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.
18 You should have received a copy of the GNU General Public License
19 along with this program; if not, write to the Free Software
20 Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
26 #include "comedi_compat32.h"
28 #include <linux/module.h>
29 #include <linux/errno.h>
30 #include <linux/kernel.h>
31 #include <linux/sched.h>
32 #include <linux/fcntl.h>
33 #include <linux/delay.h>
34 #include <linux/ioport.h>
36 #include <linux/slab.h>
37 #include <linux/kmod.h>
38 #include <linux/poll.h>
39 #include <linux/init.h>
40 #include <linux/device.h>
41 #include <linux/vmalloc.h>
43 #include "comedidev.h"
44 #include <linux/cdev.h>
45 #include <linux/stat.h>
48 #include <linux/uaccess.h>
50 #include "comedi_internal.h"
52 MODULE_AUTHOR("http://www.comedi.org");
53 MODULE_DESCRIPTION("Comedi core module");
54 MODULE_LICENSE("GPL");
56 #ifdef CONFIG_COMEDI_DEBUG
58 EXPORT_SYMBOL(comedi_debug
);
59 module_param(comedi_debug
, int, S_IRUGO
| S_IWUSR
);
60 MODULE_PARM_DESC(comedi_debug
,
61 "enable comedi core and driver debugging if non-zero (default 0)"
65 bool comedi_autoconfig
= 1;
66 module_param(comedi_autoconfig
, bool, S_IRUGO
);
67 MODULE_PARM_DESC(comedi_autoconfig
,
68 "enable drivers to auto-configure comedi devices (default 1)");
70 static int comedi_num_legacy_minors
;
71 module_param(comedi_num_legacy_minors
, int, S_IRUGO
);
72 MODULE_PARM_DESC(comedi_num_legacy_minors
,
73 "number of comedi minor devices to reserve for non-auto-configured devices (default 0)"
76 unsigned int comedi_default_buf_size_kb
= CONFIG_COMEDI_DEFAULT_BUF_SIZE_KB
;
77 module_param(comedi_default_buf_size_kb
, uint
, S_IRUGO
| S_IWUSR
);
78 MODULE_PARM_DESC(comedi_default_buf_size_kb
,
79 "default asynchronous buffer size in KiB (default "
80 __MODULE_STRING(CONFIG_COMEDI_DEFAULT_BUF_SIZE_KB
) ")");
82 unsigned int comedi_default_buf_maxsize_kb
83 = CONFIG_COMEDI_DEFAULT_BUF_MAXSIZE_KB
;
84 module_param(comedi_default_buf_maxsize_kb
, uint
, S_IRUGO
| S_IWUSR
);
85 MODULE_PARM_DESC(comedi_default_buf_maxsize_kb
,
86 "default maximum size of asynchronous buffer in KiB (default "
87 __MODULE_STRING(CONFIG_COMEDI_DEFAULT_BUF_MAXSIZE_KB
) ")");
89 static DEFINE_SPINLOCK(comedi_file_info_table_lock
);
90 static struct comedi_device_file_info
91 *comedi_file_info_table
[COMEDI_NUM_MINORS
];
93 static void do_become_nonbusy(struct comedi_device
*dev
,
94 struct comedi_subdevice
*s
);
95 static int do_cancel(struct comedi_device
*dev
, struct comedi_subdevice
*s
);
97 static int comedi_fasync(int fd
, struct file
*file
, int on
);
99 static int is_device_busy(struct comedi_device
*dev
);
101 static int resize_async_buffer(struct comedi_device
*dev
,
102 struct comedi_subdevice
*s
,
103 struct comedi_async
*async
, unsigned new_size
)
107 if (new_size
> async
->max_bufsize
)
111 DPRINTK("subdevice is busy, cannot resize buffer\n");
114 if (async
->mmap_count
) {
115 DPRINTK("subdevice is mmapped, cannot resize buffer\n");
119 if (!async
->prealloc_buf
)
122 /* make sure buffer is an integral number of pages
124 new_size
= (new_size
+ PAGE_SIZE
- 1) & PAGE_MASK
;
126 retval
= comedi_buf_alloc(dev
, s
, new_size
);
131 retval
= s
->buf_change(dev
, s
, new_size
);
136 DPRINTK("comedi%i subd %d buffer resized to %i bytes\n",
137 dev
->minor
, (int)(s
- dev
->subdevices
), async
->prealloc_bufsz
);
141 /* sysfs attribute files */
143 static ssize_t
show_max_read_buffer_kb(struct device
*dev
,
144 struct device_attribute
*attr
, char *buf
)
146 struct comedi_device_file_info
*info
= dev_get_drvdata(dev
);
147 struct comedi_subdevice
*s
= comedi_get_read_subdevice(info
);
148 unsigned int size
= 0;
150 mutex_lock(&info
->device
->mutex
);
151 if (s
&& (s
->subdev_flags
& SDF_CMD_READ
) && s
->async
)
152 size
= s
->async
->max_bufsize
/ 1024;
153 mutex_unlock(&info
->device
->mutex
);
155 return snprintf(buf
, PAGE_SIZE
, "%i\n", size
);
158 static ssize_t
store_max_read_buffer_kb(struct device
*dev
,
159 struct device_attribute
*attr
,
160 const char *buf
, size_t count
)
162 struct comedi_device_file_info
*info
= dev_get_drvdata(dev
);
163 struct comedi_subdevice
*s
= comedi_get_read_subdevice(info
);
167 err
= kstrtouint(buf
, 10, &size
);
170 if (size
> (UINT_MAX
/ 1024))
174 mutex_lock(&info
->device
->mutex
);
175 if (s
&& (s
->subdev_flags
& SDF_CMD_READ
) && s
->async
)
176 s
->async
->max_bufsize
= size
;
179 mutex_unlock(&info
->device
->mutex
);
181 return err
? err
: count
;
184 static ssize_t
show_read_buffer_kb(struct device
*dev
,
185 struct device_attribute
*attr
, char *buf
)
187 struct comedi_device_file_info
*info
= dev_get_drvdata(dev
);
188 struct comedi_subdevice
*s
= comedi_get_read_subdevice(info
);
189 unsigned int size
= 0;
191 mutex_lock(&info
->device
->mutex
);
192 if (s
&& (s
->subdev_flags
& SDF_CMD_READ
) && s
->async
)
193 size
= s
->async
->prealloc_bufsz
/ 1024;
194 mutex_unlock(&info
->device
->mutex
);
196 return snprintf(buf
, PAGE_SIZE
, "%i\n", size
);
199 static ssize_t
store_read_buffer_kb(struct device
*dev
,
200 struct device_attribute
*attr
,
201 const char *buf
, size_t count
)
203 struct comedi_device_file_info
*info
= dev_get_drvdata(dev
);
204 struct comedi_subdevice
*s
= comedi_get_read_subdevice(info
);
208 err
= kstrtouint(buf
, 10, &size
);
211 if (size
> (UINT_MAX
/ 1024))
215 mutex_lock(&info
->device
->mutex
);
216 if (s
&& (s
->subdev_flags
& SDF_CMD_READ
) && s
->async
)
217 err
= resize_async_buffer(info
->device
, s
, s
->async
, size
);
220 mutex_unlock(&info
->device
->mutex
);
222 return err
? err
: count
;
225 static ssize_t
show_max_write_buffer_kb(struct device
*dev
,
226 struct device_attribute
*attr
,
229 struct comedi_device_file_info
*info
= dev_get_drvdata(dev
);
230 struct comedi_subdevice
*s
= comedi_get_write_subdevice(info
);
231 unsigned int size
= 0;
233 mutex_lock(&info
->device
->mutex
);
234 if (s
&& (s
->subdev_flags
& SDF_CMD_WRITE
) && s
->async
)
235 size
= s
->async
->max_bufsize
/ 1024;
236 mutex_unlock(&info
->device
->mutex
);
238 return snprintf(buf
, PAGE_SIZE
, "%i\n", size
);
241 static ssize_t
store_max_write_buffer_kb(struct device
