summaryrefslogtreecommitdiff
path: root/drivers/media/video/saa7191.c
blob: 454f5c1199b42b202ad576cba24f1ce0c7ff7ed0 (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
/*
 *  saa7191.c - Philips SAA7191 video decoder driver
 *
 *  Copyright (C) 2003 Ladislav Michl <ladis@linux-mips.org>
 *  Copyright (C) 2004,2005 Mikael Nousiainen <tmnousia@cc.hut.fi>
 *
 *  This program is free software; you can redistribute it and/or modify
 *  it under the terms of the GNU General Public License version 2 as
 *  published by the Free Software Foundation.
 */

#include <linux/module.h>
#include <linux/init.h>
#include <linux/delay.h>
#include <linux/errno.h>
#include <linux/fs.h>
#include <linux/kernel.h>
#include <linux/major.h>
#include <linux/slab.h>
#include <linux/mm.h>
#include <linux/sched.h>

#include <linux/videodev.h>
#include <linux/video_decoder.h>
#include <linux/i2c.h>

#include "saa7191.h"

#define SAA7191_MODULE_VERSION "0.0.3"

MODULE_DESCRIPTION("Philips SAA7191 video decoder driver");
MODULE_VERSION(SAA7191_MODULE_VERSION);
MODULE_AUTHOR("Mikael Nousiainen <tmnousia@cc.hut.fi>");
MODULE_LICENSE("GPL");

#define VINO_ADAPTER	(I2C_ALGO_SGI | I2C_HW_SGI_VINO)

struct saa7191 {
	struct i2c_client *client;

	/* the register values are stored here as the actual
	 * I2C-registers are write-only */
	unsigned char reg[25];

	unsigned char norm;
	unsigned char input;
};

static struct i2c_driver i2c_driver_saa7191;

static const unsigned char initseq[] = {
	0,	/* Subaddress */
	0x50,	/* SAA7191_REG_IDEL */
	0x30,	/* SAA7191_REG_HSYB */
	0x00,	/* SAA7191_REG_HSYS */
	0xe8,	/* SAA7191_REG_HCLB */
	0xb6,	/* SAA7191_REG_HCLS */
	0xf4,	/* SAA7191_REG_HPHI */
	0x01,	/* SAA7191_REG_LUMA - chrominance trap active (CVBS) */
	0x00,	/* SAA7191_REG_HUEC */
	0xf8,	/* SAA7191_REG_CKTQ */
	0xf8,	/* SAA7191_REG_CKTS */
	0x90,	/* SAA7191_REG_PLSE */
	0x90,	/* SAA7191_REG_SESE */
	0x00,	/* SAA7191_REG_GAIN */
	0x0c,	/* SAA7191_REG_STDC - not SECAM, slow time constant */
	0x78,	/* SAA7191_REG_IOCK - chrominance from CVBS, GPSW1 & 2 off */
	0x99,	/* SAA7191_REG_CTL3 - automatic field detection */
	0x00,	/* SAA7191_REG_CTL4 */
	0x2c,	/* SAA7191_REG_CHCV */
	0x00,	/* unused */
	0x00,	/* unused */
	0x34,	/* SAA7191_REG_HS6B */
	0x0a,	/* SAA7191_REG_HS6S */
	0xf4,	/* SAA7191_REG_HC6B */
	0xce,	/* SAA7191_REG_HC6S */
	0xf4,	/* SAA7191_REG_HP6I */
};

/* SAA7191 register handling */

static unsigned char saa7191_read_reg(struct i2c_client *client,
				      unsigned char reg)
{
	return ((struct saa7191 *)i2c_get_clientdata(client))->reg[reg];
}

static int saa7191_read_status(struct i2c_client *client,
			       unsigned char *value)
{
	int ret;

	ret = i2c_master_recv(client, value, 1);
	if (ret < 0) {
		printk(KERN_ERR "SAA7191: saa7191_read_status(): read failed");
		return ret;
	}

	return 0;
}


static int saa7191_write_reg(struct i2c_client *client, unsigned char reg,
			     unsigned char value)
{

	((struct saa7191 *)i2c_get_clientdata(client))->reg[reg] = value;
	return i2c_smbus_write_byte_data(client, reg, value);
}

