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/*
* pcmad.c
* Hardware driver for Winsystems PCM-A/D12 and PCM-A/D16
*
* COMEDI - Linux Control and Measurement Device Interface
* Copyright (C) 2000,2001 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: pcmad
* Description: Winsystems PCM-A/D12, PCM-A/D16
* Devices: (Winsystems) PCM-A/D12 [pcmad12]
* (Winsystems) PCM-A/D16 [pcmad16]
* Author: ds
* Status: untested
*
* This driver was written on a bet that I couldn't write a driver
* in less than 2 hours. I won the bet, but never got paid. =(
*
* Configuration options:
* [0] - I/O port base
* [1] - IRQ (unused)
* [2] - Analog input reference (must match jumpers)
* 0 = single-ended (16 channels)
* 1 = differential (8 channels)
* [3] - Analog input encoding (must match jumpers)
* 0 = straight binary (0-5V input range)
* 1 = two's complement (+-10V input range)
*/
#include <linux/module.h>
#include "../comedidev.h"
#define PCMAD_STATUS 0
#define PCMAD_LSB 1
#define PCMAD_MSB 2
#define PCMAD_CONVERT 1
struct pcmad_board_struct {
const char *name;
unsigned int ai_maxdata;
};
static const struct pcmad_board_struct pcmad_boards[] = {
{
.name = "pcmad12",
.ai_maxdata = 0x0fff,
}, {
.name = "pcmad16",
.ai_maxdata = 0xffff,
},
};
static int pcmad_ai_eoc(struct comedi_device *dev,
struct comedi_subdevice *s,
struct comedi_insn *insn,
unsigned long context)
{
unsigned int status;
status = inb(dev->iobase + PCMAD_STATUS);
if ((status & 0x3) == 0x3)
return 0;
return -EBUSY;
}
static int pcmad_ai_insn_read(struct comedi_device *dev,
struct comedi_subdevice *s,
struct comedi_insn *insn,
unsigned int *data)
{
unsigned int chan = CR_CHAN(insn->chanspec);
unsigned int range = CR_RANGE(insn->chanspec);
unsigned int val;
int ret;
int i;
for (i = 0; i < insn->n; i++) {
outb(chan, dev->iobase + PCMAD_CONVERT);
ret = comedi_timeout(dev, s, insn, pcmad_ai_eoc, 0);
if (ret)
return ret;
val = inb(dev->iobase + PCMAD_LSB) |
(inb(dev->iobase + PCMAD_MSB) << 8);
/* data is shifted on the pcmad12, fix it */
if (s->maxdata == 0x0fff)
val >>= 4;
if (comedi_range_is_bipolar(s, range)) {
/* munge the two's complement value */
val ^= ((s->maxdata + 1) >> 1);
}
data[i] = val;
}
return insn->n;
}
static int pcmad_attach(struct comedi_device *dev, struct comedi_devconfig *it)
{
const struct pcmad_board_struct *board = dev->board_ptr;
struct comedi_subdevice *s;
int ret;
ret = comedi_request_region(dev, it->options[0], 0x04);
if (ret)
return ret;
ret = comedi_alloc_subdevices(dev, 1);
if (ret)
return ret;
s = &dev->subdevices[0];
s->type = COMEDI_SUBD_AI;
if (it->options[1]) {
/* 8 differential channels */
s->subdev_flags = SDF_READABLE | AREF_DIFF;
s->n_chan = 8;
} else {
/* 16 single-ended channels */
s->subdev_flags = SDF_READABLE | AREF_GROUND;
s->n_chan = 16;
}
s->len_chanlist = 1;
s->maxdata = board->ai_maxdata;
s->range_table = it->options[2] ? &range_bipolar10 : &range_unipolar5;
s->insn_read = pcmad_ai_insn_read;
return 0;
}
static struct comedi_driver pcmad_driver = {
.driver_name = "pcmad",
.module = THIS_MODULE,
.attach = pcmad_attach,
.detach = comedi_legacy_detach,
.board_name = &pcmad_boards[0].name,
.num_names = ARRAY_SIZE(pcmad_boards),
.offset = sizeof(pcmad_boards[0]),
};
module_comedi_driver(pcmad_driver);
MODULE_AUTHOR("Comedi http://www.comedi.org");
MODULE_DESCRIPTION("Comedi low-level driver");
MODULE_LICENSE("GPL");
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