xduoo_x3ii: Improvements in the meymappings!

 * PREV/NEXT now swapped so they do what is expected in most contexts
 * List and setting context retains prior behavior
 * Enable the ADC that reads the headset remote and map the keys.
 * As ADC-based remote "events" arrive as press/release pairs,
   delay the button release.

Change-Id: I22d4eac3bfe1573b50eca795cf377bdafdeb5336

4 files changed, 52 insertions, 14 deletions

diff --git a/firmware/drivers/audio/xduoolinux_codec.c b/firmware/drivers/audio/xduoolinux_codec.c
index 3ce35aa62a..c78864db2c 100644
--- a/firmware/drivers/audio/xduoolinux_codec.c
+++ b/firmware/drivers/audio/xduoolinux_codec.c
@@ -141,7 +141,7 @@ int xduoo_get_outputs(void){
 
 #if defined(XDUOO_X20)
     sysfs_get_int(sysfs_bal_switch, &status);
-    if (status) ps = 3; // balance
+    if (status) ps = 3; // balanced output
 #endif
 
     xduoo_set_output(ps);
@@ -159,7 +159,12 @@ void xduoo_set_output(int 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);
+        audiohw_set_volume(vol_l_hw, vol_r_hw);
+
+#if defined(XDUOO_X3II)
+        /* Enable/disable headphone remote ADC */
+        sysfs_set_string("/sys/devices/platform/earpods_adc.0/earpods_adc/earpods_adc_sw", (ps == 2) ? "on" : "off");
+#endif
     }
 }
 
diff --git a/firmware/target/hosted/button-devinput.c b/firmware/target/hosted/button-devinput.c
index 90e6fb0340..b1b4dfca5d 100644
--- a/firmware/target/hosted/button-devinput.c
+++ b/firmware/target/hosted/button-devinput.c
@@ -19,7 +19,6 @@
  * KIND, either express or implied.
  *
  ****************************************************************************/
-
 #include <poll.h>
 #include <errno.h>
 #include <unistd.h>
@@ -72,6 +71,11 @@ void button_close_device(void)
     num_devices = 0;
 }
 
+#ifdef BUTTON_DELAY_RELEASE
+static int button_delay_release = 0;
+static int delay_tick = 0;
+#endif
+
 int button_read_device(void)
 {
     static int button_bitmap = 0;
@@ -81,6 +85,15 @@ int button_read_device(void)
     int wheel_ticks = 0;
 #endif
 
+#ifdef BUTTON_DELAY_RELEASE
+    /* First de-assert delayed-release buttons */
+    if (button_delay_release && current_tick >= delay_tick)
+    {
+        button_bitmap &= ~button_delay_release;
+        button_delay_release = 0;
+    }
+#endif
+
     /* check if there are any events pending and process them */
     while(poll(poll_fds, num_devices, 0))
     {
@@ -92,17 +105,14 @@ int button_read_device(void)
                 int size = read(poll_fds[i].fd, &event, sizeof(event));
                 if(size == (int)sizeof(event))
                 {
-                    int keycode = event.code;
+                    /* map linux event code to rockbox button bitmap */
+                    int bmap = button_map(event.code);
+
                     /* event.value == 0x10000 means press
                      * event.value == 0 means release
                      */
-                    bool press = event.value ? true : false;
-
-                    /* map linux event code to rockbox button bitmap */
-                    if(press)
+                    if(event.value)
                     {
-                        int bmap = button_map(keycode);
-
 #ifdef HAVE_SCROLLWHEEL
 			/* Filter out wheel ticks */
                         if (bmap & BUTTON_SCROLL_BACK)
@@ -111,18 +121,28 @@ int button_read_device(void)
                             wheel_ticks++;
                         bmap &= ~(BUTTON_SCROLL_BACK|BUTTON_SCROLL_FWD);
 #endif
+#ifdef BUTTON_DELAY_RELEASE
+                        bmap &= ~BUTTON_DELAY_RELEASE;
+#endif
                         button_bitmap |= bmap;
                     }
                     else
                     {
-                        int bmap = button_map(keycode);
+#ifdef BUTTON_DELAY_RELEASE
+                        /* Delay the release of any requested buttons */
+                        if (bmap & BUTTON_DELAY_RELEASE)
+                        {
+                            button_delay_release |= bmap & ~BUTTON_DELAY_RELEASE;
+                            delay_tick = current_tick + HZ/20;
+                            bmap = 0;
+                        }
+#endif
 
 #ifdef HAVE_SCROLLWHEEL
                         /* Wheel gives us press+release back to back; ignore the release */
                         bmap &= ~(BUTTON_SCROLL_BACK|BUTTON_SCROLL_FWD);
 #endif
                         button_bitmap &= ~bmap;
-
                     }
                 }
             }
diff --git a/firmware/target/hosted/xduoo/button-target.h b/firmware/target/hosted/xduoo/button-target.h
index 20bae1c6f6..d1a2b27624 100644
--- a/firmware/target/hosted/xduoo/button-target.h
+++ b/firmware/target/hosted/xduoo/button-target.h
@@ -36,6 +36,8 @@
 #define BUTTON_MAIN  (BUTTON_POWER | BUTTON_HOME | BUTTON_OPTION | BUTTON_PREV | \
                       BUTTON_NEXT | BUTTON_PLAY | BUTTON_VOL_UP | BUTTON_VOL_DOWN)
 
+#define BUTTON_DELAY_RELEASE 0x00010000
+
 /* Software power-off */
 #define POWEROFF_BUTTON BUTTON_POWER
 #define POWEROFF_COUNT  25
diff --git a/firmware/target/hosted/xduoo/button-xduoo.c b/firmware/target/hosted/xduoo/button-xduoo.c
index f5b6c6be62..2daa7da16b 100644
--- a/firmware/target/hosted/xduoo/button-xduoo.c
+++ b/firmware/target/hosted/xduoo/button-xduoo.c
@@ -37,10 +37,10 @@ int button_map(int keycode)
             return BUTTON_OPTION;
 
         case KEY_UP:
-            return BUTTON_PREV;
+            return BUTTON_NEXT;
 
         case KEY_DOWN:
-            return BUTTON_NEXT;
+            return BUTTON_PREV;
 
         case KEY_ENTER:
             return BUTTON_PLAY;
@@ -54,6 +54,17 @@ int button_map(int keycode)
         case KEY_POWER:
             return BUTTON_POWER;
 
+#if defined(XDUOO_X3II) /* Headphone remote */
+        case KEY_NEXTSONG:
+            return (BUTTON_NEXT | BUTTON_DELAY_RELEASE);
+
+        case KEY_PLAYPAUSE:
+            return (BUTTON_PLAY | BUTTON_DELAY_RELEASE);
+
+        case KEY_PREVIOUSSONG:
+            return (BUTTON_PREV | BUTTON_DELAY_RELEASE);
+
+#endif
         default:
             return 0;
     }