1 # SPDX-License-Identifier: GPL-2.0-only 2 menuconfig LEDS_TRIGGERS 3 bool "LED Trigger support" 4 depends on LEDS_CLASS 5 help 6 This option enables trigger support for the leds class. 7 These triggers allow kernel events to drive the LEDs and can 8 be configured via sysfs. If unsure, say Y. 9 10 if LEDS_TRIGGERS 11 12 config LEDS_TRIGGER_TIMER 13 tristate "LED Timer Trigger" 14 help 15 This allows LEDs to be controlled by a programmable timer 16 via sysfs. Some LED hardware can be programmed to start 17 blinking the LED without any further software interaction. 18 For more details read Documentation/leds/leds-class.rst. 19 20 If unsure, say Y. 21 22 config LEDS_TRIGGER_ONESHOT 23 tristate "LED One-shot Trigger" 24 help 25 This allows LEDs to blink in one-shot pulses with parameters 26 controlled via sysfs. It's useful to notify the user on 27 sporadic events, when there are no clear begin and end trap points, 28 or on dense events, where this blinks the LED at constant rate if 29 rearmed continuously. 30 31 It also shows how to use the led_blink_set_oneshot() function. 32 33 If unsure, say Y. 34 35 config LEDS_TRIGGER_DISK 36 bool "LED Disk Trigger" 37 depends on ATA 38 help 39 This allows LEDs to be controlled by disk activity. 40 If unsure, say Y. 41 42 config LEDS_TRIGGER_MTD 43 bool "LED MTD (NAND/NOR) Trigger" 44 depends on MTD 45 help 46 This allows LEDs to be controlled by MTD activity. 47 If unsure, say N. 48 49 config LEDS_TRIGGER_HEARTBEAT 50 tristate "LED Heartbeat Trigger" 51 help 52 This allows LEDs to be controlled by a CPU load average. 53 The flash frequency is a hyperbolic function of the 1-minute 54 load average. 55 If unsure, say Y. 56 57 config LEDS_TRIGGER_BACKLIGHT 58 tristate "LED backlight Trigger" 59 help 60 This allows LEDs to be controlled as a backlight device: they 61 turn off and on when the display is blanked and unblanked. 62 63 If unsure, say N. 64 65 config LEDS_TRIGGER_CPU 66 bool "LED CPU Trigger" 67 depends on !PREEMPT_RT 68 help 69 This allows LEDs to be controlled by active CPUs. This shows 70 the active CPUs across an array of LEDs so you can see which 71 CPUs are active on the system at any given moment. 72 73 If unsure, say N. 74 75 config LEDS_TRIGGER_ACTIVITY 76 tristate "LED activity Trigger" 77 help 78 This allows LEDs to be controlled by an immediate CPU usage. 79 The flash frequency and duty cycle varies from faint flashes to 80 intense brightness depending on the instant CPU load. 81 If unsure, say N. 82 83 config LEDS_TRIGGER_GPIO 84 tristate "LED GPIO Trigger" 85 depends on GPIOLIB || COMPILE_TEST 86 help 87 This allows LEDs to be controlled by gpio events. It's good 88 when using gpios as switches and triggering the needed LEDs 89 from there. Triggers are defined as device properties. 90 91 If unsure, say N. 92 93 config LEDS_TRIGGER_DEFAULT_ON 94 tristate "LED Default ON Trigger" 95 help 96 This allows LEDs to be initialised in the ON state. 97 If unsure, say Y. 98 99 comment "iptables trigger is under Netfilter config (LED target)" 100 depends on LEDS_TRIGGERS 101 102 config LEDS_TRIGGER_TRANSIENT 103 tristate "LED Transient Trigger" 104 help 105 This allows one time activation of a transient state on 106 GPIO/PWM based hardware. 107 If unsure, say Y. 108 109 config LEDS_TRIGGER_CAMERA 110 tristate "LED Camera Flash/Torch Trigger" 111 help 112 This allows LEDs to be controlled as a camera flash/torch device. 113 This enables direct flash/torch on/off by the driver, kernel space. 114 If unsure, say Y. 115 116 config LEDS_TRIGGER_PANIC 117 bool "LED Panic Trigger" 118 help 119 This allows LEDs to be configured to blink on a kernel panic. 120 Enabling this option will allow to mark certain LEDs as panic indicators, 121 allowing to blink them on a kernel panic, even if they are set to 122 a different trigger. 123 If unsure, say Y. 124 125 config LEDS_TRIGGER_NETDEV 126 tristate "LED Netdev Trigger" 127 depends on NET 128 help 129 This allows LEDs to be controlled by network device activity. 130 If unsure, say Y. 131 132 config LEDS_TRIGGER_PATTERN 133 tristate "LED Pattern Trigger" 134 help 135 This allows LEDs to be controlled by a software or hardware pattern 136 which is a series of tuples, of brightness and duration (ms). 137 If unsure, say N 138 139 config LEDS_TRIGGER_TTY 140 tristate "LED Trigger for TTY devices" 141 depends on TTY 142 help 143 This allows LEDs to be controlled by activity on ttys which includes 144 serial devices like /dev/ttyS0. 145 146 When build as a module this driver will be called ledtrig-tty. 147 148 config LEDS_TRIGGER_INPUT_EVENTS 149 tristate "LED Input events trigger" 150 depends on INPUT 151 help 152 Turn LEDs on when there is input (/dev/input/event*) activity and turn 153 them back off again after there has been no activity for 5 seconds. 154 155 This is primarily intended to control LEDs which are a backlight for 156 capacitive touch-buttons, such as e.g. the menu / home / back buttons 157 found on the bottom bezel of many older smartphones and tablets. 158 159 This can also be used to turn on the keyboard backlight LED on 160 input events and turn the keyboard backlight off again when idle. 161 162 When build as a module this driver will be called ledtrig-input-events. 163 164 endif # LEDS_TRIGGERS 165