5 COMEDI - Linux Control and Measurement Device Interface
6 Copyright (C) 1997-2000 David A. Schleef <ds@schleef.org>
8 This program is free software; you can redistribute it and/or modify
9 it under the terms of the GNU General Public License as published by
10 the Free Software Foundation; either version 2 of the License, or
11 (at your option) any later version.
13 This program is distributed in the hope that it will be useful,
14 but WITHOUT ANY WARRANTY; without even the implied warranty of
15 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
16 GNU General Public License for more details.
18 You should have received a copy of the GNU General Public License
19 along with this program; if not, write to the Free Software
20 Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
26 #include "comedi_compat32.h"
28 #include <linux/module.h>
29 #include <linux/errno.h>
30 #include <linux/kernel.h>
31 #include <linux/sched.h>
32 #include <linux/fcntl.h>
33 #include <linux/delay.h>
34 #include <linux/ioport.h>
36 #include <linux/slab.h>
37 #include <linux/kmod.h>
38 #include <linux/poll.h>
39 #include <linux/init.h>
40 #include <linux/device.h>
41 #include <linux/vmalloc.h>
43 #include "comedidev.h"
44 #include <linux/cdev.h>
45 #include <linux/stat.h>
48 #include <linux/uaccess.h>
50 #include "comedi_internal.h"
52 #ifdef CONFIG_COMEDI_DEBUG
54 EXPORT_SYMBOL(comedi_debug);
55 module_param(comedi_debug, int, S_IRUGO | S_IWUSR);
56 MODULE_PARM_DESC(comedi_debug,
57 "enable comedi core and driver debugging if non-zero (default 0)"
61 static int comedi_num_legacy_minors;
62 module_param(comedi_num_legacy_minors, int, S_IRUGO);
63 MODULE_PARM_DESC(comedi_num_legacy_minors,
64 "number of comedi minor devices to reserve for non-auto-configured devices (default 0)"
67 unsigned int comedi_default_buf_size_kb = CONFIG_COMEDI_DEFAULT_BUF_SIZE_KB;
68 module_param(comedi_default_buf_size_kb, uint, S_IRUGO | S_IWUSR);
69 MODULE_PARM_DESC(comedi_default_buf_size_kb,
70 "default asynchronous buffer size in KiB (default "
71 __MODULE_STRING(CONFIG_COMEDI_DEFAULT_BUF_SIZE_KB) ")");
73 unsigned int comedi_default_buf_maxsize_kb
74 = CONFIG_COMEDI_DEFAULT_BUF_MAXSIZE_KB;
75 module_param(comedi_default_buf_maxsize_kb, uint, S_IRUGO | S_IWUSR);
76 MODULE_PARM_DESC(comedi_default_buf_maxsize_kb,
77 "default maximum size of asynchronous buffer in KiB (default "
78 __MODULE_STRING(CONFIG_COMEDI_DEFAULT_BUF_MAXSIZE_KB) ")");
80 struct comedi_file_info {
81 struct comedi_device *device;
82 struct comedi_subdevice *read_subdevice;
83 struct comedi_subdevice *write_subdevice;
84 struct device *hardware_device;
87 static DEFINE_SPINLOCK(comedi_file_info_table_lock);
88 static struct comedi_file_info *comedi_file_info_table[COMEDI_NUM_MINORS];
90 static struct comedi_file_info *comedi_file_info_from_minor(unsigned minor)
92 struct comedi_file_info *info;
94 BUG_ON(minor >= COMEDI_NUM_MINORS);
95 spin_lock(&comedi_file_info_table_lock);
96 info = comedi_file_info_table[minor];
97 spin_unlock(&comedi_file_info_table_lock);
101 static struct comedi_device *
102 comedi_dev_from_file_info(struct comedi_file_info *info)
104 return info ? info->device : NULL;
107 struct comedi_device *comedi_dev_from_minor(unsigned minor)
109 return comedi_dev_from_file_info(comedi_file_info_from_minor(minor));
111 EXPORT_SYMBOL_GPL(comedi_dev_from_minor);
113 static struct comedi_subdevice *
114 comedi_read_subdevice(const struct comedi_file_info *info)
116 if (info->read_subdevice)
117 return info->read_subdevice;
119 return info->device->read_subdev;
123 static struct comedi_subdevice *
124 comedi_write_subdevice(const struct comedi_file_info *info)
126 if (info->write_subdevice)
127 return info->write_subdevice;
129 return info->device->write_subdev;
133 static int resize_async_buffer(struct comedi_device *dev,
134 struct comedi_subdevice *s,
135 struct comedi_async *async, unsigned new_size)
139 if (new_size > async->max_bufsize)
143 DPRINTK("subdevice is busy, cannot resize buffer\n");
146 if (async->mmap_count) {
147 DPRINTK("subdevice is mmapped, cannot resize buffer\n");
151 if (!async->prealloc_buf)
154 /* make sure buffer is an integral number of pages
156 new_size = (new_size + PAGE_SIZE - 1) & PAGE_MASK;
158 retval = comedi_buf_alloc(dev, s, new_size);
163 retval = s->buf_change(dev, s, new_size);
168 DPRINTK("comedi%i subd %d buffer resized to %i bytes\n",
169 dev->minor, s->index, async->prealloc_bufsz);
173 /* sysfs attribute files */
175 static ssize_t show_max_read_buffer_kb(struct device *dev,
176 struct device_attribute *attr, char *buf)
178 struct comedi_file_info *info = dev_get_drvdata(dev);
179 struct comedi_subdevice *s = comedi_read_subdevice(info);
180 unsigned int size = 0;
182 mutex_lock(&info->device->mutex);
183 if (s && (s->subdev_flags & SDF_CMD_READ) && s->async)
184 size = s->async->max_bufsize / 1024;
185 mutex_unlock(&info->device->mutex);
187 return snprintf(buf, PAGE_SIZE, "%i\n", size);
190 static ssize_t store_max_read_buffer_kb(struct device *dev,
191 struct device_attribute *attr,
192 const char *buf, size_t count)
194 struct comedi_file_info *info = dev_get_drvdata(dev);
195 struct comedi_subdevice *s = comedi_read_subdevice(info);
199 err = kstrtouint(buf, 10, &size);
202 if (size > (UINT_MAX / 1024))
206 mutex_lock(&info->device->mutex);
207 if (s && (s->subdev_flags & SDF_CMD_READ) && s->async)
208 s->async->max_bufsize = size;
211 mutex_unlock(&info->device->mutex);
213 return err ? err : count;
216 static ssize_t show_read_buffer_kb(struct device *dev,
217 struct device_attribute *attr, char *buf)
219 struct comedi_file_info *info = dev_get_drvdata(dev);
220 struct comedi_subdevice *s = comedi_read_subdevice(info);
221 unsigned int size = 0;
223 mutex_lock(&info->device->mutex);
224 if (s && (s->subdev_flags & SDF_CMD_READ) && s->async)
