summaryrefslogtreecommitdiff
path: root/drivers/staging/comedi/comedidev.h
blob: 4eb2b77f56dc55ef9442e00935094a630742318b (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
/*
    include/linux/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>

    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.

*/

#ifndef _COMEDIDEV_H
#define _COMEDIDEV_H

#include <linux/kernel.h>
#include <linux/module.h>
#include <linux/kdev_t.h>
#include <linux/slab.h>
#include <linux/delay.h>
#include <linux/errno.h>
#include <linux/spinlock.h>
#include <linux/mutex.h>
#include <linux/wait.h>
#include <linux/mm.h>
#include <linux/init.h>
#include <linux/vmalloc.h>
#include <linux/dma-mapping.h>
#include <linux/uaccess.h>
#include <linux/io.h>
#include <linux/timer.h>

#include "comedi.h"

#define DPRINTK(format, args...)	do {		\
	if (comedi_debug)				\
		printk(KERN_DEBUG "comedi: " format , ## args);	\
} while (0)

#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_INITCLEANUP_NOMODULE(x)					\
	static int __init x ## _init_module(void)			\
		{return comedi_driver_register(&(x)); }			\
	static void __exit x ## _cleanup_module(void)			\
		{comedi_driver_unregister(&(x)); }			\
	module_init(x ## _init_module);					\
	module_exit(x ## _cleanup_module);

#define COMEDI_MODULE_MACROS						\
	MODULE_AUTHOR("Comedi http://www.comedi.org");		\
	MODULE_DESCRIPTION("Comedi low-level driver");			\
	MODULE_LICENSE("GPL");

#define COMEDI_INITCLEANUP(x)						\
	COMEDI_MODULE_MACROS		\
	COMEDI_INITCLEANUP_NOMODULE(x)

#define COMEDI_PCI_INITCLEANUP_NOMODULE(comedi_driver, pci_id_table) \
	static int __devinit comedi_driver ## _pci_probe(struct pci_dev *dev, \
		const struct pci_device_id *ent) \
	{ \
		return comedi_pci_auto_config(dev, comedi_driver.driver_name); \
	} \
	static void __devexit comedi_driver ## _pci_remove(\
		struct pci_dev *dev) \
	{ \
		comedi_pci_auto_unconfig(dev); \
	} \
	static struct pci_driver comedi_driver ## _pci_driver = \
	{ \
		.id_table = pci_id_table, \
		.probe = &comedi_driver ## _pci_probe, \
		.remove = __devexit_p(&comedi_driver ## _pci_remove) \
	}; \
	static int __init comedi_driver ## _init_module(void) \
	{ \
		int retval; \
		retval = comedi_driver_register(&comedi_driver); \
		if (retval < 0) \
			return retval; \
			comedi_driver ## _pci_driver.name = \
				(char *)comedi_driver.driver_name; \
		return pci_register_driver(&comedi_driver ## _pci_driver); \
	} \
	static void __exit comedi_driver ## _cleanup_module(void) \
	{ \
		pci_unregister_driver(&comedi_driver ## _pci_driver); \
		comedi_driver_unregister(&comedi_driver); \
	} \
	module_init(comedi_driver ## _init_module); \
	module_exit(comedi_driver ## _cleanup_module);

#define COMEDI_PCI_INITCLEANUP(comedi_driver, pci_id_table) \
	COMEDI_MODULE_MACROS \
	COMEDI_PCI_INITCLEANUP_NOMODULE(comedi_driver, pci_id_table)

#define PCI_VENDOR_ID_ADLINK		0x144a
#define PCI_VENDOR_ID_ICP		0x104c
#define PCI_VENDOR_ID_CONTEC		0x1221

#define COMEDI_NUM_MINORS 0x100
#define COMEDI_NUM_BOARD_MINORS 0x30
#define COMEDI_FIRST_SUBDEVICE_MINOR COMEDI_NUM_BOARD_MINORS

#define COMEDI_DEVICE_CREATE(cs, parent, devt, drvdata, device, fmt...) \
	device_create(cs, ((parent) ? (parent) : (device)), devt, drvdata, fmt)

struct comedi_subdevice {
	struct comedi_device *device;
	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 runflags;
	spinlock_t spin_lock;

	int io_bits;

