Adding upstream version 4.19.249.upstream/4.19.249

Signed-off-by: Daniel Baumann <daniel.baumann@progress-linux.org>

1 files changed, 811 insertions, 0 deletions

diff --git a/drivers/video/backlight/ld9040.c b/drivers/video/backlight/ld9040.c
new file mode 100644
index 000000000..677f8abba
--- /dev/null
+++ b/drivers/video/backlight/ld9040.c
@@ -0,0 +1,811 @@
+/*
+ * ld9040 AMOLED LCD panel driver.
+ *
+ * Copyright (c) 2011 Samsung Electronics
+ * Author: Donghwa Lee  <dh09.lee@samsung.com>
+ * Derived from drivers/video/backlight/s6e63m0.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/regulator/consumer.h>
+#include <linux/spi/spi.h>
+#include <linux/wait.h>
+
+#include "ld9040_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		24
+
+struct ld9040 {
+	struct device			*dev;
+	struct spi_device		*spi;
+	unsigned int			power;
+	unsigned int			current_brightness;
+
+	struct lcd_device		*ld;
+	struct backlight_device		*bd;
+	struct lcd_platform_data	*lcd_pd;
+
+	struct mutex			lock;
+	bool  enabled;
+};
+
+static struct regulator_bulk_data supplies[] = {
+	{ .supply = "vdd3", },
+	{ .supply = "vci", },
+};
+
+static void ld9040_regulator_enable(struct ld9040 *lcd)
+{
+	int ret = 0;
+	struct lcd_platform_data *pd = NULL;
+
+	pd = lcd->lcd_pd;
+	mutex_lock(&lcd->lock);
+	if (!lcd->enabled) {
+		ret = regulator_bulk_enable(ARRAY_SIZE(supplies), supplies);
+		if (ret)
+			goto out;
+
+		lcd->enabled = true;
+	}
+	msleep(pd->power_on_delay);
+out:
+	mutex_unlock(&lcd->lock);
+}
+
+static void ld9040_regulator_disable(struct ld9040 *lcd)
+{
+	int ret = 0;
+
+	mutex_lock(&lcd->lock);
+	if (lcd->enabled) {
+		ret = regulator_bulk_disable(ARRAY_SIZE(supplies), supplies);
+		if (ret)
+			goto out;
+
+		lcd->enabled = false;
+	}
+out:
+	mutex_unlock(&lcd->lock);
+}
+
+static const unsigned short seq_swreset[] = {
+	0x01, COMMAND_ONLY,
+	ENDDEF, 0x00
+};
+
+static const unsigned short seq_user_setting[] = {
+	0xF0, 0x5A,
+
+	DATA_ONLY, 0x5A,
+	ENDDEF, 0x00
+};
+
+static const unsigned short seq_elvss_on[] = {
+	0xB1, 0x0D,
+
+	DATA_ONLY, 0x00,
+	DATA_ONLY, 0x16,
+	ENDDEF, 0x00
+};
+
+static const unsigned short seq_gtcon[] = {
+	0xF7, 0x09,
+
+	DATA_ONLY, 0x00,
+	DATA_ONLY, 0x00,
+	ENDDEF, 0x00
+};
+
+static const unsigned short seq_panel_condition[] = {
+	0xF8, 0x05,
+
+	DATA_ONLY, 0x65,
+	DATA_ONLY, 0x96,
+	DATA_ONLY, 0x71,
+	DATA_ONLY, 0x7D,
+	DATA_ONLY, 0x19,
+	DATA_ONLY, 0x3B,
+	DATA_ONLY, 0x0D,
+	DATA_ONLY, 0x19,
+	DATA_ONLY, 0x7E,
+	DATA_ONLY, 0x0D,
+	DATA_ONLY, 0xE2,
+	DATA_ONLY, 0x00,
+	DATA_ONLY, 0x00,
+	DATA_ONLY, 0x7E,
+	DATA_ONLY, 0x7D,
+	DATA_ONLY, 0x07,
+	DATA_ONLY, 0x07,
+	DATA_ONLY, 0x20,
+	DATA_ONLY, 0x20,
+	DATA_ONLY, 0x20,
+	DATA_ONLY, 0x02,
+	DATA_ONLY, 0x02,
+	ENDDEF, 0x00
+};
+
+static const unsigned short seq_gamma_set1[] = {
+	0xF9, 0x00,
+
+	DATA_ONLY, 0xA7,
+	DATA_ONLY, 0xB4,
+	DATA_ONLY, 0xAE,
