5 * COMEDI - Linux Control and Measurement Device Interface
6 * Copyright (C) 1997-2000 David A. Schleef <ds@schleef.org>
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.
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.
19 #define pr_fmt(fmt) KBUILD_MODNAME ": " fmt
21 #include "comedi_compat32.h"
23 #include <linux/module.h>
24 #include <linux/errno.h>
25 #include <linux/kernel.h>
26 #include <linux/sched.h>
27 #include <linux/fcntl.h>
28 #include <linux/delay.h>
30 #include <linux/slab.h>
31 #include <linux/kmod.h>
32 #include <linux/poll.h>
33 #include <linux/init.h>
34 #include <linux/device.h>
35 #include <linux/vmalloc.h>
37 #include "comedidev.h"
38 #include <linux/cdev.h>
39 #include <linux/stat.h>
42 #include <linux/uaccess.h>
44 #include "comedi_internal.h"
47 * comedi_subdevice "runflags"
48 * COMEDI_SRF_RT: DEPRECATED: command is running real-time
49 * COMEDI_SRF_ERROR: indicates an COMEDI_CB_ERROR event has occurred
50 * since the last command was started
51 * COMEDI_SRF_RUNNING: command is running
52 * COMEDI_SRF_FREE_SPRIV: free s->private on detach
54 * COMEDI_SRF_BUSY_MASK: runflags that indicate the subdevice is "busy"
56 #define COMEDI_SRF_RT BIT(1)
57 #define COMEDI_SRF_ERROR BIT(2)
58 #define COMEDI_SRF_RUNNING BIT(27)
59 #define COMEDI_SRF_FREE_SPRIV BIT(31)
61 #define COMEDI_SRF_BUSY_MASK (COMEDI_SRF_ERROR | COMEDI_SRF_RUNNING)
64 * struct comedi_file - Per-file private data for COMEDI device
65 * @dev: COMEDI device.
66 * @read_subdev: Current "read" subdevice.
67 * @write_subdev: Current "write" subdevice.
68 * @last_detach_count: Last known detach count.
69 * @last_attached: Last known attached/detached state.
72 struct comedi_device
*dev
;
73 struct comedi_subdevice
*read_subdev
;
74 struct comedi_subdevice
*write_subdev
;
75 unsigned int last_detach_count
;
79 #define COMEDI_NUM_MINORS 0x100
80 #define COMEDI_NUM_SUBDEVICE_MINORS \
81 (COMEDI_NUM_MINORS - COMEDI_NUM_BOARD_MINORS)
83 static int comedi_num_legacy_minors
;
84 module_param(comedi_num_legacy_minors
, int, S_IRUGO
);
85 MODULE_PARM_DESC(comedi_num_legacy_minors
,
86 "number of comedi minor devices to reserve for non-auto-configured devices (default 0)"
89 unsigned int comedi_default_buf_size_kb
= CONFIG_COMEDI_DEFAULT_BUF_SIZE_KB
;
90 module_param(comedi_default_buf_size_kb
, uint
, S_IRUGO
| S_IWUSR
);
91 MODULE_PARM_DESC(comedi_default_buf_size_kb
,
92 "default asynchronous buffer size in KiB (default "
93 __MODULE_STRING(CONFIG_COMEDI_DEFAULT_BUF_SIZE_KB
) ")");
95 unsigned int comedi_default_buf_maxsize_kb
96 = CONFIG_COMEDI_DEFAULT_BUF_MAXSIZE_KB
;
97 module_param(comedi_default_buf_maxsize_kb
, uint
, S_IRUGO
| S_IWUSR
);
98 MODULE_PARM_DESC(comedi_default_buf_maxsize_kb
,
99 "default maximum size of asynchronous buffer in KiB (default "
100 __MODULE_STRING(CONFIG_COMEDI_DEFAULT_BUF_MAXSIZE_KB
) ")");
102 static DEFINE_MUTEX(comedi_board_minor_table_lock
);
103 static struct comedi_device
104 *comedi_board_minor_table
[COMEDI_NUM_BOARD_MINORS
];
106 static DEFINE_MUTEX(comedi_subdevice_minor_table_lock
);
107 /* Note: indexed by minor - COMEDI_NUM_BOARD_MINORS. */
108 static struct comedi_subdevice
109 *comedi_subdevice_minor_table
[COMEDI_NUM_SUBDEVICE_MINORS
];
111 static struct class *comedi_class
;
112 static struct cdev comedi_cdev
;
114 static void comedi_device_init(struct comedi_device
*dev
)
116 kref_init(&dev
->refcount
);
117 spin_lock_init(&dev
->spinlock
);
118 mutex_init(&dev
->mutex
);
119 init_rwsem(&dev
->attach_lock
);
123 static void comedi_dev_kref_release(struct kref
*kref
)
125 struct comedi_device
*dev
=
126 container_of(kref
, struct comedi_device
, refcount
);
128 mutex_destroy(&dev
->mutex
);
129 put_device(dev
->class_dev
);
134 * comedi_dev_put() - Release a use of a COMEDI device
135 * @dev: COMEDI device.
137 * Must be called when a user of a COMEDI device is finished with it.
138 * When the last user of the COMEDI device calls this function, the
139 * COMEDI device is destroyed.
141 * Return: 1 if the COMEDI device is destroyed by this call or @dev is
142 * NULL, otherwise return 0. Callers must not assume the COMEDI
143 * device is still valid if this function returns 0.
145 int comedi_dev_put(struct comedi_device
*dev
)
148 return kref_put(&dev
->refcount
, comedi_dev_kref_release
);
151 EXPORT_SYMBOL_GPL(comedi_dev_put
);
153 static struct comedi_device
*comedi_dev_get(struct comedi_device
*dev
)
156 kref_get(&dev
->refcount
);
160 static void comedi_device_cleanup(struct comedi_device
*dev
)
162 struct module
*driver_module
= NULL
;
166 mutex_lock(&dev
->mutex
);
168 driver_module
= dev
->driver
->module
;
169 comedi_device_detach(dev
);
170 if (driver_module
&& dev
->use_count
)
171 module_put(driver_module
);
172 mutex_unlock(&dev
->mutex
);
175 static bool comedi_clear_board_dev(struct comedi_device
*dev
)
177 unsigned int i
= dev
->minor
;
178 bool cleared
= false;
180 mutex_lock(&comedi_board_minor_table_lock
);
181 if (dev
== comedi_board_minor_table
[i
]) {
182 comedi_board_minor_table
[i
] = NULL
;
185 mutex_unlock(&comedi_board_minor_table_lock
);
189 static struct comedi_device
*comedi_clear_board_minor(unsigned int minor
)
191 struct comedi_device
*dev
;
193 mutex_lock(&comedi_board_minor_table_lock
);
194 dev
= comedi_board_minor_table
[minor
];
195 comedi_board_minor_table
[minor
] = NULL
;
196 mutex_unlock(&comedi_board_minor_table_lock
);
200 static void comedi_free_board_dev(struct comedi_device
*dev
)
203 comedi_device_cleanup(dev
);
204 if (dev
->class_dev
) {
205 device_destroy(comedi_class
,
206 MKDEV(COMEDI_MAJOR
, dev
->minor
));
212 static struct comedi_subdevice
*
213 comedi_subdevice_from_minor(const struct comedi_device
*dev
, unsigned int minor
)
215 struct comedi_subdevice
*s
;
216 unsigned int i
= minor
- COMEDI_NUM_BOARD_MINORS
;
218 mutex_lock(&comedi_subdevice_minor_table_lock
);
219 s
= comedi_subdevice_minor_table
[i
];
220 if (s
&& s
->device
!= dev
)
222 mutex_unlock(&comedi_subdevice_minor_table_lock
);
226 static struct comedi_device
*comedi_dev_get_from_board_minor(unsigned int minor
)
228 struct comedi_device
*dev
;
230 mutex_lock(&comedi_board_minor_table_lock
);
231 dev
= comedi_dev_get(comedi_board_minor_table
[minor
]);
232 mutex_unlock(&comedi_board_minor_table_lock
);
236 static struct comedi_device
*
237 comedi_dev_get_from_subdevice_minor(unsigned int minor
)
239 struct comedi_device
*dev
;
240 struct comedi_subdevice
*s
;
241 unsigned int i
= minor
- COMEDI_NUM_BOARD_MINORS
;
243 mutex_lock(&comedi_subdevice_minor_table_lock
);
244 s
= comedi_subdevice_minor_table
[i
];
245 dev
= comedi_dev_get(s
? s
->device
: NULL
);
246 mutex_unlock(&comedi_subdevice_minor_table_lock
);
251 * comedi_dev_get_from_minor() - Get COMEDI device by minor device number
252 * @minor: Minor device number.
254 * Finds the COMEDI device associated with the minor device number, if any,
255 * and increments its reference count. The COMEDI device is prevented from
256 * being freed until a matching call is made to comedi_dev_put().
258 * Return: A pointer to the COMEDI device if it exists, with its usage
259 * reference incremented. Return NULL if no COMEDI device exists with the
260 * specified minor device number.
