firmware/target/arm/as3525/fmradio-i2c-as3525.c

   1 /***************************************************************************
   2  *             __________               __   ___.
   3  *   Open      \______   \ ____   ____ |  | _\_ |__   _______  ___
   4  *   Source     |       _//  _ \_/ ___\|  |/ /| __ \ /  _ \  \/  /
   5  *   Jukebox    |    |   (  <_> )  \___|    < | \_\ (  <_> > <  <
   6  *   Firmware   |____|_  /\____/ \___  >__|_ \|___  /\____/__/\_ \
   7  *                     \/            \/     \/    \/            \/
   8  * $Id$
   9  *
  10  * Copyright (C) 2008 by Bertrik Sikken
  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 /*
  23     This is the fmradio_i2c interface, used by the radio driver
  24     to communicate with the radio tuner chip.
  25
  26     It is implemented using the generic i2c driver, which does "bit-banged"
  27     I2C with a couple of GPIO pins.
  28  */
  29
  30 #include "as3525.h"
  31 #include "system.h"
  32 #include "generic_i2c.h"
  33 #include "fmradio_i2c.h"
  34
  35 #if     defined(SANSA_CLIP) || defined(SANSA_C200V2)
  36 #define I2C_SCL_GPIO(x) GPIOB_PIN(x)
  37 #define I2C_SDA_GPIO(x) GPIOB_PIN(x)
  38 #define I2C_SCL_GPIO_DIR GPIOB_DIR
  39 #define I2C_SDA_GPIO_DIR GPIOB_DIR
  40 #define I2C_SCL_PIN 4
  41 #define I2C_SDA_PIN 5
  42
  43 #elif     defined(SANSA_CLIPV2) || defined(SANSA_CLIPPLUS)
  44 #define I2C_SCL_GPIO(x) GPIOB_PIN(x)
  45 #define I2C_SDA_GPIO(x) GPIOB_PIN(x)
  46 #define I2C_SCL_GPIO_DIR GPIOB_DIR
  47 #define I2C_SDA_GPIO_DIR GPIOB_DIR
  48 #define I2C_SCL_PIN 6
  49 #define I2C_SDA_PIN 7
  50
  51 #elif   defined(SANSA_M200V4)
  52 #define I2C_SCL_GPIO(x) GPIOD_PIN(x)
  53 #define I2C_SDA_GPIO(x) GPIOD_PIN(x)
  54 #define I2C_SCL_GPIO_DIR GPIOD_DIR
  55 #define I2C_SDA_GPIO_DIR GPIOD_DIR
  56 #define I2C_SCL_PIN 7
  57 #define I2C_SDA_PIN 6
  58
  59 #elif   defined(SANSA_FUZE) || defined(SANSA_E200V2)
  60 #define I2C_SCL_GPIO(x) GPIOA_PIN(x)
  61 #define I2C_SDA_GPIO(x) GPIOA_PIN(x)
  62 #define I2C_SCL_GPIO_DIR GPIOA_DIR
  63 #define I2C_SDA_GPIO_DIR GPIOA_DIR
  64 #define I2C_SCL_PIN 6
  65 #define I2C_SDA_PIN 7
  66
  67 #elif   defined(SANSA_FUZEV2)
  68 #define I2C_SCL_GPIO(x) GPIOB_PIN(x)
  69 #define I2C_SDA_GPIO(x) GPIOA_PIN(x)
  70 #define I2C_SCL_GPIO_DIR GPIOB_DIR
  71 #define I2C_SDA_GPIO_DIR GPIOA_DIR
  72 #define I2C_SCL_PIN 1
  73 #define I2C_SDA_PIN 0
  74
  75 #else
  76 #error no FM I2C GPIOPIN defines
  77 #endif
  78
  79 static int fm_i2c_bus;
  80
  81 static void fm_scl_dir(bool out)
  82 {
  83     if (out) {
  84         I2C_SCL_GPIO_DIR |= 1 << I2C_SCL_PIN;
  85     } else {
  86         I2C_SCL_GPIO_DIR &= ~(1 << I2C_SCL_PIN);
  87     }
  88 }
  89
  90 static void fm_sda_dir(bool out)
  91 {
  92     if (out) {
  93         I2C_SDA_GPIO_DIR |= 1 << I2C_SDA_PIN;
  94     } else {
  95         I2C_SDA_GPIO_DIR &= ~(1 << I2C_SDA_PIN);
  96     }
  97 }
  98
  99 static void fm_scl_out(bool level)
 100 {
 101     if (level) {
 102         I2C_SCL_GPIO(I2C_SCL_PIN) = 1 << I2C_SCL_PIN;
 103     } else {
 104         I2C_SCL_GPIO(I2C_SCL_PIN) = 0;
 105     }
 106 }
 107
 108 static void fm_sda_out(bool level)
 109 {
 110     if (level) {
 111         I2C_SDA_GPIO(I2C_SDA_PIN) = 1 << I2C_SDA_PIN;
 112     } else {
 113         I2C_SDA_GPIO(I2C_SDA_PIN) = 0;
 114     }
 115 }
 116
 117 static bool fm_scl_in(void)
 118 {
 119     return I2C_SCL_GPIO(I2C_SCL_PIN);
 120 }
 121
 122 static bool fm_sda_in(void)
 123 {
 124     return I2C_SDA_GPIO(I2C_SDA_PIN);
 125 }
 126
 127 static void fm_delay(int delay)
 128 {
 129     if (delay != 0) {
 130         udelay(delay);
 131     }
 132 }
 133
 134 /* interface towards the generic i2c driver */
 135 static const struct i2c_interface fm_i2c_interface = {
 136     .scl_out = fm_scl_out,
 137     .scl_dir = fm_scl_dir,
 138     .sda_out = fm_sda_out,
 139     .sda_dir = fm_sda_dir,
 140     .sda_in = fm_sda_in,
 141     .scl_in = fm_scl_in,
 142     .delay = fm_delay,
 143
 144     .delay_hd_sta = 1,
 145     .delay_hd_dat = 0,
 146     .delay_su_dat = 1,
 147     .delay_su_sto = 1,
 148     .delay_su_sta = 1,
 149     .delay_thigh = 2
 150 };
 151
 152 /* initialise i2c for fmradio */
 153 void fmradio_i2c_init(void)
 154 {
 155     fm_i2c_bus = i2c_add_node(&fm_i2c_interface);
 156 }
 157
 158 int fmradio_i2c_write(unsigned char address, const unsigned char* buf, int count)
 159 {
 160 #ifdef SANSA_FUZEV2
 161     CCU_IO &= ~(1<<12);
 162 #endif
 163     int ret = i2c_write_data(fm_i2c_bus, address, -1, buf, count);
 164 #ifdef SANSA_FUZEV2
 165     CCU_IO |= 1<<12;
 166 #endif
 167     return ret;
 168 }
 169
 170 int fmradio_i2c_read(unsigned char address, unsigned char* buf, int count)
 171 {
 172 #ifdef SANSA_FUZEV2
 173     CCU_IO &= ~(1<<12);
 174 #endif
 175     int ret = i2c_read_data(fm_i2c_bus, address, -1, buf, count);
 176 #ifdef SANSA_FUZEV2
 177     CCU_IO |= 1<<12;
 178 #endif
 179     return ret;
 180 }