// SPDX-License-Identifier: GPL-2.0-or-later
/*
 * ImgTec IR Decoder setup for Philips RC-5 protocol.
 *
 * Copyright 2012-2014 Imagination Technologies Ltd.
 */

#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_PROTO_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_PROTO_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,
};