[mirror_ubuntu-artful-kernel.git] / drivers / video / backlight / s6e63m0.c

/*
 * S6E63M0 AMOLED LCD panel driver.
 *
 * Author: InKi Dae  <inki.dae@samsung.com>
 *
 * Derived from drivers/video/omap/lcd-apollon.c
 *
 * This program is free software; you can redistribute it and/or modify it
 * under the terms of the GNU General Public License as published by the
 * Free Software Foundation; either version 2 of the License, or (at your
 * option) any later version.
 */

#include <linux/backlight.h>
#include <linux/delay.h>
#include <linux/fb.h>
#include <linux/gpio.h>
#include <linux/interrupt.h>
#include <linux/irq.h>
#include <linux/kernel.h>
#include <linux/lcd.h>
#include <linux/module.h>
#include <linux/spi/spi.h>
#include <linux/wait.h>

#include "s6e63m0_gamma.h"

#define SLEEPMSEC		0x1000
#define ENDDEF			0x2000
#define	DEFMASK			0xFF00
#define COMMAND_ONLY		0xFE
#define DATA_ONLY		0xFF

#define MIN_BRIGHTNESS		0
#define MAX_BRIGHTNESS		10

struct s6e63m0 {
	struct device			*dev;
	struct spi_device		*spi;
	unsigned int			power;
	unsigned int			current_brightness;
	unsigned int			gamma_mode;
	unsigned int			gamma_table_count;
	struct lcd_device		*ld;
	struct backlight_device		*bd;
	struct lcd_platform_data	*lcd_pd;
};

static const unsigned short seq_panel_condition_set[] = {
	0xF8, 0x01,
	DATA_ONLY, 0x27,
	DATA_ONLY, 0x27,
	DATA_ONLY, 0x07,
	DATA_ONLY, 0x07,
	DATA_ONLY, 0x54,
	DATA_ONLY, 0x9f,
	DATA_ONLY, 0x63,
	DATA_ONLY, 0x86,
	DATA_ONLY, 0x1a,
	DATA_ONLY, 0x33,
	DATA_ONLY, 0x0d,
	DATA_ONLY, 0x00,
	DATA_ONLY, 0x00,

	ENDDEF, 0x0000
};

static const unsigned short seq_display_condition_set[] = {
	0xf2, 0x02,
	DATA_ONLY, 0x03,
	DATA_ONLY, 0x1c,
	DATA_ONLY, 0x10,
	DATA_ONLY, 0x10,

	0xf7, 0x03,
	DATA_ONLY, 0x00,
	DATA_ONLY, 0x00,

	ENDDEF, 0x0000
};

static const unsigned short seq_gamma_setting[] = {
	0xfa, 0x00,
	DATA_ONLY, 0x18,
	DATA_ONLY, 0x08,
	DATA_ONLY, 0x24,
	DATA_ONLY, 0x64,
	DATA_ONLY, 0x56,
	DATA_ONLY, 0x33,
	DATA_ONLY, 0xb6,
	DATA_ONLY, 0xba,
	DATA_ONLY, 0xa8,
	DATA_ONLY, 0xac,
	DATA_ONLY, 0xb1,
	DATA_ONLY, 0x9d,
	DATA_ONLY, 0xc1,
	DATA_ONLY, 0xc1,
	DATA_ONLY, 0xb7,
	DATA_ONLY, 0x00,
	DATA_ONLY, 0x9c,
	DATA_ONLY, 0x00,
	DATA_ONLY, 0x9f,
	DATA_ONLY, 0x00,
	DATA_ONLY, 0xd6,

	0xfa, 0x01,

	ENDDEF, 0x0000
};

static const unsigned short seq_etc_condition_set[] = {
	0xf6, 0x00,
	DATA_ONLY, 0x8c,
	DATA_ONLY, 0x07,

	0xb3, 0xc,

	0xb5, 0x2c,
	DATA_ONLY, 0x12,
	DATA_ONLY, 0x0c,
	DATA_ONLY, 0x0a,
	DATA_ONLY, 0x10,
	DATA_ONLY, 0x0e,
	DATA_ONLY, 0x17,
	DATA_ONLY, 0x13,
	DATA_ONLY, 0x1f,
	DATA_ONLY, 0x1a,
	DATA_ONLY, 0x2a,
	DATA_ONLY, 0x24,
	DATA_ONLY, 0x1f,
	DATA_ONLY, 0x1b,
	DATA_ONLY, 0x1a,
	DATA_ONLY, 0x17,

	DATA_ONLY, 0x2b,
	DATA_ONLY, 0x26,
	DATA_ONLY, 0x22,
	DATA_ONLY, 0x20,
	DATA_ONLY, 0x3a,
	DATA_ONLY, 0x34,
	DATA_ONLY, 0x30,
	DATA_ONLY, 0x2c,
	DATA_ONLY, 0x29,
	DATA_ONLY, 0x26,
	DATA_ONLY, 0x25,
	DATA_ONLY, 0x23,
	DATA_ONLY, 0x21,
	DATA_ONLY, 0x20,
	DATA_ONLY, 0x1e,
	DATA_ONLY, 0x1e,

	0xb6, 0x00,
	DATA_ONLY, 0x00,
	DATA_ONLY, 0x11,
	DATA_ONLY, 0x22,
	DATA_ONLY, 0x33,
	DATA_ONLY, 0x44,
	DATA_ONLY, 0x44,
	DATA_ONLY, 0x44,

	DATA_ONLY, 0x55,
	DATA_ONLY, 0x55,
	DATA_ONLY, 0x66,
	DATA_ONLY, 0x66,
	DATA_ONLY, 0x66,
	DATA_ONLY, 0x66,
	DATA_ONLY, 0x66,
	DATA_ONLY, 0x66,

	0xb7, 0x2c,
	DATA_ONLY, 0x12,
	DATA_ONLY, 0x0c,
	DATA_ONLY, 0x0a,
	DATA_ONLY, 0x10,
	DATA_ONLY, 0x0e,
	DATA_ONLY, 0x17,
	DATA_ONLY, 0x13,
	DATA_ONLY, 0x1f,
	DATA_ONLY, 0x1a,
	DATA_ONLY, 0x2a,
	DATA_ONLY, 0x24,
	DATA_ONLY, 0x1f,
	DATA_ONLY, 0x1b,
	DATA_ONLY, 0x1a,
	DATA_ONLY, 0x17,

	DATA_ONLY, 0x2b,
	DATA_ONLY, 0x26,
	DATA_ONLY, 0x22,
	DATA_ONLY, 0x20,
	DATA_ONLY, 0x3a,
	DATA_ONLY, 0x34,
	DATA_ONLY, 0x30,
	DATA_ONLY, 0x2c,
	DATA_ONLY, 0x29,
	DATA_ONLY, 0x26,
	DATA_ONLY, 0x25,
	DATA_ONLY, 0x23,
	DATA_ONLY, 0x21,
	DATA_ONLY, 0x20,
	DATA_ONLY, 0x1e,
	DATA_ONLY, 0x1e,

	0xb8, 0x00,
	DATA_ONLY, 0x00,
	DATA_ONLY, 0x11,
	DATA_ONLY, 0x22,
	DATA_ONLY, 0x33,
	DATA_ONLY, 0x44,
	DATA_ONLY, 0x44,
	DATA_ONLY, 0x44,

	DATA_ONLY, 0x55,
	DATA_ONLY, 0x55,
	DATA_ONLY, 0x66,
	DATA_ONLY, 0x66,
	DATA_ONLY, 0x66,
	DATA_ONLY, 0x66,
	DATA_ONLY, 0x66,
	DATA_ONLY, 0x66,

