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Add a new test for Media Device Allocator API. Media Device Allocator API to allows multiple drivers share a media device. This API solves a very common use-case for media devices where one physical device (an USB stick) provides both audio and video. When such media device exposes a standard USB Audio class, a proprietary Video class, two or more independent drivers will share a single physical USB bridge. In such cases, it is necessary to coordinate access to the shared resource. Using this API, drivers can allocate a media device with the shared struct device as the key. Once the media device is allocated by a driver, other drivers can get a reference to it. The media device is released when all the references are released. This test does a series of unbind/bind tests to make sure media device is released correctly when it is no longer is use and when the last driver releases the reference. Signed-off-by: Shuah Khan <shuah@kernel.org> Signed-off-by: Hans Verkuil <hverkuil-cisco@xs4all.nl> Signed-off-by: Mauro Carvalho Chehab <mchehab+samsung@kernel.org>
86 lines
1.9 KiB
Bash
Executable File
86 lines
1.9 KiB
Bash
Executable File
#!/bin/bash
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# SPDX-License-Identifier: GPL-2.0
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# Media Device Allocator API test script
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# Copyright (c) 2019 Shuah Khan <shuah@kernel.org>
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echo "Media Device Allocator testing: unbind and bind"
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echo "media driver $1 audio driver $2"
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MDRIVER=/sys/bus/usb/drivers/$1
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cd $MDRIVER
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MDEV=$(ls -d *\-*)
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ADRIVER=/sys/bus/usb/drivers/$2
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cd $ADRIVER
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ADEV=$(ls -d *\-*.1)
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echo "=================================="
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echo "Test unbind both devices - start"
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echo "Running unbind of $MDEV from $MDRIVER"
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echo $MDEV > $MDRIVER/unbind;
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echo "Media device should still be present!"
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ls -l /dev/media*
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echo "sound driver is at: $ADRIVER"
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echo "Device is: $ADEV"
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echo "Running unbind of $ADEV from $ADRIVER"
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echo $ADEV > $ADRIVER/unbind;
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echo "Media device should have been deleted!"
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ls -l /dev/media*
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echo "Test unbind both devices - end"
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echo "=================================="
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echo "Test bind both devices - start"
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echo "Running bind of $MDEV from $MDRIVER"
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echo $MDEV > $MDRIVER/bind;
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echo "Media device should be present!"
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ls -l /dev/media*
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echo "Running bind of $ADEV from $ADRIVER"
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echo $ADEV > $ADRIVER/bind;
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echo "Media device should be there!"
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ls -l /dev/media*
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echo "Test bind both devices - end"
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echo "=================================="
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echo "Test unbind $MDEV - bind $MDEV - unbind $ADEV - bind $ADEV start"
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echo "Running unbind of $MDEV from $MDRIVER"
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echo $MDEV > $MDRIVER/unbind;
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echo "Media device should be there!"
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ls -l /dev/media*
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sleep 1
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echo "Running bind of $MDEV from $MDRIVER"
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echo $MDEV > $MDRIVER/bind;
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echo "Media device should be there!"
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ls -l /dev/media*
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echo "Running unbind of $ADEV from $ADRIVER"
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echo $ADEV > $ADRIVER/unbind;
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echo "Media device should be there!"
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ls -l /dev/media*
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sleep 1
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echo "Running bind of $ADEV from $ADRIVER"
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echo $ADEV > $ADRIVER/bind;
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echo "Media device should be there!"
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ls -l /dev/media*
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echo "Test unbind $MDEV - bind $MDEV - unbind $ADEV - bind $ADEV end"
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echo "=================================="
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