imx233: introduce generic audio routing driver

Change-Id: Icd439e02dd9835778d2733fc01a9306552b36966

2 files changed, 178 insertions, 0 deletions

diff --git a/firmware/target/arm/imx233/audio-imx233.c b/firmware/target/arm/imx233/audio-imx233.c
new file mode 100644
index 0000000..54b1784
--- /dev/null
+++ b/firmware/target/arm/imx233/audio-imx233.c
@@ -0,0 +1,130 @@
+/***************************************************************************
+ *             __________               __   ___.
+ *   Open      \______   \ ____   ____ |  | _\_ |__   _______  ___
+ *   Source     |       _//  _ \_/ ___\|  |/ /| __ \ /  _ \  \/  /
+ *   Jukebox    |    |   (  <_> )  \___|    < | \_\ (  <_> > <  <
+ *   Firmware   |____|_  /\____/ \___  >__|_ \|___  /\____/__/\_ \
+ *                     \/            \/     \/    \/            \/
+ * $Id$
+ *
+ * Copyright (C) 2013 by 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 "audiohw.h"
+#include "audio-imx233.h"
+#include "pinctrl-imx233.h"
+
+void __attribute__((weak)) imx233_audio_preinit(void)
+{
+#ifdef IMX233_AUDIO_HP_GATE_BANK
+    imx233_pinctrl_acquire(IMX233_AUDIO_HP_GATE_BANK, IMX233_AUDIO_HP_GATE_PIN, "hp_gate");
+    imx233_pinctrl_set_function(IMX233_AUDIO_HP_GATE_BANK, IMX233_AUDIO_HP_GATE_PIN, PINCTRL_FUNCTION_GPIO);
+    imx233_pinctrl_enable_gpio(IMX233_AUDIO_HP_GATE_BANK, IMX233_AUDIO_HP_GATE_PIN, true);
+    imx233_audio_enable_hp(false);
+#endif
+#ifdef IMX233_AUDIO_SPKR_GATE_BANK
+    imx233_pinctrl_acquire(IMX233_AUDIO_SPKR_GATE_BANK, IMX233_AUDIO_SPKR_GATE_PIN, "spkr_gate");
+    imx233_pinctrl_set_function(IMX233_AUDIO_SPKR_GATE_BANK, IMX233_AUDIO_SPKR_GATE_PIN, PINCTRL_FUNCTION_GPIO);
+    imx233_pinctrl_enable_gpio(IMX233_AUDIO_SPKR_GATE_BANK, IMX233_AUDIO_SPKR_GATE_PIN, true);
+    imx233_audio_enable_spkr(false);
+#endif
+}
+
+void __attribute__((weak)) imx233_audio_postinit(void)
+{
+    imx233_audio_enable_hp(true);
+}
+// enable/disable the HP audio gate (typically using a GPIO)
+void __attribute__((weak)) imx233_audio_enable_hp(bool en)
+{
+#ifdef IMX233_AUDIO_HP_GATE_BANK
+# ifdef IMX233_AUDIO_HP_GATE_INVERTED
+    en = !en;
+# endif
+    imx233_pinctrl_set_gpio(IMX233_AUDIO_HP_GATE_BANK, IMX233_AUDIO_HP_GATE_PIN, en);
+#else
+    (void) en;
+#endif
+}
+// enable/disable the speaker audio gate (typically using a GPIO)
+void __attribute__((weak)) imx233_audio_enable_spkr(bool en)
+{
+#ifdef IMX233_AUDIO_SPKR_GATE_BANK
+# ifdef IMX233_AUDIO_SPKR_GATE_INVERTED
+    en = !en;
+# endif
+    imx233_pinctrl_set_gpio(IMX233_AUDIO_SPKR_GATE_BANK, IMX233_AUDIO_SPKR_GATE_PIN, en);
+#else
+    (void) en;
+#endif
+}
+
+static int input_source = AUDIO_SRC_PLAYBACK;
+static unsigned input_flags = 0;
+static int output_source = AUDIO_SRC_PLAYBACK;
+
+static void select_audio_path(void)
+{
+#if defined(HAVE_RECORDING)
+    const bool recording = input_flags & SRCF_RECORDING;
+#else
+    const bool recording = false;
+#endif
+
+    switch(input_source)
+    {
+        default:
+            /* playback and no recording */
+            input_source = AUDIO_SRC_PLAYBACK;
