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Diffstat (limited to 'drivers/power/supply/mm8013.c')
-rw-r--r--drivers/power/supply/mm8013.c317
1 files changed, 317 insertions, 0 deletions
diff --git a/drivers/power/supply/mm8013.c b/drivers/power/supply/mm8013.c
new file mode 100644
index 0000000000..caa272b035
--- /dev/null
+++ b/drivers/power/supply/mm8013.c
@@ -0,0 +1,317 @@
+// 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_BATLOW BIT(12)
+ #define MM8013_FLAG_CHG_INH BIT(11)
+ #define MM8013_FLAG_FC BIT(9)
+ #define MM8013_FLAG_CHG BIT(8)
+ #define MM8013_FLAG_OCC BIT(6)
+ #define MM8013_FLAG_ODC BIT(5)
+ #define MM8013_FLAG_OT BIT(4)
+ #define MM8013_FLAG_UT BIT(3)
+ #define MM8013_FLAG_DSG BIT(0)
+#define REG_FULL_CHARGE_CAPACITY 0x0e
+#define REG_NOMINAL_CHARGE_CAPACITY 0x0c
+#define REG_AVERAGE_CURRENT 0x14
+#define REG_AVERAGE_TIME_TO_EMPTY 0x16
+#define REG_AVERAGE_TIME_TO_FULL 0x18
+#define REG_MAX_LOAD_CURRENT 0x1e
+#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;
+
+ 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_BEHAVIOUR,
+ POWER_SUPPLY_PROP_CHARGE_FULL,
+ POWER_SUPPLY_PROP_CHARGE_FULL_DESIGN,
+ POWER_SUPPLY_PROP_CHARGE_NOW,
+ POWER_SUPPLY_PROP_CURRENT_MAX,
+ 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, &regval);
+ if (ret < 0)
+ return ret;
+
+ val->intval = regval;
+ break;
+ case POWER_SUPPLY_PROP_CHARGE_BEHAVIOUR:
+ ret = regmap_read(chip->regmap, REG_FLAGS, &regval);
+ if (ret < 0)
+ return ret;
+
+ if (regval & MM8013_FLAG_CHG_INH)
+ val->intval = POWER_SUPPLY_CHARGE_BEHAVIOUR_INHIBIT_CHARGE;
+ else
+ val->intval = POWER_SUPPLY_CHARGE_BEHAVIOUR_AUTO;
+ break;
+ case POWER_SUPPLY_PROP_CHARGE_FULL:
+ ret = regmap_read(chip->regmap, REG_FULL_CHARGE_CAPACITY, &regval);
+ 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, &regval);
+ if (ret < 0)
+ return ret;
+
+ val->intval = 1000 * regval;
+ break;
+ case POWER_SUPPLY_PROP_CHARGE_NOW:
+ ret = regmap_read(chip->regmap, REG_NOMINAL_CHARGE_CAPACITY, &regval);
+ if (ret < 0)
+ return ret;
+
+ val->intval = 1000 * regval;
+ break;
+ case POWER_SUPPLY_PROP_CURRENT_MAX:
+ ret = regmap_read(chip->regmap, REG_MAX_LOAD_CURRENT, &regval);
+ if (ret < 0)
+ return ret;
+
+ val->intval = -1000 * (s16)regval;
+ break;
+ case POWER_SUPPLY_PROP_CURRENT_NOW:
+ ret = regmap_read(chip->regmap, REG_AVERAGE_CURRENT, &regval);
+ 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, &regval);
+ if (ret < 0)
+ return ret;
+
+ val->intval = regval;
+ break;
+ case POWER_SUPPLY_PROP_HEALTH:
+ ret = regmap_read(chip->regmap, REG_FLAGS, &regval);
+ if (ret < 0)
+ return ret;
+
+ if (regval & MM8013_FLAG_UT)
+ val->intval = POWER_SUPPLY_HEALTH_COLD;
+ else if (regval & (MM8013_FLAG_ODC | MM8013_FLAG_OCC))
+ val->intval = POWER_SUPPLY_HEALTH_OVERCURRENT;
+ else if (regval & (MM8013_FLAG_BATLOW))
+ val->intval = POWER_SUPPLY_HEALTH_UNSPEC_FAILURE;
+ else if (regval & MM8013_FLAG_BATHI)
+ val->intval = POWER_SUPPLY_HEALTH_OVERVOLTAGE;
+ else if (regval & (MM8013_FLAG_OT | 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, &regval);
+ if (ret < 0)
+ return ret;
+
+ val->intval = ((s16)regval > 0);
+ break;
+ case POWER_SUPPLY_PROP_STATUS:
+ ret = regmap_read(chip->regmap, REG_FLAGS, &regval);
+ 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, &regval);
+ 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, &regval);
+ 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, &regval);
+ 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, &regval);
+ 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)) {
+ ret = PTR_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");