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Documentation/devicetree/bindings/leds/backlight/kinetic,ktd2801.yaml
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| # SPDX-License-Identifier: (GPL-2.0 OR BSD-2-Clause) | ||
| %YAML 1.2 | ||
| --- | ||
| $id: http://devicetree.org/schemas/leds/backlight/kinetic,ktd2801.yaml# | ||
| $schema: http://devicetree.org/meta-schemas/core.yaml# | ||
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| title: Kinetic Technologies KTD2801 one-wire backlight | ||
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| maintainers: | ||
| - Duje Mihanović <duje.mihanovic@skole.hr> | ||
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| description: | | ||
| The Kinetic Technologies KTD2801 is a LED backlight driver controlled | ||
| by a single GPIO line. The driver can be controlled with a PWM signal | ||
| or by pulsing the GPIO line to set the backlight level. This is called | ||
| "ExpressWire". | ||
| allOf: | ||
| - $ref: common.yaml# | ||
|
|
||
| properties: | ||
| compatible: | ||
| const: kinetic,ktd2801 | ||
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| ctrl-gpios: | ||
| maxItems: 1 | ||
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| default-brightness: true | ||
| max-brightness: true | ||
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| required: | ||
| - compatible | ||
| - ctrl-gpios | ||
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| additionalProperties: false | ||
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| examples: | ||
| - | | ||
| #include <dt-bindings/gpio/gpio.h> | ||
| backlight { | ||
| compatible = "kinetic,ktd2801"; | ||
| ctrl-gpios = <&gpio 97 GPIO_ACTIVE_HIGH>; | ||
| max-brightness = <210>; | ||
| default-brightness = <100>; | ||
| }; |
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| Original file line number | Diff line number | Diff line change |
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| @@ -0,0 +1,72 @@ | ||
| // SPDX-License-Identifier: GPL-2.0-only | ||
| /* | ||
| * Shared library for Kinetic's ExpressWire protocol. | ||
| * This protocol works by pulsing the ExpressWire IC's control GPIO. | ||
| * ktd2692 and ktd2801 are known to use this protocol. | ||
| */ | ||
|
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| #include <linux/bits.h> | ||
| #include <linux/delay.h> | ||
| #include <linux/export.h> | ||
| #include <linux/gpio/consumer.h> | ||
| #include <linux/types.h> | ||
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| #include <linux/leds-expresswire.h> | ||
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| void expresswire_power_off(struct expresswire_common_props *props) | ||
| { | ||
| gpiod_set_value_cansleep(props->ctrl_gpio, 0); | ||
| usleep_range(props->timing.poweroff_us, props->timing.poweroff_us * 2); | ||
| } | ||
| EXPORT_SYMBOL_NS_GPL(expresswire_power_off, EXPRESSWIRE); | ||
|
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| void expresswire_enable(struct expresswire_common_props *props) | ||
| { | ||
| gpiod_set_value(props->ctrl_gpio, 1); | ||
| udelay(props->timing.detect_delay_us); | ||
| gpiod_set_value(props->ctrl_gpio, 0); | ||
| udelay(props->timing.detect_us); | ||
| gpiod_set_value(props->ctrl_gpio, 1); | ||
| } | ||
| EXPORT_SYMBOL_NS_GPL(expresswire_enable, EXPRESSWIRE); | ||
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| void expresswire_start(struct expresswire_common_props *props) | ||
| { | ||
| gpiod_set_value(props->ctrl_gpio, 1); | ||
| udelay(props->timing.data_start_us); | ||
| } | ||
| EXPORT_SYMBOL_NS_GPL(expresswire_start, EXPRESSWIRE); | ||
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| void expresswire_end(struct expresswire_common_props *props) | ||
| { | ||
| gpiod_set_value(props->ctrl_gpio, 0); | ||
| udelay(props->timing.end_of_data_low_us); | ||
| gpiod_set_value(props->ctrl_gpio, 1); | ||
| udelay(props->timing.end_of_data_high_us); | ||
| } | ||
| EXPORT_SYMBOL_NS_GPL(expresswire_end, EXPRESSWIRE); | ||
|
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| void expresswire_set_bit(struct expresswire_common_props *props, bool bit) | ||
| { | ||
| if (bit) { | ||
| gpiod_set_value(props->ctrl_gpio, 0); | ||
| udelay(props->timing.short_bitset_us); | ||
| gpiod_set_value(props->ctrl_gpio, 1); | ||
| udelay(props->timing.long_bitset_us); | ||
| } else { | ||
| gpiod_set_value(props->ctrl_gpio, 0); | ||
| udelay(props->timing.long_bitset_us); | ||
| gpiod_set_value(props->ctrl_gpio, 1); | ||
| udelay(props->timing.short_bitset_us); | ||
| } | ||
| } | ||
| EXPORT_SYMBOL_NS_GPL(expresswire_set_bit, EXPRESSWIRE); | ||
|
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| void expresswire_write_u8(struct expresswire_common_props *props, u8 val) | ||
| { | ||
| expresswire_start(props); | ||
| for (int i = 7; i >= 0; i--) | ||
| expresswire_set_bit(props, val & BIT(i)); | ||
| expresswire_end(props); | ||
| } | ||
| EXPORT_SYMBOL_NS_GPL(expresswire_write_u8, EXPRESSWIRE); |
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