aboutsummaryrefslogtreecommitdiff
path: root/drivers/media/video/saa7164/saa7164-api.c
blob: 6f094a96ac810afbfbad67667b50bcd70cdca7d9 (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
/*
 *  Driver for the NXP SAA7164 PCIe bridge
 *
 *  Copyright (c) 2009 Steven Toth <stoth@kernellabs.com>
 *
 *  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.
 */

#include <linux/wait.h>

#include "saa7164.h"

int saa7164_api_transition_port(struct saa7164_tsport *port, u8 mode)
{
	int ret;

	ret = saa7164_cmd_send(port->dev, port->hwcfg.unitid, SET_CUR,
		SAA_STATE_CONTROL, sizeof(mode), &mode);
	if (ret != SAA_OK)
		printk(KERN_ERR "%s() error, ret = 0x%x\n", __func__, ret);

	return ret;
}

int saa7164_api_get_fw_version(struct saa7164_dev *dev, u32 *version)
{
	int ret;

	ret = saa7164_cmd_send(dev, 0, GET_CUR,
		GET_FW_VERSION_CONTROL, sizeof(u32), version);
	if (ret != SAA_OK)
		printk(KERN_ERR "%s() error, ret = 0x%x\n", __func__, ret);

	return ret;
}

int saa7164_api_read_eeprom(struct saa7164_dev *dev, u8 *buf, int buflen)
{
	u8 reg[] = { 0x0f, 0x00 };

	if (buflen < 128)
		return -ENOMEM;

	/* Assumption: Hauppauge eeprom is at 0xa0 on on bus 0 */
	/* TODO: Pull the details from the boards struct */
	return saa7164_api_i2c_read(&dev->i2c_bus[0], 0xa0 >> 1, sizeof(reg),
		&reg[0], 128, buf);
}


int saa7164_api_configure_port_mpeg2ts(struct saa7164_dev *dev,
	struct saa7164_tsport *port,
	tmComResTSFormatDescrHeader_t *tsfmt)
{
	dprintk(DBGLVL_API, "    bFormatIndex = 0x%x\n", tsfmt->bFormatIndex);
	dprintk(DBGLVL_API, "    bDataOffset  = 0x%x\n", tsfmt->bDataOffset);
	dprintk(DBGLVL_API, "    bPacketLength= 0x%x\n", tsfmt->bPacketLength);
	dprintk(DBGLVL_API, "    bStrideLength= 0x%x\n", tsfmt->bStrideLength);
	dprintk(DBGLVL_API, "    bguid        = (....)\n");

	/* Cache the hardware configuration in the port */

	port->bufcounter = port->hwcfg.BARLocation;
	port->pitch = port->hwcfg.BARLocation + (2 * sizeof(u32));
	port->bufsize = port->hwcfg.BARLocation + (3 * sizeof(u32));
	port->bufoffset = port->hwcfg.BARLocation + (4 * sizeof(u32));
	port->bufptr32l = port->hwcfg.BARLocation +
		(4 * sizeof(u32)) +
		(sizeof(u32) * port->hwcfg.buffercount) + sizeof(u32);
	port->bufptr32h = port->hwcfg.BARLocation +
		(4 * sizeof(u32)) +
		(sizeof(u32) * port->hwcfg.buffercount);
	port->bufptr64 = port->hwcfg.BARLocation +
		(4 * sizeof(u32)) +
		(sizeof(u32) * port->hwcfg.buffercount);
	dprintk(DBGLVL_API, "   = port->hwcfg.BARLocation = 0x%x\n",
		port->hwcfg.BARLocation);

	dprintk(DBGLVL_API, "   = VS_FORMAT_MPEGTS (becomes dev->ts[%d])\n",
		port->nr);

	return 0;
}

int saa7164_api_dump_subdevs(struct saa7164_dev *dev, u8 *buf, int len)
{
	struct saa7164_tsport *port = 0;
	u32 idx, next_offset;
	int i;
	tmComResDescrHeader_t *hdr, *t;
	tmComResExtDevDescrHeader_t *exthdr;
	tmComResPathDescrHeader_t *pathhdr;
	tmComResAntTermDescrHeader_t *anttermhdr;
	tmComResTunerDescrHeader_t *tunerunithdr;
	tmComResDMATermDescrHeader_t *vcoutputtermhdr;
	tmComResTSFormatDescrHeader_t *tsfmt;
	u32 currpath = 0;

