820 lines
21 KiB
C
820 lines
21 KiB
C
/****************************************************************************
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* drivers/power/battery/bq2425x.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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/* Lower half driver for BQ2425x battery charger
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*
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* The BQ24250/BQ24251 are Li-Ion Battery Charger with Power-Path Management.
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* It can be configured to Input Current Limit up to 2A.
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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 <sys/types.h>
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#include <unistd.h>
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#include <stdint.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/kmalloc.h>
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#include <nuttx/signal.h>
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#include <nuttx/i2c/i2c_master.h>
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#include <nuttx/power/battery_charger.h>
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#include <nuttx/power/battery_ioctl.h>
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#include "bq2425x.h"
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/* This driver requires:
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*
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* CONFIG_BATTERY_CHARGER - Upper half battery driver support
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* CONFIG_I2C - I2C support
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* CONFIG_I2C_BQ2425X - And the driver must be explicitly selected.
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*/
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#if defined(CONFIG_BATTERY_CHARGER) && defined(CONFIG_I2C) && \
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defined(CONFIG_I2C_BQ2425X)
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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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struct bq2425x_dev_s
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{
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/* The common part of the battery driver visible to the upper-half driver */
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struct battery_charger_dev_s dev; /* Battery charger device */
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/* Data fields specific to the lower half BQ2425x driver follow */
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FAR struct i2c_master_s *i2c; /* I2C interface */
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uint8_t addr; /* I2C address */
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uint32_t frequency; /* I2C frequency */
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};
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/****************************************************************************
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* Private Function Prototypes
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****************************************************************************/
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/* I2C support */
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static int bq2425x_getreg8(FAR struct bq2425x_dev_s *priv, uint8_t regaddr,
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FAR uint8_t *regval);
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static int bq2425x_putreg8(FAR struct bq2425x_dev_s *priv, uint8_t regaddr,
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uint8_t regval);
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static inline int bq2425x_getreport(FAR struct bq2425x_dev_s *priv,
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uint8_t *report);
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static inline int bq2425x_reset(FAR struct bq2425x_dev_s *priv);
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static inline int bq2425x_watchdog(FAR struct bq2425x_dev_s *priv,
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bool enable);
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static inline int bq2425x_powersupply(FAR struct bq2425x_dev_s *priv,
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int current);
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static inline int bq2425x_setvolt(FAR struct bq2425x_dev_s *priv,
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int volts);
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static inline int bq2425x_setcurr(FAR struct bq2425x_dev_s *priv,
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int current);
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/* Battery driver lower half methods */
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static int bq2425x_state(FAR struct battery_charger_dev_s *dev,
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FAR int *status);
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static int bq2425x_health(FAR struct battery_charger_dev_s *dev,
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FAR int *health);
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static int bq2425x_online(FAR struct battery_charger_dev_s *dev,
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FAR bool *status);
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static int bq2425x_voltage(FAR struct battery_charger_dev_s *dev,
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int value);
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static int bq2425x_current(FAR struct battery_charger_dev_s *dev,
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int value);
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static int bq2425x_input_current(FAR struct battery_charger_dev_s *dev,
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int value);
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static int bq2425x_operate(FAR struct battery_charger_dev_s *dev,
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uintptr_t param);
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/****************************************************************************
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* Private Data
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****************************************************************************/
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static const struct battery_charger_operations_s g_bq2425xops =
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{
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bq2425x_state,
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bq2425x_health,
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bq2425x_online,
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bq2425x_voltage,
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bq2425x_current,
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bq2425x_input_current,
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bq2425x_operate
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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: bq2425x_getreg8
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*
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* Description:
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* Read a 8-bit value from a BQ2425x register pair.
