summaryrefslogtreecommitdiff
path: root/drivers/media/video/zr36050.c
blob: 13b1e7b6fd6eb656bb1a7256d0b0dfe529b55ff6 (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
/*
 * Zoran ZR36050 basic configuration functions
 *
 * Copyright (C) 2001 Wolfgang Scherr <scherr@net4you.at>
 *
 * $Id: zr36050.c,v 1.1.2.11 2003/08/03 14:54:53 rbultje Exp $
 *
 * ------------------------------------------------------------------------
 *
 * 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.
 *
 * ------------------------------------------------------------------------
 */

#define ZR050_VERSION "v0.7.1"

#include <linux/version.h>
#include <linux/module.h>
#include <linux/init.h>
#include <linux/slab.h>
#include <linux/delay.h>

#include <linux/types.h>
#include <linux/wait.h>

/* includes for structures and defines regarding video 
   #include<linux/videodev.h> */

/* I/O commands, error codes */
#include<asm/io.h>
//#include<errno.h>

/* headerfile of this module */
#include"zr36050.h"

/* codec io API */
#include"videocodec.h"

/* it doesn't make sense to have more than 20 or so,
  just to prevent some unwanted loops */
#define MAX_CODECS 20

/* amount of chips attached via this driver */
static int zr36050_codecs = 0;

/* debugging is available via module parameter */

static int debug = 0;
module_param(debug, int, 0);
MODULE_PARM_DESC(debug, "Debug level (0-4)");

#define dprintk(num, format, args...) \
	do { \
		if (debug >= num) \
			printk(format, ##args); \
	} while (0)

/* =========================================================================
   Local hardware I/O functions:

   read/write via codec layer (registers are located in the master device)
   ========================================================================= */

/* read and write functions */
static u8
zr36050_read (struct zr36050 *ptr,
	      u16             reg)
{
	u8 value = 0;

	// just in case something is wrong...
	if (ptr->codec->master_data->readreg)
		value = (ptr->codec->master_data->readreg(ptr->codec,
							  reg)) & 0xFF;
	else
		dprintk(1,
			KERN_ERR "%s: invalid I/O setup, nothing read!\n",
			ptr->name);

	dprintk(4, "%s: reading from 0x%04x: %02x\n", ptr->name, reg,
		value);

	return value;
}

static void
zr36050_write (struct zr36050 *ptr,
	       u16             reg,
	       u8              value)
{
	dprintk(4, "%s: writing 0x%02x to 0x%04x\n", ptr->name, value,
		reg);

	// just in case something is wrong...
	if (ptr->codec->master_data->writereg)
		ptr->codec->master_data->writereg(ptr->codec, reg, value);
	else
		dprintk(1,
			KERN_ERR
			"%s: invalid I/O setup, nothing written!\n",
			ptr->name);
}

/* =========================================================================
   Local helper function:

   status read
   ========================================================================= */

/* status is kept in datastructure */
static u8
zr36050_read_status1 (struct zr36050 *ptr)
{
	ptr->status1 = zr36050_read(ptr, ZR050_STATUS_1);

	zr36050_read(ptr, 0);
	return ptr->status1;
}

/* =========================================================================
   Local helper function:

   scale factor read
   ========================================================================= */

/* scale factor is kept in datastructure */
static u16
zr36050_read_scalefactor (struct zr36050 *ptr)
{
	ptr->scalefact = (zr36050_read(ptr, ZR050_SF_HI) << 8) |
			 (zr36050_read(ptr, ZR050_SF_LO) & 0xFF);

	/* leave 0 selected for an eventually GO from master */
	zr36050_read(ptr, 0);
	return ptr->scalefact;
}

/* =========================================================================
   Local helper function:

   wait if codec is ready to proceed (end of processing) or time is over
   ========================================================================= */

static void
zr36050_wait_end (struct zr36050 *ptr)
{
	int i = 0;

	while (!(zr36050_read_status1(ptr) & 0x4)) {
		udelay(1);
		if (i++ > 200000) {	// 200ms, there is for shure something wrong!!!
			dprintk(1,
				"%s: timout at wait_end (last status: 0x%02x)\n",
				ptr->name, ptr->status1);
			break;
		}
	}
}

