USB_GADGET_VBUS_DRAW(9) Kernel Mode Gadget API USB_GADGET_VBUS_DRAW(9)NAME
usb_gadget_vbus_draw - constrain controller's VBUS power usage
int usb_gadget_vbus_draw(struct usb_gadget * gadget, unsigned mA);
The device whose VBUS usage is being described
How much current to draw, in milliAmperes. This should be twice the value listed in the configuration descriptor bMaxPower field.
This call is used by gadget drivers during SET_CONFIGURATION calls, reporting how much power the device may consume. For example, this
could affect how quickly batteries are recharged.
Returns zero on success, else negative errno.
David Brownell <firstname.lastname@example.org>
COPYRIGHT Kernel Hackers Manual 3.10 June 2014 USB_GADGET_VBUS_DRAW(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 <email@example.com>
COPYRIGHT Kernel Hackers Manual 3.10 June 2014 USB_GADGET_CONFIG_BU(9)
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