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/*
kcomedilib/kcomedilib.c
a comedlib interface for kernel modules
COMEDI - Linux Control and Measurement Device Interface
Copyright (C) 1997-2000 David A. Schleef <ds@schleef.org>
This program is free software; you can redistribute it and/or modify
it under the terms of the GNU General Public License as published by
the Free Software Foundation; either version 2 of the License, or
(at your option) any later version.
This program is distributed in the hope that it will be useful,
but WITHOUT ANY WARRANTY; without even the implied warranty of
MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
GNU General Public License for more details.
You should have received a copy of the GNU General Public License
along with this program; if not, write to the Free Software
Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
*/
#include <linux/module.h>
#include <linux/errno.h>
#include <linux/kernel.h>
#include <linux/sched.h>
#include <linux/fcntl.h>
#include <linux/delay.h>
#include <linux/ioport.h>
#include <linux/mm.h>
#include <linux/io.h>
#include "../comedi.h"
#include "../comedilib.h"
#include "../comedidev.h"
MODULE_AUTHOR("David Schleef <ds@schleef.org>");
MODULE_DESCRIPTION("Comedi kernel library");
MODULE_LICENSE("GPL");
struct comedi_device *comedi_open(const char *filename)
{
struct comedi_device *dev;
unsigned int minor;
if (strncmp(filename, "/dev/comedi", 11) != 0)
return NULL;
minor = simple_strtoul(filename + 11, NULL, 0);
if (minor >= COMEDI_NUM_BOARD_MINORS)
return NULL;
dev = comedi_dev_from_minor(minor);
if (!dev || !dev->attached)
return NULL;
if (!try_module_get(dev->driver->module))
return NULL;
return dev;
}
EXPORT_SYMBOL(comedi_open);
int comedi_close(struct comedi_device *d)
{
struct comedi_device *dev = (struct comedi_device *)d;
module_put(dev->driver->module);
return 0;
}
EXPORT_SYMBOL(comedi_close);
static int comedi_do_insn(struct comedi_device *dev,
struct comedi_insn *insn,
unsigned int *data)
{
struct comedi_subdevice *s;
int ret = 0;
/* a subdevice instruction */
if (insn->subdev >= dev->n_subdevices) {
ret = -EINVAL;
goto error;
}
s = &dev->subdevices[insn->subdev];
if (s->type == COMEDI_SUBD_UNUSED) {
dev_err(dev->class_dev,
"%d not useable subdevice\n", insn->subdev);
ret = -EIO;
goto error;
}
/* XXX check lock */
ret = comedi_check_chanlist(s, 1, &insn->chanspec);
if (ret < 0) {
dev_err(dev->class_dev, "bad chanspec\n");
ret = -EINVAL;
goto error;
}
if (s->busy) {
ret = -EBUSY;
goto error;
}
s->busy = dev;
switch (insn->insn) {
case INSN_BITS:
ret = s->insn_bits(dev, s, insn, data);
break;
case INSN_CONFIG:
/* XXX should check instruction length */
ret = s->insn_config(dev, s, insn, data);
break;
default:
ret = -EINVAL;
break;
}
s->busy = NULL;
error:
return ret;
}
int comedi_dio_config(struct comedi_device *dev, unsigned int subdev,
unsigned int chan, unsigned int io)
{
struct comedi_insn insn;
memset(&insn, 0, sizeof(insn));
insn.insn = INSN_CONFIG;
insn.n = 1;
insn.subdev = subdev;
insn.chanspec = CR_PACK(chan, 0, 0);
return comedi_do_insn(dev, &insn, &io);
}
EXPORT_SYMBOL(comedi_dio_config);
int comedi_dio_bitfield(struct comedi_device *dev, unsigned int subdev,
unsigned int mask, unsigned int *bits)
{
struct comedi_insn insn;
unsigned int data[2];
int ret;
memset(&insn, 0, sizeof(insn));
insn.insn = INSN_BITS;
insn.n = 2;
insn.subdev = subdev;
data[0] = mask;
data[1] = *bits;
ret = comedi_do_insn(dev, &insn, data);
*bits = data[1];
return ret;
}
EXPORT_SYMBOL(comedi_dio_bitfield);
int comedi_find_subdevice_by_type(struct comedi_device *dev, int type,
unsigned int subd)
{
struct comedi_subdevice *s;
if (subd > dev->n_subdevices)
return -ENODEV;
for (; subd < dev->n_subdevices; subd++) {
s = &dev->subdevices[subd];
if (s->type == type)
return subd;
}
return -1;
}
EXPORT_SYMBOL(comedi_find_subdevice_by_type);
int comedi_get_n_channels(struct comedi_device *dev, unsigned int subdevice)
{
struct comedi_subdevice *s = &dev->subdevices[subdevice];
return s->n_chan;
}
EXPORT_SYMBOL(comedi_get_n_channels);
|
