Commit | Line | Data |
---|---|---|
ed9eccbe | 1 | /* |
50fbb884 MC |
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 | * Copyright (C) 2002 Frank Mori Hess <fmhess@users.sourceforge.net> | |
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. | |
ed9eccbe DS |
18 | */ |
19 | ||
ed9eccbe DS |
20 | #include <linux/device.h> |
21 | #include <linux/module.h> | |
ed9eccbe DS |
22 | #include <linux/errno.h> |
23 | #include <linux/kernel.h> | |
ed9eccbe | 24 | #include <linux/ioport.h> |
ed9eccbe | 25 | #include <linux/slab.h> |
ed9eccbe | 26 | #include <linux/dma-mapping.h> |
3d1fe3f7 | 27 | #include <linux/interrupt.h> |
9ff8b151 | 28 | #include <linux/firmware.h> |
ed9eccbe | 29 | |
242e7ad9 | 30 | #include "comedidev.h" |
3a5fa275 | 31 | #include "comedi_internal.h" |
242e7ad9 | 32 | |
139dfbdf | 33 | struct comedi_driver *comedi_drivers; |
3df9f21a | 34 | /* protects access to comedi_drivers */ |
c383e2d6 | 35 | DEFINE_MUTEX(comedi_drivers_list_lock); |
ed9eccbe | 36 | |
da717511 IA |
37 | int comedi_set_hw_dev(struct comedi_device *dev, struct device *hw_dev) |
38 | { | |
de06d7c6 IA |
39 | if (hw_dev == dev->hw_dev) |
40 | return 0; | |
e2850160 | 41 | if (dev->hw_dev) |
de06d7c6 | 42 | return -EEXIST; |
da717511 | 43 | dev->hw_dev = get_device(hw_dev); |
da717511 IA |
44 | return 0; |
45 | } | |
46 | EXPORT_SYMBOL_GPL(comedi_set_hw_dev); | |
47 | ||
de06d7c6 IA |
48 | static void comedi_clear_hw_dev(struct comedi_device *dev) |
49 | { | |
50 | put_device(dev->hw_dev); | |
51 | dev->hw_dev = NULL; | |
52 | } | |
53 | ||
54db996e HS |
54 | /** |
55 | * comedi_alloc_devpriv() - Allocate memory for the device private data. | |
56 | * @dev: comedi_device struct | |
57 | * @size: size of the memory to allocate | |
58 | */ | |
59 | void *comedi_alloc_devpriv(struct comedi_device *dev, size_t size) | |
60 | { | |
61 | dev->private = kzalloc(size, GFP_KERNEL); | |
62 | return dev->private; | |
63 | } | |
64 | EXPORT_SYMBOL_GPL(comedi_alloc_devpriv); | |
65 | ||
8b9ba6e5 | 66 | int comedi_alloc_subdevices(struct comedi_device *dev, int num_subdevices) |
2f0b9d08 | 67 | { |
03afcf47 | 68 | struct comedi_subdevice *s; |
8b9ba6e5 | 69 | int i; |
2f0b9d08 | 70 | |
7f801c41 HS |
71 | if (num_subdevices < 1) |
72 | return -EINVAL; | |
03afcf47 HS |
73 | |
74 | s = kcalloc(num_subdevices, sizeof(*s), GFP_KERNEL); | |
75 | if (!s) | |
2f0b9d08 | 76 | return -ENOMEM; |
03afcf47 | 77 | dev->subdevices = s; |
fba1d0fa | 78 | dev->n_subdevices = num_subdevices; |
03afcf47 | 79 | |
2f0b9d08 | 80 | for (i = 0; i < num_subdevices; ++i) { |
5e4c58ce | 81 | s = &dev->subdevices[i]; |
03afcf47 | 82 | s->device = dev; |
90a35c15 | 83 | s->index = i; |
03afcf47 HS |
84 | s->async_dma_dir = DMA_NONE; |
85 | spin_lock_init(&s->spin_lock); | |
86 | s->minor = -1; | |
2f0b9d08 HS |
87 | } |
88 | return 0; | |
89 | } | |
90 | EXPORT_SYMBOL_GPL(comedi_alloc_subdevices); | |
91 | ||
d2762066 HS |
92 | /** |
93 | * comedi_alloc_subdev_readback() - Allocate memory for the subdevice readback. | |
94 | * @s: comedi_subdevice struct | |
95 | */ | |
96 | int comedi_alloc_subdev_readback(struct comedi_subdevice *s) | |
97 | { | |
98 | if (!s->n_chan) | |
99 | return -EINVAL; | |
100 | ||
101 | s->readback = kcalloc(s->n_chan, sizeof(*s->readback), GFP_KERNEL); | |
102 | if (!s->readback) | |
103 | return -ENOMEM; | |
aa11672e HS |
104 | |
105 | if (!s->insn_read) | |
106 | s->insn_read = comedi_readback_insn_read; | |
107 | ||
d2762066 HS |
108 | return 0; |
109 | } | |
110 | EXPORT_SYMBOL_GPL(comedi_alloc_subdev_readback); | |
111 | ||
3867e20d | 112 | static void comedi_device_detach_cleanup(struct comedi_device *dev) |
ed9eccbe DS |
113 | { |
114 | int i; | |
34c43922 | 115 | struct comedi_subdevice *s; |
ed9eccbe DS |
116 | |
117 | if (dev->subdevices) { | |
118 | for (i = 0; i < dev->n_subdevices; i++) { | |
5e4c58ce | 119 | s = &dev->subdevices[i]; |
8fc369ae | 120 | if (comedi_can_auto_free_spriv(s)) |
588ba6dc | 121 | kfree(s->private); |
ed9eccbe DS |
122 | comedi_free_subdevice_minor(s); |
123 | if (s->async) { | |
124 | comedi_buf_alloc(dev, s, 0); | |
125 | kfree(s->async); | |
126 | } | |
d2762066 | 127 | kfree(s->readback); |
ed9eccbe DS |
128 | } |
129 | kfree(dev->subdevices); | |
130 | dev->subdevices = NULL; | |
131 | dev->n_subdevices = 0; | |
132 | } | |
dedd1325 | 133 | kfree(dev->private); |
