nwzlinux: add support for radio

None of the Sony up to A15 seem to support RDS (they use either Si4702 or Si4708),
thus I did not add any code to support RDS.

Change-Id: I64838993b9705b36b94665f8470c7a89c772c961

firmware/target/hosted/sonynwz/radio-nwz.c

@@ -0,0 +1,110 @@
+/***************************************************************************
+ *             __________               __   ___.
+ *   Open      \______   \ ____   ____ |  | _\_ |__   _______  ___
+ *   Source     |       _//  _ \_/ ___\|  |/ /| __ \ /  _ \  \/  /
+ *   Jukebox    |    |   (  <_> )  \___|    < | \_\ (  <_> > <  <
+ *   Firmware   |____|_  /\____/ \___  >__|_ \|___  /\____/__/\_ \
+ *                     \/            \/     \/    \/            \/
+ *
+ * Copyright (C) 2017 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 <unistd.h>
+#include <fcntl.h>
+#include <sys/ioctl.h>
+#include <sys/stat.h>
+#include "stdint.h"
+#include "stdio.h"
+#include "string.h"
+#include "kernel.h"
+#include "rbendian.h"
+
+#include "nwz_tuner.h"
+#include "si4700.h"
+#include "power.h"
+
+static int radio_fd = -1;
+
+bool tuner_power(bool status)
+{
+    if(status != tuner_powered())
+    {
+        if(status)
+        {
+            radio_fd = open(NWZ_TUNER_DEV, 0);
+            if(radio_fd != -1)
+            {
+                /* Sony is braindead, opening the radio device mutes all audio (even from the DAC)
+                 * until SET_FREQ is called with a valid frequency, choose 90MHz because it is valid
+                 * in all bands */
+                struct nwz_tuner_ioctl_t req;
+                memset(&req, 0, sizeof(req)); // just to avoid garbage in
+                req.freq = 90000;
+                int ret = ioctl(radio_fd, NWZ_TUNER_SET_FREQ, &req);
+                if(ret != 0)
+                    perror("tuner set_freq error");
+            }
+            else
+                perror("tuner open error");
+        }
+        else
+        {
+            close(radio_fd);
+            radio_fd = -1;
+        }
+    }
+    return tuner_powered();
+}
+
+bool tuner_powered(void)
+{
+    return radio_fd != -1;
+}
+
+/* one can adjust the following depending on the tuner, for now it is calibrated for the si470x
+ * which is crazy, because it starts reading at register 0xA and writing at 0x2. We need to
+ * "emulate" this behavior... Note that Si470x transmits in big-endian */
+#define READ_START_REG  0xA
+#define WRITE_START_REG 0x2
+#define REG_COUNT       16
+#define REG_SIZE        2
+#define REG_TYPE        uint16_t
+#define REG_SWAP        swap16
+
+int fmradio_i2c_write(unsigned char address, unsigned char* buf, int count)
+{
+    (void)address;
+    struct nwz_tuner_ioctl_t req;
+    memset(&req, 0, sizeof(req)); // just to avoid garbage in
+    for(int i = 0; i < count / REG_SIZE; i++)
+    {
+        req.put.regno = (WRITE_START_REG + i) % REG_COUNT;
+        req.put.val = REG_SWAP(*(REG_TYPE *)&buf[i * REG_SIZE]);
+        int ret = ioctl(radio_fd, NWZ_TUNER_PUT_REG, &req);
+        if(ret != 0)
+            return ret;
+    }
+    return 0;
+}
+
+int fmradio_i2c_read(unsigned char address, unsigned char* buf, int count)
+{
+    (void)address;
+    struct nwz_tuner_ioctl_t req;
+    memset(&req, 0, sizeof(req)); // just to avoid garbage in
+    int ret = ioctl(radio_fd, NWZ_TUNER_GET_REG_ALL, &req);
+    if(ret != 0)
+        return ret;
+    for(int i = 0; i < count / REG_SIZE; i++)
+        *(REG_TYPE *)&buf[i * REG_SIZE] = REG_SWAP(req.regs[(READ_START_REG + i) % REG_COUNT]);
+    return 0;
+}