wilc1000: use API version number info along with firmware filename

Added version number info along with firmware name so driver can pick
the correct revision of FW file. Moved FW filename macro as part of
driver code & added MODULE_FIRMWARE to specify FW needed by module.
Signed-off-by: Ajay Singh <ajay.kathat@microchip.com>
Signed-off-by: Kalle Valo <kvalo@codeaurora.org>
Link: https://lore.kernel.org/r/20200710051826.3267-6-ajay.kathat@microchip.com

drivers/net/wireless/microchip/wilc1000/Makefile

 # SPDX-License-Identifier: GPL-2.0
 obj-$(CONFIG_WILC1000) += wilc1000.o
 
-ccflags-y += -DFIRMWARE_WILC1000=\"atmel/wilc1000_wifi_firmware.bin\"
-
 wilc1000-objs := cfg80211.o netdev.o mon.o \
 			hif.o wlan_cfg.o wlan.o
 

drivers/net/wireless/microchip/wilc1000/netdev.c

@@ -15,6 +15,13 @@
 
 #define WILC_MULTICAST_TABLE_SIZE	8
 
+/* latest API version supported */
+#define WILC1000_API_VER		1
+
+#define WILC1000_FW_PREFIX		"atmel/wilc1000_wifi_firmware-"
+#define __WILC1000_FW(api)		WILC1000_FW_PREFIX #api ".bin"
+#define WILC1000_FW(api)		__WILC1000_FW(api)
+
 static irqreturn_t isr_uh_routine(int irq, void *user_data)
 {
 	struct net_device *dev = user_data;
@@ -177,15 +184,18 @@ static int wilc_wlan_get_firmware(struct net_device *dev)
 	struct wilc *wilc = vif->wilc;
 	int chip_id;
 	const struct firmware *wilc_fw;
+	int ret;
 
 	chip_id = wilc_get_chipid(wilc, false);
 
 	netdev_info(dev, "ChipID [%x] loading firmware [%s]\n", chip_id,
-		    FIRMWARE_WILC1000);
+		    WILC1000_FW(WILC1000_API_VER));
 
-	if (request_firmware(&wilc_fw, FIRMWARE_WILC1000, wilc->dev) != 0) {
+	ret = request_firmware(&wilc_fw, WILC1000_FW(WILC1000_API_VER),
+			       wilc->dev);
+	if (ret != 0) {
 		netdev_err(dev, "%s - firmware not available\n",
-			   FIRMWARE_WILC1000);
+			   WILC1000_FW(WILC1000_API_VER));
 		return -EINVAL;
 	}
 	wilc->firmware = wilc_fw;
@@ -925,3 +935,4 @@ struct wilc_vif *wilc_netdev_ifc_init(struct wilc *wl, const char *name,
 }
 
 MODULE_LICENSE("GPL");
+MODULE_FIRMWARE(WILC1000_FW(WILC1000_API_VER));