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*
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* START <I2C write address> ACK <Reg address> ACK
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* REPEATED-START <I2C read address> ACK Data0 ACK Data1 NO-ACK STOP
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*
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****************************************************************************/
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static int bq2425x_getreg8(FAR struct bq2425x_dev_s *priv, uint8_t regaddr,
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FAR uint8_t *regval)
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{
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struct i2c_config_s config;
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uint8_t val;
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int ret;
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/* Set up the I2C configuration */
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config.frequency = priv->frequency;
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config.address = priv->addr;
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config.addrlen = 7;
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/* Write the register address */
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ret = i2c_write(priv->i2c, &config, ®addr, 1);
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if (ret < 0)
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{
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baterr("ERROR: i2c_write failed: %d\n", ret);
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return ret;
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}
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/* Restart and read 8-bits from the register */
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ret = i2c_read(priv->i2c, &config, &val, 1);
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if (ret < 0)
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{
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baterr("ERROR: i2c_read failed: %d\n", ret);
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return ret;
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}
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/* Copy 8-bit value to be returned */
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*regval = val;
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return OK;
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}
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/****************************************************************************
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* Name: bq2425x_putreg8
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*
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* Description:
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* Write a 8-bit value to a BQ2425x register pair.
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*
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* START <I2C write address> ACK <Reg address> ACK Data0 ACK Data1 ACK STOP
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*
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****************************************************************************/
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static int bq2425x_putreg8(FAR struct bq2425x_dev_s *priv, uint8_t regaddr,
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uint8_t regval)
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{
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struct i2c_config_s config;
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uint8_t buffer[2];
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/* Set up the I2C configuration */
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config.frequency = priv->frequency;
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config.address = priv->addr;
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config.addrlen = 7;
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batinfo("addr: %02x regval: %08x\n", regaddr, regval);
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/* Set up a 3 byte message to send */
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buffer[0] = regaddr;
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buffer[1] = regval;
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/* Write the register address followed by the data (no RESTART) */
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return i2c_write(priv->i2c, &config, buffer, 2);
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}
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/****************************************************************************
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* Name: bq2425x_getreport
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*
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* Description:
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* Read the BQ2425X Register #1 (status and fault)
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*
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****************************************************************************/
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static inline int bq2425x_getreport(FAR struct bq2425x_dev_s *priv,
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FAR uint8_t *report)
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{
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uint8_t regval = 0;
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int ret;
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ret = bq2425x_getreg8(priv, BQ2425X_REG_1, ®val);
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if (ret == OK)
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{
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*report = regval;
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}
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return ret;
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}
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/****************************************************************************
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* Name: bq2425x_reset
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*
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* Description:
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* Reset the BQ2425x
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*
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****************************************************************************/
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static inline int bq2425x_reset(FAR struct bq2425x_dev_s *priv)
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{
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int ret;
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uint8_t regval;
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/* Read current register value */
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ret = bq2425x_getreg8(priv, BQ2425X_REG_2, ®val);
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if (ret < 0)
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{
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baterr("ERROR: Error reading from BQ2425X! Error = %d\n", ret);
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return ret;
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}
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/* Send reset command */
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regval |= BQ2425X_RESET;
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ret = bq2425x_putreg8(priv, BQ2425X_REG_2, regval);
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if (ret < 0)
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{
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baterr("ERROR: Error writing to BQ2425X! Error = %d\n", ret);
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return ret;
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}
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/* Wait a little bit to clear registers */
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nxsig_usleep(500);
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/* There is a BUG in BQ2425X the RESET bit is always read as 1 */
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regval &= ~(BQ2425X_RESET);
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ret = bq2425x_putreg8(priv, BQ2425X_REG_2, regval);
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if (ret < 0)
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{
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baterr("ERROR: Error writing to BQ2425X! Error = %d\n", ret);
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return ret;
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}
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return OK;
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}
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/****************************************************************************
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* Name: bq2425x_watchdog
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*
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* Description:
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* Enable/Disable the BQ2425x watchdog
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*
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****************************************************************************/
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static inline int bq2425x_watchdog(FAR struct bq2425x_dev_s *priv,
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bool enable)
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{
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int ret;
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uint8_t regval;
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ret = bq2425x_getreg8(priv, BQ2425X_REG_1, ®val);
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if (ret < 0)
