| /linux-5.10/Documentation/devicetree/bindings/leds/backlight/ |
| D | pwm-backlight.yaml | 1 # SPDX-License-Identifier: GPL-2.0-only
3 ---
4 $id: http://devicetree.org/schemas/leds/backlight/pwm-backlight.yaml#
5 $schema: http://devicetree.org/meta-schemas/core.yaml#
7 title: pwm-backlight bindings
10 - Lee Jones <lee.jones@linaro.org>
11 - Daniel Thompson <daniel.thompson@linaro.org>
12 - Jingoo Han <jingoohan1@gmail.com>
16 const: pwm-backlight
21 pwm-names: true
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| D | led-backlight.yaml | 1 # SPDX-License-Identifier: GPL-2.0-only
3 ---
4 $id: http://devicetree.org/schemas/leds/backlight/led-backlight.yaml#
5 $schema: http://devicetree.org/meta-schemas/core.yaml#
7 title: led-backlight bindings
10 - Lee Jones <lee.jones@linaro.org>
11 - Daniel Thompson <daniel.thompson@linaro.org>
12 - Jingoo Han <jingoohan1@gmail.com>
21 const: led-backlight
25 $ref: /schemas/types.yaml#/definitions/phandle-array
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| D | lm3630a-backlight.yaml | 1 # SPDX-License-Identifier: (GPL-2.0 OR BSD-2-Clause)
3 ---
4 $id: http://devicetree.org/schemas/leds/backlight/lm3630a-backlight.yaml#
5 $schema: http://devicetree.org/meta-schemas/core.yaml#
7 title: TI LM3630A High-Efficiency Dual-String White LED
10 - Lee Jones <lee.jones@linaro.org>
11 - Daniel Thompson <daniel.thompson@linaro.org>
12 - Jingoo Han <jingoohan1@gmail.com>
15 The LM3630A is a current-mode boost converter which supplies the power and
26 '#address-cells':
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| D | tps65217-backlight.txt | 7 - compatible: "ti,tps65217"
8 - reg: I2C slave address
9 - backlight: node for specifying WLED1 and WLED2 lines in TPS65217
10 - isel: selection bit, valid values: 1 for ISEL1 (low-level) and 2 for ISEL2 (high-level)
11 - fdim: PWM dimming frequency, valid values: 100, 200, 500, 1000
12 - default-brightness: valid values: 0-100
22 isel = <1>; /* 1 - ISET1, 2 ISET2 */
24 default-brightness = <50>;
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| D | qcom-wled.yaml | 1 # SPDX-License-Identifier: (GPL-2.0 OR BSD-2-Clause)
3 ---
4 $id: http://devicetree.org/schemas/leds/backlight/qcom-wled.yaml#
5 $schema: http://devicetree.org/meta-schemas/core.yaml#
10 - Bjorn Andersson <bjorn.andersson@linaro.org>
11 - Kiran Gunda <kgunda@codeaurora.org>
21 - qcom,pm8941-wled
22 - qcom,pmi8998-wled
23 - qcom,pm660l-wled
24 - qcom,pm8150l-wled
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| D | kinetic,ktd253.yaml | 1 # SPDX-License-Identifier: (GPL-2.0 OR BSD-2-Clause)
3 ---
5 $schema: http://devicetree.org/meta-schemas/core.yaml#
7 title: Kinetic Technologies KTD253 one-wire backlight
10 - Linus Walleij <linus.walleij@linaro.org>
15 it goes to maximum backlight then you can set the level of backlight
20 - $ref: common.yaml#
26 enable-gpios:
30 default-brightness: true
31 max-brightness: true
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| /linux-5.10/drivers/video/backlight/ |
| D | led_bl.c | 1 // SPDX-License-Identifier: GPL-2.0
3 * Copyright (C) 2015-2019 Texas Instruments Incorporated - http://www.ti.com/
25 static void led_bl_set_brightness(struct led_bl_data *priv, int level) in led_bl_set_brightness() argument
30 if (priv->levels) in led_bl_set_brightness()
31 bkl_brightness = priv->levels[level]; in led_bl_set_brightness()
33 bkl_brightness = level; in led_bl_set_brightness()
35 for (i = 0; i < priv->nb_leds; i++) in led_bl_set_brightness()
36 led_set_brightness(priv->leds[i], bkl_brightness); in led_bl_set_brightness()
