2 * S6E63M0 AMOLED LCD panel driver.
4 * Author: InKi Dae <inki.dae@samsung.com>
6 * Derived from drivers/video/omap/lcd-apollon.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 "s6e63m0_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 10
45 #define POWER_IS_ON(pwr) ((pwr) <= FB_BLANK_NORMAL)
49 struct spi_device *spi;
51 unsigned int current_brightness;
52 unsigned int gamma_mode;
53 unsigned int gamma_table_count;
54 struct lcd_device *ld;
55 struct backlight_device *bd;
56 struct lcd_platform_data *lcd_pd;
59 static const unsigned short SEQ_PANEL_CONDITION_SET[] = {
78 static const unsigned short SEQ_DISPLAY_CONDITION_SET[] = {
92 static const unsigned short SEQ_GAMMA_SETTING[] = {
121 static const unsigned short SEQ_ETC_CONDITION_SET[] = {
320 static const unsigned short SEQ_ACL_ON[] = {
327 static const unsigned short SEQ_ACL_OFF[] = {
334 static const unsigned short SEQ_ELVSS_ON[] = {
341 static const unsigned short SEQ_ELVSS_OFF[] = {
348 static const unsigned short SEQ_STAND_BY_OFF[] = {
354 static const unsigned short SEQ_STAND_BY_ON[] = {
360 static const unsigned short SEQ_DISPLAY_ON[] = {
367 static int s6e63m0_spi_write_byte(struct s6e63m0 *lcd, int addr, int data)
370 struct spi_message msg;
372 struct spi_transfer xfer = {
377 buf[0] = (addr << 8) | data;
379 spi_message_init(&msg);
380 spi_message_add_tail(&xfer, &msg);
382 return spi_sync(lcd->spi, &msg);
385 static int s6e63m0_spi_write(struct s6e63m0 *lcd, unsigned char address,
386 unsigned char command)
390 if (address != DATA_ONLY)
391 ret = s6e63m0_spi_write_byte(lcd, 0x0, address);
392 if (command != COMMAND_ONLY)
393 ret = s6e63m0_spi_write_byte(lcd, 0x1, command);
398 static int s6e63m0_panel_send_sequence(struct s6e63m0 *lcd,
399 const unsigned short *wbuf)
403 while ((wbuf[i] & DEFMASK) != ENDDEF) {
404 if ((wbuf[i] & DEFMASK) != SLEEPMSEC) {
405 ret = s6e63m0_spi_write(lcd, wbuf[i], wbuf[i+1]);
409 udelay(wbuf[i+1]*1000);
416 static int _s6e63m0_gamma_ctl(struct s6e63m0 *lcd, const unsigned int *gamma)
421 /* disable gamma table updating. */
422 ret = s6e63m0_spi_write(lcd, 0xfa, 0x00);
424 dev_err(lcd->dev, "failed to disable gamma table updating.\n");
428 for (i = 0 ; i < GAMMA_TABLE_COUNT; i++) {
429 ret = s6e63m0_spi_write(lcd, DATA_ONLY, gamma[i]);
431 dev_err(lcd->dev, "failed to set gamma table.\n");
436 /* update gamma table. */
437 ret = s6e63m0_spi_write(lcd, 0xfa, 0x01);
439 dev_err(lcd->dev, "failed to update gamma table.\n");
445 static int s6e63m0_gamma_ctl(struct s6e63m0 *lcd, int gamma)
449 ret = _s6e63m0_gamma_ctl(lcd, gamma_table.gamma_22_table[gamma]);
455 static int s6e63m0_ldi_init(struct s6e63m0 *lcd)
458 const unsigned short *init_seq[] = {
459 SEQ_PANEL_CONDITION_SET,
460 SEQ_DISPLAY_CONDITION_SET,
462 SEQ_ETC_CONDITION_SET,
467 for (i = 0; i < ARRAY_SIZE(init_seq); i++) {
468 ret = s6e63m0_panel_send_sequence(lcd, init_seq[i]);
476 static int s6e63m0_ldi_enable(struct s6e63m0 *lcd)
479 const unsigned short *enable_seq[] = {
484 for (i = 0; i < ARRAY_SIZE(enable_seq); i++) {
485 ret = s6e63m0_panel_send_sequence(lcd, enable_seq[i]);
493 static int s6e63m0_ldi_disable(struct s6e63m0 *lcd)
497 ret = s6e63m0_panel_send_sequence(lcd, SEQ_STAND_BY_ON);
502 static int s6e63m0_power_on(struct s6e63m0 *lcd)
505 struct lcd_platform_data *pd = NULL;
506 struct backlight_device *bd = NULL;
510 dev_err(lcd->dev, "platform data is NULL.\n");
516 dev_err(lcd->dev, "backlight device is NULL.\n");
521 dev_err(lcd->dev, "power_on is NULL.\n");
524 pd->power_on(lcd->ld, 1);
525 mdelay(pd->power_on_delay);
529 dev_err(lcd->dev, "reset is NULL.\n");
533 mdelay(pd->reset_delay);
536 ret = s6e63m0_ldi_init(lcd);
