aboutsummaryrefslogtreecommitdiffstats
path: root/drivers/media/video/zr36016.c
blob: 4ed898585c7082234aaec06bfd6e6150dd2068d4 (plain) (blame)
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
/*
 * Zoran ZR36016 basic configuration functions
 *
 * Copyright (C) 2001 Wolfgang Scherr <scherr@net4you.at>
 *
 * $Id: zr36016.c,v 1.1.2.14 2003/08/20 19:46:55 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 ZR016_VERSION "v0.7"

#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>

/* v4l  API */
#include<linux/videodev.h>

/* headerfile of this module */
#include"zr36016.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 zr36016_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
zr36016_read (struct zr36016 *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
zr36016_write (struct zr36016 *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);
}

/* indirect read and write functions */
/* the 016 supports auto-addr-increment, but
 * writing it all time cost not much and is safer... */
static u8
zr36016_readi (struct zr36016 *ptr,
	       u16             reg)
{
	u8 value = 0;

	// just in case something is wrong...
	if ((ptr->codec->master_data->writereg) &&
	    (ptr->codec->master_data->readreg)) {
		ptr->codec->master_data->writereg(ptr->codec, ZR016_IADDR, reg & 0x0F);	// ADDR
		value = (ptr->codec->master_data->readreg(ptr->codec, ZR016_IDATA)) & 0xFF;	// DATA
	} else
		dprintk(1,
			KERN_ERR
			"%s: invalid I/O setup, nothing read (i)!\n",
			ptr->name);

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

static void
zr36016_writei (struct zr36016 *ptr,
	        u16             reg,
	        u8              value)
{
	dprintk(4, "%s: writing indirect 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, ZR016_IADDR, reg & 0x0F);	// ADDR
		ptr->codec->master_data->writereg(ptr->codec, ZR016_IDATA, value & 0x0FF);	// DATA
	} else
		dprintk(1,
			KERN_ERR
			"%s: invalid I/O setup, nothing written (i)!\n",
			ptr->name);
}

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

   version read
   ========================================================================= */

/* version kept in datastructure */
static u8
zr36016_read_version (struct zr36016 *ptr)
{
	ptr->version = zr36016_read(ptr, 0) >> 4;
	return ptr->version;
}

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

   basic test of "connectivity", writes/reads to/from PAX-Lo register
   ========================================================================= */

static int
zr36016_basic_test (struct zr36016 *ptr)
{
	if (debug) {
		int i;
		zr36016_writei(ptr, ZR016I_PAX_LO, 0x55);
		dprintk(1, KERN_INFO "%s: registers: ", ptr->name);
		for (i = 0; i <= 0x0b; i++)
			dprintk(1, "%02x ", zr36016_readi(ptr, i));
		dprintk(1, "\n");
	}
	// for testing just write 0, then the default value to a register and read
	// it back in both cases 
	zr36016_writei(ptr, ZR016I_PAX_LO, 0x00);
	if (zr36016_readi(ptr, ZR016I_PAX_LO) != 0x0) {
		dprintk(1,
			KERN_ERR
			"%s: attach failed, can't connect to vfe processor!\n",
			ptr->name);
		return -ENXIO;
	}
	zr36016_writei(ptr, ZR016I_PAX_LO, 0x0d0);
	if (zr36016_readi(ptr, ZR016I_PAX_LO) != 0x0d0) {
		dprintk(1,
			KERN_ERR
			"%s: attach failed, can't connect to vfe processor!\n",
			ptr->name);
		return -ENXIO;
	}
	// we allow version numbers from 0-3, should be enough, though
	zr36016_read_version(ptr);
	if (ptr->version & 0x0c) {
		dprintk(1,
			KERN_ERR
			"%s: attach failed, suspicious version %d found...\n",
			ptr->name, ptr->version);
		return -ENXIO;
	}

	return 0;		/* looks good! */
}

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

   simple loop for pushing the init datasets - NO USE --
   ========================================================================= */

