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/* SPDX-License-Identifier: GPL-2.0-only */ /* * Driver model for leds and led triggers * * Copyright (C) 2005 John Lenz <lenz@cs.wisc.edu> * Copyright (C) 2005 Richard Purdie <rpurdie@openedhand.com> */ #ifndef __LINUX_LEDS_H_INCLUDED #define __LINUX_LEDS_H_INCLUDED #include <dt-bindings/leds/common.h> #include <linux/device.h> #include <linux/mutex.h> #include <linux/rwsem.h> #include <linux/spinlock.h> #include <linux/timer.h> #include <linux/types.h> #include <linux/workqueue.h> struct attribute_group; struct device_node; struct fwnode_handle; struct gpio_desc; struct kernfs_node; struct led_pattern; struct platform_device; /* * LED Core */ /* This is obsolete/useless. We now support variable maximum brightness. */ enum led_brightness { LED_OFF = 0, LED_ON = 1, LED_HALF = 127, LED_FULL = 255, }; enum led_default_state { LEDS_DEFSTATE_OFF = 0, LEDS_DEFSTATE_ON = 1, LEDS_DEFSTATE_KEEP = 2, }; /** * struct led_lookup_data - represents a single LED lookup entry * * @list: internal list of all LED lookup entries * @provider: name of led_classdev providing the LED * @dev_id: name of the device associated with this LED * @con_id: name of the LED from the device's point of view */ struct led_lookup_data { struct list_head list; const char *provider; const char *dev_id; const char *con_id; }; struct led_init_data { /* device fwnode handle */ struct fwnode_handle *fwnode; /* * default <color:function> tuple, for backward compatibility * with in-driver hard-coded LED names used as a fallback when * DT "label" property is absent; it should be set to NULL * in new LED class drivers. */ const char *default_label; /* * string to be used for devicename section of LED class device * either for label based LED name composition path or for fwnode * based when devname_mandatory is true */ const char *devicename; /* * indicates if LED name should always comprise devicename section; * only LEDs exposed by drivers of hot-pluggable devices should * set it to true */ bool devname_mandatory; }; enum led_default_state led_init_default_state_get(struct fwnode_handle *fwnode); struct led_hw_trigger_type { int dummy; }; struct led_classdev { const char *name; unsigned int brightness; unsigned int max_brightness; unsigned int color; 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) #define LED_INIT_DEFAULT_TRIGGER BIT(23) #define LED_REJECT_NAME_CONFLICT BIT(24) #define LED_MULTI_COLOR BIT(25) /* 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 /* Brightness off also disables hw-blinking so it is a separate action */ #define LED_SET_BRIGHTNESS_OFF 6 #define LED_SET_BRIGHTNESS 7 #define LED_SET_BLINK 8 /* 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. * For led_blink_set_nosleep() the LED core assumes that blink_set * implementations, of drivers which do not use brightness_set_blocking, * will not sleep. Therefor if brightness_set_blocking is not set * this function must not sleep! */ int (*blink_set)(struct led_classdev *led_cdev, unsigned long *delay_on, unsigned long *delay_off); int (*pattern_set)(struct led_classdev *led_cdev, struct led_pattern *pattern, u32 len, int repeat); int (*pattern_clear)(struct led_classdev *led_cdev); 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 workqueue_struct *wq; /* LED workqueue */ struct work_struct set_brightness_work; int delayed_set_value; unsigned long delayed_delay_on; unsigned long delayed_delay_off; #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; /* LEDs that have private triggers have this set */ struct led_hw_trigger_type *trigger_type; /* Unique trigger name supported by LED set in hw control mode */ const char *hw_control_trigger; /* * Check if the LED driver supports the requested mode provided by the * defined supported trigger to setup the LED to hw control mode. * * Return 0 on success. Return -EOPNOTSUPP when the passed flags are not * supported and software fallback needs to be used. * Return a negative error number on any other case for check fail due * to various reason like device not ready or timeouts. */ int (*hw_control_is_supported)(struct led_classdev *led_cdev, unsigned long flags); /* * Activate hardware control, LED driver will use the provided flags * from the supported trigger and setup the LED to be driven by hardware * following the requested mode from the trigger flags. * Deactivate hardware blink control by setting brightness to LED_OFF via * the brightness_set() callback. * * Return 0 on success, a negative error number on flags apply fail. */ int (*hw_control_set)(struct led_classdev *led_cdev, unsigned long flags); /* * Get from the LED driver the current mode that the LED is set in hw * control mode and put them in flags. * Trigger can use this to get the initial state of a LED already set in * hardware blink control. * * Return 0 on success, a negative error number on failing parsing the * initial mode. Error from this function