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1// SPDX-License-Identifier: GPL-2.0-or-later2/*3 * ImgTec IR Decoder setup for Sharp protocol.4 *5 * Copyright 2012-2014 Imagination Technologies Ltd.6 */7 8#include "img-ir-hw.h"9 10/* Convert Sharp data to a scancode */11static int img_ir_sharp_scancode(int len, u64 raw, u64 enabled_protocols,12 struct img_ir_scancode_req *request)13{14 unsigned int addr, cmd, exp, chk;15 16 if (len != 15)17 return -EINVAL;18 19 addr = (raw >> 0) & 0x1f;20 cmd = (raw >> 5) & 0xff;21 exp = (raw >> 13) & 0x1;22 chk = (raw >> 14) & 0x1;23 24 /* validate data */25 if (!exp)26 return -EINVAL;27 if (chk)28 /* probably the second half of the message */29 return -EINVAL;30 31 request->protocol = RC_PROTO_SHARP;32 request->scancode = addr << 8 | cmd;33 return IMG_IR_SCANCODE;34}35 36/* Convert Sharp scancode to Sharp data filter */37static int img_ir_sharp_filter(const struct rc_scancode_filter *in,38 struct img_ir_filter *out, u64 protocols)39{40 unsigned int addr, cmd, exp = 0, chk = 0;41 unsigned int addr_m, cmd_m, exp_m = 0, chk_m = 0;42 43 addr = (in->data >> 8) & 0x1f;44 addr_m = (in->mask >> 8) & 0x1f;45 cmd = (in->data >> 0) & 0xff;46 cmd_m = (in->mask >> 0) & 0xff;47 if (cmd_m) {48 /* if filtering commands, we can only match the first part */49 exp = 1;50 exp_m = 1;51 chk = 0;52 chk_m = 1;53 }54 55 out->data = addr |56 cmd << 5 |57 exp << 13 |58 chk << 14;59 out->mask = addr_m |60 cmd_m << 5 |61 exp_m << 13 |62 chk_m << 14;63 64 return 0;65}66 67/*68 * Sharp decoder69 * See also http://www.sbprojects.com/knowledge/ir/sharp.php70 */71struct img_ir_decoder img_ir_sharp = {72 .type = RC_PROTO_BIT_SHARP,73 .control = {74 .decoden = 0,75 .decodend2 = 1,76 .code_type = IMG_IR_CODETYPE_PULSEDIST,77 .d1validsel = 1,78 },79 /* main timings */80 .tolerance = 20, /* 20% */81 .timings = {82 /* 0 symbol */83 .s10 = {84 .pulse = { 320 /* 320 us */ },85 .space = { 680 /* 1 ms period */ },86 },87 /* 1 symbol */88 .s11 = {89 .pulse = { 320 /* 320 us */ },90 .space = { 1680 /* 2 ms period */ },91 },92 /* free time */93 .ft = {94 .minlen = 15,95 .maxlen = 15,96 .ft_min = 5000, /* 5 ms */97 },98 },99 /* scancode logic */100 .scancode = img_ir_sharp_scancode,101 .filter = img_ir_sharp_filter,102};103