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 20struct attribute_group; 21struct device_node; 22struct fwnode_handle; 23struct gpio_desc; 24struct kernfs_node; 25struct led_pattern; 26struct platform_device; 27 28/* 29 * LED Core 30 */ 31 32/* This is obsolete/useless. We now support variable maximum brightness. */ 33enum led_brightness { 34 LED_OFF = 0, 35 LED_ON = 1, 36 LED_HALF = 127, 37 LED_FULL = 255, 38}; 39 40enum 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 */ 54struct led_lookup_data { 55 struct list_head list; 56 const char *provider; 57 const char *dev_id; 58 const char *con_id; 59}; 60 61struct 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 85enum led_default_state led_init_default_state_get(struct fwnode_handle *fwnode); 86 87struct led_hw_trigger_type { 88 int dummy; 89}; 90 91struct led_classdev { 92 const char *name; 93 unsigned int brightness; 94 unsigned int max_brightness; 95 unsigned int color; 96 int flags; 97 98 /* Lower 16 bits reflect status */ 99#define LED_SUSPENDED BIT(0) 100#define LED_UNREGISTERING BIT(1) 101 /* Upper 16 bits reflect control information */ 102#define LED_CORE_SUSPENDRESUME BIT(16) 103#define LED_SYSFS_DISABLE BIT(17) 104#define LED_DEV_CAP_FLASH BIT(18) 105#define LED_HW_PLUGGABLE BIT(19) 106#define LED_PANIC_INDICATOR BIT(20) 107#define LED_BRIGHT_HW_CHANGED BIT(21) 108#define LED_RETAIN_AT_SHUTDOWN BIT(22) 109#define LED_INIT_DEFAULT_TRIGGER BIT(23) 110 111 /* set_brightness_work / blink_timer flags, atomic, private. */ 112 unsigned long work_flags; 113 114#define LED_BLINK_SW 0 115#define LED_BLINK_ONESHOT 1 116#define LED_BLINK_ONESHOT_STOP 2 117#define LED_BLINK_INVERT 3 118#define LED_BLINK_BRIGHTNESS_CHANGE 4 119#define LED_BLINK_DISABLE 5 120 /* Brightness off also disables hw-blinking so it is a separate action */ 121#define LED_SET_BRIGHTNESS_OFF 6 122#define LED_SET_BRIGHTNESS 7 123#define LED_SET_BLINK 8 124 125 /* Set LED brightness level 126 * Must not sleep. Use brightness_set_blocking for drivers 127 * that can sleep while setting brightness. 128 */ 129 void (*brightness_set)(struct led_classdev *led_cdev, 130 enum led_brightness brightness); 131 /* 132 * Set LED brightness level immediately - it can block the caller for 133 * the time required for accessing a LED device register. 134 */ 135 int (*brightness_set_blocking)(struct led_classdev *led_cdev, 136 enum led_brightness brightness); 137 /* Get LED brightness level */ 138 enum led_brightness (*brightness_get)(struct led_classdev *led_cdev); 139 140 /* 141 * Activate hardware accelerated blink, delays are in milliseconds 142 * and if both are zero then a sensible default should be chosen. 143 * The call should adjust the timings in that case and if it can't 144 * match the values specified exactly. 145 * Deactivate blinking again when the brightness is set to LED_OFF 146 * via the brightness_set() callback. 147 * For led_blink_set_nosleep() the LED core assumes that blink_set 148 * implementations, of drivers which do not use brightness_set_blocking, 149 * will not sleep. Therefor if brightness_set_blocking is not set 150 * this function must not sleep! 151 */ 152 int (*blink_set)(struct led_classdev *led_cdev, 153 unsigned long *delay_on, 154 unsigned long *delay_off); 155 156 int (*pattern_set)(struct led_classdev *led_cdev, 157 struct led_pattern *pattern, u32 len, int repeat); 158 int (*pattern_clear)(struct led_classdev *led_cdev); 159 160 struct device *dev; 161 const struct attribute_group **groups; 162 163 struct list_head node; /* LED Device list */ 164 const char *default_trigger; /* Trigger to use */ 165 166 unsigned long blink_delay_on, blink_delay_off; 167 struct timer_list blink_timer; 168 int blink_brightness; 