drivers/display/ssd1306.c - third_party/github/zephyrproject-rtos/zephyr - Git at Google

 /*
  * Copyright (c) 2018 PHYTEC Messtechnik GmbH
  *
  * SPDX-License-Identifier: Apache-2.0
  */

 #define DT_DRV_COMPAT solomon_ssd1306fb

 #include <zephyr/logging/log.h>
 LOG_MODULE_REGISTER(ssd1306, CONFIG_DISPLAY_LOG_LEVEL);

 #include <string.h>
 #include <zephyr/device.h>
 #include <zephyr/init.h>
 #include <zephyr/drivers/gpio.h>
 #include <zephyr/drivers/i2c.h>
 #include <zephyr/drivers/spi.h>
 #include <zephyr/kernel.h>

 #include "ssd1306_regs.h"
 #include <zephyr/display/cfb.h>

 #if DT_INST_PROP(0, segment_remap) == 1
 #define SSD1306_PANEL_SEGMENT_REMAP	true
 #else
 #define SSD1306_PANEL_SEGMENT_REMAP	false
 #endif

 #if DT_INST_PROP(0, com_invdir) == 1
 #define SSD1306_PANEL_COM_INVDIR	true
 #else
 #define SSD1306_PANEL_COM_INVDIR	false
 #endif

 #if DT_INST_PROP(0, com_sequential) == 1
 #define SSD1306_COM_PINS_HW_CONFIG	SSD1306_SET_PADS_HW_SEQUENTIAL
 #else
 #define SSD1306_COM_PINS_HW_CONFIG	SSD1306_SET_PADS_HW_ALTERNATIVE
 #endif

 #define SSD1306_PANEL_NUMOF_PAGES	(DT_INST_PROP(0, height) / 8)
 #define SSD1306_CLOCK_DIV_RATIO		0x0
 #define SSD1306_CLOCK_FREQUENCY		0x8
 #define SSD1306_PANEL_VCOM_DESEL_LEVEL	0x20
 #define SSD1306_PANEL_PUMP_VOLTAGE	SSD1306_SET_PUMP_VOLTAGE_90

 #ifndef SSD1306_ADDRESSING_MODE
 #define SSD1306_ADDRESSING_MODE		(SSD1306_SET_MEM_ADDRESSING_HORIZONTAL)
 #endif

 struct ssd1306_config {
 #if DT_INST_ON_BUS(0, i2c)
 	struct i2c_dt_spec bus;
 #elif DT_INST_ON_BUS(0, spi)
 	struct spi_dt_spec bus;
 	struct gpio_dt_spec data_cmd;
 #endif
 	struct gpio_dt_spec reset;
 };

 struct ssd1306_data {
 	uint8_t contrast;
 	uint8_t scan_mode;
 };

 #if DT_INST_ON_BUS(0, i2c)

 static inline bool ssd1306_bus_ready(const struct device *dev)
 {
 	const struct ssd1306_config *config = dev->config;

 	return device_is_ready(config->bus.bus);
 }

 static inline int ssd1306_write_bus(const struct device *dev,
 				    uint8_t *buf, size_t len, bool command)
 {
 	const struct ssd1306_config *config = dev->config;

 	return i2c_burst_write_dt(&config->bus,
 				  command ? SSD1306_CONTROL_ALL_BYTES_CMD :
 				  SSD1306_CONTROL_ALL_BYTES_DATA,
 				  buf, len);
 }

 #elif DT_INST_ON_BUS(0, spi)

 static inline bool ssd1306_bus_ready(const struct device *dev)
 {
 	const struct ssd1306_config *config = dev->config;

 	if (gpio_pin_configure_dt(&config->data_cmd, GPIO_OUTPUT_INACTIVE) < 0) {
 		return false;
 	}

 	return spi_is_ready(&config->bus);
 }

 static inline int ssd1306_write_bus(const struct device *dev,
 				    uint8_t *buf, size_t len, bool command)
 {
 	const struct ssd1306_config *config = dev->config;
 	int errno;

 	gpio_pin_set_dt(&config->data_cmd, command ? 0 : 1);
 	struct spi_buf tx_buf = {
 		.buf = buf,
 		.len = len
 	};

