Add long-press navigation mode

.gitignore

@@ -11,3 +11,6 @@ target/*/tools/mkheader
 cscope.*
 ncscope.*
 
+# clangd
+.cache
+compile_commands.json

Documentation/dt-bindings.md

@@ -151,6 +151,16 @@ them in the device node and lk2nd will use them instead of autodetecting.
 	qcom,board-id = <0xCE08FF01 1>;
 ```
 
+### Single-key navigation
+
+On some devices, such as smartwatches, there is only one key available for
+navigation. In this case `lk2nd,single-key-navigation` property can be
+used to switch the navigation scheme to short/long press of a single key.
+
+```
+	lk2nd,single-key-navigation;
+```
+
 ## Additional drivers
 
 lk2nd provides a set of optional nodes, following a simple driver

lk2nd/device/device.c

@@ -122,6 +122,10 @@ static void parse_dtb(const void *dtb)
 	if (len < 0)
 		dprintf(CRITICAL, "Failed to read 'lk2nd,dtb-files': %d\n", len);
 
+	val = fdt_getprop(dtb, node, "lk2nd,single-key-navigation", &len);
+	if (len >= 0)
+		lk2nd_dev.single_key = true;
+
 	dprintf(INFO, "Detected device: %s (compatible: %s)\n",
 		lk2nd_dev.model, lk2nd_dev.compatible);
 

lk2nd/device/device.h

@@ -2,6 +2,8 @@
 #ifndef LK2ND_DEVICE_DEVICE_H
 #define LK2ND_DEVICE_DEVICE_H
 
+#include <stdbool.h>
+
 struct lk2nd_panel {
 	const char *name;
 	const char *old_compatible;
@@ -23,6 +25,7 @@ struct lk2nd_device {
 	const char *battery;
 
 	const char *const *dtbfiles;
+	bool single_key;
 
 	struct lk2nd_panel panel;
 

lk2nd/device/dts/msm8226/apq8026-asus-sparrow.dts

@@ -12,5 +12,6 @@
 	model = "ASUS ZenWatch 2";
 	compatible = "asus,sparrow";
 
+	lk2nd,single-key-navigation;
 	lk2nd,dtb-files = "apq8026-asus-sparrow";
 };

lk2nd/device/dts/msm8226/apq8026-huawei-sturgeon.dts

@@ -12,6 +12,7 @@
 	model = "Huawei Watch";
 	compatible = "huawei,sturgeon";
 
+	lk2nd,single-key-navigation;
 	lk2nd,dtb-files = "apq8026-huawei-sturgeon";
 
 	gpio-keys {

lk2nd/device/dts/msm8226/apq8026-lg-lenok.dts

@@ -15,6 +15,7 @@
 	model = "LG G Watch R";
 	compatible = "lg,lenok";
 
+	lk2nd,single-key-navigation;
 	lk2nd,dtb-files = "apq8026-lg-lenok";
 };
 

lk2nd/device/menu/menu.c

@@ -85,16 +85,30 @@ static uint16_t lk2nd_boot_pressed_key(void)
 	return 0;
 }
 
+#define LONG_PRESS_DURATION 1000
+
 static uint16_t wait_key(void)
 {
 	uint16_t keycode = 0;
+	int press_start = 0;
+	int press_duration;
 
 	while (!(keycode = lk2nd_boot_pressed_key()))
 		thread_sleep(1);
 
-	while (lk2nd_keys_pressed(keycode))
+	press_start = current_time();
+
+	while (lk2nd_keys_pressed(keycode)) {
 		thread_sleep(1);
 
+		press_duration = current_time() - press_start;
+		if (lk2nd_dev.single_key && press_duration > LONG_PRESS_DURATION)
+			return KEY_POWER;
+	}
+
+	if (lk2nd_dev.single_key)
+		keycode = KEY_VOLUMEDOWN;
+
 	/* A small debounce delay */
 	thread_sleep(5);
 
@@ -180,8 +194,13 @@ void display_fastboot_menu(void)
 	y_menu = y;
 	y += incr * (ARRAY_SIZE(menu_options) + 1);
 
-	fbcon_puts_ln(SILVER, y, incr, true, "Volume keys to navigate.");
-	fbcon_puts_ln(SILVER, y, incr, true, "Power key to select.");
+	if (lk2nd_dev.single_key) {
+		fbcon_puts_ln(SILVER, y, incr, true, "Short press to navigate.");
+		fbcon_puts_ln(SILVER, y, incr, true, "Long press to select.");
+	} else {
+		fbcon_puts_ln(SILVER, y, incr, true, "Volume keys to navigate.");
+		fbcon_puts_ln(SILVER, y, incr, true, "Power key to select.");
+	}
 
 	/*
 	 * Draw the device-specific information at the bottom of the screen