Message-ID: <6d957019-ccec-4129-9e6d-33204de88dd5@linaro.org>
Date: Wed, 29 May 2024 16:51:54 +0100
From: Bryan O'Donoghue <bryan.odonoghue@...aro.org>
To: Dmitry Baryshkov <dmitry.baryshkov@...aro.org>,
 Sebastian Reichel <sre@...nel.org>, Rob Herring <robh@...nel.org>,
 Krzysztof Kozlowski <krzk+dt@...nel.org>, Conor Dooley
 <conor+dt@...nel.org>, Bjorn Andersson <andersson@...nel.org>,
 Hans de Goede <hdegoede@...hat.com>,
 Ilpo Järvinen <ilpo.jarvinen@...ux.intel.com>,
 Heikki Krogerus <heikki.krogerus@...ux.intel.com>,
 Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
 Konrad Dybcio <konrad.dybcio@...aro.org>
Cc: linux-pm@...r.kernel.org, devicetree@...r.kernel.org,
 linux-kernel@...r.kernel.org, platform-driver-x86@...r.kernel.org,
 linux-usb@...r.kernel.org, linux-arm-msm@...r.kernel.org,
 Nikita Travkin <nikita@...n.ru>
Subject: Re: [PATCH v4 4/6] power: supply: lenovo_yoga_c630_battery: add
 Lenovo C630 driver

On 28/05/2024 21:44, Dmitry Baryshkov wrote:
> On the Lenovo Yoga C630 WOS laptop the EC provides access to the adapter
> and battery status. Add the driver to read power supply status on the
> laptop.
> 
> Signed-off-by: Dmitry Baryshkov <dmitry.baryshkov@...aro.org>
> ---
>   drivers/power/supply/Kconfig                    |   9 +
>   drivers/power/supply/Makefile                   |   1 +
>   drivers/power/supply/lenovo_yoga_c630_battery.c | 479 ++++++++++++++++++++++++
>   3 files changed, 489 insertions(+)
> 
> diff --git a/drivers/power/supply/Kconfig b/drivers/power/supply/Kconfig
> index 3e31375491d5..55ab8e90747d 100644
> --- a/drivers/power/supply/Kconfig
> +++ b/drivers/power/supply/Kconfig
> @@ -167,6 +167,15 @@ config BATTERY_LEGO_EV3
>   	help
>   	  Say Y here to enable support for the LEGO MINDSTORMS EV3 battery.
>   
> +config BATTERY_LENOVO_YOGA_C630
> +	tristate "Lenovo Yoga C630 battery"
> +	depends on OF && EC_LENOVO_YOGA_C630
> +	help
> +	  This driver enables battery support on the Lenovo Yoga C630 laptop.
> +
> +	  To compile the driver as a module, choose M here: the module will be
> +	  called lenovo_yoga_c630_battery.
> +
>   config BATTERY_PMU
>   	tristate "Apple PMU battery"
>   	depends on PPC32 && ADB_PMU
> diff --git a/drivers/power/supply/Makefile b/drivers/power/supply/Makefile
> index 58b567278034..8ebbdcf92dac 100644
> --- a/drivers/power/supply/Makefile
> +++ b/drivers/power/supply/Makefile
> @@ -32,6 +32,7 @@ obj-$(CONFIG_BATTERY_DS2782)	+= ds2782_battery.o
>   obj-$(CONFIG_BATTERY_GAUGE_LTC2941)	+= ltc2941-battery-gauge.o
>   obj-$(CONFIG_BATTERY_GOLDFISH)	+= goldfish_battery.o
>   obj-$(CONFIG_BATTERY_LEGO_EV3)	+= lego_ev3_battery.o
> +obj-$(CONFIG_BATTERY_LENOVO_YOGA_C630) += lenovo_yoga_c630_battery.o
>   obj-$(CONFIG_BATTERY_PMU)	+= pmu_battery.o
>   obj-$(CONFIG_BATTERY_QCOM_BATTMGR)	+= qcom_battmgr.o
>   obj-$(CONFIG_BATTERY_OLPC)	+= olpc_battery.o
> diff --git a/drivers/power/supply/lenovo_yoga_c630_battery.c b/drivers/power/supply/lenovo_yoga_c630_battery.c
> new file mode 100644
> index 000000000000..76152ad38d46
> --- /dev/null
> +++ b/drivers/power/supply/lenovo_yoga_c630_battery.c
> @@ -0,0 +1,479 @@
> +// SPDX-License-Identifier: GPL-2.0-only
> +/*
> + * Copyright (c) 2022-2024, Linaro Ltd
> + * Authors:
> + *    Bjorn Andersson
> + *    Dmitry Baryshkov
> + */
> +#include <linux/auxiliary_bus.h>
> +#include <linux/delay.h>
> +#include <linux/module.h>
> +#include <linux/platform_data/lenovo-yoga-c630.h>
> +#include <linux/power_supply.h>
> +
> +struct yoga_c630_psy {
> +	struct yoga_c630_ec *ec;
> +	struct device *dev;
> +	struct device_node *of_node;
> +	struct notifier_block nb;
> +	struct mutex lock;