/* =========================================================================
   Local helper function:

   basic test of "connectivity", writes/reads to/from memory the SOF marker 
   ========================================================================= */

static int
zr36050_basic_test (struct zr36050 *ptr)
{
	zr36050_write(ptr, ZR050_SOF_IDX, 0x00);
	zr36050_write(ptr, ZR050_SOF_IDX + 1, 0x00);
	if ((zr36050_read(ptr, ZR050_SOF_IDX) |
	     zr36050_read(ptr, ZR050_SOF_IDX + 1)) != 0x0000) {
		dprintk(1,
			KERN_ERR
			"%s: attach failed, can't connect to jpeg processor!\n",
			ptr->name);
		return -ENXIO;
	}
	zr36050_write(ptr, ZR050_SOF_IDX, 0xff);
	zr36050_write(ptr, ZR050_SOF_IDX + 1, 0xc0);
	if (((zr36050_read(ptr, ZR050_SOF_IDX) << 8) |
	     zr36050_read(ptr, ZR050_SOF_IDX + 1)) != 0xffc0) {
		dprintk(1,
			KERN_ERR
			"%s: attach failed, can't connect to jpeg processor!\n",
			ptr->name);
		return -ENXIO;
	}

	zr36050_wait_end(ptr);
	if ((ptr->status1 & 0x4) == 0) {
		dprintk(1,
			KERN_ERR
			"%s: attach failed, jpeg processor failed (end flag)!\n",
			ptr->name);
		return -EBUSY;
	}

	return 0;		/* looks good! */
}

/* =========================================================================
   Local helper function:

   simple loop for pushing the init datasets
   ========================================================================= */

static int
zr36050_pushit (struct zr36050 *ptr,
	        u16             startreg,
	        u16             len,
	        const char     *data)
{
	int i = 0;

	dprintk(4, "%s: write data block to 0x%04x (len=%d)\n", ptr->name,
		startreg, len);
	while (i < len) {
		zr36050_write(ptr, startreg++, data[i++]);
	}

	return i;
}

/* =========================================================================
   Basic datasets:

   jpeg baseline setup data (you find it on lots places in internet, or just
   extract it from any regular .jpg image...)

   Could be variable, but until it's not needed it they are just fixed to save
   memory. Otherwise expand zr36050 structure with arrays, push the values to
   it and initalize from there, as e.g. the linux zr36057/60 driver does it.
   ========================================================================= */

static const char zr36050_dqt[0x86] = {
	0xff, 0xdb,		//Marker: DQT
	0x00, 0x84,		//Length: 2*65+2
	0x00,			//Pq,Tq first table
	0x10, 0x0b, 0x0c, 0x0e, 0x0c, 0x0a, 0x10, 0x0e,
	0x0d, 0x0e, 0x12, 0x11, 0x10, 0x13, 0x18, 0x28,
	0x1a, 0x18, 0x16, 0x16, 0x18, 0x31, 0x23, 0x25,
	0x1d, 0x28, 0x3a, 0x33, 0x3d, 0x3c, 0x39, 0x33,
	0x38, 0x37, 0x40, 0x48, 0x5c, 0x4e, 0x40, 0x44,
	0x57, 0x45, 0x37, 0x38, 0x50, 0x6d, 0x51, 0x57,
	0x5f, 0x62, 0x67, 0x68, 0x67, 0x3e, 0x4d, 0x71,
	0x79, 0x70, 0x64, 0x78, 0x5c, 0x65, 0x67, 0x63,
	0x01,			//Pq,Tq second table
	0x11, 0x12, 0x12, 0x18, 0x15, 0x18, 0x2f, 0x1a,
	0x1a, 0x2f, 0x63, 0x42, 0x38, 0x42, 0x63, 0x63,
	0x63, 0x63, 0x63, 0x63, 0x63, 0x63, 0x63, 0x63,
	0x63, 0x63, 0x63, 0x63, 0x63, 0x63, 0x63, 0x63,
	0x63, 0x63, 0x63, 0x63, 0x63, 0x63, 0x63, 0x63,
	0x63, 0x63, 0x63, 0x63, 0x63, 0x63, 0x63, 0x63,
	0x63, 0x63, 0x63, 0x63, 0x63, 0x63, 0x63, 0x63,
	0x63, 0x63, 0x63, 0x63, 0x63, 0x63, 0x63, 0x63
};