262 struct comedi_device
*comedi_dev_get_from_minor(unsigned int minor
)
264 if (minor
< COMEDI_NUM_BOARD_MINORS
)
265 return comedi_dev_get_from_board_minor(minor
);
267 return comedi_dev_get_from_subdevice_minor(minor
);
269 EXPORT_SYMBOL_GPL(comedi_dev_get_from_minor
);
271 static struct comedi_subdevice
*
272 comedi_read_subdevice(const struct comedi_device
*dev
, unsigned int minor
)
274 struct comedi_subdevice
*s
;
276 if (minor
>= COMEDI_NUM_BOARD_MINORS
) {
277 s
= comedi_subdevice_from_minor(dev
, minor
);
278 if (!s
|| (s
->subdev_flags
& SDF_CMD_READ
))
281 return dev
->read_subdev
;
284 static struct comedi_subdevice
*
285 comedi_write_subdevice(const struct comedi_device
*dev
, unsigned int minor
)
287 struct comedi_subdevice
*s
;
289 if (minor
>= COMEDI_NUM_BOARD_MINORS
) {
290 s
= comedi_subdevice_from_minor(dev
, minor
);
291 if (!s
|| (s
->subdev_flags
& SDF_CMD_WRITE
))
294 return dev
->write_subdev
;
297 static void comedi_file_reset(struct file
*file
)
299 struct comedi_file
*cfp
= file
->private_data
;
300 struct comedi_device
*dev
= cfp
->dev
;
301 struct comedi_subdevice
*s
, *read_s
, *write_s
;
302 unsigned int minor
= iminor(file_inode(file
));
304 read_s
= dev
->read_subdev
;
305 write_s
= dev
->write_subdev
;
306 if (minor
>= COMEDI_NUM_BOARD_MINORS
) {
307 s
= comedi_subdevice_from_minor(dev
, minor
);
308 if (!s
|| s
->subdev_flags
& SDF_CMD_READ
)
310 if (!s
|| s
->subdev_flags
& SDF_CMD_WRITE
)
313 cfp
->last_attached
= dev
->attached
;
314 cfp
->last_detach_count
= dev
->detach_count
;
315 WRITE_ONCE(cfp
->read_subdev
, read_s
);
316 WRITE_ONCE(cfp
->write_subdev
, write_s
);
319 static void comedi_file_check(struct file
*file
)
321 struct comedi_file
*cfp
= file
->private_data
;
322 struct comedi_device
*dev
= cfp
->dev
;
324 if (cfp
->last_attached
!= dev
->attached
||
325 cfp
->last_detach_count
!= dev
->detach_count
)
326 comedi_file_reset(file
);
329 static struct comedi_subdevice
*comedi_file_read_subdevice(struct file
*file
)
331 struct comedi_file
*cfp
= file
->private_data
;
333 comedi_file_check(file
);
334 return READ_ONCE(cfp
->read_subdev
);
337 static struct comedi_subdevice
*comedi_file_write_subdevice(struct file
*file
)
339 struct comedi_file
*cfp
= file
->private_data
;
341 comedi_file_check(file
);
342 return READ_ONCE(cfp
->write_subdev
);
345 static int resize_async_buffer(struct comedi_device
*dev
,
346 struct comedi_subdevice
*s
,
347 unsigned int new_size
)
349 struct comedi_async
*async
= s
->async
;
352 if (new_size
> async
->max_bufsize
)
356 dev_dbg(dev
->class_dev
,
357 "subdevice is busy, cannot resize buffer\n");
360 if (comedi_buf_is_mmapped(s
)) {
361 dev_dbg(dev
->class_dev
,
362 "subdevice is mmapped, cannot resize buffer\n");
366 /* make sure buffer is an integral number of pages (we round up) */
367 new_size
= (new_size
+ PAGE_SIZE
- 1) & PAGE_MASK
;
369 retval
= comedi_buf_alloc(dev
, s
, new_size
);
374 retval
= s
->buf_change(dev
, s
);
379 dev_dbg(dev
->class_dev
, "subd %d buffer resized to %i bytes\n",
380 s
->index
, async
->prealloc_bufsz
);
384 /* sysfs attribute files */
386 static ssize_t
max_read_buffer_kb_show(struct device
*csdev
,
387 struct device_attribute
*attr
, char *buf
)
389 unsigned int minor
= MINOR(csdev
->devt
);
390 struct comedi_device
*dev
;
391 struct comedi_subdevice
*s
;
392 unsigned int size
= 0;
394 dev
= comedi_dev_get_from_minor(minor
);
398 mutex_lock(&dev
->mutex
);
399 s
= comedi_read_subdevice(dev
, minor
);
400 if (s
&& (s
->subdev_flags
& SDF_CMD_READ
) && s
->async
)
401 size
= s
->async
->max_bufsize
/ 1024;
402 mutex_unlock(&dev
->mutex
);
405 return snprintf(buf
, PAGE_SIZE
, "%u\n", size
);
408 static ssize_t
max_read_buffer_kb_store(struct device
*csdev
,
409 struct device_attribute
*attr
,
410 const char *buf
, size_t count
)
412 unsigned int minor
= MINOR(csdev
->devt
);
413 struct comedi_device
*dev
;
414 struct comedi_subdevice
*s
;
418 err
= kstrtouint(buf
, 10, &size
);
421 if (size
> (UINT_MAX
/ 1024))
425 dev
= comedi_dev_get_from_minor(minor
);
429 mutex_lock(&dev
->mutex
);
430 s
= comedi_read_subdevice(dev
, minor
);
431 if (s
&& (s
->subdev_flags
& SDF_CMD_READ
) && s
->async
)
432 s
->async
->max_bufsize
= size
;
435 mutex_unlock(&dev
->mutex
);
438 return err
? err
: count
;
440 static DEVICE_ATTR_RW(max_read_buffer_kb
);
442 static ssize_t
read_buffer_kb_show(struct device
*csdev
,
443 struct device_attribute
*attr
, char *buf
)
445 unsigned int minor
= MINOR(csdev
->devt
);
446 struct comedi_device
*dev
;
447 struct comedi_subdevice
*s
;
448 unsigned int size
= 0;
450 dev
= comedi_dev_get_from_minor(minor
);
454 mutex_lock(&dev
->mutex
);
455 s
= comedi_read_subdevice(dev
, minor
);
456 if (s
&& (s
->subdev_flags
& SDF_CMD_READ
) && s
->async
)
457 size
= s
->async
->prealloc_bufsz
/ 1024;
458 mutex_unlock(&dev
->mutex
);
461 return snprintf(buf
, PAGE_SIZE
, "%u\n", size
);
464 static ssize_t
read_buffer_kb_store(struct device
*csdev
,
465 struct device_attribute
*attr
,
466 const char *buf
, size_t count
)
468 unsigned int minor
= MINOR(csdev
->devt
);
469 struct comedi_device
*dev
;
470 struct comedi_subdevice
*s
;
474 err
= kstrtouint(buf
, 10, &size
);
477 if (size
> (UINT_MAX
/ 1024))
481 dev
= comedi_dev_get_from_minor(minor
);
485 mutex_lock(&dev
->mutex
);
486 s
= comedi_read_subdevice(dev
, minor
);
487 if (s
&& (s
->subdev_flags
& SDF_CMD_READ
) && s
->async
)
488 err
= resize_async_buffer(dev
, s
, size
);
491 mutex_unlock(&dev
->mutex
);
494 return err
? err
: count
;
496 static DEVICE_ATTR_RW(read_buffer_kb
);
498 static ssize_t
max_write_buffer_kb_show(struct device
*csdev
,
499 struct device_attribute
*attr
,
502 unsigned int minor
= MINOR(csdev
->devt
);
503 struct comedi_device
*dev
;
504 struct comedi_subdevice
*s
;
505 unsigned int size
= 0;
507 dev
= comedi_dev_get_from_minor(minor
);
511 mutex_lock(&dev
->mutex
);
512 s
= comedi_write_subdevice(dev
, minor
);
513 if (s
&& (s
->subdev_flags
& SDF_CMD_WRITE
) && s
->async
)
514 size
= s
->async
->max_bufsize
/ 1024;
515 mutex_unlock(&dev
->mutex
);
518 return snprintf(buf
, PAGE_SIZE
, "%u\n", size
);
521 static ssize_t
max_write_buffer_kb_store(struct device
*csdev
,
522 struct device_attribute
*attr
,
523 const char *buf
, size_t count
)
525 unsigned int minor
= MINOR(csdev
->devt
);
526 struct comedi_device
*dev
;
527 struct comedi_subdevice
*s
;
531 err
= kstrtouint(buf
, 10, &size
);
534 if (size
> (UINT_MAX
/ 1024))
538 dev
= comedi_dev_get_from_minor(minor
);
542 mutex_lock(&dev
->mutex
);
543 s
= comedi_write_subdevice(dev
, minor
);
544 if (s
&& (s
->subdev_flags
& SDF_CMD_WRITE
) && s
->async
)
545 s
->async
->max_bufsize
= size
;
548 mutex_unlock(&dev
->mutex
);
551 return err
? err
: count
;
553 static DEVICE_ATTR_RW(max_write_buffer_kb
);
555 static ssize_t
write_buffer_kb_show(struct device
*csdev
,
556 struct device_attribute
*attr
, char *buf
)
558 unsigned int minor
= MINOR(csdev
->devt
);
559 struct comedi_device
*dev
;
560 struct comedi_subdevice
*s
;
561 unsigned int size
= 0;
563 dev
= comedi_dev_get_from_minor(minor
);
567 mutex_lock(&dev
->mutex
);
568 s
= comedi_write_subdevice(dev
, minor
);
569 if (s
&& (s
->subdev_flags
& SDF_CMD_WRITE
) && s
->async
)
570 size
= s
->async
->prealloc_bufsz
/ 1024;
571 mutex_unlock(&dev
->mutex
);
574 return snprintf(buf
, PAGE_SIZE
, "%u\n", size
);
577 static ssize_t
write_buffer_kb_store(struct device
*csdev
,
578 struct device_attribute
*attr
,
579 const char *buf
, size_t count
)
581 unsigned int minor
= MINOR(csdev
->devt
);
582 struct comedi_device
*dev
;
583 struct comedi_subdevice
*s
;
587 err
= kstrtouint(buf
, 10, &size
);
590 if (size
> (UINT_MAX
/ 1024))
594 dev
= comedi_dev_get_from_minor(minor
);
598 mutex_lock(&dev
->mutex
);
599 s
= comedi_write_subdevice(dev
, minor
);
600 if (s
&& (s
->subdev_flags
& SDF_CMD_WRITE
) && s
->async
)
601 err
= resize_async_buffer(dev
, s
, size
);
604 mutex_unlock(&dev
->mutex
);
607 return err
? err
: count
;
609 static DEVICE_ATTR_RW(write_buffer_kb
);
611 static struct attribute
*comedi_dev_attrs
[] = {
612 &dev_attr_max_read_buffer_kb
.attr
,
613 &dev_attr_read_buffer_kb
.attr
,
614 &dev_attr_max_write_buffer_kb
.attr
,
615 &dev_attr_write_buffer_kb
.attr
,
618 ATTRIBUTE_GROUPS(comedi_dev
);
620 static void __comedi_clear_subdevice_runflags(struct comedi_subdevice
*s
,
623 s
->runflags
&= ~bits
;
626 static void __comedi_set_subdevice_runflags(struct comedi_subdevice
*s
,
632 static void comedi_update_subdevice_runflags(struct comedi_subdevice
*s
,
638 spin_lock_irqsave(&s
->spin_lock
, flags
);
639 __comedi_clear_subdevice_runflags(s
, mask
);
640 __comedi_set_subdevice_runflags(s
, bits
& mask
);
641 spin_unlock_irqrestore(&s
->spin_lock
, flags
);
644 static unsigned int __comedi_get_subdevice_runflags(struct comedi_subdevice
*s
)
649 static unsigned int comedi_get_subdevice_runflags(struct comedi_subdevice
*s
)
652 unsigned int runflags
;
654 spin_lock_irqsave(&s
->spin_lock
, flags
);
655 runflags
= __comedi_get_subdevice_runflags(s
);
656 spin_unlock_irqrestore(&s
->spin_lock
, flags
);
660 static bool comedi_is_runflags_running(unsigned int runflags
)
662 return runflags
& COMEDI_SRF_RUNNING
;
665 static bool comedi_is_runflags_in_error(unsigned int runflags
)
667 return runflags
& COMEDI_SRF_ERROR
;
671 * comedi_is_subdevice_running() - Check if async command running on subdevice
672 * @s: COMEDI subdevice.
