New port: AIGO EROS Q / EROS K

The Q and K have a slightly different case, but the hardware under the
shell is completely identical.

These models are rebadged versions:

 * Hifiwalker H2   (== Q)
 * AGPTek H3       (== K)
 * Surfans F20     (== K)

Other notes:

  * Significant improvements in the shared Hiby-platform launcher/loader
    * SD card can theoretically be hot-swapped now
    * Support external USB mass storage!
  * Some consolidation of Hiby-platform targets
  * Some consolidation of plugin keymaps

Todo/known issues:

 * Keymaps need to be gone over properly
 * Convert to HAVE_SCROLLWHEEL?

Change-Id: I5a8a4f22c38a5b69392ca7c0a8ad8c4e07d9523c

1 files changed, 181 insertions, 0 deletions

diff --git a/firmware/drivers/audio/erosqlinux_codec.c b/firmware/drivers/audio/erosqlinux_codec.c
new file mode 100644
index 0000000000..deb3bb4b87
--- /dev/null
+++ b/firmware/drivers/audio/erosqlinux_codec.c
@@ -0,0 +1,181 @@
+/***************************************************************************
+ *             __________               __   ___.
+ *   Open      \______   \ ____   ____ |  | _\_ |__   _______  ___
+ *   Source     |       _//  _ \_/ ___\|  |/ /| __ \ /  _ \  \/  /
+ *   Jukebox    |    |   (  <_> )  \___|    < | \_\ (  <_> > <  <
+ *   Firmware   |____|_  /\____/ \___  >__|_ \|___  /\____/__/\_ \
+ *                     \/            \/     \/    \/            \/
+ * $Id$
+ *
+ *
+ * Copyright (c) 2018 Marcin Bukat
+ * Copyright (c) 2020 Solomon Peachy
+ *
+ * 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.
+ *
+ ****************************************************************************/
+
+//#define LOGF_ENABLE
+
+#include "config.h"
+#include "audio.h"
+#include "audiohw.h"
+#include "button.h"
+#include "system.h"
+#include "kernel.h"
+#include "panic.h"
+#include "sysfs.h"
+#include "alsa-controls.h"
+#include "pcm-alsa.h"
+#include "pcm_sw_volume.h"
+
+#include "logf.h"
+
+static int fd_hw;
+static int inited = 0;
+
+static long int vol_l_hw = 255;
+static long int vol_r_hw = 255;
+static long int last_ps = 0;
+
+static void hw_open(void)
+{
+    fd_hw = open("/dev/snd/controlC0", O_RDWR);
+    if(fd_hw < 0)
+        panicf("Cannot open '/dev/snd/controlC0'");
+}
+
+static void hw_close(void)
+{
+    close(fd_hw);
+}
+
+void audiohw_mute(int mute)
+{
+    logf("mute %d", mute);
+
+    if(mute)
+    {
+        long int ps0 = 0;
+        alsa_controls_set_ints("Output Port Switch", 1, &ps0);
+    }
+    else
+    {
+        last_ps = 0;
+        erosq_get_outputs();
+    }
+}
+
+int erosq_get_outputs(void) {
+    long int ps = 0; // Muted, if nothing is plugged in!
+
+    int status = 0;
+
+    if (!inited) return ps;
+
+    const char * const sysfs_lo_switch = "/sys/class/switch/lineout/state";
+    const char * const sysfs_hs_switch = "/sys/class/switch/headset/state";
+
+    sysfs_get_int(sysfs_lo_switch, &status);
+    if (status) ps = 1; // lineout
+
+    sysfs_get_int(sysfs_hs_switch, &status);
+    if (status) ps = 2; // headset
+
+    erosq_set_output(ps);
+
+    return ps;
+}
+
+void erosq_set_output(int ps)
+{
+    if (!inited) return;
+
+    if (last_ps != ps)
+    {
+        logf("set out %d/%d", ps, last_ps);
+        /* Output port switch */
+        last_ps = ps;
+        alsa_controls_set_ints("Output Port Switch", 1, &last_ps);
+	audiohw_set_volume(vol_l_hw, vol_r_hw);
+    }
+}
+
+void audiohw_preinit(void)
+{
+    logf("hw preinit");
+    alsa_controls_init();
+    hw_open();
+    audiohw_mute(true);  /* Start muted to avoid the POP */
+    inited = 1;
+}
+
+void audiohw_postinit(void)
+{
+    logf("hw postinit");
+    erosq_set_output(erosq_get_outputs());  /* Unmute */
+}
+
+void audiohw_close(void)
+{
+    logf("hw close");
+    inited = 0;
+    hw_close();
+    alsa_controls_close();
+}
+
+void audiohw_set_frequency(int fsel)
+{
+    (void)fsel;
+}
+
+void audiohw_set_volume(int vol_l, int vol_r)
+{
+    logf("hw vol %d %d", vol_l, vol_r);
+
+    long l,r;
+
+    vol_l_hw = vol_l;
+    vol_r_hw = vol_r;
+
+    if (lineout_inserted()) {
+        l = 0;
+        r = 0;
+    } else {
+        l = vol_l_hw;
+        r = vol_r_hw;
+    }
+
+    /* SW volume for <= 1.0 gain, HW at unity, < -740 == MUTE */
+    int sw_volume_l = l <= -740 ? PCM_MUTE_LEVEL : MIN(l, 0);
+    int sw_volume_r = r <= -740 ? PCM_MUTE_LEVEL : MIN(r, 0);
+    pcm_set_master_volume(sw_volume_l, sw_volume_r);
+}
+
+void audiohw_set_lineout_volume(int vol_l, int vol_r)
+{
+    long l,r;
+
+    logf("lo vol %d %d", vol_l, vol_r);
+
+    (void)vol_l;
+    (void)vol_r;
+
+    if (lineout_inserted()) {
+        l = 0;
+        r = 0;
+    } else {
+        l = vol_l_hw;
+        r = vol_r_hw;
+    }
+
+    int sw_volume_l = l <= -740 ? PCM_MUTE_LEVEL : MIN(l, 0);
+    int sw_volume_r = r <= -740 ? PCM_MUTE_LEVEL : MIN(r, 0);
+    pcm_set_master_volume(sw_volume_l, sw_volume_r);
+}