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 #define __NO_VERSION__
27 #include "comedi_fops.h"
28 #include "comedi_compat32.h"
30 #include <linux/module.h>
31 #include <linux/errno.h>
32 #include <linux/kernel.h>
33 #include <linux/sched.h>
34 #include <linux/fcntl.h>
35 #include <linux/delay.h>
36 #include <linux/ioport.h>
38 #include <linux/slab.h>
39 #include <linux/kmod.h>
40 #include <linux/poll.h>
41 #include <linux/init.h>
42 #include <linux/device.h>
43 #include <linux/vmalloc.h>
45 #include "comedidev.h"
46 #include <linux/cdev.h>
47 #include <linux/stat.h>
50 #include <linux/uaccess.h>
54 MODULE_AUTHOR("http://www.comedi.org");
55 MODULE_DESCRIPTION("Comedi core module");
56 MODULE_LICENSE("GPL");
58 #ifdef CONFIG_COMEDI_DEBUG
60 EXPORT_SYMBOL(comedi_debug
);
61 module_param(comedi_debug
, int, 0644);
64 int comedi_autoconfig
= 1;
65 module_param(comedi_autoconfig
, bool, 0444);
67 static int comedi_num_legacy_minors
;
68 module_param(comedi_num_legacy_minors
, int, 0444);
70 static DEFINE_SPINLOCK(comedi_file_info_table_lock
);
71 static struct comedi_device_file_info
72 *comedi_file_info_table
[COMEDI_NUM_MINORS
];
74 static int do_devconfig_ioctl(struct comedi_device
*dev
,
75 struct comedi_devconfig __user
*arg
);
76 static int do_bufconfig_ioctl(struct comedi_device
*dev
,
77 struct comedi_bufconfig __user
*arg
);
78 static int do_devinfo_ioctl(struct comedi_device
*dev
,
79 struct comedi_devinfo __user
*arg
,
81 static int do_subdinfo_ioctl(struct comedi_device
*dev
,
82 struct comedi_subdinfo __user
*arg
, void *file
);
83 static int do_chaninfo_ioctl(struct comedi_device
*dev
,
84 struct comedi_chaninfo __user
*arg
);
85 static int do_bufinfo_ioctl(struct comedi_device
*dev
,
86 struct comedi_bufinfo __user
*arg
, void *file
);
87 static int do_cmd_ioctl(struct comedi_device
*dev
,
88 struct comedi_cmd __user
*arg
, void *file
);
89 static int do_lock_ioctl(struct comedi_device
*dev
, unsigned int arg
,
91 static int do_unlock_ioctl(struct comedi_device
*dev
, unsigned int arg
,
93 static int do_cancel_ioctl(struct comedi_device
*dev
, unsigned int arg
,
95 static int do_cmdtest_ioctl(struct comedi_device
*dev
,
96 struct comedi_cmd __user
*arg
, void *file
);
97 static int do_insnlist_ioctl(struct comedi_device
*dev
,
98 struct comedi_insnlist __user
*arg
, void *file
);
99 static int do_insn_ioctl(struct comedi_device
*dev
,
100 struct comedi_insn __user
*arg
, void *file
);
101 static int do_poll_ioctl(struct comedi_device
*dev
, unsigned int subd
,
104 extern void do_become_nonbusy(struct comedi_device
*dev
,
105 struct comedi_subdevice
*s
);
106 static int do_cancel(struct comedi_device
*dev
, struct comedi_subdevice
*s
);
108 static int comedi_fasync(int fd
, struct file
*file
, int on
);
110 static int is_device_busy(struct comedi_device
*dev
);
111 static int resize_async_buffer(struct comedi_device
*dev
,
112 struct comedi_subdevice
*s
,
113 struct comedi_async
*async
, unsigned new_size
);
115 /* declarations for sysfs attribute files */
116 static struct device_attribute dev_attr_max_read_buffer_kb
;
117 static struct device_attribute dev_attr_read_buffer_kb
;
118 static struct device_attribute dev_attr_max_write_buffer_kb
;
119 static struct device_attribute dev_attr_write_buffer_kb
;
121 static long comedi_unlocked_ioctl(struct file
*file
, unsigned int cmd
,
124 const unsigned minor
= iminor(file
->f_dentry
->d_inode
);
125 struct comedi_device_file_info
*dev_file_info
=
126 comedi_get_device_file_info(minor
);
127 struct comedi_device
*dev
;
130 if (dev_file_info
== NULL
|| dev_file_info
->device
== NULL
)
132 dev
= dev_file_info
->device
;
134 mutex_lock(&dev
->mutex
);
136 /* Device config is special, because it must work on
137 * an unconfigured device. */
138 if (cmd
== COMEDI_DEVCONFIG
) {
139 rc
= do_devconfig_ioctl(dev
,
140 (struct comedi_devconfig __user
*)arg
);
144 if (!dev
->attached
) {
145 DPRINTK("no driver configured on /dev/comedi%i\n", dev
->minor
);
151 case COMEDI_BUFCONFIG
:
152 rc
= do_bufconfig_ioctl(dev
,
153 (struct comedi_bufconfig __user
*)arg
);
156 rc
= do_devinfo_ioctl(dev
, (struct comedi_devinfo __user
*)arg
,
159 case COMEDI_SUBDINFO
:
160 rc
= do_subdinfo_ioctl(dev
,
161 (struct comedi_subdinfo __user
*)arg
,
164 case COMEDI_CHANINFO
:
165 rc
= do_chaninfo_ioctl(dev
, (void __user
*)arg
);
167 case COMEDI_RANGEINFO
:
168 rc
= do_rangeinfo_ioctl(dev
, (void __user
*)arg
);
171 rc
= do_bufinfo_ioctl(dev
,
172 (struct comedi_bufinfo __user
*)arg
,
176 rc
= do_lock_ioctl(dev
, arg
, file
);
179 rc
= do_unlock_ioctl(dev
, arg
, file
);
182 rc
= do_cancel_ioctl(dev
, arg
, file
);
185 rc
= do_cmd_ioctl(dev
, (struct comedi_cmd __user
*)arg
, file
);
188 rc
= do_cmdtest_ioctl(dev
, (struct comedi_cmd __user
*)arg
,
191 case COMEDI_INSNLIST
:
192 rc
= do_insnlist_ioctl(dev
,
193 (struct comedi_insnlist __user
*)arg
,
197 rc
= do_insn_ioctl(dev
, (struct comedi_insn __user
*)arg
,
201 rc
= do_poll_ioctl(dev
, arg
, file
);
209 mutex_unlock(&dev
->mutex
);
218 pointer to devconfig structure
221 devconfig structure at arg
226 static int do_devconfig_ioctl(struct comedi_device
*dev
,
227 struct comedi_devconfig __user
*arg
)
229 struct comedi_devconfig it
;
231 unsigned char *aux_data
= NULL
;
234 if (!capable(CAP_SYS_ADMIN
))
238 if (is_device_busy(dev
))
241 struct module
*driver_module
= dev
->driver
->module
;
242 comedi_device_detach(dev
);
243 module_put(driver_module
);
248 if (copy_from_user(&it
, arg
, sizeof(struct comedi_devconfig
)))
251 it
.board_name
[COMEDI_NAMELEN
- 1] = 0;
253 if (comedi_aux_data(it
.options
, 0) &&
254 it
.options
[COMEDI_DEVCONF_AUX_DATA_LENGTH
]) {
256 aux_len
= it
.options
[COMEDI_DEVCONF_AUX_DATA_LENGTH
];
260 aux_data
= vmalloc(aux_len
);
264 if (copy_from_user(aux_data
,
265 comedi_aux_data(it
.options
, 0), aux_len
)) {
269 it
.options
[COMEDI_DEVCONF_AUX_DATA_LO
] =
270 (unsigned long)aux_data
;
271 if (sizeof(void *) > sizeof(int)) {
272 bit_shift
= sizeof(int) * 8;
273 it
.options
[COMEDI_DEVCONF_AUX_DATA_HI
] =
274 ((unsigned long)aux_data
) >> bit_shift
;
276 it
.options
[COMEDI_DEVCONF_AUX_DATA_HI
] = 0;
279 ret
= comedi_device_attach(dev
, &it
);
281 if (!try_module_get(dev
