mt76: mt76x02: introduce SAR support

Add SAR spec support to mt76x02 driver to allow configuring SAR power
limitations on the frequency ranges from the userland.
Signed-off-by: Lorenzo Bianconi <lorenzo@kernel.org>
Signed-off-by: Felix Fietkau <nbd@nbd.name>

drivers/net/wireless/mediatek/mt76/mt76x0/init.c

@@ -237,7 +237,10 @@ int mt76x0_register_device(struct mt76x02_dev *dev)
 {
 	int ret;
 
-	mt76x02_init_device(dev);
+	ret = mt76x02_init_device(dev);
+	if (ret)
+		return ret;
+
 	mt76x02_config_mac_addr_list(dev);
 
 	ret = mt76_register_device(&dev->mt76, true, mt76x02_rates,

drivers/net/wireless/mediatek/mt76/mt76x0/main.c

@@ -31,6 +31,32 @@ mt76x0_set_channel(struct mt76x02_dev *dev, struct cfg80211_chan_def *chandef)
 	mt76_txq_schedule_all(&dev->mphy);
 }
 
+int mt76x0_set_sar_specs(struct ieee80211_hw *hw,
+			 const struct cfg80211_sar_specs *sar)
+{
+	int err = -EINVAL, power = hw->conf.power_level * 2;
+	struct mt76x02_dev *dev = hw->priv;
+	struct mt76_phy *mphy = &dev->mphy;
+
+	mutex_lock(&dev->mt76.mutex);
+	if (!cfg80211_chandef_valid(&mphy->chandef))
+		goto out;
+
+	err = mt76_init_sar_power(hw, sar);
+	if (err)
+		goto out;
+
+	dev->txpower_conf = mt76_get_sar_power(mphy, mphy->chandef.chan,
+					       power);
+	if (test_bit(MT76_STATE_RUNNING, &mphy->state))
+		mt76x0_phy_set_txpower(dev);
+out:
+	mutex_unlock(&dev->mt76.mutex);
+
+	return err;
+}
+EXPORT_SYMBOL_GPL(mt76x0_set_sar_specs);
+
 int mt76x0_config(struct ieee80211_hw *hw, u32 changed)
 {
 	struct mt76x02_dev *dev = hw->priv;
@@ -44,9 +70,13 @@ int mt76x0_config(struct ieee80211_hw *hw, u32 changed)
 	}
 
 	if (changed & IEEE80211_CONF_CHANGE_POWER) {
-		dev->txpower_conf = hw->conf.power_level * 2;
+		struct mt76_phy *mphy = &dev->mphy;
 
-		if (test_bit(MT76_STATE_RUNNING, &dev->mphy.state))
+		dev->txpower_conf = hw->conf.power_level * 2;
+		dev->txpower_conf = mt76_get_sar_power(mphy,
+						       mphy->chandef.chan,
+						       dev->txpower_conf);
+		if (test_bit(MT76_STATE_RUNNING, &mphy->state))
 			mt76x0_phy_set_txpower(dev);
 	}
 

drivers/net/wireless/mediatek/mt76/mt76x0/mt76x0.h

@@ -49,6 +49,8 @@ void mt76x0_chip_onoff(struct mt76x02_dev *dev, bool enable, bool reset);
 void mt76x0_mac_stop(struct mt76x02_dev *dev);
 
 int mt76x0_config(struct ieee80211_hw *hw, u32 changed);
+int mt76x0_set_sar_specs(struct ieee80211_hw *hw,
+			 const struct cfg80211_sar_specs *sar);
 