/* the first byte of data must be the first subaddress number (register) */
static int saa7191_write_block(struct i2c_client *client,
			       unsigned char length, unsigned char *data)
{
	int i;
	int ret;

	struct saa7191 *decoder = (struct saa7191 *)i2c_get_clientdata(client);
	for (i = 0; i < (length - 1); i++) {
		decoder->reg[data[0] + i] = data[i + 1];
	}

	ret = i2c_master_send(client, data, length);
	if (ret < 0) {
		printk(KERN_ERR "SAA7191: saa7191_write_block(): "
		       "write failed");
		return ret;
	}

	return 0;
}

/* Helper functions */

static int saa7191_set_input(struct i2c_client *client, int input)
{
	unsigned char luma = saa7191_read_reg(client, SAA7191_REG_LUMA);
	unsigned char iock = saa7191_read_reg(client, SAA7191_REG_IOCK);
	int err;

	switch (input) {
	case SAA7191_INPUT_COMPOSITE: /* Set Composite input */
		iock &= ~(SAA7191_IOCK_CHRS | SAA7191_IOCK_GPSW1
			  | SAA7191_IOCK_GPSW2);
		/* Chrominance trap active */
		luma &= ~SAA7191_LUMA_BYPS;
		break;
	case SAA7191_INPUT_SVIDEO: /* Set S-Video input */
		iock |= SAA7191_IOCK_CHRS | SAA7191_IOCK_GPSW2;
		/* Chrominance trap bypassed */
		luma |= SAA7191_LUMA_BYPS;
		break;
	default:
		return -EINVAL;
	}

	err = saa7191_write_reg(client, SAA7191_REG_LUMA, luma);
	if (err)
		return -EIO;
	err = saa7191_write_reg(client, SAA7191_REG_IOCK, iock);
	if (err)
		return -EIO;

	return 0;
}

static int saa7191_set_norm(struct i2c_client *client, int norm)
{
	struct saa7191 *decoder = i2c_get_clientdata(client);
	unsigned char stdc = saa7191_read_reg(client, SAA7191_REG_STDC);
	unsigned char ctl3 = saa7191_read_reg(client, SAA7191_REG_CTL3);
	unsigned char chcv = saa7191_read_reg(client, SAA7191_REG_CHCV);
	int err;

	switch(norm) {
	case SAA7191_NORM_AUTO: {
		unsigned char status;

		// does status depend on current norm ?
		if (saa7191_read_status(client, &status))
			return -EIO;

		stdc &= ~SAA7191_STDC_SECS;
		ctl3 &= ~SAA7191_CTL3_FSEL;
		ctl3 |= SAA7191_CTL3_AUFD;
		chcv = (status & SAA7191_STATUS_FIDT)
			       ? SAA7191_CHCV_NTSC : SAA7191_CHCV_PAL;
		break;
	}
	case SAA7191_NORM_PAL:
		stdc &= ~SAA7191_STDC_SECS;
		ctl3 &= ~(SAA7191_CTL3_AUFD | SAA7191_CTL3_FSEL);
		chcv = SAA7191_CHCV_PAL;
		break;
	case SAA7191_NORM_NTSC:
		stdc &= ~SAA7191_STDC_SECS;
		ctl3 &= ~SAA7191_CTL3_AUFD;
		ctl3 |= SAA7191_CTL3_FSEL;
		chcv = SAA7191_CHCV_NTSC;
		break;
	case SAA7191_NORM_SECAM:
		stdc |= SAA7191_STDC_SECS;
		ctl3 &= ~(SAA7191_CTL3_AUFD | SAA7191_CTL3_FSEL);
		chcv = SAA7191_CHCV_PAL;
		break;
	default:
		return -EINVAL;
	}

	err = saa7191_write_reg(client, SAA7191_REG_CTL3, ctl3);
	if (err)
		return -EIO;
	err = saa7191_write_reg(client, SAA7191_REG_STDC, stdc);
	if (err)
		return -EIO;
	err = saa7191_write_reg(client, SAA7191_REG_CHCV, chcv);
	if (err)
		return -EIO;

	decoder->norm = norm;

	return 0;
}

static int saa7191_get_controls(struct i2c_client *client,
				struct saa7191_control *ctrl)
{
	unsigned char hue = saa7191_read_reg(client, SAA7191_REG_HUEC);
	unsigned char stdc = saa7191_read_reg(client, SAA7191_REG_STDC);

