* [PATCH v4 3/3] power: supply: Introduce MM8013 fuel gauge driver
2023-09-15 12:45 [PATCH v4 0/3] MM8013 fg driver Konrad Dybcio
2023-09-15 12:45 ` [PATCH v4 1/3] dt-bindings: vendor-prefixes: Add Mitsumi Electric Co., Ltd Konrad Dybcio
2023-09-15 12:45 ` [PATCH v4 2/3] dt-bindings: power: supply: Document Mitsumi MM8013 fuel gauge Konrad Dybcio
@ 2023-09-15 12:45 ` Konrad Dybcio
2023-09-15 19:32 ` [PATCH v4 0/3] MM8013 fg driver Sebastian Reichel
3 siblings, 0 replies; 5+ messages in thread
From: Konrad Dybcio @ 2023-09-15 12:45 UTC (permalink / raw)
To: Rob Herring, Krzysztof Kozlowski, Conor Dooley, Sebastian Reichel,
Konrad Dybcio
Cc: Marijn Suijten, Rob Herring, devicetree, linux-kernel, linux-pm,
Konrad Dybcio
Add a driver for the Mitsumi MM8013 fuel gauge. The driver is a vastly
cleaned up and improved version of the one that shipped in some obscure
Lenovo downstream kernel [1], with some register definitions borrowed from
ChromeOS EC platform code [2].
[1] https://github.com/adazem009/kernel_lenovo_bengal/commit/b6b346427a871715709bd22aae449b9383f3b66b
[2] https://chromium.googlesource.com/chromiumos/platform/ec/+/master/driver/battery/mm8013.h
Signed-off-by: Konrad Dybcio <konrad.dybcio@linaro.org>
---
uevent dump as of v4:
POWER_SUPPLY_NAME=mm8013
POWER_SUPPLY_TYPE=Battery
POWER_SUPPLY_CAPACITY=100
POWER_SUPPLY_CHARGE_FULL=7124000
POWER_SUPPLY_CHARGE_FULL_DESIGN=7500000
POWER_SUPPLY_CURRENT_NOW=0
POWER_SUPPLY_CYCLE_COUNT=27
POWER_SUPPLY_HEALTH=Good
POWER_SUPPLY_PRESENT=1
POWER_SUPPLY_STATUS=Full
POWER_SUPPLY_TEMP=300
POWER_SUPPLY_TIME_TO_EMPTY_AVG=888
POWER_SUPPLY_VOLTAGE_NOW=4402000
---
MAINTAINERS | 5 +
drivers/power/supply/Kconfig | 9 ++
drivers/power/supply/Makefile | 1 +
drivers/power/supply/mm8013.c | 274 ++++++++++++++++++++++++++++++++++++++++++
4 files changed, 289 insertions(+)
diff --git a/MAINTAINERS b/MAINTAINERS
index fa7487b7729b..555403b9f011 100644
--- a/MAINTAINERS
+++ b/MAINTAINERS
@@ -14409,6 +14409,11 @@ W: https://linuxtv.org
T: git git://linuxtv.org/media_tree.git
F: drivers/media/radio/radio-miropcm20*
+MITSUMI MM8013 FG DRIVER
+M: Konrad Dybcio <konradybcio@kernel.org>
+F: Documentation/devicetree/bindings/power/supply/mitsumi,mm8013.yaml
+F: drivers/power/supply/mm8013.c
+
MMP SUPPORT
R: Lubomir Rintel <lkundrak@v3.sk>
L: linux-arm-kernel@lists.infradead.org (moderated for non-subscribers)
diff --git a/drivers/power/supply/Kconfig b/drivers/power/supply/Kconfig
index 0c80c68fb0d7..3ef608d010f9 100644
--- a/drivers/power/supply/Kconfig
+++ b/drivers/power/supply/Kconfig
@@ -952,4 +952,13 @@ config CHARGER_QCOM_SMB2
adds support for the SMB2 switch mode battery charger found
in PMI8998 and related PMICs.
