[PATCH v8 1/3] platform/x86: dell-smbios: Add helper for checking supported class

[Lyndon Sanche]

Add helper that returns true if smbios command class is supported.

Signed-off-by: Lyndon Sanche <lsanche@xxxxxxxxxx>
---
 drivers/platform/x86/dell/dell-smbios-base.c | 9 +++++++++
 drivers/platform/x86/dell/dell-smbios.h      | 1 +
 2 files changed, 10 insertions(+)

diff --git a/drivers/platform/x86/dell/dell-smbios-base.c b/drivers/platform/x86/dell/dell-smbios-base.c
index e61bfaf8b5c4..fbdd12a7cb8d 100644
--- a/drivers/platform/x86/dell/dell-smbios-base.c
+++ b/drivers/platform/x86/dell/dell-smbios-base.c
@@ -350,6 +350,15 @@ void dell_laptop_call_notifier(unsigned long action, void *data)
 }
 EXPORT_SYMBOL_GPL(dell_laptop_call_notifier);
 
+bool dell_smbios_class_is_supported(u16 class)
+{
+	/* Classes over 30 always unsupported */
+	if (class > 30)
+		return false;
+	return da_supported_commands & (1 << class);
+}
+EXPORT_SYMBOL_GPL(dell_smbios_class_is_supported);
+
 static void __init parse_da_table(const struct dmi_header *dm)
 {
 	/* Final token is a terminator, so we don't want to copy it */
diff --git a/drivers/platform/x86/dell/dell-smbios.h b/drivers/platform/x86/dell/dell-smbios.h
index eb341bf000c6..756c354b1eef 100644
--- a/drivers/platform/x86/dell/dell-smbios.h
+++ b/drivers/platform/x86/dell/dell-smbios.h
@@ -73,6 +73,7 @@ enum dell_laptop_notifier_actions {
 int dell_laptop_register_notifier(struct notifier_block *nb);
 int dell_laptop_unregister_notifier(struct notifier_block *nb);
 void dell_laptop_call_notifier(unsigned long action, void *data);
+bool dell_smbios_class_is_supported(u16 class);
 
 /* for the supported backends */
 #ifdef CONFIG_DELL_SMBIOS_WMI
-- 
2.42.0