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/***************************************************************************
* __________ __ ___.
* 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)
{
perror("tuner put_reg error");
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)
{
perror("radio get_reg_all error");
return ret;
}
for(int i = 0; i < count / REG_SIZE; i++)
{
/* on version 1, some registers are not reported by Sony's driver */
int sony_reg = (READ_START_REG + i) % REG_COUNT;
if(sony_reg < NWZ_TUNER_REG_COUNT)
*(REG_TYPE *)&buf[i * REG_SIZE] = REG_SWAP(req.regs[sony_reg]);
else
*(REG_TYPE *)&buf[i * REG_SIZE] = 0xfeca; /* recognizable pattern for debug menu */
}
return 0;
}
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