powermgmt: Small cleanups to battery capacity code

- Don't include the 'battery capacity' setting unless the
  target allows changing it.
- Clean up the preprocessor conditionals used to check for
  variable battery capacity support.
- Don't use a variable for battery capacity unless it is
  actually needed.

Change-Id: I3d8a338f107014f2c5098bc0a44ef0cfb4df9356

3 files changed, 16 insertions, 2 deletions

diff --git a/firmware/export/config.h b/firmware/export/config.h
index bb3f405d6a..277a1d8632 100644
--- a/firmware/export/config.h
+++ b/firmware/export/config.h
@@ -709,6 +709,14 @@ Lyre prototype 1 */
 #define BATTERY_CAPACITY_DEFAULT 0
 #endif
 
+#ifndef BATTERY_CAPACITY_MIN
+#define BATTERY_CAPACITY_MIN BATTERY_CAPACITY_DEFAULT
+#endif
+
+#ifndef BATTERY_CAPACITY_MAX
+#define BATTERY_CAPACITY_MAX BATTERY_CAPACITY_DEFAULT
+#endif
+
 #ifndef BATTERY_CAPACITY_INC
 #define BATTERY_CAPACITY_INC 0
 #endif
diff --git a/firmware/export/powermgmt.h b/firmware/export/powermgmt.h
index f45690573a..329e64d653 100644
--- a/firmware/export/powermgmt.h
+++ b/firmware/export/powermgmt.h
@@ -157,8 +157,10 @@ void battery_read_info(int *voltage, int *level);
 bool battery_level_safe(void);
 
 void set_poweroff_timeout(int timeout);
+#if BATTERY_CAPACITY_INC > 0
 void set_battery_capacity(int capacity); /* set local battery capacity value */
-int  get_battery_capacity(void); /* get local battery capacity value */
+#endif
+int get_battery_capacity(void); /* get local battery capacity value */
 void set_battery_type(int type); /* set local battery type */
 
 void set_sleeptimer_duration(int minutes);
diff --git a/firmware/powermgmt.c b/firmware/powermgmt.c
index 8c807e5382..8e47b19721 100644
--- a/firmware/powermgmt.c
+++ b/firmware/powermgmt.c
@@ -114,7 +114,11 @@ int _battery_time(void) { return powermgmt_est_runningtime_min; }
 #endif
 
 /* default value, mAh */
+#if BATTERY_CAPACITY_INC > 0
 static int battery_capacity = BATTERY_CAPACITY_DEFAULT;
+#else
+# define battery_capacity BATTERY_CAPACITY_DEFAULT
+#endif
 
 #if BATTERY_TYPES_COUNT > 1
 static int battery_type = 0;
@@ -170,7 +174,7 @@ void set_battery_type(int type)
 }
 #endif
 
-#ifdef BATTERY_CAPACITY_MIN
+#if BATTERY_CAPACITY_INC > 0
 void set_battery_capacity(int capacity)
 {
     if (capacity > BATTERY_CAPACITY_MAX)