225 size = s->async->prealloc_bufsz / 1024;
226 mutex_unlock(&info->device->mutex);
228 return snprintf(buf, PAGE_SIZE, "%i\n", size);
231 static ssize_t store_read_buffer_kb(struct device *dev,
232 struct device_attribute *attr,
233 const char *buf, size_t count)
235 struct comedi_file_info *info = dev_get_drvdata(dev);
236 struct comedi_subdevice *s = comedi_read_subdevice(info);
240 err = kstrtouint(buf, 10, &size);
243 if (size > (UINT_MAX / 1024))
247 mutex_lock(&info->device->mutex);
248 if (s && (s->subdev_flags & SDF_CMD_READ) && s->async)
249 err = resize_async_buffer(info->device, s, s->async, size);
252 mutex_unlock(&info->device->mutex);
254 return err ? err : count;
257 static ssize_t show_max_write_buffer_kb(struct device *dev,
258 struct device_attribute *attr,
261 struct comedi_file_info *info = dev_get_drvdata(dev);
262 struct comedi_subdevice *s = comedi_write_subdevice(info);
263 unsigned int size = 0;
265 mutex_lock(&info->device->mutex);
266 if (s && (s->subdev_flags & SDF_CMD_WRITE) && s->async)
267 size = s->async->max_bufsize / 1024;
268 mutex_unlock(&info->device->mutex);
270 return snprintf(buf, PAGE_SIZE, "%i\n", size);
273 static ssize_t store_max_write_buffer_kb(struct device *dev,
274 struct device_attribute *attr,
275 const char *buf, size_t count)
277 struct comedi_file_info *info = dev_get_drvdata(dev);
278 struct comedi_subdevice *s = comedi_write_subdevice(info);
282 err = kstrtouint(buf, 10, &size);
285 if (size > (UINT_MAX / 1024))
289 mutex_lock(&info->device->mutex);
290 if (s && (s->subdev_flags & SDF_CMD_WRITE) && s->async)
291 s->async->max_bufsize = size;
294 mutex_unlock(&info->device->mutex);
296 return err ? err : count;
299 static ssize_t show_write_buffer_kb(struct device *dev,
300 struct device_attribute *attr, char *buf)
302 struct comedi_file_info *info = dev_get_drvdata(dev);
303 struct comedi_subdevice *s = comedi_write_subdevice(info);
304 unsigned int size = 0;
306 mutex_lock(&info->device->mutex);
307 if (s && (s->subdev_flags & SDF_CMD_WRITE) && s->async)
308 size = s->async->prealloc_bufsz / 1024;
309 mutex_unlock(&info->device->mutex);
311 return snprintf(buf, PAGE_SIZE, "%i\n", size);
314 static ssize_t store_write_buffer_kb(struct device *dev,
315 struct device_attribute *attr,
316 const char *buf, size_t count)
318 struct comedi_file_info *info = dev_get_drvdata(dev);
319 struct comedi_subdevice *s = comedi_write_subdevice(info);
323 err = kstrtouint(buf, 10, &size);
326 if (size > (UINT_MAX / 1024))
330 mutex_lock(&info->device->mutex);
331 if (s && (s->subdev_flags & SDF_CMD_WRITE) && s->async)
332 err = resize_async_buffer(info->device, s, s->async, size);
335 mutex_unlock(&info->device->mutex);
337 return err ? err : count;
340 static struct device_attribute comedi_dev_attrs[] = {
341 __ATTR(max_read_buffer_kb, S_IRUGO | S_IWUSR,
342 show_max_read_buffer_kb, store_max_read_buffer_kb),
343 __ATTR(read_buffer_kb, S_IRUGO | S_IWUSR | S_IWGRP,
344 show_read_buffer_kb, store_read_buffer_kb),
345 __ATTR(max_write_buffer_kb, S_IRUGO | S_IWUSR,
346 show_max_write_buffer_kb, store_max_write_buffer_kb),
347 __ATTR(write_buffer_kb, S_IRUGO | S_IWUSR | S_IWGRP,
348 show_write_buffer_kb, store_write_buffer_kb),
352 static void comedi_set_subdevice_runflags(struct comedi_subdevice *s,
353 unsigned mask, unsigned bits)
357 spin_lock_irqsave(&s->spin_lock, flags);
358 s->runflags &= ~mask;
359 s->runflags |= (bits & mask);
360 spin_unlock_irqrestore(&s->spin_lock, flags);
363 static unsigned comedi_get_subdevice_runflags(struct comedi_subdevice *s)
368 spin_lock_irqsave(&s->spin_lock, flags);
369 runflags = s->runflags;
370 spin_unlock_irqrestore(&s->spin_lock, flags);
374 bool comedi_is_subdevice_running(struct comedi_subdevice *s)
376 unsigned runflags = comedi_get_subdevice_runflags(s);
378 return (runflags & SRF_RUNNING) ? true : false;
380 EXPORT_SYMBOL_GPL(comedi_is_subdevice_running);
382 static bool comedi_is_subdevice_in_error(struct comedi_subdevice *s)
384 unsigned runflags = comedi_get_subdevice_runflags(s);
386 return (runflags & SRF_ERROR) ? true : false;
389 static bool comedi_is_subdevice_idle(struct comedi_subdevice *s)
391 unsigned runflags = comedi_get_subdevice_runflags(s);
393 return (runflags & (SRF_ERROR | SRF_RUNNING)) ? false : true;
397 This function restores a subdevice to an idle state.
399 static void do_become_nonbusy(struct comedi_device *dev,
400 struct comedi_subdevice *s)
402 struct comedi_async *async = s->async;
404 comedi_set_subdevice_runflags(s, SRF_RUNNING, 0);
406 comedi_buf_reset(async);
407 async->inttrig = NULL;
408 kfree(async->cmd.chanlist);
409 async->cmd.chanlist = NULL;
411 dev_err(dev->class_dev,
412 "BUG: (?) do_become_nonbusy called with async=NULL\n");
418 static int do_cancel(struct comedi_device *dev, struct comedi_subdevice *s)
422 if (comedi_is_subdevice_running(s) && s->cancel)
423 ret = s->cancel(dev, s);
425 do_become_nonbusy(dev, s);
430 static int is_device_busy(struct comedi_device *dev)
432 struct comedi_subdevice *s;
438 for (i = 0; i < dev->n_subdevices; i++) {
439 s = &dev->subdevices[i];
442 if (s->async && s->async->mmap_count)
454 pointer to devconfig structure
457 devconfig structure at arg
462 static int do_devconfig_ioctl(struct comedi_device *dev,
463 struct comedi_devconfig __user *arg)
465 struct comedi_devconfig it;
468 if (!capable(CAP_SYS_ADMIN))
472 if (is_device_busy(dev))
475 struct module *driver_module = dev->driver->module;
476 comedi_device_detach(dev);
477 module_put(driver_module);
482 if (copy_from_user(&it, arg, sizeof(it)))
485 it.board_name[COMEDI_NAMELEN - 1] = 0;
487 if (it.options[COMEDI_DEVCONF_AUX_DATA_LENGTH]) {
488 dev_warn(dev->class_dev,
489 "comedi_config --init_data is deprecated\n");
493 ret = comedi_device_attach(dev, &it);
495 if (!try_module_get(dev->driver->module)) {
