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 put_user(x
, it
.rangelist
+ i
);
543 if (copy_to_user(it
.rangelist
, s
->range_type_list
,
544 s
->n_chan
* sizeof(unsigned int)))
554 buffer information ioctl
557 pointer to bufinfo structure
563 modified bufinfo at arg
566 static int do_bufinfo_ioctl(struct comedi_device
*dev
,
567 struct comedi_bufinfo __user
*arg
, void *file
)
569 struct comedi_bufinfo bi
;
570 struct comedi_subdevice
*s
;
571 struct comedi_async
*async
;
573 if (copy_from_user(&bi
, arg
, sizeof(struct comedi_bufinfo
)))
576 if (bi
.subdevice
>= dev
->n_subdevices
|| bi
.subdevice
< 0)
579 s
= dev
->subdevices
+ bi
.subdevice
;
581 if (s
->lock
&& s
->lock
!= file
)
587 DPRINTK("subdevice does not have async capability\n");
588 bi
.buf_write_ptr
= 0;
590 bi
.buf_write_count
= 0;
591 bi
.buf_read_count
= 0;
593 bi
.bytes_written
= 0;
598 bi
.bytes_written
= 0;
599 goto copyback_position
;
604 if (bi
.bytes_read
&& (s
->subdev_flags
& SDF_CMD_READ
)) {
605 bi
.bytes_read
= comedi_buf_read_alloc(async
, bi
.bytes_read
);
606 comedi_buf_read_free(async
, bi
.bytes_read
);
608 if (!(comedi_get_subdevice_runflags(s
) & (SRF_ERROR
|
610 && async
->buf_write_count
== async
->buf_read_count
) {
611 do_become_nonbusy(dev
, s
);
615 if (bi
.bytes_written
&& (s
->subdev_flags
& SDF_CMD_WRITE
)) {
617 comedi_buf_write_alloc(async
, bi
.bytes_written
);
618 comedi_buf_write_free(async
, bi
.bytes_written
);
622 bi
.buf_write_count
= async
->buf_write_count
;
623 bi
.buf_write_ptr
= async
->buf_write_ptr
;
624 bi
.buf_read_count
= async
->buf_read_count
;
625 bi
.buf_read_ptr
= async
->buf_read_ptr
;
628 if (copy_to_user(arg
, &bi
, sizeof(struct comedi_bufinfo
)))
634 static int parse_insn(struct comedi_device
*dev
, struct comedi_insn
*insn
,
635 unsigned int *data
, void *file
);
638 * synchronous instructions
641 * pointer to sync cmd structure
644 * sync cmd struct at arg
651 /* arbitrary limits */
652 #define MAX_SAMPLES 256
653 static int do_insnlist_ioctl(struct comedi_device
*dev
,
654 struct comedi_insnlist __user
*arg
, void *file
)
656 struct comedi_insnlist insnlist
;
657 struct comedi_insn
*insns
= NULL
;
658 unsigned int *data
= NULL
;
662 if (copy_from_user(&insnlist
, arg
, sizeof(struct comedi_insnlist
)))
665 data
= kmalloc(sizeof(unsigned int) * MAX_SAMPLES
, GFP_KERNEL
);
667 DPRINTK("kmalloc failed\n");
673 kmalloc(sizeof(struct comedi_insn
) * insnlist
.n_insns
, GFP_KERNEL
);
675 DPRINTK("kmalloc failed\n");
680 if (copy_from_user(insns
, insnlist
.insns
,
681 sizeof(struct comedi_insn
) * insnlist
.n_insns
)) {
682 DPRINTK("copy_from_user failed\n");
687 for (i
= 0; i
< insnlist
.n_insns
; i
++) {
688 if (insns
[i
].n
> MAX_SAMPLES
) {
689 DPRINTK("number of samples too large\n");
693 if (insns
[i
].insn
& INSN_MASK_WRITE
) {
694 if (copy_from_user(data
, insns
[i
].data
,
695 insns
[i
].n
* sizeof(unsigned int))) {
696 DPRINTK("copy_from_user failed\n");
701 ret
= parse_insn(dev
, insns
+ i
, data
, file
);
704 if (insns
[i
].insn
& INSN_MASK_READ
) {
705 if (copy_to_user(insns
[i
].data
, data
,
706 insns
[i
].n
* sizeof(unsigned int))) {
707 DPRINTK("copy_to_user failed\n");
725 static int check_insn_config_length(struct comedi_insn
*insn
,
732 case INSN_CONFIG_DIO_OUTPUT
:
733 case INSN_CONFIG_DIO_INPUT
:
734 case INSN_CONFIG_DISARM
:
735 case INSN_CONFIG_RESET
:
739 case INSN_CONFIG_ARM
:
740 case INSN_CONFIG_DIO_QUERY
:
741 case INSN_CONFIG_BLOCK_SIZE
:
742 case INSN_CONFIG_FILTER
:
743 case INSN_CONFIG_SERIAL_CLOCK
:
744 case INSN_CONFIG_BIDIRECTIONAL_DATA
:
745 case INSN_CONFIG_ALT_SOURCE
:
746 case INSN_CONFIG_SET_COUNTER_MODE
:
747 case INSN_CONFIG_8254_READ_STATUS
:
748 case INSN_CONFIG_SET_ROUTING
:
749 case INSN_CONFIG_GET_ROUTING
:
750 case INSN_CONFIG_GET_PWM_STATUS
:
751 case INSN_CONFIG_PWM_SET_PERIOD
:
752 case INSN_CONFIG_PWM_GET_PERIOD
:
756 case INSN_CONFIG_SET_GATE_SRC
:
757 case INSN_CONFIG_GET_GATE_SRC
:
758 case INSN_CONFIG_SET_CLOCK_SRC
:
759 case INSN_CONFIG_GET_CLOCK_SRC
:
760 case INSN_CONFIG_SET_OTHER_SRC
:
761 case INSN_CONFIG_GET_COUNTER_STATUS
:
762 case INSN_CONFIG_PWM_SET_H_BRIDGE
:
763 case INSN_CONFIG_PWM_GET_H_BRIDGE
:
764 case INSN_CONFIG_GET_HARDWARE_BUFFER_SIZE
:
768 case INSN_CONFIG_PWM_OUTPUT
:
769 case INSN_CONFIG_ANALOG_TRIG
:
773 /* by default we allow the insn since we don't have checks for
774 * all possible cases yet */
777 "comedi: no check for data length of config insn id "
778 "%i is implemented.\n"
779 " Add a check to %s in %s.\n"
780 " Assuming n=%i is correct.\n", data
[0], __func__
,
788 static int parse_insn(struct comedi_device
*dev
, struct comedi_insn
*insn
,
789 unsigned int *data
, void *file
)
791 struct comedi_subdevice
*s
;
795 if (insn
->insn
& INSN_MASK_SPECIAL
) {
796 /* a non-subdevice instruction */
798 switch (insn
->insn
) {
808 do_gettimeofday(&tv
);
810 data
[1] = tv
.tv_usec
;
816 if (insn
->n
!= 1 || data
[0] >= 100000) {
820 udelay(data
[0] / 1000);
828 if (insn
->subdev
>= dev
->n_subdevices
) {
829 DPRINTK("%d not usable subdevice\n",
834 s
= dev
->subdevices
