645680d62b
Past development has proved that one can mistakely use the same pin for two uses without noticing. Since this causes extremely hard to find bugs, the infrastructure will allow to register pin uses and panic when a conflict is detected. The pinctrl debug now shows the pin uses when its support is compiled in. Change-Id: Idb2d5235ce09207d77aa474d6f158e72b933761a
105 lines
2.7 KiB
C
105 lines
2.7 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) 2011 by Amaury Pouly
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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 "config.h"
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#include "system.h"
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#include "fmradio_i2c.h"
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#include "pinctrl-imx233.h"
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#include "generic_i2c.h"
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/**
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* Sansa Fuze+ fmradio uses the following pins:
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* - B0P29 as CE apparently (active high)
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* - B1P24 as SDA
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* - B1P22 as SCL
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*/
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static int fmradio_i2c_bus = -1;
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static void i2c_scl_dir(bool out)
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{
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imx233_enable_gpio_output(1, 22, out);
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}
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static void i2c_sda_dir(bool out)
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{
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imx233_enable_gpio_output(1, 24, out);
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}
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static void i2c_scl_out(bool high)
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{
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imx233_set_gpio_output(1, 22, high);
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}
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static void i2c_sda_out(bool high)
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{
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imx233_set_gpio_output(1, 24, high);
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}
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static bool i2c_scl_in(void)
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{
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return imx233_get_gpio_input_mask(1, 1 << 22);
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}
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static bool i2c_sda_in(void)
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{
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return imx233_get_gpio_input_mask(1, 1 << 24);
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}
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static void i2c_delay(int d)
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{
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udelay(d);
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}
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struct i2c_interface fmradio_i2c =
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{
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.scl_dir = i2c_scl_dir,
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.sda_dir = i2c_sda_dir,
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.scl_out = i2c_scl_out,
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.sda_out = i2c_sda_out,
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.scl_in = i2c_scl_in,
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.sda_in = i2c_sda_in,
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.delay = i2c_delay,
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.delay_hd_sta = 4,
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.delay_hd_dat = 5,
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.delay_su_dat = 1,
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.delay_su_sto = 4,
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.delay_su_sta = 5,
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.delay_thigh = 4
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};
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void fmradio_i2c_init(void)
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{
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imx233_pinctrl_acquire_pin(1, 24, "fmradio i2c");
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imx233_pinctrl_acquire_pin(1, 22, "fmradio i2c");
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imx233_set_pin_function(1, 24, PINCTRL_FUNCTION_GPIO);
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imx233_set_pin_function(1, 22, PINCTRL_FUNCTION_GPIO);
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fmradio_i2c_bus = i2c_add_node(&fmradio_i2c);
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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(fmradio_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(fmradio_i2c_bus, address, -1, buf, count);
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}
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