674 * Return: %true if an asynchronous COMEDI command is active on the
675 * subdevice, else %false.
677 bool comedi_is_subdevice_running(struct comedi_subdevice
*s
)
679 unsigned int runflags
= comedi_get_subdevice_runflags(s
);
681 return comedi_is_runflags_running(runflags
);
683 EXPORT_SYMBOL_GPL(comedi_is_subdevice_running
);
685 static bool __comedi_is_subdevice_running(struct comedi_subdevice
*s
)
687 unsigned int runflags
= __comedi_get_subdevice_runflags(s
);
689 return comedi_is_runflags_running(runflags
);
692 bool comedi_can_auto_free_spriv(struct comedi_subdevice
*s
)
694 unsigned int runflags
= __comedi_get_subdevice_runflags(s
);
696 return runflags
& COMEDI_SRF_FREE_SPRIV
;
700 * comedi_set_spriv_auto_free() - Mark subdevice private data as freeable
701 * @s: COMEDI subdevice.
703 * Mark the subdevice as having a pointer to private data that can be
704 * automatically freed when the COMEDI device is detached from the low-level
707 void comedi_set_spriv_auto_free(struct comedi_subdevice
*s
)
709 __comedi_set_subdevice_runflags(s
, COMEDI_SRF_FREE_SPRIV
);
711 EXPORT_SYMBOL_GPL(comedi_set_spriv_auto_free
);
714 * comedi_alloc_spriv - Allocate memory for the subdevice private data
715 * @s: COMEDI subdevice.
716 * @size: Size of the memory to allocate.
718 * Allocate memory for the subdevice private data and point @s->private
719 * to it. The memory will be freed automatically when the COMEDI device
720 * is detached from the low-level driver.
722 * Return: A pointer to the allocated memory @s->private on success.
723 * Return NULL on failure.
725 void *comedi_alloc_spriv(struct comedi_subdevice
*s
, size_t size
)
727 s
->private = kzalloc(size
, GFP_KERNEL
);
729 comedi_set_spriv_auto_free(s
);
732 EXPORT_SYMBOL_GPL(comedi_alloc_spriv
);
735 * This function restores a subdevice to an idle state.
737 static void do_become_nonbusy(struct comedi_device
*dev
,
738 struct comedi_subdevice
*s
)
740 struct comedi_async
*async
= s
->async
;
742 comedi_update_subdevice_runflags(s
, COMEDI_SRF_RUNNING
, 0);
745 async
->inttrig
= NULL
;
746 kfree(async
->cmd
.chanlist
);
747 async
->cmd
.chanlist
= NULL
;
749 wake_up_interruptible_all(&async
->wait_head
);
751 dev_err(dev
->class_dev
,
752 "BUG: (?) do_become_nonbusy called with async=NULL\n");
757 static int do_cancel(struct comedi_device
*dev
, struct comedi_subdevice
*s
)
761 if (comedi_is_subdevice_running(s
) && s
->cancel
)
762 ret
= s
->cancel(dev
, s
);
764 do_become_nonbusy(dev
, s
);
769 void comedi_device_cancel_all(struct comedi_device
*dev
)
771 struct comedi_subdevice
*s
;
777 for (i
= 0; i
< dev
->n_subdevices
; i
++) {
778 s
= &dev
->subdevices
[i
];
784 static int is_device_busy(struct comedi_device
*dev
)
786 struct comedi_subdevice
*s
;
792 for (i
= 0; i
< dev
->n_subdevices
; i
++) {
793 s
= &dev
->subdevices
[i
];
796 if (s
->async
&& comedi_buf_is_mmapped(s
))
804 * COMEDI_DEVCONFIG ioctl
805 * attaches (and configures) or detaches a legacy device
808 * pointer to comedi_devconfig structure (NULL if detaching)
811 * comedi_devconfig structure (if attaching)
816 static int do_devconfig_ioctl(struct comedi_device
*dev
,
817 struct comedi_devconfig __user
*arg
)
819 struct comedi_devconfig it
;
821 if (!capable(CAP_SYS_ADMIN
))
825 if (is_device_busy(dev
))
828 struct module
*driver_module
= dev
->driver
->module
;
830 comedi_device_detach(dev
);
831 module_put(driver_module
);
836 if (copy_from_user(&it
, arg
, sizeof(it
)))
839 it
.board_name
[COMEDI_NAMELEN
- 1] = 0;
841 if (it
.options
[COMEDI_DEVCONF_AUX_DATA_LENGTH
]) {
842 dev_warn(dev
->class_dev
,
843 "comedi_config --init_data is deprecated\n");
847 if (dev
->minor
>= comedi_num_legacy_minors
)
848 /* don't re-use dynamically allocated comedi devices */
851 /* This increments the driver module count on success. */
852 return comedi_device_attach(dev
, &it
);
856 * COMEDI_BUFCONFIG ioctl
857 * buffer configuration
860 * pointer to comedi_bufconfig structure
863 * comedi_bufconfig structure
866 * modified comedi_bufconfig structure
868 static int do_bufconfig_ioctl(struct comedi_device
*dev
,
869 struct comedi_bufconfig __user
*arg
)
871 struct comedi_bufconfig bc
;
872 struct comedi_async
*async
;
873 struct comedi_subdevice
*s
;
876 if (copy_from_user(&bc
, arg
, sizeof(bc
)))
879 if (bc
.subdevice
>= dev
->n_subdevices
)
882 s
= &dev
->subdevices
[bc
.subdevice
];
886 dev_dbg(dev
->class_dev
,
887 "subdevice does not have async capability\n");
893 if (bc
.maximum_size
) {
894 if (!capable(CAP_SYS_ADMIN
))
897 async
->max_bufsize
= bc
.maximum_size
;
901 retval
= resize_async_buffer(dev
, s
, bc
.size
);
906 bc
.size
= async
->prealloc_bufsz
;
907 bc
.maximum_size
= async
->max_bufsize
;
910 if (copy_to_user(arg
, &bc
, sizeof(bc
)))
917 * COMEDI_DEVINFO ioctl
921 * pointer to comedi_devinfo structure
927 * comedi_devinfo structure
929 static int do_devinfo_ioctl(struct comedi_device
*dev
,
930 struct comedi_devinfo __user
*arg
,
933 struct comedi_subdevice
*s
;
934 struct comedi_devinfo devinfo
;
936 memset(&devinfo
, 0, sizeof(devinfo
));
938 /* fill devinfo structure */
939 devinfo
.version_code
= COMEDI_VERSION_CODE
;
940 devinfo
.n_subdevs
= dev
->n_subdevices
;
941 strlcpy(devinfo
.driver_name
, dev
->driver
->driver_name
, COMEDI_NAMELEN
);
942 strlcpy(devinfo
.board_name
, dev
->board_name
, COMEDI_NAMELEN
);
944 s
= comedi_file_read_subdevice(file
);
946 devinfo
.read_subdevice
= s
->index
;
948 devinfo
.read_subdevice
= -1;
950 s
= comedi_file_write_subdevice(file
);
952 devinfo
.write_subdevice
= s
->index
;
954 devinfo
.write_subdevice
= -1;
956 if (copy_to_user(arg
, &devinfo
, sizeof(devinfo
)))
963 * COMEDI_SUBDINFO ioctl
967 * pointer to array of comedi_subdinfo structures
973 * array of comedi_subdinfo structures
975 static int do_subdinfo_ioctl(struct comedi_device
*dev
,
976 struct comedi_subdinfo __user
*arg
, void *file
)
979 struct comedi_subdinfo
*tmp
, *us
;
980 struct comedi_subdevice
*s
;
982 tmp
= kcalloc(dev
->n_subdevices
, sizeof(*tmp
), GFP_KERNEL
);
986 /* fill subdinfo structs */
987 for (i
= 0; i
< dev
->n_subdevices
; i
++) {
988 s
= &dev
->subdevices
[i
];
992 us
->n_chan
= s
->n_chan
;
993 us
->subd_flags
= s
->subdev_flags
;
994 if (comedi_is_subdevice_running(s
))
995 us
->subd_flags
|= SDF_RUNNING
;
996 #define TIMER_nanosec 5 /* backwards compatibility */
997 us
->timer_type
= TIMER_nanosec
;
998 us
->len_chanlist
= s
->len_chanlist
;
999 us
->maxdata
= s
->maxdata
;
1000 if (s
->range_table
) {
1002 (i
<< 24) | (0 << 16) | (s
->range_table
->length
);
1004 us
->range_type
= 0; /* XXX */
1008 us
->subd_flags
|= SDF_BUSY
;
1009 if (s
->busy
== file
)
1010 us
->subd_flags
|= SDF_BUSY_OWNER
;
1012 us
->subd_flags
|= SDF_LOCKED
;
1013 if (s
->lock
== file
)
1014 us
->subd_flags
|= SDF_LOCK_OWNER
;
1015 if (!s
->maxdata
&& s
->maxdata_list
)
1016 us
->subd_flags
|= SDF_MAXDATA
;
1017 if (s
->range_table_list
)
1018 us
->subd_flags
|= SDF_RANGETYPE
;
1020 us
->subd_flags
|= SDF_CMD
;
1022 if (s
->insn_bits
!= &insn_inval
)
1023 us
->insn_bits_support
= COMEDI_SUPPORTED
;
1025 us
->insn_bits_support
= COMEDI_UNSUPPORTED
;
1028 ret
= copy_to_user(arg
, tmp
, dev
->n_subdevices
* sizeof(*tmp
));
1032 return ret
? -EFAULT
: 0;
1036 * COMEDI_CHANINFO ioctl
1037 * subdevice channel info
1040 * pointer to comedi_chaninfo structure
1043 * comedi_chaninfo structure
1046 * array of maxdata values to chaninfo->maxdata_list if requested
1047 * array of range table lengths to chaninfo->range_table_list if requested
1049 static int do_chaninfo_ioctl(struct comedi_device
*dev
,
1050 struct comedi_chaninfo __user
*arg
)
1052 struct comedi_subdevice
*s
;
1053 struct comedi_chaninfo it
;
1055 if (copy_from_user(&it
, arg
, sizeof(it
)))
1058 if (it
.subdev
>= dev
->n_subdevices
)
1060 s
= &dev
->subdevices
[it
.subdev
];
1062 if (it
.maxdata_list
) {
1063 if (s
->maxdata
|| !s
->maxdata_list
)
1065 if (copy_to_user(it
.maxdata_list
, s
->maxdata_list
,
1066 s
->n_chan
* sizeof(unsigned int)))
1071 return -EINVAL
; /* flaglist not supported */
1076 if (!s
->range_table_list
)
1078 for (i
= 0; i
< s
->n_chan
; i
++) {
1081 x
= (dev
->minor
<< 28) | (it
.subdev
<< 24) | (i
<< 16) |
1082 (s
->range_table_list
[i
]->length
);
1083 if (put_user(x
, it
.rangelist
+ i
))
1092 * COMEDI_BUFINFO ioctl
1093 * buffer information
1096 * pointer to comedi_bufinfo structure
1099 * comedi_bufinfo structure
1102 * modified comedi_bufinfo structure
1104 static int do_bufinfo_ioctl(struct comedi_device
*dev
,
1105 struct comedi_bufinfo __user
*arg
, void *file
)
1107 struct comedi_bufinfo bi
;
1108 struct comedi_subdevice
*s
;
1109 struct comedi_async
*async
;
1110 unsigned int runflags
;
1112 bool become_nonbusy
= false;
1114 if (copy_from_user(&bi
, arg
, sizeof(bi
)))
1117 if (bi
.subdevice
>= dev
->n_subdevices
)
1120 s
= &dev
->subdevices
[bi
.subdevice
];
1124 if (!async
|| s
->busy
!= file
)
1127 runflags
= comedi_get_subdevice_runflags(s
);
1128 if (!(async
->cmd
.flags
& CMDF_WRITE
)) {
1129 /* command was set up in "read" direction */
1130 if (bi
.bytes_read
) {
1131 comedi_buf_read_alloc(s
, bi
.bytes_read
);
1132 bi
.bytes_read
= comedi_buf_read_free(s
, bi
.bytes_read
);
1135 * If nothing left to read, and command has stopped, and
1136 * {"read" position not updated or command stopped normally},
1137 * then become non-busy.
