179 lines
4.0 KiB
C
179 lines
4.0 KiB
C
/*
|
|
* 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 <linux/gpio.h>
|
|
#include <mach/hardware.h>
|
|
|
|
MODULE_AUTHOR("Alessandro Zummo <a.zummo@towertech.it>");
|
|
MODULE_DESCRIPTION("ixp4xx beeper driver");
|
|
MODULE_LICENSE("GPL");
|
|
MODULE_ALIAS("platform:ixp4xx-beeper");
|
|
|
|
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_direction_output(pin, 0);
|
|
*IXP4XX_OSRT2 = (count & ~IXP4XX_OST_RELOAD_MASK) | IXP4XX_OST_ENABLE;
|
|
} else {
|
|
gpio_direction_output(pin, 1);
|
|
gpio_direction_input(pin);
|
|
*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)
|
|
count = (ixp4xx_timer_freq / (value * 4)) - 1;
|
|
|
|
ixp4xx_spkr_control(pin, count);
|
|
|
|
return 0;
|
|
}
|
|
|
|
static irqreturn_t ixp4xx_spkr_interrupt(int irq, void *dev_id)
|
|
{
|
|
unsigned int pin = (unsigned int) dev_id;
|
|
|
|
/* clear interrupt */
|
|
*IXP4XX_OSST = IXP4XX_OSST_TIMER_2_PEND;
|
|
|
|
/* flip the beeper output */
|
|
gpio_set_value(pin, !gpio_get_value(pin));
|
|
|
|
return IRQ_HANDLED;
|
|
}
|
|
|
|
static int 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 = gpio_request(dev->id, "ixp4-beeper");
|
|
if (err)
|
|
goto err_free_device;
|
|
|
|
err = request_irq(IRQ_IXP4XX_TIMER2, &ixp4xx_spkr_interrupt,
|
|
IRQF_NO_SUSPEND, "ixp4xx-beeper",
|
|
(void *) dev->id);
|
|
if (err)
|
|
goto err_free_gpio;
|
|
|
|
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, (void *)dev->id);
|
|
err_free_gpio:
|
|
gpio_free(dev->id);
|
|
err_free_device:
|
|
input_free_device(input_dev);
|
|
|
|
return err;
|
|
}
|
|
|
|
static int 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);
|
|
|
|
/* turn the speaker off */
|
|
disable_irq(IRQ_IXP4XX_TIMER2);
|
|
ixp4xx_spkr_control(pin, 0);
|
|
|
|
free_irq(IRQ_IXP4XX_TIMER2, (void *)dev->id);
|
|
gpio_free(dev->id);
|
|
|
|
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 = ixp4xx_spkr_remove,
|
|
.shutdown = ixp4xx_spkr_shutdown,
|
|
};
|
|
module_platform_driver(ixp4xx_spkr_platform_driver);
|
|
|