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210ddfefcf
Any command/data coming from host will be placed in from_host queue, and the interrupt handler returns immediately. The i8042_command_task() will handle them later. Data reply to the host will be protected by the mutex. BUG=chrome-os-partner:10090 TEST=randomly play around on the link board. Change-Id: Ic19d5abd1abf8dc261ddaad4224cd9305c2f36a4 Signed-off-by: Louis Yung-Chieh Lo <yjlou@chromium.org> Reviewed-on: https://gerrit.chromium.org/gerrit/24299 Commit-Ready: Yung-Chieh Lo <yjlou%chromium.org@gtempaccount.com> Reviewed-by: Yung-Chieh Lo <yjlou%chromium.org@gtempaccount.com> Tested-by: Yung-Chieh Lo <yjlou%chromium.org@gtempaccount.com>
41 lines
1.0 KiB
C
41 lines
1.0 KiB
C
/* Copyright (c) 2012 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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* Queue data structure.
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*/
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#include "common.h"
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/* Generic queue container.
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*
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* head: next to dequeqe
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* tail: next to enqueue
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*
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* Empty:
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* head == tail
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* Full:
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* ((tail + 1) % buf_bytes) == head
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*/
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struct queue {
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int head, tail;
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int buf_bytes; /* size of buffer (in byte) */
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int unit_bytes; /* size of unit (in byte) */
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uint8_t *buf;
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};
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/* Reset the queue to empty state. */
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void queue_reset(struct queue *queue);
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/* Return TRUE if the queue is empty. */
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int queue_is_empty(const struct queue *q);
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/* Return TRUE if the queue has at least one unit space. */
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int queue_has_space(const struct queue *q, int unit_count);
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/* Add multiple units into queue. */
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void queue_add_units(struct queue *q, const void *src, int unit_count);
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/* Remove one unit from the begin of the queue. */
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int queue_remove_unit(struct queue *q, void *dest);
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