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>
33 #include <linux/module.h>
35 #include "ld9040_gamma.h"
37 #define SLEEPMSEC 0x1000
39 #define DEFMASK 0xFF00
40 #define COMMAND_ONLY 0xFE
41 #define DATA_ONLY 0xFF
43 #define MIN_BRIGHTNESS 0
44 #define MAX_BRIGHTNESS 24
45 #define power_is_on(pwr) ((pwr) <= FB_BLANK_NORMAL)
49 struct spi_device *spi;
51 unsigned int current_brightness;
53 struct lcd_device *ld;
54 struct backlight_device *bd;
55 struct lcd_platform_data *lcd_pd;
58 static const unsigned short seq_swreset[] = {
63 static const unsigned short seq_user_setting[] = {
70 static const unsigned short seq_elvss_on[] = {
78 static const unsigned short seq_gtcon[] = {
86 static const unsigned short seq_panel_condition[] = {
114 static const unsigned short seq_gamma_set1[] = {
140 static const unsigned short seq_gamma_ctrl[] = {
147 static const unsigned short seq_gamma_start[] = {
153 static const unsigned short seq_apon[] = {
163 static const unsigned short seq_display_ctrl[] = {
173 static const unsigned short seq_manual_pwr[] = {
178 static const unsigned short seq_pwr_ctrl[] = {
190 static const unsigned short seq_sleep_out[] = {
195 static const unsigned short seq_sleep_in[] = {
200 static const unsigned short seq_display_on[] = {
205 static const unsigned short seq_display_off[] = {
210 static const unsigned short seq_vci1_1st_en[] = {
220 static const unsigned short seq_vl1_en[] = {
230 static const unsigned short seq_vl2_en[] = {
240 static const unsigned short seq_vci1_2nd_en[] = {
250 static const unsigned short seq_vl3_en[] = {
260 static const unsigned short seq_vreg1_amp_en[] = {
270 static const unsigned short seq_vgh_amp_en[] = {
280 static const unsigned short seq_vgl_amp_en[] = {
290 static const unsigned short seq_vmos_amp_en[] = {
300 static const unsigned short seq_vint_amp_en[] = {
304 /* DATA_ONLY, 0x71, VMOS/VBL/VBH not used */
308 /* DATA_ONLY, 0x02, VMOS/VBL/VBH not used */
312 static const unsigned short seq_vbh_amp_en[] = {
322 static const unsigned short seq_vbl_amp_en[] = {
332 static const unsigned short seq_gam_amp_en[] = {
336 /* DATA_ONLY, 0x73, VMOS/VBL/VBH not used */
340 /* DATA_ONLY, 0x02, VMOS/VBL/VBH not used */
344 static const unsigned short seq_sd_amp_en[] = {
348 /* DATA_ONLY, 0x73, VMOS/VBL/VBH not used */
352 /* DATA_ONLY, 0x02, VMOS/VBL/VBH not used */
356 static const unsigned short seq_gls_en[] = {
360 /* DATA_ONLY, 0x73, VMOS/VBL/VBH not used */
364 /* DATA_ONLY, 0x02, VMOS/VBL/VBH not used */
368 static const unsigned short seq_els_en[] = {
372 /* DATA_ONLY, 0x73, VMOS/VBL/VBH not used */
376 /* DATA_ONLY, 0x02, VMOS/VBL/VBH not used */
380 static const unsigned short seq_el_on[] = {
384 /* DATA_ONLY, 0x73, VMOS/VBL/VBH not used */
388 /* DATA_ONLY, 0x02, VMOS/VBL/VBH not used */
392 static int ld9040_spi_write_byte(struct ld9040 *lcd, int addr, int data)
395 struct spi_message msg;
397 struct spi_transfer xfer = {
402 buf[0] = (addr << 8) | data;
404 spi_message_init(&msg);
405 spi_message_add_tail(&xfer, &msg);
407 return spi_sync(lcd->spi, &msg);
410 static int ld9040_spi_write(struct ld9040 *lcd, unsigned char address,
411 unsigned char command)
415 if (address != DATA_ONLY)
416 ret = ld9040_spi_write_byte(lcd, 0x0, address);
417 if (command != COMMAND_ONLY)
418 ret = ld9040_spi_write_byte(lcd, 0x1, command);
423 static int ld9040_panel_send_sequence(struct ld9040 *lcd,
