353 lines
10 KiB
C
353 lines
10 KiB
C
/*
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* Copyright (c) 2024 Savoir-faire Linux
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*
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* SPDX-License-Identifier: Apache-2.0
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*/
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#include <zephyr/logging/log.h>
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LOG_MODULE_REGISTER(ssd1327, CONFIG_DISPLAY_LOG_LEVEL);
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#include <string.h>
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#include <zephyr/device.h>
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#include <zephyr/init.h>
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#include <zephyr/drivers/display.h>
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#include <zephyr/drivers/gpio.h>
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#include <zephyr/drivers/mipi_dbi.h>
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#include <zephyr/kernel.h>
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#include "ssd1327_regs.h"
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#define SSD1327_ENABLE_VDD 0x01
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#define SSD1327_ENABLE_SECOND_PRECHARGE 0x62
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#define SSD1327_VCOMH_VOLTAGE 0x0f
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#define SSD1327_PHASES_VALUE 0xf1
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#define SSD1327_DEFAULT_PRECHARGE_V 0x08
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#define SSD1327_UNLOCK_COMMAND 0x12
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struct ssd1327_config {
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const struct device *mipi_dev;
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const struct mipi_dbi_config dbi_config;
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uint16_t height;
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uint16_t width;
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uint8_t oscillator_freq;
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uint8_t start_line;
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uint8_t display_offset;
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uint8_t multiplex_ratio;
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uint8_t prechargep;
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uint8_t remap_value;
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bool color_inversion;
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};
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struct ssd1327_data {
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uint8_t contrast;
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uint8_t scan_mode;
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};
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static inline int ssd1327_write_bus_cmd(const struct device *dev, const uint8_t cmd,
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const uint8_t *data, size_t len)
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{
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const struct ssd1327_config *config = dev->config;
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int err;
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/* Values given after the memory register must be sent with pin D/C set to 0. */
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/* Data is sent as a command following the mipi_cbi api */
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err = mipi_dbi_command_write(config->mipi_dev, &config->dbi_config, cmd, NULL, 0);
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if (err) {
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return err;
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}
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for (size_t i = 0; i < len; i++) {
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err = mipi_dbi_command_write(config->mipi_dev, &config->dbi_config,
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data[i], NULL, 0);
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if (err) {
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return err;
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}
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}
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mipi_dbi_release(config->mipi_dev, &config->dbi_config);
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return 0;
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}
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static inline int ssd1327_set_timing_setting(const struct device *dev)
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{
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const struct ssd1327_config *config = dev->config;
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uint8_t buf;
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buf = SSD1327_PHASES_VALUE;
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if (ssd1327_write_bus_cmd(dev, SSD1327_SET_PHASE_LENGTH, &buf, 1)) {
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return -EIO;
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}
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if (ssd1327_write_bus_cmd(dev, SSD1327_SET_OSC_FREQ, &config->oscillator_freq, 1)) {
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return -EIO;
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}
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if (ssd1327_write_bus_cmd(dev, SSD1327_SET_PRECHARGE_PERIOD, &config->prechargep, 1)) {
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return -EIO;
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}
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if (ssd1327_write_bus_cmd(dev, SSD1327_LINEAR_LUT, NULL, 0)) {
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return -EIO;
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}
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buf = SSD1327_DEFAULT_PRECHARGE_V;
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if (ssd1327_write_bus_cmd(dev, SSD1327_SET_PRECHARGE_VOLTAGE, &buf, 1)) {
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return -EIO;
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}
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buf = SSD1327_VCOMH_VOLTAGE;
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if (ssd1327_write_bus_cmd(dev, SSD1327_SET_VCOMH, &buf, 1)) {
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return -EIO;
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}
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buf = SSD1327_ENABLE_SECOND_PRECHARGE;
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if (ssd1327_write_bus_cmd(dev, SSD1327_FUNCTION_SELECTION_B, &buf, 1)) {
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return -EIO;
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}
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buf = SSD1327_UNLOCK_COMMAND;
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if (ssd1327_write_bus_cmd(dev, SSD1327_SET_COMMAND_LOCK, &buf, 1)) {
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return -EIO;
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}
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return 0;
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}
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static inline int ssd1327_set_hardware_config(const struct device *dev)
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{
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const struct ssd1327_config *config = dev->config;
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uint8_t buf;
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if (ssd1327_write_bus_cmd(dev, SSD1327_SET_DISPLAY_START_LINE, &config->start_line, 1)) {
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return -EIO;
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}
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if (ssd1327_write_bus_cmd(dev, SSD1327_SET_DISPLAY_OFFSET, &config->display_offset, 1)) {
