include/linux/leds.h

   1 /* SPDX-License-Identifier: GPL-2.0-only */
   2 /*
   3  * Driver model for leds and led triggers
   4  *
   5  * Copyright (C) 2005 John Lenz <lenz@cs.wisc.edu>
   6  * Copyright (C) 2005 Richard Purdie <rpurdie@openedhand.com>
   7  */
   8 #ifndef __LINUX_LEDS_H_INCLUDED
   9 #define __LINUX_LEDS_H_INCLUDED
  10
  11 #include <dt-bindings/leds/common.h>
  12 #include <linux/device.h>
  13 #include <linux/mutex.h>
  14 #include <linux/rwsem.h>
  15 #include <linux/spinlock.h>
  16 #include <linux/timer.h>
  17 #include <linux/types.h>
  18 #include <linux/workqueue.h>
  19
  20 struct attribute_group;
  21 struct device_node;
  22 struct fwnode_handle;
  23 struct gpio_desc;
  24 struct kernfs_node;
  25 struct led_pattern;
  26 struct platform_device;
  27
  28 /*
  29  * LED Core
  30  */
  31
  32 /* This is obsolete/useless. We now support variable maximum brightness. */
  33 enum led_brightness {
  34         LED_OFF         = 0,
  35         LED_ON          = 1,
  36         LED_HALF        = 127,
  37         LED_FULL        = 255,
  38 };
  39
  40 enum led_default_state {
  41         LEDS_DEFSTATE_OFF       = 0,
  42         LEDS_DEFSTATE_ON        = 1,
  43         LEDS_DEFSTATE_KEEP      = 2,
  44 };
  45
  46 /**
  47  * struct led_lookup_data - represents a single LED lookup entry
  48  *
  49  * @list: internal list of all LED lookup entries
  50  * @provider: name of led_classdev providing the LED
  51  * @dev_id: name of the device associated with this LED
  52  * @con_id: name of the LED from the device's point of view
  53  */
  54 struct led_lookup_data {
  55         struct list_head list;
  56         const char *provider;
  57         const char *dev_id;
  58         const char *con_id;
  59 };
  60
  61 struct led_init_data {
  62         /* device fwnode handle */
  63         struct fwnode_handle *fwnode;
  64         /*
  65          * default <color:function> tuple, for backward compatibility
  66          * with in-driver hard-coded LED names used as a fallback when
  67          * DT "label" property is absent; it should be set to NULL
  68          * in new LED class drivers.
  69          */
  70         const char *default_label;
  71         /*
  72          * string to be used for devicename section of LED class device
  73          * either for label based LED name composition path or for fwnode
  74          * based when devname_mandatory is true
  75          */
  76         const char *devicename;
  77         /*
  78          * indicates if LED name should always comprise devicename section;
  79          * only LEDs exposed by drivers of hot-pluggable devices should
  80          * set it to true
  81          */
  82         bool devname_mandatory;
  83 };
  84
  85 #if IS_ENABLED(CONFIG_NEW_LEDS)
  86 enum led_default_state led_init_default_state_get(struct fwnode_handle *fwnode);
  87 #else
  88 static inline enum led_default_state
  89 led_init_default_state_get(struct fwnode_handle *fwnode)
  90 {
  91         return LEDS_DEFSTATE_OFF;
  92 }
  93 #endif
  94
  95 struct led_hw_trigger_type {
  96         int dummy;
  97 };
  98
  99 struct led_classdev {
 100         const char              *name;
 101         unsigned int brightness;
 102         unsigned int max_brightness;
 103         int                      flags;
 104
 105         /* Lower 16 bits reflect status */
 106 #define LED_SUSPENDED           BIT(0)
 107 #define LED_UNREGISTERING       BIT(1)
 108         /* Upper 16 bits reflect control information */
 109 #define LED_CORE_SUSPENDRESUME  BIT(16)
 110 #define LED_SYSFS_DISABLE       BIT(17)
 111 #define LED_DEV_CAP_FLASH       BIT(18)
 112 #define LED_HW_PLUGGABLE        BIT(19)
 113 #define LED_PANIC_INDICATOR     BIT(20)
 114 #define LED_BRIGHT_HW_CHANGED   BIT(21)
 115 #define LED_RETAIN_AT_SHUTDOWN  BIT(22)
 116 #define LED_INIT_DEFAULT_TRIGGER BIT(23)
 117
 118         /* set_brightness_work / blink_timer flags, atomic, private. */
 119         unsigned long           work_flags;
 120
 121 #define LED_BLINK_SW                    0
 122 #define LED_BLINK_ONESHOT               1
 123 #define LED_BLINK_ONESHOT_STOP          2
 124 #define LED_BLINK_INVERT                3
 125 #define LED_BLINK_BRIGHTNESS_CHANGE     4
 126 #define LED_BLINK_DISABLE               5
 127
 128         /* Set LED brightness level
 129          * Must not sleep. Use brightness_set_blocking for drivers
 130          * that can sleep while setting brightness.
