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Commit | Line | Data |
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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> | |
ed9eccbe DS |
26 | #include <linux/ioport.h> |
27 | #include <linux/mm.h> | |
28 | #include <linux/slab.h> | |
ed9eccbe DS |
29 | #include <linux/highmem.h> /* for SuSE brokenness */ |
30 | #include <linux/vmalloc.h> | |
31 | #include <linux/cdev.h> | |
32 | #include <linux/dma-mapping.h> | |
5617f9da | 33 | #include <linux/io.h> |
3d1fe3f7 | 34 | #include <linux/interrupt.h> |
9ff8b151 | 35 | #include <linux/firmware.h> |
ed9eccbe | 36 | |
242e7ad9 | 37 | #include "comedidev.h" |
3a5fa275 | 38 | #include "comedi_internal.h" |
242e7ad9 | 39 | |
139dfbdf | 40 | struct comedi_driver *comedi_drivers; |
ed9eccbe | 41 | |
da717511 IA |
42 | int comedi_set_hw_dev(struct comedi_device *dev, struct device *hw_dev) |
43 | { | |
de06d7c6 IA |
44 | if (hw_dev == dev->hw_dev) |
45 | return 0; | |
46 | if (dev->hw_dev != NULL) | |
47 | return -EEXIST; | |
da717511 | 48 | dev->hw_dev = get_device(hw_dev); |
da717511 IA |
49 | return 0; |
50 | } | |
51 | EXPORT_SYMBOL_GPL(comedi_set_hw_dev); | |
52 | ||
de06d7c6 IA |
53 | static void comedi_clear_hw_dev(struct comedi_device *dev) |
54 | { | |
55 | put_device(dev->hw_dev); | |
56 | dev->hw_dev = NULL; | |
57 | } | |
58 | ||
54db996e HS |
59 | /** |
60 | * comedi_alloc_devpriv() - Allocate memory for the device private data. | |
61 | * @dev: comedi_device struct | |
62 | * @size: size of the memory to allocate | |
63 | */ | |
64 | void *comedi_alloc_devpriv(struct comedi_device *dev, size_t size) | |
65 | { | |
66 | dev->private = kzalloc(size, GFP_KERNEL); | |
67 | return dev->private; | |
68 | } | |
69 | EXPORT_SYMBOL_GPL(comedi_alloc_devpriv); | |
70 | ||
8b9ba6e5 | 71 | int comedi_alloc_subdevices(struct comedi_device *dev, int num_subdevices) |
2f0b9d08 | 72 | { |
03afcf47 | 73 | struct comedi_subdevice *s; |
8b9ba6e5 | 74 | int i; |
2f0b9d08 | 75 | |
7f801c41 HS |
76 | if (num_subdevices < 1) |
77 | return -EINVAL; | |
03afcf47 HS |
78 | |
79 | s = kcalloc(num_subdevices, sizeof(*s), GFP_KERNEL); | |
80 | if (!s) | |
2f0b9d08 | 81 | return -ENOMEM; |
03afcf47 | 82 | dev->subdevices = s; |
fba1d0fa | 83 | dev->n_subdevices = num_subdevices; |
03afcf47 | 84 | |
2f0b9d08 | 85 | for (i = 0; i < num_subdevices; ++i) { |
5e4c58ce | 86 | s = &dev->subdevices[i]; |
03afcf47 | 87 | s->device = dev; |
90a35c15 | 88 | s->index = i; |
03afcf47 HS |
89 | s->async_dma_dir = DMA_NONE; |
90 | spin_lock_init(&s->spin_lock); | |
91 | s->minor = -1; | |
2f0b9d08 HS |
92 | } |
93 | return 0; | |
94 | } | |
95 | EXPORT_SYMBOL_GPL(comedi_alloc_subdevices); | |
96 | ||
71b5f4f1 | 97 | static void cleanup_device(struct comedi_device *dev) |
ed9eccbe DS |
98 | { |
99 | int i; | |
34c43922 | 100 | struct comedi_subdevice *s; |
ed9eccbe DS |
101 | |
102 | if (dev->subdevices) { | |
103 | for (i = 0; i < dev->n_subdevices; i++) { | |
5e4c58ce | 104 | s = &dev->subdevices[i]; |
