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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; |
3df9f21a | 41 | /* protects access to comedi_drivers */ |
c383e2d6 | 42 | DEFINE_MUTEX(comedi_drivers_list_lock); |
ed9eccbe | 43 | |
da717511 IA |
44 | int comedi_set_hw_dev(struct comedi_device *dev, struct device *hw_dev) |
45 | { | |
de06d7c6 IA |
46 | if (hw_dev == dev->hw_dev) |
47 | return 0; | |
48 | if (dev->hw_dev != NULL) | |
49 | return -EEXIST; | |
da717511 | 50 | dev->hw_dev = get_device(hw_dev); |
da717511 IA |
51 | return 0; |
52 | } | |
53 | EXPORT_SYMBOL_GPL(comedi_set_hw_dev); | |
54 | ||
de06d7c6 IA |
55 | static void comedi_clear_hw_dev(struct comedi_device *dev) |
56 | { | |
57 | put_device(dev->hw_dev); | |
58 | dev->hw_dev = NULL; | |
59 | } | |
60 | ||
54db996e HS |
61 | /** |
62 | * comedi_alloc_devpriv() - Allocate memory for the device private data. | |
63 | * @dev: comedi_device struct | |
64 | * @size: size of the memory to allocate | |
65 | */ | |
66 | void *comedi_alloc_devpriv(struct comedi_device *dev, size_t size) | |
67 | { | |
68 | dev->private = kzalloc(size, GFP_KERNEL); | |
69 | return dev->private; | |
70 | } | |
71 | EXPORT_SYMBOL_GPL(comedi_alloc_devpriv); | |
72 | ||
8b9ba6e5 | 73 | int comedi_alloc_subdevices(struct comedi_device *dev, int num_subdevices) |
2f0b9d08 | 74 | { |
03afcf47 | 75 | struct comedi_subdevice *s; |
8b9ba6e5 | 76 | int i; |
2f0b9d08 | 77 | |
7f801c41 HS |
78 | if (num_subdevices < 1) |
79 | return -EINVAL; | |
03afcf47 HS |
80 | |
81 | s = kcalloc(num_subdevices, sizeof(*s), GFP_KERNEL); | |
82 | if (!s) | |
2f0b9d08 | 83 | return -ENOMEM; |
03afcf47 | 84 | dev->subdevices = s; |
fba1d0fa | 85 | dev->n_subdevices = num_subdevices; |
03afcf47 | 86 | |
2f0b9d08 | 87 | for (i = 0; i < num_subdevices; ++i) { |
5e4c58ce | 88 | s = &dev->subdevices[i]; |
03afcf47 | 89 | s->device = dev; |
90a35c15 | 90 | s->index = i; |
03afcf47 HS |
91 | s->async_dma_dir = DMA_NONE; |
92 | spin_lock_init(&s->spin_lock); | |
93 | s->minor = -1; | |
2f0b9d08 HS |
94 | } |
95 | return 0; | |
96 | } | |
97 | EXPORT_SYMBOL_GPL(comedi_alloc_subdevices); | |
98 | ||
d2762066 HS |
99 | /** |
100 | * comedi_alloc_subdev_readback() - Allocate memory for the subdevice readback. | |
101 | * @s: comedi_subdevice struct | |
102 | */ | |
103 | int comedi_alloc_subdev_readback(struct comedi_subdevice *s) | |
104 | { | |
105 | if (!s->n_chan) | |
106 | return -EINVAL; | |
107 | ||
108 | s->readback = kcalloc(s->n_chan, sizeof(*s->readback), GFP_KERNEL); | |
109 | if (!s->readback) | |
110 | return -ENOMEM; | |
111 | return 0; | |
112 | } | |
113 | EXPORT_SYMBOL_GPL(comedi_alloc_subdev_readback); | |
114 | ||
3867e20d | 115 | static void comedi_device_detach_cleanup(struct comedi_device *dev) |
ed9eccbe DS |
116 | { |
117 | int i; | |
34c43922 | 118 | struct comedi_subdevice *s; |
ed9eccbe DS |
119 | |
120 | if (dev->subdevices) { | |
121 | for (i = 0; i < dev->n_subdevices; i++) { | |
5e4c58ce | 122 | s = &dev->subdevices[i]; |
588ba6dc HS |
123 | if (s->runflags & SRF_FREE_SPRIV) |
124 | kfree(s->private); | |
ed9eccbe DS |
125 | comedi_free_subdevice_minor(s); |
126 | if (s->async) { | |
127 | comedi_buf_alloc(dev, s, 0); | |
128 | kfree(s->async); | |
129 | } | |
d2762066 | 130 | kfree(s->readback); |
ed9eccbe DS |
131 | } |
132 | kfree(dev->subdevices); | |
133 | dev->subdevices = NULL; | |
134 | dev->n_subdevices = 0; | |
135 | } | |
dedd1325 BP |
136 | kfree(dev->private); |
137 | dev->private = NULL; | |