43db062a | 134 | kfree(dev->pacer); |
dedd1325 | 135 | dev->private = NULL; |
43db062a | 136 | dev->pacer = NULL; |
7029a874 | 137 | dev->driver = NULL; |
ed9eccbe DS |
138 | dev->board_name = NULL; |
139 | dev->board_ptr = NULL; | |
d7e6dc13 | 140 | dev->mmio = NULL; |
ed9eccbe | 141 | dev->iobase = 0; |
316f97f1 | 142 | dev->iolen = 0; |
00ca6884 | 143 | dev->ioenabled = false; |
ed9eccbe DS |
144 | dev->irq = 0; |
145 | dev->read_subdev = NULL; | |
146 | dev->write_subdev = NULL; | |
147 | dev->open = NULL; | |
148 | dev->close = NULL; | |
de06d7c6 | 149 | comedi_clear_hw_dev(dev); |
ed9eccbe DS |
150 | } |
151 | ||
016599f5 | 152 | void comedi_device_detach(struct comedi_device *dev) |
ed9eccbe | 153 | { |
d19db51a | 154 | comedi_device_cancel_all(dev); |
bf11c134 | 155 | down_write(&dev->attach_lock); |
a7401cdd | 156 | dev->attached = false; |
ef77c0b2 | 157 | dev->detach_count++; |
5617f9da | 158 | if (dev->driver) |
ed9eccbe | 159 | dev->driver->detach(dev); |
3867e20d | 160 | comedi_device_detach_cleanup(dev); |
bf11c134 | 161 | up_write(&dev->attach_lock); |
ed9eccbe DS |
162 | } |
163 | ||
01fca378 | 164 | static int poll_invalid(struct comedi_device *dev, struct comedi_subdevice *s) |
ed9eccbe | 165 | { |
01fca378 | 166 | return -EINVAL; |
ed9eccbe DS |
167 | } |
168 | ||
01fca378 HS |
169 | int insn_inval(struct comedi_device *dev, struct comedi_subdevice *s, |
170 | struct comedi_insn *insn, unsigned int *data) | |
ed9eccbe | 171 | { |
01fca378 | 172 | return -EINVAL; |
ed9eccbe DS |
173 | } |
174 | ||
d2762066 HS |
175 | /** |
176 | * comedi_readback_insn_read() - A generic (*insn_read) for subdevice readback. | |
177 | * @dev: comedi_device struct | |
178 | * @s: comedi_subdevice struct | |
179 | * @insn: comedi_insn struct | |
180 | * @data: pointer to return the readback data | |
181 | */ | |
182 | int comedi_readback_insn_read(struct comedi_device *dev, | |
183 | struct comedi_subdevice *s, | |
184 | struct comedi_insn *insn, | |
185 | unsigned int *data) | |
186 | { | |
187 | unsigned int chan = CR_CHAN(insn->chanspec); | |
188 | int i; | |
189 | ||
190 | if (!s->readback) | |
191 | return -EINVAL; | |
192 | ||
193 | for (i = 0; i < insn->n; i++) | |
194 | data[i] = s->readback[chan]; | |
195 | ||
196 | return insn->n; | |
197 | } | |
198 | EXPORT_SYMBOL_GPL(comedi_readback_insn_read); | |
199 | ||
91506408 HS |
200 | /** |
201 | * comedi_timeout() - busy-wait for a driver condition to occur. | |
202 | * @dev: comedi_device struct | |
203 | * @s: comedi_subdevice struct | |
204 | * @insn: comedi_insn struct | |
205 | * @cb: callback to check for the condition | |
206 | * @context: private context from the driver | |
207 | */ | |
208 | int comedi_timeout(struct comedi_device *dev, | |
209 | struct comedi_subdevice *s, | |
210 | struct comedi_insn *insn, | |
211 | int (*cb)(struct comedi_device *dev, | |
212 | struct comedi_subdevice *s, | |
213 | struct comedi_insn *insn, | |
214 | unsigned long context), | |
215 | unsigned long context) | |
216 | { | |
217 | unsigned long timeout = jiffies + msecs_to_jiffies(COMEDI_TIMEOUT_MS); | |
218 | int ret; | |
219 | ||
220 | while (time_before(jiffies, timeout)) { | |
221 | ret = cb(dev, s, insn, context); | |
222 | if (ret != -EBUSY) | |
223 | return ret; /* success (0) or non EBUSY errno */ | |
224 | cpu_relax(); | |
225 | } | |
226 | return -ETIMEDOUT; | |
227 | } | |
228 | EXPORT_SYMBOL_GPL(comedi_timeout); | |
229 | ||
e523c6c8 HS |
230 | /** |
231 | * comedi_dio_insn_config() - boilerplate (*insn_config) for DIO subdevices. | |
232 | * @dev: comedi_device struct | |
233 | * @s: comedi_subdevice struct | |
234 | * @insn: comedi_insn struct | |
235 | * @data: parameters for the @insn | |
236 | * @mask: io_bits mask for grouped channels | |
237 | */ | |
238 | int comedi_dio_insn_config(struct comedi_device *dev, | |
239 | struct comedi_subdevice *s, | |
240 | struct comedi_insn *insn, | |
241 | unsigned int *data, | |
242 | unsigned int mask) | |
243 | { | |
244 | unsigned int chan_mask = 1 << CR_CHAN(insn->chanspec); | |
245 | ||
246 | if (!mask) | |
247 | mask = chan_mask; | |
248 | ||
249 | switch (data[0]) { | |
250 | case INSN_CONFIG_DIO_INPUT: | |
251 | s->io_bits &= ~mask; | |
252 | break; | |
253 | ||
254 | case INSN_CONFIG_DIO_OUTPUT: | |
255 | s->io_bits |= mask; | |
256 | break; | |
257 | ||
258 | case INSN_CONFIG_DIO_QUERY: | |
