11/8/2023 0 Comments Adding char driver to kernel linux![]() ![]() ![]() ![]() H ere, the driver which we are going to write lives in the kernel space. All those APIs we are going to understand in the subsequent articles.įirst, let’s get started with understanding the importance of device number. That means our device driver has to get registered with the VFS by using virtual files systems kernel APIs. If you’re wondering how these a user space system calls will get connected to the driver system call implementation methods, this is taken care by the VFS (that is virtual file system) of the kernel. T he read method of the driver will read from the hardware, and it should submit data back to the user, and the write method of the driver should accept data from the user space, it should write the data to the hardware. And the drivers read and write functions or methods that will then forward data to the hardware, or it will read data from the hardware. We have to understand how to establish such connections from userspace to the device drivers. When the user application uses an open system call, that open system call should connect to the open system call implementation of your driver.Īnd when the user that application uses to read and write system calls, those system calls must connect to the read and write implementations or methods of your driver. When the user application wants to talk to the hardware, it uses it’s a system call, such as open, read and write. In our case, the hardware is a simple memory area. In this article, we are going to write a character driver. ![]()
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