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 struct
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 structure
135 * @dev: comedi_device struct
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 by 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 struct
671 * Return true if an asynchronous comedi command is active on the comedi
672 * subdevice, else return 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 struct
707 * Mark the subdevice as having a pointer to private data that can be
708 * automatically freed by the comedi core during the detach.
710 void comedi_set_spriv_auto_free(struct comedi_subdevice
*s
)
712 __comedi_set_subdevice_runflags(s
, COMEDI_SRF_FREE_SPRIV
);
714 EXPORT_SYMBOL_GPL(comedi_set_spriv_auto_free
);
717 * comedi_alloc_spriv - Allocate memory for the subdevice private data.
718 * @s: comedi_subdevice struct
719 * @size: size of the memory to allocate
721 * This also sets the subdevice runflags to allow the core to automatically
722 * free the private data during the detach.
724 void *comedi_alloc_spriv(struct comedi_subdevice
*s
, size_t size
)
726 s
->private = kzalloc(size
, GFP_KERNEL
);
728 comedi_set_spriv_auto_free(s
);
731 EXPORT_SYMBOL_GPL(comedi_alloc_spriv
);
734 * This function restores a subdevice to an idle state.
736 static void do_become_nonbusy(struct comedi_device
*dev
,
737 struct comedi_subdevice
*s
)
739 struct comedi_async
*async
= s
->async
;
741 comedi_update_subdevice_runflags(s
, COMEDI_SRF_RUNNING
, 0);
744 async
->inttrig
= NULL
;
745 kfree(async
->cmd
.chanlist
);
746 async
->cmd
.chanlist
= NULL
;
748 wake_up_interruptible_all(&async
->wait_head
);
750 dev_err(dev
->class_dev
,
751 "BUG: (?) do_become_nonbusy called with async=NULL\n");
756 static int do_cancel(struct comedi_device
*dev
, struct comedi_subdevice
*s
)
760 if (comedi_is_subdevice_running(s
) && s
->cancel
)
761 ret
= s
->cancel(dev
, s
);
763 do_become_nonbusy(dev
, s
);
768 void comedi_device_cancel_all(struct comedi_device
*dev
)
770 struct comedi_subdevice
*s
;
776 for (i
= 0; i
< dev
->n_subdevices
; i
++) {
777 s
= &dev
->subdevices
[i
];
783 static int is_device_busy(struct comedi_device
*dev
)
785 struct comedi_subdevice
*s
;
791 for (i
= 0; i
< dev
->n_subdevices
; i
++) {
792 s
= &dev
->subdevices
[i
];
795 if (s
->async
&& comedi_buf_is_mmapped(s
))
803 * COMEDI_DEVCONFIG ioctl
804 * attaches (and configures) or detaches a legacy device
807 * pointer to comedi_devconfig structure (NULL if detaching)
810 * comedi_devconfig structure (if attaching)
815 static int do_devconfig_ioctl(struct comedi_device
*dev
,
816 struct comedi_devconfig __user
*arg
)
818 struct comedi_devconfig it
;
820 if (!capable(CAP_SYS_ADMIN
))
824 if (is_device_busy(dev
))
827 struct module
*driver_module
= dev
->driver
->module
;
829 comedi_device_detach(dev
);
830 module_put(driver_module
);
835 if (copy_from_user(&it
, arg
, sizeof(it
)))
838 it
.board_name
[COMEDI_NAMELEN
- 1] = 0;
840 if (it
.options
[COMEDI_DEVCONF_AUX_DATA_LENGTH
]) {
841 dev_warn(dev
->class_dev
,
842 "comedi_config --init_data is deprecated\n");
846 if (dev
->minor
>= comedi_num_legacy_minors
)
847 /* don't re-use dynamically allocated comedi devices */
850 /* This increments the driver module count on success. */
851 return comedi_device_attach(dev
, &it
);
855 * COMEDI_BUFCONFIG ioctl
856 * buffer configuration
859 * pointer to comedi_bufconfig structure
862 * comedi_bufconfig structure
865 * modified comedi_bufconfig structure
867 static int do_bufconfig_ioctl(struct comedi_device
*dev
,
868 struct comedi_bufconfig __user
*arg
)
870 struct comedi_bufconfig bc
;
871 struct comedi_async
*async
;
872 struct comedi_subdevice
*s
;
875 if (copy_from_user(&bc
, arg
, sizeof(bc
)))
878 if (bc
.subdevice
>= dev
->n_subdevices
)
881 s
= &dev
->subdevices
[bc
.subdevice
];
885 dev_dbg(dev
->class_dev
,
886 "subdevice does not have async capability\n");
892 if (bc
.maximum_size
) {
893 if (!capable(CAP_SYS_ADMIN
))
896 async
->max_bufsize
= bc
.maximum_size
;
900 retval
= resize_async_buffer(dev
, s
, bc
.size
);
905 bc
.size
= async
->prealloc_bufsz
;
906 bc
.maximum_size
= async
->max_bufsize
;
909 if (copy_to_user(arg
, &bc
, sizeof(bc
)))
916 * COMEDI_DEVINFO ioctl
920 * pointer to comedi_devinfo structure
926 * comedi_devinfo structure
928 static int do_devinfo_ioctl(struct comedi_device
*dev
,
929 struct comedi_devinfo __user
*arg
,
932 struct comedi_subdevice
*s
;
933 struct comedi_devinfo devinfo
;
935 memset(&devinfo
, 0, sizeof(devinfo
));
937 /* fill devinfo structure */
938 devinfo
.version_code
= COMEDI_VERSION_CODE
;
939 devinfo
.n_subdevs
= dev
->n_subdevices
;
940 strlcpy(devinfo
.driver_name
, dev
->driver
->driver_name
, COMEDI_NAMELEN
);
941 strlcpy(devinfo
.board_name
, dev
->board_name
, COMEDI_NAMELEN
);
943 s
= comedi_file_read_subdevice(file
);
945 devinfo
.read_subdevice
= s
->index
;
947 devinfo
.read_subdevice
= -1;
949 s
= comedi_file_write_subdevice(file
);
951 devinfo
.write_subdevice
= s
->index
;
953 devinfo
.write_subdevice
= -1;
955 if (copy_to_user(arg
, &devinfo
, sizeof(devinfo
)))
962 * COMEDI_SUBDINFO ioctl
966 * pointer to array of comedi_subdinfo structures
972 * array of comedi_subdinfo structures
974 static int do_subdinfo_ioctl(struct comedi_device
*dev
,
975 struct comedi_subdinfo __user
*arg
, void *file
)
978 struct comedi_subdinfo
*tmp
, *us
;
979 struct comedi_subdevice
*s
;
981 tmp
= kcalloc(dev
->n_subdevices
, sizeof(*tmp
), GFP_KERNEL
);
985 /* fill subdinfo structs */
986 for (i
= 0; i
< dev
->n_subdevices
; i
++) {
987 s
= &dev
->subdevices