496 comedi_device_detach(dev);
506 buffer configuration ioctl
509 pointer to bufconfig structure
515 modified bufconfig at arg
518 static int do_bufconfig_ioctl(struct comedi_device *dev,
519 struct comedi_bufconfig __user *arg)
521 struct comedi_bufconfig bc;
522 struct comedi_async *async;
523 struct comedi_subdevice *s;
526 if (copy_from_user(&bc, arg, sizeof(bc)))
529 if (bc.subdevice >= dev->n_subdevices || bc.subdevice < 0)
532 s = &dev->subdevices[bc.subdevice];
536 DPRINTK("subdevice does not have async capability\n");
542 if (bc.maximum_size) {
543 if (!capable(CAP_SYS_ADMIN))
546 async->max_bufsize = bc.maximum_size;
550 retval = resize_async_buffer(dev, s, async, bc.size);
555 bc.size = async->prealloc_bufsz;
556 bc.maximum_size = async->max_bufsize;
559 if (copy_to_user(arg, &bc, sizeof(bc)))
570 pointer to devinfo structure
579 static int do_devinfo_ioctl(struct comedi_device *dev,
580 struct comedi_devinfo __user *arg,
583 const unsigned minor = iminor(file_inode(file));
584 struct comedi_file_info *info = comedi_file_info_from_minor(minor);
585 struct comedi_subdevice *s;
586 struct comedi_devinfo devinfo;
588 memset(&devinfo, 0, sizeof(devinfo));
590 /* fill devinfo structure */
591 devinfo.version_code = COMEDI_VERSION_CODE;
592 devinfo.n_subdevs = dev->n_subdevices;
593 strlcpy(devinfo.driver_name, dev->driver->driver_name, COMEDI_NAMELEN);
594 strlcpy(devinfo.board_name, dev->board_name, COMEDI_NAMELEN);
596 s = comedi_read_subdevice(info);
598 devinfo.read_subdevice = s->index;
600 devinfo.read_subdevice = -1;
602 s = comedi_write_subdevice(info);
604 devinfo.write_subdevice = s->index;
606 devinfo.write_subdevice = -1;
608 if (copy_to_user(arg, &devinfo, sizeof(devinfo)))
619 pointer to array of subdevice info structures
625 array of subdevice info structures at arg
628 static int do_subdinfo_ioctl(struct comedi_device *dev,
629 struct comedi_subdinfo __user *arg, void *file)
632 struct comedi_subdinfo *tmp, *us;
633 struct comedi_subdevice *s;
635 tmp = kcalloc(dev->n_subdevices, sizeof(*tmp), GFP_KERNEL);
639 /* fill subdinfo structs */
640 for (i = 0; i < dev->n_subdevices; i++) {
641 s = &dev->subdevices[i];
645 us->n_chan = s->n_chan;
646 us->subd_flags = s->subdev_flags;
647 if (comedi_is_subdevice_running(s))
648 us->subd_flags |= SDF_RUNNING;
649 #define TIMER_nanosec 5 /* backwards compatibility */
650 us->timer_type = TIMER_nanosec;
651 us->len_chanlist = s->len_chanlist;
652 us->maxdata = s->maxdata;
653 if (s->range_table) {
655 (i << 24) | (0 << 16) | (s->range_table->length);
657 us->range_type = 0; /* XXX */
659 us->flags = s->flags;
662 us->subd_flags |= SDF_BUSY;
664 us->subd_flags |= SDF_BUSY_OWNER;
666 us->subd_flags |= SDF_LOCKED;
668 us->subd_flags |= SDF_LOCK_OWNER;
669 if (!s->maxdata && s->maxdata_list)
670 us->subd_flags |= SDF_MAXDATA;
672 us->subd_flags |= SDF_FLAGS;
673 if (s->range_table_list)
674 us->subd_flags |= SDF_RANGETYPE;
676 us->subd_flags |= SDF_CMD;
678 if (s->insn_bits != &insn_inval)
679 us->insn_bits_support = COMEDI_SUPPORTED;
681 us->insn_bits_support = COMEDI_UNSUPPORTED;
683 us->settling_time_0 = s->settling_time_0;
686 ret = copy_to_user(arg, tmp, dev->n_subdevices * sizeof(*tmp));
690 return ret ? -EFAULT : 0;
698 pointer to chaninfo structure
701 chaninfo structure at arg
704 arrays at elements of chaninfo structure
707 static int do_chaninfo_ioctl(struct comedi_device *dev,
708 struct comedi_chaninfo __user *arg)
710 struct comedi_subdevice *s;
711 struct comedi_chaninfo it;
713 if (copy_from_user(&it, arg, sizeof(it)))
716 if (it.subdev >= dev->n_subdevices)
718 s = &dev->subdevices[it.subdev];
720 if (it.maxdata_list) {
721 if (s->maxdata || !s->maxdata_list)
723 if (copy_to_user(it.maxdata_list, s->maxdata_list,
724 s->n_chan * sizeof(unsigned int)))
731 if (copy_to_user(it.flaglist, s->flaglist,
732 s->n_chan * sizeof(unsigned int)))
739 if (!s->range_table_list)
741 for (i = 0; i < s->n_chan; i++) {
744 x = (dev->minor << 28) | (it.subdev << 24) | (i << 16) |
745 (s->range_table_list[i]->length);
746 if (put_user(x, it.rangelist + i))
750 if (copy_to_user(it.rangelist, s->range_type_list,
751 s->n_chan * sizeof(unsigned int)))
761 buffer information ioctl
764 pointer to bufinfo structure
770 modified bufinfo at arg
773 static int do_bufinfo_ioctl(struct comedi_device *dev,
774 struct comedi_bufinfo __user *arg, void *file)
776 struct comedi_bufinfo bi;
777 struct comedi_subdevice *s;
778 struct comedi_async *async;
780 if (copy_from_user(&bi, arg, sizeof(bi)))
783 if (bi.subdevice >= dev->n_subdevices || bi.subdevice < 0)
786 s = &dev->subdevices[bi.subdevice];
788 if (s->lock && s->lock != file)
794 DPRINTK("subdevice does not have async capability\n");
795 bi.buf_write_ptr = 0;
797 bi.buf_write_count = 0;
798 bi.buf_read_count = 0;
800 bi.bytes_written = 0;
805 bi.bytes_written = 0;
806 goto copyback_position;
811 if (bi.bytes_read && (s->subdev_flags & SDF_CMD_READ)) {
812 bi.bytes_read = comedi_buf_read_alloc(async, bi.bytes_read);
813 comedi_buf_read_free(async, bi.bytes_read);
815 if (comedi_is_subdevice_idle(s) &&
816 async->buf_write_count == async->buf_read_count) {
817 do_become_nonbusy(dev, s);
821 if (bi.bytes_written && (s->subdev_flags & SDF_CMD_WRITE)) {
823 comedi_buf_write_alloc(async, bi.bytes_written);
824 comedi_buf_write_free(async, bi.bytes_written);
828 bi.buf_write_count = async->buf_write_count;
829 bi.buf_write_ptr = async->buf_write_ptr;
830 bi.buf_read_count = async->buf_read_count;
831 bi.buf_read_ptr = async->buf_read_ptr;
834 if (copy_to_user(arg, &bi, sizeof(bi)))
840 static int check_insn_config_length(struct comedi_insn *insn,
847 case INSN_CONFIG_DIO_OUTPUT:
848 case INSN_CONFIG_DIO_INPUT:
849 case INSN_CONFIG_DISARM:
850 case INSN_CONFIG_RESET:
854 case INSN_CONFIG_ARM:
855 case INSN_CONFIG_DIO_QUERY:
