3  * Character LCD driver for Linux
38 /* LCD commands */
62 #define LCD_ESCAPE_LEN		24	/* Max chars for LCD escape command */
66 	struct charlcd lcd;  member
74 	/* contains the LCD config state */
77 	/* Contains the LCD X and Y offset */
92 #define charlcd_to_priv(p)	container_of(p, struct charlcd_priv, lcd)
104 static void charlcd_backlight(struct charlcd *lcd, int on)  in charlcd_backlight()  argument
106 	struct charlcd_priv *priv = charlcd_to_priv(lcd);  in charlcd_backlight()
108 	if (!lcd->ops->backlight)  in charlcd_backlight()
113 		lcd->ops->backlight(lcd, on);  in charlcd_backlight()
127 			priv->lcd.ops->backlight(&priv->lcd, 0);  in charlcd_bl_off()
133 void charlcd_poke(struct charlcd *lcd)  in charlcd_poke()  argument
135 	struct charlcd_priv *priv = charlcd_to_priv(lcd);  in charlcd_poke()
137 	if (!lcd->ops->backlight)  in charlcd_poke()
144 		lcd->ops->backlight(lcd, 1);  in charlcd_poke()
151 static void charlcd_gotoxy(struct charlcd *lcd)  in charlcd_gotoxy()  argument
153 	struct charlcd_priv *priv = charlcd_to_priv(lcd);  in charlcd_gotoxy()
160 	addr = priv->addr.x < lcd->bwidth ? priv->addr.x & (lcd->hwidth - 1)  in charlcd_gotoxy()
161 					  : lcd->bwidth - 1;  in charlcd_gotoxy()
163 		addr += lcd->hwidth;  in charlcd_gotoxy()
165 		addr += lcd->bwidth;  in charlcd_gotoxy()
166 	lcd->ops->write_cmd(lcd, LCD_CMD_SET_DDRAM_ADDR | addr);  in charlcd_gotoxy()
169 static void charlcd_home(struct charlcd *lcd)  in charlcd_home()  argument
171 	struct charlcd_priv *priv = charlcd_to_priv(lcd);  in charlcd_home()
175 	charlcd_gotoxy(lcd);  in charlcd_home()
178 static void charlcd_print(struct charlcd *lcd, char c)  in charlcd_print()  argument
180 	struct charlcd_priv *priv = charlcd_to_priv(lcd);  in charlcd_print()
182 	if (priv->addr.x < lcd->bwidth) {  in charlcd_print()
183 		if (lcd->char_conv)  in charlcd_print()
184 			c = lcd->char_conv[(unsigned char)c];  in charlcd_print()
185 		lcd->ops->write_data(lcd, c);  in charlcd_print()
189 		if (priv->addr.x == lcd->bwidth)  in charlcd_print()
190 			charlcd_gotoxy(lcd);  in charlcd_print()
194 static void charlcd_clear_fast(struct charlcd *lcd)  in charlcd_clear_fast()  argument
198 	charlcd_home(lcd);  in charlcd_clear_fast()
200 	if (lcd->ops->clear_fast)  in charlcd_clear_fast()
201 		lcd->ops->clear_fast(lcd);  in charlcd_clear_fast()
203 		for (pos = 0; pos < min(2, lcd->height) * lcd->hwidth; pos++)  in charlcd_clear_fast()
204 			lcd->ops->write_data(lcd, ' ');  in charlcd_clear_fast()
206 	charlcd_home(lcd);  in charlcd_clear_fast()
210 static void charlcd_clear_display(struct charlcd *lcd)  in charlcd_clear_display()  argument
212 	struct charlcd_priv *priv = charlcd_to_priv(lcd);  in charlcd_clear_display()
214 	lcd->ops->write_cmd(lcd, LCD_CMD_DISPLAY_CLEAR);  in charlcd_clear_display()
221 static int charlcd_init_display(struct charlcd *lcd)  in charlcd_init_display()  argument
223 	void (*write_cmd_raw)(struct charlcd *lcd, int cmd);  in charlcd_init_display()
224 	struct charlcd_priv *priv = charlcd_to_priv(lcd);  in charlcd_init_display()
227 	if (lcd->ifwidth != 4 && lcd->ifwidth != 8)  in charlcd_init_display()
