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+/*
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+ * LEDs driver for GPIOs
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+ *
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+ * Copyright (C) 2007 8D Technologies inc.
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+ * Raphael Assenat <raph@8d.com>
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+ * Copyright (C) 2008 Freescale Semiconductor, Inc.
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+ *
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+ * This program is free software; you can redistribute it and/or modify
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+ * it under the terms of the GNU General Public License version 2 as
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+ * published by the Free Software Foundation.
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+ *
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+ */
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+#include <linux/err.h>
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+#include <linux/gpio.h>
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+#include <linux/gpio/consumer.h>
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+#include <linux/kernel.h>
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+#include <linux/leds.h>
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+#include <linux/module.h>
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+#include <linux/of.h>
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+#include <linux/platform_device.h>
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+#include <linux/property.h>
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+#include <linux/slab.h>
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+#include <linux/delay.h>
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+
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+struct gpio_led_data {
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+ struct led_classdev cdev;
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+ struct gpio_desc *gpiod;
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+ u8 can_sleep;
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+ u8 blinking;
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+ gpio_blink_set_t platform_gpio_blink_set;
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+};
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+
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+static inline struct gpio_led_data *
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+ cdev_to_gpio_led_data(struct led_classdev *led_cdev)
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+{
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+ return container_of(led_cdev, struct gpio_led_data, cdev);
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+}
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+
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+static void gpio_led_set(struct led_classdev *led_cdev,
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+ enum led_brightness value)
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+{
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+ struct gpio_led_data *led_dat = cdev_to_gpio_led_data(led_cdev);
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+ int level;
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+
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+ if (value == LED_OFF)
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+ level = 0;
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+ else
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+ level = 1;
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+
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+ if (led_dat->blinking) {
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+ led_dat->platform_gpio_blink_set(led_dat->gpiod, level,
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+ NULL, NULL);
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+ led_dat->blinking = 0;
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+ } else {
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+ if (led_dat->can_sleep)
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+ gpiod_set_value_cansleep(led_dat->gpiod, level);
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+ else
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+ gpiod_set_value(led_dat->gpiod, level);
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+ }
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+}
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+
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+static int gpio_led_set_blocking(struct led_classdev *led_cdev,
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+ enum led_brightness value)
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+{
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+ gpio_led_set(led_cdev, value);
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+ return 0;
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+}
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+
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+static int gpio_blink_set(struct led_classdev *led_cdev,
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+ unsigned long *delay_on, unsigned long *delay_off)
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+{
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+ struct gpio_led_data *led_dat = cdev_to_gpio_led_data(led_cdev);
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+
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+ led_dat->blinking = 1;
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+ return led_dat->platform_gpio_blink_set(led_dat->gpiod, GPIO_LED_BLINK,
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+ delay_on, delay_off);
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+}
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+
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+static int create_gpio_led(const struct gpio_led *template,
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+ struct gpio_led_data *led_dat, struct device *parent,
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+ struct device_node *np, gpio_blink_set_t blink_set)
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+{
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+ int ret, state;
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+
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+ led_dat->gpiod = template->gpiod;
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+ if (!led_dat->gpiod) {
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+ /*
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+ * This is the legacy code path for platform code that
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+ * still uses GPIO numbers. Ultimately we would like to get
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+ * rid of this block completely.
