David Schleef | ed9eccb | 2008-11-04 20:29:31 -0800 | [diff] [blame^] | 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 | |
| 48 | #include <asm/io.h> |
| 49 | #include <asm/uaccess.h> |
| 50 | |
| 51 | //#include "kvmem.h" |
| 52 | |
| 53 | MODULE_AUTHOR("http://www.comedi.org"); |
| 54 | MODULE_DESCRIPTION("Comedi core module"); |
| 55 | MODULE_LICENSE("GPL"); |
| 56 | |
| 57 | #ifdef CONFIG_COMEDI_DEBUG |
| 58 | int comedi_debug; |
| 59 | module_param(comedi_debug, int, 0644); |
| 60 | #endif |
| 61 | |
| 62 | static DEFINE_SPINLOCK(comedi_file_info_table_lock); |
| 63 | static struct comedi_device_file_info* comedi_file_info_table[COMEDI_NUM_MINORS]; |
| 64 | |
| 65 | static int do_devconfig_ioctl(comedi_device * dev, comedi_devconfig * arg); |
| 66 | static int do_bufconfig_ioctl(comedi_device * dev, void *arg); |
| 67 | static int do_devinfo_ioctl(comedi_device * dev, comedi_devinfo * arg, |
| 68 | struct file *file); |
| 69 | static int do_subdinfo_ioctl(comedi_device * dev, comedi_subdinfo * arg, |
| 70 | void *file); |
| 71 | static int do_chaninfo_ioctl(comedi_device * dev, comedi_chaninfo * arg); |
| 72 | static int do_bufinfo_ioctl(comedi_device * dev, void *arg); |
| 73 | static int do_cmd_ioctl(comedi_device * dev, void *arg, void *file); |
| 74 | static int do_lock_ioctl(comedi_device * dev, unsigned int arg, void *file); |
| 75 | static int do_unlock_ioctl(comedi_device * dev, unsigned int arg, void *file); |
| 76 | static int do_cancel_ioctl(comedi_device * dev, unsigned int arg, void *file); |
| 77 | static int do_cmdtest_ioctl(comedi_device * dev, void *arg, void *file); |
| 78 | static int do_insnlist_ioctl(comedi_device * dev, void *arg, void *file); |
| 79 | static int do_insn_ioctl(comedi_device * dev, void *arg, void *file); |
| 80 | static int do_poll_ioctl(comedi_device * dev, unsigned int subd, void *file); |
| 81 | |
| 82 | void do_become_nonbusy(comedi_device * dev, comedi_subdevice * s); |
| 83 | static int do_cancel(comedi_device * dev, comedi_subdevice * s); |
| 84 | |
| 85 | static int comedi_fasync(int fd, struct file *file, int on); |
| 86 | |
| 87 | static int is_device_busy(comedi_device * dev); |
| 88 | |
| 89 | #ifdef HAVE_UNLOCKED_IOCTL |
| 90 | static long comedi_unlocked_ioctl(struct file *file, unsigned int cmd, |
| 91 | unsigned long arg) |
| 92 | #else |
| 93 | static int comedi_ioctl(struct inode *inode, struct file *file, |
| 94 | unsigned int cmd, unsigned long arg) |
| 95 | #endif |
| 96 | { |
| 97 | const unsigned minor = iminor(file->f_dentry->d_inode); |
| 98 | struct comedi_device_file_info *dev_file_info = comedi_get_device_file_info(minor); |
| 99 | comedi_device *dev = dev_file_info->device; |
| 100 | int rc; |
| 101 | |
| 102 | mutex_lock(&dev->mutex); |
| 103 | |
| 104 | /* Device config is special, because it must work on |
| 105 | * an unconfigured device. */ |
| 106 | if (cmd == COMEDI_DEVCONFIG) { |
| 107 | rc = do_devconfig_ioctl(dev, (void *)arg); |
| 108 | goto done; |
| 109 | } |
| 110 | |
| 111 | if (!dev->attached) { |
| 112 | DPRINTK("no driver configured on /dev/comedi%i\n", dev->minor); |
| 113 | rc = -ENODEV; |
| 114 | goto done; |
| 115 | } |
| 116 | |
| 117 | switch (cmd) { |
| 118 | case COMEDI_BUFCONFIG: |
| 119 | rc = do_bufconfig_ioctl(dev, (void *)arg); |
| 120 | break; |
| 121 | case COMEDI_DEVINFO: |
| 122 | rc = do_devinfo_ioctl(dev, (void *)arg, file); |
| 123 | break; |
| 124 | case COMEDI_SUBDINFO: |
| 125 | rc = do_subdinfo_ioctl(dev, (void *)arg, file); |
| 126 | break; |
| 127 | case COMEDI_CHANINFO: |
| 128 | rc = do_chaninfo_ioctl(dev, (void *)arg); |
| 129 | break; |
| 130 | case COMEDI_RANGEINFO: |
| 131 | rc = do_rangeinfo_ioctl(dev, (void *)arg); |
| 132 | break; |
| 133 | case COMEDI_BUFINFO: |
| 134 | rc = do_bufinfo_ioctl(dev, (void *)arg); |
| 135 | break; |
| 136 | case COMEDI_LOCK: |
| 137 | rc = do_lock_ioctl(dev, arg, file); |
| 138 | break; |
| 139 | case COMEDI_UNLOCK: |
| 140 | rc = do_unlock_ioctl(dev, arg, file); |
| 141 | break; |
| 142 | case COMEDI_CANCEL: |
| 143 | rc = do_cancel_ioctl(dev, arg, file); |
| 144 | break; |
| 145 | case COMEDI_CMD: |
| 146 | rc = do_cmd_ioctl(dev, (void *)arg, file); |
| 147 | break; |
| 148 | case COMEDI_CMDTEST: |
| 149 | rc = do_cmdtest_ioctl(dev, (void *)arg, file); |
| 150 | break; |
| 151 | case COMEDI_INSNLIST: |
| 152 | rc = do_insnlist_ioctl(dev, (void *)arg, file); |
| 153 | break; |
| 154 | case COMEDI_INSN: |
| 155 | rc = do_insn_ioctl(dev, (void *)arg, file); |
| 156 | break; |
| 157 | case COMEDI_POLL: |
| 158 | rc = do_poll_ioctl(dev, arg, file); |
| 159 | break; |
| 160 | default: |
| 161 | rc = -ENOTTY; |
| 162 | break; |
| 163 | } |
| 164 | |
| 165 | done: |
| 166 | mutex_unlock(&dev->mutex); |
| 167 | return rc; |
| 168 | } |
| 169 | |
| 170 | /* |
| 171 | COMEDI_DEVCONFIG |
| 172 | device config ioctl |
| 173 | |
| 174 | arg: |
| 175 | pointer to devconfig structure |
| 176 | |
| 177 | reads: |
| 178 | devconfig structure at arg |
| 179 | |
| 180 | writes: |
| 181 | none |
| 182 | */ |
| 183 | static int do_devconfig_ioctl(comedi_device * dev, comedi_devconfig * arg) |
| 184 | { |
| 185 | comedi_devconfig it; |
| 186 | int ret; |
| 187 | unsigned char *aux_data = NULL; |
| 188 | int aux_len; |
| 189 | |
| 190 | if (!capable(CAP_SYS_ADMIN)) |
| 191 | return -EPERM; |
| 192 | |
| 193 | if (arg == NULL) { |
| 194 | if (is_device_busy(dev)) |
| 195 | return -EBUSY; |
| 196 | if(dev->attached) |
| 197 | { |
| 198 | struct module *driver_module = dev->driver->module; |
| 199 | comedi_device_detach(dev); |
| 200 | module_put(driver_module); |
| 201 | } |
| 202 | return 0; |
| 203 | } |
| 204 | |
| 205 | if (copy_from_user(&it, arg, sizeof(comedi_devconfig))) |
| 206 | return -EFAULT; |
| 207 | |
| 208 | it.board_name[COMEDI_NAMELEN - 1] = 0; |
| 209 | |
| 210 | if (comedi_aux_data(it.options, 0) && |
| 211 | it.options[COMEDI_DEVCONF_AUX_DATA_LENGTH]) { |
| 212 | int bit_shift; |
| 213 | aux_len = it.options[COMEDI_DEVCONF_AUX_DATA_LENGTH]; |
| 214 | if (aux_len < 0) |
| 215 | return -EFAULT; |
| 216 | |
| 217 | aux_data = vmalloc(aux_len); |
| 218 | if (!aux_data) |
| 219 | return -ENOMEM; |
| 220 | |
| 221 | if (copy_from_user(aux_data, |
| 222 | comedi_aux_data(it.options, 0), aux_len)) { |
| 223 | vfree(aux_data); |
| 224 | return -EFAULT; |
| 225 | } |
| 226 | it.options[COMEDI_DEVCONF_AUX_DATA_LO] = |
| 227 | (unsigned long)aux_data; |
| 228 | if (sizeof(void *) > sizeof(int)) { |
| 229 | bit_shift = sizeof(int) * 8; |
| 230 | it.options[COMEDI_DEVCONF_AUX_DATA_HI] = |
| 231 | ((unsigned long)aux_data) >> bit_shift; |
| 232 | } else |
| 233 | it.options[COMEDI_DEVCONF_AUX_DATA_HI] = 0; |
| 234 | } |
| 235 | |
| 236 | ret = comedi_device_attach(dev, &it); |
| 237 | if(ret == 0) |
| 238 | { |
| 239 | if(!try_module_get(dev->driver->module)) { |
| 240 | comedi_device_detach(dev); |
| 241 | return -ENOSYS; |
| 242 | } |
| 243 | } |
| 244 | |
| 245 | if (aux_data) |
| 246 | vfree(aux_data); |
| 247 | |
| 248 | return ret; |
| 249 | } |
| 250 | |
| 251 | /* |
| 252 | COMEDI_BUFCONFIG |
| 253 | buffer configuration ioctl |
| 254 | |
| 255 | arg: |
| 256 | pointer to bufconfig structure |
| 257 | |
| 258 | reads: |
| 259 | bufconfig at arg |
| 260 | |
| 261 | writes: |
| 262 | modified bufconfig at arg |
| 263 | |
| 264 | */ |
| 265 | static int do_bufconfig_ioctl(comedi_device * dev, void *arg) |
| 266 | { |
| 267 | comedi_bufconfig bc; |
| 268 | comedi_async *async; |
| 269 | comedi_subdevice *s; |
| 270 | int ret = 0; |
| 271 | |
| 272 | if (copy_from_user(&bc, arg, sizeof(comedi_bufconfig))) |
| 273 | return -EFAULT; |
| 274 | |
| 275 | if (bc.subdevice >= dev->n_subdevices || bc.subdevice < 0) |
| 276 | return -EINVAL; |
| 277 | |
| 278 | s = dev->subdevices + bc.subdevice; |
| 279 | async = s->async; |
| 280 | |
| 281 | if (!async) { |
| 282 | DPRINTK("subdevice does not have async capability\n"); |
| 283 | bc.size = 0; |
| 284 | bc.maximum_size = 0; |
| 285 | goto copyback; |
| 286 | } |
| 287 | |
| 288 | if (bc.maximum_size) { |
| 289 | if (!capable(CAP_SYS_ADMIN)) |
| 290 | return -EPERM; |
| 291 | |
| 292 | async->max_bufsize = bc.maximum_size; |
| 293 | } |
| 294 | |
| 295 | if (bc.size) { |
| 296 | if (bc.size > async->max_bufsize) |
| 297 | return -EPERM; |
