mirror of
https://git.kernel.org/pub/scm/linux/kernel/git/chenhuacai/linux-loongson
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power: supply: add support for MAX1720x standalone fuel gauge
The MAX17201 monitors a single cell pack. The MAX17205 monitors and balances a 2S or 3S pack or monitors a multiple-series cell pack. Both devices use a I2C interface. Signed-off-by: Dimitri Fedrau <dima.fedrau@gmail.com> Link: https://lore.kernel.org/r/20240702090308.8848-3-dima.fedrau@gmail.com Signed-off-by: Sebastian Reichel <sebastian.reichel@collabora.com>
This commit is contained in:
Dimitri Fedrau
Sebastian Reichel
parent
ad0aa2361c
commit
479b6d0496
@ -411,6 +411,18 @@ config BATTERY_MAX17042
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Driver can be build as a module (max17042_battery).
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config BATTERY_MAX1720X
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tristate "Maxim MAX17201/MAX17205 Fuel Gauge"
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depends on I2C
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select REGMAP_I2C
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help
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MAX1720x is a family of fuel-gauge systems for lithium-ion (Li+)
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batteries in handheld and portable equipment. MAX17201 are
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configured to operate with a single lithium cell, the MAX17205
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can operate with multiple cells.
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Say Y to include support for the MAX17201/MAX17205 Fuel Gauges.
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config BATTERY_MAX1721X
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tristate "MAX17211/MAX17215 standalone gas-gauge"
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depends on W1
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@ -53,6 +53,7 @@ obj-$(CONFIG_CHARGER_DA9150) += da9150-charger.o
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obj-$(CONFIG_BATTERY_DA9150) += da9150-fg.o
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obj-$(CONFIG_BATTERY_MAX17040) += max17040_battery.o
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obj-$(CONFIG_BATTERY_MAX17042) += max17042_battery.o
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obj-$(CONFIG_BATTERY_MAX1720X) += max1720x_battery.o
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obj-$(CONFIG_BATTERY_MAX1721X) += max1721x_battery.o
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obj-$(CONFIG_BATTERY_RT5033) += rt5033_battery.o
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obj-$(CONFIG_CHARGER_RT5033) += rt5033_charger.o
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337
drivers/power/supply/max1720x_battery.c
Normal file
337
drivers/power/supply/max1720x_battery.c
Normal file
@ -0,0 +1,337 @@
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// SPDX-License-Identifier: GPL-2.0+
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/*
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* Fuel gauge driver for Maxim 17201/17205
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*
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* based on max1721x_battery.c
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*
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* Copyright (C) 2024 Liebherr-Electronics and Drives GmbH
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*/
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#include <linux/bitfield.h>
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#include <linux/i2c.h>
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#include <linux/module.h>
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#include <linux/power_supply.h>
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#include <linux/regmap.h>
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#include <asm/unaligned.h>
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/* Nonvolatile registers */
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#define MAX1720X_NRSENSE 0xCF /* RSense in 10^-5 Ohm */
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/* ModelGauge m5 */
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#define MAX172XX_STATUS 0x00 /* Status */
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#define MAX172XX_STATUS_BAT_ABSENT BIT(3) /* Battery absent */
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#define MAX172XX_REPCAP 0x05 /* Average capacity */
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#define MAX172XX_REPSOC 0x06 /* Percentage of charge */
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#define MAX172XX_TEMP 0x08 /* Temperature */
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#define MAX172XX_CURRENT 0x0A /* Actual current */
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#define MAX172XX_AVG_CURRENT 0x0B /* Average current */
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#define MAX172XX_TTE 0x11 /* Time to empty */
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#define MAX172XX_AVG_TA 0x16 /* Average temperature */
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#define MAX172XX_CYCLES 0x17
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#define MAX172XX_DESIGN_CAP 0x18 /* Design capacity */
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#define MAX172XX_AVG_VCELL 0x19
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#define MAX172XX_TTF 0x20 /* Time to full */
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#define MAX172XX_DEV_NAME 0x21 /* Device name */
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#define MAX172XX_DEV_NAME_TYPE_MASK GENMASK(3, 0)
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#define MAX172XX_DEV_NAME_TYPE_MAX17201 BIT(0)
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#define MAX172XX_DEV_NAME_TYPE_MAX17205 (BIT(0) | BIT(2))
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#define MAX172XX_QR_TABLE10 0x22
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#define MAX172XX_BATT 0xDA /* Battery voltage */
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#define MAX172XX_ATAVCAP 0xDF
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static const char *const max1720x_manufacturer = "Maxim Integrated";
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static const char *const max17201_model = "MAX17201";
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static const char *const max17205_model = "MAX17205";
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struct max1720x_device_info {
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struct regmap *regmap;
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int rsense;
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};
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/*
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* Model Gauge M5 Algorithm output register
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* Volatile data (must not be cached)
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*/
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static const struct regmap_range max1720x_volatile_allow[] = {
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regmap_reg_range(MAX172XX_STATUS, MAX172XX_CYCLES),
