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incubator-nuttx/drivers/power/battery/mcp73871.c

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/****************************************************************************
* drivers/power/battery/mcp73871.c
*
* 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.
*
****************************************************************************/
/* Lower half driver for Microchip MCP73871 battery charger
*
* The MCP73871 is a standalone battery charger, so this driver is not
* supposed to do much things, it will only report faults and battery status.
*/
/****************************************************************************
* Included Files
****************************************************************************/
#include <nuttx/config.h>
#include <sys/types.h>
#include <unistd.h>
#include <stdint.h>
#include <stdbool.h>
#include <errno.h>
#include <debug.h>
#include <nuttx/kmalloc.h>
#include <nuttx/signal.h>
#include <nuttx/power/battery_charger.h>
#include <nuttx/power/battery_ioctl.h>
#include <nuttx/power/mcp73871.h>
/* This driver requires:
*
* CONFIG_BATTERY_CHARGER - Upper half battery driver support
*/
#if defined(CONFIG_BATTERY_CHARGER)
/****************************************************************************
* Pre-processor Definitions
****************************************************************************/
/****************************************************************************
* Private
****************************************************************************/
struct mcp73871_dev_s
{
/* The common part of the battery driver visible to the upper-half driver */
struct battery_charger_dev_s dev; /* Battery charger device */
/* MCP73871 configuration helpers */
FAR struct mcp73871_config_s *config;
};
/****************************************************************************
* Private Function Prototypes
****************************************************************************/
/* Battery driver lower half methods */
static int mcp73871_state(FAR struct battery_charger_dev_s *dev,
FAR int *status);
static int mcp73871_health(FAR struct battery_charger_dev_s *dev,
FAR int *health);
static int mcp73871_online(FAR struct battery_charger_dev_s *dev,
FAR bool *status);
static int mcp73871_voltage(FAR struct battery_charger_dev_s *dev,
int value);
static int mcp73871_current(FAR struct battery_charger_dev_s *dev,
int value);
static int mcp73871_input_current(FAR struct battery_charger_dev_s *dev,
int value);
static int mcp73871_operate(FAR struct battery_charger_dev_s *dev,
intptr_t param);
/****************************************************************************
* Private Data
****************************************************************************/
static const struct battery_charger_operations_s g_mcp73871ops =
{
mcp73871_state,
mcp73871_health,
mcp73871_online,
mcp73871_voltage,
mcp73871_current,
mcp73871_input_current,
mcp73871_operate
};
/****************************************************************************
* Private Functions
****************************************************************************/
/****************************************************************************
* Name: mcp73871_state
*
* Description:
* Return the current battery state
*
****************************************************************************/
static int mcp73871_state(FAR struct battery_charger_dev_s *dev,
FAR int *status)
{
FAR struct mcp73871_dev_s *priv = (FAR struct mcp73871_dev_s *)dev;
uint8_t value = 0;
/* Create a value with bits 2 1 0 = STAT1 | STAT2 | PG */
value = (priv->config->read_stat1() << 2) |
(priv->config->read_stat2() << 1) |
(priv->config->read_pg() << 0);
switch (value)
{
case MCP73871_FAULT:
*status = BATTERY_FAULT;
break;
case MCP73871_CHARGING:
*status = BATTERY_CHARGING;
break;
case MCP73871_BAT_LOW:
*status = BATTERY_DISCHARGING;
break;
case MCP73871_CHG_COMPLETE:
*status = BATTERY_FULL;
break;
case MCP73871_NO_BATTERY:
*status = BATTERY_FAULT;
break;
case MCP73871_NO_INPUT_PWR:
*status = BATTERY_FAULT;
break;
default:
*status = BATTERY_HEALTH_UNKNOWN;
break;
}
return OK;
}
/****************************************************************************
* Name: mcp73871_health
*
* Description:
* Return the current battery health state
*
* Note: if more than one fault happened the user needs to call this ioctl
* again to read a new fault, repeat until receive a BATTERY_HEALTH_GOOD.
