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Commit | Line | Data |
---|---|---|
ed9eccbe DS |
1 | /* |
2 | module/drivers.c | |
3 | functions for manipulating drivers | |
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. | |
ed9eccbe DS |
17 | */ |
18 | ||
ed9eccbe DS |
19 | #include <linux/device.h> |
20 | #include <linux/module.h> | |
ed9eccbe | 21 | #include <linux/errno.h> |
78b10615 | 22 | #include <linux/kconfig.h> |
ed9eccbe DS |
23 | #include <linux/kernel.h> |
24 | #include <linux/sched.h> | |
25 | #include <linux/fcntl.h> | |
26 | #include <linux/delay.h> | |
27 | #include <linux/ioport.h> | |
28 | #include <linux/mm.h> | |
29 | #include <linux/slab.h> | |
ed9eccbe DS |
30 | #include <linux/highmem.h> /* for SuSE brokenness */ |
31 | #include <linux/vmalloc.h> | |
32 | #include <linux/cdev.h> | |
33 | #include <linux/dma-mapping.h> | |
5617f9da | 34 | #include <linux/io.h> |
3d1fe3f7 | 35 | #include <linux/interrupt.h> |
9ff8b151 | 36 | #include <linux/firmware.h> |
ed9eccbe | 37 | |
242e7ad9 | 38 | #include "comedidev.h" |
3a5fa275 | 39 | #include "comedi_internal.h" |
242e7ad9 | 40 | |
139dfbdf | 41 | struct comedi_driver *comedi_drivers; |
ed9eccbe | 42 | |
da717511 IA |
43 | int comedi_set_hw_dev(struct comedi_device *dev, struct device *hw_dev) |
44 | { | |
de06d7c6 IA |
45 | if (hw_dev == dev->hw_dev) |
46 | return 0; | |
47 | if (dev->hw_dev != NULL) | |
48 | return -EEXIST; | |
da717511 | 49 | dev->hw_dev = get_device(hw_dev); |
da717511 IA |
50 | return 0; |
51 | } | |
52 | EXPORT_SYMBOL_GPL(comedi_set_hw_dev); | |
53 | ||
de06d7c6 IA |
54 | static void comedi_clear_hw_dev(struct comedi_device *dev) |
55 | { | |
56 | put_device(dev->hw_dev); | |
57 | dev->hw_dev = NULL; | |
58 | } | |
59 | ||
8b9ba6e5 | 60 | int comedi_alloc_subdevices(struct comedi_device *dev, int num_subdevices) |
2f0b9d08 | 61 | { |
03afcf47 | 62 | struct comedi_subdevice *s; |
8b9ba6e5 | 63 | int i; |
2f0b9d08 | 64 | |
7f801c41 HS |
65 | if (num_subdevices < 1) |
66 | return -EINVAL; | |
03afcf47 HS |
67 | |
68 | s = kcalloc(num_subdevices, sizeof(*s), GFP_KERNEL); | |
69 | if (!s) | |
2f0b9d08 | 70 | return -ENOMEM; |
03afcf47 | 71 | dev->subdevices = s; |
fba1d0fa | 72 | dev->n_subdevices = num_subdevices; |
03afcf47 | 73 | |
2f0b9d08 | 74 | for (i = 0; i < num_subdevices; ++i) { |
5e4c58ce | 75 | s = &dev->subdevices[i]; |
03afcf47 | 76 | s->device = dev; |
90a35c15 | 77 | s->index = i; |
03afcf47 HS |
78 | s->async_dma_dir = DMA_NONE; |
79 | spin_lock_init(&s->spin_lock); | |
80 | s->minor = -1; | |
2f0b9d08 HS |
81 | } |
82 | return 0; | |
83 | } | |
84 | EXPORT_SYMBOL_GPL(comedi_alloc_subdevices); | |
85 | ||
71b5f4f1 | 86 | static void cleanup_device(struct comedi_device *dev) |
ed9eccbe DS |
87 | { |
88 | int i; | |
34c43922 | 89 | struct comedi_subdevice *s; |
ed9eccbe DS |
90 | |
91 | if (dev->subdevices) { | |
92 | for (i = 0; i < dev->n_subdevices; i++) { | |
5e4c58ce | 93 | s = &dev->subdevices[i]; |
588ba6dc HS |
