Add DrmAmdCard config option

Some AMD cards are under card1, so make the hardcoded path at least a
bit configurable.

data/config

@@ -124,6 +124,10 @@ NetworkAdapter: eno1
 # Disables the network widget when set to false
 NetworkWidget: true
 
+# The card to poll when using AMDGPU. If you don't have an AMD card, you can skip this config.
+# Possible values can be found by querying /sys/class/drm
+DrmAmdCard: card0
+
 # Use tooltips instead of sliders for the sensors
 SensorTooltips: false
 

src/AMDGPU.h

@@ -6,16 +6,17 @@
 #ifdef WITH_AMD
 namespace AMDGPU
 {
-    static const char* utilizationFile = "/sys/class/drm/card0/device/gpu_busy_percent";
-    static const char* vramTotalFile = "/sys/class/drm/card0/device/mem_info_vram_total";
-    static const char* vramUsedFile = "/sys/class/drm/card0/device/mem_info_vram_used";
+    static const char* drmCardPrefix = "/sys/class/drm/";
+    static const char* utilizationFile = "/device/gpu_busy_percent";
+    static const char* vramTotalFile = "/device/mem_info_vram_total";
+    static const char* vramUsedFile = "/device/mem_info_vram_used";
     // TODO: Make this configurable
     static const char* tempFile = "/sys/class/drm/card0/device/hwmon/hwmon1/temp1_input";
 
     inline void Init()
     {
         // Test for drm device files
-        std::ifstream test(utilizationFile);
+        std::ifstream test(drmCardPrefix + Config::Get().drmAmdCard + utilizationFile);
         if (!test.is_open())
         {
             LOG("AMD GPU not found, disabling AMD GPU");
@@ -31,7 +32,7 @@ namespace AMDGPU
             return {};
         }
 
-        std::ifstream file(utilizationFile);
+        std::ifstream file(drmCardPrefix + Config::Get().drmAmdCard + utilizationFile);
         std::string line;
         std::getline(file, line);
         return atoi(line.c_str());
@@ -45,7 +46,7 @@ namespace AMDGPU
             return {};
         }
 
-        std::ifstream file(tempFile);
+        std::ifstream file(drmCardPrefix + Config::Get().drmAmdCard + tempFile);
         std::string line;
         std::getline(file, line);
         return atoi(line.c_str()) / 1000;
@@ -66,12 +67,12 @@ namespace AMDGPU
         }
         VRAM mem{};
 
-        std::ifstream file(vramTotalFile);
+        std::ifstream file(drmCardPrefix + Config::Get().drmAmdCard + vramTotalFile);
         std::string line;
         std::getline(file, line);
         mem.totalB = atoi(line.c_str());
 
-        file = std::ifstream(vramUsedFile);
+        file = std::ifstream(drmCardPrefix + Config::Get().drmAmdCard + vramUsedFile);
         std::getline(file, line);
         mem.usedB = atoi(line.c_str());
 

src/Config.cpp

@@ -232,6 +232,7 @@ void Config::Load()
 
         AddConfigVar("CPUThermalZone", config.cpuThermalZone, lineView, foundProperty);
         AddConfigVar("NetworkAdapter", config.networkAdapter, lineView, foundProperty);
+        AddConfigVar("DrmAmdCard", config.drmAmdCard, lineView, foundProperty);
         AddConfigVar("SuspendCommand", config.suspendCommand, lineView, foundProperty);
         AddConfigVar("LockCommand", config.lockCommand, lineView, foundProperty);
         AddConfigVar("ExitCommand", config.exitCommand, lineView, foundProperty);

src/Config.h

@@ -14,6 +14,7 @@ public:
 
     std::string cpuThermalZone = "";     // idk, no standard way of doing this.
     std::string networkAdapter = "eno1"; // Is this standard?
+    std::string drmAmdCard = "card0";    // The card to poll in AMDGPU.
     std::string suspendCommand = "systemctl suspend";
     std::string lockCommand = "";   // idk, no standard way of doing this.
     std::string exitCommand = "";   // idk, no standard way of doing this.