summaryrefslogtreecommitdiff
path: root/drivers/media/video/pvrusb2/pvrusb2-i2c-core.c
blob: e72d5103e778c7d774eb4214e17950df5f0a8656 (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
/*
 *
 *
 *  Copyright (C) 2005 Mike Isely <isely@pobox.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
 *
 *  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., 59 Temple Place, Suite 330, Boston, MA  02111-1307  USA
 *
 */

#include <linux/i2c.h>
#include <media/ir-kbd-i2c.h>
#include "pvrusb2-i2c-core.h"
#include "pvrusb2-hdw-internal.h"
#include "pvrusb2-debug.h"
#include "pvrusb2-fx2-cmd.h"
#include "pvrusb2.h"

#define trace_i2c(...) pvr2_trace(PVR2_TRACE_I2C,__VA_ARGS__)

/*

  This module attempts to implement a compliant I2C adapter for the pvrusb2
  device.

*/

static unsigned int i2c_scan;
module_param(i2c_scan, int, S_IRUGO|S_IWUSR);
MODULE_PARM_DESC(i2c_scan,"scan i2c bus at insmod time");

static int ir_mode[PVR_NUM] = { [0 ... PVR_NUM-1] = 1 };
module_param_array(ir_mode, int, NULL, 0444);
MODULE_PARM_DESC(ir_mode,"specify: 0=disable IR reception, 1=normal IR");

static int pvr2_disable_ir_video;
module_param_named(disable_autoload_ir_video, pvr2_disable_ir_video,
		   int, S_IRUGO|S_IWUSR);
MODULE_PARM_DESC(disable_autoload_ir_video,
		 "1=do not try to autoload ir_video IR receiver");

static int pvr2_i2c_write(struct pvr2_hdw *hdw, /* Context */
			  u8 i2c_addr,      /* I2C address we're talking to */
			  u8 *data,         /* Data to write */
			  u16 length)       /* Size of data to write */
{
	/* Return value - default 0 means success */
	int ret;


	if (!data) length = 0;
	if (length > (sizeof(hdw->cmd_buffer) - 3)) {
		pvr2_trace(PVR2_TRACE_ERROR_LEGS,
			   "Killing an I2C write to %u that is too large"
			   " (desired=%u limit=%u)",
			   i2c_addr,
			   length,(unsigned int)(sizeof(hdw->cmd_buffer) - 3));
		return -ENOTSUPP;
	}

	LOCK_TAKE(hdw->ctl_lock);

	/* Clear the command buffer (likely to be paranoia) */
	memset(hdw->cmd_buffer, 0, sizeof(hdw->cmd_buffer));

	/* Set up command buffer for an I2C write */
	hdw->cmd_buffer[0] = FX2CMD_I2C_WRITE;      /* write prefix */
	hdw->cmd_buffer[1] = i2c_addr;  /* i2c addr of chip */
	hdw->cmd_buffer[2] = length;    /* length of what follows */
	if (length) memcpy(hdw->cmd_buffer + 3, data, length);

	/* Do the operation */
	ret = pvr2_send_request(hdw,
				hdw->cmd_buffer,
				length + 3,
				hdw->cmd_buffer,
				1);
	if (!ret) {
		if (hdw->cmd_buffer[0] != 8) {
			ret = -EIO;
			if (hdw->cmd_buffer[0] != 7) {
				trace_i2c("unexpected status"
					  " from i2_write[%d]: %d",
					  i2c_addr,hdw->cmd_buffer[0]);
			}
		}
	}

	LOCK_GIVE(hdw->ctl_lock);

	return ret;
}

static int pvr2_i2c_read(struct pvr2_hdw *hdw, /* Context */
			 u8 i2c_addr,       /* I2C address we're talking to */
			 u8 *data,          /* Data to write */
			 u16 dlen,          /* Size of data to write */
			 u8 *res,           /* Where to put data we read */
			 u16 rlen)          /* Amount of data to read */
{
	/* Return value - default 0 means success */
	int ret;


	if (!data) dlen = 0;
	if (dlen > (sizeof(hdw->cmd_buffer) - 4)) {
		pvr2_trace(PVR2_TRACE_ERROR_LEGS,
			   "Killing an I2C read to %u that has wlen too large"
			   " (desired=%u limit=%u)",
			   i2c_addr,
			   dlen,(unsigned int)(sizeof(hdw->cmd_buffer) - 4));
		return -ENOTSUPP;
	}
	if (res && (rlen > (sizeof(hdw->cmd_buffer) - 1))) {
		pvr2_trace(PVR2_TRACE_ERROR_LEGS,
			   "Killing an I2C read to %u that has rlen too large"
			   " (desired=%u limit=%u)",
			   i2c_addr,
			   rlen,(unsigned int)(sizeof(hdw->cmd_buffer) - 1));
		return -ENOTSUPP;
	}

