1 | // SPDX-License-Identifier: GPL-2.0-or-later |
2 | /* |
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 */ |
11 | static 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 */ |
37 | static 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 decoder |
69 | * See also http://www.sbprojects.com/knowledge/ir/sharp.php |
70 | */ |
71 | struct 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 | |