platform/x86: dell-smbios: Introduce dispatcher for SMM calls

This splits up the dell-smbios driver into two drivers:
* dell-smbios
* dell-smbios-smm

dell-smbios can operate with multiple different dispatcher drivers to
perform SMBIOS operations.

Also modify the interface that dell-laptop and dell-wmi use align to this
model more closely.  Rather than a single global buffer being allocated
for all drivers, each driver will allocate and be responsible for it's own
buffer. The pointer will be passed to the calling function and each
dispatcher driver will then internally copy it to the proper location to
perform it's call.

Add defines for calls used by these methods in the dell-smbios.h header
for tracking purposes.

Signed-off-by: Mario Limonciello <mario.limonciello@dell.com>
Reviewed-by: Edward O'Callaghan <quasisec@google.com>
Signed-off-by: Darren Hart (VMware) <dvhart@infradead.org>

1 files changed, 41 insertions, 5 deletions

diff --git a/drivers/platform/x86/dell-smbios.h b/drivers/platform/x86/dell-smbios.h
index 742dd8bd66b9..b3179f5b326b 100644
--- a/drivers/platform/x86/dell-smbios.h
+++ b/drivers/platform/x86/dell-smbios.h
@@ -16,6 +16,35 @@
 #ifndef _DELL_SMBIOS_H_
 #define _DELL_SMBIOS_H_
 
+#include <linux/device.h>
+
+/* Classes and selects used in kernel drivers */
+#define CLASS_TOKEN_READ 0
+#define CLASS_TOKEN_WRITE 1
+#define SELECT_TOKEN_STD 0
+#define SELECT_TOKEN_BAT 1
+#define SELECT_TOKEN_AC 2
+#define CLASS_KBD_BACKLIGHT 4
+#define SELECT_KBD_BACKLIGHT 11
+#define CLASS_INFO 17
+#define SELECT_RFKILL 11
+#define SELECT_APP_REGISTRATION	3
+
+/* Tokens used in kernel drivers, any of these
+ * should be filtered from userspace access
+ */
+#define BRIGHTNESS_TOKEN	0x007d
+#define KBD_LED_AC_TOKEN	0x0451
+#define KBD_LED_OFF_TOKEN	0x01E1
+#define KBD_LED_ON_TOKEN	0x01E2
+#define KBD_LED_AUTO_TOKEN	0x01E3
+#define KBD_LED_AUTO_25_TOKEN	0x02EA
+#define KBD_LED_AUTO_50_TOKEN	0x02EB
+#define KBD_LED_AUTO_75_TOKEN	0x02EC
+#define KBD_LED_AUTO_100_TOKEN	0x02F6
+#define GLOBAL_MIC_MUTE_ENABLE	0x0364
+#define GLOBAL_MIC_MUTE_DISABLE	0x0365
+
 struct notifier_block;
 
 /* This structure will be modified by the firmware when we enter
@@ -37,12 +66,19 @@ struct calling_interface_token {
 	};
 };
 
-int dell_smbios_error(int value);
+struct calling_interface_structure {
+	struct dmi_header header;
+	u16 cmdIOAddress;
+	u8 cmdIOCode;
+	u32 supportedCmds;
+	struct calling_interface_token tokens[];
+} __packed;
 
-struct calling_interface_buffer *dell_smbios_get_buffer(void);
-void dell_smbios_clear_buffer(void);
-void dell_smbios_release_buffer(void);
-void dell_smbios_send_request(int class, int select);
+int dell_smbios_register_device(struct device *d, void *call_fn);
+void dell_smbios_unregister_device(struct device *d);
+
+int dell_smbios_error(int value);
+int dell_smbios_call(struct calling_interface_buffer *buffer);
 
 struct calling_interface_token *dell_smbios_find_token(int tokenid);