259 | data[1] = (s->io_bits & mask) ? COMEDI_OUTPUT : COMEDI_INPUT; | |
260 | return insn->n; | |
261 | ||
262 | default: | |
263 | return -EINVAL; | |
264 | } | |
265 | ||
266 | return 0; | |
267 | } | |
268 | EXPORT_SYMBOL_GPL(comedi_dio_insn_config); | |
269 | ||
05e60b13 HS |
270 | /** |
271 | * comedi_dio_update_state() - update the internal state of DIO subdevices. | |
272 | * @s: comedi_subdevice struct | |
273 | * @data: the channel mask and bits to update | |
274 | */ | |
275 | unsigned int comedi_dio_update_state(struct comedi_subdevice *s, | |
276 | unsigned int *data) | |
277 | { | |
278 | unsigned int chanmask = (s->n_chan < 32) ? ((1 << s->n_chan) - 1) | |
279 | : 0xffffffff; | |
280 | unsigned int mask = data[0] & chanmask; | |
281 | unsigned int bits = data[1]; | |
282 | ||
283 | if (mask) { | |
284 | s->state &= ~mask; | |
285 | s->state |= (bits & mask); | |
286 | } | |
287 | ||
288 | return mask; | |
289 | } | |
290 | EXPORT_SYMBOL_GPL(comedi_dio_update_state); | |
291 | ||
f146fe63 IA |
292 | /** |
293 | * comedi_bytes_per_scan - get length of asynchronous command "scan" in bytes | |
294 | * @s: comedi_subdevice struct | |
295 | * | |
296 | * Determines the overall scan length according to the subdevice type and the | |
297 | * number of channels in the scan. | |
298 | * | |
299 | * For digital input, output or input/output subdevices, samples for multiple | |
300 | * channels are assumed to be packed into one or more unsigned short or | |
301 | * unsigned int values according to the subdevice's SDF_LSAMPL flag. For other | |
302 | * types of subdevice, samples are assumed to occupy a whole unsigned short or | |
303 | * unsigned int according to the SDF_LSAMPL flag. | |
304 | * | |
305 | * Returns the overall scan length in bytes. | |
306 | */ | |
307 | unsigned int comedi_bytes_per_scan(struct comedi_subdevice *s) | |
308 | { | |
309 | struct comedi_cmd *cmd = &s->async->cmd; | |
310 | unsigned int num_samples; | |
311 | unsigned int bits_per_sample; | |
312 | ||
313 | switch (s->type) { | |
314 | case COMEDI_SUBD_DI: | |
315 | case COMEDI_SUBD_DO: | |
316 | case COMEDI_SUBD_DIO: | |
c39e050d | 317 | bits_per_sample = 8 * comedi_bytes_per_sample(s); |
af57d89e | 318 | num_samples = DIV_ROUND_UP(cmd->scan_end_arg, bits_per_sample); |
f146fe63 IA |
319 | break; |
320 | default: | |
af57d89e | 321 | num_samples = cmd->scan_end_arg; |
f146fe63 IA |
322 | break; |
323 | } | |
c39e050d | 324 | return comedi_samples_to_bytes(s, num_samples); |
f146fe63 IA |
325 | } |
326 | EXPORT_SYMBOL_GPL(comedi_bytes_per_scan); | |
327 | ||
2ee37750 HS |
328 | /** |
329 | * comedi_nscans_left - return the number of scans left in the command | |
330 | * @s: comedi_subdevice struct | |
331 | * @nscans: the expected number of scans | |
332 | * | |
333 | * If nscans is 0, the number of scans available in the async buffer will be | |
334 | * used. Otherwise the expected number of scans will be used. | |
335 | * | |
336 | * If the async command has a stop_src of TRIG_COUNT, the nscans will be | |
337 | * checked against the number of scans left in the command. | |
338 | * | |
339 | * The return value will then be either the expected number of scans or the | |
340 | * number of scans remaining in the command. | |
341 | */ | |
342 | unsigned int comedi_nscans_left(struct comedi_subdevice *s, | |
343 | unsigned int nscans) | |
344 | { | |
345 | struct comedi_async *async = s->async; | |
346 | struct comedi_cmd *cmd = &async->cmd; | |
347 | ||
348 | if (nscans == 0) { | |
349 | unsigned int nbytes = comedi_buf_read_n_available(s); | |
350 | ||
351 | nscans = nbytes / comedi_bytes_per_scan(s); | |
352 | } | |
353 | ||
354 | if (cmd->stop_src == TRIG_COUNT) { | |
355 | unsigned int scans_left = 0; | |
356 | ||
357 | if (async->scans_done < cmd->stop_arg) | |
358 | scans_left = cmd->stop_arg - async->scans_done; | |
359 | ||
360 | if (nscans > scans_left) | |
361 | nscans = scans_left; | |
362 | } | |
363 | return nscans; | |
364 | } | |
365 | EXPORT_SYMBOL_GPL(comedi_nscans_left); | |
366 | ||
f615915e HS |
367 | /** |
368 | * comedi_nsamples_left - return the number of samples left in the command | |
369 | * @s: comedi_subdevice struct | |
370 | * @nsamples: the expected number of samples | |
371 | * | |
372 | * Returns the expected number of samples of the number of samples remaining | |
373 | * in the command. | |