94 | if (s->runflags & SRF_FREE_SPRIV) |
95 | kfree(s->private); | |
ed9eccbe DS |
96 | comedi_free_subdevice_minor(s); |
97 | if (s->async) { | |
98 | comedi_buf_alloc(dev, s, 0); | |
99 | kfree(s->async); | |
100 | } | |
101 | } | |
102 | kfree(dev->subdevices); | |
103 | dev->subdevices = NULL; | |
104 | dev->n_subdevices = 0; | |
105 | } | |
dedd1325 BP |
106 | kfree(dev->private); |
107 | dev->private = NULL; | |
7029a874 | 108 | dev->driver = NULL; |
ed9eccbe DS |
109 | dev->board_name = NULL; |
110 | dev->board_ptr = NULL; | |
111 | dev->iobase = 0; | |
316f97f1 | 112 | dev->iolen = 0; |
00ca6884 | 113 | dev->ioenabled = false; |
ed9eccbe DS |
114 | dev->irq = 0; |
115 | dev->read_subdev = NULL; | |
116 | dev->write_subdev = NULL; | |
117 | dev->open = NULL; | |
118 | dev->close = NULL; | |
de06d7c6 | 119 | comedi_clear_hw_dev(dev); |
ed9eccbe DS |
120 | } |
121 | ||
016599f5 | 122 | void comedi_device_detach(struct comedi_device *dev) |
ed9eccbe | 123 | { |
a7401cdd | 124 | dev->attached = false; |
5617f9da | 125 | if (dev->driver) |
ed9eccbe | 126 | dev->driver->detach(dev); |
ed9eccbe DS |
127 | cleanup_device(dev); |
128 | } | |
129 | ||
01fca378 | 130 | static int poll_invalid(struct comedi_device *dev, struct comedi_subdevice *s) |
ed9eccbe | 131 | { |
01fca378 | 132 | return -EINVAL; |
ed9eccbe DS |
133 | } |
134 | ||
01fca378 HS |
135 | int insn_inval(struct comedi_device *dev, struct comedi_subdevice *s, |
136 | struct comedi_insn *insn, unsigned int *data) | |
ed9eccbe | 137 | { |
01fca378 | 138 | return -EINVAL; |
ed9eccbe DS |
139 | } |
140 | ||
01fca378 HS |
141 | static int insn_rw_emulate_bits(struct comedi_device *dev, |
142 | struct comedi_subdevice *s, | |
143 | struct comedi_insn *insn, unsigned int *data) | |
ed9eccbe | 144 | { |
01fca378 HS |
145 | struct comedi_insn new_insn; |
146 | int ret; | |
147 | static const unsigned channels_per_bitfield = 32; | |
ed9eccbe | 148 | |
01fca378 HS |
149 | unsigned chan = CR_CHAN(insn->chanspec); |
150 | const unsigned base_bitfield_channel = | |
151 | (chan < channels_per_bitfield) ? 0 : chan; | |
152 | unsigned int new_data[2]; | |
153 | memset(new_data, 0, sizeof(new_data)); | |
154 | memset(&new_insn, 0, sizeof(new_insn)); | |
155 | new_insn.insn = INSN_BITS; | |
156 | new_insn.chanspec = base_bitfield_channel; | |
157 | new_insn.n = 2; | |
158 | new_insn.subdev = insn->subdev; | |
ed9eccbe | 159 | |
01fca378 HS |
160 | if (insn->insn == INSN_WRITE) { |
161 | if (!(s->subdev_flags & SDF_WRITABLE)) | |
162 | return -EINVAL; | |
163 | new_data[0] = 1 << (chan - base_bitfield_channel); /* mask */ | |
164 | new_data[1] = data[0] ? (1 << (chan - base_bitfield_channel)) | |
165 | : 0; /* bits */ | |
ed9eccbe DS |
166 | } |
167 | ||
01fca378 HS |
168 | ret = s->insn_bits(dev, s, &new_insn, new_data); |
169 | if (ret < 0) | |
170 | return ret; | |
ed9eccbe | 171 | |
01fca378 HS |
172 | if (insn->insn == INSN_READ) |
173 | data[0] = (new_data[1] >> (chan - base_bitfield_channel)) & 1; | |
174 | ||
