[PATCH v2 2/7] ACPI: Add an interface to evaluate _OST

Toshi Kani
2012-05-08T20:18:35Z

Added acpi_evaluate_hotplug_opt(). This function evaluates _OST for hotplug
operations. This function is stubbed out when CONFIG_ACPI_HOTPLUG_OST is
disabled.

Signed-off-by: Toshi Kani <toshi.kani@hp.com>
---
drivers/acpi/utils.c | 38 ++++++++++++++++++++++++++++++++++++++
include/acpi/acpi_bus.h | 3 +++
2 files changed, 41 insertions(+), 0 deletions(-)

diff --git a/drivers/acpi/utils.c b/drivers/acpi/utils.c
index b002a47..39d7349 100644
--- a/drivers/acpi/utils.c
+++ b/drivers/acpi/utils.c
@@ -382,3 +382,41 @@ acpi_evaluate_reference(acpi_handle handle,
}

EXPORT_SYMBOL(acpi_evaluate_reference);
+
+/*
+ * acpi_evaluate_hotplug_ost: Evaluate _OST for hotplug operations
+ * @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_hotplug_ost(acpi_handle handle, u32 source_event,
+ u32 status_code, struct acpi_buffer *status_buf)
+{
+#ifdef CONFIG_ACPI_HOTPLUG_OST
+ 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;
+#else
+ return AE_OK;
+#endif
+}
+EXPORT_SYMBOL(acpi_evaluate_hotplug_ost);
diff --git a/include/acpi/acpi_bus.h b/include/acpi/acpi_bus.h
index f1c8ca6..7309113 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_hotplug_ost(acpi_handle handle, u32 source_event,
+ u32 status_code, struct acpi_buffer *status_buf);

#ifdef CONFIG_ACPI

--
1.7.7.6