2 * ld9040 AMOLED LCD panel driver.
4 * Copyright (c) 2011 Samsung Electronics
5 * Author: Donghwa Lee <dh09.lee@samsung.com>
6 * Derived from drivers/video/backlight/s6e63m0.c
8 * This program is free software; you can redistribute it and/or modify it
9 * under the terms of the GNU General Public License as published by the
10 * Free Software Foundation; either version 2 of the License, or (at your
11 * option) any later version.
13 * This program is distributed in the hope that it will be useful, but
14 * WITHOUT ANY WARRANTY; without even the implied warranty of
15 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
16 * General Public License for more details.
18 * You should have received a copy of the GNU General Public License along
19 * with this program; if not, write to the Free Software Foundation, Inc.,
20 * 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA.
23 #include <linux/wait.h>
25 #include <linux/delay.h>
26 #include <linux/gpio.h>
27 #include <linux/spi/spi.h>
28 #include <linux/irq.h>
29 #include <linux/interrupt.h>
30 #include <linux/kernel.h>
31 #include <linux/lcd.h>
32 #include <linux/backlight.h>
34 #include "ld9040_gamma.h"
36 #define SLEEPMSEC 0x1000
38 #define DEFMASK 0xFF00
39 #define COMMAND_ONLY 0xFE
40 #define DATA_ONLY 0xFF
42 #define MIN_BRIGHTNESS 0
43 #define MAX_BRIGHTNESS 24
44 #define power_is_on(pwr) ((pwr) <= FB_BLANK_NORMAL)
48 struct spi_device *spi;
50 unsigned int current_brightness;
52 struct lcd_device *ld;
53 struct backlight_device *bd;
54 struct lcd_platform_data *lcd_pd;
57 static const unsigned short seq_swreset[] = {
62 static const unsigned short seq_user_setting[] = {
69 static const unsigned short seq_elvss_on[] = {
77 static const unsigned short seq_gtcon[] = {
85 static const unsigned short seq_panel_condition[] = {
113 static const unsigned short seq_gamma_set1[] = {
139 static const unsigned short seq_gamma_ctrl[] = {
146 static const unsigned short seq_gamma_start[] = {
152 static const unsigned short seq_apon[] = {
162 static const unsigned short seq_display_ctrl[] = {
172 static const unsigned short seq_manual_pwr[] = {
177 static const unsigned short seq_pwr_ctrl[] = {
189 static const unsigned short seq_sleep_out[] = {
194 static const unsigned short seq_sleep_in[] = {
199 static const unsigned short seq_display_on[] = {
204 static const unsigned short seq_display_off[] = {
209 static const unsigned short seq_vci1_1st_en[] = {
219 static const unsigned short seq_vl1_en[] = {
229 static const unsigned short seq_vl2_en[] = {
239 static const unsigned short seq_vci1_2nd_en[] = {
249 static const unsigned short seq_vl3_en[] = {
259 static const unsigned short seq_vreg1_amp_en[] = {
269 static const unsigned short seq_vgh_amp_en[] = {
279 static const unsigned short seq_vgl_amp_en[] = {
289 static const unsigned short seq_vmos_amp_en[] = {
299 static const unsigned short seq_vint_amp_en[] = {
303 /* DATA_ONLY, 0x71, VMOS/VBL/VBH not used */
307 /* DATA_ONLY, 0x02, VMOS/VBL/VBH not used */
311 static const unsigned short seq_vbh_amp_en[] = {
321 static const unsigned short seq_vbl_amp_en[] = {
331 static const unsigned short seq_gam_amp_en[] = {
335 /* DATA_ONLY, 0x73, VMOS/VBL/VBH not used */
339 /* DATA_ONLY, 0x02, VMOS/VBL/VBH not used */
343 static const unsigned short seq_sd_amp_en[] = {
347 /* DATA_ONLY, 0x73, VMOS/VBL/VBH not used */
351 /* DATA_ONLY, 0x02, VMOS/VBL/VBH not used */
355 static const unsigned short seq_gls_en[] = {
359 /* DATA_ONLY, 0x73, VMOS/VBL/VBH not used */
363 /* DATA_ONLY, 0x02, VMOS/VBL/VBH not used */
367 static const unsigned short seq_els_en[] = {
371 /* DATA_ONLY, 0x73, VMOS/VBL/VBH not used */