175 | return 1; | |
ed9eccbe DS |
176 | } |
177 | ||
40f58a65 HS |
178 | static int __comedi_device_postconfig_async(struct comedi_device *dev, |
179 | struct comedi_subdevice *s) | |
180 | { | |
181 | struct comedi_async *async; | |
182 | unsigned int buf_size; | |
183 | int ret; | |
184 | ||
57b71c3e HS |
185 | if ((s->subdev_flags & (SDF_CMD_READ | SDF_CMD_WRITE)) == 0) { |
186 | dev_warn(dev->class_dev, | |
187 | "async subdevices must support SDF_CMD_READ or SDF_CMD_WRITE\n"); | |
188 | return -EINVAL; | |
189 | } | |
190 | if (!s->do_cmdtest) { | |
191 | dev_warn(dev->class_dev, | |
192 | "async subdevices must have a do_cmdtest() function\n"); | |
193 | return -EINVAL; | |
194 | } | |
40f58a65 HS |
195 | |
196 | async = kzalloc(sizeof(*async), GFP_KERNEL); | |
78110bb8 | 197 | if (!async) |
40f58a65 | 198 | return -ENOMEM; |
78110bb8 | 199 | |
40f58a65 HS |
200 | init_waitqueue_head(&async->wait_head); |
201 | async->subdevice = s; | |
202 | s->async = async; | |
203 | ||
204 | async->max_bufsize = comedi_default_buf_maxsize_kb * 1024; | |
205 | buf_size = comedi_default_buf_size_kb * 1024; | |
206 | if (buf_size > async->max_bufsize) | |
207 | buf_size = async->max_bufsize; | |
208 | ||
209 | if (comedi_buf_alloc(dev, s, buf_size) < 0) { | |
210 | dev_warn(dev->class_dev, "Buffer allocation failed\n"); | |
211 | return -ENOMEM; | |
212 | } | |
213 | if (s->buf_change) { | |
214 | ret = s->buf_change(dev, s, buf_size); | |
215 | if (ret < 0) | |
216 | return ret; | |
217 | } | |
218 | ||
f65cc544 | 219 | comedi_alloc_subdevice_minor(s); |
40f58a65 HS |
220 | |
221 | return 0; | |
222 | } | |
223 | ||
224 | static int __comedi_device_postconfig(struct comedi_device *dev) | |
ed9eccbe | 225 | { |
34c43922 | 226 | struct comedi_subdevice *s; |
ed9eccbe | 227 | int ret; |
40f58a65 | 228 | int i; |
ed9eccbe DS |
229 | |
230 | for (i = 0; i < dev->n_subdevices; i++) { | |
5e4c58ce | 231 | s = &dev->subdevices[i]; |
ed9eccbe DS |
232 | |
233 | if (s->type == COMEDI_SUBD_UNUSED) | |
234 | continue; | |
235 | ||
236 | if (s->len_chanlist == 0) | |
237 | s->len_chanlist = 1; | |
238 | ||
239 | if (s->do_cmd) { | |
40f58a65 HS |
240 | ret = __comedi_device_postconfig_async(dev, s); |
241 | if (ret) | |
242 | return ret; | |
ed9eccbe DS |
243 | } |
244 | ||
245 | if (!s->range_table && !s->range_table_list) | |
246 | s->range_table = &range_unknown; | |
247 | ||
248 | if (!s->insn_read && s->insn_bits) | |
249 | s->insn_read = insn_rw_emulate_bits; | |
250 | if (!s->insn_write && s->insn_bits) | |
251 | s->insn_write = insn_rw_emulate_bits; | |
252 | ||
253 | if (!s->insn_read) | |
254 | s->insn_read = insn_inval; | |
255 | if (!s->insn_write) | |
256 | s->insn_write = insn_inval; | |
257 | if (!s->insn_bits) | |
258 | s->insn_bits = insn_inval; | |
259 | if (!s->insn_config) | |
260 | s->insn_config = insn_inval; | |
261 | ||
262 | if (!s->poll) | |
263 | s->poll = poll_invalid; | |
264 | } | |
265 | ||
266 | return 0; | |
267 | } | |
268 | ||
