Lines Matching +full:lcd +full:- +full:backlight
1 // SPDX-License-Identifier: GPL-2.0+
3 * Character LCD driver for Linux
5 * Copyright (C) 2000-2008, Willy Tarreau <w@1wt.eu>
6 * Copyright (C) 2016-2017 Glider bvba
30 /* Keep the backlight on this many seconds for each flash */
37 #define LCD_FLAG_N 0x0040 /* 2-rows mode */
38 #define LCD_FLAG_L 0x0080 /* Backlight enabled */
40 /* LCD commands */
64 #define LCD_ESCAPE_LEN 24 /* Max chars for LCD escape command */
68 struct charlcd lcd; member
76 /* contains the LCD config state */
79 /* Contains the LCD X and Y offset */
85 /* Current escape sequence and it's length or -1 if outside */
94 #define to_priv(p) container_of(p, struct charlcd_priv, lcd)
96 /* Device single-open policy control */
105 /* turn the backlight on or off */
106 static void charlcd_backlight(struct charlcd *lcd, int on) in charlcd_backlight() argument
108 struct charlcd_priv *priv = to_priv(lcd); in charlcd_backlight()
110 if (!lcd->ops->backlight) in charlcd_backlight()
113 mutex_lock(&priv->bl_tempo_lock); in charlcd_backlight()
114 if (!priv->bl_tempo) in charlcd_backlight()
115 lcd->ops->backlight(lcd, on); in charlcd_backlight()
116 mutex_unlock(&priv->bl_tempo_lock); in charlcd_backlight()
125 mutex_lock(&priv->bl_tempo_lock); in charlcd_bl_off()
126 if (priv->bl_tempo) { in charlcd_bl_off()
127 priv->bl_tempo = false; in charlcd_bl_off()
128 if (!(priv->flags & LCD_FLAG_L)) in charlcd_bl_off()
129 priv->lcd.ops->backlight(&priv->lcd, 0); in charlcd_bl_off()
131 mutex_unlock(&priv->bl_tempo_lock); in charlcd_bl_off()
134 /* turn the backlight on for a little while */
135 void charlcd_poke(struct charlcd *lcd) in charlcd_poke() argument
137 struct charlcd_priv *priv = to_priv(lcd); in charlcd_poke()
139 if (!lcd->ops->backlight) in charlcd_poke()
142 cancel_delayed_work_sync(&priv->bl_work); in charlcd_poke()
144 mutex_lock(&priv->bl_tempo_lock); in charlcd_poke()
145 if (!priv->bl_tempo && !(priv->flags & LCD_FLAG_L)) in charlcd_poke()
146 lcd->ops->backlight(lcd, 1); in charlcd_poke()
147 priv->bl_tempo = true; in charlcd_poke()
148 schedule_delayed_work(&priv->bl_work, LCD_BL_TEMPO_PERIOD * HZ); in charlcd_poke()
149 mutex_unlock(&priv->bl_tempo_lock); in charlcd_poke()
153 static void charlcd_gotoxy(struct charlcd *lcd) in charlcd_gotoxy() argument
155 struct charlcd_priv *priv = to_priv(lcd); in charlcd_gotoxy()
162 addr = priv->addr.x < lcd->bwidth ? priv->addr.x & (lcd->hwidth - 1) in charlcd_gotoxy()
163 : lcd->bwidth - 1; in charlcd_gotoxy()
164 if (priv->addr.y & 1) in charlcd_gotoxy()
165 addr += lcd->hwidth; in charlcd_gotoxy()
166 if (priv->addr.y & 2) in charlcd_gotoxy()
167 addr += lcd->bwidth; in charlcd_gotoxy()
168 lcd->ops->write_cmd(lcd, LCD_CMD_SET_DDRAM_ADDR | addr); in charlcd_gotoxy()
171 static void charlcd_home(struct charlcd *lcd) in charlcd_home() argument
173 struct charlcd_priv *priv = to_priv(lcd); in charlcd_home()
175 priv->addr.x = 0; in charlcd_home()
176 priv->addr.y = 0; in charlcd_home()
177 charlcd_gotoxy(lcd); in charlcd_home()
180 static void charlcd_print(struct charlcd *lcd, char c) in charlcd_print() argument
182 struct charlcd_priv *priv = to_priv(lcd); in charlcd_print()
184 if (priv->addr.x < lcd->bwidth) { in charlcd_print()
185 if (lcd->char_conv) in charlcd_print()
186 c = lcd->char_conv[(unsigned char)c]; in charlcd_print()
