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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>
54 lines
1.1 KiB
C
54 lines
1.1 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 implementation.
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*/
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#include "queue.h"
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#include "util.h"
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void queue_reset(struct queue *queue)
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{
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queue->head = queue->tail = 0;
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}
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int queue_is_empty(const struct queue *q)
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{
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return q->head == q->tail;
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}
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int queue_has_space(const struct queue *q, int unit_count)
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{
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return (q->tail + unit_count * q->unit_bytes) <=
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(q->head + q->buf_bytes - q->unit_bytes);
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}
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void queue_add_units(struct queue *q, const void *src, int unit_count)
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{
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const uint8_t *s = (const uint8_t *)src;
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if (!queue_has_space(q, unit_count))
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return;
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for (unit_count *= q->unit_bytes; unit_count; unit_count--) {
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q->buf[q->tail++] = *(s++);
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q->tail %= q->buf_bytes;
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}
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}
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int queue_remove_unit(struct queue *q, void *dest)
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{
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int count;
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uint8_t *d = (uint8_t *)dest;
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if (queue_is_empty(q))
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return 0;
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for (count = q->unit_bytes; count; count--) {
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*(d++) = q->buf[q->head++];
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q->head %= q->buf_bytes;
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}
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return 1;
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}
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