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https://github.com/torvalds/linux
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f62de675f7
As protocol decoders are specific to InfraRed, keep their names as-is. Signed-off-by: Mauro Carvalho Chehab <mchehab@redhat.com>
121 lines
3.2 KiB
C
121 lines
3.2 KiB
C
/*
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* some common functions to handle infrared remote protocol decoding for
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* drivers which have not yet been (or can't be) converted to use the
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* regular protocol decoders...
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*
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* (c) 2003 Gerd Knorr <kraxel@bytesex.org> [SuSE Labs]
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*
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* This program is free software; you can redistribute it and/or modify
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* it under the terms of the GNU General Public License as published by
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* the Free Software Foundation; either version 2 of the License, or
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* (at your option) any later version.
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*
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* This program is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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* GNU General Public License for more details.
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*
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* You should have received a copy of the GNU General Public License
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* along with this program; if not, write to the Free Software
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* Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
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*/
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#include <linux/module.h>
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#include <linux/string.h>
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#include <linux/jiffies.h>
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#include <media/ir-common.h>
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#include "rc-core-priv.h"
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/* -------------------------------------------------------------------------- */
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MODULE_AUTHOR("Gerd Knorr <kraxel@bytesex.org> [SuSE Labs]");
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MODULE_LICENSE("GPL");
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/* RC5 decoding stuff, moved from bttv-input.c to share it with
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* saa7134 */
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/* decode raw bit pattern to RC5 code */
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static u32 ir_rc5_decode(unsigned int code)
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{
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unsigned int org_code = code;
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unsigned int pair;
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unsigned int rc5 = 0;
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int i;
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for (i = 0; i < 14; ++i) {
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pair = code & 0x3;
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code >>= 2;
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rc5 <<= 1;
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switch (pair) {
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case 0:
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case 2:
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break;
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case 1:
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rc5 |= 1;
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break;
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case 3:
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IR_dprintk(1, "ir-common: ir_rc5_decode(%x) bad code\n", org_code);
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return 0;
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}
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}
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IR_dprintk(1, "ir-common: code=%x, rc5=%x, start=%x, toggle=%x, address=%x, "
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"instr=%x\n", rc5, org_code, RC5_START(rc5),
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RC5_TOGGLE(rc5), RC5_ADDR(rc5), RC5_INSTR(rc5));
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return rc5;
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}
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void ir_rc5_timer_end(unsigned long data)
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{
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struct card_ir *ir = (struct card_ir *)data;
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struct timeval tv;
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unsigned long current_jiffies;
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u32 gap;
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u32 rc5 = 0;
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/* get time */
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current_jiffies = jiffies;
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do_gettimeofday(&tv);
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/* avoid overflow with gap >1s */
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if (tv.tv_sec - ir->base_time.tv_sec > 1) {
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gap = 200000;
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} else {
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gap = 1000000 * (tv.tv_sec - ir->base_time.tv_sec) +
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tv.tv_usec - ir->base_time.tv_usec;
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}
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/* signal we're ready to start a new code */
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ir->active = 0;
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/* Allow some timer jitter (RC5 is ~24ms anyway so this is ok) */
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if (gap < 28000) {
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IR_dprintk(1, "ir-common: spurious timer_end\n");
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return;
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}
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if (ir->last_bit < 20) {
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/* ignore spurious codes (caused by light/other remotes) */
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IR_dprintk(1, "ir-common: short code: %x\n", ir->code);
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} else {
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ir->code = (ir->code << ir->shift_by) | 1;
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rc5 = ir_rc5_decode(ir->code);
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/* two start bits? */
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if (RC5_START(rc5) != ir->start) {
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IR_dprintk(1, "ir-common: rc5 start bits invalid: %u\n", RC5_START(rc5));
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/* right address? */
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} else if (RC5_ADDR(rc5) == ir->addr) {
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u32 toggle = RC5_TOGGLE(rc5);
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u32 instr = RC5_INSTR(rc5);
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/* Good code */
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ir_keydown(ir->dev, instr, toggle);
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IR_dprintk(1, "ir-common: instruction %x, toggle %x\n",
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instr, toggle);
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}
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}
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}
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EXPORT_SYMBOL_GPL(ir_rc5_timer_end);
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