summaryrefslogtreecommitdiffstats
path: root/firmware/target/arm/imx233/sansa-fuzeplus/fmradio-i2c-fuzeplus.c
blob: ba62ebf59cb59f27ddf341f3e21f3502d8a143ac (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
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
/***************************************************************************
 *             __________               __   ___.
 *   Open      \______   \ ____   ____ |  | _\_ |__   _______  ___
 *   Source     |       _//  _ \_/ ___\|  |/ /| __ \ /  _ \  \/  /
 *   Jukebox    |    |   (  <_> )  \___|    < | \_\ (  <_> > <  <
 *   Firmware   |____|_  /\____/ \___  >__|_ \|___  /\____/__/\_ \
 *                     \/            \/     \/    \/            \/
 * $Id$
 *
 * Copyright (C) 2011 by Amaury Pouly
 *
 * 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.
 *
 ****************************************************************************/

#include "config.h"
#include "system.h"
#include "fmradio_i2c.h"
#include "pinctrl-imx233.h"
#include "generic_i2c.h"
#include "rds.h"
#include "si4700.h"

/**
 * Sansa Fuze+ fmradio uses the following pins:
 * - B0P29 as CE apparently (active high)
 * - B1P24 as SDA
 * - B1P22 as SCL
 * - B2P27 as STC/RDS
 */
static int fmradio_i2c_bus = -1;

static void i2c_scl_dir(bool out)
{
    imx233_pinctrl_enable_gpio(1, 22, out);
}

static void i2c_sda_dir(bool out)
{
    imx233_pinctrl_enable_gpio(1, 24, out);
}

static void i2c_scl_out(bool high)
{
    imx233_pinctrl_set_gpio(1, 22, high);
}

static void i2c_sda_out(bool high)
{
    imx233_pinctrl_set_gpio(1, 24, high);
}

static bool i2c_scl_in(void)
{
    return imx233_pinctrl_get_gpio_mask(1, 1 << 22);
}

static bool i2c_sda_in(void)
{
    return imx233_pinctrl_get_gpio_mask(1, 1 << 24);
}

static void i2c_delay(int d)
{
    udelay(d);
}

struct i2c_interface fmradio_i2c =
{
    .scl_dir = i2c_scl_dir,
    .sda_dir = i2c_sda_dir,
    .scl_out = i2c_scl_out,
    .sda_out = i2c_sda_out,
    .scl_in = i2c_scl_in,
    .sda_in = i2c_sda_in,
    .delay = i2c_delay,
    .delay_hd_sta = 4,
    .delay_hd_dat = 5,
    .delay_su_dat = 1,
    .delay_su_sto = 4,
    .delay_su_sta = 5,
    .delay_thigh = 4
};

void fmradio_i2c_init(void)
{
    imx233_pinctrl_acquire(1, 24, "fmradio i2c");
    imx233_pinctrl_acquire(1, 22, "fmradio i2c");
    imx233_pinctrl_set_function(1, 24, PINCTRL_FUNCTION_GPIO);
    imx233_pinctrl_set_function(1, 22, PINCTRL_FUNCTION_GPIO);
    fmradio_i2c_bus = i2c_add_node(&fmradio_i2c);
}

int fmradio_i2c_write(unsigned char address, const unsigned char* buf, int count)
{
    return i2c_write_data(fmradio_i2c_bus, address, -1, buf, count);
}

int fmradio_i2c_read(unsigned char address, unsigned char* buf, int count)
{
    return i2c_read_data(fmradio_i2c_bus, address, -1, buf, count);
}

#ifdef HAVE_RDS_CAP
/* Low-level RDS Support */
static struct semaphore rds_sema;
static uint32_t rds_stack[DEFAULT_STACK_SIZE / sizeof(uint32_t)];

/* RDS GPIO interrupt handler */
static void stc_rds_callback(int bank, int pin, intptr_t user)
{
    (void) bank;
    (void) pin;
    (void) user;

    semaphore_release(&rds_sema);
}

/* Captures RDS data and processes it */
static void NORETURN_ATTR rds_thread(void)
{
    uint16_t rds_data[4];

    while(true)
    {
        semaphore_wait(&rds_sema, TIMEOUT_BLOCK);
        if(si4700_rds_read_raw(rds_data) && rds_process(rds_data))
            si4700_rds_set_event();
        /* renable callback */
        imx233_pinctrl_setup_irq(2, 27, true, true, false, &stc_rds_callback, 0);
    }
}

/* true after full radio power up, and false before powering down */
void si4700_rds_powerup(bool on)
{
    if(on)
    {
        imx233_pinctrl_acquire(2, 27, "tuner stc/rds");
        imx233_pinctrl_set_function(2, 27, PINCTRL_FUNCTION_GPIO);
        imx233_pinctrl_enable_gpio(2, 27, false);
        /* pin is set to 0 when an RDS packet has arrived */
        imx233_pinctrl_setup_irq(2, 27, true, true, false, &stc_rds_callback, 0);
    }
    else
    {
        imx233_pinctrl_setup_irq(2, 27, false, false, false, NULL, 0);
        imx233_pinctrl_release(2, 27, "tuner stc/rds");
    }
}

/* One-time RDS init at startup */
void si4700_rds_init(void)
{
    semaphore_init(&rds_sema, 1, 0);
    rds_init();
    create_thread(rds_thread, rds_stack, sizeof(rds_stack), 0, "rds"
        IF_PRIO(, PRIORITY_REALTIME) IF_COP(, CPU));
}
#endif /* HAVE_RDS_CAP */