7029a874 | 138 | dev->driver = NULL; |
ed9eccbe DS |
139 | dev->board_name = NULL; |
140 | dev->board_ptr = NULL; | |
d7e6dc13 | 141 | dev->mmio = NULL; |
ed9eccbe | 142 | dev->iobase = 0; |
316f97f1 | 143 | dev->iolen = 0; |
00ca6884 | 144 | dev->ioenabled = false; |
ed9eccbe DS |
145 | dev->irq = 0; |
146 | dev->read_subdev = NULL; | |
147 | dev->write_subdev = NULL; | |
148 | dev->open = NULL; | |
149 | dev->close = NULL; | |
de06d7c6 | 150 | comedi_clear_hw_dev(dev); |
ed9eccbe DS |
151 | } |
152 | ||
016599f5 | 153 | void comedi_device_detach(struct comedi_device *dev) |
ed9eccbe | 154 | { |
d19db51a | 155 | comedi_device_cancel_all(dev); |
bf11c134 | 156 | down_write(&dev->attach_lock); |
a7401cdd | 157 | dev->attached = false; |
ef77c0b2 | 158 | dev->detach_count++; |
5617f9da | 159 | if (dev->driver) |
ed9eccbe | 160 | dev->driver->detach(dev); |
3867e20d | 161 | comedi_device_detach_cleanup(dev); |
bf11c134 | 162 | up_write(&dev->attach_lock); |
ed9eccbe DS |
163 | } |
164 | ||
01fca378 | 165 | static int poll_invalid(struct comedi_device *dev, struct comedi_subdevice *s) |
ed9eccbe | 166 | { |
01fca378 | 167 | return -EINVAL; |
ed9eccbe DS |
168 | } |
169 | ||
01fca378 HS |
170 | int insn_inval(struct comedi_device *dev, struct comedi_subdevice *s, |
171 | struct comedi_insn *insn, unsigned int *data) | |
ed9eccbe | 172 | { |
01fca378 | 173 | return -EINVAL; |
ed9eccbe DS |
174 | } |
175 | ||
d2762066 HS |
176 | /** |
177 | * comedi_readback_insn_read() - A generic (*insn_read) for subdevice readback. | |
178 | * @dev: comedi_device struct | |
179 | * @s: comedi_subdevice struct | |
180 | * @insn: comedi_insn struct | |
181 | * @data: pointer to return the readback data | |
182 | */ | |
183 | int comedi_readback_insn_read(struct comedi_device *dev, | |
184 | struct comedi_subdevice *s, | |
185 | struct comedi_insn *insn, | |
186 | unsigned int *data) | |
187 | { | |
188 | unsigned int chan = CR_CHAN(insn->chanspec); | |
189 | int i; | |
190 | ||
191 | if (!s->readback) | |
192 | return -EINVAL; | |
193 | ||
194 | for (i = 0; i < insn->n; i++) | |
195 | data[i] = s->readback[chan]; | |
196 | ||
197 | return insn->n; | |
198 | } | |
199 | EXPORT_SYMBOL_GPL(comedi_readback_insn_read); | |
200 | ||
91506408 HS |
201 | /** |
202 | * comedi_timeout() - busy-wait for a driver condition to occur. | |
203 | * @dev: comedi_device struct | |
204 | * @s: comedi_subdevice struct | |
205 | * @insn: comedi_insn struct | |
206 | * @cb: callback to check for the condition | |
207 | * @context: private context from the driver | |
208 | */ | |
209 | int comedi_timeout(struct comedi_device *dev, | |
210 | struct comedi_subdevice *s, | |
211 | struct comedi_insn *insn, | |
212 | int (*cb)(struct comedi_device *dev, | |
213 | struct comedi_subdevice *s, | |
214 | struct comedi_insn *insn, | |
215 | unsigned long context), | |
216 | unsigned long context) | |
217 | { | |
218 | unsigned long timeout = jiffies + msecs_to_jiffies(COMEDI_TIMEOUT_MS); | |
219 | int ret; | |
220 | ||
221 | while (time_before(jiffies, timeout)) { | |
222 | ret = cb(dev, s, insn, context); | |
223 | if (ret != -EBUSY) | |
224 | return ret; /* success (0) or non EBUSY errno */ | |
225 | cpu_relax(); | |
226 | } | |
227 | return -ETIMEDOUT; | |
228 | } | |
229 | EXPORT_SYMBOL_GPL(comedi_timeout); | |
230 | ||
e523c6c8 HS |
231 | /** |
232 | * comedi_dio_insn_config() - boilerplate (*insn_config) for DIO subdevices. | |
233 | * @dev: comedi_device struct | |
234 | * @s: comedi_subdevice struct | |
