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

[Robert Baldyga]

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@xxxxxxxxxxx>
---
 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;
+			desc = epfile->ep->descs[desc_idx];
+			ret = copy_to_user((void *)value, desc, sizeof(*desc));
+			if (ret)
+				ret = -EFAULT;
+			break;
+		}
 		default:
 			ret = -ENOTTY;
 		}
diff --git a/include/uapi/linux/usb/functionfs.h b/include/uapi/linux/usb/functionfs.h
index 1dc473a..1ab6f06 100644
--- a/include/uapi/linux/usb/functionfs.h
+++ b/include/uapi/linux/usb/functionfs.h
@@ -197,6 +197,12 @@ struct usb_functionfs_event {
  */
 #define	FUNCTIONFS_ENDPOINT_REVMAP	_IO('g', 129)
 
+/*
+ * Returns endpoint descriptor. In funciton is not active returns -ENODEV.
+ */
+#define	FUNCTIONFS_ENDPOINT_DESC	_IOR('g', 130, \
+					     struct usb_endpoint_descriptor)
+
 
 
 #endif /* _UAPI__LINUX_FUNCTIONFS_H__ */
-- 
1.9.1

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