Usb Pnp Audio Device Driver
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*Usb Pnp Audio Device Driver Mac
*Usb Pnp Audio Device Driver Windows 7
*Usb Pnp Audio Device Driver Download
*What is USB PnP Sound Device Drivers. Basically, it is a sound card device that reads the audio signal from the bit form in the waveform. And, then transmits the data into the audio form to the headphones and the speakers that we can listen to. Similarly, the USB PnP sound device is an external sound card that you can Plug and Play via the USB.
*USB PnP Audio Device - Driver Download. Vendor:. Product: USB PnP Audio Device. Hardware Class: Media. Search For More Drivers.: Go! Windows 10 32-Bit.
Usb Pnp Sound Device Download And Install; Usb Pnp Sound Device Windows 7 64 Bit; Recommended if Usb Pnp Sound Device is the only driver on your PC you wish to update. After downloading and installing Usb Pnp Sound Device, or the driver installation manager, take a few minutes to send us a report: Only registered users can upload a report.
VendorCo ProductCode USB Device - Driver Download. Vendor:. Product: VendorCo ProductCode USB Device. Hardware Class: DiskDrive. Search For More Drivers.: Go! Windows 10 32-Bit Driver.
MTP or (Media Transfer Protocol) is a set of custom extensions to the Picture Transfer Protocol (PTP) devised by Microsoft, to allow the protocol to be used for devices other than digital cameras, for example digital audio players such as MP3 players, and other portable media devices, for example portable video players.Media Transfer Protocol (commonly referred to as MTP) is part of the. The package provides the installation files for Microsoft USB Input Device Driver version 10.0.4. If the driver is already installed on your system, updating (overwrite-installing) may fix various issues, add new functions, or just upgrade to the available version. The driver must be installed below the reflector and acts as the gateway to the USB driver stack in the kernel-mode. For more information, see WinUSB. USB driver stack—a set of drivers, provided by Microsoft, that handle protocol-level communication with the USB device. For more information, see USB host-side drivers in Windows.
Stay tuned to know how to download, install, and update the USB PnP sound device driver!
After a long-haul, every bit reveals their vulnerabilities unless you take proper care of them. The proper maintenance can prevent bits get damaged. Likewise, drivers are the essence that keeps your overall system hydrated or up-to-mark. Whenever you experience the malfunctioning of peripherals, initially try to update the drivers in order to fix the issue. Because most of the time the errors occur due to outdated or broken drivers. In that case, updating the drivers can fix the issue. So as on, today, we are going to explain to you how you can update the USB PnP sound device driver Windows 10.
Prior to this, you may have heard about numerous ways to update sound device drivers, which may be a bit tricky to implement. So, after going through the below-mentioned methods we guarantee you they will become your all-time bet. Before stepping forward, we want to explain to you a bit about the USB PnP Sound Device. What is USB PnP Sound Device Drivers
Basically, it is a sound card device that reads the audio signal from the bit form in the waveform. And, then transmits the data into the audio form to the headphones and the speakers that we can listen to. Similarly, the USB PnP sound device is an external sound card that you can Plug and Play via the USB ports.
Moreover, it is very beneficial to use an external sound card device as they are easy-to-install and use. Apart from this, you can connect these devices to your home theatre too. Comes with the in-built recording facility as well. So, now you are familiar with the benefits of using external sound card devices. Then, move one more step forward to know how to download the USB PnP sound device driver quite easily. Try the Best Methods to Download USB PnP Sound Device Drivers on Windows 10
There are two ways to download, install, and update the USB PnP sound device driver on Windows 10. Have a look at them!Method 1: Manually Download & Update USB PnP Sound Device Driver
There are two approaches that you can use to update drivers and which are either manually or automatically. Manually you can update the USB PnP sound device driver via the official website of the manufacturer. Or, from the official website of the external sound card device producer or you can visit Microsoft’s official site too. Well, for this you must have pretty well knowledge about tech skills. So, to implement this method travel with the below-listed steps!
Step 1:- Go to the official website of the manufacturer.
