354 lines
9.8 KiB
C
354 lines
9.8 KiB
C
/****************************************************************************
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* drivers/power/battery_monitor.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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/* Upper-half, character driver for battery manager & monitor ICs. */
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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 <stdbool.h>
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#include <errno.h>
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#include <debug.h>
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#include <nuttx/semaphore.h>
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#include <nuttx/fs/fs.h>
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#include <nuttx/power/battery_monitor.h>
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#include <nuttx/power/battery_ioctl.h>
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/* This driver requires:
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*
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* CONFIG_BATTERY_MONITOR - Upper half battery driver support
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*/
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#if defined(CONFIG_BATTERY_MONITOR)
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/****************************************************************************
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* Pre-processor Definitions
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****************************************************************************/
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/****************************************************************************
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* Private
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****************************************************************************/
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/****************************************************************************
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* Private Function Prototypes
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****************************************************************************/
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/* Character driver methods */
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static int bat_monitor_open(FAR struct file *filep);
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static int bat_monitor_close(FAR struct file *filep);
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static ssize_t bat_monitor_read(FAR struct file *filep, FAR char *buffer,
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size_t buflen);
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static ssize_t bat_monitor_write(FAR struct file *filep,
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FAR const char *buffer, size_t buflen);
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static int bat_monitor_ioctl(FAR struct file *filep, int cmd,
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unsigned long arg);
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/****************************************************************************
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* Private Data
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****************************************************************************/
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static const struct file_operations g_batteryops =
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{
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bat_monitor_open,
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bat_monitor_close,
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bat_monitor_read,
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bat_monitor_write,
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NULL,
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bat_monitor_ioctl,
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NULL
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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: bat_monitor_open
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*
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* Description:
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* This function is called whenever the battery device is opened.
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*
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****************************************************************************/
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static int bat_monitor_open(FAR struct file *filep)
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{
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return OK;
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}
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/****************************************************************************
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* Name: bat_monitor_close
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*
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* Description:
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* This routine is called when the battery device is closed.
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*
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****************************************************************************/
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static int bat_monitor_close(FAR struct file *filep)
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{
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return OK;
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}
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/****************************************************************************
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* Name: bat_monitor_read
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****************************************************************************/
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static ssize_t bat_monitor_read(FAR struct file *filep, FAR char *buffer,
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size_t buflen)
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{
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/* Return nothing read */
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return 0;
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}
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/****************************************************************************
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* Name: bat_monitor_write
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****************************************************************************/
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static ssize_t bat_monitor_write(FAR struct file *filep,
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FAR const char *buffer, size_t buflen)
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{
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/* Return nothing written */
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return 0;
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}
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/****************************************************************************
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* Name: bat_monitor_ioctl
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****************************************************************************/
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static int bat_monitor_ioctl(FAR struct file *filep, int cmd,
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unsigned long arg)
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{
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FAR struct inode *inode = filep->f_inode;
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FAR struct battery_monitor_dev_s *dev = inode->i_private;
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int ret;
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/* Enforce mutually exclusive access to the battery driver */
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ret = nxsem_wait(&dev->batsem);
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if (ret < 0)
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{
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return ret; /* Probably -EINTR */
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}
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/* Process the IOCTL command */
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ret = -EINVAL; /* Assume a bad argument */
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switch (cmd)
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{
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case BATIOC_STATE:
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{
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FAR int *ptr = (FAR int *)((uintptr_t)arg);
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if (ptr)
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{
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ret = dev->ops->state(dev, ptr);
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}
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}
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break;
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case BATIOC_HEALTH:
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{
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FAR int *ptr = (FAR int *)((uintptr_t)arg);
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if (ptr)
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{
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ret = dev->ops->health(dev, ptr);
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}
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}
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break;
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case BATIOC_ONLINE:
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{