 /* PHY */
 void mt76x0_phy_init(struct mt76x02_dev *dev);

drivers/net/wireless/mediatek/mt76/mt76x0/pci.c

@@ -85,6 +85,7 @@ static const struct ieee80211_ops mt76x0e_ops = {
 	.set_rts_threshold = mt76x02_set_rts_threshold,
 	.get_antenna = mt76_get_antenna,
 	.reconfig_complete = mt76x02_reconfig_complete,
+	.set_sar_specs = mt76x0_set_sar_specs,
 };
 
 static int mt76x0e_init_hardware(struct mt76x02_dev *dev, bool resume)

drivers/net/wireless/mediatek/mt76/mt76x0/usb.c

@@ -141,6 +141,7 @@ static const struct ieee80211_ops mt76x0u_ops = {
 	.set_tim = mt76_set_tim,
 	.release_buffered_frames = mt76_release_buffered_frames,
 	.get_antenna = mt76_get_antenna,
+	.set_sar_specs = mt76x0_set_sar_specs,
 };
 
 static int mt76x0u_init_hardware(struct mt76x02_dev *dev, bool reset)

drivers/net/wireless/mediatek/mt76/mt76x02.h

@@ -133,7 +133,7 @@ struct mt76x02_dev {
 
 extern struct ieee80211_rate mt76x02_rates[12];
 
-void mt76x02_init_device(struct mt76x02_dev *dev);
+int mt76x02_init_device(struct mt76x02_dev *dev);
 void mt76x02_configure_filter(struct ieee80211_hw *hw,
 			      unsigned int changed_flags,
 			      unsigned int *total_flags, u64 multicast);

drivers/net/wireless/mediatek/mt76/mt76x02_util.c

@@ -138,7 +138,7 @@ mt76x02_led_set_brightness(struct led_classdev *led_cdev,
 		mt76x02_led_set_config(mdev, 0xff, 0);
 }
 
-void mt76x02_init_device(struct mt76x02_dev *dev)
+int mt76x02_init_device(struct mt76x02_dev *dev)
 {
 	struct ieee80211_hw *hw = mt76_hw(dev);
 	struct wiphy *wiphy = hw->wiphy;
@@ -174,6 +174,13 @@ void mt76x02_init_device(struct mt76x02_dev *dev)
 	}
 
 	wiphy_ext_feature_set(wiphy, NL80211_EXT_FEATURE_VHT_IBSS);
+	wiphy->sar_capa = &mt76_sar_capa;
+	dev->mt76.phy.frp = devm_kcalloc(dev->mt76.dev,
+					 wiphy->sar_capa->num_freq_ranges,
+					 sizeof(struct mt76_freq_range_power),
+					 GFP_KERNEL);
+	if (!dev->mt76.phy.frp)
+		return -ENOMEM;
 
 	hw->sta_data_size = sizeof(struct mt76x02_sta);
 	hw->vif_data_size = sizeof(struct mt76x02_vif);
@@ -197,6 +204,8 @@ void mt76x02_init_device(struct mt76x02_dev *dev)
 		dev->mphy.chainmask = 0x101;
 		dev->mphy.antenna_mask = 1;
 	}
+
+	return 0;
 }
 EXPORT_SYMBOL_GPL(mt76x02_init_device);
 

drivers/net/wireless/mediatek/mt76/mt76x2/init.c

@@ -8,6 +8,35 @@
 #include "eeprom.h"
 #include "../mt76x02_phy.h"
 
+int mt76x2_set_sar_specs(struct ieee80211_hw *hw,
+			 const struct cfg80211_sar_specs *sar)
+{
+	int err = -EINVAL, power = hw->conf.power_level * 2;
+	struct mt76x02_dev *dev = hw->priv;
+	struct mt76_phy *mphy = &dev->mphy;
+
+	mutex_lock(&dev->mt76.mutex);
+	if (!cfg80211_chandef_valid(&mphy->chandef))
+		goto out;
+
+	err = mt76_init_sar_power(hw, sar);
+	if (err)
+		goto out;
+
+	dev->txpower_conf = mt76_get_sar_power(mphy, mphy->chandef.chan,
+					       power);
+	/* convert to per-chain power for 2x2 devices */
+	dev->txpower_conf -= 6;
+
+	if (test_bit(MT76_STATE_RUNNING, &mphy->state))
+		mt76x2_phy_set_txpower(dev);
+out:
+	mutex_unlock(&dev->mt76.mutex);
+
+	return err;
+}
+EXPORT_SYMBOL_GPL(mt76x2_set_sar_specs);
+
 static void
 mt76x2_set_wlan_state(struct mt76x02_dev *dev, bool enable)
 {

drivers/net/wireless/mediatek/mt76/mt76x2/mt76x2.h

@@ -41,6 +41,8 @@ extern const struct ieee80211_ops mt76x2_ops;
 int mt76x2_register_device(struct mt76x02_dev *dev);
 int mt76x2_resume_device(struct mt76x02_dev *dev);
 
