// SPDX-License-Identifier: GPL-2.0-or-later
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/*
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* ImgTec IR Decoder setup for NEC protocol.
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*
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* Copyright 2010-2014 Imagination Technologies Ltd.
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*/
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#include "img-ir-hw.h"
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#include <linux/bitrev.h>
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#include <linux/log2.h>
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/* Convert NEC data to a scancode */
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static int img_ir_nec_scancode(int len, u64 raw, u64 enabled_protocols,
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struct img_ir_scancode_req *request)
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{
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unsigned int addr, addr_inv, data, data_inv;
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/* a repeat code has no data */
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if (!len)
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return IMG_IR_REPEATCODE;
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if (len != 32)
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return -EINVAL;
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/* raw encoding: ddDDaaAA */
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addr = (raw >> 0) & 0xff;
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addr_inv = (raw >> 8) & 0xff;
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data = (raw >> 16) & 0xff;
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data_inv = (raw >> 24) & 0xff;
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if ((data_inv ^ data) != 0xff) {
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/* 32-bit NEC (used by Apple and TiVo remotes) */
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/* scan encoding: as transmitted, MSBit = first received bit */
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request->scancode = bitrev8(addr) << 24 |
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bitrev8(addr_inv) << 16 |
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bitrev8(data) << 8 |
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bitrev8(data_inv);
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request->protocol = RC_PROTO_NEC32;
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} else if ((addr_inv ^ addr) != 0xff) {
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/* Extended NEC */
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/* scan encoding: AAaaDD */
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request->scancode = addr << 16 |
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addr_inv << 8 |
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data;
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request->protocol = RC_PROTO_NECX;
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} else {
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/* Normal NEC */
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/* scan encoding: AADD */
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request->scancode = addr << 8 |
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data;
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request->protocol = RC_PROTO_NEC;
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}
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return IMG_IR_SCANCODE;
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}
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/* Convert NEC scancode to NEC data filter */
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static int img_ir_nec_filter(const struct rc_scancode_filter *in,
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struct img_ir_filter *out, u64 protocols)
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{
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unsigned int addr, addr_inv, data, data_inv;
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unsigned int addr_m, addr_inv_m, data_m, data_inv_m;
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data = in->data & 0xff;
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data_m = in->mask & 0xff;
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protocols &= RC_PROTO_BIT_NEC | RC_PROTO_BIT_NECX | RC_PROTO_BIT_NEC32;
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/*
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* If only one bit is set, we were requested to do an exact
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* protocol. This should be the case for wakeup filters; for
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* normal filters, guess the protocol from the scancode.
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*/
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if (!is_power_of_2(protocols)) {
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if ((in->data | in->mask) & 0xff000000)
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protocols = RC_PROTO_BIT_NEC32;
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else if ((in->data | in->mask) & 0x00ff0000)
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protocols = RC_PROTO_BIT_NECX;
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else
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protocols = RC_PROTO_BIT_NEC;
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}
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if (protocols == RC_PROTO_BIT_NEC32) {
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/* 32-bit NEC (used by Apple and TiVo remotes) */
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/* scan encoding: as transmitted, MSBit = first received bit */
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addr = bitrev8(in->data >> 24);
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addr_m = bitrev8(in->mask >> 24);
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addr_inv = bitrev8(in->data >> 16);
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addr_inv_m = bitrev8(in->mask >> 16);
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data = bitrev8(in->data >> 8);
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data_m = bitrev8(in->mask >> 8);
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data_inv = bitrev8(in->data >> 0);
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data_inv_m = bitrev8(in->mask >> 0);
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} else if (protocols == RC_PROTO_BIT_NECX) {
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/* Extended NEC */
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/* scan encoding AAaaDD */
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addr = (in->data >> 16) & 0xff;
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addr_m = (in->mask >> 16) & 0xff;
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addr_inv = (in->data >> 8) & 0xff;
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addr_inv_m = (in->mask >> 8) & 0xff;
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data_inv = data ^ 0xff;
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data_inv_m = data_m;
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} else {
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/* Normal NEC */
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/* scan encoding: AADD */
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addr = (in->data >> 8) & 0xff;
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addr_m = (in->mask >> 8) & 0xff;
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addr_inv = addr ^ 0xff;
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addr_inv_m = addr_m;
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data_inv = data ^ 0xff;
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data_inv_m = data_m;
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}
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/* raw encoding: ddDDaaAA */
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out->data = data_inv << 24 |
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data << 16 |
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addr_inv << 8 |
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addr;
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out->mask = data_inv_m << 24 |
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data_m << 16 |
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addr_inv_m << 8 |
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addr_m;
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return 0;
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}
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/*
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* NEC decoder
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* See also http://www.sbprojects.com/knowledge/ir/nec.php
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* http://wiki.altium.com/display/ADOH/NEC+Infrared+Transmission+Protocol
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*/
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struct img_ir_decoder img_ir_nec = {
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.type = RC_PROTO_BIT_NEC | RC_PROTO_BIT_NECX | RC_PROTO_BIT_NEC32,
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.control = {
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.decoden = 1,
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.code_type = IMG_IR_CODETYPE_PULSEDIST,
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},
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/* main timings */
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.unit = 562500, /* 562.5 us */
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.timings = {
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/* leader symbol */
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.ldr = {
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.pulse = { 16 /* 9ms */ },
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.space = { 8 /* 4.5ms */ },
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},
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/* 0 symbol */
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.s00 = {
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.pulse = { 1 /* 562.5 us */ },
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.space = { 1 /* 562.5 us */ },
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},
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/* 1 symbol */
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.s01 = {
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.pulse = { 1 /* 562.5 us */ },
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.space = { 3 /* 1687.5 us */ },
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},
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/* free time */
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.ft = {
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.minlen = 32,
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.maxlen = 32,
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.ft_min = 10, /* 5.625 ms */
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},
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},
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/* repeat codes */
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.repeat = 108, /* 108 ms */
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.rtimings = {
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/* leader symbol */
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.ldr = {
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.space = { 4 /* 2.25 ms */ },
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},
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/* free time */
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.ft = {
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.minlen = 0, /* repeat code has no data */
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.maxlen = 0,
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},
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},
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/* scancode logic */
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.scancode = img_ir_nec_scancode,
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.filter = img_ir_nec_filter,
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};
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