	0xb9, 0x2c,
	DATA_ONLY, 0x12,
	DATA_ONLY, 0x0c,
	DATA_ONLY, 0x0a,
	DATA_ONLY, 0x10,
	DATA_ONLY, 0x0e,
	DATA_ONLY, 0x17,
	DATA_ONLY, 0x13,
	DATA_ONLY, 0x1f,
	DATA_ONLY, 0x1a,
	DATA_ONLY, 0x2a,
	DATA_ONLY, 0x24,
	DATA_ONLY, 0x1f,
	DATA_ONLY, 0x1b,
	DATA_ONLY, 0x1a,
	DATA_ONLY, 0x17,

	DATA_ONLY, 0x2b,
	DATA_ONLY, 0x26,
	DATA_ONLY, 0x22,
	DATA_ONLY, 0x20,
	DATA_ONLY, 0x3a,
	DATA_ONLY, 0x34,
	DATA_ONLY, 0x30,
	DATA_ONLY, 0x2c,
	DATA_ONLY, 0x29,
	DATA_ONLY, 0x26,
	DATA_ONLY, 0x25,
	DATA_ONLY, 0x23,
	DATA_ONLY, 0x21,
	DATA_ONLY, 0x20,
	DATA_ONLY, 0x1e,
	DATA_ONLY, 0x1e,

	0xba, 0x00,
	DATA_ONLY, 0x00,
	DATA_ONLY, 0x11,
	DATA_ONLY, 0x22,
	DATA_ONLY, 0x33,
	DATA_ONLY, 0x44,
	DATA_ONLY, 0x44,
	DATA_ONLY, 0x44,

	DATA_ONLY, 0x55,
	DATA_ONLY, 0x55,
	DATA_ONLY, 0x66,
	DATA_ONLY, 0x66,
	DATA_ONLY, 0x66,
	DATA_ONLY, 0x66,
	DATA_ONLY, 0x66,
	DATA_ONLY, 0x66,

	0xc1, 0x4d,
	DATA_ONLY, 0x96,
	DATA_ONLY, 0x1d,
	DATA_ONLY, 0x00,
	DATA_ONLY, 0x00,
	DATA_ONLY, 0x01,
	DATA_ONLY, 0xdf,
	DATA_ONLY, 0x00,
	DATA_ONLY, 0x00,
	DATA_ONLY, 0x03,
	DATA_ONLY, 0x1f,
	DATA_ONLY, 0x00,
	DATA_ONLY, 0x00,
	DATA_ONLY, 0x00,
	DATA_ONLY, 0x00,
	DATA_ONLY, 0x00,
	DATA_ONLY, 0x00,
	DATA_ONLY, 0x00,
	DATA_ONLY, 0x00,
	DATA_ONLY, 0x03,
	DATA_ONLY, 0x06,
	DATA_ONLY, 0x09,
	DATA_ONLY, 0x0d,
	DATA_ONLY, 0x0f,
	DATA_ONLY, 0x12,
	DATA_ONLY, 0x15,
	DATA_ONLY, 0x18,

	0xb2, 0x10,
	DATA_ONLY, 0x10,
	DATA_ONLY, 0x0b,
	DATA_ONLY, 0x05,

	ENDDEF, 0x0000
};

static const unsigned short seq_acl_on[] = {
	/* ACL on */
	0xc0, 0x01,

	ENDDEF, 0x0000
};

static const unsigned short seq_acl_off[] = {
	/* ACL off */
	0xc0, 0x00,

	ENDDEF, 0x0000
};

static const unsigned short seq_elvss_on[] = {
	/* ELVSS on */
	0xb1, 0x0b,

	ENDDEF, 0x0000
};

static const unsigned short seq_elvss_off[] = {
	/* ELVSS off */
	0xb1, 0x0a,

	ENDDEF, 0x0000
};

static const unsigned short seq_stand_by_off[] = {
	0x11, COMMAND_ONLY,

	ENDDEF, 0x0000
};

static const unsigned short seq_stand_by_on[] = {
	0x10, COMMAND_ONLY,

	ENDDEF, 0x0000
};

static const unsigned short seq_display_on[] = {
	0x29, COMMAND_ONLY,

	ENDDEF, 0x0000
};


static int s6e63m0_spi_write_byte(struct s6e63m0 *lcd, int addr, int data)
{
	u16 buf[1];
	struct spi_message msg;

	struct spi_transfer xfer = {
		.len		= 2,
		.tx_buf		= buf,
	};

	buf[0] = (addr << 8) | data;

	spi_message_init(&msg);
	spi_message_add_tail(&xfer, &msg);

	return spi_sync(lcd->spi, &msg);
}

static int s6e63m0_spi_write(struct s6e63m0 *lcd, unsigned char address,
	unsigned char command)
{
	int ret = 0;

	if (address != DATA_ONLY)
		ret = s6e63m0_spi_write_byte(lcd, 0x0, address);
	if (command != COMMAND_ONLY)
		ret = s6e63m0_spi_write_byte(lcd, 0x1, command);

	return ret;
}

static int s6e63m0_panel_send_sequence(struct s6e63m0 *lcd,
	const unsigned short *wbuf)
{
	int ret = 0, i = 0;

	while ((wbuf[i] & DEFMASK) != ENDDEF) {
		if ((wbuf[i] & DEFMASK) != SLEEPMSEC) {
			ret = s6e63m0_spi_write(lcd, wbuf[i], wbuf[i+1]);
			if (ret)
				break;
		} else {
			msleep(wbuf[i+1]);
		}
		i += 2;
	}

	return ret;
}

static int _s6e63m0_gamma_ctl(struct s6e63m0 *lcd, const unsigned int *gamma)
{
	unsigned int i = 0;
	int ret = 0;

	/* disable gamma table updating. */
	ret = s6e63m0_spi_write(lcd, 0xfa, 0x00);
	if (ret) {
		dev_err(lcd->dev, "failed to disable gamma table updating.\n");
		goto gamma_err;
	}

	for (i = 0 ; i < GAMMA_TABLE_COUNT; i++) {
		ret = s6e63m0_spi_write(lcd, DATA_ONLY, gamma[i]);
		if (ret) {
			dev_err(lcd->dev, "failed to set gamma table.\n");
			goto gamma_err;
		}
	}

	/* update gamma table. */
	ret = s6e63m0_spi_write(lcd, 0xfa, 0x01);
	if (ret)
		dev_err(lcd->dev, "failed to update gamma table.\n");

gamma_err:
	return ret;
}

static int s6e63m0_gamma_ctl(struct s6e63m0 *lcd, int gamma)
{
	int ret = 0;

	ret = _s6e63m0_gamma_ctl(lcd, gamma_table.gamma_22_table[gamma]);

	return ret;
}


static int s6e63m0_ldi_init(struct s6e63m0 *lcd)
{
	int ret, i;
	const unsigned short *init_seq[] = {
		seq_panel_condition_set,
		seq_display_condition_set,
		seq_gamma_setting,
		seq_etc_condition_set,
		seq_acl_on,
		seq_elvss_on,
	};

	for (i = 0; i < ARRAY_SIZE(init_seq); i++) {
		ret = s6e63m0_panel_send_sequence(lcd, init_seq[i]);
		if (ret)
			break;
	}

	return ret;
}

static int s6e63m0_ldi_enable(struct s6e63m0 *lcd)
{
	int ret = 0, i;
	const unsigned short *enable_seq[] = {
		seq_stand_by_off,
		seq_display_on,
	};

	for (i = 0; i < ARRAY_SIZE(enable_seq); i++) {
		ret = s6e63m0_panel_send_sequence(lcd, enable_seq[i]);
		if (ret)
			break;
	}

