Introduce several helper functions, which will be used to simplify code.
Signed-off-by: Jiang Liu <jiang.liu@xxxxxxxxxx>
---
drivers/acpi/utils.c | 74 +++++++++++++++++++++++++++++++++++++++++++++++++
include/acpi/acpi_bus.h | 5 ++++
2 files changed, 79 insertions(+)
diff --git a/drivers/acpi/utils.c b/drivers/acpi/utils.c
index 74437130..cb66fce 100644
--- a/drivers/acpi/utils.c
+++ b/drivers/acpi/utils.c
@@ -495,3 +495,77 @@ acpi_handle_printk(const char *level, acpi_handle handle, const char *fmt, ...)
kfree(buffer.pointer);
}
EXPORT_SYMBOL(acpi_handle_printk);
+
+/**
+ * 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;
+ union acpi_object arg;
+ struct acpi_object_list arg_list;
+
+ arg.type = ACPI_TYPE_INTEGER;
+ arg.integer.value = 1;
+ arg_list.count = 1;
+ arg_list.pointer = &arg;
+ status = acpi_evaluate_object(handle, "_EJ0", &arg_list, NULL);
+ 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;
+ union acpi_object arg;
+ struct acpi_object_list arg_list;
+
+ arg_list.count = 1;
+ arg_list.pointer = &arg;
+ arg.type = ACPI_TYPE_INTEGER;
+ arg.integer.value = !!lock;
+ status = acpi_evaluate_object(handle, "_LCK", &arg_list, NULL);
+ 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;
+}
+
+/**
+ * acpi_has_method: Check whether @handle has a method named @name
+ * @handle: ACPI device handle
+ * @name: name of object or method
+ *
+ * Check whether @handle has a method named @name.
+ */
+int acpi_has_method(acpi_handle handle, char *name)
+{
+ acpi_status status;
+ acpi_handle tmp;
+
+ status = acpi_get_handle(handle, name, &tmp);
+
+ return ACPI_FAILURE(status) ? 0 : 1;
+}
+EXPORT_SYMBOL(acpi_has_method);
diff --git a/include/acpi/acpi_bus.h b/include/acpi/acpi_bus.h
index 636c59f..5df5f89 100644
--- a/include/acpi/acpi_bus.h
+++ b/include/acpi/acpi_bus.h
@@ -56,6 +56,11 @@ acpi_evaluate_hotplug_ost(acpi_handle handle, u32 source_event,
acpi_status
acpi_get_physical_device_location(acpi_handle handle, struct acpi_pld_info **pld);
+
+acpi_status acpi_evaluate_ej0(acpi_handle handle);
+acpi_status acpi_evaluate_lck(acpi_handle handle, int lock);
+int acpi_has_method(acpi_handle handle, char *name);
+
#ifdef CONFIG_ACPI
#include <linux/proc_fs.h>
--
1.8.1.2
--
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