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/*
kcomedilib/data.c
implements comedi_data_*() functions
COMEDI - Linux Control and Measurement Device Interface
Copyright (C) 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 "../comedi.h"
#include "../comedilib.h"
#include "../comedidev.h" /* for comedi_udelay() */
#include <linux/string.h>
int comedi_data_write(void *dev, unsigned int subdev, unsigned int chan,
unsigned int range, unsigned int aref, unsigned int data)
{
struct comedi_insn insn;
memset(&insn, 0, sizeof(insn));
insn.insn = INSN_WRITE;
insn.n = 1;
insn.data = &data;
insn.subdev = subdev;
insn.chanspec = CR_PACK(chan, range, aref);
return comedi_do_insn(dev, &insn);
}
int comedi_data_read(void *dev, unsigned int subdev, unsigned int chan,
unsigned int range, unsigned int aref, unsigned int *data)
{
struct comedi_insn insn;
memset(&insn, 0, sizeof(insn));
insn.insn = INSN_READ;
insn.n = 1;
insn.data = data;
insn.subdev = subdev;
insn.chanspec = CR_PACK(chan, range, aref);
return comedi_do_insn(dev, &insn);
}
int comedi_data_read_hint(void *dev, unsigned int subdev,
unsigned int chan, unsigned int range, unsigned int aref)
{
struct comedi_insn insn;
unsigned int dummy_data;
memset(&insn, 0, sizeof(insn));
insn.insn = INSN_READ;
insn.n = 0;
insn.data = &dummy_data;
insn.subdev = subdev;
insn.chanspec = CR_PACK(chan, range, aref);
return comedi_do_insn(dev, &insn);
}
int comedi_data_read_delayed(void *dev, unsigned int subdev,
unsigned int chan, unsigned int range, unsigned int aref,
unsigned int *data, unsigned int nano_sec)
{
int retval;
retval = comedi_data_read_hint(dev, subdev, chan, range, aref);
if (retval < 0)
return retval;
comedi_udelay((nano_sec + 999) / 1000);
return comedi_data_read(dev, subdev, chan, range, aref, data);
}
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