424 const unsigned short *wbuf)
428 while ((wbuf[i] & DEFMASK) != ENDDEF) {
429 if ((wbuf[i] & DEFMASK) != SLEEPMSEC) {
430 ret = ld9040_spi_write(lcd, wbuf[i], wbuf[i+1]);
434 udelay(wbuf[i+1]*1000);
441 static int _ld9040_gamma_ctl(struct ld9040 *lcd, const unsigned int *gamma)
446 /* start gamma table updating. */
447 ret = ld9040_panel_send_sequence(lcd, seq_gamma_start);
449 dev_err(lcd->dev, "failed to disable gamma table updating.\n");
453 for (i = 0 ; i < GAMMA_TABLE_COUNT; i++) {
454 ret = ld9040_spi_write(lcd, DATA_ONLY, gamma[i]);
456 dev_err(lcd->dev, "failed to set gamma table.\n");
461 /* update gamma table. */
462 ret = ld9040_panel_send_sequence(lcd, seq_gamma_ctrl);
464 dev_err(lcd->dev, "failed to update gamma table.\n");
470 static int ld9040_gamma_ctl(struct ld9040 *lcd, int gamma)
474 ret = _ld9040_gamma_ctl(lcd, gamma_table.gamma_22_table[gamma]);
480 static int ld9040_ldi_init(struct ld9040 *lcd)
483 static const unsigned short *init_seq[] = {
495 for (i = 0; i < ARRAY_SIZE(init_seq); i++) {
496 ret = ld9040_panel_send_sequence(lcd, init_seq[i]);
497 /* workaround: minimum delay time for transferring CMD */
506 static int ld9040_ldi_enable(struct ld9040 *lcd)
510 ret = ld9040_panel_send_sequence(lcd, seq_display_on);
515 static int ld9040_ldi_disable(struct ld9040 *lcd)
519 ret = ld9040_panel_send_sequence(lcd, seq_display_off);
520 ret = ld9040_panel_send_sequence(lcd, seq_sleep_in);
525 static int ld9040_power_on(struct ld9040 *lcd)
528 struct lcd_platform_data *pd = NULL;
531 dev_err(lcd->dev, "platform data is NULL.\n");
536 dev_err(lcd->dev, "power_on is NULL.\n");
539 pd->power_on(lcd->ld, 1);
540 mdelay(pd->power_on_delay);
544 dev_err(lcd->dev, "reset is NULL.\n");
548 mdelay(pd->reset_delay);
551 ret = ld9040_ldi_init(lcd);
553 dev_err(lcd->dev, "failed to initialize ldi.\n");
557 ret = ld9040_ldi_enable(lcd);
559 dev_err(lcd->dev, "failed to enable ldi.\n");
566 static int ld9040_power_off(struct ld9040 *lcd)
569 struct lcd_platform_data *pd = NULL;
573 dev_err(lcd->dev, "platform data is NULL.\n");
577 ret = ld9040_ldi_disable(lcd);
579 dev_err(lcd->dev, "lcd setting failed.\n");
583 mdelay(pd->power_off_delay);
586 dev_err(lcd->dev, "power_on is NULL.\n");
589 pd->power_on(lcd->ld, 0);
594 static int ld9040_power(struct ld9040 *lcd, int power)
598 if (power_is_on(power) && !power_is_on(lcd->power))
599 ret = ld9040_power_on(lcd);
600 else if (!power_is_on(power) && power_is_on(lcd->power))
601 ret = ld9040_power_off(lcd);
609 static int ld9040_set_power(struct lcd_device *ld, int power)
611 struct ld9040 *lcd = lcd_get_data(ld);
613 if (power != FB_BLANK_UNBLANK && power != FB_BLANK_POWERDOWN &&
614 power != FB_BLANK_NORMAL) {
615 dev_err(lcd->dev, "power value should be 0, 1 or 4.\n");
619 return ld9040_power(lcd, power);
622 static int ld9040_get_power(struct lcd_device *ld)
624 struct ld9040 *lcd = lcd_get_data(ld);
629 static int ld9040_get_brightness(struct backlight_device *bd)
631 return bd->props.brightness;
634 static int ld9040_set_brightness(struct backlight_device *bd)
636 int ret = 0, brightness = bd->props.brightness;
637 struct ld9040 *lcd = bl_get_data(bd);
639 if (brightness < MIN_BRIGHTNESS ||
640 brightness > bd->props.max_brightness) {
641 dev_err(&bd->dev, "lcd brightness should be %d to %d.\n",
642 MIN_BRIGHTNESS, MAX_BRIGHTNESS);
646 ret = ld9040_gamma_ctl(lcd, bd->props.brightness);
