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Commit | Line | Data |
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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. | |
37a7029b | 18 | */ |
ed9eccbe | 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> |
d35d8939 | 26 | #include <linux/dma-direction.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 | |
9b34845e IA |
37 | /** |
38 | * comedi_set_hw_dev() - Set hardware device associated with COMEDI device | |
39 | * @dev: COMEDI device. | |
40 | * @hw_dev: Hardware device. | |
41 | * | |
42 | * For automatically configured COMEDI devices (resulting from a call to | |
43 | * comedi_auto_config() or one of its wrappers from the low-level COMEDI | |
44 | * driver), comedi_set_hw_dev() is called automatically by the COMEDI core | |
45 | * to associate the COMEDI device with the hardware device. It can also be | |
46 | * called directly by "legacy" low-level COMEDI drivers that rely on the | |
47 | * %COMEDI_DEVCONFIG ioctl to configure the hardware as long as the hardware | |
48 | * has a &struct device. | |
49 | * | |
50 | * If @dev->hw_dev is NULL, it gets a reference to @hw_dev and sets | |
51 | * @dev->hw_dev, otherwise, it does nothing. Calling it multiple times | |
52 | * with the same hardware device is not considered an error. If it gets | |
53 | * a reference to the hardware device, it will be automatically 'put' when | |
54 | * the device is detached from COMEDI. | |
55 | * | |
56 | * Returns 0 if @dev->hw_dev was NULL or the same as @hw_dev, otherwise | |
57 | * returns -EEXIST. | |
58 | */ | |
da717511 IA |
59 | int comedi_set_hw_dev(struct comedi_device *dev, struct device *hw_dev) |
60 | { | |
de06d7c6 IA |
61 | if (hw_dev == dev->hw_dev) |
62 | return 0; | |
e2850160 | 63 | if (dev->hw_dev) |
de06d7c6 | 64 | return -EEXIST; |
da717511 | 65 | dev->hw_dev = get_device(hw_dev); |
da717511 IA |
66 | return 0; |
67 | } | |
68 | EXPORT_SYMBOL_GPL(comedi_set_hw_dev); | |
69 | ||
de06d7c6 IA |
70 | static void comedi_clear_hw_dev(struct comedi_device *dev) |
71 | { | |
72 | put_device(dev->hw_dev); | |
73 | dev->hw_dev = NULL; | |
74 | } | |
75 | ||
54db996e | 76 | /** |
9b34845e IA |
77 | * comedi_alloc_devpriv() - Allocate memory for the device private data |
78 | * @dev: COMEDI device. | |
79 | * @size: Size of the memory to allocate. | |
80 | * | |
81 | * The allocated memory is zero-filled. @dev->private points to it on | |
82 | * return. The memory will be automatically freed when the COMEDI device is | |
83 | * "detached". | |
84 | * | |
85 | * Returns a pointer to the allocated memory, or NULL on failure. | |
54db996e HS |
86 | */ |
87 | void *comedi_alloc_devpriv(struct comedi_device *dev, size_t size) | |
88 | { | |
89 | dev->private = kzalloc(size, GFP_KERNEL); | |
90 | return dev->private; | |
91 | } | |
92 | EXPORT_SYMBOL_GPL(comedi_alloc_devpriv); | |
93 | ||
9b34845e IA |
94 | /** |
95 | * comedi_alloc_subdevices() - Allocate subdevices for COMEDI device | |
96 | * @dev: COMEDI device. | |
97 | * @num_subdevices: Number of subdevices to allocate. | |
98 | * | |
99 | * Allocates and initializes an array of &struct comedi_subdevice for the | |
100 | * COMEDI device. If successful, sets @dev->subdevices to point to the | |
101 | * first one and @dev->n_subdevices to the number. | |
102 | * | |
103 | * Returns 0 on success, -EINVAL if @num_subdevices is < 1, or -ENOMEM if | |
104 | * failed to allocate the memory. | |
105 | */ | |
8b9ba6e5 | 106 | int comedi_alloc_subdevices(struct comedi_device *dev, int num_subdevices) |
2f0b9d08 | 107 | { |
03afcf47 | 108 | struct comedi_subdevice *s; |
8b9ba6e5 | 109 | int i; |
2f0b9d08 | 110 | |
7f801c41 HS |
111 | if (num_subdevices < 1) |
112 | return -EINVAL; | |
03afcf47 HS |
113 | |
114 | s = kcalloc(num_subdevices, sizeof(*s), GFP_KERNEL); | |
115 | if (!s) | |
2f0b9d08 | 116 | return -ENOMEM; |
03afcf47 | 117 | dev->subdevices = s; |
fba1d0fa | 118 | dev->n_subdevices = num_subdevices; |
03afcf47 | 119 | |
2f0b9d08 | 120 | for (i = 0; i < num_subdevices; ++i) { |
5e4c58ce | 121 | s = &dev->subdevices[i]; |
03afcf47 | 122 | s->device = dev; |
90a35c15 | 123 | s->index = i; |
03afcf47 HS |
124 | s->async_dma_dir = DMA_NONE; |
125 | spin_lock_init(&s->spin_lock); | |
126 | s->minor = -1; | |
2f0b9d08 HS |
127 | } |
128 | return 0; | |
129 | } | |
130 | EXPORT_SYMBOL_GPL(comedi_alloc_subdevices); | |
131 | ||
d2762066 | 132 | /** |
9b34845e IA |
133 | * comedi_alloc_subdev_readback() - Allocate memory for the subdevice readback |
134 | * @s: COMEDI subdevice. | |
135 | * | |
136 | * This is called by low-level COMEDI drivers to allocate an array to record | |
137 | * the last values written to a subdevice's analog output channels (at least | |
138 | * by the %INSN_WRITE instruction), to allow them to be read back by an | |
139 | * %INSN_READ instruction. It also provides a default handler for the | |
140 | * %INSN_READ instruction unless one has already been set. | |
141 | * | |
142 | * On success, @s->readback points to the first element of the array, which | |
143 | * is zero-filled. The low-level driver is responsible for updating its | |
144 | * contents. @s->insn_read will be set to comedi_readback_insn_read() | |
145 | * unless it is already non-NULL. | |
146 | * | |
147 | * Returns 0 on success, -EINVAL if the subdevice has no channels, or | |
148 | * -ENOMEM on allocation failure. | |
d2762066 HS |
149 | */ |
150 | int comedi_alloc_subdev_readback(struct comedi_subdevice *s) | |
151 | { | |
152 | if (!s->n_chan) | |
153 | return -EINVAL; | |
154 | ||
155 | s->readback = kcalloc(s->n_chan, sizeof(*s->readback), GFP_KERNEL); | |
156 | if (!s->readback) | |
