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    Subject[PATCH] LEDS: LED module for DA9052/53 PMIC v2
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    LED Driver for Dialog Semiconductor DA9052/53 PMICs.

    Signed-off-by: David Dajun Chen <dchen@diasemi.com>
    Signed-off-by: Ashish Jangam <ashish.jangam@kpitcummins.com>
    ---
    drivers/leds/Kconfig | 8 ++
    drivers/leds/Makefile | 1 +
    drivers/leds/leds-da9052.c | 214 ++++++++++++++++++++++++++++++++++++++++++++
    3 files changed, 223 insertions(+), 0 deletions(-)
    create mode 100644 drivers/leds/leds-da9052.c

    diff --git a/drivers/leds/Kconfig b/drivers/leds/Kconfig
    index e2ac190..b826f88 100644
    --- a/drivers/leds/Kconfig
    +++ b/drivers/leds/Kconfig
    @@ -266,6 +266,14 @@ 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
    diff --git a/drivers/leds/Makefile b/drivers/leds/Makefile
    index fa0f428..479048f 100644
    --- a/drivers/leds/Makefile
    +++ b/drivers/leds/Makefile
    @@ -32,6 +32,7 @@ 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
    diff --git a/drivers/leds/leds-da9052.c b/drivers/leds/leds-da9052.c
    new file mode 100644
    index 0000000..15281b4
    --- /dev/null
    +++ b/drivers/leds/leds-da9052.c
    @@ -0,0 +1,214 @@
    +/*
    + * 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;
    +};
    +
    +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");



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