Free Electrons

Embedded Linux Experts

  1
  2
  3
  4
  5
  6
  7
  8
  9
 10
 11
 12
 13
 14
 15
 16
 17
 18
 19
 20
 21
 22
 23
 24
 25
 26
 27
 28
 29
 30
 31
 32
 33
 34
 35
 36
 37
 38
 39
 40
 41
 42
 43
 44
 45
 46
 47
 48
 49
 50
 51
 52
 53
 54
 55
 56
 57
 58
 59
 60
 61
 62
 63
 64
 65
 66
 67
 68
 69
 70
 71
 72
 73
 74
 75
 76
 77
 78
 79
 80
 81
 82
 83
 84
 85
 86
 87
 88
 89
 90
 91
 92
 93
 94
 95
 96
 97
 98
 99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
207
208
209
210
211
212
213
214
215
216
217
218
219
220
221
222
223
224
225
226
227
228
229
230
231
232
233
234
235
236
237
238
239
240
241
242
243
244
245
246
247
248
249
250
251
252
253
254
255
256
257
258
259
260
261
262
263
264
265
266
267
268
269
270
271
272
273
274
275
276
277
278
279
280
281
282
283
284
285
286
287
288
289
290
291
292
293
294
295
296
297
298
299
300
301
302
303
304
305
306
307
308
309
310
311
312
313
314
315
316
317
318
319
320
321
322
323
324
325
326
327
328
329
330
331
332
333
334
335
336
337
338
339
340
341
342
343
344
345
346
347
348
349
350
351
352
353
354
355
356
357
358
359
360
361
362
363
364
365
366
367
368
369
370
371
372
373
374
375
376
377
378
379
380
381
382
383
384
385
386
387
388
389
390
391
392
393
394
395
396
397
398
399
400
401
402
403
404
405
406
407
408
409
410
411
412
413
414
415
416
417
418
419
420
421
422
423
424
425
426
427
428
429
430
431
432
433
434
435
436
437
438
439
440
441
442
443
444
445
446
447
448
449
450
451
452
453
454
455
456
457
458
459
460
461
462
463
464
465
466
467
468
469
470
471
472
473
474
475
476
477
478
479
480
481
482
483
484
485
486
487
488
489
490
491
492
493
494
495
496
497
498
499
500
501
502
503
504
505
506
507
508
509
510
511
512
513
514
515
516
517
518
519
520
521
522
523
524
525
526
527
528
529
530
531
532
533
534
535
536
537
538
539
540
541
542
543
544
545
546
547
548
549
550
551
552
553
554
555
556
557
558
559
560
561
562
563
564
565
566
567
568
569
570
571
572
573
574
575
576
577
578
579
580
581
582
583
584
585
586
587
588
589
590
591
592
593
594
595
596
597
598
599
600
601
602
603
604
605
606
607
608
609
610
611
612
613
614
615
616
617
618
619
620
621
622
623
624
625
626
627
628
629
630
631
632
633
634
635
636
637
638
639
640
641
642
643
644
645
646
647
648
649
650
651
652
653
654
655
656
657
658
659
660
661
662
663
664
665
666
667
668
669
670
671
672
673
674
675
676
677
678
679
680
681
682
683
684
685
686
687
688
689
690
691
692
693
694
695
696
697
698
699
700
701
702
703
704
705
706
707
708
709
710
711
712
713
714
715
716
717
718
719
720
721
722
723
724
725
726
727
728
729
730
731
732
733
734
735
736
737
738
739
740
741
742
743
744
745
746
747
748
749
750
751
752
753
754
755
756
757
758
759
760
761
762
763
764
765
766
767
768
769
770
771
772
773
774
775
776
777
778
779
780
781
782
783
784
785
786
787
788
789
790
791
792
793
794
795
796
797
798
799
800
801
802
803
804
805
806
807
808
809
810
811
812
813
814
815
816
817
818
819
820
821
822
823
824
825
826
827
828
829
830
831
832
833
834
835
836
837
/*
    comedi/drivers/das16cs.c
    Driver for Computer Boards PC-CARD DAS16/16.

