Initial commit for the Sony NWZ linux port

SUPPORTED SERIES:
- NWZ-E450
- NWZ-E460
- NWZ-E470
- NWZ-E580
- NWZ-A10

NOTES:
- bootloader makefile convert an extra font to be installed alongside the bootloader
  since sysfont is way too small
- the toolsicon bitmap comes from the Oxygen iconset
- touchscreen driver is untested

TODO:
- implement audio routing driver (pcm is handled by pcm-alsa)
- fix playback: it crashes on illegal instruction in DEBUG builds
- find out why the browser starts at / instead of /contents
- implement radio support
- implement return to OF for usb handling
- calibrate battery curve (NB: of can report a battery level on a 0-5 scale but
  probabl don't want to use that ?)
- implement simulator build (we need a nice image of the player)
- figure out if we can detect jack removal

POTENTIAL TODOS:
- try to build a usb serial gadget and gdbserver

Change-Id: Ic77d71e0651355d47cc4e423a40fb64a60c69a80

firmware/target/hosted/sonynwz/nwz_keys.h

@@ -0,0 +1,63 @@
+/***************************************************************************
+ *             __________               __   ___.
+ *   Open      \______   \ ____   ____ |  | _\_ |__   _______  ___
+ *   Source     |       _//  _ \_/ ___\|  |/ /| __ \ /  _ \  \/  /
+ *   Jukebox    |    |   (  <_> )  \___|    < | \_\ (  <_> > <  <
+ *   Firmware   |____|_  /\____/ \___  >__|_ \|___  /\____/__/\_ \
+ *                     \/            \/     \/    \/            \/
+ * $Id$
+ *
+ * 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 __NWZ_KEYS_H__
+#define __NWZ_KEYS_H__
+
+/* The Sony icx_key driver reports keys via the /dev/input/event0 device and
+ * abuses the standard struct input_event. The input_event.code is split into
+ * two parts:
+ * - one part giving the code of the key just pressed/released
+ * - one part is a bitmap of various keys (such as HOLD)
+ * The status of the HOLD can be queried at any time by reading the state of
+ * the first LED.
+ */
+
+/* device name */
+#define NWZ_KEY_NAME    "icx_key"
+
+/* key code and mask */
+#define NWZ_KEY_MASK        0x1f
+#define NWZ_KEY_PLAY        0
+#define NWZ_KEY_RIGHT       1
+#define NWZ_KEY_LEFT        2
+#define NWZ_KEY_UP          3
+#define NWZ_KEY_DOWN        4
+#define NWZ_KEY_ZAPPIN      5
+#define NWZ_KEY_AD0_6       6
+#define NWZ_KEY_AD0_7       7
+/* special "key" when event is for bitmap key, like HOLD */
+#define NWZ_KEY_NONE        15
+#define NWZ_KEY_VOL_DOWN    16
+#define NWZ_KEY_VOL_UP      17
+#define NWZ_KEY_BACK        18
+#define NWZ_KEY_OPTION      19
+#define NWZ_KEY_BT          20
+#define NWZ_KEY_AD1_5       21
+#define NWZ_KEY_AD1_6       22
+#define NWZ_KEY_AD1_7       23
+
+/* bitmap of other things */
+#define NWZ_KEY_NMLHP_MASK  0x20
+#define NWZ_KEY_NCHP_MASK   0x40
+#define NWZ_KEY_HOLD_MASK   0x80
+#define NWZ_KEY_NC_MASK     0x100
+
+#endif /* __NWZ_KEYS_H__ */