minor << 28) | (it.subdev << 24) | (i << 16) | 538 (s->range_table_list[i]->length); 539 put_user(x, it.rangelist + i); 540 } 541#if 0 542 if (copy_to_user(it.rangelist, s->range_type_list, 543 s->n_chan * sizeof(unsigned int))) 544 return -EFAULT; 545#endif 546 } 547 548 return 0; 549} 550 551 /* 552 COMEDI_BUFINFO 553 buffer information ioctl 554 555 arg: 556 pointer to bufinfo structure 557 558 reads: 559 bufinfo at arg 560 561 writes: 562 modified bufinfo at arg 563 564 */ 565static int do_bufinfo_ioctl(struct comedi_device *dev, 566 struct comedi_bufinfo __user *arg) 567{ 568 struct comedi_bufinfo bi; 569 struct comedi_subdevice *s; 570 struct comedi_async *async; 571 572 if (copy_from_user(&bi, arg, sizeof(struct comedi_bufinfo))) 573 return -EFAULT; 574 575 if (bi.subdevice >= dev->n_subdevices || bi.subdevice < 0) 576 return -EINVAL; 577 578 s = dev->subdevices + bi.subdevice; 579 async = s->async; 580 581 if (!async) { 582 DPRINTK("subdevice does not have async capability\n"); 583 bi.buf_write_ptr = 0; 584 bi.buf_read_ptr = 0; 585 bi.buf_write_count = 0; 586 bi.buf_read_count = 0; 587 bi.bytes_read = 0; 588 bi.bytes_written = 0; 589 goto copyback; 590 } 591 592 if (bi.bytes_read && (s->subdev_flags & SDF_CMD_READ)) { 593 bi.bytes_read = comedi_buf_read_alloc(async, bi.bytes_read); 594 comedi_buf_read_free(async, bi.bytes_read); 595 596 if (!(comedi_get_subdevice_runflags(s) & (SRF_ERROR | 597 SRF_RUNNING)) 598 && async->buf_write_count == async->buf_read_count) { 599 do_become_nonbusy(dev, s); 600 } 601 } 602 603 if (bi.bytes_written && (s->subdev_flags & SDF_CMD_WRITE)) { 604 bi.bytes_written = 605 comedi_buf_write_alloc(async, bi.bytes_written); 606 comedi_buf_write_free(async, bi.bytes_written); 607 } 608 609 bi.buf_write_count = async->buf_write_count; 610 bi.buf_write_ptr = async->buf_write_ptr; 611 bi.buf_read_count = async->buf_read_count; 612 bi.buf_read_ptr = async->buf_read_ptr; 613 614copyback: 615 if (copy_to_user(arg, &bi, sizeof(struct comedi_bufinfo))) 616 return -EFAULT; 617 618 return 0; 619} 620 621static int parse_insn(struct comedi_device *dev, struct comedi_insn *insn, 622 unsigned int *data, void *file); 623/* 624 * COMEDI_INSNLIST 625 * synchronous instructions 626 * 627 * arg: 628 * pointer to sync cmd structure 629 * 630 * reads: 631 * sync cmd struct at arg 632 * instruction list 633 * data (for writes) 634 * 635 * writes: 636 * data (for reads) 637 */ 638/* arbitrary limits */ 639#define MAX_SAMPLES 256 640static int do_insnlist_ioctl(struct comedi_device *dev, 641 struct comedi_insnlist __user *arg, void *file) 642{ 643 struct comedi_insnlist insnlist; 644 struct comedi_insn *insns = NULL; 645 unsigned int *data = NULL; 646 int i = 0; 647 int ret = 0; 648 649 if (copy_from_user(&insnlist, arg, sizeof(struct comedi_insnlist))) 650 return -EFAULT; 651 652 data = kmalloc(sizeof(unsigned int) * MAX_SAMPLES, GFP_KERNEL); 653 if (!data) { 654 DPRINTK("kmalloc failed\n"); 655 ret = -ENOMEM; 656 goto error; 657 } 658 659 insns = 660 kmalloc(sizeof(struct comedi_insn) * insnlist.n_insns, GFP_KERNEL); 661 if (!insns) { 662 DPRINTK("kmalloc failed\n"); 663 ret = -ENOMEM; 664 goto error; 665 } 666 667 if (copy_from_user(insns, insnlist.insns, 668 sizeof(struct comedi_insn) * insnlist.n_insns)) { 669 DPRINTK("copy_from_user failed\n"); 670 ret = -EFAULT; 671 goto error; 672 } 673 674 for (i = 0; i < insnlist.n_insns; i++) { 675 if (insns[i].n > MAX_SAMPLES) { 676 DPRINTK("number of samples too large\n"); 677 ret = -EINVAL; 678 goto error; 679 } 680 if (insns[i].insn & INSN_MASK_WRITE) { 681 if (copy_from_user(data, insns[i].data, 682 insns[i].n * sizeof(unsigned int))) { 683 DPRINTK("copy_from_user failed\n"); 684 ret = -EFAULT; 685 goto error; 686 } 687 } 688 ret = parse_insn(dev, insns + i, data, file); 689 if (ret < 0) 690 goto error; 691 if (insns[i].insn & INSN_MASK_READ) { 692 if (copy_to_user(insns[i].data, data, 693 insns[i].n * sizeof(unsigned int))) { 694 DPRINTK("copy_to_user failed\n"); 695 ret = -EFAULT; 696 goto error; 697 } 698 } 699 if (need_resched()) 700 schedule(); 701 } 702 703error: 704 kfree(insns); 705 kfree(data); 706 707 if (ret < 0) 708 return ret; 709 return i; 710} 711 712static int check_insn_config_length(struct comedi_insn *insn, 713 unsigned int *data) 714{ 715 if (insn->n < 1) 716 return -EINVAL; 717 718 switch (data[0]) { 719 case INSN_CONFIG_DIO_OUTPUT: 720 case INSN_CONFIG_DIO_INPUT: 721 case INSN_CONFIG_DISARM: 722 case INSN_CONFIG_RESET: 723 if (insn->n == 1) 724 return 0; 725 break; 726 case INSN_CONFIG_ARM: 727 case INSN_CONFIG_DIO_QUERY: 728 case INSN_CONFIG_BLOCK_SIZE: 729 case INSN_CONFIG_FILTER: 730 case INSN_CONFIG_SERIAL_CLOCK: 731 case INSN_CONFIG_BIDIRECTIONAL_DATA: 732 case INSN_CONFIG_ALT_SOURCE: 733 case INSN_CONFIG_SET_COUNTER_MODE: 734 case INSN_CONFIG_8254_READ_STATUS: 735 case INSN_CONFIG_SET_ROUTING: 736 case INSN_CONFIG_GET_ROUTING: 737 case INSN_CONFIG_GET_PWM_STATUS: 738 case INSN_CONFIG_PWM_SET_PERIOD: 739 case INSN_CONFIG_PWM_GET_PERIOD: 740 if (insn->n == 2) 741 return 0; 742 break; 743 case INSN_CONFIG_SET_GATE_SRC: 744 case INSN_CONFIG_GET_GATE_SRC: 745 case INSN_CONFIG_SET_CLOCK_SRC: 746 case INSN_CONFIG_GET_CLOCK_SRC: 747 case INSN_CONFIG_SET_OTHER_SRC: 748 case INSN_CONFIG_GET_COUNTER_STATUS: 749 case INSN_CONFIG_PWM_SET_H_BRIDGE: 750 case INSN_CONFIG_PWM_GET_H_BRIDGE: 751 case INSN_CONFIG_GET_HARDWARE_BUFFER_SIZE: 752 if (insn->n == 3) 753 return 0; 754 break; 755 case INSN_CONFIG_PWM_OUTPUT: 756 case INSN_CONFIG_ANALOG_TRIG: 757 if (insn->n == 5) 758 return 0; 759 break; 760 /* by default we allow the insn since we don't have checks for 761 * all possible cases yet */ 762 default: 763 printk(KERN_WARNING 764 "comedi: no check for data length of config insn id " 765 "%i is implemented.\n" 766 " Add a check to %s in %s.\n" 767 " Assuming n=%i is correct.