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 static 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 strlcpy(devinfo.driver_name, dev->driver->driver_name, COMEDI_NAMELEN);
387 strlcpy(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);
914 /* Most drivers ignore the base channel in
915 * insn->chanspec. Fix this here if
916 * the subdevice has <= 32 channels. */
918 unsigned int orig_mask;
921 if (s->n_chan <= 32) {
922 shift = CR_CHAN(insn->chanspec);
930 ret = s->insn_bits(dev, s, insn, data);
937 ret = check_insn_config_length(insn, data);
940 ret = s->insn_config(dev, s, insn, data);
956 * synchronous instructions
962 * struct comedi_insn struct at arg
968 static int do_insn_ioctl(struct comedi_device *dev,
969 struct comedi_insn __user *arg, void *file)
971 struct comedi_insn insn;
972 unsigned int *data = NULL;
975 data = kmalloc(sizeof(unsigned int) * MAX_SAMPLES, GFP_KERNEL);
981 if (copy_from_user(&insn, arg, sizeof(struct comedi_insn))) {
986 /* This is where the behavior of insn and insnlist deviate. */
987 if (insn.n > MAX_SAMPLES)
988 insn.n = MAX_SAMPLES;
989 if (insn.insn & INSN_MASK_WRITE) {
990 if (copy_from_user(data,
992 insn.n * sizeof(unsigned int))) {
997 ret = parse_insn(dev, &insn, data, file);
1000 if (insn.insn & INSN_MASK_READ) {
1001 if (copy_to_user(insn.data,
1003 insn.n * sizeof(unsigned int))) {
1016 static void comedi_set_subdevice_runflags(struct comedi_subdevice *s,
1017 unsigned mask, unsigned bits)
1019 unsigned long flags;
1021 spin_lock_irqsave(&s->spin_lock, flags);
1022 s->runflags &= ~mask;
1023 s->runflags |= (bits & mask);
1024 spin_unlock_irqrestore(&s->spin_lock, flags);
1027 static int do_cmd_ioctl(struct comedi_device *dev,
1028 struct comedi_cmd __user *cmd, void *file)
1030 struct comedi_cmd user_cmd;
1031 struct comedi_subdevice *s;
1032 struct comedi_async *async;
1034 unsigned int __user *chanlist_saver = NULL;
1036 if (copy_from_user(&user_cmd, cmd, sizeof(struct comedi_cmd))) {
1037 DPRINTK("bad cmd address\n");
1040 /* save user's chanlist pointer so it can be restored later */
1041 chanlist_saver = user_cmd.chanlist;
1043 if (user_cmd.subdev >= dev->n_subdevices) {
1044 DPRINTK("%d no such subdevice\n", user_cmd.subdev);
1048 s = dev->subdevices + user_cmd.subdev;
1051 if (s->type == COMEDI_SUBD_UNUSED) {
1052 DPRINTK("%d not valid subdevice\n", user_cmd.subdev);
1056 if (!s->do_cmd || !s->do_cmdtest || !s->async) {
1057 DPRINTK("subdevice %i does not support commands\n",
1062 /* are we locked? (ioctl lock) */
1063 if (s->lock && s->lock != file) {
1064 DPRINTK("subdevice locked\n");
1070 DPRINTK("subdevice busy\n");
1075 /* make sure channel/gain list isn't too long */
1076 if (user_cmd.chanlist_len > s->len_chanlist) {
1077 DPRINTK("channel/gain list too long %u > %d\n",
1078 user_cmd.chanlist_len, s->len_chanlist);
1083 /* make sure channel/gain list isn't too short */
1084 if (user_cmd.chanlist_len < 1) {
1085 DPRINTK("channel/gain list too short %u < 1\n",
1086 user_cmd.chanlist_len);
1091 kfree(async->cmd.chanlist);
1092 async->cmd = user_cmd;
1093 async->cmd.data = NULL;
1094 /* load channel/gain list */
1095 async->cmd.chanlist =
1096 kmalloc(async->cmd.chanlist_len * sizeof(int), GFP_KERNEL);
1097 if (!async->cmd.chanlist) {
1098 DPRINTK("allocation failed\n");
1103 if (copy_from_user(async->cmd.chanlist, user_cmd.chanlist,
1104 async->cmd.chanlist_len * sizeof(int))) {
1105 DPRINTK("fault reading chanlist\n");
1110 /* make sure each element in channel/gain list is valid */
1111 ret = comedi_check_chanlist(s,
1112 async->cmd.chanlist_len,
1113 async->cmd.chanlist);
1115 DPRINTK("bad chanlist\n");
1119 ret = s->do_cmdtest(dev, s, &async->cmd);
1121 if (async->cmd.flags & TRIG_BOGUS || ret) {
1122 DPRINTK("test returned %d\n", ret);
1123 user_cmd = async->cmd;
1124 /* restore chanlist pointer before copying back */
1125 user_cmd.chanlist = chanlist_saver;
1126 user_cmd.data = NULL;
1127 if (copy_to_user(cmd, &user_cmd, sizeof(struct comedi_cmd))) {
1128 DPRINTK("fault writing cmd\n");
1136 if (!async->prealloc_bufsz) {
1138 DPRINTK("no buffer (?)\n");
1142 comedi_reset_async_buf(async);
1145 COMEDI_CB_EOA | COMEDI_CB_BLOCK | COMEDI_CB_ERROR |
1147 if (async->cmd.flags & TRIG_WAKE_EOS)
1148 async->cb_mask |= COMEDI_CB_EOS;
1150 comedi_set_subdevice_runflags(s, ~0, SRF_USER | SRF_RUNNING);
1152 ret = s->do_cmd(dev, s);
1157 do_become_nonbusy(dev, s);
1164 command testing ioctl
1167 pointer to cmd structure
1170 cmd structure at arg
1174 modified cmd structure at arg
1177 static int do_cmdtest_ioctl(struct comedi_device *dev,
1178 struct comedi_cmd __user *arg, void *file)
1180 struct comedi_cmd user_cmd;
1181 struct comedi_subdevice *s;