	if (hue < 0x80) {
		hue += 0x80;
	} else {
		hue -= 0x80;
	}
	ctrl->hue = hue;

	ctrl->vtrc = (stdc & SAA7191_STDC_VTRC)
		? SAA7191_VALUE_ENABLED : SAA7191_VALUE_DISABLED;

	return 0;
}

static int saa7191_set_controls(struct i2c_client *client,
				struct saa7191_control *ctrl)
{
	int err;

	if (ctrl->hue >= 0) {
		unsigned char hue = ctrl->hue & 0xff;
		if (hue < 0x80) {
			hue += 0x80;
		} else {
			hue -= 0x80;
		}
		err = saa7191_write_reg(client, SAA7191_REG_HUEC, hue);
		if (err)
			return -EIO;
	}
	if (ctrl->vtrc >= 0) {
		unsigned char stdc =
			saa7191_read_reg(client, SAA7191_REG_STDC);

		if (ctrl->vtrc) {
			stdc |= SAA7191_STDC_VTRC;
		} else {
			stdc &= ~SAA7191_STDC_VTRC;
		}

		err = saa7191_write_reg(client, SAA7191_REG_STDC, stdc);
		if (err)
			return -EIO;
	}

	return 0;
}

/* I2C-interface */

static int saa7191_attach(struct i2c_adapter *adap, int addr, int kind)
{
	int err = 0;
	struct saa7191 *decoder;
	struct i2c_client *client;

	printk(KERN_INFO "Philips SAA7191 driver version %s\n",
	       SAA7191_MODULE_VERSION);

	client = kmalloc(sizeof(*client), GFP_KERNEL);
	if (!client)
		return -ENOMEM;
	decoder = kmalloc(sizeof(*decoder), GFP_KERNEL);
	if (!decoder) {
		err = -ENOMEM;
		goto out_free_client;
	}

	memset(client, 0, sizeof(struct i2c_client));
	memset(decoder, 0, sizeof(struct saa7191));

	client->addr = addr;
	client->adapter = adap;
	client->driver = &i2c_driver_saa7191;
	client->flags = 0;
	strcpy(client->name, "saa7191 client");
	i2c_set_clientdata(client, decoder);

	decoder->client = client;

	err = i2c_attach_client(client);
	if (err)
		goto out_free_decoder;

	decoder->input = SAA7191_INPUT_COMPOSITE;
	decoder->norm = SAA7191_NORM_AUTO;

	err = saa7191_write_block(client, sizeof(initseq),
				  (unsigned char *)initseq);
	if (err) {
		printk(KERN_ERR "SAA7191 initialization failed\n");
		goto out_detach_client;
	}

	printk(KERN_INFO "SAA7191 initialized\n");

	return 0;

out_detach_client:
	i2c_detach_client(client);
out_free_decoder:
	kfree(decoder);
out_free_client:
	kfree(client);
	return err;
}

static int saa7191_probe(struct i2c_adapter *adap)
{
	/* Always connected to VINO */
	if (adap->id == VINO_ADAPTER)
		return saa7191_attach(adap, SAA7191_ADDR, 0);
	/* Feel free to add probe here :-) */
	return -ENODEV;
}

static int saa7191_detach(struct i2c_client *client)
{
	struct saa7191 *decoder = i2c_get_clientdata(client);

	i2c_detach_client(client);
	kfree(decoder);
	kfree(client);
	return 0;
}

static int saa7191_command(struct i2c_client *client, unsigned int cmd,
			   void *arg)
{
	struct saa7191 *decoder = i2c_get_clientdata(client);

	switch (cmd) {
	case DECODER_GET_CAPABILITIES: {
		struct video_decoder_capability *cap = arg;

		cap->flags  = VIDEO_DECODER_PAL | VIDEO_DECODER_NTSC |
			      VIDEO_DECODER_SECAM | VIDEO_DECODER_AUTO;
		cap->inputs = (client->adapter->id == VINO_ADAPTER) ? 2 : 1;
		cap->outputs = 1;
		break;
	}
	case DECODER_GET_STATUS: {
		int *iarg = arg;
		unsigned char status;
		int res = 0;