Step 2:- Then, search for the model of the sound card driver which is compatible with your Windows OS as well.
Step 3:- After this, run the setup file to install the new updates.
Tip:- Do not forget to give the User Access Control permission to the setup file.
Lastly, follow the on-screen instructions to finish the task. Later on, restart your PC to validate the new changes.
Read Also: Microsoft USB Driver Updates Completely Free For Windows 10, 8, 7Method 2: Automatically Download & Install USB PnP Sound Device Drivers on Windows (Recommended)
If you are a person who doesn’t know about every bit of the techy things then you might find it challenging to update sound card drivers via a manual approach. In that case, you can use the driver updater tool to do this task with full ease. There are numerous driver updater tools available but only a few of them prove themselves efficient. Among those efficient driver updater tools, Bit Driver Updater is the one that bags the applauds from everyone. Millions of users across the world have shown their faith in Bit Driver Updater. Bit Driver Updater is the flexible driver updater tool that fixes the Windows related issues as well, along with updating drivers. Using Bit Driver Updater is a matter of time. String with the below-listed steps to use Bit Driver Updater.Free Download For Usb Driver For Device
Step 1:- Download the Bit Driver Updater and launch it.
Step 2:- Once you’d triggered the Bit Driver Updater then, it will automatically start the scanning procedure, during the entire procedure you have to wait until it executes.
Step 3:- After this, it’ll develop the list of the outdated drivers, you’ll require to review the list carefully.
Step 4:- That’s it! Now click on the Update Now option to move further.Device Driver For Usb Camera
Read More: How to Create a Bootable USB Drive for Windows 10
Within four steps you can easily download USB PnP sound device driver using the Bit Driver Updater. Moreover, with Bit Driver Updater, you can also update all the drivers within a click. For this, you need to click on the Update All option instead of Update Now. Sounds extremely ultimate! Isn’t it? Of course, so what are you looking for now? Hit the below download link button to install the Bit Driver Updater tool now!Download USB PnP Sound Device Drivers on Windows 10 [Done Successfully]
As we all know using external sound cards is very beneficial. But, do you know to maintain its stability it is even more crucial to keep its drivers up-to-date. Through this write-up, we’ve illustrated how you can easily download USB PnP sound device driver on Windows 10. And, if you are looking for our view on this, then we would like to suggest you use Bit Driver Updater. Because it is fast and easy to execute. Do share your views on this through the comment box below. Do subscribe to our Newsletter to stay informed. Stay tuned with us!
-->
This section describes the sequence of events that occur when the system configures a PnP device that a user has added to a running machine. This discussion highlights the roles of the PnP manager, bus drivers, and function and filter drivers in enumerating and configuring a new device.
Most of this discussion is also relevant to configuring a PnP device that is present when the machine is booted. Specifically, devices whose drivers are marked SERVICE_DEMAND_START in an INF file are configured in essentially the same way whether the device is added dynamically or is present at boot time.
The following figure shows the first steps in configuring the device, starting from when the user plugs the hardware into the machine.
The following notes correspond to the circled numbers in the previous figure:
*
A user plugs a PnP device into a free slot on a PnP bus.
In this example, the user plugs a PnP USB joystick into the hub on a USB host controller. The USB hub is a PnP bus device because child devices can be attached to it.
*
The function driver for the bus device determines that a new device is on its bus.
How the driver determines this depends on the bus architecture. For some buses, the bus function driver receives hot-plug notification of new devices. If the bus does not support hot-plug notification, the user must take appropriate action in Control Panel to cause the bus to be enumerated.
In this example, the USB bus supports hot-plug notification so the function driver for the USB bus is notified that its children have changed.
*
The function driver for the bus device notifies the PnP manager that its set of child devices has changed.
The function driver notifies the PnP manager by calling IoInvalidateDeviceRelations with a Type of BusRelations.
*
The PnP manager queries the bus’s drivers for the current list of devices on the bus.
The PnP manager sends an IRP_MN_QUERY_DEVICE_RELATIONS request to the device stack for the bus. The Parameters.QueryDeviceRelations.Type value is BusRelations, indicating that the PnP manager is asking for the current list of devices present on the bus (bus relations).
The PnP manager sends the IRP to the top driver in the device stack for the bus. According to the rules for PnP IRPs, each driver in the stack handles the IRP, if appropriate, and passes the IRP down to the next driver.
*
The function driver for the bus device handles the IRP.
See the reference page for IRP_MN_QUERY_DEVICE_RELATIONS for detailed information about handling this IRP.
In this example, the USB hub driver handles this IRP for the hub FDO. The hub driver creates a PDO for the joystick device and includes a referenced pointer to the joystick PDO in its list of child devices returned with the IRP.
When the USB hub’s parent bus driver (the USB host controller class/miniclass driver pair) completes the IRP, the IRP travels back up the device stack by means of any IoCompletion routines registered by the hub drivers.
Note that the bus function driver reports a change in its list of children by requesting that the PnP manager query for its list of child devices. The resulting IRP_MN_QUERY_DEVICE_RELATIONS request is seen by all the drivers for the bus device. Typically, the bus function driver is the only driver to handle the IRP and report children. In some device stacks, a bus filter driver is present and participates in constructing the list of bus relations. One example is ACPI, which attaches as a bus filter driver for ACPI devices. In some device stacks, nonbus filter drivers handle the IRP_MN_QUERY_DEVICE_RELATIONS request, but this is not typical.
At this point, the PnP manager has the current list of devices on the bus. The PnP manager then determines whether any devices are newly arrived or have been removed. In this example, there is one new device. The following figure shows the PnP manager creating a devnode for the new device and beginning to configure the device.Usb Pnp Audio Device Driver Mac
The following notes correspond to the circled numbers in the previous figure:
*
The PnP manager creates devnodes for any new child devices on the bus.
The PnP manager compares the list of bus relations returned in the IRP_MN_QUERY_DEVICE_RELATIONS IRP to the list of children for the bus currently recorded in the PnP device tree. The PnP manager creates a devnode for each new device and initiates removal processing for any devices that have been removed.
In this example, there is one new device (a joystick), so the PnP manager creates a devnode for the joystick. At this point, the only driver that is configured for the joystick is the parent USB hub bus driver, which created the joystick’s PDO. Any optional bus filter drivers would also be present in the device stack, but the example omits bus filter drivers for simplicity.
The wide arrow between the two devnodes in the previous figure indicates that the joystick devnode is a child of the USB hub devnode.
*
The PnP manager gathers information about the new device and begins configuring the device.
The PnP manager sends a sequence of IRPs to the device stack to gather information about the device. At this point, the device stack consists of only the PDO created by the device’s parent bus driver and filter DOs for any optional bus filter drivers. Therefore, the bus driver and bus filter drivers are the only drivers that respond to these IRPs. In this example, the only driver in the joystick device stack is the parent bus driver, the USB hub driver.
The PnP manager gathers information about a new device by sending IRPs to the device stack. These IRPs include the following:
*
IRP_MN_QUERY_ID, a separate IRP for each of the following types of hardware IDs:
BusQueryDeviceID
BusQueryInstanceID
BusQueryHardwareIDs
BusQueryCompatibleIDs
BusQueryContainerID
*
IRP_MN_QUERY_DEVICE_TEXT, a separate IRP for each of the following items:
DeviceTextDescription
DeviceTextLocationInformation
The PnP manager sends the IRPs listed above at this stage of processing a new PnP device, but not necessarily in the order listed, so you should not make assumptions about the order in which the IRPs are sent. Also, you should not assume that the PnP manager sends only the IRPs listed above.
The PnP manager checks the registry to determine whether the device has been installed on this machine previously. The PnP manager checks for an <enumerator><deviceID> subkey for the device under the Enum branch. In this example, the device is new and must be configured ’from scratch.’
*
The PnP manager stores information about the device in the registry.
The registry’s Enum branch is reserved for use by operating system components and its layout is subject to change. Driver writers must use system routines to extract information related to drivers. Do not access the Enum branch directly from a driver. The following Enum information is listed for debugging purposes only.
