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Date:   Thu, 18 Apr 2019 21:46:42 +0200
From:   Sebastian Reichel <sre@...nel.org>
To:     Artur Rojek <contact@...ur-rojek.eu>
Cc:     Jonathan Cameron <jic23@...nel.org>,
        Rob Herring <robh+dt@...nel.org>,
        Mark Rutland <mark.rutland@....com>, linux-pm@...r.kernel.org,
        linux-iio@...r.kernel.org, devicetree@...r.kernel.org,
        linux-kernel@...r.kernel.org, Paul Cercueil <paul@...pouillou.net>,
        Jonathan Cameron <Jonathan.Cameron@...wei.com>
Subject: Re: [PATCH v3] power: supply: add Ingenic JZ47xx battery driver.

Hi,

On Thu, Apr 18, 2019 at 08:24:04PM +0200, Artur Rojek wrote:
> Add a driver for battery present on Ingenic JZ47xx SoCs.
> 
> Signed-off-by: Artur Rojek <contact@...ur-rojek.eu>
> Reviewed-by: Jonathan Cameron <Jonathan.Cameron@...wei.com>
> ---

Thanks, queued.

-- Sebastian

> 
> Changes:
> 
> v2: - rework the return logic in ingenic_battery_get_property,
>     - make index offsets point forward in ingenic_battery_set_scale,
>     - fix spacing around scale_raw[best_idx + 1]
> 
> v3: Add the missing MODULE_LICENSE & Co.
> 
>  drivers/power/supply/Kconfig           |  11 ++
>  drivers/power/supply/Makefile          |   1 +
>  drivers/power/supply/ingenic-battery.c | 184 +++++++++++++++++++++++++
>  3 files changed, 196 insertions(+)
>  create mode 100644 drivers/power/supply/ingenic-battery.c
> 
> diff --git a/drivers/power/supply/Kconfig b/drivers/power/supply/Kconfig
> index b6a4265bf0ec..81b0c20b24dd 100644
> --- a/drivers/power/supply/Kconfig
> +++ b/drivers/power/supply/Kconfig
> @@ -169,6 +169,17 @@ config BATTERY_COLLIE
>  	  Say Y to enable support for the battery on the Sharp Zaurus
>  	  SL-5500 (collie) models.
>  
> +config BATTERY_INGENIC
> +	tristate "Ingenic JZ47xx SoCs battery driver"
> +	depends on MIPS || COMPILE_TEST
> +	depends on INGENIC_ADC
> +	help
> +	  Choose this option if you want to monitor battery status on
> +	  Ingenic JZ47xx SoC based devices.
> +
> +	  This driver can also be built as a module. If so, the module will be
> +	  called ingenic-battery.
> +
>  config BATTERY_IPAQ_MICRO
>  	tristate "iPAQ Atmel Micro ASIC battery driver"
>  	depends on MFD_IPAQ_MICRO
> diff --git a/drivers/power/supply/Makefile b/drivers/power/supply/Makefile
> index 1cdce3ded839..976dc1698134 100644
> --- a/drivers/power/supply/Makefile
> +++ b/drivers/power/supply/Makefile
> @@ -34,6 +34,7 @@ obj-$(CONFIG_BATTERY_PMU)	+= pmu_battery.o
>  obj-$(CONFIG_BATTERY_OLPC)	+= olpc_battery.o
>  obj-$(CONFIG_BATTERY_TOSA)	+= tosa_battery.o
>  obj-$(CONFIG_BATTERY_COLLIE)	+= collie_battery.o
> +obj-$(CONFIG_BATTERY_INGENIC)	+= ingenic-battery.o
>  obj-$(CONFIG_BATTERY_IPAQ_MICRO) += ipaq_micro_battery.o
>  obj-$(CONFIG_BATTERY_WM97XX)	+= wm97xx_battery.o
>  obj-$(CONFIG_BATTERY_SBS)	+= sbs-battery.o
> diff --git a/drivers/power/supply/ingenic-battery.c b/drivers/power/supply/ingenic-battery.c
