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/*
comedi/drivers/poc.c
Mini-drivers for POC (Piece of Crap) boards
Copyright (C) 2000 Frank Mori Hess <fmhess@users.sourceforge.net>
Copyright (C) 2001 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: poc
Description: Generic driver for very simple devices
Author: ds
Devices: [Keithley Metrabyte] DAC-02 (dac02)
Updated: Sat, 16 Mar 2002 17:34:48 -0800
Status: unknown
This driver is indended to support very simple ISA-based devices,
including:
dac02 - Keithley DAC-02 analog output board
Configuration options:
[0] - I/O port base
*/
#include <linux/module.h>
#include "../comedidev.h"
struct boarddef_struct {
const char *name;
unsigned int iosize;
int (*setup) (struct comedi_device *);
int type;
int n_chan;
int n_bits;
int (*winsn) (struct comedi_device *, struct comedi_subdevice *,
struct comedi_insn *, unsigned int *);
int (*rinsn) (struct comedi_device *, struct comedi_subdevice *,
struct comedi_insn *, unsigned int *);
int (*insnbits) (struct comedi_device *, struct comedi_subdevice *,
struct comedi_insn *, unsigned int *);
const struct comedi_lrange *range;
};
struct poc_private {
unsigned int ao_readback[32];
};
static int readback_insn(struct comedi_device *dev, struct comedi_subdevice *s,
struct comedi_insn *insn, unsigned int *data)
{
struct poc_private *devpriv = dev->private;
int chan;
chan = CR_CHAN(insn->chanspec);
data[0] = devpriv->ao_readback[chan];
return 1;
}
/* DAC-02 registers */
#define DAC02_LSB(a) (2 * a)
#define DAC02_MSB(a) (2 * a + 1)
static int dac02_ao_winsn(struct comedi_device *dev, struct comedi_subdevice *s,
struct comedi_insn *insn, unsigned int *data)
{
struct poc_private *devpriv = dev->private;
int temp;
int chan;
int output;
chan = CR_CHAN(insn->chanspec);
devpriv->ao_readback[chan] = data[0];
output = data[0];
#ifdef wrong
/* convert to complementary binary if range is bipolar */
if ((CR_RANGE(insn->chanspec) & 0x2) == 0)
output = ~output;
#endif
temp = (output << 4) & 0xf0;
outb(temp, dev->iobase + DAC02_LSB(chan));
temp = (output >> 4) & 0xff;
outb(temp, dev->iobase + DAC02_MSB(chan));
return 1;
}
static int poc_attach(struct comedi_device *dev, struct comedi_devconfig *it)
{
const struct boarddef_struct *board = comedi_board(dev);
struct poc_private *devpriv;
struct comedi_subdevice *s;
int ret;
ret = comedi_request_region(dev, it->options[0], board->iosize);
if (ret)
return ret;
ret = comedi_alloc_subdevices(dev, 1);
if (ret)
return ret;
devpriv = comedi_alloc_devpriv(dev, sizeof(*devpriv));
if (!devpriv)
return -ENOMEM;
/* analog output subdevice */
s = &dev->subdevices[0];
s->type = board->type;
s->n_chan = board->n_chan;
s->maxdata = (1 << board->n_bits) - 1;
s->range_table = board->range;
s->insn_write = board->winsn;
s->insn_read = board->rinsn;
s->insn_bits = board->insnbits;
if (s->type == COMEDI_SUBD_AO || s->type == COMEDI_SUBD_DO)
s->subdev_flags = SDF_WRITABLE;
return 0;
}
static const struct boarddef_struct boards[] = {
{
.name = "dac02",
.iosize = 8,
/* .setup = dac02_setup, */
.type = COMEDI_SUBD_AO,
.n_chan = 2,
.n_bits = 12,
.winsn = dac02_ao_winsn,
.rinsn = readback_insn,
.range = &range_unknown,
},
};
static struct comedi_driver poc_driver = {
.driver_name = "poc",
.module = THIS_MODULE,
.attach = poc_attach,
.detach = comedi_legacy_detach,
.board_name = &boards[0].name,
.num_names = ARRAY_SIZE(boards),
.offset = sizeof(boards[0]),
};
module_comedi_driver(poc_driver);
MODULE_AUTHOR("Comedi http://www.comedi.org");
MODULE_DESCRIPTION("Comedi low-level driver");
MODULE_LICENSE("GPL");
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