Donate to e Foundation | Murena handsets with /e/OS | Own a part of Murena! Learn more

Commit 5ba73631 authored by David Dajun Chen's avatar David Dajun Chen Committed by Linus Torvalds
Browse files

leds: driver for DA9052/53 PMIC v2 



LED Driver for Dialog Semiconductor DA9052/53 PMICs.

[akpm@linux-foundation.org: make led_reg static]
Signed-off-by: default avatarDavid Dajun Chen <dchen@diasemi.com>
Signed-off-by: default avatarAshish Jangam <ashish.jangam@kpitcummins.com>
Reviewed-by: default avatarLars-Peter Clausen <lars@metafoo.de>
Cc: Richard Purdie <rpurdie@rpsys.net>
Cc: Bryan Wu <bryan.wu@canonical.com>
Signed-off-by: default avatarAndrew Morton <akpm@linux-foundation.org>
Signed-off-by: default avatarLinus Torvalds <torvalds@linux-foundation.org>
parent 5bc9ad77

drivers/leds/Kconfig

+8 −0
Original line number Diff line number Diff line
@@ -259,6 +259,14 @@ config LEDS_DA903X 
	  This option enables support for on-chip LED drivers found

	  on Dialog Semiconductor DA9030/DA9034 PMICs.



config LEDS_DA9052

	tristate "Dialog DA9052/DA9053 LEDS"

	depends on LEDS_CLASS

	depends on PMIC_DA9052

	help

	  This option enables support for on-chip LED drivers found

	  on Dialog Semiconductor DA9052-BC and DA9053-AA/Bx PMICs.



config LEDS_DAC124S085

	tristate "LED Support for DAC124S085 SPI DAC"

	depends on LEDS_CLASS

drivers/leds/Makefile

+1 −0
Original line number Diff line number Diff line
@@ -31,6 +31,7 @@ obj-$(CONFIG_LEDS_FSG) += leds-fsg.o 
obj-$(CONFIG_LEDS_PCA955X)		+= leds-pca955x.o

obj-$(CONFIG_LEDS_PCA9633)		+= leds-pca9633.o

obj-$(CONFIG_LEDS_DA903X)		+= leds-da903x.o

obj-$(CONFIG_LEDS_DA9052)		+= leds-da9052.o

obj-$(CONFIG_LEDS_WM831X_STATUS)	+= leds-wm831x-status.o

obj-$(CONFIG_LEDS_WM8350)		+= leds-wm8350.o

obj-$(CONFIG_LEDS_PWM)			+= leds-pwm.o

drivers/leds/leds-da9052.c

0 → 100644
+214 −0
Original line number Diff line number Diff line 
/*

 * LED Driver for Dialog DA9052 PMICs.

 *

 * Copyright(c) 2012 Dialog Semiconductor Ltd.

 *

 * Author: David Dajun Chen <dchen@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/module.h>

#include <linux/kernel.h>

#include <linux/init.h>

#include <linux/platform_device.h>

#include <linux/leds.h>

#include <linux/workqueue.h>

#include <linux/slab.h>



#include <linux/mfd/da9052/reg.h>

#include <linux/mfd/da9052/da9052.h>

#include <linux/mfd/da9052/pdata.h>



#define DA9052_OPENDRAIN_OUTPUT	2

#define DA9052_SET_HIGH_LVL_OUTPUT	(1 << 3)

#define DA9052_MASK_UPPER_NIBBLE	0xF0

#define DA9052_MASK_LOWER_NIBBLE	0x0F

#define DA9052_NIBBLE_SHIFT		4

#define DA9052_MAX_BRIGHTNESS		0x5f



struct da9052_led {

	struct led_classdev cdev;

	struct work_struct work;

	struct da9052 *da9052;

	unsigned char led_index;

	unsigned char id;

	int brightness;

};



static unsigned char led_reg[] = {

	DA9052_LED_CONT_4_REG,

	DA9052_LED_CONT_5_REG,

};



static int da9052_set_led_brightness(struct da9052_led *led)

{

	u8 val;

	int error;



	val = (led->brightness & 0x7f) | DA9052_LED_CONT_DIM;



	error = da9052_reg_write(led->da9052, led_reg[led->led_index], val);

	if (error < 0)

		dev_err(led->da9052->dev, "Failed to set led brightness, %d\n",

			error);

	return error;

}



static void da9052_led_work(struct work_struct *work)

{

	struct da9052_led *led = container_of(work, struct da9052_led, work);



	da9052_set_led_brightness(led);

}



static void da9052_led_set(struct led_classdev *led_cdev,

			   enum led_brightness value)

