Ricardo Cerqueira | d15549a | 2006-03-03 12:13:42 -0300 | [diff] [blame] | 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 | static void ir_input_key_event(struct input_dev *dev, struct ir_input_state *ir) |
| 46 | { |
| 47 | if (KEY_RESERVED == ir->keycode) { |
| 48 | printk(KERN_INFO "%s: unknown key: key=0x%02x raw=0x%02x down=%d\n", |
| 49 | dev->name,ir->ir_key,ir->ir_raw,ir->keypressed); |
| 50 | return; |
| 51 | } |
| 52 | dprintk(1,"%s: key event code=%d down=%d\n", |
| 53 | dev->name,ir->keycode,ir->keypressed); |
| 54 | input_report_key(dev,ir->keycode,ir->keypressed); |
| 55 | input_sync(dev); |
| 56 | } |
| 57 | |
| 58 | /* -------------------------------------------------------------------------- */ |
| 59 | |
| 60 | void ir_input_init(struct input_dev *dev, struct ir_input_state *ir, |
| 61 | int ir_type, IR_KEYTAB_TYPE *ir_codes) |
| 62 | { |
| 63 | int i; |
| 64 | |
| 65 | ir->ir_type = ir_type; |
| 66 | if (ir_codes) |
| 67 | memcpy(ir->ir_codes, ir_codes, sizeof(ir->ir_codes)); |
| 68 | |
| 69 | |
| 70 | dev->keycode = ir->ir_codes; |
| 71 | dev->keycodesize = sizeof(IR_KEYTAB_TYPE); |
| 72 | dev->keycodemax = IR_KEYTAB_SIZE; |
| 73 | for (i = 0; i < IR_KEYTAB_SIZE; i++) |
| 74 | set_bit(ir->ir_codes[i], dev->keybit); |
| 75 | clear_bit(0, dev->keybit); |
| 76 | |
| 77 | set_bit(EV_KEY, dev->evbit); |
| 78 | if (repeat) |
| 79 | set_bit(EV_REP, dev->evbit); |
| 80 | } |
| 81 | |
| 82 | void ir_input_nokey(struct input_dev *dev, struct ir_input_state *ir) |
| 83 | { |
| 84 | if (ir->keypressed) { |
| 85 | ir->keypressed = 0; |
| 86 | ir_input_key_event(dev,ir); |
| 87 | } |
| 88 | } |
| 89 | |
| 90 | void ir_input_keydown(struct input_dev *dev, struct ir_input_state *ir, |
| 91 | u32 ir_key, u32 ir_raw) |
| 92 | { |
| 93 | u32 keycode = IR_KEYCODE(ir->ir_codes, ir_key); |
| 94 | |
| 95 | if (ir->keypressed && ir->keycode != keycode) { |
| 96 | ir->keypressed = 0; |
| 97 | ir_input_key_event(dev,ir); |
| 98 | } |
| 99 | if (!ir->keypressed) { |
| 100 | ir->ir_key = ir_key; |
| 101 | ir->ir_raw = ir_raw; |
| 102 | ir->keycode = keycode; |
| 103 | ir->keypressed = 1; |
| 104 | ir_input_key_event(dev,ir); |
| 105 | } |
| 106 | } |
| 107 | |
| 108 | /* -------------------------------------------------------------------------- */ |
| 109 | |
| 110 | u32 ir_extract_bits(u32 data, u32 mask) |
| 111 | { |
| 112 | int mbit, vbit; |
| 113 | u32 value; |
| 114 | |
| 115 | value = 0; |
| 116 | vbit = 0; |
| 117 | for (mbit = 0; mbit < 32; mbit++) { |
| 118 | if (!(mask & ((u32)1 << mbit))) |
| 119 | continue; |
| 120 | if (data & ((u32)1 << mbit)) |
| 121 | value |= (1 << vbit); |
| 122 | vbit++; |
| 123 | } |
| 124 | return value; |
| 125 | } |
| 126 | |
| 127 | static int inline getbit(u32 *samples, int bit) |
| 128 | { |
| 129 | return (samples[bit/32] & (1 << (31-(bit%32)))) ? 1 : 0; |
| 130 | } |
| 131 | |
| 132 | /* sump raw samples for visual debugging ;) */ |
| 133 | int ir_dump_samples(u32 *samples, int count) |
| 134 | { |
| 135 | int i, bit, start; |
| 136 | |
| 137 | printk(KERN_DEBUG "ir samples: "); |
| 138 | start = 0; |
| 139 | for (i = 0; i < count * 32; i++) { |
| 140 | bit = getbit(samples,i); |
| 141 | if (bit) |
