hardware: add helper for setting IR power (#34245)

* hardware: add helper for setting IR power

* fix

selfdrive/pandad/pandad.cc

@@ -416,6 +416,7 @@ void process_peripheral_state(Panda *panda, PubMaster *pm, bool no_fan_control)
 
     if (ir_pwr != prev_ir_pwr || sm.frame % 100 == 0 || ir_pwr >= 50.0) {
       panda->set_ir_pwr(ir_pwr);
+      Hardware::set_ir_power(ir_pwr);
       prev_ir_pwr = ir_pwr;
     }
   }

system/hardware/base.h

@@ -28,6 +28,7 @@ class HardwareNone {
   static void reboot() {}
   static void poweroff() {}
   static void set_brightness(int percent) {}
+  static void set_ir_power(int percentage) {}
   static void set_display_power(bool on) {}
 
   static bool get_ssh_enabled() { return false; }

system/hardware/tici/hardware.h

@@ -4,6 +4,7 @@
 #include <fstream>
 #include <map>
 #include <string>
+#include <algorithm>  // for std::clamp
 
 #include "common/params.h"
 #include "common/util.h"
@@ -68,6 +69,28 @@ class HardwareTici : public HardwareNone {
     }
   }
 
+  static void set_ir_power(int percent) {
+    auto device = get_device_type();
+    if (device == cereal::InitData::DeviceType::TICI ||
+        device == cereal::InitData::DeviceType::TIZI) {
+      return;
+    }
+
+    percent = std::clamp(percent, 0, 100);
+
+    std::ofstream torch_brightness("/sys/class/leds/led:torch_2/brightness");
+    if (torch_brightness.is_open()) {
+      torch_brightness << percent << "\n";
+      torch_brightness.close();
+    }
+
+    std::ofstream switch_brightness("/sys/class/leds/led:switch_2/brightness");
+    if (switch_brightness.is_open()) {
+      switch_brightness << percent << "\n";
+      switch_brightness.close();
+    }
+  }
+
   static std::map<std::string, std::string> get_init_logs() {
     std::map<std::string, std::string> ret = {
       {"/BUILD", util::read_file("/BUILD")},