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/string.h> 25#include <linux/jiffies.h> 26#include <media/ir-common.h> 27#include "ir-core-priv.h" 28 29/* -------------------------------------------------------------------------- */ 30 31MODULE_AUTHOR("Gerd Knorr <kraxel@bytesex.org> [SuSE Labs]"); 32MODULE_LICENSE("GPL"); 33 34static int repeat = 1; 35module_param(repeat, int, 0444); 36MODULE_PARM_DESC(repeat,"auto-repeat for IR keys (default: on)"); 37 38/* -------------------------------------------------------------------------- */ 39 40static void ir_input_key_event(struct input_dev *dev, struct ir_input_state *ir) 41{ 42 if (KEY_RESERVED == ir->keycode) { 43 printk(KERN_INFO "%s: unknown key: key=0x%02x down=%d\n", 44 dev->name, ir->ir_key, ir->keypressed); 45 return; 46 } 47 IR_dprintk(1,"%s: key event code=%d down=%d\n", 48 dev->name,ir->keycode,ir->keypressed); 49 input_report_key(dev,ir->keycode,ir->keypressed); 50 input_sync(dev); 51} 52 53/* -------------------------------------------------------------------------- */ 54 55int ir_input_init(struct input_dev *dev, struct ir_input_state *ir, 56 const u64 ir_type) 57{ 58 ir->ir_type = ir_type; 59 60 if (repeat) 61 set_bit(EV_REP, dev->evbit); 62 63 return 0; 64} 65EXPORT_SYMBOL_GPL(ir_input_init); 66 67 68void ir_input_nokey(struct input_dev *dev, struct ir_input_state *ir) 69{ 70 if (ir->keypressed) { 71 ir->keypressed = 0; 72 ir_input_key_event(dev,ir); 73 } 74} 75EXPORT_SYMBOL_GPL(ir_input_nokey); 76 77void ir_input_keydown(struct input_dev *dev, struct ir_input_state *ir, 78 u32 ir_key) 79{ 80 u32 keycode = ir_g_keycode_from_table(dev, ir_key); 81 82 if (ir->keypressed && ir->keycode != keycode) { 83 ir->keypressed = 0; 84 ir_input_key_event(dev,ir); 85 } 86 if (!ir->keypressed) { 87 ir->ir_key = ir_key; 88 ir->keycode = keycode; 89 ir->keypressed = 1; 90 ir_input_key_event(dev,ir); 91 } 92} 93EXPORT_SYMBOL_GPL(ir_input_keydown); 94 95/* -------------------------------------------------------------------------- */ 96/* extract mask bits out of data and pack them into the result */ 97u32 ir_extract_bits(u32 data, u32 mask) 98{ 99 u32 vbit = 1, value = 0; 100 101 do { 102 if (mask&1) { 103 if (data&1) 104 value |= vbit; 105 vbit<<=1; 106 } 107 data>>=1; 108 } while (mask>>=1); 109 110 return value; 111} 112EXPORT_SYMBOL_GPL(ir_extract_bits); 113 114static int inline getbit(u32 *samples, int bit) 115{ 116 return (samples[bit/32] & (1 << (31-(bit%32)))) ? 1 : 0; 117} 118 119/* sump raw samples for visual debugging ;) */ 120int ir_dump_samples(u32 *samples, int count) 121{ 122 int i, bit, start; 123 124 printk(KERN_DEBUG "ir samples: "); 125 start = 0; 126 for (i = 0; i < count * 32; i++) { 127 bit = getbit(samples,i); 128 if (bit) 129 start = 1; 130 if (0 == start) 131 continue; 132 printk("%s", bit ? "#" : "_"); 133 } 134 printk("\n"); 135 return 0; 136} 137EXPORT_SYMBOL_GPL(ir_dump_samples); 138 139/* decode raw samples, pulse distance coding used by NEC remotes */ 140int ir_decode_pulsedistance(u32 *samples, int count, int low, int high) 141{ 142 int i,last,bit,len; 143 u32 curBit; 144 u32 value; 145 146 /* find start burst */ 147 for (i = len = 0; i < count * 32; i++) { 148 bit = getbit(samples,i); 149 if (bit) { 150 len++; 151 } else { 152 if (len >= 29) 153 break; 154 len = 0; 155 } 156 } 157 158 /* start burst to short */ 159 if (len < 29) 160 return 0xffffffff; 161 162 /* find start silence */ 163 for (len = 0; i < count * 32; i++) { 164 bit = getbit(samples,i); 165 if (bit) { 166 break; 167 } else { 168 len++; 169 } 170 } 171 172 /* silence to short */ 173 if (len < 7) 174 return 0xffffffff; 175 176 /* go decoding */ 177 len = 0; 178 last = 1; 179 value = 0; curBit = 1; 180 for (; i < count * 32; i++) { 181 bit = getbit(samples,i); 182 if (last) { 183 if(bit) { 184 continue; 185 } else { 186 len = 1; 187 } 188 } else { 189 if (bit) { 190 if (len > (low + high) /2) 