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/*
* Copyright (C) 2017 The Android Open Source Project
*
* Licensed under the Apache License, Version 2.0 (the "License");
* you may not use this file except in compliance with the License.
* You may obtain a copy of the License at
*
* http://www.apache.org/licenses/LICENSE-2.0
*
* Unless required by applicable law or agreed to in writing, software
* distributed under the License is distributed on an "AS IS" BASIS,
* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
* See the License for the specific language governing permissions and
* limitations under the License.
*/
#include "HidReport.h"
#include "HidDefs.h"
#include <cmath>
#include <sstream>
#include <iomanip>
namespace HidUtil {
HidReport::HidReport(uint32_t type, uint32_t data,
const HidGlobal &global, const HidLocal &local)
: mReportType(type),
mFlag(data),
mUsagePage(global.usagePage.get(0)), // default value 0
mUsage(local.getUsage(0)),
mUsageVector(local.usage),
mLogicalMin(global.logicalMin.get(0)), // default value 0
mLogicalMax(global.logicalMax.get(0)),
mReportSize(global.reportSize),
mReportCount(global.reportCount),
mPhysicalMin(global.physicalMin),
mPhysicalMax(global.physicalMax),
mExponent(global.exponent),
mUnit(global.unit),
mReportId(global.reportId) { }
std::string HidReport::getStringType() const {
return reportTypeToString(mReportType);
}
std::string HidReport::reportTypeToString(int type) {
using namespace HidDef::MainTag;
switch(type) {
case INPUT:
return "INPUT";
case OUTPUT:
return "OUTPUT";
case FEATURE:
return "FEATURE";
default:
return "<<UNKNOWN>>";
}
}
double HidReport::getExponentValue() const {
if (!mExponent.isSet()) {
return 1;
}
// default exponent is 0
int exponentInt = mExponent.get(0);
if (exponentInt > 15 || exponentInt < 0) {
return NAN;
}
return pow(10.0, static_cast<double>((exponentInt <= 7) ? exponentInt : exponentInt - 16));
}
std::string HidReport::getExponentString() const {
int exponentInt = mExponent.get(0);
if (exponentInt > 15 || exponentInt < 0) {
return "[error]";
}
return std::string("x10^")
+ std::to_string((exponentInt <= 7) ? exponentInt : exponentInt - 16);
}
std::string HidReport::getUnitString() const {
if (!mUnit.isSet()) {
return "default";
}
return "[not implemented]";
std::ostringstream ret;
ret << std::hex << std::setfill('0') << std::setw(2) << mUnit.get(0);
return ret.str();
}
std::string HidReport::getFlagString() const {
using namespace HidDef::ReportFlag;
std::string ret;
ret += (mFlag & DATA_CONST) ? "Const " : "Data ";
ret += (mFlag & ARRAY_VARIABLE) ? "Variable " : "Array ";
ret += (mFlag & WRAP) ? "Wrap " : "";
ret += (mFlag & NONLINEAR) ? "Nonlinear " : "";
ret += (mFlag & NO_PREFERRED) ? "NoPreferred " : "";
ret += (mFlag & NULL_STATE) ? "NullState " : "";
ret += (mFlag & VOLATILE) ? "Volatile " : "";
ret += (mFlag & BUFFERED_BYTES) ? "BufferedBytes " : "";
return ret;
}
// isArray() will return true for reports that may contains multiple values, e.g. keyboard scan
// code, which can have multiple value, each denoting a key pressed down at the same time. It will
// return false if repor represent a vector or matrix.
//
// This slightly deviates from HID's definition, it is more convenient this way as matrix/vector
// input is treated similarly as variables.
bool HidReport::isArray() const {
using namespace HidDef::ReportFlag;
return (mFlag & ARRAY_VARIABLE) == 0 && mIsCollapsed;
}
bool HidReport::isVariable() const {
return !isArray();
}
bool HidReport::isData() const {
using namespace HidDef::ReportFlag;
return (mFlag & DATA_CONST) == 0;
}
std::ostream& operator<<(std::ostream& os, const HidReport& h) {
os << h.getStringType() << ", "
<< "usage: " << std::hex << h.getFullUsage() << std::dec << ", ";
if (h.isData()) {
auto range = h.getLogicalRange();
os << "logMin: " << range.first << ", "
<< "logMax: " << range.second << ", ";
if (range == h.getPhysicalRange()) {
os << "phy===log, ";
} else {
range = h.getPhysicalRange();
os << "phyMin: " << range.first << ", "
<< "phyMax: " << range.second << ", ";
}
if (h.isArray()) {
os << "map: (" << std::hex;
for (auto i : h.getUsageVector()) {
os << i << ",";
}
os << "), " << std::dec;
}
os << "exponent: " << h.getExponentString() << ", "
<< "unit: " << h.getUnitString() << ", ";
} else {
os << "constant: ";
}
os << "size: " << h.getSize() << "bit x " << h.getCount() << ", "
<< "id: " << h.mReportId;
return os;
}
std::pair<int64_t, int64_t> HidReport::getLogicalRange() const {
int64_t a = mLogicalMin;
int64_t b = mLogicalMax;
if (a > b) {
// might be unsigned
a = a & ((static_cast<int64_t>(1) << getSize()) - 1);
b = b & ((static_cast<int64_t>(1) << getSize()) - 1);
if (a > b) {
// bad hid descriptor
return {0, 0};
}
}
return {a, b};
}
std::pair<int64_t, int64_t> HidReport::getPhysicalRange() const {
if (!(mPhysicalMin.isSet() && mPhysicalMax.isSet())) {
// physical range undefined, use logical range
return getLogicalRange();
}
int64_t a = mPhysicalMin.get(0);
int64_t b = mPhysicalMax.get(0);
if (a > b) {
a = a & ((static_cast<int64_t>(1) << getSize()) - 1);
b = b & ((static_cast<int64_t>(1) << getSize()) - 1);
if (a > b) {
return {0, 0};
}
}
return {a, b};
}
unsigned int HidReport::getFullUsage() const {
return mUsage | (mUsagePage << 16);
}
size_t HidReport::getSize() const {
return mReportSize;
}
size_t HidReport::getCount() const {
return mReportCount;
}
unsigned int HidReport::getUnit() const {
return mUnit.get(0); // default unit is 0 means default unit
}
unsigned HidReport::getReportId() const {
// if report id is not specified, it defaults to zero
return mReportId.get(0);
}
unsigned HidReport::getType() const {
return mReportType;
}
void HidReport::setCollapsed(uint32_t fullUsage) {
mUsage = fullUsage & 0xFFFF;
mUsagePage = fullUsage >> 16;
mIsCollapsed = true;
}
const std::vector<unsigned int>& HidReport::getUsageVector() const {
return mUsageVector;
}
} // namespace HidUtil
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