| 298 | |
| 299 | if (s->busy) { |
| 300 | DPRINTK("subdevice is busy, cannot resize buffer\n"); |
| 301 | return -EBUSY; |
| 302 | } |
| 303 | if (async->mmap_count) { |
| 304 | DPRINTK("subdevice is mmapped, cannot resize buffer\n"); |
| 305 | return -EBUSY; |
| 306 | } |
| 307 | |
| 308 | if (!async->prealloc_buf) |
| 309 | return -EINVAL; |
| 310 | |
| 311 | /* make sure buffer is an integral number of pages |
| 312 | * (we round up) */ |
| 313 | bc.size = (bc.size + PAGE_SIZE - 1) & PAGE_MASK; |
| 314 | |
| 315 | ret = comedi_buf_alloc(dev, s, bc.size); |
| 316 | if (ret < 0) |
| 317 | return ret; |
| 318 | |
| 319 | if (s->buf_change) { |
| 320 | ret = s->buf_change(dev, s, bc.size); |
| 321 | if (ret < 0) |
| 322 | return ret; |
| 323 | } |
| 324 | |
| 325 | DPRINTK("comedi%i subd %d buffer resized to %i bytes\n", |
| 326 | dev->minor, bc.subdevice, async->prealloc_bufsz); |
| 327 | } |
| 328 | |
| 329 | bc.size = async->prealloc_bufsz; |
| 330 | bc.maximum_size = async->max_bufsize; |
| 331 | |
| 332 | copyback: |
| 333 | if (copy_to_user(arg, &bc, sizeof(comedi_bufconfig))) |
| 334 | return -EFAULT; |
| 335 | |
| 336 | return 0; |
| 337 | } |
| 338 | |
| 339 | /* |
| 340 | COMEDI_DEVINFO |
| 341 | device info ioctl |
| 342 | |
| 343 | arg: |
| 344 | pointer to devinfo structure |
| 345 | |
| 346 | reads: |
| 347 | none |
| 348 | |
| 349 | writes: |
| 350 | devinfo structure |
| 351 | |
| 352 | */ |
| 353 | static int do_devinfo_ioctl(comedi_device * dev, comedi_devinfo * arg, |
| 354 | struct file *file) |
| 355 | { |
| 356 | comedi_devinfo devinfo; |
| 357 | const unsigned minor = iminor(file->f_dentry->d_inode); |
| 358 | struct comedi_device_file_info *dev_file_info = comedi_get_device_file_info(minor); |
| 359 | comedi_subdevice *read_subdev = comedi_get_read_subdevice(dev_file_info); |
| 360 | comedi_subdevice *write_subdev = comedi_get_write_subdevice(dev_file_info); |
| 361 | |
| 362 | memset(&devinfo, 0, sizeof(devinfo)); |
| 363 | |
| 364 | /* fill devinfo structure */ |
| 365 | devinfo.version_code = COMEDI_VERSION_CODE; |
| 366 | devinfo.n_subdevs = dev->n_subdevices; |
| 367 | memcpy(devinfo.driver_name, dev->driver->driver_name, COMEDI_NAMELEN); |
| 368 | memcpy(devinfo.board_name, dev->board_name, COMEDI_NAMELEN); |
| 369 | |
| 370 | if (read_subdev) { |
| 371 | devinfo.read_subdevice = read_subdev - dev->subdevices; |
| 372 | } else { |
| 373 | devinfo.read_subdevice = -1; |
| 374 | } |
| 375 | if (write_subdev) { |
| 376 | devinfo.write_subdevice = write_subdev - dev->subdevices; |
| 377 | } else { |
| 378 | devinfo.write_subdevice = -1; |
| 379 | } |
| 380 | |
| 381 | if (copy_to_user(arg, &devinfo, sizeof(comedi_devinfo))) |
| 382 | return -EFAULT; |
| 383 | |
| 384 | return 0; |
| 385 | } |
| 386 | |
| 387 | /* |
| 388 | COMEDI_SUBDINFO |
| 389 | subdevice info ioctl |
| 390 | |
| 391 | arg: |
| 392 | pointer to array of subdevice info structures |
| 393 | |
| 394 | reads: |
| 395 | none |
| 396 | |
| 397 | writes: |
| 398 | array of subdevice info structures at arg |
| 399 | |
| 400 | */ |
| 401 | static int do_subdinfo_ioctl(comedi_device * dev, comedi_subdinfo * arg, |
| 402 | void *file) |
| 403 | { |
| 404 | int ret, i; |
| 405 | comedi_subdinfo *tmp, *us; |
| 406 | comedi_subdevice *s; |
| 407 | |
| 408 | tmp = kcalloc(dev->n_subdevices, sizeof(comedi_subdinfo), 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-> |
| 429 | range_table->length); |
| 430 | } else { |
| 431 | us->range_type = 0; /* XXX */ |
| 432 | } |
| 433 | us->flags = s->flags; |
| 434 | |
| 435 | if (s->busy) |
| 436 | us->subd_flags |= SDF_BUSY; |
| 437 | if (s->busy == file) |
| 438 | us->subd_flags |= SDF_BUSY_OWNER; |
| 439 | if (s->lock) |
| 440 | us->subd_flags |= SDF_LOCKED; |
| 441 | if (s->lock == file) |
| 442 | us->subd_flags |= SDF_LOCK_OWNER; |
| 443 | if (!s->maxdata && s->maxdata_list) |
| 444 | us->subd_flags |= SDF_MAXDATA; |
| 445 | if (s->flaglist) |
| 446 | us->subd_flags |= SDF_FLAGS; |
| 447 | if (s->range_table_list) |
| 448 | us->subd_flags |= SDF_RANGETYPE; |
| 449 | if (s->do_cmd) |
| 450 | us->subd_flags |= SDF_CMD; |
| 451 | |
| 452 | if (s->insn_bits != &insn_inval) |
| 453 | us->insn_bits_support = COMEDI_SUPPORTED; |
| 454 | else |
| 455 | us->insn_bits_support = COMEDI_UNSUPPORTED; |
| 456 | |
| 457 | us->settling_time_0 = s->settling_time_0; |
| 458 | } |
| 459 | |
| 460 | ret = copy_to_user(arg, tmp, |
| 461 | dev->n_subdevices * sizeof(comedi_subdinfo)); |
| 462 | |
| 463 | kfree(tmp); |
| 464 | |
| 465 | return ret ? -EFAULT : 0; |
| 466 | } |
| 467 | |
| 468 | /* |
| 469 | COMEDI_CHANINFO |
| 470 | subdevice info ioctl |
| 471 | |
| 472 | arg: |
| 473 | pointer to chaninfo structure |
| 474 | |
| 475 | reads: |
| 476 | chaninfo structure at arg |
| 477 | |
| 478 | writes: |
| 479 | arrays at elements of chaninfo structure |
| 480 | |
| 481 | */ |
| 482 | static int do_chaninfo_ioctl(comedi_device * dev, comedi_chaninfo * arg) |
| 483 | { |
| 484 | comedi_subdevice *s; |
| 485 | comedi_chaninfo it; |
| 486 | |
| 487 | if (copy_from_user(&it, arg, sizeof(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(lsampl_t))) |
| 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(copy_to_user(it.rangelist,s->range_type_list,s->n_chan*sizeof(unsigned int))) |
| 523 | // return -EFAULT; |
| 524 | } |
| 525 | |
| 526 | return 0; |
| 527 | } |
| 528 | |
| 529 | /* |
| 530 | COMEDI_BUFINFO |
| 531 | buffer information ioctl |
| 532 | |
| 533 | arg: |
| 534 | pointer to bufinfo structure |
| 535 | |
| 536 | reads: |
| 537 | bufinfo at arg |
| 538 | |
| 539 | writes: |
| 540 | modified bufinfo at arg |
| 541 | |
| 542 | */ |
| 543 | static int do_bufinfo_ioctl(comedi_device * dev, void *arg) |
| 544 | { |
| 545 | comedi_bufinfo bi; |
| 546 | comedi_subdevice *s; |
| 547 | comedi_async *async; |
| 548 | |
| 549 | if (copy_from_user(&bi, arg, sizeof(comedi_bufinfo))) |
| 550 | return -EFAULT; |
| 551 | |
| 552 | if (bi.subdevice >= dev->n_subdevices || bi.subdevice < 0) |
| 553 | return -EINVAL; |
| 554 | |
| 555 | s = dev->subdevices + bi.subdevice; |
| 556 | async = s->async; |
| 557 | |
| 558 | if (!async) { |
| 559 | DPRINTK("subdevice does not have async capability\n"); |
| 560 | bi.buf_write_ptr = 0; |
| 561 | bi.buf_read_ptr = 0; |
| 562 | bi.buf_write_count = 0; |
| 563 | bi.buf_read_count = 0; |
| 564 | goto copyback; |
| 565 | } |
| 566 | |
| 567 | if (bi.bytes_read && (s->subdev_flags & SDF_CMD_READ)) { |
| 568 | bi.bytes_read = comedi_buf_read_alloc(async, bi.bytes_read); |
| 569 | comedi_buf_read_free(async, bi.bytes_read); |
| 570 | |
| 571 | if (!(comedi_get_subdevice_runflags(s) & (SRF_ERROR | |
| 572 | SRF_RUNNING)) |
| 573 | && async->buf_write_count == async->buf_read_count) { |
| 574 | do_become_nonbusy(dev, s); |
| 575 | } |
| 576 | } |
| 577 | |
| 578 | if (bi.bytes_written && (s->subdev_flags & SDF_CMD_WRITE)) { |
| 579 | bi.bytes_written = |
| 580 | comedi_buf_write_alloc(async, bi.bytes_written); |
| 581 | comedi_buf_write_free(async, bi.bytes_written); |
| 582 | } |
| 583 | |
| 584 | bi.buf_write_count = async->buf_write_count; |
| 585 | bi.buf_write_ptr = async->buf_write_ptr; |
| 586 | bi.buf_read_count = async->buf_read_count; |
| 587 | bi.buf_read_ptr = async->buf_read_ptr; |
| 588 | |
| 589 | copyback: |
| 590 | if (copy_to_user(arg, &bi, sizeof(comedi_bufinfo))) |
| 591 | return -EFAULT; |
| 592 | |
| 593 | return 0; |
| 594 | } |
| 595 | |
| 596 | static int parse_insn(comedi_device * dev, comedi_insn * insn, lsampl_t * data, |
| 597 | void *file); |
| 598 | /* |
| 599 | * COMEDI_INSNLIST |
| 600 | * synchronous instructions |
| 601 | * |
| 602 | * arg: |
| 603 | * pointer to sync cmd structure |
| 604 | * |
| 605 | * reads: |
| 606 | * sync cmd struct at arg |
| 607 | * instruction list |
| 608 | * data (for writes) |
| 609 | * |
| 610 | * writes: |
| 611 | * data (for reads) |
| 612 | */ |
| 613 | /* arbitrary limits */ |
| 614 | #define MAX_SAMPLES 256 |
| 615 | static int do_insnlist_ioctl(comedi_device * dev, void *arg, void *file) |
| 616 | { |
| 617 | comedi_insnlist insnlist; |
| 618 | comedi_insn *insns = NULL; |
| 619 | lsampl_t *data = NULL; |
| 620 | int i = 0; |
| 621 | int ret = 0; |
| 622 | |
| 623 | if (copy_from_user(&insnlist, arg, sizeof(comedi_insnlist))) |