\n", data[0], __func__, 768 __FILE__, insn->n); 769 return 0; 770 break; 771 } 772 return -EINVAL; 773} 774 775static int parse_insn(struct comedi_device *dev, struct comedi_insn *insn, 776 unsigned int *data, void *file) 777{ 778 struct comedi_subdevice *s; 779 int ret = 0; 780 int i; 781 782 if (insn->insn & INSN_MASK_SPECIAL) { 783 /* a non-subdevice instruction */ 784 785 switch (insn->insn) { 786 case INSN_GTOD: 787 { 788 struct timeval tv; 789 790 if (insn->n != 2) { 791 ret = -EINVAL; 792 break; 793 } 794 795 do_gettimeofday(&tv); 796 data[0] = tv.tv_sec; 797 data[1] = tv.tv_usec; 798 ret = 2; 799 800 break; 801 } 802 case INSN_WAIT: 803 if (insn->n != 1 || data[0] >= 100000) { 804 ret = -EINVAL; 805 break; 806 } 807 udelay(data[0] / 1000); 808 ret = 1; 809 break; 810 case INSN_INTTRIG: 811 if (insn->n != 1) { 812 ret = -EINVAL; 813 break; 814 } 815 if (insn->subdev >= dev->n_subdevices) { 816 DPRINTK("%d not usable subdevice\n", 817 insn->subdev); 818 ret = -EINVAL; 819 break; 820 } 821 s = dev->subdevices + insn->subdev; 822 if (!s->async) { 823 DPRINTK("no async\n"); 824 ret = -EINVAL; 825 break; 826 } 827 if (!s->async->inttrig) { 828 DPRINTK("no inttrig\n"); 829 ret = -EAGAIN; 830 break; 831 } 832 ret = s->async->inttrig(dev, s, insn->data[0]); 833 if (ret >= 0) 834 ret = 1; 835 break; 836 default: 837 DPRINTK("invalid insn\n"); 838 ret = -EINVAL; 839 break; 840 } 841 } else { 842 /* a subdevice instruction */ 843 unsigned int maxdata; 844 845 if (insn->subdev >= dev->n_subdevices) { 846 DPRINTK("subdevice %d out of range\n", insn->subdev); 847 ret = -EINVAL; 848 goto out; 849 } 850 s = dev->subdevices + insn->subdev; 851 852 if (s->type == COMEDI_SUBD_UNUSED) { 853 DPRINTK("%d not usable subdevice\n", insn->subdev); 854 ret = -EIO; 855 goto out; 856 } 857 858 /* are we locked? (ioctl lock) */ 859 if (s->lock && s->lock != file) { 860 DPRINTK("device locked\n"); 861 ret = -EACCES; 862 goto out; 863 } 864 865 ret = comedi_check_chanlist(s, 1, &insn->chanspec); 866 if (ret < 0) { 867 ret = -EINVAL; 868 DPRINTK("bad chanspec\n"); 869 goto out; 870 } 871 872 if (s->busy) { 873 ret = -EBUSY; 874 goto out; 875 } 876 /* This looks arbitrary. It is. */ 877 s->busy = &parse_insn; 878 switch (insn->insn) { 879 case INSN_READ: 880 ret = s->insn_read(dev, s, insn, data); 881 break; 882 case INSN_WRITE: 883 maxdata = s->maxdata_list 884 ? s->maxdata_list[CR_CHAN(insn->chanspec)] 885 : s->maxdata; 886 for (i = 0; i < insn->n; ++i) { 887 if (data[i] > maxdata) { 888 ret = -EINVAL; 889 DPRINTK("bad data value(s)\n"); 890 break; 891 } 892 } 893 if (ret == 0) 894 ret = s->insn_write(dev, s, insn, data); 895 break; 896 case INSN_BITS: 897 if (insn->n != 2) { 898 ret = -EINVAL; 899 break; 900 } 901 ret = s->insn_bits(dev, s, insn, data); 902 break; 903 case INSN_CONFIG: 904 ret = check_insn_config_length(insn, data); 905 if (ret) 906 break; 907 ret = s->insn_config(dev, s, insn, data); 908 break; 909 default: 910 ret = -EINVAL; 911 break; 912 } 913 914 s->busy = NULL; 915 } 916 917out: 918 return ret; 919} 920 921/* 922 * COMEDI_INSN 923 * synchronous instructions 924 * 925 * arg: 926 * pointer to insn 927 * 928 * reads: 929 * struct comedi_insn struct at arg 930 * data (for writes) 931 * 932 * writes: 933 * data (for reads) 934 */ 935static int do_insn_ioctl(struct comedi_device *dev, 936 struct comedi_insn __user *arg, void *file) 937{ 938 struct comedi_insn insn; 939 unsigned int *data = NULL; 940 int ret = 0; 941 942 data = kmalloc(sizeof(unsigned int) * MAX_SAMPLES, GFP_KERNEL); 943 if (!data) { 944 ret = -ENOMEM; 945 goto error; 946 } 947 948 if (copy_from_user(&insn, arg, sizeof(struct comedi_insn))) { 949 ret = -EFAULT; 950 goto error; 951 } 952 953 /* This is where the behavior of insn and insnlist deviate. */ 954 if (insn.n > MAX_SAMPLES) 955 insn.n = MAX_SAMPLES; 956 if (insn.insn & INSN_MASK_WRITE) { 957 if (copy_from_user(data, 958 insn.data, 959 insn.n * sizeof(unsigned int))) { 960 ret = -EFAULT; 961 goto error; 962 } 963 } 964 ret = parse_insn(dev, &insn, data, file); 965 if (ret < 0) 966 goto error; 967 if (insn.insn & INSN_MASK_READ) { 968 if (copy_to_user(insn.data, 969 data, 970 insn.n * sizeof(unsigned int))) { 971 ret = -EFAULT; 972 goto error; 973 } 974 } 975 ret = insn.n; 976 977error: 978 kfree(data); 979 980 return ret; 981} 982 983static void comedi_set_subdevice_runflags(struct comedi_subdevice *s, 984 unsigned mask, unsigned bits) 985{ 986 unsigned long flags; 987 988 spin_lock_irqsave(&s->spin_lock, flags); 989 s->runflags &= ~mask; 990 s->runflags |= (bits & mask); 991 spin_unlock_irqrestore(&s->spin_lock, flags); 992} 993 994static int do_cmd_ioctl(struct comedi_device *dev, 995 struct comedi_cmd __user *cmd, void *file) 996{ 997 struct comedi_cmd user_cmd; 998 struct comedi_subdevice *s; 999 struct comedi_async *async; 1000 int ret = 0; 1001 unsigned int __user *chanlist_saver = NULL; 1002 1003 if (copy_from_user(&user_cmd, cmd, sizeof(struct comedi_cmd))) { 1004 DPRINTK("bad cmd address\n"); 1005 return -EFAULT; 1006 } 1007 /* save user's chanlist pointer so it can be restored later */ 1008 chanlist_saver = user_cmd.chanlist; 1009 1010 if (user_cmd.subdev >= dev->n_subdevices) { 1011 DPRINTK("%d no such subdevice\n", user_cmd.subdev); 1012 return -ENODEV; 1013 } 1014 1015 s = dev->subdevices + user_cmd.subdev; 1016 async = s->async; 1017 1018 if (s->type == COMEDI_SUBD_UNUSED) { 1019 DPRINTK("%d not valid subdevice\n", user_cmd.subdev); 1020 return -EIO; 1021 } 1022 1023 if (!s->do_cmd || !s->do_cmdtest || !s->async) { 1024 DPRINTK("subdevice %i does not support commands\n", 1025 user_cmd.subdev); 1026 return -EIO; 1027 } 1028 1029 /* are we locked? (ioctl lock) */ 1030 if (s->lock && s->lock != file) { 1031 DPRINTK("subdevice locked\n"); 1032 return -EACCES; 1033 } 1034 1035 /* are we busy? */ 1036 if (s->busy) { 1037 DPRINTK("subdevice busy\n"); 1038 return -EBUSY; 1039 } 1040 s->busy = file; 1041 1042 /* make sure channel/gain list isn't too long */ 1043 if (user_cmd.chanlist_len > s->len_chanlist) { 1044 DPRINTK("channel/gain list too long %u > %d\n", 1045 user_cmd.chanlist_len, s->len_chanlist); 1046 ret = -EINVAL; 1047 goto cleanup; 1048 } 1049 1050 /* make sure channel/gain list isn't too short */ 1051 if (user_cmd.chanlist_len < 1) { 1052 DPRINTK("channel/gain list too short %u < 1\n", 1053 user_cmd.chanlist_len); 1054 ret = -EINVAL; 1055 goto cleanup; 1056 } 1057 1058 kfree(async->cmd.chanlist); 1059 async->cmd = user_cmd; 1060 async->cmd.data = NULL; 1061 /* load channel/gain list */ 1062 async->cmd.chanlist = 1063 kmalloc(async->cmd.chanlist_len * sizeof(int), GFP_KERNEL); 1064 if (!async->cmd.chanlist) { 1065 DPRINTK("allocation failed\n"); 1066 ret = -ENOMEM; 1067 goto cleanup; 1068 } 1069 1070 if (copy_from_user(async->cmd.chanlist, user_cmd.chanlist, 1071 async->cmd.chanlist_len * sizeof(int))) { 1072 DPRINTK("fault reading chanlist\n"); 1073 ret = -EFAULT; 1074 goto cleanup; 1075 } 1076 1077 /* make sure each element in channel/gain list is valid */ 1078 ret = comedi_check_chanlist(s, 1079 async->cmd.chanlist_len, 1080 async->cmd.chanlist); 1081 if (ret < 0) { 1082 DPRINTK("bad chanlist\n"); 1083 goto cleanup; 1084 } 1085 1086 ret = s->do_cmdtest(dev, s, &async->cmd); 1087 1088 if (async->cmd.flags & TRIG_BOGUS || ret) { 1089 DPRINTK("test returned %d\n", ret); 1090 user_cmd = async->cmd; 1091 /* restore chanlist pointer before copying back */ 1092 user_cmd.chanlist = chanlist_saver; 1093 user_cmd.data = NULL; 1094 if (copy_to_user(cmd, &user_cmd, sizeof(struct comedi_cmd))) { 1095 DPRINTK("fault writing cmd\n"); 1096 ret = -EFAULT; 1097 goto cleanup; 1098 } 1099 ret = -EAGAIN; 1100 goto cleanup; 1101 } 1102 1103 if (!async->prealloc_bufsz) { 1104 ret = -ENOMEM; 1105 DPRINTK("no buffer (?)