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Class and Core Layers Interaction through Callbacks
Request type
Callback
Request
Mandatory? / Note
Standard
Conn()
SET_CONFIGURATION
Yes / Host selects a non-null configuration
7
number.
Standard
Disconn()
SET_CONFIGURATION
Yes / Host resets the current configuration or
device physically detached from host.
Standard
UpdateAltSetting()
SET_INTERFACE
No / Callback skipped if no alternate
settings are defined for one or more
interfaces.
Standard
Standard
UpdateEPState()
IFDesc()
SET_FEATURE
CLEAR_FEATURE
GET_DESCRIPTOR
No / Callback skipped if the state of the
endpoint is not used.
No / Callback skipped if no class-specific
descriptors for one or more interfaces.
Standard
IFDescGetSize()
GET_DESCRIPTOR
No / Callback skipped if no class-specific
descriptors for one or more interfaces.
Standard
EPDesc()
GET_DESCRIPTOR
No / Callback skipped if no class-specific
descriptors for one or more endpoints.
Standard
EPDescGetSize()
GET_DESCRIPTOR
No / Callback skipped if no class-specific
descriptors for one or more endpoints.
Standard
IFReq()
GET_DESCRIPTOR
No / Callback skipped if no standard
descriptors provided by a class.
Class
ClassReq()
-
No / Callback skipped if no class-specific
requests defined by the class specification.
Vendor
VendorReq()
-
No / Callback skipped if no vendor requests.
Table 7-2 Class Callbacks and Requests Mapping
113
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