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#ifndef FREQ
  73                count = (ixp4xx_get_board_tick_rate() / (value * 4)) - 1;
  74#else
  75                count = (FREQ / (value * 4)) - 1;
  76#endif
  77
  78        ixp4xx_spkr_control(pin, count);
  79
  80        return 0;
  81}
  82
  83static irqreturn_t ixp4xx_spkr_interrupt(int irq, void *dev_id)
  84{
  85        /* clear interrupt */
  86        *IXP4XX_OSST = IXP4XX_OSST_TIMER_2_PEND;
  87
  88        /* flip the beeper output */
  89        *IXP4XX_GPIO_GPOUTR ^= (1 << (unsigned int) dev_id);
  90
  91        return IRQ_HANDLED;
  92}
  93
  94static int __devinit ixp4xx_spkr_probe(struct platform_device *dev)
  95{
  96        struct input_dev *input_dev;
  97        int err;
  98
  99        input_dev = input_allocate_device();
 100        if (!input_dev)
 101                return -ENOMEM;
 102
 103        input_set_drvdata(input_dev, (void *) dev->id);
 104
 105        input_dev->name = "ixp4xx beeper",
 106        input_dev->phys = "ixp4xx/gpio";
 107        input_dev->id.bustype = BUS_HOST;
 108        input_dev->id.vendor  = 0x001f;
 109        input_dev->id.product = 0x0001;
 110        input_dev->id.version = 0x0100;
 111        input_dev->dev.parent = &dev->dev;
 112
 113        input_dev->evbit[0] = BIT_MASK(EV_SND);
 114        input_dev->sndbit[0] = BIT_MASK(SND_BELL) | BIT_MASK(SND_TONE);
 115        input_dev->event = ixp4xx_spkr_event;
 116
 117        err = request_irq(IRQ_IXP4XX_TIMER2, &ixp4xx_spkr_interrupt,
 118                          IRQF_DISABLED | IRQF_TIMER, "ixp4xx-beeper", (void *) dev->id);
 119        if (err)
 120                goto err_free_device;
 121
 122        err = input_register_device(input_dev);
 123        if (err)
 124                goto err_free_irq;
 125
 126        platform_set_drvdata(dev, input_dev);
 127
 128        return 0;
 129
 130 err_free_irq:
 131        free_irq(IRQ_IXP4XX_TIMER2, dev);
 132 err_free_device:
 133        input_free_device(input_dev);
 134
 135        return err;
 136}
 137
 138static int __devexit ixp4xx_spkr_remove(struct platform_device *dev)
 139{
 140        struct input_dev *input_dev = platform_get_drvdata(dev);
 141        unsigned int pin = (unsigned int) input_get_drvdata(input_dev);
 142
 143        input_unregister_device(input_dev);
 144        platform_set_drvdata(dev, NULL);
 145
 146        /* turn the speaker off */
 147        disable_irq(IRQ_IXP4XX_TIMER2);
 148        ixp4xx_spkr_control(pin, 0);
 149
 150        free_irq(IRQ_IXP4XX_TIMER2, dev);
 151
 152        return 0;
 153}
 154
 155static void ixp4xx_spkr_shutdown(struct platform_device *dev)
 156{
 157        struct input_dev *input_dev = platform_get_drvdata(dev);
 158        unsigned int pin = (unsigned int) input_get_drvdata(input_dev);
 159
 160        /* turn off the speaker */
 161        disable_irq(IRQ_IXP4XX_TIMER2);
 162        ixp4xx_spkr_control(pin, 0);
 163}
 164
 165static struct platform_driver ixp4xx_spkr_platform_driver = {
 166        .driver         = {
 167                .name   = "ixp4xx-beeper",
 168                .owner  = THIS_MODULE,
 169        },
 170        .probe          = ixp4xx_spkr_probe,
 171        .remove         = __devexit_p(ixp4xx_spkr_remove),
 172        .shutdown       = ixp4xx_spkr_shutdown,
 173};
 174
 175static int __init ixp4xx_spkr_init(void)
 176{
 177        return platform_driver_register(&ixp4xx_spkr_platform_driver);
 178}
 179
 180static void __exit ixp4xx_spkr_exit(void)
 181{
 182        platform_driver_unregister(&ixp4xx_spkr_platform_driver);
 183}
 184
 185module_init(ixp4xx_spkr_init);
 186module_exit(ixp4xx_spkr_exit);
 187