172 lines
3.7 KiB
C
172 lines
3.7 KiB
C
/*
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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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*/
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/*
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* This program is free software; you can redistribute it and/or modify it
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* under the terms of the GNU General Public License version 2 as published by
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* the Free Software Foundation
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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/init.h>
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#include <linux/input.h>
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#include <linux/platform_device.h>
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#include <asm/8253pit.h>
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#include <asm/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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static struct platform_device *pcspkr_platform_device;
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static DEFINE_SPINLOCK(i8253_beep_lock);
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static int pcspkr_event(struct input_dev *dev, unsigned int type, 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 -1;
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switch (code) {
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case SND_BELL: if (value) value = 1000;
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case SND_TONE: break;
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default: 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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spin_lock_irqsave(&i8253_beep_lock, flags);
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if (count) {
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/* enable counter 2 */
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outb_p(inb_p(0x61) | 3, 0x61);
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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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} 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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spin_unlock_irqrestore(&i8253_beep_lock, flags);
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return 0;
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}
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static int __devinit 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->cdev.dev = &dev->dev;
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pcspkr_dev->evbit[0] = BIT(EV_SND);
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pcspkr_dev->sndbit[0] = BIT(SND_BELL) | BIT(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 __devexit 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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platform_set_drvdata(dev, NULL);
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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 platform_device *dev, pm_message_t state)
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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 struct platform_driver pcspkr_platform_driver = {
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.driver = {
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.name = "pcspkr",
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.owner = THIS_MODULE,
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},
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.probe = pcspkr_probe,
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.remove = __devexit_p(pcspkr_remove),
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.suspend = pcspkr_suspend,
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.shutdown = pcspkr_shutdown,
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};
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static int __init pcspkr_init(void)
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{
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int err;
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err = platform_driver_register(&pcspkr_platform_driver);
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if (err)
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return err;
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pcspkr_platform_device = platform_device_alloc("pcspkr", -1);
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if (!pcspkr_platform_device) {
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err = -ENOMEM;
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goto err_unregister_driver;
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}
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err = platform_device_add(pcspkr_platform_device);
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if (err)
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goto err_free_device;
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return 0;
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err_free_device:
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platform_device_put(pcspkr_platform_device);
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err_unregister_driver:
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platform_driver_unregister(&pcspkr_platform_driver);
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return err;
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}
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static void __exit pcspkr_exit(void)
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{
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platform_device_unregister(pcspkr_platform_device);
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platform_driver_unregister(&pcspkr_platform_driver);
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}
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module_init(pcspkr_init);
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module_exit(pcspkr_exit);
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