v4.19.13 snapshot.
diff --git a/include/linux/leds.h b/include/linux/leds.h
new file mode 100644
index 0000000..834683d
--- /dev/null
+++ b/include/linux/leds.h
@@ -0,0 +1,475 @@
+/*
+ * Driver model for leds and led triggers
+ *
+ * Copyright (C) 2005 John Lenz <lenz@cs.wisc.edu>
+ * Copyright (C) 2005 Richard Purdie <rpurdie@openedhand.com>
+ *
+ * This program is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License version 2 as
+ * published by the Free Software Foundation.
+ *
+ */
+#ifndef __LINUX_LEDS_H_INCLUDED
+#define __LINUX_LEDS_H_INCLUDED
+
+#include <linux/device.h>
+#include <linux/kernfs.h>
+#include <linux/list.h>
+#include <linux/mutex.h>
+#include <linux/rwsem.h>
+#include <linux/spinlock.h>
+#include <linux/timer.h>
+#include <linux/workqueue.h>
+
+struct device;
+/*
+ * LED Core
+ */
+
+enum led_brightness {
+ LED_OFF = 0,
+ LED_ON = 1,
+ LED_HALF = 127,
+ LED_FULL = 255,
+};
+
+struct led_classdev {
+ const char *name;
+ enum led_brightness brightness;
+ enum led_brightness max_brightness;
+ int flags;
+
+ /* Lower 16 bits reflect status */
+#define LED_SUSPENDED BIT(0)
+#define LED_UNREGISTERING BIT(1)
+ /* Upper 16 bits reflect control information */
+#define LED_CORE_SUSPENDRESUME BIT(16)
+#define LED_SYSFS_DISABLE BIT(17)
+#define LED_DEV_CAP_FLASH BIT(18)
+#define LED_HW_PLUGGABLE BIT(19)
+#define LED_PANIC_INDICATOR BIT(20)
+#define LED_BRIGHT_HW_CHANGED BIT(21)
+#define LED_RETAIN_AT_SHUTDOWN BIT(22)
+
+ /* set_brightness_work / blink_timer flags, atomic, private. */
+ unsigned long work_flags;
+
+#define LED_BLINK_SW 0
+#define LED_BLINK_ONESHOT 1
+#define LED_BLINK_ONESHOT_STOP 2
+#define LED_BLINK_INVERT 3
+#define LED_BLINK_BRIGHTNESS_CHANGE 4
+#define LED_BLINK_DISABLE 5
+
+ /* Set LED brightness level
+ * Must not sleep. Use brightness_set_blocking for drivers
+ * that can sleep while setting brightness.
+ */
+ void (*brightness_set)(struct led_classdev *led_cdev,
+ enum led_brightness brightness);
+ /*
+ * Set LED brightness level immediately - it can block the caller for
+ * the time required for accessing a LED device register.
+ */
+ int (*brightness_set_blocking)(struct led_classdev *led_cdev,
+ enum led_brightness brightness);
+ /* Get LED brightness level */
+ enum led_brightness (*brightness_get)(struct led_classdev *led_cdev);
+
+ /*
+ * Activate hardware accelerated blink, delays are in milliseconds
+ * and if both are zero then a sensible default should be chosen.
+ * The call should adjust the timings in that case and if it can't
+ * match the values specified exactly.
+ * Deactivate blinking again when the brightness is set to LED_OFF
+ * via the brightness_set() callback.