+ insn
->subdev
;
836 DPRINTK("no async\n");
840 if (!s
->async
->inttrig
) {
841 DPRINTK("no inttrig\n");
845 ret
= s
->async
->inttrig(dev
, s
, insn
->data
[0]);
850 DPRINTK("invalid insn\n");
855 /* a subdevice instruction */
856 unsigned int maxdata
;
858 if (insn
->subdev
>= dev
->n_subdevices
) {
859 DPRINTK("subdevice %d out of range\n", insn
->subdev
);
863 s
= dev
->subdevices
+ insn
->subdev
;
865 if (s
->type
== COMEDI_SUBD_UNUSED
) {
866 DPRINTK("%d not usable subdevice\n", insn
->subdev
);
871 /* are we locked? (ioctl lock) */
872 if (s
->lock
&& s
->lock
!= file
) {
873 DPRINTK("device locked\n");
878 ret
= comedi_check_chanlist(s
, 1, &insn
->chanspec
);
881 DPRINTK("bad chanspec\n");
889 /* This looks arbitrary. It is. */
890 s
->busy
= &parse_insn
;
891 switch (insn
->insn
) {
893 ret
= s
->insn_read(dev
, s
, insn
, data
);
896 maxdata
= s
->maxdata_list
897 ? s
->maxdata_list
[CR_CHAN(insn
->chanspec
)]
899 for (i
= 0; i
< insn
->n
; ++i
) {
900 if (data
[i
] > maxdata
) {
902 DPRINTK("bad data value(s)\n");
907 ret
= s
->insn_write(dev
, s
, insn
, data
);
914 ret
= s
->insn_bits(dev
, s
, insn
, data
);
917 ret
= check_insn_config_length(insn
, data
);
920 ret
= s
->insn_config(dev
, s
, insn
, data
);
936 * synchronous instructions
942 * struct comedi_insn struct at arg
948 static int do_insn_ioctl(struct comedi_device
*dev
,
949 struct comedi_insn __user
*arg
, void *file
)
951 struct comedi_insn insn
;
952 unsigned int *data
= NULL
;
955 data
= kmalloc(sizeof(unsigned int) * MAX_SAMPLES
, GFP_KERNEL
);
961 if (copy_from_user(&insn
, arg
, sizeof(struct comedi_insn
))) {
966 /* This is where the behavior of insn and insnlist deviate. */
967 if (insn
.n
> MAX_SAMPLES
)
968 insn
.n
= MAX_SAMPLES
;
969 if (insn
.insn
& INSN_MASK_WRITE
) {
970 if (copy_from_user(data
,
972 insn
.n
* sizeof(unsigned int))) {
977 ret
= parse_insn(dev
, &insn
, data
, file
);
980 if (insn
.insn
& INSN_MASK_READ
) {
981 if (copy_to_user(insn
.data
,
983 insn
.n
* sizeof(unsigned int))) {
996 static void comedi_set_subdevice_runflags(struct comedi_subdevice
*s
,
997 unsigned mask
, unsigned bits
)
1001 spin_lock_irqsave(&s
->spin_lock
, flags
);
1002 s
->runflags
&= ~mask
;
1003 s
->runflags
|= (bits
& mask
);
1004 spin_unlock_irqrestore(&s
->spin_lock
, flags
);
1007 static int do_cmd_ioctl(struct comedi_device
*dev
,
1008 struct comedi_cmd __user
*cmd
, void *file
)
1010 struct comedi_cmd user_cmd
;
1011 struct comedi_subdevice
*s
;
1012 struct comedi_async
*async
;
1014 unsigned int __user
*chanlist_saver
= NULL
;
1016 if (copy_from_user(&user_cmd
, cmd
, sizeof(struct comedi_cmd
))) {
1017 DPRINTK("bad cmd address\n");
1020 /* save user's chanlist pointer so it can be restored later */
1021 chanlist_saver
= user_cmd
.chanlist
;
1023 if (user_cmd
.subdev
>= dev
->n_subdevices
) {
1024 DPRINTK("%d no such subdevice\n", user_cmd
.subdev
);
1028 s
= dev
->subdevices
+ user_cmd
.subdev
;
1031 if (s
->type
== COMEDI_SUBD_UNUSED
) {
1032 DPRINTK("%d not valid subdevice\n", user_cmd
.subdev
);
1036 if (!s
->do_cmd
|| !s
->do_cmdtest
|| !s
->async
) {
1037 DPRINTK("subdevice %i does not support commands\n",
1042 /* are we locked? (ioctl lock) */
1043 if (s
->lock
&& s
->lock
!= file
) {
1044 DPRINTK("subdevice locked\n");
1050 DPRINTK("subdevice busy\n");
1055 /* make sure channel/gain list isn't too long */
1056 if (user_cmd
.chanlist_len
> s
->len_chanlist
) {
1057 DPRINTK("channel/gain list too long %u > %d\n",
1058 user_cmd
.chanlist_len
, s
->len_chanlist
);
1063 /* make sure channel/gain list isn't too short */
1064 if (user_cmd
.chanlist_len
< 1) {
1065 DPRINTK("channel/gain list too short %u < 1\n",
1066 user_cmd
.chanlist_len
);
1071 kfree(async
->cmd
.chanlist
);
1072 async
->cmd
= user_cmd
;
1073 async
->cmd
.data
= NULL
;
1074 /* load channel/gain list */
1075 async
->cmd
.chanlist
=
1076 kmalloc(async
->cmd
.chanlist_len
* sizeof(int), GFP_KERNEL
);
1077 if (!async
->cmd
.chanlist
) {
1078 DPRINTK("allocation failed\n");
1083 if (copy_from_user(async
->cmd
.chanlist
, user_cmd
.chanlist
,
1084 async
->cmd
.chanlist_len
* sizeof(int))) {
1085 DPRINTK("fault reading chanlist\n");
1090 /* make sure each element in channel/gain list is valid */
1091 ret
= comedi_check_chanlist(s
,
1092 async
->cmd
.chanlist_len
,
1093 async
->cmd
.chanlist
);
1095 DPRINTK("bad chanlist\n");
1099 ret
= s
->do_cmdtest(dev
, s
, &async
->cmd
);
1101 if (async
->cmd
.flags
& TRIG_BOGUS
|| ret
) {
1102 DPRINTK("test returned %d\n", ret
);
1103 user_cmd
= async
->cmd
;
1104 /* restore chanlist pointer before copying back */
1105 user_cmd
.chanlist
= chanlist_saver
;
1106 user_cmd
.data
= NULL
;
1107 if (copy_to_user(cmd
, &user_cmd
, sizeof(struct comedi_cmd
))) {
1108 DPRINTK("fault writing cmd\n");
1116 if (!async
->prealloc_bufsz
) {
1118 DPRINTK("no buffer (?)\n");
1122 comedi_reset_async_buf(async
);
1125 COMEDI_CB_EOA
| COMEDI_CB_BLOCK
| COMEDI_CB_ERROR
|
1127 if (async
->cmd
.flags
& TRIG_WAKE_EOS
)
1128 async
->cb_mask
|= COMEDI_CB_EOS
;
1130 comedi_set_subdevice_runflags(s
