img-ir-sony.c
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/*
* ImgTec IR Decoder setup for Sony (SIRC) protocol.
*
* Copyright 2012-2014 Imagination Technologies Ltd.
*
* This program is free software; you can redistribute it and/or modify
* it under the terms of the GNU General Public License as published by the
* Free Software Foundation; either version 2 of the License, or (at your
* option) any later version.
*/
#include "img-ir-hw.h"
/* Convert Sony data to a scancode */
static int img_ir_sony_scancode(int len, u64 raw, u64 enabled_protocols,
struct img_ir_scancode_req *request)
{
unsigned int dev, subdev, func;
switch (len) {
case 12:
if (!(enabled_protocols & RC_BIT_SONY12))
return -EINVAL;
func = raw & 0x7f; /* first 7 bits */
raw >>= 7;
dev = raw & 0x1f; /* next 5 bits */
subdev = 0;
request->protocol = RC_TYPE_SONY12;
break;
case 15:
if (!(enabled_protocols & RC_BIT_SONY15))
return -EINVAL;
func = raw & 0x7f; /* first 7 bits */
raw >>= 7;
dev = raw & 0xff; /* next 8 bits */
subdev = 0;
request->protocol = RC_TYPE_SONY15;
break;
case 20:
if (!(enabled_protocols & RC_BIT_SONY20))
return -EINVAL;
func = raw & 0x7f; /* first 7 bits */
raw >>= 7;
dev = raw & 0x1f; /* next 5 bits */
raw >>= 5;
subdev = raw & 0xff; /* next 8 bits */
request->protocol = RC_TYPE_SONY20;
break;
default:
return -EINVAL;
}
request->scancode = dev << 16 | subdev << 8 | func;
return IMG_IR_SCANCODE;
}
/* Convert NEC scancode to NEC data filter */
static int img_ir_sony_filter(const struct rc_scancode_filter *in,
struct img_ir_filter *out, u64 protocols)
{
unsigned int dev, subdev, func;
unsigned int dev_m, subdev_m, func_m;
unsigned int len = 0;
dev = (in->data >> 16) & 0xff;
dev_m = (in->mask >> 16) & 0xff;
subdev = (in->data >> 8) & 0xff;
subdev_m = (in->mask >> 8) & 0xff;
func = (in->data >> 0) & 0x7f;
func_m = (in->mask >> 0) & 0x7f;
if (subdev & subdev_m) {
/* can't encode subdev and higher device bits */
if (dev & dev_m & 0xe0)
return -EINVAL;
/* subdevice (extended) bits only in 20 bit encoding */
if (!(protocols & RC_BIT_SONY20))
return -EINVAL;
len = 20;
dev_m &= 0x1f;
} else if (dev & dev_m & 0xe0) {
/* upper device bits only in 15 bit encoding */
if (!(protocols & RC_BIT_SONY15))
return -EINVAL;
len = 15;
subdev_m = 0;
} else {
/*
* The hardware mask cannot distinguish high device bits and low
* extended bits, so logically AND those bits of the masks
* together.
*/
subdev_m &= (dev_m >> 5) | 0xf8;
dev_m &= 0x1f;
}
/* ensure there aren't any bits straying between fields */
dev &= dev_m;
subdev &= subdev_m;
/* write the hardware filter */
out->data = func |
dev << 7 |
subdev << 15;
out->mask = func_m |
dev_m << 7 |
subdev_m << 15;
if (len) {
out->minlen = len;
out->maxlen = len;
}
return 0;
}
/*
* Sony SIRC decoder
* See also http://www.sbprojects.com/knowledge/ir/sirc.php
* http://picprojects.org.uk/projects/sirc/sonysirc.pdf
*/
struct img_ir_decoder img_ir_sony = {
.type = RC_BIT_SONY12 | RC_BIT_SONY15 | RC_BIT_SONY20,
.control = {
.decoden = 1,
.code_type = IMG_IR_CODETYPE_PULSELEN,
},
/* main timings */
.unit = 600000, /* 600 us */
.timings = {
/* leader symbol */
.ldr = {
.pulse = { 4 /* 2.4 ms */ },
.space = { 1 /* 600 us */ },
},
/* 0 symbol */
.s00 = {
.pulse = { 1 /* 600 us */ },
.space = { 1 /* 600 us */ },
},
/* 1 symbol */
.s01 = {
.pulse = { 2 /* 1.2 ms */ },
.space = { 1 /* 600 us */ },
},
/* free time */
.ft = {
.minlen = 12,
.maxlen = 20,
.ft_min = 10, /* 6 ms */
},
},
/* scancode logic */
.scancode = img_ir_sony_scancode,
.filter = img_ir_sony_filter,
};