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/*
comedi/drivers/dt2817.c
Hardware driver for Data Translation DT2817
COMEDI - Linux Control and Measurement Device Interface
Copyright (C) 1998 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.
*/
/*
Driver: dt2817
Description: Data Translation DT2817
Author: ds
Status: complete
Devices: [Data Translation] DT2817 (dt2817)
A very simple digital I/O card. Four banks of 8 lines, each bank
is configurable for input or output. One wonders why it takes a
50 page manual to describe this thing.
The driver (which, btw, is much less than 50 pages) has 1 subdevice
with 32 channels, configurable in groups of 8.
Configuration options:
[0] - I/O port base base address
*/
#include <linux/module.h>
#include "../comedidev.h"
#define DT2817_SIZE 5
#define DT2817_CR 0
#define DT2817_DATA 1
static int dt2817_dio_insn_config(struct comedi_device *dev,
struct comedi_subdevice *s,
struct comedi_insn *insn,
unsigned int *data)
{
unsigned int chan = CR_CHAN(insn->chanspec);
unsigned int oe = 0;
unsigned int mask;
int ret;
if (chan < 8)
mask = 0x000000ff;
else if (chan < 16)
mask = 0x0000ff00;
else if (chan < 24)
mask = 0x00ff0000;
else
mask = 0xff000000;
ret = comedi_dio_insn_config(dev, s, insn, data, mask);
if (ret)
return ret;
if (s->io_bits & 0x000000ff)
oe |= 0x1;
if (s->io_bits & 0x0000ff00)
oe |= 0x2;
if (s->io_bits & 0x00ff0000)
oe |= 0x4;
if (s->io_bits & 0xff000000)
oe |= 0x8;
outb(oe, dev->iobase + DT2817_CR);
return insn->n;
}
static int dt2817_dio_insn_bits(struct comedi_device *dev,
struct comedi_subdevice *s,
struct comedi_insn *insn, unsigned int *data)
{
unsigned int changed;
/* It's questionable whether it is more important in
* a driver like this to be deterministic or fast.
* We choose fast. */
if (data[0]) {
changed = s->state;
s->state &= ~data[0];
s->state |= (data[0] & data[1]);
changed ^= s->state;
changed &= s->io_bits;
if (changed & 0x000000ff)
outb(s->state & 0xff, dev->iobase + DT2817_DATA + 0);
if (changed & 0x0000ff00)
outb((s->state >> 8) & 0xff,
dev->iobase + DT2817_DATA + 1);
if (changed & 0x00ff0000)
outb((s->state >> 16) & 0xff,
dev->iobase + DT2817_DATA + 2);
if (changed & 0xff000000)
outb((s->state >> 24) & 0xff,
dev->iobase + DT2817_DATA + 3);
}
data[1] = inb(dev->iobase + DT2817_DATA + 0);
data[1] |= (inb(dev->iobase + DT2817_DATA + 1) << 8);
data[1] |= (inb(dev->iobase + DT2817_DATA + 2) << 16);
data[1] |= (inb(dev->iobase + DT2817_DATA + 3) << 24);
return insn->n;
}
static int dt2817_attach(struct comedi_device *dev, struct comedi_devconfig *it)
{
int ret;
struct comedi_subdevice *s;
ret = comedi_request_region(dev, it->options[0], DT2817_SIZE);
if (ret)
return ret;
ret = comedi_alloc_subdevices(dev, 1);
if (ret)
return ret;
s = &dev->subdevices[0];
s->n_chan = 32;
s->type = COMEDI_SUBD_DIO;
s->subdev_flags = SDF_READABLE | SDF_WRITABLE;
s->range_table = &range_digital;
s->maxdata = 1;
s->insn_bits = dt2817_dio_insn_bits;
s->insn_config = dt2817_dio_insn_config;
s->state = 0;
outb(0, dev->iobase + DT2817_CR);
return 0;
}
static struct comedi_driver dt2817_driver = {
.driver_name = "dt2817",
.module = THIS_MODULE,
.attach = dt2817_attach,
.detach = comedi_legacy_detach,
};
module_comedi_driver(dt2817_driver);
MODULE_AUTHOR("Comedi http://www.comedi.org");
MODULE_DESCRIPTION("Comedi low-level driver");
MODULE_LICENSE("GPL");
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