374 | */ | |
375 | unsigned int comedi_nsamples_left(struct comedi_subdevice *s, | |
376 | unsigned int nsamples) | |
377 | { | |
378 | struct comedi_async *async = s->async; | |
379 | struct comedi_cmd *cmd = &async->cmd; | |
380 | ||
381 | if (cmd->stop_src == TRIG_COUNT) { | |
382 | /* +1 to force comedi_nscans_left() to return the scans left */ | |
383 | unsigned int nscans = (nsamples / cmd->scan_end_arg) + 1; | |
384 | unsigned int scans_left = comedi_nscans_left(s, nscans); | |
af57d89e IA |
385 | unsigned int scan_pos = |
386 | comedi_bytes_to_samples(s, async->scan_progress); | |
f615915e HS |
387 | unsigned long long samples_left = 0; |
388 | ||
389 | if (scans_left) { | |
390 | samples_left = ((unsigned long long)scans_left * | |
af57d89e | 391 | cmd->scan_end_arg) - scan_pos; |
f615915e HS |
392 | } |
393 | ||
394 | if (samples_left < nsamples) | |
395 | nsamples = samples_left; | |
396 | } | |
397 | return nsamples; | |
398 | } | |
399 | EXPORT_SYMBOL_GPL(comedi_nsamples_left); | |
400 | ||
2b4e1f63 IA |
401 | /** |
402 | * comedi_inc_scan_progress - update scan progress in asynchronous command | |
403 | * @s: comedi_subdevice struct | |
404 | * @num_bytes: amount of data in bytes to increment scan progress | |
405 | * | |
406 | * Increments the scan progress by the number of bytes specified by num_bytes. | |
407 | * If the scan progress reaches or exceeds the scan length in bytes, reduce | |
408 | * it modulo the scan length in bytes and set the "end of scan" asynchronous | |
409 | * event flag to be processed later. | |
410 | */ | |
411 | void comedi_inc_scan_progress(struct comedi_subdevice *s, | |
412 | unsigned int num_bytes) | |
413 | { | |
414 | struct comedi_async *async = s->async; | |
f8736ca4 | 415 | struct comedi_cmd *cmd = &async->cmd; |
2b4e1f63 IA |
416 | unsigned int scan_length = comedi_bytes_per_scan(s); |
417 | ||
f8736ca4 HS |
418 | /* track the 'cur_chan' for non-SDF_PACKED subdevices */ |
419 | if (!(s->subdev_flags & SDF_PACKED)) { | |
420 | async->cur_chan += comedi_bytes_to_samples(s, num_bytes); | |
421 | async->cur_chan %= cmd->chanlist_len; | |
422 | } | |
423 | ||
2b4e1f63 IA |
424 | async->scan_progress += num_bytes; |
425 | if (async->scan_progress >= scan_length) { | |
1dacbe5b HS |
426 | unsigned int nscans = async->scan_progress / scan_length; |
427 | ||
428 | if (async->scans_done < (UINT_MAX - nscans)) | |
429 | async->scans_done += nscans; | |
430 | else | |
431 | async->scans_done = UINT_MAX; | |
432 | ||
2b4e1f63 IA |
433 | async->scan_progress %= scan_length; |
434 | async->events |= COMEDI_CB_EOS; | |
435 | } | |
436 | } | |
437 | EXPORT_SYMBOL_GPL(comedi_inc_scan_progress); | |
438 | ||
5a780359 IA |
439 | /** |
440 | * comedi_handle_events - handle events and possibly stop acquisition | |
441 | * @dev: comedi_device struct | |
442 | * @s: comedi_subdevice struct | |
443 | * | |
444 | * Handles outstanding asynchronous acquisition event flags associated | |
445 | * with the subdevice. Call the subdevice's "->cancel()" handler if the | |
446 | * "end of acquisition", "error" or "overflow" event flags are set in order | |
447 | * to stop the acquisition at the driver level. | |
448 | * | |
449 | * Calls comedi_event() to further process the event flags, which may mark | |
450 | * the asynchronous command as no longer running, possibly terminated with | |
451 | * an error, and may wake up tasks. | |
452 | * | |
453 | * Return a bit-mask of the handled events. | |
454 | */ | |
455 | unsigned int comedi_handle_events(struct comedi_device *dev, | |
456 | struct comedi_subdevice *s) | |
457 | { | |
458 | unsigned int events = s->async->events; | |
459 | ||
460 | if (events == 0) | |
461 | return events; | |
462 | ||
781f933c | 463 | if (events & COMEDI_CB_CANCEL_MASK) |
5a780359 IA |
464 | s->cancel(dev, s); |
465 | ||
466 | comedi_event(dev, s); | |
467 | ||
468 | return events; | |
469 | } | |
470 | EXPORT_SYMBOL_GPL(comedi_handle_events); | |
471 | ||
01fca378 HS |
472 | static int insn_rw_emulate_bits(struct comedi_device *dev, |
473 | struct comedi_subdevice *s, | |
474 | struct comedi_insn *insn, unsigned int *data) | |
ed9eccbe | 475 | { |
01fca378 HS |
476 | struct comedi_insn new_insn; |
477 | int ret; | |
478 | static const unsigned channels_per_bitfield = 32; | |
ed9eccbe | 479 | |
01fca378 HS |
480 | unsigned chan = CR_CHAN(insn->chanspec); |
