97 lines
1.9 KiB
C
97 lines
1.9 KiB
C
/**
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* @file modules/pcspkr.c
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* @brief PC beeper device interface
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*
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* Use with @ref apps/beep.c to play music.
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*
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* @copyright
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* This file is part of ToaruOS and is released under the terms
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* of the NCSA / University of Illinois License - see LICENSE.md
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* Copyright (C) 2014-2021 K. Lange
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*/
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#include <kernel/module.h>
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#include <kernel/printf.h>
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#include <kernel/process.h>
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#include <kernel/time.h>
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#include <kernel/vfs.h>
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#include <kernel/arch/x86_64/ports.h>
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static void note(int length, int freq) {
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uint8_t t;
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if (length == 0) {
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t = inportb(0x61) & 0xFC;
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outportb(0x61, t);
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return;
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}
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uint32_t div = 11931800 / freq;
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outportb(0x43, 0xb6);
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outportb(0x42, (uint8_t)(div));
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outportb(0x42, (uint8_t)(div >> 8));
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t = inportb(0x61);
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outportb(0x61, t | 0x3);
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if (length > 0) {
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unsigned long s, ss;
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relative_time(length / 1000, (length % 1000) * 1000, &s, &ss);
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sleep_until((process_t*)this_core->current_process, s, ss);
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switch_task(0);
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t = inportb(0x61) & 0xFC;
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outportb(0x61, t);
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}
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}
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struct spkr {
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int length;
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int frequency;
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};
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static ssize_t write_spkr(fs_node_t *node, off_t offset, size_t size, uint8_t *buffer) {
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if (!size % (sizeof(struct spkr))) {
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return 0;
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}
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struct spkr * s = (struct spkr *)buffer;
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while ((uintptr_t)s < (uintptr_t)buffer + size) {
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note(s->length, s->frequency);
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s++;
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}
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return (uintptr_t)s - (uintptr_t)buffer;
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}
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static fs_node_t * spkr_device_create(void) {
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fs_node_t * fnode = malloc(sizeof(fs_node_t));
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memset(fnode, 0x00, sizeof(fs_node_t));
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snprintf(fnode->name, 5, "spkr");
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fnode->mask = 0660; /* TODO need a speaker group */
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fnode->gid = 1;
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fnode->flags = FS_CHARDEVICE;
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fnode->write = write_spkr;
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return fnode;
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}
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static int init(int argc, char * argv[]) {
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fs_node_t * node = spkr_device_create();
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vfs_mount("/dev/spkr", node);
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return 0;
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}
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static int fini(void) {
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return 0;
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}
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struct Module metadata = {
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.name = "pcspkr",
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.init = init,
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.fini = fini,
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};
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