179 lines
4.0 KiB
C
179 lines
4.0 KiB
C
/*
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* Generic IXP4xx beeper driver
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*
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* Copyright (C) 2005 Tower Technologies
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*
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* based on nslu2-io.c
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* Copyright (C) 2004 Karen Spearel
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*
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* Author: Alessandro Zummo <a.zummo@towertech.it>
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* Maintainers: http://www.nslu2-linux.org/
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*
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* This program is free software; you can redistribute it and/or modify
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* it under the terms of the GNU General Public License version 2 as
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* published by the Free Software Foundation.
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*
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*/
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#include <linux/module.h>
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#include <linux/input.h>
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#include <linux/delay.h>
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#include <linux/platform_device.h>
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#include <linux/interrupt.h>
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#include <linux/gpio.h>
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#include <mach/hardware.h>
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MODULE_AUTHOR("Alessandro Zummo <a.zummo@towertech.it>");
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MODULE_DESCRIPTION("ixp4xx beeper driver");
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MODULE_LICENSE("GPL");
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MODULE_ALIAS("platform:ixp4xx-beeper");
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static DEFINE_SPINLOCK(beep_lock);
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static void ixp4xx_spkr_control(unsigned int pin, unsigned int count)
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{
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unsigned long flags;
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spin_lock_irqsave(&beep_lock, flags);
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if (count) {
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gpio_direction_output(pin, 0);
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*IXP4XX_OSRT2 = (count & ~IXP4XX_OST_RELOAD_MASK) | IXP4XX_OST_ENABLE;
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} else {
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gpio_direction_output(pin, 1);
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gpio_direction_input(pin);
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*IXP4XX_OSRT2 = 0;
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}
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spin_unlock_irqrestore(&beep_lock, flags);
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}
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static int ixp4xx_spkr_event(struct input_dev *dev, unsigned int type, unsigned int code, int value)
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{
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unsigned int pin = (unsigned int) input_get_drvdata(dev);
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unsigned int count = 0;
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if (type != EV_SND)
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return -1;
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switch (code) {
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case SND_BELL:
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if (value)
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value = 1000;
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case SND_TONE:
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break;
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default:
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return -1;
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}
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if (value > 20 && value < 32767)
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count = (IXP4XX_TIMER_FREQ / (value * 4)) - 1;
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ixp4xx_spkr_control(pin, count);
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return 0;
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}
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static irqreturn_t ixp4xx_spkr_interrupt(int irq, void *dev_id)
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{
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unsigned int pin = (unsigned int) dev_id;
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/* clear interrupt */
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*IXP4XX_OSST = IXP4XX_OSST_TIMER_2_PEND;
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/* flip the beeper output */
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gpio_set_value(pin, !gpio_get_value(pin));
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return IRQ_HANDLED;
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}
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static int ixp4xx_spkr_probe(struct platform_device *dev)
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{
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struct input_dev *input_dev;
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int err;
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input_dev = input_allocate_device();
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if (!input_dev)
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return -ENOMEM;
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input_set_drvdata(input_dev, (void *) dev->id);
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input_dev->name = "ixp4xx beeper",
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input_dev->phys = "ixp4xx/gpio";
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input_dev->id.bustype = BUS_HOST;
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input_dev->id.vendor = 0x001f;
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input_dev->id.product = 0x0001;
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input_dev->id.version = 0x0100;
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input_dev->dev.parent = &dev->dev;
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input_dev->evbit[0] = BIT_MASK(EV_SND);
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input_dev->sndbit[0] = BIT_MASK(SND_BELL) | BIT_MASK(SND_TONE);
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input_dev->event = ixp4xx_spkr_event;
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err = gpio_request(dev->id, "ixp4-beeper");
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if (err)
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goto err_free_device;
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err = request_irq(IRQ_IXP4XX_TIMER2, &ixp4xx_spkr_interrupt,
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IRQF_NO_SUSPEND, "ixp4xx-beeper",
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(void *) dev->id);
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if (err)
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goto err_free_gpio;
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err = input_register_device(input_dev);
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if (err)
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goto err_free_irq;
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platform_set_drvdata(dev, input_dev);
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return 0;
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err_free_irq:
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free_irq(IRQ_IXP4XX_TIMER2, (void *)dev->id);
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err_free_gpio:
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gpio_free(dev->id);
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err_free_device:
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input_free_device(input_dev);
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return err;
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}
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static int ixp4xx_spkr_remove(struct platform_device *dev)
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{
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struct input_dev *input_dev = platform_get_drvdata(dev);
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unsigned int pin = (unsigned int) input_get_drvdata(input_dev);
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input_unregister_device(input_dev);
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/* turn the speaker off */
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disable_irq(IRQ_IXP4XX_TIMER2);
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ixp4xx_spkr_control(pin, 0);
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free_irq(IRQ_IXP4XX_TIMER2, (void *)dev->id);
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gpio_free(dev->id);
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return 0;
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}
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static void ixp4xx_spkr_shutdown(struct platform_device *dev)
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{
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struct input_dev *input_dev = platform_get_drvdata(dev);
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unsigned int pin = (unsigned int) input_get_drvdata(input_dev);
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/* turn off the speaker */
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disable_irq(IRQ_IXP4XX_TIMER2);
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ixp4xx_spkr_control(pin, 0);
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}
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static struct platform_driver ixp4xx_spkr_platform_driver = {
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.driver = {
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.name = "ixp4xx-beeper",
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.owner = THIS_MODULE,
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},
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.probe = ixp4xx_spkr_probe,
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.remove = ixp4xx_spkr_remove,
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.shutdown = ixp4xx_spkr_shutdown,
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};
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module_platform_driver(ixp4xx_spkr_platform_driver);
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