3  * Character LCD driver for Linux
27 #define LCD_ESCAPE_LEN		24	/* Max chars for LCD escape command */
31 	struct charlcd lcd;  member
39 	/* contains the LCD config state */
51 #define charlcd_to_priv(p)	container_of(p, struct charlcd_priv, lcd)
57 void charlcd_backlight(struct charlcd *lcd, enum charlcd_onoff on)  in charlcd_backlight()  argument
59 	struct charlcd_priv *priv = charlcd_to_priv(lcd);  in charlcd_backlight()
61 	if (!lcd->ops->backlight)  in charlcd_backlight()
66 		lcd->ops->backlight(lcd, on);  in charlcd_backlight()
81 			priv->lcd.ops->backlight(&priv->lcd, CHARLCD_OFF);  in charlcd_bl_off()
87 void charlcd_poke(struct charlcd *lcd)  in charlcd_poke()  argument
89 	struct charlcd_priv *priv = charlcd_to_priv(lcd);  in charlcd_poke()
91 	if (!lcd->ops->backlight)  in charlcd_poke()
98 		lcd->ops->backlight(lcd, CHARLCD_ON);  in charlcd_poke()
105 static void charlcd_home(struct charlcd *lcd)  in charlcd_home()  argument
107 	lcd->addr.x = 0;  in charlcd_home()
108 	lcd->addr.y = 0;  in charlcd_home()
109 	lcd->ops->home(lcd);  in charlcd_home()
112 static void charlcd_print(struct charlcd *lcd, char c)  in charlcd_print()  argument
114 	if (lcd->addr.x >= lcd->width)  in charlcd_print()
117 	if (lcd->char_conv)  in charlcd_print()
118 		c = lcd->char_conv[(unsigned char)c];  in charlcd_print()
120 	if (!lcd->ops->print(lcd, c))  in charlcd_print()
121 		lcd->addr.x++;  in charlcd_print()
124 	if (lcd->addr.x == lcd->width)  in charlcd_print()
125 		lcd->ops->gotoxy(lcd, lcd->addr.x - 1, lcd->addr.y);  in charlcd_print()
128 static void charlcd_clear_display(struct charlcd *lcd)  in charlcd_clear_display()  argument
130 	lcd->ops->clear_display(lcd);  in charlcd_clear_display()
131 	lcd->addr.x = 0;  in charlcd_clear_display()
132 	lcd->addr.y = 0;  in charlcd_clear_display()
189  * These are the file operation function for user access to /dev/lcd
195 static inline int handle_lcd_special_code(struct charlcd *lcd)  in handle_lcd_special_code()  argument
197 	struct charlcd_priv *priv = charlcd_to_priv(lcd);  in handle_lcd_special_code()
199 	/* LCD special codes */  in handle_lcd_special_code()
211 			lcd->ops->display(lcd, CHARLCD_ON);  in handle_lcd_special_code()
218 			lcd->ops->display(lcd, CHARLCD_OFF);  in handle_lcd_special_code()
225 			lcd->ops->cursor(lcd, CHARLCD_ON);  in handle_lcd_special_code()
232 			lcd->ops->cursor(lcd, CHARLCD_OFF);  in handle_lcd_special_code()
239 			lcd->ops->blink(lcd, CHARLCD_ON);  in handle_lcd_special_code()
246 			lcd->ops->blink(lcd, CHARLCD_OFF);  in handle_lcd_special_code()
253 			charlcd_backlight(lcd, CHARLCD_ON);  in handle_lcd_special_code()
260 			charlcd_backlight(lcd, CHARLCD_OFF);  in handle_lcd_special_code()
265 		charlcd_poke(lcd);  in handle_lcd_special_code()
271 			lcd->ops->fontsize(lcd, CHARLCD_FONTSIZE_SMALL);  in handle_lcd_special_code()
278 			lcd->ops->fontsize(lcd, CHARLCD_FONTSIZE_LARGE);  in handle_lcd_special_code()
285 			lcd->ops->lines(lcd, CHARLCD_LINES_1);  in handle_lcd_special_code()
292 			lcd->ops->lines(lcd, CHARLCD_LINES_2);  in handle_lcd_special_code()
297 		if (lcd->addr.x > 0) {  in handle_lcd_special_code()
298 			if (!lcd->ops->shift_cursor(lcd, CHARLCD_SHIFT_LEFT))  in handle_lcd_special_code()
299 				lcd->addr.x--;  in handle_lcd_special_code()
305 		if (lcd->addr.x < lcd->width) {  in handle_lcd_special_code()
306 			if (!lcd->ops->shift_cursor(lcd, CHARLCD_SHIFT_RIGHT))  in handle_lcd_special_code()
307 				lcd->addr.x++;  in handle_lcd_special_code()
313 		lcd->ops->shift_display(lcd, CHARLCD_SHIFT_LEFT);  in handle_lcd_special_code()
317 		lcd->ops->shift_display(lcd, CHARLCD_SHIFT_RIGHT);  in handle_lcd_special_code()
323 		xs = lcd->addr.x;  in handle_lcd_special_code()
324 		ys = lcd->addr.y;  in handle_lcd_special_code()
325 		for (x = lcd->addr.x; x < lcd->width; x++)  in handle_lcd_special_code()
326 			lcd->ops->print(lcd, ' ');  in handle_lcd_special_code()
329 		lcd->addr.x = xs;  in handle_lcd_special_code()
330 		lcd->addr.y = ys;  in handle_lcd_special_code()