 	struct spi_buf_set tx_bufs = {
 		.buffers = &tx_buf,
 		.count = 1
 	};

 	errno = spi_write_dt(&config->bus, &tx_bufs);

 	return errno;
 }
 #endif

 static inline int ssd1306_set_panel_orientation(const struct device *dev)
 {
 	uint8_t cmd_buf[] = {
 		(SSD1306_PANEL_SEGMENT_REMAP ?
 		 SSD1306_SET_SEGMENT_MAP_REMAPED :
 		 SSD1306_SET_SEGMENT_MAP_NORMAL),
 		(SSD1306_PANEL_COM_INVDIR ?
 		 SSD1306_SET_COM_OUTPUT_SCAN_FLIPPED :
 		 SSD1306_SET_COM_OUTPUT_SCAN_NORMAL)
 	};

 	return ssd1306_write_bus(dev, cmd_buf, sizeof(cmd_buf), true);
 }

 static inline int ssd1306_set_timing_setting(const struct device *dev)
 {
 	uint8_t cmd_buf[] = {
 		SSD1306_SET_CLOCK_DIV_RATIO,
 		(SSD1306_CLOCK_FREQUENCY << 4) | SSD1306_CLOCK_DIV_RATIO,
 		SSD1306_SET_CHARGE_PERIOD,
 		DT_INST_PROP(0, prechargep),
 		SSD1306_SET_VCOM_DESELECT_LEVEL,
 		SSD1306_PANEL_VCOM_DESEL_LEVEL
 	};

 	return ssd1306_write_bus(dev, cmd_buf, sizeof(cmd_buf), true);
 }

 static inline int ssd1306_set_hardware_config(const struct device *dev)
 {
 	uint8_t cmd_buf[] = {
 		SSD1306_SET_START_LINE,
 		SSD1306_SET_DISPLAY_OFFSET,
 		DT_INST_PROP(0, display_offset),
 		SSD1306_SET_PADS_HW_CONFIG,
 		SSD1306_COM_PINS_HW_CONFIG,
 		SSD1306_SET_MULTIPLEX_RATIO,
 		DT_INST_PROP(0, multiplex_ratio)
 	};

 	return ssd1306_write_bus(dev, cmd_buf, sizeof(cmd_buf), true);
 }

 static inline int ssd1306_set_charge_pump(const struct device *dev)
 {
 	uint8_t cmd_buf[] = {
 #if defined(CONFIG_SSD1306_DEFAULT)
 		SSD1306_SET_CHARGE_PUMP_ON,
 		SSD1306_SET_CHARGE_PUMP_ON_ENABLED,
 #endif
 #if defined(CONFIG_SSD1306_SH1106_COMPATIBLE)
 		SH1106_SET_DCDC_MODE,
 		SH1106_SET_DCDC_ENABLED,
 #endif
 		SSD1306_PANEL_PUMP_VOLTAGE,
 	};

 	return ssd1306_write_bus(dev, cmd_buf, sizeof(cmd_buf), true);
 }

 static int ssd1306_resume(const struct device *dev)
 {
 	uint8_t cmd_buf[] = {
 		SSD1306_DISPLAY_ON,
 	};

 	return ssd1306_write_bus(dev, cmd_buf, sizeof(cmd_buf), true);
 }

 static int ssd1306_suspend(const struct device *dev)
 {
 	uint8_t cmd_buf[] = {
 		SSD1306_DISPLAY_OFF,
 	};

 	return ssd1306_write_bus(dev, cmd_buf, sizeof(cmd_buf), true);
 }

 static int ssd1306_write(const struct device *dev, const uint16_t x, const uint16_t y,
 			 const struct display_buffer_descriptor *desc,
 			 const void *buf)
 {
 	size_t buf_len;

 	if (desc->pitch < desc->width) {
 		LOG_ERR("Pitch is smaller then width");
 		return -1;
 	}

 	buf_len = MIN(desc->buf_size, desc->height * desc->width / 8);
 	if (buf == NULL || buf_len == 0U) {
 		LOG_ERR("Display buffer is not available");
 		return -1;
 	}

 	if (desc->pitch > desc->width) {
 		LOG_ERR("Unsupported mode");
 		return -1;
 	}

 	if ((y & 0x7) != 0U) {
 		LOG_ERR("Unsupported origin");
 		return -1;
 	}

 	LOG_DBG("x %u, y %u, pitch %u, width %u, height %u, buf_len %u",
 		x, y, desc->pitch, desc->width, desc->height, buf_len);

