ANDROID: GKI: power: power_supply: Add property CHARGE_COUNTER_EXT and 64-bit precision properties

Add POWER_SUPPLY_PROP_CHARGE_COUNTER_EXT that stores accumulated charge
in nAh units as a signed 64-bit value.

Add generic support for signed 64-bit property values.

Signed-off-by: Todd Poynor <toddpoynor@google.com>
(cherry picked from commit 6a42773954)
Signed-off-by: Mark Salyzyn <salyzyn@google.com>
Bug: 150789066
Change-Id: I2bd34b1e95ffba24e7bfef81f398f22bd2aaf05e

drivers/power/supply/power_supply_sysfs.c

@@ -172,6 +172,9 @@ static ssize_t power_supply_show_property(struct device *dev,
 		ret = sprintf(buf, "%s\n",
 			      power_supply_scope_text[value.intval]);
 		break;
+	case POWER_SUPPLY_PROP_CHARGE_COUNTER_EXT:
+		ret = sprintf(buf, "%lld\n", value.int64val);
+		break;
 	case POWER_SUPPLY_PROP_MODEL_NAME ... POWER_SUPPLY_PROP_SERIAL_NUMBER:
 		ret = sprintf(buf, "%s\n", value.strval);
 		break;
@@ -307,6 +310,8 @@ static struct device_attribute power_supply_attrs[] = {
 	POWER_SUPPLY_ATTR(usb_hc),
 	POWER_SUPPLY_ATTR(usb_otg),
 	POWER_SUPPLY_ATTR(charge_enabled),
+	/* Local extensions of type int64_t */
+	POWER_SUPPLY_ATTR(charge_counter_ext),
 	/* Properties of type `const char *' */
 	POWER_SUPPLY_ATTR(model_name),
 	POWER_SUPPLY_ATTR(manufacturer),

include/linux/power_supply.h

@@ -18,6 +18,7 @@
 #include <linux/leds.h>
 #include <linux/spinlock.h>
 #include <linux/notifier.h>
+#include <linux/types.h>
 
 /*
  * All voltages, currents, charges, energies, time and temperatures in uV,
@@ -154,6 +155,8 @@ enum power_supply_property {
 	POWER_SUPPLY_PROP_USB_HC,
 	POWER_SUPPLY_PROP_USB_OTG,
 	POWER_SUPPLY_PROP_CHARGE_ENABLED,
+	/* Local extensions of type int64_t */
+	POWER_SUPPLY_PROP_CHARGE_COUNTER_EXT,
 	/* Properties of type `const char *' */
 	POWER_SUPPLY_PROP_MODEL_NAME,
 	POWER_SUPPLY_PROP_MANUFACTURER,
@@ -195,6 +198,7 @@ enum power_supply_notifier_events {
 union power_supply_propval {
 	int intval;
 	const char *strval;
+	int64_t int64val;
 };
 
 struct device_node;