自贡网站开发,wordpress新建主题,网站正在建设源代码,做网站的客户需求bbb 的 emmc驱动在drivers\mmc\card\block.c#xff0c;其mmc_dirver结构体如下#xff0c;
根据以往平台总线驱动模型的经验来看的话#xff0c;内核里应该有mmc_devices结构体#xff0c;并且
其name也为mmcblk#xff0c;这样其probe函数将被调用#x…bbb 的 emmc驱动在drivers\mmc\card\block.c其mmc_dirver结构体如下
根据以往平台总线驱动模型的经验来看的话内核里应该有mmc_devices结构体并且
其name也为mmcblk这样其probe函数将被调用但是搜索整个内核文件并没有发现mmc_devices。
现在我们分析一下mmc_blk_probe什么时候被调用。
static struct mmc_driver mmc_driver {
.drv { .name mmcblk, }, .probe mmc_blk_probe, .remove mmc_blk_remove, .suspend mmc_blk_suspend, .resume mmc_blk_resume,
}; static int __init mmc_blk_init(void) //drivers\mmc\card\block.c { res mmc_register_driver(mmc_driver); //注册mmc_driver } int mmc_register_driver(struct mmc_driver *drv) //drivers\mmc\core\bus.c { drv-drv.bus mmc_bus_type; //mmc设备是挂载在mmc总线上的 return driver_register(drv-drv); //注册mmc驱动 } int driver_register(struct device_driver *drv) //drivers\base\driver.c { other driver_find(drv-name, drv-bus); //在总线上查找是否已经注册过此驱动 if (other) { put_driver(other); printk(KERN_ERR Error: Driver %s is already registered, aborting...\n, drv-name); return -EBUSY; } ret bus_add_driver(drv); //如果没有注册过则注册此驱动 } int bus_add_driver(struct device_driver *drv) //drivers\base\bus.c { error driver_attach(drv); error driver_create_file(drv, driver_attr_uevent); } //try to bind driver to devices
int driver_attach(struct device_driver *drv) //drivers/base/dd.c { return bus_for_each_dev(drv-bus, NULL, drv, __driver_attach); //__driver_attach的里面device的查找还没搞清楚 } static int __driver_attach(struct device *dev, void *data) //drivers/base/dd.c
{ if (!driver_match_device(drv, dev)) return 0; driver_probe_device(drv, dev);
} static inline int driver_match_device(struct device_driver *drv, //drivers/base/base.h struct device *dev) { //这里调用了mmc总线的match函数 return drv-bus-match ? drv-bus-match(dev, drv) : 1; } static int mmc_bus_match(struct device *dev, struct device_driver *drv) //drivers\mmc\core\bus.c { //mmc总线的match直接返回了1 return 1; } int driver_probe_device(struct device_driver *drv, struct device *dev) //drivers/base/dd.c { really_probe(dev, drv); } static int really_probe(struct device *dev, struct device_driver *drv) //drivers/base/dd.c { dev-bus-probe(dev); //这里调用总线的probe函数 } static int mmc_bus_probe(struct device *dev) //drivers\mmc\core\bus.c { return drv-probe(card); //最终mmc总线的probe函数调用mmc_driver的probe函数 }
