[deliverable/linux.git] / drivers / staging / comedi / drivers / das6402.c

/*
   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

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)
{
	while (1) {
		if (!(inb(dev->iobase + 8) & 0x01))
			return;
		comedi_buf_put(s->async, inw(dev->iobase));
	}
}

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[0];

	if (!dev->attached || devpriv->das6402_ignoreirq) {
		dev_warn(dev->class_dev, "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 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;
	dev_dbg(dev->class_dev, "Stopping acquisition\n");
	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;
	dev_dbg(dev->class_dev, "Starting acquisition\n");
	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_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;

	if (!request_region(iobase, DAS6402_SIZE, "das6402")) {
		dev_err(dev->class_dev, "I/O port conflict\n");
		return -EIO;
	}
	dev->iobase = iobase;

	/* should do a probe here */

	irq = it->options[0];
	dev_dbg(dev->class_dev, "( irq = %u )\n", irq);
	ret = request_irq(irq, intr_handler, 0, "das6402", dev);
	if (ret < 0)
		return ret;

	dev->irq = irq;
	ret = alloc_private(dev, sizeof(struct das6402_private));
	if (ret < 0)
		return ret;

	ret = comedi_alloc_subdevices(dev, 1);
	if (ret)
		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;
}

static void das6402_detach(struct comedi_device *dev)
{
	if (dev->irq)
		free_irq(dev->irq, dev);
	if (dev->iobase)
		release_region(dev->iobase, DAS6402_SIZE);
}

static struct comedi_driver das6402_driver = {
	.driver_name	= "das6402",
	.module		= THIS_MODULE,
	.attach		= das6402_attach,
	.detach		= das6402_detach,
};
module_comedi_driver(das6402_driver)

