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    Date
    SubjectRe: [PATCH V2] backlight: add ams369fg06 amoled driver
    From
    On Wed, Jun 29, 2011 at 3:37 PM, Jingoo Han <jg1.han@samsung.com> wrote:
    > This patch adds ams369fg06 amoled panel driver. The ams369fg06
    > amoled panel (480 x 800) driver uses 3-wired SPI inteface.
    > The brightness can be controlled by gamma setting of amoled panel.
    >
    > Signed-off-by: Jingoo Han <jg1.han@samsung.com>
    > ---
    >  drivers/video/backlight/Kconfig      |    8 +
    >  drivers/video/backlight/Makefile     |    1 +
    >  drivers/video/backlight/ams369fg06.c |  642 ++++++++++++++++++++++++++++++++++
    >  3 files changed, 651 insertions(+), 0 deletions(-)
    >  create mode 100644 drivers/video/backlight/ams369fg06.c
    >
    > diff --git a/drivers/video/backlight/Kconfig b/drivers/video/backlight/Kconfig
    > index 2d93c8d..1e54b8b 100644
    > --- a/drivers/video/backlight/Kconfig
    > +++ b/drivers/video/backlight/Kconfig
    > @@ -117,6 +117,14 @@ config LCD_LD9040
    >          If you have an LD9040 Panel, say Y to enable its
    >          control driver.
    >
    > +config LCD_AMS369FG06
    > +       tristate "AMS369FG06 AMOLED LCD Driver"
    > +       depends on SPI && BACKLIGHT_CLASS_DEVICE
    > +       default n
    > +       help
    > +         If you have an AMS369FG06 AMOLED Panel, say Y to enable its
    > +         LCD control driver.
    > +
    >  endif # LCD_CLASS_DEVICE
    >
    >  #
    > diff --git a/drivers/video/backlight/Makefile b/drivers/video/backlight/Makefile
    > index ee72adb..bf1dd92 100644
    > --- a/drivers/video/backlight/Makefile
    > +++ b/drivers/video/backlight/Makefile
    > @@ -13,6 +13,7 @@ obj-$(CONFIG_LCD_TDO24M)         += tdo24m.o
    >  obj-$(CONFIG_LCD_TOSA)            += tosa_lcd.o
    >  obj-$(CONFIG_LCD_S6E63M0)      += s6e63m0.o
    >  obj-$(CONFIG_LCD_LD9040)       += ld9040.o
    > +obj-$(CONFIG_LCD_AMS369FG06)   += ams369fg06.o
    >
    >  obj-$(CONFIG_BACKLIGHT_CLASS_DEVICE) += backlight.o
    >  obj-$(CONFIG_BACKLIGHT_ATMEL_PWM)    += atmel-pwm-bl.o
    > diff --git a/drivers/video/backlight/ams369fg06.c b/drivers/video/backlight/ams369fg06.c
    > new file mode 100644
    > index 0000000..86a7daf
    > --- /dev/null
    > +++ b/drivers/video/backlight/ams369fg06.c
    > @@ -0,0 +1,642 @@
    > +/*
    > + * ams369fg06 AMOLED LCD panel driver.
    > + *
    > + * Copyright (c) 2011 Samsung Electronics Co., Ltd.