856 case INSN_CONFIG_BLOCK_SIZE:
857 case INSN_CONFIG_FILTER:
858 case INSN_CONFIG_SERIAL_CLOCK:
859 case INSN_CONFIG_BIDIRECTIONAL_DATA:
860 case INSN_CONFIG_ALT_SOURCE:
861 case INSN_CONFIG_SET_COUNTER_MODE:
862 case INSN_CONFIG_8254_READ_STATUS:
863 case INSN_CONFIG_SET_ROUTING:
864 case INSN_CONFIG_GET_ROUTING:
865 case INSN_CONFIG_GET_PWM_STATUS:
866 case INSN_CONFIG_PWM_SET_PERIOD:
867 case INSN_CONFIG_PWM_GET_PERIOD:
871 case INSN_CONFIG_SET_GATE_SRC:
872 case INSN_CONFIG_GET_GATE_SRC:
873 case INSN_CONFIG_SET_CLOCK_SRC:
874 case INSN_CONFIG_GET_CLOCK_SRC:
875 case INSN_CONFIG_SET_OTHER_SRC:
876 case INSN_CONFIG_GET_COUNTER_STATUS:
877 case INSN_CONFIG_PWM_SET_H_BRIDGE:
878 case INSN_CONFIG_PWM_GET_H_BRIDGE:
879 case INSN_CONFIG_GET_HARDWARE_BUFFER_SIZE:
883 case INSN_CONFIG_PWM_OUTPUT:
884 case INSN_CONFIG_ANALOG_TRIG:
888 case INSN_CONFIG_DIGITAL_TRIG:
892 /* by default we allow the insn since we don't have checks for
893 * all possible cases yet */
895 pr_warn("comedi: No check for data length of config insn id %i is implemented.\n",
897 pr_warn("comedi: Add a check to %s in %s.\n",
899 pr_warn("comedi: Assuming n=%i is correct.\n", insn->n);
905 static int parse_insn(struct comedi_device *dev, struct comedi_insn *insn,
906 unsigned int *data, void *file)
908 struct comedi_subdevice *s;
912 if (insn->insn & INSN_MASK_SPECIAL) {
913 /* a non-subdevice instruction */
915 switch (insn->insn) {
925 do_gettimeofday(&tv);
927 data[1] = tv.tv_usec;
933 if (insn->n != 1 || data[0] >= 100000) {
937 udelay(data[0] / 1000);
945 if (insn->subdev >= dev->n_subdevices) {
946 DPRINTK("%d not usable subdevice\n",
951 s = &dev->subdevices[insn->subdev];
953 DPRINTK("no async\n");
957 if (!s->async->inttrig) {
958 DPRINTK("no inttrig\n");
962 ret = s->async->inttrig(dev, s, data[0]);
967 DPRINTK("invalid insn\n");
972 /* a subdevice instruction */
973 unsigned int maxdata;
975 if (insn->subdev >= dev->n_subdevices) {
976 DPRINTK("subdevice %d out of range\n", insn->subdev);
980 s = &dev->subdevices[insn->subdev];
982 if (s->type == COMEDI_SUBD_UNUSED) {
983 DPRINTK("%d not usable subdevice\n", insn->subdev);
988 /* are we locked? (ioctl lock) */
989 if (s->lock && s->lock != file) {
990 DPRINTK("device locked\n");
995 ret = comedi_check_chanlist(s, 1, &insn->chanspec);
998 DPRINTK("bad chanspec\n");
1006 /* This looks arbitrary. It is. */
1007 s->busy = &parse_insn;
1008 switch (insn->insn) {
1010 ret = s->insn_read(dev, s, insn, data);
1013 maxdata = s->maxdata_list
1014 ? s->maxdata_list[CR_CHAN(insn->chanspec)]
1016 for (i = 0; i < insn->n; ++i) {
1017 if (data[i] > maxdata) {
1019 DPRINTK("bad data value(s)\n");
1024 ret = s->insn_write(dev, s, insn, data);
1030 /* Most drivers ignore the base channel in
1031 * insn->chanspec. Fix this here if
1032 * the subdevice has <= 32 channels. */
1034 unsigned int orig_mask;
1036 orig_mask = data[0];
1037 if (s->n_chan <= 32) {
1038 shift = CR_CHAN(insn->chanspec);
1046 ret = s->insn_bits(dev, s, insn, data);
1047 data[0] = orig_mask;
1053 ret = check_insn_config_length(insn, data);
1056 ret = s->insn_config(dev, s, insn, data);
1072 * synchronous instructions
1075 * pointer to sync cmd structure
1078 * sync cmd struct at arg
1085 /* arbitrary limits */
1086 #define MAX_SAMPLES 256
1087 static int do_insnlist_ioctl(struct comedi_device *dev,
1088 struct comedi_insnlist __user *arg, void *file)
1090 struct comedi_insnlist insnlist;
1091 struct comedi_insn *insns = NULL;
1092 unsigned int *data = NULL;
1096 if (copy_from_user(&insnlist, arg, sizeof(insnlist)))
1099 data = kmalloc(sizeof(unsigned int) * MAX_SAMPLES, GFP_KERNEL);
1101 DPRINTK("kmalloc failed\n");
1106 insns = kcalloc(insnlist.n_insns, sizeof(*insns), GFP_KERNEL);
1108 DPRINTK("kmalloc failed\n");
1113 if (copy_from_user(insns, insnlist.insns,
1114 sizeof(*insns) * insnlist.n_insns)) {
1115 DPRINTK("copy_from_user failed\n");
1120 for (i = 0; i < insnlist.n_insns; i++) {
1121 if (insns[i].n > MAX_SAMPLES) {
1122 DPRINTK("number of samples too large\n");
1126 if (insns[i].insn & INSN_MASK_WRITE) {
1127 if (copy_from_user(data, insns[i].data,
1128 insns[i].n * sizeof(unsigned int))) {
1129 DPRINTK("copy_from_user failed\n");
1134 ret = parse_insn(dev, insns + i, data, file);
1137 if (insns[i].insn & INSN_MASK_READ) {
1138 if (copy_to_user(insns[i].data, data,
1139 insns[i].n * sizeof(unsigned int))) {
1140 DPRINTK("copy_to_user failed\n");
1160 * synchronous instructions
1166 * struct comedi_insn struct at arg
1172 static int do_insn_ioctl(struct comedi_device *dev,
1173 struct comedi_insn __user *arg, void *file)
1175 struct comedi_insn insn;
1176 unsigned int *data = NULL;
1179 data = kmalloc(sizeof(unsigned int) * MAX_SAMPLES, GFP_KERNEL);
1185 if (copy_from_user(&insn, arg, sizeof(insn))) {
1190 /* This is where the behavior of insn and insnlist deviate. */
1191 if (insn.n > MAX_SAMPLES)
1192 insn.n = MAX_SAMPLES;
1193 if (insn.insn & INSN_MASK_WRITE) {
1194 if (copy_from_user(data,
1196 insn.n * sizeof(unsigned int))) {
1201 ret = parse_insn(dev, &insn, data, file);
1204 if (insn.insn & INSN_MASK_READ) {
1205 if (copy_to_user(insn.data,
1207 insn.n * sizeof(unsigned int))) {
1220 static int do_cmd_ioctl(struct comedi_device *dev,
1221 struct comedi_cmd __user *arg, void *file)
1223 struct comedi_cmd cmd;
1224 struct comedi_subdevice *s;
1225 struct comedi_async *async;
1227 unsigned int __user *user_chanlist;
1229 if (copy_from_user(&cmd, arg, sizeof(cmd))) {
1230 DPRINTK("bad cmd address\n");
1233 /* save user's chanlist pointer so it can be restored later */
1234 user_chanlist = (unsigned int __user *)cmd.chanlist;
1236 if (cmd.subdev >= dev->n_subdevices) {
1237 DPRINTK("%d no such subdevice\n", cmd.subdev);
1241 s = &dev->subdevices[cmd.subdev];
1244 if (s->type == COMEDI_SUBD_UNUSED) {
1245 DPRINTK("%d not valid subdevice\n", cmd.subdev);
