| /Linux-v5.15/drivers/leds/ |
| D | leds-pwm.c | 1 // SPDX-License-Identifier: GPL-2.0-only
3 * linux/drivers/leds-pwm.c
5 * simple PWM based LED control
9 * based on leds-gpio.c by Raphael Assenat <raph@8d.com>
16 #include <linux/leds.h>
18 #include <linux/pwm.h>
20 #include "leds.h"
31 struct pwm_device *pwm; member
38 struct led_pwm_data leds[]; member
46 unsigned int max = led_dat->cdev.max_brightness; in led_pwm_set()
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| D | leds-pca9532.c | 1 // SPDX-License-Identifier: GPL-2.0-only
3 * pca9532.c - 16-bit Led dimmer
14 #include <linux/leds.h>
18 #include <linux/leds-pca9532.h>
41 struct pca9532_led leds[16]; member
49 u8 pwm[2]; member
103 .name = "leds-pca953x",
111 /* We have two pwm/blinkers, but 16 possible leds to drive. Additionally,
112 * the clever Thecus people are using one pwm to drive the beeper. So,
113 * as a compromise we average one pwm to the values requested by all
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| D | Kconfig | 1 # SPDX-License-Identifier: GPL-2.0-only
13 LEDs from both userspace and optionally, by kernel events (triggers).
20 This option enables the LED sysfs class in /sys/class/leds. You'll
21 need this to do anything useful with LEDs. If unsure, say Y.
27 This option enables the flash LED sysfs class in /sys/class/leds.
28 It wraps LED Class and adds flash LEDs specific sysfs attributes
37 This option enables the multicolor LED sysfs class in /sys/class/leds.
40 for multicolor LEDs that are grouped together. This class is not
41 intended for single color LEDs. It can be built as a module.
48 for LED sysfs class devices under /sys/class/leds.
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| D | leds-pca955x.c | 1 // SPDX-License-Identifier: GPL-2.0-only
3 * Copyright 2007-2008 Extreme Engineering Solutions, Inc.
5 * Author: Nate Case <ncase@xes-inc.com>
11 * Device Description 7-bit slave address
12 * ------ ----------- -------------------
13 * PCA9550 2-bit driver 0x60 .. 0x61
14 * PCA9551 8-bit driver 0x60 .. 0x67
15 * PCA9552 16-bit driver 0x60 .. 0x67
16 * PCA9553/01 4-bit driver 0x62
17 * PCA9553/02 4-bit driver 0x63
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| D | leds-is31fl32xx.c | 1 // SPDX-License-Identifier: GPL-2.0-only
8 * http://www.issi.com/US/product-analog-fxled-driver.shtml
9 * http://www.si-en.com/product.asp?parentid=890
15 #include <linux/leds.h>
39 u8 channel; /* 1-based, max priv->cdef->channels */
47 struct is31fl32xx_led_data leds[]; member
51 * struct is31fl32xx_chipdef - chip-specific attributes
54 * @pwm_update_reg : address of PWM Update register
57 * @pwm_register_base : address of first PWM register
58 * @pwm_registers_reversed: : true if PWM registers count down instead of up
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| D | leds-lp3944.c | 1 // SPDX-License-Identifier: GPL-2.0-only
3 * leds-lp3944.c - driver for National Semiconductor LP3944 Funlight Chip
12 * This helper chip can drive up to 8 leds, with two programmable DIM modes;
16 * The DIM modes are used to set _blink_ patterns for leds, the pattern is
18 * - period: from 0s to 1.6s
19 * - duty cycle: percentage of the period the led is on, from 0 to 100
22 * leds, the camera flash light and the displays backlights.
