New port: FiiO M3K

Most credit goes to:  Roman Skylarov
Additional integration and refactoring by myself.

 *** COMPLETELY UNTESTED ***

Change-Id: Ia64c36d92e0214c6b15f7a868df286f8113ea27b

firmware/target/hosted/backlight-target.h

@@ -21,16 +21,20 @@
 #ifndef _BACKLIGHT_TARGET_H_
 #define _BACKLIGHT_TARGET_H_
 
-
 #include <stdbool.h>
 
-
 /* See backlight.c */
 bool backlight_hw_init(void);
 void backlight_hw_on(void);
 void backlight_hw_off(void);
 void backlight_hw_brightness(int brightness);
 
-
+#ifdef HAVE_BUTTON_LIGHT
+void buttonlight_hw_on(void);
+void buttonlight_hw_off(void);
+#ifdef HAVE_BUTTONLIGHT_BRIGHTNESS
+void buttonlight_hw_brightness(int brightness);
+#endif
 #endif
 
+#endif

firmware/target/hosted/fiio/button-fiio.c

@@ -0,0 +1,308 @@
+/***************************************************************************
+ *             __________               __   ___
+ *   Open      \______   \ ____   ____ |  | _\_ |__   _______  ___
+ *   Source     |       _//  _ \_/ ___\|  |/ /| __ \ /  _ \  \/  /
+ *   Jukebox    |    |   (  <_> )  \___|    < | \_\ (  <_> > <  <
+ *   Firmware   |____|_  /\____/ \___  >__|_ \|___  /\____/__/\_ \
+ *                     \/            \/     \/    \/            \/
+ *
+ * Copyright (C) 2017 Marcin Bukat
+ * Copyright (C) 2019 Roman Stolyarov
+ *
+ * This program is free software; you can redistribute it and/or
+ * modify it under the terms of the GNU General Public License
+ * as published by the Free Software Foundation; either version 2
+ * of the License, or (at your option) any later version.
+ *
+ * This software is distributed on an "AS IS" basis, WITHOUT WARRANTY OF ANY
+ * KIND, either express or implied.
+ *
+ ****************************************************************************/
+#include <poll.h>
+//#include <dir.h>
+#include <errno.h>
+#include <unistd.h>
+#include <sys/types.h>
+#include <linux/input.h>
+#include <fcntl.h>
+#include <string.h>
+#include <stdlib.h>
+
+#include "sysfs.h"
+#include "button.h"
+#include "button-target.h"
+#include "panic.h"
+
+#include "kernel.h"
+#include "backlight.h"
+#include "backlight-target.h"
+
+static int key_enter_delay = 0;
+static int key_right_delay = 0;
+static int key_left_delay = 0;
+static int key_power_delay = 0;
+static int key_home_delay = 0;
+static int key_backspace_delay = 0;
+static int key_leftbrace_delay = 0;
+static int key_rightbrace_delay = 0;
+static int key_up_delay = 0;
+static int key_down_delay = 0;
+static int key_f12_delay = 0;
+
+#define NR_POLL_DESC	2
+static struct pollfd poll_fds[NR_POLL_DESC];
+
+#define DEF_DELAY	5
+
+static int button_map_on(int keycode)
+{
+    switch(keycode)
+    {
+        case KEY_ENTER:
+            key_enter_delay = DEF_DELAY;
+            return BUTTON_PLAY;
+        case KEY_F10:
+            key_enter_delay = 0;
+            return BUTTON_PLAY;
+
+        case KEY_RIGHT:
+            key_right_delay = DEF_DELAY;
+            return BUTTON_VOL_DOWN;
+        case KEY_F7:
+            key_right_delay = 0;
+            return BUTTON_VOL_DOWN;
+
+        case KEY_LEFT:
+            key_left_delay = DEF_DELAY;
+            return BUTTON_VOL_UP;
+        case KEY_F6:
+            key_left_delay = 0;
+            return BUTTON_VOL_UP;
+
+        case KEY_POWER:
+            key_power_delay = DEF_DELAY;
+            return BUTTON_POWER;
+        case KEY_F8:
+            key_power_delay = 0;
+            return BUTTON_POWER;
+        
+        case KEY_HOME:
+            key_home_delay = DEF_DELAY;
+            return BUTTON_OPTION;
+        case KEY_F9:
+            key_home_delay = 0;
+            return BUTTON_OPTION;
+
+        case KEY_BACKSPACE:
+            key_backspace_delay = DEF_DELAY;
+            return BUTTON_HOME;
+        case KEY_NUMLOCK:
+            key_backspace_delay = 0;
+            return BUTTON_HOME;
+
+        case KEY_LEFTBRACE:
+            key_leftbrace_delay = DEF_DELAY;
+            return BUTTON_PREV;
+        case KEY_F5:
+            key_leftbrace_delay = 0;
+            return BUTTON_PREV;
+
+        case KEY_RIGHTBRACE:
+            key_rightbrace_delay = DEF_DELAY;
+            return BUTTON_NEXT;
+        case KEY_F4:
+            key_rightbrace_delay = 0;
+            return BUTTON_NEXT;
+
+        case KEY_UP:
+            if (!key_up_delay) key_up_delay = DEF_DELAY;
