linux-kernel - Re: [PATCH] ACPI / battery: add quirk for Asus GL502VSK and UX305LA

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Date:   Tue, 21 Nov 2017 02:14:59 +0100
From:   "Rafael J. Wysocki" <rjw@...ysocki.net>
To:     Kai-Heng Feng <kai.heng.feng@...onical.com>
Cc:     lenb@...nel.org, linux-acpi@...r.kernel.org,
        linux-kernel@...r.kernel.org
Subject: Re: [PATCH] ACPI / battery: add quirk for Asus GL502VSK and UX305LA

On Friday, September 22, 2017 10:27:44 AM CET Kai-Heng Feng wrote:
> On Asus GL502VSK and UX305LA, ACPI incorrectly reports discharging when
> battery is full and AC is plugged.
> 
> However rate_now is correct under this circumstance, hence we can use
> "rate_now == 0" as a predicate to report battery full status correctly.
> 
> BugLink: https://bugs.launchpad.net/bugs/1482390
> Signed-off-by: Kai-Heng Feng <kai.heng.feng@...onical.com>
> ---
>  drivers/acpi/battery.c | 29 ++++++++++++++++++++++++++++-
>  1 file changed, 28 insertions(+), 1 deletion(-)
> 
> diff --git a/drivers/acpi/battery.c b/drivers/acpi/battery.c
> index 13e7b56e33ae..f9f008cf3da7 100644
> --- a/drivers/acpi/battery.c
> +++ b/drivers/acpi/battery.c
> @@ -70,6 +70,7 @@ static async_cookie_t async_cookie;
>  static bool battery_driver_registered;
>  static int battery_bix_broken_package;
>  static int battery_notification_delay_ms;
> +static int battery_full_discharging;
>  static unsigned int cache_time = 1000;
>  module_param(cache_time, uint, 0644);
>  MODULE_PARM_DESC(cache_time, "cache time in milliseconds");
> @@ -214,7 +215,10 @@ static int acpi_battery_get_property(struct power_supply *psy,
>  		return -ENODEV;
>  	switch (psp) {
>  	case POWER_SUPPLY_PROP_STATUS:
> -		if (battery->state & ACPI_BATTERY_STATE_DISCHARGING)
> +		if (battery_full_discharging && battery->rate_now == 0 &&
> +		    battery->state & ACPI_BATTERY_STATE_DISCHARGING)
> +			val->intval = POWER_SUPPLY_STATUS_FULL;
> +		else if (battery->state & ACPI_BATTERY_STATE_DISCHARGING)

You are adding a special sub-case to the
(battery->state & ACPI_BATTERY_STATE_DISCHARGING) case, so it would be cleaner
to do that in the following way:

if (battery->state & ACPI_BATTERY_STATE_DISCHARGING) {
	if (battery_full_discharging && battery->rate_now == 0)
		val->intval = POWER_SUPPLY_STATUS_FULL;
	else
		val->intval = POWER_SUPPLY_STATUS_DISCHARGING;
} else if (battery->state & ACPI_BATTERY_STATE_CHARGING) {
	val->intval = POWER_SUPPLY_STATUS_CHARGING;
}

>  			val->intval = POWER_SUPPLY_STATUS_DISCHARGING;
>  		else if (battery->state & ACPI_BATTERY_STATE_CHARGING)
>  			val->intval = POWER_SUPPLY_STATUS_CHARGING;
> @@ -1166,6 +1170,13 @@ battery_notification_delay_quirk(const struct dmi_system_id *d)
>  	return 0;
>  }
>  
> +static int __init
> +battery_full_discharging_quirk(const struct dmi_system_id *d)
> +{
> +	battery_full_discharging = 1;
> +	return 0;
> +}
> +
>  static const struct dmi_system_id bat_dmi_table[] __initconst = {
>  	{
>  		.callback = battery_bix_broken_package_quirk,
> @@ -1183,6 +1194,22 @@ static const struct dmi_system_id bat_dmi_table[] __initconst = {
>  			DMI_MATCH(DMI_PRODUCT_NAME, "Aspire V5-573G"),
>  		},
>  	},
> +	{
> +		.callback = battery_full_discharging_quirk,
> +		.ident = "ASUS GL502VSK",
> +		.matches = {
> +			DMI_MATCH(DMI_SYS_VENDOR, "ASUSTeK COMPUTER INC."),
> +			DMI_MATCH(DMI_PRODUCT_NAME, "GL502VSK"),
> +		},
> +	},
> +	{
> +		.callback = battery_full_discharging_quirk,
> +		.ident = "ASUS UX305LA",
> +		.matches = {
> +			DMI_MATCH(DMI_SYS_VENDOR, "ASUSTeK COMPUTER INC."),
> +			DMI_MATCH(DMI_PRODUCT_NAME, "UX305LA"),
> +		},
> +	},
>  	{},
>  };
>  
> 

Thanks,
Rafael