feat: charger: add operation to get out voltage

Signed-off-by: zhangguoliang <zhangguoliang3@xiaomi.com>

drivers/power/battery_charger.c

@@ -370,6 +370,16 @@ static int bat_charger_ioctl(FAR struct file *filep, int cmd,
         }
         break;
 
+      case BATIOC_GET_VOLTAGE:
+        {
+          FAR int *outvoltsp = (FAR int *)((uintptr_t)arg);
+          if (outvoltsp)
+            {
+              ret = dev->ops->get_voltage(dev, outvoltsp);
+            }
+        }
+        break;
+
       default:
         _err("ERROR: Unrecognized cmd: %d\n", cmd);
         ret = -ENOTTY;

include/nuttx/power/battery_charger.h

@@ -122,6 +122,10 @@ struct battery_charger_operations_s
   /* Get chip id */
 
   int (*chipid)(struct battery_charger_dev_s *dev, unsigned int *value);
+
+  /* Get the actual output voltage for charging */
+
+  int (*get_voltage)(struct battery_charger_dev_s *dev, int *value);
 };
 
 /* This structure defines the battery driver state structure */

include/nuttx/power/battery_ioctl.h

@@ -55,6 +55,7 @@
 #define BATIOC_CLEARFAULTS   _BATIOC(0x000F)
 #define BATIOC_COULOMBS      _BATIOC(0x0010)
 #define BATIOC_CHIPID        _BATIOC(0x0011)
+#define BATIOC_GET_VOLTAGE   _BATIOC(0x0012)
 
 /* Special input values for BATIOC_INPUT_CURRENT that may optionally
  * be supported by lower-half driver: