i try to use the SPI Bus of my custom board threw windows 10 IoT Enterprise. I use a Intel Atom X5 E3930 CPU on a Congatec SA5 module.
i found the rhproxy driver in the system folder and checkt the boot option of it and i checked if he is running.
-> the result is the proxy is runnung but i can't find it in the device tree and my software example could not open any connection to the SPI device. The Handle of the device is still NULL
i checked the ACPI Table and could not find any entries about the rhproxy.
now my question.
how can i get the ACPI entry for rhproxy or is there any way to modify the ACPI table.
regards
If you need to provide user mode Universal Windows Platform (UWP) API access to simple buses like I2C, GPIO and SPI, you need make sure that ACPI table in your UEFI firmware contains appropriate entries for RHProxy. Please refer to user mode access for more information. You may try to create a .NET app that uses AcpiGenFx to generate ACPI tables, please refer to this document.
thanks for the answer, it was very useful for me.
now i can see my rhproxy at the device manager but i can't get access to my spi bus.
my Spi bus is connected over an PCI bus to my cpu, how do i tell the rhproxy ther will be a device.
static void Main(string[] args)
{
x86Platform platform = Platforms.Createx86Platform(
//ArmPlatform Platform = Platforms.CreateArmPlatform(
OEMID: "MSFT",
OEMTableID: "EDK2",
CreatorID: "MSFT",
Revision: 1,
FileName: "SSDT"
);
platform.SSDT = true;
var rh = platform.AddGenericDevice("RHPX", "MSFT8000", "MSFT8000", 1);
rh.AddSerialPort(AutoAcpi.SerialPortType.Serial, "SPI1", "7270", 0x5AC2);
platform.WriteAsl();
}
this is the code i used to define the proxy.
thanks for your help
Regards
Related
My Laptop has following SuperIO device in the SSDT Table:
DefinitionBlock ("", "SSDT", 1, "VENDORx", "TABLEx", 0x00001000)
{
Device (\_SB.PC00.LPCB.SIO0)
{
Name (_HID, EisaId ("PNP0A05") /* Generic Container Device */)
Name (_UID, "SD28301")
}
This ID claimed by the ACPI container driver but I see in /sys/bus/container/* that there is no driver associated with this device.
I wanted to write a platform driver to attach with this device. I have the following in my driver code:
static const struct acpi_device_id sio_device_ids[] = {
{ "PNP0A05", 0},
{ "", 0}
};
MODULE_DEVICE_TABLE(acpi, sio_device_ids);
Upon calling platform_driver_register(), my driver does not get bound to the SIO device. To see if kernel is even trying to match the acpi_device_id entries, I changed PNP0A05 in my kernel code to MHF1234 (custom _HID). Then I inserted an SSDT with a device that had _HID same as acpi_device_id in kernel driver like this: Name (_HID, EisaId ("MHF1234"). Now, upon inserting my driver, the probe function got called so my driver matched with the ACPI device.
Question: How do I match my driver with PNP0A05 device? I see that the ACPI container driver already detected and added this to /sys but there is no driver bound to it. Any hints to debug would be appreciated.
The device is being created by the code under drivers/acpi/container.c. However, it's purely ACPI device for now. The platform devices for ACPI ones are created by acpi_create_platform_device() which is supposed to be called by acpi_bus_attach() (via acpi_default_enumeration() because it's not enumerated by parent). However, container_device_attach() on success returns positive number, i.e. 1, and acpi_bus_attach() skips platform device creation due to the conditional. That's why it's not being represented as platform device and hence may not be enumerated via platform bus.
Besides that, ACPI specification tells us the following: PNP0A05 Generic Container Device. A device whose settings are totally controlled by its ACPI resource information, and otherwise needs no device or bus-specific driver support. This was originally known as Generic ISA Bus Device. This ID should only be used for containers that do not produce resources for consumption by child devices. Any system resources claimed by a PNP0A05 device’s _CRS object must be consumed by the container itself.
Hi I am new to kernel driver developement. I am using the raspberry pi as my hostI am trying to create an I2C driver for a custom board we have. The custom board will act as the slave. I am confused about how do I go about entering the devices slave address. From what I understand
You need to either have a board setup file which I dont since its a custom board.
You can edit the device tree
Or you can do it in the user space application.
I am not sure where exactly to edit the device tree if I go with the second option. More over I would like to somehow register the slave address in the I2C driver itself. That way I donot need to rebuild the kernel. One method i was looking at was to set the i2c client from the driver code but that was advised by commentators I am not sure why. Any help would be appreciated.
Instantiating Drivers
So I have finally a working way in which I can bind the I2C device without needing a kernel rebuild. I create two driver files(.ko files). One for registering and one for the actual driver.
The way I did it is I got the bus number to which the device was connected.
(You can look into i2c user space code. i2cdetect -y (busnumber) will help you detect which bus number it is)
Once I knew that I created a driver file which would register my device by getting access to the adapter and then registering it. My bus number was 1 and slave address 0x10
static struct i2c_board_info board_info[] __initdata =
{
{
I2C_BOARD_INFO("my_device", 0x10),
},
};
And in the init function of the driver I register the device by
i2c_new_device(i2c_get_adapter(1), board_info[0])
Thats it. Now once you build this insmod the ko file before insmoding the actual driver file and everything should work.
I am writing a serial driver for UART in windows just for learning purpose. More specifically in WDM.
I will write both the bus driver and function driver.
Currently i am writing the bus driver. So my question is from where i can come to know in my driver that how many serial ports i have in my system, so that i can expose that number of PDO's from my bus driver?? And resources allocated to each port. Do i have to check some kind of registry or windows will provide some kind of structure.
Please help me!! Thanks in advance
Assuming your UARTs are part of the PC, there's already a bus driver which will enumerate them. ACPI.SYS gets information from the platform BIOS, which includes the number and resource assignments for built-in components like UARTs.
If you're writing your driver for an add-in multi-port serial board, then you would need to look at the documentation for the board to determine how you find the number of UARTs. It might be as simple as looking at the PCI Product ID and having a hard-coded count for the type of board you have.
When ACPI enumerates the device, your driver's AddDevice routine will be called to load on it, and you'll receive the assigned resources when handling the PNP START message.
I am studying windows device drivers on my own and I find it's very difficult to differentiate between PDO and FDO. Let me tell you the flow that I have in my head correct me if I am wrong !!
when system boots it loads the root bus driver that will create a FDO. Now it will enumerates its child devices and i guess some hot plug method of the bus driver will be called, when a new child will be found and that method will notify the PNP manager. PNP manager will call the AddDevice() routine of the root bus driver and that will intern create PDOs for new buses like one for PCI and etc. Please explain the whole flow in detail, this is just my imagination. And then it is documented that system will load the functional driver for the PCI bus that will create the FDO ??
what is this FDO?? and why would i need that?? According to me PCI bus driver should also follow the same as done by the root bus, enumerate its child and create PDOs for them, or by this FDO they mean PDO only ?? I am so much confused :( !!
What are you actually doing, or are you just trying to learn? I am just wondering how you ended up this low down in the stack.
PDO = Physical Device Object
FDO = Functional Device Object
A PDO acts as a physical device, but it does not necessarily have to be physical. It is essentially the interface between a device on a bus, and the bus itself. This is pretty well covered on MSDN.
Here is an example that uses USB sticks and this illustrates the difference quite well.
Here is a more in depth explanation and the important quote
If your point of reference is the PCI bus, then Pci.sys is the function driver. But if your point of reference is the Proseware Gizmo device, then Pci.sys is the bus driver. This dual role is typical in the PnP device tree. A driver that serves as function driver for a bus also serves as bus driver for a child device of the bus.
You also have filter drivers which allow you to sit between PDO's and FDO's and start doing naughty stuff like hiding files, POC rootkits etc. At this stage you can add extra functionality, or completely prevent access to the PDO.
And here is all the MSDN links.
http://msdn.microsoft.com/en-us/library/windows/hardware/hh439632(v=vs.85).aspx
http://msdn.microsoft.com/en-us/library/windows/hardware/ff554721(v=vs.85).aspx
http://msdn.microsoft.com/en-us/library/windows/hardware/hh439643(v=vs.85).aspx
http://msdn.microsoft.com/en-us/library/windows/hardware/ff554731(v=vs.85).aspx
http://msdn.microsoft.com/en-us/library/windows/hardware/ff564859(v=vs.85).aspx
http://technet.microsoft.com/en-us/library/cc776371(v=ws.10).aspx
If that doesn't clear it up for you, feel free to post back.
Here is the excerpt form "Programming the Microsoft Windows Driver Model", 2nd edition, Walter One:
- PDO stands for physical device object. The bus driver uses this
object to represent the connection between the device and the bus.
- FDO stands for function device object. The function driver uses
this object to manage the functionality of the device.
- FiDO stands
for filter device object. A filter driver uses this object as a place
to store the information it needs to keep about the hardware and its
filtering activities. (The early beta releases of the Windows 2000
DDK used the term FiDO, and I adopted it then. The DDK no longer
uses this term because, I guess, it was considered too frivolous.)
Hope this helps you out.
According to me PCI bus driver should also follow the same as done by the root bus, enumerate its child and create PDOs for them --WRONG!.
If you are talking about WDM, PnP Manager creates PDOs. Earlier to that, YOU had to create it(after detection of device) in DriverEntry().
I am new to Linux and I need to write a USB driver for a device with 2 interfaces. One interface is HID class (3/0/0) with one interrupt in endpoint and a report descriptor. The other interface is vendor defined with 3 bulk endpoints. In my usb_device_id table I have a USB_DEVICE entry with the VID and PID.
When I plug in the device, my xxx_probe function is called for the vendor defined interface but not for the HID interface. Instead, it appears that a built-in driver called 'generic-usb' is taking control of the HID interface.
Is there a way to ensure that my driver probe function is called first?
Why doesn't Linux make multiple passes looking for a more specific driver first (like Windows does)?
Alternatively, can the 'generic-usb' driver be used to receive data on the interrupt endpoint and to set reports and features on the control pipe?
It appears that libusb-1.0.8 allows an application to take control of interfaces on an attached device without the need of a custom driver. So far it appears to provide all the support that I need.