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linux-bus,device,driver,class
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ÔÚ Linux É豸ģÐÍÖÐ, ×ÜÏßÓÉ bus_type ½á¹¹±íʾ, ¶¨ÒåÔÚ £º
struct bus_type {
    const char        * name;/*×ÜÏßÀàÐÍÃû³Æ*/
    struct module        * owner;/*Ö¸ÏòÄ£¿éµÄÖ¸Õë(Èç¹ûÓÐ), ´ËÄ£¿é¸ºÔð²Ù×÷Õâ¸ö×ÜÏß*/
    struct kset        subsys;/*ºÍ¸Ã×ÜÏßÏà¹ØµÄ×Óϵͳ*/
    struct kset        drivers;/*×ÜÏßÇý¶¯³ÌʽµÄkset*/
    struct kset        devices;/* ¹ÒÔÚ¸Ã×ÜÏßµÄËùÓÐÉ豸µÄkset*/
    struct klist        klist_devices;/*ºÍ¸Ã×ÜÏßÏà¹ØµÄÇý¶¯³ÌʽÁ´±í*/
    struct klist        klist_drivers;/*¹Ò½ÓÔÚ¸Ã×ÜÏßµÄÉ豸Á´±í*/
    struct blocking_notifier_head bus_notifier;
    struct bus_attribute    * bus_attrs; /*×ÜÏßÊôÐÔ*/
    struct device_attribute * dev_attrs; /*É豸ÊôÐÔ,Ö¸ÏòΪÿ¸ö¼ÓÈë×ÜÏßµÄÉ豸½¨Á¢µÄĬÈÏÊôÐÔÁ´±í*/
    struct driver_attribute * drv_attrs; /*Çý¶¯³ÌʽÊôÐÔ*/
    struct bus_attribute drivers_autoprobe_attr;/*Çý¶¯×Ô¶¯Ì½²âÊôÐÔ*/
    struct bus_attribute drivers_probe_attr;/*Çý¶¯Ì½²âÊôÐÔ*/
    int        (*match)(struct device * dev, struct device_driver * drv);
    int        (*uevent)(struct device *dev, char **envp,
                 int num_envp, char *buffer, int buffer_size);
    int        (*probe)(struct device * dev);
    int        (*remove)(struct device * dev);
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