\n"); 1106 goto cleanup; 1107 } 1108 1109 comedi_reset_async_buf(async); 1110 1111 async->cb_mask = 1112 COMEDI_CB_EOA | COMEDI_CB_BLOCK | COMEDI_CB_ERROR | 1113 COMEDI_CB_OVERFLOW; 1114 if (async->cmd.flags & TRIG_WAKE_EOS) 1115 async->cb_mask |= COMEDI_CB_EOS; 1116 1117 comedi_set_subdevice_runflags(s, ~0, SRF_USER | SRF_RUNNING); 1118 1119 ret = s->do_cmd(dev, s); 1120 if (ret == 0) 1121 return 0; 1122 1123cleanup: 1124 do_become_nonbusy(dev, s); 1125 1126 return ret; 1127} 1128 1129/* 1130 COMEDI_CMDTEST 1131 command testing ioctl 1132 1133 arg: 1134 pointer to cmd structure 1135 1136 reads: 1137 cmd structure at arg 1138 channel/range list 1139 1140 writes: 1141 modified cmd structure at arg 1142 1143*/ 1144static int do_cmdtest_ioctl(struct comedi_device *dev, 1145 struct comedi_cmd __user *arg, void *file) 1146{ 1147 struct comedi_cmd user_cmd; 1148 struct comedi_subdevice *s; 1149 int ret = 0; 1150 unsigned int *chanlist = NULL; 1151 unsigned int __user *chanlist_saver = NULL; 1152 1153 if (copy_from_user(&user_cmd, arg, sizeof(struct comedi_cmd))) { 1154 DPRINTK("bad cmd address\n"); 1155 return -EFAULT; 1156 } 1157 /* save user's chanlist pointer so it can be restored later */ 1158 chanlist_saver = user_cmd.chanlist; 1159 1160 if (user_cmd.subdev >= dev->n_subdevices) { 1161 DPRINTK("%d no such subdevice\n", user_cmd.subdev); 1162 return -ENODEV; 1163 } 1164 1165 s = dev->subdevices + user_cmd.subdev; 1166 if (s->type == COMEDI_SUBD_UNUSED) { 1167 DPRINTK("%d not valid subdevice\n", user_cmd.subdev); 1168 return -EIO; 1169 } 1170 1171 if (!s->do_cmd || !s->do_cmdtest) { 1172 DPRINTK("subdevice %i does not support commands\n", 1173 user_cmd.subdev); 1174 return -EIO; 1175 } 1176 1177 /* make sure channel/gain list isn't too long */ 1178 if (user_cmd.chanlist_len > s->len_chanlist) { 1179 DPRINTK("channel/gain list too long %d > %d\n", 1180 user_cmd.chanlist_len, s->len_chanlist); 1181 ret = -EINVAL; 1182 goto cleanup; 1183 } 1184 1185 /* load channel/gain list */ 1186 if (user_cmd.chanlist) { 1187 chanlist = 1188 kmalloc(user_cmd.chanlist_len * sizeof(int), GFP_KERNEL); 1189 if (!chanlist) { 1190 DPRINTK("allocation failed\n"); 1191 ret = -ENOMEM; 1192 goto cleanup; 1193 } 1194 1195 if (copy_from_user(chanlist, user_cmd.chanlist, 1196 user_cmd.chanlist_len * sizeof(int))) { 1197 DPRINTK("fault reading chanlist\n"); 1198 ret = -EFAULT; 1199 goto cleanup; 1200 } 1201 1202 /* make sure each element in channel/gain list is valid */ 1203 ret = comedi_check_chanlist(s, user_cmd.chanlist_len, chanlist); 1204 if (ret < 0) { 1205 DPRINTK("bad chanlist\n"); 1206 goto cleanup; 1207 } 1208 1209 user_cmd.chanlist = chanlist; 1210 } 1211 1212 ret = s->do_cmdtest(dev, s, &user_cmd); 1213 1214 /* restore chanlist pointer before copying back */ 1215 user_cmd.chanlist = chanlist_saver; 1216 1217 if (copy_to_user(arg, &user_cmd, sizeof(struct comedi_cmd))) { 1218 DPRINTK("bad cmd address\n"); 1219 ret = -EFAULT; 1220 goto cleanup; 1221 } 1222cleanup: 1223 kfree(chanlist); 1224 1225 return ret; 1226} 1227 1228/* 1229 COMEDI_LOCK 1230 lock subdevice 1231 1232 arg: 1233 subdevice number 1234 1235 reads: 1236 none 1237 1238 writes: 1239 none 1240 1241*/ 1242 1243static int do_lock_ioctl(struct comedi_device *dev, unsigned int arg, 1244 void *file) 1245{ 1246 int ret = 0; 1247 unsigned long flags; 1248 struct comedi_subdevice *s; 1249 1250 if (arg >= dev->n_subdevices) 1251 return -EINVAL; 1252 s = dev->subdevices + arg; 1253 1254 spin_lock_irqsave(&s->spin_lock, flags); 1255 if (s->busy || s->lock) 1256 ret = -EBUSY; 1257 else 1258 s->lock = file; 1259 spin_unlock_irqrestore(&s->spin_lock, flags); 1260 1261 if (ret < 0) 1262 return ret; 1263 1264#if 0 1265 if (s->lock_f) 1266 ret = s->lock_f(dev, s); 1267#endif 1268 1269 return ret; 1270} 1271 1272/* 1273 COMEDI_UNLOCK 1274 unlock subdevice 1275 1276 arg: 1277 subdevice number 1278 1279 reads: 1280 none 1281 1282 writes: 1283 none 1284 1285 This function isn't protected by the semaphore, since 1286 we already own the lock. 1287*/ 1288static int do_unlock_ioctl(struct comedi_device *dev, unsigned int arg, 1289 void *file) 1290{ 1291 struct comedi_subdevice *s; 1292 1293 if (arg >= dev->n_subdevices) 1294 return -EINVAL; 1295 s = dev->subdevices + arg; 1296 1297 if (s->busy) 1298 return -EBUSY; 1299 1300 if (s->lock && s->lock != file) 1301 return -EACCES; 1302 1303 if (s->lock == file) { 1304#if 0 1305 if (s->unlock) 1306 s->unlock(dev, s); 1307#endif 1308 1309 s->lock = NULL; 1310 } 1311 1312 return 0; 1313} 1314 1315/* 1316 COMEDI_CANCEL 1317 cancel acquisition ioctl 1318 1319 arg: 1320 subdevice number 1321 1322 reads: 1323 nothing 1324 1325 writes: 1326 nothing 1327 1328*/ 1329static int do_cancel_ioctl(struct comedi_device *dev, unsigned int arg, 1330 void *file) 1331{ 1332 struct comedi_subdevice *s; 1333 1334 if (arg >= dev->n_subdevices) 1335 return -EINVAL; 1336 s = dev->subdevices + arg; 1337 if (s->async == NULL) 1338 return -EINVAL; 1339 1340 if (s->lock && s->lock != file) 1341 return -EACCES; 1342 1343 if (!s->busy) 1344 return 0; 1345 1346 if (s->busy != file) 1347 return -EBUSY; 1348 1349 return do_cancel(dev, s); 1350} 1351 1352/* 1353 COMEDI_POLL ioctl 1354 instructs driver to synchronize buffers 1355 1356 arg: 1357 subdevice number 1358 1359 reads: 1360 nothing 1361 1362 writes: 1363 nothing 1364 1365*/ 1366static int do_poll_ioctl(struct comedi_device *dev, unsigned int arg, 1367 void *file) 1368{ 1369 struct comedi_subdevice *s; 1370 1371 if (arg >= dev->n_subdevices) 1372 return -EINVAL; 1373 s = dev->subdevices + arg; 1374 1375 if (s->lock && s->lock != file) 1376 return -EACCES; 1377 1378 if (!s->busy) 1379 return 0; 1380 1381 if (s->busy != file) 1382 return -EBUSY; 1383 1384 if (s->poll) 1385 return s->poll(dev, s); 1386 1387 return -EINVAL; 1388} 1389 1390static int do_cancel(struct comedi_device *dev, struct comedi_subdevice *s) 1391{ 1392 int ret = 0; 1393 1394 if ((comedi_get_subdevice_runflags(s) & SRF_RUNNING) && s->cancel) 1395 ret = s->cancel(dev, s); 1396 1397 do_become_nonbusy(dev, s); 1398 1399 return ret; 1400} 1401 1402static void comedi_unmap(struct vm_area_struct *area) 1403{ 1404 struct comedi_async *async; 1405 struct comedi_device *dev; 1406 1407 async = area->vm_private_data; 1408 dev = async->subdevice->device; 1409 1410 mutex_lock(&dev->mutex); 1411 async->mmap_count--; 1412 mutex_unlock(&dev->mutex); 1413} 1414 1415static struct vm_operations_struct comedi_vm_ops = { 1416 .close = comedi_unmap, 1417}; 1418 1419static int comedi_mmap(struct file *file, struct vm_area_struct *vma) 1420{ 1421 const unsigned minor = iminor(file->f_dentry->d_inode); 1422 struct comedi_device_file_info *dev_file_info = 1423 comedi_get_device_file_info(minor); 1424 struct comedi_device *dev = dev_file_info->device; 1425 struct comedi_async *async = NULL; 1426 unsigned long start = vma->vm_start; 1427 unsigned long size; 1428 int n_pages; 1429 int i; 1430 int retval; 1431 struct comedi_subdevice *s; 1432 1433 mutex_lock(&dev->mutex); 1434 if (!dev->attached) { 1435 DPRINTK("no driver configured on comedi%i\n", dev->minor); 1436 retval = -ENODEV; 1437 goto done; 1438 } 1439 if (vma->vm_flags & VM_WRITE) 1440 s = comedi_get_write_subdevice(dev_file_info); 1441 else 1442 s = comedi_get_read_subdevice(dev_file_info); 1443 1444 if (s == NULL) { 1445 retval = -EINVAL; 1446 goto done; 1447 } 1448 async = s->async; 1449 if (async == NULL) { 1450 retval = -EINVAL; 1451 goto done; 1452 } 1453 1454 if (vma->vm_pgoff != 0) { 1455 DPRINTK("comedi: mmap() offset must be 0.