wifi: mt76: mt7921: add rfkill_poll for hardware rfkill

Add mac80211 rfkill_poll ops to monitor hardware rfkill state
and state change will be updated.

Signed-off-by: Allan Wang <allan.wang@mediatek.com>
Link: https://patch.msgid.link/20241209070922.28106-1-allan.wang@mediatek.com
Signed-off-by: Felix Fietkau <nbd@nbd.name>

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

@@ -1043,6 +1043,7 @@ enum {
 	MCU_EXT_EVENT_CSA_NOTIFY = 0x4f,
 	MCU_EXT_EVENT_WA_TX_STAT = 0x74,
 	MCU_EXT_EVENT_BCC_NOTIFY = 0x75,
+	MCU_EXT_EVENT_WF_RF_PIN_CTRL = 0x9a,
 	MCU_EXT_EVENT_MURU_CTRL = 0x9f,
 };
 
@@ -1251,6 +1252,7 @@ enum {
 	MCU_EXT_CMD_GROUP_PRE_CAL_INFO = 0xab,
 	MCU_EXT_CMD_DPD_PRE_CAL_INFO = 0xac,
 	MCU_EXT_CMD_PHY_STAT_INFO = 0xad,
+	MCU_EXT_CMD_WF_RF_PIN_CTRL = 0xbd,
 };
 
 enum {

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

@@ -252,6 +252,11 @@ int __mt7921_start(struct mt792x_phy *phy)
 			return err;
 	}
 
+	if (phy->chip_cap & MT792x_CHIP_CAP_WF_RF_PIN_CTRL_EVT_EN) {
+		mt7921_mcu_wf_rf_pin_ctrl(phy, WF_RF_PIN_INIT);
+		wiphy_rfkill_start_polling(mphy->hw->wiphy);
+	}
+
 	return 0;
 }
 EXPORT_SYMBOL_GPL(__mt7921_start);
@@ -1492,6 +1497,18 @@ static void mt7921_channel_switch_rx_beacon(struct ieee80211_hw *hw,
 	}
 }
 
+static void mt7921_rfkill_poll(struct ieee80211_hw *hw)
+{
+	struct mt792x_phy *phy = mt792x_hw_phy(hw);
+	int ret = 0;
+
+	mt792x_mutex_acquire(phy->dev);
+	ret = mt7921_mcu_wf_rf_pin_ctrl(phy, WF_RF_PIN_POLL);
+	mt792x_mutex_release(phy->dev);
+
+	wiphy_rfkill_set_hw_state(hw->wiphy, ret ? false : true);
+}
+
 const struct ieee80211_ops mt7921_ops = {
 	.tx = mt792x_tx,
 	.start = mt7921_start,
@@ -1542,6 +1559,7 @@ const struct ieee80211_ops mt7921_ops = {
 #endif /* CONFIG_PM */
 	.flush = mt792x_flush,
 	.set_sar_specs = mt7921_set_sar_specs,
+	.rfkill_poll = mt7921_rfkill_poll,
 	.remain_on_channel = mt7921_remain_on_channel,
 	.cancel_remain_on_channel = mt7921_cancel_remain_on_channel,
 	.add_chanctx = mt7921_add_chanctx,

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

@@ -61,6 +61,12 @@ int mt7921_mcu_parse_response(struct mt76_dev *mdev, int cmd,
 		skb_pull(skb, sizeof(*rxd));
 		event = (struct mt76_connac_mcu_reg_event *)skb->data;
 		ret = (int)le32_to_cpu(event->val);
+	} else if (cmd == MCU_EXT_CMD(WF_RF_PIN_CTRL)) {
+		struct mt7921_wf_rf_pin_ctrl_event *event;
+
+		skb_pull(skb, sizeof(*rxd));
+		event = (struct mt7921_wf_rf_pin_ctrl_event *)skb->data;
+		ret = (int)event->result;
 	} else {
 		skb_pull(skb, sizeof(struct mt76_connac2_mcu_rxd));
 	}
@@ -1427,6 +1433,21 @@ int mt7921_mcu_get_temperature(struct mt792x_phy *phy)
 				 sizeof(req), true);
 }
 
+int mt7921_mcu_wf_rf_pin_ctrl(struct mt792x_phy *phy, u8 action)
+{
+	struct mt792x_dev *dev = phy->dev;
+	struct {
+		u8 action;
+		u8 value;
+	} req = {
+		.action = action,
+		.value = 0,
+	};
+
+	return mt76_mcu_send_msg(&dev->mt76, MCU_EXT_CMD(WF_RF_PIN_CTRL), &req,
+				 sizeof(req), action ? true : false);
+}
+
 int mt7921_mcu_set_rxfilter(struct mt792x_dev *dev, u32 fif,
 			    u8 bit_op, u32 bit_map)
 {

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

@@ -74,6 +74,11 @@ struct mt7921_txpwr_event {
 	struct mt7921_txpwr txpwr;
 } __packed;
 
+struct mt7921_wf_rf_pin_ctrl_event {
+	u8 result;
+	u8 value;
+} __packed;
+
 enum {
 	TM_SWITCH_MODE,
 	TM_SET_AT_CMD,

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

@@ -31,6 +31,9 @@
 #define EXT_CMD_RADIO_ON_LED            0x2
 #define EXT_CMD_RADIO_OFF_LED           0x3
 
+#define WF_RF_PIN_INIT		0x0
+#define WF_RF_PIN_POLL		0x1
+
 enum {
 	UNI_ROC_ACQUIRE,
 	UNI_ROC_ABORT,
@@ -202,6 +205,7 @@ 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);
+int mt7921_mcu_wf_rf_pin_ctrl(struct mt792x_phy *phy, u8 action);
 
 static inline u32
 mt7921_reg_map_l1(struct mt792x_dev *dev, u32 addr)

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

@@ -42,6 +42,10 @@ static void mt7921e_unregister_device(struct mt792x_dev *dev)
 {
 	int i;
 	struct mt76_connac_pm *pm = &dev->pm;
+	struct ieee80211_hw *hw = mt76_hw(dev);
+
+	if (dev->phy.chip_cap & MT792x_CHIP_CAP_WF_RF_PIN_CTRL_EVT_EN)
+		wiphy_rfkill_stop_polling(hw->wiphy);
 
 	cancel_work_sync(&dev->init_work);
 	mt76_unregister_device(&dev->mt76);

drivers/net/wireless/mediatek/mt76/mt792x.h

@@ -28,6 +28,7 @@
 #define MT792x_CHIP_CAP_CLC_EVT_EN BIT(0)
 #define MT792x_CHIP_CAP_RSSI_NOTIFY_EVT_EN BIT(1)
 #define MT792x_CHIP_CAP_MLO_EVT_EN BIT(2)
+#define MT792x_CHIP_CAP_WF_RF_PIN_CTRL_EVT_EN BIT(3)
 
 /* NOTE: used to map mt76_rates. idx may change if firmware expands table */
 #define MT792x_BASIC_RATES_TBL	11