lkml.org 
[lkml]   [2014]   [Jul]   [25]   [last100]   RSS Feed
Views: [wrap][no wrap]   [headers]  [forward] 
 
Messages in this thread
Patch in this message
/
From
Subject[PATCH v2 2/3] usb: gadget: f_fs: add ioctl returning ep descriptor
Date
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@samsung.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 490b30f..a2e18cc 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


\
 
 \ /
  Last update: 2014-07-25 16:21    [W:0.110 / U:0.084 seconds]
©2003-2020 Jasper Spaans|hosted at Digital Ocean and TransIP|Read the blog|Advertise on this site