 131          */
 132         void            (*brightness_set)(struct led_classdev *led_cdev,
 133                                           enum led_brightness brightness);
 134         /*
 135          * Set LED brightness level immediately - it can block the caller for
 136          * the time required for accessing a LED device register.
 137          */
 138         int (*brightness_set_blocking)(struct led_classdev *led_cdev,
 139                                        enum led_brightness brightness);
 140         /* Get LED brightness level */
 141         enum led_brightness (*brightness_get)(struct led_classdev *led_cdev);
 142
 143         /*
 144          * Activate hardware accelerated blink, delays are in milliseconds
 145          * and if both are zero then a sensible default should be chosen.
 146          * The call should adjust the timings in that case and if it can't
 147          * match the values specified exactly.
 148          * Deactivate blinking again when the brightness is set to LED_OFF
 149          * via the brightness_set() callback.
 150          */
 151         int             (*blink_set)(struct led_classdev *led_cdev,
 152                                      unsigned long *delay_on,
 153                                      unsigned long *delay_off);
 154
 155         int (*pattern_set)(struct led_classdev *led_cdev,
 156                            struct led_pattern *pattern, u32 len, int repeat);
 157         int (*pattern_clear)(struct led_classdev *led_cdev);
 158
 159         struct device           *dev;
 160         const struct attribute_group    **groups;
 161
 162         struct list_head         node;                  /* LED Device list */
 163         const char              *default_trigger;       /* Trigger to use */
 164
 165         unsigned long            blink_delay_on, blink_delay_off;
 166         struct timer_list        blink_timer;
 167         int                      blink_brightness;
 168         int                      new_blink_brightness;
 169         void                    (*flash_resume)(struct led_classdev *led_cdev);
 170
 171         struct work_struct      set_brightness_work;
 172         int                     delayed_set_value;
 173
 174 #ifdef CONFIG_LEDS_TRIGGERS
 175         /* Protects the trigger data below */
 176         struct rw_semaphore      trigger_lock;
 177
 178         struct led_trigger      *trigger;
 179         struct list_head         trig_list;
 180         void                    *trigger_data;
 181         /* true if activated - deactivate routine uses it to do cleanup */
 182         bool                    activated;
 183
 184         /* LEDs that have private triggers have this set */
 185         struct led_hw_trigger_type      *trigger_type;
 186 #endif
 187
 188 #ifdef CONFIG_LEDS_BRIGHTNESS_HW_CHANGED
 189         int                      brightness_hw_changed;
 190         struct kernfs_node      *brightness_hw_changed_kn;
 191 #endif
 192
 193         /* Ensures consistent access to the LED Flash Class device */
 194         struct mutex            led_access;
 195 };
 196
 197 /**
 198  * led_classdev_register_ext - register a new object of LED class with
 199  *                             init data
 200  * @parent: LED controller device this LED is driven by
 201  * @led_cdev: the led_classdev structure for this device
 202  * @init_data: the LED class device initialization data
 203  *
 204  * Register a new object of LED class, with name derived from init_data.
 205  *
 206  * Returns: 0 on success or negative error value on failure
 207  */
 208 int led_classdev_register_ext(struct device *parent,
 209                                      struct led_classdev *led_cdev,
 210                                      struct led_init_data *init_data);
 211
 212 /**
 213  * led_classdev_register - register a new object of LED class
 214  * @parent: LED controller device this LED is driven by
 215  * @led_cdev: the led_classdev structure for this device
 216  *
 217  * Register a new object of LED class, with name derived from the name property
 218  * of passed led_cdev argument.