+            return BUTTON_UP;
+
+        case KEY_DOWN:
+            if (!key_down_delay) key_down_delay = DEF_DELAY;
+            return BUTTON_DOWN;
+
+        case KEY_F12:
+            key_f12_delay = DEF_DELAY;
+            //return BUTTON_UNLOCK;
+            return 0;
+
+        default:
+            return 0;
+    }
+}
+
+static int button_map_off(int keycode)
+{
+    switch(keycode)
+    {
+        case KEY_F10:
+            return BUTTON_PLAY;
+
+        case KEY_F7:
+            return BUTTON_VOL_DOWN;
+
+        case KEY_F6:
+            return BUTTON_VOL_UP;
+
+        case KEY_F8:
+            return BUTTON_POWER;
+        
+        case KEY_F9:
+            return BUTTON_OPTION;
+
+        case KEY_NUMLOCK:
+            return BUTTON_HOME;
+
+        case KEY_F5:
+            return BUTTON_PREV;
+
+        case KEY_F4:
+            return BUTTON_NEXT;
+
+        default:
+            return 0;
+    }
+}
+
+static int button_map_timer(void)
+{
+  int map = 0;
+  
+  if (key_enter_delay)
+  {
+    if (--key_enter_delay == 0) map |= BUTTON_PLAY;
+  }
+  if (key_right_delay)
+  {
+    if (--key_right_delay == 0) map |= BUTTON_VOL_DOWN;
+  }
+  if (key_left_delay)
+  {
+    if (--key_left_delay == 0) map |= BUTTON_VOL_UP;
+  }
+  if (key_power_delay)
+  {
+    if (--key_power_delay == 0) map |= BUTTON_POWER;
+  }
+  if (key_home_delay)
+  {
+    if (--key_home_delay == 0) map |= BUTTON_OPTION;
+  }
+  if (key_backspace_delay)
+  {
+    if (--key_backspace_delay == 0) map |= BUTTON_HOME;
+  }
+  if (key_leftbrace_delay)
+  {
+    if (--key_leftbrace_delay == 0) map |= BUTTON_PREV;
+  }
+  if (key_rightbrace_delay)
+  {
+    if (--key_rightbrace_delay == 0) map |= BUTTON_NEXT;
+  }
+  if (key_up_delay)
+  {
+    if (--key_up_delay == 0) map |= BUTTON_UP;
+  }
+  if (key_down_delay)
+  {
+    if (--key_down_delay == 0) map |= BUTTON_DOWN;
+  }
+  if (key_f12_delay)
+  {
+    if (--key_f12_delay == 0) map |= 0; //BUTTON_UNLOCK
+  }
+
+  return map;
+}
+
+void button_init_device(void)
+{
+    const char * const input_devs[] = {
+        "/dev/input/event0",
+        "/dev/input/event1",
+    };
+
+    for(int i = 0; i < NR_POLL_DESC; i++)
+    {
+        int fd = open(input_devs[i], O_RDWR);
+
+        if(fd < 0)
+        {
+            panicf("Cannot open input device: %s\n", input_devs[i]);
+        }
+
+        poll_fds[i].fd = fd;
+        poll_fds[i].events = POLLIN;
+        poll_fds[i].revents = 0;
+    }
+}
+
+int button_read_device(void)
+{
+    static int button_bitmap = 0;
+    static int map;
+    struct input_event event;
+
+    /* check if there are any events pending and process them */
+    while(poll(poll_fds, NR_POLL_DESC, 0))
+    {
+        for(int i = 0; i < NR_POLL_DESC; i++)
+        {
+            /* read only if non-blocking */
+            if(poll_fds[i].revents & POLLIN)
+            {
+                int size = read(poll_fds[i].fd, &event, sizeof(event));
+                if(size == (int)sizeof(event))
+                {
+                    if(event.type == EV_KEY)
+                    {
+                        int keycode = event.code;
+
+                        /* event.value == 1 means press
+                         * event.value == 0 means release
+                         */
+                        bool press = event.value ? true : false;
+
+                        if(press)
+                        {
+                            map = button_map_on(keycode);
+                            if(map) button_bitmap |= map;
+                        }
+                        else
+                        {
+                            map = button_map_off(keycode);
+                            if(map) button_bitmap &= ~map;
+                        }
+                    }
+                }
+            }
+        }
+    }
+
+    map = button_map_timer();
+    if(map) button_bitmap &= ~map;
+
+    return button_bitmap;
+}
+
+bool headphones_inserted(void)
+{
+    int status = 0;
+    const char * const sysfs_hs_switch = "/sys/class/misc/axp173/headset_state";
+
+    sysfs_get_int(sysfs_hs_switch, &status);
+    if (status) return true;
+
+    return false;
+}
+
+void button_close_device(void)
+{
+    /* close descriptors */
+    for(int i = 0; i < NR_POLL_DESC; i++)
+    {
+        close(poll_fds[i].fd);
+    }
+}

