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SubjectRe: [RFC 4/6] power: supply: Ettus Research E31x charger driver
Hi,

On Mon, Feb 11, 2019 at 07:01:41PM -0600, Virendra Kakade wrote:
> Add support for E31x devices charger which is a sub-device of E31X-PMU.
> Enables query of charger properties from device tree.
>
> Signed-off-by: Virendra Kakade <virendra.kakade@ni.com>
> ---
> drivers/power/supply/Kconfig | 6 +
> drivers/power/supply/Makefile | 1 +
> drivers/power/supply/e31x-charger.c | 190 ++++++++++++++++++++++++++++
> include/linux/mfd/e31x-pmu.h | 4 +
> 4 files changed, 201 insertions(+)
> create mode 100644 drivers/power/supply/e31x-charger.c
>
> diff --git a/drivers/power/supply/Kconfig b/drivers/power/supply/Kconfig
> index e901b9879e7e..3d043b8fd49c 100644
> --- a/drivers/power/supply/Kconfig
> +++ b/drivers/power/supply/Kconfig
> @@ -660,4 +660,10 @@ config FUEL_GAUGE_SC27XX
> Say Y here to enable support for fuel gauge with SC27XX
> PMIC chips.
>
> +config E31X_CHARGER
> + tristate "Ettus Research E31x charger support"
> + depends on MFD_E31X_PMU
> + help
> + This adds support for the battery charger in Ettus Research E31x PMU.
> +
> endif # POWER_SUPPLY
> diff --git a/drivers/power/supply/Makefile b/drivers/power/supply/Makefile
> index b731c2a9b695..6f4f8ca5484e 100644
> --- a/drivers/power/supply/Makefile
> +++ b/drivers/power/supply/Makefile
> @@ -87,3 +87,4 @@ obj-$(CONFIG_AXP288_CHARGER) += axp288_charger.o
> obj-$(CONFIG_CHARGER_CROS_USBPD) += cros_usbpd-charger.o
> obj-$(CONFIG_CHARGER_SC2731) += sc2731_charger.o
> obj-$(CONFIG_FUEL_GAUGE_SC27XX) += sc27xx_fuel_gauge.o
> +obj-$(CONFIG_E31X_CHARGER) += e31x-charger.o
> diff --git a/drivers/power/supply/e31x-charger.c b/drivers/power/supply/e31x-charger.c
> new file mode 100644
> index 000000000000..f154482bf95e
> --- /dev/null
> +++ b/drivers/power/supply/e31x-charger.c
> @@ -0,0 +1,190 @@
> +// SPDX-License-Identifier: GPL-2.0

This specifies GPLv2 only, but MODULE_LICENSE("GPL") specifies GPL2
or later. Please fix one of them.

> +/*
> + * Copyright (c) 2018 National Instruments Corp
> + * Author: Virendra Kakade <virendra.kakade@ni.com>
> + *
> + * Ettus Research E31x charger driver
> + */
> +
> +#include <linux/kernel.h>
> +#include <linux/module.h>
> +#include <linux/of_device.h>
> +#include <linux/platform_device.h>
> +#include <linux/mfd/syscon.h>
> +#include <linux/mutex.h>
> +#include <linux/regmap.h>
> +#include <linux/string.h>
> +#include <linux/slab.h>
> +#include <linux/power_supply.h>
> +#include <linux/delay.h>
> +#include <linux/mfd/e31x-pmu.h>

Please check the includes. Quite a few seem to be unused.