1183 unsigned int *chanlist = NULL;
1184 unsigned int __user *chanlist_saver = NULL;
1186 if (copy_from_user(&user_cmd, arg, sizeof(struct comedi_cmd))) {
1187 DPRINTK("bad cmd address\n");
1190 /* save user's chanlist pointer so it can be restored later */
1191 chanlist_saver = user_cmd.chanlist;
1193 if (user_cmd.subdev >= dev->n_subdevices) {
1194 DPRINTK("%d no such subdevice\n", user_cmd.subdev);
1198 s = dev->subdevices + user_cmd.subdev;
1199 if (s->type == COMEDI_SUBD_UNUSED) {
1200 DPRINTK("%d not valid subdevice\n", user_cmd.subdev);
1204 if (!s->do_cmd || !s->do_cmdtest) {
1205 DPRINTK("subdevice %i does not support commands\n",
1210 /* make sure channel/gain list isn't too long */
1211 if (user_cmd.chanlist_len > s->len_chanlist) {
1212 DPRINTK("channel/gain list too long %d > %d\n",
1213 user_cmd.chanlist_len, s->len_chanlist);
1218 /* load channel/gain list */
1219 if (user_cmd.chanlist) {
1221 kmalloc(user_cmd.chanlist_len * sizeof(int), GFP_KERNEL);
1223 DPRINTK("allocation failed\n");
1228 if (copy_from_user(chanlist, user_cmd.chanlist,
1229 user_cmd.chanlist_len * sizeof(int))) {
1230 DPRINTK("fault reading chanlist\n");
1235 /* make sure each element in channel/gain list is valid */
1236 ret = comedi_check_chanlist(s, user_cmd.chanlist_len, chanlist);
1238 DPRINTK("bad chanlist\n");
1242 user_cmd.chanlist = chanlist;
1245 ret = s->do_cmdtest(dev, s, &user_cmd);
1247 /* restore chanlist pointer before copying back */
1248 user_cmd.chanlist = chanlist_saver;
1250 if (copy_to_user(arg, &user_cmd, sizeof(struct comedi_cmd))) {
1251 DPRINTK("bad cmd address\n");
1276 static int do_lock_ioctl(struct comedi_device *dev, unsigned int arg,
1280 unsigned long flags;
1281 struct comedi_subdevice *s;
1283 if (arg >= dev->n_subdevices)
1285 s = dev->subdevices + arg;
1287 spin_lock_irqsave(&s->spin_lock, flags);
1288 if (s->busy || s->lock)
1292 spin_unlock_irqrestore(&s->spin_lock, flags);
1299 ret = s->lock_f(dev, s);
1318 This function isn't protected by the semaphore, since
1319 we already own the lock.
1321 static int do_unlock_ioctl(struct comedi_device *dev, unsigned int arg,
1324 struct comedi_subdevice *s;
1326 if (arg >= dev->n_subdevices)
1328 s = dev->subdevices + arg;
1333 if (s->lock && s->lock != file)
1336 if (s->lock == file) {
1350 cancel acquisition ioctl
1362 static int do_cancel_ioctl(struct comedi_device *dev, unsigned int arg,
1365 struct comedi_subdevice *s;
1367 if (arg >= dev->n_subdevices)
1369 s = dev->subdevices + arg;
1370 if (s->async == NULL)
1373 if (s->lock && s->lock != file)
1379 if (s->busy != file)
1382 return do_cancel(dev, s);
1387 instructs driver to synchronize buffers
1399 static int do_poll_ioctl(struct comedi_device *dev, unsigned int arg,
1402 struct comedi_subdevice *s;
1404 if (arg >= dev->n_subdevices)
1406 s = dev->subdevices + arg;
1408 if (s->lock && s->lock != file)
1414 if (s->busy != file)
1418 return s->poll(dev, s);
1423 static int do_cancel(struct comedi_device *dev, struct comedi_subdevice *s)
1427 if ((comedi_get_subdevice_runflags(s) & SRF_RUNNING) && s->cancel)
1428 ret = s->cancel(dev, s);
1430 do_become_nonbusy(dev, s);
1435 static void comedi_unmap(struct vm_area_struct *area)
1437 struct comedi_async *async;
1438 struct comedi_device *dev;
1440 async = area->vm_private_data;
1441 dev = async->subdevice->device;
1443 mutex_lock(&dev->mutex);
1444 async->mmap_count--;
1445 mutex_unlock(&dev->mutex);
1448 static struct vm_operations_struct comedi_vm_ops = {
1449 .close = comedi_unmap,
1452 static int comedi_mmap(struct file *file, struct vm_area_struct *vma)
1454 const unsigned minor = iminor(file->f_dentry->d_inode);
1455 struct comedi_device_file_info *dev_file_info =
1456 comedi_get_device_file_info(minor);
1457 struct comedi_device *dev = dev_file_info->device;
1458 struct comedi_async *async = NULL;
1459 unsigned long start = vma->vm_start;
1464 struct comedi_subdevice *s;
1466 mutex_lock(&dev->mutex);
1467 if (!dev->attached) {
1468 DPRINTK("no driver configured on comedi%i\n", dev->minor);
1472 if (vma->vm_flags & VM_WRITE)
1473 s = comedi_get_write_subdevice(dev_file_info);
1475 s = comedi_get_read_subdevice(dev_file_info);
1482 if (async == NULL) {
1487 if (vma->vm_pgoff != 0) {
1488 DPRINTK("comedi: mmap() offset must be 0.\n");
1493 size = vma->vm_end - vma->vm_start;
1494 if (size > async->prealloc_bufsz) {
1498 if (size & (~PAGE_MASK)) {
1503 n_pages = size >> PAGE_SHIFT;
1504 for (i = 0; i < n_pages; ++i) {
1505 if (remap_pfn_range(vma, start,
1506 page_to_pfn(virt_to_page
1507 (async->buf_page_list
1508 [i].virt_addr)), PAGE_SIZE,
1516 vma->vm_ops = &comedi_vm_ops;
1517 vma->vm_private_data = async;
1519 async->mmap_count++;