	dprintk(DBGLVL_API,
		"%s(?,?,%d) sizeof(tmComResDescrHeader_t) = %d bytes\n",
		__func__, len, (u32)sizeof(tmComResDescrHeader_t));

	for (idx = 0; idx < (len - sizeof(tmComResDescrHeader_t)); ) {

		hdr = (tmComResDescrHeader_t *)(buf + idx);

		if (hdr->type != CS_INTERFACE)
			return SAA_ERR_NOT_SUPPORTED;

		dprintk(DBGLVL_API, "@ 0x%x = \n", idx);
		switch (hdr->subtype) {
		case GENERAL_REQUEST:
			dprintk(DBGLVL_API, " GENERAL_REQUEST\n");
			break;
		case VC_TUNER_PATH:
			dprintk(DBGLVL_API, " VC_TUNER_PATH\n");
			pathhdr = (tmComResPathDescrHeader_t *)(buf + idx);
			dprintk(DBGLVL_API, "  pathid = 0x%x\n",
				pathhdr->pathid);
			currpath = pathhdr->pathid;
			break;
		case VC_INPUT_TERMINAL:
			dprintk(DBGLVL_API, " VC_INPUT_TERMINAL\n");
			anttermhdr =
				(tmComResAntTermDescrHeader_t *)(buf + idx);
			dprintk(DBGLVL_API, "  terminalid   = 0x%x\n",
				anttermhdr->terminalid);
			dprintk(DBGLVL_API, "  terminaltype = 0x%x\n",
				anttermhdr->terminaltype);
			switch (anttermhdr->terminaltype) {
			case ITT_ANTENNA:
				dprintk(DBGLVL_API, "   = ITT_ANTENNA\n");
				break;
			case LINE_CONNECTOR:
				dprintk(DBGLVL_API, "   = LINE_CONNECTOR\n");
				break;
			case SPDIF_CONNECTOR:
				dprintk(DBGLVL_API, "   = SPDIF_CONNECTOR\n");
				break;
			case COMPOSITE_CONNECTOR:
				dprintk(DBGLVL_API,
					"   = COMPOSITE_CONNECTOR\n");
				break;
			case SVIDEO_CONNECTOR:
				dprintk(DBGLVL_API, "   = SVIDEO_CONNECTOR\n");
				break;
			case COMPONENT_CONNECTOR:
				dprintk(DBGLVL_API,
					"   = COMPONENT_CONNECTOR\n");
				break;
			case STANDARD_DMA:
				dprintk(DBGLVL_API, "   = STANDARD_DMA\n");
				break;
			default:
				dprintk(DBGLVL_API, "   = undefined (0x%x)\n",
					anttermhdr->terminaltype);
			}
			dprintk(DBGLVL_API, "  assocterminal= 0x%x\n",
				anttermhdr->assocterminal);
			dprintk(DBGLVL_API, "  iterminal    = 0x%x\n",
				anttermhdr->iterminal);
			dprintk(DBGLVL_API, "  controlsize  = 0x%x\n",
				anttermhdr->controlsize);
			break;
		case VC_OUTPUT_TERMINAL:
			dprintk(DBGLVL_API, " VC_OUTPUT_TERMINAL\n");
			vcoutputtermhdr =
				(tmComResDMATermDescrHeader_t *)(buf + idx);
			dprintk(DBGLVL_API, "  unitid = 0x%x\n",
				vcoutputtermhdr->unitid);
			dprintk(DBGLVL_API, "  terminaltype = 0x%x\n",
				vcoutputtermhdr->terminaltype);
			switch (vcoutputtermhdr->terminaltype) {
			case ITT_ANTENNA:
				dprintk(DBGLVL_API, "   = ITT_ANTENNA\n");
				break;
			case LINE_CONNECTOR:
				dprintk(DBGLVL_API, "   = LINE_CONNECTOR\n");
				break;
			case SPDIF_CONNECTOR:
				dprintk(DBGLVL_API, "   = SPDIF_CONNECTOR\n");
				break;
			case COMPOSITE_CONNECTOR:
				dprintk(DBGLVL_API,
					"   = COMPOSITE_CONNECTOR\n");
				break;
			case SVIDEO_CONNECTOR:
				dprintk(DBGLVL_API, "   = SVIDEO_CONNECTOR\n");
				break;
			case COMPONENT_CONNECTOR:
				dprintk(DBGLVL_API,
					"   = COMPONENT_CONNECTOR\n");
				break;
			case STANDARD_DMA:
				dprintk(DBGLVL_API, "   = STANDARD_DMA\n");
				break;
			default:
				dprintk(DBGLVL_API, "   = undefined (0x%x)\n",
					vcoutputtermhdr->terminaltype);
			}
			dprintk(DBGLVL_API, "  assocterminal= 0x%x\n",
				vcoutputtermhdr->assocterminal);
			dprintk(DBGLVL_API, "  sourceid     = 0x%x\n",
				vcoutputtermhdr->sourceid);
			dprintk(DBGLVL_API, "  iterminal    = 0x%x\n",
				vcoutputtermhdr->iterminal);
			dprintk(DBGLVL_API, "  BARLocation  = 0x%x\n",
				vcoutputtermhdr->BARLocation);
			dprintk(DBGLVL_API, "  flags        = 0x%x\n",
				vcoutputtermhdr->flags);
			dprintk(DBGLVL_API, "  interruptid  = 0x%x\n",
				vcoutputtermhdr->interruptid);
			dprintk(DBGLVL_API, "  buffercount  = 0x%x\n",
				vcoutputtermhdr->buffercount);
			dprintk(DBGLVL_API, "  metadatasize = 0x%x\n",
				vcoutputtermhdr->metadatasize);
			dprintk(DBGLVL_API, "  controlsize  = 0x%x\n",
				vcoutputtermhdr->controlsize);
			dprintk(DBGLVL_API, "  numformats   = 0x%x\n",
				vcoutputtermhdr->numformats);

