| 1 | /* |
| 2 | comedi/drivers/comedi_bond.c |
| 3 | A Comedi driver to 'bond' or merge multiple drivers and devices as one. |
| 4 | |
| 5 | COMEDI - Linux Control and Measurement Device Interface |
| 6 | Copyright (C) 2000 David A. Schleef <ds@schleef.org> |
| 7 | Copyright (C) 2005 Calin A. Culianu <calin@ajvar.org> |
| 8 | |
| 9 | This program is free software; you can redistribute it and/or modify |
| 10 | it under the terms of the GNU General Public License as published by |
| 11 | the Free Software Foundation; either version 2 of the License, or |
| 12 | (at your option) any later version. |
| 13 | |
| 14 | This program is distributed in the hope that it will be useful, |
| 15 | but WITHOUT ANY WARRANTY; without even the implied warranty of |
| 16 | MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the |
| 17 | GNU General Public License for more details. |
| 18 | |
| 19 | You should have received a copy of the GNU General Public License |
| 20 | along with this program; if not, write to the Free Software |
| 21 | Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA. |
| 22 | |
| 23 | */ |
| 24 | /* |
| 25 | Driver: comedi_bond |
| 26 | Description: A driver to 'bond' (merge) multiple subdevices from multiple |
| 27 | devices together as one. |
| 28 | Devices: |
| 29 | Author: ds |
| 30 | Updated: Mon, 10 Oct 00:18:25 -0500 |
| 31 | Status: works |
| 32 | |
| 33 | This driver allows you to 'bond' (merge) multiple comedi subdevices |
| 34 | (coming from possibly difference boards and/or drivers) together. For |
| 35 | example, if you had a board with 2 different DIO subdevices, and |
| 36 | another with 1 DIO subdevice, you could 'bond' them with this driver |
| 37 | so that they look like one big fat DIO subdevice. This makes writing |
| 38 | applications slightly easier as you don't have to worry about managing |
| 39 | different subdevices in the application -- you just worry about |
| 40 | indexing one linear array of channel id's. |
| 41 | |
| 42 | Right now only DIO subdevices are supported as that's the personal itch |
| 43 | I am scratching with this driver. If you want to add support for AI and AO |
| 44 | subdevs, go right on ahead and do so! |
| 45 | |
| 46 | Commands aren't supported -- although it would be cool if they were. |
| 47 | |
| 48 | Configuration Options: |
| 49 | List of comedi-minors to bond. All subdevices of the same type |
| 50 | within each minor will be concatenated together in the order given here. |
| 51 | */ |
| 52 | |
| 53 | /* |
| 54 | * The previous block comment is used to automatically generate |
| 55 | * documentation in Comedi and Comedilib. The fields: |
| 56 | * |
| 57 | * Driver: the name of the driver |
| 58 | * Description: a short phrase describing the driver. Don't list boards. |
| 59 | * Devices: a full list of the boards that attempt to be supported by |
| 60 | * the driver. Format is "(manufacturer) board name [comedi name]", |
| 61 | * where comedi_name is the name that is used to configure the board. |
| 62 | * See the comment near board_name: in the struct comedi_driver structure |
| 63 | * below. If (manufacturer) or [comedi name] is missing, the previous |
| 64 | * value is used. |
| 65 | * Author: you |
| 66 | * Updated: date when the _documentation_ was last updated. Use 'date -R' |
| 67 | * to get a value for this. |
| 68 | * Status: a one-word description of the status. Valid values are: |
| 69 | * works - driver works correctly on most boards supported, and |
| 70 | * passes comedi_test. |
| 71 | * unknown - unknown. Usually put there by ds. |