01fca378 | 269 | /* do a little post-config cleanup */ |
01fca378 HS |
270 | static int comedi_device_postconfig(struct comedi_device *dev) |
271 | { | |
b2a644b4 IA |
272 | int ret; |
273 | ||
274 | ret = __comedi_device_postconfig(dev); | |
ae5dd5fc | 275 | if (ret < 0) |
01fca378 | 276 | return ret; |
01fca378 | 277 | smp_wmb(); |
a7401cdd | 278 | dev->attached = true; |
01fca378 HS |
279 | return 0; |
280 | } | |
281 | ||
4e2f002f IA |
282 | /* |
283 | * Generic recognize function for drivers that register their supported | |
284 | * board names. | |
285 | * | |
286 | * 'driv->board_name' points to a 'const char *' member within the | |
287 | * zeroth element of an array of some private board information | |
288 | * structure, say 'struct foo_board' containing a member 'const char | |
289 | * *board_name' that is initialized to point to a board name string that | |
290 | * is one of the candidates matched against this function's 'name' | |
291 | * parameter. | |
292 | * | |
293 | * 'driv->offset' is the size of the private board information | |
294 | * structure, say 'sizeof(struct foo_board)', and 'driv->num_names' is | |
295 | * the length of the array of private board information structures. | |
296 | * | |
297 | * If one of the board names in the array of private board information | |
298 | * structures matches the name supplied to this function, the function | |
299 | * returns a pointer to the pointer to the board name, otherwise it | |
300 | * returns NULL. The return value ends up in the 'board_ptr' member of | |
301 | * a 'struct comedi_device' that the low-level comedi driver's | |
302 | * 'attach()' hook can convert to a point to a particular element of its | |
303 | * array of private board information structures by subtracting the | |
304 | * offset of the member that points to the board name. (No subtraction | |
305 | * is required if the board name pointer is the first member of the | |
306 | * private board information structure, which is generally the case.) | |
307 | */ | |
7029a874 | 308 | static void *comedi_recognize(struct comedi_driver *driv, const char *name) |
ed9eccbe | 309 | { |
1c9de58a DC |
310 | char **name_ptr = (char **)driv->board_name; |
311 | int i; | |
312 | ||
ed9eccbe DS |
313 | for (i = 0; i < driv->num_names; i++) { |
314 | if (strcmp(*name_ptr, name) == 0) | |
1c9de58a DC |
315 | return name_ptr; |
316 | name_ptr = (void *)name_ptr + driv->offset; | |
ed9eccbe DS |
317 | } |
318 | ||
319 | return NULL; | |
320 | } | |
321 | ||
7029a874 | 322 | static void comedi_report_boards(struct comedi_driver *driv) |
ed9eccbe DS |
323 | { |
324 | unsigned int i; | |
325 | const char *const *name_ptr; | |
326 | ||
4f870fe6 IA |
327 | pr_info("comedi: valid board names for %s driver are:\n", |
328 | driv->driver_name); | |
ed9eccbe DS |
329 | |
330 | name_ptr = driv->board_name; | |
331 | for (i = 0; i < driv->num_names; i++) { | |
4f870fe6 | 332 | pr_info(" %s\n", *name_ptr); |
ed9eccbe DS |
333 | name_ptr = (const char **)((char *)name_ptr + driv->offset); |