Do locks still not require a

struct mutex lock; /* this mutex locks this thing */

> +
> +	struct power_supply *adp_psy;
> +	struct power_supply *bat_psy;
> +
> +	unsigned long last_status_update;
> +
> +	bool adapter_online;
> +
> +	bool unit_mA;
> +
> +	bool bat_present;
> +	unsigned int bat_status;
> +	unsigned int design_capacity;
> +	unsigned int design_voltage;
> +	unsigned int full_charge_capacity;
> +
> +	unsigned int capacity_now;
> +	unsigned int voltage_now;
> +
> +	int current_now;
> +	int rate_now;
> +};
> +
> +#define LENOVO_EC_CACHE_TIME		(10 * HZ)
> +
> +#define LENOVO_EC_ADPT_STATUS		0xa3
> +#define LENOVO_EC_ADPT_PRESENT		BIT(7)
> +#define LENOVO_EC_BAT_ATTRIBUTES	0xc0
> +#define LENOVO_EC_BAT_ATTR_UNIT_IS_MA	BIT(1)
> +#define LENOVO_EC_BAT_STATUS		0xc1
> +#define LENOVO_EC_BAT_REMAIN_CAPACITY	0xc2
> +#define LENOVO_EC_BAT_VOLTAGE		0xc6
> +#define LENOVO_EC_BAT_DESIGN_VOLTAGE	0xc8
> +#define LENOVO_EC_BAT_DESIGN_CAPACITY	0xca
> +#define LENOVO_EC_BAT_FULL_CAPACITY	0xcc
> +#define LENOVO_EC_BAT_CURRENT		0xd2
> +#define LENOVO_EC_BAT_FULL_FACTORY	0xd6
> +#define LENOVO_EC_BAT_PRESENT		0xda
> +#define LENOVO_EC_BAT_FULL_REGISTER	0xdb
> +#define LENOVO_EC_BAT_FULL_IS_FACTORY	BIT(0)
> +
> +/* the mutex should already be locked */
> +static int yoga_c630_psy_update_bat_info(struct yoga_c630_psy *ecbat)
> +{
> +	struct yoga_c630_ec *ec = ecbat->ec;
> +	int val;
> +
> +	val = yoga_c630_ec_read8(ec, LENOVO_EC_BAT_PRESENT);
> +	if (val < 0)
> +		return val;
> +	ecbat->bat_present = !!(val & BIT(0));
> +	if (!ecbat->bat_present)
> +		return val;
> +
> +	val = yoga_c630_ec_read8(ec, LENOVO_EC_BAT_ATTRIBUTES);
> +	if (val < 0)
> +		return val;
> +	ecbat->unit_mA = val & LENOVO_EC_BAT_ATTR_UNIT_IS_MA;
> +
> +	val = yoga_c630_ec_read16(ec, LENOVO_EC_BAT_DESIGN_CAPACITY);
> +	if (val < 0)
> +		return val;
> +	ecbat->design_capacity = val * 1000;
> +
> +	msleep(50);

What's this for ? Also do you really want to hold a mutex for 50 
milliseconds ?

> +
> +	val = yoga_c630_ec_read16(ec, LENOVO_EC_BAT_DESIGN_VOLTAGE);
> +	if (val < 0)
> +		return val;
> +	ecbat->design_voltage = val;
> +
> +	msleep(50);

And again ?

I guess it doesn't really matter how long you hold your mutex but, some 
description of the delay in the code would be nice from a reader's 
perspective.

