[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 "../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,
};

COMEDI_INITCLEANUP(driver_das6402);

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;
}
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
	41	#include "../comedidev.h"
	42
	43	#include <linux/ioport.h>
	44
	45	#define DAS6402_SIZE 16
	46
	47	#define N_WORDS 3000*64
	48
	49	#define STOP 0
	50	#define START 1
	51
	52	#define SCANL 0x3f00
	53	#define BYTE unsigned char
	54	#define WORD unsigned short
	55
	56	/----- register 8 ----/
	57	#define CLRINT 0x01
	58	#define CLRXTR 0x02
	59	#define CLRXIN 0x04
	60	#define EXTEND 0x10
	61	#define ARMED 0x20 /* enable conting of post sample conv */
	62	#define POSTMODE 0x40
	63	#define MHZ 0x80 /* 10 MHz clock */
	64	/---------------------/
65
66	/----- register 9 ----/
67	#define IRQ (0x04 << 4) /* these two are */
68	#define IRQV 10 /* dependent on each other */
69
70	#define CONVSRC 0x03 /* trig src is Intarnal pacer */
71	#define BURSTEN 0x04 /* enable burst */
72	#define XINTE 0x08 /* use external int. trig */
73	#define INTE 0x80 /* enable analog interrupts */
74	/---------------------/
75
76	/----- register 10 ---/
77	#define TGEN 0x01 /* Use pin DI1 for externl trigging? */
78	#define TGSEL 0x02 /* Use edge triggering */
79	#define TGPOL 0x04 /* active edge is falling */
80	#define PRETRIG 0x08 /* pretrig */
81	/---------------------/
82
83	/----- register 11 ---/
84	#define EOB 0x0c
85	#define FIFOHFULL 0x08
86	#define GAIN 0x01
87	#define FIFONEPTY 0x04
88	#define MODE 0x10
89	#define SEM 0x20
90	#define BIP 0x40
91	/---------------------/
92
93	#define M0 0x00
94	#define M2 0x04
95
96	#define C0 0x00
97	#define C1 0x40
98	#define C2 0x80
99	#define RWLH 0x30
100
da91b269 BP	101	static int das6402_attach(struct comedi_device dev, struct comedi_devconfig it);
da91b269 BP	102	static int das6402_detach(struct comedi_device *dev);
139dfbdf	103	static struct comedi_driver driver_das6402 = {
68c3dbff BP	104	.driver_name = "das6402",
	105	.module = THIS_MODULE,
	106	.attach = das6402_attach,
	107	.detach = das6402_detach,
48f16b6a OS	108	};
	109
	110	COMEDI_INITCLEANUP(driver_das6402);
	111
c7b8bb98	112	struct das6402_private {
48f16b6a OS	113	int ai_bytes_to_read;
	114
	115	int das6402_ignoreirq;
c7b8bb98 BP	116	};
c7b8bb98 BP	117	#define devpriv ((struct das6402_private *)dev->private)
48f16b6a	118
da91b269	119	static void das6402_ai_fifo_dregs(struct comedi_device dev, struct comedi_subdevice s);
48f16b6a	120
da91b269	121	static void das6402_setcounter(struct comedi_device *dev)
48f16b6a OS	122	{
	123	BYTE p;
	124	unsigned short ctrlwrd;
	125
	126	/* set up counter0 first, mode 0 */
	127	p = M0 \| C0 \| RWLH;
	128	outb_p(p, dev->iobase + 15);
	129	ctrlwrd = 2000;
	130	p = (BYTE) (0xff & ctrlwrd);
	131	outb_p(p, dev->iobase + 12);
	132	p = (BYTE) (0xff & (ctrlwrd >> 8));
	133	outb_p(p, dev->iobase + 12);
	134
	135	/* set up counter1, mode 2 */
	136	p = M2 \| C1 \| RWLH;
	137	outb_p(p, dev->iobase + 15);
	138	ctrlwrd = 10;
	139	p = (BYTE) (0xff & ctrlwrd);
