--- /dev/null
+/*
+ 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 "../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(comedi_device * dev, comedi_devconfig * it);
+static int das6402_detach(comedi_device * dev);
+static comedi_driver driver_das6402 = {
+ driver_name:"das6402",
+ module:THIS_MODULE,
+ attach:das6402_attach,
+ detach:das6402_detach,
+};
+
+COMEDI_INITCLEANUP(driver_das6402);
+
+typedef struct {
+ int ai_bytes_to_read;
+
+ int das6402_ignoreirq;
+} das6402_private;
+#define devpriv ((das6402_private *)dev->private)
+
+static void das6402_ai_fifo_dregs(comedi_device * dev, comedi_subdevice * s);
+
+static void das6402_setcounter(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 PT_REGS_ARG)
+{
+ comedi_device *dev = d;
+ 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(comedi_device * dev, sampl_t * data, int n)
+{
+ int i;
+
+ for (i = 0; i < n; i++)
+ data[i] = inw(dev->iobase);
+}
+#endif
+
+static void das6402_ai_fifo_dregs(comedi_device * dev, 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(comedi_device * dev, 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(comedi_device * dev, 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(sampl_t);
+
+ /* um... ignoreirq is a nasty race condition */
+ devpriv->das6402_ignoreirq = 0;
+
+ outw_p(SCANL, dev->iobase + 2);
+
+ return 0;
+}
+#endif
+
+static int board_init(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(comedi_device * dev)
+{
+ if (dev->irq)
+ comedi_free_irq(dev->irq, dev);
+ if (dev->iobase)
+ release_region(dev->iobase, DAS6402_SIZE);
+
+ return 0;
+}
+
+static int das6402_attach(comedi_device * dev, comedi_devconfig * it)
+{
+ unsigned int irq;
+ unsigned long iobase;
+ int ret;
+ 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 = comedi_request_irq(irq, intr_handler, 0, "das6402", dev);
+ if (ret < 0) {
+ printk("irq conflict\n");
+ return ret;
+ }
+ dev->irq = irq;
+
+ if ((ret = alloc_private(dev, sizeof(das6402_private))) < 0)
+ return ret;
+
+ if ((ret = alloc_subdevices(dev, 1)) < 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;
+}
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