The acpi_video driver needs to know the latest Windows version requested
by the BIOS to work around a buggy backlight implementation which is
specific to Windows 8. Add a new interface named
acpi_osi_windows_version() for retrieving this information.
Signed-off-by: Seth Forshee <seth.forshee@xxxxxxxxxxxxx>
---
drivers/acpi/acpica/aclocal.h | 13 -------------
drivers/acpi/acpica/utxface.c | 19 +++++++++++++++++++
include/acpi/acpixf.h | 18 ++++++++++++++++++
3 files changed, 37 insertions(+), 13 deletions(-)
diff --git a/drivers/acpi/acpica/aclocal.h b/drivers/acpi/acpica/aclocal.h
index ff8bd00..932c3d8 100644
--- a/drivers/acpi/acpica/aclocal.h
+++ b/drivers/acpi/acpica/aclocal.h
@@ -926,19 +926,6 @@ struct acpi_bit_register_info {
/* Structs and definitions for _OSI support and I/O port validation */
-#define ACPI_OSI_WIN_2000 0x01
-#define ACPI_OSI_WIN_XP 0x02
-#define ACPI_OSI_WIN_XP_SP1 0x03
-#define ACPI_OSI_WINSRV_2003 0x04
-#define ACPI_OSI_WIN_XP_SP2 0x05
-#define ACPI_OSI_WINSRV_2003_SP1 0x06
-#define ACPI_OSI_WIN_VISTA 0x07
-#define ACPI_OSI_WINSRV_2008 0x08
-#define ACPI_OSI_WIN_VISTA_SP1 0x09
-#define ACPI_OSI_WIN_VISTA_SP2 0x0A
-#define ACPI_OSI_WIN_7 0x0B
-#define ACPI_OSI_WIN_8 0x0C
-
#define ACPI_ALWAYS_ILLEGAL 0x00
struct acpi_interface_info {
diff --git a/drivers/acpi/acpica/utxface.c b/drivers/acpi/acpica/utxface.c
index 390db0c..1531984 100644
--- a/drivers/acpi/acpica/utxface.c
+++ b/drivers/acpi/acpica/utxface.c
@@ -384,6 +384,25 @@ ACPI_EXPORT_SYMBOL(acpi_install_interface_handler)
/*****************************************************************************
*
+ * FUNCTION: acpi_osi_windows_version
+ *
+ * PARAMETERS: None
+ *
+ * RETURN: Latest Windows version Windows requested via _OSI
+ *
+ * DESCRIPTION: Returns the latest version of Windows that has been requested
+ * by the BIOS via _OSI.
+ *
+ ****************************************************************************/
+u8 acpi_osi_windows_version(void)
+{
+ return acpi_gbl_osi_data;
+}
+
+ACPI_EXPORT_SYMBOL(acpi_osi_windows_version)
+
+/*****************************************************************************
+ *
* FUNCTION: acpi_check_address_range
*
* PARAMETERS: space_id - Address space ID
diff --git a/include/acpi/acpixf.h b/include/acpi/acpixf.h
index 3d88395..29a9429 100644
--- a/include/acpi/acpixf.h
+++ b/include/acpi/acpixf.h
@@ -73,6 +73,22 @@ extern u8 acpi_gbl_truncate_io_addresses;
extern u8 acpi_gbl_disable_auto_repair;
/*
+ * Values returned by acpi_osi_windows_version()
+ */
+#define ACPI_OSI_WIN_2000 0x01
+#define ACPI_OSI_WIN_XP 0x02
+#define ACPI_OSI_WIN_XP_SP1 0x03
+#define ACPI_OSI_WINSRV_2003 0x04
+#define ACPI_OSI_WIN_XP_SP2 0x05
+#define ACPI_OSI_WINSRV_2003_SP1 0x06
+#define ACPI_OSI_WIN_VISTA 0x07
+#define ACPI_OSI_WINSRV_2008 0x08
+#define ACPI_OSI_WIN_VISTA_SP1 0x09
+#define ACPI_OSI_WIN_VISTA_SP2 0x0A
+#define ACPI_OSI_WIN_7 0x0B
+#define ACPI_OSI_WIN_8 0x0C
+
+/*
* Hardware-reduced prototypes. All interfaces that use these macros will
* be configured out of the ACPICA build if the ACPI_REDUCED_HARDWARE flag
* is set to TRUE.
@@ -301,6 +317,8 @@ acpi_status acpi_install_notify_handler(acpi_handle device, u32 handler_type,
acpi_notify_handler handler,
void *context);
+u8 acpi_osi_windows_version(void);
+
acpi_status
acpi_remove_notify_handler(acpi_handle device,
u32 handler_type, acpi_notify_handler handler);
--
1.7.9.5
--
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