On 06/01/2024 14:35, Bhavin Sharma wrote:
> Adding support for stc3117 fuel gauge driver with
> minimal functionality to read voltage level currently
>
> Signed-off-by: Bhavin Sharma <bhavin.sharma@xxxxxxxxxxxxxxxxx>
> ---
> 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@xxxxxxxxxxxxxxxxx>
> + * Hardevsinh Palaniya <hardevsinh.palaniya@xxxxxxxxxxxxxxxxxx>
> + */
> +
> +
Just one blank line
> +#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
LSB of what? This is very poor naming.
Missing spaces after //
> +
> +
One blank line
> +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);
Drop all these.
> +
> +const struct i2c_client *tmp_client;
Drop
> +struct power_supply *stc_sply;
Drop
> +
> +static const struct of_device_id stc3117_of_match[] = {
This goes next to driver structure.
> + { .compatible = "st,stc3117-fgu" },
> + {},
> +};
> +
No blank line
> +MODULE_DEVICE_TABLE(of, stc3117_of_match);
> +
> +static const struct i2c_device_id stc3117_id[] = {
The same.
> + {"stc3117", 0},
> + {},
> +};
> +
> +
No blank lines
> +MODULE_DEVICE_TABLE(i2c, stc3117_id);
> +
> +struct i2c_driver stc3117_i2c_driver = {
Where did you place it? Open existing drivers and see how it is done.
> + .driver = {
> + .name = "stc3117_i2c_driver",
> + .owner = THIS_MODULE,
Drop, ok, this is some ancient vendor driver which you just send
upstream. Sorry, no. You must clean it from all that ancient cruft.
You must run smatch, sparse and coccinelle/coccicheck.
> + .of_match_table = of_match_ptr(stc3117_of_match),
Drop of_match_ptr
> + },
> + .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;
> +}
> +
> +
What's with this double blank lines?
> +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);
devm
> + if (IS_ERR(stc_sply))
> + pr_err("failed to register battery\n");
dev_err
> +
> + 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@xxxxxxxxxxxxxxxxx>");
> +MODULE_AUTHOR("Hardevsinh Palaniya <hardevsinh.palaniya@xxxxxxxxxxxxxxxxx>");
> +MODULE_DESCRIPTION("STC3117 Fuel Gauge Driver");
Best regards,
Krzysztof