28 #include <linux/leds.h>
30 #include <linux/leds-lp3944.h>
33 #define LP3944_REG_INPUT1 0x00 /* LEDs 0-7 InputRegister (Read Only) */
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| /Linux-v5.15/Documentation/devicetree/bindings/leds/ |
| D | leds-pwm.yaml | 1 # SPDX-License-Identifier: (GPL-2.0-only OR BSD-2-Clause)
3 ---
4 $id: http://devicetree.org/schemas/leds/leds-pwm.yaml#
5 $schema: http://devicetree.org/meta-schemas/core.yaml#
7 title: LEDs connected to PWM
10 - Pavel Machek <pavel@ucw.cz>
13 Each LED is represented as a sub-node of the pwm-leds device. Each
18 const: pwm-leds
21 "^led(-[0-9a-f]+)?$":
30 pwm-names: true
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| D | leds-pca9532.txt | 1 *NXP - pca9532 PWM LED Driver
3 The PCA9532 family is SMBus I/O expander optimized for dimming LEDs.
4 The PWM support 256 steps.
7 - compatible:
12 - reg - I2C slave address
14 Each led is represented as a sub-node of the nxp,pca9530.
16 Optional sub-node properties:
17 - label: see Documentation/devicetree/bindings/leds/common.txt
18 - type: Output configuration, see dt-bindings/leds/leds-pca9532.h (default NONE)
19 - linux,default-trigger: see Documentation/devicetree/bindings/leds/common.txt
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| /Linux-v5.15/Documentation/ABI/testing/ |
| D | sysfs-class-led-driver-lm3533 | 1 What: /sys/class/leds/<led>/als_channel
7 ALS-current-control mode (1, 2), where:
14 What: /sys/class/leds/<led>/als_en
19 Enable ALS-current-control mode (0, 1).
21 What: /sys/class/leds/<led>/falltime
22 What: /sys/class/leds/<led>/risetime
40 What: /sys/class/leds/<led>/id
47 What: /sys/class/leds/<led>/linear
52 Set the brightness-mapping mode (0, 1), where:
59 What: /sys/class/leds/<led>/pwm
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| /Linux-v5.15/drivers/mfd/ |
| D | lp3943.c | 1 // SPDX-License-Identifier: GPL-2.0-only
11 * It can be used for a GPIO expander and PWM generators.
16 * LP3943 MFD ---- GPIO expander leds-gpio eg) HW enable pin
18 * --- PWM generator leds-pwm eg) PWM input
20 * Internal two PWM channels are used for LED dimming effect.
23 * LEDs can be controlled with legacy leds-gpio(static brightness) or
24 * leds-pwm drivers(dynamic brightness control).
25 * Alternatively, it can be used for generic GPIO and PWM controller.
27 * A PWM is input pin of a backlight device.
64 .name = "lp3943-pwm",
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| /Linux-v5.15/Documentation/devicetree/bindings/mfd/ |
| D | max77693.txt | 1 Maxim MAX77693 multi-function device
4 - PMIC,
5 - CHARGER,
6 - LED,
7 - MUIC,
8 - HAPTIC
14 - compatible : Must be "maxim,max77693".
15 - reg : Specifies the i2c slave address of PMIC block.
16 - interrupts : This i2c device has an IRQ line connected to the main SoC.
19 - regulators : The regulators of max77693 have to be instantiated under subnode
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| 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
31 Range from 2048 us - 117.44 s
32 - ramp-down-us: Current ramping from one brightness level to
34 Range from 2048 us - 117.44 s
35 - ti,brightness-resolution - This determines whether to use 8 bit brightness
47 - backlight: All LMU devices have backlight child nodes.
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| /Linux-v5.15/Documentation/devicetree/bindings/pwm/ |
| D | pwm-lp3943.txt | 1 TI/National Semiconductor LP3943 PWM controller
4 - compatible: "ti,lp3943-pwm"
5 - #pwm-cells: Should be 2. See pwm.yaml in this directory for a
9 - ti,pwm0 or ti,pwm1: Output pin number(s) for PWM channel 0 or 1.
