Added USB_GADGETFS_ALLOW_DELEGATE_DESCRIPTORS to Kconfig, this
option is available under USB_GADGETFS and requires EXPERT.
Enabling this option will not change the default behavior of
GadgetFS, but will allow a user to enable descriptor delegation
using ioctls.
---
drivers/usb/gadget/legacy/Kconfig | 12 ++++++++++++
drivers/usb/gadget/legacy/inode.c | 12 ++++++++++--
2 files changed, 22 insertions(+), 2 deletions(-)
diff --git a/drivers/usb/gadget/legacy/Kconfig
b/drivers/usb/gadget/legacy/Kconfig
index 0b36878..c062384 100644
--- a/drivers/usb/gadget/legacy/Kconfig
+++ b/drivers/usb/gadget/legacy/Kconfig
@@ -184,6 +184,18 @@ config USB_GADGETFS
Say "y" to link the driver statically, or "m" to build a
dynamically linked module called "gadgetfs".
+config USB_GADGETFS_ALLOW_DELEGATE_DESCRIPTORS
+ bool "Delegate get descriptor requests to user" if EXPERT
+ depends on USB_GADGETFS
+ default n
+ help
+ This feature allows to enable delegation of GET_DESCRIPTOR
+ requests in GadgetFS.
+ Enabling the request delegation is done through ioctl calls on
+ the control endpoint file descriptor. Once enabled, all
+ GET_DESCRIPTOR requests will be delegated to user mode, and will
+ not be handled by GadgetFS.
+
config USB_FUNCTIONFS
tristate "Function Filesystem"
select USB_LIBCOMPOSITE
diff --git a/drivers/usb/gadget/legacy/inode.c
b/drivers/usb/gadget/legacy/inode.c
index f8a3e75..9a62584 100644
--- a/drivers/usb/gadget/legacy/inode.c
+++ b/drivers/usb/gadget/legacy/inode.c
@@ -178,9 +178,13 @@ static struct dev_data *dev_new (void)
spin_lock_init (&dev->lock);
INIT_LIST_HEAD (&dev->epfiles);
init_waitqueue_head (&dev->wait);
+
+#ifdef CONFIG_USB_GADGETFS_ALLOW_DELEGATE_DESCRIPTORS
feature_set(&dev->supported_features,
GADGETFS_FEATURE_DELEGATE_DESCRIPTORS);
- return dev;
+#endif
+
+ return dev;
}
/*----------------------------------------------------------------------*/
@@ -1414,10 +1418,14 @@ gadgetfs_setup (struct usb_gadget *gadget, const
struct usb_ctrlrequest *ctrl)
case USB_REQ_GET_DESCRIPTOR:
if (ctrl->bRequestType != USB_DIR_IN)
goto unrecognized;
+
+#ifdef CONFIG_USB_GADGETFS_ALLOW_DELEGATE_DESCRIPTORS
if (is_feature_set(&dev->enabled_features,
GADGETFS_FEATURE_DELEGATE_DESCRIPTORS))
goto delegate;
- switch (w_value >> 8) {
+#endif
+
+ switch (w_value >> 8) {
case USB_DT_DEVICE:
value = min (w_length, (u16) sizeof *dev->dev);
--
2.5.0
--
Binyamin Sharet,
Cisco, STARE-C
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