aboutsummaryrefslogtreecommitdiff
path: root/drivers/media/common/ir-common.c
blob: a0e700d7a4a4ad5b5fb6c3ff7b052ff1b0449791 (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
/*
 *
 * some common structs and functions to handle infrared remotes via
 * input layer ...
 *
 * (c) 2003 Gerd Knorr <kraxel@bytesex.org> [SuSE Labs]
 *
 *  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., 59 Temple Place, Suite 330, Boston, MA  02111-1307  USA
 */

#include <linux/module.h>
#include <linux/moduleparam.h>
#include <media/ir-common.h>

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

MODULE_AUTHOR("Gerd Knorr <kraxel@bytesex.org> [SuSE Labs]");
MODULE_LICENSE("GPL");

static int repeat = 1;
module_param(repeat, int, 0444);
MODULE_PARM_DESC(repeat,"auto-repeat for IR keys (default: on)");

static int debug = 0;    /* debug level (0,1,2) */
module_param(debug, int, 0644);

#define dprintk(level, fmt, arg...)	if (debug >= level) \
	printk(KERN_DEBUG fmt , ## arg)

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

/* generic RC5 keytable                                          */
/* see http://users.pandora.be/nenya/electronics/rc5/codes00.htm */
/* used by old (black) Hauppauge remotes                         */
IR_KEYTAB_TYPE ir_codes_rc5_tv[IR_KEYTAB_SIZE] = {
	/* Keys 0 to 9 */
	[ 0x00 ] = KEY_KP0,
	[ 0x01 ] = KEY_KP1,
	[ 0x02 ] = KEY_KP2,
	[ 0x03 ] = KEY_KP3,
	[ 0x04 ] = KEY_KP4,
	[ 0x05 ] = KEY_KP5,
	[ 0x06 ] = KEY_KP6,
	[ 0x07 ] = KEY_KP7,
	[ 0x08 ] = KEY_KP8,
	[ 0x09 ] = KEY_KP9,

	[ 0x0b ] = KEY_CHANNEL,		/* channel / program (japan: 11) */
	[ 0x0c ] = KEY_POWER,		/* standby */
	[ 0x0d ] = KEY_MUTE,		/* mute / demute */
	[ 0x0f ] = KEY_TV,		/* display */
	[ 0x10 ] = KEY_VOLUMEUP,
	[ 0x11 ] = KEY_VOLUMEDOWN,
	[ 0x12 ] = KEY_BRIGHTNESSUP,
	[ 0x13 ] = KEY_BRIGHTNESSDOWN,
	[ 0x1e ] = KEY_SEARCH,		/* search + */
	[ 0x20 ] = KEY_CHANNELUP,	/* channel / program + */
	[ 0x21 ] = KEY_CHANNELDOWN,	/* channel / program - */
	[ 0x22 ] = KEY_CHANNEL,		/* alt / channel */
	[ 0x23 ] = KEY_LANGUAGE,	/* 1st / 2nd language */
	[ 0x26 ] = KEY_SLEEP,		/* sleeptimer */
	[ 0x2e ] = KEY_MENU,		/* 2nd controls (USA: menu) */
	[ 0x30 ] = KEY_PAUSE,
	[ 0x32 ] = KEY_REWIND,
	[ 0x33 ] = KEY_GOTO,
	[ 0x35 ] = KEY_PLAY,
	[ 0x36 ] = KEY_STOP,
	[ 0x37 ] = KEY_RECORD,		/* recording */
	[ 0x3c ] = KEY_TEXT,    	/* teletext submode (Japan: 12) */
	[ 0x3d ] = KEY_SUSPEND,		/* system standby */

};
EXPORT_SYMBOL_GPL(ir_codes_rc5_tv);

/* Table for Leadtek Winfast Remote Controls - used by both bttv and cx88 */
IR_KEYTAB_TYPE ir_codes_winfast[IR_KEYTAB_SIZE] = {
	/* Keys 0 to 9 */
	[ 18 ] = KEY_KP0,
	[  5 ] = KEY_KP1,
	[  6 ] = KEY_KP2,
	[  7 ] = KEY_KP3,
	[  9 ] = KEY_KP4,
	[ 10 ] = KEY_KP5,
	[ 11 ] = KEY_KP6,
	[ 13 ] = KEY_KP7,
	[ 14 ] = KEY_KP8,
	[ 15 ] = KEY_KP9,

