drivers/media/common/ir-common.c

   1 /*
   2  *
   3  * some common structs and functions to handle infrared remotes via
   4  * input layer ...
   5  *
   6  * (c) 2003 Gerd Knorr <kraxel@bytesex.org> [SuSE Labs]
   7  *
   8  *  This program is free software; you can redistribute it and/or modify
   9  *  it under the terms of the GNU General Public License as published by
  10  *  the Free Software Foundation; either version 2 of the License, or
  11  *  (at your option) any later version.
  12  *
  13  *  This program is distributed in the hope that it will be useful,
  14  *  but WITHOUT ANY WARRANTY; without even the implied warranty of
  15  *  MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  16  *  GNU General Public License for more details.
  17  *
  18  *  You should have received a copy of the GNU General Public License
  19  *  along with this program; if not, write to the Free Software
  20  *  Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA  02111-1307  USA
  21  */
  22
  23 #include <linux/module.h>
  24 #include <linux/moduleparam.h>
  25 #include <linux/string.h>
  26 #include <media/ir-common.h>
  27
  28 /* -------------------------------------------------------------------------- */
  29
  30 MODULE_AUTHOR("Gerd Knorr <kraxel@bytesex.org> [SuSE Labs]");
  31 MODULE_LICENSE("GPL");
  32
  33 static int repeat = 1;
  34 module_param(repeat, int, 0444);
  35 MODULE_PARM_DESC(repeat,"auto-repeat for IR keys (default: on)");
  36
  37 static int debug = 0;    /* debug level (0,1,2) */
  38 module_param(debug, int, 0644);
  39
  40 #define dprintk(level, fmt, arg...)     if (debug >= level) \
  41         printk(KERN_DEBUG fmt , ## arg)
  42
  43 /* -------------------------------------------------------------------------- */
  44
  45 /* generic RC5 keytable                                          */
  46 /* see http://users.pandora.be/nenya/electronics/rc5/codes00.htm */
  47 /* used by old (black) Hauppauge remotes                         */
  48 IR_KEYTAB_TYPE ir_codes_rc5_tv[IR_KEYTAB_SIZE] = {
  49         /* Keys 0 to 9 */
  50         [ 0x00 ] = KEY_KP0,
  51         [ 0x01 ] = KEY_KP1,
  52         [ 0x02 ] = KEY_KP2,
  53         [ 0x03 ] = KEY_KP3,
  54         [ 0x04 ] = KEY_KP4,
  55         [ 0x05 ] = KEY_KP5,
  56         [ 0x06 ] = KEY_KP6,
  57         [ 0x07 ] = KEY_KP7,
  58         [ 0x08 ] = KEY_KP8,
  59         [ 0x09 ] = KEY_KP9,
  60
  61         [ 0x0b ] = KEY_CHANNEL,         /* channel / program (japan: 11) */
  62         [ 0x0c ] = KEY_POWER,           /* standby */
  63         [ 0x0d ] = KEY_MUTE,            /* mute / demute */
  64         [ 0x0f ] = KEY_TV,              /* display */
  65         [ 0x10 ] = KEY_VOLUMEUP,
  66         [ 0x11 ] = KEY_VOLUMEDOWN,
  67         [ 0x12 ] = KEY_BRIGHTNESSUP,
  68         [ 0x13 ] = KEY_BRIGHTNESSDOWN,
  69         [ 0x1e ] = KEY_SEARCH,          /* search + */
  70         [ 0x20 ] = KEY_CHANNELUP,       /* channel / program + */
  71         [ 0x21 ] = KEY_CHANNELDOWN,     /* channel / program - */
  72         [ 0x22 ] = KEY_CHANNEL,         /* alt / channel */
