Re: [PATCH v2 5/7] platform/x86: uniwill-laptop: Rework FN lock/super key suspend handling

[Ilpo Järvinen]

On Fri, 17 Apr 2026, Armin Wolf wrote:

> Currently the suspend handling for the FN lock and super key enable
> features saves the whole values of the affected registers instead of
> the individual feature state. This duplicates the register access
> logic from the associated sysfs attributes.
> 
> Rework the suspend handling to reuse said register access logic and
> only store the individual feature state as a boolean value.
> 
> Reviewed-by: Werner Sembach <wse@xxxxxxxxxxxxxxxxxxx>
> Signed-off-by: Armin Wolf <W_Armin@xxxxxx>
> ---
>  drivers/platform/x86/uniwill/uniwill-acpi.c | 117 ++++++++++++--------
>  1 file changed, 73 insertions(+), 44 deletions(-)
> 
> diff --git a/drivers/platform/x86/uniwill/uniwill-acpi.c b/drivers/platform/x86/uniwill/uniwill-acpi.c
> index dac80c78ca0b..8c00d762ab08 100644
> --- a/drivers/platform/x86/uniwill/uniwill-acpi.c
> +++ b/drivers/platform/x86/uniwill/uniwill-acpi.c
> @@ -341,8 +341,8 @@ struct uniwill_data {
>  	struct acpi_battery_hook hook;
>  	unsigned int last_charge_ctrl;
>  	struct mutex battery_lock;	/* Protects the list of currently registered batteries */
> -	unsigned int last_status;
> -	unsigned int last_switch_status;
> +	bool last_fn_lock_state;
> +	bool last_super_key_enable_state;
>  	struct mutex super_key_lock;	/* Protects the toggling of the super key lock state */
>  	struct list_head batteries;
>  	struct mutex led_lock;		/* Protects writes to the lightbar registers */
> @@ -619,11 +619,22 @@ static const struct regmap_config uniwill_ec_config = {
>  	.use_single_write = true,
>  };
>  
> +static int uniwill_write_fn_lock(struct uniwill_data *data, bool status)
> +{
> +	unsigned int value;
> +
> +	if (status)
> +		value = FN_LOCK_STATUS;
> +	else
> +		value = 0;
> +
> +	return regmap_update_bits(data->regmap, EC_ADDR_BIOS_OEM, FN_LOCK_STATUS, value);
> +}
> +
>  static ssize_t fn_lock_store(struct device *dev, struct device_attribute *attr, const char *buf,
>  			     size_t count)
>  {
>  	struct uniwill_data *data = dev_get_drvdata(dev);
> -	unsigned int value;
>  	bool enable;
>  	int ret;
>  
> @@ -631,21 +642,15 @@ static ssize_t fn_lock_store(struct device *dev, struct device_attribute *attr,
>  	if (ret < 0)
>  		return ret;
>  
> -	if (enable)
> -		value = FN_LOCK_STATUS;
> -	else
> -		value = 0;
> -
> -	ret = regmap_update_bits(data->regmap, EC_ADDR_BIOS_OEM, FN_LOCK_STATUS, value);
> +	ret = uniwill_write_fn_lock(data, enable);
>  	if (ret < 0)
>  		return ret;
>  
>  	return count;
>  }
>  
> -static ssize_t fn_lock_show(struct device *dev, struct device_attribute *attr, char *buf)
> +static int uniwill_read_fn_lock(struct uniwill_data *data, bool *status)
>  {
> -	struct uniwill_data *data = dev_get_drvdata(dev);
>  	unsigned int value;
>  	int ret;
>  
> @@ -653,23 +658,31 @@ static ssize_t fn_lock_show(struct device *dev, struct device_attribute *attr, c
>  	if (ret < 0)
>  		return ret;
>  
> -	return sysfs_emit(buf, "%d\n", !!(value & FN_LOCK_STATUS));
> -}
> +	*status = !!(value & FN_LOCK_STATUS);
>  
> -static DEVICE_ATTR_RW(fn_lock);
> +	return 0;
> +}
>  
> -static ssize_t super_key_enable_store(struct device *dev, struct device_attribute *attr,
> -				      const char *buf, size_t count)
> +static ssize_t fn_lock_show(struct device *dev, struct device_attribute *attr, char *buf)
>  {
>  	struct uniwill_data *data = dev_get_drvdata(dev);
> -	unsigned int value;
> -	bool enable;
> +	bool status;
>  	int ret;
>  
> -	ret = kstrtobool(buf, &enable);
> +	ret = uniwill_read_fn_lock(data, &status);
>  	if (ret < 0)
>  		return ret;
>  
> +	return sysfs_emit(buf, "%d\n", status);
> +}
> +
> +static DEVICE_ATTR_RW(fn_lock);
> +
> +static int uniwill_write_super_key_enable(struct uniwill_data *data, bool status)
> +{
> +	unsigned int value;
> +	int ret;
> +
>  	guard(mutex)(&data->super_key_lock);
>  
>  	ret = regmap_read(data->regmap, EC_ADDR_SWITCH_STATUS, &value);
> @@ -680,20 +693,33 @@ static ssize_t super_key_enable_store(struct device *dev, struct device_attribut
