das16m1.c revision 7114a28011f9d5f3d981731ad341177c21f9d948 
1/*
2    comedi/drivers/das16m1.c
3    CIO-DAS16/M1 driver
4    Author: Frank Mori Hess, based on code from the das16
5      driver.
6    Copyright (C) 2001 Frank Mori Hess <fmhess@users.sourceforge.net>
7
8    COMEDI - Linux Control and Measurement Device Interface
9    Copyright (C) 2000 David A. Schleef <ds@schleef.org>
10
11    This program is free software; you can redistribute it and/or modify
12    it under the terms of the GNU General Public License as published by
13    the Free Software Foundation; either version 2 of the License, or
14    (at your option) any later version.
15
16    This program is distributed in the hope that it will be useful,
17    but WITHOUT ANY WARRANTY; without even the implied warranty of
18    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
19    GNU General Public License for more details.
20
21    You should have received a copy of the GNU General Public License
22    along with this program; if not, write to the Free Software
23    Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
24
25************************************************************************
26*/
27/*
28Driver: das16m1
29Description: CIO-DAS16/M1
30Author: Frank Mori Hess <fmhess@users.sourceforge.net>
31Devices: [Measurement Computing] CIO-DAS16/M1 (cio-das16/m1)
32Status: works
33
34This driver supports a single board - the CIO-DAS16/M1.
35As far as I know, there are no other boards that have
36the same register layout.  Even the CIO-DAS16/M1/16 is
37significantly different.
38
39I was _barely_ able to reach the full 1 MHz capability
40of this board, using a hard real-time interrupt
41(set the TRIG_RT flag in your struct comedi_cmd and use
42rtlinux or RTAI).  The board can't do dma, so the bottleneck is
43pulling the data across the ISA bus.  I timed the interrupt
44handler, and it took my computer ~470 microseconds to pull 512
45samples from the board.  So at 1 Mhz sampling rate,
46expect your CPU to be spending almost all of its
47time in the interrupt handler.
48
49This board has some unusual restrictions for its channel/gain list.  If the
50list has 2 or more channels in it, then two conditions must be satisfied:
51(1) - even/odd channels must appear at even/odd indices in the list
52(2) - the list must have an even number of entries.
53
54Options:
55        [0] - base io address
56        [1] - irq (optional, but you probably want it)
57
58irq can be omitted, although the cmd interface will not work without it.
59*/
60
61#include <linux/ioport.h>
62#include <linux/interrupt.h>
63#include "../comedidev.h"
64
65#include "8255.h"
66#include "8253.h"
67#include "comedi_fc.h"
68
69#define DAS16M1_SIZE 16
70#define DAS16M1_SIZE2 8
71
72#define DAS16M1_XTAL 100	/* 10 MHz master clock */
73
74#define FIFO_SIZE 1024		/*  1024 sample fifo */
75
76/*
77    CIO-DAS16_M1.pdf
78
79    "cio-das16/m1"
80
81  0	a/d bits 0-3, mux		start 12 bit
82  1	a/d bits 4-11		unused
83  2	status		control
84  3	di 4 bit		do 4 bit
85  4	unused			clear interrupt
86  5	interrupt, pacer
87  6	channel/gain queue address
88  7	channel/gain queue data
89  89ab	8254
90  cdef	8254
91  400	8255
92  404-407 	8254
93
94*/
95
96#define DAS16M1_AI             0	/*  16-bit wide register */
97#define   AI_CHAN(x)             ((x) & 0xf)
98#define DAS16M1_CS             2
99#define   EXT_TRIG_BIT           0x1
100#define   OVRUN                  0x20