static const char zr36050_dht[0x1a4] = {
	0xff, 0xc4,		//Marker: DHT
	0x01, 0xa2,		//Length: 2*AC, 2*DC
	0x00,			//DC first table
	0x00, 0x01, 0x05, 0x01, 0x01, 0x01, 0x01, 0x01,
	0x01, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x01,
	0x02, 0x03, 0x04, 0x05, 0x06, 0x07, 0x08, 0x09, 0x0A, 0x0B,
	0x01,			//DC second table
	0x00, 0x03, 0x01, 0x01, 0x01, 0x01, 0x01, 0x01,
	0x01, 0x01, 0x01, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x01,
	0x02, 0x03, 0x04, 0x05, 0x06, 0x07, 0x08, 0x09, 0x0A, 0x0B,
	0x10,			//AC first table
	0x00, 0x02, 0x01, 0x03, 0x03, 0x02, 0x04, 0x03,
	0x05, 0x05, 0x04, 0x04, 0x00, 0x00,
	0x01, 0x7D, 0x01, 0x02, 0x03, 0x00, 0x04, 0x11,
	0x05, 0x12, 0x21, 0x31, 0x41, 0x06, 0x13, 0x51, 0x61,
	0x07, 0x22, 0x71, 0x14, 0x32, 0x81, 0x91, 0xA1,
	0x08, 0x23, 0x42, 0xB1, 0xC1, 0x15, 0x52, 0xD1, 0xF0, 0x24,
	0x33, 0x62, 0x72, 0x82, 0x09, 0x0A, 0x16, 0x17,
	0x18, 0x19, 0x1A, 0x25, 0x26, 0x27, 0x28, 0x29, 0x2A, 0x34,
	0x35, 0x36, 0x37, 0x38, 0x39, 0x3A, 0x43, 0x44,
	0x45, 0x46, 0x47, 0x48, 0x49, 0x4A, 0x53, 0x54, 0x55, 0x56,
	0x57, 0x58, 0x59, 0x5A, 0x63, 0x64, 0x65, 0x66,
	0x67, 0x68, 0x69, 0x6A, 0x73, 0x74, 0x75, 0x76, 0x77, 0x78,
	0x79, 0x7A, 0x83, 0x84, 0x85, 0x86, 0x87, 0x88,
	0x89, 0x8A, 0x92, 0x93, 0x94, 0x95, 0x96, 0x97, 0x98, 0x99,
	0x9A, 0xA2, 0xA3, 0xA4, 0xA5, 0xA6, 0xA7, 0xA8,
	0xA9, 0xAA, 0xB2, 0xB3, 0xB4, 0xB5, 0xB6, 0xB7, 0xB8, 0xB9,
	0xBA, 0xC2, 0xC3, 0xC4, 0xC5, 0xC6, 0xC7, 0xC8,
	0xC9, 0xCA, 0xD2, 0xD3, 0xD4, 0xD5, 0xD6, 0xD7, 0xD8, 0xD9,
	0xDA, 0xE1, 0xE2, 0xE3, 0xE4, 0xE5, 0xE6, 0xE7,
	0xE8, 0xE9, 0xEA, 0xF1, 0xF2, 0xF3, 0xF4, 0xF5, 0xF6, 0xF7,
	0xF8, 0xF9, 0xFA,
	0x11,			//AC second table
	0x00, 0x02, 0x01, 0x02, 0x04, 0x04, 0x03, 0x04,
	0x07, 0x05, 0x04, 0x04, 0x00, 0x01,
	0x02, 0x77, 0x00, 0x01, 0x02, 0x03, 0x11, 0x04,
	0x05, 0x21, 0x31, 0x06, 0x12, 0x41, 0x51, 0x07, 0x61, 0x71,
	0x13, 0x22, 0x32, 0x81, 0x08, 0x14, 0x42, 0x91,
	0xA1, 0xB1, 0xC1, 0x09, 0x23, 0x33, 0x52, 0xF0, 0x15, 0x62,
	0x72, 0xD1, 0x0A, 0x16, 0x24, 0x34, 0xE1, 0x25,
	0xF1, 0x17, 0x18, 0x19, 0x1A, 0x26, 0x27, 0x28, 0x29, 0x2A,
	0x35, 0x36, 0x37, 0x38, 0x39, 0x3A, 0x43, 0x44,
	0x45, 0x46, 0x47, 0x48, 0x49, 0x4A, 0x53, 0x54, 0x55, 0x56,
	0x57, 0x58, 0x59, 0x5A, 0x63, 0x64, 0x65, 0x66,
	0x67, 0x68, 0x69, 0x6A, 0x73, 0x74, 0x75, 0x76, 0x77, 0x78,
	0x79, 0x7A, 0x82, 0x83, 0x84, 0x85, 0x86, 0x87,
	0x88, 0x89, 0x8A, 0x92, 0x93, 0x94, 0x95, 0x96, 0x97, 0x98,
	0x99, 0x9A, 0xA2, 0xA3, 0xA4, 0xA5, 0xA6, 0xA7,
	0xA8, 0xA9, 0xAA, 0xB2, 0xB3, 0xB4, 0xB5, 0xB6, 0xB7, 0xB8,
	0xB9, 0xBA, 0xC2, 0xC3, 0xC4, 0xC5, 0xC6, 0xC7,
	0xC8, 0xC9, 0xCA, 0xD2, 0xD3, 0xD4, 0xD5, 0xD6, 0xD7, 0xD8,
	0xD9, 0xDA, 0xE2, 0xE3, 0xE4, 0xE5, 0xE6, 0xE7,
	0xE8, 0xE9, 0xEA, 0xF2, 0xF3, 0xF4, 0xF5, 0xF6, 0xF7, 0xF8,
	0xF9, 0xFA
};