, ~0, SRF_USER
| SRF_RUNNING
);
1132 ret
= s
->do_cmd(dev
, s
);
1137 do_become_nonbusy(dev
, s
);
1144 command testing ioctl
1147 pointer to cmd structure
1150 cmd structure at arg
1154 modified cmd structure at arg
1157 static int do_cmdtest_ioctl(struct comedi_device
*dev
,
1158 struct comedi_cmd __user
*arg
, void *file
)
1160 struct comedi_cmd user_cmd
;
1161 struct comedi_subdevice
*s
;
1163 unsigned int *chanlist
= NULL
;
1164 unsigned int __user
*chanlist_saver
= NULL
;
1166 if (copy_from_user(&user_cmd
, arg
, sizeof(struct comedi_cmd
))) {
1167 DPRINTK("bad cmd address\n");
1170 /* save user's chanlist pointer so it can be restored later */
1171 chanlist_saver
= user_cmd
.chanlist
;
1173 if (user_cmd
.subdev
>= dev
->n_subdevices
) {
1174 DPRINTK("%d no such subdevice\n", user_cmd
.subdev
);
1178 s
= dev
->subdevices
+ user_cmd
.subdev
;
1179 if (s
->type
== COMEDI_SUBD_UNUSED
) {
1180 DPRINTK("%d not valid subdevice\n", user_cmd
.subdev
);
1184 if (!s
->do_cmd
|| !s
->do_cmdtest
) {
1185 DPRINTK("subdevice %i does not support commands\n",
1190 /* make sure channel/gain list isn't too long */
1191 if (user_cmd
.chanlist_len
> s
->len_chanlist
) {
1192 DPRINTK("channel/gain list too long %d > %d\n",
1193 user_cmd
.chanlist_len
, s
->len_chanlist
);
1198 /* load channel/gain list */
1199 if (user_cmd
.chanlist
) {
1201 kmalloc(user_cmd
.chanlist_len
* sizeof(int), GFP_KERNEL
);
1203 DPRINTK("allocation failed\n");
1208 if (copy_from_user(chanlist
, user_cmd
.chanlist
,
1209 user_cmd
.chanlist_len
* sizeof(int))) {
1210 DPRINTK("fault reading chanlist\n");
1215 /* make sure each element in channel/gain list is valid */
1216 ret
= comedi_check_chanlist(s
, user_cmd
.chanlist_len
, chanlist
);
1218 DPRINTK("bad chanlist\n");
1222 user_cmd
.chanlist
= chanlist
;
1225 ret
= s
->do_cmdtest(dev
, s
, &user_cmd
);
1227 /* restore chanlist pointer before copying back */
1228 user_cmd
.chanlist
= chanlist_saver
;
1230 if (copy_to_user(arg
, &user_cmd
, sizeof(struct comedi_cmd
))) {
1231 DPRINTK("bad cmd address\n");
1256 static int do_lock_ioctl(struct comedi_device
*dev
, unsigned int arg
,
1260 unsigned long flags
;
1261 struct comedi_subdevice
*s
;
1263 if (arg
>= dev
->n_subdevices
)
1265 s
= dev
->subdevices
+ arg
;
1267 spin_lock_irqsave(&s
->spin_lock
, flags
);
1268 if (s
->busy
|| s
->lock
)
1272 spin_unlock_irqrestore(&s
->spin_lock
, flags
);
1279 ret
= s
->lock_f(dev
, s
);
1298 This function isn't protected by the semaphore, since
1299 we already own the lock.
1301 static int do_unlock_ioctl(struct comedi_device
*dev
, unsigned int arg
,
1304 struct comedi_subdevice
*s
;
1306 if (arg
>= dev
->n_subdevices
)
1308 s
= dev
->subdevices
+ arg
;
1313 if (s
->lock
&& s
->lock
!= file
)
1316 if (s
->lock
== file
) {
1330 cancel acquisition ioctl
1342 static int do_cancel_ioctl(struct comedi_device
*dev
, unsigned int arg
,
1345 struct comedi_subdevice
*s
;
1347 if (arg
>= dev
->n_subdevices
)
1349 s
= dev
->subdevices
+ arg
;
1350 if (s
->async
== NULL
)
1353 if (s
->lock
&& s
->lock
!= file
)
1359 if (s
->busy
!= file
)
1362 return do_cancel(dev
, s
);
1367 instructs driver to synchronize buffers
1379 static int do_poll_ioctl(struct comedi_device
*dev
, unsigned int arg
,
1382 struct comedi_subdevice
*s
;
1384 if (arg
>= dev
->n_subdevices
)
1386 s
= dev
->subdevices
+ arg
;
1388 if (s
->lock
&& s
->lock
!= file
)
1394 if (s
->busy
!= file
)
1398 return s
->poll(dev
, s
);
1403 static int do_cancel(struct comedi_device
*dev
, struct comedi_subdevice
*s
)
1407 if ((comedi_get_subdevice_runflags(s
) & SRF_RUNNING
) && s
->cancel
)
1408 ret
= s
->cancel(dev
, s
);
1410 do_become_nonbusy(dev
, s
);
1415 static void comedi_unmap(struct vm_area_struct
*area
)
1417 struct comedi_async
*async
;
1418 struct comedi_device
*dev
;
1420 async
= area
->vm_private_data
;
1421 dev
= async
->subdevice
->device
;
1423 mutex_lock(&dev
->mutex
);
1424 async
->mmap_count
--;
1425 mutex_unlock(&dev
->mutex
);
1428 static struct vm_operations_struct comedi_vm_ops
= {
1429 .close
= comedi_unmap
,
1432 static int comedi_mmap(struct file
*file
, struct vm_area_struct
*vma
)
1434 const unsigned minor
= iminor(file
->f_dentry
->d_inode
);
1435 struct comedi_device_file_info
*dev_file_info
=
1436 comedi_get_device_file_info(minor
);
1437 struct comedi_device
*dev
= dev_file_info
->device
;
1438 struct comedi_async
*async
= NULL
;
1439 unsigned long start
= vma
->vm_start
;
1444 struct comedi_subdevice
*s
;
1446 mutex_lock(&dev
->mutex
);
1447 if (!dev
->attached
) {
1448 DPRINTK("no driver configured on comedi%i\n", dev
->minor
);
1452 if (vma
->vm_flags
& VM_WRITE
)
1453 s
= comedi_get_write_subdevice(dev_file_info
);
1455 s
= comedi_get_read_subdevice(dev_file_info
);
1462 if (async
== NULL
) {
1467 if (vma
->vm_pgoff
!= 0) {
1468 DPRINTK("comedi: mmap() offset must be 0.\n");
1473 size
= vma
->vm_end
- vma
->vm_start
;
1474 if (size
> async
->prealloc_bufsz
) {
1478 if (size
& (~PAGE_MASK
)) {
1483 n_pages
= size
>> PAGE_SHIFT
;
1484 for (i
= 0; i
< n_pages
; ++i
) {
1485 if (remap_pfn_range(vma
