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incubator-nuttx/graphics/nxterm/nxterm_driver.c

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/****************************************************************************
* graphics/nxterm/nxterm_driver.c
*
* SPDX-License-Identifier: Apache-2.0
*
* Licensed to the Apache Software Foundation (ASF) under one or more
* contributor license agreements. See the NOTICE file distributed with
* this work for additional information regarding copyright ownership. The
* ASF licenses this file to you under the Apache License, Version 2.0 (the
* "License"); you may not use this file except in compliance with the
* License. You may obtain a copy of the License at
*
* http://www.apache.org/licenses/LICENSE-2.0
*
* Unless required by applicable law or agreed to in writing, software
* distributed under the License is distributed on an "AS IS" BASIS, WITHOUT
* WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. See the
* License for the specific language governing permissions and limitations
* under the License.
*
****************************************************************************/
/****************************************************************************
* Included Files
****************************************************************************/
#include <nuttx/config.h>
#include <sys/types.h>
#include <stdbool.h>
#include <string.h>
#include <fcntl.h>
#include <assert.h>
#include <errno.h>
#include <debug.h>
#include <nuttx/fs/fs.h>
#include "nxterm.h"
/****************************************************************************
* Private Function Prototypes
****************************************************************************/
static int nxterm_open(FAR struct file *filep);
static int nxterm_close(FAR struct file *filep);
static ssize_t nxterm_write(FAR struct file *filep, FAR const char *buffer,
size_t buflen);
static int nxterm_ioctl(FAR struct file *filep, int cmd,
unsigned long arg);
#ifndef CONFIG_DISABLE_PSEUDOFS_OPERATIONS
static int nxterm_unlink(FAR struct inode *inode);
#endif
/****************************************************************************
* Public Data
****************************************************************************/
/* This is the common NX driver file operations */
#ifdef CONFIG_NXTERM_NXKBDIN
const struct file_operations g_nxterm_drvrops =
{
nxterm_open, /* open */
nxterm_close, /* close */
nxterm_read, /* read */
nxterm_write, /* write */
NULL, /* seek */
nxterm_ioctl, /* ioctl */
NULL, /* mmap */
NULL, /* truncate */
nxterm_poll, /* poll */
NULL, /* readv */
NULL /* writev */
#ifndef CONFIG_DISABLE_PSEUDOFS_OPERATIONS
, nxterm_unlink /* unlink */
#endif
};
#else /* CONFIG_NXTERM_NXKBDIN */
const struct file_operations g_nxterm_drvrops =
{
nxterm_open, /* open */
nxterm_close, /* close */
NULL, /* read */
nxterm_write, /* write */
NULL, /* seek */
nxterm_ioctl, /* ioctl */
NULL, /* mmap */
NULL, /* truncate */
NULL, /* poll */
NULL, /* readv */
NULL /* writev */
#ifndef CONFIG_DISABLE_PSEUDOFS_OPERATIONS
, nxterm_unlink /* unlink */
#endif
};
#endif /* CONFIG_NXTERM_NXKBDIN */
/****************************************************************************
* Private Functions
****************************************************************************/
/****************************************************************************
* Name: nxterm_open
****************************************************************************/
static int nxterm_open(FAR struct file *filep)
{
FAR struct inode *inode = filep->f_inode;
FAR struct nxterm_state_s *priv = inode->i_private;
/* Get the driver structure from the inode */
inode = filep->f_inode;
priv = inode->i_private;
DEBUGASSERT(priv);
/* Verify that the driver is opened for write-only access */
#ifndef CONFIG_NXTERM_NXKBDIN
if ((filep->f_oflags & O_RDOK) != 0)
{
gerr("ERROR: Attempted open with read access\n");
return -EACCES;
}
#endif
#ifndef CONFIG_DISABLE_PSEUDOFS_OPERATIONS
/* Increment the count of open file reference */
DEBUGASSERT(priv->orefs != UINT8_MAX);
priv->orefs++;
#endif
/* Assign the driver structure to the file */
filep->f_priv = priv;
return OK;
}
/****************************************************************************
* Name: nxterm_close
****************************************************************************/
static int nxterm_close(FAR struct file *filep)
{
#ifndef CONFIG_DISABLE_PSEUDOFS_OPERATIONS
FAR struct nxterm_state_s *priv;
int ret;
/* Recover our private state structure */
DEBUGASSERT(filep->f_priv != NULL);
priv = (FAR struct nxterm_state_s *)filep->f_priv;
/* Get exclusive access */
ret = nxmutex_lock(&priv->lock);
if (ret < 0)
{
return ret;
}
/* Has the driver been unlinked? Was this the last open references to the
* terminal driver?
*/
DEBUGASSERT(priv->orefs > 0);
if (priv->unlinked && priv->orefs <= 1)
{
/* Yes.. Unregister the terminal device */
nxmutex_unlock(&priv->lock);
nxterm_unregister(priv);
return OK;
}
else
{
/* No.. Just decrement the count of open file references */
priv->orefs--;
}
nxmutex_unlock(&priv->lock);
#endif
return OK;
}
/****************************************************************************
* Name: nxterm_write
****************************************************************************/
static ssize_t nxterm_write(FAR struct file *filep, FAR const char *buffer,
size_t buflen)
{
FAR struct nxterm_state_s *priv;
enum nxterm_vt100state_e state;
ssize_t remaining;
char ch;
int ret;
/* Recover our private state structure */
DEBUGASSERT(filep->f_priv != NULL);
priv = (FAR struct nxterm_state_s *)filep->f_priv;
/* Get exclusive access */
ret = nxmutex_lock(&priv->lock);
if (ret < 0)
{
return ret;
}
/* Hide the cursor while we update the display */
nxterm_hidecursor(priv);
/* Loop writing each character to the display */
for (remaining = (ssize_t)buflen; remaining > 0; remaining--)
{
/* Get the next character from the user buffer */
ch = *buffer++;
/* Check if this character is part of a VT100 escape sequence */
do
{
/* Is the character part of a VT100 escape sequnce? */
state = nxterm_vt100(priv, ch);
switch (state)
{
/* Character is not part of a VT100 escape sequence (and no
* characters are buffer.
