[PATCH v6 22/23] usb: gadget: serial: allocate and init otg descriptor by otg capabilities

[Li Jun <jun.li-KZfg59tc24xl57MIdRCFDg@public.gmane.org>]

Allocate and initialize usb otg descriptor according to gadget otg
capabilities, add it for each usb configurations. If otg capability
is not defined, keep its original otg descriptor unchanged.

Signed-off-by: Li Jun <jun.li-KZfg59tc24xl57MIdRCFDg@public.gmane.org>
---
 drivers/usb/gadget/legacy/serial.c | 29 +++++++++++++++--------------
 1 file changed, 15 insertions(+), 14 deletions(-)

diff --git a/drivers/usb/gadget/legacy/serial.c b/drivers/usb/gadget/legacy/serial.c
index 8b7528f..d1cd025 100644
--- a/drivers/usb/gadget/legacy/serial.c
+++ b/drivers/usb/gadget/legacy/serial.c
@@ -79,20 +79,7 @@ static struct usb_device_descriptor device_desc = {
 	.bNumConfigurations =	1,
 };
 
-static struct usb_otg_descriptor otg_descriptor = {
-	.bLength =		sizeof otg_descriptor,
-	.bDescriptorType =	USB_DT_OTG,
-
-	/* REVISIT SRP-only hardware is possible, although
-	 * it would not be called "OTG" ...
-	 */
-	.bmAttributes =		USB_OTG_SRP | USB_OTG_HNP,
-};
-
-static const struct usb_descriptor_header *otg_desc[] = {
-	(struct usb_descriptor_header *) &otg_descriptor,
-	NULL,
-};
+static const struct usb_descriptor_header *otg_desc[2];
 
 /*-------------------------------------------------------------------------*/
 
@@ -191,6 +178,16 @@ static int gs_bind(struct usb_composite_dev *cdev)
 	serial_config_driver.iConfiguration = status;
 
 	if (gadget_is_otg(cdev->gadget)) {
+		if (!otg_desc[0]) {
+			struct usb_descriptor_header *usb_desc;
+
+			usb_desc = usb_otg_descriptor_alloc(cdev->gadget);
+			if (!usb_desc)
+				return -ENOMEM;
+			usb_otg_descriptor_init(cdev->gadget, usb_desc);
+			otg_desc[0] = usb_desc;
+			otg_desc[1] = NULL;
+		}
 		serial_config_driver.descriptors = otg_desc;
 		serial_config_driver.bmAttributes |= USB_CONFIG_ATT_WAKEUP;
 	}
@@ -227,6 +224,10 @@ static int gs_unbind(struct usb_composite_dev *cdev)
 		usb_put_function(f_serial[i]);
 		usb_put_function_instance(fi_serial[i]);
 	}
+
+	kfree(otg_desc[0]);
+	otg_desc[0] = NULL;
+
 	return 0;
 }
 
-- 
1.9.1

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