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{
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baterr("ERROR: Error reading from BQ2425X! Error = %d\n", ret);
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return ret;
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}
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if (enable)
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{
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regval |= BQ2425X_WD_EN;
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}
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else
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{
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regval &= ~(BQ2425X_WD_EN);
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}
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ret = bq2425x_putreg8(priv, BQ2425X_REG_1, regval);
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if (ret < 0)
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{
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baterr("ERROR: Error writing to BQ2425X! Error = %d\n", ret);
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return ret;
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}
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return OK;
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}
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/****************************************************************************
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* Name: bq2425x_state
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*
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* Description:
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* Return the current battery state
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*
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****************************************************************************/
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static int bq2425x_state(FAR struct battery_charger_dev_s *dev,
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FAR int *status)
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{
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FAR struct bq2425x_dev_s *priv = (FAR struct bq2425x_dev_s *)dev;
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uint8_t regval = 0;
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int ret;
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ret = bq2425x_getreport(priv, ®val);
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if (ret < 0)
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{
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*status = BATTERY_UNKNOWN;
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return ret;
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}
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regval &= BQ2425X_STAT_MASK;
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/* Is there some fault in the battery? */
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if (regval == BQ2425X_STAT_FAULT)
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{
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*status = BATTERY_FAULT;
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}
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/* Is the charging done? */
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else if (regval == BQ2425X_STAT_CHG_DONE)
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{
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*status = BATTERY_FULL;
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}
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/* Is the charging in progress? */
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else if (regval == BQ2425X_STAT_CHG_PROGRESS)
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{
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*status = BATTERY_CHARGING;
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}
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/* Is the charging ready? */
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else if (regval == BQ2425X_STAT_READY)
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{
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*status = BATTERY_IDLE;
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}
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return OK;
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}
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/****************************************************************************
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* Name: bq2425x_health
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*
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* Description:
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* Return the current battery health state
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*
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* Note: if more than one fault happened the user needs to call this ioctl
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* again to read a new fault, repeat until receive a BATTERY_HEALTH_GOOD.
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*
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****************************************************************************/
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static int bq2425x_health(FAR struct battery_charger_dev_s *dev,
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FAR int *health)
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{
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FAR struct bq2425x_dev_s *priv = (FAR struct bq2425x_dev_s *)dev;
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uint8_t regval = 0;
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int ret;
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ret = bq2425x_getreport(priv, ®val);
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if (ret < 0)
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{
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*health = BATTERY_HEALTH_UNKNOWN;
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return ret;
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}
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regval &= BQ2425X_FAULT_MASK;
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switch (regval)
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{
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case BQ2425X_FAULT_NORMAL:
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*health = BATTERY_HEALTH_GOOD;
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break;
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case BQ2425X_FAULT_SLEEP:
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case BQ2425X_FAULT_INP_OVP:
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case BQ2425X_FAULT_INP_UVLO:
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case BQ2425X_FAULT_ISET_SHORT:
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case BQ2425X_FAULT_INP_LDO_LOW:
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*health = BATTERY_HEALTH_UNSPEC_FAIL;
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break;
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case BQ2425X_FAULT_BAT_OVP:
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*health = BATTERY_HEALTH_OVERVOLTAGE;
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break;
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case BQ2425X_FAULT_BAT_TEMP:
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case BQ2425X_FAULT_THERM_SHUT:
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*health = BATTERY_HEALTH_OVERHEAT;
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break;
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case BQ2425X_FAULT_TIMER:
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*health = BATTERY_HEALTH_SAFE_TMR_EXP;
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break;
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case BQ2425X_FAULT_NO_BATTERY:
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*health = BATTERY_HEALTH_DISCONNECTED;
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break;
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default:
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*health = BATTERY_HEALTH_UNKNOWN;
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break;
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}
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return OK;
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}
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/****************************************************************************
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* Name: bq2425x_online
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*
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* Description:
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* Return true if the battery is online
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*
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****************************************************************************/
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static int bq2425x_online(FAR struct battery_charger_dev_s *dev,
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FAR bool *status)
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{
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/* There is no concept of online/offline in this driver */
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*status = true;
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return OK;
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}
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/****************************************************************************
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* Name: bq2425x_powersupply
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*
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* Description:
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* Set the Power Supply Current Limit.