Same comment for the rest of the msleeps();

> +
> +	val = yoga_c630_ec_read8(ec, LENOVO_EC_BAT_FULL_REGISTER);
> +	if (val < 0)
> +		return val;
> +	if (val & LENOVO_EC_BAT_FULL_IS_FACTORY)
> +		val = yoga_c630_ec_read16(ec, LENOVO_EC_BAT_FULL_FACTORY);
> +	else
> +		val = yoga_c630_ec_read16(ec, LENOVO_EC_BAT_FULL_CAPACITY);
> +	if (val < 0)
> +		return val;
> +
> +	ecbat->full_charge_capacity = val * 1000;
> +
> +	if (!ecbat->unit_mA) {
> +		ecbat->design_capacity *= 10;
> +		ecbat->full_charge_capacity *= 10;
> +	}
> +
> +	return 0;
> +}
> +
> +/* the mutex should already be locked */
> +static int yoga_c630_psy_maybe_update_bat_status(struct yoga_c630_psy *ecbat)
> +{
> +	struct yoga_c630_ec *ec = ecbat->ec;
> +	int current_mA;
> +	int val;
> +
> +	if (time_before(jiffies, ecbat->last_status_update + LENOVO_EC_CACHE_TIME))
> +		return 0;
> +
> +	val = yoga_c630_ec_read8(ec, LENOVO_EC_BAT_STATUS);
> +	if (val < 0)
> +		return val;
> +	ecbat->bat_status = val;
> +
> +	msleep(50);
> +
> +	val = yoga_c630_ec_read16(ec, LENOVO_EC_BAT_REMAIN_CAPACITY);
> +	if (val < 0)
> +		return val;
> +	ecbat->capacity_now = val * 1000;
> +
> +	msleep(50);
> +
> +	val = yoga_c630_ec_read16(ec, LENOVO_EC_BAT_VOLTAGE);
> +	if (val < 0)
> +		return val;
> +	ecbat->voltage_now = val * 1000;
> +
> +	msleep(50);
> +
> +	val = yoga_c630_ec_read16(ec, LENOVO_EC_BAT_CURRENT);
> +	if (val < 0)
> +		return val;
> +	current_mA = sign_extend32(val, 15);
> +	ecbat->current_now = current_mA * 1000;
> +	ecbat->rate_now = current_mA * (ecbat->voltage_now / 1000);
> +
> +	msleep(50);
> +
> +	if (!ecbat->unit_mA)
> +		ecbat->capacity_now *= 10;
> +
> +	ecbat->last_status_update = jiffies;
> +
> +	return 0;
> +}
> +
> +static int yoga_c630_psy_update_adapter_status(struct yoga_c630_psy *ecbat)
> +{
> +	struct yoga_c630_ec *ec = ecbat->ec;
> +	int val;
> +
> +	mutex_lock(&ecbat->lock);
> +
> +	val = yoga_c630_ec_read8(ec, LENOVO_EC_ADPT_STATUS);
> +	if (val > 0)
> +		ecbat->adapter_online = FIELD_GET(LENOVO_EC_ADPT_PRESENT, val);
> +
> +	mutex_unlock(&ecbat->lock);
> +
> +	return val;
> +}
> +
> +static bool yoga_c630_psy_is_charged(struct yoga_c630_psy *ecbat)
> +{
> +	if (ecbat->bat_status != 0)
> +		return false;
> +
> +	if (ecbat->full_charge_capacity <= ecbat->capacity_now)
> +		return true;
> +
> +	if (ecbat->design_capacity <= ecbat->capacity_now)
> +		return true;
> +
> +	return false;
> +}
> +
> +static int yoga_c630_psy_bat_get_property(struct power_supply *psy,
> +					 enum power_supply_property psp,
> +					 union power_supply_propval *val)
> +{
> +	struct yoga_c630_psy *ecbat = power_supply_get_drvdata(psy);
> +	int rc = 0;
> +
> +	if (!ecbat->bat_present &&
> +	    psp != POWER_SUPPLY_PROP_PRESENT)
> +		return -ENODEV;
> +
> +	mutex_lock(&ecbat->lock);
> +	rc = yoga_c630_psy_maybe_update_bat_status(ecbat);
> +	mutex_unlock(&ecbat->lock);
> +
> +	if (rc)
> +		return rc;
> +
> +	switch (psp) {
> +	case POWER_SUPPLY_PROP_STATUS:
> +		if (ecbat->bat_status & BIT(0))
> +			val->intval = POWER_SUPPLY_STATUS_DISCHARGING;
> +		else if (ecbat->bat_status & BIT(1))

For preference I'd name these bits.