[i
];
991 us
->n_chan
= s
->n_chan
;
992 us
->subd_flags
= s
->subdev_flags
;
993 if (comedi_is_subdevice_running(s
))
994 us
->subd_flags
|= SDF_RUNNING
;
995 #define TIMER_nanosec 5 /* backwards compatibility */
996 us
->timer_type
= TIMER_nanosec
;
997 us
->len_chanlist
= s
->len_chanlist
;
998 us
->maxdata
= s
->maxdata
;
999 if (s
->range_table
) {
1001 (i
<< 24) | (0 << 16) | (s
->range_table
->length
);
1003 us
->range_type
= 0; /* XXX */
1007 us
->subd_flags
|= SDF_BUSY
;
1008 if (s
->busy
== file
)
1009 us
->subd_flags
|= SDF_BUSY_OWNER
;
1011 us
->subd_flags
|= SDF_LOCKED
;
1012 if (s
->lock
== file
)
1013 us
->subd_flags
|= SDF_LOCK_OWNER
;
1014 if (!s
->maxdata
&& s
->maxdata_list
)
1015 us
->subd_flags
|= SDF_MAXDATA
;
1016 if (s
->range_table_list
)
1017 us
->subd_flags
|= SDF_RANGETYPE
;
1019 us
->subd_flags
|= SDF_CMD
;
1021 if (s
->insn_bits
!= &insn_inval
)
1022 us
->insn_bits_support
= COMEDI_SUPPORTED
;
1024 us
->insn_bits_support
= COMEDI_UNSUPPORTED
;
1027 ret
= copy_to_user(arg
, tmp
, dev
->n_subdevices
* sizeof(*tmp
));
1031 return ret
? -EFAULT
: 0;
1035 * COMEDI_CHANINFO ioctl
1036 * subdevice channel info
1039 * pointer to comedi_chaninfo structure
1042 * comedi_chaninfo structure
1045 * array of maxdata values to chaninfo->maxdata_list if requested
1046 * array of range table lengths to chaninfo->range_table_list if requested
1048 static int do_chaninfo_ioctl(struct comedi_device
*dev
,
1049 struct comedi_chaninfo __user
*arg
)
1051 struct comedi_subdevice
*s
;
1052 struct comedi_chaninfo it
;
1054 if (copy_from_user(&it
, arg
, sizeof(it
)))
1057 if (it
.subdev
>= dev
->n_subdevices
)
1059 s
= &dev
->subdevices
[it
.subdev
];
1061 if (it
.maxdata_list
) {
1062 if (s
->maxdata
|| !s
->maxdata_list
)
1064 if (copy_to_user(it
.maxdata_list
, s
->maxdata_list
,
1065 s
->n_chan
* sizeof(unsigned int)))
1070 return -EINVAL
; /* flaglist not supported */
1075 if (!s
->range_table_list
)
1077 for (i
= 0; i
< s
->n_chan
; i
++) {
1080 x
= (dev
->minor
<< 28) | (it
.subdev
<< 24) | (i
<< 16) |
1081 (s
->range_table_list
[i
]->length
);
1082 if (put_user(x
, it
.rangelist
+ i
))
1091 * COMEDI_BUFINFO ioctl
1092 * buffer information
1095 * pointer to comedi_bufinfo structure
1098 * comedi_bufinfo structure
1101 * modified comedi_bufinfo structure
1103 static int do_bufinfo_ioctl(struct comedi_device
*dev
,
1104 struct comedi_bufinfo __user
*arg
, void *file
)
1106 struct comedi_bufinfo bi
;
1107 struct comedi_subdevice
*s
;
1108 struct comedi_async
*async
;
1110 if (copy_from_user(&bi
, arg
, sizeof(bi
)))
1113 if (bi
.subdevice
>= dev
->n_subdevices
)
1116 s
= &dev
->subdevices
[bi
.subdevice
];
1121 dev_dbg(dev
->class_dev
,
1122 "subdevice does not have async capability\n");
1123 bi
.buf_write_ptr
= 0;
1124 bi
.buf_read_ptr
= 0;
1125 bi
.buf_write_count
= 0;
1126 bi
.buf_read_count
= 0;
1128 bi
.bytes_written
= 0;
1133 bi
.bytes_written
= 0;
1134 goto copyback_position
;
1136 if (s
->busy
!= file
)
1139 if (bi
.bytes_read
&& !(async
->cmd
.flags
& CMDF_WRITE
)) {
1140 bi
.bytes_read
= comedi_buf_read_alloc(s
, bi
.bytes_read
);
1141 comedi_buf_read_free(s
, bi
.bytes_read
);
1143 if (comedi_is_subdevice_idle(s
) &&
1144 comedi_buf_n_bytes_ready(s
) == 0) {
1145 do_become_nonbusy(dev
, s
);
1149 if (bi
.bytes_written
&& (async
->cmd
.flags
& CMDF_WRITE
)) {
1151 comedi_buf_write_alloc(s
, bi
.bytes_written
);
1152 comedi_buf_write_free(s
, bi
.bytes_written
);
1156 bi
.buf_write_count
= async
->buf_write_count
;
1157 bi
.buf_write_ptr
= async
->buf_write_ptr
;
1158 bi
.buf_read_count
= async
->buf_read_count
;
1159 bi
.buf_read_ptr
= async
->buf_read_ptr
;
1162 if (copy_to_user(arg
, &bi
, sizeof(bi
)))
1168 static int check_insn_config_length(struct comedi_insn
*insn
,
1175 case INSN_CONFIG_DIO_OUTPUT
:
1176 case INSN_CONFIG_DIO_INPUT
:
1177 case INSN_CONFIG_DISARM
:
1178 case INSN_CONFIG_RESET
:
1182 case INSN_CONFIG_ARM
:
1183 case INSN_CONFIG_DIO_QUERY
:
1184 case INSN_CONFIG_BLOCK_SIZE
:
1185 case INSN_CONFIG_FILTER
:
1186 case INSN_CONFIG_SERIAL_CLOCK
:
1187 case INSN_CONFIG_BIDIRECTIONAL_DATA
:
1188 case INSN_CONFIG_ALT_SOURCE
:
1189 case INSN_CONFIG_SET_COUNTER_MODE
:
1190 case INSN_CONFIG_8254_READ_STATUS
:
1191 case INSN_CONFIG_SET_ROUTING
:
1192 case INSN_CONFIG_GET_ROUTING
:
1193 case INSN_CONFIG_GET_PWM_STATUS
:
1194 case INSN_CONFIG_PWM_SET_PERIOD
:
1195 case INSN_CONFIG_PWM_GET_PERIOD
:
1199 case INSN_CONFIG_SET_GATE_SRC
:
1200 case INSN_CONFIG_GET_GATE_SRC
:
1201 case INSN_CONFIG_SET_CLOCK_SRC
:
1202 case INSN_CONFIG_GET_CLOCK_SRC
:
1203 case INSN_CONFIG_SET_OTHER_SRC
:
1204 case INSN_CONFIG_GET_COUNTER_STATUS
:
1205 case INSN_CONFIG_PWM_SET_H_BRIDGE
:
1206 case INSN_CONFIG_PWM_GET_H_BRIDGE
:
1207 case INSN_CONFIG_GET_HARDWARE_BUFFER_SIZE
:
1211 case INSN_CONFIG_PWM_OUTPUT
:
1212 case INSN_CONFIG_ANALOG_TRIG
:
1216 case INSN_CONFIG_DIGITAL_TRIG
:
1221 * by default we allow the insn since we don't have checks for
1222 * all possible cases yet
1225 pr_warn("No check for data length of config insn id %i is implemented\n",
1227 pr_warn("Add a check to %s in %s\n", __func__
, __FILE__
);
1228 pr_warn("Assuming n=%i is correct\n", insn
->n
);
1234 static int parse_insn(struct comedi_device
*dev
, struct comedi_insn
*insn
,
1235 unsigned int *data
, void *file
)
1237 struct comedi_subdevice
*s
;
1241 if (insn
->insn
& INSN_MASK_SPECIAL
) {
1242 /* a non-subdevice instruction */
1244 switch (insn
->insn
) {
1254 do_gettimeofday(&tv
);
1255 data
[0] = tv
.tv_sec
;
1256 data
[1] = tv
.tv_usec
;
1262 if (insn
->n
!= 1 || data
[0] >= 100000) {
1266 udelay(data