1523 mutex_unlock(&dev->mutex);
1527 static unsigned int comedi_poll(struct file *file, poll_table * wait)
1529 unsigned int mask = 0;
1530 const unsigned minor = iminor(file->f_dentry->d_inode);
1531 struct comedi_device_file_info *dev_file_info =
1532 comedi_get_device_file_info(minor);
1533 struct comedi_device *dev = dev_file_info->device;
1534 struct comedi_subdevice *read_subdev;
1535 struct comedi_subdevice *write_subdev;
1537 mutex_lock(&dev->mutex);
1538 if (!dev->attached) {
1539 DPRINTK("no driver configured on comedi%i\n", dev->minor);
1540 mutex_unlock(&dev->mutex);
1545 read_subdev = comedi_get_read_subdevice(dev_file_info);
1547 poll_wait(file, &read_subdev->async->wait_head, wait);
1548 if (!read_subdev->busy
1549 || comedi_buf_read_n_available(read_subdev->async) > 0
1550 || !(comedi_get_subdevice_runflags(read_subdev) &
1552 mask |= POLLIN | POLLRDNORM;
1555 write_subdev = comedi_get_write_subdevice(dev_file_info);
1557 poll_wait(file, &write_subdev->async->wait_head, wait);
1558 comedi_buf_write_alloc(write_subdev->async,
1559 write_subdev->async->prealloc_bufsz);
1560 if (!write_subdev->busy
1561 || !(comedi_get_subdevice_runflags(write_subdev) &
1563 || comedi_buf_write_n_allocated(write_subdev->async) >=
1564 bytes_per_sample(write_subdev->async->subdevice)) {
1565 mask |= POLLOUT | POLLWRNORM;
1569 mutex_unlock(&dev->mutex);
1573 static ssize_t comedi_write(struct file *file, const char __user *buf,
1574 size_t nbytes, loff_t *offset)
1576 struct comedi_subdevice *s;
1577 struct comedi_async *async;
1578 int n, m, count = 0, retval = 0;
1579 DECLARE_WAITQUEUE(wait, current);
1580 const unsigned minor = iminor(file->f_dentry->d_inode);
1581 struct comedi_device_file_info *dev_file_info =
1582 comedi_get_device_file_info(minor);
1583 struct comedi_device *dev = dev_file_info->device;
1585 if (!dev->attached) {
1586 DPRINTK("no driver configured on comedi%i\n", dev->minor);
1591 s = comedi_get_write_subdevice(dev_file_info);
1606 if (s->busy != file) {
1610 add_wait_queue(&async->wait_head, &wait);
1611 while (nbytes > 0 && !retval) {
1612 set_current_state(TASK_INTERRUPTIBLE);
1614 if (!(comedi_get_subdevice_runflags(s) & SRF_RUNNING)) {
1616 if (comedi_get_subdevice_runflags(s) &
1622 do_become_nonbusy(dev, s);
1630 if (async->buf_write_ptr + m > async->prealloc_bufsz)
1631 m = async->prealloc_bufsz - async->buf_write_ptr;
1632 comedi_buf_write_alloc(async, async->prealloc_bufsz);
1633 if (m > comedi_buf_write_n_allocated(async))
1634 m = comedi_buf_write_n_allocated(async);
1639 if (file->f_flags & O_NONBLOCK) {
1643 if (signal_pending(current)) {
1644 retval = -ERESTARTSYS;
1650 if (s->busy != file) {
1657 m = copy_from_user(async->prealloc_buf + async->buf_write_ptr,
1663 comedi_buf_write_free(async, n);
1669 break; /* makes device work like a pipe */
1671 set_current_state(TASK_RUNNING);
1672 remove_wait_queue(&async->wait_head, &wait);
1675 return count ? count : retval;
1678 static ssize_t comedi_read(struct file *file, char __user *buf, size_t nbytes,
1681 struct comedi_subdevice *s;
1682 struct comedi_async *async;
1683 int n, m, count = 0, retval = 0;
1684 DECLARE_WAITQUEUE(wait, current);
1685 const unsigned minor = iminor(file->f_dentry->d_inode);
1686 struct comedi_device_file_info *dev_file_info =
1687 comedi_get_device_file_info(minor);
1688 struct comedi_device *dev = dev_file_info->device;
1690 if (!dev->attached) {
1691 DPRINTK("no driver configured on comedi%i\n", dev->minor);
1696 s = comedi_get_read_subdevice(dev_file_info);
1710 if (s->busy != file) {
1715 add_wait_queue(&async->wait_head, &wait);
1716 while (nbytes > 0 && !retval) {
1717 set_current_state(TASK_INTERRUPTIBLE);
1721 m = comedi_buf_read_n_available(async);
1722 /* printk("%d available\n",m); */
1723 if (async->buf_read_ptr + m > async->prealloc_bufsz)
1724 m = async->prealloc_bufsz - async->buf_read_ptr;
1725 /* printk("%d contiguous\n",m); */
1730 if (!(comedi_get_subdevice_runflags(s) & SRF_RUNNING)) {
1731 do_become_nonbusy(dev, s);
1732 if (comedi_get_subdevice_runflags(s) &
1740 if (file->f_flags & O_NONBLOCK) {
1744 if (signal_pending(current)) {
1745 retval = -ERESTARTSYS;
1753 if (s->busy != file) {
1759 m = copy_to_user(buf, async->prealloc_buf +
1760 async->buf_read_ptr, n);
1766 comedi_buf_read_alloc(async, n);
1767 comedi_buf_read_free(async, n);
1773 break; /* makes device work like a pipe */
1775 if (!(comedi_get_subdevice_runflags(s) & (SRF_ERROR | SRF_RUNNING)) &&
1776 async->buf_read_count - async->buf_write_count == 0) {
1777 do_become_nonbusy(dev, s);
1779 set_current_state(TASK_RUNNING);
1780 remove_wait_queue(&async->wait_head, &wait);
1783 return count ? count : retval;