*dev
,
242 struct device_attribute
*attr
,
243 const char *buf
, size_t count
)
245 struct comedi_device_file_info
*info
= dev_get_drvdata(dev
);
246 struct comedi_subdevice
*s
= comedi_get_write_subdevice(info
);
250 err
= kstrtouint(buf
, 10, &size
);
253 if (size
> (UINT_MAX
/ 1024))
257 mutex_lock(&info
->device
->mutex
);
258 if (s
&& (s
->subdev_flags
& SDF_CMD_WRITE
) && s
->async
)
259 s
->async
->max_bufsize
= size
;
262 mutex_unlock(&info
->device
->mutex
);
264 return err
? err
: count
;
267 static ssize_t
show_write_buffer_kb(struct device
*dev
,
268 struct device_attribute
*attr
, char *buf
)
270 struct comedi_device_file_info
*info
= dev_get_drvdata(dev
);
271 struct comedi_subdevice
*s
= comedi_get_write_subdevice(info
);
272 unsigned int size
= 0;
274 mutex_lock(&info
->device
->mutex
);
275 if (s
&& (s
->subdev_flags
& SDF_CMD_WRITE
) && s
->async
)
276 size
= s
->async
->prealloc_bufsz
/ 1024;
277 mutex_unlock(&info
->device
->mutex
);
279 return snprintf(buf
, PAGE_SIZE
, "%i\n", size
);
282 static ssize_t
store_write_buffer_kb(struct device
*dev
,
283 struct device_attribute
*attr
,
284 const char *buf
, size_t count
)
286 struct comedi_device_file_info
*info
= dev_get_drvdata(dev
);
287 struct comedi_subdevice
*s
= comedi_get_write_subdevice(info
);
291 err
= kstrtouint(buf
, 10, &size
);
294 if (size
> (UINT_MAX
/ 1024))
298 mutex_lock(&info
->device
->mutex
);
299 if (s
&& (s
->subdev_flags
& SDF_CMD_WRITE
) && s
->async
)
300 err
= resize_async_buffer(info
->device
, s
, s
->async
, size
);
303 mutex_unlock(&info
->device
->mutex
);
305 return err
? err
: count
;
308 static struct device_attribute comedi_dev_attrs
[] = {
309 __ATTR(max_read_buffer_kb
, S_IRUGO
| S_IWUSR
,
310 show_max_read_buffer_kb
, store_max_read_buffer_kb
),
311 __ATTR(read_buffer_kb
, S_IRUGO
| S_IWUSR
| S_IWGRP
,
312 show_read_buffer_kb
, store_read_buffer_kb
),
313 __ATTR(max_write_buffer_kb
, S_IRUGO
| S_IWUSR
,
314 show_max_write_buffer_kb
, store_max_write_buffer_kb
),
315 __ATTR(write_buffer_kb
, S_IRUGO
| S_IWUSR
| S_IWGRP
,
316 show_write_buffer_kb
, store_write_buffer_kb
),
325 pointer to devconfig structure
328 devconfig structure at arg
333 static int do_devconfig_ioctl(struct comedi_device
*dev
,
334 struct comedi_devconfig __user
*arg
)
336 struct comedi_devconfig it
;
338 unsigned char *aux_data
= NULL
;
341 if (!capable(CAP_SYS_ADMIN
))
345 if (is_device_busy(dev
))
348 struct module
*driver_module
= dev
->driver
->module
;
349 comedi_device_detach(dev
);
350 module_put(driver_module
);
355 if (copy_from_user(&it
, arg
, sizeof(struct comedi_devconfig
)))
358 it
.board_name
[COMEDI_NAMELEN
- 1] = 0;
360 if (comedi_aux_data(it
.options
, 0) &&
361 it
.options
[COMEDI_DEVCONF_AUX_DATA_LENGTH
]) {
363 aux_len
= it
.options
[COMEDI_DEVCONF_AUX_DATA_LENGTH
];
367 aux_data
= vmalloc(aux_len
);
371 if (copy_from_user(aux_data
,
372 (unsigned char __user
*
373 )comedi_aux_data(it
.options
, 0), aux_len
)) {
377 it
.options
[COMEDI_DEVCONF_AUX_DATA_LO
] =
378 (unsigned long)aux_data
;
379 if (sizeof(void *) > sizeof(int)) {
380 bit_shift
= sizeof(int) * 8;
381 it
.options
[COMEDI_DEVCONF_AUX_DATA_HI
] =
382 ((unsigned long)aux_data
) >> bit_shift
;
384 it
.options
[COMEDI_DEVCONF_AUX_DATA_HI
] = 0;
387 ret
= comedi_device_attach(dev
, &it
);
389 if (!try_module_get(dev
->driver
->module
)) {
390 comedi_device_detach(dev
);
403 buffer configuration ioctl
406 pointer to bufconfig structure
412 modified bufconfig at arg
415 static int do_bufconfig_ioctl(struct comedi_device
*dev
,
416 struct comedi_bufconfig __user
*arg
)
418 struct comedi_bufconfig bc
;
419 struct comedi_async
*async
;
420 struct comedi_subdevice
*s
;
423 if (copy_from_user(&bc
, arg
, sizeof(struct comedi_bufconfig
)))
426 if (bc
.subdevice
>= dev
->n_subdevices
|| bc
.subdevice
< 0)
429 s
= &dev
->subdevices
[bc
.subdevice
];
433 DPRINTK("subdevice does not have async capability\n");
439 if (bc
.maximum_size
) {
440 if (!capable(CAP_SYS_ADMIN
))
443 async
->max_bufsize
= bc
.maximum_size
;
447 retval
= resize_async_buffer(dev
, s
, async
, bc
.size
);
452 bc
.size
= async
->prealloc_bufsz
;
453 bc
.maximum_size
= async
->max_bufsize
;
456 if (copy_to_user(arg
, &bc
, sizeof(struct comedi_bufconfig
)))
467 pointer to devinfo structure
476 static int do_devinfo_ioctl(struct comedi_device
*dev
,
477 struct comedi_devinfo __user
*arg
,
480 struct comedi_devinfo devinfo
;
481 const unsigned minor
= iminor(file
->f_dentry
->d_inode
);
482 struct comedi_device_file_info
*dev_file_info
=
483 comedi_get_device_file_info(minor
);
484 struct comedi_subdevice
*read_subdev
=
485 comedi_get_read_subdevice(dev_file_info
);
486 struct comedi_subdevice
*write_subdev
=
487 comedi_get_write_subdevice(dev_file_info
);
489 memset(&devinfo
, 0, sizeof(devinfo
));
491 /* fill devinfo structure */
492 devinfo
.version_code
= COMEDI_VERSION_CODE
;
493 devinfo
.n_subdevs
= dev
->n_subdevices
;
494 strlcpy(devinfo
.driver_name
, dev
->driver
->driver_name
, COMEDI_NAMELEN
);
495 strlcpy(devinfo
.board_name
, dev
->board_name
, COMEDI_NAMELEN
);
498 devinfo
.read_subdevice
= read_subdev
- dev
->subdevices
;
500 devinfo
.read_subdevice
= -1;
503 devinfo
.write_subdevice
= write_subdev
- dev
->subdevices
;
505 devinfo
.write_subdevice
= -1;
507 if (copy_to_user(arg
, &devinfo
, sizeof(struct comedi_devinfo
)))
518 pointer to array of subdevice info structures
524 array of subdevice info structures at arg
527 static int do_subdinfo_ioctl(struct comedi_device
*dev
,
528 struct comedi_subdinfo __user
*arg
, void *file
)
531 struct comedi_subdinfo
*tmp
, *us
;
532 struct comedi_subdevice
*s
;
535 kcalloc(dev
->n_subdevices
, sizeof(struct comedi_subdinfo
),
540 /* fill subdinfo structs */
541 for (i
= 0; i
< dev
->n_subdevices
; i
++) {
542 s
= &dev
->subdevices
[i
];
546 us
->n_chan
= s
->n_chan
;
547 us
->subd_flags
= s
->subdev_flags
;
548 if (comedi_get_subdevice_runflags(s
) & SRF_RUNNING
)
549 us
->subd_flags
|= SDF_RUNNING
;
550 #define TIMER_nanosec 5 /* backwards compatibility */
551 us
->timer_type
= TIMER_nanosec
;
552 us
->len_chanlist
= s
->len_chanlist
;
553 us
->maxdata
