所有的miscdevice设备形成了一个链表,对设备访问时内核根据次设备号查找对应的miscdevice设备,然后调用其file_operations结构中注册的文件操作接口进行操作。 在内核中用struct miscdevice表示miscdevice设备,然后调用其file_operations结构中注册的文件操作接口进行操作。miscdevice的API实现在drivers/char/misc.c中。 下边是...
4、int driver_create_file(struct device_driver * drv, struct driver_attribute * attr); void driver_remove_file(struct device_driver * drv, struct driver_attribute * attr);分别是在sys文件系统中为device_driver对象创建和删除目录。五、参考:Understanding the linux kernelhttp://lxr.linux.no/linux/...
总体来说，devicetree与structdevice的关系应该还是在其生成platformdevice的时候，一直传递的structdevice *parent参数。下面先把其源码中传递过程描述如下（仍以At91rm9200为例）：1,DT_MACHINE_START(at91sam_dt,"Atmel AT91SAM (Device Tree)")/*Maintainer: Atmel */ .timer =&at91sam926x_time...
module_device = device_create(module_class, NULL, MKDEV(major_num, 0), NULL, DEVICE_NAME); if(IS_ERR(module_device)) { class_destroy(module_class); unregister_chrdev(major_num, DEVICE_NAME); printk(KERN_INFO "[arttnba3_TestModule:] Failed to create the device!\n"); return PTR_ERR...
phy_devicestructphy_device{ structphy_driver*drv;// PHY设备驱动 structmii_bus*bus;// 对应的MII总线 structdevicedev;// 设备文件 u32 phy_id;// PHY ID structphy_c45_device_idsc45_ids; boolis_c45; boolis_internal; boolhas_fixups;
*recursively create devices for all the child nodes. */ //为节点和其孩子节点生成一个设备文件。 staticint of_platform_bus_create(structdevice_node *bus, const struct of_device_id *matches, const struct of_dev_auxdata *lookup, struct device *parent, boolstrict) ...
示例2: nv30_screen_create ▲点赞 6▼ struct pipe_screen *nv30_screen_create(struct nouveau_device *dev){structnv30_screen*screen=CALLOC_STRUCT(nv30_screen);structpipe_screen*pscreen;structnouveau_pushbuf*push;structnv04_fifo*fifo;unsignedoclass =0;intret, i;if(!screen)returnNULL;switch(de...
(de-)allocation: mm, files, fs, tty, keyrings, mems_allowed, mempolicy: */ spinlock_t alloc_lock; /* Protection of the PI data structures: */ raw_spinlock_t pi_lock; struct wake_q_node wake_q /* Journalling filesystem info: */ void *journal_info; /* Stacked block device info:...
* __register_chrdev - create and register a cdev occupying a range of minors * @major: major device number or 0 for dynamic allocation * @baseminor: first of the requested range of minor numbers * @count: the number of minor numbers required ...
这就是有些驱动程序没有显式调用device_create,却出现了设备节点的原因*/41misc->this_device = device_create(misc_class, misc->parent, dev, NULL,42"%s", misc->name);43if(IS_ERR(misc->this_device)) {44err = PTR_ERR(misc->this_device);45gotoout;46}4748/*49* Add it to the front,...