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 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 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 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
*comedi_dev_get_from_subdevice_minor(unsigned minor
)
238 struct comedi_device
*dev
;
239 struct comedi_subdevice
*s
;
240 unsigned int i
= minor
- COMEDI_NUM_BOARD_MINORS
;
242 mutex_lock(&comedi_subdevice_minor_table_lock
);
243 s
= comedi_subdevice_minor_table
[i
];
244 dev
= comedi_dev_get(s
? s
->device
: NULL
);
245 mutex_unlock(&comedi_subdevice_minor_table_lock
);
250 * comedi_dev_get_from_minor() - Get COMEDI device by minor device number
251 * @minor: Minor device number.
253 * Finds the COMEDI device associated with the minor device number, if any,
254 * and increments its reference count. The COMEDI device is prevented from
255 * being freed until a matching call is made to comedi_dev_put().
257 * Return: A pointer to the COMEDI device if it exists, with its usage
258 * reference incremented. Return NULL if no COMEDI device exists with the
259 * specified minor device number.
261 struct comedi_device
*comedi_dev_get_from_minor(unsigned minor
)
263 if (minor
< COMEDI_NUM_BOARD_MINORS
)
264 return comedi_dev_get_from_board_minor(minor
);
266 return comedi_dev_get_from_subdevice_minor(minor
);
268 EXPORT_SYMBOL_GPL(comedi_dev_get_from_minor
);
270 static struct comedi_subdevice
*
271 comedi_read_subdevice(const struct comedi_device
*dev
, unsigned int minor
)
273 struct comedi_subdevice
*s
;
275 if (minor
>= COMEDI_NUM_BOARD_MINORS
) {
276 s
= comedi_subdevice_from_minor(dev
, minor
);
277 if (!s
|| (s
->subdev_flags
& SDF_CMD_READ
))
280 return dev
->read_subdev
;
283 static struct comedi_subdevice
*
284 comedi_write_subdevice(const struct comedi_device
*dev
, unsigned int minor
)
286 struct comedi_subdevice
*s
;
288 if (minor
>= COMEDI_NUM_BOARD_MINORS
) {
289 s
= comedi_subdevice_from_minor(dev
, minor
);
290 if (!s
|| (s
->subdev_flags
& SDF_CMD_WRITE
))
293 return dev
->write_subdev
;
296 static void comedi_file_reset(struct file
*file
)
298 struct comedi_file
*cfp
= file
->private_data
;
299 struct comedi_device
*dev
= cfp
->dev
;
300 struct comedi_subdevice
*s
, *read_s
, *write_s
;
301 unsigned int minor
= iminor(file_inode(file
));
303 read_s
= dev
->read_subdev
;
304 write_s
= dev
->write_subdev
;
305 if (minor
>= COMEDI_NUM_BOARD_MINORS
) {
306 s
= comedi_subdevice_from_minor(dev
, minor
);
307 if (!s
|| s
->subdev_flags
& SDF_CMD_READ
)
309 if (!s
|| s
->subdev_flags
& SDF_CMD_WRITE
)
312 cfp
->last_attached
= dev
->attached
;
313 cfp
->last_detach_count
= dev
->detach_count
;
314 ACCESS_ONCE(cfp
->read_subdev
) = read_s
;
315 ACCESS_ONCE(cfp
->write_subdev
) = write_s
;
318 static void comedi_file_check(struct file
*file
)
320 struct comedi_file
*cfp
= file
->private_data
;
321 struct comedi_device
*dev
= cfp
->dev
;
323 if (cfp
->last_attached
!= dev
->attached
||
324 cfp
->last_detach_count
!= dev
->detach_count
)
325 comedi_file_reset(file
);
328 static struct comedi_subdevice
*comedi_file_read_subdevice(struct file
*file
)
330 struct comedi_file
*cfp
= file
->private_data
;
332 comedi_file_check(file
);
333 return ACCESS_ONCE(cfp
->read_subdev
);
336 static struct comedi_subdevice
*comedi_file_write_subdevice(struct file
*file
)
338 struct comedi_file
*cfp
= file
->private_data
;
340 comedi_file_check(file
);
341 return ACCESS_ONCE(cfp
->write_subdev
);
344 static int resize_async_buffer(struct comedi_device
*dev
,
345 struct comedi_subdevice
*s
, unsigned new_size
)
347 struct comedi_async
*async
= s
->async
;
350 if (new_size
> async
->max_bufsize
)
354 dev_dbg(dev
->class_dev
,
355 "subdevice is busy, cannot resize buffer\n");
358 if (comedi_buf_is_mmapped(s
)) {
359 dev_dbg(dev
->class_dev
,
360 "subdevice is mmapped, cannot resize buffer\n");
364 /* make sure buffer is an integral number of pages (we round up) */
365 new_size
= (new_size
+ PAGE_SIZE
- 1) & PAGE_MASK
;
367 retval
= comedi_buf_alloc(dev
, s
, new_size
);
372 retval
= s
->buf_change(dev
, s
);
377 dev_dbg(dev
->class_dev
, "subd %d buffer resized to %i bytes\n",
378 s
->index
, async
->prealloc_bufsz
);
382 /* sysfs attribute files */
384 static ssize_t
max_read_buffer_kb_show(struct device
*csdev
,
385 struct device_attribute
*attr
, char *buf
)
387 unsigned int minor
= MINOR(csdev
->devt
);
388 struct comedi_device
*dev
;
389 struct comedi_subdevice
*s
;
390 unsigned int size
= 0;
392 dev
= comedi_dev_get_from_minor(minor
);
396 mutex_lock(&dev
->mutex
);
397 s
= comedi_read_subdevice(dev
, minor
);
398 if (s
&& (s
->subdev_flags
& SDF_CMD_READ
) && s
->async
)
399 size
= s
->async
->max_bufsize
/ 1024;
400 mutex_unlock(&dev
->mutex
);
403 return snprintf(buf
, PAGE_SIZE
, "%u\n", size
);
406 static ssize_t
max_read_buffer_kb_store(struct device
*csdev
,
407 struct device_attribute
*attr
,
408 const char *buf
, size_t count
)
410 unsigned int minor
= MINOR(csdev
->devt
);
411 struct comedi_device
*dev
;
412 struct comedi_subdevice
*s
;
416 err
= kstrtouint(buf
, 10, &size
);
419 if (size
> (UINT_MAX
/ 1024))
423 dev
= comedi_dev_get_from_minor(minor
);
427 mutex_lock(&dev
->mutex
);
428 s
= comedi_read_subdevice(dev
, minor
);
429 if (s
&& (s
->subdev_flags
& SDF_CMD_READ
) && s
->async
)
430 s
->async
->max_bufsize
= size
;
433 mutex_unlock(&dev
->mutex
);
436 return err
? err
: count
;
438 static DEVICE_ATTR_RW(max_read_buffer_kb
);
440 static ssize_t
read_buffer_kb_show(struct device
*csdev
,
441 struct device_attribute
*attr
, char *buf
)
443 unsigned int minor
= MINOR(csdev
->devt
);
444 struct comedi_device
*dev
;
445 struct comedi_subdevice
*s
;
446 unsigned int size
= 0;
448 dev
= comedi_dev_get_from_minor(minor
);
452 mutex_lock(&dev
->mutex
);
453 s
= comedi_read_subdevice(dev
, minor
);
454 if (s
&& (s
->subdev_flags
& SDF_CMD_READ
) && s
->async
)
455 size
= s
->async
->prealloc_bufsz
/ 1024;
456 mutex_unlock(&dev
->mutex
);
459 return snprintf(buf
, PAGE_SIZE
, "%u\n", size
);
462 static ssize_t
read_buffer_kb_store(struct device
*csdev
,
463 struct device_attribute
*attr
,
464 const char *buf
, size_t count
)
466 unsigned int minor
= MINOR(csdev
->devt
);
467 struct comedi_device
*dev
;
468 struct comedi_subdevice
*s
;
