66 lines
2.1 KiB
C
66 lines
2.1 KiB
C
/*
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* Copyright (c) 2024 The ZMK Contributors
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*
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* SPDX-License-Identifier: MIT
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*/
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#include <zephyr/kernel.h>
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#include <zephyr/device.h>
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#include <zephyr/init.h>
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#include <zephyr/drivers/gpio.h>
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#include <zephyr/sys/sys_io.h>
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#include <zephyr/devicetree.h>
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/* The PMU(BQ24075) enable pin(LOW active) on M60 is controlled by a NAND gate.
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* Partial reverse engineering shows:
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* P0.28 affects the NAND gate.
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* The button affects P0.27 the NAND gate.
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* P0.03 is detection pin for charging state(possibly attached to PMU LED pin).
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*/
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static const struct device *p0 = DEVICE_DT_GET(DT_NODELABEL(gpio0));
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static inline void power_off(void) {
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gpio_pin_set(p0, 28, 0); // turn off the PMU battery path
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}
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static inline bool is_charging(void) {
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// 0: charging
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return gpio_pin_get_raw(p0, 3) == 0;
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}
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static void button_pressed(const struct device *dev, struct gpio_callback *cb, uint32_t pins) {
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// wait the button stable at 0 so the keyboard won't be powered up accidentally
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k_sleep(K_SECONDS(1));
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if (!is_charging()) {
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power_off();
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}
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}
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static int pinmux_nrf52840_m2_init(void) {
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// back button
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// NOTE: if used to power off the keyboard, make sure the action is done
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// AFTER the button is released.
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//
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// To wake up the keyboard from sleep with this button, must use interrupt.
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// To avoid the callback triggered after keyboard woke up(powering off the
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// keyboard), must use GPIO_INT_EDGE_FALLING(trigger on button pressed).
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gpio_pin_interrupt_configure(p0, 27, GPIO_INT_EDGE_FALLING);
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// GPIO 0.28(LDO control) is already configured by bootloader,
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// so configuring it here is just an ensurance.
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gpio_pin_configure(p0, 28, GPIO_OUTPUT_ACTIVE | GPIO_PULL_UP | GPIO_OPEN_DRAIN);
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// this is the pin for charging detection
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gpio_pin_configure(p0, 3, GPIO_INPUT | GPIO_PULL_UP);
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// setup the interrupt handler to poweroff the keyboard
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static struct gpio_callback button_cb;
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gpio_init_callback(&button_cb, button_pressed, BIT(27));
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gpio_add_callback(p0, &button_cb);
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return 0;
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}
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SYS_INIT(pinmux_nrf52840_m2_init, APPLICATION, CONFIG_APPLICATION_INIT_PRIORITY);
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