comedi_fops.c revision 9e8c604821b372c6e98e9632f5617913bf92ae45
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 67int 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 *arg); 76static int do_bufconfig_ioctl(struct comedi_device *dev, void *arg); 77static int do_devinfo_ioctl(struct comedi_device *dev, 78 struct comedi_devinfo *arg, struct file *file); 79static int do_subdinfo_ioctl(struct comedi_device *dev, 80 struct comedi_subdinfo *arg, void *file); 81static int do_chaninfo_ioctl(struct comedi_device *dev, 82 struct comedi_chaninfo *arg); 83static int do_bufinfo_ioctl(struct comedi_device *dev, void *arg); 84static int do_cmd_ioctl(struct comedi_device *dev, void *arg, void *file); 85static int do_lock_ioctl(struct comedi_device *dev, unsigned int arg, 86 void *file); 87static int do_unlock_ioctl(struct comedi_device *dev, unsigned int arg, 88 void *file); 89static int do_cancel_ioctl(struct comedi_device *dev, unsigned int arg, 90 void *file); 91static int do_cmdtest_ioctl(struct comedi_device *dev, void *arg, void *file); 92static int do_insnlist_ioctl(struct comedi_device *dev, void *arg, void *file); 93static int do_insn_ioctl(struct comedi_device *dev, void *arg, void *file); 94static int do_poll_ioctl(struct comedi_device *dev, unsigned int subd, 95 void *file); 96 97extern void do_become_nonbusy(struct comedi_device *dev, 98 struct comedi_subdevice *s); 99static int do_cancel(struct comedi_device *dev, struct comedi_subdevice *s); 100 101static int comedi_fasync(int fd, struct file *file, int on); 102 103static int is_device_busy(struct comedi_device *dev); 104static int resize_async_buffer(struct comedi_device *dev, 105 struct comedi_subdevice *s, 106 struct comedi_async *async, unsigned new_size); 107 108/* declarations for sysfs attribute files */ 109static struct device_attribute dev_attr_max_read_buffer_kb; 110static struct device_attribute dev_attr_read_buffer_kb; 111static struct device_attribute dev_attr_max_write_buffer_kb; 112static struct device_attribute dev_attr_write_buffer_kb; 113 114static long comedi_unlocked_ioctl(struct file *file, unsigned int cmd, 115 unsigned long arg) 116{ 117 const unsigned minor = iminor(file->f_dentry->d_inode); 118 struct comedi_device_file_info *dev_file_info = 119 comedi_get_device_file_info(minor); 120 struct comedi_device *dev; 121 int rc; 122 123 if (dev_file_info == NULL || dev_file_info->device == NULL) 124 return -ENODEV; 125 dev = dev_file_info->device; 126 127 mutex_lock(&dev->mutex); 128 129 /* Device config is special, because it must work on 130 * an unconfigured device. */ 131 if (cmd == COMEDI_DEVCONFIG) { 132 rc = do_devconfig_ioctl(dev, (void *)arg); 133 goto done; 134 } 135 136 if (!dev->attached) { 137 DPRINTK("no driver configured on /dev/comedi%i\n", dev->minor); 138 rc = -ENODEV; 139 goto done; 140 } 141 142 switch (cmd) { 143 case COMEDI_BUFCONFIG: 144 rc = do_bufconfig_ioctl(dev, (void *)arg); 145 break; 146 case COMEDI_DEVINFO: 147 rc = do_devinfo_ioctl(dev, (void *)arg, file); 148 break; 149 case COMEDI_SUBDINFO: 150 rc = do_subdinfo_ioctl(dev, (void *)arg, file); 151 break; 152 case COMEDI_CHANINFO: 153 rc = do_chaninfo_ioctl(dev, (void *)arg); 154 break; 155 case COMEDI_RANGEINFO: 156 rc = do_rangeinfo_ioctl(dev, (void *)arg); 157 break; 158 case COMEDI_BUFINFO: 159 rc = do_bufinfo_ioctl(dev, (void *)arg); 160 break; 161 case COMEDI_LOCK: 162 rc = do_lock_ioctl(dev, arg, file); 163 break; 164 case COMEDI_UNLOCK: 165 rc = do_unlock_ioctl(dev, arg, file); 166 break; 167 case COMEDI_CANCEL: 168 rc = do_cancel_ioctl(dev, arg, file); 169 break; 170 case COMEDI_CMD: 171 rc = do_cmd_ioctl(dev, (void *)arg, file); 172 break; 173 case COMEDI_CMDTEST: 174 rc = do_cmdtest_ioctl(dev, (void *)arg, file); 175 break; 176 case COMEDI_INSNLIST: 177 rc = do_insnlist_ioctl(dev, (void *)arg, file); 178 break; 179 case COMEDI_INSN: 180 rc = do_insn_ioctl(dev, (void *)arg, file); 181 break; 182 case COMEDI_POLL: 183 rc = do_poll_ioctl(dev, arg, file); 184 break; 185 default: 186 rc = -ENOTTY; 187 break; 188 } 189 190done: 191 mutex_unlock(&dev->mutex); 192 return rc; 193} 194 195/* 196 COMEDI_DEVCONFIG 197 device config ioctl 198 199 arg: 200 pointer to devconfig structure 201 202 reads: 203 devconfig structure at arg 204 205 writes: 206 none 207*/ 208static int do_devconfig_ioctl(struct comedi_device *dev, 209 struct comedi_devconfig *arg) 210{ 211 struct comedi_devconfig it; 212 int ret; 213 unsigned char *aux_data = NULL; 214 int aux_len; 215 216 if (!capable(CAP_SYS_ADMIN)) 217 return -EPERM; 218 219 if (arg == NULL) { 220 if (is_device_busy(dev)) 221 return -EBUSY; 222 if (dev->attached) { 223 struct module *driver_module = dev->driver->module; 224 comedi_device_detach(dev); 225 module_put(driver_module); 226 } 227 return 0; 228 } 229 230 if (copy_from_user(&it, arg, sizeof(struct comedi_devconfig))) 231 return -EFAULT; 232 233 it.board_name[COMEDI_NAMELEN - 1] = 0; 234 235 if (comedi_aux_data(it.options, 0) && 236 it.options[COMEDI_DEVCONF_AUX_DATA_LENGTH]) { 237 int bit_shift; 238 aux_len = it.options[COMEDI_DEVCONF_AUX_DATA_LENGTH]; 239 if (aux_len < 0) 240 return -EFAULT; 241 242 aux_data = vmalloc(aux_len); 243 if (!aux_data) 244 return -ENOMEM; 245 246 if (copy_from_user(aux_data, 247 comedi_aux_data(it.options, 0), aux_len)) { 248 vfree(aux_data); 249 return -EFAULT; 250 } 251 it.options[COMEDI_DEVCONF_AUX_DATA_LO] = 252 (unsigned long)aux_data; 253 if (sizeof(void *) > sizeof(int)) { 254 bit_shift = sizeof(int) * 8; 255 it.options[COMEDI_DEVCONF_AUX_DATA_HI] = 256 ((unsigned long)aux_data) >> bit_shift; 257 } else 258 it.options[COMEDI_DEVCONF_AUX_DATA_HI] = 0; 259 } 260 261 ret = comedi_device_attach(dev, &it); 262 if (ret == 0) { 263 if (!try_module_get(dev->driver->module)) { 264 comedi_device_detach(dev); 265 return -ENOSYS; 266 } 267 } 268 269 if (aux_data) 270 vfree(aux_data); 271 272 return ret; 273} 274 275/* 276 COMEDI_BUFCONFIG 277 buffer configuration ioctl 278 279 arg: 280 pointer to bufconfig structure 281 282 reads: 283 bufconfig at arg 284 285 writes: 286 modified bufconfig at arg 287 288*/ 289static int do_bufconfig_ioctl(struct comedi_device *dev, void *arg) 290{ 291 struct comedi_bufconfig bc; 292 struct comedi_async *async; 293 struct comedi_subdevice *s; 294 int retval = 0; 295 296 if (copy_from_user(&bc, arg, sizeof(struct comedi_bufconfig))) 297 return -EFAULT; 298 299 if (bc.subdevice >= dev->n_subdevices || bc.subdevice < 0) 300 return -EINVAL; 301 302 s = dev->subdevices + bc.subdevice; 303 async = s->async; 304 305 if (!async) { 306 DPRINTK("subdevice does not have async capability\n"); 307 bc.size = 0; 308 bc.maximum_size = 0; 309 goto copyback; 310 } 311 312 if (bc.maximum_size) { 313 if (!capable(CAP_SYS_ADMIN)) 314 return -EPERM; 315 316 async->max_bufsize = bc.maximum_size; 317 } 318 319 if (bc.size) { 320 retval = resize_async_buffer(dev, s, async, bc.size); 321 if (retval < 0) 322 return retval; 323 } 324 325 bc.size = async->prealloc_bufsz; 326 bc.maximum_size = async->max_bufsize; 327 328copyback: 329 if (copy_to_user(arg, &bc, sizeof(struct comedi_bufconfig))) 330 return -EFAULT; 331 332 return 0; 333} 334 335/* 336 COMEDI_DEVINFO 337 device info ioctl 338 339 arg: 340 pointer to devinfo structure 341 342 reads: 343 none 344 345 writes: 346 devinfo structure 347 348*/ 349static int do_devinfo_ioctl(struct comedi_device *dev, 350 struct comedi_devinfo *arg, struct file *file) 351{ 352 struct comedi_devinfo devinfo; 353 const unsigned minor = iminor(file->f_dentry->d_inode); 354 struct comedi_device_file_info *dev_file_info = 355 comedi_get_device_file_info(minor); 356 struct comedi_subdevice *read_subdev = 357 comedi_get_read_subdevice(dev_file_info); 358 struct comedi_subdevice *write_subdev = 359 comedi_get_write_subdevice(dev_file_info); 360 361 memset(&devinfo, 0, sizeof(devinfo)); 362 363 /* fill devinfo structure */ 364 devinfo.version_code = COMEDI_VERSION_CODE; 365 devinfo.n_subdevs = dev->n_subdevices; 366 memcpy(devinfo.driver_name, dev->driver->driver_name, COMEDI_NAMELEN); 367 memcpy(devinfo.board_name, dev->board_name, COMEDI_NAMELEN); 368 369 if (read_subdev) 370 devinfo.read_subdevice = read_subdev - dev->subdevices; 371 else 372 devinfo.read_subdevice = -1; 373 374 if (write_subdev) 375 devinfo.write_subdevice = write_subdev - dev->subdevices; 376 else 377 devinfo.write_subdevice = -1; 378 379 if (copy_to_user(arg, &devinfo, sizeof(struct comedi_devinfo))) 380 return -EFAULT; 381 382 return 0; 383} 384 385/* 386 COMEDI_SUBDINFO 387 subdevice info ioctl 388 389 arg: 390 pointer to array of subdevice info structures 391 392 reads: 393 none 394 395 writes: 396 array of subdevice info structures at arg 397 398*/ 399static int do_subdinfo_ioctl(struct comedi_device *dev, 400 struct comedi_subdinfo *arg, void *file) 401{ 402 int ret, i; 403 struct comedi_subdinfo *tmp, *us; 404 struct comedi_subdevice *s; 405 406 tmp = 407 kcalloc(dev->n_subdevices, sizeof(struct comedi_subdinfo), 408 GFP_KERNEL); 409 if (!tmp) 410 return -ENOMEM; 411 412 /* fill subdinfo structs */ 413 for (i = 0; i < dev->n_subdevices; i++) { 414 s = dev->subdevices + i; 415 us = tmp + i; 416 417 us->type = s->type; 418 us->n_chan = s->n_chan; 419 us->subd_flags = s->subdev_flags; 420 if (comedi_get_subdevice_runflags(s) & SRF_RUNNING) 421 us->subd_flags |= SDF_RUNNING; 422#define TIMER_nanosec 5 /* backwards compatibility */ 423 us->timer_type = TIMER_nanosec; 424 us->len_chanlist = s->len_chanlist; 425 us->maxdata = s->maxdata; 426 if (s->range_table) { 427 us->range_type = 428 (i << 24) | (0 << 16) | (s->range_table->length); 429 } else { 430 us->range_type = 0; /* XXX */ 431 } 432 us->flags = s->flags; 433 434 if (s->busy) 435 us->subd_flags |= SDF_BUSY; 436 if (s->busy == file) 437 us->subd_flags |= SDF_BUSY_OWNER; 438 if (s->lock) 439 us->subd_flags |= SDF_LOCKED; 440 if (s->lock == file) 441 us->subd_flags |= SDF_LOCK_OWNER; 442 if (!s->maxdata && s->maxdata_list) 443 us->subd_flags |= SDF_MAXDATA; 444 if (s->flaglist) 445 us->subd_flags |= SDF_FLAGS; 446 if (s->range_table_list) 447 us->subd_flags |= SDF_RANGETYPE; 448 if (s->do_cmd) 449 us->subd_flags |= SDF_CMD; 450 451 if (s->insn_bits != &insn_inval) 452 us->insn_bits_support = COMEDI_SUPPORTED; 453 else 454 us->insn_bits_support = COMEDI_UNSUPPORTED; 455 456 us->settling_time_0 = s->settling_time_0; 457 } 458 459 ret = copy_to_user(arg, tmp, 460 dev->n_subdevices * sizeof(struct comedi_subdinfo)); 461 462 kfree(tmp); 463 464 return ret ? -EFAULT : 0; 465} 466 467/* 468 COMEDI_CHANINFO 469 subdevice info ioctl 470 471 arg: 472 pointer to chaninfo structure 473 474 reads: 475 chaninfo structure at arg 476 477 writes: 478 arrays at elements of chaninfo structure 479 480*/ 481static int do_chaninfo_ioctl(struct comedi_device *dev, 482 struct comedi_chaninfo *arg) 483{ 484 struct comedi_subdevice *s; 485 struct comedi_chaninfo it; 486 487 if (copy_from_user(&it, arg, sizeof(struct comedi_chaninfo))) 488 return -EFAULT; 489 490 if (it.subdev >= dev->n_subdevices) 491 return -EINVAL; 492 s = dev->subdevices + it.subdev; 493 494 if (it.maxdata_list) { 495 if (s->maxdata || !s->maxdata_list) 496 return -EINVAL; 497 if (copy_to_user(it.maxdata_list, s->maxdata_list, 498 s->n_chan * sizeof(unsigned int))) 499 return -EFAULT; 500 } 501 502 if (it.flaglist) { 503 if (!s->flaglist) 504 return -EINVAL; 505 if (copy_to_user(it.flaglist, s->flaglist, 506 s->n_chan * sizeof(unsigned int))) 507 return -EFAULT; 508 } 509 510 if (it.rangelist) { 511 int i; 512 513 if (!s->range_table_list) 514 return -EINVAL; 515 for (i = 0; i < s->n_chan; i++) { 516 int x; 517 518 x = (dev->minor << 28) | (it.subdev << 24) | (i << 16) | 519 (s->range_table_list[i]->length); 520 put_user(x, it.rangelist + i); 521 } 522#if 0 523 if (copy_to_user(it.rangelist, s->range_type_list, 524 s->n_chan * sizeof(unsigned int))) 525 return -EFAULT; 526#endif 527 } 528 529 return 0; 530} 531 532 /* 533 COMEDI_BUFINFO 534 buffer information ioctl 535 536 arg: 537 pointer to bufinfo structure 538 539 reads: 540 bufinfo at arg 541 542 writes: 543 modified bufinfo at arg 544 545 */ 546static int do_bufinfo_ioctl(struct comedi_device *dev, void *arg) 547{ 548 struct comedi_bufinfo bi; 549 struct comedi_subdevice *s; 550 struct comedi_async *async; 551 552 if (copy_from_user(&bi, arg, sizeof(struct comedi_bufinfo))) 553 return -EFAULT; 554 555 if (bi.subdevice >= dev->n_subdevices || bi.subdevice < 0) 556 return -EINVAL; 557 558 s = dev->subdevices + bi.subdevice; 559 async = s->async; 560 561 if (!async) { 562 DPRINTK("subdevice does not have async capability\n"); 563 bi.buf_write_ptr = 0; 564 bi.buf_read_ptr = 0; 565 bi.buf_write_count = 0; 566 bi.buf_read_count = 0; 567 goto copyback; 568 } 569 570 if (bi.bytes_read && (s->subdev_flags & SDF_CMD_READ)) { 571 bi.bytes_read = comedi_buf_read_alloc(async, bi.bytes_read); 572 comedi_buf_read_free(async, bi.bytes_read); 573 574 if (!(comedi_get_subdevice_runflags(s) & (SRF_ERROR | 575 SRF_RUNNING)) 576 && async->buf_write_count == async->buf_read_count) { 577 do_become_nonbusy(dev, s); 578 } 579 } 580 581 if (bi.bytes_written && (s->subdev_flags & SDF_CMD_WRITE)) { 582 bi.bytes_written = 583 comedi_buf_write_alloc(async, bi.bytes_written); 584 comedi_buf_write_free(async, bi.bytes_written); 585 } 586 587 bi.buf_write_count = async->buf_write_count; 588 bi.buf_write_ptr = async->buf_write_ptr; 589 bi.buf_read_count = async->buf_read_count; 590 bi.buf_read_ptr = async->buf_read_ptr; 591 592copyback: 593 if (copy_to_user(arg, &bi, sizeof(struct comedi_bufinfo))) 594 return -EFAULT; 595 596 return 0; 597} 598 599static int parse_insn(struct comedi_device *dev, struct comedi_insn *insn, 600 unsigned int *data, void *file); 601/* 602 * COMEDI_INSNLIST 603 * synchronous instructions 604 * 605 * arg: 606 * pointer to sync cmd structure 607 * 608 * reads: 609 * sync cmd struct at arg 610 * instruction list 611 * data (for writes) 612 * 613 * writes: 614 * data (for reads) 615 */ 616/* arbitrary limits */ 617#define MAX_SAMPLES 256 618static int do_insnlist_ioctl(struct comedi_device *dev, void *arg, void *file) 619{ 620 struct comedi_insnlist insnlist; 621 struct comedi_insn *insns = NULL; 622 unsigned int *data = NULL; 623 int i = 0; 624 int ret = 0; 625 626 if (copy_from_user(&insnlist, arg, sizeof(struct comedi_insnlist))) 627 return -EFAULT; 628 629 data = kmalloc(sizeof(unsigned int) * MAX_SAMPLES, GFP_KERNEL); 630 if (!data) { 631 DPRINTK("kmalloc failed\n"); 632 ret = -ENOMEM; 633 goto error; 634 } 635 636 insns = 637 kmalloc(sizeof(struct comedi_insn) * insnlist.n_insns, GFP_KERNEL); 638 if (!insns) { 639 DPRINTK("kmalloc failed\n"); 640 ret = -ENOMEM; 641 goto error; 642 } 643 644 if (copy_from_user(insns, insnlist.insns, 645 sizeof(struct comedi_insn) * insnlist.n_insns)) { 646 DPRINTK("copy_from_user failed\n"); 647 ret = -EFAULT; 648 goto error; 649 } 650 651 for (i = 0; i < insnlist.n_insns; i++) { 652 if (insns[i].n > MAX_SAMPLES) { 653 DPRINTK("number of samples too large\n"); 654 ret = -EINVAL; 655 goto error; 656 } 657 if (insns[i].insn & INSN_MASK_WRITE) { 658 if (copy_from_user(data, insns[i].data, 659 insns[i].n * sizeof(unsigned int))) { 660 DPRINTK("copy_from_user failed\n"); 661 ret = -EFAULT; 662 goto error; 663 } 664 } 665 ret = parse_insn(dev, insns + i, data, file); 666 if (ret < 0) 667 goto error; 668 if (insns[i].insn & INSN_MASK_READ) { 669 if (copy_to_user(insns[i].data, data, 670 insns[i].n * sizeof(unsigned int))) { 671 DPRINTK("copy_to_user failed\n"); 672 ret = -EFAULT; 673 goto error; 674 } 675 } 676 if (need_resched()) 677 schedule(); 678 } 679 680error: 681 kfree(insns); 682 kfree(data); 683 684 if (ret < 0) 685 return ret; 686 return i; 687} 688 689static int check_insn_config_length(struct comedi_insn *insn, 690 unsigned int *data) 691{ 692 if (insn->n < 1) 693 return -EINVAL; 694 695 switch (data[0]) { 696 case INSN_CONFIG_DIO_OUTPUT: 697 case INSN_CONFIG_DIO_INPUT: 698 case INSN_CONFIG_DISARM: 699 case INSN_CONFIG_RESET: 700 if (insn->n == 1) 701 return 0; 702 break; 703 case INSN_CONFIG_ARM: 704 case INSN_CONFIG_DIO_QUERY: 705 case INSN_CONFIG_BLOCK_SIZE: 706 case INSN_CONFIG_FILTER: 707 case INSN_CONFIG_SERIAL_CLOCK: 708 case INSN_CONFIG_BIDIRECTIONAL_DATA: 709 case INSN_CONFIG_ALT_SOURCE: 710 case INSN_CONFIG_SET_COUNTER_MODE: 711 case INSN_CONFIG_8254_READ_STATUS: 712 case INSN_CONFIG_SET_ROUTING: 713 case INSN_CONFIG_GET_ROUTING: 714 case INSN_CONFIG_GET_PWM_STATUS: 715 case INSN_CONFIG_PWM_SET_PERIOD: 716 case INSN_CONFIG_PWM_GET_PERIOD: 717 if (insn->n == 2) 718 return 0; 719 break; 720 case INSN_CONFIG_SET_GATE_SRC: 721 case INSN_CONFIG_GET_GATE_SRC: 722 case INSN_CONFIG_SET_CLOCK_SRC: 723 case INSN_CONFIG_GET_CLOCK_SRC: 724 case INSN_CONFIG_SET_OTHER_SRC: 725 case INSN_CONFIG_GET_COUNTER_STATUS: 726 case INSN_CONFIG_PWM_SET_H_BRIDGE: 727 case INSN_CONFIG_PWM_GET_H_BRIDGE: 728 case INSN_CONFIG_GET_HARDWARE_BUFFER_SIZE: 729 if (insn->n == 3) 730 return 0; 731 break; 732 case INSN_CONFIG_PWM_OUTPUT: 733 case INSN_CONFIG_ANALOG_TRIG: 734 if (insn->n == 5) 735 return 0; 736 break; 737 /* by default we allow the insn since we don't have checks for 738 * all possible cases yet */ 739 default: 740 printk(KERN_WARNING 741 "comedi: no check for data length of config insn id " 742 "%i is implemented.