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ACPI / AC: recheck adapter status upon battery status changes

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On HP Pavilion dv6-6179er there are no notifications when AC adapter
is plugged/unplugged.
However, when AC status is read (acpi_ac_get_state), and if AC status
has changed, AML code triggers the notification.

This patch solves the problem by re-reading AC adapter status upon
ACPI_BATTERY_NOTIFY_STATUS notification.

Signed-off-by: Alexander Mezin <mezin.alexander@gmail.com>
Acked-by: Lan Tianyu <tianyu.lan@intel.com>
Signed-off-by: Rafael J. Wysocki <rafael.j.wysocki@intel.com>
This commit is contained in:
Alexander Mezin 2014-03-12 00:58:48 +07:00 committed by Rafael J. Wysocki
parent 411e0f77bd
commit 4eee4f03ce
1 changed files with 25 additions and 0 deletions
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25
drivers/acpi/ac.c
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@ -33,6 +33,7 @@
#include <linux/platform_device.h>
#include <linux/power_supply.h>
#include <linux/acpi.h>
#include "battery.h"
#define PREFIX "ACPI: "
@ -57,6 +58,7 @@ struct acpi_ac {
struct power_supply charger;
struct platform_device *pdev;
unsigned long long state;
struct notifier_block battery_nb;
};
#define to_acpi_ac(x) container_of(x, struct acpi_ac, charger)
@ -152,6 +154,26 @@ static void acpi_ac_notify_handler(acpi_handle handle, u32 event, void *data)
return;
}
static int acpi_ac_battery_notify(struct notifier_block *nb,
unsigned long action, void *data)
{
struct acpi_ac *ac = container_of(nb, struct acpi_ac, battery_nb);
struct acpi_bus_event *event = (struct acpi_bus_event *)data;
/*
* On HP Pavilion dv6-6179er AC status notifications aren't triggered
* when adapter is plugged/unplugged. However, battery status
* notifcations are triggered when battery starts charging or
* discharging. Re-reading AC status triggers lost AC notifications,
* if AC status has changed.
*/
if (strcmp(event->device_class, ACPI_BATTERY_CLASS) == 0 &&
event->type == ACPI_BATTERY_NOTIFY_STATUS)
acpi_ac_get_state(ac);
return NOTIFY_OK;
}
static int thinkpad_e530_quirk(const struct dmi_system_id *d)
{
ac_sleep_before_get_state_ms = 1000;
@ -215,6 +237,8 @@ static int acpi_ac_probe(struct platform_device *pdev)
acpi_device_name(adev), acpi_device_bid(adev),
ac->state ? "on-line" : "off-line");
ac->battery_nb.notifier_call = acpi_ac_battery_notify;
register_acpi_notifier(&ac->battery_nb);
end:
if (result)
kfree(ac);
@ -261,6 +285,7 @@ static int acpi_ac_remove(struct platform_device *pdev)
ac = platform_get_drvdata(pdev);
if (ac->charger.dev)
power_supply_unregister(&ac->charger);
unregister_acpi_notifier(&ac->battery_nb);
kfree(ac);