| 72 | * experimental - may not work in any particular release. Author |
| 73 | * probably wants assistance testing it. |
| 74 | * bitrotten - driver has not been update in a long time, probably |
| 75 | * doesn't work, and probably is missing support for significant |
| 76 | * Comedi interface features. |
| 77 | * untested - author probably wrote it "blind", and is believed to |
| 78 | * work, but no confirmation. |
| 79 | * |
| 80 | * These headers should be followed by a blank line, and any comments |
| 81 | * you wish to say about the driver. The comment area is the place |
| 82 | * to put any known bugs, limitations, unsupported features, supported |
| 83 | * command triggers, whether or not commands are supported on particular |
| 84 | * subdevices, etc. |
| 85 | * |
| 86 | * Somewhere in the comment should be information about configuration |
| 87 | * options that are used with comedi_config. |
| 88 | */ |
| 89 | |
| 90 | #include "../comedilib.h" |
| 91 | #include "../comedidev.h" |
| 92 | #include <linux/string.h> |
| 93 | |
| 94 | /* The maxiumum number of channels per subdevice. */ |
| 95 | #define MAX_CHANS 256 |
| 96 | |
| 97 | #define MODULE_NAME "comedi_bond" |
| 98 | #ifdef MODULE_LICENSE |
| 99 | MODULE_LICENSE("GPL"); |
| 100 | #endif |
| 101 | #ifndef STR |
| 102 | # define STR1(x) #x |
| 103 | # define STR(x) STR1(x) |
| 104 | #endif |
| 105 | |
| 106 | static int debug; |
| 107 | module_param(debug, int, 0644); |
| 108 | MODULE_PARM_DESC(debug, "If true, print extra cryptic debugging output useful" |
| 109 | "only to developers."); |
| 110 | |
| 111 | #define LOG_MSG(x...) printk(KERN_INFO MODULE_NAME": "x) |
| 112 | #define DEBUG(x...) \ |
| 113 | do { \ |
| 114 | if (debug) \ |
| 115 | printk(KERN_DEBUG MODULE_NAME": DEBUG: "x); \ |
| 116 | } while (0) |
| 117 | #define WARNING(x...) printk(KERN_WARNING MODULE_NAME ": WARNING: "x) |
| 118 | #define ERROR(x...) printk(KERN_ERR MODULE_NAME ": INTERNAL ERROR: "x) |
| 119 | MODULE_AUTHOR("Calin A. Culianu"); |
| 120 | MODULE_DESCRIPTION(MODULE_NAME "A driver for COMEDI to bond multiple COMEDI " |
| 121 | "devices together as one. In the words of John Lennon: " |
| 122 | "'And the world will live as one...'"); |
| 123 | |
| 124 | /* |
| 125 | * Board descriptions for two imaginary boards. Describing the |
| 126 | * boards in this way is optional, and completely driver-dependent. |
| 127 | * Some drivers use arrays such as this, other do not. |
| 128 | */ |
| 129 | struct BondingBoard { |
| 130 | const char *name; |
| 131 | }; |
| 132 | |
| 133 | static const struct BondingBoard bondingBoards[] = { |
| 134 | { |
| 135 | .name = MODULE_NAME, |
| 136 | }, |
| 137 | }; |
| 138 | |
| 139 | /* |
| 140 | * Useful for shorthand access to the particular board structure |
| 141 | */ |
| 142 | #define thisboard ((const struct BondingBoard *)dev->board_ptr) |
| 143 | |
| 144 | struct BondedDevice { |
| 145 | void *dev; |
| 146 | unsigned minor; |
| 147 | unsigned subdev; |
| 148 | unsigned subdev_type; |
| 149 | unsigned nchans; |
| 150 | unsigned chanid_offset; /* The offset into our unified linear |
| 151 | channel-id's of chanid 0 on this |
| 152 | subdevice. */ |
| 153 | }; |
| 154 | |
| 155 | /* this structure is for data unique to this hardware driver. If |
| 156 | several hardware drivers keep similar information in this structure, |
| 157 | feel free to suggest moving the variable to the struct comedi_device struct. */ |
| 158 | struct Private { |
| 159 | # define MAX_BOARD_NAME 256 |
