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Kernel/Audio: Simplify initialization sequence for drivers
Instead of enumerating all available controllers and then ask each to find its audio channels, we change the initialization sequence to match what happens in the Networking subsystem and Graphics subsystem - we essentially probe for a matching driver on a PCI device, create a device instance, and immediately initialize it. This in fact allows us to immediately find any hardware initialization issues and report it, and then dropping the created instance, as usually being done in other initialization paths in the Kernel. This also opens the opportunity to propagate errors when failed to initialize an AudioChannel instance, and it will be addressed in a future commit.
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7 changed files with 77 additions and 72 deletions
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@ -33,13 +33,13 @@ public:
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virtual LockRefPtr<AudioChannel> audio_channel(u32 index) const = 0;
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virtual ErrorOr<size_t> write(size_t channel_index, UserOrKernelBuffer const& data, size_t length) = 0;
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virtual void detect_hardware_audio_channels(Badge<AudioManagement>) = 0;
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virtual ErrorOr<void> initialize(Badge<AudioManagement>) = 0;
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virtual ErrorOr<void> set_pcm_output_sample_rate(size_t channel_index, u32 samples_per_second_rate) = 0;
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// Note: The return value is rate of samples per second
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virtual ErrorOr<u32> get_pcm_output_sample_rate(size_t channel_index) = 0;
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private:
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IntrusiveListNode<AudioController, LockRefPtr<AudioController>> m_node;
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IntrusiveListNode<AudioController, NonnullRefPtr<AudioController>> m_node;
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};
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}
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