1139 if (comedi_buf_read_n_available(s
) == 0 &&
1140 !comedi_is_runflags_running(runflags
) &&
1141 (bi
.bytes_read
== 0 ||
1142 !comedi_is_runflags_in_error(runflags
))) {
1143 become_nonbusy
= true;
1144 if (comedi_is_runflags_in_error(runflags
))
1147 bi
.bytes_written
= 0;
1149 /* command was set up in "write" direction */
1150 if (!comedi_is_runflags_running(runflags
)) {
1151 bi
.bytes_written
= 0;
1152 become_nonbusy
= true;
1153 if (comedi_is_runflags_in_error(runflags
))
1155 } else if (bi
.bytes_written
) {
1156 comedi_buf_write_alloc(s
, bi
.bytes_written
);
1158 comedi_buf_write_free(s
, bi
.bytes_written
);
1163 bi
.buf_write_count
= async
->buf_write_count
;
1164 bi
.buf_write_ptr
= async
->buf_write_ptr
;
1165 bi
.buf_read_count
= async
->buf_read_count
;
1166 bi
.buf_read_ptr
= async
->buf_read_ptr
;
1169 do_become_nonbusy(dev
, s
);
1174 if (copy_to_user(arg
, &bi
, sizeof(bi
)))
1180 static int check_insn_config_length(struct comedi_insn
*insn
,
1187 case INSN_CONFIG_DIO_OUTPUT
:
1188 case INSN_CONFIG_DIO_INPUT
:
1189 case INSN_CONFIG_DISARM
:
1190 case INSN_CONFIG_RESET
:
1194 case INSN_CONFIG_ARM
:
1195 case INSN_CONFIG_DIO_QUERY
:
1196 case INSN_CONFIG_BLOCK_SIZE
:
1197 case INSN_CONFIG_FILTER
:
1198 case INSN_CONFIG_SERIAL_CLOCK
:
1199 case INSN_CONFIG_BIDIRECTIONAL_DATA
:
1200 case INSN_CONFIG_ALT_SOURCE
:
1201 case INSN_CONFIG_SET_COUNTER_MODE
:
1202 case INSN_CONFIG_8254_READ_STATUS
:
1203 case INSN_CONFIG_SET_ROUTING
:
1204 case INSN_CONFIG_GET_ROUTING
:
1205 case INSN_CONFIG_GET_PWM_STATUS
:
1206 case INSN_CONFIG_PWM_SET_PERIOD
:
1207 case INSN_CONFIG_PWM_GET_PERIOD
:
1211 case INSN_CONFIG_SET_GATE_SRC
:
1212 case INSN_CONFIG_GET_GATE_SRC
:
1213 case INSN_CONFIG_SET_CLOCK_SRC
:
1214 case INSN_CONFIG_GET_CLOCK_SRC
:
1215 case INSN_CONFIG_SET_OTHER_SRC
:
1216 case INSN_CONFIG_GET_COUNTER_STATUS
:
1217 case INSN_CONFIG_PWM_SET_H_BRIDGE
:
1218 case INSN_CONFIG_PWM_GET_H_BRIDGE
:
1219 case INSN_CONFIG_GET_HARDWARE_BUFFER_SIZE
:
1223 case INSN_CONFIG_PWM_OUTPUT
:
1224 case INSN_CONFIG_ANALOG_TRIG
:
1228 case INSN_CONFIG_DIGITAL_TRIG
:
1233 * by default we allow the insn since we don't have checks for
1234 * all possible cases yet
1237 pr_warn("No check for data length of config insn id %i is implemented\n",
1239 pr_warn("Add a check to %s in %s\n", __func__
, __FILE__
);
1240 pr_warn("Assuming n=%i is correct\n", insn
->n
);
1246 static int parse_insn(struct comedi_device
*dev
, struct comedi_insn
*insn
,
1247 unsigned int *data
, void *file
)
1249 struct comedi_subdevice
*s
;
1253 if (insn
->insn
& INSN_MASK_SPECIAL
) {
1254 /* a non-subdevice instruction */
1256 switch (insn
->insn
) {
1259 struct timespec64 tv
;
1266 ktime_get_real_ts64(&tv
);
1267 /* unsigned data safe until 2106 */
1268 data
[0] = (unsigned int)tv
.tv_sec
;
1269 data
[1] = tv
.tv_nsec
/ NSEC_PER_USEC
;
1275 if (insn
->n
!= 1 || data
[0] >= 100000) {
1279 udelay(data
[0] / 1000);
1287 if (insn
->subdev
>= dev
->n_subdevices
) {
1288 dev_dbg(dev
->class_dev
,
1289 "%d not usable subdevice\n",
1294 s
= &dev
->subdevices
[insn
->subdev
];
1296 dev_dbg(dev
->class_dev
, "no async\n");
1300 if (!s
->async
->inttrig
) {
1301 dev_dbg(dev
->class_dev
, "no inttrig\n");
1305 ret
= s
->async
->inttrig(dev
, s
, data
[0]);
1310 dev_dbg(dev
->class_dev
, "invalid insn\n");
1315 /* a subdevice instruction */
1316 unsigned int maxdata
;
1318 if (insn
->subdev
>= dev
->n_subdevices
) {
1319 dev_dbg(dev
->class_dev
, "subdevice %d out of range\n",
1324 s
= &dev
->subdevices
[insn
->subdev
];
1326 if (s
->type
== COMEDI_SUBD_UNUSED
) {
1327 dev_dbg(dev
->class_dev
, "%d not usable subdevice\n",
1333 /* are we locked? (ioctl lock) */
1334 if (s
->lock
&& s
->lock
!= file
) {
1335 dev_dbg(dev
->class_dev
, "device locked\n");
1340 ret
= comedi_check_chanlist(s
, 1, &insn
->chanspec
);
1343 dev_dbg(dev
->class_dev
, "bad chanspec\n");
1351 /* This looks arbitrary. It is. */
1352 s
->busy
= parse_insn
;
1353 switch (insn
->insn
) {
1355 ret
= s
->insn_read(dev
, s
, insn
, data
);
1356 if (ret
== -ETIMEDOUT
) {
1357 dev_dbg(dev
->class_dev
,
1358 "subdevice %d read instruction timed out\n",
1363 maxdata
= s
->maxdata_list
1364 ? s
->maxdata_list
[CR_CHAN(insn
->chanspec
)]
1366 for (i
= 0; i
< insn
->n
; ++i
) {
1367 if (data
[i
] > maxdata
) {
1369 dev_dbg(dev
->class_dev
,
1370 "bad data value(s)\n");
1375 ret
= s
->insn_write(dev
, s
, insn
, data
);
1376 if (ret
== -ETIMEDOUT
) {
1377 dev_dbg(dev
->class_dev
,
1378 "subdevice %d write instruction timed out\n",
1388 * Most drivers ignore the base channel in
1389 * insn->chanspec. Fix this here if
1390 * the subdevice has <= 32 channels.
