浅析struct device结构体

Posted 2021-02-06 -glb

device结构体：设备驱动模型中的基础结构体之一

struct device {

　　/*设备所依附的父设备

　　大多数情况下，这样的设备是某种总线或主控制器

　　如果该成员变量的值为NULL，表示当前设备是一个最顶端设备，通常这样的设备都不是你想得到的那个*/

　　struct device *parent;

　　struct device_private *p;

　　struct kobject kobj;
　　const char *init_name; /* initial name of the device */
　　const struct device_type *type;

　　struct mutex mutex; /* mutex 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;
　　struct dev_pm_domain *pm_domain;

#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 for alloc_coherent mappings as not 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;

　　struct device_node *of_node; /* associated device tree node */

　　dev_t devt; /* dev_t, creates the sysfs "dev" */
　　u32 id; /* device instance */

　　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);
};