> +			val->intval = POWER_SUPPLY_STATUS_CHARGING;
> +		else if (yoga_c630_psy_is_charged(ecbat))
> +			val->intval = POWER_SUPPLY_STATUS_FULL;
> +		else
> +			val->intval = POWER_SUPPLY_STATUS_NOT_CHARGING;
> +		break;
> +	case POWER_SUPPLY_PROP_PRESENT:
> +		val->intval = ecbat->bat_present;
> +		break;
> +	case POWER_SUPPLY_PROP_VOLTAGE_MIN_DESIGN:
> +		val->intval = ecbat->design_voltage;
> +		break;
> +	case POWER_SUPPLY_PROP_CHARGE_FULL_DESIGN:
> +	case POWER_SUPPLY_PROP_ENERGY_FULL_DESIGN:
> +		val->intval = ecbat->design_capacity;
> +		break;
> +	case POWER_SUPPLY_PROP_CHARGE_FULL:
> +	case POWER_SUPPLY_PROP_ENERGY_FULL:
> +		val->intval = ecbat->full_charge_capacity;
> +		break;
> +	case POWER_SUPPLY_PROP_CHARGE_NOW:
> +	case POWER_SUPPLY_PROP_ENERGY_NOW:
> +		val->intval = ecbat->capacity_now;
> +		break;
> +	case POWER_SUPPLY_PROP_CURRENT_NOW:
> +		val->intval = ecbat->current_now;
> +		break;
> +	case POWER_SUPPLY_PROP_POWER_NOW:
> +		val->intval = ecbat->rate_now;
> +		break;
> +	case POWER_SUPPLY_PROP_VOLTAGE_NOW:
> +		val->intval = ecbat->voltage_now;
> +		break;
> +	case POWER_SUPPLY_PROP_TECHNOLOGY:
> +		val->intval = POWER_SUPPLY_TECHNOLOGY_LION;
> +		break;
> +	case POWER_SUPPLY_PROP_MODEL_NAME:
> +		val->strval = "PABAS0241231";
> +		break;
> +	case POWER_SUPPLY_PROP_MANUFACTURER:
> +		val->strval = "Compal";
> +		break;
> +	default:
> +		rc = -EINVAL;
> +		break;
> +	}
> +
> +	return rc;
> +}
> +
> +static enum power_supply_property yoga_c630_psy_bat_mA_properties[] = {
> +	POWER_SUPPLY_PROP_STATUS,
> +	POWER_SUPPLY_PROP_PRESENT,
> +	POWER_SUPPLY_PROP_VOLTAGE_MIN_DESIGN,
> +	POWER_SUPPLY_PROP_CHARGE_FULL_DESIGN,
> +	POWER_SUPPLY_PROP_CHARGE_FULL,
> +	POWER_SUPPLY_PROP_CHARGE_NOW,
> +	POWER_SUPPLY_PROP_CURRENT_NOW,
> +	POWER_SUPPLY_PROP_POWER_NOW,
> +	POWER_SUPPLY_PROP_VOLTAGE_NOW,
> +	POWER_SUPPLY_PROP_TECHNOLOGY,
> +	POWER_SUPPLY_PROP_MODEL_NAME,
> +	POWER_SUPPLY_PROP_MANUFACTURER,
> +};
> +
> +static enum power_supply_property yoga_c630_psy_bat_mWh_properties[] = {
> +	POWER_SUPPLY_PROP_STATUS,
> +	POWER_SUPPLY_PROP_PRESENT,
> +	POWER_SUPPLY_PROP_VOLTAGE_MIN_DESIGN,
> +	POWER_SUPPLY_PROP_ENERGY_FULL_DESIGN,
> +	POWER_SUPPLY_PROP_ENERGY_FULL,
> +	POWER_SUPPLY_PROP_ENERGY_NOW,