= s
->maxdata
;
554 if (s
->range_table
) {
556 (i
<< 24) | (0 << 16) | (s
->range_table
->length
);
558 us
->range_type
= 0; /* XXX */
560 us
->flags
= s
->flags
;
563 us
->subd_flags
|= SDF_BUSY
;
565 us
->subd_flags
|= SDF_BUSY_OWNER
;
567 us
->subd_flags
|= SDF_LOCKED
;
569 us
->subd_flags
|= SDF_LOCK_OWNER
;
570 if (!s
->maxdata
&& s
->maxdata_list
)
571 us
->subd_flags
|= SDF_MAXDATA
;
573 us
->subd_flags
|= SDF_FLAGS
;
574 if (s
->range_table_list
)
575 us
->subd_flags
|= SDF_RANGETYPE
;
577 us
->subd_flags
|= SDF_CMD
;
579 if (s
->insn_bits
!= &insn_inval
)
580 us
->insn_bits_support
= COMEDI_SUPPORTED
;
582 us
->insn_bits_support
= COMEDI_UNSUPPORTED
;
584 us
->settling_time_0
= s
->settling_time_0
;
587 ret
= copy_to_user(arg
, tmp
,
588 dev
->n_subdevices
* sizeof(struct comedi_subdinfo
));
592 return ret
? -EFAULT
: 0;
600 pointer to chaninfo structure
603 chaninfo structure at arg
606 arrays at elements of chaninfo structure
609 static int do_chaninfo_ioctl(struct comedi_device
*dev
,
610 struct comedi_chaninfo __user
*arg
)
612 struct comedi_subdevice
*s
;
613 struct comedi_chaninfo it
;
615 if (copy_from_user(&it
, arg
, sizeof(struct comedi_chaninfo
)))
618 if (it
.subdev
>= dev
->n_subdevices
)
620 s
= &dev
->subdevices
[it
.subdev
];
622 if (it
.maxdata_list
) {
623 if (s
->maxdata
|| !s
->maxdata_list
)
625 if (copy_to_user(it
.maxdata_list
, s
->maxdata_list
,
626 s
->n_chan
* sizeof(unsigned int)))
633 if (copy_to_user(it
.flaglist
, s
->flaglist
,
634 s
->n_chan
* sizeof(unsigned int)))
641 if (!s
->range_table_list
)
643 for (i
= 0; i
< s
->n_chan
; i
++) {
646 x
= (dev
->minor
<< 28) | (it
.subdev
<< 24) | (i
<< 16) |
647 (s
->range_table_list
[i
]->length
);
648 if (put_user(x
, it
.rangelist
+ i
))
652 if (copy_to_user(it
.rangelist
, s
->range_type_list
,
653 s
->n_chan
* sizeof(unsigned int)))
663 buffer information ioctl
666 pointer to bufinfo structure
672 modified bufinfo at arg
675 static int do_bufinfo_ioctl(struct comedi_device
*dev
,
676 struct comedi_bufinfo __user
*arg
, void *file
)
678 struct comedi_bufinfo bi
;
679 struct comedi_subdevice
*s
;
680 struct comedi_async
*async
;
682 if (copy_from_user(&bi
, arg
, sizeof(struct comedi_bufinfo
)))
685 if (bi
.subdevice
>= dev
->n_subdevices
|| bi
.subdevice
< 0)
688 s
= &dev
->subdevices
[bi
.subdevice
];
690 if (s
->lock
&& s
->lock
!= file
)
696 DPRINTK("subdevice does not have async capability\n");
697 bi
.buf_write_ptr
= 0;
699 bi
.buf_write_count
= 0;
700 bi
.buf_read_count
= 0;
702 bi
.bytes_written
= 0;
707 bi
.bytes_written
= 0;
708 goto copyback_position
;
713 if (bi
.bytes_read
&& (s
->subdev_flags
& SDF_CMD_READ
)) {
714 bi
.bytes_read
= comedi_buf_read_alloc(async
, bi
.bytes_read
);
715 comedi_buf_read_free(async
, bi
.bytes_read
);
717 if (!(comedi_get_subdevice_runflags(s
) & (SRF_ERROR
|
719 && async
->buf_write_count
== async
->buf_read_count
) {
720 do_become_nonbusy(dev
, s
);
724 if (bi
.bytes_written
&& (s
->subdev_flags
& SDF_CMD_WRITE
)) {
726 comedi_buf_write_alloc(async
, bi
.bytes_written
);
727 comedi_buf_write_free(async
, bi
.bytes_written
);
731 bi
.buf_write_count
= async
->buf_write_count
;
732 bi
.buf_write_ptr
= async
->buf_write_ptr
;
733 bi
.buf_read_count
= async
->buf_read_count
;
734 bi
.buf_read_ptr
= async
->buf_read_ptr
;
737 if (copy_to_user(arg
, &bi
, sizeof(struct comedi_bufinfo
)))
743 static int parse_insn(struct comedi_device
*dev
, struct comedi_insn
*insn
,
744 unsigned int *data
, void *file
);
747 * synchronous instructions
750 * pointer to sync cmd structure
753 * sync cmd struct at arg
760 /* arbitrary limits */
761 #define MAX_SAMPLES 256
762 static int do_insnlist_ioctl(struct comedi_device
*dev
,
763 struct comedi_insnlist __user
*arg
, void *file
)
765 struct comedi_insnlist insnlist
;
766 struct comedi_insn
*insns
= NULL
;
767 unsigned int *data
= NULL
;
771 if (copy_from_user(&insnlist
, arg
, sizeof(struct comedi_insnlist
)))
774 data
= kmalloc(sizeof(unsigned int) * MAX_SAMPLES
, GFP_KERNEL
);
776 DPRINTK("kmalloc failed\n");
782 kcalloc(insnlist
.n_insns
, sizeof(struct comedi_insn
), GFP_KERNEL
);
784 DPRINTK("kmalloc failed\n");
789 if (copy_from_user(insns
, insnlist
.insns
,
790 sizeof(struct comedi_insn
) * insnlist
.n_insns
)) {
791 DPRINTK("copy_from_user failed\n");
796 for (i
= 0; i
< insnlist
.n_insns
; i
++) {
797 if (insns
[i
].n
> MAX_SAMPLES
) {
798 DPRINTK("number of samples too large\n");
802 if (insns
[i
].insn
& INSN_MASK_WRITE
) {
803 if (copy_from_user(data
, insns
[i
].data
,
804 insns
[i
].n
* sizeof(unsigned int))) {
805 DPRINTK("copy_from_user failed\n");
810 ret
= parse_insn(dev
, insns
+ i
, data
, file
);
813 if (insns
[i
].insn
& INSN_MASK_READ
) {
814 if (copy_to_user(insns
[i
].data
, data
,
815 insns
[i
].n
* sizeof(unsigned int))) {
816 DPRINTK("copy_to_user failed\n");
834 static int check_insn_config_length(struct comedi_insn
*insn
,
841 case INSN_CONFIG_DIO_OUTPUT
:
842 case INSN_CONFIG_DIO_INPUT
:
843 case INSN_CONFIG_DISARM
:
844 case INSN_CONFIG_RESET
:
848 case INSN_CONFIG_ARM
:
849 case INSN_CONFIG_DIO_QUERY
:
850 case INSN_CONFIG_BLOCK_SIZE
:
851 case INSN_CONFIG_FILTER
:
852 case INSN_CONFIG_SERIAL_CLOCK
:
853 case INSN_CONFIG_BIDIRECTIONAL_DATA
:
854 case INSN_CONFIG_ALT_SOURCE
:
855 case INSN_CONFIG_SET_COUNTER_MODE
:
856 case INSN_CONFIG_8254_READ_STATUS
:
857 case INSN_CONFIG_SET_ROUTING
:
858 case INSN_CONFIG_GET_ROUTING
:
859 case INSN_CONFIG_GET_PWM_STATUS
:
860 case INSN_CONFIG_PWM_SET_PERIOD
:
861 case INSN_CONFIG_PWM_GET_PERIOD
:
865 case INSN_CONFIG_SET_GATE_SRC
:
866 case INSN_CONFIG_GET_GATE_SRC
:
867 case INSN_CONFIG_SET_CLOCK_SRC
:
868 case INSN_CONFIG_GET_CLOCK_SRC
:
869 case INSN_CONFIG_SET_OTHER_SRC
:
870 case INSN_CONFIG_GET_COUNTER_STATUS
:
871 case INSN_CONFIG_PWM_SET_H_BRIDGE
:
872 case INSN_CONFIG_PWM_GET_H_BRIDGE
:
873 case INSN_CONFIG_GET_HARDWARE_BUFFER_SIZE
:
877 case INSN_CONFIG_PWM_OUTPUT
:
878 case INSN_CONFIG_ANALOG_TRIG
:
882 case INSN_CONFIG_DIGITAL_TRIG
:
886 /* by default we allow the insn since we don't have checks for
887 * all possible cases yet */
889 pr_warn("comedi: No check for data length of config insn id %i is implemented.\n",
