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/*
comedi/drivers/rti802.c
Hardware 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] - dac#0 0=two's comp, 1=straight
[3] - dac#0 0=bipolar, 1=unipolar
[4] - dac#1 ...
...
[17] - dac#7 ...
*/
#include "../comedidev.h"
#include <linux/ioport.h>
#define RTI802_SIZE 4
#define RTI802_SELECT 0
#define RTI802_DATALOW 1
#define RTI802_DATAHIGH 2
struct rti802_private {
enum {
dac_2comp, dac_straight
} dac_coding[8];
const struct comedi_lrange *range_type_list[8];
unsigned int ao_readback[8];
};
static int rti802_ao_insn_read(struct comedi_device *dev,
struct comedi_subdevice *s,
struct comedi_insn *insn, unsigned int *data)
{
struct rti802_private *devpriv = dev->private;
int i;
for (i = 0; i < insn->n; i++)
data[i] = devpriv->ao_readback[CR_CHAN(insn->chanspec)];
return i;
}
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;
int i, d;
int chan = CR_CHAN(insn->chanspec);
for (i = 0; i < insn->n; i++) {
d = devpriv->ao_readback[chan] = data[i];
if (devpriv->dac_coding[chan] == dac_2comp)
d ^= 0x800;
outb(chan, dev->iobase + RTI802_SELECT);
outb(d & 0xff, dev->iobase + RTI802_DATALOW);
outb(d >> 8, dev->iobase + RTI802_DATAHIGH);
}
return i;
}
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], RTI802_SIZE);
if (ret)
return ret;
devpriv = kzalloc(sizeof(*devpriv), GFP_KERNEL);
if (!devpriv)
return -ENOMEM;
dev->private = devpriv;
ret = comedi_alloc_subdevices(dev, 1);
if (ret)
return ret;
s = &dev->subdevices[0];
/* ao subdevice */
s->type = COMEDI_SUBD_AO;
s->subdev_flags = SDF_WRITABLE;
s->maxdata = 0xfff;
s->n_chan = 8;
s->insn_read = rti802_ao_insn_read;
s->insn_write = rti802_ao_insn_write;
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 low-level driver");
MODULE_LICENSE("GPL");
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