> +	POWER_SUPPLY_PROP_CURRENT_NOW,
> +	POWER_SUPPLY_PROP_POWER_NOW,
> +	POWER_SUPPLY_PROP_VOLTAGE_NOW,
> +	POWER_SUPPLY_PROP_TECHNOLOGY,
> +	POWER_SUPPLY_PROP_MODEL_NAME,
> +	POWER_SUPPLY_PROP_MANUFACTURER,
> +};
> +
> +static const struct power_supply_desc yoga_c630_psy_bat_psy_desc_mA = {
> +	.name = "yoga-c630-battery",
> +	.type = POWER_SUPPLY_TYPE_BATTERY,
> +	.properties = yoga_c630_psy_bat_mA_properties,
> +	.num_properties = ARRAY_SIZE(yoga_c630_psy_bat_mA_properties),
> +	.get_property = yoga_c630_psy_bat_get_property,
> +};
> +
> +static const struct power_supply_desc yoga_c630_psy_bat_psy_desc_mWh = {
> +	.name = "yoga-c630-battery",
> +	.type = POWER_SUPPLY_TYPE_BATTERY,
> +	.properties = yoga_c630_psy_bat_mWh_properties,
> +	.num_properties = ARRAY_SIZE(yoga_c630_psy_bat_mWh_properties),
> +	.get_property = yoga_c630_psy_bat_get_property,
> +};
> +
> +static int yoga_c630_psy_adpt_get_property(struct power_supply *psy,
> +					  enum power_supply_property psp,
> +					  union power_supply_propval *val)
> +{
> +	struct yoga_c630_psy *ecbat = power_supply_get_drvdata(psy);
> +	int rc = 0;
> +
> +	yoga_c630_psy_update_adapter_status(ecbat);
> +
> +	switch (psp) {
> +	case POWER_SUPPLY_PROP_ONLINE:
> +		val->intval = ecbat->adapter_online;
> +		break;
> +	default:
> +		rc = -EINVAL;
> +		break;
> +	}
> +
> +	return rc;
> +}
> +
> +static enum power_supply_property yoga_c630_psy_adpt_properties[] = {
> +	POWER_SUPPLY_PROP_ONLINE,
> +};
> +
> +static const struct power_supply_desc yoga_c630_psy_adpt_psy_desc = {
> +	.name = "yoga-c630-adapter",
> +	.type = POWER_SUPPLY_TYPE_USB_TYPE_C,
> +	.properties = yoga_c630_psy_adpt_properties,
> +	.num_properties = ARRAY_SIZE(yoga_c630_psy_adpt_properties),
> +	.get_property = yoga_c630_psy_adpt_get_property,
> +};
> +
> +static int yoga_c630_psy_register_bat_psy(struct yoga_c630_psy *ecbat)
> +{
> +	struct power_supply_config bat_cfg = {};
> +
> +	bat_cfg.drv_data = ecbat;
> +	bat_cfg.of_node = ecbat->of_node;
> +	if (ecbat->unit_mA)
> +		ecbat->bat_psy = power_supply_register_no_ws(ecbat->dev, &yoga_c630_psy_bat_psy_desc_mA, &bat_cfg);
> +	else
> +		ecbat->bat_psy = power_supply_register_no_ws(ecbat->dev, &yoga_c630_psy_bat_psy_desc_mWh, &bat_cfg);

