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Subject[PATCH V2] backlight: add ams369fg06 amoled driver
Date
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;
+
+ 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@samsung.com>");
+MODULE_DESCRIPTION("ams369fg06 LCD Driver");
+MODULE_LICENSE("GPL");
--
1.7.1


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