1392 unsigned int orig_mask
= data
[0];
1393 unsigned int shift
= 0;
1395 if (s
->n_chan
<= 32) {
1396 shift
= CR_CHAN(insn
->chanspec
);
1403 ret
= s
->insn_bits(dev
, s
, insn
, data
);
1404 data
[0] = orig_mask
;
1410 ret
= check_insn_config_length(insn
, data
);
1413 ret
= s
->insn_config(dev
, s
, insn
, data
);
1428 * COMEDI_INSNLIST ioctl
1429 * synchronous instruction list
1432 * pointer to comedi_insnlist structure
1435 * comedi_insnlist structure
1436 * array of comedi_insn structures from insnlist->insns pointer
1437 * data (for writes) from insns[].data pointers
1440 * data (for reads) to insns[].data pointers
1442 /* arbitrary limits */
1443 #define MAX_SAMPLES 256
1444 static int do_insnlist_ioctl(struct comedi_device
*dev
,
1445 struct comedi_insnlist __user
*arg
, void *file
)
1447 struct comedi_insnlist insnlist
;
1448 struct comedi_insn
*insns
= NULL
;
1449 unsigned int *data
= NULL
;
1453 if (copy_from_user(&insnlist
, arg
, sizeof(insnlist
)))
1456 data
= kmalloc_array(MAX_SAMPLES
, sizeof(unsigned int), GFP_KERNEL
);
1462 insns
= kcalloc(insnlist
.n_insns
, sizeof(*insns
), GFP_KERNEL
);
1468 if (copy_from_user(insns
, insnlist
.insns
,
1469 sizeof(*insns
) * insnlist
.n_insns
)) {
1470 dev_dbg(dev
->class_dev
, "copy_from_user failed\n");
1475 for (i
= 0; i
< insnlist
.n_insns
; i
++) {
1476 if (insns
[i
].n
> MAX_SAMPLES
) {
1477 dev_dbg(dev
->class_dev
,
1478 "number of samples too large\n");
1482 if (insns
[i
].insn
& INSN_MASK_WRITE
) {
1483 if (copy_from_user(data
, insns
[i
].data
,
1484 insns
[i
].n
* sizeof(unsigned int))) {
1485 dev_dbg(dev
->class_dev
,
1486 "copy_from_user failed\n");
1491 ret
= parse_insn(dev
, insns
+ i
, data
, file
);
1494 if (insns
[i
].insn
& INSN_MASK_READ
) {
1495 if (copy_to_user(insns
[i
].data
, data
,
1496 insns
[i
].n
* sizeof(unsigned int))) {
1497 dev_dbg(dev
->class_dev
,
1498 "copy_to_user failed\n");
1518 * synchronous instruction
1521 * pointer to comedi_insn structure
1524 * comedi_insn structure
1525 * data (for writes) from insn->data pointer
1528 * data (for reads) to insn->data pointer
1530 static int do_insn_ioctl(struct comedi_device
*dev
,
1531 struct comedi_insn __user
*arg
, void *file
)
1533 struct comedi_insn insn
;
1534 unsigned int *data
= NULL
;
1537 data
= kmalloc_array(MAX_SAMPLES
, sizeof(unsigned int), GFP_KERNEL
);
1543 if (copy_from_user(&insn
, arg
, sizeof(insn
))) {
1548 /* This is where the behavior of insn and insnlist deviate. */
1549 if (insn
.n
> MAX_SAMPLES
)
1550 insn
.n
= MAX_SAMPLES
;
1551 if (insn
.insn
& INSN_MASK_WRITE
) {
1552 if (copy_from_user(data
,
1554 insn
.n
* sizeof(unsigned int))) {
1559 ret
= parse_insn(dev
, &insn
, data
, file
);
1562 if (insn
.insn
& INSN_MASK_READ
) {
1563 if (copy_to_user(insn
.data
,
1565 insn
.n
* sizeof(unsigned int))) {
1578 static int __comedi_get_user_cmd(struct comedi_device
*dev
,
1579 struct comedi_cmd __user
*arg
,
1580 struct comedi_cmd
*cmd
)
1582 struct comedi_subdevice
*s
;
1584 if (copy_from_user(cmd
, arg
, sizeof(*cmd
))) {
1585 dev_dbg(dev
->class_dev
, "bad cmd address\n");
1589 if (cmd
->subdev
>= dev
->n_subdevices
) {
1590 dev_dbg(dev
->class_dev
, "%d no such subdevice\n", cmd
->subdev
);
1594 s
= &dev
->subdevices
[cmd
->subdev
];
1596 if (s
->type
== COMEDI_SUBD_UNUSED
) {
1597 dev_dbg(dev
->class_dev
, "%d not valid subdevice\n",
1602 if (!s
->do_cmd
|| !s
->do_cmdtest
|| !s
->async
) {
1603 dev_dbg(dev
->class_dev
,
1604 "subdevice %d does not support commands\n",
1609 /* make sure channel/gain list isn't too long */
1610 if (cmd
->chanlist_len
> s
->len_chanlist
) {
1611 dev_dbg(dev
->class_dev
, "channel/gain list too long %d > %d\n",
1612 cmd
->chanlist_len
, s
->len_chanlist
);
1617 * Set the CMDF_WRITE flag to the correct state if the subdevice
1618 * supports only "read" commands or only "write" commands.
1620 switch (s
->subdev_flags
& (SDF_CMD_READ
| SDF_CMD_WRITE
)) {
1622 cmd
->flags
&= ~CMDF_WRITE
;
1625 cmd
->flags
|= CMDF_WRITE
;
1634 static int __comedi_get_user_chanlist(struct comedi_device
*dev
,
1635 struct comedi_subdevice
*s
,
1636 unsigned int __user
*user_chanlist
,
1637 struct comedi_cmd
*cmd
)
1639 unsigned int *chanlist
;
1642 cmd
->chanlist
= NULL
;
1643 chanlist
= memdup_user(user_chanlist
,
1644 cmd
->chanlist_len
* sizeof(unsigned int));
1645 if (IS_ERR(chanlist
))
1646 return PTR_ERR(chanlist
);
1648 /* make sure each element in channel/gain list is valid */
1649 ret
= comedi_check_chanlist(s
, cmd
->chanlist_len
, chanlist
);
1655 cmd
->chanlist
= chanlist
;
1662 * asynchronous acquisition command set-up
1665 * pointer to comedi_cmd structure
1668 * comedi_cmd structure
1669 * channel/range list from cmd->chanlist pointer
1672 * possibly modified comedi_cmd structure (when -EAGAIN returned)
1674 static int do_cmd_ioctl(struct comedi_device
*dev
,
1675 struct comedi_cmd __user
*arg
, void *file
)
1677 struct comedi_cmd cmd
;
1678 struct comedi_subdevice
*s
;
1679 struct comedi_async
*async
;
1680 unsigned int __user
*user_chanlist
;
1683 /* get the user's cmd and do some simple validation */
1684 ret
= __comedi_get_user_cmd(dev
, arg
, &cmd
);
1688 /* save user's chanlist pointer so it can be restored later */
1689 user_chanlist
= (unsigned int __user
*)cmd
.chanlist
;
1691 s
= &dev
->subdevices
[cmd
.subdev
];
1694 /* are we locked? (ioctl lock) */
1695 if (s
->lock
&& s
->lock
!= file
) {
1696 dev_dbg(dev
->class_dev
, "subdevice locked\n");
1702 dev_dbg(dev
->class_dev
, "subdevice busy\n");
1706 /* make sure channel/gain list isn't too short */
1707 if (cmd
.chanlist_len
< 1) {
1708 dev_dbg(dev
->class_dev
, "channel/gain list too short %u < 1\n",
1714 async
->cmd
.data
= NULL
;
1716 /* load channel/gain list */
1717 ret
= __comedi_get_user_chanlist(dev
, s
, user_chanlist
, &async
->cmd
);
1721 ret
= s
->do_cmdtest(dev
, s
, &async
->cmd
);
1723 if (async
->cmd
.flags
& CMDF_BOGUS
|| ret
) {
1724 dev_dbg(dev
->class_dev
, "test returned %d\n", ret
);
1726 /* restore chanlist pointer before copying back */
1727 cmd
.chanlist
= (unsigned int __force
*)user_chanlist
;
1729 if (copy_to_user(arg
, &cmd
, sizeof(cmd
))) {
1730 dev_dbg(dev
->class_dev
, "fault writing cmd\n");
1738 if (!async
->prealloc_bufsz
) {
1740 dev_dbg(dev
->class_dev
, "no buffer (?)\n");
1744 comedi_buf_reset(s
);
1746 async
->cb_mask
= COMEDI_CB_BLOCK
| COMEDI_CB_CANCEL_MASK
;
1747 if (async
->cmd
.flags
& CMDF_WAKE_EOS
)
1748 async
->cb_mask
|= COMEDI_CB_EOS
;
1750 comedi_update_subdevice_runflags(s
, COMEDI_SRF_BUSY_MASK
,
1751 COMEDI_SRF_RUNNING
);
1754 * Set s->busy _after_ setting COMEDI_SRF_RUNNING flag to avoid
1755 * race with comedi_read() or comedi_write().
