2 kcomedilib/kcomedilib.c
3 a comedlib interface for kernel modules
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.
24 #define __NO_VERSION__
25 #include <linux/module.h>
27 #include <linux/errno.h>
28 #include <linux/kernel.h>
29 #include <linux/sched.h>
30 #include <linux/fcntl.h>
31 #include <linux/delay.h>
32 #include <linux/ioport.h>
36 #include "../comedi.h"
37 #include "../comedilib.h"
38 #include "../comedidev.h"
40 MODULE_AUTHOR("David Schleef <ds@schleef.org>");
41 MODULE_DESCRIPTION("Comedi kernel library");
42 MODULE_LICENSE("GPL");
44 void *comedi_open(const char *filename)
46 struct comedi_device_file_info *dev_file_info;
47 struct comedi_device *dev;
50 if (strncmp(filename, "/dev/comedi", 11) != 0)
53 minor = simple_strtoul(filename + 11, NULL, 0);
55 if (minor >= COMEDI_NUM_BOARD_MINORS)
58 dev_file_info = comedi_get_device_file_info(minor);
59 if (dev_file_info == NULL)
61 dev = dev_file_info->device;
63 if (dev == NULL || !dev->attached)
66 if (!try_module_get(dev->driver->module))
71 EXPORT_SYMBOL(comedi_open);
73 int comedi_close(void *d)
75 struct comedi_device *dev = (struct comedi_device *)d;
77 module_put(dev->driver->module);
81 EXPORT_SYMBOL(comedi_close);
85 * perform an instruction
87 static int comedi_do_insn(void *d, struct comedi_insn *insn)
89 struct comedi_device *dev = (struct comedi_device *)d;
90 struct comedi_subdevice *s;
93 if (insn->insn & INSN_MASK_SPECIAL) {
100 insn->data[0] = tv.tv_sec;
101 insn->data[1] = tv.tv_usec;
107 /* XXX isn't the value supposed to be nanosecs? */
108 if (insn->n != 1 || insn->data[0] >= 100) {
112 udelay(insn->data[0]);
120 if (insn->subdev >= dev->n_subdevices) {
121 printk("%d not usable subdevice\n",
126 s = dev->subdevices + insn->subdev;
128 printk("no async\n");
132 if (!s->async->inttrig) {
133 printk("no inttrig\n");
137 ret = s->async->inttrig(dev, s, insn->data[0]);
145 /* a subdevice instruction */
146 if (insn->subdev >= dev->n_subdevices) {
150 s = dev->subdevices + insn->subdev;
152 if (s->type == COMEDI_SUBD_UNUSED) {
153 printk("%d not useable subdevice\n", insn->subdev);
160 ret = comedi_check_chanlist(s, 1, &insn->chanspec);
162 printk("bad chanspec\n");
173 switch (insn->insn) {
175 ret = s->insn_read(dev, s, insn, insn->data);
178 ret = s->insn_write(dev, s, insn, insn->data);
181 ret = s->insn_bits(dev, s, insn, insn->data);
184 /* XXX should check instruction length */
185 ret = s->insn_config(dev, s, insn, insn->data);
197 /* XXX do we want this? -- abbotti #if'ed it out for now. */
198 if (ret != insn->n) {
199 printk("BUG: result of insn != insn.n\n");
209 int comedi_dio_config(void *dev, unsigned int subdev, unsigned int chan,
212 struct comedi_insn insn;
214 memset(&insn, 0, sizeof(insn));
215 insn.insn = INSN_CONFIG;
218 insn.subdev = subdev;
219 insn.chanspec = CR_PACK(chan, 0, 0);
221 return comedi_do_insn(dev, &insn);
223 EXPORT_SYMBOL(comedi_dio_config);
225 int comedi_dio_bitfield(void *dev, unsigned int subdev, unsigned int mask,
228 struct comedi_insn insn;
229 unsigned int data[2];
232 memset(&insn, 0, sizeof(insn));
233 insn.insn = INSN_BITS;
236 insn.subdev = subdev;
241 ret = comedi_do_insn(dev, &insn);
247 EXPORT_SYMBOL(comedi_dio_bitfield);
249 int comedi_find_subdevice_by_type(void *d, int type, unsigned int subd)
251 struct comedi_device *dev = (struct comedi_device *)d;
253 if (subd > dev->n_subdevices)
256 for (; subd < dev->n_subdevices; subd++) {
257 if (dev->subdevices[subd].type == type)
262 EXPORT_SYMBOL(comedi_find_subdevice_by_type);
264 int comedi_get_n_channels(void *d, unsigned int subdevice)
266 struct comedi_device *dev = (struct comedi_device *)d;
267 struct comedi_subdevice *s = dev->subdevices + subdevice;
271 EXPORT_SYMBOL(comedi_get_n_channels);