Add ChangeHost hidpp20 feature

src/logid/CMakeLists.txt

@@ -55,6 +55,7 @@ add_executable(logid
         backend/hidpp20/features/SmartShift.cpp
         backend/hidpp20/features/ReprogControls.cpp
         backend/hidpp20/features/HiresScroll.cpp
+        backend/hidpp20/features/ChangeHost.cpp
         backend/dj/Report.cpp
         util/mutex_queue.h
         util/workqueue.cpp

src/logid/backend/hidpp/Device.cpp

@@ -189,6 +189,22 @@ Report Device::sendReport(Report& report)
     return response;
 }
 
+void Device::sendReportNoResponse(Report &report)
+{
+    switch(report.type())
+    {
+    case Report::Type::Short:
+        if(!(_supported_reports & HIDPP_REPORT_SHORT_SUPPORTED))
+            report.setType(Report::Type::Long);
+        break;
+    case Report::Type::Long:
+        /* Report can be truncated, but that isn't a good idea. */
+        assert(_supported_reports & HIDPP_REPORT_LONG_SUPPORTED);
+    }
+
+    _raw_device->sendReportNoResponse(report.rawReport());
+}
+
 std::string Device::name() const
 {
     return _name;

src/logid/backend/hidpp/Device.h

@@ -85,6 +85,7 @@ namespace hidpp
             eventHandlers();
 
         Report sendReport(Report& report);
+        void sendReportNoResponse(Report& report);
 
         void handleEvent(Report& report);
     private:

src/logid/backend/hidpp20/Device.cpp

@@ -55,3 +55,23 @@ std::vector<uint8_t> Device::callFunction(uint8_t feature_index,
     auto response = this->sendReport(request);
     return std::vector<uint8_t>(response.paramBegin(), response.paramEnd());
 }
+
+void Device::callFunctionNoResponse(uint8_t feature_index, uint8_t function,
+        std::vector<uint8_t> &params)
+{
+    hidpp::Report::Type type;
+
+    assert(params.size() <= hidpp::LongParamLength);
+    if(params.size() <= hidpp::ShortParamLength)
+        type = hidpp::Report::Type::Short;
+    else if(params.size() <= hidpp::LongParamLength)
+        type = hidpp::Report::Type::Long;
+    else
+        throw hidpp::Report::InvalidReportID();
+
+    hidpp::Report request(type, deviceIndex(), feature_index, function,
+                          LOGID_HIDPP_SOFTWARE_ID);
+    std::copy(params.begin(), params.end(), request.paramBegin());
+
+    this->sendReportNoResponse(request);
+}

src/logid/backend/hidpp20/Device.h

@@ -34,6 +34,10 @@ namespace hidpp20 {
         std::vector<uint8_t> callFunction(uint8_t feature_index,
                 uint8_t function,
                 std::vector<uint8_t>& params);
+
+        void callFunctionNoResponse(uint8_t feature_index,
+                uint8_t function,
+                std::vector<uint8_t>& params);
     };
 }}}
 

src/logid/backend/hidpp20/Feature.cpp

@@ -33,11 +33,18 @@ uint16_t UnsupportedFeature::code() const noexcept
     return _f_id;
 }
 
-std::vector<uint8_t> Feature::callFunction(uint8_t function_id, std::vector<uint8_t>& params)
+std::vector<uint8_t> Feature::callFunction(uint8_t function_id,
+        std::vector<uint8_t>& params)
 {
     return _device->callFunction(_index, function_id, params);
 }
 