235 | * @insn: comedi_insn struct | |
236 | * @data: parameters for the @insn | |
237 | * @mask: io_bits mask for grouped channels | |
238 | */ | |
239 | int comedi_dio_insn_config(struct comedi_device *dev, | |
240 | struct comedi_subdevice *s, | |
241 | struct comedi_insn *insn, | |
242 | unsigned int *data, | |
243 | unsigned int mask) | |
244 | { | |
245 | unsigned int chan_mask = 1 << CR_CHAN(insn->chanspec); | |
246 | ||
247 | if (!mask) | |
248 | mask = chan_mask; | |
249 | ||
250 | switch (data[0]) { | |
251 | case INSN_CONFIG_DIO_INPUT: | |
252 | s->io_bits &= ~mask; | |
253 | break; | |
254 | ||
255 | case INSN_CONFIG_DIO_OUTPUT: | |
256 | s->io_bits |= mask; | |
257 | break; | |
258 | ||
259 | case INSN_CONFIG_DIO_QUERY: | |
260 | data[1] = (s->io_bits & mask) ? COMEDI_OUTPUT : COMEDI_INPUT; | |
261 | return insn->n; | |
262 | ||
263 | default: | |
264 | return -EINVAL; | |
265 | } | |
266 | ||
267 | return 0; | |
268 | } | |
269 | EXPORT_SYMBOL_GPL(comedi_dio_insn_config); | |
270 | ||
05e60b13 HS |
271 | /** |
272 | * comedi_dio_update_state() - update the internal state of DIO subdevices. | |
273 | * @s: comedi_subdevice struct | |
274 | * @data: the channel mask and bits to update | |
275 | */ | |
276 | unsigned int comedi_dio_update_state(struct comedi_subdevice *s, | |
277 | unsigned int *data) | |
278 | { | |
279 | unsigned int chanmask = (s->n_chan < 32) ? ((1 << s->n_chan) - 1) | |
280 | : 0xffffffff; | |
281 | unsigned int mask = data[0] & chanmask; | |
282 | unsigned int bits = data[1]; | |
283 | ||
284 | if (mask) { | |
285 | s->state &= ~mask; | |
286 | s->state |= (bits & mask); | |
287 | } | |
288 | ||
289 | return mask; | |
290 | } | |
291 | EXPORT_SYMBOL_GPL(comedi_dio_update_state); | |
292 | ||
f146fe63 IA |
293 | /** |
294 | * comedi_bytes_per_scan - get length of asynchronous command "scan" in bytes | |
295 | * @s: comedi_subdevice struct | |
296 | * | |
297 | * Determines the overall scan length according to the subdevice type and the | |
298 | * number of channels in the scan. | |
299 | * | |
300 | * For digital input, output or input/output subdevices, samples for multiple | |
301 | * channels are assumed to be packed into one or more unsigned short or | |
302 | * unsigned int values according to the subdevice's SDF_LSAMPL flag. For other | |
303 | * types of subdevice, samples are assumed to occupy a whole unsigned short or | |
304 | * unsigned int according to the SDF_LSAMPL flag. | |
305 | * | |
306 | * Returns the overall scan length in bytes. | |
307 | */ | |
308 | unsigned int comedi_bytes_per_scan(struct comedi_subdevice *s) | |
309 | { | |
310 | struct comedi_cmd *cmd = &s->async->cmd; | |
311 | unsigned int num_samples; | |
312 | unsigned int bits_per_sample; | |
313 | ||
314 | switch (s->type) { | |
315 | case COMEDI_SUBD_DI: | |
316 | case COMEDI_SUBD_DO: | |
317 | case COMEDI_SUBD_DIO: | |
318 | bits_per_sample = 8 * bytes_per_sample(s); | |
319 | num_samples = (cmd->chanlist_len + bits_per_sample - 1) / | |
320 | bits_per_sample; | |
321 | break; | |
322 | default: | |
323 | num_samples = cmd->chanlist_len; | |
324 | break; | |
325 | } | |
326 | return num_samples * bytes_per_sample(s); | |
327 | } | |
328 | EXPORT_SYMBOL_GPL(comedi_bytes_per_scan); | |
329 | ||
01fca378 HS |
330 | static int insn_rw_emulate_bits(struct comedi_device *dev, |
331 | struct comedi_subdevice *s, | |
332 | struct comedi_insn *insn, unsigned int *data) | |
ed9eccbe | 333 | { |
01fca378 HS |
334 | struct comedi_insn new_insn; |
335 | int ret; | |