472 err
= kstrtouint(buf
, 10, &size
);
475 if (size
> (UINT_MAX
/ 1024))
479 dev
= comedi_dev_get_from_minor(minor
);
483 mutex_lock(&dev
->mutex
);
484 s
= comedi_read_subdevice(dev
, minor
);
485 if (s
&& (s
->subdev_flags
& SDF_CMD_READ
) && s
->async
)
486 err
= resize_async_buffer(dev
, s
, size
);
489 mutex_unlock(&dev
->mutex
);
492 return err
? err
: count
;
494 static DEVICE_ATTR_RW(read_buffer_kb
);
496 static ssize_t
max_write_buffer_kb_show(struct device
*csdev
,
497 struct device_attribute
*attr
,
500 unsigned int minor
= MINOR(csdev
->devt
);
501 struct comedi_device
*dev
;
502 struct comedi_subdevice
*s
;
503 unsigned int size
= 0;
505 dev
= comedi_dev_get_from_minor(minor
);
509 mutex_lock(&dev
->mutex
);
510 s
= comedi_write_subdevice(dev
, minor
);
511 if (s
&& (s
->subdev_flags
& SDF_CMD_WRITE
) && s
->async
)
512 size
= s
->async
->max_bufsize
/ 1024;
513 mutex_unlock(&dev
->mutex
);
516 return snprintf(buf
, PAGE_SIZE
, "%u\n", size
);
519 static ssize_t
max_write_buffer_kb_store(struct device
*csdev
,
520 struct device_attribute
*attr
,
521 const char *buf
, size_t count
)
523 unsigned int minor
= MINOR(csdev
->devt
);
524 struct comedi_device
*dev
;
525 struct comedi_subdevice
*s
;
529 err
= kstrtouint(buf
, 10, &size
);
532 if (size
> (UINT_MAX
/ 1024))
536 dev
= comedi_dev_get_from_minor(minor
);
540 mutex_lock(&dev
->mutex
);
541 s
= comedi_write_subdevice(dev
, minor
);
542 if (s
&& (s
->subdev_flags
& SDF_CMD_WRITE
) && s
->async
)
543 s
->async
->max_bufsize
= size
;
546 mutex_unlock(&dev
->mutex
);
549 return err
? err
: count
;
551 static DEVICE_ATTR_RW(max_write_buffer_kb
);
553 static ssize_t
write_buffer_kb_show(struct device
*csdev
,
554 struct device_attribute
*attr
, char *buf
)
556 unsigned int minor
= MINOR(csdev
->devt
);
557 struct comedi_device
*dev
;
558 struct comedi_subdevice
*s
;
559 unsigned int size
= 0;
561 dev
= comedi_dev_get_from_minor(minor
);
565 mutex_lock(&dev
->mutex
);
566 s
= comedi_write_subdevice(dev
, minor
);
567 if (s
&& (s
->subdev_flags
& SDF_CMD_WRITE
) && s
->async
)
568 size
= s
->async
->prealloc_bufsz
/ 1024;
569 mutex_unlock(&dev
->mutex
);
572 return snprintf(buf
, PAGE_SIZE
, "%u\n", size
);
575 static ssize_t
write_buffer_kb_store(struct device
*csdev
,
576 struct device_attribute
*attr
,
577 const char *buf
, size_t count
)
579 unsigned int minor
= MINOR(csdev
->devt
);
580 struct comedi_device
*dev
;
581 struct comedi_subdevice
*s
;
585 err
= kstrtouint(buf
, 10, &size
);
588 if (size
> (UINT_MAX
/ 1024))
592 dev
= comedi_dev_get_from_minor(minor
);
596 mutex_lock(&dev
->mutex
);
597 s
= comedi_write_subdevice(dev
, minor
);
598 if (s
&& (s
->subdev_flags
& SDF_CMD_WRITE
) && s
->async
)
599 err
= resize_async_buffer(dev
, s
, size
);
602 mutex_unlock(&dev
->mutex
);
605 return err
? err
: count
;
607 static DEVICE_ATTR_RW(write_buffer_kb
);
609 static struct attribute
*comedi_dev_attrs
[] = {
610 &dev_attr_max_read_buffer_kb
.attr
,
611 &dev_attr_read_buffer_kb
.attr
,
612 &dev_attr_max_write_buffer_kb
.attr
,
613 &dev_attr_write_buffer_kb
.attr
,
616 ATTRIBUTE_GROUPS(comedi_dev
);
618 static void __comedi_clear_subdevice_runflags(struct comedi_subdevice
*s
,
621 s
->runflags
&= ~bits
;
624 static void __comedi_set_subdevice_runflags(struct comedi_subdevice
*s
,
630 static void comedi_update_subdevice_runflags(struct comedi_subdevice
*s
,
631 unsigned mask
, unsigned bits
)
635 spin_lock_irqsave(&s
->spin_lock
, flags
);
636 __comedi_clear_subdevice_runflags(s
, mask
);
637 __comedi_set_subdevice_runflags(s
, bits
& mask
);
638 spin_unlock_irqrestore(&s
->spin_lock
, flags
);
641 static unsigned __comedi_get_subdevice_runflags(struct comedi_subdevice
*s
)
646 static unsigned comedi_get_subdevice_runflags(struct comedi_subdevice
*s
)
651 spin_lock_irqsave(&s
->spin_lock
, flags
);
652 runflags
= __comedi_get_subdevice_runflags(s
);
653 spin_unlock_irqrestore(&s
->spin_lock
, flags
);
657 static bool comedi_is_runflags_running(unsigned runflags
)
659 return runflags
& COMEDI_SRF_RUNNING
;
662 static bool comedi_is_runflags_in_error(unsigned runflags
)
664 return runflags
& COMEDI_SRF_ERROR
;
668 * comedi_is_subdevice_running() - Check if async command running on subdevice
669 * @s: COMEDI subdevice.
671 * Return: %true if an asynchronous COMEDI command is active on the
672 * subdevice, else %false.
674 bool comedi_is_subdevice_running(struct comedi_subdevice
*s
)
676 unsigned runflags
= comedi_get_subdevice_runflags(s
);
678 return comedi_is_runflags_running(runflags
);
680 EXPORT_SYMBOL_GPL(comedi_is_subdevice_running
);
682 static bool __comedi_is_subdevice_running(struct comedi_subdevice
*s
)
684 unsigned runflags
= __comedi_get_subdevice_runflags(s
);
686 return comedi_is_runflags_running(runflags
);
689 static bool comedi_is_subdevice_idle(struct comedi_subdevice
*s
)
691 unsigned runflags
= comedi_get_subdevice_runflags(s
);
693 return !(runflags
& COMEDI_SRF_BUSY_MASK
);
696 bool comedi_can_auto_free_spriv(struct comedi_subdevice
*s
)
698 unsigned runflags
= __comedi_get_subdevice_runflags(s
);
700 return runflags
& COMEDI_SRF_FREE_SPRIV
;
704 * comedi_set_spriv_auto_free() - Mark subdevice private data as freeable
705 * @s: COMEDI subdevice.
707 * Mark the subdevice as having a pointer to private data that can be
708 * automatically freed when the COMEDI device is detached from the low-level
711 void comedi_set_spriv_auto_free(struct comedi_subdevice
*s
)
713 __comedi_set_subdevice_runflags(s
, COMEDI_SRF_FREE_SPRIV
);
715 EXPORT_SYMBOL_GPL(comedi_set_spriv_auto_free
);
718 * comedi_alloc_spriv - Allocate memory for the subdevice private data
719 * @s: COMEDI subdevice.
720 * @size: Size of the memory to allocate.
722 * Allocate memory for the subdevice private data and point @s->private
723 * to it. The memory will be freed automatically when the COMEDI device
724 * is detached from the low-level driver.
726 * Return: A pointer to the allocated memory @s->private on success.
727 * Return NULL on failure.
729 void *comedi_alloc_spriv(struct comedi_subdevice
*s
, size_t size
)
731 s
->private = kzalloc(size
, GFP_KERNEL
);
733 comedi_set_spriv_auto_free(s
);
736 EXPORT_SYMBOL_GPL(comedi_alloc_spriv
);
739 * This function restores a subdevice to an idle state.