MODULE_AUTHOR("Comedi http://www.comedi.org");
MODULE_DESCRIPTION("Comedi low-level driver");
MODULE_LICENSE("GPL");
Commit	Line	Data
48f16b6a OS	1	/*
	2	Some comments on the code..
	3
	4	- it shouldn't be necessary to use outb_p().
	5
	6	- ignoreirq creates a race condition. It needs to be fixed.
	7
	8	*/
	9
	10	/*
	11	comedi/drivers/das6402.c
	12	An experimental driver for Computerboards' DAS6402 I/O card
	13
	14	Copyright (C) 1999 Oystein Svendsen <svendsen@pvv.org>
	15
	16	This program is free software; you can redistribute it and/or modify
	17	it under the terms of the GNU General Public License as published by
	18	the Free Software Foundation; either version 2 of the License, or
	19	(at your option) any later version.
	20
	21	This program is distributed in the hope that it will be useful,
	22	but WITHOUT ANY WARRANTY; without even the implied warranty of
	23	MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
	24	GNU General Public License for more details.
	25
	26	You should have received a copy of the GNU General Public License
	27	along with this program; if not, write to the Free Software
	28	Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
	29
	30	*/
	31	/*
	32	Driver: das6402
	33	Description: Keithley Metrabyte DAS6402 (& compatibles)
	34	Author: Oystein Svendsen <svendsen@pvv.org>
	35	Status: bitrotten
	36	Devices: [Keithley Metrabyte] DAS6402 (das6402)
	37
	38	This driver has suffered bitrot.
	39	*/
	40
25436dc9	41	#include <linux/interrupt.h>
48f16b6a OS	42	#include "../comedidev.h"
	43
	44	#include <linux/ioport.h>
	45
	46	#define DAS6402_SIZE 16
	47
ecd89ddc	48	#define N_WORDS (3000*64)
48f16b6a OS	49
	50	#define STOP 0
	51	#define START 1
	52
	53	#define SCANL 0x3f00
	54	#define BYTE unsigned char
	55	#define WORD unsigned short
	56
	57	/----- register 8 ----/
	58	#define CLRINT 0x01
	59	#define CLRXTR 0x02
	60	#define CLRXIN 0x04
	61	#define EXTEND 0x10
	62	#define ARMED 0x20 /* enable conting of post sample conv */
	63	#define POSTMODE 0x40
	64	#define MHZ 0x80 /* 10 MHz clock */
	65	/---------------------/
	66
	67	/----- register 9 ----/
	68	#define IRQ (0x04 << 4) /* these two are */
	69	#define IRQV 10 /* dependent on each other */
	70
	71	#define CONVSRC 0x03 /* trig src is Intarnal pacer */
	72	#define BURSTEN 0x04 /* enable burst */
	73	#define XINTE 0x08 /* use external int. trig */
	74	#define INTE 0x80 /* enable analog interrupts */
	75	/---------------------/
	76
	77	/----- register 10 ---/
	78	#define TGEN 0x01 /* Use pin DI1 for externl trigging? */
	79	#define TGSEL 0x02 /* Use edge triggering */
	80	#define TGPOL 0x04 /* active edge is falling */
	81	#define PRETRIG 0x08 /* pretrig */
	82	/---------------------/
	83
	84	/----- register 11 ---/
	85	#define EOB 0x0c
	86	#define FIFOHFULL 0x08
	87	#define GAIN 0x01
	88	#define FIFONEPTY 0x04
	89	#define MODE 0x10
	90	#define SEM 0x20
	91	#define BIP 0x40
	92	/---------------------/
	93
	94	#define M0 0x00
	95	#define M2 0x04
	96
	97	#define C0 0x00
	98	#define C1 0x40
	99	#define C2 0x80
	100	#define RWLH 0x30
	101
c7b8bb98	102	struct das6402_private {
48f16b6a OS	103	int ai_bytes_to_read;
	104
	105	int das6402_ignoreirq;
c7b8bb98 BP	106	};
c7b8bb98 BP	107	#define devpriv ((struct das6402_private *)dev->private)
48f16b6a	108
0a85b6f0	109	static void das6402_ai_fifo_dregs(struct comedi_device *dev,
71e7271b HS	110	struct comedi_subdevice *s)
	111	{
	112	while (1) {
	113	if (!(inb(dev->iobase + 8) & 0x01))
	114	return;
