summaryrefslogtreecommitdiffstats
path: root/drivers/staging/comedi/comedidev.h
blob: a7d569cfca5db6b613e31d54eecb48e08f96413e (plain)
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
838
839
840
841
842
843
844
845
846
847
848
849
850
851
852
853
854
855
856
857
858
859
860
861
862
863
864
865
866
867
868
869
870
871
872
873
874
875
876
877
878
879
880
881
882
883
884
885
886
887
888
889
890
891
892
893
894
895
896
897
898
899
900
901
902
903
904
905
906
907
908
909
910
911
912
913
914
915
916
917
918
919
920
921
922
923
924
925
926
927
928
929
930
931
932
933
934
935
936
937
938
939
940
941
942
943
944
945
946
947
948
949
950
951
952
953
954
955
956
957
958
959
960
961
962
963
964
965
966
967
968
969
970
971
972
973
974
975
976
977
978
979
980
981
982
983
984
985
986
987
988
989
990
991
992
993
994
995
996
997
998
999
1000
1001
1002
1003
1004
1005
1006
1007
1008
1009
1010
1011
1012
1013
1014
1015
1016
1017
1018
1019
1020
1021
1022
1023
1024
1025
1026
1027
1028
1029
1030
1031
1032
1033
1034
1035
1036
1037
1038
1039
1040
1041
1042
1043
1044
1045
1046
1047
1048
1049
1050
1051
1052
/* SPDX-License-Identifier: GPL-2.0+ */
/*
 * comedidev.h
 * header file for kernel-only structures, variables, and constants
 *
 * COMEDI - Linux Control and Measurement Device Interface
 * Copyright (C) 1997-2000 David A. Schleef <ds@schleef.org>
 */

#ifndef _COMEDIDEV_H
#define _COMEDIDEV_H

#include <linux/dma-mapping.h>
#include <linux/mutex.h>
#include <linux/spinlock_types.h>
#include <linux/rwsem.h>
#include <linux/kref.h>

#include "comedi.h"

#define COMEDI_VERSION(a, b, c) (((a) << 16) + ((b) << 8) + (c))
#define COMEDI_VERSION_CODE COMEDI_VERSION(COMEDI_MAJORVERSION, \
	COMEDI_MINORVERSION, COMEDI_MICROVERSION)
#define COMEDI_RELEASE VERSION

