ec/google/chromeec: Add API to check if charger is present

This patch introduces a new API, `google_chromeec_is_charger_present()`,
to determine if a charger is connected.

The API leverages the existing `ec_cmd_battery_get_dynamic()` command
to retrieve battery flags and checks the `EC_BATT_FLAG_AC_PRESENT`
flag to ascertain charger presence.

Other components can leverage this API to query the charger status,
which is particularly useful for distinguishing between barrel chargers
and USB-C chargers after relying on the
`google_chromeec_is_usb_pd_attached()` API.

BUG=b:377798581
TEST=Able to read the charger status (w/ barrel and/or w/ USB-PD)
correctly while booting google/fatcat.

Change-Id: Iadf81400f71a51c093f71fe995cacc107c50c7af
Signed-off-by: Subrata Banik <subratabanik@google.com>
Reviewed-on: https://review.coreboot.org/c/coreboot/+/85758
Reviewed-by: Jérémy Compostella <jeremy.compostella@intel.com>
Reviewed-by: Kapil Porwal <kapilporwal@google.com>
Tested-by: build bot (Jenkins) <no-reply@coreboot.org>

src/ec/google/chromeec/ec.c

@@ -985,6 +985,23 @@ bool google_chromeec_is_usb_pd_attached(void)
 	return resp.type == USB_CHG_TYPE_PD;
 }
 
+/* This API checks if charger is present. */
+bool google_chromeec_is_charger_present(void)
+{
+	struct ec_params_battery_dynamic_info params = {
+		.index = 0,
+	};
+	struct ec_response_battery_dynamic_info resp;
+
+	if (ec_cmd_battery_get_dynamic(PLAT_EC, &params, &resp) == 0) {
+		/* Check if AC charger is present */
+		if (resp.flags & EC_BATT_FLAG_AC_PRESENT)
+			return true;
+	}
+
+	return false;
+}
+
 int google_chromeec_override_dedicated_charger_limit(uint16_t current_lim,
 						     uint16_t voltage_lim)
 {

src/ec/google/chromeec/ec.h

@@ -140,6 +140,14 @@ int google_chromeec_get_usb_pd_power_info(enum usb_chg_type *type,
 /* Check if a USB Power Delivery (PD) charger is attached */
 bool google_chromeec_is_usb_pd_attached(void);
 
+/**
+ * Check if charger is present.
+ *
+ * @return		true: if the charger is present
+ *			false: if the charger is not present
+ */
+bool google_chromeec_is_charger_present(void);
+
 /*
  * Set max current and voltage of a dedicated charger.
  *