38 priv->enabled = true; in led_bl_set_brightness()
45 if (!priv->enabled) in led_bl_power_off()
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| D | tps65217_bl.c | 39 rc = tps65217_set_bits(tps65217_bl->tps, TPS65217_REG_WLEDCTRL1, in tps65217_bl_enable()
43 dev_err(tps65217_bl->dev, in tps65217_bl_enable()
48 tps65217_bl->is_enabled = true; in tps65217_bl_enable()
50 dev_dbg(tps65217_bl->dev, "backlight enabled\n"); in tps65217_bl_enable()
59 rc = tps65217_clear_bits(tps65217_bl->tps, in tps65217_bl_disable()
64 dev_err(tps65217_bl->dev, in tps65217_bl_disable()
69 tps65217_bl->is_enabled = false; in tps65217_bl_disable()
71 dev_dbg(tps65217_bl->dev, "backlight disabled\n"); in tps65217_bl_disable()
80 int brightness = backlight_get_brightness(bl); in tps65217_bl_update_status() local
82 if (brightness > 0) { in tps65217_bl_update_status()
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| D | ktd253-backlight.c | 1 // SPDX-License-Identifier: GPL-2.0-only
4 * Based on code and know-how from the Samsung GT-S7710
40 int brightness = backlight_get_brightness(bl); in ktd253_backlight_update_status() local
42 u16 current_ratio = ktd253->ratio; in ktd253_backlight_update_status()
45 dev_dbg(ktd253->dev, "new brightness/ratio: %d/32\n", brightness); in ktd253_backlight_update_status()
47 target_ratio = brightness; in ktd253_backlight_update_status()
54 gpiod_set_value_cansleep(ktd253->gpiod, 0); in ktd253_backlight_update_status()
60 ktd253->ratio = 0; in ktd253_backlight_update_status()
65 gpiod_set_value_cansleep(ktd253->gpiod, 1); in ktd253_backlight_update_status()
73 * The loop to set the correct current level is performed in ktd253_backlight_update_status()
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| D | pwm_bl.c | 1 // SPDX-License-Identifier: GPL-2.0-only
35 int brightness);
37 int brightness);
47 pwm_get_state(pb->pwm, &state); in pwm_backlight_power_on()
48 if (pb->enabled) in pwm_backlight_power_on()
51 err = regulator_enable(pb->power_supply); in pwm_backlight_power_on()
53 dev_err(pb->dev, "failed to enable power supply\n"); in pwm_backlight_power_on()
56 pwm_apply_state(pb->pwm, &state); in pwm_backlight_power_on()
58 if (pb->post_pwm_on_delay) in pwm_backlight_power_on()
59 msleep(pb->post_pwm_on_delay); in pwm_backlight_power_on()
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| D | backlight.c | 1 // SPDX-License-Identifier: GPL-2.0-only
5 * Copyright (C) 2003,2004 Hewlett-Packard Company
33 * When the core detect changes in for example brightness or power state
39 * - brightness R/W, set the requested brightness level
40 * - actual_brightness RO, the brightness level used by the HW
41 * - max_brightness RO, the maximum brightness level supported
43 * See Documentation/ABI/stable/sysfs-class-backlight for the full list.
47 * a hot-key or some other platform or firmware specific way.
51 * brightness, thus providing user-space access to the actual level
54 * When the backlight changes this is reported to user-space using
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| /linux-5.10/Documentation/ABI/testing/ |
| D | sysfs-class-led | 1 What: /sys/class/leds/<led>/brightness
6 Set the brightness of the LED.
8 Most LEDs don't have hardware brightness support, so will
9 just be turned on for non-zero brightness settings.
20 led_brightness = brightness * multi_intensity/max_brightness
23 Documentation/leds/leds-class-multicolor.rst.
30 Writing non-zero to this file while trigger is active changes the
31 top brightness trigger is going to use.
