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@xxxxxxxxx>
---
v2: watch only for ACPI_BATTERY_NOTIFY_STATUS, add comment
drivers/acpi/ac.c | 25 +++++++++++++++++++++++++
1 file changed, 25 insertions(+)
diff --git a/drivers/acpi/ac.c b/drivers/acpi/ac.c
index 6f190bc..2c01c1d 100644
--- a/drivers/acpi/ac.c
+++ b/drivers/acpi/ac.c
@@ -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);
--
1.9.0
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