->driver
->module
)) {
282 comedi_device_detach(dev
);
295 buffer configuration ioctl
298 pointer to bufconfig structure
304 modified bufconfig at arg
307 static int do_bufconfig_ioctl(struct comedi_device
*dev
,
308 struct comedi_bufconfig __user
*arg
)
310 struct comedi_bufconfig bc
;
311 struct comedi_async
*async
;
312 struct comedi_subdevice
*s
;
315 if (copy_from_user(&bc
, arg
, sizeof(struct comedi_bufconfig
)))
318 if (bc
.subdevice
>= dev
->n_subdevices
|| bc
.subdevice
< 0)
321 s
= dev
->subdevices
+ bc
.subdevice
;
325 DPRINTK("subdevice does not have async capability\n");
331 if (bc
.maximum_size
) {
332 if (!capable(CAP_SYS_ADMIN
))
335 async
->max_bufsize
= bc
.maximum_size
;
339 retval
= resize_async_buffer(dev
, s
, async
, bc
.size
);
344 bc
.size
= async
->prealloc_bufsz
;
345 bc
.maximum_size
= async
->max_bufsize
;
348 if (copy_to_user(arg
, &bc
, sizeof(struct comedi_bufconfig
)))
359 pointer to devinfo structure
368 static int do_devinfo_ioctl(struct comedi_device
*dev
,
369 struct comedi_devinfo __user
*arg
,
372 struct comedi_devinfo devinfo
;
373 const unsigned minor
= iminor(file
->f_dentry
->d_inode
);
374 struct comedi_device_file_info
*dev_file_info
=
375 comedi_get_device_file_info(minor
);
376 struct comedi_subdevice
*read_subdev
=
377 comedi_get_read_subdevice(dev_file_info
);
378 struct comedi_subdevice
*write_subdev
=
379 comedi_get_write_subdevice(dev_file_info
);
381 memset(&devinfo
, 0, sizeof(devinfo
));
383 /* fill devinfo structure */
384 devinfo
.version_code
= COMEDI_VERSION_CODE
;
385 devinfo
.n_subdevs
= dev
->n_subdevices
;
386 memcpy(devinfo
.driver_name
, dev
->driver
->driver_name
, COMEDI_NAMELEN
);
387 memcpy(devinfo
.board_name
, dev
->board_name
, COMEDI_NAMELEN
);
390 devinfo
.read_subdevice
= read_subdev
- dev
->subdevices
;
392 devinfo
.read_subdevice
= -1;
395 devinfo
.write_subdevice
= write_subdev
- dev
->subdevices
;
397 devinfo
.write_subdevice
= -1;
399 if (copy_to_user(arg
, &devinfo
, sizeof(struct comedi_devinfo
)))
410 pointer to array of subdevice info structures
416 array of subdevice info structures at arg
419 static int do_subdinfo_ioctl(struct comedi_device
*dev
,
420 struct comedi_subdinfo __user
*arg
, void *file
)
423 struct comedi_subdinfo
*tmp
, *us
;
424 struct comedi_subdevice
*s
;
427 kcalloc(dev
->n_subdevices
, sizeof(struct comedi_subdinfo
),
432 /* fill subdinfo structs */
433 for (i
= 0; i
< dev
->n_subdevices
; i
++) {
434 s
= dev
->subdevices
+ i
;
438 us
->n_chan
= s
->n_chan
;
439 us
->subd_flags
= s
->subdev_flags
;
440 if (comedi_get_subdevice_runflags(s
) & SRF_RUNNING
)
441 us
->subd_flags
|= SDF_RUNNING
;
442 #define TIMER_nanosec 5 /* backwards compatibility */
443 us
->timer_type
= TIMER_nanosec
;
444 us
->len_chanlist
= s
->len_chanlist
;
445 us
->maxdata
= s
->maxdata
;
446 if (s
->range_table
) {
448 (i
<< 24) | (0 << 16) | (s
->range_table
->length
);
450 us
->range_type
= 0; /* XXX */
452 us
->flags
= s
->flags
;
455 us
->subd_flags
|= SDF_BUSY
;
457 us
->subd_flags
|= SDF_BUSY_OWNER
;
459 us
->subd_flags
|= SDF_LOCKED
;
461 us
->subd_flags
|= SDF_LOCK_OWNER
;
462 if (!s
->maxdata
&& s
->maxdata_list
)
463 us
->subd_flags
|= SDF_MAXDATA
;
465 us
->subd_flags
|= SDF_FLAGS
;
466 if (s
->range_table_list
)
467 us
->subd_flags
|= SDF_RANGETYPE
;
469 us
->subd_flags
|= SDF_CMD
;
471 if (s
->insn_bits
!= &insn_inval
)
472 us
->insn_bits_support
= COMEDI_SUPPORTED
;
474 us
->insn_bits_support
= COMEDI_UNSUPPORTED
;
476 us
->settling_time_0
= s
->settling_time_0
;
479 ret
= copy_to_user(arg
, tmp
,
480 dev
->n_subdevices
* sizeof(struct comedi_subdinfo
));
484 return ret
? -EFAULT
: 0;
492 pointer to chaninfo structure
495 chaninfo structure at arg
498 arrays at elements of chaninfo structure
501 static int do_chaninfo_ioctl(struct comedi_device
*dev
,
502 struct comedi_chaninfo __user
*arg
)
504 struct comedi_subdevice
*s
;
505 struct comedi_chaninfo it
;
507 if (copy_from_user(&it
, arg
, sizeof(struct comedi_chaninfo
)))
510 if (it
.subdev
>= dev
->n_subdevices
)
512 s
= dev
->subdevices
+ it
.subdev
;
514 if (it
.maxdata_list
) {
515 if (s
->maxdata
|| !s
->maxdata_list
)
517 if (copy_to_user(it
.maxdata_list
, s
->maxdata_list
,
518 s
->n_chan
* sizeof(unsigned int)))
525 if (copy_to_user(it
.flaglist
, s
->flaglist
,
526 s
->n_chan
* sizeof(unsigned int)))
533 if (!s
->range_table_list
)
535 for (i
= 0; i
< s
->n_chan
; i
++) {
538 x
= (dev
->minor
<< 28) | (it
.subdev
<< 24) | (i
<< 16) |
539 (s
->range_table_list
[i
]->length
);
540 if (put_user(x
, it
.rangelist
+ i
))
544 if (copy_to_user(it
.rangelist
, s
->range_type_list
,
545 s
->n_chan
* sizeof(unsigned int)))
555 buffer information ioctl
558 pointer to bufinfo structure
564 modified bufinfo at arg
567 static int do_bufinfo_ioctl(struct comedi_device
*dev
,
568 struct comedi_bufinfo __user
*arg
, void *file
)
570 struct comedi_bufinfo bi
;
571 struct comedi_subdevice
*s
;
572 struct comedi_async
*async
;
574 if (copy_from_user(&bi
, arg
, sizeof(struct comedi_bufinfo
)))
577 if (bi
.subdevice
>= dev
->n_subdevices
|| bi
.subdevice
< 0)
580 s
= dev
->subdevices
+ bi
.subdevice
;
582 if (s
->lock
&& s
->lock
!= file
)
588 DPRINTK("subdevice does not have async capability\n");
589 bi
.buf_write_ptr
= 0;
591 bi
.buf_write_count
= 0;
592 bi
.buf_read_count
= 0;
594 bi
.bytes_written
= 0;
599 bi
.bytes_written
= 0;
600 goto copyback_position
;
605 if (bi
.bytes_read
&& (s
->subdev_flags
& SDF_CMD_READ
)) {
606 bi
.bytes_read
= comedi_buf_read_alloc(async
, bi
.bytes_read
);
607 comedi_buf_read_free(async
, bi
.bytes_read
);
609 if (!(comedi_get_subdevice_runflags(s
) & (SRF_ERROR
|
611 && async
->buf_write_count
== async
->buf_read_count
) {
612 do_become_nonbusy(dev
, s
);
616 if (bi
.bytes_written
&& (s
->subdev_flags
& SDF_CMD_WRITE
)) {
618 comedi_buf_write_alloc(async
, bi
.bytes_written
);
619 comedi_buf_write_free(async
, bi
.bytes_written
);
623 bi
.buf_write_count
= async
->buf_write_count
;
624 bi
.buf_write_ptr
= async
->buf_write_ptr
;
625 bi
.buf_read_count
= async
->buf_read_count
;
626 bi
.buf_read_ptr
= async
->buf_read_ptr
;
629 if (copy_to_user(arg
, &bi
, sizeof(struct comedi_bufinfo
)))