187 lcd->ops->write_data(lcd, c); in charlcd_print()
188 priv->addr.x++; in charlcd_print()
191 if (priv->addr.x == lcd->bwidth) in charlcd_print()
192 charlcd_gotoxy(lcd); in charlcd_print()
196 static void charlcd_clear_fast(struct charlcd *lcd) in charlcd_clear_fast() argument
200 charlcd_home(lcd); in charlcd_clear_fast()
202 if (lcd->ops->clear_fast) in charlcd_clear_fast()
203 lcd->ops->clear_fast(lcd); in charlcd_clear_fast()
205 for (pos = 0; pos < min(2, lcd->height) * lcd->hwidth; pos++) in charlcd_clear_fast()
206 lcd->ops->write_data(lcd, ' '); in charlcd_clear_fast()
208 charlcd_home(lcd); in charlcd_clear_fast()
212 static void charlcd_clear_display(struct charlcd *lcd) in charlcd_clear_display() argument
214 struct charlcd_priv *priv = to_priv(lcd); in charlcd_clear_display()
216 lcd->ops->write_cmd(lcd, LCD_CMD_DISPLAY_CLEAR); in charlcd_clear_display()
217 priv->addr.x = 0; in charlcd_clear_display()
218 priv->addr.y = 0; in charlcd_clear_display()
223 static int charlcd_init_display(struct charlcd *lcd) in charlcd_init_display() argument
225 void (*write_cmd_raw)(struct charlcd *lcd, int cmd); in charlcd_init_display()
226 struct charlcd_priv *priv = to_priv(lcd); in charlcd_init_display()
229 if (lcd->ifwidth != 4 && lcd->ifwidth != 8) in charlcd_init_display()
230 return -EINVAL; in charlcd_init_display()
232 priv->flags = ((lcd->height > 1) ? LCD_FLAG_N : 0) | LCD_FLAG_D | in charlcd_init_display()
235 long_sleep(20); /* wait 20 ms after power-up for the paranoid */ in charlcd_init_display()
238 * 8-bit mode, 1 line, small fonts; let's do it 3 times, to make sure in charlcd_init_display()
239 * the LCD is in 8-bit mode afterwards in charlcd_init_display()
242 if (lcd->ifwidth == 4) { in charlcd_init_display()
244 write_cmd_raw = lcd->ops->write_cmd_raw4; in charlcd_init_display()
246 write_cmd_raw = lcd->ops->write_cmd; in charlcd_init_display()
248 write_cmd_raw(lcd, init); in charlcd_init_display()
250 write_cmd_raw(lcd, init); in charlcd_init_display()
252 write_cmd_raw(lcd, init); in charlcd_init_display()
255 if (lcd->ifwidth == 4) { in charlcd_init_display()
256 /* Switch to 4-bit mode, 1 line, small fonts */ in charlcd_init_display()
257 lcd->ops->write_cmd_raw4(lcd, LCD_CMD_FUNCTION_SET >> 4); in charlcd_init_display()
262 lcd->ops->write_cmd(lcd, in charlcd_init_display()
264 ((lcd->ifwidth == 8) ? LCD_CMD_DATA_LEN_8BITS : 0) | in charlcd_init_display()
265 ((priv->flags & LCD_FLAG_F) ? LCD_CMD_FONT_5X10_DOTS : 0) | in charlcd_init_display()
266 ((priv->flags & LCD_FLAG_N) ? LCD_CMD_TWO_LINES : 0)); in charlcd_init_display()
270 lcd->ops->write_cmd(lcd, LCD_CMD_DISPLAY_CTRL); in charlcd_init_display()
273 lcd->ops->write_cmd(lcd, in charlcd_init_display()
275 ((priv->flags & LCD_FLAG_D) ? LCD_CMD_DISPLAY_ON : 0) | in charlcd_init_display()
276 ((priv->flags & LCD_FLAG_C) ? LCD_CMD_CURSOR_ON : 0) | in charlcd_init_display()
277 ((priv->flags & LCD_FLAG_B) ? LCD_CMD_BLINK_ON : 0)); in charlcd_init_display()
279 charlcd_backlight(lcd, (priv->flags & LCD_FLAG_L) ? 1 : 0); in charlcd_init_display()
284 lcd->ops->write_cmd(lcd, LCD_CMD_ENTRY_MODE | LCD_CMD_CURSOR_INC); in charlcd_init_display()
286 charlcd_clear_display(lcd); in charlcd_init_display()
291 * Parses an unsigned integer from a string, until a non-digit character
307 *res = *res * 10 + (*s - '0'); in parse_n()
317 * any number of subcommands of the form "(x|y)[0-9]+".
