Linux总线设备驱动

static const struct sysfs_ops dev_sysfs_ops= {
    .show    = dev_attr_show,
    .store    = dev_attr_store,
};
static struct kobj_type device_ktype = {
    .release    = device_release,
    .sysfs_ops    = &dev_sysfs_ops,
    .namespace    = device_namespace,
};
struct bus_type platform_bus_type = {
    .name        = "platform",
    .dev_attrs    = platform_dev_attrs,
    .match        = platform_match,
    .uevent        = platform_uevent,
    .pm        = &platform_dev_pm_ops,
};
struct device_attribute {
    struct attribute attr;
    ssize_t (*show)(structdevice* dev, struct device_attribute* attr,char* buf);
    ssize_t (*store)(structdevice* dev, struct device_attribute* attr, const char* buf, size_t count);
};
static struct device_attributeplatform_dev_attrs[] = {
    __ATTR_RO(modalias),
    __ATTR_NULL,
};

platform_device_register
    -->device_initialize(&pdev->dev);
            -->...
            -->dev->kobj.kset = devices_kset;
            -->kobject_init(&dev->kobj, &device_ktype);
            -->...
    -->return platform_device_add(pdev);
            -->...
            -->pdev->dev.bus = &platform_bus_type; //match()被注册
            --> ret = device_add(&pdev->dev);
                   -->...
                   -->error = device_create_file(dev, &uevent_attr);
                   -->...
                   -->error = device_add_attrs(dev);
                   -->...
                   -->error = bus_add_device(dev);
                   -->...
                   -->kobject_uevent(&dev->kobj, KOBJ_ADD);

                   -->bus_probe_device(dev);//见device_register的bus_probe_device
 

 
device_register

    ->bus_probe_device

        -->device_attach

            -->bus_for_each_drv(dev->bus, NULL,dev,__device_attach);

                -->__device_attach

                    -->driver_match_device

                        -->drv->bus->match//调用platform_bus_type的match()

                    -->driver_probe_device

                        -->really_probe

                            -->drv->probe(dev)//调用probe()

platform_driver_register
    -->drv->driver.bus = &platform_bus_type;
    -->if (drv->probe)
    -->    drv->driver.probe = platform_drv_probe;
    -->if (drv->remove)
    -->    drv->driver.remove = platform_drv_remove;
    -->if (drv->shutdown)
    -->    drv->driver.shutdown = platform_drv_shutdown;
    -->return driver_register(&drv->driver);//见driver_register

driver_register

    -->bus_add_driver

        -->driver_attach

            --> bus_for_each_dev(drv->bus, NULL,drv,__driver_attach );

                --> __driver_attach

                    -->driver_match_device

                        -->drv->bus->match//调用platform_bus_type的match()

                    -->driver_probe_device

                        -->really_probe

                            -->drv->probe(dev)//调用probe()



由此可见：
      
不管是先注册device还是先注册driver，最后都是调用drv->probe(dev)