3 * some common structs and functions to handle infrared remotes via
6 * (c) 2003 Gerd Knorr <kraxel@bytesex.org> [SuSE Labs]
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.
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.
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
23 #include <linux/module.h>
24 #include <linux/string.h>
25 #include <linux/jiffies.h>
26 #include <media/ir-common.h>
28 /* -------------------------------------------------------------------------- */
30 MODULE_AUTHOR("Gerd Knorr <kraxel@bytesex.org> [SuSE Labs]");
31 MODULE_LICENSE("GPL");
33 static int repeat = 1;
34 module_param(repeat, int, 0444);
35 MODULE_PARM_DESC(repeat,"auto-repeat for IR keys (default: on)");
37 /* -------------------------------------------------------------------------- */
39 static void ir_input_key_event(struct input_dev *dev, struct ir_input_state *ir)
41 if (KEY_RESERVED == ir->keycode) {
42 printk(KERN_INFO "%s: unknown key: key=0x%02x down=%d\n",
43 dev->name, ir->ir_key, ir->keypressed);
46 IR_dprintk(1,"%s: key event code=%d down=%d\n",
47 dev->name,ir->keycode,ir->keypressed);
48 input_report_key(dev,ir->keycode,ir->keypressed);
52 /* -------------------------------------------------------------------------- */
54 int ir_input_init(struct input_dev *dev, struct ir_input_state *ir,
57 ir->ir_type = ir_type;
60 set_bit(EV_REP, dev->evbit);
64 EXPORT_SYMBOL_GPL(ir_input_init);
67 void ir_input_nokey(struct input_dev *dev, struct ir_input_state *ir)
71 ir_input_key_event(dev,ir);
74 EXPORT_SYMBOL_GPL(ir_input_nokey);
76 void ir_input_keydown(struct input_dev *dev, struct ir_input_state *ir,
79 u32 keycode = ir_g_keycode_from_table(dev, ir_key);
81 if (ir->keypressed && ir->keycode != keycode) {
83 ir_input_key_event(dev,ir);
85 if (!ir->keypressed) {
87 ir->keycode = keycode;
89 ir_input_key_event(dev,ir);
92 EXPORT_SYMBOL_GPL(ir_input_keydown);
94 /* -------------------------------------------------------------------------- */
95 /* extract mask bits out of data and pack them into the result */
96 u32 ir_extract_bits(u32 data, u32 mask)
98 u32 vbit = 1, value = 0;
111 EXPORT_SYMBOL_GPL(ir_extract_bits);
113 static int inline getbit(u32 *samples, int bit)
115 return (samples[bit/32] & (1 << (31-(bit%32)))) ? 1 : 0;
118 /* sump raw samples for visual debugging ;) */
119 int ir_dump_samples(u32 *samples, int count)
123 printk(KERN_DEBUG "ir samples: ");
125 for (i = 0; i < count * 32; i++) {
126 bit = getbit(samples,i);
131 printk("%s", bit ? "#" : "_");
136 EXPORT_SYMBOL_GPL(ir_dump_samples);
138 /* decode raw samples, pulse distance coding used by NEC remotes */
139 int ir_decode_pulsedistance(u32 *samples, int count, int low, int high)
145 /* find start burst */
146 for (i = len = 0; i < count * 32; i++) {
147 bit = getbit(samples,i);
157 /* start burst to short */
161 /* find start silence */
162 for (len = 0; i < count * 32; i++) {
163 bit = getbit(samples,i);
171 /* silence to short */
178 value = 0; curBit = 1;
179 for (; i < count * 32; i++) {
180 bit = getbit(samples,i);
189 if (len > (low + high) /2)
203 EXPORT_SYMBOL_GPL(ir_decode_pulsedistance);
205 /* decode raw samples, biphase coding, used by rc5 for example */
206 int ir_decode_biphase(u32 *samples, int count, int low, int high)
208 int i,last,bit,len,flips;
211 /* find start bit (1) */
212 for (i = 0; i < 32; i++) {
213 bit = getbit(samples,i);
222 for (; i < count * 32; i++) {
228 bit = getbit(samples,i);
245 EXPORT_SYMBOL_GPL(ir_decode_biphase);
247 /* RC5 decoding stuff, moved from bttv-input.c to share it with
250 /* decode raw bit pattern to RC5 code */
251 u32 ir_rc5_decode(unsigned int code)
253 unsigned int org_code = code;
255 unsigned int rc5 = 0;
258 for (i = 0; i < 14; ++i) {
271 IR_dprintk(1, "ir-common: ir_rc5_decode(%x) bad code\n", org_code);
275 IR_dprintk(1, "ir-common: code=%x, rc5=%x, start=%x, toggle=%x, address=%x, "
276 "instr=%x\n", rc5, org_code, RC5_START(rc5),
277 RC5_TOGGLE(rc5), RC5_ADDR(rc5), RC5_INSTR(rc5));
280 EXPORT_SYMBOL_GPL(ir_rc5_decode);
282 void ir_rc5_timer_end(unsigned long data)
284 struct card_ir *ir = (struct card_ir *)data;
286 unsigned long current_jiffies, timeout;
291 current_jiffies = jiffies;
292 do_gettimeofday(&tv);
294 /* avoid overflow with gap >1s */
295 if (tv.tv_sec - ir->base_time.tv_sec > 1) {
298 gap = 1000000 * (tv.tv_sec - ir->base_time.tv_sec) +
299 tv.tv_usec - ir->base_time.tv_usec;
302 /* signal we're ready to start a new code */
305 /* Allow some timer jitter (RC5 is ~24ms anyway so this is ok) */
307 IR_dprintk(1, "ir-common: spurious timer_end\n");
311 if (ir->last_bit < 20) {
312 /* ignore spurious codes (caused by light/other remotes) */
313 IR_dprintk(1, "ir-common: short code: %x\n", ir->code);
315 ir->code = (ir->code << ir->shift_by) | 1;
316 rc5 = ir_rc5_decode(ir->code);
318 /* two start bits? */
319 if (RC5_START(rc5) != ir->start) {
320 IR_dprintk(1, "ir-common: rc5 start bits invalid: %u\n", RC5_START(rc5));
323 } else if (RC5_ADDR(rc5) == ir->addr) {
324 u32 toggle = RC5_TOGGLE(rc5);
325 u32 instr = RC5_INSTR(rc5);
327 /* Good code, decide if repeat/repress */
328 if (toggle != RC5_TOGGLE(ir->last_rc5) ||
329 instr != RC5_INSTR(ir->last_rc5)) {
330 IR_dprintk(1, "ir-common: instruction %x, toggle %x\n", instr,
332 ir_input_nokey(ir->dev, &ir->ir);
333 ir_input_keydown(ir->dev, &ir->ir, instr);
336 /* Set/reset key-up timer */
337 timeout = current_jiffies +
338 msecs_to_jiffies(ir->rc5_key_timeout);
339 mod_timer(&ir->timer_keyup, timeout);
341 /* Save code for repeat test */
346 EXPORT_SYMBOL_GPL(ir_rc5_timer_end);
348 void ir_rc5_timer_keyup(unsigned long data)
350 struct card_ir *ir = (struct card_ir *)data;
352 IR_dprintk(1, "ir-common: key released\n");
353 ir_input_nokey(ir->dev, &ir->ir);
355 EXPORT_SYMBOL_GPL(ir_rc5_timer_keyup);