741 static void do_become_nonbusy(struct comedi_device
*dev
,
742 struct comedi_subdevice
*s
)
744 struct comedi_async
*async
= s
->async
;
746 comedi_update_subdevice_runflags(s
, COMEDI_SRF_RUNNING
, 0);
749 async
->inttrig
= NULL
;
750 kfree(async
->cmd
.chanlist
);
751 async
->cmd
.chanlist
= NULL
;
753 wake_up_interruptible_all(&async
->wait_head
);
755 dev_err(dev
->class_dev
,
756 "BUG: (?) do_become_nonbusy called with async=NULL\n");
761 static int do_cancel(struct comedi_device
*dev
, struct comedi_subdevice
*s
)
765 if (comedi_is_subdevice_running(s
) && s
->cancel
)
766 ret
= s
->cancel(dev
, s
);
768 do_become_nonbusy(dev
, s
);
773 void comedi_device_cancel_all(struct comedi_device
*dev
)
775 struct comedi_subdevice
*s
;
781 for (i
= 0; i
< dev
->n_subdevices
; i
++) {
782 s
= &dev
->subdevices
[i
];
788 static int is_device_busy(struct comedi_device
*dev
)
790 struct comedi_subdevice
*s
;
796 for (i
= 0; i
< dev
->n_subdevices
; i
++) {
797 s
= &dev
->subdevices
[i
];
800 if (s
->async
&& comedi_buf_is_mmapped(s
))
808 * COMEDI_DEVCONFIG ioctl
809 * attaches (and configures) or detaches a legacy device
812 * pointer to comedi_devconfig structure (NULL if detaching)
815 * comedi_devconfig structure (if attaching)
820 static int do_devconfig_ioctl(struct comedi_device
*dev
,
821 struct comedi_devconfig __user
*arg
)
823 struct comedi_devconfig it
;
825 if (!capable(CAP_SYS_ADMIN
))
829 if (is_device_busy(dev
))
832 struct module
*driver_module
= dev
->driver
->module
;
834 comedi_device_detach(dev
);
835 module_put(driver_module
);
840 if (copy_from_user(&it
, arg
, sizeof(it
)))
843 it
.board_name
[COMEDI_NAMELEN
- 1] = 0;
845 if (it
.options
[COMEDI_DEVCONF_AUX_DATA_LENGTH
]) {
846 dev_warn(dev
->class_dev
,
847 "comedi_config --init_data is deprecated\n");
851 if (dev
->minor
>= comedi_num_legacy_minors
)
852 /* don't re-use dynamically allocated comedi devices */
855 /* This increments the driver module count on success. */
856 return comedi_device_attach(dev
, &it
);
860 * COMEDI_BUFCONFIG ioctl
861 * buffer configuration
864 * pointer to comedi_bufconfig structure
867 * comedi_bufconfig structure
870 * modified comedi_bufconfig structure
872 static int do_bufconfig_ioctl(struct comedi_device
*dev
,
873 struct comedi_bufconfig __user
*arg
)
875 struct comedi_bufconfig bc
;
876 struct comedi_async
*async
;
877 struct comedi_subdevice
*s
;
880 if (copy_from_user(&bc
, arg
, sizeof(bc
)))
883 if (bc
.subdevice
>= dev
->n_subdevices
)
886 s
= &dev
->subdevices
[bc
.subdevice
];
890 dev_dbg(dev
->class_dev
,
891 "subdevice does not have async capability\n");
897 if (bc
.maximum_size
) {
898 if (!capable(CAP_SYS_ADMIN
))
901 async
->max_bufsize
= bc
.maximum_size
;
905 retval
= resize_async_buffer(dev
, s
, bc
.size
);
910 bc
.size
= async
->prealloc_bufsz
;
911 bc
.maximum_size
= async
->max_bufsize
;
914 if (copy_to_user(arg
, &bc
, sizeof(bc
)))
921 * COMEDI_DEVINFO ioctl
925 * pointer to comedi_devinfo structure
931 * comedi_devinfo structure
933 static int do_devinfo_ioctl(struct comedi_device
*dev
,
934 struct comedi_devinfo __user
*arg
,
937 struct comedi_subdevice
*s
;
938 struct comedi_devinfo devinfo
;
940 memset(&devinfo
, 0, sizeof(devinfo
));
942 /* fill devinfo structure */
943 devinfo
.version_code
= COMEDI_VERSION_CODE
;
944 devinfo
.n_subdevs
= dev
->n_subdevices
;
945 strlcpy(devinfo
.driver_name
, dev
->driver
->driver_name
, COMEDI_NAMELEN
);
946 strlcpy(devinfo
.board_name
, dev
->board_name
, COMEDI_NAMELEN
);
948 s
= comedi_file_read_subdevice(file
);
950 devinfo
.read_subdevice
= s
->index
;
952 devinfo
.read_subdevice
= -1;
954 s
= comedi_file_write_subdevice(file
);
956 devinfo
.write_subdevice
= s
->index
;
958 devinfo
.write_subdevice
= -1;
960 if (copy_to_user(arg
, &devinfo
, sizeof(devinfo
)))
967 * COMEDI_SUBDINFO ioctl
971 * pointer to array of comedi_subdinfo structures
977 * array of comedi_subdinfo structures
979 static int do_subdinfo_ioctl(struct comedi_device
*dev
,
980 struct comedi_subdinfo __user
*arg
, void *file
)
983 struct comedi_subdinfo
*tmp
, *us
;
984 struct comedi_subdevice
*s
;
986 tmp
= kcalloc(dev
->n_subdevices
, sizeof(*tmp
), GFP_KERNEL
);
990 /* fill subdinfo structs */
991 for (i
= 0; i
< dev
->n_subdevices
; i
++) {
992 s
= &dev
->subdevices
[i
];
996 us
->n_chan
= s
->n_chan
;
997 us
->subd_flags
= s
->subdev_flags
;
998 if (comedi_is_subdevice_running(s
))
999 us
->subd_flags
|= SDF_RUNNING
;
1000 #define TIMER_nanosec 5 /* backwards compatibility */
1001 us
->timer_type
= TIMER_nanosec
;
1002 us
->len_chanlist
= s
->len_chanlist
;
1003 us
->maxdata
= s
->maxdata
;
1004 if (s
->range_table
) {
1006 (i
<< 24) | (0 << 16) | (s
->range_table
->length
);
1008 us
->range_type
= 0; /* XXX */
1012 us
->subd_flags
|= SDF_BUSY
;
1013 if (s
->busy
== file
)
1014 us
->subd_flags
|= SDF_BUSY_OWNER
;
1016 us
->subd_flags
|= SDF_LOCKED
;
1017 if (s
->lock
== file
)
1018 us
->subd_flags
|= SDF_LOCK_OWNER
;
1019 if (!s
->maxdata
&& s
->maxdata_list
)
1020 us
->subd_flags
|= SDF_MAXDATA
;
1021 if (s
->range_table_list
)
1022 us
->subd_flags
|= SDF_RANGETYPE
;
1024 us
->subd_flags
|= SDF_CMD
;
1026 if (s
->insn_bits
!= &insn_inval
)
1027 us
->insn_bits_support
= COMEDI_SUPPORTED
;
1029 us
->insn_bits_support
= COMEDI_UNSUPPORTED
;
1032 ret
= copy_to_user(arg
, tmp
, dev
->n_subdevices
* sizeof(*tmp
));
1036 return ret
? -EFAULT
: 0;
1040 * COMEDI_CHANINFO ioctl
1041 * subdevice channel info
1044 * pointer to comedi_chaninfo structure
1047 * comedi_chaninfo structure
1050 * array of maxdata values to chaninfo->maxdata_list if requested
1051 * array of range table lengths to chaninfo->range_table_list if requested
1053 static int do_chaninfo_ioctl(struct comedi_device
*dev
,
1054 struct comedi_chaninfo __user
*arg
)
1056 struct comedi_subdevice
*s
;
1057 struct comedi_chaninfo it
;
1059 if (copy_from_user(&it
, arg
, sizeof(it
)))
1062 if (it
.subdev
>= dev
->n_subdevices
)
1064 s
= &dev
->subdevices
[it
.subdev
];
1066 if (it
.maxdata_list
) {
1067 if (s
->maxdata
|| !s
->maxdata_list
)
1069 if (copy_to_user(it
.maxdata_list
, s
->maxdata_list
,
1070 s
->n_chan
* sizeof(unsigned int)))
1075 return -EINVAL
; /* flaglist not supported */
1080 if (!s
->range_table_list
)
1082 for (i
= 0; i
< s
->n_chan
; i
++) {
1085 x
= (dev
->minor
<< 28) | (it
.subdev
<< 24) | (i
<< 16) |
1086 (s
->range_table_list
[i
]->length
);
1087 if (put_user(x
, it
.rangelist
+ i
))
1096 * COMEDI_BUFINFO ioctl
1097 * buffer information
1100 * pointer to comedi_bufinfo structure
1103 * comedi_bufinfo structure
1106 * modified comedi_bufinfo structure
1108 static int do_bufinfo_ioctl(struct comedi_device
*dev
,
1109 struct comedi_bufinfo __user
*arg
, void *file
)
1111 struct comedi_bufinfo bi
;
1112 struct comedi_subdevice
*s
;
1113 struct comedi_async
*async
;
1115 if (copy_from_user(&bi
, arg
, sizeof(bi
)))
1118 if (bi
.subdevice
>= dev
->n_subdevices
)
1121 s
= &dev
->subdevices
[bi
.subdevice
];
1126 dev_dbg(dev
->class_dev
,
1127 "subdevice does not have async capability\n");
1128 bi
.buf_write_ptr
= 0;
1129 bi
.buf_read_ptr
= 0;
1130 bi
.buf_write_count
= 0;
1131 bi
.buf_read_count
= 0;
1133 bi
.bytes_written
= 0;
1138 bi
.bytes_written
= 0;
1139 goto copyback_position
;
1141 if (s
->busy
!= file
)
1144 if (bi
.bytes_read
&& !(async
->cmd
.flags
& CMDF_WRITE
)) {
1145 bi
.bytes_read
= comedi_buf_read_alloc(s
, bi
.bytes_read
);
1146 comedi_buf_read_free(s
, bi
.bytes_read
);
1148 if (comedi_is_subdevice_idle(s
) &&
1149 comedi_buf_read_n_available(s
) == 0) {
1150 do_become_nonbusy(dev
, s
);
1154 if (bi
.bytes_written
&& (async
->cmd
.flags
& CMDF_WRITE
)) {
1156 comedi_buf_write_alloc(s
, bi
.bytes_written
);
1157 comedi_buf_write_free(s
, bi
.bytes_written
