Add option to disable fan control (#25690)

add option for external fan control

Co-authored-by: Comma Device <device@comma.ai>
old-commit-hash: 13d9a77b93

selfdrive/boardd/boardd.cc

@@ -468,7 +468,7 @@ void panda_state_thread(PubMaster *pm, std::vector<Panda *> pandas, bool spoofin
 }
 
 
-void peripheral_control_thread(Panda *panda) {
+void peripheral_control_thread(Panda *panda, bool no_fan_control) {
   util::set_thread_name("boardd_peripheral_control");
 
   SubMaster sm({"deviceState", "driverCameraState"});
@@ -488,7 +488,7 @@ void peripheral_control_thread(Panda *panda) {
     // Other pandas don't have fan/IR to control
     if (panda->hw_type != cereal::PandaState::PandaType::UNO && panda->hw_type != cereal::PandaState::PandaType::DOS) continue;
 
-    if (sm.updated("deviceState")) {
+    if (sm.updated("deviceState") && !no_fan_control) {
       // Fan speed
       uint16_t fan_speed = sm["deviceState"].getDeviceState().getFanSpeedPercentDesired();
       if (fan_speed != prev_fan_speed || cnt % 100 == 0) {
@@ -496,6 +496,7 @@ void peripheral_control_thread(Panda *panda) {
         prev_fan_speed = fan_speed;
       }
     }
+
     if (sm.updated("driverCameraState")) {
       auto event = sm["driverCameraState"];
       int cur_integ_lines = event.getDriverCameraState().getIntegLines();
@@ -568,7 +569,7 @@ void boardd_main_thread(std::vector<std::string> serials) {
     std::vector<std::thread> threads;
 
     threads.emplace_back(panda_state_thread, &pm, pandas, getenv("STARTED") != nullptr);
-    threads.emplace_back(peripheral_control_thread, peripheral_panda);
+    threads.emplace_back(peripheral_control_thread, peripheral_panda, getenv("NO_FAN_CONTROL") != nullptr);
 
     threads.emplace_back(can_send_thread, pandas, getenv("FAKESEND") != nullptr);
     threads.emplace_back(can_recv_thread, pandas);