137 строки
2.8 KiB
C
137 строки
2.8 KiB
C
// 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/kernel.h>
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#include <linux/module.h>
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#include <linux/i8253.h>
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#include <linux/input.h>
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#include <linux/platform_device.h>
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#include <linux/timex.h>
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#include <linux/io.h>
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MODULE_AUTHOR("Vojtech Pavlik <vojtech@ucw.cz>");
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MODULE_DESCRIPTION("PC Speaker beeper driver");
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MODULE_LICENSE("GPL");
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MODULE_ALIAS("platform:pcspkr");
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static int pcspkr_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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unsigned long flags;
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if (type != EV_SND)
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return -EINVAL;
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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 -EINVAL;
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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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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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return 0;
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}
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static int pcspkr_probe(struct platform_device *dev)
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{
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struct input_dev *pcspkr_dev;
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int err;
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pcspkr_dev = input_allocate_device();
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if (!pcspkr_dev)
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return -ENOMEM;
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pcspkr_dev->name = "PC Speaker";
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pcspkr_dev->phys = "isa0061/input0";
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pcspkr_dev->id.bustype = BUS_ISA;
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pcspkr_dev->id.vendor = 0x001f;
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pcspkr_dev->id.product = 0x0001;
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pcspkr_dev->id.version = 0x0100;
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pcspkr_dev->dev.parent = &dev->dev;
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pcspkr_dev->evbit[0] = BIT_MASK(EV_SND);
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pcspkr_dev->sndbit[0] = BIT_MASK(SND_BELL) | BIT_MASK(SND_TONE);
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pcspkr_dev->event = pcspkr_event;
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err = input_register_device(pcspkr_dev);
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if (err) {
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input_free_device(pcspkr_dev);
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return err;
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}
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platform_set_drvdata(dev, pcspkr_dev);
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return 0;
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}
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static int pcspkr_remove(struct platform_device *dev)
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{
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struct input_dev *pcspkr_dev = platform_get_drvdata(dev);
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input_unregister_device(pcspkr_dev);
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/* turn off the speaker */
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pcspkr_event(NULL, EV_SND, SND_BELL, 0);
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return 0;
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}
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static int pcspkr_suspend(struct device *dev)
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{
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pcspkr_event(NULL, EV_SND, SND_BELL, 0);
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return 0;
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}
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static void pcspkr_shutdown(struct platform_device *dev)
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{
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/* turn off the speaker */
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pcspkr_event(NULL, EV_SND, SND_BELL, 0);
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}
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static const struct dev_pm_ops pcspkr_pm_ops = {
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.suspend = pcspkr_suspend,
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};
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static struct platform_driver pcspkr_platform_driver = {
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.driver = {
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.name = "pcspkr",
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.pm = &pcspkr_pm_ops,
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},
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.probe = pcspkr_probe,
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.remove = pcspkr_remove,
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.shutdown = pcspkr_shutdown,
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};
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module_platform_driver(pcspkr_platform_driver);
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