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*
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****************************************************************************/
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static inline int bq2425x_powersupply(FAR struct bq2425x_dev_s *priv,
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int current)
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{
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uint8_t regval;
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int idx;
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int ret;
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switch (current)
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{
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case BATTERY_INPUT_CURRENT_EXT_LIM:
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idx = BQ2425X_INP_CURR_EXT_ILIM;
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break;
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case 100:
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idx = BQ2425X_INP_CURR_LIM_100MA;
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break;
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case 150:
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idx = BQ2425X_INP_CURR_LIM_150MA;
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break;
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case 500:
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idx = BQ2425X_INP_CURR_LIM_500MA;
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break;
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case 900:
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idx = BQ2425X_INP_CURR_LIM_900MA;
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break;
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case 1500:
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idx = BQ2425X_INP_CURR_LIM_1500MA;
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break;
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case 2000:
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idx = BQ2425X_INP_CURR_LIM_2000MA;
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break;
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default:
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baterr("ERROR: Current not supported, setting default to 100mA!\n");
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idx = BQ2425X_INP_CURR_LIM_100MA;
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break;
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}
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/* Read current register */
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ret = bq2425x_getreg8(priv, BQ2425X_REG_2, ®val);
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if (ret < 0)
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{
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baterr("ERROR: Error reading from BQ2425X! Error = %d\n", ret);
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return ret;
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}
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/* Clear previous current and set new value */
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regval &= ~(BQ2425X_INP_CURR_LIM_MASK);
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regval |= idx;
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/* Also clear Reset bit to avoid the resetting BUG */
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regval &= ~(BQ2425X_RESET);
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ret = bq2425x_putreg8(priv, BQ2425X_REG_2, regval);
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if (ret < 0)
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{
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baterr("ERROR: Error writing to BQ2425X! Error = %d\n", ret);
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return ret;
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}
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return OK;
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}
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/****************************************************************************
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* Name: bq2425x_setvolt
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*
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* Description:
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* Set the voltage level to charge the battery. Voltage value in mV.
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*
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****************************************************************************/
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static inline int bq2425x_setvolt(FAR struct bq2425x_dev_s *priv, int volts)
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{
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uint8_t regval;
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int idx;
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int ret;
|
|
|
|
/* Verify if voltage is in the acceptable range */
|
|
|
|
if (volts < BQ2425X_VOLT_MIN || volts > BQ2425X_VOLT_MAX)
|
|
{
|
|
baterr("ERROR: Voltage %d mV is out of range.\n", volts);
|
|
return -EINVAL;
|
|
}
|
|
|
|
ret = bq2425x_getreg8(priv, BQ2425X_REG_3, ®val);
|
|
if (ret < 0)
|
|
{
|
|
baterr("ERROR: Error reading from BQ2425X! Error = %d\n", ret);
|
|
return ret;
|
|
}
|
|
|
|
/* Voltage starts at 3500mV and increases in steps of 20mV */
|
|
|
|
idx = volts - BQ2425X_VOLT_MIN;
|
|
idx = idx / 20;
|
|
|
|
/* Clear previous voltage */
|
|
|
|
regval &= ~(BQ2425X_BAT_VOLT_MASK);
|
|
regval |= (idx << BQ2425X_BAT_VOLT_SHIFT);
|
|
|
|
ret = bq2425x_putreg8(priv, BQ2425X_REG_3, regval);
|
|
if (ret < 0)
|
|
{
|
|
baterr("ERROR: Error writing to BQ2425X! Error = %d\n", ret);
|
|
return ret;
|
|
}
|
|
|
|
return OK;
|
|
}
|
|
|
|
/****************************************************************************
|
|
* Name: bq2425x_setcurr
|
|
*
|
|
* Description:
|
|
* Set the current to charge the battery. Current value in mA.
