drivers/vidfeo/backlight: ld9040 amoled driver support
Add a ld9040 amoled panel driver.
Signed-off-by: Donghwa Lee <dh09.lee@samsung.com>
Signed-off-by: Kyungmin Park <kyungmin.park@samsung.com>
Signed-off-by: Inki Dae <inki.dae@samsung.com>
Cc: Richard Purdie <rpurdie@rpsys.net>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
diff --git a/drivers/video/backlight/ld9040.c b/drivers/video/backlight/ld9040.c
new file mode 100644
index 0000000..7281b25
--- /dev/null
+++ b/drivers/video/backlight/ld9040.c
@@ -0,0 +1,819 @@
+/*
+ * 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.
+ *
+ * This program is distributed in the hope that it will be useful, but
+ * WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
+ * General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License along
+ * with this program; if not, write to the Free Software Foundation, Inc.,
+ * 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA.
+ */
+
+#include <linux/wait.h>
+#include <linux/fb.h>
+#include <linux/delay.h>
+#include <linux/gpio.h>
+#include <linux/spi/spi.h>
+#include <linux/irq.h>
+#include <linux/interrupt.h>
+#include <linux/kernel.h>
+#include <linux/lcd.h>
+#include <linux/backlight.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
+#define power_is_on(pwr) ((pwr) <= FB_BLANK_NORMAL)
+
+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;
+};
+
+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
+ udelay(wbuf[i+1]*1000);
+ 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)
+{
+ int ret = 0;
+
+ ret = _ld9040_gamma_ctl(lcd, gamma_table.gamma_22_table[gamma]);
+
+ return ret;
+}
+
+
+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 */
+ udelay(300);
+ if (ret)
+ break;
+ }
+
+ return ret;
+}
+
+static int ld9040_ldi_enable(struct ld9040 *lcd)
+{
+ int ret = 0;
+
+ ret = ld9040_panel_send_sequence(lcd, seq_display_on);
+
+ return ret;
+}
+
+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_on(struct ld9040 *lcd)
+{
+ int ret = 0;
+ struct lcd_platform_data *pd = NULL;
+ pd = lcd->lcd_pd;
+ if (!pd) {
+ dev_err(lcd->dev, "platform data is NULL.\n");
+ return -EFAULT;
+ }
+
+ if (!pd->power_on) {
+ dev_err(lcd->dev, "power_on is NULL.\n");
+ return -EFAULT;
+ } else {
+ pd->power_on(lcd->ld, 1);
+ mdelay(pd->power_on_delay);
+ }
+
+ if (!pd->reset) {
+ dev_err(lcd->dev, "reset is NULL.\n");
+ return -EFAULT;
+ } else {
+ pd->reset(lcd->ld);
+ mdelay(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 = 0;
+ struct lcd_platform_data *pd = NULL;
+
+ pd = lcd->lcd_pd;
+ if (!pd) {
+ dev_err(lcd->dev, "platform data is NULL.\n");
+ return -EFAULT;
+ }
+
+ ret = ld9040_ldi_disable(lcd);
+ if (ret) {
+ dev_err(lcd->dev, "lcd setting failed.\n");
+ return -EIO;
+ }
+
+ mdelay(pd->power_off_delay);
+
+ if (!pd->power_on) {
+ dev_err(lcd->dev, "power_on is NULL.\n");
+ return -EFAULT;
+ } else
+ pd->power_on(lcd->ld, 0);
+
+ return 0;
+}
+
+static int ld9040_power(struct ld9040 *lcd, int power)
+{
+ int ret = 0;
+
+ if (power_is_on(power) && !power_is_on(lcd->power))