40 Maximum brightness level for this LED, default is 255 (LED_FULL).
42 If the LED does not support different brightness levels, this
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| D | sysfs-class-backlight-adp5520 | 2 ---------------------------------------------------------------
4 The backlight brightness control operates at three different levels for the
5 adp5520 and adp5501 devices: daylight (level 1), office (level 2) and dark
6 (level 3). By default the brightness operates at the daylight brightness level.
15 (RW) Maximum current setting for the backlight when brightness
18 value between 0 mA and 30 mA using linear or non-linear
28 (RW) Dim current setting for the backlight when brightness is at
31 between 0 mA and 30 mA using linear or non-linear algorithms.
|
| D | sysfs-class-backlight-adp8860 | 2 -----------------------------------------------------------
4 The backlight brightness control operates at three different levels for the
5 adp8860, adp8861 and adp8863 devices: daylight (level 1), office (level 2) and
6 dark (level 3). By default the brightness operates at the daylight brightness
7 level.
20 (RW) Maximum current setting for the backlight when brightness
23 value between 0 mA and 30 mA using linear or non-linear
34 (RW) Dim current setting for the backlight when brightness is at
37 between 0 mA and 30 mA using linear or non-linear algorithms.
|
| /linux-5.10/drivers/acpi/ |
| D | acpi_video.c | 1 // SPDX-License-Identifier: GPL-2.0-or-later
3 * video.c - ACPI Video Driver
7 * Copyright (C) 2006 Thomas Tuttle <linux-kernel@ttuttle.net>
47 * By default, we don't allow duplicate ACPI video bus devices
53 static int disable_backlight_sysfs_if = -1;
58 static int report_key_events = -1;
61 "0: none, 1: output changes, 2: brightness changes, 3: all");
63 static int hw_changes_brightness = -1;
66 "Set this to 1 on buggy hw which changes the brightness itself when "
67 "a hotkey is pressed: -1: auto, 0: normal 1: hw-changes-brightness");
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| /linux-5.10/arch/arm64/boot/dts/allwinner/ |
| D | sun50i-a64-pinephone-1.1.dts | 1 // SPDX-License-Identifier: (GPL-2.0+ OR MIT)
4 /dts-v1/;
6 #include "sun50i-a64-pinephone.dtsi"
10 compatible = "pine64,pinephone-1.1", "allwinner,sun50i-a64";
14 power-supply = <®_ldo_io0>;
18 * being off is around 20%. Duty cycle for the lowest brightness level
20 * value here was chosen as a safe default.
22 brightness-levels = <
28 num-interpolated-steps = <50>;
29 default-brightness-level = <400>;
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| D | sun50i-a64-pinephone-1.2.dts | 1 // SPDX-License-Identifier: (GPL-2.0+ OR MIT)
4 /dts-v1/;
6 #include "sun50i-a64-pinephone.dtsi"
10 compatible = "pine64,pinephone-1.2", "allwinner,sun50i-a64";
14 power-supply = <®_ldo_io0>;
18 * is around 10%. Duty cycle for the lowest brightness level also varries
20 * chosen as a safe default.
22 brightness-levels = <
29 num-interpolated-steps = <50>;
30 default-brightness-level = <500>;
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| /linux-5.10/Documentation/admin-guide/laptops/ |
| D | thinkpad-acpi.rst | 9 - Borislav Deianov <borislav@users.sf.net>
10 - Henrique de Moraes Holschuh <hmh@hmh.eng.br>
12 http://ibm-acpi.sf.net/
19 This driver used to be named ibm-acpi until kernel 2.6.21 and release
20 0.13-20070314. It used to be in the drivers/acpi tree, but it was
21 moved to the drivers/misc tree and renamed to thinkpad-acpi for kernel
25 The driver is named "thinkpad-acpi". In some places, like module
29 "tpacpi" is used as a shorthand where "thinkpad-acpi" would be too
33 ------
38 - Fn key combinations
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| /linux-5.10/drivers/leds/ |
| D | leds-tca6507.c | 1 // SPDX-License-Identifier: GPL-2.0-only
3 * leds-tca6507
9 * blink or double-blink.