157 | return -ENOMEM; | |
aa11672e HS |
158 | |
159 | if (!s->insn_read) | |
160 | s->insn_read = comedi_readback_insn_read; | |
161 | ||
d2762066 HS |
162 | return 0; |
163 | } | |
164 | EXPORT_SYMBOL_GPL(comedi_alloc_subdev_readback); | |
165 | ||
3867e20d | 166 | static void comedi_device_detach_cleanup(struct comedi_device *dev) |
ed9eccbe DS |
167 | { |
168 | int i; | |
34c43922 | 169 | struct comedi_subdevice *s; |
ed9eccbe DS |
170 | |
171 | if (dev->subdevices) { | |
172 | for (i = 0; i < dev->n_subdevices; i++) { | |
5e4c58ce | 173 | s = &dev->subdevices[i]; |
8fc369ae | 174 | if (comedi_can_auto_free_spriv(s)) |
588ba6dc | 175 | kfree(s->private); |
ed9eccbe DS |
176 | comedi_free_subdevice_minor(s); |
177 | if (s->async) { | |
178 | comedi_buf_alloc(dev, s, 0); | |
179 | kfree(s->async); | |
180 | } | |
d2762066 | 181 | kfree(s->readback); |
ed9eccbe DS |
182 | } |
183 | kfree(dev->subdevices); | |
184 | dev->subdevices = NULL; | |
185 | dev->n_subdevices = 0; | |
186 | } | |
dedd1325 | 187 | kfree(dev->private); |
43db062a | 188 | kfree(dev->pacer); |
dedd1325 | 189 | dev->private = NULL; |
43db062a | 190 | dev->pacer = NULL; |
7029a874 | 191 | dev->driver = NULL; |
ed9eccbe DS |
192 | dev->board_name = NULL; |
193 | dev->board_ptr = NULL; | |
d7e6dc13 | 194 | dev->mmio = NULL; |
ed9eccbe | 195 | dev->iobase = 0; |
316f97f1 | 196 | dev->iolen = 0; |
00ca6884 | 197 | dev->ioenabled = false; |
ed9eccbe DS |
198 | dev->irq = 0; |
199 | dev->read_subdev = NULL; | |
200 | dev->write_subdev = NULL; | |
201 | dev->open = NULL; | |
202 | dev->close = NULL; | |
de06d7c6 | 203 | comedi_clear_hw_dev(dev); |
ed9eccbe DS |
204 | } |
205 | ||
016599f5 | 206 | void comedi_device_detach(struct comedi_device *dev) |
ed9eccbe | 207 | { |
d19db51a | 208 | comedi_device_cancel_all(dev); |
bf11c134 | 209 | down_write(&dev->attach_lock); |
a7401cdd | 210 | dev->attached = false; |
ef77c0b2 | 211 | dev->detach_count++; |
5617f9da | 212 | if (dev->driver) |
ed9eccbe | 213 | dev->driver->detach(dev); |
3867e20d | 214 | comedi_device_detach_cleanup(dev); |
bf11c134 | 215 | up_write(&dev->attach_lock); |
ed9eccbe DS |
216 | } |
217 | ||
01fca378 | 218 | static int poll_invalid(struct comedi_device *dev, struct comedi_subdevice *s) |
ed9eccbe | 219 | { |
01fca378 | 220 | return -EINVAL; |
ed9eccbe DS |
221 | } |
222 | ||
01fca378 HS |
223 | int insn_inval(struct comedi_device *dev, struct comedi_subdevice *s, |
224 | struct comedi_insn *insn, unsigned int *data) | |
ed9eccbe | 225 | { |
01fca378 | 226 | return -EINVAL; |
ed9eccbe DS |
227 | } |
228 | ||
d2762066 HS |
229 | /** |
230 | * comedi_readback_insn_read() - A generic (*insn_read) for subdevice readback. | |
9b34845e IA |
231 | * @dev: COMEDI device. |
232 | * @s: COMEDI subdevice. | |
233 | * @insn: COMEDI instruction. | |
234 | * @data: Pointer to return the readback data. | |
235 | * | |
236 | * Handles the %INSN_READ instruction for subdevices that use the readback | |
237 | * array allocated by comedi_alloc_subdev_readback(). It may be used | |
238 | * directly as the subdevice's handler (@s->insn_read) or called via a | |
239 | * wrapper. | |
240 | * | |
241 | * @insn->n is normally 1, which will read a single value. If higher, the | |
242 | * same element of the readback array will be read multiple times. | |
243 | * | |
244 | * Returns @insn->n on success, or -EINVAL if @s->readback is NULL. | |
d2762066 HS |
245 | */ |
246 | int comedi_readback_insn_read(struct comedi_device *dev, | |
247 | struct comedi_subdevice *s, | |
248 | struct comedi_insn *insn, | |
249 | unsigned int *data) | |
250 | { | |
251 | unsigned int chan = CR_CHAN(insn->chanspec); | |
252 | int i; | |
253 | ||
254 | if (!s->readback) | |
255 | return -EINVAL; | |
256 | ||
257 | for (i = 0; i < insn->n; i++) | |
258 | data[i] = s->readback[chan]; | |
259 | ||
260 | return insn->n; | |
261 | } | |
262 | EXPORT_SYMBOL_GPL(comedi_readback_insn_read); | |
263 | ||
91506408 | 264 | /** |
9b34845e IA |
265 | * comedi_timeout() - Busy-wait for a driver condition to occur |
266 | * @dev: COMEDI device. | |
267 | * @s: COMEDI subdevice. | |
268 | * @insn: COMEDI instruction. | |
269 | * @cb: Callback to check for the condition. | |
270 | * @context: Private context from the driver. | |
271 | * | |
272 | * Busy-waits for up to a second (%COMEDI_TIMEOUT_MS) for the condition or | |
273 | * some error (other than -EBUSY) to occur. The parameters @dev, @s, @insn, | |
274 | * and @context are passed to the callback function, which returns -EBUSY to | |
275 | * continue waiting or some other value to stop waiting (generally 0 if the | |
276 | * condition occurred, or some error value). | |
277 | * | |
278 | * Returns -ETIMEDOUT if timed out, otherwise the return value from the | |
279 | * callback function. | |
91506408 HS |
280 | */ |
281 | int comedi_timeout(struct comedi_device *dev, | |
282 | struct comedi_subdevice *s, | |
283 | struct comedi_insn *insn, | |
284 | int (*cb)(struct comedi_device *dev, | |
285 | struct comedi_subdevice *s, | |
286 | struct comedi_insn *insn, | |
287 | unsigned long context), | |
288 | unsigned long context) | |
289 | { | |
290 | unsigned long timeout = jiffies + msecs_to_jiffies(COMEDI_TIMEOUT_MS); | |
291 | int ret; | |
292 | ||
293 | while (time_before(jiffies, timeout)) { | |
294 | ret = cb(dev, s, insn, context); | |
295 | if (ret != -EBUSY) | |
296 | return ret; /* success (0) or non EBUSY errno */ | |
297 | cpu_relax(); | |
298 | } | |
299 | return -ETIMEDOUT; | |
300 | } | |
301 | EXPORT_SYMBOL_GPL(comedi_timeout); | |
302 | ||
e523c6c8 | 303 | /** |
9b34845e IA |
304 | * comedi_dio_insn_config() - Boilerplate (*insn_config) for DIO subdevices |