588ba6dc HS |
105 | if (s->runflags & SRF_FREE_SPRIV) |
106 | kfree(s->private); | |
ed9eccbe DS |
107 | comedi_free_subdevice_minor(s); |
108 | if (s->async) { | |
109 | comedi_buf_alloc(dev, s, 0); | |
110 | kfree(s->async); | |
111 | } | |
112 | } | |
113 | kfree(dev->subdevices); | |
114 | dev->subdevices = NULL; | |
115 | dev->n_subdevices = 0; | |
116 | } | |
dedd1325 BP |
117 | kfree(dev->private); |
118 | dev->private = NULL; | |
7029a874 | 119 | dev->driver = NULL; |
ed9eccbe DS |
120 | dev->board_name = NULL; |
121 | dev->board_ptr = NULL; | |
122 | dev->iobase = 0; | |
316f97f1 | 123 | dev->iolen = 0; |
00ca6884 | 124 | dev->ioenabled = false; |
ed9eccbe DS |
125 | dev->irq = 0; |
126 | dev->read_subdev = NULL; | |
127 | dev->write_subdev = NULL; | |
128 | dev->open = NULL; | |
129 | dev->close = NULL; | |
de06d7c6 | 130 | comedi_clear_hw_dev(dev); |
ed9eccbe DS |
131 | } |
132 | ||
016599f5 | 133 | void comedi_device_detach(struct comedi_device *dev) |
ed9eccbe | 134 | { |
a7401cdd | 135 | dev->attached = false; |
5617f9da | 136 | if (dev->driver) |
ed9eccbe | 137 | dev->driver->detach(dev); |
ed9eccbe DS |
138 | cleanup_device(dev); |
139 | } | |
140 | ||
01fca378 | 141 | static int poll_invalid(struct comedi_device *dev, struct comedi_subdevice *s) |
ed9eccbe | 142 | { |
01fca378 | 143 | return -EINVAL; |
ed9eccbe DS |
144 | } |
145 | ||
01fca378 HS |
146 | int insn_inval(struct comedi_device *dev, struct comedi_subdevice *s, |
147 | struct comedi_insn *insn, unsigned int *data) | |
ed9eccbe | 148 | { |
01fca378 | 149 | return -EINVAL; |
ed9eccbe DS |
150 | } |
151 | ||
01fca378 HS |
152 | static int insn_rw_emulate_bits(struct comedi_device *dev, |
153 | struct comedi_subdevice *s, | |
154 | struct comedi_insn *insn, unsigned int *data) | |
ed9eccbe | 155 | { |
01fca378 HS |
156 | struct comedi_insn new_insn; |
157 | int ret; | |
158 | static const unsigned channels_per_bitfield = 32; | |
ed9eccbe | 159 | |
01fca378 HS |
160 | unsigned chan = CR_CHAN(insn->chanspec); |
161 | const unsigned base_bitfield_channel = | |
162 | (chan < channels_per_bitfield) ? 0 : chan; | |
163 | unsigned int new_data[2]; | |
164 | memset(new_data, 0, sizeof(new_data)); | |
165 | memset(&new_insn, 0, sizeof(new_insn)); | |
166 | new_insn.insn = INSN_BITS; | |
167 | new_insn.chanspec = base_bitfield_channel; | |
168 | new_insn.n = 2; | |
169 | new_insn.subdev = insn->subdev; | |
ed9eccbe | 170 | |
01fca378 HS |
171 | if (insn->insn == INSN_WRITE) { |
172 | if (!(s->subdev_flags & SDF_WRITABLE)) | |
173 | return -EINVAL; | |
174 | new_data[0] = 1 << (chan - base_bitfield_channel); /* mask */ | |
175 | new_data[1] = data[0] ? (1 << (chan - base_bitfield_channel)) | |
176 | : 0; /* bits */ | |
ed9eccbe DS |
177 | } |
178 | ||
01fca378 HS |
179 | ret = s->insn_bits(dev, s, &new_insn, new_data); |
180 | if (ret < 0) | |
181 | return ret; | |
ed9eccbe | 182 | |
01fca378 HS |
183 | if (insn->insn == INSN_READ) |
184 | data[0] = (new_data[1] >> (chan - base_bitfield_channel)) & 1; | |
