Subversion Repositories test_project

/*

 * Generic IXP4xx beeper driver

 *

 * Copyright (C) 2005 Tower Technologies

 *

 * based on nslu2-io.c

 *  Copyright (C) 2004 Karen Spearel

 *

 * Author: Alessandro Zummo <a.zummo@towertech.it>

 * Maintainers: http://www.nslu2-linux.org/

 *

 * This program is free software; you can redistribute it and/or modify

 * it under the terms of the GNU General Public License version 2 as

 * published by the Free Software Foundation.

 *

 */

#include <linux/module.h>

#include <linux/input.h>

#include <linux/delay.h>

#include <linux/platform_device.h>

#include <linux/interrupt.h>

#include <asm/hardware.h>

MODULE_AUTHOR("Alessandro Zummo <a.zummo@towertech.it>");

MODULE_DESCRIPTION("ixp4xx beeper driver");

MODULE_LICENSE("GPL");

static DEFINE_SPINLOCK(beep_lock);

static void ixp4xx_spkr_control(unsigned int pin, unsigned int count)

{

        unsigned long flags;

        spin_lock_irqsave(&beep_lock, flags);

         if (count) {

                gpio_line_config(pin, IXP4XX_GPIO_OUT);

                gpio_line_set(pin, IXP4XX_GPIO_LOW);

                *IXP4XX_OSRT2 = (count & ~IXP4XX_OST_RELOAD_MASK) | IXP4XX_OST_ENABLE;

        } else {

                gpio_line_config(pin, IXP4XX_GPIO_IN);

                gpio_line_set(pin, IXP4XX_GPIO_HIGH);

                *IXP4XX_OSRT2 = 0;

        }

        spin_unlock_irqrestore(&beep_lock, flags);

}

static int ixp4xx_spkr_event(struct input_dev *dev, unsigned int type, unsigned int code, int value)

{

        unsigned int pin = (unsigned int) input_get_drvdata(dev);

        unsigned int count = 0;

        if (type != EV_SND)

                return -1;

        switch (code) {

                case SND_BELL:

                        if (value)

                                value = 1000;

                case SND_TONE:

                        break;

                default:

                        return -1;

        }

        if (value > 20 && value < 32767)

#ifndef FREQ

                count = (ixp4xx_get_board_tick_rate() / (value * 4)) - 1;

#else

                count = (FREQ / (value * 4)) - 1;

#endif

        ixp4xx_spkr_control(pin, count);

        return 0;

}

static irqreturn_t ixp4xx_spkr_interrupt(int irq, void *dev_id)

{

        /* clear interrupt */

        *IXP4XX_OSST = IXP4XX_OSST_TIMER_2_PEND;

        /* flip the beeper output */

        *IXP4XX_GPIO_GPOUTR ^= (1 << (unsigned int) dev_id);

        return IRQ_HANDLED;

}

static int __devinit ixp4xx_spkr_probe(struct platform_device *dev)

{

        struct input_dev *input_dev;

        int err;

        input_dev = input_allocate_device();

        if (!input_dev)

                return -ENOMEM;

        input_set_drvdata(input_dev, (void *) dev->id);

        input_dev->name = "ixp4xx beeper",

        input_dev->phys = "ixp4xx/gpio";

        input_dev->id.bustype = BUS_HOST;

        input_dev->id.vendor  = 0x001f;

        input_dev->id.product = 0x0001;

        input_dev->id.version = 0x0100;

        input_dev->dev.parent = &dev->dev;

        input_dev->evbit[0] = BIT_MASK(EV_SND);

        input_dev->sndbit[0] = BIT_MASK(SND_BELL) | BIT_MASK(SND_TONE);

        input_dev->event = ixp4xx_spkr_event;

        err = request_irq(IRQ_IXP4XX_TIMER2, &ixp4xx_spkr_interrupt,

                          IRQF_DISABLED | IRQF_TIMER, "ixp4xx-beeper", (void *) dev->id);

        if (err)

                goto err_free_device;

        err = input_register_device(input_dev);

        if (err)

                goto err_free_irq;

        platform_set_drvdata(dev, input_dev);

        return 0;

 err_free_irq:

        free_irq(IRQ_IXP4XX_TIMER2, dev);

 err_free_device:

        input_free_device(input_dev);

        return err;

}

static int __devexit ixp4xx_spkr_remove(struct platform_device *dev)

{

        struct input_dev *input_dev = platform_get_drvdata(dev);

        unsigned int pin = (unsigned int) input_get_drvdata(input_dev);

        input_unregister_device(input_dev);

        platform_set_drvdata(dev, NULL);

        /* turn the speaker off */

        disable_irq(IRQ_IXP4XX_TIMER2);

        ixp4xx_spkr_control(pin, 0);

        free_irq(IRQ_IXP4XX_TIMER2, dev);

        return 0;

}

static void ixp4xx_spkr_shutdown(struct platform_device *dev)

{

        struct input_dev *input_dev = platform_get_drvdata(dev);

        unsigned int pin = (unsigned int) input_get_drvdata(input_dev);

        /* turn off the speaker */

        disable_irq(IRQ_IXP4XX_TIMER2);

        ixp4xx_spkr_control(pin, 0);

}

static struct platform_driver ixp4xx_spkr_platform_driver = {

        .driver         = {

                .name   = "ixp4xx-beeper",

                .owner  = THIS_MODULE,

        },

        .probe          = ixp4xx_spkr_probe,

        .remove         = __devexit_p(ixp4xx_spkr_remove),

        .shutdown       = ixp4xx_spkr_shutdown,

};

static int __init ixp4xx_spkr_init(void)

{

        return platform_driver_register(&ixp4xx_spkr_platform_driver);

}

static void __exit ixp4xx_spkr_exit(void)

{

        platform_driver_unregister(&ixp4xx_spkr_platform_driver);

}

module_init(ixp4xx_spkr_init);

module_exit(ixp4xx_spkr_exit);