\n" 743 " Add a check to %s in %s.\n" 744 " Assuming n=%i is correct.\n", data[0], __func__, 745 __FILE__, insn->n); 746 return 0; 747 break; 748 } 749 return -EINVAL; 750} 751 752static int parse_insn(struct comedi_device *dev, struct comedi_insn *insn, 753 unsigned int *data, void *file) 754{ 755 struct comedi_subdevice *s; 756 int ret = 0; 757 int i; 758 759 if (insn->insn & INSN_MASK_SPECIAL) { 760 /* a non-subdevice instruction */ 761 762 switch (insn->insn) { 763 case INSN_GTOD: 764 { 765 struct timeval tv; 766 767 if (insn->n != 2) { 768 ret = -EINVAL; 769 break; 770 } 771 772 do_gettimeofday(&tv); 773 data[0] = tv.tv_sec; 774 data[1] = tv.tv_usec; 775 ret = 2; 776 777 break; 778 } 779 case INSN_WAIT: 780 if (insn->n != 1 || data[0] >= 100000) { 781 ret = -EINVAL; 782 break; 783 } 784 udelay(data[0] / 1000); 785 ret = 1; 786 break; 787 case INSN_INTTRIG: 788 if (insn->n != 1) { 789 ret = -EINVAL; 790 break; 791 } 792 if (insn->subdev >= dev->n_subdevices) { 793 DPRINTK("%d not usable subdevice\n", 794 insn->subdev); 795 ret = -EINVAL; 796 break; 797 } 798 s = dev->subdevices + insn->subdev; 799 if (!s->async) { 800 DPRINTK("no async\n"); 801 ret = -EINVAL; 802 break; 803 } 804 if (!s->async->inttrig) { 805 DPRINTK("no inttrig\n"); 806 ret = -EAGAIN; 807 break; 808 } 809 ret = s->async->inttrig(dev, s, insn->data[0]); 810 if (ret >= 0) 811 ret = 1; 812 break; 813 default: 814 DPRINTK("invalid insn\n"); 815 ret = -EINVAL; 816 break; 817 } 818 } else { 819 /* a subdevice instruction */ 820 unsigned int maxdata; 821 822 if (insn->subdev >= dev->n_subdevices) { 823 DPRINTK("subdevice %d out of range\n", insn->subdev); 824 ret = -EINVAL; 825 goto out; 826 } 827 s = dev->subdevices + insn->subdev; 828 829 if (s->type == COMEDI_SUBD_UNUSED) { 830 DPRINTK("%d not usable subdevice\n", insn->subdev); 831 ret = -EIO; 832 goto out; 833 } 834 835 /* are we locked? (ioctl lock) */ 836 if (s->lock && s->lock != file) { 837 DPRINTK("device locked\n"); 838 ret = -EACCES; 839 goto out; 840 } 841 842 ret = comedi_check_chanlist(s, 1, &insn->chanspec); 843 if (ret < 0) { 844 ret = -EINVAL; 845 DPRINTK("bad chanspec\n"); 846 goto out; 847 } 848 849 if (s->busy) { 850 ret = -EBUSY; 851 goto out; 852 } 853 /* This looks arbitrary. It is. */ 854 s->busy = &parse_insn; 855 switch (insn->insn) { 856 case INSN_READ: 857 ret = s->insn_read(dev, s, insn, data); 858 break; 859 case INSN_WRITE: 860 maxdata = s->maxdata_list 861 ? s->maxdata_list[CR_CHAN(insn->chanspec)] 862 : s->maxdata; 863 for (i = 0; i < insn->n; ++i) { 864 if (data[i] > maxdata) { 865 ret = -EINVAL; 866 DPRINTK("bad data value(s)\n"); 867 break; 868 } 869 } 870 if (ret == 0) 871 ret = s->insn_write(dev, s, insn, data); 872 break; 873 case INSN_BITS: 874 if (insn->n != 2) { 875 ret = -EINVAL; 876 break; 877 } 878 ret = s->insn_bits(dev, s, insn, data); 879 break; 880 case INSN_CONFIG: 881 ret = check_insn_config_length(insn, data); 882 if (ret) 883 break; 884 ret = s->insn_config(dev, s, insn, data); 885 break; 886 default: 887 ret = -EINVAL; 888 break; 889 } 890 891 s->busy = NULL; 892 } 893 894out: 895 return ret; 896} 897 898/* 899 * COMEDI_INSN 900 * synchronous instructions 901 * 902 * arg: 903 * pointer to insn 904 * 905 * reads: 906 * struct comedi_insn struct at arg 907 * data (for writes) 908 * 909 * writes: 910 * data (for reads) 911 */ 912static int do_insn_ioctl(struct comedi_device *dev, void *arg, void *file) 913{ 914 struct comedi_insn insn; 915 unsigned int *data = NULL; 916 int ret = 0; 917 918 data = kmalloc(sizeof(unsigned int) * MAX_SAMPLES, GFP_KERNEL); 919 if (!data) { 920 ret = -ENOMEM; 921 goto error; 922 } 923 924 if (copy_from_user(&insn, arg, sizeof(struct comedi_insn))) { 925 ret = -EFAULT; 926 goto error; 927 } 928 929 /* This is where the behavior of insn and insnlist deviate. */ 930 if (insn.n > MAX_SAMPLES) 931 insn.n = MAX_SAMPLES; 932 if (insn.insn & INSN_MASK_WRITE) { 933 if (copy_from_user 934 (data, insn.data, insn.n * sizeof(unsigned int))) { 935 ret = -EFAULT; 936 goto error; 937 } 938 } 939 ret = parse_insn(dev, &insn, data, file); 940 if (ret < 0) 941 goto error; 942 if (insn.insn & INSN_MASK_READ) { 943 if (copy_to_user 944 (insn.data, data, insn.n * sizeof(unsigned int))) { 945 ret = -EFAULT; 946 goto error; 947 } 948 } 949 ret = insn.n; 950 951error: 952 kfree(data); 953 954 return ret; 955} 956 957static void comedi_set_subdevice_runflags(struct comedi_subdevice *s, 958 unsigned mask, unsigned bits) 959{ 960 unsigned long flags; 961 962 spin_lock_irqsave(&s->spin_lock, flags); 963 s->runflags &= ~mask; 964 s->runflags |= (bits & mask); 965 spin_unlock_irqrestore(&s->spin_lock, flags); 966} 967 968/* 969 COMEDI_CMD 970 command ioctl 971 972 arg: 973 pointer to cmd structure 974 975 reads: 976 cmd structure at arg 977 channel/range list 978 979 writes: 980 modified cmd structure at arg 981 982*/ 983static int do_cmd_ioctl(struct comedi_device *dev, void *arg, void *file) 984{ 985 struct comedi_cmd user_cmd; 986 struct comedi_subdevice *s; 987 struct comedi_async *async; 988 int ret = 0; 989 unsigned int *chanlist_saver = NULL; 990 991 if (copy_from_user(&user_cmd, arg, sizeof(struct comedi_cmd))) { 992 DPRINTK("bad cmd address\n"); 993 return -EFAULT; 994 } 995 /* save user's chanlist pointer so it can be restored later */ 996 chanlist_saver = user_cmd.chanlist; 997 998 if (user_cmd.subdev >= dev->n_subdevices) { 999 DPRINTK("%d no such subdevice\n", user_cmd.subdev); 1000 return -ENODEV; 1001 } 1002 1003 s = dev->subdevices + user_cmd.subdev; 1004 async = s->async; 1005 1006 if (s->type == COMEDI_SUBD_UNUSED) { 1007 DPRINTK("%d not valid subdevice\n", user_cmd.subdev); 1008 return -EIO; 1009 } 1010 1011 if (!s->do_cmd || !s->do_cmdtest || !s->async) { 1012 DPRINTK("subdevice %i does not support commands\n", 1013 user_cmd.subdev); 1014 return -EIO; 1015 } 1016 1017 /* are we locked? (ioctl lock) */ 1018 if (s->lock && s->lock != file) { 1019 DPRINTK("subdevice locked\n"); 1020 return -EACCES; 1021 } 1022 1023 /* are we busy? */ 1024 if (s->busy) { 1025 DPRINTK("subdevice busy\n"); 1026 return -EBUSY; 1027 } 1028 s->busy = file; 1029 1030 /* make sure channel/gain list isn't too long */ 1031 if (user_cmd.chanlist_len > s->len_chanlist) { 1032 DPRINTK("channel/gain list too long %u > %d\n", 1033 user_cmd.chanlist_len, s->len_chanlist); 1034 ret = -EINVAL; 1035 goto cleanup; 1036 } 1037 1038 /* make sure channel/gain list isn't too short */ 1039 if (user_cmd.chanlist_len < 1) { 1040 DPRINTK("channel/gain list too short %u < 1\n", 1041 user_cmd.chanlist_len); 1042 ret = -EINVAL; 1043 goto cleanup; 1044 } 1045 1046 kfree(async->cmd.chanlist); 1047 async->cmd = user_cmd; 1048 async->cmd.data = NULL; 1049 /* load channel/gain list */ 1050 async->cmd.chanlist = 1051 kmalloc(async->cmd.chanlist_len * sizeof(int), GFP_KERNEL); 1052 if (!async->cmd.chanlist) { 1053 DPRINTK("allocation failed\n"); 1054 ret = -ENOMEM; 1055 goto cleanup; 1056 } 1057 1058 if (copy_from_user(async->cmd.chanlist, user_cmd.chanlist, 1059 async->cmd.chanlist_len * sizeof(int))) { 1060 DPRINTK("fault reading chanlist\n"); 1061 ret = -EFAULT; 1062 goto cleanup; 1063 } 1064 1065 /* make sure each element in channel/gain list is valid */ 1066 ret = comedi_check_chanlist(s, async->cmd.chanlist_len, async->cmd.chanlist); 1067 if (ret < 0) { 1068 DPRINTK("bad chanlist\n"); 1069 goto cleanup; 1070 } 1071 1072 ret = s->do_cmdtest(dev, s, &async->cmd); 1073 1074 if (async->cmd.flags & TRIG_BOGUS || ret) { 1075 DPRINTK("test returned %d\n", ret); 1076 user_cmd = async->cmd; 1077 /* restore chanlist pointer before copying back */ 1078 user_cmd.chanlist = chanlist_saver; 1079 user_cmd.data = NULL; 1080 if (copy_to_user(arg, &user_cmd, sizeof(struct comedi_cmd))) { 1081 DPRINTK("fault writing cmd\n"); 1082 ret = -EFAULT; 1083 goto cleanup; 1084 } 1085 ret = -EAGAIN; 1086 goto cleanup; 1087 } 1088 1089 if (!async->prealloc_bufsz) { 1090 ret = -ENOMEM; 1091 DPRINTK("no buffer (?)