169 int new_blink_brightness; 170 void (*flash_resume)(struct led_classdev *led_cdev); 171 172 struct work_struct set_brightness_work; 173 int delayed_set_value; 174 unsigned long delayed_delay_on; 175 unsigned long delayed_delay_off; 176 177#ifdef CONFIG_LEDS_TRIGGERS 178 /* Protects the trigger data below */ 179 struct rw_semaphore trigger_lock; 180 181 struct led_trigger *trigger; 182 struct list_head trig_list; 183 void *trigger_data; 184 /* true if activated - deactivate routine uses it to do cleanup */ 185 bool activated; 186 187 /* LEDs that have private triggers have this set */ 188 struct led_hw_trigger_type *trigger_type; 189 190 /* Unique trigger name supported by LED set in hw control mode */ 191 const char *hw_control_trigger; 192 /* 193 * Check if the LED driver supports the requested mode provided by the 194 * defined supported trigger to setup the LED to hw control mode. 195 * 196 * Return 0 on success. Return -EOPNOTSUPP when the passed flags are not 197 * supported and software fallback needs to be used. 198 * Return a negative error number on any other case for check fail due 199 * to various reason like device not ready or timeouts. 200 */ 201 int (*hw_control_is_supported)(struct led_classdev *led_cdev, 202 unsigned long flags); 203 /* 204 * Activate hardware control, LED driver will use the provided flags 205 * from the supported trigger and setup the LED to be driven by hardware 206 * following the requested mode from the trigger flags. 207 * Deactivate hardware blink control by setting brightness to LED_OFF via 208 * the brightness_set() callback. 209 * 210 * Return 0 on success, a negative error number on flags apply fail. 211 */ 212 int (*hw_control_set)(struct led_classdev *led_cdev, 213 unsigned long flags); 214 /* 215 * Get from the LED driver the current mode that the LED is set in hw 216 * control mode and put them in flags. 217 * Trigger can use this to get the initial state of a LED already set in 218 * hardware blink control. 219 * 220 * Return 0 on success, a negative error number on failing parsing the 221 * initial mode. Error from this function is NOT FATAL as the device 222 * may be in a not supported initial state by the attached LED trigger. 223 */ 224 int (*hw_control_get)(struct led_classdev *led_cdev, 225 unsigned long *flags); 226 /* 227 * Get the device this LED blinks in response to. 228 * e.g. for a PHY LED, it is the network device. If the LED is 229 * not yet associated to a device, return NULL. 230 */ 231 struct device *(*hw_control_get_device)(struct led_classdev *led_cdev); 232#endif 233 234#ifdef CONFIG_LEDS_BRIGHTNESS_HW_CHANGED 235 int brightness_hw_changed; 236 struct kernfs_node *brightness_hw_changed_kn; 237#endif 238 239 /* Ensures consistent access to the LED Flash Class device */ 240 struct mutex led_access; 241}; 242 243/** 244 * led_classdev_register_ext - register a new object of LED class with 245 * init data 246 * @parent: LED controller device this LED is driven by 247 * @led_cdev: the led_classdev structure for this device 248 * @init_data: the LED class device initialization data 249 * 250 * Register a new object of LED class, with name derived from init_data. 251 * 252 * Returns: 0 on success or negative error value on failure 253 */ 254int led_classdev_register_ext(struct device *parent, 255 struct led_classdev *led_cdev, 256 struct led_init_data *init_data); 257 258/** 259 * led_classdev_register - register a new object of LED class 260 * @parent: LED controller device this LED is driven by 261 * @led_cdev: the led_classdev structure for this device 262 * 263 * Register a new object of LED class, with name derived from the name property 264 * of passed led_cdev argument. 