310346ebcc
git-svn-id: svn://svn.rockbox.org/rockbox/trunk@23502 a1c6a512-1295-4272-9138-f99709370657
156 lines
3.6 KiB
C
156 lines
3.6 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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* $Id$
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*
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* Copyright (C) 2008 by Bertrik Sikken
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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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/*
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This is the fmradio_i2c interface, used by the radio driver
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to communicate with the radio tuner chip.
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It is implemented using the generic i2c driver, which does "bit-banged"
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I2C with a couple of GPIO pins.
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*/
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#include "as3525.h"
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#include "generic_i2c.h"
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#include "fmradio_i2c.h"
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#if defined(SANSA_CLIP) || defined(SANSA_C200V2)
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#define I2C_GPIO(x) GPIOB_PIN(x)
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#define I2C_GPIO_DIR GPIOB_DIR
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#define I2C_SCL_PIN 4
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#define I2C_SDA_PIN 5
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#elif defined(SANSA_M200V4)
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#define I2C_GPIO(x) GPIOD_PIN(x)
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#define I2C_GPIO_DIR GPIOD_DIR
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#define I2C_SCL_PIN 7
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#define I2C_SDA_PIN 6
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#elif defined(SANSA_FUZE) || defined(SANSA_E200V2)
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#define I2C_GPIO(x) GPIOA_PIN(x)
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#define I2C_GPIO_DIR GPIOA_DIR
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#define I2C_SCL_PIN 6
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#define I2C_SDA_PIN 7
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#else
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#error no FM I2C GPIOPIN defines
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#endif
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static int fm_i2c_bus;
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static void fm_scl_hi(void)
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{
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I2C_GPIO(I2C_SCL_PIN) = 1 << I2C_SCL_PIN;
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}
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static void fm_scl_lo(void)
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{
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I2C_GPIO(I2C_SCL_PIN) = 0;
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}
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static void fm_sda_hi(void)
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{
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I2C_GPIO(I2C_SDA_PIN) = 1 << I2C_SDA_PIN;
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}
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static void fm_sda_lo(void)
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{
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I2C_GPIO(I2C_SDA_PIN) = 0;
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}
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static void fm_sda_input(void)
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{
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I2C_GPIO_DIR &= ~(1 << I2C_SDA_PIN);
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}
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static void fm_sda_output(void)
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{
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I2C_GPIO_DIR |= 1 << I2C_SDA_PIN;
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}
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static void fm_scl_input(void)
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{
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I2C_GPIO_DIR &= ~(1 << I2C_SCL_PIN);
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}
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static void fm_scl_output(void)
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{
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I2C_GPIO_DIR |= 1 << I2C_SCL_PIN;
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}
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static int fm_sda(void)
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{
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return I2C_GPIO(I2C_SDA_PIN);
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}
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static int fm_scl(void)
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{
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return I2C_GPIO(I2C_SCL_PIN);
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}
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/* simple and crude delay, used for all delays in the generic i2c driver */
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static void fm_delay(void)
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{
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volatile int i;
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/* this loop is uncalibrated and could use more sophistication */
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for (i = 0; i < 20; i++) {
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}
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}
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/* interface towards the generic i2c driver */
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static const struct i2c_interface fm_i2c_interface = {
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.scl_hi = fm_scl_hi,
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.scl_lo = fm_scl_lo,
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.sda_hi = fm_sda_hi,
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.sda_lo = fm_sda_lo,
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.sda_input = fm_sda_input,
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.sda_output = fm_sda_output,
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.scl_input = fm_scl_input,
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.scl_output = fm_scl_output,
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.scl = fm_scl,
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.sda = fm_sda,
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.delay_hd_sta = fm_delay,
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.delay_hd_dat = fm_delay,
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.delay_su_dat = fm_delay,
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.delay_su_sto = fm_delay,
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.delay_su_sta = fm_delay,
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.delay_thigh = fm_delay
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};
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/* initialise i2c for fmradio */
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void fmradio_i2c_init(void)
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{
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fm_i2c_bus = i2c_add_node(&fm_i2c_interface);
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}
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int fmradio_i2c_write(unsigned char address, const unsigned char* buf, int count)
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{
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return i2c_write_data(fm_i2c_bus, address, -1, buf, count);
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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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return i2c_read_data(fm_i2c_bus, address, -1, buf, count);
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}
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