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authorJiang Liu <jiang.liu@huawei.com>2013-06-29 00:24:40 +0800
committerRafael J. Wysocki <rafael.j.wysocki@intel.com>2013-07-15 01:33:10 +0200
commit7d2421f84b445dc48c68d33911f1fd6ce6853ee3 (patch)
tree8526f0747a4fcfff28176e5e8c890a9bf0246a28 /drivers/acpi/utils.c
parent0db98202605c3d32e023d43c30b5bd878f520976 (diff)
ACPI: introduce two helper functions for _EJ0 and _LCK
Introduce two helper functions, acpi_evaluate_ej0() and acpi_evaluate_lck(), that will execute the _EJ0 and _LCK ACPI control methods, respectively, and use them to simplify the ACPI scan code. [rjw: Changelog] Signed-off-by: Jiang Liu <jiang.liu@huawei.com> Signed-off-by: Rafael J. Wysocki <rafael.j.wysocki@intel.com>
Diffstat (limited to 'drivers/acpi/utils.c')
-rw-r--r--drivers/acpi/utils.c43
1 files changed, 43 insertions, 0 deletions
diff --git a/drivers/acpi/utils.c b/drivers/acpi/utils.c
index 87b85882b5df..552248b0005b 100644
--- a/drivers/acpi/utils.c
+++ b/drivers/acpi/utils.c
@@ -522,3 +522,46 @@ acpi_status acpi_execute_simple_method(acpi_handle handle, char *method,
return acpi_evaluate_object(handle, method, &arg_list, NULL);
}
EXPORT_SYMBOL(acpi_execute_simple_method);
+
+/**
+ * acpi_evaluate_ej0: Evaluate _EJ0 method for hotplug operations
+ * @handle: ACPI device handle
+ *
+ * Evaluate device's _EJ0 method for hotplug operations.
+ */
+acpi_status acpi_evaluate_ej0(acpi_handle handle)
+{
+ acpi_status status;
+
+ status = acpi_execute_simple_method(handle, "_EJ0", 1);
+ if (status == AE_NOT_FOUND)
+ acpi_handle_warn(handle, "No _EJ0 support for device\n");
+ else if (ACPI_FAILURE(status))
+ acpi_handle_warn(handle, "Eject failed (0x%x)\n", status);
+
+ return status;
+}
+
+/**
+ * acpi_evaluate_lck: Evaluate _LCK method to lock/unlock device
+ * @handle: ACPI device handle
+ * @lock: lock device if non-zero, otherwise unlock device
+ *
+ * Evaluate device's _LCK method if present to lock/unlock device
+ */
+acpi_status acpi_evaluate_lck(acpi_handle handle, int lock)
+{
+ acpi_status status;
+
+ status = acpi_execute_simple_method(handle, "_LCK", !!lock);
+ if (ACPI_FAILURE(status) && status != AE_NOT_FOUND) {
+ if (lock)
+ acpi_handle_warn(handle,
+ "Locking device failed (0x%x)\n", status);
+ else
+ acpi_handle_warn(handle,
+ "Unlocking device failed (0x%x)\n", status);
+ }
+
+ return status;
+}