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136 lines
2.8 KiB
136 lines
2.8 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/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 <[email protected]>"); |
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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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