 219  *
 220  * Returns: 0 on success or negative error value on failure
 221  */
 222 static inline int led_classdev_register(struct device *parent,
 223                                         struct led_classdev *led_cdev)
 224 {
 225         return led_classdev_register_ext(parent, led_cdev, NULL);
 226 }
 227
 228 #if IS_ENABLED(CONFIG_LEDS_CLASS)
 229 int devm_led_classdev_register_ext(struct device *parent,
 230                                           struct led_classdev *led_cdev,
 231                                           struct led_init_data *init_data);
 232 #else
 233 static inline int
 234 devm_led_classdev_register_ext(struct device *parent,
 235                                struct led_classdev *led_cdev,
 236                                struct led_init_data *init_data)
 237 {
 238         return 0;
 239 }
 240 #endif
 241
 242 static inline int devm_led_classdev_register(struct device *parent,
 243                                              struct led_classdev *led_cdev)
 244 {
 245         return devm_led_classdev_register_ext(parent, led_cdev, NULL);
 246 }
 247 void led_classdev_unregister(struct led_classdev *led_cdev);
 248 void devm_led_classdev_unregister(struct device *parent,
 249                                   struct led_classdev *led_cdev);
 250 void led_classdev_suspend(struct led_classdev *led_cdev);
 251 void led_classdev_resume(struct led_classdev *led_cdev);
 252
 253 void led_add_lookup(struct led_lookup_data *led_lookup);
 254 void led_remove_lookup(struct led_lookup_data *led_lookup);
 255
 256 struct led_classdev *__must_check led_get(struct device *dev, char *con_id);
 257 struct led_classdev *__must_check devm_led_get(struct device *dev, char *con_id);
 258
 259 extern struct led_classdev *of_led_get(struct device_node *np, int index);
 260 extern void led_put(struct led_classdev *led_cdev);
 261 struct led_classdev *__must_check devm_of_led_get(struct device *dev,
 262                                                   int index);
 263
 264 /**
 265  * led_blink_set - set blinking with software fallback
 266  * @led_cdev: the LED to start blinking
 267  * @delay_on: the time it should be on (in ms)
 268  * @delay_off: the time it should ble off (in ms)
 269  *
 270  * This function makes the LED blink, attempting to use the
 271  * hardware acceleration if possible, but falling back to
 272  * software blinking if there is no hardware blinking or if
 273  * the LED refuses the passed values.
 274  *
 275  * Note that if software blinking is active, simply calling
 276  * led_cdev->brightness_set() will not stop the blinking,
 277  * use led_set_brightness() instead.
 278  */
 279 void led_blink_set(struct led_classdev *led_cdev, unsigned long *delay_on,
 280                    unsigned long *delay_off);
 281 /**
 282  * led_blink_set_oneshot - do a oneshot software blink
 283  * @led_cdev: the LED to start blinking
 284  * @delay_on: the time it should be on (in ms)
 285  * @delay_off: the time it should ble off (in ms)
 286  * @invert: blink off, then on, leaving the led on
 287  *
 288  * This function makes the LED blink one time for delay_on +
 289  * delay_off time, ignoring the request if another one-shot
 290  * blink is already in progress.
 291  *
 292  * If invert is set, led blinks for delay_off first, then for
 293  * delay_on and leave the led on after the on-off cycle.
 294  */
 295 void led_blink_set_oneshot(struct led_classdev *led_cdev,
 296                            unsigned long *delay_on, unsigned long *delay_off,
 297                            int invert);
 298 /**
 299  * led_set_brightness - set LED brightness
 300  * @led_cdev: the LED to set
 301  * @brightness: the brightness to set it to
 302  *
 303  * Set an LED's brightness, and, if necessary, cancel the
 304  * software blink timer that implements blinking when the
 305  * hardware doesn't. This function is guaranteed not to sleep.
 306  */
 307 void led_set_brightness(struct led_classdev *led_cdev, unsigned int brightness);
 308
 309 /**
 310  * led_set_brightness_sync - set LED brightness synchronously
 311  * @led_cdev: the LED to set
 312  * @value: the brightness to set it to
 313  *
 314  * Set an LED's brightness immediately. This function will block
 315  * the caller for the time required for accessing device registers,
 316  * and it can sleep.
 317  *
 318  * Returns: 0 on success or negative error value on failure
 319  */
 320 int led_set_brightness_sync(struct led_classdev *led_cdev, unsigned int value);
 321
 322 /**
 323  * led_update_brightness - update LED brightness
 324  * @led_cdev: the LED to query
 325  *
 326  * Get an LED's current brightness and update led_cdev->brightness
 327  * member with the obtained value.