305 | * @dev: COMEDI device. | |
306 | * @s: COMEDI subdevice. | |
307 | * @insn: COMEDI instruction. | |
308 | * @data: Instruction parameters and return data. | |
309 | * @mask: io_bits mask for grouped channels, or 0 for single channel. | |
310 | * | |
311 | * If @mask is 0, it is replaced with a single-bit mask corresponding to the | |
312 | * channel number specified by @insn->chanspec. Otherwise, @mask | |
313 | * corresponds to a group of channels (which should include the specified | |
314 | * channel) that are always configured together as inputs or outputs. | |
315 | * | |
316 | * Partially handles the %INSN_CONFIG_DIO_INPUT, %INSN_CONFIG_DIO_OUTPUTS, | |
317 | * and %INSN_CONFIG_DIO_QUERY instructions. The first two update | |
318 | * @s->io_bits to record the directions of the masked channels. The last | |
319 | * one sets @data[1] to the current direction of the group of channels | |
320 | * (%COMEDI_INPUT) or %COMEDI_OUTPUT) as recorded in @s->io_bits. | |
321 | * | |
322 | * The caller is responsible for updating the DIO direction in the hardware | |
323 | * registers if this function returns 0. | |
324 | * | |
325 | * Returns 0 for a %INSN_CONFIG_DIO_INPUT or %INSN_CONFIG_DIO_OUTPUT | |
326 | * instruction, @insn->n (> 0) for a %INSN_CONFIG_DIO_QUERY instruction, or | |
327 | * -EINVAL for some other instruction. | |
e523c6c8 HS |
328 | */ |
329 | int comedi_dio_insn_config(struct comedi_device *dev, | |
330 | struct comedi_subdevice *s, | |
331 | struct comedi_insn *insn, | |
332 | unsigned int *data, | |
333 | unsigned int mask) | |
334 | { | |
335 | unsigned int chan_mask = 1 << CR_CHAN(insn->chanspec); | |
336 | ||
337 | if (!mask) | |
338 | mask = chan_mask; | |
339 | ||
340 | switch (data[0]) { | |
341 | case INSN_CONFIG_DIO_INPUT: | |
342 | s->io_bits &= ~mask; | |
343 | break; | |
344 | ||
345 | case INSN_CONFIG_DIO_OUTPUT: | |
346 | s->io_bits |= mask; | |
347 | break; | |
348 | ||
349 | case INSN_CONFIG_DIO_QUERY: | |
350 | data[1] = (s->io_bits & mask) ? COMEDI_OUTPUT : COMEDI_INPUT; | |
351 | return insn->n; | |
352 | ||
353 | default: | |
354 | return -EINVAL; | |
355 | } | |
356 | ||
357 | return 0; | |
358 | } | |
359 | EXPORT_SYMBOL_GPL(comedi_dio_insn_config); | |
360 | ||
05e60b13 | 361 | /** |
9b34845e IA |
362 | * comedi_dio_update_state() - Update the internal state of DIO subdevices |
363 | * @s: COMEDI subdevice. | |
364 | * @data: The channel mask and bits to update. | |
365 | * | |
366 | * Updates @s->state which holds the internal state of the outputs for DIO | |
367 | * or DO subdevices (up to 32 channels). @data[0] contains a bit-mask of | |
368 | * the channels to be updated. @data[1] contains a bit-mask of those | |
369 | * channels to be set to '1'. The caller is responsible for updating the | |
370 | * outputs in hardware according to @s->state. As a minimum, the channels | |
371 | * in the returned bit-mask need to be updated. | |
372 | * | |
373 | * Returns @mask with non-existent channels removed. | |
05e60b13 HS |
374 | */ |
375 | unsigned int comedi_dio_update_state(struct comedi_subdevice *s, | |
376 | unsigned int *data) | |
377 | { | |
378 | unsigned int chanmask = (s->n_chan < 32) ? ((1 << s->n_chan) - 1) | |
379 | : 0xffffffff; | |
380 | unsigned int mask = data[0] & chanmask; | |
381 | unsigned int bits = data[1]; | |
382 | ||
383 | if (mask) { | |
384 | s->state &= ~mask; | |
385 | s->state |= (bits & mask); | |
386 | } | |
387 | ||
388 | return mask; | |
389 | } | |
390 | EXPORT_SYMBOL_GPL(comedi_dio_update_state); | |
391 | ||
f146fe63 | 392 | /** |
9b34845e IA |
393 | * comedi_bytes_per_scan() - Get length of asynchronous command "scan" in bytes |
394 | * @s: COMEDI subdevice. | |
f146fe63 IA |
395 | * |
396 | * Determines the overall scan length according to the subdevice type and the | |
397 | * number of channels in the scan. | |
398 | * | |
9b34845e IA |
399 | * For digital input, output or input/output subdevices, samples for |
400 | * multiple channels are assumed to be packed into one or more unsigned | |
401 | * short or unsigned int values according to the subdevice's %SDF_LSAMPL | |
402 | * flag. For other types of subdevice, samples are assumed to occupy a | |
403 | * whole unsigned short or unsigned int according to the %SDF_LSAMPL flag. | |
f146fe63 IA |
404 | * |
405 | * Returns the overall scan length in bytes. | |
406 | */ | |
407 | unsigned int comedi_bytes_per_scan(struct comedi_subdevice *s) | |
408 | { | |
409 | struct comedi_cmd *cmd = &s->async->cmd; | |
410 | unsigned int num_samples; | |
411 | unsigned int bits_per_sample; | |
412 | ||
413 | switch (s->type) { | |
414 | case COMEDI_SUBD_DI: | |
415 | case COMEDI_SUBD_DO: | |
416 | case COMEDI_SUBD_DIO: | |
c39e050d | 417 | bits_per_sample = 8 * comedi_bytes_per_sample(s); |
af57d89e | 418 | num_samples = DIV_ROUND_UP(cmd->scan_end_arg, bits_per_sample); |
f146fe63 IA |
419 | break; |
420 | default: | |
af57d89e | 421 | num_samples = cmd->scan_end_arg; |
f146fe63 IA |
422 | break; |
423 | } | |
c39e050d | 424 | return comedi_samples_to_bytes(s, num_samples); |
f146fe63 IA |
425 | } |
426 | EXPORT_SYMBOL_GPL(comedi_bytes_per_scan); | |
427 | ||
92d354cb IA |
428 | static unsigned int __comedi_nscans_left(struct comedi_subdevice *s, |
429 | unsigned int nscans) | |
430 | { | |
431 | struct comedi_async *async = s->async; | |
432 | struct comedi_cmd *cmd = &async->cmd; | |
433 | ||
434 | if (cmd->stop_src == TRIG_COUNT) { | |
435 | unsigned int scans_left = 0; | |
436 | ||
437 | if (async->scans_done < cmd->stop_arg) | |
438 | scans_left = cmd->stop_arg - async->scans_done; | |
439 | ||
440 | if (nscans > scans_left) | |
441 | nscans = scans_left; | |
442 | } | |
443 | return nscans; | |
