336 lines
12 KiB
C
336 lines
12 KiB
C
/* SPDX-License-Identifier: MIT */
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/*
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* Copyright 2020 Noralf Trønnes
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*/
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#ifndef __LINUX_GUD_H
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#define __LINUX_GUD_H
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#include <linux/types.h>
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/*
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* struct gud_display_descriptor_req - Display descriptor
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* @magic: Magic value GUD_DISPLAY_MAGIC
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* @version: Protocol version
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* @flags: Flags
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* - STATUS_ON_SET: Always do a status request after a SET request.
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* This is used by the Linux gadget driver since it has
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* no way to control the status stage of a control OUT
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* request that has a payload.
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* - FULL_UPDATE: Always send the entire framebuffer when flushing changes.
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* The GUD_REQ_SET_BUFFER request will not be sent
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* before each bulk transfer, it will only be sent if the
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* previous bulk transfer had failed. This gives the device
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* a chance to reset its state machine if needed.
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* This flag can not be used in combination with compression.
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* @compression: Supported compression types
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* - GUD_COMPRESSION_LZ4: LZ4 lossless compression.
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* @max_buffer_size: Maximum buffer size the device can handle (optional).
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* This is useful for devices that don't have a big enough
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* buffer to decompress the entire framebuffer in one go.
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* @min_width: Minimum pixel width the controller can handle
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* @max_width: Maximum width
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* @min_height: Minimum height
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* @max_height: Maximum height
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*
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* Devices that have only one display mode will have min_width == max_width
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* and min_height == max_height.
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*/
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struct gud_display_descriptor_req {
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__le32 magic;
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#define GUD_DISPLAY_MAGIC 0x1d50614d
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__u8 version;
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__le32 flags;
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#define GUD_DISPLAY_FLAG_STATUS_ON_SET BIT(0)
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#define GUD_DISPLAY_FLAG_FULL_UPDATE BIT(1)
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__u8 compression;
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#define GUD_COMPRESSION_LZ4 BIT(0)
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__le32 max_buffer_size;
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__le32 min_width;
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__le32 max_width;
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__le32 min_height;
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__le32 max_height;
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} __packed;
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/*
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* struct gud_property_req - Property
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* @prop: Property
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* @val: Value
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*/
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struct gud_property_req {
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__le16 prop;
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__le64 val;
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} __packed;
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/*
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* struct gud_display_mode_req - Display mode
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* @clock: Pixel clock in kHz
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* @hdisplay: Horizontal display size
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* @hsync_start: Horizontal sync start
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* @hsync_end: Horizontal sync end
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* @htotal: Horizontal total size
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* @vdisplay: Vertical display size
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* @vsync_start: Vertical sync start
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* @vsync_end: Vertical sync end
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* @vtotal: Vertical total size
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* @flags: Bits 0-13 are the same as in the RandR protocol and also what DRM uses.
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* The deprecated bits are reused for internal protocol flags leaving us
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* free to follow DRM for the other bits in the future.
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* - FLAG_PREFERRED: Set on the preferred display mode.
