summaryrefslogtreecommitdiffstats
path: root/drivers/media/i2c/ir-kbd-i2c.c
blob: e8119ad0bc71dc38de4c719a121034e357e2c3d9 (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
908
909
910
911
912
913
914
915
916
917
918
919
920
921
922
923
924
925
926
927
928
929
930
931
932
933
934
935
936
937
938
939
940
941
942
943
944
945
946
947
948
949
950
951
952
953
954
955
// SPDX-License-Identifier: GPL-2.0-or-later
/*
 *
 * keyboard input driver for i2c IR remote controls
 *
 * Copyright (c) 2000-2003 Gerd Knorr <kraxel@bytesex.org>
 * modified for PixelView (BT878P+W/FM) by
 *      Michal Kochanowicz <mkochano@pld.org.pl>
 *      Christoph Bartelmus <lirc@bartelmus.de>
 * modified for KNC ONE TV Station/Anubis Typhoon TView Tuner by
 *      Ulrich Mueller <ulrich.mueller42@web.de>
 * modified for em2820 based USB TV tuners by
 *      Markus Rechberger <mrechberger@gmail.com>
 * modified for DViCO Fusion HDTV 5 RT GOLD by
 *      Chaogui Zhang <czhang1974@gmail.com>
 * modified for MSI TV@nywhere Plus by
 *      Henry Wong <henry@stuffedcow.net>
 *      Mark Schultz <n9xmj@yahoo.com>
 *      Brian Rogers <brian_rogers@comcast.net>
 * modified for AVerMedia Cardbus by
 *      Oldrich Jedlicka <oldium.pro@seznam.cz>
 * Zilog Transmitter portions/ideas were derived from GPLv2+ sources:
 *  - drivers/char/pctv_zilogir.[ch] from Hauppauge Broadway product
 *	Copyright 2011 Hauppauge Computer works
 *  - drivers/staging/media/lirc/lirc_zilog.c
 *	Copyright (c) 2000 Gerd Knorr <kraxel@goldbach.in-berlin.de>
 *	Michal Kochanowicz <mkochano@pld.org.pl>
 *	Christoph Bartelmus <lirc@bartelmus.de>
 *	Ulrich Mueller <ulrich.mueller42@web.de>
 *	Stefan Jahn <stefan@lkcc.org>
 *	Jerome Brock <jbrock@users.sourceforge.net>
 *	Thomas Reitmayr (treitmayr@yahoo.com)
 *	Mark Weaver <mark@npsl.co.uk>
 *	Jarod Wilson <jarod@redhat.com>
 *	Copyright (C) 2011 Andy Walls <awalls@md.metrocast.net>
 */

#include <asm/unaligned.h>
#include <linux/module.h>
#include <linux/init.h>
#include <linux/kernel.h>
#include <linux/string.h>
#include <linux/timer.h>
#include <linux/delay.h>
#include <linux/errno.h>
#include <linux/slab.h>
#include <linux/i2c.h>
#include <linux/workqueue.h>

#include <media/rc-core.h>
#include <media/i2c/ir-kbd-i2c.h>

#define FLAG_TX		1
#define FLAG_HDPVR	2

static bool enable_hdpvr;
module_param(enable_hdpvr, bool, 0644);

static int get_key_haup_common(struct IR_i2c *ir, enum rc_proto *protocol,
			       u32 *scancode, u8 *ptoggle, int size)
{
	unsigned char buf[6];
	int start, range, toggle, dev, code, ircode, vendor;

	/* poll IR chip */
	if (size != i2c_master_recv(ir->c, buf, size))
		return -EIO;

	if (buf[0] & 0x80) {
		int offset = (size == 6) ? 3 : 0;

		/* split rc5 data block ... */
		start  = (buf[offset] >> 7) &    1;
		range  = (buf[offset] >> 6) &    1;
		toggle = (buf[offset] >> 5) &    1;
		dev    =  buf[offset]       & 0x1f;
		code   = (buf[offset+1] >> 2) & 0x3f;