+ */
+ int (*blink_set)(struct led_classdev *led_cdev,
+ unsigned long *delay_on,
+ unsigned long *delay_off);
+
+ struct device *dev;
+ const struct attribute_group **groups;
+
+ struct list_head node; /* LED Device list */
+ const char *default_trigger; /* Trigger to use */
+
+ unsigned long blink_delay_on, blink_delay_off;
+ struct timer_list blink_timer;
+ int blink_brightness;
+ int new_blink_brightness;
+ void (*flash_resume)(struct led_classdev *led_cdev);
+
+ struct work_struct set_brightness_work;
+ int delayed_set_value;
+
+#ifdef CONFIG_LEDS_TRIGGERS
+ /* Protects the trigger data below */
+ struct rw_semaphore trigger_lock;
+
+ struct led_trigger *trigger;
+ struct list_head trig_list;
+ void *trigger_data;
+ /* true if activated - deactivate routine uses it to do cleanup */
+ bool activated;
+#endif
+
+#ifdef CONFIG_LEDS_BRIGHTNESS_HW_CHANGED
+ int brightness_hw_changed;
+ struct kernfs_node *brightness_hw_changed_kn;
+#endif
+
+ /* Ensures consistent access to the LED Flash Class device */
+ struct mutex led_access;
+};
+
+extern int of_led_classdev_register(struct device *parent,
+ struct device_node *np,
+ struct led_classdev *led_cdev);
+#define led_classdev_register(parent, led_cdev) \
+ of_led_classdev_register(parent, NULL, led_cdev)
+extern int devm_of_led_classdev_register(struct device *parent,
+ struct device_node *np,
+ struct led_classdev *led_cdev);
+#define devm_led_classdev_register(parent, led_cdev) \
+ devm_of_led_classdev_register(parent, NULL, led_cdev)
+extern void led_classdev_unregister(struct led_classdev *led_cdev);
+extern void devm_led_classdev_unregister(struct device *parent,
+ struct led_classdev *led_cdev);
+extern void led_classdev_suspend(struct led_classdev *led_cdev);
+extern void led_classdev_resume(struct led_classdev *led_cdev);
+
+/**
+ * led_blink_set - set blinking with software fallback
+ * @led_cdev: the LED to start blinking
+ * @delay_on: the time it should be on (in ms)
+ * @delay_off: the time it should ble off (in ms)
+ *
+ * This function makes the LED blink, attempting to use the
+ * hardware acceleration if possible, but falling back to
+ * software blinking if there is no hardware blinking or if
+ * the LED refuses the passed values.
+ *
+ * Note that if software blinking is active, simply calling
+ * led_cdev->brightness_set() will not stop the blinking,
+ * use led_classdev_brightness_set() instead.
+ */
+extern void led_blink_set(struct led_classdev *led_cdev,
+ unsigned long *delay_on,
+ unsigned long *delay_off);
+/**
+ * led_blink_set_oneshot - do a oneshot software blink
+ * @led_cdev: the LED to start blinking
+ * @delay_on: the time it should be on (in ms)
+ * @delay_off: the time it should ble off (in ms)
+ * @invert: blink off, then on, leaving the led on
+ *
+ * This function makes the LED blink one time for delay_on +
+ * delay_off time, ignoring the request if another one-shot
+ * blink is already in progress.
+ *
+ * If invert is set, led blinks for delay_off first, then for
+ * delay_on and leave the led on after the on-off cycle.
+ */
+extern void led_blink_set_oneshot(struct led_classdev *led_cdev,
+ unsigned long *delay_on,
+ unsigned long *delay_off,
+ int invert);
+/**
+ * led_set_brightness - set LED brightness
+ * @led_cdev: the LED to set
+ * @brightness: the brightness to set it to
+ *
+ * Set an LED's brightness, and, if necessary, cancel the
+ * software blink timer that implements blinking when the
+ * hardware doesn't. This function is guaranteed not to sleep.
+ */
+extern void led_set_brightness(struct led_classdev *led_cdev,
+ enum led_brightness brightness);
+
+/**
+ * led_set_brightness_sync - set LED brightness synchronously
+ * @led_cdev: the LED to set
+ * @brightness: the brightness to set it to
+ *
+ * Set an LED's brightness immediately. This function will block
+ * the caller for the time required for accessing device registers,
+ * and it can sleep.
+ *
+ * Returns: 0 on success or negative error value on failure
+ */
+extern int led_set_brightness_sync(struct led_classdev *led_cdev,
+ enum led_brightness value);
+
+/**
+ * led_update_brightness - update LED brightness
+ * @led_cdev: the LED to query
+ *
+ * Get an LED's current brightness and update led_cdev->brightness
+ * member with the obtained value.
+ *
+ * Returns: 0 on success or negative error value on failure
+ */
+extern int led_update_brightness(struct led_classdev *led_cdev);
+
+/**
+ * led_sysfs_disable - disable LED sysfs interface
+ * @led_cdev: the LED to set
+ *
+ * Disable the led_cdev's sysfs interface.
+ */
+extern void led_sysfs_disable(struct led_classdev *led_cdev);
+
+/**
+ * led_sysfs_enable - enable LED sysfs interface
+ * @led_cdev: the LED to set
+ *
+ * Enable the led_cdev's sysfs interface.
+ */
+extern void led_sysfs_enable(struct led_classdev *led_cdev);
+
+/**
+ * led_sysfs_is_disabled - check if LED sysfs interface is disabled
+ * @led_cdev: the LED to query
+ *
+ * Returns: true if the led_cdev's sysfs interface is disabled.