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return -EIO;
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}
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if (ssd1327_write_bus_cmd(dev, SSD1327_SET_NORMAL_DISPLAY, NULL, 0)) {
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return -EIO;
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}
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if (ssd1327_write_bus_cmd(dev, SSD1327_SET_SEGMENT_MAP_REMAPED, &config->remap_value, 1)) {
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return -EIO;
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}
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if (ssd1327_write_bus_cmd(dev, SSD1327_SET_MULTIPLEX_RATIO, &config->multiplex_ratio, 1)) {
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return -EIO;
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}
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buf = SSD1327_ENABLE_VDD;
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if (ssd1327_write_bus_cmd(dev, SSD1327_SET_FUNCTION_A, &buf, 1)) {
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return -EIO;
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}
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return 0;
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}
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static int ssd1327_resume(const struct device *dev)
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{
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return ssd1327_write_bus_cmd(dev, SSD1327_DISPLAY_ON, NULL, 0);
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}
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static int ssd1327_suspend(const struct device *dev)
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{
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return ssd1327_write_bus_cmd(dev, SSD1327_DISPLAY_OFF, NULL, 0);
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}
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static int ssd1327_set_display(const struct device *dev)
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{
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const struct ssd1327_config *config = dev->config;
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uint8_t x_position[] = {
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0,
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config->width - 1
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};
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uint8_t y_position[] = {
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0,
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config->height - 1
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};
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if (ssd1327_write_bus_cmd(dev, SSD1327_SET_COLUMN_ADDR, x_position, sizeof(x_position))) {
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return -EIO;
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}
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if (ssd1327_write_bus_cmd(dev, SSD1327_SET_ROW_ADDR, y_position, sizeof(y_position))) {
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return -EIO;
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}
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if (ssd1327_write_bus_cmd(dev, SSD1327_SET_SEGMENT_MAP_REMAPED, &config->remap_value, 1)) {
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return -EIO;
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}
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return 0;
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}
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static int ssd1327_write(const struct device *dev, const uint16_t x, const uint16_t y,
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const struct display_buffer_descriptor *desc, const void *buf)
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{
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const struct ssd1327_config *config = dev->config;
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struct display_buffer_descriptor mipi_desc;
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int err;
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size_t buf_len;
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uint8_t x_position[] = { x, x + desc->width - 1 };
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uint8_t y_position[] = { y, y + desc->height - 1 };
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if (desc->pitch < desc->width) {
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LOG_ERR("Pitch is smaller than width");
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return -1;
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}
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mipi_desc.pitch = desc->pitch;
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/* Following the datasheet, in the GDDRAM, two segment are split in one register */
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buf_len = MIN(desc->buf_size, desc->height * desc->width / 2);
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if (buf == NULL || buf_len == 0U) {
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LOG_ERR("Display buffer is not available");
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return -1;
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}
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mipi_desc.buf_size = buf_len;
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if (desc->pitch > desc->width) {
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LOG_ERR("Unsupported mode");
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return -1;
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}
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if ((y & 0x7) != 0U) {
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LOG_ERR("Unsupported origin");
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return -1;
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}
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mipi_desc.height = desc->height;
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mipi_desc.width = desc->width;
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LOG_DBG("x %u, y %u, pitch %u, width %u, height %u, buf_len %u", x, y, desc->pitch,
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desc->width, desc->height, buf_len);
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err = ssd1327_write_bus_cmd(dev, SSD1327_SET_COLUMN_ADDR, x_position, sizeof(x_position));
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if (err) {
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return err;
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}
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err = ssd1327_write_bus_cmd(dev, SSD1327_SET_ROW_ADDR, y_position, sizeof(y_position));
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if (err) {
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return err;
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}
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err = mipi_dbi_write_display(config->mipi_dev, &config->dbi_config, buf, &mipi_desc,
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PIXEL_FORMAT_MONO10);
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if (err) {
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return err;
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}
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return mipi_dbi_release(config->mipi_dev, &config->dbi_config);
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}
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static int ssd1327_set_contrast(const struct device *dev, const uint8_t contrast)
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{
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return ssd1327_write_bus_cmd(dev, SSD1327_SET_CONTRAST_CTRL, &contrast, 1);
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}
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static void ssd1327_get_capabilities(const struct device *dev,
