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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