Message-Id: <1309329424-21748-1-git-send-email-jg1.han@samsung.com>
Date:	Wed, 29 Jun 2011 15:37:04 +0900
From:	Jingoo Han <jg1.han@...sung.com>
To:	Andrew Morton <akpm@...ux-foundation.org>,
	LKML <linux-kernel@...r.kernel.org>
Cc:	Richard Purdie <rpurdie@...ys.net>,
	Inki Dae <inki.dae@...sung.com>,
	Jingoo Han <jg1.han@...sung.com>
Subject: [PATCH V2] backlight: add ams369fg06 amoled driver

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@...sung.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@...sung.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 __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@...sung.com>");
+MODULE_DESCRIPTION("ams369fg06 LCD Driver");
+MODULE_LICENSE("GPL");
-- 
1.7.1

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