\n"); 1092 goto cleanup; 1093 } 1094 1095 comedi_reset_async_buf(async); 1096 1097 async->cb_mask = 1098 COMEDI_CB_EOA | COMEDI_CB_BLOCK | COMEDI_CB_ERROR | 1099 COMEDI_CB_OVERFLOW; 1100 if (async->cmd.flags & TRIG_WAKE_EOS) 1101 async->cb_mask |= COMEDI_CB_EOS; 1102 1103 comedi_set_subdevice_runflags(s, ~0, SRF_USER | SRF_RUNNING); 1104 1105 ret = s->do_cmd(dev, s); 1106 if (ret == 0) 1107 return 0; 1108 1109cleanup: 1110 do_become_nonbusy(dev, s); 1111 1112 return ret; 1113} 1114 1115/* 1116 COMEDI_CMDTEST 1117 command testing ioctl 1118 1119 arg: 1120 pointer to cmd structure 1121 1122 reads: 1123 cmd structure at arg 1124 channel/range list 1125 1126 writes: 1127 modified cmd structure at arg 1128 1129*/ 1130static int do_cmdtest_ioctl(struct comedi_device *dev, void *arg, void *file) 1131{ 1132 struct comedi_cmd user_cmd; 1133 struct comedi_subdevice *s; 1134 int ret = 0; 1135 unsigned int *chanlist = NULL; 1136 unsigned int *chanlist_saver = NULL; 1137 1138 if (copy_from_user(&user_cmd, arg, sizeof(struct comedi_cmd))) { 1139 DPRINTK("bad cmd address\n"); 1140 return -EFAULT; 1141 } 1142 /* save user's chanlist pointer so it can be restored later */ 1143 chanlist_saver = user_cmd.chanlist; 1144 1145 if (user_cmd.subdev >= dev->n_subdevices) { 1146 DPRINTK("%d no such subdevice\n", user_cmd.subdev); 1147 return -ENODEV; 1148 } 1149 1150 s = dev->subdevices + user_cmd.subdev; 1151 if (s->type == COMEDI_SUBD_UNUSED) { 1152 DPRINTK("%d not valid subdevice\n", user_cmd.subdev); 1153 return -EIO; 1154 } 1155 1156 if (!s->do_cmd || !s->do_cmdtest) { 1157 DPRINTK("subdevice %i does not support commands\n", 1158 user_cmd.subdev); 1159 return -EIO; 1160 } 1161 1162 /* make sure channel/gain list isn't too long */ 1163 if (user_cmd.chanlist_len > s->len_chanlist) { 1164 DPRINTK("channel/gain list too long %d > %d\n", 1165 user_cmd.chanlist_len, s->len_chanlist); 1166 ret = -EINVAL; 1167 goto cleanup; 1168 } 1169 1170 /* load channel/gain list */ 1171 if (user_cmd.chanlist) { 1172 chanlist = 1173 kmalloc(user_cmd.chanlist_len * sizeof(int), GFP_KERNEL); 1174 if (!chanlist) { 1175 DPRINTK("allocation failed\n"); 1176 ret = -ENOMEM; 1177 goto cleanup; 1178 } 1179 1180 if (copy_from_user(chanlist, user_cmd.chanlist, 1181 user_cmd.chanlist_len * sizeof(int))) { 1182 DPRINTK("fault reading chanlist\n"); 1183 ret = -EFAULT; 1184 goto cleanup; 1185 } 1186 1187 /* make sure each element in channel/gain list is valid */ 1188 ret = comedi_check_chanlist(s, user_cmd.chanlist_len, chanlist); 1189 if (ret < 0) { 1190 DPRINTK("bad chanlist\n"); 1191 goto cleanup; 1192 } 1193 1194 user_cmd.chanlist = chanlist; 1195 } 1196 1197 ret = s->do_cmdtest(dev, s, &user_cmd); 1198 1199 /* restore chanlist pointer before copying back */ 1200 user_cmd.chanlist = chanlist_saver; 1201 1202 if (copy_to_user(arg, &user_cmd, sizeof(struct comedi_cmd))) { 1203 DPRINTK("bad cmd address\n"); 1204 ret = -EFAULT; 1205 goto cleanup; 1206 } 1207cleanup: 1208 kfree(chanlist); 1209 1210 return ret; 1211} 1212 1213/* 1214 COMEDI_LOCK 1215 lock subdevice 1216 1217 arg: 1218 subdevice number 1219 1220 reads: 1221 none 1222 1223 writes: 1224 none 1225 1226*/ 1227 1228static int do_lock_ioctl(struct comedi_device *dev, unsigned int arg, 1229 void *file) 1230{ 1231 int ret = 0; 1232 unsigned long flags; 1233 struct comedi_subdevice *s; 1234 1235 if (arg >= dev->n_subdevices) 1236 return -EINVAL; 1237 s = dev->subdevices + arg; 1238 1239 spin_lock_irqsave(&s->spin_lock, flags); 1240 if (s->busy || s->lock) 1241 ret = -EBUSY; 1242 else 1243 s->lock = file; 1244 spin_unlock_irqrestore(&s->spin_lock, flags); 1245 1246 if (ret < 0) 1247 return ret; 1248 1249#if 0 1250 if (s->lock_f) 1251 ret = s->lock_f(dev, s); 1252#endif 1253 1254 return ret; 1255} 1256 1257/* 1258 COMEDI_UNLOCK 1259 unlock subdevice 1260 1261 arg: 1262 subdevice number 1263 1264 reads: 1265 none 1266 1267 writes: 1268 none 1269 1270 This function isn't protected by the semaphore, since 1271 we already own the lock. 1272*/ 1273static int do_unlock_ioctl(struct comedi_device *dev, unsigned int arg, 1274 void *file) 1275{ 1276 struct comedi_subdevice *s; 1277 1278 if (arg >= dev->n_subdevices) 1279 return -EINVAL; 1280 s = dev->subdevices + arg; 1281 1282 if (s->busy) 1283 return -EBUSY; 1284 1285 if (s->lock && s->lock != file) 1286 return -EACCES; 1287 1288 if (s->lock == file) { 1289#if 0 1290 if (s->unlock) 1291 s->unlock(dev, s); 1292#endif 1293 1294 s->lock = NULL; 1295 } 1296 1297 return 0; 1298} 1299 1300/* 1301 COMEDI_CANCEL 1302 cancel acquisition ioctl 1303 1304 arg: 1305 subdevice number 1306 1307 reads: 1308 nothing 1309 1310 writes: 1311 nothing 1312 1313*/ 1314static int do_cancel_ioctl(struct comedi_device *dev, unsigned int arg, 1315 void *file) 1316{ 1317 struct comedi_subdevice *s; 1318 1319 if (arg >= dev->n_subdevices) 1320 return -EINVAL; 1321 s = dev->subdevices + arg; 1322 if (s->async == NULL) 1323 return -EINVAL; 1324 1325 if (s->lock && s->lock != file) 1326 return -EACCES; 1327 1328 if (!s->busy) 1329 return 0; 1330 1331 if (s->busy != file) 1332 return -EBUSY; 1333 1334 return do_cancel(dev, s); 1335} 1336 1337/* 1338 COMEDI_POLL ioctl 1339 instructs driver to synchronize buffers 1340 1341 arg: 1342 subdevice number 1343 1344 reads: 1345 nothing 1346 1347 writes: 1348 nothing 1349 1350*/ 1351static int do_poll_ioctl(struct comedi_device *dev, unsigned int arg, 1352 void *file) 1353{ 1354 struct comedi_subdevice *s; 1355 1356 if (arg >= dev->n_subdevices) 1357 return -EINVAL; 1358 s = dev->subdevices + arg; 1359 1360 if (s->lock && s->lock != file) 1361 return -EACCES; 1362 1363 if (!s->busy) 1364 return 0; 1365 1366 if (s->busy != file) 1367 return -EBUSY; 1368 1369 if (s->poll) 1370 return s->poll(dev, s); 1371 1372 return -EINVAL; 1373} 1374 1375static int do_cancel(struct comedi_device *dev, struct comedi_subdevice *s) 1376{ 1377 int ret = 0; 1378 1379 if ((comedi_get_subdevice_runflags(s) & SRF_RUNNING) && s->cancel) 1380 ret = s->cancel(dev, s); 1381 1382 do_become_nonbusy(dev, s); 1383 1384 return ret; 1385} 1386 1387void comedi_unmap(struct vm_area_struct *area) 1388{ 1389 struct comedi_async *async; 1390 struct comedi_device *dev; 1391 1392 async = area->vm_private_data; 1393 dev = async->subdevice->device; 1394 1395 mutex_lock(&dev->mutex); 1396 async->mmap_count--; 1397 mutex_unlock(&dev->mutex); 1398} 1399 1400static struct vm_operations_struct comedi_vm_ops = { 1401 .close = comedi_unmap, 1402}; 1403 1404static int comedi_mmap(struct file *file, struct vm_area_struct *vma) 1405{ 1406 const unsigned minor = iminor(file->f_dentry->d_inode); 1407 struct comedi_device_file_info *dev_file_info = 1408 comedi_get_device_file_info(minor); 1409 struct comedi_device *dev = dev_file_info->device; 1410 struct comedi_async *async = NULL; 1411 unsigned long start = vma->vm_start; 1412 unsigned long size; 1413 int n_pages; 1414 int i; 1415 int retval; 1416 struct comedi_subdevice *s; 1417 1418 mutex_lock(&dev->mutex); 1419 if (!dev->attached) { 1420 DPRINTK("no driver configured on comedi%i\n", dev->minor); 1421 retval = -ENODEV; 1422 goto done; 1423 } 1424 if (vma->vm_flags & VM_WRITE) 1425 s = comedi_get_write_subdevice(dev_file_info); 1426 else 1427 s = comedi_get_read_subdevice(dev_file_info); 1428 1429 if (s == NULL) { 1430 retval = -EINVAL; 1431 goto done; 1432 } 1433 async = s->async; 1434 if (async == NULL) { 1435 retval = -EINVAL; 1436 goto done; 1437 } 1438 1439 if (vma->vm_pgoff != 0) { 1440 DPRINTK("comedi: mmap() offset must be 0.