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*/
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struct gud_display_mode_req {
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__le32 clock;
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__le16 hdisplay;
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__le16 hsync_start;
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__le16 hsync_end;
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__le16 htotal;
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__le16 vdisplay;
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__le16 vsync_start;
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__le16 vsync_end;
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__le16 vtotal;
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__le32 flags;
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#define GUD_DISPLAY_MODE_FLAG_PHSYNC BIT(0)
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#define GUD_DISPLAY_MODE_FLAG_NHSYNC BIT(1)
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#define GUD_DISPLAY_MODE_FLAG_PVSYNC BIT(2)
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#define GUD_DISPLAY_MODE_FLAG_NVSYNC BIT(3)
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#define GUD_DISPLAY_MODE_FLAG_INTERLACE BIT(4)
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#define GUD_DISPLAY_MODE_FLAG_DBLSCAN BIT(5)
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#define GUD_DISPLAY_MODE_FLAG_CSYNC BIT(6)
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#define GUD_DISPLAY_MODE_FLAG_PCSYNC BIT(7)
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#define GUD_DISPLAY_MODE_FLAG_NCSYNC BIT(8)
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#define GUD_DISPLAY_MODE_FLAG_HSKEW BIT(9)
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/* BCast and PixelMultiplex are deprecated */
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#define GUD_DISPLAY_MODE_FLAG_DBLCLK BIT(12)
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#define GUD_DISPLAY_MODE_FLAG_CLKDIV2 BIT(13)
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#define GUD_DISPLAY_MODE_FLAG_USER_MASK \
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(GUD_DISPLAY_MODE_FLAG_PHSYNC | GUD_DISPLAY_MODE_FLAG_NHSYNC | \
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GUD_DISPLAY_MODE_FLAG_PVSYNC | GUD_DISPLAY_MODE_FLAG_NVSYNC | \
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GUD_DISPLAY_MODE_FLAG_INTERLACE | GUD_DISPLAY_MODE_FLAG_DBLSCAN | \
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GUD_DISPLAY_MODE_FLAG_CSYNC | GUD_DISPLAY_MODE_FLAG_PCSYNC | \
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GUD_DISPLAY_MODE_FLAG_NCSYNC | GUD_DISPLAY_MODE_FLAG_HSKEW | \
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GUD_DISPLAY_MODE_FLAG_DBLCLK | GUD_DISPLAY_MODE_FLAG_CLKDIV2)
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/* Internal protocol flags */
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#define GUD_DISPLAY_MODE_FLAG_PREFERRED BIT(10)
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} __packed;
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/*
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* struct gud_connector_descriptor_req - Connector descriptor
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* @connector_type: Connector type (GUD_CONNECTOR_TYPE_*).
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* If the host doesn't support the type it should fall back to PANEL.
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* @flags: Flags
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* - POLL_STATUS: Connector status can change (polled every 10 seconds)
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* - INTERLACE: Interlaced modes are supported
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* - DOUBLESCAN: Doublescan modes are supported
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*/
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struct gud_connector_descriptor_req {
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__u8 connector_type;
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#define GUD_CONNECTOR_TYPE_PANEL 0
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#define GUD_CONNECTOR_TYPE_VGA 1
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#define GUD_CONNECTOR_TYPE_COMPOSITE 2
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#define GUD_CONNECTOR_TYPE_SVIDEO 3
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#define GUD_CONNECTOR_TYPE_COMPONENT 4
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#define GUD_CONNECTOR_TYPE_DVI 5
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#define GUD_CONNECTOR_TYPE_DISPLAYPORT 6
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#define GUD_CONNECTOR_TYPE_HDMI 7
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__le32 flags;
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#define GUD_CONNECTOR_FLAGS_POLL_STATUS BIT(0)
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#define GUD_CONNECTOR_FLAGS_INTERLACE BIT(1)
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#define GUD_CONNECTOR_FLAGS_DOUBLESCAN BIT(2)
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} __packed;
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/*
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* struct gud_set_buffer_req - Set buffer transfer info
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* @x: X position of rectangle
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* @y: Y position
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* @width: Pixel width of rectangle
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* @height: Pixel height
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* @length: Buffer length in bytes
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* @compression: Transfer compression
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* @compressed_length: Compressed buffer length
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*
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* This request is issued right before the bulk transfer.
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* @x, @y, @width and @height specifies the rectangle where the buffer should be
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* placed inside the framebuffer.
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*/
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struct gud_set_buffer_req {
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__le32 x;
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__le32 y;
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__le32 width;
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__le32 height;
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__le32 length;
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__u8 compression;
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__le32 compressed_length;
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} __packed;
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/*
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* struct gud_state_req - Display state
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* @mode: Display mode
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* @format: Pixel format GUD_PIXEL_FORMAT_*
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* @connector: Connector index
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* @properties: Array of properties
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*
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* The entire state is transferred each time there's a change.