635 static int parse_insn(struct comedi_device
*dev
, struct comedi_insn
*insn
,
636 unsigned int *data
, void *file
);
639 * synchronous instructions
642 * pointer to sync cmd structure
645 * sync cmd struct at arg
652 /* arbitrary limits */
653 #define MAX_SAMPLES 256
654 static int do_insnlist_ioctl(struct comedi_device
*dev
,
655 struct comedi_insnlist __user
*arg
, void *file
)
657 struct comedi_insnlist insnlist
;
658 struct comedi_insn
*insns
= NULL
;
659 unsigned int *data
= NULL
;
663 if (copy_from_user(&insnlist
, arg
, sizeof(struct comedi_insnlist
)))
666 data
= kmalloc(sizeof(unsigned int) * MAX_SAMPLES
, GFP_KERNEL
);
668 DPRINTK("kmalloc failed\n");
674 kmalloc(sizeof(struct comedi_insn
) * insnlist
.n_insns
, GFP_KERNEL
);
676 DPRINTK("kmalloc failed\n");
681 if (copy_from_user(insns
, insnlist
.insns
,
682 sizeof(struct comedi_insn
) * insnlist
.n_insns
)) {
683 DPRINTK("copy_from_user failed\n");
688 for (i
= 0; i
< insnlist
.n_insns
; i
++) {
689 if (insns
[i
].n
> MAX_SAMPLES
) {
690 DPRINTK("number of samples too large\n");
694 if (insns
[i
].insn
& INSN_MASK_WRITE
) {
695 if (copy_from_user(data
, insns
[i
].data
,
696 insns
[i
].n
* sizeof(unsigned int))) {
697 DPRINTK("copy_from_user failed\n");
702 ret
= parse_insn(dev
, insns
+ i
, data
, file
);
705 if (insns
[i
].insn
& INSN_MASK_READ
) {
706 if (copy_to_user(insns
[i
].data
, data
,
707 insns
[i
].n
* sizeof(unsigned int))) {
708 DPRINTK("copy_to_user failed\n");
726 static int check_insn_config_length(struct comedi_insn
*insn
,
733 case INSN_CONFIG_DIO_OUTPUT
:
734 case INSN_CONFIG_DIO_INPUT
:
735 case INSN_CONFIG_DISARM
:
736 case INSN_CONFIG_RESET
:
740 case INSN_CONFIG_ARM
:
741 case INSN_CONFIG_DIO_QUERY
:
742 case INSN_CONFIG_BLOCK_SIZE
:
743 case INSN_CONFIG_FILTER
:
744 case INSN_CONFIG_SERIAL_CLOCK
:
745 case INSN_CONFIG_BIDIRECTIONAL_DATA
:
746 case INSN_CONFIG_ALT_SOURCE
:
747 case INSN_CONFIG_SET_COUNTER_MODE
:
748 case INSN_CONFIG_8254_READ_STATUS
:
749 case INSN_CONFIG_SET_ROUTING
:
750 case INSN_CONFIG_GET_ROUTING
:
751 case INSN_CONFIG_GET_PWM_STATUS
:
752 case INSN_CONFIG_PWM_SET_PERIOD
:
753 case INSN_CONFIG_PWM_GET_PERIOD
:
757 case INSN_CONFIG_SET_GATE_SRC
:
758 case INSN_CONFIG_GET_GATE_SRC
:
759 case INSN_CONFIG_SET_CLOCK_SRC
:
760 case INSN_CONFIG_GET_CLOCK_SRC
:
761 case INSN_CONFIG_SET_OTHER_SRC
:
762 case INSN_CONFIG_GET_COUNTER_STATUS
:
763 case INSN_CONFIG_PWM_SET_H_BRIDGE
:
764 case INSN_CONFIG_PWM_GET_H_BRIDGE
:
765 case INSN_CONFIG_GET_HARDWARE_BUFFER_SIZE
:
769 case INSN_CONFIG_PWM_OUTPUT
:
770 case INSN_CONFIG_ANALOG_TRIG
:
774 /* by default we allow the insn since we don't have checks for
775 * all possible cases yet */
778 "comedi: no check for data length of config insn id "
779 "%i is implemented.\n"
780 " Add a check to %s in %s.\n"
781 " Assuming n=%i is correct.\n", data
[0], __func__
,
789 static int parse_insn(struct comedi_device
*dev
, struct comedi_insn
*insn
,
790 unsigned int *data
, void *file
)
792 struct comedi_subdevice
*s
;
796 if (insn
->insn
& INSN_MASK_SPECIAL
) {
797 /* a non-subdevice instruction */
799 switch (insn
->insn
) {
809 do_gettimeofday(&tv
);
811 data
[1] = tv
.tv_usec
;
817 if (insn
->n
!= 1 || data
[0] >= 100000) {
821 udelay(data
[0] / 1000);
829 if (insn
->subdev
>= dev
->n_subdevices
) {
830 DPRINTK("%d not usable subdevice\n",
835 s
= dev
->subdevices
+ insn
->subdev
;
837 DPRINTK("no async\n");
841 if (!s
->async
->inttrig
) {
842 DPRINTK("no inttrig\n");
846 ret
= s
->async
->inttrig(dev
, s
, insn
->data
[0]);
851 DPRINTK("invalid insn\n");
856 /* a subdevice instruction */
857 unsigned int maxdata
;
859 if (insn
->subdev
>= dev
->n_subdevices
) {
860 DPRINTK("subdevice %d out of range\n", insn
->subdev
);
864 s
= dev
->subdevices
+ insn
->subdev
;
866 if (s
->type
== COMEDI_SUBD_UNUSED
) {
867 DPRINTK("%d not usable subdevice\n", insn
->subdev
);
872 /* are we locked? (ioctl lock) */
873 if (s
->lock
&& s
->lock
!= file
) {
874 DPRINTK("device locked\n");
879 ret
= comedi_check_chanlist(s
, 1, &insn
->chanspec
);
882 DPRINTK("bad chanspec\n");
890 /* This looks arbitrary. It is. */
891 s
->busy
= &parse_insn
;
892 switch (insn
->insn
) {
894 ret
= s
->insn_read(dev
, s
, insn
, data
);
897 maxdata
= s
->maxdata_list
898 ? s
->maxdata_list
[CR_CHAN(insn
->chanspec
)]
900 for (i
= 0; i
< insn
->n
; ++i
) {
901 if (data
[i
] > maxdata
) {
903 DPRINTK("bad data value(s)\n");
908 ret
= s
->insn_write(dev
, s
, insn
, data
);
915 ret
= s
->insn_bits(dev
, s
, insn
, data
);
918 ret
= check_insn_config_length(insn
, data
);
921 ret
= s
->insn_config(dev
, s
, insn
, data
);
937 * synchronous instructions
943 * struct comedi_insn struct at arg
949 static int do_insn_ioctl(struct comedi_device
*dev
,
950 struct comedi_insn __user
*arg
, void *file
)
952 struct comedi_insn insn
;
953 unsigned int *data
= NULL
;
956 data
= kmalloc(sizeof(unsigned int) * MAX_SAMPLES
, GFP_KERNEL
);
962 if (copy_from_user(&insn
, arg
, sizeof(struct comedi_insn
))) {
967 /* This is where the behavior of insn and insnlist deviate. */
968 if (insn
.n
> MAX_SAMPLES
)
969 insn
.n
= MAX_SAMPLES
;
970 if (insn
.insn
& INSN_MASK_WRITE
) {
971 if (copy_from_user(data
,
973 insn
.n
* sizeof(unsigned int))) {
978 ret
= parse_insn(dev
, &insn
, data
, file
);
981 if (insn
.insn
& INSN_MASK_READ
) {
982 if (copy_to_user(insn
.data
,
984 insn
.n
* sizeof(unsigned int))) {
997 static void comedi_set_subdevice_runflags(struct comedi_subdevice
*s
,
998 unsigned mask
, unsigned bits
)
1000 unsigned long flags
;
1002 spin_lock_irqsave(&s
->spin_lock
, flags
);
1003 s
->runflags
&= ~mask
;
1004 s
->runflags
|= (bits
& mask
);
1005 spin_unlock_irqrestore(&s
->spin_lock
, flags
);
1008 static int do_cmd_ioctl(struct comedi_device
*dev
,
1009 struct comedi_cmd __user
*cmd
, void *file
)
1011 struct comedi_cmd user_cmd
;
1012 struct comedi_subdevice
*s
;
1013 struct comedi_async
*async
;
1015 unsigned int __user
*chanlist_saver
= NULL
;
1017 if (copy_from_user(&user_cmd
, cmd
, sizeof(struct comedi_cmd
))) {
1018 DPRINTK("bad cmd address\n");
1021 /* save user's chanlist pointer so it can be restored later */
1022 chanlist_saver
= user_cmd
.chanlist
;
1024 if (user_cmd
.subdev
>= dev