265 * 266 * Returns: 0 on success or negative error value on failure 267 */ 268static inline int led_classdev_register(struct device *parent, 269 struct led_classdev *led_cdev) 270{ 271 return led_classdev_register_ext(parent, led_cdev, NULL); 272} 273 274int devm_led_classdev_register_ext(struct device *parent, 275 struct led_classdev *led_cdev, 276 struct led_init_data *init_data); 277static inline int devm_led_classdev_register(struct device *parent, 278 struct led_classdev *led_cdev) 279{ 280 return devm_led_classdev_register_ext(parent, led_cdev, NULL); 281} 282void led_classdev_unregister(struct led_classdev *led_cdev); 283void devm_led_classdev_unregister(struct device *parent, 284 struct led_classdev *led_cdev); 285void led_classdev_suspend(struct led_classdev *led_cdev); 286void led_classdev_resume(struct led_classdev *led_cdev); 287 288void led_add_lookup(struct led_lookup_data *led_lookup); 289void led_remove_lookup(struct led_lookup_data *led_lookup); 290 291struct led_classdev *__must_check led_get(struct device *dev, char *con_id); 292struct led_classdev *__must_check devm_led_get(struct device *dev, char *con_id); 293 294extern struct led_classdev *of_led_get(struct device_node *np, int index); 295extern void led_put(struct led_classdev *led_cdev); 296struct led_classdev *__must_check devm_of_led_get(struct device *dev, 297 int index); 298struct led_classdev *__must_check devm_of_led_get_optional(struct device *dev, 299 int index); 300 301/** 302 * led_blink_set - set blinking with software fallback 303 * @led_cdev: the LED to start blinking 304 * @delay_on: the time it should be on (in ms) 305 * @delay_off: the time it should ble off (in ms) 306 * 307 * This function makes the LED blink, attempting to use the 308 * hardware acceleration if possible, but falling back to 309 * software blinking if there is no hardware blinking or if 310 * the LED refuses the passed values. 311 * 312 * This function may sleep! 313 * 314 * Note that if software blinking is active, simply calling 315 * led_cdev->brightness_set() will not stop the blinking, 316 * use led_set_brightness() instead. 317 */ 318void led_blink_set(struct led_classdev *led_cdev, unsigned long *delay_on, 319 unsigned long *delay_off); 320 321/** 322 * led_blink_set_nosleep - set blinking, guaranteed to not sleep 323 * @led_cdev: the LED to start blinking 324 * @delay_on: the time it should be on (in ms) 325 * @delay_off: the time it should ble off (in ms) 326 * 327 * This function makes the LED blink and is guaranteed to not sleep. Otherwise 328 * this is the same as led_blink_set(), see led_blink_set() for details. 329 */ 330void led_blink_set_nosleep(struct led_classdev *led_cdev, unsigned long delay_on, 331 unsigned long delay_off); 332 333/** 334 * led_blink_set_oneshot - do a oneshot software blink 335 * @led_cdev: the LED to start blinking 336 * @delay_on: the time it should be on (in ms) 337 * @delay_off: the time it should ble off (in ms) 338 * @invert: blink off, then on, leaving the led on 339 * 340 * This function makes the LED blink one time for delay_on + 341 * delay_off time, ignoring the request if another one-shot 342 * blink is already in progress. 343 * 344 * If invert is set, led blinks for delay_off first, then for 345 * delay_on and leave the led on after the on-off cycle. 346 * 347 * This function is guaranteed not to sleep. 348 */ 349void led_blink_set_oneshot(struct led_classdev *led_cdev, 350 unsigned long *delay_on, unsigned long *delay_off, 351 int invert); 352/** 353 * led_set_brightness - set LED brightness 354 * @led_cdev: the LED to set 355 * @brightness: the brightness to set it to 356 * 357 * Set an LED's brightness, and, if necessary, cancel the 358 * software blink timer that implements blinking when the 359 * hardware doesn't. This function is guaranteed not to sleep. 