444 | } | |
445 | ||
2ee37750 | 446 | /** |
9b34845e IA |
447 | * comedi_nscans_left() - Return the number of scans left in the command |
448 | * @s: COMEDI subdevice. | |
449 | * @nscans: The expected number of scans or 0 for all available scans. | |
2ee37750 | 450 | * |
9b34845e IA |
451 | * If @nscans is 0, it is set to the number of scans available in the |
452 | * async buffer. | |
2ee37750 | 453 | * |
9b34845e IA |
454 | * If the async command has a stop_src of %TRIG_COUNT, the @nscans will be |
455 | * checked against the number of scans remaining to complete the command. | |
2ee37750 HS |
456 | * |
457 | * The return value will then be either the expected number of scans or the | |
9b34845e | 458 | * number of scans remaining to complete the command, whichever is fewer. |
2ee37750 HS |
459 | */ |
460 | unsigned int comedi_nscans_left(struct comedi_subdevice *s, | |
461 | unsigned int nscans) | |
462 | { | |
2ee37750 HS |
463 | if (nscans == 0) { |
464 | unsigned int nbytes = comedi_buf_read_n_available(s); | |
465 | ||
466 | nscans = nbytes / comedi_bytes_per_scan(s); | |
467 | } | |
92d354cb | 468 | return __comedi_nscans_left(s, nscans); |
2ee37750 HS |
469 | } |
470 | EXPORT_SYMBOL_GPL(comedi_nscans_left); | |
471 | ||
f615915e | 472 | /** |
9b34845e IA |
473 | * comedi_nsamples_left() - Return the number of samples left in the command |
474 | * @s: COMEDI subdevice. | |
475 | * @nsamples: The expected number of samples. | |
f615915e | 476 | * |
9b34845e IA |
477 | * Returns the number of samples remaining to complete the command, or the |
478 | * specified expected number of samples (@nsamples), whichever is fewer. | |
f615915e HS |
479 | */ |
480 | unsigned int comedi_nsamples_left(struct comedi_subdevice *s, | |
481 | unsigned int nsamples) | |
482 | { | |
483 | struct comedi_async *async = s->async; | |
484 | struct comedi_cmd *cmd = &async->cmd; | |
485 | ||
486 | if (cmd->stop_src == TRIG_COUNT) { | |
92d354cb IA |
487 | unsigned int nscans = nsamples / cmd->scan_end_arg; |
488 | unsigned int scans_left = __comedi_nscans_left(s, nscans); | |
af57d89e IA |
489 | unsigned int scan_pos = |
490 | comedi_bytes_to_samples(s, async->scan_progress); | |
f615915e HS |
491 | unsigned long long samples_left = 0; |
492 | ||
493 | if (scans_left) { | |
494 | samples_left = ((unsigned long long)scans_left * | |
af57d89e | 495 | cmd->scan_end_arg) - scan_pos; |
f615915e HS |
496 | } |
497 | ||
498 | if (samples_left < nsamples) | |
499 | nsamples = samples_left; | |
500 | } | |
501 | return nsamples; | |
502 | } | |
503 | EXPORT_SYMBOL_GPL(comedi_nsamples_left); | |
504 | ||
2b4e1f63 | 505 | /** |
9b34845e IA |
506 | * comedi_inc_scan_progress() - Update scan progress in asynchronous command |
507 | * @s: COMEDI subdevice. | |
508 | * @num_bytes: Amount of data in bytes to increment scan progress. | |
2b4e1f63 | 509 | * |
9b34845e | 510 | * Increments the scan progress by the number of bytes specified by @num_bytes. |
2b4e1f63 IA |
511 | * If the scan progress reaches or exceeds the scan length in bytes, reduce |
512 | * it modulo the scan length in bytes and set the "end of scan" asynchronous | |
9b34845e | 513 | * event flag (%COMEDI_CB_EOS) to be processed later. |
2b4e1f63 IA |
514 | */ |
515 | void comedi_inc_scan_progress(struct comedi_subdevice *s, | |
516 | unsigned int num_bytes) | |
517 | { | |
518 | struct comedi_async *async = s->async; | |
f8736ca4 | 519 | struct comedi_cmd *cmd = &async->cmd; |
2b4e1f63 IA |
520 | unsigned int scan_length = comedi_bytes_per_scan(s); |
521 | ||
f8736ca4 HS |
522 | /* track the 'cur_chan' for non-SDF_PACKED subdevices */ |
523 | if (!(s->subdev_flags & SDF_PACKED)) { | |
524 | async->cur_chan += comedi_bytes_to_samples(s, num_bytes); | |
525 | async->cur_chan %= cmd->chanlist_len; | |
526 | } | |
527 | ||
2b4e1f63 IA |
528 | async->scan_progress += num_bytes; |
529 | if (async->scan_progress >= scan_length) { | |
1dacbe5b HS |
530 | unsigned int nscans = async->scan_progress / scan_length; |
531 | ||
532 | if (async->scans_done < (UINT_MAX - nscans)) | |
533 | async->scans_done += nscans; | |
534 | else | |
535 | async->scans_done = UINT_MAX; | |
536 | ||
2b4e1f63 IA |
537 | async->scan_progress %= scan_length; |
538 | async->events |= COMEDI_CB_EOS; | |
539 | } | |
540 | } | |
541 | EXPORT_SYMBOL_GPL(comedi_inc_scan_progress); | |
542 | ||
5a780359 | 543 | /** |
9b34845e IA |
544 | * comedi_handle_events() - Handle events and possibly stop acquisition |
545 | * @dev: COMEDI device. | |
546 | * @s: COMEDI subdevice. | |
5a780359 IA |
547 | * |
548 | * Handles outstanding asynchronous acquisition event flags associated | |
9b34845e | 549 | * with the subdevice. Call the subdevice's @s->cancel() handler if the |
5a780359 IA |
550 | * "end of acquisition", "error" or "overflow" event flags are set in order |
551 | * to stop the acquisition at the driver level. | |
552 | * | |
553 | * Calls comedi_event() to further process the event flags, which may mark | |
554 | * the asynchronous command as no longer running, possibly terminated with | |
555 | * an error, and may wake up tasks. | |
556 | * | |
557 | * Return a bit-mask of the handled events. | |
558 | */ | |
559 | unsigned int comedi_handle_events(struct comedi_device *dev, | |
560 | struct comedi_subdevice *s) | |
561 | { | |
562 | unsigned int events = s->async->events; | |
563 | ||
564 | if (events == 0) | |
565 | return events; | |
566 | ||
7be7cd10 | 567 | if ((events & COMEDI_CB_CANCEL_MASK) && s->cancel) |
5a780359 IA |
568 | s->cancel(dev, s); |
569 | ||
570 | comedi_event(dev, s); | |
571 | ||
572 | return events; | |
573 | } | |
574 | EXPORT_SYMBOL_GPL(comedi_handle_events); | |
575 | ||