	LOCK_TAKE(hdw->ctl_lock);

	/* Clear the command buffer (likely to be paranoia) */
	memset(hdw->cmd_buffer, 0, sizeof(hdw->cmd_buffer));

	/* Set up command buffer for an I2C write followed by a read */
	hdw->cmd_buffer[0] = FX2CMD_I2C_READ;  /* read prefix */
	hdw->cmd_buffer[1] = dlen;  /* arg length */
	hdw->cmd_buffer[2] = rlen;  /* answer length. Device will send one
				       more byte (status). */
	hdw->cmd_buffer[3] = i2c_addr;  /* i2c addr of chip */
	if (dlen) memcpy(hdw->cmd_buffer + 4, data, dlen);

	/* Do the operation */
	ret = pvr2_send_request(hdw,
				hdw->cmd_buffer,
				4 + dlen,
				hdw->cmd_buffer,
				rlen + 1);
	if (!ret) {
		if (hdw->cmd_buffer[0] != 8) {
			ret = -EIO;
			if (hdw->cmd_buffer[0] != 7) {
				trace_i2c("unexpected status"
					  " from i2_read[%d]: %d",
					  i2c_addr,hdw->cmd_buffer[0]);
			}
		}
	}

	/* Copy back the result */
	if (res && rlen) {
		if (ret) {
			/* Error, just blank out the return buffer */
			memset(res, 0, rlen);
		} else {
			memcpy(res, hdw->cmd_buffer + 1, rlen);
		}
	}

	LOCK_GIVE(hdw->ctl_lock);

	return ret;
}

/* This is the common low level entry point for doing I2C operations to the
   hardware. */
static int pvr2_i2c_basic_op(struct pvr2_hdw *hdw,
			     u8 i2c_addr,
			     u8 *wdata,
			     u16 wlen,
			     u8 *rdata,
			     u16 rlen)
{
	if (!rdata) rlen = 0;
	if (!wdata) wlen = 0;
	if (rlen || !wlen) {
		return pvr2_i2c_read(hdw,i2c_addr,wdata,wlen,rdata,rlen);
	} else {
		return pvr2_i2c_write(hdw,i2c_addr,wdata,wlen);
	}
}


/* This is a special entry point for cases of I2C transaction attempts to
   the IR receiver.  The implementation here simulates the IR receiver by
   issuing a command to the FX2 firmware and using that response to return
   what the real I2C receiver would have returned.  We use this for 24xxx
   devices, where the IR receiver chip has been removed and replaced with
   FX2 related logic. */
static int i2c_24xxx_ir(struct pvr2_hdw *hdw,
			u8 i2c_addr,u8 *wdata,u16 wlen,u8 *rdata,u16 rlen)
{
	u8 dat[4];
	unsigned int stat;

	if (!(rlen || wlen)) {
		/* This is a probe attempt.  Just let it succeed. */
		return 0;
	}

	/* We don't understand this kind of transaction */
	if ((wlen != 0) || (rlen == 0)) return -EIO;

	if (rlen < 3) {
		/* Mike Isely <isely@pobox.com> Appears to be a probe
		   attempt from lirc.  Just fill in zeroes and return.  If
		   we try instead to do the full transaction here, then bad
		   things seem to happen within the lirc driver module
		   (version 0.8.0-7 sources from Debian, when run under
		   vanilla 2.6.17.6 kernel) - and I don't have the patience
		   to chase it down. */
		if (rlen > 0) rdata[0] = 0;
		if (rlen > 1) rdata[1] = 0;
		return 0;
	}

	/* Issue a command to the FX2 to read the IR receiver. */
	LOCK_TAKE(hdw->ctl_lock); do {
		hdw->cmd_buffer[0] = FX2CMD_GET_IR_CODE;
		stat = pvr2_send_request(hdw,
					 hdw->cmd_buffer,1,
					 hdw->cmd_buffer,4);
		dat[0] = hdw->cmd_buffer[0];
		dat[1] = hdw->cmd_buffer[1];
		dat[2] = hdw->cmd_buffer[2];
		dat[3] = hdw->cmd_buffer[3];
	} while (0); LOCK_GIVE(hdw->ctl_lock);