 328  *
 329  * Returns: 0 on success or negative error value on failure
 330  */
 331 int led_update_brightness(struct led_classdev *led_cdev);
 332
 333 /**
 334  * led_get_default_pattern - return default pattern
 335  *
 336  * @led_cdev: the LED to get default pattern for
 337  * @size:     pointer for storing the number of elements in returned array,
 338  *            modified only if return != NULL
 339  *
 340  * Return:    Allocated array of integers with default pattern from device tree
 341  *            or NULL.  Caller is responsible for kfree().
 342  */
 343 u32 *led_get_default_pattern(struct led_classdev *led_cdev, unsigned int *size);
 344
 345 /**
 346  * led_sysfs_disable - disable LED sysfs interface
 347  * @led_cdev: the LED to set
 348  *
 349  * Disable the led_cdev's sysfs interface.
 350  */
 351 void led_sysfs_disable(struct led_classdev *led_cdev);
 352
 353 /**
 354  * led_sysfs_enable - enable LED sysfs interface
 355  * @led_cdev: the LED to set
 356  *
 357  * Enable the led_cdev's sysfs interface.
 358  */
 359 void led_sysfs_enable(struct led_classdev *led_cdev);
 360
 361 /**
 362  * led_compose_name - compose LED class device name
 363  * @dev: LED controller device object
 364  * @init_data: the LED class device initialization data
 365  * @led_classdev_name: composed LED class device name
 366  *
 367  * Create LED class device name basing on the provided init_data argument.
 368  * The name can have <devicename:color:function> or <color:function>.
 369  * form, depending on the init_data configuration.
 370  *
 371  * Returns: 0 on success or negative error value on failure
 372  */
 373 int led_compose_name(struct device *dev, struct led_init_data *init_data,
 374                      char *led_classdev_name);
 375
 376 /**
 377  * led_sysfs_is_disabled - check if LED sysfs interface is disabled
 378  * @led_cdev: the LED to query
 379  *
 380  * Returns: true if the led_cdev's sysfs interface is disabled.
 381  */
 382 static inline bool led_sysfs_is_disabled(struct led_classdev *led_cdev)
 383 {
 384         return led_cdev->flags & LED_SYSFS_DISABLE;
 385 }
 386
 387 /*
 388  * LED Triggers
 389  */
 390 /* Registration functions for simple triggers */
 391 #define DEFINE_LED_TRIGGER(x)           static struct led_trigger *x;
 392 #define DEFINE_LED_TRIGGER_GLOBAL(x)    struct led_trigger *x;
 393
 394 #ifdef CONFIG_LEDS_TRIGGERS
 395
 396 #define TRIG_NAME_MAX 50
 397
 398 struct led_trigger {
 399         /* Trigger Properties */
 400         const char       *name;
 401         int             (*activate)(struct led_classdev *led_cdev);
 402         void            (*deactivate)(struct led_classdev *led_cdev);
 403
 404         /* LED-private triggers have this set */
 405         struct led_hw_trigger_type *trigger_type;
 406
 407         /* LEDs under control by this trigger (for simple triggers) */
 408         spinlock_t        leddev_list_lock;
 409         struct list_head  led_cdevs;
 410
 411         /* Link to next registered trigger */
 412         struct list_head  next_trig;
 413
 414         const struct attribute_group **groups;
 415 };
 416
 417 /*
 418  * Currently the attributes in struct led_trigger::groups are added directly to
 419  * the LED device. As this might change in the future, the following
 420  * macros abstract getting the LED device and its trigger_data from the dev
 421  * parameter passed to the attribute accessor functions.
