[PATCH v2 04/22] usb: gadget: composite: add USB_DT_OTG request handling

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From: Macpaul Lin <macpaul@xxxxxxxxx>

Copy usb_otg_descriptor from config's descriptor if host requests
USB_DT_OTG.

Signed-off-by: Macpaul Lin <macpaul@xxxxxxxxx>
Signed-off-by: Li Jun <jun.li@xxxxxxxxxxxxx>
---
 drivers/usb/gadget/composite.c | 21 +++++++++++++++++++++
 1 file changed, 21 insertions(+)

diff --git a/drivers/usb/gadget/composite.c b/drivers/usb/gadget/composite.c
index 4e3447b..6b5a0c6 100644
--- a/drivers/usb/gadget/composite.c
+++ b/drivers/usb/gadget/composite.c
@@ -1534,6 +1534,27 @@ composite_setup(struct usb_gadget *gadget, const struct usb_ctrlrequest *ctrl)
 				value = min(w_length, (u16) value);
 			}
 			break;
+		case USB_DT_OTG:
+			if (gadget_is_otg(gadget)) {
+				struct usb_configuration *config;
+				int otg_desc_len =
+					sizeof(struct usb_otg_descriptor);
+
+				if (cdev->config)
+					config = cdev->config;
+				else
+					config = list_first_entry(
+							&cdev->configs,
+						struct usb_configuration, list);
+				if (!config)
+					goto done;
+
+				if (gadget->otg_rev >= 0x0200)
+					otg_desc_len += sizeof(struct bcdOTG);
+				value = min_t(int, w_length, otg_desc_len);
+				memcpy(req->buf, config->descriptors[0], value);
+			}
+			break;
 		}
 		break;
 
-- 
1.9.1

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