backlight: add ams369fg06 amoled driver

Add the 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.

[sfr@canb.auug.org.au: fix build error]
[axel.lin@gmail.com: unregister backlight device when unloading the module]
[axel.lin@gmail.com: staticize ams369fg06_shutdown]
Signed-off-by: Jingoo Han <jg1.han@samsung.com>
Cc: Richard Purdie <rpurdie@rpsys.net>
Cc: Inki Dae <inki.dae@samsung.com>
Cc: anish singh <anish198519851985@gmail.com>
Signed-off-by: Stephen Rothwell <sfr@canb.auug.org.au>
Signed-off-by: Axel Lin <axel.lin@gmail.com>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>

4 files changed, 653 insertions, 1 deletions

diff --git a/drivers/video/backlight/Kconfig b/drivers/video/backlight/Kconfig
index 2d93c8d61ad5..1e54b8b7f698 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 ee72adb8786e..bf1dd92b7527 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 000000000000..2c314303f915
--- /dev/null
+++ b/drivers/video/backlight/ams369fg06.c
@@ -0,0 +1,643 @@
+/*
+ * 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;
+
+        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);
+}
+
+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;
+}
+
+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;
+}
+
+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 __devinit 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);
+        backlight_device_unregister(lcd->bd);
+        lcd_device_unregister(lcd->ld);
+        kfree(lcd);
+
+        return 0;
+}
+
+#if defined(CONFIG_PM)
+static 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
+
+static 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");
diff --git a/drivers/video/backlight/s6e63m0.c b/drivers/video/backlight/s6e63m0.c
index 322040f686c2..e1803ba23176 100644
--- a/drivers/video/backlight/s6e63m0.c
+++ b/drivers/video/backlight/s6e63m0.c
@@ -840,7 +840,7 @@ static int __devexit s6e63m0_remove(struct spi_device *spi)
 }
 
 #if defined(CONFIG_PM)
-unsigned int before_power;
+static unsigned int before_power;
 
 static int s6e63m0_suspend(struct spi_device *spi, pm_message_t mesg)
 {