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参考 /linux/include/linux/usb.h

定义了这2个结构体

struct usb_interface {
  struct usb_host_interface * altsetting;
  struct usb_host_interface * cur_altsetting;
  unsigned num_altsetting;
  struct usb_interface_assoc_descriptor * intf_assoc;
  int minor;
  enum usb_interface_condition condition;
  unsigned is_active:1;
  unsigned sysfs_files_created:1;
  unsigned needs_remote_wakeup:1;
  struct device dev;
  struct device * usb_dev;
  int pm_usage_cnt;
}; 

 

const struct usb_device_id *id指针指向 USB 核心用来做决定的 struct usb_device_id 的指针也被传递到这个函数，

struct usb_interface *intf,这个值从哪来的啊？？

linux-2.6.x/drivers/usb/core/driver.c

/* called from driver core with dev locked */
static int usb_probe_interface(struct device *dev)
{
    struct usb_driver *driver = to_usb_driver(dev->driver);
    struct usb_interface *intf;
    struct usb_device *udev;
    const struct usb_device_id *id;
    int error = -ENODEV;

    dev_dbg(dev, "%s\n", __FUNCTION__);

    if (is_usb_device(dev))     /* Sanity check */
        return error;

    intf = to_usb_interface(dev);
    udev = interface_to_usbdev(intf);

    id = usb_match_id(intf, driver->id_table);
    if (!id)
        id = usb_match_dynamic_id(intf, driver);
    if (id) {
        dev_dbg(dev, "%s - got id\n", __FUNCTION__);

        error = usb_autoresume_device(udev);
        if (error)
            return error;

        /* Interface "power state" doesn't correspond to any hardware
         * state whatsoever. We use it to record when it's bound to
         * a driver that may start I/0: it's not frozen/quiesced.
         */
        mark_active(intf);
        intf->condition = USB_INTERFACE_BINDING;

        /* The interface should always appear to be in use
         * unless the driver suports autosuspend.
         */
        intf->pm_usage_cnt = !(driver->supports_autosuspend);

        error = driver->probe(intf, id);
        if (error) {
            mark_quiesced(intf);
            intf->needs_remote_wakeup = 0;
            intf->condition = USB_INTERFACE_UNBOUND;
        } else
            intf->condition = USB_INTERFACE_BOUND;

        usb_autosuspend_device(udev);
    }

    return error;
}

灰常感谢！！有点眉目了~~

共同进步， 我也是现读才找到    

你也正在学习usb？？有问题继续请教哈！！

我以前阅读过linux驱动的文档， 也是停留在阅读的水平上。    请教不敢当啊，共同交流 。呵呵

嗯，好的！！共同交流~~    

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