mirror of https://gitee.com/openkylin/linux.git
143 lines
3.9 KiB
C
143 lines
3.9 KiB
C
// SPDX-License-Identifier: GPL-2.0-only
|
|
/*
|
|
* Copyright (c) 2012 Analog Devices, Inc.
|
|
* Author: Lars-Peter Clausen <lars@metafoo.de>
|
|
*/
|
|
|
|
#include <linux/kernel.h>
|
|
#include <linux/export.h>
|
|
#include <linux/module.h>
|
|
#include <linux/iio/iio.h>
|
|
#include <linux/iio/buffer.h>
|
|
#include <linux/iio/kfifo_buf.h>
|
|
#include <linux/iio/triggered_buffer.h>
|
|
#include <linux/iio/trigger_consumer.h>
|
|
|
|
static const struct iio_buffer_setup_ops iio_triggered_buffer_setup_ops = {
|
|
.postenable = &iio_triggered_buffer_postenable,
|
|
.predisable = &iio_triggered_buffer_predisable,
|
|
};
|
|
|
|
/**
|
|
* iio_triggered_buffer_setup() - Setup triggered buffer and pollfunc
|
|
* @indio_dev: IIO device structure
|
|
* @h: Function which will be used as pollfunc top half
|
|
* @thread: Function which will be used as pollfunc bottom half
|
|
* @setup_ops: Buffer setup functions to use for this device.
|
|
* If NULL the default setup functions for triggered
|
|
* buffers will be used.
|
|
*
|
|
* This function combines some common tasks which will normally be performed
|
|
* when setting up a triggered buffer. It will allocate the buffer and the
|
|
* pollfunc.
|
|
*
|
|
* Before calling this function the indio_dev structure should already be
|
|
* completely initialized, but not yet registered. In practice this means that
|
|
* this function should be called right before iio_device_register().
|
|
*
|
|
* To free the resources allocated by this function call
|
|
* iio_triggered_buffer_cleanup().
|
|
*/
|
|
int iio_triggered_buffer_setup(struct iio_dev *indio_dev,
|
|
irqreturn_t (*h)(int irq, void *p),
|
|
irqreturn_t (*thread)(int irq, void *p),
|
|
const struct iio_buffer_setup_ops *setup_ops)
|
|
{
|
|
struct iio_buffer *buffer;
|
|
int ret;
|
|
|
|
buffer = iio_kfifo_allocate();
|
|
if (!buffer) {
|
|
ret = -ENOMEM;
|
|
goto error_ret;
|
|
}
|
|
|
|
iio_device_attach_buffer(indio_dev, buffer);
|
|
|
|
indio_dev->pollfunc = iio_alloc_pollfunc(h,
|
|
thread,
|
|
IRQF_ONESHOT,
|
|
indio_dev,
|
|
"%s_consumer%d",
|
|
indio_dev->name,
|
|
indio_dev->id);
|
|
if (indio_dev->pollfunc == NULL) {
|
|
ret = -ENOMEM;
|
|
goto error_kfifo_free;
|
|
}
|
|
|
|
/* Ring buffer functions - here trigger setup related */
|
|
if (setup_ops)
|
|
indio_dev->setup_ops = setup_ops;
|
|
else
|
|
indio_dev->setup_ops = &iio_triggered_buffer_setup_ops;
|
|
|
|
/* Flag that polled ring buffering is possible */
|
|
indio_dev->modes |= INDIO_BUFFER_TRIGGERED;
|
|
|
|
return 0;
|
|
|
|
error_kfifo_free:
|
|
iio_kfifo_free(indio_dev->buffer);
|
|
error_ret:
|
|
return ret;
|
|
}
|
|
EXPORT_SYMBOL(iio_triggered_buffer_setup);
|
|
|
|
/**
|
|
* iio_triggered_buffer_cleanup() - Free resources allocated by iio_triggered_buffer_setup()
|
|
* @indio_dev: IIO device structure
|
|
*/
|
|
void iio_triggered_buffer_cleanup(struct iio_dev *indio_dev)
|
|
{
|
|
iio_dealloc_pollfunc(indio_dev->pollfunc);
|
|
iio_kfifo_free(indio_dev->buffer);
|
|
}
|
|
EXPORT_SYMBOL(iio_triggered_buffer_cleanup);
|
|
|
|
static void devm_iio_triggered_buffer_clean(struct device *dev, void *res)
|
|
{
|
|
iio_triggered_buffer_cleanup(*(struct iio_dev **)res);
|
|
}
|
|
|
|
int devm_iio_triggered_buffer_setup(struct device *dev,
|
|
struct iio_dev *indio_dev,
|
|
irqreturn_t (*h)(int irq, void *p),
|
|
irqreturn_t (*thread)(int irq, void *p),
|
|
const struct iio_buffer_setup_ops *ops)
|
|
{
|
|
struct iio_dev **ptr;
|
|
int ret;
|
|
|
|
ptr = devres_alloc(devm_iio_triggered_buffer_clean, sizeof(*ptr),
|
|
GFP_KERNEL);
|
|
if (!ptr)
|
|
return -ENOMEM;
|
|
|
|
*ptr = indio_dev;
|
|
|
|
ret = iio_triggered_buffer_setup(indio_dev, h, thread, ops);
|
|
if (!ret)
|
|
devres_add(dev, ptr);
|
|
else
|
|
devres_free(ptr);
|
|
|
|
return ret;
|
|
}
|
|
EXPORT_SYMBOL_GPL(devm_iio_triggered_buffer_setup);
|
|
|
|
void devm_iio_triggered_buffer_cleanup(struct device *dev,
|
|
struct iio_dev *indio_dev)
|
|
{
|
|
int rc;
|
|
|
|
rc = devres_release(dev, devm_iio_triggered_buffer_clean,
|
|
devm_iio_device_match, indio_dev);
|
|
WARN_ON(rc);
|
|
}
|
|
EXPORT_SYMBOL_GPL(devm_iio_triggered_buffer_cleanup);
|
|
|
|
MODULE_AUTHOR("Lars-Peter Clausen <lars@metafoo.de>");
|
|
MODULE_DESCRIPTION("IIO helper functions for setting up triggered buffers");
|
|
MODULE_LICENSE("GPL");
|