| 624 | return -EFAULT; |
| 625 | |
| 626 | data = kmalloc(sizeof(lsampl_t) * MAX_SAMPLES, GFP_KERNEL); |
| 627 | if (!data) { |
| 628 | DPRINTK("kmalloc failed\n"); |
| 629 | ret = -ENOMEM; |
| 630 | goto error; |
| 631 | } |
| 632 | |
| 633 | insns = kmalloc(sizeof(comedi_insn) * insnlist.n_insns, GFP_KERNEL); |
| 634 | if (!insns) { |
| 635 | DPRINTK("kmalloc failed\n"); |
| 636 | ret = -ENOMEM; |
| 637 | goto error; |
| 638 | } |
| 639 | |
| 640 | if (copy_from_user(insns, insnlist.insns, |
| 641 | sizeof(comedi_insn) * insnlist.n_insns)) { |
| 642 | DPRINTK("copy_from_user failed\n"); |
| 643 | ret = -EFAULT; |
| 644 | goto error; |
| 645 | } |
| 646 | |
| 647 | for (i = 0; i < insnlist.n_insns; i++) { |
| 648 | if (insns[i].n > MAX_SAMPLES) { |
| 649 | DPRINTK("number of samples too large\n"); |
| 650 | ret = -EINVAL; |
| 651 | goto error; |
| 652 | } |
| 653 | if (insns[i].insn & INSN_MASK_WRITE) { |
| 654 | if (copy_from_user(data, insns[i].data, |
| 655 | insns[i].n * sizeof(lsampl_t))) { |
| 656 | DPRINTK("copy_from_user failed\n"); |
| 657 | ret = -EFAULT; |
| 658 | goto error; |
| 659 | } |
| 660 | } |
| 661 | ret = parse_insn(dev, insns + i, data, file); |
| 662 | if (ret < 0) |
| 663 | goto error; |
| 664 | if (insns[i].insn & INSN_MASK_READ) { |
| 665 | if (copy_to_user(insns[i].data, data, |
| 666 | insns[i].n * sizeof(lsampl_t))) { |
| 667 | DPRINTK("copy_to_user failed\n"); |
| 668 | ret = -EFAULT; |
| 669 | goto error; |
| 670 | } |
| 671 | } |
| 672 | if (need_resched()) |
| 673 | schedule(); |
| 674 | } |
| 675 | |
| 676 | error: |
| 677 | if (insns) |
| 678 | kfree(insns); |
| 679 | if (data) |
| 680 | kfree(data); |
| 681 | |
| 682 | if (ret < 0) |
| 683 | return ret; |
| 684 | return i; |
| 685 | } |
| 686 | |
| 687 | static int check_insn_config_length(comedi_insn * insn, lsampl_t * data) |
| 688 | { |
| 689 | if(insn->n < 1) return -EINVAL; |
| 690 | |
| 691 | switch (data[0]) { |
| 692 | case INSN_CONFIG_DIO_OUTPUT: |
| 693 | case INSN_CONFIG_DIO_INPUT: |
| 694 | case INSN_CONFIG_DISARM: |
| 695 | case INSN_CONFIG_RESET: |
| 696 | if (insn->n == 1) |
| 697 | return 0; |
| 698 | break; |
| 699 | case INSN_CONFIG_ARM: |
| 700 | case INSN_CONFIG_DIO_QUERY: |
| 701 | case INSN_CONFIG_BLOCK_SIZE: |
| 702 | case INSN_CONFIG_FILTER: |
| 703 | case INSN_CONFIG_SERIAL_CLOCK: |
| 704 | case INSN_CONFIG_BIDIRECTIONAL_DATA: |
| 705 | case INSN_CONFIG_ALT_SOURCE: |
| 706 | case INSN_CONFIG_SET_COUNTER_MODE: |
| 707 | case INSN_CONFIG_8254_READ_STATUS: |
| 708 | case INSN_CONFIG_SET_ROUTING: |
| 709 | case INSN_CONFIG_GET_ROUTING: |
| 710 | case INSN_CONFIG_GET_PWM_STATUS: |
| 711 | case INSN_CONFIG_PWM_SET_PERIOD: |
| 712 | case INSN_CONFIG_PWM_GET_PERIOD: |
| 713 | if (insn->n == 2) |
| 714 | return 0; |
| 715 | break; |
| 716 | case INSN_CONFIG_SET_GATE_SRC: |
| 717 | case INSN_CONFIG_GET_GATE_SRC: |
| 718 | case INSN_CONFIG_SET_CLOCK_SRC: |
| 719 | case INSN_CONFIG_GET_CLOCK_SRC: |
| 720 | case INSN_CONFIG_SET_OTHER_SRC: |
| 721 | case INSN_CONFIG_GET_COUNTER_STATUS: |
| 722 | case INSN_CONFIG_PWM_SET_H_BRIDGE: |
| 723 | case INSN_CONFIG_PWM_GET_H_BRIDGE: |
| 724 | case INSN_CONFIG_GET_HARDWARE_BUFFER_SIZE: |
| 725 | if (insn->n == 3) |
| 726 | return 0; |
| 727 | break; |
| 728 | case INSN_CONFIG_PWM_OUTPUT: |
| 729 | case INSN_CONFIG_ANALOG_TRIG: |
| 730 | if (insn->n == 5) |
| 731 | return 0; |
| 732 | break; |
| 733 | //by default we allow the insn since we don't have checks for all possible cases yet |
| 734 | default: |
| 735 | rt_printk |
| 736 | ("comedi: no check for data length of config insn id %i is implemented.\n" |
| 737 | " Add a check to %s in %s.\n" |
| 738 | " Assuming n=%i is correct.\n", data[0], __FUNCTION__, |
| 739 | __FILE__, insn->n); |
| 740 | return 0; |
| 741 | break; |
| 742 | } |
| 743 | return -EINVAL; |
| 744 | } |
| 745 | |
| 746 | static int parse_insn(comedi_device * dev, comedi_insn * insn, lsampl_t * data, |
| 747 | void *file) |
| 748 | { |
| 749 | comedi_subdevice *s; |
| 750 | int ret = 0; |
| 751 | int i; |
| 752 | |
| 753 | if (insn->insn & INSN_MASK_SPECIAL) { |
| 754 | /* a non-subdevice instruction */ |
| 755 | |
| 756 | switch (insn->insn) { |
| 757 | case INSN_GTOD: |
| 758 | { |
| 759 | struct timeval tv; |
| 760 | |
| 761 | if (insn->n != 2) { |
| 762 | ret = -EINVAL; |
| 763 | break; |
| 764 | } |
| 765 | |
| 766 | do_gettimeofday(&tv); |
| 767 | data[0] = tv.tv_sec; |
| 768 | data[1] = tv.tv_usec; |
| 769 | ret = 2; |
| 770 | |
| 771 | break; |
| 772 | } |
| 773 | case INSN_WAIT: |
| 774 | if (insn->n != 1 || data[0] >= 100000) { |
| 775 | ret = -EINVAL; |
| 776 | break; |
| 777 | } |
| 778 | udelay(data[0] / 1000); |
| 779 | ret = 1; |
| 780 | break; |
| 781 | case INSN_INTTRIG: |
| 782 | if (insn->n != 1) { |
| 783 | ret = -EINVAL; |
| 784 | break; |
| 785 | } |
| 786 | if (insn->subdev >= dev->n_subdevices) { |
| 787 | DPRINTK("%d not usable subdevice\n", |
| 788 | insn->subdev); |
| 789 | ret = -EINVAL; |
| 790 | break; |
| 791 | } |
| 792 | s = dev->subdevices + insn->subdev; |
| 793 | if (!s->async) { |
| 794 | DPRINTK("no async\n"); |
| 795 | ret = -EINVAL; |
| 796 | break; |
| 797 | } |
| 798 | if (!s->async->inttrig) { |
| 799 | DPRINTK("no inttrig\n"); |
| 800 | ret = -EAGAIN; |
| 801 | break; |
| 802 | } |
| 803 | ret = s->async->inttrig(dev, s, insn->data[0]); |
| 804 | if (ret >= 0) |
| 805 | ret = 1; |
| 806 | break; |
| 807 | default: |
| 808 | DPRINTK("invalid insn\n"); |
| 809 | ret = -EINVAL; |
| 810 | break; |
| 811 | } |
| 812 | } else { |
| 813 | /* a subdevice instruction */ |
| 814 | lsampl_t maxdata; |
| 815 | |
| 816 | if (insn->subdev >= dev->n_subdevices) { |
| 817 | DPRINTK("subdevice %d out of range\n", insn->subdev); |
| 818 | ret = -EINVAL; |
| 819 | goto out; |
| 820 | } |
| 821 | s = dev->subdevices + insn->subdev; |
| 822 | |
| 823 | if (s->type == COMEDI_SUBD_UNUSED) { |
| 824 | DPRINTK("%d not usable subdevice\n", insn->subdev); |
| 825 | ret = -EIO; |
| 826 | goto out; |
| 827 | } |
| 828 | |
| 829 | /* are we locked? (ioctl lock) */ |
| 830 | if (s->lock && s->lock != file) { |
| 831 | DPRINTK("device locked\n"); |
| 832 | ret = -EACCES; |
| 833 | goto out; |
| 834 | } |
| 835 | |
| 836 | if ((ret = check_chanlist(s, 1, &insn->chanspec)) < 0) { |
| 837 | ret = -EINVAL; |
| 838 | DPRINTK("bad chanspec\n"); |
| 839 | goto out; |
| 840 | } |
| 841 | |
| 842 | if (s->busy) { |
| 843 | ret = -EBUSY; |
| 844 | goto out; |
| 845 | } |
| 846 | /* This looks arbitrary. It is. */ |
| 847 | s->busy = &parse_insn; |
| 848 | switch (insn->insn) { |
| 849 | case INSN_READ: |
| 850 | ret = s->insn_read(dev, s, insn, data); |
| 851 | break; |
| 852 | case INSN_WRITE: |
| 853 | maxdata = s->maxdata_list |
| 854 | ? s->maxdata_list[CR_CHAN(insn->chanspec)] |
| 855 | : s->maxdata; |
| 856 | for (i = 0; i < insn->n; ++i) { |
| 857 | if (data[i] > maxdata) { |
| 858 | ret = -EINVAL; |
| 859 | DPRINTK("bad data value(s)\n"); |
| 860 | break; |
| 861 | } |
| 862 | } |
| 863 | if (ret == 0) |
| 864 | ret = s->insn_write(dev, s, insn, data); |
| 865 | break; |
| 866 | case INSN_BITS: |
| 867 | if (insn->n != 2) { |
| 868 | ret = -EINVAL; |
| 869 | break; |
| 870 | } |
| 871 | ret = s->insn_bits(dev, s, insn, data); |
| 872 | break; |
| 873 | case INSN_CONFIG: |
| 874 | ret = check_insn_config_length(insn, data); |
| 875 | if (ret) |
| 876 | break; |
| 877 | ret = s->insn_config(dev, s, insn, data); |
| 878 | break; |
| 879 | default: |
| 880 | ret = -EINVAL; |
| 881 | break; |
| 882 | } |
| 883 | |
| 884 | s->busy = NULL; |
| 885 | } |
| 886 | |
| 887 | out: |
| 888 | return ret; |
| 889 | } |
| 890 | |
| 891 | /* |
| 892 | * COMEDI_INSN |
| 893 | * synchronous instructions |
| 894 | * |
| 895 | * arg: |
| 896 | * pointer to insn |
| 897 | * |
| 898 | * reads: |
| 899 | * comedi_insn struct at arg |
| 900 | * data (for writes) |
| 901 | * |
| 902 | * writes: |
| 903 | * data (for reads) |
| 904 | */ |
| 905 | static int do_insn_ioctl(comedi_device * dev, void *arg, void *file) |
| 906 | { |
| 907 | comedi_insn insn; |
| 908 | lsampl_t *data = NULL; |
| 909 | int ret = 0; |
| 910 | |
| 911 | data = kmalloc(sizeof(lsampl_t) * MAX_SAMPLES, GFP_KERNEL); |
| 912 | if (!data) { |
| 913 | ret = -ENOMEM; |