		/* rc5 has two start bits
		 * the first bit must be one
		 * the second bit defines the command range:
		 * 1 = 0-63, 0 = 64 - 127
		 */
		if (!start)
			/* no key pressed */
			return 0;

		/* filter out invalid key presses */
		ircode = (start << 12) | (toggle << 11) | (dev << 6) | code;
		if ((ircode & 0x1fff) == 0x1fff)
			return 0;

		if (!range)
			code += 64;

		dev_dbg(&ir->rc->dev,
			"ir hauppauge (rc5): s%d r%d t%d dev=%d code=%d\n",
			start, range, toggle, dev, code);

		*protocol = RC_PROTO_RC5;
		*scancode = RC_SCANCODE_RC5(dev, code);
		*ptoggle = toggle;

		return 1;
	} else if (size == 6 && (buf[0] & 0x40)) {
		code = buf[4];
		dev = buf[3];
		vendor = get_unaligned_be16(buf + 1);

		if (vendor == 0x800f) {
			*ptoggle = (dev & 0x80) != 0;
			*protocol = RC_PROTO_RC6_MCE;
			dev &= 0x7f;
			dev_dbg(&ir->rc->dev,
				"ir hauppauge (rc6-mce): t%d vendor=%d dev=%d code=%d\n",
				*ptoggle, vendor, dev, code);
		} else {
			*ptoggle = 0;
			*protocol = RC_PROTO_RC6_6A_32;
			dev_dbg(&ir->rc->dev,
				"ir hauppauge (rc6-6a-32): vendor=%d dev=%d code=%d\n",
				vendor, dev, code);
		}

		*scancode = RC_SCANCODE_RC6_6A(vendor, dev, code);

		return 1;
	}

	return 0;
}

static int get_key_haup(struct IR_i2c *ir, enum rc_proto *protocol,
			u32 *scancode, u8 *toggle)
{
	return get_key_haup_common(ir, protocol, scancode, toggle, 3);
}

static int get_key_haup_xvr(struct IR_i2c *ir, enum rc_proto *protocol,
			    u32 *scancode, u8 *toggle)
{
	int ret;
	unsigned char buf[1] = { 0 };

	/*
	 * This is the same apparent "are you ready?" poll command observed
	 * watching Windows driver traffic and implemented in lirc_zilog. With
	 * this added, we get far saner remote behavior with z8 chips on usb
	 * connected devices, even with the default polling interval of 100ms.
	 */
	ret = i2c_master_send(ir->c, buf, 1);
	if (ret != 1)
		return (ret < 0) ? ret : -EINVAL;

	return get_key_haup_common(ir, protocol, scancode, toggle, 6);
}

static int get_key_pixelview(struct IR_i2c *ir, enum rc_proto *protocol,
			     u32 *scancode, u8 *toggle)
{
	int rc;
	unsigned char b;

	/* poll IR chip */
	rc = i2c_master_recv(ir->c, &b, 1);
	if (rc != 1) {
		dev_dbg(&ir->rc->dev, "read error\n");
		if (rc < 0)
			return rc;
		return -EIO;
	}

	*protocol = RC_PROTO_OTHER;
	*scancode = b;
	*toggle = 0;
	return 1;
}

static int get_key_fusionhdtv(struct IR_i2c *ir, enum rc_proto *protocol,
			      u32 *scancode, u8 *toggle)
{
	int rc;
	unsigned char buf[4];

	/* poll IR chip */
	rc = i2c_master_recv(ir->c, buf, 4);
	if (rc != 4) {
		dev_dbg(&ir->rc->dev, "read error\n");
		if (rc < 0)
			return rc;
		return -EIO;
	}

	if (buf[0] != 0 || buf[1] != 0 || buf[2] != 0 || buf[3] != 0)
		dev_dbg(&ir->rc->dev, "%s: %*ph\n", __func__, 4, buf);

	/* no key pressed or signal from other ir remote */
	if(buf[0] != 0x1 ||  buf[1] != 0xfe)
		return 0;

