wifi: mt76: mt7925: support temperature sensor

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

mt7925_phy8-pci-3b00
Adapter: PCI adapter
temp1:        +35.0°C

Signed-off-by: Deren Wu <deren.wu@mediatek.com>
Signed-off-by: Felix Fietkau <nbd@nbd.name>

diff --git a/drivers/net/wireless/mediatek/mt76/mt7925/init.c b/drivers/net/wireless/mediatek/mt76/mt7925/init.c
index 8f9b7a2f376ce175b4b662a72a21abd440c65af7..c4cbc8976046096dcc3b13fabc49ac89eb5013a7 100644 (file)
--- a/drivers/net/wireless/mediatek/mt76/mt7925/init.c
+++ b/drivers/net/wireless/mediatek/mt76/mt7925/init.c
@@ -2,11 +2,61 @@
 /* Copyright (C) 2023 MediaTek Inc. */
 
 #include <linux/etherdevice.h>
+#include <linux/hwmon.h>
+#include <linux/hwmon-sysfs.h>
+#include <linux/thermal.h>
 #include <linux/firmware.h>
 #include "mt7925.h"
 #include "mac.h"
 #include "mcu.h"
 
+static ssize_t mt7925_thermal_temp_show(struct device *dev,
+                                       struct device_attribute *attr,
+                                       char *buf)
+{
+       switch (to_sensor_dev_attr(attr)->index) {
+       case 0: {
+               struct mt792x_phy *phy = dev_get_drvdata(dev);
+               struct mt792x_dev *mdev = phy->dev;
+               int temperature;
+
+               mt792x_mutex_acquire(mdev);
+               temperature = mt7925_mcu_get_temperature(phy);
+               mt792x_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, mt7925_thermal_temp, 0);
+
+static struct attribute *mt7925_hwmon_attrs[] = {
+       &sensor_dev_attr_temp1_input.dev_attr.attr,
+       NULL,
+};
+ATTRIBUTE_GROUPS(mt7925_hwmon);
+
+static int mt7925_thermal_init(struct mt792x_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, "mt7925_%s",
+                             wiphy_name(wiphy));
+
+       hwmon = devm_hwmon_device_register_with_groups(&wiphy->dev, name, phy,
+                                                      mt7925_hwmon_groups);
+       return PTR_ERR_OR_ZERO(hwmon);
+}
 static void
 mt7925_regd_notifier(struct wiphy *wiphy,
                     struct regulatory_request *req)
@@ -142,6 +192,12 @@ static void mt7925_init_work(struct work_struct *work)
                return;
        }
 
+       ret = mt7925_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/mt7925/mcu.c b/drivers/net/wireless/mediatek/mt76/mt7925/mcu.c
index e1dd89a7a79cad9f815de91811ea8ac4b67cafc8..bd37cb8d734b9a00999e3f9086e2214a7ac81771 100644 (file)
--- a/drivers/net/wireless/mediatek/mt76/mt7925/mcu.c
+++ b/drivers/net/wireless/mediatek/mt76/mt7925/mcu.c
@@ -656,6 +656,42 @@ int mt7925_mcu_fw_log_2_host(struct mt792x_dev *dev, u8 ctrl)
        return ret;
 }
 
+int mt7925_mcu_get_temperature(struct mt792x_phy *phy)
+{
+       struct {
+               u8 _rsv[4];
+
+               __le16 tag;
+               __le16 len;
+               u8 _rsv2[4];
+       } __packed req = {
+               .tag = cpu_to_le16(0x0),
+               .len = cpu_to_le16(sizeof(req) - 4),
+       };
+       struct mt7925_thermal_evt {
+               u8 rsv[4];
+               __le32 temperature;
+       } __packed * evt;
+       struct mt792x_dev *dev = phy->dev;
+       int temperature, ret;
+       struct sk_buff *skb;
+
+       ret = mt76_mcu_send_and_get_msg(&dev->mt76,
+                                       MCU_WM_UNI_CMD_QUERY(THERMAL),
+                                       &req, sizeof(req), true, &skb);
+       if (ret)
+               return ret;
+
+       skb_pull(skb, 4 + sizeof(struct tlv));
+       evt = (struct mt7925_thermal_evt *)skb->data;
+
+       temperature = le32_to_cpu(evt->temperature);
+
+       dev_kfree_skb(skb);
+
+       return temperature;
+}
+
 static void
 mt7925_mcu_parse_phy_cap(struct mt792x_dev *dev, char *data)
 {

diff --git a/drivers/net/wireless/mediatek/mt76/mt7925/mt7925.h b/drivers/net/wireless/mediatek/mt76/mt7925/mt7925.h
index 33785f526acff17b6411c10b66b9e462019dcee5..8a4a71f6bcb6d0e1ecc5d749b96257466c363eef 100644 (file)
--- a/drivers/net/wireless/mediatek/mt76/mt7925/mt7925.h
+++ b/drivers/net/wireless/mediatek/mt76/mt7925/mt7925.h
@@ -271,6 +271,7 @@ int mt7925_mcu_set_sniffer(struct mt792x_dev *dev, struct ieee80211_vif *vif,
                           bool enable);
 int mt7925_mcu_config_sniffer(struct mt792x_vif *vif,
                              struct ieee80211_chanctx_conf *ctx);
+int mt7925_mcu_get_temperature(struct mt792x_phy *phy);
 
 int mt7925_usb_sdio_tx_prepare_skb(struct mt76_dev *mdev, void *txwi_ptr,
                                   enum mt76_txq_id qid, struct mt76_wcid *wcid,