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*/
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struct gud_state_req {
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struct gud_display_mode_req mode;
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__u8 format;
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__u8 connector;
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struct gud_property_req properties[];
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} __packed;
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/* List of supported connector properties: */
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/* Margins in pixels to deal with overscan, range 0-100 */
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#define GUD_PROPERTY_TV_LEFT_MARGIN 1
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#define GUD_PROPERTY_TV_RIGHT_MARGIN 2
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#define GUD_PROPERTY_TV_TOP_MARGIN 3
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#define GUD_PROPERTY_TV_BOTTOM_MARGIN 4
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#define GUD_PROPERTY_TV_MODE 5
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/* Brightness in percent, range 0-100 */
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#define GUD_PROPERTY_TV_BRIGHTNESS 6
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/* Contrast in percent, range 0-100 */
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#define GUD_PROPERTY_TV_CONTRAST 7
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/* Flicker reduction in percent, range 0-100 */
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#define GUD_PROPERTY_TV_FLICKER_REDUCTION 8
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/* Overscan in percent, range 0-100 */
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#define GUD_PROPERTY_TV_OVERSCAN 9
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/* Saturation in percent, range 0-100 */
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#define GUD_PROPERTY_TV_SATURATION 10
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/* Hue in percent, range 0-100 */
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#define GUD_PROPERTY_TV_HUE 11
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/*
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* Backlight brightness is in the range 0-100 inclusive. The value represents the human perceptual
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* brightness and not a linear PWM value. 0 is minimum brightness which should not turn the
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* backlight completely off. The DPMS connector property should be used to control power which will
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* trigger a GUD_REQ_SET_DISPLAY_ENABLE request.
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*
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* This does not map to a DRM property, it is used with the backlight device.
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*/
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#define GUD_PROPERTY_BACKLIGHT_BRIGHTNESS 12
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/* List of supported properties that are not connector propeties: */
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/*
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* Plane rotation. Should return the supported bitmask on
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* GUD_REQ_GET_PROPERTIES. GUD_ROTATION_0 is mandatory.
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*
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* Note: This is not display rotation so 90/270 will need scaling to make it fit (unless squared).
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*/
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#define GUD_PROPERTY_ROTATION 50
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#define GUD_ROTATION_0 BIT(0)
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#define GUD_ROTATION_90 BIT(1)
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#define GUD_ROTATION_180 BIT(2)
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#define GUD_ROTATION_270 BIT(3)
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#define GUD_ROTATION_REFLECT_X BIT(4)
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#define GUD_ROTATION_REFLECT_Y BIT(5)
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#define GUD_ROTATION_MASK (GUD_ROTATION_0 | GUD_ROTATION_90 | \
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GUD_ROTATION_180 | GUD_ROTATION_270 | \
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GUD_ROTATION_REFLECT_X | GUD_ROTATION_REFLECT_Y)
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/* USB Control requests: */
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/* Get status from the last GET/SET control request. Value is u8. */
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#define GUD_REQ_GET_STATUS 0x00
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/* Status values: */
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#define GUD_STATUS_OK 0x00
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#define GUD_STATUS_BUSY 0x01
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#define GUD_STATUS_REQUEST_NOT_SUPPORTED 0x02
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#define GUD_STATUS_PROTOCOL_ERROR 0x03
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#define GUD_STATUS_INVALID_PARAMETER 0x04
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#define GUD_STATUS_ERROR 0x05
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/* Get display descriptor as a &gud_display_descriptor_req */
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#define GUD_REQ_GET_DESCRIPTOR 0x01
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/* Get supported pixel formats as a byte array of GUD_PIXEL_FORMAT_* */
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#define GUD_REQ_GET_FORMATS 0x40
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#define GUD_FORMATS_MAX_NUM 32
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#define GUD_PIXEL_FORMAT_R1 0x01 /* 1-bit monochrome */
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#define GUD_PIXEL_FORMAT_R8 0x08 /* 8-bit greyscale */
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#define GUD_PIXEL_FORMAT_XRGB1111 0x20
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#define GUD_PIXEL_FORMAT_RGB332 0x30
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#define GUD_PIXEL_FORMAT_RGB565 0x40
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#define GUD_PIXEL_FORMAT_RGB888 0x50
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#define GUD_PIXEL_FORMAT_XRGB8888 0x80
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#define GUD_PIXEL_FORMAT_ARGB8888 0x81
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/*
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* Get supported properties that are not connector propeties as a &gud_property_req array.