> +
> +#define E31X_PMU_CHARGER_HEALTH_MASK GENMASK(1, 0)
> +#define E31X_PMU_CHARGER_HEALTH_SHIFT 0
> +#define E31X_PMU_CHARGER_CHARGE_TYPE_MASK GENMASK(4, 3)
> +#define E31X_PMU_CHARGER_CHARGE_TYPE_SHIFT 3
> +
> +struct e31x_charger_dev {
> + struct regmap *regmap;
> + struct power_supply *supply;
> +};
> +
> +static int e31x_charger_get_health(struct e31x_charger_dev *charger,
> + union power_supply_propval *val)
> +{
> + u32 value;
> + int err;
> +
> + err = regmap_read(charger->regmap, E31X_PMU_REG_CHARGER, &value);
> + if (err)
> + return err;
> +
> + value = E31X_PMU_GET_FIELD(CHARGER_HEALTH, value);
> + switch (value) {
> + case 0x0:
> + val->intval = POWER_SUPPLY_HEALTH_GOOD;
> + break;
> + case 0x1:
> + val->intval = POWER_SUPPLY_HEALTH_UNSPEC_FAILURE;
> + break;
> + case 0x2:
> + val->intval = POWER_SUPPLY_HEALTH_OVERVOLTAGE;
> + break;
> + case 0x3:
> + val->intval = POWER_SUPPLY_HEALTH_OVERHEAT;
> + break;
> + default:
> + val->intval = POWER_SUPPLY_HEALTH_UNKNOWN;
> + break;
> + };
> +
> + return 0;
> +}
> +
> +static int e31x_charger_get_type(struct e31x_charger_dev *charger,
> + union power_supply_propval *val)
> +{
> + u32 value;
> + int err;
> +
> + err = regmap_read(charger->regmap, E31X_PMU_REG_CHARGER, &value);
> + if (err)
> + return err;
> +
> + value = E31X_PMU_GET_FIELD(CHARGER_CHARGE_TYPE, value);
> + switch (value) {
> + case 0x0:
> + val->intval = POWER_SUPPLY_CHARGE_TYPE_NONE;
> + break;
> + case 0x1:
> + val->intval = POWER_SUPPLY_CHARGE_TYPE_TRICKLE;
> + break;
> + case 0x2:
> + val->intval = POWER_SUPPLY_CHARGE_TYPE_FAST;
> + break;
> + default:
> + val->intval = POWER_SUPPLY_CHARGE_TYPE_NONE;
> + break;
> + };
> + return 0;
> +}
> +
> +static int e31x_charger_get_online(struct e31x_charger_dev *charger,
> + union power_supply_propval *val)
> +{
> + u32 value;
> + int err;
> +
> + err = regmap_read(charger->regmap, E31X_PMU_REG_CHARGER, &value);
> + if (err)
> + return err;
> +
> + value = E31X_PMU_GET_FIELD(CHARGER_ONLINE, value);
> + val->intval = !!value;
> +
> + return 0;
> +}
> +
> +static int e31x_charger_get_property(struct power_supply *psy,
> + enum power_supply_property psp,
> + union power_supply_propval *val)
> +{
> + struct e31x_charger_dev *charger = power_supply_get_drvdata(psy);
> + int err = -EINVAL;
> +
> + switch (psp) {
> + case POWER_SUPPLY_PROP_HEALTH:
> + return e31x_charger_get_health(charger, val);
> + case POWER_SUPPLY_PROP_CHARGE_TYPE:
> + return e31x_charger_get_type(charger, val);
> + case POWER_SUPPLY_PROP_ONLINE:
> + return e31x_charger_get_online(charger, val);
> + case POWER_SUPPLY_PROP_SCOPE:
> + val->intval = POWER_SUPPLY_SCOPE_SYSTEM;
> + return 0;
> + default:
> + break;
> + }
> +
> + return err;
> +}
> +
> +static enum power_supply_property e31x_charger_properties[] = {
> + POWER_SUPPLY_PROP_HEALTH,
> + POWER_SUPPLY_PROP_CHARGE_TYPE,
> + POWER_SUPPLY_PROP_ONLINE,
> + POWER_SUPPLY_PROP_SCOPE,
> +};
> +
> +static const struct power_supply_desc e31x_charger_desc = {
> + .name = "e31x-charger",
> + .type = POWER_SUPPLY_TYPE_MAINS,
> + .properties = e31x_charger_properties,
> + .num_properties = ARRAY_SIZE(e31x_charger_properties),
> + .get_property = e31x_charger_get_property,
> +};
> +
> +static const struct of_device_id e31x_charger_id[] = {
> + { .compatible = "ni,e31x-charger" },
> + { },
> +};
> +
> +static int e31x_charger_probe(struct platform_device *pdev)
> +{
> + struct power_supply_config psy_cfg = {};
> + struct e31x_charger_dev *charger;
> +
> + if (!of_device_is_available(pdev->dev.of_node))
> + return -ENODEV;
> +
> + charger = devm_kzalloc(&pdev->dev, sizeof(*charger), GFP_KERNEL);
> + if (!charger)
> + return -ENOMEM;
> +
> + charger->regmap = syscon_regmap_lookup_by_phandle(\

useless \

> + pdev->dev.parent->of_node, "regmap");
> +
> + psy_cfg.of_node = pdev->dev.of_node;
> + psy_cfg.drv_data = charger;
> +
> + charger->supply = devm_power_supply_register(&pdev->dev,
> + &e31x_charger_desc,
> + &psy_cfg);
> +
> + if (IS_ERR(charger->supply))
> + return PTR_ERR(charger->supply);
> + return 0;
> +}
> +
> +static struct platform_driver e31x_charger_driver = {
> + .driver = {
> + .name = "e31x-charger",
> + .of_match_table = e31x_charger_id,
> + },
> + .probe = e31x_charger_probe,
> +};
> +module_platform_driver(e31x_charger_driver);
> +
> +MODULE_AUTHOR("Virendra Kakade <virendra.kakade@ni.com>");
> +MODULE_DESCRIPTION("E31x charger driver");
> +MODULE_LICENSE("GPL");
> diff --git a/include/linux/mfd/e31x-pmu.h b/include/linux/mfd/e31x-pmu.h
> index c57d5a8c1aad..e0649845fe4d 100644
> --- a/include/linux/mfd/e31x-pmu.h
> +++ b/include/linux/mfd/e31x-pmu.h
> @@ -12,9 +12,13 @@
> #include <linux/bitops.h>
>
> #define E31X_PMU_REG_MISC 0x04
> +#define E31X_PMU_REG_CHARGER 0x0c
>
> #define E31X_PMU_GET_FIELD(name, reg) \
> (((reg) & E31X_PMU_## name ##_MASK) >> \
> E31X_PMU_## name ##_SHIFT)
>
> +#define E31X_PMU_CHARGER_ONLINE_MASK BIT(2)
> +#define E31X_PMU_CHARGER_ONLINE_SHIFT 2
> +
> #endif /* MFD_E31X_PMU_H */

Otherwise this looks good.

-- Sebastian
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