/* jpeg baseline setup, this is just fixed in this driver (YUV pictures) */
#define NO_OF_COMPONENTS          0x3	//Y,U,V
#define BASELINE_PRECISION        0x8	//MCU size (?)
static const char zr36050_tq[8] = { 0, 1, 1, 0, 0, 0, 0, 0 };	//table idx's QT
static const char zr36050_td[8] = { 0, 1, 1, 0, 0, 0, 0, 0 };	//table idx's DC
static const char zr36050_ta[8] = { 0, 1, 1, 0, 0, 0, 0, 0 };	//table idx's AC

/* horizontal 422 decimation setup (maybe we support 411 or so later, too) */
static const char zr36050_decimation_h[8] = { 2, 1, 1, 0, 0, 0, 0, 0 };
static const char zr36050_decimation_v[8] = { 1, 1, 1, 0, 0, 0, 0, 0 };

/* =========================================================================
   Local helper functions:

   calculation and setup of parameter-dependent JPEG baseline segments
   (needed for compression only)
   ========================================================================= */

/* ------------------------------------------------------------------------- */

/* SOF (start of frame) segment depends on width, height and sampling ratio
                         of each color component */

static int
zr36050_set_sof (struct zr36050 *ptr)
{
	char sof_data[34];	// max. size of register set
	int i;

	dprintk(3, "%s: write SOF (%dx%d, %d components)\n", ptr->name,
		ptr->width, ptr->height, NO_OF_COMPONENTS);
	sof_data[0] = 0xff;
	sof_data[1] = 0xc0;
	sof_data[2] = 0x00;
	sof_data[3] = (3 * NO_OF_COMPONENTS) + 8;
	sof_data[4] = BASELINE_PRECISION;	// only '8' possible with zr36050
	sof_data[5] = (ptr->height) >> 8;
	sof_data[6] = (ptr->height) & 0xff;
	sof_data[7] = (ptr->width) >> 8;
	sof_data[8] = (ptr->width) & 0xff;
	sof_data[9] = NO_OF_COMPONENTS;
	for (i = 0; i < NO_OF_COMPONENTS; i++) {
		sof_data[10 + (i * 3)] = i;	// index identifier
		sof_data[11 + (i * 3)] = (ptr->h_samp_ratio[i] << 4) | (ptr->v_samp_ratio[i]);	// sampling ratios
		sof_data[12 + (i * 3)] = zr36050_tq[i];	// Q table selection
	}
	return zr36050_pushit(ptr, ZR050_SOF_IDX,
			      (3 * NO_OF_COMPONENTS) + 10, sof_data);
}

/* ------------------------------------------------------------------------- */

/* SOS (start of scan) segment depends on the used scan components 
                        of each color component */

static int
zr36050_set_sos (struct zr36050 *ptr)
{
	char sos_data[16];	// max. size of register set
	int i;

	dprintk(3, "%s: write SOS\n", ptr->name);
	sos_data[0] = 0xff;
	sos_data[1] = 0xda;
	sos_data[2] = 0x00;
	sos_data[3] = 2 + 1 + (2 * NO_OF_COMPONENTS) + 3;
	sos_data[4] = NO_OF_COMPONENTS;
	for (i = 0; i < NO_OF_COMPONENTS; i++) {
		sos_data[5 + (i * 2)] = i;	// index
		sos_data[6 + (i * 2)] = (zr36050_td[i] << 4) | zr36050_ta[i];	// AC/DC tbl.sel.
	}
	sos_data[2 + 1 + (2 * NO_OF_COMPONENTS) + 2] = 00;	// scan start
	sos_data[2 + 1 + (2 * NO_OF_COMPONENTS) + 3] = 0x3F;
	sos_data[2 + 1 + (2 * NO_OF_COMPONENTS) + 4] = 00;
	return zr36050_pushit(ptr, ZR050_SOS1_IDX,
			      4 + 1 + (2 * NO_OF_COMPONENTS) + 3,
			      sos_data);
}