323 * - ";" returns (<original x>, <original y>).
324 * - "x1;" returns (1, <original y>).
325 * - "y2x1;" returns (1, 2).
326 * - "x12y34x56;" returns (56, 34).
327 * - "" fails.
328 * - "x" fails.
329 * - "x;" fails.
330 * - "x1" fails.
331 * - "xy12;" fails.
332 * - "x12yy12;" fails.
333 * - "xx" fails.
364 * These are the file operation function for user access to /dev/lcd
370 static inline int handle_lcd_special_code(struct charlcd *lcd) in handle_lcd_special_code() argument
372 struct charlcd_priv *priv = to_priv(lcd); in handle_lcd_special_code()
374 /* LCD special codes */ in handle_lcd_special_code()
378 char *esc = priv->esc_seq.buf + 2; in handle_lcd_special_code()
379 int oldflags = priv->flags; in handle_lcd_special_code()
384 priv->flags |= LCD_FLAG_D; in handle_lcd_special_code()
388 priv->flags &= ~LCD_FLAG_D; in handle_lcd_special_code()
392 priv->flags |= LCD_FLAG_C; in handle_lcd_special_code()
396 priv->flags &= ~LCD_FLAG_C; in handle_lcd_special_code()
400 priv->flags |= LCD_FLAG_B; in handle_lcd_special_code()
404 priv->flags &= ~LCD_FLAG_B; in handle_lcd_special_code()
408 priv->flags |= LCD_FLAG_L; in handle_lcd_special_code()
411 case '-': /* Back light OFF */ in handle_lcd_special_code()
412 priv->flags &= ~LCD_FLAG_L; in handle_lcd_special_code()
416 charlcd_poke(lcd); in handle_lcd_special_code()
420 priv->flags &= ~LCD_FLAG_F; in handle_lcd_special_code()
424 priv->flags |= LCD_FLAG_F; in handle_lcd_special_code()
428 priv->flags &= ~LCD_FLAG_N; in handle_lcd_special_code()
432 priv->flags |= LCD_FLAG_N; in handle_lcd_special_code()
436 if (priv->addr.x > 0) { in handle_lcd_special_code()
438 if (priv->addr.x < lcd->bwidth) in handle_lcd_special_code()
439 lcd->ops->write_cmd(lcd, LCD_CMD_SHIFT); in handle_lcd_special_code()
440 priv->addr.x--; in handle_lcd_special_code()
445 if (priv->addr.x < lcd->width) { in handle_lcd_special_code()
447 if (priv->addr.x < (lcd->bwidth - 1)) in handle_lcd_special_code()
448 lcd->ops->write_cmd(lcd, in handle_lcd_special_code()
450 priv->addr.x++; in handle_lcd_special_code()
455 lcd->ops->write_cmd(lcd, LCD_CMD_SHIFT | LCD_CMD_DISPLAY_SHIFT); in handle_lcd_special_code()
459 lcd->ops->write_cmd(lcd, in handle_lcd_special_code()
467 for (x = priv->addr.x; x < lcd->bwidth; x++) in handle_lcd_special_code()
468 lcd->ops->write_data(lcd, ' '); in handle_lcd_special_code()
471 charlcd_gotoxy(lcd); in handle_lcd_special_code()
476 charlcd_init_display(lcd); in handle_lcd_special_code()
500 cgaddr = *(esc++) - '0'; in handle_lcd_special_code()
512 value |= (*esc - '0') << shift; in handle_lcd_special_code()
514 value |= (*esc - 'A' + 10) << shift; in handle_lcd_special_code()
516 value |= (*esc - 'a' + 10) << shift; in handle_lcd_special_code()
530 lcd->ops->write_cmd(lcd, LCD_CMD_SET_CGRAM_ADDR | (cgaddr * 8)); in handle_lcd_special_code()
532 lcd->ops->write_data(lcd, cgbytes[addr]); in handle_lcd_special_code()
535 charlcd_gotoxy(lcd); in handle_lcd_special_code()
541 if (priv->esc_seq.buf[priv->esc_seq.len - 1] != ';') in handle_lcd_special_code()