230 	priv->flags = ((lcd->height > 1) ? LCD_FLAG_N : 0) | LCD_FLAG_D |  in charlcd_init_display()
237 	 * the LCD is in 8-bit mode afterwards  in charlcd_init_display()
240 	if (lcd->ifwidth == 4) {  in charlcd_init_display()
242 		write_cmd_raw = lcd->ops->write_cmd_raw4;  in charlcd_init_display()
244 		write_cmd_raw = lcd->ops->write_cmd;  in charlcd_init_display()
246 	write_cmd_raw(lcd, init);  in charlcd_init_display()
248 	write_cmd_raw(lcd, init);  in charlcd_init_display()
250 	write_cmd_raw(lcd, init);  in charlcd_init_display()
253 	if (lcd->ifwidth == 4) {  in charlcd_init_display()
255 		lcd->ops->write_cmd_raw4(lcd, LCD_CMD_FUNCTION_SET >> 4);  in charlcd_init_display()
260 	lcd->ops->write_cmd(lcd,  in charlcd_init_display()
262 		((lcd->ifwidth == 8) ? LCD_CMD_DATA_LEN_8BITS : 0) |  in charlcd_init_display()
268 	lcd->ops->write_cmd(lcd, LCD_CMD_DISPLAY_CTRL);  in charlcd_init_display()
271 	lcd->ops->write_cmd(lcd,  in charlcd_init_display()
277 	charlcd_backlight(lcd, (priv->flags & LCD_FLAG_L) ? 1 : 0);  in charlcd_init_display()
282 	lcd->ops->write_cmd(lcd, LCD_CMD_ENTRY_MODE | LCD_CMD_CURSOR_INC);  in charlcd_init_display()
284 	charlcd_clear_display(lcd);  in charlcd_init_display()
342  * These are the file operation function for user access to /dev/lcd
348 static inline int handle_lcd_special_code(struct charlcd *lcd)  in handle_lcd_special_code()  argument
350 	struct charlcd_priv *priv = charlcd_to_priv(lcd);  in handle_lcd_special_code()
352 	/* LCD special codes */  in handle_lcd_special_code()
394 		charlcd_poke(lcd);  in handle_lcd_special_code()
416 			if (priv->addr.x < lcd->bwidth)  in handle_lcd_special_code()
417 				lcd->ops->write_cmd(lcd, LCD_CMD_SHIFT);  in handle_lcd_special_code()
423 		if (priv->addr.x < lcd->width) {  in handle_lcd_special_code()
425 			if (priv->addr.x < (lcd->bwidth - 1))  in handle_lcd_special_code()
426 				lcd->ops->write_cmd(lcd,  in handle_lcd_special_code()
433 		lcd->ops->write_cmd(lcd, LCD_CMD_SHIFT | LCD_CMD_DISPLAY_SHIFT);  in handle_lcd_special_code()
437 		lcd->ops->write_cmd(lcd,  in handle_lcd_special_code()
445 		for (x = priv->addr.x; x < lcd->bwidth; x++)  in handle_lcd_special_code()
446 			lcd->ops->write_data(lcd, ' ');  in handle_lcd_special_code()
449 		charlcd_gotoxy(lcd);  in handle_lcd_special_code()
454 		charlcd_init_display(lcd);  in handle_lcd_special_code()
503 		lcd->ops->write_cmd(lcd, LCD_CMD_SET_CGRAM_ADDR | (cgaddr * 8));  in handle_lcd_special_code()
505 			lcd->ops->write_data(lcd, cgbytes[addr]);  in handle_lcd_special_code()
508 		charlcd_gotoxy(lcd);  in handle_lcd_special_code()
519 			charlcd_gotoxy(lcd);  in handle_lcd_special_code()
535 		lcd->ops->write_cmd(lcd,  in handle_lcd_special_code()
542 		lcd->ops->write_cmd(lcd,  in handle_lcd_special_code()
544 			((lcd->ifwidth == 8) ? LCD_CMD_DATA_LEN_8BITS : 0) |  in handle_lcd_special_code()
549 		charlcd_backlight(lcd, !!(priv->flags & LCD_FLAG_L));  in handle_lcd_special_code()
554 static void charlcd_write_char(struct charlcd *lcd, char c)  in charlcd_write_char()  argument
