[PATCH v3] mt76: mt7921: add .set_sar_specs support
sean.wang at mediatek.com
sean.wang at mediatek.com
Mon Jun 28 16:05:53 PDT 2021
From: YN Chen <YN.Chen at mediatek.com>
add .set_sar_specs to allow configuring SAR power limitations on the
frequency ranges from the userland.
Co-developed-by: Sean Wang <sean.wang at mediatek.com>
Signed-off-by: Sean Wang <sean.wang at mediatek.com>
Signed-off-by: YN Chen <YN.Chen at mediatek.com>
---
v2: 1. loop enhancement with considering no overlapping freqs
2. error handling for devm_kcalloc
3. sanity check without acquire lock
v3:
1. move cfg80211_sar_capa to mt76 core to provide a common
ground to other mt76 station devices
2. remove uneccessary condition check because nl80211_set_sar_specs
already did it
---
drivers/net/wireless/mediatek/mt76/mac80211.c | 15 ++++++++
drivers/net/wireless/mediatek/mt76/mt76.h | 8 ++++
.../wireless/mediatek/mt76/mt76_connac_mcu.c | 30 ++++++++++++++-
.../net/wireless/mediatek/mt76/mt7921/init.c | 17 ++++++++-
.../net/wireless/mediatek/mt76/mt7921/main.c | 38 +++++++++++++++++++
5 files changed, 105 insertions(+), 3 deletions(-)
diff --git a/drivers/net/wireless/mediatek/mt76/mac80211.c b/drivers/net/wireless/mediatek/mt76/mac80211.c
index d03aedc3286b..ee3a5b8d62d2 100644
--- a/drivers/net/wireless/mediatek/mt76/mac80211.c
+++ b/drivers/net/wireless/mediatek/mt76/mac80211.c
@@ -99,6 +99,21 @@ struct ieee80211_rate mt76_rates[] = {
};
EXPORT_SYMBOL_GPL(mt76_rates);
+static const struct cfg80211_sar_freq_ranges mt76_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, },
+};
+
+const struct cfg80211_sar_capa mt76_sar_capa = {
+ .type = NL80211_SAR_TYPE_POWER,
+ .num_freq_ranges = ARRAY_SIZE(mt76_sar_freq_ranges),
+ .freq_ranges = &mt76_sar_freq_ranges[0],
+};
+EXPORT_SYMBOL_GPL(mt76_sar_capa);
+
static int mt76_led_init(struct mt76_dev *dev)
{
struct device_node *np = dev->dev->of_node;
diff --git a/drivers/net/wireless/mediatek/mt76/mt76.h b/drivers/net/wireless/mediatek/mt76/mt76.h
index 25c5ceef5257..ec42b87c9779 100644
--- a/drivers/net/wireless/mediatek/mt76/mt76.h
+++ b/drivers/net/wireless/mediatek/mt76/mt76.h
@@ -545,6 +545,11 @@ struct mt76_rx_status {
s8 chain_signal[IEEE80211_MAX_CHAINS];
};
+struct mt76_freq_range_power {
+ const struct cfg80211_sar_freq_ranges *range;
+ s8 power;
+};
+
struct mt76_testmode_ops {
int (*set_state)(struct mt76_phy *phy, enum mt76_testmode_state state);
int (*set_params)(struct mt76_phy *phy, struct nlattr **tb,
@@ -636,6 +641,8 @@ struct mt76_phy {
struct sk_buff **tail;
u16 seqno;
} rx_amsdu[__MT_RXQ_MAX];
+
+ struct mt76_freq_range_power *frp;
};
struct mt76_dev {
@@ -769,6 +776,7 @@ enum mt76_phy_type {
}
extern struct ieee80211_rate mt76_rates[12];
+extern const struct cfg80211_sar_capa mt76_sar_capa;
#define __mt76_rr(dev, ...) (dev)->bus->rr((dev), __VA_ARGS__)
#define __mt76_wr(dev, ...) (dev)->bus->wr((dev), __VA_ARGS__)
diff --git a/drivers/net/wireless/mediatek/mt76/mt76_connac_mcu.c b/drivers/net/wireless/mediatek/mt76/mt76_connac_mcu.c
index 5c3a81e5f559..a2555dc0f003 100644
--- a/drivers/net/wireless/mediatek/mt76/mt76_connac_mcu.c
+++ b/drivers/net/wireless/mediatek/mt76/mt76_connac_mcu.c
@@ -1749,6 +1749,30 @@ 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)
+{
