Move thermald hardware calls into HW abstraction layer (#2630)

* abstracted away hardware calls

* oopsie

* remove bugs

* remove bugs #2

* fix unit test

* removed print

Co-authored-by: Comma Device <device@comma.ai>
old-commit-hash: e64484aecd

common/hardware_base.py

@@ -8,6 +8,14 @@ class HardwareBase:
       cmdline = f.read()
     return {kv[0]: kv[1] for kv in [s.split('=') for s in cmdline.split(' ')] if len(kv) == 2}
 
+  @staticmethod
+  def read_param_file(path, parser, default=0):
+    try:
+      with open(path) as f:
+        return parser(f.read())
+    except Exception:
+      return default
+
   @abstractmethod
   def get_sound_card_online(self):
     pass
@@ -39,3 +47,35 @@ class HardwareBase:
   @abstractmethod
   def get_network_strength(self, network_type):
     pass
+
+  @abstractmethod
+  def get_battery_capacity(self):
+    pass
+
+  @abstractmethod
+  def get_battery_status(self):
+    pass
+
+  @abstractmethod
+  def get_battery_current(self):
+    pass
+
+  @abstractmethod
+  def get_battery_voltage(self):
+    pass
+
+  @abstractmethod
+  def get_battery_charging(self):
+    pass
+
+  @abstractmethod
+  def set_battery_charging(self, on):
+    pass
+
+  @abstractmethod
+  def get_usb_present(self):
+    pass
+
+  @abstractmethod
+  def get_current_power_draw(self):
+    pass