bd4e8e19d3
and fix the wrong correction
574 lines
18 KiB
C
574 lines
18 KiB
C
/****************************************************************************
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* drivers/power/max1704x.c
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* Lower half driver for MAX1704x battery fuel gauge
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*
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* Copyright (C) 2012, 2016 Gregory Nutt. All rights reserved.
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* Author: Gregory Nutt <gnutt@nuttx.org>
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*
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* Redistribution and use in source and binary forms, with or without
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* modification, are permitted provided that the following conditions
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* are met:
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*
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* 1. Redistributions of source code must retain the above copyright
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* notice, this list of conditions and the following disclaimer.
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* 2. Redistributions in binary form must reproduce the above copyright
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* notice, this list of conditions and the following disclaimer in
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* the documentation and/or other materials provided with the
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* distribution.
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* 3. Neither the name NuttX nor the names of its contributors may be
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* used to endorse or promote products derived from this software
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* without specific prior written permission.
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*
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* THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
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* "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
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* LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS
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* FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE
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* COPYRIGHT OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT,
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* INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING,
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* BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS
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* OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED
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* AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
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* LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN
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* ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
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* POSSIBILITY OF SUCH DAMAGE.
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*
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****************************************************************************/
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/* "The MAX17040/MAX17041 are ultra-compact, low-cost, host-side fuel-gauge
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* systems for lithium-ion (Li+) batteries in handheld and portable equipment.
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* The MAX17040 is configured to operate with a single lithium cell and the
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* MAX17041 is configured for a dual-cell 2S pack.
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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 <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/i2c/i2c_master.h>
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#include <nuttx/power/battery_gauge.h>
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/* This driver requires:
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*
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* CONFIG_BATTERY - Upper half battery gauge driver support
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* CONFIG_I2C - I2C support
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* CONFIG_I2C_MAX1704X - And the driver must be explicitly selected.
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*/
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#if defined(CONFIG_BATTERY) && defined(CONFIG_I2C) && defined(CONFIG_I2C_MAX1704X)
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/****************************************************************************
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* Pre-processor Definitions
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****************************************************************************/
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/* Configuration ************************************************************/
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/* CONFIG_I2C_MAX17040 or CONFIG_I2C_MAX17041 - The driver must know which
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* chip is on the board in order to scale the voltage correctly.
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*/
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#if !defined(CONFIG_I2C_MAX17040) && !defined(CONFIG_I2C_MAX17041)
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# warning "Assuming CONFIG_I2C_MAX17040"
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# define CONFIG_I2C_MAX17040 1
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#endif
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/* MAX1704x Register Definitions ********************************************/
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/* "All host interaction with the MAX17040/MAX17041 is handled by writing to
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* and reading from register locations. The MAX17040/MAX17041 have six 16-bit
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* registers: SOC, VCELL, MODE, VERSION, RCOMP, and COMMAND. Register reads
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* and writes are only valid if all 16 bits are transferred..."
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*/
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/* "VCELL Register. Battery voltage is measured at the CELL pin input with
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* respect to GND over a 0 to 5.00V range for the MAX17040 and 0 to 10.00V
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* for the MAX17041 with resolutions of 1.25mV and 2.50mV, respectively..."
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*/
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#define MAX1407X_VCELL_ADDR 0x02 /* Bits 4-15: Bits 0-11 of the battery voltage */
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/* VCELL conversion macros */
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#define MAX14700_VCELL_CONV 82 /* 0.00125 v * 65536 */
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#define MAX14070_VCELL(v) ((b16_t)(v) * MAX14700_VCELL_CONV)
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#define MAX14701_VCELL_CONV 163 /* 0.0025 v * 65536 */
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#define MAX14071_VCELL(v) ((b16_t)(v) * MAX14701_VCELL_CONV)
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#ifdef CONFIG_I2C_MAX17040
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# define MAX1407X_VCELL(v) MAX14070_VCELL(v)
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#else
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# define MAX1407X_VCELL(v) MAX14071_VCELL(v)
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#endif
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/* "SOC Register. The SOC register is a read-only register that displays the
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* state of charge of the cell as calculated by the ModelGauge algorithm. The
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* result is displayed as a percentage of the cell<6C>s full capacity...
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*
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* "...Units of % can be directly determined by observing only the high byte
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* of the SOC register. The low byte provides additional resolution in units
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* 1/256%.