->n_subdevices
) {
1025 DPRINTK("%d no such subdevice\n", user_cmd
.subdev
);
1029 s
= dev
->subdevices
+ user_cmd
.subdev
;
1032 if (s
->type
== COMEDI_SUBD_UNUSED
) {
1033 DPRINTK("%d not valid subdevice\n", user_cmd
.subdev
);
1037 if (!s
->do_cmd
|| !s
->do_cmdtest
|| !s
->async
) {
1038 DPRINTK("subdevice %i does not support commands\n",
1043 /* are we locked? (ioctl lock) */
1044 if (s
->lock
&& s
->lock
!= file
) {
1045 DPRINTK("subdevice locked\n");
1051 DPRINTK("subdevice busy\n");
1056 /* make sure channel/gain list isn't too long */
1057 if (user_cmd
.chanlist_len
> s
->len_chanlist
) {
1058 DPRINTK("channel/gain list too long %u > %d\n",
1059 user_cmd
.chanlist_len
, s
->len_chanlist
);
1064 /* make sure channel/gain list isn't too short */
1065 if (user_cmd
.chanlist_len
< 1) {
1066 DPRINTK("channel/gain list too short %u < 1\n",
1067 user_cmd
.chanlist_len
);
1072 kfree(async
->cmd
.chanlist
);
1073 async
->cmd
= user_cmd
;
1074 async
->cmd
.data
= NULL
;
1075 /* load channel/gain list */
1076 async
->cmd
.chanlist
=
1077 kmalloc(async
->cmd
.chanlist_len
* sizeof(int), GFP_KERNEL
);
1078 if (!async
->cmd
.chanlist
) {
1079 DPRINTK("allocation failed\n");
1084 if (copy_from_user(async
->cmd
.chanlist
, user_cmd
.chanlist
,
1085 async
->cmd
.chanlist_len
* sizeof(int))) {
1086 DPRINTK("fault reading chanlist\n");
1091 /* make sure each element in channel/gain list is valid */
1092 ret
= comedi_check_chanlist(s
,
1093 async
->cmd
.chanlist_len
,
1094 async
->cmd
.chanlist
);
1096 DPRINTK("bad chanlist\n");
1100 ret
= s
->do_cmdtest(dev
, s
, &async
->cmd
);
1102 if (async
->cmd
.flags
& TRIG_BOGUS
|| ret
) {
1103 DPRINTK("test returned %d\n", ret
);
1104 user_cmd
= async
->cmd
;
1105 /* restore chanlist pointer before copying back */
1106 user_cmd
.chanlist
= chanlist_saver
;
1107 user_cmd
.data
= NULL
;
1108 if (copy_to_user(cmd
, &user_cmd
, sizeof(struct comedi_cmd
))) {
1109 DPRINTK("fault writing cmd\n");
1117 if (!async
->prealloc_bufsz
) {
1119 DPRINTK("no buffer (?)\n");
1123 comedi_reset_async_buf(async
);
1126 COMEDI_CB_EOA
| COMEDI_CB_BLOCK
| COMEDI_CB_ERROR
|
1128 if (async
->cmd
.flags
& TRIG_WAKE_EOS
)
1129 async
->cb_mask
|= COMEDI_CB_EOS
;
1131 comedi_set_subdevice_runflags(s
, ~0, SRF_USER
| SRF_RUNNING
);
1133 ret
= s
->do_cmd(dev
, s
);
1138 do_become_nonbusy(dev
, s
);
1145 command testing ioctl
1148 pointer to cmd structure
1151 cmd structure at arg
1155 modified cmd structure at arg
1158 static int do_cmdtest_ioctl(struct comedi_device
*dev
,
1159 struct comedi_cmd __user
*arg
, void *file
)
1161 struct comedi_cmd user_cmd
;
1162 struct comedi_subdevice
*s
;
1164 unsigned int *chanlist
= NULL
;
1165 unsigned int __user
*chanlist_saver
= NULL
;
1167 if (copy_from_user(&user_cmd
, arg
, sizeof(struct comedi_cmd
))) {
1168 DPRINTK("bad cmd address\n");
1171 /* save user's chanlist pointer so it can be restored later */
1172 chanlist_saver
= user_cmd
.chanlist
;
1174 if (user_cmd
.subdev
>= dev
->n_subdevices
) {
1175 DPRINTK("%d no such subdevice\n", user_cmd
.subdev
);
1179 s
= dev
->subdevices
+ user_cmd
.subdev
;
1180 if (s
->type
== COMEDI_SUBD_UNUSED
) {
1181 DPRINTK("%d not valid subdevice\n", user_cmd
.subdev
);
1185 if (!s
->do_cmd
|| !s
->do_cmdtest
) {
1186 DPRINTK("subdevice %i does not support commands\n",
1191 /* make sure channel/gain list isn't too long */
1192 if (user_cmd
.chanlist_len
> s
->len_chanlist
) {
1193 DPRINTK("channel/gain list too long %d > %d\n",
1194 user_cmd
.chanlist_len
, s
->len_chanlist
);
1199 /* load channel/gain list */
1200 if (user_cmd
.chanlist
) {
1202 kmalloc(user_cmd
.chanlist_len
* sizeof(int), GFP_KERNEL
);
1204 DPRINTK("allocation failed\n");
1209 if (copy_from_user(chanlist
, user_cmd
.chanlist
,
1210 user_cmd
.chanlist_len
* sizeof(int))) {
1211 DPRINTK("fault reading chanlist\n");
1216 /* make sure each element in channel/gain list is valid */
1217 ret
= comedi_check_chanlist(s
, user_cmd
.chanlist_len
, chanlist
);
1219 DPRINTK("bad chanlist\n");
1223 user_cmd
.chanlist
= chanlist
;
1226 ret
= s
->do_cmdtest(dev
, s
, &user_cmd
);
1228 /* restore chanlist pointer before copying back */
1229 user_cmd
.chanlist
= chanlist_saver
;
1231 if (copy_to_user(arg
, &user_cmd
, sizeof(struct comedi_cmd
))) {
1232 DPRINTK("bad cmd address\n");
1257 static int do_lock_ioctl(struct comedi_device
*dev
, unsigned int arg
,
1261 unsigned long flags
;
1262 struct comedi_subdevice
*s
;
1264 if (arg
>= dev
->n_subdevices
)
1266 s
= dev
->subdevices
+ arg
;
1268 spin_lock_irqsave(&s
->spin_lock
, flags
);
1269 if (s
->busy
|| s
->lock
)
1273 spin_unlock_irqrestore(&s
->spin_lock
, flags
);
1280 ret
= s
->lock_f(dev
, s
);
1299 This function isn't protected by the semaphore, since
1300 we already own the lock.
1302 static int do_unlock_ioctl(struct comedi_device
*dev
, unsigned int arg
,
1305 struct comedi_subdevice
*s
;
1307 if (arg
>= dev
->n_subdevices
)
1309 s
= dev
->subdevices
+ arg
;
1314 if (s
->lock
&& s
->lock
!= file
)
1317 if (s
->lock
== file
) {
1331 cancel acquisition ioctl
1343 static int do_cancel_ioctl(struct comedi_device
*dev
, unsigned int arg
,
1346 struct comedi_subdevice
*s
;
1348 if (arg
>= dev
->n_subdevices
)
1350 s
= dev
->subdevices
+ arg
;
1351 if (s
->async
== NULL
)
1354 if (s
->lock
&& s
->lock
!= file
)
1360 if (s
->busy
!= file
)
1363 return do_cancel(dev
, s
);
1368 instructs driver to synchronize buffers
1380 static int do_poll_ioctl(struct comedi_device
*dev
, unsigned int arg
,
1383 struct comedi_subdevice
*s
;
1385 if (arg
>= dev
->n_subdevices
)
1387 s
= dev
->subdevices
+ arg
;
1389 if (s
->lock
&& s
->lock
!= file
)
1395 if (s
->busy
!= file
)
1399 return s
->poll(dev
, s
);
1404 static int do_cancel(struct comedi_device
*dev
, struct comedi_subdevice
*s
)
1408 if ((comedi_get_subdevice_runflags(s
) & SRF_RUNNING
) && s
->cancel
)
1409 ret
= s
->cancel(dev
, s
);
1411 do_become_nonbusy(dev
, s
);
1416 static void comedi_unmap(struct vm_area_struct
*area
)
1418 struct comedi_async
*async
;
1419 struct comedi_device
*dev
;
1421 async
= area
->vm_private_data
;
1422 dev
= async
->subdevice
->device
;
1424 mutex_lock(&dev
->mutex
);
1425 async
->mmap_count
--;
1426 mutex_unlock(&dev
