wifi: mt76: mt7921: Support temp sensor

Allow sensors tool to read radio's temperature, example:

mt7921_phy17-pci-1800
Adapter: PCI adapter
temp1:        +72.0°C

Signed-off-by: Ben Greear <greearb@candelatech.com>
Signed-off-by: Felix Fietkau <nbd@nbd.name>

diff --git a/drivers/net/wireless/mediatek/mt76/mt7921/init.c b/drivers/net/wireless/mediatek/mt76/mt7921/init.c
index f41975e..73a31ef 100644 (file)
--- a/drivers/net/wireless/mediatek/mt76/mt7921/init.c
+++ b/drivers/net/wireless/mediatek/mt76/mt7921/init.c
@@ -2,6 +2,9 @@
 /* Copyright (C) 2020 MediaTek Inc. */
 
 #include <linux/etherdevice.h>
+#include <linux/hwmon.h>
+#include <linux/hwmon-sysfs.h>
+#include <linux/thermal.h>
 #include <linux/firmware.h>
 #include "mt7921.h"
 #include "../mt76_connac2_mac.h"
@@ -51,6 +54,57 @@ static const struct ieee80211_iface_combination if_comb_chanctx[] = {
        }
 };
 
+static ssize_t mt7921_thermal_temp_show(struct device *dev,
+                                       struct device_attribute *attr,
+                                       char *buf)
+{
+       switch (to_sensor_dev_attr(attr)->index) {
+       case 0: {
+               struct mt7921_phy *phy = dev_get_drvdata(dev);
+               struct mt7921_dev *mdev = phy->dev;
+               int temperature;
+
+               mt7921_mutex_acquire(mdev);
+               temperature = mt7921_mcu_get_temperature(phy);
+               mt7921_mutex_release(mdev);
+
+               if (temperature < 0)
+                       return temperature;
+               /* display in millidegree Celsius */
+               return sprintf(buf, "%u\n", temperature * 1000);
+       }
+       default:
+               return -EINVAL;
+       }
+}
+static SENSOR_DEVICE_ATTR_RO(temp1_input, mt7921_thermal_temp, 0);
+
+static struct attribute *mt7921_hwmon_attrs[] = {
+       &sensor_dev_attr_temp1_input.dev_attr.attr,
+       NULL,
+};
+ATTRIBUTE_GROUPS(mt7921_hwmon);
+
+static int mt7921_thermal_init(struct mt7921_phy *phy)
+{
+       struct wiphy *wiphy = phy->mt76->hw->wiphy;
+       struct device *hwmon;
+       const char *name;
+
+       if (!IS_REACHABLE(CONFIG_HWMON))
+               return 0;
+
+       name = devm_kasprintf(&wiphy->dev, GFP_KERNEL, "mt7921_%s",
+                             wiphy_name(wiphy));
+
+       hwmon = devm_hwmon_device_register_with_groups(&wiphy->dev, name, phy,
+                                                      mt7921_hwmon_groups);
+       if (IS_ERR(hwmon))
+               return PTR_ERR(hwmon);
+
+       return 0;
+}
+
 static void
 mt7921_regd_notifier(struct wiphy *wiphy,
                     struct regulatory_request *request)
@@ -363,6 +417,12 @@ static void mt7921_init_work(struct work_struct *work)
                return;
        }
 
+       ret = mt7921_thermal_init(&dev->phy);
+       if (ret) {
+               dev_err(dev->mt76.dev, "thermal init failed\n");
+               return;
+       }
+
        /* we support chip reset now */
        dev->hw_init_done = true;
 

diff --git a/drivers/net/wireless/mediatek/mt76/mt7921/mcu.c b/drivers/net/wireless/mediatek/mt76/mt7921/mcu.c
index f55caa0..a0ad18c 100644 (file)
--- a/drivers/net/wireless/mediatek/mt76/mt7921/mcu.c
+++ b/drivers/net/wireless/mediatek/mt76/mt7921/mcu.c
@@ -1305,6 +1305,23 @@ int mt7921_mcu_set_clc(struct mt7921_dev *dev, u8 *alpha2,
        return 0;
 }
 
+int mt7921_mcu_get_temperature(struct mt7921_phy *phy)
+{
+       struct mt7921_dev *dev = phy->dev;
+       struct {
+               u8 ctrl_id;
+               u8 action;
+               u8 band_idx;
+               u8 rsv[5];
+       } req = {
+               .ctrl_id = THERMAL_SENSOR_TEMP_QUERY,
+               .band_idx = phy->mt76->band_idx,
+       };
+
+       return mt76_mcu_send_msg(&dev->mt76, MCU_EXT_CMD(THERMAL_CTRL), &req,
+                                sizeof(req), true);
+}
+
 int mt7921_mcu_set_rxfilter(struct mt7921_dev *dev, u32 fif,
                            u8 bit_op, u32 bit_map)
 {

diff --git a/drivers/net/wireless/mediatek/mt76/mt7921/mt7921.h b/drivers/net/wireless/mediatek/mt76/mt7921/mt7921.h
index 76dc253..3776055 100644 (file)
--- a/drivers/net/wireless/mediatek/mt76/mt7921/mt7921.h
+++ b/drivers/net/wireless/mediatek/mt76/mt7921/mt7921.h
@@ -511,6 +511,7 @@ int mt7921_mcu_set_sniffer(struct mt7921_dev *dev, struct ieee80211_vif *vif,
                           bool enable);
 int mt7921_mcu_config_sniffer(struct mt7921_vif *vif,
                              struct ieee80211_chanctx_conf *ctx);
+int mt7921_mcu_get_temperature(struct mt7921_phy *phy);
 
 int mt7921_usb_sdio_tx_prepare_skb(struct mt76_dev *mdev, void *txwi_ptr,
                                   enum mt76_txq_id qid, struct mt76_wcid *wcid,