| 160 | char name[MAX_BOARD_NAME]; |
| 161 | struct BondedDevice **devs; |
| 162 | unsigned ndevs; |
| 163 | struct BondedDevice *chanIdDevMap[MAX_CHANS]; |
| 164 | unsigned nchans; |
| 165 | }; |
| 166 | |
| 167 | /* |
| 168 | * most drivers define the following macro to make it easy to |
| 169 | * access the private structure. |
| 170 | */ |
| 171 | #define devpriv ((struct Private *)dev->private) |
| 172 | |
| 173 | /* |
| 174 | * The struct comedi_driver structure tells the Comedi core module |
| 175 | * which functions to call to configure/deconfigure (attach/detach) |
| 176 | * the board, and also about the kernel module that contains |
| 177 | * the device code. |
| 178 | */ |
| 179 | static int bonding_attach(struct comedi_device *dev, comedi_devconfig *it); |
| 180 | static int bonding_detach(struct comedi_device *dev); |
| 181 | /** Build Private array of all devices.. */ |
| 182 | static int doDevConfig(struct comedi_device *dev, comedi_devconfig *it); |
| 183 | static void doDevUnconfig(struct comedi_device *dev); |
| 184 | /* Ugly implementation of realloc that always copies memory around -- I'm lazy, |
| 185 | * what can I say? I like to do wasteful memcopies.. :) */ |
| 186 | static void *Realloc(const void *ptr, size_t len, size_t old_len); |
| 187 | |
| 188 | static struct comedi_driver driver_bonding = { |
| 189 | .driver_name = MODULE_NAME, |
| 190 | .module = THIS_MODULE, |
| 191 | .attach = bonding_attach, |
| 192 | .detach = bonding_detach, |
| 193 | /* It is not necessary to implement the following members if you are |
| 194 | * writing a driver for a ISA PnP or PCI card */ |
| 195 | /* Most drivers will support multiple types of boards by |
| 196 | * having an array of board structures. These were defined |
| 197 | * in skel_boards[] above. Note that the element 'name' |
| 198 | * was first in the structure -- Comedi uses this fact to |
| 199 | * extract the name of the board without knowing any details |
| 200 | * about the structure except for its length. |
| 201 | * When a device is attached (by comedi_config), the name |
| 202 | * of the device is given to Comedi, and Comedi tries to |
| 203 | * match it by going through the list of board names. If |
| 204 | * there is a match, the address of the pointer is put |
| 205 | * into dev->board_ptr and driver->attach() is called. |
| 206 | * |
| 207 | * Note that these are not necessary if you can determine |
| 208 | * the type of board in software. ISA PnP, PCI, and PCMCIA |
| 209 | * devices are such boards. |
| 210 | */ |
| 211 | .board_name = &bondingBoards[0].name, |
| 212 | .offset = sizeof(struct BondingBoard), |
| 213 | .num_names = sizeof(bondingBoards) / sizeof(struct BondingBoard), |
| 214 | }; |
| 215 | |
| 216 | static int bonding_dio_insn_bits(struct comedi_device *dev, struct comedi_subdevice *s, |
| 217 | struct comedi_insn *insn, unsigned int *data); |
| 218 | static int bonding_dio_insn_config(struct comedi_device *dev, struct comedi_subdevice *s, |
| 219 | struct comedi_insn *insn, unsigned int *data); |
| 220 | |
| 221 | /* |
| 222 | * Attach is called by the Comedi core to configure the driver |
| 223 | * for a particular board. If you specified a board_name array |
| 224 | * in the driver structure, dev->board_ptr contains that |
| 225 | * address. |
| 226 | */ |
| 227 | static int bonding_attach(struct comedi_device *dev, comedi_devconfig *it) |
| 228 | { |
| 229 | struct comedi_subdevice *s; |
| 230 | |
| 231 | LOG_MSG("comedi%d\n", dev->minor); |
| 232 | |
| 233 | /* |
| 234 | * Allocate the private structure area. alloc_private() is a |