/* ------------------------------------------------------------------------- */

/* DRI (define restart interval) */

static int
zr36050_set_dri (struct zr36050 *ptr)
{
	char dri_data[6];	// max. size of register set

	dprintk(3, "%s: write DRI\n", ptr->name);
	dri_data[0] = 0xff;
	dri_data[1] = 0xdd;
	dri_data[2] = 0x00;
	dri_data[3] = 0x04;
	dri_data[4] = ptr->dri >> 8;
	dri_data[5] = ptr->dri & 0xff;
	return zr36050_pushit(ptr, ZR050_DRI_IDX, 6, dri_data);
}

/* =========================================================================
   Setup function:

   Setup compression/decompression of Zoran's JPEG processor
   ( see also zoran 36050 manual )

   ... sorry for the spaghetti code ...
   ========================================================================= */
static void
zr36050_init (struct zr36050 *ptr)
{
	int sum = 0;
	long bitcnt, tmp;

	if (ptr->mode == CODEC_DO_COMPRESSION) {
		dprintk(2, "%s: COMPRESSION SETUP\n", ptr->name);

		/* 050 communicates with 057 in master mode */
		zr36050_write(ptr, ZR050_HARDWARE, ZR050_HW_MSTR);

		/* encoding table preload for compression */
		zr36050_write(ptr, ZR050_MODE,
			      ZR050_MO_COMP | ZR050_MO_TLM);
		zr36050_write(ptr, ZR050_OPTIONS, 0);

		/* disable all IRQs */
		zr36050_write(ptr, ZR050_INT_REQ_0, 0);
		zr36050_write(ptr, ZR050_INT_REQ_1, 3);	// low 2 bits always 1

		/* volume control settings */
		/*zr36050_write(ptr, ZR050_MBCV, ptr->max_block_vol);*/
		zr36050_write(ptr, ZR050_SF_HI, ptr->scalefact >> 8);
		zr36050_write(ptr, ZR050_SF_LO, ptr->scalefact & 0xff);

		zr36050_write(ptr, ZR050_AF_HI, 0xff);
		zr36050_write(ptr, ZR050_AF_M, 0xff);
		zr36050_write(ptr, ZR050_AF_LO, 0xff);

		/* setup the variable jpeg tables */
		sum += zr36050_set_sof(ptr);
		sum += zr36050_set_sos(ptr);
		sum += zr36050_set_dri(ptr);

		/* setup the fixed jpeg tables - maybe variable, though -
		 * (see table init section above) */
		dprintk(3, "%s: write DQT, DHT, APP\n", ptr->name);
		sum += zr36050_pushit(ptr, ZR050_DQT_IDX,
				      sizeof(zr36050_dqt), zr36050_dqt);
		sum += zr36050_pushit(ptr, ZR050_DHT_IDX,
				      sizeof(zr36050_dht), zr36050_dht);
		zr36050_write(ptr, ZR050_APP_IDX, 0xff);
		zr36050_write(ptr, ZR050_APP_IDX + 1, 0xe0 + ptr->app.appn);
		zr36050_write(ptr, ZR050_APP_IDX + 2, 0x00);
		zr36050_write(ptr, ZR050_APP_IDX + 3, ptr->app.len + 2);
		sum += zr36050_pushit(ptr, ZR050_APP_IDX + 4, 60,
				      ptr->app.data) + 4;
		zr36050_write(ptr, ZR050_COM_IDX, 0xff);
		zr36050_write(ptr, ZR050_COM_IDX + 1, 0xfe);
		zr36050_write(ptr, ZR050_COM_IDX + 2, 0x00);
		zr36050_write(ptr, ZR050_COM_IDX + 3, ptr->com.len + 2);
		sum += zr36050_pushit(ptr, ZR050_COM_IDX + 4, 60,
				      ptr->com.data) + 4;

		/* do the internal huffman table preload */
		zr36050_write(ptr, ZR050_MARKERS_EN, ZR050_ME_DHTI);

		zr36050_write(ptr, ZR050_GO, 1);	// launch codec
		zr36050_wait_end(ptr);
		dprintk(2, "%s: Status after table preload: 0x%02x\n",
			ptr->name, ptr->status1);

		if ((ptr->status1 & 0x4) == 0) {
			dprintk(1, KERN_ERR "%s: init aborted!\n",
				ptr->name);
			return;	// something is wrong, its timed out!!!!
		}