  73         [ 0x23 ] = KEY_LANGUAGE,        /* 1st / 2nd language */
  74         [ 0x26 ] = KEY_SLEEP,           /* sleeptimer */
  75         [ 0x2e ] = KEY_MENU,            /* 2nd controls (USA: menu) */
  76         [ 0x30 ] = KEY_PAUSE,
  77         [ 0x32 ] = KEY_REWIND,
  78         [ 0x33 ] = KEY_GOTO,
  79         [ 0x35 ] = KEY_PLAY,
  80         [ 0x36 ] = KEY_STOP,
  81         [ 0x37 ] = KEY_RECORD,          /* recording */
  82         [ 0x3c ] = KEY_TEXT,            /* teletext submode (Japan: 12) */
  83         [ 0x3d ] = KEY_SUSPEND,         /* system standby */
  84
  85 };
  86 EXPORT_SYMBOL_GPL(ir_codes_rc5_tv);
  87
  88 /* Table for Leadtek Winfast Remote Controls - used by both bttv and cx88 */
  89 IR_KEYTAB_TYPE ir_codes_winfast[IR_KEYTAB_SIZE] = {
  90         /* Keys 0 to 9 */
  91         [ 18 ] = KEY_KP0,
  92         [  5 ] = KEY_KP1,
  93         [  6 ] = KEY_KP2,
  94         [  7 ] = KEY_KP3,
  95         [  9 ] = KEY_KP4,
  96         [ 10 ] = KEY_KP5,
  97         [ 11 ] = KEY_KP6,
  98         [ 13 ] = KEY_KP7,
  99         [ 14 ] = KEY_KP8,
 100         [ 15 ] = KEY_KP9,
 101
 102         [  0 ] = KEY_POWER,
 103         [  2 ] = KEY_TUNER,             /* TV/FM */
 104         [ 30 ] = KEY_VIDEO,
 105         [  4 ] = KEY_VOLUMEUP,
 106         [  8 ] = KEY_VOLUMEDOWN,
 107         [ 12 ] = KEY_CHANNELUP,
 108         [ 16 ] = KEY_CHANNELDOWN,
 109         [  3 ] = KEY_ZOOM,              /* fullscreen */
 110         [ 31 ] = KEY_SUBTITLE,          /* closed caption/teletext */
 111         [ 32 ] = KEY_SLEEP,
 112         [ 20 ] = KEY_MUTE,
 113         [ 43 ] = KEY_RED,
 114         [ 44 ] = KEY_GREEN,
 115         [ 45 ] = KEY_YELLOW,
 116         [ 46 ] = KEY_BLUE,
 117         [ 24 ] = KEY_KPPLUS,            /* fine tune + */
 118         [ 25 ] = KEY_KPMINUS,           /* fine tune - */
 119         [ 33 ] = KEY_KPDOT,
 120         [ 19 ] = KEY_KPENTER,
 121         [ 34 ] = KEY_BACK,
 122         [ 35 ] = KEY_PLAYPAUSE,
 123         [ 36 ] = KEY_NEXT,
 124         [ 38 ] = KEY_STOP,
 125         [ 39 ] = KEY_RECORD
 126 };
 127 EXPORT_SYMBOL_GPL(ir_codes_winfast);
 128
 129 IR_KEYTAB_TYPE ir_codes_pinnacle[IR_KEYTAB_SIZE] = {
 130         [ 0x59 ] = KEY_MUTE,
 131         [ 0x4a ] = KEY_POWER,
 132
 133         [ 0x18 ] = KEY_TEXT,
 134         [ 0x26 ] = KEY_TV,
 135         [ 0x3d ] = KEY_PRINT,
 136
 137         [ 0x48 ] = KEY_RED,
 138         [ 0x04 ] = KEY_GREEN,
 139         [ 0x11 ] = KEY_YELLOW,
 140         [ 0x00 ] = KEY_BLUE,
 141
 142         [ 0x2d ] = KEY_VOLUMEUP,
 143         [ 0x1e ] = KEY_VOLUMEDOWN,
 144
 145         [ 0x49 ] = KEY_MENU,
 146
 147         [ 0x16 ] = KEY_CHANNELUP,
 148         [ 0x17 ] = KEY_CHANNELDOWN,
 149
 150         [ 0x20 ] = KEY_UP,
 151         [ 0x21 ] = KEY_DOWN,
 152         [ 0x22 ] = KEY_LEFT,
 153         [ 0x23 ] = KEY_RIGHT,
 154         [ 0x0d ] = KEY_SELECT,
 155
 156
 157
 158         [ 0x08 ] = KEY_BACK,
 159         [ 0x07 ] = KEY_REFRESH,
 160
 161         [ 0x2f ] = KEY_ZOOM,
 162         [ 0x29 ] = KEY_RECORD,
 163
 164         [ 0x4b ] = KEY_PAUSE,
 165         [ 0x4d ] = KEY_REWIND,
 166         [ 0x2e ] = KEY_PLAY,