firmware/target/hosted/fiio/button-target.h

@@ -0,0 +1,50 @@
+/***************************************************************************
+ *             __________               __   ___.
+ *   Open      \______   \ ____   ____ |  | _\_ |__   _______  ___
+ *   Source     |       _//  _ \_/ ___\|  |/ /| __ \ /  _ \  \/  /
+ *   Jukebox    |    |   (  <_> )  \___|    < | \_\ (  <_> > <  <
+ *   Firmware   |____|_  /\____/ \___  >__|_ \|___  /\____/__/\_ \
+ *                     \/            \/     \/    \/            \/
+ *
+ * Copyright (C) 2019 by Roman Stolyarov
+ *
+ * This program is free software; you can redistribute it and/or
+ * modify it under the terms of the GNU General Public License
+ * as published by the Free Software Foundation; either version 2
+ * of the License, or (at your option) any later version.
+ *
+ * This software is distributed on an "AS IS" basis, WITHOUT WARRANTY OF ANY
+ * KIND, either express or implied.
+ *
+ ****************************************************************************/
+#ifndef _BUTTON_TARGET_H_
+#define _BUTTON_TARGET_H_
+
+/* Main unit's buttons */
+#define BUTTON_POWER      0x00000001
+#define BUTTON_HOME       0x00000002
+#define BUTTON_OPTION     0x00000004
+#define BUTTON_PREV       0x00000008
+#define BUTTON_NEXT       0x00000010
+#define BUTTON_PLAY       0x00000020
+#define BUTTON_VOL_UP     0x00000040
+#define BUTTON_VOL_DOWN   0x00000080
+#define BUTTON_UP         0x00000100
+#define BUTTON_DOWN       0x00000200
+
+#define BUTTON_LEFT  0
+#define BUTTON_RIGHT 0
+
+#define BUTTON_MAIN  (BUTTON_POWER | BUTTON_HOME | BUTTON_OPTION | BUTTON_PREV | \
+                      BUTTON_NEXT | BUTTON_PLAY | BUTTON_VOL_UP | BUTTON_VOL_DOWN | \
+                      BUTTON_UP | BUTTON_DOWN)
+
+#define BUTTON_LEFT      BUTTON_PREV
+#define BUTTON_RIGHT     BUTTON_NEXT
+
+/* Software power-off */
+#define POWEROFF_BUTTON BUTTON_POWER
+#define POWEROFF_COUNT  25
+
+#endif /* _BUTTON_TARGET_H_ */
+

firmware/target/hosted/fiio/buttonlight-fiio.c

@@ -0,0 +1,57 @@
+/***************************************************************************
+ *             __________               __   ___
+ *   Open      \______   \ ____   ____ |  | _\_ |__   _______  ___
+ *   Source     |       _//  _ \_/ ___\|  |/ /| __ \ /  _ \  \/  /
+ *   Jukebox    |    |   (  <_> )  \___|    < | \_\ (  <_> > <  <
+ *   Firmware   |____|_  /\____/ \___  >__|_ \|___  /\____/__/\_ \
+ *                     \/            \/     \/    \/            \/
+ *
+ * Copyright (C) 2017 Marcin Bukat
+ *
+ * This program is free software; you can redistribute it and/or
+ * modify it under the terms of the GNU General Public License
+ * as published by the Free Software Foundation; either version 2
+ * of the License, or (at your option) any later version.
+ *
+ * This software is distributed on an "AS IS" basis, WITHOUT WARRANTY OF ANY
+ * KIND, either express or implied.
+ *
+ ****************************************************************************/
+#include <sys/types.h>
+#include <sys/stat.h>
+#include <fcntl.h>
+#include <stdbool.h>
+#include <unistd.h>
+#include <string.h>
+#include <stdio.h>
+#include "config.h"
+#include "backlight-target.h"
+#include "sysfs.h"
+#include "panic.h"
+#include "lcd.h"
+
+static const char * const sysfs_kb_brightness =
+    "/sys/class/jz_pwm_dev/jz_pwm_dev4/duty_ratio";
+
+static const char * const sysfs_kb_power =
+    "/sys/class/jz_pwm_dev/jz_pwm_dev4/enable";
+
+void buttonlight_hw_on(void)
+{
+    sysfs_set_int(sysfs_kb_power, 1);
+}
+
+void buttonlight_hw_off(void)
+{
+    sysfs_set_int(sysfs_kb_power, 0);
+}
+
+void buttonlight_hw_brightness(int brightness)
+{
+    if (brightness > MAX_BRIGHTNESS_SETTING)
+        brightness = MAX_BRIGHTNESS_SETTING;
+    if (brightness < MIN_BRIGHTNESS_SETTING)
+        brightness = MIN_BRIGHTNESS_SETTING;
+
+    sysfs_set_int(sysfs_kb_brightness, brightness);
+}

