diff options
Diffstat (limited to 'drivers/acpi/sbs.c')
| -rw-r--r-- | drivers/acpi/sbs.c | 27 |
1 files changed, 18 insertions, 9 deletions
diff --git a/drivers/acpi/sbs.c b/drivers/acpi/sbs.c index e90752d4f488..94e3c000df2e 100644 --- a/drivers/acpi/sbs.c +++ b/drivers/acpi/sbs.c @@ -473,23 +473,32 @@ static const struct device_attribute alarm_attr = { -------------------------------------------------------------------------- */ static int acpi_battery_read(struct acpi_battery *battery) { - int result = 0, saved_present = battery->present; + int result, saved_present = battery->present; u16 state; if (battery->sbs->manager_present) { result = acpi_smbus_read(battery->sbs->hc, SMBUS_READ_WORD, ACPI_SBS_MANAGER, 0x01, (u8 *)&state); - if (!result) - battery->present = state & (1 << battery->id); - state &= 0x0fff; + if (result) + return result; + + battery->present = state & (1 << battery->id); + if (!battery->present) + return 0; + + /* Masking necessary for Smart Battery Selectors */ + state = 0x0fff; state |= 1 << (battery->id + 12); acpi_smbus_write(battery->sbs->hc, SMBUS_WRITE_WORD, ACPI_SBS_MANAGER, 0x01, (u8 *)&state, 2); - } else if (battery->id == 0) - battery->present = 1; - - if (result || !battery->present) - return result; + } else { + if (battery->id == 0) { + battery->present = 1; + } else { + if (!battery->present) + return 0; + } + } if (saved_present != battery->present) { battery->update_time = 0; |