// SPDX-License-Identifier: GPL-2.0+
|
/*
|
* comedi/drivers/dt2814.c
|
* Hardware driver for Data Translation DT2814
|
*
|
* COMEDI - Linux Control and Measurement Device Interface
|
* Copyright (C) 1998 David A. Schleef <ds@schleef.org>
|
*/
|
/*
|
* Driver: dt2814
|
* Description: Data Translation DT2814
|
* Author: ds
|
* Status: complete
|
* Devices: [Data Translation] DT2814 (dt2814)
|
*
|
* Configuration options:
|
* [0] - I/O port base address
|
* [1] - IRQ
|
*
|
* This card has 16 analog inputs multiplexed onto a 12 bit ADC. There
|
* is a minimally useful onboard clock. The base frequency for the
|
* clock is selected by jumpers, and the clock divider can be selected
|
* via programmed I/O. Unfortunately, the clock divider can only be
|
* a power of 10, from 1 to 10^7, of which only 3 or 4 are useful. In
|
* addition, the clock does not seem to be very accurate.
|
*/
|
|
#include <linux/module.h>
|
#include <linux/interrupt.h>
|
#include "../comedidev.h"
|
|
#include <linux/delay.h>
|
|
#define DT2814_CSR 0
|
#define DT2814_DATA 1
|
|
/*
|
* flags
|
*/
|
|
#define DT2814_FINISH 0x80
|
#define DT2814_ERR 0x40
|
#define DT2814_BUSY 0x20
|
#define DT2814_ENB 0x10
|
#define DT2814_CHANMASK 0x0f
|
|
struct dt2814_private {
|
int ntrig;
|
int curadchan;
|
};
|
|
#define DT2814_TIMEOUT 10
|
#define DT2814_MAX_SPEED 100000 /* Arbitrary 10 khz limit */
|
|
static int dt2814_ai_eoc(struct comedi_device *dev,
|
struct comedi_subdevice *s,
|
struct comedi_insn *insn,
|
unsigned long context)
|
{
|
unsigned int status;
|
|
status = inb(dev->iobase + DT2814_CSR);
|
if (status & DT2814_FINISH)
|
return 0;
|
return -EBUSY;
|
}
|
|
static int dt2814_ai_insn_read(struct comedi_device *dev,
|
struct comedi_subdevice *s,
|
struct comedi_insn *insn, unsigned int *data)
|
{
|
int n, hi, lo;
|
int chan;
|
int ret;
|
|
for (n = 0; n < insn->n; n++) {
|
chan = CR_CHAN(insn->chanspec);
|
|
outb(chan, dev->iobase + DT2814_CSR);
|
|
ret = comedi_timeout(dev, s, insn, dt2814_ai_eoc, 0);
|
if (ret)
|
return ret;
|
|
hi = inb(dev->iobase + DT2814_DATA);
|
lo = inb(dev->iobase + DT2814_DATA);
|
|
data[n] = (hi << 4) | (lo >> 4);
|
}
|
|
return n;
|
}
|
|
static int dt2814_ns_to_timer(unsigned int *ns, unsigned int flags)
|
{
|
int i;
|
unsigned int f;
|
|
/* XXX ignores flags */
|
|
f = 10000; /* ns */
|
for (i = 0; i < 8; i++) {
|
if ((2 * (*ns)) < (f * 11))
|
break;
|
f *= 10;
|
}
|
|
*ns = f;
|
|
return i;
|
}
|
|
static int dt2814_ai_cmdtest(struct comedi_device *dev,
|
struct comedi_subdevice *s, struct comedi_cmd *cmd)
|
{
|
int err = 0;
|
unsigned int arg;
|
|
/* Step 1 : check if triggers are trivially valid */
|
|
err |= comedi_check_trigger_src(&cmd->start_src, TRIG_NOW);
|
err |= comedi_check_trigger_src(&cmd->scan_begin_src, TRIG_TIMER);
|
err |= comedi_check_trigger_src(&cmd->convert_src, TRIG_NOW);
|
err |= comedi_check_trigger_src(&cmd->scan_end_src, TRIG_COUNT);
|
err |= comedi_check_trigger_src(&cmd->stop_src, TRIG_COUNT | TRIG_NONE);
|
|
if (err)
|
return 1;
|
|
/* Step 2a : make sure trigger sources are unique */
|
|
err |= comedi_check_trigger_is_unique(cmd->stop_src);
|
|
/* Step 2b : and mutually compatible */
|
|
if (err)
|
return 2;
|
|
/* Step 3: check if arguments are trivially valid */
|
|
err |= comedi_check_trigger_arg_is(&cmd->start_arg, 0);
|
|
err |= comedi_check_trigger_arg_max(&cmd->scan_begin_arg, 1000000000);
|
err |= comedi_check_trigger_arg_min(&cmd->scan_begin_arg,