360 */ 361void led_set_brightness(struct led_classdev *led_cdev, unsigned int brightness); 362 363/** 364 * led_set_brightness_sync - set LED brightness synchronously 365 * @led_cdev: the LED to set 366 * @value: the brightness to set it to 367 * 368 * Set an LED's brightness immediately. This function will block 369 * the caller for the time required for accessing device registers, 370 * and it can sleep. 371 * 372 * Returns: 0 on success or negative error value on failure 373 */ 374int led_set_brightness_sync(struct led_classdev *led_cdev, unsigned int value); 375 376/** 377 * led_update_brightness - update LED brightness 378 * @led_cdev: the LED to query 379 * 380 * Get an LED's current brightness and update led_cdev->brightness 381 * member with the obtained value. 382 * 383 * Returns: 0 on success or negative error value on failure 384 */ 385int led_update_brightness(struct led_classdev *led_cdev); 386 387/** 388 * led_get_default_pattern - return default pattern 389 * 390 * @led_cdev: the LED to get default pattern for 391 * @size: pointer for storing the number of elements in returned array, 392 * modified only if return != NULL 393 * 394 * Return: Allocated array of integers with default pattern from device tree 395 * or NULL. Caller is responsible for kfree(). 396 */ 397u32 *led_get_default_pattern(struct led_classdev *led_cdev, unsigned int *size); 398 399/** 400 * led_sysfs_disable - disable LED sysfs interface 401 * @led_cdev: the LED to set 402 * 403 * Disable the led_cdev's sysfs interface. 404 */ 405void led_sysfs_disable(struct led_classdev *led_cdev); 406 407/** 408 * led_sysfs_enable - enable LED sysfs interface 409 * @led_cdev: the LED to set 410 * 411 * Enable the led_cdev's sysfs interface. 412 */ 413void led_sysfs_enable(struct led_classdev *led_cdev); 414 415/** 416 * led_compose_name - compose LED class device name 417 * @dev: LED controller device object 418 * @init_data: the LED class device initialization data 419 * @led_classdev_name: composed LED class device name 420 * 421 * Create LED class device name basing on the provided init_data argument. 422 * The name can have <devicename:color:function> or <color:function>. 423 * form, depending on the init_data configuration. 424 * 425 * Returns: 0 on success or negative error value on failure 426 */ 427int led_compose_name(struct device *dev, struct led_init_data *init_data, 428 char *led_classdev_name); 429 430/** 431 * led_sysfs_is_disabled - check if LED sysfs interface is disabled 432 * @led_cdev: the LED to query 433 * 434 * Returns: true if the led_cdev's sysfs interface is disabled. 435 */ 436static inline bool led_sysfs_is_disabled(struct led_classdev *led_cdev) 437{ 438 return led_cdev->flags & LED_SYSFS_DISABLE; 439} 440 441/* 442 * LED Triggers 443 */ 444/* Registration functions for simple triggers */ 445#define DEFINE_LED_TRIGGER(x) static struct led_trigger *x; 446#define DEFINE_LED_TRIGGER_GLOBAL(x) struct led_trigger *x; 447 448#ifdef CONFIG_LEDS_TRIGGERS 449 450#define TRIG_NAME_MAX 50 451 452struct led_trigger { 453 /* Trigger Properties */ 454 const char *name; 455 int (*activate)(struct led_classdev *led_cdev); 456 void (*deactivate)(struct led_classdev *led_cdev); 457 458 /* LED-private triggers have this set */ 459 struct led_hw_trigger_type *trigger_type; 460 461 /* LEDs under control by this trigger (for simple triggers) */ 462 spinlock_t leddev_list_lock; 463 struct list_head led_cdevs; 464 465 /* Link to next registered trigger */ 466 struct list_head next_trig; 467 468 const struct attribute_group **groups; 469}; 470 471/* 472 * Currently the attributes in struct led_trigger::groups are added directly to 473 * the LED device. As this might change in the future, the following 474 * macros abstract getting the LED device and its trigger_data from the dev 475 * parameter passed to the attribute accessor functions. 