, start
,
1486 page_to_pfn(virt_to_page
1487 (async
->buf_page_list
1488 [i
].virt_addr
)), PAGE_SIZE
,
1496 vma
->vm_ops
= &comedi_vm_ops
;
1497 vma
->vm_private_data
= async
;
1499 async
->mmap_count
++;
1503 mutex_unlock(&dev
->mutex
);
1507 static unsigned int comedi_poll(struct file
*file
, poll_table
* wait
)
1509 unsigned int mask
= 0;
1510 const unsigned minor
= iminor(file
->f_dentry
->d_inode
);
1511 struct comedi_device_file_info
*dev_file_info
=
1512 comedi_get_device_file_info(minor
);
1513 struct comedi_device
*dev
= dev_file_info
->device
;
1514 struct comedi_subdevice
*read_subdev
;
1515 struct comedi_subdevice
*write_subdev
;
1517 mutex_lock(&dev
->mutex
);
1518 if (!dev
->attached
) {
1519 DPRINTK("no driver configured on comedi%i\n", dev
->minor
);
1520 mutex_unlock(&dev
->mutex
);
1525 read_subdev
= comedi_get_read_subdevice(dev_file_info
);
1527 poll_wait(file
, &read_subdev
->async
->wait_head
, wait
);
1528 if (!read_subdev
->busy
1529 || comedi_buf_read_n_available(read_subdev
->async
) > 0
1530 || !(comedi_get_subdevice_runflags(read_subdev
) &
1532 mask
|= POLLIN
| POLLRDNORM
;
1535 write_subdev
= comedi_get_write_subdevice(dev_file_info
);
1537 poll_wait(file
, &write_subdev
->async
->wait_head
, wait
);
1538 comedi_buf_write_alloc(write_subdev
->async
,
1539 write_subdev
->async
->prealloc_bufsz
);
1540 if (!write_subdev
->busy
1541 || !(comedi_get_subdevice_runflags(write_subdev
) &
1543 || comedi_buf_write_n_allocated(write_subdev
->async
) >=
1544 bytes_per_sample(write_subdev
->async
->subdevice
)) {
1545 mask
|= POLLOUT
| POLLWRNORM
;
1549 mutex_unlock(&dev
->mutex
);
1553 static ssize_t
comedi_write(struct file
*file
, const char __user
*buf
,
1554 size_t nbytes
, loff_t
*offset
)
1556 struct comedi_subdevice
*s
;
1557 struct comedi_async
*async
;
1558 int n
, m
, count
= 0, retval
= 0;
1559 DECLARE_WAITQUEUE(wait
, current
);
1560 const unsigned minor
= iminor(file
->f_dentry
->d_inode
);
1561 struct comedi_device_file_info
*dev_file_info
=
1562 comedi_get_device_file_info(minor
);
1563 struct comedi_device
*dev
= dev_file_info
->device
;
1565 if (!dev
->attached
) {
1566 DPRINTK("no driver configured on comedi%i\n", dev
->minor
);
1571 s
= comedi_get_write_subdevice(dev_file_info
);
1586 if (s
->busy
!= file
) {
1590 add_wait_queue(&async
->wait_head
, &wait
);
1591 while (nbytes
> 0 && !retval
) {
1592 set_current_state(TASK_INTERRUPTIBLE
);
1594 if (!(comedi_get_subdevice_runflags(s
) & SRF_RUNNING
)) {
1596 if (comedi_get_subdevice_runflags(s
) &
1602 do_become_nonbusy(dev
, s
);
1610 if (async
->buf_write_ptr
+ m
> async
->prealloc_bufsz
)
1611 m
= async
->prealloc_bufsz
- async
->buf_write_ptr
;
1612 comedi_buf_write_alloc(async
, async
->prealloc_bufsz
);
1613 if (m
> comedi_buf_write_n_allocated(async
))
1614 m
= comedi_buf_write_n_allocated(async
);
1619 if (file
->f_flags
& O_NONBLOCK
) {
1623 if (signal_pending(current
)) {
1624 retval
= -ERESTARTSYS
;
1630 if (s
->busy
!= file
) {
1637 m
= copy_from_user(async
->prealloc_buf
+ async
->buf_write_ptr
,
1643 comedi_buf_write_free(async
, n
);
1649 break; /* makes device work like a pipe */
1651 set_current_state(TASK_RUNNING
);
1652 remove_wait_queue(&async
->wait_head
, &wait
);
1655 return count
? count
: retval
;
1658 static ssize_t
comedi_read(struct file
*file
, char __user
*buf
, size_t nbytes
,
1661 struct comedi_subdevice
*s
;
1662 struct comedi_async
*async
;
1663 int n
, m
, count
= 0, retval
= 0;
1664 DECLARE_WAITQUEUE(wait
, current
);
1665 const unsigned minor
= iminor(file
->f_dentry
->d_inode
);
1666 struct comedi_device_file_info
*dev_file_info
=
1667 comedi_get_device_file_info(minor
);
1668 struct comedi_device
*dev
= dev_file_info
->device
;
1670 if (!dev
->attached
) {
1671 DPRINTK("no driver configured on comedi%i\n", dev
->minor
);
1676 s
= comedi_get_read_subdevice(dev_file_info
);
1690 if (s
->busy
!= file
) {
1695 add_wait_queue(&async
->wait_head
, &wait
);
1696 while (nbytes
> 0 && !retval
) {
1697 set_current_state(TASK_INTERRUPTIBLE
);
1701 m
= comedi_buf_read_n_available(async
);
1702 /* printk("%d available\n",m); */
1703 if (async
->buf_read_ptr
+ m
> async
->prealloc_bufsz
)
1704 m
= async
->prealloc_bufsz
- async
->buf_read_ptr
;
1705 /* printk("%d contiguous\n",m); */
1710 if (!(comedi_get_subdevice_runflags(s
) & SRF_RUNNING
)) {
1711 do_become_nonbusy(dev
, s
);
1712 if (comedi_get_subdevice_runflags(s
) &
1720 if (file
->f_flags
& O_NONBLOCK
) {
1724 if (signal_pending(current
)) {
1725 retval
= -ERESTARTSYS
;
1733 if (s
->busy
!= file
) {
1739 m
= copy_to_user(buf
, async
->prealloc_buf
+
1740 async
->buf_read_ptr
, n
);
1746 comedi_buf_read_alloc(async
, n
);
1747 comedi_buf_read_free(async
, n
);
1753 break; /* makes device work like a pipe */
1755 if (!(comedi_get_subdevice_runflags(s
) & (SRF_ERROR
| SRF_RUNNING
)) &&
1756 async
->buf_read_count
- async
->buf_write_count
== 0) {
1757 do_become_nonbusy(dev
, s
);
1759 set_current_state(TASK_RUNNING
);
1760 remove_wait_queue(&async
->wait_head
, &wait
);
1763 return count
? count
: retval
;
