summaryrefslogtreecommitdiffstats
path: root/firmware/target/arm/s5l8700/fmradio-i2c-meizu.c
blob: 02df8f33a1e90f15436b529ed176978796e604e9 (plain)
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
/***************************************************************************
 *             __________               __   ___.
 *   Open      \______   \ ____   ____ |  | _\_ |__   _______  ___
 *   Source     |       _//  _ \_/ ___\|  |/ /| __ \ /  _ \  \/  /
 *   Jukebox    |    |   (  <_> )  \___|    < | \_\ (  <_> > <  <
 *   Firmware   |____|_  /\____/ \___  >__|_ \|___  /\____/__/\_ \
 *                     \/            \/     \/    \/            \/
 * $Id$
 *
 * Copyright (C) 2009 by Bertrik Sikken
 *
 * 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.
 *
 ****************************************************************************/

/*
    FM radio i2c interface, allows the radio driver to talk to the tuner chip.

    It is implemented using the generic i2c driver, which does "bit-banged"
    I2C with a couple of GPIO pins.
 */

#include "config.h"

#include "inttypes.h"
#include "s5l8700.h"
#include "generic_i2c.h"
#include "fmradio_i2c.h"

#define I2C_GPIO        PDAT3
#define I2C_GPIO_DIR    PCON3
#define I2C_SCL_PIN     4
#define I2C_SDA_PIN     2

#define SCL_DIR_MASK    (0xF<<(4*I2C_SCL_PIN))
#define SCL_DIR_OUT     (1<<(4*I2C_SCL_PIN))
#define SCL_DIR_IN      0
#define SDA_DIR_MASK    (0xF<<(4*I2C_SDA_PIN))
#define SDA_DIR_OUT     (1<<(4*I2C_SDA_PIN))
#define SDA_DIR_IN      0

static int fm_i2c_bus;

static void fm_scl_hi(void)
{
    I2C_GPIO |= 1 << I2C_SCL_PIN;
}

static void fm_scl_lo(void)
{
    I2C_GPIO &= ~(1 << I2C_SCL_PIN);
}

static void fm_sda_hi(void)
{
    I2C_GPIO |= 1 << I2C_SDA_PIN;
}

static void fm_sda_lo(void)
{
    I2C_GPIO &= ~(1 << I2C_SDA_PIN);
}

static void fm_sda_input(void)
{
    I2C_GPIO_DIR = (I2C_GPIO_DIR & ~SDA_DIR_MASK) | SDA_DIR_IN;
}

static void fm_sda_output(void)
{
    I2C_GPIO_DIR = (I2C_GPIO_DIR & ~SDA_DIR_MASK) | SDA_DIR_OUT;
}

static void fm_scl_input(void)
{
    I2C_GPIO_DIR = (I2C_GPIO_DIR & ~SCL_DIR_MASK) | SCL_DIR_IN;
}

static void fm_scl_output(void)
{
    I2C_GPIO_DIR = (I2C_GPIO_DIR & ~SCL_DIR_MASK) | SCL_DIR_OUT;
}

static int fm_sda(void)
{
    return (I2C_GPIO & (1 << I2C_SDA_PIN));
}

static int fm_scl(void)
{
    return (I2C_GPIO & (1 << I2C_SCL_PIN));
}

/* simple and crude delay, used for all delays in the generic i2c driver */
static void fm_delay(void)
{
    volatile int i;

    /* this loop is uncalibrated and could use more sophistication */
    for (i = 0; i < 20; i++) {
    }
}

/* interface towards the generic i2c driver */
static const struct i2c_interface fm_i2c_interface = {
    .scl_hi = fm_scl_hi,
    .scl_lo = fm_scl_lo,
    .sda_hi = fm_sda_hi,
    .sda_lo = fm_sda_lo,
    .sda_input = fm_sda_input,
    .sda_output = fm_sda_output,
    .scl_input = fm_scl_input,
    .scl_output = fm_scl_output,
    .scl = fm_scl,
    .sda = fm_sda,

    .delay_hd_sta = fm_delay,
    .delay_hd_dat = fm_delay,
    .delay_su_dat = fm_delay,
    .delay_su_sto = fm_delay,
    .delay_su_sta = fm_delay,
    .delay_thigh = fm_delay
};

/* initialise i2c for fmradio */
void fmradio_i2c_init(void)
{
    fm_i2c_bus = i2c_add_node(&fm_i2c_interface);
}

int fmradio_i2c_write(unsigned char address, const unsigned char* buf, int count)
{
    return i2c_write_data(fm_i2c_bus, address, -1, buf, count);
}

int fmradio_i2c_read(unsigned char address, unsigned char* buf, int count)
{
    return i2c_read_data(fm_i2c_bus, address, -1, buf, count);
}