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

	unsigned int flags;
	const unsigned int *flaglist;

	unsigned int settling_time_0;

	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 *, struct comedi_subdevice *,
			  struct comedi_insn *, unsigned int *);
	int (*insn_write) (struct comedi_device *, struct comedi_subdevice *,
			   struct comedi_insn *, unsigned int *);
	int (*insn_bits) (struct comedi_device *, struct comedi_subdevice *,
			  struct comedi_insn *, unsigned int *);
	int (*insn_config) (struct comedi_device *, struct comedi_subdevice *,
			    struct comedi_insn *, unsigned int *);

	int (*do_cmd) (struct comedi_device *, struct comedi_subdevice *);
	int (*do_cmdtest) (struct comedi_device *, struct comedi_subdevice *,
			   struct comedi_cmd *);
	int (*poll) (struct comedi_device *, struct comedi_subdevice *);
	int (*cancel) (struct comedi_device *, struct comedi_subdevice *);
	/* int (*do_lock)(struct comedi_device *, struct comedi_subdevice *); */
	/* int (*do_unlock)(struct comedi_device *, \
			struct comedi_subdevice *); */

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

	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;
};

struct comedi_buf_page {
	void *virt_addr;
	dma_addr_t dma_addr;
};

struct comedi_async {
	struct comedi_subdevice *subdevice;

	void *prealloc_buf;	/* pre-allocated buffer */
	unsigned int prealloc_bufsz;	/* buffer size, in bytes */
	/* virtual and dma address of each page */
	struct comedi_buf_page *buf_page_list;
	unsigned n_buf_pages;	/* num elements in buf_page_list */

	unsigned int max_bufsize;	/* maximum buffer size, bytes */
	/* current number of mmaps of prealloc_buf */
	unsigned int mmap_count;

	/* byte count for writer (write completed) */
	unsigned int buf_write_count;
	/* byte count for writer (allocated for writing) */
	unsigned int buf_write_alloc_count;
	/* byte count for reader (read completed) */
	unsigned int buf_read_count;
	/* byte count for reader (allocated for reading) */
	unsigned int buf_read_alloc_count;

	unsigned int buf_write_ptr;	/* buffer marker for writer */
	unsigned int buf_read_ptr;	/* buffer marker for reader */

	unsigned int cur_chan;	/* useless channel marker for interrupt */
	/* number of bytes that have been received for current scan */
	unsigned int scan_progress;
	/* keeps track of where we are in chanlist as for munging */
	unsigned int munge_chan;
	/* number of bytes that have been munged */
	unsigned int munge_count;
	/* buffer marker for munging */
	unsigned int munge_ptr;

	unsigned int events;	/* events that have occurred */

	struct comedi_cmd cmd;

	wait_queue_head_t wait_head;

	/* callback stuff */
	unsigned int cb_mask;
	int (*cb_func) (unsigned int flags, void *);
	void *cb_arg;

	int (*inttrig) (struct comedi_device *dev, struct comedi_subdevice *s,
			unsigned int x);
};

struct comedi_driver {
	struct comedi_driver *next;

	const char *driver_name;
	struct module *module;
	int (*attach) (struct comedi_device *, struct comedi_devconfig *);
	int (*detach) (struct comedi_device *);

	/* number of elements in board_name and board_id arrays */
	unsigned int num_names;
	const char *const *board_name;
	/* offset in bytes from one board name pointer to the next */
	int offset;
};

struct comedi_device {
	int use_count;
	struct comedi_driver *driver;
	void *private;

	struct device *class_dev;
	int minor;
	/* hw_dev is passed to dma_alloc_coherent when allocating async buffers
	 * for subdevices that have async_dma_dir set to something other than
	 * DMA_NONE */
	struct device *hw_dev;

	const char *board_name;
	const void *board_ptr;
	int attached;
	spinlock_t spinlock;
	struct mutex mutex;
	int in_request_module;

	int n_subdevices;
	struct comedi_subdevice *subdevices;

