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authorMatthew Garrett <matthew.garrett@nebula.com>2014-09-20 13:19:45 +0200
committerRafael J. Wysocki <rafael.j.wysocki@intel.com>2014-09-24 23:31:11 +0200
commit3031cddea633ea5328162d3d712a582e4205dbed (patch)
treefdd49651c754cd6fd2f2c7d9810720eb21a6c230 /drivers/acpi/sbs.c
parent0f33be009b89d2268e94194dc4fd01a7851b6d51 (diff)
downloadop-kernel-dev-3031cddea633ea5328162d3d712a582e4205dbed.zip
op-kernel-dev-3031cddea633ea5328162d3d712a582e4205dbed.tar.gz
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>
Diffstat (limited to 'drivers/acpi/sbs.c')
-rw-r--r--drivers/acpi/sbs.c29
1 files changed, 22 insertions, 7 deletions
diff --git a/drivers/acpi/sbs.c b/drivers/acpi/sbs.c
index 366ca40..b1df4ee 100644
--- 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);
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