    > + * Author: Jingoo Han  <jg1.han@samsung.com>
    > + *
    > + * Derived from drivers/video/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/lcd.h>
    > +#include <linux/backlight.h>
    > +
    > +#define SLEEPMSEC              0x1000
    > +#define ENDDEF                 0x2000
    > +#define        DEFMASK                 0xFF00
    > +#define COMMAND_ONLY           0xFE
    > +#define DATA_ONLY              0xFF
    > +
    > +#define MAX_GAMMA_LEVEL                5
    > +#define GAMMA_TABLE_COUNT      21
    > +
    > +#define MIN_BRIGHTNESS         0
    > +#define MAX_BRIGHTNESS         255
    > +#define DEFAULT_BRIGHTNESS     150
    > +
    > +struct ams369fg06 {
    > +       struct device                   *dev;
    > +       struct spi_device               *spi;
    > +       unsigned int                    power;
    > +       struct lcd_device               *ld;
    > +       struct backlight_device         *bd;
    > +       struct lcd_platform_data        *lcd_pd;
    > +};
    > +
    > +static const unsigned short seq_display_on[] = {
    > +       0x14, 0x03,
    > +       ENDDEF, 0x0000
    > +};
    > +
    > +static const unsigned short seq_display_off[] = {
    > +       0x14, 0x00,
    > +       ENDDEF, 0x0000
    > +};
    > +
    > +static const unsigned short seq_stand_by_on[] = {
    > +       0x1D, 0xA1,
    > +       SLEEPMSEC, 200,
    > +       ENDDEF, 0x0000
    > +};
    > +
    > +static const unsigned short seq_stand_by_off[] = {
    > +       0x1D, 0xA0,
    > +       SLEEPMSEC, 250,
    > +       ENDDEF, 0x0000
    > +};
    > +
    > +static const unsigned short seq_setting[] = {
    > +       0x31, 0x08,
    > +       0x32, 0x14,
    > +       0x30, 0x02,
    > +       0x27, 0x01,
    > +       0x12, 0x08,
    > +       0x13, 0x08,
    > +       0x15, 0x00,
    > +       0x16, 0x00,
    > +
    > +       0xef, 0xd0,
    > +       DATA_ONLY, 0xe8,
    > +
    > +       0x39, 0x44,
    > +       0x40, 0x00,
    > +       0x41, 0x3f,
    > +       0x42, 0x2a,
    > +       0x43, 0x27,
    > +       0x44, 0x27,
    > +       0x45, 0x1f,
    > +       0x46, 0x44,
    > +       0x50, 0x00,
    > +       0x51, 0x00,
    > +       0x52, 0x17,
    > +       0x53, 0x24,
    > +       0x54, 0x26,
    > +       0x55, 0x1f,
    > +       0x56, 0x43,
    > +       0x60, 0x00,
    > +       0x61, 0x3f,
    > +       0x62, 0x2a,
    > +       0x63, 0x25,
    > +       0x64, 0x24,
    > +       0x65, 0x1b,
    > +       0x66, 0x5c,
    > +
    > +       0x17, 0x22,
    > +       0x18, 0x33,
    > +       0x19, 0x03,
    > +       0x1a, 0x01,
    > +       0x22, 0xa4,
    > +       0x23, 0x00,
    > +       0x26, 0xa0,
    > +
    > +       0x1d, 0xa0,
    > +       SLEEPMSEC, 300,
    > +
    > +       0x14, 0x03,
    > +
    > +       ENDDEF, 0x0000
    > +};
    > +
    > +/* gamma value: 2.2 */
    > +static const unsigned int ams369fg06_22_250[] = {
    > +       0x00, 0x3f, 0x2a, 0x27, 0x27, 0x1f, 0x44,
    > +       0x00, 0x00, 0x17, 0x24, 0x26, 0x1f, 0x43,
    > +       0x00, 0x3f, 0x2a, 0x25, 0x24, 0x1b, 0x5c,
    > +};
    > +
    > +static const unsigned int ams369fg06_22_200[] = {
