2 * some common functions to handle infrared remote protocol decoding for
3 * drivers which have not yet been (or can't be) converted to use the
4 * regular protocol decoders...
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>
27 #include "ir-core-priv.h"
29 /* -------------------------------------------------------------------------- */
31 MODULE_AUTHOR("Gerd Knorr <kraxel@bytesex.org> [SuSE Labs]");
32 MODULE_LICENSE("GPL");
34 /* RC5 decoding stuff, moved from bttv-input.c to share it with
37 /* decode raw bit pattern to RC5 code */
38 static u32 ir_rc5_decode(unsigned int code)
40 unsigned int org_code = code;
45 for (i = 0; i < 14; ++i) {
58 IR_dprintk(1, "ir-common: ir_rc5_decode(%x) bad code\n", org_code);
62 IR_dprintk(1, "ir-common: code=%x, rc5=%x, start=%x, toggle=%x, address=%x, "
63 "instr=%x\n", rc5, org_code, RC5_START(rc5),
64 RC5_TOGGLE(rc5), RC5_ADDR(rc5), RC5_INSTR(rc5));
68 void ir_rc5_timer_end(unsigned long data)
70 struct card_ir *ir = (struct card_ir *)data;
72 unsigned long current_jiffies;
77 current_jiffies = jiffies;
80 /* avoid overflow with gap >1s */
81 if (tv.tv_sec - ir->base_time.tv_sec > 1) {
84 gap = 1000000 * (tv.tv_sec - ir->base_time.tv_sec) +
85 tv.tv_usec - ir->base_time.tv_usec;
88 /* signal we're ready to start a new code */
91 /* Allow some timer jitter (RC5 is ~24ms anyway so this is ok) */
93 IR_dprintk(1, "ir-common: spurious timer_end\n");
97 if (ir->last_bit < 20) {
98 /* ignore spurious codes (caused by light/other remotes) */
99 IR_dprintk(1, "ir-common: short code: %x\n", ir->code);
101 ir->code = (ir->code << ir->shift_by) | 1;
102 rc5 = ir_rc5_decode(ir->code);
104 /* two start bits? */
105 if (RC5_START(rc5) != ir->start) {
106 IR_dprintk(1, "ir-common: rc5 start bits invalid: %u\n", RC5_START(rc5));
109 } else if (RC5_ADDR(rc5) == ir->addr) {
110 u32 toggle = RC5_TOGGLE(rc5);
111 u32 instr = RC5_INSTR(rc5);
114 ir_keydown(ir->dev, instr, toggle);
115 IR_dprintk(1, "ir-common: instruction %x, toggle %x\n",
120 EXPORT_SYMBOL_GPL(ir_rc5_timer_end);