1*4882a593Smuzhiyun // SPDX-License-Identifier: GPL-2.0-or-later
2*4882a593Smuzhiyun /*
3*4882a593Smuzhiyun * ImgTec IR Decoder setup for Philips RC-5 protocol.
4*4882a593Smuzhiyun *
5*4882a593Smuzhiyun * Copyright 2012-2014 Imagination Technologies Ltd.
6*4882a593Smuzhiyun */
7*4882a593Smuzhiyun
8*4882a593Smuzhiyun #include "img-ir-hw.h"
9*4882a593Smuzhiyun
10*4882a593Smuzhiyun /* Convert RC5 data to a scancode */
img_ir_rc5_scancode(int len,u64 raw,u64 enabled_protocols,struct img_ir_scancode_req * request)11*4882a593Smuzhiyun static int img_ir_rc5_scancode(int len, u64 raw, u64 enabled_protocols,
12*4882a593Smuzhiyun struct img_ir_scancode_req *request)
13*4882a593Smuzhiyun {
14*4882a593Smuzhiyun unsigned int addr, cmd, tgl, start;
15*4882a593Smuzhiyun
16*4882a593Smuzhiyun /* Quirk in the decoder shifts everything by 2 to the left. */
17*4882a593Smuzhiyun raw >>= 2;
18*4882a593Smuzhiyun
19*4882a593Smuzhiyun start = (raw >> 13) & 0x01;
20*4882a593Smuzhiyun tgl = (raw >> 11) & 0x01;
21*4882a593Smuzhiyun addr = (raw >> 6) & 0x1f;
22*4882a593Smuzhiyun cmd = raw & 0x3f;
23*4882a593Smuzhiyun /*
24*4882a593Smuzhiyun * 12th bit is used to extend the command in extended RC5 and has
25*4882a593Smuzhiyun * no effect on standard RC5.
26*4882a593Smuzhiyun */
27*4882a593Smuzhiyun cmd += ((raw >> 12) & 0x01) ? 0 : 0x40;
28*4882a593Smuzhiyun
29*4882a593Smuzhiyun if (!start)
30*4882a593Smuzhiyun return -EINVAL;
31*4882a593Smuzhiyun
32*4882a593Smuzhiyun request->protocol = RC_PROTO_RC5;
33*4882a593Smuzhiyun request->scancode = addr << 8 | cmd;
34*4882a593Smuzhiyun request->toggle = tgl;
35*4882a593Smuzhiyun return IMG_IR_SCANCODE;
36*4882a593Smuzhiyun }
37*4882a593Smuzhiyun
38*4882a593Smuzhiyun /* Convert RC5 scancode to RC5 data filter */
img_ir_rc5_filter(const struct rc_scancode_filter * in,struct img_ir_filter * out,u64 protocols)39*4882a593Smuzhiyun static int img_ir_rc5_filter(const struct rc_scancode_filter *in,
40*4882a593Smuzhiyun struct img_ir_filter *out, u64 protocols)
41*4882a593Smuzhiyun {
42*4882a593Smuzhiyun /* Not supported by the hw. */
43*4882a593Smuzhiyun return -EINVAL;
44*4882a593Smuzhiyun }
45*4882a593Smuzhiyun
46*4882a593Smuzhiyun /*
47*4882a593Smuzhiyun * RC-5 decoder
48*4882a593Smuzhiyun * see http://www.sbprojects.com/knowledge/ir/rc5.php
49*4882a593Smuzhiyun */
50*4882a593Smuzhiyun struct img_ir_decoder img_ir_rc5 = {
51*4882a593Smuzhiyun .type = RC_PROTO_BIT_RC5,
52*4882a593Smuzhiyun .control = {
53*4882a593Smuzhiyun .bitoriend2 = 1,
54*4882a593Smuzhiyun .code_type = IMG_IR_CODETYPE_BIPHASE,
55*4882a593Smuzhiyun .decodend2 = 1,
56*4882a593Smuzhiyun },
57*4882a593Smuzhiyun /* main timings */
58*4882a593Smuzhiyun .tolerance = 16,
59*4882a593Smuzhiyun .unit = 888888, /* 1/36k*32=888.888microseconds */
60*4882a593Smuzhiyun .timings = {
61*4882a593Smuzhiyun /* 10 symbol */
62*4882a593Smuzhiyun .s10 = {
63*4882a593Smuzhiyun .pulse = { 1 },
64*4882a593Smuzhiyun .space = { 1 },
65*4882a593Smuzhiyun },
66*4882a593Smuzhiyun
67*4882a593Smuzhiyun /* 11 symbol */
68*4882a593Smuzhiyun .s11 = {
69*4882a593Smuzhiyun .pulse = { 1 },
70*4882a593Smuzhiyun .space = { 1 },
71*4882a593Smuzhiyun },
72*4882a593Smuzhiyun
73*4882a593Smuzhiyun /* free time */
74*4882a593Smuzhiyun .ft = {
75*4882a593Smuzhiyun .minlen = 14,
76*4882a593Smuzhiyun .maxlen = 14,
77*4882a593Smuzhiyun .ft_min = 5,
78*4882a593Smuzhiyun },
79*4882a593Smuzhiyun },
80*4882a593Smuzhiyun
81*4882a593Smuzhiyun /* scancode logic */
82*4882a593Smuzhiyun .scancode = img_ir_rc5_scancode,
83*4882a593Smuzhiyun .filter = img_ir_rc5_filter,
84*4882a593Smuzhiyun };
85