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regmap_reg_range(MAX172XX_AVG_VCELL, MAX172XX_TTF),
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regmap_reg_range(MAX172XX_QR_TABLE10, MAX172XX_ATAVCAP),
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};
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static const struct regmap_range max1720x_readable_allow[] = {
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regmap_reg_range(MAX172XX_STATUS, MAX172XX_ATAVCAP),
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};
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static const struct regmap_range max1720x_readable_deny[] = {
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/* unused registers */
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regmap_reg_range(0x24, 0x26),
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regmap_reg_range(0x30, 0x31),
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regmap_reg_range(0x33, 0x34),
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regmap_reg_range(0x37, 0x37),
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regmap_reg_range(0x3B, 0x3C),
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regmap_reg_range(0x40, 0x41),
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regmap_reg_range(0x43, 0x44),
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regmap_reg_range(0x47, 0x49),
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regmap_reg_range(0x4B, 0x4C),
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regmap_reg_range(0x4E, 0xAF),
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regmap_reg_range(0xB1, 0xB3),
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regmap_reg_range(0xB5, 0xB7),
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regmap_reg_range(0xBF, 0xD0),
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regmap_reg_range(0xDB, 0xDB),
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regmap_reg_range(0xE0, 0xFF),
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};
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static const struct regmap_access_table max1720x_readable_regs = {
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.yes_ranges = max1720x_readable_allow,
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.n_yes_ranges = ARRAY_SIZE(max1720x_readable_allow),
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.no_ranges = max1720x_readable_deny,
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.n_no_ranges = ARRAY_SIZE(max1720x_readable_deny),
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};
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static const struct regmap_access_table max1720x_volatile_regs = {
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.yes_ranges = max1720x_volatile_allow,
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.n_yes_ranges = ARRAY_SIZE(max1720x_volatile_allow),
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.no_ranges = max1720x_readable_deny,
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.n_no_ranges = ARRAY_SIZE(max1720x_readable_deny),
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};
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static const struct regmap_config max1720x_regmap_cfg = {
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.reg_bits = 8,
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.val_bits = 16,
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.max_register = MAX172XX_ATAVCAP,
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.val_format_endian = REGMAP_ENDIAN_LITTLE,
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.rd_table = &max1720x_readable_regs,
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.volatile_table = &max1720x_volatile_regs,
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.cache_type = REGCACHE_RBTREE,
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};
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static const enum power_supply_property max1720x_battery_props[] = {
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POWER_SUPPLY_PROP_PRESENT,
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POWER_SUPPLY_PROP_CAPACITY,
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POWER_SUPPLY_PROP_VOLTAGE_NOW,
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POWER_SUPPLY_PROP_CHARGE_FULL_DESIGN,
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POWER_SUPPLY_PROP_CHARGE_AVG,
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POWER_SUPPLY_PROP_TIME_TO_EMPTY_AVG,
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POWER_SUPPLY_PROP_TIME_TO_FULL_AVG,
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POWER_SUPPLY_PROP_TEMP,
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POWER_SUPPLY_PROP_CURRENT_NOW,
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POWER_SUPPLY_PROP_CURRENT_AVG,
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POWER_SUPPLY_PROP_MODEL_NAME,
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POWER_SUPPLY_PROP_MANUFACTURER,
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};
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/* Convert regs value to power_supply units */
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static int max172xx_time_to_ps(unsigned int reg)
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{
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return reg * 5625 / 1000; /* in sec. */
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}
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static int max172xx_percent_to_ps(unsigned int reg)
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{
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return reg / 256; /* in percent from 0 to 100 */
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}
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static int max172xx_voltage_to_ps(unsigned int reg)
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{
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return reg * 1250; /* in uV */
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}
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static int max172xx_capacity_to_ps(unsigned int reg)
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{
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return reg * 500; /* in uAh */
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}
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/*
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* Current and temperature is signed values, so unsigned regs
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* value must be converted to signed type
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*/
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static int max172xx_temperature_to_ps(unsigned int reg)
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{
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int val = (int16_t)reg;
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return val * 10 / 256; /* in tenths of deg. C */
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}
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/*
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* Calculating current registers resolution:
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*
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* RSense stored in 10^-5 Ohm, so mesaurment voltage must be
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* in 10^-11 Volts for get current in uA.
