linux-kernel - Re: [PATCH v6 2/3] usb: gadget: f_fs: add ioctl returning ep descriptor

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Date:	Wed, 27 Aug 2014 14:17:56 -0500
From:	Felipe Balbi <balbi@...com>
To:	Robert Baldyga <r.baldyga@...sung.com>
CC:	<balbi@...com>, <gregkh@...uxfoundation.org>,
	<linux-usb@...r.kernel.org>, <linux-kernel@...r.kernel.org>,
	<mina86@...a86.com>, <m.szyprowski@...sung.com>,
	<andrzej.p@...sung.com>, <k.opasiak@...sung.com>
Subject: Re: [PATCH v6 2/3] usb: gadget: f_fs: add ioctl returning ep
 descriptor

Hi,

On Mon, Aug 25, 2014 at 11:16:28AM +0200, Robert Baldyga wrote:
> This patch introduces ioctl named FUNCTIONFS_ENDPOINT_DESC, which
> returns endpoint descriptor to userspace. It works only if function
> is active.
> 
> Signed-off-by: Robert Baldyga <r.baldyga@...sung.com>
> Acked-by: Michal Nazarewicz <mina86@...a86.com>
> ---
>  drivers/usb/gadget/function/f_fs.c  | 23 +++++++++++++++++++++++
>  include/uapi/linux/usb/functionfs.h |  6 ++++++
>  2 files changed, 29 insertions(+)
> 
> diff --git a/drivers/usb/gadget/function/f_fs.c b/drivers/usb/gadget/function/f_fs.c
> index 0dc3552d..6edf7e4 100644
> --- a/drivers/usb/gadget/function/f_fs.c
> +++ b/drivers/usb/gadget/function/f_fs.c
> @@ -1032,6 +1032,29 @@ static long ffs_epfile_ioctl(struct file *file, unsigned code,
>  		case FUNCTIONFS_ENDPOINT_REVMAP:
>  			ret = epfile->ep->num;
>  			break;
> +		case FUNCTIONFS_ENDPOINT_DESC:
> +		{
> +			int desc_idx;
> +			struct usb_endpoint_descriptor *desc;
> +
> +			switch (epfile->ffs->gadget->speed) {
> +			case USB_SPEED_SUPER:
> +				desc_idx = 2;
> +				break;
> +			case USB_SPEED_HIGH:
> +				desc_idx = 1;
> +				break;
> +			default:
> +				desc_idx = 0;
> +			}
> +			desc = epfile->ep->descs[desc_idx];
> +
> +			spin_unlock_irq(&epfile->ffs->eps_lock);
> +			ret = copy_to_user((void *)value, desc, sizeof(*desc));
> +			if (ret)
> +				ret = -EFAULT;
> +			return;

should return a value here. Have you tested this at all ?

-- 
balbi

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