Message-Id: <20240106133546.936261-1-bhavin.sharma@siliconsignals.io>
Date: Sat,  6 Jan 2024 19:05:43 +0530
From: Bhavin Sharma <bhavin.sharma@...iconsignals.io>
To: sre@...nel.org
Cc: Bhavin Sharma <bhavin.sharma@...iconsignals.io>,
	Rob Herring <robh+dt@...nel.org>,
	Krzysztof Kozlowski <krzysztof.kozlowski+dt@...aro.org>,
	Conor Dooley <conor+dt@...nel.org>,
	Hardevsinh Palaniya <hardevsinh.palaniya@...iconsignals.io>,
	linux-pm@...r.kernel.org,
	devicetree@...r.kernel.org,
	linux-kernel@...r.kernel.org
Subject: [PATCH v2 1/2] power: supply: Add STC3117 fuel gauge unit driver

Adding support for stc3117 fuel gauge driver with
minimal functionality to read voltage level currently

Signed-off-by: Bhavin Sharma <bhavin.sharma@...iconsignals.io>
---
 drivers/power/supply/Kconfig              |   7 ++
 drivers/power/supply/Makefile             |   1 +
 drivers/power/supply/stc3117_fuel_gauge.c | 136 ++++++++++++++++++++++
 3 files changed, 144 insertions(+)
 create mode 100644 drivers/power/supply/stc3117_fuel_gauge.c

diff --git a/drivers/power/supply/Kconfig b/drivers/power/supply/Kconfig
index f21cb0581..02df55b0d 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 58b567278..f8ed3e5a8 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 000000000..bf87bc1b9
--- /dev/null
+++ b/drivers/power/supply/stc3117_fuel_gauge.c
@@ -0,0 +1,136 @@
+// 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@...iconsignals.io>
+ *              Hardevsinh Palaniya <hardevsinh.palaniya@...iconsignals.com>
+ */
+
+
+#include <linux/i2c.h>
+#include <linux/i2c-dev.h>
+#include <linux/kernel.h>
+#include <linux/module.h>
+#include <linux/uaccess.h>
+#include <linux/power_supply.h>
+
+#define VOLTAGE_REG_ADDR	0x08
+#define VOLTAGE_REG_ADDR_SIZE	1		//in bytes
+#define VOLTAGE_DATA_SIZE	2		//in bytes
+#define LSB_VALUE		2200		//in micro-volts
+
+
+static int stc3117_probe(struct i2c_client *client);
+static void stc3117_dev_remove(struct i2c_client *client);
+
+static int stc3117_get_property(struct power_supply *psy,
+	enum power_supply_property psp, union power_supply_propval *val);
+static int stc3117_get_batt_volt(const struct i2c_client *client);
+
+const struct i2c_client *tmp_client;
+struct power_supply *stc_sply;
+
+static const struct of_device_id stc3117_of_match[] = {
+	{ .compatible = "st,stc3117-fgu" },
+	{},
+};
+
+MODULE_DEVICE_TABLE(of, stc3117_of_match);
+
+static const struct i2c_device_id stc3117_id[] = {
+	{"stc3117", 0},
+	{},
+};
+
+
+MODULE_DEVICE_TABLE(i2c, stc3117_id);
+
+struct i2c_driver stc3117_i2c_driver = {
+	.driver = {
+		.name = "stc3117_i2c_driver",
+		.owner = THIS_MODULE,
+		.of_match_table = of_match_ptr(stc3117_of_match),
+	},
+	.probe = stc3117_probe,
+	.id_table = stc3117_id,
+	.remove = stc3117_dev_remove,
+};
+
+
+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_get_property(struct power_supply *psy,
+	enum power_supply_property psp, union power_supply_propval *val)
+{
+	switch (psp) {
+	case POWER_SUPPLY_PROP_VOLTAGE_NOW:
+		val->intval = stc3117_get_batt_volt(tmp_client);
+	break;
+	default:
+		return -EINVAL;
+	}
+	return 0;
+}
+
+
+static int stc3117_get_batt_volt(const struct i2c_client *stc_client)
+{
+	int ret, volt = 0;
+	char i2c_tx = VOLTAGE_REG_ADDR, i2c_rx[2] = {0};
+
+	ret = i2c_master_send(stc_client, &i2c_tx, VOLTAGE_REG_ADDR_SIZE);
+	if (ret > 0) {
+
+		ret = i2c_master_recv(stc_client, i2c_rx, VOLTAGE_DATA_SIZE);
+		if (ret > 0) {
+
+			volt = (i2c_rx[1] << 8) + i2c_rx[0];
+			volt *= LSB_VALUE;
+
+			return volt;
+		}
+	}
+
+	return ret;
+}
+
+static int stc3117_probe(struct i2c_client *client)
+{
+	struct power_supply_config psy_cfg = {};
+	struct device *dev;
+
+	dev = &client->dev;
+
+	psy_cfg.of_node = dev->of_node;
+
+	tmp_client = client;
+
+	stc_sply = power_supply_register(dev, &stc3117_battery_desc, &psy_cfg);
+	if (IS_ERR(stc_sply))
+		pr_err("failed to register battery\n");
+
+	return 0;
+}
+
+static void stc3117_dev_remove(struct i2c_client *client)
+{
+	power_supply_unregister(stc_sply);
+}
+
+module_i2c_driver(stc3117_i2c_driver);
+
+MODULE_LICENSE("GPL");
+MODULE_AUTHOR("Bhavin Sharma <bhavin.sharma@...iconsignals.io>");
+MODULE_AUTHOR("Hardevsinh Palaniya <hardevsinh.palaniya@...iconsignals.io>");
+MODULE_DESCRIPTION("STC3117 Fuel Gauge Driver");
-- 
2.25.1

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