185 | ||
186 | return 1; | |
ed9eccbe DS |
187 | } |
188 | ||
40f58a65 HS |
189 | static int __comedi_device_postconfig_async(struct comedi_device *dev, |
190 | struct comedi_subdevice *s) | |
191 | { | |
192 | struct comedi_async *async; | |
193 | unsigned int buf_size; | |
194 | int ret; | |
195 | ||
57b71c3e HS |
196 | if ((s->subdev_flags & (SDF_CMD_READ | SDF_CMD_WRITE)) == 0) { |
197 | dev_warn(dev->class_dev, | |
198 | "async subdevices must support SDF_CMD_READ or SDF_CMD_WRITE\n"); | |
199 | return -EINVAL; | |
200 | } | |
201 | if (!s->do_cmdtest) { | |
202 | dev_warn(dev->class_dev, | |
203 | "async subdevices must have a do_cmdtest() function\n"); | |
204 | return -EINVAL; | |
205 | } | |
40f58a65 HS |
206 | |
207 | async = kzalloc(sizeof(*async), GFP_KERNEL); | |
78110bb8 | 208 | if (!async) |
40f58a65 | 209 | return -ENOMEM; |
78110bb8 | 210 | |
40f58a65 HS |
211 | init_waitqueue_head(&async->wait_head); |
212 | async->subdevice = s; | |
213 | s->async = async; | |
214 | ||
215 | async->max_bufsize = comedi_default_buf_maxsize_kb * 1024; | |
216 | buf_size = comedi_default_buf_size_kb * 1024; | |
217 | if (buf_size > async->max_bufsize) | |
218 | buf_size = async->max_bufsize; | |
219 | ||
220 | if (comedi_buf_alloc(dev, s, buf_size) < 0) { | |
221 | dev_warn(dev->class_dev, "Buffer allocation failed\n"); | |
222 | return -ENOMEM; | |
223 | } | |
224 | if (s->buf_change) { | |
225 | ret = s->buf_change(dev, s, buf_size); | |
226 | if (ret < 0) | |
227 | return ret; | |
228 | } | |
229 | ||
f65cc544 | 230 | comedi_alloc_subdevice_minor(s); |
40f58a65 HS |
231 | |
232 | return 0; | |
233 | } | |
234 | ||
235 | static int __comedi_device_postconfig(struct comedi_device *dev) | |
ed9eccbe | 236 | { |
34c43922 | 237 | struct comedi_subdevice *s; |
ed9eccbe | 238 | int ret; |
40f58a65 | 239 | int i; |
ed9eccbe DS |
240 | |
241 | for (i = 0; i < dev->n_subdevices; i++) { | |
5e4c58ce | 242 | s = &dev->subdevices[i]; |
ed9eccbe DS |
243 | |
244 | if (s->type == COMEDI_SUBD_UNUSED) | |
245 | continue; | |
246 | ||
247 | if (s->len_chanlist == 0) | |
248 | s->len_chanlist = 1; | |
249 | ||
250 | if (s->do_cmd) { | |
40f58a65 HS |
251 | ret = __comedi_device_postconfig_async(dev, s); |
252 | if (ret) | |
253 | return ret; | |
ed9eccbe DS |
254 | } |
255 | ||
256 | if (!s->range_table && !s->range_table_list) | |
257 | s->range_table = &range_unknown; | |
258 | ||
259 | if (!s->insn_read && s->insn_bits) | |
260 | s->insn_read = insn_rw_emulate_bits; | |
261 | if (!s->insn_write && s->insn_bits) | |
262 | s->insn_write = insn_rw_emulate_bits; | |
263 | ||
264 | if (!s->insn_read) | |
265 | s->insn_read = insn_inval; | |
266 | if (!s->insn_write) | |
267 | s->insn_write = insn_inval; | |
268 | if (!s->insn_bits) | |
269 | s->insn_bits = insn_inval; | |
270 | if (!s->insn_config) | |
271 | s->insn_config = insn_inval; | |
272 | ||
273 | if (!s->poll) | |
274 | s->poll = poll_invalid; | |
275 | } | |
276 | ||
277 | return 0; | |
