// SPDX-License-Identifier: GPL-2.0-or-later
/*
 * ImgTec IR Decoder setup for Sanyo protocol.
 *
 * Copyright 2012-2014 Imagination Technologies Ltd.
 *
 * From ir-sanyo-decoder.c:
 *
 * This protocol uses the NEC protocol timings. However, data is formatted as:
 *      13 bits Custom Code
 *      13 bits NOT(Custom Code)
 *      8 bits Key data
 *      8 bits NOT(Key data)
 *
 * According with LIRC, this protocol is used on Sanyo, Aiwa and Chinon
 * Information for this protocol is available at the Sanyo LC7461 datasheet.
 */

#include "img-ir-hw.h"

/* Convert Sanyo data to a scancode */
static int img_ir_sanyo_scancode(int len, u64 raw, u64 enabled_protocols,
                                 struct img_ir_scancode_req *request)
{
        unsigned int addr, addr_inv, data, data_inv;
        /* a repeat code has no data */
        if (!len)
                return IMG_IR_REPEATCODE;
        if (len != 42)
                return -EINVAL;
        addr     = (raw >>  0) & 0x1fff;
        addr_inv = (raw >> 13) & 0x1fff;
        data     = (raw >> 26) & 0xff;
        data_inv = (raw >> 34) & 0xff;
        /* Validate data */
        if ((data_inv ^ data) != 0xff)
                return -EINVAL;
        /* Validate address */
        if ((addr_inv ^ addr) != 0x1fff)
                return -EINVAL;

        /* Normal Sanyo */
        request->protocol = RC_PROTO_SANYO;
        request->scancode = addr << 8 | data;
        return IMG_IR_SCANCODE;
}

/* Convert Sanyo scancode to Sanyo data filter */
static int img_ir_sanyo_filter(const struct rc_scancode_filter *in,
                               struct img_ir_filter *out, u64 protocols)
{
        unsigned int addr, addr_inv, data, data_inv;
        unsigned int addr_m, data_m;

        data = in->data & 0xff;
        data_m = in->mask & 0xff;
        data_inv = data ^ 0xff;

        if (in->data & 0xff700000)
                return -EINVAL;

        addr       = (in->data >> 8) & 0x1fff;
        addr_m     = (in->mask >> 8) & 0x1fff;
        addr_inv   = addr ^ 0x1fff;

        out->data = (u64)data_inv << 34 |
                    (u64)data     << 26 |
                         addr_inv << 13 |
                         addr;
        out->mask = (u64)data_m << 34 |
                    (u64)data_m << 26 |
                         addr_m << 13 |
                         addr_m;
        return 0;
}

/* Sanyo decoder */
struct img_ir_decoder img_ir_sanyo = {
        .type = RC_PROTO_BIT_SANYO,
        .control = {
                .decoden = 1,
                .code_type = IMG_IR_CODETYPE_PULSEDIST,
        },
        /* main timings */
        .unit = 562500, /* 562.5 us */
        .timings = {
                /* leader symbol */
                .ldr = {
                        .pulse = { 16   /* 9ms */ },
                        .space = { 8    /* 4.5ms */ },
                },
                /* 0 symbol */
                .s00 = {
                        .pulse = { 1    /* 562.5 us */ },
                        .space = { 1    /* 562.5 us */ },
                },
                /* 1 symbol */
                .s01 = {
                        .pulse = { 1    /* 562.5 us */ },
                        .space = { 3    /* 1687.5 us */ },
                },
                /* free time */
                .ft = {
                        .minlen = 42,
                        .maxlen = 42,
                        .ft_min = 10,   /* 5.625 ms */
                },
        },
        /* repeat codes */
        .repeat = 108,                  /* 108 ms */
        .rtimings = {
                /* leader symbol */
                .ldr = {
                        .space = { 4    /* 2.25 ms */ },
                },
                /* free time */
                .ft = {
                        .minlen = 0,    /* repeat code has no data */
                        .maxlen = 0,
                },
        },
        /* scancode logic */
        .scancode = img_ir_sanyo_scancode,
        .filter = img_ir_sanyo_filter,
};