+ */
+static inline bool led_sysfs_is_disabled(struct led_classdev *led_cdev)
+{
+ return led_cdev->flags & LED_SYSFS_DISABLE;
+}
+
+/*
+ * LED Triggers
+ */
+/* Registration functions for simple triggers */
+#define DEFINE_LED_TRIGGER(x) static struct led_trigger *x;
+#define DEFINE_LED_TRIGGER_GLOBAL(x) struct led_trigger *x;
+
+#ifdef CONFIG_LEDS_TRIGGERS
+
+#define TRIG_NAME_MAX 50
+
+struct led_trigger {
+ /* Trigger Properties */
+ const char *name;
+ int (*activate)(struct led_classdev *led_cdev);
+ void (*deactivate)(struct led_classdev *led_cdev);
+
+ /* LEDs under control by this trigger (for simple triggers) */
+ rwlock_t leddev_list_lock;
+ struct list_head led_cdevs;
+
+ /* Link to next registered trigger */
+ struct list_head next_trig;
+
+ const struct attribute_group **groups;
+};
+
+/*
+ * Currently the attributes in struct led_trigger::groups are added directly to
+ * the LED device. As this might change in the future, the following
+ * macros abstract getting the LED device and its trigger_data from the dev
+ * parameter passed to the attribute accessor functions.
+ */
+#define led_trigger_get_led(dev) ((struct led_classdev *)dev_get_drvdata((dev)))
+#define led_trigger_get_drvdata(dev) (led_get_trigger_data(led_trigger_get_led(dev)))
+
+ssize_t led_trigger_store(struct device *dev, struct device_attribute *attr,
+ const char *buf, size_t count);
+ssize_t led_trigger_show(struct device *dev, struct device_attribute *attr,
+ char *buf);
+
+/* Registration functions for complex triggers */
+extern int led_trigger_register(struct led_trigger *trigger);
+extern void led_trigger_unregister(struct led_trigger *trigger);
+extern int devm_led_trigger_register(struct device *dev,
+ struct led_trigger *trigger);
+
+extern void led_trigger_register_simple(const char *name,
+ struct led_trigger **trigger);
+extern void led_trigger_unregister_simple(struct led_trigger *trigger);
+extern void led_trigger_event(struct led_trigger *trigger,
+ enum led_brightness event);
+extern void led_trigger_blink(struct led_trigger *trigger,
+ unsigned long *delay_on,
+ unsigned long *delay_off);
+extern void led_trigger_blink_oneshot(struct led_trigger *trigger,
+ unsigned long *delay_on,
+ unsigned long *delay_off,
+ int invert);
+extern void led_trigger_set_default(struct led_classdev *led_cdev);
+extern int led_trigger_set(struct led_classdev *led_cdev,
+ struct led_trigger *trigger);
+extern void led_trigger_remove(struct led_classdev *led_cdev);
+
+static inline void led_set_trigger_data(struct led_classdev *led_cdev,
+ void *trigger_data)
+{
+ led_cdev->trigger_data = trigger_data;
+}
+
+static inline void *led_get_trigger_data(struct led_classdev *led_cdev)
+{
+ return led_cdev->trigger_data;
+}
+
+/**
+ * led_trigger_rename_static - rename a trigger
+ * @name: the new trigger name
+ * @trig: the LED trigger to rename
+ *
+ * Change a LED trigger name by copying the string passed in
+ * name into current trigger name, which MUST be large
+ * enough for the new string.
+ *
+ * Note that name must NOT point to the same string used
+ * during LED registration, as that could lead to races.
+ *
+ * This is meant to be used on triggers with statically
+ * allocated name.