*
The PnP manager creates a subkey for the device under the key for the device’s enumerator.
The PnP manager creates a subkey named HKLMSystemCurrentControlSetEnum<enumerator><deviceID>. It creates the <enumerator> subkey if it does not already exist.
An enumerator is a component that discovers PnP devices based on a PnP hardware standard. The tasks of an enumerator are carried out by a PnP bus driver in partnership with the PnP manager. A device is typically enumerated by its parent bus driver, such as PCI or PCMCIA. Some devices are enumerated by a bus filter driver, such as ACPI.
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The PnP manager creates a subkey for this instance of the device.
If Capabilities.UniqueID is returned as TRUE for IRP_MN_QUERY_CAPABILITIES, the device’s unique ID is unique across the system. If not, the PnP manager modifies the ID so that it is unique system-wide.
The PnP manager creates a subkey named HKLMSystemCurrentControlSetEnum<enumerator><deviceID><instanceID>.
*
The PnP manager writes information about the device to the subkey for the device instance.
The PnP manager stores information, including the following, if it was supplied for the device:
DeviceDesc — from IRP_MN_QUERY_DEVICE_TEXT
Location — from IRP_MN_QUERY_DEVICE_TEXT
Capabilities — the flags from IRP_MN_QUERY_CAPABILITIES
UINumber — from IRP_MN_QUERY_CAPABILITIES
HardwareID — from IRP_MN_QUERY_ID
CompatibleIDs — from IRP_MN_QUERY_ID
ContainerID — from IRP_MN_QUERY_ID
LogConfBootConfig — from IRP_MN_QUERY_RESOURCES
LogConfBasicConfigVector — from IRP_MN_QUERY_RESOURCE_REQUIREMENTSUsb Pnp Audio Device Driver Windows 7
At this point, the PnP manager is ready to locate the function driver and filter drivers for the device, if any. (See the following figure.)
The following notes correspond to the numbered circles in the previous figure:
*
The kernel-mode PnP manager coordinates with the user-mode PnP manager and user-mode Setup components to find the function and filter drivers for the device, if there are any.
The kernel-mode PnP manager queues an event to the user-mode PnP manager, identifying a device that needs to be installed. Once a privileged user logs in, the user-mode components proceed with finding drivers. See the device installation overview For information about Setup components and their role in installing a device.
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The user-mode Setup components direct the kernel-mode PnP manager to load the function and filter drivers.
The user-mode components call back to kernel mode to get the drivers loaded, causing their AddDevice routines to be called.
The following figure shows the PnP manager loading the drivers (if appropriate), calling their AddDevice routines, and directing the drivers to start the device.
The following notes correspond to the numbered circles in the previous figure:
*
Lower-filter drivers
Before the function driver attaches to the device stack, the PnP manager processes any lower-filter drivers. For each lower-filter driver, the PnP manager calls the driver’s DriverEntry routine if the driver is not yet loaded. Then the PnP manager calls the driver’s AddDevice routine. In its AddDevice routine, the filter driver creates a filter device object (filter DO) and attaches it to the device stack (IoAttachDeviceToDeviceStack). Once it attaches its device object to the device stack, the driver is engaged as a driver for the device.
In the USB joystick example, there is one lower-filter driver for the device.
*
Function driver
After any lower filters are attached, the PnP manager processes the function driver. The PnP manager calls the function driver’s DriverEntry routine if the driver is not yet loaded and calls the function driver’s AddDevice routine. The function driver creates a function device object (FDO) and attaches it to the device stack.
In this example, the function driver for the USB joystick is actually a pair of drivers: the HID class driver and the HID miniclass driver. The two drivers work together to serve as the function driver. The driver pair creates only one FDO and attaches it to the device stack.
*
Upper-filter drivers
After the function driver is attached, the PnP manager processes any upper-filter drivers.
In this example, there is one upper-filter driver for the device.