278 | } | |
279 | ||
01fca378 | 280 | /* do a little post-config cleanup */ |
01fca378 HS |
281 | static int comedi_device_postconfig(struct comedi_device *dev) |
282 | { | |
b2a644b4 IA |
283 | int ret; |
284 | ||
285 | ret = __comedi_device_postconfig(dev); | |
ae5dd5fc | 286 | if (ret < 0) |
01fca378 | 287 | return ret; |
01fca378 | 288 | smp_wmb(); |
a7401cdd | 289 | dev->attached = true; |
01fca378 HS |
290 | return 0; |
291 | } | |
292 | ||
4e2f002f IA |
293 | /* |
294 | * Generic recognize function for drivers that register their supported | |
295 | * board names. | |
296 | * | |
297 | * 'driv->board_name' points to a 'const char *' member within the | |
298 | * zeroth element of an array of some private board information | |
299 | * structure, say 'struct foo_board' containing a member 'const char | |
300 | * *board_name' that is initialized to point to a board name string that | |
301 | * is one of the candidates matched against this function's 'name' | |
302 | * parameter. | |
303 | * | |
304 | * 'driv->offset' is the size of the private board information | |
305 | * structure, say 'sizeof(struct foo_board)', and 'driv->num_names' is | |
306 | * the length of the array of private board information structures. | |
307 | * | |
308 | * If one of the board names in the array of private board information | |
309 | * structures matches the name supplied to this function, the function | |
310 | * returns a pointer to the pointer to the board name, otherwise it | |
311 | * returns NULL. The return value ends up in the 'board_ptr' member of | |
312 | * a 'struct comedi_device' that the low-level comedi driver's | |
313 | * 'attach()' hook can convert to a point to a particular element of its | |
314 | * array of private board information structures by subtracting the | |
315 | * offset of the member that points to the board name. (No subtraction | |
316 | * is required if the board name pointer is the first member of the | |
317 | * private board information structure, which is generally the case.) | |
318 | */ | |
7029a874 | 319 | static void *comedi_recognize(struct comedi_driver *driv, const char *name) |
ed9eccbe | 320 | { |
1c9de58a DC |
321 | char **name_ptr = (char **)driv->board_name; |
322 | int i; | |
323 | ||
ed9eccbe DS |
324 | for (i = 0; i < driv->num_names; i++) { |
325 | if (strcmp(*name_ptr, name) == 0) | |
1c9de58a DC |
326 | return name_ptr; |
327 | name_ptr = (void *)name_ptr + driv->offset; | |
ed9eccbe DS |
328 | } |
329 | ||
330 | return NULL; | |
331 | } | |
332 | ||
7029a874 | 333 | static void comedi_report_boards(struct comedi_driver *driv) |
ed9eccbe DS |
334 | { |
335 | unsigned int i; | |
336 | const char *const *name_ptr; | |
337 | ||
4f870fe6 IA |
338 | pr_info("comedi: valid board names for %s driver are:\n", |
339 | driv->driver_name); | |
ed9eccbe DS |
340 | |
341 | name_ptr = driv->board_name; | |
342 | for (i = 0; i < driv->num_names; i++) { | |
4f870fe6 | 343 | pr_info(" %s\n", *name_ptr); |
ed9eccbe DS |