+config FUEL_GAUGE_MM8013
+ tristate "Mitsumi MM8013 fuel gauge driver"
+ depends on I2C
+ help
+ Say Y here to enable the Mitsumi MM8013 fuel gauge driver.
+ It enables the monitoring of many battery parameters, including
+ the state of charge, temperature, cycle count, actual and design
+ capacity, etc.
+
endif # POWER_SUPPLY
diff --git a/drivers/power/supply/Makefile b/drivers/power/supply/Makefile
index a8a9fa6de1e9..ba2c41f060be 100644
--- a/drivers/power/supply/Makefile
+++ b/drivers/power/supply/Makefile
@@ -111,3 +111,4 @@ obj-$(CONFIG_BATTERY_SURFACE) += surface_battery.o
obj-$(CONFIG_CHARGER_SURFACE) += surface_charger.o
obj-$(CONFIG_BATTERY_UG3105) += ug3105_battery.o
obj-$(CONFIG_CHARGER_QCOM_SMB2) += qcom_pmi8998_charger.o
+obj-$(CONFIG_FUEL_GAUGE_MM8013) += mm8013.o
diff --git a/drivers/power/supply/mm8013.c b/drivers/power/supply/mm8013.c
new file mode 100644
index 000000000000..bd8d54d6597f
--- /dev/null
+++ b/drivers/power/supply/mm8013.c
@@ -0,0 +1,274 @@
+// SPDX-License-Identifier: GPL-2.0
+/*
+ * Copyright (c) 2016-2019 The Linux Foundation. All rights reserved.
+ * Copyright (c) 2023, Linaro Limited
+ */
+#include <linux/delay.h>
+#include <linux/i2c.h>
+#include <linux/power_supply.h>
+#include <linux/regmap.h>
+
+#define REG_BATID 0x00 /* This one is very unclear */
+ #define BATID_101 0x0101 /* 107kOhm */
+ #define BATID_102 0x0102 /* 10kOhm */
+#define REG_TEMPERATURE 0x06
+#define REG_VOLTAGE 0x08
+#define REG_FLAGS 0x0a
+ #define MM8013_FLAG_OTC BIT(15)
+ #define MM8013_FLAG_OTD BIT(14)
+ #define MM8013_FLAG_BATHI BIT(13)
+ #define MM8013_FLAG_FC BIT(9)
+ #define MM8013_FLAG_CHG BIT(8)
+ #define MM8013_FLAG_DSG BIT(0)
+#define REG_FULL_CHARGE_CAPACITY 0x0e
+#define REG_AVERAGE_CURRENT 0x14
+#define REG_AVERAGE_TIME_TO_EMPTY 0x16
+#define REG_AVERAGE_TIME_TO_FULL 0x18
+#define REG_CYCLE_COUNT 0x2a
+#define REG_STATE_OF_CHARGE 0x2c
+#define REG_DESIGN_CAPACITY 0x3c
+/* TODO: 0x62-0x68 seem to contain 'MM8013C' in a length-prefixed, non-terminated string */
+
+#define DECIKELVIN_TO_DECIDEGC(t) (t - 2731)
+
+struct mm8013_chip {
+ struct i2c_client *client;
+ struct regmap *regmap;
+};
+
+static int mm8013_checkdevice(struct mm8013_chip *chip)
+{
+ int battery_id, ret;
+ u32 val;
+
+ ret = regmap_write(chip->regmap, REG_BATID, 0x0008);
+ if (ret < 0)
+ return ret;
+
+ regmap_read(chip->regmap, REG_BATID, &val);
+ if (ret < 0)
+ return ret;
+
+ if (val == BATID_102)
+ battery_id = 2;
+ else if (val == BATID_101)
+ battery_id = 1;
+ else
+ return -EINVAL;
+
+ dev_dbg(&chip->client->dev, "battery_id: %d\n", battery_id);
+
+ return 0;
+}
+
+static enum power_supply_property mm8013_battery_props[] = {
