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drivers: ssd1306: Support GPIO reset function

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If dts has reset-gpios information, reset it.

Signed-off-by: Kwon Tae-young <tykwon@m2i.co.kr>
This commit is contained in:
Kwon Tae-young 2019-02-22 17:29:40 +09:00 • committed by Anas Nashif
commit e0a8990ea7
2 changed files with 22 additions and 0 deletions
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19
drivers/display/ssd1306.c
View file

@ -47,6 +47,7 @@ LOG_MODULE_REGISTER(ssd1306);
#endif #endif
struct ssd1306_data { struct ssd1306_data {
struct device *reset;
struct device *i2c; struct device *i2c;
u8_t contrast; u8_t contrast;
u8_t scan_mode; u8_t scan_mode;
@ -366,6 +367,12 @@ static int ssd1306_init_device(struct device *dev)
SSD1306_SET_NORMAL_DISPLAY, SSD1306_SET_NORMAL_DISPLAY,
}; };
#ifdef DT_SOLOMON_SSD1306FB_0_RESET_GPIOS_CONTROLLER
gpio_pin_write(driver->reset, DT_SOLOMON_SSD1306FB_0_RESET_GPIOS_PIN, 0);
k_sleep(SSD1306_RESET_DELAY);
gpio_pin_write(driver->reset, DT_SOLOMON_SSD1306FB_0_RESET_GPIOS_PIN, 1);
#endif
/* Turn display off */ /* Turn display off */
if (ssd1306_reg_write(driver, SSD1306_CONTROL_LAST_BYTE_CMD, if (ssd1306_reg_write(driver, SSD1306_CONTROL_LAST_BYTE_CMD,
SSD1306_DISPLAY_OFF)) { SSD1306_DISPLAY_OFF)) {
@ -415,6 +422,18 @@ static int ssd1306_init(struct device *dev)
return -EINVAL; return -EINVAL;
} }
#ifdef DT_SOLOMON_SSD1306FB_0_RESET_GPIOS_CONTROLLER
driver->reset = device_get_binding(DT_SOLOMON_SSD1306FB_0_RESET_GPIOS_CONTROLLER);
if (driver->reset == NULL) {
LOG_ERR("Failed to get pointer to %s device!",
DT_SOLOMON_SSD1306FB_0_RESET_GPIOS_CONTROLLER);
return -EINVAL;
}
gpio_pin_configure(driver->reset, DT_SOLOMON_SSD1306FB_0_RESET_GPIOS_PIN,
GPIO_DIR_OUT);
#endif
if (ssd1306_init_device(dev)) { if (ssd1306_init_device(dev)) {
LOG_ERR("Failed to initialize device!"); LOG_ERR("Failed to initialize device!");
return -EIO; return -EIO;

3
drivers/display/ssd1306_regs.h
View file

@ -106,4 +106,7 @@
#define SSD1306_READ_MODIFY_WRITE_START 0xe0 #define SSD1306_READ_MODIFY_WRITE_START 0xe0
#define SSD1306_READ_MODIFY_WRITE_END 0xee #define SSD1306_READ_MODIFY_WRITE_END 0xee
/* time constants in ms */
#define SSD1306_RESET_DELAY 1
#endif #endif