Bootlin logo

Elixir Cross Referencer

  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
/*****************************************************************************
*                                                                            *
*  easycap.h                                                                 *
*                                                                            *
*****************************************************************************/
/*
 *
 *  Copyright (C) 2010 R.M. Thomas  <rmthomas@sciolus.org>
 *
 *
 *  This 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.
 *
 *  The software 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 software; if not, write to the Free Software
 *  Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA  02111-1307  USA
 *
*/
/*****************************************************************************/
/*---------------------------------------------------------------------------*/
/*
 *  THE FOLLOWING PARAMETERS ARE UNDEFINED:
 *
 *                EASYCAP_DEBUG
 *
 *  IF REQUIRED THEY MUST BE EXTERNALLY DEFINED, FOR EXAMPLE AS COMPILER
 *  OPTIONS.
 */
/*---------------------------------------------------------------------------*/

#ifndef __EASYCAP_H__
#define __EASYCAP_H__

/*---------------------------------------------------------------------------*/
/*
 *  THESE ARE NORMALLY DEFINED
 */
/*---------------------------------------------------------------------------*/
#define  PATIENCE  500
#define  PERSEVERE
/*---------------------------------------------------------------------------*/
/*
 *  THESE ARE FOR MAINTENANCE ONLY - NORMALLY UNDEFINED:
 */
/*---------------------------------------------------------------------------*/
#undef  EASYCAP_TESTCARD
/*---------------------------------------------------------------------------*/
#include <linux/kernel.h>
#include <linux/errno.h>
#include <linux/init.h>
#include <linux/slab.h>
#include <linux/module.h>
#include <linux/kref.h>
#include <linux/usb.h>
#include <linux/uaccess.h>

#include <linux/i2c.h>
#include <linux/version.h>
#include <linux/workqueue.h>
#include <linux/poll.h>
#include <linux/mm.h>
#include <linux/fs.h>
#include <linux/delay.h>
#include <linux/types.h>

#ifndef CONFIG_EASYCAP_OSS
#include <linux/vmalloc.h>
#include <linux/sound.h>
#include <sound/core.h>
#include <sound/pcm.h>
#include <sound/pcm_params.h>
#include <sound/info.h>
#include <sound/initval.h>
#include <sound/control.h>
#endif /* !CONFIG_EASYCAP_OSS */
#include <media/v4l2-dev.h>
#include <media/v4l2-device.h>
#include <linux/videodev2.h>
#include <linux/soundcard.h>

#ifndef PAGE_SIZE
#error "PAGE_SIZE not defined"
#endif /* PAGE_SIZE */

/*---------------------------------------------------------------------------*/
/*  VENDOR, PRODUCT:  Syntek Semiconductor Co., Ltd
 *
 *      EITHER        EasyCAP USB 2.0 Video Adapter with Audio, Model No. DC60
 *               with input cabling:  AUDIO(L), AUDIO(R), CVBS, S-VIDEO.
 *
 *          OR        EasyCAP 4CHANNEL USB 2.0 DVR, Model No. EasyCAP002
 *               with input cabling:  MICROPHONE, CVBS1, CVBS2, CVBS3, CVBS4.
 */
/*---------------------------------------------------------------------------*/
#define USB_EASYCAP_VENDOR_ID	0x05e1
#define USB_EASYCAP_PRODUCT_ID	0x0408

#define EASYCAP_DRIVER_VERSION "0.9.01"
#define EASYCAP_DRIVER_DESCRIPTION "easycapdc60"

