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drivers: display: ssd1306: add power pin support

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Add a power pin toggling feature in ssd1306 driver

Signed-off-by: Eve Redero <eve.redero@gmail.com>
This commit is contained in:
Eve Redero 2025-01-16 11:27:28 +01:00 • committed by Benjamin Cabé
commit f683b188b3
2 changed files with 39 additions and 2 deletions
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40
drivers/display/ssd1306.c
View file

@ -43,6 +43,7 @@ struct ssd1306_config {
union ssd1306_bus bus;
struct gpio_dt_spec data_cmd;
struct gpio_dt_spec reset;
struct gpio_dt_spec supply;
ssd1306_bus_ready_fn bus_ready;
ssd1306_write_bus_fn write_bus;
ssd1306_bus_name_fn bus_name;
@ -226,19 +227,33 @@ static inline int ssd1306_set_iref_mode(const struct device *dev)
static int ssd1306_resume(const struct device *dev)
{
const struct ssd1306_config *config = dev->config;
uint8_t cmd_buf[] = {
SSD1306_DISPLAY_ON,
};
/* Turn on supply if pin connected */
if (config->supply.port) {
gpio_pin_set_dt(&config->supply, 1);
k_sleep(K_MSEC(SSD1306_SUPPLY_DELAY));
}
return ssd1306_write_bus(dev, cmd_buf, sizeof(cmd_buf), true);
}
static int ssd1306_suspend(const struct device *dev)
{
const struct ssd1306_config *config = dev->config;
uint8_t cmd_buf[] = {
SSD1306_DISPLAY_OFF,
};
/* Turn off supply if pin connected */
if (config->supply.port) {
gpio_pin_set_dt(&config->supply, 0);
k_sleep(K_MSEC(SSD1306_SUPPLY_DELAY));
}
return ssd1306_write_bus(dev, cmd_buf, sizeof(cmd_buf), true);
}
@ -408,6 +423,11 @@ static int ssd1306_init_device(const struct device *dev)
};
data->pf = config->color_inversion ? PIXEL_FORMAT_MONO10 : PIXEL_FORMAT_MONO01;
/* Turn on supply if pin connected */
if (config->supply.port) {
gpio_pin_set_dt(&config->supply, 1);
k_sleep(K_MSEC(SSD1306_SUPPLY_DELAY));
}
/* Reset if pin connected */
if (config->reset.port) {
@ -460,6 +480,7 @@ static int ssd1306_init_device(const struct device *dev)
static int ssd1306_init(const struct device *dev)
{
const struct ssd1306_config *config = dev->config;
int ret;
k_sleep(K_TIMEOUT_ABS_MS(config->ready_time_ms));
@ -468,14 +489,28 @@ static int ssd1306_init(const struct device *dev)
return -EINVAL;
}
if (config->reset.port) {
int ret;
if (config->supply.port) {
ret = gpio_pin_configure_dt(&config->supply,
GPIO_OUTPUT_INACTIVE);
if (ret < 0) {
return ret;
}
if (!gpio_is_ready_dt(&config->supply)) {
LOG_ERR("Supply GPIO device not ready");
return -ENODEV;
}
}
if (config->reset.port) {
ret = gpio_pin_configure_dt(&config->reset,
GPIO_OUTPUT_INACTIVE);
if (ret < 0) {
return ret;
}
if (!gpio_is_ready_dt(&config->reset)) {
LOG_ERR("Reset GPIO device not ready");
return -ENODEV;
}
}
if (ssd1306_init_device(dev)) {
@ -514,6 +549,7 @@ static DEVICE_API(display, ssd1306_driver_api) = {
static struct ssd1306_data data##node_id; \
static const struct ssd1306_config config##node_id = { \
.reset = GPIO_DT_SPEC_GET_OR(node_id, reset_gpios, {0}), \
.supply = GPIO_DT_SPEC_GET_OR(node_id, supply_gpios, {0}), \
.height = DT_PROP(node_id, height), \
.width = DT_PROP(node_id, width), \
.segment_offset = DT_PROP(node_id, segment_offset), \

1
drivers/display/ssd1306_regs.h
View file

@ -118,5 +118,6 @@
/* time constants in ms */
#define SSD1306_RESET_DELAY 1
#define SSD1306_SUPPLY_DELAY 20
#endif