\n"); 1456 retval = -EINVAL; 1457 goto done; 1458 } 1459 1460 size = vma->vm_end - vma->vm_start; 1461 if (size > async->prealloc_bufsz) { 1462 retval = -EFAULT; 1463 goto done; 1464 } 1465 if (size & (~PAGE_MASK)) { 1466 retval = -EFAULT; 1467 goto done; 1468 } 1469 1470 n_pages = size >> PAGE_SHIFT; 1471 for (i = 0; i < n_pages; ++i) { 1472 if (remap_pfn_range(vma, start, 1473 page_to_pfn(virt_to_page 1474 (async->buf_page_list 1475 [i].virt_addr)), PAGE_SIZE, 1476 PAGE_SHARED)) { 1477 retval = -EAGAIN; 1478 goto done; 1479 } 1480 start += PAGE_SIZE; 1481 } 1482 1483 vma->vm_ops = &comedi_vm_ops; 1484 vma->vm_private_data = async; 1485 1486 async->mmap_count++; 1487 1488 retval = 0; 1489done: 1490 mutex_unlock(&dev->mutex); 1491 return retval; 1492} 1493 1494static unsigned int comedi_poll(struct file *file, poll_table * wait) 1495{ 1496 unsigned int mask = 0; 1497 const unsigned minor = iminor(file->f_dentry->d_inode); 1498 struct comedi_device_file_info *dev_file_info = 1499 comedi_get_device_file_info(minor); 1500 struct comedi_device *dev = dev_file_info->device; 1501 struct comedi_subdevice *read_subdev; 1502 struct comedi_subdevice *write_subdev; 1503 1504 mutex_lock(&dev->mutex); 1505 if (!dev->attached) { 1506 DPRINTK("no driver configured on comedi%i\n", dev->minor); 1507 mutex_unlock(&dev->mutex); 1508 return 0; 1509 } 1510 1511 mask = 0; 1512 read_subdev = comedi_get_read_subdevice(dev_file_info); 1513 if (read_subdev) { 1514 poll_wait(file, &read_subdev->async->wait_head, wait); 1515 if (!read_subdev->busy 1516 || comedi_buf_read_n_available(read_subdev->async) > 0 1517 || !(comedi_get_subdevice_runflags(read_subdev) & 1518 SRF_RUNNING)) { 1519 mask |= POLLIN | POLLRDNORM; 1520 } 1521 } 1522 write_subdev = comedi_get_write_subdevice(dev_file_info); 1523 if (write_subdev) { 1524 poll_wait(file, &write_subdev->async->wait_head, wait); 1525 comedi_buf_write_alloc(write_subdev->async, 1526 write_subdev->async->prealloc_bufsz); 1527 if (!write_subdev->busy 1528 || !(comedi_get_subdevice_runflags(write_subdev) & 1529 SRF_RUNNING) 1530 || comedi_buf_write_n_allocated(write_subdev->async) >= 1531 bytes_per_sample(write_subdev->async->subdevice)) { 1532 mask |= POLLOUT | POLLWRNORM; 1533 } 1534 } 1535 1536 mutex_unlock(&dev->mutex); 1537 return mask; 1538} 1539 1540static ssize_t comedi_write(struct file *file, const char __user *buf, 1541 size_t nbytes, loff_t *offset) 1542{ 1543 struct comedi_subdevice *s; 1544 struct comedi_async *async; 1545 int n, m, count = 0, retval = 0; 1546 DECLARE_WAITQUEUE(wait, current); 1547 const unsigned minor = iminor(file->f_dentry->d_inode); 1548 struct comedi_device_file_info *dev_file_info = 1549 comedi_get_device_file_info(minor); 1550 struct comedi_device *dev = dev_file_info->device; 1551 1552 if (!dev->attached) { 1553 DPRINTK("no driver configured on comedi%i\n", dev->minor); 1554 retval = -ENODEV; 1555 goto done; 1556 } 1557 1558 s = comedi_get_write_subdevice(dev_file_info); 1559 if (s == NULL) { 1560 retval = -EIO; 1561 goto done; 1562 } 1563 async = s->async; 1564 1565 if (!nbytes) { 1566 retval = 0; 1567 goto done; 1568 } 1569 if (!s->busy) { 1570 retval = 0; 1571 goto done; 1572 } 1573 if (s->busy != file) { 1574 retval = -EACCES; 1575 goto done; 1576 } 1577 add_wait_queue(&async->wait_head, &wait); 1578 while (nbytes > 0 && !retval) { 1579 set_current_state(TASK_INTERRUPTIBLE); 1580 1581 if (!(comedi_get_subdevice_runflags(s) & SRF_RUNNING)) { 1582 if (count == 0) { 1583 if (comedi_get_subdevice_runflags(s) & 1584 SRF_ERROR) { 1585 retval = -EPIPE; 1586 } else { 1587 retval = 0; 1588 } 1589 do_become_nonbusy(dev, s); 1590 } 1591 break; 1592 } 1593 1594 n = nbytes; 1595 1596 m = n; 1597 if (async->buf_write_ptr + m > async->prealloc_bufsz) 1598 m = async->prealloc_bufsz - async->buf_write_ptr; 1599 comedi_buf_write_alloc(async, async->prealloc_bufsz); 1600 if (m > comedi_buf_write_n_allocated(async)) 1601 m = comedi_buf_write_n_allocated(async); 1602 if (m < n) 1603 n = m; 1604 1605 if (n == 0) { 1606 if (file->f_flags & O_NONBLOCK) { 1607 retval = -EAGAIN; 1608 break; 1609 } 1610 if (signal_pending(current)) { 1611 retval = -ERESTARTSYS; 1612 break; 1613 } 1614 schedule(); 1615 if (!s->busy) 1616 break; 1617 if (s->busy != file) { 1618 retval = -EACCES; 1619 break; 1620 } 1621 continue; 1622 } 1623 1624 m = copy_from_user(async->prealloc_buf + async->buf_write_ptr, 1625 buf, n); 1626 if (m) { 1627 n -= m; 1628 retval = -EFAULT; 1629 } 1630 comedi_buf_write_free(async, n); 1631 1632 count += n; 1633 nbytes -= n; 1634 1635 buf += n; 1636 break; /* makes device work like a pipe */ 1637 } 1638 set_current_state(TASK_RUNNING); 1639 remove_wait_queue(&async->wait_head, &wait); 1640 1641done: 1642 return count ? count : retval; 1643} 1644 1645static ssize_t comedi_read(struct file *file, char __user *buf, size_t nbytes, 1646 loff_t *offset) 1647{ 1648 struct comedi_subdevice *s; 1649 struct comedi_async *async; 1650 int n, m, count = 0, retval = 0; 1651 DECLARE_WAITQUEUE(wait, current); 1652 const unsigned minor = iminor(file->f_dentry->d_inode); 1653 struct comedi_device_file_info *dev_file_info = 1654 comedi_get_device_file_info(minor); 1655 struct comedi_device *dev = dev_file_info->device; 1656 1657 if (!dev->attached) { 1658 DPRINTK("no driver configured on comedi%i\n", dev->minor); 1659 retval = -ENODEV; 1660 goto done; 1661 } 1662 1663 s = comedi_get_read_subdevice(dev_file_info); 1664 if (s == NULL) { 1665 retval = -EIO; 1666 goto done; 1667 } 1668 async = s->async; 1669 if (!nbytes) { 1670 retval = 0; 1671 goto done; 1672 } 1673 if (!s->busy) { 1674 retval = 0; 1675 goto done; 1676 } 1677 if (s->busy != file) { 1678 retval = -EACCES; 1679 goto done; 1680 } 1681 1682 add_wait_queue(&async->wait_head, &wait); 1683 while (nbytes > 0 && !retval) { 1684 set_current_state(TASK_INTERRUPTIBLE); 1685 1686 n = nbytes; 1687 1688 m = comedi_buf_read_n_available(async); 1689 /* printk("%d available\n",m); */ 1690 if (async->buf_read_ptr + m > async->prealloc_bufsz) 1691 m = async->prealloc_bufsz - async->buf_read_ptr; 1692 /* printk("%d contiguous\n",m); */ 1693 if (m < n) 1694 n = m; 1695 1696 if (n == 0) { 1697 if (!