 167         [ 0x4e ] = KEY_FORWARD,
 168         [ 0x53 ] = KEY_PREVIOUS,
 169         [ 0x4c ] = KEY_STOP,
 170         [ 0x54 ] = KEY_NEXT,
 171
 172         [ 0x69 ] = KEY_KP0,
 173         [ 0x6a ] = KEY_KP1,
 174         [ 0x6b ] = KEY_KP2,
 175         [ 0x6c ] = KEY_KP3,
 176         [ 0x6d ] = KEY_KP4,
 177         [ 0x6e ] = KEY_KP5,
 178         [ 0x6f ] = KEY_KP6,
 179         [ 0x70 ] = KEY_KP7,
 180         [ 0x71 ] = KEY_KP8,
 181         [ 0x72 ] = KEY_KP9,
 182
 183         [ 0x74 ] = KEY_CHANNEL,
 184         [ 0x0a ] = KEY_BACKSPACE,
 185 };
 186
 187 EXPORT_SYMBOL_GPL(ir_codes_pinnacle);
 188
 189 /* empty keytable, can be used as placeholder for not-yet created keytables */
 190 IR_KEYTAB_TYPE ir_codes_empty[IR_KEYTAB_SIZE] = {
 191         [ 42 ] = KEY_COFFEE,
 192 };
 193 EXPORT_SYMBOL_GPL(ir_codes_empty);
 194
 195 /* Hauppauge: the newer, gray remotes (seems there are multiple
 196  * slightly different versions), shipped with cx88+ivtv cards.
 197  * almost rc5 coding, but some non-standard keys */
 198 IR_KEYTAB_TYPE ir_codes_hauppauge_new[IR_KEYTAB_SIZE] = {
 199         /* Keys 0 to 9 */
 200         [ 0x00 ] = KEY_KP0,
 201         [ 0x01 ] = KEY_KP1,
 202         [ 0x02 ] = KEY_KP2,
 203         [ 0x03 ] = KEY_KP3,
 204         [ 0x04 ] = KEY_KP4,
 205         [ 0x05 ] = KEY_KP5,
 206         [ 0x06 ] = KEY_KP6,
 207         [ 0x07 ] = KEY_KP7,
 208         [ 0x08 ] = KEY_KP8,
 209         [ 0x09 ] = KEY_KP9,
 210
 211         [ 0x0a ] = KEY_TEXT,            /* keypad asterisk as well */
 212         [ 0x0b ] = KEY_RED,             /* red button */
 213         [ 0x0c ] = KEY_RADIO,
 214         [ 0x0d ] = KEY_MENU,
 215         [ 0x0e ] = KEY_SUBTITLE,        /* also the # key */
 216         [ 0x0f ] = KEY_MUTE,
 217         [ 0x10 ] = KEY_VOLUMEUP,
 218         [ 0x11 ] = KEY_VOLUMEDOWN,
 219         [ 0x12 ] = KEY_PREVIOUS,        /* previous channel */
 220         [ 0x14 ] = KEY_UP,
 221         [ 0x15 ] = KEY_DOWN,
 222         [ 0x16 ] = KEY_LEFT,
 223         [ 0x17 ] = KEY_RIGHT,
 224         [ 0x18 ] = KEY_VIDEO,           /* Videos */
 225         [ 0x19 ] = KEY_AUDIO,           /* Music */
 226         /* 0x1a: Pictures - presume this means
 227            "Multimedia Home Platform" -
 228            no "PICTURES" key in input.h
 229          */
 230         [ 0x1a ] = KEY_MHP,
 231
 232         [ 0x1b ] = KEY_EPG,             /* Guide */
 233         [ 0x1c ] = KEY_TV,
 234         [ 0x1e ] = KEY_NEXTSONG,        /* skip >| */
 235         [ 0x1f ] = KEY_EXIT,            /* back/exit */
 236         [ 0x20 ] = KEY_CHANNELUP,       /* channel / program + */
 237         [ 0x21 ] = KEY_CHANNELDOWN,     /* channel / program - */
 238         [ 0x22 ] = KEY_CHANNEL,         /* source (old black remote) */
 239         [ 0x24 ] = KEY_PREVIOUSSONG,    /* replay |< */
 240         [ 0x25 ] = KEY_ENTER,           /* OK */
 241         [ 0x26 ] = KEY_SLEEP,           /* minimize (old black remote) */
 242         [ 0x29 ] = KEY_BLUE,            /* blue key */
 243         [ 0x2e ] = KEY_GREEN,           /* green button */
 244         [ 0x30 ] = KEY_PAUSE,           /* pause */
