[PATCH] 2.6.24-rc1: ensure "present" sysfs attribute even if battery is absent

[Andrey Borzenkov <arvidjaar@mail.ru>]

I am not exactly sure about this one ... what other power_supply class drivers 
do? Should I fix HAL instead (but then, I do not know whether HAL is the only 
application that is using this interface).

Subject: [PATCH] 2.6.24-rc1: ensure "present" sysfs attribute even if battery is absent
From: Andrey Borzenkov <arvidjaar@mail.ru>

Ensure that we always have "present" attribute in sysfs. This is compatible
with procfs case where we had "present: no" if battery was not available.

This fixes HAL battery detection where it does pretend battery is present
but canot provide any value for it.

Signed-off-by: Andrey Borzenkov <arvidjaar@mail.ru>

---

 drivers/acpi/battery.c |   11 ++++++++++-
 1 files changed, 10 insertions(+), 1 deletions(-)

diff --git a/drivers/acpi/battery.c b/drivers/acpi/battery.c
index 681e26b..6e67fcd 100644
--- a/drivers/acpi/battery.c
+++ b/drivers/acpi/battery.c
@@ -187,6 +187,10 @@ static int acpi_battery_get_property(struct power_supply *psy,
 	return 0;
 }
 
+static enum power_supply_property missing_battery_props[] = {
+	POWER_SUPPLY_PROP_PRESENT,
+};
+
 static enum power_supply_property charge_battery_props[] = {
 	POWER_SUPPLY_PROP_STATUS,
 	POWER_SUPPLY_PROP_PRESENT,
@@ -389,8 +393,13 @@ static int acpi_battery_update(struct acpi_battery *battery)
 {
 	int saved_present = acpi_battery_present(battery);
 	int result = acpi_battery_get_status(battery);
-	if (result || !acpi_battery_present(battery))
+	if (result)
 		return result;
+	if (!acpi_battery_present(battery)) {
+		battery->bat.properties = missing_battery_props;
+		battery->bat.num_properties = ARRAY_SIZE(missing_battery_props);
+		return result;
+	}
 	if (saved_present != acpi_battery_present(battery) ||
 	    !battery->update_time) {
 		battery->update_time = 0;

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