);
1161 bi
.buf_write_count
= async
->buf_write_count
;
1162 bi
.buf_write_ptr
= async
->buf_write_ptr
;
1163 bi
.buf_read_count
= async
->buf_read_count
;
1164 bi
.buf_read_ptr
= async
->buf_read_ptr
;
1167 if (copy_to_user(arg
, &bi
, sizeof(bi
)))
1173 static int check_insn_config_length(struct comedi_insn
*insn
,
1180 case INSN_CONFIG_DIO_OUTPUT
:
1181 case INSN_CONFIG_DIO_INPUT
:
1182 case INSN_CONFIG_DISARM
:
1183 case INSN_CONFIG_RESET
:
1187 case INSN_CONFIG_ARM
:
1188 case INSN_CONFIG_DIO_QUERY
:
1189 case INSN_CONFIG_BLOCK_SIZE
:
1190 case INSN_CONFIG_FILTER
:
1191 case INSN_CONFIG_SERIAL_CLOCK
:
1192 case INSN_CONFIG_BIDIRECTIONAL_DATA
:
1193 case INSN_CONFIG_ALT_SOURCE
:
1194 case INSN_CONFIG_SET_COUNTER_MODE
:
1195 case INSN_CONFIG_8254_READ_STATUS
:
1196 case INSN_CONFIG_SET_ROUTING
:
1197 case INSN_CONFIG_GET_ROUTING
:
1198 case INSN_CONFIG_GET_PWM_STATUS
:
1199 case INSN_CONFIG_PWM_SET_PERIOD
:
1200 case INSN_CONFIG_PWM_GET_PERIOD
:
1204 case INSN_CONFIG_SET_GATE_SRC
:
1205 case INSN_CONFIG_GET_GATE_SRC
:
1206 case INSN_CONFIG_SET_CLOCK_SRC
:
1207 case INSN_CONFIG_GET_CLOCK_SRC
:
1208 case INSN_CONFIG_SET_OTHER_SRC
:
1209 case INSN_CONFIG_GET_COUNTER_STATUS
:
1210 case INSN_CONFIG_PWM_SET_H_BRIDGE
:
1211 case INSN_CONFIG_PWM_GET_H_BRIDGE
:
1212 case INSN_CONFIG_GET_HARDWARE_BUFFER_SIZE
:
1216 case INSN_CONFIG_PWM_OUTPUT
:
1217 case INSN_CONFIG_ANALOG_TRIG
:
1221 case INSN_CONFIG_DIGITAL_TRIG
:
1226 * by default we allow the insn since we don't have checks for
1227 * all possible cases yet
1230 pr_warn("No check for data length of config insn id %i is implemented\n",
1232 pr_warn("Add a check to %s in %s\n", __func__
, __FILE__
);
1233 pr_warn("Assuming n=%i is correct\n", insn
->n
);
1239 static int parse_insn(struct comedi_device
*dev
, struct comedi_insn
*insn
,
1240 unsigned int *data
, void *file
)
1242 struct comedi_subdevice
*s
;
1246 if (insn
->insn
& INSN_MASK_SPECIAL
) {
1247 /* a non-subdevice instruction */
1249 switch (insn
->insn
) {
1259 do_gettimeofday(&tv
);
1260 data
[0] = tv
.tv_sec
;
1261 data
[1] = tv
.tv_usec
;
1267 if (insn
->n
!= 1 || data
[0] >= 100000) {
1271 udelay(data
[0] / 1000);
1279 if (insn
->subdev
>= dev
->n_subdevices
) {
1280 dev_dbg(dev
->class_dev
,
1281 "%d not usable subdevice\n",
1286 s
= &dev
->subdevices
[insn
->subdev
];
1288 dev_dbg(dev
->class_dev
, "no async\n");
1292 if (!s
->async
->inttrig
) {
1293 dev_dbg(dev
->class_dev
, "no inttrig\n");
1297 ret
= s
->async
->inttrig(dev
, s
, data
[0]);
1302 dev_dbg(dev
->class_dev
, "invalid insn\n");
1307 /* a subdevice instruction */
1308 unsigned int maxdata
;
1310 if (insn
->subdev
>= dev
->n_subdevices
) {
1311 dev_dbg(dev
->class_dev
, "subdevice %d out of range\n",
1316 s
= &dev
->subdevices
[insn
->subdev
];
1318 if (s
->type
== COMEDI_SUBD_UNUSED
) {
1319 dev_dbg(dev
->class_dev
, "%d not usable subdevice\n",
1325 /* are we locked? (ioctl lock) */
1326 if (s
->lock
&& s
->lock
!= file
) {
1327 dev_dbg(dev
->class_dev
, "device locked\n");
1332 ret
= comedi_check_chanlist(s
, 1, &insn
->chanspec
);
1335 dev_dbg(dev
->class_dev
, "bad chanspec\n");
1343 /* This looks arbitrary. It is. */
1344 s
->busy
= parse_insn
;
1345 switch (insn
->insn
) {
1347 ret
= s
->insn_read(dev
, s
, insn
, data
);
1348 if (ret
== -ETIMEDOUT
) {
1349 dev_dbg(dev
->class_dev
,
1350 "subdevice %d read instruction timed out\n",
1355 maxdata
= s
->maxdata_list
1356 ? s
->maxdata_list
[CR_CHAN(insn
->chanspec
)]
1358 for (i
= 0; i
< insn
->n
; ++i
) {
1359 if (data
[i
] > maxdata
) {
1361 dev_dbg(dev
->class_dev
,
1362 "bad data value(s)\n");
1367 ret
= s
->insn_write(dev
, s
, insn
, data
);
1368 if (ret
== -ETIMEDOUT
) {
1369 dev_dbg(dev
->class_dev
,
1370 "subdevice %d write instruction timed out\n",
1380 * Most drivers ignore the base channel in
1381 * insn->chanspec. Fix this here if
1382 * the subdevice has <= 32 channels.
1384 unsigned int orig_mask
= data
[0];
1385 unsigned int shift
= 0;
1387 if (s
->n_chan
<= 32) {
1388 shift
= CR_CHAN(insn
->chanspec
);
1395 ret
= s
->insn_bits(dev
, s
, insn
, data
);
1396 data
[0] = orig_mask
;
1402 ret
= check_insn_config_length(insn
, data
);
1405 ret
= s
->insn_config(dev
, s
, insn
, data
);
1420 * COMEDI_INSNLIST ioctl
1421 * synchronous instruction list
1424 * pointer to comedi_insnlist structure
1427 * comedi_insnlist structure
1428 * array of comedi_insn structures from insnlist->insns pointer
1429 * data (for writes) from insns[].data pointers
1432 * data (for reads) to insns[].data pointers
1434 /* arbitrary limits */
1435 #define MAX_SAMPLES 256
1436 static int do_insnlist_ioctl(struct comedi_device
*dev
,
1437 struct comedi_insnlist __user
*arg
, void *file
)
1439 struct comedi_insnlist insnlist
;
1440 struct comedi_insn
*insns
= NULL
;
1441 unsigned int *data
= NULL
;
1445 if (copy_from_user(&insnlist
, arg
, sizeof(insnlist
)))
1448 data
= kmalloc_array(MAX_SAMPLES
, sizeof(unsigned int), GFP_KERNEL
);
1454 insns
= kcalloc(insnlist
.n_insns
, sizeof(*insns
), GFP_KERNEL
);
1460 if (copy_from_user(insns
, insnlist
.insns
,
1461 sizeof(*insns
) * insnlist
.n_insns
)) {
1462 dev_dbg(dev
->class_dev
, "copy_from_user failed\n");
1467 for (i
= 0; i
< insnlist
.n_insns
; i
++) {
1468 if (insns
[i
].n
> MAX_SAMPLES
) {
1469 dev_dbg(dev
->class_dev
,
1470 "number of samples too large\n");
1474 if (insns
[i
].insn
& INSN_MASK_WRITE
) {
1475 if (copy_from_user(data
, insns
[i
].data
,
1476 insns
[i
].n
* sizeof(unsigned int))) {
1477 dev_dbg(dev
->class_dev
,
1478 "copy_from_user failed\n");
1483 ret
= parse_insn(dev
, insns
+ i
, data
, file
);
1486 if (insns
[i
].insn
& INSN_MASK_READ
) {
1487 if (copy_to_user(insns
[i
].data
, data
,
1488 insns
[i
].n
* sizeof(unsigned int))) {
1489 dev_dbg(dev
->class_dev
,
1490 "copy_to_user failed\n");
1510 * synchronous instruction
1513 * pointer to comedi_insn structure
1516 * comedi_insn structure
1517 * data (for writes) from insn->data pointer
1520 * data (for reads) to insn->data pointer
1522 static int do_insn_ioctl(struct comedi_device
*dev
,
1523 struct comedi_insn __user
*arg
, void *file
)
1525 struct comedi_insn insn
;
1526 unsigned int *data
= NULL
;
1529 data
= kmalloc_array(MAX_SAMPLES
, sizeof(unsigned int), GFP_KERNEL
);
1535 if (copy_from_user(&insn
, arg
, sizeof(insn
))) {
1540 /* This is where the behavior of insn and insnlist deviate. */
1541 if (insn
.n
> MAX_SAMPLES
)
1542 insn
.n
= MAX_SAMPLES
;
1543 if (insn
.insn
& INSN_MASK_WRITE
) {
1544 if (copy_from_user(data
,
1546 insn
.n
* sizeof(unsigned int))) {
1551 ret
= parse_insn(dev
, &insn
, data
, file
);
1554 if (insn
.insn
& INSN_MASK_READ
) {
1555 if (copy_to_user(insn
.data
,
1557 insn
.n
* sizeof(unsigned int))) {
1570 static int __comedi_get_user_cmd(struct comedi_device
*dev
,
1571 struct comedi_cmd __user
*arg
,
1572 struct comedi_cmd
*cmd
)
1574 struct comedi_subdevice
*s
;
1576 if (copy_from_user(cmd
, arg
, sizeof(*cmd
))) {
1577 dev_dbg(dev
->class_dev
, "bad cmd address\n");
1581 if (cmd
->subdev
>= dev
->n_subdevices
) {
1582 dev_dbg(dev
->class_dev
, "%d no such subdevice\n", cmd
->subdev
);
1586 s
= &dev
->subdevices
[cmd
->subdev
];
1588 if (s
->type
== COMEDI_SUBD_UNUSED
) {
1589 dev_dbg(dev
->class_dev
, "%d not valid subdevice\n",
1594 if (!s
->do_cmd
|| !s
->do_cmdtest
|| !s
->async
) {
1595 dev_dbg(dev
->class_dev
,
1596 "subdevice %d does not support commands\n",
1601 /* make sure channel/gain list isn't too long */
1602 if (cmd
->chanlist_len
> s
->len_chanlist
) {
1603 dev_dbg(dev
->class_dev
, "channel/gain list too long %d > %d\n",
1604 cmd
->chanlist_len
, s
->len_chanlist
);
1609 * Set the CMDF_WRITE flag to the correct state if the subdevice
1610 * supports only "read" commands or only "write" commands.