334 | } | |
335 | ||
336 | if (driv->num_names == 0) | |
4f870fe6 | 337 | pr_info(" %s\n", driv->driver_name); |
ed9eccbe DS |
338 | } |
339 | ||
9ff8b151 HS |
340 | /** |
341 | * comedi_load_firmware() - Request and load firmware for a device. | |
342 | * @dev: comedi_device struct | |
343 | * @hw_device: device struct for the comedi_device | |
344 | * @name: the name of the firmware image | |
345 | * @cb: callback to the upload the firmware image | |
d569541e | 346 | * @context: private context from the driver |
9ff8b151 HS |
347 | */ |
348 | int comedi_load_firmware(struct comedi_device *dev, | |
349 | struct device *device, | |
350 | const char *name, | |
351 | int (*cb)(struct comedi_device *dev, | |
d569541e HS |
352 | const u8 *data, size_t size, |
353 | unsigned long context), | |
354 | unsigned long context) | |
9ff8b151 HS |
355 | { |
356 | const struct firmware *fw; | |
357 | int ret; | |
358 | ||
359 | if (!cb) | |
360 | return -EINVAL; | |
361 | ||
362 | ret = request_firmware(&fw, name, device); | |
363 | if (ret == 0) { | |
d569541e | 364 | ret = cb(dev, fw->data, fw->size, context); |
9ff8b151 HS |
365 | release_firmware(fw); |
366 | } | |
367 | ||
368 | return ret; | |
369 | } | |
370 | EXPORT_SYMBOL_GPL(comedi_load_firmware); | |
371 | ||
f375ac5f | 372 | /** |
ca8b2964 | 373 | * __comedi_request_region() - Request an I/O reqion for a legacy driver. |
f375ac5f HS |
374 | * @dev: comedi_device struct |
375 | * @start: base address of the I/O reqion | |
376 | * @len: length of the I/O region | |
377 | */ | |
ca8b2964 HS |
378 | int __comedi_request_region(struct comedi_device *dev, |
379 | unsigned long start, unsigned long len) | |
f375ac5f HS |
380 | { |
381 | if (!start) { | |
382 | dev_warn(dev->class_dev, | |
383 | "%s: a I/O base address must be specified\n", | |
384 | dev->board_name); | |
385 | return -EINVAL; | |
386 | } | |
387 | ||
388 | if (!request_region(start, len, dev->board_name)) { | |
389 | dev_warn(dev->class_dev, "%s: I/O port conflict (%#lx,%lu)\n", | |
390 | dev->board_name, start, len); | |
391 | return -EIO; | |
392 | } | |
f375ac5f HS |
393 | |
394 | return 0; | |
395 | } | |
ca8b2964 HS |
396 | EXPORT_SYMBOL_GPL(__comedi_request_region); |
397 | ||
398 | /** | |
399 | * comedi_request_region() - Request an I/O reqion for a legacy driver. | |
400 | * @dev: comedi_device struct | |
401 | * @start: base address of the I/O reqion | |
402 | * @len: length of the I/O region | |
403 | */ | |
404 | int comedi_request_region(struct comedi_device *dev, | |
405 | unsigned long start, unsigned long len) | |
406 | { | |
407 | int ret; | |
408 | ||
409 | ret = __comedi_request_region(dev, start, len); | |
316f97f1 | 410 | if (ret == 0) { |
ca8b2964 | 411 | dev->iobase = start; |
316f97f1 HS |
412 | dev->iolen = len; |
413 | } | |
ca8b2964 HS |
414 | |
415 | return ret; | |
416 | } | |
f375ac5f HS |
417 | EXPORT_SYMBOL_GPL(comedi_request_region); |
418 | ||
316f97f1 HS |
419 | /** |
