@@ -14408,6 +14408,11 @@ 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)
@@ -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
@@ -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
new file mode 100644
@@ -0,0 +1,283 @@
+// 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>
+
+#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;
+};
+
+static int mm8013_write_reg(struct i2c_client *client, u8 reg, u16 value)
+{
+ int ret;
+
+ ret = i2c_smbus_write_word_data(client, reg, value);
+ if (ret < 0)
+ dev_err(&client->dev, "%s: err %d\n", __func__, ret);
+
+ usleep_range(4000, 5000);
+ return ret;
+}
+
+static int mm8013_read_reg(struct i2c_client *client, u8 reg)
+{
+ int ret;
+
+ ret = i2c_smbus_read_word_data(client, reg);
+ if (ret < 0)
+ dev_err(&client->dev, "%s: err %d\n", __func__, ret);
+
+ usleep_range(4000, 5000);
+ return ret;
+}
+
+static int mm8013_checkdevice(struct mm8013_chip *chip)
+{
+ int battery_id, ret;
+
+ ret = mm8013_write_reg(chip->client, REG_BATID, 0x0008);
+ if (ret < 0)
+ return ret;
+
+ ret = mm8013_read_reg(chip->client, REG_BATID);
+ if (ret < 0)
+ return ret;
+
+ if (ret == BATID_102)
+ battery_id = 2;
+ else if (ret == 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;
+ struct i2c_client *client = chip->client;
+ int ret = 0;
+
+ switch (psp) {
+ case POWER_SUPPLY_PROP_CAPACITY:
+ ret = mm8013_read_reg(client, REG_STATE_OF_CHARGE);
+ if (ret < 0)
+ return ret;
+
+ val->intval = ret;
+ break;
+ case POWER_SUPPLY_PROP_CHARGE_FULL:
+ ret = mm8013_read_reg(client, REG_FULL_CHARGE_CAPACITY);
+ if (ret < 0)
+ return ret;
+
+ val->intval = ret;
+ break;
+ case POWER_SUPPLY_PROP_CHARGE_FULL_DESIGN:
+ ret = mm8013_read_reg(client, REG_DESIGN_CAPACITY);
+ if (ret < 0)
+ return ret;
+
+ val->intval = ret;
+ break;
+ case POWER_SUPPLY_PROP_CURRENT_NOW:
+ ret = mm8013_read_reg(client, REG_AVERAGE_CURRENT);
+ if (ret < 0)
+ return ret;
+
+ if (ret > S16_MAX)
+ val->intval -= (1 << 16);
+ else
+ val->intval = ret;
+
+ val->intval *= -1000;
+ break;
+ case POWER_SUPPLY_PROP_CYCLE_COUNT:
+ ret = mm8013_read_reg(client, REG_CYCLE_COUNT);
+ if (ret < 0)
+ return ret;
+
+ val->intval = ret;
+ break;
+ case POWER_SUPPLY_PROP_HEALTH:
+ ret = mm8013_read_reg(client, REG_FLAGS);
+ if (ret < 0)
+ return ret;
+
+ if (ret & MM8013_FLAG_BATHI)
+ val->intval = POWER_SUPPLY_HEALTH_OVERVOLTAGE;
+ else if (ret & (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:
+ val->intval = mm8013_read_reg(client, REG_TEMPERATURE) > 0;
+ break;
+ case POWER_SUPPLY_PROP_STATUS:
+ ret = mm8013_read_reg(client, REG_FLAGS);
+ if (ret < 0)
+ return ret;
+
+ if (ret & MM8013_FLAG_DSG)
+ val->intval = POWER_SUPPLY_STATUS_DISCHARGING;
+ else if (ret & MM8013_FLAG_CHG)
+ val->intval = POWER_SUPPLY_STATUS_CHARGING;
+ else if (ret & MM8013_FLAG_FC)
+ val->intval = POWER_SUPPLY_STATUS_FULL;
+ else
+ val->intval = POWER_SUPPLY_STATUS_UNKNOWN;
+ break;
+ case POWER_SUPPLY_PROP_TEMP:
+ ret = mm8013_read_reg(client, REG_TEMPERATURE);
+ if (ret < 0)
+ return ret;
+
+ val->intval = DECIKELVIN_TO_DECIDEGC(ret);
+ break;
+ case POWER_SUPPLY_PROP_TIME_TO_EMPTY_AVG:
+ ret = mm8013_read_reg(client, REG_AVERAGE_TIME_TO_EMPTY);
+ if (ret < 0)
+ return ret;
+
+ /* The estimation is not yet ready */
+ if (ret == U16_MAX)
+ return -ENODATA;
+
+ val->intval = ret;
+ break;
+ case POWER_SUPPLY_PROP_TIME_TO_FULL_AVG:
+ ret = mm8013_read_reg(client, REG_AVERAGE_TIME_TO_FULL);
+ if (ret < 0)
+ return ret;
+
+ /* The estimation is not yet ready */
+ if (ret == U16_MAX)
+ return -ENODATA;
+
+ val->intval = ret;
+ break;
+ case POWER_SUPPLY_PROP_VOLTAGE_NOW:
+ ret = mm8013_read_reg(client, REG_VOLTAGE);
+ if (ret < 0)
+ return ret;
+
+ val->intval = ret;
+ 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 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;
+
+ ret = mm8013_checkdevice(chip);
+ if (ret)
+ return dev_err_probe(dev, -ENODEV, "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");
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> --- MAINTAINERS | 5 + drivers/power/supply/Kconfig | 9 ++ drivers/power/supply/Makefile | 1 + drivers/power/supply/mm8013.c | 283 ++++++++++++++++++++++++++++++++++++++++++ 4 files changed, 298 insertions(+)