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Commit c559a353 authored by Robert Baldyga's avatar Robert Baldyga Committed by Felipe Balbi
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usb: gadget: f_fs: add ioctl returning ep descriptor 



This patch introduces ioctl named FUNCTIONFS_ENDPOINT_DESC, which
returns endpoint descriptor to userspace. It works only if function
is active.

Signed-off-by: default avatarRobert Baldyga <r.baldyga@samsung.com>
Acked-by: default avatarMichal Nazarewicz <mina86@mina86.com>
Signed-off-by: default avatarFelipe Balbi <balbi@ti.com>
parent e45cfa20

drivers/usb/gadget/function/f_fs.c

+23 −0
Original line number Diff line number Diff line
@@ -1026,6 +1026,29 @@ 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 ret;

		}

		default:

			ret = -ENOTTY;

		}

include/uapi/linux/usb/functionfs.h

+6 −0
Original line number Diff line number Diff line
@@ -275,6 +275,12 @@ struct usb_functionfs_event { 
 */

#define	FUNCTIONFS_ENDPOINT_REVMAP	_IO('g', 129)



/*

 * Returns endpoint descriptor. If function is not active returns -ENODEV.

 */

#define	FUNCTIONFS_ENDPOINT_DESC	_IOR('g', 130, \

					     struct usb_endpoint_descriptor)







#endif /* _UAPI__LINUX_FUNCTIONFS_H__ */