diff options
Diffstat (limited to 'nuttx/drivers/power/battery.c')
| -rw-r--r-- | nuttx/drivers/power/battery.c | 254 |
1 files changed, 254 insertions, 0 deletions
diff --git a/nuttx/drivers/power/battery.c b/nuttx/drivers/power/battery.c new file mode 100644 index 000000000..698e5571b --- /dev/null +++ b/nuttx/drivers/power/battery.c @@ -0,0 +1,254 @@ +/**************************************************************************** + * drivers/power/battery.c + * Upper-half, character driver for batteries. + * + * Copyright (C) 2012 Gregory Nutt. All rights reserved. + * Author: Gregory Nutt <gnutt@nuttx.org> + * + * Redistribution and use in source and binary forms, with or without + * modification, are permitted provided that the following conditions + * are met: + * + * 1. Redistributions of source code must retain the above copyright + * notice, this list of conditions and the following disclaimer. + * 2. Redistributions in binary form must reproduce the above copyright + * notice, this list of conditions and the following disclaimer in + * the documentation and/or other materials provided with the + * distribution. + * 3. Neither the name NuttX nor the names of its contributors may be + * used to endorse or promote products derived from this software + * without specific prior written permission. + * + * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS + * "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT + * LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS + * FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE + * COPYRIGHT OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, + * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, + * BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS + * OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED + * AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT + * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN + * ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE + * POSSIBILITY OF SUCH DAMAGE. + * + ****************************************************************************/ + +/**************************************************************************** + * Included Files + ****************************************************************************/ + +#include <nuttx/config.h> + +#include <stdbool.h> +#include <semaphore.h> +#include <errno.h> +#include <debug.h> + +#include <nuttx/fs/fs.h> +#include <nuttx/power/battery.h> + +/* This driver requires: + * + * CONFIG_BATTERY - Upper half battery driver support + */ + +#if defined(CONFIG_BATTERY) + +/**************************************************************************** + * Pre-processor Definitions + ****************************************************************************/ + +/**************************************************************************** + * Private + ****************************************************************************/ + +/**************************************************************************** + * Private Function Prototypes + ****************************************************************************/ + +/* Character driver methods */ + +static int bat_open(FAR struct file *filep); +static int bat_close(FAR struct file *filep); +static ssize_t bat_read(FAR struct file *, FAR char *, size_t nbytes); +static ssize_t bat_write(FAR struct file *filep, FAR const char *buffer, size_t buflen); +static int bat_ioctl(FAR struct file *filep,int cmd,unsigned long arg); + +/**************************************************************************** + * Private Data + ****************************************************************************/ + +static const struct file_operations g_batteryops = +{ + bat_open, + bat_close, + bat_read, + bat_write, + 0, + bat_ioctl +#ifndef CONFIG_DISABLE_POLL + , 0 +#endif +}; + +/**************************************************************************** + * Private Functions + ****************************************************************************/ +/**************************************************************************** + * Name: bat_open + * + * Description: + * This function is called whenever the battery device is opened. + * + ****************************************************************************/ + +static int bat_open(FAR struct file *filep) +{ + return OK; +} + +/**************************************************************************** + * Name: bat_close + * + * Description: + * This routine is called when the battery device is closed. + * + ****************************************************************************/ + +static int bat_close(FAR struct file *filep) +{ + return OK; +} + +/**************************************************************************** + * Name: bat_read + ****************************************************************************/ + +static ssize_t bat_read(FAR struct file *filep, FAR char *buffer, size_t buflen) +{ + /* Return nothing read */ + + return 0; +} + +/**************************************************************************** + * Name: bat_write + ****************************************************************************/ + +static ssize_t bat_write(FAR struct file *filep, FAR const char *buffer, + size_t buflen) +{ + /* Return nothing written */ + + return 0; +} + +/**************************************************************************** + * Name: bat_ioctl + ****************************************************************************/ + +static int bat_ioctl(FAR struct file *filep, int cmd, unsigned long arg) +{ + FAR struct inode *inode = filep->f_inode; + FAR struct battery_dev_s *dev = inode->i_private; + int ret = -EINVAL; + + /* Inforce mutually exclusive access to the battery driver */ + + ret = sem_wait(&dev->batsem); + if (ret < 0) + { + return -errno; /* Probably EINTR */ + } + + /* Procss the IOCTL command */ + + ret = -EINVAL; /* Assume a bad argument */ + switch (cmd) + { + case BATIOC_STATE: + { + FAR int *ptr = (FAR int *)((uintptr_t)arg); + if (ptr) + { + ret = dev->ops->state(dev, ptr); + } + } + break; + + case BATIOC_ONLINE: + { + FAR bool *ptr = (FAR bool *)((uintptr_t)arg); + if (ptr) + { + ret = dev->ops->online(dev, ptr); + } + } + break; + + case BATIOC_VOLTAGE: + { + FAR b16_t *ptr = (FAR b16_t *)((uintptr_t)arg); + if (ptr) + { + ret = dev->ops->voltage(dev, ptr); + } + } + break; + + case BATIOC_CAPACITY: + { + FAR b16_t *ptr = (FAR b16_t *)((uintptr_t)arg); + if (ptr) + { + ret = dev->ops->capacity(dev, ptr); + } + } + break; + + default: + dbg("Unrecognized cmd: %d\n", cmd); + ret = -ENOTTY; + break; + } + + sem_post(&dev->batsem); + return ret; +} + +/**************************************************************************** + * Public Functions + ****************************************************************************/ + +/**************************************************************************** + * Name: battery_register + * + * Description: + * Register a lower half battery driver with the common, upper-half + * battery driver. + * + * Input parameters: + * devpath - The location in the pseudo-filesystem to create the driver. + * Recommended standard is "/dev/bat0", "/dev/bat1", etc. + * dev - An instance of the battery state structure . + * + * Returned value: + * Zero on success or a negated errno value on failure. + * + ****************************************************************************/ + +int battery_register(FAR const char *devpath, FAR struct battery_dev_s *dev) +{ + int ret; + + /* Register the character driver */ + + ret = register_driver(devpath, &g_batteryops, 0555, dev); + if (ret < 0) + { + dbg("Failed to register driver: %d\n", ret); + } + return ret; +} +#endif /* CONFIG_BATTERY */ |