891 pr_warn("comedi: Add a check to %s in %s.\n",
893 pr_warn("comedi: Assuming n=%i is correct.\n", insn
->n
);
899 static int parse_insn(struct comedi_device
*dev
, struct comedi_insn
*insn
,
900 unsigned int *data
, void *file
)
902 struct comedi_subdevice
*s
;
906 if (insn
->insn
& INSN_MASK_SPECIAL
) {
907 /* a non-subdevice instruction */
909 switch (insn
->insn
) {
919 do_gettimeofday(&tv
);
921 data
[1] = tv
.tv_usec
;
927 if (insn
->n
!= 1 || data
[0] >= 100000) {
931 udelay(data
[0] / 1000);
939 if (insn
->subdev
>= dev
->n_subdevices
) {
940 DPRINTK("%d not usable subdevice\n",
945 s
= &dev
->subdevices
[insn
->subdev
];
947 DPRINTK("no async\n");
951 if (!s
->async
->inttrig
) {
952 DPRINTK("no inttrig\n");
956 ret
= s
->async
->inttrig(dev
, s
, data
[0]);
961 DPRINTK("invalid insn\n");
966 /* a subdevice instruction */
967 unsigned int maxdata
;
969 if (insn
->subdev
>= dev
->n_subdevices
) {
970 DPRINTK("subdevice %d out of range\n", insn
->subdev
);
974 s
= &dev
->subdevices
[insn
->subdev
];
976 if (s
->type
== COMEDI_SUBD_UNUSED
) {
977 DPRINTK("%d not usable subdevice\n", insn
->subdev
);
982 /* are we locked? (ioctl lock) */
983 if (s
->lock
&& s
->lock
!= file
) {
984 DPRINTK("device locked\n");
989 ret
= comedi_check_chanlist(s
, 1, &insn
->chanspec
);
992 DPRINTK("bad chanspec\n");
1000 /* This looks arbitrary. It is. */
1001 s
->busy
= &parse_insn
;
1002 switch (insn
->insn
) {
1004 ret
= s
->insn_read(dev
, s
, insn
, data
);
1007 maxdata
= s
->maxdata_list
1008 ? s
->maxdata_list
[CR_CHAN(insn
->chanspec
)]
1010 for (i
= 0; i
< insn
->n
; ++i
) {
1011 if (data
[i
] > maxdata
) {
1013 DPRINTK("bad data value(s)\n");
1018 ret
= s
->insn_write(dev
, s
, insn
, data
);
1024 /* Most drivers ignore the base channel in
1025 * insn->chanspec. Fix this here if
1026 * the subdevice has <= 32 channels. */
1028 unsigned int orig_mask
;
1030 orig_mask
= data
[0];
1031 if (s
->n_chan
<= 32) {
1032 shift
= CR_CHAN(insn
->chanspec
);
1040 ret
= s
->insn_bits(dev
, s
, insn
, data
);
1041 data
[0] = orig_mask
;
1047 ret
= check_insn_config_length(insn
, data
);
1050 ret
= s
->insn_config(dev
, s
, insn
, data
);
1066 * synchronous instructions
1072 * struct comedi_insn struct at arg
1078 static int do_insn_ioctl(struct comedi_device
*dev
,
1079 struct comedi_insn __user
*arg
, void *file
)
1081 struct comedi_insn insn
;
1082 unsigned int *data
= NULL
;
1085 data
= kmalloc(sizeof(unsigned int) * MAX_SAMPLES
, GFP_KERNEL
);
1091 if (copy_from_user(&insn
, arg
, sizeof(struct comedi_insn
))) {
1096 /* This is where the behavior of insn and insnlist deviate. */
1097 if (insn
.n
> MAX_SAMPLES
)
1098 insn
.n
= MAX_SAMPLES
;
1099 if (insn
.insn
& INSN_MASK_WRITE
) {
1100 if (copy_from_user(data
,
1102 insn
.n
* sizeof(unsigned int))) {
1107 ret
= parse_insn(dev
, &insn
, data
, file
);
1110 if (insn
.insn
& INSN_MASK_READ
) {
1111 if (copy_to_user(insn
.data
,
1113 insn
.n
* sizeof(unsigned int))) {
1126 static void comedi_set_subdevice_runflags(struct comedi_subdevice
*s
,
1127 unsigned mask
, unsigned bits
)
1129 unsigned long flags
;
1131 spin_lock_irqsave(&s
->spin_lock
, flags
);
1132 s
->runflags
&= ~mask
;
1133 s
->runflags
|= (bits
& mask
);
1134 spin_unlock_irqrestore(&s
->spin_lock
, flags
);
1137 static int do_cmd_ioctl(struct comedi_device
*dev
,
1138 struct comedi_cmd __user
*arg
, void *file
)
1140 struct comedi_cmd cmd
;
1141 struct comedi_subdevice
*s
;
1142 struct comedi_async
*async
;
1144 unsigned int __user
*user_chanlist
;
1146 if (copy_from_user(&cmd
, arg
, sizeof(struct comedi_cmd
))) {
1147 DPRINTK("bad cmd address\n");
1150 /* save user's chanlist pointer so it can be restored later */
1151 user_chanlist
= (unsigned int __user
*)cmd
.chanlist
;
1153 if (cmd
.subdev
>= dev
->n_subdevices
) {
1154 DPRINTK("%d no such subdevice\n", cmd
.subdev
);
1158 s
= &dev
->subdevices
[cmd
.subdev
];
1161 if (s
->type
== COMEDI_SUBD_UNUSED
) {
1162 DPRINTK("%d not valid subdevice\n", cmd
.subdev
);
1166 if (!s
->do_cmd
|| !s
->do_cmdtest
|| !s
->async
) {
1167 DPRINTK("subdevice %i does not support commands\n",
1172 /* are we locked? (ioctl lock) */
1173 if (s
->lock
&& s
->lock
!= file
) {
1174 DPRINTK("subdevice locked\n");
1180 DPRINTK("subdevice busy\n");
1185 /* make sure channel/gain list isn't too long */
1186 if (cmd
.chanlist_len
> s
->len_chanlist
) {
1187 DPRINTK("channel/gain list too long %u > %d\n",
1188 cmd
.chanlist_len
, s
->len_chanlist
);
1193 /* make sure channel/gain list isn't too short */
1194 if (cmd
.chanlist_len
< 1) {
1195 DPRINTK("channel/gain list too short %u < 1\n",
1202 async
->cmd
.data
= NULL
;
1203 /* load channel/gain list */
1204 async
->cmd
.chanlist
=
1205 kmalloc(async
->cmd
.chanlist_len
* sizeof(int), GFP_KERNEL
);
1206 if (!async
->cmd
.chanlist
) {
1207 DPRINTK("allocation failed\n");
1212 if (copy_from_user(async
->cmd
.chanlist
, user_chanlist
,
1213 async
->cmd
.chanlist_len
* sizeof(int))) {
1214 DPRINTK("fault reading chanlist\n");
1219 /* make sure each element in channel/gain list is valid */
1220 ret
= comedi_check_chanlist(s
,
1221 async
->cmd
.chanlist_len
,
1222 async
->cmd
.chanlist
);
1224 DPRINTK("bad chanlist\n");
1228 ret
= s
->do_cmdtest(dev
, s
, &async
->cmd
);
1230 if (async
->cmd
.flags
& TRIG_BOGUS
|| ret
) {
1231 DPRINTK("test returned %d\n", ret
);
1233 /* restore chanlist pointer before copying back */
1234 cmd
.chanlist
= (unsigned int __force
*)user_chanlist
;
1236 if (copy_to_user(arg
, &cmd
, sizeof(struct comedi_cmd
))) {
1237 DPRINTK("fault writing cmd\n");
1245 if (!async
->prealloc_bufsz
) {
1247 DPRINTK("no buffer (?)\n");
1251 comedi_reset_async_buf(async
);
1254 COMEDI_CB_EOA
| COMEDI_CB_BLOCK
| COMEDI_CB_ERROR
|
1256 if (async
->cmd
.flags
& TRIG_WAKE_EOS
)
1257 async
->cb_mask
|= COMEDI_CB_EOS
;
1259 comedi_set_subdevice_runflags(s
, ~0, SRF_USER
| SRF_RUNNING
);
1261 ret
= s
->do_cmd(dev
, s
);
1266 do_become_nonbusy(dev
, s
);
1273 command testing ioctl
1276 pointer to cmd structure
1279 cmd structure at arg
1283 modified cmd structure at arg
1286 static int do_cmdtest_ioctl(struct comedi_device
*dev
,