	return ret;
}

static int s6e63m0_ldi_disable(struct s6e63m0 *lcd)
{
	int ret;

	ret = s6e63m0_panel_send_sequence(lcd, seq_stand_by_on);

	return ret;
}

static int s6e63m0_power_is_on(int power)
{
	return power <= FB_BLANK_NORMAL;
}

static int s6e63m0_power_on(struct s6e63m0 *lcd)
{
	int ret = 0;
	struct lcd_platform_data *pd;
	struct backlight_device *bd;

	pd = lcd->lcd_pd;
	bd = lcd->bd;

	if (!pd->power_on) {
		dev_err(lcd->dev, "power_on is NULL.\n");
		return -EINVAL;
	}

	pd->power_on(lcd->ld, 1);
	msleep(pd->power_on_delay);

	if (!pd->reset) {
		dev_err(lcd->dev, "reset is NULL.\n");
		return -EINVAL;
	}

	pd->reset(lcd->ld);
	msleep(pd->reset_delay);

	ret = s6e63m0_ldi_init(lcd);
	if (ret) {
		dev_err(lcd->dev, "failed to initialize ldi.\n");
		return ret;
	}

	ret = s6e63m0_ldi_enable(lcd);
	if (ret) {
		dev_err(lcd->dev, "failed to enable ldi.\n");
		return ret;
	}

	/* set brightness to current value after power on or resume. */
	ret = s6e63m0_gamma_ctl(lcd, bd->props.brightness);
	if (ret) {
		dev_err(lcd->dev, "lcd gamma setting failed.\n");
		return ret;
	}

	return 0;
}

static int s6e63m0_power_off(struct s6e63m0 *lcd)
{
	int ret;
	struct lcd_platform_data *pd;

	pd = lcd->lcd_pd;

	ret = s6e63m0_ldi_disable(lcd);
	if (ret) {
		dev_err(lcd->dev, "lcd setting failed.\n");
		return -EIO;
	}

	msleep(pd->power_off_delay);

	pd->power_on(lcd->ld, 0);

	return 0;
}

static int s6e63m0_power(struct s6e63m0 *lcd, int power)
{
	int ret = 0;

	if (s6e63m0_power_is_on(power) && !s6e63m0_power_is_on(lcd->power))
		ret = s6e63m0_power_on(lcd);
	else if (!s6e63m0_power_is_on(power) && s6e63m0_power_is_on(lcd->power))
		ret = s6e63m0_power_off(lcd);

	if (!ret)
		lcd->power = power;

	return ret;
}

static int s6e63m0_set_power(struct lcd_device *ld, int power)
{
	struct s6e63m0 *lcd = lcd_get_data(ld);

	if (power != FB_BLANK_UNBLANK && power != FB_BLANK_POWERDOWN &&
		power != FB_BLANK_NORMAL) {
		dev_err(lcd->dev, "power value should be 0, 1 or 4.\n");
		return -EINVAL;
	}

	return s6e63m0_power(lcd, power);
}

static int s6e63m0_get_power(struct lcd_device *ld)
{
	struct s6e63m0 *lcd = lcd_get_data(ld);

	return lcd->power;
}

static int s6e63m0_set_brightness(struct backlight_device *bd)
{
	int ret = 0, brightness = bd->props.brightness;
	struct s6e63m0 *lcd = bl_get_data(bd);

	if (brightness < MIN_BRIGHTNESS ||
		brightness > bd->props.max_brightness) {
		dev_err(&bd->dev, "lcd brightness should be %d to %d.\n",
			MIN_BRIGHTNESS, MAX_BRIGHTNESS);
		return -EINVAL;
	}

	ret = s6e63m0_gamma_ctl(lcd, bd->props.brightness);
	if (ret) {
		dev_err(&bd->dev, "lcd brightness setting failed.\n");
		return -EIO;
	}

	return ret;
}

static struct lcd_ops s6e63m0_lcd_ops = {
	.set_power = s6e63m0_set_power,
	.get_power = s6e63m0_get_power,
};

static const struct backlight_ops s6e63m0_backlight_ops  = {
	.update_status = s6e63m0_set_brightness,
};

static ssize_t s6e63m0_sysfs_show_gamma_mode(struct device *dev,
				      struct device_attribute *attr, char *buf)
{
	struct s6e63m0 *lcd = dev_get_drvdata(dev);
	char temp[10];

	switch (lcd->gamma_mode) {
	case 0:
		sprintf(temp, "2.2 mode\n");
		strcat(buf, temp);
		break;
	case 1:
		sprintf(temp, "1.9 mode\n");
		strcat(buf, temp);
		break;
	case 2:
		sprintf(temp, "1.7 mode\n");
		strcat(buf, temp);
		break;
	default:
		dev_info(dev, "gamma mode could be 0:2.2, 1:1.9 or 2:1.7)n");
		break;
	}

	return strlen(buf);
}

static ssize_t s6e63m0_sysfs_store_gamma_mode(struct device *dev,
				       struct device_attribute *attr,
				       const char *buf, size_t len)
{
	struct s6e63m0 *lcd = dev_get_drvdata(dev);
	struct backlight_device *bd = NULL;
	int brightness, rc;

	rc = kstrtouint(buf, 0, &lcd->gamma_mode);
	if (rc < 0)
		return rc;

	bd = lcd->bd;

	brightness = bd->props.brightness;

	switch (lcd->gamma_mode) {
	case 0:
		_s6e63m0_gamma_ctl(lcd, gamma_table.gamma_22_table[brightness]);
		break;
	case 1:
		_s6e63m0_gamma_ctl(lcd, gamma_table.gamma_19_table[brightness]);
		break;
	case 2:
		_s6e63m0_gamma_ctl(lcd, gamma_table.gamma_17_table[brightness]);
		break;
	default:
		dev_info(dev, "gamma mode could be 0:2.2, 1:1.9 or 2:1.7\n");
		_s6e63m0_gamma_ctl(lcd, gamma_table.gamma_22_table[brightness]);
		break;
	}
	return len;
}

static DEVICE_ATTR(gamma_mode, 0644,
		s6e63m0_sysfs_show_gamma_mode, s6e63m0_sysfs_store_gamma_mode);

static ssize_t s6e63m0_sysfs_show_gamma_table(struct device *dev,
				      struct device_attribute *attr, char *buf)
{
	struct s6e63m0 *lcd = dev_get_drvdata(dev);
	char temp[3];

	sprintf(temp, "%u\n", lcd->gamma_table_count);
	strcpy(buf, temp);

	return strlen(buf);
}
static DEVICE_ATTR(gamma_table, 0444,
		s6e63m0_sysfs_show_gamma_table, NULL);

static int s6e63m0_probe(struct spi_device *spi)
{
	int ret = 0;
	struct s6e63m0 *lcd = NULL;
	struct lcd_device *ld = NULL;
	struct backlight_device *bd = NULL;
	struct backlight_properties props;

	lcd = devm_kzalloc(&spi->dev, sizeof(struct s6e63m0), GFP_KERNEL);
	if (!lcd)
		return -ENOMEM;

