driver: display: Added dummy display driver

Added dummy display driver.

fixes: #12001

Signed-off-by: Jan Van Winkel <jan.van_winkel@dxplore.eu>

drivers/display/CMakeLists.txt

@@ -13,3 +13,5 @@ zephyr_sources_ifdef(CONFIG_SSD1673 ssd1673.c)
 
 zephyr_sources_ifdef(CONFIG_SDL_DISPLAY display_sdl.c)
 
+zephyr_sources_ifdef(CONFIG_DUMMY_DISPLAY display_dummy.c)
+

drivers/display/Kconfig

@@ -27,4 +27,6 @@ source "drivers/display/Kconfig.ssd1306"
 
 source "drivers/display/Kconfig.ssd1673"
 
+source "drivers/display/Kconfig.dummy"
+
 endif # DISPLAY

drivers/display/Kconfig.dummy

@@ -0,0 +1,28 @@
+# Kconfig - Configuration options for dummy display
+
+#
+# Copyright (c) 2018 Jan Van Winkel <jan.van_winkel@dxplore.eu>
+#
+# SPDX-License-Identifier: Apache-2.0
+#
+
+menuconfig DUMMY_DISPLAY
+	bool "Dummy display driver"
+	help
+	  Enable dummy display driver compliant with display driver API.
+
+if DUMMY_DISPLAY
+
+config DUMMY_DISPLAY_DEV_NAME
+	string "Dummy display device name"
+	default "DUMMY_DISPLAY"
+
+config DUMMY_DISPLAY_X_RES
+	int "X resolution for dummy display"
+	default 320
+
+config DUMMY_DISPLAY_Y_RES
+	int "Y resolution for dummy display"
+	default 240
+
+endif #DUMMY_DISPLAY

drivers/display/display_dummy.c

@@ -0,0 +1,114 @@
+/*
+ * Copyright (c) 2018 Jan Van Winkel <jan.van_winkel@dxplore.eu>
+ *
+ * SPDX-License-Identifier: Apache-2.0
+ */
+
+#include <string.h>
+
+#include <display.h>
+
+struct dummy_display_data {
+	enum display_pixel_format current_pixel_format;
+};
+
+static struct dummy_display_data dummy_display_data;
+
+static int dummy_display_init(struct device *dev)
+{
+	struct dummy_display_data *disp_data =
+	    (struct dummy_display_data *)dev->driver_data;
+
+	disp_data->current_pixel_format = PIXEL_FORMAT_ARGB_8888;
+
+	return 0;
+}
+
+static int dummy_display_write(const struct device *dev, const u16_t x,
+			       const u16_t y,
+			       const struct display_buffer_descriptor *desc,
+			       const void *buf)
+{
+	return 0;
+}
+
+static int dummy_display_read(const struct device *dev, const u16_t x,
+			      const u16_t y,
+			      const struct display_buffer_descriptor *desc,
+			      void *buf)
+{
+	return -ENOTSUP;
+}
+
+static void *dummy_display_get_framebuffer(const struct device *dev)
+{
+	return NULL;
+}
+
+static int dummy_display_blanking_off(const struct device *dev)
+{
+	return 0;
+}
+
+static int dummy_display_blanking_on(const struct device *dev)
+{
+	return 0;
+}
+
+static int dummy_display_set_brightness(const struct device *dev,
+					const u8_t brightness)
+{
+	return 0;
+}
+
+static int dummy_display_set_contrast(const struct device *dev,
+				      const u8_t contrast)
+{
+	return 0;
+}
+
+static void dummy_display_get_capabilities(const struct device *dev,
+		struct display_capabilities *capabilities)
+{
+	struct dummy_display_data *disp_data =
+		(struct dummy_display_data *)dev->driver_data;
+
+	memset(capabilities, 0, sizeof(struct display_capabilities));
+	capabilities->x_resolution = CONFIG_DUMMY_DISPLAY_X_RES;
+	capabilities->y_resolution = CONFIG_DUMMY_DISPLAY_Y_RES;
+	capabilities->supported_pixel_formats = PIXEL_FORMAT_ARGB_8888 |
+		PIXEL_FORMAT_RGB_888 |
+		PIXEL_FORMAT_MONO01 |
+		PIXEL_FORMAT_MONO10;
+	capabilities->current_pixel_format = disp_data->current_pixel_format;
+	capabilities->screen_info = SCREEN_INFO_MONO_VTILED |
+		SCREEN_INFO_MONO_MSB_FIRST;
+}
+
+static int dummy_display_set_pixel_format(const struct device *dev,
+		const enum display_pixel_format pixel_format)
+{
+	struct dummy_display_data *disp_data =
+		(struct dummy_display_data *)dev->driver_data;
+
+	disp_data->current_pixel_format = pixel_format;
+	return 0;
+}
+
+static const struct display_driver_api dummy_display_api = {
+	.blanking_on = dummy_display_blanking_on,
+	.blanking_off = dummy_display_blanking_off,
+	.write = dummy_display_write,
+	.read = dummy_display_read,
+	.get_framebuffer = dummy_display_get_framebuffer,
+	.set_brightness = dummy_display_set_brightness,
+	.set_contrast = dummy_display_set_contrast,
+	.get_capabilities = dummy_display_get_capabilities,
+	.set_pixel_format = dummy_display_set_pixel_format,
+};
+
+DEVICE_AND_API_INIT(dummy_display, CONFIG_DUMMY_DISPLAY_DEV_NAME,
+		    &dummy_display_init, &dummy_display_data, NULL,
+		    APPLICATION, CONFIG_APPLICATION_INIT_PRIORITY,
+		    &dummy_display_api);
+