    COMEDI - Linux Control and Measurement Device Interface
    Copyright (C) 2000, 2001, 2002 David A. Schleef <ds@schleef.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: cb_das16_cs
Description: Computer Boards PC-CARD DAS16/16
Devices: [ComputerBoards] PC-CARD DAS16/16 (cb_das16_cs), PC-CARD DAS16/16-AO
Author: ds
Updated: Mon, 04 Nov 2002 20:04:21 -0800
Status: experimental


*/

#include <linux/interrupt.h>
#include <linux/slab.h>
#include "../comedidev.h"
#include <linux/delay.h>
#include <linux/pci.h>

#include <pcmcia/cistpl.h>
#include <pcmcia/ds.h>

#include "8253.h"

#define DAS16CS_SIZE			18

#define DAS16CS_ADC_DATA		0
#define DAS16CS_DIO_MUX			2
#define DAS16CS_MISC1			4
#define DAS16CS_MISC2			6
#define DAS16CS_CTR0			8
#define DAS16CS_CTR1			10
#define DAS16CS_CTR2			12
#define DAS16CS_CTR_CONTROL		14
#define DAS16CS_DIO			16

struct das16cs_board {
	const char *name;
	int device_id;
	int n_ao_chans;
};
static const struct das16cs_board das16cs_boards[] = {
	{
	 .device_id = 0x0000,	/* unknown */
	 .name = "PC-CARD DAS16/16",
	 .n_ao_chans = 0,
	 },
	{
	 .device_id = 0x0039,
	 .name = "PC-CARD DAS16/16-AO",
	 .n_ao_chans = 2,
	 },
	{
	 .device_id = 0x4009,
	 .name = "PCM-DAS16s/16",
	 .n_ao_chans = 0,
	 },
};

#define n_boards ARRAY_SIZE(das16cs_boards)
#define thisboard ((const struct das16cs_board *)dev->board_ptr)

struct das16cs_private {
	struct pcmcia_device *link;

	unsigned int ao_readback[2];
	unsigned short status1;
	unsigned short status2;
};
#define devpriv ((struct das16cs_private *)dev->private)

static int das16cs_attach(struct comedi_device *dev,
			  struct comedi_devconfig *it);
static int das16cs_detach(struct comedi_device *dev);
static struct comedi_driver driver_das16cs = {
	.driver_name = "cb_das16_cs",
	.module = THIS_MODULE,
	.attach = das16cs_attach,
	.detach = das16cs_detach,
};

static struct pcmcia_device *cur_dev;

static const struct comedi_lrange das16cs_ai_range = { 4, {
							   RANGE(-10, 10),
							   RANGE(-5, 5),
							   RANGE(-2.5, 2.5),
							   RANGE(-1.25, 1.25),
							   }
};

static irqreturn_t das16cs_interrupt(int irq, void *d);
static int das16cs_ai_rinsn(struct comedi_device *dev,
			    struct comedi_subdevice *s,
			    struct comedi_insn *insn, unsigned int *data);
static int das16cs_ai_cmd(struct comedi_device *dev,
			  struct comedi_subdevice *s);
static int das16cs_ai_cmdtest(struct comedi_device *dev,
			      struct comedi_subdevice *s,
			      struct comedi_cmd *cmd);
static int das16cs_ao_winsn(struct comedi_device *dev,
			    struct comedi_subdevice *s,
			    struct comedi_insn *insn, unsigned int *data);
static int das16cs_ao_rinsn(struct comedi_device *dev,
			    struct comedi_subdevice *s,
			    struct comedi_insn *insn, unsigned int *data);
static int das16cs_dio_insn_bits(struct comedi_device *dev,
				 struct comedi_subdevice *s,
				 struct comedi_insn *insn, unsigned int *data);
static int das16cs_dio_insn_config(struct comedi_device *dev,
				   struct comedi_subdevice *s,
				   struct comedi_insn *insn,
				   unsigned int *data);
static int das16cs_timer_insn_read(struct comedi_device *dev,
				   struct comedi_subdevice *s,
				   struct comedi_insn *insn,
				   unsigned int *data);
static int das16cs_timer_insn_config(struct comedi_device *dev,
				     struct comedi_subdevice *s,
				     struct comedi_insn *insn,
				     unsigned int *data);

static const struct das16cs_board *das16cs_probe(struct comedi_device *dev,
						 struct pcmcia_device *link)
{
	int i;

	for (i = 0; i < n_boards; i++) {
		if (das16cs_boards[i].device_id == link->card_id)
			return das16cs_boards + i;
	}