	/* s6e63m0 lcd panel uses 3-wire 9bits SPI Mode. */
	spi->bits_per_word = 9;

	ret = spi_setup(spi);
	if (ret < 0) {
		dev_err(&spi->dev, "spi setup failed.\n");
		return ret;
	}

	lcd->spi = spi;
	lcd->dev = &spi->dev;

	lcd->lcd_pd = dev_get_platdata(&spi->dev);
	if (!lcd->lcd_pd) {
		dev_err(&spi->dev, "platform data is NULL.\n");
		return -EINVAL;
	}

	ld = devm_lcd_device_register(&spi->dev, "s6e63m0", &spi->dev, lcd,
				&s6e63m0_lcd_ops);
	if (IS_ERR(ld))
		return PTR_ERR(ld);

	lcd->ld = ld;

	memset(&props, 0, sizeof(struct backlight_properties));
	props.type = BACKLIGHT_RAW;
	props.max_brightness = MAX_BRIGHTNESS;

	bd = devm_backlight_device_register(&spi->dev, "s6e63m0bl-bl",
					&spi->dev, lcd, &s6e63m0_backlight_ops,
					&props);
	if (IS_ERR(bd))
		return PTR_ERR(bd);

	bd->props.brightness = MAX_BRIGHTNESS;
	lcd->bd = bd;

	/*
	 * it gets gamma table count available so it gets user
	 * know that.
	 */
	lcd->gamma_table_count =
	    sizeof(gamma_table) / (MAX_GAMMA_LEVEL * sizeof(int *));

	ret = device_create_file(&(spi->dev), &dev_attr_gamma_mode);
	if (ret < 0)
		dev_err(&(spi->dev), "failed to add sysfs entries\n");

	ret = device_create_file(&(spi->dev), &dev_attr_gamma_table);
	if (ret < 0)
		dev_err(&(spi->dev), "failed to add sysfs entries\n");

	/*
	 * if lcd panel was on from bootloader like u-boot then
	 * do not lcd on.
	 */
	if (!lcd->lcd_pd->lcd_enabled) {
		/*
		 * if lcd panel was off from bootloader then
		 * current lcd status is powerdown and then
		 * it enables lcd panel.
		 */
		lcd->power = FB_BLANK_POWERDOWN;

		s6e63m0_power(lcd, FB_BLANK_UNBLANK);
	} else {
		lcd->power = FB_BLANK_UNBLANK;
	}

	spi_set_drvdata(spi, lcd);

	dev_info(&spi->dev, "s6e63m0 panel driver has been probed.\n");

	return 0;
}

static int s6e63m0_remove(struct spi_device *spi)
{
	struct s6e63m0 *lcd = spi_get_drvdata(spi);

	s6e63m0_power(lcd, FB_BLANK_POWERDOWN);
	device_remove_file(&spi->dev, &dev_attr_gamma_table);
	device_remove_file(&spi->dev, &dev_attr_gamma_mode);

	return 0;
}

#ifdef CONFIG_PM_SLEEP
static int s6e63m0_suspend(struct device *dev)
{
	struct s6e63m0 *lcd = dev_get_drvdata(dev);

	dev_dbg(dev, "lcd->power = %d\n", lcd->power);

	/*
	 * when lcd panel is suspend, lcd panel becomes off
	 * regardless of status.
	 */
	return s6e63m0_power(lcd, FB_BLANK_POWERDOWN);
}

static int s6e63m0_resume(struct device *dev)
{
	struct s6e63m0 *lcd = dev_get_drvdata(dev);

	lcd->power = FB_BLANK_POWERDOWN;

	return s6e63m0_power(lcd, FB_BLANK_UNBLANK);
}
#endif

static SIMPLE_DEV_PM_OPS(s6e63m0_pm_ops, s6e63m0_suspend, s6e63m0_resume);

/* Power down all displays on reboot, poweroff or halt. */
static void s6e63m0_shutdown(struct spi_device *spi)
{
	struct s6e63m0 *lcd = spi_get_drvdata(spi);

	s6e63m0_power(lcd, FB_BLANK_POWERDOWN);
}

static struct spi_driver s6e63m0_driver = {
	.driver = {
		.name	= "s6e63m0",
		.pm	= &s6e63m0_pm_ops,
	},
	.probe		= s6e63m0_probe,
	.remove		= s6e63m0_remove,
	.shutdown	= s6e63m0_shutdown,
};

module_spi_driver(s6e63m0_driver);

