| /Linux-v6.1/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@kernel.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@kernel.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 | mediatek,mt6370-backlight.yaml | 1 # SPDX-License-Identifier: (GPL-2.0-only OR BSD-2-Clause)
3 ---
4 $id: http://devicetree.org/schemas/leds/backlight/mediatek,mt6370-backlight.yaml#
5 $schema: http://devicetree.org/meta-schemas/core.yaml#
10 - ChiaEn Wu <chiaen_wu@richtek.com>
21 - $ref: common.yaml#
26 - mediatek,mt6370-backlight
27 - mediatek,mt6372-backlight
29 default-brightness:
32 max-brightness:
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| /Linux-v6.1/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>
52 static int report_key_events = -1;
55 "0: none, 1: output changes, 2: brightness changes, 3: all");
57 static int hw_changes_brightness = -1;
60 "Set this to 1 on buggy hw which changes the brightness itself when "
61 "a hotkey is pressed: -1: auto, 0: normal 1: hw-changes-brightness");
70 static int only_lcd = -1;
102 ACPI_VIDEO_AC_LEVEL, /* level when machine has full power */
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| /Linux-v6.1/Documentation/ABI/testing/ |
| D | sysfs-class-backlight | 6 Description of the scale of the brightness curve.
8 The human eye senses brightness approximately logarithmically,
9 hence linear changes in brightness are perceived as being
10 non-linear. To achieve a linear perception of brightness changes
12 backlights with a linear brightness curve.
17 The scale of the brightness curve is unknown.
20 The brightness changes linearly with each step. Brightness
24 non-linear
25 The brightness changes non-linearly with each step. Brightness
38 The value range is device-driver specific:
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| 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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| /Linux-v6.1/include/linux/platform_data/x86/ |
| D | nvidia-wmi-ec-backlight.h | 1 /* SPDX-License-Identifier: GPL-2.0-only */
9 #define WMI_BRIGHTNESS_GUID "603E9613-EF25-4338-A3D0-C46177516DB7"
12 * enum wmi_brightness_method - WMI method IDs
13 * @WMI_BRIGHTNESS_METHOD_LEVEL: Get/Set EC brightness level status
14 * @WMI_BRIGHTNESS_METHOD_SOURCE: Get/Set EC Brightness Source
23 * enum wmi_brightness_mode - Operation mode for WMI-wrapped method
24 * @WMI_BRIGHTNESS_MODE_GET: Get the current brightness level/source.
25 * @WMI_BRIGHTNESS_MODE_SET: Set the brightness level.
26 * @WMI_BRIGHTNESS_MODE_GET_MAX_LEVEL: Get the maximum brightness level. This
38 * enum wmi_brightness_source - Backlight brightness control source selection
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| /Linux-v6.1/Documentation/firmware-guide/acpi/ |
| D | video_extension.rst | 1 .. SPDX-License-Identifier: GPL-2.0
16 Export a sysfs interface for user space to control backlight level
26 Documentation/ABI/stable/sysfs-class-backlight.
32 get the brightness level the firmware thinks it is at;
34 not implemented, will set the current brightness instead;
35 brightness:
36 on write, control method _BCM will run to set the requested brightness level;
43 brightness, actual_brightness and max_brightness. So if we have
68 corresponds to the 0x0A brightness value) to 9 (that corresponds to the
69 0x64 brightness value) inclusive. Each of those index values is regarded
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| /Linux-v6.1/drivers/video/backlight/ |
| D | rt4831-backlight.c | 1 // SPDX-License-Identifier: GPL-2.0-only
3 #include <dt-bindings/leds/rt4831-backlight.h>
42 int brightness = backlight_get_brightness(bl_dev); in rt4831_bl_update_status() local
43 unsigned int enable = brightness ? RT4831_BLEN_MASK : 0; in rt4831_bl_update_status()
47 if (brightness) { in rt4831_bl_update_status()
48 v[0] = (brightness - 1) & RT4831_BLDIML_MASK; in rt4831_bl_update_status()
49 v[1] = ((brightness - 1) & RT4831_BLDIMH_MASK) >> RT4831_BLDIMH_SHIFT; in rt4831_bl_update_status()
51 ret = regmap_raw_write(priv->regmap, RT4831_REG_BLDIML, v, sizeof(v)); in rt4831_bl_update_status()
56 return regmap_update_bits(priv->regmap, RT4831_REG_ENABLE, RT4831_BLEN_MASK, enable); in rt4831_bl_update_status()
67 ret = regmap_read(priv->regmap, RT4831_REG_ENABLE, &val); in rt4831_bl_get_brightness()
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| 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 | adp8870_bl.c | 1 // SPDX-License-Identifier: GPL-2.0-or-later
5 * Copyright 2009-2011 Analog Devices Inc.