| 142 | start = 1; |
| 143 | if (0 == start) |
| 144 | continue; |
| 145 | printk("%s", bit ? "#" : "_"); |
| 146 | } |
| 147 | printk("\n"); |
| 148 | return 0; |
| 149 | } |
| 150 | |
| 151 | /* decode raw samples, pulse distance coding used by NEC remotes */ |
| 152 | int ir_decode_pulsedistance(u32 *samples, int count, int low, int high) |
| 153 | { |
| 154 | int i,last,bit,len; |
| 155 | u32 curBit; |
| 156 | u32 value; |
| 157 | |
| 158 | /* find start burst */ |
| 159 | for (i = len = 0; i < count * 32; i++) { |
| 160 | bit = getbit(samples,i); |
| 161 | if (bit) { |
| 162 | len++; |
| 163 | } else { |
| 164 | if (len >= 29) |
| 165 | break; |
| 166 | len = 0; |
| 167 | } |
| 168 | } |
| 169 | |
| 170 | /* start burst to short */ |
| 171 | if (len < 29) |
| 172 | return 0xffffffff; |
| 173 | |
| 174 | /* find start silence */ |
| 175 | for (len = 0; i < count * 32; i++) { |
| 176 | bit = getbit(samples,i); |
| 177 | if (bit) { |
| 178 | break; |
| 179 | } else { |
| 180 | len++; |
| 181 | } |
| 182 | } |
| 183 | |
| 184 | /* silence to short */ |
| 185 | if (len < 7) |
| 186 | return 0xffffffff; |
| 187 | |
| 188 | /* go decoding */ |
| 189 | len = 0; |
| 190 | last = 1; |
| 191 | value = 0; curBit = 1; |
| 192 | for (; i < count * 32; i++) { |
| 193 | bit = getbit(samples,i); |
| 194 | if (last) { |
| 195 | if(bit) { |
| 196 | continue; |
| 197 | } else { |
| 198 | len = 1; |
| 199 | } |
| 200 | } else { |
| 201 | if (bit) { |
| 202 | if (len > (low + high) /2) |
| 203 | value |= curBit; |
| 204 | curBit <<= 1; |
| 205 | if (curBit == 1) |
| 206 | break; |
| 207 | } else { |
| 208 | len++; |
| 209 | } |
| 210 | } |
| 211 | last = bit; |
| 212 | } |
| 213 | |
| 214 | return value; |
| 215 | } |
| 216 | |
| 217 | /* decode raw samples, biphase coding, used by rc5 for example */ |
| 218 | int ir_decode_biphase(u32 *samples, int count, int low, int high) |
| 219 | { |
| 220 | int i,last,bit,len,flips; |
| 221 | u32 value; |
| 222 | |
| 223 | /* find start bit (1) */ |
| 224 | for (i = 0; i < 32; i++) { |
| 225 | bit = getbit(samples,i); |
| 226 | if (bit) |
| 227 | break; |
| 228 | } |
| 229 | |
| 230 | /* go decoding */ |
| 231 | len = 0; |
| 232 | flips = 0; |
| 233 | value = 1; |
| 234 | for (; i < count * 32; i++) { |
| 235 | if (len > high) |
| 236 | break; |
| 237 | if (flips > 1) |
| 238 | break; |
| 239 | last = bit; |
| 240 | bit = getbit(samples,i); |
| 241 | if (last == bit) { |
| 242 | len++; |
| 243 | continue; |
| 244 | } |
| 245 | if (len < low) { |
| 246 | len++; |
| 247 | flips++; |
| 248 | continue; |
| 249 | } |
| 250 | value <<= 1; |
| 251 | value |= bit; |
| 252 | flips = 0; |
| 253 | len = 1; |
| 254 | } |
| 255 | return value; |
| 256 | } |
| 257 | |
| 258 | EXPORT_SYMBOL_GPL(ir_input_init); |
| 259 | EXPORT_SYMBOL_GPL(ir_input_nokey); |
| 260 | EXPORT_SYMBOL_GPL(ir_input_keydown); |
| 261 | |
| 262 | EXPORT_SYMBOL_GPL(ir_extract_bits); |
| 263 | EXPORT_SYMBOL_GPL(ir_dump_samples); |
| 264 | EXPORT_SYMBOL_GPL(ir_decode_biphase); |
| 265 | EXPORT_SYMBOL_GPL(ir_decode_pulsedistance); |
| 266 | |
| 267 | /* |
| 268 | * Local variables: |
| 269 | * c-basic-offset: 8 |
| 270 | * End: |
| 271 | */ |
| 272 | |