Commit 01387959 authored by Alessandro Zummo's avatar Alessandro Zummo Committed by Dmitry Torokhov
Browse files

Input: add ixp4xx beeper driver



This is a driver for beeper found in LinkSys NSLU2 boxes. It should work
on any ixp4xx based platform.
Signed-off-by: default avatarAlessandro Zummo <a.zummo@towertech.it>
Signed-off-by: default avatarDmitry Torokhov <dtor@mail.ru>
parent 3ee68c4a
......@@ -50,6 +50,18 @@ config INPUT_WISTRON_BTNS
To compile this driver as a module, choose M here: the module will
be called wistron_btns.
config INPUT_IXP4XX_BEEPER
tristate "IXP4XX Beeper support"
depends on ARCH_IXP4XX
help
If you say yes here, you can connect a beeper to the
ixp4xx gpio pins. This is used by the LinkSys NSLU2.
If unsure, say Y.
To compile this driver as a module, choose M here: the
module will be called ixp4xx-beeper.
config INPUT_UINPUT
tristate "User level driver support"
help
......
......@@ -11,3 +11,4 @@ obj-$(CONFIG_INPUT_98SPKR) += 98spkr.o
obj-$(CONFIG_INPUT_UINPUT) += uinput.o
obj-$(CONFIG_INPUT_WISTRON_BTNS) += wistron_btns.o
obj-$(CONFIG_HP_SDC_RTC) += hp_sdc_rtc.o
obj-$(CONFIG_INPUT_IXP4XX_BEEPER) += ixp4xx-beeper.o
/*
* 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 <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) dev->private;
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, struct pt_regs *regs)
{
/* 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_dev->private = (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->cdev.dev = &dev->dev;
input_dev->evbit[0] = BIT(EV_SND);
input_dev->sndbit[0] = BIT(SND_BELL) | BIT(SND_TONE);
input_dev->event = ixp4xx_spkr_event;
err = request_irq(IRQ_IXP4XX_TIMER2, &ixp4xx_spkr_interrupt,
SA_INTERRUPT | SA_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_dev->private;
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_dev->private;
/* 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);
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