	dev_dbg(dev->hw_dev, "unknown board!\n");

	return NULL;
}

static int das16cs_attach(struct comedi_device *dev,
			  struct comedi_devconfig *it)
{
	struct pcmcia_device *link;
	struct comedi_subdevice *s;
	int ret;
	int i;

	dev_dbg(dev->hw_dev, "comedi%d: cb_das16_cs: attached\n", dev->minor);

	link = cur_dev;		/* XXX hack */
	if (!link)
		return -EIO;

	dev->iobase = link->resource[0]->start;
	dev_dbg(dev->hw_dev, "I/O base=0x%04lx\n", dev->iobase);

	dev_dbg(dev->hw_dev, "fingerprint:\n");
	for (i = 0; i < 48; i += 2)
		dev_dbg(dev->hw_dev, "%04x\n", inw(dev->iobase + i));


	ret = request_irq(link->irq, das16cs_interrupt,
			  IRQF_SHARED, "cb_das16_cs", dev);
	if (ret < 0)
		return ret;

	dev->irq = link->irq;

	dev_dbg(dev->hw_dev, "irq=%u\n", dev->irq);

	dev->board_ptr = das16cs_probe(dev, link);
	if (!dev->board_ptr)
		return -EIO;

	dev->board_name = thisboard->name;

	if (alloc_private(dev, sizeof(struct das16cs_private)) < 0)
		return -ENOMEM;

	if (alloc_subdevices(dev, 4) < 0)
		return -ENOMEM;

	s = dev->subdevices + 0;
	dev->read_subdev = s;
	/* analog input subdevice */
	s->type = COMEDI_SUBD_AI;
	s->subdev_flags = SDF_READABLE | SDF_GROUND | SDF_DIFF | SDF_CMD_READ;
	s->n_chan = 16;
	s->maxdata = 0xffff;
	s->range_table = &das16cs_ai_range;
	s->len_chanlist = 16;
	s->insn_read = das16cs_ai_rinsn;
	s->do_cmd = das16cs_ai_cmd;
	s->do_cmdtest = das16cs_ai_cmdtest;

	s = dev->subdevices + 1;
	/* analog output subdevice */
	if (thisboard->n_ao_chans) {
		s->type = COMEDI_SUBD_AO;
		s->subdev_flags = SDF_WRITABLE;
		s->n_chan = thisboard->n_ao_chans;
		s->maxdata = 0xffff;
		s->range_table = &range_bipolar10;
		s->insn_write = &das16cs_ao_winsn;
		s->insn_read = &das16cs_ao_rinsn;
	}

	s = dev->subdevices + 2;
	/* digital i/o subdevice */
	if (1) {
		s->type = COMEDI_SUBD_DIO;
		s->subdev_flags = SDF_READABLE | SDF_WRITABLE;
		s->n_chan = 8;
		s->maxdata = 1;
		s->range_table = &range_digital;
		s->insn_bits = das16cs_dio_insn_bits;
		s->insn_config = das16cs_dio_insn_config;
	} else {
		s->type = COMEDI_SUBD_UNUSED;
	}

	s = dev->subdevices + 3;
	/* timer subdevice */
	if (0) {
		s->type = COMEDI_SUBD_TIMER;
		s->subdev_flags = SDF_READABLE | SDF_WRITABLE;
		s->n_chan = 1;
		s->maxdata = 0xff;
		s->range_table = &range_unknown;
		s->insn_read = das16cs_timer_insn_read;
		s->insn_config = das16cs_timer_insn_config;
	} else {
		s->type = COMEDI_SUBD_UNUSED;
	}


	return 1;
}

static int das16cs_detach(struct comedi_device *dev)
{
	dev_dbg(dev->hw_dev, "comedi%d: das16cs: remove\n", dev->minor);

	if (dev->irq)
		free_irq(dev->irq, dev);


	return 0;
}

static irqreturn_t das16cs_interrupt(int irq, void *d)
{
	/* struct comedi_device *dev = d; */
	return IRQ_HANDLED;
}

