bootspkr/bootspkr.c at master · zro404/bootspkr · GitHub

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/*
 * SPDX-FileCopyrightText: 2026 Harish
 *
 * SPDX-License-Identifier: GPL-3.0-only
 */

#include <linux/delay.h>
#include <linux/i8253.h>
#include <linux/io.h>
#include <linux/kernel.h>
#include <linux/module.h>
#include <linux/workqueue.h>

MODULE_DESCRIPTION("Boot PC Speaker beeper driver");
MODULE_LICENSE("GPL");
MODULE_ALIAS_FS("bootspkr");

struct note {
  unsigned int freq;
  unsigned int duration;
};

static const struct note kiss[] = {
    {293, 107}, // 8D4
    {329, 107}, // 8E4
    {349, 643}, // F4.
    {392, 107}, // 8G4
    {349, 429}, // F4
    {329, 429}, // E4
    {293, 429}, // D4
    {261, 429}, // C4
    {293, 857}, // 2D4

    {293, 107}, // 8D4
    {261, 107}, // 8C4
    {293, 857}, // 2D4

    {293, 107},  // 8D4
    {329, 107},  // 8E4
    {349, 643},  // F4.
    {392, 107},  // 8G4
    {349, 429},  // F4
    {329, 429},  // E4
    {261, 429},  // C4
    {329, 429},  // E4
    {293, 1286}, // 2D4.
};

static void play(unsigned int f_hz, unsigned int duration) {
  unsigned int count = PIT_TICK_RATE / f_hz;
  unsigned long flags = 0;

  raw_spin_lock_irqsave(&i8253_lock, flags);
  /* set command for counter 2, 2 byte write */
  outb(0xB6, 0x43);
  /* select desired HZ */
  outb(count & 0xff, 0x42);
  outb((count >> 8) & 0xff, 0x42);
  /* enable counter 2 */
  outb(inb_p(0x61) | 3, 0x61);
  raw_spin_unlock_irqrestore(&i8253_lock, flags);

  msleep(duration);

  raw_spin_lock_irqsave(&i8253_lock, flags);
  /* disable counter 2 */
  outb(inb_p(0x61) & 0xFC, 0x61);
  raw_spin_unlock_irqrestore(&i8253_lock, flags);
}

static void bootspkr_worker(struct work_struct *work) {
  const struct note *seq = kiss;
  int len = ARRAY_SIZE(kiss);
  for (int i = 0; i < len; i++) {
    play(seq[i].freq, seq[i].duration);
  }
}

static DECLARE_WORK(bootspkr_work, bootspkr_worker);

static int __init bootspkr_init(void) {
  printk("Initializing Bootspkr!\n");
  schedule_work(&bootspkr_work);
  return 0;
}

static void __exit bootspkr_exit(void) {
  printk("Goodbye Cruel World!\n");
  cancel_work_sync(&bootspkr_work);
}

module_init(bootspkr_init) module_exit(bootspkr_exit)