538 dev_err(lcd->dev, "failed to initialize ldi.\n");
542 ret = s6e63m0_ldi_enable(lcd);
544 dev_err(lcd->dev, "failed to enable ldi.\n");
548 /* set brightness to current value after power on or resume. */
549 ret = s6e63m0_gamma_ctl(lcd, bd->props.brightness);
551 dev_err(lcd->dev, "lcd gamma setting failed.\n");
558 static int s6e63m0_power_off(struct s6e63m0 *lcd)
561 struct lcd_platform_data *pd = NULL;
565 dev_err(lcd->dev, "platform data is NULL.\n");
569 ret = s6e63m0_ldi_disable(lcd);
571 dev_err(lcd->dev, "lcd setting failed.\n");
575 mdelay(pd->power_off_delay);
578 dev_err(lcd->dev, "power_on is NULL.\n");
581 pd->power_on(lcd->ld, 0);
586 static int s6e63m0_power(struct s6e63m0 *lcd, int power)
590 if (POWER_IS_ON(power) && !POWER_IS_ON(lcd->power))
591 ret = s6e63m0_power_on(lcd);
592 else if (!POWER_IS_ON(power) && POWER_IS_ON(lcd->power))
593 ret = s6e63m0_power_off(lcd);
601 static int s6e63m0_set_power(struct lcd_device *ld, int power)
603 struct s6e63m0 *lcd = lcd_get_data(ld);
605 if (power != FB_BLANK_UNBLANK && power != FB_BLANK_POWERDOWN &&
606 power != FB_BLANK_NORMAL) {
607 dev_err(lcd->dev, "power value should be 0, 1 or 4.\n");
611 return s6e63m0_power(lcd, power);
614 static int s6e63m0_get_power(struct lcd_device *ld)
616 struct s6e63m0 *lcd = lcd_get_data(ld);
621 static int s6e63m0_get_brightness(struct backlight_device *bd)
623 return bd->props.brightness;
626 static int s6e63m0_set_brightness(struct backlight_device *bd)
628 int ret = 0, brightness = bd->props.brightness;
629 struct s6e63m0 *lcd = bl_get_data(bd);
631 if (brightness < MIN_BRIGHTNESS ||
632 brightness > bd->props.max_brightness) {
633 dev_err(&bd->dev, "lcd brightness should be %d to %d.\n",
634 MIN_BRIGHTNESS, MAX_BRIGHTNESS);
638 ret = s6e63m0_gamma_ctl(lcd, bd->props.brightness);
640 dev_err(&bd->dev, "lcd brightness setting failed.\n");
647 static struct lcd_ops s6e63m0_lcd_ops = {
648 .set_power = s6e63m0_set_power,
649 .get_power = s6e63m0_get_power,
652 static const struct backlight_ops s6e63m0_backlight_ops = {
653 .get_brightness = s6e63m0_get_brightness,
654 .update_status = s6e63m0_set_brightness,
657 static ssize_t s6e63m0_sysfs_show_gamma_mode(struct device *dev,
658 struct device_attribute *attr, char *buf)
660 struct s6e63m0 *lcd = dev_get_drvdata(dev);
663 switch (lcd->gamma_mode) {
665 sprintf(temp, "2.2 mode\n");
669 sprintf(temp, "1.9 mode\n");
673 sprintf(temp, "1.7 mode\n");
677 dev_info(dev, "gamma mode could be 0:2.2, 1:1.9 or 2:1.7)n");
684 static ssize_t s6e63m0_sysfs_store_gamma_mode(struct device *dev,
685 struct device_attribute *attr,
686 const char *buf, size_t len)
688 struct s6e63m0 *lcd = dev_get_drvdata(dev);
689 struct backlight_device *bd = NULL;
692 rc = strict_strtoul(buf, 0, (unsigned long *)&lcd->gamma_mode);
698 brightness = bd->props.brightness;
700 switch (lcd->gamma_mode) {
702 _s6e63m0_gamma_ctl(lcd, gamma_table.gamma_22_table[brightness]);
705 _s6e63m0_gamma_ctl(lcd, gamma_table.gamma_19_table[brightness]);
708 _s6e63m0_gamma_ctl(lcd, gamma_table.gamma_17_table[brightness]);
711 dev_info(dev, "gamma mode could be 0:2.2, 1:1.9 or 2:1.7\n");
712 _s6e63m0_gamma_ctl(lcd, gamma_table.gamma_22_table[brightness]);
718 static DEVICE_ATTR(gamma_mode, 0644,
719 s6e63m0_sysfs_show_gamma_mode, s6e63m0_sysfs_store_gamma_mode);
721 static ssize_t s6e63m0_sysfs_show_gamma_table(struct device *dev,
722 struct device_attribute *attr, char *buf)
724 struct s6e63m0 *lcd = dev_get_drvdata(dev);
727 sprintf(temp, "%d\n", lcd->gamma_table_count);
732 static DEVICE_ATTR(gamma_table, 0644,
733 s6e63m0_sysfs_show_gamma_table, NULL);