+ POWER_SUPPLY_PROP_CAPACITY,
+ POWER_SUPPLY_PROP_CHARGE_FULL,
+ POWER_SUPPLY_PROP_CHARGE_FULL_DESIGN,
+ POWER_SUPPLY_PROP_CURRENT_NOW,
+ POWER_SUPPLY_PROP_CYCLE_COUNT,
+ POWER_SUPPLY_PROP_HEALTH,
+ POWER_SUPPLY_PROP_PRESENT,
+ POWER_SUPPLY_PROP_STATUS,
+ POWER_SUPPLY_PROP_TEMP,
+ POWER_SUPPLY_PROP_TIME_TO_EMPTY_AVG,
+ POWER_SUPPLY_PROP_TIME_TO_FULL_AVG,
+ POWER_SUPPLY_PROP_VOLTAGE_NOW,
+};
+
+static int mm8013_get_property(struct power_supply *psy,
+ enum power_supply_property psp,
+ union power_supply_propval *val)
+{
+ struct mm8013_chip *chip = psy->drv_data;
+ int ret = 0;
+ u32 regval;
+
+ switch (psp) {
+ case POWER_SUPPLY_PROP_CAPACITY:
+ ret = regmap_read(chip->regmap, REG_STATE_OF_CHARGE, ®val);
+ if (ret < 0)
+ return ret;
+
+ val->intval = regval;
+ break;
+ case POWER_SUPPLY_PROP_CHARGE_FULL:
+ ret = regmap_read(chip->regmap, REG_FULL_CHARGE_CAPACITY, ®val);
+ if (ret < 0)
+ return ret;
+
+ val->intval = 1000 * regval;
+ break;
+ case POWER_SUPPLY_PROP_CHARGE_FULL_DESIGN:
+ ret = regmap_read(chip->regmap, REG_DESIGN_CAPACITY, ®val);
+ if (ret < 0)
+ return ret;
+
+ val->intval = 1000 * regval;
+ break;
+ case POWER_SUPPLY_PROP_CURRENT_NOW:
+ ret = regmap_read(chip->regmap, REG_AVERAGE_CURRENT, ®val);
+ if (ret < 0)
+ return ret;
+
+ val->intval = -1000 * (s16)regval;
+ break;
+ case POWER_SUPPLY_PROP_CYCLE_COUNT:
+ ret = regmap_read(chip->regmap, REG_CYCLE_COUNT, ®val);
+ if (ret < 0)
+ return ret;
+
+ val->intval = regval;
+ break;
+ case POWER_SUPPLY_PROP_HEALTH:
+ ret = regmap_read(chip->regmap, REG_FLAGS, ®val);
+ if (ret < 0)
+ return ret;
+
+ if (regval & MM8013_FLAG_BATHI)
+ val->intval = POWER_SUPPLY_HEALTH_OVERVOLTAGE;
+ else if (regval & (MM8013_FLAG_OTD | MM8013_FLAG_OTC))
+ val->intval = POWER_SUPPLY_HEALTH_OVERHEAT;
+ else
+ val->intval = POWER_SUPPLY_HEALTH_GOOD;
+ break;
+ case POWER_SUPPLY_PROP_PRESENT:
+ ret = regmap_read(chip->regmap, REG_TEMPERATURE, ®val);
+ if (ret < 0)
+ return ret;
+
+ val->intval = ((s16)regval > 0);
+ break;
+ case POWER_SUPPLY_PROP_STATUS:
+ ret = regmap_read(chip->regmap, REG_FLAGS, ®val);
+ if (ret < 0)
+ return ret;
+
+ if (regval & MM8013_FLAG_DSG)
+ val->intval = POWER_SUPPLY_STATUS_DISCHARGING;
+ else if (regval & MM8013_FLAG_CHG)
+ val->intval = POWER_SUPPLY_STATUS_CHARGING;
+ else if (regval & MM8013_FLAG_FC)
+ val->intval = POWER_SUPPLY_STATUS_FULL;
+ else
+ val->intval = POWER_SUPPLY_STATUS_UNKNOWN;
+ break;
+ case POWER_SUPPLY_PROP_TEMP:
+ ret = regmap_read(chip->regmap, REG_TEMPERATURE, ®val);
+ if (ret < 0)
+ return ret;
+
+ val->intval = DECIKELVIN_TO_DECIDEGC(regval);
+ break;
+ case POWER_SUPPLY_PROP_TIME_TO_EMPTY_AVG:
+ ret = regmap_read(chip->regmap, REG_AVERAGE_TIME_TO_EMPTY, ®val);
