/* SPDX-License-Identifier: GPL-2.0 */
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/*
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* Broadcom BM2835 V4L2 driver
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*
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* Copyright © 2013 Raspberry Pi (Trading) Ltd.
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*
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* Authors: Vincent Sanders @ Collabora
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* Dave Stevenson @ Broadcom
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* (now dave.stevenson@raspberrypi.org)
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* Simon Mellor @ Broadcom
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* Luke Diamand @ Broadcom
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*/
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/* MMAL_PORT_TYPE_T */
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enum mmal_port_type {
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MMAL_PORT_TYPE_UNKNOWN = 0, /* Unknown port type */
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MMAL_PORT_TYPE_CONTROL, /* Control port */
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MMAL_PORT_TYPE_INPUT, /* Input port */
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MMAL_PORT_TYPE_OUTPUT, /* Output port */
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MMAL_PORT_TYPE_CLOCK, /* Clock port */
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};
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/* The port is pass-through and doesn't need buffer headers allocated */
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#define MMAL_PORT_CAPABILITY_PASSTHROUGH 0x01
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/*
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*The port wants to allocate the buffer payloads.
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* This signals a preference that payload allocation should be done
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* on this port for efficiency reasons.
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*/
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#define MMAL_PORT_CAPABILITY_ALLOCATION 0x02
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/*
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* The port supports format change events.
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* This applies to input ports and is used to let the client know
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* whether the port supports being reconfigured via a format
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* change event (i.e. without having to disable the port).
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*/
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#define MMAL_PORT_CAPABILITY_SUPPORTS_EVENT_FORMAT_CHANGE 0x04
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/*
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* mmal port structure (MMAL_PORT_T)
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*
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* most elements are informational only, the pointer values for
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* interogation messages are generally provided as additional
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* structures within the message. When used to set values only the
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* buffer_num, buffer_size and userdata parameters are writable.
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*/
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struct mmal_port {
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u32 priv; /* Private member used by the framework */
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u32 name; /* Port name. Used for debugging purposes (RO) */
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u32 type; /* Type of the port (RO) enum mmal_port_type */
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u16 index; /* Index of the port in its type list (RO) */
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u16 index_all; /* Index of the port in the list of all ports (RO) */
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u32 is_enabled; /* Indicates whether the port is enabled or not (RO) */
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u32 format; /* Format of the elementary stream */
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u32 buffer_num_min; /* Minimum number of buffers the port
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* requires (RO). This is set by the
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* component.
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*/
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u32 buffer_size_min; /* Minimum size of buffers the port
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* requires (RO). This is set by the
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* component.
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*/
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u32 buffer_alignment_min;/* Minimum alignment requirement for
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* the buffers (RO). A value of
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* zero means no special alignment
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* requirements. This is set by the
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* component.
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*/
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u32 buffer_num_recommended; /* Number of buffers the port
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* recommends for optimal
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* performance (RO). A value of
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* zero means no special
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* recommendation. This is set
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* by the component.
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*/
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u32 buffer_size_recommended; /* Size of buffers the port
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* recommends for optimal
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* performance (RO). A value of
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* zero means no special
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* recommendation. This is set
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* by the component.
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*/
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u32 buffer_num; /* Actual number of buffers the port will use.
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* This is set by the client.
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*/
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u32 buffer_size; /* Actual maximum size of the buffers that
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* will be sent to the port. This is set by
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* the client.
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*/
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u32 component; /* Component this port belongs to (Read Only) */
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u32 userdata; /* Field reserved for use by the client */
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u32 capabilities; /* Flags describing the capabilities of a
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* port (RO). Bitwise combination of \ref
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* portcapabilities "Port capabilities"
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* values.
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*/
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};
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