344c8be049
Signed-off-by: wangbowen6 <wangbowen6@xiaomi.com>
449 lines
12 KiB
C
449 lines
12 KiB
C
/****************************************************************************
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* graphics/nxterm/nxterm_kbdin.c
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*
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* Licensed to the Apache Software Foundation (ASF) under one or more
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* contributor license agreements. See the NOTICE file distributed with
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* this work for additional information regarding copyright ownership. The
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* ASF licenses this file to you under the Apache License, Version 2.0 (the
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* "License"); you may not use this file except in compliance with the
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* License. You may obtain a copy of the License at
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*
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* http://www.apache.org/licenses/LICENSE-2.0
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*
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* Unless required by applicable law or agreed to in writing, software
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* distributed under the License is distributed on an "AS IS" BASIS, WITHOUT
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* WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. See the
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* License for the specific language governing permissions and limitations
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* under the License.
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*
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****************************************************************************/
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/****************************************************************************
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* Included Files
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****************************************************************************/
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#include <nuttx/config.h>
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#include <inttypes.h>
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#include <fcntl.h>
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#include <sched.h>
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#include <assert.h>
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#include <poll.h>
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#include <errno.h>
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#include <debug.h>
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#include <nuttx/irq.h>
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#include "nxterm.h"
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#ifdef CONFIG_NXTERM_NXKBDIN
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/****************************************************************************
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* Private Functions
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****************************************************************************/
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/****************************************************************************
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* Name: nxterm_pollnotify
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****************************************************************************/
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static void nxterm_pollnotify(FAR struct nxterm_state_s *priv,
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pollevent_t eventset)
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{
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irqstate_t flags;
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int i;
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/* This function may be called from an interrupt handler */
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for (i = 0; i < CONFIG_NXTERM_NPOLLWAITERS; i++)
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{
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flags = enter_critical_section();
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poll_notify(&priv->fds[i], 1, eventset);
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leave_critical_section(flags);
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}
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}
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/****************************************************************************
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* Public Functions
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****************************************************************************/
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/****************************************************************************
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* Name: nxterm_read
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*
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* Description:
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* The optional NxTerm read method
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*
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****************************************************************************/
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ssize_t nxterm_read(FAR struct file *filep, FAR char *buffer, size_t len)
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{
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FAR struct nxterm_state_s *priv;
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ssize_t nread;
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char ch;
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int ret;
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/* Recover our private state structure */
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DEBUGASSERT(filep && filep->f_priv);
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priv = (FAR struct nxterm_state_s *)filep->f_priv;
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/* Get exclusive access to the driver structure */
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ret = nxterm_semwait(priv);
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if (ret < 0)
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{
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gerr("ERROR: nxterm_semwait failed\n");
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return ret;
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}
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/* Loop until something is read */
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for (nread = 0; nread < len; )
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{
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/* Get the next byte from the buffer */
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if (priv->head == priv->tail)
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{
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/* The circular buffer is empty. Did we read anything? */
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if (nread > 0)
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{
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/* Yes.. break out to return what we have. */
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break;
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}
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/* If the driver was opened with O_NONBLOCK option, then
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* don't wait. Just return EGAIN.
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*/
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if (filep->f_oflags & O_NONBLOCK)
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{
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nread = -EAGAIN;
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break;
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}
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/* Otherwise, wait for something to be written to the circular
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* buffer. Increment the number of waiters so that the
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* nxterm_write() will not that it needs to post the semaphore
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* to wake us up.
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*/
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sched_lock();
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priv->nwaiters++;
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nxterm_sempost(priv);
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/* We may now be pre-empted! But that should be okay because we
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* have already incremented nwaiters. Pre-emption is disabled
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* but will be re-enabled while we are waiting.
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*/
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ret = nxsem_wait(&priv->waitsem);
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/* Pre-emption will be disabled when we return. So the
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* decrementing nwaiters here is safe.
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*/
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priv->nwaiters--;
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sched_unlock();
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/* Did we successfully get the waitsem? */
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if (ret >= 0)
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{
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/* Yes... then retake the mutual exclusion semaphore */
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ret = nxterm_semwait(priv);
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}
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/* Was the semaphore wait successful? Did we successful re-take the
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* mutual exclusion semaphore?
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*/
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if (ret < 0)
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{
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/* No.. One of the two nxterm_semwait's failed. */
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gerr("ERROR: nxterm_semwait failed\n");
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/* Were we awakened by a signal? Did we read anything before
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* we received the signal?
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*/
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if (ret != -EINTR || nread >= 0)
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{
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/* Yes.. return the error. */
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nread = ret;
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}
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/* Break out to return what we have. Note, we can't exactly
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* "break" out because whichever error occurred, we do not hold
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* the exclusion semaphore.
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*/
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goto errout_without_sem;
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}
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}
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else
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{
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/* The circular buffer is not empty, get the next byte from the
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* tail index.