MODULE_AUTHOR("InKi Dae <inki.dae@samsung.com>");
MODULE_DESCRIPTION("S6E63M0 LCD Driver");
MODULE_LICENSE("GPL");
Commit	Line	Data
ee378a5c ID	1	/*
	2	* S6E63M0 AMOLED LCD panel driver.
	3	*
	4	* Author: InKi Dae <inki.dae@samsung.com>
	5	*
	6	* Derived from drivers/video/omap/lcd-apollon.c
	7	*
	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.
ee378a5c ID	12	*/
ee378a5c ID	13
f5cede7c	14	#include <linux/backlight.h>
ee378a5c	15	#include <linux/delay.h>
f5cede7c	16	#include <linux/fb.h>
ee378a5c	17	#include <linux/gpio.h>
ee378a5c	18	#include <linux/interrupt.h>
f5cede7c	19	#include <linux/irq.h>
ee378a5c ID	20	#include <linux/kernel.h>
ee378a5c ID	21	#include <linux/lcd.h>
355b200b	22	#include <linux/module.h>
f5cede7c JH	23	#include <linux/spi/spi.h>
f5cede7c JH	24	#include <linux/wait.h>
ee378a5c ID	25
	26	#include "s6e63m0_gamma.h"
	27
	28	#define SLEEPMSEC 0x1000
	29	#define ENDDEF 0x2000
	30	#define DEFMASK 0xFF00
	31	#define COMMAND_ONLY 0xFE
	32	#define DATA_ONLY 0xFF
	33
	34	#define MIN_BRIGHTNESS 0
	35	#define MAX_BRIGHTNESS 10
	36
ee378a5c ID	37	struct s6e63m0 {
	38	struct device *dev;
	39	struct spi_device *spi;
	40	unsigned int power;
	41	unsigned int current_brightness;
	42	unsigned int gamma_mode;
	43	unsigned int gamma_table_count;
	44	struct lcd_device *ld;
	45	struct backlight_device *bd;
	46	struct lcd_platform_data *lcd_pd;
	47	};
	48
4a959e59	49	static const unsigned short seq_panel_condition_set[] = {
ee378a5c ID	50	0xF8, 0x01,
	51	DATA_ONLY, 0x27,
	52	DATA_ONLY, 0x27,
	53	DATA_ONLY, 0x07,
	54	DATA_ONLY, 0x07,
	55	DATA_ONLY, 0x54,
	56	DATA_ONLY, 0x9f,
	57	DATA_ONLY, 0x63,
	58	DATA_ONLY, 0x86,
	59	DATA_ONLY, 0x1a,
	60	DATA_ONLY, 0x33,
	61	DATA_ONLY, 0x0d,
	62	DATA_ONLY, 0x00,
	63	DATA_ONLY, 0x00,
	64
	65	ENDDEF, 0x0000
	66	};
	67
4a959e59	68	static const unsigned short seq_display_condition_set[] = {
ee378a5c ID	69	0xf2, 0x02,
	70	DATA_ONLY, 0x03,
	71	DATA_ONLY, 0x1c,
	72	DATA_ONLY, 0x10,
	73	DATA_ONLY, 0x10,
	74
	75	0xf7, 0x03,
	76	DATA_ONLY, 0x00,
	77	DATA_ONLY, 0x00,
	78
	79	ENDDEF, 0x0000
	80	};
	81
4a959e59	82	static const unsigned short seq_gamma_setting[] = {
ee378a5c ID	83	0xfa, 0x00,
	84	DATA_ONLY, 0x18,
	85	DATA_ONLY, 0x08,
	86	DATA_ONLY, 0x24,
	87	DATA_ONLY, 0x64,
	88	DATA_ONLY, 0x56,
	89	DATA_ONLY, 0x33,
	90	DATA_ONLY, 0xb6,
	91	DATA_ONLY, 0xba,
	92	DATA_ONLY, 0xa8,
	93	DATA_ONLY, 0xac,
	94	DATA_ONLY, 0xb1,
	95	DATA_ONLY, 0x9d,
	96	DATA_ONLY, 0xc1,
	97	DATA_ONLY, 0xc1,
	98	DATA_ONLY, 0xb7,
	99	DATA_ONLY, 0x00,
	100	DATA_ONLY, 0x9c,
	101	DATA_ONLY, 0x00,
	102	DATA_ONLY, 0x9f,
	103	DATA_ONLY, 0x00,
	104	DATA_ONLY, 0xd6,
	105
	106	0xfa, 0x01,
	107
	108	ENDDEF, 0x0000
	109	};
	110
4a959e59	111	static const unsigned short seq_etc_condition_set[] = {
ee378a5c ID	112	0xf6, 0x00,
	113	DATA_ONLY, 0x8c,
	114	DATA_ONLY, 0x07,
	115
	116	0xb3, 0xc,
	117
	118	0xb5, 0x2c,
	119	DATA_ONLY, 0x12,
	120	DATA_ONLY, 0x0c,
	121	DATA_ONLY, 0x0a,
	122	DATA_ONLY, 0x10,
	123	DATA_ONLY, 0x0e,
	124	DATA_ONLY, 0x17,
	125	DATA_ONLY, 0x13,
	126	DATA_ONLY, 0x1f,
	127	DATA_ONLY, 0x1a,
	128	DATA_ONLY, 0x2a,
	129	DATA_ONLY, 0x24,
	130	DATA_ONLY, 0x1f,
	131	DATA_ONLY, 0x1b,
	132	DATA_ONLY, 0x1a,
	133	DATA_ONLY, 0x17,
	134
	135	DATA_ONLY, 0x2b,
	136	DATA_ONLY, 0x26,
	137	DATA_ONLY, 0x22,
	138	DATA_ONLY, 0x20,
	139	DATA_ONLY, 0x3a,
	140	DATA_ONLY, 0x34,
	141	DATA_ONLY, 0x30,
	142	DATA_ONLY, 0x2c,
	143	DATA_ONLY, 0x29,
	144	DATA_ONLY, 0x26,
	145	DATA_ONLY, 0x25,
	146	DATA_ONLY, 0x23,
	147	DATA_ONLY, 0x21,
	148	DATA_ONLY, 0x20,
	149	DATA_ONLY, 0x1e,
	150	DATA_ONLY, 0x1e,
	151
	152	0xb6, 0x00,
	153	DATA_ONLY, 0x00,
	154	DATA_ONLY, 0x11,
	155	DATA_ONLY, 0x22,
	156	DATA_ONLY, 0x33,
	157	DATA_ONLY, 0x44,
	158	DATA_ONLY, 0x44,
	159	DATA_ONLY, 0x44,
	160
	161	DATA_ONLY, 0x55,
	162	DATA_ONLY, 0x55,
	163	DATA_ONLY, 0x66,
	164	DATA_ONLY, 0x66,
	165	DATA_ONLY, 0x66,
	166	DATA_ONLY, 0x66,
	167	DATA_ONLY, 0x66,
	168	DATA_ONLY, 0x66,
	169
	170	0xb7, 0x2c,
	171	DATA_ONLY, 0x12,
	172	DATA_ONLY, 0x0c,
	173	DATA_ONLY, 0x0a,
	174	DATA_ONLY, 0x10,
	175	DATA_ONLY, 0x0e,
176	DATA_ONLY, 0x17,
177	DATA_ONLY, 0x13,
178	DATA_ONLY, 0x1f,
179	DATA_ONLY, 0x1a,
180	DATA_ONLY, 0x2a,
181	DATA_ONLY, 0x24,
182	DATA_ONLY, 0x1f,
183	DATA_ONLY, 0x1b,
184	DATA_ONLY, 0x1a,
185	DATA_ONLY, 0x17,
186
187	DATA_ONLY, 0x2b,
188	DATA_ONLY, 0x26,
189	DATA_ONLY, 0x22,
190	DATA_ONLY, 0x20,
191	DATA_ONLY, 0x3a,
192	DATA_ONLY, 0x34,
193	DATA_ONLY, 0x30,
194	DATA_ONLY, 0x2c,
195	DATA_ONLY, 0x29,
196	DATA_ONLY, 0x26,
197	DATA_ONLY, 0x25,
198	DATA_ONLY, 0x23,
199	DATA_ONLY, 0x21,
200	DATA_ONLY, 0x20,
201	DATA_ONLY, 0x1e,
202	DATA_ONLY, 0x1e,
203
204	0xb8, 0x00,
205	DATA_ONLY, 0x00,
206	DATA_ONLY, 0x11,
207	DATA_ONLY, 0x22,
208	DATA_ONLY, 0x33,
209	DATA_ONLY, 0x44,
210	DATA_ONLY, 0x44,
211	DATA_ONLY, 0x44,
212
213	DATA_ONLY, 0x55,
214	DATA_ONLY, 0x55,
215	DATA_ONLY, 0x66,
216	DATA_ONLY, 0x66,
217	DATA_ONLY, 0x66,
218	DATA_ONLY, 0x66,
219	DATA_ONLY, 0x66,
220	DATA_ONLY, 0x66,
221
222	0xb9, 0x2c,
223	DATA_ONLY, 0x12,
224	DATA_ONLY, 0x0c,
225	DATA_ONLY, 0x0a,
226	DATA_ONLY, 0x10,
227	DATA_ONLY, 0x0e,
228	DATA_ONLY, 0x17,
229	DATA_ONLY, 0x13,
230	DATA_ONLY, 0x1f,
231	DATA_ONLY, 0x1a,
232	DATA_ONLY, 0x2a,
233	DATA_ONLY, 0x24,
234	DATA_ONLY, 0x1f,
235	DATA_ONLY, 0x1b,
236	DATA_ONLY, 0x1a,
237	DATA_ONLY, 0x17,
238
239	DATA_ONLY, 0x2b,
240	DATA_ONLY, 0x26,
241	DATA_ONLY, 0x22,
242	DATA_ONLY, 0x20,