firmware/target/hosted/fiio/debug-fiio.c

@@ -0,0 +1 @@
+#include "../agptek/debug-agptek.c"

firmware/target/hosted/fiio/fiio.make

@@ -0,0 +1,49 @@
+#             __________               __   ___.
+#   Open      \______   \ ____   ____ |  | _\_ |__   _______  ___
+#   Source     |       _//  _ \_/ ___\|  |/ /| __ \ /  _ \  \/  /
+#   Jukebox    |    |   (  <_> )  \___|    < | \_\ (  <_> > <  <
+#   Firmware   |____|_  /\____/ \___  >__|_ \|___  /\____/__/\_ \
+#                     \/            \/     \/    \/            \/
+# $Id$
+#
+
+INCLUDES += -I$(FIRMDIR)/include -I$(FIRMDIR)/export $(TARGET_INC) -I$(BUILDDIR) -I$(APPSDIR)
+
+SIMFLAGS += $(INCLUDES) $(DEFINES) -DHAVE_CONFIG_H $(GCCOPTS)
+
+# bootloader build is sligtly different
+ifneq (,$(findstring bootloader,$(APPSDIR)))
+
+SRC += $(call preprocess, $(APPSDIR)/SOURCES)
+CLEANOBJS += $(BUILDDIR)/bootloader.*
+
+endif #bootloader
+
+.SECONDEXPANSION: # $$(OBJ) is not populated until after this
+
+ifneq (,$(findstring bootloader,$(APPSDIR)))
+# bootloader build
+
+$(BUILDDIR)/bootloader.elf : $$(OBJ) $(FIRMLIB) $(CORE_LIBS)
+	$(call PRINTS,LD $(@F))$(CC) $(GCCOPTS) -Os -o $@ $(OBJ) \
+		-L$(BUILDDIR)/firmware -lfirmware \
+		-L$(BUILDDIR)/lib $(call a2lnk,$(CORE_LIBS)) \
+		$(LDOPTS) $(GLOBAL_LDOPTS) -Wl,--gc-sections -Wl,-Map,$(BUILDDIR)/bootloader.map
+
+$(BUILDDIR)/$(BINARY): $(BUILDDIR)/bootloader.elf
+	$(call PRINTS,OC $(@F))$(call objcopy,$^,$@)
+
+else
+# rockbox app build
+
+$(BUILDDIR)/rockbox.elf : $$(OBJ) $(FIRMLIB) $(VOICESPEEXLIB) $(CORE_LIBS)
+	$(call PRINTS,LD $(@F))$(CC) $(GCCOPTS) -Os -o $@ $(OBJ) \
+		-L$(BUILDDIR)/firmware -lfirmware \
+		-L$(RBCODEC_BLD)/codecs $(call a2lnk, $(VOICESPEEXLIB)) \
+		-L$(BUILDDIR)/lib $(call a2lnk,$(CORE_LIBS)) \
+		$(LDOPTS) $(GLOBAL_LDOPTS) -Wl,-Map,$(BUILDDIR)/rockbox.map
+
+$(BUILDDIR)/$(BINARY): $(BUILDDIR)/rockbox.elf
+	$(call PRINTS,OC $(@F))$(call objcopy,$^,$@)
+
+endif

firmware/target/hosted/fiio/lcd-target.h

@@ -0,0 +1,32 @@
+/***************************************************************************
+ *             __________               __   ___.
+ *   Open      \______   \ ____   ____ |  | _\_ |__   _______  ___
+ *   Source     |       _//  _ \_/ ___\|  |/ /| __ \ /  _ \  \/  /
+ *   Jukebox    |    |   (  <_> )  \___|    < | \_\ (  <_> > <  <
+ *   Firmware   |____|_  /\____/ \___  >__|_ \|___  /\____/__/\_ \
+ *                     \/            \/     \/    \/            \/
+ *
+ * Copyright (C) 2016 Amaury Pouly
+ *
+ * This program is free software; you can redistribute it and/or
+ * modify it under the terms of the GNU General Public License
+ * as published by the Free Software Foundation; either version 2
+ * of the License, or (at your option) any later version.
+ *
+ * This software is distributed on an "AS IS" basis, WITHOUT WARRANTY OF ANY
+ * KIND, either express or implied.
+ *
+ ****************************************************************************/
+
+#ifndef __LCD_TARGET_H__
+#define __LCD_TARGET_H__
+
+/* needs special ioctl() to redraw updated framebuffer content */
+#define LCD_OPTIMIZED_UPDATE
+#define LCD_OPTIMIZED_UPDATE_RECT
+
+extern fb_data *framebuffer; /* see lcd-fiio.c */
+#define LCD_FRAMEBUF_ADDR(col, row) (framebuffer + (row)*LCD_WIDTH + (col))
+
+extern void lcd_set_active(bool active);
+#endif /* __LCD_TARGET_H__ */

