Sysfs Reference¶

The MT7925 driver exposes interfaces through the Linux sysfs filesystem for monitoring and control.

Hardware Monitoring (hwmon)¶

The driver registers with the Linux hwmon subsystem for temperature monitoring.

Location¶

# Find the hwmon device
ls /sys/class/ieee80211/phy*/hwmon*/

# Or find by name
cat /sys/class/hwmon/hwmon*/name | grep -n mt7925

Temperature Reading¶


File	`temp1_input`
Permissions	Read-only
Unit	Millidegrees Celsius

# Read chip temperature
cat /sys/class/ieee80211/phy0/hwmon*/temp1_input
# Output: 54000 = 54.0°C

# Convert to degrees
echo "scale=1; $(cat /sys/class/ieee80211/phy0/hwmon*/temp1_input) / 1000" | bc

Integration with lm-sensors:

# Install lm-sensors
sudo pacman -S lm_sensors   # Arch
sudo apt install lm-sensors  # Debian/Ubuntu

# View temperatures
sensors

RFKill Interface¶

Controls the radio on/off state.

Location¶

/sys/class/ieee80211/phy*/rfkill*/

Entries¶

File	Description
`soft`	Software kill switch (0=on, 1=off)
`hard`	Hardware kill switch (0=on, 1=off)
`state`	Combined state (0=disabled, 1=enabled, 2=soft blocked)
`name`	Device name
`type`	Device type (wlan)

# Check rfkill status
cat /sys/class/ieee80211/phy0/rfkill*/soft
cat /sys/class/ieee80211/phy0/rfkill*/hard
cat /sys/class/ieee80211/phy0/rfkill*/state

# Using rfkill command
rfkill list wifi

Enabling/Disabling Radio:

# Using rfkill command (preferred)
sudo rfkill block wifi     # Disable WiFi
sudo rfkill unblock wifi   # Enable WiFi

# Using sysfs directly
echo 1 | sudo tee /sys/class/ieee80211/phy0/rfkill*/soft  # Block
echo 0 | sudo tee /sys/class/ieee80211/phy0/rfkill*/soft  # Unblock

IEEE80211 PHY Interface¶

Location¶

/sys/class/ieee80211/phy*/

Entries¶

File	Description
`name`	PHY name (e.g., phy0)
`index`	PHY index number
`macaddress`	Hardware MAC address
`addresses`	Supported MAC addresses

cat /sys/class/ieee80211/phy0/name
cat /sys/class/ieee80211/phy0/macaddress

Network Device Interface¶

Location¶

/sys/class/net/wlan0/

Key Entries¶

File	Description	R/W
`address`	Current MAC address	R
`operstate`	Operational state	R
`carrier`	Link carrier state	R
`mtu`	Maximum transmission unit	R/W
`statistics/`	Network statistics	R

# Check interface state
cat /sys/class/net/wlan0/operstate    # up, down, dormant
cat /sys/class/net/wlan0/carrier      # 1 = connected

# View statistics
cat /sys/class/net/wlan0/statistics/rx_packets
cat /sys/class/net/wlan0/statistics/tx_packets
cat /sys/class/net/wlan0/statistics/rx_bytes
cat /sys/class/net/wlan0/statistics/tx_bytes

PCI Device Interface¶

Location¶

Find your device:

lspci -d 14c3: | head -1
# Example: bf:00.0 Network controller: MEDIATEK Corp. MT7925

Then access:

/sys/bus/pci/devices/0000:bf:00.0/

Key Entries¶

File	Description	R/W
`device`	PCI device ID	R
`vendor`	PCI vendor ID (14c3)	R
`enable`	Device enable state	R/W
`remove`	Remove device from bus	W
`reset`	Reset device	W
`current_link_speed`	PCIe link speed	R
`current_link_width`	PCIe link width	R
`power_state`	Power state (D0-D3)	R

# Check PCIe link
cat /sys/bus/pci/devices/0000:bf:00.0/current_link_speed
cat /sys/bus/pci/devices/0000:bf:00.0/current_link_width

# Check power state
cat /sys/bus/pci/devices/0000:bf:00.0/power_state

Power Management¶

File	Description
`power/control`	Runtime PM control (auto/on)
`power/runtime_status`	Current PM status
`power/autosuspend_delay_ms`	Delay before suspend

# Check runtime PM status
cat /sys/bus/pci/devices/0000:bf:00.0/power/runtime_status

# Disable runtime PM
echo on | sudo tee /sys/bus/pci/devices/0000:bf:00.0/power/control

# Enable runtime PM
echo auto | sudo tee /sys/bus/pci/devices/0000:bf:00.0/power/control

Quick Reference Script¶

#!/bin/bash
# mt7925-sysfs-info.sh

PHY=$(iw dev | grep -m1 "phy#" | cut -d'#' -f2)
DEV=$(iw dev | grep -m1 Interface | awk '{print $2}')

echo "=== MT7925 Sysfs Info ==="
echo "PHY: phy$PHY"
echo "Interface: $DEV"
echo ""

echo "=== Temperature ==="
cat /sys/class/ieee80211/phy$PHY/hwmon*/temp1_input 2>/dev/null | awk '{printf "%.1f°C\n", $1/1000}'

echo ""
echo "=== Interface State ==="
cat /sys/class/net/$DEV/operstate

echo ""
echo "=== RFKill ==="
rfkill list wifi

echo ""
echo "=== Statistics ==="
echo "RX packets: $(cat /sys/class/net/$DEV/statistics/rx_packets)"
echo "TX packets: $(cat /sys/class/net/$DEV/statistics/tx_packets)"