5 COMEDI - Linux Control and Measurement Device Interface
6 Copyright (C) 1997-2000 David A. Schleef <ds@schleef.org>
8 This program is free software; you can redistribute it and/or modify
9 it under the terms of the GNU General Public License as published by
10 the Free Software Foundation; either version 2 of the License, or
11 (at your option) any later version.
13 This program is distributed in the hope that it will be useful,
14 but WITHOUT ANY WARRANTY; without even the implied warranty of
15 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
16 GNU General Public License for more details.
18 You should have received a copy of the GNU General Public License
19 along with this program; if not, write to the Free Software
20 Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
26 #define __NO_VERSION__
27 #include "comedi_fops.h"
28 #include "comedi_compat32.h"
30 #include <linux/module.h>
31 #include <linux/errno.h>
32 #include <linux/kernel.h>
33 #include <linux/sched.h>
34 #include <linux/fcntl.h>
35 #include <linux/delay.h>
36 #include <linux/ioport.h>
38 #include <linux/slab.h>
39 #include <linux/kmod.h>
40 #include <linux/poll.h>
41 #include <linux/init.h>
42 #include <linux/device.h>
43 #include <linux/vmalloc.h>
45 #include "comedidev.h"
46 #include <linux/cdev.h>
47 #include <linux/stat.h>
50 #include <linux/uaccess.h>
54 MODULE_AUTHOR("http://www.comedi.org");
55 MODULE_DESCRIPTION("Comedi core module");
56 MODULE_LICENSE("GPL");
58 #ifdef CONFIG_COMEDI_DEBUG
60 EXPORT_SYMBOL(comedi_debug);
61 module_param(comedi_debug, int, 0644);
64 int comedi_autoconfig = 1;
65 module_param(comedi_autoconfig, bool, 0444);
67 static int comedi_num_legacy_minors;
68 module_param(comedi_num_legacy_minors, int, 0444);
70 static DEFINE_SPINLOCK(comedi_file_info_table_lock);
71 static struct comedi_device_file_info
72 *comedi_file_info_table[COMEDI_NUM_MINORS];
74 static int do_devconfig_ioctl(struct comedi_device *dev,
75 struct comedi_devconfig __user *arg);
76 static int do_bufconfig_ioctl(struct comedi_device *dev,
77 struct comedi_bufconfig __user *arg);
78 static int do_devinfo_ioctl(struct comedi_device *dev,
79 struct comedi_devinfo __user *arg,
81 static int do_subdinfo_ioctl(struct comedi_device *dev,
82 struct comedi_subdinfo __user *arg, void *file);
83 static int do_chaninfo_ioctl(struct comedi_device *dev,
84 struct comedi_chaninfo __user *arg);
85 static int do_bufinfo_ioctl(struct comedi_device *dev,
86 struct comedi_bufinfo __user *arg, void *file);
87 static int do_cmd_ioctl(struct comedi_device *dev,
88 struct comedi_cmd __user *arg, void *file);
89 static int do_lock_ioctl(struct comedi_device *dev, unsigned int arg,
91 static int do_unlock_ioctl(struct comedi_device *dev, unsigned int arg,
93 static int do_cancel_ioctl(struct comedi_device *dev, unsigned int arg,
95 static int do_cmdtest_ioctl(struct comedi_device *dev,
96 struct comedi_cmd __user *arg, void *file);
97 static int do_insnlist_ioctl(struct comedi_device *dev,
98 struct comedi_insnlist __user *arg, void *file);
99 static int do_insn_ioctl(struct comedi_device *dev,
100 struct comedi_insn __user *arg, void *file);
101 static int do_poll_ioctl(struct comedi_device *dev, unsigned int subd,
104 extern void do_become_nonbusy(struct comedi_device *dev,
105 struct comedi_subdevice *s);
106 static int do_cancel(struct comedi_device *dev, struct comedi_subdevice *s);
108 static int comedi_fasync(int fd, struct file *file, int on);
110 static int is_device_busy(struct comedi_device *dev);
111 static int resize_async_buffer(struct comedi_device *dev,
112 struct comedi_subdevice *s,
113 struct comedi_async *async, unsigned new_size);
115 /* declarations for sysfs attribute files */
116 static struct device_attribute dev_attr_max_read_buffer_kb;
117 static struct device_attribute dev_attr_read_buffer_kb;
118 static struct device_attribute dev_attr_max_write_buffer_kb;
119 static struct device_attribute dev_attr_write_buffer_kb;
121 static long comedi_unlocked_ioctl(struct file *file, unsigned int cmd,
124 const unsigned minor = iminor(file->f_dentry->d_inode);
125 struct comedi_device_file_info *dev_file_info =
126 comedi_get_device_file_info(minor);
127 struct comedi_device *dev;
130 if (dev_file_info == NULL || dev_file_info->device == NULL)
132 dev = dev_file_info->device;
134 mutex_lock(&dev->mutex);
