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
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
207
208
209
210
211
212
213
214
215
216
217
218
219
220
|
/*
* fmrxd - a daemon to enable and multiplex access to the N950/N9 radio tuner
* Copyright (C) 2011 Javier S. Pedro <maemo@javispedro.com>
*
* 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 program is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
* GNU General Public License for more details.
* You should have received a copy of the GNU General Public License along
* with this program; if not, write to the Free Software Foundation, Inc.,
* 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA.
*/
#include <stdbool.h>
#include <string.h>
#include <errno.h>
#include <unistd.h>
#include <fcntl.h>
#include <sys/ioctl.h>
#include <glib.h>
#include <linux/videodev2.h>
#include "fmrxd.h"
int tuner_fd = -1;
static bool tuner_precise;
static unsigned long tuner_min, tuner_max;
static unsigned long tuner_freq = 0;
static inline bool tuner_is_open()
{
return tuner_fd != -1;
}
static inline unsigned long v4l_to_hz(unsigned f)
{
if (tuner_precise) {
/* f * 62.5 */
return (f * 125UL) / 2;
} else {
return f * 62500UL;
}
}
static inline unsigned hz_to_v4l(unsigned long f)
{
if (tuner_precise) {
/* f / 62.5 */
return (f * 2UL) / 125;
} else {
return f / 62500;
}
}
static inline unsigned long mhz_to_hz(double f)
{
return f * 1000000.0;
}
static inline double hz_to_mhz(unsigned long f)
{
return f / 1000000.0;
}
static bool tuner_tune(unsigned long hz)
{
struct v4l2_frequency t_freq = {
.tuner = TUNER_DEVICE_ID,
.type = V4L2_TUNER_RADIO,
.frequency = hz_to_v4l(hz)
};
g_return_val_if_fail(tuner_is_open(), false);
if (ioctl(tuner_fd, VIDIOC_S_FREQUENCY, &t_freq) < 0) {
g_warning("Failed to tune: %s", strerror(errno));
return false;
}
return true;
}
static unsigned long tuner_get_tuned_freq()
{
struct v4l2_frequency t_freq = {
.tuner = TUNER_DEVICE_ID
};
g_return_val_if_fail(tuner_is_open(), 0);
if (ioctl(tuner_fd, VIDIOC_G_FREQUENCY, &t_freq) < 0) {
g_warning("Failed to get freq: %s", strerror(errno));
return 0;
}
return v4l_to_hz(t_freq.frequency);
}
bool configure_tuner(bool on)
{
if (on) {
struct v4l2_tuner tuner = { 0 };
int res;
tuner_fd = open(TUNER_DEVICE, O_RDONLY);
if (tuner_fd == -1) {
g_critical("Couldn't open V4L2 tuner");
return false;
}
tuner.index = 0;
res = ioctl(tuner_fd, VIDIOC_G_TUNER, &tuner);
if (res < 0) {
g_critical("Couldn't get V4L2 tuner information");
return false;
}
if (tuner.type != V4L2_TUNER_RADIO) {
g_critical("Not a radio tuner\n");
return false;
}
tuner_precise = (tuner.capability & V4L2_TUNER_CAP_LOW) ?
TRUE : FALSE;
tuner_min = v4l_to_hz(tuner.rangelow);
tuner_max = v4l_to_hz(tuner.rangelow);
if (tuner_freq >= tuner_min && tuner_freq <= tuner_max &&
tuner_tune(tuner_freq)) {
// All is well, we are on air!
} else {
// Use whatever frequency the tuner is currently using
tuner_freq = tuner_get_tuned_freq();
}
server_notify_tuned(hz_to_mhz(tuner_freq));
return true;
} else {
if (tuner_fd != -1) {
close(tuner_fd);
tuner_fd = -1;
}
return true;
}
}
bool tuner_set_frequency(double mhz)
{
unsigned long hz = mhz_to_hz(mhz);
if (!tuner_is_open()) {
// This is not an error; we just store the frequency
// and will set it later, when the tuner is opened.
tuner_freq = hz;
return true;
} else if (tuner_tune(hz)) {
g_message("Tuned to %.1f Mhz", mhz);
server_notify_tuned(mhz);
tuner_freq = hz;
signal_reset();
rds_reset();
return true;
}
return false;
}
int32_t tuner_get_signal()
{
struct v4l2_tuner t_tuner = {
.index = TUNER_DEVICE_ID
};
g_return_val_if_fail(tuner_is_open(), 0);
if (ioctl(tuner_fd, VIDIOC_G_TUNER, &t_tuner) < 0) {
g_warning("Failed to get signal level: %s", strerror(errno));
return 0;
}
return t_tuner.signal;
}
bool tuner_search(bool forward)
{
struct v4l2_hw_freq_seek t_freq_seek = {
.tuner = TUNER_DEVICE_ID,
.type = V4L2_TUNER_RADIO,
.seek_upward = forward
};
g_return_val_if_fail(tuner_is_open(), false);
if (ioctl(tuner_fd, VIDIOC_S_HW_FREQ_SEEK, &t_freq_seek) < 0) {
g_warning("Failed to start seek: %s", strerror(errno));
return false;
}
// Search complete, get new frequency
unsigned long hz = tuner_get_tuned_freq();
if (!hz) {
return false;
}
// Got new frequency, fire signals.
tuner_freq = hz;
server_notify_tuned(hz_to_mhz(hz));
signal_reset();
rds_reset();
return true;
}
|