#define USB_SKEL_MINOR_BASE     192
#define DONGLE_MANY 8
#define INPUT_MANY 6
/*---------------------------------------------------------------------------*/
/*
 *  DEFAULT LUMINANCE, CONTRAST, SATURATION AND HUE
 */
/*---------------------------------------------------------------------------*/
#define SAA_0A_DEFAULT 0x7F
#define SAA_0B_DEFAULT 0x3F
#define SAA_0C_DEFAULT 0x2F
#define SAA_0D_DEFAULT 0x00
/*---------------------------------------------------------------------------*/
/*
 *  VIDEO STREAMING PARAMETERS:
 *  USB 2.0 PROVIDES FOR HIGH-BANDWIDTH ENDPOINTS WITH AN UPPER LIMIT
 *  OF 3072 BYTES PER MICROFRAME for wMaxPacketSize.
 */
/*---------------------------------------------------------------------------*/
#define VIDEO_ISOC_BUFFER_MANY 16
#define VIDEO_ISOC_ORDER 3
#define VIDEO_ISOC_FRAMESPERDESC ((unsigned int) 1 << VIDEO_ISOC_ORDER)
#define USB_2_0_MAXPACKETSIZE 3072
#if (USB_2_0_MAXPACKETSIZE > PAGE_SIZE)
#error video_isoc_buffer[.] will not be big enough
#endif
#define VIDEO_JUNK_TOLERATE VIDEO_ISOC_BUFFER_MANY
#define VIDEO_LOST_TOLERATE 50
/*---------------------------------------------------------------------------*/
/*
 *  VIDEO BUFFERS
 */
/*---------------------------------------------------------------------------*/
#define FIELD_BUFFER_SIZE (203 * PAGE_SIZE)
#define FRAME_BUFFER_SIZE (405 * PAGE_SIZE)
#define FIELD_BUFFER_MANY 4
#define FRAME_BUFFER_MANY 6
/*---------------------------------------------------------------------------*/
/*
 *  AUDIO STREAMING PARAMETERS
 */
/*---------------------------------------------------------------------------*/
#define AUDIO_ISOC_BUFFER_MANY 16
#define AUDIO_ISOC_ORDER 1
#define AUDIO_ISOC_FRAMESPERDESC 32
#define AUDIO_ISOC_BUFFER_SIZE (PAGE_SIZE << AUDIO_ISOC_ORDER)
/*---------------------------------------------------------------------------*/
/*
 *  AUDIO BUFFERS
 */
/*---------------------------------------------------------------------------*/
#define AUDIO_FRAGMENT_MANY 32
#define PAGES_PER_AUDIO_FRAGMENT 4
/*---------------------------------------------------------------------------*/
/*
 *  IT IS ESSENTIAL THAT EVEN-NUMBERED STANDARDS ARE 25 FRAMES PER SECOND,
 *                        ODD-NUMBERED STANDARDS ARE 30 FRAMES PER SECOND.
 *  THE NUMBERING OF STANDARDS MUST NOT BE CHANGED WITHOUT DUE CARE.  NOT
 *  ONLY MUST THE PARAMETER
 *                             STANDARD_MANY
 *  BE CHANGED TO CORRESPOND TO THE NEW NUMBER OF STANDARDS, BUT ALSO THE
 *  NUMBERING MUST REMAIN AN UNBROKEN ASCENDING SEQUENCE:  DUMMY STANDARDS
 *  MAY NEED TO BE ADDED.   APPROPRIATE CHANGES WILL ALWAYS BE REQUIRED IN
 *  ROUTINE fillin_formats() AND POSSIBLY ELSEWHERE.  BEWARE.
 */
/*---------------------------------------------------------------------------*/
#define  PAL_BGHIN      0