556 	struct charlcd_priv *priv = charlcd_to_priv(lcd);  in charlcd_write_char()
580 				if (priv->addr.x < lcd->bwidth)  in charlcd_write_char()
582 					lcd->ops->write_cmd(lcd, LCD_CMD_SHIFT);  in charlcd_write_char()
586 			lcd->ops->write_data(lcd, ' ');  in charlcd_write_char()
588 			lcd->ops->write_cmd(lcd, LCD_CMD_SHIFT);  in charlcd_write_char()
592 			charlcd_clear_fast(lcd);  in charlcd_write_char()
599 			for (; priv->addr.x < lcd->bwidth; priv->addr.x++)  in charlcd_write_char()
600 				lcd->ops->write_data(lcd, ' ');  in charlcd_write_char()
602 			priv->addr.y = (priv->addr.y + 1) % lcd->height;  in charlcd_write_char()
603 			charlcd_gotoxy(lcd);  in charlcd_write_char()
608 			charlcd_gotoxy(lcd);  in charlcd_write_char()
612 			charlcd_print(lcd, ' ');  in charlcd_write_char()
616 			charlcd_print(lcd, c);  in charlcd_write_char()
630 			charlcd_clear_fast(lcd);  in charlcd_write_char()
634 			charlcd_home(lcd);  in charlcd_write_char()
641 			processed = handle_lcd_special_code(lcd);  in charlcd_write_char()
644 		/* LCD special escape codes */  in charlcd_write_char()
693 		charlcd_clear_display(&priv->lcd);  in charlcd_open()
718 	.name	= "lcd",
722 static void charlcd_puts(struct charlcd *lcd, const char *s)  in charlcd_puts()  argument
735 		charlcd_write_char(lcd, *tmp);  in charlcd_puts()
753 /* initialize the LCD driver */
754 static int charlcd_init(struct charlcd *lcd)  in charlcd_init()  argument
756 	struct charlcd_priv *priv = charlcd_to_priv(lcd);  in charlcd_init()
759 	if (lcd->ops->backlight) {  in charlcd_init()
767 	 * enable mark the LCD initialized just before.  in charlcd_init()
769 	ret = charlcd_init_display(lcd);  in charlcd_init()
774 	charlcd_puts(lcd, "\x1b[Lc\x1b[Lb" LCD_INIT_BL LCD_INIT_TEXT);  in charlcd_init()
778 	charlcd_home(lcd);  in charlcd_init()
785 	struct charlcd *lcd;  in charlcd_alloc()  local
793 	lcd = &priv->lcd;  in charlcd_alloc()
794 	lcd->ifwidth = 8;  in charlcd_alloc()
795 	lcd->bwidth = DEFAULT_LCD_BWIDTH;  in charlcd_alloc()
796 	lcd->hwidth = DEFAULT_LCD_HWIDTH;  in charlcd_alloc()
797 	lcd->drvdata = priv->drvdata;  in charlcd_alloc()
799 	return lcd;  in charlcd_alloc()
803 void charlcd_free(struct charlcd *lcd)  in charlcd_free()  argument
805 	kfree(charlcd_to_priv(lcd));  in charlcd_free()
812 	struct charlcd *lcd = the_charlcd;  in panel_notify_sys()  local
816 		charlcd_puts(lcd,  in panel_notify_sys()
820 		charlcd_puts(lcd, "\x0cSystem Halted.\x1b[Lc\x1b[Lb\x1b[L+");  in panel_notify_sys()
823 		charlcd_puts(lcd, "\x0cPower off.\x1b[Lc\x1b[Lb\x1b[L+");  in panel_notify_sys()
837 int charlcd_register(struct charlcd *lcd)  in charlcd_register()  argument
841 	ret = charlcd_init(lcd);  in charlcd_register()
849 	the_charlcd = lcd;  in charlcd_register()
855 int charlcd_unregister(struct charlcd *lcd)  in charlcd_unregister()  argument
857 	struct charlcd_priv *priv = charlcd_to_priv(lcd);  in charlcd_unregister()
860 	charlcd_puts(lcd, "\x0cLCD driver unloaded.\x1b[Lc\x1b[Lb\x1b[L-");  in charlcd_unregister()
863 	if (lcd->ops->backlight) {  in charlcd_unregister()
865 		priv->lcd.ops->backlight(&priv->lcd, 0);  in charlcd_unregister()