1612 switch (s
->subdev_flags
& (SDF_CMD_READ
| SDF_CMD_WRITE
)) {
1614 cmd
->flags
&= ~CMDF_WRITE
;
1617 cmd
->flags
|= CMDF_WRITE
;
1626 static int __comedi_get_user_chanlist(struct comedi_device
*dev
,
1627 struct comedi_subdevice
*s
,
1628 unsigned int __user
*user_chanlist
,
1629 struct comedi_cmd
*cmd
)
1631 unsigned int *chanlist
;
1634 cmd
->chanlist
= NULL
;
1635 chanlist
= memdup_user(user_chanlist
,
1636 cmd
->chanlist_len
* sizeof(unsigned int));
1637 if (IS_ERR(chanlist
))
1638 return PTR_ERR(chanlist
);
1640 /* make sure each element in channel/gain list is valid */
1641 ret
= comedi_check_chanlist(s
, cmd
->chanlist_len
, chanlist
);
1647 cmd
->chanlist
= chanlist
;
1654 * asynchronous acquisition command set-up
1657 * pointer to comedi_cmd structure
1660 * comedi_cmd structure
1661 * channel/range list from cmd->chanlist pointer
1664 * possibly modified comedi_cmd structure (when -EAGAIN returned)
1666 static int do_cmd_ioctl(struct comedi_device
*dev
,
1667 struct comedi_cmd __user
*arg
, void *file
)
1669 struct comedi_cmd cmd
;
1670 struct comedi_subdevice
*s
;
1671 struct comedi_async
*async
;
1672 unsigned int __user
*user_chanlist
;
1675 /* get the user's cmd and do some simple validation */
1676 ret
= __comedi_get_user_cmd(dev
, arg
, &cmd
);
1680 /* save user's chanlist pointer so it can be restored later */
1681 user_chanlist
= (unsigned int __user
*)cmd
.chanlist
;
1683 s
= &dev
->subdevices
[cmd
.subdev
];
1686 /* are we locked? (ioctl lock) */
1687 if (s
->lock
&& s
->lock
!= file
) {
1688 dev_dbg(dev
->class_dev
, "subdevice locked\n");
1694 dev_dbg(dev
->class_dev
, "subdevice busy\n");
1698 /* make sure channel/gain list isn't too short */
1699 if (cmd
.chanlist_len
< 1) {
1700 dev_dbg(dev
->class_dev
, "channel/gain list too short %u < 1\n",
1706 async
->cmd
.data
= NULL
;
1708 /* load channel/gain list */
1709 ret
= __comedi_get_user_chanlist(dev
, s
, user_chanlist
, &async
->cmd
);
1713 ret
= s
->do_cmdtest(dev
, s
, &async
->cmd
);
1715 if (async
->cmd
.flags
& CMDF_BOGUS
|| ret
) {
1716 dev_dbg(dev
->class_dev
, "test returned %d\n", ret
);
1718 /* restore chanlist pointer before copying back */
1719 cmd
.chanlist
= (unsigned int __force
*)user_chanlist
;
1721 if (copy_to_user(arg
, &cmd
, sizeof(cmd
))) {
1722 dev_dbg(dev
->class_dev
, "fault writing cmd\n");
1730 if (!async
->prealloc_bufsz
) {
1732 dev_dbg(dev
->class_dev
, "no buffer (?)\n");
1736 comedi_buf_reset(s
);
1738 async
->cb_mask
= COMEDI_CB_BLOCK
| COMEDI_CB_CANCEL_MASK
;
1739 if (async
->cmd
.flags
& CMDF_WAKE_EOS
)
1740 async
->cb_mask
|= COMEDI_CB_EOS
;
1742 comedi_update_subdevice_runflags(s
, COMEDI_SRF_BUSY_MASK
,
1743 COMEDI_SRF_RUNNING
);
1746 * Set s->busy _after_ setting COMEDI_SRF_RUNNING flag to avoid
1747 * race with comedi_read() or comedi_write().
1750 ret
= s
->do_cmd(dev
, s
);
1755 do_become_nonbusy(dev
, s
);
1761 * COMEDI_CMDTEST ioctl
1762 * asynchronous acquisition command testing
1765 * pointer to comedi_cmd structure
1768 * comedi_cmd structure
1769 * channel/range list from cmd->chanlist pointer
1772 * possibly modified comedi_cmd structure
1774 static int do_cmdtest_ioctl(struct comedi_device
*dev
,
1775 struct comedi_cmd __user
*arg
, void *file
)
1777 struct comedi_cmd cmd
;
1778 struct comedi_subdevice
*s
;
1779 unsigned int __user
*user_chanlist
;
1782 /* get the user's cmd and do some simple validation */
1783 ret
= __comedi_get_user_cmd(dev
, arg
, &cmd
);
1787 /* save user's chanlist pointer so it can be restored later */
1788 user_chanlist
= (unsigned int __user
*)cmd
.chanlist
;
1790 s
= &dev
->subdevices
[cmd
.subdev
];
1792 /* user_chanlist can be NULL for COMEDI_CMDTEST ioctl */
1793 if (user_chanlist
) {
1794 /* load channel/gain list */
1795 ret
= __comedi_get_user_chanlist(dev
, s
, user_chanlist
, &cmd
);
1800 ret
= s
->do_cmdtest(dev
, s
, &cmd
);
1802 kfree(cmd
.chanlist
); /* free kernel copy of user chanlist */
1804 /* restore chanlist pointer before copying back */
1805 cmd
.chanlist
= (unsigned int __force
*)user_chanlist
;
1807 if (copy_to_user(arg
, &cmd
, sizeof(cmd
))) {
1808 dev_dbg(dev
->class_dev
, "bad cmd address\n");
1828 static int do_lock_ioctl(struct comedi_device
*dev
, unsigned long arg
,
1832 unsigned long flags
;
1833 struct comedi_subdevice
*s
;
1835 if (arg
>= dev
->n_subdevices
)
1837 s
= &dev
->subdevices
[arg
];
1839 spin_lock_irqsave(&s
->spin_lock
, flags
);
1840 if (s
->busy
|| s
->lock
)
1844 spin_unlock_irqrestore(&s
->spin_lock
, flags
);
1850 * COMEDI_UNLOCK ioctl
1862 static int do_unlock_ioctl(struct comedi_device
*dev
, unsigned long arg
,
1865 struct comedi_subdevice
*s
;
1867 if (arg
>= dev
->n_subdevices
)
1869 s
= &dev
->subdevices
[arg
];
1874 if (s
->lock
&& s
->lock
!= file
)
1877 if (s
->lock
== file
)
1884 * COMEDI_CANCEL ioctl
1885 * cancel asynchronous acquisition
1896 static int do_cancel_ioctl(struct comedi_device
*dev
, unsigned long arg
,
1899 struct comedi_subdevice
*s
;
1901 if (arg
>= dev
->n_subdevices
)
1903 s
= &dev
->subdevices
[arg
];
1910 if (s
->busy
!= file
)
1913 return do_cancel(dev
, s
);
1918 * instructs driver to synchronize buffers
1929 static int do_poll_ioctl(struct comedi_device
*dev
, unsigned long arg
,
1932 struct comedi_subdevice
*s
;
1934 if (arg
>= dev
->n_subdevices
)
1936 s
= &dev
->subdevices
[arg
];
1941 if (s
->busy
!= file
)
1945 return s
->poll(dev
, s
);
1951 * COMEDI_SETRSUBD ioctl
1952 * sets the current "read" subdevice on a per-file basis
1963 static int do_setrsubd_ioctl(struct comedi_device
*dev
, unsigned long arg
,
1966 struct comedi_file
*cfp
= file
->private_data
;
1967 struct comedi_subdevice
*s_old
, *s_new
;
1969 if (arg
>= dev
->n_subdevices
)
1972 s_new
= &dev
->subdevices
[arg
];
1973 s_old
= comedi_file_read_subdevice(file
);
1975 return 0; /* no change */
1977 if (!(s_new
->subdev_flags
& SDF_CMD_READ
))
1981 * Check the file isn't still busy handling a "read" command on the
1982 * old subdevice (if any).