+	DATA_ONLY, 0xBF,
+	DATA_ONLY, 0x00,
+	DATA_ONLY, 0x91,
+	DATA_ONLY, 0x00,
+	DATA_ONLY, 0xB2,
+	DATA_ONLY, 0xB4,
+	DATA_ONLY, 0xAA,
+	DATA_ONLY, 0xBB,
+	DATA_ONLY, 0x00,
+	DATA_ONLY, 0xAC,
+	DATA_ONLY, 0x00,
+	DATA_ONLY, 0xB3,
+	DATA_ONLY, 0xB1,
+	DATA_ONLY, 0xAA,
+	DATA_ONLY, 0xBC,
+	DATA_ONLY, 0x00,
+	DATA_ONLY, 0xB3,
+	ENDDEF, 0x00
+};
+
+static const unsigned short seq_gamma_ctrl[] = {
+	0xFB, 0x02,
+
+	DATA_ONLY, 0x5A,
+	ENDDEF, 0x00
+};
+
+static const unsigned short seq_gamma_start[] = {
+	0xF9, COMMAND_ONLY,
+
+	ENDDEF, 0x00
+};
+
+static const unsigned short seq_apon[] = {
+	0xF3, 0x00,
+
+	DATA_ONLY, 0x00,
+	DATA_ONLY, 0x00,
+	DATA_ONLY, 0x0A,
+	DATA_ONLY, 0x02,
+	ENDDEF, 0x00
+};
+
+static const unsigned short seq_display_ctrl[] = {
+	0xF2, 0x02,
+
+	DATA_ONLY, 0x08,
+	DATA_ONLY, 0x08,
+	DATA_ONLY, 0x10,
+	DATA_ONLY, 0x10,
+	ENDDEF, 0x00
+};
+
+static const unsigned short seq_manual_pwr[] = {
+	0xB0, 0x04,
+	ENDDEF, 0x00
+};
+
+static const unsigned short seq_pwr_ctrl[] = {
+	0xF4, 0x0A,
+
+	DATA_ONLY, 0x87,
+	DATA_ONLY, 0x25,
+	DATA_ONLY, 0x6A,
+	DATA_ONLY, 0x44,
+	DATA_ONLY, 0x02,
+	DATA_ONLY, 0x88,
+	ENDDEF, 0x00
+};
+
+static const unsigned short seq_sleep_out[] = {
+	0x11, COMMAND_ONLY,
+	ENDDEF, 0x00
+};
+
+static const unsigned short seq_sleep_in[] = {
+	0x10, COMMAND_ONLY,
+	ENDDEF, 0x00
+};
+
+static const unsigned short seq_display_on[] = {
+	0x29, COMMAND_ONLY,
+	ENDDEF, 0x00
+};
+
+static const unsigned short seq_display_off[] = {
+	0x28, COMMAND_ONLY,
+	ENDDEF, 0x00
+};
+
+static const unsigned short seq_vci1_1st_en[] = {
+	0xF3, 0x10,
+
+	DATA_ONLY, 0x00,
+	DATA_ONLY, 0x00,
+	DATA_ONLY, 0x00,
+	DATA_ONLY, 0x02,
+	ENDDEF, 0x00
+};
+
+static const unsigned short seq_vl1_en[] = {
+	0xF3, 0x11,
+
+	DATA_ONLY, 0x00,
+	DATA_ONLY, 0x00,
+	DATA_ONLY, 0x00,
+	DATA_ONLY, 0x02,
+	ENDDEF, 0x00
+};
+
+static const unsigned short seq_vl2_en[] = {
+	0xF3, 0x13,
+
+	DATA_ONLY, 0x00,
+	DATA_ONLY, 0x00,
+	DATA_ONLY, 0x00,
+	DATA_ONLY, 0x02,
+	ENDDEF, 0x00
+};
+
+static const unsigned short seq_vci1_2nd_en[] = {
+	0xF3, 0x33,
+
+	DATA_ONLY, 0x00,
+	DATA_ONLY, 0x00,
+	DATA_ONLY, 0x00,
+	DATA_ONLY, 0x02,
+	ENDDEF, 0x00
+};
+
+static const unsigned short seq_vl3_en[] = {
+	0xF3, 0x37,
+
+	DATA_ONLY, 0x00,
+	DATA_ONLY, 0x00,
+	DATA_ONLY, 0x00,
+	DATA_ONLY, 0x02,
+	ENDDEF, 0x00
+};
+
+static const unsigned short seq_vreg1_amp_en[] = {
+	0xF3, 0x37,
+
+	DATA_ONLY, 0x01,
+	DATA_ONLY, 0x00,
+	DATA_ONLY, 0x00,
+	DATA_ONLY, 0x02,
+	ENDDEF, 0x00
+};
+
+static const unsigned short seq_vgh_amp_en[] = {
+	0xF3, 0x37,
+
+	DATA_ONLY, 0x11,
+	DATA_ONLY, 0x00,
+	DATA_ONLY, 0x00,
+	DATA_ONLY, 0x02,
+	ENDDEF, 0x00
+};
+
+static const unsigned short seq_vgl_amp_en[] = {
+	0xF3, 0x37,
+
+	DATA_ONLY, 0x31,
+	DATA_ONLY, 0x00,
+	DATA_ONLY, 0x00,
+	DATA_ONLY, 0x02,
+	ENDDEF, 0x00
+};
+
+static const unsigned short seq_vmos_amp_en[] = {