#define  PAL_Nc         2
#define  SECAM          4
#define  NTSC_N         6
#define  NTSC_N_443     8
#define  NTSC_M         1
#define  NTSC_443       3
#define  NTSC_M_JP      5
#define  PAL_60         7
#define  PAL_M          9
#define  PAL_BGHIN_SLOW    10
#define  PAL_Nc_SLOW       12
#define  SECAM_SLOW        14
#define  NTSC_N_SLOW       16
#define  NTSC_N_443_SLOW   18
#define  NTSC_M_SLOW       11
#define  NTSC_443_SLOW     13
#define  NTSC_M_JP_SLOW    15
#define  PAL_60_SLOW       17
#define  PAL_M_SLOW        19
#define  STANDARD_MANY 20
/*---------------------------------------------------------------------------*/
/*
 *  ENUMS
 */
/*---------------------------------------------------------------------------*/
enum {
	AT_720x576,
	AT_704x576,
	AT_640x480,
	AT_720x480,
	AT_360x288,
	AT_320x240,
	AT_360x240,
	RESOLUTION_MANY
};
enum {
	FMT_UYVY,
	FMT_YUY2,
	FMT_RGB24,
	FMT_RGB32,
	FMT_BGR24,
	FMT_BGR32,
	PIXELFORMAT_MANY
};
enum {
	FIELD_NONE,
	FIELD_INTERLACED,
	INTERLACE_MANY
};
#define SETTINGS_MANY	(STANDARD_MANY * \
			RESOLUTION_MANY * \
			2 * \
			PIXELFORMAT_MANY * \
			INTERLACE_MANY)
/*---------------------------------------------------------------------------*/
/*
 *  STRUCTURE DEFINITIONS
 */
/*---------------------------------------------------------------------------*/
struct easycap_dongle {
	struct easycap *peasycap;
	struct mutex mutex_video;
	struct mutex mutex_audio;
};
/*---------------------------------------------------------------------------*/
struct data_buffer {
	struct list_head list_head;
	void *pgo;
	void *pto;
	u16 kount;
	u16 input;
};
/*---------------------------------------------------------------------------*/
struct data_urb {
	struct list_head list_head;
	struct urb *purb;
	int isbuf;
	int length;
};
/*---------------------------------------------------------------------------*/
struct easycap_standard {
	u16 mask;
struct v4l2_standard v4l2_standard;
};
struct easycap_format {
	u16 mask;
	char name[128];
struct v4l2_format v4l2_format;
};
struct inputset {
	int input;
	int input_ok;
	int standard_offset;
	int standard_offset_ok;
	int format_offset;
	int format_offset_ok;
	int brightness;
	int brightness_ok;
	int contrast;
	int contrast_ok;
	int saturation;
	int saturation_ok;
	int hue;
	int hue_ok;
};
/*---------------------------------------------------------------------------*/
/*
 *   easycap.ilk == 0   =>  CVBS+S-VIDEO HARDWARE, AUDIO wMaxPacketSize=256
 *   easycap.ilk == 2   =>  CVBS+S-VIDEO HARDWARE, AUDIO wMaxPacketSize=9
 *   easycap.ilk == 3   =>     FOUR-CVBS HARDWARE, AUDIO wMaxPacketSize=9
 */
/*---------------------------------------------------------------------------*/
struct easycap {
#define TELLTALE "expectedstring"
	char telltale[16];
	int isdongle;
	int minor;