1287 struct comedi_cmd __user
*arg
, void *file
)
1289 struct comedi_cmd cmd
;
1290 struct comedi_subdevice
*s
;
1292 unsigned int *chanlist
= NULL
;
1293 unsigned int __user
*user_chanlist
;
1295 if (copy_from_user(&cmd
, arg
, sizeof(struct comedi_cmd
))) {
1296 DPRINTK("bad cmd address\n");
1299 /* save user's chanlist pointer so it can be restored later */
1300 user_chanlist
= (unsigned int __user
*)cmd
.chanlist
;
1302 if (cmd
.subdev
>= dev
->n_subdevices
) {
1303 DPRINTK("%d no such subdevice\n", cmd
.subdev
);
1307 s
= &dev
->subdevices
[cmd
.subdev
];
1308 if (s
->type
== COMEDI_SUBD_UNUSED
) {
1309 DPRINTK("%d not valid subdevice\n", cmd
.subdev
);
1313 if (!s
->do_cmd
|| !s
->do_cmdtest
) {
1314 DPRINTK("subdevice %i does not support commands\n",
1319 /* make sure channel/gain list isn't too long */
1320 if (cmd
.chanlist_len
> s
->len_chanlist
) {
1321 DPRINTK("channel/gain list too long %d > %d\n",
1322 cmd
.chanlist_len
, s
->len_chanlist
);
1327 /* load channel/gain list */
1330 kmalloc(cmd
.chanlist_len
* sizeof(int), GFP_KERNEL
);
1332 DPRINTK("allocation failed\n");
1337 if (copy_from_user(chanlist
, user_chanlist
,
1338 cmd
.chanlist_len
* sizeof(int))) {
1339 DPRINTK("fault reading chanlist\n");
1344 /* make sure each element in channel/gain list is valid */
1345 ret
= comedi_check_chanlist(s
, cmd
.chanlist_len
, chanlist
);
1347 DPRINTK("bad chanlist\n");
1351 cmd
.chanlist
= chanlist
;
1354 ret
= s
->do_cmdtest(dev
, s
, &cmd
);
1356 /* restore chanlist pointer before copying back */
1357 cmd
.chanlist
= (unsigned int __force
*)user_chanlist
;
1359 if (copy_to_user(arg
, &cmd
, sizeof(struct comedi_cmd
))) {
1360 DPRINTK("bad cmd address\n");
1385 static int do_lock_ioctl(struct comedi_device
*dev
, unsigned int arg
,
1389 unsigned long flags
;
1390 struct comedi_subdevice
*s
;
1392 if (arg
>= dev
->n_subdevices
)
1394 s
= &dev
->subdevices
[arg
];
1396 spin_lock_irqsave(&s
->spin_lock
, flags
);
1397 if (s
->busy
|| s
->lock
)
1401 spin_unlock_irqrestore(&s
->spin_lock
, flags
);
1408 ret
= s
->lock_f(dev
, s
);
1427 This function isn't protected by the semaphore, since
1428 we already own the lock.
1430 static int do_unlock_ioctl(struct comedi_device
*dev
, unsigned int arg
,
1433 struct comedi_subdevice
*s
;
1435 if (arg
>= dev
->n_subdevices
)
1437 s
= &dev
->subdevices
[arg
];
1442 if (s
->lock
&& s
->lock
!= file
)
1445 if (s
->lock
== file
) {
1459 cancel acquisition ioctl
1471 static int do_cancel_ioctl(struct comedi_device
*dev
, unsigned int arg
,
1474 struct comedi_subdevice
*s
;
1476 if (arg
>= dev
->n_subdevices
)
1478 s
= &dev
->subdevices
[arg
];
1479 if (s
->async
== NULL
)
1482 if (s
->lock
&& s
->lock
!= file
)
1488 if (s
->busy
!= file
)
1491 return do_cancel(dev
, s
);
1496 instructs driver to synchronize buffers
1508 static int do_poll_ioctl(struct comedi_device
*dev
, unsigned int arg
,
1511 struct comedi_subdevice
*s
;
1513 if (arg
>= dev
->n_subdevices
)
1515 s
= &dev
->subdevices
[arg
];
1517 if (s
->lock
&& s
->lock
!= file
)
1523 if (s
->busy
!= file
)
1527 return s
->poll(dev
, s
);
1532 static long comedi_unlocked_ioctl(struct file
*file
, unsigned int cmd
,
1535 const unsigned minor
= iminor(file
->f_dentry
->d_inode
);
1536 struct comedi_device_file_info
*dev_file_info
=
1537 comedi_get_device_file_info(minor
);
1538 struct comedi_device
*dev
;
1541 if (dev_file_info
== NULL
|| dev_file_info
->device
== NULL
)
1543 dev
= dev_file_info
->device
;
1545 mutex_lock(&dev
->mutex
);
1547 /* Device config is special, because it must work on
1548 * an unconfigured device. */
1549 if (cmd
== COMEDI_DEVCONFIG
) {
1550 rc
= do_devconfig_ioctl(dev
,
1551 (struct comedi_devconfig __user
*)arg
);
1553 /* Evade comedi_auto_unconfig(). */
1554 dev_file_info
->hardware_device
= NULL
;
1558 if (!dev
->attached
) {
1559 DPRINTK("no driver configured on /dev/comedi%i\n", dev
->minor
);
1565 case COMEDI_BUFCONFIG
:
1566 rc
= do_bufconfig_ioctl(dev
,
1567 (struct comedi_bufconfig __user
*)arg
);
1569 case COMEDI_DEVINFO
:
1570 rc
= do_devinfo_ioctl(dev
, (struct comedi_devinfo __user
*)arg
,
1573 case COMEDI_SUBDINFO
:
1574 rc
= do_subdinfo_ioctl(dev
,
1575 (struct comedi_subdinfo __user
*)arg
,
1578 case COMEDI_CHANINFO
:
1579 rc
= do_chaninfo_ioctl(dev
, (void __user
*)arg
);
1581 case COMEDI_RANGEINFO
:
1582 rc
= do_rangeinfo_ioctl(dev
, (void __user
*)arg
);
1584 case COMEDI_BUFINFO
:
1585 rc
= do_bufinfo_ioctl(dev
,
1586 (struct comedi_bufinfo __user
*)arg
,
1590 rc
= do_lock_ioctl(dev
, arg
, file
);
1593 rc
= do_unlock_ioctl(dev
, arg
, file
);
1596 rc
= do_cancel_ioctl(dev
, arg
, file
);
1599 rc
= do_cmd_ioctl(dev
, (struct comedi_cmd __user
*)arg
, file
);
1601 case COMEDI_CMDTEST
:
1602 rc
= do_cmdtest_ioctl(dev
, (struct comedi_cmd __user
*)arg
,
1605 case COMEDI_INSNLIST
:
1606 rc
= do_insnlist_ioctl(dev
,
1607 (struct comedi_insnlist __user
*)arg
,
1611 rc
= do_insn_ioctl(dev
, (struct comedi_insn __user
*)arg
,
1615 rc
= do_poll_ioctl(dev
, arg
, file
);
1623 mutex_unlock(&dev
->mutex
);
1627 static int do_cancel(struct comedi_device
*dev
, struct comedi_subdevice
*s
)
1631 if ((comedi_get_subdevice_runflags(s
) & SRF_RUNNING
) && s
->cancel
)
1632 ret
= s
->cancel(dev
, s
);
1634 do_become_nonbusy(dev
, s
);
1640 static void comedi_vm_open(struct vm_area_struct
*area
)
1642 struct comedi_async
*async
;
1643 struct comedi_device
*dev
;
1645 async
= area
->vm_private_data
;
1646 dev
= async
->subdevice
->device
;
1648 mutex_lock(&dev
->mutex
);
1649 async
->mmap_count
++;
1650 mutex_unlock(&dev
->mutex
);
1653 static void comedi_vm_close(struct vm_area_struct
*area
)
1655 struct comedi_async
*async
;
1656 struct comedi_device
*dev
;
1658 async
= area
->vm_private_data
;
1659 dev
= async
->subdevice
->device
;
1661 mutex_lock(&dev
->mutex
);
1662 async
->mmap_count
--;
1663 mutex_unlock(&dev
->mutex
);
1666 static struct vm_operations_struct comedi_vm_ops
= {
1667 .open
= comedi_vm_open
,
1668 .close
= comedi_vm_close
,
1671 static int comedi_mmap(struct file
*file
, struct vm_area_struct
*vma
)
1673 const unsigned minor
= iminor(file
->f_dentry
->d_inode
);
1674 struct comedi_async
*async
= NULL
