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