PMIC: Add Video Backlight Driver for Dialog DA9052

Add DA9052 video backlight driver from Dialog.
Modify Kconfig/Makefile for DA9052 video backlight driver.

Signed-off-by: Zhou Jingyu <Jingyu.Zhou@freescale.com>
Acked-by: Lily Zhang <r58066@freescale.com>
Signed-off-by: Ying-Chun Liu (PaulLiu) <paul.liu@linaro.org>

3 files changed, 468 insertions, 0 deletions

diff --git a/drivers/video/backlight/Kconfig b/drivers/video/backlight/Kconfig
index 278aeaa9250..cc795c014e0 100644
--- a/drivers/video/backlight/Kconfig
+++ b/drivers/video/backlight/Kconfig
@@ -342,6 +342,12 @@ config BACKLIGHT_AAT2870
 	  If you have a AnalogicTech AAT2870 say Y to enable the
 	  backlight driver.
 
+config BACKLIGHT_DA9052
+	tristate "Dialog DA9052 WLED"
+	depends on PMIC_DIALOG
+	help
+	  Enable the DA9052 Backlight Driver
+
 endif # BACKLIGHT_CLASS_DEVICE
 
 endif # BACKLIGHT_LCD_SUPPORT
diff --git a/drivers/video/backlight/Makefile b/drivers/video/backlight/Makefile
index fdd1fc4b277..aea6797661d 100644
--- a/drivers/video/backlight/Makefile
+++ b/drivers/video/backlight/Makefile
@@ -39,4 +39,5 @@ obj-$(CONFIG_BACKLIGHT_ADP8870)	+= adp8870_bl.o
 obj-$(CONFIG_BACKLIGHT_88PM860X) += 88pm860x_bl.o
 obj-$(CONFIG_BACKLIGHT_PCF50633)	+= pcf50633-backlight.o
 obj-$(CONFIG_BACKLIGHT_AAT2870) += aat2870_bl.o
+obj-$(CONFIG_BACKLIGHT_DA9052)	+= da9052_bl.o
 