> new file mode 100644
> index 000000000000..35816d4b3012
> --- /dev/null
> +++ b/drivers/power/supply/ingenic-battery.c
> @@ -0,0 +1,184 @@
> +// SPDX-License-Identifier: GPL-2.0
> +/*
> + * Battery driver for the Ingenic JZ47xx SoCs
> + * Copyright (c) 2019 Artur Rojek <contact@...ur-rojek.eu>
> + *
> + * based on drivers/power/supply/jz4740-battery.c
> + */
> +
> +#include <linux/iio/consumer.h>
> +#include <linux/module.h>
> +#include <linux/of.h>
> +#include <linux/platform_device.h>
> +#include <linux/power_supply.h>
> +#include <linux/property.h>
> +
> +struct ingenic_battery {
> +	struct device *dev;
> +	struct iio_channel *channel;
> +	struct power_supply_desc desc;
> +	struct power_supply *battery;
> +	struct power_supply_battery_info info;
> +};
> +
> +static int ingenic_battery_get_property(struct power_supply *psy,
> +					enum power_supply_property psp,
> +					union power_supply_propval *val)
> +{
> +	struct ingenic_battery *bat = power_supply_get_drvdata(psy);
> +	struct power_supply_battery_info *info = &bat->info;
> +	int ret;
> +
> +	switch (psp) {
> +	case POWER_SUPPLY_PROP_HEALTH:
> +		ret = iio_read_channel_processed(bat->channel, &val->intval);
> +		val->intval *= 1000;
> +		if (val->intval < info->voltage_min_design_uv)
> +			val->intval = POWER_SUPPLY_HEALTH_DEAD;
> +		else if (val->intval > info->voltage_max_design_uv)
> +			val->intval = POWER_SUPPLY_HEALTH_OVERVOLTAGE;
> +		else
> +			val->intval = POWER_SUPPLY_HEALTH_GOOD;
> +		return ret;
> +	case POWER_SUPPLY_PROP_VOLTAGE_NOW:
> +		ret = iio_read_channel_processed(bat->channel, &val->intval);
> +		val->intval *= 1000;
> +		return ret;
> +	case POWER_SUPPLY_PROP_VOLTAGE_MIN_DESIGN:
> +		val->intval = info->voltage_min_design_uv;
> +		return 0;
> +	case POWER_SUPPLY_PROP_VOLTAGE_MAX_DESIGN:
> +		val->intval = info->voltage_max_design_uv;
> +		return 0;
> +	default:
> +		return -EINVAL;
> +	};
> +}
> +
> +/* Set the most appropriate IIO channel voltage reference scale
> + * based on the battery's max voltage.
> + */
> +static int ingenic_battery_set_scale(struct ingenic_battery *bat)
> +{
> +	const int *scale_raw;
> +	int scale_len, scale_type, best_idx = -1, best_mV, max_raw, i, ret;
> +	u64 max_mV;
> +
> +	ret = iio_read_max_channel_raw(bat->channel, &max_raw);
> +	if (ret) {
> +		dev_err(bat->dev, "Unable to read max raw channel value\n");
> +		return ret;
> +	}
> +
> +	ret = iio_read_avail_channel_attribute(bat->channel, &scale_raw,
> +					       &scale_type, &scale_len,
> +					       IIO_CHAN_INFO_SCALE);
> +	if (ret < 0) {
> +		dev_err(bat->dev, "Unable to read channel avail scale\n");
> +		return ret;
> +	}
> +	if (ret != IIO_AVAIL_LIST || scale_type != IIO_VAL_FRACTIONAL_LOG2)
> +		return -EINVAL;
> +
> +	max_mV = bat->info.voltage_max_design_uv / 1000;
> +
> +	for (i = 0; i < scale_len; i += 2) {
> +		u64 scale_mV = (max_raw * scale_raw[i]) >> scale_raw[i + 1];
> +