*
Assigning resources and starting the device
The PnP manager assigns resources to the device, if needed, and issues an IRP t
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*Usb Pnp Audio Device Driver Mac
*Usb Pnp Audio Device Driver Windows 7
*Usb Pnp Audio Device Driver Download
*What is USB PnP Sound Device Drivers. Basically, it is a sound card device that reads the audio signal from the bit form in the waveform. And, then transmits the data into the audio form to the headphones and the speakers that we can listen to. Similarly, the USB PnP sound device is an external sound card that you can Plug and Play via the USB.
*USB PnP Audio Device - Driver Download. Vendor:. Product: USB PnP Audio Device. Hardware Class: Media. Search For More Drivers.: Go! Windows 10 32-Bit.
Usb Pnp Sound Device Download And Install; Usb Pnp Sound Device Windows 7 64 Bit; Recommended if Usb Pnp Sound Device is the only driver on your PC you wish to update. After downloading and installing Usb Pnp Sound Device, or the driver installation manager, take a few minutes to send us a report: Only registered users can upload a report.
VendorCo ProductCode USB Device - Driver Download. Vendor:. Product: VendorCo ProductCode USB Device. Hardware Class: DiskDrive. Search For More Drivers.: Go! Windows 10 32-Bit Driver.
MTP or (Media Transfer Protocol) is a set of custom extensions to the Picture Transfer Protocol (PTP) devised by Microsoft, to allow the protocol to be used for devices other than digital cameras, for example digital audio players such as MP3 players, and other portable media devices, for example portable video players.Media Transfer Protocol (commonly referred to as MTP) is part of the. The package provides the installation files for Microsoft USB Input Device Driver version 10.0.4. If the driver is already installed on your system, updating (overwrite-installing) may fix various issues, add new functions, or just upgrade to the available version. The driver must be installed below the reflector and acts as the gateway to the USB driver stack in the kernel-mode. For more information, see WinUSB. USB driver stack—a set of drivers, provided by Microsoft, that handle protocol-level communication with the USB device. For more information, see USB host-side drivers in Windows.
Stay tuned to know how to download, install, and update the USB PnP sound device driver!
After a long-haul, every bit reveals their vulnerabilities unless you take proper care of them. The proper maintenance can prevent bits get damaged. Likewise, drivers are the essence that keeps your overall system hydrated or up-to-mark. Whenever you experience the malfunctioning of peripherals, initially try to update the drivers in order to fix the issue. Because most of the time the errors occur due to outdated or broken drivers. In that case, updating the drivers can fix the issue. So as on, today, we are going to explain to you how you can update the USB PnP sound device driver Windows 10.
Prior to this, you may have heard about numerous ways to update sound device drivers, which may be a bit tricky to implement. So, after going through the below-mentioned methods we guarantee you they will become your all-time bet. Before stepping forward, we want to explain to you a bit about the USB PnP Sound Device. What is USB PnP Sound Device Drivers
Basically, it is a sound card device that reads the audio signal from the bit form in the waveform. And, then transmits the data into the audio form to the headphones and the speakers that we can listen to. Similarly, the USB PnP sound device is an external sound card that you can Plug and Play via the USB ports.
Moreover, it is very beneficial to use an external sound card device as they are easy-to-install and use. Apart from this, you can connect these devices to your home theatre too. Comes with the in-built recording facility as well. So, now you are familiar with the benefits of using external sound card devices. Then, move one more step forward to know how to download the USB PnP sound device driver quite easily. Try the Best Methods to Download USB PnP Sound Device Drivers on Windows 10
There are two ways to download, install, and update the USB PnP sound device driver on Windows 10. Have a look at them!Method 1: Manually Download & Update USB PnP Sound Device Driver
There are two approaches that you can use to update drivers and which are either manually or automatically. Manually you can update the USB PnP sound device driver via the official website of the manufacturer. Or, from the official website of the external sound card device producer or you can visit Microsoft’s official site too. Well, for this you must have pretty well knowledge about tech skills. So, to implement this method travel with the below-listed steps!
Step 1:- Go to the official website of the manufacturer.
