linux-kernel - Re: [PATCH v3 2/3] usb: gadget: f_fs: add ioctl returning ep descriptor

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Date:	Wed, 30 Jul 2014 19:28:24 +0400
From:	Sergei Shtylyov <sergei.shtylyov@...entembedded.com>
To:	Robert Baldyga <r.baldyga@...sung.com>, balbi@...com
CC:	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 v3 2/3] usb: gadget: f_fs: add ioctl returning ep descriptor

On 07/30/2014 01:43 PM, 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>
> ---
>   drivers/usb/gadget/f_fs.c           | 17 +++++++++++++++++
>   include/uapi/linux/usb/functionfs.h |  6 ++++++
>   2 files changed, 23 insertions(+)

> diff --git a/drivers/usb/gadget/f_fs.c b/drivers/usb/gadget/f_fs.c
> index 6b806be..7f16c5a 100644
> --- a/drivers/usb/gadget/f_fs.c
> +++ b/drivers/usb/gadget/f_fs.c
> @@ -1031,6 +1031,23 @@ 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;
> +
> +			if (epfile->ffs->gadget->speed == USB_SPEED_SUPER)
> +				desc_idx = 2;
> +			else if (epfile->ffs->gadget->speed == USB_SPEED_HIGH)
> +				desc_idx = 1;
> +			else
> +				desc_idx = 0;

    I think the above is asking to be a *switch* statement instead.

> +			desc = epfile->ep->descs[desc_idx];
> +			ret = copy_to_user((void *)value, desc, sizeof(*desc));
> +			if (ret)
> +				ret = -EFAULT;
> +			break;
> +		}
>   		default:
>   			ret = -ENOTTY;
>   		}

WBR, Sergei

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