Staging: comedi: add das6402 driver

/*

   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;

}