+int mt76x2_set_sar_specs(struct ieee80211_hw *hw,
+			 const struct cfg80211_sar_specs *sar);
 void mt76x2_phy_power_on(struct mt76x02_dev *dev);
 void mt76x2_stop_hardware(struct mt76x02_dev *dev);
 int mt76x2_eeprom_init(struct mt76x02_dev *dev);

drivers/net/wireless/mediatek/mt76/mt76x2/pci_init.c

@@ -292,8 +292,9 @@ int mt76x2_register_device(struct mt76x02_dev *dev)
 	int ret;
 
 	INIT_DELAYED_WORK(&dev->cal_work, mt76x2_phy_calibrate);
-
-	mt76x02_init_device(dev);
+	ret = mt76x02_init_device(dev);
+	if (ret)
+		return ret;
 
 	ret = mt76x2_init_hardware(dev);
 	if (ret)

drivers/net/wireless/mediatek/mt76/mt76x2/pci_main.c

@@ -78,8 +78,12 @@ mt76x2_config(struct ieee80211_hw *hw, u32 changed)
 	}
 
 	if (changed & IEEE80211_CONF_CHANGE_POWER) {
-		dev->txpower_conf = hw->conf.power_level * 2;
+		struct mt76_phy *mphy = &dev->mphy;
 
+		dev->txpower_conf = hw->conf.power_level * 2;
+		dev->txpower_conf = mt76_get_sar_power(mphy,
+						       mphy->chandef.chan,
+						       dev->txpower_conf);
 		/* convert to per-chain power for 2x2 devices */
 		dev->txpower_conf -= 6;
 
@@ -155,5 +159,6 @@ const struct ieee80211_ops mt76x2_ops = {
 	.get_antenna = mt76_get_antenna,
 	.set_rts_threshold = mt76x02_set_rts_threshold,
 	.reconfig_complete = mt76x02_reconfig_complete,
+	.set_sar_specs = mt76x2_set_sar_specs,
 };
 

drivers/net/wireless/mediatek/mt76/mt76x2/usb_init.c

@@ -194,7 +194,9 @@ int mt76x2u_register_device(struct mt76x02_dev *dev)
 	int err;
 
 	INIT_DELAYED_WORK(&dev->cal_work, mt76x2u_phy_calibrate);
-	mt76x02_init_device(dev);
+	err = mt76x02_init_device(dev);
+	if (err)
+		return err;
 
 	err = mt76x2u_init_eeprom(dev);
 	if (err < 0)

drivers/net/wireless/mediatek/mt76/mt76x2/usb_main.c

@@ -78,12 +78,16 @@ mt76x2u_config(struct ieee80211_hw *hw, u32 changed)
 	}
 
 	if (changed & IEEE80211_CONF_CHANGE_POWER) {
-		dev->txpower_conf = hw->conf.power_level * 2;
+		struct mt76_phy *mphy = &dev->mphy;
 
+		dev->txpower_conf = hw->conf.power_level * 2;
+		dev->txpower_conf = mt76_get_sar_power(mphy,
+						       mphy->chandef.chan,
+						       dev->txpower_conf);
 		/* convert to per-chain power for 2x2 devices */
 		dev->txpower_conf -= 6;
 
-		if (test_bit(MT76_STATE_RUNNING, &dev->mphy.state))
+		if (test_bit(MT76_STATE_RUNNING, &mphy->state))
 			mt76x2_phy_set_txpower(dev);
 	}
 
@@ -121,4 +125,5 @@ const struct ieee80211_ops mt76x2u_ops = {
 	.set_tim = mt76_set_tim,
 	.release_buffered_frames = mt76_release_buffered_frames,
 	.get_antenna = mt76_get_antenna,
+	.set_sar_specs = mt76x2_set_sar_specs,
 };