>  	 * We can only toggle the super key lock, so we return early if the setting
>  	 * is already in the correct state.
>  	 */
> -	if (enable == !(value & SUPER_KEY_LOCK_STATUS))
> -		return count;
> +	if (status == !(value & SUPER_KEY_LOCK_STATUS))
> +		return 0;
> +
> +	return regmap_write_bits(data->regmap, EC_ADDR_TRIGGER, TRIGGER_SUPER_KEY_LOCK,
> +				 TRIGGER_SUPER_KEY_LOCK);
> +}
> +
> +static ssize_t super_key_enable_store(struct device *dev, struct device_attribute *attr,
> +				      const char *buf, size_t count)
> +{
> +	struct uniwill_data *data = dev_get_drvdata(dev);
> +	bool enable;
> +	int ret;
>  
> -	ret = regmap_write_bits(data->regmap, EC_ADDR_TRIGGER, TRIGGER_SUPER_KEY_LOCK,
> -				TRIGGER_SUPER_KEY_LOCK);
> +	ret = kstrtobool(buf, &enable);
> +	if (ret < 0)
> +		return ret;
> +
> +	ret = uniwill_write_super_key_enable(data, enable);
>  	if (ret < 0)
>  		return ret;
>  
>  	return count;
>  }
>  
> -static ssize_t super_key_enable_show(struct device *dev, struct device_attribute *attr, char *buf)
> +static int uniwill_read_super_key_enable(struct uniwill_data *data, bool *status)
>  {
> -	struct uniwill_data *data = dev_get_drvdata(dev);
>  	unsigned int value;
>  	int ret;
>  
> @@ -701,7 +727,22 @@ static ssize_t super_key_enable_show(struct device *dev, struct device_attribute
>  	if (ret < 0)
>  		return ret;
>  
> -	return sysfs_emit(buf, "%d\n", !(value & SUPER_KEY_LOCK_STATUS));
> +	*status = !(value & SUPER_KEY_LOCK_STATUS);
> +
> +	return 0;
> +}
> +
> +static ssize_t super_key_enable_show(struct device *dev, struct device_attribute *attr, char *buf)
> +{
> +	struct uniwill_data *data = dev_get_drvdata(dev);
> +	bool status;
> +	int ret;
> +
> +	ret = uniwill_read_super_key_enable(data, &status);
> +	if (ret < 0)
> +		return ret;
> +
> +	return sysfs_emit(buf, "%d\n", status);
>  }
>  
>  static DEVICE_ATTR_RW(super_key_enable);
> @@ -1715,10 +1756,10 @@ static int uniwill_suspend_fn_lock(struct uniwill_data *data)
>  		return 0;
>  
>  	/*
> -	 * The EC_ADDR_BIOS_OEM is marked as volatile, so we have to restore it
> +	 * EC_ADDR_BIOS_OEM is marked as volatile, so we have to restore it
>  	 * ourselves.
>  	 */
> -	return regmap_read(data->regmap, EC_ADDR_BIOS_OEM, &data->last_status);
> +	return uniwill_read_fn_lock(data, &data->last_fn_lock_state);
>  }
>  
>  static int uniwill_suspend_super_key(struct uniwill_data *data)
> @@ -1727,10 +1768,10 @@ static int uniwill_suspend_super_key(struct uniwill_data *data)
>  		return 0;
>  
>  	/*
> -	 * The EC_ADDR_SWITCH_STATUS is marked as volatile, so we have to restore it
> +	 * EC_ADDR_SWITCH_STATUS is marked as volatile, so we have to restore it
>  	 * ourselves.
>  	 */
> -	return regmap_read(data->regmap, EC_ADDR_SWITCH_STATUS, &data->last_switch_status);
> +	return uniwill_read_super_key_enable(data, &data->last_super_key_enable_state);
>  }
>  
>  static int uniwill_suspend_battery(struct uniwill_data *data)
> @@ -1787,27 +1828,15 @@ static int uniwill_resume_fn_lock(struct uniwill_data *data)
>  	if (!uniwill_device_supports(data, UNIWILL_FEATURE_FN_LOCK))
>  		return 0;
>  
> -	return regmap_update_bits(data->regmap, EC_ADDR_BIOS_OEM, FN_LOCK_STATUS,
> -				  data->last_status);
> +	return uniwill_write_fn_lock(data, data->last_fn_lock_state);
>  }
>  
>  static int uniwill_resume_super_key(struct uniwill_data *data)
>  {
> -	unsigned int value;
> -	int ret;
> -
>  	if (!uniwill_device_supports(data, UNIWILL_FEATURE_SUPER_KEY))
>  		return 0;
>  
> -	ret = regmap_read(data->regmap, EC_ADDR_SWITCH_STATUS, &value);
> -	if (ret < 0)
> -		return ret;
> -
> -	if ((data->last_switch_status & SUPER_KEY_LOCK_STATUS) == (value & SUPER_KEY_LOCK_STATUS))
> -		return 0;
> -
> -	return regmap_write_bits(data->regmap, EC_ADDR_TRIGGER, TRIGGER_SUPER_KEY_LOCK,
> -				 TRIGGER_SUPER_KEY_LOCK);
> +	return uniwill_write_super_key_enable(data, data->last_super_key_enable_state);
>  }
>  
>  static int uniwill_resume_battery(struct uniwill_data *data)
> 

Reviewed-by: Ilpo Järvinen <ilpo.jarvinen@xxxxxxxxxxxxxxx>

-- 
 i.