	*protocol = RC_PROTO_UNKNOWN;
	*scancode = buf[2];
	*toggle = 0;
	return 1;
}

static int get_key_knc1(struct IR_i2c *ir, enum rc_proto *protocol,
			u32 *scancode, u8 *toggle)
{
	int rc;
	unsigned char b;

	/* poll IR chip */
	rc = i2c_master_recv(ir->c, &b, 1);
	if (rc != 1) {
		dev_dbg(&ir->rc->dev, "read error\n");
		if (rc < 0)
			return rc;
		return -EIO;
	}

	/* it seems that 0xFE indicates that a button is still hold
	   down, while 0xff indicates that no button is hold
	   down. 0xfe sequences are sometimes interrupted by 0xFF */

	dev_dbg(&ir->rc->dev, "key %02x\n", b);

	if (b == 0xff)
		return 0;

	if (b == 0xfe)
		/* keep old data */
		return 1;

	*protocol = RC_PROTO_UNKNOWN;
	*scancode = b;
	*toggle = 0;
	return 1;
}

static int get_key_avermedia_cardbus(struct IR_i2c *ir, enum rc_proto *protocol,
				     u32 *scancode, u8 *toggle)
{
	unsigned char subaddr, key, keygroup;
	struct i2c_msg msg[] = { { .addr = ir->c->addr, .flags = 0,
				   .buf = &subaddr, .len = 1},
				 { .addr = ir->c->addr, .flags = I2C_M_RD,
				  .buf = &key, .len = 1} };
	subaddr = 0x0d;
	if (2 != i2c_transfer(ir->c->adapter, msg, 2)) {
		dev_dbg(&ir->rc->dev, "read error\n");
		return -EIO;
	}

	if (key == 0xff)
		return 0;

	subaddr = 0x0b;
	msg[1].buf = &keygroup;
	if (2 != i2c_transfer(ir->c->adapter, msg, 2)) {
		dev_dbg(&ir->rc->dev, "read error\n");
		return -EIO;
	}

	if (keygroup == 0xff)
		return 0;

	dev_dbg(&ir->rc->dev, "read key 0x%02x/0x%02x\n", key, keygroup);
	if (keygroup < 2 || keygroup > 4) {
		dev_warn(&ir->rc->dev, "warning: invalid key group 0x%02x for key 0x%02x\n",
			 keygroup, key);
	}
	key |= (keygroup & 1) << 6;

	*protocol = RC_PROTO_UNKNOWN;
	*scancode = key;
	if (ir->c->addr == 0x41) /* AVerMedia EM78P153 */
		*scancode |= keygroup << 8;
	*toggle = 0;
	return 1;
}

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

static int ir_key_poll(struct IR_i2c *ir)
{
	enum rc_proto protocol;
	u32 scancode;
	u8 toggle;
	int rc;

	dev_dbg(&ir->rc->dev, "%s\n", __func__);
	rc = ir->get_key(ir, &protocol, &scancode, &toggle);
	if (rc < 0) {
		dev_warn(&ir->rc->dev, "error %d\n", rc);
		return rc;
	}

	if (rc) {
		dev_dbg(&ir->rc->dev, "%s: proto = 0x%04x, scancode = 0x%08x\n",
			__func__, protocol, scancode);
		rc_keydown(ir->rc, protocol, scancode, toggle);
	}
	return 0;
}

static void ir_work(struct work_struct *work)
{
	int rc;
	struct IR_i2c *ir = container_of(work, struct IR_i2c, work.work);

	/*
	 * If the transmit code is holding the lock, skip polling for
	 * IR, we'll get it to it next time round
	 */
	if (mutex_trylock(&ir->lock)) {
		rc = ir_key_poll(ir);
		mutex_unlock(&ir->lock);
		if (rc == -ENODEV) {
			rc_unregister_device(ir->rc);
			ir->rc = NULL;
			return;
		}
	}

	schedule_delayed_work(&ir->work, msecs_to_jiffies(ir->polling_interval));
}

static int ir_open(struct rc_dev *dev)
{
	struct IR_i2c *ir = dev->priv;

	schedule_delayed_work(&ir->work, 0);

	return 0;
}

static void ir_close(struct rc_dev *dev)
{
	struct IR_i2c *ir = dev->priv;

	cancel_delayed_work_sync(&ir->work);
}

/* Zilog Transmit Interface */
#define XTAL_FREQ		18432000

#define ZILOG_SEND		0x80
#define ZILOG_UIR_END		0x40
#define ZILOG_INIT_END		0x20
#define ZILOG_LIR_END		0x10