12 * out-only (pull-up resistor required) or as an LED with variable
13 * brightness and hardware-assisted blinking.
15 * Apart from OFF and ON there are three programmable brightness
21 * with separate time for rise, on, fall, off and second-off. Thus if
22 * 3 or more different non-trivial rates are required, software must
25 * support double-blink so 'second-off' always matches 'off'.
42 * delays in the ranges: 56-72, 112-144, 168-216, 224-27504,
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| /linux-5.10/include/linux/ |
| D | leds.h | 1 /* SPDX-License-Identifier: GPL-2.0-only */
11 #include <dt-bindings/leds/common.h>
28 /* This is obsolete/useless. We now support variable maximum brightness. */
40 * default <color:function> tuple, for backward compatibility
41 * with in-driver hard-coded LED names used as a fallback when
54 * only LEDs exposed by drivers of hot-pluggable devices should
66 enum led_brightness brightness; member
93 /* Set LED brightness level
95 * that can sleep while setting brightness.
98 enum led_brightness brightness);
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| /linux-5.10/Documentation/devicetree/bindings/mfd/ |
| D | ti-lmu.txt | 6 ------ ---------------------------------
14 - compatible: Should be one of:
20 - reg: I2C slave address.
28 - enable-gpios: A GPIO specifier for hardware enable pin.
29 - ramp-up-us: Current ramping from one brightness level to
30 the a higher brightness level.
31 Range from 2048 us - 117.44 s
32 - ramp-down-us: Current ramping from one brightness level to
33 the a lower brightness level.
34 Range from 2048 us - 117.44 s
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| /linux-5.10/Documentation/devicetree/bindings/display/ |
| D | ht16k33.txt | 2 -------------------------------------------------------------------------------
5 - compatible: "holtek,ht16k33"
6 - reg: I2C slave address of the chip.
7 - interrupts: Interrupt specification for the key pressed interrupt.
8 - refresh-rate-hz: Display update interval in HZ.
9 - debounce-delay-ms: Debouncing interval time in milliseconds.
10 - linux,keymap: The keymap for keys as described in the binding
11 document (devicetree/bindings/input/matrix-keymap.txt).
14 - linux,no-autorepeat: Disable keyrepeat.
15 - default-brightness-level: Initial brightness level [0-15] (default: 15).
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| /linux-5.10/arch/arm/boot/dts/ |
| D | imx6q-logicpd.dts | 1 // SPDX-License-Identifier: GPL-2.0
5 /dts-v1/;
7 #include "imx6-logicpd-som.dtsi"
8 #include "imx6-logicpd-baseboard.dtsi"
11 model = "Logic PD i.MX6QD SOM-M3";
12 compatible = "logicpd,imx6q-logicpd", "fsl,imx6q";
14 backlight: backlight-lvds {
15 compatible = "pwm-backlight";
17 brightness-levels = <0 4 8 16 32 64 128 255>;
18 default-brightness-level = <6>;
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| D | imx6dl-aristainetos_7.dts | 1 // SPDX-License-Identifier: GPL-2.0-only
7 /dts-v1/;
9 #include "imx6qdl-aristainetos.dtsi"
21 compatible = "fsl,imx-parallel-display";
22 interface-pix-fmt = "rgb24";
23 pinctrl-names = "default";
24 pinctrl-0 = <&pinctrl_ipu_disp>;
27 display-timings {
29 native-mode;
30 clock-frequency = <33246000>;
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| /linux-5.10/arch/arm64/boot/dts/renesas/ |
| D | hihope-rzg2-ex-lvds.dtsi | 1 // SPDX-License-Identifier: GPL-2.0
10 compatible = "pwm-backlight";
13 brightness-levels = <0 2 8 16 32 64 128 255>;
14 default-brightness-level = <6>;
23 lvds-connector-en-gpio {
24 gpio-hog;
26 output-low;
27 line-name = "lvds-connector-en-gpio";
48 pinctrl-0 = <&pwm0_pins>;
49 pinctrl-names = "default";
|