01fca378 HS |
576 | static int insn_rw_emulate_bits(struct comedi_device *dev, |
577 | struct comedi_subdevice *s, | |
f91852ce HS |
578 | struct comedi_insn *insn, |
579 | unsigned int *data) | |
ed9eccbe | 580 | { |
f91852ce HS |
581 | struct comedi_insn _insn; |
582 | unsigned int chan = CR_CHAN(insn->chanspec); | |
583 | unsigned int base_chan = (chan < 32) ? 0 : chan; | |
584 | unsigned int _data[2]; | |
01fca378 | 585 | int ret; |
1e4742df | 586 | |
f91852ce HS |
587 | memset(_data, 0, sizeof(_data)); |
588 | memset(&_insn, 0, sizeof(_insn)); | |
589 | _insn.insn = INSN_BITS; | |
590 | _insn.chanspec = base_chan; | |
591 | _insn.n = 2; | |
592 | _insn.subdev = insn->subdev; | |
ed9eccbe | 593 | |
01fca378 HS |
594 | if (insn->insn == INSN_WRITE) { |
595 | if (!(s->subdev_flags & SDF_WRITABLE)) | |
596 | return -EINVAL; | |
f91852ce HS |
597 | _data[0] = 1 << (chan - base_chan); /* mask */ |
598 | _data[1] = data[0] ? (1 << (chan - base_chan)) : 0; /* bits */ | |
ed9eccbe DS |
599 | } |
600 | ||
f91852ce | 601 | ret = s->insn_bits(dev, s, &_insn, _data); |
01fca378 HS |
602 | if (ret < 0) |
603 | return ret; | |
ed9eccbe | 604 | |
01fca378 | 605 | if (insn->insn == INSN_READ) |
f91852ce | 606 | data[0] = (_data[1] >> (chan - base_chan)) & 1; |
01fca378 HS |
607 | |
608 | return 1; | |
ed9eccbe DS |
609 | } |
610 | ||
40f58a65 HS |
611 | static int __comedi_device_postconfig_async(struct comedi_device *dev, |
612 | struct comedi_subdevice *s) | |
613 | { | |
614 | struct comedi_async *async; | |
615 | unsigned int buf_size; | |
616 | int ret; | |
617 | ||
57b71c3e HS |
618 | if ((s->subdev_flags & (SDF_CMD_READ | SDF_CMD_WRITE)) == 0) { |
619 | dev_warn(dev->class_dev, | |
620 | "async subdevices must support SDF_CMD_READ or SDF_CMD_WRITE\n"); | |
621 | return -EINVAL; | |
622 | } | |
623 | if (!s->do_cmdtest) { | |
624 | dev_warn(dev->class_dev, | |
625 | "async subdevices must have a do_cmdtest() function\n"); | |
626 | return -EINVAL; | |
627 | } | |
7be7cd10 HS |
628 | if (!s->cancel) |
629 | dev_warn(dev->class_dev, | |
630 | "async subdevices should have a cancel() function\n"); | |
40f58a65 HS |
631 | |
632 | async = kzalloc(sizeof(*async), GFP_KERNEL); | |
78110bb8 | 633 | if (!async) |
40f58a65 | 634 | return -ENOMEM; |
78110bb8 | 635 | |
40f58a65 | 636 | init_waitqueue_head(&async->wait_head); |
40f58a65 HS |
637 | s->async = async; |
638 | ||
639 | async->max_bufsize = comedi_default_buf_maxsize_kb * 1024; | |
640 | buf_size = comedi_default_buf_size_kb * 1024; | |
641 | if (buf_size > async->max_bufsize) | |
642 | buf_size = async->max_bufsize; | |
643 | ||
644 | if (comedi_buf_alloc(dev, s, buf_size) < 0) { | |
645 | dev_warn(dev->class_dev, "Buffer allocation failed\n"); | |
646 | return -ENOMEM; | |
647 | } | |
648 | if (s->buf_change) { | |
d546b896 | 649 | ret = s->buf_change(dev, s); |
40f58a65 HS |
650 | if (ret < 0) |
651 | return ret; | |
652 | } | |
653 | ||
f65cc544 | 654 | comedi_alloc_subdevice_minor(s); |
40f58a65 HS |
655 | |
656 | return 0; | |
657 | } | |
658 | ||
659 | static int __comedi_device_postconfig(struct comedi_device *dev) | |
ed9eccbe | 660 | { |
34c43922 | 661 | struct comedi_subdevice *s; |
ed9eccbe | 662 | int ret; |
40f58a65 | 663 | int i; |
ed9eccbe DS |
664 | |
665 | for (i = 0; i < dev->n_subdevices; i++) { | |
5e4c58ce | 666 | s = &dev->subdevices[i]; |
ed9eccbe DS |
667 | |
668 | if (s->type == COMEDI_SUBD_UNUSED) | |
669 | continue; | |
670 | ||
09567cb4 HS |
671 | if (s->type == COMEDI_SUBD_DO) { |
672 | if (s->n_chan < 32) | |
673 | s->io_bits = (1 << s->n_chan) - 1; | |
674 | else | |
675 | s->io_bits = 0xffffffff; | |
676 | } | |
677 | ||
ed9eccbe DS |
678 | if (s->len_chanlist == 0) |
679 | s->len_chanlist = 1; | |
680 | ||
681 | if (s->do_cmd) { | |
40f58a65 HS |
682 | ret = __comedi_device_postconfig_async(dev, s); |
683 | if (ret) | |
684 | return ret; | |
ed9eccbe DS |
685 | } |
686 | ||
687 | if (!s->range_table && !s->range_table_list) | |
688 | s->range_table = &range_unknown; | |
689 | ||
690 | if (!s->insn_read && s->insn_bits) | |
691 | s->insn_read = insn_rw_emulate_bits; | |
692 | if (!s->insn_write && s->insn_bits) | |
693 | s->insn_write = insn_rw_emulate_bits; | |
694 | ||
695 | if (!s->insn_read) | |
696 | s->insn_read = insn_inval; | |
697 | if (!s->insn_write) | |
698 | s->insn_write = insn_inval; | |
699 | if (!s->insn_bits) | |
700 | s->insn_bits = insn_inval; | |
701 | if (!s->insn_config) | |
702 | s->insn_config = insn_inval; | |
703 | ||
704 | if (!s->poll) | |
705 | s->poll = poll_invalid; | |
706 | } | |
707 | ||
708 | return 0; | |
709 | } | |
710 | ||
01fca378 | 711 | /* do a little post-config cleanup */ |
01fca378 HS |
712 | static int comedi_device_postconfig(struct comedi_device *dev) |
713 | { | |
b2a644b4 IA |
714 | int ret; |
715 | ||
716 | ret = __comedi_device_postconfig(dev); | |
ae5dd5fc | 717 | if (ret < 0) |
01fca378 | 718 | return ret; |
bf11c134 | 719 | down_write(&dev->attach_lock); |
a7401cdd | 720 | dev->attached = true; |
bf11c134 | 721 | up_write(&dev->attach_lock); |
01fca378 HS |
722 | return 0; |
723 | } | |
724 | ||
4e2f002f IA |
725 | /* |
726 | * Generic recognize function for drivers that register their supported | |
727 | * board names. | |
728 | * | |
729 | * 'driv->board_name' points to a 'const char *' member within the | |
730 | * zeroth element of an array of some private board information | |
731 | * structure, say 'struct foo_board' containing a member 'const char | |
732 | * *board_name' that is initialized to point to a board name string that | |
733 | * is one of the candidates matched against this function's 'name' | |
734 | * parameter. | |
735 | * | |