#define ZILOG_STATUS_OK		0x80
#define ZILOG_STATUS_TX		0x40
#define ZILOG_STATUS_SET	0x20

/*
 * As you can see here, very few different lengths of pulse and space
 * can be encoded. This means that the hardware does not work well with
 * recorded IR. It's best to work with generated IR, like from ir-ctl or
 * the in-kernel encoders.
 */
struct code_block {
	u8	length;
	u16	pulse[7];	/* not aligned */
	u8	carrier_pulse;
	u8	carrier_space;
	u16	space[8];	/* not aligned */
	u8	codes[61];
	u8	csum[2];
} __packed;

static int send_data_block(struct IR_i2c *ir, int cmd,
			   struct code_block *code_block)
{
	int i, j, ret;
	u8 buf[5], *p;

	p = &code_block->length;
	for (i = 0; p < code_block->csum; i++)
		code_block->csum[i & 1] ^= *p++;

	p = &code_block->length;

	for (i = 0; i < sizeof(*code_block);) {
		int tosend = sizeof(*code_block) - i;

		if (tosend > 4)
			tosend = 4;
		buf[0] = i + 1;
		for (j = 0; j < tosend; ++j)
			buf[1 + j] = p[i + j];
		dev_dbg(&ir->rc->dev, "%*ph", tosend + 1, buf);
		ret = i2c_master_send(ir->tx_c, buf, tosend + 1);
		if (ret != tosend + 1) {
			dev_dbg(&ir->rc->dev,
				"i2c_master_send failed with %d\n", ret);
			return ret < 0 ? ret : -EIO;
		}
		i += tosend;
	}

	buf[0] = 0;
	buf[1] = cmd;
	ret = i2c_master_send(ir->tx_c, buf, 2);
	if (ret != 2) {
		dev_err(&ir->rc->dev, "i2c_master_send failed with %d\n", ret);
		return ret < 0 ? ret : -EIO;
	}

	usleep_range(2000, 5000);

	ret = i2c_master_send(ir->tx_c, buf, 1);
	if (ret != 1) {
		dev_err(&ir->rc->dev, "i2c_master_send failed with %d\n", ret);
		return ret < 0 ? ret : -EIO;
	}

	return 0;
}

static int zilog_init(struct IR_i2c *ir)
{
	struct code_block code_block = { .length = sizeof(code_block) };
	u8 buf[4];
	int ret;

	put_unaligned_be16(0x1000, &code_block.pulse[3]);

	ret = send_data_block(ir, ZILOG_INIT_END, &code_block);
	if (ret)
		return ret;

	ret = i2c_master_recv(ir->tx_c, buf, 4);
	if (ret != 4) {
		dev_err(&ir->c->dev, "failed to retrieve firmware version: %d\n",
			ret);
		return ret < 0 ? ret : -EIO;
	}

	dev_info(&ir->c->dev, "Zilog/Hauppauge IR blaster firmware version %d.%d.%d\n",
		 buf[1], buf[2], buf[3]);

	return 0;
}

/*
 * If the last slot for pulse is the same as the current slot for pulse,
 * then use slot no 7.
 */
static void copy_codes(u8 *dst, u8 *src, unsigned int count)
{
	u8 c, last = 0xff;

	while (count--) {
		c = *src++;
		if ((c & 0xf0) == last) {
			*dst++ = 0x70 | (c & 0xf);
		} else {
			*dst++ = c;
			last = c & 0xf0;
		}
	}
}