	115	comedi_buf_put(s->async, inw(dev->iobase));
	116	}
	117	}
48f16b6a	118
da91b269	119	static void das6402_setcounter(struct comedi_device *dev)
48f16b6a OS	120	{
	121	BYTE p;
	122	unsigned short ctrlwrd;
	123
	124	/* set up counter0 first, mode 0 */
	125	p = M0 \| C0 \| RWLH;
	126	outb_p(p, dev->iobase + 15);
	127	ctrlwrd = 2000;
	128	p = (BYTE) (0xff & ctrlwrd);
	129	outb_p(p, dev->iobase + 12);
	130	p = (BYTE) (0xff & (ctrlwrd >> 8));
	131	outb_p(p, dev->iobase + 12);
	132
	133	/* set up counter1, mode 2 */
	134	p = M2 \| C1 \| RWLH;
	135	outb_p(p, dev->iobase + 15);
	136	ctrlwrd = 10;
	137	p = (BYTE) (0xff & ctrlwrd);
	138	outb_p(p, dev->iobase + 13);
	139	p = (BYTE) (0xff & (ctrlwrd >> 8));
	140	outb_p(p, dev->iobase + 13);
	141
	142	/* set up counter1, mode 2 */
	143	p = M2 \| C2 \| RWLH;
	144	outb_p(p, dev->iobase + 15);
	145	ctrlwrd = 1000;
	146	p = (BYTE) (0xff & ctrlwrd);
	147	outb_p(p, dev->iobase + 14);
	148	p = (BYTE) (0xff & (ctrlwrd >> 8));
	149	outb_p(p, dev->iobase + 14);
	150	}
	151
70265d24	152	static irqreturn_t intr_handler(int irq, void *d)
48f16b6a	153	{
71b5f4f1	154	struct comedi_device *dev = d;
92cfef5d	155	struct comedi_subdevice *s = &dev->subdevices[0];
48f16b6a OS	156
48f16b6a OS	157	if (!dev->attached \|\| devpriv->das6402_ignoreirq) {
f41ad667	158	dev_warn(dev->class_dev, "BUG: spurious interrupt\n");
48f16b6a OS	159	return IRQ_HANDLED;
	160	}
	161	#ifdef DEBUG
	162	printk("das6402: interrupt! das6402_irqcount=%i\n",
0a85b6f0	163	devpriv->das6402_irqcount);
48f16b6a OS	164	printk("das6402: iobase+2=%i\n", inw_p(dev->iobase + 2));
	165	#endif
	166
	167	das6402_ai_fifo_dregs(dev, s);
	168
	169	if (s->async->buf_write_count >= devpriv->ai_bytes_to_read) {
	170	outw_p(SCANL, dev->iobase + 2); /* clears the fifo */
	171	outb(0x07, dev->iobase + 8); /* clears all flip-flops */
	172	#ifdef DEBUG
	173	printk("das6402: Got %i samples\n\n",
0a85b6f0	174	devpriv->das6402_wordsread - diff);
48f16b6a OS	175	#endif
	176	s->async->events \|= COMEDI_CB_EOA;
	177	comedi_event(dev, s);
	178	}
	179
	180	outb(0x01, dev->iobase + 8); /* clear only the interrupt flip-flop */
	181
	182	comedi_event(dev, s);
	183	return IRQ_HANDLED;
	184	}
	185
	186	#if 0
da91b269	187	static void das6402_ai_fifo_read(struct comedi_device dev, short data, int n)
48f16b6a OS	188	{
	189	int i;
	190
	191	for (i = 0; i < n; i++)
	192	data[i] = inw(dev->iobase);
	193	}
	194	#endif
	195
0a85b6f0 MT	196	static int das6402_ai_cancel(struct comedi_device *dev,
0a85b6f0 MT	197	struct comedi_subdevice *s)
48f16b6a OS	198	{
	199	/*
	200	* This function should reset the board from whatever condition it
	201	* is in (i.e., acquiring data), to a non-active state.
	202	*/
	203
	204	devpriv->das6402_ignoreirq = 1;
f41ad667	205	dev_dbg(dev->class_dev, "Stopping acquisition\n");
48f16b6a OS	206	devpriv->das6402_ignoreirq = 1;
	207	outb_p(0x02, dev->iobase + 10); /* disable external trigging */
	208	outw_p(SCANL, dev->iobase + 2); /* resets the card fifo */
	209	outb_p(0, dev->iobase + 9); /* disables interrupts */
	210
	211	outw_p(SCANL, dev->iobase + 2);
	212
	213	return 0;
	214	}
	215
	216	#ifdef unused
0a85b6f0 MT	217	static int das6402_ai_mode2(struct comedi_device *dev,
0a85b6f0 MT	218	struct comedi_subdevice s, comedi_trig it)
48f16b6a OS	219	{
48f16b6a OS	220	devpriv->das6402_ignoreirq = 1;
f41ad667	221	dev_dbg(dev->class_dev, "Starting acquisition\n");
48f16b6a OS	222	outb_p(0x03, dev->iobase + 10); /* enable external trigging */