1787 This function restores a subdevice to an idle state.
1789 void do_become_nonbusy(struct comedi_device *dev, struct comedi_subdevice *s)
1791 struct comedi_async *async = s->async;
1793 comedi_set_subdevice_runflags(s, SRF_RUNNING, 0);
1795 comedi_reset_async_buf(async);
1796 async->inttrig = NULL;
1799 "BUG: (?) do_become_nonbusy called with async=0\n");
1805 static int comedi_open(struct inode *inode, struct file *file)
1807 const unsigned minor = iminor(inode);
1808 struct comedi_device_file_info *dev_file_info =
1809 comedi_get_device_file_info(minor);
1810 struct comedi_device *dev =
1811 dev_file_info ? dev_file_info->device : NULL;
1814 DPRINTK("invalid minor number\n");
1818 /* This is slightly hacky, but we want module autoloading
1820 * case: user opens device, attached -> ok
1821 * case: user opens device, unattached, in_request_module=0 -> autoload
1822 * case: user opens device, unattached, in_request_module=1 -> fail
1823 * case: root opens device, attached -> ok
1824 * case: root opens device, unattached, in_request_module=1 -> ok
1825 * (typically called from modprobe)
1826 * case: root opens device, unattached, in_request_module=0 -> autoload
1828 * The last could be changed to "-> ok", which would deny root
1831 mutex_lock(&dev->mutex);
1834 if (!capable(CAP_NET_ADMIN) && dev->in_request_module) {
1835 DPRINTK("in request module\n");
1836 mutex_unlock(&dev->mutex);
1839 if (capable(CAP_NET_ADMIN) && dev->in_request_module)
1842 dev->in_request_module = 1;
1845 mutex_unlock(&dev->mutex);
1846 request_module("char-major-%i-%i", COMEDI_MAJOR, dev->minor);
1847 mutex_lock(&dev->mutex);
1850 dev->in_request_module = 0;
1852 if (!dev->attached && !capable(CAP_NET_ADMIN)) {
1853 DPRINTK("not attached and not CAP_NET_ADMIN\n");
1854 mutex_unlock(&dev->mutex);
1858 __module_get(THIS_MODULE);
1860 if (dev->attached) {
1861 if (!try_module_get(dev->driver->module)) {
1862 module_put(THIS_MODULE);
1863 mutex_unlock(&dev->mutex);
1868 if (dev->attached && dev->use_count == 0 && dev->open) {
1869 int rc = dev->open(dev);
1871 module_put(dev->driver->module);
1872 module_put(THIS_MODULE);
1873 mutex_unlock(&dev->mutex);
1880 mutex_unlock(&dev->mutex);
1885 static int comedi_close(struct inode *inode, struct file *file)
1887 const unsigned minor = iminor(inode);
1888 struct comedi_device_file_info *dev_file_info =
1889 comedi_get_device_file_info(minor);
1890 struct comedi_device *dev = dev_file_info->device;
1891 struct comedi_subdevice *s = NULL;
1894 mutex_lock(&dev->mutex);
1896 if (dev->subdevices) {
1897 for (i = 0; i < dev->n_subdevices; i++) {
1898 s = dev->subdevices + i;
1900 if (s->busy == file)
1902 if (s->lock == file)
1906 if (dev->attached && dev->use_count == 1 && dev->close)
1909 module_put(THIS_MODULE);
1911 module_put(dev->driver->module);
1915 mutex_unlock(&dev->mutex);
1917 if (file->f_flags & FASYNC)
1918 comedi_fasync(-1, file, 0);
1923 static int comedi_fasync(int fd, struct file *file, int on)
1925 const unsigned minor = iminor(file->f_dentry->d_inode);
1926 struct comedi_device_file_info *dev_file_info =
1927 comedi_get_device_file_info(minor);
1929 struct comedi_device *dev = dev_file_info->device;
1931 return fasync_helper(fd, file, on, &dev->async_queue);
1934 const struct file_operations comedi_fops = {
1935 .owner = THIS_MODULE,
1936 .unlocked_ioctl = comedi_unlocked_ioctl,
1937 .compat_ioctl = comedi_compat_ioctl,
1938 .open = comedi_open,
1939 .release = comedi_close,
1940 .read = comedi_read,
1941 .write = comedi_write,
1942 .mmap = comedi_mmap,
1943 .poll = comedi_poll,
1944 .fasync = comedi_fasync,
1945 .llseek = noop_llseek,
1948 struct class *comedi_class;
1949 static struct cdev comedi_cdev;
1951 static void comedi_cleanup_legacy_minors(void)
1955 for (i = 0; i < comedi_num_legacy_minors; i++)
1956 comedi_free_board_minor(i);
1959 static int __init comedi_init(void)
1964 printk(KERN_INFO "comedi: version " COMEDI_RELEASE
1965 " - http://www.comedi.org\n");
1967 if (comedi_num_legacy_minors < 0 ||
1968 comedi_num_legacy_minors > COMEDI_NUM_BOARD_MINORS) {
1969 printk(KERN_ERR "comedi: error: invalid value for module "
1970 "parameter \"comedi_num_legacy_minors\". Valid values "