17 PWM 0 is for RGB LED brightness control
18 PWM 1 is for brightness control of LP8557 backlight device
26 * PWM 0 : output 8, 9 and 10
27 * PWM 1 : output 15
29 pwm3943: pwm {
30 compatible = "ti,lp3943-pwm";
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| D | atmel-pwm.txt | 1 Atmel PWM controller
4 - compatible: should be one of:
5 - "atmel,at91sam9rl-pwm"
6 - "atmel,sama5d3-pwm"
7 - "atmel,sama5d2-pwm"
8 - "microchip,sam9x60-pwm"
9 - reg: physical base address and length of the controller's registers
10 - #pwm-cells: Should be 3. See pwm.yaml in this directory for a
15 pwm0: pwm@f8034000 {
16 compatible = "atmel,at91sam9rl-pwm";
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| D | nxp,pca9685-pwm.txt | 1 NXP PCA9685 16-channel 12-bit PWM LED controller
5 - compatible: "nxp,pca9685-pwm"
6 - #pwm-cells: Should be 2. See pwm.yaml in this directory for a description of
8 The index 16 is the ALLCALL channel, that sets all PWM channels at the same
12 - invert (bool): boolean to enable inverted logic
13 - open-drain (bool): boolean to configure outputs with open-drain structure;
14 if omitted use totem-pole structure
18 For LEDs that are directly connected to the PCA, the following setting is
22 compatible = "nxp,pca9685-pwm";
23 #pwm-cells = <2>;
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| /Linux-v5.15/arch/arm/boot/dts/ |
| D | bcm53016-meraki-mr32.dts | 1 // SPDX-License-Identifier: GPL-2.0-or-later OR MIT
6 * Copyright (C) 2018-2020 Christian Lamparter <chunkeey@gmail.com>
9 /dts-v1/;
12 #include "bcm5301x-nand-cs0-bch8.dtsi"
13 #include <dt-bindings/leds/common.h>
32 leds {
33 compatible = "gpio-leds";
39 panic-indicator;
49 compatible = "gpio-keys";
50 #address-cells = <1>;
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| D | exynos54xx-odroidxu-leds.dtsi | 1 // SPDX-License-Identifier: GPL-2.0
11 #include <dt-bindings/gpio/gpio.h>
14 led-controller-1 {
15 compatible = "pwm-leds";
17 led-1 {
19 pwms = <&pwm 1 2000000 0>;
20 pwm-names = "pwm1";
25 max-brightness = <127>;
26 linux,default-trigger = "mmc0";
29 led-2 {
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| D | exynos4412-odroidu3.dts | 1 // SPDX-License-Identifier: GPL-2.0
3 * Hardkernel's Exynos4412 based ODROID-U3 board device tree source
7 * Device tree source file for Hardkernel's ODROID-U3 board which is based
11 /dts-v1/;
12 #include "exynos4412-odroid-common.dtsi"
13 #include "exynos4412-prime.dtsi"
16 model = "Hardkernel ODROID-U3 board based on Exynos4412";
17 compatible = "hardkernel,odroid-u3", "samsung,exynos4412", "samsung,exynos4";
28 vbus_otg_reg: regulator-1 {
29 compatible = "regulator-fixed";
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| D | at91-kizboxmini-common.dtsi | 1 // SPDX-License-Identifier: GPL-2.0
3 * at91-kizboxmini.dts - Device Tree file for Overkiz Kizbox mini board
5 * Copyright (C) 2014-2018 Overkiz SAS
16 stdout-path = &dbgu;
25 clock-frequency = <12000000>;
29 clock-frequency = <32768>;
38 compatible = "gpio-keys";
39 #address-cells = <1>;
40 #size-cells = <0>;
46 wakeup-source;
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| D | imx28-m28cu3.dts | 1 // SPDX-License-Identifier: GPL-2.0-or-later
6 /dts-v1/;
20 nand-controller@8000c000 {
21 #address-cells = <1>;
22 #size-cells = <1>;
23 pinctrl-names = "default";
24 pinctrl-0 = <&gpmi_pins_a &gpmi_status_cfg>;
28 label = "gpmi-nfc-0-boot";