736 | * 'driv->offset' is the size of the private board information | |
737 | * structure, say 'sizeof(struct foo_board)', and 'driv->num_names' is | |
738 | * the length of the array of private board information structures. | |
739 | * | |
740 | * If one of the board names in the array of private board information | |
741 | * structures matches the name supplied to this function, the function | |
742 | * returns a pointer to the pointer to the board name, otherwise it | |
743 | * returns NULL. The return value ends up in the 'board_ptr' member of | |
744 | * a 'struct comedi_device' that the low-level comedi driver's | |
745 | * 'attach()' hook can convert to a point to a particular element of its | |
746 | * array of private board information structures by subtracting the | |
747 | * offset of the member that points to the board name. (No subtraction | |
748 | * is required if the board name pointer is the first member of the | |
749 | * private board information structure, which is generally the case.) | |
750 | */ | |
7029a874 | 751 | static void *comedi_recognize(struct comedi_driver *driv, const char *name) |
ed9eccbe | 752 | { |
1c9de58a DC |
753 | char **name_ptr = (char **)driv->board_name; |
754 | int i; | |
755 | ||
ed9eccbe DS |
756 | for (i = 0; i < driv->num_names; i++) { |
757 | if (strcmp(*name_ptr, name) == 0) | |
1c9de58a DC |
758 | return name_ptr; |
759 | name_ptr = (void *)name_ptr + driv->offset; | |
ed9eccbe DS |
760 | } |
761 | ||
762 | return NULL; | |
763 | } | |
764 | ||
7029a874 | 765 | static void comedi_report_boards(struct comedi_driver *driv) |
ed9eccbe DS |
766 | { |
767 | unsigned int i; | |
768 | const char *const *name_ptr; | |
769 | ||
4f870fe6 IA |
770 | pr_info("comedi: valid board names for %s driver are:\n", |
771 | driv->driver_name); | |
ed9eccbe DS |
772 | |
773 | name_ptr = driv->board_name; | |
774 | for (i = 0; i < driv->num_names; i++) { | |
4f870fe6 | 775 | pr_info(" %s\n", *name_ptr); |
ed9eccbe DS |
776 | name_ptr = (const char **)((char *)name_ptr + driv->offset); |
777 | } | |
778 | ||
779 | if (driv->num_names == 0) | |
4f870fe6 | 780 | pr_info(" %s\n", driv->driver_name); |
ed9eccbe DS |
781 | } |
782 | ||
9ff8b151 | 783 | /** |
9b34845e IA |
784 | * comedi_load_firmware() - Request and load firmware for a device |
785 | * @dev: COMEDI device. | |
786 | * @device: Hardware device. | |
787 | * @name: The name of the firmware image. | |
788 | * @cb: Callback to the upload the firmware image. | |
789 | * @context: Private context from the driver. | |
790 | * | |
791 | * Sends a firmware request for the hardware device and waits for it. Calls | |
792 | * the callback function to upload the firmware to the device, them releases | |
793 | * the firmware. | |
794 | * | |
795 | * Returns 0 on success, -EINVAL if @cb is NULL, or a negative error number | |
796 | * from the firmware request or the callback function. | |
9ff8b151 HS |
797 | */ |
798 | int comedi_load_firmware(struct comedi_device *dev, | |
799 | struct device *device, | |
800 | const char *name, | |
801 | int (*cb)(struct comedi_device *dev, | |
d569541e HS |
802 | const u8 *data, size_t size, |
803 | unsigned long context), | |
804 | unsigned long context) | |
9ff8b151 HS |
805 | { |
806 | const struct firmware *fw; | |
807 | int ret; | |
808 | ||
809 | if (!cb) | |
810 | return -EINVAL; | |
811 | ||
812 | ret = request_firmware(&fw, name, device); | |
813 | if (ret == 0) { | |
d569541e | 814 | ret = cb(dev, fw->data, fw->size, context); |
9ff8b151 HS |
815 | release_firmware(fw); |
816 | } | |
817 | ||
c6236c0c | 818 | return ret < 0 ? ret : 0; |
9ff8b151 HS |
819 | } |
820 | EXPORT_SYMBOL_GPL(comedi_load_firmware); | |
821 | ||
f375ac5f | 822 | /** |
9b34845e IA |
823 | * __comedi_request_region() - Request an I/O region for a legacy driver |
824 | * @dev: COMEDI device. | |
825 | * @start: Base address of the I/O region. | |
826 | * @len: Length of the I/O region. | |
827 | * | |
828 | * Requests the specified I/O port region which must start at a non-zero | |
829 | * address. | |
830 | * | |
831 | * Returns 0 on success, -EINVAL if @start is 0, or -EIO if the request | |
832 | * fails. | |
f375ac5f | 833 | */ |
ca8b2964 HS |
834 | int __comedi_request_region(struct comedi_device *dev, |
835 | unsigned long start, unsigned long len) | |
f375ac5f HS |
836 | { |
837 | if (!start) { | |
838 | dev_warn(dev->class_dev, | |
839 | "%s: a I/O base address must be specified\n", | |
840 | dev->board_name); | |
841 | return -EINVAL; | |
842 | } | |
843 | ||
844 | if (!request_region(start, len, dev->board_name)) { | |
845 | dev_warn(dev->class_dev, "%s: I/O port conflict (%#lx,%lu)\n", | |
846 | dev->board_name, start, len); | |
847 | return -EIO; | |
848 | } | |
f375ac5f HS |
849 | |
850 | return 0; | |
851 | } | |
ca8b2964 HS |
852 | EXPORT_SYMBOL_GPL(__comedi_request_region); |
853 | ||
854 | /** | |
9b34845e IA |
855 | * comedi_request_region() - Request an I/O region for a legacy driver |
856 | * @dev: COMEDI device. | |
857 | * @start: Base address of the I/O region. | |
858 | * @len: Length of the I/O region. | |
859 | * | |
860 | * Requests the specified I/O port region which must start at a non-zero | |
861 | * address. | |
862 | * | |
863 | * On success, @dev->iobase is set to the base address of the region and | |
864 | * @dev->iolen is set to its length. | |
865 | * | |
866 | * Returns 0 on success, -EINVAL if @start is 0, or -EIO if the request | |
867 | * fails. | |
ca8b2964 HS |
868 | */ |
869 | int comedi_request_region(struct comedi_device *dev, | |
870 | unsigned long start, unsigned long len) | |
871 | { | |
872 | int ret; | |
873 | ||
874 | ret = __comedi_request_region(dev, start, len); | |