    > +       0x00, 0x3f, 0x28, 0x29, 0x27, 0x21, 0x3e,
    > +       0x00, 0x00, 0x10, 0x25, 0x27, 0x20, 0x3d,
    > +       0x00, 0x3f, 0x28, 0x27, 0x25, 0x1d, 0x53,
    > +};
    > +
    > +static const unsigned int ams369fg06_22_150[] = {
    > +       0x00, 0x3f, 0x2d, 0x29, 0x28, 0x23, 0x37,
    > +       0x00, 0x00, 0x0b, 0x25, 0x28, 0x22, 0x36,
    > +       0x00, 0x3f, 0x2b, 0x28, 0x26, 0x1f, 0x4a,
    > +};
    > +
    > +static const unsigned int ams369fg06_22_100[] = {
    > +       0x00, 0x3f, 0x30, 0x2a, 0x2b, 0x24, 0x2f,
    > +       0x00, 0x00, 0x00, 0x25, 0x29, 0x24, 0x2e,
    > +       0x00, 0x3f, 0x2f, 0x29, 0x29, 0x21, 0x3f,
    > +};
    > +
    > +static const unsigned int ams369fg06_22_50[] = {
    > +       0x00, 0x3f, 0x3c, 0x2c, 0x2d, 0x27, 0x24,
    > +       0x00, 0x00, 0x00, 0x22, 0x2a, 0x27, 0x23,
    > +       0x00, 0x3f, 0x3b, 0x2c, 0x2b, 0x24, 0x31,
    > +};
    > +
    > +struct ams369fg06_gamma {
    > +       unsigned int *gamma_22_table[MAX_GAMMA_LEVEL];
    > +};
    > +
    > +static struct ams369fg06_gamma gamma_table = {
    > +       .gamma_22_table[0] = (unsigned int *)&ams369fg06_22_50,
    > +       .gamma_22_table[1] = (unsigned int *)&ams369fg06_22_100,
    > +       .gamma_22_table[2] = (unsigned int *)&ams369fg06_22_150,
    > +       .gamma_22_table[3] = (unsigned int *)&ams369fg06_22_200,
    > +       .gamma_22_table[4] = (unsigned int *)&ams369fg06_22_250,
    > +};
    > +
    > +static int ams369fg06_spi_write_byte(struct ams369fg06 *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;
    Does this hardware allow transferring data from the stack?
    Quoting Greg here:"SPI data, like USB data, has to come from kmalloced data,
    not from the stack, or bad things can, and will, happen"
    > +
    > +       spi_message_init(&msg);
    > +       spi_message_add_tail(&xfer, &msg);
    > +
    > +       return spi_sync(lcd->spi, &msg);
    > +}
    > +
    > +static int ams369fg06_spi_write(struct ams369fg06 *lcd, unsigned char address,
    > +       unsigned char command)
    > +{
    > +       int ret = 0;
    > +
    > +       if (address != DATA_ONLY)
    > +               ret = ams369fg06_spi_write_byte(lcd, 0x70, address);
    > +       if (command != COMMAND_ONLY)
    > +               ret = ams369fg06_spi_write_byte(lcd, 0x72, command);
    > +
    > +       return ret;
    > +}
    > +
    > +static int ams369fg06_panel_send_sequence(struct ams369fg06 *lcd,
    > +       const unsigned short *wbuf)
    > +{
    > +       int ret = 0, i = 0;
    > +
    > +       while ((wbuf[i] & DEFMASK) != ENDDEF) {
    > +               if ((wbuf[i] & DEFMASK) != SLEEPMSEC) {
    > +                       ret = ams369fg06_spi_write(lcd, wbuf[i], wbuf[i+1]);
    > +                       if (ret)
    > +                               break;
    > +               } else
    > +                       mdelay(wbuf[i+1]);
    > +               i += 2;
    > +       }
    > +
    > +       return ret;
    > +}
    > +
    > +static int _ams369fg06_gamma_ctl(struct ams369fg06 *lcd,
    > +       const unsigned int *gamma)
    > +{