	struct video_device video_device;
	struct v4l2_device v4l2_device;

	int status;
	unsigned int audio_pages_per_fragment;
	unsigned int audio_bytes_per_fragment;
	unsigned int audio_buffer_page_many;

#define UPSAMPLE
#ifdef UPSAMPLE
	s16 oldaudio;
#endif /*UPSAMPLE*/

	int ilk;
	bool microphone;

	struct usb_device *pusb_device;
	struct usb_interface *pusb_interface;

	struct kref kref;

	int queued[FRAME_BUFFER_MANY];
	int done[FRAME_BUFFER_MANY];

	wait_queue_head_t wq_video;
	wait_queue_head_t wq_audio;
	wait_queue_head_t wq_trigger;

	int input;
	int polled;
	int standard_offset;
	int format_offset;
	struct inputset inputset[INPUT_MANY];

	bool ntsc;
	int fps;
	int usec;
	int tolerate;
	int skip;
	int skipped;
	int lost[INPUT_MANY];
	int merit[180];

	struct timeval timeval0;
	struct timeval timeval1;
	struct timeval timeval2;
	struct timeval timeval3;
	struct timeval timeval6;
	struct timeval timeval7;
	struct timeval timeval8;
	long long int dnbydt;

	int    video_interface;
	int    video_altsetting_on;
	int    video_altsetting_off;
	int    video_endpointnumber;
	int    video_isoc_maxframesize;
	int    video_isoc_buffer_size;
	int    video_isoc_framesperdesc;

	int    video_isoc_streaming;
	int    video_isoc_sequence;
	int    video_idle;
	int    video_eof;
	int    video_junk;

	struct data_buffer video_isoc_buffer[VIDEO_ISOC_BUFFER_MANY];
	struct data_buffer field_buffer[FIELD_BUFFER_MANY]
					[(FIELD_BUFFER_SIZE/PAGE_SIZE)];
	struct data_buffer frame_buffer[FRAME_BUFFER_MANY]
					[(FRAME_BUFFER_SIZE/PAGE_SIZE)];

	struct list_head urb_video_head;
	struct list_head *purb_video_head;

	u8 cache[8];
	u8 *pcache;
	int video_mt;
	int audio_mt;
	long long audio_bytes;
	u32 isequence;

	int vma_many;
/*---------------------------------------------------------------------------*/
/*
 *  BUFFER INDICATORS
 */
/*---------------------------------------------------------------------------*/
	int field_fill;	/* Field buffer being filled by easycap_complete().  */
			/*   Bumped only by easycap_complete().              */
	int field_page;	/* Page of field buffer page being filled by         */
			/*   easycap_complete().                             */
	int field_read;	/* Field buffer to be read by field2frame().         */
			/*   Bumped only by easycap_complete().              */
	int frame_fill;	/* Frame buffer being filled by field2frame().       */
			/*   Bumped only by easycap_dqbuf() when             */
			/*   field2frame() has created a complete frame.     */
	int frame_read;	/* Frame buffer offered to user by DQBUF.            */
			/*   Set only by easycap_dqbuf() to trail frame_fill.*/
	int frame_lock;	/* Flag set to 1 by DQBUF and cleared by QBUF        */
/*---------------------------------------------------------------------------*/
/*
 *  IMAGE PROPERTIES
 */
/*---------------------------------------------------------------------------*/
	u32                   pixelformat;
	int                     width;
	int                     height;
	int                     bytesperpixel;
	bool                    byteswaporder;
	bool                    decimatepixel;
	bool                    offerfields;
	int                     frame_buffer_used;
	int                     frame_buffer_many;
	int                     videofieldamount;

	int                     brightness;
	int                     contrast;
	int                     saturation;
	int                     hue;

	int allocation_video_urb;
	int allocation_video_page;
	int allocation_video_struct;
	int registered_video;
/*---------------------------------------------------------------------------*/
/*
 *  ALSA
 */
/*---------------------------------------------------------------------------*/
#ifndef CONFIG_EASYCAP_OSS
	struct snd_pcm_hardware alsa_hardware;
	struct snd_card *psnd_card;
	struct snd_pcm *psnd_pcm;
	struct snd_pcm_substream *psubstream;
	int dma_fill;
	int dma_next;
	int dma_read;
#endif /* !CONFIG_EASYCAP_OSS */
/*---------------------------------------------------------------------------*/
/*
 *  SOUND PROPERTIES
 */
/*---------------------------------------------------------------------------*/
	int audio_interface;
	int audio_altsetting_on;
	int audio_altsetting_off;
	int audio_endpointnumber;
	int audio_isoc_maxframesize;
	int audio_isoc_buffer_size;
	int audio_isoc_framesperdesc;

	int audio_isoc_streaming;
	int audio_idle;
	int audio_eof;
	int volume;
	int mute;
	s8 gain;

	struct data_buffer audio_isoc_buffer[AUDIO_ISOC_BUFFER_MANY];

