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/***************************************************************************
* __________ __ ___.
* Open \______ \ ____ ____ | | _\_ |__ _______ ___
* Source | _// _ \_/ ___\| |/ /| __ \ / _ \ \/ /
* Jukebox | | ( <_> ) \___| < | \_\ ( <_> > < <
* Firmware |____|_ /\____/ \___ >__|_ \|___ /\____/__/\_ \
* \/ \/ \/ \/ \/
*
* Module wrapper for SI4709 FM Radio Chip, using /dev/si470x (si4709.ko)
* Samsung YP-R0 & Samsung YP-R1
*
* Copyright (c) 2012 Lorenzo Miori
*
* 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 "stdint.h"
#include "string.h"
#include "kernel.h"
#include "radio-ypr.h"
#include "rds.h"
#include "si4700.h"
#include "power.h"
static int radio_dev = -1;
void radiodev_open(void) {
radio_dev = open("/dev/si470x", O_RDWR);
}
void radiodev_close(void) {
close(radio_dev);
}
/* High-level registers access */
void si4709_write_reg(int addr, uint16_t value) {
sSi4709_t r = { .addr = addr, .value = value };
ioctl(radio_dev, IOCTL_SI4709_WRITE_BYTE, &r);
}
uint16_t si4709_read_reg(int addr) {
sSi4709_t r = { .addr = addr, .value = 0 };
ioctl(radio_dev, IOCTL_SI4709_READ_BYTE, &r);
return r.value;
}
/* Low-level i2c channel access */
int fmradio_i2c_write(unsigned char address, unsigned char* buf, int count)
{
(void)address;
sSi4709_i2c_t r = { .size = count, .buf = buf };
return ioctl(radio_dev, IOCTL_SI4709_I2C_WRITE, &r);
}
int fmradio_i2c_read(unsigned char address, unsigned char* buf, int count)
{
(void)address;
sSi4709_i2c_t r = { .size = count, .buf = buf };
return ioctl(radio_dev, IOCTL_SI4709_I2C_READ, &r);
}
#ifdef HAVE_RDS_CAP
/* Register we are going to poll */
#define STATUSRSSI 0xA
#define STATUSRSSI_RDSR (0x1 << 15)
/* Low-level RDS Support */
static struct event_queue rds_queue;
static uint32_t rds_stack[DEFAULT_STACK_SIZE / sizeof(uint32_t)];
static uint16_t rds_data[4];
enum {
Q_POWERUP,
};
static void NORETURN_ATTR rds_thread(void)
{
/* start up frozen */
int timeout = TIMEOUT_BLOCK;
struct queue_event ev;
while (true) {
queue_wait_w_tmo(&rds_queue, &ev, timeout);
switch (ev.id) {
case Q_POWERUP:
/* power up: timeout after 1 tick, else block indefinitely */
timeout = ev.data ? 1 : TIMEOUT_BLOCK;
break;
case SYS_TIMEOUT:
/* Captures RDS data and processes it */
if ((si4709_read_reg(STATUSRSSI) & STATUSRSSI_RDSR) >> 8) {
if (si4700_rds_read_raw(rds_data) && rds_process(rds_data))
si4700_rds_set_event();
}
break;
}
}
}
/* true after full radio power up, and false before powering down */
void si4700_rds_powerup(bool on)
{
queue_post(&rds_queue, Q_POWERUP, on);
}
/* One-time RDS init at startup */
void si4700_rds_init(void)
{
queue_init(&rds_queue, false);
create_thread(rds_thread, rds_stack, sizeof(rds_stack), 0, "rds"
IF_PRIO(, PRIORITY_PLAYBACK) IF_COP(, CPU));
rds_init();
}
#endif /* HAVE_RDS_CAP */
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