[0] / 1000);
1274 if (insn
->subdev
>= dev
->n_subdevices
) {
1275 dev_dbg(dev
->class_dev
,
1276 "%d not usable subdevice\n",
1281 s
= &dev
->subdevices
[insn
->subdev
];
1283 dev_dbg(dev
->class_dev
, "no async\n");
1287 if (!s
->async
->inttrig
) {
1288 dev_dbg(dev
->class_dev
, "no inttrig\n");
1292 ret
= s
->async
->inttrig(dev
, s
, data
[0]);
1297 dev_dbg(dev
->class_dev
, "invalid insn\n");
1302 /* a subdevice instruction */
1303 unsigned int maxdata
;
1305 if (insn
->subdev
>= dev
->n_subdevices
) {
1306 dev_dbg(dev
->class_dev
, "subdevice %d out of range\n",
1311 s
= &dev
->subdevices
[insn
->subdev
];
1313 if (s
->type
== COMEDI_SUBD_UNUSED
) {
1314 dev_dbg(dev
->class_dev
, "%d not usable subdevice\n",
1320 /* are we locked? (ioctl lock) */
1321 if (s
->lock
&& s
->lock
!= file
) {
1322 dev_dbg(dev
->class_dev
, "device locked\n");
1327 ret
= comedi_check_chanlist(s
, 1, &insn
->chanspec
);
1330 dev_dbg(dev
->class_dev
, "bad chanspec\n");
1338 /* This looks arbitrary. It is. */
1339 s
->busy
= &parse_insn
;
1340 switch (insn
->insn
) {
1342 ret
= s
->insn_read(dev
, s
, insn
, data
);
1343 if (ret
== -ETIMEDOUT
) {
1344 dev_dbg(dev
->class_dev
,
1345 "subdevice %d read instruction timed out\n",
1350 maxdata
= s
->maxdata_list
1351 ? s
->maxdata_list
[CR_CHAN(insn
->chanspec
)]
1353 for (i
= 0; i
< insn
->n
; ++i
) {
1354 if (data
[i
] > maxdata
) {
1356 dev_dbg(dev
->class_dev
,
1357 "bad data value(s)\n");
1362 ret
= s
->insn_write(dev
, s
, insn
, data
);
1363 if (ret
== -ETIMEDOUT
) {
1364 dev_dbg(dev
->class_dev
,
1365 "subdevice %d write instruction timed out\n",
1375 * Most drivers ignore the base channel in
1376 * insn->chanspec. Fix this here if
1377 * the subdevice has <= 32 channels.
1379 unsigned int orig_mask
= data
[0];
1380 unsigned int shift
= 0;
1382 if (s
->n_chan
<= 32) {
1383 shift
= CR_CHAN(insn
->chanspec
);
1390 ret
= s
->insn_bits(dev
, s
, insn
, data
);
1391 data
[0] = orig_mask
;
1397 ret
= check_insn_config_length(insn
, data
);
1400 ret
= s
->insn_config(dev
, s
, insn
, data
);
1415 * COMEDI_INSNLIST ioctl
1416 * synchronous instruction list
1419 * pointer to comedi_insnlist structure
1422 * comedi_insnlist structure
1423 * array of comedi_insn structures from insnlist->insns pointer
1424 * data (for writes) from insns[].data pointers
1427 * data (for reads) to insns[].data pointers
1429 /* arbitrary limits */
1430 #define MAX_SAMPLES 256
1431 static int do_insnlist_ioctl(struct comedi_device
*dev
,
1432 struct comedi_insnlist __user
*arg
, void *file
)
1434 struct comedi_insnlist insnlist
;
1435 struct comedi_insn
*insns
= NULL
;
1436 unsigned int *data
= NULL
;
1440 if (copy_from_user(&insnlist
, arg
, sizeof(insnlist
)))
1443 data
= kmalloc_array(MAX_SAMPLES
, sizeof(unsigned int), GFP_KERNEL
);
1449 insns
= kcalloc(insnlist
.n_insns
, sizeof(*insns
), GFP_KERNEL
);
1455 if (copy_from_user(insns
, insnlist
.insns
,
1456 sizeof(*insns
) * insnlist
.n_insns
)) {
1457 dev_dbg(dev
->class_dev
, "copy_from_user failed\n");
1462 for (i
= 0; i
< insnlist
.n_insns
; i
++) {
1463 if (insns
[i
].n
> MAX_SAMPLES
) {
1464 dev_dbg(dev
->class_dev
,
1465 "number of samples too large\n");
1469 if (insns
[i
].insn
& INSN_MASK_WRITE
) {
1470 if (copy_from_user(data
, insns
[i
].data
,
1471 insns
[i
].n
* sizeof(unsigned int))) {
1472 dev_dbg(dev
->class_dev
,
1473 "copy_from_user failed\n");
1478 ret
= parse_insn(dev
, insns
+ i
, data
, file
);
1481 if (insns
[i
].insn
& INSN_MASK_READ
) {
1482 if (copy_to_user(insns
[i
].data
, data
,
1483 insns
[i
].n
* sizeof(unsigned int))) {
1484 dev_dbg(dev
->class_dev
,
1485 "copy_to_user failed\n");
1505 * synchronous instruction
1508 * pointer to comedi_insn structure
1511 * comedi_insn structure
1512 * data (for writes) from insn->data pointer
1515 * data (for reads) to insn->data pointer
1517 static int do_insn_ioctl(struct comedi_device
*dev
,
1518 struct comedi_insn __user
*arg
, void *file
)
1520 struct comedi_insn insn
;
1521 unsigned int *data
= NULL
;
1524 data
= kmalloc_array(MAX_SAMPLES
, sizeof(unsigned int), GFP_KERNEL
);
1530 if (copy_from_user(&insn
, arg
, sizeof(insn
))) {
1535 /* This is where the behavior of insn and insnlist deviate. */
1536 if (insn
.n
> MAX_SAMPLES
)
1537 insn
.n
= MAX_SAMPLES
;
1538 if (insn
.insn
& INSN_MASK_WRITE
) {
1539 if (copy_from_user(data
,
1541 insn
.n
* sizeof(unsigned int))) {
1546 ret
= parse_insn(dev
, &insn
, data
, file
);
1549 if (insn
.insn
& INSN_MASK_READ
) {
1550 if (copy_to_user(insn
.data
,
1552 insn
.n
* sizeof(unsigned int))) {
1565 static int __comedi_get_user_cmd(struct comedi_device
*dev
,
1566 struct comedi_cmd __user
*arg
,
1567 struct comedi_cmd
*cmd
)
1569 struct comedi_subdevice
*s
;
1571 if (copy_from_user(cmd
, arg
, sizeof(*cmd
))) {
1572 dev_dbg(dev
->class_dev
, "bad cmd address\n");
1576 if (cmd
->subdev
>= dev
->n_subdevices
) {
1577 dev_dbg(dev
->class_dev
, "%d no such subdevice\n", cmd
->subdev
);
1581 s
= &dev
->subdevices
[cmd
->subdev
];
1583 if (s
->type
== COMEDI_SUBD_UNUSED
) {
1584 dev_dbg(dev
->class_dev
, "%d not valid subdevice\n",
1589 if (!s
->do_cmd
|| !s
->do_cmdtest
|| !s
->async
) {
1590 dev_dbg(dev
->class_dev
,
1591 "subdevice %d does not support commands\n",
1596 /* make sure channel/gain list isn't too long */
1597 if (cmd
->chanlist_len
> s
->len_chanlist
) {
1598 dev_dbg(dev
->class_dev
, "channel/gain list too long %d > %d\n",
1599 cmd
->chanlist_len
, s
->len_chanlist
);
1604 * Set the CMDF_WRITE flag to the correct state if the subdevice
1605 * supports only "read" commands or only "write" commands.