 245         [ 0x32 ] = KEY_REWIND,          /* backward << */
 246         [ 0x34 ] = KEY_FASTFORWARD,     /* forward >> */
 247         [ 0x35 ] = KEY_PLAY,
 248         [ 0x36 ] = KEY_STOP,
 249         [ 0x37 ] = KEY_RECORD,          /* recording */
 250         [ 0x38 ] = KEY_YELLOW,          /* yellow key */
 251         [ 0x3b ] = KEY_SELECT,          /* top right button */
 252         [ 0x3c ] = KEY_ZOOM,            /* full */
 253         [ 0x3d ] = KEY_POWER,           /* system power (green button) */
 254 };
 255 EXPORT_SYMBOL(ir_codes_hauppauge_new);
 256
 257 IR_KEYTAB_TYPE ir_codes_pixelview[IR_KEYTAB_SIZE] = {
 258         [  2 ] = KEY_KP0,
 259         [  1 ] = KEY_KP1,
 260         [ 11 ] = KEY_KP2,
 261         [ 27 ] = KEY_KP3,
 262         [  5 ] = KEY_KP4,
 263         [  9 ] = KEY_KP5,
 264         [ 21 ] = KEY_KP6,
 265         [  6 ] = KEY_KP7,
 266         [ 10 ] = KEY_KP8,
 267         [ 18 ] = KEY_KP9,
 268
 269         [  3 ] = KEY_TUNER,             /* TV/FM */
 270         [  7 ] = KEY_SEARCH,            /* scan */
 271         [ 28 ] = KEY_ZOOM,              /* full screen */
 272         [ 30 ] = KEY_POWER,
 273         [ 23 ] = KEY_VOLUMEDOWN,
 274         [ 31 ] = KEY_VOLUMEUP,
 275         [ 20 ] = KEY_CHANNELDOWN,
 276         [ 22 ] = KEY_CHANNELUP,
 277         [ 24 ] = KEY_MUTE,
 278
 279         [  0 ] = KEY_LIST,              /* source */
 280         [ 19 ] = KEY_INFO,              /* loop */
 281         [ 16 ] = KEY_LAST,              /* +100 */
 282         [ 13 ] = KEY_CLEAR,             /* reset */
 283         [ 12 ] = BTN_RIGHT,             /* fun++ */
 284         [  4 ] = BTN_LEFT,              /* fun-- */
 285         [ 14 ] = KEY_GOTO,              /* function */
 286         [ 15 ] = KEY_STOP,              /* freeze */
 287 };
 288 EXPORT_SYMBOL(ir_codes_pixelview);
 289
 290 /* -------------------------------------------------------------------------- */
 291
 292 static void ir_input_key_event(struct input_dev *dev, struct ir_input_state *ir)
 293 {
 294         if (KEY_RESERVED == ir->keycode) {
 295                 printk(KERN_INFO "%s: unknown key: key=0x%02x raw=0x%02x down=%d\n",
 296                        dev->name,ir->ir_key,ir->ir_raw,ir->keypressed);
 297                 return;
 298         }
 299         dprintk(1,"%s: key event code=%d down=%d\n",
 300                 dev->name,ir->keycode,ir->keypressed);
 301         input_report_key(dev,ir->keycode,ir->keypressed);
 302         input_sync(dev);
 303 }
 304
 305 /* -------------------------------------------------------------------------- */
 306
 307 void ir_input_init(struct input_dev *dev, struct ir_input_state *ir,
 308                    int ir_type, IR_KEYTAB_TYPE *ir_codes)
 309 {
 310         int i;
 311
 312         ir->ir_type = ir_type;
 313         if (ir_codes)
 314                 memcpy(ir->ir_codes, ir_codes, sizeof(ir->ir_codes));
 315
 316
 317         dev->keycode     = ir->ir_codes;
 318         dev->keycodesize = sizeof(IR_KEYTAB_TYPE);
 319         dev->keycodemax  = IR_KEYTAB_SIZE;
 320         for (i = 0; i < IR_KEYTAB_SIZE; i++)