648 dev_err(&bd->dev, "lcd brightness setting failed.\n");
655 static struct lcd_ops ld9040_lcd_ops = {
656 .set_power = ld9040_set_power,
657 .get_power = ld9040_get_power,
660 static const struct backlight_ops ld9040_backlight_ops = {
661 .get_brightness = ld9040_get_brightness,
662 .update_status = ld9040_set_brightness,
666 static int ld9040_probe(struct spi_device *spi)
669 struct ld9040 *lcd = NULL;
670 struct lcd_device *ld = NULL;
671 struct backlight_device *bd = NULL;
672 struct backlight_properties props;
674 lcd = kzalloc(sizeof(struct ld9040), GFP_KERNEL);
678 /* ld9040 lcd panel uses 3-wire 9bits SPI Mode. */
679 spi->bits_per_word = 9;
681 ret = spi_setup(spi);
683 dev_err(&spi->dev, "spi setup failed.\n");
688 lcd->dev = &spi->dev;
690 lcd->lcd_pd = spi->dev.platform_data;
692 dev_err(&spi->dev, "platform data is NULL.\n");
696 ld = lcd_device_register("ld9040", &spi->dev, lcd, &ld9040_lcd_ops);
704 memset(&props, 0, sizeof(struct backlight_properties));
705 props.type = BACKLIGHT_RAW;
706 props.max_brightness = MAX_BRIGHTNESS;
708 bd = backlight_device_register("ld9040-bl", &spi->dev,
709 lcd, &ld9040_backlight_ops, &props);
712 goto out_unregister_lcd;
715 bd->props.brightness = MAX_BRIGHTNESS;
719 * if lcd panel was on from bootloader like u-boot then
722 if (!lcd->lcd_pd->lcd_enabled) {
724 * if lcd panel was off from bootloader then
725 * current lcd status is powerdown and then
726 * it enables lcd panel.
728 lcd->power = FB_BLANK_POWERDOWN;
730 ld9040_power(lcd, FB_BLANK_UNBLANK);
732 lcd->power = FB_BLANK_UNBLANK;
734 dev_set_drvdata(&spi->dev, lcd);
736 dev_info(&spi->dev, "ld9040 panel driver has been probed.\n");
740 lcd_device_unregister(lcd->ld);
746 static int __devexit ld9040_remove(struct spi_device *spi)
748 struct ld9040 *lcd = dev_get_drvdata(&spi->dev);
750 ld9040_power(lcd, FB_BLANK_POWERDOWN);
751 backlight_device_unregister(lcd->bd);
752 lcd_device_unregister(lcd->ld);
758 #if defined(CONFIG_PM)
759 static int ld9040_suspend(struct spi_device *spi, pm_message_t mesg)
762 struct ld9040 *lcd = dev_get_drvdata(&spi->dev);
764 dev_dbg(&spi->dev, "lcd->power = %d\n", lcd->power);
767 * when lcd panel is suspend, lcd panel becomes off
768 * regardless of status.
770 ret = ld9040_power(lcd, FB_BLANK_POWERDOWN);
775 static int ld9040_resume(struct spi_device *spi)
778 struct ld9040 *lcd = dev_get_drvdata(&spi->dev);
780 lcd->power = FB_BLANK_POWERDOWN;
782 ret = ld9040_power(lcd, FB_BLANK_UNBLANK);
787 #define ld9040_suspend NULL
788 #define ld9040_resume NULL
791 /* Power down all displays on reboot, poweroff or halt. */
792 static void ld9040_shutdown(struct spi_device *spi)
794 struct ld9040 *lcd = dev_get_drvdata(&spi->dev);
796 ld9040_power(lcd, FB_BLANK_POWERDOWN);
799 static struct spi_driver ld9040_driver = {
802 .bus = &spi_bus_type,
803 .owner = THIS_MODULE,
805 .probe = ld9040_probe,
806 .remove = __devexit_p(ld9040_remove),
807 .shutdown = ld9040_shutdown,
808 .suspend = ld9040_suspend,
809 .resume = ld9040_resume,
812 static int __init ld9040_init(void)
814 return spi_register_driver(&ld9040_driver);
817 static void __exit ld9040_exit(void)
819 spi_unregister_driver(&ld9040_driver);
822 module_init(ld9040_init);
823 module_exit(ld9040_exit);
825 MODULE_AUTHOR("Donghwa Lee <dh09.lee@samsung.com>");
826 MODULE_DESCRIPTION("ld9040 LCD Driver");
827 MODULE_LICENSE("GPL");