firmware/target/hosted/fiio/power-fiio.c

@@ -0,0 +1,78 @@
+/***************************************************************************
+ *             __________               __   ___.
+ *   Open      \______   \ ____   ____ |  | _\_ |__   _______  ___
+ *   Source     |       _//  _ \_/ ___\|  |/ /| __ \ /  _ \  \/  /
+ *   Jukebox    |    |   (  <_> )  \___|    < | \_\ (  <_> > <  <
+ *   Firmware   |____|_  /\____/ \___  >__|_ \|___  /\____/__/\_ \
+ *                     \/            \/     \/    \/            \/
+ *
+ * Copyright (C) 2017 by Marcin Bukat
+ *
+ * This program is free software; you can redistribute it and/or
+ * modify it under the terms of the GNU General Public License
+ * as published by the Free Software Foundation; either version 2
+ * of the License, or (at your option) any later version.
+ *
+ * This software is distributed on an "AS IS" basis, WITHOUT WARRANTY OF ANY
+ * KIND, either express or implied.
+ *
+ ****************************************************************************/
+#include <sys/types.h>
+#include <fcntl.h>
+#include <string.h>
+#include <unistd.h>
+#include <stdio.h>
+
+#include "system.h"
+#include "power.h"
+#include "panic.h"
+#include "sysfs.h"
+#include "usb.h"
+
+#include "power-fiio.h"
+
+const char * const sysfs_bat_voltage =
+    "/sys/class/power_supply/battery/voltage_now";
+
+const char * const sysfs_bat_capacity =
+    "/sys/class/power_supply/battery/capacity";
+
+const char * const sysfs_bat_status =
+    "/sys/class/power_supply/battery/status";
+
+const char * const sysfs_pow_supply =
+    "/sys/class/power_supply/ac/online";
+
+unsigned int fiio_power_input_status(void)
+{
+    int present = 0;
+    sysfs_get_int(sysfs_pow_supply, &present);
+
+    usb_enable(present ? true : false);
+
+    return present ? POWER_INPUT_USB_CHARGER : POWER_INPUT_NONE;
+}
+
+bool fiio_power_charging_status(void)
+{
+    char buf[12] = {0};
+    sysfs_get_string(sysfs_bat_status, buf, sizeof(buf));
+
+    return (strncmp(buf, "Charging", 8) == 0);
+}
+
+unsigned int fiio_power_get_battery_voltage(void)
+{
+    int battery_voltage;
+    sysfs_get_int(sysfs_bat_voltage, &battery_voltage);
+
+    return battery_voltage;
+}
+
+unsigned int fiio_power_get_battery_capacity(void)
+{
+    int battery_capacity;
+    sysfs_get_int(sysfs_bat_capacity, &battery_capacity);
+
+    return battery_capacity * 20;
+}

firmware/target/hosted/fiio/power-fiio.h

@@ -0,0 +1,31 @@
+/***************************************************************************
+ *             __________               __   ___.
+ *   Open      \______   \ ____   ____ |  | _\_ |__   _______  ___
+ *   Source     |       _//  _ \_/ ___\|  |/ /| __ \ /  _ \  \/  /
+ *   Jukebox    |    |   (  <_> )  \___|    < | \_\ (  <_> > <  <
+ *   Firmware   |____|_  /\____/ \___  >__|_ \|___  /\____/__/\_ \
+ *                     \/            \/     \/    \/            \/
+ *
+ * Copyright (C) 2017 by Marcin Bukat
+ *
+ * This program is free software; you can redistribute it and/or
+ * modify it under the terms of the GNU General Public License
+ * as published by the Free Software Foundation; either version 2
+ * of the License, or (at your option) any later version.
+ *
+ * This software is distributed on an "AS IS" basis, WITHOUT WARRANTY OF ANY
+ * KIND, either express or implied.
+ *
+ ****************************************************************************/
+#ifndef _POWER_FIIO_H_
+#define _POWER_FIIO_H_
+
+#include <stdbool.h>
+#include "config.h"
+
+unsigned int fiio_power_input_status(void);
+bool fiio_power_charging_status(void);
+unsigned int fiio_power_get_battery_voltage(void);
+unsigned int fiio_power_get_battery_capacity(void);
+#endif /* _POWER_FIIO_H_ */
+

