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MAZPR01MB6957.INDPRD01.PROD.OUTLOOK.COM ([fe80::72b4:8a64:2d93:7cc0]) by MAZPR01MB6957.INDPRD01.PROD.OUTLOOK.COM ([fe80::72b4:8a64:2d93:7cc0%4]) with mapi id 15.20.7249.032; Mon, 5 Feb 2024 05:13:45 +0000 From: Bhavin Sharma To: sre@kernel.org, robh+dt@kernel.org, krzysztof.kozlowski+dt@linaro.org, conor+dt@kernel.org Cc: Bhavin Sharma , Hardevsinh Palaniya , linux-pm@vger.kernel.org, devicetree@vger.kernel.org, linux-kernel@vger.kernel.org Subject: [PATCH v3 1/2] power: supply: Add STC3117 fuel gauge unit driver Date: Mon, 5 Feb 2024 10:43:17 +0530 Message-Id: <20240205051321.4079933-1-bhavin.sharma@siliconsignals.io> X-Mailer: git-send-email 2.25.1 X-ClientProxiedBy: PN3PR01CA0085.INDPRD01.PROD.OUTLOOK.COM (2603:1096:c01:9a::21) To MAZPR01MB6957.INDPRD01.PROD.OUTLOOK.COM (2603:1096:a01:42::6) Precedence: bulk X-Mailing-List: linux-kernel@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 X-MS-PublicTrafficType: Email X-MS-TrafficTypeDiagnostic: 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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 + * Hardevsinh Palaniya + */ + +#include +#include + +#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 "); +MODULE_AUTHOR("Hardevsinh Palaniya "); +MODULE_DESCRIPTION("STC3117 Fuel Gauge Driver");