wifi: rtw89: add function prototype for coex request duration

The request duration comes from coex mechanism, indicating the
length of time that should be reserved for BT in each time division.
It is required to handle update notification when channel concurrency
processes. Since it will involve in both coex and wifi code flow, this
commit ahead adds the prototype for required function interfaces to
split the implementation of coex and wifi in the following.

The follow-up are expected be add afterwards.
1. coex mechanism call rtw89_core_ntfy_btc_event() once bt req len changes
2. channel concurrency flow updates related stuffs when notified
Signed-off-by: Zong-Zhe Yang <kevin_yang@realtek.com>
Signed-off-by: Ping-Ke Shih <pkshih@realtek.com>
Signed-off-by: Kalle Valo <kvalo@kernel.org>
Link: https://lore.kernel.org/r/20230816082133.57474-2-pkshih@realtek.com

drivers/net/wireless/realtek/rtw89/coex.h

@@ -193,4 +193,13 @@ static inline u8 rtw89_btc_path_phymap(struct rtw89_dev *rtwdev,
 	return rtw89_btc_phymap(rtwdev, phy_idx, BIT(path));
 }
 
+/* return bt req len in TU */
+static inline u16 rtw89_coex_query_bt_req_len(struct rtw89_dev *rtwdev,
+					      enum rtw89_phy_idx phy_idx)
+{
+	struct rtw89_btc *btc = &rtwdev->btc;
+
+	return btc->bt_req_len;
+}
+
 #endif

drivers/net/wireless/realtek/rtw89/core.c

@@ -3464,6 +3464,27 @@ void rtw89_complete_cond(struct rtw89_wait_info *wait, unsigned int cond,
 	complete(&wait->completion);
 }
 
+void rtw89_core_ntfy_btc_event(struct rtw89_dev *rtwdev, enum rtw89_btc_hmsg event)
+{
+	u16 bt_req_len;
+
+	switch (event) {
+	case RTW89_BTC_HMSG_SET_BT_REQ_SLOT:
+		bt_req_len = rtw89_coex_query_bt_req_len(rtwdev, RTW89_PHY_0);
+		rtw89_debug(rtwdev, RTW89_DBG_BTC,
+			    "coex updates BT req len to %d TU\n", bt_req_len);
+		break;
+	default:
+		if (event < NUM_OF_RTW89_BTC_HMSG)
+			rtw89_debug(rtwdev, RTW89_DBG_BTC,
+				    "unhandled BTC HMSG event: %d\n", event);
+		else
+			rtw89_warn(rtwdev,
+				   "unrecognized BTC HMSG event: %d\n", event);
+		break;
+	}
+}
+
 int rtw89_core_start(struct rtw89_dev *rtwdev)
 {
 	int ret;

drivers/net/wireless/realtek/rtw89/core.h

@@ -2656,6 +2656,17 @@ struct rtw89_btc {
 	bool lps;
 };
 
+enum rtw89_btc_hmsg {
+	RTW89_BTC_HMSG_TMR_EN = 0x0,
+	RTW89_BTC_HMSG_BT_REG_READBACK = 0x1,
+	RTW89_BTC_HMSG_SET_BT_REQ_SLOT = 0x2,
+	RTW89_BTC_HMSG_FW_EV = 0x3,
+	RTW89_BTC_HMSG_BT_LINK_CHG = 0x4,
+	RTW89_BTC_HMSG_SET_BT_REQ_STBC = 0x5,
+
+	NUM_OF_RTW89_BTC_HMSG,
+};
+
 enum rtw89_ra_mode {
 	RTW89_RA_MODE_CCK = BIT(0),
 	RTW89_RA_MODE_OFDM = BIT(1),
@@ -5325,5 +5336,6 @@ void rtw89_core_scan_complete(struct rtw89_dev *rtwdev,
 			      struct ieee80211_vif *vif, bool hw_scan);
 void rtw89_reg_6ghz_power_recalc(struct rtw89_dev *rtwdev,
 				 struct rtw89_vif *rtwvif, bool active);
+void rtw89_core_ntfy_btc_event(struct rtw89_dev *rtwdev, enum rtw89_btc_hmsg event);
 
 #endif