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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/types.h>
#include <spi/spi.h>
#include <driver.h>
struct regulator;
struct fb_videomode;
/**
* struct mipi_dbi - MIPI DBI interface
*/
struct mipi_dbi {
/**
* @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
*/
int reset;
/* Type C specific */
/**
* @spi: SPI device
*/
struct spi_device *spi;
/**
* @dc: Optional D/C gpio.
*/
int dc;
struct list_head list;
};
static inline const char *mipi_dbi_name(struct mipi_dbi *dbi)
{
return dev_name(&dbi->spi->dev);
}
int mipi_dbi_spi_init(struct spi_device *spi, struct mipi_dbi *dbi,
int dc);
void mipi_dbi_hw_reset(struct mipi_dbi *dbi);
bool mipi_dbi_display_is_on(struct mipi_dbi *dbi);
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);
/**
* 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_d *dev = &(dbi)->spi->dev; \
int ret; \
ret = mipi_dbi_command_stackbuf(dbi, cmd, d, ARRAY_SIZE(d)); \
if (ret) \
dev_err(dev, "error %pe when sending command %#02x\n", ERR_PTR(ret), cmd); \
ret; \
})
bool mipi_dbi_command_is_read(struct mipi_dbi *dbi, u8 cmd);
int mipi_dbi_command_read_len(int cmd);
extern struct list_head mipi_dbi_list;
#endif /* __LINUX_MIPI_DBI_H */
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