Step 2:- Then, search for the model of the sound card driver which is compatible with your Windows OS as well.
Step 3:- After this, run the setup file to install the new updates.
Tip:- Do not forget to give the User Access Control permission to the setup file.
Lastly, follow the on-screen instructions to finish the task. Later on, restart your PC to validate the new changes.
Read Also: Microsoft USB Driver Updates Completely Free For Windows 10, 8, 7Method 2: Automatically Download & Install USB PnP Sound Device Drivers on Windows (Recommended)
If you are a person who doesn’t know about every bit of the techy things then you might find it challenging to update sound card drivers via a manual approach. In that case, you can use the driver updater tool to do this task with full ease. There are numerous driver updater tools available but only a few of them prove themselves efficient. Among those efficient driver updater tools, Bit Driver Updater is the one that bags the applauds from everyone. Millions of users across the world have shown their faith in Bit Driver Updater. Bit Driver Updater is the flexible driver updater tool that fixes the Windows related issues as well, along with updating drivers. Using Bit Driver Updater is a matter of time. String with the below-listed steps to use Bit Driver Updater.Free Download For Usb Driver For Device
Step 1:- Download the Bit Driver Updater and launch it.
Step 2:- Once you’d triggered the Bit Driver Updater then, it will automatically start the scanning procedure, during the entire procedure you have to wait until it executes.
Step 3:- After this, it’ll develop the list of the outdated drivers, you’ll require to review the list carefully.
Step 4:- That’s it! Now click on the Update Now option to move further.Device Driver For Usb Camera
Read More: How to Create a Bootable USB Drive for Windows 10
Within four steps you can easily download USB PnP sound device driver using the Bit Driver Updater. Moreover, with Bit Driver Updater, you can also update all the drivers within a click. For this, you need to click on the Update All option instead of Update Now. Sounds extremely ultimate! Isn’t it? Of course, so what are you looking for now? Hit the below download link button to install the Bit Driver Updater tool now!Download USB PnP Sound Device Drivers on Windows 10 [Done Successfully]
As we all know using external sound cards is very beneficial. But, do you know to maintain its stability it is even more crucial to keep its drivers up-to-date. Through this write-up, we’ve illustrated how you can easily download USB PnP sound device driver on Windows 10. And, if you are looking for our view on this, then we would like to suggest you use Bit Driver Updater. Because it is fast and easy to execute. Do share your views on this through the comment box below. Do subscribe to our Newsletter to stay informed. Stay tuned with us!
-->
This section describes the sequence of events that occur when the system configures a PnP device that a user has added to a running machine. This discussion highlights the roles of the PnP manager, bus drivers, and function and filter drivers in enumerating and configuring a new device.
Most of this discussion is also relevant to configuring a PnP device that is present when the machine is booted. Specifically, devices whose drivers are marked SERVICE_DEMAND_START in an INF file are configured in essentially the same way whether the device is added dynamically or is present at boot time.
The following figure shows the first steps in configuring the device, starting from when the user plugs the hardware into the machine.
The following notes correspond to the circled numbers in the previous figure:
*
A user plugs a PnP device into a free slot on a PnP bus.
In this example, the user plugs a PnP USB joystick into the hub on a USB host controller. The USB hub is a PnP bus device because child devices can be attached to it.
*
The function driver for the bus device determines that a new device is on its bus.
How the driver determines this depends on the bus architecture. For some buses, the bus function driver receives hot-plug notification of new devices. If the bus does not support hot-plug notification, the user must take appropriate action in Control Panel to cause the bus to be enumerated.
In this example, the USB bus supports hot-plug notification so the function driver for the USB bus is notified that its children have changed.
*
The function driver for the bus device notifies the PnP manager that its set of child devices has changed.
The function driver notifies the PnP manager by calling IoInvalidateDeviceRelations with a Type of BusRelations.
*
The PnP manager queries the bus’s drivers for the current list of devices on the bus.
The PnP manager sends an IRP_MN_QUERY_DEVICE_RELATIONS request to the device stack for the bus. The Parameters.QueryDeviceRelations.Type value is BusRelations, indicating that the PnP manager is asking for the current list of devices present on the bus (bus relations).