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*/
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#define MAX1407X_SOC_ADDR 0x04 /* Bits 0-15: Full SOC */
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/* SoC conversion macros */
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#define MAX1407X_SOC(s) ((b16_t)(s) << 8)
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#define MAX17040_SOC_FULL itob16(95) /* We say full if Soc >= 95% */
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/* "MODE Register.The MODE register allows the host processor to send special
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* commands to the IC."
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*/
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#define MAX1407X_MODE_ADDR 0x06 /* Bits 0-15: 16-bit MODE */
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/* Supported modes */
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#define MAX1407X_MODE_QUICKSTART 0x4000
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/* "The VERSION register is a read-only register that contains a value
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* indicating the production version of the MAX17040/MAX17041."
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*/
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#define MAX1407X_VERSION_ADDR 0x08 /* Bits 0-15: 16-bit VERSION */
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/* "RCOMP Register. RCOMP is a 16-bit value used to compensate the ModelGauge
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* algorithm. RCOMP can be adjusted to optimize performance for different
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* lithium chemistries or different operating temperatures... The factory-
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* default value for RCOMP is 9700h."
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*/
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#define MAX1407X_RCOMP_ADDR 0x0c /* Bits 0-15: 16-bit RCOMP */
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/* "COMMAND Register. The COMMAND register allows the host processor to send
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* special commands to the IC..."
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*/
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#define MAX1407X_COMMAND_ADDR 0xfe /* Bits 0-7: 16-bit COMMAND */
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/* Supported copmmands */
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#define MAX1407X_COMMAND_POR 0x5400
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/* Debug ********************************************************************/
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#ifdef CONFIG_DEBUG_MAX1704X
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# define baterr _err
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#else
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# ifdef CONFIG_CPP_HAVE_VARARGS
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# define baterr(x...)
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# else
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# define baterr (void)
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# endif
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#endif
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/****************************************************************************
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* Private
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****************************************************************************/
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struct max1704x_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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FAR const struct battery_gauge_operations_s *ops; /* Battery operations */
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sem_t batsem; /* Enforce mutually exclusive access */
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/* Data fields specific to the lower half MAX1704x 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 max1704x_getreg16(FAR struct max1704x_dev_s *priv, uint8_t regaddr,
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FAR uint16_t *regval);
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static int max1704x_putreg16(FAR struct max1704x_dev_s *priv, uint8_t regaddr,
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uint16_t regval);
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static inline int max1704x_getvcell(FAR struct max1704x_dev_s *priv,
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b16_t *vcell);
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static inline int max1704x_getsoc(FAR struct max1704x_dev_s *priv,
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b16_t *soc);
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static inline int max1704x_setquikstart(FAR struct max1704x_dev_s *priv);
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static inline int max1704x_getversion(FAR struct max1704x_dev_s *priv,
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uint16_t *version);
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static inline int max1704x_reset(FAR struct max1704x_dev_s *priv);
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/* Battery driver lower half methods */
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static int max1704x_state(struct battery_gauge_dev_s *dev, int *status);
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static int max1704x_online(struct battery_gauge_dev_s *dev, bool *status);
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static int max1704x_voltage(struct battery_gauge_dev_s *dev, b16_t *value);
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static int max1704x_capacity(struct battery_gauge_dev_s *dev, b16_t *value);
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/****************************************************************************
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* Private Data
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****************************************************************************/
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static const struct battery_gauge_operations_s g_max1704xops =
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{
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max1704x_state,
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max1704x_online,
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max1704x_voltage,
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max1704x_capacity
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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: max1704x_getreg16
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*
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* Description:
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* Read a 16-bit value from a MAX1704x 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 max1704x_getreg16(FAR struct max1704x_dev_s *priv, uint8_t regaddr,
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FAR uint16_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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int ret;
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/* Set up the configuration and perform the write-read operation */