1984 if (s_old
&& s_old
->busy
== file
&& s_old
->async
&&
1985 !(s_old
->async
->cmd
.flags
& CMDF_WRITE
))
1988 ACCESS_ONCE(cfp
->read_subdev
) = s_new
;
1993 * COMEDI_SETWSUBD ioctl
1994 * sets the current "write" subdevice on a per-file basis
2005 static int do_setwsubd_ioctl(struct comedi_device
*dev
, unsigned long arg
,
2008 struct comedi_file
*cfp
= file
->private_data
;
2009 struct comedi_subdevice
*s_old
, *s_new
;
2011 if (arg
>= dev
->n_subdevices
)
2014 s_new
= &dev
->subdevices
[arg
];
2015 s_old
= comedi_file_write_subdevice(file
);
2017 return 0; /* no change */
2019 if (!(s_new
->subdev_flags
& SDF_CMD_WRITE
))
2023 * Check the file isn't still busy handling a "write" command on the
2024 * old subdevice (if any).
2026 if (s_old
&& s_old
->busy
== file
&& s_old
->async
&&
2027 (s_old
->async
->cmd
.flags
& CMDF_WRITE
))
2030 ACCESS_ONCE(cfp
->write_subdev
) = s_new
;
2034 static long comedi_unlocked_ioctl(struct file
*file
, unsigned int cmd
,
2037 unsigned minor
= iminor(file_inode(file
));
2038 struct comedi_file
*cfp
= file
->private_data
;
2039 struct comedi_device
*dev
= cfp
->dev
;
2042 mutex_lock(&dev
->mutex
);
2045 * Device config is special, because it must work on
2046 * an unconfigured device.
2048 if (cmd
== COMEDI_DEVCONFIG
) {
2049 if (minor
>= COMEDI_NUM_BOARD_MINORS
) {
2050 /* Device config not appropriate on non-board minors. */
2054 rc
= do_devconfig_ioctl(dev
,
2055 (struct comedi_devconfig __user
*)arg
);
2058 dev
->minor
>= comedi_num_legacy_minors
) {
2060 * Successfully unconfigured a dynamically
2061 * allocated device. Try and remove it.
2063 if (comedi_clear_board_dev(dev
)) {
2064 mutex_unlock(&dev
->mutex
);
2065 comedi_free_board_dev(dev
);
2073 if (!dev
->attached
) {
2074 dev_dbg(dev
->class_dev
, "no driver attached\n");
2080 case COMEDI_BUFCONFIG
:
2081 rc
= do_bufconfig_ioctl(dev
,
2082 (struct comedi_bufconfig __user
*)arg
);
2084 case COMEDI_DEVINFO
:
2085 rc
= do_devinfo_ioctl(dev
, (struct comedi_devinfo __user
*)arg
,
2088 case COMEDI_SUBDINFO
:
2089 rc
= do_subdinfo_ioctl(dev
,
2090 (struct comedi_subdinfo __user
*)arg
,
2093 case COMEDI_CHANINFO
:
2094 rc
= do_chaninfo_ioctl(dev
, (void __user
*)arg
);
2096 case COMEDI_RANGEINFO
:
2097 rc
= do_rangeinfo_ioctl(dev
, (void __user
*)arg
);
2099 case COMEDI_BUFINFO
:
2100 rc
= do_bufinfo_ioctl(dev
,
2101 (struct comedi_bufinfo __user
*)arg
,
2105 rc
= do_lock_ioctl(dev
, arg
, file
);
2108 rc
= do_unlock_ioctl(dev
, arg
, file
);
2111 rc
= do_cancel_ioctl(dev
, arg
, file
);
2114 rc
= do_cmd_ioctl(dev
, (struct comedi_cmd __user
*)arg
, file
);
2116 case COMEDI_CMDTEST
:
2117 rc
= do_cmdtest_ioctl(dev
, (struct comedi_cmd __user
*)arg
,
2120 case COMEDI_INSNLIST
:
2121 rc
= do_insnlist_ioctl(dev
,
2122 (struct comedi_insnlist __user
*)arg
,
2126 rc
= do_insn_ioctl(dev
, (struct comedi_insn __user
*)arg
,
2130 rc
= do_poll_ioctl(dev
, arg
, file
);
2132 case COMEDI_SETRSUBD
:
2133 rc
= do_setrsubd_ioctl(dev
, arg
, file
);
2135 case COMEDI_SETWSUBD
:
2136 rc
= do_setwsubd_ioctl(dev
, arg
, file
);
2144 mutex_unlock(&dev
->mutex
);
2148 static void comedi_vm_open(struct vm_area_struct
*area
)
2150 struct comedi_buf_map
*bm
;
2152 bm
= area
->vm_private_data
;
2153 comedi_buf_map_get(bm
);
2156 static void comedi_vm_close(struct vm_area_struct
*area
)
2158 struct comedi_buf_map
*bm
;
2160 bm
= area
->vm_private_data
;
2161 comedi_buf_map_put(bm
);
2164 static const struct vm_operations_struct comedi_vm_ops
= {
2165 .open
= comedi_vm_open
,
2166 .close
= comedi_vm_close
,
2169 static int comedi_mmap(struct file
*file
, struct vm_area_struct
*vma
)
2171 struct comedi_file
*cfp
= file
->private_data
;
2172 struct comedi_device
*dev
= cfp
->dev
;
2173 struct comedi_subdevice
*s
;
2174 struct comedi_async
*async
;
2175 struct comedi_buf_map
*bm
= NULL
;
2176 unsigned long start
= vma
->vm_start
;
2183 * 'trylock' avoids circular dependency with current->mm->mmap_sem
2184 * and down-reading &dev->attach_lock should normally succeed without
2185 * contention unless the device is in the process of being attached
2188 if (!down_read_trylock(&dev
->attach_lock
))
2191 if (!dev
->attached
) {
2192 dev_dbg(dev
->class_dev
, "no driver attached\n");
2197 if (vma
->vm_flags
& VM_WRITE
)
2198 s
= comedi_file_write_subdevice(file
);
2200 s
= comedi_file_read_subdevice(file
);
2212 if (vma
->vm_pgoff
!= 0) {
2213 dev_dbg(dev
->class_dev
, "mmap() offset must be 0.\n");
2218 size
= vma
->vm_end
- vma
->vm_start
;
2219 if (size
> async
->prealloc_bufsz
) {
2223 if (size
& (~PAGE_MASK
)) {
2228 n_pages
= size
>> PAGE_SHIFT
;
2230 /* get reference to current buf map (if any) */
2231 bm
= comedi_buf_map_from_subdev_get(s
);
2232 if (!bm
|| n_pages
> bm
->n_pages
) {
2236 for (i
= 0; i
< n_pages
; ++i
) {
2237 struct comedi_buf_page
*buf
= &bm
->page_list
[i
];
2239 if (remap_pfn_range(vma
, start
,
2240 page_to_pfn(virt_to_page(buf
->virt_addr
)),
2241 PAGE_SIZE
, PAGE_SHARED
)) {
2248 vma
->vm_ops
= &comedi_vm_ops
;
2249 vma
->vm_private_data
= bm
;
2251 vma
->vm_ops
->open(vma
);
2255 up_read(&dev
->attach_lock
);
2256 comedi_buf_map_put(bm
); /* put reference to buf map - okay if NULL */
2260 static unsigned int comedi_poll(struct file
*file
, poll_table
*wait
)
2262 unsigned int mask
= 0;
2263 struct comedi_file
*cfp
= file
->private_data
;
2264 struct comedi_device
*dev
= cfp
->dev
;
2265 struct comedi_subdevice
*s
, *s_read
;
2267 down_read(&dev
->attach_lock
);
2269 if (!dev
->attached
) {
2270 dev_dbg(dev
->class_dev
, "no driver attached\n");
2274 s
= comedi_file_read_subdevice(file
);
2276 if (s
&& s
->async
) {
2277 poll_wait(file
, &s
->async
->wait_head
, wait
);
2278 if (s
->busy
!= file
|| !comedi_is_subdevice_running(s
) ||
2279 (s
->async
->cmd
.flags
& CMDF_WRITE
) ||
2280 comedi_buf_read_n_available(s
) > 0)
2281 mask
|= POLLIN
| POLLRDNORM
;
2284 s
= comedi_file_write_subdevice(file
);
2285 if (s
&& s
->async
) {
2286 unsigned int bps
= comedi_bytes_per_sample(s
);
2289 poll_wait(file
, &s
->async
->wait_head
, wait
);
2290 if (s
->busy
!= file
|| !comedi_is_subdevice_running(s
) ||
2291 !(s
->async
->cmd
.flags
& CMDF_WRITE
) ||
2292 comedi_buf_write_n_available(s
) >= bps
)
2293 mask
|= POLLOUT
| POLLWRNORM
;
2297 up_read(&dev
->attach_lock
);
2301 static ssize_t
comedi_write(struct file
*file
, const char __user
*buf
,
2302 size_t nbytes
, loff_t
*offset
)
2304 struct comedi_subdevice
*s
;
2305 struct comedi_async
*async
;
2309 DECLARE_WAITQUEUE(wait
, current
);
2310 struct comedi_file
*cfp
= file
->private_data
;
2311 struct comedi_device
*dev
= cfp
->dev
;
2312 bool become_nonbusy
= false;
2314 unsigned int old_detach_count
;
2316 /* Protect against device detachment during operation. */
2317 down_read(&dev
->attach_lock
);
2318 attach_locked
= true;
2319 old_detach_count
= dev
->detach_count
;
2321 if (!dev
->attached
) {
2322 dev_dbg(dev
->class_dev
, "no driver attached\n");
2327 s
= comedi_file_write_subdevice(file
);
2328 if (!s
|| !s
->async
) {
2340 if (s
->busy
!= file
) {
2344 if (!(async
->cmd
.flags
& CMDF_WRITE
)) {
2349 add_wait_queue(&async
->wait_head
, &wait
);
2350 while (count
== 0 && !retval
) {
2352 unsigned int wp
, n1
, n2
;
2354 set_current_state(TASK_INTERRUPTIBLE
);
2356 runflags
= comedi_get_subdevice_runflags(s
);
2357 if (!comedi_is_runflags_running(runflags
)) {
2358 if (comedi_is_runflags_in_error(runflags
))
2360 become_nonbusy
= true;
2364 /* Allocate all free buffer space. */
2365 comedi_buf_write_alloc(s
, async
->prealloc_bufsz
);
2366 m
= comedi_buf_write_n_allocated(s
);
2367 n
= min_t(size_t, m
, nbytes
);
2370 if (file
->f_flags
& O_NONBLOCK
) {
2375 if (signal_pending(current
)) {
2376 retval
= -ERESTARTSYS
;
2383 if (s
->busy
!= file
) {
2387 if (!(async
->cmd
.flags
& CMDF_WRITE
)) {
2394 wp
= async
->buf_write_ptr
;
2395 n1
= min(n
, async
->prealloc_bufsz
- wp
);
2397 m
= copy_from_user(async
->prealloc_buf
+ wp
, buf
, n1
);
2401 m
= copy_from_user(async
->prealloc_buf
, buf
+ n1
, n2
);
2406 comedi_buf_write_free(s
, n
);
2413 remove_wait_queue(&async
->wait_head
, &wait
);
2414 set_current_state(TASK_RUNNING
);
2415 if (become_nonbusy
&& count
== 0) {
2416 struct comedi_subdevice
*new_s
;
2419 * To avoid deadlock, cannot acquire dev->mutex
2420 * while dev->attach_lock is held.