/*
 * When looking for repeats, we don't care about the trailing space. This
 * is set to the shortest possible anyway.
 */
static int cmp_no_trail(u8 *a, u8 *b, unsigned int count)
{
	while (--count) {
		if (*a++ != *b++)
			return 1;
	}

	return (*a & 0xf0) - (*b & 0xf0);
}

static int find_slot(u16 *array, unsigned int size, u16 val)
{
	int i;

	for (i = 0; i < size; i++) {
		if (get_unaligned_be16(&array[i]) == val) {
			return i;
		} else if (!array[i]) {
			put_unaligned_be16(val, &array[i]);
			return i;
		}
	}

	return -1;
}

static int zilog_ir_format(struct rc_dev *rcdev, unsigned int *txbuf,
			   unsigned int count, struct code_block *code_block)
{
	struct IR_i2c *ir = rcdev->priv;
	int rep, i, l, p = 0, s, c = 0;
	bool repeating;
	u8 codes[174];

	code_block->carrier_pulse = DIV_ROUND_CLOSEST(
			ir->duty_cycle * XTAL_FREQ / 1000, ir->carrier);
	code_block->carrier_space = DIV_ROUND_CLOSEST(
			(100 - ir->duty_cycle) * XTAL_FREQ / 1000, ir->carrier);

	for (i = 0; i < count; i++) {
		if (c >= ARRAY_SIZE(codes) - 1) {
			dev_warn(&rcdev->dev, "IR too long, cannot transmit\n");
			return -EINVAL;
		}

		/*
		 * Lengths more than 142220us cannot be encoded; also
		 * this checks for multiply overflow
		 */
		if (txbuf[i] > 142220)
			return -EINVAL;

		l = DIV_ROUND_CLOSEST((XTAL_FREQ / 1000) * txbuf[i], 40000);

		if (i & 1) {
			s = find_slot(code_block->space,
				      ARRAY_SIZE(code_block->space), l);
			if (s == -1) {
				dev_warn(&rcdev->dev, "Too many different lengths spaces, cannot transmit");
				return -EINVAL;
			}

			/* We have a pulse and space */
			codes[c++] = (p << 4) | s;
		} else {
			p = find_slot(code_block->pulse,
				      ARRAY_SIZE(code_block->pulse), l);
			if (p == -1) {
				dev_warn(&rcdev->dev, "Too many different lengths pulses, cannot transmit");
				return -EINVAL;
			}
		}
	}

	/* We have to encode the trailing pulse. Find the shortest space */
	s = 0;
	for (i = 1; i < ARRAY_SIZE(code_block->space); i++) {
		u16 d = get_unaligned_be16(&code_block->space[i]);

		if (get_unaligned_be16(&code_block->space[s]) > d)
			s = i;
	}

	codes[c++] = (p << 4) | s;

	dev_dbg(&rcdev->dev, "generated %d codes\n", c);

	/*
	 * Are the last N codes (so pulse + space) repeating 3 times?
	 * if so we can shorten the codes list and use code 0xc0 to repeat
	 * them.
	 */
	repeating = false;

	for (rep = c / 3; rep >= 1; rep--) {
		if (!memcmp(&codes[c - rep * 3], &codes[c - rep * 2], rep) &&
		    !cmp_no_trail(&codes[c - rep], &codes[c - rep * 2], rep)) {
			repeating = true;
			break;
		}
	}

	if (repeating) {
		/* first copy any leading non-repeating */
		int leading = c - rep * 3;

		if (leading >= ARRAY_SIZE(code_block->codes) - 3 - rep) {
			dev_warn(&rcdev->dev, "IR too long, cannot transmit\n");
			return -EINVAL;
		}

		dev_dbg(&rcdev->dev, "found trailing %d repeat\n", rep);
		copy_codes(code_block->codes, codes, leading);
		code_block->codes[leading] = 0x82;
		copy_codes(code_block->codes + leading + 1, codes + leading,
			   rep);
		c = leading + 1 + rep;
		code_block->codes[c++] = 0xc0;
	} else {
		if (c >= ARRAY_SIZE(code_block->codes) - 3) {
			dev_warn(&rcdev->dev, "IR too long, cannot transmit\n");
			return -EINVAL;
		}