diff --git a/drivers/video/backlight/da9052_bl.c b/drivers/video/backlight/da9052_bl.c
new file mode 100644
index 00000000000..0692194b4e6
--- /dev/null
+++ b/drivers/video/backlight/da9052_bl.c
@@ -0,0 +1,461 @@
+/*
+ * Copyright(c) 2009 Dialog Semiconductor Ltd.
+ *
+ * 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.
+ *
+ * da9052_bl.c: Backlight driver for DA9052
+ */
+
+#include <linux/platform_device.h>
+#include <linux/fb.h>
+#include <linux/backlight.h>
+
+#include <linux/delay.h>
+
+#include <linux/mfd/da9052/da9052.h>
+#include <linux/mfd/da9052/reg.h>
+#include <linux/mfd/da9052/bl.h>
+
+
+#define DRIVER_NAME		"da9052-backlight"
+#define DRIVER_NAME1		"WLED-1"
+#define DRIVER_NAME2		"WLED-2"
+#define DRIVER_NAME3		"WLED-3"
+
+/* These flags define if Backlight LEDs are present */
+/* Set the following macros to 1, if LEDs are present. Otherwise set to 0 */
+#define DA9052_LED1_PRESENT	1
+#define DA9052_LED2_PRESENT	1
+#define DA9052_LED3_PRESENT	1
+
+#define DA9052_MAX_BRIGHTNESS	0xFF
+
+struct da9052_backlight_data {
+	struct device *da9052_dev;
+	int current_brightness;
+	struct da9052 *da9052;
+
+	int is_led1_present;
+	int is_led2_present;
+	int is_led3_present;
+};
+
+enum da9052_led_number {
+	LED1 = 1,
+	LED2,
+	LED3,
+};
+
+static int da9052_backlight_brightness_set(struct da9052_backlight_data *data,
+			int brightness, enum da9052_led_number led)
+{
+	/*
+	 * Mechanism for brightness control:
+	 * For brightness control, current is used.
+	 * PWM feature is not used.
+	 * To use PWM feature, a fixed value of current should be defined.
+	 */
+
+	int ret = 0;
+	unsigned int led_ramp_bit;
+	unsigned int led_current_register;
+	unsigned int led_current_sink_bit;
+	unsigned int led_boost_en_bit;
+	struct da9052_ssc_msg msg;
+
+	switch (led) {
+	case LED1:
+		led_ramp_bit = DA9052_LEDCONT_LED1RAMP;
+		led_current_register = DA9052_LED1CONF_REG;
+		led_current_sink_bit = DA9052_LEDCONT_LED1EN;
+		led_boost_en_bit = DA9052_BOOST_LED1INEN;
+	break;
+	case LED2:
+		led_ramp_bit = DA9052_LEDCONT_LED2RAMP;
+		led_current_register = DA9052_LED2CONF_REG;
+		led_current_sink_bit = DA9052_LEDCONT_LED2EN;
+		led_boost_en_bit = DA9052_BOOST_LED2INEN;
+	break;
+	case LED3:
+		led_ramp_bit = DA9052_LEDCONT_LED3RAMP;
+		led_current_register = DA9052_LED3CONF_REG;
+		led_current_sink_bit = DA9052_LEDCONT_LED3EN;
+		led_boost_en_bit = DA9052_BOOST_LED3INEN;
+	break;
+	default:
+		return -EIO;
+	}
+
+	/*
+		1. Configure the boost register
+		2. Configure the LED _CONT register
+		3. Configure the LEDx_CONF registers to the brightness value.
+	*/
+	msg.addr = DA9052_BOOST_REG;
+	msg.data = 0x3F;
+	if (brightness) {
+		da9052_lock(data->da9052);
+		ret = data->da9052->write(data->da9052, &msg);
+		if (ret) {
+			da9052_unlock(data->da9052);
+			return ret;
+		}
+		da9052_unlock(data->da9052);
+	}
+
+	msg.addr = DA9052_LEDCONT_REG;
+	msg.data = 0xFF;
+	if (brightness) {
+		da9052_lock(data->da9052);
+		ret = data->da9052->write(data->da9052, &msg);
+		if (ret) {
+			da9052_unlock(data->da9052);
+			return ret;
+		}
+		da9052_unlock(data->da9052);
+	}
+
+	msg.addr = led_current_register;
+	msg.data = 0;
+	/* Write to the DA9052 register */
+	da9052_lock(data->da9052);
+	ret = data->da9052->write(data->da9052, &msg);
+	if (ret) {
+		da9052_unlock(data->da9052);
+		return ret;
+	}
+	da9052_unlock(data->da9052);
+	msleep(20);
+	msg.data = brightness;
+	/* Write to the DA9052 register */
+	da9052_lock(data->da9052);
+	ret = data->da9052->write(data->da9052, &msg);
+	if (ret) {
+		da9052_unlock(data->da9052);
+		return ret;
+	}
+	da9052_unlock(data->da9052);
+
+	return 0;
+}
+
+static int da9052_backlight_set(struct backlight_device *bl, int brightness)
+{
+	struct da9052_backlight_data *data = bl_get_data(bl);
+	int ret = 0;
+	/* Check for LED1 */
+	if (1 == data->is_led1_present) {
+		ret = da9052_backlight_brightness_set(data, brightness, LED1);
