3  * Character LCD driver for Linux
29 #define LCD_ESCAPE_LEN		24	/* Max chars for LCD escape command */
33 	struct charlcd lcd;  member
41 	/* contains the LCD config state */
53 #define charlcd_to_priv(p)	container_of(p, struct charlcd_priv, lcd)
59 void charlcd_backlight(struct charlcd *lcd, enum charlcd_onoff on)  in charlcd_backlight()  argument
61 	struct charlcd_priv *priv = charlcd_to_priv(lcd);  in charlcd_backlight()
63 	if (!lcd->ops->backlight)  in charlcd_backlight()
68 		lcd->ops->backlight(lcd, on);  in charlcd_backlight()
83 			priv->lcd.ops->backlight(&priv->lcd, CHARLCD_OFF);  in charlcd_bl_off()
89 void charlcd_poke(struct charlcd *lcd)  in charlcd_poke()  argument
91 	struct charlcd_priv *priv = charlcd_to_priv(lcd);  in charlcd_poke()
93 	if (!lcd->ops->backlight)  in charlcd_poke()
100 		lcd->ops->backlight(lcd, CHARLCD_ON);  in charlcd_poke()
107 static void charlcd_home(struct charlcd *lcd)  in charlcd_home()  argument
109 	lcd->addr.x = 0;  in charlcd_home()
110 	lcd->addr.y = 0;  in charlcd_home()
111 	lcd->ops->home(lcd);  in charlcd_home()
114 static void charlcd_print(struct charlcd *lcd, char c)  in charlcd_print()  argument
116 	if (lcd->addr.x >= lcd->width)  in charlcd_print()
119 	if (lcd->char_conv)  in charlcd_print()
120 		c = lcd->char_conv[(unsigned char)c];  in charlcd_print()
122 	if (!lcd->ops->print(lcd, c))  in charlcd_print()
123 		lcd->addr.x++;  in charlcd_print()
126 	if (lcd->addr.x == lcd->width)  in charlcd_print()
127 		lcd->ops->gotoxy(lcd, lcd->addr.x - 1, lcd->addr.y);  in charlcd_print()
130 static void charlcd_clear_display(struct charlcd *lcd)  in charlcd_clear_display()  argument
132 	lcd->ops->clear_display(lcd);  in charlcd_clear_display()
133 	lcd->addr.x = 0;  in charlcd_clear_display()
134 	lcd->addr.y = 0;  in charlcd_clear_display()
191  * These are the file operation function for user access to /dev/lcd
197 static inline int handle_lcd_special_code(struct charlcd *lcd)  in handle_lcd_special_code()  argument
199 	struct charlcd_priv *priv = charlcd_to_priv(lcd);  in handle_lcd_special_code()
201 	/* LCD special codes */  in handle_lcd_special_code()
213 			lcd->ops->display(lcd, CHARLCD_ON);  in handle_lcd_special_code()
220 			lcd->ops->display(lcd, CHARLCD_OFF);  in handle_lcd_special_code()
227 			lcd->ops->cursor(lcd, CHARLCD_ON);  in handle_lcd_special_code()
234 			lcd->ops->cursor(lcd, CHARLCD_OFF);  in handle_lcd_special_code()
241 			lcd->ops->blink(lcd, CHARLCD_ON);  in handle_lcd_special_code()
248 			lcd->ops->blink(lcd, CHARLCD_OFF);  in handle_lcd_special_code()
255 			charlcd_backlight(lcd, CHARLCD_ON);  in handle_lcd_special_code()
262 			charlcd_backlight(lcd, CHARLCD_OFF);  in handle_lcd_special_code()
267 		charlcd_poke(lcd);  in handle_lcd_special_code()
273 			lcd->ops->fontsize(lcd, CHARLCD_FONTSIZE_SMALL);  in handle_lcd_special_code()
280 			lcd->ops->fontsize(lcd, CHARLCD_FONTSIZE_LARGE);  in handle_lcd_special_code()
287 			lcd->ops->lines(lcd, CHARLCD_LINES_1);  in handle_lcd_special_code()
294 			lcd->ops->lines(lcd, CHARLCD_LINES_2);  in handle_lcd_special_code()
299 		if (lcd->addr.x > 0) {  in handle_lcd_special_code()
300 			if (!lcd->ops->shift_cursor(lcd, CHARLCD_SHIFT_LEFT))  in handle_lcd_special_code()
301 				lcd->addr.x--;  in handle_lcd_special_code()
307 		if (lcd->addr.x < lcd->width) {  in handle_lcd_special_code()
308 			if (!lcd->ops->shift_cursor(lcd, CHARLCD_SHIFT_RIGHT))  in handle_lcd_special_code()
309 				lcd->addr.x++;  in handle_lcd_special_code()
315 		lcd->ops->shift_display(lcd, CHARLCD_SHIFT_LEFT);  in handle_lcd_special_code()
319 		lcd->ops->shift_display(lcd, CHARLCD_SHIFT_RIGHT);  in handle_lcd_special_code()
325 		xs = lcd->addr.x;  in handle_lcd_special_code()
326 		ys = lcd->addr.y;  in handle_lcd_special_code()
327 		for (x = lcd->addr.x; x < lcd->width; x++)  in handle_lcd_special_code()
328 			lcd->ops->print(lcd, ' ');  in handle_lcd_special_code()
331 		lcd->addr.x = xs;  in handle_lcd_special_code()
332 		lcd->addr.y = ys;  in handle_lcd_special_code()
333 		lcd->ops->gotoxy(lcd, lcd->addr.x, lcd->addr.y);  in handle_lcd_special_code()
