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For generic IIO trigger implementations we already have a sub-directory, but the generic buffer implementations currently reside in the IIO top-level directory. The main reason is that things have historically grown into this form. With more generic buffer implementations on its way now is the perfect time to clean this up and introduce a sub-directory for generic buffer implementations to avoid too much clutter in the top-level directory. Signed-off-by: Lars-Peter Clausen <lars@metafoo.de> Signed-off-by: Jonathan Cameron <jic23@kernel.org>
104 lines
3.0 KiB
C
104 lines
3.0 KiB
C
/*
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* Copyright (c) 2012 Analog Devices, Inc.
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* Author: Lars-Peter Clausen <lars@metafoo.de>
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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/export.h>
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#include <linux/module.h>
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#include <linux/iio/iio.h>
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#include <linux/iio/buffer.h>
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#include <linux/iio/kfifo_buf.h>
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#include <linux/iio/triggered_buffer.h>
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#include <linux/iio/trigger_consumer.h>
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static const struct iio_buffer_setup_ops iio_triggered_buffer_setup_ops = {
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.postenable = &iio_triggered_buffer_postenable,
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.predisable = &iio_triggered_buffer_predisable,
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};
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/**
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* iio_triggered_buffer_setup() - Setup triggered buffer and pollfunc
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* @indio_dev: IIO device structure
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* @h: Function which will be used as pollfunc top half
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* @thread: Function which will be used as pollfunc bottom half
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* @setup_ops: Buffer setup functions to use for this device.
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* If NULL the default setup functions for triggered
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* buffers will be used.
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*
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* This function combines some common tasks which will normally be performed
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* when setting up a triggered buffer. It will allocate the buffer and the
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* pollfunc.
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*
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* Before calling this function the indio_dev structure should already be
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* completely initialized, but not yet registered. In practice this means that
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* this function should be called right before iio_device_register().
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*
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* To free the resources allocated by this function call
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* iio_triggered_buffer_cleanup().
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*/
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int iio_triggered_buffer_setup(struct iio_dev *indio_dev,
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irqreturn_t (*h)(int irq, void *p),
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irqreturn_t (*thread)(int irq, void *p),
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const struct iio_buffer_setup_ops *setup_ops)
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{
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struct iio_buffer *buffer;
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int ret;
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buffer = iio_kfifo_allocate();
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if (!buffer) {
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ret = -ENOMEM;
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goto error_ret;
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}
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iio_device_attach_buffer(indio_dev, buffer);
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indio_dev->pollfunc = iio_alloc_pollfunc(h,
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thread,
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IRQF_ONESHOT,
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indio_dev,
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"%s_consumer%d",
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indio_dev->name,
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indio_dev->id);
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if (indio_dev->pollfunc == NULL) {
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ret = -ENOMEM;
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goto error_kfifo_free;
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}
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/* Ring buffer functions - here trigger setup related */
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if (setup_ops)
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indio_dev->setup_ops = setup_ops;
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else
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indio_dev->setup_ops = &iio_triggered_buffer_setup_ops;
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/* Flag that polled ring buffering is possible */
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indio_dev->modes |= INDIO_BUFFER_TRIGGERED;
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return 0;
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error_kfifo_free:
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iio_kfifo_free(indio_dev->buffer);
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error_ret:
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return ret;
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}
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EXPORT_SYMBOL(iio_triggered_buffer_setup);
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/**
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* iio_triggered_buffer_cleanup() - Free resources allocated by iio_triggered_buffer_setup()
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* @indio_dev: IIO device structure
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*/
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void iio_triggered_buffer_cleanup(struct iio_dev *indio_dev)
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{
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iio_dealloc_pollfunc(indio_dev->pollfunc);
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iio_kfifo_free(indio_dev->buffer);
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}
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EXPORT_SYMBOL(iio_triggered_buffer_cleanup);
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MODULE_AUTHOR("Lars-Peter Clausen <lars@metafoo.de>");
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MODULE_DESCRIPTION("IIO helper functions for setting up triggered buffers");
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MODULE_LICENSE("GPL");
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