	/* Give up if that operation failed. */
	if (stat != 0) return stat;

	/* Mangle the results into something that looks like the real IR
	   receiver. */
	rdata[2] = 0xc1;
	if (dat[0] != 1) {
		/* No code received. */
		rdata[0] = 0;
		rdata[1] = 0;
	} else {
		u16 val;
		/* Mash the FX2 firmware-provided IR code into something
		   that the normal i2c chip-level driver expects. */
		val = dat[1];
		val <<= 8;
		val |= dat[2];
		val >>= 1;
		val &= ~0x0003;
		val |= 0x8000;
		rdata[0] = (val >> 8) & 0xffu;
		rdata[1] = val & 0xffu;
	}

	return 0;
}

/* This is a special entry point that is entered if an I2C operation is
   attempted to a wm8775 chip on model 24xxx hardware.  Autodetect of this
   part doesn't work, but we know it is really there.  So let's look for
   the autodetect attempt and just return success if we see that. */
static int i2c_hack_wm8775(struct pvr2_hdw *hdw,
			   u8 i2c_addr,u8 *wdata,u16 wlen,u8 *rdata,u16 rlen)
{
	if (!(rlen || wlen)) {
		// This is a probe attempt.  Just let it succeed.
		return 0;
	}
	return pvr2_i2c_basic_op(hdw,i2c_addr,wdata,wlen,rdata,rlen);
}

/* This is an entry point designed to always fail any attempt to perform a
   transfer.  We use this to cause certain I2C addresses to not be
   probed. */
static int i2c_black_hole(struct pvr2_hdw *hdw,
			   u8 i2c_addr,u8 *wdata,u16 wlen,u8 *rdata,u16 rlen)
{
	return -EIO;
}

/* This is a special entry point that is entered if an I2C operation is
   attempted to a cx25840 chip on model 24xxx hardware.  This chip can
   sometimes wedge itself.  Worse still, when this happens msp3400 can
   falsely detect this part and then the system gets hosed up after msp3400
   gets confused and dies.  What we want to do here is try to keep msp3400
   away and also try to notice if the chip is wedged and send a warning to
   the system log. */
static int i2c_hack_cx25840(struct pvr2_hdw *hdw,
			    u8 i2c_addr,u8 *wdata,u16 wlen,u8 *rdata,u16 rlen)
{
	int ret;
	unsigned int subaddr;
	u8 wbuf[2];
	int state = hdw->i2c_cx25840_hack_state;

	if (!(rlen || wlen)) {
		// Probe attempt - always just succeed and don't bother the
		// hardware (this helps to make the state machine further
		// down somewhat easier).
		return 0;
	}

	if (state == 3) {
		return pvr2_i2c_basic_op(hdw,i2c_addr,wdata,wlen,rdata,rlen);
	}

	/* We're looking for the exact pattern where the revision register
	   is being read.  The cx25840 module will always look at the
	   revision register first.  Any other pattern of access therefore
	   has to be a probe attempt from somebody else so we'll reject it.
	   Normally we could just let each client just probe the part
	   anyway, but when the cx25840 is wedged, msp3400 will get a false
	   positive and that just screws things up... */

	if (wlen == 0) {
		switch (state) {
		case 1: subaddr = 0x0100; break;
		case 2: subaddr = 0x0101; break;
		default: goto fail;
		}
	} else if (wlen == 2) {
		subaddr = (wdata[0] << 8) | wdata[1];
		switch (subaddr) {
		case 0x0100: state = 1; break;
		case 0x0101: state = 2; break;
		default: goto fail;
		}
	} else {
		goto fail;
	}
	if (!rlen) goto success;
	state = 0;
	if (rlen != 1) goto fail;

	/* If we get to here then we have a legitimate read for one of the
	   two revision bytes, so pass it through. */
	wbuf[0] = subaddr >> 8;
	wbuf[1] = subaddr;
	ret = pvr2_i2c_basic_op(hdw,i2c_addr,wbuf,2,rdata,rlen);

	if ((ret != 0) || (*rdata == 0x04) || (*rdata == 0x0a)) {
		pvr2_trace(PVR2_TRACE_ERROR_LEGS,
			   "WARNING: Detected a wedged cx25840 chip;"
			   " the device will not work.");
		pvr2_trace(PVR2_TRACE_ERROR_LEGS,
			   "WARNING: Try power cycling the pvrusb2 device.");
		pvr2_trace(PVR2_TRACE_ERROR_LEGS,
			   "WARNING: Disabling further access to the device"
			   " to prevent other foul-ups.");
		// This blocks all further communication with the part.
		hdw->i2c_func[0x44] = NULL;
		pvr2_hdw_render_useless(hdw);
		goto fail;
	}