136 /* Device config is special, because it must work on
137 * an unconfigured device. */
138 if (cmd == COMEDI_DEVCONFIG) {
139 rc = do_devconfig_ioctl(dev,
140 (struct comedi_devconfig __user *)arg);
144 if (!dev->attached) {
145 DPRINTK("no driver configured on /dev/comedi%i\n", dev->minor);
151 case COMEDI_BUFCONFIG:
152 rc = do_bufconfig_ioctl(dev,
153 (struct comedi_bufconfig __user *)arg);
156 rc = do_devinfo_ioctl(dev, (struct comedi_devinfo __user *)arg,
159 case COMEDI_SUBDINFO:
160 rc = do_subdinfo_ioctl(dev,
161 (struct comedi_subdinfo __user *)arg,
164 case COMEDI_CHANINFO:
165 rc = do_chaninfo_ioctl(dev, (void __user *)arg);
167 case COMEDI_RANGEINFO:
168 rc = do_rangeinfo_ioctl(dev, (void __user *)arg);
171 rc = do_bufinfo_ioctl(dev,
172 (struct comedi_bufinfo __user *)arg,
176 rc = do_lock_ioctl(dev, arg, file);
179 rc = do_unlock_ioctl(dev, arg, file);
182 rc = do_cancel_ioctl(dev, arg, file);
185 rc = do_cmd_ioctl(dev, (struct comedi_cmd __user *)arg, file);
188 rc = do_cmdtest_ioctl(dev, (struct comedi_cmd __user *)arg,
191 case COMEDI_INSNLIST:
192 rc = do_insnlist_ioctl(dev,
193 (struct comedi_insnlist __user *)arg,
197 rc = do_insn_ioctl(dev, (struct comedi_insn __user *)arg,
201 rc = do_poll_ioctl(dev, arg, file);
209 mutex_unlock(&dev->mutex);
218 pointer to devconfig structure
221 devconfig structure at arg
226 static int do_devconfig_ioctl(struct comedi_device *dev,
227 struct comedi_devconfig __user *arg)
229 struct comedi_devconfig it;
231 unsigned char *aux_data = NULL;
234 if (!capable(CAP_SYS_ADMIN))
238 if (is_device_busy(dev))
241 struct module *driver_module = dev->driver->module;
242 comedi_device_detach(dev);
243 module_put(driver_module);
248 if (copy_from_user(&it, arg, sizeof(struct comedi_devconfig)))
251 it.board_name[COMEDI_NAMELEN - 1] = 0;
253 if (comedi_aux_data(it.options, 0) &&
254 it.options[COMEDI_DEVCONF_AUX_DATA_LENGTH]) {
256 aux_len = it.options[COMEDI_DEVCONF_AUX_DATA_LENGTH];
260 aux_data = vmalloc(aux_len);
264 if (copy_from_user(aux_data,
265 comedi_aux_data(it.options, 0), aux_len)) {
269 it.options[COMEDI_DEVCONF_AUX_DATA_LO] =
270 (unsigned long)aux_data;
271 if (sizeof(void *) > sizeof(int)) {
272 bit_shift = sizeof(int) * 8;
273 it.options[COMEDI_DEVCONF_AUX_DATA_HI] =
274 ((unsigned long)aux_data) >> bit_shift;
276 it.options[COMEDI_DEVCONF_AUX_DATA_HI] = 0;
279 ret = comedi_device_attach(dev, &it);
281 if (!try_module_get(dev->driver->module)) {
282 comedi_device_detach(dev);
295 buffer configuration ioctl
298 pointer to bufconfig structure
304 modified bufconfig at arg
307 static int do_bufconfig_ioctl(struct comedi_device *dev,
308 struct comedi_bufconfig __user *arg)
310 struct comedi_bufconfig bc;
311 struct comedi_async *async;
312 struct comedi_subdevice *s;
315 if (copy_from_user(&bc, arg, sizeof(struct comedi_bufconfig)))
318 if (bc.subdevice >= dev->n_subdevices || bc.subdevice < 0)
321 s = dev->subdevices + bc.subdevice;
325 DPRINTK("subdevice does not have async capability\n");
331 if (bc.maximum_size) {
332 if (!capable(CAP_SYS_ADMIN))
335 async->max_bufsize = bc.maximum_size;
339 retval = resize_async_buffer(dev, s, async, bc.size);
344 bc.size = async->prealloc_bufsz;
345 bc.maximum_size = async->max_bufsize;
348 if (copy_to_user(arg, &bc, sizeof(struct comedi_bufconfig)))
359 pointer to devinfo structure
368 static int do_devinfo_ioctl(struct comedi_device *dev,
369 struct comedi_devinfo __user *arg,
372 struct comedi_devinfo devinfo;
373 const unsigned minor = iminor(file->f_dentry->d_inode);
374 struct comedi_device_file_info *dev_file_info =
375 comedi_get_device_file_info(minor);
376 struct comedi_subdevice *read_subdev =
377 comedi_get_read_subdevice(dev_file_info);
378 struct comedi_subdevice *write_subdev =
379 comedi_get_write_subdevice(dev_file_info);
381 memset(&devinfo, 0, sizeof(devinfo));
383 /* fill devinfo structure */
384 devinfo.version_code = COMEDI_VERSION_CODE;
385 devinfo.n_subdevs = dev->n_subdevices;
386 memcpy(devinfo.driver_name, dev->driver->driver_name, COMEDI_NAMELEN);
387 memcpy(devinfo.board_name, dev->board_name, COMEDI_NAMELEN);
390 devinfo.read_subdevice = read_subdev - dev->subdevices;
392 devinfo.read_subdevice = -1;
395 devinfo.write_subdevice = write_subdev - dev->subdevices;
397 devinfo.write_subdevice = -1;
399 if (copy_to_user(arg, &devinfo, sizeof(struct comedi_devinfo)))
