mirror of
https://github.com/AuxXxilium/linux_dsm_epyc7002.git
synced 2024-12-05 08:07:10 +07:00
23f2d735a9
Add a helper function for executing the common tasks which are usually involved in setting up a simple software ringbuffer. It will allocate the buffer, allocate the pollfunc and register the buffer. Signed-off-by: Lars-Peter Clausen <lars@metafoo.de> Acked-by: Jonathan Cameron <jic23@kernel.org> Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
111 lines
3.3 KiB
C
111 lines
3.3 KiB
C
/*
|
|
* Copyright (c) 2012 Analog Devices, Inc.
|
|
* Author: Lars-Peter Clausen <lars@metafoo.de>
|
|
*
|
|
* 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/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 = {
|
|
.preenable = &iio_sw_buffer_preenable,
|
|
.postenable = &iio_triggered_buffer_postenable,
|
|
.predisable = &iio_triggered_buffer_predisable,
|
|
};
|
|
|
|
/**
|
|
* iio_triggered_buffer_setup() - Setup triggered buffer and pollfunc
|
|
* @indio_dev: IIO device structure
|
|
* @pollfunc_bh: Function which will be used as pollfunc bottom half
|
|
* @pollfunc_th: Function which will be used as pollfunc top 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, as well as register the buffer with the IIO core.
|
|
*
|
|
* 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 (*pollfunc_bh)(int irq, void *p),
|
|
irqreturn_t (*pollfunc_th)(int irq, void *p),
|
|
const struct iio_buffer_setup_ops *setup_ops)
|
|
{
|
|
int ret;
|
|
|
|
indio_dev->buffer = iio_kfifo_allocate(indio_dev);
|
|
if (!indio_dev->buffer) {
|
|
ret = -ENOMEM;
|
|
goto error_ret;
|
|
}
|
|
|
|
indio_dev->pollfunc = iio_alloc_pollfunc(pollfunc_bh,
|
|
pollfunc_th,
|
|
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;
|
|
|
|
ret = iio_buffer_register(indio_dev,
|
|
indio_dev->channels,
|
|
indio_dev->num_channels);
|
|
if (ret)
|
|
goto error_dealloc_pollfunc;
|
|
|
|
return 0;
|
|
|
|
error_dealloc_pollfunc:
|
|
iio_dealloc_pollfunc(indio_dev->pollfunc);
|
|
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_buffer_unregister(indio_dev);
|
|
iio_dealloc_pollfunc(indio_dev->pollfunc);
|
|
iio_kfifo_free(indio_dev->buffer);
|
|
}
|
|
EXPORT_SYMBOL(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");
|