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authorLen Brown <len.brown@intel.com>2009-09-19 09:56:17 +0400
committerLen Brown <len.brown@intel.com>2009-09-19 09:56:17 +0400
commit7a92d803227a523a9a5546e4e0dce1325a4b5926 (patch)
treefd914dcba7a367939550774d786355352628c3b3 /drivers/acpi/battery.c
parentb4549a24b6194201077d0295207ec204f785fab1 (diff)
parentbc76f90b8a5cf4aceedf210d08d5e8292f820cec (diff)
downloadlinux-7a92d803227a523a9a5546e4e0dce1325a4b5926.tar.xz
Merge branch 'battery' into release
Diffstat (limited to 'drivers/acpi/battery.c')
-rw-r--r--drivers/acpi/battery.c20
1 files changed, 20 insertions, 0 deletions
diff --git a/drivers/acpi/battery.c b/drivers/acpi/battery.c
index f8c3d1bb6969..3f4602b8f287 100644
--- a/drivers/acpi/battery.c
+++ b/drivers/acpi/battery.c
@@ -31,6 +31,7 @@
#include <linux/types.h>
#include <linux/jiffies.h>
#include <linux/async.h>
+#include <linux/dmi.h>
#ifdef CONFIG_ACPI_PROCFS_POWER
#include <linux/proc_fs.h>
@@ -87,6 +88,10 @@ static const struct acpi_device_id battery_device_ids[] = {
MODULE_DEVICE_TABLE(acpi, battery_device_ids);
+/* For buggy DSDTs that report negative 16-bit values for either charging
+ * or discharging current and/or report 0 as 65536 due to bad math.
+ */
+#define QUIRK_SIGNED16_CURRENT 0x0001
struct acpi_battery {
struct mutex lock;
@@ -114,6 +119,7 @@ struct acpi_battery {
int state;
int power_unit;
u8 alarm_present;
+ long quirks;
};
#define to_acpi_battery(x) container_of(x, struct acpi_battery, bat);
@@ -392,6 +398,11 @@ static int acpi_battery_get_state(struct acpi_battery *battery)
state_offsets, ARRAY_SIZE(state_offsets));
battery->update_time = jiffies;
kfree(buffer.pointer);
+
+ if ((battery->quirks & QUIRK_SIGNED16_CURRENT) &&
+ battery->rate_now != -1)
+ battery->rate_now = abs((s16)battery->rate_now);
+
return result;
}
@@ -497,6 +508,14 @@ static void sysfs_remove_battery(struct acpi_battery *battery)
}
#endif
+static void acpi_battery_quirks(struct acpi_battery *battery)
+{
+ battery->quirks = 0;
+ if (dmi_name_in_vendors("Acer") && battery->power_unit) {
+ battery->quirks |= QUIRK_SIGNED16_CURRENT;
+ }
+}
+
static int acpi_battery_update(struct acpi_battery *battery)
{
int result, old_present = acpi_battery_present(battery);
@@ -515,6 +534,7 @@ static int acpi_battery_update(struct acpi_battery *battery)
result = acpi_battery_get_info(battery);
if (result)
return result;
+ acpi_battery_quirks(battery);
acpi_battery_init_alarm(battery);
}
#ifdef CONFIG_ACPI_SYSFS_POWER