420 | * comedi_legacy_detach() - A generic (*detach) function for legacy drivers. | |
421 | * @dev: comedi_device struct | |
422 | */ | |
423 | void comedi_legacy_detach(struct comedi_device *dev) | |
424 | { | |
3d1fe3f7 HS |
425 | if (dev->irq) { |
426 | free_irq(dev->irq, dev); | |
427 | dev->irq = 0; | |
428 | } | |
316f97f1 HS |
429 | if (dev->iobase && dev->iolen) { |
430 | release_region(dev->iobase, dev->iolen); | |
431 | dev->iobase = 0; | |
432 | dev->iolen = 0; | |
433 | } | |
434 | } | |
435 | EXPORT_SYMBOL_GPL(comedi_legacy_detach); | |
436 | ||
01fca378 | 437 | int comedi_device_attach(struct comedi_device *dev, struct comedi_devconfig *it) |
ed9eccbe | 438 | { |
01fca378 HS |
439 | struct comedi_driver *driv; |
440 | int ret; | |
441 | ||
442 | if (dev->attached) | |
443 | return -EBUSY; | |
444 | ||
445 | for (driv = comedi_drivers; driv; driv = driv->next) { | |
446 | if (!try_module_get(driv->module)) | |
447 | continue; | |
448 | if (driv->num_names) { | |
449 | dev->board_ptr = comedi_recognize(driv, it->board_name); | |
450 | if (dev->board_ptr) | |
451 | break; | |
452 | } else if (strcmp(driv->driver_name, it->board_name) == 0) | |
453 | break; | |
454 | module_put(driv->module); | |
455 | } | |
456 | if (driv == NULL) { | |
457 | /* recognize has failed if we get here */ | |
458 | /* report valid board names before returning error */ | |
459 | for (driv = comedi_drivers; driv; driv = driv->next) { | |
460 | if (!try_module_get(driv->module)) | |
461 | continue; | |
462 | comedi_report_boards(driv); | |
463 | module_put(driv->module); | |
464 | } | |
465 | return -EIO; | |
466 | } | |
467 | if (driv->attach == NULL) { | |
468 | /* driver does not support manual configuration */ | |
469 | dev_warn(dev->class_dev, | |
470 | "driver '%s' does not support attach using comedi_config\n", | |
471 | driv->driver_name); | |
472 | module_put(driv->module); | |
473 | return -ENOSYS; | |
474 | } | |
475 | /* initialize dev->driver here so | |
476 | * comedi_error() can be called from attach */ | |
477 | dev->driver = driv; | |
34b68400 HS |
478 | dev->board_name = dev->board_ptr ? *(const char **)dev->board_ptr |
479 | : dev->driver->driver_name; | |
01fca378 | 480 | ret = driv->attach(dev, it); |
74ece108 IA |
481 | if (ret >= 0) |
482 | ret = comedi_device_postconfig(dev); | |
01fca378 | 483 | if (ret < 0) { |
016599f5 | 484 | comedi_device_detach(dev); |
dcd7b8bd | 485 | module_put(dev->driver->module); |
01fca378 | 486 | } |
b2a644b4 IA |
487 | /* On success, the driver module count has been incremented. */ |
488 | return ret; | |
ed9eccbe DS |
489 | } |
490 | ||
a588da1d IA |
491 | int comedi_auto_config(struct device *hardware_device, |
492 | struct comedi_driver *driver, unsigned long context) | |
f4011670 | 493 | { |
6013a9a5 | 494 | struct comedi_device *dev; |
f4011670 IA |
495 | int ret; |
496 | ||
f08e0ac5 IA |
497 | if (!hardware_device) { |
498 | pr_warn("BUG! comedi_auto_config called with NULL hardware_device\n"); | |