1971 "are 0 through %i.\n", COMEDI_NUM_BOARD_MINORS);
1976 * comedi is unusable if both comedi_autoconfig and
1977 * comedi_num_legacy_minors are zero, so we might as well adjust the
1978 * defaults in that case
1980 if (comedi_autoconfig == 0 && comedi_num_legacy_minors == 0)
1981 comedi_num_legacy_minors = 16;
1983 memset(comedi_file_info_table, 0,
1984 sizeof(struct comedi_device_file_info *) * COMEDI_NUM_MINORS);
1986 retval = register_chrdev_region(MKDEV(COMEDI_MAJOR, 0),
1987 COMEDI_NUM_MINORS, "comedi");
1990 cdev_init(&comedi_cdev, &comedi_fops);
1991 comedi_cdev.owner = THIS_MODULE;
1992 kobject_set_name(&comedi_cdev.kobj, "comedi");
1993 if (cdev_add(&comedi_cdev, MKDEV(COMEDI_MAJOR, 0), COMEDI_NUM_MINORS)) {
1994 unregister_chrdev_region(MKDEV(COMEDI_MAJOR, 0),
1998 comedi_class = class_create(THIS_MODULE, "comedi");
1999 if (IS_ERR(comedi_class)) {
2000 printk(KERN_ERR "comedi: failed to create class");
2001 cdev_del(&comedi_cdev);
2002 unregister_chrdev_region(MKDEV(COMEDI_MAJOR, 0),
2004 return PTR_ERR(comedi_class);
2007 /* XXX requires /proc interface */
2010 /* create devices files for legacy/manual use */
2011 for (i = 0; i < comedi_num_legacy_minors; i++) {
2013 minor = comedi_alloc_board_minor(NULL);
2015 comedi_cleanup_legacy_minors();
2016 cdev_del(&comedi_cdev);
2017 unregister_chrdev_region(MKDEV(COMEDI_MAJOR, 0),
2026 static void __exit comedi_cleanup(void)
2030 comedi_cleanup_legacy_minors();
2031 for (i = 0; i < COMEDI_NUM_MINORS; ++i)
2032 BUG_ON(comedi_file_info_table[i]);
2034 class_destroy(comedi_class);
2035 cdev_del(&comedi_cdev);
2036 unregister_chrdev_region(MKDEV(COMEDI_MAJOR, 0), COMEDI_NUM_MINORS);
2038 comedi_proc_cleanup();
2041 module_init(comedi_init);
2042 module_exit(comedi_cleanup);
2044 void comedi_error(const struct comedi_device *dev, const char *s)
2046 printk(KERN_ERR "comedi%d: %s: %s\n", dev->minor,
2047 dev->driver->driver_name, s);
2049 EXPORT_SYMBOL(comedi_error);
2051 void comedi_event(struct comedi_device *dev, struct comedi_subdevice *s)
2053 struct comedi_async *async = s->async;
2054 unsigned runflags = 0;
2055 unsigned runflags_mask = 0;
2057 /* DPRINTK("comedi_event 0x%x\n",mask); */
2059 if ((comedi_get_subdevice_runflags(s) & SRF_RUNNING) == 0)
2063 async->events & (COMEDI_CB_EOA | COMEDI_CB_ERROR |
2064 COMEDI_CB_OVERFLOW)) {
2065 runflags_mask |= SRF_RUNNING;
2067 /* remember if an error event has occurred, so an error
2068 * can be returned the next time the user does a read() */
2069 if (s->async->events & (COMEDI_CB_ERROR | COMEDI_CB_OVERFLOW)) {
2070 runflags_mask |= SRF_ERROR;
2071 runflags |= SRF_ERROR;
2073 if (runflags_mask) {
2074 /*sets SRF_ERROR and SRF_RUNNING together atomically */
2075 comedi_set_subdevice_runflags(s, runflags_mask, runflags);
2078 if (async->cb_mask & s->async->events) {
2079 if (comedi_get_subdevice_runflags(s) & SRF_USER) {
2080 wake_up_interruptible(&async->wait_head);
2081 if (s->subdev_flags & SDF_CMD_READ)
2082 kill_fasync(&dev->async_queue, SIGIO, POLL_IN);
2083 if (s->subdev_flags & SDF_CMD_WRITE)
2084 kill_fasync(&dev->async_queue, SIGIO, POLL_OUT);
2087 async->cb_func(s->async->events, async->cb_arg);
2090 s->async->events = 0;
2092 EXPORT_SYMBOL(comedi_event);
2094 unsigned comedi_get_subdevice_runflags(struct comedi_subdevice *s)
2096 unsigned long flags;
2099 spin_lock_irqsave(&s->spin_lock, flags);
2100 runflags = s->runflags;
2101 spin_unlock_irqrestore(&s->spin_lock, flags);
2104 EXPORT_SYMBOL(comedi_get_subdevice_runflags);
2106 static int is_device_busy(struct comedi_device *dev)
2108 struct comedi_subdevice *s;
2114 for (i = 0; i < dev->n_subdevices; i++) {
2115 s = dev->subdevices + i;
2118 if (s->async && s->async->mmap_count)
2125 static void comedi_device_init(struct comedi_device *dev)
2127 memset(dev, 0, sizeof(struct comedi_device));
2128 spin_lock_init(&dev->spinlock);
2129 mutex_init(&dev->mutex);
2133 static void comedi_device_cleanup(struct comedi_device *dev)
2137 mutex_lock(&dev->mutex);
2138 comedi_device_detach(dev);
2139 mutex_unlock(&dev->mutex);
2140 mutex_destroy(&dev->mutex);
2143 int comedi_alloc_board_minor(struct device *hardware_device)
2145 unsigned long flags;
2146 struct comedi_device_file_info *info;
2147 struct device *csdev;