1607 switch (s
->subdev_flags
& (SDF_CMD_READ
| SDF_CMD_WRITE
)) {
1609 cmd
->flags
&= ~CMDF_WRITE
;
1612 cmd
->flags
|= CMDF_WRITE
;
1621 static int __comedi_get_user_chanlist(struct comedi_device
*dev
,
1622 struct comedi_subdevice
*s
,
1623 unsigned int __user
*user_chanlist
,
1624 struct comedi_cmd
*cmd
)
1626 unsigned int *chanlist
;
1629 cmd
->chanlist
= NULL
;
1630 chanlist
= memdup_user(user_chanlist
,
1631 cmd
->chanlist_len
* sizeof(unsigned int));
1632 if (IS_ERR(chanlist
))
1633 return PTR_ERR(chanlist
);
1635 /* make sure each element in channel/gain list is valid */
1636 ret
= comedi_check_chanlist(s
, cmd
->chanlist_len
, chanlist
);
1642 cmd
->chanlist
= chanlist
;
1649 * asynchronous acquisition command set-up
1652 * pointer to comedi_cmd structure
1655 * comedi_cmd structure
1656 * channel/range list from cmd->chanlist pointer
1659 * possibly modified comedi_cmd structure (when -EAGAIN returned)
1661 static int do_cmd_ioctl(struct comedi_device
*dev
,
1662 struct comedi_cmd __user
*arg
, void *file
)
1664 struct comedi_cmd cmd
;
1665 struct comedi_subdevice
*s
;
1666 struct comedi_async
*async
;
1667 unsigned int __user
*user_chanlist
;
1670 /* get the user's cmd and do some simple validation */
1671 ret
= __comedi_get_user_cmd(dev
, arg
, &cmd
);
1675 /* save user's chanlist pointer so it can be restored later */
1676 user_chanlist
= (unsigned int __user
*)cmd
.chanlist
;
1678 s
= &dev
->subdevices
[cmd
.subdev
];
1681 /* are we locked? (ioctl lock) */
1682 if (s
->lock
&& s
->lock
!= file
) {
1683 dev_dbg(dev
->class_dev
, "subdevice locked\n");
1689 dev_dbg(dev
->class_dev
, "subdevice busy\n");
1693 /* make sure channel/gain list isn't too short */
1694 if (cmd
.chanlist_len
< 1) {
1695 dev_dbg(dev
->class_dev
, "channel/gain list too short %u < 1\n",
1701 async
->cmd
.data
= NULL
;
1703 /* load channel/gain list */
1704 ret
= __comedi_get_user_chanlist(dev
, s
, user_chanlist
, &async
->cmd
);
1708 ret
= s
->do_cmdtest(dev
, s
, &async
->cmd
);
1710 if (async
->cmd
.flags
& CMDF_BOGUS
|| ret
) {
1711 dev_dbg(dev
->class_dev
, "test returned %d\n", ret
);
1713 /* restore chanlist pointer before copying back */
1714 cmd
.chanlist
= (unsigned int __force
*)user_chanlist
;
1716 if (copy_to_user(arg
, &cmd
, sizeof(cmd
))) {
1717 dev_dbg(dev
->class_dev
, "fault writing cmd\n");
1725 if (!async
->prealloc_bufsz
) {
1727 dev_dbg(dev
->class_dev
, "no buffer (?)\n");
1731 comedi_buf_reset(s
);
1733 async
->cb_mask
= COMEDI_CB_BLOCK
| COMEDI_CB_CANCEL_MASK
;
1734 if (async
->cmd
.flags
& CMDF_WAKE_EOS
)
1735 async
->cb_mask
|= COMEDI_CB_EOS
;
1737 comedi_update_subdevice_runflags(s
, COMEDI_SRF_BUSY_MASK
,
1738 COMEDI_SRF_RUNNING
);
1741 * Set s->busy _after_ setting COMEDI_SRF_RUNNING flag to avoid
1742 * race with comedi_read() or comedi_write().
1745 ret
= s
->do_cmd(dev
, s
);
1750 do_become_nonbusy(dev
, s
);
1756 * COMEDI_CMDTEST ioctl
1757 * asynchronous acquisition command testing
1760 * pointer to comedi_cmd structure
1763 * comedi_cmd structure
1764 * channel/range list from cmd->chanlist pointer
1767 * possibly modified comedi_cmd structure
1769 static int do_cmdtest_ioctl(struct comedi_device
*dev
,
1770 struct comedi_cmd __user
*arg
, void *file
)
1772 struct comedi_cmd cmd
;
1773 struct comedi_subdevice
*s
;
1774 unsigned int __user
*user_chanlist
;
1777 /* get the user's cmd and do some simple validation */
1778 ret
= __comedi_get_user_cmd(dev
, arg
, &cmd
);
1782 /* save user's chanlist pointer so it can be restored later */
1783 user_chanlist
= (unsigned int __user
*)cmd
.chanlist
;
1785 s
= &dev
->subdevices
[cmd
.subdev
];
1787 /* user_chanlist can be NULL for COMEDI_CMDTEST ioctl */
1788 if (user_chanlist
) {
1789 /* load channel/gain list */
1790 ret
= __comedi_get_user_chanlist(dev
, s
, user_chanlist
, &cmd
);
1795 ret
= s
->do_cmdtest(dev
, s
, &cmd
);
1797 kfree(cmd
.chanlist
); /* free kernel copy of user chanlist */
1799 /* restore chanlist pointer before copying back */
1800 cmd
.chanlist
= (unsigned int __force
*)user_chanlist
;
1802 if (copy_to_user(arg
, &cmd
, sizeof(cmd
))) {
1803 dev_dbg(dev
->class_dev
, "bad cmd address\n");
1823 static int do_lock_ioctl(struct comedi_device
*dev
, unsigned long arg
,
1827 unsigned long flags
;
1828 struct comedi_subdevice
*s
;
1830 if (arg
>= dev
->n_subdevices
)
1832 s
= &dev
->subdevices
[arg
];
1834 spin_lock_irqsave(&s
->spin_lock
, flags
);
1835 if (s
->busy
|| s
->lock
)
1839 spin_unlock_irqrestore(&s
->spin_lock
, flags
);
1845 * COMEDI_UNLOCK ioctl
1857 static int do_unlock_ioctl(struct comedi_device
*dev
, unsigned long arg
,
1860 struct comedi_subdevice
*s
;
1862 if (arg
>= dev
->n_subdevices
)
1864 s
= &dev
->subdevices
[arg
];
1869 if (s
->lock
&& s
->lock
!= file
)
1872 if (s
->lock
== file
)
1879 * COMEDI_CANCEL ioctl
1880 * cancel asynchronous acquisition
1891 static int do_cancel_ioctl(struct comedi_device
*dev
, unsigned long arg
,
1894 struct comedi_subdevice
*s
;
1896 if (arg
>= dev
->n_subdevices
)
1898 s
= &dev
->subdevices
[arg
];
1905 if (s
->busy
!= file
)
1908 return do_cancel(dev
, s
);
1913 * instructs driver to synchronize buffers
1924 static int do_poll_ioctl(struct comedi_device
*dev
, unsigned long arg
,
1927 struct comedi_subdevice
*s
;
1929 if (arg
>= dev
->n_subdevices
)
1931 s
= &dev
->subdevices
[arg
];
1936 if (s
->busy
!= file
)
1940 return s
->poll(dev
, s
);
1946 * COMEDI_SETRSUBD ioctl
1947 * sets the current "read" subdevice on a per-file basis
1958 static int do_setrsubd_ioctl(struct comedi_device
*dev
, unsigned long arg
,
1961 struct comedi_file
*cfp
= file
->private_data
;
1962 struct comedi_subdevice
*s_old
, *s_new
;
1964 if (arg
>= dev
->n_subdevices
)
1967 s_new
= &dev
->subdevices
[arg
];
1968 s_old
= comedi_file_read_subdevice(file
);
1970 return 0; /* no change */
1972 if (!(s_new
->subdev_flags
& SDF_CMD_READ
))
1976 * Check the file isn't still busy handling a "read" command on the
1977 * old subdevice (if any).
