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 */
img_ir_sharp_scancode(int len,u64 raw,u64 enabled_protocols,struct img_ir_scancode_req * request)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 */
img_ir_sharp_filter(const struct rc_scancode_filter * in,struct img_ir_filter * out,u64 protocols)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