(comedi_get_subdevice_runflags(s) & SRF_RUNNING)) { 1698 do_become_nonbusy(dev, s); 1699 if (comedi_get_subdevice_runflags(s) & 1700 SRF_ERROR) { 1701 retval = -EPIPE; 1702 } else { 1703 retval = 0; 1704 } 1705 break; 1706 } 1707 if (file->f_flags & O_NONBLOCK) { 1708 retval = -EAGAIN; 1709 break; 1710 } 1711 if (signal_pending(current)) { 1712 retval = -ERESTARTSYS; 1713 break; 1714 } 1715 schedule(); 1716 if (!s->busy) { 1717 retval = 0; 1718 break; 1719 } 1720 if (s->busy != file) { 1721 retval = -EACCES; 1722 break; 1723 } 1724 continue; 1725 } 1726 m = copy_to_user(buf, async->prealloc_buf + 1727 async->buf_read_ptr, n); 1728 if (m) { 1729 n -= m; 1730 retval = -EFAULT; 1731 } 1732 1733 comedi_buf_read_alloc(async, n); 1734 comedi_buf_read_free(async, n); 1735 1736 count += n; 1737 nbytes -= n; 1738 1739 buf += n; 1740 break; /* makes device work like a pipe */ 1741 } 1742 if (!(comedi_get_subdevice_runflags(s) & (SRF_ERROR | SRF_RUNNING)) && 1743 async->buf_read_count - async->buf_write_count == 0) { 1744 do_become_nonbusy(dev, s); 1745 } 1746 set_current_state(TASK_RUNNING); 1747 remove_wait_queue(&async->wait_head, &wait); 1748 1749done: 1750 return count ? count : retval; 1751} 1752 1753/* 1754 This function restores a subdevice to an idle state. 1755 */ 1756void do_become_nonbusy(struct comedi_device *dev, struct comedi_subdevice *s) 1757{ 1758 struct comedi_async *async = s->async; 1759 1760 comedi_set_subdevice_runflags(s, SRF_RUNNING, 0); 1761 if (async) { 1762 comedi_reset_async_buf(async); 1763 async->inttrig = NULL; 1764 } else { 1765 printk(KERN_ERR 1766 "BUG: (?) do_become_nonbusy called with async=0\n"); 1767 } 1768 1769 s->busy = NULL; 1770} 1771 1772static int comedi_open(struct inode *inode, struct file *file) 1773{ 1774 const unsigned minor = iminor(inode); 1775 struct comedi_device_file_info *dev_file_info = 1776 comedi_get_device_file_info(minor); 1777 struct comedi_device *dev = 1778 dev_file_info ? dev_file_info->device : NULL; 1779 1780 if (dev == NULL) { 1781 DPRINTK("invalid minor number\n"); 1782 return -ENODEV; 1783 } 1784 1785 /* This is slightly hacky, but we want module autoloading 1786 * to work for root. 1787 * case: user opens device, attached -> ok 1788 * case: user opens device, unattached, in_request_module=0 -> autoload 1789 * case: user opens device, unattached, in_request_module=1 -> fail 1790 * case: root opens device, attached -> ok 1791 * case: root opens device, unattached, in_request_module=1 -> ok 1792 * (typically called from modprobe) 1793 * case: root opens device, unattached, in_request_module=0 -> autoload 1794 * 1795 * The last could be changed to "-> ok", which would deny root 1796 * autoloading. 1797 */ 1798 mutex_lock(&dev->mutex); 1799 if (dev->attached) 1800 goto ok; 1801 if (!capable(CAP_NET_ADMIN) && dev->in_request_module) { 1802 DPRINTK("in request module\n"); 1803 mutex_unlock(&dev->mutex); 1804 return -ENODEV; 1805 } 1806 if (capable(CAP_NET_ADMIN) && dev->in_request_module) 1807 goto ok; 1808 1809 dev->in_request_module = 1; 1810 1811#ifdef CONFIG_KMOD 1812 mutex_unlock(&dev->mutex); 1813 request_module("char-major-%i-%i", COMEDI_MAJOR, dev->minor); 1814 mutex_lock(&dev->mutex); 1815#endif 1816 1817 dev->in_request_module = 0; 1818 1819 if (!dev->attached && !capable(CAP_NET_ADMIN)) { 1820 DPRINTK("not attached and not CAP_NET_ADMIN\n"); 1821 mutex_unlock(&dev->mutex); 1822 return -ENODEV; 1823 } 1824ok: 1825 __module_get(THIS_MODULE); 1826 1827 if (dev->attached) { 1828 if (!try_module_get(dev->driver->module)) { 1829 module_put(THIS_MODULE); 1830 mutex_unlock(&dev->mutex); 1831 return -ENOSYS; 1832 } 1833 } 1834 1835 if (dev->attached && dev->use_count == 0 && dev->open) 1836 dev->open(dev); 1837 1838 dev->use_count++; 1839 1840 mutex_unlock(&dev->mutex); 1841 1842 return 0; 1843} 1844 1845static int comedi_close(struct inode *inode, struct file *file) 1846{ 1847 const unsigned minor = iminor(inode); 1848 struct comedi_device_file_info *dev_file_info = 1849 comedi_get_device_file_info(minor); 1850 struct comedi_device *dev = dev_file_info->device; 1851 struct comedi_subdevice *s = NULL; 1852 int i; 1853 1854 mutex_lock(&dev->mutex); 1855 1856 if (dev->subdevices) { 1857 for (i = 0; i < dev->n_subdevices; i++) { 1858 s = dev->subdevices + i; 1859 1860 if (s->busy == file) 1861 do_cancel(dev, s); 1862 if (s->lock == file) 1863 s->lock = NULL; 1864 } 1865 } 1866 if (dev->attached && dev->use_count == 1 && dev->close) 1867 dev->close(dev); 1868 1869 module_put(THIS_MODULE); 1870 if (dev->attached) 1871 module_put(dev->driver->module); 1872 1873 dev->use_count--; 1874 1875 mutex_unlock(&dev->mutex); 1876 1877 if (file->f_flags & FASYNC) 1878 comedi_fasync(-1, file, 0); 1879 1880 return 0; 1881} 1882 1883static int comedi_fasync(int fd, struct file *file, int on) 1884{ 1885 const unsigned minor = iminor(file->f_dentry->d_inode); 1886 struct comedi_device_file_info *dev_file_info = 1887 comedi_get_device_file_info(minor); 1888 1889 struct comedi_device *dev = dev_file_info->device; 1890 1891 return fasync_helper(fd, file, on, &dev->async_queue); 1892} 1893 1894const struct file_operations comedi_fops = { 1895 .owner = THIS_MODULE, 1896 .unlocked_ioctl = comedi_unlocked_ioctl, 1897 .compat_ioctl = comedi_compat_ioctl, 1898 .open = comedi_open, 1899 .release = comedi_close, 1900 .read = comedi_read, 1901 .write = comedi_write, 1902 .mmap = comedi_mmap, 1903 .poll = comedi_poll, 1904 .fasync = comedi_fasync, 1905}; 1906 1907struct class *comedi_class; 1908static struct cdev comedi_cdev; 1909 1910static void comedi_cleanup_legacy_minors(void) 1911{ 1912 unsigned i; 1913 1914 for (i = 0; i < comedi_num_legacy_minors; i++) 1915 comedi_free_board_minor(i); 1916} 1917 1918static int __init comedi_init(void) 1919{ 1920 int i; 1921 int retval; 1922 1923 printk(KERN_INFO "comedi: version " COMEDI_RELEASE 1924 " - http://www.comedi.org\n"); 1925 1926 if (comedi_num_legacy_minors < 0 || 1927 comedi_num_legacy_minors > COMEDI_NUM_BOARD_MINORS) { 1928 printk(KERN_ERR "comedi: error: invalid value for module " 1929 "parameter \"comedi_num_legacy_minors\". Valid values " 1930 "are 0 through %i.