wifi: mt76: mt7921e: add LED control support

Introduce wifi LED switch control, add flow to Control a wifi
gpio pin based on the status of WIFI radio, if the pin is connected
to an LED, the LED will indicate the status of the WiFi radio.
Signed-off-by: Hao Zhang <hao.zhang@mediatek.com>
Co-developed-by: Quan Zhou <quan.zhou@mediatek.com>
Signed-off-by: Quan Zhou <quan.zhou@mediatek.com>
Acked-by: Lorenzo Bianconi <lorenzo@kernel.org>
Signed-off-by: Felix Fietkau <nbd@nbd.name>

drivers/net/wireless/mediatek/mt76/mt76_connac_mcu.h

@@ -1190,6 +1190,7 @@ enum {
 	MCU_EXT_CMD_EFUSE_ACCESS = 0x01,
 	MCU_EXT_CMD_RF_REG_ACCESS = 0x02,
 	MCU_EXT_CMD_RF_TEST = 0x04,
+	MCU_EXT_CMD_ID_RADIO_ON_OFF_CTRL = 0x05,
 	MCU_EXT_CMD_PM_STATE_CTRL = 0x07,
 	MCU_EXT_CMD_CHANNEL_SWITCH = 0x08,
 	MCU_EXT_CMD_SET_TX_POWER_CTRL = 0x11,

drivers/net/wireless/mediatek/mt76/mt7921/main.c

@@ -242,6 +242,15 @@ int __mt7921_start(struct mt792x_phy *phy)
 
 	ieee80211_queue_delayed_work(mphy->hw, &mphy->mac_work,
 				     MT792x_WATCHDOG_TIME);
+	if (mt76_is_mmio(mphy->dev)) {
+		err = mt7921_mcu_radio_led_ctrl(phy->dev, EXT_CMD_RADIO_LED_CTRL_ENABLE);
+		if (err)
+			return err;
+
+		err = mt7921_mcu_radio_led_ctrl(phy->dev, EXT_CMD_RADIO_ON_LED);
+		if (err)
+			return err;
+	}
 
 	return 0;
 }
@@ -259,6 +268,22 @@ static int mt7921_start(struct ieee80211_hw *hw)
 	return err;
 }
 
+static void mt7921_stop(struct ieee80211_hw *hw)
+{
+	struct mt792x_dev *dev = mt792x_hw_dev(hw);
+	int err = 0;
+
+	if (mt76_is_mmio(&dev->mt76)) {
+		mt792x_mutex_acquire(dev);
+		err = mt7921_mcu_radio_led_ctrl(dev, EXT_CMD_RADIO_OFF_LED);
+		mt792x_mutex_release(dev);
+		if (err)
+			return;
+	}
+
+	mt792x_stop(hw);
+}
+
 static int
 mt7921_add_interface(struct ieee80211_hw *hw, struct ieee80211_vif *vif)
 {
@@ -1377,7 +1402,7 @@ static void mt7921_mgd_complete_tx(struct ieee80211_hw *hw,
 const struct ieee80211_ops mt7921_ops = {
 	.tx = mt792x_tx,
 	.start = mt7921_start,
-	.stop = mt792x_stop,
+	.stop = mt7921_stop,
 	.add_interface = mt7921_add_interface,
 	.remove_interface = mt792x_remove_interface,
 	.config = mt7921_config,

drivers/net/wireless/mediatek/mt76/mt7921/mcu.c

@@ -646,6 +646,20 @@ int mt7921_run_firmware(struct mt792x_dev *dev)
 }
 EXPORT_SYMBOL_GPL(mt7921_run_firmware);
 
+int mt7921_mcu_radio_led_ctrl(struct mt792x_dev *dev, u8 value)
+{
+	struct {
+		u8 ctrlid;
+		u8 rsv[3];
+	} __packed req = {
+		.ctrlid = value,
+	};
+
+	return mt76_mcu_send_msg(&dev->mt76, MCU_EXT_CMD(ID_RADIO_ON_OFF_CTRL),
+				&req, sizeof(req), false);
+}
+EXPORT_SYMBOL_GPL(mt7921_mcu_radio_led_ctrl);
+
 int mt7921_mcu_set_tx(struct mt792x_dev *dev, struct ieee80211_vif *vif)
 {
 	struct mt792x_vif *mvif = (struct mt792x_vif *)vif->drv_priv;

drivers/net/wireless/mediatek/mt76/mt7921/mt7921.h

@@ -27,6 +27,10 @@
 #define MCU_UNI_EVENT_ROC  0x27
 #define MCU_UNI_EVENT_CLC  0x80
 
+#define EXT_CMD_RADIO_LED_CTRL_ENABLE   0x1
+#define EXT_CMD_RADIO_ON_LED            0x2
+#define EXT_CMD_RADIO_OFF_LED           0x3
+
 enum {
 	UNI_ROC_ACQUIRE,
 	UNI_ROC_ABORT,
@@ -196,6 +200,7 @@ int mt7921_mcu_fw_log_2_host(struct mt792x_dev *dev, u8 ctrl);
 void mt7921_mcu_rx_event(struct mt792x_dev *dev, struct sk_buff *skb);
 int mt7921_mcu_set_rxfilter(struct mt792x_dev *dev, u32 fif,
 			    u8 bit_op, u32 bit_map);
+int mt7921_mcu_radio_led_ctrl(struct mt792x_dev *dev, u8 value);
 
 static inline u32
 mt7921_reg_map_l1(struct mt792x_dev *dev, u32 addr)

drivers/net/wireless/mediatek/mt76/mt7921/pci.c

@@ -427,6 +427,10 @@ static int mt7921_pci_suspend(struct device *device)
 	wait_event_timeout(dev->wait,
 			   !dev->regd_in_progress, 5 * HZ);
 
+	err = mt7921_mcu_radio_led_ctrl(dev, EXT_CMD_RADIO_OFF_LED);
+	if (err < 0)
+		goto restore_suspend;
+
 	err = mt76_connac_mcu_set_hif_suspend(mdev, true);
 	if (err)
 		goto restore_suspend;
@@ -525,9 +529,11 @@ static int mt7921_pci_resume(struct device *device)
 		mt76_connac_mcu_set_deep_sleep(&dev->mt76, false);
 
 	err = mt76_connac_mcu_set_hif_suspend(mdev, false);
+	if (err < 0)
+		goto failed;
 
 	mt7921_regd_update(dev);
-
+	err = mt7921_mcu_radio_led_ctrl(dev, EXT_CMD_RADIO_ON_LED);
 failed:
 	pm->suspended = false;