From 297bcf8222f222fd7defead862de4b8e3ea0b08a Mon Sep 17 00:00:00 2001
From: Yan-Hsuan Chuang <yhchuang@realtek.com>
Date: Fri, 10 Apr 2020 18:09:50 +0800
Subject: [PATCH] rtw88: add support for set/get antennas
Git-commit: 297bcf8222f222fd7defead862de4b8e3ea0b08a
Patch-mainline: v5.8-rc1
References: jsc#SLE-13430, bsc#1176741

User space program such as iw can set antenna mask for the device.
So add set antenna support by configure the trx mode.

This is useful for some tests want to see the output of different
antenna configuration (e.g. path A v.s. path B).

Signed-off-by: Yan-Hsuan Chuang <yhchuang@realtek.com>
Signed-off-by: Kalle Valo <kvalo@codeaurora.org>
Link: https://lore.kernel.org/r/20200410100950.3199-3-yhchuang@realtek.com
Acked-by: Takashi Iwai <tiwai@suse.de>

---
 drivers/net/wireless/realtek/rtw88/mac80211.c | 33 +++++++++++++++++++++++++
 drivers/net/wireless/realtek/rtw88/main.c     |  3 +++
 drivers/net/wireless/realtek/rtw88/rtw8822c.c | 35 +++++++++++++++++++++++++++
 3 files changed, 71 insertions(+)

diff --git a/drivers/net/wireless/realtek/rtw88/mac80211.c b/drivers/net/wireless/realtek/rtw88/mac80211.c
index d7d02e4c0184..a2e6ef4ad9ee 100644
--- a/drivers/net/wireless/realtek/rtw88/mac80211.c
+++ b/drivers/net/wireless/realtek/rtw88/mac80211.c
@@ -754,6 +754,37 @@ static int rtw_ops_set_bitrate_mask(struct ieee80211_hw *hw,
 	return 0;
 }
 
+static int rtw_ops_set_antenna(struct ieee80211_hw *hw,
+			       u32 tx_antenna,
+			       u32 rx_antenna)
+{
+	struct rtw_dev *rtwdev = hw->priv;
+	struct rtw_chip_info *chip = rtwdev->chip;
+	int ret;
+
+	if (!chip->ops->set_antenna)
+		return -EOPNOTSUPP;
+
+	mutex_lock(&rtwdev->mutex);
+	ret = chip->ops->set_antenna(rtwdev, tx_antenna, rx_antenna);
+	mutex_unlock(&rtwdev->mutex);
+
+	return ret;
+}
+
+static int rtw_ops_get_antenna(struct ieee80211_hw *hw,
+			       u32 *tx_antenna,
+			       u32 *rx_antenna)
+{
+	struct rtw_dev *rtwdev = hw->priv;
+	struct rtw_hal *hal = &rtwdev->hal;
+
+	*tx_antenna = hal->antenna_tx;
+	*rx_antenna = hal->antenna_rx;
+
+	return 0;
+}
+
 #ifdef CONFIG_PM
 static int rtw_ops_suspend(struct ieee80211_hw *hw,
 			   struct cfg80211_wowlan *wowlan)
@@ -815,6 +846,8 @@ const struct ieee80211_ops rtw_ops = {
 	.sta_statistics		= rtw_ops_sta_statistics,
 	.flush			= rtw_ops_flush,
 	.set_bitrate_mask	= rtw_ops_set_bitrate_mask,
+	.set_antenna		= rtw_ops_set_antenna,
+	.get_antenna		= rtw_ops_get_antenna,
 #ifdef CONFIG_PM
 	.suspend		= rtw_ops_suspend,
 	.resume			= rtw_ops_resume,
diff --git a/drivers/net/wireless/realtek/rtw88/main.c b/drivers/net/wireless/realtek/rtw88/main.c
index 7640e97706f5..1e1d2c774287 100644
--- a/drivers/net/wireless/realtek/rtw88/main.c
+++ b/drivers/net/wireless/realtek/rtw88/main.c
@@ -1450,6 +1450,7 @@ EXPORT_SYMBOL(rtw_core_deinit);
 
 int rtw_register_hw(struct rtw_dev *rtwdev, struct ieee80211_hw *hw)
 {
+	struct rtw_hal *hal = &rtwdev->hal;
 	int max_tx_headroom = 0;
 	int ret;
 
@@ -1478,6 +1479,8 @@ int rtw_register_hw(struct rtw_dev *rtwdev, struct ieee80211_hw *hw)
 				     BIT(NL80211_IFTYPE_AP) |
 				     BIT(NL80211_IFTYPE_ADHOC) |
 				     BIT(NL80211_IFTYPE_MESH_POINT);
+	hw->wiphy->available_antennas_tx = hal->antenna_tx;
+	hw->wiphy->available_antennas_rx = hal->antenna_rx;
 
 	hw->wiphy->flags |= WIPHY_FLAG_SUPPORTS_TDLS |
 			    WIPHY_FLAG_TDLS_EXTERNAL_SETUP;
diff --git a/drivers/net/wireless/realtek/rtw88/rtw8822c.c b/drivers/net/wireless/realtek/rtw88/rtw8822c.c
index dc07e6be38e8..c99b1de54bfc 100644
--- a/drivers/net/wireless/realtek/rtw88/rtw8822c.c
+++ b/drivers/net/wireless/realtek/rtw88/rtw8822c.c
@@ -1890,6 +1890,40 @@ static void rtw8822c_set_tx_power_index(struct rtw_dev *rtwdev)
 	}
 }
 
+static int rtw8822c_set_antenna(struct rtw_dev *rtwdev,
+				u32 antenna_tx,
+				u32 antenna_rx)
+{
+	struct rtw_hal *hal = &rtwdev->hal;
+
+	switch (antenna_tx) {
+	case BB_PATH_A:
+	case BB_PATH_B:
+	case BB_PATH_AB:
+		break;
+	default:
+		rtw_info(rtwdev, "unsupport tx path 0x%x\n", antenna_tx);
+		return -EINVAL;
+	}
+
+	/* path B only is not available for RX */
+	switch (antenna_rx) {
+	case BB_PATH_A:
+	case BB_PATH_AB:
+		break;
+	default:
+		rtw_info(rtwdev, "unsupport rx path 0x%x\n", antenna_rx);
+		return -EINVAL;
+	}
+
+	hal->antenna_tx = antenna_tx;
+	hal->antenna_rx = antenna_rx;
+
+	rtw8822c_config_trx_mode(rtwdev, antenna_tx, antenna_rx, false);
+
+	return 0;
+}
+
 static void rtw8822c_cfg_ldo25(struct rtw_dev *rtwdev, bool enable)
 {
 	u8 ldo_pwr;
@@ -3794,6 +3828,7 @@ static struct rtw_chip_ops rtw8822c_ops = {
 	.read_rf		= rtw_phy_read_rf,
 	.write_rf		= rtw_phy_write_rf_reg_mix,
 	.set_tx_power_index	= rtw8822c_set_tx_power_index,
+	.set_antenna		= rtw8822c_set_antenna,
 	.cfg_ldo25		= rtw8822c_cfg_ldo25,
 	.false_alarm_statistics	= rtw8822c_false_alarm_statistics,
 	.dpk_track		= rtw8822c_dpk_track,
-- 
2.16.4