firmware/target/arm/imx233/sansa-fuzeplus/fmradio-i2c-fuzeplus.c

   1 /***************************************************************************
   2  *             __________               __   ___.
   3  *   Open      \______   \ ____   ____ |  | _\_ |__   _______  ___
   4  *   Source     |       _//  _ \_/ ___\|  |/ /| __ \ /  _ \  \/  /
   5  *   Jukebox    |    |   (  <_> )  \___|    < | \_\ (  <_> > <  <
   6  *   Firmware   |____|_  /\____/ \___  >__|_ \|___  /\____/__/\_ \
   7  *                     \/            \/     \/    \/            \/
   8  * $Id$
   9  *
  10  * Copyright (C) 2011 by Amaury Pouly
  11  *
  12  * This program is free software; you can redistribute it and/or
  13  * modify it under the terms of the GNU General Public License
  14  * as published by the Free Software Foundation; either version 2
  15  * of the License, or (at your option) any later version.
  16  *
  17  * This software is distributed on an "AS IS" basis, WITHOUT WARRANTY OF ANY
  18  * KIND, either express or implied.
  19  *
  20  ****************************************************************************/
  21
  22 #include "config.h"
  23 #include "system.h"
  24 #include "fmradio_i2c.h"
  25 #include "pinctrl-imx233.h"
  26 #include "generic_i2c.h"
  27
  28 /**
  29  * Sansa Fuze+ fmradio uses the following pins:
  30  * - B0P29 as CE apparently (active high)
  31  * - B1P24 as SDA
  32  * - B1P22 as SCL
  33  */
  34 static int fmradio_i2c_bus = -1;
  35
  36 static void i2c_scl_dir(bool out)
  37 {
  38     imx233_enable_gpio_output(1, 22, out);
  39 }
  40
  41 static void i2c_sda_dir(bool out)
  42 {
  43     imx233_enable_gpio_output(1, 24, out);
  44 }
  45
  46 static void i2c_scl_out(bool high)
  47 {
  48     imx233_set_gpio_output(1, 22, high);
  49 }
  50
  51 static void i2c_sda_out(bool high)
  52 {
  53     imx233_set_gpio_output(1, 24, high);
  54 }
  55
  56 static bool i2c_scl_in(void)
  57 {
  58     return imx233_get_gpio_input_mask(1, 1 << 22);
  59 }
  60
  61 static bool i2c_sda_in(void)
  62 {
  63     return imx233_get_gpio_input_mask(1, 1 << 24);
  64 }
  65
  66 static void i2c_delay(int d)
  67 {
  68     udelay(d);
  69 }
  70
  71 struct i2c_interface fmradio_i2c =
  72 {
  73     .scl_dir = i2c_scl_dir,
  74     .sda_dir = i2c_sda_dir,
  75     .scl_out = i2c_scl_out,
  76     .sda_out = i2c_sda_out,
  77     .scl_in = i2c_scl_in,
  78     .sda_in = i2c_sda_in,
  79     .delay = i2c_delay,
  80     .delay_hd_sta = 4,
  81     .delay_hd_dat = 5,
  82     .delay_su_dat = 1,
  83     .delay_su_sto = 4,
  84     .delay_su_sta = 5,
  85     .delay_thigh = 4
  86 };
  87
  88 void fmradio_i2c_init(void)
  89 {
  90     imx233_set_pin_function(1, 24, PINCTRL_FUNCTION_GPIO);
  91     imx233_set_pin_function(1, 22, PINCTRL_FUNCTION_GPIO);
  92     fmradio_i2c_bus = i2c_add_node(&fmradio_i2c);
  93 }
  94
  95 int fmradio_i2c_write(unsigned char address, const unsigned char* buf, int count)
  96 {
  97     return i2c_write_data(fmradio_i2c_bus, address, -1, buf, count);
  98 }
  99
 100 int fmradio_i2c_read(unsigned char address, unsigned char* buf, int count)
 101 {
 102     return i2c_read_data(fmradio_i2c_bus, address, -1, buf, count);
 103 }