#if 0
static int zr36016_pushit (struct zr36016 *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) {
                zr36016_writei(ptr, startreg++,  data[i++]);
        }

        return i;
}
#endif

/* =========================================================================
   Basic datasets & init:

   //TODO//
   ========================================================================= */

// needed offset values          PAL NTSC SECAM
static const int zr016_xoff[] = { 20, 20, 20 };
static const int zr016_yoff[] = { 8, 9, 7 };

static void
zr36016_init (struct zr36016 *ptr)
{
	// stop any processing
	zr36016_write(ptr, ZR016_GOSTOP, 0);

	// mode setup (yuv422 in and out, compression/expansuon due to mode)
	zr36016_write(ptr, ZR016_MODE,
		      ZR016_YUV422 | ZR016_YUV422_YUV422 |
		      (ptr->mode == CODEC_DO_COMPRESSION ?
		       ZR016_COMPRESSION : ZR016_EXPANSION));

	// misc setup
	zr36016_writei(ptr, ZR016I_SETUP1,
		       (ptr->xdec ? (ZR016_HRFL | ZR016_HORZ) : 0) |
		       (ptr->ydec ? ZR016_VERT : 0) | ZR016_CNTI);
	zr36016_writei(ptr, ZR016I_SETUP2, ZR016_CCIR);

	// Window setup
	// (no extra offset for now, norm defines offset, default width height)
	zr36016_writei(ptr, ZR016I_PAX_HI, ptr->width >> 8);
	zr36016_writei(ptr, ZR016I_PAX_LO, ptr->width & 0xFF);
	zr36016_writei(ptr, ZR016I_PAY_HI, ptr->height >> 8);
	zr36016_writei(ptr, ZR016I_PAY_LO, ptr->height & 0xFF);
	zr36016_writei(ptr, ZR016I_NAX_HI, ptr->xoff >> 8);
	zr36016_writei(ptr, ZR016I_NAX_LO, ptr->xoff & 0xFF);
	zr36016_writei(ptr, ZR016I_NAY_HI, ptr->yoff >> 8);
	zr36016_writei(ptr, ZR016I_NAY_LO, ptr->yoff & 0xFF);

	/* shall we continue now, please? */
	zr36016_write(ptr, ZR016_GOSTOP, 1);
}

/* =========================================================================
   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
zr36016_set_mode (struct videocodec *codec,
		  int                mode)
{
	struct zr36016 *ptr = (struct zr36016 *) 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;
	zr36016_init(ptr);

	return 0;
}

/* set picture size */
static int
zr36016_set_video (struct videocodec   *codec,
		   struct tvnorm       *norm,
		   struct vfe_settings *cap,
		   struct vfe_polarity *pol)
{
	struct zr36016 *ptr = (struct zr36016 *) codec->data;

	dprintk(2, "%s: set_video %d.%d, %d/%d-%dx%d (0x%x) call\n",
		ptr->name, norm->HStart, norm->VStart,
		cap->x, cap->y, cap->width, cap->height,
		cap->decimation);

	/* if () return -EINVAL;
	 * trust the master driver that it knows what it does - so
	 * we allow invalid startx/y for now ... */
	ptr->width = cap->width;
	ptr->height = cap->height;
	/* (Ronald) This is ugly. zoran_device.c, line 387
	 * already mentions what happens if HStart is even
	 * (blue faces, etc., cr/cb inversed). There's probably
	 * some good reason why HStart is 0 instead of 1, so I'm
	 * leaving it to this for now, but really... This can be
	 * done a lot simpler */
	ptr->xoff = (norm->HStart ? norm->HStart : 1) + cap->x;
	/* Something to note here (I don't understand it), setting
	 * VStart too high will cause the codec to 'not work'. I
	 * really don't get it. values of 16 (VStart) already break
	 * it here. Just '0' seems to work. More testing needed! */
	ptr->yoff = norm->VStart + cap->y;
	/* (Ronald) dzjeeh, can't this thing do hor_decimation = 4? */
	ptr->xdec = ((cap->decimation & 0xff) == 1) ? 0 : 1;
	ptr->ydec = (((cap->decimation >> 8) & 0xff) == 1) ? 0 : 1;