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+ */
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+ unsigned long flags = GPIOF_OUT_INIT_LOW;
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+
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+ /* skip leds that aren't available */
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+ if (!gpio_is_valid(template->gpio)) {
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+ dev_info(parent, "Skipping unavailable LED gpio %d (%s)\n",
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+ template->gpio, template->name);
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+ return 0;
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+ }
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+
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+ if (template->active_low)
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+ flags |= GPIOF_ACTIVE_LOW;
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+
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+ ret = devm_gpio_request_one(parent, template->gpio, flags,
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+ template->name);
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+ if (ret < 0)
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+ return ret;
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+
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+ led_dat->gpiod = gpio_to_desc(template->gpio);
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+ if (!led_dat->gpiod)
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+ return -EINVAL;
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+ }
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+
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+ led_dat->cdev.name = template->name;
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+ led_dat->cdev.default_trigger = template->default_trigger;
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+ led_dat->can_sleep = gpiod_cansleep(led_dat->gpiod);
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+ if (!led_dat->can_sleep)
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+ led_dat->cdev.brightness_set = gpio_led_set;
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+ else
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+ led_dat->cdev.brightness_set_blocking = gpio_led_set_blocking;
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+ led_dat->blinking = 0;
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+ if (blink_set) {
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+ led_dat->platform_gpio_blink_set = blink_set;
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+ led_dat->cdev.blink_set = gpio_blink_set;
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+ }
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+ if (template->default_state == LEDS_GPIO_DEFSTATE_KEEP) {
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+ state = gpiod_get_value_cansleep(led_dat->gpiod);
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+ if (state < 0)
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+ return state;
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+ } else {
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+ state = (template->default_state == LEDS_GPIO_DEFSTATE_ON);
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+ }
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+ led_dat->cdev.brightness = state ? LED_FULL : LED_OFF;
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+ if (!template->retain_state_suspended)
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+ led_dat->cdev.flags |= LED_CORE_SUSPENDRESUME;
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+ if (template->panic_indicator)
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+ led_dat->cdev.flags |= LED_PANIC_INDICATOR;
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+ if (template->retain_state_shutdown)
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+ led_dat->cdev.flags |= LED_RETAIN_AT_SHUTDOWN;
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+
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+ ret = gpiod_direction_output(led_dat->gpiod, state);
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+ if (ret < 0)
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+ return ret;
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+
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+ //delay trigger,wucaicheng,1378913492@qq.com,20230914
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+ if (template->delay_reg > 0) {
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+ msleep(template->delay_reg);
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+ }
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+
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+ return devm_of_led_classdev_register(parent, np, &led_dat->cdev);
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+}
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+
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+struct gpio_leds_priv {
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+ int num_leds;
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+ struct gpio_led_data leds[];
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+};
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+
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+static inline int sizeof_gpio_leds_priv(int num_leds)
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+{
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+ return sizeof(struct gpio_leds_priv) +
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+ (sizeof(struct gpio_led_data) * num_leds);
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+}
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+
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+static struct gpio_leds_priv *gpio_leds_create(struct platform_device *pdev)
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+{
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+ struct device *dev = &pdev->dev;
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+ struct fwnode_handle *child;
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+ struct gpio_leds_priv *priv;
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+ int count, ret;
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+
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+ count = device_get_child_node_count(dev);
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+ if (!count)
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+ return ERR_PTR(-ENODEV);
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+
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+ priv = devm_kzalloc(dev, sizeof_gpio_leds_priv(count), GFP_KERNEL);
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+ if (!priv)
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+ return ERR_PTR(-ENOMEM);
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+
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+ device_for_each_child_node(dev, child) {
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+ struct gpio_led_data *led_dat = &priv->leds[priv->num_leds];
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+ struct gpio_led led = {};
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+ const char *state = NULL;
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+ struct device_node *np = to_of_node(child);
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+
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+ ret = fwnode_property_read_string(child, "label", &led.name);
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+ if (ret && IS_ENABLED(CONFIG_OF) && np)
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+ led.name = np->name;
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+ if (!led.name) {
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+ fwnode_handle_put(child);
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+ return ERR_PTR(-EINVAL);
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+ }
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+
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+ led.gpiod = devm_fwnode_get_gpiod_from_child(dev, NULL, child,
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+ GPIOD_ASIS,
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+ led.name);
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+ if (IS_ERR(led.gpiod)) {
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+ fwnode_handle_put(child);