#define COMEDI_NUM_BOARD_MINORS 0x30

/**
 * struct comedi_subdevice - Working data for a COMEDI subdevice
 * @device: COMEDI device to which this subdevice belongs.  (Initialized by
 *	comedi_alloc_subdevices().)
 * @index: Index of this subdevice within device's array of subdevices.
 *	(Initialized by comedi_alloc_subdevices().)
 * @type: Type of subdevice from &enum comedi_subdevice_type.  (Initialized by
 *	the low-level driver.)
 * @n_chan: Number of channels the subdevice supports.  (Initialized by the
 *	low-level driver.)
 * @subdev_flags: Various "SDF" flags indicating aspects of the subdevice to
 *	the COMEDI core and user application.  (Initialized by the low-level
 *	driver.)
 * @len_chanlist: Maximum length of a channel list if the subdevice supports
 *	asynchronous acquisition commands.  (Optionally initialized by the
 *	low-level driver, or changed from 0 to 1 during post-configuration.)
 * @private: Private data pointer which is either set by the low-level driver
 *	itself, or by a call to comedi_alloc_spriv() which allocates storage.
 *	In the latter case, the storage is automatically freed after the
 *	low-level driver's "detach" handler is called for the device.
 *	(Initialized by the low-level driver.)
 * @async: Pointer to &struct comedi_async id the subdevice supports
 *	asynchronous acquisition commands.  (Allocated and initialized during
 *	post-configuration if needed.)
 * @lock: Pointer to a file object that performed a %COMEDI_LOCK ioctl on the
 *	subdevice.  (Initially NULL.)
 * @busy: Pointer to a file object that is performing an asynchronous
 *	acquisition command on the subdevice.  (Initially NULL.)
 * @runflags: Internal flags for use by COMEDI core, mostly indicating whether
 *	an asynchronous acquisition command is running.
 * @spin_lock: Generic spin-lock for use by the COMEDI core and the low-level
 *	driver.  (Initialized by comedi_alloc_subdevices().)
 * @io_bits: Bit-mask indicating the channel directions for a DIO subdevice
 *	with no more than 32 channels.  A '1' at a bit position indicates the
 *	corresponding channel is configured as an output.  (Initialized by the
 *	low-level driver for a DIO subdevice.  Forced to all-outputs during
 *	post-configuration for a digital output subdevice.)
 * @maxdata: If non-zero, this is the maximum raw data value of each channel.
 *	If zero, the maximum data value is channel-specific.  (Initialized by
 *	the low-level driver.)
 * @maxdata_list: If the maximum data value is channel-specific, this points
 *	to an array of maximum data values indexed by channel index.
 *	(Initialized by the low-level driver.)
 * @range_table: If non-NULL, this points to a COMEDI range table for the
 *	subdevice.  If NULL, the range table is channel-specific.  (Initialized
 *	by the low-level driver, will be set to an "invalid" range table during
 *	post-configuration if @range_table and @range_table_list are both
 *	NULL.)
 * @range_table_list: If the COMEDI range table is channel-specific, this
 *	points to an array of pointers to COMEDI range tables indexed by
 *	channel number.  (Initialized by the low-level driver.)
 * @chanlist: Not used.
 * @insn_read: Optional pointer to a handler for the %INSN_READ instruction.
 *	(Initialized by the low-level driver, or set to a default handler
 *	during post-configuration.)
 * @insn_write: Optional pointer to a handler for the %INSN_WRITE instruction.
 *	(Initialized by the low-level driver, or set to a default handler
 *	during post-configuration.)
 * @insn_bits: Optional pointer to a handler for the %INSN_BITS instruction
 *	for a digital input, digital output or digital input/output subdevice.
 *	(Initialized by the low-level driver, or set to a default handler
 *	during post-configuration.)
 * @insn_config: Optional pointer to a handler for the %INSN_CONFIG
 *	instruction.  (Initialized by the low-level driver, or set to a default
 *	handler during post-configuration.)
 * @do_cmd: If the subdevice supports asynchronous acquisition commands, this
 *	points to a handler to set it up in hardware.  (Initialized by the
 *	low-level driver.)
 * @do_cmdtest: If the subdevice supports asynchronous acquisition commands,
 *	this points to a handler used to check and possibly tweak a prospective
 *	acquisition command without setting it up in hardware.  (Initialized by
 *	the low-level driver.)
 * @poll: If the subdevice supports asynchronous acquisition commands, this
 *	is an optional pointer to a handler for the %COMEDI_POLL ioctl which
 *	instructs the low-level driver to synchronize buffers.  (Initialized by
 *	the low-level driver if needed.)
 * @cancel: If the subdevice supports asynchronous acquisition commands, this
 *	points to a handler used to terminate a running command.  (Initialized
 *	by the low-level driver.)
 * @buf_change: If the subdevice supports asynchronous acquisition commands,
 *	this is an optional pointer to a handler that is called when the data
 *	buffer for handling asynchronous commands is allocated or reallocated.
 *	(Initialized by the low-level driver if needed.)
 * @munge: If the subdevice supports asynchronous acquisition commands and
 *	uses DMA to transfer data from the hardware to the acquisition buffer,
 *	this points to a function used to "munge" the data values from the
 *	hardware into the format expected by COMEDI.  (Initialized by the
 *	low-level driver if needed.)
 * @async_dma_dir: If the subdevice supports asynchronous acquisition commands
 *	and uses DMA to transfer data from the hardware to the acquisition
 *	buffer, this sets the DMA direction for the buffer. (initialized to
 *	%DMA_NONE by comedi_alloc_subdevices() and changed by the low-level
 *	driver if necessary.)
 * @state: Handy bit-mask indicating the output states for a DIO or digital
 *	output subdevice with no more than 32 channels. (Initialized by the
 *	low-level driver.)
 * @class_dev: If the subdevice supports asynchronous acquisition commands,
 *	this points to a sysfs comediX_subdY device where X is the minor device
 *	number of the COMEDI device and Y is the subdevice number.  The minor
 *	device number for the sysfs device is allocated dynamically in the
 *	range 48 to 255.  This is used to allow the COMEDI device to be opened
 *	with a different default read or write subdevice.  (Allocated during
 *	post-configuration if needed.)
 * @minor: If @class_dev is set, this is its dynamically allocated minor
 *	device number.  (Set during post-configuration if necessary.)
 * @readback: Optional pointer to memory allocated by
 *	comedi_alloc_subdev_readback() used to hold the values written to
 *	analog output channels so they can be read back.  The storage is
 *	automatically freed after the low-level driver's "detach" handler is
 *	called for the device.  (Initialized by the low-level driver.)
 *
 * This is the main control structure for a COMEDI subdevice.  If the subdevice
 * supports asynchronous acquisition commands, additional information is stored
 * in the &struct comedi_async pointed to by @async.
 *
 * Most of the subdevice is initialized by the low-level driver's "attach" or
 * "auto_attach" handlers but parts of it are initialized by
 * comedi_alloc_subdevices(), and other parts are initialized during
 * post-configuration on return from that handler.
 *
 * A low-level driver that sets @insn_bits for a digital input, digital output,
 * or DIO subdevice may leave @insn_read and @insn_write uninitialized, in
 * which case they will be set to a default handler during post-configuration
 * that uses @insn_bits to emulate the %INSN_READ and %INSN_WRITE instructions.
 */
struct comedi_subdevice {
	struct comedi_device *device;
	int index;
	int type;
	int n_chan;
	int subdev_flags;
	int len_chanlist;	/* maximum length of channel/gain list */

	void *private;

	struct comedi_async *async;

	void *lock;
	void *busy;
	unsigned int runflags;
	spinlock_t spin_lock;	/* generic spin-lock for COMEDI and drivers */

	unsigned int io_bits;

	unsigned int maxdata;	/* if maxdata==0, use list */
	const unsigned int *maxdata_list;	/* list is channel specific */

	const struct comedi_lrange *range_table;
	const struct comedi_lrange *const *range_table_list;

	unsigned int *chanlist;	/* driver-owned chanlist (not used) */

	int (*insn_read)(struct comedi_device *dev, struct comedi_subdevice *s,
			 struct comedi_insn *insn, unsigned int *data);
	int (*insn_write)(struct comedi_device *dev, struct comedi_subdevice *s,
			  struct comedi_insn *insn, unsigned int *data);
	int (*insn_bits)(struct comedi_device *dev, struct comedi_subdevice *s,
			 struct comedi_insn *insn, unsigned int *data);
	int (*insn_config)(struct comedi_device *dev,
			   struct comedi_subdevice *s,
			   struct comedi_insn *insn,
			   unsigned int *data);

	int (*do_cmd)(struct comedi_device *dev, struct comedi_subdevice *s);
	int (*do_cmdtest)(struct comedi_device *dev,
			  struct comedi_subdevice *s,
			  struct comedi_cmd *cmd);
	int (*poll)(struct comedi_device *dev, struct comedi_subdevice *s);
	int (*cancel)(struct comedi_device *dev, struct comedi_subdevice *s);

