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: Matthew Garrett <matthew.garrett@nebula.com>
Signed-off-by: Andreas Noever <andreas.noever@gmail.com>
Signed-off-by: Rafael J. Wysocki <rafael.j.wysocki@intel.com>

diff --git a/drivers/acpi/sbs.c b/drivers/acpi/sbs.c
index 366ca40a6f703433efc1016a658eaac9e28c5c48..b1df4eee8657b6d6f0b3c27331e0bfa6901350f0 100644 (file)
--- a/drivers/acpi/sbs.c
+++ b/drivers/acpi/sbs.c
@@ -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;
-       return result;
+
+       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;
-       acpi_ac_get_present(sbs);
-       if (sbs->charger_present != saved_charger_state)
-               kobject_uevent(&sbs->charger.dev->kobj, KOBJ_CHANGE);
+
+       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);