define callback APIs for auxiliary firmware update.

TEST="COV=1 make" passes
	depthcharge still compiles
	in combination with follow-up CLs, ps8751 firmware update
	succeeds.

BUG=b:35586896

Change-Id: Ibadc41e56e4e25ee0aba5c83caa0e3596fb9ad20
Reviewed-on: https://chromium-review.googlesource.com/505259
Commit-Ready: Caveh Jalali <caveh@google.com>
Tested-by: Caveh Jalali <caveh@google.com>
Reviewed-by: Randall Spangler <rspangler@chromium.org>

firmware/include/vboot_api.h

@@ -998,6 +998,44 @@ VbError_t VbExEcVbootDone(int in_recovery);
  */
 VbError_t VbExEcBatteryCutOff(void);
 
+/*
+ * severity levels for an auxiliary firmware update request
+ */
+typedef enum {
+	/* no update needed */
+	VB_AUX_FW_NO_UPDATE = 0,
+	/* update needed, can be done quickly */
+	VB_AUX_FW_FAST_UPDATE = 1,
+	/* update needed, "this would take a while..." */
+	VB_AUX_FW_SLOW_UPDATE = 2,
+} VbAuxFwUpdateSeverity_t;
+
+/**
+ * Perform auxiliary firmware checks.
+ *
+ * This is called after the EC has been updated and is intended to
+ * version-check additional firmware blobs such as TCPCs.
+ *
+ * @param severity	return parameter for health of auxiliary firmware
+ *			0: no update needed
+ *			1: fast update needed
+ *			2: slow update needed
+ * @return VBERROR_... error, VBERROR_SUCCESS on success.
+ */
+
+VbError_t VbExCheckAuxFw(VbAuxFwUpdateSeverity_t *severity);
+
+/**
+ * Perform auxiliary firmware update(s).
+ *
+ * This is called after the EC has been updated and is intended to
+ * update additional firmware blobs such as TCPCs.
+ *
+ * @return VBERROR_... error, VBERROR_SUCCESS on success.
+ */
+
+VbError_t VbExUpdateAuxFw(void);
+
 /*****************************************************************************/
 /* Misc */
 

firmware/stub/vboot_api_stub.c

@@ -187,6 +187,17 @@ VbError_t VbExEcBatteryCutOff(void)
 	return VBERROR_SUCCESS;
 }
 
+VbError_t VbExCheckAuxFw(VbAuxFwUpdateSeverity_t *severity)
+{
+	*severity = VB_AUX_FW_NO_UPDATE;
+	return VBERROR_SUCCESS;
+}
+
+VbError_t VbExUpdateAuxFw(void)
+{
+	return VBERROR_SUCCESS;
+}
+
 enum VbEcBootMode_t VbGetMode(void)
 {
 	return vboot_mode;