		/* setup misc. data for compression (target code sizes) */

		/* size of compressed code to reach without header data */
		sum = ptr->real_code_vol - sum;
		bitcnt = sum << 3;	/* need the size in bits */

		tmp = bitcnt >> 16;
		dprintk(3,
			"%s: code: csize=%d, tot=%d, bit=%ld, highbits=%ld\n",
			ptr->name, sum, ptr->real_code_vol, bitcnt, tmp);
		zr36050_write(ptr, ZR050_TCV_NET_HI, tmp >> 8);
		zr36050_write(ptr, ZR050_TCV_NET_MH, tmp & 0xff);
		tmp = bitcnt & 0xffff;
		zr36050_write(ptr, ZR050_TCV_NET_ML, tmp >> 8);
		zr36050_write(ptr, ZR050_TCV_NET_LO, tmp & 0xff);

		bitcnt -= bitcnt >> 7;	// bits without stuffing
		bitcnt -= ((bitcnt * 5) >> 6);	// bits without eob

		tmp = bitcnt >> 16;
		dprintk(3, "%s: code: nettobit=%ld, highnettobits=%ld\n",
			ptr->name, bitcnt, tmp);
		zr36050_write(ptr, ZR050_TCV_DATA_HI, tmp >> 8);
		zr36050_write(ptr, ZR050_TCV_DATA_MH, tmp & 0xff);
		tmp = bitcnt & 0xffff;
		zr36050_write(ptr, ZR050_TCV_DATA_ML, tmp >> 8);
		zr36050_write(ptr, ZR050_TCV_DATA_LO, tmp & 0xff);

		/* compression setup with or without bitrate control */
		zr36050_write(ptr, ZR050_MODE,
			      ZR050_MO_COMP | ZR050_MO_PASS2 |
			      (ptr->bitrate_ctrl ? ZR050_MO_BRC : 0));

		/* this headers seem to deliver "valid AVI" jpeg frames */
		zr36050_write(ptr, ZR050_MARKERS_EN,
			      ZR050_ME_DQT | ZR050_ME_DHT |
			      ((ptr->app.len > 0) ? ZR050_ME_APP : 0) |
			      ((ptr->com.len > 0) ? ZR050_ME_COM : 0));
	} else {
		dprintk(2, "%s: EXPANSION SETUP\n", ptr->name);

		/* 050 communicates with 055 in master mode */
		zr36050_write(ptr, ZR050_HARDWARE,
			      ZR050_HW_MSTR | ZR050_HW_CFIS_2_CLK);

		/* encoding table preload */
		zr36050_write(ptr, ZR050_MODE, ZR050_MO_TLM);

		/* disable all IRQs */
		zr36050_write(ptr, ZR050_INT_REQ_0, 0);
		zr36050_write(ptr, ZR050_INT_REQ_1, 3);	// low 2 bits always 1

		dprintk(3, "%s: write DHT\n", ptr->name);
		zr36050_pushit(ptr, ZR050_DHT_IDX, sizeof(zr36050_dht),
			       zr36050_dht);

		/* do the internal huffman table preload */
		zr36050_write(ptr, ZR050_MARKERS_EN, ZR050_ME_DHTI);

		zr36050_write(ptr, ZR050_GO, 1);	// launch codec
		zr36050_wait_end(ptr);
		dprintk(2, "%s: Status after table preload: 0x%02x\n",
			ptr->name, ptr->status1);

		if ((ptr->status1 & 0x4) == 0) {
			dprintk(1, KERN_ERR "%s: init aborted!\n",
				ptr->name);
			return;	// something is wrong, its timed out!!!!
		}

		/* setup misc. data for expansion */
		zr36050_write(ptr, ZR050_MODE, 0);
		zr36050_write(ptr, ZR050_MARKERS_EN, 0);
	}

	/* adr on selected, to allow GO from master */
	zr36050_read(ptr, 0);
}

/* =========================================================================
   CODEC API FUNCTIONS

   this functions are accessed by the master via the API structure
   ========================================================================= */

