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/* Copyright (c) 2013, The Linux Foundation. All rights reserved.
*
* This program is free software; you can redistribute it and/or modify
* it under the terms of the GNU General Public License version 2 and
* only version 2 as published by the Free Software Foundation.
*
* This program is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
* GNU General Public License for more details.
*/
#include <linux/kernel.h>
#include <linux/module.h>
#include <linux/init.h>
#include <linux/leds.h>
#include <linux/platform_device.h>
#include <linux/of_gpio.h>
#include <linux/gpio.h>
#include <linux/of.h>
#include <linux/printk.h>
#define LED_GPIO_FLASH_DRIVER_NAME "qcom,leds-gpio-flash"
#define LED_TRIGGER_DEFAULT "none"
struct led_gpio_flash_data {
int flash_en;
int flash_now;
int brightness;
struct led_classdev cdev;
};
static struct of_device_id led_gpio_flash_of_match[] = {
{.compatible = LED_GPIO_FLASH_DRIVER_NAME,},
{},
};
static void led_gpio_brightness_set(struct led_classdev *led_cdev,
enum led_brightness value)
{
int rc = 0;
struct led_gpio_flash_data *flash_led =
container_of(led_cdev, struct led_gpio_flash_data, cdev);
int brightness = value;
int flash_en = 0, flash_now = 0;
if (brightness > LED_HALF) {
flash_en = 0;
flash_now = 1;
} else if (brightness > LED_OFF) {
flash_en = 1;
flash_now = 0;
} else {
flash_en = 0;
flash_now = 0;
}
rc = gpio_direction_output(flash_led->flash_en, flash_en);
if (rc) {
pr_err("%s: Failed to set gpio %d\n", __func__,
flash_led->flash_en);
goto err;
}
rc = gpio_direction_output(flash_led->flash_now, flash_now);
if (rc) {
pr_err("%s: Failed to set gpio %d\n", __func__,
flash_led->flash_now);
goto err;
}
flash_led->brightness = brightness;
err:
return;
}
static enum led_brightness led_gpio_brightness_get(struct led_classdev
*led_cdev)
{
struct led_gpio_flash_data *flash_led =
container_of(led_cdev, struct led_gpio_flash_data, cdev);
return flash_led->brightness;
}
int led_gpio_flash_probe(struct platform_device *pdev)
{
int rc = 0;
const char *temp_str;
struct led_gpio_flash_data *flash_led = NULL;
struct device_node *node = pdev->dev.of_node;
flash_led = devm_kzalloc(&pdev->dev, sizeof(struct led_gpio_flash_data),
GFP_KERNEL);
if (flash_led == NULL) {
dev_err(&pdev->dev, "%s:%d Unable to allocate memory\n",
__func__, __LINE__);
return -ENOMEM;
}
flash_led->cdev.default_trigger = LED_TRIGGER_DEFAULT;
rc = of_property_read_string(node, "linux,default-trigger", &temp_str);
if (!rc)
flash_led->cdev.default_trigger = temp_str;
flash_led->flash_en = of_get_named_gpio(node, "qcom,flash-en", 0);
if (flash_led->flash_en < 0) {
dev_err(&pdev->dev,
"Looking up %s property in node %s failed. rc = %d\n",
"flash-en", node->full_name, flash_led->flash_en);
goto error;
} else {
rc = gpio_request(flash_led->flash_en, "FLASH_EN");
if (rc) {
dev_err(&pdev->dev,
"%s: Failed to request gpio %d,rc = %d\n",
__func__, flash_led->flash_en, rc);
goto error;
}
}
flash_led->flash_now = of_get_named_gpio(node, "qcom,flash-now", 0);
if (flash_led->flash_now < 0) {
dev_err(&pdev->dev,
"Looking up %s property in node %s failed. rc = %d\n",
"flash-now", node->full_name, flash_led->flash_now);
goto error;
} else {
rc = gpio_request(flash_led->flash_now, "FLASH_NOW");
if (rc) {
dev_err(&pdev->dev,
"%s: Failed to request gpio %d,rc = %d\n",
__func__, flash_led->flash_now, rc);
goto error;
}
}
gpio_tlmm_config(GPIO_CFG(flash_led->flash_en, 0,
GPIO_CFG_OUTPUT, GPIO_CFG_NO_PULL,
GPIO_CFG_2MA), GPIO_CFG_ENABLE);
gpio_tlmm_config(GPIO_CFG(flash_led->flash_now, 0,
GPIO_CFG_OUTPUT, GPIO_CFG_NO_PULL,
GPIO_CFG_2MA), GPIO_CFG_ENABLE);
rc = of_property_read_string(node, "linux,name", &flash_led->cdev.name);
if (rc) {
dev_err(&pdev->dev, "%s: Failed to read linux name. rc = %d\n",
__func__, rc);
goto error;
}
platform_set_drvdata(pdev, flash_led);
flash_led->cdev.max_brightness = LED_FULL;
flash_led->cdev.brightness_set = led_gpio_brightness_set;
flash_led->cdev.brightness_get = led_gpio_brightness_get;
rc = led_classdev_register(&pdev->dev, &flash_led->cdev);
if (rc) {
dev_err(&pdev->dev, "%s: Failed to register led dev. rc = %d\n",
__func__, rc);
goto error;
}
return 0;
error:
devm_kfree(&pdev->dev, flash_led);
return rc;
}
int led_gpio_flash_remove(struct platform_device *pdev)
{
struct led_gpio_flash_data *flash_led =
(struct led_gpio_flash_data *)platform_get_drvdata(pdev);
led_classdev_unregister(&flash_led->cdev);
devm_kfree(&pdev->dev, flash_led);
return 0;
}
static struct platform_driver led_gpio_flash_driver = {
.probe = led_gpio_flash_probe,
.remove = led_gpio_flash_remove,
.driver = {
.name = LED_GPIO_FLASH_DRIVER_NAME,
.owner = THIS_MODULE,
.of_match_table = led_gpio_flash_of_match,
}
};
static int __init led_gpio_flash_init(void)
{
return platform_driver_register(&led_gpio_flash_driver);
}
static void __exit led_gpio_flash_exit(void)
{
return platform_driver_unregister(&led_gpio_flash_driver);
}
late_initcall(led_gpio_flash_init);
module_exit(led_gpio_flash_exit);
MODULE_DESCRIPTION("QCOM GPIO LEDs driver");
MODULE_LICENSE("GPL v2");
MODULE_ALIAS("leds:leds-msm-gpio-flash");
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