b22973d0ec
Request and free the GPIO line used for the beeper properly. Then use the gpiolib API to flip the output of the GPIO pin instead of relying on hacks to poke the register bits. Cc: Imre Kaloz <kaloz@openwrt.org> Cc: Alexandre Courbot <acourbot@nvidia.com> Acked-by: Dmitry Torokhov <dmitry.torokhov@gmail.com> Acked-by: Arnd Bergmann <arnd@arndb.de> Acked-by: Krzysztof Halasa <khc@pm.waw.pl> Signed-off-by: Linus Walleij <linus.walleij@linaro.org>
179 lines
4 KiB
C
179 lines
4 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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