316f97f1 | 875 | if (ret == 0) { |
ca8b2964 | 876 | dev->iobase = start; |
316f97f1 HS |
877 | dev->iolen = len; |
878 | } | |
ca8b2964 HS |
879 | |
880 | return ret; | |
881 | } | |
f375ac5f HS |
882 | EXPORT_SYMBOL_GPL(comedi_request_region); |
883 | ||
316f97f1 | 884 | /** |
9b34845e IA |
885 | * comedi_legacy_detach() - A generic (*detach) function for legacy drivers |
886 | * @dev: COMEDI device. | |
887 | * | |
888 | * This is a simple, generic 'detach' handler for legacy COMEDI devices that | |
889 | * just use a single I/O port region and possibly an IRQ and that don't need | |
890 | * any special clean-up for their private device or subdevice storage. It | |
891 | * can also be called by a driver-specific 'detach' handler. | |
892 | * | |
893 | * If @dev->irq is non-zero, the IRQ will be freed. If @dev->iobase and | |
894 | * @dev->iolen are both non-zero, the I/O port region will be released. | |
316f97f1 HS |
895 | */ |
896 | void comedi_legacy_detach(struct comedi_device *dev) | |
897 | { | |
3d1fe3f7 HS |
898 | if (dev->irq) { |
899 | free_irq(dev->irq, dev); | |
900 | dev->irq = 0; | |
901 | } | |
316f97f1 HS |
902 | if (dev->iobase && dev->iolen) { |
903 | release_region(dev->iobase, dev->iolen); | |
904 | dev->iobase = 0; | |
905 | dev->iolen = 0; | |
906 | } | |
907 | } | |
908 | EXPORT_SYMBOL_GPL(comedi_legacy_detach); | |
909 | ||
01fca378 | 910 | int comedi_device_attach(struct comedi_device *dev, struct comedi_devconfig *it) |
ed9eccbe | 911 | { |
01fca378 HS |
912 | struct comedi_driver *driv; |
913 | int ret; | |
914 | ||
915 | if (dev->attached) | |
916 | return -EBUSY; | |
917 | ||
c383e2d6 | 918 | mutex_lock(&comedi_drivers_list_lock); |
01fca378 HS |
919 | for (driv = comedi_drivers; driv; driv = driv->next) { |
920 | if (!try_module_get(driv->module)) | |
921 | continue; | |
922 | if (driv->num_names) { | |
923 | dev->board_ptr = comedi_recognize(driv, it->board_name); | |
924 | if (dev->board_ptr) | |
925 | break; | |
3df9f21a | 926 | } else if (strcmp(driv->driver_name, it->board_name) == 0) { |
01fca378 | 927 | break; |
3df9f21a | 928 | } |
01fca378 HS |
929 | module_put(driv->module); |
930 | } | |
e2850160 | 931 | if (!driv) { |
01fca378 HS |
932 | /* recognize has failed if we get here */ |
933 | /* report valid board names before returning error */ | |
934 | for (driv = comedi_drivers; driv; driv = driv->next) { | |
935 | if (!try_module_get(driv->module)) | |
936 | continue; | |
937 | comedi_report_boards(driv); | |
938 | module_put(driv->module); | |
939 | } | |
c383e2d6 IA |
940 | ret = -EIO; |
941 | goto out; | |
01fca378 | 942 | } |
e2850160 | 943 | if (!driv->attach) { |
01fca378 HS |
944 | /* driver does not support manual configuration */ |
945 | dev_warn(dev->class_dev, | |
946 | "driver '%s' does not support attach using comedi_config\n", | |
947 | driv->driver_name); | |
948 | module_put(driv->module); | |
1a59adb2 | 949 | ret = -EIO; |
c383e2d6 | 950 | goto out; |
01fca378 | 951 | } |
01fca378 | 952 | dev->driver = driv; |
34b68400 HS |
953 | dev->board_name = dev->board_ptr ? *(const char **)dev->board_ptr |
954 | : dev->driver->driver_name; | |
01fca378 | 955 | ret = driv->attach(dev, it); |
74ece108 IA |
956 | if (ret >= 0) |
957 | ret = comedi_device_postconfig(dev); | |
01fca378 | 958 | if (ret < 0) { |
016599f5 | 959 | comedi_device_detach(dev); |
3955dfa8 | 960 | module_put(driv->module); |
01fca378 | 961 | } |
b2a644b4 | 962 | /* On success, the driver module count has been incremented. */ |
c383e2d6 IA |
963 | out: |
964 | mutex_unlock(&comedi_drivers_list_lock); | |
b2a644b4 | 965 | return ret; |
ed9eccbe DS |
966 | } |
967 | ||
9b34845e IA |
968 | /** |
969 | * comedi_auto_config() - Create a COMEDI device for a hardware device | |
970 | * @hardware_device: Hardware device. | |
971 | * @driver: COMEDI low-level driver for the hardware device. | |
972 | * @context: Driver context for the auto_attach handler. | |
973 | * | |
974 | * Allocates a new COMEDI device for the hardware device and calls the | |
975 | * low-level driver's 'auto_attach' handler to set-up the hardware and | |
976 | * allocate the COMEDI subdevices. Additional "post-configuration" setting | |
977 | * up is performed on successful return from the 'auto_attach' handler. | |
978 | * If the 'auto_attach' handler fails, the low-level driver's 'detach' | |
979 | * handler will be called as part of the clean-up. | |
980 | * | |
981 | * This is usually called from a wrapper function in a bus-specific COMEDI | |
982 | * module, which in turn is usually called from a bus device 'probe' | |
983 | * function in the low-level driver. | |
984 | * | |
985 | * Returns 0 on success, -EINVAL if the parameters are invalid or the | |
986 | * post-configuration determines the driver has set the COMEDI device up | |
987 | * incorrectly, -ENOMEM if failed to allocate memory, -EBUSY if run out of | |
988 | * COMEDI minor device numbers, or some negative error number returned by | |
989 | * the driver's 'auto_attach' handler. | |
990 | */ | |
a588da1d IA |
991 | int comedi_auto_config(struct device *hardware_device, |
992 | struct comedi_driver *driver, unsigned long context) | |
f4011670 | 993 | { |
6013a9a5 | 994 | struct comedi_device *dev; |
f4011670 IA |
995 | int ret; |
996 | ||
f08e0ac5 IA |
997 | if (!hardware_device) { |
998 | pr_warn("BUG! comedi_auto_config called with NULL hardware_device\n"); | |
999 | return -EINVAL; | |
1000 | } | |
1001 | if (!driver) { | |
1002 | dev_warn(hardware_device, | |
1003 | "BUG! comedi_auto_config called with NULL comedi driver\n"); | |
1004 | return -EINVAL; | |
1005 | } | |
1006 | ||
a588da1d IA |
1007 | if (!driver->auto_attach) { |