+		if (ret)
+			return ret;
+	}
+	/* Check for LED2 */
+	if (1 == data->is_led2_present) {
+		ret = da9052_backlight_brightness_set(data, brightness, LED2);
+		if (ret)
+			return ret;
+	}
+	/* Check for LED3 */
+	if (1 == data->is_led3_present) {
+		ret = da9052_backlight_brightness_set(data, brightness, LED3);
+		if (ret)
+			return ret;
+	}
+
+	data->current_brightness = brightness;
+	return 0;
+}
+
+static int da9052_init_WLED(struct da9052_backlight_data *data,
+			enum da9052_led_number led)
+{
+	int ret = 0;
+	unsigned int led_current_register;
+	struct da9052_ssc_msg msg;
+
+	switch (led) {
+	case LED1:
+		led_current_register = DA9052_LED1CONF_REG;
+	break;
+	case LED2:
+		led_current_register = DA9052_LED2CONF_REG;
+	break;
+	case LED3:
+		led_current_register = DA9052_LED3CONF_REG;
+	break;
+	default:
+		return -EIO;
+	}
+
+	msg.addr = DA9052_BOOST_REG;
+	msg.data = 0x00;
+	da9052_lock(data->da9052);
+	ret = data->da9052->write(data->da9052, &msg);
+	if (ret) {
+		da9052_unlock(data->da9052);
+		return ret;
+	}
+	da9052_unlock(data->da9052);
+
+	msg.addr = DA9052_LEDCONT_REG;
+	msg.data = 0x00;
+	da9052_lock(data->da9052);
+	ret = data->da9052->write(data->da9052, &msg);
+	if (ret) {
+		da9052_unlock(data->da9052);
+		return ret;
+	}
+	da9052_unlock(data->da9052);
+
+	msg.addr = led_current_register;
+	msg.data = 0;
+	da9052_lock(data->da9052);
+	ret = data->da9052->write(data->da9052, &msg);
+	da9052_unlock(data->da9052);
+	return ret;
+}
+
+static int da9052_backlight_update_status(struct backlight_device *bl)
+{
+	int brightness = bl->props.brightness;
+
+	if (bl->props.power != FB_BLANK_UNBLANK)
+		brightness = 0;
+
+	if (bl->props.fb_blank != FB_BLANK_UNBLANK)
+		brightness = 0;
+	return da9052_backlight_set(bl, brightness);
+}
+
+static int da9052_backlight_get_brightness(struct backlight_device *bl)
+{
+	struct da9052_backlight_data *data = bl_get_data(bl);
+	return data->current_brightness;
+}
+
+const struct backlight_ops da9052_backlight_ops = {
+	.update_status	= da9052_backlight_update_status,
+	.get_brightness	= da9052_backlight_get_brightness,
+};
+
+static int da9052_backlight_probe1(struct platform_device *pdev)
+{
+	struct da9052_backlight_data *data;
+	struct backlight_device *bl;
+	struct backlight_properties props;
+	int ret = 0;
+	struct da9052 *da9052 = dev_get_drvdata(pdev->dev.parent);
+
+	data = kzalloc(sizeof(*data), GFP_KERNEL);
+	if (data == NULL)
+		return -ENOMEM;
+	data->da9052_dev = pdev->dev.parent;
+	data->da9052	= da9052;
+	data->current_brightness = 0;
+	data->is_led1_present = DA9052_LED1_PRESENT;
+
+	/* Init the WLED-1 bank */
+	ret = da9052_init_WLED(data, LED1);
+	if (ret)
+		return ret;
+
+	memset(&props, 0, sizeof(struct backlight_properties));
+	props.max_brightness = DA9052_MAX_BRIGHTNESS;
+	bl = backlight_device_register(pdev->name, data->da9052_dev,
+				       data, &da9052_backlight_ops, &props);
+	if (IS_ERR(bl)) {
+		dev_err(&pdev->dev, "failed to register backlight\n");
+		kfree(data);
+		return PTR_ERR(bl);
+	}
+
+	bl->props.brightness = 0;
+
+	platform_set_drvdata(pdev, bl);
+	backlight_update_status(bl);
+
+	return 0;
+}
+static int da9052_backlight_probe2(struct platform_device *pdev)
+{
+	struct da9052_backlight_data *data;
+	struct backlight_device *bl;
+	struct da9052 *da9052 = dev_get_drvdata(pdev->dev.parent);
+	struct backlight_properties props;
+	int ret = 0;
+
+	data = kzalloc(sizeof(*data), GFP_KERNEL);
+	if (data == NULL)
+		return -ENOMEM;
+	data->da9052_dev = pdev->dev.parent;
+	data->da9052	= da9052;
+	data->current_brightness = 0;
+	data->is_led2_present = DA9052_LED2_PRESENT;
+
+	/* Init the WLED-2 bank */
+	ret = da9052_init_WLED(data, LED2);
+	if (ret)
+		return ret;
+
+	memset(&props, 0, sizeof(struct backlight_properties));
+	props.max_brightness = DA9052_MAX_BRIGHTNESS;
+	bl = backlight_device_register(pdev->name, data->da9052_dev,
