redonkable/alistair23-linux
redonkable/alistair23-linux
1
0
Fork 0
Code Releases Activity

usb: Use hub port data to determine whether a port is removable

Browse source 
Hubs have a flag to indicate whether a given port carries removable devices
or not. This is not strictly accurate in that some built-in devices
will be flagged as removable, but followup patches will make use of platform
data to make this more reliable.

Signed-off-by: Matthew Garrett <mjg@redhat.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
This commit is contained in:
Matthew Garrett 2012-02-03 17:11:55 -05:00 committed by Greg Kroah-Hartman
parent 0846e7e985
commit d35e70d50a
1 changed files with 40 additions and 0 deletions
Show stats Download patch file Download diff file Expand all files Collapse all files

40
drivers/usb/core/hub.c
View file

@ -1838,6 +1838,37 @@ fail:
return err;
}
static void set_usb_port_removable(struct usb_device *udev)
{
struct usb_device *hdev = udev->parent;
struct usb_hub *hub;
u8 port = udev->portnum;
u16 wHubCharacteristics;
bool removable = true;
if (!hdev)
return;
hub = hdev_to_hub(udev->parent);
wHubCharacteristics = le16_to_cpu(hub->descriptor->wHubCharacteristics);
if (!(wHubCharacteristics & HUB_CHAR_COMPOUND))
return;
if (hub_is_superspeed(hdev)) {
if (hub->descriptor->u.ss.DeviceRemovable & (1 << port))
removable = false;
} else {
if (hub->descriptor->u.hs.DeviceRemovable[port / 8] & (1 << (port % 8)))
removable = false;
}
if (removable)
udev->removable = USB_DEVICE_REMOVABLE;
else
udev->removable = USB_DEVICE_FIXED;
}
/**
* usb_new_device - perform initial device setup (usbcore-internal)
@ -1896,6 +1927,15 @@ int usb_new_device(struct usb_device *udev)
announce_device(udev);
device_enable_async_suspend(&udev->dev);
/*
* check whether the hub marks this port as non-removable. Do it
* now so that platform-specific data can override it in
* device_add()
*/
if (udev->parent)
set_usb_port_removable(udev);
/* Register the device. The device driver is responsible
* for configuring the device and invoking the add-device
* notifier chain (used by usbfs and possibly others).