344 | name_ptr = (const char **)((char *)name_ptr + driv->offset); |
345 | } | |
346 | ||
347 | if (driv->num_names == 0) | |
4f870fe6 | 348 | pr_info(" %s\n", driv->driver_name); |
ed9eccbe DS |
349 | } |
350 | ||
9ff8b151 HS |
351 | /** |
352 | * comedi_load_firmware() - Request and load firmware for a device. | |
353 | * @dev: comedi_device struct | |
354 | * @hw_device: device struct for the comedi_device | |
355 | * @name: the name of the firmware image | |
356 | * @cb: callback to the upload the firmware image | |
d569541e | 357 | * @context: private context from the driver |
9ff8b151 HS |
358 | */ |
359 | int comedi_load_firmware(struct comedi_device *dev, | |
360 | struct device *device, | |
361 | const char *name, | |
362 | int (*cb)(struct comedi_device *dev, | |
d569541e HS |
363 | const u8 *data, size_t size, |
364 | unsigned long context), | |
365 | unsigned long context) | |
9ff8b151 HS |
366 | { |
367 | const struct firmware *fw; | |
368 | int ret; | |
369 | ||
370 | if (!cb) | |
371 | return -EINVAL; | |
372 | ||
373 | ret = request_firmware(&fw, name, device); | |
374 | if (ret == 0) { | |
d569541e | 375 | ret = cb(dev, fw->data, fw->size, context); |
9ff8b151 HS |
376 | release_firmware(fw); |
377 | } | |
378 | ||
379 | return ret; | |
380 | } | |
381 | EXPORT_SYMBOL_GPL(comedi_load_firmware); | |
382 | ||
f375ac5f | 383 | /** |
ca8b2964 | 384 | * __comedi_request_region() - Request an I/O reqion for a legacy driver. |
f375ac5f HS |
385 | * @dev: comedi_device struct |
386 | * @start: base address of the I/O reqion | |
387 | * @len: length of the I/O region | |
388 | */ | |
ca8b2964 HS |
389 | int __comedi_request_region(struct comedi_device *dev, |
390 | unsigned long start, unsigned long len) | |
f375ac5f HS |
391 | { |
392 | if (!start) { | |
393 | dev_warn(dev->class_dev, | |
394 | "%s: a I/O base address must be specified\n", | |
395 | dev->board_name); | |
396 | return -EINVAL; | |
397 | } | |
398 | ||
399 | if (!request_region(start, len, dev->board_name)) { | |
400 | dev_warn(dev->class_dev, "%s: I/O port conflict (%#lx,%lu)\n", | |
401 | dev->board_name, start, len); | |
402 | return -EIO; | |
403 | } | |
f375ac5f HS |
404 | |
405 | return 0; | |
406 | } | |
ca8b2964 HS |
407 | EXPORT_SYMBOL_GPL(__comedi_request_region); |
408 | ||
409 | /** | |
410 | * comedi_request_region() - Request an I/O reqion for a legacy driver. | |
411 | * @dev: comedi_device struct | |
412 | * @start: base address of the I/O reqion | |
413 | * @len: length of the I/O region | |
414 | */ | |
415 | int comedi_request_region(struct comedi_device *dev, | |
416 | unsigned long start, unsigned long len) | |
417 | { | |
418 | int ret; | |
419 | ||
420 | ret = __comedi_request_region(dev, start, len); | |
316f97f1 | 421 | if (ret == 0) { |
ca8b2964 | 422 | dev->iobase = start; |
316f97f1 HS |
423 | dev->iolen = len; |
424 | } | |
ca8b2964 HS |
425 | |
426 | return ret; | |
427 | } | |
f375ac5f HS |
428 | EXPORT_SYMBOL_GPL(comedi_request_region); |
429 | ||
316f97f1 HS |
