tree: add routine to fetch subsys firmware rev

Add a new routine to fetch the subsystem firmware
revision.

Signed-off-by: Martin George <[email protected]>

Author: martin-gpy

src/libnvme.map

@@ -9,6 +9,7 @@ LIBNVME_1.12 {
 		nvme_lm_get_features_ctrl_data_queue;
 		nvmf_exat_ptr_next;
 		nvme_subsystem_get_model;
+		nvme_subsystem_get_fw_rev;
 };
 
 LIBNVME_1.11 {

src/nvme/tree.c

@@ -532,6 +532,11 @@ const char *nvme_subsystem_get_model(nvme_subsystem_t s)
 	return s->model;
 }
 
+const char *nvme_subsystem_get_fw_rev(nvme_subsystem_t s)
+{
+	return s->firmware;
+}
+
 nvme_ctrl_t nvme_subsystem_first_ctrl(nvme_subsystem_t s)
 {
 	return list_top(&s->ctrls, struct nvme_ctrl, entry);

src/nvme/tree.h

@@ -1354,6 +1354,14 @@ const char *nvme_subsystem_get_iopolicy(nvme_subsystem_t s);
  */
 const char *nvme_subsystem_get_model(nvme_subsystem_t s);
 
+/**
+ * nvme_subsystem_get_fw_rev() - Return the firmware rev of subsystem
+ * @s:	nvme_subsystem_t object
+ *
+ * Return: Firmware revision of the current subsystem
+ */
+const char *nvme_subsystem_get_fw_rev(nvme_subsystem_t s);
+
 /**
  * nvme_scan_topology() - Scan NVMe topology and apply filter
  * @r:	    nvme_root_t object