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struct display_capabilities *caps)
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{
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const struct ssd1327_config *config = dev->config;
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memset(caps, 0, sizeof(struct display_capabilities));
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caps->x_resolution = config->width;
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caps->y_resolution = config->height;
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caps->supported_pixel_formats = PIXEL_FORMAT_MONO10;
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caps->current_pixel_format = PIXEL_FORMAT_MONO10;
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caps->screen_info = SCREEN_INFO_MONO_VTILED;
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}
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static int ssd1327_set_pixel_format(const struct device *dev,
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const enum display_pixel_format pf)
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{
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if (pf == PIXEL_FORMAT_MONO10) {
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return 0;
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}
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LOG_ERR("Unsupported pixel format");
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return -ENOTSUP;
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}
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static int ssd1327_init_device(const struct device *dev)
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{
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const struct ssd1327_config *config = dev->config;
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uint8_t buf;
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/* Turn display off */
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if (ssd1327_suspend(dev)) {
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return -EIO;
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}
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if (ssd1327_set_display(dev)) {
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return -EIO;
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}
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if (ssd1327_set_contrast(dev, CONFIG_SSD1327_DEFAULT_CONTRAST)) {
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return -EIO;
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}
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if (ssd1327_set_hardware_config(dev)) {
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return -EIO;
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}
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buf = (config->color_inversion ?
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SSD1327_SET_REVERSE_DISPLAY : SSD1327_SET_NORMAL_DISPLAY);
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if (ssd1327_write_bus_cmd(dev, SSD1327_SET_ENTIRE_DISPLAY_OFF, &buf, 1)) {
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return -EIO;
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}
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if (ssd1327_set_timing_setting(dev)) {
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return -EIO;
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}
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if (ssd1327_resume(dev)) {
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return -EIO;
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}
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return 0;
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}
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static int ssd1327_init(const struct device *dev)
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{
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const struct ssd1327_config *config = dev->config;
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LOG_DBG("Initializing device");
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if (!device_is_ready(config->mipi_dev)) {
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LOG_ERR("MIPI Device not ready!");
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return -EINVAL;
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}
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if (mipi_dbi_reset(config->mipi_dev, SSD1327_RESET_DELAY)) {
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LOG_ERR("Failed to reset device!");
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return -EIO;
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}
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k_msleep(SSD1327_RESET_DELAY);
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if (ssd1327_init_device(dev)) {
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LOG_ERR("Failed to initialize device!");
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return -EIO;
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}
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return 0;
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}
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static struct display_driver_api ssd1327_driver_api = {
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.blanking_on = ssd1327_suspend,
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.blanking_off = ssd1327_resume,
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.write = ssd1327_write,
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.set_contrast = ssd1327_set_contrast,
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.get_capabilities = ssd1327_get_capabilities,
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.set_pixel_format = ssd1327_set_pixel_format,
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};
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#define SSD1327_DEFINE(node_id) \
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static struct ssd1327_data data##node_id; \
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static const struct ssd1327_config config##node_id = { \
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.mipi_dev = DEVICE_DT_GET(DT_PARENT(node_id)), \
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.dbi_config = { .mode = MIPI_DBI_MODE_SPI_4WIRE, \
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.config = MIPI_DBI_SPI_CONFIG_DT(node_id, \
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SPI_OP_MODE_MASTER | SPI_WORD_SET(8) | \
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SPI_HOLD_ON_CS | SPI_LOCK_ON, 0), \
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}, \
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.height = DT_PROP(node_id, height), \
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.width = DT_PROP(node_id, width), \
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.oscillator_freq = DT_PROP(node_id, oscillator_freq), \
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.display_offset = DT_PROP(node_id, display_offset), \
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.start_line = DT_PROP(node_id, start_line), \
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.multiplex_ratio = DT_PROP(node_id, multiplex_ratio), \
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.prechargep = DT_PROP(node_id, prechargep), \
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.remap_value = DT_PROP(node_id, remap_value), \
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.color_inversion = DT_PROP(node_id, inversion_on), \
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}; \
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\
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DEVICE_DT_DEFINE(node_id, ssd1327_init, NULL, &data##node_id, &config##node_id, \
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POST_KERNEL, CONFIG_DISPLAY_INIT_PRIORITY, &ssd1327_driver_api);
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DT_FOREACH_STATUS_OKAY(solomon_ssd1327fb, SSD1327_DEFINE)
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