firmware/target/hosted/fiio/powermgmt-fiio.c

@@ -0,0 +1,68 @@
+/***************************************************************************
+ *             __________               __   ___.
+ *   Open      \______   \ ____   ____ |  | _\_ |__   _______  ___
+ *   Source     |       _//  _ \_/ ___\|  |/ /| __ \ /  _ \  \/  /
+ *   Jukebox    |    |   (  <_> )  \___|    < | \_\ (  <_> > <  <
+ *   Firmware   |____|_  /\____/ \___  >__|_ \|___  /\____/__/\_ \
+ *                     \/            \/     \/    \/            \/
+ *
+ * Copyright (C) 2017 Marcin Bukat
+ *
+ * This program is free software; you can redistribute it and/or
+ * modify it under the terms of the GNU General Public License
+ * as published by the Free Software Foundation; either version 2
+ * of the License, or (at your option) any later version.
+ *
+ * This software is distributed on an "AS IS" basis, WITHOUT WARRANTY OF ANY
+ * KIND, either express or implied.
+ *
+ ****************************************************************************/
+#include "powermgmt.h"
+#include "power.h"
+#include "power-fiio.h"
+
+const unsigned short battery_level_dangerous[BATTERY_TYPES_COUNT] =
+{
+    3470
+};
+
+/* the OF shuts down at this voltage */
+const unsigned short battery_level_shutoff[BATTERY_TYPES_COUNT] =
+{
+    3400
+};
+
+/* voltages (millivolt) of 0%, 10%, ... 100% when charging disabled */
+const unsigned short percent_to_volt_discharge[BATTERY_TYPES_COUNT][11] =
+{
+    { 3400, 3639, 3697, 3723, 3757, 3786, 3836, 3906, 3980, 4050, 4159 }
+};
+
+/* voltages (millivolt) of 0%, 10%, ... 100% when charging enabled */
+const unsigned short const percent_to_volt_charge[11] =
+{
+      3485, 3780, 3836, 3857, 3890, 3930, 3986, 4062, 4158, 4185, 4196
+};
+
+unsigned int power_input_status(void)
+{
+    /* POWER_INPUT_USB_CHARGER, POWER_INPUT_NONE */
+    return fiio_power_input_status();
+}
+
+int _battery_voltage(void)
+{
+    return fiio_power_get_battery_voltage();
+}
+
+#if 0
+int _battery_level(void)
+{
+    return fiio_power_get_battery_capacity();
+}
+#endif
+
+bool charging_state(void)
+{
+    return fiio_power_charging_status();
+}