1979 if (s_old
&& s_old
->busy
== file
&& s_old
->async
&&
1980 !(s_old
->async
->cmd
.flags
& CMDF_WRITE
))
1983 ACCESS_ONCE(cfp
->read_subdev
) = s_new
;
1988 * COMEDI_SETWSUBD ioctl
1989 * sets the current "write" subdevice on a per-file basis
2000 static int do_setwsubd_ioctl(struct comedi_device
*dev
, unsigned long arg
,
2003 struct comedi_file
*cfp
= file
->private_data
;
2004 struct comedi_subdevice
*s_old
, *s_new
;
2006 if (arg
>= dev
->n_subdevices
)
2009 s_new
= &dev
->subdevices
[arg
];
2010 s_old
= comedi_file_write_subdevice(file
);
2012 return 0; /* no change */
2014 if (!(s_new
->subdev_flags
& SDF_CMD_WRITE
))
2018 * Check the file isn't still busy handling a "write" command on the
2019 * old subdevice (if any).
2021 if (s_old
&& s_old
->busy
== file
&& s_old
->async
&&
2022 (s_old
->async
->cmd
.flags
& CMDF_WRITE
))
2025 ACCESS_ONCE(cfp
->write_subdev
) = s_new
;
2029 static long comedi_unlocked_ioctl(struct file
*file
, unsigned int cmd
,
2032 unsigned minor
= iminor(file_inode(file
));
2033 struct comedi_file
*cfp
= file
->private_data
;
2034 struct comedi_device
*dev
= cfp
->dev
;
2037 mutex_lock(&dev
->mutex
);
2040 * Device config is special, because it must work on
2041 * an unconfigured device.
2043 if (cmd
== COMEDI_DEVCONFIG
) {
2044 if (minor
>= COMEDI_NUM_BOARD_MINORS
) {
2045 /* Device config not appropriate on non-board minors. */
2049 rc
= do_devconfig_ioctl(dev
,
2050 (struct comedi_devconfig __user
*)arg
);
2053 dev
->minor
>= comedi_num_legacy_minors
) {
2055 * Successfully unconfigured a dynamically
2056 * allocated device. Try and remove it.
2058 if (comedi_clear_board_dev(dev
)) {
2059 mutex_unlock(&dev
->mutex
);
2060 comedi_free_board_dev(dev
);
2068 if (!dev
->attached
) {
2069 dev_dbg(dev
->class_dev
, "no driver attached\n");
2075 case COMEDI_BUFCONFIG
:
2076 rc
= do_bufconfig_ioctl(dev
,
2077 (struct comedi_bufconfig __user
*)arg
);
2079 case COMEDI_DEVINFO
:
2080 rc
= do_devinfo_ioctl(dev
, (struct comedi_devinfo __user
*)arg
,
2083 case COMEDI_SUBDINFO
:
2084 rc
= do_subdinfo_ioctl(dev
,
2085 (struct comedi_subdinfo __user
*)arg
,
2088 case COMEDI_CHANINFO
:
2089 rc
= do_chaninfo_ioctl(dev
, (void __user
*)arg
);
2091 case COMEDI_RANGEINFO
:
2092 rc
= do_rangeinfo_ioctl(dev
, (void __user
*)arg
);
2094 case COMEDI_BUFINFO
:
2095 rc
= do_bufinfo_ioctl(dev
,
2096 (struct comedi_bufinfo __user
*)arg
,
2100 rc
= do_lock_ioctl(dev
, arg
, file
);
2103 rc
= do_unlock_ioctl(dev
, arg
, file
);
2106 rc
= do_cancel_ioctl(dev
, arg
, file
);
2109 rc
= do_cmd_ioctl(dev
, (struct comedi_cmd __user
*)arg
, file
);
2111 case COMEDI_CMDTEST
:
2112 rc
= do_cmdtest_ioctl(dev
, (struct comedi_cmd __user
*)arg
,
2115 case COMEDI_INSNLIST
:
2116 rc
= do_insnlist_ioctl(dev
,
2117 (struct comedi_insnlist __user
*)arg
,
2121 rc
= do_insn_ioctl(dev
, (struct comedi_insn __user
*)arg
,
2125 rc
= do_poll_ioctl(dev
, arg
, file
);
2127 case COMEDI_SETRSUBD
:
2128 rc
= do_setrsubd_ioctl(dev
, arg
, file
);
2130 case COMEDI_SETWSUBD
:
2131 rc
= do_setwsubd_ioctl(dev
, arg
, file
);
2139 mutex_unlock(&dev
->mutex
);
2143 static void comedi_vm_open(struct vm_area_struct
*area
)
2145 struct comedi_buf_map
*bm
;
2147 bm
= area
->vm_private_data
;
2148 comedi_buf_map_get(bm
);
2151 static void comedi_vm_close(struct vm_area_struct
*area
)
2153 struct comedi_buf_map
*bm
;
2155 bm
= area
->vm_private_data
;
2156 comedi_buf_map_put(bm
);
2159 static const struct vm_operations_struct comedi_vm_ops
= {
2160 .open
= comedi_vm_open
,
2161 .close
= comedi_vm_close
,
2164 static int comedi_mmap(struct file
*file
, struct vm_area_struct
*vma
)
2166 struct comedi_file
*cfp
= file
->private_data
;
2167 struct comedi_device
*dev
= cfp
->dev
;
2168 struct comedi_subdevice
*s
;
2169 struct comedi_async
*async
;
2170 struct comedi_buf_map
*bm
= NULL
;
2171 unsigned long start
= vma
->vm_start
;
2178 * 'trylock' avoids circular dependency with current->mm->mmap_sem
2179 * and down-reading &dev->attach_lock should normally succeed without
2180 * contention unless the device is in the process of being attached
2183 if (!down_read_trylock(&dev