+ ret = ld9040_power_on(lcd);
+ else if (!power_is_on(power) && 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_get_brightness(struct backlight_device *bd)
+{
+ return bd->props.brightness;
+}
+
+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 = {
+ .get_brightness = ld9040_get_brightness,
+ .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;
+
+ lcd = kzalloc(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");
+ goto out_free_lcd;
+ }
+
+ lcd->spi = spi;
+ lcd->dev = &spi->dev;
+
+ lcd->lcd_pd = spi->dev.platform_data;
+ if (!lcd->lcd_pd) {
+ dev_err(&spi->dev, "platform data is NULL.\n");
+ goto out_free_lcd;
+ }
+
+ ld = lcd_device_register("ld9040", &spi->dev, lcd, &ld9040_lcd_ops);
+ if (IS_ERR(ld)) {
+ ret = PTR_ERR(ld);
+ goto out_free_lcd;
+ }
+
+ lcd->ld = ld;
+
+ bd = backlight_device_register("ld9040-bl", &spi->dev,
+ lcd, &ld9040_backlight_ops, NULL);
+ if (IS_ERR(ld)) {
+ ret = PTR_ERR(ld);
+ goto out_free_lcd;
+ }
+
+ bd->props.max_brightness = MAX_BRIGHTNESS;
+ 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;
+
+ dev_set_drvdata(&spi->dev, lcd);
+
+ dev_info(&spi->dev, "ld9040 panel driver has been probed.\n");
+ return 0;
+
+out_free_lcd:
+ kfree(lcd);
+ return ret;
+}
+
+static int __devexit ld9040_remove(struct spi_device *spi)
+{
+ struct ld9040 *lcd = dev_get_drvdata(&spi->dev);
+
+ ld9040_power(lcd, FB_BLANK_POWERDOWN);
+ lcd_device_unregister(lcd->ld);
+ kfree(lcd);
+
+ return 0;
+}
+
+#if defined(CONFIG_PM)
+static int ld9040_suspend(struct spi_device *spi, pm_message_t mesg)
+{
+ int ret = 0;
+ struct ld9040 *lcd = dev_get_drvdata(&spi->dev);
+
+ dev_dbg(&spi->dev, "lcd->power = %d\n", lcd->power);
+
+ /*
+ * when lcd panel is suspend, lcd panel becomes off
+ * regardless of status.
+ */
+ ret = ld9040_power(lcd, FB_BLANK_POWERDOWN);
+
+ return ret;
+}
+
+static int ld9040_resume(struct spi_device *spi)
+{
+ int ret = 0;
+ struct ld9040 *lcd = dev_get_drvdata(&spi->dev);
+
+ lcd->power = FB_BLANK_POWERDOWN;
+
+ ret = ld9040_power(lcd, FB_BLANK_UNBLANK);
+
+ return ret;
+}
+#else
+#define ld9040_suspend NULL
+#define ld9040_resume NULL
+#endif
+
+/* Power down all displays on reboot, poweroff or halt. */
+static void ld9040_shutdown(struct spi_device *spi)
+{
+ struct ld9040 *lcd = dev_get_drvdata(&spi->dev);
+
+ ld9040_power(lcd, FB_BLANK_POWERDOWN);
+}
+
+static struct spi_driver ld9040_driver = {
+ .driver = {
+ .name = "ld9040",
+ .bus = &spi_bus_type,
+ .owner = THIS_MODULE,
+ },
+ .probe = ld9040_probe,
+ .remove = __devexit_p(ld9040_remove),
+ .shutdown = ld9040_shutdown,
+ .suspend = ld9040_suspend,
+ .resume = ld9040_resume,
+};
+
+static int __init ld9040_init(void)
+{
+ return spi_register_driver(&ld9040_driver);
+}
+
+static void __exit ld9040_exit(void)
+{
+ spi_unregister_driver(&ld9040_driver);
+}
+
+module_init(ld9040_init);
+module_exit(ld9040_exit);
+
+MODULE_AUTHOR("Donghwa Lee <dh09.lee@samsung.com>");
+MODULE_DESCRIPTION("ld9040 LCD Driver");
+MODULE_LICENSE("GPL");