735 static int __init s6e63m0_probe(struct spi_device *spi)
738 struct s6e63m0 *lcd = NULL;
739 struct lcd_device *ld = NULL;
740 struct backlight_device *bd = NULL;
742 lcd = kzalloc(sizeof(struct s6e63m0), GFP_KERNEL);
746 /* s6e63m0 lcd panel uses 3-wire 9bits SPI Mode. */
747 spi->bits_per_word = 9;
749 ret = spi_setup(spi);
751 dev_err(&spi->dev, "spi setup failed.\n");
756 lcd->dev = &spi->dev;
758 lcd->lcd_pd = (struct lcd_platform_data *)spi->dev.platform_data;
760 dev_err(&spi->dev, "platform data is NULL.\n");
764 ld = lcd_device_register("s6e63m0", &spi->dev, lcd, &s6e63m0_lcd_ops);
772 bd = backlight_device_register("s6e63m0bl-bl", &spi->dev, lcd,
773 &s6e63m0_backlight_ops, NULL);
776 goto out_lcd_unregister;
779 bd->props.max_brightness = MAX_BRIGHTNESS;
780 bd->props.brightness = MAX_BRIGHTNESS;
784 * it gets gamma table count available so it gets user
787 lcd->gamma_table_count =
788 sizeof(gamma_table) / (MAX_GAMMA_LEVEL * sizeof(int));
790 ret = device_create_file(&(spi->dev), &dev_attr_gamma_mode);
792 dev_err(&(spi->dev), "failed to add sysfs entries\n");
794 ret = device_create_file(&(spi->dev), &dev_attr_gamma_table);
796 dev_err(&(spi->dev), "failed to add sysfs entries\n");
799 * if lcd panel was on from bootloader like u-boot then
802 if (!lcd->lcd_pd->lcd_enabled) {
804 * if lcd panel was off from bootloader then
805 * current lcd status is powerdown and then
806 * it enables lcd panel.
808 lcd->power = FB_BLANK_POWERDOWN;
810 s6e63m0_power(lcd, FB_BLANK_UNBLANK);
812 lcd->power = FB_BLANK_UNBLANK;
814 dev_set_drvdata(&spi->dev, lcd);
816 dev_info(&spi->dev, "s6e63m0 panel driver has been probed.\n");
821 lcd_device_unregister(ld);
827 static int __devexit s6e63m0_remove(struct spi_device *spi)
829 struct s6e63m0 *lcd = dev_get_drvdata(&spi->dev);
831 s6e63m0_power(lcd, FB_BLANK_POWERDOWN);
832 lcd_device_unregister(lcd->ld);
838 #if defined(CONFIG_PM)
839 unsigned int before_power;
841 static int s6e63m0_suspend(struct spi_device *spi, pm_message_t mesg)
844 struct s6e63m0 *lcd = dev_get_drvdata(&spi->dev);
846 dev_dbg(&spi->dev, "lcd->power = %d\n", lcd->power);
848 before_power = lcd->power;
851 * when lcd panel is suspend, lcd panel becomes off
852 * regardless of status.
854 ret = s6e63m0_power(lcd, FB_BLANK_POWERDOWN);
859 static int s6e63m0_resume(struct spi_device *spi)
862 struct s6e63m0 *lcd = dev_get_drvdata(&spi->dev);
865 * after suspended, if lcd panel status is FB_BLANK_UNBLANK
866 * (at that time, before_power is FB_BLANK_UNBLANK) then
867 * it changes that status to FB_BLANK_POWERDOWN to get lcd on.
869 if (before_power == FB_BLANK_UNBLANK)
870 lcd->power = FB_BLANK_POWERDOWN;
872 dev_dbg(&spi->dev, "before_power = %d\n", before_power);
874 ret = s6e63m0_power(lcd, before_power);
879 #define s6e63m0_suspend NULL
880 #define s6e63m0_resume NULL
883 /* Power down all displays on reboot, poweroff or halt. */
884 static void s6e63m0_shutdown(struct spi_device *spi)
886 struct s6e63m0 *lcd = dev_get_drvdata(&spi->dev);
888 s6e63m0_power(lcd, FB_BLANK_POWERDOWN);
891 static struct spi_driver s6e63m0_driver = {
894 .bus = &spi_bus_type,
895 .owner = THIS_MODULE,
897 .probe = s6e63m0_probe,
898 .remove = __devexit_p(s6e63m0_remove),
899 .shutdown = s6e63m0_shutdown,
900 .suspend = s6e63m0_suspend,
901 .resume = s6e63m0_resume,
904 static int __init s6e63m0_init(void)
906 return spi_register_driver(&s6e63m0_driver);
909 static void __exit s6e63m0_exit(void)
911 spi_unregister_driver(&s6e63m0_driver);
914 module_init(s6e63m0_init);
915 module_exit(s6e63m0_exit);
917 MODULE_AUTHOR("InKi Dae <inki.dae@samsung.com>");
918 MODULE_DESCRIPTION("S6E63M0 LCD Driver");
919 MODULE_LICENSE("GPL");