--- /dev/null
+/*
+ * drivers/amlogic/led/led_sys.c
+ *
+ * Copyright (C) 2017 Amlogic, Inc. 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 as published by
+ * the Free Software Foundation; either version 2 of the License, or
+ * (at your option) any later version.
+ *
+ * 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.
+ *
+ */
+
+#define pr_fmt(fmt) "sysled: " fmt
+
+#include <linux/init.h>
+#include <linux/kernel.h>
+#include <linux/module.h>
+#include <linux/platform_device.h>
+#include <linux/of.h>
+#include <linux/of_gpio.h>
+#include <linux/leds.h>
+#include <linux/gpio.h>
+#include <linux/printk.h>
+#include <linux/string.h>
+#include <linux/slab.h>
+
+#include "led_sys.h"
+
+
+#define AML_DEV_NAME "sysled"
+#define AML_LED_NAME "led-sys"
+
+
+static void aml_sysled_output_setup(struct aml_sysled_dev *ldev,
+ enum led_brightness value)
+{
+ unsigned int level = !!value;
+
+ if (ldev->d.active_low)
+ level = !level;
+ gpio_direction_output(ldev->d.pin, level);
+}
+
+static void aml_sysled_work(struct work_struct *work)
+{
+ struct aml_sysled_dev *ldev;
+
+ ldev = container_of(work, struct aml_sysled_dev, work);
+
+ mutex_lock(&ldev->lock);
+ aml_sysled_output_setup(ldev, ldev->new_brightness);
+ mutex_unlock(&ldev->lock);
+}
+
+
+static void aml_sysled_brightness_set(struct led_classdev *cdev,
+ enum led_brightness value)
+{
+ struct aml_sysled_dev *ldev;
+ struct platform_device *pdev;
+
+ pdev = to_platform_device(cdev->dev->parent);
+ ldev = platform_get_drvdata(pdev);
+ ldev->new_brightness = value;
+ schedule_work(&ldev->work);
+}
+
+
+static int aml_sysled_dt_parse(struct platform_device *pdev)
+{
+ struct device_node *node;
+ struct aml_sysled_dev *ldev;
+ int led_gpio;
+ enum of_gpio_flags flags;
+
+ ldev = platform_get_drvdata(pdev);
+ node = pdev->dev.of_node;
+ if (!node) {
+ pr_err("failed to find node for %s\n", AML_DEV_NAME);
+ return -ENODEV;
+ }
+
+ led_gpio = of_get_named_gpio_flags(node, "led_gpio", 0, &flags);
+ if (!gpio_is_valid(led_gpio)) {
+ pr_err("gpio %d is not valid\n", led_gpio);
+ return -EINVAL;
+ }
+
+ ldev->d.pin = led_gpio;
+ ldev->d.active_low = flags & OF_GPIO_ACTIVE_LOW;
+ pr_info("led_gpio = %u\n", ldev->d.pin);
+ pr_info("active_low = %u\n", ldev->d.active_low);
+ gpio_request(ldev->d.pin, AML_DEV_NAME);
+ gpio_direction_output(ldev->d.pin, 1);
+
+ return 0;
+}
+
+
+
+static const struct of_device_id aml_sysled_dt_match[] = {
+ {
+ .compatible = "amlogic, sysled",
+ },
+ {},
+};
+
+
+static int aml_sysled_probe(struct platform_device *pdev)
+{
+ struct aml_sysled_dev *ldev;
+ int ret;
+
+ ldev = kzalloc(sizeof(struct aml_sysled_dev), GFP_KERNEL);
+
+ /* set driver data */
+ platform_set_drvdata(pdev, ldev);
+
+ /* parse dt param */
+ ret = aml_sysled_dt_parse(pdev);
+ if (ret)
+ return ret;
+
+ /* register led class device */
+ ldev->cdev.name = AML_LED_NAME;
+ ldev->cdev.brightness_set = aml_sysled_brightness_set;
+ mutex_init(&ldev->lock);
+ INIT_WORK(&ldev->work, aml_sysled_work);
+ ret = led_classdev_register(&pdev->dev, &ldev->cdev);
+ if (ret < 0) {
+ kfree(ldev);
+ return ret;
+ }
+
+ /* set led default on */
+ aml_sysled_output_setup(ldev, 1);
+
+ pr_info("module probed ok\n");
+ return 0;
+}
+
+
+static int __exit aml_sysled_remove(struct platform_device *pdev)
+{
+ struct aml_sysled_dev *ldev = platform_get_drvdata(pdev);
+
+ led_classdev_unregister(&ldev->cdev);
+ cancel_work_sync(&ldev->work);
+ gpio_free(ldev->d.pin);
+ platform_set_drvdata(pdev, NULL);
+ kfree(ldev);
+ pr_info("module removed ok\n");
+ return 0;
+}
+
+
+static void aml_sysled_shutdown(struct platform_device *pdev)
+{
+ struct aml_sysled_dev *ldev = platform_get_drvdata(pdev);
+ /* set led off*/
+ aml_sysled_output_setup(ldev, 0);
+ pr_info("module shutdown ok\n");
+}
+
+
+#ifdef CONFIG_PM
+static int aml_sysled_suspend(struct platform_device *pdev, pm_message_t state)
+{
+ struct aml_sysled_dev *ldev = platform_get_drvdata(pdev);
+ /* set led off */
+ aml_sysled_output_setup(ldev, 0);
+ pr_info("module suspend ok\n");
+ return 0;
+}
+
+static int aml_sysled_resume(struct platform_device *pdev)
+{
+ struct aml_sysled_dev *ldev = platform_get_drvdata(pdev);
+ /* set led on */
+ aml_sysled_output_setup(ldev, 1);
+ pr_info("module resume ok\n");
+ return 0;
+}
+#endif
+
+
+static struct platform_driver aml_sysled_driver = {
+ .driver = {
+ .name = AML_DEV_NAME,
+ .owner = THIS_MODULE,
+ .of_match_table = aml_sysled_dt_match,
+ },
+ .probe = aml_sysled_probe,
+ .remove = __exit_p(aml_sysled_remove),
+ .shutdown = aml_sysled_shutdown,
+#ifdef CONFIG_PM
+ .suspend = aml_sysled_suspend,
+ .resume = aml_sysled_resume,
+#endif
+};
+
+
+static int __init aml_sysled_init(void)
+{
+ pr_info("module init\n");
+ if (platform_driver_register(&aml_sysled_driver)) {
+ pr_err("failed to register driver\n");
+ return -ENODEV;
+ }
+
+ return 0;
+}
+
+
+static void __exit aml_sysled_exit(void)
+{
+ pr_info("module exit\n");
+ platform_driver_unregister(&aml_sysled_driver);
+}
+
+
+module_init(aml_sysled_init);
+module_exit(aml_sysled_exit);
+
+MODULE_DESCRIPTION("Amlogic sys led driver");
+MODULE_LICENSE("GPL");
+MODULE_AUTHOR("Amlogic, Inc.");
+
projects / platform / kernel / linux-amlogic.git / commitdiff