/*
 * "instructions" read/write data in "one-shot" or "software-triggered"
 * mode.
 */
static int das16cs_ai_rinsn(struct comedi_device *dev,
			    struct comedi_subdevice *s,
			    struct comedi_insn *insn, unsigned int *data)
{
	int i;
	int to;
	int aref;
	int range;
	int chan;
	static int range_bits[] = { 0x800, 0x000, 0x100, 0x200 };

	chan = CR_CHAN(insn->chanspec);
	aref = CR_AREF(insn->chanspec);
	range = CR_RANGE(insn->chanspec);

	outw(chan, dev->iobase + 2);

	devpriv->status1 &= ~0xf320;
	devpriv->status1 |= (aref == AREF_DIFF) ? 0 : 0x0020;
	outw(devpriv->status1, dev->iobase + 4);

	devpriv->status2 &= ~0xff00;
	devpriv->status2 |= range_bits[range];
	outw(devpriv->status2, dev->iobase + 6);

	for (i = 0; i < insn->n; i++) {
		outw(0, dev->iobase);

#define TIMEOUT 1000
		for (to = 0; to < TIMEOUT; to++) {
			if (inw(dev->iobase + 4) & 0x0080)
				break;
		}
		if (to == TIMEOUT) {
			dev_dbg(dev->hw_dev, "cb_das16_cs: ai timeout\n");
			return -ETIME;
		}
		data[i] = (unsigned short)inw(dev->iobase + 0);
	}

	return i;
}

static int das16cs_ai_cmd(struct comedi_device *dev, struct comedi_subdevice *s)
{
	return -EINVAL;
}

static int das16cs_ai_cmdtest(struct comedi_device *dev,
			      struct comedi_subdevice *s,
			      struct comedi_cmd *cmd)
{
	int err = 0;
	int tmp;

	/* cmdtest tests a particular command to see if it is valid.
	 * Using the cmdtest ioctl, a user can create a valid cmd
	 * and then have it executes by the cmd ioctl.
	 *
	 * cmdtest returns 1,2,3,4 or 0, depending on which tests
	 * the command passes. */

	/* step 1: make sure trigger sources are trivially valid */

	tmp = cmd->start_src;
	cmd->start_src &= TRIG_NOW;
	if (!cmd->start_src || tmp != cmd->start_src)
		err++;

	tmp = cmd->scan_begin_src;
	cmd->scan_begin_src &= TRIG_TIMER | TRIG_EXT;
	if (!cmd->scan_begin_src || tmp != cmd->scan_begin_src)
		err++;

	tmp = cmd->convert_src;
	cmd->convert_src &= TRIG_TIMER | TRIG_EXT;
	if (!cmd->convert_src || tmp != cmd->convert_src)
		err++;

	tmp = cmd->scan_end_src;
	cmd->scan_end_src &= TRIG_COUNT;
	if (!cmd->scan_end_src || tmp != cmd->scan_end_src)
		err++;

	tmp = cmd->stop_src;
	cmd->stop_src &= TRIG_COUNT | TRIG_NONE;
	if (!cmd->stop_src || tmp != cmd->stop_src)
		err++;

	if (err)
		return 1;

	/* step 2: make sure trigger sources are unique and
	 * mutually compatible */

	/* note that mutual compatibility is not an issue here */
	if (cmd->scan_begin_src != TRIG_TIMER &&
	    cmd->scan_begin_src != TRIG_EXT)
		err++;
	if (cmd->convert_src != TRIG_TIMER && cmd->convert_src != TRIG_EXT)
		err++;
	if (cmd->stop_src != TRIG_COUNT && cmd->stop_src != TRIG_NONE)
		err++;

	if (err)
		return 2;

	/* step 3: make sure arguments are trivially compatible */

	if (cmd->start_arg != 0) {
		cmd->start_arg = 0;
		err++;
	}
#define MAX_SPEED	10000	/* in nanoseconds */
#define MIN_SPEED	1000000000	/* in nanoseconds */

	if (cmd->scan_begin_src == TRIG_TIMER) {
		if (cmd->scan_begin_arg < MAX_SPEED) {
			cmd->scan_begin_arg = MAX_SPEED;
			err++;
		}
		if (cmd->scan_begin_arg > MIN_SPEED) {
			cmd->scan_begin_arg = MIN_SPEED;
			err++;
		}
	} else {
		/* external trigger */
		/* should be level/edge, hi/lo specification here */
		/* should specify multiple external triggers */
		if (cmd->scan_begin_arg > 9) {
			cmd->scan_begin_arg = 9;
			err++;
		}
	}
	if (cmd->convert_src == TRIG_TIMER) {
		if (cmd->convert_arg < MAX_SPEED) {
			cmd->convert_arg = MAX_SPEED;
			err++;
		}
		if (cmd->convert_arg > MIN_SPEED) {
			cmd->convert_arg = MIN_SPEED;
			err++;
		}
	} else {
		/* external trigger */
		/* see above */
		if (cmd->convert_arg > 9) {
			cmd->convert_arg = 9;
			err++;
		}
	}

