习惯上,file_operations结构体或者指向这类结构体的指针称为fops,这个结构体中的每一个字段都必须指向驱动程序中实现特定操作的函数,对于不支持的操作,对应的字段可置为NULL值。 struct file_operations Code struct module *owner; 第一个file_operations字段并不是一个操作,相反,它是指向“拥有”该结构的模块的指针...
1staticint__driver_attach(structdevice *dev,void*data)2{3structdevice_driver *drv =data;45/*6* Lock device and try to bind to it. We drop the error7* here and always return 0, because we need to keep trying8* to bind to devices and some drivers will return an error9* simply if...
内核提供很多struct device结构的操作接口(具体可以参考include/linux/device.h和drivers/base/core.c的代码),主要包括初始化(device_initialize)、注册到内核(device_register)、分配存储空间+初始化+注册到内核(device_create)等等,可以根据需要使用。 device和device_driver必须具备相同的名称,内核才能完成匹配操作,进而...
分析以上代码,在unflatten_device_tree()中,调用函数__unflatten_device_tree(),参数initial_boot_params指向Device Tree在内存中的首地址,of_root在经过该函数处理之后,会指向根节点,early_init_dt_alloc_memory_arch是一个函数指针,为struct device_node和struct property结构体分配内存的回调函数(callback)。在__u...
一、drivers 目录 drivers 目录中存储了 驱动程序 相关代码 , 如 USB 总线驱动程序 , PCI 总线驱动程序 , 显卡驱动程序 , 网卡驱动程序 等 ; 二、fs 目录 fs 目录中存储了 虚拟文件系统( Virtual File System ) 相关代码 ; 每个 逻辑文件系统 , 都在 fs 目录下 有对应的目录 , 如 ext2 , ext3 , ex...
deploying device drivers on Linux systems. The distribution comes with a wide range of built-in tools and utilities that simplify the driver development process. Developers can easily access and modify the kernel source code, build custom kernels, and test their drivers in a controlled environment....
Device Drivers ---> [*] Network device support ---> ……….. USB Network Adapters ---> //支持的USB网卡设备 <*> USB Pegasus/Pegasus-II based ethernet device support < > USB RTL8150 based ethernet device support (EXPERIMENTAL) <*> ASIX AX88xxx Based USB 2.0 Ethernet Adapters <*> ...
而i2c_client原型是这样子的,dev就是一个device: c // include/linux/i2c.h structi2c_client{ // ... structdevicedev;/* the device structure */ // ... }; 那么,我想只要找到cdev中的dev,也可以这样子用,对吧?但是: c // inc...
The advantage of direct device control is that you can use cat to move the camera without writing and compiling special code to issue the ioctl calls. When writing command-oriented drivers, there’s no reason to implement the ioctl method. An additional command in the interpreter is easier to...
If your driver needs to do a simple, linear mapping of device memory into a user address space, remap_pfn_range is almost all you really need to do the job. The following code is derived from drivers/char/mem.c and shows how this task is performed in a typical module called simple (...