[PATCH 04/07] Backlight: Backlight module for DA9052/53 PMIC v1

Ashish Jangam ashish.jangam at kpitcummins.com
Tue Mar 13 12:28:13 UTC 2012


Any update on below patch?
On Mon, 2012-02-06 at 18:16 +0530, Ashish Jangam wrote:
> DA9052/53 PMIC has capability to supply power for upto 3 banks of 6
> white serial LEDS. It can also control intensity of independent banks
> and to drive these banks boost converter will provide up to 24V and
> forward current of max. 50mA.
> 
> This patch allows to control intensity of the individual WLEDs bank
> through DA9052/53 PMIC.
> 
> This patch is functionally tested on Samsung SMDKV6410.
> 
> Signed-off-by: David Dajun Chen <dchen at diasemi.com>
> Signed-off-by: Ashish Jangam <ashish.jangam at kpitcummins.com>
> ---
>  drivers/video/backlight/Kconfig     |    6 +
>  drivers/video/backlight/Makefile    |    1 +
>  drivers/video/backlight/da9052_bl.c |  187 +++++++++++++++++++++++++++++++++++
>  3 files changed, 194 insertions(+), 0 deletions(-)
>  create mode 100644 drivers/video/backlight/da9052_bl.c
> diff --git a/drivers/video/backlight/Kconfig b/drivers/video/backlight/Kconfig
> index 49e7d83..77a3942 100644
> --- a/drivers/video/backlight/Kconfig
> +++ b/drivers/video/backlight/Kconfig
> @@ -245,6 +245,12 @@ config BACKLIGHT_DA903X
>  	  If you have a LCD backlight connected to the WLED output of DA9030
>  	  or DA9034 WLED output, say Y here to enable this driver.
>  
> +config BACKLIGHT_DA9052
> +	tristate "Dialog DA9052/DA9053 WLED"
> +	depends on PMIC_DA9052
> +	help
> +	  Enable the Backlight Driver for DA9052-BC and DA9053-AA/Bx PMICs.
> +
>  config BACKLIGHT_MAX8925
>  	tristate "Backlight driver for MAX8925"
>  	depends on MFD_MAX8925
> diff --git a/drivers/video/backlight/Makefile b/drivers/video/backlight/Makefile
> index 0ee06e0..6622f34 100644
> --- a/drivers/video/backlight/Makefile
> +++ b/drivers/video/backlight/Makefile
> @@ -28,6 +28,7 @@ obj-$(CONFIG_BACKLIGHT_PROGEAR) += progear_bl.o
>  obj-$(CONFIG_BACKLIGHT_CARILLO_RANCH) += cr_bllcd.o
>  obj-$(CONFIG_BACKLIGHT_PWM)	+= pwm_bl.o
>  obj-$(CONFIG_BACKLIGHT_DA903X)	+= da903x_bl.o
> +obj-$(CONFIG_BACKLIGHT_DA9052)	+= da9052_bl.o
>  obj-$(CONFIG_BACKLIGHT_MAX8925)	+= max8925_bl.o
>  obj-$(CONFIG_BACKLIGHT_APPLE)	+= apple_bl.o
>  obj-$(CONFIG_BACKLIGHT_TOSA)	+= tosa_bl.o
> diff --git a/drivers/video/backlight/da9052_bl.c b/drivers/video/backlight/da9052_bl.c
> new file mode 100644
> index 0000000..b628d68
> --- /dev/null
> +++ b/drivers/video/backlight/da9052_bl.c
> @@ -0,0 +1,187 @@
> +/*
> + * Backlight Driver for Dialog DA9052 PMICs
> + *
> + * Copyright(c) 2012 Dialog Semiconductor Ltd.
> + *
> + * Author: David Dajun Chen <dchen at diasemi.com>
> + *
> + * 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.
> + *
> + */
> +
> +#include <linux/backlight.h>
> +#include <linux/delay.h>
> +#include <linux/fb.h>
> +#include <linux/module.h>
> +#include <linux/platform_device.h>
> +
> +#include <linux/mfd/da9052/da9052.h>
> +#include <linux/mfd/da9052/reg.h>
> +
> +#define DA9052_MAX_BRIGHTNESS		0xFF
> +
> +enum {
> +	DA9052_WLEDS_OFF,
> +	DA9052_WLEDS_ON,
> +};
> +
> +enum {
> +	DA9052_TYPE_WLED1,
> +	DA9052_TYPE_WLED2,
> +	DA9052_TYPE_WLED3,
> +};
> +
> +static unsigned char wled_bank[] = {
> +	DA9052_LED1_CONF_REG,
> +	DA9052_LED2_CONF_REG,
> +	DA9052_LED3_CONF_REG,
> +};
> +
> +struct da9052_bl {
> +	struct da9052 *da9052;
> +	uint brightness;
> +	uint state;
> +	uint led_reg;
> +};
> +
> +static int da9052_adjust_wled_brightness(struct da9052_bl *wleds)
> +{
> +	unsigned char boost_en;
> +	unsigned char i_sink;
> +	int ret;
> +
> +	boost_en = 0x3F;