| 914 | goto error; |
| 915 | } |
| 916 | |
| 917 | if (copy_from_user(&insn, arg, sizeof(comedi_insn))) { |
| 918 | ret = -EFAULT; |
| 919 | goto error; |
| 920 | } |
| 921 | |
| 922 | /* This is where the behavior of insn and insnlist deviate. */ |
| 923 | if (insn.n > MAX_SAMPLES) |
| 924 | insn.n = MAX_SAMPLES; |
| 925 | if (insn.insn & INSN_MASK_WRITE) { |
| 926 | if (copy_from_user(data, insn.data, insn.n * sizeof(lsampl_t))) { |
| 927 | ret = -EFAULT; |
| 928 | goto error; |
| 929 | } |
| 930 | } |
| 931 | ret = parse_insn(dev, &insn, data, file); |
| 932 | if (ret < 0) |
| 933 | goto error; |
| 934 | if (insn.insn & INSN_MASK_READ) { |
| 935 | if (copy_to_user(insn.data, data, insn.n * sizeof(lsampl_t))) { |
| 936 | ret = -EFAULT; |
| 937 | goto error; |
| 938 | } |
| 939 | } |
| 940 | ret = insn.n; |
| 941 | |
| 942 | error: |
| 943 | if (data) |
| 944 | kfree(data); |
| 945 | |
| 946 | return ret; |
| 947 | } |
| 948 | |
| 949 | /* |
| 950 | COMEDI_CMD |
| 951 | command ioctl |
| 952 | |
| 953 | arg: |
| 954 | pointer to cmd structure |
| 955 | |
| 956 | reads: |
| 957 | cmd structure at arg |
| 958 | channel/range list |
| 959 | |
| 960 | writes: |
| 961 | modified cmd structure at arg |
| 962 | |
| 963 | */ |
| 964 | static int do_cmd_ioctl(comedi_device * dev, void *arg, void *file) |
| 965 | { |
| 966 | comedi_cmd user_cmd; |
| 967 | comedi_subdevice *s; |
| 968 | comedi_async *async; |
| 969 | int ret = 0; |
| 970 | unsigned int *chanlist_saver = NULL; |
| 971 | |
| 972 | if (copy_from_user(&user_cmd, arg, sizeof(comedi_cmd))) { |
| 973 | DPRINTK("bad cmd address\n"); |
| 974 | return -EFAULT; |
| 975 | } |
| 976 | // save user's chanlist pointer so it can be restored later |
| 977 | chanlist_saver = user_cmd.chanlist; |
| 978 | |
| 979 | if (user_cmd.subdev >= dev->n_subdevices) { |
| 980 | DPRINTK("%d no such subdevice\n", user_cmd.subdev); |
| 981 | return -ENODEV; |
| 982 | } |
| 983 | |
| 984 | s = dev->subdevices + user_cmd.subdev; |
| 985 | async = s->async; |
| 986 | |
| 987 | if (s->type == COMEDI_SUBD_UNUSED) { |
| 988 | DPRINTK("%d not valid subdevice\n", user_cmd.subdev); |
| 989 | return -EIO; |
| 990 | } |
| 991 | |
| 992 | if (!s->do_cmd || !s->do_cmdtest || !s->async) { |
| 993 | DPRINTK("subdevice %i does not support commands\n", |
| 994 | user_cmd.subdev); |
| 995 | return -EIO; |
| 996 | } |
| 997 | |
| 998 | /* are we locked? (ioctl lock) */ |
| 999 | if (s->lock && s->lock != file) { |
| 1000 | DPRINTK("subdevice locked\n"); |
| 1001 | return -EACCES; |
| 1002 | } |
| 1003 | |
| 1004 | /* are we busy? */ |
| 1005 | if (s->busy) { |
| 1006 | DPRINTK("subdevice busy\n"); |
| 1007 | return -EBUSY; |
| 1008 | } |
| 1009 | s->busy = file; |
| 1010 | |
| 1011 | /* make sure channel/gain list isn't too long */ |
| 1012 | if (user_cmd.chanlist_len > s->len_chanlist) { |
| 1013 | DPRINTK("channel/gain list too long %u > %d\n", |
| 1014 | user_cmd.chanlist_len, s->len_chanlist); |
| 1015 | ret = -EINVAL; |
| 1016 | goto cleanup; |
| 1017 | } |
| 1018 | |
| 1019 | /* make sure channel/gain list isn't too short */ |
| 1020 | if (user_cmd.chanlist_len < 1) { |
| 1021 | DPRINTK("channel/gain list too short %u < 1\n", |
| 1022 | user_cmd.chanlist_len); |
| 1023 | ret = -EINVAL; |
| 1024 | goto cleanup; |
| 1025 | } |
| 1026 | |
| 1027 | if (async->cmd.chanlist) |
| 1028 | kfree(async->cmd.chanlist); |
| 1029 | async->cmd = user_cmd; |
| 1030 | async->cmd.data = NULL; |
| 1031 | /* load channel/gain list */ |
| 1032 | async->cmd.chanlist = |
| 1033 | kmalloc(async->cmd.chanlist_len * sizeof(int), GFP_KERNEL); |
| 1034 | if (!async->cmd.chanlist) { |
| 1035 | DPRINTK("allocation failed\n"); |
| 1036 | ret = -ENOMEM; |
| 1037 | goto cleanup; |
| 1038 | } |
| 1039 | |
| 1040 | if (copy_from_user(async->cmd.chanlist, user_cmd.chanlist, |
| 1041 | async->cmd.chanlist_len * sizeof(int))) { |
| 1042 | DPRINTK("fault reading chanlist\n"); |
| 1043 | ret = -EFAULT; |
| 1044 | goto cleanup; |
| 1045 | } |
| 1046 | |
| 1047 | /* make sure each element in channel/gain list is valid */ |
| 1048 | if ((ret = check_chanlist(s, async->cmd.chanlist_len, |
| 1049 | async->cmd.chanlist)) < 0) { |
| 1050 | DPRINTK("bad chanlist\n"); |
| 1051 | goto cleanup; |
| 1052 | } |
| 1053 | |
| 1054 | ret = s->do_cmdtest(dev, s, &async->cmd); |
| 1055 | |
| 1056 | if (async->cmd.flags & TRIG_BOGUS || ret) { |
| 1057 | DPRINTK("test returned %d\n", ret); |
| 1058 | user_cmd = async->cmd; |
| 1059 | // restore chanlist pointer before copying back |
| 1060 | user_cmd.chanlist = chanlist_saver; |
| 1061 | user_cmd.data = NULL; |
| 1062 | if (copy_to_user(arg, &user_cmd, sizeof(comedi_cmd))) { |
| 1063 | DPRINTK("fault writing cmd\n"); |
| 1064 | ret = -EFAULT; |
| 1065 | goto cleanup; |
| 1066 | } |
| 1067 | ret = -EAGAIN; |
| 1068 | goto cleanup; |
| 1069 | } |
| 1070 | |
| 1071 | if (!async->prealloc_bufsz) { |
| 1072 | ret = -ENOMEM; |
| 1073 | DPRINTK("no buffer (?)\n"); |
| 1074 | goto cleanup; |
| 1075 | } |
| 1076 | |
| 1077 | comedi_reset_async_buf(async); |
| 1078 | |
| 1079 | async->cb_mask = |
| 1080 | COMEDI_CB_EOA | COMEDI_CB_BLOCK | COMEDI_CB_ERROR | |
| 1081 | COMEDI_CB_OVERFLOW; |
| 1082 | if (async->cmd.flags & TRIG_WAKE_EOS) { |
| 1083 | async->cb_mask |= COMEDI_CB_EOS; |
| 1084 | } |
| 1085 | |
| 1086 | comedi_set_subdevice_runflags(s, ~0, SRF_USER | SRF_RUNNING); |
| 1087 | |
| 1088 | #ifdef CONFIG_COMEDI_RT |
| 1089 | if (async->cmd.flags & TRIG_RT) { |
| 1090 | if (comedi_switch_to_rt(dev) == 0) |
| 1091 | comedi_set_subdevice_runflags(s, SRF_RT, SRF_RT); |
| 1092 | } |
| 1093 | #endif |
| 1094 | |
| 1095 | ret = s->do_cmd(dev, s); |
| 1096 | if (ret == 0) |
| 1097 | return 0; |
| 1098 | |
| 1099 | cleanup: |
| 1100 | do_become_nonbusy(dev, s); |
| 1101 | |
| 1102 | return ret; |
| 1103 | } |
| 1104 | |
| 1105 | /* |
| 1106 | COMEDI_CMDTEST |
| 1107 | command testing ioctl |
| 1108 | |
| 1109 | arg: |
| 1110 | pointer to cmd structure |
| 1111 | |
| 1112 | reads: |
| 1113 | cmd structure at arg |
| 1114 | channel/range list |
| 1115 | |
| 1116 | writes: |
| 1117 | modified cmd structure at arg |
| 1118 | |
| 1119 | */ |
| 1120 | static int do_cmdtest_ioctl(comedi_device * dev, void *arg, void *file) |
| 1121 | { |
| 1122 | comedi_cmd user_cmd; |
| 1123 | comedi_subdevice *s; |
| 1124 | int ret = 0; |
| 1125 | unsigned int *chanlist = NULL; |
| 1126 | unsigned int *chanlist_saver = NULL; |
| 1127 | |
| 1128 | if (copy_from_user(&user_cmd, arg, sizeof(comedi_cmd))) { |
| 1129 | DPRINTK("bad cmd address\n"); |
| 1130 | return -EFAULT; |
| 1131 | } |
| 1132 | // save user's chanlist pointer so it can be restored later |
| 1133 | chanlist_saver = user_cmd.chanlist; |
| 1134 | |
| 1135 | if (user_cmd.subdev >= dev->n_subdevices) { |
| 1136 | DPRINTK("%d no such subdevice\n", user_cmd.subdev); |
| 1137 | return -ENODEV; |
| 1138 | } |
| 1139 | |
| 1140 | s = dev->subdevices + user_cmd.subdev; |
| 1141 | if (s->type == COMEDI_SUBD_UNUSED) { |
| 1142 | DPRINTK("%d not valid subdevice\n", user_cmd.subdev); |
| 1143 | return -EIO; |
| 1144 | } |
| 1145 | |
| 1146 | if (!s->do_cmd || !s->do_cmdtest) { |
| 1147 | DPRINTK("subdevice %i does not support commands\n", |
| 1148 | user_cmd.subdev); |
| 1149 | return -EIO; |
| 1150 | } |
| 1151 | |
| 1152 | /* make sure channel/gain list isn't too long */ |
| 1153 | if (user_cmd.chanlist_len > s->len_chanlist) { |
| 1154 | DPRINTK("channel/gain list too long %d > %d\n", |
| 1155 | user_cmd.chanlist_len, s->len_chanlist); |
| 1156 | ret = -EINVAL; |
| 1157 | goto cleanup; |
| 1158 | } |
| 1159 | |
| 1160 | /* load channel/gain list */ |
| 1161 | if (user_cmd.chanlist) { |
| 1162 | chanlist = |
| 1163 | kmalloc(user_cmd.chanlist_len * sizeof(int), |
| 1164 | GFP_KERNEL); |
| 1165 | if (!chanlist) { |
| 1166 | DPRINTK("allocation failed\n"); |
| 1167 | ret = -ENOMEM; |
| 1168 | goto cleanup; |
| 1169 | } |
| 1170 | |
| 1171 | if (copy_from_user(chanlist, user_cmd.chanlist, |
| 1172 | user_cmd.chanlist_len * sizeof(int))) { |
| 1173 | DPRINTK("fault reading chanlist\n"); |
| 1174 | ret = -EFAULT; |
| 1175 | goto cleanup; |
| 1176 | } |
| 1177 | |
| 1178 | /* make sure each element in channel/gain list is valid */ |
| 1179 | if ((ret = check_chanlist(s, user_cmd.chanlist_len, |
