// SPDX-License-Identifier: GPL-2.0+
|
/*
|
* 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>
|
*/
|
/*
|
* 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_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 long iobase = dev->iobase + DT2817_DATA;
|
unsigned int mask;
|
unsigned int val;
|
|
mask = comedi_dio_update_state(s, data);
|
if (mask) {
|
if (mask & 0x000000ff)
|
outb(s->state & 0xff, iobase + 0);
|
if (mask & 0x0000ff00)
|
outb((s->state >> 8) & 0xff, iobase + 1);
|
if (mask & 0x00ff0000)
|
outb((s->state >> 16) & 0xff, iobase + 2);
|
if (mask & 0xff000000)
|
outb((s->state >> 24) & 0xff, iobase + 3);
|
}
|
|
val = inb(iobase + 0);
|
val |= (inb(iobase + 1) << 8);
|
val |= (inb(iobase + 2) << 16);
|
val |= (inb(iobase + 3) << 24);
|
|
data[1] = val;
|
|
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], 0x5);
|
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 https://www.comedi.org");
|
MODULE_DESCRIPTION("Comedi low-level driver");
|
MODULE_LICENSE("GPL");
|