336 | static const unsigned channels_per_bitfield = 32; | |
ed9eccbe | 337 | |
01fca378 HS |
338 | unsigned chan = CR_CHAN(insn->chanspec); |
339 | const unsigned base_bitfield_channel = | |
340 | (chan < channels_per_bitfield) ? 0 : chan; | |
341 | unsigned int new_data[2]; | |
1e4742df | 342 | |
01fca378 HS |
343 | memset(new_data, 0, sizeof(new_data)); |
344 | memset(&new_insn, 0, sizeof(new_insn)); | |
345 | new_insn.insn = INSN_BITS; | |
346 | new_insn.chanspec = base_bitfield_channel; | |
347 | new_insn.n = 2; | |
348 | new_insn.subdev = insn->subdev; | |
ed9eccbe | 349 | |
01fca378 HS |
350 | if (insn->insn == INSN_WRITE) { |
351 | if (!(s->subdev_flags & SDF_WRITABLE)) | |
352 | return -EINVAL; | |
353 | new_data[0] = 1 << (chan - base_bitfield_channel); /* mask */ | |
354 | new_data[1] = data[0] ? (1 << (chan - base_bitfield_channel)) | |
355 | : 0; /* bits */ | |
ed9eccbe DS |
356 | } |
357 | ||
01fca378 HS |
358 | ret = s->insn_bits(dev, s, &new_insn, new_data); |
359 | if (ret < 0) | |
360 | return ret; | |
ed9eccbe | 361 | |
01fca378 HS |
362 | if (insn->insn == INSN_READ) |
363 | data[0] = (new_data[1] >> (chan - base_bitfield_channel)) & 1; | |
364 | ||
365 | return 1; | |
ed9eccbe DS |
366 | } |
367 | ||
40f58a65 HS |
368 | static int __comedi_device_postconfig_async(struct comedi_device *dev, |
369 | struct comedi_subdevice *s) | |
370 | { | |
371 | struct comedi_async *async; | |
372 | unsigned int buf_size; | |
373 | int ret; | |
374 | ||
57b71c3e HS |
375 | if ((s->subdev_flags & (SDF_CMD_READ | SDF_CMD_WRITE)) == 0) { |
376 | dev_warn(dev->class_dev, | |
377 | "async subdevices must support SDF_CMD_READ or SDF_CMD_WRITE\n"); | |
378 | return -EINVAL; | |
379 | } | |
380 | if (!s->do_cmdtest) { | |
381 | dev_warn(dev->class_dev, | |
382 | "async subdevices must have a do_cmdtest() function\n"); | |
383 | return -EINVAL; | |
384 | } | |
40f58a65 HS |
385 | |
386 | async = kzalloc(sizeof(*async), GFP_KERNEL); | |
78110bb8 | 387 | if (!async) |
40f58a65 | 388 | return -ENOMEM; |
78110bb8 | 389 | |
40f58a65 | 390 | init_waitqueue_head(&async->wait_head); |
40f58a65 HS |
391 | s->async = async; |
392 | ||
393 | async->max_bufsize = comedi_default_buf_maxsize_kb * 1024; | |
394 | buf_size = comedi_default_buf_size_kb * 1024; | |
395 | if (buf_size > async->max_bufsize) | |
396 | buf_size = async->max_bufsize; | |
397 | ||
398 | if (comedi_buf_alloc(dev, s, buf_size) < 0) { | |
399 | dev_warn(dev->class_dev, "Buffer allocation failed\n"); | |
400 | return -ENOMEM; | |
401 | } | |
402 | if (s->buf_change) { | |
d546b896 | 403 | ret = s->buf_change(dev, s); |
40f58a65 HS |
404 | if (ret < 0) |
405 | return ret; | |
406 | } | |
407 | ||
f65cc544 | 408 | comedi_alloc_subdevice_minor(s); |
40f58a65 HS |
409 | |
410 | return 0; | |
411 | } | |
412 | ||
413 | static int __comedi_device_postconfig(struct comedi_device *dev) | |
ed9eccbe | 414 | { |
34c43922 | 415 | struct comedi_subdevice *s; |
ed9eccbe | 416 | int ret; |
40f58a65 | 417 | int i; |
ed9eccbe DS |
418 | |
419 | for (i = 0; i < dev->n_subdevices; i++) { | |
5e4c58ce | 420 | s = &dev->subdevices[i]; |
ed9eccbe DS |
421 | |
422 | if (s->type == COMEDI_SUBD_UNUSED) | |
423 | continue; | |
424 | ||
09567cb4 HS |
425 | if (s->type == COMEDI_SUBD_DO) { |
426 | if (s->n_chan < 32) | |
427 | s->io_bits = (1 << s->n_chan) - 1; | |
428 | else | |
429 | s->io_bits = 0xffffffff; | |
430 | } | |
431 | ||
ed9eccbe DS |
432 | if (s->len_chanlist == 0) |
433 | s->len_chanlist = 1; | |
434 | ||
