[PATCH v4 10/43] usb: gadget: composite: handle vendor descs

[Robert Baldyga]

After binding all configurations in gadget, call prep_vendor_descs()
for each function which uses new API and implements this callback.

Signed-off-by: Robert Baldyga <r.baldyga@xxxxxxxxxxx>
---
 drivers/usb/gadget/composite.c | 31 +++++++++++++++++++++++++++++++
 include/linux/usb/composite.h  |  2 ++
 2 files changed, 33 insertions(+)

diff --git a/drivers/usb/gadget/composite.c b/drivers/usb/gadget/composite.c
index f196bb6..4f5556b 100644
--- a/drivers/usb/gadget/composite.c
+++ b/drivers/usb/gadget/composite.c
@@ -2565,6 +2565,33 @@ int usb_config_do_bind(struct usb_configuration *c)
 }
 EXPORT_SYMBOL_GPL(usb_config_do_bind);
 
+/**
+ * composite_prep_vendor_descs - for each function in each configuration call
+ *	prep_vendor_descs() callback.
+ * @cdev: composite device
+ */
+int composite_prep_vendor_descs(struct usb_composite_dev *cdev)
+{
+	struct usb_configuration *c;
+	struct usb_function *f;
+	int ret;
+
+	list_for_each_entry(c, &cdev->configs, list)
+		list_for_each_entry(f, &c->functions, list) {
+			if (!usb_function_is_new_api(f))
+				continue;
+			if (f->prep_vendor_descs) {
+				ret = f->prep_vendor_descs(f);
+				if (ret)
+					return ret;
+			}
+
+		}
+
+	return 0;
+}
+EXPORT_SYMBOL_GPL(composite_prep_vendor_descs);
+
 static int composite_bind(struct usb_gadget *gadget,
 		struct usb_gadget_driver *gdriver)
 {
@@ -2595,6 +2622,10 @@ static int composite_bind(struct usb_gadget *gadget,
 	if (status < 0)
 		goto fail;
 
+	status = composite_prep_vendor_descs(cdev);
+	if (status < 0)
+		goto fail;
+
 	if (cdev->use_os_string) {
 		status = composite_os_desc_req_prepare(cdev, gadget->ep0);
 		if (status)
diff --git a/include/linux/usb/composite.h b/include/linux/usb/composite.h
index 0a0ff4c..0db473f 100644
--- a/include/linux/usb/composite.h
+++ b/include/linux/usb/composite.h
@@ -599,6 +599,8 @@ extern int composite_os_desc_req_prepare(struct usb_composite_dev *cdev,
 					 struct usb_ep *ep0);
 void composite_dev_cleanup(struct usb_composite_dev *cdev);
 
+int composite_prep_vendor_descs(struct usb_composite_dev *cdev);
+
 void composite_free_descs(struct usb_composite_dev *cdev);
 void composite_free_vendor_descs(struct usb_composite_dev *cdev);
 
-- 
1.9.1