*/
default:
case VT100_NOT_CONSUMED:
{
/* We can output the character to the window */
nxterm_putc(priv, (uint8_t)ch);
}
break;
/* The full VT100 escape sequence was processed (and the new
* character was consumed)
*/
case VT100_PROCESSED:
/* Character was consumed as part of the VT100 escape processing
* (but the escape sequence is still incomplete.
*/
case VT100_CONSUMED:
{
/* Do nothing... the VT100 logic owns the character */
}
break;
/* Invalid/unsupported character in escape sequence */
case VT100_ABORT:
{
int i;
/* Add the first unhandled character to the window */
nxterm_putc(priv, (uint8_t)priv->seq[0]);
/* Move all buffer characters down one */
for (i = 1; i < priv->nseq; i++)
{
priv->seq[i - 1] = priv->seq[i];
}
priv->nseq--;
/* Then loop again and check if what remains is part of a
* VT100 escape sequence. We could speed this up by
* checking if priv->seq[0] == ASCII_ESC.
*/
}
break;
}
}
while (state == VT100_ABORT);
}
/* Show the cursor at its new position */
nxterm_showcursor(priv);
nxmutex_unlock(&priv->lock);
return (ssize_t)buflen;
}
/****************************************************************************
* Name: nxterm_ioctl
****************************************************************************/
static int nxterm_ioctl(FAR struct file *filep, int cmd, unsigned long arg)
{
/* NOTE: We don't need driver context here because the NXTERM handle
* provided within each of the NXTERM IOCTL command data. Mutual
* exclusion is similar managed by the IOCTL cmmand handler.
*
* This permits the IOCTL to be called in abnormal context (such as
* from boardctl())
*/
return nxterm_ioctl_tap(cmd, arg);
}
/****************************************************************************
* Name: nxterm_unlink
****************************************************************************/
#ifndef CONFIG_DISABLE_PSEUDOFS_OPERATIONS
static int nxterm_unlink(FAR struct inode *inode)
{
FAR struct nxterm_state_s *priv;
int ret;
DEBUGASSERT(inode->i_private != NULL);
priv = inode->i_private;
/* Get exclusive access */
ret = nxmutex_lock(&priv->lock);
if (ret < 0)
{
return ret;
}
/* Are there open references to the terminal driver? */
if (priv->orefs > 0)
{
/* Yes.. Just mark the driver unlinked. Resources will be cleaned up
* when the final reference is close.
*/
priv->unlinked = true;
}
else
{
/* No.. Unregister the terminal device now */
nxmutex_unlock(&priv->lock);
nxterm_unregister(priv);
return OK;
}
nxmutex_unlock(&priv->lock);
return OK;
}
#endif
/****************************************************************************
* Public Functions
****************************************************************************/
/****************************************************************************
* Name: nxterm_ioctl_tap
*
* Description:
* Execute an NXTERM IOCTL command from an external caller.
*
* NOTE: We don't need driver context here because the NXTERM handle
* provided within each of the NXTERM IOCTL command data. Mutual
* exclusion is similar managed by the IOCTL cmmand handler.
*
* This permits the IOCTL to be called in abnormal context (such as
* from boardctl())
*
****************************************************************************/
int nxterm_ioctl_tap(int cmd, uintptr_t arg)
{
int ret;
switch (cmd)
{
/* CMD: NXTERMIOC_NXTERM_REDRAW
* DESCRIPTION: Re-draw a portion of the NX console. This function
* should be called from the appropriate window callback
* logic.
* ARG: A reference readable instance of struct
* nxtermioc_redraw_s
* CONFIGURATION: CONFIG_NXTERM
*/
case NXTERMIOC_NXTERM_REDRAW:
{
FAR struct nxtermioc_redraw_s *redraw =
(FAR struct nxtermioc_redraw_s *)((uintptr_t)arg);
nxterm_redraw(redraw->handle, &redraw->rect, redraw->more);
ret = OK;
}
break;
/* CMD: NXTERMIOC_NXTERM_KBDIN
* DESCRIPTION: Provide NxTerm keyboard input to NX.
* ARG: A reference readable instance of struct
* nxtermioc_kbdin_s
* CONFIGURATION: CONFIG_NXTERM_NXKBDIN
*/
case NXTERMIOC_NXTERM_KBDIN:
{
#ifdef CONFIG_NXTERM_NXKBDIN
FAR struct nxtermioc_kbdin_s *kbdin =
(FAR struct nxtermioc_kbdin_s *)((uintptr_t)arg);
nxterm_kbdin(kbdin->handle, kbdin->buffer, kbdin->buflen);
ret = OK;
#else
ret = -ENOSYS;
#endif
}
break;
/* CMD: NXTERMIOC_NXTERM_RESIZE
* DESCRIPTION: Inform NxTerm keyboard the the size of the window has
* changed
* ARG: A reference readable instance of struct
* nxtermioc_resize_s
* CONFIGURATION: CONFIG_NXTERM
*/
case NXTERMIOC_NXTERM_RESIZE:
{
FAR struct nxtermioc_resize_s *resize =
(FAR struct nxtermioc_resize_s *)((uintptr_t)arg);
ret = nxterm_resize(resize->handle, &resize->size);
}
break;
default:
ret = -ENOTTY;
break;
}
return ret;
}
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