35 #define ADP8870_BLMX1 0x0A /* Backlight (Brightness Level 1-daylight) maximum current */
36 #define ADP8870_BLDM1 0x0B /* Backlight (Brightness Level 1-daylight) dim current */
37 #define ADP8870_BLMX2 0x0C /* Backlight (Brightness Level 2-bright) maximum current */
38 #define ADP8870_BLDM2 0x0D /* Backlight (Brightness Level 2-bright) dim current */
39 #define ADP8870_BLMX3 0x0E /* Backlight (Brightness Level 3-office) maximum current */
40 #define ADP8870_BLDM3 0x0F /* Backlight (Brightness Level 3-office) dim current */
41 #define ADP8870_BLMX4 0x10 /* Backlight (Brightness Level 4-indoor) maximum current */
42 #define ADP8870_BLDM4 0x11 /* Backlight (Brightness Level 4-indoor) dim current */
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| D | tps65217_bl.c | 1 // SPDX-License-Identifier: GPL-2.0-only
31 rc = tps65217_set_bits(tps65217_bl->tps, TPS65217_REG_WLEDCTRL1, in tps65217_bl_enable()
35 dev_err(tps65217_bl->dev, in tps65217_bl_enable()
40 tps65217_bl->is_enabled = true; in tps65217_bl_enable()
42 dev_dbg(tps65217_bl->dev, "backlight enabled\n"); in tps65217_bl_enable()
51 rc = tps65217_clear_bits(tps65217_bl->tps, in tps65217_bl_disable()
56 dev_err(tps65217_bl->dev, in tps65217_bl_disable()
61 tps65217_bl->is_enabled = false; in tps65217_bl_disable()
63 dev_dbg(tps65217_bl->dev, "backlight disabled\n"); in tps65217_bl_disable()
72 int brightness = backlight_get_brightness(bl); in tps65217_bl_update_status() local
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| D | adp8860_bl.c | 1 // SPDX-License-Identifier: GPL-2.0-or-later
5 * Copyright 2009-2010 Analog Devices Inc.
33 #define ADP8860_BLMX1 0x09 /* Backlight (Brightness Level 1-daylight) maximum current */
34 #define ADP8860_BLDM1 0x0A /* Backlight (Brightness Level 1-daylight) dim current */
35 #define ADP8860_BLMX2 0x0B /* Backlight (Brightness Level 2-office) maximum current */
36 #define ADP8860_BLDM2 0x0C /* Backlight (Brightness Level 2-office) dim current */
37 #define ADP8860_BLMX3 0x0D /* Backlight (Brightness Level 3-dark) maximum current */
38 #define ADP8860_BLDM3 0x0E /* Backlight (Brightness Level 3-dark) dim current */
57 #define ADP8860_PH1LEVL 0x21 /* First phototransistor ambient light level-low byte register */
58 #define ADP8860_PH1LEVH 0x22 /* First phototransistor ambient light level-high byte register */
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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-v6.1/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-v6.1/arch/powerpc/platforms/powermac/ |
| D | backlight.c | 1 // SPDX-License-Identifier: GPL-2.0-only
7 * Copyright (C) 2006 Michael Hanselmann <linux-kernel@hansmi.ch>
35 /* The via-pmu code allows the backlight to be grabbed, in which case the
36 * in-kernel control of the brightness needs to be disabled. This should
64 "backlight-control", NULL); in pmac_has_backlight_type()
77 int level = (FB_BACKLIGHT_LEVELS - 1); in pmac_backlight_curve_lookup() local
79 if (info && info->bl_dev) { in pmac_backlight_curve_lookup()
84 max = max((int)info->bl_curve[i], max); in pmac_backlight_curve_lookup()
88 int diff = abs(info->bl_curve[i] - value); in pmac_backlight_curve_lookup()
91 level = i; in pmac_backlight_curve_lookup()
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| /Linux-v6.1/drivers/leds/flash/ |
| D | leds-mt6360.c | 1 // SPDX-License-Identifier: GPL-2.0-only
8 #include <linux/led-class-flash.h>
9 #include <linux/led-class-multicolor.h>
15 #include <media/v4l2-flash-led-class.h>
29 #define MT6360_ISNK_ENMASK(_led_no) BIT(7 - (_led_no))
39 #define MT6360_REG_FLEDBASE(_id) (0x372 + 4 * (_id - MT6360_LED_FLASH1))
49 #define MT6360_FLCSEN_MASK(_id) BIT(MT6360_LED_FLASH2 - _id)
102 enum led_brightness level) in mt6360_mc_brightness_set() argument
106 struct mt6360_priv *priv = led->priv; in mt6360_mc_brightness_set()
110 mutex_lock(&priv->lock); in mt6360_mc_brightness_set()
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| /Linux-v6.1/drivers/platform/chrome/ |
| D | cros_kbd_led_backlight.c | 1 // SPDX-License-Identifier: GPL-2.0+
26 * struct keyboard_led_drvdata - keyboard LED driver data.