 #if defined(CONFIG_SSD1306_DEFAULT)
 	uint8_t cmd_buf[] = {
 		SSD1306_SET_MEM_ADDRESSING_MODE,
 		SSD1306_ADDRESSING_MODE,
 		SSD1306_SET_COLUMN_ADDRESS,
 		x,
 		(x + desc->width - 1),
 		SSD1306_SET_PAGE_ADDRESS,
 		y/8,
 		((y + desc->height)/8 - 1)
 	};

 	if (ssd1306_write_bus(dev, cmd_buf, sizeof(cmd_buf), true)) {
 		LOG_ERR("Failed to write command");
 		return -1;
 	}

 	return ssd1306_write_bus(dev, (uint8_t *)buf, buf_len, false);

 #elif defined(CONFIG_SSD1306_SH1106_COMPATIBLE)
 	uint8_t x_offset = x + DT_INST_PROP(0, segment_offset);
 	uint8_t cmd_buf[] = {
 		SSD1306_SET_LOWER_COL_ADDRESS |
 			(x_offset & SSD1306_SET_LOWER_COL_ADDRESS_MASK),
 		SSD1306_SET_HIGHER_COL_ADDRESS |
 			((x_offset >> 4) & SSD1306_SET_LOWER_COL_ADDRESS_MASK),
 		SSD1306_SET_PAGE_START_ADDRESS | (y / 8)
 	};
 	uint8_t *buf_ptr = (uint8_t *)buf;

 	for (uint8_t n = 0; n < desc->height / 8; n++) {
 		cmd_buf[sizeof(cmd_buf) - 1] =
 			SSD1306_SET_PAGE_START_ADDRESS | (n + (y / 8));
 		LOG_HEXDUMP_DBG(cmd_buf, sizeof(cmd_buf), "cmd_buf");

 		if (ssd1306_write_bus(dev, cmd_buf, sizeof(cmd_buf), true)) {
 			return -1;
 		}

 		if (ssd1306_write_bus(dev, buf_ptr, desc->width, false)) {
 			return -1;
 		}

 		buf_ptr = buf_ptr + desc->width;
 		if (buf_ptr > ((uint8_t *)buf + buf_len)) {
 			LOG_ERR("Exceeded buffer length");
 			return -1;
 		}
 	}
 #endif

 	return 0;
 }

 static int ssd1306_read(const struct device *dev, const uint16_t x,
 			const uint16_t y,
 			const struct display_buffer_descriptor *desc,
 			void *buf)
 {
 	LOG_ERR("Unsupported");
 	return -ENOTSUP;
 }

 static void *ssd1306_get_framebuffer(const struct device *dev)
 {
 	LOG_ERR("Unsupported");
 	return NULL;
 }

 static int ssd1306_set_brightness(const struct device *dev,
 				  const uint8_t brightness)
 {
 	LOG_WRN("Unsupported");
 	return -ENOTSUP;
 }

 static int ssd1306_set_contrast(const struct device *dev, const uint8_t contrast)
 {
 	uint8_t cmd_buf[] = {
 		SSD1306_SET_CONTRAST_CTRL,
 		contrast,
 	};

 	return ssd1306_write_bus(dev, cmd_buf, sizeof(cmd_buf), true);
 }

 static void ssd1306_get_capabilities(const struct device *dev,
 				     struct display_capabilities *caps)
 {
 	memset(caps, 0, sizeof(struct display_capabilities));
 	caps->x_resolution = DT_INST_PROP(0, width);
 	caps->y_resolution = DT_INST_PROP(0, height);
 	caps->supported_pixel_formats = PIXEL_FORMAT_MONO10;
 	caps->current_pixel_format = PIXEL_FORMAT_MONO10;
 	caps->screen_info = SCREEN_INFO_MONO_VTILED;
 }

