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