1249 if (!s->do_cmd || !s->do_cmdtest || !s->async) {
1250 DPRINTK("subdevice %i does not support commands\n",
1255 /* are we locked? (ioctl lock) */
1256 if (s->lock && s->lock != file) {
1257 DPRINTK("subdevice locked\n");
1263 DPRINTK("subdevice busy\n");
1268 /* make sure channel/gain list isn't too long */
1269 if (cmd.chanlist_len > s->len_chanlist) {
1270 DPRINTK("channel/gain list too long %u > %d\n",
1271 cmd.chanlist_len, s->len_chanlist);
1276 /* make sure channel/gain list isn't too short */
1277 if (cmd.chanlist_len < 1) {
1278 DPRINTK("channel/gain list too short %u < 1\n",
1285 async->cmd.data = NULL;
1286 /* load channel/gain list */
1287 async->cmd.chanlist =
1288 kmalloc(async->cmd.chanlist_len * sizeof(int), GFP_KERNEL);
1289 if (!async->cmd.chanlist) {
1290 DPRINTK("allocation failed\n");
1295 if (copy_from_user(async->cmd.chanlist, user_chanlist,
1296 async->cmd.chanlist_len * sizeof(int))) {
1297 DPRINTK("fault reading chanlist\n");
1302 /* make sure each element in channel/gain list is valid */
1303 ret = comedi_check_chanlist(s,
1304 async->cmd.chanlist_len,
1305 async->cmd.chanlist);
1307 DPRINTK("bad chanlist\n");
1311 ret = s->do_cmdtest(dev, s, &async->cmd);
1313 if (async->cmd.flags & TRIG_BOGUS || ret) {
1314 DPRINTK("test returned %d\n", ret);
1316 /* restore chanlist pointer before copying back */
1317 cmd.chanlist = (unsigned int __force *)user_chanlist;
1319 if (copy_to_user(arg, &cmd, sizeof(cmd))) {
1320 DPRINTK("fault writing cmd\n");
1328 if (!async->prealloc_bufsz) {
1330 DPRINTK("no buffer (?)\n");
1334 comedi_buf_reset(async);
1337 COMEDI_CB_EOA | COMEDI_CB_BLOCK | COMEDI_CB_ERROR |
1339 if (async->cmd.flags & TRIG_WAKE_EOS)
1340 async->cb_mask |= COMEDI_CB_EOS;
1342 comedi_set_subdevice_runflags(s, ~0, SRF_USER | SRF_RUNNING);
1344 ret = s->do_cmd(dev, s);
1349 do_become_nonbusy(dev, s);
1356 command testing ioctl
1359 pointer to cmd structure
1362 cmd structure at arg
1366 modified cmd structure at arg
1369 static int do_cmdtest_ioctl(struct comedi_device *dev,
1370 struct comedi_cmd __user *arg, void *file)
1372 struct comedi_cmd cmd;
1373 struct comedi_subdevice *s;
1375 unsigned int *chanlist = NULL;
1376 unsigned int __user *user_chanlist;
1378 if (copy_from_user(&cmd, arg, sizeof(cmd))) {
1379 DPRINTK("bad cmd address\n");
1382 /* save user's chanlist pointer so it can be restored later */
1383 user_chanlist = (unsigned int __user *)cmd.chanlist;
1385 if (cmd.subdev >= dev->n_subdevices) {
1386 DPRINTK("%d no such subdevice\n", cmd.subdev);
1390 s = &dev->subdevices[cmd.subdev];
1391 if (s->type == COMEDI_SUBD_UNUSED) {
1392 DPRINTK("%d not valid subdevice\n", cmd.subdev);
1396 if (!s->do_cmd || !s->do_cmdtest) {
1397 DPRINTK("subdevice %i does not support commands\n",
1402 /* make sure channel/gain list isn't too long */
1403 if (cmd.chanlist_len > s->len_chanlist) {
1404 DPRINTK("channel/gain list too long %d > %d\n",
1405 cmd.chanlist_len, s->len_chanlist);
1410 /* load channel/gain list */
1413 kmalloc(cmd.chanlist_len * sizeof(int), GFP_KERNEL);
1415 DPRINTK("allocation failed\n");
1420 if (copy_from_user(chanlist, user_chanlist,
1421 cmd.chanlist_len * sizeof(int))) {
1422 DPRINTK("fault reading chanlist\n");
1427 /* make sure each element in channel/gain list is valid */
1428 ret = comedi_check_chanlist(s, cmd.chanlist_len, chanlist);
1430 DPRINTK("bad chanlist\n");
1434 cmd.chanlist = chanlist;
1437 ret = s->do_cmdtest(dev, s, &cmd);
1439 /* restore chanlist pointer before copying back */
1440 cmd.chanlist = (unsigned int __force *)user_chanlist;
1442 if (copy_to_user(arg, &cmd, sizeof(cmd))) {
1443 DPRINTK("bad cmd address\n");
1468 static int do_lock_ioctl(struct comedi_device *dev, unsigned int arg,
1472 unsigned long flags;
1473 struct comedi_subdevice *s;
1475 if (arg >= dev->n_subdevices)
1477 s = &dev->subdevices[arg];
1479 spin_lock_irqsave(&s->spin_lock, flags);
1480 if (s->busy || s->lock)
1484 spin_unlock_irqrestore(&s->spin_lock, flags);
1491 ret = s->lock_f(dev, s);
1510 This function isn't protected by the semaphore, since
1511 we already own the lock.
1513 static int do_unlock_ioctl(struct comedi_device *dev, unsigned int arg,
1516 struct comedi_subdevice *s;
1518 if (arg >= dev->n_subdevices)
1520 s = &dev->subdevices[arg];
1525 if (s->lock && s->lock != file)
1528 if (s->lock == file) {
1542 cancel acquisition ioctl
1554 static int do_cancel_ioctl(struct comedi_device *dev, unsigned int arg,
1557 struct comedi_subdevice *s;
1559 if (arg >= dev->n_subdevices)
1561 s = &dev->subdevices[arg];
1562 if (s->async == NULL)
1565 if (s->lock && s->lock != file)
1571 if (s->busy != file)
1574 return do_cancel(dev, s);
1579 instructs driver to synchronize buffers
1591 static int do_poll_ioctl(struct comedi_device *dev, unsigned int arg,
1594 struct comedi_subdevice *s;
1596 if (arg >= dev->n_subdevices)
1598 s = &dev->subdevices[arg];
1600 if (s->lock && s->lock != file)
1606 if (s->busy != file)
1610 return s->poll(dev, s);
1615 static long comedi_unlocked_ioctl(struct file *file, unsigned int cmd,
1618 const unsigned minor = iminor(file_inode(file));
1619 struct comedi_file_info *info = comedi_file_info_from_minor(minor);
1620 struct comedi_device *dev = comedi_dev_from_file_info(info);
1626 mutex_lock(&dev->mutex);
1628 /* Device config is special, because it must work on
1629 * an unconfigured device. */
1630 if (cmd == COMEDI_DEVCONFIG) {
1631 if (minor >= COMEDI_NUM_BOARD_MINORS) {
1632 /* Device config not appropriate on non-board minors. */
1636 rc = do_devconfig_ioctl(dev,
1637 (struct comedi_devconfig __user *)arg);
1639 /* Evade comedi_auto_unconfig(). */
1640 info->hardware_device = NULL;
1644 if (!dev->attached) {
1645 DPRINTK("no driver configured on /dev/comedi%i\n", dev->minor);
1651 case COMEDI_BUFCONFIG:
1652 rc = do_bufconfig_ioctl(dev,
