123 lines
3.5 KiB
C
123 lines
3.5 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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* Module wrapper for SI4709 FM Radio Chip, using /dev/si470x (si4709.ko)
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* Samsung YP-R0 & Samsung YP-R1
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*
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* Copyright (c) 2012 Lorenzo Miori
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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 "stdint.h"
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#include "string.h"
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#include "kernel.h"
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#include "radio-ypr.h"
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#include "si4700.h"
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#include "power.h"
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static int radio_dev = -1;
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void radiodev_open(void) {
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radio_dev = open("/dev/si470x", O_RDWR);
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}
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void radiodev_close(void) {
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close(radio_dev);
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}
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/* High-level registers access */
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void si4709_write_reg(int addr, uint16_t value) {
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sSi4709_t r = { .addr = addr, .value = value };
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ioctl(radio_dev, IOCTL_SI4709_WRITE_BYTE, &r);
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}
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uint16_t si4709_read_reg(int addr) {
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sSi4709_t r = { .addr = addr, .value = 0 };
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ioctl(radio_dev, IOCTL_SI4709_READ_BYTE, &r);
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return r.value;
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}
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/* Low-level i2c channel access */
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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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sSi4709_i2c_t r = { .size = count, .buf = buf };
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return ioctl(radio_dev, IOCTL_SI4709_I2C_WRITE, &r);
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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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sSi4709_i2c_t r = { .size = count, .buf = buf };
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return ioctl(radio_dev, IOCTL_SI4709_I2C_READ, &r);
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}
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#ifdef HAVE_RDS_CAP
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/* Register we are going to poll */
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#define STATUSRSSI 0xA
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#define STATUSRSSI_RDSR (0x1 << 15)
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/* Low-level RDS Support */
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static struct event_queue rds_queue;
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static uint32_t rds_stack[DEFAULT_STACK_SIZE / sizeof(uint32_t)];
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enum {
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Q_POWERUP,
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};
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static void NORETURN_ATTR rds_thread(void)
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{
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/* start up frozen */
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int timeout = TIMEOUT_BLOCK;
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struct queue_event ev;
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while (true) {
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queue_wait_w_tmo(&rds_queue, &ev, timeout);
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switch (ev.id) {
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case Q_POWERUP:
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/* power up: timeout after 1 tick, else block indefinitely */
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timeout = ev.data ? 1 : TIMEOUT_BLOCK;
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break;
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case SYS_TIMEOUT:
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/* Captures RDS data and processes it */
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if ((si4709_read_reg(STATUSRSSI) & STATUSRSSI_RDSR) >> 8) {
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si4700_rds_process();
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}
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break;
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}
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}
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}
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/* true after full radio power up, and false before powering down */
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void si4700_rds_powerup(bool on)
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{
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queue_post(&rds_queue, Q_POWERUP, on);
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}
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/* One-time RDS init at startup */
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void si4700_rds_init(void)
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{
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queue_init(&rds_queue, false);
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create_thread(rds_thread, rds_stack, sizeof(rds_stack), 0, "rds"
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IF_PRIO(, PRIORITY_PLAYBACK) IF_COP(, CPU));
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}
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#endif /* HAVE_RDS_CAP */
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