To show the relationship between usb port and child device,
add link file "port" under usb device's sysfs directoy and
"child" under usb port device's sysfs directory. They are linked
to each other.
Signed-off-by: Lan Tianyu <tianyu.lan@xxxxxxxxx>
---
drivers/usb/core/hub.c | 17 +++++++++++++++++
1 file changed, 17 insertions(+)
diff --git a/drivers/usb/core/hub.c b/drivers/usb/core/hub.c
index 4d0eebc..0981aea 100644
--- a/drivers/usb/core/hub.c
+++ b/drivers/usb/core/hub.c
@@ -1973,6 +1973,8 @@ void usb_disconnect(struct usb_device **pdev)
{
struct usb_device *udev = *pdev;
struct usb_hub *hub = hdev_to_hub(udev);
+ struct usb_port *port_dev =
+ hdev_to_hub(udev->parent)->ports[udev->portnum - 1];
int i;
/* mark the device as inactive, so any further urb submissions for
@@ -1999,6 +2001,9 @@ void usb_disconnect(struct usb_device **pdev)
usb_disable_device(udev, 0);
usb_hcd_synchronize_unlinks(udev);
+ sysfs_remove_link(&udev->dev.kobj, "port");
+ sysfs_remove_link(&port_dev->dev.kobj,
+ "child");
usb_remove_ep_devs(&udev->ep0);
usb_unlock_device(udev);
@@ -2291,6 +2296,18 @@ int usb_new_device(struct usb_device *udev)
goto fail;
}
+ /* Create link files between child device and usb port device. */
+ if (udev->parent) {
+ int no_warn;
+ struct usb_port *port_dev =
+ hdev_to_hub(udev->parent)->ports[udev->portnum - 1];
+
+ no_warn = sysfs_create_link(&udev->dev.kobj,
+ &port_dev->dev.kobj, "port");
+ no_warn = sysfs_create_link(&port_dev->dev.kobj,
+ &udev->dev.kobj, "child");
+ }
+
(void) usb_create_ep_devs(&udev->dev, &udev->ep0, udev);
usb_mark_last_busy(udev);
pm_runtime_put_sync_autosuspend(&udev->dev);
--
1.7.9.5
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