1653 (struct comedi_bufconfig __user *)arg);
1655 case COMEDI_DEVINFO:
1656 rc = do_devinfo_ioctl(dev, (struct comedi_devinfo __user *)arg,
1659 case COMEDI_SUBDINFO:
1660 rc = do_subdinfo_ioctl(dev,
1661 (struct comedi_subdinfo __user *)arg,
1664 case COMEDI_CHANINFO:
1665 rc = do_chaninfo_ioctl(dev, (void __user *)arg);
1667 case COMEDI_RANGEINFO:
1668 rc = do_rangeinfo_ioctl(dev, (void __user *)arg);
1670 case COMEDI_BUFINFO:
1671 rc = do_bufinfo_ioctl(dev,
1672 (struct comedi_bufinfo __user *)arg,
1676 rc = do_lock_ioctl(dev, arg, file);
1679 rc = do_unlock_ioctl(dev, arg, file);
1682 rc = do_cancel_ioctl(dev, arg, file);
1685 rc = do_cmd_ioctl(dev, (struct comedi_cmd __user *)arg, file);
1687 case COMEDI_CMDTEST:
1688 rc = do_cmdtest_ioctl(dev, (struct comedi_cmd __user *)arg,
1691 case COMEDI_INSNLIST:
1692 rc = do_insnlist_ioctl(dev,
1693 (struct comedi_insnlist __user *)arg,
1697 rc = do_insn_ioctl(dev, (struct comedi_insn __user *)arg,
1701 rc = do_poll_ioctl(dev, arg, file);
1709 mutex_unlock(&dev->mutex);
1713 static void comedi_vm_open(struct vm_area_struct *area)
1715 struct comedi_async *async;
1716 struct comedi_device *dev;
1718 async = area->vm_private_data;
1719 dev = async->subdevice->device;
1721 mutex_lock(&dev->mutex);
1722 async->mmap_count++;
1723 mutex_unlock(&dev->mutex);
1726 static void comedi_vm_close(struct vm_area_struct *area)
1728 struct comedi_async *async;
1729 struct comedi_device *dev;
1731 async = area->vm_private_data;
1732 dev = async->subdevice->device;
1734 mutex_lock(&dev->mutex);
1735 async->mmap_count--;
1736 mutex_unlock(&dev->mutex);
1739 static struct vm_operations_struct comedi_vm_ops = {
1740 .open = comedi_vm_open,
1741 .close = comedi_vm_close,
1744 static int comedi_mmap(struct file *file, struct vm_area_struct *vma)
1746 const unsigned minor = iminor(file_inode(file));
1747 struct comedi_file_info *info = comedi_file_info_from_minor(minor);
1748 struct comedi_device *dev = comedi_dev_from_file_info(info);
1749 struct comedi_subdevice *s;
1750 struct comedi_async *async;
1751 unsigned long start = vma->vm_start;
1760 mutex_lock(&dev->mutex);
1762 if (!dev->attached) {
1763 DPRINTK("no driver configured on comedi%i\n", dev->minor);
1768 if (vma->vm_flags & VM_WRITE)
1769 s = comedi_write_subdevice(info);
1771 s = comedi_read_subdevice(info);
1783 if (vma->vm_pgoff != 0) {
1784 DPRINTK("comedi: mmap() offset must be 0.\n");
1789 size = vma->vm_end - vma->vm_start;
1790 if (size > async->prealloc_bufsz) {
1794 if (size & (~PAGE_MASK)) {
1799 n_pages = size >> PAGE_SHIFT;
1800 for (i = 0; i < n_pages; ++i) {
1801 struct comedi_buf_page *buf = &async->buf_page_list[i];
1803 if (remap_pfn_range(vma, start,
1804 page_to_pfn(virt_to_page(buf->virt_addr)),
1805 PAGE_SIZE, PAGE_SHARED)) {
1812 vma->vm_ops = &comedi_vm_ops;
1813 vma->vm_private_data = async;
1815 async->mmap_count++;
1819 mutex_unlock(&dev->mutex);
1823 static unsigned int comedi_poll(struct file *file, poll_table *wait)
1825 unsigned int mask = 0;
1826 const unsigned minor = iminor(file_inode(file));
1827 struct comedi_file_info *info = comedi_file_info_from_minor(minor);
1828 struct comedi_device *dev = comedi_dev_from_file_info(info);
1829 struct comedi_subdevice *s;
1834 mutex_lock(&dev->mutex);
1836 if (!dev->attached) {
1837 DPRINTK("no driver configured on comedi%i\n", dev->minor);
1841 s = comedi_read_subdevice(info);
1842 if (s && s->async) {
1843 poll_wait(file, &s->async->wait_head, wait);
1844 if (!s->busy || !comedi_is_subdevice_running(s) ||
1845 comedi_buf_read_n_available(s->async) > 0)
1846 mask |= POLLIN | POLLRDNORM;
1849 s = comedi_write_subdevice(info);
1850 if (s && s->async) {
1851 unsigned int bps = bytes_per_sample(s->async->subdevice);
1853 poll_wait(file, &s->async->wait_head, wait);
1854 comedi_buf_write_alloc(s->async, s->async->prealloc_bufsz);
1855 if (!s->busy || !comedi_is_subdevice_running(s) ||
1856 comedi_buf_write_n_allocated(s->async) >= bps)
1857 mask |= POLLOUT | POLLWRNORM;
1861 mutex_unlock(&dev->mutex);
1865 static ssize_t comedi_write(struct file *file, const char __user *buf,
1866 size_t nbytes, loff_t *offset)
1868 struct comedi_subdevice *s;
1869 struct comedi_async *async;
1870 int n, m, count = 0, retval = 0;
1871 DECLARE_WAITQUEUE(wait, current);
1872 const unsigned minor = iminor(file_inode(file));
1873 struct comedi_file_info *info = comedi_file_info_from_minor(minor);
1874 struct comedi_device *dev = comedi_dev_from_file_info(info);
1879 if (!dev->attached) {
1880 DPRINTK("no driver configured on comedi%i\n", dev->minor);
1884 s = comedi_write_subdevice(info);
1885 if (!s || !s->async)
1890 if (!s->busy || !nbytes)
1892 if (s->busy != file)
1895 add_wait_queue(&async->wait_head, &wait);
1896 while (nbytes > 0 && !retval) {
1897 set_current_state(TASK_INTERRUPTIBLE);
1899 if (!comedi_is_subdevice_running(s)) {
1901 if (comedi_is_subdevice_in_error(s))
1905 do_become_nonbusy(dev, s);
1913 if (async->buf_write_ptr + m > async->prealloc_bufsz)
1914 m = async->prealloc_bufsz - async->buf_write_ptr;
1915 comedi_buf_write_alloc(async, async->prealloc_bufsz);
1916 if (m > comedi_buf_write_n_allocated(async))
1917 m = comedi_buf_write_n_allocated(async);
1922 if (file->f_flags & O_NONBLOCK) {
1927 if (signal_pending(current)) {
1928 retval = -ERESTARTSYS;
1933 if (s->busy != file) {
1940 m = copy_from_user(async->prealloc_buf + async->buf_write_ptr,
1946 comedi_buf_write_free(async, n);
1952 break; /* makes device work like a pipe */
1954 set_current_state(TASK_RUNNING);
1955 remove_wait_queue(&async->wait_head, &wait);
1957 return count ? count : retval;
1960 static ssize_t comedi_read(struct file *file, char __user *buf, size_t nbytes,
1963 struct comedi_subdevice *s;
1964 struct comedi_async *async;
1965 int n, m, count = 0, retval = 0;
1966 DECLARE_WAITQUEUE(wait, current);