+            /* fallthrough */
+        case AUDIO_SRC_PLAYBACK:
+            audiohw_set_monitor(false);
+            audiohw_disable_recording();
+            break;
+
+#if defined(HAVE_RECORDING) && (INPUT_SRC_CAPS & SRC_CAP_MIC)
+        /* recording only */
+        case AUDIO_SRC_MIC:
+            audiohw_set_monitor(false);
+            audiohw_enable_recording(true);
+            break;
+#endif
+
+#if (INPUT_SRC_CAPS & SRC_CAP_FMRADIO)
+        /* recording and playback */
+        case AUDIO_SRC_FMRADIO:
+            if (recording)
+            {
+                audiohw_set_monitor(false);
+                audiohw_enable_recording(false);
+            }
+            else
+            {
+                audiohw_disable_recording();
+                audiohw_set_monitor(true); /* line 2 analog audio path */
+            }
+            break;
+#endif /* (INPUT_SRC_CAPS & SRC_CAP_FMRADIO) */
+    }
+}
+
+void __attribute__((weak)) audio_input_mux(int source, unsigned flags)
+{
+    input_source = source;
+    input_flags = flags;
+    select_audio_path();
+}
+
+void __attribute__((weak)) audio_set_output_source(int source)
+{
+    output_source = source;
+    select_audio_path();
+}
diff --git a/firmware/target/arm/imx233/audio-imx233.h b/firmware/target/arm/imx233/audio-imx233.h
new file mode 100644
index 0000000..dd0cdeb
--- /dev/null
+++ b/firmware/target/arm/imx233/audio-imx233.h
@@ -0,0 +1,48 @@
+/***************************************************************************
+ *             __________               __   ___.
+ *   Open      \______   \ ____   ____ |  | _\_ |__   _______  ___
+ *   Source     |       _//  _ \_/ ___\|  |/ /| __ \ /  _ \  \/  /
+ *   Jukebox    |    |   (  <_> )  \___|    < | \_\ (  <_> > <  <
+ *   Firmware   |____|_  /\____/ \___  >__|_ \|___  /\____/__/\_ \
+ *                     \/            \/     \/    \/            \/
+ * $Id$
+ *
+ * Copyright (C) 2013 by 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 __audio_imx233__
+#define __audio_imx233__
+
+#include "audio.h"
+#include "audio-target.h"
+
+/* target can override those functions to provide hooks to the audio code
+ * alternativelly, the default implementation provide support for GPIO
+ * controlled gates using the following defines
+ * NOTE by default gates are enabled by setting GPIO to 1 (except if inverted)
+ *
+ * IMX233_AUDIO_HP_GATE_BANK (gpio bank)
+ * IMX233_AUDIO_HP_GATE_PIN (gpio pin)
+ * IMX233_AUDIO_HP_GATE_INVERTED (define if inverted)
+ *
+ * IMX233_AUDIO_SPKR_GATE_BANK (gpio bank)
+ * IMX233_AUDIO_SPKR_GATE_PIN (gpio pin)
+ * IMX233_AUDIO_SPKR_GATE_INVERTED (define if inverted)
+ */
+// do some initialisation related to next functions
+void imx233_audio_preinit(void);
+void imx233_audio_postinit(void);
+// enable/disable the HP audio gate (typically using a GPIO)
+void imx233_audio_enable_hp(bool en);
+// enable/disable the speaker audio gate (typically using a GPIO)
+void imx233_audio_enable_spkr(bool en);
+
+#endif /* __audio_imx233__ */
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