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* 16 bit current reg fullscale +/-51.2mV is 102400 uV.
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* So: 102400 / 65535 * 10^5 = 156252
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*/
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static int max172xx_current_to_voltage(unsigned int reg)
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{
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int val = (int16_t)reg;
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return val * 156252;
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}
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static int max1720x_battery_get_property(struct power_supply *psy,
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enum power_supply_property psp,
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union power_supply_propval *val)
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{
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struct max1720x_device_info *info = power_supply_get_drvdata(psy);
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unsigned int reg_val;
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int ret = 0;
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switch (psp) {
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case POWER_SUPPLY_PROP_PRESENT:
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/*
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* POWER_SUPPLY_PROP_PRESENT will always readable via
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* sysfs interface. Value return 0 if battery not
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* present or unaccesable via I2c.
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*/
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ret = regmap_read(info->regmap, MAX172XX_STATUS, ®_val);
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if (ret < 0) {
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val->intval = 0;
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return 0;
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}
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val->intval = !FIELD_GET(MAX172XX_STATUS_BAT_ABSENT, reg_val);
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break;
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case POWER_SUPPLY_PROP_CAPACITY:
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ret = regmap_read(info->regmap, MAX172XX_REPSOC, ®_val);
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val->intval = max172xx_percent_to_ps(reg_val);
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break;
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case POWER_SUPPLY_PROP_VOLTAGE_NOW:
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ret = regmap_read(info->regmap, MAX172XX_BATT, ®_val);
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val->intval = max172xx_voltage_to_ps(reg_val);
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break;
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case POWER_SUPPLY_PROP_CHARGE_FULL_DESIGN:
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ret = regmap_read(info->regmap, MAX172XX_DESIGN_CAP, ®_val);
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val->intval = max172xx_capacity_to_ps(reg_val);
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break;
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case POWER_SUPPLY_PROP_CHARGE_AVG:
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ret = regmap_read(info->regmap, MAX172XX_REPCAP, ®_val);
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val->intval = max172xx_capacity_to_ps(reg_val);
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break;
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case POWER_SUPPLY_PROP_TIME_TO_EMPTY_AVG:
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ret = regmap_read(info->regmap, MAX172XX_TTE, ®_val);
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val->intval = max172xx_time_to_ps(reg_val);
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break;
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case POWER_SUPPLY_PROP_TIME_TO_FULL_AVG:
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ret = regmap_read(info->regmap, MAX172XX_TTF, ®_val);
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val->intval = max172xx_time_to_ps(reg_val);
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break;
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case POWER_SUPPLY_PROP_TEMP:
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ret = regmap_read(info->regmap, MAX172XX_TEMP, ®_val);
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val->intval = max172xx_temperature_to_ps(reg_val);
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break;
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case POWER_SUPPLY_PROP_CURRENT_NOW:
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ret = regmap_read(info->regmap, MAX172XX_CURRENT, ®_val);
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val->intval = max172xx_current_to_voltage(reg_val) / info->rsense;
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break;
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case POWER_SUPPLY_PROP_CURRENT_AVG:
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ret = regmap_read(info->regmap, MAX172XX_AVG_CURRENT, ®_val);
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val->intval = max172xx_current_to_voltage(reg_val) / info->rsense;
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break;
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case POWER_SUPPLY_PROP_MODEL_NAME:
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ret = regmap_read(info->regmap, MAX172XX_DEV_NAME, ®_val);
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reg_val = FIELD_GET(MAX172XX_DEV_NAME_TYPE_MASK, reg_val);
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if (reg_val == MAX172XX_DEV_NAME_TYPE_MAX17201)
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val->strval = max17201_model;
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else if (reg_val == MAX172XX_DEV_NAME_TYPE_MAX17205)
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val->strval = max17205_model;
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else
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return -ENODEV;
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break;
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case POWER_SUPPLY_PROP_MANUFACTURER:
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val->strval = max1720x_manufacturer;
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break;
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default:
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return -EINVAL;
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}
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return ret;
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}
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static int max1720x_probe_sense_resistor(struct i2c_client *client,
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struct max1720x_device_info *info)
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{
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struct device *dev = &client->dev;
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struct i2c_client *ancillary;
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int ret;
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ancillary = i2c_new_ancillary_device(client, "nvmem", 0xb);
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if (IS_ERR(ancillary)) {
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dev_err(dev, "Failed to initialize ancillary i2c device\n");
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return PTR_ERR(ancillary);
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}
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ret = i2c_smbus_read_word_data(ancillary, MAX1720X_NRSENSE);
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i2c_unregister_device(ancillary);
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if (ret < 0)
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return ret;
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info->rsense = ret;
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if (!info->rsense) {
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dev_warn(dev, "RSense not calibrated, set 10 mOhms!\n");
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info->rsense = 1000; /* in regs in 10^-5 */
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}
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return 0;
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}
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static const struct power_supply_desc max1720x_bat_desc = {
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.name = "max1720x",
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.no_thermal = true,
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.type = POWER_SUPPLY_TYPE_BATTERY,
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.properties = max1720x_battery_props,
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.num_properties = ARRAY_SIZE(max1720x_battery_props),
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.get_property = max1720x_battery_get_property,
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};
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static int max1720x_probe(struct i2c_client *client)
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{
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struct power_supply_config psy_cfg = {};
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struct device *dev = &client->dev;
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struct max1720x_device_info *info;
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struct power_supply *bat;
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int ret;
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info = devm_kzalloc(dev, sizeof(*info), GFP_KERNEL);
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if (!info)
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return -ENOMEM;
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psy_cfg.drv_data = info;
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psy_cfg.fwnode = dev_fwnode(dev);
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info->regmap = devm_regmap_init_i2c(client, &max1720x_regmap_cfg);
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if (IS_ERR(info->regmap))
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return dev_err_probe(dev, PTR_ERR(info->regmap),
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"regmap initialization failed\n");
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ret = max1720x_probe_sense_resistor(client, info);
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if (ret)
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return dev_err_probe(dev, ret,
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"Failed to read sense resistor value\n");
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bat = devm_power_supply_register(dev, &max1720x_bat_desc, &psy_cfg);
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if (IS_ERR(bat))
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return dev_err_probe(dev, PTR_ERR(bat),
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"Failed to register power supply\n");
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return 0;
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}
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static const struct of_device_id max1720x_of_match[] = {
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{ .compatible = "maxim,max17201" },
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{}
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};
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MODULE_DEVICE_TABLE(of, max1720x_of_match);
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static struct i2c_driver max1720x_i2c_driver = {
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.driver = {
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.name = "max1720x",
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.of_match_table = max1720x_of_match,
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},
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.probe = max1720x_probe,
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};
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module_i2c_driver(max1720x_i2c_driver);
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MODULE_LICENSE("GPL");
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MODULE_AUTHOR("Dimitri Fedrau <dima.fedrau@gmail.com>");
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MODULE_DESCRIPTION("Maxim MAX17201/MAX17205 Fuel Gauge IC driver");
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