476 */ 477#define led_trigger_get_led(dev) ((struct led_classdev *)dev_get_drvdata((dev))) 478#define led_trigger_get_drvdata(dev) (led_get_trigger_data(led_trigger_get_led(dev))) 479 480/* Registration functions for complex triggers */ 481int led_trigger_register(struct led_trigger *trigger); 482void led_trigger_unregister(struct led_trigger *trigger); 483int devm_led_trigger_register(struct device *dev, 484 struct led_trigger *trigger); 485 486void led_trigger_register_simple(const char *name, 487 struct led_trigger **trigger); 488void led_trigger_unregister_simple(struct led_trigger *trigger); 489void led_trigger_event(struct led_trigger *trigger, enum led_brightness event); 490void led_trigger_blink(struct led_trigger *trigger, unsigned long delay_on, 491 unsigned long delay_off); 492void led_trigger_blink_oneshot(struct led_trigger *trigger, 493 unsigned long delay_on, 494 unsigned long delay_off, 495 int invert); 496void led_trigger_set_default(struct led_classdev *led_cdev); 497int led_trigger_set(struct led_classdev *led_cdev, struct led_trigger *trigger); 498void led_trigger_remove(struct led_classdev *led_cdev); 499 500static inline void led_set_trigger_data(struct led_classdev *led_cdev, 501 void *trigger_data) 502{ 503 led_cdev->trigger_data = trigger_data; 504} 505 506static inline void *led_get_trigger_data(struct led_classdev *led_cdev) 507{ 508 return led_cdev->trigger_data; 509} 510 511#define module_led_trigger(__led_trigger) \ 512 module_driver(__led_trigger, led_trigger_register, \ 513 led_trigger_unregister) 514 515#else 516 517/* Trigger has no members */ 518struct led_trigger {}; 519 520/* Trigger inline empty functions */ 521static inline void led_trigger_register_simple(const char *name, 522 struct led_trigger **trigger) {} 523static inline void led_trigger_unregister_simple(struct led_trigger *trigger) {} 524static inline void led_trigger_event(struct led_trigger *trigger, 525 enum led_brightness event) {} 526static inline void led_trigger_blink(struct led_trigger *trigger, 527 unsigned long delay_on, 528 unsigned long delay_off) {} 529static inline void led_trigger_blink_oneshot(struct led_trigger *trigger, 530 unsigned long delay_on, 531 unsigned long delay_off, 532 int invert) {} 533static inline void led_trigger_set_default(struct led_classdev *led_cdev) {} 534static inline int led_trigger_set(struct led_classdev *led_cdev, 535 struct led_trigger *trigger) 536{ 537 return 0; 538} 539 540static inline void led_trigger_remove(struct led_classdev *led_cdev) {} 541static inline void led_set_trigger_data(struct led_classdev *led_cdev) {} 542static inline void *led_get_trigger_data(struct led_classdev *led_cdev) 543{ 544 return NULL; 545} 546 547#endif /* CONFIG_LEDS_TRIGGERS */ 548 549/* Trigger specific enum */ 550enum led_trigger_netdev_modes { 551 TRIGGER_NETDEV_LINK = 0, 552 TRIGGER_NETDEV_LINK_10, 553 TRIGGER_NETDEV_LINK_100, 554 TRIGGER_NETDEV_LINK_1000, 555 TRIGGER_NETDEV_LINK_2500, 556 TRIGGER_NETDEV_LINK_5000, 557 TRIGGER_NETDEV_LINK_10000, 558 TRIGGER_NETDEV_HALF_DUPLEX, 559 TRIGGER_NETDEV_FULL_DUPLEX, 560 TRIGGER_NETDEV_TX, 561 TRIGGER_NETDEV_RX, 562 563 /* Keep last */ 564 __TRIGGER_NETDEV_MAX, 565}; 566 567/* Trigger specific functions */ 568#ifdef CONFIG_LEDS_TRIGGER_DISK 569void ledtrig_disk_activity(bool write); 570#else 571static inline void ledtrig_disk_activity(bool write) {} 572#endif 573 574#ifdef CONFIG_LEDS_TRIGGER_MTD 575void ledtrig_mtd_activity(void); 576#else 577static inline void ledtrig_mtd_activity(void) {} 578#endif 579 580#if defined(CONFIG_LEDS_TRIGGER_CAMERA) || defined(CONFIG_LEDS_TRIGGER_CAMERA_MODULE) 581void ledtrig_flash_ctrl(bool on); 582void ledtrig_torch_ctrl(bool on); 583#else 584static inline void ledtrig_flash_ctrl(bool on) {} 585static inline void ledtrig_torch_ctrl(bool on) {} 586#endif 587 588/* 589 * Generic LED platform data for describing LED names and default triggers. 