101#define   IRQDATA                0x80
102#define DAS16M1_DIO            3
103#define DAS16M1_CLEAR_INTR     4
104#define DAS16M1_INTR_CONTROL   5
105#define   EXT_PACER              0x2
106#define   INT_PACER              0x3
107#define   PACER_MASK             0x3
108#define   INTE                   0x80
109#define DAS16M1_QUEUE_ADDR     6
110#define DAS16M1_QUEUE_DATA     7
111#define   Q_CHAN(x)              ((x) & 0x7)
112#define   Q_RANGE(x)             (((x) & 0xf) << 4)
113#define   UNIPOLAR               0x40
114#define DAS16M1_8254_FIRST             0x8
115#define DAS16M1_8254_FIRST_CNTRL       0xb
116#define   TOTAL_CLEAR                    0x30
117#define DAS16M1_8254_SECOND            0xc
118#define DAS16M1_82C55                  0x400
119#define DAS16M1_8254_THIRD             0x404
120
121static const struct comedi_lrange range_das16m1 = { 9,
122	{
123	 BIP_RANGE(5),
124	 BIP_RANGE(2.5),
125	 BIP_RANGE(1.25),
126	 BIP_RANGE(0.625),
127	 UNI_RANGE(10),
128	 UNI_RANGE(5),
129	 UNI_RANGE(2.5),
130	 UNI_RANGE(1.25),
131	 BIP_RANGE(10),
132	 }
133};
134
135static int das16m1_do_wbits(struct comedi_device *dev,
136			    struct comedi_subdevice *s,
137			    struct comedi_insn *insn, unsigned int *data);
138static int das16m1_di_rbits(struct comedi_device *dev,
139			    struct comedi_subdevice *s,
140			    struct comedi_insn *insn, unsigned int *data);
141static int das16m1_ai_rinsn(struct comedi_device *dev,
142			    struct comedi_subdevice *s,
143			    struct comedi_insn *insn, unsigned int *data);
144
145static int das16m1_cmd_test(struct comedi_device *dev,
146			    struct comedi_subdevice *s, struct comedi_cmd *cmd);
147static int das16m1_cmd_exec(struct comedi_device *dev,
148			    struct comedi_subdevice *s);
149static int das16m1_cancel(struct comedi_device *dev,
150			  struct comedi_subdevice *s);
151
152static int das16m1_poll(struct comedi_device *dev, struct comedi_subdevice *s);
153static irqreturn_t das16m1_interrupt(int irq, void *d);
154static void das16m1_handler(struct comedi_device *dev, unsigned int status);
155
156static unsigned int das16m1_set_pacer(struct comedi_device *dev,
157				      unsigned int ns, int round_flag);
158
159static int das16m1_irq_bits(unsigned int irq);
160
161struct das16m1_board {
162	const char *name;
163	unsigned int ai_speed;
164};
165
166static const struct das16m1_board das16m1_boards[] = {
167	{
168	 .name = "cio-das16/m1",	/*  CIO-DAS16_M1.pdf */
169	 .ai_speed = 1000,	/*  1MHz max speed */
170	 },
171};
172
173static int das16m1_attach(struct comedi_device *dev,
174			  struct comedi_devconfig *it);
175static int das16m1_detach(struct comedi_device *dev);
176static struct comedi_driver driver_das16m1 = {
177	.driver_name = "das16m1",
178	.module = THIS_MODULE,
179	.attach = das16m1_attach,
180	.detach = das16m1_detach,
181	.board_name = &das16m1_boards[0].name,
182	.num_names = ARRAY_SIZE(das16m1_boards),
183	.offset = sizeof(das16m1_boards[0]),
184};
185
186struct das16m1_private_struct {
187	unsigned int control_state;
188	volatile unsigned int adc_count;	/*  number of samples completed */
189	/* initial value in lower half of hardware conversion counter,
190	 * needed to keep track of whether new count has been loaded into
191	 * counter yet (loaded by first sample conversion) */
192	u16 initial_hw_count;
193	short ai_buffer[FIFO_SIZE];
194	unsigned int do_bits;	/*  saves status of digital output bits */
195	unsigned int divisor1;	/*  divides master clock to obtain conversion speed */
