linux-kernel - [PATCH v7 1/3] platform/x86: dell-smbios: Add helper for checking supported class

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Message-ID: <20240517224323.10045-2-lsanche@lyndeno.ca>
Date: Fri, 17 May 2024 16:42:34 -0600
From: Lyndon Sanche <lsanche@...deno.ca>
To: lsanche@...deno.ca
Cc: mario.limonciello@....com,
	pali@...nel.org,
	W_Armin@....de,
	srinivas.pandruvada@...ux.intel.com,
	ilpo.jarvinen@...ux.intel.com,
	lkp@...el.com,
	hdegoede@...hat.com,
	Yijun.Shen@...l.com,
	Matthew Garrett <mjg59@...f.ucam.org>,
	Jonathan Corbet <corbet@....net>,
	Heiner Kallweit <hkallweit1@...il.com>,
	Vegard Nossum <vegard.nossum@...cle.com>,
	linux-kernel@...r.kernel.org,
	platform-driver-x86@...r.kernel.org,
	Dell.Client.Kernel@...l.com
Subject: [PATCH v7 1/3] platform/x86: dell-smbios: Add helper for checking supported class

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

Signed-off-by: Lyndon Sanche <lsanche@...deno.ca>
---
 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