375 /* DATA_ONLY, 0x02, VMOS/VBL/VBH not used */
379 static const unsigned short seq_el_on[] = {
383 /* DATA_ONLY, 0x73, VMOS/VBL/VBH not used */
387 /* DATA_ONLY, 0x02, VMOS/VBL/VBH not used */
391 static int ld9040_spi_write_byte(struct ld9040 *lcd, int addr, int data)
394 struct spi_message msg;
396 struct spi_transfer xfer = {
401 buf[0] = (addr << 8) | data;
403 spi_message_init(&msg);
404 spi_message_add_tail(&xfer, &msg);
406 return spi_sync(lcd->spi, &msg);
409 static int ld9040_spi_write(struct ld9040 *lcd, unsigned char address,
410 unsigned char command)
414 if (address != DATA_ONLY)
415 ret = ld9040_spi_write_byte(lcd, 0x0, address);
416 if (command != COMMAND_ONLY)
417 ret = ld9040_spi_write_byte(lcd, 0x1, command);
422 static int ld9040_panel_send_sequence(struct ld9040 *lcd,
423 const unsigned short *wbuf)
427 while ((wbuf[i] & DEFMASK) != ENDDEF) {
428 if ((wbuf[i] & DEFMASK) != SLEEPMSEC) {
429 ret = ld9040_spi_write(lcd, wbuf[i], wbuf[i+1]);
433 udelay(wbuf[i+1]*1000);
440 static int _ld9040_gamma_ctl(struct ld9040 *lcd, const unsigned int *gamma)
445 /* start gamma table updating. */
446 ret = ld9040_panel_send_sequence(lcd, seq_gamma_start);
448 dev_err(lcd->dev, "failed to disable gamma table updating.\n");
452 for (i = 0 ; i < GAMMA_TABLE_COUNT; i++) {
453 ret = ld9040_spi_write(lcd, DATA_ONLY, gamma[i]);
455 dev_err(lcd->dev, "failed to set gamma table.\n");
460 /* update gamma table. */
461 ret = ld9040_panel_send_sequence(lcd, seq_gamma_ctrl);
463 dev_err(lcd->dev, "failed to update gamma table.\n");
469 static int ld9040_gamma_ctl(struct ld9040 *lcd, int gamma)
473 ret = _ld9040_gamma_ctl(lcd, gamma_table.gamma_22_table[gamma]);
479 static int ld9040_ldi_init(struct ld9040 *lcd)
482 static const unsigned short *init_seq[] = {
494 for (i = 0; i < ARRAY_SIZE(init_seq); i++) {
495 ret = ld9040_panel_send_sequence(lcd, init_seq[i]);
496 /* workaround: minimum delay time for transferring CMD */
505 static int ld9040_ldi_enable(struct ld9040 *lcd)
509 ret = ld9040_panel_send_sequence(lcd, seq_display_on);
514 static int ld9040_ldi_disable(struct ld9040 *lcd)
518 ret = ld9040_panel_send_sequence(lcd, seq_display_off);
519 ret = ld9040_panel_send_sequence(lcd, seq_sleep_in);
524 static int ld9040_power_on(struct ld9040 *lcd)
527 struct lcd_platform_data *pd = NULL;
530 dev_err(lcd->dev, "platform data is NULL.\n");
535 dev_err(lcd->dev, "power_on is NULL.\n");
538 pd->power_on(lcd->ld, 1);
539 mdelay(pd->power_on_delay);
543 dev_err(lcd->dev, "reset is NULL.\n");
547 mdelay(pd->reset_delay);
550 ret = ld9040_ldi_init(lcd);
552 dev_err(lcd->dev, "failed to initialize ldi.\n");
556 ret = ld9040_ldi_enable(lcd);
558 dev_err(lcd->dev, "failed to enable ldi.\n");
565 static int ld9040_power_off(struct ld9040 *lcd)
568 struct lcd_platform_data *pd = NULL;
572 dev_err(lcd->dev, "platform data is NULL.\n");
576 ret = ld9040_ldi_disable(lcd);
578 dev_err(lcd->dev, "lcd setting failed.\n");
582 mdelay(pd->power_off_delay);
585 dev_err(lcd->dev, "power_on is NULL.\n");
588 pd->power_on(lcd->ld, 0);
593 static int ld9040_power(struct ld9040 *lcd, int power)
597 if (power_is_on(power) && !power_is_on(lcd->power))
598 ret = ld9040_power_on(lcd);
599 else if (!power_is_on(power) && power_is_on(lcd->power))
600 ret = ld9040_power_off(lcd);
608 static int ld9040_set_power(struct lcd_device *ld, int power)
610 struct ld9040 *lcd = lcd_get_data(ld);
612 if (power != FB_BLANK_UNBLANK && power != FB_BLANK_POWERDOWN &&
613 power != FB_BLANK_NORMAL) {
614 dev_err(lcd->dev, "power value should be 0, 1 or 4.\n");
618 return ld9040_power(lcd, power);
621 static int ld9040_get_power(struct lcd_device *ld)