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*/
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ch = priv->rxbuffer[priv->tail];
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/* Increment the tail index and re-enable interrupts */
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if (++priv->tail >= CONFIG_NXTERM_KBDBUFSIZE)
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{
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priv->tail = 0;
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}
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/* Add the character to the user buffer */
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buffer[nread] = ch;
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nread++;
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}
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}
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/* Relinquish the mutual exclusion semaphore */
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nxterm_sempost(priv);
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/* Notify all poll/select waiters that they can write to the FIFO */
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errout_without_sem:
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if (nread > 0)
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{
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nxterm_pollnotify(priv, POLLOUT);
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}
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/* Return the number of characters actually read */
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return nread;
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}
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/****************************************************************************
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* Name: nxterm_poll
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****************************************************************************/
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int nxterm_poll(FAR struct file *filep, FAR struct pollfd *fds, bool setup)
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{
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FAR struct inode *inode = filep->f_inode;
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FAR struct nxterm_state_s *priv;
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pollevent_t eventset;
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int ret;
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int i;
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/* Some sanity checking */
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DEBUGASSERT(inode && inode->i_private);
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priv = inode->i_private;
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/* Get exclusive access to the driver structure */
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ret = nxterm_semwait(priv);
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if (ret < 0)
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{
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gerr("ERROR: nxterm_semwait failed\n");
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return ret;
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}
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/* Are we setting up the poll? Or tearing it down? */
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if (setup)
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{
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/* This is a request to set up the poll. Find an available
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* slot for the poll structure reference
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*/
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for (i = 0; i < CONFIG_NXTERM_NPOLLWAITERS; i++)
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{
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/* Find an available slot */
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if (!priv->fds[i])
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{
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/* Bind the poll structure and this slot */
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priv->fds[i] = fds;
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fds->priv = &priv->fds[i];
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break;
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}
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}
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if (i >= CONFIG_NXTERM_NPOLLWAITERS)
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{
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gerr("ERROR: Too many poll waiters\n");
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fds->priv = NULL;
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ret = -EBUSY;
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goto errout;
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}
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/* Should immediately notify on any of the requested events?
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* This driver is always available for transmission.
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*/
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eventset = POLLOUT;
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/* Check if the receive buffer is empty */
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if (priv->head != priv->tail)
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{
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eventset |= POLLIN;
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}
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nxterm_pollnotify(priv, eventset);
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}
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else if (fds->priv)
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{
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/* This is a request to tear down the poll. */
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struct pollfd **slot = (struct pollfd **)fds->priv;
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#ifdef CONFIG_DEBUG_GRAPHICS
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if (!slot)
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{
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gerr("ERROR: No slot\n");
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ret = -EIO;
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goto errout;
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}
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#endif
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/* Remove all memory of the poll setup */
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*slot = NULL;
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fds->priv = NULL;
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}
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errout:
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nxterm_sempost(priv);
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return ret;
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}
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/****************************************************************************
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* Name: nxterm_kbdin
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*
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* Description:
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* This function should be driven by the window kbdin callback function
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* (see nx.h). When the NxTerm is the top window and keyboard input is
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* received on the top window, that window callback should be directed to
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* this function. This function will buffer the keyboard data and makE
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* it available to the NxTerm as stdin.
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*
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* If CONFIG_NXTERM_NXKBDIN is not selected, then the NxTerm will
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* receive its input from stdin (/dev/console). This works great but
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* cannot be shared between different windows. Chaos will ensue if you
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* try to support multiple NxTerm windows without CONFIG_NXTERM_NXKBDIN
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*
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* Input Parameters:
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* handle - A handle previously returned by nx_register, nxtk_register, or
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* nxtool_register.
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* buffer - The array of characters
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* buflen - The number of characters that are available in buffer[]
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*
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* Returned Value:
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* None
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*
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****************************************************************************/
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void nxterm_kbdin(NXTERM handle, FAR const uint8_t *buffer, uint8_t buflen)
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{
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FAR struct nxterm_state_s *priv;
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ssize_t nwritten;
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int nexthead;
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char ch;
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int ret;
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ginfo("buflen=%" PRId8 "\n", buflen);
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DEBUGASSERT(handle);
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/* Get the reference to the driver structure from the handle */
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priv = (FAR struct nxterm_state_s *)handle;
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/* Get exclusive access to the driver structure */
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ret = nxterm_semwait(priv);
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if (ret < 0)
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{
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gerr("ERROR: nxterm_semwait failed\n");
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return;
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}
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/* Loop until all of the bytes have been written. This function may be
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* called from an interrupt handler! Semaphores cannot be used!
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*
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* The write logic only needs to modify the head index. Therefore,
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* there is a difference in the way that head and tail are protected:
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* tail is protected with a semaphore; tail is protected by disabling
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* interrupts.
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*/
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for (nwritten = 0; nwritten < buflen; nwritten++)
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{
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/* Add the next character */
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ch = buffer[nwritten];
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/* Calculate the write index AFTER the next byte is add to the ring
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* buffer
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*/
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nexthead = priv->head + 1;
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if (nexthead >= CONFIG_NXTERM_KBDBUFSIZE)
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{
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nexthead = 0;
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}
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/* Would the next write overflow the circular buffer? */
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if (nexthead == priv->tail)
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{
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/* Yes... Return an indication that nothing was saved in
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* the buffer.
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*/
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gerr("ERROR: Keyboard data overrun\n");
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break;
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}
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/* No... copy the byte */
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priv->rxbuffer[priv->head] = ch;
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priv->head = nexthead;
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}
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/* Was anything written? */
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if (nwritten > 0)
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{
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int i;
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/* Are there threads waiting for read data? */
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sched_lock();
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/* Notify all poll/select waiters that they can read from the FIFO */
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nxterm_pollnotify(priv, POLLIN);
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for (i = 0; i < priv->nwaiters; i++)
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{
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/* Yes.. Notify all of the waiting readers that more data is
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* available
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*/
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nxsem_post(&priv->waitsem);
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}
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sched_unlock();
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}
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nxterm_sempost(priv);
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}
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#endif /* CONFIG_NXTERM_NXKBDIN */
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