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
|
/*
* Copyright (c) 2023-2024 Ian Marco Moffett and the Osmora Team.
* All rights reserved.
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions are met:
*
* 1. Redistributions of source code must retain the above copyright notice,
* this list of conditions and the following disclaimer.
* 2. Redistributions in binary form must reproduce the above copyright
* notice, this list of conditions and the following disclaimer in the
* documentation and/or other materials provided with the distribution.
* 3. Neither the name of Hyra nor the names of its
* contributors may be used to endorse or promote products derived from
* this software without specific prior written permission.
*
* THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
* AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
* ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT OWNER OR CONTRIBUTORS BE
* LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
* CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
* SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
* INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
* CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
* ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
* POSSIBILITY OF SUCH DAMAGE.
*/
#include <sys/cdefs.h>
#include <sys/errno.h>
#include <sys/param.h>
#include <sys/device.h>
#include <sys/driver.h>
#include <fs/devfs.h>
#include <dev/timer.h>
#include <machine/isa/spkr.h>
#include <machine/isa/i8254.h>
#include <machine/pio.h>
#include <string.h>
#define DIVIDEND 1193180
#define CTRL_PORT 0x61
static struct cdevsw beep_cdevsw;
/*
* Write to the pcspkr
*
* Bits 15:0 - frequency (hz)
* Bits 31:16 - duration (msec)
*/
static int
dev_write(dev_t dev, struct sio_txn *sio, int flags)
{
uint32_t payload = 0;
uint16_t hz;
uint16_t duration;
size_t len = sizeof(payload);
if (sio->len < len) {
return -EINVAL;
}
memcpy(&payload, sio->buf, len);
hz = payload & 0xFFFF;
duration = (payload >> 16) & 0xFFFF;
pcspkr_tone(hz, duration);
return sio->len;
}
static int
beep_init(void)
{
char devname[] = "beep";
devmajor_t major;
dev_t dev;
/* Register the device here */
major = dev_alloc_major();
dev = dev_alloc(major);
dev_register(major, dev, &beep_cdevsw);
devfs_create_entry(devname, major, dev, 0666);
return 0;
}
int
pcspkr_tone(uint16_t freq, uint32_t msec)
{
uint32_t divisor;
uint8_t tmp;
struct timer tmr;
if (req_timer(TIMER_GP, &tmr) != TMRR_SUCCESS)
return -ENOTSUP;
if (__unlikely(tmr.msleep == NULL))
return -ENOTSUP;
divisor = DIVIDEND / freq;
outb(I8254_COMMAND, 0xB6);
outb(I8254_CHANNEL_2, divisor & 0xFF);
outb(I8254_CHANNEL_2, (divisor >> 8) & 0xFF);
/* Oscillate the speaker */
tmp = inb(CTRL_PORT);
if (!ISSET(tmp, 3)) {
tmp |= 3;
outb(CTRL_PORT, tmp);
}
/* Sleep then turn off the speaker */
tmr.msleep(msec);
outb(CTRL_PORT, tmp & ~3);
return 0;
}
static struct cdevsw beep_cdevsw = {
.read = noread,
.write = dev_write
};
DRIVER_EXPORT(beep_init);
|
