1*4882a593Smuzhiyun // SPDX-License-Identifier: GPL-2.0-only
2*4882a593Smuzhiyun /*
3*4882a593Smuzhiyun * PC Speaker beeper driver for Linux
4*4882a593Smuzhiyun *
5*4882a593Smuzhiyun * Copyright (c) 2002 Vojtech Pavlik
6*4882a593Smuzhiyun * Copyright (c) 1992 Orest Zborowski
7*4882a593Smuzhiyun */
8*4882a593Smuzhiyun
9*4882a593Smuzhiyun
10*4882a593Smuzhiyun #include <linux/init.h>
11*4882a593Smuzhiyun #include <linux/input.h>
12*4882a593Smuzhiyun #include <linux/io.h>
13*4882a593Smuzhiyun #include "pcsp.h"
14*4882a593Smuzhiyun #include "pcsp_input.h"
15*4882a593Smuzhiyun
pcspkr_do_sound(unsigned int count)16*4882a593Smuzhiyun static void pcspkr_do_sound(unsigned int count)
17*4882a593Smuzhiyun {
18*4882a593Smuzhiyun unsigned long flags;
19*4882a593Smuzhiyun
20*4882a593Smuzhiyun raw_spin_lock_irqsave(&i8253_lock, flags);
21*4882a593Smuzhiyun
22*4882a593Smuzhiyun if (count) {
23*4882a593Smuzhiyun /* set command for counter 2, 2 byte write */
24*4882a593Smuzhiyun outb_p(0xB6, 0x43);
25*4882a593Smuzhiyun /* select desired HZ */
26*4882a593Smuzhiyun outb_p(count & 0xff, 0x42);
27*4882a593Smuzhiyun outb((count >> 8) & 0xff, 0x42);
28*4882a593Smuzhiyun /* enable counter 2 */
29*4882a593Smuzhiyun outb_p(inb_p(0x61) | 3, 0x61);
30*4882a593Smuzhiyun } else {
31*4882a593Smuzhiyun /* disable counter 2 */
32*4882a593Smuzhiyun outb(inb_p(0x61) & 0xFC, 0x61);
33*4882a593Smuzhiyun }
34*4882a593Smuzhiyun
35*4882a593Smuzhiyun raw_spin_unlock_irqrestore(&i8253_lock, flags);
36*4882a593Smuzhiyun }
37*4882a593Smuzhiyun
pcspkr_stop_sound(void)38*4882a593Smuzhiyun void pcspkr_stop_sound(void)
39*4882a593Smuzhiyun {
40*4882a593Smuzhiyun pcspkr_do_sound(0);
41*4882a593Smuzhiyun }
42*4882a593Smuzhiyun
pcspkr_input_event(struct input_dev * dev,unsigned int type,unsigned int code,int value)43*4882a593Smuzhiyun static int pcspkr_input_event(struct input_dev *dev, unsigned int type,
44*4882a593Smuzhiyun unsigned int code, int value)
45*4882a593Smuzhiyun {
46*4882a593Smuzhiyun unsigned int count = 0;
47*4882a593Smuzhiyun
48*4882a593Smuzhiyun if (atomic_read(&pcsp_chip.timer_active) || !pcsp_chip.pcspkr)
49*4882a593Smuzhiyun return 0;
50*4882a593Smuzhiyun
51*4882a593Smuzhiyun switch (type) {
52*4882a593Smuzhiyun case EV_SND:
53*4882a593Smuzhiyun switch (code) {
54*4882a593Smuzhiyun case SND_BELL:
55*4882a593Smuzhiyun if (value)
56*4882a593Smuzhiyun value = 1000;
57*4882a593Smuzhiyun case SND_TONE:
58*4882a593Smuzhiyun break;
59*4882a593Smuzhiyun default:
60*4882a593Smuzhiyun return -1;
61*4882a593Smuzhiyun }
62*4882a593Smuzhiyun break;
63*4882a593Smuzhiyun
64*4882a593Smuzhiyun default:
65*4882a593Smuzhiyun return -1;
66*4882a593Smuzhiyun }
67*4882a593Smuzhiyun
68*4882a593Smuzhiyun if (value > 20 && value < 32767)
69*4882a593Smuzhiyun count = PIT_TICK_RATE / value;
70*4882a593Smuzhiyun
71*4882a593Smuzhiyun pcspkr_do_sound(count);
72*4882a593Smuzhiyun
73*4882a593Smuzhiyun return 0;
74*4882a593Smuzhiyun }
75*4882a593Smuzhiyun
pcspkr_input_init(struct input_dev ** rdev,struct device * dev)76*4882a593Smuzhiyun int pcspkr_input_init(struct input_dev **rdev, struct device *dev)
77*4882a593Smuzhiyun {
78*4882a593Smuzhiyun int err;
79*4882a593Smuzhiyun
80*4882a593Smuzhiyun struct input_dev *input_dev = input_allocate_device();
81*4882a593Smuzhiyun if (!input_dev)
82*4882a593Smuzhiyun return -ENOMEM;
83*4882a593Smuzhiyun
84*4882a593Smuzhiyun input_dev->name = "PC Speaker";
85*4882a593Smuzhiyun input_dev->phys = "isa0061/input0";
86*4882a593Smuzhiyun input_dev->id.bustype = BUS_ISA;
87*4882a593Smuzhiyun input_dev->id.vendor = 0x001f;
88*4882a593Smuzhiyun input_dev->id.product = 0x0001;
89*4882a593Smuzhiyun input_dev->id.version = 0x0100;
90*4882a593Smuzhiyun input_dev->dev.parent = dev;
91*4882a593Smuzhiyun
92*4882a593Smuzhiyun input_dev->evbit[0] = BIT(EV_SND);
93*4882a593Smuzhiyun input_dev->sndbit[0] = BIT(SND_BELL) | BIT(SND_TONE);
94*4882a593Smuzhiyun input_dev->event = pcspkr_input_event;
95*4882a593Smuzhiyun
96*4882a593Smuzhiyun err = input_register_device(input_dev);
97*4882a593Smuzhiyun if (err) {
98*4882a593Smuzhiyun input_free_device(input_dev);
99*4882a593Smuzhiyun return err;
100*4882a593Smuzhiyun }
101*4882a593Smuzhiyun
102*4882a593Smuzhiyun *rdev = input_dev;
103*4882a593Smuzhiyun return 0;
104*4882a593Smuzhiyun }
105*4882a593Smuzhiyun
pcspkr_input_remove(struct input_dev * dev)106*4882a593Smuzhiyun int pcspkr_input_remove(struct input_dev *dev)
107*4882a593Smuzhiyun {
108*4882a593Smuzhiyun pcspkr_stop_sound();
109*4882a593Smuzhiyun input_unregister_device(dev); /* this also does kfree() */
110*4882a593Smuzhiyun
111*4882a593Smuzhiyun return 0;
112*4882a593Smuzhiyun }
113