 321                 set_bit(ir->ir_codes[i], dev->keybit);
 322         clear_bit(0, dev->keybit);
 323
 324         set_bit(EV_KEY, dev->evbit);
 325         if (repeat)
 326                 set_bit(EV_REP, dev->evbit);
 327 }
 328
 329 void ir_input_nokey(struct input_dev *dev, struct ir_input_state *ir)
 330 {
 331         if (ir->keypressed) {
 332                 ir->keypressed = 0;
 333                 ir_input_key_event(dev,ir);
 334         }
 335 }
 336
 337 void ir_input_keydown(struct input_dev *dev, struct ir_input_state *ir,
 338                       u32 ir_key, u32 ir_raw)
 339 {
 340         u32 keycode = IR_KEYCODE(ir->ir_codes, ir_key);
 341
 342         if (ir->keypressed && ir->keycode != keycode) {
 343                 ir->keypressed = 0;
 344                 ir_input_key_event(dev,ir);
 345         }
 346         if (!ir->keypressed) {
 347                 ir->ir_key  = ir_key;
 348                 ir->ir_raw  = ir_raw;
 349                 ir->keycode = keycode;
 350                 ir->keypressed = 1;
 351                 ir_input_key_event(dev,ir);
 352         }
 353 }
 354
 355 /* -------------------------------------------------------------------------- */
 356
 357 u32 ir_extract_bits(u32 data, u32 mask)
 358 {
 359         int mbit, vbit;
 360         u32 value;
 361
 362         value = 0;
 363         vbit  = 0;
 364         for (mbit = 0; mbit < 32; mbit++) {
 365                 if (!(mask & ((u32)1 << mbit)))
 366                         continue;
 367                 if (data & ((u32)1 << mbit))
 368                         value |= (1 << vbit);
 369                 vbit++;
 370         }
 371         return value;
 372 }
 373
 374 static int inline getbit(u32 *samples, int bit)
 375 {
 376         return (samples[bit/32] & (1 << (31-(bit%32)))) ? 1 : 0;
 377 }
 378
 379 /* sump raw samples for visual debugging ;) */
 380 int ir_dump_samples(u32 *samples, int count)
 381 {
 382         int i, bit, start;
 383
 384         printk(KERN_DEBUG "ir samples: ");
 385         start = 0;
 386         for (i = 0; i < count * 32; i++) {
 387                 bit = getbit(samples,i);
 388                 if (bit)
 389                         start = 1;
 390                 if (0 == start)
 391                         continue;
 392                 printk("%s", bit ? "#" : "_");
 393         }
 394         printk("\n");
 395         return 0;
 396 }
 397
 398 /* decode raw samples, pulse distance coding used by NEC remotes */
 399 int ir_decode_pulsedistance(u32 *samples, int count, int low, int high)
 400 {
 401         int i,last,bit,len;
 402         u32 curBit;
 403         u32 value;
 404
 405         /* find start burst */
 406         for (i = len = 0; i < count * 32; i++) {
 407                 bit = getbit(samples,i);
 408                 if (bit) {
 409                         len++;
 410                 } else {
 411                         if (len >= 29)
 412                                 break;
 413                         len = 0;
 414                 }
 415         }
 416
 417         /* start burst to short */
 418         if (len < 29)