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+ return ERR_CAST(led.gpiod);
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+ }
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+
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+ fwnode_property_read_string(child, "linux,default-trigger",
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+ &led.default_trigger);
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+
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+ //delay trigger,wucaicheng,1378913492@qq.com,20230914
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+ of_property_read_u32(np, "linux,delay-reg", &led.delay_reg);
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+ of_property_read_u32(np, "linux,blink-delay-on", (u32*)(&led_dat->cdev.blink_delay_on));
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+ of_property_read_u32(np, "linux,blink-delay-off", (u32*)(&led_dat->cdev.blink_delay_off));
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+
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+
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+ if (!fwnode_property_read_string(child, "default-state",
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+ &state)) {
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+ if (!strcmp(state, "keep"))
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+ led.default_state = LEDS_GPIO_DEFSTATE_KEEP;
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+ else if (!strcmp(state, "on"))
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+ led.default_state = LEDS_GPIO_DEFSTATE_ON;
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+ else
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+ led.default_state = LEDS_GPIO_DEFSTATE_OFF;
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+ }
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+
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+ if (fwnode_property_present(child, "retain-state-suspended"))
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+ led.retain_state_suspended = 1;
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+ if (fwnode_property_present(child, "retain-state-shutdown"))
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+ led.retain_state_shutdown = 1;
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+ if (fwnode_property_present(child, "panic-indicator"))
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+ led.panic_indicator = 1;
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+
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+ ret = create_gpio_led(&led, led_dat, dev, np, NULL);
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+ if (ret < 0) {
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+ fwnode_handle_put(child);
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+ return ERR_PTR(ret);
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+ }
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+ led_dat->cdev.dev->of_node = np;
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+ priv->num_leds++;
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+ }
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+
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+ return priv;
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+}
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+
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+static const struct of_device_id of_gpio_leds_match[] = {
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+ { .compatible = "gpio-leds", },
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+ {},
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+};
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+
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+MODULE_DEVICE_TABLE(of, of_gpio_leds_match);
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+
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+static int gpio_led_probe(struct platform_device *pdev)
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+{
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+ struct gpio_led_platform_data *pdata = dev_get_platdata(&pdev->dev);
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+ struct gpio_leds_priv *priv;
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+ int i, ret = 0;
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+
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+ if (pdata && pdata->num_leds) {
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+ priv = devm_kzalloc(&pdev->dev,
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+ sizeof_gpio_leds_priv(pdata->num_leds),
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+ GFP_KERNEL);
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+ if (!priv)
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+ return -ENOMEM;
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+
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+ priv->num_leds = pdata->num_leds;
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+ for (i = 0; i < priv->num_leds; i++) {
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+ ret = create_gpio_led(&pdata->leds[i], &priv->leds[i],
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+ &pdev->dev, NULL,
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+ pdata->gpio_blink_set);
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+ if (ret < 0)
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+ return ret;
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+ }
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+ } else {
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+ priv = gpio_leds_create(pdev);
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+ if (IS_ERR(priv))
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+ return PTR_ERR(priv);
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+ }
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+
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+ platform_set_drvdata(pdev, priv);
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+
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+ return 0;
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+}
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+
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+static void gpio_led_shutdown(struct platform_device *pdev)
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+{
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+ struct gpio_leds_priv *priv = platform_get_drvdata(pdev);
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+ int i;
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+
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+ for (i = 0; i < priv->num_leds; i++) {
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+ struct gpio_led_data *led = &priv->leds[i];
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+
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+ if (!(led->cdev.flags & LED_RETAIN_AT_SHUTDOWN))
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+ gpio_led_set(&led->cdev, LED_OFF);
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+ }
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+}
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+
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+static struct platform_driver gpio_led_driver = {
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+ .probe = gpio_led_probe,
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+ .shutdown = gpio_led_shutdown,
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+ .driver = {
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+ .name = "leds-gpio",
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+ .of_match_table = of_gpio_leds_match,
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+ },
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+};
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+
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+module_platform_driver(gpio_led_driver);
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+
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+MODULE_AUTHOR("Raphael Assenat <raph@8d.com>, Trent Piepho <tpiepho@freescale.com>");
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+MODULE_DESCRIPTION("GPIO LED driver");
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+MODULE_LICENSE("GPL");
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+MODULE_ALIAS("platform:leds-gpio");
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