| 1180 | chanlist)) < 0) { |
| 1181 | DPRINTK("bad chanlist\n"); |
| 1182 | goto cleanup; |
| 1183 | } |
| 1184 | |
| 1185 | user_cmd.chanlist = chanlist; |
| 1186 | } |
| 1187 | |
| 1188 | ret = s->do_cmdtest(dev, s, &user_cmd); |
| 1189 | |
| 1190 | // restore chanlist pointer before copying back |
| 1191 | user_cmd.chanlist = chanlist_saver; |
| 1192 | |
| 1193 | if (copy_to_user(arg, &user_cmd, sizeof(comedi_cmd))) { |
| 1194 | DPRINTK("bad cmd address\n"); |
| 1195 | ret = -EFAULT; |
| 1196 | goto cleanup; |
| 1197 | } |
| 1198 | cleanup: |
| 1199 | if (chanlist) |
| 1200 | kfree(chanlist); |
| 1201 | |
| 1202 | return ret; |
| 1203 | } |
| 1204 | |
| 1205 | /* |
| 1206 | COMEDI_LOCK |
| 1207 | lock subdevice |
| 1208 | |
| 1209 | arg: |
| 1210 | subdevice number |
| 1211 | |
| 1212 | reads: |
| 1213 | none |
| 1214 | |
| 1215 | writes: |
| 1216 | none |
| 1217 | |
| 1218 | */ |
| 1219 | |
| 1220 | static int do_lock_ioctl(comedi_device * dev, unsigned int arg, void *file) |
| 1221 | { |
| 1222 | int ret = 0; |
| 1223 | unsigned long flags; |
| 1224 | comedi_subdevice *s; |
| 1225 | |
| 1226 | if (arg >= dev->n_subdevices) |
| 1227 | return -EINVAL; |
| 1228 | s = dev->subdevices + arg; |
| 1229 | |
| 1230 | comedi_spin_lock_irqsave(&s->spin_lock, flags); |
| 1231 | if (s->busy || s->lock) { |
| 1232 | ret = -EBUSY; |
| 1233 | } else { |
| 1234 | s->lock = file; |
| 1235 | } |
| 1236 | comedi_spin_unlock_irqrestore(&s->spin_lock, flags); |
| 1237 | |
| 1238 | if (ret < 0) |
| 1239 | return ret; |
| 1240 | |
| 1241 | #if 0 |
| 1242 | if (s->lock_f) |
| 1243 | ret = s->lock_f(dev, s); |
| 1244 | #endif |
| 1245 | |
| 1246 | return ret; |
| 1247 | } |
| 1248 | |
| 1249 | /* |
| 1250 | COMEDI_UNLOCK |
| 1251 | unlock subdevice |
| 1252 | |
| 1253 | arg: |
| 1254 | subdevice number |
| 1255 | |
| 1256 | reads: |
| 1257 | none |
| 1258 | |
| 1259 | writes: |
| 1260 | none |
| 1261 | |
| 1262 | This function isn't protected by the semaphore, since |
| 1263 | we already own the lock. |
| 1264 | */ |
| 1265 | static int do_unlock_ioctl(comedi_device * dev, unsigned int arg, void *file) |
| 1266 | { |
| 1267 | comedi_subdevice *s; |
| 1268 | |
| 1269 | if (arg >= dev->n_subdevices) |
| 1270 | return -EINVAL; |
| 1271 | s = dev->subdevices + arg; |
| 1272 | |
| 1273 | if (s->busy) |
| 1274 | return -EBUSY; |
| 1275 | |
| 1276 | if (s->lock && s->lock != file) |
| 1277 | return -EACCES; |
| 1278 | |
| 1279 | if (s->lock == file) { |
| 1280 | #if 0 |
| 1281 | if (s->unlock) |
| 1282 | s->unlock(dev, s); |
| 1283 | #endif |
| 1284 | |
| 1285 | s->lock = NULL; |
| 1286 | } |
| 1287 | |
| 1288 | return 0; |
| 1289 | } |
| 1290 | |
| 1291 | /* |
| 1292 | COMEDI_CANCEL |
| 1293 | cancel acquisition ioctl |
| 1294 | |
| 1295 | arg: |
| 1296 | subdevice number |
| 1297 | |
| 1298 | reads: |
| 1299 | nothing |
| 1300 | |
| 1301 | writes: |
| 1302 | nothing |
| 1303 | |
| 1304 | */ |
| 1305 | static int do_cancel_ioctl(comedi_device * dev, unsigned int arg, void *file) |
| 1306 | { |
| 1307 | comedi_subdevice *s; |
| 1308 | |
| 1309 | if (arg >= dev->n_subdevices) |
| 1310 | return -EINVAL; |
| 1311 | s = dev->subdevices + arg; |
| 1312 | if (s->async == NULL) |
| 1313 | return -EINVAL; |
| 1314 | |
| 1315 | if (s->lock && s->lock != file) |
| 1316 | return -EACCES; |
| 1317 | |
| 1318 | if (!s->busy) |
| 1319 | return 0; |
| 1320 | |
| 1321 | if (s->busy != file) |
| 1322 | return -EBUSY; |
| 1323 | |
| 1324 | return do_cancel(dev, s); |
| 1325 | } |
| 1326 | |
| 1327 | /* |
| 1328 | COMEDI_POLL ioctl |
| 1329 | instructs driver to synchronize buffers |
| 1330 | |
| 1331 | arg: |
| 1332 | subdevice number |
| 1333 | |
| 1334 | reads: |
| 1335 | nothing |
| 1336 | |
| 1337 | writes: |
| 1338 | nothing |
| 1339 | |
| 1340 | */ |
| 1341 | static int do_poll_ioctl(comedi_device * dev, unsigned int arg, void *file) |
| 1342 | { |
| 1343 | comedi_subdevice *s; |
| 1344 | |
| 1345 | if (arg >= dev->n_subdevices) |
| 1346 | return -EINVAL; |
| 1347 | s = dev->subdevices + arg; |
| 1348 | |
| 1349 | if (s->lock && s->lock != file) |
| 1350 | return -EACCES; |
| 1351 | |
| 1352 | if (!s->busy) |
| 1353 | return 0; |
| 1354 | |
| 1355 | if (s->busy != file) |
| 1356 | return -EBUSY; |
| 1357 | |
| 1358 | if (s->poll) |
| 1359 | return s->poll(dev, s); |
| 1360 | |
| 1361 | return -EINVAL; |
| 1362 | } |
| 1363 | |
| 1364 | static int do_cancel(comedi_device * dev, comedi_subdevice * s) |
| 1365 | { |
| 1366 | int ret = 0; |
| 1367 | |
| 1368 | if ((comedi_get_subdevice_runflags(s) & SRF_RUNNING) && s->cancel) |
| 1369 | ret = s->cancel(dev, s); |
| 1370 | |
| 1371 | do_become_nonbusy(dev, s); |
| 1372 | |
| 1373 | return ret; |
| 1374 | } |
| 1375 | |
| 1376 | void comedi_unmap(struct vm_area_struct *area) |
| 1377 | { |
| 1378 | comedi_async *async; |
| 1379 | comedi_device *dev; |
| 1380 | |
| 1381 | async = area->vm_private_data; |
| 1382 | dev = async->subdevice->device; |
| 1383 | |
| 1384 | mutex_lock(&dev->mutex); |
| 1385 | async->mmap_count--; |
| 1386 | mutex_unlock(&dev->mutex); |
| 1387 | } |
| 1388 | |
| 1389 | static struct vm_operations_struct comedi_vm_ops = { |
| 1390 | close:comedi_unmap, |
| 1391 | }; |
| 1392 | |
| 1393 | static int comedi_mmap(struct file *file, struct vm_area_struct *vma) |
| 1394 | { |
| 1395 | const unsigned minor = iminor(file->f_dentry->d_inode); |
| 1396 | struct comedi_device_file_info *dev_file_info = comedi_get_device_file_info(minor); |
| 1397 | comedi_device *dev = dev_file_info->device; |
| 1398 | comedi_async *async = NULL; |
| 1399 | unsigned long start = vma->vm_start; |
| 1400 | unsigned long size; |
| 1401 | int n_pages; |
| 1402 | int i; |
| 1403 | int retval; |
| 1404 | comedi_subdevice *s; |
| 1405 | |
| 1406 | mutex_lock(&dev->mutex); |
| 1407 | if (!dev->attached) { |
| 1408 | DPRINTK("no driver configured on comedi%i\n", dev->minor); |
| 1409 | retval = -ENODEV; |
| 1410 | goto done; |
| 1411 | } |
| 1412 | if (vma->vm_flags & VM_WRITE) { |
| 1413 | s = comedi_get_write_subdevice(dev_file_info); |
| 1414 | } else { |
| 1415 | s = comedi_get_read_subdevice(dev_file_info); |
| 1416 | } |
| 1417 | if (s == NULL) { |
| 1418 | retval = -EINVAL; |
| 1419 | goto done; |
| 1420 | } |
| 1421 | async = s->async; |
| 1422 | if (async == NULL) { |
| 1423 | retval = -EINVAL; |
| 1424 | goto done; |
| 1425 | } |
| 1426 | |
| 1427 | if (vma->vm_pgoff != 0) { |
| 1428 | DPRINTK("comedi: mmap() offset must be 0.\n"); |
| 1429 | retval = -EINVAL; |
| 1430 | goto done; |
| 1431 | } |
| 1432 | |
| 1433 | size = vma->vm_end - vma->vm_start; |
| 1434 | if (size > async->prealloc_bufsz) { |
| 1435 | retval = -EFAULT; |
| 1436 | goto done; |
| 1437 | } |
| 1438 | if (size & (~PAGE_MASK)) { |
| 1439 | retval = -EFAULT; |
| 1440 | goto done; |
| 1441 | } |
| 1442 | |
| 1443 | n_pages = size >> PAGE_SHIFT; |
| 1444 | for (i = 0; i < n_pages; ++i) { |
| 1445 | if (remap_pfn_range(vma, start, |
| 1446 | page_to_pfn(virt_to_page(async-> |
| 1447 | buf_page_list[i].virt_addr)), |
| 1448 | PAGE_SIZE, PAGE_SHARED)) { |
| 1449 | retval = -EAGAIN; |
| 1450 | goto done; |
| 1451 | } |
| 1452 | start += PAGE_SIZE; |
| 1453 | } |
| 1454 | |
| 1455 | vma->vm_ops = &comedi_vm_ops; |
| 1456 | vma->vm_private_data = async; |
| 1457 | |
| 1458 | async->mmap_count++; |
| 1459 | |
| 1460 | retval = 0; |
| 1461 | done: |
| 1462 | mutex_unlock(&dev->mutex); |
| 1463 | return retval; |
| 1464 | } |
| 1465 | |
| 1466 | static unsigned int comedi_poll(struct file *file, poll_table * wait) |
| 1467 | { |
| 1468 | unsigned int mask = 0; |
| 1469 | const unsigned minor = iminor(file->f_dentry->d_inode); |
| 1470 | struct comedi_device_file_info *dev_file_info = comedi_get_device_file_info(minor); |
| 1471 | comedi_device *dev = dev_file_info->device; |
| 1472 | comedi_subdevice *read_subdev; |
| 1473 | comedi_subdevice *write_subdev; |
| 1474 | |
| 1475 | mutex_lock(&dev->mutex); |
| 1476 | if (!dev->attached) { |
| 1477 | DPRINTK("no driver configured on comedi%i\n", dev->minor); |
| 1478 | mutex_unlock(&dev->mutex); |
| 1479 | return 0; |
| 1480 | } |
| 1481 | |
| 1482 | mask = 0; |
| 1483 | read_subdev = comedi_get_read_subdevice(dev_file_info); |
| 1484 | if (read_subdev) { |
| 1485 | poll_wait(file, &read_subdev->async->wait_head, wait); |