The PnP manager sends the IRP to the top driver in the device stack for the bus. According to the rules for PnP IRPs, each driver in the stack handles the IRP, if appropriate, and passes the IRP down to the next driver.
*
The function driver for the bus device handles the IRP.
See the reference page for IRP_MN_QUERY_DEVICE_RELATIONS for detailed information about handling this IRP.
In this example, the USB hub driver handles this IRP for the hub FDO. The hub driver creates a PDO for the joystick device and includes a referenced pointer to the joystick PDO in its list of child devices returned with the IRP.
When the USB hub’s parent bus driver (the USB host controller class/miniclass driver pair) completes the IRP, the IRP travels back up the device stack by means of any IoCompletion routines registered by the hub drivers.
Note that the bus function driver reports a change in its list of children by requesting that the PnP manager query for its list of child devices. The resulting IRP_MN_QUERY_DEVICE_RELATIONS request is seen by all the drivers for the bus device. Typically, the bus function driver is the only driver to handle the IRP and report children. In some device stacks, a bus filter driver is present and participates in constructing the list of bus relations. One example is ACPI, which attaches as a bus filter driver for ACPI devices. In some device stacks, nonbus filter drivers handle the IRP_MN_QUERY_DEVICE_RELATIONS request, but this is not typical.
At this point, the PnP manager has the current list of devices on the bus. The PnP manager then determines whether any devices are newly arrived or have been removed. In this example, there is one new device. The following figure shows the PnP manager creating a devnode for the new device and beginning to configure the device.Usb Pnp Audio Device Driver Mac
The following notes correspond to the circled numbers in the previous figure:
*
The PnP manager creates devnodes for any new child devices on the bus.
The PnP manager compares the list of bus relations returned in the IRP_MN_QUERY_DEVICE_RELATIONS IRP to the list of children for the bus currently recorded in the PnP device tree. The PnP manager creates a devnode for each new device and initiates removal processing for any devices that have been removed.
In this example, there is one new device (a joystick), so the PnP manager creates a devnode for the joystick. At this point, the only driver that is configured for the joystick is the parent USB hub bus driver, which created the joystick’s PDO. Any optional bus filter drivers would also be present in the device stack, but the example omits bus filter drivers for simplicity.
The wide arrow between the two devnodes in the previous figure indicates that the joystick devnode is a child of the USB hub devnode.
*
The PnP manager gathers information about the new device and begins configuring the device.
The PnP manager sends a sequence of IRPs to the device stack to gather information about the device. At this point, the device stack consists of only the PDO created by the device’s parent bus driver and filter DOs for any optional bus filter drivers. Therefore, the bus driver and bus filter drivers are the only drivers that respond to these IRPs. In this example, the only driver in the joystick device stack is the parent bus driver, the USB hub driver.
The PnP manager gathers information about a new device by sending IRPs to the device stack. These IRPs include the following:
*
IRP_MN_QUERY_ID, a separate IRP for each of the following types of hardware IDs:
BusQueryDeviceID
BusQueryInstanceID
BusQueryHardwareIDs
BusQueryCompatibleIDs
BusQueryContainerID
*
IRP_MN_QUERY_DEVICE_TEXT, a separate IRP for each of the following items:
DeviceTextDescription
DeviceTextLocationInformation
The PnP manager sends the IRPs listed above at this stage of processing a new PnP device, but not necessarily in the order listed, so you should not make assumptions about the order in which the IRPs are sent. Also, you should not assume that the PnP manager sends only the IRPs listed above.
The PnP manager checks the registry to determine whether the device has been installed on this machine previously. The PnP manager checks for an <enumerator><deviceID> subkey for the device under the Enum branch. In this example, the device is new and must be configured ’from scratch.’
*
The PnP manager stores information about the device in the registry.
The registry’s Enum branch is reserved for use by operating system components and its layout is subject to change. Driver writers must use system routines to extract information related to drivers. Do not access the Enum branch directly from a driver. The following Enum information is listed for debugging purposes only.