->attach_lock
))
2186 if (!dev
->attached
) {
2187 dev_dbg(dev
->class_dev
, "no driver attached\n");
2192 if (vma
->vm_flags
& VM_WRITE
)
2193 s
= comedi_file_write_subdevice(file
);
2195 s
= comedi_file_read_subdevice(file
);
2207 if (vma
->vm_pgoff
!= 0) {
2208 dev_dbg(dev
->class_dev
, "mmap() offset must be 0.\n");
2213 size
= vma
->vm_end
- vma
->vm_start
;
2214 if (size
> async
->prealloc_bufsz
) {
2218 if (size
& (~PAGE_MASK
)) {
2223 n_pages
= size
>> PAGE_SHIFT
;
2225 /* get reference to current buf map (if any) */
2226 bm
= comedi_buf_map_from_subdev_get(s
);
2227 if (!bm
|| n_pages
> bm
->n_pages
) {
2231 for (i
= 0; i
< n_pages
; ++i
) {
2232 struct comedi_buf_page
*buf
= &bm
->page_list
[i
];
2234 if (remap_pfn_range(vma
, start
,
2235 page_to_pfn(virt_to_page(buf
->virt_addr
)),
2236 PAGE_SIZE
, PAGE_SHARED
)) {
2243 vma
->vm_ops
= &comedi_vm_ops
;
2244 vma
->vm_private_data
= bm
;
2246 vma
->vm_ops
->open(vma
);
2250 up_read(&dev
->attach_lock
);
2251 comedi_buf_map_put(bm
); /* put reference to buf map - okay if NULL */
2255 static unsigned int comedi_poll(struct file
*file
, poll_table
*wait
)
2257 unsigned int mask
= 0;
2258 struct comedi_file
*cfp
= file
->private_data
;
2259 struct comedi_device
*dev
= cfp
->dev
;
2260 struct comedi_subdevice
*s
;
2262 mutex_lock(&dev
->mutex
);
2264 if (!dev
->attached
) {
2265 dev_dbg(dev
->class_dev
, "no driver attached\n");
2269 s
= comedi_file_read_subdevice(file
);
2270 if (s
&& s
->async
) {
2271 poll_wait(file
, &s
->async
->wait_head
, wait
);
2272 if (!s
->busy
|| !comedi_is_subdevice_running(s
) ||
2273 (s
->async
->cmd
.flags
& CMDF_WRITE
) ||
2274 comedi_buf_read_n_available(s
) > 0)
2275 mask
|= POLLIN
| POLLRDNORM
;
2278 s
= comedi_file_write_subdevice(file
);
2279 if (s
&& s
->async
) {
2280 unsigned int bps
= comedi_bytes_per_sample(s
);
2282 poll_wait(file
, &s
->async
->wait_head
, wait
);
2283 comedi_buf_write_alloc(s
, s
->async
->prealloc_bufsz
);
2284 if (!s
->busy
|| !comedi_is_subdevice_running(s
) ||
2285 !(s
->async
->cmd
.flags
& CMDF_WRITE
) ||
2286 comedi_buf_write_n_allocated(s
) >= bps
)
2287 mask
|= POLLOUT
| POLLWRNORM
;
2291 mutex_unlock(&dev
->mutex
);
2295 static ssize_t
comedi_write(struct file
*file
, const char __user
*buf
,
2296 size_t nbytes
, loff_t
*offset
)
2298 struct comedi_subdevice
*s
;
2299 struct comedi_async
*async
;
2300 int n
, m
, count
= 0, retval
= 0;
2301 DECLARE_WAITQUEUE(wait
, current
);
2302 struct comedi_file
*cfp
= file
->private_data
;
2303 struct comedi_device
*dev
= cfp
->dev
;
2304 bool on_wait_queue
= false;
2306 unsigned int old_detach_count
;
2308 /* Protect against device detachment during operation. */
2309 down_read(&dev
->attach_lock
);
2310 attach_locked
= true;
2311 old_detach_count
= dev
->detach_count
;
2313 if (!dev
->attached
) {
2314 dev_dbg(dev
->class_dev
, "no driver attached\n");
2319 s
= comedi_file_write_subdevice(file
);
2320 if (!s
|| !s
->async
) {
2327 if (!s
->busy
|| !nbytes
)
2329 if (s
->busy
!= file
) {
2333 if (!(async
->cmd
.flags
& CMDF_WRITE
)) {
2338 add_wait_queue(&async
->wait_head
, &wait
);
2339 on_wait_queue
= true;
2340 while (nbytes
> 0 && !retval
) {
2343 set_current_state(TASK_INTERRUPTIBLE
);
2345 runflags
= comedi_get_subdevice_runflags(s
);
2346 if (!comedi_is_runflags_running(runflags
)) {
2348 struct comedi_subdevice
*new_s
;
2350 if (comedi_is_runflags_in_error(runflags
))
2355 * To avoid deadlock, cannot acquire dev->mutex
2356 * while dev->attach_lock is held. Need to
2357 * remove task from the async wait queue before
2358 * releasing dev->attach_lock, as it might not
2359 * be valid afterwards.
2361 remove_wait_queue(&async
->wait_head
, &wait
);
2362 on_wait_queue
= false;
2363 up_read(&dev
->attach_lock
);
2364 attach_locked
= false;
2365 mutex_lock(&dev
->mutex
);
2367 * Become non-busy unless things have changed
2368 * behind our back. Checking dev->detach_count
2369 * is unchanged ought to be sufficient (unless
2370 * there have been 2**32 detaches in the
2371 * meantime!), but check the subdevice pointer
2372 * as well just in case.