->mutex
);
1429 static struct vm_operations_struct comedi_vm_ops
= {
1430 .close
= comedi_unmap
,
1433 static int comedi_mmap(struct file
*file
, struct vm_area_struct
*vma
)
1435 const unsigned minor
= iminor(file
->f_dentry
->d_inode
);
1436 struct comedi_device_file_info
*dev_file_info
=
1437 comedi_get_device_file_info(minor
);
1438 struct comedi_device
*dev
= dev_file_info
->device
;
1439 struct comedi_async
*async
= NULL
;
1440 unsigned long start
= vma
->vm_start
;
1445 struct comedi_subdevice
*s
;
1447 mutex_lock(&dev
->mutex
);
1448 if (!dev
->attached
) {
1449 DPRINTK("no driver configured on comedi%i\n", dev
->minor
);
1453 if (vma
->vm_flags
& VM_WRITE
)
1454 s
= comedi_get_write_subdevice(dev_file_info
);
1456 s
= comedi_get_read_subdevice(dev_file_info
);
1463 if (async
== NULL
) {
1468 if (vma
->vm_pgoff
!= 0) {
1469 DPRINTK("comedi: mmap() offset must be 0.\n");
1474 size
= vma
->vm_end
- vma
->vm_start
;
1475 if (size
> async
->prealloc_bufsz
) {
1479 if (size
& (~PAGE_MASK
)) {
1484 n_pages
= size
>> PAGE_SHIFT
;
1485 for (i
= 0; i
< n_pages
; ++i
) {
1486 if (remap_pfn_range(vma
, start
,
1487 page_to_pfn(virt_to_page
1488 (async
->buf_page_list
1489 [i
].virt_addr
)), PAGE_SIZE
,
1497 vma
->vm_ops
= &comedi_vm_ops
;
1498 vma
->vm_private_data
= async
;
1500 async
->mmap_count
++;
1504 mutex_unlock(&dev
->mutex
);
1508 static unsigned int comedi_poll(struct file
*file
, poll_table
* wait
)
1510 unsigned int mask
= 0;
1511 const unsigned minor
= iminor(file
->f_dentry
->d_inode
);
1512 struct comedi_device_file_info
*dev_file_info
=
1513 comedi_get_device_file_info(minor
);
1514 struct comedi_device
*dev
= dev_file_info
->device
;
1515 struct comedi_subdevice
*read_subdev
;
1516 struct comedi_subdevice
*write_subdev
;
1518 mutex_lock(&dev
->mutex
);
1519 if (!dev
->attached
) {
1520 DPRINTK("no driver configured on comedi%i\n", dev
->minor
);
1521 mutex_unlock(&dev
->mutex
);
1526 read_subdev
= comedi_get_read_subdevice(dev_file_info
);
1528 poll_wait(file
, &read_subdev
->async
->wait_head
, wait
);
1529 if (!read_subdev
->busy
1530 || comedi_buf_read_n_available(read_subdev
->async
) > 0
1531 || !(comedi_get_subdevice_runflags(read_subdev
) &
1533 mask
|= POLLIN
| POLLRDNORM
;
1536 write_subdev
= comedi_get_write_subdevice(dev_file_info
);
1538 poll_wait(file
, &write_subdev
->async
->wait_head
, wait
);
1539 comedi_buf_write_alloc(write_subdev
->async
,
1540 write_subdev
->async
->prealloc_bufsz
);
1541 if (!write_subdev
->busy
1542 || !(comedi_get_subdevice_runflags(write_subdev
) &
1544 || comedi_buf_write_n_allocated(write_subdev
->async
) >=
1545 bytes_per_sample(write_subdev
->async
->subdevice
)) {
1546 mask
|= POLLOUT
| POLLWRNORM
;
1550 mutex_unlock(&dev
->mutex
);
1554 static ssize_t
comedi_write(struct file
*file
, const char __user
*buf
,
1555 size_t nbytes
, loff_t
*offset
)
1557 struct comedi_subdevice
*s
;
1558 struct comedi_async
*async
;
1559 int n
, m
, count
= 0, retval
= 0;
1560 DECLARE_WAITQUEUE(wait
, current
);
1561 const unsigned minor
= iminor(file
->f_dentry
->d_inode
);
1562 struct comedi_device_file_info
*dev_file_info
=
1563 comedi_get_device_file_info(minor
);
1564 struct comedi_device
*dev
= dev_file_info
->device
;
1566 if (!dev
->attached
) {
1567 DPRINTK("no driver configured on comedi%i\n", dev
->minor
);
1572 s
= comedi_get_write_subdevice(dev_file_info
);
1587 if (s
->busy
!= file
) {
1591 add_wait_queue(&async
->wait_head
, &wait
);
1592 while (nbytes
> 0 && !retval
) {
1593 set_current_state(TASK_INTERRUPTIBLE
);
1595 if (!(comedi_get_subdevice_runflags(s
) & SRF_RUNNING
)) {
1597 if (comedi_get_subdevice_runflags(s
) &
1603 do_become_nonbusy(dev
, s
);
1611 if (async
->buf_write_ptr
+ m
> async
->prealloc_bufsz
)
1612 m
= async
->prealloc_bufsz
- async
->buf_write_ptr
;
1613 comedi_buf_write_alloc(async
, async
->prealloc_bufsz
);
1614 if (m
> comedi_buf_write_n_allocated(async
))
1615 m
= comedi_buf_write_n_allocated(async
);
1620 if (file
->f_flags
& O_NONBLOCK
) {
1624 if (signal_pending(current
)) {
1625 retval
= -ERESTARTSYS
;
1631 if (s
->busy
!= file
) {
1638 m
= copy_from_user(async
->prealloc_buf
+ async
->buf_write_ptr
,
1644 comedi_buf_write_free(async
, n
);
1650 break; /* makes device work like a pipe */
1652 set_current_state(TASK_RUNNING
);
1653 remove_wait_queue(&async
->wait_head
, &wait
);
1656 return count
? count
: retval
;
1659 static ssize_t
comedi_read(struct file
*file
, char __user
*buf
, size_t nbytes
,
1662 struct comedi_subdevice
*s
;
1663 struct comedi_async
*async
;
1664 int n
, m
, count
= 0, retval
= 0;
1665 DECLARE_WAITQUEUE(wait
, current
);
1666 const unsigned minor
= iminor(file
->f_dentry
->d_inode
);
1667 struct comedi_device_file_info
*dev_file_info
=
1668 comedi_get_device_file_info(minor
);
1669 struct comedi_device
*dev
= dev_file_info
->device
;
1671 if (!dev
->attached
) {
1672 DPRINTK("no driver configured on comedi%i\n", dev
->minor
);
1677 s
= comedi_get_read_subdevice(dev_file_info
);
1691 if (s
->busy
!= file
) {
1696 add_wait_queue(&async
->wait_head
, &wait
);
1697 while (nbytes
> 0 && !retval
) {
1698 set_current_state(TASK_INTERRUPTIBLE
);
1702 m
= comedi_buf_read_n_available(async
);
1703 /* printk("%d available\n",m); */
1704 if (async
->buf_read_ptr
+ m
> async
->prealloc_bufsz
)
1705 m
= async
->prealloc_bufsz
- async
->buf_read_ptr
;
1706 /* printk("%d contiguous\n",m); */
1711 if (!(comedi_get_subdevice_runflags(s
) & SRF_RUNNING
)) {
1712 do_become_nonbusy(dev
, s
);
1713 if (comedi_get_subdevice_runflags(s
) &
1721 if (file
->f_flags
& O_NONBLOCK
) {
1725 if (signal_pending(current
)) {
1726 retval
= -ERESTARTSYS
;
1734 if (s
->busy
!= file
) {
1740 m
= copy_to_user(buf
, async
->prealloc_buf
+
1741 async
->buf_read_ptr
, n
);
1747 comedi_buf_read_alloc(async
, n
);
1748 comedi_buf_read_free(async
, n
);
1754 break; /* makes device work like a pipe */
1756 if (!(comedi_get_subdevice_runflags(s
) & (SRF_ERROR
| SRF_RUNNING
)) &&
1757 async
->buf_read_count
- async
->buf_write_count
== 0) {
1758 do_become_nonbusy(dev
, s
);
1760 set_current_state(TASK_RUNNING
);
1761 remove_wait_queue(&async
->wait_head
, &wait
);
1764 return count
? count
: retval
;