	/* called when the buffer changes */
	int (*buf_change)(struct comedi_device *dev,
			  struct comedi_subdevice *s);

	void (*munge)(struct comedi_device *dev, struct comedi_subdevice *s,
		      void *data, unsigned int num_bytes,
		      unsigned int start_chan_index);
	enum dma_data_direction async_dma_dir;

	unsigned int state;

	struct device *class_dev;
	int minor;

	unsigned int *readback;
};

/**
 * struct comedi_buf_page - Describe a page of a COMEDI buffer
 * @virt_addr: Kernel address of page.
 * @dma_addr: DMA address of page if in DMA coherent memory.
 */
struct comedi_buf_page {
	void *virt_addr;
	dma_addr_t dma_addr;
};

/**
 * struct comedi_buf_map - Describe pages in a COMEDI buffer
 * @dma_hw_dev: Low-level hardware &struct device pointer copied from the
 *	COMEDI device's hw_dev member.
 * @page_list: Pointer to array of &struct comedi_buf_page, one for each
 *	page in the buffer.
 * @n_pages: Number of pages in the buffer.
 * @dma_dir: DMA direction used to allocate pages of DMA coherent memory,
 *	or %DMA_NONE if pages allocated from regular memory.
 * @refcount: &struct kref reference counter used to free the buffer.
 *
 * A COMEDI data buffer is allocated as individual pages, either in
 * conventional memory or DMA coherent memory, depending on the attached,
 * low-level hardware device.  (The buffer pages also get mapped into the
 * kernel's contiguous virtual address space pointed to by the 'prealloc_buf'
 * member of &struct comedi_async.)
 *
 * The buffer is normally freed when the COMEDI device is detached from the
 * low-level driver (which may happen due to device removal), but if it happens
 * to be mmapped at the time, the pages cannot be freed until the buffer has
 * been munmapped.  That is what the reference counter is for.  (The virtual
 * address space pointed by 'prealloc_buf' is freed when the COMEDI device is
 * detached.)
 */
struct comedi_buf_map {
	struct device *dma_hw_dev;
	struct comedi_buf_page *page_list;
	unsigned int n_pages;
	enum dma_data_direction dma_dir;
	struct kref refcount;
};

/**
 * struct comedi_async - Control data for asynchronous COMEDI commands
 * @prealloc_buf: Kernel virtual address of allocated acquisition buffer.
 * @prealloc_bufsz: Buffer size (in bytes).
 * @buf_map: Map of buffer pages.
 * @max_bufsize: Maximum allowed buffer size (in bytes).
 * @buf_write_count: "Write completed" count (in bytes, modulo 2**32).
 * @buf_write_alloc_count: "Allocated for writing" count (in bytes,
 *	modulo 2**32).
 * @buf_read_count: "Read completed" count (in bytes, modulo 2**32).
 * @buf_read_alloc_count: "Allocated for reading" count (in bytes,
 *	modulo 2**32).
 * @buf_write_ptr: Buffer position for writer.
 * @buf_read_ptr: Buffer position for reader.
 * @cur_chan: Current position in chanlist for scan (for those drivers that
 *	use it).
 * @scans_done: The number of scans completed.
 * @scan_progress: Amount received or sent for current scan (in bytes).
 * @munge_chan: Current position in chanlist for "munging".
 * @munge_count: "Munge" count (in bytes, modulo 2**32).
 * @munge_ptr: Buffer position for "munging".
 * @events: Bit-vector of events that have occurred.
 * @cmd: Details of comedi command in progress.
 * @wait_head: Task wait queue for file reader or writer.
 * @cb_mask: Bit-vector of events that should wake waiting tasks.
 * @inttrig: Software trigger function for command, or NULL.
 *
 * Note about the ..._count and ..._ptr members:
 *
 * Think of the _Count values being integers of unlimited size, indexing
 * into a buffer of infinite length (though only an advancing portion
 * of the buffer of fixed length prealloc_bufsz is accessible at any
 * time).  Then:
 *
 *   Buf_Read_Count <= Buf_Read_Alloc_Count <= Munge_Count <=
 *   Buf_Write_Count <= Buf_Write_Alloc_Count <=
 *   (Buf_Read_Count + prealloc_bufsz)
 *
 * (Those aren't the actual members, apart from prealloc_bufsz.) When the
 * buffer is reset, those _Count values start at 0 and only increase in value,
 * maintaining the above inequalities until the next time the buffer is
 * reset.  The buffer is divided into the following regions by the inequalities:
 *
 *   [0, Buf_Read_Count):
 *     old region no longer accessible
 *
 *   [Buf_Read_Count, Buf_Read_Alloc_Count):
 *     filled and munged region allocated for reading but not yet read
 *
 *   [Buf_Read_Alloc_Count, Munge_Count):
 *     filled and munged region not yet allocated for reading
 *
 *   [Munge_Count, Buf_Write_Count):
 *     filled region not yet munged
 *
 *   [Buf_Write_Count, Buf_Write_Alloc_Count):
 *     unfilled region allocated for writing but not yet written
 *
 *   [Buf_Write_Alloc_Count, Buf_Read_Count + prealloc_bufsz):
 *     unfilled region not yet allocated for writing
 *
 *   [Buf_Read_Count + prealloc_bufsz, infinity):
 *     unfilled region not yet accessible
 *
 * Data needs to be written into the buffer before it can be read out,
 * and may need to be converted (or "munged") between the two
 * operations.  Extra unfilled buffer space may need to allocated for
 * writing (advancing Buf_Write_Alloc_Count) before new data is written.
 * After writing new data, the newly filled space needs to be released
 * (advancing Buf_Write_Count).  This also results in the new data being
 * "munged" (advancing Munge_Count).  Before data is read out of the
 * buffer, extra space may need to be allocated for reading (advancing
 * Buf_Read_Alloc_Count).  After the data has been read out, the space
 * needs to be released (advancing Buf_Read_Count).
 *
 * The actual members, buf_read_count, buf_read_alloc_count,
 * munge_count, buf_write_count, and buf_write_alloc_count take the
 * value of the corresponding capitalized _Count values modulo 2^32
 * (UINT_MAX+1).  Subtracting a "higher" _count value from a "lower"
 * _count value gives the same answer as subtracting a "higher" _Count
 * value from a lower _Count value because prealloc_bufsz < UINT_MAX+1.
 * The modulo operation is done implicitly.
 *
 * The buf_read_ptr, munge_ptr, and buf_write_ptr members take the value
 * of the corresponding capitalized _Count values modulo prealloc_bufsz.
 * These correspond to byte indices in the physical buffer.  The modulo
 * operation is done by subtracting prealloc_bufsz when the value
 * exceeds prealloc_bufsz (assuming prealloc_bufsz plus the increment is
 * less than or equal to UINT_MAX).
 */
struct comedi_async {
	void *prealloc_buf;
	unsigned int prealloc_bufsz;
	struct comedi_buf_map *buf_map;
	unsigned int max_bufsize;
	unsigned int buf_write_count;
	unsigned int buf_write_alloc_count;
	unsigned int buf_read_count;
	unsigned int buf_read_alloc_count;
	unsigned int buf_write_ptr;
	unsigned int buf_read_ptr;
	unsigned int cur_chan;
	unsigned int scans_done;
	unsigned int scan_progress;
	unsigned int munge_chan;
	unsigned int munge_count;
	unsigned int munge_ptr;
	unsigned int events;
	struct comedi_cmd cmd;
	wait_queue_head_t wait_head;
	unsigned int cb_mask;
	int (*inttrig)(struct comedi_device *dev, struct comedi_subdevice *s,
		       unsigned int x);
};