| 1486 | if (!read_subdev->busy |
| 1487 | || comedi_buf_read_n_available(read_subdev->async) > 0 |
| 1488 | || !(comedi_get_subdevice_runflags(read_subdev) & |
| 1489 | SRF_RUNNING)) { |
| 1490 | mask |= POLLIN | POLLRDNORM; |
| 1491 | } |
| 1492 | } |
| 1493 | write_subdev = comedi_get_write_subdevice(dev_file_info); |
| 1494 | if (write_subdev) { |
| 1495 | poll_wait(file, &write_subdev->async->wait_head, wait); |
| 1496 | comedi_buf_write_alloc(write_subdev->async, write_subdev->async->prealloc_bufsz); |
| 1497 | if (!write_subdev->busy |
| 1498 | || !(comedi_get_subdevice_runflags(write_subdev) & |
| 1499 | SRF_RUNNING) |
| 1500 | || comedi_buf_write_n_allocated(write_subdev->async) >= |
| 1501 | bytes_per_sample(write_subdev->async->subdevice)) { |
| 1502 | mask |= POLLOUT | POLLWRNORM; |
| 1503 | } |
| 1504 | } |
| 1505 | |
| 1506 | mutex_unlock(&dev->mutex); |
| 1507 | return mask; |
| 1508 | } |
| 1509 | |
| 1510 | static ssize_t comedi_write(struct file *file, const char *buf, size_t nbytes, |
| 1511 | loff_t * offset) |
| 1512 | { |
| 1513 | comedi_subdevice *s; |
| 1514 | comedi_async *async; |
| 1515 | int n, m, count = 0, retval = 0; |
| 1516 | DECLARE_WAITQUEUE(wait, current); |
| 1517 | const unsigned minor = iminor(file->f_dentry->d_inode); |
| 1518 | struct comedi_device_file_info *dev_file_info = comedi_get_device_file_info(minor); |
| 1519 | comedi_device *dev = dev_file_info->device; |
| 1520 | |
| 1521 | if (!dev->attached) { |
| 1522 | DPRINTK("no driver configured on comedi%i\n", dev->minor); |
| 1523 | retval = -ENODEV; |
| 1524 | goto done; |
| 1525 | } |
| 1526 | |
| 1527 | s = comedi_get_write_subdevice(dev_file_info); |
| 1528 | if (s == NULL) { |
| 1529 | retval = -EIO; |
| 1530 | goto done; |
| 1531 | } |
| 1532 | async = s->async; |
| 1533 | |
| 1534 | if (!nbytes) { |
| 1535 | retval = 0; |
| 1536 | goto done; |
| 1537 | } |
| 1538 | if (!s->busy) { |
| 1539 | retval = 0; |
| 1540 | goto done; |
| 1541 | } |
| 1542 | if (s->busy != file) { |
| 1543 | retval = -EACCES; |
| 1544 | goto done; |
| 1545 | } |
| 1546 | add_wait_queue(&async->wait_head, &wait); |
| 1547 | while (nbytes > 0 && !retval) { |
| 1548 | set_current_state(TASK_INTERRUPTIBLE); |
| 1549 | |
| 1550 | n = nbytes; |
| 1551 | |
| 1552 | m = n; |
| 1553 | if (async->buf_write_ptr + m > async->prealloc_bufsz) { |
| 1554 | m = async->prealloc_bufsz - async->buf_write_ptr; |
| 1555 | } |
| 1556 | comedi_buf_write_alloc(async, async->prealloc_bufsz); |
| 1557 | if (m > comedi_buf_write_n_allocated(async)) { |
| 1558 | m = comedi_buf_write_n_allocated(async); |
| 1559 | } |
| 1560 | if (m < n) |
| 1561 | n = m; |
| 1562 | |
| 1563 | if (n == 0) { |
| 1564 | if (!(comedi_get_subdevice_runflags(s) & SRF_RUNNING)) { |
| 1565 | if (comedi_get_subdevice_runflags(s) & |
| 1566 | SRF_ERROR) { |
| 1567 | retval = -EPIPE; |
| 1568 | } else { |
| 1569 | retval = 0; |
| 1570 | } |
| 1571 | do_become_nonbusy(dev, s); |
| 1572 | break; |
| 1573 | } |
| 1574 | if (file->f_flags & O_NONBLOCK) { |
| 1575 | retval = -EAGAIN; |
| 1576 | break; |
| 1577 | } |
| 1578 | if (signal_pending(current)) { |
| 1579 | retval = -ERESTARTSYS; |
| 1580 | break; |
| 1581 | } |
| 1582 | schedule(); |
| 1583 | if (!s->busy) { |
| 1584 | break; |
| 1585 | } |
| 1586 | if (s->busy != file) { |
| 1587 | retval = -EACCES; |
| 1588 | break; |
| 1589 | } |
| 1590 | continue; |
| 1591 | } |
| 1592 | |
| 1593 | m = copy_from_user(async->prealloc_buf + async->buf_write_ptr, |
| 1594 | buf, n); |
| 1595 | if (m) { |
| 1596 | n -= m; |
| 1597 | retval = -EFAULT; |
| 1598 | } |
| 1599 | comedi_buf_write_free(async, n); |
| 1600 | |
| 1601 | count += n; |
| 1602 | nbytes -= n; |
| 1603 | |
| 1604 | buf += n; |
| 1605 | break; /* makes device work like a pipe */ |
| 1606 | } |
| 1607 | set_current_state(TASK_RUNNING); |
| 1608 | remove_wait_queue(&async->wait_head, &wait); |
| 1609 | |
| 1610 | done: |
| 1611 | return (count ? count : retval); |
| 1612 | } |
| 1613 | |
| 1614 | static ssize_t comedi_read(struct file *file, char *buf, size_t nbytes, |
| 1615 | loff_t * offset) |
| 1616 | { |
| 1617 | comedi_subdevice *s; |
| 1618 | comedi_async *async; |
| 1619 | int n, m, count = 0, retval = 0; |
| 1620 | DECLARE_WAITQUEUE(wait, current); |
| 1621 | const unsigned minor = iminor(file->f_dentry->d_inode); |
| 1622 | struct comedi_device_file_info *dev_file_info = comedi_get_device_file_info(minor); |
| 1623 | comedi_device *dev = dev_file_info->device; |
| 1624 | |
| 1625 | if (!dev->attached) { |
| 1626 | DPRINTK("no driver configured on comedi%i\n", dev->minor); |
| 1627 | retval = -ENODEV; |
| 1628 | goto done; |
| 1629 | } |
| 1630 | |
| 1631 | s = comedi_get_read_subdevice(dev_file_info); |
| 1632 | if (s == NULL) { |
| 1633 | retval = -EIO; |
| 1634 | goto done; |
| 1635 | } |
| 1636 | async = s->async; |
| 1637 | if (!nbytes) { |
| 1638 | retval = 0; |
| 1639 | goto done; |
| 1640 | } |
| 1641 | if (!s->busy) { |
| 1642 | retval = 0; |
| 1643 | goto done; |
| 1644 | } |
| 1645 | if (s->busy != file) { |
| 1646 | retval = -EACCES; |
| 1647 | goto done; |
| 1648 | } |
| 1649 | |
| 1650 | add_wait_queue(&async->wait_head, &wait); |
| 1651 | while (nbytes > 0 && !retval) { |
| 1652 | set_current_state(TASK_INTERRUPTIBLE); |
| 1653 | |
| 1654 | n = nbytes; |
| 1655 | |
| 1656 | m = comedi_buf_read_n_available(async); |
| 1657 | //printk("%d available\n",m); |
| 1658 | if (async->buf_read_ptr + m > async->prealloc_bufsz) { |
| 1659 | m = async->prealloc_bufsz - async->buf_read_ptr; |
| 1660 | } |
| 1661 | //printk("%d contiguous\n",m); |
| 1662 | if (m < n) |
| 1663 | n = m; |
| 1664 | |
| 1665 | if (n == 0) { |
| 1666 | if (!(comedi_get_subdevice_runflags(s) & SRF_RUNNING)) { |
| 1667 | do_become_nonbusy(dev, s); |
| 1668 | if (comedi_get_subdevice_runflags(s) & |
| 1669 | SRF_ERROR) { |
| 1670 | retval = -EPIPE; |
| 1671 | } else { |
| 1672 | retval = 0; |
| 1673 | } |
| 1674 | break; |
| 1675 | } |
| 1676 | if (file->f_flags & O_NONBLOCK) { |
| 1677 | retval = -EAGAIN; |
| 1678 | break; |
| 1679 | } |
| 1680 | if (signal_pending(current)) { |
| 1681 | retval = -ERESTARTSYS; |
| 1682 | break; |
| 1683 | } |
| 1684 | schedule(); |
| 1685 | if (!s->busy) { |
| 1686 | retval = 0; |
| 1687 | break; |
| 1688 | } |
| 1689 | if (s->busy != file) { |
| 1690 | retval = -EACCES; |
| 1691 | break; |
| 1692 | } |
| 1693 | continue; |
| 1694 | } |
| 1695 | m = copy_to_user(buf, async->prealloc_buf + |
| 1696 | async->buf_read_ptr, n); |
| 1697 | if (m) { |
| 1698 | n -= m; |
| 1699 | retval = -EFAULT; |
| 1700 | } |
| 1701 | |
| 1702 | comedi_buf_read_alloc(async, n); |
| 1703 | comedi_buf_read_free(async, n); |
| 1704 | |
| 1705 | count += n; |
| 1706 | nbytes -= n; |
| 1707 | |
| 1708 | buf += n; |
| 1709 | break; /* makes device work like a pipe */ |
| 1710 | } |
| 1711 | if (!(comedi_get_subdevice_runflags(s) & (SRF_ERROR | SRF_RUNNING)) && |
| 1712 | async->buf_read_count - async->buf_write_count == 0) { |
| 1713 | do_become_nonbusy(dev, s); |
| 1714 | } |
| 1715 | set_current_state(TASK_RUNNING); |
| 1716 | remove_wait_queue(&async->wait_head, &wait); |
| 1717 | |
| 1718 | done: |
| 1719 | return (count ? count : retval); |
| 1720 | } |
| 1721 | |
| 1722 | /* |
| 1723 | This function restores a subdevice to an idle state. |
| 1724 | */ |
| 1725 | void do_become_nonbusy(comedi_device * dev, comedi_subdevice * s) |
| 1726 | { |
| 1727 | comedi_async *async = s->async; |
| 1728 | |
| 1729 | comedi_set_subdevice_runflags(s, SRF_RUNNING, 0); |
| 1730 | #ifdef CONFIG_COMEDI_RT |
| 1731 | if (comedi_get_subdevice_runflags(s) & SRF_RT) { |
| 1732 | comedi_switch_to_non_rt(dev); |
| 1733 | comedi_set_subdevice_runflags(s, SRF_RT, 0); |
| 1734 | } |
| 1735 | #endif |
| 1736 | if (async) { |
| 1737 | comedi_reset_async_buf(async); |
| 1738 | async->inttrig = NULL; |
| 1739 | } else { |
| 1740 | printk("BUG: (?) do_become_nonbusy called with async=0\n"); |
| 1741 | } |
| 1742 | |
| 1743 | s->busy = NULL; |
| 1744 | } |
| 1745 | |
| 1746 | static int comedi_open(struct inode *inode, struct file *file) |
| 1747 | { |
| 1748 | char mod[32]; |
| 1749 | const unsigned minor = iminor(inode); |
| 1750 | struct comedi_device_file_info *dev_file_info = comedi_get_device_file_info(minor); |