+				       data, &da9052_backlight_ops, &props);
+	if (IS_ERR(bl)) {
+		dev_err(&pdev->dev, "failed to register backlight\n");
+		kfree(data);
+		return PTR_ERR(bl);
+	}
+
+	bl->props.brightness = 0;
+
+	platform_set_drvdata(pdev, bl);
+	backlight_update_status(bl);
+
+	return 0;
+}
+static int da9052_backlight_probe3(struct platform_device *pdev)
+{
+	struct da9052_backlight_data *data;
+	struct backlight_device *bl;
+	struct da9052 *da9052 = dev_get_drvdata(pdev->dev.parent);
+	struct backlight_properties props;
+	int ret = 0;
+
+	data = kzalloc(sizeof(*data), GFP_KERNEL);
+	if (data == NULL)
+		return -ENOMEM;
+	data->da9052_dev = pdev->dev.parent;
+	data->da9052	= da9052;
+	data->current_brightness = 0;
+	data->is_led3_present = DA9052_LED3_PRESENT;
+
+	/* Init the WLED-2 bank */
+	ret = da9052_init_WLED(data, LED3);
+	if (ret)
+		return ret;
+
+	memset(&props, 0, sizeof(struct backlight_properties));
+	props.max_brightness = DA9052_MAX_BRIGHTNESS;
+	bl = backlight_device_register(pdev->name, data->da9052_dev,
+				       data, &da9052_backlight_ops, &props);
+	if (IS_ERR(bl)) {
+		dev_err(&pdev->dev, "failed to register backlight\n");
+		kfree(data);
+		return PTR_ERR(bl);
+	}
+
+	bl->props.brightness = 0;
+
+	platform_set_drvdata(pdev, bl);
+
+	backlight_update_status(bl);
+	return 0;
+}
+
+static int da9052_backlight_remove1(struct platform_device *pdev)
+{
+	struct backlight_device *bl = platform_get_drvdata(pdev);
+	struct da9052_backlight_data *data = bl_get_data(bl);
+	int ret = 0;
+
+	/* Switch off the WLED-1 */
+	ret = da9052_init_WLED(data, LED1);
+	if (ret)
+		return ret;
+
+	backlight_device_unregister(bl);
+	kfree(data);
+	return 0;
+}
+
+static int da9052_backlight_remove2(struct platform_device *pdev)
+{
+	struct backlight_device *bl = platform_get_drvdata(pdev);
+	struct da9052_backlight_data *data = bl_get_data(bl);
+	int ret = 0;
+
+	/* Switch off the WLED-2 */
+	ret = da9052_init_WLED(data, LED2);
+	if (ret)
+		return ret;
+
+	backlight_device_unregister(bl);
+	kfree(data);
+	return 0;
+}
+static int da9052_backlight_remove3(struct platform_device *pdev)
+{
+	struct backlight_device *bl = platform_get_drvdata(pdev);
+	struct da9052_backlight_data *data = bl_get_data(bl);
+	int ret;
+
+	/* Switch off the WLED-3 */
+	ret = da9052_init_WLED(data, LED3);
+	if (ret)
+		return ret;
+
+	backlight_device_unregister(bl);
+	kfree(data);
+	return 0;
+}
+
+static struct platform_driver da9052_backlight_driver1 = {
+	.driver		= {
+		.name	= DRIVER_NAME1,
+		.owner	= THIS_MODULE,
+	},
+	.probe		= da9052_backlight_probe1,
+	.remove		= da9052_backlight_remove1,
+};
+static struct platform_driver da9052_backlight_driver2 = {
+	.driver		= {
+		.name	= DRIVER_NAME2,
+		.owner	= THIS_MODULE,
+	},
+	.probe		= da9052_backlight_probe2,
+	.remove		= da9052_backlight_remove2,
+};
+static struct platform_driver da9052_backlight_driver3 = {
+	.driver		= {
+		.name	= DRIVER_NAME3,
+		.owner	= THIS_MODULE,
+	},
+	.probe		= da9052_backlight_probe3,
+	.remove		= da9052_backlight_remove3,
+};
+
+static int __init da9052_backlight_init(void)
+{
+	s32 ret;
+	ret = platform_driver_register(&da9052_backlight_driver1);
+	if (ret)
+		return ret;
+	ret = platform_driver_register(&da9052_backlight_driver2);
+	if (ret)
+		return ret;
+
+	ret = platform_driver_register(&da9052_backlight_driver3);
+	if (ret)
+		return ret;
+
+	return ret;
+}
+module_init(da9052_backlight_init);
+
+static void __exit da9052_backlight_exit(void)
+{
+	platform_driver_unregister(&da9052_backlight_driver1);
+	platform_driver_unregister(&da9052_backlight_driver2);
+	platform_driver_unregister(&da9052_backlight_driver3);
+}
+module_exit(da9052_backlight_exit);
+
+MODULE_AUTHOR("Dialog Semiconductor Ltd <dchen@diasemi.com>");
+MODULE_DESCRIPTION("Backlight driver for Dialog DA9052 PMIC");
+MODULE_LICENSE("GPL v2");
+MODULE_ALIAS("platform:" DRIVER_NAME);
+