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Commit 3031cdde authored by Matthew Garrett's avatar Matthew Garrett Committed by Rafael J. Wysocki
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ACPI / SBS: Don't assume the existence of an SBS charger 



Apple hardware continues to expose an ACPI AC charger even when using
SBS to report battery state. The charger status byte returns all 0s in
this case.  Since the spec requires that bit 4 be 1 at all times, assume
that there's not really a charger if it's set to zero.

Signed-off-by: default avatarMatthew Garrett <matthew.garrett@nebula.com>
Signed-off-by: default avatarAndreas Noever <andreas.noever@gmail.com>
Signed-off-by: default avatarRafael J. Wysocki <rafael.j.wysocki@intel.com>
parent 0f33be00

drivers/acpi/sbs.c

+22 −7
Original line number Diff line number Diff line
@@ -109,6 +109,7 @@ struct acpi_sbs { 
	u8 batteries_supported:4;

	u8 manager_present:1;

	u8 charger_present:1;

	u8 charger_exists:1;

};



#define to_acpi_sbs(x) container_of(x, struct acpi_sbs, charger)
@@ -429,9 +430,19 @@ static int acpi_ac_get_present(struct acpi_sbs *sbs) 


	result = acpi_smbus_read(sbs->hc, SMBUS_READ_WORD, ACPI_SBS_CHARGER,

				 0x13, (u8 *) & status);

	if (!result)

		sbs->charger_present = (status >> 15) & 0x1;



	if (result)

		return result;



	/*

	 * The spec requires that bit 4 always be 1. If it's not set, assume

	 * that the implementation doesn't support an SBS charger

	 */

	if (!(status >> 4) & 0x1)

		return -ENODEV;



	sbs->charger_present = (status >> 15) & 0x1;

	return 0;

}



static ssize_t acpi_battery_alarm_show(struct device *dev,
@@ -554,6 +565,7 @@ static int acpi_charger_add(struct acpi_sbs *sbs) 
	if (result)

		goto end;



	sbs->charger_exists = 1;

	sbs->charger.name = "sbs-charger";

	sbs->charger.type = POWER_SUPPLY_TYPE_MAINS;

	sbs->charger.properties = sbs_ac_props;
@@ -580,9 +592,12 @@ static void acpi_sbs_callback(void *context) 
	struct acpi_battery *bat;

	u8 saved_charger_state = sbs->charger_present;

	u8 saved_battery_state;



	if (sbs->charger_exists) {

		acpi_ac_get_present(sbs);

		if (sbs->charger_present != saved_charger_state)

			kobject_uevent(&sbs->charger.dev->kobj, KOBJ_CHANGE);

	}



	if (sbs->manager_present) {

		for (id = 0; id < MAX_SBS_BAT; ++id) {
@@ -619,7 +634,7 @@ static int acpi_sbs_add(struct acpi_device *device) 
	device->driver_data = sbs;



	result = acpi_charger_add(sbs);

	if (result)

	if (result && result != -ENODEV)

		goto end;



	result = acpi_manager_get_info(sbs);