USB_DESCRIPTOR_FILLB(9) Kernel Mode Gadget API USB_DESCRIPTOR_FILLB(9)NAME
usb_descriptor_fillbuf - fill buffer with descriptors
int usb_descriptor_fillbuf(void * buf, unsigned buflen, const struct usb_descriptor_header ** src);
Buffer to be filled
Size of buf
Array of descriptor pointers, terminated by null pointer.
Copies descriptors into the buffer, returning the length or a negative error code if they can't all be copied. Useful when assembling
descriptors for an associated set of interfaces used as part of configuring a composite device; or in other cases where sets of descriptors
need to be marshaled.
David Brownell <email@example.com>
COPYRIGHT Kernel Hackers Manual 3.10 June 2014 USB_DESCRIPTOR_FILLB(9)
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USB_GADGET_CONFIG_BU(9) Kernel Mode Gadget API USB_GADGET_CONFIG_BU(9)NAME
usb_gadget_config_buf - builts a complete configuration descriptor
int usb_gadget_config_buf(const struct usb_config_descriptor * config, void * buf, unsigned length,
const struct usb_descriptor_header ** desc);
Header for the descriptor, including characteristics such as power requirements and number of interfaces.
Buffer for the resulting configuration descriptor.
Length of buffer. If this is not big enough to hold the entire configuration descriptor, an error code will be returned.
Null-terminated vector of pointers to the descriptors (interface, endpoint, etc) defining all functions in this device configuration.
This copies descriptors into the response buffer, building a descriptor for that configuration. It returns the buffer length or a negative
status code. The config.wTotalLength field is set to match the length of the result, but other descriptor fields (including power usage and
interface count) must be set by the caller.
Gadget drivers could use this when constructing a config descriptor in response to USB_REQ_GET_DESCRIPTOR. They will need to patch the
resulting bDescriptorType value if USB_DT_OTHER_SPEED_CONFIG is needed.
David Brownell <firstname.lastname@example.org>
COPYRIGHT Kernel Hackers Manual 3.10 June 2014 USB_GADGET_CONFIG_BU(9)
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