> +		if (scale_mV < max_mV)
> +			continue;
> +
> +		if (best_idx >= 0 && scale_mV > best_mV)
> +			continue;
> +
> +		best_mV = scale_mV;
> +		best_idx = i;
> +	}
> +
> +	if (best_idx < 0) {
> +		dev_err(bat->dev, "Unable to find matching voltage scale\n");
> +		return -EINVAL;
> +	}
> +
> +	return iio_write_channel_attribute(bat->channel,
> +					   scale_raw[best_idx],
> +					   scale_raw[best_idx + 1],
> +					   IIO_CHAN_INFO_SCALE);
> +}
> +
> +static enum power_supply_property ingenic_battery_properties[] = {
> +	POWER_SUPPLY_PROP_HEALTH,
> +	POWER_SUPPLY_PROP_VOLTAGE_NOW,
> +	POWER_SUPPLY_PROP_VOLTAGE_MIN_DESIGN,
> +	POWER_SUPPLY_PROP_VOLTAGE_MAX_DESIGN,
> +};
> +
> +static int ingenic_battery_probe(struct platform_device *pdev)
> +{
> +	struct device *dev = &pdev->dev;
> +	struct ingenic_battery *bat;
> +	struct power_supply_config psy_cfg = {};
> +	struct power_supply_desc *desc;
> +	int ret;
> +
> +	bat = devm_kzalloc(dev, sizeof(*bat), GFP_KERNEL);
> +	if (!bat)
> +		return -ENOMEM;
> +
> +	bat->dev = dev;
> +	bat->channel = devm_iio_channel_get(dev, "battery");
> +	if (IS_ERR(bat->channel))
> +		return PTR_ERR(bat->channel);
> +
> +	desc = &bat->desc;
> +	desc->name = "jz-battery";
> +	desc->type = POWER_SUPPLY_TYPE_BATTERY;
> +	desc->properties = ingenic_battery_properties;
> +	desc->num_properties = ARRAY_SIZE(ingenic_battery_properties);
> +	desc->get_property = ingenic_battery_get_property;
> +	psy_cfg.drv_data = bat;
> +	psy_cfg.of_node = dev->of_node;
> +
> +	bat->battery = devm_power_supply_register(dev, desc, &psy_cfg);
> +	if (IS_ERR(bat->battery)) {
> +		dev_err(dev, "Unable to register battery\n");
> +		return PTR_ERR(bat->battery);
> +	}
> +
> +	ret = power_supply_get_battery_info(bat->battery, &bat->info);
> +	if (ret) {
> +		dev_err(dev, "Unable to get battery info: %d\n", ret);
> +		return ret;
> +	}
> +	if (bat->info.voltage_min_design_uv < 0) {
> +		dev_err(dev, "Unable to get voltage min design\n");
> +		return bat->info.voltage_min_design_uv;
> +	}
> +	if (bat->info.voltage_max_design_uv < 0) {
> +		dev_err(dev, "Unable to get voltage max design\n");
> +		return bat->info.voltage_max_design_uv;
> +	}
> +
> +	return ingenic_battery_set_scale(bat);
> +}
> +
> +#ifdef CONFIG_OF
> +static const struct of_device_id ingenic_battery_of_match[] = {
> +	{ .compatible = "ingenic,jz4740-battery", },
> +	{ },
> +};
> +MODULE_DEVICE_TABLE(of, ingenic_battery_of_match);
> +#endif
> +
> +static struct platform_driver ingenic_battery_driver = {
> +	.driver = {
> +		.name = "ingenic-battery",
> +		.of_match_table = of_match_ptr(ingenic_battery_of_match),
> +	},
> +	.probe = ingenic_battery_probe,
> +};
> +module_platform_driver(ingenic_battery_driver);
> +
> +MODULE_DESCRIPTION("Battery driver for Ingenic JZ47xx SoCs");
> +MODULE_AUTHOR("Artur Rojek <contact@...ur-rojek.eu>");
> +MODULE_LICENSE("GPL");
> -- 
> 2.21.0
> 

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