Adding minimal support for stc3117 fuel gauge driver
to read battery voltage level
Signed-off-by: Bhavin Sharma <bhavin.sharma@xxxxxxxxxxxxxxxxx>
---
Changelogs :
v2 -> v3
- Resolved kernel test robot build warnings
- Aligned included header files in alphabetical order
- Removed unused header files
- Removed unnecessary blank lines
- Aligned all the macros in alphabetical order
- Changed macro LSB_VALUE to VOLTAGE_LSB_VALUE
- Dropped function prototypes and arranged the code accordingly
- Used macros instead of static numbers for array declaration
- Removed redundant code
- Replaced 'power_supply_register' with 'devm_power_supply_register' and 'pr_err' with 'dev_err'
- Removed global variables
v1 -> v2
- No change
---
drivers/power/supply/Kconfig | 7 ++
drivers/power/supply/Makefile | 1 +
drivers/power/supply/stc3117_fuel_gauge.c | 107 ++++++++++++++++++++++
3 files changed, 115 insertions(+)
create mode 100644 drivers/power/supply/stc3117_fuel_gauge.c
diff --git a/drivers/power/supply/Kconfig b/drivers/power/supply/Kconfig
index f21cb05815ec..e2e3af4bcd5f 100644
--- a/drivers/power/supply/Kconfig
+++ b/drivers/power/supply/Kconfig
@@ -875,6 +875,13 @@ config FUEL_GAUGE_SC27XX
Say Y here to enable support for fuel gauge with SC27XX
PMIC chips.
+config FUEL_GAUGE_STC3117
+ tristate "STMicroelectronics STC3117 fuel gauge driver"
+ depends on I2C
+ help
+ Say Y here to enable support for fuel gauge with STC3117
+ PMIC chips.
+
config CHARGER_UCS1002
tristate "Microchip UCS1002 USB Port Power Controller"
depends on I2C
diff --git a/drivers/power/supply/Makefile b/drivers/power/supply/Makefile
index 58b567278034..be8961661bd1 100644
--- a/drivers/power/supply/Makefile
+++ b/drivers/power/supply/Makefile
@@ -104,6 +104,7 @@ obj-$(CONFIG_CHARGER_CROS_USBPD) += cros_usbpd-charger.o
obj-$(CONFIG_CHARGER_CROS_PCHG) += cros_peripheral_charger.o
obj-$(CONFIG_CHARGER_SC2731) += sc2731_charger.o
obj-$(CONFIG_FUEL_GAUGE_SC27XX) += sc27xx_fuel_gauge.o
+obj-$(CONFIG_FUEL_GAUGE_STC3117) += stc3117_fuel_gauge.o
obj-$(CONFIG_CHARGER_UCS1002) += ucs1002_power.o
obj-$(CONFIG_CHARGER_BD99954) += bd99954-charger.o
obj-$(CONFIG_CHARGER_WILCO) += wilco-charger.o
diff --git a/drivers/power/supply/stc3117_fuel_gauge.c b/drivers/power/supply/stc3117_fuel_gauge.c
new file mode 100644
index 000000000000..29eb00b44e21
--- /dev/null
+++ b/drivers/power/supply/stc3117_fuel_gauge.c
@@ -0,0 +1,107 @@
+// SPDX-License-Identifier: GPL-2.0-only
+/*
+ * stc3117_fuel_gauge.c - STMicroelectronics STC3117 Fuel Gauge Driver
+ *
+ * Copyright (c) 2024 Silicon Signals Pvt Ltd.
+ * Author: Bhavin Sharma <bhavin.sharma@xxxxxxxxxxxxxxxxx>
+ * Hardevsinh Palaniya <hardevsinh.palaniya@xxxxxxxxxxxxxxxxxx>
+ */
+
+#include <linux/i2c.h>
+#include <linux/power_supply.h>
+
+#define VOLTAGE_DATA_SIZE 2 // in bytes
+#define VOLTAGE_LSB_VALUE 2200 // in micro-volts
+#define VOLTAGE_REG_ADDR 0x08
+#define VOLTAGE_REG_ADDR_SIZE 1 // in bytes
+
+static int stc3117_get_batt_volt(const struct i2c_client *stc_client)
+{
+ int ret, volt = 0;
+ char i2c_tx = VOLTAGE_REG_ADDR, i2c_rx[VOLTAGE_DATA_SIZE] = {0};
+
+ ret = i2c_master_send(stc_client, &i2c_tx, VOLTAGE_REG_ADDR_SIZE);
+ if (ret < 0)
+ return ret;
+
+ ret = i2c_master_recv(stc_client, i2c_rx, VOLTAGE_DATA_SIZE);
+ if (ret < 0)
+ return ret;
+
+ volt = (i2c_rx[1] << 8) + i2c_rx[0];
+ volt *= VOLTAGE_LSB_VALUE;
+
+ return volt;
+}
+
+static int stc3117_get_property(struct power_supply *psy,
+ enum power_supply_property psp, union power_supply_propval *val)
+{
+ struct i2c_client *client = to_i2c_client(psy->dev.parent);
+
+ switch (psp) {
+ case POWER_SUPPLY_PROP_VOLTAGE_NOW:
+ val->intval = stc3117_get_batt_volt(client);
+ break;
+ default:
+ return -EINVAL;
+ }
+ return 0;
+}
+
+static enum power_supply_property stc3117_battery_props[] = {
+ POWER_SUPPLY_PROP_VOLTAGE_NOW,
+};
+
+static const struct power_supply_desc stc3117_battery_desc = {
+ .name = "stc3117-battery",
+ .type = POWER_SUPPLY_TYPE_BATTERY,
+ .get_property = stc3117_get_property,
+ .properties = stc3117_battery_props,
+ .num_properties = ARRAY_SIZE(stc3117_battery_props),
+};
+
+static int stc3117_probe(struct i2c_client *client)
+{
+ struct power_supply_config psy_cfg = {};
+ struct device *dev;
+ struct power_supply *stc_sply;
+
+ dev = &client->dev;
+
+ psy_cfg.of_node = dev->of_node;
+
+ stc_sply = devm_power_supply_register(dev, &stc3117_battery_desc, &psy_cfg);
+ if (IS_ERR(stc_sply))
+ dev_err(dev, "failed to register battery\n");
+
+ return 0;
+}
+
+static const struct i2c_device_id stc3117_id[] = {
+ {"stc3117", 0},
+ {},
+};
+MODULE_DEVICE_TABLE(i2c, stc3117_id);
+
+static const struct of_device_id stc3117_of_match[] = {
+ { .compatible = "st,stc3117" },
+ {},
+};
+MODULE_DEVICE_TABLE(of, stc3117_of_match);
+
+static struct i2c_driver stc3117_i2c_driver = {
+ .driver = {
+ .name = "stc3117_i2c_driver",
+ .of_match_table = stc3117_of_match,
+ },
+ .probe = stc3117_probe,
+ .id_table = stc3117_id,
+};
+
+module_i2c_driver(stc3117_i2c_driver);
+
+MODULE_LICENSE("GPL");
+MODULE_AUTHOR("Bhavin Sharma <bhavin.sharma@xxxxxxxxxxxxxxxxx>");
+MODULE_AUTHOR("Hardevsinh Palaniya <hardevsinh.palaniya@xxxxxxxxxxxxxxxxx>");
+MODULE_DESCRIPTION("STC3117 Fuel Gauge Driver");
--
2.25.1
