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comedi/drivers/dt2815.c
Hardware driver for Data Translation DT2815
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.
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.
*/
/*
Driver: dt2815
Description: Data Translation DT2815
Author: ds
Status: mostly complete, untested
Devices: [Data Translation] DT2815 (dt2815)
I'm not sure anyone has ever tested this board. If you have information
contrary, please update.
Configuration options:
[0] - I/O port base base address
[1] - IRQ (unused)
[2] - Voltage unipolar/bipolar configuration
0 == unipolar 5V (0V -- +5V)
1 == bipolar 5V (-5V -- +5V)
[3] - Current offset configuration
0 == disabled (0mA -- +32mAV)
1 == enabled (+4mA -- +20mAV)
[4] - Firmware program configuration
0 == program 1 (see manual table 5-4)
1 == program 2 (see manual table 5-4)
2 == program 3 (see manual table 5-4)
3 == program 4 (see manual table 5-4)
[5] - Analog output 0 range configuration
0 == voltage
1 == current
[6] - Analog output 1 range configuration (same options)
[7] - Analog output 2 range configuration (same options)
[8] - Analog output 3 range configuration (same options)
[9] - Analog output 4 range configuration (same options)
[10] - Analog output 5 range configuration (same options)
[11] - Analog output 6 range configuration (same options)
[12] - Analog output 7 range configuration (same options)
*/
#include "../comedidev.h"
#include <linux/ioport.h>
#include <linux/delay.h>
#define DT2815_SIZE 2
#define DT2815_DATA 0
#define DT2815_STATUS 1
struct dt2815_private {
const struct comedi_lrange *range_type_list[8];
unsigned int ao_readback[8];
};
static int dt2815_wait_for_status(struct comedi_device *dev, int status)
{
int i;
for (i = 0; i < 100; i++) {
if (inb(dev->iobase + DT2815_STATUS) == status)
break;
}
return status;
}
static int dt2815_ao_insn_read(struct comedi_device *dev,
struct comedi_subdevice *s,
struct comedi_insn *insn, unsigned int *data)
{
struct dt2815_private *devpriv = dev->private;
int i;
int chan = CR_CHAN(insn->chanspec);
for (i = 0; i < insn->n; i++)
data[i] = devpriv->ao_readback[chan];
return i;
}
static int dt2815_ao_insn(struct comedi_device *dev, struct comedi_subdevice *s,
struct comedi_insn *insn, unsigned int *data)
{
struct dt2815_private *devpriv = dev->private;
int i;
int chan = CR_CHAN(insn->chanspec);
unsigned int status;
unsigned int lo, hi;
for (i = 0; i < insn->n; i++) {
lo = ((data[i] & 0x0f) << 4) | (chan << 1) | 0x01;
hi = (data[i] & 0xff0) >> 4;
status = dt2815_wait_for_status(dev, 0x00);
if (status != 0) {
printk(KERN_WARNING "dt2815: failed to write low byte "
"on %d reason %x\n", chan, status);
return -EBUSY;
}
outb(lo, dev->iobase + DT2815_DATA);
status = dt2815_wait_for_status(dev, 0x10);
if (status != 0x10) {
printk(KERN_WARNING "dt2815: failed to write high byte "
"on %d reason %x\n", chan, status);
return -EBUSY;
}
devpriv->ao_readback[chan] = data[i];
}
return i;
}
/*
options[0] Board base address
options[1] IRQ (not applicable)
options[2] Voltage unipolar/bipolar configuration
0 == unipolar 5V (0V -- +5V)
1 == bipolar 5V (-5V -- +5V)
options[3] Current offset configuration
0 == disabled (0mA -- +32mAV)
1 == enabled (+4mA -- +20mAV)
options[4] Firmware program configuration
0 == program 1 (see manual table 5-4)
1 == program 2 (see manual table 5-4)
2 == program 3 (see manual table 5-4)
3 == program 4 (see manual table 5-4)
options[5] Analog output 0 range configuration
0 == voltage
1 == current
options[6] Analog output 1 range configuration
...
options[12] Analog output 7 range configuration
0 == voltage
1 == current
*/
static int dt2815_attach(struct comedi_device *dev, struct comedi_devconfig *it)
{
struct dt2815_private *devpriv;
struct comedi_subdevice *s;
int i;
const struct comedi_lrange *current_range_type, *voltage_range_type;
int ret;
ret = comedi_request_region(dev, it->options[0], DT2815_SIZE);
if (ret)
return ret;
ret = comedi_alloc_subdevices(dev, 1);
if (ret)
return ret;
devpriv = kzalloc(sizeof(*devpriv), GFP_KERNEL);
if (!devpriv)
return -ENOMEM;
dev->private = devpriv;
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_write = dt2815_ao_insn;
s->insn_read = dt2815_ao_insn_read;
s->range_table_list = devpriv->range_type_list;
current_range_type = (it->options[3])
? &range_4_20mA : &range_0_32mA;
voltage_range_type = (it->options[2])
? &range_bipolar5 : &range_unipolar5;
for (i = 0; i < 8; i++) {
devpriv->range_type_list[i] = (it->options[5 + i])
? current_range_type : voltage_range_type;
}
/* Init the 2815 */
outb(0x00, dev->iobase + DT2815_STATUS);
for (i = 0; i < 100; i++) {
/* This is incredibly slow (approx 20 ms) */
unsigned int status;
udelay(1000);
status = inb(dev->iobase + DT2815_STATUS);
if (status == 4) {
unsigned int program;
program = (it->options[4] & 0x3) << 3 | 0x7;
outb(program, dev->iobase + DT2815_DATA);
printk(KERN_INFO ", program: 0x%x (@t=%d)\n",
program, i);
break;
} else if (status != 0x00) {
printk(KERN_WARNING "dt2815: unexpected status 0x%x "
"(@t=%d)\n", status, i);
if (status & 0x60)
outb(0x00, dev->iobase + DT2815_STATUS);
}
}
return 0;
}
static struct comedi_driver dt2815_driver = {
.driver_name = "dt2815",
.module = THIS_MODULE,
.attach = dt2815_attach,
.detach = comedi_legacy_detach,
};
module_comedi_driver(dt2815_driver);
MODULE_AUTHOR("Comedi http://www.comedi.org");
MODULE_DESCRIPTION("Comedi low-level driver");
MODULE_LICENSE("GPL");
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