| 235 | * convenient macro defined in comedidev.h. |
| 236 | */ |
| 237 | if (alloc_private(dev, sizeof(struct Private)) < 0) |
| 238 | return -ENOMEM; |
| 239 | |
| 240 | /* |
| 241 | * Setup our bonding from config params.. sets up our Private struct.. |
| 242 | */ |
| 243 | if (!doDevConfig(dev, it)) |
| 244 | return -EINVAL; |
| 245 | |
| 246 | /* |
| 247 | * Initialize dev->board_name. Note that we can use the "thisboard" |
| 248 | * macro now, since we just initialized it in the last line. |
| 249 | */ |
| 250 | dev->board_name = devpriv->name; |
| 251 | |
| 252 | /* |
| 253 | * Allocate the subdevice structures. alloc_subdevice() is a |
| 254 | * convenient macro defined in comedidev.h. |
| 255 | */ |
| 256 | if (alloc_subdevices(dev, 1) < 0) |
| 257 | return -ENOMEM; |
| 258 | |
| 259 | s = dev->subdevices + 0; |
| 260 | s->type = COMEDI_SUBD_DIO; |
| 261 | s->subdev_flags = SDF_READABLE | SDF_WRITABLE; |
| 262 | s->n_chan = devpriv->nchans; |
| 263 | s->maxdata = 1; |
| 264 | s->range_table = &range_digital; |
| 265 | s->insn_bits = bonding_dio_insn_bits; |
| 266 | s->insn_config = bonding_dio_insn_config; |
| 267 | |
| 268 | LOG_MSG("attached with %u DIO channels coming from %u different " |
| 269 | "subdevices all bonded together. " |
| 270 | "John Lennon would be proud!\n", |
| 271 | devpriv->nchans, devpriv->ndevs); |
| 272 | |
| 273 | return 1; |
| 274 | } |
| 275 | |
| 276 | /* |
| 277 | * _detach is called to deconfigure a device. It should deallocate |
| 278 | * resources. |
| 279 | * This function is also called when _attach() fails, so it should be |
| 280 | * careful not to release resources that were not necessarily |
| 281 | * allocated by _attach(). dev->private and dev->subdevices are |
| 282 | * deallocated automatically by the core. |
| 283 | */ |
| 284 | static int bonding_detach(struct comedi_device *dev) |
| 285 | { |
| 286 | LOG_MSG("comedi%d: remove\n", dev->minor); |
| 287 | doDevUnconfig(dev); |
| 288 | return 0; |
| 289 | } |
| 290 | |
| 291 | /* DIO devices are slightly special. Although it is possible to |
| 292 | * implement the insn_read/insn_write interface, it is much more |
| 293 | * useful to applications if you implement the insn_bits interface. |
| 294 | * This allows packed reading/writing of the DIO channels. The |
| 295 | * comedi core can convert between insn_bits and insn_read/write */ |
| 296 | static int bonding_dio_insn_bits(struct comedi_device *dev, struct comedi_subdevice *s, |
| 297 | struct comedi_insn *insn, unsigned int *data) |
| 298 | { |
| 299 | #define LSAMPL_BITS (sizeof(unsigned int)*8) |
| 300 | unsigned nchans = LSAMPL_BITS, num_done = 0, i; |
| 301 | if (insn->n != 2) |
| 302 | return -EINVAL; |
| 303 | |
| 304 | if (devpriv->nchans < nchans) |
| 305 | nchans = devpriv->nchans; |
| 306 | |
| 307 | /* The insn data is a mask in data[0] and the new data |
| 308 | * in data[1], each channel cooresponding to a bit. */ |
| 309 | for (i = 0; num_done < nchans && i < devpriv->ndevs; ++i) { |
| 310 | struct BondedDevice *bdev = devpriv->devs[i]; |
| 311 | /* Grab the channel mask and data of only the bits corresponding |
| 312 | to this subdevice.. need to shift them to zero position of |
| 313 | course. */ |
| 314 | /* Bits corresponding to this subdev. */ |
| 315 | unsigned int subdevMask = ((1 << bdev->nchans) - 1); |
| 316 | unsigned int writeMask, dataBits; |
| 317 | |
| 318 | /* Argh, we have >= LSAMPL_BITS chans.. take all bits */ |
| 319 | if (bdev->nchans >= LSAMPL_BITS) |
