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
|
/** \file beep-driver-evdev.c
* \brief implement the beep evdev driver
* \author Copyright (C) 2000-2010 Johnathan Nightingale
* \author Copyright (C) 2010-2013 Gerfried Fuchs
* \author Copyright (C) 2019 Hans Ulrich Niedermann
*
* 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.
*
*
* \defgroup beep_driver_evdev Linux evdev API driver
* \ingroup beep_driver
*
* @{
*
*/
#include <stddef.h>
#include <errno.h>
#include <string.h>
#include <sys/ioctl.h>
#include <sys/types.h>
#include <sys/stat.h>
#include <unistd.h>
#include <linux/input.h>
#include "beep-compiler.h"
#include "beep-drivers.h"
#include "beep-library.h"
#include "beep-log.h"
static
int open_checked_device(const char *const device_name)
{
const int fd = open_checked_char_device(device_name);
if (fd == -1) {
return -1;
}
if (-1 == ioctl(fd, EVIOCGSND(0))) {
log_verbose("evdev: %d does not implement EV_SND API", fd);
return -1;
}
return fd;
}
static
bool driver_detect(beep_driver *driver, const char *console_device)
{
if (console_device) {
log_verbose("evdev driver_detect %p %s",
(void *)driver, console_device);
} else {
log_verbose("evdev driver_detect %p %p",
(void *)driver, (const void *)console_device);
}
if (console_device) {
const int fd = open_checked_device(console_device);
if (fd >= 0) {
driver->device_fd = fd;
driver->device_name = console_device;
return true;
}
} else {
static
const char *const default_name =
"/dev/input/by-path/platform-pcspkr-event-spkr";
const int fd = open_checked_device(default_name);
if (fd >= 0) {
driver->device_fd = fd;
driver->device_name = default_name;
return true;
}
}
return false;
}
static
void driver_init(beep_driver *driver)
{
log_verbose("evdev driver_init %p", (void *)driver);
}
static
void driver_fini(beep_driver *driver)
{
log_verbose("evdev driver_fini %p", (void *)driver);
close(driver->device_fd);
driver->device_fd = -1;
}
static
void driver_begin_tone(beep_driver *driver, const uint16_t freq)
{
log_verbose("evdev driver_begin_tone %p %u", (void *)driver, freq);
struct input_event e;
memset(&e, 0, sizeof(e));
e.type = EV_SND;
e.code = SND_TONE;
e.value = freq;
if (sizeof(e) != write(driver->device_fd, &e, sizeof(e))) {
/* If we cannot use the sound API, we cannot silence the sound either */
safe_error_exit("write EV_SND");
}
}
static
void driver_end_tone(beep_driver *driver)
{
log_verbose("evdev driver_end_tone %p", (void *)driver);
struct input_event e;
memset(&e, 0, sizeof(e));
e.type = EV_SND;
e.code = SND_TONE;
e.value = 0;
if (sizeof(e) != write(driver->device_fd, &e, sizeof(e))) {
safe_error_exit("write EV_SND");
}
}
static
beep_driver driver_data =
{
"evdev",
NULL,
driver_detect,
driver_init,
driver_fini,
driver_begin_tone,
driver_end_tone,
0,
NULL
};
static
void beep_driver_evdev_constructor(void)
CONSTRUCTOR_FUNCTION;
static
void beep_driver_evdev_constructor(void)
{
log_verbose("beep_driver_evdev_constructor");
beep_drivers_register(&driver_data);
}
/** @} */
/*
* Local Variables:
* c-basic-offset: 4
* indent-tabs-mode: nil
* End:
*/
|
