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

#include "img-ir-hw.h"

/* Convert Sharp data to a scancode */
static int img_ir_sharp_scancode(int len, u64 raw, u64 enabled_protocols,
                                 struct img_ir_scancode_req *request)
{
        unsigned int addr, cmd, exp, chk;

        if (len != 15)
                return -EINVAL;

        addr = (raw >>   0) & 0x1f;
        cmd  = (raw >>   5) & 0xff;
        exp  = (raw >>  13) &  0x1;
        chk  = (raw >>  14) &  0x1;

        /* validate data */
        if (!exp)
                return -EINVAL;
        if (chk)
                /* probably the second half of the message */
                return -EINVAL;

        request->protocol = RC_PROTO_SHARP;
        request->scancode = addr << 8 | cmd;
        return IMG_IR_SCANCODE;
}

/* Convert Sharp scancode to Sharp data filter */
static int img_ir_sharp_filter(const struct rc_scancode_filter *in,
                               struct img_ir_filter *out, u64 protocols)
{
        unsigned int addr, cmd, exp = 0, chk = 0;
        unsigned int addr_m, cmd_m, exp_m = 0, chk_m = 0;

        addr   = (in->data >> 8) & 0x1f;
        addr_m = (in->mask >> 8) & 0x1f;
        cmd    = (in->data >> 0) & 0xff;
        cmd_m  = (in->mask >> 0) & 0xff;
        if (cmd_m) {
                /* if filtering commands, we can only match the first part */
                exp   = 1;
                exp_m = 1;
                chk   = 0;
                chk_m = 1;
        }

        out->data = addr        |
                    cmd   <<  5 |
                    exp   << 13 |
                    chk   << 14;
        out->mask = addr_m      |
                    cmd_m <<  5 |
                    exp_m << 13 |
                    chk_m << 14;

        return 0;
}

/*
 * Sharp decoder
 * See also http://www.sbprojects.com/knowledge/ir/sharp.php
 */
struct img_ir_decoder img_ir_sharp = {
        .type = RC_PROTO_BIT_SHARP,
        .control = {
                .decoden = 0,
                .decodend2 = 1,
                .code_type = IMG_IR_CODETYPE_PULSEDIST,
                .d1validsel = 1,
        },
        /* main timings */
        .tolerance = 20,        /* 20% */
        .timings = {
                /* 0 symbol */
                .s10 = {
                        .pulse = { 320  /* 320 us */ },
                        .space = { 680  /* 1 ms period */ },
                },
                /* 1 symbol */
                .s11 = {
                        .pulse = { 320  /* 320 us */ },
                        .space = { 1680 /* 2 ms period */ },
                },
                /* free time */
                .ft = {
                        .minlen = 15,
                        .maxlen = 15,
                        .ft_min = 5000, /* 5 ms */
                },
        },
        /* scancode logic */
        .scancode = img_ir_sharp_scancode,
        .filter = img_ir_sharp_filter,
};