243	DATA_ONLY, 0x3a,
244	DATA_ONLY, 0x34,
245	DATA_ONLY, 0x30,
246	DATA_ONLY, 0x2c,
247	DATA_ONLY, 0x29,
248	DATA_ONLY, 0x26,
249	DATA_ONLY, 0x25,
250	DATA_ONLY, 0x23,
251	DATA_ONLY, 0x21,
252	DATA_ONLY, 0x20,
253	DATA_ONLY, 0x1e,
254	DATA_ONLY, 0x1e,
255
256	0xba, 0x00,
257	DATA_ONLY, 0x00,
258	DATA_ONLY, 0x11,
259	DATA_ONLY, 0x22,
260	DATA_ONLY, 0x33,
261	DATA_ONLY, 0x44,
262	DATA_ONLY, 0x44,
263	DATA_ONLY, 0x44,
264
265	DATA_ONLY, 0x55,
266	DATA_ONLY, 0x55,
267	DATA_ONLY, 0x66,
268	DATA_ONLY, 0x66,
269	DATA_ONLY, 0x66,
270	DATA_ONLY, 0x66,
271	DATA_ONLY, 0x66,
272	DATA_ONLY, 0x66,
273
274	0xc1, 0x4d,
275	DATA_ONLY, 0x96,
276	DATA_ONLY, 0x1d,
277	DATA_ONLY, 0x00,
278	DATA_ONLY, 0x00,
279	DATA_ONLY, 0x01,
280	DATA_ONLY, 0xdf,
281	DATA_ONLY, 0x00,
282	DATA_ONLY, 0x00,
283	DATA_ONLY, 0x03,
284	DATA_ONLY, 0x1f,
285	DATA_ONLY, 0x00,
286	DATA_ONLY, 0x00,
287	DATA_ONLY, 0x00,
288	DATA_ONLY, 0x00,
289	DATA_ONLY, 0x00,
290	DATA_ONLY, 0x00,
291	DATA_ONLY, 0x00,
292	DATA_ONLY, 0x00,
293	DATA_ONLY, 0x03,
294	DATA_ONLY, 0x06,
295	DATA_ONLY, 0x09,
296	DATA_ONLY, 0x0d,
297	DATA_ONLY, 0x0f,
298	DATA_ONLY, 0x12,
299	DATA_ONLY, 0x15,
300	DATA_ONLY, 0x18,
301
302	0xb2, 0x10,
303	DATA_ONLY, 0x10,
304	DATA_ONLY, 0x0b,
305	DATA_ONLY, 0x05,
306
307	ENDDEF, 0x0000
308	};
309
4a959e59	310	static const unsigned short seq_acl_on[] = {
ee378a5c ID	311	/* ACL on */
	312	0xc0, 0x01,
	313
	314	ENDDEF, 0x0000
	315	};
	316
4a959e59	317	static const unsigned short seq_acl_off[] = {
ee378a5c ID	318	/* ACL off */
	319	0xc0, 0x00,
	320
	321	ENDDEF, 0x0000
	322	};
	323
4a959e59	324	static const unsigned short seq_elvss_on[] = {
ee378a5c ID	325	/* ELVSS on */
	326	0xb1, 0x0b,
	327
	328	ENDDEF, 0x0000
	329	};
	330
4a959e59	331	static const unsigned short seq_elvss_off[] = {
ee378a5c ID	332	/* ELVSS off */
	333	0xb1, 0x0a,
	334
	335	ENDDEF, 0x0000
	336	};
	337
4a959e59	338	static const unsigned short seq_stand_by_off[] = {
ee378a5c ID	339	0x11, COMMAND_ONLY,
	340
	341	ENDDEF, 0x0000
	342	};
	343
4a959e59	344	static const unsigned short seq_stand_by_on[] = {
ee378a5c ID	345	0x10, COMMAND_ONLY,
	346
	347	ENDDEF, 0x0000
	348	};
	349
4a959e59	350	static const unsigned short seq_display_on[] = {
ee378a5c ID	351	0x29, COMMAND_ONLY,
	352
	353	ENDDEF, 0x0000
	354	};
	355
	356
	357	static int s6e63m0_spi_write_byte(struct s6e63m0 *lcd, int addr, int data)
	358	{
	359	u16 buf[1];
	360	struct spi_message msg;
	361
	362	struct spi_transfer xfer = {
	363	.len = 2,
	364	.tx_buf = buf,
	365	};
	366
	367	buf[0] = (addr << 8) \| data;
	368
	369	spi_message_init(&msg);
	370	spi_message_add_tail(&xfer, &msg);
	371
	372	return spi_sync(lcd->spi, &msg);
	373	}
	374
	375	static int s6e63m0_spi_write(struct s6e63m0 *lcd, unsigned char address,
	376	unsigned char command)
	377	{
	378	int ret = 0;
	379
	380	if (address != DATA_ONLY)
	381	ret = s6e63m0_spi_write_byte(lcd, 0x0, address);
	382	if (command != COMMAND_ONLY)
	383	ret = s6e63m0_spi_write_byte(lcd, 0x1, command);
	384
	385	return ret;
	386	}
	387
	388	static int s6e63m0_panel_send_sequence(struct s6e63m0 *lcd,
	389	const unsigned short *wbuf)
	390	{
	391	int ret = 0, i = 0;
	392
	393	while ((wbuf[i] & DEFMASK) != ENDDEF) {
	394	if ((wbuf[i] & DEFMASK) != SLEEPMSEC) {
	395	ret = s6e63m0_spi_write(lcd, wbuf[i], wbuf[i+1]);
	396	if (ret)
	397	break;
97a4d9d5 JH	398	} else {
	399	msleep(wbuf[i+1]);
	400	}
ee378a5c ID	401	i += 2;
	402	}
	403
	404	return ret;
	405	}
	406
	407	static int _s6e63m0_gamma_ctl(struct s6e63m0 lcd, const unsigned int gamma)
	408	{
	409	unsigned int i = 0;
	410	int ret = 0;
	411
	412	/* disable gamma table updating. */
	413	ret = s6e63m0_spi_write(lcd, 0xfa, 0x00);
	414	if (ret) {
	415	dev_err(lcd->dev, "failed to disable gamma table updating.\n");
	416	goto gamma_err;
	417	}
	418
	419	for (i = 0 ; i < GAMMA_TABLE_COUNT; i++) {
	420	ret = s6e63m0_spi_write(lcd, DATA_ONLY, gamma[i]);
	421	if (ret) {
	422	dev_err(lcd->dev, "failed to set gamma table.\n");
	423	goto gamma_err;
	424	}
	425	}
	426
	427	/* update gamma table. */
	428	ret = s6e63m0_spi_write(lcd, 0xfa, 0x01);
	429	if (ret)
	430	dev_err(lcd->dev, "failed to update gamma table.\n");
	431
	432	gamma_err:
	433	return ret;
	434	}
	435
	436	static int s6e63m0_gamma_ctl(struct s6e63m0 *lcd, int gamma)
	437	{
	438	int ret = 0;
	439
	440	ret = _s6e63m0_gamma_ctl(lcd, gamma_table.gamma_22_table[gamma]);
	441
	442	return ret;
	443	}
	444
	445
	446	static int s6e63m0_ldi_init(struct s6e63m0 *lcd)
	447	{
	448	int ret, i;
	449	const unsigned short *init_seq[] = {
4a959e59 JH	450	seq_panel_condition_set,
	451	seq_display_condition_set,
	452	seq_gamma_setting,
	453	seq_etc_condition_set,
	454	seq_acl_on,
	455	seq_elvss_on,
ee378a5c ID	456	};
	457
	458	for (i = 0; i < ARRAY_SIZE(init_seq); i++) {
	459	ret = s6e63m0_panel_send_sequence(lcd, init_seq[i]);
	460	if (ret)
	461	break;
	462	}
	463
	464	return ret;
	465	}
	466
	467	static int s6e63m0_ldi_enable(struct s6e63m0 *lcd)
	468	{
	469	int ret = 0, i;
	470	const unsigned short *enable_seq[] = {
4a959e59 JH	471	seq_stand_by_off,
4a959e59 JH	472	seq_display_on,
ee378a5c ID	473	};
	474
	475	for (i = 0; i < ARRAY_SIZE(enable_seq); i++) {
	476	ret = s6e63m0_panel_send_sequence(lcd, enable_seq[i]);
	477	if (ret)
	478	break;
	479	}
	480
	481	return ret;
	482	}
	483
	484	static int s6e63m0_ldi_disable(struct s6e63m0 *lcd)
	485	{
