initial (partial) commit

src/libmsettings/makefile

@@ -0,0 +1,32 @@
+ifeq (,$(CROSS_COMPILE))
+$(error missing CROSS_COMPILE for this toolchain)
+endif
+ifeq (,$(PREFIX))
+$(error missing PREFIX for this toolchain)
+endif
+
+TARGET=msettings
+
+.PHONY: build
+.PHONY: clean
+
+CC = $(CROSS_COMPILE)gcc
+
+SYSROOT     := $(shell $(CC) --print-sysroot)
+
+INCLUDEDIR = $(SYSROOT)/usr/include
+CFLAGS = -I$(INCLUDEDIR)
+LDFLAGS = -ldl -lrt -s
+
+OPTM=-Ofast
+
+build: 
+	$(CC) -c -Werror -fpic "$(TARGET).c" -Wl,--no-as-needed $(LDFLAGS)
+	$(CC) -shared -o "lib$(TARGET).so" "$(TARGET).o" $(LDFLAGS)
+	cp "$(TARGET).h" "$(PREFIX)/include"
+	cp "lib$(TARGET).so" "$(PREFIX)/lib"
+clean:
+	rm -f *.o
+	rm -f "lib$(TARGET).so"
+	rm -f $(PREFIX)/include/$(TARGET).h
+	rm -f $(PREFIX)/lib/lib$(TARGET).so

src/libmsettings/msettings.c

@@ -0,0 +1,142 @@
+#include <stdio.h>
+#include <stdlib.h>
+#include <unistd.h>
+#include <fcntl.h>
+#include <sys/mman.h>
+#include <errno.h>
+#include <sys/stat.h>
+#include <dlfcn.h>
+#include <string.h>
+
+#include "msettings.h"
+
+///////////////////////////////////////
+
+typedef struct Settings {
+	int version; // future proofing
+	int brightness;
+	int headphones;
+	int speaker;
+	int unused[3]; // for future use
+	int jack; // NOTE: doesn't really need to be persisted but still needs to be shared
+} Settings;
+static Settings DefaultSettings = {
+	.version = 1,
+	.brightness = 2,
+	.headphones = 4,
+	.speaker = 8,
+	.jack = 0,
+};
+static Settings* settings;
+
+#define SHM_KEY "/SharedSettings"
+// static char SettingsPath[256];
+static char* SettingsPath = "/mnt/sdcard/.userdata/rg35xx/msettings.bin";
+static int shm_fd = -1;
+static int is_host = 0;
+static int shm_size = sizeof(Settings);
+
+void InitSettings(void) {
+	// sprintf(SettingsPath, "%s/msettings.bin", getenv("USERDATA_PATH"));
+	
+	shm_fd = shm_open(SHM_KEY, O_RDWR | O_CREAT | O_EXCL, 0644); // see if it exists
+	if (shm_fd==-1 && errno==EEXIST) { // already exists
+		puts("Settings client");
+		shm_fd = shm_open(SHM_KEY, O_RDWR, 0644);
+		settings = mmap(NULL, shm_size, PROT_READ | PROT_WRITE, MAP_SHARED, shm_fd, 0);
+	}
+	else { // host
+		puts("Settings host");
+		is_host = 1;
+		// we created it so set initial size and populate
+		ftruncate(shm_fd, shm_size);
+		settings = mmap(NULL, shm_size, PROT_READ | PROT_WRITE, MAP_SHARED, shm_fd, 0);
+		
+		int fd = open(SettingsPath, O_RDONLY);
+		if (fd>=0) {
+			read(fd, settings, shm_size);
+			// TODO: use settings->version for future proofing
+			close(fd);
+		}
+		else {
+			// load defaults
+			memcpy(settings, &DefaultSettings, shm_size);
+		}
+	}
+	printf("brightness: %i\nspeaker: %i \n", settings->brightness, settings->speaker);
+
+	SetVolume(GetVolume());
+	SetBrightness(GetBrightness());
+}
+void QuitSettings(void) {
+	munmap(settings, shm_size);
+	if (is_host) shm_unlink(SHM_KEY);
+}
+static inline void SaveSettings(void) {
+	int fd = open(SettingsPath, O_CREAT|O_WRONLY, 0644);
+	if (fd>=0) {
+		write(fd, settings, shm_size);
+		close(fd);
+		sync();
+	}
+}
+
+int GetBrightness(void) { // 0-10
+	return settings->brightness;
+}
+void SetBrightness(int value) {
+	int raw;
+	switch (value) {
+		case 0: raw=8; break;
+		case 1: raw=16; break;
+		case 2: raw=32; break;
+		case 3: raw=64; break;
+		case 4: raw=128; break;
+		case 5: raw=192; break;
+		case 6: raw=256; break;
+		case 7: raw=384; break;
+		case 8: raw=512; break;
+		case 9: raw=768; break;
+		case 10: raw=1024; break;
+	}
+	SetRawBrightness(raw);
+	settings->brightness = value;
+	SaveSettings();
+}
+
+int GetVolume(void) { // 0-20
+	return settings->jack ? settings->headphones : settings->speaker;
+}
+void SetVolume(int value) {
+	if (settings->jack) settings->headphones = value;
+	else settings->speaker = value;
+	
+	int raw = value * 2;
+	SetRawVolume(raw);
+	SaveSettings();
+}
+
+void SetRawBrightness(int val) { // 0 - 1024
+	int fd = open("/sys/class/backlight/backlight.2/brightness", O_WRONLY);
+	if (fd>=0) {
+		dprintf(fd,"%d",val);
+		close(fd);
+	}
+}
+void SetRawVolume(int val) { // 0 - 40
+	int fd = open("/sys/class/volume/value", O_WRONLY);
+	if (fd>=0) {
+		dprintf(fd,"%d",val);
+		close(fd);
+	}
+}
+
+int GetJack(void) {
+	// return /sys/class/switch/h2w/state==1`
+	// access("/dev/dsp1", F_OK)==0
+	return settings->jack;
+}
+void SetJack(int value) { // monitored and set by thread in keymon
+	settings->jack = value;
+	SetVolume(GetVolume());
+}

src/libmsettings/msettings.h

@@ -0,0 +1,19 @@
+#ifndef __msettings_h__
+#define __msettings_h__
+
+void InitSettings(void);
+void QuitSettings(void);
+
+int GetBrightness(void);
+int GetVolume(void);
+
+void SetRawBrightness(int value); // 0-1024
+void SetRawVolume(int value); // 0-40
+
+void SetBrightness(int value); // 0-10
+void SetVolume(int value); // 0-20
+
+int GetJack(void);
+void SetJack(int value); // 0-1
+
+#endif  // __msettings_h__