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FAR bool *ptr = (FAR bool *)((uintptr_t)arg);
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if (ptr)
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{
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ret = dev->ops->online(dev, ptr);
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}
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}
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break;
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case BATIOC_VOLTAGE:
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{
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FAR int *voltsp = (FAR int *)((uintptr_t)arg);
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if (voltsp)
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{
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ret = dev->ops->voltage(dev, voltsp);
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}
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}
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break;
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case BATIOC_CURRENT:
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{
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FAR struct battery_monitor_current_s *current =
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(FAR struct battery_monitor_current_s *)((uintptr_t)arg);
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if (current)
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{
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ret = dev->ops->current(dev, current);
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}
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}
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break;
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case BATIOC_OPERATE:
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{
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FAR int *ptr = (FAR int *)((uintptr_t)arg);
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if (ptr)
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{
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ret = dev->ops->operate(dev, (uintptr_t)arg);
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}
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}
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break;
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case BATIOC_CELLVOLTAGE:
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{
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FAR struct battery_monitor_voltage_s *ptr =
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(FAR struct battery_monitor_voltage_s *)((uintptr_t)arg);
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if (ptr)
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{
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ret = dev->ops->cell_voltage(dev, ptr);
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}
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}
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break;
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case BATIOC_BALANCE:
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{
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FAR struct battery_monitor_balance_s *ptr =
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(FAR struct battery_monitor_balance_s *)((uintptr_t)arg);
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if (ptr)
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{
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ret = dev->ops->balance(dev, ptr);
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}
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}
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break;
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case BATIOC_SHUTDOWN:
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{
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/* Options are not currently used by shutdown */
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ret = dev->ops->shutdown(dev, (uintptr_t)arg);
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}
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break;
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case BATIOC_SETLIMITS:
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{
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FAR struct battery_monitor_limits_s *ptr =
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(FAR struct battery_monitor_limits_s *)((uintptr_t)arg);
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if (ptr)
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{
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ret = dev->ops->setlimits(dev, ptr);
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}
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}
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break;
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case BATIOC_CHGDSG:
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{
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FAR struct battery_monitor_switches_s *ptr =
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(FAR struct battery_monitor_switches_s *)((uintptr_t)arg);
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if (ptr)
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{
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ret = dev->ops->chgdsg(dev, ptr);
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}
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}
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break;
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case BATIOC_CLEARFAULTS:
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{
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/* Options are not currently used by clear faults operation */
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ret = dev->ops->clearfaults(dev, (uintptr_t)arg);
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}
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break;
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case BATIOC_TEMPERATURE:
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{
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FAR struct battery_monitor_temperature_s *ptr =
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(FAR struct battery_monitor_temperature_s *)((uintptr_t)arg);
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if (ptr)
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{
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ret = dev->ops->temperature(dev, ptr);
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}
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}
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break;
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case BATIOC_COULOMBS:
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{
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FAR int *coulombp = (FAR int *)((uintptr_t)arg);
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if (coulombp)
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{
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ret = dev->ops->coulombs(dev, coulombp);
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}
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}
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break;
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default:
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_err("ERROR: Unrecognized cmd: %d\n", cmd);
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ret = -ENOTTY;
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break;
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}
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nxsem_post(&dev->batsem);
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return ret;
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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: battery_monitor_register
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*
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* Description:
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* Register a lower half battery driver with the common, upper-half
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* battery driver.
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*
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* Input Parameters:
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* devpath - The location in the pseudo-filesystem to create the driver.
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* Recommended standard is "/dev/bat0", "/dev/bat1", etc.
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* dev - An instance of the battery state structure .
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*
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* Returned Value:
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* Zero on success or a negated errno value on failure.
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*
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****************************************************************************/
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int battery_monitor_register(FAR const char *devpath,
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FAR struct battery_monitor_dev_s *dev)
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{
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int ret;
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/* Initialize the semaphore */
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nxsem_init(&dev->batsem, 0, 1);
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/* Register the character driver */
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ret = register_driver(devpath, &g_batteryops, 0555, dev);
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if (ret < 0)
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{
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_err("ERROR: Failed to register driver: %d\n", ret);
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}
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return ret;
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}
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#endif /* CONFIG_BATTERY_MONITOR */
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