	struct list_head urb_audio_head;
	struct list_head *purb_audio_head;
/*---------------------------------------------------------------------------*/
/*
 *  BUFFER INDICATORS
 */
/*---------------------------------------------------------------------------*/
	int audio_fill;	/* Audio buffer being filled by easycap_complete().  */
			/*   Bumped only by easycap_complete().              */
	int audio_read;	/* Audio buffer page being read by easycap_read().   */
			/*   Set by easycap_read() to trail audio_fill by    */
			/*   one fragment.                                   */
/*---------------------------------------------------------------------------*/
/*
 *  SOUND PROPERTIES
 */
/*---------------------------------------------------------------------------*/

	int audio_buffer_many;

	int allocation_audio_urb;
	int allocation_audio_page;
	int allocation_audio_struct;
	int registered_audio;

	long long int audio_sample;
	long long int audio_niveau;
	long long int audio_square;

	struct data_buffer audio_buffer[];
};
/*---------------------------------------------------------------------------*/
/*
 *  VIDEO FUNCTION PROTOTYPES
 */
/*^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^*/
long easycap_unlocked_ioctl(struct file *, unsigned int, unsigned long);
int              easycap_dqbuf(struct easycap *, int);
int              submit_video_urbs(struct easycap *);
int              kill_video_urbs(struct easycap *);
int              field2frame(struct easycap *);
int              redaub(struct easycap *, void *, void *,
						int, int, u8, u8, bool);
void             easycap_testcard(struct easycap *, int);
int              fillin_formats(void);
int              newinput(struct easycap *, int);
int              adjust_standard(struct easycap *, v4l2_std_id);
int              adjust_format(struct easycap *, u32, u32, u32,
								int, bool);
int              adjust_brightness(struct easycap *, int);
int              adjust_contrast(struct easycap *, int);
int              adjust_saturation(struct easycap *, int);
int              adjust_hue(struct easycap *, int);
int              adjust_volume(struct easycap *, int);
/*---------------------------------------------------------------------------*/
/*
 *  AUDIO FUNCTION PROTOTYPES
 */
/*---------------------------------------------------------------------------*/
#ifndef CONFIG_EASYCAP_OSS
int		easycap_alsa_probe(struct easycap *);
void            easycap_alsa_complete(struct urb *);
#else /* CONFIG_EASYCAP_OSS */
void             easyoss_complete(struct urb *);
#endif /* !CONFIG_EASYCAP_OSS */

int              easycap_sound_setup(struct easycap *);
int              submit_audio_urbs(struct easycap *);
int              kill_audio_urbs(struct easycap *);
void             easyoss_testtone(struct easycap *, int);
int              audio_setup(struct easycap *);
/*---------------------------------------------------------------------------*/
/*
 *  LOW-LEVEL FUNCTION PROTOTYPES
 */
/*---------------------------------------------------------------------------*/
int              audio_gainget(struct usb_device *);
int              audio_gainset(struct usb_device *, s8);

int              set_interface(struct usb_device *, u16);
int              wakeup_device(struct usb_device *);
int              confirm_resolution(struct usb_device *);
int              confirm_stream(struct usb_device *);

int              setup_stk(struct usb_device *, bool);
int              setup_saa(struct usb_device *, bool);
int              setup_vt(struct usb_device *);
int              check_stk(struct usb_device *, bool);
int              check_saa(struct usb_device *, bool);
int              ready_saa(struct usb_device *);
int              merit_saa(struct usb_device *);
int              check_vt(struct usb_device *);
int              select_input(struct usb_device *, int, int);
int              set_resolution(struct usb_device *,
						u16, u16, u16, u16);

int              read_saa(struct usb_device *, u16);
int              read_stk(struct usb_device *, u32);
int              write_saa(struct usb_device *, u16, u16);
int              write_000(struct usb_device *, u16, u16);
int              start_100(struct usb_device *);
int              stop_100(struct usb_device *);
int              write_300(struct usb_device *);
int              read_vt(struct usb_device *, u16);
int              write_vt(struct usb_device *, u16, u16);
int		isdongle(struct easycap *);
/*---------------------------------------------------------------------------*/
struct signed_div_result {
	long long int quotient;
	unsigned long long int remainder;
} signed_div(long long int, long long int);