481 | const unsigned base_bitfield_channel = | |
482 | (chan < channels_per_bitfield) ? 0 : chan; | |
483 | unsigned int new_data[2]; | |
1e4742df | 484 | |
01fca378 HS |
485 | memset(new_data, 0, sizeof(new_data)); |
486 | memset(&new_insn, 0, sizeof(new_insn)); | |
487 | new_insn.insn = INSN_BITS; | |
488 | new_insn.chanspec = base_bitfield_channel; | |
489 | new_insn.n = 2; | |
490 | new_insn.subdev = insn->subdev; | |
ed9eccbe | 491 | |
01fca378 HS |
492 | if (insn->insn == INSN_WRITE) { |
493 | if (!(s->subdev_flags & SDF_WRITABLE)) | |
494 | return -EINVAL; | |
495 | new_data[0] = 1 << (chan - base_bitfield_channel); /* mask */ | |
496 | new_data[1] = data[0] ? (1 << (chan - base_bitfield_channel)) | |
497 | : 0; /* bits */ | |
ed9eccbe DS |
498 | } |
499 | ||
01fca378 HS |
500 | ret = s->insn_bits(dev, s, &new_insn, new_data); |
501 | if (ret < 0) | |
502 | return ret; | |
ed9eccbe | 503 | |
01fca378 HS |
504 | if (insn->insn == INSN_READ) |
505 | data[0] = (new_data[1] >> (chan - base_bitfield_channel)) & 1; | |
506 | ||
507 | return 1; | |
ed9eccbe DS |
508 | } |
509 | ||
40f58a65 HS |
510 | static int __comedi_device_postconfig_async(struct comedi_device *dev, |
511 | struct comedi_subdevice *s) | |
512 | { | |
513 | struct comedi_async *async; | |
514 | unsigned int buf_size; | |
515 | int ret; | |
516 | ||
57b71c3e HS |
517 | if ((s->subdev_flags & (SDF_CMD_READ | SDF_CMD_WRITE)) == 0) { |
518 | dev_warn(dev->class_dev, | |
519 | "async subdevices must support SDF_CMD_READ or SDF_CMD_WRITE\n"); | |
520 | return -EINVAL; | |
521 | } | |
522 | if (!s->do_cmdtest) { | |
523 | dev_warn(dev->class_dev, | |
524 | "async subdevices must have a do_cmdtest() function\n"); | |
525 | return -EINVAL; | |
526 | } | |
40f58a65 HS |
527 | |
528 | async = kzalloc(sizeof(*async), GFP_KERNEL); | |
78110bb8 | 529 | if (!async) |
40f58a65 | 530 | return -ENOMEM; |
78110bb8 | 531 | |
40f58a65 | 532 | init_waitqueue_head(&async->wait_head); |
40f58a65 HS |
533 | s->async = async; |
534 | ||
535 | async->max_bufsize = comedi_default_buf_maxsize_kb * 1024; | |
536 | buf_size = comedi_default_buf_size_kb * 1024; | |
537 | if (buf_size > async->max_bufsize) | |
538 | buf_size = async->max_bufsize; | |
539 | ||
540 | if (comedi_buf_alloc(dev, s, buf_size) < 0) { | |
541 | dev_warn(dev->class_dev, "Buffer allocation failed\n"); | |
542 | return -ENOMEM; | |
543 | } | |
544 | if (s->buf_change) { | |
d546b896 | 545 | ret = s->buf_change(dev, s); |
40f58a65 HS |
546 | if (ret < 0) |
547 | return ret; | |
548 | } | |
549 | ||
f65cc544 | 550 | comedi_alloc_subdevice_minor(s); |
40f58a65 HS |
551 | |
552 | return 0; | |
553 | } | |
554 | ||
555 | static int __comedi_device_postconfig(struct comedi_device *dev) | |
ed9eccbe | 556 | { |
34c43922 | 557 | struct comedi_subdevice *s; |
ed9eccbe | 558 | int ret; |
40f58a65 | 559 | int i; |
ed9eccbe DS |
560 | |
561 | for (i = 0; i < dev->n_subdevices; i++) { | |
5e4c58ce | 562 | s = &dev->subdevices[i]; |
ed9eccbe DS |
563 | |
564 | if (s->type == COMEDI_SUBD_UNUSED) | |
565 | continue; | |
566 | ||
09567cb4 HS |
567 | if (s->type == COMEDI_SUBD_DO) { |
568 | if (s->n_chan < 32) | |
569 | s->io_bits = (1 << s->n_chan) - 1; | |
570 | else | |
571 | s->io_bits = 0xffffffff; | |
572 | } | |
573 | ||
ed9eccbe DS |
574 | if (s->len_chanlist == 0) |
575 | s->len_chanlist = 1; | |
576 | ||
577 | if (s->do_cmd) { | |
40f58a65 HS |
578 | ret = __comedi_device_postconfig_async(dev, s); |
579 | if (ret) | |
580 | return ret; | |
ed9eccbe DS |
581 | } |
582 | ||
583 | if (!s->range_table && !s->range_table_list) | |
584 | s->range_table = &range_unknown; | |
585 | ||
586 | if (!s->insn_read && s->insn_bits) | |
587 | s->insn_read = insn_rw_emulate_bits; | |
588 | if (!s->insn_write && s->insn_bits) | |
589 | s->insn_write = insn_rw_emulate_bits; | |
590 | ||
591 | if (!s->insn_read) | |
592 | s->insn_read = insn_inval; | |
593 | if (!s->insn_write) | |
594 | s->insn_write = insn_inval; | |
595 | if (!s->insn_bits) | |
596 | s->insn_bits = insn_inval; | |
597 | if (!s->insn_config) | |
598 | s->insn_config = insn_inval; | |
599 | ||
600 | if (!s->poll) | |
601 | s->poll = poll_invalid; | |
602 | } | |
603 | ||
604 | return 0; | |
605 | } | |
606 | ||
01fca378 | 607 | /* do a little post-config cleanup */ |
01fca378 HS |
608 | static int comedi_device_postconfig(struct comedi_device *dev) |
