1 /* 2 * ImgTec IR Decoder setup for Philips RC-5 protocol. 3 * 4 * Copyright 2012-2014 Imagination Technologies Ltd. 5 * 6 * This program is free software; you can redistribute it and/or modify 7 * it under the terms of the GNU General Public License as published by the 8 * Free Software Foundation; either version 2 of the License, or (at your 9 * option) any later version. 10 */ 11 12 #include "img-ir-hw.h" 13 14 /* Convert RC5 data to a scancode */ 15 static int img_ir_rc5_scancode(int len, u64 raw, u64 enabled_protocols, 16 struct img_ir_scancode_req *request) 17 { 18 unsigned int addr, cmd, tgl, start; 19 20 /* Quirk in the decoder shifts everything by 2 to the left. */ 21 raw >>= 2; 22 23 start = (raw >> 13) & 0x01; 24 tgl = (raw >> 11) & 0x01; 25 addr = (raw >> 6) & 0x1f; 26 cmd = raw & 0x3f; 27 /* 28 * 12th bit is used to extend the command in extended RC5 and has 29 * no effect on standard RC5. 30 */ 31 cmd += ((raw >> 12) & 0x01) ? 0 : 0x40; 32 33 if (!start) 34 return -EINVAL; 35 36 request->protocol = RC_TYPE_RC5; 37 request->scancode = addr << 8 | cmd; 38 request->toggle = tgl; 39 return IMG_IR_SCANCODE; 40 } 41 42 /* Convert RC5 scancode to RC5 data filter */ 43 static int img_ir_rc5_filter(const struct rc_scancode_filter *in, 44 struct img_ir_filter *out, u64 protocols) 45 { 46 /* Not supported by the hw. */ 47 return -EINVAL; 48 } 49 50 /* 51 * RC-5 decoder 52 * see http://www.sbprojects.com/knowledge/ir/rc5.php 53 */ 54 struct img_ir_decoder img_ir_rc5 = { 55 .type = RC_BIT_RC5, 56 .control = { 57 .bitoriend2 = 1, 58 .code_type = IMG_IR_CODETYPE_BIPHASE, 59 .decodend2 = 1, 60 }, 61 /* main timings */ 62 .tolerance = 16, 63 .unit = 888888, /* 1/36k*32=888.888microseconds */ 64 .timings = { 65 /* 10 symbol */ 66 .s10 = { 67 .pulse = { 1 }, 68 .space = { 1 }, 69 }, 70 71 /* 11 symbol */ 72 .s11 = { 73 .pulse = { 1 }, 74 .space = { 1 }, 75 }, 76 77 /* free time */ 78 .ft = { 79 .minlen = 14, 80 .maxlen = 14, 81 .ft_min = 5, 82 }, 83 }, 84 85 /* scancode logic */ 86 .scancode = img_ir_rc5_scancode, 87 .filter = img_ir_rc5_filter, 88 }; 89