Radio and radio recording for Samsung YH-920.

There is no simple method to detect radio through the 3-wire interface, so it's
not implemented for the YH-925 for now. YH-920 always has a radio.

Change-Id: Iea484d752915fcd40dbbbd7dbbf13e81aaf548db

firmware/target/arm/pp/audio-pp.c

@@ -30,6 +30,25 @@ void audio_set_output_source(int source)
         source = AUDIO_SRC_PLAYBACK;
 } /* audio_set_output_source */
 
+#ifdef HAVE_AK4537
+void audio_input_mux(int source, unsigned flags)
+{
+    (void)flags;
+    /* Prevent pops from unneeded switching */
+    static int last_source = AUDIO_SRC_PLAYBACK;
+
+#ifdef HAVE_FMRADIO_REC
+    bool recording = flags & SRCF_RECORDING;
+
+    if ((source == AUDIO_SRC_FMRADIO) && (!recording))
+        audiohw_set_recvol(0, 0, AUDIO_GAIN_LINEIN); /* Set line-in vol to 0dB*/
+#endif
+    if (source != last_source)
+        audiohw_set_recsrc(source);
+
+    last_source = source;
+}
+#else
 void audio_input_mux(int source, unsigned flags)
 {
     (void)flags;
@@ -132,4 +151,6 @@ void audio_input_mux(int source, unsigned flags)
 
     last_source = source;
 } /* audio_input_mux */
+#endif
+
 #endif /* INPUT_SRC_CAPS != 0 */

firmware/target/arm/samsung/fmradio-yh92x.c

@@ -0,0 +1,120 @@
+/***************************************************************************
+ *             __________               __   ___.
+ *   Open      \______   \ ____   ____ |  | _\_ |__   _______  ___
+ *   Source     |       _//  _ \_/ ___\|  |/ /| __ \ /  _ \  \/  /
+ *   Jukebox    |    |   (  <_> )  \___|    < | \_\ (  <_> > <  <
+ *   Firmware   |____|_  /\____/ \___  >__|_ \|___  /\____/__/\_ \
+ *                     \/            \/     \/    \/            \/
+ * $Id$
+ * Physical interface of the Philips TEA5767 in Samsung YH-92x
+ *
+ * Copyright (C) 2014 by Szymon Dziok
+ *
+ * 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 "config.h"
+#include "system.h"
+#include "cpu.h"
+#include "fmradio_3wire.h"
+
+#define CLOCK_EN      GPIO_SET_BITWISE(GPIOL_ENABLE, 0x10)
+#define CLOCK_OUT     GPIO_SET_BITWISE(GPIOL_OUTPUT_EN, 0x10)
+#define CLOCK_LO      GPIO_CLEAR_BITWISE(GPIOL_OUTPUT_VAL, 0x10)
+#define CLOCK_HI      GPIO_SET_BITWISE(GPIOL_OUTPUT_VAL, 0x10)
+
+#define DATA          (GPIOL_INPUT_VAL & 0x08)
+#define DATA_EN       GPIO_SET_BITWISE(GPIOL_ENABLE, 0x08)
+#define DATA_IN       GPIO_CLEAR_BITWISE(GPIOL_OUTPUT_EN, 0x08)
+#define DATA_OUT      GPIO_SET_BITWISE(GPIOL_OUTPUT_EN, 0x08)
+#define DATA_LO       GPIO_CLEAR_BITWISE(GPIOL_OUTPUT_VAL, 0x08)
+#define DATA_HI       GPIO_SET_BITWISE(GPIOL_OUTPUT_VAL, 0x08)
+
+#define READWRITE_EN  GPIO_SET_BITWISE(GPIOL_ENABLE, 0x01)
+#define READWRITE_OUT GPIO_SET_BITWISE(GPIOL_OUTPUT_EN, 0x01)
+#define READWRITE_LO  GPIO_CLEAR_BITWISE(GPIOL_OUTPUT_VAL, 0x01)
+#define READWRITE_HI  GPIO_SET_BITWISE(GPIOL_OUTPUT_VAL, 0x01)
+
+#define DELAY1   udelay(1)
+#define DELAY2   udelay(2)
+
+void fmradio_3wire_init(void)
+{
+    READWRITE_EN;
+    READWRITE_OUT;
+
+    DATA_EN;
+    DATA_IN;
+
+    CLOCK_EN;
+    CLOCK_HI;
+    CLOCK_OUT;
+
+    DELAY2;
+}
+
+int fmradio_3wire_write(const unsigned char* buf)
+{
+    int i, j;
+
+    CLOCK_LO;
+    READWRITE_LO;
+    DELAY2;
+    READWRITE_HI;
+    DELAY1;
+    DATA_OUT;
+
+    /* 5 bytes to the tuner */
+    for (j = 0; j < 5; j++)
+    {
+        for (i = 7; i >= 0; i--)
+        {
+            if ((buf[j] >> i) & 0x1) DATA_HI;
+                else DATA_LO;
+            DELAY1;
+            CLOCK_HI;
+            DELAY2;
+            CLOCK_LO;
+            DELAY1;
+        }
+    }
+    READWRITE_LO;
+
+    return j;
+}
+
+int fmradio_3wire_read(unsigned char* buf)
+{
+    int i, j;
+
+    CLOCK_LO;
+    READWRITE_HI;
+    DELAY2;
+    READWRITE_LO;
+    DELAY2;
+    DATA_IN;
+
+    /* 5 bytes from the tuner */
+    for (j = 0; j < 5; j++)
+    {
+        buf[j] = 0;
+        for (i = 7; i >= 0; i--)
+        {
+            buf[j] |= ((DATA >> 3) << i);
+
+            CLOCK_HI;
+            DELAY2;
+            CLOCK_LO;
+            DELAY2;
+        }
+    }
+    READWRITE_HI;
+
+    return j;
+}

firmware/target/arm/samsung/power-yh82x_yh92x.c

@@ -20,7 +20,7 @@
  ****************************************************************************/
 
 /* Created from power.c using some iPod code, and some custom stuff based on 
-   GPIO analysis 
+   GPIO analysis
 */
 
 #include "config.h"
@@ -32,9 +32,26 @@
 #include "power.h"
 #include "logf.h"
 #include "usb.h"
+#include "fmradio_3wire.h"
+
+#if CONFIG_TUNER
+bool tuner_power(bool status)
+{
+    GPIO_SET_BITWISE(GPIOL_ENABLE, 0x04);
+    GPIO_SET_BITWISE(GPIOL_OUTPUT_EN, 0x04);
+    if (status)
+        GPIO_CLEAR_BITWISE(GPIOL_OUTPUT_VAL, 0x04);
+    else
+        GPIO_SET_BITWISE(GPIOL_OUTPUT_VAL, 0x04);
+    return status;
+}
+#endif
 
 void power_init(void)
 {
+#if CONFIG_TUNER
+    fmradio_3wire_init();
+#endif
 }
 
 unsigned int power_input_status(void)