196	unsigned int divisor2;	/*  divides master clock to obtain conversion speed */
197};
198#define devpriv ((struct das16m1_private_struct *)(dev->private))
199#define thisboard ((const struct das16m1_board *)(dev->board_ptr))
200
201static int __init driver_das16m1_init_module(void)
202{
203	return comedi_driver_register(&driver_das16m1);
204}
205
206static void __exit driver_das16m1_cleanup_module(void)
207{
208	comedi_driver_unregister(&driver_das16m1);
209}
210
211module_init(driver_das16m1_init_module);
212module_exit(driver_das16m1_cleanup_module);
213
214static inline short munge_sample(short data)
215{
216	return (data >> 4) & 0xfff;
217}
218
219static int das16m1_cmd_test(struct comedi_device *dev,
220			    struct comedi_subdevice *s, struct comedi_cmd *cmd)
221{
222	unsigned int err = 0, tmp, i;
223
224	/* make sure triggers are valid */
225	tmp = cmd->start_src;
226	cmd->start_src &= TRIG_NOW | TRIG_EXT;
227	if (!cmd->start_src || tmp != cmd->start_src)
228		err++;
229
230	tmp = cmd->scan_begin_src;
231	cmd->scan_begin_src &= TRIG_FOLLOW;
232	if (!cmd->scan_begin_src || tmp != cmd->scan_begin_src)
233		err++;
234
235	tmp = cmd->convert_src;
236	cmd->convert_src &= TRIG_TIMER | TRIG_EXT;
237	if (!cmd->convert_src || tmp != cmd->convert_src)
238		err++;
239
240	tmp = cmd->scan_end_src;
241	cmd->scan_end_src &= TRIG_COUNT;
242	if (!cmd->scan_end_src || tmp != cmd->scan_end_src)
243		err++;
244
245	tmp = cmd->stop_src;
246	cmd->stop_src &= TRIG_COUNT | TRIG_NONE;
247	if (!cmd->stop_src || tmp != cmd->stop_src)
248		err++;
249
250	if (err)
251		return 1;
252
253	/* step 2: make sure trigger sources are unique and mutually compatible */
254	if (cmd->stop_src != TRIG_COUNT && cmd->stop_src != TRIG_NONE)
255		err++;
256	if (cmd->start_src != TRIG_NOW && cmd->start_src != TRIG_EXT)
257		err++;
258	if (cmd->convert_src != TRIG_TIMER && cmd->convert_src != TRIG_EXT)
259		err++;
260
261	if (err)
262		return 2;
263
264	/* step 3: make sure arguments are trivially compatible */
265	if (cmd->start_arg != 0) {
266		cmd->start_arg = 0;
267		err++;
268	}
269
270	if (cmd->scan_begin_src == TRIG_FOLLOW) {
271		/* internal trigger */
272		if (cmd->scan_begin_arg != 0) {
273			cmd->scan_begin_arg = 0;
274			err++;
275		}
276	}
277
278	if (cmd->convert_src == TRIG_TIMER) {
279		if (cmd->convert_arg < thisboard->ai_speed) {
280			cmd->convert_arg = thisboard->ai_speed;
281			err++;
282		}
283	}
284
285	if (cmd->scan_end_arg != cmd->chanlist_len) {
286		cmd->scan_end_arg = cmd->chanlist_len;
287		err++;
288	}
289
290	if (cmd->stop_src == TRIG_COUNT) {
291		/* any count is allowed */
292	} else {
293		/* TRIG_NONE */
294		if (cmd->stop_arg != 0) {
295			cmd->stop_arg = 0;
296			err++;
297		}
298	}
299
300	if (err)
301		return 3;
302
303	/* step 4: fix up arguments */
304
305	if (cmd->convert_src == TRIG_TIMER) {
306		tmp = cmd->convert_arg;
307		/* calculate counter values that give desired timing */
308		i8253_cascade_ns_to_timer_2div(DAS16M1_XTAL,
309					       &(devpriv->divisor1),
310					       &(devpriv->divisor2),
311					       &(cmd->convert_arg),
312					       cmd->flags & TRIG_ROUND_MASK);
313		if (tmp != cmd->convert_arg)
314			err++;
315	}
316
317	if (err)
318		return 4;
319
320	/*  check chanlist against board's peculiarities */
321	if (cmd->chanlist && cmd->chanlist_len > 1) {
322		for (i = 0; i < cmd->chanlist_len; i++) {
323			/*  even/odd channels must go into even/odd queue addresses */