	/* dumb */
	unsigned long iobase;
	unsigned int irq;

	struct comedi_subdevice *read_subdev;
	struct comedi_subdevice *write_subdev;

	struct fasync_struct *async_queue;

	void (*open) (struct comedi_device *dev);
	void (*close) (struct comedi_device *dev);
};

struct comedi_device_file_info {
	struct comedi_device *device;
	struct comedi_subdevice *read_subdevice;
	struct comedi_subdevice *write_subdevice;
};

#ifdef CONFIG_COMEDI_DEBUG
extern int comedi_debug;
#else
static const int comedi_debug;
#endif

/*
 * function prototypes
 */

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

/* we can expand the number of bits used to encode devices/subdevices into
 the minor number soon, after more distros support > 8 bit minor numbers
 (like after Debian Etch gets released) */
enum comedi_minor_bits {
	COMEDI_DEVICE_MINOR_MASK = 0xf,
	COMEDI_SUBDEVICE_MINOR_MASK = 0xf0
};
static const unsigned COMEDI_SUBDEVICE_MINOR_SHIFT = 4;
static const unsigned COMEDI_SUBDEVICE_MINOR_OFFSET = 1;

struct comedi_device_file_info *comedi_get_device_file_info(unsigned minor);

static inline struct comedi_subdevice *comedi_get_read_subdevice(
	const struct comedi_device_file_info *info)
{
	if (info->read_subdevice)
		return info->read_subdevice;
	if (info->device == NULL)
		return NULL;
	return info->device->read_subdev;
}

static inline struct comedi_subdevice *comedi_get_write_subdevice(
	const struct comedi_device_file_info *info)
{
	if (info->write_subdevice)
		return info->write_subdevice;
	if (info->device == NULL)
		return NULL;
	return info->device->write_subdev;
}

void comedi_device_detach(struct comedi_device *dev);
int comedi_device_attach(struct comedi_device *dev,
			 struct comedi_devconfig *it);
int comedi_driver_register(struct comedi_driver *);
int comedi_driver_unregister(struct comedi_driver *);

void init_polling(void);
void cleanup_polling(void);
void start_polling(struct comedi_device *);
void stop_polling(struct comedi_device *);

#ifdef CONFIG_PROC_FS
void comedi_proc_init(void);
void comedi_proc_cleanup(void);
#else
static inline void comedi_proc_init(void)
{
}

static inline void comedi_proc_cleanup(void)
{
}
#endif

/* subdevice runflags */
enum subdevice_runflags {
	SRF_USER = 0x00000001,
	SRF_RT = 0x00000002,
	/* indicates an COMEDI_CB_ERROR event has occurred since the last
	 * command was started */
	SRF_ERROR = 0x00000004,
	SRF_RUNNING = 0x08000000
};

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

/* 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_unknown;

#define range_digital		range_unipolar5

#if __GNUC__ >= 3
#define GCC_ZERO_LENGTH_ARRAY
#else
#define GCC_ZERO_LENGTH_ARRAY 0
#endif

struct comedi_lrange {
	int length;
	struct comedi_krange range[GCC_ZERO_LENGTH_ARRAY];
};

/* some silly little inline functions */

static inline int alloc_subdevices(struct comedi_device *dev,
				   unsigned int num_subdevices)
{
	unsigned i;

	dev->n_subdevices = num_subdevices;
	dev->subdevices =
	    kcalloc(num_subdevices, sizeof(struct comedi_subdevice),
		    GFP_KERNEL);
	if (!dev->subdevices)
		return -ENOMEM;
	for (i = 0; i < num_subdevices; ++i) {
		dev->subdevices[i].device = dev;
		dev->subdevices[i].async_dma_dir = DMA_NONE;
		spin_lock_init(&dev->subdevices[i].spin_lock);
		dev->subdevices[i].minor = -1;
	}
	return 0;
}

static inline int alloc_private(struct comedi_device *dev, int size)
{
	dev->private = kzalloc(size, GFP_KERNEL);
	if (!dev->private)
		return -ENOMEM;
	return 0;
}

static inline unsigned int bytes_per_sample(const struct comedi_subdevice *subd)
{
	if (subd->subdev_flags & SDF_LSAMPL)
		return sizeof(unsigned int);
	else
		return sizeof(short);
}