30 read-only;
34 label = "gpmi-nfc-general-use";
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| D | armada-388-helios4.dts | 1 // SPDX-License-Identifier: (GPL-2.0 OR MIT)
10 /dts-v1/;
11 #include "armada-388.dtsi"
12 #include "armada-38x-solidrun-microsom.dtsi"
25 /* So that mvebu u-boot can update the MAC addresses */
30 stdout-path = "serial0:115200n8";
33 reg_12v: regulator-12v {
34 compatible = "regulator-fixed";
35 regulator-name = "power_brick_12V";
36 regulator-min-microvolt = <12000000>;
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| /Linux-v5.15/drivers/pwm/ |
| D | pwm-pca9685.c | 1 // SPDX-License-Identifier: GPL-2.0-only
3 * Driver for PCA9685 16-channel 12-bit PWM LED controller
8 * based on the pwm-twl-led.c driver
18 #include <linux/pwm.h>
28 * PWM channels requested afterwards must use a period that results in the same
97 /* No PWM enabled: Change allowed */ in pca9685_prescaler_can_change()
98 if (bitmap_empty(pca->pwms_enabled, PCA9685_MAXCHAN + 1)) in pca9685_prescaler_can_change()
100 /* More than one PWM enabled: Change not allowed */ in pca9685_prescaler_can_change()
101 if (bitmap_weight(pca->pwms_enabled, PCA9685_MAXCHAN + 1) > 1) in pca9685_prescaler_can_change()
104 * Only one PWM enabled: Change allowed if the PWM about to in pca9685_prescaler_can_change()
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| /Linux-v5.15/drivers/platform/chrome/wilco_ec/ |
| D | keyboard_leds.c | 1 // SPDX-License-Identifier: GPL-2.0
13 #include <linux/leds.h>
14 #include <linux/platform_data/wilco-ec.h>
33 * struct wilco_keyboard_leds_msg - Message to/from EC for keyboard LED control.
40 * @percent: Brightness in 0-100. Only meaningful in PWM mode.
71 dev_err(ec->dev, in send_kbbl_msg()
72 "Failed sending keyboard LEDs command: %d\n", ret); in send_kbbl_msg()
96 dev_err(ec->dev, in set_kbbl()
97 "EC reported failure sending keyboard LEDs command: %d\n", in set_kbbl()
99 return -EIO; in set_kbbl()
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| /Linux-v5.15/Documentation/driver-api/ |
| D | pwm.rst | 2 Pulse Width Modulation (PWM) interface
5 This provides an overview about the Linux PWM interface
7 PWMs are commonly used for controlling LEDs, fans or vibrators in
9 the Linux PWM API (although they could). However, PWMs are often
11 up to the board designer to connect them to LEDs or fans. To provide
12 this kind of flexibility the generic PWM API exists.
15 ----------------
17 Users of the legacy PWM API use unique IDs to refer to PWM devices.
19 Instead of referring to a PWM device via its unique ID, board setup code
20 should instead register a static mapping that can be used to match PWM
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| /Linux-v5.15/Documentation/devicetree/bindings/leds/backlight/ |
| D | sky81452-backlight.txt | 1 SKY81452-backlight bindings
4 - compatible : Must be "skyworks,sky81452-backlight"
7 - name : Name of backlight device. Default is 'lcd-backlight'.
8 - gpios : GPIO to use to EN pin.
10 - led-sources : List of enabled channels from 0 to 5.
11 See Documentation/devicetree/bindings/leds/common.txt
12 - skyworks,ignore-pwm : Ignore both PWM input
13 - skyworks,dpwm-mode : Enable DPWM dimming mode, otherwise Analog dimming.
14 - skyworks,phase-shift : Enable phase shift mode
15 - skyworks,short-detection-threshold-volt
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