		if (saa7191_read_status(client, &status)) {
			return -EIO;
		}
		if ((status & SAA7191_STATUS_HLCK) == 0)
			res |= DECODER_STATUS_GOOD;
		if (status & SAA7191_STATUS_CODE)
			res |= DECODER_STATUS_COLOR;
		switch (decoder->norm) {
		case SAA7191_NORM_NTSC:
			res |= DECODER_STATUS_NTSC;
			break;
		case SAA7191_NORM_PAL:
			res |= DECODER_STATUS_PAL;
			break;
		case SAA7191_NORM_SECAM:
			res |= DECODER_STATUS_SECAM;
			break;
		case SAA7191_NORM_AUTO:
		default:
			if (status & SAA7191_STATUS_FIDT)
				res |= DECODER_STATUS_NTSC;
			else
				res |= DECODER_STATUS_PAL;
			break;
		}
		*iarg = res;
		break;
	}
	case DECODER_SET_NORM: {
		int *iarg = arg;

		switch (*iarg) {
		case VIDEO_MODE_AUTO:
			return saa7191_set_norm(client, SAA7191_NORM_AUTO);
		case VIDEO_MODE_PAL:
			return saa7191_set_norm(client, SAA7191_NORM_PAL);
		case VIDEO_MODE_NTSC:
			return saa7191_set_norm(client, SAA7191_NORM_NTSC);
		case VIDEO_MODE_SECAM:
			return saa7191_set_norm(client, SAA7191_NORM_SECAM);
		default:
			return -EINVAL;
		}
		break;
	}
	case DECODER_SET_INPUT:	{
		int *iarg = arg;

		switch (client->adapter->id) {
		case VINO_ADAPTER:
			return saa7191_set_input(client, *iarg);
		default:
			if (*iarg != 0)
				return -EINVAL;
		}
		break;
	}
	case DECODER_SET_OUTPUT: {
		int *iarg = arg;

		/* not much choice of outputs */
		if (*iarg != 0)
			return -EINVAL;
		break;
	}
	case DECODER_ENABLE_OUTPUT: {
		/* Always enabled */
		break;
	}
	case DECODER_SET_PICTURE: {
		struct video_picture *pic = arg;
		unsigned val;
		int err;

		val = (pic->hue >> 8) - 0x80;
		err = saa7191_write_reg(client, SAA7191_REG_HUEC, val);
		if (err)
			return -EIO;
		break;
	}
	case DECODER_SAA7191_GET_STATUS: {
		struct saa7191_status *status = arg;
		unsigned char status_reg;

		if (saa7191_read_status(client, &status_reg))
			return -EIO;
		status->signal = ((status_reg & SAA7191_STATUS_HLCK) == 0)
			? SAA7191_VALUE_ENABLED : SAA7191_VALUE_DISABLED;
		status->ntsc = (status_reg & SAA7191_STATUS_FIDT)
			? SAA7191_VALUE_ENABLED : SAA7191_VALUE_DISABLED;
		status->color = (status_reg & SAA7191_STATUS_CODE)
			? SAA7191_VALUE_ENABLED : SAA7191_VALUE_DISABLED;

		status->input = decoder->input;
		status->norm = decoder->norm;
	}
	case DECODER_SAA7191_SET_NORM: {
		int *norm = arg;
		return saa7191_set_norm(client, *norm);
	}
	case DECODER_SAA7191_GET_CONTROLS: {
		struct saa7191_control *ctrl = arg;
		return saa7191_get_controls(client, ctrl);
	}
	case DECODER_SAA7191_SET_CONTROLS: {
		struct saa7191_control *ctrl = arg;
		return saa7191_set_controls(client, ctrl);
	}
	default:
		return -EINVAL;
	}

	return 0;
}

static struct i2c_driver i2c_driver_saa7191 = {
	.owner		= THIS_MODULE,
	.name 		= "saa7191",
	.id 		= I2C_DRIVERID_SAA7191,
	.flags 		= I2C_DF_NOTIFY,
	.attach_adapter = saa7191_probe,
	.detach_client 	= saa7191_detach,
	.command 	= saa7191_command
};

static int saa7191_init(void)
{
	return i2c_add_driver(&i2c_driver_saa7191);
}

static void saa7191_exit(void)
{
	i2c_del_driver(&i2c_driver_saa7191);
}

module_init(saa7191_init);
module_exit(saa7191_exit);