	[  0 ] = KEY_POWER,
	[  2 ] = KEY_TUNER,		/* TV/FM */
	[ 30 ] = KEY_VIDEO,
	[  4 ] = KEY_VOLUMEUP,
	[  8 ] = KEY_VOLUMEDOWN,
	[ 12 ] = KEY_CHANNELUP,
	[ 16 ] = KEY_CHANNELDOWN,
	[  3 ] = KEY_ZOOM,		/* fullscreen */
	[ 31 ] = KEY_SUBTITLE,		/* closed caption/teletext */
	[ 32 ] = KEY_SLEEP,
	[ 20 ] = KEY_MUTE,
	[ 43 ] = KEY_RED,
	[ 44 ] = KEY_GREEN,
	[ 45 ] = KEY_YELLOW,
	[ 46 ] = KEY_BLUE,
	[ 24 ] = KEY_KPPLUS,		/* fine tune + */
	[ 25 ] = KEY_KPMINUS,		/* fine tune - */
        [ 33 ] = KEY_KPDOT,
	[ 19 ] = KEY_KPENTER,
	[ 34 ] = KEY_BACK,
	[ 35 ] = KEY_PLAYPAUSE,
	[ 36 ] = KEY_NEXT,
	[ 38 ] = KEY_STOP,
	[ 39 ] = KEY_RECORD
};
EXPORT_SYMBOL_GPL(ir_codes_winfast);

/* empty keytable, can be used as placeholder for not-yet created keytables */
IR_KEYTAB_TYPE ir_codes_empty[IR_KEYTAB_SIZE] = {
	[ 42 ] = KEY_COFFEE,
};
EXPORT_SYMBOL_GPL(ir_codes_empty);

/* Hauppauge: the newer, gray remotes (seems there are multiple
 * slightly different versions), shipped with cx88+ivtv cards.
 * almost rc5 coding, but some non-standard keys */
IR_KEYTAB_TYPE ir_codes_hauppauge_new[IR_KEYTAB_SIZE] = {
	/* Keys 0 to 9 */
	[ 0x00 ] = KEY_KP0,
	[ 0x01 ] = KEY_KP1,
	[ 0x02 ] = KEY_KP2,
	[ 0x03 ] = KEY_KP3,
	[ 0x04 ] = KEY_KP4,
	[ 0x05 ] = KEY_KP5,
	[ 0x06 ] = KEY_KP6,
	[ 0x07 ] = KEY_KP7,
	[ 0x08 ] = KEY_KP8,
	[ 0x09 ] = KEY_KP9,

	[ 0x0a ] = KEY_TEXT,      	/* keypad asterisk as well */
	[ 0x0b ] = KEY_RED,		/* red button */
	[ 0x0c ] = KEY_RADIO,
	[ 0x0d ] = KEY_MENU,
	[ 0x0e ] = KEY_SUBTITLE,	/* also the # key */
	[ 0x0f ] = KEY_MUTE,
	[ 0x10 ] = KEY_VOLUMEUP,
	[ 0x11 ] = KEY_VOLUMEDOWN,
	[ 0x12 ] = KEY_PREVIOUS,	/* previous channel */
	[ 0x14 ] = KEY_UP,
	[ 0x15 ] = KEY_DOWN,
	[ 0x16 ] = KEY_LEFT,
	[ 0x17 ] = KEY_RIGHT,
	[ 0x18 ] = KEY_VIDEO,		/* Videos */
	[ 0x19 ] = KEY_AUDIO,		/* Music */
	/* 0x1a: Pictures - presume this means
	   "Multimedia Home Platform" -
	   no "PICTURES" key in input.h
	 */
	[ 0x1a ] = KEY_MHP,

