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c7a8be08da
This is now a very simple trigger indeed but useful in many common cases. Signed-off-by: Jonathan Cameron <jic23@kernel.org> Reviewed-by: Lars-Peter Clausen <lars@metafoo.de>
122 lines
2.8 KiB
C
122 lines
2.8 KiB
C
/*
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* Industrial I/O - generic interrupt based trigger support
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*
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* Copyright (c) 2008-2013 Jonathan Cameron
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*
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* This program is free software; you can redistribute it and/or modify it
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* under the terms of the GNU General Public License version 2 as published by
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* the Free Software Foundation.
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*/
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#include <linux/kernel.h>
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#include <linux/module.h>
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#include <linux/platform_device.h>
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#include <linux/interrupt.h>
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#include <linux/slab.h>
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#include <linux/iio/iio.h>
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#include <linux/iio/trigger.h>
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struct iio_interrupt_trigger_info {
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unsigned int irq;
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};
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static irqreturn_t iio_interrupt_trigger_poll(int irq, void *private)
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{
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/* Timestamp not currently provided */
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iio_trigger_poll(private, 0);
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return IRQ_HANDLED;
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}
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static const struct iio_trigger_ops iio_interrupt_trigger_ops = {
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.owner = THIS_MODULE,
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};
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static int iio_interrupt_trigger_probe(struct platform_device *pdev)
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{
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struct iio_interrupt_trigger_info *trig_info;
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struct iio_trigger *trig;
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unsigned long irqflags;
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struct resource *irq_res;
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int irq, ret = 0;
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irq_res = platform_get_resource(pdev, IORESOURCE_IRQ, 0);
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if (irq_res == NULL)
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return -ENODEV;
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irqflags = (irq_res->flags & IRQF_TRIGGER_MASK) | IRQF_SHARED;
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irq = irq_res->start;
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trig = iio_trigger_alloc("irqtrig%d", irq_res->start);
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if (!trig) {
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ret = -ENOMEM;
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goto error_ret;
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}
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trig_info = kzalloc(sizeof(*trig_info), GFP_KERNEL);
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if (!trig_info) {
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ret = -ENOMEM;
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goto error_put_trigger;
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}
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iio_trigger_set_drvdata(trig, trig_info);
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trig_info->irq = irq;
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trig->ops = &iio_interrupt_trigger_ops;
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ret = request_irq(irq, iio_interrupt_trigger_poll,
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irqflags, trig->name, trig);
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if (ret) {
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dev_err(&pdev->dev,
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"request IRQ-%d failed", irq);
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goto error_free_trig_info;
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}
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ret = iio_trigger_register(trig);
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if (ret)
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goto error_release_irq;
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platform_set_drvdata(pdev, trig);
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return 0;
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/* First clean up the partly allocated trigger */
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error_release_irq:
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free_irq(irq, trig);
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error_free_trig_info:
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kfree(trig_info);
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error_put_trigger:
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iio_trigger_put(trig);
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error_ret:
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return ret;
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}
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static int iio_interrupt_trigger_remove(struct platform_device *pdev)
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{
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struct iio_trigger *trig;
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struct iio_interrupt_trigger_info *trig_info;
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trig = platform_get_drvdata(pdev);
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trig_info = iio_trigger_get_drvdata(trig);
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iio_trigger_unregister(trig);
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free_irq(trig_info->irq, trig);
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kfree(trig_info);
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iio_trigger_put(trig);
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return 0;
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}
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static struct platform_driver iio_interrupt_trigger_driver = {
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.probe = iio_interrupt_trigger_probe,
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.remove = iio_interrupt_trigger_remove,
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.driver = {
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.name = "iio_interrupt_trigger",
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.owner = THIS_MODULE,
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},
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};
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module_platform_driver(iio_interrupt_trigger_driver);
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MODULE_AUTHOR("Jonathan Cameron <jic23@kernel.org>");
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MODULE_DESCRIPTION("Interrupt trigger for the iio subsystem");
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MODULE_LICENSE("GPL v2");
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