623 struct ld9040 *lcd = lcd_get_data(ld);
628 static int ld9040_get_brightness(struct backlight_device *bd)
630 return bd->props.brightness;
633 static int ld9040_set_brightness(struct backlight_device *bd)
635 int ret = 0, brightness = bd->props.brightness;
636 struct ld9040 *lcd = bl_get_data(bd);
638 if (brightness < MIN_BRIGHTNESS ||
639 brightness > bd->props.max_brightness) {
640 dev_err(&bd->dev, "lcd brightness should be %d to %d.\n",
641 MIN_BRIGHTNESS, MAX_BRIGHTNESS);
645 ret = ld9040_gamma_ctl(lcd, bd->props.brightness);
647 dev_err(&bd->dev, "lcd brightness setting failed.\n");
654 static struct lcd_ops ld9040_lcd_ops = {
655 .set_power = ld9040_set_power,
656 .get_power = ld9040_get_power,
659 static const struct backlight_ops ld9040_backlight_ops = {
660 .get_brightness = ld9040_get_brightness,
661 .update_status = ld9040_set_brightness,
665 static int ld9040_probe(struct spi_device *spi)
668 struct ld9040 *lcd = NULL;
669 struct lcd_device *ld = NULL;
670 struct backlight_device *bd = NULL;
672 lcd = kzalloc(sizeof(struct ld9040), GFP_KERNEL);
676 /* ld9040 lcd panel uses 3-wire 9bits SPI Mode. */
677 spi->bits_per_word = 9;
679 ret = spi_setup(spi);
681 dev_err(&spi->dev, "spi setup failed.\n");
686 lcd->dev = &spi->dev;
688 lcd->lcd_pd = spi->dev.platform_data;
690 dev_err(&spi->dev, "platform data is NULL.\n");
694 ld = lcd_device_register("ld9040", &spi->dev, lcd, &ld9040_lcd_ops);
702 bd = backlight_device_register("ld9040-bl", &spi->dev,
703 lcd, &ld9040_backlight_ops, NULL);
709 bd->props.max_brightness = MAX_BRIGHTNESS;
710 bd->props.brightness = MAX_BRIGHTNESS;
714 * if lcd panel was on from bootloader like u-boot then
717 if (!lcd->lcd_pd->lcd_enabled) {
719 * if lcd panel was off from bootloader then
720 * current lcd status is powerdown and then
721 * it enables lcd panel.
723 lcd->power = FB_BLANK_POWERDOWN;
725 ld9040_power(lcd, FB_BLANK_UNBLANK);
727 lcd->power = FB_BLANK_UNBLANK;
729 dev_set_drvdata(&spi->dev, lcd);
731 dev_info(&spi->dev, "ld9040 panel driver has been probed.\n");
739 static int __devexit ld9040_remove(struct spi_device *spi)
741 struct ld9040 *lcd = dev_get_drvdata(&spi->dev);
743 ld9040_power(lcd, FB_BLANK_POWERDOWN);
744 lcd_device_unregister(lcd->ld);
750 #if defined(CONFIG_PM)
751 static int ld9040_suspend(struct spi_device *spi, pm_message_t mesg)
754 struct ld9040 *lcd = dev_get_drvdata(&spi->dev);
756 dev_dbg(&spi->dev, "lcd->power = %d\n", lcd->power);
759 * when lcd panel is suspend, lcd panel becomes off
760 * regardless of status.
762 ret = ld9040_power(lcd, FB_BLANK_POWERDOWN);
767 static int ld9040_resume(struct spi_device *spi)
770 struct ld9040 *lcd = dev_get_drvdata(&spi->dev);
772 lcd->power = FB_BLANK_POWERDOWN;
774 ret = ld9040_power(lcd, FB_BLANK_UNBLANK);
779 #define ld9040_suspend NULL
780 #define ld9040_resume NULL
783 /* Power down all displays on reboot, poweroff or halt. */
784 static void ld9040_shutdown(struct spi_device *spi)
786 struct ld9040 *lcd = dev_get_drvdata(&spi->dev);
788 ld9040_power(lcd, FB_BLANK_POWERDOWN);
791 static struct spi_driver ld9040_driver = {
794 .bus = &spi_bus_type,
795 .owner = THIS_MODULE,
797 .probe = ld9040_probe,
798 .remove = __devexit_p(ld9040_remove),
799 .shutdown = ld9040_shutdown,
800 .suspend = ld9040_suspend,
801 .resume = ld9040_resume,
804 static int __init ld9040_init(void)
806 return spi_register_driver(&ld9040_driver);
809 static void __exit ld9040_exit(void)
811 spi_unregister_driver(&ld9040_driver);
814 module_init(ld9040_init);
815 module_exit(ld9040_exit);
817 MODULE_AUTHOR("Donghwa Lee <dh09.lee@samsung.com>");
818 MODULE_DESCRIPTION("ld9040 LCD Driver");
819 MODULE_LICENSE("GPL");