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/***************************************************************************
* __________ __ ___.
* Open \______ \ ____ ____ | | _\_ |__ _______ ___
* Source | _// _ \_/ ___\| |/ /| __ \ / _ \ \/ /
* Jukebox | | ( <_> ) \___| < | \_\ ( <_> > < <
* Firmware |____|_ /\____/ \___ >__|_ \|___ /\____/__/\_ \
* \/ \/ \/ \/ \/
* $Id$
*
* Copyright (C) 2011 by 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 "config.h"
#include "system.h"
#include "fmradio_i2c.h"
#include "pinctrl-imx233.h"
#include "generic_i2c.h"
#include "rds.h"
#include "si4700.h"
/**
* Sansa Fuze+ fmradio uses the following pins:
* - B0P29 as CE apparently (active high)
* - B1P24 as SDA
* - B1P22 as SCL
* - B2P27 as STC/RDS
*/
static int fmradio_i2c_bus = -1;
static void i2c_scl_dir(bool out)
{
imx233_enable_gpio_output(1, 22, out);
}
static void i2c_sda_dir(bool out)
{
imx233_enable_gpio_output(1, 24, out);
}
static void i2c_scl_out(bool high)
{
imx233_set_gpio_output(1, 22, high);
}
static void i2c_sda_out(bool high)
{
imx233_set_gpio_output(1, 24, high);
}
static bool i2c_scl_in(void)
{
return imx233_get_gpio_input_mask(1, 1 << 22);
}
static bool i2c_sda_in(void)
{
return imx233_get_gpio_input_mask(1, 1 << 24);
}
static void i2c_delay(int d)
{
udelay(d);
}
struct i2c_interface fmradio_i2c =
{
.scl_dir = i2c_scl_dir,
.sda_dir = i2c_sda_dir,
.scl_out = i2c_scl_out,
.sda_out = i2c_sda_out,
.scl_in = i2c_scl_in,
.sda_in = i2c_sda_in,
.delay = i2c_delay,
.delay_hd_sta = 4,
.delay_hd_dat = 5,
.delay_su_dat = 1,
.delay_su_sto = 4,
.delay_su_sta = 5,
.delay_thigh = 4
};
void fmradio_i2c_init(void)
{
imx233_pinctrl_acquire_pin(1, 24, "fmradio i2c");
imx233_pinctrl_acquire_pin(1, 22, "fmradio i2c");
imx233_set_pin_function(1, 24, PINCTRL_FUNCTION_GPIO);
imx233_set_pin_function(1, 22, PINCTRL_FUNCTION_GPIO);
fmradio_i2c_bus = i2c_add_node(&fmradio_i2c);
}
int fmradio_i2c_write(unsigned char address, const unsigned char* buf, int count)
{
return i2c_write_data(fmradio_i2c_bus, address, -1, buf, count);
}
int fmradio_i2c_read(unsigned char address, unsigned char* buf, int count)
{
return i2c_read_data(fmradio_i2c_bus, address, -1, buf, count);
}
#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 */
static void stc_rds_callback(int bank, int pin)
{
(void) bank;
(void) pin;
semaphore_release(&rds_sema);
}
/* 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();
/* renable callback */
imx233_setup_pin_irq(2, 27, true, true, false, &stc_rds_callback);
}
}
/* true after full radio power up, and false before powering down */
void si4700_rds_powerup(bool on)
{
if(on)
{
imx233_pinctrl_acquire_pin(2, 27, "tuner stc/rds");
imx233_set_pin_function(2, 27, PINCTRL_FUNCTION_GPIO);
imx233_enable_gpio_output(2, 27, false);
/* pin is set to 0 when an RDS packet has arrived */
imx233_setup_pin_irq(2, 27, true, true, false, &stc_rds_callback);
}
else
{
imx233_setup_pin_irq(2, 27, false, false, false, NULL);
imx233_pinctrl_release_pin(2, 27, "tuner stc/rds");
}
}
/* 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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