	[ 0x1b ] = KEY_EPG,		/* Guide */
	[ 0x1c ] = KEY_TV,
	[ 0x1e ] = KEY_NEXTSONG,	/* skip >| */
	[ 0x1f ] = KEY_EXIT,		/* back/exit */
	[ 0x20 ] = KEY_CHANNELUP,	/* channel / program + */
	[ 0x21 ] = KEY_CHANNELDOWN,	/* channel / program - */
	[ 0x22 ] = KEY_CHANNEL,		/* source (old black remote) */
	[ 0x24 ] = KEY_PREVIOUSSONG,	/* replay |< */
	[ 0x25 ] = KEY_ENTER,		/* OK */
	[ 0x26 ] = KEY_SLEEP,		/* minimize (old black remote) */
	[ 0x29 ] = KEY_BLUE,		/* blue key */
	[ 0x2e ] = KEY_GREEN,		/* green button */
	[ 0x30 ] = KEY_PAUSE,		/* pause */
	[ 0x32 ] = KEY_REWIND,		/* backward << */
	[ 0x34 ] = KEY_FASTFORWARD,	/* forward >> */
	[ 0x35 ] = KEY_PLAY,
	[ 0x36 ] = KEY_STOP,
	[ 0x37 ] = KEY_RECORD,		/* recording */
	[ 0x38 ] = KEY_YELLOW,		/* yellow key */
	[ 0x3b ] = KEY_SELECT,		/* top right button */
	[ 0x3c ] = KEY_ZOOM,		/* full */
	[ 0x3d ] = KEY_POWER,		/* system power (green button) */
};
EXPORT_SYMBOL(ir_codes_hauppauge_new);

IR_KEYTAB_TYPE ir_codes_pixelview[IR_KEYTAB_SIZE] = {
	[  2 ] = KEY_KP0,
	[  1 ] = KEY_KP1,
	[ 11 ] = KEY_KP2,
	[ 27 ] = KEY_KP3,
	[  5 ] = KEY_KP4,
	[  9 ] = KEY_KP5,
	[ 21 ] = KEY_KP6,
	[  6 ] = KEY_KP7,
	[ 10 ] = KEY_KP8,
	[ 18 ] = KEY_KP9,

	[  3 ] = KEY_TUNER,		/* TV/FM */
	[  7 ] = KEY_SEARCH,		/* scan */
	[ 28 ] = KEY_ZOOM,		/* full screen */
	[ 30 ] = KEY_POWER,
	[ 23 ] = KEY_VOLUMEDOWN,
	[ 31 ] = KEY_VOLUMEUP,
	[ 20 ] = KEY_CHANNELDOWN,
	[ 22 ] = KEY_CHANNELUP,
	[ 24 ] = KEY_MUTE,

	[  0 ] = KEY_LIST,		/* source */
	[ 19 ] = KEY_INFO,		/* loop */
	[ 16 ] = KEY_LAST,		/* +100 */
	[ 13 ] = KEY_CLEAR,		/* reset */
	[ 12 ] = BTN_RIGHT,		/* fun++ */
	[  4 ] = BTN_LEFT,		/* fun-- */
	[ 14 ] = KEY_GOTO,		/* function */
	[ 15 ] = KEY_STOP,		/* freeze */
};
EXPORT_SYMBOL(ir_codes_pixelview);

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

static void ir_input_key_event(struct input_dev *dev, struct ir_input_state *ir)
{
	if (KEY_RESERVED == ir->keycode) {
		printk(KERN_INFO "%s: unknown key: key=0x%02x raw=0x%02x down=%d\n",
		       dev->name,ir->ir_key,ir->ir_raw,ir->keypressed);
		return;
	}
	dprintk(1,"%s: key event code=%d down=%d\n",
		dev->name,ir->keycode,ir->keypressed);
	input_report_key(dev,ir->keycode,ir->keypressed);
        input_sync(dev);
}

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

void ir_input_init(struct input_dev *dev, struct ir_input_state *ir,
		   int ir_type, IR_KEYTAB_TYPE *ir_codes)
{
	int i;

	ir->ir_type = ir_type;
	if (ir_codes)
		memcpy(ir->ir_codes, ir_codes, sizeof(ir->ir_codes));

        init_input_dev(dev);
	dev->keycode     = ir->ir_codes;
	dev->keycodesize = sizeof(IR_KEYTAB_TYPE);
	dev->keycodemax  = IR_KEYTAB_SIZE;
	for (i = 0; i < IR_KEYTAB_SIZE; i++)
		set_bit(ir->ir_codes[i], dev->keybit);
	clear_bit(0, dev->keybit);

	set_bit(EV_KEY, dev->evbit);
	if (repeat)
		set_bit(EV_REP, dev->evbit);
}

void ir_input_nokey(struct input_dev *dev, struct ir_input_state *ir)
{
	if (ir->keypressed) {
		ir->keypressed = 0;
		ir_input_key_event(dev,ir);
	}
}

