1 // SPDX-License-Identifier: GPL-2.0-only 2 /* 3 * PC Speaker beeper driver for Linux 4 * 5 * Copyright (c) 2002 Vojtech Pavlik 6 * Copyright (c) 1992 Orest Zborowski 7 */ 8 9 10 #include <linux/init.h> 11 #include <linux/input.h> 12 #include <linux/io.h> 13 #include "pcsp.h" 14 #include "pcsp_input.h" 15 16 static void pcspkr_do_sound(unsigned int count) 17 { 18 unsigned long flags; 19 20 raw_spin_lock_irqsave(&i8253_lock, flags); 21 22 if (count) { 23 /* set command for counter 2, 2 byte write */ 24 outb_p(0xB6, 0x43); 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); 30 } else { 31 /* disable counter 2 */ 32 outb(inb_p(0x61) & 0xFC, 0x61); 33 } 34 35 raw_spin_unlock_irqrestore(&i8253_lock, flags); 36 } 37 38 void pcspkr_stop_sound(void) 39 { 40 pcspkr_do_sound(0); 41 } 42 43 static int pcspkr_input_event(struct input_dev *dev, unsigned int type, 44 unsigned int code, int value) 45 { 46 unsigned int count = 0; 47 48 if (atomic_read(&pcsp_chip.timer_active) || !pcsp_chip.pcspkr) 49 return 0; 50 51 switch (type) { 52 case EV_SND: 53 switch (code) { 54 case SND_BELL: 55 if (value) 56 value = 1000; 57 break; 58 case SND_TONE: 59 break; 60 default: 61 return -1; 62 } 63 break; 64 65 default: 66 return -1; 67 } 68 69 if (value > 20 && value < 32767) 70 count = PIT_TICK_RATE / value; 71 72 pcspkr_do_sound(count); 73 74 return 0; 75 } 76 77 int pcspkr_input_init(struct input_dev **rdev, struct device *dev) 78 { 79 int err; 80 81 struct input_dev *input_dev = input_allocate_device(); 82 if (!input_dev) 83 return -ENOMEM; 84 85 input_dev->name = "PC Speaker"; 86 input_dev->phys = "isa0061/input0"; 87 input_dev->id.bustype = BUS_ISA; 88 input_dev->id.vendor = 0x001f; 89 input_dev->id.product = 0x0001; 90 input_dev->id.version = 0x0100; 91 input_dev->dev.parent = dev; 92 93 input_dev->evbit[0] = BIT(EV_SND); 94 input_dev->sndbit[0] = BIT(SND_BELL) | BIT(SND_TONE); 95 input_dev->event = pcspkr_input_event; 96 97 err = input_register_device(input_dev); 98 if (err) { 99 input_free_device(input_dev); 100 return err; 101 } 102 103 *rdev = input_dev; 104 return 0; 105 } 106 107 int pcspkr_input_remove(struct input_dev *dev) 108 { 109 pcspkr_stop_sound(); 110 input_unregister_device(dev); /* this also does kfree() */ 111 112 return 0; 113 } 114