power: supply: core: Add additional health status values

Some batteries can signal when an internal fuse was blown. In such a
case POWER_SUPPLY_HEALTH_DEAD is too vague for userspace applications
to perform meaningful diagnostics.

Additionally some batteries can also signal when some of their
internal cells are imbalanced. In such a case returning
POWER_SUPPLY_HEALTH_UNSPEC_FAILURE is again too vague for userspace
applications to perform meaningful diagnostics.

Add new health status values for both cases.

Signed-off-by: Armin Wolf <W_Armin@gmx.de>
Reviewed-by: Sebastian Reichel <sebastian.reichel@collabora.com>
Link: https://lore.kernel.org/r/20250429003606.303870-1-W_Armin@gmx.de
Reviewed-by: Ilpo Järvinen <ilpo.jarvinen@linux.intel.com>
Signed-off-by: Ilpo Järvinen <ilpo.jarvinen@linux.intel.com>

Documentation/ABI/testing/sysfs-class-power

@@ -456,7 +456,7 @@ Description:
 			      "Over voltage", "Under voltage", "Unspecified failure", "Cold",
 			      "Watchdog timer expire", "Safety timer expire",
 			      "Over current", "Calibration required", "Warm",
-			      "Cool", "Hot", "No battery"
+			      "Cool", "Hot", "No battery", "Blown fuse", "Cell imbalance"
 
 What:		/sys/class/power_supply/<supply_name>/precharge_current
 Date:		June 2017

drivers/power/supply/power_supply_sysfs.c

@@ -110,6 +110,8 @@ static const char * const POWER_SUPPLY_HEALTH_TEXT[] = {
 	[POWER_SUPPLY_HEALTH_COOL]		    = "Cool",
 	[POWER_SUPPLY_HEALTH_HOT]		    = "Hot",
 	[POWER_SUPPLY_HEALTH_NO_BATTERY]	    = "No battery",
+	[POWER_SUPPLY_HEALTH_BLOWN_FUSE]	    = "Blown fuse",
+	[POWER_SUPPLY_HEALTH_CELL_IMBALANCE]	    = "Cell imbalance",
 };
 
 static const char * const POWER_SUPPLY_TECHNOLOGY_TEXT[] = {

include/linux/power_supply.h

@@ -71,6 +71,8 @@ enum {
 	POWER_SUPPLY_HEALTH_COOL,
 	POWER_SUPPLY_HEALTH_HOT,
 	POWER_SUPPLY_HEALTH_NO_BATTERY,
+	POWER_SUPPLY_HEALTH_BLOWN_FUSE,
+	POWER_SUPPLY_HEALTH_CELL_IMBALANCE,
 };
 
 enum {