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/***************************************************************************
* __________ __ ___.
* Open \______ \ ____ ____ | | _\_ |__ _______ ___
* Source | _// _ \_/ ___\| |/ /| __ \ / _ \ \/ /
* Jukebox | | ( <_> ) \___| < | \_\ ( <_> > < <
* Firmware |____|_ /\____/ \___ >__|_ \|___ /\____/__/\_ \
* \/ \/ \/ \/ \/
* $Id$
*
* Copyright (C) 2008 by Bertrik Sikken
*
* 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.
*
****************************************************************************/
/*
This is the fmradio_i2c interface, used by the radio driver
to communicate with the radio tuner chip.
It is implemented using the generic i2c driver, which does "bit-banged"
I2C with a couple of GPIO pins.
*/
#include "config.h"
#include "cpu.h"
#include "system.h"
#include "kernel.h"
#include "tuner.h"
#include "generic_i2c.h"
#include "fmradio_i2c.h"
#include "thread.h"
#include "rds.h"
#if defined(SANSA_CLIP) || defined(SANSA_C200V2)
#define I2C_SCL_GPIO(x) GPIOB_PIN(x)
#define I2C_SDA_GPIO(x) GPIOB_PIN(x)
#define I2C_SCL_GPIO_DIR GPIOB_DIR
#define I2C_SDA_GPIO_DIR GPIOB_DIR
#define I2C_SCL_PIN 4
#define I2C_SDA_PIN 5
#elif defined(SANSA_CLIPV2) || defined(SANSA_CLIPPLUS) \
|| defined(SANSA_CLIPZIP)
#define I2C_SCL_GPIO(x) GPIOB_PIN(x)
#define I2C_SDA_GPIO(x) GPIOB_PIN(x)
#define I2C_SCL_GPIO_DIR GPIOB_DIR
#define I2C_SDA_GPIO_DIR GPIOB_DIR
#define I2C_SCL_PIN 6
#define I2C_SDA_PIN 7
#elif defined(SANSA_M200V4)
#define I2C_SCL_GPIO(x) GPIOD_PIN(x)
#define I2C_SDA_GPIO(x) GPIOD_PIN(x)
#define I2C_SCL_GPIO_DIR GPIOD_DIR
#define I2C_SDA_GPIO_DIR GPIOD_DIR
#define I2C_SCL_PIN 7
#define I2C_SDA_PIN 6
#elif defined(SANSA_FUZE) || defined(SANSA_E200V2)
#define I2C_SCL_GPIO(x) GPIOA_PIN(x)
#define I2C_SDA_GPIO(x) GPIOA_PIN(x)
#define I2C_SCL_GPIO_DIR GPIOA_DIR
#define I2C_SDA_GPIO_DIR GPIOA_DIR
#define I2C_SCL_PIN 6
#define I2C_SDA_PIN 7
#elif defined(SANSA_FUZEV2)
#define I2C_SCL_GPIO(x) GPIOB_PIN(x)
#define I2C_SDA_GPIO(x) GPIOA_PIN(x)
#define I2C_SCL_GPIO_DIR GPIOB_DIR
#define I2C_SDA_GPIO_DIR GPIOA_DIR
#define I2C_SCL_PIN 1
#define I2C_SDA_PIN 0
#else
#error no FM I2C GPIOPIN defines
#endif
static int fm_i2c_bus;
static void fm_scl_dir(bool out)
{
if (out) {
I2C_SCL_GPIO_DIR |= 1 << I2C_SCL_PIN;
} else {
I2C_SCL_GPIO_DIR &= ~(1 << I2C_SCL_PIN);
}
}
static void fm_sda_dir(bool out)
{
if (out) {
I2C_SDA_GPIO_DIR |= 1 << I2C_SDA_PIN;
} else {
I2C_SDA_GPIO_DIR &= ~(1 << I2C_SDA_PIN);
}
}
static void fm_scl_out(bool level)
{
if (level) {
I2C_SCL_GPIO(I2C_SCL_PIN) = 1 << I2C_SCL_PIN;
} else {
I2C_SCL_GPIO(I2C_SCL_PIN) = 0;
}
}
static void fm_sda_out(bool level)