1768 This function restores a subdevice to an idle state.
1770 void do_become_nonbusy(struct comedi_device
*dev
, struct comedi_subdevice
*s
)
1772 struct comedi_async
*async
= s
->async
;
1774 comedi_set_subdevice_runflags(s
, SRF_RUNNING
, 0);
1776 comedi_reset_async_buf(async
);
1777 async
->inttrig
= NULL
;
1780 "BUG: (?) do_become_nonbusy called with async=0\n");
1786 static int comedi_open(struct inode
*inode
, struct file
*file
)
1788 const unsigned minor
= iminor(inode
);
1789 struct comedi_device_file_info
*dev_file_info
=
1790 comedi_get_device_file_info(minor
);
1791 struct comedi_device
*dev
=
1792 dev_file_info
? dev_file_info
->device
: NULL
;
1795 DPRINTK("invalid minor number\n");
1799 /* This is slightly hacky, but we want module autoloading
1801 * case: user opens device, attached -> ok
1802 * case: user opens device, unattached, in_request_module=0 -> autoload
1803 * case: user opens device, unattached, in_request_module=1 -> fail
1804 * case: root opens device, attached -> ok
1805 * case: root opens device, unattached, in_request_module=1 -> ok
1806 * (typically called from modprobe)
1807 * case: root opens device, unattached, in_request_module=0 -> autoload
1809 * The last could be changed to "-> ok", which would deny root
1812 mutex_lock(&dev
->mutex
);
1815 if (!capable(CAP_NET_ADMIN
) && dev
->in_request_module
) {
1816 DPRINTK("in request module\n");
1817 mutex_unlock(&dev
->mutex
);
1820 if (capable(CAP_NET_ADMIN
) && dev
->in_request_module
)
1823 dev
->in_request_module
= 1;
1826 mutex_unlock(&dev
->mutex
);
1827 request_module("char-major-%i-%i", COMEDI_MAJOR
, dev
->minor
);
1828 mutex_lock(&dev
->mutex
);
1831 dev
->in_request_module
= 0;
1833 if (!dev
->attached
&& !capable(CAP_NET_ADMIN
)) {
1834 DPRINTK("not attached and not CAP_NET_ADMIN\n");
1835 mutex_unlock(&dev
->mutex
);
1839 __module_get(THIS_MODULE
);
1841 if (dev
->attached
) {
1842 if (!try_module_get(dev
->driver
->module
)) {
1843 module_put(THIS_MODULE
);
1844 mutex_unlock(&dev
->mutex
);
1849 if (dev
->attached
&& dev
->use_count
== 0 && dev
->open
) {
1850 int rc
= dev
->open(dev
);
1852 module_put(dev
->driver
->module
);
1853 module_put(THIS_MODULE
);
1854 mutex_unlock(&dev
->mutex
);
1861 mutex_unlock(&dev
->mutex
);
1866 static int comedi_close(struct inode
*inode
, struct file
*file
)
1868 const unsigned minor
= iminor(inode
);
1869 struct comedi_device_file_info
*dev_file_info
=
1870 comedi_get_device_file_info(minor
);
1871 struct comedi_device
*dev
= dev_file_info
->device
;
1872 struct comedi_subdevice
*s
= NULL
;
1875 mutex_lock(&dev
->mutex
);
1877 if (dev
->subdevices
) {
1878 for (i
= 0; i
< dev
->n_subdevices
; i
++) {
1879 s
= dev
->subdevices
+ i
;
1881 if (s
->busy
== file
)
1883 if (s
->lock
== file
)
1887 if (dev
->attached
&& dev
->use_count
== 1 && dev
->close
)
1890 module_put(THIS_MODULE
);
1892 module_put(dev
->driver
->module
);
1896 mutex_unlock(&dev
->mutex
);
1898 if (file
->f_flags
& FASYNC
)
1899 comedi_fasync(-1, file
, 0);
1904 static int comedi_fasync(int fd
, struct file
*file
, int on
)
1906 const unsigned minor
= iminor(file
->f_dentry
->d_inode
);
1907 struct comedi_device_file_info
*dev_file_info
=
1908 comedi_get_device_file_info(minor
);
1910 struct comedi_device
*dev
= dev_file_info
->device
;
1912 return fasync_helper(fd
, file
, on
, &dev
->async_queue
);
1915 const struct file_operations comedi_fops
= {
1916 .owner
= THIS_MODULE
,
1917 .unlocked_ioctl
= comedi_unlocked_ioctl
,
1918 .compat_ioctl
= comedi_compat_ioctl
,
1919 .open
= comedi_open
,
1920 .release
= comedi_close
,
1921 .read
= comedi_read
,
1922 .write
= comedi_write
,
1923 .mmap
= comedi_mmap
,
1924 .poll
= comedi_poll
,
1925 .fasync
= comedi_fasync
,
1926 .llseek
= noop_llseek
,
1929 struct class *comedi_class
;
1930 static struct cdev comedi_cdev
;
1932 static void comedi_cleanup_legacy_minors(void)
1936 for (i
= 0; i
< comedi_num_legacy_minors
; i
++)
1937 comedi_free_board_minor(i
);
1940 static int __init
comedi_init(void)
1945 printk(KERN_INFO
"comedi: version " COMEDI_RELEASE
1946 " - http://www.comedi.org\n");
1948 if (comedi_num_legacy_minors
< 0 ||
1949 comedi_num_legacy_minors
> COMEDI_NUM_BOARD_MINORS
) {
1950 printk(KERN_ERR
"comedi: error: invalid value for module "
1951 "parameter \"comedi_num_legacy_minors\". Valid values "
1952 "are 0 through %i.\n", COMEDI_NUM_BOARD_MINORS
);
1957 * comedi is unusable if both comedi_autoconfig and
1958 * comedi_num_legacy_minors are zero, so we might as well adjust the
1959 * defaults in that case
1961 if (comedi_autoconfig
== 0 && comedi_num_legacy_minors
== 0)
1962 comedi_num_legacy_minors
= 16;
1964 memset(comedi_file_info_table
, 0,
1965 sizeof(struct comedi_device_file_info
*) * COMEDI_NUM_MINORS
);
1967 retval
= register_chrdev_region(MKDEV(COMEDI_MAJOR
, 0),
1968 COMEDI_NUM_MINORS
, "comedi");
1971 cdev_init(&comedi_cdev
, &comedi_fops
);
1972 comedi_cdev
.owner
= THIS_MODULE
;
1973 kobject_set_name(&comedi_cdev
.kobj
, "comedi");
1974 if (cdev_add(&comedi_cdev
, MKDEV(COMEDI_MAJOR
, 0), COMEDI_NUM_MINORS
)) {
1975 unregister_chrdev_region(MKDEV(COMEDI_MAJOR
, 0),
1979 comedi_class
= class_create(THIS_MODULE
, "comedi");
1980 if (IS_ERR(comedi_class
)) {
1981 printk(KERN_ERR
"comedi: failed to create class");
1982 cdev_del(&comedi_cdev
);
1983 unregister_chrdev_region(MKDEV(COMEDI_MAJOR
, 0),
1985 return PTR_ERR(comedi_class
);
1988 /* XXX requires /proc interface */
1991 /* create devices files for legacy/manual use */
1992 for (i
= 0; i
< comedi_num_legacy_minors
; i
++) {
1994 minor
= comedi_alloc_board_minor(NULL
);
1996 comedi_cleanup_legacy_minors();
1997 cdev_del(&comedi_cdev
);
1998 unregister_chrdev_region(MKDEV(COMEDI_MAJOR
, 0),
2007 static void __exit
comedi_cleanup(void)
2011 comedi_cleanup_legacy_minors();
2012 for (i
= 0; i
< COMEDI_NUM_MINORS
; ++i
)
2013 BUG_ON(comedi_file_info_table
[i
]);
2015 class_destroy(comedi_class
);
2016 cdev_del(&comedi_cdev
);
2017 unregister_chrdev_region(MKDEV(COMEDI_MAJOR
, 0), COMEDI_NUM_MINORS
);
2019 comedi_proc_cleanup();
2022 module_init(comedi_init
);
2023 module_exit(comedi_cleanup
);
2025 void comedi_error(const struct comedi_device
*dev
, const char *s
)
2027 printk(KERN_ERR
"comedi%d: %s: %s\n", dev
->minor
,
2028 dev
->driver
->driver_name
, s
);
2030 EXPORT_SYMBOL(comedi_error
);
2032 void comedi_event(struct comedi_device
*dev
, struct comedi_subdevice
*s
)
2034 struct comedi_async
*async
= s
->async
;
2035 unsigned runflags
= 0;
2036 unsigned runflags_mask
= 0;
2038 /* DPRINTK("comedi_event 0x%x\n",mask); */
2040 if ((comedi_get_subdevice_runflags(s
) & SRF_RUNNING
) == 0)
2044 async
->events
& (COMEDI_CB_EOA
| COMEDI_CB_ERROR
|
2045 COMEDI_CB_OVERFLOW
)) {
2046 runflags_mask
|= SRF_RUNNING
;
2048 /* remember if an error event has occured, so an error
2049 * can be returned the next time the user does a read() */
2050 if (s
->async
->events
& (COMEDI_CB_ERROR
| COMEDI_CB_OVERFLOW
)) {
2051 runflags_mask
|= SRF_ERROR
;
2052 runflags
|= SRF_ERROR
;
2054 if (runflags_mask
) {
2055 /*sets SRF_ERROR and SRF_RUNNING together atomically */
2056 comedi_set_subdevice_runflags(s
, runflags_mask
, runflags
);
2059 if (async
->cb_mask
& s
->async
->events
) {
2060 if (comedi_get_subdevice_runflags(s
) & SRF_USER
) {
