mirror of
https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git
synced 2024-09-29 22:02:02 +00:00
2d32392751
The IIO core handles a trigger ops with all NULL callbacks the same as if the trigger ops itself was NULL. Remove the empty trigger ops from the interrupt trigger driver to slightly reduce the boilerplate code. Object size of the driver module is also slightly reduced. Signed-off-by: Lars-Peter Clausen <lars@metafoo.de> Link: https://lore.kernel.org/r/20211031142130.20791-1-lars@metafoo.de Signed-off-by: Jonathan Cameron <Jonathan.Cameron@huawei.com>
111 lines
2.4 KiB
C
111 lines
2.4 KiB
C
// SPDX-License-Identifier: GPL-2.0-only
|
|
/*
|
|
* Industrial I/O - generic interrupt based trigger support
|
|
*
|
|
* Copyright (c) 2008-2013 Jonathan Cameron
|
|
*/
|
|
|
|
#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 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(NULL, "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;
|
|
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");
|