	223	outw_p(SCANL, dev->iobase + 2); /* resets the card fifo */
	224	outb_p(IRQ \| CONVSRC \| BURSTEN \| INTE, dev->iobase + 9);
	225
790c5541	226	devpriv->ai_bytes_to_read = it->n * sizeof(short);
48f16b6a OS	227
	228	/* um... ignoreirq is a nasty race condition */
	229	devpriv->das6402_ignoreirq = 0;
	230
	231	outw_p(SCANL, dev->iobase + 2);
	232
	233	return 0;
	234	}
	235	#endif
	236
da91b269	237	static int board_init(struct comedi_device *dev)
48f16b6a OS	238	{
	239	BYTE b;
	240
	241	devpriv->das6402_ignoreirq = 1;
	242
	243	outb(0x07, dev->iobase + 8);
	244
	245	/* register 11 */
	246	outb_p(MODE, dev->iobase + 11);
	247	b = BIP \| SEM \| MODE \| GAIN \| FIFOHFULL;
	248	outb_p(b, dev->iobase + 11);
	249
	250	/* register 8 */
	251	outb_p(EXTEND, dev->iobase + 8);
	252	b = EXTEND \| MHZ;
	253	outb_p(b, dev->iobase + 8);
	254	b = MHZ \| CLRINT \| CLRXTR \| CLRXIN;
	255	outb_p(b, dev->iobase + 8);
	256
	257	/* register 9 */
	258	b = IRQ \| CONVSRC \| BURSTEN \| INTE;
	259	outb_p(b, dev->iobase + 9);
	260
	261	/* register 10 */
	262	b = TGSEL \| TGEN;
	263	outb_p(b, dev->iobase + 10);
	264
	265	b = 0x07;
	266	outb_p(b, dev->iobase + 8);
	267
	268	das6402_setcounter(dev);
	269
	270	outw_p(SCANL, dev->iobase + 2); /* reset card fifo */
	271
	272	devpriv->das6402_ignoreirq = 0;
	273
	274	return 0;
	275	}
	276
0a85b6f0 MT	277	static int das6402_attach(struct comedi_device *dev,
0a85b6f0 MT	278	struct comedi_devconfig *it)
48f16b6a OS	279	{
	280	unsigned int irq;
	281	unsigned long iobase;
	282	int ret;
34c43922	283	struct comedi_subdevice *s;
48f16b6a OS	284
	285	dev->board_name = "das6402";
	286
	287	iobase = it->options[0];
	288	if (iobase == 0)
	289	iobase = 0x300;
	290
48f16b6a	291	if (!request_region(iobase, DAS6402_SIZE, "das6402")) {
f41ad667	292	dev_err(dev->class_dev, "I/O port conflict\n");
48f16b6a OS	293	return -EIO;
	294	}
	295	dev->iobase = iobase;
	296
	297	/* should do a probe here */
	298
	299	irq = it->options[0];
f41ad667	300	dev_dbg(dev->class_dev, "( irq = %u )\n", irq);
5f74ea14	301	ret = request_irq(irq, intr_handler, 0, "das6402", dev);
7e4198f4	302	if (ret < 0)
48f16b6a	303	return ret;
48f16b6a	304
7e4198f4	305	dev->irq = irq;
c3744138 BP	306	ret = alloc_private(dev, sizeof(struct das6402_private));
c3744138 BP	307	if (ret < 0)
48f16b6a OS	308	return ret;
48f16b6a OS	309
2f0b9d08	310	ret = comedi_alloc_subdevices(dev, 1);
8b6c5694	311	if (ret)
48f16b6a OS	312	return ret;
	313
	314	/* ai subdevice */
92cfef5d	315	s = &dev->subdevices[0];
48f16b6a OS	316	s->type = COMEDI_SUBD_AI;
	317	s->subdev_flags = SDF_READABLE \| SDF_GROUND;
	318	s->n_chan = 8;
2696fb57	319	/* s->trig[2]=das6402_ai_mode2; */
48f16b6a OS	320	s->cancel = das6402_ai_cancel;
	321	s->maxdata = (1 << 12) - 1;
	322	s->len_chanlist = 16; /* ? */
	323	s->range_table = &range_unknown;
	324
	325	board_init(dev);
	326
	327	return 0;
	328	}
90f703d3	329
484ecc95	330	static void das6402_detach(struct comedi_device *dev)
71e7271b HS	331	{
	332	if (dev->irq)
	333	free_irq(dev->irq, dev);
	334	if (dev->iobase)
	335	release_region(dev->iobase, DAS6402_SIZE);
71e7271b HS	336	}
	337
	338	static struct comedi_driver das6402_driver = {
	339	.driver_name = "das6402",
	340	.module = THIS_MODULE,
	341	.attach = das6402_attach,
	342	.detach = das6402_detach,
	343	};
	344	module_comedi_driver(das6402_driver)
	345
90f703d3 AT	346	MODULE_AUTHOR("Comedi http://www.comedi.org");
	347	MODULE_DESCRIPTION("Comedi low-level driver");
	348	MODULE_LICENSE("GPL");