2151 info = kzalloc(sizeof(struct comedi_device_file_info), GFP_KERNEL);
2154 info->device = kzalloc(sizeof(struct comedi_device), GFP_KERNEL);
2155 if (info->device == NULL) {
2159 comedi_device_init(info->device);
2160 spin_lock_irqsave(&comedi_file_info_table_lock, flags);
2161 for (i = 0; i < COMEDI_NUM_BOARD_MINORS; ++i) {
2162 if (comedi_file_info_table[i] == NULL) {
2163 comedi_file_info_table[i] = info;
2167 spin_unlock_irqrestore(&comedi_file_info_table_lock, flags);
2168 if (i == COMEDI_NUM_BOARD_MINORS) {
2169 comedi_device_cleanup(info->device);
2170 kfree(info->device);
2174 "ran out of minor numbers for board device files.\n");
2177 info->device->minor = i;
2178 csdev = device_create(comedi_class, hardware_device,
2179 MKDEV(COMEDI_MAJOR, i), NULL, "comedi%i", i);
2181 info->device->class_dev = csdev;
2182 dev_set_drvdata(csdev, info);
2183 retval = device_create_file(csdev, &dev_attr_max_read_buffer_kb);
2187 "failed to create sysfs attribute file \"%s\".\n",
2188 dev_attr_max_read_buffer_kb.attr.name);
2189 comedi_free_board_minor(i);
2192 retval = device_create_file(csdev, &dev_attr_read_buffer_kb);
2196 "failed to create sysfs attribute file \"%s\".\n",
2197 dev_attr_read_buffer_kb.attr.name);
2198 comedi_free_board_minor(i);
2201 retval = device_create_file(csdev, &dev_attr_max_write_buffer_kb);
2205 "failed to create sysfs attribute file \"%s\".\n",
2206 dev_attr_max_write_buffer_kb.attr.name);
2207 comedi_free_board_minor(i);
2210 retval = device_create_file(csdev, &dev_attr_write_buffer_kb);
2214 "failed to create sysfs attribute file \"%s\".\n",
2215 dev_attr_write_buffer_kb.attr.name);
2216 comedi_free_board_minor(i);
2222 void comedi_free_board_minor(unsigned minor)
2224 unsigned long flags;
2225 struct comedi_device_file_info *info;
2227 BUG_ON(minor >= COMEDI_NUM_BOARD_MINORS);
2228 spin_lock_irqsave(&comedi_file_info_table_lock, flags);
2229 info = comedi_file_info_table[minor];
2230 comedi_file_info_table[minor] = NULL;
2231 spin_unlock_irqrestore(&comedi_file_info_table_lock, flags);
2234 struct comedi_device *dev = info->device;
2236 if (dev->class_dev) {
2237 device_destroy(comedi_class,
2238 MKDEV(COMEDI_MAJOR, dev->minor));
2240 comedi_device_cleanup(dev);
2247 int comedi_alloc_subdevice_minor(struct comedi_device *dev,
2248 struct comedi_subdevice *s)
2250 unsigned long flags;
2251 struct comedi_device_file_info *info;
2252 struct device *csdev;
2256 info = kmalloc(sizeof(struct comedi_device_file_info), GFP_KERNEL);
2260 info->read_subdevice = s;
2261 info->write_subdevice = s;
2262 spin_lock_irqsave(&comedi_file_info_table_lock, flags);
2263 for (i = COMEDI_FIRST_SUBDEVICE_MINOR; i < COMEDI_NUM_MINORS; ++i) {
2264 if (comedi_file_info_table[i] == NULL) {
2265 comedi_file_info_table[i] = info;
2269 spin_unlock_irqrestore(&comedi_file_info_table_lock, flags);
2270 if (i == COMEDI_NUM_MINORS) {
2274 "ran out of minor numbers for board device files.\n");
2278 csdev = device_create(comedi_class, dev->class_dev,
2279 MKDEV(COMEDI_MAJOR, i), NULL, "comedi%i_subd%i",
2280 dev->minor, (int)(s - dev->subdevices));
2282 s->class_dev = csdev;
2283 dev_set_drvdata(csdev, info);
2284 retval = device_create_file(csdev, &dev_attr_max_read_buffer_kb);
2288 "failed to create sysfs attribute file \"%s\".\n",
2289 dev_attr_max_read_buffer_kb.attr.name);
2290 comedi_free_subdevice_minor(s);
2293 retval = device_create_file(csdev, &dev_attr_read_buffer_kb);
2297 "failed to create sysfs attribute file \"%s\".\n",
2298 dev_attr_read_buffer_kb.attr.name);
2299 comedi_free_subdevice_minor(s);
2302 retval = device_create_file(csdev, &dev_attr_max_write_buffer_kb);
2306 "failed to create sysfs attribute file \"%s\".\n",
2307 dev_attr_max_write_buffer_kb.attr.name);
2308 comedi_free_subdevice_minor(s);
2311 retval = device_create_file(csdev, &dev_attr_write_buffer_kb);
2315 "failed to create sysfs attribute file \"%s\".\n",
2316 dev_attr_write_buffer_kb.attr.name);
2317 comedi_free_subdevice_minor(s);
2323 void comedi_free_subdevice_minor(struct comedi_subdevice *s)
2325 unsigned long flags;
2326 struct comedi_device_file_info *info;
2333 BUG_ON(s->minor >= COMEDI_NUM_MINORS);
2334 BUG_ON(s->minor < COMEDI_FIRST_SUBDEVICE_MINOR);