/**
 * enum comedi_cb - &struct comedi_async callback "events"
 * @COMEDI_CB_EOS:		end-of-scan
 * @COMEDI_CB_EOA:		end-of-acquisition/output
 * @COMEDI_CB_BLOCK:		data has arrived, wakes up read() / write()
 * @COMEDI_CB_EOBUF:		DEPRECATED: end of buffer
 * @COMEDI_CB_ERROR:		card error during acquisition
 * @COMEDI_CB_OVERFLOW:		buffer overflow/underflow
 * @COMEDI_CB_ERROR_MASK:	events that indicate an error has occurred
 * @COMEDI_CB_CANCEL_MASK:	events that will cancel an async command
 */
enum comedi_cb {
	COMEDI_CB_EOS		= BIT(0),
	COMEDI_CB_EOA		= BIT(1),
	COMEDI_CB_BLOCK		= BIT(2),
	COMEDI_CB_EOBUF		= BIT(3),
	COMEDI_CB_ERROR		= BIT(4),
	COMEDI_CB_OVERFLOW	= BIT(5),
	/* masks */
	COMEDI_CB_ERROR_MASK	= (COMEDI_CB_ERROR | COMEDI_CB_OVERFLOW),
	COMEDI_CB_CANCEL_MASK	= (COMEDI_CB_EOA | COMEDI_CB_ERROR_MASK)
};

/**
 * struct comedi_driver - COMEDI driver registration
 * @driver_name: Name of driver.
 * @module: Owning module.
 * @attach: The optional "attach" handler for manually configured COMEDI
 *	devices.
 * @detach: The "detach" handler for deconfiguring COMEDI devices.
 * @auto_attach: The optional "auto_attach" handler for automatically
 *	configured COMEDI devices.
 * @num_names: Optional number of "board names" supported.
 * @board_name: Optional pointer to a pointer to a board name.  The pointer
 *	to a board name is embedded in an element of a driver-defined array
 *	of static, read-only board type information.
 * @offset: Optional size of each element of the driver-defined array of
 *	static, read-only board type information, i.e. the offset between each
 *	pointer to a board name.
 *
 * This is used with comedi_driver_register() and comedi_driver_unregister() to
 * register and unregister a low-level COMEDI driver with the COMEDI core.
 *
 * If @num_names is non-zero, @board_name should be non-NULL, and @offset
 * should be at least sizeof(*board_name).  These are used by the handler for
 * the %COMEDI_DEVCONFIG ioctl to match a hardware device and its driver by
 * board name.  If @num_names is zero, the %COMEDI_DEVCONFIG ioctl matches a
 * hardware device and its driver by driver name.  This is only useful if the
 * @attach handler is set.  If @num_names is non-zero, the driver's @attach
 * handler will be called with the COMEDI device structure's board_ptr member
 * pointing to the matched pointer to a board name within the driver's private
 * array of static, read-only board type information.
 *
 * The @detach handler has two roles.  If a COMEDI device was successfully
 * configured by the @attach or @auto_attach handler, it is called when the
 * device is being deconfigured (by the %COMEDI_DEVCONFIG ioctl, or due to
 * unloading of the driver, or due to device removal).  It is also called when
 * the @attach or @auto_attach handler returns an error.  Therefore, the
 * @attach or @auto_attach handlers can defer clean-up on error until the
 * @detach handler is called.  If the @attach or @auto_attach handlers free
 * any resources themselves, they must prevent the @detach handler from
 * freeing the same resources.  The @detach handler must not assume that all
 * resources requested by the @attach or @auto_attach handler were
 * successfully allocated.
 */
struct comedi_driver {
	/* private: */
	struct comedi_driver *next;	/* Next in list of COMEDI drivers. */
	/* public: */
	const char *driver_name;
	struct module *module;
	int (*attach)(struct comedi_device *dev, struct comedi_devconfig *it);
	void (*detach)(struct comedi_device *dev);
	int (*auto_attach)(struct comedi_device *dev, unsigned long context);
	unsigned int num_names;
	const char *const *board_name;
	int offset;
};

