linux/include/drm/drm_mipi_dbi.h

/* SPDX-License-Identifier: GPL-2.0-or-later */
/*
 * MIPI Display Bus Interface (DBI) LCD controller support
 *
 * Copyright 2016 Noralf Trønnes
 */

#ifndef __LINUX_MIPI_DBI_H
#define __LINUX_MIPI_DBI_H

#include <linux/mutex.h>
#include <drm/drm_device.h>
#include <drm/drm_simple_kms_helper.h>

struct drm_format_conv_state;
struct drm_rect;
struct gpio_desc;
struct iosys_map;
struct regulator;
struct spi_device;

/**
 * struct mipi_dbi - MIPI DBI interface
 */
struct mipi_dbi { … };

/**
 * struct mipi_dbi_dev - MIPI DBI device
 */
struct mipi_dbi_dev { … };

static inline struct mipi_dbi_dev *drm_to_mipi_dbi_dev(struct drm_device *drm)
{ … }

int mipi_dbi_spi_init(struct spi_device *spi, struct mipi_dbi *dbi,
		      struct gpio_desc *dc);
int mipi_dbi_dev_init_with_formats(struct mipi_dbi_dev *dbidev,
				   const struct drm_simple_display_pipe_funcs *funcs,
				   const uint32_t *formats, unsigned int format_count,
				   const struct drm_display_mode *mode,
				   unsigned int rotation, size_t tx_buf_size);
int mipi_dbi_dev_init(struct mipi_dbi_dev *dbidev,
		      const struct drm_simple_display_pipe_funcs *funcs,
		      const struct drm_display_mode *mode, unsigned int rotation);
enum drm_mode_status mipi_dbi_pipe_mode_valid(struct drm_simple_display_pipe *pipe,
					      const struct drm_display_mode *mode);
void mipi_dbi_pipe_update(struct drm_simple_display_pipe *pipe,
			  struct drm_plane_state *old_state);
void mipi_dbi_enable_flush(struct mipi_dbi_dev *dbidev,
			   struct drm_crtc_state *crtc_state,
			   struct drm_plane_state *plan_state);
void mipi_dbi_pipe_disable(struct drm_simple_display_pipe *pipe);
int mipi_dbi_pipe_begin_fb_access(struct drm_simple_display_pipe *pipe,
				  struct drm_plane_state *plane_state);
void mipi_dbi_pipe_end_fb_access(struct drm_simple_display_pipe *pipe,
				 struct drm_plane_state *plane_state);
void mipi_dbi_pipe_reset_plane(struct drm_simple_display_pipe *pipe);
struct drm_plane_state *mipi_dbi_pipe_duplicate_plane_state(struct drm_simple_display_pipe *pipe);
void mipi_dbi_pipe_destroy_plane_state(struct drm_simple_display_pipe *pipe,
				       struct drm_plane_state *plane_state);

void mipi_dbi_hw_reset(struct mipi_dbi *dbi);
bool mipi_dbi_display_is_on(struct mipi_dbi *dbi);
int mipi_dbi_poweron_reset(struct mipi_dbi_dev *dbidev);
int mipi_dbi_poweron_conditional_reset(struct mipi_dbi_dev *dbidev);

u32 mipi_dbi_spi_cmd_max_speed(struct spi_device *spi, size_t len);
int mipi_dbi_spi_transfer(struct spi_device *spi, u32 speed_hz,
			  u8 bpw, const void *buf, size_t len);

int mipi_dbi_command_read(struct mipi_dbi *dbi, u8 cmd, u8 *val);
int mipi_dbi_command_buf(struct mipi_dbi *dbi, u8 cmd, u8 *data, size_t len);
int mipi_dbi_command_stackbuf(struct mipi_dbi *dbi, u8 cmd, const u8 *data,
			      size_t len);
int mipi_dbi_buf_copy(void *dst, struct iosys_map *src, struct drm_framebuffer *fb,
		      struct drm_rect *clip, bool swap,
		      struct drm_format_conv_state *fmtcnv_state);

/**
 * mipi_dbi_command - MIPI DCS command with optional parameter(s)
 * @dbi: MIPI DBI structure
 * @cmd: Command
 * @seq: Optional parameter(s)
 *
 * Send MIPI DCS command to the controller. Use mipi_dbi_command_read() for
 * get/read.
 *
 * Returns:
 * Zero on success, negative error code on failure.
 */
#define mipi_dbi_command(dbi, cmd, seq...) …

#ifdef CONFIG_DEBUG_FS
void mipi_dbi_debugfs_init(struct drm_minor *minor);
#else
static inline void mipi_dbi_debugfs_init(struct drm_minor *minor) {}
#endif

/**
 * DRM_MIPI_DBI_SIMPLE_DISPLAY_PIPE_FUNCS - Initializes struct drm_simple_display_pipe_funcs
 *                                          for MIPI-DBI devices
 * @enable_: Enable-callback implementation
 *
 * This macro initializes struct drm_simple_display_pipe_funcs with default
 * values for MIPI-DBI-based devices. The only callback that depends on the
 * hardware is @enable, for which the driver has to provide an implementation.
 * MIPI-based drivers are encouraged to use this macro for initialization.
 */
#define DRM_MIPI_DBI_SIMPLE_DISPLAY_PIPE_FUNCS(enable_) …

#endif /* __LINUX_MIPI_DBI_H */