*
****************************************************************************/
static int mcp73871_health(FAR struct battery_charger_dev_s *dev,
FAR int *health)
{
FAR struct mcp73871_dev_s *priv = (FAR struct mcp73871_dev_s *)dev;
uint8_t value = 0;
/* Create a value with bits 2 1 0 = STAT1 | STAT2 | PG */
value = (priv->config->read_stat1() << 2) |
(priv->config->read_stat2() << 1) |
(priv->config->read_pg() << 0);
switch (value)
{
case MCP73871_FAULT:
*health = BATTERY_HEALTH_SAFE_TMR_EXP;
break;
case MCP73871_CHARGING:
case MCP73871_CHG_COMPLETE:
*health = BATTERY_HEALTH_GOOD;
break;
case MCP73871_NO_BATTERY:
*health = BATTERY_HEALTH_DISCONNECTED;
break;
case MCP73871_BAT_LOW:
case MCP73871_NO_INPUT_PWR:
default:
*health = BATTERY_HEALTH_UNKNOWN;
break;
}
return OK;
}
/****************************************************************************
* Name: mcp73871_online
*
* Description:
* Return true if the battery is online
*
****************************************************************************/
static int mcp73871_online(FAR struct battery_charger_dev_s *dev,
FAR bool *status)
{
/* There is no concept of online/offline in this driver */
*status = true;
return OK;
}
/****************************************************************************
* Name: mcp73871_powersupply
*
* Description:
* Set the Power Supply Current Limit.
*
****************************************************************************/
static inline int mcp73871_powersupply(FAR struct mcp73871_dev_s *priv,
int current)
{
/* This chip doesn't support setting current limit by software */
return OK;
}
/****************************************************************************
* Name: mcp73871_setvolt
*
* Description:
* Set the voltage level to charge the battery. Voltage value in mV.
*
****************************************************************************/
static inline int mcp73871_setvolt(FAR struct mcp73871_dev_s *priv,
int volts)
{
/* This chip doesn't support setting voltage by software */
return OK;
}
/****************************************************************************
* Name: mcp73871_setcurr
*
* Description:
* Set the current to charge the battery. Current value in mA.
*
****************************************************************************/
static inline int mcp73871_setcurr(FAR struct mcp73871_dev_s *priv,
int current)
{
/* This chip doesn't support setting current by software */
return OK;
}
/****************************************************************************
* Name: mcp73871_voltage
*
* Description:
* Set battery charger voltage
*
****************************************************************************/
static int mcp73871_voltage(FAR struct battery_charger_dev_s *dev, int value)
{
/* This chip doesn't support setting voltage by software */
return OK;
}
/****************************************************************************
* Name: mcp73871_current
*
* Description:
* Set the battery charger current rate for charging
*
****************************************************************************/
static int mcp73871_current(FAR struct battery_charger_dev_s *dev, int value)
{
/* This chip doesn't support setting current rate by software */
return OK;
}
/****************************************************************************
* Name: mcp73871_input_current
*
* Description:
* Set the power-supply input current limit
*
****************************************************************************/
static int mcp73871_input_current(FAR struct battery_charger_dev_s *dev,
int value)
{
/* This chip doesn't support setting input current limit by software */
return OK;
}
/****************************************************************************
* Name: mcp73871_operate
*
* Description:
* Do miscellaneous battery ioctl()
*
****************************************************************************/
static int mcp73871_operate(FAR struct battery_charger_dev_s *dev,
uintptr_t param)
{
return -ENOSYS;
}
/****************************************************************************
* Public Functions
****************************************************************************/
/****************************************************************************
* Name: mcp73871_initialize
*
* Description:
* Initialize the BQ2425x battery driver and return an instance of the
* lower_half interface that may be used with battery_charger_register();
*
* This driver requires:
*
* CONFIG_BATTERY_CHARGER - Upper half battery driver support
*
* Input Parameters:
* config - The config structure with function pointers to read/write.
*
* Returned Value:
* A pointer to the initialized lower-half driver instance. A NULL
* pointer is returned on a failure to initialize the BQ2425x lower half.
*
****************************************************************************/
FAR struct battery_charger_dev_s *
mcp73871_initialize(FAR struct mcp73871_config_s *config)
{
FAR struct mcp73871_dev_s *priv;
/* Allocate the MCP73871 device structure */
priv = (FAR struct mcp73871_dev_s *)
kmm_zalloc(sizeof(struct mcp73871_dev_s));
if (priv)
{
/* Initialize the MCP73871 device structure */
priv->dev.ops = &g_mcp73871ops;
priv->config = config;
/* Enable the battery charge */
priv->config->set_chg_ce(true);
}
return (FAR struct battery_charger_dev_s *)priv;
}
#endif /* CONFIG_BATTERY_CHARGER */
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