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/*
* rti802.c
* Comedi driver for Analog Devices RTI-802 board
*
* COMEDI - Linux Control and Measurement Device Interface
* Copyright (C) 1999 Anders Blomdell <anders.blomdell@control.lth.se>
*
* 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: rti802
* Description: Analog Devices RTI-802
* Author: Anders Blomdell <anders.blomdell@control.lth.se>
* Devices: (Analog Devices) RTI-802 [rti802]
* Status: works
*
* Configuration Options:
* [0] - i/o base
* [1] - unused
* [2,4,6,8,10,12,14,16] - dac#[0-7] 0=two's comp, 1=straight
* [3,5,7,9,11,13,15,17] - dac#[0-7] 0=bipolar, 1=unipolar
*/
#include <linux/module.h>
#include "../comedidev.h"
/*
* Register I/O map
*/
#define RTI802_SELECT 0x00
#define RTI802_DATALOW 0x01
#define RTI802_DATAHIGH 0x02
struct rti802_private {
enum {
dac_2comp, dac_straight
} dac_coding[8];
const struct comedi_lrange *range_type_list[8];
};
static int rti802_ao_insn_write(struct comedi_device *dev,
struct comedi_subdevice *s,
struct comedi_insn *insn,
unsigned int *data)
{
struct rti802_private *devpriv = dev->private;
unsigned int chan = CR_CHAN(insn->chanspec);
int i;
outb(chan, dev->iobase + RTI802_SELECT);
for (i = 0; i < insn->n; i++) {
unsigned int val = data[i];
s->readback[chan] = val;
/* munge offset binary to two's complement if needed */
if (devpriv->dac_coding[chan] == dac_2comp)
val = comedi_offset_munge(s, val);
outb(val & 0xff, dev->iobase + RTI802_DATALOW);
outb((val >> 8) & 0xff, dev->iobase + RTI802_DATAHIGH);
}
return insn->n;
}
static int rti802_attach(struct comedi_device *dev, struct comedi_devconfig *it)
{
struct rti802_private *devpriv;
struct comedi_subdevice *s;
int i;
int ret;
ret = comedi_request_region(dev, it->options[0], 0x04);
if (ret)
return ret;
devpriv = comedi_alloc_devpriv(dev, sizeof(*devpriv));
if (!devpriv)
return -ENOMEM;
ret = comedi_alloc_subdevices(dev, 1);
if (ret)
return ret;
/* Analog Output subdevice */
s = &dev->subdevices[0];
s->type = COMEDI_SUBD_AO;
s->subdev_flags = SDF_WRITABLE;
s->maxdata = 0xfff;
s->n_chan = 8;
s->insn_write = rti802_ao_insn_write;
s->insn_read = comedi_readback_insn_read;
ret = comedi_alloc_subdev_readback(s);
if (ret)
return ret;
s->range_table_list = devpriv->range_type_list;
for (i = 0; i < 8; i++) {
devpriv->dac_coding[i] = (it->options[3 + 2 * i])
? (dac_straight) : (dac_2comp);
devpriv->range_type_list[i] = (it->options[2 + 2 * i])
? &range_unipolar10 : &range_bipolar10;
}
return 0;
}
static struct comedi_driver rti802_driver = {
.driver_name = "rti802",
.module = THIS_MODULE,
.attach = rti802_attach,
.detach = comedi_legacy_detach,
};
module_comedi_driver(rti802_driver);
MODULE_AUTHOR("Comedi http://www.comedi.org");
MODULE_DESCRIPTION("Comedi driver for Analog Devices RTI-802 board");
MODULE_LICENSE("GPL");
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