From: YN Chen <redacted>

add .set_sar_specs to allow configuring SAR power limitations on the
frequency ranges from the userland.

Co-developed-by: Sean Wang <sean.wang@mediatek.com>
Signed-off-by: Sean Wang <sean.wang@mediatek.com>
Signed-off-by: YN Chen <redacted>
---
v2: 1. loop enhancement with considering no overlapping freqs
    2. error handling for devm_kcalloc
    3. sanity check without acquire lock
---
 drivers/net/wireless/mediatek/mt76/mt76.h     |  3 ++
 .../net/wireless/mediatek/mt76/mt76_connac.h  |  5 +++
 .../wireless/mediatek/mt76/mt76_connac_mcu.c  | 26 +++++++++++-
 .../net/wireless/mediatek/mt76/mt7921/init.c  | 33 ++++++++++++++-
 .../net/wireless/mediatek/mt76/mt7921/main.c  | 41
+++++++++++++++++++
 5 files changed, 105 insertions(+), 3 deletions(-)

diff --git a/drivers/net/wireless/mediatek/mt76/mt76.h

b/drivers/net/wireless/mediatek/mt76/mt76.h
index 25c5ceef5257..63ce5242c4d5 100644

--- a/drivers/net/wireless/mediatek/mt76/mt76.h
+++ b/drivers/net/wireless/mediatek/mt76/mt76.h

@@ -636,6 +636,9 @@ struct mt76_phy {
 		struct sk_buff **tail;
 		u16 seqno;
 	} rx_amsdu[__MT_RXQ_MAX];
+
+	void *frp_data;
+	u8 num_frps;
 };
 
 struct mt76_dev {

diff --git a/drivers/net/wireless/mediatek/mt76/mt76_connac.h

b/drivers/net/wireless/mediatek/mt76/mt76_connac.h
index f49d97d0a1c5..95c7d1cac7c4 100644

--- a/drivers/net/wireless/mediatek/mt76/mt76_connac.h
+++ b/drivers/net/wireless/mediatek/mt76/mt76_connac.h

@@ -83,6 +83,11 @@ struct mt76_connac_coredump {
 	unsigned long last_activity;
 };
 
+struct mt76_connac_freq_range_power {
+	const struct cfg80211_sar_freq_ranges *range;
+	s8 power;
+};
+
 extern const struct wiphy_wowlan_support mt76_connac_wowlan_support;
 
 static inline bool is_mt7921(struct mt76_dev *dev)

diff --git a/drivers/net/wireless/mediatek/mt76/mt76_connac_mcu.c

b/drivers/net/wireless/mediatek/mt76/mt76_connac_mcu.c
index 5c3a81e5f559..497de1d91c7c 100644

--- a/drivers/net/wireless/mediatek/mt76/mt76_connac_mcu.c
+++ b/drivers/net/wireless/mediatek/mt76/mt76_connac_mcu.c

@@ -1749,6 +1749,26 @@ mt76_connac_mcu_build_sku(struct mt76_dev

*dev, s8 *sku,
 	}
 }
 
+static s8 mt76_connac_get_sar_power(struct mt76_phy *phy,
+				    struct ieee80211_channel *chan,
+				    s8 target_power)
+{
+	struct mt76_connac_freq_range_power *frp = phy->frp_data;
+	int freq, i;
+
+	freq = ieee80211_channel_to_frequency(chan->hw_value, chan-

quoted

band);

+	for (i = 0 ; i < phy->num_frps; i++) {
+		if (frp[i].range &&
+		    freq >= frp[i].range->start_freq &&
+		    freq < frp[i].range->end_freq) {
+			target_power = min_t(s8, frp[i].power,
target_power);
+			break;
+		}
+	}
+
+	return target_power;
+}
+
 static int
 mt76_connac_mcu_rate_txpower_band(struct mt76_phy *phy,
 				  enum nl80211_band band)

@@ -1816,9 +1836,13 @@ mt76_connac_mcu_rate_txpower_band(struct

mt76_phy *phy,
 				.hw_value = ch_list[idx],
 				.band = band,
 			};
+			s8 sar_power;
+
+			sar_power = mt76_connac_get_sar_power(phy,
&chan,
+							      tx_power)
;
 
 			mt76_get_rate_power_limits(phy, &chan, &limits,
-						   tx_power);
+						   sar_power);
 
 			tx_power_tlv.last_msg = ch_list[idx] ==
last_ch;
 			sku_tlbv.channel = ch_list[idx];

diff --git a/drivers/net/wireless/mediatek/mt76/mt7921/init.c

b/drivers/net/wireless/mediatek/mt76/mt7921/init.c
index a9ce10b98827..c11a5b925209 100644

--- a/drivers/net/wireless/mediatek/mt76/mt7921/init.c
+++ b/drivers/net/wireless/mediatek/mt76/mt7921/init.c

@@ -24,6 +24,20 @@ static const struct ieee80211_iface_combination

if_comb[] = {
 	}
 };
 
+const struct cfg80211_sar_freq_ranges mt7921_sar_freq_ranges[] = {
+	{ .start_freq = 2402, .end_freq = 2494, },
+	{ .start_freq = 5150, .end_freq = 5350, },
+	{ .start_freq = 5350, .end_freq = 5470, },
+	{ .start_freq = 5470, .end_freq = 5725, },
+	{ .start_freq = 5725, .end_freq = 5950, },
+};
+
+static const struct cfg80211_sar_capa mt7921_sar_capa = {
+	.type = NL80211_SAR_TYPE_POWER,
+	.num_freq_ranges = ARRAY_SIZE(mt7921_sar_freq_ranges),
+	.freq_ranges = &mt7921_sar_freq_ranges[0],
+};
+