linux总线、设备和驱动程序

最新推荐文章于 2024-08-05 18:15:34 发布

原创最新推荐文章于 2024-08-05 18:15:34 发布 · 936 阅读

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本文介绍了Linux驱动程序的基本模型，包括总线、设备和驱动三个核心模块。详细解释了每个模块的作用及其实现方式，并展示了设备结构体的具体字段，有助于理解Linux内核中设备驱动的工作原理。

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linux的驱动程序，模型一般在总线、设备、驱动3个模块

1、总线

struct bus_type{

char *name;

struct subsystem subsys;

struct kset drivers

};

2、设备

struct device {
   struct device                  *parent;
   struct device_private   *p;
   struct kobject                 kobj;
   const char                      *init_name; /* initial name of the device */
   struct device_type         *type;
   struct semaphore         sem;   /* semaphore to synchronize calls to its driver. */
   struct bus_type   *bus;       /* type of bus device is on */
   struct device_driver *driver;   /* which driver has allocated this device */
   void       *platform_data;   /* Platform specific data, device core doesn't touch it */
   struct dev_pm_info   power;
#ifdef CONFIG_NUMA
   int       numa_node;   /* NUMA node this device is close to */
#endif
   u64       *dma_mask;   /* dma mask (if dma'able device) */
   u64       coherent_dma_mask;/* Like dma_mask, but foralloc_coherent mappings asnot all hardware supports
                         64 bit addresses for consistent
                         allocations such descriptors. */

   struct device_dma_parameters *dma_parms;

   struct list_head   dma_pools;   /* dma pools (if dma'ble) */

   struct dma_coherent_mem   *dma_mem; /* internal for coherent mem
                         override */
   /* arch specific additions */
   struct dev_archdata   archdata;

   dev_t           devt;   /* dev_t, creates the sysfs "dev" */

   spinlock_t       devres_lock;
   struct list_head   devres_head;

   struct klist_node   knode_class;
   struct class       *class;
   const struct attribute_group **groups;   /* optional groups */

   void   (*release)(struct device *dev);
};