410 pointer to array of subdevice info structures
416 array of subdevice info structures at arg
419 static int do_subdinfo_ioctl(struct comedi_device *dev,
420 struct comedi_subdinfo __user *arg, void *file)
423 struct comedi_subdinfo *tmp, *us;
424 struct comedi_subdevice *s;
427 kcalloc(dev->n_subdevices, sizeof(struct comedi_subdinfo),
432 /* fill subdinfo structs */
433 for (i = 0; i < dev->n_subdevices; i++) {
434 s = dev->subdevices + i;
438 us->n_chan = s->n_chan;
439 us->subd_flags = s->subdev_flags;
440 if (comedi_get_subdevice_runflags(s) & SRF_RUNNING)
441 us->subd_flags |= SDF_RUNNING;
442 #define TIMER_nanosec 5 /* backwards compatibility */
443 us->timer_type = TIMER_nanosec;
444 us->len_chanlist = s->len_chanlist;
445 us->maxdata = s->maxdata;
446 if (s->range_table) {
448 (i << 24) | (0 << 16) | (s->range_table->length);
450 us->range_type = 0; /* XXX */
452 us->flags = s->flags;
455 us->subd_flags |= SDF_BUSY;
457 us->subd_flags |= SDF_BUSY_OWNER;
459 us->subd_flags |= SDF_LOCKED;
461 us->subd_flags |= SDF_LOCK_OWNER;
462 if (!s->maxdata && s->maxdata_list)
463 us->subd_flags |= SDF_MAXDATA;
465 us->subd_flags |= SDF_FLAGS;
466 if (s->range_table_list)
467 us->subd_flags |= SDF_RANGETYPE;
469 us->subd_flags |= SDF_CMD;
471 if (s->insn_bits != &insn_inval)
472 us->insn_bits_support = COMEDI_SUPPORTED;
474 us->insn_bits_support = COMEDI_UNSUPPORTED;
476 us->settling_time_0 = s->settling_time_0;
479 ret = copy_to_user(arg, tmp,
480 dev->n_subdevices * sizeof(struct comedi_subdinfo));
484 return ret ? -EFAULT : 0;
492 pointer to chaninfo structure
495 chaninfo structure at arg
498 arrays at elements of chaninfo structure
501 static int do_chaninfo_ioctl(struct comedi_device *dev,
502 struct comedi_chaninfo __user *arg)
504 struct comedi_subdevice *s;
505 struct comedi_chaninfo it;
507 if (copy_from_user(&it, arg, sizeof(struct comedi_chaninfo)))
510 if (it.subdev >= dev->n_subdevices)
512 s = dev->subdevices + it.subdev;
514 if (it.maxdata_list) {
515 if (s->maxdata || !s->maxdata_list)
517 if (copy_to_user(it.maxdata_list, s->maxdata_list,
518 s->n_chan * sizeof(unsigned int)))
525 if (copy_to_user(it.flaglist, s->flaglist,
526 s->n_chan * sizeof(unsigned int)))
533 if (!s->range_table_list)
535 for (i = 0; i < s->n_chan; i++) {
538 x = (dev->minor << 28) | (it.subdev << 24) | (i << 16) |
539 (s->range_table_list[i]->length);
540 if (put_user(x, it.rangelist + i))
544 if (copy_to_user(it.rangelist, s->range_type_list,
545 s->n_chan * sizeof(unsigned int)))
555 buffer information ioctl
558 pointer to bufinfo structure
564 modified bufinfo at arg
567 static int do_bufinfo_ioctl(struct comedi_device *dev,
568 struct comedi_bufinfo __user *arg, void *file)
570 struct comedi_bufinfo bi;
571 struct comedi_subdevice *s;
572 struct comedi_async *async;
574 if (copy_from_user(&bi, arg, sizeof(struct comedi_bufinfo)))
577 if (bi.subdevice >= dev->n_subdevices || bi.subdevice < 0)
580 s = dev->subdevices + bi.subdevice;
582 if (s->lock && s->lock != file)
588 DPRINTK("subdevice does not have async capability\n");
589 bi.buf_write_ptr = 0;
591 bi.buf_write_count = 0;
592 bi.buf_read_count = 0;
594 bi.bytes_written = 0;
599 bi.bytes_written = 0;
600 goto copyback_position;
605 if (bi.bytes_read && (s->subdev_flags & SDF_CMD_READ)) {
606 bi.bytes_read = comedi_buf_read_alloc(async, bi.bytes_read);
607 comedi_buf_read_free(async, bi.bytes_read);
609 if (!(comedi_get_subdevice_runflags(s) & (SRF_ERROR |
611 && async->buf_write_count == async->buf_read_count) {
612 do_become_nonbusy(dev, s);
616 if (bi.bytes_written && (s->subdev_flags & SDF_CMD_WRITE)) {
618 comedi_buf_write_alloc(async, bi.bytes_written);
619 comedi_buf_write_free(async, bi.bytes_written);
623 bi.buf_write_count = async->buf_write_count;
624 bi.buf_write_ptr = async->buf_write_ptr;
625 bi.buf_read_count = async->buf_read_count;
626 bi.buf_read_ptr = async->buf_read_ptr;
629 if (copy_to_user(arg, &bi, sizeof(struct comedi_bufinfo)))
635 static int parse_insn(struct comedi_device *dev, struct comedi_insn *insn,
636 unsigned int *data, void *file);
639 * synchronous instructions
642 * pointer to sync cmd structure
645 * sync cmd struct at arg
652 /* arbitrary limits */
653 #define MAX_SAMPLES 256
654 static int do_insnlist_ioctl(struct comedi_device *dev,
655 struct comedi_insnlist __user *arg, void *file)
657 struct comedi_insnlist insnlist;