firmware/target/hosted/fiio/system-fiio.c

@@ -0,0 +1,205 @@
+/***************************************************************************
+ *             __________               __   ___.
+ *   Open      \______   \ ____   ____ |  | _\_ |__   _______  ___
+ *   Source     |       _//  _ \_/ ___\|  |/ /| __ \ /  _ \  \/  /
+ *   Jukebox    |    |   (  <_> )  \___|    < | \_\ (  <_> > <  <
+ *   Firmware   |____|_  /\____/ \___  >__|_ \|___  /\____/__/\_ \
+ *                     \/            \/     \/    \/            \/
+ *
+ * Copyright (C) 2017 Marcin Bukat
+ * Copyright (C) 2016 Amaury Pouly
+ *
+ * This program is free software; you can redistribute it and/or
+ * modify it under the terms of the GNU General Public License
+ * as published by the Free Software Foundation; either version 2
+ * of the License, or (at your option) any later version.
+ *
+ * This software is distributed on an "AS IS" basis, WITHOUT WARRANTY OF ANY
+ * KIND, either express or implied.
+ *
+ ****************************************************************************/
+#include <unistd.h>
+#include <signal.h>
+#include <string.h>
+#include <ucontext.h>
+#include <backtrace.h>
+
+#include "system.h"
+#include "mv.h"
+#include "font.h"
+#include "power.h"
+#include "button.h"
+#include "backlight-target.h"
+#include "lcd.h"
+
+#include "panic.h"
+#include <fcntl.h>
+#include <sys/ioctl.h>
+
+/* to make thread-internal.h happy */
+uintptr_t *stackbegin;
+uintptr_t *stackend;
+
+static void sig_handler(int sig, siginfo_t *siginfo, void *context)
+{
+    /* safe guard variable - we call backtrace() only on first
+     * UIE call. This prevent endless loop if backtrace() touches
+     * memory regions which cause abort
+     */
+    static bool triggered = false;
+
+    lcd_set_backdrop(NULL);
+    lcd_set_drawmode(DRMODE_SOLID);
+    lcd_set_foreground(LCD_BLACK);
+    lcd_set_background(LCD_WHITE);
+    unsigned line = 0;
+
+    lcd_setfont(FONT_SYSFIXED);
+    lcd_set_viewport(NULL);
+    lcd_clear_display();
+
+    /* get context info */
+    ucontext_t *uc = (ucontext_t *)context;
+    unsigned long pc = uc->uc_mcontext.pc;
+    unsigned long sp = uc->uc_mcontext.gregs[29];
+
+    lcd_putsf(0, line++, "%s at %08x", strsignal(sig), pc);
+
+    if(sig == SIGILL || sig == SIGFPE || sig == SIGSEGV || sig == SIGBUS || sig == SIGTRAP)
+        lcd_putsf(0, line++, "address 0x%08x", siginfo->si_addr);
+
+    if(!triggered)
+    {
+        triggered = true;
+        rb_backtrace(pc, sp, &line);
+    }
+
+#ifdef ROCKBOX_HAS_LOGF
+    lcd_putsf(0, line++, "logf:");
+    logf_panic_dump(&line);
+#endif
+
+    lcd_update();
+
+    system_exception_wait(); /* If this returns, try to reboot */
+
+    backlight_hw_off();
+    system_reboot();
+    while (1);       /* halt */
+}
+
+static int axp_hw;
+
+void power_off(void)
+{
+    backlight_hw_off();
+
+    axp_hw = open("/dev/axp173", O_RDWR);
+    if(axp_hw < 0)
+        panicf("Cannot open '/dev/axp173'");
+
+    if(ioctl(axp_hw, 0x20003323, 0) < 0)
+    {
+        panicf("Call AXP173_SHUTDOWN fail");
+    }
+    
+    close(axp_hw);
+}
+
+void system_init(void)
+{
+    int *s;
+    /* fake stack, to make thread-internal.h happy */
+    stackbegin = stackend = (uintptr_t*)&s;
+   /* catch some signals for easier debugging */
+    struct sigaction sa;
+    sigfillset(&sa.sa_mask);
+    sa.sa_flags = SA_SIGINFO;
+    sa.sa_sigaction = &sig_handler;
+    sigaction(SIGILL, &sa, NULL);
+    sigaction(SIGABRT, &sa, NULL);
+    sigaction(SIGFPE, &sa, NULL);
+    sigaction(SIGSEGV, &sa, NULL);
+    sigaction(SIGPIPE, &sa, NULL);
+    sigaction(SIGTERM, &sa, NULL);
+    sigaction(SIGBUS, &sa, NULL);
+    sigaction(SIGTERM, &sa, NULL);
+}
+
+void system_reboot(void)
+{
+    backlight_hw_off();
+    system("/sbin/reboot");
+    while (1);       /* halt */
+}
+
+void system_exception_wait(void)
+{
+    backlight_hw_on();
+    backlight_hw_brightness(DEFAULT_BRIGHTNESS_SETTING);
+    /* wait until button press and release */
+    while(button_read_device() != 0) {}
+    while(button_read_device() == 0) {}
+    while(button_read_device() != 0) {}
+    while(button_read_device() == 0) {}
+}
+
+bool hostfs_removable(IF_MD_NONVOID(int drive))
+{
+#ifdef HAVE_MULTIDRIVE
+    if (drive > 0) /* Active LOW */
+        return true;
+    else
+#endif
+        return false; /* internal: always present */
+}
+
+bool hostfs_present(IF_MD_NONVOID(int drive))
+{
+#ifdef HAVE_MULTIDRIVE
+    if (drive > 0) /* Active LOW */
+        return true; //FIXME
+    else
+#endif
+        return true; /* internal: always present */
+}
+
+#ifdef HAVE_MULTIDRIVE
+int volume_drive(int drive)
+{
+    return drive;
+}
+#endif /* HAVE_MULTIDRIVE */
+
+#ifdef CONFIG_STORAGE_MULTI
+int hostfs_driver_type(int drive)
+{
+    return drive > 0 ? STORAGE_SD_NUM : STORAGE_HOSTFS_NUM;
+}
+#endif /* CONFIG_STORAGE_MULTI */
+
+int hostfs_init(void)
+{
+    return 0;
+}
+
+int hostfs_flush(void)
+{
+    sync();
+    return 0;
+}
+
+#ifdef HAVE_HOTSWAP
+bool volume_removable(int volume)
+{
+    /* don't support more than one partition yet, so volume == drive */
+    return hostfs_removable(volume);
+}
+
+bool volume_present(int volume)
+{
+    /* don't support more than one partition yet, so volume == drive */
+    return hostfs_present(volume);
+}
+#endif
+

firmware/target/hosted/fiio/system-target.h

@@ -0,0 +1,28 @@
+/***************************************************************************
+ *             __________               __   ___.
+ *   Open      \______   \ ____   ____ |  | _\_ |__   _______  ___
+ *   Source     |       _//  _ \_/ ___\|  |/ /| __ \ /  _ \  \/  /
+ *   Jukebox    |    |   (  <_> )  \___|    < | \_\ (  <_> > <  <
+ *   Firmware   |____|_  /\____/ \___  >__|_ \|___  /\____/__/\_ \
+ *                     \/            \/     \/    \/            \/
+ *
+ * Copyright (C) 2017 Marcin Bukat
+ * Copyright (C) 2016 Amaury Pouly
+ *
+ * This program is free software; you can redistribute it and/or
+ * modify it under the terms of the GNU General Public License
+ * as published by the Free Software Foundation; either version 2
+ * of the License, or (at your option) any later version.
+ *
+ * This software is distributed on an "AS IS" basis, WITHOUT WARRANTY OF ANY
+ * KIND, either express or implied.
+ *
+ ****************************************************************************/
+#ifndef __SYSTEM_TARGET_H__
+#define __SYSTEM_TARGET_H__
+
+#include "kernel-unix.h"
+#include "system-hosted.h"
+
+#define NEED_GENERIC_BYTESWAPS
+#endif /* __SYSTEM_TARGET_H__ */

