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