324			if ((i % 2) != (CR_CHAN(cmd->chanlist[i]) % 2)) {
325				comedi_error(dev, "bad chanlist:\n"
326					     " even/odd channels must go have even/odd chanlist indices");
327				err++;
328			}
329		}
330		if ((cmd->chanlist_len % 2) != 0) {
331			comedi_error(dev,
332				     "chanlist must be of even length or length 1");
333			err++;
334		}
335	}
336
337	if (err)
338		return 5;
339
340	return 0;
341}
342
343static int das16m1_cmd_exec(struct comedi_device *dev,
344			    struct comedi_subdevice *s)
345{
346	struct comedi_async *async = s->async;
347	struct comedi_cmd *cmd = &async->cmd;
348	unsigned int byte, i;
349
350	if (dev->irq == 0) {
351		comedi_error(dev, "irq required to execute comedi_cmd");
352		return -1;
353	}
354
355	/* disable interrupts and internal pacer */
356	devpriv->control_state &= ~INTE & ~PACER_MASK;
357	outb(devpriv->control_state, dev->iobase + DAS16M1_INTR_CONTROL);
358
359	/*  set software count */
360	devpriv->adc_count = 0;
361	/* Initialize lower half of hardware counter, used to determine how
362	 * many samples are in fifo.  Value doesn't actually load into counter
363	 * until counter's next clock (the next a/d conversion) */
364	i8254_load(dev->iobase + DAS16M1_8254_FIRST, 0, 1, 0, 2);
365	/* remember current reading of counter so we know when counter has
366	 * actually been loaded */
367	devpriv->initial_hw_count =
368	    i8254_read(dev->iobase + DAS16M1_8254_FIRST, 0, 1);
369	/* setup channel/gain queue */
370	for (i = 0; i < cmd->chanlist_len; i++) {
371		outb(i, dev->iobase + DAS16M1_QUEUE_ADDR);
372		byte =
373		    Q_CHAN(CR_CHAN(cmd->chanlist[i])) |
374		    Q_RANGE(CR_RANGE(cmd->chanlist[i]));
375		outb(byte, dev->iobase + DAS16M1_QUEUE_DATA);
376	}
377
378	/* set counter mode and counts */
379	cmd->convert_arg =
380	    das16m1_set_pacer(dev, cmd->convert_arg,
381			      cmd->flags & TRIG_ROUND_MASK);
382
383	/*  set control & status register */
384	byte = 0;
385	/* if we are using external start trigger (also board dislikes having
386	 * both start and conversion triggers external simultaneously) */
387	if (cmd->start_src == TRIG_EXT && cmd->convert_src != TRIG_EXT) {
388		byte |= EXT_TRIG_BIT;
389	}
390	outb(byte, dev->iobase + DAS16M1_CS);
391	/* clear interrupt bit */
392	outb(0, dev->iobase + DAS16M1_CLEAR_INTR);
393
394	/* enable interrupts and internal pacer */
395	devpriv->control_state &= ~PACER_MASK;
396	if (cmd->convert_src == TRIG_TIMER) {
397		devpriv->control_state |= INT_PACER;
398	} else {
399		devpriv->control_state |= EXT_PACER;
400	}
401	devpriv->control_state |= INTE;
402	outb(devpriv->control_state, dev->iobase + DAS16M1_INTR_CONTROL);
403
404	return 0;
405}
406
407static int das16m1_cancel(struct comedi_device *dev, struct comedi_subdevice *s)
408{
409	devpriv->control_state &= ~INTE & ~PACER_MASK;
410	outb(devpriv->control_state, dev->iobase + DAS16M1_INTR_CONTROL);
411
412	return 0;
413}
414
415static int das16m1_ai_rinsn(struct comedi_device *dev,
416			    struct comedi_subdevice *s,
417			    struct comedi_insn *insn, unsigned int *data)
418{
419	int i, n;
420	int byte;
421	const int timeout = 1000;
422
423	/* disable interrupts and internal pacer */
424	devpriv->control_state &= ~INTE & ~PACER_MASK;
425	outb(devpriv->control_state, dev->iobase + DAS16M1_INTR_CONTROL);
426
427	/* setup channel/gain queue */
428	outb(0, dev->iobase + DAS16M1_QUEUE_ADDR);
429	byte =
