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Subject[PATCH 2/4] ACPI: Add acpi_evaluate_ost() for calling _OST
Date
Added a new function, acpi_evaluate_ost(), to utils.c.  This
function can be called from ACPI-based drivers / modules to
invoke ACPI _OST method.

Signed-off-by: Toshi Kani <toshi.kani@hp.com>
---
drivers/acpi/utils.c | 34 ++++++++++++++++++++++++++++++++++
include/acpi/acpi_bus.h | 3 +++
2 files changed, 37 insertions(+), 0 deletions(-)
diff --git a/drivers/acpi/utils.c b/drivers/acpi/utils.c
index b002a47..09b48c3 100644
--- a/drivers/acpi/utils.c
+++ b/drivers/acpi/utils.c
@@ -382,3 +382,37 @@ acpi_evaluate_reference(acpi_handle handle,
}

EXPORT_SYMBOL(acpi_evaluate_reference);
+
+/*
+ * acpi_evaluate_ost: Evaluate ACPI OSPM Status Indication method
+ * @handle: ACPI device handle
+ * @source_event: source event code
+ * @status_code: status code
+ * @status_buf: optional detailed information (NULL if none)
+ */
+acpi_status
+acpi_evaluate_ost(acpi_handle handle, u32 source_event, u32 status_code,
+ struct acpi_buffer *status_buf)
+{
+ union acpi_object params[3] = {
+ {.type = ACPI_TYPE_INTEGER,},
+ {.type = ACPI_TYPE_INTEGER,},
+ {.type = ACPI_TYPE_BUFFER,}
+ };
+ struct acpi_object_list arg_list = {3, params};
+ acpi_status status;
+
+ params[0].integer.value = source_event;
+ params[1].integer.value = status_code;
+ if (status_buf != NULL) {
+ params[2].buffer.pointer = status_buf->pointer;
+ params[2].buffer.length = status_buf->length;
+ } else {
+ params[2].buffer.pointer = NULL;
+ params[2].buffer.length = 0;
+ }
+
+ status = acpi_evaluate_object(handle, "_OST", &arg_list, NULL);
+ return status;
+}
+EXPORT_SYMBOL(acpi_evaluate_ost);
diff --git a/include/acpi/acpi_bus.h b/include/acpi/acpi_bus.h
index f1c8ca6..0dac8cb 100644
--- a/include/acpi/acpi_bus.h
+++ b/include/acpi/acpi_bus.h
@@ -50,6 +50,9 @@ acpi_evaluate_reference(acpi_handle handle,
acpi_string pathname,
struct acpi_object_list *arguments,
struct acpi_handle_list *list);
+acpi_status
+acpi_evaluate_ost(acpi_handle handle, u32 source_event, u32 status_code,
+ struct acpi_buffer *status_buf);

#ifdef CONFIG_ACPI

--
1.7.7.6


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