 static int ssd1306_set_orientation(const struct device *dev,
 				   const enum display_orientation
 				   orientation)
 {
 	LOG_ERR("Unsupported");
 	return -ENOTSUP;
 }

 static int ssd1306_set_pixel_format(const struct device *dev,
 				    const enum display_pixel_format pf)
 {
 	if (pf == PIXEL_FORMAT_MONO10) {
 		return 0;
 	}
 	LOG_ERR("Unsupported");
 	return -ENOTSUP;
 }

 static int ssd1306_init_device(const struct device *dev)
 {
 	const struct ssd1306_config *config = dev->config;

 	uint8_t cmd_buf[] = {
 		SSD1306_SET_ENTIRE_DISPLAY_OFF,
 #ifdef CONFIG_SSD1306_REVERSE_MODE
 		SSD1306_SET_REVERSE_DISPLAY,
 #else
 		SSD1306_SET_NORMAL_DISPLAY,
 #endif
 	};

 	/* Reset if pin connected */
 	if (config->reset.port) {
 		k_sleep(K_MSEC(SSD1306_RESET_DELAY));
 		gpio_pin_set_dt(&config->reset, 1);
 		k_sleep(K_MSEC(SSD1306_RESET_DELAY));
 		gpio_pin_set_dt(&config->reset, 0);
 	}

 	/* Turn display off */
 	if (ssd1306_suspend(dev)) {
 		return -EIO;
 	}

 	if (ssd1306_set_timing_setting(dev)) {
 		return -EIO;
 	}

 	if (ssd1306_set_hardware_config(dev)) {
 		return -EIO;
 	}

 	if (ssd1306_set_panel_orientation(dev)) {
 		return -EIO;
 	}

 	if (ssd1306_set_charge_pump(dev)) {
 		return -EIO;
 	}

 	if (ssd1306_write_bus(dev, cmd_buf, sizeof(cmd_buf), true)) {
 		return -EIO;
 	}

 	if (ssd1306_set_contrast(dev, CONFIG_SSD1306_DEFAULT_CONTRAST)) {
 		return -EIO;
 	}

 	ssd1306_resume(dev);

 	return 0;
 }

 static int ssd1306_init(const struct device *dev)
 {
 	const struct ssd1306_config *config = dev->config;

 	LOG_DBG("");

 	if (!ssd1306_bus_ready(dev)) {
 		LOG_ERR("Bus device %s not ready!", config->bus.bus->name);
 		return -EINVAL;
 	}

 	if (config->reset.port) {
 		int ret;

 		ret = gpio_pin_configure_dt(&config->reset,
 					    GPIO_OUTPUT_INACTIVE);
 		if (ret < 0) {
 			return ret;
 		}
 	}

 	if (ssd1306_init_device(dev)) {
 		LOG_ERR("Failed to initialize device!");
 		return -EIO;
 	}

 	return 0;
 }

 static const struct ssd1306_config ssd1306_config = {
 #if DT_INST_ON_BUS(0, i2c)
 	.bus = I2C_DT_SPEC_INST_GET(0),
 #elif DT_INST_ON_BUS(0, spi)
 	.bus = SPI_DT_SPEC_INST_GET(
 		0, SPI_OP_MODE_MASTER | SPI_TRANSFER_MSB | SPI_WORD_SET(8), 0),
 	.data_cmd = GPIO_DT_SPEC_INST_GET(0, data_cmd_gpios),
 #endif
 	.reset = GPIO_DT_SPEC_INST_GET_OR(0, reset_gpios, { 0 })
 };

 static struct ssd1306_data ssd1306_driver;

 static struct display_driver_api ssd1306_driver_api = {
 	.blanking_on = ssd1306_suspend,
 	.blanking_off = ssd1306_resume,
 	.write = ssd1306_write,
 	.read = ssd1306_read,
 	.get_framebuffer = ssd1306_get_framebuffer,
 	.set_brightness = ssd1306_set_brightness,
 	.set_contrast = ssd1306_set_contrast,
 	.get_capabilities = ssd1306_get_capabilities,
 	.set_pixel_format = ssd1306_set_pixel_format,
 	.set_orientation = ssd1306_set_orientation,
 };