1758 ret
= s
->do_cmd(dev
, s
);
1763 do_become_nonbusy(dev
, s
);
1769 * COMEDI_CMDTEST ioctl
1770 * asynchronous acquisition command testing
1773 * pointer to comedi_cmd structure
1776 * comedi_cmd structure
1777 * channel/range list from cmd->chanlist pointer
1780 * possibly modified comedi_cmd structure
1782 static int do_cmdtest_ioctl(struct comedi_device
*dev
,
1783 struct comedi_cmd __user
*arg
, void *file
)
1785 struct comedi_cmd cmd
;
1786 struct comedi_subdevice
*s
;
1787 unsigned int __user
*user_chanlist
;
1790 /* get the user's cmd and do some simple validation */
1791 ret
= __comedi_get_user_cmd(dev
, arg
, &cmd
);
1795 /* save user's chanlist pointer so it can be restored later */
1796 user_chanlist
= (unsigned int __user
*)cmd
.chanlist
;
1798 s
= &dev
->subdevices
[cmd
.subdev
];
1800 /* user_chanlist can be NULL for COMEDI_CMDTEST ioctl */
1801 if (user_chanlist
) {
1802 /* load channel/gain list */
1803 ret
= __comedi_get_user_chanlist(dev
, s
, user_chanlist
, &cmd
);
1808 ret
= s
->do_cmdtest(dev
, s
, &cmd
);
1810 kfree(cmd
.chanlist
); /* free kernel copy of user chanlist */
1812 /* restore chanlist pointer before copying back */
1813 cmd
.chanlist
= (unsigned int __force
*)user_chanlist
;
1815 if (copy_to_user(arg
, &cmd
, sizeof(cmd
))) {
1816 dev_dbg(dev
->class_dev
, "bad cmd address\n");
1836 static int do_lock_ioctl(struct comedi_device
*dev
, unsigned long arg
,
1840 unsigned long flags
;
1841 struct comedi_subdevice
*s
;
1843 if (arg
>= dev
->n_subdevices
)
1845 s
= &dev
->subdevices
[arg
];
1847 spin_lock_irqsave(&s
->spin_lock
, flags
);
1848 if (s
->busy
|| s
->lock
)
1852 spin_unlock_irqrestore(&s
->spin_lock
, flags
);
1858 * COMEDI_UNLOCK ioctl
1870 static int do_unlock_ioctl(struct comedi_device
*dev
, unsigned long arg
,
1873 struct comedi_subdevice
*s
;
1875 if (arg
>= dev
->n_subdevices
)
1877 s
= &dev
->subdevices
[arg
];
1882 if (s
->lock
&& s
->lock
!= file
)
1885 if (s
->lock
== file
)
1892 * COMEDI_CANCEL ioctl
1893 * cancel asynchronous acquisition
1904 static int do_cancel_ioctl(struct comedi_device
*dev
, unsigned long arg
,
1907 struct comedi_subdevice
*s
;
1909 if (arg
>= dev
->n_subdevices
)
1911 s
= &dev
->subdevices
[arg
];
1918 if (s
->busy
!= file
)
1921 return do_cancel(dev
, s
);
1926 * instructs driver to synchronize buffers
1937 static int do_poll_ioctl(struct comedi_device
*dev
, unsigned long arg
,
1940 struct comedi_subdevice
*s
;
1942 if (arg
>= dev
->n_subdevices
)
1944 s
= &dev
->subdevices
[arg
];
1949 if (s
->busy
!= file
)
1953 return s
->poll(dev
, s
);
1959 * COMEDI_SETRSUBD ioctl
1960 * sets the current "read" subdevice on a per-file basis
1971 static int do_setrsubd_ioctl(struct comedi_device
*dev
, unsigned long arg
,
1974 struct comedi_file
*cfp
= file
->private_data
;
1975 struct comedi_subdevice
*s_old
, *s_new
;
1977 if (arg
>= dev
->n_subdevices
)
1980 s_new
= &dev
->subdevices
[arg
];
1981 s_old
= comedi_file_read_subdevice(file
);
1983 return 0; /* no change */
1985 if (!(s_new
->subdev_flags
& SDF_CMD_READ
))
1989 * Check the file isn't still busy handling a "read" command on the
1990 * old subdevice (if any).
1992 if (s_old
&& s_old
->busy
== file
&& s_old
->async
&&
1993 !(s_old
->async
->cmd
.flags
& CMDF_WRITE
))
1996 WRITE_ONCE(cfp
->read_subdev
, s_new
);
2001 * COMEDI_SETWSUBD ioctl
2002 * sets the current "write" subdevice on a per-file basis
2013 static int do_setwsubd_ioctl(struct comedi_device
*dev
, unsigned long arg
,
2016 struct comedi_file
*cfp
= file
->private_data
;
2017 struct comedi_subdevice
*s_old
, *s_new
;
2019 if (arg
>= dev
->n_subdevices
)
2022 s_new
= &dev
->subdevices
[arg
];
2023 s_old
= comedi_file_write_subdevice(file
);
2025 return 0; /* no change */
2027 if (!(s_new
->subdev_flags
& SDF_CMD_WRITE
))
2031 * Check the file isn't still busy handling a "write" command on the
2032 * old subdevice (if any).
2034 if (s_old
&& s_old
->busy
== file
&& s_old
->async
&&
2035 (s_old
->async
->cmd
.flags
& CMDF_WRITE
))
2038 WRITE_ONCE(cfp
->write_subdev
, s_new
);
2042 static long comedi_unlocked_ioctl(struct file
*file
, unsigned int cmd
,
2045 unsigned int minor
= iminor(file_inode(file
));
2046 struct comedi_file
*cfp
= file
->private_data
;
2047 struct comedi_device
*dev
= cfp
->dev
;
2050 mutex_lock(&dev
->mutex
);
2053 * Device config is special, because it must work on
2054 * an unconfigured device.
2056 if (cmd
== COMEDI_DEVCONFIG
) {
2057 if (minor
>= COMEDI_NUM_BOARD_MINORS
) {
2058 /* Device config not appropriate on non-board minors. */
2062 rc
= do_devconfig_ioctl(dev
,
2063 (struct comedi_devconfig __user
*)arg
);
2066 dev
->minor
>= comedi_num_legacy_minors
) {
2068 * Successfully unconfigured a dynamically
2069 * allocated device. Try and remove it.
2071 if (comedi_clear_board_dev(dev
)) {
2072 mutex_unlock(&dev
->mutex
);
2073 comedi_free_board_dev(dev
);
2081 if (!dev
->attached
) {
2082 dev_dbg(dev
->class_dev
, "no driver attached\n");
2088 case COMEDI_BUFCONFIG
:
2089 rc
= do_bufconfig_ioctl(dev
,
2090 (struct comedi_bufconfig __user
*)arg
);
2092 case COMEDI_DEVINFO
:
2093 rc
= do_devinfo_ioctl(dev
, (struct comedi_devinfo __user
*)arg
,
2096 case COMEDI_SUBDINFO
:
2097 rc
= do_subdinfo_ioctl(dev
,
2098 (struct comedi_subdinfo __user
*)arg
,
2101 case COMEDI_CHANINFO
:
2102 rc
= do_chaninfo_ioctl(dev
, (void __user
*)arg
);
2104 case COMEDI_RANGEINFO
:
2105 rc
= do_rangeinfo_ioctl(dev
, (void __user
*)arg
);
2107 case COMEDI_BUFINFO
:
2108 rc
= do_bufinfo_ioctl(dev
,
2109 (struct comedi_bufinfo __user
*)arg
,
2113 rc
= do_lock_ioctl(dev
, arg
, file
);
2116 rc
= do_unlock_ioctl(dev
, arg
, file
);
2119 rc
= do_cancel_ioctl(dev
, arg
, file
);
2122 rc
= do_cmd_ioctl(dev
, (struct comedi_cmd __user
*)arg
, file
);
2124 case COMEDI_CMDTEST
:
2125 rc
= do_cmdtest_ioctl(dev
, (struct comedi_cmd __user
*)arg
,
2128 case COMEDI_INSNLIST
:
2129 rc
= do_insnlist_ioctl(dev
,
2130 (struct comedi_insnlist __user
*)arg
,
2134 rc
= do_insn_ioctl(dev
, (struct comedi_insn __user
*)arg
,
2138 rc
= do_poll_ioctl(dev
, arg
, file
);
2140 case COMEDI_SETRSUBD
:
2141 rc
= do_setrsubd_ioctl(dev
, arg
, file
);
2143 case COMEDI_SETWSUBD
:
2144 rc
= do_setwsubd_ioctl(dev
, arg
, file
);
2152 mutex_unlock(&dev
->mutex
);
2156 static void comedi_vm_open(struct vm_area_struct
*area
)
2158 struct comedi_buf_map
*bm
;
2160 bm
= area
->vm_private_data
;
2161 comedi_buf_map_get(bm
);
2164 static void comedi_vm_close(struct vm_area_struct
*area
)
2166 struct comedi_buf_map
*bm
;
2168 bm
= area
->vm_private_data
;
2169 comedi_buf_map_put(bm
);
2172 static const struct vm_operations_struct comedi_vm_ops
= {
2173 .open
= comedi_vm_open
,
2174 .close
= comedi_vm_close
,
2177 static int comedi_mmap(struct file
*file
, struct vm_area_struct
*vma
)
2179 struct comedi_file
*cfp
= file
->private_data
;
2180 struct comedi_device
*dev
= cfp
->dev
;
2181 struct comedi_subdevice
*s
;
2182 struct comedi_async
*async
;
2183 struct comedi_buf_map
*bm
= NULL
;
2184 unsigned long start
= vma
->vm_start
;
2191 * 'trylock' avoids circular dependency with current->mm->mmap_sem
2192 * and down-reading &dev->attach_lock should normally succeed without
2193 * contention unless the device is in the process of being attached
2196 if (!down_read_trylock(&dev
->attach_lock
))
2199 if (!dev
->attached
) {
2200 dev_dbg(dev
->class_dev
, "no driver attached\n");
2205 if (vma
->vm_flags
& VM_WRITE
)
2206 s
= comedi_file_write_subdevice(file
);
2208 s
= comedi_file_read_subdevice(file
);
2220 if (vma
->vm_pgoff
!= 0) {
2221 dev_dbg(dev
->class_dev
, "mmap() offset must be 0.\n");
2226 size
= vma
->vm_end
- vma
->vm_start
;
2227 if (size
> async
->prealloc_bufsz
) {
2231 if (offset_in_page(size
)) {
2236 n_pages
= size
>> PAGE_SHIFT
;
2238 /* get reference to current buf map (if any) */
2239 bm
= comedi_buf_map_from_subdev_get(s
);
2240 if (!bm
|| n_pages
> bm
->n_pages
) {
2244 for (i
= 0; i
< n_pages
; ++i
) {
2245 struct comedi_buf_page
*buf
= &bm
->page_list
[i
];
2247 if (remap_pfn_range(vma
, start
,
2248 page_to_pfn(virt_to_page(buf
->virt_addr
)),
2249 PAGE_SIZE
, PAGE_SHARED
)) {
2256 vma
->vm_ops
= &comedi_vm_ops
;
2257 vma
->vm_private_data
= bm
;
2259 vma
->vm_ops
->open(vma
);
2263 up_read(&dev
->attach_lock
);
2264 comedi_buf_map_put(bm
); /* put reference to buf map - okay if NULL */
2268 static unsigned int comedi_poll(struct file
*file
, poll_table
*wait
)
2270 unsigned int mask
= 0;
2271 struct comedi_file
*cfp
= file
->private_data
;
2272 struct comedi_device
*dev
= cfp
->dev
;
2273 struct comedi_subdevice
*s
, *s_read
;
2275 down_read(&dev
->attach_lock
);
2277 if (!dev
->attached
) {
2278 dev_dbg(dev