\n", COMEDI_NUM_BOARD_MINORS); 1931 return -EINVAL; 1932 } 1933 1934 /* 1935 * comedi is unusable if both comedi_autoconfig and 1936 * comedi_num_legacy_minors are zero, so we might as well adjust the 1937 * defaults in that case 1938 */ 1939 if (comedi_autoconfig == 0 && comedi_num_legacy_minors == 0) 1940 comedi_num_legacy_minors = 16; 1941 1942 memset(comedi_file_info_table, 0, 1943 sizeof(struct comedi_device_file_info *) * COMEDI_NUM_MINORS); 1944 1945 retval = register_chrdev_region(MKDEV(COMEDI_MAJOR, 0), 1946 COMEDI_NUM_MINORS, "comedi"); 1947 if (retval) 1948 return -EIO; 1949 cdev_init(&comedi_cdev, &comedi_fops); 1950 comedi_cdev.owner = THIS_MODULE; 1951 kobject_set_name(&comedi_cdev.kobj, "comedi"); 1952 if (cdev_add(&comedi_cdev, MKDEV(COMEDI_MAJOR, 0), COMEDI_NUM_MINORS)) { 1953 unregister_chrdev_region(MKDEV(COMEDI_MAJOR, 0), 1954 COMEDI_NUM_MINORS); 1955 return -EIO; 1956 } 1957 comedi_class = class_create(THIS_MODULE, "comedi"); 1958 if (IS_ERR(comedi_class)) { 1959 printk(KERN_ERR "comedi: failed to create class"); 1960 cdev_del(&comedi_cdev); 1961 unregister_chrdev_region(MKDEV(COMEDI_MAJOR, 0), 1962 COMEDI_NUM_MINORS); 1963 return PTR_ERR(comedi_class); 1964 } 1965 1966 /* XXX requires /proc interface */ 1967 comedi_proc_init(); 1968 1969 /* create devices files for legacy/manual use */ 1970 for (i = 0; i < comedi_num_legacy_minors; i++) { 1971 int minor; 1972 minor = comedi_alloc_board_minor(NULL); 1973 if (minor < 0) { 1974 comedi_cleanup_legacy_minors(); 1975 cdev_del(&comedi_cdev); 1976 unregister_chrdev_region(MKDEV(COMEDI_MAJOR, 0), 1977 COMEDI_NUM_MINORS); 1978 return minor; 1979 } 1980 } 1981 1982 return 0; 1983} 1984 1985static void __exit comedi_cleanup(void) 1986{ 1987 int i; 1988 1989 comedi_cleanup_legacy_minors(); 1990 for (i = 0; i < COMEDI_NUM_MINORS; ++i) 1991 BUG_ON(comedi_file_info_table[i]); 1992 1993 class_destroy(comedi_class); 1994 cdev_del(&comedi_cdev); 1995 unregister_chrdev_region(MKDEV(COMEDI_MAJOR, 0), COMEDI_NUM_MINORS); 1996 1997 comedi_proc_cleanup(); 1998} 1999 2000module_init(comedi_init); 2001module_exit(comedi_cleanup); 2002 2003void comedi_error(const struct comedi_device *dev, const char *s) 2004{ 2005 printk(KERN_ERR "comedi%d: %s: %s\n", dev->minor, 2006 dev->driver->driver_name, s); 2007} 2008EXPORT_SYMBOL(comedi_error); 2009 2010void comedi_event(struct comedi_device *dev, struct comedi_subdevice *s) 2011{ 2012 struct comedi_async *async = s->async; 2013 unsigned runflags = 0; 2014 unsigned runflags_mask = 0; 2015 2016 /* DPRINTK("comedi_event 0x%x\n",mask); */ 2017 2018 if ((comedi_get_subdevice_runflags(s) & SRF_RUNNING) == 0) 2019 return; 2020 2021 if (s-> 2022 async->events & (COMEDI_CB_EOA | COMEDI_CB_ERROR | 2023 COMEDI_CB_OVERFLOW)) { 2024 runflags_mask |= SRF_RUNNING; 2025 } 2026 /* remember if an error event has occured, so an error 2027 * can be returned the next time the user does a read() */ 2028 if (s->async->events & (COMEDI_CB_ERROR | COMEDI_CB_OVERFLOW)) { 2029 runflags_mask |= SRF_ERROR; 2030 runflags |= SRF_ERROR; 2031 } 2032 if (runflags_mask) { 2033 /*sets SRF_ERROR and SRF_RUNNING together atomically */ 2034 comedi_set_subdevice_runflags(s, runflags_mask, runflags); 2035 } 2036 2037 if (async->cb_mask & s->async->events) { 2038 if (comedi_get_subdevice_runflags(s) & SRF_USER) { 2039 wake_up_interruptible(&async->wait_head); 2040 if (s->subdev_flags & SDF_CMD_READ) 2041 kill_fasync(&dev->async_queue, SIGIO, POLL_IN); 2042 if (s->subdev_flags & SDF_CMD_WRITE) 2043 kill_fasync(&dev->async_queue, SIGIO, POLL_OUT); 2044 } else { 2045 if (async->cb_func) 2046 async->cb_func(s->async->events, async->cb_arg); 2047 } 2048 } 2049 s->async->events = 0; 2050} 2051EXPORT_SYMBOL(comedi_event); 2052 2053unsigned comedi_get_subdevice_runflags(struct comedi_subdevice *s) 2054{ 2055 unsigned long flags; 2056 unsigned runflags; 2057 2058 spin_lock_irqsave(&s->spin_lock, flags); 2059 runflags = s->runflags; 2060 spin_unlock_irqrestore(&s->spin_lock, flags); 2061 return runflags; 2062} 2063EXPORT_SYMBOL(comedi_get_subdevice_runflags); 2064 2065static int is_device_busy(struct comedi_device *dev) 2066{ 2067 struct comedi_subdevice *s; 2068 int i; 2069 2070 if (!dev->attached) 2071 return 0; 2072 2073 for (i = 0; i < dev->n_subdevices; i++) { 2074 s = dev->subdevices + i; 2075 if (s->busy) 2076 return 1; 2077 if (s->async && s->async->mmap_count) 2078 return 1; 2079 } 2080 2081 return 0; 2082} 2083 2084static void comedi_device_init(struct comedi_device *dev) 2085{ 2086 memset(dev, 0, sizeof(struct comedi_device)); 2087 spin_lock_init(&dev->spinlock); 2088 mutex_init(&dev->mutex); 2089 dev->minor = -1; 2090} 2091 2092static void comedi_device_cleanup(struct comedi_device *dev) 2093{ 2094 if (dev == NULL) 2095 return; 2096 mutex_lock(&dev->mutex); 2097 comedi_device_detach(dev); 2098 mutex_unlock(&dev->mutex); 2099 mutex_destroy(&dev->mutex); 2100} 2101 2102int comedi_alloc_board_minor(struct device *hardware_device) 2103{ 2104 unsigned long flags; 2105 struct comedi_device_file_info *info; 2106 struct device *csdev; 2107 unsigned i; 2108 int retval; 2109 2110 info = kzalloc(sizeof(struct comedi_device_file_info), GFP_KERNEL); 2111 if (info == NULL) 2112 return -ENOMEM; 2113 info->device = kzalloc(sizeof(struct comedi_device), GFP_KERNEL); 2114 if (info->device == NULL) { 2115 kfree(info); 2116 return -ENOMEM; 2117 } 2118 comedi_device_init(info->device); 2119 spin_lock_irqsave(&comedi_file_info_table_lock, flags); 2120 for (i = 0; i < COMEDI_NUM_BOARD_MINORS; ++i) { 2121 if (comedi_file_info_table[i] == NULL) { 2122 comedi_file_info_table[i] = info; 2123 break; 2124 } 2125 } 2126 spin_unlock_irqrestore(&comedi_file_info_table_lock, flags); 2127 if (i == COMEDI_NUM_BOARD_MINORS) { 2128 comedi_device_cleanup(info->device); 2129 kfree(info->device); 2130 kfree(info); 2131 printk(KERN_ERR 2132 "comedi: error: " 2133 "ran out of minor numbers for board device files.\n"); 2134 return -EBUSY; 2135 } 2136 info->device->minor = i; 2137 csdev = COMEDI_DEVICE_CREATE(comedi_class, NULL, 2138 MKDEV(COMEDI_MAJOR, i), NULL, 2139 hardware_device, "comedi%i", i); 2140 if (!IS_ERR(csdev)) 2141 info->device->class_dev = csdev; 2142 dev_set_drvdata(csdev, info); 2143 retval = device_create_file(csdev, &dev_attr_max_read_buffer_kb); 2144 if (retval) { 2145 printk(KERN_ERR 2146 "comedi: " 2147 "failed to create sysfs attribute file \"%s\".\n", 2148 dev_attr_max_read_buffer_kb.attr.name); 2149 comedi_free_board_minor(i); 2150 return retval; 2151 } 2152 retval = device_create_file(csdev, &dev_attr_read_buffer_kb); 2153 if (retval) { 2154 printk(KERN_ERR 2155 "comedi: " 2156 "failed to create sysfs attribute file \"%s\".\n", 2157 dev_attr_read_buffer_kb.attr.name); 2158 comedi_free_board_minor(i); 2159 return retval; 2160 } 2161 retval = device_create_file(csdev, &dev_attr_max_write_buffer_kb); 2162 if (retval) { 2163 printk(KERN_ERR 2164 "comedi: " 2165 "failed to create sysfs attribute file \"%s\".\n", 2166 dev_attr_max_write_buffer_kb.attr.name); 2167 comedi_free_board_minor(i); 2168 return retval; 2169 } 2170 retval = device_create_file(csdev, &dev_attr_write_buffer_kb); 2171 if (retval) { 2172 printk(KERN_ERR 2173 "comedi: " 2174 "failed to create sysfs attribute file \"%s\".