 DEVICE_DT_INST_DEFINE(0, ssd1306_init, NULL,
 		      &ssd1306_driver, &ssd1306_config,
 		      POST_KERNEL, CONFIG_DISPLAY_INIT_PRIORITY,
 		      &ssd1306_driver_api);
	/*
	* Copyright (c) 2018 PHYTEC Messtechnik GmbH
	*
	* SPDX-License-Identifier: Apache-2.0
	*/

	#define DT_DRV_COMPAT solomon_ssd1306fb

	#include <zephyr/logging/log.h>
	LOG_MODULE_REGISTER(ssd1306, CONFIG_DISPLAY_LOG_LEVEL);

	#include <string.h>
	#include <zephyr/device.h>
	#include <zephyr/init.h>
	#include <zephyr/drivers/gpio.h>
	#include <zephyr/drivers/i2c.h>
	#include <zephyr/drivers/spi.h>
	#include <zephyr/kernel.h>

	#include "ssd1306_regs.h"
	#include <zephyr/display/cfb.h>

	#if DT_INST_PROP(0, segment_remap) == 1
	#define SSD1306_PANEL_SEGMENT_REMAP true
	#else
	#define SSD1306_PANEL_SEGMENT_REMAP false
	#endif

	#if DT_INST_PROP(0, com_invdir) == 1
	#define SSD1306_PANEL_COM_INVDIR true
	#else
	#define SSD1306_PANEL_COM_INVDIR false
	#endif

	#if DT_INST_PROP(0, com_sequential) == 1
	#define SSD1306_COM_PINS_HW_CONFIG SSD1306_SET_PADS_HW_SEQUENTIAL
	#else
	#define SSD1306_COM_PINS_HW_CONFIG SSD1306_SET_PADS_HW_ALTERNATIVE
	#endif

	#define SSD1306_PANEL_NUMOF_PAGES (DT_INST_PROP(0, height) / 8)
	#define SSD1306_CLOCK_DIV_RATIO 0x0
	#define SSD1306_CLOCK_FREQUENCY 0x8
	#define SSD1306_PANEL_VCOM_DESEL_LEVEL 0x20
	#define SSD1306_PANEL_PUMP_VOLTAGE SSD1306_SET_PUMP_VOLTAGE_90

	#ifndef SSD1306_ADDRESSING_MODE
	#define SSD1306_ADDRESSING_MODE (SSD1306_SET_MEM_ADDRESSING_HORIZONTAL)
	#endif

	struct ssd1306_config {
	#if DT_INST_ON_BUS(0, i2c)
	struct i2c_dt_spec bus;
	#elif DT_INST_ON_BUS(0, spi)
	struct spi_dt_spec bus;
	struct gpio_dt_spec data_cmd;
	#endif
	struct gpio_dt_spec reset;
	};

	struct ssd1306_data {
	uint8_t contrast;
	uint8_t scan_mode;
	};

	#if DT_INST_ON_BUS(0, i2c)

	static inline bool ssd1306_bus_ready(const struct device *dev)
	{
	const struct ssd1306_config *config = dev->config;

	return device_is_ready(config->bus.bus);
	}

	static inline int ssd1306_write_bus(const struct device *dev,
	uint8_t *buf, size_t len, bool command)
	{
	const struct ssd1306_config *config = dev->config;

	return i2c_burst_write_dt(&config->bus,
	command ? SSD1306_CONTROL_ALL_BYTES_CMD :
	SSD1306_CONTROL_ALL_BYTES_DATA,
	buf, len);
	}