1767 This function restores a subdevice to an idle state.
1769 void do_become_nonbusy(struct comedi_device
*dev
, struct comedi_subdevice
*s
)
1771 struct comedi_async
*async
= s
->async
;
1773 comedi_set_subdevice_runflags(s
, SRF_RUNNING
, 0);
1775 comedi_reset_async_buf(async
);
1776 async
->inttrig
= NULL
;
1779 "BUG: (?) do_become_nonbusy called with async=0\n");
1785 static int comedi_open(struct inode
*inode
, struct file
*file
)
1787 const unsigned minor
= iminor(inode
);
1788 struct comedi_device_file_info
*dev_file_info
=
1789 comedi_get_device_file_info(minor
);
1790 struct comedi_device
*dev
=
1791 dev_file_info
? dev_file_info
->device
: NULL
;
1794 DPRINTK("invalid minor number\n");
1798 /* This is slightly hacky, but we want module autoloading
1800 * case: user opens device, attached -> ok
1801 * case: user opens device, unattached, in_request_module=0 -> autoload
1802 * case: user opens device, unattached, in_request_module=1 -> fail
1803 * case: root opens device, attached -> ok
1804 * case: root opens device, unattached, in_request_module=1 -> ok
1805 * (typically called from modprobe)
1806 * case: root opens device, unattached, in_request_module=0 -> autoload
1808 * The last could be changed to "-> ok", which would deny root
1811 mutex_lock(&dev
->mutex
);
1814 if (!capable(CAP_NET_ADMIN
) && dev
->in_request_module
) {
1815 DPRINTK("in request module\n");
1816 mutex_unlock(&dev
->mutex
);
1819 if (capable(CAP_NET_ADMIN
) && dev
->in_request_module
)
1822 dev
->in_request_module
= 1;
1825 mutex_unlock(&dev
->mutex
);
1826 request_module("char-major-%i-%i", COMEDI_MAJOR
, dev
->minor
);
1827 mutex_lock(&dev
->mutex
);
1830 dev
->in_request_module
= 0;
1832 if (!dev
->attached
&& !capable(CAP_NET_ADMIN
)) {
1833 DPRINTK("not attached and not CAP_NET_ADMIN\n");
1834 mutex_unlock(&dev
->mutex
);
1838 __module_get(THIS_MODULE
);
1840 if (dev
->attached
) {
1841 if (!try_module_get(dev
->driver
->module
)) {
1842 module_put(THIS_MODULE
);
1843 mutex_unlock(&dev
->mutex
);
1848 if (dev
->attached
&& dev
->use_count
== 0 && dev
->open
) {
1849 int rc
= dev
->open(dev
);
1851 module_put(dev
->driver
->module
);
1852 module_put(THIS_MODULE
);
1853 mutex_unlock(&dev
->mutex
);
1860 mutex_unlock(&dev
->mutex
);
1865 static int comedi_close(struct inode
*inode
, struct file
*file
)
1867 const unsigned minor
= iminor(inode
);
1868 struct comedi_device_file_info
*dev_file_info
=
1869 comedi_get_device_file_info(minor
);
1870 struct comedi_device
*dev
= dev_file_info
->device
;
1871 struct comedi_subdevice
*s
= NULL
;
1874 mutex_lock(&dev
->mutex
);
1876 if (dev
->subdevices
) {
1877 for (i
= 0; i
< dev
->n_subdevices
; i
++) {
1878 s
= dev
->subdevices
+ i
;
1880 if (s
->busy
== file
)
1882 if (s
->lock
== file
)
1886 if (dev
->attached
&& dev
->use_count
== 1 && dev
->close
)
1889 module_put(THIS_MODULE
);
1891 module_put(dev
->driver
->module
);
1895 mutex_unlock(&dev
->mutex
);
1897 if (file
->f_flags
& FASYNC
)
1898 comedi_fasync(-1, file
, 0);
1903 static int comedi_fasync(int fd
, struct file
*file
, int on
)
1905 const unsigned minor
= iminor(file
->f_dentry
->d_inode
);
1906 struct comedi_device_file_info
*dev_file_info
=
1907 comedi_get_device_file_info(minor
);
1909 struct comedi_device
*dev
= dev_file_info
->device
;
1911 return fasync_helper(fd
, file
, on
, &dev
->async_queue
);
1914 const struct file_operations comedi_fops
= {
1915 .owner
= THIS_MODULE
,
1916 .unlocked_ioctl
= comedi_unlocked_ioctl
,
1917 .compat_ioctl
= comedi_compat_ioctl
,
1918 .open
= comedi_open
,
1919 .release
= comedi_close
,
1920 .read
= comedi_read
,
1921 .write
= comedi_write
,
1922 .mmap
= comedi_mmap
,
1923 .poll
= comedi_poll
,
1924 .fasync
= comedi_fasync
,
1925 .llseek
= noop_llseek
,
1928 struct class *comedi_class
;
1929 static struct cdev comedi_cdev
;
1931 static void comedi_cleanup_legacy_minors(void)
1935 for (i
= 0; i
< comedi_num_legacy_minors
; i
++)
1936 comedi_free_board_minor(i
);
1939 static int __init
comedi_init(void)
1944 printk(KERN_INFO
"comedi: version " COMEDI_RELEASE
1945 " - http://www.comedi.org\n");
1947 if (comedi_num_legacy_minors
< 0 ||
1948 comedi_num_legacy_minors
> COMEDI_NUM_BOARD_MINORS
) {
1949 printk(KERN_ERR
"comedi: error: invalid value for module "
1950 "parameter \"comedi_num_legacy_minors\". Valid values "
1951 "are 0 through %i.\n", COMEDI_NUM_BOARD_MINORS
);
1956 * comedi is unusable if both comedi_autoconfig and
1957 * comedi_num_legacy_minors are zero, so we might as well adjust the
1958 * defaults in that case
1960 if (comedi_autoconfig
== 0 && comedi_num_legacy_minors
== 0)
1961 comedi_num_legacy_minors
= 16;
1963 memset(comedi_file_info_table
, 0,
1964 sizeof(struct comedi_device_file_info
*) * COMEDI_NUM_MINORS
);
1966 retval
= register_chrdev_region(MKDEV(COMEDI_MAJOR
, 0),
1967 COMEDI_NUM_MINORS
, "comedi");
1970 cdev_init(&comedi_cdev
, &comedi_fops
);
1971 comedi_cdev
.owner
= THIS_MODULE
;
1972 kobject_set_name(&comedi_cdev
.kobj
, "comedi");
1973 if (cdev_add(&comedi_cdev
, MKDEV(COMEDI_MAJOR
, 0), COMEDI_NUM_MINORS
)) {
1974 unregister_chrdev_region(MKDEV(COMEDI_MAJOR
, 0),
1978 comedi_class
= class_create(THIS_MODULE
, "comedi");
1979 if (IS_ERR(comedi_class
)) {
1980 printk(KERN_ERR
"comedi: failed to create class");
1981 cdev_del(&comedi_cdev
);
1982 unregister_chrdev_region(MKDEV(COMEDI_MAJOR
, 0),
1984 return PTR_ERR(comedi_class
);
1987 /* XXX requires /proc interface */