|
DT2814_MAX_SPEED);
|
|
err |= comedi_check_trigger_arg_is(&cmd->scan_end_arg,
|
cmd->chanlist_len);
|
|
if (cmd->stop_src == TRIG_COUNT)
|
err |= comedi_check_trigger_arg_min(&cmd->stop_arg, 2);
|
else /* TRIG_NONE */
|
err |= comedi_check_trigger_arg_is(&cmd->stop_arg, 0);
|
|
if (err)
|
return 3;
|
|
/* step 4: fix up any arguments */
|
|
arg = cmd->scan_begin_arg;
|
dt2814_ns_to_timer(&arg, cmd->flags);
|
err |= comedi_check_trigger_arg_is(&cmd->scan_begin_arg, arg);
|
|
if (err)
|
return 4;
|
|
return 0;
|
}
|
|
static int dt2814_ai_cmd(struct comedi_device *dev, struct comedi_subdevice *s)
|
{
|
struct dt2814_private *devpriv = dev->private;
|
struct comedi_cmd *cmd = &s->async->cmd;
|
int chan;
|
int trigvar;
|
|
trigvar = dt2814_ns_to_timer(&cmd->scan_begin_arg, cmd->flags);
|
|
chan = CR_CHAN(cmd->chanlist[0]);
|
|
devpriv->ntrig = cmd->stop_arg;
|
outb(chan | DT2814_ENB | (trigvar << 5), dev->iobase + DT2814_CSR);
|
|
return 0;
|
}
|
|
static irqreturn_t dt2814_interrupt(int irq, void *d)
|
{
|
int lo, hi;
|
struct comedi_device *dev = d;
|
struct dt2814_private *devpriv = dev->private;
|
struct comedi_subdevice *s = dev->read_subdev;
|
int data;
|
|
if (!dev->attached) {
|
dev_err(dev->class_dev, "spurious interrupt\n");
|
return IRQ_HANDLED;
|
}
|
|
hi = inb(dev->iobase + DT2814_DATA);
|
lo = inb(dev->iobase + DT2814_DATA);
|
|
data = (hi << 4) | (lo >> 4);
|
|
if (!(--devpriv->ntrig)) {
|
int i;
|
|
outb(0, dev->iobase + DT2814_CSR);
|
/*
|
* note: turning off timed mode triggers another
|
* sample.
|
*/
|
|
for (i = 0; i < DT2814_TIMEOUT; i++) {
|
if (inb(dev->iobase + DT2814_CSR) & DT2814_FINISH)
|
break;
|
}
|
inb(dev->iobase + DT2814_DATA);
|
inb(dev->iobase + DT2814_DATA);
|
|
s->async->events |= COMEDI_CB_EOA;
|
}
|
comedi_handle_events(dev, s);
|
return IRQ_HANDLED;
|
}
|
|
static int dt2814_attach(struct comedi_device *dev, struct comedi_devconfig *it)
|
{
|
struct dt2814_private *devpriv;
|
struct comedi_subdevice *s;
|
int ret;
|
int i;
|
|
ret = comedi_request_region(dev, it->options[0], 0x2);
|
if (ret)
|
return ret;
|
|
outb(0, dev->iobase + DT2814_CSR);
|
usleep_range(100, 200);
|
if (inb(dev->iobase + DT2814_CSR) & DT2814_ERR) {
|
dev_err(dev->class_dev, "reset error (fatal)\n");
|
return -EIO;
|
}
|
i = inb(dev->iobase + DT2814_DATA);
|
i = inb(dev->iobase + DT2814_DATA);
|
|
if (it->options[1]) {
|
ret = request_irq(it->options[1], dt2814_interrupt, 0,
|
dev->board_name, dev);
|
if (ret == 0)
|
dev->irq = it->options[1];
|
}
|
|
ret = comedi_alloc_subdevices(dev, 1);
|
if (ret)
|
return ret;
|
|
devpriv = comedi_alloc_devpriv(dev, sizeof(*devpriv));
|
if (!devpriv)
|
return -ENOMEM;
|
|
s = &dev->subdevices[0];
|
s->type = COMEDI_SUBD_AI;
|
s->subdev_flags = SDF_READABLE | SDF_GROUND;
|
s->n_chan = 16; /* XXX */
|
s->insn_read = dt2814_ai_insn_read;
|
s->maxdata = 0xfff;
|
s->range_table = &range_unknown; /* XXX */
|
if (dev->irq) {
|
dev->read_subdev = s;
|
s->subdev_flags |= SDF_CMD_READ;
|
s->len_chanlist = 1;
|
s->do_cmd = dt2814_ai_cmd;
|
s->do_cmdtest = dt2814_ai_cmdtest;
|
}
|
|
return 0;
|
}
|
|
static struct comedi_driver dt2814_driver = {
|
.driver_name = "dt2814",
|
.module = THIS_MODULE,
|
.attach = dt2814_attach,
|
.detach = comedi_legacy_detach,
|
};
|
module_comedi_driver(dt2814_driver);
|
|
MODULE_AUTHOR("Comedi http://www.comedi.org");
|
MODULE_DESCRIPTION("Comedi low-level driver");
|
MODULE_LICENSE("GPL");
|