\n"); 1441 retval = -EINVAL; 1442 goto done; 1443 } 1444 1445 size = vma->vm_end - vma->vm_start; 1446 if (size > async->prealloc_bufsz) { 1447 retval = -EFAULT; 1448 goto done; 1449 } 1450 if (size & (~PAGE_MASK)) { 1451 retval = -EFAULT; 1452 goto done; 1453 } 1454 1455 n_pages = size >> PAGE_SHIFT; 1456 for (i = 0; i < n_pages; ++i) { 1457 if (remap_pfn_range(vma, start, 1458 page_to_pfn(virt_to_page 1459 (async->buf_page_list 1460 [i].virt_addr)), PAGE_SIZE, 1461 PAGE_SHARED)) { 1462 retval = -EAGAIN; 1463 goto done; 1464 } 1465 start += PAGE_SIZE; 1466 } 1467 1468 vma->vm_ops = &comedi_vm_ops; 1469 vma->vm_private_data = async; 1470 1471 async->mmap_count++; 1472 1473 retval = 0; 1474done: 1475 mutex_unlock(&dev->mutex); 1476 return retval; 1477} 1478 1479static unsigned int comedi_poll(struct file *file, poll_table * wait) 1480{ 1481 unsigned int mask = 0; 1482 const unsigned minor = iminor(file->f_dentry->d_inode); 1483 struct comedi_device_file_info *dev_file_info = 1484 comedi_get_device_file_info(minor); 1485 struct comedi_device *dev = dev_file_info->device; 1486 struct comedi_subdevice *read_subdev; 1487 struct comedi_subdevice *write_subdev; 1488 1489 mutex_lock(&dev->mutex); 1490 if (!dev->attached) { 1491 DPRINTK("no driver configured on comedi%i\n", dev->minor); 1492 mutex_unlock(&dev->mutex); 1493 return 0; 1494 } 1495 1496 mask = 0; 1497 read_subdev = comedi_get_read_subdevice(dev_file_info); 1498 if (read_subdev) { 1499 poll_wait(file, &read_subdev->async->wait_head, wait); 1500 if (!read_subdev->busy 1501 || comedi_buf_read_n_available(read_subdev->async) > 0 1502 || !(comedi_get_subdevice_runflags(read_subdev) & 1503 SRF_RUNNING)) { 1504 mask |= POLLIN | POLLRDNORM; 1505 } 1506 } 1507 write_subdev = comedi_get_write_subdevice(dev_file_info); 1508 if (write_subdev) { 1509 poll_wait(file, &write_subdev->async->wait_head, wait); 1510 comedi_buf_write_alloc(write_subdev->async, 1511 write_subdev->async->prealloc_bufsz); 1512 if (!write_subdev->busy 1513 || !(comedi_get_subdevice_runflags(write_subdev) & 1514 SRF_RUNNING) 1515 || comedi_buf_write_n_allocated(write_subdev->async) >= 1516 bytes_per_sample(write_subdev->async->subdevice)) { 1517 mask |= POLLOUT | POLLWRNORM; 1518 } 1519 } 1520 1521 mutex_unlock(&dev->mutex); 1522 return mask; 1523} 1524 1525static ssize_t comedi_write(struct file *file, const char *buf, size_t nbytes, 1526 loff_t *offset) 1527{ 1528 struct comedi_subdevice *s; 1529 struct comedi_async *async; 1530 int n, m, count = 0, retval = 0; 1531 DECLARE_WAITQUEUE(wait, current); 1532 const unsigned minor = iminor(file->f_dentry->d_inode); 1533 struct comedi_device_file_info *dev_file_info = 1534 comedi_get_device_file_info(minor); 1535 struct comedi_device *dev = dev_file_info->device; 1536 1537 if (!dev->attached) { 1538 DPRINTK("no driver configured on comedi%i\n", dev->minor); 1539 retval = -ENODEV; 1540 goto done; 1541 } 1542 1543 s = comedi_get_write_subdevice(dev_file_info); 1544 if (s == NULL) { 1545 retval = -EIO; 1546 goto done; 1547 } 1548 async = s->async; 1549 1550 if (!nbytes) { 1551 retval = 0; 1552 goto done; 1553 } 1554 if (!s->busy) { 1555 retval = 0; 1556 goto done; 1557 } 1558 if (s->busy != file) { 1559 retval = -EACCES; 1560 goto done; 1561 } 1562 add_wait_queue(&async->wait_head, &wait); 1563 while (nbytes > 0 && !retval) { 1564 set_current_state(TASK_INTERRUPTIBLE); 1565 1566 n = nbytes; 1567 1568 m = n; 1569 if (async->buf_write_ptr + m > async->prealloc_bufsz) 1570 m = async->prealloc_bufsz - async->buf_write_ptr; 1571 comedi_buf_write_alloc(async, async->prealloc_bufsz); 1572 if (m > comedi_buf_write_n_allocated(async)) 1573 m = comedi_buf_write_n_allocated(async); 1574 if (m < n) 1575 n = m; 1576 1577 if (n == 0) { 1578 if (!(comedi_get_subdevice_runflags(s) & SRF_RUNNING)) { 1579 if (comedi_get_subdevice_runflags(s) & 1580 SRF_ERROR) { 1581 retval = -EPIPE; 1582 } else { 1583 retval = 0; 1584 } 1585 do_become_nonbusy(dev, s); 1586 break; 1587 } 1588 if (file->f_flags & O_NONBLOCK) { 1589 retval = -EAGAIN; 1590 break; 1591 } 1592 if (signal_pending(current)) { 1593 retval = -ERESTARTSYS; 1594 break; 1595 } 1596 schedule(); 1597 if (!s->busy) 1598 break; 1599 if (s->busy != file) { 1600 retval = -EACCES; 1601 break; 1602 } 1603 continue; 1604 } 1605 1606 m = copy_from_user(async->prealloc_buf + async->buf_write_ptr, 1607 buf, n); 1608 if (m) { 1609 n -= m; 1610 retval = -EFAULT; 1611 } 1612 comedi_buf_write_free(async, n); 1613 1614 count += n; 1615 nbytes -= n; 1616 1617 buf += n; 1618 break; /* makes device work like a pipe */ 1619 } 1620 set_current_state(TASK_RUNNING); 1621 remove_wait_queue(&async->wait_head, &wait); 1622 1623done: 1624 return count ? count : retval; 1625} 1626 1627static ssize_t comedi_read(struct file *file, char *buf, size_t nbytes, 1628 loff_t *offset) 1629{ 1630 struct comedi_subdevice *s; 1631 struct comedi_async *async; 1632 int n, m, count = 0, retval = 0; 1633 DECLARE_WAITQUEUE(wait, current); 1634 const unsigned minor = iminor(file->f_dentry->d_inode); 1635 struct comedi_device_file_info *dev_file_info = 1636 comedi_get_device_file_info(minor); 1637 struct comedi_device *dev = dev_file_info->device; 1638 1639 if (!dev->attached) { 1640 DPRINTK("no driver configured on comedi%i\n", dev->minor); 1641 retval = -ENODEV; 1642 goto done; 1643 } 1644 1645 s = comedi_get_read_subdevice(dev_file_info); 1646 if (s == NULL) { 1647 retval = -EIO; 1648 goto done; 1649 } 1650 async = s->async; 1651 if (!nbytes) { 1652 retval = 0; 1653 goto done; 1654 } 1655 if (!s->busy) { 1656 retval = 0; 1657 goto done; 1658 } 1659 if (s->busy != file) { 1660 retval = -EACCES; 1661 goto done; 1662 } 1663 1664 add_wait_queue(&async->wait_head, &wait); 1665 while (nbytes > 0 && !retval) { 1666 set_current_state(TASK_INTERRUPTIBLE); 1667 1668 n = nbytes; 1669 1670 m = comedi_buf_read_n_available(async); 1671 /* printk("%d available\n",m); */ 1672 if (async->buf_read_ptr + m > async->prealloc_bufsz) 1673 m = async->prealloc_bufsz - async->buf_read_ptr; 1674 /* printk("%d contiguous\n",m); */ 1675 if (m < n) 1676 n = m; 1677 1678 if (n == 0) { 1679 if (!(comedi_get_subdevice_runflags(s) & SRF_RUNNING)) { 1680 do_become_nonbusy(dev, s); 1681 if (comedi_get_subdevice_runflags(s) & 1682 SRF_ERROR) { 1683 retval = -EPIPE; 1684 } else { 1685 retval = 0; 1686 } 1687 break; 1688 } 1689 if (file->f_flags & O_NONBLOCK) { 1690 retval = -EAGAIN; 1691 break; 1692 } 1693 if (signal_pending(current)) { 1694 retval = -ERESTARTSYS; 1695 break; 1696 } 1697 schedule(); 1698 if (!s->busy) { 1699 retval = 0; 1700 break; 1701 } 1702 if (s->busy != file) { 1703 retval = -EACCES; 1704 break; 1705 } 1706 continue; 1707 } 1708 m = copy_to_user(buf, async->prealloc_buf + 1709 async->buf_read_ptr, n); 1710 if (m) { 1711 n -= m; 1712 retval = -EFAULT; 1713 } 1714 1715 comedi_buf_read_alloc(async, n); 1716 comedi_buf_read_free(async, n); 1717 1718 count += n; 1719 nbytes -= n; 1720 1721 buf += n; 1722 break; /* makes device work like a pipe */ 1723 } 1724 if (!(comedi_get_subdevice_runflags(s) & (SRF_ERROR | SRF_RUNNING)) && 1725 async->buf_read_count - async->buf_write_count == 0) { 1726 do_become_nonbusy(dev, s); 1727 } 1728 set_current_state(TASK_RUNNING); 1729 remove_wait_queue(&async->wait_head, &wait); 1730 1731done: 1732 return count ? count : retval; 1733} 1734 1735/* 1736 This function restores a subdevice to an idle state. 1737 */ 1738void do_become_nonbusy(struct comedi_device *dev, struct comedi_subdevice *s) 1739{ 1740 struct comedi_async *async = s->async; 1741 1742 comedi_set_subdevice_runflags(s, SRF_RUNNING, 0); 1743 if (async) { 1744 comedi_reset_async_buf(async); 1745 async->inttrig = NULL; 1746 } else { 1747 printk(KERN_ERR 1748 "BUG: (?) do_become_nonbusy called with async=0\n"); 1749 } 1750 1751 s->busy = NULL; 1752} 1753 1754static int comedi_open(struct inode *inode, struct file *file) 1755{ 1756 const unsigned minor = iminor(inode); 1757 struct comedi_device_file_info *dev_file_info = 1758 comedi_get_device_file_info(minor); 1759 struct comedi_device *dev = 1760 dev_file_info ? dev_file_info->device : NULL; 1761 1762 if (dev == NULL) { 1763 DPRINTK("invalid minor number\n"); 1764 return -ENODEV; 1765 } 1766 1767 /* This is slightly hacky, but we want module autoloading 1768 * to work for root. 1769 * case: user opens device, attached -> ok 1770 * case: user opens device, unattached, in_request_module=0 -> autoload 1771 * case: user opens device, unattached, in_request_module=1 -> fail 1772 * case: root opens device, attached -> ok 1773 * case: root opens device, unattached, in_request_module=1 -> ok 1774 * (typically called from modprobe) 1775 * case: root opens device, unattached, in_request_module=0 -> autoload 1776 * 1777 * The last could be changed to "-> ok", which would deny root 1778 * autoloading. 