| 1751 | comedi_device *dev = dev_file_info->device; |
| 1752 | if (dev == NULL) { |
| 1753 | DPRINTK("invalid minor number\n"); |
| 1754 | return -ENODEV; |
| 1755 | } |
| 1756 | |
| 1757 | /* This is slightly hacky, but we want module autoloading |
| 1758 | * to work for root. |
| 1759 | * case: user opens device, attached -> ok |
| 1760 | * case: user opens device, unattached, in_request_module=0 -> autoload |
| 1761 | * case: user opens device, unattached, in_request_module=1 -> fail |
| 1762 | * case: root opens device, attached -> ok |
| 1763 | * case: root opens device, unattached, in_request_module=1 -> ok |
| 1764 | * (typically called from modprobe) |
| 1765 | * case: root opens device, unattached, in_request_module=0 -> autoload |
| 1766 | * |
| 1767 | * The last could be changed to "-> ok", which would deny root |
| 1768 | * autoloading. |
| 1769 | */ |
| 1770 | mutex_lock(&dev->mutex); |
| 1771 | if (dev->attached) |
| 1772 | goto ok; |
| 1773 | if (!capable(CAP_SYS_MODULE) && dev->in_request_module) { |
| 1774 | DPRINTK("in request module\n"); |
| 1775 | mutex_unlock(&dev->mutex); |
| 1776 | return -ENODEV; |
| 1777 | } |
| 1778 | if (capable(CAP_SYS_MODULE) && dev->in_request_module) |
| 1779 | goto ok; |
| 1780 | |
| 1781 | dev->in_request_module = 1; |
| 1782 | |
| 1783 | sprintf(mod, "char-major-%i-%i", COMEDI_MAJOR, dev->minor); |
| 1784 | #ifdef CONFIG_KMOD |
| 1785 | mutex_unlock(&dev->mutex); |
| 1786 | request_module(mod); |
| 1787 | mutex_lock(&dev->mutex); |
| 1788 | #endif |
| 1789 | |
| 1790 | dev->in_request_module = 0; |
| 1791 | |
| 1792 | if (!dev->attached && !capable(CAP_SYS_MODULE)) { |
| 1793 | DPRINTK("not attached and not CAP_SYS_MODULE\n"); |
| 1794 | mutex_unlock(&dev->mutex); |
| 1795 | return -ENODEV; |
| 1796 | } |
| 1797 | ok: |
| 1798 | __module_get(THIS_MODULE); |
| 1799 | |
| 1800 | if (dev->attached) { |
| 1801 | if (!try_module_get(dev->driver->module)) { |
| 1802 | module_put(THIS_MODULE); |
| 1803 | mutex_unlock(&dev->mutex); |
| 1804 | return -ENOSYS; |
| 1805 | } |
| 1806 | } |
| 1807 | |
| 1808 | if (dev->attached && dev->use_count == 0 && dev->open) { |
| 1809 | dev->open(dev); |
| 1810 | } |
| 1811 | |
| 1812 | dev->use_count++; |
| 1813 | |
| 1814 | mutex_unlock(&dev->mutex); |
| 1815 | |
| 1816 | return 0; |
| 1817 | } |
| 1818 | |
| 1819 | static int comedi_close(struct inode *inode, struct file *file) |
| 1820 | { |
| 1821 | const unsigned minor = iminor(inode); |
| 1822 | struct comedi_device_file_info *dev_file_info = comedi_get_device_file_info(minor); |
| 1823 | comedi_device *dev = dev_file_info->device; |
| 1824 | comedi_subdevice *s = NULL; |
| 1825 | int i; |
| 1826 | |
| 1827 | mutex_lock(&dev->mutex); |
| 1828 | |
| 1829 | if (dev->subdevices) { |
| 1830 | for (i = 0; i < dev->n_subdevices; i++) { |
| 1831 | s = dev->subdevices + i; |
| 1832 | |
| 1833 | if (s->busy == file) { |
| 1834 | do_cancel(dev, s); |
| 1835 | } |
| 1836 | if (s->lock == file) { |
| 1837 | s->lock = NULL; |
| 1838 | } |
| 1839 | } |
| 1840 | } |
| 1841 | if (dev->attached && dev->use_count == 1 && dev->close) { |
| 1842 | dev->close(dev); |
| 1843 | } |
| 1844 | |
| 1845 | module_put(THIS_MODULE); |
| 1846 | if (dev->attached) { |
| 1847 | module_put(dev->driver->module); |
| 1848 | } |
| 1849 | |
| 1850 | dev->use_count--; |
| 1851 | |
| 1852 | mutex_unlock(&dev->mutex); |
| 1853 | |
| 1854 | if (file->f_flags & FASYNC) { |
| 1855 | comedi_fasync(-1, file, 0); |
| 1856 | } |
| 1857 | |
| 1858 | return 0; |
| 1859 | } |
| 1860 | |
| 1861 | static int comedi_fasync(int fd, struct file *file, int on) |
| 1862 | { |
| 1863 | const unsigned minor = iminor(file->f_dentry->d_inode); |
| 1864 | struct comedi_device_file_info *dev_file_info = comedi_get_device_file_info(minor); |
| 1865 | comedi_device *dev = dev_file_info->device; |
| 1866 | |
| 1867 | return fasync_helper(fd, file, on, &dev->async_queue); |
| 1868 | } |
| 1869 | |
| 1870 | const struct file_operations comedi_fops = { |
| 1871 | owner:THIS_MODULE, |
| 1872 | #ifdef HAVE_UNLOCKED_IOCTL |
| 1873 | unlocked_ioctl:comedi_unlocked_ioctl, |
| 1874 | #else |
| 1875 | ioctl:comedi_ioctl, |
| 1876 | #endif |
| 1877 | #ifdef HAVE_COMPAT_IOCTL |
| 1878 | compat_ioctl:comedi_compat_ioctl, |
| 1879 | #endif |
| 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 | |
| 1889 | struct class *comedi_class = NULL; |
| 1890 | static struct cdev comedi_cdev; |
| 1891 | |
| 1892 | static void comedi_cleanup_legacy_minors(void) |
| 1893 | { |
| 1894 | unsigned i; |
| 1895 | for (i = 0; i < COMEDI_NUM_LEGACY_MINORS; i++) { |
| 1896 | comedi_free_board_minor(i); |
| 1897 | } |
| 1898 | } |
| 1899 | |
| 1900 | static int __init comedi_init(void) |
| 1901 | { |
| 1902 | int i; |
| 1903 | int retval; |
| 1904 | |
| 1905 | printk("comedi: version " COMEDI_RELEASE |
| 1906 | " - http://www.comedi.org\n"); |
| 1907 | |
| 1908 | memset(comedi_file_info_table, 0, sizeof(struct comedi_device_file_info*) * COMEDI_NUM_MINORS); |
| 1909 | |
| 1910 | retval = register_chrdev_region(MKDEV(COMEDI_MAJOR, 0), |
| 1911 | COMEDI_NUM_MINORS, "comedi"); |
| 1912 | if (retval) |
| 1913 | return -EIO; |
| 1914 | cdev_init(&comedi_cdev, &comedi_fops); |
| 1915 | comedi_cdev.owner = THIS_MODULE; |
| 1916 | kobject_set_name(&comedi_cdev.kobj, "comedi"); |
| 1917 | if (cdev_add(&comedi_cdev, MKDEV(COMEDI_MAJOR, 0), COMEDI_NUM_MINORS)) { |
| 1918 | unregister_chrdev_region(MKDEV(COMEDI_MAJOR, 0), |
| 1919 | COMEDI_NUM_MINORS); |
| 1920 | return -EIO; |
| 1921 | } |
| 1922 | comedi_class = class_create(THIS_MODULE, "comedi"); |
| 1923 | if (IS_ERR(comedi_class)) { |
| 1924 | printk("comedi: failed to create class"); |
| 1925 | cdev_del(&comedi_cdev); |
| 1926 | unregister_chrdev_region(MKDEV(COMEDI_MAJOR, 0), |
| 1927 | COMEDI_NUM_MINORS); |
| 1928 | return PTR_ERR(comedi_class); |
| 1929 | } |
| 1930 | |
| 1931 | /* XXX requires /proc interface */ |
| 1932 | comedi_proc_init(); |
| 1933 | |
| 1934 | // create devices files for legacy/manual use |
| 1935 | for (i = 0; i < COMEDI_NUM_LEGACY_MINORS; i++) { |
| 1936 | int minor; |
| 1937 | minor = comedi_alloc_board_minor(NULL); |
| 1938 | if(minor < 0) |
| 1939 | { |
| 1940 | comedi_cleanup_legacy_minors(); |
| 1941 | cdev_del(&comedi_cdev); |
| 1942 | unregister_chrdev_region(MKDEV(COMEDI_MAJOR, 0), |
| 1943 | COMEDI_NUM_MINORS); |
| 1944 | return minor; |
| 1945 | } |
| 1946 | } |
| 1947 | |
| 1948 | comedi_rt_init(); |
| 1949 | |
| 1950 | comedi_register_ioctl32(); |
| 1951 | |
| 1952 | return 0; |
| 1953 | } |
| 1954 | |
| 1955 | static void __exit comedi_cleanup(void) |
| 1956 | { |
| 1957 | int i; |
| 1958 | |
| 1959 | comedi_cleanup_legacy_minors(); |
| 1960 | for(i = 0; i < COMEDI_NUM_MINORS; ++i) |
| 1961 | { |
| 1962 | BUG_ON(comedi_file_info_table[i]); |
| 1963 | } |
| 1964 | |
| 1965 | class_destroy(comedi_class); |
| 1966 | cdev_del(&comedi_cdev); |
| 1967 | unregister_chrdev_region(MKDEV(COMEDI_MAJOR, 0), COMEDI_NUM_MINORS); |
| 1968 | |
| 1969 | comedi_proc_cleanup(); |
| 1970 | |
| 1971 | comedi_rt_cleanup(); |
| 1972 | |
| 1973 | comedi_unregister_ioctl32(); |
| 1974 | } |
| 1975 | |
| 1976 | module_init(comedi_init); |
| 1977 | module_exit(comedi_cleanup); |
| 1978 | |
| 1979 | void comedi_error(const comedi_device * dev, const char *s) |
| 1980 | { |
| 1981 | rt_printk("comedi%d: %s: %s\n", dev->minor, dev->driver->driver_name, |
| 1982 | s); |
| 1983 | } |
| 1984 | |
| 1985 | void comedi_event(comedi_device * dev, comedi_subdevice * s) |
| 1986 | { |
| 1987 | comedi_async *async = s->async; |
| 1988 | unsigned runflags = 0; |
| 1989 | unsigned runflags_mask = 0; |
| 1990 | |
| 1991 | //DPRINTK("comedi_event 0x%x\n",mask); |
| 1992 | |
| 1993 | if ((comedi_get_subdevice_runflags(s) & SRF_RUNNING) == 0) |
| 1994 | return; |
| 1995 | |
| 1996 | if (s->async-> |
| 1997 | events & (COMEDI_CB_EOA | COMEDI_CB_ERROR | COMEDI_CB_OVERFLOW)) |
| 1998 | { |
| 1999 | runflags_mask |= SRF_RUNNING; |
| 2000 | } |
| 2001 | /* remember if an error event has occured, so an error |
| 2002 | * can be returned the next time the user does a read() */ |
| 2003 | if (s->async->events & (COMEDI_CB_ERROR | COMEDI_CB_OVERFLOW)) { |
| 2004 | runflags_mask |= SRF_ERROR; |
| 2005 | runflags |= SRF_ERROR; |
| 2006 | } |
| 2007 | if (runflags_mask) { |
