LXR linux/drivers/input/misc/ixp4xx-beeper.c

   1/*
   2 * Generic IXP4xx beeper driver
   3 *
   4 * Copyright (C) 2005 Tower Technologies
   5 *
   6 * based on nslu2-io.c
   7 *  Copyright (C) 2004 Karen Spearel
   8 *
   9 * Author: Alessandro Zummo <a.zummo@towertech.it>
  10 * Maintainers: http://www.nslu2-linux.org/
  11 *
  12 * This program is free software; you can redistribute it and/or modify
  13 * it under the terms of the GNU General Public License version 2 as
  14 * published by the Free Software Foundation.
  15 *
  16 */
  17
  18#include <linux/module.h>
  19#include <linux/input.h>
  20#include <linux/delay.h>
  21#include <linux/platform_device.h>
  22#include <linux/interrupt.h>
  23#include <mach/hardware.h>
  24
  25MODULE_AUTHOR("Alessandro Zummo <a.zummo@towertech.it>");
  26MODULE_DESCRIPTION("ixp4xx beeper driver");
  27MODULE_LICENSE("GPL");
  28MODULE_ALIAS("platform:ixp4xx-beeper");
  29
  30static DEFINE_SPINLOCK(beep_lock);
  31
  32static void ixp4xx_spkr_control(unsigned int pin, unsigned int count)
  33{
  34        unsigned long flags;
  35
  36        spin_lock_irqsave(&beep_lock, flags);
  37
  38         if (count) {
  39                gpio_line_config(pin, IXP4XX_GPIO_OUT);
  40                gpio_line_set(pin, IXP4XX_GPIO_LOW);
  41
  42                *IXP4XX_OSRT2 = (count & ~IXP4XX_OST_RELOAD_MASK) | IXP4XX_OST_ENABLE;
  43        } else {
  44                gpio_line_config(pin, IXP4XX_GPIO_IN);
  45                gpio_line_set(pin, IXP4XX_GPIO_HIGH);
  46
  47                *IXP4XX_OSRT2 = 0;
  48        }
  49
  50        spin_unlock_irqrestore(&beep_lock, flags);
  51}
  52
  53static int ixp4xx_spkr_event(struct input_dev *dev, unsigned int type, unsigned int code, int value)
  54{
  55        unsigned int pin = (unsigned int) input_get_drvdata(dev);
  56        unsigned int count = 0;
  57
  58        if (type != EV_SND)
  59                return -1;
  60
  61        switch (code) {
  62                case SND_BELL:
  63                        if (value)
  64                                value = 1000;
  65                case SND_TONE:
  66                        break;
  67                default:
  68                        return -1;
  69        }
  70
  71        if (value > 20 && value < 32767)
  72                count = (IXP4XX_TIMER_FREQ / (value * 4)) - 1;
  73
  74        ixp4xx_spkr_control(pin, count);
  75
  76        return 0;
  77}
  78
  79static irqreturn_t ixp4xx_spkr_interrupt(int irq, void *dev_id)
  80{
  81        /* clear interrupt */
  82        *IXP4XX_OSST = IXP4XX_OSST_TIMER_2_PEND;
  83
  84        /* flip the beeper output */
  85        *IXP4XX_GPIO_GPOUTR ^= (1 << (unsigned int) dev_id);
  86
  87        return IRQ_HANDLED;
  88}
  89
  90static int __devinit ixp4xx_spkr_probe(struct platform_device *dev)
  91{
  92        struct input_dev *input_dev;
  93        int err;
  94
  95        input_dev = input_allocate_device();
  96        if (!input_dev)
  97                return -ENOMEM;
  98
  99        input_set_drvdata(input_dev, (void *) dev->id);
 100
 101        input_dev->name = "ixp4xx beeper",
 102        input_dev->phys = "ixp4xx/gpio";
 103        input_dev->id.bustype = BUS_HOST;
 104        input_dev->id.vendor  = 0x001f;
 105        input_dev->id.product = 0x0001;
 106        input_dev->id.version = 0x0100;
 107        input_dev->dev.parent = &dev->dev;
 108
 109        input_dev->evbit[0] = BIT_MASK(EV_SND);
 110        input_dev->sndbit[0] = BIT_MASK(SND_BELL) | BIT_MASK(SND_TONE);
 111        input_dev->event = ixp4xx_spkr_event;
 112
 113        err = request_irq(IRQ_IXP4XX_TIMER2, &ixp4xx_spkr_interrupt,
 114                          IRQF_DISABLED | IRQF_NO_SUSPEND, "ixp4xx-beeper",
 115                          (void *) dev->id);
 116        if (err)
 117                goto err_free_device;
 118
 119        err = input_register_device(input_dev);
 120        if (err)
 121                goto err_free_irq;
 122
 123        platform_set_drvdata(dev, input_dev);
 124
 125        return 0;
 126
 127 err_free_irq:
 128        free_irq(IRQ_IXP4XX_TIMER2, dev);
 129 err_free_device:
 130        input_free_device(input_dev);
 131
 132        return err;
 133}
 134
 135static int __devexit ixp4xx_spkr_remove(struct platform_device *dev)
 136{
 137        struct input_dev *input_dev = platform_get_drvdata(dev);
 138        unsigned int pin = (unsigned int) input_get_drvdata(input_dev);
 139
 140        input_unregister_device(input_dev);
 141        platform_set_drvdata(dev, NULL);
 142
 143        /* turn the speaker off */
 144        disable_irq(IRQ_IXP4XX_TIMER2);
 145        ixp4xx_spkr_control(pin, 0);
 146
 147        free_irq(IRQ_IXP4XX_TIMER2, dev);
 148
 149        return 0;
 150}
 151
 152static void ixp4xx_spkr_shutdown(struct platform_device *dev)
 153{
 154        struct input_dev *input_dev = platform_get_drvdata(dev);
 155        unsigned int pin = (unsigned int) input_get_drvdata(input_dev);
 156
 157        /* turn off the speaker */
 158        disable_irq(IRQ_IXP4XX_TIMER2);
 159        ixp4xx_spkr_control(pin, 0);
 160}
 161
 162static struct platform_driver ixp4xx_spkr_platform_driver = {
 163        .driver         = {
 164                .name   = "ixp4xx-beeper",
 165                .owner  = THIS_MODULE,
 166        },
 167        .probe          = ixp4xx_spkr_probe,
 168        .remove         = __devexit_p(ixp4xx_spkr_remove),
 169        .shutdown       = ixp4xx_spkr_shutdown,
 170};
 171
 172static int __init ixp4xx_spkr_init(void)
 173{
 174        return platform_driver_register(&ixp4xx_spkr_platform_driver);
 175}
 176
 177static void __exit ixp4xx_spkr_exit(void)
 178{
 179        platform_driver_unregister(&ixp4xx_spkr_platform_driver);
 180}
 181
 182module_init(ixp4xx_spkr_init);
 183module_exit(ixp4xx_spkr_exit);
 184