	if (cmd->scan_end_arg != cmd->chanlist_len) {
		cmd->scan_end_arg = cmd->chanlist_len;
		err++;
	}
	if (cmd->stop_src == TRIG_COUNT) {
		if (cmd->stop_arg > 0x00ffffff) {
			cmd->stop_arg = 0x00ffffff;
			err++;
		}
	} else {
		/* TRIG_NONE */
		if (cmd->stop_arg != 0) {
			cmd->stop_arg = 0;
			err++;
		}
	}

	if (err)
		return 3;

	/* step 4: fix up any arguments */

	if (cmd->scan_begin_src == TRIG_TIMER) {
		unsigned int div1 = 0, div2 = 0;

		tmp = cmd->scan_begin_arg;
		i8253_cascade_ns_to_timer(100, &div1, &div2,
					  &cmd->scan_begin_arg,
					  cmd->flags & TRIG_ROUND_MASK);
		if (tmp != cmd->scan_begin_arg)
			err++;
	}
	if (cmd->convert_src == TRIG_TIMER) {
		unsigned int div1 = 0, div2 = 0;

		tmp = cmd->convert_arg;
		i8253_cascade_ns_to_timer(100, &div1, &div2,
					  &cmd->scan_begin_arg,
					  cmd->flags & TRIG_ROUND_MASK);
		if (tmp != cmd->convert_arg)
			err++;
		if (cmd->scan_begin_src == TRIG_TIMER &&
		    cmd->scan_begin_arg <
		    cmd->convert_arg * cmd->scan_end_arg) {
			cmd->scan_begin_arg =
			    cmd->convert_arg * cmd->scan_end_arg;
			err++;
		}
	}

	if (err)
		return 4;

	return 0;
}

static int das16cs_ao_winsn(struct comedi_device *dev,
			    struct comedi_subdevice *s,
			    struct comedi_insn *insn, unsigned int *data)
{
	int i;
	int chan = CR_CHAN(insn->chanspec);
	unsigned short status1;
	unsigned short d;
	int bit;

	for (i = 0; i < insn->n; i++) {
		devpriv->ao_readback[chan] = data[i];
		d = data[i];

		outw(devpriv->status1, dev->iobase + 4);
		udelay(1);

		status1 = devpriv->status1 & ~0xf;
		if (chan)
			status1 |= 0x0001;
		else
			status1 |= 0x0008;

/*		printk("0x%04x\n",status1);*/
		outw(status1, dev->iobase + 4);
		udelay(1);

		for (bit = 15; bit >= 0; bit--) {
			int b = (d >> bit) & 0x1;
			b <<= 1;
/*			printk("0x%04x\n",status1 | b | 0x0000);*/
			outw(status1 | b | 0x0000, dev->iobase + 4);
			udelay(1);
/*			printk("0x%04x\n",status1 | b | 0x0004);*/
			outw(status1 | b | 0x0004, dev->iobase + 4);
			udelay(1);
		}
/*		make high both DAC0CS and DAC1CS to load
		new data and update analog output*/
		outw(status1 | 0x9, dev->iobase + 4);
	}

	return i;
}

/* AO subdevices should have a read insn as well as a write insn.
 * Usually this means copying a value stored in devpriv. */
static int das16cs_ao_rinsn(struct comedi_device *dev,
			    struct comedi_subdevice *s,
			    struct comedi_insn *insn, unsigned int *data)
{
	int i;
	int chan = CR_CHAN(insn->chanspec);

	for (i = 0; i < insn->n; i++)
		data[i] = devpriv->ao_readback[chan];