| 2008 | /*sets SRF_ERROR and SRF_RUNNING together atomically */ |
| 2009 | comedi_set_subdevice_runflags(s, runflags_mask, runflags); |
| 2010 | } |
| 2011 | |
| 2012 | if (async->cb_mask & s->async->events) { |
| 2013 | if (comedi_get_subdevice_runflags(s) & SRF_USER) { |
| 2014 | |
| 2015 | if (dev->rt) { |
| 2016 | #ifdef CONFIG_COMEDI_RT |
| 2017 | // pend wake up |
| 2018 | comedi_rt_pend_wakeup(&async->wait_head); |
| 2019 | #else |
| 2020 | printk("BUG: comedi_event() code unreachable\n"); |
| 2021 | #endif |
| 2022 | } else { |
| 2023 | wake_up_interruptible(&async->wait_head); |
| 2024 | if (s->subdev_flags & SDF_CMD_READ) { |
| 2025 | kill_fasync(&dev->async_queue, SIGIO, |
| 2026 | POLL_IN); |
| 2027 | } |
| 2028 | if (s->subdev_flags & SDF_CMD_WRITE) { |
| 2029 | kill_fasync(&dev->async_queue, SIGIO, |
| 2030 | POLL_OUT); |
| 2031 | } |
| 2032 | } |
| 2033 | } else { |
| 2034 | if (async->cb_func) |
| 2035 | async->cb_func(s->async->events, async->cb_arg); |
| 2036 | /* XXX bug here. If subdevice A is rt, and |
| 2037 | * subdevice B tries to callback to a normal |
| 2038 | * linux kernel function, it will be at the |
| 2039 | * wrong priority. Since this isn't very |
| 2040 | * common, I'm not going to worry about it. */ |
| 2041 | } |
| 2042 | } |
| 2043 | s->async->events = 0; |
| 2044 | } |
| 2045 | |
| 2046 | void comedi_set_subdevice_runflags(comedi_subdevice * s, unsigned mask, |
| 2047 | unsigned bits) |
| 2048 | { |
| 2049 | unsigned long flags; |
| 2050 | |
| 2051 | comedi_spin_lock_irqsave(&s->spin_lock, flags); |
| 2052 | s->runflags &= ~mask; |
| 2053 | s->runflags |= (bits & mask); |
| 2054 | comedi_spin_unlock_irqrestore(&s->spin_lock, flags); |
| 2055 | } |
| 2056 | |
| 2057 | unsigned comedi_get_subdevice_runflags(comedi_subdevice * s) |
| 2058 | { |
| 2059 | unsigned long flags; |
| 2060 | unsigned runflags; |
| 2061 | |
| 2062 | comedi_spin_lock_irqsave(&s->spin_lock, flags); |
| 2063 | runflags = s->runflags; |
| 2064 | comedi_spin_unlock_irqrestore(&s->spin_lock, flags); |
| 2065 | return runflags; |
| 2066 | } |
| 2067 | |
| 2068 | static int is_device_busy(comedi_device * dev) |
| 2069 | { |
| 2070 | comedi_subdevice *s; |
| 2071 | int i; |
| 2072 | |
| 2073 | if (!dev->attached) |
| 2074 | return 0; |
| 2075 | |
| 2076 | for (i = 0; i < dev->n_subdevices; i++) { |
| 2077 | s = dev->subdevices + i; |
| 2078 | if (s->busy) |
| 2079 | return 1; |
| 2080 | if (s->async && s->async->mmap_count) |
| 2081 | return 1; |
| 2082 | } |
| 2083 | |
| 2084 | return 0; |
| 2085 | } |
| 2086 | |
| 2087 | void comedi_device_init(comedi_device *dev) |
| 2088 | { |
| 2089 | memset(dev, 0, sizeof(comedi_device)); |
| 2090 | spin_lock_init(&dev->spinlock); |
| 2091 | mutex_init(&dev->mutex); |
| 2092 | dev->minor = -1; |
| 2093 | } |
| 2094 | |
| 2095 | void comedi_device_cleanup(comedi_device *dev) |
| 2096 | { |
| 2097 | if(dev == NULL) return; |
| 2098 | mutex_lock(&dev->mutex); |
| 2099 | comedi_device_detach(dev); |
| 2100 | mutex_unlock(&dev->mutex); |
| 2101 | mutex_destroy(&dev->mutex); |
| 2102 | } |
| 2103 | |
| 2104 | int comedi_alloc_board_minor(struct device *hardware_device) |
| 2105 | { |
| 2106 | unsigned long flags; |
| 2107 | struct comedi_device_file_info *info; |
| 2108 | device_create_result_type *csdev; |
| 2109 | unsigned i; |
| 2110 | |
| 2111 | info = kzalloc(sizeof(struct comedi_device_file_info), GFP_KERNEL); |
| 2112 | if(info == NULL) return -ENOMEM; |
| 2113 | info->device = kzalloc(sizeof(comedi_device), GFP_KERNEL); |
| 2114 | if(info->device == NULL) |
| 2115 | { |
| 2116 | kfree(info); |
| 2117 | return -ENOMEM; |
| 2118 | } |
| 2119 | comedi_device_init(info->device); |
| 2120 | comedi_spin_lock_irqsave(&comedi_file_info_table_lock, flags); |
| 2121 | for(i = 0; i < COMEDI_NUM_BOARD_MINORS; ++i) |
| 2122 | { |
| 2123 | if(comedi_file_info_table[i] == NULL) |
| 2124 | { |
| 2125 | comedi_file_info_table[i] = info; |
| 2126 | break; |
| 2127 | } |
| 2128 | } |
| 2129 | comedi_spin_unlock_irqrestore(&comedi_file_info_table_lock, flags); |
| 2130 | if(i == COMEDI_NUM_BOARD_MINORS) |
| 2131 | { |
| 2132 | comedi_device_cleanup(info->device); |
| 2133 | kfree(info->device); |
| 2134 | kfree(info); |
| 2135 | rt_printk("comedi: error: ran out of minor numbers for board device files.\n"); |
| 2136 | return -EBUSY; |
| 2137 | } |
| 2138 | info->device->minor = i; |
| 2139 | csdev = COMEDI_DEVICE_CREATE(comedi_class, NULL, |
| 2140 | MKDEV(COMEDI_MAJOR, i), NULL, hardware_device, "comedi%i", i); |
| 2141 | if(!IS_ERR(csdev)) { |
| 2142 | info->device->class_dev = csdev; |
| 2143 | } |
| 2144 | return i; |
| 2145 | } |
| 2146 | |
| 2147 | void comedi_free_board_minor(unsigned minor) |
| 2148 | { |
| 2149 | unsigned long flags; |
| 2150 | struct comedi_device_file_info *info; |
| 2151 | |
| 2152 | BUG_ON(minor >= COMEDI_NUM_BOARD_MINORS); |
| 2153 | comedi_spin_lock_irqsave(&comedi_file_info_table_lock, flags); |
| 2154 | info = comedi_file_info_table[minor]; |
| 2155 | comedi_file_info_table[minor] = NULL; |
| 2156 | comedi_spin_unlock_irqrestore(&comedi_file_info_table_lock, flags); |
| 2157 | |
| 2158 | if(info) |
| 2159 | { |
| 2160 | comedi_device *dev = info->device; |
| 2161 | if(dev) |
| 2162 | { |
| 2163 | if(dev->class_dev) |
| 2164 | { |
| 2165 | device_destroy(comedi_class, MKDEV(COMEDI_MAJOR, dev->minor)); |
| 2166 | } |
| 2167 | comedi_device_cleanup(dev); |
| 2168 | kfree(dev); |
| 2169 | } |
| 2170 | kfree(info); |
| 2171 | } |
| 2172 | } |
| 2173 | |
| 2174 | int comedi_alloc_subdevice_minor(comedi_device *dev, comedi_subdevice *s) |
| 2175 | { |
| 2176 | unsigned long flags; |
| 2177 | struct comedi_device_file_info *info; |
| 2178 | device_create_result_type *csdev; |
| 2179 | unsigned i; |
| 2180 | |
| 2181 | info = kmalloc(sizeof(struct comedi_device_file_info), GFP_KERNEL); |
| 2182 | if(info == NULL) return -ENOMEM; |
| 2183 | info->device = dev; |
| 2184 | info->read_subdevice = s; |
| 2185 | info->write_subdevice = s; |
| 2186 | comedi_spin_lock_irqsave(&comedi_file_info_table_lock, flags); |
| 2187 | for(i = COMEDI_FIRST_SUBDEVICE_MINOR; i < COMEDI_NUM_BOARD_MINORS; ++i) |
| 2188 | { |
| 2189 | if(comedi_file_info_table[i] == NULL) |
| 2190 | { |
| 2191 | comedi_file_info_table[i] = info; |
| 2192 | break; |
| 2193 | } |
| 2194 | } |
| 2195 | comedi_spin_unlock_irqrestore(&comedi_file_info_table_lock, flags); |
| 2196 | if(i == COMEDI_NUM_MINORS) |
| 2197 | { |
| 2198 | kfree(info); |
| 2199 | rt_printk("comedi: error: ran out of minor numbers for board device files.\n"); |
| 2200 | return -EBUSY; |
| 2201 | } |
| 2202 | s->minor = i; |
| 2203 | csdev = COMEDI_DEVICE_CREATE(comedi_class, dev->class_dev, |
| 2204 | MKDEV(COMEDI_MAJOR, i), NULL, NULL, "comedi%i_subd%i", dev->minor, (int)(s - dev->subdevices)); |
| 2205 | if(!IS_ERR(csdev)) |
| 2206 | { |
| 2207 | s->class_dev = csdev; |
| 2208 | } |
| 2209 | return i; |
| 2210 | } |
| 2211 | |
| 2212 | void comedi_free_subdevice_minor(comedi_subdevice *s) |
| 2213 | { |
| 2214 | unsigned long flags; |
| 2215 | struct comedi_device_file_info *info; |
| 2216 | |
| 2217 | if(s == NULL) return; |
| 2218 | if(s->minor < 0) return; |
| 2219 | |
| 2220 | BUG_ON(s->minor >= COMEDI_NUM_MINORS); |
| 2221 | BUG_ON(s->minor < COMEDI_FIRST_SUBDEVICE_MINOR); |
| 2222 | |
| 2223 | comedi_spin_lock_irqsave(&comedi_file_info_table_lock, flags); |
| 2224 | info = comedi_file_info_table[s->minor]; |
| 2225 | comedi_file_info_table[s->minor] = NULL; |
| 2226 | comedi_spin_unlock_irqrestore(&comedi_file_info_table_lock, flags); |
| 2227 | |
| 2228 | if(s->class_dev) |
| 2229 | { |
| 2230 | device_destroy(comedi_class, MKDEV(COMEDI_MAJOR, s->minor)); |
| 2231 | s->class_dev = NULL; |
| 2232 | } |
| 2233 | kfree(info); |
| 2234 | } |
| 2235 | |
| 2236 | struct comedi_device_file_info *comedi_get_device_file_info(unsigned minor) |
| 2237 | { |
| 2238 | unsigned long flags; |
| 2239 | struct comedi_device_file_info *info; |
| 2240 | |
| 2241 | BUG_ON(minor >= COMEDI_NUM_MINORS); |
| 2242 | comedi_spin_lock_irqsave(&comedi_file_info_table_lock, flags); |
| 2243 | info = comedi_file_info_table[minor]; |
| 2244 | comedi_spin_unlock_irqrestore(&comedi_file_info_table_lock, flags); |
| 2245 | return info; |
| 2246 | } |