img-ir-sony.c

  1// SPDX-License-Identifier: GPL-2.0-or-later
  2/*
  3 * ImgTec IR Decoder setup for Sony (SIRC) protocol.
  4 *
  5 * Copyright 2012-2014 Imagination Technologies Ltd.
  6 */
  7
  8#include "img-ir-hw.h"
  9
 10/* Convert Sony data to a scancode */
 11static int img_ir_sony_scancode(int len, u64 raw, u64 enabled_protocols,
 12				struct img_ir_scancode_req *request)
 13{
 14	unsigned int dev, subdev, func;
 15
 16	switch (len) {
 17	case 12:
 18		if (!(enabled_protocols & RC_PROTO_BIT_SONY12))
 19			return -EINVAL;
 20		func   = raw & 0x7f;	/* first 7 bits */
 21		raw    >>= 7;
 22		dev    = raw & 0x1f;	/* next 5 bits */
 23		subdev = 0;
 24		request->protocol = RC_PROTO_SONY12;
 25		break;
 26	case 15:
 27		if (!(enabled_protocols & RC_PROTO_BIT_SONY15))
 28			return -EINVAL;
 29		func   = raw & 0x7f;	/* first 7 bits */
 30		raw    >>= 7;
 31		dev    = raw & 0xff;	/* next 8 bits */
 32		subdev = 0;
 33		request->protocol = RC_PROTO_SONY15;
 34		break;
 35	case 20:
 36		if (!(enabled_protocols & RC_PROTO_BIT_SONY20))
 37			return -EINVAL;
 38		func   = raw & 0x7f;	/* first 7 bits */
 39		raw    >>= 7;
 40		dev    = raw & 0x1f;	/* next 5 bits */
 41		raw    >>= 5;
 42		subdev = raw & 0xff;	/* next 8 bits */
 43		request->protocol = RC_PROTO_SONY20;
 44		break;
 45	default:
 46		return -EINVAL;
 47	}
 48	request->scancode = dev << 16 | subdev << 8 | func;
 49	return IMG_IR_SCANCODE;
 50}
 51
 52/* Convert NEC scancode to NEC data filter */
 53static int img_ir_sony_filter(const struct rc_scancode_filter *in,
 54			      struct img_ir_filter *out, u64 protocols)
 55{
 56	unsigned int dev, subdev, func;
 57	unsigned int dev_m, subdev_m, func_m;
 58	unsigned int len = 0;
 59
 60	dev      = (in->data >> 16) & 0xff;
 61	dev_m    = (in->mask >> 16) & 0xff;
 62	subdev   = (in->data >> 8)  & 0xff;
 63	subdev_m = (in->mask >> 8)  & 0xff;
 64	func     = (in->data >> 0)  & 0x7f;
 65	func_m   = (in->mask >> 0)  & 0x7f;
 66
 67	protocols &= RC_PROTO_BIT_SONY12 | RC_PROTO_BIT_SONY15 |
 68							RC_PROTO_BIT_SONY20;
 69
 70	/*
 71	 * If only one bit is set, we were requested to do an exact
 72	 * protocol. This should be the case for wakeup filters; for
 73	 * normal filters, guess the protocol from the scancode.
 74	 */
 75	if (!is_power_of_2(protocols)) {
 76		if (subdev & subdev_m)
 77			protocols = RC_PROTO_BIT_SONY20;
 78		else if (dev & dev_m & 0xe0)
 79			protocols = RC_PROTO_BIT_SONY15;
 80		else
 81			protocols = RC_PROTO_BIT_SONY12;
 82	}
 83
 84	if (protocols == RC_PROTO_BIT_SONY20) {
 85		/* can't encode subdev and higher device bits */
 86		if (dev & dev_m & 0xe0)
 87			return -EINVAL;
 88		len = 20;
 89		dev_m &= 0x1f;
 90	} else if (protocols == RC_PROTO_BIT_SONY15) {
 91		len = 15;
 92		subdev_m = 0;
 93	} else {
 94		/*
 95		 * The hardware mask cannot distinguish high device bits and low
 96		 * extended bits, so logically AND those bits of the masks
 97		 * together.
 98		 */
 99		subdev_m &= (dev_m >> 5) | 0xf8;
100		dev_m &= 0x1f;
101	}
102
103	/* ensure there aren't any bits straying between fields */
104	dev &= dev_m;
105	subdev &= subdev_m;
106
107	/* write the hardware filter */
108	out->data = func          |
109		    dev      << 7 |
110		    subdev   << 15;
111	out->mask = func_m        |
112		    dev_m    << 7 |
113		    subdev_m << 15;
114
115	if (len) {
116		out->minlen = len;
117		out->maxlen = len;
118	}
119	return 0;
120}
121
122/*
123 * Sony SIRC decoder
124 * See also http://www.sbprojects.com/knowledge/ir/sirc.php
125 *          http://picprojects.org.uk/projects/sirc/sonysirc.pdf
126 */
127struct img_ir_decoder img_ir_sony = {
128	.type = RC_PROTO_BIT_SONY12 | RC_PROTO_BIT_SONY15 | RC_PROTO_BIT_SONY20,
129	.control = {
130		.decoden = 1,
131		.code_type = IMG_IR_CODETYPE_PULSELEN,
132	},
133	/* main timings */
134	.unit = 600000, /* 600 us */
135	.timings = {
136		/* leader symbol */
137		.ldr = {
138			.pulse = { 4	/* 2.4 ms */ },
139			.space = { 1	/* 600 us */ },
140		},
141		/* 0 symbol */
142		.s00 = {
143			.pulse = { 1	/* 600 us */ },
144			.space = { 1	/* 600 us */ },
145		},
146		/* 1 symbol */
147		.s01 = {
148			.pulse = { 2	/* 1.2 ms */ },
149			.space = { 1	/* 600 us */ },
150		},
151		/* free time */
152		.ft = {
153			.minlen = 12,
154			.maxlen = 20,
155			.ft_min = 10,	/* 6 ms */
156		},
157	},
158	/* scancode logic */
159	.scancode = img_ir_sony_scancode,
160	.filter = img_ir_sony_filter,
161};