> +	i_sink = 0xFF;
> +	if (wleds->state == DA9052_WLEDS_OFF) {
> +		boost_en = 0x00;
> +		i_sink = 0x00;
> +	}
> +
> +	ret = da9052_reg_write(wleds->da9052, DA9052_BOOST_REG, boost_en);
> +	if (ret < 0)
> +		return ret;
> +
> +	ret = da9052_reg_write(wleds->da9052, DA9052_LED_CONT_REG, i_sink);
> +	if (ret < 0)
> +		return ret;
> +
> +	ret = da9052_reg_write(wleds->da9052, wled_bank[wleds->led_reg], 0x0);
> +	if (ret < 0)
> +		return ret;
> +
> +	msleep(10);
> +
> +	if (wleds->brightness) {
> +		ret = da9052_reg_write(wleds->da9052, wled_bank[wleds->led_reg],
> +				       wleds->brightness);
> +		if (ret < 0)
> +			return ret;
> +	}
> +
> +	return 0;
> +}
> +
> +static int da9052_backlight_update_status(struct backlight_device *bl)
> +{
> +	int brightness = bl->props.brightness;
> +	struct da9052_bl *wleds = bl_get_data(bl);
> +
> +	wleds->brightness = brightness;
> +	wleds->state = DA9052_WLEDS_ON;
> +
> +	return da9052_adjust_wled_brightness(wleds);
> +}
> +
> +static int da9052_backlight_get_brightness(struct backlight_device *bl)
> +{
> +	struct da9052_bl *wleds = bl_get_data(bl);
> +
> +	return wleds->brightness;
> +}
> +
> +static const struct backlight_ops da9052_backlight_ops = {
> +	.update_status = da9052_backlight_update_status,
> +	.get_brightness = da9052_backlight_get_brightness,
> +};
> +
> +static int da9052_backlight_probe(struct platform_device *pdev)
> +{
> +	struct backlight_device *bl;
> +	struct backlight_properties props;
> +	struct da9052_bl *wleds;
> +
> +	wleds = devm_kzalloc(&pdev->dev, sizeof(struct da9052_bl), GFP_KERNEL);
> +	if (!wleds)
> +		return -ENOMEM;
> +
> +	wleds->da9052 = dev_get_drvdata(pdev->dev.parent);
> +	wleds->brightness = 0;
> +	wleds->led_reg = platform_get_device_id(pdev)->driver_data;
> +	wleds->state = DA9052_WLEDS_OFF;
> +
> +	props.type = BACKLIGHT_RAW;
> +	props.max_brightness = DA9052_MAX_BRIGHTNESS;
> +
> +	bl = backlight_device_register(pdev->name, wleds->da9052->dev, wleds,
> +				       &da9052_backlight_ops, &props);
> +	if (IS_ERR(bl)) {
> +		dev_err(&pdev->dev, "Failed to register backlight\n");
> +		devm_kfree(&pdev->dev, wleds);
> +		return PTR_ERR(bl);
> +	}
> +
> +	bl->props.max_brightness = DA9052_MAX_BRIGHTNESS;
> +	bl->props.brightness = 0;
> +	platform_set_drvdata(pdev, bl);
> +
> +	return da9052_adjust_wled_brightness(wleds);
> +}
> +
> +static int da9052_backlight_remove(struct platform_device *pdev)
> +{
> +	struct backlight_device *bl = platform_get_drvdata(pdev);
> +	struct da9052_bl *wleds = bl_get_data(bl);
> +
> +	wleds->brightness = 0;
> +	wleds->state = DA9052_WLEDS_OFF;
> +	da9052_adjust_wled_brightness(wleds);
> +	backlight_device_unregister(bl);
> +	devm_kfree(&pdev->dev, wleds);
> +
> +	return 0;
> +}
> +
> +static struct platform_device_id da9052_wled_ids[] = {
> +	{
> +		.name		= "da9052-wled1",
> +		.driver_data	= DA9052_TYPE_WLED1,
> +	},
> +	{
> +		.name		= "da9052-wled2",
> +		.driver_data	= DA9052_TYPE_WLED2,
> +	},
> +	{
> +		.name		= "da9052-wled3",
> +		.driver_data	= DA9052_TYPE_WLED3,
> +	},
> +};
> +
> +static struct platform_driver da9052_wled_driver = {
> +	.probe		= da9052_backlight_probe,
> +	.remove		= da9052_backlight_remove,
> +	.id_table	= da9052_wled_ids,
> +	.driver	= {
> +		.name	= "da9052-wled",
> +		.owner	= THIS_MODULE,
> +	},
> +};
> +
> +module_platform_driver(da9052_wled_driver);
> +
> +MODULE_AUTHOR("David Dajun Chen <dchen at diasemi.com>");
> +MODULE_DESCRIPTION("Backlight driver for DA9052 PMIC");
> +MODULE_LICENSE("GPL");
> +MODULE_ALIAS("platform:da9052-backlight");
> 





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