609 | { | |
b2a644b4 IA |
610 | int ret; |
611 | ||
612 | ret = __comedi_device_postconfig(dev); | |
ae5dd5fc | 613 | if (ret < 0) |
01fca378 | 614 | return ret; |
bf11c134 | 615 | down_write(&dev->attach_lock); |
a7401cdd | 616 | dev->attached = true; |
bf11c134 | 617 | up_write(&dev->attach_lock); |
01fca378 HS |
618 | return 0; |
619 | } | |
620 | ||
4e2f002f IA |
621 | /* |
622 | * Generic recognize function for drivers that register their supported | |
623 | * board names. | |
624 | * | |
625 | * 'driv->board_name' points to a 'const char *' member within the | |
626 | * zeroth element of an array of some private board information | |
627 | * structure, say 'struct foo_board' containing a member 'const char | |
628 | * *board_name' that is initialized to point to a board name string that | |
629 | * is one of the candidates matched against this function's 'name' | |
630 | * parameter. | |
631 | * | |
632 | * 'driv->offset' is the size of the private board information | |
633 | * structure, say 'sizeof(struct foo_board)', and 'driv->num_names' is | |
634 | * the length of the array of private board information structures. | |
635 | * | |
636 | * If one of the board names in the array of private board information | |
637 | * structures matches the name supplied to this function, the function | |
638 | * returns a pointer to the pointer to the board name, otherwise it | |
639 | * returns NULL. The return value ends up in the 'board_ptr' member of | |
640 | * a 'struct comedi_device' that the low-level comedi driver's | |
641 | * 'attach()' hook can convert to a point to a particular element of its | |
642 | * array of private board information structures by subtracting the | |
643 | * offset of the member that points to the board name. (No subtraction | |
644 | * is required if the board name pointer is the first member of the | |
645 | * private board information structure, which is generally the case.) | |
646 | */ | |
7029a874 | 647 | static void *comedi_recognize(struct comedi_driver *driv, const char *name) |
ed9eccbe | 648 | { |
1c9de58a DC |
649 | char **name_ptr = (char **)driv->board_name; |
650 | int i; | |
651 | ||
ed9eccbe DS |
652 | for (i = 0; i < driv->num_names; i++) { |
653 | if (strcmp(*name_ptr, name) == 0) | |
1c9de58a DC |
654 | return name_ptr; |
655 | name_ptr = (void *)name_ptr + driv->offset; | |
ed9eccbe DS |
656 | } |
657 | ||
658 | return NULL; | |
659 | } | |
660 | ||
7029a874 | 661 | static void comedi_report_boards(struct comedi_driver *driv) |
ed9eccbe DS |
662 | { |
663 | unsigned int i; | |
664 | const char *const *name_ptr; | |
665 | ||
4f870fe6 IA |
666 | pr_info("comedi: valid board names for %s driver are:\n", |
667 | driv->driver_name); | |
ed9eccbe DS |
668 | |
669 | name_ptr = driv->board_name; | |
670 | for (i = 0; i < driv->num_names; i++) { | |
4f870fe6 | 671 | pr_info(" %s\n", *name_ptr); |
ed9eccbe DS |
672 | name_ptr = (const char **)((char *)name_ptr + driv->offset); |
673 | } | |
674 | ||
675 | if (driv->num_names == 0) | |
4f870fe6 | 676 | pr_info(" %s\n", driv->driver_name); |
ed9eccbe DS |
677 | } |
678 | ||
9ff8b151 HS |
679 | /** |
680 | * comedi_load_firmware() - Request and load firmware for a device. | |
681 | * @dev: comedi_device struct | |
682 | * @hw_device: device struct for the comedi_device | |
683 | * @name: the name of the firmware image | |
684 | * @cb: callback to the upload the firmware image | |
d569541e | 685 | * @context: private context from the driver |
9ff8b151 HS |
686 | */ |
687 | int comedi_load_firmware(struct comedi_device *dev, | |
688 | struct device *device, | |
689 | const char *name, | |
690 | int (*cb)(struct comedi_device *dev, | |
d569541e HS |
691 | const u8 *data, size_t size, |
692 | unsigned long context), | |
693 | unsigned long context) | |
9ff8b151 HS |
694 | { |
695 | const struct firmware *fw; | |
696 | int ret; | |
697 | ||
698 | if (!cb) | |
699 | return -EINVAL; | |
700 | ||
701 | ret = request_firmware(&fw, name, device); | |
702 | if (ret == 0) { | |
d569541e | 703 | ret = cb(dev, fw->data, fw->size, context); |
9ff8b151 HS |
704 | release_firmware(fw); |
705 | } | |
706 | ||
c6236c0c | 707 | return ret < 0 ? ret : 0; |
9ff8b151 HS |
708 | } |
709 | EXPORT_SYMBOL_GPL(comedi_load_firmware); | |
710 | ||
f375ac5f | 711 | /** |
ca8b2964 | 712 | * __comedi_request_region() - Request an I/O reqion for a legacy driver. |