;
1675 unsigned long start
= vma
->vm_start
;
1680 struct comedi_subdevice
*s
;
1681 struct comedi_device_file_info
*dev_file_info
;
1682 struct comedi_device
*dev
;
1684 dev_file_info
= comedi_get_device_file_info(minor
);
1685 if (dev_file_info
== NULL
)
1687 dev
= dev_file_info
->device
;
1691 mutex_lock(&dev
->mutex
);
1692 if (!dev
->attached
) {
1693 DPRINTK("no driver configured on comedi%i\n", dev
->minor
);
1697 if (vma
->vm_flags
& VM_WRITE
)
1698 s
= comedi_get_write_subdevice(dev_file_info
);
1700 s
= comedi_get_read_subdevice(dev_file_info
);
1707 if (async
== NULL
) {
1712 if (vma
->vm_pgoff
!= 0) {
1713 DPRINTK("comedi: mmap() offset must be 0.\n");
1718 size
= vma
->vm_end
- vma
->vm_start
;
1719 if (size
> async
->prealloc_bufsz
) {
1723 if (size
& (~PAGE_MASK
)) {
1728 n_pages
= size
>> PAGE_SHIFT
;
1729 for (i
= 0; i
< n_pages
; ++i
) {
1730 if (remap_pfn_range(vma
, start
,
1731 page_to_pfn(virt_to_page
1732 (async
->buf_page_list
1733 [i
].virt_addr
)), PAGE_SIZE
,
1741 vma
->vm_ops
= &comedi_vm_ops
;
1742 vma
->vm_private_data
= async
;
1744 async
->mmap_count
++;
1748 mutex_unlock(&dev
->mutex
);
1752 static unsigned int comedi_poll(struct file
*file
, poll_table
*wait
)
1754 unsigned int mask
= 0;
1755 const unsigned minor
= iminor(file
->f_dentry
->d_inode
);
1756 struct comedi_subdevice
*read_subdev
;
1757 struct comedi_subdevice
*write_subdev
;
1758 struct comedi_device_file_info
*dev_file_info
;
1759 struct comedi_device
*dev
;
1760 dev_file_info
= comedi_get_device_file_info(minor
);
1762 if (dev_file_info
== NULL
)
1764 dev
= dev_file_info
->device
;
1768 mutex_lock(&dev
->mutex
);
1769 if (!dev
->attached
) {
1770 DPRINTK("no driver configured on comedi%i\n", dev
->minor
);
1771 mutex_unlock(&dev
->mutex
);
1776 read_subdev
= comedi_get_read_subdevice(dev_file_info
);
1778 poll_wait(file
, &read_subdev
->async
->wait_head
, wait
);
1779 if (!read_subdev
->busy
1780 || comedi_buf_read_n_available(read_subdev
->async
) > 0
1781 || !(comedi_get_subdevice_runflags(read_subdev
) &
1783 mask
|= POLLIN
| POLLRDNORM
;
1786 write_subdev
= comedi_get_write_subdevice(dev_file_info
);
1788 poll_wait(file
, &write_subdev
->async
->wait_head
, wait
);
1789 comedi_buf_write_alloc(write_subdev
->async
,
1790 write_subdev
->async
->prealloc_bufsz
);
1791 if (!write_subdev
->busy
1792 || !(comedi_get_subdevice_runflags(write_subdev
) &
1794 || comedi_buf_write_n_allocated(write_subdev
->async
) >=
1795 bytes_per_sample(write_subdev
->async
->subdevice
)) {
1796 mask
|= POLLOUT
| POLLWRNORM
;
1800 mutex_unlock(&dev
->mutex
);
1804 static ssize_t
comedi_write(struct file
*file
, const char __user
*buf
,
1805 size_t nbytes
, loff_t
*offset
)
1807 struct comedi_subdevice
*s
;
1808 struct comedi_async
*async
;
1809 int n
, m
, count
= 0, retval
= 0;
1810 DECLARE_WAITQUEUE(wait
, current
);
1811 const unsigned minor
= iminor(file
->f_dentry
->d_inode
);
1812 struct comedi_device_file_info
*dev_file_info
;
1813 struct comedi_device
*dev
;
1814 dev_file_info
= comedi_get_device_file_info(minor
);
1816 if (dev_file_info
== NULL
)
1818 dev
= dev_file_info
->device
;
1822 if (!dev
->attached
) {
1823 DPRINTK("no driver configured on comedi%i\n", dev
->minor
);
1828 s
= comedi_get_write_subdevice(dev_file_info
);
1843 if (s
->busy
!= file
) {
1847 add_wait_queue(&async
->wait_head
, &wait
);
1848 while (nbytes
> 0 && !retval
) {
1849 set_current_state(TASK_INTERRUPTIBLE
);
1851 if (!(comedi_get_subdevice_runflags(s
) & SRF_RUNNING
)) {
1853 if (comedi_get_subdevice_runflags(s
) &
1859 do_become_nonbusy(dev
, s
);
1867 if (async
->buf_write_ptr
+ m
> async
->prealloc_bufsz
)
1868 m
= async
->prealloc_bufsz
- async
->buf_write_ptr
;
1869 comedi_buf_write_alloc(async
, async
->prealloc_bufsz
);
1870 if (m
> comedi_buf_write_n_allocated(async
))
1871 m
= comedi_buf_write_n_allocated(async
);
1876 if (file
->f_flags
& O_NONBLOCK
) {
1881 if (signal_pending(current
)) {
1882 retval
= -ERESTARTSYS
;
1887 if (s
->busy
!= file
) {
1894 m
= copy_from_user(async
->prealloc_buf
+ async
->buf_write_ptr
,
1900 comedi_buf_write_free(async
, n
);
1906 break; /* makes device work like a pipe */
1908 set_current_state(TASK_RUNNING
);
1909 remove_wait_queue(&async
->wait_head
, &wait
);
1912 return count
? count
: retval
;
1915 static ssize_t
comedi_read(struct file
*file
, char __user
*buf
, size_t nbytes
,
1918 struct comedi_subdevice
*s
;
1919 struct comedi_async
*async
;
1920 int n
, m
, count
= 0, retval
= 0;
1921 DECLARE_WAITQUEUE(wait
, current
);
1922 const unsigned minor
= iminor(file
->f_dentry
->d_inode
);
1923 struct comedi_device_file_info
*dev_file_info
;
1924 struct comedi_device
*dev
;
1925 dev_file_info
= comedi_get_device_file_info(minor
);
1927 if (dev_file_info
== NULL
)
1929 dev
= dev_file_info
->device
;
1933 if (!dev
->attached
) {
1934 DPRINTK("no driver configured on comedi%i\n", dev
->minor
);
1939 s
= comedi_get_read_subdevice(dev_file_info
);
1953 if (s
->busy
!= file
) {
1958 add_wait_queue(&async
->wait_head
, &wait
);
1959 while (nbytes
> 0 && !retval
) {
1960 set_current_state(TASK_INTERRUPTIBLE
);
1964 m
= comedi_buf_read_n_available(async
);
1965 /* printk("%d available\n",m); */
1966 if (async
->buf_read_ptr
+ m
> async
->prealloc_bufsz
)
1967 m
= async
->prealloc_bufsz
- async
->buf_read_ptr
;
1968 /* printk("%d contiguous\n",m); */
1973 if (!(comedi_get_subdevice_runflags(s
) & SRF_RUNNING
)) {
1974 do_become_nonbusy(dev
, s
);
1975 if (comedi_get_subdevice_runflags(s
) &
1983 if (file
->f_flags
& O_NONBLOCK
) {
1988 if (signal_pending(current
)) {
1989 retval
= -ERESTARTSYS
;
1996 if (s
->busy
!= file
) {
2002 m
= copy_to_user(buf
, async
->prealloc_buf
+
2003 async
->buf_read_ptr
, n
);
2009 comedi_buf_read_alloc(async
, n
);
2010 comedi_buf_read_free(async
, n
);
2016 break; /* makes device work like a pipe */
2018 if (!(comedi_get_subdevice_runflags(s
) & (SRF_ERROR
| SRF_RUNNING
)) &&
2019 async
->buf_read_count
- async
->buf_write_count
== 0) {
2020 do_become_nonbusy(dev
, s
);
2022 set_current_state(TASK_RUNNING
);
2023 remove_wait_queue(&async
->wait_head
, &wait
);
2026 return count
? count
: retval
;
