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8af9fa37b8
add support for Dell privacy driver for the Dell units equipped hardware privacy design, which protect users privacy of audio and camera from hardware level. Once the audio or camera privacy mode activated, any applications will not get any audio or video stream when user pressed ctrl+F4 hotkey, audio privacy mode will be enabled, micmute led will be also changed accordingly The micmute led is fully controlled by hardware & EC(embedded controller) and camera mute hotkey is Ctrl+F9. Currently design only emits SW_CAMERA_LENS_COVER event while the camera lens shutter will be changed by EC & HW(hardware) control *The flow is like this: 1) User presses key. HW does stuff with this key (timeout timer is started) 2) WMI event is emitted from BIOS to kernel 3) WMI event is received by dell-privacy 4) KEY_MICMUTE emitted from dell-privacy 5) Userland picks up key and modifies kcontrol for SW mute 6) Codec kernel driver catches and calls ledtrig_audio_set 7) dell-privacy notifies EC, the timeout is cancelled and the HW mute is activated. If the EC is not notified then the HW mic mute will activate when the timeout triggers, just a bit later than with the active ack. Signed-off-by: Perry Yuan <perry_yuan@dell.com> Link: https://lore.kernel.org/r/20210506115605.1504-1-Perry_Yuan@Dell.com [hdegoede@redhat.com: Rework Kconfig/Makefile bits + other small fixups] Reviewed-by: Hans de Goede <hdegoede@redhat.com> Signed-off-by: Hans de Goede <hdegoede@redhat.com>
56 lines
2.0 KiB
Plaintext
56 lines
2.0 KiB
Plaintext
What: /sys/bus/wmi/devices/6932965F-1671-4CEB-B988-D3AB0A901919/dell_privacy_supported_type
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Date: Apr 2021
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KernelVersion: 5.13
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Contact: "perry.yuan@dell.com>"
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Description:
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Display which dell hardware level privacy devices are supported
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“Dell Privacy” is a set of HW, FW, and SW features to enhance
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Dell’s commitment to platform privacy for MIC, Camera, and
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ePrivacy screens.
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The supported hardware privacy devices are:
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Attributes:
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Microphone Mute:
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Identifies the local microphone can be muted by hardware, no applications
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is available to capture system mic sound
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Camera Shutter:
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Identifies camera shutter controlled by hardware, which is a micromechanical
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shutter assembly that is built onto the camera module to block capturing images
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from outside the laptop
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supported:
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The privacy device is supported by this system
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unsupported:
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The privacy device is not supported on this system
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For example to check which privacy devices are supported:
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# cat /sys/bus/wmi/drivers/dell-privacy/6932965F-1671-4CEB-B988-D3AB0A901919/dell_privacy_supported_type
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[Microphone Mute] [supported]
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[Camera Shutter] [supported]
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[ePrivacy Screen] [unsupported]
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What: /sys/bus/wmi/devices/6932965F-1671-4CEB-B988-D3AB0A901919/dell_privacy_current_state
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Date: Apr 2021
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KernelVersion: 5.13
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Contact: "perry.yuan@dell.com>"
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Description:
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Allow user space to check current dell privacy device state.
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Describes the Device State class exposed by BIOS which can be
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consumed by various applications interested in knowing the Privacy
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feature capabilities
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Attributes:
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muted:
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Identifies the privacy device is turned off and cannot send stream to OS applications
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unmuted:
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Identifies the privacy device is turned on ,audio or camera driver can get
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stream from mic and camera module to OS applications
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For example to check all supported current privacy device states:
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# cat /sys/bus/wmi/drivers/dell-privacy/6932965F-1671-4CEB-B988-D3AB0A901919/dell_privacy_current_state
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[Microphone] [unmuted]
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[Camera Shutter] [unmuted]
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