/**
 * struct comedi_device - Working data for a COMEDI device
 * @use_count: Number of open file objects.
 * @driver: Low-level COMEDI driver attached to this COMEDI device.
 * @pacer: Optional pointer to a dynamically allocated acquisition pacer
 *	control.  It is freed automatically after the COMEDI device is
 *	detached from the low-level driver.
 * @private: Optional pointer to private data allocated by the low-level
 *	driver.  It is freed automatically after the COMEDI device is
 *	detached from the low-level driver.
 * @class_dev: Sysfs comediX device.
 * @minor: Minor device number of COMEDI char device (0-47).
 * @detach_count: Counter incremented every time the COMEDI device is detached.
 *	Used for checking a previous attachment is still valid.
 * @hw_dev: Optional pointer to the low-level hardware &struct device.  It is
 *	required for automatically configured COMEDI devices and optional for
 *	COMEDI devices configured by the %COMEDI_DEVCONFIG ioctl, although
 *	the bus-specific COMEDI functions only work if it is set correctly.
 *	It is also passed to dma_alloc_coherent() for COMEDI subdevices that
 *	have their 'async_dma_dir' member set to something other than
 *	%DMA_NONE.
 * @board_name: Pointer to a COMEDI board name or a COMEDI driver name.  When
 *	the low-level driver's "attach" handler is called by the handler for
 *	the %COMEDI_DEVCONFIG ioctl, it either points to a matched board name
 *	string if the 'num_names' member of the &struct comedi_driver is
 *	non-zero, otherwise it points to the low-level driver name string.
 *	When the low-lever driver's "auto_attach" handler is called for an
 *	automatically configured COMEDI device, it points to the low-level
 *	driver name string.  The low-level driver is free to change it in its
 *	"attach" or "auto_attach" handler if it wishes.
 * @board_ptr: Optional pointer to private, read-only board type information in
 *	the low-level driver.  If the 'num_names' member of the &struct
 *	comedi_driver is non-zero, the handler for the %COMEDI_DEVCONFIG ioctl
 *	will point it to a pointer to a matched board name string within the
 *	driver's private array of static, read-only board type information when
 *	calling the driver's "attach" handler.  The low-level driver is free to
 *	change it.
 * @attached: Flag indicating that the COMEDI device is attached to a low-level
 *	driver.
 * @ioenabled: Flag used to indicate that a PCI device has been enabled and
 *	its regions requested.
 * @spinlock: Generic spin-lock for use by the low-level driver.
 * @mutex: Generic mutex for use by the COMEDI core module.
 * @attach_lock: &struct rw_semaphore used to guard against the COMEDI device
 *	being detached while an operation is in progress.  The down_write()
 *	operation is only allowed while @mutex is held and is used when
 *	changing @attached and @detach_count and calling the low-level driver's
 *	"detach" handler.  The down_read() operation is generally used without
 *	holding @mutex.
 * @refcount: &struct kref reference counter for freeing COMEDI device.
 * @n_subdevices: Number of COMEDI subdevices allocated by the low-level
 *	driver for this device.
 * @subdevices: Dynamically allocated array of COMEDI subdevices.
 * @mmio: Optional pointer to a remapped MMIO region set by the low-level
 *	driver.
 * @iobase: Optional base of an I/O port region requested by the low-level
 *	driver.
 * @iolen: Length of I/O port region requested at @iobase.
 * @irq: Optional IRQ number requested by the low-level driver.
 * @read_subdev: Optional pointer to a default COMEDI subdevice operated on by
 *	the read() file operation.  Set by the low-level driver.
 * @write_subdev: Optional pointer to a default COMEDI subdevice operated on by
 *	the write() file operation.  Set by the low-level driver.
 * @async_queue: Storage for fasync_helper().
 * @open: Optional pointer to a function set by the low-level driver to be
 *	called when @use_count changes from 0 to 1.
 * @close: Optional pointer to a function set by the low-level driver to be
 *	called when @use_count changed from 1 to 0.
 * @insn_device_config: Optional pointer to a handler for all sub-instructions
 *	except %INSN_DEVICE_CONFIG_GET_ROUTES of the %INSN_DEVICE_CONFIG
 *	instruction.  If this is not initialized by the low-level driver, a
 *	default handler will be set during post-configuration.
 * @get_valid_routes: Optional pointer to a handler for the
 *	%INSN_DEVICE_CONFIG_GET_ROUTES sub-instruction of the
 *	%INSN_DEVICE_CONFIG instruction set.  If this is not initialized by the
 *	low-level driver, a default handler that copies zero routes back to the
 *	user will be used.
 *
 * This is the main control data structure for a COMEDI device (as far as the
 * COMEDI core is concerned).  There are two groups of COMEDI devices -
 * "legacy" devices that are configured by the handler for the
 * %COMEDI_DEVCONFIG ioctl, and automatically configured devices resulting
 * from a call to comedi_auto_config() as a result of a bus driver probe in
 * a low-level COMEDI driver.  The "legacy" COMEDI devices are allocated
 * during module initialization if the "comedi_num_legacy_minors" module
 * parameter is non-zero and use minor device numbers from 0 to
 * comedi_num_legacy_minors minus one.  The automatically configured COMEDI
 * devices are allocated on demand and use minor device numbers from
 * comedi_num_legacy_minors to 47.
 */
struct comedi_device {
	int use_count;
	struct comedi_driver *driver;
	struct comedi_8254 *pacer;
	void *private;

	struct device *class_dev;
	int minor;
	unsigned int detach_count;
	struct device *hw_dev;

	const char *board_name;
	const void *board_ptr;
	unsigned int attached:1;
	unsigned int ioenabled:1;
	spinlock_t spinlock;	/* generic spin-lock for low-level driver */
	struct mutex mutex;	/* generic mutex for COMEDI core */
	struct rw_semaphore attach_lock;
	struct kref refcount;

	int n_subdevices;
	struct comedi_subdevice *subdevices;

