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Date: Sat, 6 Jan 2024 14:57:57 +0100
From: Christophe JAILLET <christophe.jaillet@...adoo.fr>
To: bhavin.sharma@...iconsignals.io
Cc: conor+dt@...nel.org, devicetree@...r.kernel.org,
krzysztof.kozlowski+dt@...aro.org, linux-kernel@...r.kernel.org,
linux-pm@...r.kernel.org, robh+dt@...nel.org, sre@...nel.org
Subject: Re: [PATCH 1/2] power: supply: Add STC3117 fuel gauge unit driver
Le 06/01/2024 à 11:14, Bhavin Sharma a écrit :
> Adding support for stc3117 fuel gauge driver with
> minimal functionality to read voltage level currently
>
> Signed-off-by: Bhavin Sharma <bhavin.sharma-TXG9oGKWPboh9/7i5KS7/GGXanvQGlWp@...lic.gmane.org>
> ---
Hi,
> 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 f21cb05815ec..02df55b0d5f0 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..f8ed3e5a8882 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..bb033ac54858
> --- /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-TXG9oGKWPboh9/7i5KS7/GGXanvQGlWp@...lic.gmane.org>
> + * Hardevsinh Palaniya <hardevsinh.palaniya-TXG9oGKWPbrc8hPZMNZi9dBPR1lH4CV8@...lic.gmane.org>
> + */
> +
> +
Only 1 NL is enough.
> +#include <linux/i2c.h>
> +#include <linux/i2c-dev.h>
> +#include <linux/kernel.h>
Is it really needed for a small driver like this?
> +#include <linux/module.h>
> +#include <linux/uaccess.h>
> +#include <linux/power_supply.h>
Keep alphabetical order.
> +
> +#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);
If struct i2c_driver stc3117_i2c_driver was declared at the end of the
fine, these prototypes could be removed.
> +
> +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);
Same here.
I think that a different ordering could avoid these prototypes.
> +
> +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},
> + {},
> +};
> +
> +
Only 1 NL is enough.
> +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,
> +};
> +
> +
Only 1 NL is enough.
> +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;
This break should be indented by 1 more tab.
> + default:
> + return -EINVAL;
> + }
> + return 0;
> +}
> +
> +
Only 1 NL is enough.
> +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};
Maybe VOLTAGE_DATA_SIZE, instead of 2?
> +
> + 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;
> +}
Writting it as:
ret = i2c_master_send()
if (ret < 0)
return ret;
ret = i2c_master_recv();
if (ret < 0)
return ret;
vols = ...
would save some indentation.
> +
> +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_power_supply_register() ?
This would remove the need of the .remove() function.
> + if (IS_ERR(stc_sply))
> + pr_err("failed to register battery\n");
dev_err()?
Maybe this error code should be propagated. What the point of this
driver if this function fails?
just my 2c,
CJ
> +
> + 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-TXG9oGKWPboh9/7i5KS7/GGXanvQGlWp@...lic.gmane.org>");
> +MODULE_AUTHOR("Hardevsinh Palaniya <hardevsinh.palaniya-TXG9oGKWPboh9/7i5KS7/GGXanvQGlWp@...lic.gmane.org>");
> +MODULE_DESCRIPTION("STC3117 Fuel Gauge Driver");
> +MODULE_VERSION("v1.0");
> +
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