firmware/target/hosted/fiio/usb-fiio.c

@@ -0,0 +1,81 @@
+/***************************************************************************
+ *             __________               __   ___
+ *   Open      \______   \ ____   ____ |  | _\_ |__   _______  ___
+ *   Source     |       _//  _ \_/ ___\|  |/ /| __ \ /  _ \  \/  /
+ *   Jukebox    |    |   (  <_> )  \___|    < | \_\ (  <_> > <  <
+ *   Firmware   |____|_  /\____/ \___  >__|_ \|___  /\____/__/\_ \
+ *                     \/            \/     \/    \/            \/
+ *
+ * Copyright (C) 2018 by Marcin Bukat
+ *
+ * This program is free software; you can redistribute it and/or
+ * modify it under the terms of the GNU General Public License
+ * as published by the Free Software Foundation; either version 2
+ * of the License, or (at your option) any later version.
+ *
+ * This software is distributed on an "AS IS" basis, WITHOUT WARRANTY OF ANY
+ * KIND, either express or implied.
+ *
+ ****************************************************************************/
+
+#include <stdlib.h>
+#include <sys/mount.h>
+#include <string.h>
+#include "config.h"
+#include "disk.h"
+#include "usb.h"
+#include "sysfs.h"
+#include "power.h"
+#include "power-fiio.h"
+
+const char * const sysfs_usb_online =
+    "/sys/class/power_supply/usb/online";
+
+int usb_detect(void)
+{
+    int present = 0;
+    sysfs_get_int(sysfs_usb_online, &present);
+
+    return present ? USB_INSERTED : USB_EXTRACTED;
+}
+
+void usb_enable(bool on)
+{
+    if (on)
+    {
+	system ("insmod /lib/modules/3.10.14/kernel/driver/usb/gadget/libcomposite.ko");
+	system ("insmod /lib/modules/3.10.14/kernel/driver/usb/gadget/usb_f_mass_storage.ko");
+	system ("insmod /lib/modules/3.10.14/kernel/driver/usb/gadget/g_mass_storage.ko file=/dev/mmcblk0 removable=1");
+    }
+    else
+    {
+	system ("rmmod g_mass_storage");
+	system ("rmmod usb_f_mass_storage");
+	system ("rmmod libcomposite");
+    }
+}
+
+/* This is called by usb thread after usb extract in order to return
+ * regular FS access
+ *
+ * returns the # of successful mounts
+*/
+int disk_mount_all(void)
+{
+    return 1;
+}
+
+/* This is called by usb thread after all threads ACKs usb inserted message
+ *
+ * returns the # of successful unmounts
+ */
+int disk_unmount_all(void)
+{
+    return 1;
+}
+
+void usb_init_device(void)
+{
+    system ("insmod /lib/modules/3.10.14/kernel/driver/staging/dwc2/dwc2.ko");
+    usb_enable(true);
+}

firmware/target/hosted/filesystem-app.c

@@ -36,9 +36,14 @@
 #include "rbpaths.h"
 #include "logf.h"
 
-#if (defined(AGPTEK_ROCKER) || defined(XDUOO_X3II) || defined(XDUOO_X20)) && !(defined(BOOTLOADER) || defined(CHECKWPS) || defined(SIMULATOR))
-#define PIVOT_ROOT HOME_DIR
+#if !(defined(BOOTLOADER) || defined(CHECKWPS) || defined(SIMULATOR))
+#if (defined(AGPTEK_ROCKER) || defined(XDUOO_X3II) || defined(XDUOO_X20))
+#define PIVOT_ROOT "/mnt/sd_0"
+#elif defined(FIIO_M3K)
+#define PIVOT_ROOT "/mnt"  // XXX check this!
+#else
 #endif
+#endif // !(BOOTLOADER|WPS|SIM)
 
 #if (CONFIG_PLATFORM & PLATFORM_ANDROID)
 static const char rbhome[] = "/sdcard";
@@ -52,7 +57,7 @@ static const char rbhome[] = HOME_DIR;
 
 #if !(defined(SAMSUNG_YPR0) || defined(SAMSUNG_YPR1) || defined(DX50) || \
      defined(SONY_NWZ_LINUX) || defined(DX90) || defined(AGPTEK_ROCKER) || \
-     defined(XDUOO_X3II) || defined(XDUOO_X20)) &&	\
+     defined(XDUOO_X3II) || defined(XDUOO_X20) || defined(FIIO_M3K) || defined(FIIO_M3K_PRO)) &&	\
     !defined(__PCTOOL__)
 /* Special dirs are user-accessible (and user-writable) dirs which take priority
  * over the ones where Rockbox is installed to. Classic example would be