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8548a63b37
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>
138 lines
3.5 KiB
C
138 lines
3.5 KiB
C
/* The industrial I/O callback buffer
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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/module.h>
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#include <linux/slab.h>
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#include <linux/err.h>
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#include <linux/export.h>
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#include <linux/iio/buffer.h>
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#include <linux/iio/consumer.h>
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struct iio_cb_buffer {
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struct iio_buffer buffer;
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int (*cb)(const void *data, void *private);
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void *private;
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struct iio_channel *channels;
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};
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static struct iio_cb_buffer *buffer_to_cb_buffer(struct iio_buffer *buffer)
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{
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return container_of(buffer, struct iio_cb_buffer, buffer);
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}
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static int iio_buffer_cb_store_to(struct iio_buffer *buffer, const void *data)
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{
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struct iio_cb_buffer *cb_buff = buffer_to_cb_buffer(buffer);
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return cb_buff->cb(data, cb_buff->private);
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}
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static void iio_buffer_cb_release(struct iio_buffer *buffer)
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{
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struct iio_cb_buffer *cb_buff = buffer_to_cb_buffer(buffer);
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kfree(cb_buff->buffer.scan_mask);
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kfree(cb_buff);
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}
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static const struct iio_buffer_access_funcs iio_cb_access = {
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.store_to = &iio_buffer_cb_store_to,
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.release = &iio_buffer_cb_release,
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.modes = INDIO_BUFFER_SOFTWARE | INDIO_BUFFER_TRIGGERED,
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};
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struct iio_cb_buffer *iio_channel_get_all_cb(struct device *dev,
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int (*cb)(const void *data,
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void *private),
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void *private)
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{
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int ret;
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struct iio_cb_buffer *cb_buff;
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struct iio_dev *indio_dev;
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struct iio_channel *chan;
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cb_buff = kzalloc(sizeof(*cb_buff), GFP_KERNEL);
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if (cb_buff == NULL)
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return ERR_PTR(-ENOMEM);
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iio_buffer_init(&cb_buff->buffer);
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cb_buff->private = private;
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cb_buff->cb = cb;
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cb_buff->buffer.access = &iio_cb_access;
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INIT_LIST_HEAD(&cb_buff->buffer.demux_list);
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cb_buff->channels = iio_channel_get_all(dev);
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if (IS_ERR(cb_buff->channels)) {
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ret = PTR_ERR(cb_buff->channels);
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goto error_free_cb_buff;
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}
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indio_dev = cb_buff->channels[0].indio_dev;
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cb_buff->buffer.scan_mask
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= kcalloc(BITS_TO_LONGS(indio_dev->masklength), sizeof(long),
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GFP_KERNEL);
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if (cb_buff->buffer.scan_mask == NULL) {
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ret = -ENOMEM;
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goto error_release_channels;
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}
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chan = &cb_buff->channels[0];
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while (chan->indio_dev) {
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if (chan->indio_dev != indio_dev) {
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ret = -EINVAL;
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goto error_free_scan_mask;
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}
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set_bit(chan->channel->scan_index,
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cb_buff->buffer.scan_mask);
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chan++;
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}
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return cb_buff;
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error_free_scan_mask:
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kfree(cb_buff->buffer.scan_mask);
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error_release_channels:
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iio_channel_release_all(cb_buff->channels);
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error_free_cb_buff:
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kfree(cb_buff);
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return ERR_PTR(ret);
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}
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EXPORT_SYMBOL_GPL(iio_channel_get_all_cb);
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int iio_channel_start_all_cb(struct iio_cb_buffer *cb_buff)
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{
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return iio_update_buffers(cb_buff->channels[0].indio_dev,
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&cb_buff->buffer,
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NULL);
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}
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EXPORT_SYMBOL_GPL(iio_channel_start_all_cb);
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void iio_channel_stop_all_cb(struct iio_cb_buffer *cb_buff)
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{
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iio_update_buffers(cb_buff->channels[0].indio_dev,
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NULL,
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&cb_buff->buffer);
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}
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EXPORT_SYMBOL_GPL(iio_channel_stop_all_cb);
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void iio_channel_release_all_cb(struct iio_cb_buffer *cb_buff)
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{
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iio_channel_release_all(cb_buff->channels);
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iio_buffer_put(&cb_buff->buffer);
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}
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EXPORT_SYMBOL_GPL(iio_channel_release_all_cb);
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struct iio_channel
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*iio_channel_cb_get_channels(const struct iio_cb_buffer *cb_buffer)
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{
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return cb_buffer->channels;
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}
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EXPORT_SYMBOL_GPL(iio_channel_cb_get_channels);
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MODULE_AUTHOR("Jonathan Cameron <jic23@kernel.org>");
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MODULE_DESCRIPTION("Industrial I/O callback buffer");
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MODULE_LICENSE("GPL");
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