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105 lines
3.5 KiB
Diff
105 lines
3.5 KiB
Diff
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From e8a650fc27bf1e7d858c997fddd9944e6c222260 Mon Sep 17 00:00:00 2001
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From: Aaron Shaw <shawaj@gmail.com>
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Date: Thu, 4 Jan 2018 15:02:16 +0000
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Subject: [PATCH 157/454] add gpio-key overlay (#2329)
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An overlay that allows a Linux key to be bound to a GPIO.
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---
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arch/arm/boot/dts/overlays/Makefile | 1 +
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arch/arm/boot/dts/overlays/README | 21 ++++++++
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.../boot/dts/overlays/gpio-key-overlay.dts | 48 +++++++++++++++++++
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3 files changed, 70 insertions(+)
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create mode 100644 arch/arm/boot/dts/overlays/gpio-key-overlay.dts
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--- a/arch/arm/boot/dts/overlays/Makefile
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+++ b/arch/arm/boot/dts/overlays/Makefile
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@@ -31,6 +31,7 @@ dtbo-$(CONFIG_ARCH_BCM2835) += \
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googlevoicehat-soundcard.dtbo \
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gpio-ir.dtbo \
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gpio-ir-tx.dtbo \
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+ gpio-key.dtbo \
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gpio-poweroff.dtbo \
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gpio-shutdown.dtbo \
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hifiberry-amp.dtbo \
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--- a/arch/arm/boot/dts/overlays/README
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+++ b/arch/arm/boot/dts/overlays/README
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@@ -515,6 +515,27 @@ Params: gpio_pin Output G
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Default is "0" (active-high).
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+Name: gpio-key
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+Info: This is a generic overlay for activating GPIO keypresses using
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+ the gpio-keys library and this dtoverlay. Multiple keys can be
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+ set up using multiple calls to the overlay for configuring
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+ additional buttons or joysticks. You can see available keycodes
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+ at https://github.com/torvalds/linux/blob/v4.12/include/uapi/
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+ linux/input-event-codes.h#L64
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+Load: dtoverlay=gpio-key,<param>=<val>
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+Params: gpio GPIO pin to trigger on (default 3)
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+ active_low When this is 1 (active low), a falling
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+ edge generates a key down event and a
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+ rising edge generates a key up event.
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+ When this is 0 (active high), this is
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+ reversed. The default is 1 (active low)
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+ gpio_pull Desired pull-up/down state (off, down, up)
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+ Default is "up". Note that the default pin
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+ (GPIO3) has an external pullup
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+ label Set a label for the key
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+ keycode Set the key code for the button
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+
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+
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Name: gpio-poweroff
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Info: Drives a GPIO high or low on poweroff (including halt). Enabling this
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overlay will prevent the ability to boot by driving GPIO3 low.
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--- /dev/null
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+++ b/arch/arm/boot/dts/overlays/gpio-key-overlay.dts
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@@ -0,0 +1,48 @@
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+// Definitions for gpio-key module
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+/dts-v1/;
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+/plugin/;
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+
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+/ {
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+ compatible = "brcm,bcm2708";
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+
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+ fragment@0 {
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+ // Configure the gpio pin controller
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+ target = <&gpio>;
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+ __overlay__ {
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+ pin_state: button_pins@0 {
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+ brcm,pins = <3>; // gpio number
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+ brcm,function = <0>; // 0 = input, 1 = output
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+ brcm,pull = <2>; // 0 = none, 1 = pull down, 2 = pull up
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+ };
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+ };
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+ };
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+ fragment@1 {
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+ target-path = "/";
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+ __overlay__ {
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+ button: button@0 {
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+ compatible = "gpio-keys";
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+ pinctrl-names = "default";
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+ pinctrl-0 = <&pin_state>;
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+ status = "okay";
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+
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+ key: key {
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+ linux,code = <116>;
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+ gpios = <&gpio 3 1>;
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+ label = "KEY_POWER";
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+ };
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+ };
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+ };
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+ };
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+
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+ __overrides__ {
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+ gpio = <&key>,"gpios:4",
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+ <&button>,"reg:0",
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+ <&pin_state>,"brcm,pins:0",
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+ <&pin_state>,"reg:0";
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+ label = <&key>,"label";
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+ keycode = <&key>,"linux,code:0";
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+ gpio_pull = <&pin_state>,"brcm,pull:0";
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+ active_low = <&key>,"gpios:8";
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+ };
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+
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+};
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