is NOT FATAL as the device * may be in a not supported initial state by the attached LED trigger. */ int (*hw_control_get)(struct led_classdev *led_cdev, unsigned long *flags); /* * Get the device this LED blinks in response to. * e.g. for a PHY LED, it is the network device. If the LED is * not yet associated to a device, return NULL. */ struct device *(*hw_control_get_device)(struct led_classdev *led_cdev); #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 class device */ struct mutex led_access; }; /** * led_classdev_register_ext - register a new object of LED class with * init data * @parent: LED controller device this LED is driven by * @led_cdev: the led_classdev structure for this device * @init_data: the LED class device initialization data * * Register a new object of LED class, with name derived from init_data. * * Returns: 0 on success or negative error value on failure */ int led_classdev_register_ext(struct device *parent, struct led_classdev *led_cdev, struct led_init_data *init_data); /** * led_classdev_register - register a new object of LED class * @parent: LED controller device this LED is driven by * @led_cdev: the led_classdev structure for this device * * Register a new object of LED class, with name derived from the name property * of passed led_cdev argument. * * Returns: 0 on success or negative error value on failure */ static inline int led_classdev_register(struct device *parent, struct led_classdev *led_cdev) { return led_classdev_register_ext(parent, led_cdev, NULL); } int devm_led_classdev_register_ext(struct device *parent, struct led_classdev *led_cdev, struct led_init_data *init_data); static inline int devm_led_classdev_register(struct device *parent, struct led_classdev *led_cdev) { return devm_led_classdev_register_ext(parent, led_cdev, NULL); } void led_classdev_unregister(struct led_classdev *led_cdev); void devm_led_classdev_unregister(struct device *parent, struct led_classdev *led_cdev); void led_classdev_suspend(struct led_classdev *led_cdev); void led_classdev_resume(struct led_classdev *led_cdev); void led_add_lookup(struct led_lookup_data *led_lookup); void led_remove_lookup(struct led_lookup_data *led_lookup); struct led_classdev *__must_check led_get(struct device *dev, char *con_id); struct led_classdev *__must_check devm_led_get(struct device *dev, char *con_id); extern struct led_classdev *of_led_get(struct device_node *np, int index); extern void led_put(struct led_classdev *led_cdev); struct led_classdev *__must_check devm_of_led_get(struct device *dev, int index); struct led_classdev *__must_check devm_of_led_get_optional(struct device *dev, int index); /** * 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. * * This function may sleep! * * Note that if software blinking is active, simply calling * led_cdev->brightness_set() will not stop the blinking, * use led_set_brightness() instead. */ void led_blink_set(struct led_classdev *led_cdev, unsigned long *delay_on, unsigned long *delay_off); /** * led_blink_set_nosleep - set blinking, guaranteed to not sleep * @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 and is guaranteed to not sleep. Otherwise * this is the same as led_blink_set(), see led_blink_set() for details. */ void led_blink_set_nosleep(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. * * This function is guaranteed not to sleep. */ 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. */ void led_set_brightness(struct led_classdev *led_cdev, unsigned int brightness); /** * led_set_brightness_sync - set LED brightness synchronously * @led_cdev: the LED to set * @value: 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 */ int led_set_brightness_sync(struct led_classdev *led_cdev, unsigned int value); /** * led_mc_set_brightness - set mc LED color intensity values and brightness * @led_cdev: the LED to set * @intensity_value: array of per color intensity values to set * @num_colors: amount of entries in intensity_value array * @brightness: the brightness to set the LED to * * Set a multi-color LED's per color intensity values and brightness. * If necessary, this cancels the software blink timer. This function is * guaranteed not to sleep. * * Calling this function on a non multi-color led_classdev or with the wrong * num_colors value is an error. In this case an error will be logged once * and the call will do nothing. */ void led_mc_set_brightness(struct led_classdev *led_cdev, unsigned int *intensity_value, unsigned int num_colors, unsigned int brightness); /** * 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 */ int led_update_brightness(struct led_classdev *led_cdev); /** * led_get_default_pattern - return default pattern * * @led_cdev: the LED to get default pattern for * @size: pointer for storing the number of elements in returned array, * modified only if return != NULL * * Return: Allocated array of integers with default pattern from device tree * or NULL. Caller