123 lines
3.9 KiB
C
123 lines
3.9 KiB
C
/***************************************************************************
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* __________ __ ___.
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* Open \______ \ ____ ____ | | _\_ |__ _______ ___
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* Source | _// _ \_/ ___\| |/ /| __ \ / _ \ \/ /
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* Jukebox | | ( <_> ) \___| < | \_\ ( <_> > < <
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* Firmware |____|_ /\____/ \___ >__|_ \|___ /\____/__/\_ \
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* \/ \/ \/ \/ \/
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*
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* Copyright (C) 2017 Amaury Pouly
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*
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* This program is free software; you can redistribute it and/or
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* modify it under the terms of the GNU General Public License
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* as published by the Free Software Foundation; either version 2
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* of the License, or (at your option) any later version.
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*
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* This software is distributed on an "AS IS" basis, WITHOUT WARRANTY OF ANY
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* KIND, either express or implied.
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*
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****************************************************************************/
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#include <unistd.h>
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#include <fcntl.h>
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#include <sys/ioctl.h>
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#include <sys/stat.h>
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#include "stdint.h"
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#include "stdio.h"
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#include "string.h"
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#include "kernel.h"
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#include "rbendian.h"
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#include "nwz_tuner.h"
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#include "si4700.h"
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#include "power.h"
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static int radio_fd = -1;
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bool tuner_power(bool status)
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{
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if(status != tuner_powered())
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{
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if(status)
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{
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radio_fd = open(NWZ_TUNER_DEV, 0);
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if(radio_fd != -1)
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{
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/* Sony is braindead, opening the radio device mutes all audio (even from the DAC)
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* until SET_FREQ is called with a valid frequency, choose 90MHz because it is valid
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* in all bands */
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struct nwz_tuner_ioctl_t req;
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memset(&req, 0, sizeof(req)); // just to avoid garbage in
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req.freq = 90000;
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int ret = ioctl(radio_fd, NWZ_TUNER_SET_FREQ, &req);
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if(ret != 0)
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perror("tuner set_freq error");
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}
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else
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perror("tuner open error");
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}
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else
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{
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close(radio_fd);
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radio_fd = -1;
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}
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}
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return tuner_powered();
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}
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bool tuner_powered(void)
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{
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return radio_fd != -1;
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}
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/* one can adjust the following depending on the tuner, for now it is calibrated for the si470x
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* which is crazy, because it starts reading at register 0xA and writing at 0x2. We need to
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* "emulate" this behavior... Note that Si470x transmits in big-endian */
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#define READ_START_REG 0xA
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#define WRITE_START_REG 0x2
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#define REG_COUNT 16
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#define REG_SIZE 2
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#define REG_TYPE uint16_t
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#define REG_SWAP swap16
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int fmradio_i2c_write(unsigned char address, unsigned char* buf, int count)
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{
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(void)address;
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struct nwz_tuner_ioctl_t req;
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memset(&req, 0, sizeof(req)); // just to avoid garbage in
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for(int i = 0; i < count / REG_SIZE; i++)
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{
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req.put.regno = (WRITE_START_REG + i) % REG_COUNT;
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req.put.val = REG_SWAP(*(REG_TYPE *)&buf[i * REG_SIZE]);
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int ret = ioctl(radio_fd, NWZ_TUNER_PUT_REG, &req);
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if(ret != 0)
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{
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perror("tuner put_reg error");
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return ret;
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}
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}
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return 0;
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}
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int fmradio_i2c_read(unsigned char address, unsigned char* buf, int count)
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{
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(void)address;
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struct nwz_tuner_ioctl_t req;
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memset(&req, 0, sizeof(req)); // just to avoid garbage in
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int ret = ioctl(radio_fd, NWZ_TUNER_GET_REG_ALL, &req);
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if(ret != 0)
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{
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perror("radio get_reg_all error");
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return ret;
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}
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for(int i = 0; i < count / REG_SIZE; i++)
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{
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/* on version 1, some registers are not reported by Sony's driver */
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int sony_reg = (READ_START_REG + i) % REG_COUNT;
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if(sony_reg < NWZ_TUNER_REG_COUNT)
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*(REG_TYPE *)&buf[i * REG_SIZE] = REG_SWAP(req.regs[sony_reg]);
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else
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*(REG_TYPE *)&buf[i * REG_SIZE] = 0xfeca; /* recognizable pattern for debug menu */
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}
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return 0;
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}
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