658 struct comedi_insn *insns = NULL;
659 unsigned int *data = NULL;
663 if (copy_from_user(&insnlist, arg, sizeof(struct comedi_insnlist)))
666 data = kmalloc(sizeof(unsigned int) * MAX_SAMPLES, GFP_KERNEL);
668 DPRINTK("kmalloc failed\n");
674 kmalloc(sizeof(struct comedi_insn) * insnlist.n_insns, GFP_KERNEL);
676 DPRINTK("kmalloc failed\n");
681 if (copy_from_user(insns, insnlist.insns,
682 sizeof(struct comedi_insn) * insnlist.n_insns)) {
683 DPRINTK("copy_from_user failed\n");
688 for (i = 0; i < insnlist.n_insns; i++) {
689 if (insns[i].n > MAX_SAMPLES) {
690 DPRINTK("number of samples too large\n");
694 if (insns[i].insn & INSN_MASK_WRITE) {
695 if (copy_from_user(data, insns[i].data,
696 insns[i].n * sizeof(unsigned int))) {
697 DPRINTK("copy_from_user failed\n");
702 ret = parse_insn(dev, insns + i, data, file);
705 if (insns[i].insn & INSN_MASK_READ) {
706 if (copy_to_user(insns[i].data, data,
707 insns[i].n * sizeof(unsigned int))) {
708 DPRINTK("copy_to_user failed\n");
726 static int check_insn_config_length(struct comedi_insn *insn,
733 case INSN_CONFIG_DIO_OUTPUT:
734 case INSN_CONFIG_DIO_INPUT:
735 case INSN_CONFIG_DISARM:
736 case INSN_CONFIG_RESET:
740 case INSN_CONFIG_ARM:
741 case INSN_CONFIG_DIO_QUERY:
742 case INSN_CONFIG_BLOCK_SIZE:
743 case INSN_CONFIG_FILTER:
744 case INSN_CONFIG_SERIAL_CLOCK:
745 case INSN_CONFIG_BIDIRECTIONAL_DATA:
746 case INSN_CONFIG_ALT_SOURCE:
747 case INSN_CONFIG_SET_COUNTER_MODE:
748 case INSN_CONFIG_8254_READ_STATUS:
749 case INSN_CONFIG_SET_ROUTING:
750 case INSN_CONFIG_GET_ROUTING:
751 case INSN_CONFIG_GET_PWM_STATUS:
752 case INSN_CONFIG_PWM_SET_PERIOD:
753 case INSN_CONFIG_PWM_GET_PERIOD:
757 case INSN_CONFIG_SET_GATE_SRC:
758 case INSN_CONFIG_GET_GATE_SRC:
759 case INSN_CONFIG_SET_CLOCK_SRC:
760 case INSN_CONFIG_GET_CLOCK_SRC:
761 case INSN_CONFIG_SET_OTHER_SRC:
762 case INSN_CONFIG_GET_COUNTER_STATUS:
763 case INSN_CONFIG_PWM_SET_H_BRIDGE:
764 case INSN_CONFIG_PWM_GET_H_BRIDGE:
765 case INSN_CONFIG_GET_HARDWARE_BUFFER_SIZE:
769 case INSN_CONFIG_PWM_OUTPUT:
770 case INSN_CONFIG_ANALOG_TRIG:
774 /* by default we allow the insn since we don't have checks for
775 * all possible cases yet */
778 "comedi: no check for data length of config insn id "
779 "%i is implemented.\n"
780 " Add a check to %s in %s.\n"
781 " Assuming n=%i is correct.\n", data[0], __func__,
789 static int parse_insn(struct comedi_device *dev, struct comedi_insn *insn,
790 unsigned int *data, void *file)
792 struct comedi_subdevice *s;
796 if (insn->insn & INSN_MASK_SPECIAL) {
797 /* a non-subdevice instruction */
799 switch (insn->insn) {
809 do_gettimeofday(&tv);
811 data[1] = tv.tv_usec;
817 if (insn->n != 1 || data[0] >= 100000) {
821 udelay(data[0] / 1000);
829 if (insn->subdev >= dev->n_subdevices) {
830 DPRINTK("%d not usable subdevice\n",
835 s = dev->subdevices + insn->subdev;
837 DPRINTK("no async\n");
841 if (!s->async->inttrig) {
842 DPRINTK("no inttrig\n");
846 ret = s->async->inttrig(dev, s, insn->data[0]);
851 DPRINTK("invalid insn\n");
856 /* a subdevice instruction */
857 unsigned int maxdata;
859 if (insn->subdev >= dev->n_subdevices) {
860 DPRINTK("subdevice %d out of range\n", insn->subdev);
864 s = dev->subdevices + insn->subdev;
866 if (s->type == COMEDI_SUBD_UNUSED) {
867 DPRINTK("%d not usable subdevice\n", insn->subdev);
872 /* are we locked? (ioctl lock) */
873 if (s->lock && s->lock != file) {
874 DPRINTK("device locked\n");
879 ret = comedi_check_chanlist(s, 1, &insn->chanspec);
882 DPRINTK("bad chanspec\n");
890 /* This looks arbitrary. It is. */
891 s->busy = &parse_insn;
892 switch (insn->insn) {
894 ret = s->insn_read(dev, s, insn, data);
897 maxdata = s->maxdata_list
898 ? s->maxdata_list[CR_CHAN(insn->chanspec)]
900 for (i = 0; i < insn->n; ++i) {
901 if (data[i] > maxdata) {
903 DPRINTK("bad data value(s)\n");
908 ret = s->insn_write(dev, s, insn, data);
915 ret = s->insn_bits(dev, s, insn, data);
918 ret = check_insn_config_length(insn, data);
921 ret = s->insn_config(dev, s, insn, data);
937 * synchronous instructions
943 * struct comedi_insn struct at arg
949 static int do_insn_ioctl(struct comedi_device *dev,
950 struct comedi_insn __user *arg, void *file)
952 struct comedi_insn insn;
953 unsigned int *data = NULL;
956 data = kmalloc(sizeof(unsigned int) * MAX_SAMPLES, GFP_KERNEL);
962 if (copy_from_user(&insn, arg, sizeof(struct comedi_insn))) {