545 if (parse_xy(esc, &priv->addr.x, &priv->addr.y)) in handle_lcd_special_code()
546 charlcd_gotoxy(lcd); in handle_lcd_special_code()
555 if (oldflags == priv->flags) in handle_lcd_special_code()
559 if ((oldflags ^ priv->flags) & in handle_lcd_special_code()
562 lcd->ops->write_cmd(lcd, in handle_lcd_special_code()
564 ((priv->flags & LCD_FLAG_D) ? LCD_CMD_DISPLAY_ON : 0) | in handle_lcd_special_code()
565 ((priv->flags & LCD_FLAG_C) ? LCD_CMD_CURSOR_ON : 0) | in handle_lcd_special_code()
566 ((priv->flags & LCD_FLAG_B) ? LCD_CMD_BLINK_ON : 0)); in handle_lcd_special_code()
568 else if ((oldflags ^ priv->flags) & (LCD_FLAG_F | LCD_FLAG_N)) in handle_lcd_special_code()
569 lcd->ops->write_cmd(lcd, in handle_lcd_special_code()
571 ((lcd->ifwidth == 8) ? LCD_CMD_DATA_LEN_8BITS : 0) | in handle_lcd_special_code()
572 ((priv->flags & LCD_FLAG_F) ? LCD_CMD_FONT_5X10_DOTS : 0) | in handle_lcd_special_code()
573 ((priv->flags & LCD_FLAG_N) ? LCD_CMD_TWO_LINES : 0)); in handle_lcd_special_code()
575 else if ((oldflags ^ priv->flags) & LCD_FLAG_L) in handle_lcd_special_code()
576 charlcd_backlight(lcd, !!(priv->flags & LCD_FLAG_L)); in handle_lcd_special_code()
581 static void charlcd_write_char(struct charlcd *lcd, char c) in charlcd_write_char() argument
583 struct charlcd_priv *priv = to_priv(lcd); in charlcd_write_char()
586 if ((c != '\n') && priv->esc_seq.len >= 0) { in charlcd_write_char()
588 priv->esc_seq.buf[priv->esc_seq.len++] = c; in charlcd_write_char()
589 priv->esc_seq.buf[priv->esc_seq.len] = '\0'; in charlcd_write_char()
592 priv->esc_seq.len = -1; in charlcd_write_char()
597 priv->esc_seq.len = 0; in charlcd_write_char()
598 priv->esc_seq.buf[priv->esc_seq.len] = '\0'; in charlcd_write_char()
602 if (priv->addr.x > 0) { in charlcd_write_char()
607 if (priv->addr.x < lcd->bwidth) in charlcd_write_char()
609 lcd->ops->write_cmd(lcd, LCD_CMD_SHIFT); in charlcd_write_char()
610 priv->addr.x--; in charlcd_write_char()
613 lcd->ops->write_data(lcd, ' '); in charlcd_write_char()
615 lcd->ops->write_cmd(lcd, LCD_CMD_SHIFT); in charlcd_write_char()
619 charlcd_clear_fast(lcd); in charlcd_write_char()
626 for (; priv->addr.x < lcd->bwidth; priv->addr.x++) in charlcd_write_char()
627 lcd->ops->write_data(lcd, ' '); in charlcd_write_char()
628 priv->addr.x = 0; in charlcd_write_char()
629 priv->addr.y = (priv->addr.y + 1) % lcd->height; in charlcd_write_char()
630 charlcd_gotoxy(lcd); in charlcd_write_char()
634 priv->addr.x = 0; in charlcd_write_char()
635 charlcd_gotoxy(lcd); in charlcd_write_char()
639 charlcd_print(lcd, ' '); in charlcd_write_char()
643 charlcd_print(lcd, c); in charlcd_write_char()
652 if (priv->esc_seq.len >= 2) { in charlcd_write_char()
655 if (!strcmp(priv->esc_seq.buf, "[2J")) { in charlcd_write_char()
657 charlcd_clear_fast(lcd); in charlcd_write_char()
659 } else if (!strcmp(priv->esc_seq.buf, "[H")) { in charlcd_write_char()
661 charlcd_home(lcd); in charlcd_write_char()
665 else if ((priv->esc_seq.len >= 3) && in charlcd_write_char()