|
|
*
|
|
****************************************************************************/
|
|
|
|
static inline int bq2425x_setcurr(FAR struct bq2425x_dev_s *priv,
|
|
int current)
|
|
{
|
|
uint8_t regval;
|
|
int idx;
|
|
int ret;
|
|
|
|
/* Verify if current is in the acceptable range */
|
|
|
|
if (current < BQ2425X_CURR_MIN || current > BQ2425X_CURR_MAX)
|
|
{
|
|
baterr("ERROR: Current %d mA is out of range.\n", current);
|
|
return -EINVAL;
|
|
}
|
|
|
|
ret = bq2425x_getreg8(priv, BQ2425X_REG_4, ®val);
|
|
if (ret < 0)
|
|
{
|
|
baterr("ERROR: Error reading from BQ2425X! Error = %d\n", ret);
|
|
return ret;
|
|
}
|
|
|
|
/* Current starts at 500mV and increases in steps of 50mA */
|
|
|
|
idx = current - BQ2425X_CURR_MIN;
|
|
idx = idx / 50;
|
|
|
|
/* Clear previous current and set new value */
|
|
|
|
regval &= ~(BQ2425X_CHG_CURRENT_MASK);
|
|
regval |= (idx << BQ2425X_CHG_CURRENT_SHIFT);
|
|
|
|
ret = bq2425x_putreg8(priv, BQ2425X_REG_4, regval);
|
|
if (ret < 0)
|
|
{
|
|
baterr("ERROR: Error writing to BQ2425X! Error = %d\n", ret);
|
|
return ret;
|
|
}
|
|
|
|
return OK;
|
|
}
|
|
|
|
/****************************************************************************
|
|
* Name: bq2425x_voltage
|
|
*
|
|
* Description:
|
|
* Set battery charger voltage
|
|
*
|
|
****************************************************************************/
|
|
|
|
static int bq2425x_voltage(FAR struct battery_charger_dev_s *dev, int value)
|
|
{
|
|
FAR struct bq2425x_dev_s *priv = (FAR struct bq2425x_dev_s *)dev;
|
|
int ret;
|
|
|
|
/* Set voltage to battery charger */
|
|
|
|
ret = bq2425x_setvolt(priv, value);
|
|
if (ret < 0)
|
|
{
|
|
baterr("ERROR: Error setting voltage to BQ2425X! Error = %d\n", ret);
|
|
return ret;
|
|
}
|
|
|
|
return OK;
|
|
}
|
|
|
|
/****************************************************************************
|
|
* Name: bq2425x_current
|
|
*
|
|
* Description:
|
|
* Set the battery charger current rate for charging
|
|
*
|
|
****************************************************************************/
|
|
|
|
static int bq2425x_current(FAR struct battery_charger_dev_s *dev, int value)
|
|
{
|
|
FAR struct bq2425x_dev_s *priv = (FAR struct bq2425x_dev_s *)dev;
|
|
int ret;
|
|
|
|
/* Set current to battery charger */
|
|
|
|
ret = bq2425x_setcurr(priv, value);
|
|
if (ret < 0)
|
|
{
|
|
baterr("ERROR: Error setting current to BQ2425X! Error = %d\n", ret);
|
|
return ret;
|
|
}
|
|
|
|
return OK;
|
|
}
|
|
|
|
/****************************************************************************
|
|
* Name: bq2425x_input_current
|
|
*
|
|
* Description:
|
|
* Set the power-supply input current limit
|
|
*
|
|
****************************************************************************/
|
|
|
|
static int bq2425x_input_current(FAR struct battery_charger_dev_s *dev,