2061 wake_up_interruptible(&async
->wait_head
);
2062 if (s
->subdev_flags
& SDF_CMD_READ
)
2063 kill_fasync(&dev
->async_queue
, SIGIO
, POLL_IN
);
2064 if (s
->subdev_flags
& SDF_CMD_WRITE
)
2065 kill_fasync(&dev
->async_queue
, SIGIO
, POLL_OUT
);
2068 async
->cb_func(s
->async
->events
, async
->cb_arg
);
2071 s
->async
->events
= 0;
2073 EXPORT_SYMBOL(comedi_event
);
2075 unsigned comedi_get_subdevice_runflags(struct comedi_subdevice
*s
)
2077 unsigned long flags
;
2080 spin_lock_irqsave(&s
->spin_lock
, flags
);
2081 runflags
= s
->runflags
;
2082 spin_unlock_irqrestore(&s
->spin_lock
, flags
);
2085 EXPORT_SYMBOL(comedi_get_subdevice_runflags
);
2087 static int is_device_busy(struct comedi_device
*dev
)
2089 struct comedi_subdevice
*s
;
2095 for (i
= 0; i
< dev
->n_subdevices
; i
++) {
2096 s
= dev
->subdevices
+ i
;
2099 if (s
->async
&& s
->async
->mmap_count
)
2106 static void comedi_device_init(struct comedi_device
*dev
)
2108 memset(dev
, 0, sizeof(struct comedi_device
));
2109 spin_lock_init(&dev
->spinlock
);
2110 mutex_init(&dev
->mutex
);
2114 static void comedi_device_cleanup(struct comedi_device
*dev
)
2118 mutex_lock(&dev
->mutex
);
2119 comedi_device_detach(dev
);
2120 mutex_unlock(&dev
->mutex
);
2121 mutex_destroy(&dev
->mutex
);
2124 int comedi_alloc_board_minor(struct device
*hardware_device
)
2126 unsigned long flags
;
2127 struct comedi_device_file_info
*info
;
2128 struct device
*csdev
;
2132 info
= kzalloc(sizeof(struct comedi_device_file_info
), GFP_KERNEL
);
2135 info
->device
= kzalloc(sizeof(struct comedi_device
), GFP_KERNEL
);
2136 if (info
->device
== NULL
) {
2140 comedi_device_init(info
->device
);
2141 spin_lock_irqsave(&comedi_file_info_table_lock
, flags
);
2142 for (i
= 0; i
< COMEDI_NUM_BOARD_MINORS
; ++i
) {
2143 if (comedi_file_info_table
[i
] == NULL
) {
2144 comedi_file_info_table
[i
] = info
;
2148 spin_unlock_irqrestore(&comedi_file_info_table_lock
, flags
);
2149 if (i
== COMEDI_NUM_BOARD_MINORS
) {
2150 comedi_device_cleanup(info
->device
);
2151 kfree(info
->device
);
2155 "ran out of minor numbers for board device files.\n");
2158 info
->device
->minor
= i
;
2159 csdev
= COMEDI_DEVICE_CREATE(comedi_class
, NULL
,
2160 MKDEV(COMEDI_MAJOR
, i
), NULL
,
2161 hardware_device
, "comedi%i", i
);
2163 info
->device
->class_dev
= csdev
;
2164 dev_set_drvdata(csdev
, info
);
2165 retval
= device_create_file(csdev
, &dev_attr_max_read_buffer_kb
);
2169 "failed to create sysfs attribute file \"%s\".\n",
2170 dev_attr_max_read_buffer_kb
.attr
.name
);
2171 comedi_free_board_minor(i
);
2174 retval
= device_create_file(csdev
, &dev_attr_read_buffer_kb
);
2178 "failed to create sysfs attribute file \"%s\".\n",
2179 dev_attr_read_buffer_kb
.attr
.name
);
2180 comedi_free_board_minor(i
);
2183 retval
= device_create_file(csdev
, &dev_attr_max_write_buffer_kb
);
2187 "failed to create sysfs attribute file \"%s\".\n",
2188 dev_attr_max_write_buffer_kb
.attr
.name
);
2189 comedi_free_board_minor(i
);
2192 retval
= device_create_file(csdev
, &dev_attr_write_buffer_kb
);
2196 "failed to create sysfs attribute file \"%s\".\n",
2197 dev_attr_write_buffer_kb
.attr
.name
);
2198 comedi_free_board_minor(i
);
2204 void comedi_free_board_minor(unsigned minor
)
2206 unsigned long flags
;
2207 struct comedi_device_file_info
*info
;
2209 BUG_ON(minor
>= COMEDI_NUM_BOARD_MINORS
);
2210 spin_lock_irqsave(&comedi_file_info_table_lock
, flags
);
2211 info
= comedi_file_info_table
[minor
];
2212 comedi_file_info_table
[minor
] = NULL
;
2213 spin_unlock_irqrestore(&comedi_file_info_table_lock
, flags
);
2216 struct comedi_device
*dev
= info
->device
;
2218 if (dev
->class_dev
) {
2219 device_destroy(comedi_class
,
2220 MKDEV(COMEDI_MAJOR
, dev
->minor
));
2222 comedi_device_cleanup(dev
);
2229 int comedi_alloc_subdevice_minor(struct comedi_device
*dev
,
2230 struct comedi_subdevice
*s
)
2232 unsigned long flags
;
2233 struct comedi_device_file_info
*info
;
2234 struct device
*csdev
;
2238 info
= kmalloc(sizeof(struct comedi_device_file_info
), GFP_KERNEL
);
2242 info
->read_subdevice
= s
;
2243 info
->write_subdevice
= s
;
2244 spin_lock_irqsave(&comedi_file_info_table_lock
, flags
);
2245 for (i
= COMEDI_FIRST_SUBDEVICE_MINOR
; i
< COMEDI_NUM_MINORS
; ++i
) {
2246 if (comedi_file_info_table
[i
] == NULL
) {
2247 comedi_file_info_table
[i
] = info
;
2251 spin_unlock_irqrestore(&comedi_file_info_table_lock
, flags
);
2252 if (i
== COMEDI_NUM_MINORS
) {
2256 "ran out of minor numbers for board device files.\n");
2260 csdev
= COMEDI_DEVICE_CREATE(comedi_class
, dev
->class_dev
,
2261 MKDEV(COMEDI_MAJOR
, i
), NULL
, NULL
,
2262 "comedi%i_subd%i", dev
->minor
,
2263 (int)(s
- dev
->subdevices
));
2265 s
->class_dev
= csdev
;
2266 dev_set_drvdata(csdev
, info
);
2267 retval
= device_create_file(csdev
, &dev_attr_max_read_buffer_kb
);
2271 "failed to create sysfs attribute file \"%s\".\n",
2272 dev_attr_max_read_buffer_kb
.attr
.name
);
2273 comedi_free_subdevice_minor(s
);
2276 retval
= device_create_file(csdev
, &dev_attr_read_buffer_kb
);
2280 "failed to create sysfs attribute file \"%s\".\n",
2281 dev_attr_read_buffer_kb
.attr
.name
);
2282 comedi_free_subdevice_minor(s
);
2285 retval
= device_create_file(csdev
, &dev_attr_max_write_buffer_kb
);
2289 "failed to create sysfs attribute file \"%s\".\n",
2290 dev_attr_max_write_buffer_kb
.attr
.name
);
2291 comedi_free_subdevice_minor(s
);
2294 retval
= device_create_file(csdev
, &dev_attr_write_buffer_kb
);
2298 "failed to create sysfs attribute file \"%s\".\n",
2299 dev_attr_write_buffer_kb
.attr
.name
);
2300 comedi_free_subdevice_minor(s
);
2306 void comedi_free_subdevice_minor(struct comedi_subdevice
*s
)
2308 unsigned long flags
;
2309 struct comedi_device_file_info
*info
;
2316 BUG_ON(s
->minor
>= COMEDI_NUM_MINORS
);
2317 BUG_ON(s
->minor
< COMEDI_FIRST_SUBDEVICE_MINOR
);
2319 spin_lock_irqsave(&comedi_file_info_table_lock
, flags
);
2320 info
= comedi_file_info_table
[s
->minor
];
2321 comedi_file_info_table
[s
->minor
] = NULL
;
2322 spin_unlock_irqrestore(&comedi_file_info_table_lock
, flags
);
2325 device_destroy(comedi_class
, MKDEV(COMEDI_MAJOR
, s
->minor
));
2326 s
->class_dev
= NULL
;
2331 struct comedi_device_file_info
*comedi_get_device_file_info(unsigned minor
)
2333 unsigned long flags
;
2334 struct comedi_device_file_info
*info
;
2336 BUG_ON(minor
>= COMEDI_NUM_MINORS
);
2337 spin_lock_irqsave(&comedi_file_info_table_lock
, flags
);
2338 info
= comedi_file_info_table
[minor
];
2339 spin_unlock_irqrestore(&comedi_file_info_table_lock
, flags
);
2342 EXPORT_SYMBOL_GPL(comedi_get_device_file_info
);
2344 static int resize_async_buffer(struct comedi_device
*dev
,
2345 struct comedi_subdevice
*s
,
2346 struct comedi_async
*async
, unsigned new_size
)
2350 if (new_size
> async
->max_bufsize
)
2354 DPRINTK("subdevice is busy, cannot resize buffer\n");
2357 if (async
->mmap_count
) {
2358 DPRINTK("subdevice is mmapped, cannot resize buffer\n");
2362 if (!async
->prealloc_buf
)
2365 /* make sure buffer is an integral number of pages
2367 new_size
= (new_size
+ PAGE_SIZE
- 1) & PAGE_MASK
;
2369 retval
= comedi_buf_alloc(dev
, s
, new_size
);
2373 if (s
->buf_change
) {
2374 retval
= s
->buf_change(dev
, s
, new_size
);
2379 DPRINTK("comedi%i subd %d buffer resized to %i bytes\n",
