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/linux/Documentation/ABI/testing/
H A Dsysfs-class-backlight1 What: /sys/class/backlight/<backlight>/scale
28 What: /sys/class/backlight/<backlight>/ambient_light_level
49 What: /sys/class/backlight/<backlight>/ambient_light_zone
57 backlight operates.
64 0 Off: Backlight set to 0 mA
73 0 Off: Backlight set to 0 mA
85 /sys/class/backlight/<backlight>/max_brightness to
86 /sys/class/backlight/<backlight>/brightness.
88 What: /sys/class/backlight/<backlight>/<ambient light zone>_max
94 on this <backlight>. Values are between 0 and 127. This file
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H A Dsysfs-class-backlight-driver-lm35331 What: /sys/class/backlight/<backlight>/als_channel
10 0 out_current0 (backlight 0)
11 1 out_current1 (backlight 1)
14 What: /sys/class/backlight/<backlight>/als_en
21 What: /sys/class/backlight/<backlight>/id
26 Get the id of this backlight (0, 1).
28 What: /sys/class/backlight/<backlight>/linear
40 What: /sys/class/backlight/<backlight>/pwm
H A Dsysfs-class-backlight-lm36391 sysfs interface for Texas Instruments lm3639 backlight + flash led driver chip
4 What: /sys/class/backlight/<backlight>/bled_mode
9 (WO) Write to the backlight mapping mode. The backlight current
/linux/drivers/video/backlight/
H A Dbacklight.c3 * Backlight Lowlevel Control Abstraction
14 #include <linux/backlight.h>
22 #include <asm/backlight.h>
28 * The backlight core supports implementing backlight drivers.
30 * A backlight driver registers a driver using
31 * devm_backlight_device_register(). The properties of the backlight
34 * the update_status() operation is called. The backlight driver shall
35 * implement this operation and use it to adjust backlight.
37 * Several sysfs attributes are provided by the backlight core::
43 * See Documentation/ABI/stable/sysfs-class-backlight for the full list.
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H A Dipaq_micro_bl.c4 * iPAQ microcontroller backlight support
8 #include <linux/backlight.h>
26 * Byte 0: backlight instance (usually 1) in micro_bl_update_status()
53 bd = devm_backlight_device_register(&pdev->dev, "ipaq-micro-backlight", in micro_backlight_probe()
67 .name = "ipaq-micro-backlight",
74 MODULE_DESCRIPTION("driver for iPAQ Atmel micro backlight");
75 MODULE_ALIAS("platform:ipaq-micro-backlight");
/linux/Documentation/devicetree/bindings/leds/backlight/
H A Dmediatek,mt6370-backlight.yaml4 $id: http://devicetree.org/schemas/leds/backlight/mediatek,mt6370-backlight.yaml#
7 title: MediaTek MT6370 Backlight
14 The MT6370 Backlight WLED driver supports up to a 29V output voltage for
26 - mediatek,mt6370-backlight
27 - mediatek,mt6372-backlight
36 description: External backlight 'enable' pin
41 Enable external PWM input for backlight dimming
46 Enable the backlight input-hysteresis for PWM mode
53 The selection of the upper and lower bounds threshold of backlight
59 Enable the backlight shutdown when OVP level triggered
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H A Dpwm-backlight.yaml4 $id: http://devicetree.org/schemas/leds/backlight/pwm-backlight.yaml#
7 title: pwm-backlight
19 const: pwm-backlight
32 the backlight.
38 backlight using GPIO.
42 Delay in ms between disabling the backlight using GPIO and setting PWM
64 backlight {
65 compatible = "pwm-backlight";
79 backlight {
80 compatible = "pwm-backlight";
H A Drichtek,rt4831-backlight.yaml4 $id: http://devicetree.org/schemas/leds/backlight/richtek,rt4831-backlight.yaml#
7 title: Richtek RT4831 Backlight
14 and LCD backlight.
16 For the LCD backlight, it can provide four channel WLED driving capability.
27 const: richtek,rt4831-backlight
39 Specify the backlight dimming following by PWM duty or by SW control.
44 Backlight OVP level selection, currently support 17V/21V/25V/29V.
52 Backlight over current protection level.
57 Backlight LED channel to be used.
H A Dgpio-backlight.yaml4 $id: http://devicetree.org/schemas/leds/backlight/gpio-backlight.yaml#
7 title: gpio-backlight
16 const: gpio-backlight
19 description: The gpio that is used for enabling/disabling the backlight.
