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>
Acked-by: Michal Nazarewicz <mina86@xxxxxxxxxx>
---
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 dc30adf..6405e0f 100644
--- a/drivers/usb/gadget/function/f_fs.c
+++ b/drivers/usb/gadget/function/f_fs.c
@@ -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;
}
diff --git a/include/uapi/linux/usb/functionfs.h b/include/uapi/linux/usb/functionfs.h
index 6d2a16b..7c7a2fe 100644
--- a/include/uapi/linux/usb/functionfs.h
+++ b/include/uapi/linux/usb/functionfs.h
@@ -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__ */
--
1.9.1
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