/* set compression/expansion mode and launches codec -
   this should be the last call from the master before starting processing */
static int
zr36050_set_mode (struct videocodec *codec,
		  int                mode)
{
	struct zr36050 *ptr = (struct zr36050 *) codec->data;

	dprintk(2, "%s: set_mode %d call\n", ptr->name, mode);

	if ((mode != CODEC_DO_EXPANSION) && (mode != CODEC_DO_COMPRESSION))
		return -EINVAL;

	ptr->mode = mode;
	zr36050_init(ptr);

	return 0;
}

/* set picture size (norm is ignored as the codec doesn't know about it) */
static int
zr36050_set_video (struct videocodec   *codec,
		   struct tvnorm       *norm,
		   struct vfe_settings *cap,
		   struct vfe_polarity *pol)
{
	struct zr36050 *ptr = (struct zr36050 *) codec->data;
	int size;

	dprintk(2, "%s: set_video %d.%d, %d/%d-%dx%d (0x%x) q%d call\n",
		ptr->name, norm->HStart, norm->VStart,
		cap->x, cap->y, cap->width, cap->height,
		cap->decimation, cap->quality);
	/* if () return -EINVAL;
	 * trust the master driver that it knows what it does - so
	 * we allow invalid startx/y and norm for now ... */
	ptr->width = cap->width / (cap->decimation & 0xff);
	ptr->height = cap->height / ((cap->decimation >> 8) & 0xff);

	/* (KM) JPEG quality */
	size = ptr->width * ptr->height;
	size *= 16; /* size in bits */
	/* apply quality setting */
	size = size * cap->quality / 200;

	/* Minimum: 1kb */
	if (size < 8192)
		size = 8192;
	/* Maximum: 7/8 of code buffer */
	if (size > ptr->total_code_vol * 7)
		size = ptr->total_code_vol * 7;

	ptr->real_code_vol = size >> 3; /* in bytes */

	/* Set max_block_vol here (previously in zr36050_init, moved
	 * here for consistency with zr36060 code */
	zr36050_write(ptr, ZR050_MBCV, ptr->max_block_vol);

	return 0;
}

/* additional control functions */
static int
zr36050_control (struct videocodec *codec,
		 int                type,
		 int                size,
		 void              *data)
{
	struct zr36050 *ptr = (struct zr36050 *) codec->data;
	int *ival = (int *) data;

	dprintk(2, "%s: control %d call with %d byte\n", ptr->name, type,
		size);

	switch (type) {
	case CODEC_G_STATUS:	/* get last status */
		if (size != sizeof(int))
			return -EFAULT;
		zr36050_read_status1(ptr);
		*ival = ptr->status1;
		break;

	case CODEC_G_CODEC_MODE:
		if (size != sizeof(int))
			return -EFAULT;
		*ival = CODEC_MODE_BJPG;
		break;

	case CODEC_S_CODEC_MODE:
		if (size != sizeof(int))
			return -EFAULT;
		if (*ival != CODEC_MODE_BJPG)
			return -EINVAL;
		/* not needed, do nothing */
		return 0;

	case CODEC_G_VFE:
	case CODEC_S_VFE:
		/* not needed, do nothing */
		return 0;

	case CODEC_S_MMAP:
		/* not available, give an error */
		return -ENXIO;

	case CODEC_G_JPEG_TDS_BYTE:	/* get target volume in byte */
		if (size != sizeof(int))
			return -EFAULT;
		*ival = ptr->total_code_vol;
		break;

	case CODEC_S_JPEG_TDS_BYTE:	/* get target volume in byte */
		if (size != sizeof(int))
			return -EFAULT;
		ptr->total_code_vol = *ival;
		/* (Kieran Morrissey)
		 * code copied from zr36060.c to ensure proper bitrate */
		ptr->real_code_vol = (ptr->total_code_vol * 6) >> 3;
		break;

	case CODEC_G_JPEG_SCALE:	/* get scaling factor */
		if (size != sizeof(int))
			return -EFAULT;
		*ival = zr36050_read_scalefactor(ptr);
		break;

	case CODEC_S_JPEG_SCALE:	/* set scaling factor */
		if (size != sizeof(int))
			return -EFAULT;
		ptr->scalefact = *ival;
		break;

	case CODEC_G_JPEG_APP_DATA: {	/* get appn marker data */
		struct jpeg_app_marker *app = data;

		if (size != sizeof(struct jpeg_app_marker))
			return -EFAULT;

		*app = ptr->app;
		break;
	}

	case CODEC_S_JPEG_APP_DATA: {	 /* set appn marker data */
		struct jpeg_app_marker *app = data;

		if (size != sizeof(struct jpeg_app_marker))
			return -EFAULT;

		ptr->app = *app;
		break;
	}

	case CODEC_G_JPEG_COM_DATA: {	/* get comment marker data */
		struct jpeg_com_marker *com = data;

		if (size != sizeof(struct jpeg_com_marker))
			return -EFAULT;