f375ac5f HS |
713 | * @dev: comedi_device struct |
714 | * @start: base address of the I/O reqion | |
715 | * @len: length of the I/O region | |
716 | */ | |
ca8b2964 HS |
717 | int __comedi_request_region(struct comedi_device *dev, |
718 | unsigned long start, unsigned long len) | |
f375ac5f HS |
719 | { |
720 | if (!start) { | |
721 | dev_warn(dev->class_dev, | |
722 | "%s: a I/O base address must be specified\n", | |
723 | dev->board_name); | |
724 | return -EINVAL; | |
725 | } | |
726 | ||
727 | if (!request_region(start, len, dev->board_name)) { | |
728 | dev_warn(dev->class_dev, "%s: I/O port conflict (%#lx,%lu)\n", | |
729 | dev->board_name, start, len); | |
730 | return -EIO; | |
731 | } | |
f375ac5f HS |
732 | |
733 | return 0; | |
734 | } | |
ca8b2964 HS |
735 | EXPORT_SYMBOL_GPL(__comedi_request_region); |
736 | ||
737 | /** | |
738 | * comedi_request_region() - Request an I/O reqion for a legacy driver. | |
739 | * @dev: comedi_device struct | |
740 | * @start: base address of the I/O reqion | |
741 | * @len: length of the I/O region | |
742 | */ | |
743 | int comedi_request_region(struct comedi_device *dev, | |
744 | unsigned long start, unsigned long len) | |
745 | { | |
746 | int ret; | |
747 | ||
748 | ret = __comedi_request_region(dev, start, len); | |
316f97f1 | 749 | if (ret == 0) { |
ca8b2964 | 750 | dev->iobase = start; |
316f97f1 HS |
751 | dev->iolen = len; |
752 | } | |
ca8b2964 HS |
753 | |
754 | return ret; | |
755 | } | |
f375ac5f HS |
756 | EXPORT_SYMBOL_GPL(comedi_request_region); |
757 | ||
316f97f1 HS |
758 | /** |
759 | * comedi_legacy_detach() - A generic (*detach) function for legacy drivers. | |
760 | * @dev: comedi_device struct | |
761 | */ | |
762 | void comedi_legacy_detach(struct comedi_device *dev) | |
763 | { | |
3d1fe3f7 HS |
764 | if (dev->irq) { |
765 | free_irq(dev->irq, dev); | |
766 | dev->irq = 0; | |
767 | } | |
316f97f1 HS |
768 | if (dev->iobase && dev->iolen) { |
769 | release_region(dev->iobase, dev->iolen); | |
770 | dev->iobase = 0; | |
771 | dev->iolen = 0; | |
772 | } | |
773 | } | |
774 | EXPORT_SYMBOL_GPL(comedi_legacy_detach); | |
775 | ||
01fca378 | 776 | int comedi_device_attach(struct comedi_device *dev, struct comedi_devconfig *it) |
ed9eccbe | 777 | { |
01fca378 HS |
778 | struct comedi_driver *driv; |
779 | int ret; | |
780 | ||
781 | if (dev->attached) | |
782 | return -EBUSY; | |
783 | ||
c383e2d6 | 784 | mutex_lock(&comedi_drivers_list_lock); |
01fca378 HS |
785 | for (driv = comedi_drivers; driv; driv = driv->next) { |
786 | if (!try_module_get(driv->module)) | |
787 | continue; | |
788 | if (driv->num_names) { | |
789 | dev->board_ptr = comedi_recognize(driv, it->board_name); | |
790 | if (dev->board_ptr) | |
791 | break; | |
3df9f21a | 792 | } else if (strcmp(driv->driver_name, it->board_name) == 0) { |
01fca378 | 793 | break; |
3df9f21a | 794 | } |
01fca378 HS |
795 | module_put(driv->module); |
796 | } | |
e2850160 | 797 | if (!driv) { |
01fca378 HS |
798 | /* recognize has failed if we get here */ |
799 | /* report valid board names before returning error */ | |
800 | for (driv = comedi_drivers; driv; driv = driv->next) { | |
801 | if (!try_module_get(driv->module)) | |
802 | continue; | |
803 | comedi_report_boards(driv); | |
804 | module_put(driv->module); | |
805 | } | |
c383e2d6 IA |
806 | ret = -EIO; |
807 | goto out; | |
01fca378 | 808 | } |
e2850160 | 809 | if (!driv->attach) { |
01fca378 HS |
810 | /* driver does not support manual configuration */ |
811 | dev_warn(dev->class_dev, | |
812 | "driver '%s' does not support attach using comedi_config\n", | |
813 | driv->driver_name); | |
814 | module_put(driv->module); | |
1a59adb2 | 815 | ret = -EIO; |
c383e2d6 | 816 | goto out; |
01fca378 | 817 | } |
01fca378 | 818 | dev->driver = driv; |
34b68400 HS |
819 | dev->board_name = dev->board_ptr ? *(const char **)dev->board_ptr |
820 | : dev->driver->driver_name; | |
01fca378 | 821 | ret = driv->attach(dev, it); |
74ece108 IA |
822 | if (ret >= 0) |
823 | ret = comedi_device_postconfig(dev); | |
01fca378 | 824 | if (ret < 0) { |
016599f5 | 825 | comedi_device_detach(dev); |
3955dfa8 | 826 | module_put(driv->module); |
01fca378 | 827 | } |
b2a644b4 | 828 | /* On success, the driver module count has been incremented. */ |
c383e2d6 IA |
829 | out: |
830 | mutex_unlock(&comedi_drivers_list_lock); | |