338 		lcd->ops->init_display(lcd);  in handle_lcd_special_code()
339 		priv->flags = ((lcd->height > 1) ? LCD_FLAG_N : 0) | LCD_FLAG_D |  in handle_lcd_special_code()
344 		if (lcd->ops->redefine_char)  in handle_lcd_special_code()
345 			processed = lcd->ops->redefine_char(lcd, esc);  in handle_lcd_special_code()
356 		if (parse_xy(esc, &lcd->addr.x, &lcd->addr.y))  in handle_lcd_special_code()
357 			lcd->ops->gotoxy(lcd, lcd->addr.x, lcd->addr.y);  in handle_lcd_special_code()
367 static void charlcd_write_char(struct charlcd *lcd, char c)  in charlcd_write_char()  argument
369 	struct charlcd_priv *priv = charlcd_to_priv(lcd);  in charlcd_write_char()
388 			if (lcd->addr.x > 0) {  in charlcd_write_char()
390 				if (!lcd->ops->shift_cursor(lcd,  in charlcd_write_char()
392 					lcd->addr.x--;  in charlcd_write_char()
395 			charlcd_print(lcd, ' ');  in charlcd_write_char()
397 			if (!lcd->ops->shift_cursor(lcd, CHARLCD_SHIFT_LEFT))  in charlcd_write_char()
398 				lcd->addr.x--;  in charlcd_write_char()
403 			charlcd_clear_display(lcd);  in charlcd_write_char()
410 			for (; lcd->addr.x < lcd->width; lcd->addr.x++)  in charlcd_write_char()
411 				lcd->ops->print(lcd, ' ');  in charlcd_write_char()
413 			lcd->addr.x = 0;  in charlcd_write_char()
414 			lcd->addr.y = (lcd->addr.y + 1) % lcd->height;  in charlcd_write_char()
415 			lcd->ops->gotoxy(lcd, lcd->addr.x, lcd->addr.y);  in charlcd_write_char()
419 			lcd->addr.x = 0;  in charlcd_write_char()
420 			lcd->ops->gotoxy(lcd, lcd->addr.x, lcd->addr.y);  in charlcd_write_char()
424 			charlcd_print(lcd, ' ');  in charlcd_write_char()
428 			charlcd_print(lcd, c);  in charlcd_write_char()
442 			charlcd_clear_display(lcd);  in charlcd_write_char()
446 			charlcd_home(lcd);  in charlcd_write_char()
453 			processed = handle_lcd_special_code(lcd);  in charlcd_write_char()
456 		/* LCD special escape codes */  in charlcd_write_char()
507 		priv->lcd.ops->clear_display(&priv->lcd);  in charlcd_open()
509 		priv->lcd.addr.x = 0;  in charlcd_open()
510 		priv->lcd.addr.y = 0;  in charlcd_open()
533 	.name	= "lcd",
537 static void charlcd_puts(struct charlcd *lcd, const char *s)  in charlcd_puts()  argument
546 		charlcd_write_char(lcd, *tmp);  in charlcd_puts()
564 /* initialize the LCD driver */
565 static int charlcd_init(struct charlcd *lcd)  in charlcd_init()  argument
567 	struct charlcd_priv *priv = charlcd_to_priv(lcd);  in charlcd_init()
570 	priv->flags = ((lcd->height > 1) ? LCD_FLAG_N : 0) | LCD_FLAG_D |  in charlcd_init()
572 	if (lcd->ops->backlight) {  in charlcd_init()
580 	 * enable mark the LCD initialized just before.  in charlcd_init()
582 	if (WARN_ON(!lcd->ops->init_display))  in charlcd_init()
585 	ret = lcd->ops->init_display(lcd);  in charlcd_init()
590 	charlcd_puts(lcd, "\x1b[Lc\x1b[Lb" LCD_INIT_BL LCD_INIT_TEXT);  in charlcd_init()
594 	charlcd_home(lcd);  in charlcd_init()
601 	struct charlcd *lcd;  in charlcd_alloc()  local
609 	lcd = &priv->lcd;  in charlcd_alloc()
611 	return lcd;  in charlcd_alloc()
615 void charlcd_free(struct charlcd *lcd)  in charlcd_free()  argument
617 	kfree(charlcd_to_priv(lcd));  in charlcd_free()
624 	struct charlcd *lcd = the_charlcd;  in panel_notify_sys()  local
628 		charlcd_puts(lcd,  in panel_notify_sys()
632 		charlcd_puts(lcd, "\x0cSystem Halted.\x1b[Lc\x1b[Lb\x1b[L+");  in panel_notify_sys()
635 		charlcd_puts(lcd, "\x0cPower off.\x1b[Lc\x1b[Lb\x1b[L+");  in panel_notify_sys()
647 int charlcd_register(struct charlcd *lcd)  in charlcd_register()  argument
651 	ret = charlcd_init(lcd);  in charlcd_register()
659 	the_charlcd = lcd;  in charlcd_register()
665 int charlcd_unregister(struct charlcd *lcd)  in charlcd_unregister()  argument
667 	struct charlcd_priv *priv = charlcd_to_priv(lcd);  in charlcd_unregister()
670 	charlcd_puts(lcd, "\x0cLCD driver unloaded.\x1b[Lc\x1b[Lb\x1b[L-");  in charlcd_unregister()
673 	if (lcd->ops->backlight) {  in charlcd_unregister()
675 		priv->lcd.ops->backlight(&priv->lcd, CHARLCD_OFF);  in charlcd_unregister()
682 MODULE_DESCRIPTION("Character LCD core support");