 419                 return 0xffffffff;
 420
 421         /* find start silence */
 422         for (len = 0; i < count * 32; i++) {
 423                 bit = getbit(samples,i);
 424                 if (bit) {
 425                         break;
 426                 } else {
 427                         len++;
 428                 }
 429         }
 430
 431         /* silence to short */
 432         if (len < 7)
 433                 return 0xffffffff;
 434
 435         /* go decoding */
 436         len   = 0;
 437         last = 1;
 438         value = 0; curBit = 1;
 439         for (; i < count * 32; i++) {
 440                 bit  = getbit(samples,i);
 441                 if (last) {
 442                         if(bit) {
 443                                 continue;
 444                         } else {
 445                                 len = 1;
 446                         }
 447                 } else {
 448                         if (bit) {
 449                                 if (len > (low + high) /2)
 450                                         value |= curBit;
 451                                 curBit <<= 1;
 452                                 if (curBit == 1)
 453                                         break;
 454                         } else {
 455                                 len++;
 456                         }
 457                 }
 458                 last = bit;
 459         }
 460
 461         return value;
 462 }
 463
 464 /* decode raw samples, biphase coding, used by rc5 for example */
 465 int ir_decode_biphase(u32 *samples, int count, int low, int high)
 466 {
 467         int i,last,bit,len,flips;
 468         u32 value;
 469
 470         /* find start bit (1) */
 471         for (i = 0; i < 32; i++) {
 472                 bit = getbit(samples,i);
 473                 if (bit)
 474                         break;
 475         }
 476
 477         /* go decoding */
 478         len   = 0;
 479         flips = 0;
 480         value = 1;
 481         for (; i < count * 32; i++) {
 482                 if (len > high)
 483                         break;
 484                 if (flips > 1)
 485                         break;
 486                 last = bit;
 487                 bit  = getbit(samples,i);
 488                 if (last == bit) {
 489                         len++;
 490                         continue;
 491                 }
 492                 if (len < low) {
 493                         len++;
 494                         flips++;
 495                         continue;
 496                 }
 497                 value <<= 1;
 498                 value |= bit;
 499                 flips = 0;
 500                 len   = 1;
 501         }
 502         return value;
 503 }
 504
 505 EXPORT_SYMBOL_GPL(ir_input_init);
 506 EXPORT_SYMBOL_GPL(ir_input_nokey);
 507 EXPORT_SYMBOL_GPL(ir_input_keydown);
 508
 509 EXPORT_SYMBOL_GPL(ir_extract_bits);
 510 EXPORT_SYMBOL_GPL(ir_dump_samples);
 511 EXPORT_SYMBOL_GPL(ir_decode_biphase);
 512 EXPORT_SYMBOL_GPL(ir_decode_pulsedistance);
 513
 514 /*
 515  * Local variables:
 516  * c-basic-offset: 8
 517  * End:
 518  */
 519