	486	int ret;
	487
4a959e59	488	ret = s6e63m0_panel_send_sequence(lcd, seq_stand_by_on);
ee378a5c ID	489
	490	return ret;
	491	}
	492
892dc2e6 JH	493	static int s6e63m0_power_is_on(int power)
	494	{
	495	return power <= FB_BLANK_NORMAL;
	496	}
	497
ee378a5c ID	498	static int s6e63m0_power_on(struct s6e63m0 *lcd)
	499	{
	500	int ret = 0;
892dc2e6 JH	501	struct lcd_platform_data *pd;
892dc2e6 JH	502	struct backlight_device *bd;
ee378a5c ID	503
ee378a5c ID	504	pd = lcd->lcd_pd;
ee378a5c	505	bd = lcd->bd;
ee378a5c ID	506
	507	if (!pd->power_on) {
	508	dev_err(lcd->dev, "power_on is NULL.\n");
81c650e3	509	return -EINVAL;
ee378a5c ID	510	}
ee378a5c ID	511
3bf3b79f JH	512	pd->power_on(lcd->ld, 1);
	513	msleep(pd->power_on_delay);
	514
ee378a5c ID	515	if (!pd->reset) {
ee378a5c ID	516	dev_err(lcd->dev, "reset is NULL.\n");
81c650e3	517	return -EINVAL;
ee378a5c ID	518	}
ee378a5c ID	519
3bf3b79f JH	520	pd->reset(lcd->ld);
	521	msleep(pd->reset_delay);
	522
ee378a5c ID	523	ret = s6e63m0_ldi_init(lcd);
	524	if (ret) {
	525	dev_err(lcd->dev, "failed to initialize ldi.\n");
	526	return ret;
	527	}
	528
	529	ret = s6e63m0_ldi_enable(lcd);
	530	if (ret) {
	531	dev_err(lcd->dev, "failed to enable ldi.\n");
	532	return ret;
	533	}
	534
	535	/* set brightness to current value after power on or resume. */
	536	ret = s6e63m0_gamma_ctl(lcd, bd->props.brightness);
	537	if (ret) {
	538	dev_err(lcd->dev, "lcd gamma setting failed.\n");
	539	return ret;
	540	}
	541
	542	return 0;
	543	}
	544
	545	static int s6e63m0_power_off(struct s6e63m0 *lcd)
	546	{
892dc2e6 JH	547	int ret;
892dc2e6 JH	548	struct lcd_platform_data *pd;
ee378a5c ID	549
ee378a5c ID	550	pd = lcd->lcd_pd;
ee378a5c ID	551
	552	ret = s6e63m0_ldi_disable(lcd);
	553	if (ret) {
	554	dev_err(lcd->dev, "lcd setting failed.\n");
	555	return -EIO;
	556	}
	557
97a4d9d5	558	msleep(pd->power_off_delay);
ee378a5c	559
892dc2e6	560	pd->power_on(lcd->ld, 0);
ee378a5c ID	561
	562	return 0;
	563	}
	564
	565	static int s6e63m0_power(struct s6e63m0 *lcd, int power)
	566	{
	567	int ret = 0;
	568
892dc2e6	569	if (s6e63m0_power_is_on(power) && !s6e63m0_power_is_on(lcd->power))
ee378a5c	570	ret = s6e63m0_power_on(lcd);
892dc2e6	571	else if (!s6e63m0_power_is_on(power) && s6e63m0_power_is_on(lcd->power))
ee378a5c ID	572	ret = s6e63m0_power_off(lcd);
	573
	574	if (!ret)
	575	lcd->power = power;
	576
	577	return ret;
	578	}
	579
	580	static int s6e63m0_set_power(struct lcd_device *ld, int power)
	581	{
	582	struct s6e63m0 *lcd = lcd_get_data(ld);
	583
	584	if (power != FB_BLANK_UNBLANK && power != FB_BLANK_POWERDOWN &&
	585	power != FB_BLANK_NORMAL) {
	586	dev_err(lcd->dev, "power value should be 0, 1 or 4.\n");
	587	return -EINVAL;
	588	}
	589
	590	return s6e63m0_power(lcd, power);
	591	}
	592
	593	static int s6e63m0_get_power(struct lcd_device *ld)
	594	{
	595	struct s6e63m0 *lcd = lcd_get_data(ld);
	596
	597	return lcd->power;
	598	}
	599
ee378a5c ID	600	static int s6e63m0_set_brightness(struct backlight_device *bd)
	601	{
	602	int ret = 0, brightness = bd->props.brightness;
	603	struct s6e63m0 *lcd = bl_get_data(bd);
	604
	605	if (brightness < MIN_BRIGHTNESS \|\|
	606	brightness > bd->props.max_brightness) {
	607	dev_err(&bd->dev, "lcd brightness should be %d to %d.\n",
	608	MIN_BRIGHTNESS, MAX_BRIGHTNESS);
	609	return -EINVAL;
	610	}
	611
	612	ret = s6e63m0_gamma_ctl(lcd, bd->props.brightness);
	613	if (ret) {
	614	dev_err(&bd->dev, "lcd brightness setting failed.\n");
	615	return -EIO;
	616	}
	617
	618	return ret;
	619	}
	620
	621	static struct lcd_ops s6e63m0_lcd_ops = {
	622	.set_power = s6e63m0_set_power,
	623	.get_power = s6e63m0_get_power,
	624	};
	625
	626	static const struct backlight_ops s6e63m0_backlight_ops = {
ee378a5c ID	627	.update_status = s6e63m0_set_brightness,
	628	};
	629
	630	static ssize_t s6e63m0_sysfs_show_gamma_mode(struct device *dev,
	631	struct device_attribute attr, char buf)
	632	{
	633	struct s6e63m0 *lcd = dev_get_drvdata(dev);
	634	char temp[10];
	635
	636	switch (lcd->gamma_mode) {
	637	case 0:
	638	sprintf(temp, "2.2 mode\n");
	639	strcat(buf, temp);
	640	break;
	641	case 1:
	642	sprintf(temp, "1.9 mode\n");
	643	strcat(buf, temp);
	644	break;
	645	case 2:
	646	sprintf(temp, "1.7 mode\n");
	647	strcat(buf, temp);
	648	break;
	649	default:
	650	dev_info(dev, "gamma mode could be 0:2.2, 1:1.9 or 2:1.7)n");
	651	break;
	652	}
	653
	654	return strlen(buf);
	655	}
	656
	657	static ssize_t s6e63m0_sysfs_store_gamma_mode(struct device *dev,
	658	struct device_attribute *attr,
	659	const char *buf, size_t len)
	660	{
	661	struct s6e63m0 *lcd = dev_get_drvdata(dev);
	662	struct backlight_device *bd = NULL;
	663	int brightness, rc;
	664
cf2b94da	665	rc = kstrtouint(buf, 0, &lcd->gamma_mode);
ee378a5c ID	666	if (rc < 0)
	667	return rc;
	668
	669	bd = lcd->bd;
	670
	671	brightness = bd->props.brightness;
	672
	673	switch (lcd->gamma_mode) {
	674	case 0:
	675	_s6e63m0_gamma_ctl(lcd, gamma_table.gamma_22_table[brightness]);
	676	break;
	677	case 1:
	678	_s6e63m0_gamma_ctl(lcd, gamma_table.gamma_19_table[brightness]);
	679	break;
	680	case 2:
	681	_s6e63m0_gamma_ctl(lcd, gamma_table.gamma_17_table[brightness]);
	682	break;
	683	default:
	684	dev_info(dev, "gamma mode could be 0:2.2, 1:1.9 or 2:1.7\n");
	685	_s6e63m0_gamma_ctl(lcd, gamma_table.gamma_22_table[brightness]);
	686	break;
	687	}
	688	return len;