1779 */ 1780 mutex_lock(&dev->mutex); 1781 if (dev->attached) 1782 goto ok; 1783 if (!capable(CAP_NET_ADMIN) && dev->in_request_module) { 1784 DPRINTK("in request module\n"); 1785 mutex_unlock(&dev->mutex); 1786 return -ENODEV; 1787 } 1788 if (capable(CAP_NET_ADMIN) && dev->in_request_module) 1789 goto ok; 1790 1791 dev->in_request_module = 1; 1792 1793#ifdef CONFIG_KMOD 1794 mutex_unlock(&dev->mutex); 1795 request_module("char-major-%i-%i", COMEDI_MAJOR, dev->minor); 1796 mutex_lock(&dev->mutex); 1797#endif 1798 1799 dev->in_request_module = 0; 1800 1801 if (!dev->attached && !capable(CAP_NET_ADMIN)) { 1802 DPRINTK("not attached and not CAP_NET_ADMIN\n"); 1803 mutex_unlock(&dev->mutex); 1804 return -ENODEV; 1805 } 1806ok: 1807 __module_get(THIS_MODULE); 1808 1809 if (dev->attached) { 1810 if (!try_module_get(dev->driver->module)) { 1811 module_put(THIS_MODULE); 1812 mutex_unlock(&dev->mutex); 1813 return -ENOSYS; 1814 } 1815 } 1816 1817 if (dev->attached && dev->use_count == 0 && dev->open) 1818 dev->open(dev); 1819 1820 dev->use_count++; 1821 1822 mutex_unlock(&dev->mutex); 1823 1824 return 0; 1825} 1826 1827static int comedi_close(struct inode *inode, struct file *file) 1828{ 1829 const unsigned minor = iminor(inode); 1830 struct comedi_device_file_info *dev_file_info = 1831 comedi_get_device_file_info(minor); 1832 struct comedi_device *dev = dev_file_info->device; 1833 struct comedi_subdevice *s = NULL; 1834 int i; 1835 1836 mutex_lock(&dev->mutex); 1837 1838 if (dev->subdevices) { 1839 for (i = 0; i < dev->n_subdevices; i++) { 1840 s = dev->subdevices + i; 1841 1842 if (s->busy == file) 1843 do_cancel(dev, s); 1844 if (s->lock == file) 1845 s->lock = NULL; 1846 } 1847 } 1848 if (dev->attached && dev->use_count == 1 && dev->close) 1849 dev->close(dev); 1850 1851 module_put(THIS_MODULE); 1852 if (dev->attached) 1853 module_put(dev->driver->module); 1854 1855 dev->use_count--; 1856 1857 mutex_unlock(&dev->mutex); 1858 1859 if (file->f_flags & FASYNC) 1860 comedi_fasync(-1, file, 0); 1861 1862 return 0; 1863} 1864 1865static int comedi_fasync(int fd, struct file *file, int on) 1866{ 1867 const unsigned minor = iminor(file->f_dentry->d_inode); 1868 struct comedi_device_file_info *dev_file_info = 1869 comedi_get_device_file_info(minor); 1870 1871 struct comedi_device *dev = dev_file_info->device; 1872 1873 return fasync_helper(fd, file, on, &dev->async_queue); 1874} 1875 1876const struct file_operations comedi_fops = { 1877 .owner = THIS_MODULE, 1878 .unlocked_ioctl = comedi_unlocked_ioctl, 1879 .compat_ioctl = comedi_compat_ioctl, 1880 .open = comedi_open, 1881 .release = comedi_close, 1882 .read = comedi_read, 1883 .write = comedi_write, 1884 .mmap = comedi_mmap, 1885 .poll = comedi_poll, 1886 .fasync = comedi_fasync, 1887}; 1888 1889struct class *comedi_class; 1890static struct cdev comedi_cdev; 1891 1892static void comedi_cleanup_legacy_minors(void) 1893{ 1894 unsigned i; 1895 1896 for (i = 0; i < comedi_num_legacy_minors; i++) 1897 comedi_free_board_minor(i); 1898} 1899 1900static int __init comedi_init(void) 1901{ 1902 int i; 1903 int retval; 1904 1905 printk(KERN_INFO "comedi: version " COMEDI_RELEASE 1906 " - http://www.comedi.org\n"); 1907 1908 if (comedi_num_legacy_minors < 0 || 1909 comedi_num_legacy_minors > COMEDI_NUM_BOARD_MINORS) { 1910 printk(KERN_ERR "comedi: error: invalid value for module " 1911 "parameter \"comedi_num_legacy_minors\". Valid values " 1912 "are 0 through %i.\n", COMEDI_NUM_BOARD_MINORS); 1913 return -EINVAL; 1914 } 1915 1916 /* 1917 * comedi is unusable if both comedi_autoconfig and 1918 * comedi_num_legacy_minors are zero, so we might as well adjust the 1919 * defaults in that case 1920 */ 1921 if (comedi_autoconfig == 0 && comedi_num_legacy_minors == 0) 1922 comedi_num_legacy_minors = 16; 1923 1924 memset(comedi_file_info_table, 0, 1925 sizeof(struct comedi_device_file_info *) * COMEDI_NUM_MINORS); 1926 1927 retval = register_chrdev_region(MKDEV(COMEDI_MAJOR, 0), 1928 COMEDI_NUM_MINORS, "comedi"); 1929 if (retval) 1930 return -EIO; 1931 cdev_init(&comedi_cdev, &comedi_fops); 1932 comedi_cdev.owner = THIS_MODULE; 1933 kobject_set_name(&comedi_cdev.kobj, "comedi"); 1934 if (cdev_add(&comedi_cdev, MKDEV(COMEDI_MAJOR, 0), COMEDI_NUM_MINORS)) { 1935 unregister_chrdev_region(MKDEV(COMEDI_MAJOR, 0), 1936 COMEDI_NUM_MINORS); 1937 return -EIO; 1938 } 1939 comedi_class = class_create(THIS_MODULE, "comedi"); 1940 if (IS_ERR(comedi_class)) { 1941 printk(KERN_ERR "comedi: failed to create class"); 1942 cdev_del(&comedi_cdev); 1943 unregister_chrdev_region(MKDEV(COMEDI_MAJOR, 0), 1944 COMEDI_NUM_MINORS); 1945 return PTR_ERR(comedi_class); 1946 } 1947 1948 /* XXX requires /proc interface */ 1949 comedi_proc_init(); 1950 1951 /* create devices files for legacy/manual use */ 1952 for (i = 0; i < comedi_num_legacy_minors; i++) { 1953 int minor; 1954 minor = comedi_alloc_board_minor(NULL); 1955 if (minor < 0) { 1956 comedi_cleanup_legacy_minors(); 1957 cdev_del(&comedi_cdev); 1958 unregister_chrdev_region(MKDEV(COMEDI_MAJOR, 0), 1959 COMEDI_NUM_MINORS); 1960 return minor; 1961 } 1962 } 1963 1964 return 0; 1965} 1966 1967static void __exit comedi_cleanup(void) 1968{ 1969 int i; 1970 1971 comedi_cleanup_legacy_minors(); 1972 for (i = 0; i < COMEDI_NUM_MINORS; ++i) 1973 BUG_ON(comedi_file_info_table[i]); 1974 1975 class_destroy(comedi_class); 1976 cdev_del(&comedi_cdev); 1977 unregister_chrdev_region(MKDEV(COMEDI_MAJOR, 0), COMEDI_NUM_MINORS); 1978 1979 comedi_proc_cleanup(); 1980} 1981 1982module_init(comedi_init); 1983module_exit(comedi_cleanup); 1984 1985void comedi_error(const struct comedi_device *dev, const char *s) 1986{ 1987 printk(KERN_ERR "comedi%d: %s: %s\n", dev->minor, 1988 dev->driver->driver_name, s); 1989} 1990EXPORT_SYMBOL(comedi_error); 1991 1992void comedi_event(struct comedi_device *dev, struct comedi_subdevice *s) 1993{ 1994 struct comedi_async *async = s->async; 1995 unsigned runflags = 0; 1996 unsigned runflags_mask = 0; 1997 1998 /* DPRINTK("comedi_event 0x%x\n",mask); */ 1999 2000 if ((comedi_get_subdevice_runflags(s) & SRF_RUNNING) == 0) 2001 return; 2002 2003 if (s-> 2004 async->events & (COMEDI_CB_EOA | COMEDI_CB_ERROR | 2005 COMEDI_CB_OVERFLOW)) { 2006 runflags_mask |= SRF_RUNNING; 2007 } 2008 /* remember if an error event has occured, so an error 2009 * can be returned the next time the user does a read() */ 2010 if (s->async->events & (COMEDI_CB_ERROR | COMEDI_CB_OVERFLOW)) { 2011 runflags_mask |= SRF_ERROR; 2012 runflags |= SRF_ERROR; 2013 } 2014 if (runflags_mask) { 2015 /*sets SRF_ERROR and SRF_RUNNING together atomically */ 2016 comedi_set_subdevice_runflags(s, runflags_mask, runflags); 2017 } 2018 2019 if (async->cb_mask & s->async->events) { 2020 if (comedi_get_subdevice_runflags(s) & SRF_USER) { 2021 wake_up_interruptible(&async->wait_head); 2022 if (s->subdev_flags & SDF_CMD_READ) 2023 kill_fasync(&dev->async_queue, SIGIO, POLL_IN); 2024 if (s->subdev_flags & SDF_CMD_WRITE) 2025 kill_fasync(&dev->async_queue, SIGIO, POLL_OUT); 2026 } else { 2027 if (async->cb_func) 2028 async->cb_func(s->async->events, async->cb_arg); 2029 } 2030 } 2031 s->async->events = 0; 2032} 2033EXPORT_SYMBOL(comedi_event); 2034 2035unsigned comedi_get_subdevice_runflags(struct comedi_subdevice *s) 2036{ 2037 unsigned long flags; 2038 unsigned runflags; 2039 2040 spin_lock_irqsave(&s->spin_lock, flags); 2041 runflags = s->runflags; 2042 spin_unlock_irqrestore(&s->spin_lock, flags); 2043 return runflags; 2044} 2045EXPORT_SYMBOL(comedi_get_subdevice_runflags); 2046 2047static int is_device_busy(struct comedi_device *dev) 2048{ 2049 struct comedi_subdevice *s; 2050 int i; 2051 2052 if (!dev->attached) 2053 return 0; 2054 2055 for (i = 0; i < dev->n_subdevices; i++) { 2056 s = dev->subdevices + i; 2057 if (s->busy) 2058 return 1; 2059 if (s->async && s->async->mmap_count) 2060 return 1; 2061 } 2062 2063 return 0; 2064} 2065 2066void comedi_device_init(struct comedi_device *dev) 2067{ 2068 memset(dev, 0, sizeof(struct comedi_device)); 2069 spin_lock_init(&dev->spinlock); 2070 mutex_init(&dev->mutex); 2071 dev->minor = -1; 2072} 2073 2074void comedi_device_cleanup(struct comedi_device *dev) 2075{ 2076 if (dev == NULL) 2077 return; 2078 mutex_lock(&dev->mutex); 2079 comedi_device_detach(dev); 2080 mutex_unlock(&dev->mutex); 2081 mutex_destroy(&dev->mutex); 2082} 2083 2084int comedi_alloc_board_minor(struct device *hardware_device) 2085{ 2086 unsigned long flags; 2087 struct comedi_device_file_info *info; 2088 struct device *csdev; 2089 unsigned i; 2090 int retval; 2091 2092 info = kzalloc(sizeof(struct comedi_device_file_info), GFP_KERNEL); 2093 if (info == NULL) 2094 return -ENOMEM; 2095 info->device = kzalloc(sizeof(struct comedi_device), GFP_KERNEL); 2096 if (info->device == NULL) { 2097 kfree(info); 2098 return -ENOMEM; 2099 } 2100 comedi_device_init(info->device); 2101 spin_lock_irqsave(&comedi_file_info_table_lock, flags); 2102 for (i = 0; i < COMEDI_NUM_BOARD_MINORS; ++i) { 2103 if (comedi_file_info_table[i] == NULL) { 2104 comedi_file_info_table[i] = info; 2105 break; 2106 } 2107 } 2108 spin_unlock_irqrestore(&comedi_file_info_table_lock, flags); 2109 if (i == COMEDI_NUM_BOARD_MINORS) { 2110 comedi_device_cleanup(info->device); 2111 kfree(info->device); 2112 kfree(info); 2113 printk(KERN_ERR 2114 2115 "comedi: error: ran out of minor numbers for board device files.\n"); 2116 return -EBUSY; 2117 } 2118 info->device->minor = i; 2119 csdev = COMEDI_DEVICE_CREATE(comedi_class, NULL, 2120 MKDEV(COMEDI_MAJOR, i), NULL, 2121 hardware_device, "comedi%i", i); 2122 if (!IS_ERR(csdev)) 2123 info->device->class_dev = csdev; 2124 dev_set_drvdata(csdev, info); 2125 retval = device_create_file(csdev, &dev_attr_max_read_buffer_kb); 2126 if (retval) { 2127 printk(KERN_ERR 2128 "comedi: failed to create sysfs attribute file \"%s\".\n", 2129 dev_attr_max_read_buffer_kb.attr.name); 2130 comedi_free_board_minor(i); 2131 return retval; 2132 } 2133 retval = device_create_file(csdev, &dev_attr_read_buffer_kb); 2134 if (retval) { 2135 printk(KERN_ERR 2136 "comedi: failed to create sysfs attribute file \"%s\".\n", 2137 dev_attr_read_buffer_kb.attr.name); 2138 comedi_free_board_minor(i); 2139 return retval; 2140 } 2141 retval = device_create_file(csdev, &dev_attr_max_write_buffer_kb); 2142 if (retval) { 2143 printk(KERN_ERR 2144 "comedi: failed to create sysfs attribute file \"%s\".\n", 2145 dev_attr_max_write_buffer_kb.attr.name); 2146 comedi_free_board_minor(i); 2147 return retval; 2148 } 2149 retval = device_create_file(csdev, &dev_attr_write_buffer_kb); 2150 if (retval) { 2151 printk(KERN_ERR 2152 "comedi: failed to create sysfs attribute file \"%s\".\n", 2153 dev_attr_write_buffer_kb.attr.name); 2154 comedi_free_board_minor(i); 2155 return retval; 2156 } 2157 return i; 2158} 2159 2160void comedi_free_board_minor(unsigned minor) 2161{ 2162 unsigned long flags; 2163 struct comedi_device_file_info *info; 2164 2165 BUG_ON(minor >= COMEDI_NUM_BOARD_MINORS); 2166 spin_lock_irqsave(&comedi_file_info_table_lock, flags); 2167 info = comedi_file_info_table[minor]; 2168 comedi_file_info_table[minor] = NULL; 2169 spin_unlock_irqrestore(&comedi_file_info_table_lock, flags); 2170 2171 if (info) { 2172 struct comedi_device *dev = info->device; 2173 if (dev) { 2174 if (dev->class_dev) { 2175 device_destroy(comedi_class, 2176 MKDEV(COMEDI_MAJOR, dev->minor)); 2177 } 2178 comedi_device_cleanup(dev); 2179 kfree(dev); 2180 } 2181 kfree(info); 2182 } 2183} 2184 2185int comedi_alloc_subdevice_minor(struct comedi_device *dev, 2186 struct comedi_subdevice *s) 2187{ 2188 unsigned long flags; 2189 struct comedi_device_file_info *info; 2190 struct device *csdev; 2191 unsigned i; 2192 int retval; 2193 2194 info = kmalloc(sizeof(struct comedi_device_file_info), GFP_KERNEL); 2195 if (info == NULL) 2196 return -ENOMEM; 2197 info->device = dev; 2198 info->read_subdevice = s; 2199 info->write_subdevice = s; 2200 spin_lock_irqsave(&comedi_file_info_table_lock, flags); 2201 for (i = COMEDI_FIRST_SUBDEVICE_MINOR; i < COMEDI_NUM_MINORS; ++i) { 2202 if (comedi_file_info_table[i] == NULL) { 2203 comedi_file_info_table[i] = info; 2204 break; 2205 } 2206 } 2207 spin_unlock_irqrestore(&comedi_file_info_table_lock, flags); 2208 if (i == COMEDI_NUM_MINORS) { 2209 kfree(info); 2210 printk(KERN_ERR 2211 "comedi: error: ran out of minor numbers for board device files.\n"); 2212 return -EBUSY; 2213 } 2214 s->minor = i; 2215 csdev = COMEDI_DEVICE_CREATE(comedi_class, dev->class_dev, 2216 MKDEV(COMEDI_MAJOR, i), NULL, NULL, 2217 "comedi%i_subd%i", dev->minor, 2218 (int)(s - dev->subdevices)); 2219 if (!IS_ERR(csdev)) 2220 s->class_dev = csdev; 2221 dev_set_drvdata(csdev, info); 2222 retval = device_create_file(csdev, &dev_attr_max_read_buffer_kb); 2223 if (retval) { 2224 printk(KERN_ERR 2225 "comedi: failed to create sysfs attribute file \"%s\".\n", 2226 dev_attr_max_read_buffer_kb.attr.name); 2227 comedi_free_subdevice_minor(s); 2228 return retval; 2229 } 2230 retval = device_create_file(csdev, &dev_attr_read_buffer_kb); 2231 if (retval) { 2232 printk(KERN_ERR 2233 "comedi: failed to create sysfs attribute file \"%s\".\n", 2234 dev_attr_read_buffer_kb.attr.name); 2235 comedi_free_subdevice_minor(s); 2236 return retval; 2237 } 2238 retval = device_create_file(csdev, &dev_attr_max_write_buffer_kb); 2239 if (retval) { 2240 printk(KERN_ERR 2241 "comedi: failed to create sysfs attribute file \"%s\".\n", 2242 dev_attr_max_write_buffer_kb.attr.name); 2243 comedi_free_subdevice_minor(s); 2244 return retval; 2245 } 2246 retval = device_create_file(csdev, &dev_attr_write_buffer_kb); 2247 if (retval) { 2248 printk(KERN_ERR 2249 "comedi: failed to create sysfs attribute file \"%s\".\n", 2250 dev_attr_write_buffer_kb.attr.name); 2251 comedi_free_subdevice_minor(s); 2252 return retval; 2253 } 2254 return i; 2255} 2256 2257void comedi_free_subdevice_minor(struct comedi_subdevice *s) 2258{ 2259 unsigned long flags; 2260 struct comedi_device_file_info *info; 2261 2262 if (s == NULL) 2263 return; 2264 if (s->minor < 0) 2265 return; 2266 2267 BUG_ON(s->minor >= COMEDI_NUM_MINORS); 2268 BUG_ON(s->minor < COMEDI_FIRST_SUBDEVICE_MINOR); 2269 2270 spin_lock_irqsave(&comedi_file_info_table_lock, flags); 2271 info = comedi_file_info_table[s->minor]; 2272 comedi_file_info_table[s->minor] = NULL; 2273 spin_unlock_irqrestore(&comedi_file_info_table_lock, flags); 2274 2275 if (s->class_dev) { 2276 device_destroy(comedi_class, MKDEV(COMEDI_MAJOR, s->minor)); 2277 s->class_dev = NULL; 2278 } 2279 kfree(info); 2280} 2281 2282struct comedi_device_file_info *comedi_get_device_file_info(unsigned minor) 2283{ 2284 unsigned long flags; 2285 struct comedi_device_file_info *info; 2286 2287 BUG_ON(minor >= COMEDI_NUM_MINORS); 2288 spin_lock_irqsave(&comedi_file_info_table_lock, flags); 2289 info = comedi_file_info_table[minor]; 2290 spin_unlock_irqrestore(&comedi_file_info_table_lock, flags); 2291 return info; 2292} 2293EXPORT_SYMBOL_GPL(comedi_get_device_file_info); 2294 2295static int resize_async_buffer(struct comedi_device *dev, 2296 struct comedi_subdevice *s, 2297 struct comedi_async *async, unsigned new_size) 2298{ 2299 int retval; 2300 2301 if (new_size > async->max_bufsize) 2302 return -EPERM; 2303 2304 if (s->busy) { 2305 DPRINTK("subdevice is busy, cannot resize buffer\n"); 2306 return -EBUSY; 2307 } 2308 if (async->mmap_count) { 2309 DPRINTK("subdevice is mmapped, cannot resize buffer\n"); 2310 return -EBUSY; 2311 } 2312 2313 if (!async->prealloc_buf) 2314 return -EINVAL; 2315 2316 /* make sure buffer is an integral number of pages 2317 * (we round up) */ 2318 new_size = (new_size + PAGE_SIZE - 1) & PAGE_MASK; 2319 2320 retval = comedi_buf_alloc(dev, s, new_size); 2321 if (retval < 0) 2322 return retval; 2323 2324 if (s->buf_change) { 2325 retval = s->buf_change(dev, s, new_size); 2326 if (retval < 0) 2327 return retval; 2328 } 2329 2330 DPRINTK("comedi%i subd %d buffer resized to %i bytes\n", 2331 dev->minor, (int)(s - dev->subdevices), async->prealloc_bufsz); 2332 