ACPI: extend "acpi_osi=" boot option
The boot option "acpi_osi=" has always disabled Linux _OSI support,
thus disabling all OS Interface strings which are advertised
by Linux to the BIOS.
Now...
acpi_osi="string" adds the interface string, and
acpi_osi="!string" invalidates the pre-defined interface string
eg. acpi_osi="!Windows 2006"
would disable Linux's claim of Vista compatibility.
Signed-off-by: Len Brown <len.brown@intel.com>
diff --git a/drivers/acpi/osl.c b/drivers/acpi/osl.c
index b998340..f4760cf 100644
--- a/drivers/acpi/osl.c
+++ b/drivers/acpi/osl.c
@@ -73,6 +73,9 @@
static struct workqueue_struct *kacpid_wq;
static struct workqueue_struct *kacpi_notify_wq;
+#define OSI_STRING_LENGTH_MAX 64 /* arbitrary */
+static char osi_additional_string[OSI_STRING_LENGTH_MAX];
+
static void __init acpi_request_region (struct acpi_generic_address *addr,
unsigned int length, char *desc)
{
@@ -961,19 +964,23 @@
__setup("acpi_os_name=", acpi_os_name_setup);
/*
- * _OSI control
+ * Modify the list of "OS Interfaces" reported to BIOS via _OSI
+ *
* empty string disables _OSI
- * TBD additional string adds to _OSI
+ * string starting with '!' disables that string
+ * otherwise string is added to list, augmenting built-in strings
*/
static int __init acpi_osi_setup(char *str)
{
if (str == NULL || *str == '\0') {
printk(KERN_INFO PREFIX "_OSI method disabled\n");
acpi_gbl_create_osi_method = FALSE;
- } else {
- /* TBD */
- printk(KERN_ERR PREFIX "_OSI additional string ignored -- %s\n",
- str);
+ } else if (*str == '!') {
+ if (acpi_osi_invalidate(++str) == AE_OK)
+ printk(KERN_INFO PREFIX "Deleted _OSI(%s)\n", str);
+ } else if (*osi_additional_string == '\0') {
+ strncpy(osi_additional_string, str, OSI_STRING_LENGTH_MAX);
+ printk(KERN_INFO PREFIX "Added _OSI(%s)\n", str);
}
return 1;
@@ -1143,11 +1150,11 @@
acpi_status
acpi_os_validate_interface (char *interface)
{
-
- return AE_SUPPORT;
+ if (!strncmp(osi_additional_string, interface, OSI_STRING_LENGTH_MAX))
+ return AE_OK;
+ return AE_SUPPORT;
}
-
/******************************************************************************
*
* FUNCTION: acpi_os_validate_address