rc/img-ir/img-ir-sharp.c

0001 // SPDX-License-Identifier: GPL-2.0-or-later
0002 /*
0003  * ImgTec IR Decoder setup for Sharp protocol.
0004  *
0005  * Copyright 2012-2014 Imagination Technologies Ltd.
0006  */
0007
0008 #include "img-ir-hw.h"
0009
0010 /* Convert Sharp data to a scancode */
0011 static int img_ir_sharp_scancode(int len, u64 raw, u64 enabled_protocols,
0012                  struct img_ir_scancode_req *request)
0013 {
0014     unsigned int addr, cmd, exp, chk;
0015
0016     if (len != 15)
0017         return -EINVAL;
0018
0019     addr = (raw >>   0) & 0x1f;
0020     cmd  = (raw >>   5) & 0xff;
0021     exp  = (raw >>  13) &  0x1;
0022     chk  = (raw >>  14) &  0x1;
0023
0024     /* validate data */
0025     if (!exp)
0026         return -EINVAL;
0027     if (chk)
0028         /* probably the second half of the message */
0029         return -EINVAL;
0030
0031     request->protocol = RC_PROTO_SHARP;
0032     request->scancode = addr << 8 | cmd;
0033     return IMG_IR_SCANCODE;
0034 }
0035
0036 /* Convert Sharp scancode to Sharp data filter */
0037 static int img_ir_sharp_filter(const struct rc_scancode_filter *in,
0038                    struct img_ir_filter *out, u64 protocols)
0039 {
0040     unsigned int addr, cmd, exp = 0, chk = 0;
0041     unsigned int addr_m, cmd_m, exp_m = 0, chk_m = 0;
0042
0043     addr   = (in->data >> 8) & 0x1f;
0044     addr_m = (in->mask >> 8) & 0x1f;
0045     cmd    = (in->data >> 0) & 0xff;
0046     cmd_m  = (in->mask >> 0) & 0xff;
0047     if (cmd_m) {
0048         /* if filtering commands, we can only match the first part */
0049         exp   = 1;
0050         exp_m = 1;
0051         chk   = 0;
0052         chk_m = 1;
0053     }
0054
0055     out->data = addr        |
0056             cmd   <<  5 |
0057             exp   << 13 |
0058             chk   << 14;
0059     out->mask = addr_m      |
0060             cmd_m <<  5 |
0061             exp_m << 13 |
0062             chk_m << 14;
0063
0064     return 0;
0065 }
0066
0067 /*
0068  * Sharp decoder
0069  * See also http://www.sbprojects.com/knowledge/ir/sharp.php
0070  */
0071 struct img_ir_decoder img_ir_sharp = {
0072     .type = RC_PROTO_BIT_SHARP,
0073     .control = {
0074         .decoden = 0,
0075         .decodend2 = 1,
0076         .code_type = IMG_IR_CODETYPE_PULSEDIST,
0077         .d1validsel = 1,
0078     },
0079     /* main timings */
0080     .tolerance = 20,    /* 20% */
0081     .timings = {
0082         /* 0 symbol */
0083         .s10 = {
0084             .pulse = { 320  /* 320 us */ },
0085             .space = { 680  /* 1 ms period */ },
0086         },
0087         /* 1 symbol */
0088         .s11 = {
0089             .pulse = { 320  /* 320 us */ },
0090             .space = { 1680 /* 2 ms period */ },
0091         },
0092         /* free time */
0093         .ft = {
0094             .minlen = 15,
0095             .maxlen = 15,
0096             .ft_min = 5000, /* 5 ms */
0097         },
0098     },
0099     /* scancode logic */
0100     .scancode = img_ir_sharp_scancode,
0101     .filter = img_ir_sharp_filter,
0102 };