666 (priv->esc_seq.buf[0] == '[') && in charlcd_write_char()
667 (priv->esc_seq.buf[1] == 'L')) { in charlcd_write_char()
668 processed = handle_lcd_special_code(lcd); in charlcd_write_char()
671 /* LCD special escape codes */ in charlcd_write_char()
676 if (processed || (priv->esc_seq.len >= LCD_ESCAPE_LEN)) in charlcd_write_char()
677 priv->esc_seq.len = -1; in charlcd_write_char()
689 for (; count-- > 0; (*ppos)++, tmp++) { in charlcd_write()
698 return -EFAULT; in charlcd_write()
703 return tmp - buf; in charlcd_write()
711 ret = -EBUSY; in charlcd_open()
715 ret = -EPERM; in charlcd_open()
716 if (file->f_mode & FMODE_READ) /* device is write-only */ in charlcd_open()
719 if (priv->must_clear) { in charlcd_open()
720 charlcd_clear_display(&priv->lcd); in charlcd_open()
721 priv->must_clear = false; in charlcd_open()
745 .name = "lcd",
749 static void charlcd_puts(struct charlcd *lcd, const char *s) in charlcd_puts() argument
754 for (; count-- > 0; tmp++) { in charlcd_puts()
762 charlcd_write_char(lcd, *tmp); in charlcd_puts()
766 /* initialize the LCD driver */
767 static int charlcd_init(struct charlcd *lcd) in charlcd_init() argument
769 struct charlcd_priv *priv = to_priv(lcd); in charlcd_init()
772 if (lcd->ops->backlight) { in charlcd_init()
773 mutex_init(&priv->bl_tempo_lock); in charlcd_init()
774 INIT_DELAYED_WORK(&priv->bl_work, charlcd_bl_off); in charlcd_init()
780 * enable mark the LCD initialized just before. in charlcd_init()
782 ret = charlcd_init_display(lcd); in charlcd_init()
789 charlcd_puts(lcd, "\x1b[Lc\x1b[Lb\x1b[L*" CONFIG_PANEL_BOOT_MESSAGE); in charlcd_init()
792 charlcd_puts(lcd, "\x1b[Lc\x1b[Lb\x1b[L*Linux-" UTS_RELEASE "\n"); in charlcd_init()
795 priv->must_clear = true; in charlcd_init()
796 charlcd_home(lcd); in charlcd_init()
803 struct charlcd *lcd; in charlcd_alloc() local
809 priv->esc_seq.len = -1; in charlcd_alloc()
811 lcd = &priv->lcd; in charlcd_alloc()
812 lcd->ifwidth = 8; in charlcd_alloc()
813 lcd->bwidth = DEFAULT_LCD_BWIDTH; in charlcd_alloc()
814 lcd->hwidth = DEFAULT_LCD_HWIDTH; in charlcd_alloc()
815 lcd->drvdata = priv->drvdata; in charlcd_alloc()
817 return lcd; in charlcd_alloc()
824 struct charlcd *lcd = the_charlcd; in panel_notify_sys() local
828 charlcd_puts(lcd, in panel_notify_sys()
832 charlcd_puts(lcd, "\x0cSystem Halted.\x1b[Lc\x1b[Lb\x1b[L+"); in panel_notify_sys()
835 charlcd_puts(lcd, "\x0cPower off.\x1b[Lc\x1b[Lb\x1b[L+"); in panel_notify_sys()
849 int charlcd_register(struct charlcd *lcd) in charlcd_register() argument
853 ret = charlcd_init(lcd); in charlcd_register()
861 the_charlcd = lcd; in charlcd_register()
867 int charlcd_unregister(struct charlcd *lcd) in charlcd_unregister() argument
869 struct charlcd_priv *priv = to_priv(lcd); in charlcd_unregister()
872 charlcd_puts(lcd, "\x0cLCD driver unloaded.\x1b[Lc\x1b[Lb\x1b[L-"); in charlcd_unregister()
875 if (lcd->ops->backlight) { in charlcd_unregister()
876 cancel_delayed_work_sync(&priv->bl_work); in charlcd_unregister()
877 priv->lcd.ops->backlight(&priv->lcd, 0); in charlcd_unregister()