+	0xF3, 0x37,
+
+	DATA_ONLY, 0xB1,
+	DATA_ONLY, 0x00,
+	DATA_ONLY, 0x00,
+	DATA_ONLY, 0x03,
+	ENDDEF, 0x00
+};
+
+static const unsigned short seq_vint_amp_en[] = {
+	0xF3, 0x37,
+
+	DATA_ONLY, 0xF1,
+	/* DATA_ONLY, 0x71,	VMOS/VBL/VBH not used */
+	DATA_ONLY, 0x00,
+	DATA_ONLY, 0x00,
+	DATA_ONLY, 0x03,
+	/* DATA_ONLY, 0x02,	VMOS/VBL/VBH not used */
+	ENDDEF, 0x00
+};
+
+static const unsigned short seq_vbh_amp_en[] = {
+	0xF3, 0x37,
+
+	DATA_ONLY, 0xF9,
+	DATA_ONLY, 0x00,
+	DATA_ONLY, 0x00,
+	DATA_ONLY, 0x03,
+	ENDDEF, 0x00
+};
+
+static const unsigned short seq_vbl_amp_en[] = {
+	0xF3, 0x37,
+
+	DATA_ONLY, 0xFD,
+	DATA_ONLY, 0x00,
+	DATA_ONLY, 0x00,
+	DATA_ONLY, 0x03,
+	ENDDEF, 0x00
+};
+
+static const unsigned short seq_gam_amp_en[] = {
+	0xF3, 0x37,
+
+	DATA_ONLY, 0xFF,
+	/* DATA_ONLY, 0x73,	VMOS/VBL/VBH not used */
+	DATA_ONLY, 0x00,
+	DATA_ONLY, 0x00,
+	DATA_ONLY, 0x03,
+	/* DATA_ONLY, 0x02,	VMOS/VBL/VBH not used */
+	ENDDEF, 0x00
+};
+
+static const unsigned short seq_sd_amp_en[] = {
+	0xF3, 0x37,
+
+	DATA_ONLY, 0xFF,
+	/* DATA_ONLY, 0x73,	VMOS/VBL/VBH not used */
+	DATA_ONLY, 0x80,
+	DATA_ONLY, 0x00,
+	DATA_ONLY, 0x03,
+	/* DATA_ONLY, 0x02,	VMOS/VBL/VBH not used */
+	ENDDEF, 0x00
+};
+
+static const unsigned short seq_gls_en[] = {
+	0xF3, 0x37,
+
+	DATA_ONLY, 0xFF,
+	/* DATA_ONLY, 0x73,	VMOS/VBL/VBH not used */
+	DATA_ONLY, 0x81,
+	DATA_ONLY, 0x00,
+	DATA_ONLY, 0x03,
+	/* DATA_ONLY, 0x02,	VMOS/VBL/VBH not used */
+	ENDDEF, 0x00
+};
+
+static const unsigned short seq_els_en[] = {
+	0xF3, 0x37,
+
+	DATA_ONLY, 0xFF,
+	/* DATA_ONLY, 0x73,	VMOS/VBL/VBH not used */
+	DATA_ONLY, 0x83,
+	DATA_ONLY, 0x00,
+	DATA_ONLY, 0x03,
+	/* DATA_ONLY, 0x02,	VMOS/VBL/VBH not used */
+	ENDDEF, 0x00
+};
+
+static const unsigned short seq_el_on[] = {
+	0xF3, 0x37,
+
+	DATA_ONLY, 0xFF,
+	/* DATA_ONLY, 0x73,	VMOS/VBL/VBH not used */
+	DATA_ONLY, 0x87,
+	DATA_ONLY, 0x00,
+	DATA_ONLY, 0x03,
+	/* DATA_ONLY, 0x02,	VMOS/VBL/VBH not used */
+	ENDDEF, 0x00
+};
+
+static int ld9040_spi_write_byte(struct ld9040 *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 ld9040_spi_write(struct ld9040 *lcd, unsigned char address,
+	unsigned char command)
+{
+	int ret = 0;
+
+	if (address != DATA_ONLY)
+		ret = ld9040_spi_write_byte(lcd, 0x0, address);
+	if (command != COMMAND_ONLY)
+		ret = ld9040_spi_write_byte(lcd, 0x1, command);
+
+	return ret;
+}
+
+static int ld9040_panel_send_sequence(struct ld9040 *lcd,
+	const unsigned short *wbuf)
+{
+	int ret = 0, i = 0;
+
+	while ((wbuf[i] & DEFMASK) != ENDDEF) {
+		if ((wbuf[i] & DEFMASK) != SLEEPMSEC) {
+			ret = ld9040_spi_write(lcd, wbuf[i], wbuf[i+1]);
+			if (ret)
+				break;
+		} else {
+			msleep(wbuf[i+1]);
+		}
+		i += 2;
+	}
+
+	return ret;
+}
+
+static int _ld9040_gamma_ctl(struct ld9040 *lcd, const unsigned int *gamma)
+{
+	unsigned int i = 0;
+	int ret = 0;
+
+	/* start gamma table updating. */