	#elif DT_INST_ON_BUS(0, spi)

	static inline bool ssd1306_bus_ready(const struct device *dev)
	{
	const struct ssd1306_config *config = dev->config;

	if (gpio_pin_configure_dt(&config->data_cmd, GPIO_OUTPUT_INACTIVE) < 0) {
	return false;
	}

	return spi_is_ready(&config->bus);
	}

	static inline int ssd1306_write_bus(const struct device *dev,
	uint8_t *buf, size_t len, bool command)
	{
	const struct ssd1306_config *config = dev->config;
	int errno;

	gpio_pin_set_dt(&config->data_cmd, command ? 0 : 1);
	struct spi_buf tx_buf = {
	.buf = buf,
	.len = len
	};

	struct spi_buf_set tx_bufs = {
	.buffers = &tx_buf,
	.count = 1
	};

	errno = spi_write_dt(&config->bus, &tx_bufs);

	return errno;
	}
	#endif

	static inline int ssd1306_set_panel_orientation(const struct device *dev)
	{
	uint8_t cmd_buf[] = {
	(SSD1306_PANEL_SEGMENT_REMAP ?
	SSD1306_SET_SEGMENT_MAP_REMAPED :
	SSD1306_SET_SEGMENT_MAP_NORMAL),
	(SSD1306_PANEL_COM_INVDIR ?
	SSD1306_SET_COM_OUTPUT_SCAN_FLIPPED :
	SSD1306_SET_COM_OUTPUT_SCAN_NORMAL)
	};

	return ssd1306_write_bus(dev, cmd_buf, sizeof(cmd_buf), true);
	}

	static inline int ssd1306_set_timing_setting(const struct device *dev)
	{
	uint8_t cmd_buf[] = {
	SSD1306_SET_CLOCK_DIV_RATIO,
	(SSD1306_CLOCK_FREQUENCY << 4) \| SSD1306_CLOCK_DIV_RATIO,
	SSD1306_SET_CHARGE_PERIOD,
	DT_INST_PROP(0, prechargep),
	SSD1306_SET_VCOM_DESELECT_LEVEL,
	SSD1306_PANEL_VCOM_DESEL_LEVEL
	};

	return ssd1306_write_bus(dev, cmd_buf, sizeof(cmd_buf), true);
	}

	static inline int ssd1306_set_hardware_config(const struct device *dev)
	{
	uint8_t cmd_buf[] = {
	SSD1306_SET_START_LINE,
	SSD1306_SET_DISPLAY_OFFSET,
	DT_INST_PROP(0, display_offset),
	SSD1306_SET_PADS_HW_CONFIG,
	SSD1306_COM_PINS_HW_CONFIG,
	SSD1306_SET_MULTIPLEX_RATIO,
	DT_INST_PROP(0, multiplex_ratio)
	};

	return ssd1306_write_bus(dev, cmd_buf, sizeof(cmd_buf), true);
	}

	static inline int ssd1306_set_charge_pump(const struct device *dev)
	{
	uint8_t cmd_buf[] = {
	#if defined(CONFIG_SSD1306_DEFAULT)
	SSD1306_SET_CHARGE_PUMP_ON,
	SSD1306_SET_CHARGE_PUMP_ON_ENABLED,
	#endif
	#if defined(CONFIG_SSD1306_SH1106_COMPATIBLE)
	SH1106_SET_DCDC_MODE,
	SH1106_SET_DCDC_ENABLED,
	#endif
	SSD1306_PANEL_PUMP_VOLTAGE,
	};

	return ssd1306_write_bus(dev, cmd_buf, sizeof(cmd_buf), true);
	}

	static int ssd1306_resume(const struct device *dev)
	{
	uint8_t cmd_buf[] = {
	SSD1306_DISPLAY_ON,
	};

	return ssd1306_write_bus(dev, cmd_buf, sizeof(cmd_buf), true);
	}

	static int ssd1306_suspend(const struct device *dev)
	{
	uint8_t cmd_buf[] = {
	SSD1306_DISPLAY_OFF,
	};

	return ssd1306_write_bus(dev, cmd_buf, sizeof(cmd_buf), true);
	}

	static int ssd1306_write(const struct device *dev, const uint16_t x, const uint16_t y,
	const struct display_buffer_descriptor *desc,
	const void *buf)
	{
	size_t buf_len;

	if (desc->pitch < desc->width) {
	LOG_ERR("Pitch is smaller then width");
	return -1;
	}

	buf_len = MIN(desc->buf_size, desc->height * desc->width / 8);
	if (buf == NULL \|\| buf_len == 0U) {
	LOG_ERR("Display buffer is not available");
	return -1;
	}

	if (desc->pitch > desc->width) {
	LOG_ERR("Unsupported mode");
	return -1;
	}

	if ((y & 0x7) != 0U) {
	LOG_ERR("Unsupported origin");
	return -1;
	}

	LOG_DBG("x %u, y %u, pitch %u, width %u, height %u, buf_len %u",
	x, y, desc->pitch, desc->width, desc->height, buf_len);

