wifi: rtl8xxxu: Add LED control code for RTL8723BU

Software control (on/off) and hardware control (automatic blinking)
tested with EDUP EP-N8568.
Signed-off-by: Bitterblue Smith <rtl8821cerfe2@gmail.com>
Signed-off-by: Ping-Ke Shih <pkshih@realtek.com>
Link: https://msgid.link/7df66d1f-87a1-4f44-9aac-ce75438abde3@gmail.com

drivers/net/wireless/realtek/rtl8xxxu/rtl8xxxu_8723b.c

@@ -1701,6 +1701,28 @@ static s8 rtl8723b_cck_rssi(struct rtl8xxxu_priv *priv, struct rtl8723au_phy_sta
 	return rx_pwr_all;
 }
 
+static int rtl8723bu_led_brightness_set(struct led_classdev *led_cdev,
+					enum led_brightness brightness)
+{
+	struct rtl8xxxu_priv *priv = container_of(led_cdev,
+						  struct rtl8xxxu_priv,
+						  led_cdev);
+	u8 ledcfg = rtl8xxxu_read8(priv, REG_LEDCFG2);
+
+	ledcfg &= LEDCFG2_DPDT_SELECT;
+
+	if (brightness == LED_OFF)
+		ledcfg |= LEDCFG2_SW_LED_CONTROL | LEDCFG2_SW_LED_DISABLE;
+	else if (brightness == LED_ON)
+		ledcfg |= LEDCFG2_SW_LED_CONTROL;
+	else if (brightness == RTL8XXXU_HW_LED_CONTROL)
+		ledcfg |= LEDCFG2_HW_LED_CONTROL | LEDCFG2_HW_LED_ENABLE;
+
+	rtl8xxxu_write8(priv, REG_LEDCFG2, ledcfg);
+
+	return 0;
+}
+
 struct rtl8xxxu_fileops rtl8723bu_fops = {
 	.identify_chip = rtl8723bu_identify_chip,
 	.parse_efuse = rtl8723bu_parse_efuse,
@@ -1731,6 +1753,7 @@ struct rtl8xxxu_fileops rtl8723bu_fops = {
 	.fill_txdesc = rtl8xxxu_fill_txdesc_v2,
 	.set_crystal_cap = rtl8723a_set_crystal_cap,
 	.cck_rssi = rtl8723b_cck_rssi,
+	.led_classdev_brightness_set = rtl8723bu_led_brightness_set,
 	.writeN_block_size = 1024,
 	.tx_desc_size = sizeof(struct rtl8xxxu_txdesc40),
 	.rx_desc_size = sizeof(struct rtl8xxxu_rxdesc24),