967 /* This is where the behavior of insn and insnlist deviate. */
968 if (insn.n > MAX_SAMPLES)
969 insn.n = MAX_SAMPLES;
970 if (insn.insn & INSN_MASK_WRITE) {
971 if (copy_from_user(data,
973 insn.n * sizeof(unsigned int))) {
978 ret = parse_insn(dev, &insn, data, file);
981 if (insn.insn & INSN_MASK_READ) {
982 if (copy_to_user(insn.data,
984 insn.n * sizeof(unsigned int))) {
997 static void comedi_set_subdevice_runflags(struct comedi_subdevice *s,
998 unsigned mask, unsigned bits)
1000 unsigned long flags;
1002 spin_lock_irqsave(&s->spin_lock, flags);
1003 s->runflags &= ~mask;
1004 s->runflags |= (bits & mask);
1005 spin_unlock_irqrestore(&s->spin_lock, flags);
1008 static int do_cmd_ioctl(struct comedi_device *dev,
1009 struct comedi_cmd __user *cmd, void *file)
1011 struct comedi_cmd user_cmd;
1012 struct comedi_subdevice *s;
1013 struct comedi_async *async;
1015 unsigned int __user *chanlist_saver = NULL;
1017 if (copy_from_user(&user_cmd, cmd, sizeof(struct comedi_cmd))) {
1018 DPRINTK("bad cmd address\n");
1021 /* save user's chanlist pointer so it can be restored later */
1022 chanlist_saver = user_cmd.chanlist;
1024 if (user_cmd.subdev >= dev->n_subdevices) {
1025 DPRINTK("%d no such subdevice\n", user_cmd.subdev);
1029 s = dev->subdevices + user_cmd.subdev;
1032 if (s->type == COMEDI_SUBD_UNUSED) {
1033 DPRINTK("%d not valid subdevice\n", user_cmd.subdev);
1037 if (!s->do_cmd || !s->do_cmdtest || !s->async) {
1038 DPRINTK("subdevice %i does not support commands\n",
1043 /* are we locked? (ioctl lock) */
1044 if (s->lock && s->lock != file) {
1045 DPRINTK("subdevice locked\n");
1051 DPRINTK("subdevice busy\n");
1056 /* make sure channel/gain list isn't too long */
1057 if (user_cmd.chanlist_len > s->len_chanlist) {
1058 DPRINTK("channel/gain list too long %u > %d\n",
1059 user_cmd.chanlist_len, s->len_chanlist);
1064 /* make sure channel/gain list isn't too short */
1065 if (user_cmd.chanlist_len < 1) {
1066 DPRINTK("channel/gain list too short %u < 1\n",
1067 user_cmd.chanlist_len);
1072 kfree(async->cmd.chanlist);
1073 async->cmd = user_cmd;
1074 async->cmd.data = NULL;
1075 /* load channel/gain list */
1076 async->cmd.chanlist =
1077 kmalloc(async->cmd.chanlist_len * sizeof(int), GFP_KERNEL);
1078 if (!async->cmd.chanlist) {
1079 DPRINTK("allocation failed\n");
1084 if (copy_from_user(async->cmd.chanlist, user_cmd.chanlist,
1085 async->cmd.chanlist_len * sizeof(int))) {
1086 DPRINTK("fault reading chanlist\n");
1091 /* make sure each element in channel/gain list is valid */
1092 ret = comedi_check_chanlist(s,
1093 async->cmd.chanlist_len,
1094 async->cmd.chanlist);
1096 DPRINTK("bad chanlist\n");
1100 ret = s->do_cmdtest(dev, s, &async->cmd);
1102 if (async->cmd.flags & TRIG_BOGUS || ret) {
1103 DPRINTK("test returned %d\n", ret);
1104 user_cmd = async->cmd;
1105 /* restore chanlist pointer before copying back */
1106 user_cmd.chanlist = chanlist_saver;
1107 user_cmd.data = NULL;
1108 if (copy_to_user(cmd, &user_cmd, sizeof(struct comedi_cmd))) {
1109 DPRINTK("fault writing cmd\n");
1117 if (!async->prealloc_bufsz) {
1119 DPRINTK("no buffer (?)\n");
1123 comedi_reset_async_buf(async);
1126 COMEDI_CB_EOA | COMEDI_CB_BLOCK | COMEDI_CB_ERROR |
1128 if (async->cmd.flags & TRIG_WAKE_EOS)
1129 async->cb_mask |= COMEDI_CB_EOS;
1131 comedi_set_subdevice_runflags(s, ~0, SRF_USER | SRF_RUNNING);
1133 ret = s->do_cmd(dev, s);
1138 do_become_nonbusy(dev, s);
1145 command testing ioctl
1148 pointer to cmd structure
1151 cmd structure at arg
1155 modified cmd structure at arg
1158 static int do_cmdtest_ioctl(struct comedi_device *dev,
1159 struct comedi_cmd __user *arg, void *file)
1161 struct comedi_cmd user_cmd;
1162 struct comedi_subdevice *s;
1164 unsigned int *chanlist = NULL;
1165 unsigned int __user *chanlist_saver = NULL;
1167 if (copy_from_user(&user_cmd, arg, sizeof(struct comedi_cmd))) {
1168 DPRINTK("bad cmd address\n");
1171 /* save user's chanlist pointer so it can be restored later */
1172 chanlist_saver = user_cmd.chanlist;
1174 if (user_cmd.subdev >= dev->n_subdevices) {
1175 DPRINTK("%d no such subdevice\n", user_cmd.subdev);
1179 s = dev->subdevices + user_cmd.subdev;
1180 if (s->type == COMEDI_SUBD_UNUSED) {
1181 DPRINTK("%d not valid subdevice\n", user_cmd.subdev);
1185 if (!s->do_cmd || !s->do_cmdtest) {
1186 DPRINTK("subdevice %i does not support commands\n",