1967 const unsigned minor = iminor(file_inode(file));
1968 struct comedi_file_info *info = comedi_file_info_from_minor(minor);
1969 struct comedi_device *dev = comedi_dev_from_file_info(info);
1974 if (!dev->attached) {
1975 DPRINTK("no driver configured on comedi%i\n", dev->minor);
1979 s = comedi_read_subdevice(info);
1980 if (!s || !s->async)
1984 if (!s->busy || !nbytes)
1986 if (s->busy != file)
1989 add_wait_queue(&async->wait_head, &wait);
1990 while (nbytes > 0 && !retval) {
1991 set_current_state(TASK_INTERRUPTIBLE);
1995 m = comedi_buf_read_n_available(async);
1996 /* printk("%d available\n",m); */
1997 if (async->buf_read_ptr + m > async->prealloc_bufsz)
1998 m = async->prealloc_bufsz - async->buf_read_ptr;
1999 /* printk("%d contiguous\n",m); */
2004 if (!comedi_is_subdevice_running(s)) {
2005 do_become_nonbusy(dev, s);
2006 if (comedi_is_subdevice_in_error(s))
2012 if (file->f_flags & O_NONBLOCK) {
2017 if (signal_pending(current)) {
2018 retval = -ERESTARTSYS;
2025 if (s->busy != file) {
2031 m = copy_to_user(buf, async->prealloc_buf +
2032 async->buf_read_ptr, n);
2038 comedi_buf_read_alloc(async, n);
2039 comedi_buf_read_free(async, n);
2045 break; /* makes device work like a pipe */
2047 if (comedi_is_subdevice_idle(s) &&
2048 async->buf_read_count - async->buf_write_count == 0) {
2049 do_become_nonbusy(dev, s);
2051 set_current_state(TASK_RUNNING);
2052 remove_wait_queue(&async->wait_head, &wait);
2054 return count ? count : retval;
2057 static int comedi_open(struct inode *inode, struct file *file)
2059 const unsigned minor = iminor(inode);
2060 struct comedi_device *dev = comedi_dev_from_minor(minor);
2063 DPRINTK("invalid minor number\n");
2067 /* This is slightly hacky, but we want module autoloading
2069 * case: user opens device, attached -> ok
2070 * case: user opens device, unattached, !in_request_module -> autoload
2071 * case: user opens device, unattached, in_request_module -> fail
2072 * case: root opens device, attached -> ok
2073 * case: root opens device, unattached, in_request_module -> ok
2074 * (typically called from modprobe)
2075 * case: root opens device, unattached, !in_request_module -> autoload
2077 * The last could be changed to "-> ok", which would deny root
2080 mutex_lock(&dev->mutex);
2083 if (!capable(CAP_NET_ADMIN) && dev->in_request_module) {
2084 DPRINTK("in request module\n");
2085 mutex_unlock(&dev->mutex);
2088 if (capable(CAP_NET_ADMIN) && dev->in_request_module)
2091 dev->in_request_module = true;
2094 mutex_unlock(&dev->mutex);
2095 request_module("char-major-%i-%i", COMEDI_MAJOR, dev->minor);
2096 mutex_lock(&dev->mutex);
2099 dev->in_request_module = false;
2101 if (!dev->attached && !capable(CAP_NET_ADMIN)) {
2102 DPRINTK("not attached and not CAP_NET_ADMIN\n");
2103 mutex_unlock(&dev->mutex);
2107 __module_get(THIS_MODULE);
2109 if (dev->attached) {
2110 if (!try_module_get(dev->driver->module)) {
2111 module_put(THIS_MODULE);
2112 mutex_unlock(&dev->mutex);
2117 if (dev->attached && dev->use_count == 0 && dev->open) {
2118 int rc = dev->open(dev);
2120 module_put(dev->driver->module);
2121 module_put(THIS_MODULE);
2122 mutex_unlock(&dev->mutex);
2129 mutex_unlock(&dev->mutex);
2134 static int comedi_fasync(int fd, struct file *file, int on)
2136 const unsigned minor = iminor(file_inode(file));
2137 struct comedi_device *dev = comedi_dev_from_minor(minor);
2142 return fasync_helper(fd, file, on, &dev->async_queue);
2145 static int comedi_close(struct inode *inode, struct file *file)
2147 const unsigned minor = iminor(inode);
2148 struct comedi_device *dev = comedi_dev_from_minor(minor);
2149 struct comedi_subdevice *s = NULL;
2155 mutex_lock(&dev->mutex);
2157 if (dev->subdevices) {
2158 for (i = 0; i < dev->n_subdevices; i++) {
2159 s = &dev->subdevices[i];
2161 if (s->busy == file)
2163 if (s->lock == file)
2167 if (dev->attached && dev->use_count == 1 && dev->close)
2170 module_put(THIS_MODULE);
2172 module_put(dev->driver->module);
2176 mutex_unlock(&dev->mutex);
2178 if (file->f_flags & FASYNC)
2179 comedi_fasync(-1, file, 0);
2184 static const struct file_operations comedi_fops = {
2185 .owner = THIS_MODULE,
2186 .unlocked_ioctl = comedi_unlocked_ioctl,
2187 .compat_ioctl = comedi_compat_ioctl,
2188 .open = comedi_open,
2189 .release = comedi_close,
2190 .read = comedi_read,
2191 .write = comedi_write,
2192 .mmap = comedi_mmap,
2193 .poll = comedi_poll,
2194 .fasync = comedi_fasync,
2195 .llseek = noop_llseek,
2198 static struct class *comedi_class;
2199 static struct cdev comedi_cdev;
2201 void comedi_error(const struct comedi_device *dev, const char *s)
2203 dev_err(dev->class_dev, "%s: %s\n", dev->driver->driver_name, s);
2205 EXPORT_SYMBOL(comedi_error);
2207 void comedi_event(struct comedi_device *dev, struct comedi_subdevice *s)
2209 struct comedi_async *async = s->async;
2210 unsigned runflags = 0;
2211 unsigned runflags_mask = 0;
2213 /* DPRINTK("comedi_event 0x%x\n",mask); */
2215 if (!comedi_is_subdevice_running(s))
2219 async->events & (COMEDI_CB_EOA | COMEDI_CB_ERROR |
2220 COMEDI_CB_OVERFLOW)) {
2221 runflags_mask |= SRF_RUNNING;
2223 /* remember if an error event has occurred, so an error
2224 * can be returned the next time the user does a read() */
2225 if (s->async->events & (COMEDI_CB_ERROR | COMEDI_CB_OVERFLOW)) {
2226 runflags_mask |= SRF_ERROR;
2227 runflags |= SRF_ERROR;
2229 if (runflags_mask) {
2230 /*sets SRF_ERROR and SRF_RUNNING together atomically */
2231 comedi_set_subdevice_runflags(s, runflags_mask, runflags);
2234 if (async->cb_mask & s->async->events) {
2235 if (comedi_get_subdevice_runflags(s) & SRF_USER) {
2236 wake_up_interruptible(&async->wait_head);
2237 if (s->subdev_flags & SDF_CMD_READ)
2238 kill_fasync(&dev->async_queue, SIGIO, POLL_IN);
2239 if (s->subdev_flags & SDF_CMD_WRITE)