|
|
int value)
|
|
{
|
|
FAR struct bq2425x_dev_s *priv = (FAR struct bq2425x_dev_s *)dev;
|
|
int ret;
|
|
|
|
ret = bq2425x_powersupply(priv, value);
|
|
if (ret < 0)
|
|
{
|
|
baterr("ERROR: Failed to set BQ2425x power supply: %d\n", ret);
|
|
return ret;
|
|
}
|
|
|
|
return OK;
|
|
}
|
|
|
|
/****************************************************************************
|
|
* Name: bq2425x_operate
|
|
*
|
|
* Description:
|
|
* Do miscellaneous battery ioctl()
|
|
*
|
|
****************************************************************************/
|
|
|
|
static int bq2425x_operate(FAR struct battery_charger_dev_s *dev,
|
|
uintptr_t param)
|
|
{
|
|
return -ENOSYS;
|
|
}
|
|
|
|
/****************************************************************************
|
|
* Public Functions
|
|
****************************************************************************/
|
|
|
|
/****************************************************************************
|
|
* Name: bq2425x_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
|
|
* CONFIG_I2C - I2C support
|
|
* CONFIG_I2C_BQ2425X - And the driver must be explicitly selected.
|
|
*
|
|
* Input Parameters:
|
|
* i2c - An instance of the I2C interface to use to communicate with
|
|
* the BQ2425x
|
|
* addr - The I2C address of the BQ2425x (Better be 0x6a)
|
|
* frequency - The I2C frequency
|
|
* current - The input current our power-supply can offer to charger
|
|
*
|
|
* 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 *
|
|
bq2425x_initialize(FAR struct i2c_master_s *i2c, uint8_t addr,
|
|
uint32_t frequency, int current)
|
|
{
|
|
FAR struct bq2425x_dev_s *priv;
|
|
int ret;
|
|
|
|
/* Initialize the BQ2425x device structure */
|
|
|
|
priv = kmm_zalloc(sizeof(struct bq2425x_dev_s));
|
|
if (priv)
|
|
{
|
|
/* Initialize the BQ2425x device structure */
|
|
|
|
priv->dev.ops = &g_bq2425xops;
|
|
priv->i2c = i2c;
|
|
priv->addr = addr;
|
|
priv->frequency = frequency;
|
|
|
|
/* Reset the BQ2425x */
|
|
|
|
ret = bq2425x_reset(priv);
|
|
if (ret < 0)
|
|
{
|
|
baterr("ERROR: Failed to reset the BQ2425x: %d\n", ret);
|
|
kmm_free(priv);
|
|
return NULL;
|
|
}
|
|
|
|
/* Disable watchdog otherwise BQ2425x returns to StandAlone mode */
|
|
|
|
ret = bq2425x_watchdog(priv, false);
|
|
if (ret < 0)
|
|
{
|
|
baterr("ERROR: Failed to disable BQ2425x watchdog: %d\n", ret);
|
|
kmm_free(priv);
|
|
return NULL;
|
|
}
|
|
|
|
/* Define the current that our power supply can offer to the charger. */
|
|
|
|
ret = bq2425x_powersupply(priv, current);
|
|
if (ret < 0)
|
|
{
|
|
baterr("ERROR: Failed to set BQ2425x power supply: %d\n", ret);
|
|
kmm_free(priv);
|
|
return NULL;
|
|
}
|
|
}
|
|
|
|
return (FAR struct battery_charger_dev_s *)priv;
|
|
}
|
|
|
|
#endif /* CONFIG_BATTERY_CHARGER && CONFIG_I2C && CONFIG_I2C_BQ2425X */
|