+void Feature::callFunctionNoResponse(uint8_t function_id,
+        std::vector<uint8_t>& params)
+{
+    _device->callFunctionNoResponse(_index, function_id, params);
+}
+
 Feature::Feature(Device* dev, uint16_t _id) : _device (dev)
 {
     _index = hidpp20::FeatureID::ROOT;

src/logid/backend/hidpp20/Feature.h

@@ -45,6 +45,8 @@ namespace hidpp20 {
         explicit Feature(Device* dev, uint16_t _id);
         std::vector<uint8_t> callFunction(uint8_t function_id,
             std::vector<uint8_t>& params);
+        void callFunctionNoResponse(uint8_t function_id,
+            std::vector<uint8_t>& params);
     private:
         Device* _device;
         uint8_t _index;

src/logid/backend/hidpp20/features/ChangeHost.cpp

@@ -0,0 +1,78 @@
+/*
+ * Copyright 2019-2020 PixlOne
+ *
+ * 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 3 of the License, or
+ * (at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ * GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with this program.  If not, see <http://www.gnu.org/licenses/>.
+ *
+ */
+#include "ChangeHost.h"
+#include "../Error.h"
+
+using namespace logid::backend::hidpp20;
+
+ChangeHost::ChangeHost(Device *dev) : Feature(dev, ID), _host_count (0)
+{
+}
+
+ChangeHost::HostInfo ChangeHost::getHostInfo()
+{
+    std::vector<uint8_t> params(0);
+    auto response = callFunction(GetHostInfo, params);
+
+    HostInfo info{};
+    info.hostCount = response[0];
+    info.currentHost = response[1];
+    info.enhancedHostSwitch = response[2] & 1;
+
+    if(!_host_count)
+        _host_count = info.hostCount;
+
+    return info;
+}
+
+void ChangeHost::setHost(uint8_t host)
+{
+    /* Expect connection to be severed here, send without response
+     *
+     * Since there is no response, we have to emulate any kind of
+     * error that may be returned (i.e. InvalidArgument as per the docs)
+     */
+    if(!_host_count)
+        getHostInfo();
+
+    if(host >= _host_count)
+        throw hidpp20::Error(hidpp20::Error::InvalidArgument);
+
+    std::vector<uint8_t> params = {host};
+
+    callFunctionNoResponse(SetCurrentHost, params);
+}
+
+std::vector<uint8_t> ChangeHost::getCookies()
+{
+    if(!_host_count)
+        getHostInfo();
+
+    std::vector<uint8_t> params(0);
+    auto response = callFunction(GetCookies, params);
+
+    response.resize(_host_count);
+
+    return response;
+}
+
+void ChangeHost::setCookie(uint8_t host, uint8_t cookie)
+{
+    std::vector<uint8_t> params = {host, cookie};
+    callFunction(SetCookie, params);
+}

src/logid/backend/hidpp20/features/ChangeHost.h

@@ -0,0 +1,61 @@
+/*
+ * Copyright 2019-2020 PixlOne
+ *
+ * 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 3 of the License, or
+ * (at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ * GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with this program.  If not, see <http://www.gnu.org/licenses/>.
+ *
+ */
+#ifndef LOGID_BACKEND_HIDPP20_FEATURE_CHANGEHOST_H
+#define LOGID_BACKEND_HIDPP20_FEATURE_CHANGEHOST_H
+
+#include "../feature_defs.h"
+#include "../Feature.h"
+
+namespace logid {
+namespace backend {
+namespace hidpp20
+{
+    class ChangeHost : public Feature
+    {
+    public:
+        static const uint16_t ID = FeatureID::CHANGE_HOST;
+        virtual uint16_t getID() { return ID; }
+
+        ChangeHost(Device* dev);
+
+        enum Function {
+            GetHostInfo = 0,
+            SetCurrentHost = 1,
+            GetCookies = 2,
+            SetCookie = 3
+        };
+
+        struct HostInfo
+        {
+            uint8_t hostCount;
+            uint8_t currentHost;
+            bool enhancedHostSwitch;
+        };
+
+        HostInfo getHostInfo();
+        void setHost(uint8_t host);
+
+        std::vector<uint8_t> getCookies();
+        void setCookie(uint8_t host, uint8_t cookie);
+    private:
+        uint8_t _host_count;
+    };
+}}}
+
+
+#endif //LOGID_BACKEND_HIDPP20_FEATURE_CHANGEHOST_H