28 * @brightness_get: Get LED brightness level.
29 * @brightness_set: Set LED brightness level. Must not sleep.
30 * @brightness_set_blocking: Set LED brightness level. It can block the
33 * @max_brightness: Maximum brightness.
43 enum led_brightness brightness);
45 enum led_brightness brightness);
60 enum led_brightness brightness) in keyboard_led_set_brightness_acpi() argument
67 param.integer.value = brightness; in keyboard_led_set_brightness_acpi()
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| /Linux-v6.1/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-v6.1/drivers/platform/x86/ |
| D | fujitsu-laptop.c | 1 // SPDX-License-Identifier: GPL-2.0-or-later
2 /*-*-linux-c-*-*/
10 Adrian Yee <brewt-fujitsu@brewt.org>
12 Templated from msi-laptop.c and thinkpad_acpi.c which is copyright
18 * fujitsu-laptop.c - Fujitsu laptop support, providing access to additional
22 * This driver implements a vendor-specific backlight control interface for
27 * P8010. It should work on most P-series and S-series Lifebooks, but
31 * brightness controls which are used by different Fujitsu laptops. In most
48 #include <linux/input/sparse-keymap.h>
60 #define ACPI_FUJITSU_BL_DRIVER_NAME "Fujitsu laptop FUJ02B1 ACPI brightness driver"
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| /Linux-v6.1/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-v6.1/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", "pine64,pinephone", "allwinner,sun50i-a64";
14 power-supply = <®_ldo_io0>;
18 * being off is around 20%. Duty cycle for the lowest brightness level
22 brightness-levels = <
28 num-interpolated-steps = <50>;
29 default-brightness-level = <400>;
33 allwinner,internal-bias-resistor;
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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", "pine64,pinephone", "allwinner,sun50i-a64";
12 wifi_pwrseq: wifi-pwrseq {
13 compatible = "mmc-pwrseq-simple";
14 reset-gpios = <&r_pio 0 2 GPIO_ACTIVE_LOW>; /* PL2 */
19 power-supply = <®_ldo_io0>;
23 * is around 10%. Duty cycle for the lowest brightness level also varries
27 brightness-levels = <
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| /Linux-v6.1/drivers/macintosh/ |
| D | via-pmu-backlight.c | 1 // SPDX-License-Identifier: GPL-2.0
3 * Backlight code for via-pmu
6 * Copyright (C) 2001-2002 Benjamin Herrenschmidt
7 * Copyright (C) 2006 Michael Hanselmann <linux-kernel@hansmi.ch>
25 int i, flat, count, range = (max - min); in pmu_backlight_init_curve()
39 int level = (FB_BACKLIGHT_LEVELS - 1); in pmu_backlight_curve_lookup() local
48 int diff = abs(bl_curve[i] - value); in pmu_backlight_curve_lookup()
51 level = i; in pmu_backlight_curve_lookup()
54 return level; in pmu_backlight_curve_lookup()
57 static int pmu_backlight_get_level_brightness(int level) in pmu_backlight_get_level_brightness() argument
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| /Linux-v6.1/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. */
47 * with in-driver hard-coded LED names used as a fallback when
60 * only LEDs exposed by drivers of hot-pluggable devices should
72 unsigned int brightness; member
99 /* Set LED brightness level
101 * that can sleep while setting brightness.
104 enum led_brightness brightness);
106 * Set LED brightness level immediately - it can block the caller for
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