\n", 2175 dev_attr_write_buffer_kb.attr.name); 2176 comedi_free_board_minor(i); 2177 return retval; 2178 } 2179 return i; 2180} 2181 2182void comedi_free_board_minor(unsigned minor) 2183{ 2184 unsigned long flags; 2185 struct comedi_device_file_info *info; 2186 2187 BUG_ON(minor >= COMEDI_NUM_BOARD_MINORS); 2188 spin_lock_irqsave(&comedi_file_info_table_lock, flags); 2189 info = comedi_file_info_table[minor]; 2190 comedi_file_info_table[minor] = NULL; 2191 spin_unlock_irqrestore(&comedi_file_info_table_lock, flags); 2192 2193 if (info) { 2194 struct comedi_device *dev = info->device; 2195 if (dev) { 2196 if (dev->class_dev) { 2197 device_destroy(comedi_class, 2198 MKDEV(COMEDI_MAJOR, dev->minor)); 2199 } 2200 comedi_device_cleanup(dev); 2201 kfree(dev); 2202 } 2203 kfree(info); 2204 } 2205} 2206 2207int comedi_alloc_subdevice_minor(struct comedi_device *dev, 2208 struct comedi_subdevice *s) 2209{ 2210 unsigned long flags; 2211 struct comedi_device_file_info *info; 2212 struct device *csdev; 2213 unsigned i; 2214 int retval; 2215 2216 info = kmalloc(sizeof(struct comedi_device_file_info), GFP_KERNEL); 2217 if (info == NULL) 2218 return -ENOMEM; 2219 info->device = dev; 2220 info->read_subdevice = s; 2221 info->write_subdevice = s; 2222 spin_lock_irqsave(&comedi_file_info_table_lock, flags); 2223 for (i = COMEDI_FIRST_SUBDEVICE_MINOR; i < COMEDI_NUM_MINORS; ++i) { 2224 if (comedi_file_info_table[i] == NULL) { 2225 comedi_file_info_table[i] = info; 2226 break; 2227 } 2228 } 2229 spin_unlock_irqrestore(&comedi_file_info_table_lock, flags); 2230 if (i == COMEDI_NUM_MINORS) { 2231 kfree(info); 2232 printk(KERN_ERR 2233 "comedi: error: " 2234 "ran out of minor numbers for board device files.\n"); 2235 return -EBUSY; 2236 } 2237 s->minor = i; 2238 csdev = COMEDI_DEVICE_CREATE(comedi_class, dev->class_dev, 2239 MKDEV(COMEDI_MAJOR, i), NULL, NULL, 2240 "comedi%i_subd%i", dev->minor, 2241 (int)(s - dev->subdevices)); 2242 if (!IS_ERR(csdev)) 2243 s->class_dev = csdev; 2244 dev_set_drvdata(csdev, info); 2245 retval = device_create_file(csdev, &dev_attr_max_read_buffer_kb); 2246 if (retval) { 2247 printk(KERN_ERR 2248 "comedi: " 2249 "failed to create sysfs attribute file \"%s\".\n", 2250 dev_attr_max_read_buffer_kb.attr.name); 2251 comedi_free_subdevice_minor(s); 2252 return retval; 2253 } 2254 retval = device_create_file(csdev, &dev_attr_read_buffer_kb); 2255 if (retval) { 2256 printk(KERN_ERR 2257 "comedi: " 2258 "failed to create sysfs attribute file \"%s\".\n", 2259 dev_attr_read_buffer_kb.attr.name); 2260 comedi_free_subdevice_minor(s); 2261 return retval; 2262 } 2263 retval = device_create_file(csdev, &dev_attr_max_write_buffer_kb); 2264 if (retval) { 2265 printk(KERN_ERR 2266 "comedi: " 2267 "failed to create sysfs attribute file \"%s\".\n", 2268 dev_attr_max_write_buffer_kb.attr.name); 2269 comedi_free_subdevice_minor(s); 2270 return retval; 2271 } 2272 retval = device_create_file(csdev, &dev_attr_write_buffer_kb); 2273 if (retval) { 2274 printk(KERN_ERR 2275 "comedi: " 2276 "failed to create sysfs attribute file \"%s\".\n", 2277 dev_attr_write_buffer_kb.attr.name); 2278 comedi_free_subdevice_minor(s); 2279 return retval; 2280 } 2281 return i; 2282} 2283 2284void comedi_free_subdevice_minor(struct comedi_subdevice *s) 2285{ 2286 unsigned long flags; 2287 struct comedi_device_file_info *info; 2288 2289 if (s == NULL) 2290 return; 2291 if (s->minor < 0) 2292 return; 2293 2294 BUG_ON(s->minor >= COMEDI_NUM_MINORS); 2295 BUG_ON(s->minor < COMEDI_FIRST_SUBDEVICE_MINOR); 2296 2297 spin_lock_irqsave(&comedi_file_info_table_lock, flags); 2298 info = comedi_file_info_table[s->minor]; 2299 comedi_file_info_table[s->minor] = NULL; 2300 spin_unlock_irqrestore(&comedi_file_info_table_lock, flags); 2301 2302 if (s->class_dev) { 2303 device_destroy(comedi_class, MKDEV(COMEDI_MAJOR, s->minor)); 2304 s->class_dev = NULL; 2305 } 2306 kfree(info); 2307} 2308 2309struct comedi_device_file_info *comedi_get_device_file_info(unsigned minor) 2310{ 2311 unsigned long flags; 2312 struct comedi_device_file_info *info; 2313 2314 BUG_ON(minor >= COMEDI_NUM_MINORS); 2315 spin_lock_irqsave(&comedi_file_info_table_lock, flags); 2316 info = comedi_file_info_table[minor]; 2317 spin_unlock_irqrestore(&comedi_file_info_table_lock, flags); 2318 return info; 2319} 2320EXPORT_SYMBOL_GPL(comedi_get_device_file_info); 2321 2322static int resize_async_buffer(struct comedi_device *dev, 2323 struct comedi_subdevice *s, 2324 struct comedi_async *async, unsigned new_size) 2325{ 2326 int retval; 2327 2328 if (new_size > async->max_bufsize) 2329 return -EPERM; 2330 2331 if (s->busy) { 2332 DPRINTK("subdevice is busy, cannot resize buffer\n"); 2333 return -EBUSY; 2334 } 2335 if (async->mmap_count) { 2336 DPRINTK("subdevice is mmapped, cannot resize buffer\n"); 2337 return -EBUSY; 2338 } 2339 2340 if (!async->prealloc_buf) 2341 return -EINVAL; 2342 2343 /* make sure buffer is an integral number of pages 2344 * (we round up) */ 2345 new_size = (new_size + PAGE_SIZE - 1) & PAGE_MASK; 2346 2347 retval = comedi_buf_alloc(dev, s, new_size); 2348 if (retval < 0) 2349 return retval; 2350 2351 if (s->buf_change) { 2352 retval = s->buf_change(dev, s, new_size); 2353 if (retval < 0) 2354 return retval; 2355 } 2356 2357 DPRINTK("comedi%i subd %d buffer resized to %i bytes\n", 2358 dev->minor, (int)(s - dev->subdevices), async->prealloc_bufsz); 2359 return 0; 2360} 2361 2362/* sysfs attribute files */ 2363 2364static const unsigned bytes_per_kibi = 1024; 2365 2366static ssize_t show_max_read_buffer_kb(struct device *dev, 2367 struct device_attribute *attr, char *buf) 2368{ 2369 ssize_t retval; 2370 struct comedi_device_file_info *info = dev_get_drvdata(dev); 2371 unsigned max_buffer_size_kb = 0; 2372 struct comedi_subdevice *const read_subdevice = 2373 comedi_get_read_subdevice(info); 2374 2375 mutex_lock(&info->device->mutex); 2376 if (read_subdevice && 2377 (read_subdevice->subdev_flags & SDF_CMD_READ) && 2378 read_subdevice->async) { 2379 max_buffer_size_kb = read_subdevice->async->max_bufsize / 2380 bytes_per_kibi; 2381 } 2382 retval = snprintf(buf, PAGE_SIZE, "%i\n", max_buffer_size_kb); 2383 mutex_unlock(&info->device->mutex); 2384 2385 return retval; 2386} 2387 2388static ssize_t store_max_read_buffer_kb(struct device *dev, 2389 struct device_attribute *attr, 2390 const char *buf, size_t count) 2391{ 2392 struct comedi_device_file_info *info = dev_get_drvdata(dev); 2393 unsigned long new_max_size_kb; 2394 uint64_t new_max_size; 2395 struct comedi_subdevice *const read_subdevice = 2396 comedi_get_read_subdevice(info); 2397 2398 if (strict_strtoul(buf, 10, &new_max_size_kb)) 2399 return -EINVAL; 2400 if (new_max_size_kb != (uint32_t) new_max_size_kb) 2401 return -EINVAL; 2402 new_max_size = ((uint64_t) new_max_size_kb) * bytes_per_kibi; 2403 if (new_max_size != (uint32_t) new_max_size) 2404 return -EINVAL; 2405 2406 mutex_lock(&info->device->mutex); 2407 if (read_subdevice == NULL || 2408 (read_subdevice->subdev_flags & SDF_CMD_READ) == 0 || 2409 read_subdevice->async == NULL) { 2410 mutex_unlock(&info->device->mutex); 2411 return -EINVAL; 2412 } 2413 read_subdevice->async->max_bufsize = new_max_size; 2414 mutex_unlock(&info->device->mutex); 2415 2416 return count; 2417} 2418 2419static struct device_attribute dev_attr_max_read_buffer_kb = { 2420 .attr = { 2421 .name = "max_read_buffer_kb", 2422 .mode = S_IRUGO | S_IWUSR}, 2423 .show = &show_max_read_buffer_kb, 2424 .store = &store_max_read_buffer_kb 2425}; 2426 2427static ssize_t show_read_buffer_kb(struct device *dev, 2428 struct device_attribute *attr, char *buf) 2429{ 2430 ssize_t retval; 2431 struct comedi_device_file_info *info = dev_get_drvdata(dev); 2432 unsigned buffer_size_kb = 0; 2433 struct comedi_subdevice *const read_subdevice = 2434 comedi_get_read_subdevice(info); 2435 2436 mutex_lock(&info->device->mutex); 2437 if (read_subdevice && 2438 (read_subdevice->subdev_flags & SDF_CMD_READ) && 2439 read_subdevice->async) { 2440 buffer_size_kb = read_subdevice->async->prealloc_bufsz / 2441 bytes_per_kibi; 2442 } 2443 retval = snprintf(buf, PAGE_SIZE, "%i\n", buffer_size_kb); 2444 mutex_unlock(&info->device->mutex); 2445 2446 return retval; 2447} 2448 2449static ssize_t store_read_buffer_kb(struct device *dev, 2450 struct device_attribute *attr, 2451 const char *buf, size_t count) 2452{ 2453 struct comedi_device_file_info *info = dev_get_drvdata(dev); 2454 unsigned long new_size_kb; 2455 uint64_t new_size; 2456 int retval; 2457 struct comedi_subdevice *const read_subdevice = 2458 comedi_get_read_subdevice(info); 2459 2460 if (strict_strtoul(buf, 10, &new_size_kb)) 2461 return -EINVAL; 2462 if (new_size_kb != (uint32_t) new_size_kb) 2463 return -EINVAL; 2464 new_size = ((uint64_t) new_size_kb) * bytes_per_kibi; 2465 if (new_size != (uint32_t) new_size) 2466 return -EINVAL; 2467 2468 mutex_lock(&info->device->mutex); 2469 if (read_subdevice == NULL || 2470 (read_subdevice->subdev_flags & SDF_CMD_READ) == 0 || 2471 read_subdevice->async == NULL) { 2472 mutex_unlock(&info->device->mutex); 2473 return -EINVAL; 2474 } 2475 retval = resize_async_buffer(info->device, read_subdevice, 2476 read_subdevice->async, new_size); 2477 mutex_unlock(&info->device->mutex); 2478 2479 if (retval < 0) 2480 return retval; 2481 return count; 2482} 2483 2484static struct device_attribute dev_attr_read_buffer_kb = { 2485 .attr = { 2486 .name = "read_buffer_kb", 2487 .mode = S_IRUGO | S_IWUSR | S_IWGRP}, 2488 .show = &show_read_buffer_kb, 2489 .store = &store_read_buffer_kb 2490}; 2491 2492static ssize_t show_max_write_buffer_kb(struct device *dev, 2493 struct device_attribute *attr, 2494 char *buf) 2495{ 2496 ssize_t retval; 2497 struct comedi_device_file_info *info = dev_get_drvdata(dev); 2498 unsigned max_buffer_size_kb = 0; 2499 struct comedi_subdevice *const write_subdevice = 2500 comedi_get_write_subdevice(info); 2501 2502 mutex_lock(&info->device->mutex); 2503 if (write_subdevice && 2504 (write_subdevice->subdev_flags & SDF_CMD_WRITE) && 2505 write_subdevice->async) { 2506 max_buffer_size_kb = write_subdevice->async->max_bufsize / 2507 bytes_per_kibi; 2508 } 2509 retval = snprintf(buf, PAGE_SIZE, "%i\n", max_buffer_size_kb); 2510 mutex_unlock(&info->device->mutex); 2511 2512 return retval; 2513} 2514 2515static ssize_t store_max_write_buffer_kb(struct device *dev, 2516 struct device_attribute *attr, 2517 const char *buf, size_t count) 2518{ 2519 struct comedi_device_file_info *info = dev_get_drvdata(dev); 2520 unsigned long new_max_size_kb; 2521 uint64_t new_max_size; 2522 struct comedi_subdevice *const write_subdevice = 2523 comedi_get_write_subdevice(info); 2524 2525 if (strict_strtoul(buf, 10, &new_max_size_kb)) 2526 return -EINVAL; 2527 if (new_max_size_kb != (uint32_t) new_max_size_kb) 2528 return -EINVAL; 2529 new_max_size = ((uint64_t) new_max_size_kb) * bytes_per_kibi; 2530 if (new_max_size != (uint32_t) new_max_size) 2531 return -EINVAL; 2532 2533 mutex_lock(&info->device->mutex); 2534 if (write_subdevice == NULL || 2535 (write_subdevice->subdev_flags & SDF_CMD_WRITE) == 0 || 2536 write_subdevice->async == NULL) { 2537 mutex_unlock(&info->device->mutex); 2538 return -EINVAL; 2539 } 2540 write_subdevice->async->max_bufsize = new_max_size; 2541 mutex_unlock(&info->device->mutex); 2542 2543 return count; 2544} 2545 2546static struct device_attribute dev_attr_max_write_buffer_kb = { 2547 .attr = { 2548 .name = "max_write_buffer_kb", 2549 .mode = S_IRUGO | S_IWUSR}, 2550 .show = &show_max_write_buffer_kb, 2551 .store = &store_max_write_buffer_kb 2552}; 2553 2554static ssize_t show_write_buffer_kb(struct device *dev, 2555 struct device_attribute *attr, char *buf) 2556{ 2557 ssize_t retval; 2558 struct comedi_device_file_info *info = dev_get_drvdata(dev); 2559 unsigned buffer_size_kb = 0; 2560 struct comedi_subdevice *const write_subdevice = 2561 comedi_get_write_subdevice(info); 2562 2563 mutex_lock(&info->device->mutex); 2564 if (write_subdevice && 2565 (write_subdevice->subdev_flags & SDF_CMD_WRITE) && 2566 write_subdevice->async) { 2567 buffer_size_kb = write_subdevice->async->prealloc_bufsz / 2568 bytes_per_kibi; 2569 } 2570 retval = snprintf(buf, PAGE_SIZE, "%i\n", buffer_size_kb); 2571 mutex_unlock(&info->device->mutex); 2572 2573 return retval; 2574} 2575 2576static ssize_t store_write_buffer_kb(struct device *dev, 2577 struct device_attribute *attr, 2578 const char *buf, size_t count) 2579{ 2580 struct comedi_device_file_info *info = dev_get_drvdata(dev); 2581 unsigned long new_size_kb; 2582 uint64_t new_size; 2583 int retval; 2584 struct comedi_subdevice *const write_subdevice = 2585 comedi_get_write_subdevice(info); 2586 2587 if (strict_strtoul(buf, 10, &new_size_kb)) 2588 return -EINVAL; 2589 if (new_size_kb != (uint32_t) new_size_kb) 2590 return -EINVAL; 2591 new_size = ((uint64_t) new_size_kb) * bytes_per_kibi; 2592 if (new_size != (uint32_t) new_size) 2593 return -EINVAL; 2594 2595 mutex_lock(&info->device->mutex); 2596 if (write_subdevice == NULL || 2597 (write_subdevice->subdev_flags & SDF_CMD_WRITE) == 0 || 2598 write_subdevice->async == NULL) { 2599 mutex_unlock(&info->device->mutex); 2600 return -EINVAL; 2601 } 2602 retval = resize_async_buffer(info->device, write_subdevice, 2603 write_subdevice->async, new_size); 2604 mutex_unlock(&info->device->mutex); 2605 2606 if (retval < 0) 2607 return retval; 2608 return count; 2609} 2610 2611static struct device_attribute dev_attr_write_buffer_kb = { 2612 .attr = { 2613 .name = "write_buffer_kb", 2614 .mode = S_IRUGO | S_IWUSR | S_IWGRP}, 2615 .show = &show_write_buffer_kb, 2616 .store = &store_write_buffer_kb 2617}; 2618