Log SOM power draw (#24975)

* log SOM power draw

* bump cereal

Co-authored-by: Comma Device <device@comma.ai>
Co-authored-by: Willem Melching <willem.melching@gmail.com>

system/hardware/base.py

@@ -86,6 +86,10 @@ class HardwareBase(ABC):
   def get_current_power_draw(self):
     pass
 
+  @abstractmethod
+  def get_som_power_draw(self):
+    pass
+
   @abstractmethod
   def shutdown(self):
     pass

system/hardware/pc/hardware.py

@@ -55,6 +55,9 @@ class Pc(HardwareBase):
 
   def get_current_power_draw(self):
     return 0
+  
+  def get_som_power_draw(self):
+    return 0
 
   def shutdown(self):
     print("SHUTDOWN!")

system/hardware/tici/hardware.py

@@ -362,6 +362,9 @@ class Tici(HardwareBase):
   def get_current_power_draw(self):
     return (self.read_param_file("/sys/class/hwmon/hwmon1/power1_input", int) / 1e6)
 
+  def get_som_power_draw(self):
+    return (self.read_param_file("/sys/class/power_supply/bms/voltage_now", int) * self.read_param_file("/sys/class/power_supply/bms/current_now", int) / 1e12)
+
   def shutdown(self):
     # Note that for this to work and have the device stay powered off, the panda needs to be in UsbPowerMode::CLIENT!
     os.system("sudo poweroff")