430 | /** |
431 | * comedi_legacy_detach() - A generic (*detach) function for legacy drivers. | |
432 | * @dev: comedi_device struct | |
433 | */ | |
434 | void comedi_legacy_detach(struct comedi_device *dev) | |
435 | { | |
3d1fe3f7 HS |
436 | if (dev->irq) { |
437 | free_irq(dev->irq, dev); | |
438 | dev->irq = 0; | |
439 | } | |
316f97f1 HS |
440 | if (dev->iobase && dev->iolen) { |
441 | release_region(dev->iobase, dev->iolen); | |
442 | dev->iobase = 0; | |
443 | dev->iolen = 0; | |
444 | } | |
445 | } | |
446 | EXPORT_SYMBOL_GPL(comedi_legacy_detach); | |
447 | ||
01fca378 | 448 | int comedi_device_attach(struct comedi_device *dev, struct comedi_devconfig *it) |
ed9eccbe | 449 | { |
01fca378 HS |
450 | struct comedi_driver *driv; |
451 | int ret; | |
452 | ||
453 | if (dev->attached) | |
454 | return -EBUSY; | |
455 | ||
456 | for (driv = comedi_drivers; driv; driv = driv->next) { | |
457 | if (!try_module_get(driv->module)) | |
458 | continue; | |
459 | if (driv->num_names) { | |
460 | dev->board_ptr = comedi_recognize(driv, it->board_name); | |
461 | if (dev->board_ptr) | |
462 | break; | |
463 | } else if (strcmp(driv->driver_name, it->board_name) == 0) | |
464 | break; | |
465 | module_put(driv->module); | |
466 | } | |
467 | if (driv == NULL) { | |
468 | /* recognize has failed if we get here */ | |
469 | /* report valid board names before returning error */ | |
470 | for (driv = comedi_drivers; driv; driv = driv->next) { | |
471 | if (!try_module_get(driv->module)) | |
472 | continue; | |
473 | comedi_report_boards(driv); | |
474 | module_put(driv->module); | |
475 | } | |
476 | return -EIO; | |
477 | } | |
478 | if (driv->attach == NULL) { | |
479 | /* driver does not support manual configuration */ | |
480 | dev_warn(dev->class_dev, | |
481 | "driver '%s' does not support attach using comedi_config\n", | |
482 | driv->driver_name); | |
483 | module_put(driv->module); | |
484 | return -ENOSYS; | |
485 | } | |
486 | /* initialize dev->driver here so | |
487 | * comedi_error() can be called from attach */ | |
488 | dev->driver = driv; | |
34b68400 HS |
489 | dev->board_name = dev->board_ptr ? *(const char **)dev->board_ptr |
490 | : dev->driver->driver_name; | |
01fca378 | 491 | ret = driv->attach(dev, it); |
74ece108 IA |
492 | if (ret >= 0) |
493 | ret = comedi_device_postconfig(dev); | |
01fca378 | 494 | if (ret < 0) { |
016599f5 | 495 | comedi_device_detach(dev); |
dcd7b8bd | 496 | module_put(dev->driver->module); |
01fca378 | 497 | } |
b2a644b4 IA |
498 | /* On success, the driver module count has been incremented. */ |
499 | return ret; | |
ed9eccbe DS |
500 | } |
501 | ||
a588da1d IA |
502 | int comedi_auto_config(struct device *hardware_device, |
503 | struct comedi_driver *driver, unsigned long context) | |
f4011670 | 504 | { |
6013a9a5 | 505 | struct comedi_device *dev; |
f4011670 IA |
506 | int ret; |
507 | ||
f08e0ac5 IA |
508 | if (!hardware_device) { |
509 | pr_warn("BUG! comedi_auto_config called with NULL hardware_device\n"); | |