2374 new_s
= comedi_file_write_subdevice(file
);
2375 if (dev
->attached
&&
2376 old_detach_count
== dev
->detach_count
&&
2377 s
== new_s
&& new_s
->async
== async
)
2378 do_become_nonbusy(dev
, s
);
2379 mutex_unlock(&dev
->mutex
);
2387 if (async
->buf_write_ptr
+ m
> async
->prealloc_bufsz
)
2388 m
= async
->prealloc_bufsz
- async
->buf_write_ptr
;
2389 comedi_buf_write_alloc(s
, async
->prealloc_bufsz
);
2390 if (m
> comedi_buf_write_n_allocated(s
))
2391 m
= comedi_buf_write_n_allocated(s
);
2396 if (file
->f_flags
& O_NONBLOCK
) {
2401 if (signal_pending(current
)) {
2402 retval
= -ERESTARTSYS
;
2407 if (s
->busy
!= file
) {
2411 if (!(async
->cmd
.flags
& CMDF_WRITE
)) {
2418 m
= copy_from_user(async
->prealloc_buf
+ async
->buf_write_ptr
,
2424 comedi_buf_write_free(s
, n
);
2430 break; /* makes device work like a pipe */
2434 remove_wait_queue(&async
->wait_head
, &wait
);
2435 set_current_state(TASK_RUNNING
);
2437 up_read(&dev
->attach_lock
);
2439 return count
? count
: retval
;
2442 static ssize_t
comedi_read(struct file
*file
, char __user
*buf
, size_t nbytes
,
2445 struct comedi_subdevice
*s
;
2446 struct comedi_async
*async
;
2447 int n
, m
, count
= 0, retval
= 0;
2448 DECLARE_WAITQUEUE(wait
, current
);
2449 struct comedi_file
*cfp
= file
->private_data
;
2450 struct comedi_device
*dev
= cfp
->dev
;
2451 unsigned int old_detach_count
;
2452 bool become_nonbusy
= false;
2455 /* Protect against device detachment during operation. */
2456 down_read(&dev
->attach_lock
);
2457 attach_locked
= true;
2458 old_detach_count
= dev
->detach_count
;
2460 if (!dev
->attached
) {
2461 dev_dbg(dev
->class_dev
, "no driver attached\n");
2466 s
= comedi_file_read_subdevice(file
);
2467 if (!s
|| !s
->async
) {
2473 if (!s
->busy
|| !nbytes
)
2475 if (s
->busy
!= file
) {
2479 if (async
->cmd
.flags
& CMDF_WRITE
) {
2484 add_wait_queue(&async
->wait_head
, &wait
);
2485 while (nbytes
> 0 && !retval
) {
2486 set_current_state(TASK_INTERRUPTIBLE
);
2490 m
= comedi_buf_read_n_available(s
);
2491 if (async
->buf_read_ptr
+ m
> async
->prealloc_bufsz
)
2492 m
= async
->prealloc_bufsz
- async
->buf_read_ptr
;
2497 unsigned runflags
= comedi_get_subdevice_runflags(s
);
2499 if (!comedi_is_runflags_running(runflags
)) {
2500 if (comedi_is_runflags_in_error(runflags
))
2504 become_nonbusy
= true;
2507 if (file
->f_flags
& O_NONBLOCK
) {
2512 if (signal_pending(current
)) {
2513 retval
= -ERESTARTSYS
;
2520 if (s
->busy
!= file
) {
2524 if (async
->cmd
.flags
& CMDF_WRITE
) {
2530 m
= copy_to_user(buf
, async
->prealloc_buf
+
2531 async
->buf_read_ptr
, n
);
2537 comedi_buf_read_alloc(s
, n
);
2538 comedi_buf_read_free(s
, n
);
2544 break; /* makes device work like a pipe */
2546 remove_wait_queue(&async
->wait_head
, &wait
);
2547 set_current_state(TASK_RUNNING
);
2548 if (become_nonbusy
|| comedi_is_subdevice_idle(s
)) {
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 new_s
= comedi_file_read_subdevice(file
);
2566 if (dev
->attached
&& old_detach_count
== dev
->detach_count
&&
2567 s
== new_s
&& new_s
->async
== async
) {
2568 if (become_nonbusy
|| comedi_buf_n_bytes_ready(s
) == 0)
2569 do_become_nonbusy(dev
, s
);
2571 mutex_unlock(&dev
->mutex
);
2575 up_read(&dev
->attach_lock
);
2577 return count
? count
: retval
;
2580 static int comedi_open(struct inode
*inode
, struct file
*file
)
2582 const unsigned minor
= iminor(inode
);
2583 struct comedi_file
*cfp
;
2584 struct comedi_device
*dev
= comedi_dev_get_from_minor(minor
);
2588 pr_debug("invalid minor number\n");
2592 cfp
= kzalloc(sizeof(*cfp
), GFP_KERNEL
);
2598 mutex_lock(&dev
->mutex
);
2599 if (!dev
->attached
&& !capable(CAP_SYS_ADMIN
)) {
2600 dev_dbg(dev
->class_dev
, "not attached and not CAP_SYS_ADMIN\n");
2604 if (dev
->attached
&& dev
->use_count
== 0) {
2605 if (!try_module_get(dev
->driver
->module
)) {
2610 rc
= dev
->open(dev
);
2612 module_put(dev
->driver
->module
);
2619 file
->private_data
= cfp
;
2620 comedi_file_reset(file
);
2624 mutex_unlock(&dev
->mutex
);
2626 comedi_dev_put(dev
);
2632 static int comedi_fasync(int fd
, struct file
*file
, int on
)
2634 struct comedi_file
*cfp
= file
->private_data
;
2635 struct comedi_device
*dev
= cfp
->dev
;
2637 return fasync_helper(fd
, file
, on
, &dev
->async_queue
);
2640 static int comedi_close(struct inode
*inode
, struct file
*file
)
2642 struct comedi_file
*cfp
= file
->private_data
;
2643 struct comedi_device
*dev
= cfp
->dev
;
2644 struct comedi_subdevice
*s
= NULL
;
2647 mutex_lock(&dev
->mutex
);
2649 if (dev
->subdevices
) {
2650 for (i
= 0; i
< dev
->n_subdevices
; i
++) {
2651 s
= &dev
->subdevices
[i
];
2653 if (s
->busy
== file
)
2655 if (s
->lock
== file
)
2659 if (dev
->attached
&& dev
->use_count
== 1) {
2662 module_put(dev
->driver
->module
);
2667 mutex_unlock(&dev
->mutex
);
2668 comedi_dev_put(dev
);
2674 static const struct file_operations comedi_fops
= {
2675 .owner
= THIS_MODULE
,
2676 .unlocked_ioctl
= comedi_unlocked_ioctl
,
2677 .compat_ioctl
= comedi_compat_ioctl
,
2678 .open
= comedi_open
,
2679 .release
= comedi_close
,
2680 .read
= comedi_read
,
2681 .write
= comedi_write
,
2682 .mmap
= comedi_mmap
,
2683 .poll
= comedi_poll
,
2684 .fasync
= comedi_fasync
,
2685 .llseek
= noop_llseek
,
2689 * comedi_event - handle events for asynchronous comedi command
2690 * @dev: comedi_device struct
2691 * @s: comedi_subdevice struct associated with dev
2692 * Context: interrupt (usually), s->spin_lock spin-lock not held
2694 * If an asynchronous comedi command is active on the subdevice, process
2695 * any COMEDI_CB_... event flags that have been set, usually by an
2696 * interrupt handler. These may change the run state of the asynchronous
2697 * command, wake a task, and/or send a SIGIO signal.
2699 void comedi_event(struct comedi_device
*dev
, struct comedi_subdevice
*s
)
2701 struct comedi_async
*async
= s
->async
;
2702 unsigned int events
;
2704 unsigned long flags
;
2706 spin_lock_irqsave(&s
->spin_lock
, flags
);
2708 events
= async
->events
;
2710 if (!__comedi_is_subdevice_running(s
)) {
2711 spin_unlock_irqrestore(&s
->spin_lock
, flags
);
2715 if (events
& COMEDI_CB_CANCEL_MASK
)
2716 __comedi_clear_subdevice_runflags(s
, COMEDI_SRF_RUNNING
);
2719 * Remember if an error event has occurred, so an error can be
2720 * returned the next time the user does a read() or write().