2336 spin_lock_irqsave(&comedi_file_info_table_lock, flags);
2337 info = comedi_file_info_table[s->minor];
2338 comedi_file_info_table[s->minor] = NULL;
2339 spin_unlock_irqrestore(&comedi_file_info_table_lock, flags);
2342 device_destroy(comedi_class, MKDEV(COMEDI_MAJOR, s->minor));
2343 s->class_dev = NULL;
2348 struct comedi_device_file_info *comedi_get_device_file_info(unsigned minor)
2350 unsigned long flags;
2351 struct comedi_device_file_info *info;
2353 BUG_ON(minor >= COMEDI_NUM_MINORS);
2354 spin_lock_irqsave(&comedi_file_info_table_lock, flags);
2355 info = comedi_file_info_table[minor];
2356 spin_unlock_irqrestore(&comedi_file_info_table_lock, flags);
2359 EXPORT_SYMBOL_GPL(comedi_get_device_file_info);
2361 static int resize_async_buffer(struct comedi_device *dev,
2362 struct comedi_subdevice *s,
2363 struct comedi_async *async, unsigned new_size)
2367 if (new_size > async->max_bufsize)
2371 DPRINTK("subdevice is busy, cannot resize buffer\n");
2374 if (async->mmap_count) {
2375 DPRINTK("subdevice is mmapped, cannot resize buffer\n");
2379 if (!async->prealloc_buf)
2382 /* make sure buffer is an integral number of pages
2384 new_size = (new_size + PAGE_SIZE - 1) & PAGE_MASK;
2386 retval = comedi_buf_alloc(dev, s, new_size);
2390 if (s->buf_change) {
2391 retval = s->buf_change(dev, s, new_size);
2396 DPRINTK("comedi%i subd %d buffer resized to %i bytes\n",
2397 dev->minor, (int)(s - dev->subdevices), async->prealloc_bufsz);
2401 /* sysfs attribute files */
2403 static const unsigned bytes_per_kibi = 1024;
2405 static ssize_t show_max_read_buffer_kb(struct device *dev,
2406 struct device_attribute *attr, char *buf)
2409 struct comedi_device_file_info *info = dev_get_drvdata(dev);
2410 unsigned max_buffer_size_kb = 0;
2411 struct comedi_subdevice *const read_subdevice =
2412 comedi_get_read_subdevice(info);
2414 mutex_lock(&info->device->mutex);
2415 if (read_subdevice &&
2416 (read_subdevice->subdev_flags & SDF_CMD_READ) &&
2417 read_subdevice->async) {
2418 max_buffer_size_kb = read_subdevice->async->max_bufsize /
2421 retval = snprintf(buf, PAGE_SIZE, "%i\n", max_buffer_size_kb);
2422 mutex_unlock(&info->device->mutex);
2427 static ssize_t store_max_read_buffer_kb(struct device *dev,
2428 struct device_attribute *attr,
2429 const char *buf, size_t count)
2431 struct comedi_device_file_info *info = dev_get_drvdata(dev);
2432 unsigned long new_max_size_kb;
2433 uint64_t new_max_size;
2434 struct comedi_subdevice *const read_subdevice =
2435 comedi_get_read_subdevice(info);
2437 if (strict_strtoul(buf, 10, &new_max_size_kb))
2439 if (new_max_size_kb != (uint32_t) new_max_size_kb)
2441 new_max_size = ((uint64_t) new_max_size_kb) * bytes_per_kibi;
2442 if (new_max_size != (uint32_t) new_max_size)
2445 mutex_lock(&info->device->mutex);
2446 if (read_subdevice == NULL ||
2447 (read_subdevice->subdev_flags & SDF_CMD_READ) == 0 ||
2448 read_subdevice->async == NULL) {
2449 mutex_unlock(&info->device->mutex);
2452 read_subdevice->async->max_bufsize = new_max_size;
2453 mutex_unlock(&info->device->mutex);
2458 static struct device_attribute dev_attr_max_read_buffer_kb = {
2460 .name = "max_read_buffer_kb",
2461 .mode = S_IRUGO | S_IWUSR},
2462 .show = &show_max_read_buffer_kb,
2463 .store = &store_max_read_buffer_kb
2466 static ssize_t show_read_buffer_kb(struct device *dev,
2467 struct device_attribute *attr, char *buf)
2470 struct comedi_device_file_info *info = dev_get_drvdata(dev);
2471 unsigned buffer_size_kb = 0;
2472 struct comedi_subdevice *const read_subdevice =
2473 comedi_get_read_subdevice(info);
2475 mutex_lock(&info->device->mutex);
2476 if (read_subdevice &&
2477 (read_subdevice->subdev_flags & SDF_CMD_READ) &&
2478 read_subdevice->async) {
2479 buffer_size_kb = read_subdevice->async->prealloc_bufsz /
2482 retval = snprintf(buf, PAGE_SIZE, "%i\n", buffer_size_kb);
2483 mutex_unlock(&info->device->mutex);
2488 static ssize_t store_read_buffer_kb(struct device *dev,
2489 struct device_attribute *attr,
2490 const char *buf, size_t count)
2492 struct comedi_device_file_info *info = dev_get_drvdata(dev);
2493 unsigned long new_size_kb;
2496 struct comedi_subdevice *const read_subdevice =
2497 comedi_get_read_subdevice(info);
