RGBCube/serenity
1
Fork 0
mirror of https://github.com/RGBCube/serenity synced 2025-06-01 02:28:12 +00:00
Code Issues Activity Actions

Kernel/Devices: Introduce the Device Control Device

Browse source 
This device will assist userspace to manage hotplug events.
A userspace application reads a DeviceEvent entry until the return value
is zero which indicates no events that are queued and waiting for
processing.
Trying to read with a buffer smaller than sizeof(DeviceEvent) results in
EOVERFLOW.
For now, there's no ioctl mechanism for this device but in the future an
acknowledgement mechanism can be implemented via ioctl(2) interface.
This commit is contained in:
Liav A 2021-12-20 11:10:35 +02:00 • committed by Linus Groh
parent b60e19fd34
commit b1ca39411b
7 changed files with 151 additions and 0 deletions
Download patch file Download diff file Expand all files Collapse all files

11
Kernel/Devices/DeviceManagement.h
View file

@ -13,11 +13,13 @@
#include <AK/RefPtr.h>
#include <AK/Time.h>
#include <AK/Types.h>
#include <Kernel/API/DeviceEvent.h>
#include <Kernel/API/TimePage.h>
#include <Kernel/Arch/RegisterState.h>
#include <Kernel/Devices/CharacterDevice.h>
#include <Kernel/Devices/ConsoleDevice.h>
#include <Kernel/Devices/Device.h>
#include <Kernel/Devices/DeviceControlDevice.h>
#include <Kernel/Devices/NullDevice.h>
#include <Kernel/UnixTypes.h>
@ -31,12 +33,17 @@ public:
static DeviceManagement& the();
void attach_null_device(NullDevice const&);
void attach_device_control_device(DeviceControlDevice const&);
bool is_console_device_attached() const { return !m_console_device.is_null(); }
void attach_console_device(ConsoleDevice const&);
// FIXME: Once we have a singleton for managing many sound cards, remove this from here
void attach_audio_device(CharacterDevice const&);
bool is_device_event_queue_ready_to_read() const;
Optional<DeviceEvent> dequeue_top_device_event(Badge<DeviceControlDevice>);
void after_inserting_device(Badge<Device>, Device&);
void before_device_removal(Badge<Device>, Device&);
@ -60,9 +67,13 @@ public:
private:
RefPtr<NullDevice> m_null_device;
RefPtr<ConsoleDevice> m_console_device;
RefPtr<DeviceControlDevice> m_device_control_device;
// FIXME: Once we have a singleton for managing many sound cards, remove this from here
NonnullRefPtrVector<CharacterDevice, 1> m_audio_devices;
MutexProtected<HashMap<u64, Device*>> m_devices;
mutable Spinlock m_event_queue_lock;
CircularQueue<DeviceEvent, 100> m_event_queue;
};
}