			t = (tmComResDescrHeader_t *)
				((tmComResDMATermDescrHeader_t *)(buf + idx));
			next_offset = idx + (vcoutputtermhdr->len);
			for (i = 0; i < vcoutputtermhdr->numformats; i++) {
				t = (tmComResDescrHeader_t *)
					(buf + next_offset);
				switch (t->subtype) {
				case VS_FORMAT_MPEG2TS:
					tsfmt =
					(tmComResTSFormatDescrHeader_t *)t;
					if (currpath == 1)
						port = &dev->ts1;
					else
						port = &dev->ts2;
					memcpy(&port->hwcfg, vcoutputtermhdr,
						sizeof(*vcoutputtermhdr));
					saa7164_api_configure_port_mpeg2ts(dev,
						port, tsfmt);
					break;
				case VS_FORMAT_MPEG2PS:
					dprintk(DBGLVL_API,
						"   = VS_FORMAT_MPEG2PS\n");
					break;
				case VS_FORMAT_VBI:
					dprintk(DBGLVL_API,
						"   = VS_FORMAT_VBI\n");
					break;
				case VS_FORMAT_RDS:
					dprintk(DBGLVL_API,
						"   = VS_FORMAT_RDS\n");
					break;
				case VS_FORMAT_UNCOMPRESSED:
					dprintk(DBGLVL_API,
					"   = VS_FORMAT_UNCOMPRESSED\n");
					break;
				case VS_FORMAT_TYPE:
					dprintk(DBGLVL_API,
						"   = VS_FORMAT_TYPE\n");
					break;
				default:
					dprintk(DBGLVL_API,
						"   = undefined (0x%x)\n",
						t->subtype);
				}
				next_offset += t->len;
			}