430	    Q_CHAN(CR_CHAN(insn->chanspec)) | Q_RANGE(CR_RANGE(insn->chanspec));
431	outb(byte, dev->iobase + DAS16M1_QUEUE_DATA);
432
433	for (n = 0; n < insn->n; n++) {
434		/* clear IRQDATA bit */
435		outb(0, dev->iobase + DAS16M1_CLEAR_INTR);
436		/* trigger conversion */
437		outb(0, dev->iobase);
438
439		for (i = 0; i < timeout; i++) {
440			if (inb(dev->iobase + DAS16M1_CS) & IRQDATA)
441				break;
442		}
443		if (i == timeout) {
444			comedi_error(dev, "timeout");
445			return -ETIME;
446		}
447		data[n] = munge_sample(inw(dev->iobase));
448	}
449
450	return n;
451}
452
453static int das16m1_di_rbits(struct comedi_device *dev,
454			    struct comedi_subdevice *s,
455			    struct comedi_insn *insn, unsigned int *data)
456{
457	unsigned int bits;
458
459	bits = inb(dev->iobase + DAS16M1_DIO) & 0xf;
460	data[1] = bits;
461	data[0] = 0;
462
463	return 2;
464}
465
466static int das16m1_do_wbits(struct comedi_device *dev,
467			    struct comedi_subdevice *s,
468			    struct comedi_insn *insn, unsigned int *data)
469{
470	unsigned int wbits;
471
472	/*  only set bits that have been masked */
473	data[0] &= 0xf;
474	wbits = devpriv->do_bits;
475	/*  zero bits that have been masked */
476	wbits &= ~data[0];
477	/*  set masked bits */
478	wbits |= data[0] & data[1];
479	devpriv->do_bits = wbits;
480	data[1] = wbits;
481
482	outb(devpriv->do_bits, dev->iobase + DAS16M1_DIO);
483
484	return 2;
485}
486
487static int das16m1_poll(struct comedi_device *dev, struct comedi_subdevice *s)
488{
489	unsigned long flags;
490	unsigned int status;
491
492	/*  prevent race with interrupt handler */
493	spin_lock_irqsave(&dev->spinlock, flags);
494	status = inb(dev->iobase + DAS16M1_CS);
495	das16m1_handler(dev, status);
496	spin_unlock_irqrestore(&dev->spinlock, flags);
497
498	return s->async->buf_write_count - s->async->buf_read_count;
499}
500
501static irqreturn_t das16m1_interrupt(int irq, void *d)
502{
503	int status;
504	struct comedi_device *dev = d;
505
506	if (dev->attached == 0) {
507		comedi_error(dev, "premature interrupt");
508		return IRQ_HANDLED;
509	}
510	/*  prevent race with comedi_poll() */
511	spin_lock(&dev->spinlock);
512
513	status = inb(dev->iobase + DAS16M1_CS);
514
515	if ((status & (IRQDATA | OVRUN)) == 0) {
516		comedi_error(dev, "spurious interrupt");
517		spin_unlock(&dev->spinlock);
518		return IRQ_NONE;
519	}
520
521	das16m1_handler(dev, status);
522
523	/* clear interrupt */
524	outb(0, dev->iobase + DAS16M1_CLEAR_INTR);
525
526	spin_unlock(&dev->spinlock);
527	return IRQ_HANDLED;
528}
529
530static void munge_sample_array(short *array, unsigned int num_elements)
531{
532	unsigned int i;
533
534	for (i = 0; i < num_elements; i++) {
535		array[i] = munge_sample(array[i]);
536	}
537}
538
539static void das16m1_handler(struct comedi_device *dev, unsigned int status)
540{
541	struct comedi_subdevice *s;
542	struct comedi_async *async;
543	struct comedi_cmd *cmd;
544	u16 num_samples;
545	u16 hw_counter;
546
547	s = dev->read_subdev;
548	async = s->async;
549	async->events = 0;
550	cmd = &async->cmd;
551
552	/*  figure out how many samples are in fifo */
553	hw_counter = i8254_read(dev->iobase + DAS16M1_8254_FIRST, 0, 1);
554	/* make sure hardware counter reading is not bogus due to initial value
555	 * not having been loaded yet */
556	if (devpriv->adc_count == 0 && hw_counter == devpriv->initial_hw_count) {
557		num_samples = 0;
558	} else {
559		/* The calculation of num_samples looks odd, but it uses the following facts.