2422 up_read(&dev
->attach_lock
);
2423 attach_locked
= false;
2424 mutex_lock(&dev
->mutex
);
2426 * Check device hasn't become detached behind our back.
2427 * Checking dev->detach_count is unchanged ought to be
2428 * sufficient (unless there have been 2**32 detaches in the
2429 * meantime!), but check the subdevice pointer as well just in
2432 * Also check the subdevice is still in a suitable state to
2433 * become non-busy in case it changed behind our back.
2435 new_s
= comedi_file_write_subdevice(file
);
2436 if (dev
->attached
&& old_detach_count
== dev
->detach_count
&&
2437 s
== new_s
&& new_s
->async
== async
&& s
->busy
== file
&&
2438 (async
->cmd
.flags
& CMDF_WRITE
) &&
2439 !comedi_is_subdevice_running(s
))
2440 do_become_nonbusy(dev
, s
);
2441 mutex_unlock(&dev
->mutex
);
2445 up_read(&dev
->attach_lock
);
2447 return count
? count
: retval
;
2450 static ssize_t
comedi_read(struct file
*file
, char __user
*buf
, size_t nbytes
,
2453 struct comedi_subdevice
*s
;
2454 struct comedi_async
*async
;
2458 DECLARE_WAITQUEUE(wait
, current
);
2459 struct comedi_file
*cfp
= file
->private_data
;
2460 struct comedi_device
*dev
= cfp
->dev
;
2461 unsigned int old_detach_count
;
2462 bool become_nonbusy
= false;
2465 /* Protect against device detachment during operation. */
2466 down_read(&dev
->attach_lock
);
2467 attach_locked
= true;
2468 old_detach_count
= dev
->detach_count
;
2470 if (!dev
->attached
) {
2471 dev_dbg(dev
->class_dev
, "no driver attached\n");
2476 s
= comedi_file_read_subdevice(file
);
2477 if (!s
|| !s
->async
) {
2483 if (s
->busy
!= file
|| (async
->cmd
.flags
& CMDF_WRITE
)) {
2488 add_wait_queue(&async
->wait_head
, &wait
);
2489 while (count
== 0 && !retval
) {
2490 unsigned int rp
, n1
, n2
;
2492 set_current_state(TASK_INTERRUPTIBLE
);
2494 m
= comedi_buf_read_n_available(s
);
2495 n
= min_t(size_t, m
, nbytes
);
2498 unsigned runflags
= comedi_get_subdevice_runflags(s
);
2500 if (!comedi_is_runflags_running(runflags
)) {
2501 if (comedi_is_runflags_in_error(runflags
))
2503 if (retval
|| nbytes
)
2504 become_nonbusy
= true;
2509 if (file
->f_flags
& O_NONBLOCK
) {
2514 if (signal_pending(current
)) {
2515 retval
= -ERESTARTSYS
;
2518 if (s
->busy
!= file
||
2519 (async
->cmd
.flags
& CMDF_WRITE
)) {
2525 rp
= async
->buf_read_ptr
;
2526 n1
= min(n
, async
->prealloc_bufsz
- rp
);
2528 m
= copy_to_user(buf
, async
->prealloc_buf
+ rp
, n1
);
2532 m
= copy_to_user(buf
+ n1
, async
->prealloc_buf
, n2
);
2538 comedi_buf_read_alloc(s
, n
);
2539 comedi_buf_read_free(s
, n
);
2546 remove_wait_queue(&async
->wait_head
, &wait
);
2547 set_current_state(TASK_RUNNING
);
2548 if (become_nonbusy
&& count
== 0) {
2549 struct comedi_subdevice
*new_s
;
2552 * To avoid deadlock, cannot acquire dev->mutex
2553 * while dev->attach_lock is held.
2555 up_read(&dev
->attach_lock
);
2556 attach_locked
= false;
2557 mutex_lock(&dev
->mutex
);
2559 * Check device hasn't become detached behind our back.
2560 * Checking dev->detach_count is unchanged ought to be
2561 * sufficient (unless there have been 2**32 detaches in the
2562 * meantime!), but check the subdevice pointer as well just in
2565 * Also check the subdevice is still in a suitable state to
2566 * become non-busy in case it changed behind our back.
2568 new_s
= comedi_file_read_subdevice(file
);
2569 if (dev
->attached
&& old_detach_count
== dev
->detach_count
&&
2570 s
== new_s
&& new_s
->async
== async
&& s
->busy
== file
&&
2571 !(async
->cmd
.flags
& CMDF_WRITE
) &&
2572 !comedi_is_subdevice_running(s
) &&
2573 comedi_buf_read_n_available(s
) == 0)
2574 do_become_nonbusy(dev
, s
);
2575 mutex_unlock(&dev
->mutex
);
2579 up_read(&dev
->attach_lock
);
2581 return count
? count
: retval
;
2584 static int comedi_open(struct inode
*inode
, struct file
*file
)
2586 const unsigned minor
= iminor(inode
);
2587 struct comedi_file
*cfp
;
2588 struct comedi_device
*dev
= comedi_dev_get_from_minor(minor
);
2592 pr_debug("invalid minor number\n");
2596 cfp
= kzalloc(sizeof(*cfp
), GFP_KERNEL
);
2602 mutex_lock(&dev
->mutex
);
2603 if (!dev
->attached
&& !capable(CAP_SYS_ADMIN
)) {
2604 dev_dbg(dev
->class_dev
, "not attached and not CAP_SYS_ADMIN\n");
2608 if (dev
->attached
&& dev
->use_count
== 0) {
2609 if (!try_module_get(dev
->driver
->module
)) {
2614 rc
= dev
->open(dev
);
2616 module_put(dev
->driver
->module
);
2623 file
->private_data
= cfp
;
2624 comedi_file_reset(file
);
2628 mutex_unlock(&dev
->mutex
);
2630 comedi_dev_put(dev
);
2636 static int comedi_fasync(int fd
, struct file
*file
, int on
)
2638 struct comedi_file
*cfp
= file
->private_data
;
2639 struct comedi_device
*dev
= cfp
->dev
;
2641 return fasync_helper(fd
, file
, on
, &dev
->async_queue
);
2644 static int comedi_close(struct inode
*inode
, struct file
*file
)
2646 struct comedi_file
*cfp
= file
->private_data
;
2647 struct comedi_device
*dev
= cfp
->dev
;
2648 struct comedi_subdevice
*s
= NULL
;
2651 mutex_lock(&dev
->mutex
);
2653 if (dev
->subdevices
) {
2654 for (i
= 0; i
< dev
->n_subdevices
; i
++) {
2655 s
= &dev
->subdevices
[i
];
2657 if (s
->busy
== file
)
2659 if (s
->lock
== file
)
2663 if (dev
->attached
&& dev
->use_count
== 1) {
2666 module_put(dev
->driver
->module
);
2671 mutex_unlock(&dev
->mutex
);
2672 comedi_dev_put(dev
);
2678 static const struct file_operations comedi_fops
= {
2679 .owner
= THIS_MODULE
,
2680 .unlocked_ioctl
= comedi_unlocked_ioctl
,
2681 .compat_ioctl
= comedi_compat_ioctl
,
2682 .open
= comedi_open
,
2683 .release
= comedi_close
,
2684 .read
= comedi_read
,
2685 .write
= comedi_write
,
2686 .mmap
= comedi_mmap
,
2687 .poll
= comedi_poll
,
2688 .fasync
= comedi_fasync
,
2689 .llseek
= noop_llseek
,
2693 * comedi_event() - Handle events for asynchronous COMEDI command
2694 * @dev: COMEDI device.