2380 dev
->minor
, (int)(s
- dev
->subdevices
), async
->prealloc_bufsz
);
2384 /* sysfs attribute files */
2386 static const unsigned bytes_per_kibi
= 1024;
2388 static ssize_t
show_max_read_buffer_kb(struct device
*dev
,
2389 struct device_attribute
*attr
, char *buf
)
2392 struct comedi_device_file_info
*info
= dev_get_drvdata(dev
);
2393 unsigned max_buffer_size_kb
= 0;
2394 struct comedi_subdevice
*const read_subdevice
=
2395 comedi_get_read_subdevice(info
);
2397 mutex_lock(&info
->device
->mutex
);
2398 if (read_subdevice
&&
2399 (read_subdevice
->subdev_flags
& SDF_CMD_READ
) &&
2400 read_subdevice
->async
) {
2401 max_buffer_size_kb
= read_subdevice
->async
->max_bufsize
/
2404 retval
= snprintf(buf
, PAGE_SIZE
, "%i\n", max_buffer_size_kb
);
2405 mutex_unlock(&info
->device
->mutex
);
2410 static ssize_t
store_max_read_buffer_kb(struct device
*dev
,
2411 struct device_attribute
*attr
,
2412 const char *buf
, size_t count
)
2414 struct comedi_device_file_info
*info
= dev_get_drvdata(dev
);
2415 unsigned long new_max_size_kb
;
2416 uint64_t new_max_size
;
2417 struct comedi_subdevice
*const read_subdevice
=
2418 comedi_get_read_subdevice(info
);
2420 if (strict_strtoul(buf
, 10, &new_max_size_kb
))
2422 if (new_max_size_kb
!= (uint32_t) new_max_size_kb
)
2424 new_max_size
= ((uint64_t) new_max_size_kb
) * bytes_per_kibi
;
2425 if (new_max_size
!= (uint32_t) new_max_size
)
2428 mutex_lock(&info
->device
->mutex
);
2429 if (read_subdevice
== NULL
||
2430 (read_subdevice
->subdev_flags
& SDF_CMD_READ
) == 0 ||
2431 read_subdevice
->async
== NULL
) {
2432 mutex_unlock(&info
->device
->mutex
);
2435 read_subdevice
->async
->max_bufsize
= new_max_size
;
2436 mutex_unlock(&info
->device
->mutex
);
2441 static struct device_attribute dev_attr_max_read_buffer_kb
= {
2443 .name
= "max_read_buffer_kb",
2444 .mode
= S_IRUGO
| S_IWUSR
},
2445 .show
= &show_max_read_buffer_kb
,
2446 .store
= &store_max_read_buffer_kb
2449 static ssize_t
show_read_buffer_kb(struct device
*dev
,
2450 struct device_attribute
*attr
, char *buf
)
2453 struct comedi_device_file_info
*info
= dev_get_drvdata(dev
);
2454 unsigned buffer_size_kb
= 0;
2455 struct comedi_subdevice
*const read_subdevice
=
2456 comedi_get_read_subdevice(info
);
2458 mutex_lock(&info
->device
->mutex
);
2459 if (read_subdevice
&&
2460 (read_subdevice
->subdev_flags
& SDF_CMD_READ
) &&
2461 read_subdevice
->async
) {
2462 buffer_size_kb
= read_subdevice
->async
->prealloc_bufsz
/
2465 retval
= snprintf(buf
, PAGE_SIZE
, "%i\n", buffer_size_kb
);
2466 mutex_unlock(&info
->device
->mutex
);
2471 static ssize_t
store_read_buffer_kb(struct device
*dev
,
2472 struct device_attribute
*attr
,
2473 const char *buf
, size_t count
)
2475 struct comedi_device_file_info
*info
= dev_get_drvdata(dev
);
2476 unsigned long new_size_kb
;
2479 struct comedi_subdevice
*const read_subdevice
=
2480 comedi_get_read_subdevice(info
);
2482 if (strict_strtoul(buf
, 10, &new_size_kb
))
2484 if (new_size_kb
!= (uint32_t) new_size_kb
)
2486 new_size
= ((uint64_t) new_size_kb
) * bytes_per_kibi
;
2487 if (new_size
!= (uint32_t) new_size
)
2490 mutex_lock(&info
->device
->mutex
);
2491 if (read_subdevice
== NULL
||
2492 (read_subdevice
->subdev_flags
& SDF_CMD_READ
) == 0 ||
2493 read_subdevice
->async
== NULL
) {
2494 mutex_unlock(&info
->device
->mutex
);
2497 retval
= resize_async_buffer(info
->device
, read_subdevice
,
2498 read_subdevice
->async
, new_size
);
2499 mutex_unlock(&info
->device
->mutex
);
2506 static struct device_attribute dev_attr_read_buffer_kb
= {
2508 .name
= "read_buffer_kb",
2509 .mode
= S_IRUGO
| S_IWUSR
| S_IWGRP
},
2510 .show
= &show_read_buffer_kb
,
2511 .store
= &store_read_buffer_kb
2514 static ssize_t
show_max_write_buffer_kb(struct device
*dev
,
2515 struct device_attribute
*attr
,
2519 struct comedi_device_file_info
*info
= dev_get_drvdata(dev
);
2520 unsigned max_buffer_size_kb
= 0;
2521 struct comedi_subdevice
*const write_subdevice
=
2522 comedi_get_write_subdevice(info
);
2524 mutex_lock(&info
->device
->mutex
);
2525 if (write_subdevice
&&
2526 (write_subdevice
->subdev_flags
& SDF_CMD_WRITE
) &&
2527 write_subdevice
->async
) {
2528 max_buffer_size_kb
= write_subdevice
->async
->max_bufsize
/
2531 retval
= snprintf(buf
, PAGE_SIZE
, "%i\n", max_buffer_size_kb
);
2532 mutex_unlock(&info
->device
->mutex
);
2537 static ssize_t
store_max_write_buffer_kb(struct device
*dev
,
2538 struct device_attribute
*attr
,
2539 const char *buf
, size_t count
)
2541 struct comedi_device_file_info
*info
= dev_get_drvdata(dev
);
2542 unsigned long new_max_size_kb
;
2543 uint64_t new_max_size
;
2544 struct comedi_subdevice
*const write_subdevice
=
2545 comedi_get_write_subdevice(info
);
2547 if (strict_strtoul(buf
, 10, &new_max_size_kb
))
2549 if (new_max_size_kb
!= (uint32_t) new_max_size_kb
)
2551 new_max_size
= ((uint64_t) new_max_size_kb
) * bytes_per_kibi
;
2552 if (new_max_size
!= (uint32_t) new_max_size
)
2555 mutex_lock(&info
->device
->mutex
);
2556 if (write_subdevice
== NULL
||
2557 (write_subdevice
->subdev_flags
& SDF_CMD_WRITE
) == 0 ||
2558 write_subdevice
->async
== NULL
) {
2559 mutex_unlock(&info
->device
->mutex
);
2562 write_subdevice
->async
->max_bufsize
= new_max_size
;
2563 mutex_unlock(&info
->device
->mutex
);
2568 static struct device_attribute dev_attr_max_write_buffer_kb
= {
2570 .name
= "max_write_buffer_kb",
2571 .mode
= S_IRUGO
| S_IWUSR
},
2572 .show
= &show_max_write_buffer_kb
,
2573 .store
= &store_max_write_buffer_kb
2576 static ssize_t
show_write_buffer_kb(struct device
*dev
,
2577 struct device_attribute
*attr
, char *buf
)
2580 struct comedi_device_file_info
*info
= dev_get_drvdata(dev
);
2581 unsigned buffer_size_kb
= 0;
2582 struct comedi_subdevice
*const write_subdevice
=
2583 comedi_get_write_subdevice(info
);
2585 mutex_lock(&info
->device
->mutex
);
2586 if (write_subdevice
&&
2587 (write_subdevice
->subdev_flags
& SDF_CMD_WRITE
) &&
2588 write_subdevice
->async
) {
2589 buffer_size_kb
= write_subdevice
->async
->prealloc_bufsz
/
2592 retval
= snprintf(buf
, PAGE_SIZE
, "%i\n", buffer_size_kb
);
2593 mutex_unlock(&info
->device
->mutex
);
2598 static ssize_t
store_write_buffer_kb(struct device
*dev
,
2599 struct device_attribute
*attr
,
2600 const char *buf
, size_t count
)
2602 struct comedi_device_file_info
*info
= dev_get_drvdata(dev
);
2603 unsigned long new_size_kb
;
2606 struct comedi_subdevice
*const write_subdevice
=
2607 comedi_get_write_subdevice(info
);
2609 if (strict_strtoul(buf
, 10, &new_size_kb
))
2611 if (new_size_kb
!= (uint32_t) new_size_kb
)
2613 new_size
= ((uint64_t) new_size_kb
) * bytes_per_kibi
;
2614 if (new_size
!= (uint32_t) new_size
)
2617 mutex_lock(&info
->device
->mutex
);
2618 if (write_subdevice
== NULL
||
2619 (write_subdevice
->subdev_flags
& SDF_CMD_WRITE
) == 0 ||
2620 write_subdevice
->async
== NULL
) {
2621 mutex_unlock(&info
->device
->mutex
);
2624 retval
= resize_async_buffer(info
->device
, write_subdevice
,
2625 write_subdevice
->async
, new_size
);
2626 mutex_unlock(&info
->device
->mutex
);
2633 static struct device_attribute dev_attr_write_buffer_kb
= {
2635 .name
= "write_buffer_kb",
2636 .mode
= S_IRUGO
| S_IWUSR
| S_IWGRP
},
2637 .show
= &show_write_buffer_kb
,
2638 .store
= &store_write_buffer_kb