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register platform device

admin 11月 13, 2020 0

static void __init (void)
{
    platform_add_devices(mini2440_devices, ARRAY_SIZE(mini2440_devices));
}

int platform_add_devices(struct platform_device **devs, int num)
{
    for (i = 0; i < num; i++)
        ret = platform_device_register(devs[i]);
            return platform_device_add(pdev);
                pdev->dev.bus = &platform_bus_type;	
                // set name
                if (pdev->id != -1)	// 
                    dev_set_name(&pdev->dev, "%s.%d", pdev->name,  pdev->id);
                else
                    dev_set_name(&pdev->dev, "%s", pdev->name);

                ret = device_add(&pdev->dev);
                    bus_probe_device(dev);
}

bus_probe_device

增加一个device时会对platform bus上的所有driver，都执行__device_attach

void bus_probe_device(struct device *dev)
{
    struct bus_type *bus = dev->bus;

    if (bus && bus->p->drivers_autoprobe)
        ret = device_attach(dev);
            ret = bus_for_each_drv(dev->bus, NULL, dev, __device_attach);
                // 遍历platform bus上的所有driver，都执行fn()
                klist_iter_init_node(&bus->p->klist_drivers, &i,
                            start ? &start->p->knode_bus : NULL);
                while ((drv = next_driver(&i)) && !error)
                    error = fn(drv, data);
}

__device_attach

先match，match成功则probe

static int __device_attach(struct device_driver *drv, void *data)
{
    driver_match_device(drv, dev);
        return drv->bus->match ? drv->bus->match(dev, drv) : 1;	// platform_match
            
    return driver_probe_device(drv, dev);
}