cnss2: Add api to return the pci slot in use

Add api to return the pci slot in use. With the new targets,
QCA6490/kiwi devices are getting attached on pci slot 1
as well, so host driver call this exported api to get the pci
slot of device attached.

Change-Id: Ief51204258090df16b48267f3aeb851ded365525

cnss2/pci.c

@@ -1655,6 +1655,27 @@ void cnss_pci_unlock_reg_window(struct device *dev, unsigned long *flags)
 }
 EXPORT_SYMBOL(cnss_pci_unlock_reg_window);
 
+int cnss_get_pci_slot(struct device *dev)
+{
+	struct pci_dev *pci_dev = to_pci_dev(dev);
+	struct cnss_pci_data *pci_priv = cnss_get_pci_priv(pci_dev);
+	struct cnss_plat_data *plat_priv = NULL;
+
+	if (!pci_priv) {
+		cnss_pr_err("pci_priv is NULL\n");
+		return -EINVAL;
+	}
+
+	plat_priv = pci_priv->plat_priv;
+	if (!plat_priv) {
+		cnss_pr_err("plat_priv is NULL\n");
+		return -ENODEV;
+	}
+
+	return plat_priv->rc_num;
+}
+EXPORT_SYMBOL(cnss_get_pci_slot);
+
 /**
  * cnss_pci_dump_bl_sram_mem - Dump WLAN device bootloader debug log
  * @pci_priv: driver PCI bus context pointer

inc/cnss2.h

@@ -275,4 +275,5 @@ extern int cnss_get_mem_seg_count(enum cnss_remote_mem_type type, u32 *seg);
 extern int cnss_get_mem_segment_info(enum cnss_remote_mem_type type,
 				     struct cnss_mem_segment segment[],
 				     u32 segment_count);
+extern int cnss_get_pci_slot(struct device *dev);
 #endif /* _NET_CNSS2_H */