	#if defined(CONFIG_SSD1306_DEFAULT)
	uint8_t cmd_buf[] = {
	SSD1306_SET_MEM_ADDRESSING_MODE,
	SSD1306_ADDRESSING_MODE,
	SSD1306_SET_COLUMN_ADDRESS,
	x,
	(x + desc->width - 1),
	SSD1306_SET_PAGE_ADDRESS,
	y/8,
	((y + desc->height)/8 - 1)
	};

	if (ssd1306_write_bus(dev, cmd_buf, sizeof(cmd_buf), true)) {
	LOG_ERR("Failed to write command");
	return -1;
	}

	return ssd1306_write_bus(dev, (uint8_t *)buf, buf_len, false);

	#elif defined(CONFIG_SSD1306_SH1106_COMPATIBLE)
	uint8_t x_offset = x + DT_INST_PROP(0, segment_offset);
	uint8_t cmd_buf[] = {
	SSD1306_SET_LOWER_COL_ADDRESS \|
	(x_offset & SSD1306_SET_LOWER_COL_ADDRESS_MASK),
	SSD1306_SET_HIGHER_COL_ADDRESS \|
	((x_offset >> 4) & SSD1306_SET_LOWER_COL_ADDRESS_MASK),
	SSD1306_SET_PAGE_START_ADDRESS \| (y / 8)
	};
	uint8_t buf_ptr = (uint8_t )buf;

	for (uint8_t n = 0; n < desc->height / 8; n++) {
	cmd_buf[sizeof(cmd_buf) - 1] =
	SSD1306_SET_PAGE_START_ADDRESS \| (n + (y / 8));
	LOG_HEXDUMP_DBG(cmd_buf, sizeof(cmd_buf), "cmd_buf");

	if (ssd1306_write_bus(dev, cmd_buf, sizeof(cmd_buf), true)) {
	return -1;
	}

	if (ssd1306_write_bus(dev, buf_ptr, desc->width, false)) {
	return -1;
	}

	buf_ptr = buf_ptr + desc->width;
	if (buf_ptr > ((uint8_t *)buf + buf_len)) {
	LOG_ERR("Exceeded buffer length");
	return -1;
	}
	}
	#endif

	return 0;
	}

	static int ssd1306_read(const struct device *dev, const uint16_t x,
	const uint16_t y,
	const struct display_buffer_descriptor *desc,
	void *buf)
	{
	LOG_ERR("Unsupported");
	return -ENOTSUP;
	}

	static void ssd1306_get_framebuffer(const struct device dev)
	{
	LOG_ERR("Unsupported");
	return NULL;
	}

	static int ssd1306_set_brightness(const struct device *dev,
	const uint8_t brightness)
	{
	LOG_WRN("Unsupported");
	return -ENOTSUP;
	}

	static int ssd1306_set_contrast(const struct device *dev, const uint8_t contrast)
	{
	uint8_t cmd_buf[] = {
	SSD1306_SET_CONTRAST_CTRL,
	contrast,
	};

	return ssd1306_write_bus(dev, cmd_buf, sizeof(cmd_buf), true);
	}

	static void ssd1306_get_capabilities(const struct device *dev,
	struct display_capabilities *caps)
	{
	memset(caps, 0, sizeof(struct display_capabilities));
	caps->x_resolution = DT_INST_PROP(0, width);
	caps->y_resolution = DT_INST_PROP(0, height);
	caps->supported_pixel_formats = PIXEL_FORMAT_MONO10;
	caps->current_pixel_format = PIXEL_FORMAT_MONO10;
	caps->screen_info = SCREEN_INFO_MONO_VTILED;
	}

	static int ssd1306_set_orientation(const struct device *dev,
	const enum display_orientation
	orientation)
	{
	LOG_ERR("Unsupported");
	return -ENOTSUP;
	}