is responsible for kfree(). */ u32 *led_get_default_pattern(struct led_classdev *led_cdev, unsigned int *size); /** * led_sysfs_disable - disable LED sysfs interface * @led_cdev: the LED to set * * Disable the led_cdev's sysfs interface. */ 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. */ void led_sysfs_enable(struct led_classdev *led_cdev); /** * led_compose_name - compose LED class device name * @dev: LED controller device object * @init_data: the LED class device initialization data * @led_classdev_name: composed LED class device name * * Create LED class device name basing on the provided init_data argument. * The name can have <devicename:color:function> or <color:function>. * form, depending on the init_data configuration. * * Returns: 0 on success or negative error value on failure */ int led_compose_name(struct device *dev, struct led_init_data *init_data, char *led_classdev_name); /** * led_get_color_name - get string representation of color ID * @color_id: The LED_COLOR_ID_* constant * * Get the string name of a LED_COLOR_ID_* constant. * * Returns: A string constant or NULL on an invalid ID. */ const char *led_get_color_name(u8 color_id); /** * 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); /* Brightness set by led_trigger_event */ enum led_brightness brightness; /* LED-private triggers have this set */ struct led_hw_trigger_type *trigger_type; /* LEDs under control by this trigger (for simple triggers) */ spinlock_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))) /* Registration functions for complex triggers */ int led_trigger_register(struct led_trigger *trigger); void led_trigger_unregister(struct led_trigger *trigger); int devm_led_trigger_register(struct device *dev, struct led_trigger *trigger); void led_trigger_register_simple(const char *name, struct led_trigger **trigger); void led_trigger_unregister_simple(struct led_trigger *trigger); void led_trigger_event(struct led_trigger *trigger, enum led_brightness event); void led_mc_trigger_event(struct led_trigger *trig, unsigned int *intensity_value, unsigned int num_colors, enum led_brightness brightness); void led_trigger_blink(struct led_trigger *trigger, unsigned long delay_on, unsigned long delay_off); void led_trigger_blink_oneshot(struct led_trigger *trigger, unsigned long delay_on, unsigned long delay_off, int invert); void led_trigger_set_default(struct led_classdev *led_cdev); int led_trigger_set(struct led_classdev *led_cdev, struct led_trigger *trigger); 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; } static inline enum led_brightness led_trigger_get_brightness(const struct led_trigger *trigger) { return trigger ? trigger->brightness : LED_OFF; } #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_mc_trigger_event(struct led_trigger *trig, unsigned int *intensity_value, unsigned int num_colors, enum led_brightness brightness) {} 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; } static inline enum led_brightness led_trigger_get_brightness(const struct led_trigger *trigger) { return LED_OFF; } #endif /* CONFIG_LEDS_TRIGGERS */ /* Trigger specific enum */ enum led_trigger_netdev_modes { TRIGGER_NETDEV_LINK = 0, TRIGGER_NETDEV_LINK_10, TRIGGER_NETDEV_LINK_100, TRIGGER_NETDEV_LINK_1000, TRIGGER_NETDEV_LINK_2500, TRIGGER_NETDEV_LINK_5000, TRIGGER_NETDEV_LINK_10000, TRIGGER_NETDEV_HALF_DUPLEX, TRIGGER_NETDEV_FULL_DUPLEX, TRIGGER_NETDEV_TX, TRIGGER_NETDEV_RX, TRIGGER_NETDEV_TX_ERR, TRIGGER_NETDEV_RX_ERR, /* Keep last */ __TRIGGER_NETDEV_MAX, }; /* Trigger specific functions */ #ifdef CONFIG_LEDS_TRIGGER_DISK void ledtrig_disk_activity(bool write); #else static inline void ledtrig_disk_activity(bool write) {} #endif #ifdef CONFIG_LEDS_TRIGGER_MTD 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) void ledtrig_flash_ctrl(bool on); 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 led_properties { u32 color; bool color_present; const char *function; u32 func_enum; bool func_enum_present; const char *label; }; 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 LEDS_DEFSTATE_OFF #define LEDS_GPIO_DEFSTATE_ON LEDS_DEFSTATE_ON #define LEDS_GPIO_DEFSTATE_KEEP LEDS_DEFSTATE_KEEP 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_LEDS_GPIO_REGISTER 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 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 void led_classdev_notify_brightness_hw_changed( struct led_classdev *led_cdev, unsigned int brightness); #else static inline void led_classdev_notify_brightness_hw_changed( struct led_classdev *led_cdev, enum led_brightness brightness) { } #endif /** * struct led_pattern - pattern interval settings * @delta_t: pattern interval delay, in milliseconds * @brightness: pattern interval brightness */ struct led_pattern { u32 delta_t; int brightness; }; enum led_audio { LED_AUDIO_MUTE, /* master mute LED */ LED_AUDIO_MICMUTE, /* mic mute LED */ NUM_AUDIO_LEDS }; #endif /* __LINUX_LEDS_H_INCLUDED */