	return i;
}

/* DIO devices are slightly special.  Although it is possible to
 * implement the insn_read/insn_write interface, it is much more
 * useful to applications if you implement the insn_bits interface.
 * This allows packed reading/writing of the DIO channels.  The
 * comedi core can convert between insn_bits and insn_read/write */
static int das16cs_dio_insn_bits(struct comedi_device *dev,
				 struct comedi_subdevice *s,
				 struct comedi_insn *insn, unsigned int *data)
{
	if (insn->n != 2)
		return -EINVAL;

	if (data[0]) {
		s->state &= ~data[0];
		s->state |= data[0] & data[1];

		outw(s->state, dev->iobase + 16);
	}

	/* on return, data[1] contains the value of the digital
	 * input and output lines. */
	data[1] = inw(dev->iobase + 16);

	return 2;
}

static int das16cs_dio_insn_config(struct comedi_device *dev,
				   struct comedi_subdevice *s,
				   struct comedi_insn *insn, unsigned int *data)
{
	int chan = CR_CHAN(insn->chanspec);
	int bits;

	if (chan < 4)
		bits = 0x0f;
	else
		bits = 0xf0;

	switch (data[0]) {
	case INSN_CONFIG_DIO_OUTPUT:
		s->io_bits |= bits;
		break;
	case INSN_CONFIG_DIO_INPUT:
		s->io_bits &= bits;
		break;
	case INSN_CONFIG_DIO_QUERY:
		data[1] =
		    (s->io_bits & (1 << chan)) ? COMEDI_OUTPUT : COMEDI_INPUT;
		return insn->n;
		break;
	default:
		return -EINVAL;
		break;
	}

	devpriv->status2 &= ~0x00c0;
	devpriv->status2 |= (s->io_bits & 0xf0) ? 0x0080 : 0;
	devpriv->status2 |= (s->io_bits & 0x0f) ? 0x0040 : 0;

	outw(devpriv->status2, dev->iobase + 6);

	return insn->n;
}

static int das16cs_timer_insn_read(struct comedi_device *dev,
				   struct comedi_subdevice *s,
				   struct comedi_insn *insn, unsigned int *data)
{
	return -EINVAL;
}

static int das16cs_timer_insn_config(struct comedi_device *dev,
				     struct comedi_subdevice *s,
				     struct comedi_insn *insn,
				     unsigned int *data)
{
	return -EINVAL;
}

/* PCMCIA stuff */

/*======================================================================

    The following pcmcia code for the pcm-das08 is adapted from the
    dummy_cs.c driver of the Linux PCMCIA Card Services package.

    The initial developer of the original code is David A. Hinds
    <dahinds@users.sourceforge.net>.  Portions created by David A. Hinds
    are Copyright (C) 1999 David A. Hinds.  All Rights Reserved.

======================================================================*/

#if defined(CONFIG_PCMCIA) || defined(CONFIG_PCMCIA_MODULE)

static void das16cs_pcmcia_config(struct pcmcia_device *link);
static void das16cs_pcmcia_release(struct pcmcia_device *link);
static int das16cs_pcmcia_suspend(struct pcmcia_device *p_dev);
static int das16cs_pcmcia_resume(struct pcmcia_device *p_dev);

/*
   The attach() and detach() entry points are used to create and destroy
   "instances" of the driver, where each instance represents everything
   needed to manage one actual PCMCIA card.
*/

static int das16cs_pcmcia_attach(struct pcmcia_device *);
static void das16cs_pcmcia_detach(struct pcmcia_device *);

/*
   You'll also need to prototype all the functions that will actually
   be used to talk to your device.  See 'memory_cs' for a good example
   of a fully self-sufficient driver; the other drivers rely more or
   less on other parts of the kernel.
*/

struct local_info_t {
	struct pcmcia_device *link;
	int stop;
	struct bus_operations *bus;
};

/*======================================================================

    das16cs_pcmcia_attach() creates an "instance" of the driver, allocating
    local data structures for one device.  The device is registered
    with Card Services.

    The dev_link structure is initialized, but we don't actually
    configure the card at this point -- we wait until we receive a
    card insertion event.