+	ret = ld9040_panel_send_sequence(lcd, seq_gamma_start);
+	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 = ld9040_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 = ld9040_panel_send_sequence(lcd, seq_gamma_ctrl);
+	if (ret)
+		dev_err(lcd->dev, "failed to update gamma table.\n");
+
+gamma_err:
+	return ret;
+}
+
+static int ld9040_gamma_ctl(struct ld9040 *lcd, int gamma)
+{
+	return _ld9040_gamma_ctl(lcd, gamma_table.gamma_22_table[gamma]);
+}
+
+static int ld9040_ldi_init(struct ld9040 *lcd)
+{
+	int ret, i;
+	static const unsigned short *init_seq[] = {
+		seq_user_setting,
+		seq_panel_condition,
+		seq_display_ctrl,
+		seq_manual_pwr,
+		seq_elvss_on,
+		seq_gtcon,
+		seq_gamma_set1,
+		seq_gamma_ctrl,
+		seq_sleep_out,
+	};
+
+	for (i = 0; i < ARRAY_SIZE(init_seq); i++) {
+		ret = ld9040_panel_send_sequence(lcd, init_seq[i]);
+		/* workaround: minimum delay time for transferring CMD */
+		usleep_range(300, 310);
+		if (ret)
+			break;
+	}
+
+	return ret;
+}
+
+static int ld9040_ldi_enable(struct ld9040 *lcd)
+{
+	return ld9040_panel_send_sequence(lcd, seq_display_on);
+}
+
+static int ld9040_ldi_disable(struct ld9040 *lcd)
+{
+	int ret;
+
+	ret = ld9040_panel_send_sequence(lcd, seq_display_off);
+	ret = ld9040_panel_send_sequence(lcd, seq_sleep_in);
+
+	return ret;
+}
+
+static int ld9040_power_is_on(int power)
+{
+	return power <= FB_BLANK_NORMAL;
+}
+
+static int ld9040_power_on(struct ld9040 *lcd)
+{
+	int ret = 0;
+	struct lcd_platform_data *pd;
+
+	pd = lcd->lcd_pd;
+
+	/* lcd power on */
+	ld9040_regulator_enable(lcd);
+
+	if (!pd->reset) {
+		dev_err(lcd->dev, "reset is NULL.\n");
+		return -EINVAL;
+	}
+
+	pd->reset(lcd->ld);
+	msleep(pd->reset_delay);
+
+	ret = ld9040_ldi_init(lcd);
+	if (ret) {
+		dev_err(lcd->dev, "failed to initialize ldi.\n");
+		return ret;
+	}
+
+	ret = ld9040_ldi_enable(lcd);
+	if (ret) {
+		dev_err(lcd->dev, "failed to enable ldi.\n");
+		return ret;
+	}
+
+	return 0;
+}
+
+static int ld9040_power_off(struct ld9040 *lcd)
+{
+	int ret;
+	struct lcd_platform_data *pd;
+
+	pd = lcd->lcd_pd;
+
+	ret = ld9040_ldi_disable(lcd);
+	if (ret) {
+		dev_err(lcd->dev, "lcd setting failed.\n");
+		return -EIO;
+	}
+
+	msleep(pd->power_off_delay);
+
+	/* lcd power off */
+	ld9040_regulator_disable(lcd);
+
+	return 0;
+}
+
+static int ld9040_power(struct ld9040 *lcd, int power)
+{
+	int ret = 0;
+
+	if (ld9040_power_is_on(power) && !ld9040_power_is_on(lcd->power))
+		ret = ld9040_power_on(lcd);
+	else if (!ld9040_power_is_on(power) && ld9040_power_is_on(lcd->power))
+		ret = ld9040_power_off(lcd);
+
+	if (!ret)
+		lcd->power = power;
+
+	return ret;
+}
+
+static int ld9040_set_power(struct lcd_device *ld, int power)
+{
+	struct ld9040 *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 ld9040_power(lcd, power);
+}
+
+static int ld9040_get_power(struct lcd_device *ld)
