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/**
* @file fb_vesa.h
*
* @ingroup i386_pc386
*
* @brief Headers specific for framebuffer drivers utilizing VESA VBE.
*/
/*
* Copyright (C) 2014 Jan Doležal (dolezj21@fel.cvut.cz)
* CTU in Prague.
*
* The license and distribution terms for this file may be
* found in the file LICENSE in this distribution or at
* http://www.rtems.org/license/LICENSE.
*/
#include <bsp/vbe3.h>
#include <edid.h>
#ifndef _FB_VESA_H
#define _FB_VESA_H
#ifndef ASM /* ASM */
#include <stdint.h>
#ifdef __cplusplus
extern "C" {
#endif /* __cplusplus */
/* ----- Prototypes ----- */
/**
* @brief Returns information about graphic's controller in the \p info_block
* structure.
*
* @param[out] info_block pointer to the struct to be filled with
* controller information
* @param[in] queried_VBE_Version if >0x200 then video bios is asked to fill in
* parameters which appeared with second version
* of VBE.
* @retval ax register content as defined in VBE RETURN STATUS paragraph
* @retval -1 error calling graphical bios
*/
uint32_t VBE_controller_information (
VBE_vbe_info_block *info_block,
uint16_t queried_VBE_Version
);
/**
* @brief Fills structure \p info_block with informations about selected mode in
* \p mode_number variable.
*
* @param[out] info_block pointer to the struct to be filled with
* mode information
* @param[in] mode_number detailes of this mode to be filled
* @retval ax register content as defined in VBE RETURN STATUS paragraph
* @retval -1 error calling graphical bios
*/
uint32_t VBE_mode_information (
VBE_mode_info_block *info_block,
uint16_t mode_number
);
/**
* @brief Sets graphics mode selected. If mode has refreshRateCtrl bit set, than
* the \p info_block must be filled accordingly.
*
* @param[in] mode_number number of mode to be set
* @param[in] info_block pointer to struct containing refresh rate control info
* @retval ax register content as defined in VBE RETURN STATUS paragraph
* @retval -1 error calling graphical bios
*/
uint32_t VBE_set_mode (
uint16_t mode_number,
VBE_CRTC_info_block *info_block
);
/**
* @brief Get currently set mode number.
*
* @param[out] mode_number variable to be filled with current mode number
* @retval ax register content as defined in VBE RETURN STATUS paragraph
* @retval -1 error calling graphical bios
*/
uint32_t VBE_current_mode (
uint16_t *mode_number
);
/**
* @brief Gets information about display data channel implemented in the
* graphic's controller.
*
* @param[in] controller_unit_number
* @param[out] seconds_to_transfer_EDID_block approximate time to transfer one
* EDID block rounded up to seconds
* @param[out] DDC_level_supported contains DDC version supported and
* screen blanking state during transfer
* @retval ax register content as defined in VBE RETURN STATUS paragraph
* @retval -1 error calling graphical bios
*/
uint32_t VBE_report_DDC_capabilities (
uint16_t controller_unit_number,
uint8_t *seconds_to_transfer_EDID_block,
uint8_t *DDC_level_supported
);
/**
* @brief Reads selected EDID block from display attached to controller's
* interface.
*
* @param[in] controller_unit_number
* @param[in] EDID_block_number block no. to be read from the display
* @param[out] buffer place to store block fetched from the display
* @retval ax register content as defined in VBE RETURN STATUS paragraph
* @retval -1 error calling graphical bios
*/
uint32_t VBE_read_EDID (
uint16_t controller_unit_number,
uint16_t EDID_block_number,
EDID_edid1 *buffer
);
#ifdef __cplusplus
}
#endif /* __cplusplus */
#endif /* ASM */
#endif /* _FB_VESA_H */
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