	/* dumb */
	void __iomem *mmio;
	unsigned long iobase;
	unsigned long iolen;
	unsigned int irq;

	struct comedi_subdevice *read_subdev;
	struct comedi_subdevice *write_subdev;

	struct fasync_struct *async_queue;

	int (*open)(struct comedi_device *dev);
	void (*close)(struct comedi_device *dev);
	int (*insn_device_config)(struct comedi_device *dev,
				  struct comedi_insn *insn, unsigned int *data);
	unsigned int (*get_valid_routes)(struct comedi_device *dev,
					 unsigned int n_pairs,
					 unsigned int *pair_data);
};

/*
 * function prototypes
 */

void comedi_event(struct comedi_device *dev, struct comedi_subdevice *s);

struct comedi_device *comedi_dev_get_from_minor(unsigned int minor);
int comedi_dev_put(struct comedi_device *dev);

bool comedi_is_subdevice_running(struct comedi_subdevice *s);

void *comedi_alloc_spriv(struct comedi_subdevice *s, size_t size);
void comedi_set_spriv_auto_free(struct comedi_subdevice *s);

int comedi_check_chanlist(struct comedi_subdevice *s,
			  int n,
			  unsigned int *chanlist);

/* range stuff */

#define RANGE(a, b)		{(a) * 1e6, (b) * 1e6, 0}
#define RANGE_ext(a, b)		{(a) * 1e6, (b) * 1e6, RF_EXTERNAL}
#define RANGE_mA(a, b)		{(a) * 1e6, (b) * 1e6, UNIT_mA}
#define RANGE_unitless(a, b)	{(a) * 1e6, (b) * 1e6, 0}
#define BIP_RANGE(a)		{-(a) * 1e6, (a) * 1e6, 0}
#define UNI_RANGE(a)		{0, (a) * 1e6, 0}

extern const struct comedi_lrange range_bipolar10;
extern const struct comedi_lrange range_bipolar5;
extern const struct comedi_lrange range_bipolar2_5;
extern const struct comedi_lrange range_unipolar10;
extern const struct comedi_lrange range_unipolar5;
extern const struct comedi_lrange range_unipolar2_5;
extern const struct comedi_lrange range_0_20mA;
extern const struct comedi_lrange range_4_20mA;
extern const struct comedi_lrange range_0_32mA;
extern const struct comedi_lrange range_unknown;

#define range_digital		range_unipolar5

/**
 * struct comedi_lrange - Describes a COMEDI range table
 * @length: Number of entries in the range table.
 * @range: Array of &struct comedi_krange, one for each range.
 *
 * Each element of @range[] describes the minimum and maximum physical range
 * range and the type of units.  Typically, the type of unit is %UNIT_volt
 * (i.e. volts) and the minimum and maximum are in millionths of a volt.
 * There may also be a flag that indicates the minimum and maximum are merely
 * scale factors for an unknown, external reference.
 */
struct comedi_lrange {
	int length;
	struct comedi_krange range[];
};

/**
 * comedi_range_is_bipolar() - Test if subdevice range is bipolar
 * @s: COMEDI subdevice.
 * @range: Index of range within a range table.
 *
 * Tests whether a range is bipolar by checking whether its minimum value
 * is negative.
 *
 * Assumes @range is valid.  Does not work for subdevices using a
 * channel-specific range table list.
 *
 * Return:
 *	%true if the range is bipolar.
 *	%false if the range is unipolar.
 */
static inline bool comedi_range_is_bipolar(struct comedi_subdevice *s,
					   unsigned int range)
{
	return s->range_table->range[range].min < 0;
}

/**
 * comedi_range_is_unipolar() - Test if subdevice range is unipolar
 * @s: COMEDI subdevice.
 * @range: Index of range within a range table.
 *
 * Tests whether a range is unipolar by checking whether its minimum value
 * is at least 0.
 *
 * Assumes @range is valid.  Does not work for subdevices using a
 * channel-specific range table list.
 *
 * Return:
 *	%true if the range is unipolar.
 *	%false if the range is bipolar.
 */
static inline bool comedi_range_is_unipolar(struct comedi_subdevice *s,
					    unsigned int range)
{
	return s->range_table->range[range].min >= 0;
}

/**
 * comedi_range_is_external() - Test if subdevice range is external
 * @s: COMEDI subdevice.
 * @range: Index of range within a range table.
 *
 * Tests whether a range is externally reference by checking whether its
 * %RF_EXTERNAL flag is set.
 *
 * Assumes @range is valid.  Does not work for subdevices using a
 * channel-specific range table list.
 *
 * Return:
 *	%true if the range is external.
 *	%false if the range is internal.
 */
static inline bool comedi_range_is_external(struct comedi_subdevice *s,
					    unsigned int range)
{
	return !!(s->range_table->range[range].flags & RF_EXTERNAL);
}

/**
 * comedi_chan_range_is_bipolar() - Test if channel-specific range is bipolar
 * @s: COMEDI subdevice.
 * @chan: The channel number.
 * @range: Index of range within a range table.
 *
 * Tests whether a range is bipolar by checking whether its minimum value
 * is negative.
 *
 * Assumes @chan and @range are valid.  Only works for subdevices with a
 * channel-specific range table list.
 *
 * Return:
 *	%true if the range is bipolar.
 *	%false if the range is unipolar.
 */
static inline bool comedi_chan_range_is_bipolar(struct comedi_subdevice *s,
						unsigned int chan,
						unsigned int range)
{
	return s->range_table_list[chan]->range[range].min < 0;
}

