Re: [PATCH v2 1/5] usb: gadget: Add remote wakeup capable flag

[Thinh Nguyen]

On Tue, Jan 17, 2023, Elson Roy Serrao wrote:
> Add a flag to indicate whether the gadget is capable
> of sending remote wakeup to the host.
> 
> Signed-off-by: Elson Roy Serrao <quic_eserrao@xxxxxxxxxxx>
> ---
>  drivers/usb/gadget/composite.c | 3 +++
>  include/linux/usb/gadget.h     | 2 ++
>  2 files changed, 5 insertions(+)
> 
> diff --git a/drivers/usb/gadget/composite.c b/drivers/usb/gadget/composite.c
> index 403563c..b83963a 100644
> --- a/drivers/usb/gadget/composite.c
> +++ b/drivers/usb/gadget/composite.c
> @@ -965,6 +965,9 @@ static int set_config(struct usb_composite_dev *cdev,
>  	else
>  		usb_gadget_clear_selfpowered(gadget);
>  
> +	if (USB_CONFIG_ATT_WAKEUP & c->bmAttributes)
> +		gadget->rw_capable = 1;

Some device may not support remote wakeup. gadget->rw_capable should be
set and reported by the UDC. May need a gadget ops to enable remote
wakeup here.

Thanks,
Thinh

> +
>  	usb_gadget_vbus_draw(gadget, power);
>  	if (result >= 0 && cdev->delayed_status)
>  		result = USB_GADGET_DELAYED_STATUS;
> diff --git a/include/linux/usb/gadget.h b/include/linux/usb/gadget.h
> index dc3092c..15785f8 100644
> --- a/include/linux/usb/gadget.h
> +++ b/include/linux/usb/gadget.h
> @@ -385,6 +385,7 @@ struct usb_gadget_ops {
>   *	indicates that it supports LPM as per the LPM ECN & errata.
>   * @irq: the interrupt number for device controller.
>   * @id_number: a unique ID number for ensuring that gadget names are distinct
> + * @rw_capable: True if the gadget is capable of sending remote wakeup.
>   *
>   * Gadgets have a mostly-portable "gadget driver" implementing device
>   * functions, handling all usb configurations and interfaces.  Gadget
> @@ -446,6 +447,7 @@ struct usb_gadget {
>  	unsigned			lpm_capable:1;
>  	int				irq;
>  	int				id_number;
> +	unsigned			rw_capable:1;
>  };
>  #define work_to_gadget(w)	(container_of((w), struct usb_gadget, work))
>  
> -- 
> 2.7.4
>