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