1990 /* create devices files for legacy/manual use */
1991 for (i
= 0; i
< comedi_num_legacy_minors
; i
++) {
1993 minor
= comedi_alloc_board_minor(NULL
);
1995 comedi_cleanup_legacy_minors();
1996 cdev_del(&comedi_cdev
);
1997 unregister_chrdev_region(MKDEV(COMEDI_MAJOR
, 0),
2006 static void __exit
comedi_cleanup(void)
2010 comedi_cleanup_legacy_minors();
2011 for (i
= 0; i
< COMEDI_NUM_MINORS
; ++i
)
2012 BUG_ON(comedi_file_info_table
[i
]);
2014 class_destroy(comedi_class
);
2015 cdev_del(&comedi_cdev
);
2016 unregister_chrdev_region(MKDEV(COMEDI_MAJOR
, 0), COMEDI_NUM_MINORS
);
2018 comedi_proc_cleanup();
2021 module_init(comedi_init
);
2022 module_exit(comedi_cleanup
);
2024 void comedi_error(const struct comedi_device
*dev
, const char *s
)
2026 printk(KERN_ERR
"comedi%d: %s: %s\n", dev
->minor
,
2027 dev
->driver
->driver_name
, s
);
2029 EXPORT_SYMBOL(comedi_error
);
2031 void comedi_event(struct comedi_device
*dev
, struct comedi_subdevice
*s
)
2033 struct comedi_async
*async
= s
->async
;
2034 unsigned runflags
= 0;
2035 unsigned runflags_mask
= 0;
2037 /* DPRINTK("comedi_event 0x%x\n",mask); */
2039 if ((comedi_get_subdevice_runflags(s
) & SRF_RUNNING
) == 0)
2043 async
->events
& (COMEDI_CB_EOA
| COMEDI_CB_ERROR
|
2044 COMEDI_CB_OVERFLOW
)) {
2045 runflags_mask
|= SRF_RUNNING
;
2047 /* remember if an error event has occured, so an error
2048 * can be returned the next time the user does a read() */
2049 if (s
->async
->events
& (COMEDI_CB_ERROR
| COMEDI_CB_OVERFLOW
)) {
2050 runflags_mask
|= SRF_ERROR
;
2051 runflags
|= SRF_ERROR
;
2053 if (runflags_mask
) {
2054 /*sets SRF_ERROR and SRF_RUNNING together atomically */
2055 comedi_set_subdevice_runflags(s
, runflags_mask
, runflags
);
2058 if (async
->cb_mask
& s
->async
->events
) {
2059 if (comedi_get_subdevice_runflags(s
) & SRF_USER
) {
2060 wake_up_interruptible(&async
->wait_head
);
2061 if (s
->subdev_flags
& SDF_CMD_READ
)
2062 kill_fasync(&dev
->async_queue
, SIGIO
, POLL_IN
);
2063 if (s
->subdev_flags
& SDF_CMD_WRITE
)
2064 kill_fasync(&dev
->async_queue
, SIGIO
, POLL_OUT
);
2067 async
->cb_func(s
->async
->events
, async
->cb_arg
);
2070 s
->async
->events
= 0;
2072 EXPORT_SYMBOL(comedi_event
);
2074 unsigned comedi_get_subdevice_runflags(struct comedi_subdevice
*s
)
2076 unsigned long flags
;
2079 spin_lock_irqsave(&s
->spin_lock
, flags
);
2080 runflags
= s
->runflags
;
2081 spin_unlock_irqrestore(&s
->spin_lock
, flags
);
2084 EXPORT_SYMBOL(comedi_get_subdevice_runflags
);
2086 static int is_device_busy(struct comedi_device
*dev
)
2088 struct comedi_subdevice
*s
;
2094 for (i
= 0; i
< dev
->n_subdevices
; i
++) {
2095 s
= dev
->subdevices
+ i
;
2098 if (s
->async
&& s
->async
->mmap_count
)
2105 static void comedi_device_init(struct comedi_device
*dev
)
2107 memset(dev
, 0, sizeof(struct comedi_device
));
2108 spin_lock_init(&dev
->spinlock
);
2109 mutex_init(&dev
->mutex
);
2113 static void comedi_device_cleanup(struct comedi_device
*dev
)
2117 mutex_lock(&dev
->mutex
);
2118 comedi_device_detach(dev
);
2119 mutex_unlock(&dev
->mutex
);
2120 mutex_destroy(&dev
->mutex
);
2123 int comedi_alloc_board_minor(struct device
*hardware_device
)
2125 unsigned long flags
;
2126 struct comedi_device_file_info
*info
;
2127 struct device
*csdev
;
2131 info
= kzalloc(sizeof(struct comedi_device_file_info
), GFP_KERNEL
);
2134 info
->device
= kzalloc(sizeof(struct comedi_device
), GFP_KERNEL
);
2135 if (info
->device
== NULL
) {
2139 comedi_device_init(info
->device
);
2140 spin_lock_irqsave(&comedi_file_info_table_lock
, flags
);
2141 for (i
= 0; i
< COMEDI_NUM_BOARD_MINORS
; ++i
) {
2142 if (comedi_file_info_table
[i
] == NULL
) {
2143 comedi_file_info_table
[i
] = info
;
2147 spin_unlock_irqrestore(&comedi_file_info_table_lock
, flags
);
2148 if (i
== COMEDI_NUM_BOARD_MINORS
) {
2149 comedi_device_cleanup(info
->device
);
2150 kfree(info
->device
);
2154 "ran out of minor numbers for board device files.\n");
2157 info
->device
->minor
= i
;
2158 csdev
= COMEDI_DEVICE_CREATE(comedi_class
, NULL
,
2159 MKDEV(COMEDI_MAJOR
, i
), NULL
,
2160 hardware_device
, "comedi%i", i
);
2162 info
->device
->class_dev
= csdev
;
2163 dev_set_drvdata(csdev
, info
);
2164 retval
= device_create_file(csdev
, &dev_attr_max_read_buffer_kb
);
2168 "failed to create sysfs attribute file \"%s\".\n",
2169 dev_attr_max_read_buffer_kb
.attr
.name
);
2170 comedi_free_board_minor(i
);
2173 retval
= device_create_file(csdev
, &dev_attr_read_buffer_kb
);
2177 "failed to create sysfs attribute file \"%s\".\n",
2178 dev_attr_read_buffer_kb
.attr
.name
);
2179 comedi_free_board_minor(i
);
2182 retval
= device_create_file(csdev
, &dev_attr_max_write_buffer_kb
);
2186 "failed to create sysfs attribute file \"%s\".\n",
2187 dev_attr_max_write_buffer_kb
.attr
.name
);
2188 comedi_free_board_minor(i
);
2191 retval
= device_create_file(csdev
, &dev_attr_write_buffer_kb
);
2195 "failed to create sysfs attribute file \"%s\".\n",
2196 dev_attr_write_buffer_kb
.attr
.name
);
2197 comedi_free_board_minor(i
);
2203 void comedi_free_board_minor(unsigned minor
)
2205 unsigned long flags
;
2206 struct comedi_device_file_info
*info
;
2208 BUG_ON(minor
>= COMEDI_NUM_BOARD_MINORS
);
2209 spin_lock_irqsave(&comedi_file_info_table_lock
, flags
);
2210 info
= comedi_file_info_table
[minor
];
2211 comedi_file_info_table
[minor
] = NULL
;
2212 spin_unlock_irqrestore(&comedi_file_info_table_lock
, flags
);
2215 struct comedi_device
*dev
= info
->device
;
2217 if (dev