	return 0;
}

/* additional control functions */
static int
zr36016_control (struct videocodec *codec,
		 int                type,
		 int                size,
		 void              *data)
{
	struct zr36016 *ptr = (struct zr36016 *) 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 - we don't know it ... */
		if (size != sizeof(int))
			return -EFAULT;
		*ival = 0;
		break;

	case CODEC_G_CODEC_MODE:
		if (size != sizeof(int))
			return -EFAULT;
		*ival = 0;
		break;

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

	case CODEC_G_VFE:
	case CODEC_S_VFE:
		return 0;

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

	default:
		return -EINVAL;
	}

	return size;
}

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

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

static int
zr36016_unset (struct videocodec *codec)
{
	struct zr36016 *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;

		zr36016_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
zr36016_setup (struct videocodec *codec)
{
	struct zr36016 *ptr;
	int res;

	dprintk(2, "zr36016: initializing VFE subsystem #%d.\n",
		zr36016_codecs);

	if (zr36016_codecs == MAX_CODECS) {
		dprintk(1,
			KERN_ERR "zr36016: Can't attach more codecs!\n");
		return -ENOSPC;
	}
	//mem structure init
	codec->data = ptr = kmalloc(sizeof(struct zr36016), GFP_KERNEL);
	if (NULL == ptr) {
		dprintk(1, KERN_ERR "zr36016: Can't get enough memory!\n");
		return -ENOMEM;
	}
	memset(ptr, 0, sizeof(struct zr36016));

	snprintf(ptr->name, sizeof(ptr->name), "zr36016[%d]",
		 zr36016_codecs);
	ptr->num = zr36016_codecs++;
	ptr->codec = codec;

	//testing
	res = zr36016_basic_test(ptr);
	if (res < 0) {
		zr36016_unset(codec);
		return res;
	}
	//final setup
	ptr->mode = CODEC_DO_COMPRESSION;
	ptr->width = 768;
	ptr->height = 288;
	ptr->xdec = 1;
	ptr->ydec = 0;
	zr36016_init(ptr);

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

	return 0;
}

static const struct videocodec zr36016_codec = {
	.owner = THIS_MODULE,
	.name = "zr36016",
	.magic = 0L,		// magic not used
	.flags =
	    CODEC_FLAG_HARDWARE | CODEC_FLAG_VFE | CODEC_FLAG_ENCODER |
	    CODEC_FLAG_DECODER,
	.type = CODEC_TYPE_ZR36016,
	.setup = zr36016_setup,	// functionality
	.unset = zr36016_unset,
	.set_mode = zr36016_set_mode,
	.set_video = zr36016_set_video,
	.control = zr36016_control,
	// others are not used
};

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

static int __init
zr36016_init_module (void)
{
	//dprintk(1, "ZR36016 driver %s\n",ZR016_VERSION);
	zr36016_codecs = 0;
	return videocodec_register(&zr36016_codec);
}

static void __exit
zr36016_cleanup_module (void)
{
	if (zr36016_codecs) {
		dprintk(1,
			"zr36016: something's wrong - %d codecs left somehow.\n",
			zr36016_codecs);
	}
	videocodec_unregister(&zr36016_codec);
}

module_init(zr36016_init_module);
module_exit(zr36016_cleanup_module);

MODULE_AUTHOR("Wolfgang Scherr <scherr@net4you.at>");
MODULE_DESCRIPTION("Driver module for ZR36016 video frontends "
		   ZR016_VERSION);
MODULE_LICENSE("GPL");