usb: gadget: audio: allocate and init otg descriptor by otg capabilities

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@freescale.com>
Reviewed-by: Roger Quadros <rogerq@ti.com>
Signed-off-by: Felipe Balbi <balbi@ti.com>

diff --git a/drivers/usb/gadget/legacy/audio.c b/drivers/usb/gadget/legacy/audio.c
index b8095bfe57b63b253b3d6564013dd5a2b3a7a092..9b2c1c68746bc1328b39bd49b1e3bca6f867cdd3 100644 (file)
--- a/drivers/usb/gadget/legacy/audio.c
+++ b/drivers/usb/gadget/legacy/audio.c
@@ -150,20 +150,7 @@ 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];
 
 /*-------------------------------------------------------------------------*/
 
@@ -259,14 +246,28 @@ static int audio_bind(struct usb_composite_dev *cdev)
        device_desc.iManufacturer = strings_dev[USB_GADGET_MANUFACTURER_IDX].id;
        device_desc.iProduct = strings_dev[USB_GADGET_PRODUCT_IDX].id;
 
+       if (gadget_is_otg(cdev->gadget) && !otg_desc[0]) {
+               struct usb_descriptor_header *usb_desc;
+
+               usb_desc = usb_otg_descriptor_alloc(cdev->gadget);
+               if (!usb_desc)
+                       goto fail;
+               usb_otg_descriptor_init(cdev->gadget, usb_desc);
+               otg_desc[0] = usb_desc;
+               otg_desc[1] = NULL;
+       }
+
        status = usb_add_config(cdev, &audio_config_driver, audio_do_config);
        if (status < 0)
-               goto fail;
+               goto fail_otg_desc;
        usb_composite_overwrite_options(cdev, &coverwrite);
 
        INFO(cdev, "%s, version: %s\n", DRIVER_DESC, DRIVER_VERSION);
        return 0;
 
+fail_otg_desc:
+       kfree(otg_desc[0]);
+       otg_desc[0] = NULL;
 fail:
 #ifndef CONFIG_GADGET_UAC1
        usb_put_function_instance(fi_uac2);
@@ -289,6 +290,9 @@ static int audio_unbind(struct usb_composite_dev *cdev)
        if (!IS_ERR_OR_NULL(fi_uac2))
                usb_put_function_instance(fi_uac2);
 #endif
+       kfree(otg_desc[0]);
+       otg_desc[0] = NULL;
+
        return 0;
 }