{
if (level) {
I2C_SDA_GPIO(I2C_SDA_PIN) = 1 << I2C_SDA_PIN;
} else {
I2C_SDA_GPIO(I2C_SDA_PIN) = 0;
}
}
static bool fm_scl_in(void)
{
return I2C_SCL_GPIO(I2C_SCL_PIN);
}
static bool fm_sda_in(void)
{
return I2C_SDA_GPIO(I2C_SDA_PIN);
}
static void fm_delay(int delay)
{
if (delay != 0) {
udelay(delay);
}
}
/* interface towards the generic i2c driver */
static const struct i2c_interface fm_i2c_interface = {
.scl_out = fm_scl_out,
.scl_dir = fm_scl_dir,
.sda_out = fm_sda_out,
.sda_dir = fm_sda_dir,
.sda_in = fm_sda_in,
.scl_in = fm_scl_in,
.delay = fm_delay,
.delay_hd_sta = 1,
.delay_hd_dat = 0,
.delay_su_dat = 1,
.delay_su_sto = 1,
.delay_su_sta = 1,
.delay_thigh = 2
};
/* initialise i2c for fmradio */
void fmradio_i2c_init(void)
{
fm_i2c_bus = i2c_add_node(&fm_i2c_interface);
}
int fmradio_i2c_write(unsigned char address, const unsigned char* buf, int count)
{
#ifdef SANSA_FUZEV2
bitclr32(&CCU_IO, 1<<12);
#endif
int ret = i2c_write_data(fm_i2c_bus, address, -1, buf, count);
#ifdef SANSA_FUZEV2
bitset32(&CCU_IO, 1<<12);
#endif
return ret;
}
int fmradio_i2c_read(unsigned char address, unsigned char* buf, int count)
{
#ifdef SANSA_FUZEV2
bitclr32(&CCU_IO, 1<<12);
#endif
int ret = i2c_read_data(fm_i2c_bus, address, -1, buf, count);
#ifdef SANSA_FUZEV2
bitset32(&CCU_IO, 1<<12);
#endif
return ret;
}
#ifdef HAVE_RDS_CAP
/* Low-level RDS Support */
static struct semaphore rds_sema;
static uint32_t rds_stack[DEFAULT_STACK_SIZE/sizeof(uint32_t)];
/* RDS GPIO interrupt handler */
void tuner_isr(void)
{
/* read and clear the interrupt */
if (GPIOA_MIS & (1<<4)) {
semaphore_release(&rds_sema);
GPIOA_IC = (1<<4);
}
}
/* Captures RDS data and processes it */
static void NORETURN_ATTR rds_thread(void)
{
uint16_t rds_data[4];
while (true) {
semaphore_wait(&rds_sema, TIMEOUT_BLOCK);
if (si4700_rds_read_raw(rds_data) && rds_process(rds_data)) {
si4700_rds_set_event();
}
}
}
/* Called with on=true after full radio power up, and with on=false before
powering down */
void si4700_rds_powerup(bool on)
{
GPIOA_IE &= ~(1<<4); /* disable GPIO interrupt */
if (on) {
GPIOA_DIR &= ~(1<<4); /* input */
GPIOA_IS &= ~(1<<4); /* edge detect */
GPIOA_IBE &= ~(1<<4); /* only one edge */
GPIOA_IEV &= ~(1<<4); /* falling edge */
GPIOA_IC = (1<<4); /* clear any pending interrupt */
GPIOA_IE |= (1<<4); /* enable GPIO interrupt */
}
}
/* One-time RDS init at startup */
void si4700_rds_init(void)
{
semaphore_init(&rds_sema, 1, 0);
rds_init();
create_thread(rds_thread, rds_stack, sizeof(rds_stack), 0, "rds"
IF_PRIO(, PRIORITY_REALTIME) IF_COP(, CPU));
}
#endif /* HAVE_RDS_CAP */
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