421 lines
11 KiB
C
421 lines
11 KiB
C
/****************************************************************************
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* drivers/input/keyboard_upper.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 <assert.h>
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#include <debug.h>
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#include <fcntl.h>
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#include <poll.h>
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#include <nuttx/input/keyboard.h>
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#include <nuttx/kmalloc.h>
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#include <nuttx/list.h>
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#include <nuttx/mm/circbuf.h>
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#include <nuttx/mutex.h>
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/****************************************************************************
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* Pre-processor Definitions
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****************************************************************************/
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/****************************************************************************
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* Private Types
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****************************************************************************/
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struct keyboard_opriv_s
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{
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sem_t waitsem;
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mutex_t lock;
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struct circbuf_s circ;
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struct list_node node;
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FAR struct pollfd *fds;
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};
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/* This structure is for keyboard upper half driver */
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struct keyboard_upperhalf_s
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{
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mutex_t lock; /* Manages exclusive access to this structure */
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struct list_node head; /* Head of list */
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FAR struct keyboard_lowerhalf_s
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*lower; /* A pointer of lower half instance */
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uint8_t nums; /* Number of buffer */
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};
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/****************************************************************************
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* Private Function Prototypes
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****************************************************************************/
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static int keyboard_open(FAR struct file *filep);
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static int keyboard_close(FAR struct file *filep);
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static ssize_t keyboard_read(FAR struct file *filep, FAR char *buffer,
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size_t len);
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static ssize_t keyboard_write(FAR struct file *filep, FAR const char *buffer,
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size_t len);
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static int keyboard_poll(FAR struct file *filep, FAR struct pollfd *fds,
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bool setup);
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/****************************************************************************
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* Private Data
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****************************************************************************/
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static const struct file_operations g_keyboard_fops =
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{
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keyboard_open, /* open */
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keyboard_close, /* close */
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keyboard_read, /* read */
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keyboard_write, /* write */
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NULL, /* seek */
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NULL, /* ioctl */
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keyboard_poll /* poll */
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#ifndef CONFIG_DISABLE_PSEUDOFS_OPERATIONS
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, NULL /* unlink */
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#endif
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};
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/****************************************************************************
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* Private Functions
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****************************************************************************/
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/****************************************************************************
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* Name: keyboard_open
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****************************************************************************/
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static int keyboard_open(FAR struct file *filep)
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{
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FAR struct keyboard_opriv_s *opriv = NULL;
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FAR struct inode *inode = filep->f_inode;
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FAR struct keyboard_upperhalf_s *upper = inode->i_private;
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int ret;
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ret = nxmutex_lock(&upper->lock);
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if (ret < 0)
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{
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return ret;
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}
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opriv = kmm_zalloc(sizeof(FAR struct keyboard_opriv_s));
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if (opriv == NULL)
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{
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nxmutex_unlock(&upper->lock);
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return -ENOMEM;
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}
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/* Initializes the buffer for each open file */
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ret = circbuf_init(&opriv->circ, NULL, upper->nums);
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if (ret < 0)
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{
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kmm_free(opriv);
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nxmutex_unlock(&upper->lock);
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return ret;
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}
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/* Perform the operations required by the lower level */
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if (upper->lower->open)
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{
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ret = upper->lower->open(upper->lower);
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if (ret < 0)
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{
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kmm_free(opriv);
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nxmutex_unlock(&upper->lock);
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return ret;
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}
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}
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nxsem_init(&opriv->waitsem, 0, 0);
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nxmutex_init(&opriv->lock);
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list_add_tail(&upper->head, &opriv->node);
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filep->f_priv = opriv;
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nxmutex_unlock(&upper->lock);
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return ret;
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}
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/****************************************************************************
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* Name: keyboard_close
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****************************************************************************/
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static int keyboard_close(FAR struct file *filep)
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{
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FAR struct keyboard_opriv_s *opriv = filep->f_priv;
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FAR struct inode *inode = filep->f_inode;
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FAR struct keyboard_upperhalf_s *upper = inode->i_private;
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int ret;
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ret = nxmutex_lock(&upper->lock);
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if (ret < 0)
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{
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return ret;
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}
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/* Perform the operations required by the lower level */
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if (upper->lower->close)
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{
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ret = upper->lower->close(upper->lower);
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if (ret < 0)
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{
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goto out;
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}
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}
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list_delete(&opriv->node);
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circbuf_uninit(&opriv->circ);
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nxsem_destroy(&opriv->waitsem);
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nxmutex_destroy(&opriv->lock);
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kmm_free(opriv);
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out:
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nxmutex_unlock(&upper->lock);
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return ret;
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}
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/****************************************************************************
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* Name: keyboard_read
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****************************************************************************/
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static ssize_t keyboard_read(FAR struct file *filep,
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FAR char *buff, size_t len)
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{
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FAR struct keyboard_opriv_s *opriv = filep->f_priv;
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int ret;
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/* Make sure that we have exclusive access to the private data structure */
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ret = nxmutex_lock(&opriv->lock);
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if (ret < 0)
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{
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return ret;
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}
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/* Is there keyboard data now? */
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while (circbuf_is_empty(&opriv->circ))