			break;
		case TUNER_UNIT:
			dprintk(DBGLVL_API, " TUNER_UNIT\n");
			tunerunithdr =
				(tmComResTunerDescrHeader_t *)(buf + idx);
			dprintk(DBGLVL_API, "  unitid = 0x%x\n",
				tunerunithdr->unitid);
			dprintk(DBGLVL_API, "  sourceid = 0x%x\n",
				tunerunithdr->sourceid);
			dprintk(DBGLVL_API, "  iunit = 0x%x\n",
				tunerunithdr->iunit);
			dprintk(DBGLVL_API, "  tuningstandards = 0x%x\n",
				tunerunithdr->tuningstandards);
			dprintk(DBGLVL_API, "  controlsize = 0x%x\n",
				tunerunithdr->controlsize);
			dprintk(DBGLVL_API, "  controls = 0x%x\n",
				tunerunithdr->controls);
			break;
		case VC_SELECTOR_UNIT:
			dprintk(DBGLVL_API, " VC_SELECTOR_UNIT\n");
			break;
		case VC_PROCESSING_UNIT:
			dprintk(DBGLVL_API, " VC_PROCESSING_UNIT\n");
			break;
		case FEATURE_UNIT:
			dprintk(DBGLVL_API, " FEATURE_UNIT\n");
			break;
		case ENCODER_UNIT:
			dprintk(DBGLVL_API, " ENCODER_UNIT\n");
			break;
		case EXTENSION_UNIT:
			dprintk(DBGLVL_API, " EXTENSION_UNIT\n");
			exthdr = (tmComResExtDevDescrHeader_t *)(buf + idx);
			dprintk(DBGLVL_API, "  unitid = 0x%x\n",
				exthdr->unitid);
			dprintk(DBGLVL_API, "  deviceid = 0x%x\n",
				exthdr->deviceid);
			dprintk(DBGLVL_API, "  devicetype = 0x%x\n",
				exthdr->devicetype);
			if (exthdr->devicetype & 0x1)
				dprintk(DBGLVL_API, "   = Decoder Device\n");
			if (exthdr->devicetype & 0x2)
				dprintk(DBGLVL_API, "   = GPIO Source\n");
			if (exthdr->devicetype & 0x4)
				dprintk(DBGLVL_API, "   = Video Decoder\n");
			if (exthdr->devicetype & 0x8)
				dprintk(DBGLVL_API, "   = Audio Decoder\n");
			if (exthdr->devicetype & 0x20)
				dprintk(DBGLVL_API, "   = Crossbar\n");
			if (exthdr->devicetype & 0x40)
				dprintk(DBGLVL_API, "   = Tuner\n");
			if (exthdr->devicetype & 0x80)
				dprintk(DBGLVL_API, "   = IF PLL\n");
			if (exthdr->devicetype & 0x100)
				dprintk(DBGLVL_API, "   = Demodulator\n");
			if (exthdr->devicetype & 0x200)
				dprintk(DBGLVL_API, "   = RDS Decoder\n");
			if (exthdr->devicetype & 0x400)
				dprintk(DBGLVL_API, "   = Encoder\n");
			if (exthdr->devicetype & 0x800)
				dprintk(DBGLVL_API, "   = IR Decoder\n");
			if (exthdr->devicetype & 0x1000)
				dprintk(DBGLVL_API, "   = EEPROM\n");
			if (exthdr->devicetype & 0x2000)
				dprintk(DBGLVL_API,
					"   = VBI Decoder\n");
			if (exthdr->devicetype & 0x10000)
				dprintk(DBGLVL_API,
					"   = Streaming Device\n");
			if (exthdr->devicetype & 0x20000)
				dprintk(DBGLVL_API,
					"   = DRM Device\n");
			if (exthdr->devicetype & 0x40000000)
				dprintk(DBGLVL_API,
					"   = Generic Device\n");
			if (exthdr->devicetype & 0x80000000)
				dprintk(DBGLVL_API,
					"   = Config Space Device\n");
			dprintk(DBGLVL_API, "  numgpiopins = 0x%x\n",
				exthdr->numgpiopins);
			dprintk(DBGLVL_API, "  numgpiogroups = 0x%x\n",
				exthdr->numgpiogroups);
			dprintk(DBGLVL_API, "  controlsize = 0x%x\n",
				exthdr->controlsize);
			break;
		case PVC_INFRARED_UNIT:
			dprintk(DBGLVL_API, " PVC_INFRARED_UNIT\n");
			break;
		case DRM_UNIT:
			dprintk(DBGLVL_API, " DRM_UNIT\n");
			break;
		default:
			dprintk(DBGLVL_API, "default %d\n", hdr->subtype);
		}