->class_dev
) {
2218 device_destroy(comedi_class
,
2219 MKDEV(COMEDI_MAJOR
, dev
->minor
));
2221 comedi_device_cleanup(dev
);
2228 int comedi_alloc_subdevice_minor(struct comedi_device
*dev
,
2229 struct comedi_subdevice
*s
)
2231 unsigned long flags
;
2232 struct comedi_device_file_info
*info
;
2233 struct device
*csdev
;
2237 info
= kmalloc(sizeof(struct comedi_device_file_info
), GFP_KERNEL
);
2241 info
->read_subdevice
= s
;
2242 info
->write_subdevice
= s
;
2243 spin_lock_irqsave(&comedi_file_info_table_lock
, flags
);
2244 for (i
= COMEDI_FIRST_SUBDEVICE_MINOR
; i
< COMEDI_NUM_MINORS
; ++i
) {
2245 if (comedi_file_info_table
[i
] == NULL
) {
2246 comedi_file_info_table
[i
] = info
;
2250 spin_unlock_irqrestore(&comedi_file_info_table_lock
, flags
);
2251 if (i
== COMEDI_NUM_MINORS
) {
2255 "ran out of minor numbers for board device files.\n");
2259 csdev
= COMEDI_DEVICE_CREATE(comedi_class
, dev
->class_dev
,
2260 MKDEV(COMEDI_MAJOR
, i
), NULL
, NULL
,
2261 "comedi%i_subd%i", dev
->minor
,
2262 (int)(s
- dev
->subdevices
));
2264 s
->class_dev
= csdev
;
2265 dev_set_drvdata(csdev
, info
);
2266 retval
= device_create_file(csdev
, &dev_attr_max_read_buffer_kb
);
2270 "failed to create sysfs attribute file \"%s\".\n",
2271 dev_attr_max_read_buffer_kb
.attr
.name
);
2272 comedi_free_subdevice_minor(s
);
2275 retval
= device_create_file(csdev
, &dev_attr_read_buffer_kb
);
2279 "failed to create sysfs attribute file \"%s\".\n",
2280 dev_attr_read_buffer_kb
.attr
.name
);
2281 comedi_free_subdevice_minor(s
);
2284 retval
= device_create_file(csdev
, &dev_attr_max_write_buffer_kb
);
2288 "failed to create sysfs attribute file \"%s\".\n",
2289 dev_attr_max_write_buffer_kb
.attr
.name
);
2290 comedi_free_subdevice_minor(s
);
2293 retval
= device_create_file(csdev
, &dev_attr_write_buffer_kb
);
2297 "failed to create sysfs attribute file \"%s\".\n",
2298 dev_attr_write_buffer_kb
.attr
.name
);
2299 comedi_free_subdevice_minor(s
);
2305 void comedi_free_subdevice_minor(struct comedi_subdevice
*s
)
2307 unsigned long flags
;
2308 struct comedi_device_file_info
*info
;
2315 BUG_ON(s
->minor
>= COMEDI_NUM_MINORS
);
2316 BUG_ON(s
->minor
< COMEDI_FIRST_SUBDEVICE_MINOR
);
2318 spin_lock_irqsave(&comedi_file_info_table_lock
, flags
);
2319 info
= comedi_file_info_table
[s
->minor
];
2320 comedi_file_info_table
[s
->minor
] = NULL
;
2321 spin_unlock_irqrestore(&comedi_file_info_table_lock
, flags
);
2324 device_destroy(comedi_class
, MKDEV(COMEDI_MAJOR
, s
->minor
));
2325 s
->class_dev
= NULL
;
2330 struct comedi_device_file_info
*comedi_get_device_file_info(unsigned minor
)
2332 unsigned long flags
;
2333 struct comedi_device_file_info
*info
;
2335 BUG_ON(minor
>= COMEDI_NUM_MINORS
);
2336 spin_lock_irqsave(&comedi_file_info_table_lock
, flags
);
2337 info
= comedi_file_info_table
[minor
];
2338 spin_unlock_irqrestore(&comedi_file_info_table_lock
, flags
);
2341 EXPORT_SYMBOL_GPL(comedi_get_device_file_info
);
2343 static int resize_async_buffer(struct comedi_device
*dev
,
2344 struct comedi_subdevice
*s
,
2345 struct comedi_async
*async
, unsigned new_size
)
2349 if (new_size
> async
->max_bufsize
)
2353 DPRINTK("subdevice is busy, cannot resize buffer\n");
2356 if (async
->mmap_count
) {
2357 DPRINTK("subdevice is mmapped, cannot resize buffer\n");
2361 if (!async
->prealloc_buf
)
2364 /* make sure buffer is an integral number of pages
2366 new_size
= (new_size
+ PAGE_SIZE
- 1) & PAGE_MASK
;
2368 retval
= comedi_buf_alloc(dev
, s
, new_size
);
2372 if (s
->buf_change
) {
2373 retval
= s
->buf_change(dev
, s
, new_size
);
2378 DPRINTK("comedi%i subd %d buffer resized to %i bytes\n",
2379 dev
->minor
, (int)(s
- dev
->subdevices
), async
->prealloc_bufsz
);
2383 /* sysfs attribute files */
2385 static const unsigned bytes_per_kibi
= 1024;
2387 static ssize_t
show_max_read_buffer_kb(struct device
*dev
,
2388 struct device_attribute
*attr
, char *buf
)
2391 struct comedi_device_file_info
*info
= dev_get_drvdata(dev
);
2392 unsigned max_buffer_size_kb
= 0;
2393 struct comedi_subdevice
*const read_subdevice
=
2394 comedi_get_read_subdevice(info
);
2396 mutex_lock(&info
->device
->mutex
);
2397 if (read_subdevice
&&
2398 (read_subdevice
->subdev_flags
& SDF_CMD_READ
) &&
2399 read_subdevice
->async
) {
2400 max_buffer_size_kb
= read_subdevice
->async
->max_bufsize
/
2403 retval
= snprintf(buf
, PAGE_SIZE
, "%i\n", max_buffer_size_kb
);
2404 mutex_unlock(&info
->device
->mutex
);
2409 static ssize_t
store_max_read_buffer_kb(struct device
*dev
,
2410 struct device_attribute
*attr
,
2411 const char *buf
, size_t count
)
2413 struct comedi_device_file_info
*info
= dev_get_drvdata(dev
);
2414 unsigned long new_max_size_kb
;
2415 uint64_t new_max_size
;
2416 struct comedi_subdevice
*const read_subdevice
=
2417 comedi_get_read_subdevice(info
);
2419 if (strict_strtoul(buf
, 10, &new_max_size_kb
))
2421 if (new_max_size_kb
!= (uint32_t) new_max_size_kb
)
2423 new_max_size
= ((uint64_t) new_max_size_kb
) * bytes_per_kibi
;
2424 if (new_max_size
!= (uint32_t) new_max_size
)
2427 mutex_lock(&info
->device
->mutex
);
2428 if (read_subdevice
== NULL
||
2429 (read_subdevice
->subdev_flags
& SDF_CMD_READ
) == 0 ||
2430 read_subdevice
->async
== NULL
) {
2431 mutex_unlock(&info
->device
->mutex
);
2434 read_subdevice
->async
->max_bufsize
= new_max_size
;
2435 mutex_unlock(&info
->device
->mutex
);
2440 static struct device_attribute dev_attr_max_read_buffer_kb
= {
2442 .name