/* must be used in attach to set dev->hw_dev if you wish to dma directly
into comedi's buffer */
static inline void comedi_set_hw_dev(struct comedi_device *dev,
				     struct device *hw_dev)
{
	if (dev->hw_dev)
		put_device(dev->hw_dev);

	dev->hw_dev = hw_dev;
	if (dev->hw_dev) {
		dev->hw_dev = get_device(dev->hw_dev);
		BUG_ON(dev->hw_dev == NULL);
	}
}

int comedi_buf_put(struct comedi_async *async, short x);
int comedi_buf_get(struct comedi_async *async, short *x);

unsigned int comedi_buf_write_n_available(struct comedi_async *async);
unsigned int comedi_buf_write_alloc(struct comedi_async *async,
				    unsigned int nbytes);
unsigned int comedi_buf_write_alloc_strict(struct comedi_async *async,
					   unsigned int nbytes);
unsigned comedi_buf_write_free(struct comedi_async *async, unsigned int nbytes);
unsigned comedi_buf_read_alloc(struct comedi_async *async, unsigned nbytes);
unsigned comedi_buf_read_free(struct comedi_async *async, unsigned int nbytes);
unsigned int comedi_buf_read_n_available(struct comedi_async *async);
void comedi_buf_memcpy_to(struct comedi_async *async, unsigned int offset,
			  const void *source, unsigned int num_bytes);
void comedi_buf_memcpy_from(struct comedi_async *async, unsigned int offset,
			    void *destination, unsigned int num_bytes);
static inline unsigned comedi_buf_write_n_allocated(struct comedi_async *async)
{
	return async->buf_write_alloc_count - async->buf_write_count;
}

static inline unsigned comedi_buf_read_n_allocated(struct comedi_async *async)
{
	return async->buf_read_alloc_count - async->buf_read_count;
}

static inline void *comedi_aux_data(int options[], int n)
{
	unsigned long address;
	unsigned long addressLow;
	int bit_shift;
	if (sizeof(int) >= sizeof(void *))
		address = options[COMEDI_DEVCONF_AUX_DATA_LO];
	else {
		address = options[COMEDI_DEVCONF_AUX_DATA_HI];
		bit_shift = sizeof(int) * 8;
		address <<= bit_shift;
		addressLow = options[COMEDI_DEVCONF_AUX_DATA_LO];
		addressLow &= (1UL << bit_shift) - 1;
		address |= addressLow;
	}
	if (n >= 1)
		address += options[COMEDI_DEVCONF_AUX_DATA0_LENGTH];
	if (n >= 2)
		address += options[COMEDI_DEVCONF_AUX_DATA1_LENGTH];
	if (n >= 3)
		address += options[COMEDI_DEVCONF_AUX_DATA2_LENGTH];
	BUG_ON(n > 3);
	return (void *)address;
}

int comedi_alloc_subdevice_minor(struct comedi_device *dev,
				 struct comedi_subdevice *s);
void comedi_free_subdevice_minor(struct comedi_subdevice *s);
int comedi_pci_auto_config(struct pci_dev *pcidev, const char *board_name);
void comedi_pci_auto_unconfig(struct pci_dev *pcidev);
struct usb_device;		/* forward declaration */
int comedi_usb_auto_config(struct usb_device *usbdev, const char *board_name);
void comedi_usb_auto_unconfig(struct usb_device *usbdev);

#ifdef CONFIG_COMEDI_PCI_DRIVERS
#define CONFIG_COMEDI_PCI
#endif
#ifdef CONFIG_COMEDI_PCI_DRIVERS_MODULE
#define CONFIG_COMEDI_PCI
#endif
#ifdef CONFIG_COMEDI_PCMCIA_DRIVERS
#define CONFIG_COMEDI_PCMCIA
#endif
#ifdef CONFIG_COMEDI_PCMCIA_DRIVERS_MODULE
#define CONFIG_COMEDI_PCMCIA
#endif

#endif /* _COMEDIDEV_H */