    > +       unsigned int i = 0;
    > +       int ret = 0;
    > +
    > +       for (i = 0 ; i < GAMMA_TABLE_COUNT / 3; i++) {
    > +               ret = ams369fg06_spi_write(lcd, 0x40 + i, gamma[i]);
    > +               ret = ams369fg06_spi_write(lcd, 0x50 + i, gamma[i+7*1]);
    > +               ret = ams369fg06_spi_write(lcd, 0x60 + i, gamma[i+7*2]);
    > +               if (ret) {
    > +                       dev_err(lcd->dev, "failed to set gamma table.\n");
    > +                       goto gamma_err;
    > +               }
    > +       }
    > +
    > +gamma_err:
    > +       return ret;
    > +}
    > +
    > +static int ams369fg06_gamma_ctl(struct ams369fg06 *lcd, int brightness)
    > +{
    > +       int ret = 0;
    > +       int gamma = 0;
    > +
    > +       if ((brightness >= 0) && (brightness <= 50))
    > +               gamma = 0;
    > +       else if ((brightness > 50) && (brightness <= 100))
    > +               gamma = 1;
    > +       else if ((brightness > 100) && (brightness <= 150))
    > +               gamma = 2;
    > +       else if ((brightness > 150) && (brightness <= 200))
    > +               gamma = 3;
    > +       else if ((brightness > 200) && (brightness <= 255))
    > +               gamma = 4;
    > +
    > +       ret = _ams369fg06_gamma_ctl(lcd, gamma_table.gamma_22_table[gamma]);
    > +
    > +       return ret;
    > +}
    > +
    > +static int ams369fg06_ldi_init(struct ams369fg06 *lcd)
    > +{
    > +       int ret, i;
    > +       static const unsigned short *init_seq[] = {
    > +               seq_setting,
    > +               seq_stand_by_off,
    > +       };
    > +
    > +       for (i = 0; i < ARRAY_SIZE(init_seq); i++) {
    > +               ret = ams369fg06_panel_send_sequence(lcd, init_seq[i]);
    > +               if (ret)
    > +                       break;
    > +       }
    > +
    > +       return ret;
    > +}
    > +
    > +static int ams369fg06_ldi_enable(struct ams369fg06 *lcd)
    > +{
    > +       int ret, i;
    > +       static const unsigned short *init_seq[] = {
    > +               seq_stand_by_off,
    > +               seq_display_on,
    > +       };
    > +
    > +       for (i = 0; i < ARRAY_SIZE(init_seq); i++) {
    > +               ret = ams369fg06_panel_send_sequence(lcd, init_seq[i]);
    > +               if (ret)
    > +                       break;
    > +       }
    > +
    > +       return ret;
    > +}
    > +
    > +static int ams369fg06_ldi_disable(struct ams369fg06 *lcd)
    > +{
    > +       int ret, i;
    > +
    > +       static const unsigned short *init_seq[] = {
    > +               seq_display_off,
    > +               seq_stand_by_on,
    > +       };
    > +
    > +       for (i = 0; i < ARRAY_SIZE(init_seq); i++) {
    > +               ret = ams369fg06_panel_send_sequence(lcd, init_seq[i]);
    > +               if (ret)
    > +                       break;
    > +       }
    > +
    > +       return ret;
    > +}
    > +
    > +static int ams369fg06_power_is_on(int power)
    > +{
    > +       return ((power) <= FB_BLANK_NORMAL);
    > +}
    Don't you think this should be inline ?