	689	}
	690
	691	static DEVICE_ATTR(gamma_mode, 0644,
	692	s6e63m0_sysfs_show_gamma_mode, s6e63m0_sysfs_store_gamma_mode);
	693
	694	static ssize_t s6e63m0_sysfs_show_gamma_table(struct device *dev,
	695	struct device_attribute attr, char buf)
	696	{
	697	struct s6e63m0 *lcd = dev_get_drvdata(dev);
	698	char temp[3];
	699
39a6ec28	700	sprintf(temp, "%u\n", lcd->gamma_table_count);
ee378a5c ID	701	strcpy(buf, temp);
	702
	703	return strlen(buf);
	704	}
ed3a6787	705	static DEVICE_ATTR(gamma_table, 0444,
ee378a5c ID	706	s6e63m0_sysfs_show_gamma_table, NULL);
ee378a5c ID	707
1b9e450d	708	static int s6e63m0_probe(struct spi_device *spi)
ee378a5c ID	709	{
	710	int ret = 0;
	711	struct s6e63m0 *lcd = NULL;
	712	struct lcd_device *ld = NULL;
	713	struct backlight_device *bd = NULL;
ef22f6a7	714	struct backlight_properties props;
ee378a5c	715
541f936f	716	lcd = devm_kzalloc(&spi->dev, sizeof(struct s6e63m0), GFP_KERNEL);
ee378a5c ID	717	if (!lcd)
	718	return -ENOMEM;
	719
	720	/* s6e63m0 lcd panel uses 3-wire 9bits SPI Mode. */
	721	spi->bits_per_word = 9;
	722
	723	ret = spi_setup(spi);
	724	if (ret < 0) {
	725	dev_err(&spi->dev, "spi setup failed.\n");
541f936f	726	return ret;
ee378a5c ID	727	}
	728
	729	lcd->spi = spi;
	730	lcd->dev = &spi->dev;
	731
c512794c	732	lcd->lcd_pd = dev_get_platdata(&spi->dev);
ee378a5c ID	733	if (!lcd->lcd_pd) {
ee378a5c ID	734	dev_err(&spi->dev, "platform data is NULL.\n");
81c650e3	735	return -EINVAL;
ee378a5c ID	736	}
ee378a5c ID	737
a18863f5 JH	738	ld = devm_lcd_device_register(&spi->dev, "s6e63m0", &spi->dev, lcd,
a18863f5 JH	739	&s6e63m0_lcd_ops);
541f936f JH	740	if (IS_ERR(ld))
541f936f JH	741	return PTR_ERR(ld);
ee378a5c ID	742
	743	lcd->ld = ld;
	744
ef22f6a7 AL	745	memset(&props, 0, sizeof(struct backlight_properties));
	746	props.type = BACKLIGHT_RAW;
	747	props.max_brightness = MAX_BRIGHTNESS;
	748
a18863f5 JH	749	bd = devm_backlight_device_register(&spi->dev, "s6e63m0bl-bl",
	750	&spi->dev, lcd, &s6e63m0_backlight_ops,
	751	&props);
	752	if (IS_ERR(bd))
	753	return PTR_ERR(bd);
ee378a5c	754
ee378a5c ID	755	bd->props.brightness = MAX_BRIGHTNESS;
	756	lcd->bd = bd;
	757
	758	/*
	759	* it gets gamma table count available so it gets user
	760	* know that.
	761	*/
	762	lcd->gamma_table_count =
eeb1ef3b	763	sizeof(gamma_table) / (MAX_GAMMA_LEVEL * sizeof(int *));
ee378a5c ID	764
	765	ret = device_create_file(&(spi->dev), &dev_attr_gamma_mode);
	766	if (ret < 0)
	767	dev_err(&(spi->dev), "failed to add sysfs entries\n");
	768
	769	ret = device_create_file(&(spi->dev), &dev_attr_gamma_table);
	770	if (ret < 0)
	771	dev_err(&(spi->dev), "failed to add sysfs entries\n");
	772
	773	/*
	774	* if lcd panel was on from bootloader like u-boot then
	775	* do not lcd on.
	776	*/
	777	if (!lcd->lcd_pd->lcd_enabled) {
	778	/*
	779	* if lcd panel was off from bootloader then
	780	* current lcd status is powerdown and then
	781	* it enables lcd panel.
	782	*/
	783	lcd->power = FB_BLANK_POWERDOWN;
	784
	785	s6e63m0_power(lcd, FB_BLANK_UNBLANK);
892dc2e6	786	} else {
ee378a5c	787	lcd->power = FB_BLANK_UNBLANK;
892dc2e6	788	}
ee378a5c	789
7652c18d	790	spi_set_drvdata(spi, lcd);
ee378a5c ID	791
	792	dev_info(&spi->dev, "s6e63m0 panel driver has been probed.\n");
	793
	794	return 0;
ee378a5c ID	795	}
ee378a5c ID	796
7e4b9d0b	797	static int s6e63m0_remove(struct spi_device *spi)
ee378a5c	798	{
7652c18d	799	struct s6e63m0 *lcd = spi_get_drvdata(spi);
ee378a5c ID	800
ee378a5c ID	801	s6e63m0_power(lcd, FB_BLANK_POWERDOWN);
d974e00b AL	802	device_remove_file(&spi->dev, &dev_attr_gamma_table);
d974e00b AL	803	device_remove_file(&spi->dev, &dev_attr_gamma_mode);
ee378a5c ID	804
	805	return 0;
	806	}
	807
d50d7ac0 JH	808	#ifdef CONFIG_PM_SLEEP
d50d7ac0 JH	809	static int s6e63m0_suspend(struct device *dev)
ee378a5c	810	{
d50d7ac0	811	struct s6e63m0 *lcd = dev_get_drvdata(dev);
ee378a5c	812
d50d7ac0	813	dev_dbg(dev, "lcd->power = %d\n", lcd->power);
ee378a5c	814
ee378a5c ID	815	/*
	816	* when lcd panel is suspend, lcd panel becomes off
	817	* regardless of status.
	818	*/
b6bef463	819	return s6e63m0_power(lcd, FB_BLANK_POWERDOWN);
ee378a5c ID	820	}
ee378a5c ID	821
d50d7ac0	822	static int s6e63m0_resume(struct device *dev)
ee378a5c	823	{
d50d7ac0	824	struct s6e63m0 *lcd = dev_get_drvdata(dev);
ee378a5c	825
b6bef463	826	lcd->power = FB_BLANK_POWERDOWN;
ee378a5c	827
b6bef463	828	return s6e63m0_power(lcd, FB_BLANK_UNBLANK);
ee378a5c	829	}
ee378a5c ID	830	#endif
ee378a5c ID	831
d50d7ac0 JH	832	static SIMPLE_DEV_PM_OPS(s6e63m0_pm_ops, s6e63m0_suspend, s6e63m0_resume);
d50d7ac0 JH	833
ee378a5c ID	834	/* Power down all displays on reboot, poweroff or halt. */
	835	static void s6e63m0_shutdown(struct spi_device *spi)
	836	{
7652c18d	837	struct s6e63m0 *lcd = spi_get_drvdata(spi);
ee378a5c ID	838
	839	s6e63m0_power(lcd, FB_BLANK_POWERDOWN);
	840	}
	841
	842	static struct spi_driver s6e63m0_driver = {
	843	.driver = {
	844	.name = "s6e63m0",
d50d7ac0	845	.pm = &s6e63m0_pm_ops,
ee378a5c ID	846	},
ee378a5c ID	847	.probe = s6e63m0_probe,
d1723fa2	848	.remove = s6e63m0_remove,
ee378a5c	849	.shutdown = s6e63m0_shutdown,
ee378a5c ID	850	};
ee378a5c ID	851
462dd838	852	module_spi_driver(s6e63m0_driver);
ee378a5c ID	853
	854	MODULE_AUTHOR("InKi Dae <inki.dae@samsung.com>");
	855	MODULE_DESCRIPTION("S6E63M0 LCD Driver");
	856	MODULE_LICENSE("GPL");
	857