119 lines
2.7 KiB
C
119 lines
2.7 KiB
C
|
/*
|
||
|
|
* Industrial I/O - generic interrupt based trigger support
|
||
|
|
*
|
||
|
|
* Copyright (c) 2008-2013 Jonathan Cameron
|
||
|
|
*
|
||
|
|
* 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/kernel.h>
|
||
|
|
#include <linux/module.h>
|
||
|
|
#include <linux/platform_device.h>
|
||
|
|
#include <linux/interrupt.h>
|
||
|
|
#include <linux/slab.h>
|
||
|
|
|
||
|
|
#include <linux/iio/iio.h>
|
||
|
|
#include <linux/iio/trigger.h>
|
||
|
|
|
||
|
|
|
||
|
|
struct iio_interrupt_trigger_info {
|
||
|
|
unsigned int irq;
|
||
|
|
};
|
||
|
|
|
||
|
|
static irqreturn_t iio_interrupt_trigger_poll(int irq, void *private)
|
||
|
|
{
|
||
|
|
iio_trigger_poll(private);
|
||
|
|
return IRQ_HANDLED;
|
||
|
|
}
|
||
|
|
|
||
|
|
static const struct iio_trigger_ops iio_interrupt_trigger_ops = {
|
||
|
|
};
|
||
|
|
|
||
|
|
static int iio_interrupt_trigger_probe(struct platform_device *pdev)
|
||
|
|
{
|
||
|
|
struct iio_interrupt_trigger_info *trig_info;
|
||
|
|
struct iio_trigger *trig;
|
||
|
|
unsigned long irqflags;
|
||
|
|
struct resource *irq_res;
|
||
|
|
int irq, ret = 0;
|
||
|
|
|
||
|
|
irq_res = platform_get_resource(pdev, IORESOURCE_IRQ, 0);
|
||
|
|
|
||
|
|
if (irq_res == NULL)
|
||
|
|
return -ENODEV;
|
||
|
|
|
||
|
|
irqflags = (irq_res->flags & IRQF_TRIGGER_MASK) | IRQF_SHARED;
|
||
|
|
|
||
|
|
irq = irq_res->start;
|
||
|
|
|
||
|
|
trig = iio_trigger_alloc("irqtrig%d", irq);
|
||
|
|
if (!trig) {
|
||
|
|
ret = -ENOMEM;
|
||
|
|
goto error_ret;
|
||
|
|
}
|
||
|
|
|
||
|
|
trig_info = kzalloc(sizeof(*trig_info), GFP_KERNEL);
|
||
|
|
if (!trig_info) {
|
||
|
|
ret = -ENOMEM;
|
||
|
|
goto error_free_trigger;
|
||
|
|
}
|
||
|
|
iio_trigger_set_drvdata(trig, trig_info);
|
||
|
|
trig_info->irq = irq;
|
||
|
|
trig->ops = &iio_interrupt_trigger_ops;
|
||
|
|
ret = request_irq(irq, iio_interrupt_trigger_poll,
|
||
|
|
irqflags, trig->name, trig);
|
||
|
|
if (ret) {
|
||
|
|
dev_err(&pdev->dev,
|
||
|
|
"request IRQ-%d failed", irq);
|
||
|
|
goto error_free_trig_info;
|
||
|
|
}
|
||
|
|
|
||
|
|
ret = iio_trigger_register(trig);
|
||
|
|
if (ret)
|
||
|
|
goto error_release_irq;
|
||
|
|
platform_set_drvdata(pdev, trig);
|
||
|
|
|
||
|
|
return 0;
|
||
|
|
|
||
|
|
/* First clean up the partly allocated trigger */
|
||
|
|
error_release_irq:
|
||
|
|
free_irq(irq, trig);
|
||
|
|
error_free_trig_info:
|
||
|
|
kfree(trig_info);
|
||
|
|
error_free_trigger:
|
||
|
|
iio_trigger_free(trig);
|
||
|
|
error_ret:
|
||
|
|
return ret;
|
||
|
|
}
|
||
|
|
|
||
|
|
static int iio_interrupt_trigger_remove(struct platform_device *pdev)
|
||
|
|
{
|
||
|
|
struct iio_trigger *trig;
|
||
|
|
struct iio_interrupt_trigger_info *trig_info;
|
||
|
|
|
||
|
|
trig = platform_get_drvdata(pdev);
|
||
|
|
trig_info = iio_trigger_get_drvdata(trig);
|
||
|
|
iio_trigger_unregister(trig);
|
||
|
|
free_irq(trig_info->irq, trig);
|
||
|
|
kfree(trig_info);
|
||
|
|
iio_trigger_free(trig);
|
||
|
|
|
||
|
|
return 0;
|
||
|
|
}
|
||
|
|
|
||
|
|
static struct platform_driver iio_interrupt_trigger_driver = {
|
||
|
|
.probe = iio_interrupt_trigger_probe,
|
||
|
|
.remove = iio_interrupt_trigger_remove,
|
||
|
|
.driver = {
|
||
|
|
.name = "iio_interrupt_trigger",
|
||
|
|
},
|
||
|
|
};
|
||
|
|
|
||
|
|
module_platform_driver(iio_interrupt_trigger_driver);
|
||
|
|
|
||
|
|
MODULE_AUTHOR("Jonathan Cameron <jic23@kernel.org>");
|
||
|
|
MODULE_DESCRIPTION("Interrupt trigger for the iio subsystem");
|
||
|
|
MODULE_LICENSE("GPL v2");
|