	/* Success! */
	pvr2_trace(PVR2_TRACE_CHIPS,"cx25840 appears to be OK.");
	state = 3;

 success:
	hdw->i2c_cx25840_hack_state = state;
	return 0;

 fail:
	hdw->i2c_cx25840_hack_state = state;
	return -EIO;
}

/* This is a very, very limited I2C adapter implementation.  We can only
   support what we actually know will work on the device... */
static int pvr2_i2c_xfer(struct i2c_adapter *i2c_adap,
			 struct i2c_msg msgs[],
			 int num)
{
	int ret = -ENOTSUPP;
	pvr2_i2c_func funcp = NULL;
	struct pvr2_hdw *hdw = (struct pvr2_hdw *)(i2c_adap->algo_data);

	if (!num) {
		ret = -EINVAL;
		goto done;
	}
	if (msgs[0].addr < PVR2_I2C_FUNC_CNT) {
		funcp = hdw->i2c_func[msgs[0].addr];
	}
	if (!funcp) {
		ret = -EIO;
		goto done;
	}

	if (num == 1) {
		if (msgs[0].flags & I2C_M_RD) {
			/* Simple read */
			u16 tcnt,bcnt,offs;
			if (!msgs[0].len) {
				/* Length == 0 read.  This is a probe. */
				if (funcp(hdw,msgs[0].addr,NULL,0,NULL,0)) {
					ret = -EIO;
					goto done;
				}
				ret = 1;
				goto done;
			}
			/* If the read is short enough we'll do the whole
			   thing atomically.  Otherwise we have no choice
			   but to break apart the reads. */
			tcnt = msgs[0].len;
			offs = 0;
			while (tcnt) {
				bcnt = tcnt;
				if (bcnt > sizeof(hdw->cmd_buffer)-1) {
					bcnt = sizeof(hdw->cmd_buffer)-1;
				}
				if (funcp(hdw,msgs[0].addr,NULL,0,
					  msgs[0].buf+offs,bcnt)) {
					ret = -EIO;
					goto done;
				}
				offs += bcnt;
				tcnt -= bcnt;
			}
			ret = 1;
			goto done;
		} else {
			/* Simple write */
			ret = 1;
			if (funcp(hdw,msgs[0].addr,
				  msgs[0].buf,msgs[0].len,NULL,0)) {
				ret = -EIO;
			}
			goto done;
		}
	} else if (num == 2) {
		if (msgs[0].addr != msgs[1].addr) {
			trace_i2c("i2c refusing 2 phase transfer with"
				  " conflicting target addresses");
			ret = -ENOTSUPP;
			goto done;
		}
		if ((!((msgs[0].flags & I2C_M_RD))) &&
		    (msgs[1].flags & I2C_M_RD)) {
			u16 tcnt,bcnt,wcnt,offs;
			/* Write followed by atomic read.  If the read
			   portion is short enough we'll do the whole thing
			   atomically.  Otherwise we have no choice but to
			   break apart the reads. */
			tcnt = msgs[1].len;
			wcnt = msgs[0].len;
			offs = 0;
			while (tcnt || wcnt) {
				bcnt = tcnt;
				if (bcnt > sizeof(hdw->cmd_buffer)-1) {
					bcnt = sizeof(hdw->cmd_buffer)-1;
				}
				if (funcp(hdw,msgs[0].addr,
					  msgs[0].buf,wcnt,
					  msgs[1].buf+offs,bcnt)) {
					ret = -EIO;
					goto done;
				}
				offs += bcnt;
				tcnt -= bcnt;
				wcnt = 0;
			}
			ret = 2;
			goto done;
		} else {
			trace_i2c("i2c refusing complex transfer"
				  " read0=%d read1=%d",
				  (msgs[0].flags & I2C_M_RD),
				  (msgs[1].flags & I2C_M_RD));
		}
	} else {
		trace_i2c("i2c refusing %d phase transfer",num);
	}

