wireless suspend

最新推荐文章于 2024-05-20 13:40:27 发布

david850610

最新推荐文章于 2024-05-20 13:40:27 发布

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CC 4.0 BY-SA版权

文章标签： interface struct table

本文链接：https://blog.youkuaiyun.com/david850610/article/details/4601685

本文介绍了一个USB无线局域网设备驱动程序的实现细节，包括如何处理设备的挂起(suspend)和恢复(resume)操作。当第一个接口被挂起时，整个驱动程序会被挂起，并采取措施加速清空接收队列和发送队列；只有当最后一个接口恢复时，才重新调度后台任务。

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static struct usb_driver rndis_wlan_driver = { .name = "rndis_wlan", .id_table = products, .probe = usbnet_probe, .disconnect = usbnet_disconnect, .suspend = usbnet_suspend, .resume = usbnet_resume, };

/* * suspend the whole driver as soon as the first interface is suspended * resume only when the last interface is resumed */ int usbnet_suspend (struct usb_interface *intf, pm_message_t message) { struct usbnet *dev = usb_get_intfdata(intf); if (!dev->suspend_count++) { /* * accelerate emptying of the rx and queues, to avoid * having everything error out. */ netif_device_detach (dev->net); (void) unlink_urbs (dev, &dev->rxq); (void) unlink_urbs (dev, &dev->txq); /* * reattach so runtime management can use and * wake the device */ netif_device_attach (dev->net); } return 0; }

int usbnet_resume (struct usb_interface *intf) { struct usbnet *dev = usb_get_intfdata(intf); if (!--dev->suspend_count) tasklet_schedule (&dev->bh); return 0; }