return 0; 2333} 2334 2335/* sysfs attribute files */ 2336 2337static const unsigned bytes_per_kibi = 1024; 2338 2339static ssize_t show_max_read_buffer_kb(struct device *dev, 2340 struct device_attribute *attr, char *buf) 2341{ 2342 ssize_t retval; 2343 struct comedi_device_file_info *info = dev_get_drvdata(dev); 2344 unsigned max_buffer_size_kb = 0; 2345 struct comedi_subdevice *const read_subdevice = 2346 comedi_get_read_subdevice(info); 2347 2348 mutex_lock(&info->device->mutex); 2349 if (read_subdevice && 2350 (read_subdevice->subdev_flags & SDF_CMD_READ) && 2351 read_subdevice->async) { 2352 max_buffer_size_kb = read_subdevice->async->max_bufsize / 2353 bytes_per_kibi; 2354 } 2355 retval = snprintf(buf, PAGE_SIZE, "%i\n", max_buffer_size_kb); 2356 mutex_unlock(&info->device->mutex); 2357 2358 return retval; 2359} 2360 2361static ssize_t store_max_read_buffer_kb(struct device *dev, 2362 struct device_attribute *attr, 2363 const char *buf, size_t count) 2364{ 2365 struct comedi_device_file_info *info = dev_get_drvdata(dev); 2366 unsigned long new_max_size_kb; 2367 uint64_t new_max_size; 2368 struct comedi_subdevice *const read_subdevice = 2369 comedi_get_read_subdevice(info); 2370 2371 if (strict_strtoul(buf, 10, &new_max_size_kb)) 2372 return -EINVAL; 2373 if (new_max_size_kb != (uint32_t) new_max_size_kb) 2374 return -EINVAL; 2375 new_max_size = ((uint64_t) new_max_size_kb) * bytes_per_kibi; 2376 if (new_max_size != (uint32_t) new_max_size) 2377 return -EINVAL; 2378 2379 mutex_lock(&info->device->mutex); 2380 if (read_subdevice == NULL || 2381 (read_subdevice->subdev_flags & SDF_CMD_READ) == 0 || 2382 read_subdevice->async == NULL) { 2383 mutex_unlock(&info->device->mutex); 2384 return -EINVAL; 2385 } 2386 read_subdevice->async->max_bufsize = new_max_size; 2387 mutex_unlock(&info->device->mutex); 2388 2389 return count; 2390} 2391 2392static struct device_attribute dev_attr_max_read_buffer_kb = { 2393 .attr = { 2394 .name = "max_read_buffer_kb", 2395 .mode = S_IRUGO | S_IWUSR}, 2396 .show = &show_max_read_buffer_kb, 2397 .store = &store_max_read_buffer_kb 2398}; 2399 2400static ssize_t show_read_buffer_kb(struct device *dev, 2401 struct device_attribute *attr, char *buf) 2402{ 2403 ssize_t retval; 2404 struct comedi_device_file_info *info = dev_get_drvdata(dev); 2405 unsigned buffer_size_kb = 0; 2406 struct comedi_subdevice *const read_subdevice = 2407 comedi_get_read_subdevice(info); 2408 2409 mutex_lock(&info->device->mutex); 2410 if (read_subdevice && 2411 (read_subdevice->subdev_flags & SDF_CMD_READ) && 2412 read_subdevice->async) { 2413 buffer_size_kb = read_subdevice->async->prealloc_bufsz / 2414 bytes_per_kibi; 2415 } 2416 retval = snprintf(buf, PAGE_SIZE, "%i\n", buffer_size_kb); 2417 mutex_unlock(&info->device->mutex); 2418 2419 return retval; 2420} 2421 2422static ssize_t store_read_buffer_kb(struct device *dev, 2423 struct device_attribute *attr, 2424 const char *buf, size_t count) 2425{ 2426 struct comedi_device_file_info *info = dev_get_drvdata(dev); 2427 unsigned long new_size_kb; 2428 uint64_t new_size; 2429 int retval; 2430 struct comedi_subdevice *const read_subdevice = 2431 comedi_get_read_subdevice(info); 2432 2433 if (strict_strtoul(buf, 10, &new_size_kb)) 2434 return -EINVAL; 2435 if (new_size_kb != (uint32_t) new_size_kb) 2436 return -EINVAL; 2437 new_size = ((uint64_t) new_size_kb) * bytes_per_kibi; 2438 if (new_size != (uint32_t) new_size) 2439 return -EINVAL; 2440 2441 mutex_lock(&info->device->mutex); 2442 if (read_subdevice == NULL || 2443 (read_subdevice->subdev_flags & SDF_CMD_READ) == 0 || 2444 read_subdevice->async == NULL) { 2445 mutex_unlock(&info->device->mutex); 2446 return -EINVAL; 2447 } 2448 retval = resize_async_buffer(info->device, read_subdevice, 2449 read_subdevice->async, new_size); 2450 mutex_unlock(&info->device->mutex); 2451 2452 if (retval < 0) 2453 return retval; 2454 return count; 2455} 2456 2457static struct device_attribute dev_attr_read_buffer_kb = { 2458 .attr = { 2459 .name = "read_buffer_kb", 2460 .mode = S_IRUGO | S_IWUSR | S_IWGRP}, 2461 .show = &show_read_buffer_kb, 2462 .store = &store_read_buffer_kb 2463}; 2464 2465static ssize_t show_max_write_buffer_kb(struct device *dev, 2466 struct device_attribute *attr, 2467 char *buf) 2468{ 2469 ssize_t retval; 2470 struct comedi_device_file_info *info = dev_get_drvdata(dev); 2471 unsigned max_buffer_size_kb = 0; 2472 struct comedi_subdevice *const write_subdevice = 2473 comedi_get_write_subdevice(info); 2474 2475 mutex_lock(&info->device->mutex); 2476 if (write_subdevice && 2477 (write_subdevice->subdev_flags & SDF_CMD_WRITE) && 2478 write_subdevice->async) { 2479 max_buffer_size_kb = write_subdevice->async->max_bufsize / 2480 bytes_per_kibi; 2481 } 2482 retval = snprintf(buf, PAGE_SIZE, "%i\n", max_buffer_size_kb); 2483 mutex_unlock(&info->device->mutex); 2484 2485 return retval; 2486} 2487 2488static ssize_t store_max_write_buffer_kb(struct device *dev, 2489 struct device_attribute *attr, 2490 const char *buf, size_t count) 2491{ 2492 struct comedi_device_file_info *info = dev_get_drvdata(dev); 2493 unsigned long new_max_size_kb; 2494 uint64_t new_max_size; 2495 struct comedi_subdevice *const write_subdevice = 2496 comedi_get_write_subdevice(info); 2497 2498 if (strict_strtoul(buf, 10, &new_max_size_kb)) 2499 return -EINVAL; 2500 if (new_max_size_kb != (uint32_t) new_max_size_kb) 2501 return -EINVAL; 2502 new_max_size = ((uint64_t) new_max_size_kb) * bytes_per_kibi; 2503 if (new_max_size != (uint32_t) new_max_size) 2504 return -EINVAL; 2505 2506 mutex_lock(&info->device->mutex); 2507 if (write_subdevice == NULL || 2508 (write_subdevice->subdev_flags & SDF_CMD_WRITE) == 0 || 2509 write_subdevice->async == NULL) { 2510 mutex_unlock(&info->device->mutex); 2511 return -EINVAL; 2512 } 2513 write_subdevice->async->max_bufsize = new_max_size; 2514 mutex_unlock(&info->device->mutex); 2515 2516 return count; 2517} 2518 2519static struct device_attribute dev_attr_max_write_buffer_kb = { 2520 .attr = { 2521 .name = "max_write_buffer_kb", 2522 .mode = S_IRUGO | S_IWUSR}, 2523 .show = &show_max_write_buffer_kb, 2524 .store = &store_max_write_buffer_kb 2525}; 2526 2527static ssize_t show_write_buffer_kb(struct device *dev, 2528 struct device_attribute *attr, char *buf) 2529{ 2530 ssize_t retval; 2531 struct comedi_device_file_info *info = dev_get_drvdata(dev); 2532 unsigned buffer_size_kb = 0; 2533 struct comedi_subdevice *const write_subdevice = 2534 comedi_get_write_subdevice(info); 2535 2536 mutex_lock(&info->device->mutex); 2537 if (write_subdevice && 2538 (write_subdevice->subdev_flags & SDF_CMD_WRITE) && 2539 write_subdevice->async) { 2540 buffer_size_kb = write_subdevice->async->prealloc_bufsz / 2541 bytes_per_kibi; 2542 } 2543 retval = snprintf(buf, PAGE_SIZE, "%i\n", buffer_size_kb); 2544 mutex_unlock(&info->device->mutex); 2545 2546 return retval; 2547} 2548 2549static ssize_t store_write_buffer_kb(struct device *dev, 2550 struct device_attribute *attr, 2551 const char *buf, size_t count) 2552{ 2553 struct comedi_device_file_info *info = dev_get_drvdata(dev); 2554 unsigned long new_size_kb; 2555 uint64_t new_size; 2556 int retval; 2557 struct comedi_subdevice *const write_subdevice = 2558 comedi_get_write_subdevice(info); 2559 2560 if (strict_strtoul(buf, 10, &new_size_kb)) 2561 return -EINVAL; 2562 if (new_size_kb != (uint32_t) new_size_kb) 2563 return -EINVAL; 2564 new_size = ((uint64_t) new_size_kb) * bytes_per_kibi; 2565 if (new_size != (uint32_t) new_size) 2566 return -EINVAL; 2567 2568 mutex_lock(&info->device->mutex); 2569 if (write_subdevice == NULL || 2570 (write_subdevice->subdev_flags & SDF_CMD_WRITE) == 0 || 2571 write_subdevice->async == NULL) { 2572 mutex_unlock(&info->device->mutex); 2573 return -EINVAL; 2574 } 2575 retval = resize_async_buffer(info->device, write_subdevice, 2576 write_subdevice->async, new_size); 2577 mutex_unlock(&info->device->mutex); 2578 2579 if (retval < 0) 2580 return retval; 2581 return count; 2582} 2583 2584static struct device_attribute dev_attr_write_buffer_kb = { 2585 .attr = { 2586 .name = "write_buffer_kb", 2587 .mode = S_IRUGO | S_IWUSR | S_IWGRP}, 2588 .show = &show_write_buffer_kb, 2589 .store = &store_write_buffer_kb 2590}; 2591