->class_dev
, "no driver attached\n");
2282 s
= comedi_file_read_subdevice(file
);
2284 if (s
&& s
->async
) {
2285 poll_wait(file
, &s
->async
->wait_head
, wait
);
2286 if (s
->busy
!= file
|| !comedi_is_subdevice_running(s
) ||
2287 (s
->async
->cmd
.flags
& CMDF_WRITE
) ||
2288 comedi_buf_read_n_available(s
) > 0)
2289 mask
|= POLLIN
| POLLRDNORM
;
2292 s
= comedi_file_write_subdevice(file
);
2293 if (s
&& s
->async
) {
2294 unsigned int bps
= comedi_bytes_per_sample(s
);
2297 poll_wait(file
, &s
->async
->wait_head
, wait
);
2298 if (s
->busy
!= file
|| !comedi_is_subdevice_running(s
) ||
2299 !(s
->async
->cmd
.flags
& CMDF_WRITE
) ||
2300 comedi_buf_write_n_available(s
) >= bps
)
2301 mask
|= POLLOUT
| POLLWRNORM
;
2305 up_read(&dev
->attach_lock
);
2309 static ssize_t
comedi_write(struct file
*file
, const char __user
*buf
,
2310 size_t nbytes
, loff_t
*offset
)
2312 struct comedi_subdevice
*s
;
2313 struct comedi_async
*async
;
2317 DECLARE_WAITQUEUE(wait
, current
);
2318 struct comedi_file
*cfp
= file
->private_data
;
2319 struct comedi_device
*dev
= cfp
->dev
;
2320 bool become_nonbusy
= false;
2322 unsigned int old_detach_count
;
2324 /* Protect against device detachment during operation. */
2325 down_read(&dev
->attach_lock
);
2326 attach_locked
= true;
2327 old_detach_count
= dev
->detach_count
;
2329 if (!dev
->attached
) {
2330 dev_dbg(dev
->class_dev
, "no driver attached\n");
2335 s
= comedi_file_write_subdevice(file
);
2336 if (!s
|| !s
->async
) {
2342 if (s
->busy
!= file
|| !(async
->cmd
.flags
& CMDF_WRITE
)) {
2347 add_wait_queue(&async
->wait_head
, &wait
);
2348 while (count
== 0 && !retval
) {
2349 unsigned int runflags
;
2350 unsigned int wp
, n1
, n2
;
2352 set_current_state(TASK_INTERRUPTIBLE
);
2354 runflags
= comedi_get_subdevice_runflags(s
);
2355 if (!comedi_is_runflags_running(runflags
)) {
2356 if (comedi_is_runflags_in_error(runflags
))
2358 if (retval
|| nbytes
)
2359 become_nonbusy
= true;
2365 /* Allocate all free buffer space. */
2366 comedi_buf_write_alloc(s
, async
->prealloc_bufsz
);
2367 m
= comedi_buf_write_n_allocated(s
);
2368 n
= min_t(size_t, m
, nbytes
);
2371 if (file
->f_flags
& O_NONBLOCK
) {
2376 if (signal_pending(current
)) {
2377 retval
= -ERESTARTSYS
;
2380 if (s
->busy
!= file
||
2381 !(async
->cmd
.flags
& CMDF_WRITE
)) {
2388 wp
= async
->buf_write_ptr
;
2389 n1
= min(n
, async
->prealloc_bufsz
- wp
);
2391 m
= copy_from_user(async
->prealloc_buf
+ wp
, buf
, n1
);
2395 m
= copy_from_user(async
->prealloc_buf
, buf
+ n1
, n2
);
2400 comedi_buf_write_free(s
, n
);
2407 remove_wait_queue(&async
->wait_head
, &wait
);
2408 set_current_state(TASK_RUNNING
);
2409 if (become_nonbusy
&& count
== 0) {
2410 struct comedi_subdevice
*new_s
;
2413 * To avoid deadlock, cannot acquire dev->mutex
2414 * while dev->attach_lock is held.
2416 up_read(&dev
->attach_lock
);
2417 attach_locked
= false;
2418 mutex_lock(&dev
->mutex
);
2420 * Check device hasn't become detached behind our back.
2421 * Checking dev->detach_count is unchanged ought to be
2422 * sufficient (unless there have been 2**32 detaches in the
2423 * meantime!), but check the subdevice pointer as well just in
2426 * Also check the subdevice is still in a suitable state to
2427 * become non-busy in case it changed behind our back.
2429 new_s
= comedi_file_write_subdevice(file
);
2430 if (dev
->attached
&& old_detach_count
== dev
->detach_count
&&
2431 s
== new_s
&& new_s
->async
== async
&& s
->busy
== file
&&
2432 (async
->cmd
.flags
& CMDF_WRITE
) &&
2433 !comedi_is_subdevice_running(s
))
2434 do_become_nonbusy(dev
, s
);
2435 mutex_unlock(&dev
->mutex
);
2439 up_read(&dev
->attach_lock
);
2441 return count
? count
: retval
;
2444 static ssize_t
comedi_read(struct file
*file
, char __user
*buf
, size_t nbytes
,
2447 struct comedi_subdevice
*s
;
2448 struct comedi_async
*async
;
2452 DECLARE_WAITQUEUE(wait
, current
);
2453 struct comedi_file
*cfp
= file
->private_data
;
2454 struct comedi_device
*dev
= cfp
->dev
;
2455 unsigned int old_detach_count
;
2456 bool become_nonbusy
= false;
2459 /* Protect against device detachment during operation. */
2460 down_read(&dev
->attach_lock
);
2461 attach_locked
= true;
2462 old_detach_count
= dev
->detach_count
;
2464 if (!dev
->attached
) {
2465 dev_dbg(dev
->class_dev
, "no driver attached\n");
2470 s
= comedi_file_read_subdevice(file
);
2471 if (!s
|| !s
->async
) {
2477 if (s
->busy
!= file
|| (async
->cmd
.flags
& CMDF_WRITE
)) {
2482 add_wait_queue(&async
->wait_head
, &wait
);
2483 while (count
== 0 && !retval
) {
2484 unsigned int rp
, n1
, n2
;
2486 set_current_state(TASK_INTERRUPTIBLE
);
2488 m
= comedi_buf_read_n_available(s
);
2489 n
= min_t(size_t, m
, nbytes
);
2492 unsigned int runflags
=
2493 comedi_get_subdevice_runflags(s
);
2495 if (!comedi_is_runflags_running(runflags
)) {
2496 if (comedi_is_runflags_in_error(runflags
))
2498 if (retval
|| nbytes
)
2499 become_nonbusy
= true;
2504 if (file
->f_flags
& O_NONBLOCK
) {
2509 if (signal_pending(current
)) {
2510 retval
= -ERESTARTSYS
;
2513 if (s
->busy
!= file
||
2514 (async
->cmd
.flags
& CMDF_WRITE
)) {
2520 rp
= async
->buf_read_ptr
;
2521 n1
= min(n
, async
->prealloc_bufsz
- rp
);
2523 m
= copy_to_user(buf
, async
->prealloc_buf
+ rp
, n1
);
2527 m
= copy_to_user(buf
+ n1
, async
->prealloc_buf
, n2
);
2533 comedi_buf_read_alloc(s
, n
);
2534 comedi_buf_read_free(s
, n
);
2541 remove_wait_queue(&async
->wait_head
, &wait
);
2542 set_current_state(TASK_RUNNING
);
2543 if (become_nonbusy
&& count
== 0) {
2544 struct comedi_subdevice
*new_s
;
2547 * To avoid deadlock, cannot acquire dev->mutex
2548 * while dev->attach_lock is held.
2550 up_read(&dev
->attach_lock
);
2551 attach_locked
= false;
2552 mutex_lock(&dev
->mutex
);
2554 * Check device hasn't become detached behind our back.
2555 * Checking dev->detach_count is unchanged ought to be
2556 * sufficient (unless there have been 2**32 detaches in the
2557 * meantime!), but check the subdevice pointer as well just in
2560 * Also check the subdevice is still in a suitable state to
2561 * become non-busy in case it changed behind our back.
2563 new_s
= comedi_file_read_subdevice(file
);
2564 if (dev
->attached
&& old_detach_count
== dev
->detach_count
&&
2565 s
== new_s
&& new_s
->async
== async
&& s
->busy
== file
&&
2566 !(async
->cmd
.flags
& CMDF_WRITE
) &&
2567 !comedi_is_subdevice_running(s
) &&
2568 comedi_buf_read_n_available(s
) == 0)
2569 do_become_nonbusy(dev
, s
);
2570 mutex_unlock(&dev
->mutex
);
2574 up_read(&dev
->attach_lock
);
2576 return count
? count
: retval
;
2579 static int comedi_open(struct inode
*inode
, struct file
*file
)
2581 const unsigned int minor
= iminor(inode
);
2582 struct comedi_file
*cfp
;
2583 struct comedi_device
*dev
= comedi_dev_get_from_minor(minor
);
2587 pr_debug("invalid minor number\n");
2591 cfp
= kzalloc(sizeof(*cfp
), GFP_KERNEL
);
2597 mutex_lock(&dev
->mutex
);
2598 if (!dev
->attached
&& !capable(CAP_SYS_ADMIN
)) {
2599 dev_dbg(dev
->class_dev
, "not attached and not CAP_SYS_ADMIN\n");
2603 if (dev
->attached
&& dev
->use_count
== 0) {
2604 if (!try_module_get(dev
->driver
->module
)) {
2609 rc
= dev
->open(dev
);
2611 module_put(dev
->driver
->module
);
2618 file
->private_data
= cfp
;
2619 comedi_file_reset(file
);
2623 mutex_unlock(&dev
->mutex
);
2625 comedi_dev_put(dev
);
2631 static int comedi_fasync(int fd
, struct file
*file
, int on
)
2633 struct comedi_file
*cfp
= file
->private_data
;
2634 struct comedi_device
*dev
= cfp
->dev
;
2636 return fasync_helper(fd
, file
, on
, &dev
->async_queue
);
2639 static int comedi_close(struct inode
*inode
, struct file
*file
)
2641 struct comedi_file
*cfp
= file
->private_data
;
2642 struct comedi_device
*dev
= cfp
->dev
;
2643 struct comedi_subdevice
*s
= NULL
;
2646 mutex_lock(&dev
->mutex
);
2648 if (dev
->subdevices
) {
2649 for (i
= 0; i
< dev
->n_subdevices
; i
++) {
2650 s
= &dev
->subdevices
[i
];
2652 if (s
->busy
== file
)
2654 if (s
->lock
== file
)
2658 if (dev
->attached
&& dev
->use_count
== 1) {
2661 module_put(dev
->driver
->module
);
2666 mutex_unlock(&dev
->mutex
);
2667 comedi_dev_put(dev
);
2673 static const struct file_operations comedi_fops
= {
2674 .owner
= THIS_MODULE
,
2675 .unlocked_ioctl
= comedi_unlocked_ioctl
,
2676 .compat_ioctl
= comedi_compat_ioctl
,
2677 .open
= comedi_open
,
2678 .release
= comedi_close
,
2679 .read
= comedi_read
,
2680 .write
= comedi_write
,
2681 .mmap
= comedi_mmap
,
2682 .poll
= comedi_poll
,
2683 .fasync
= comedi_fasync
,
2684 .llseek
= noop_llseek
,
2688 * comedi_event() - Handle events for asynchronous COMEDI command
2689 * @dev: COMEDI device.