b2a644b4 | 831 | return ret; |
ed9eccbe DS |
832 | } |
833 | ||
a588da1d IA |
834 | int comedi_auto_config(struct device *hardware_device, |
835 | struct comedi_driver *driver, unsigned long context) | |
f4011670 | 836 | { |
6013a9a5 | 837 | struct comedi_device *dev; |
f4011670 IA |
838 | int ret; |
839 | ||
f08e0ac5 IA |
840 | if (!hardware_device) { |
841 | pr_warn("BUG! comedi_auto_config called with NULL hardware_device\n"); | |
842 | return -EINVAL; | |
843 | } | |
844 | if (!driver) { | |
845 | dev_warn(hardware_device, | |
846 | "BUG! comedi_auto_config called with NULL comedi driver\n"); | |
847 | return -EINVAL; | |
848 | } | |
849 | ||
a588da1d IA |
850 | if (!driver->auto_attach) { |
851 | dev_warn(hardware_device, | |
852 | "BUG! comedi driver '%s' has no auto_attach handler\n", | |
853 | driver->driver_name); | |
854 | return -EINVAL; | |
855 | } | |
856 | ||
6013a9a5 | 857 | dev = comedi_alloc_board_minor(hardware_device); |
bcb6232d BP |
858 | if (IS_ERR(dev)) { |
859 | dev_warn(hardware_device, | |
860 | "driver '%s' could not create device.\n", | |
861 | driver->driver_name); | |
6013a9a5 | 862 | return PTR_ERR(dev); |
bcb6232d | 863 | } |
6013a9a5 | 864 | /* Note: comedi_alloc_board_minor() locked dev->mutex. */ |
f4011670 | 865 | |
6013a9a5 | 866 | dev->driver = driver; |
34b68400 | 867 | dev->board_name = dev->driver->driver_name; |
6013a9a5 | 868 | ret = driver->auto_attach(dev, context); |
74ece108 | 869 | if (ret >= 0) |
6013a9a5 | 870 | ret = comedi_device_postconfig(dev); |
6013a9a5 | 871 | mutex_unlock(&dev->mutex); |
f4011670 | 872 | |
bcb6232d BP |
873 | if (ret < 0) { |
874 | dev_warn(hardware_device, | |
875 | "driver '%s' failed to auto-configure device.\n", | |
876 | driver->driver_name); | |
f5b31e15 | 877 | comedi_release_hardware_device(hardware_device); |
bcb6232d BP |
878 | } else { |
879 | /* | |
880 | * class_dev should be set properly here | |
881 | * after a successful auto config | |
882 | */ | |
883 | dev_info(dev->class_dev, | |
884 | "driver '%s' has successfully auto-configured '%s'.\n", | |
885 | driver->driver_name, dev->board_name); | |
886 | } | |
f4011670 IA |
887 | return ret; |
888 | } | |
8ed705af IA |
889 | EXPORT_SYMBOL_GPL(comedi_auto_config); |
890 | ||
891 | void comedi_auto_unconfig(struct device *hardware_device) | |
ed9eccbe | 892 | { |
e2850160 | 893 | if (!hardware_device) |
c43435d7 | 894 | return; |
3346b798 | 895 | comedi_release_hardware_device(hardware_device); |
ed9eccbe | 896 | } |
8ed705af | 897 | EXPORT_SYMBOL_GPL(comedi_auto_unconfig); |
1ae6b20b HS |
898 | |
899 | int comedi_driver_register(struct comedi_driver *driver) | |
900 | { | |
c383e2d6 | 901 | mutex_lock(&comedi_drivers_list_lock); |
1ae6b20b HS |
902 | driver->next = comedi_drivers; |
903 | comedi_drivers = driver; | |
c383e2d6 | 904 | mutex_unlock(&comedi_drivers_list_lock); |
1ae6b20b HS |
905 | |
906 | return 0; | |
907 | } | |
5660e742 | 908 | EXPORT_SYMBOL_GPL(comedi_driver_register); |
1ae6b20b | 909 | |
99c0e269 | 910 | void comedi_driver_unregister(struct comedi_driver *driver) |
1ae6b20b HS |
911 | { |
912 | struct comedi_driver *prev; | |
913 | int i; | |
914 | ||
c383e2d6 IA |
915 | /* unlink the driver */ |
916 | mutex_lock(&comedi_drivers_list_lock); | |
917 | if (comedi_drivers == driver) { | |
918 | comedi_drivers = driver->next; | |
919 | } else { | |
920 | for (prev = comedi_drivers; prev->next; prev = prev->next) { | |
921 | if (prev->next == driver) { | |
922 | prev->next = driver->next; | |
923 | break; | |
924 | } | |
925 | } | |
926 | } | |
927 | mutex_unlock(&comedi_drivers_list_lock); | |
928 | ||
1ae6b20b HS |
929 | /* check for devices using this driver */ |
930 | for (i = 0; i < COMEDI_NUM_BOARD_MINORS; i++) { | |
a200fadc | 931 | struct comedi_device *dev = comedi_dev_get_from_minor(i); |
1ae6b20b HS |
932 | |
933 | if (!dev) | |
934 | continue; | |
935 | ||
936 | mutex_lock(&dev->mutex); | |
937 | if (dev->attached && dev->driver == driver) { | |
938 | if (dev->use_count) | |
939 | dev_warn(dev->class_dev, | |
940 | "BUG! detaching device with use_count=%d\n", | |
941 | dev->use_count); | |
942 | comedi_device_detach(dev); | |
943 | } | |
944 | mutex_unlock(&dev->mutex); | |
a200fadc | 945 | comedi_dev_put(dev); |
1ae6b20b | 946 | } |
1ae6b20b | 947 | } |
5660e742 | 948 | EXPORT_SYMBOL_GPL(comedi_driver_unregister); |