		dev_dbg(&rcdev->dev, "found no trailing repeat\n");
		code_block->codes[0] = 0x82;
		copy_codes(code_block->codes + 1, codes, c);
		c++;
		code_block->codes[c++] = 0xc4;
	}

	while (c < ARRAY_SIZE(code_block->codes))
		code_block->codes[c++] = 0x83;

	return 0;
}

static int zilog_tx(struct rc_dev *rcdev, unsigned int *txbuf,
		    unsigned int count)
{
	struct IR_i2c *ir = rcdev->priv;
	struct code_block code_block = { .length = sizeof(code_block) };
	u8 buf[2];
	int ret, i;

	ret = zilog_ir_format(rcdev, txbuf, count, &code_block);
	if (ret)
		return ret;

	ret = mutex_lock_interruptible(&ir->lock);
	if (ret)
		return ret;

	ret = send_data_block(ir, ZILOG_UIR_END, &code_block);
	if (ret)
		goto out_unlock;

	ret = i2c_master_recv(ir->tx_c, buf, 1);
	if (ret != 1) {
		dev_err(&ir->rc->dev, "i2c_master_recv failed with %d\n", ret);
		goto out_unlock;
	}

	dev_dbg(&ir->rc->dev, "code set status: %02x\n", buf[0]);

	if (buf[0] != (ZILOG_STATUS_OK | ZILOG_STATUS_SET)) {
		dev_err(&ir->rc->dev, "unexpected IR TX response %02x\n",
			buf[0]);
		ret = -EIO;
		goto out_unlock;
	}

	buf[0] = 0x00;
	buf[1] = ZILOG_SEND;

	ret = i2c_master_send(ir->tx_c, buf, 2);
	if (ret != 2) {
		dev_err(&ir->rc->dev, "i2c_master_send failed with %d\n", ret);
		if (ret >= 0)
			ret = -EIO;
		goto out_unlock;
	}

	dev_dbg(&ir->rc->dev, "send command sent\n");

	/*
	 * This bit NAKs until the device is ready, so we retry it
	 * sleeping a bit each time.  This seems to be what the windows
	 * driver does, approximately.
	 * Try for up to 1s.
	 */
	for (i = 0; i < 20; ++i) {
		set_current_state(TASK_UNINTERRUPTIBLE);
		schedule_timeout(msecs_to_jiffies(50));
		ret = i2c_master_send(ir->tx_c, buf, 1);
		if (ret == 1)
			break;
		dev_dbg(&ir->rc->dev,
			"NAK expected: i2c_master_send failed with %d (try %d)\n",
			ret, i + 1);
	}

	if (ret != 1) {
		dev_err(&ir->rc->dev,
			"IR TX chip never got ready: last i2c_master_send failed with %d\n",
			ret);
		if (ret >= 0)
			ret = -EIO;
		goto out_unlock;
	}

	i = i2c_master_recv(ir->tx_c, buf, 1);
	if (i != 1) {
		dev_err(&ir->rc->dev, "i2c_master_recv failed with %d\n", ret);
		ret = -EIO;
		goto out_unlock;
	} else if (buf[0] != ZILOG_STATUS_OK) {
		dev_err(&ir->rc->dev, "unexpected IR TX response #2: %02x\n",
			buf[0]);
		ret = -EIO;
		goto out_unlock;
	}
	dev_dbg(&ir->rc->dev, "transmit complete\n");

	/* Oh good, it worked */
	ret = count;
out_unlock:
	mutex_unlock(&ir->lock);

	return ret;
}

static int zilog_tx_carrier(struct rc_dev *dev, u32 carrier)
{
	struct IR_i2c *ir = dev->priv;

	if (carrier > 500000 || carrier < 20000)
		return -EINVAL;

	ir->carrier = carrier;

	return 0;
}

static int zilog_tx_duty_cycle(struct rc_dev *dev, u32 duty_cycle)
{
	struct IR_i2c *ir = dev->priv;

	ir->duty_cycle = duty_cycle;

