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/*
* 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 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 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 = 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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