331 		lcd->ops->gotoxy(lcd, lcd->addr.x, lcd->addr.y);  in handle_lcd_special_code()
336 		lcd->ops->init_display(lcd);  in handle_lcd_special_code()
337 		priv->flags = ((lcd->height > 1) ? LCD_FLAG_N : 0) | LCD_FLAG_D |  in handle_lcd_special_code()
342 		if (lcd->ops->redefine_char)  in handle_lcd_special_code()
343 			processed = lcd->ops->redefine_char(lcd, esc);  in handle_lcd_special_code()
354 		if (parse_xy(esc, &lcd->addr.x, &lcd->addr.y))  in handle_lcd_special_code()
355 			lcd->ops->gotoxy(lcd, lcd->addr.x, lcd->addr.y);  in handle_lcd_special_code()
365 static void charlcd_write_char(struct charlcd *lcd, char c)  in charlcd_write_char()  argument
367 	struct charlcd_priv *priv = charlcd_to_priv(lcd);  in charlcd_write_char()
386 			if (lcd->addr.x > 0) {  in charlcd_write_char()
388 				if (!lcd->ops->shift_cursor(lcd,  in charlcd_write_char()
390 					lcd->addr.x--;  in charlcd_write_char()
393 			charlcd_print(lcd, ' ');  in charlcd_write_char()
395 			if (!lcd->ops->shift_cursor(lcd, CHARLCD_SHIFT_LEFT))  in charlcd_write_char()
396 				lcd->addr.x--;  in charlcd_write_char()
401 			charlcd_clear_display(lcd);  in charlcd_write_char()
408 			for (; lcd->addr.x < lcd->width; lcd->addr.x++)  in charlcd_write_char()
409 				lcd->ops->print(lcd, ' ');  in charlcd_write_char()
411 			lcd->addr.x = 0;  in charlcd_write_char()
412 			lcd->addr.y = (lcd->addr.y + 1) % lcd->height;  in charlcd_write_char()
413 			lcd->ops->gotoxy(lcd, lcd->addr.x, lcd->addr.y);  in charlcd_write_char()
417 			lcd->addr.x = 0;  in charlcd_write_char()
418 			lcd->ops->gotoxy(lcd, lcd->addr.x, lcd->addr.y);  in charlcd_write_char()
422 			charlcd_print(lcd, ' ');  in charlcd_write_char()
426 			charlcd_print(lcd, c);  in charlcd_write_char()
440 			charlcd_clear_display(lcd);  in charlcd_write_char()
444 			charlcd_home(lcd);  in charlcd_write_char()
451 			processed = handle_lcd_special_code(lcd);  in charlcd_write_char()
454 		/* LCD special escape codes */  in charlcd_write_char()
505 		priv->lcd.ops->clear_display(&priv->lcd);  in charlcd_open()
507 		priv->lcd.addr.x = 0;  in charlcd_open()
508 		priv->lcd.addr.y = 0;  in charlcd_open()
532 	.name	= "lcd",
536 static void charlcd_puts(struct charlcd *lcd, const char *s)  in charlcd_puts()  argument
545 		charlcd_write_char(lcd, *tmp);  in charlcd_puts()
563 /* initialize the LCD driver */
564 static int charlcd_init(struct charlcd *lcd)  in charlcd_init()  argument
566 	struct charlcd_priv *priv = charlcd_to_priv(lcd);  in charlcd_init()
569 	priv->flags = ((lcd->height > 1) ? LCD_FLAG_N : 0) | LCD_FLAG_D |  in charlcd_init()
571 	if (lcd->ops->backlight) {  in charlcd_init()
579 	 * enable mark the LCD initialized just before.  in charlcd_init()
581 	if (WARN_ON(!lcd->ops->init_display))  in charlcd_init()
584 	ret = lcd->ops->init_display(lcd);  in charlcd_init()
589 	charlcd_puts(lcd, "\x1b[Lc\x1b[Lb" LCD_INIT_BL LCD_INIT_TEXT);  in charlcd_init()
593 	charlcd_home(lcd);  in charlcd_init()
600 	struct charlcd *lcd;  in charlcd_alloc()  local
608 	lcd = &priv->lcd;  in charlcd_alloc()
610 	return lcd;  in charlcd_alloc()
614 void charlcd_free(struct charlcd *lcd)  in charlcd_free()  argument
616 	kfree(charlcd_to_priv(lcd));  in charlcd_free()
623 	struct charlcd *lcd = the_charlcd;  in panel_notify_sys()  local
627 		charlcd_puts(lcd,  in panel_notify_sys()
631 		charlcd_puts(lcd, "\x0cSystem Halted.\x1b[Lc\x1b[Lb\x1b[L+");  in panel_notify_sys()
634 		charlcd_puts(lcd, "\x0cPower off.\x1b[Lc\x1b[Lb\x1b[L+");  in panel_notify_sys()
646 int charlcd_register(struct charlcd *lcd)  in charlcd_register()  argument
650 	ret = charlcd_init(lcd);  in charlcd_register()
658 	the_charlcd = lcd;  in charlcd_register()
664 int charlcd_unregister(struct charlcd *lcd)  in charlcd_unregister()  argument
666 	struct charlcd_priv *priv = charlcd_to_priv(lcd);  in charlcd_unregister()
669 	charlcd_puts(lcd, "\x0cLCD driver unloaded.\x1b[Lc\x1b[Lb\x1b[L-");  in charlcd_unregister()
672 	if (lcd->ops->backlight) {  in charlcd_unregister()
674 		priv->lcd.ops->backlight(&priv->lcd, CHARLCD_OFF);  in charlcd_unregister()