 422  */
 423 #define led_trigger_get_led(dev)        ((struct led_classdev *)dev_get_drvdata((dev)))
 424 #define led_trigger_get_drvdata(dev)    (led_get_trigger_data(led_trigger_get_led(dev)))
 425
 426 /* Registration functions for complex triggers */
 427 int led_trigger_register(struct led_trigger *trigger);
 428 void led_trigger_unregister(struct led_trigger *trigger);
 429 int devm_led_trigger_register(struct device *dev,
 430                                      struct led_trigger *trigger);
 431
 432 void led_trigger_register_simple(const char *name,
 433                                 struct led_trigger **trigger);
 434 void led_trigger_unregister_simple(struct led_trigger *trigger);
 435 void led_trigger_event(struct led_trigger *trigger,  enum led_brightness event);
 436 void led_trigger_blink(struct led_trigger *trigger, unsigned long *delay_on,
 437                        unsigned long *delay_off);
 438 void led_trigger_blink_oneshot(struct led_trigger *trigger,
 439                                unsigned long *delay_on,
 440                                unsigned long *delay_off,
 441                                int invert);
 442 void led_trigger_set_default(struct led_classdev *led_cdev);
 443 int led_trigger_set(struct led_classdev *led_cdev, struct led_trigger *trigger);
 444 void led_trigger_remove(struct led_classdev *led_cdev);
 445
 446 static inline void led_set_trigger_data(struct led_classdev *led_cdev,
 447                                         void *trigger_data)
 448 {
 449         led_cdev->trigger_data = trigger_data;
 450 }
 451
 452 static inline void *led_get_trigger_data(struct led_classdev *led_cdev)
 453 {
 454         return led_cdev->trigger_data;
 455 }
 456
 457 /**
 458  * led_trigger_rename_static - rename a trigger
 459  * @name: the new trigger name
 460  * @trig: the LED trigger to rename
 461  *
 462  * Change a LED trigger name by copying the string passed in
 463  * name into current trigger name, which MUST be large
 464  * enough for the new string.
 465  *
 466  * Note that name must NOT point to the same string used
 467  * during LED registration, as that could lead to races.
 468  *
 469  * This is meant to be used on triggers with statically
 470  * allocated name.
 471  */
 472 void led_trigger_rename_static(const char *name, struct led_trigger *trig);
 473
 474 #define module_led_trigger(__led_trigger) \
 475         module_driver(__led_trigger, led_trigger_register, \
 476                       led_trigger_unregister)
 477
 478 #else
 479
 480 /* Trigger has no members */
 481 struct led_trigger {};
 482
 483 /* Trigger inline empty functions */
 484 static inline void led_trigger_register_simple(const char *name,
 485                                         struct led_trigger **trigger) {}
 486 static inline void led_trigger_unregister_simple(struct led_trigger *trigger) {}
 487 static inline void led_trigger_event(struct led_trigger *trigger,
 488                                 enum led_brightness event) {}
 489 static inline void led_trigger_blink(struct led_trigger *trigger,
 490                                       unsigned long *delay_on,
 491                                       unsigned long *delay_off) {}
 492 static inline void led_trigger_blink_oneshot(struct led_trigger *trigger,
 493                                       unsigned long *delay_on,
 494                                       unsigned long *delay_off,
 495                                       int invert) {}
 496 static inline void led_trigger_set_default(struct led_classdev *led_cdev) {}
 497 static inline int led_trigger_set(struct led_classdev *led_cdev,
 498                                   struct led_trigger *trigger)
 499 {
 500         return 0;
 501 }
 502
 503 static inline void led_trigger_remove(struct led_classdev *led_cdev) {}
 504 static inline void led_set_trigger_data(struct led_classdev *led_cdev) {}
 505 static inline void *led_get_trigger_data(struct led_classdev *led_cdev)
 506 {
 507         return NULL;
 508 }
 509
 510 #endif /* CONFIG_LEDS_TRIGGERS */
 511
 512 /* Trigger specific functions */
 513 #ifdef CONFIG_LEDS_TRIGGER_DISK
 514 void ledtrig_disk_activity(bool write);
 515 #else
 516 static inline void ledtrig_disk_activity(bool write) {}
 517 #endif
 518
 519 #ifdef CONFIG_LEDS_TRIGGER_MTD
 520 void ledtrig_mtd_activity(void);
 521 #else
 522 static inline void ledtrig_mtd_activity(void) {}
 523 #endif
 524
 525 #if defined(CONFIG_LEDS_TRIGGER_CAMERA) || defined(CONFIG_LEDS_TRIGGER_CAMERA_MODULE)
 526 void ledtrig_flash_ctrl(bool on);
 527 void ledtrig_torch_ctrl(bool on);
 528 #else
 529 static inline void ledtrig_flash_ctrl(bool on) {}
 530 static inline void ledtrig_torch_ctrl(bool on) {}
 531 #endif
 532
 533 /*
 534  * Generic LED platform data for describing LED names and default triggers.