499 | return -EINVAL; | |
500 | } | |
501 | if (!driver) { | |
502 | dev_warn(hardware_device, | |
503 | "BUG! comedi_auto_config called with NULL comedi driver\n"); | |
504 | return -EINVAL; | |
505 | } | |
506 | ||
a588da1d IA |
507 | if (!driver->auto_attach) { |
508 | dev_warn(hardware_device, | |
509 | "BUG! comedi driver '%s' has no auto_attach handler\n", | |
510 | driver->driver_name); | |
511 | return -EINVAL; | |
512 | } | |
513 | ||
6013a9a5 HS |
514 | dev = comedi_alloc_board_minor(hardware_device); |
515 | if (IS_ERR(dev)) | |
516 | return PTR_ERR(dev); | |
517 | /* Note: comedi_alloc_board_minor() locked dev->mutex. */ | |
f4011670 | 518 | |
6013a9a5 | 519 | dev->driver = driver; |
34b68400 | 520 | dev->board_name = dev->driver->driver_name; |
6013a9a5 | 521 | ret = driver->auto_attach(dev, context); |
74ece108 | 522 | if (ret >= 0) |
6013a9a5 | 523 | ret = comedi_device_postconfig(dev); |
b2a644b4 | 524 | if (ret < 0) |
6013a9a5 HS |
525 | comedi_device_detach(dev); |
526 | mutex_unlock(&dev->mutex); | |
f4011670 IA |
527 | |
528 | if (ret < 0) | |
f5b31e15 | 529 | comedi_release_hardware_device(hardware_device); |
f4011670 IA |
530 | return ret; |
531 | } | |
8ed705af IA |
532 | EXPORT_SYMBOL_GPL(comedi_auto_config); |
533 | ||
534 | void comedi_auto_unconfig(struct device *hardware_device) | |
ed9eccbe | 535 | { |
c43435d7 IA |
536 | if (hardware_device == NULL) |
537 | return; | |
3346b798 | 538 | comedi_release_hardware_device(hardware_device); |
ed9eccbe | 539 | } |
8ed705af | 540 | EXPORT_SYMBOL_GPL(comedi_auto_unconfig); |
1ae6b20b HS |
541 | |
542 | int comedi_driver_register(struct comedi_driver *driver) | |
543 | { | |
544 | driver->next = comedi_drivers; | |
545 | comedi_drivers = driver; | |
546 | ||
547 | return 0; | |
548 | } | |
5660e742 | 549 | EXPORT_SYMBOL_GPL(comedi_driver_register); |
1ae6b20b HS |
550 | |
551 | int comedi_driver_unregister(struct comedi_driver *driver) | |
552 | { | |
553 | struct comedi_driver *prev; | |
554 | int i; | |
555 | ||
556 | /* check for devices using this driver */ | |
557 | for (i = 0; i < COMEDI_NUM_BOARD_MINORS; i++) { | |
558 | struct comedi_device *dev = comedi_dev_from_minor(i); | |
559 | ||
560 | if (!dev) | |
561 | continue; | |
562 | ||
563 | mutex_lock(&dev->mutex); | |
564 | if (dev->attached && dev->driver == driver) { | |
565 | if (dev->use_count) | |
566 | dev_warn(dev->class_dev, | |
567 | "BUG! detaching device with use_count=%d\n", | |
568 | dev->use_count); | |
569 | comedi_device_detach(dev); | |
570 | } | |
571 | mutex_unlock(&dev->mutex); | |
572 | } | |
573 | ||
574 | if (comedi_drivers == driver) { | |
575 | comedi_drivers = driver->next; | |
576 | return 0; | |
577 | } | |
578 | ||
579 | for (prev = comedi_drivers; prev->next; prev = prev->next) { | |
580 | if (prev->next == driver) { | |
581 | prev->next = driver->next; | |
582 | return 0; | |
583 | } | |
584 | } | |
585 | return -EINVAL; | |
586 | } | |
5660e742 | 587 | EXPORT_SYMBOL_GPL(comedi_driver_unregister); |