560		 * 16 bit hardware counter is initialized with value of zero (which really
561		 * means 0x1000).  The counter decrements by one on each conversion
562		 * (when the counter decrements from zero it goes to 0xffff).  num_samples
563		 * is a 16 bit variable, so it will roll over in a similar fashion to the
564		 * hardware counter.  Work it out, and this is what you get. */
565		num_samples = -hw_counter - devpriv->adc_count;
566	}
567	/*  check if we only need some of the points */
568	if (cmd->stop_src == TRIG_COUNT) {
569		if (num_samples > cmd->stop_arg * cmd->chanlist_len)
570			num_samples = cmd->stop_arg * cmd->chanlist_len;
571	}
572	/*  make sure we dont try to get too many points if fifo has overrun */
573	if (num_samples > FIFO_SIZE)
574		num_samples = FIFO_SIZE;
575	insw(dev->iobase, devpriv->ai_buffer, num_samples);
576	munge_sample_array(devpriv->ai_buffer, num_samples);
577	cfc_write_array_to_buffer(s, devpriv->ai_buffer,
578				  num_samples * sizeof(short));
579	devpriv->adc_count += num_samples;
580
581	if (cmd->stop_src == TRIG_COUNT) {
582		if (devpriv->adc_count >= cmd->stop_arg * cmd->chanlist_len) {	/* end of acquisition */
583			das16m1_cancel(dev, s);
584			async->events |= COMEDI_CB_EOA;
585		}
586	}
587
588	/* this probably won't catch overruns since the card doesn't generate
589	 * overrun interrupts, but we might as well try */
590	if (status & OVRUN) {
591		das16m1_cancel(dev, s);
592		async->events |= COMEDI_CB_EOA | COMEDI_CB_ERROR;
593		comedi_error(dev, "fifo overflow");
594	}
595
596	comedi_event(dev, s);
597
598}
599
600/* This function takes a time in nanoseconds and sets the     *
601 * 2 pacer clocks to the closest frequency possible. It also  *
602 * returns the actual sampling period.                        */
603static unsigned int das16m1_set_pacer(struct comedi_device *dev,
604				      unsigned int ns, int rounding_flags)
605{
606	i8253_cascade_ns_to_timer_2div(DAS16M1_XTAL, &(devpriv->divisor1),
607				       &(devpriv->divisor2), &ns,
608				       rounding_flags & TRIG_ROUND_MASK);
609
610	/* Write the values of ctr1 and ctr2 into counters 1 and 2 */
611	i8254_load(dev->iobase + DAS16M1_8254_SECOND, 0, 1, devpriv->divisor1,
612		   2);
613	i8254_load(dev->iobase + DAS16M1_8254_SECOND, 0, 2, devpriv->divisor2,
614		   2);
615
616	return ns;
617}
618
619static int das16m1_irq_bits(unsigned int irq)
620{
621	int ret;
622
623	switch (irq) {
624	case 10:
625		ret = 0x0;
626		break;
627	case 11:
628		ret = 0x1;
629		break;
630	case 12:
631		ret = 0x2;
632		break;
633	case 15:
634		ret = 0x3;
635		break;
636	case 2:
637		ret = 0x4;
638		break;
639	case 3:
640		ret = 0x5;
641		break;
642	case 5:
643		ret = 0x6;
644		break;
645	case 7:
646		ret = 0x7;
647		break;
648	default:
649		return -1;
650		break;
651	}
652	return ret << 4;
653}
654
655/*
656 * Options list:
657 *   0  I/O base
658 *   1  IRQ
659 */
660
661static int das16m1_attach(struct comedi_device *dev,
662			  struct comedi_devconfig *it)
663{
664	struct comedi_subdevice *s;
665	int ret;
666	unsigned int irq;
667	unsigned long iobase;
668
669	iobase = it->options[0];
670
671	printk("comedi%d: das16m1:", dev->minor);
672
673	ret = alloc_private(dev, sizeof(struct das16m1_private_struct));
674	if (ret < 0)
675		return ret;
676
677	dev->board_name = thisboard->name;
