Add HAVE_LINEOUT_DETECTION and associated logic

This allows targets to automatically switch audio settings when the
line out is plugged/unplugged.

Only hooked up on the xDuoo X3, but there are other potential users.

Change-Id: Ic46a329bc955cca2e2ad0335ca16295eab24ad59

apps/misc.c

@@ -521,7 +521,7 @@ void car_adapter_mode_init(void)
 #endif
 
 #ifdef HAVE_HEADPHONE_DETECTION
-static void unplug_change(bool inserted)
+static void hp_unplug_change(bool inserted)
 {
     static bool headphone_caused_pause = false;
 
@@ -553,6 +553,18 @@ static void unplug_change(bool inserted)
 }
 #endif
 
+#ifdef HAVE_LINEOUT_DETECTION
+static void lo_unplug_change(bool inserted)
+{
+#ifdef HAVE_LINEOUT_POWEROFF
+    lineout_set(inserted);
+#else
+    (void)inserted;
+    audiohw_set_lineout_volume(0,0);
+#endif
+}
+#endif
+
 long default_event_handler_ex(long event, void (*callback)(void *), void *parameter)
 {
 #if CONFIG_PLATFORM & (PLATFORM_ANDROID|PLATFORM_MAEMO)
@@ -632,13 +644,22 @@ long default_event_handler_ex(long event, void (*callback)(void *), void *parame
 #endif
 #ifdef HAVE_HEADPHONE_DETECTION
         case SYS_PHONE_PLUGGED:
-            unplug_change(true);
+            hp_unplug_change(true);
             return SYS_PHONE_PLUGGED;
 
         case SYS_PHONE_UNPLUGGED:
-            unplug_change(false);
+            hp_unplug_change(false);
             return SYS_PHONE_UNPLUGGED;
 #endif
+#ifdef HAVE_LINEOUT_DETECTION
+        case SYS_LINEOUT_PLUGGED:
+            lo_unplug_change(true);
+            return SYS_LINEOUT_PLUGGED;
+
+        case SYS_LINEOUT_UNPLUGGED:
+            lo_unplug_change(false);
+            return SYS_LINEOUT_UNPLUGGED;
+#endif
 #if CONFIG_PLATFORM & (PLATFORM_ANDROID|PLATFORM_MAEMO)
         /* stop playback if we receive a call */
         case SYS_CALL_INCOMING:

firmware/drivers/button.c

@@ -59,6 +59,9 @@ static bool remote_filter_first_keypress;
 #ifdef HAVE_HEADPHONE_DETECTION
 static bool phones_present = false;
 #endif
+#ifdef HAVE_LINEOUT_DETECTION
+static bool lineout_present = false;
+#endif
 
 /* how long until repeat kicks in, in centiseconds */
 #define REPEAT_START      (30*HZ/100)
@@ -97,9 +100,8 @@ static int last_touchscreen_touch;
 #endif
 #if defined(HAVE_HEADPHONE_DETECTION)
 static struct timeout hp_detect_timeout; /* Debouncer for headphone plug/unplug */
-/* This callback can be used for many different functions if needed -
-   just check to which object tmo points */
-static int btn_detect_callback(struct timeout *tmo)
+
+static int hp_detect_callback(struct timeout *tmo)
 {
     /* Try to post only transistions */
     const long id = tmo->data ? SYS_PHONE_PLUGGED : SYS_PHONE_UNPLUGGED;
@@ -109,6 +111,19 @@ static int btn_detect_callback(struct timeout *tmo)
 }
 #endif
 
+#if defined(HAVE_LINEOUT_DETECTION)
+static struct timeout lo_detect_timeout; /* Debouncer for lineout plug/unplug */
+
+static int lo_detect_callback(struct timeout *tmo)
+{
+    /* Try to post only transistions */
+    const long id = tmo->data ? SYS_LINEOUT_PLUGGED : SYS_LINEOUT_UNPLUGGED;
+    queue_remove_from_head(&button_queue, id);
+    queue_post(&button_queue, id, 0);
+    return 0;
+}
+#endif
+
 static bool button_try_post(int button, int data)
 {
 #ifdef HAVE_TOUCHSCREEN
@@ -176,10 +191,19 @@ static void button_tick(void)
     {
         /* Use the autoresetting oneshot to debounce the detection signal */
         phones_present = !phones_present;
-        timeout_register(&hp_detect_timeout, btn_detect_callback,
+        timeout_register(&hp_detect_timeout, hp_detect_callback,
                          HZ/2, phones_present);
     }
 #endif
+#if defined(HAVE_LINEOUT_DETECTION)
+    if (lineout_inserted() != lineout_present)
+    {
+        /* Use the autoresetting oneshot to debounce the detection signal */
+        lineout_present = !lineout_present;
+        timeout_register(&lo_detect_timeout, lo_detect_callback,
+                         HZ/2, lineout_present);
+    }
+#endif
 
