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
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
|
/***************************************************************************
* __________ __ ___.
* Open \______ \ ____ ____ | | _\_ |__ _______ ___
* Source | _// _ \_/ ___\| |/ /| __ \ / _ \ \/ /
* Jukebox | | ( <_> ) \___| < | \_\ ( <_> > < <
* Firmware |____|_ /\____/ \___ >__|_ \|___ /\____/__/\_ \
* \/ \/ \/ \/ \/
*
* Module wrapper for SI4709 FM Radio Chip, using /dev/si470x (si4709.ko)
* Samsung YP-R0 & Samsung YP-R1
*
* Copyright (c) 2012 Lorenzo Miori
*
* 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.
*
****************************************************************************/
/* system includes */
#include <unistd.h>
#include <fcntl.h>
#include <sys/ioctl.h>
#include <linux/i2c-dev.h>
#include "stdint.h"
#include "string.h"
/* application includes */
#include "kernel.h"
#include "radio-ypr.h"
#include "power.h"
#include "gpio-target.h"
#include "gpio-ypr.h"
#include "panic.h"
#include "i2c-target.h"
/* 7bits I2C address for Si4709
* (apparently not selectable by pins or revisions) */
#define SI4709_I2C_SLAVE_ADDR 0x10
/** i2c file handle */
static int radio_dev = -1;
/* toggle radio RST pin */
static void power_toggle(bool set)
{
/* setup the GPIO port, as in OF */
gpio_set_iomux(GPIO_FM_BUS_EN, CONFIG_ALT3);
gpio_set_pad(GPIO_FM_BUS_EN, PAD_CTL_SRE_FAST | PAD_CTL_DRV_HIGH);
gpio_direction_output(GPIO_FM_BUS_EN);
gpio_set(GPIO_FM_BUS_EN, set);
}
void radiodev_open(void)
{
int retval = -1; /* ioctl return value */
/* open the I2C bus where the chip is attached to */
radio_dev = open(I2C_BUS_FM_RADIO, O_RDWR);
if (radio_dev == -1)
{
panicf("%s: failed to open /dev/i2c-1 device - %d", __FUNCTION__, retval);
}
else
{
/* device is open, go on */
/* set the slave address for the handle.
* Some other modules might have set the same slave address
* e.g. another module. Let's do a I2C_SLAVE_FORCE which does
* not care about looking for other init'ed i2c slaves */
retval = ioctl(radio_dev, I2C_SLAVE_FORCE, SI4709_I2C_SLAVE_ADDR);
if (retval == -1)
{
/* the ioctl call should never fail, if radio_dev is valid */
panicf("%s: failed to set slave address - %d", __FUNCTION__, retval);
}
else
{
/* initialization completed */
}
}
/* i2c subsystem ready, now toggle power to the chip */
power_toggle(true);
/* 100ms reset delay */
sleep(HZ/10);
}
void radiodev_close(void)
{
/* power the chip down */
power_toggle(false);
/* close the i2c subsystem */
if (radio_dev != -1)
{
(void)close(radio_dev);
}
else
{
/* not opened */
}
/* set back to safe error value */
radio_dev = -1;
}
/* Low-level i2c channel access: write */
int fmradio_i2c_write(unsigned char address, unsigned char* buf, int count)
{
(void)address;
return write(radio_dev, buf, count);
}
/* Low-level i2c channel access: read */
int fmradio_i2c_read(unsigned char address, unsigned char* buf, int count)
{
(void)address;
return read(radio_dev, buf, count);
}
#ifdef HAVE_RDS_CAP
/* Register we are going to poll */
#define STATUSRSSI (0xA)
#define STATUSRSSI_RDSR (0x1 << 15)
/* Low-level RDS Support */
static struct event_queue rds_queue;
static uint32_t rds_stack[DEFAULT_STACK_SIZE / sizeof(uint32_t)];
enum {
Q_POWERUP,
};
static void NORETURN_ATTR rds_thread(void)
{
/* start up frozen */
int timeout = TIMEOUT_BLOCK;
struct queue_event ev;
bool rds_rdy = false;
struct si4700_dbg_info radio_regs;
while (true) {
queue_wait_w_tmo(&rds_queue, &ev, timeout);
switch (ev.id) {
case Q_POWERUP:
/* power up: timeout after 1 tick, else block indefinitely */
timeout = ev.data ? 1 : TIMEOUT_BLOCK;
break;
case SYS_TIMEOUT:
/* Captures RDS data and processes it */
si4700_dbg_info(&radio_regs);
bool rdsr = radio_regs.regs[STATUSRSSI] & STATUSRSSI_RDSR;
if (rdsr != rds_rdy) {
rds_rdy = rdsr;
if (rdsr) {
si4700_rds_process();
}
}
break;
}
}
}
/* true after full radio power up, and false before powering down */
void si4700_rds_powerup(bool on)
{
queue_post(&rds_queue, Q_POWERUP, on);
}
/* One-time RDS init at startup */
void si4700_rds_init(void)
{
queue_init(&rds_queue, false);
create_thread(rds_thread, rds_stack, sizeof(rds_stack), 0, "rds"
IF_PRIO(, PRIORITY_PLAYBACK) IF_COP(, CPU));
}
#endif /* HAVE_RDS_CAP */
|