/*---------------------------------------------------------------------------*/
/*
 *  MACROS SAM(...) AND JOM(...) ALLOW DIAGNOSTIC OUTPUT TO BE TAGGED WITH
 *  THE IDENTITY OF THE DONGLE TO WHICH IT APPLIES, BUT IF INVOKED WHEN THE
 *  POINTER peasycap IS INVALID AN Oops IS LIKELY, AND ITS CAUSE MAY NOT BE
 *  IMMEDIATELY OBVIOUS FROM A CASUAL READING OF THE SOURCE CODE.  BEWARE.
*/
/*---------------------------------------------------------------------------*/
const char *strerror(int err);

#define SAY(format, args...) do { \
	printk(KERN_DEBUG "easycap:: %s: " \
			format, __func__, ##args); \
} while (0)
#define SAM(format, args...) do { \
	printk(KERN_DEBUG "easycap::%i%s: " \
			format, peasycap->isdongle, __func__, ##args);\
} while (0)

#ifdef CONFIG_EASYCAP_DEBUG
extern int easycap_debug;
#define JOT(n, format, args...) do { \
	if (n <= easycap_debug) { \
		printk(KERN_DEBUG "easycap:: %s: " \
			format, __func__, ##args);\
	} \
} while (0)
#define JOM(n, format, args...) do { \
	if (n <= easycap_debug) { \
		printk(KERN_DEBUG "easycap::%i%s: " \
			format, peasycap->isdongle, __func__, ##args);\
	} \
} while (0)

#else
#define JOT(n, format, args...) do {} while (0)
#define JOM(n, format, args...) do {} while (0)
#endif /* CONFIG_EASYCAP_DEBUG */

#define MICROSECONDS(X, Y) \
			((1000000*((long long int)(X.tv_sec - Y.tv_sec))) + \
					(long long int)(X.tv_usec - Y.tv_usec))

/*---------------------------------------------------------------------------*/
/*
 *  (unsigned char *)P           pointer to next byte pair
 *       (long int *)X           pointer to accumulating count
 *       (long int *)Y           pointer to accumulating sum
 *  (long long int *)Z           pointer to accumulating sum of squares
 */
/*---------------------------------------------------------------------------*/
#define SUMMER(P, X, Y, Z) do {                                 \
	unsigned char *p;                                    \
	unsigned int u0, u1, u2;                             \
	long int s;                                          \
	p = (unsigned char *)(P);                            \
	u0 = (unsigned int) (*p);                            \
	u1 = (unsigned int) (*(p + 1));                      \
	u2 = (unsigned int) ((u1 << 8) | u0);                \
	if (0x8000 & u2)                                     \
		s = -(long int)(0x7FFF & (~u2));             \
	else                                                 \
		s =  (long int)(0x7FFF & u2);                \
	*((X)) += (long int) 1;                              \
	*((Y)) += (long int) s;                              \
	*((Z)) += ((long long int)(s) * (long long int)(s)); \
} while (0)
/*---------------------------------------------------------------------------*/

/*---------------------------------------------------------------------------*/
/* globals
 */
/*---------------------------------------------------------------------------*/

extern bool easycap_readback;
extern const struct easycap_standard easycap_standard[];
extern struct easycap_format easycap_format[];
extern struct v4l2_queryctrl easycap_control[];
extern struct usb_driver easycap_usb_driver;
extern struct easycap_dongle easycapdc60_dongle[];
#ifdef CONFIG_EASYCAP_OSS
extern struct usb_class_driver easyoss_class;
#endif /* !CONFIG_EASYCAP_OSS */

#endif /* !__EASYCAP_H__  */