/**
 * comedi_chan_range_is_unipolar() - Test if channel-specific range is unipolar
 * @s: COMEDI subdevice.
 * @chan: The channel number.
 * @range: Index of range within a range table.
 *
 * Tests whether a range is unipolar by checking whether its minimum value
 * is at least 0.
 *
 * Assumes @chan and @range are valid.  Only works for subdevices with a
 * channel-specific range table list.
 *
 * Return:
 *	%true if the range is unipolar.
 *	%false if the range is bipolar.
 */
static inline bool comedi_chan_range_is_unipolar(struct comedi_subdevice *s,
						 unsigned int chan,
						 unsigned int range)
{
	return s->range_table_list[chan]->range[range].min >= 0;
}

/**
 * comedi_chan_range_is_external() - Test if channel-specific range is external
 * @s: COMEDI subdevice.
 * @chan: The channel number.
 * @range: Index of range within a range table.
 *
 * Tests whether a range is externally reference by checking whether its
 * %RF_EXTERNAL flag is set.
 *
 * Assumes @chan and @range are valid.  Only works for subdevices with a
 * channel-specific range table list.
 *
 * Return:
 *	%true if the range is bipolar.
 *	%false if the range is unipolar.
 */
static inline bool comedi_chan_range_is_external(struct comedi_subdevice *s,
						 unsigned int chan,
						 unsigned int range)
{
	return !!(s->range_table_list[chan]->range[range].flags & RF_EXTERNAL);
}

/**
 * comedi_offset_munge() - Convert between offset binary and 2's complement
 * @s: COMEDI subdevice.
 * @val: Value to be converted.
 *
 * Toggles the highest bit of a sample value to toggle between offset binary
 * and 2's complement.  Assumes that @s->maxdata is a power of 2 minus 1.
 *
 * Return: The converted value.
 */
static inline unsigned int comedi_offset_munge(struct comedi_subdevice *s,
					       unsigned int val)
{
	return val ^ s->maxdata ^ (s->maxdata >> 1);
}

/**
 * comedi_bytes_per_sample() - Determine subdevice sample size
 * @s: COMEDI subdevice.
 *
 * The sample size will be 4 (sizeof int) or 2 (sizeof short) depending on
 * whether the %SDF_LSAMPL subdevice flag is set or not.
 *
 * Return: The subdevice sample size.
 */
static inline unsigned int comedi_bytes_per_sample(struct comedi_subdevice *s)
{
	return s->subdev_flags & SDF_LSAMPL ? sizeof(int) : sizeof(short);
}

/**
 * comedi_sample_shift() - Determine log2 of subdevice sample size
 * @s: COMEDI subdevice.
 *
 * The sample size will be 4 (sizeof int) or 2 (sizeof short) depending on
 * whether the %SDF_LSAMPL subdevice flag is set or not.  The log2 of the
 * sample size will be 2 or 1 and can be used as the right operand of a
 * bit-shift operator to multiply or divide something by the sample size.
 *
 * Return: log2 of the subdevice sample size.
 */
static inline unsigned int comedi_sample_shift(struct comedi_subdevice *s)
{
	return s->subdev_flags & SDF_LSAMPL ? 2 : 1;
}

/**
 * comedi_bytes_to_samples() - Convert a number of bytes to a number of samples
 * @s: COMEDI subdevice.
 * @nbytes: Number of bytes
 *
 * Return: The number of bytes divided by the subdevice sample size.
 */
static inline unsigned int comedi_bytes_to_samples(struct comedi_subdevice *s,
						   unsigned int nbytes)
{
	return nbytes >> comedi_sample_shift(s);
}

/**
 * comedi_samples_to_bytes() - Convert a number of samples to a number of bytes
 * @s: COMEDI subdevice.
 * @nsamples: Number of samples.
 *
 * Return: The number of samples multiplied by the subdevice sample size.
 * (Does not check for arithmetic overflow.)
 */
static inline unsigned int comedi_samples_to_bytes(struct comedi_subdevice *s,
						   unsigned int nsamples)
{
	return nsamples << comedi_sample_shift(s);
}

/**
 * comedi_check_trigger_src() - Trivially validate a comedi_cmd trigger source
 * @src: Pointer to the trigger source to validate.
 * @flags: Bitmask of valid %TRIG_* for the trigger.
 *
 * This is used in "step 1" of the do_cmdtest functions of comedi drivers
 * to validate the comedi_cmd triggers. The mask of the @src against the
 * @flags allows the userspace comedilib to pass all the comedi_cmd
 * triggers as %TRIG_ANY and get back a bitmask of the valid trigger sources.
 *
 * Return:
 *	0 if trigger sources in *@src are all supported.
 *	-EINVAL if any trigger source in *@src is unsupported.
 */
static inline int comedi_check_trigger_src(unsigned int *src,
					   unsigned int flags)
{
	unsigned int orig_src = *src;

	*src = orig_src & flags;
	if (*src == TRIG_INVALID || *src != orig_src)
		return -EINVAL;
	return 0;
}

/**
 * comedi_check_trigger_is_unique() - Make sure a trigger source is unique
 * @src: The trigger source to check.
 *
 * Return:
 *	0 if no more than one trigger source is set.
 *	-EINVAL if more than one trigger source is set.
 */
static inline int comedi_check_trigger_is_unique(unsigned int src)
{
	/* this test is true if more than one _src bit is set */
	if ((src & (src - 1)) != 0)
		return -EINVAL;
	return 0;
}

/**
 * comedi_check_trigger_arg_is() - Trivially validate a trigger argument
 * @arg: Pointer to the trigger arg to validate.
 * @val: The value the argument should be.
 *
 * Forces *@arg to be @val.
 *
 * Return:
 *	0 if *@arg was already @val.
 *	-EINVAL if *@arg differed from @val.
 */
static inline int comedi_check_trigger_arg_is(unsigned int *arg,
					      unsigned int val)
{
	if (*arg != val) {
		*arg = val;
		return -EINVAL;
	}
	return 0;
}