1191 /* make sure channel/gain list isn't too long */
1192 if (user_cmd.chanlist_len > s->len_chanlist) {
1193 DPRINTK("channel/gain list too long %d > %d\n",
1194 user_cmd.chanlist_len, s->len_chanlist);
1199 /* load channel/gain list */
1200 if (user_cmd.chanlist) {
1202 kmalloc(user_cmd.chanlist_len * sizeof(int), GFP_KERNEL);
1204 DPRINTK("allocation failed\n");
1209 if (copy_from_user(chanlist, user_cmd.chanlist,
1210 user_cmd.chanlist_len * sizeof(int))) {
1211 DPRINTK("fault reading chanlist\n");
1216 /* make sure each element in channel/gain list is valid */
1217 ret = comedi_check_chanlist(s, user_cmd.chanlist_len, chanlist);
1219 DPRINTK("bad chanlist\n");
1223 user_cmd.chanlist = chanlist;
1226 ret = s->do_cmdtest(dev, s, &user_cmd);
1228 /* restore chanlist pointer before copying back */
1229 user_cmd.chanlist = chanlist_saver;
1231 if (copy_to_user(arg, &user_cmd, sizeof(struct comedi_cmd))) {
1232 DPRINTK("bad cmd address\n");
1257 static int do_lock_ioctl(struct comedi_device *dev, unsigned int arg,
1261 unsigned long flags;
1262 struct comedi_subdevice *s;
1264 if (arg >= dev->n_subdevices)
1266 s = dev->subdevices + arg;
1268 spin_lock_irqsave(&s->spin_lock, flags);
1269 if (s->busy || s->lock)
1273 spin_unlock_irqrestore(&s->spin_lock, flags);
1280 ret = s->lock_f(dev, s);
1299 This function isn't protected by the semaphore, since
1300 we already own the lock.
1302 static int do_unlock_ioctl(struct comedi_device *dev, unsigned int arg,
1305 struct comedi_subdevice *s;
1307 if (arg >= dev->n_subdevices)
1309 s = dev->subdevices + arg;
1314 if (s->lock && s->lock != file)
1317 if (s->lock == file) {
1331 cancel acquisition ioctl
1343 static int do_cancel_ioctl(struct comedi_device *dev, unsigned int arg,
1346 struct comedi_subdevice *s;
1348 if (arg >= dev->n_subdevices)
1350 s = dev->subdevices + arg;
1351 if (s->async == NULL)
1354 if (s->lock && s->lock != file)
1360 if (s->busy != file)
1363 return do_cancel(dev, s);
1368 instructs driver to synchronize buffers
1380 static int do_poll_ioctl(struct comedi_device *dev, unsigned int arg,
1383 struct comedi_subdevice *s;
1385 if (arg >= dev->n_subdevices)
1387 s = dev->subdevices + arg;
1389 if (s->lock && s->lock != file)
1395 if (s->busy != file)
1399 return s->poll(dev, s);
1404 static int do_cancel(struct comedi_device *dev, struct comedi_subdevice *s)
1408 if ((comedi_get_subdevice_runflags(s) & SRF_RUNNING) && s->cancel)
1409 ret = s->cancel(dev, s);
1411 do_become_nonbusy(dev, s);
1416 static void comedi_unmap(struct vm_area_struct *area)
1418 struct comedi_async *async;
1419 struct comedi_device *dev;
1421 async = area->vm_private_data;
1422 dev = async->subdevice->device;
1424 mutex_lock(&dev->mutex);
1425 async->mmap_count--;
1426 mutex_unlock(&dev->mutex);
1429 static struct vm_operations_struct comedi_vm_ops = {
1430 .close = comedi_unmap,
1433 static int comedi_mmap(struct file *file, struct vm_area_struct *vma)
1435 const unsigned minor = iminor(file->f_dentry->d_inode);
1436 struct comedi_device_file_info *dev_file_info =
1437 comedi_get_device_file_info(minor);
1438 struct comedi_device *dev = dev_file_info->device;
1439 struct comedi_async *async = NULL;
1440 unsigned long start = vma->vm_start;
1445 struct comedi_subdevice *s;
1447 mutex_lock(&dev->mutex);
1448 if (!dev->attached) {
1449 DPRINTK("no driver configured on comedi%i\n", dev->minor);
1453 if (vma->vm_flags & VM_WRITE)
1454 s = comedi_get_write_subdevice(dev_file_info);
1456 s = comedi_get_read_subdevice(dev_file_info);
1463 if (async == NULL) {
1468 if (vma->vm_pgoff != 0) {
1469 DPRINTK("comedi: mmap() offset must be 0.\n");
1474 size = vma->vm_end - vma->vm_start;
1475 if (size > async->prealloc_bufsz) {
1479 if (size & (~PAGE_MASK)) {
1484 n_pages = size >> PAGE_SHIFT;
1485 for (i = 0; i < n_pages; ++i) {
1486 if (remap_pfn_range(vma, start,
1487 page_to_pfn(virt_to_page
1488 (async->buf_page_list
1489 [i].virt_addr)), PAGE_SIZE,
1497 vma->vm_ops = &comedi_vm_ops;
1498 vma->vm_private_data = async;
1500 async->mmap_count++;
1504 mutex_unlock(&dev->mutex);
1508 static unsigned int comedi_poll(struct file *file, poll_table * wait)
1510 unsigned int mask = 0;
1511 const unsigned minor = iminor(file->f_dentry->d_inode);
1512 struct comedi_device_file_info *dev_file_info =
1513 comedi_get_device_file_info(minor);
