1 // SPDX-License-Identifier: GPL-2.0-only
3 * PC Speaker beeper driver for Linux
5 * Copyright (c) 2002 Vojtech Pavlik
6 * Copyright (c) 1992 Orest Zborowski
10 #include <linux/init.h>
11 #include <linux/input.h>
14 #include "pcsp_input.h"
16 static void pcspkr_do_sound(unsigned int count)
20 raw_spin_lock_irqsave(&i8253_lock, flags);
23 /* set command for counter 2, 2 byte write */
25 /* select desired HZ */
26 outb_p(count & 0xff, 0x42);
27 outb((count >> 8) & 0xff, 0x42);
28 /* enable counter 2 */
29 outb_p(inb_p(0x61) | 3, 0x61);
31 /* disable counter 2 */
32 outb(inb_p(0x61) & 0xFC, 0x61);
35 raw_spin_unlock_irqrestore(&i8253_lock, flags);
38 void pcspkr_stop_sound(void)
43 static int pcspkr_input_event(struct input_dev *dev, unsigned int type,
44 unsigned int code, int value)
46 unsigned int count = 0;
48 if (atomic_read(&pcsp_chip.timer_active) || !pcsp_chip.pcspkr)
68 if (value > 20 && value < 32767)
69 count = PIT_TICK_RATE / value;
71 pcspkr_do_sound(count);
76 int pcspkr_input_init(struct input_dev **rdev, struct device *dev)
80 struct input_dev *input_dev = input_allocate_device();
84 input_dev->name = "PC Speaker";
85 input_dev->phys = "isa0061/input0";
86 input_dev->id.bustype = BUS_ISA;
87 input_dev->id.vendor = 0x001f;
88 input_dev->id.product = 0x0001;
89 input_dev->id.version = 0x0100;
90 input_dev->dev.parent = dev;
92 input_dev->evbit[0] = BIT(EV_SND);
93 input_dev->sndbit[0] = BIT(SND_BELL) | BIT(SND_TONE);
94 input_dev->event = pcspkr_input_event;
96 err = input_register_device(input_dev);
98 input_free_device(input_dev);
106 int pcspkr_input_remove(struct input_dev *dev)
109 input_unregister_device(dev); /* this also does kfree() */