    > +
    > +static int ams369fg06_power_on(struct ams369fg06 *lcd)
    > +{
    > +       int ret = 0;
    > +       struct lcd_platform_data *pd = NULL;
    > +       struct backlight_device *bd = NULL;
    > +
    > +       pd = lcd->lcd_pd;
    > +       if (!pd) {
    > +               dev_err(lcd->dev, "platform data is NULL.\n");
    > +               return -EFAULT;
    > +       }
    > +
    > +       bd = lcd->bd;
    > +       if (!bd) {
    > +               dev_err(lcd->dev, "backlight device 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 = ams369fg06_ldi_init(lcd);
    > +       if (ret) {
    > +               dev_err(lcd->dev, "failed to initialize ldi.\n");
    > +               return ret;
    > +       }
    > +
    > +       ret = ams369fg06_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 = ams369fg06_gamma_ctl(lcd, bd->props.brightness);
    > +       if (ret) {
    > +               dev_err(lcd->dev, "lcd gamma setting failed.\n");
    > +               return ret;
    > +       }
    > +
    > +       return 0;
    > +}
    > +
    > +static int ams369fg06_power_off(struct ams369fg06 *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 = ams369fg06_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 ams369fg06_power(struct ams369fg06 *lcd, int power)
    > +{
    > +       int ret = 0;
    > +
    > +       if (ams369fg06_power_is_on(power) &&
    > +               !ams369fg06_power_is_on(lcd->power))
    > +               ret = ams369fg06_power_on(lcd);
    > +       else if (!ams369fg06_power_is_on(power) &&
    > +               ams369fg06_power_is_on(lcd->power))
    > +               ret = ams369fg06_power_off(lcd);
    > +
    > +       if (!ret)
    > +               lcd->power = power;
    > +
    > +       return ret;
    > +}
    > +
    > +static int ams369fg06_get_power(struct lcd_device *ld)
    > +{
    > +       struct ams369fg06 *lcd = lcd_get_data(ld);
    > +
    > +       return lcd->power;
    > +}
    Inline ?
    > +
    > +static int ams369fg06_set_power(struct lcd_device *ld, int power)
    > +{
    > +       struct ams369fg06 *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 ams369fg06_power(lcd, power);
    > +}
    > +
    > +static int ams369fg06_get_brightness(struct backlight_device *bd)
    > +{
    > +       return bd->props.brightness;
    > +}
    inline?
    > +
    > +static int ams369fg06_set_brightness(struct backlight_device *bd)
    > +{
    > +       int ret = 0;
    > +       int brightness = bd->props.brightness;
    > +       struct ams369fg06 *lcd = dev_get_drvdata(&bd->dev);
    > +
    > +       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 = ams369fg06_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 ams369fg06_lcd_ops = {
    > +       .get_power = ams369fg06_get_power,
    > +       .set_power = ams369fg06_set_power,
    > +};
    > +
    > +static const struct backlight_ops ams369fg06_backlight_ops = {
    > +       .get_brightness = ams369fg06_get_brightness,
    > +       .update_status = ams369fg06_set_brightness,
    > +};
    > +
    > +static int __init ams369fg06_probe(struct spi_device *spi)
    > +{
    > +       int ret = 0;
    > +       struct ams369fg06 *lcd = NULL;
    > +       struct lcd_device *ld = NULL;
    > +       struct backlight_device *bd = NULL;
    > +
    > +       lcd = kzalloc(sizeof(struct ams369fg06), GFP_KERNEL);
    > +       if (!lcd)
    > +               return -ENOMEM;
    > +
    > +       /* ams369fg06 lcd panel uses 3-wire 16bits SPI Mode. */
    > +       spi->bits_per_word = 16;
    > +
    > +       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("ams369fg06", &spi->dev, lcd,
    > +               &ams369fg06_lcd_ops);
    > +       if (IS_ERR(ld)) {
    > +               ret = PTR_ERR(ld);
    > +               goto out_free_lcd;
    > +       }
    > +
    > +       lcd->ld = ld;
    > +
    > +       bd = backlight_device_register("ams369fg06-bl", &spi->dev, lcd,
    > +               &ams369fg06_backlight_ops, NULL);
