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