		*com = ptr->com;
		break;
	}

	case CODEC_S_JPEG_COM_DATA: {	/* set comment marker data */
		struct jpeg_com_marker *com = data;

		if (size != sizeof(struct jpeg_com_marker))
			return -EFAULT;

		ptr->com = *com;
		break;
	}

	default:
		return -EINVAL;
	}

	return size;
}

/* =========================================================================
   Exit and unregister function:

   Deinitializes Zoran's JPEG processor
   ========================================================================= */

static int
zr36050_unset (struct videocodec *codec)
{
	struct zr36050 *ptr = codec->data;

	if (ptr) {
		/* do wee need some codec deinit here, too ???? */

		dprintk(1, "%s: finished codec #%d\n", ptr->name,
			ptr->num);
		kfree(ptr);
		codec->data = NULL;

		zr36050_codecs--;
		return 0;
	}

	return -EFAULT;
}

/* =========================================================================
   Setup and registry function:

   Initializes Zoran's JPEG processor

   Also sets pixel size, average code size, mode (compr./decompr.)
   (the given size is determined by the processor with the video interface)
   ========================================================================= */

static int
zr36050_setup (struct videocodec *codec)
{
	struct zr36050 *ptr;
	int res;

	dprintk(2, "zr36050: initializing MJPEG subsystem #%d.\n",
		zr36050_codecs);

	if (zr36050_codecs == MAX_CODECS) {
		dprintk(1,
			KERN_ERR "zr36050: Can't attach more codecs!\n");
		return -ENOSPC;
	}
	//mem structure init
	codec->data = ptr = kmalloc(sizeof(struct zr36050), GFP_KERNEL);
	if (NULL == ptr) {
		dprintk(1, KERN_ERR "zr36050: Can't get enough memory!\n");
		return -ENOMEM;
	}
	memset(ptr, 0, sizeof(struct zr36050));

	snprintf(ptr->name, sizeof(ptr->name), "zr36050[%d]",
		 zr36050_codecs);
	ptr->num = zr36050_codecs++;
	ptr->codec = codec;

	//testing
	res = zr36050_basic_test(ptr);
	if (res < 0) {
		zr36050_unset(codec);
		return res;
	}
	//final setup
	memcpy(ptr->h_samp_ratio, zr36050_decimation_h, 8);
	memcpy(ptr->v_samp_ratio, zr36050_decimation_v, 8);

	ptr->bitrate_ctrl = 0;	/* 0 or 1 - fixed file size flag
				 * (what is the difference?) */
	ptr->mode = CODEC_DO_COMPRESSION;
	ptr->width = 384;
	ptr->height = 288;
	ptr->total_code_vol = 16000;
	ptr->max_block_vol = 240;
	ptr->scalefact = 0x100;
	ptr->dri = 1;

	/* no app/com marker by default */
	ptr->app.appn = 0;
	ptr->app.len = 0;
	ptr->com.len = 0;

	zr36050_init(ptr);

	dprintk(1, KERN_INFO "%s: codec attached and running\n",
		ptr->name);

	return 0;
}

static const struct videocodec zr36050_codec = {
	.owner = THIS_MODULE,
	.name = "zr36050",
	.magic = 0L,		// magic not used
	.flags =
	    CODEC_FLAG_JPEG | CODEC_FLAG_HARDWARE | CODEC_FLAG_ENCODER |
	    CODEC_FLAG_DECODER,
	.type = CODEC_TYPE_ZR36050,
	.setup = zr36050_setup,	// functionality
	.unset = zr36050_unset,
	.set_mode = zr36050_set_mode,
	.set_video = zr36050_set_video,
	.control = zr36050_control,
	// others are not used
};

/* =========================================================================
   HOOK IN DRIVER AS KERNEL MODULE
   ========================================================================= */

static int __init
zr36050_init_module (void)
{
	//dprintk(1, "ZR36050 driver %s\n",ZR050_VERSION);
	zr36050_codecs = 0;
	return videocodec_register(&zr36050_codec);
}

static void __exit
zr36050_cleanup_module (void)
{
	if (zr36050_codecs) {
		dprintk(1,
			"zr36050: something's wrong - %d codecs left somehow.\n",
			zr36050_codecs);
	}
	videocodec_unregister(&zr36050_codec);
}

module_init(zr36050_init_module);
module_exit(zr36050_cleanup_module);

MODULE_AUTHOR("Wolfgang Scherr <scherr@net4you.at>");
MODULE_DESCRIPTION("Driver module for ZR36050 jpeg processors "
		   ZR050_VERSION);
MODULE_LICENSE("GPL");