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Commit 508df92d authored by Andrey Borzenkov's avatar Andrey Borzenkov Committed by Len Brown
Browse files

ACPI: battery: register power_supply subdevice only when battery is present 



Make sure no power_supply object is present unless we actualy detect
presence of battery. This fixes ghost batteries detected by HAL

Signed-off-by: default avatarAndrey Borzenkov <arvidjaar@mail.ru>
Signed-off-by: default avatarAlexey Starikovskiy <astarikovskiy@suse.de>
Signed-off-by: default avatarLen Brown <len.brown@intel.com>
parent b19073a0

drivers/acpi/battery.c

+75 −55
Original line number Diff line number Diff line
@@ -388,16 +388,40 @@ static int acpi_battery_init_alarm(struct acpi_battery *battery) 
	return acpi_battery_set_alarm(battery);

}



static int acpi_battery_update(struct acpi_battery *battery)

static ssize_t acpi_battery_alarm_show(struct device *dev,

					struct device_attribute *attr,

					char *buf)

{

	int saved_present = acpi_battery_present(battery);

	int result = acpi_battery_get_status(battery);

	if (result || !acpi_battery_present(battery))

		return result;

	if (saved_present != acpi_battery_present(battery) ||

	    !battery->update_time) {

	struct acpi_battery *battery = to_acpi_battery(dev_get_drvdata(dev));

	return sprintf(buf, "%d\n", battery->alarm * 1000);

}



static ssize_t acpi_battery_alarm_store(struct device *dev,

					struct device_attribute *attr,

					const char *buf, size_t count)

{

	unsigned long x;

	struct acpi_battery *battery = to_acpi_battery(dev_get_drvdata(dev));

	if (sscanf(buf, "%ld\n", &x) == 1)

		battery->alarm = x/1000;

	if (acpi_battery_present(battery))

		acpi_battery_set_alarm(battery);

	return count;

}



static struct device_attribute alarm_attr = {

	.attr = {.name = "alarm", .mode = 0644, .owner = THIS_MODULE},

	.show = acpi_battery_alarm_show,

	.store = acpi_battery_alarm_store,

};



static int sysfs_add_battery(struct acpi_battery *battery)

{

	int result;



	battery->update_time = 0;

	result = acpi_battery_get_info(battery);

	acpi_battery_init_alarm(battery);

	if (result)

		return result;

	if (battery->power_unit) {
@@ -409,8 +433,36 @@ static int acpi_battery_update(struct acpi_battery *battery) 
		battery->bat.num_properties =

			ARRAY_SIZE(energy_battery_props);

	}

		acpi_battery_init_alarm(battery);



	battery->bat.name = acpi_device_bid(battery->device);

	battery->bat.type = POWER_SUPPLY_TYPE_BATTERY;

	battery->bat.get_property = acpi_battery_get_property;



	result = power_supply_register(&battery->device->dev, &battery->bat);

	if (result)

		return result;

	return device_create_file(battery->bat.dev, &alarm_attr);

}



static void sysfs_remove_battery(struct acpi_battery *battery)

{

	if (!battery->bat.dev)

		return;

	device_remove_file(battery->bat.dev, &alarm_attr);

	power_supply_unregister(&battery->bat);

}



static int acpi_battery_update(struct acpi_battery *battery)

{

	int result = acpi_battery_get_status(battery);

	if (result)

		return result;

	if (!acpi_battery_present(battery)) {

		sysfs_remove_battery(battery);

		return 0;

	}

	if (!battery->bat.dev)

		sysfs_add_battery(battery);

	return acpi_battery_get_state(battery);

}
@@ -687,33 +739,6 @@ static void acpi_battery_remove_fs(struct acpi_device *device) 


#endif



static ssize_t acpi_battery_alarm_show(struct device *dev,

					struct device_attribute *attr,

					char *buf)

{

	struct acpi_battery *battery = to_acpi_battery(dev_get_drvdata(dev));

	return sprintf(buf, "%d\n", battery->alarm * 1000);

}



static ssize_t acpi_battery_alarm_store(struct device *dev,

					struct device_attribute *attr,

					const char *buf, size_t count)

{

	unsigned long x;

	struct acpi_battery *battery = to_acpi_battery(dev_get_drvdata(dev));

	if (sscanf(buf, "%ld\n", &x) == 1)

		battery->alarm = x/1000;

	if (acpi_battery_present(battery))

		acpi_battery_set_alarm(battery);

	return count;

}



static struct device_attribute alarm_attr = {

	.attr = {.name = "alarm", .mode = 0644, .owner = THIS_MODULE},

	.show = acpi_battery_alarm_show,

	.store = acpi_battery_alarm_store,

};



/* --------------------------------------------------------------------------

                                 Driver Interface

   -------------------------------------------------------------------------- */
@@ -731,6 +756,8 @@ static void acpi_battery_notify(acpi_handle handle, u32 event, void *data) 
	acpi_bus_generate_netlink_event(device->pnp.device_class,

					device->dev.bus_id, event,

					acpi_battery_present(battery));

	/* acpi_batter_update could remove power_supply object */

	if (battery->bat.dev)

		kobject_uevent(&battery->bat.dev->kobj, KOBJ_CHANGE);

}
@@ -755,11 +782,6 @@ static int acpi_battery_add(struct acpi_device *device) 
	if (result)

		goto end;

#endif

	battery->bat.name = acpi_device_bid(device);

	battery->bat.type = POWER_SUPPLY_TYPE_BATTERY;

	battery->bat.get_property = acpi_battery_get_property;

	result = power_supply_register(&battery->device->dev, &battery->bat);

	result = device_create_file(battery->bat.dev, &alarm_attr);

	status = acpi_install_notify_handler(device->handle,

					     ACPI_ALL_NOTIFY,

					     acpi_battery_notify, battery);
@@ -795,10 +817,7 @@ static int acpi_battery_remove(struct acpi_device *device, int type) 
#ifdef CONFIG_ACPI_PROCFS

	acpi_battery_remove_fs(device);

#endif

	if (battery->bat.dev) {

		device_remove_file(battery->bat.dev, &alarm_attr);

		power_supply_unregister(&battery->bat);

	}

	sysfs_remove_battery(battery);

	mutex_destroy(&battery->lock);

	kfree(battery);

	return 0;
@@ -812,6 +831,7 @@ static int acpi_battery_resume(struct acpi_device *device) 
		return -EINVAL;

	battery = acpi_driver_data(device);

	battery->update_time = 0;

	acpi_battery_update(battery);

	return 0;

}