Add independent options for identify the capabilities of
ADP/SRP/HNP feature for OTG devices.
Signed-off-by: Macpaul Lin <macp...@gmail.com>
changes for v2:
- no change
changes for v3:
- composite.h: add usb_gadget_customize_otg_desc() declaration.
- composite.c: replace static configuration of ADP/SRP/HNP capabilities
with runtime polling usb_gadget_customize_otg_desc().
---
drivers/usb/gadget/composite.c | 34 ++++++++++++++++++++++++++++++++++
include/linux/usb/composite.h | 2 ++
2 files changed, 36 insertions(+)
diff --git a/drivers/usb/gadget/composite.c b/drivers/usb/gadget/composite.c
index 4e3447b..81ef3f0 100644
--- a/drivers/usb/gadget/composite.c
+++ b/drivers/usb/gadget/composite.c
@@ -1441,6 +1441,34 @@ static int fill_ext_prop(struct usb_configuration *c,
int interface, u8 *buf)
return 0;
}
+struct usb_otg_descriptor
+*usb_gadget_customize_otg_desc(struct usb_gadget *gadget)
+{
+ struct usb_composite_dev *cdev = get_gadget_data(gadget);
+ struct usb_request *req = cdev->req;
+ struct usb_otg_descriptor *otg_desc = req->buf;
+ struct usb_otg_descriptor20 *otg_desc20 = req->buf;
+
+ otg_desc->bDescriptorType = USB_DT_OTG;
+
+ if (gadget_is_otg20(gadget)) { /* If supports OTG 2.0 */
+ otg_desc->bLength = sizeof(*otg_desc20);
+ otg_desc20->bcdOTG = cpu_to_le16(0x0200);
+ } else { /* If only supports OTG 1.3 */
+ otg_desc->bLength = sizeof(*otg_desc);
+ }
+
+ if (gadget->adp_support)
+ otg_desc->bmAttributes |= USB_OTG_ADP;
+ if (gadget->hnp_support)
+ otg_desc->bmAttributes |= USB_OTG_HNP;
+ if (gadget->srp_support)
+ otg_desc->bmAttributes |= USB_OTG_SRP;
+
+ return otg_desc;
+}
+EXPORT_SYMBOL_GPL(usb_gadget_customize_otg_desc);
+
/*
* The setup() callback implements all the ep0 functionality that's
* not handled lower down, in hardware or the hardware driver(like
@@ -1487,6 +1515,12 @@ composite_setup(struct usb_gadget *gadget, const struct
usb_ctrlrequest *ctrl)
goto unknown;
switch (w_value >> 8) {
+ case USB_DT_OTG:
+ usb_gadget_customize_otg_desc(gadget);
+
+ value = min_t(int, w_length,
+ sizeof(struct usb_otg_descriptor));
+ break;
case USB_DT_DEVICE:
cdev->desc.bNumConfigurations =
count_configs(cdev, USB_DT_DEVICE);
diff --git a/include/linux/usb/composite.h b/include/linux/usb/composite.h
index 2511469..a867242 100644
--- a/include/linux/usb/composite.h
+++ b/include/linux/usb/composite.h
@@ -507,6 +507,8 @@ extern struct usb_string *usb_gstrings_attach(struct
usb_composite_dev *cdev,
extern int usb_string_ids_n(struct usb_composite_dev *c, unsigned n);
extern void composite_disconnect(struct usb_gadget *gadget);
+extern struct usb_otg_descriptor
+ *usb_gadget_customize_otg_desc(struct usb_gadget *gadget);
extern int composite_setup(struct usb_gadget *gadget,
const struct usb_ctrlrequest *ctrl);
extern void composite_suspend(struct usb_gadget *gadget);
--
1.8.3.2
--
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