	140	outb_p(p, dev->iobase + 13);
	141	p = (BYTE) (0xff & (ctrlwrd >> 8));
	142	outb_p(p, dev->iobase + 13);
	143
	144	/* set up counter1, mode 2 */
	145	p = M2 \| C2 \| RWLH;
	146	outb_p(p, dev->iobase + 15);
	147	ctrlwrd = 1000;
	148	p = (BYTE) (0xff & ctrlwrd);
	149	outb_p(p, dev->iobase + 14);
	150	p = (BYTE) (0xff & (ctrlwrd >> 8));
	151	outb_p(p, dev->iobase + 14);
	152	}
	153
70265d24	154	static irqreturn_t intr_handler(int irq, void *d)
48f16b6a	155	{
71b5f4f1	156	struct comedi_device *dev = d;
34c43922	157	struct comedi_subdevice *s = dev->subdevices;
48f16b6a OS	158
	159	if (!dev->attached \|\| devpriv->das6402_ignoreirq) {
	160	printk("das6402: BUG: spurious interrupt\n");
	161	return IRQ_HANDLED;
	162	}
	163	#ifdef DEBUG
	164	printk("das6402: interrupt! das6402_irqcount=%i\n",
	165	devpriv->das6402_irqcount);
	166	printk("das6402: iobase+2=%i\n", inw_p(dev->iobase + 2));
	167	#endif
	168
	169	das6402_ai_fifo_dregs(dev, s);
	170
	171	if (s->async->buf_write_count >= devpriv->ai_bytes_to_read) {
	172	outw_p(SCANL, dev->iobase + 2); /* clears the fifo */
	173	outb(0x07, dev->iobase + 8); /* clears all flip-flops */
	174	#ifdef DEBUG
	175	printk("das6402: Got %i samples\n\n",
	176	devpriv->das6402_wordsread - diff);
	177	#endif
	178	s->async->events \|= COMEDI_CB_EOA;
	179	comedi_event(dev, s);
	180	}
	181
	182	outb(0x01, dev->iobase + 8); /* clear only the interrupt flip-flop */
	183
	184	comedi_event(dev, s);
	185	return IRQ_HANDLED;
	186	}
	187
	188	#if 0
da91b269	189	static void das6402_ai_fifo_read(struct comedi_device dev, short data, int n)
48f16b6a OS	190	{
	191	int i;
	192
	193	for (i = 0; i < n; i++)
	194	data[i] = inw(dev->iobase);
	195	}
	196	#endif
	197
da91b269	198	static void das6402_ai_fifo_dregs(struct comedi_device dev, struct comedi_subdevice s)
48f16b6a OS	199	{
	200	while (1) {
	201	if (!(inb(dev->iobase + 8) & 0x01))
	202	return;
	203	comedi_buf_put(s->async, inw(dev->iobase));
	204	}
	205	}
	206
da91b269	207	static int das6402_ai_cancel(struct comedi_device dev, struct comedi_subdevice s)
48f16b6a OS	208	{
	209	/*
	210	* This function should reset the board from whatever condition it
	211	* is in (i.e., acquiring data), to a non-active state.
	212	*/
	213
	214	devpriv->das6402_ignoreirq = 1;
	215	#ifdef DEBUG
	216	printk("das6402: Stopping acquisition\n");
	217	#endif
	218	devpriv->das6402_ignoreirq = 1;
	219	outb_p(0x02, dev->iobase + 10); /* disable external trigging */
	220	outw_p(SCANL, dev->iobase + 2); /* resets the card fifo */
	221	outb_p(0, dev->iobase + 9); /* disables interrupts */
	222
	223	outw_p(SCANL, dev->iobase + 2);
	224
	225	return 0;
	226	}
	227
	228	#ifdef unused
da91b269 BP	229	static int das6402_ai_mode2(struct comedi_device dev, struct comedi_subdevice s,
da91b269 BP	230	comedi_trig *it)
48f16b6a OS	231	{
	232	devpriv->das6402_ignoreirq = 1;
	233
	234	#ifdef DEBUG
	235	printk("das6402: Starting acquisition\n");
	236	#endif
	237	outb_p(0x03, dev->iobase + 10); /* enable external trigging */
	238	outw_p(SCANL, dev->iobase + 2); /* resets the card fifo */