     /* Find out if a key has been released */
     diff = btn ^ lastbtn;

firmware/export/button.h

@@ -72,6 +72,9 @@ void set_remote_backlight_filter_keypress(bool value);
 #ifdef HAVE_HEADPHONE_DETECTION
 bool headphones_inserted(void);
 #endif
+#ifdef HAVE_LINEOUT_DETECTION
+bool lineout_inserted(void);
+#endif
 #ifdef HAVE_WHEEL_POSITION
 int wheel_status(void);
 void wheel_send_events(bool send);

firmware/export/config/xduoox3.h

@@ -73,6 +73,9 @@
 /* Define this if you can detect headphones */
 #define HAVE_HEADPHONE_DETECTION
 
+/* Define this if you can detect lineout */
+#define HAVE_LINEOUT_DETECTION
+
 #define CONFIG_KEYPAD XDUOO_X3_PAD
 
 /* Define this if a programmable hotkey is mapped */

firmware/kernel/include/queue.h

@@ -65,6 +65,8 @@
 #define SYS_PHONE_UNPLUGGED       MAKE_SYS_EVENT(SYS_EVENT_CLS_PLUG, 3)
 #define SYS_REMOTE_PLUGGED        MAKE_SYS_EVENT(SYS_EVENT_CLS_PLUG, 4)
 #define SYS_REMOTE_UNPLUGGED      MAKE_SYS_EVENT(SYS_EVENT_CLS_PLUG, 5)
+#define SYS_LINEOUT_PLUGGED       MAKE_SYS_EVENT(SYS_EVENT_CLS_PLUG, 6)
+#define SYS_LINEOUT_UNPLUGGED     MAKE_SYS_EVENT(SYS_EVENT_CLS_PLUG, 7)
 #define SYS_CAR_ADAPTER_RESUME    MAKE_SYS_EVENT(SYS_EVENT_CLS_MISC, 0)
 #define SYS_CALL_INCOMING         MAKE_SYS_EVENT(SYS_EVENT_CLS_MISC, 3)
 #define SYS_CALL_HUNG_UP          MAKE_SYS_EVENT(SYS_EVENT_CLS_MISC, 4)

firmware/target/mips/ingenic_jz47xx/codec-jz4760.c

@@ -26,6 +26,7 @@
 #include "pcm_sw_volume.h"
 #include "cs4398.h"
 #include "kernel.h"
+#include "button.h"
 
 #define PIN_CS_RST      (32*1+10)
 #define PIN_CODEC_PWRON (32*1+13)
@@ -140,7 +141,11 @@ static int vol_tenthdb2hw(const int tdb)
     }
 }
 
-void audiohw_set_volume(int vol_l, int vol_r)
+#ifdef HAVE_LINEOUT_DETECTION
+static int real_vol_l, real_vol_r;
+#endif
+
+static void jz4760_set_vol(int vol_l, int vol_r)
 {
     uint8_t val = cs4398_read_reg(CS4398_REG_MISC) &~ CS4398_FREEZE;
     cs4398_write_reg(CS4398_REG_MISC, val | CS4398_FREEZE);
@@ -149,14 +154,31 @@ void audiohw_set_volume(int vol_l, int vol_r)
     cs4398_write_reg(CS4398_REG_MISC, val);
 }
 
+void audiohw_set_volume(int vol_l, int vol_r)
+{
+#ifdef HAVE_LINEOUT_DETECTION
+    real_vol_l = vol_l;
+    real_vol_r = vol_r;
+
+    if (lineout_inserted()) {
+       vol_l = 0;
+       vol_r = 0;
+    }
+#endif
+    jz4760_set_vol(vol_l, vol_r);
+}
+
 void audiohw_set_lineout_volume(int vol_l, int vol_r)
 {
-#if 0 /* unused */
-    cs4398_write_reg(CS4398_REG_VOL_A, vol_tenthdb2hw(vol_l));
-    cs4398_write_reg(CS4398_REG_VOL_B, vol_tenthdb2hw(vol_r));
-#else
     (void)vol_l;
     (void)vol_r;
+
+#ifdef HAVE_LINEOUT_DETECTION
+    if (lineout_inserted()) {
+       jz4760_set_vol(0, 0);
+    } else {
+       jz4760_set_vol(real_vol_l, real_vol_r);
+    }
 #endif
 }
 

firmware/target/mips/ingenic_jz47xx/xduoo_x3/sadc-xduoo_x3.c

@@ -53,6 +53,13 @@ bool headphones_inserted(void)
     return (__gpio_get_pin(PIN_PH_DECT) != 0);
 }
 
+bool lineout_inserted(void)
+{
+    /* We want to prevent LO being "enabled" if HP is attached
+       to avoid potential eardrum damage */
+    return (__gpio_get_pin(PIN_LO_DECT) == 0) && !headphones_inserted();
+}
+
 void button_init_device(void)
 {
     key_val = 0xfff;
@@ -72,11 +79,11 @@ void button_init_device(void)
     __gpio_set_pin(PIN_CHARGE_CON); /* 0.7 A */
     __gpio_as_output(PIN_CHARGE_CON);
 
-    __gpio_as_input(PIN_LO_DECT);
     __gpio_as_input(PIN_PH_DECT);
-
-    __gpio_disable_pull(PIN_LO_DECT);
     __gpio_disable_pull(PIN_PH_DECT);
+
+    __gpio_as_input(PIN_LO_DECT);
+    __gpio_disable_pull(PIN_LO_DECT);
 }
 
 bool button_hold(void)