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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("i2c_write failed: %d\n", ret);
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return ret;
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}
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/* Restart and read 16-bits from the register */
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ret = i2c_read(priv->i2c, &config, buffer, 2);
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if (ret < 0)
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{
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baterr("i2c_read failed: %d\n", ret);
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return ret;
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}
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/* Return the 16-bit value */
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return (uint16_t)buffer[0] << 8 | (uint16_t)buffer[1];
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}
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/****************************************************************************
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* Name: max1704x_putreg16
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*
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* Description:
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* Write a 16-bit value to a MAX1704x 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 max1704x_putreg16(FAR struct max1704x_dev_s *priv, uint8_t regaddr,
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uint16_t regval)
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{
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struct i2c_config_s config;
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uint8_t buffer[3];
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baterr("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] = (uint8_t)(regval >> 8);
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buffer[2] = (uint8_t)(regval & 0xff);
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/* Set up the configuration and perform the write-read operation */
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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 followed by the data (no RESTART) */
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return i2c_write(priv->i2c, &config, buffer, 3);
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}
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/****************************************************************************
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* Name: max1704x_getvcell
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*
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* Description:
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* Read the VCELL register and scale the returned value
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*
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****************************************************************************/
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static inline int max1704x_getvcell(FAR struct max1704x_dev_s *priv,
|
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b16_t *vcell)
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{
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uint16_t regval = 0;
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int ret;
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|
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ret = max1704x_getreg16(priv, MAX1407X_VCELL_ADDR, ®val);
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if (ret == OK)
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{
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*vcell = MAX1407X_VCELL(regval);
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||
}
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||
|
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return ret;
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||
}
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||
|
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/****************************************************************************
|
||
* Name: max1704x_getsoc
|
||
*
|
||
* Description:
|
||
* Read the SOC register and scale the returned value
|
||
*
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||
****************************************************************************/
|
||
|
||
static inline int max1704x_getsoc(FAR struct max1704x_dev_s *priv,
|
||
b16_t *soc)
|
||
{
|
||
uint16_t regval = 0;
|
||
int ret;
|
||
|
||
ret = max1704x_getreg16(priv, MAX1407X_VCELL_ADDR, ®val);
|
||
if (ret == OK)
|
||
{
|
||
*soc = MAX1407X_SOC(regval);
|
||
}
|
||
|
||
return ret;
|
||
}
|
||
|
||
/****************************************************************************
|
||
* Name: max1704x_setquikstart
|
||
*
|
||
* Description:
|
||
* Set Quickstart mode
|
||
*
|
||
****************************************************************************/
|
||
|
||
static inline int max1704x_setquikstart(FAR struct max1704x_dev_s *priv)
|
||
{
|
||
return max1704x_putreg16(priv, MAX1407X_MODE_ADDR, MAX1407X_MODE_QUICKSTART);
|
||
}
|
||
|
||
/****************************************************************************
|
||
* Name: max1704x_getversion
|
||
*
|
||
* Description:
|
||
* Read the SOC register and scale the returned value
|
||
*
|
||
****************************************************************************/
|
||
|
||
static inline int max1704x_getversion(FAR struct max1704x_dev_s *priv,
|
||
uint16_t *version)
|
||
{
|
||
return max1704x_getreg16(priv, MAX1407X_VCELL_ADDR, version);
|
||
}
|
||
|
||
/****************************************************************************
|
||
* Name: max1704x_setrcomp
|
||
*
|
||
* Description:
|
||
* Set Quickstart mode
|
||
*
|
||
****************************************************************************/
|
||
|
||
static inline int max1704x_setrcomp(FAR struct max1704x_dev_s *priv, uint16_t rcomp)
|
||
{
|
||
return max1704x_putreg16(priv, MAX1407X_RCOMP_ADDR, rcomp);
|
||
}
|
||
|
||
/****************************************************************************
|
||
* Name: max1704x_reset
|
||
*
|
||
* Description:
|
||
* Reset the MAX1704x
|
||
*
|
||
****************************************************************************/
|
||
|
||
static inline int max1704x_reset(FAR struct max1704x_dev_s *priv)
|
||
{
|
||
return max1704x_putreg16(priv, MAX1407X_COMMAND_ADDR, MAX1407X_COMMAND_POR);
|
||
}
|
||
|
||
/****************************************************************************
|
||
* Name: max1704x_state
|
||
*
|
||
* Description:
|
||
* Return the current battery state
|
||
*
|
||
****************************************************************************/
|
||
|
||
static int max1704x_state(struct battery_gauge_dev_s *dev, int *status)
|
||
{
|
||
FAR struct max1704x_dev_s *priv = (FAR struct max1704x_dev_s *)dev;
|
||
b16_t soc = 0;
|
||
int ret;
|
||
|
||
/* Only a few of the possible battery states are supported by this driver:
|
||
*
|
||
* BATTERY_UNKNOWN - Returned on error conditions
|
||
* BATTERY_IDLE - This is what will usually be reported
|
||
* BATTERY_FULL - This will be reported if the SoC is greater than 95%
|
||
* BATTERY_CHARGING and BATTERY_DISCHARGING - I don't think this hardware
|
||
* knows anything about current (charging or dischargin).
