144 lines
3.7 KiB
C
144 lines
3.7 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/iio.h>
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#include <linux/iio/buffer_impl.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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struct iio_dev *indio_dev;
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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_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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cb_buff->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(cb_buff->indio_dev->masklength),
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sizeof(long), 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 != cb_buff->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->indio_dev, &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->indio_dev, NULL, &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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struct iio_dev
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*iio_channel_cb_get_iio_dev(const struct iio_cb_buffer *cb_buffer)
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{
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return cb_buffer->indio_dev;
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}
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EXPORT_SYMBOL_GPL(iio_channel_cb_get_iio_dev);
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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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