	239	outb_p(IRQ \| CONVSRC \| BURSTEN \| INTE, dev->iobase + 9);
	240
790c5541	241	devpriv->ai_bytes_to_read = it->n * sizeof(short);
48f16b6a OS	242
	243	/* um... ignoreirq is a nasty race condition */
	244	devpriv->das6402_ignoreirq = 0;
	245
	246	outw_p(SCANL, dev->iobase + 2);
	247
	248	return 0;
	249	}
	250	#endif
	251
da91b269	252	static int board_init(struct comedi_device *dev)
48f16b6a OS	253	{
	254	BYTE b;
	255
	256	devpriv->das6402_ignoreirq = 1;
	257
	258	outb(0x07, dev->iobase + 8);
	259
	260	/* register 11 */
	261	outb_p(MODE, dev->iobase + 11);
	262	b = BIP \| SEM \| MODE \| GAIN \| FIFOHFULL;
	263	outb_p(b, dev->iobase + 11);
	264
	265	/* register 8 */
	266	outb_p(EXTEND, dev->iobase + 8);
	267	b = EXTEND \| MHZ;
	268	outb_p(b, dev->iobase + 8);
	269	b = MHZ \| CLRINT \| CLRXTR \| CLRXIN;
	270	outb_p(b, dev->iobase + 8);
	271
	272	/* register 9 */
	273	b = IRQ \| CONVSRC \| BURSTEN \| INTE;
	274	outb_p(b, dev->iobase + 9);
	275
	276	/* register 10 */
	277	b = TGSEL \| TGEN;
	278	outb_p(b, dev->iobase + 10);
	279
	280	b = 0x07;
	281	outb_p(b, dev->iobase + 8);
	282
	283	das6402_setcounter(dev);
	284
	285	outw_p(SCANL, dev->iobase + 2); /* reset card fifo */
	286
	287	devpriv->das6402_ignoreirq = 0;
	288
	289	return 0;
	290	}
	291
da91b269	292	static int das6402_detach(struct comedi_device *dev)
48f16b6a OS	293	{
48f16b6a OS	294	if (dev->irq)
5f74ea14	295	free_irq(dev->irq, dev);
48f16b6a OS	296	if (dev->iobase)
	297	release_region(dev->iobase, DAS6402_SIZE);
	298
	299	return 0;
	300	}
	301
da91b269	302	static int das6402_attach(struct comedi_device dev, struct comedi_devconfig it)
48f16b6a OS	303	{
	304	unsigned int irq;
	305	unsigned long iobase;
	306	int ret;
34c43922	307	struct comedi_subdevice *s;
48f16b6a OS	308
	309	dev->board_name = "das6402";
	310
	311	iobase = it->options[0];
	312	if (iobase == 0)
	313	iobase = 0x300;
	314
	315	printk("comedi%d: das6402: 0x%04lx", dev->minor, iobase);
	316
	317	if (!request_region(iobase, DAS6402_SIZE, "das6402")) {
	318	printk(" I/O port conflict\n");
	319	return -EIO;
	320	}
	321	dev->iobase = iobase;
	322
	323	/* should do a probe here */
	324
	325	irq = it->options[0];
	326	printk(" ( irq = %u )", irq);
5f74ea14	327	ret = request_irq(irq, intr_handler, 0, "das6402", dev);
48f16b6a OS	328	if (ret < 0) {
	329	printk("irq conflict\n");
	330	return ret;
	331	}
	332	dev->irq = irq;
	333
c3744138 BP	334	ret = alloc_private(dev, sizeof(struct das6402_private));
c3744138 BP	335	if (ret < 0)
48f16b6a OS	336	return ret;
48f16b6a OS	337
c3744138 BP	338	ret = alloc_subdevices(dev, 1);
c3744138 BP	339	if (ret < 0)
48f16b6a OS	340	return ret;
	341
	342	/* ai subdevice */
	343	s = dev->subdevices + 0;
	344	s->type = COMEDI_SUBD_AI;
	345	s->subdev_flags = SDF_READABLE \| SDF_GROUND;
	346	s->n_chan = 8;
2696fb57	347	/* s->trig[2]=das6402_ai_mode2; */
48f16b6a OS	348	s->cancel = das6402_ai_cancel;
	349	s->maxdata = (1 << 12) - 1;
	350	s->len_chanlist = 16; /* ? */
	351	s->range_table = &range_unknown;
	352
	353	board_init(dev);
	354
	355	return 0;
	356	}