/**
 * comedi_check_trigger_arg_min() - Trivially validate a trigger argument min
 * @arg: Pointer to the trigger arg to validate.
 * @val: The minimum value the argument should be.
 *
 * Forces *@arg to be at least @val, setting it to @val if necessary.
 *
 * Return:
 *	0 if *@arg was already at least @val.
 *	-EINVAL if *@arg was less than @val.
 */
static inline int comedi_check_trigger_arg_min(unsigned int *arg,
					       unsigned int val)
{
	if (*arg < val) {
		*arg = val;
		return -EINVAL;
	}
	return 0;
}

/**
 * comedi_check_trigger_arg_max() - Trivially validate a trigger argument max
 * @arg: Pointer to the trigger arg to validate.
 * @val: The maximum value the argument should be.
 *
 * Forces *@arg to be no more than @val, setting it to @val if necessary.
 *
 * Return:
 *	0 if*@arg was already no more than @val.
 *	-EINVAL if *@arg was greater than @val.
 */
static inline int comedi_check_trigger_arg_max(unsigned int *arg,
					       unsigned int val)
{
	if (*arg > val) {
		*arg = val;
		return -EINVAL;
	}
	return 0;
}

/*
 * Must set dev->hw_dev if you wish to dma directly into comedi's buffer.
 * Also useful for retrieving a previously configured hardware device of
 * known bus type.  Set automatically for auto-configured devices.
 * Automatically set to NULL when detaching hardware device.
 */
int comedi_set_hw_dev(struct comedi_device *dev, struct device *hw_dev);

/**
 * comedi_buf_n_bytes_ready - Determine amount of unread data in buffer
 * @s: COMEDI subdevice.
 *
 * Determines the number of bytes of unread data in the asynchronous
 * acquisition data buffer for a subdevice.  The data in question might not
 * have been fully "munged" yet.
 *
 * Returns: The amount of unread data in bytes.
 */
static inline unsigned int comedi_buf_n_bytes_ready(struct comedi_subdevice *s)
{
	return s->async->buf_write_count - s->async->buf_read_count;
}

unsigned int comedi_buf_write_alloc(struct comedi_subdevice *s, unsigned int n);
unsigned int comedi_buf_write_free(struct comedi_subdevice *s, unsigned int n);

unsigned int comedi_buf_read_n_available(struct comedi_subdevice *s);
unsigned int comedi_buf_read_alloc(struct comedi_subdevice *s, unsigned int n);
unsigned int comedi_buf_read_free(struct comedi_subdevice *s, unsigned int n);

unsigned int comedi_buf_write_samples(struct comedi_subdevice *s,
				      const void *data, unsigned int nsamples);
unsigned int comedi_buf_read_samples(struct comedi_subdevice *s,
				     void *data, unsigned int nsamples);

/* drivers.c - general comedi driver functions */

#define COMEDI_TIMEOUT_MS	1000

int comedi_timeout(struct comedi_device *dev, struct comedi_subdevice *s,
		   struct comedi_insn *insn,
		   int (*cb)(struct comedi_device *dev,
			     struct comedi_subdevice *s,
			     struct comedi_insn *insn, unsigned long context),
		   unsigned long context);

unsigned int comedi_handle_events(struct comedi_device *dev,
				  struct comedi_subdevice *s);

int comedi_dio_insn_config(struct comedi_device *dev,
			   struct comedi_subdevice *s,
			   struct comedi_insn *insn, unsigned int *data,
			   unsigned int mask);
unsigned int comedi_dio_update_state(struct comedi_subdevice *s,
				     unsigned int *data);
unsigned int comedi_bytes_per_scan(struct comedi_subdevice *s);
unsigned int comedi_nscans_left(struct comedi_subdevice *s,
				unsigned int nscans);
unsigned int comedi_nsamples_left(struct comedi_subdevice *s,
				  unsigned int nsamples);
void comedi_inc_scan_progress(struct comedi_subdevice *s,
			      unsigned int num_bytes);

void *comedi_alloc_devpriv(struct comedi_device *dev, size_t size);
int comedi_alloc_subdevices(struct comedi_device *dev, int num_subdevices);
int comedi_alloc_subdev_readback(struct comedi_subdevice *s);

int comedi_readback_insn_read(struct comedi_device *dev,
			      struct comedi_subdevice *s,
			      struct comedi_insn *insn, unsigned int *data);

int comedi_load_firmware(struct comedi_device *dev, struct device *hw_dev,
			 const char *name,
			 int (*cb)(struct comedi_device *dev,
				   const u8 *data, size_t size,
				   unsigned long context),
			 unsigned long context);

int __comedi_request_region(struct comedi_device *dev,
			    unsigned long start, unsigned long len);
int comedi_request_region(struct comedi_device *dev,
			  unsigned long start, unsigned long len);
void comedi_legacy_detach(struct comedi_device *dev);

int comedi_auto_config(struct device *hardware_device,
		       struct comedi_driver *driver, unsigned long context);
void comedi_auto_unconfig(struct device *hardware_device);

int comedi_driver_register(struct comedi_driver *driver);
void comedi_driver_unregister(struct comedi_driver *driver);

/**
 * module_comedi_driver() - Helper macro for registering a comedi driver
 * @__comedi_driver: comedi_driver struct
 *
 * Helper macro for comedi drivers which do not do anything special in module
 * init/exit. This eliminates a lot of boilerplate. Each module may only use
 * this macro once, and calling it replaces module_init() and module_exit().
 */
#define module_comedi_driver(__comedi_driver) \
	module_driver(__comedi_driver, comedi_driver_register, \
			comedi_driver_unregister)

#endif /* _COMEDIDEV_H */