191 value |= curBit; 192 curBit <<= 1; 193 if (curBit == 1) 194 break; 195 } else { 196 len++; 197 } 198 } 199 last = bit; 200 } 201 202 return value; 203} 204EXPORT_SYMBOL_GPL(ir_decode_pulsedistance); 205 206/* decode raw samples, biphase coding, used by rc5 for example */ 207int ir_decode_biphase(u32 *samples, int count, int low, int high) 208{ 209 int i,last,bit,len,flips; 210 u32 value; 211 212 /* find start bit (1) */ 213 for (i = 0; i < 32; i++) { 214 bit = getbit(samples,i); 215 if (bit) 216 break; 217 } 218 219 /* go decoding */ 220 len = 0; 221 flips = 0; 222 value = 1; 223 for (; i < count * 32; i++) { 224 if (len > high) 225 break; 226 if (flips > 1) 227 break; 228 last = bit; 229 bit = getbit(samples,i); 230 if (last == bit) { 231 len++; 232 continue; 233 } 234 if (len < low) { 235 len++; 236 flips++; 237 continue; 238 } 239 value <<= 1; 240 value |= bit; 241 flips = 0; 242 len = 1; 243 } 244 return value; 245} 246EXPORT_SYMBOL_GPL(ir_decode_biphase); 247 248/* RC5 decoding stuff, moved from bttv-input.c to share it with 249 * saa7134 */ 250 251/* decode raw bit pattern to RC5 code */ 252u32 ir_rc5_decode(unsigned int code) 253{ 254 unsigned int org_code = code; 255 unsigned int pair; 256 unsigned int rc5 = 0; 257 int i; 258 259 for (i = 0; i < 14; ++i) { 260 pair = code & 0x3; 261 code >>= 2; 262 263 rc5 <<= 1; 264 switch (pair) { 265 case 0: 266 case 2: 267 break; 268 case 1: 269 rc5 |= 1; 270 break; 271 case 3: 272 IR_dprintk(1, "ir-common: ir_rc5_decode(%x) bad code\n", org_code); 273 return 0; 274 } 275 } 276 IR_dprintk(1, "ir-common: code=%x, rc5=%x, start=%x, toggle=%x, address=%x, " 277 "instr=%x\n", rc5, org_code, RC5_START(rc5), 278 RC5_TOGGLE(rc5), RC5_ADDR(rc5), RC5_INSTR(rc5)); 279 return rc5; 280} 281EXPORT_SYMBOL_GPL(ir_rc5_decode); 282 283void ir_rc5_timer_end(unsigned long data) 284{ 285 struct card_ir *ir = (struct card_ir *)data; 286 struct timeval tv; 287 unsigned long current_jiffies, timeout; 288 u32 gap; 289 u32 rc5 = 0; 290 291 /* get time */ 292 current_jiffies = jiffies; 293 do_gettimeofday(&tv); 294 295 /* avoid overflow with gap >1s */ 296 if (tv.tv_sec - ir->base_time.tv_sec > 1) { 297 gap = 200000; 298 } else { 299 gap = 1000000 * (tv.tv_sec - ir->base_time.tv_sec) + 300 tv.tv_usec - ir->base_time.tv_usec; 301 } 302 303 /* signal we're ready to start a new code */ 304 ir->active = 0; 305 306 /* Allow some timer jitter (RC5 is ~24ms anyway so this is ok) */ 307 if (gap < 28000) { 308 IR_dprintk(1, "ir-common: spurious timer_end\n"); 309 return; 310 } 311 312 if (ir->last_bit < 20) { 313 /* ignore spurious codes (caused by light/other remotes) */ 314 IR_dprintk(1, "ir-common: short code: %x\n", ir->code); 315 } else { 316 ir->code = (ir->code << ir->shift_by) | 1; 317 rc5 = ir_rc5_decode(ir->code); 318 319 /* two start bits? */ 320 if (RC5_START(rc5) != ir->start) { 321 IR_dprintk(1, "ir-common: rc5 start bits invalid: %u\n", RC5_START(rc5)); 322 323 /* right address? */ 324 } else if (RC5_ADDR(rc5) == ir->addr) { 325 u32 toggle = RC5_TOGGLE(rc5); 326 u32 instr = RC5_INSTR(rc5); 327 328 /* Good code, decide if repeat/repress */ 329 if (toggle != RC5_TOGGLE(ir->last_rc5) || 330 instr != RC5_INSTR(ir->last_rc5)) { 331 IR_dprintk(1, "ir-common: instruction %x, toggle %x\n", instr, 332 toggle); 333 ir_input_nokey(ir->dev, &ir->ir); 334 ir_input_keydown(ir->dev, &ir->ir, instr); 335 } 336 337 /* Set/reset key-up timer */ 338 timeout = current_jiffies + 339 msecs_to_jiffies(ir->rc5_key_timeout); 340 mod_timer(&ir->timer_keyup, timeout); 341 342 /* Save code for repeat test */ 343 ir->last_rc5 = rc5; 344 } 345 } 346} 347EXPORT_SYMBOL_GPL(ir_rc5_timer_end); 348 349void ir_rc5_timer_keyup(unsigned long data) 350{ 351 struct card_ir *ir = (struct card_ir *)data; 352 353 IR_dprintk(1, "ir-common: key released\n"); 354 ir_input_nokey(ir->dev, &ir->ir); 355} 356EXPORT_SYMBOL_GPL(ir_rc5_timer_keyup); 357