+ const struct cfg80211_sar_capa *capa = phy->hw->wiphy->sar_capa;
+ struct mt76_freq_range_power *frp = phy->frp;
+ int freq, i;
+
+ if (!capa || !frp)
+ return target_power;
+
+ freq = ieee80211_channel_to_frequency(chan->hw_value, chan->band);
+ for (i = 0 ; i < capa->num_freq_ranges; 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 +1840,13 @@ 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..865cf8192e34 100644
--- a/drivers/net/wireless/mediatek/mt76/mt7921/init.c
+++ b/drivers/net/wireless/mediatek/mt76/mt7921/init.c
@@ -41,7 +41,7 @@ mt7921_regd_notifier(struct wiphy *wiphy,
mt7921_mutex_release(dev);
}
-static void
+static int
mt7921_init_wiphy(struct ieee80211_hw *hw)
{
struct mt7921_phy *phy = mt7921_hw_phy(hw);
@@ -75,6 +75,14 @@ mt7921_init_wiphy(struct ieee80211_hw *hw)
wiphy->max_sched_scan_reqs = 1;
wiphy->flags |= WIPHY_FLAG_HAS_CHANNEL_SWITCH;
wiphy->reg_notifier = mt7921_regd_notifier;
+ wiphy->sar_capa = &mt76_sar_capa;
+
+ phy->mt76->frp = devm_kcalloc(dev->mt76.dev,
+ wiphy->sar_capa->num_freq_ranges,
+ sizeof(struct mt76_freq_range_power),
+ GFP_KERNEL);
+ if (!phy->mt76->frp)
+ return -ENOMEM;
wiphy->features |= NL80211_FEATURE_SCHED_SCAN_RANDOM_MAC_ADDR |
NL80211_FEATURE_SCAN_RANDOM_MAC_ADDR;
@@ -92,6 +100,8 @@ mt7921_init_wiphy(struct ieee80211_hw *hw)
ieee80211_hw_set(hw, CONNECTION_MONITOR);
hw->max_tx_fragments = 4;
+
+ return 0;
}
static void
@@ -207,7 +217,10 @@ int mt7921_register_device(struct mt7921_dev *dev)
if (ret)
return ret;
- mt7921_init_wiphy(hw);
+ ret = mt7921_init_wiphy(hw);
+ if (ret)
+ return ret;
+
dev->mphy.sband_2g.sband.ht_cap.cap |=
IEEE80211_HT_CAP_LDPC_CODING |
IEEE80211_HT_CAP_MAX_AMSDU;
diff --git a/drivers/net/wireless/mediatek/mt76/mt7921/main.c b/drivers/net/wireless/mediatek/mt76/mt7921/main.c
index 7fd21049ff5a..c96a0d5408d9 100644
--- a/drivers/net/wireless/mediatek/mt76/mt7921/main.c
+++ b/drivers/net/wireless/mediatek/mt76/mt7921/main.c
@@ -1171,6 +1171,43 @@ static void mt7921_sta_set_decap_offload(struct ieee80211_hw *hw,
MCU_UNI_CMD_STA_REC_UPDATE);
}
+static int mt7921_set_sar_specs(struct ieee80211_hw *hw,
+ const struct cfg80211_sar_specs *sar)
+{
+ const struct cfg80211_sar_capa *capa = hw->wiphy->sar_capa;
+ struct mt7921_dev *dev = mt7921_hw_dev(hw);
+ struct mt76_freq_range_power *data, *frp;
+ struct mt76_phy *mphy = hw->priv;
+ int err;
+ u32 i;
+
+ if (sar->type != NL80211_SAR_TYPE_POWER || !sar->num_sub_specs)
+ return -EINVAL;
+
+ mt7921_mutex_acquire(dev);
+
+ data = mphy->frp;
+
+ for (i = 0; i < sar->num_sub_specs; i++) {
+ u32 index = sar->sub_specs[i].freq_range_index;
+ /* SAR specifies power limitaton in 0.25dbm */
+ s32 power = sar->sub_specs[i].power >> 1;
+
+ if (power > 127 || power < -127)
+ power = 127;
+
+ frp = &data[index];
+ frp->range = &capa->freq_ranges[index];
+ frp->power = power;
+ }
+
+ err = mt76_connac_mcu_set_rate_txpower(mphy);
+
+ mt7921_mutex_release(dev);
+
+ return err;
+}
+
const struct ieee80211_ops mt7921_ops = {
.tx = mt7921_tx,
.start = mt7921_start,
@@ -1209,4 +1246,5 @@ const struct ieee80211_ops mt7921_ops = {
.set_rekey_data = mt7921_set_rekey_data,
#endif /* CONFIG_PM */
.flush = mt7921_flush,
+ .set_sar_specs = mt7921_set_sar_specs,
};
--
2.25.1
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