2499 if (strict_strtoul(buf, 10, &new_size_kb))
2501 if (new_size_kb != (uint32_t) new_size_kb)
2503 new_size = ((uint64_t) new_size_kb) * bytes_per_kibi;
2504 if (new_size != (uint32_t) new_size)
2507 mutex_lock(&info->device->mutex);
2508 if (read_subdevice == NULL ||
2509 (read_subdevice->subdev_flags & SDF_CMD_READ) == 0 ||
2510 read_subdevice->async == NULL) {
2511 mutex_unlock(&info->device->mutex);
2514 retval = resize_async_buffer(info->device, read_subdevice,
2515 read_subdevice->async, new_size);
2516 mutex_unlock(&info->device->mutex);
2523 static struct device_attribute dev_attr_read_buffer_kb = {
2525 .name = "read_buffer_kb",
2526 .mode = S_IRUGO | S_IWUSR | S_IWGRP},
2527 .show = &show_read_buffer_kb,
2528 .store = &store_read_buffer_kb
2531 static ssize_t show_max_write_buffer_kb(struct device *dev,
2532 struct device_attribute *attr,
2536 struct comedi_device_file_info *info = dev_get_drvdata(dev);
2537 unsigned max_buffer_size_kb = 0;
2538 struct comedi_subdevice *const write_subdevice =
2539 comedi_get_write_subdevice(info);
2541 mutex_lock(&info->device->mutex);
2542 if (write_subdevice &&
2543 (write_subdevice->subdev_flags & SDF_CMD_WRITE) &&
2544 write_subdevice->async) {
2545 max_buffer_size_kb = write_subdevice->async->max_bufsize /
2548 retval = snprintf(buf, PAGE_SIZE, "%i\n", max_buffer_size_kb);
2549 mutex_unlock(&info->device->mutex);
2554 static ssize_t store_max_write_buffer_kb(struct device *dev,
2555 struct device_attribute *attr,
2556 const char *buf, size_t count)
2558 struct comedi_device_file_info *info = dev_get_drvdata(dev);
2559 unsigned long new_max_size_kb;
2560 uint64_t new_max_size;
2561 struct comedi_subdevice *const write_subdevice =
2562 comedi_get_write_subdevice(info);
2564 if (strict_strtoul(buf, 10, &new_max_size_kb))
2566 if (new_max_size_kb != (uint32_t) new_max_size_kb)
2568 new_max_size = ((uint64_t) new_max_size_kb) * bytes_per_kibi;
2569 if (new_max_size != (uint32_t) new_max_size)
2572 mutex_lock(&info->device->mutex);
2573 if (write_subdevice == NULL ||
2574 (write_subdevice->subdev_flags & SDF_CMD_WRITE) == 0 ||
2575 write_subdevice->async == NULL) {
2576 mutex_unlock(&info->device->mutex);
2579 write_subdevice->async->max_bufsize = new_max_size;
2580 mutex_unlock(&info->device->mutex);
2585 static struct device_attribute dev_attr_max_write_buffer_kb = {
2587 .name = "max_write_buffer_kb",
2588 .mode = S_IRUGO | S_IWUSR},
2589 .show = &show_max_write_buffer_kb,
2590 .store = &store_max_write_buffer_kb
2593 static ssize_t show_write_buffer_kb(struct device *dev,
2594 struct device_attribute *attr, char *buf)
2597 struct comedi_device_file_info *info = dev_get_drvdata(dev);
2598 unsigned buffer_size_kb = 0;
2599 struct comedi_subdevice *const write_subdevice =
2600 comedi_get_write_subdevice(info);
2602 mutex_lock(&info->device->mutex);
2603 if (write_subdevice &&
2604 (write_subdevice->subdev_flags & SDF_CMD_WRITE) &&
2605 write_subdevice->async) {
2606 buffer_size_kb = write_subdevice->async->prealloc_bufsz /
2609 retval = snprintf(buf, PAGE_SIZE, "%i\n", buffer_size_kb);
2610 mutex_unlock(&info->device->mutex);
2615 static ssize_t store_write_buffer_kb(struct device *dev,
2616 struct device_attribute *attr,
2617 const char *buf, size_t count)
2619 struct comedi_device_file_info *info = dev_get_drvdata(dev);
2620 unsigned long new_size_kb;
2623 struct comedi_subdevice *const write_subdevice =
2624 comedi_get_write_subdevice(info);
2626 if (strict_strtoul(buf, 10, &new_size_kb))
2628 if (new_size_kb != (uint32_t) new_size_kb)
2630 new_size = ((uint64_t) new_size_kb) * bytes_per_kibi;
2631 if (new_size != (uint32_t) new_size)
2634 mutex_lock(&info->device->mutex);
2635 if (write_subdevice == NULL ||
2636 (write_subdevice->subdev_flags & SDF_CMD_WRITE) == 0 ||
2637 write_subdevice->async == NULL) {
2638 mutex_unlock(&info->device->mutex);
2641 retval = resize_async_buffer(info->device, write_subdevice,
2642 write_subdevice->async, new_size);
2643 mutex_unlock(&info->device->mutex);
2650 static struct device_attribute dev_attr_write_buffer_kb = {
2652 .name = "write_buffer_kb",
2653 .mode = S_IRUGO | S_IWUSR | S_IWGRP},
2654 .show = &show_write_buffer_kb,
2655 .store = &store_write_buffer_kb