+ if (ret < 0)
+ return ret;
+
+ /* The estimation is not yet ready */
+ if (regval == U16_MAX)
+ return -ENODATA;
+
+ val->intval = regval;
+ break;
+ case POWER_SUPPLY_PROP_TIME_TO_FULL_AVG:
+ ret = regmap_read(chip->regmap, REG_AVERAGE_TIME_TO_FULL, ®val);
+ if (ret < 0)
+ return ret;
+
+ /* The estimation is not yet ready */
+ if (regval == U16_MAX)
+ return -ENODATA;
+
+ val->intval = regval;
+ break;
+ case POWER_SUPPLY_PROP_VOLTAGE_NOW:
+ ret = regmap_read(chip->regmap, REG_VOLTAGE, ®val);
+ if (ret < 0)
+ return ret;
+
+ val->intval = 1000 * regval;
+ break;
+ default:
+ return -EINVAL;
+ }
+
+ return 0;
+}
+
+static const struct power_supply_desc mm8013_desc = {
+ .name = "mm8013",
+ .type = POWER_SUPPLY_TYPE_BATTERY,
+ .properties = mm8013_battery_props,
+ .num_properties = ARRAY_SIZE(mm8013_battery_props),
+ .get_property = mm8013_get_property,
+};
+
+static const struct regmap_config mm8013_regmap_config = {
+ .reg_bits = 8,
+ .val_bits = 16,
+ .max_register = 0x68,
+ .use_single_read = true,
+ .use_single_write = true,
+ .val_format_endian = REGMAP_ENDIAN_LITTLE,
+};
+
+static int mm8013_probe(struct i2c_client *client)
+{
+ struct power_supply_config psy_cfg = {};
+ struct device *dev = &client->dev;
+ struct power_supply *psy;
+ struct mm8013_chip *chip;
+ int ret = 0;
+
+ if (!i2c_check_functionality(client->adapter, I2C_FUNC_SMBUS_WORD_DATA))
+ return dev_err_probe(dev, -EIO,
+ "I2C_FUNC_SMBUS_WORD_DATA not supported\n");
+
+ chip = devm_kzalloc(dev, sizeof(struct mm8013_chip), GFP_KERNEL);
+ if (!chip)
+ return -ENOMEM;
+
+ chip->client = client;
+
+ chip->regmap = devm_regmap_init_i2c(client, &mm8013_regmap_config);
+ if (IS_ERR(chip->regmap))
+ return dev_err_probe(dev, ret, "Couldn't initialize regmap\n");
+
+ ret = mm8013_checkdevice(chip);
+ if (ret)
+ return dev_err_probe(dev, ret, "MM8013 not found\n");
+
+ psy_cfg.drv_data = chip;
+ psy_cfg.of_node = dev->of_node;
+
+ psy = devm_power_supply_register(dev, &mm8013_desc, &psy_cfg);
+ if (IS_ERR(psy))
+ return PTR_ERR(psy);
+
+ return 0;
+}
+
+static const struct i2c_device_id mm8013_id_table[] = {
+ { "mm8013", 0 },
+ {}
+};
+MODULE_DEVICE_TABLE(i2c, mm8013_id_table);
+
+static const struct of_device_id mm8013_match_table[] = {
+ { .compatible = "mitsumi,mm8013" },
+ {}
+};
+
+static struct i2c_driver mm8013_i2c_driver = {
+ .probe = mm8013_probe,
+ .id_table = mm8013_id_table,
+ .driver = {
+ .name = "mm8013",
+ .of_match_table = mm8013_match_table,
+ },
+};
+module_i2c_driver(mm8013_i2c_driver);
+
+MODULE_DESCRIPTION("MM8013 fuel gauge driver");
+MODULE_LICENSE("GPL");
--
2.42.0
^ permalink raw reply related [flat|nested] 5+ messages in thread