 535  */
 536 struct led_info {
 537         const char      *name;
 538         const char      *default_trigger;
 539         int             flags;
 540 };
 541
 542 struct led_platform_data {
 543         int             num_leds;
 544         struct led_info *leds;
 545 };
 546
 547 struct led_properties {
 548         u32             color;
 549         bool            color_present;
 550         const char      *function;
 551         u32             func_enum;
 552         bool            func_enum_present;
 553         const char      *label;
 554 };
 555
 556 typedef int (*gpio_blink_set_t)(struct gpio_desc *desc, int state,
 557                                 unsigned long *delay_on,
 558                                 unsigned long *delay_off);
 559
 560 /* For the leds-gpio driver */
 561 struct gpio_led {
 562         const char *name;
 563         const char *default_trigger;
 564         unsigned        gpio;
 565         unsigned        active_low : 1;
 566         unsigned        retain_state_suspended : 1;
 567         unsigned        panic_indicator : 1;
 568         unsigned        default_state : 2;
 569         unsigned        retain_state_shutdown : 1;
 570         /* default_state should be one of LEDS_GPIO_DEFSTATE_(ON|OFF|KEEP) */
 571         struct gpio_desc *gpiod;
 572 };
 573 #define LEDS_GPIO_DEFSTATE_OFF          LEDS_DEFSTATE_OFF
 574 #define LEDS_GPIO_DEFSTATE_ON           LEDS_DEFSTATE_ON
 575 #define LEDS_GPIO_DEFSTATE_KEEP         LEDS_DEFSTATE_KEEP
 576
 577 struct gpio_led_platform_data {
 578         int             num_leds;
 579         const struct gpio_led *leds;
 580
 581 #define GPIO_LED_NO_BLINK_LOW   0       /* No blink GPIO state low */
 582 #define GPIO_LED_NO_BLINK_HIGH  1       /* No blink GPIO state high */
 583 #define GPIO_LED_BLINK          2       /* Please, blink */
 584         gpio_blink_set_t        gpio_blink_set;
 585 };
 586
 587 #ifdef CONFIG_NEW_LEDS
 588 struct platform_device *gpio_led_register_device(
 589                 int id, const struct gpio_led_platform_data *pdata);
 590 #else
 591 static inline struct platform_device *gpio_led_register_device(
 592                 int id, const struct gpio_led_platform_data *pdata)
 593 {
 594         return 0;
 595 }
 596 #endif
 597
 598 enum cpu_led_event {
 599         CPU_LED_IDLE_START,     /* CPU enters idle */
 600         CPU_LED_IDLE_END,       /* CPU idle ends */
 601         CPU_LED_START,          /* Machine starts, especially resume */
 602         CPU_LED_STOP,           /* Machine stops, especially suspend */
 603         CPU_LED_HALTED,         /* Machine shutdown */
 604 };
 605 #ifdef CONFIG_LEDS_TRIGGER_CPU
 606 void ledtrig_cpu(enum cpu_led_event evt);
 607 #else
 608 static inline void ledtrig_cpu(enum cpu_led_event evt)
 609 {
 610         return;
 611 }
 612 #endif
 613
 614 #ifdef CONFIG_LEDS_BRIGHTNESS_HW_CHANGED
 615 void led_classdev_notify_brightness_hw_changed(
 616         struct led_classdev *led_cdev, unsigned int brightness);
 617 #else
 618 static inline void led_classdev_notify_brightness_hw_changed(
 619         struct led_classdev *led_cdev, enum led_brightness brightness) { }
 620 #endif
 621
 622 /**
 623  * struct led_pattern - pattern interval settings
 624  * @delta_t: pattern interval delay, in milliseconds
 625  * @brightness: pattern interval brightness
 626  */
 627 struct led_pattern {
 628         u32 delta_t;
 629         int brightness;
 630 };
 631
 632 enum led_audio {
 633         LED_AUDIO_MUTE,         /* master mute LED */
 634         LED_AUDIO_MICMUTE,      /* mic mute LED */
 635         NUM_AUDIO_LEDS
 636 };
 637
 638 #if IS_ENABLED(CONFIG_LEDS_TRIGGER_AUDIO)
 639 enum led_brightness ledtrig_audio_get(enum led_audio type);
 640 void ledtrig_audio_set(enum led_audio type, enum led_brightness state);
 641 #else
 642 static inline enum led_brightness ledtrig_audio_get(enum led_audio type)
 643 {
 644         return LED_OFF;
 645 }
 646 static inline void ledtrig_audio_set(enum led_audio type,
 647                                      enum led_brightness state)
 648 {
 649 }
 650 #endif
 651
 652 #endif          /* __LINUX_LEDS_H_INCLUDED */