{

	struct da9052_led *led;



	led = container_of(led_cdev, struct da9052_led, cdev);

	led->brightness = value;

	schedule_work(&led->work);

}



static int da9052_configure_leds(struct da9052 *da9052)

{

	int error;

	unsigned char register_value = DA9052_OPENDRAIN_OUTPUT

				       | DA9052_SET_HIGH_LVL_OUTPUT;



	error = da9052_reg_update(da9052, DA9052_GPIO_14_15_REG,

				  DA9052_MASK_LOWER_NIBBLE,

				  register_value);



	if (error < 0) {

		dev_err(da9052->dev, "Failed to write GPIO 14-15 reg, %d\n",

			error);

		return error;

	}



	error = da9052_reg_update(da9052, DA9052_GPIO_14_15_REG,

				  DA9052_MASK_UPPER_NIBBLE,

				  register_value << DA9052_NIBBLE_SHIFT);

	if (error < 0)

		dev_err(da9052->dev, "Failed to write GPIO 14-15 reg, %d\n",

			error);



	return error;

}



static int __devinit da9052_led_probe(struct platform_device *pdev)

{

	struct da9052_pdata *pdata;

	struct da9052 *da9052;

	struct led_platform_data *pled;

	struct da9052_led *led = NULL;

	int error = -ENODEV;

	int i;



	da9052 = dev_get_drvdata(pdev->dev.parent);

	pdata = da9052->dev->platform_data;

	if (pdata == NULL) {

		dev_err(&pdev->dev, "No platform data\n");

		goto err;

	}



	pled = pdata->pled;

	if (pled == NULL) {

		dev_err(&pdev->dev, "No platform data for LED\n");

		goto err;

	}



	led = devm_kzalloc(&pdev->dev,

			   sizeof(struct da9052_led) * pled->num_leds,

			   GFP_KERNEL);

	if (led == NULL) {

		dev_err(&pdev->dev, "Failed to alloc memory\n");

		error = -ENOMEM;

		goto err;

	}



	for (i = 0; i < pled->num_leds; i++) {

		led[i].cdev.name = pled->leds[i].name;

		led[i].cdev.brightness_set = da9052_led_set;

		led[i].cdev.brightness = LED_OFF;

		led[i].cdev.max_brightness = DA9052_MAX_BRIGHTNESS;

		led[i].brightness = LED_OFF;

		led[i].led_index = pled->leds[i].flags;

		led[i].da9052 = dev_get_drvdata(pdev->dev.parent);

		INIT_WORK(&led[i].work, da9052_led_work);



		error = led_classdev_register(pdev->dev.parent, &led[i].cdev);

		if (error) {

			dev_err(&pdev->dev, "Failed to register led %d\n",

				led[i].led_index);

			goto err_register;

		}



		error = da9052_set_led_brightness(&led[i]);

		if (error) {

			dev_err(&pdev->dev, "Unable to init led %d\n",

				led[i].led_index);

			continue;

		}

	}

	error = da9052_configure_leds(led->da9052);

	if (error) {

		dev_err(&pdev->dev, "Failed to configure GPIO LED%d\n", error);

		goto err_register;

	}



	platform_set_drvdata(pdev, led);



	return 0;



err_register:

	for (i = i - 1; i >= 0; i--) {

		led_classdev_unregister(&led[i].cdev);

		cancel_work_sync(&led[i].work);

	}

err:

	return error;

}



static int __devexit da9052_led_remove(struct platform_device *pdev)

{

	struct da9052_led *led = platform_get_drvdata(pdev);

	struct da9052_pdata *pdata;

	struct da9052 *da9052;

	struct led_platform_data *pled;

	int i;



	da9052 = dev_get_drvdata(pdev->dev.parent);

	pdata = da9052->dev->platform_data;

	pled = pdata->pled;



	for (i = 0; i < pled->num_leds; i++) {

		led[i].brightness = 0;

		da9052_set_led_brightness(&led[i]);

		led_classdev_unregister(&led[i].cdev);

		cancel_work_sync(&led[i].work);

	}



	return 0;

}



static struct platform_driver da9052_led_driver = {

	.driver		= {

		.name	= "da9052-leds",

		.owner	= THIS_MODULE,

	},

	.probe		= da9052_led_probe,

	.remove		= __devexit_p(da9052_led_remove),

};



module_platform_driver(da9052_led_driver);



MODULE_AUTHOR("Dialog Semiconductor Ltd <dchen@diasemi.com>");

MODULE_DESCRIPTION("LED driver for Dialog DA9052 PMIC");

MODULE_LICENSE("GPL");