2030 This function restores a subdevice to an idle state.
2032 static void do_become_nonbusy(struct comedi_device
*dev
,
2033 struct comedi_subdevice
*s
)
2035 struct comedi_async
*async
= s
->async
;
2037 comedi_set_subdevice_runflags(s
, SRF_RUNNING
, 0);
2039 comedi_reset_async_buf(async
);
2040 async
->inttrig
= NULL
;
2041 kfree(async
->cmd
.chanlist
);
2042 async
->cmd
.chanlist
= NULL
;
2044 dev_err(dev
->class_dev
,
2045 "BUG: (?) do_become_nonbusy called with async=NULL\n");
2051 static int comedi_open(struct inode
*inode
, struct file
*file
)
2053 const unsigned minor
= iminor(inode
);
2054 struct comedi_device_file_info
*dev_file_info
=
2055 comedi_get_device_file_info(minor
);
2056 struct comedi_device
*dev
=
2057 dev_file_info
? dev_file_info
->device
: NULL
;
2060 DPRINTK("invalid minor number\n");
2064 /* This is slightly hacky, but we want module autoloading
2066 * case: user opens device, attached -> ok
2067 * case: user opens device, unattached, in_request_module=0 -> autoload
2068 * case: user opens device, unattached, in_request_module=1 -> fail
2069 * case: root opens device, attached -> ok
2070 * case: root opens device, unattached, in_request_module=1 -> ok
2071 * (typically called from modprobe)
2072 * case: root opens device, unattached, in_request_module=0 -> autoload
2074 * The last could be changed to "-> ok", which would deny root
2077 mutex_lock(&dev
->mutex
);
2080 if (!capable(CAP_NET_ADMIN
) && dev
->in_request_module
) {
2081 DPRINTK("in request module\n");
2082 mutex_unlock(&dev
->mutex
);
2085 if (capable(CAP_NET_ADMIN
) && dev
->in_request_module
)
2088 dev
->in_request_module
= 1;
2091 mutex_unlock(&dev
->mutex
);
2092 request_module("char-major-%i-%i", COMEDI_MAJOR
, dev
->minor
);
2093 mutex_lock(&dev
->mutex
);
2096 dev
->in_request_module
= 0;
2098 if (!dev
->attached
&& !capable(CAP_NET_ADMIN
)) {
2099 DPRINTK("not attached and not CAP_NET_ADMIN\n");
2100 mutex_unlock(&dev
->mutex
);
2104 __module_get(THIS_MODULE
);
2106 if (dev
->attached
) {
2107 if (!try_module_get(dev
->driver
->module
)) {
2108 module_put(THIS_MODULE
);
2109 mutex_unlock(&dev
->mutex
);
2114 if (dev
->attached
&& dev
->use_count
== 0 && dev
->open
) {
2115 int rc
= dev
->open(dev
);
2117 module_put(dev
->driver
->module
);
2118 module_put(THIS_MODULE
);
2119 mutex_unlock(&dev
->mutex
);
2126 mutex_unlock(&dev
->mutex
);
2131 static int comedi_close(struct inode
*inode
, struct file
*file
)
2133 const unsigned minor
= iminor(inode
);
2134 struct comedi_subdevice
*s
= NULL
;
2136 struct comedi_device_file_info
*dev_file_info
;
2137 struct comedi_device
*dev
;
2138 dev_file_info
= comedi_get_device_file_info(minor
);
2140 if (dev_file_info
== NULL
)
2142 dev
= dev_file_info
->device
;
2146 mutex_lock(&dev
->mutex
);
2148 if (dev
->subdevices
) {
2149 for (i
= 0; i
< dev
->n_subdevices
; i
++) {
2150 s
= &dev
->subdevices
[i
];
2152 if (s
->busy
== file
)
2154 if (s
->lock
== file
)
2158 if (dev
->attached
&& dev
->use_count
== 1 && dev
->close
)
2161 module_put(THIS_MODULE
);
2163 module_put(dev
->driver
->module
);
2167 mutex_unlock(&dev
->mutex
);
2169 if (file
->f_flags
& FASYNC
)
2170 comedi_fasync(-1, file
, 0);
2175 static int comedi_fasync(int fd
, struct file
*file
, int on
)
2177 const unsigned minor
= iminor(file
->f_dentry
->d_inode
);
2178 struct comedi_device_file_info
*dev_file_info
;
2179 struct comedi_device
*dev
;
2180 dev_file_info
= comedi_get_device_file_info(minor
);
2182 if (dev_file_info
== NULL
)
2184 dev
= dev_file_info
->device
;
2188 return fasync_helper(fd
, file
, on
, &dev
->async_queue
);
2191 static const struct file_operations comedi_fops
= {
2192 .owner
= THIS_MODULE
,
2193 .unlocked_ioctl
= comedi_unlocked_ioctl
,
2194 .compat_ioctl
= comedi_compat_ioctl
,
2195 .open
= comedi_open
,
2196 .release
= comedi_close
,
2197 .read
= comedi_read
,
2198 .write
= comedi_write
,
2199 .mmap
= comedi_mmap
,
2200 .poll
= comedi_poll
,
2201 .fasync
= comedi_fasync
,
2202 .llseek
= noop_llseek
,
2205 static struct class *comedi_class
;
2206 static struct cdev comedi_cdev
;
2208 static void comedi_cleanup_legacy_minors(void)
2212 for (i
= 0; i
< comedi_num_legacy_minors
; i
++)
2213 comedi_free_board_minor(i
);
2216 static int __init
comedi_init(void)
2221 pr_info("comedi: version " COMEDI_RELEASE
" - http://www.comedi.org\n");
2223 if (comedi_num_legacy_minors
< 0 ||
2224 comedi_num_legacy_minors
> COMEDI_NUM_BOARD_MINORS
) {
2225 pr_err("comedi: error: invalid value for module parameter \"comedi_num_legacy_minors\". Valid values are 0 through %i.\n",
2226 COMEDI_NUM_BOARD_MINORS
);
2231 * comedi is unusable if both comedi_autoconfig and
2232 * comedi_num_legacy_minors are zero, so we might as well adjust the
2233 * defaults in that case
2235 if (comedi_autoconfig
== 0 && comedi_num_legacy_minors
== 0)
2236 comedi_num_legacy_minors
= 16;
2238 memset(comedi_file_info_table
, 0,
2239 sizeof(struct comedi_device_file_info
*) * COMEDI_NUM_MINORS
);
2241 retval
= register_chrdev_region(MKDEV(COMEDI_MAJOR
, 0),
2242 COMEDI_NUM_MINORS
, "comedi");
2245 cdev_init(&comedi_cdev
, &comedi_fops
);
2246 comedi_cdev
.owner
= THIS_MODULE
;
2247 kobject_set_name(&comedi_cdev
.kobj
, "comedi");
2248 if (cdev_add(&comedi_cdev
, MKDEV(COMEDI_MAJOR
, 0), COMEDI_NUM_MINORS
)) {
2249 unregister_chrdev_region(MKDEV(COMEDI_MAJOR
, 0),
2253 comedi_class
= class_create(THIS_MODULE
, "comedi");
2254 if (IS_ERR(comedi_class
)) {
2255 pr_err("comedi: failed to create class\n");
2256 cdev_del(&comedi_cdev
);
2257 unregister_chrdev_region(MKDEV(COMEDI_MAJOR
, 0),
2259 return PTR_ERR(comedi_class
);
2262 comedi_class
->dev_attrs
= comedi_dev_attrs
;
2264 /* XXX requires /proc interface */
2267 /* create devices files for legacy/manual use */
2268 for (i
= 0; i
< comedi_num_legacy_minors
; i
++) {
2270 minor
= comedi_alloc_board_minor(NULL
);
2272 comedi_cleanup_legacy_minors();
2273 cdev_del(&comedi_cdev
);
2274 unregister_chrdev_region(MKDEV(COMEDI_MAJOR
, 0),
2283 static void __exit
comedi_cleanup(void)
2287 comedi_cleanup_legacy_minors();
2288 for (i
= 0; i
< COMEDI_NUM_MINORS
; ++i
)
2289 BUG_ON(comedi_file_info_table
[i
]);
2291 class_destroy(comedi_class
);
2292 cdev_del(&comedi_cdev
);
2293 unregister_chrdev_region(MKDEV(COMEDI_MAJOR
, 0), COMEDI_NUM_MINORS
);
2295 comedi_proc_cleanup();
