Class: LIBUSB::Bos::Usb20Extension

Inherits:
FFI::Struct
  • Object
show all
Includes:
GenericMethods
Defined in:
lib/libusb/bos.rb

Overview

A structure representing the USB 2.0 Extension descriptor This descriptor is documented in section 9.6.2.1 of the USB 3.0 specification. All multiple-byte fields are represented in host-endian format.

Instance Method Summary collapse

Methods included from GenericMethods

#bDescriptorType, #bDevCapabilityType, #bLength, #dev_capability_data

Constructor Details

#initialize(ctx, *args) ⇒ Usb20Extension

Returns a new instance of Usb20Extension.



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# File 'lib/libusb/bos.rb', line 78

def initialize(ctx, *args)
  super(*args)

  register_context(ctx, :libusb_free_usb_2_0_extension_descriptor)
end

Instance Method Details

#bm_lpm_support? ⇒ Boolean

Returns Supports Link Power Management (LPM).

Returns:

  • (Boolean) —

    Supports Link Power Management (LPM)



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# File 'lib/libusb/bos.rb', line 93

def bm_lpm_support?
  (bmAttributes & BM_LPM_SUPPORT) != 0
end

#bmAttributes ⇒ Object

Bitmap encoding of supported device level features. A value of one in a bit location indicates a feature is supported; a value of zero indicates it is not supported.

See Also:



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# File 'lib/libusb/bos.rb', line 88

def bmAttributes
  self[:bmAttributes]
end

#inspect ⇒ Object 



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# File 'lib/libusb/bos.rb', line 97

def inspect
  attrs = Call::Usb20ExtensionAttributes.to_h.map do |k, v|
    (bmAttributes & v) ? k.to_s : nil
  end
  "\#<#{self.class} #{attrs.compact.join(",")}>"
end