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Some comments on the code..
- it shouldn't be necessary to use outb_p().
- ignoreirq creates a race condition. It needs to be fixed.
*/
/*
comedi/drivers/das6402.c
An experimental driver for Computerboards' DAS6402 I/O card
Copyright (C) 1999 Oystein Svendsen <svendsen@pvv.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.
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: das6402
Description: Keithley Metrabyte DAS6402 (& compatibles)
Author: Oystein Svendsen <svendsen@pvv.org>
Status: bitrotten
Devices: [Keithley Metrabyte] DAS6402 (das6402)
This driver has suffered bitrot.
*/
#include <linux/interrupt.h>
#include "../comedidev.h"
#include <linux/ioport.h>
#define DAS6402_SIZE 16
#define N_WORDS (3000*64)
#define STOP 0
#define START 1
#define SCANL 0x3f00
#define BYTE unsigned char
#define WORD unsigned short
/*----- register 8 ----*/
#define CLRINT 0x01
#define CLRXTR 0x02
#define CLRXIN 0x04
#define EXTEND 0x10
#define ARMED 0x20 /* enable conting of post sample conv */
#define POSTMODE 0x40
#define MHZ 0x80 /* 10 MHz clock */
/*---------------------*/
/*----- register 9 ----*/
#define IRQ (0x04 << 4) /* these two are */
#define IRQV 10 /* dependent on each other */
#define CONVSRC 0x03 /* trig src is Intarnal pacer */
#define BURSTEN 0x04 /* enable burst */
#define XINTE 0x08 /* use external int. trig */
#define INTE 0x80 /* enable analog interrupts */
/*---------------------*/
/*----- register 10 ---*/
#define TGEN 0x01 /* Use pin DI1 for externl trigging? */
#define TGSEL 0x02 /* Use edge triggering */
#define TGPOL 0x04 /* active edge is falling */
#define PRETRIG 0x08 /* pretrig */
/*---------------------*/
/*----- register 11 ---*/
#define EOB 0x0c
#define FIFOHFULL 0x08
#define GAIN 0x01
#define FIFONEPTY 0x04
#define MODE 0x10
#define SEM 0x20
#define BIP 0x40
/*---------------------*/
#define M0 0x00
#define M2 0x04
#define C0 0x00
#define C1 0x40
#define C2 0x80
#define RWLH 0x30
static int das6402_attach(struct comedi_device *dev,
struct comedi_devconfig *it);
static int das6402_detach(struct comedi_device *dev);
static struct comedi_driver driver_das6402 = {
.driver_name = "das6402",
.module = THIS_MODULE,
.attach = das6402_attach,
.detach = das6402_detach,
};
static int __init driver_das6402_init_module(void)
{
return comedi_driver_register(&driver_das6402);
}
static void __exit driver_das6402_cleanup_module(void)
{
comedi_driver_unregister(&driver_das6402);
}
module_init(driver_das6402_init_module);
module_exit(driver_das6402_cleanup_module);
struct das6402_private {
int ai_bytes_to_read;
int das6402_ignoreirq;
};
#define devpriv ((struct das6402_private *)dev->private)
static void das6402_ai_fifo_dregs(struct comedi_device *dev,
struct comedi_subdevice *s);
static void das6402_setcounter(struct comedi_device *dev)
{
BYTE p;
unsigned short ctrlwrd;
/* set up counter0 first, mode 0 */
p = M0 | C0 | RWLH;
outb_p(p, dev->iobase + 15);
ctrlwrd = 2000;
p = (BYTE) (0xff & ctrlwrd);
outb_p(p, dev->iobase + 12);
p = (BYTE) (0xff & (ctrlwrd >> 8));
outb_p(p, dev->iobase + 12);
/* set up counter1, mode 2 */
p = M2 | C1 | RWLH;
outb_p(p, dev->iobase + 15);
ctrlwrd = 10;
p = (BYTE) (0xff & ctrlwrd);
outb_p(p, dev->iobase + 13);
p = (BYTE) (0xff & (ctrlwrd >> 8));
outb_p(p, dev->iobase + 13);
/* set up counter1, mode 2 */
p = M2 | C2 | RWLH;
outb_p(p, dev->iobase + 15);
ctrlwrd = 1000;
p = (BYTE) (0xff & ctrlwrd);
outb_p(p, dev->iobase + 14);
p = (BYTE) (0xff & (ctrlwrd >> 8));
outb_p(p, dev->iobase + 14);
}
static irqreturn_t intr_handler(int irq, void *d)
{
struct comedi_device *dev = d;
struct comedi_subdevice *s = dev->subdevices;
if (!dev->attached || devpriv->das6402_ignoreirq) {
printk("das6402: BUG: spurious interrupt\n");
return IRQ_HANDLED;
}
#ifdef DEBUG
printk("das6402: interrupt! das6402_irqcount=%i\n",
devpriv->das6402_irqcount);
printk("das6402: iobase+2=%i\n", inw_p(dev->iobase + 2));
#endif
das6402_ai_fifo_dregs(dev, s);
if (s->async->buf_write_count >= devpriv->ai_bytes_to_read) {
outw_p(SCANL, dev->iobase + 2); /* clears the fifo */
outb(0x07, dev->iobase + 8); /* clears all flip-flops */
#ifdef DEBUG
printk("das6402: Got %i samples\n\n",
devpriv->das6402_wordsread - diff);
#endif
s->async->events |= COMEDI_CB_EOA;
comedi_event(dev, s);
}
outb(0x01, dev->iobase + 8); /* clear only the interrupt flip-flop */
comedi_event(dev, s);
return IRQ_HANDLED;
}
#if 0
static void das6402_ai_fifo_read(struct comedi_device *dev, short *data, int n)
{
int i;
for (i = 0; i < n; i++)
data[i] = inw(dev->iobase);
}
#endif
static void das6402_ai_fifo_dregs(struct comedi_device *dev,
struct comedi_subdevice *s)
{
while (1) {
if (!(inb(dev->iobase + 8) & 0x01))
return;
comedi_buf_put(s->async, inw(dev->iobase));
}
}
static int das6402_ai_cancel(struct comedi_device *dev,
struct comedi_subdevice *s)
{
/*
* This function should reset the board from whatever condition it
* is in (i.e., acquiring data), to a non-active state.