	return 0;
}

static int ir_probe(struct i2c_client *client, const struct i2c_device_id *id)
{
	char *ir_codes = NULL;
	const char *name = NULL;
	u64 rc_proto = RC_PROTO_BIT_UNKNOWN;
	struct IR_i2c *ir;
	struct rc_dev *rc = NULL;
	struct i2c_adapter *adap = client->adapter;
	unsigned short addr = client->addr;
	bool probe_tx = (id->driver_data & FLAG_TX) != 0;
	int err;

	if ((id->driver_data & FLAG_HDPVR) && !enable_hdpvr) {
		dev_err(&client->dev, "IR for HDPVR is known to cause problems during recording, use enable_hdpvr modparam to enable\n");
		return -ENODEV;
	}

	ir = devm_kzalloc(&client->dev, sizeof(*ir), GFP_KERNEL);
	if (!ir)
		return -ENOMEM;

	ir->c = client;
	ir->polling_interval = DEFAULT_POLLING_INTERVAL;
	i2c_set_clientdata(client, ir);

	switch(addr) {
	case 0x64:
		name        = "Pixelview";
		ir->get_key = get_key_pixelview;
		rc_proto    = RC_PROTO_BIT_OTHER;
		ir_codes    = RC_MAP_EMPTY;
		break;
	case 0x18:
	case 0x1f:
	case 0x1a:
		name        = "Hauppauge";
		ir->get_key = get_key_haup;
		rc_proto    = RC_PROTO_BIT_RC5;
		ir_codes    = RC_MAP_HAUPPAUGE;
		break;
	case 0x30:
		name        = "KNC One";
		ir->get_key = get_key_knc1;
		rc_proto    = RC_PROTO_BIT_OTHER;
		ir_codes    = RC_MAP_EMPTY;
		break;
	case 0x6b:
		name        = "FusionHDTV";
		ir->get_key = get_key_fusionhdtv;
		rc_proto    = RC_PROTO_BIT_UNKNOWN;
		ir_codes    = RC_MAP_FUSIONHDTV_MCE;
		break;
	case 0x40:
		name        = "AVerMedia Cardbus remote";
		ir->get_key = get_key_avermedia_cardbus;
		rc_proto    = RC_PROTO_BIT_OTHER;
		ir_codes    = RC_MAP_AVERMEDIA_CARDBUS;
		break;
	case 0x41:
		name        = "AVerMedia EM78P153";
		ir->get_key = get_key_avermedia_cardbus;
		rc_proto    = RC_PROTO_BIT_OTHER;
		/* RM-KV remote, seems to be same as RM-K6 */
		ir_codes    = RC_MAP_AVERMEDIA_M733A_RM_K6;
		break;
	case 0x71:
		name        = "Hauppauge/Zilog Z8";
		ir->get_key = get_key_haup_xvr;
		rc_proto    = RC_PROTO_BIT_RC5 | RC_PROTO_BIT_RC6_MCE |
							RC_PROTO_BIT_RC6_6A_32;
		ir_codes    = RC_MAP_HAUPPAUGE;
		probe_tx = true;
		break;
	}

	/* Let the caller override settings */
	if (client->dev.platform_data) {
		const struct IR_i2c_init_data *init_data =
						client->dev.platform_data;

		ir_codes = init_data->ir_codes;
		rc = init_data->rc_dev;

		name = init_data->name;
		if (init_data->type)
			rc_proto = init_data->type;

		if (init_data->polling_interval)
			ir->polling_interval = init_data->polling_interval;

		switch (init_data->internal_get_key_func) {
		case IR_KBD_GET_KEY_CUSTOM:
			/* The bridge driver provided us its own function */
			ir->get_key = init_data->get_key;
			break;
		case IR_KBD_GET_KEY_PIXELVIEW:
			ir->get_key = get_key_pixelview;
			break;
		case IR_KBD_GET_KEY_HAUP:
			ir->get_key = get_key_haup;
			break;
		case IR_KBD_GET_KEY_KNC1:
			ir->get_key = get_key_knc1;
			break;
		case IR_KBD_GET_KEY_FUSIONHDTV:
			ir->get_key = get_key_fusionhdtv;
			break;
		case IR_KBD_GET_KEY_HAUP_XVR:
			ir->get_key = get_key_haup_xvr;
			break;
		case IR_KBD_GET_KEY_AVERMEDIA_CARDBUS:
			ir->get_key = get_key_avermedia_cardbus;
			break;
		}
	}

