Allocate usb otg descriptor and initialize it according to gadget's otg
capabilities, if usb_otg_caps is not set, keep settings as current gadget
drivers. With this 2 new interfaces, gadget can use usb_otg_descriptor
for OTG 1.x, and usb_otg20_descriptor for OTG 2.0 or above, and otg
features can be decided by the combination of usb hardware property
and driver config.
Signed-off-by: Li Jun <jun.li@xxxxxxxxxxxxx>
---
drivers/usb/gadget/config.c | 56 +++++++++++++++++++++++++++++++++++++++++++++
include/linux/usb/gadget.h | 4 ++++
2 files changed, 60 insertions(+)
diff --git a/drivers/usb/gadget/config.c b/drivers/usb/gadget/config.c
index 34e12fc..0fafa7a 100644
--- a/drivers/usb/gadget/config.c
+++ b/drivers/usb/gadget/config.c
@@ -20,6 +20,7 @@
#include <linux/usb/ch9.h>
#include <linux/usb/gadget.h>
#include <linux/usb/composite.h>
+#include <linux/usb/otg.h>
/**
* usb_descriptor_fillbuf - fill buffer with descriptors
@@ -195,3 +196,58 @@ void usb_free_all_descriptors(struct usb_function *f)
usb_free_descriptors(f->ss_descriptors);
}
EXPORT_SYMBOL_GPL(usb_free_all_descriptors);
+
+struct usb_descriptor_header *usb_otg_descriptor_alloc(
+ struct usb_gadget *gadget)
+{
+ struct usb_descriptor_header *otg_desc;
+ unsigned length = 0;
+
+ if (gadget->otg_caps && (gadget->otg_caps->otg_rev >= 0x0200))
+ length = sizeof(struct usb_otg20_descriptor);
+ else
+ length = sizeof(struct usb_otg_descriptor);
+
+ otg_desc = kzalloc(length, GFP_KERNEL);
+ return otg_desc;
+}
+EXPORT_SYMBOL_GPL(usb_otg_descriptor_alloc);
+
+int usb_otg_descriptor_init(struct usb_gadget *gadget,
+ struct usb_descriptor_header *otg_desc)
+{
+ struct usb_otg_descriptor *otg1x_desc;
+ struct usb_otg20_descriptor *otg20_desc;
+ struct usb_otg_caps *otg_caps = gadget->otg_caps;
+ u8 otg_attributes = 0;
+
+ if (!otg_desc)
+ return -EINVAL;
+
+ if (otg_caps && otg_caps->otg_rev) {
+ if (otg_caps->hnp_support)
+ otg_attributes |= USB_OTG_HNP;
+ if (otg_caps->srp_support)
+ otg_attributes |= USB_OTG_SRP;
+ if (otg_caps->adp_support && (otg_caps->otg_rev >= 0x0200))
+ otg_attributes |= USB_OTG_ADP;
+ } else {
+ otg_attributes = USB_OTG_SRP | USB_OTG_HNP;
+ }
+
+ if (otg_caps && (otg_caps->otg_rev >= 0x0200)) {
+ otg20_desc = (struct usb_otg20_descriptor *)otg_desc;
+ otg20_desc->bLength = sizeof(struct usb_otg20_descriptor);
+ otg20_desc->bDescriptorType = USB_DT_OTG;
+ otg20_desc->bmAttributes = otg_attributes;
+ otg20_desc->bcdOTG = cpu_to_le16(otg_caps->otg_rev);
+ } else {
+ otg1x_desc = (struct usb_otg_descriptor *)otg_desc;
+ otg1x_desc->bLength = sizeof(struct usb_otg_descriptor);
+ otg1x_desc->bDescriptorType = USB_DT_OTG;
+ otg1x_desc->bmAttributes = otg_attributes;
+ }
+
+ return 0;
+}
+EXPORT_SYMBOL_GPL(usb_otg_descriptor_init);
diff --git a/include/linux/usb/gadget.h b/include/linux/usb/gadget.h
index 6b39087..5f65bd2 100644
--- a/include/linux/usb/gadget.h
+++ b/include/linux/usb/gadget.h
@@ -1004,6 +1004,10 @@ int usb_assign_descriptors(struct usb_function *f,
struct usb_descriptor_header **ss);
void usb_free_all_descriptors(struct usb_function *f);
+struct usb_descriptor_header *usb_otg_descriptor_alloc(
+ struct usb_gadget *gadget);
+int usb_otg_descriptor_init(struct usb_gadget *gadget,
+ struct usb_descriptor_header *otg_desc);
/*-------------------------------------------------------------------------*/
/* utility to simplify map/unmap of usb_requests to/from DMA */
--
1.9.1
--
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