435 | if (s->do_cmd) { | |
40f58a65 HS |
436 | ret = __comedi_device_postconfig_async(dev, s); |
437 | if (ret) | |
438 | return ret; | |
ed9eccbe DS |
439 | } |
440 | ||
441 | if (!s->range_table && !s->range_table_list) | |
442 | s->range_table = &range_unknown; | |
443 | ||
444 | if (!s->insn_read && s->insn_bits) | |
445 | s->insn_read = insn_rw_emulate_bits; | |
446 | if (!s->insn_write && s->insn_bits) | |
447 | s->insn_write = insn_rw_emulate_bits; | |
448 | ||
449 | if (!s->insn_read) | |
450 | s->insn_read = insn_inval; | |
451 | if (!s->insn_write) | |
452 | s->insn_write = insn_inval; | |
453 | if (!s->insn_bits) | |
454 | s->insn_bits = insn_inval; | |
455 | if (!s->insn_config) | |
456 | s->insn_config = insn_inval; | |
457 | ||
458 | if (!s->poll) | |
459 | s->poll = poll_invalid; | |
460 | } | |
461 | ||
462 | return 0; | |
463 | } | |
464 | ||
01fca378 | 465 | /* do a little post-config cleanup */ |
01fca378 HS |
466 | static int comedi_device_postconfig(struct comedi_device *dev) |
467 | { | |
b2a644b4 IA |
468 | int ret; |
469 | ||
470 | ret = __comedi_device_postconfig(dev); | |
ae5dd5fc | 471 | if (ret < 0) |
01fca378 | 472 | return ret; |
bf11c134 | 473 | down_write(&dev->attach_lock); |
a7401cdd | 474 | dev->attached = true; |
bf11c134 | 475 | up_write(&dev->attach_lock); |
01fca378 HS |
476 | return 0; |
477 | } | |
478 | ||
4e2f002f IA |
479 | /* |
480 | * Generic recognize function for drivers that register their supported | |
481 | * board names. | |
482 | * | |
483 | * 'driv->board_name' points to a 'const char *' member within the | |
484 | * zeroth element of an array of some private board information | |
485 | * structure, say 'struct foo_board' containing a member 'const char | |
486 | * *board_name' that is initialized to point to a board name string that | |
487 | * is one of the candidates matched against this function's 'name' | |
488 | * parameter. | |
489 | * | |
490 | * 'driv->offset' is the size of the private board information | |
491 | * structure, say 'sizeof(struct foo_board)', and 'driv->num_names' is | |
492 | * the length of the array of private board information structures. | |
493 | * | |
494 | * If one of the board names in the array of private board information | |
495 | * structures matches the name supplied to this function, the function | |
496 | * returns a pointer to the pointer to the board name, otherwise it | |
497 | * returns NULL. The return value ends up in the 'board_ptr' member of | |
498 | * a 'struct comedi_device' that the low-level comedi driver's | |
499 | * 'attach()' hook can convert to a point to a particular element of its | |
500 | * array of private board information structures by subtracting the | |
501 | * offset of the member that points to the board name. (No subtraction | |
502 | * is required if the board name pointer is the first member of the | |
503 | * private board information structure, which is generally the case.) | |
504 | */ | |
7029a874 | 505 | static void *comedi_recognize(struct comedi_driver *driv, const char *name) |
ed9eccbe | 506 | { |
1c9de58a DC |
507 | char **name_ptr = (char **)driv->board_name; |
508 | int i; | |
509 | ||
ed9eccbe DS |
510 | for (i = 0; i < driv->num_names; i++) { |
511 | if (strcmp(*name_ptr, name) == 0) | |
1c9de58a DC |
512 | return name_ptr; |
513 | name_ptr = (void *)name_ptr + driv->offset; | |
ed9eccbe DS |
514 | } |
515 | ||
516 | return NULL; | |
517 | } | |
518 | ||
7029a874 | 519 | static void comedi_report_boards(struct comedi_driver *driv) |