2240 kill_fasync(&dev->async_queue, SIGIO, POLL_OUT);
2243 async->cb_func(s->async->events, async->cb_arg);
2246 s->async->events = 0;
2248 EXPORT_SYMBOL(comedi_event);
2250 static void comedi_device_init(struct comedi_device *dev)
2252 memset(dev, 0, sizeof(*dev));
2253 spin_lock_init(&dev->spinlock);
2254 mutex_init(&dev->mutex);
2258 static void comedi_device_cleanup(struct comedi_device *dev)
2262 mutex_lock(&dev->mutex);
2263 comedi_device_detach(dev);
2264 mutex_unlock(&dev->mutex);
2265 mutex_destroy(&dev->mutex);
2268 int comedi_alloc_board_minor(struct device *hardware_device)
2270 struct comedi_file_info *info;
2271 struct device *csdev;
2274 info = kzalloc(sizeof(*info), GFP_KERNEL);
2277 info->device = kzalloc(sizeof(struct comedi_device), GFP_KERNEL);
2278 if (info->device == NULL) {
2282 info->hardware_device = hardware_device;
2283 comedi_device_init(info->device);
2284 spin_lock(&comedi_file_info_table_lock);
2285 for (i = 0; i < COMEDI_NUM_BOARD_MINORS; ++i) {
2286 if (comedi_file_info_table[i] == NULL) {
2287 comedi_file_info_table[i] = info;
2291 spin_unlock(&comedi_file_info_table_lock);
2292 if (i == COMEDI_NUM_BOARD_MINORS) {
2293 comedi_device_cleanup(info->device);
2294 kfree(info->device);
2296 pr_err("comedi: error: ran out of minor numbers for board device files.\n");
2299 info->device->minor = i;
2300 csdev = device_create(comedi_class, hardware_device,
2301 MKDEV(COMEDI_MAJOR, i), NULL, "comedi%i", i);
2303 info->device->class_dev = csdev;
2304 dev_set_drvdata(csdev, info);
2309 void comedi_free_board_minor(unsigned minor)
2311 struct comedi_file_info *info;
2313 BUG_ON(minor >= COMEDI_NUM_BOARD_MINORS);
2314 spin_lock(&comedi_file_info_table_lock);
2315 info = comedi_file_info_table[minor];
2316 comedi_file_info_table[minor] = NULL;
2317 spin_unlock(&comedi_file_info_table_lock);
2320 struct comedi_device *dev = info->device;
2322 if (dev->class_dev) {
2323 device_destroy(comedi_class,
2324 MKDEV(COMEDI_MAJOR, dev->minor));
2326 comedi_device_cleanup(dev);
2333 int comedi_find_board_minor(struct device *hardware_device)
2336 struct comedi_file_info *info;
2338 for (minor = 0; minor < COMEDI_NUM_BOARD_MINORS; minor++) {
2339 spin_lock(&comedi_file_info_table_lock);
2340 info = comedi_file_info_table[minor];
2341 if (info && info->hardware_device == hardware_device) {
2342 spin_unlock(&comedi_file_info_table_lock);
2345 spin_unlock(&comedi_file_info_table_lock);
2350 int comedi_alloc_subdevice_minor(struct comedi_subdevice *s)
2352 struct comedi_device *dev = s->device;
2353 struct comedi_file_info *info;
2354 struct device *csdev;
2357 info = kzalloc(sizeof(*info), GFP_KERNEL);
2361 if (s->subdev_flags & SDF_CMD_READ)
2362 info->read_subdevice = s;
2363 if (s->subdev_flags & SDF_CMD_WRITE)
2364 info->write_subdevice = s;
2365 spin_lock(&comedi_file_info_table_lock);
2366 for (i = COMEDI_FIRST_SUBDEVICE_MINOR; i < COMEDI_NUM_MINORS; ++i) {
2367 if (comedi_file_info_table[i] == NULL) {
2368 comedi_file_info_table[i] = info;
2372 spin_unlock(&comedi_file_info_table_lock);
2373 if (i == COMEDI_NUM_MINORS) {
2375 pr_err("comedi: error: ran out of minor numbers for subdevice files.\n");
2379 csdev = device_create(comedi_class, dev->class_dev,
2380 MKDEV(COMEDI_MAJOR, i), NULL, "comedi%i_subd%i",
2381 dev->minor, s->index);
2383 s->class_dev = csdev;
2384 dev_set_drvdata(csdev, info);
2389 void comedi_free_subdevice_minor(struct comedi_subdevice *s)
2391 struct comedi_file_info *info;
2398 BUG_ON(s->minor >= COMEDI_NUM_MINORS);
2399 BUG_ON(s->minor < COMEDI_FIRST_SUBDEVICE_MINOR);
2401 spin_lock(&comedi_file_info_table_lock);
2402 info = comedi_file_info_table[s->minor];
2403 comedi_file_info_table[s->minor] = NULL;
2404 spin_unlock(&comedi_file_info_table_lock);
2407 device_destroy(comedi_class, MKDEV(COMEDI_MAJOR, s->minor));
2408 s->class_dev = NULL;
2413 static void comedi_cleanup_board_minors(void)
2417 for (i = 0; i < COMEDI_NUM_BOARD_MINORS; i++)
2418 comedi_free_board_minor(i);
2421 static int __init comedi_init(void)
2426 pr_info("comedi: version " COMEDI_RELEASE " - http://www.comedi.org\n");
2428 if (comedi_num_legacy_minors < 0 ||
2429 comedi_num_legacy_minors > COMEDI_NUM_BOARD_MINORS) {
2430 pr_err("comedi: error: invalid value for module parameter \"comedi_num_legacy_minors\". Valid values are 0 through %i.\n",
2431 COMEDI_NUM_BOARD_MINORS);
2435 retval = register_chrdev_region(MKDEV(COMEDI_MAJOR, 0),
2436 COMEDI_NUM_MINORS, "comedi");
2439 cdev_init(&comedi_cdev, &comedi_fops);
2440 comedi_cdev.owner = THIS_MODULE;
2441 kobject_set_name(&comedi_cdev.kobj, "comedi");
2442 if (cdev_add(&comedi_cdev, MKDEV(COMEDI_MAJOR, 0), COMEDI_NUM_MINORS)) {
2443 unregister_chrdev_region(MKDEV(COMEDI_MAJOR, 0),
2447 comedi_class = class_create(THIS_MODULE, "comedi");
2448 if (IS_ERR(comedi_class)) {
2449 pr_err("comedi: failed to create class\n");
2450 cdev_del(&comedi_cdev);
2451 unregister_chrdev_region(MKDEV(COMEDI_MAJOR, 0),
2453 return PTR_ERR(comedi_class);
2456 comedi_class->dev_attrs = comedi_dev_attrs;
2458 /* XXX requires /proc interface */
2461 /* create devices files for legacy/manual use */
2462 for (i = 0; i < comedi_num_legacy_minors; i++) {
2464 minor = comedi_alloc_board_minor(NULL);
2466 comedi_cleanup_board_minors();
2467 cdev_del(&comedi_cdev);
2468 unregister_chrdev_region(MKDEV(COMEDI_MAJOR, 0),
2476 module_init(comedi_init);
2478 static void __exit comedi_cleanup(void)
2482 comedi_cleanup_board_minors();
2483 for (i = 0; i < COMEDI_NUM_MINORS; ++i)
2484 BUG_ON(comedi_file_info_table[i]);
2486 class_destroy(comedi_class);
2487 cdev_del(&comedi_cdev);
2488 unregister_chrdev_region(MKDEV(COMEDI_MAJOR, 0), COMEDI_NUM_MINORS);
2490 comedi_proc_cleanup();
2492 module_exit(comedi_cleanup);
2494 MODULE_AUTHOR("http://www.comedi.org");
2495 MODULE_DESCRIPTION("Comedi core module");
2496 MODULE_LICENSE("GPL");