======================================================================*/

static int das16cs_pcmcia_attach(struct pcmcia_device *link)
{
	struct local_info_t *local;

	dev_dbg(&link->dev, "das16cs_pcmcia_attach()\n");

	/* Allocate space for private device-specific data */
	local = kzalloc(sizeof(struct local_info_t), GFP_KERNEL);
	if (!local)
		return -ENOMEM;
	local->link = link;
	link->priv = local;

	cur_dev = link;

	das16cs_pcmcia_config(link);

	return 0;
}				/* das16cs_pcmcia_attach */

static void das16cs_pcmcia_detach(struct pcmcia_device *link)
{
	dev_dbg(&link->dev, "das16cs_pcmcia_detach\n");

	((struct local_info_t *)link->priv)->stop = 1;
	das16cs_pcmcia_release(link);
	/* This points to the parent struct local_info_t struct */
	kfree(link->priv);
}				/* das16cs_pcmcia_detach */


static int das16cs_pcmcia_config_loop(struct pcmcia_device *p_dev,
				void *priv_data)
{
	if (p_dev->config_index == 0)
		return -EINVAL;

	return pcmcia_request_io(p_dev);
}

static void das16cs_pcmcia_config(struct pcmcia_device *link)
{
	int ret;

	dev_dbg(&link->dev, "das16cs_pcmcia_config\n");

	/* Do we need to allocate an interrupt? */
	link->config_flags |= CONF_ENABLE_IRQ | CONF_AUTO_SET_IO;

	ret = pcmcia_loop_config(link, das16cs_pcmcia_config_loop, NULL);
	if (ret) {
		dev_warn(&link->dev, "no configuration found\n");
		goto failed;
	}

	if (!link->irq)
		goto failed;

	ret = pcmcia_enable_device(link);
	if (ret)
		goto failed;

	return;

failed:
	das16cs_pcmcia_release(link);
}				/* das16cs_pcmcia_config */

static void das16cs_pcmcia_release(struct pcmcia_device *link)
{
	dev_dbg(&link->dev, "das16cs_pcmcia_release\n");
	pcmcia_disable_device(link);
}				/* das16cs_pcmcia_release */

static int das16cs_pcmcia_suspend(struct pcmcia_device *link)
{
	struct local_info_t *local = link->priv;

	/* Mark the device as stopped, to block IO until later */
	local->stop = 1;

	return 0;
}				/* das16cs_pcmcia_suspend */

static int das16cs_pcmcia_resume(struct pcmcia_device *link)
{
	struct local_info_t *local = link->priv;

	local->stop = 0;
	return 0;
}				/* das16cs_pcmcia_resume */

/*====================================================================*/

static const struct pcmcia_device_id das16cs_id_table[] = {
	PCMCIA_DEVICE_MANF_CARD(0x01c5, 0x0039),
	PCMCIA_DEVICE_MANF_CARD(0x01c5, 0x4009),
	PCMCIA_DEVICE_NULL
};

MODULE_DEVICE_TABLE(pcmcia, das16cs_id_table);
MODULE_AUTHOR("David A. Schleef <ds@schleef.org>");
MODULE_DESCRIPTION("Comedi driver for Computer Boards PC-CARD DAS16/16");
MODULE_LICENSE("GPL");

struct pcmcia_driver das16cs_driver = {
	.probe = das16cs_pcmcia_attach,
	.remove = das16cs_pcmcia_detach,
	.suspend = das16cs_pcmcia_suspend,
	.resume = das16cs_pcmcia_resume,
	.id_table = das16cs_id_table,
	.owner = THIS_MODULE,
	.name = "cb_das16_cs",
};

static int __init init_das16cs_pcmcia_cs(void)
{
	pcmcia_register_driver(&das16cs_driver);
	return 0;
}

static void __exit exit_das16cs_pcmcia_cs(void)
{
	pr_debug("das16cs_pcmcia_cs: unloading\n");
	pcmcia_unregister_driver(&das16cs_driver);
}

int __init init_module(void)
{
	int ret;

	ret = init_das16cs_pcmcia_cs();
	if (ret < 0)
		return ret;

	return comedi_driver_register(&driver_das16cs);
}

void __exit cleanup_module(void)
{
	exit_das16cs_pcmcia_cs();
	comedi_driver_unregister(&driver_das16cs);
}

#else
static int __init driver_das16cs_init_module(void)
{
	return comedi_driver_register(&driver_das16cs);
}

static void __exit driver_das16cs_cleanup_module(void)
{
	comedi_driver_unregister(&driver_das16cs);
}

module_init(driver_das16cs_init_module);
module_exit(driver_das16cs_cleanup_module);
#endif /* CONFIG_PCMCIA */