2695 * @s: COMEDI subdevice.
2696 * Context: in_interrupt() (usually), @s->spin_lock spin-lock not held.
2698 * If an asynchronous COMEDI command is active on the subdevice, process
2699 * any %COMEDI_CB_... event flags that have been set, usually by an
2700 * interrupt handler. These may change the run state of the asynchronous
2701 * command, wake a task, and/or send a %SIGIO signal.
2703 void comedi_event(struct comedi_device
*dev
, struct comedi_subdevice
*s
)
2705 struct comedi_async
*async
= s
->async
;
2706 unsigned int events
;
2708 unsigned long flags
;
2710 spin_lock_irqsave(&s
->spin_lock
, flags
);
2712 events
= async
->events
;
2714 if (!__comedi_is_subdevice_running(s
)) {
2715 spin_unlock_irqrestore(&s
->spin_lock
, flags
);
2719 if (events
& COMEDI_CB_CANCEL_MASK
)
2720 __comedi_clear_subdevice_runflags(s
, COMEDI_SRF_RUNNING
);
2723 * Remember if an error event has occurred, so an error can be
2724 * returned the next time the user does a read() or write().
2726 if (events
& COMEDI_CB_ERROR_MASK
)
2727 __comedi_set_subdevice_runflags(s
, COMEDI_SRF_ERROR
);
2729 if (async
->cb_mask
& events
) {
2730 wake_up_interruptible(&async
->wait_head
);
2731 si_code
= async
->cmd
.flags
& CMDF_WRITE
? POLL_OUT
: POLL_IN
;
2734 spin_unlock_irqrestore(&s
->spin_lock
, flags
);
2737 kill_fasync(&dev
->async_queue
, SIGIO
, si_code
);
2739 EXPORT_SYMBOL_GPL(comedi_event
);
2741 /* Note: the ->mutex is pre-locked on successful return */
2742 struct comedi_device
*comedi_alloc_board_minor(struct device
*hardware_device
)
2744 struct comedi_device
*dev
;
2745 struct device
*csdev
;
2748 dev
= kzalloc(sizeof(*dev
), GFP_KERNEL
);
2750 return ERR_PTR(-ENOMEM
);
2751 comedi_device_init(dev
);
2752 comedi_set_hw_dev(dev
, hardware_device
);
2753 mutex_lock(&dev
->mutex
);
2754 mutex_lock(&comedi_board_minor_table_lock
);
2755 for (i
= hardware_device
? comedi_num_legacy_minors
: 0;
2756 i
< COMEDI_NUM_BOARD_MINORS
; ++i
) {
2757 if (!comedi_board_minor_table
[i
]) {
2758 comedi_board_minor_table
[i
] = dev
;
2762 mutex_unlock(&comedi_board_minor_table_lock
);
2763 if (i
== COMEDI_NUM_BOARD_MINORS
) {
2764 mutex_unlock(&dev
->mutex
);
2765 comedi_device_cleanup(dev
);
2766 comedi_dev_put(dev
);
2767 dev_err(hardware_device
,
2768 "ran out of minor numbers for board device files\n");
2769 return ERR_PTR(-EBUSY
);
2772 csdev
= device_create(comedi_class
, hardware_device
,
2773 MKDEV(COMEDI_MAJOR
, i
), NULL
, "comedi%i", i
);
2775 dev
->class_dev
= get_device(csdev
);
2777 /* Note: dev->mutex needs to be unlocked by the caller. */
2781 void comedi_release_hardware_device(struct device
*hardware_device
)
2784 struct comedi_device
*dev
;
2786 for (minor
= comedi_num_legacy_minors
; minor
< COMEDI_NUM_BOARD_MINORS
;
2788 mutex_lock(&comedi_board_minor_table_lock
);
2789 dev
= comedi_board_minor_table
[minor
];
2790 if (dev
&& dev
->hw_dev
== hardware_device
) {
2791 comedi_board_minor_table
[minor
] = NULL
;
2792 mutex_unlock(&comedi_board_minor_table_lock
);
2793 comedi_free_board_dev(dev
);
2796 mutex_unlock(&comedi_board_minor_table_lock
);
2800 int comedi_alloc_subdevice_minor(struct comedi_subdevice
*s
)
2802 struct comedi_device
*dev
= s
->device
;
2803 struct device
*csdev
;
2806 mutex_lock(&comedi_subdevice_minor_table_lock
);
2807 for (i
= 0; i
< COMEDI_NUM_SUBDEVICE_MINORS
; ++i
) {
2808 if (!comedi_subdevice_minor_table
[i
]) {
2809 comedi_subdevice_minor_table
[i
] = s
;
2813 mutex_unlock(&comedi_subdevice_minor_table_lock
);
2814 if (i
== COMEDI_NUM_SUBDEVICE_MINORS
) {
2815 dev_err(dev
->class_dev
,
2816 "ran out of minor numbers for subdevice files\n");
2819 i
+= COMEDI_NUM_BOARD_MINORS
;
2821 csdev
= device_create(comedi_class
, dev
->class_dev
,
2822 MKDEV(COMEDI_MAJOR
, i
), NULL
, "comedi%i_subd%i",
2823 dev
->minor
, s
->index
);
2825 s
->class_dev
= csdev
;
2830 void comedi_free_subdevice_minor(struct comedi_subdevice
*s
)
2836 if (s
->minor
< COMEDI_NUM_BOARD_MINORS
||
2837 s
->minor
>= COMEDI_NUM_MINORS
)
2840 i
= s
->minor
- COMEDI_NUM_BOARD_MINORS
;
2841 mutex_lock(&comedi_subdevice_minor_table_lock
);
2842 if (s
== comedi_subdevice_minor_table
[i
])
2843 comedi_subdevice_minor_table
[i
] = NULL
;
2844 mutex_unlock(&comedi_subdevice_minor_table_lock
);
2846 device_destroy(comedi_class
, MKDEV(COMEDI_MAJOR
, s
->minor
));
2847 s
->class_dev
= NULL
;
2851 static void comedi_cleanup_board_minors(void)
2853 struct comedi_device
*dev
;
2856 for (i
= 0; i
< COMEDI_NUM_BOARD_MINORS
; i
++) {
2857 dev
= comedi_clear_board_minor(i
);
2858 comedi_free_board_dev(dev
);
2862 static int __init
comedi_init(void)
2867 pr_info("version " COMEDI_RELEASE
" - http://www.comedi.org\n");
2869 if (comedi_num_legacy_minors
< 0 ||
2870 comedi_num_legacy_minors
> COMEDI_NUM_BOARD_MINORS
) {
2871 pr_err("invalid value for module parameter \"comedi_num_legacy_minors\". Valid values are 0 through %i.\n",
2872 COMEDI_NUM_BOARD_MINORS
);
2876 retval
= register_chrdev_region(MKDEV(COMEDI_MAJOR
, 0),
2877 COMEDI_NUM_MINORS
, "comedi");
2880 cdev_init(&comedi_cdev
, &comedi_fops
);
2881 comedi_cdev
.owner
= THIS_MODULE
;
2883 retval
= kobject_set_name(&comedi_cdev
.kobj
, "comedi");
2885 unregister_chrdev_region(MKDEV(COMEDI_MAJOR
, 0),
2890 if (cdev_add(&comedi_cdev
, MKDEV(COMEDI_MAJOR
, 0), COMEDI_NUM_MINORS
)) {
2891 unregister_chrdev_region(MKDEV(COMEDI_MAJOR
, 0),
2895 comedi_class
= class_create(THIS_MODULE
, "comedi");
2896 if (IS_ERR(comedi_class
)) {
2897 pr_err("failed to create class\n");
2898 cdev_del(&comedi_cdev
);
2899 unregister_chrdev_region(MKDEV(COMEDI_MAJOR
, 0),
2901 return PTR_ERR(comedi_class
);
2904 comedi_class
->dev_groups
= comedi_dev_groups
;
2906 /* XXX requires /proc interface */
2909 /* create devices files for legacy/manual use */
2910 for (i
= 0; i
< comedi_num_legacy_minors
; i
++) {
2911 struct comedi_device
*dev
;
2913 dev
= comedi_alloc_board_minor(NULL
);
2915 comedi_cleanup_board_minors();
2916 cdev_del(&comedi_cdev
);
2917 unregister_chrdev_region(MKDEV(COMEDI_MAJOR
, 0),
2919 return PTR_ERR(dev
);
2921 /* comedi_alloc_board_minor() locked the mutex */
2922 mutex_unlock(&dev
->mutex
);
2927 module_init(comedi_init
);
2929 static void __exit
comedi_cleanup(void)
2931 comedi_cleanup_board_minors();
2932 class_destroy(comedi_class
);
2933 cdev_del(&comedi_cdev
);
2934 unregister_chrdev_region(MKDEV(COMEDI_MAJOR
, 0), COMEDI_NUM_MINORS
);
2936 comedi_proc_cleanup();
2938 module_exit(comedi_cleanup
);
2940 MODULE_AUTHOR("http://www.comedi.org");
2941 MODULE_DESCRIPTION("Comedi core module");
2942 MODULE_LICENSE("GPL");