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