		dprintk(DBGLVL_API, " 1.%x\n", hdr->len);
		dprintk(DBGLVL_API, " 2.%x\n", hdr->type);
		dprintk(DBGLVL_API, " 3.%x\n", hdr->subtype);
		dprintk(DBGLVL_API, " 4.%x\n", hdr->unitid);

		idx += hdr->len;
	}

	return 0;
}

int saa7164_api_enum_subdevs(struct saa7164_dev *dev)
{
	int ret;
	u32 buflen = 0;
	u8 *buf;

	dprintk(DBGLVL_API, "%s()\n", __func__);

	/* Get the total descriptor length */
	ret = saa7164_cmd_send(dev, 0, GET_LEN,
		GET_DESCRIPTORS_CONTROL, sizeof(buflen), &buflen);
	if (ret != SAA_OK)
		printk(KERN_ERR "%s() error, ret = 0x%x\n", __func__, ret);

	dprintk(DBGLVL_API, "%s() total descriptor size = %d bytes.\n",
		__func__, buflen);

	/* Allocate enough storage for all of the descs */
	buf = kzalloc(buflen, GFP_KERNEL);
	if (buf == NULL)
		return SAA_ERR_NO_RESOURCES;

	/* Retrieve them */
	ret = saa7164_cmd_send(dev, 0, GET_CUR,
		GET_DESCRIPTORS_CONTROL, buflen, buf);
	if (ret != SAA_OK) {
		printk(KERN_ERR "%s() error, ret = 0x%x\n", __func__, ret);
		goto out;
	}

	if (saa_debug & DBGLVL_API)
		saa7164_dumphex16(dev, buf, (buflen/16)*16);

	saa7164_api_dump_subdevs(dev, buf, buflen);

out:
	kfree(buf);
	return ret;
}

int saa7164_api_i2c_read(struct saa7164_i2c *bus, u8 addr, u32 reglen, u8 *reg,
	u32 datalen, u8 *data)
{
	struct saa7164_dev *dev = bus->dev;
	u16 len = 0;
	int unitid;
	u32 regval;
	u8 buf[256];
	int ret;

	dprintk(DBGLVL_API, "%s()\n", __func__);

	if (reglen > 4)
		return -EIO;

	if (reglen == 1)
		regval = *(reg);
	else
	if (reglen == 2)
		regval = ((*(reg) << 8) || *(reg+1));
	else
	if (reglen == 3)
		regval = ((*(reg) << 16) | (*(reg+1) << 8) | *(reg+2));
	else
	if (reglen == 4)
		regval = ((*(reg) << 24) | (*(reg+1) << 16) |
			(*(reg+2) << 8) | *(reg+3));

	/* Prepare the send buffer */
	/* Bytes 00-03 source register length
	 *       04-07 source bytes to read
	 *       08... register address
	 */
	memset(buf, 0, sizeof(buf));
	memcpy((buf + 2 * sizeof(u32) + 0), reg, reglen);
	*((u32 *)(buf + 0 * sizeof(u32))) = reglen;
	*((u32 *)(buf + 1 * sizeof(u32))) = datalen;

	unitid = saa7164_i2caddr_to_unitid(bus, addr);
	if (unitid < 0) {
		printk(KERN_ERR
			"%s() error, cannot translate regaddr 0x%x to unitid\n",
			__func__, addr);
		return -EIO;
	}

	ret = saa7164_cmd_send(bus->dev, unitid, GET_LEN,
		EXU_REGISTER_ACCESS_CONTROL, sizeof(len), &len);
	if (ret != SAA_OK) {
		printk(KERN_ERR "%s() error, ret(1) = 0x%x\n", __func__, ret);
		return -EIO;
	}

	dprintk(DBGLVL_API, "%s() len = %d bytes\n", __func__, len);