|
||
*/
|
||
|
||
ret = max1704x_getsoc(priv, &soc);
|
||
if (ret < 0)
|
||
{
|
||
*status = BATTERY_UNKNOWN;
|
||
return ret;
|
||
}
|
||
|
||
/* Is the battery fully charged? */
|
||
|
||
if (soc > MAX17040_SOC_FULL)
|
||
{
|
||
*status = BATTERY_FULL;
|
||
}
|
||
else
|
||
{
|
||
*status = BATTERY_IDLE;
|
||
}
|
||
|
||
return OK;
|
||
}
|
||
|
||
/****************************************************************************
|
||
* Name: max1704x_online
|
||
*
|
||
* Description:
|
||
* Return true if the batter is online
|
||
*
|
||
****************************************************************************/
|
||
|
||
static int max1704x_online(struct battery_gauge_dev_s *dev, bool *status)
|
||
{
|
||
/* There is no concept of online/offline in this driver */
|
||
|
||
*status = true;
|
||
return OK;
|
||
}
|
||
|
||
/****************************************************************************
|
||
* Name: max1704x_voltage
|
||
*
|
||
* Description:
|
||
* Current battery voltage
|
||
*
|
||
****************************************************************************/
|
||
|
||
static int max1704x_voltage(struct battery_gauge_dev_s *dev, b16_t *value)
|
||
{
|
||
FAR struct max1704x_dev_s *priv = (FAR struct max1704x_dev_s *)dev;
|
||
return max1704x_getvcell(priv, value);
|
||
}
|
||
|
||
/****************************************************************************
|
||
* Name: max1704x_capacity
|
||
*
|
||
* Description:
|
||
* Battery capacity
|
||
*
|
||
****************************************************************************/
|
||
|
||
static int max1704x_capacity(struct battery_gauge_dev_s *dev, b16_t *value)
|
||
{
|
||
FAR struct max1704x_dev_s *priv = (FAR struct max1704x_dev_s *)dev;
|
||
return max1704x_getsoc(priv, value);
|
||
}
|
||
|
||
/****************************************************************************
|
||
* Public Functions
|
||
****************************************************************************/
|
||
|
||
/****************************************************************************
|
||
* Name: max1704x_initialize
|
||
*
|
||
* Description:
|
||
* Initialize the MAX1704x battery driver and return an instance of the
|
||
* lower_half interface that may be used with battery_register();
|
||
*
|
||
* This driver requires:
|
||
*
|
||
* CONFIG_BATTERY - Upper half battery driver support
|
||
* CONFIG_I2C - I2C support
|
||
* CONFIG_I2C_MAX1704X - And the driver must be explicitly selected.
|
||
* CONFIG_I2C_MAX17040 or CONFIG_I2C_MAX17041 - The driver must know which
|
||
* chip is on the board in order to scale the voltage correctly.
|
||
*
|
||
* Input Parameters:
|
||
* i2c - An instance of the I2C interface to use to communicate with the MAX1704x
|
||
* addr - The I2C address of the MAX1704x (Better be 0x36).
|
||
* frequency - The I2C frequency
|
||
*
|
||
* Returned Value:
|
||
* A pointer to the initializeed lower-half driver instance. A NULL pointer
|
||
* is returned on a failure to initialize the MAX1704x lower half.
|
||
*
|
||
****************************************************************************/
|
||
|
||
FAR struct battery_gauge_dev_s *max1704x_initialize(FAR struct i2c_master_s *i2c,
|
||
uint8_t addr,
|
||
uint32_t frequency)
|
||
{
|
||
FAR struct max1704x_dev_s *priv;
|
||
#if 0
|
||
int ret;
|
||
#endif
|
||
|
||
/* Initialize the MAX1704x device structure */
|
||
|
||
priv = (FAR struct max1704x_dev_s *)kmm_zalloc(sizeof(struct max1704x_dev_s));
|
||
if (priv)
|
||
{
|
||
/* Initialize the MAX1704x device structure */
|
||
|
||
nxsem_init(&priv->batsem, 0, 1);
|
||
priv->ops = &g_max1704xops;
|
||
priv->i2c = i2c;
|
||
priv->addr = addr;
|
||
priv->frequency = frequency;
|
||
|
||
/* Reset the MAX1704x (mostly just to make sure that we can talk to it) */
|
||
|
||
#if 0
|
||
ret = max1704x_reset(priv);
|
||
if (ret < 0)
|
||
{
|
||
baterr("Failed to reset the MAX1704x: %d\n", ret);
|
||
kmm_free(priv);
|
||
return NULL;
|
||
}
|
||
#endif
|
||
}
|
||
|
||
return (FAR struct battery_gauge_dev_s *)priv;
|
||
}
|
||
|
||
#endif /* CONFIG_BATTERY && CONFIG_I2C && CONFIG_I2C_MAX1704X */
|