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/* 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_rect;
struct spi_device;
struct gpio_desc;
struct regulator;
/**
* struct mipi_dbi - MIPI DBI interface
*/
struct mipi_dbi {
/**
* @cmdlock: Command lock
*/
struct mutex cmdlock;
/**
* @command: Bus specific callback executing commands.
*/
int (*command)(struct mipi_dbi *dbi, u8 *cmd, u8 *param, size_t num);
/**
* @read_commands: Array of read commands terminated by a zero entry.
* Reading is disabled if this is NULL.
*/
const u8 *read_commands;
/**
* @swap_bytes: Swap bytes in buffer before transfer
*/
bool swap_bytes;
/**
* @reset: Optional reset gpio
*/
struct gpio_desc *reset;
/* Type C specific */
/**
* @spi: SPI device
*/
struct spi_device *spi;
/**
* @dc: Optional D/C gpio.
*/
struct gpio_desc *dc;
/**
* @tx_buf9: Buffer used for Option 1 9-bit conversion
*/
void *tx_buf9;
/**
* @tx_buf9_len: Size of tx_buf9.
*/
size_t tx_buf9_len;
};
/**
* struct mipi_dbi_dev - MIPI DBI device
*/
struct mipi_dbi_dev {
/**
* @drm: DRM device
*/
struct drm_device drm;
/**
* @pipe: Display pipe structure
*/
struct drm_simple_display_pipe pipe;
/**
* @connector: Connector
*/
struct drm_connector connector;
/**
* @mode: Fixed display mode
*/
struct drm_display_mode mode;
/**
* @tx_buf: Buffer used for transfer (copy clip rect area)
*/
u16 *tx_buf;
/**
* @rotation: initial rotation in degrees Counter Clock Wise
*/
unsigned int rotation;
/**
* @left_offset: Horizontal offset of the display relative to the
* controller's driver array
*/
unsigned int left_offset;
/**
* @top_offset: Vertical offset of the display relative to the
* controller's driver array
*/
unsigned int top_offset;
/**
* @backlight: backlight device (optional)
*/
struct backlight_device *backlight;
/**
* @regulator: power regulator (optional)
*/
struct regulator *regulator;
/**
* @dbi: MIPI DBI interface
*/
struct mipi_dbi dbi;
/**
* @driver_private: Driver private data.
* Necessary for drivers with private data since devm_drm_dev_alloc()
* can't allocate structures that embed a structure which then again
* embeds drm_device.
*/
void *driver_private;
};
static inline struct mipi_dbi_dev *drm_to_mipi_dbi_dev(struct drm_device *drm)
{
return container_of(drm, struct mipi_dbi_dev, 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);
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);
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 drm_framebuffer *fb,
struct drm_rect *clip, bool swap);
/**
* 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...) \
({ \
const u8 d[] = { seq }; \
struct device *dev = &(dbi)->spi->dev; \
int ret; \
ret = mipi_dbi_command_stackbuf(dbi, cmd, d, ARRAY_SIZE(d)); \
if (ret) \
dev_err_ratelimited(dev, "error %d when sending command %#02x\n", ret, cmd); \
ret; \
})
#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
#endif /* __LINUX_MIPI_DBI_H */
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