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media: selftests: media_dev_allocator api test

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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>
This commit is contained in:
Shuah Khan 2019-04-01 20:40:24 -04:00 committed by Mauro Carvalho Chehab
parent 383b0e5b6e
commit bc81c1c796
1 changed files with 85 additions and 0 deletions
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85
tools/testing/selftests/media_tests/media_dev_allocator.sh Executable file
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#!/bin/bash
# SPDX-License-Identifier: GPL-2.0
# Media Device Allocator API test script
# Copyright (c) 2019 Shuah Khan <shuah@kernel.org>
echo "Media Device Allocator testing: unbind and bind"
echo "media driver $1 audio driver $2"
MDRIVER=/sys/bus/usb/drivers/$1
cd $MDRIVER
MDEV=$(ls -d *\-*)
ADRIVER=/sys/bus/usb/drivers/$2
cd $ADRIVER
ADEV=$(ls -d *\-*.1)
echo "=================================="
echo "Test unbind both devices - start"
echo "Running unbind of $MDEV from $MDRIVER"
echo $MDEV > $MDRIVER/unbind;
echo "Media device should still be present!"
ls -l /dev/media*
echo "sound driver is at: $ADRIVER"
echo "Device is: $ADEV"
echo "Running unbind of $ADEV from $ADRIVER"
echo $ADEV > $ADRIVER/unbind;
echo "Media device should have been deleted!"
ls -l /dev/media*
echo "Test unbind both devices - end"
echo "=================================="
echo "Test bind both devices - start"
echo "Running bind of $MDEV from $MDRIVER"
echo $MDEV > $MDRIVER/bind;
echo "Media device should be present!"
ls -l /dev/media*
echo "Running bind of $ADEV from $ADRIVER"
echo $ADEV > $ADRIVER/bind;
echo "Media device should be there!"
ls -l /dev/media*
echo "Test bind both devices - end"
echo "=================================="
echo "Test unbind $MDEV - bind $MDEV - unbind $ADEV - bind $ADEV start"
echo "Running unbind of $MDEV from $MDRIVER"
echo $MDEV > $MDRIVER/unbind;
echo "Media device should be there!"
ls -l /dev/media*
sleep 1
echo "Running bind of $MDEV from $MDRIVER"
echo $MDEV > $MDRIVER/bind;
echo "Media device should be there!"
ls -l /dev/media*
echo "Running unbind of $ADEV from $ADRIVER"
echo $ADEV > $ADRIVER/unbind;
echo "Media device should be there!"
ls -l /dev/media*
sleep 1
echo "Running bind of $ADEV from $ADRIVER"
echo $ADEV > $ADRIVER/bind;
echo "Media device should be there!"
ls -l /dev/media*
echo "Test unbind $MDEV - bind $MDEV - unbind $ADEV - bind $ADEV end"
echo "=================================="