	if (saa_debug & DBGLVL_I2C)
		saa7164_dumphex16(dev, buf, 2 * 16);

	ret = saa7164_cmd_send(bus->dev, unitid, GET_CUR,
		EXU_REGISTER_ACCESS_CONTROL, len, &buf);
	if (ret != SAA_OK)
		printk(KERN_ERR "%s() error, ret(2) = 0x%x\n", __func__, ret);
	else {
		if (saa_debug & DBGLVL_I2C)
			saa7164_dumphex16(dev, buf, sizeof(buf));
		memcpy(data, (buf + 2 * sizeof(u32) + reglen), datalen);
	}

	return ret == SAA_OK ? 0 : -EIO;
}

/* For a given 8 bit i2c address device, write the buffer */
int saa7164_api_i2c_write(struct saa7164_i2c *bus, u8 addr, u32 datalen,
	u8 *data)
{
	struct saa7164_dev *dev = bus->dev;
	u16 len = 0;
	int unitid;
	int reglen;
	u8 buf[256];
	int ret;

	dprintk(DBGLVL_API, "%s()\n", __func__);

	if ((datalen == 0) || (datalen > 232))
		return -EIO;

	memset(buf, 0, sizeof(buf));

	unitid = saa7164_i2caddr_to_unitid(bus, addr);
	if (unitid < 0) {
		printk(KERN_ERR
			"%s() error, cannot translate regaddr 0x%x to unitid\n",
			__func__, addr);
		return -EIO;
	}

	reglen = saa7164_i2caddr_to_reglen(bus, addr);
	if (unitid < 0) {
		printk(KERN_ERR
			"%s() error, cannot translate regaddr to reglen\n",
			__func__);
		return -EIO;
	}

	ret = saa7164_cmd_send(bus->dev, unitid, GET_LEN,
		EXU_REGISTER_ACCESS_CONTROL, sizeof(len), &len);
	if (ret != SAA_OK) {
		printk(KERN_ERR "%s() error, ret(1) = 0x%x\n", __func__, ret);
		return -EIO;
	}

	dprintk(DBGLVL_API, "%s() len = %d bytes\n", __func__, len);

	/* Prepare the send buffer */
	/* Bytes 00-03 dest register length
	 *       04-07 dest bytes to write
	 *       08... register address
	 */
	*((u32 *)(buf + 0 * sizeof(u32))) = reglen;
	*((u32 *)(buf + 1 * sizeof(u32))) = datalen - reglen;
	memcpy((buf + 2 * sizeof(u32)), data, datalen);

	if (saa_debug & DBGLVL_I2C)
		saa7164_dumphex16(dev, buf, sizeof(buf));

	ret = saa7164_cmd_send(bus->dev, unitid, SET_CUR,
		EXU_REGISTER_ACCESS_CONTROL, len, &buf);
	if (ret != SAA_OK)
		printk(KERN_ERR "%s() error, ret(2) = 0x%x\n", __func__, ret);

	return ret == SAA_OK ? 0 : -EIO;
}


int saa7164_api_modify_gpio(struct saa7164_dev *dev, u8 unitid,
	u8 pin, u8 state)
{
	int ret;
	tmComResGPIO_t t;

	dprintk(DBGLVL_API, "%s(0x%x, %d, %d)\n",
		__func__, unitid, pin, state);

	if ((pin > 7) || (state > 2))
		return SAA_ERR_BAD_PARAMETER;

	t.pin = pin;
	t.state = state;

	ret = saa7164_cmd_send(dev, unitid, SET_CUR,
		EXU_GPIO_CONTROL, sizeof(t), &t);
	if (ret != SAA_OK)
		printk(KERN_ERR "%s() error, ret = 0x%x\n",
			__func__, ret);

	return ret;
}

int saa7164_api_set_gpiobit(struct saa7164_dev *dev, u8 unitid,
	u8 pin)
{
	return saa7164_api_modify_gpio(dev, unitid, pin, 1);
}

int saa7164_api_clear_gpiobit(struct saa7164_dev *dev, u8 unitid,
	u8 pin)
{
	return saa7164_api_modify_gpio(dev, unitid, pin, 0);
}