*
The PnP manager creates a subkey for the device under the key for the device’s enumerator.
The PnP manager creates a subkey named HKLMSystemCurrentControlSetEnum<enumerator><deviceID>. It creates the <enumerator> subkey if it does not already exist.
An enumerator is a component that discovers PnP devices based on a PnP hardware standard. The tasks of an enumerator are carried out by a PnP bus driver in partnership with the PnP manager. A device is typically enumerated by its parent bus driver, such as PCI or PCMCIA. Some devices are enumerated by a bus filter driver, such as ACPI.
*
The PnP manager creates a subkey for this instance of the device.
If Capabilities.UniqueID is returned as TRUE for IRP_MN_QUERY_CAPABILITIES, the device’s unique ID is unique across the system. If not, the PnP manager modifies the ID so that it is unique system-wide.
The PnP manager creates a subkey named HKLMSystemCurrentControlSetEnum<enumerator><deviceID><instanceID>.
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The PnP manager writes information about the device to the subkey for the device instance.
The PnP manager stores information, including the following, if it was supplied for the device:
DeviceDesc — from IRP_MN_QUERY_DEVICE_TEXT
Location — from IRP_MN_QUERY_DEVICE_TEXT
Capabilities — the flags from IRP_MN_QUERY_CAPABILITIES
UINumber — from IRP_MN_QUERY_CAPABILITIES
HardwareID — from IRP_MN_QUERY_ID
CompatibleIDs — from IRP_MN_QUERY_ID
ContainerID — from IRP_MN_QUERY_ID
LogConfBootConfig — from IRP_MN_QUERY_RESOURCES
LogConfBasicConfigVector — from IRP_MN_QUERY_RESOURCE_REQUIREMENTSUsb Pnp Audio Device Driver Windows 7
At this point, the PnP manager is ready to locate the function driver and filter drivers for the device, if any. (See the following figure.)
The following notes correspond to the numbered circles in the previous figure:
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The kernel-mode PnP manager coordinates with the user-mode PnP manager and user-mode Setup components to find the function and filter drivers for the device, if there are any.
The kernel-mode PnP manager queues an event to the user-mode PnP manager, identifying a device that needs to be installed. Once a privileged user logs in, the user-mode components proceed with finding drivers. See the device installation overview For information about Setup components and their role in installing a device.
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The user-mode Setup components direct the kernel-mode PnP manager to load the function and filter drivers.
The user-mode components call back to kernel mode to get the drivers loaded, causing their AddDevice routines to be called.
The following figure shows the PnP manager loading the drivers (if appropriate), calling their AddDevice routines, and directing the drivers to start the device.
The following notes correspond to the numbered circles in the previous figure:
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Lower-filter drivers
Before the function driver attaches to the device stack, the PnP manager processes any lower-filter drivers. For each lower-filter driver, the PnP manager calls the driver’s DriverEntry routine if the driver is not yet loaded. Then the PnP manager calls the driver’s AddDevice routine. In its AddDevice routine, the filter driver creates a filter device object (filter DO) and attaches it to the device stack (IoAttachDeviceToDeviceStack). Once it attaches its device object to the device stack, the driver is engaged as a driver for the device.
In the USB joystick example, there is one lower-filter driver for the device.
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Function driver
After any lower filters are attached, the PnP manager processes the function driver. The PnP manager calls the function driver’s DriverEntry routine if the driver is not yet loaded and calls the function driver’s AddDevice routine. The function driver creates a function device object (FDO) and attaches it to the device stack.
In this example, the function driver for the USB joystick is actually a pair of drivers: the HID class driver and the HID miniclass driver. The two drivers work together to serve as the function driver. The driver pair creates only one FDO and attaches it to the device stack.
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Upper-filter drivers
After the function driver is attached, the PnP manager processes any upper-filter drivers.
In this example, there is one upper-filter driver for the device.
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Assigning resources and starting the device
The PnP manager assigns resources to the device, if needed, and issues an IRP t
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