23 description: enable the backlight at boot.
35 backlight {
36 compatible = "gpio-backlight";
H A Dzii,rave-sp-backlight.yaml4 $id: http://devicetree.org/schemas/leds/backlight/zii,rave-sp-backlight.yaml#
7 title: Zodiac Inflight Innovations RAVE Supervisory Processor Backlight
13 RAVE SP backlight device is a "MFD cell" device corresponding to
14 backlight functionality of RAVE Supervisory Processor. It is expected
21 const: zii,rave-sp-backlight
33 backlight {
34 compatible = "zii,rave-sp-backlight";
H A Dsky81452-backlight.txt1 SKY81452-backlight bindings
4 - compatible : Must be "skyworks,sky81452-backlight"
7 - name : Name of backlight device. Default is 'lcd-backlight'.
22 backlight {
23 compatible = "skyworks,sky81452-backlight";
24 name = "pwm-backlight";
H A Dkinetic,ktd253.yaml4 $id: http://devicetree.org/schemas/leds/backlight/kinetic,ktd253.yaml#
7 title: Kinetic Technologies KTD253 and KTD259 one-wire backlight
14 controlled by a single GPIO line. If you just turn on the backlight
15 it goes to maximum backlight then you can set the level of backlight
30 description: GPIO to use to enable/disable and dim the backlight.
45 backlight {
H A Dlp855x-backlight.yaml4 $id: http://devicetree.org/schemas/leds/backlight/lp855x-backlight.yaml#
7 title: Texas Instruments LP855X backlight controllers
33 description: Backlight device name.
37 description: Initial value of backlight brightness.
48 PWM channel to use for controlling the backlight; setting this
49 enables the PWM-based backlight control mode.
87 backlight@2c {
120 backlight@2c {
134 backlight@2c {
H A D88pm860x.txt1 88pm860x-backlight bindings
4 - marvell,88pm860x-iset: Current supplies on backlight device.
5 - marvell,88pm860x-pwm: PWM frequency on backlight device.
10 backlight-0 {
14 backlight-2 {
/linux/Documentation/devicetree/bindings/mfd/
H A Dti-lmu.txt7 LM3631 Backlight and regulator
8 LM3632 Backlight and regulator
9 LM3633 Backlight, LED and fault monitor
10 LM3695 Backlight
11 LM36274 Backlight and regulator
47 - backlight: All LMU devices have backlight child nodes.
60 [1] ../leds/backlight/ti-lmu-backlight.txt
106 backlight {
107 compatible = "ti,lm3631-backlight";
148 backlight {
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H A Dsky81452.txt8 - backlight : container node for backlight following the binding
9 in leds/backlight/sky81452-backlight.txt
19 backlight {
20 compatible = "skyworks,sky81452-backlight";
21 name = "pwm-backlight";
/linux/tools/arch/x86/dell-uart-backlight-emulator/
H A DREADME1 Emulator for DELL0501 UART attached backlight controller
4 Dell All In One (AIO) models released after 2017 use a backlight controller
13 the backlight controller board attached.
16 the drivers/platform/x86/dell/dell-uart-backlight.c driver without access
32 ./dell-uart-backlight-emulator <path-to-/dev/tty*S#-for-second-port>
36 ./dell-uart-backlight-emulator /dev/ttyUSB0
38 And then (re)load the dell-uart-backlight driver:
40 sudo rmmod dell-uart-backlight; sudo modprobe dell-uart-backlight dyndbg
44 should be a /sys/class/backlight/dell_uart_backlight/ directory now
H A DMakefile4 dell-uart-backlight-emulator: dell-uart-backlight-emulator.c
15 @rm -f dell-uart-backlight-emulator
17 install : dell-uart-backlight-emulator
19 install -m 755 -p dell-uart-backlight-emulator $(DESTDIR)$(BINDIR)/dell-uart-backlight-emulator
/linux/Documentation/firmware-guide/acpi/
H A Dvideo_extension.rst14 The ACPI video driver does 3 things regarding backlight control.
16 Export a sysfs interface for user space to control backlight level
20 command line is not present, the driver will register a backlight device
21 and set the required backlight operation structure for it for the sysfs
23 directory named acpi_videoX under /sys/class/backlight.
