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- /*
- * ImgTec IR Decoder setup for Philips RC-5 protocol.
- *
- * Copyright 2012-2014 Imagination Technologies Ltd.
- *
- * This program is free software; you can redistribute it and/or modify
- * it under the terms of the GNU General Public License as published by the
- * Free Software Foundation; either version 2 of the License, or (at your
- * option) any later version.
- */
- #include "img-ir-hw.h"
- /* Convert RC5 data to a scancode */
- static int img_ir_rc5_scancode(int len, u64 raw, u64 enabled_protocols,
- struct img_ir_scancode_req *request)
- {
- unsigned int addr, cmd, tgl, start;
- /* Quirk in the decoder shifts everything by 2 to the left. */
- raw >>= 2;
- start = (raw >> 13) & 0x01;
- tgl = (raw >> 11) & 0x01;
- addr = (raw >> 6) & 0x1f;
- cmd = raw & 0x3f;
- /*
- * 12th bit is used to extend the command in extended RC5 and has
- * no effect on standard RC5.
- */
- cmd += ((raw >> 12) & 0x01) ? 0 : 0x40;
- if (!start)
- return -EINVAL;
- request->protocol = RC_TYPE_RC5;
- request->scancode = addr << 8 | cmd;
- request->toggle = tgl;
- return IMG_IR_SCANCODE;
- }
- /* Convert RC5 scancode to RC5 data filter */
- static int img_ir_rc5_filter(const struct rc_scancode_filter *in,
- struct img_ir_filter *out, u64 protocols)
- {
- /* Not supported by the hw. */
- return -EINVAL;
- }
- /*
- * RC-5 decoder
- * see http://www.sbprojects.com/knowledge/ir/rc5.php
- */
- struct img_ir_decoder img_ir_rc5 = {
- .type = RC_BIT_RC5,
- .control = {
- .bitoriend2 = 1,
- .code_type = IMG_IR_CODETYPE_BIPHASE,
- .decodend2 = 1,
- },
- /* main timings */
- .tolerance = 16,
- .unit = 888888, /* 1/36k*32=888.888microseconds */
- .timings = {
- /* 10 symbol */
- .s10 = {
- .pulse = { 1 },
- .space = { 1 },
- },
- /* 11 symbol */
- .s11 = {
- .pulse = { 1 },
- .space = { 1 },
- },
- /* free time */
- .ft = {
- .minlen = 14,
- .maxlen = 14,
- .ft_min = 5,
- },
- },
- /* scancode logic */
- .scancode = img_ir_rc5_scancode,
- .filter = img_ir_rc5_filter,
- };
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