| 320 | subdevMask = (unsigned int) (-1); |
| 321 | |
| 322 | writeMask = (data[0] >> num_done) & subdevMask; |
| 323 | dataBits = (data[1] >> num_done) & subdevMask; |
| 324 | |
| 325 | /* Read/Write the new digital lines */ |
| 326 | if (comedi_dio_bitfield(bdev->dev, bdev->subdev, writeMask, |
| 327 | &dataBits) != 2) |
| 328 | return -EINVAL; |
| 329 | |
| 330 | /* Make room for the new bits in data[1], the return value */ |
| 331 | data[1] &= ~(subdevMask << num_done); |
| 332 | /* Put the bits in the return value */ |
| 333 | data[1] |= (dataBits & subdevMask) << num_done; |
| 334 | /* Save the new bits to the saved state.. */ |
| 335 | s->state = data[1]; |
| 336 | |
| 337 | num_done += bdev->nchans; |
| 338 | } |
| 339 | |
| 340 | return insn->n; |
| 341 | } |
| 342 | |
| 343 | static int bonding_dio_insn_config(struct comedi_device *dev, struct comedi_subdevice *s, |
| 344 | struct comedi_insn *insn, unsigned int *data) |
| 345 | { |
| 346 | int chan = CR_CHAN(insn->chanspec), ret, io_bits = s->io_bits; |
| 347 | unsigned int io; |
| 348 | struct BondedDevice *bdev; |
| 349 | |
| 350 | if (chan < 0 || chan >= devpriv->nchans) |
| 351 | return -EINVAL; |
| 352 | bdev = devpriv->chanIdDevMap[chan]; |
| 353 | |
| 354 | /* The input or output configuration of each digital line is |
| 355 | * configured by a special insn_config instruction. chanspec |
| 356 | * contains the channel to be changed, and data[0] contains the |
| 357 | * value COMEDI_INPUT or COMEDI_OUTPUT. */ |
| 358 | switch (data[0]) { |
| 359 | case INSN_CONFIG_DIO_OUTPUT: |
| 360 | io = COMEDI_OUTPUT; /* is this really necessary? */ |
| 361 | io_bits |= 1 << chan; |
| 362 | break; |
| 363 | case INSN_CONFIG_DIO_INPUT: |
| 364 | io = COMEDI_INPUT; /* is this really necessary? */ |
| 365 | io_bits &= ~(1 << chan); |
| 366 | break; |
| 367 | case INSN_CONFIG_DIO_QUERY: |
| 368 | data[1] = |
| 369 | (io_bits & (1 << chan)) ? COMEDI_OUTPUT : COMEDI_INPUT; |
| 370 | return insn->n; |
| 371 | break; |
| 372 | default: |
| 373 | return -EINVAL; |
| 374 | break; |
| 375 | } |
| 376 | /* 'real' channel id for this subdev.. */ |
| 377 | chan -= bdev->chanid_offset; |
| 378 | ret = comedi_dio_config(bdev->dev, bdev->subdev, chan, io); |
| 379 | if (ret != 1) |
| 380 | return -EINVAL; |
| 381 | /* Finally, save the new io_bits values since we didn't get |
| 382 | an error above. */ |
| 383 | s->io_bits = io_bits; |
| 384 | return insn->n; |
| 385 | } |
| 386 | |
| 387 | static void *Realloc(const void *oldmem, size_t newlen, size_t oldlen) |
| 388 | { |
| 389 | void *newmem = kmalloc(newlen, GFP_KERNEL); |
| 390 | |
| 391 | if (newmem && oldmem) |
| 392 | memcpy(newmem, oldmem, min(oldlen, newlen)); |
| 393 | kfree(oldmem); |
| 394 | return newmem; |
| 395 | } |
| 396 | |
| 397 | static int doDevConfig(struct comedi_device *dev, comedi_devconfig *it) |
| 398 | { |
| 399 | int i; |
| 400 | void *devs_opened[COMEDI_NUM_BOARD_MINORS]; |
| 401 | |
| 402 | memset(devs_opened, 0, sizeof(devs_opened)); |
| 403 | devpriv->name[0] = 0;; |
| 404 | /* Loop through all comedi devices specified on the command-line, |
| 405 | building our device list */ |
| 406 | for (i = 0; i < COMEDI_NDEVCONFOPTS && (!i || it->options[i]); ++i) { |
| 407 | char file[] = "/dev/comediXXXXXX"; |
| 408 | int minor = it->options[i]; |
| 409 | void *d; |
| 410 | int sdev = -1, nchans, tmp; |
| 411 | struct BondedDevice *bdev = NULL; |
| 412 | |
| 413 | if (minor < 0 || minor > COMEDI_NUM_BOARD_MINORS) { |
| 414 | ERROR("Minor %d is invalid!\n", minor); |
| 415 | return 0; |