25 The backlight sysfs interface has a standard definition here:
26 Documentation/ABI/stable/sysfs-class-backlight.
42 Note that ACPI video backlight driver will always use index for
108 Once user space tool receives this event, it can modify the backlight
111 Change backlight level in the kernel
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/linux/drivers/hid/
H A Dhid-picolcd_backlight.c12 #include <linux/backlight.h>
66 dev_err(dev, "failed to register backlight\n"); in picolcd_init_backlight()
71 data->backlight = bdev; in picolcd_init_backlight()
78 struct backlight_device *bdev = data->backlight; in picolcd_exit_backlight()
80 data->backlight = NULL; in picolcd_exit_backlight()
86 if (!data->backlight) in picolcd_resume_backlight()
88 return picolcd_set_brightness(data->backlight); in picolcd_resume_backlight()
95 if (!data->backlight) in picolcd_suspend_backlight()
98 data->backlight->props.power = BACKLIGHT_POWER_OFF; in picolcd_suspend_backlight()
99 picolcd_set_brightness(data->backlight); in picolcd_suspend_backlight()
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H A Dhid-corsair.c43 struct k90_led *backlight; member
142 #define K90_BACKLIGHT_LED_SUFFIX "::backlight"
173 "Read invalid backlight brightness: %02hhx.\n", in k90_backlight_get()
222 dev_warn(dev, "Failed to set backlight brightness (error: %d).\n", in k90_backlight_work()
430 drvdata->backlight = kzalloc_obj(struct k90_led); in k90_init_backlight()
431 if (!drvdata->backlight) { in k90_init_backlight()
445 drvdata->backlight->removed = false; in k90_init_backlight()
446 drvdata->backlight->cdev.name = name; in k90_init_backlight()
447 drvdata->backlight->cdev.max_brightness = 3; in k90_init_backlight()
448 drvdata->backlight->cdev.brightness_set = k90_brightness_set; in k90_init_backlight()
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/linux/drivers/platform/x86/
H A Dmsi-wmi.c16 #include <linux/backlight.h>
85 static struct backlight_device *backlight; variable
137 /* Instance 1 is "get backlight", cmp with DSDT */ in bl_get()
140 pr_err("Could not query backlight: %d\n", err); in bl_get()
146 pr_debug("Current backlight level: 0x%X - index: %d\n", in bl_get()
164 /* Instance 0 is "set backlight" */ in bl_set_status()
203 (backlight || in msi_wmi_notify()
223 backlight = backlight_device_register(DRV_NAME, NULL, NULL, in msi_wmi_backlight_setup()
226 if (IS_ERR(backlight)) in msi_wmi_backlight_setup()
227 return PTR_ERR(backlight); in msi_wmi_backlight_setup()
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/linux/Documentation/gpu/
H A Dbacklight.rst2 Backlight support
5 .. kernel-doc:: drivers/video/backlight/backlight.c
8 .. kernel-doc:: include/linux/backlight.h
11 .. kernel-doc:: drivers/video/backlight/backlight.c
/linux/arch/powerpc/platforms/powermac/
H A Dbacklight.c4 * Contains support for the backlight.
12 #include <linux/backlight.h>
18 #include <asm/backlight.h>
35 /* The via-pmu code allows the backlight to be grabbed, in which case the
46 /* Main backlight storage
48 * Backlight drivers in this variable are required to have the "ops"
51 * We can only store one backlight here, but since Apple laptops have only one
52 * internal display, it doesn't matter. Other backlight drivers can be used
60 struct device_node* bk_node = of_find_node_by_name(NULL, "backlight"); in pmac_has_backlight_type()
61 int i = of_property_match_string(bk_node, "backlight-control", type); in pmac_has_backlight_type()
/linux/Documentation/devicetree/bindings/leds/
H A Dleds-lm36274.txt1 * Texas Instruments LM36274 4-Channel LCD Backlight Driver w/Integrated Bias
4 The backlight boost provides the power to bias four parallel LED strings with
14 Required backlight properties:
16 "ti,lm36274-backlight"
24 Optional backlight properties:
70 backlight {
73 compatible = "ti,lm36274-backlight";
79 linux,default-trigger = "backlight";

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