90 lines
1.8 KiB
C
90 lines
1.8 KiB
C
/* vim: tabstop=4 shiftwidth=4 noexpandtab
|
|
* This file is part of ToaruOS and is released under the terms
|
|
* of the NCSA / University of Illinois License - see LICENSE.md
|
|
* Copyright (C) 2014-2018 K. Lange
|
|
*/
|
|
#include <kernel/module.h>
|
|
#include <kernel/printf.h>
|
|
#include <kernel/process.h>
|
|
#include <kernel/time.h>
|
|
#include <kernel/vfs.h>
|
|
|
|
#include <kernel/arch/x86_64/ports.h>
|
|
|
|
static void note(int length, int freq) {
|
|
|
|
uint8_t t;
|
|
|
|
if (length == 0) {
|
|
t = inportb(0x61) & 0xFC;
|
|
outportb(0x61, t);
|
|
return;
|
|
}
|
|
|
|
uint32_t div = 11931800 / freq;
|
|
|
|
outportb(0x43, 0xb6);
|
|
outportb(0x42, (uint8_t)(div));
|
|
outportb(0x42, (uint8_t)(div >> 8));
|
|
|
|
t = inportb(0x61);
|
|
outportb(0x61, t | 0x3);
|
|
|
|
if (length > 0) {
|
|
unsigned long s, ss;
|
|
relative_time(length / 1000, (length % 1000) * 1000, &s, &ss);
|
|
sleep_until((process_t*)this_core->current_process, s, ss);
|
|
switch_task(0);
|
|
|
|
t = inportb(0x61) & 0xFC;
|
|
outportb(0x61, t);
|
|
}
|
|
|
|
}
|
|
|
|
struct spkr {
|
|
int length;
|
|
int frequency;
|
|
};
|
|
|
|
static ssize_t write_spkr(fs_node_t *node, off_t offset, size_t size, uint8_t *buffer) {
|
|
if (!size % (sizeof(struct spkr))) {
|
|
return 0;
|
|
}
|
|
|
|
struct spkr * s = (struct spkr *)buffer;
|
|
while ((uintptr_t)s < (uintptr_t)buffer + size) {
|
|
note(s->length, s->frequency);
|
|
s++;
|
|
}
|
|
|
|
return (uintptr_t)s - (uintptr_t)buffer;
|
|
}
|
|
|
|
static fs_node_t * spkr_device_create(void) {
|
|
fs_node_t * fnode = malloc(sizeof(fs_node_t));
|
|
memset(fnode, 0x00, sizeof(fs_node_t));
|
|
snprintf(fnode->name, 5, "spkr");
|
|
fnode->mask = 0666; /* TODO need a speaker group */
|
|
fnode->flags = FS_CHARDEVICE;
|
|
fnode->write = write_spkr;
|
|
return fnode;
|
|
}
|
|
|
|
static int init(int argc, char * argv[]) {
|
|
fs_node_t * node = spkr_device_create();
|
|
vfs_mount("/dev/spkr", node);
|
|
return 0;
|
|
}
|
|
|
|
static int fini(void) {
|
|
return 0;
|
|
}
|
|
|
|
struct Module metadata = {
|
|
.name = "pcspkr",
|
|
.init = init,
|
|
.fini = fini,
|
|
};
|
|
|