+ */
+extern void led_trigger_rename_static(const char *name,
+ struct led_trigger *trig);
+
+#define module_led_trigger(__led_trigger) \
+ module_driver(__led_trigger, led_trigger_register, \
+ led_trigger_unregister)
+
+#else
+
+/* Trigger has no members */
+struct led_trigger {};
+
+/* Trigger inline empty functions */
+static inline void led_trigger_register_simple(const char *name,
+ struct led_trigger **trigger) {}
+static inline void led_trigger_unregister_simple(struct led_trigger *trigger) {}
+static inline void led_trigger_event(struct led_trigger *trigger,
+ enum led_brightness event) {}
+static inline void led_trigger_blink(struct led_trigger *trigger,
+ unsigned long *delay_on,
+ unsigned long *delay_off) {}
+static inline void led_trigger_blink_oneshot(struct led_trigger *trigger,
+ unsigned long *delay_on,
+ unsigned long *delay_off,
+ int invert) {}
+static inline void led_trigger_set_default(struct led_classdev *led_cdev) {}
+static inline int led_trigger_set(struct led_classdev *led_cdev,
+ struct led_trigger *trigger)
+{
+ return 0;
+}
+
+static inline void led_trigger_remove(struct led_classdev *led_cdev) {}
+static inline void led_set_trigger_data(struct led_classdev *led_cdev) {}
+static inline void *led_get_trigger_data(struct led_classdev *led_cdev)
+{
+ return NULL;
+}
+
+#endif /* CONFIG_LEDS_TRIGGERS */
+
+/* Trigger specific functions */
+#ifdef CONFIG_LEDS_TRIGGER_DISK
+extern void ledtrig_disk_activity(bool write);
+#else
+static inline void ledtrig_disk_activity(bool write) {}
+#endif
+
+#ifdef CONFIG_LEDS_TRIGGER_MTD
+extern void ledtrig_mtd_activity(void);
+#else
+static inline void ledtrig_mtd_activity(void) {}
+#endif
+
+#if defined(CONFIG_LEDS_TRIGGER_CAMERA) || defined(CONFIG_LEDS_TRIGGER_CAMERA_MODULE)
+extern void ledtrig_flash_ctrl(bool on);
+extern void ledtrig_torch_ctrl(bool on);
+#else
+static inline void ledtrig_flash_ctrl(bool on) {}
+static inline void ledtrig_torch_ctrl(bool on) {}
+#endif
+
+/*
+ * Generic LED platform data for describing LED names and default triggers.
+ */
+struct led_info {
+ const char *name;
+ const char *default_trigger;
+ int flags;
+};
+
+struct led_platform_data {
+ int num_leds;
+ struct led_info *leds;
+};
+
+struct gpio_desc;
+typedef int (*gpio_blink_set_t)(struct gpio_desc *desc, int state,
+ unsigned long *delay_on,
+ unsigned long *delay_off);
+
+/* For the leds-gpio driver */
+struct gpio_led {
+ const char *name;
+ const char *default_trigger;
+ unsigned gpio;
+ unsigned active_low : 1;
+ unsigned retain_state_suspended : 1;
+ unsigned panic_indicator : 1;
+ unsigned default_state : 2;
+ unsigned retain_state_shutdown : 1;
+ /* default_state should be one of LEDS_GPIO_DEFSTATE_(ON|OFF|KEEP) */
+ struct gpio_desc *gpiod;
+};
+#define LEDS_GPIO_DEFSTATE_OFF 0
+#define LEDS_GPIO_DEFSTATE_ON 1
+#define LEDS_GPIO_DEFSTATE_KEEP 2
+
+struct gpio_led_platform_data {
+ int num_leds;
+ const struct gpio_led *leds;
+
+#define GPIO_LED_NO_BLINK_LOW 0 /* No blink GPIO state low */
+#define GPIO_LED_NO_BLINK_HIGH 1 /* No blink GPIO state high */
+#define GPIO_LED_BLINK 2 /* Please, blink */
+ gpio_blink_set_t gpio_blink_set;
+};
+
+#ifdef CONFIG_NEW_LEDS
+struct platform_device *gpio_led_register_device(
+ int id, const struct gpio_led_platform_data *pdata);
+#else
+static inline struct platform_device *gpio_led_register_device(
+ int id, const struct gpio_led_platform_data *pdata)
+{
+ return 0;
+}
+#endif
+
+enum cpu_led_event {
+ CPU_LED_IDLE_START, /* CPU enters idle */
+ CPU_LED_IDLE_END, /* CPU idle ends */
+ CPU_LED_START, /* Machine starts, especially resume */
+ CPU_LED_STOP, /* Machine stops, especially suspend */
+ CPU_LED_HALTED, /* Machine shutdown */
+};
+#ifdef CONFIG_LEDS_TRIGGER_CPU
+extern void ledtrig_cpu(enum cpu_led_event evt);
+#else
+static inline void ledtrig_cpu(enum cpu_led_event evt)
+{
+ return;
+}
+#endif
+
+#ifdef CONFIG_LEDS_BRIGHTNESS_HW_CHANGED
+extern void led_classdev_notify_brightness_hw_changed(
+ struct led_classdev *led_cdev, enum led_brightness brightness);
+#else
+static inline void led_classdev_notify_brightness_hw_changed(
+ struct led_classdev *led_cdev, enum led_brightness brightness) { }
+#endif
+
+#endif /* __LINUX_LEDS_H_INCLUDED */