2722 if (events
& COMEDI_CB_ERROR_MASK
)
2723 __comedi_set_subdevice_runflags(s
, COMEDI_SRF_ERROR
);
2725 if (async
->cb_mask
& events
) {
2726 wake_up_interruptible(&async
->wait_head
);
2727 si_code
= async
->cmd
.flags
& CMDF_WRITE
? POLL_OUT
: POLL_IN
;
2730 spin_unlock_irqrestore(&s
->spin_lock
, flags
);
2733 kill_fasync(&dev
->async_queue
, SIGIO
, si_code
);
2735 EXPORT_SYMBOL_GPL(comedi_event
);
2737 /* Note: the ->mutex is pre-locked on successful return */
2738 struct comedi_device
*comedi_alloc_board_minor(struct device
*hardware_device
)
2740 struct comedi_device
*dev
;
2741 struct device
*csdev
;
2744 dev
= kzalloc(sizeof(*dev
), GFP_KERNEL
);
2746 return ERR_PTR(-ENOMEM
);
2747 comedi_device_init(dev
);
2748 comedi_set_hw_dev(dev
, hardware_device
);
2749 mutex_lock(&dev
->mutex
);
2750 mutex_lock(&comedi_board_minor_table_lock
);
2751 for (i
= hardware_device
? comedi_num_legacy_minors
: 0;
2752 i
< COMEDI_NUM_BOARD_MINORS
; ++i
) {
2753 if (!comedi_board_minor_table
[i
]) {
2754 comedi_board_minor_table
[i
] = dev
;
2758 mutex_unlock(&comedi_board_minor_table_lock
);
2759 if (i
== COMEDI_NUM_BOARD_MINORS
) {
2760 mutex_unlock(&dev
->mutex
);
2761 comedi_device_cleanup(dev
);
2762 comedi_dev_put(dev
);
2763 dev_err(hardware_device
,
2764 "ran out of minor numbers for board device files\n");
2765 return ERR_PTR(-EBUSY
);
2768 csdev
= device_create(comedi_class
, hardware_device
,
2769 MKDEV(COMEDI_MAJOR
, i
), NULL
, "comedi%i", i
);
2771 dev
->class_dev
= get_device(csdev
);
2773 /* Note: dev->mutex needs to be unlocked by the caller. */
2777 void comedi_release_hardware_device(struct device
*hardware_device
)
2780 struct comedi_device
*dev
;
2782 for (minor
= comedi_num_legacy_minors
; minor
< COMEDI_NUM_BOARD_MINORS
;
2784 mutex_lock(&comedi_board_minor_table_lock
);
2785 dev
= comedi_board_minor_table
[minor
];
2786 if (dev
&& dev
->hw_dev
== hardware_device
) {
2787 comedi_board_minor_table
[minor
] = NULL
;
2788 mutex_unlock(&comedi_board_minor_table_lock
);
2789 comedi_free_board_dev(dev
);
2792 mutex_unlock(&comedi_board_minor_table_lock
);
2796 int comedi_alloc_subdevice_minor(struct comedi_subdevice
*s
)
2798 struct comedi_device
*dev
= s
->device
;
2799 struct device
*csdev
;
2802 mutex_lock(&comedi_subdevice_minor_table_lock
);
2803 for (i
= 0; i
< COMEDI_NUM_SUBDEVICE_MINORS
; ++i
) {
2804 if (!comedi_subdevice_minor_table
[i
]) {
2805 comedi_subdevice_minor_table
[i
] = s
;
2809 mutex_unlock(&comedi_subdevice_minor_table_lock
);
2810 if (i
== COMEDI_NUM_SUBDEVICE_MINORS
) {
2811 dev_err(dev
->class_dev
,
2812 "ran out of minor numbers for subdevice files\n");
2815 i
+= COMEDI_NUM_BOARD_MINORS
;
2817 csdev
= device_create(comedi_class
, dev
->class_dev
,
2818 MKDEV(COMEDI_MAJOR
, i
), NULL
, "comedi%i_subd%i",
2819 dev
->minor
, s
->index
);
2821 s
->class_dev
= csdev
;
2826 void comedi_free_subdevice_minor(struct comedi_subdevice
*s
)
2832 if (s
->minor
< COMEDI_NUM_BOARD_MINORS
||
2833 s
->minor
>= COMEDI_NUM_MINORS
)
2836 i
= s
->minor
- COMEDI_NUM_BOARD_MINORS
;
2837 mutex_lock(&comedi_subdevice_minor_table_lock
);
2838 if (s
== comedi_subdevice_minor_table
[i
])
2839 comedi_subdevice_minor_table
[i
] = NULL
;
2840 mutex_unlock(&comedi_subdevice_minor_table_lock
);
2842 device_destroy(comedi_class
, MKDEV(COMEDI_MAJOR
, s
->minor
));
2843 s
->class_dev
= NULL
;
2847 static void comedi_cleanup_board_minors(void)
2849 struct comedi_device
*dev
;
2852 for (i
= 0; i
< COMEDI_NUM_BOARD_MINORS
; i
++) {
2853 dev
= comedi_clear_board_minor(i
);
2854 comedi_free_board_dev(dev
);
2858 static int __init
comedi_init(void)
2863 pr_info("version " COMEDI_RELEASE
" - http://www.comedi.org\n");
2865 if (comedi_num_legacy_minors
< 0 ||
2866 comedi_num_legacy_minors
> COMEDI_NUM_BOARD_MINORS
) {
2867 pr_err("invalid value for module parameter \"comedi_num_legacy_minors\". Valid values are 0 through %i.\n",
2868 COMEDI_NUM_BOARD_MINORS
);
2872 retval
= register_chrdev_region(MKDEV(COMEDI_MAJOR
, 0),
2873 COMEDI_NUM_MINORS
, "comedi");
2876 cdev_init(&comedi_cdev
, &comedi_fops
);
2877 comedi_cdev
.owner
= THIS_MODULE
;
2879 retval
= kobject_set_name(&comedi_cdev
.kobj
, "comedi");
2881 unregister_chrdev_region(MKDEV(COMEDI_MAJOR
, 0),
2886 if (cdev_add(&comedi_cdev
, MKDEV(COMEDI_MAJOR
, 0), COMEDI_NUM_MINORS
)) {
2887 unregister_chrdev_region(MKDEV(COMEDI_MAJOR
, 0),
2891 comedi_class
= class_create(THIS_MODULE
, "comedi");
2892 if (IS_ERR(comedi_class
)) {
2893 pr_err("failed to create class\n");
2894 cdev_del(&comedi_cdev
);
2895 unregister_chrdev_region(MKDEV(COMEDI_MAJOR
, 0),
2897 return PTR_ERR(comedi_class
);
2900 comedi_class
->dev_groups
= comedi_dev_groups
;
2902 /* XXX requires /proc interface */
2905 /* create devices files for legacy/manual use */
2906 for (i
= 0; i
< comedi_num_legacy_minors
; i
++) {
2907 struct comedi_device
*dev
;
2909 dev
= comedi_alloc_board_minor(NULL
);
2911 comedi_cleanup_board_minors();
2912 cdev_del(&comedi_cdev
);
2913 unregister_chrdev_region(MKDEV(COMEDI_MAJOR
, 0),
2915 return PTR_ERR(dev
);
2917 /* comedi_alloc_board_minor() locked the mutex */
2918 mutex_unlock(&dev
->mutex
);
2923 module_init(comedi_init
);
2925 static void __exit
comedi_cleanup(void)
2927 comedi_cleanup_board_minors();
2928 class_destroy(comedi_class
);
2929 cdev_del(&comedi_cdev
);
2930 unregister_chrdev_region(MKDEV(COMEDI_MAJOR
, 0), COMEDI_NUM_MINORS
);
2932 comedi_proc_cleanup();
2934 module_exit(comedi_cleanup
);
2936 MODULE_AUTHOR("http://www.comedi.org");
2937 MODULE_DESCRIPTION("Comedi core module");
2938 MODULE_LICENSE("GPL");