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183 lines
3.9 KiB
183 lines
3.9 KiB
// SPDX-License-Identifier: GPL-2.0-only |
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/* |
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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 <[email protected]> |
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* Maintainers: http://www.nslu2-linux.org/ |
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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 <[email protected]>"); |
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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 int ixp4xx_timer2_irq; |
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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 irq; |
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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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irq = platform_get_irq(dev, 0); |
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if (irq < 0) { |
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err = irq; |
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goto err_free_device; |
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} |
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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_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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ixp4xx_timer2_irq = irq; |
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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, (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(ixp4xx_timer2_irq); |
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ixp4xx_spkr_control(pin, 0); |
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free_irq(ixp4xx_timer2_irq, (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(ixp4xx_timer2_irq); |
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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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}, |
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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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