+{
+	struct ld9040 *lcd = lcd_get_data(ld);
+
+	return lcd->power;
+}
+
+static int ld9040_set_brightness(struct backlight_device *bd)
+{
+	int ret = 0, brightness = bd->props.brightness;
+	struct ld9040 *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 = ld9040_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 ld9040_lcd_ops = {
+	.set_power = ld9040_set_power,
+	.get_power = ld9040_get_power,
+};
+
+static const struct backlight_ops ld9040_backlight_ops  = {
+	.update_status = ld9040_set_brightness,
+};
+
+static int ld9040_probe(struct spi_device *spi)
+{
+	int ret = 0;
+	struct ld9040 *lcd = NULL;
+	struct lcd_device *ld = NULL;
+	struct backlight_device *bd = NULL;
+	struct backlight_properties props;
+
+	lcd = devm_kzalloc(&spi->dev, sizeof(struct ld9040), GFP_KERNEL);
+	if (!lcd)
+		return -ENOMEM;
+
+	/* ld9040 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;
+	}
+
+	mutex_init(&lcd->lock);
+
+	ret = devm_regulator_bulk_get(lcd->dev, ARRAY_SIZE(supplies), supplies);
+	if (ret) {
+		dev_err(lcd->dev, "Failed to get regulators: %d\n", ret);
+		return ret;
+	}
+
+	ld = devm_lcd_device_register(&spi->dev, "ld9040", &spi->dev, lcd,
+					&ld9040_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, "ld9040-bl", &spi->dev,
+					lcd, &ld9040_backlight_ops, &props);
+	if (IS_ERR(bd))
+		return PTR_ERR(bd);
+
+	bd->props.brightness = MAX_BRIGHTNESS;
+	lcd->bd = bd;
+
+	/*
+	 * 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;
+
+		ld9040_power(lcd, FB_BLANK_UNBLANK);
+	} else {
+		lcd->power = FB_BLANK_UNBLANK;
+	}
+
+	spi_set_drvdata(spi, lcd);
+
+	dev_info(&spi->dev, "ld9040 panel driver has been probed.\n");
+	return 0;
+}
+
+static int ld9040_remove(struct spi_device *spi)
+{
+	struct ld9040 *lcd = spi_get_drvdata(spi);
+
+	ld9040_power(lcd, FB_BLANK_POWERDOWN);
+	return 0;
+}
+
+#ifdef CONFIG_PM_SLEEP
+static int ld9040_suspend(struct device *dev)
+{
+	struct ld9040 *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 ld9040_power(lcd, FB_BLANK_POWERDOWN);
+}
+
+static int ld9040_resume(struct device *dev)
+{
+	struct ld9040 *lcd = dev_get_drvdata(dev);
+
+	lcd->power = FB_BLANK_POWERDOWN;
+
+	return ld9040_power(lcd, FB_BLANK_UNBLANK);
+}
+#endif
+
+static SIMPLE_DEV_PM_OPS(ld9040_pm_ops, ld9040_suspend, ld9040_resume);
+
+/* Power down all displays on reboot, poweroff or halt. */
+static void ld9040_shutdown(struct spi_device *spi)
+{
+	struct ld9040 *lcd = spi_get_drvdata(spi);
+
+	ld9040_power(lcd, FB_BLANK_POWERDOWN);
+}
+
+static struct spi_driver ld9040_driver = {
+	.driver = {
+		.name	= "ld9040",
+		.pm	= &ld9040_pm_ops,
+	},
+	.probe		= ld9040_probe,
+	.remove		= ld9040_remove,
+	.shutdown	= ld9040_shutdown,
+};
+
+module_spi_driver(ld9040_driver);
+
+MODULE_AUTHOR("Donghwa Lee <dh09.lee@samsung.com>");
+MODULE_DESCRIPTION("ld9040 LCD Driver");
+MODULE_LICENSE("GPL");