void ir_input_keydown(struct input_dev *dev, struct ir_input_state *ir,
		      u32 ir_key, u32 ir_raw)
{
	u32 keycode = IR_KEYCODE(ir->ir_codes, ir_key);

	if (ir->keypressed && ir->keycode != keycode) {
		ir->keypressed = 0;
		ir_input_key_event(dev,ir);
	}
	if (!ir->keypressed) {
		ir->ir_key  = ir_key;
		ir->ir_raw  = ir_raw;
		ir->keycode = keycode;
		ir->keypressed = 1;
		ir_input_key_event(dev,ir);
	}
}

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

u32 ir_extract_bits(u32 data, u32 mask)
{
	int mbit, vbit;
	u32 value;

	value = 0;
	vbit  = 0;
	for (mbit = 0; mbit < 32; mbit++) {
		if (!(mask & ((u32)1 << mbit)))
			continue;
		if (data & ((u32)1 << mbit))
			value |= (1 << vbit);
		vbit++;
	}
	return value;
}

static int inline getbit(u32 *samples, int bit)
{
	return (samples[bit/32] & (1 << (31-(bit%32)))) ? 1 : 0;
}

/* sump raw samples for visual debugging ;) */
int ir_dump_samples(u32 *samples, int count)
{
	int i, bit, start;

	printk(KERN_DEBUG "ir samples: ");
	start = 0;
	for (i = 0; i < count * 32; i++) {
		bit = getbit(samples,i);
		if (bit)
			start = 1;
		if (0 == start)
			continue;
		printk("%s", bit ? "#" : "_");
	}
	printk("\n");
	return 0;
}

/* decode raw samples, pulse distance coding used by NEC remotes */
int ir_decode_pulsedistance(u32 *samples, int count, int low, int high)
{
	int i,last,bit,len;
	u32 curBit;
	u32 value;

	/* find start burst */
	for (i = len = 0; i < count * 32; i++) {
		bit = getbit(samples,i);
		if (bit) {
			len++;
		} else {
			if (len >= 29)
				break;
			len = 0;
		}
	}

	/* start burst to short */
	if (len < 29)
		return 0xffffffff;

	/* find start silence */
	for (len = 0; i < count * 32; i++) {
		bit = getbit(samples,i);
		if (bit) {
			break;
		} else {
			len++;
		}
	}

	/* silence to short */
	if (len < 7)
		return 0xffffffff;

	/* go decoding */
	len   = 0;
	last = 1;
	value = 0; curBit = 1;
	for (; i < count * 32; i++) {
		bit  = getbit(samples,i);
		if (last) {
			if(bit) {
				continue;
			} else {
				len = 1;
			}
		} else {
			if (bit) {
				if (len > (low + high) /2)
					value |= curBit;
				curBit <<= 1;
				if (curBit == 1)
					break;
			} else {
				len++;
			}
		}
		last = bit;
	}

	return value;
}

/* decode raw samples, biphase coding, used by rc5 for example */
int ir_decode_biphase(u32 *samples, int count, int low, int high)
{
	int i,last,bit,len,flips;
	u32 value;

	/* find start bit (1) */
	for (i = 0; i < 32; i++) {
		bit = getbit(samples,i);
		if (bit)
			break;
	}

	/* go decoding */
	len   = 0;
	flips = 0;
	value = 1;
	for (; i < count * 32; i++) {
		if (len > high)
			break;
		if (flips > 1)
			break;
		last = bit;
		bit  = getbit(samples,i);
		if (last == bit) {
			len++;
			continue;
		}
		if (len < low) {
			len++;
			flips++;
			continue;
		}
		value <<= 1;
		value |= bit;
		flips = 0;
		len   = 1;
	}
	return value;
}

EXPORT_SYMBOL_GPL(ir_input_init);
EXPORT_SYMBOL_GPL(ir_input_nokey);
EXPORT_SYMBOL_GPL(ir_input_keydown);

EXPORT_SYMBOL_GPL(ir_extract_bits);
EXPORT_SYMBOL_GPL(ir_dump_samples);
EXPORT_SYMBOL_GPL(ir_decode_biphase);
EXPORT_SYMBOL_GPL(ir_decode_pulsedistance);

/*
 * Local variables:
 * c-basic-offset: 8
 * End:
 */