	if (!rc) {
		/*
		 * If platform_data doesn't specify rc_dev, initialize it
		 * internally
		 */
		rc = rc_allocate_device(RC_DRIVER_SCANCODE);
		if (!rc)
			return -ENOMEM;
	}
	ir->rc = rc;

	/* Make sure we are all setup before going on */
	if (!name || !ir->get_key || !rc_proto || !ir_codes) {
		dev_warn(&client->dev, "Unsupported device at address 0x%02x\n",
			 addr);
		err = -ENODEV;
		goto err_out_free;
	}

	ir->ir_codes = ir_codes;

	snprintf(ir->phys, sizeof(ir->phys), "%s/%s", dev_name(&adap->dev),
		 dev_name(&client->dev));

	/*
	 * Initialize input_dev fields
	 * It doesn't make sense to allow overriding them via platform_data
	 */
	rc->input_id.bustype = BUS_I2C;
	rc->input_phys       = ir->phys;
	rc->device_name	     = name;
	rc->dev.parent       = &client->dev;
	rc->priv             = ir;
	rc->open             = ir_open;
	rc->close            = ir_close;

	/*
	 * Initialize the other fields of rc_dev
	 */
	rc->map_name       = ir->ir_codes;
	rc->allowed_protocols = rc_proto;
	if (!rc->driver_name)
		rc->driver_name = KBUILD_MODNAME;

	mutex_init(&ir->lock);

	INIT_DELAYED_WORK(&ir->work, ir_work);

	if (probe_tx) {
		ir->tx_c = i2c_new_dummy_device(client->adapter, 0x70);
		if (IS_ERR(ir->tx_c)) {
			dev_err(&client->dev, "failed to setup tx i2c address");
			err = PTR_ERR(ir->tx_c);
			goto err_out_free;
		} else if (!zilog_init(ir)) {
			ir->carrier = 38000;
			ir->duty_cycle = 40;
			rc->tx_ir = zilog_tx;
			rc->s_tx_carrier = zilog_tx_carrier;
			rc->s_tx_duty_cycle = zilog_tx_duty_cycle;
		}
	}

	err = rc_register_device(rc);
	if (err)
		goto err_out_free;

	return 0;

 err_out_free:
	if (!IS_ERR(ir->tx_c))
		i2c_unregister_device(ir->tx_c);

	/* Only frees rc if it were allocated internally */
	rc_free_device(rc);
	return err;
}

static int ir_remove(struct i2c_client *client)
{
	struct IR_i2c *ir = i2c_get_clientdata(client);

	cancel_delayed_work_sync(&ir->work);

	i2c_unregister_device(ir->tx_c);

	rc_unregister_device(ir->rc);

	return 0;
}

static const struct i2c_device_id ir_kbd_id[] = {
	/* Generic entry for any IR receiver */
	{ "ir_video", 0 },
	/* IR device specific entries should be added here */
	{ "ir_z8f0811_haup", FLAG_TX },
	{ "ir_z8f0811_hdpvr", FLAG_TX | FLAG_HDPVR },
	{ }
};
MODULE_DEVICE_TABLE(i2c, ir_kbd_id);

static struct i2c_driver ir_kbd_driver = {
	.driver = {
		.name   = "ir-kbd-i2c",
	},
	.probe          = ir_probe,
	.remove         = ir_remove,
	.id_table       = ir_kbd_id,
};

module_i2c_driver(ir_kbd_driver);

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

MODULE_AUTHOR("Gerd Knorr, Michal Kochanowicz, Christoph Bartelmus, Ulrich Mueller");
MODULE_DESCRIPTION("input driver for i2c IR remote controls");
MODULE_LICENSE("GPL");