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Kernel/USB: Add driver search on device plug

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When a device is plugged into the machine (and hence, when
`Device::try_create()` is called), then we attempt to load a driver by
calling that driver's probe function.
This commit is contained in:
Jesse Buhagiar 2023-09-15 12:34:44 +02:00 • committed by Andrew Kaster
parent b0ed126538
commit b4cd354bae
1 changed files with 18 additions and 1 deletions
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19
Kernel/Bus/USB/USBDevice.cpp
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@ -1,5 +1,5 @@
/*
* Copyright (c) 2021, Jesse Buhagiar <jooster669@gmail.com>
* Copyright (c) 2021-2023, Jesse Buhagiar <jooster669@gmail.com>
*
* SPDX-License-Identifier: BSD-2-Clause
*/
@ -10,6 +10,7 @@
#include <Kernel/Bus/USB/USBController.h>
#include <Kernel/Bus/USB/USBDescriptors.h>
#include <Kernel/Bus/USB/USBDevice.h>
#include <Kernel/Bus/USB/USBManagement.h>
#include <Kernel/Bus/USB/USBRequest.h>
#include <Kernel/FileSystem/SysFS/Subsystems/Bus/USB/DeviceInformation.h>
#include <Kernel/Library/StdLib.h>
@ -25,6 +26,22 @@ ErrorOr<NonnullLockRefPtr<Device>> Device::try_create(USBController const& contr
node = move(sysfs_node);
});
TRY(device->enumerate_device());
// Attempt to find a driver for this device. If one is found, we call the driver's
// "probe" function, which initialises the local state for the device driver.
// It is currently the driver's responsibility to search the configuration/interface
// and take the appropriate action.
for (auto& driver : USBManagement::the().available_drivers()) {
// FIXME: Some devices have multiple configurations, for which we may have a better driver,
// than the first we find, or we have a vendor specific driver for the device,
// so we want a prioritization mechanism here
auto result = driver->probe(device);
if (result.is_error())
continue;
dbgln_if(USB_DEBUG, "Found driver {} for device {:04x}:{:04x}!", driver->name(), device->m_vendor_id, device->m_product_id);
break;
}
return device;
}