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* gud_property_req.val often contains the initial value for the property.
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*/
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#define GUD_REQ_GET_PROPERTIES 0x41
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#define GUD_PROPERTIES_MAX_NUM 32
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/* Connector requests have the connector index passed in the wValue field */
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/* Get connector descriptors as an array of &gud_connector_descriptor_req */
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#define GUD_REQ_GET_CONNECTORS 0x50
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#define GUD_CONNECTORS_MAX_NUM 32
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/*
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* Get properties supported by the connector as a &gud_property_req array.
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* gud_property_req.val often contains the initial value for the property.
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*/
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#define GUD_REQ_GET_CONNECTOR_PROPERTIES 0x51
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#define GUD_CONNECTOR_PROPERTIES_MAX_NUM 32
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/*
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* Issued when there's a TV_MODE property present.
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* Gets an array of the supported TV_MODE names each entry of length
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* GUD_CONNECTOR_TV_MODE_NAME_LEN. Names must be NUL-terminated.
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*/
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#define GUD_REQ_GET_CONNECTOR_TV_MODE_VALUES 0x52
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#define GUD_CONNECTOR_TV_MODE_NAME_LEN 16
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#define GUD_CONNECTOR_TV_MODE_MAX_NUM 16
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/* When userspace checks connector status, this is issued first, not used for poll requests. */
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#define GUD_REQ_SET_CONNECTOR_FORCE_DETECT 0x53
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/*
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* Get connector status. Value is u8.
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*
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* Userspace will get a HOTPLUG uevent if one of the following is true:
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* - Connection status has changed since last
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* - CHANGED is set
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*/
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#define GUD_REQ_GET_CONNECTOR_STATUS 0x54
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#define GUD_CONNECTOR_STATUS_DISCONNECTED 0x00
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#define GUD_CONNECTOR_STATUS_CONNECTED 0x01
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#define GUD_CONNECTOR_STATUS_UNKNOWN 0x02
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#define GUD_CONNECTOR_STATUS_CONNECTED_MASK 0x03
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#define GUD_CONNECTOR_STATUS_CHANGED BIT(7)
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/*
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* Display modes can be fetched as either EDID data or an array of &gud_display_mode_req.
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*
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* If GUD_REQ_GET_CONNECTOR_MODES returns zero, EDID is used to create display modes.
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* If both display modes and EDID are returned, EDID is just passed on to userspace
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* in the EDID connector property.
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*/
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/* Get &gud_display_mode_req array of supported display modes */
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#define GUD_REQ_GET_CONNECTOR_MODES 0x55
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#define GUD_CONNECTOR_MAX_NUM_MODES 128
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/* Get Extended Display Identification Data */
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#define GUD_REQ_GET_CONNECTOR_EDID 0x56
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#define GUD_CONNECTOR_MAX_EDID_LEN 2048
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/* Set buffer properties before bulk transfer as &gud_set_buffer_req */
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#define GUD_REQ_SET_BUFFER 0x60
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/* Check display configuration as &gud_state_req */
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#define GUD_REQ_SET_STATE_CHECK 0x61
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/* Apply the previous STATE_CHECK configuration */
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#define GUD_REQ_SET_STATE_COMMIT 0x62
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/* Enable/disable the display controller, value is u8: 0/1 */
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#define GUD_REQ_SET_CONTROLLER_ENABLE 0x63
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/* Enable/disable display/output (DPMS), value is u8: 0/1 */
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#define GUD_REQ_SET_DISPLAY_ENABLE 0x64
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#endif
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