| // SPDX-License-Identifier: GPL-2.0-only |
| /* |
| * PC Speaker beeper driver for Linux |
| * |
| * Copyright (c) 2002 Vojtech Pavlik |
| * Copyright (c) 1992 Orest Zborowski |
| */ |
| |
| |
| #include <linux/init.h> |
| #include <linux/input.h> |
| #include <linux/io.h> |
| #include "pcsp.h" |
| #include "pcsp_input.h" |
| |
| static void pcspkr_do_sound(unsigned int count) |
| { |
| unsigned long flags; |
| |
| raw_spin_lock_irqsave(&i8253_lock, flags); |
| |
| if (count) { |
| /* set command for counter 2, 2 byte write */ |
| outb_p(0xB6, 0x43); |
| /* select desired HZ */ |
| outb_p(count & 0xff, 0x42); |
| outb((count >> 8) & 0xff, 0x42); |
| /* enable counter 2 */ |
| outb_p(inb_p(0x61) | 3, 0x61); |
| } else { |
| /* disable counter 2 */ |
| outb(inb_p(0x61) & 0xFC, 0x61); |
| } |
| |
| raw_spin_unlock_irqrestore(&i8253_lock, flags); |
| } |
| |
| void pcspkr_stop_sound(void) |
| { |
| pcspkr_do_sound(0); |
| } |
| |
| static int pcspkr_input_event(struct input_dev *dev, unsigned int type, |
| unsigned int code, int value) |
| { |
| unsigned int count = 0; |
| |
| if (atomic_read(&pcsp_chip.timer_active) || !pcsp_chip.pcspkr) |
| return 0; |
| |
| switch (type) { |
| case EV_SND: |
| switch (code) { |
| case SND_BELL: |
| if (value) |
| value = 1000; |
| break; |
| case SND_TONE: |
| break; |
| default: |
| return -1; |
| } |
| break; |
| |
| default: |
| return -1; |
| } |
| |
| if (value > 20 && value < 32767) |
| count = PIT_TICK_RATE / value; |
| |
| pcspkr_do_sound(count); |
| |
| return 0; |
| } |
| |
| int pcspkr_input_init(struct input_dev **rdev, struct device *dev) |
| { |
| int err; |
| |
| struct input_dev *input_dev = input_allocate_device(); |
| if (!input_dev) |
| return -ENOMEM; |
| |
| input_dev->name = "PC Speaker"; |
| input_dev->phys = "isa0061/input0"; |
| input_dev->id.bustype = BUS_ISA; |
| input_dev->id.vendor = 0x001f; |
| input_dev->id.product = 0x0001; |
| input_dev->id.version = 0x0100; |
| input_dev->dev.parent = dev; |
| |
| input_dev->evbit[0] = BIT(EV_SND); |
| input_dev->sndbit[0] = BIT(SND_BELL) | BIT(SND_TONE); |
| input_dev->event = pcspkr_input_event; |
| |
| err = input_register_device(input_dev); |
| if (err) { |
| input_free_device(input_dev); |
| return err; |
| } |
| |
| *rdev = input_dev; |
| return 0; |
| } |
| |
| int pcspkr_input_remove(struct input_dev *dev) |
| { |
| pcspkr_stop_sound(); |
| input_unregister_device(dev); /* this also does kfree() */ |
| |
| return 0; |
| } |