 done:
	if (pvrusb2_debug & PVR2_TRACE_I2C_TRAF) {
		unsigned int idx,offs,cnt;
		for (idx = 0; idx < num; idx++) {
			cnt = msgs[idx].len;
			printk(KERN_INFO
			       "pvrusb2 i2c xfer %u/%u:"
			       " addr=0x%x len=%d %s",
			       idx+1,num,
			       msgs[idx].addr,
			       cnt,
			       (msgs[idx].flags & I2C_M_RD ?
				"read" : "write"));
			if ((ret > 0) || !(msgs[idx].flags & I2C_M_RD)) {
				if (cnt > 8) cnt = 8;
				printk(" [");
				for (offs = 0; offs < (cnt>8?8:cnt); offs++) {
					if (offs) printk(" ");
					printk("%02x",msgs[idx].buf[offs]);
				}
				if (offs < cnt) printk(" ...");
				printk("]");
			}
			if (idx+1 == num) {
				printk(" result=%d",ret);
			}
			printk("\n");
		}
		if (!num) {
			printk(KERN_INFO
			       "pvrusb2 i2c xfer null transfer result=%d\n",
			       ret);
		}
	}
	return ret;
}

static u32 pvr2_i2c_functionality(struct i2c_adapter *adap)
{
	return I2C_FUNC_SMBUS_EMUL | I2C_FUNC_I2C;
}

static struct i2c_algorithm pvr2_i2c_algo_template = {
	.master_xfer   = pvr2_i2c_xfer,
	.functionality = pvr2_i2c_functionality,
};

static struct i2c_adapter pvr2_i2c_adap_template = {
	.owner         = THIS_MODULE,
	.class	       = 0,
};


/* Return true if device exists at given address */
static int do_i2c_probe(struct pvr2_hdw *hdw, int addr)
{
	struct i2c_msg msg[1];
	int rc;
	msg[0].addr = 0;
	msg[0].flags = I2C_M_RD;
	msg[0].len = 0;
	msg[0].buf = NULL;
	msg[0].addr = addr;
	rc = i2c_transfer(&hdw->i2c_adap, msg, ARRAY_SIZE(msg));
	return rc == 1;
}

static void do_i2c_scan(struct pvr2_hdw *hdw)
{
	int i;
	printk(KERN_INFO "%s: i2c scan beginning\n", hdw->name);
	for (i = 0; i < 128; i++) {
		if (do_i2c_probe(hdw, i)) {
			printk(KERN_INFO "%s: i2c scan: found device @ 0x%x\n",
			       hdw->name, i);
		}
	}
	printk(KERN_INFO "%s: i2c scan done.\n", hdw->name);
}

static void pvr2_i2c_register_ir(struct pvr2_hdw *hdw)
{
	struct i2c_board_info info;
	struct IR_i2c_init_data *init_data = &hdw->ir_init_data;
	if (pvr2_disable_ir_video) {
		pvr2_trace(PVR2_TRACE_INFO,
			   "Automatic binding of ir_video has been disabled.");
		return;
	}
	memset(&info, 0, sizeof(struct i2c_board_info));
	switch (hdw->ir_scheme_active) {
	case PVR2_IR_SCHEME_24XXX: /* FX2-controlled IR */
	case PVR2_IR_SCHEME_29XXX: /* Original 29xxx device */
		init_data->ir_codes              = RC_MAP_HAUPPAUGE;
		init_data->internal_get_key_func = IR_KBD_GET_KEY_HAUP;
		init_data->type                  = RC_TYPE_RC5;
		init_data->name                  = hdw->hdw_desc->description;
		init_data->polling_interval      = 100; /* ms From ir-kbd-i2c */
		/* IR Receiver */
		info.addr          = 0x18;
		info.platform_data = init_data;
		strlcpy(info.type, "ir_video", I2C_NAME_SIZE);
		pvr2_trace(PVR2_TRACE_INFO, "Binding %s to i2c address 0x%02x.",
			   info.type, info.addr);
		i2c_new_device(&hdw->i2c_adap, &info);
		break;
	case PVR2_IR_SCHEME_ZILOG:     /* HVR-1950 style */
	case PVR2_IR_SCHEME_24XXX_MCE: /* 24xxx MCE device */
		init_data->ir_codes              = RC_MAP_HAUPPAUGE;
		init_data->internal_get_key_func = IR_KBD_GET_KEY_HAUP_XVR;
		init_data->type                  = RC_TYPE_RC5;
		init_data->name                  = hdw->hdw_desc->description;
		/* IR Receiver */
		info.addr          = 0x71;
		info.platform_data = init_data;
		strlcpy(info.type, "ir_rx_z8f0811_haup", I2C_NAME_SIZE);
		pvr2_trace(PVR2_TRACE_INFO, "Binding %s to i2c address 0x%02x.",
			   info.type, info.addr);
		i2c_new_device(&hdw->i2c_adap, &info);
		/* IR Trasmitter */
		info.addr          = 0x70;
		info.platform_data = init_data;
		strlcpy(info.type, "ir_tx_z8f0811_haup", I2C_NAME_SIZE);
		pvr2_trace(PVR2_TRACE_INFO, "Binding %s to i2c address 0x%02x.",
			   info.type, info.addr);
		i2c_new_device(&hdw->i2c_adap, &info);
		break;
	default:
		/* The device either doesn't support I2C-based IR or we
		   don't know (yet) how to operate IR on the device. */
		break;
	}
}