ed9eccbe DS |
520 | { |
521 | unsigned int i; | |
522 | const char *const *name_ptr; | |
523 | ||
4f870fe6 IA |
524 | pr_info("comedi: valid board names for %s driver are:\n", |
525 | driv->driver_name); | |
ed9eccbe DS |
526 | |
527 | name_ptr = driv->board_name; | |
528 | for (i = 0; i < driv->num_names; i++) { | |
4f870fe6 | 529 | pr_info(" %s\n", *name_ptr); |
ed9eccbe DS |
530 | name_ptr = (const char **)((char *)name_ptr + driv->offset); |
531 | } | |
532 | ||
533 | if (driv->num_names == 0) | |
4f870fe6 | 534 | pr_info(" %s\n", driv->driver_name); |
ed9eccbe DS |
535 | } |
536 | ||
9ff8b151 HS |
537 | /** |
538 | * comedi_load_firmware() - Request and load firmware for a device. | |
539 | * @dev: comedi_device struct | |
540 | * @hw_device: device struct for the comedi_device | |
541 | * @name: the name of the firmware image | |
542 | * @cb: callback to the upload the firmware image | |
d569541e | 543 | * @context: private context from the driver |
9ff8b151 HS |
544 | */ |
545 | int comedi_load_firmware(struct comedi_device *dev, | |
546 | struct device *device, | |
547 | const char *name, | |
548 | int (*cb)(struct comedi_device *dev, | |
d569541e HS |
549 | const u8 *data, size_t size, |
550 | unsigned long context), | |
551 | unsigned long context) | |
9ff8b151 HS |
552 | { |
553 | const struct firmware *fw; | |
554 | int ret; | |
555 | ||
556 | if (!cb) | |
557 | return -EINVAL; | |
558 | ||
559 | ret = request_firmware(&fw, name, device); | |
560 | if (ret == 0) { | |
d569541e | 561 | ret = cb(dev, fw->data, fw->size, context); |
9ff8b151 HS |
562 | release_firmware(fw); |
563 | } | |
564 | ||
c6236c0c | 565 | return ret < 0 ? ret : 0; |
9ff8b151 HS |
566 | } |
567 | EXPORT_SYMBOL_GPL(comedi_load_firmware); | |
568 | ||
f375ac5f | 569 | /** |
ca8b2964 | 570 | * __comedi_request_region() - Request an I/O reqion for a legacy driver. |
f375ac5f HS |
571 | * @dev: comedi_device struct |
572 | * @start: base address of the I/O reqion | |
573 | * @len: length of the I/O region | |
574 | */ | |
ca8b2964 HS |
575 | int __comedi_request_region(struct comedi_device *dev, |
576 | unsigned long start, unsigned long len) | |
f375ac5f HS |
577 | { |
578 | if (!start) { | |
579 | dev_warn(dev->class_dev, | |
580 | "%s: a I/O base address must be specified\n", | |
581 | dev->board_name); | |
582 | return -EINVAL; | |
583 | } | |
584 | ||
585 | if (!request_region(start, len, dev->board_name)) { | |
586 | dev_warn(dev->class_dev, "%s: I/O port conflict (%#lx,%lu)\n", | |
587 | dev->board_name, start, len); | |
588 | return -EIO; | |
589 | } | |
f375ac5f HS |
590 | |
591 | return 0; | |
592 | } | |
ca8b2964 HS |
593 | EXPORT_SYMBOL_GPL(__comedi_request_region); |
594 | ||
595 | /** | |
596 | * comedi_request_region() - Request an I/O reqion for a legacy driver. | |
597 | * @dev: comedi_device struct | |
598 | * @start: base address of the I/O reqion | |
599 | * @len: length of the I/O region | |
600 | */ | |
601 | int comedi_request_region(struct comedi_device *dev, | |
602 | unsigned long start, unsigned long len) | |
603 | { | |
604 | int ret; | |
605 | ||
606 | ret = __comedi_request_region(dev, start, len); | |
316f97f1 | 607 | if (ret == 0) { |
ca8b2964 | 608 | dev->iobase = start; |
316f97f1 HS |
609 | dev->iolen = len; |
610 | } | |
ca8b2964 HS |
611 | |
612 | return ret; | |
613 | } | |
f375ac5f HS |
614 | EXPORT_SYMBOL_GPL(comedi_request_region); |
615 | ||
316f97f1 HS |
616 | /** |
617 | * comedi_legacy_detach() - A generic (*detach) function for legacy drivers. | |