678
679	printk(" io 0x%lx-0x%lx 0x%lx-0x%lx",
680	       iobase, iobase + DAS16M1_SIZE,
681	       iobase + DAS16M1_82C55, iobase + DAS16M1_82C55 + DAS16M1_SIZE2);
682	if (!request_region(iobase, DAS16M1_SIZE, driver_das16m1.driver_name)) {
683		printk(" I/O port conflict\n");
684		return -EIO;
685	}
686	if (!request_region(iobase + DAS16M1_82C55, DAS16M1_SIZE2,
687			    driver_das16m1.driver_name)) {
688		release_region(iobase, DAS16M1_SIZE);
689		printk(" I/O port conflict\n");
690		return -EIO;
691	}
692	dev->iobase = iobase;
693
694	/* now for the irq */
695	irq = it->options[1];
696	/*  make sure it is valid */
697	if (das16m1_irq_bits(irq) >= 0) {
698		ret = request_irq(irq, das16m1_interrupt, 0,
699				  driver_das16m1.driver_name, dev);
700		if (ret < 0) {
701			printk(", irq unavailable\n");
702			return ret;
703		}
704		dev->irq = irq;
705		printk(", irq %u\n", irq);
706	} else if (irq == 0) {
707		printk(", no irq\n");
708	} else {
709		printk(", invalid irq\n"
710		       " valid irqs are 2, 3, 5, 7, 10, 11, 12, or 15\n");
711		return -EINVAL;
712	}
713
714	ret = alloc_subdevices(dev, 4);
715	if (ret < 0)
716		return ret;
717
718	s = dev->subdevices + 0;
719	dev->read_subdev = s;
720	/* ai */
721	s->type = COMEDI_SUBD_AI;
722	s->subdev_flags = SDF_READABLE | SDF_CMD_READ;
723	s->n_chan = 8;
724	s->subdev_flags = SDF_DIFF;
725	s->len_chanlist = 256;
726	s->maxdata = (1 << 12) - 1;
727	s->range_table = &range_das16m1;
728	s->insn_read = das16m1_ai_rinsn;
729	s->do_cmdtest = das16m1_cmd_test;
730	s->do_cmd = das16m1_cmd_exec;
731	s->cancel = das16m1_cancel;
732	s->poll = das16m1_poll;
733
734	s = dev->subdevices + 1;
735	/* di */
736	s->type = COMEDI_SUBD_DI;
737	s->subdev_flags = SDF_READABLE;
738	s->n_chan = 4;
739	s->maxdata = 1;
740	s->range_table = &range_digital;
741	s->insn_bits = das16m1_di_rbits;
742
743	s = dev->subdevices + 2;
744	/* do */
745	s->type = COMEDI_SUBD_DO;
746	s->subdev_flags = SDF_WRITABLE | SDF_READABLE;
747	s->n_chan = 4;
748	s->maxdata = 1;
749	s->range_table = &range_digital;
750	s->insn_bits = das16m1_do_wbits;
751
752	s = dev->subdevices + 3;
753	/* 8255 */
754	subdev_8255_init(dev, s, NULL, dev->iobase + DAS16M1_82C55);
755
756	/*  disable upper half of hardware conversion counter so it doesn't mess with us */
757	outb(TOTAL_CLEAR, dev->iobase + DAS16M1_8254_FIRST_CNTRL);
758
759	/*  initialize digital output lines */
760	outb(devpriv->do_bits, dev->iobase + DAS16M1_DIO);
761
762	/* set the interrupt level */
763	if (dev->irq)
764		devpriv->control_state = das16m1_irq_bits(dev->irq);
765	else
766		devpriv->control_state = 0;
767	outb(devpriv->control_state, dev->iobase + DAS16M1_INTR_CONTROL);
768
769	return 0;
770}
771
772static int das16m1_detach(struct comedi_device *dev)
773{
774	printk("comedi%d: das16m1: remove\n", dev->minor);
775
776/* das16m1_reset(dev); */
777
778	if (dev->subdevices)
779		subdev_8255_cleanup(dev, dev->subdevices + 3);
780
781	if (dev->irq)
782		free_irq(dev->irq, dev);
783
784	if (dev->iobase) {
785		release_region(dev->iobase, DAS16M1_SIZE);
786		release_region(dev->iobase + DAS16M1_82C55, DAS16M1_SIZE2);
787	}
788
789	return 0;
790}
791
792MODULE_AUTHOR("Comedi http://www.comedi.org");
793MODULE_DESCRIPTION("Comedi low-level driver");
794MODULE_LICENSE("GPL");
795