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    Subject[PATCH 30/85] dock: add _LCK support
    From: Shaohua Li <shaohua.li@intel.com>

    support _LCK method, which is a optional method for hotplug

    lenb: we have not seen _LCK used in the field yet

    Signed-off-by: Shaohua Li <shaohua.li@intel.com>
    Signed-off-by: Len Brown <len.brown@intel.com>
    ---
    drivers/acpi/dock.c | 21 +++++++++++++++++++++
    1 files changed, 21 insertions(+), 0 deletions(-)

    diff --git a/drivers/acpi/dock.c b/drivers/acpi/dock.c
    index 78d27ce..7bdf93b 100644
    --- a/drivers/acpi/dock.c
    +++ b/drivers/acpi/dock.c
    @@ -452,6 +452,25 @@ static inline void complete_undock(struct dock_station *ds)
    ds->flags &= ~(DOCK_UNDOCKING);
    }

    +static void dock_lock(struct dock_station *ds, int lock)
    +{
    + struct acpi_object_list arg_list;
    + union acpi_object arg;
    + acpi_status status;
    +
    + arg_list.count = 1;
    + arg_list.pointer = &arg;
    + arg.type = ACPI_TYPE_INTEGER;
    + arg.integer.value = !!lock;
    + status = acpi_evaluate_object(ds->handle, "_LCK", &arg_list, NULL);
    + if (ACPI_FAILURE(status) && status != AE_NOT_FOUND) {
    + if (lock)
    + printk(KERN_WARNING PREFIX "Locking device failed\n");
    + else
    + printk(KERN_WARNING PREFIX "Unlocking device failed\n");
    + }
    +}
    +
    /**
    * dock_in_progress - see if we are in the middle of handling a dock event
    * @ds: the dock station
    @@ -577,6 +596,7 @@ static int handle_eject_request(struct dock_station *ds, u32 event)

    hotplug_dock_devices(ds, ACPI_NOTIFY_EJECT_REQUEST);
    undock(ds);
    + dock_lock(ds, 0);
    eject_dock(ds);
    if (dock_present(ds)) {
    printk(KERN_ERR PREFIX "Unable to undock!\n");
    @@ -617,6 +637,7 @@ static void dock_notify(acpi_handle handle, u32 event, void *data)
    hotplug_dock_devices(ds, event);
    complete_dock(ds);
    dock_event(ds, event, DOCK_EVENT);
    + dock_lock(ds, 1);
    }
    break;
    case ACPI_NOTIFY_DEVICE_CHECK:
    --
    1.5.5.1


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