2298 module_init(comedi_init
);
2299 module_exit(comedi_cleanup
);
2301 void comedi_error(const struct comedi_device
*dev
, const char *s
)
2303 dev_err(dev
->class_dev
, "%s: %s\n", dev
->driver
->driver_name
, s
);
2305 EXPORT_SYMBOL(comedi_error
);
2307 void comedi_event(struct comedi_device
*dev
, struct comedi_subdevice
*s
)
2309 struct comedi_async
*async
= s
->async
;
2310 unsigned runflags
= 0;
2311 unsigned runflags_mask
= 0;
2313 /* DPRINTK("comedi_event 0x%x\n",mask); */
2315 if ((comedi_get_subdevice_runflags(s
) & SRF_RUNNING
) == 0)
2319 async
->events
& (COMEDI_CB_EOA
| COMEDI_CB_ERROR
|
2320 COMEDI_CB_OVERFLOW
)) {
2321 runflags_mask
|= SRF_RUNNING
;
2323 /* remember if an error event has occurred, so an error
2324 * can be returned the next time the user does a read() */
2325 if (s
->async
->events
& (COMEDI_CB_ERROR
| COMEDI_CB_OVERFLOW
)) {
2326 runflags_mask
|= SRF_ERROR
;
2327 runflags
|= SRF_ERROR
;
2329 if (runflags_mask
) {
2330 /*sets SRF_ERROR and SRF_RUNNING together atomically */
2331 comedi_set_subdevice_runflags(s
, runflags_mask
, runflags
);
2334 if (async
->cb_mask
& s
->async
->events
) {
2335 if (comedi_get_subdevice_runflags(s
) & SRF_USER
) {
2336 wake_up_interruptible(&async
->wait_head
);
2337 if (s
->subdev_flags
& SDF_CMD_READ
)
2338 kill_fasync(&dev
->async_queue
, SIGIO
, POLL_IN
);
2339 if (s
->subdev_flags
& SDF_CMD_WRITE
)
2340 kill_fasync(&dev
->async_queue
, SIGIO
, POLL_OUT
);
2343 async
->cb_func(s
->async
->events
, async
->cb_arg
);
2346 s
->async
->events
= 0;
2348 EXPORT_SYMBOL(comedi_event
);
2350 unsigned comedi_get_subdevice_runflags(struct comedi_subdevice
*s
)
2352 unsigned long flags
;
2355 spin_lock_irqsave(&s
->spin_lock
, flags
);
2356 runflags
= s
->runflags
;
2357 spin_unlock_irqrestore(&s
->spin_lock
, flags
);
2360 EXPORT_SYMBOL(comedi_get_subdevice_runflags
);
2362 static int is_device_busy(struct comedi_device
*dev
)
2364 struct comedi_subdevice
*s
;
2370 for (i
= 0; i
< dev
->n_subdevices
; i
++) {
2371 s
= &dev
->subdevices
[i
];
2374 if (s
->async
&& s
->async
->mmap_count
)
2381 static void comedi_device_init(struct comedi_device
*dev
)
2383 memset(dev
, 0, sizeof(struct comedi_device
));
2384 spin_lock_init(&dev
->spinlock
);
2385 mutex_init(&dev
->mutex
);
2389 static void comedi_device_cleanup(struct comedi_device
*dev
)
2393 mutex_lock(&dev
->mutex
);
2394 comedi_device_detach(dev
);
2395 mutex_unlock(&dev
->mutex
);
2396 mutex_destroy(&dev
->mutex
);
2399 int comedi_alloc_board_minor(struct device
*hardware_device
)
2401 struct comedi_device_file_info
*info
;
2402 struct device
*csdev
;
2405 info
= kzalloc(sizeof(struct comedi_device_file_info
), GFP_KERNEL
);
2408 info
->device
= kzalloc(sizeof(struct comedi_device
), GFP_KERNEL
);
2409 if (info
->device
== NULL
) {
2413 info
->hardware_device
= hardware_device
;
2414 comedi_device_init(info
->device
);
2415 spin_lock(&comedi_file_info_table_lock
);
2416 for (i
= 0; i
< COMEDI_NUM_BOARD_MINORS
; ++i
) {
2417 if (comedi_file_info_table
[i
] == NULL
) {
2418 comedi_file_info_table
[i
] = info
;
2422 spin_unlock(&comedi_file_info_table_lock
);
2423 if (i
== COMEDI_NUM_BOARD_MINORS
) {
2424 comedi_device_cleanup(info
->device
);
2425 kfree(info
->device
);
2427 pr_err("comedi: error: ran out of minor numbers for board device files.\n");
2430 info
->device
->minor
= i
;
2431 csdev
= device_create(comedi_class
, hardware_device
,
2432 MKDEV(COMEDI_MAJOR
, i
), NULL
, "comedi%i", i
);
2434 info
->device
->class_dev
= csdev
;
2435 dev_set_drvdata(csdev
, info
);
2440 void comedi_free_board_minor(unsigned minor
)
2442 struct comedi_device_file_info
*info
;
2444 BUG_ON(minor
>= COMEDI_NUM_BOARD_MINORS
);
2445 spin_lock(&comedi_file_info_table_lock
);
2446 info
= comedi_file_info_table
[minor
];
2447 comedi_file_info_table
[minor
] = NULL
;
2448 spin_unlock(&comedi_file_info_table_lock
);
2451 struct comedi_device
*dev
= info
->device
;
2453 if (dev
->class_dev
) {
2454 device_destroy(comedi_class
,
2455 MKDEV(COMEDI_MAJOR
, dev
->minor
));
2457 comedi_device_cleanup(dev
);
2464 int comedi_find_board_minor(struct device
*hardware_device
)
2467 struct comedi_device_file_info
*info
;
2469 for (minor
= 0; minor
< COMEDI_NUM_BOARD_MINORS
; minor
++) {
2470 spin_lock(&comedi_file_info_table_lock
);
2471 info
= comedi_file_info_table
[minor
];
2472 if (info
&& info
->hardware_device
== hardware_device
) {
2473 spin_unlock(&comedi_file_info_table_lock
);
2476 spin_unlock(&comedi_file_info_table_lock
);
2481 int comedi_alloc_subdevice_minor(struct comedi_device
*dev
,
2482 struct comedi_subdevice
*s
)
2484 struct comedi_device_file_info
*info
;
2485 struct device
*csdev
;
2488 info
= kmalloc(sizeof(struct comedi_device_file_info
), GFP_KERNEL
);
2492 info
->read_subdevice
= s
;
2493 info
->write_subdevice
= s
;
2494 spin_lock(&comedi_file_info_table_lock
);
2495 for (i
= COMEDI_FIRST_SUBDEVICE_MINOR
; i
< COMEDI_NUM_MINORS
; ++i
) {
2496 if (comedi_file_info_table
[i
] == NULL
) {
2497 comedi_file_info_table
[i
] = info
;
2501 spin_unlock(&comedi_file_info_table_lock
);
2502 if (i
== COMEDI_NUM_MINORS
) {
2504 pr_err("comedi: error: ran out of minor numbers for board device files.\n");
2508 csdev
= device_create(comedi_class
, dev
->class_dev
,
2509 MKDEV(COMEDI_MAJOR
, i
), NULL
, "comedi%i_subd%i",
2510 dev
->minor
, (int)(s
- dev
->subdevices
));
2512 s
->class_dev
= csdev
;
2513 dev_set_drvdata(csdev
, info
);
2518 void comedi_free_subdevice_minor(struct comedi_subdevice
*s
)
2520 struct comedi_device_file_info
*info
;
2527 BUG_ON(s
->minor
>= COMEDI_NUM_MINORS
);
2528 BUG_ON(s
->minor
< COMEDI_FIRST_SUBDEVICE_MINOR
);
2530 spin_lock(&comedi_file_info_table_lock
);
2531 info
= comedi_file_info_table
[s
->minor
];
2532 comedi_file_info_table
[s
->minor
] = NULL
;
2533 spin_unlock(&comedi_file_info_table_lock
);
2536 device_destroy(comedi_class
, MKDEV(COMEDI_MAJOR
, s
->minor
));
2537 s
->class_dev
= NULL
;
2542 struct comedi_device_file_info
*comedi_get_device_file_info(unsigned minor
)
2544 struct comedi_device_file_info
*info
;
2546 BUG_ON(minor
>= COMEDI_NUM_MINORS
);
2547 spin_lock(&comedi_file_info_table_lock
);
2548 info
= comedi_file_info_table
[minor
];
2549 spin_unlock(&comedi_file_info_table_lock
);
2552 EXPORT_SYMBOL_GPL(comedi_get_device_file_info
);