1008 | dev_warn(hardware_device, | |
1009 | "BUG! comedi driver '%s' has no auto_attach handler\n", | |
1010 | driver->driver_name); | |
1011 | return -EINVAL; | |
1012 | } | |
1013 | ||
6013a9a5 | 1014 | dev = comedi_alloc_board_minor(hardware_device); |
bcb6232d BP |
1015 | if (IS_ERR(dev)) { |
1016 | dev_warn(hardware_device, | |
1017 | "driver '%s' could not create device.\n", | |
1018 | driver->driver_name); | |
6013a9a5 | 1019 | return PTR_ERR(dev); |
bcb6232d | 1020 | } |
6013a9a5 | 1021 | /* Note: comedi_alloc_board_minor() locked dev->mutex. */ |
f4011670 | 1022 | |
6013a9a5 | 1023 | dev->driver = driver; |
34b68400 | 1024 | dev->board_name = dev->driver->driver_name; |
6013a9a5 | 1025 | ret = driver->auto_attach(dev, context); |
74ece108 | 1026 | if (ret >= 0) |
6013a9a5 | 1027 | ret = comedi_device_postconfig(dev); |
6013a9a5 | 1028 | mutex_unlock(&dev->mutex); |
f4011670 | 1029 | |
bcb6232d BP |
1030 | if (ret < 0) { |
1031 | dev_warn(hardware_device, | |
1032 | "driver '%s' failed to auto-configure device.\n", | |
1033 | driver->driver_name); | |
f5b31e15 | 1034 | comedi_release_hardware_device(hardware_device); |
bcb6232d BP |
1035 | } else { |
1036 | /* | |
1037 | * class_dev should be set properly here | |
1038 | * after a successful auto config | |
1039 | */ | |
1040 | dev_info(dev->class_dev, | |
1041 | "driver '%s' has successfully auto-configured '%s'.\n", | |
1042 | driver->driver_name, dev->board_name); | |
1043 | } | |
f4011670 IA |
1044 | return ret; |
1045 | } | |
8ed705af IA |
1046 | EXPORT_SYMBOL_GPL(comedi_auto_config); |
1047 | ||
9b34845e IA |
1048 | /** |
1049 | * comedi_auto_unconfig() - Unconfigure auto-allocated COMEDI device | |
1050 | * @hardware_device: Hardware device previously passed to | |
1051 | * comedi_auto_config(). | |
1052 | * | |
1053 | * Cleans up and eventually destroys the COMEDI device allocated by | |
1054 | * comedi_auto_config() for the same hardware device. As part of this | |
1055 | * clean-up, the low-level COMEDI driver's 'detach' handler will be called. | |
1056 | * (The COMEDI device itself will persist in an unattached state if it is | |
1057 | * still open, until it is released, and any mmapped buffers will persist | |
1058 | * until they are munmapped.) | |
1059 | * | |
1060 | * This is usually called from a wrapper module in a bus-specific COMEDI | |
1061 | * module, which in turn is usually set as the bus device 'remove' function | |
1062 | * in the low-level COMEDI driver. | |
1063 | */ | |
8ed705af | 1064 | void comedi_auto_unconfig(struct device *hardware_device) |
ed9eccbe | 1065 | { |
e2850160 | 1066 | if (!hardware_device) |
c43435d7 | 1067 | return; |
3346b798 | 1068 | comedi_release_hardware_device(hardware_device); |
ed9eccbe | 1069 | } |
8ed705af | 1070 | EXPORT_SYMBOL_GPL(comedi_auto_unconfig); |
1ae6b20b | 1071 | |
9b34845e IA |
1072 | /** |
1073 | * comedi_driver_register() - Register a low-level COMEDI driver | |
1074 | * @driver: Low-level COMEDI driver. | |
1075 | * | |
1076 | * The low-level COMEDI driver is added to the list of registered COMEDI | |
1077 | * drivers. This is used by the handler for the "/proc/comedi" file and is | |
1078 | * also used by the handler for the %COMEDI_DEVCONFIG ioctl to configure | |
1079 | * "legacy" COMEDI devices (for those low-level drivers that support it). | |
1080 | * | |
1081 | * Returns 0. | |
1082 | */ | |
1ae6b20b HS |
1083 | int comedi_driver_register(struct comedi_driver *driver) |
1084 | { | |
c383e2d6 | 1085 | mutex_lock(&comedi_drivers_list_lock); |
1ae6b20b HS |
1086 | driver->next = comedi_drivers; |
1087 | comedi_drivers = driver; | |
c383e2d6 | 1088 | mutex_unlock(&comedi_drivers_list_lock); |
1ae6b20b HS |
1089 | |
1090 | return 0; | |
1091 | } | |
5660e742 | 1092 | EXPORT_SYMBOL_GPL(comedi_driver_register); |
1ae6b20b | 1093 | |
9b34845e IA |
1094 | /** |
1095 | * comedi_driver_unregister() - Unregister a low-level COMEDI driver | |
1096 | * @driver: Low-level COMEDI driver. | |
1097 | * | |
1098 | * The low-level COMEDI driver is removed from the list of registered COMEDI | |
1099 | * drivers. Detaches any COMEDI devices attached to the driver, which will | |
1100 | * result in the low-level driver's 'detach' handler being called for those | |
1101 | * devices before this function returns. | |
1102 | */ | |
99c0e269 | 1103 | void comedi_driver_unregister(struct comedi_driver *driver) |
1ae6b20b HS |
1104 | { |
1105 | struct comedi_driver *prev; | |
1106 | int i; | |
1107 | ||
c383e2d6 IA |
1108 | /* unlink the driver */ |
1109 | mutex_lock(&comedi_drivers_list_lock); | |
1110 | if (comedi_drivers == driver) { | |
1111 | comedi_drivers = driver->next; | |
1112 | } else { | |
1113 | for (prev = comedi_drivers; prev->next; prev = prev->next) { | |
1114 | if (prev->next == driver) { | |
1115 | prev->next = driver->next; | |
1116 | break; | |
1117 | } | |
1118 | } | |
1119 | } | |
1120 | mutex_unlock(&comedi_drivers_list_lock); | |
1121 | ||
1ae6b20b HS |
1122 | /* check for devices using this driver */ |
1123 | for (i = 0; i < COMEDI_NUM_BOARD_MINORS; i++) { | |
a200fadc | 1124 | struct comedi_device *dev = comedi_dev_get_from_minor(i); |
1ae6b20b HS |
1125 | |
1126 | if (!dev) | |
1127 | continue; | |
1128 | ||
1129 | mutex_lock(&dev->mutex); | |
1130 | if (dev->attached && dev->driver == driver) { | |
1131 | if (dev->use_count) | |
1132 | dev_warn(dev->class_dev, | |
1133 | "BUG! detaching device with use_count=%d\n", | |
1134 | dev->use_count); | |
1135 | comedi_device_detach(dev); | |
1136 | } | |
1137 | mutex_unlock(&dev->mutex); | |
a200fadc | 1138 | comedi_dev_put(dev); |
1ae6b20b | 1139 | } |
1ae6b20b | 1140 | } |
5660e742 | 1141 | EXPORT_SYMBOL_GPL(comedi_driver_unregister); |