mirror of https://github.com/pikvm/pikvm
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Maxim Devaev
10 months ago
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# Dynamic USB configuration
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PiKVM emulates a number of USB devices to ensure normal operation: keyboards, mouse and mass storage drive.
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Also an additional [relative mouse](mouse.md) may be present (like on PiKVM V4 by default),
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or a user configured [USB Ethernet](usb_ethernet.md) or [Serial port](usb_serial.md).
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In rare cases, the host BIOS/UEFI may not understand such a large number of emulated devices on single USB port,
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so some of them may need to be disabled. USB reconfiguration usually requires a reboot, but it is possible
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to temporarily disable already configured existing emulated devices.
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!!! warning
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This feature is experimental. Due to the imperfections of the kernel modules, rarely a dynamic configuration change
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can lead to a kernel panic and reboot.
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For PiKVM V3 and V4 this is considered more secure because they have two independent watchdog systems
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that can bring devices back to life after a timeout of a few minutes.
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## Command-line utility
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The `kvmd-otgconf` utility allows you to view and modify the USB configuration on the fly.
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It requires root permission and can be used for example from a web terminal.
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View the config:
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```
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# kvmd-otgconf
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+ hid.usb0 # Keyboard
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+ hid.usb1 # Absolute Mouse
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+ hid.usb2 # Relative Mouse
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+ mass_storage.usb0 # Mass Storage Drive
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```
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Each line represents a device (function). First comes plus or minus sign (the device on or off), then the name of the device and its description.
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Disabling the device:
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```
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[root@pikvm ~]# kvmd-otgconf --disable-function mass_storage.usb0
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+ hid.usb0 # Keyboard
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+ hid.usb1 # Absolute Mouse
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+ hid.usb2 # Relative Mouse
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- mass_storage.usb0 # Mass Storage Drive
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```
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Enabling the device:
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```
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[root@pikvm ~]# kvmd-otgconf --enable-function mass_storage.usb0
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+ hid.usb0 # Keyboard
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+ hid.usb1 # Absolute Mouse
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+ hid.usb2 # Relative Mouse
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+ mass_storage.usb0 # Mass Storage Drive
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```
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## Web UI menu
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Using the pseudo-GPIO driver, you can also control devices via the menu in the web interface.
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Read about GPIO basics [here](gpio.md).
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To setup the menu, use `kvmd-otgconf` to generate the configuration, and combine it
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with your existing one in `/etc/kvmd/override.yaml` in a usual way.
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```yaml
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# kvmd-otgconf --make-gpio-config
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kvmd:
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gpio:
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drivers:
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otgconf:
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type: otgconf
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scheme:
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hid.usb0:
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driver: otgconf
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mode: output
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pin: hid.usb0
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pulse:
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delay: 0
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hid.usb1:
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driver: otgconf
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mode: output
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pin: hid.usb1
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pulse:
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delay: 0
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hid.usb2:
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driver: otgconf
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mode: output
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pin: hid.usb2
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pulse:
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delay: 0
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mass_storage.usb0:
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driver: otgconf
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mode: output
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pin: mass_storage.usb0
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pulse:
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delay: 0
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view:
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table:
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- - '#Keyboard'
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- '#hid.usb0'
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- hid.usb0
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- - '#Absolute Mouse'
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- '#hid.usb1'
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- hid.usb1
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- - '#Relative Mouse'
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- '#hid.usb2'
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- hid.usb2
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- - '#Mass Storage Drive'
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- '#mass_storage.usb0'
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- mass_storage.usb0
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```
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