| 416 | } |
| 417 | if (minor == dev->minor) { |
| 418 | ERROR("Cannot bond this driver to itself!\n"); |
| 419 | return 0; |
| 420 | } |
| 421 | if (devs_opened[minor]) { |
| 422 | ERROR("Minor %d specified more than once!\n", minor); |
| 423 | return 0; |
| 424 | } |
| 425 | |
| 426 | snprintf(file, sizeof(file), "/dev/comedi%u", minor); |
| 427 | file[sizeof(file) - 1] = 0; |
| 428 | |
| 429 | d = devs_opened[minor] = comedi_open(file); |
| 430 | |
| 431 | if (!d) { |
| 432 | ERROR("Minor %u could not be opened\n", minor); |
| 433 | return 0; |
| 434 | } |
| 435 | |
| 436 | /* Do DIO, as that's all we support now.. */ |
| 437 | while ((sdev = comedi_find_subdevice_by_type(d, COMEDI_SUBD_DIO, |
| 438 | sdev + 1)) > -1) { |
| 439 | nchans = comedi_get_n_channels(d, sdev); |
| 440 | if (nchans <= 0) { |
| 441 | ERROR("comedi_get_n_channels() returned %d " |
| 442 | "on minor %u subdev %d!\n", |
| 443 | nchans, minor, sdev); |
| 444 | return 0; |
| 445 | } |
| 446 | bdev = kmalloc(sizeof(*bdev), GFP_KERNEL); |
| 447 | if (!bdev) { |
| 448 | ERROR("Out of memory.\n"); |
| 449 | return 0; |
| 450 | } |
| 451 | bdev->dev = d; |
| 452 | bdev->minor = minor; |
| 453 | bdev->subdev = sdev; |
| 454 | bdev->subdev_type = COMEDI_SUBD_DIO; |
| 455 | bdev->nchans = nchans; |
| 456 | bdev->chanid_offset = devpriv->nchans; |
| 457 | |
| 458 | /* map channel id's to BondedDevice * pointer.. */ |
| 459 | while (nchans--) |
| 460 | devpriv->chanIdDevMap[devpriv->nchans++] = bdev; |
| 461 | |
| 462 | /* Now put bdev pointer at end of devpriv->devs array |
| 463 | * list.. */ |
| 464 | |
| 465 | /* ergh.. ugly.. we need to realloc :( */ |
| 466 | tmp = devpriv->ndevs * sizeof(bdev); |
| 467 | devpriv->devs = |
| 468 | Realloc(devpriv->devs, |
| 469 | ++devpriv->ndevs * sizeof(bdev), tmp); |
| 470 | if (!devpriv->devs) { |
| 471 | ERROR("Could not allocate memory. " |
| 472 | "Out of memory?"); |
| 473 | return 0; |
| 474 | } |
| 475 | |
| 476 | devpriv->devs[devpriv->ndevs - 1] = bdev; |
| 477 | { |
| 478 | /** Append dev:subdev to devpriv->name */ |
| 479 | char buf[20]; |
| 480 | int left = |
| 481 | MAX_BOARD_NAME - strlen(devpriv->name) - |
| 482 | 1; |
| 483 | snprintf(buf, sizeof(buf), "%d:%d ", dev->minor, |
| 484 | bdev->subdev); |
| 485 | buf[sizeof(buf) - 1] = 0; |
| 486 | strncat(devpriv->name, buf, left); |
| 487 | } |
| 488 | |
| 489 | } |
| 490 | } |
| 491 | |
| 492 | if (!devpriv->nchans) { |
| 493 | ERROR("No channels found!\n"); |
| 494 | return 0; |
| 495 | } |
| 496 | |
| 497 | return 1; |
| 498 | } |
| 499 | |
| 500 | static void doDevUnconfig(struct comedi_device *dev) |
| 501 | { |
| 502 | unsigned long devs_closed = 0; |
| 503 | |
| 504 | if (devpriv) { |
| 505 | while (devpriv->ndevs-- && devpriv->devs) { |
| 506 | struct BondedDevice *bdev; |
| 507 | |
| 508 | bdev = devpriv->devs[devpriv->ndevs]; |
| 509 | if (!bdev) |
| 510 | continue; |
| 511 | if (!(devs_closed & (0x1 << bdev->minor))) { |
| 512 | comedi_close(bdev->dev); |
| 513 | devs_closed |= (0x1 << bdev->minor); |
| 514 | } |
| 515 | kfree(bdev); |
| 516 | } |
| 517 | kfree(devpriv->devs); |
| 518 | devpriv->devs = NULL; |
| 519 | kfree(devpriv); |
| 520 | dev->private = NULL; |
| 521 | } |
| 522 | } |
| 523 | |
| 524 | static int __init init(void) |
| 525 | { |
| 526 | return comedi_driver_register(&driver_bonding); |
| 527 | } |
| 528 | |
| 529 | static void __exit cleanup(void) |
| 530 | { |
| 531 | comedi_driver_unregister(&driver_bonding); |
| 532 | } |
| 533 | |
| 534 | module_init(init); |
| 535 | module_exit(cleanup); |