These look a bit long, in the other driver in this series you're capping 
at whatever it is 75 or 80 characters.

TBH I think I prefer the longer line above maybe consider elongating the 
length of the line in the previous driver or curtailing to 80 here.

But I think you should have a consistent line lenght in the same series.

> +	if (IS_ERR(ecbat->bat_psy)) {
> +		dev_err(ecbat->dev, "failed to register battery supply\n");
> +		return PTR_ERR(ecbat->bat_psy);
> +	}
> +
> +	return 0;
> +}
> +
> +static void yoga_c630_ec_refresh_bat_info(struct yoga_c630_psy *ecbat)
> +{
> +	bool current_unit;
> +
> +	mutex_lock(&ecbat->lock);
> +	current_unit = ecbat->unit_mA;
> +
> +	yoga_c630_psy_update_bat_info(ecbat);
> +
> +	if (current_unit != ecbat->unit_mA) {
> +		power_supply_unregister(ecbat->bat_psy);
> +		yoga_c630_psy_register_bat_psy(ecbat);
> +	}
> +
> +	mutex_unlock(&ecbat->lock);
> +}
> +
> +static int yoga_c630_psy_notify(struct notifier_block *nb,
> +				unsigned long action, void *data)
> +{
> +	struct yoga_c630_psy *ecbat = container_of(nb, struct yoga_c630_psy, nb);
> +
> +	switch (action) {
> +	case LENOVO_EC_EVENT_BAT_INFO:
> +		yoga_c630_ec_refresh_bat_info(ecbat);
> +		break;
> +	case LENOVO_EC_EVENT_BAT_ADPT_STATUS:
> +		power_supply_changed(ecbat->adp_psy);
> +		fallthrough;
> +	case LENOVO_EC_EVENT_BAT_STATUS:
> +		power_supply_changed(ecbat->bat_psy);
> +		break;
> +	}
> +
> +	return NOTIFY_OK;
> +}
> +
> +static int yoga_c630_psy_probe(struct auxiliary_device *adev,
> +				   const struct auxiliary_device_id *id)
> +{
> +	struct yoga_c630_ec *ec = adev->dev.platform_data;
> +	struct power_supply_config adp_cfg = {};
> +	struct device *dev = &adev->dev;
> +	struct yoga_c630_psy *ecbat;
> +	int ret;
> +
> +	ecbat = devm_kzalloc(&adev->dev, sizeof(*ecbat), GFP_KERNEL);
> +	if (!ecbat)
> +		return -ENOMEM;
> +
> +	ecbat->ec = ec;
> +	ecbat->dev = dev;
> +	mutex_init(&ecbat->lock);
> +	ecbat->of_node = adev->dev.parent->of_node;
> +	ecbat->nb.notifier_call = yoga_c630_psy_notify;
> +
> +	auxiliary_set_drvdata(adev, ecbat);
> +
> +	adp_cfg.drv_data = ecbat;
> +	adp_cfg.of_node = ecbat->of_node;
> +	adp_cfg.supplied_to = (char **)&yoga_c630_psy_bat_psy_desc_mA.name;
> +	adp_cfg.num_supplicants = 1;
> +	ecbat->adp_psy = devm_power_supply_register_no_ws(dev, &yoga_c630_psy_adpt_psy_desc, &adp_cfg);
> +	if (IS_ERR(ecbat->adp_psy)) {
> +		dev_err(dev, "failed to register AC adapter supply\n");
> +		return PTR_ERR(ecbat->adp_psy);
> +	}
> +
> +	mutex_lock(&ecbat->lock);

Do you really need this lock here in your probe() function ? What's the 
parallel path of execution you are mitigating against here ?

> +
> +	ret = yoga_c630_psy_update_bat_info(ecbat);
> +	if (ret)
> +		goto err_unlock;
> +
> +	ret = yoga_c630_psy_register_bat_psy(ecbat);
> +	if (ret)
> +		goto err_unlock;
> +
> +	mutex_unlock(&ecbat->lock);
> +
> +	ret = yoga_c630_ec_register_notify(ecbat->ec, &ecbat->nb);
> +	if (ret)
> +		goto err_unreg_bat;
> +
> +	return 0;
> +
> +err_unlock:
> +	mutex_unlock(&ecbat->lock);
> +
> +err_unreg_bat:
> +	power_supply_unregister(ecbat->bat_psy);
> +	return ret;
> +}
> +
> +static void yoga_c630_psy_remove(struct auxiliary_device *adev)
> +{
> +	struct yoga_c630_psy *ecbat = auxiliary_get_drvdata(adev);
> +
> +	yoga_c630_ec_unregister_notify(ecbat->ec, &ecbat->nb);
> +	power_supply_unregister(ecbat->bat_psy);
> +}
> +
> +static const struct auxiliary_device_id yoga_c630_psy_id_table[] = {
> +	{ .name = YOGA_C630_MOD_NAME "." YOGA_C630_DEV_PSY, },
> +	{}
> +};
> +MODULE_DEVICE_TABLE(auxiliary, yoga_c630_psy_id_table);
> +
> +static struct auxiliary_driver yoga_c630_psy_driver = {
> +	.name = YOGA_C630_DEV_PSY,
> +	.id_table = yoga_c630_psy_id_table,
> +	.probe = yoga_c630_psy_probe,
> +	.remove = yoga_c630_psy_remove,
> +};
> +
> +module_auxiliary_driver(yoga_c630_psy_driver);
> +
> +MODULE_DESCRIPTION("Lenovo Yoga C630 psy");
> +MODULE_LICENSE("GPL");
> 

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