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{
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if ((filep->f_oflags & O_NONBLOCK) != 0)
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{
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ret = -EAGAIN;
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goto out;
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}
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else
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{
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nxmutex_unlock(&opriv->lock);
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ret = nxsem_wait_uninterruptible(&opriv->waitsem);
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if (ret < 0)
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{
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return ret;
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}
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ret = nxmutex_lock(&opriv->lock);
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if (ret < 0)
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{
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return ret;
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}
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}
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}
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ret = circbuf_read(&opriv->circ, buff, len);
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out:
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nxmutex_unlock(&opriv->lock);
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return ret;
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}
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/****************************************************************************
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* Name: keyboard_poll
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****************************************************************************/
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static int keyboard_poll(FAR struct file *filep,
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FAR struct pollfd *fds, bool setup)
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{
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FAR struct keyboard_opriv_s *opriv = filep->f_priv;
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int ret;
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ret = nxmutex_lock(&opriv->lock);
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if (ret < 0)
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{
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return ret;
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}
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if (setup)
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{
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if (opriv->fds == NULL)
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{
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opriv->fds = fds;
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fds->priv = &opriv->fds;
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}
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else
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{
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ret = -EBUSY;
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goto errout;
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}
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if (!circbuf_is_empty(&opriv->circ))
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{
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poll_notify(&opriv->fds, 1, POLLIN);
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}
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}
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else
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{
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opriv->fds = NULL;
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fds->priv = NULL;
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}
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errout:
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nxmutex_unlock(&opriv->lock);
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return ret;
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}
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/****************************************************************************
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* Name: keyboard_write
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****************************************************************************/
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static ssize_t keyboard_write(FAR struct file *filep,
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FAR const char *buffer, size_t buflen)
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{
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FAR struct inode *inode = filep->f_inode;
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FAR struct keyboard_upperhalf_s *upper = inode->i_private;
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FAR struct keyboard_lowerhalf_s *lower = upper->lower;
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if (lower->write != NULL)
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{
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return lower->write(lower, buffer, buflen);
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}
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return -ENOSYS;
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}
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/****************************************************************************
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* Public Function
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****************************************************************************/
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/****************************************************************************
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* Name: keyboard_register
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****************************************************************************/
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int keyboard_register(FAR struct keyboard_lowerhalf_s *lower,
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FAR const char *path, uint8_t nums)
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{
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FAR struct keyboard_upperhalf_s *upper;
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int ret;
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iinfo("Registering %s\n", path);
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if (lower == NULL)
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{
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ierr("ERROR: invalid touchscreen device\n");
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return -EINVAL;
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}
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upper = kmm_zalloc(sizeof(struct keyboard_upperhalf_s));
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if (upper == NULL)
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{
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ierr("ERROR: Failed to mem alloc!\n");
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return -ENOMEM;
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}
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upper->lower = lower;
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upper->nums = nums;
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lower->priv = upper;
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list_initialize(&upper->head);
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nxmutex_init(&upper->lock);
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ret = register_driver(path, &g_keyboard_fops, 0666, upper);
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if (ret < 0)
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{
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nxmutex_destroy(&upper->lock);
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kmm_free(upper);
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return ret;
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}
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return ret;
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}
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/****************************************************************************
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* Name: keyboard_unregister
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****************************************************************************/
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int keyboard_unregister(FAR struct keyboard_lowerhalf_s *lower,
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FAR const char *path)
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{
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FAR struct keyboard_upperhalf_s *upper;
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int ret;
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DEBUGASSERT(lower != NULL);
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DEBUGASSERT(lower->priv != NULL);
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upper = lower->priv;
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iinfo("UnRegistering %s\n", path);
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ret = unregister_driver(path);
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if (ret < 0)
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{
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return ret;
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}
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nxmutex_destroy(&upper->lock);
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kmm_free(upper);
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return 0;
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}
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/****************************************************************************
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* keyboard_event
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****************************************************************************/
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void keyboard_event(FAR struct keyboard_lowerhalf_s *lower, uint32_t keycode,
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uint32_t type)
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{
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FAR struct keyboard_upperhalf_s *upper = lower->priv;
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FAR struct keyboard_opriv_s *opriv;
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struct keyboard_event_s key;
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int semcount;
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if (nxmutex_lock(&upper->lock) < 0)
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{
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return;
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}
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key.code = keycode;
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key.type = type;
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list_for_every_entry(&upper->head, opriv, struct keyboard_opriv_s, node)
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{
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if (nxmutex_lock(&opriv->lock) == 0)
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{
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circbuf_overwrite(&opriv->circ, &key,
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sizeof(struct keyboard_event_s));
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nxsem_get_value(&opriv->waitsem, &semcount);
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if (semcount < 1)
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{
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nxsem_post(&opriv->waitsem);
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}
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poll_notify(&opriv->fds, 1, POLLIN);
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nxmutex_unlock(&opriv->lock);
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}
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}
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nxmutex_unlock(&upper->lock);
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}
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