From 701e70bd3edf2fef473dfe3f880000d4fb16b4c5 Mon Sep 17 00:00:00 2001
From: Kurt Himebauch <136133082+xXJSONDeruloXx@users.noreply.github.com>
Date: Thu, 22 Oct 2026 11:43:05 -0400
Subject: [PATCH] fix: the emulated Steam Controller reports the firmware build
 Steam ships (#1323)

* fix: the emulated Steam Controller reports the firmware build Steam ships

* fix Triton firmware lookup for Steam root binary
---
 app/src/main/cpp/fakeinput_steam.cpp | 34 +++++++++++++++++++++++++++-
 1 file changed, 33 insertions(+), 1 deletion(-)

diff --git a/app/src/main/cpp/fakeinput_steam.cpp b/app/src/main/cpp/fakeinput_steam.cpp
index 05d0138dd..c446170fe 100644
--- a/app/src/main/cpp/fakeinput_steam.cpp
+++ b/app/src/main/cpp/fakeinput_steam.cpp
@@ -2650,6 +2650,38 @@ __attribute__((visibility("hidden"))) static int triton_get_feature(DeckHidraw &
 static constexpr uint32_t TRITON_HWID = 72;
 static constexpr uint32_t TRITON_FW_TIMESTAMP = 0x6AC686B3;
 
+// Steam compares the controller's firmware with TRITON_FW_TS in its bundled hardwareupdater.cfg (and blocks
+// with a required update below MUST_UPDATE_TRITON_FW_TS), so the emulated pad reports at least the build
+// Steam ships.
+static uint32_t triton_fw_timestamp() {
+  static const uint32_t timestamp = [] {
+    std::vector<std::string> roots;
+    char exe[PATH_MAX];
+    ssize_t n = readlink("/proc/self/exe", exe, sizeof(exe) - 1);
+    if (n > 0) {
+      std::string path(exe, static_cast<size_t>(n));
+      size_t bin = path.rfind('/');
+      size_t root = bin == std::string::npos || bin == 0 ? std::string::npos : path.rfind('/', bin - 1);
+      if (bin != std::string::npos && bin > 0) roots.push_back(path.substr(0, bin));
+      if (root != std::string::npos) roots.push_back(path.substr(0, root));
+    }
+    if (const char *home = getenv("HOME")) roots.push_back(std::string(home) + "/.local/share/Steam");
+    uint32_t newest = TRITON_FW_TIMESTAMP;
+    for (const std::string &root : roots) {
+      std::ifstream cfg(root + "/bin/hardwareupdater/hardwareupdater.cfg");
+      std::string line;
+      while (std::getline(cfg, line)) {
+        if (line.rfind("TRITON_FW_TS:", 0) != 0) continue;
+        uint32_t shipped = static_cast<uint32_t>(strtoul(line.c_str() + 13, nullptr, 16));
+        if (shipped > newest) newest = shipped;
+      }
+    }
+    if (newest != TRITON_FW_TIMESTAMP) Logger::log("triton: reporting firmware %08x, the build Steam ships\n", newest);
+    return newest;
+  }();
+  return timestamp;
+}
+
 __attribute__((visibility("hidden"))) static int triton_pad_feature(DeckHidraw &triton, uint8_t *buf, size_t size, bool set) {
   if (!buf || size < 2) {
     errno = EINVAL;
@@ -2670,7 +2702,7 @@ __attribute__((visibility("hidden"))) static int triton_pad_feature(DeckHidraw &
   switch (triton.pending_feature) {
   case DECK_GET_ATTRIBUTES_VALUES: {
     static const uint8_t kIds[] = {0x01, 0x02, 0x04, 0x09, 0x0a, 0x0b};
-    const uint32_t values[] = {static_cast<uint32_t>(TRITON_WIRED_PRODUCT), 0, TRITON_FW_TIMESTAMP, TRITON_HWID, 0, 4000};
+    const uint32_t values[] = {static_cast<uint32_t>(TRITON_WIRED_PRODUCT), 0, triton_fw_timestamp(), TRITON_HWID, 0, 4000};
     reply[2] = sizeof(kIds) * 5;
     for (size_t i = 0; i < sizeof(kIds); i++) {
       reply[3 + i * 5] = kIds[i];