	static int ssd1306_set_pixel_format(const struct device *dev,
	const enum display_pixel_format pf)
	{
	if (pf == PIXEL_FORMAT_MONO10) {
	return 0;
	}
	LOG_ERR("Unsupported");
	return -ENOTSUP;
	}

	static int ssd1306_init_device(const struct device *dev)
	{
	const struct ssd1306_config *config = dev->config;

	uint8_t cmd_buf[] = {
	SSD1306_SET_ENTIRE_DISPLAY_OFF,
	#ifdef CONFIG_SSD1306_REVERSE_MODE
	SSD1306_SET_REVERSE_DISPLAY,
	#else
	SSD1306_SET_NORMAL_DISPLAY,
	#endif
	};

	/* Reset if pin connected */
	if (config->reset.port) {
	k_sleep(K_MSEC(SSD1306_RESET_DELAY));
	gpio_pin_set_dt(&config->reset, 1);
	k_sleep(K_MSEC(SSD1306_RESET_DELAY));
	gpio_pin_set_dt(&config->reset, 0);
	}

	/* Turn display off */
	if (ssd1306_suspend(dev)) {
	return -EIO;
	}

	if (ssd1306_set_timing_setting(dev)) {
	return -EIO;
	}

	if (ssd1306_set_hardware_config(dev)) {
	return -EIO;
	}

	if (ssd1306_set_panel_orientation(dev)) {
	return -EIO;
	}

	if (ssd1306_set_charge_pump(dev)) {
	return -EIO;
	}

	if (ssd1306_write_bus(dev, cmd_buf, sizeof(cmd_buf), true)) {
	return -EIO;
	}

	if (ssd1306_set_contrast(dev, CONFIG_SSD1306_DEFAULT_CONTRAST)) {
	return -EIO;
	}

	ssd1306_resume(dev);

	return 0;
	}

	static int ssd1306_init(const struct device *dev)
	{
	const struct ssd1306_config *config = dev->config;

	LOG_DBG("");

	if (!ssd1306_bus_ready(dev)) {
	LOG_ERR("Bus device %s not ready!", config->bus.bus->name);
	return -EINVAL;
	}

	if (config->reset.port) {
	int ret;

	ret = gpio_pin_configure_dt(&config->reset,
	GPIO_OUTPUT_INACTIVE);
	if (ret < 0) {
	return ret;
	}
	}

	if (ssd1306_init_device(dev)) {
	LOG_ERR("Failed to initialize device!");
	return -EIO;
	}

	return 0;
	}

	static const struct ssd1306_config ssd1306_config = {
	#if DT_INST_ON_BUS(0, i2c)
	.bus = I2C_DT_SPEC_INST_GET(0),
	#elif DT_INST_ON_BUS(0, spi)
	.bus = SPI_DT_SPEC_INST_GET(
	0, SPI_OP_MODE_MASTER \| SPI_TRANSFER_MSB \| SPI_WORD_SET(8), 0),
	.data_cmd = GPIO_DT_SPEC_INST_GET(0, data_cmd_gpios),
	#endif
	.reset = GPIO_DT_SPEC_INST_GET_OR(0, reset_gpios, { 0 })
	};

	static struct ssd1306_data ssd1306_driver;

	static struct display_driver_api ssd1306_driver_api = {
	.blanking_on = ssd1306_suspend,
	.blanking_off = ssd1306_resume,
	.write = ssd1306_write,
	.read = ssd1306_read,
	.get_framebuffer = ssd1306_get_framebuffer,
	.set_brightness = ssd1306_set_brightness,
	.set_contrast = ssd1306_set_contrast,
	.get_capabilities = ssd1306_get_capabilities,
	.set_pixel_format = ssd1306_set_pixel_format,
	.set_orientation = ssd1306_set_orientation,
	};

	DEVICE_DT_INST_DEFINE(0, ssd1306_init, NULL,
	&ssd1306_driver, &ssd1306_config,
	POST_KERNEL, CONFIG_DISPLAY_INIT_PRIORITY,
	&ssd1306_driver_api);