    > +       if (IS_ERR(bd)) {
    > +               ret =  PTR_ERR(bd);
    > +               goto out_lcd_unregister;
    > +       }
    > +
    > +       bd->props.max_brightness = MAX_BRIGHTNESS;
    > +       bd->props.brightness = DEFAULT_BRIGHTNESS;
    > +       bd->props.type = BACKLIGHT_RAW;
    > +       lcd->bd = bd;
    > +
    > +       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;
    > +
    > +               ams369fg06_power(lcd, FB_BLANK_UNBLANK);
    > +       } else
    > +               lcd->power = FB_BLANK_UNBLANK;
    > +
    > +       dev_set_drvdata(&spi->dev, lcd);
    > +
    > +       dev_info(&spi->dev, "ams369fg06 panel driver has been probed.\n");
    > +
    > +       return 0;
    > +
    > +out_lcd_unregister:
    > +       lcd_device_unregister(ld);
    > +out_free_lcd:
    > +       kfree(lcd);
    > +       return ret;
    > +}
    > +
    > +static int __devexit ams369fg06_remove(struct spi_device *spi)
    > +{
    > +       struct ams369fg06 *lcd = dev_get_drvdata(&spi->dev);
    > +
    > +       ams369fg06_power(lcd, FB_BLANK_POWERDOWN);
    > +       lcd_device_unregister(lcd->ld);
    > +       kfree(lcd);
    > +
    > +       return 0;
    > +}
    > +
    > +#if defined(CONFIG_PM)
    > +unsigned int before_power;
    > +
    > +static int ams369fg06_suspend(struct spi_device *spi, pm_message_t mesg)
    > +{
    > +       int ret = 0;
    > +       struct ams369fg06 *lcd = dev_get_drvdata(&spi->dev);
    > +
    > +       dev_dbg(&spi->dev, "lcd->power = %d\n", lcd->power);
    > +
    > +       before_power = lcd->power;
    > +
    > +       /*
    > +        * when lcd panel is suspend, lcd panel becomes off
    > +        * regardless of status.
    > +        */
    > +       ret = ams369fg06_power(lcd, FB_BLANK_POWERDOWN);
    > +
    > +       return ret;
    > +}
    > +
    > +static int ams369fg06_resume(struct spi_device *spi)
    > +{
    > +       int ret = 0;
    > +       struct ams369fg06 *lcd = dev_get_drvdata(&spi->dev);
    > +
    > +       /*
    > +        * after suspended, if lcd panel status is FB_BLANK_UNBLANK
    > +        * (at that time, before_power is FB_BLANK_UNBLANK) then
    > +        * it changes that status to FB_BLANK_POWERDOWN to get lcd on.
    > +        */
    > +       if (before_power == FB_BLANK_UNBLANK)
    > +               lcd->power = FB_BLANK_POWERDOWN;
    > +
    > +       dev_dbg(&spi->dev, "before_power = %d\n", before_power);
    > +
    > +       ret = ams369fg06_power(lcd, before_power);
    > +
    > +       return ret;
    > +}
    > +#else
    > +#define ams369fg06_suspend     NULL
    > +#define ams369fg06_resume      NULL
    > +#endif
    > +
    > +void ams369fg06_shutdown(struct spi_device *spi)
    > +{
    > +       struct ams369fg06 *lcd = dev_get_drvdata(&spi->dev);
    > +
    > +       ams369fg06_power(lcd, FB_BLANK_POWERDOWN);
    > +}
    > +
    > +static struct spi_driver ams369fg06_driver = {
    > +       .driver = {
    > +               .name   = "ams369fg06",
    > +               .bus    = &spi_bus_type,
    > +               .owner  = THIS_MODULE,
    > +       },
    > +       .probe          = ams369fg06_probe,
    > +       .remove         = __devexit_p(ams369fg06_remove),
    > +       .shutdown       = ams369fg06_shutdown,
    > +       .suspend        = ams369fg06_suspend,
    > +       .resume         = ams369fg06_resume,
    > +};
    > +
    > +static int __init ams369fg06_init(void)
    > +{
    > +       return spi_register_driver(&ams369fg06_driver);
    > +}
    > +
    > +static void __exit ams369fg06_exit(void)
    > +{
    > +       spi_unregister_driver(&ams369fg06_driver);
    > +}
    > +
    > +module_init(ams369fg06_init);
    > +module_exit(ams369fg06_exit);
    > +
    > +MODULE_AUTHOR("Jingoo Han <jg1.han@samsung.com>");
    > +MODULE_DESCRIPTION("ams369fg06 LCD Driver");
    > +MODULE_LICENSE("GPL");
    > --
    > 1.7.1
    >
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