618 | * @dev: comedi_device struct | |
619 | */ | |
620 | void comedi_legacy_detach(struct comedi_device *dev) | |
621 | { | |
3d1fe3f7 HS |
622 | if (dev->irq) { |
623 | free_irq(dev->irq, dev); | |
624 | dev->irq = 0; | |
625 | } | |
316f97f1 HS |
626 | if (dev->iobase && dev->iolen) { |
627 | release_region(dev->iobase, dev->iolen); | |
628 | dev->iobase = 0; | |
629 | dev->iolen = 0; | |
630 | } | |
631 | } | |
632 | EXPORT_SYMBOL_GPL(comedi_legacy_detach); | |
633 | ||
01fca378 | 634 | int comedi_device_attach(struct comedi_device *dev, struct comedi_devconfig *it) |
ed9eccbe | 635 | { |
01fca378 HS |
636 | struct comedi_driver *driv; |
637 | int ret; | |
638 | ||
639 | if (dev->attached) | |
640 | return -EBUSY; | |
641 | ||
c383e2d6 | 642 | mutex_lock(&comedi_drivers_list_lock); |
01fca378 HS |
643 | for (driv = comedi_drivers; driv; driv = driv->next) { |
644 | if (!try_module_get(driv->module)) | |
645 | continue; | |
646 | if (driv->num_names) { | |
647 | dev->board_ptr = comedi_recognize(driv, it->board_name); | |
648 | if (dev->board_ptr) | |
649 | break; | |
3df9f21a | 650 | } else if (strcmp(driv->driver_name, it->board_name) == 0) { |
01fca378 | 651 | break; |
3df9f21a | 652 | } |
01fca378 HS |
653 | module_put(driv->module); |
654 | } | |
655 | if (driv == NULL) { | |
656 | /* recognize has failed if we get here */ | |
657 | /* report valid board names before returning error */ | |
658 | for (driv = comedi_drivers; driv; driv = driv->next) { | |
659 | if (!try_module_get(driv->module)) | |
660 | continue; | |
661 | comedi_report_boards(driv); | |
662 | module_put(driv->module); | |
663 | } | |
c383e2d6 IA |
664 | ret = -EIO; |
665 | goto out; | |
01fca378 HS |
666 | } |
667 | if (driv->attach == NULL) { | |
668 | /* driver does not support manual configuration */ | |
669 | dev_warn(dev->class_dev, | |
670 | "driver '%s' does not support attach using comedi_config\n", | |
671 | driv->driver_name); | |
672 | module_put(driv->module); | |
c383e2d6 IA |
673 | ret = -ENOSYS; |
674 | goto out; | |
01fca378 | 675 | } |
01fca378 | 676 | dev->driver = driv; |
34b68400 HS |
677 | dev->board_name = dev->board_ptr ? *(const char **)dev->board_ptr |
678 | : dev->driver->driver_name; | |
01fca378 | 679 | ret = driv->attach(dev, it); |
74ece108 IA |
680 | if (ret >= 0) |
681 | ret = comedi_device_postconfig(dev); | |
01fca378 | 682 | if (ret < 0) { |
016599f5 | 683 | comedi_device_detach(dev); |
3955dfa8 | 684 | module_put(driv->module); |
01fca378 | 685 | } |
b2a644b4 | 686 | /* On success, the driver module count has been incremented. */ |
c383e2d6 IA |
687 | out: |
688 | mutex_unlock(&comedi_drivers_list_lock); | |
b2a644b4 | 689 | return ret; |
ed9eccbe DS |
690 | } |
691 | ||
a588da1d IA |
692 | int comedi_auto_config(struct device *hardware_device, |
693 | struct comedi_driver *driver, unsigned long context) | |
f4011670 | 694 | { |
6013a9a5 | 695 | struct comedi_device *dev; |
f4011670 IA |
696 | int ret; |
697 | ||
f08e0ac5 IA |
698 | if (!hardware_device) { |
699 | pr_warn("BUG! comedi_auto_config called with NULL hardware_device\n"); | |
700 | return -EINVAL; | |
701 | } | |
702 | if (!driver) { | |
703 | dev_warn(hardware_device, | |
704 | "BUG! comedi_auto_config called with NULL comedi driver\n"); | |
705 | return -EINVAL; | |
706 | } | |
707 | ||
a588da1d IA |
708 | if (!driver->auto_attach) { |
709 | dev_warn(hardware_device, | |
710 | "BUG! comedi driver '%s' has no auto_attach handler\n", | |
711 | driver->driver_name); | |