*/
devpriv->das6402_ignoreirq = 1;
#ifdef DEBUG
printk("das6402: Stopping acquisition\n");
#endif
devpriv->das6402_ignoreirq = 1;
outb_p(0x02, dev->iobase + 10); /* disable external trigging */
outw_p(SCANL, dev->iobase + 2); /* resets the card fifo */
outb_p(0, dev->iobase + 9); /* disables interrupts */
outw_p(SCANL, dev->iobase + 2);
return 0;
}
#ifdef unused
static int das6402_ai_mode2(struct comedi_device *dev,
struct comedi_subdevice *s, comedi_trig * it)
{
devpriv->das6402_ignoreirq = 1;
#ifdef DEBUG
printk("das6402: Starting acquisition\n");
#endif
outb_p(0x03, dev->iobase + 10); /* enable external trigging */
outw_p(SCANL, dev->iobase + 2); /* resets the card fifo */
outb_p(IRQ | CONVSRC | BURSTEN | INTE, dev->iobase + 9);
devpriv->ai_bytes_to_read = it->n * sizeof(short);
/* um... ignoreirq is a nasty race condition */
devpriv->das6402_ignoreirq = 0;
outw_p(SCANL, dev->iobase + 2);
return 0;
}
#endif
static int board_init(struct comedi_device *dev)
{
BYTE b;
devpriv->das6402_ignoreirq = 1;
outb(0x07, dev->iobase + 8);
/* register 11 */
outb_p(MODE, dev->iobase + 11);
b = BIP | SEM | MODE | GAIN | FIFOHFULL;
outb_p(b, dev->iobase + 11);
/* register 8 */
outb_p(EXTEND, dev->iobase + 8);
b = EXTEND | MHZ;
outb_p(b, dev->iobase + 8);
b = MHZ | CLRINT | CLRXTR | CLRXIN;
outb_p(b, dev->iobase + 8);
/* register 9 */
b = IRQ | CONVSRC | BURSTEN | INTE;
outb_p(b, dev->iobase + 9);
/* register 10 */
b = TGSEL | TGEN;
outb_p(b, dev->iobase + 10);
b = 0x07;
outb_p(b, dev->iobase + 8);
das6402_setcounter(dev);
outw_p(SCANL, dev->iobase + 2); /* reset card fifo */
devpriv->das6402_ignoreirq = 0;
return 0;
}
static int das6402_detach(struct comedi_device *dev)
{
if (dev->irq)
free_irq(dev->irq, dev);
if (dev->iobase)
release_region(dev->iobase, DAS6402_SIZE);
return 0;
}
static int das6402_attach(struct comedi_device *dev,
struct comedi_devconfig *it)
{
unsigned int irq;
unsigned long iobase;
int ret;
struct comedi_subdevice *s;
dev->board_name = "das6402";
iobase = it->options[0];
if (iobase == 0)
iobase = 0x300;
printk("comedi%d: das6402: 0x%04lx", dev->minor, iobase);
if (!request_region(iobase, DAS6402_SIZE, "das6402")) {
printk(" I/O port conflict\n");
return -EIO;
}
dev->iobase = iobase;
/* should do a probe here */
irq = it->options[0];
printk(" ( irq = %u )", irq);
ret = request_irq(irq, intr_handler, 0, "das6402", dev);
if (ret < 0) {
printk("irq conflict\n");
return ret;
}
dev->irq = irq;
ret = alloc_private(dev, sizeof(struct das6402_private));
if (ret < 0)
return ret;
ret = alloc_subdevices(dev, 1);
if (ret < 0)
return ret;
/* ai subdevice */
s = dev->subdevices + 0;
s->type = COMEDI_SUBD_AI;
s->subdev_flags = SDF_READABLE | SDF_GROUND;
s->n_chan = 8;
/* s->trig[2]=das6402_ai_mode2; */
s->cancel = das6402_ai_cancel;
s->maxdata = (1 << 12) - 1;
s->len_chanlist = 16; /* ? */
s->range_table = &range_unknown;
board_init(dev);
return 0;
}
MODULE_AUTHOR("Comedi http://www.comedi.org");
MODULE_DESCRIPTION("Comedi low-level driver");
MODULE_LICENSE("GPL");
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