= "max_read_buffer_kb",
2443 .mode
= S_IRUGO
| S_IWUSR
},
2444 .show
= &show_max_read_buffer_kb
,
2445 .store
= &store_max_read_buffer_kb
2448 static ssize_t
show_read_buffer_kb(struct device
*dev
,
2449 struct device_attribute
*attr
, char *buf
)
2452 struct comedi_device_file_info
*info
= dev_get_drvdata(dev
);
2453 unsigned buffer_size_kb
= 0;
2454 struct comedi_subdevice
*const read_subdevice
=
2455 comedi_get_read_subdevice(info
);
2457 mutex_lock(&info
->device
->mutex
);
2458 if (read_subdevice
&&
2459 (read_subdevice
->subdev_flags
& SDF_CMD_READ
) &&
2460 read_subdevice
->async
) {
2461 buffer_size_kb
= read_subdevice
->async
->prealloc_bufsz
/
2464 retval
= snprintf(buf
, PAGE_SIZE
, "%i\n", buffer_size_kb
);
2465 mutex_unlock(&info
->device
->mutex
);
2470 static ssize_t
store_read_buffer_kb(struct device
*dev
,
2471 struct device_attribute
*attr
,
2472 const char *buf
, size_t count
)
2474 struct comedi_device_file_info
*info
= dev_get_drvdata(dev
);
2475 unsigned long new_size_kb
;
2478 struct comedi_subdevice
*const read_subdevice
=
2479 comedi_get_read_subdevice(info
);
2481 if (strict_strtoul(buf
, 10, &new_size_kb
))
2483 if (new_size_kb
!= (uint32_t) new_size_kb
)
2485 new_size
= ((uint64_t) new_size_kb
) * bytes_per_kibi
;
2486 if (new_size
!= (uint32_t) new_size
)
2489 mutex_lock(&info
->device
->mutex
);
2490 if (read_subdevice
== NULL
||
2491 (read_subdevice
->subdev_flags
& SDF_CMD_READ
) == 0 ||
2492 read_subdevice
->async
== NULL
) {
2493 mutex_unlock(&info
->device
->mutex
);
2496 retval
= resize_async_buffer(info
->device
, read_subdevice
,
2497 read_subdevice
->async
, new_size
);
2498 mutex_unlock(&info
->device
->mutex
);
2505 static struct device_attribute dev_attr_read_buffer_kb
= {
2507 .name
= "read_buffer_kb",
2508 .mode
= S_IRUGO
| S_IWUSR
| S_IWGRP
},
2509 .show
= &show_read_buffer_kb
,
2510 .store
= &store_read_buffer_kb
2513 static ssize_t
show_max_write_buffer_kb(struct device
*dev
,
2514 struct device_attribute
*attr
,
2518 struct comedi_device_file_info
*info
= dev_get_drvdata(dev
);
2519 unsigned max_buffer_size_kb
= 0;
2520 struct comedi_subdevice
*const write_subdevice
=
2521 comedi_get_write_subdevice(info
);
2523 mutex_lock(&info
->device
->mutex
);
2524 if (write_subdevice
&&
2525 (write_subdevice
->subdev_flags
& SDF_CMD_WRITE
) &&
2526 write_subdevice
->async
) {
2527 max_buffer_size_kb
= write_subdevice
->async
->max_bufsize
/
2530 retval
= snprintf(buf
, PAGE_SIZE
, "%i\n", max_buffer_size_kb
);
2531 mutex_unlock(&info
->device
->mutex
);
2536 static ssize_t
store_max_write_buffer_kb(struct device
*dev
,
2537 struct device_attribute
*attr
,
2538 const char *buf
, size_t count
)
2540 struct comedi_device_file_info
*info
= dev_get_drvdata(dev
);
2541 unsigned long new_max_size_kb
;
2542 uint64_t new_max_size
;
2543 struct comedi_subdevice
*const write_subdevice
=
2544 comedi_get_write_subdevice(info
);
2546 if (strict_strtoul(buf
, 10, &new_max_size_kb
))
2548 if (new_max_size_kb
!= (uint32_t) new_max_size_kb
)
2550 new_max_size
= ((uint64_t) new_max_size_kb
) * bytes_per_kibi
;
2551 if (new_max_size
!= (uint32_t) new_max_size
)
2554 mutex_lock(&info
->device
->mutex
);
2555 if (write_subdevice
== NULL
||
2556 (write_subdevice
->subdev_flags
& SDF_CMD_WRITE
) == 0 ||
2557 write_subdevice
->async
== NULL
) {
2558 mutex_unlock(&info
->device
->mutex
);
2561 write_subdevice
->async
->max_bufsize
= new_max_size
;
2562 mutex_unlock(&info
->device
->mutex
);
2567 static struct device_attribute dev_attr_max_write_buffer_kb
= {
2569 .name
= "max_write_buffer_kb",
2570 .mode
= S_IRUGO
| S_IWUSR
},
2571 .show
= &show_max_write_buffer_kb
,
2572 .store
= &store_max_write_buffer_kb
2575 static ssize_t
show_write_buffer_kb(struct device
*dev
,
2576 struct device_attribute
*attr
, char *buf
)
2579 struct comedi_device_file_info
*info
= dev_get_drvdata(dev
);
2580 unsigned buffer_size_kb
= 0;
2581 struct comedi_subdevice
*const write_subdevice
=
2582 comedi_get_write_subdevice(info
);
2584 mutex_lock(&info
->device
->mutex
);
2585 if (write_subdevice
&&
2586 (write_subdevice
->subdev_flags
& SDF_CMD_WRITE
) &&
2587 write_subdevice
->async
) {
2588 buffer_size_kb
= write_subdevice
->async
->prealloc_bufsz
/
2591 retval
= snprintf(buf
, PAGE_SIZE
, "%i\n", buffer_size_kb
);
2592 mutex_unlock(&info
->device
->mutex
);
2597 static ssize_t
store_write_buffer_kb(struct device
*dev
,
2598 struct device_attribute
*attr
,
2599 const char *buf
, size_t count
)
2601 struct comedi_device_file_info
*info
= dev_get_drvdata(dev
);
2602 unsigned long new_size_kb
;
2605 struct comedi_subdevice
*const write_subdevice
=
2606 comedi_get_write_subdevice(info
);
2608 if (strict_strtoul(buf
, 10, &new_size_kb
))
2610 if (new_size_kb
!= (uint32_t) new_size_kb
)
2612 new_size
= ((uint64_t) new_size_kb
) * bytes_per_kibi
;
2613 if (new_size
!= (uint32_t) new_size
)
2616 mutex_lock(&info
->device
->mutex
);
2617 if (write_subdevice
== NULL
||
2618 (write_subdevice
->subdev_flags
& SDF_CMD_WRITE
) == 0 ||
2619 write_subdevice
->async
== NULL
) {
2620 mutex_unlock(&info
->device
->mutex
);
2623 retval
= resize_async_buffer(info
->device
, write_subdevice
,
2624 write_subdevice
->async
, new_size
);
2625 mutex_unlock(&info
->device
->mutex
);
2632 static struct device_attribute dev_attr_write_buffer_kb
= {
2634 .name
= "write_buffer_kb",
2635 .mode
= S_IRUGO
| S_IWUSR
| S_IWGRP
},
2636 .show
= &show_write_buffer_kb
,
2637 .store
= &store_write_buffer_kb