510 | return -EINVAL; | |
511 | } | |
512 | if (!driver) { | |
513 | dev_warn(hardware_device, | |
514 | "BUG! comedi_auto_config called with NULL comedi driver\n"); | |
515 | return -EINVAL; | |
516 | } | |
517 | ||
a588da1d IA |
518 | if (!driver->auto_attach) { |
519 | dev_warn(hardware_device, | |
520 | "BUG! comedi driver '%s' has no auto_attach handler\n", | |
521 | driver->driver_name); | |
522 | return -EINVAL; | |
523 | } | |
524 | ||
6013a9a5 HS |
525 | dev = comedi_alloc_board_minor(hardware_device); |
526 | if (IS_ERR(dev)) | |
527 | return PTR_ERR(dev); | |
528 | /* Note: comedi_alloc_board_minor() locked dev->mutex. */ | |
f4011670 | 529 | |
6013a9a5 | 530 | dev->driver = driver; |
34b68400 | 531 | dev->board_name = dev->driver->driver_name; |
6013a9a5 | 532 | ret = driver->auto_attach(dev, context); |
74ece108 | 533 | if (ret >= 0) |
6013a9a5 | 534 | ret = comedi_device_postconfig(dev); |
b2a644b4 | 535 | if (ret < 0) |
6013a9a5 HS |
536 | comedi_device_detach(dev); |
537 | mutex_unlock(&dev->mutex); | |
f4011670 IA |
538 | |
539 | if (ret < 0) | |
f5b31e15 | 540 | comedi_release_hardware_device(hardware_device); |
f4011670 IA |
541 | return ret; |
542 | } | |
8ed705af IA |
543 | EXPORT_SYMBOL_GPL(comedi_auto_config); |
544 | ||
545 | void comedi_auto_unconfig(struct device *hardware_device) | |
ed9eccbe | 546 | { |
c43435d7 IA |
547 | if (hardware_device == NULL) |
548 | return; | |
3346b798 | 549 | comedi_release_hardware_device(hardware_device); |
ed9eccbe | 550 | } |
8ed705af | 551 | EXPORT_SYMBOL_GPL(comedi_auto_unconfig); |
1ae6b20b HS |
552 | |
553 | int comedi_driver_register(struct comedi_driver *driver) | |
554 | { | |
555 | driver->next = comedi_drivers; | |
556 | comedi_drivers = driver; | |
557 | ||
558 | return 0; | |
559 | } | |
5660e742 | 560 | EXPORT_SYMBOL_GPL(comedi_driver_register); |
1ae6b20b HS |
561 | |
562 | int comedi_driver_unregister(struct comedi_driver *driver) | |
563 | { | |
564 | struct comedi_driver *prev; | |
565 | int i; | |
566 | ||
567 | /* check for devices using this driver */ | |
568 | for (i = 0; i < COMEDI_NUM_BOARD_MINORS; i++) { | |
569 | struct comedi_device *dev = comedi_dev_from_minor(i); | |
570 | ||
571 | if (!dev) | |
572 | continue; | |
573 | ||
574 | mutex_lock(&dev->mutex); | |
575 | if (dev->attached && dev->driver == driver) { | |
576 | if (dev->use_count) | |
577 | dev_warn(dev->class_dev, | |
578 | "BUG! detaching device with use_count=%d\n", | |
579 | dev->use_count); | |
580 | comedi_device_detach(dev); | |
581 | } | |
582 | mutex_unlock(&dev->mutex); | |
583 | } | |
584 | ||
585 | if (comedi_drivers == driver) { | |
586 | comedi_drivers = driver->next; | |
587 | return 0; | |
588 | } | |
589 | ||
590 | for (prev = comedi_drivers; prev->next; prev = prev->next) { | |
591 | if (prev->next == driver) { | |
592 | prev->next = driver->next; | |
593 | return 0; | |
594 | } | |
595 | } | |
596 | return -EINVAL; | |
597 | } | |
5660e742 | 598 | EXPORT_SYMBOL_GPL(comedi_driver_unregister); |