1514 struct comedi_device *dev = dev_file_info->device;
1515 struct comedi_subdevice *read_subdev;
1516 struct comedi_subdevice *write_subdev;
1518 mutex_lock(&dev->mutex);
1519 if (!dev->attached) {
1520 DPRINTK("no driver configured on comedi%i\n", dev->minor);
1521 mutex_unlock(&dev->mutex);
1526 read_subdev = comedi_get_read_subdevice(dev_file_info);
1528 poll_wait(file, &read_subdev->async->wait_head, wait);
1529 if (!read_subdev->busy
1530 || comedi_buf_read_n_available(read_subdev->async) > 0
1531 || !(comedi_get_subdevice_runflags(read_subdev) &
1533 mask |= POLLIN | POLLRDNORM;
1536 write_subdev = comedi_get_write_subdevice(dev_file_info);
1538 poll_wait(file, &write_subdev->async->wait_head, wait);
1539 comedi_buf_write_alloc(write_subdev->async,
1540 write_subdev->async->prealloc_bufsz);
1541 if (!write_subdev->busy
1542 || !(comedi_get_subdevice_runflags(write_subdev) &
1544 || comedi_buf_write_n_allocated(write_subdev->async) >=
1545 bytes_per_sample(write_subdev->async->subdevice)) {
1546 mask |= POLLOUT | POLLWRNORM;
1550 mutex_unlock(&dev->mutex);
1554 static ssize_t comedi_write(struct file *file, const char __user *buf,
1555 size_t nbytes, loff_t *offset)
1557 struct comedi_subdevice *s;
1558 struct comedi_async *async;
1559 int n, m, count = 0, retval = 0;
1560 DECLARE_WAITQUEUE(wait, current);
1561 const unsigned minor = iminor(file->f_dentry->d_inode);
1562 struct comedi_device_file_info *dev_file_info =
1563 comedi_get_device_file_info(minor);
1564 struct comedi_device *dev = dev_file_info->device;
1566 if (!dev->attached) {
1567 DPRINTK("no driver configured on comedi%i\n", dev->minor);
1572 s = comedi_get_write_subdevice(dev_file_info);
1587 if (s->busy != file) {
1591 add_wait_queue(&async->wait_head, &wait);
1592 while (nbytes > 0 && !retval) {
1593 set_current_state(TASK_INTERRUPTIBLE);
1595 if (!(comedi_get_subdevice_runflags(s) & SRF_RUNNING)) {
1597 if (comedi_get_subdevice_runflags(s) &
1603 do_become_nonbusy(dev, s);
1611 if (async->buf_write_ptr + m > async->prealloc_bufsz)
1612 m = async->prealloc_bufsz - async->buf_write_ptr;
1613 comedi_buf_write_alloc(async, async->prealloc_bufsz);
1614 if (m > comedi_buf_write_n_allocated(async))
1615 m = comedi_buf_write_n_allocated(async);
1620 if (file->f_flags & O_NONBLOCK) {
1624 if (signal_pending(current)) {
1625 retval = -ERESTARTSYS;
1631 if (s->busy != file) {
1638 m = copy_from_user(async->prealloc_buf + async->buf_write_ptr,
1644 comedi_buf_write_free(async, n);
1650 break; /* makes device work like a pipe */
1652 set_current_state(TASK_RUNNING);
1653 remove_wait_queue(&async->wait_head, &wait);
1656 return count ? count : retval;
1659 static ssize_t comedi_read(struct file *file, char __user *buf, size_t nbytes,
1662 struct comedi_subdevice *s;
1663 struct comedi_async *async;
1664 int n, m, count = 0, retval = 0;
1665 DECLARE_WAITQUEUE(wait, current);
1666 const unsigned minor = iminor(file->f_dentry->d_inode);
1667 struct comedi_device_file_info *dev_file_info =
1668 comedi_get_device_file_info(minor);
1669 struct comedi_device *dev = dev_file_info->device;
1671 if (!dev->attached) {
1672 DPRINTK("no driver configured on comedi%i\n", dev->minor);
1677 s = comedi_get_read_subdevice(dev_file_info);
1691 if (s->busy != file) {
1696 add_wait_queue(&async->wait_head, &wait);
1697 while (nbytes > 0 && !retval) {
1698 set_current_state(TASK_INTERRUPTIBLE);
1702 m = comedi_buf_read_n_available(async);
1703 /* printk("%d available\n",m); */
1704 if (async->buf_read_ptr + m > async->prealloc_bufsz)
1705 m = async->prealloc_bufsz - async->buf_read_ptr;
1706 /* printk("%d contiguous\n",m); */
1711 if (!(comedi_get_subdevice_runflags(s) & SRF_RUNNING)) {
1712 do_become_nonbusy(dev, s);
1713 if (comedi_get_subdevice_runflags(s) &
1721 if (file->f_flags & O_NONBLOCK) {
1725 if (signal_pending(current)) {
1726 retval = -ERESTARTSYS;
1734 if (s->busy != file) {
1740 m = copy_to_user(buf, async->prealloc_buf +
1741 async->buf_read_ptr, n);
1747 comedi_buf_read_alloc(async, n);
1748 comedi_buf_read_free(async, n);
1754 break; /* makes device work like a pipe */
1756 if (!(comedi_get_subdevice_runflags(s) & (SRF_ERROR | SRF_RUNNING)) &&
1757 async->buf_read_count - async->buf_write_count == 0) {
1758 do_become_nonbusy(dev, s);
1760 set_current_state(TASK_RUNNING);
1761 remove_wait_queue(&async->wait_head, &wait);
1764 return count ? count : retval;