2690 * @s: COMEDI subdevice.
2691 * Context: in_interrupt() (usually), @s->spin_lock spin-lock not held.
2693 * If an asynchronous COMEDI command is active on the subdevice, process
2694 * any %COMEDI_CB_... event flags that have been set, usually by an
2695 * interrupt handler. These may change the run state of the asynchronous
2696 * command, wake a task, and/or send a %SIGIO signal.
2698 void comedi_event(struct comedi_device
*dev
, struct comedi_subdevice
*s
)
2700 struct comedi_async
*async
= s
->async
;
2701 unsigned int events
;
2703 unsigned long flags
;
2705 spin_lock_irqsave(&s
->spin_lock
, flags
);
2707 events
= async
->events
;
2709 if (!__comedi_is_subdevice_running(s
)) {
2710 spin_unlock_irqrestore(&s
->spin_lock
, flags
);
2714 if (events
& COMEDI_CB_CANCEL_MASK
)
2715 __comedi_clear_subdevice_runflags(s
, COMEDI_SRF_RUNNING
);
2718 * Remember if an error event has occurred, so an error can be
2719 * returned the next time the user does a read() or write().
2721 if (events
& COMEDI_CB_ERROR_MASK
)
2722 __comedi_set_subdevice_runflags(s
, COMEDI_SRF_ERROR
);
2724 if (async
->cb_mask
& events
) {
2725 wake_up_interruptible(&async
->wait_head
);
2726 si_code
= async
->cmd
.flags
& CMDF_WRITE
? POLL_OUT
: POLL_IN
;
2729 spin_unlock_irqrestore(&s
->spin_lock
, flags
);
2732 kill_fasync(&dev
->async_queue
, SIGIO
, si_code
);
2734 EXPORT_SYMBOL_GPL(comedi_event
);
2736 /* Note: the ->mutex is pre-locked on successful return */
2737 struct comedi_device
*comedi_alloc_board_minor(struct device
*hardware_device
)
2739 struct comedi_device
*dev
;
2740 struct device
*csdev
;
2743 dev
= kzalloc(sizeof(*dev
), GFP_KERNEL
);
2745 return ERR_PTR(-ENOMEM
);
2746 comedi_device_init(dev
);
2747 comedi_set_hw_dev(dev
, hardware_device
);
2748 mutex_lock(&dev
->mutex
);
2749 mutex_lock(&comedi_board_minor_table_lock
);
2750 for (i
= hardware_device
? comedi_num_legacy_minors
: 0;
2751 i
< COMEDI_NUM_BOARD_MINORS
; ++i
) {
2752 if (!comedi_board_minor_table
[i
]) {
2753 comedi_board_minor_table
[i
] = dev
;
2757 mutex_unlock(&comedi_board_minor_table_lock
);
2758 if (i
== COMEDI_NUM_BOARD_MINORS
) {
2759 mutex_unlock(&dev
->mutex
);
2760 comedi_device_cleanup(dev
);
2761 comedi_dev_put(dev
);
2762 dev_err(hardware_device
,
2763 "ran out of minor numbers for board device files\n");
2764 return ERR_PTR(-EBUSY
);
2767 csdev
= device_create(comedi_class
, hardware_device
,
2768 MKDEV(COMEDI_MAJOR
, i
), NULL
, "comedi%i", i
);
2770 dev
->class_dev
= get_device(csdev
);
2772 /* Note: dev->mutex needs to be unlocked by the caller. */
2776 void comedi_release_hardware_device(struct device
*hardware_device
)
2779 struct comedi_device
*dev
;
2781 for (minor
= comedi_num_legacy_minors
; minor
< COMEDI_NUM_BOARD_MINORS
;
2783 mutex_lock(&comedi_board_minor_table_lock
);
2784 dev
= comedi_board_minor_table
[minor
];
2785 if (dev
&& dev
->hw_dev
== hardware_device
) {
2786 comedi_board_minor_table
[minor
] = NULL
;
2787 mutex_unlock(&comedi_board_minor_table_lock
);
2788 comedi_free_board_dev(dev
);
2791 mutex_unlock(&comedi_board_minor_table_lock
);
2795 int comedi_alloc_subdevice_minor(struct comedi_subdevice
*s
)
2797 struct comedi_device
*dev
= s
->device
;
2798 struct device
*csdev
;
2801 mutex_lock(&comedi_subdevice_minor_table_lock
);
2802 for (i
= 0; i
< COMEDI_NUM_SUBDEVICE_MINORS
; ++i
) {
2803 if (!comedi_subdevice_minor_table
[i
]) {
2804 comedi_subdevice_minor_table
[i
] = s
;
2808 mutex_unlock(&comedi_subdevice_minor_table_lock
);
2809 if (i
== COMEDI_NUM_SUBDEVICE_MINORS
) {
2810 dev_err(dev
->class_dev
,
2811 "ran out of minor numbers for subdevice files\n");
2814 i
+= COMEDI_NUM_BOARD_MINORS
;
2816 csdev
= device_create(comedi_class
, dev
->class_dev
,
2817 MKDEV(COMEDI_MAJOR
, i
), NULL
, "comedi%i_subd%i",
2818 dev
->minor
, s
->index
);
2820 s
->class_dev
= csdev
;
2825 void comedi_free_subdevice_minor(struct comedi_subdevice
*s
)
2831 if (s
->minor
< COMEDI_NUM_BOARD_MINORS
||
2832 s
->minor
>= COMEDI_NUM_MINORS
)
2835 i
= s
->minor
- COMEDI_NUM_BOARD_MINORS
;
2836 mutex_lock(&comedi_subdevice_minor_table_lock
);
2837 if (s
== comedi_subdevice_minor_table
[i
])
2838 comedi_subdevice_minor_table
[i
] = NULL
;
2839 mutex_unlock(&comedi_subdevice_minor_table_lock
);
2841 device_destroy(comedi_class
, MKDEV(COMEDI_MAJOR
, s
->minor
));
2842 s
->class_dev
= NULL
;
2846 static void comedi_cleanup_board_minors(void)
2848 struct comedi_device
*dev
;
2851 for (i
= 0; i
< COMEDI_NUM_BOARD_MINORS
; i
++) {
2852 dev
= comedi_clear_board_minor(i
);
2853 comedi_free_board_dev(dev
);
2857 static int __init
comedi_init(void)
2862 pr_info("version " COMEDI_RELEASE
" - http://www.comedi.org\n");
2864 if (comedi_num_legacy_minors
< 0 ||
2865 comedi_num_legacy_minors
> COMEDI_NUM_BOARD_MINORS
) {
2866 pr_err("invalid value for module parameter \"comedi_num_legacy_minors\". Valid values are 0 through %i.\n",
2867 COMEDI_NUM_BOARD_MINORS
);
2871 retval
= register_chrdev_region(MKDEV(COMEDI_MAJOR
, 0),
2872 COMEDI_NUM_MINORS
, "comedi");
2875 cdev_init(&comedi_cdev
, &comedi_fops
);
2876 comedi_cdev
.owner
= THIS_MODULE
;
2878 retval
= kobject_set_name(&comedi_cdev
.kobj
, "comedi");
2880 unregister_chrdev_region(MKDEV(COMEDI_MAJOR
, 0),
2885 if (cdev_add(&comedi_cdev
, MKDEV(COMEDI_MAJOR
, 0), COMEDI_NUM_MINORS
)) {
2886 unregister_chrdev_region(MKDEV(COMEDI_MAJOR
, 0),
2890 comedi_class
= class_create(THIS_MODULE
, "comedi");
2891 if (IS_ERR(comedi_class
)) {
2892 pr_err("failed to create class\n");
2893 cdev_del(&comedi_cdev
);
2894 unregister_chrdev_region(MKDEV(COMEDI_MAJOR
, 0),
2896 return PTR_ERR(comedi_class
);
2899 comedi_class
->dev_groups
= comedi_dev_groups
;
2901 /* XXX requires /proc interface */
2904 /* create devices files for legacy/manual use */
2905 for (i
= 0; i
< comedi_num_legacy_minors
; i
++) {
2906 struct comedi_device
*dev
;
2908 dev
= comedi_alloc_board_minor(NULL
);
2910 comedi_cleanup_board_minors();
2911 cdev_del(&comedi_cdev
);
2912 unregister_chrdev_region(MKDEV(COMEDI_MAJOR
, 0),
2914 return PTR_ERR(dev
);
2916 /* comedi_alloc_board_minor() locked the mutex */
2917 mutex_unlock(&dev
->mutex
);
2922 module_init(comedi_init
);
2924 static void __exit
comedi_cleanup(void)
2926 comedi_cleanup_board_minors();
2927 class_destroy(comedi_class
);
2928 cdev_del(&comedi_cdev
);
2929 unregister_chrdev_region(MKDEV(COMEDI_MAJOR
, 0), COMEDI_NUM_MINORS
);
2931 comedi_proc_cleanup();
2933 module_exit(comedi_cleanup
);
2935 MODULE_AUTHOR("http://www.comedi.org");
2936 MODULE_DESCRIPTION("Comedi core module");
2937 MODULE_LICENSE("GPL");