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271bc1eae6
These interfaces will be used by USART, USB and I2C stream drivers to provide a uniform interface for console mux'ing code. Signed-off-by: Anton Staaf <robotboy@chromium.org> BRANCH=None BUG=None TEST=make buildall -j Change-Id: If8938512c29708f7b8c28f6ca1c707aa6b5c1708 Reviewed-on: https://chromium-review.googlesource.com/216001 Reviewed-by: Randall Spangler <rspangler@chromium.org> Commit-Queue: Anton Staaf <robotboy@chromium.org> Tested-by: Anton Staaf <robotboy@chromium.org>
55 lines
1.6 KiB
C
55 lines
1.6 KiB
C
/* Copyright (c) 2014 The Chromium OS Authors. All rights reserved.
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* Use of this source code is governed by a BSD-style license that can be
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* found in the LICENSE file.
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*/
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#ifndef INCLUDE_IN_STREAM_H
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#define INCLUDE_IN_STREAM_H
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#include <stddef.h>
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#include <stdint.h>
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struct in_stream;
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struct in_stream_ops {
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/*
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* Read at most count characters from the input stream into the user
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* buffer provided. Return the number of characters actually read
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* into the buffer.
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*/
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size_t (*read)(struct in_stream const *stream,
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uint8_t *buffer,
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size_t count);
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};
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struct in_stream {
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/*
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* Ready will be called by the stream every time new characters are
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* added to the stream. This may be called from an interrupt context
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* so work done by the ready callback should be minimal. Likely this
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* callback will be used to call task_wake, or some similar signaling
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* mechanism.
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*
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* This callback is part of the user configuration of a stream, and not
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* a stream manipulation function (in_stream_ops). That means that
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* each stream can be configured with its own ready callback.
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*
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* If no callback functionality is required ready can be specified as
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* NULL.
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*/
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void (*ready)(struct in_stream const *stream);
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struct in_stream_ops const *ops;
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};
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/*
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* Helper functions that call the associated stream operation and pass it the
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* given stream. These help prevent mistakes where one stream is passed to
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* another stream's functions.
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*/
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size_t in_stream_read(struct in_stream const *stream,
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uint8_t *buffer,
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size_t count);
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void in_stream_ready(struct in_stream const *stream);
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#endif /* INCLUDE_IN_STREAM_H */
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