void pvr2_i2c_core_init(struct pvr2_hdw *hdw)
{
	unsigned int idx;

	/* The default action for all possible I2C addresses is just to do
	   the transfer normally. */
	for (idx = 0; idx < PVR2_I2C_FUNC_CNT; idx++) {
		hdw->i2c_func[idx] = pvr2_i2c_basic_op;
	}

	/* However, deal with various special cases for 24xxx hardware. */
	if (ir_mode[hdw->unit_number] == 0) {
		printk(KERN_INFO "%s: IR disabled\n",hdw->name);
		hdw->i2c_func[0x18] = i2c_black_hole;
	} else if (ir_mode[hdw->unit_number] == 1) {
		if (hdw->ir_scheme_active == PVR2_IR_SCHEME_24XXX) {
			/* Set up translation so that our IR looks like a
			   29xxx device */
			hdw->i2c_func[0x18] = i2c_24xxx_ir;
		}
	}
	if (hdw->hdw_desc->flag_has_cx25840) {
		hdw->i2c_func[0x44] = i2c_hack_cx25840;
	}
	if (hdw->hdw_desc->flag_has_wm8775) {
		hdw->i2c_func[0x1b] = i2c_hack_wm8775;
	}

	// Configure the adapter and set up everything else related to it.
	memcpy(&hdw->i2c_adap,&pvr2_i2c_adap_template,sizeof(hdw->i2c_adap));
	memcpy(&hdw->i2c_algo,&pvr2_i2c_algo_template,sizeof(hdw->i2c_algo));
	strlcpy(hdw->i2c_adap.name,hdw->name,sizeof(hdw->i2c_adap.name));
	hdw->i2c_adap.dev.parent = &hdw->usb_dev->dev;
	hdw->i2c_adap.algo = &hdw->i2c_algo;
	hdw->i2c_adap.algo_data = hdw;
	hdw->i2c_linked = !0;
	i2c_set_adapdata(&hdw->i2c_adap, &hdw->v4l2_dev);
	i2c_add_adapter(&hdw->i2c_adap);
	if (hdw->i2c_func[0x18] == i2c_24xxx_ir) {
		/* Probe for a different type of IR receiver on this
		   device.  This is really the only way to differentiate
		   older 24xxx devices from 24xxx variants that include an
		   IR blaster.  If the IR blaster is present, the IR
		   receiver is part of that chip and thus we must disable
		   the emulated IR receiver. */
		if (do_i2c_probe(hdw, 0x71)) {
			pvr2_trace(PVR2_TRACE_INFO,
				   "Device has newer IR hardware;"
				   " disabling unneeded virtual IR device");
			hdw->i2c_func[0x18] = NULL;
			/* Remember that this is a different device... */
			hdw->ir_scheme_active = PVR2_IR_SCHEME_24XXX_MCE;
		}
	}
	if (i2c_scan) do_i2c_scan(hdw);

	pvr2_i2c_register_ir(hdw);
}

void pvr2_i2c_core_done(struct pvr2_hdw *hdw)
{
	if (hdw->i2c_linked) {
		i2c_del_adapter(&hdw->i2c_adap);
		hdw->i2c_linked = 0;
	}
}

/*
  Stuff for Emacs to see, in order to encourage consistent editing style:
  *** Local Variables: ***
  *** mode: c ***
  *** fill-column: 75 ***
  *** tab-width: 8 ***
  *** c-basic-offset: 8 ***
  *** End: ***
  */