712 | return -EINVAL; | |
713 | } | |
714 | ||
6013a9a5 | 715 | dev = comedi_alloc_board_minor(hardware_device); |
bcb6232d BP |
716 | if (IS_ERR(dev)) { |
717 | dev_warn(hardware_device, | |
718 | "driver '%s' could not create device.\n", | |
719 | driver->driver_name); | |
6013a9a5 | 720 | return PTR_ERR(dev); |
bcb6232d | 721 | } |
6013a9a5 | 722 | /* Note: comedi_alloc_board_minor() locked dev->mutex. */ |
f4011670 | 723 | |
6013a9a5 | 724 | dev->driver = driver; |
34b68400 | 725 | dev->board_name = dev->driver->driver_name; |
6013a9a5 | 726 | ret = driver->auto_attach(dev, context); |
74ece108 | 727 | if (ret >= 0) |
6013a9a5 | 728 | ret = comedi_device_postconfig(dev); |
6013a9a5 | 729 | mutex_unlock(&dev->mutex); |
f4011670 | 730 | |
bcb6232d BP |
731 | if (ret < 0) { |
732 | dev_warn(hardware_device, | |
733 | "driver '%s' failed to auto-configure device.\n", | |
734 | driver->driver_name); | |
f5b31e15 | 735 | comedi_release_hardware_device(hardware_device); |
bcb6232d BP |
736 | } else { |
737 | /* | |
738 | * class_dev should be set properly here | |
739 | * after a successful auto config | |
740 | */ | |
741 | dev_info(dev->class_dev, | |
742 | "driver '%s' has successfully auto-configured '%s'.\n", | |
743 | driver->driver_name, dev->board_name); | |
744 | } | |
f4011670 IA |
745 | return ret; |
746 | } | |
8ed705af IA |
747 | EXPORT_SYMBOL_GPL(comedi_auto_config); |
748 | ||
749 | void comedi_auto_unconfig(struct device *hardware_device) | |
ed9eccbe | 750 | { |
c43435d7 IA |
751 | if (hardware_device == NULL) |
752 | return; | |
3346b798 | 753 | comedi_release_hardware_device(hardware_device); |
ed9eccbe | 754 | } |
8ed705af | 755 | EXPORT_SYMBOL_GPL(comedi_auto_unconfig); |
1ae6b20b HS |
756 | |
757 | int comedi_driver_register(struct comedi_driver *driver) | |
758 | { | |
c383e2d6 | 759 | mutex_lock(&comedi_drivers_list_lock); |
1ae6b20b HS |
760 | driver->next = comedi_drivers; |
761 | comedi_drivers = driver; | |
c383e2d6 | 762 | mutex_unlock(&comedi_drivers_list_lock); |
1ae6b20b HS |
763 | |
764 | return 0; | |
765 | } | |
5660e742 | 766 | EXPORT_SYMBOL_GPL(comedi_driver_register); |
1ae6b20b | 767 | |
99c0e269 | 768 | void comedi_driver_unregister(struct comedi_driver *driver) |
1ae6b20b HS |
769 | { |
770 | struct comedi_driver *prev; | |
771 | int i; | |
772 | ||
c383e2d6 IA |
773 | /* unlink the driver */ |
774 | mutex_lock(&comedi_drivers_list_lock); | |
775 | if (comedi_drivers == driver) { | |
776 | comedi_drivers = driver->next; | |
777 | } else { | |
778 | for (prev = comedi_drivers; prev->next; prev = prev->next) { | |
779 | if (prev->next == driver) { | |
780 | prev->next = driver->next; | |
781 | break; | |
782 | } | |
783 | } | |
784 | } | |
785 | mutex_unlock(&comedi_drivers_list_lock); | |
786 | ||
1ae6b20b HS |
787 | /* check for devices using this driver */ |
788 | for (i = 0; i < COMEDI_NUM_BOARD_MINORS; i++) { | |
a200fadc | 789 | struct comedi_device *dev = comedi_dev_get_from_minor(i); |
1ae6b20b HS |
790 | |
791 | if (!dev) | |
792 | continue; | |
793 | ||
794 | mutex_lock(&dev->mutex); | |
795 | if (dev->attached && dev->driver == driver) { | |
796 | if (dev->use_count) | |
797 | dev_warn(dev->class_dev, | |
798 | "BUG! detaching device with use_count=%d\n", | |
799 | dev->use_count); | |
800 | comedi_device_detach(dev); | |
801 | } | |
802 | mutex_unlock(&dev->mutex); | |
a200fadc | 803 | comedi_dev_put(dev); |
1ae6b20b | 804 | } |
1ae6b20b | 805 | } |
5660e742 | 806 | EXPORT_SYMBOL_GPL(comedi_driver_unregister); |