Introduce LCD display_driver infrastructure

* introduce display_driver layer
* port st7558 and ssd1783 drivers to display_driver
* allow for run-time selection of display driver from board/init.c
* replace st7558_puts() calls with display_puts() calls

1 files changed, 47 insertions, 0 deletions

diff --git a/src/target/firmware/include/display.h b/src/target/firmware/include/display.h
new file mode 100644
index 00000000..b49ae7bd
--- /dev/null
+++ b/src/target/firmware/include/display.h
@@ -0,0 +1,47 @@
+#ifndef _DISPLAY_DRIVER_H
+#define _DISPLAY_DRIVER_H
+
+enum display_attr {
+	DISP_ATTR_INVERT	= 0x0001,
+};
+
+struct display_driver {
+	char *name;
+	void (*init)(void);
+	void (*set_attr)(unsigned long attr);
+	void (*unset_attr)(unsigned long attr);
+	void (*clrscr)(void);
+	void (*goto_xy)(int xpos, int ypos);
+	void (*set_color)(int fgcolor, int bgcolor);
+	int (*putc)(unsigned char c);
+	int (*puts)(const char *str);
+};
+
+extern struct display_driver *display;
+
+static inline void display_init(void)
+{
+	display->init();
+}
+static inline void display_set_attr(unsigned long attr)
+{
+	display->set_attr(attr);
+}
+static inline void display_unset_attr(unsigned long attr)
+{
+	display->unset_attr(attr);
+}
+static inline void display_clrscr(void)
+{
+	display->clrscr();
+}
+static inline int display_putchar(unsigned char c)
+{
+	return display->putc(c);
+}
+int display_puts(const char *s);
+
+extern const struct display_driver st7558_display;
+extern const struct display_driver ssd1783_display;
+
+#endif