On 06/23/2017 11:54 AM, Bin Meng wrote:
> Sometimes we need know if a given hub device is root hub or not.
> Add a new API to test this.
>
> Signed-off-by: Bin Meng <bmeng...@gmail.com>
> ---
>
> common/usb_hub.c | 10 ++++++++++
> include/usb.h | 8 ++++++++
> 2 files changed, 18 insertions(+)
>
> diff --git a/common/usb_hub.c b/common/usb_hub.c
> index 18bd827..d780251 100644
> --- a/common/usb_hub.c
> +++ b/common/usb_hub.c
> @@ -74,6 +74,16 @@ static inline bool usb_hub_is_superspeed(struct usb_device
> *hdev)
> return hdev->descriptor.bDeviceProtocol == 3;
> }
>
> +#ifdef CONFIG_DM_USB
> +bool usb_hub_is_root_hub(struct udevice *hub)
> +{
> + if (device_get_uclass_id(hub->parent) != UCLASS_USB_HUB)
Can this call fail ?
> + return true;
> +
> + return false;
> +}
> +#endif
> +
> static int usb_get_hub_descriptor(struct usb_device *dev, void *data, int
> size)
> {
> unsigned short dtype = USB_DT_HUB;
> diff --git a/include/usb.h b/include/usb.h
> index eb82cc2..c504d71 100644
> --- a/include/usb.h
> +++ b/include/usb.h
> @@ -776,6 +776,14 @@ int usb_setup_device(struct usb_device *dev, bool
> do_read,
> struct usb_device *parent);
>
> /**
> + * usb_hub_is_root_hub() - Test whether a hub device is root hub or not
> + *
> + * @hub: USB hub device to test
> + * @return: true if the hub device is root hub, false otherwise.
> + */
> +bool usb_hub_is_root_hub(struct udevice *hub);
> +
> +/**
> * usb_hub_scan() - Scan a hub and find its devices
> *
> * @hub: Hub device to scan
>
--
Best regards,
Marek Vasut
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