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1// SPDX-License-Identifier: GPL-2.0-only2/*3 * PC Speaker beeper driver for Linux4 *5 * Copyright (c) 2002 Vojtech Pavlik6 * Copyright (c) 1992 Orest Zborowski7 */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 16static 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 38void pcspkr_stop_sound(void)39{40 pcspkr_do_sound(0);41}42 43static 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 77int pcspkr_input_init(struct input_dev **rdev, struct device *dev)78{79 int err;80 81 struct input_dev *input_dev = devm_input_allocate_device(dev);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 return err;100 101 *rdev = input_dev;102 return 0;103}104