590 */ 591struct led_info { 592 const char *name; 593 const char *default_trigger; 594 int flags; 595}; 596 597struct led_platform_data { 598 int num_leds; 599 struct led_info *leds; 600}; 601 602struct led_properties { 603 u32 color; 604 bool color_present; 605 const char *function; 606 u32 func_enum; 607 bool func_enum_present; 608 const char *label; 609}; 610 611typedef int (*gpio_blink_set_t)(struct gpio_desc *desc, int state, 612 unsigned long *delay_on, 613 unsigned long *delay_off); 614 615/* For the leds-gpio driver */ 616struct gpio_led { 617 const char *name; 618 const char *default_trigger; 619 unsigned gpio; 620 unsigned active_low : 1; 621 unsigned retain_state_suspended : 1; 622 unsigned panic_indicator : 1; 623 unsigned default_state : 2; 624 unsigned retain_state_shutdown : 1; 625 /* default_state should be one of LEDS_GPIO_DEFSTATE_(ON|OFF|KEEP) */ 626 struct gpio_desc *gpiod; 627}; 628#define LEDS_GPIO_DEFSTATE_OFF LEDS_DEFSTATE_OFF 629#define LEDS_GPIO_DEFSTATE_ON LEDS_DEFSTATE_ON 630#define LEDS_GPIO_DEFSTATE_KEEP LEDS_DEFSTATE_KEEP 631 632struct gpio_led_platform_data { 633 int num_leds; 634 const struct gpio_led *leds; 635 636#define GPIO_LED_NO_BLINK_LOW 0 /* No blink GPIO state low */ 637#define GPIO_LED_NO_BLINK_HIGH 1 /* No blink GPIO state high */ 638#define GPIO_LED_BLINK 2 /* Please, blink */ 639 gpio_blink_set_t gpio_blink_set; 640}; 641 642#ifdef CONFIG_LEDS_GPIO_REGISTER 643struct platform_device *gpio_led_register_device( 644 int id, const struct gpio_led_platform_data *pdata); 645#else 646static inline struct platform_device *gpio_led_register_device( 647 int id, const struct gpio_led_platform_data *pdata) 648{ 649 return 0; 650} 651#endif 652 653enum cpu_led_event { 654 CPU_LED_IDLE_START, /* CPU enters idle */ 655 CPU_LED_IDLE_END, /* CPU idle ends */ 656 CPU_LED_START, /* Machine starts, especially resume */ 657 CPU_LED_STOP, /* Machine stops, especially suspend */ 658 CPU_LED_HALTED, /* Machine shutdown */ 659}; 660#ifdef CONFIG_LEDS_TRIGGER_CPU 661void ledtrig_cpu(enum cpu_led_event evt); 662#else 663static inline void ledtrig_cpu(enum cpu_led_event evt) 664{ 665 return; 666} 667#endif 668 669#ifdef CONFIG_LEDS_BRIGHTNESS_HW_CHANGED 670void led_classdev_notify_brightness_hw_changed( 671 struct led_classdev *led_cdev, unsigned int brightness); 672#else 673static inline void led_classdev_notify_brightness_hw_changed( 674 struct led_classdev *led_cdev, enum led_brightness brightness) { } 675#endif 676 677/** 678 * struct led_pattern - pattern interval settings 679 * @delta_t: pattern interval delay, in milliseconds 680 * @brightness: pattern interval brightness 681 */ 682struct led_pattern { 683 u32 delta_t; 684 int brightness; 685}; 686 687enum led_audio { 688 LED_AUDIO_MUTE, /* master mute LED */ 689 LED_AUDIO_MICMUTE, /* mic mute LED */ 690 NUM_AUDIO_LEDS 691}; 692 693#if IS_ENABLED(CONFIG_LEDS_TRIGGER_AUDIO) 694enum led_brightness ledtrig_audio_get(enum led_audio type); 695void ledtrig_audio_set(enum led_audio type, enum led_brightness state); 696#else 697static inline enum led_brightness ledtrig_audio_get(enum led_audio type) 698{ 699 return LED_OFF; 700} 701static inline void ledtrig_audio_set(enum led_audio type, 702 enum led_brightness state) 703{ 704} 705#endif 706 707#endif /* __LINUX_LEDS_H_INCLUDED */ 708