1768 This function restores a subdevice to an idle state.
1770 void do_become_nonbusy(struct comedi_device *dev, struct comedi_subdevice *s)
1772 struct comedi_async *async = s->async;
1774 comedi_set_subdevice_runflags(s, SRF_RUNNING, 0);
1776 comedi_reset_async_buf(async);
1777 async->inttrig = NULL;
1780 "BUG: (?) do_become_nonbusy called with async=0\n");
1786 static int comedi_open(struct inode *inode, struct file *file)
1788 const unsigned minor = iminor(inode);
1789 struct comedi_device_file_info *dev_file_info =
1790 comedi_get_device_file_info(minor);
1791 struct comedi_device *dev =
1792 dev_file_info ? dev_file_info->device : NULL;
1795 DPRINTK("invalid minor number\n");
1799 /* This is slightly hacky, but we want module autoloading
1801 * case: user opens device, attached -> ok
1802 * case: user opens device, unattached, in_request_module=0 -> autoload
1803 * case: user opens device, unattached, in_request_module=1 -> fail
1804 * case: root opens device, attached -> ok
1805 * case: root opens device, unattached, in_request_module=1 -> ok
1806 * (typically called from modprobe)
1807 * case: root opens device, unattached, in_request_module=0 -> autoload
1809 * The last could be changed to "-> ok", which would deny root
1812 mutex_lock(&dev->mutex);
1815 if (!capable(CAP_NET_ADMIN) && dev->in_request_module) {
1816 DPRINTK("in request module\n");
1817 mutex_unlock(&dev->mutex);
1820 if (capable(CAP_NET_ADMIN) && dev->in_request_module)
1823 dev->in_request_module = 1;
1826 mutex_unlock(&dev->mutex);
1827 request_module("char-major-%i-%i", COMEDI_MAJOR, dev->minor);
1828 mutex_lock(&dev->mutex);
1831 dev->in_request_module = 0;
1833 if (!dev->attached && !capable(CAP_NET_ADMIN)) {
1834 DPRINTK("not attached and not CAP_NET_ADMIN\n");
1835 mutex_unlock(&dev->mutex);
1839 __module_get(THIS_MODULE);
1841 if (dev->attached) {
1842 if (!try_module_get(dev->driver->module)) {
1843 module_put(THIS_MODULE);
1844 mutex_unlock(&dev->mutex);
1849 if (dev->attached && dev->use_count == 0 && dev->open) {
1850 int rc = dev->open(dev);
1852 module_put(dev->driver->module);
1853 module_put(THIS_MODULE);
1854 mutex_unlock(&dev->mutex);
1861 mutex_unlock(&dev->mutex);
1866 static int comedi_close(struct inode *inode, struct file *file)
1868 const unsigned minor = iminor(inode);
1869 struct comedi_device_file_info *dev_file_info =
1870 comedi_get_device_file_info(minor);
1871 struct comedi_device *dev = dev_file_info->device;
1872 struct comedi_subdevice *s = NULL;
1875 mutex_lock(&dev->mutex);
1877 if (dev->subdevices) {
1878 for (i = 0; i < dev->n_subdevices; i++) {
1879 s = dev->subdevices + i;
1881 if (s->busy == file)
1883 if (s->lock == file)
1887 if (dev->attached && dev->use_count == 1 && dev->close)
1890 module_put(THIS_MODULE);
1892 module_put(dev->driver->module);
1896 mutex_unlock(&dev->mutex);
1898 if (file->f_flags & FASYNC)
1899 comedi_fasync(-1, file, 0);
1904 static int comedi_fasync(int fd, struct file *file, int on)
1906 const unsigned minor = iminor(file->f_dentry->d_inode);
1907 struct comedi_device_file_info *dev_file_info =
1908 comedi_get_device_file_info(minor);
1910 struct comedi_device *dev = dev_file_info->device;
1912 return fasync_helper(fd, file, on, &dev->async_queue);
1915 const struct file_operations comedi_fops = {
1916 .owner = THIS_MODULE,
1917 .unlocked_ioctl = comedi_unlocked_ioctl,
1918 .compat_ioctl = comedi_compat_ioctl,
1919 .open = comedi_open,
1920 .release = comedi_close,
1921 .read = comedi_read,
1922 .write = comedi_write,
1923 .mmap = comedi_mmap,
1924 .poll = comedi_poll,
1925 .fasync = comedi_fasync,
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