@@ -2116,6 +2116,23 @@ int dell_micmute_led_set(int state)
}
EXPORT_SYMBOL_GPL(dell_micmute_led_set);
+bool dell_switchable_gfx_is_enabled(void)
+{
+ struct calling_interface_buffer buffer;
+ struct calling_interface_token *token;
+
+ token = dell_smbios_find_token(SWITCHABLE_GRAPHICS_ENABLE);
+ if (!token)
+ return false;
+
+ dell_fill_request(&buffer, token->location, 0, 0, 0);
+ if (dell_send_request(&buffer, CLASS_TOKEN_READ, SELECT_TOKEN_STD))
+ return false;
+
+ return !!buffer.output[1];
+}
+EXPORT_SYMBOL_GPL(dell_switchable_gfx_is_enabled);
+
static int __init dell_init(void)
{
struct calling_interface_token *token;
@@ -86,6 +86,8 @@ struct token_range {
static struct token_range token_whitelist[] = {
/* used by userspace: fwupdate */
{CAP_SYS_ADMIN, CAPSULE_EN_TOKEN, CAPSULE_DIS_TOKEN},
+ /* can indicate to userspace Switchable Graphics enable status */
+ {CAP_SYS_ADMIN, SWITCHABLE_GRAPHICS_ENABLE, SWITCHABLE_GRAPHICS_DISABLE},
/* can indicate to userspace that WMI is needed */
{0x0000, WSMT_EN_TOKEN, WSMT_DIS_TOKEN}
};
@@ -37,6 +37,8 @@
#define KBD_LED_AUTO_100_TOKEN 0x02F6
#define GLOBAL_MIC_MUTE_ENABLE 0x0364
#define GLOBAL_MIC_MUTE_DISABLE 0x0365
+#define SWITCHABLE_GRAPHICS_ENABLE 0x037A
+#define SWITCHABLE_GRAPHICS_DISABLE 0x037B
struct notifier_block;
@@ -3,5 +3,6 @@
#define __DELL_COMMON_H__
int dell_micmute_led_set(int on);
+bool dell_switchable_gfx_is_enabled(void);
#endif
On some Dell platforms, there's a BIOS option "Enable Switchable Graphics". This information is useful if we want to do different things based on this value, e.g. disable unused audio controller that comes with the discrete graphics. Cc: Mario Limonciello <mario.limonciello@dell.com> Signed-off-by: Kai-Heng Feng <kai.heng.feng@canonical.com> --- v3: Simplify dell_switchable_gfx_is_enabled() by returning bool instead of error code. Use DMI_DEV_TYPE_OEM_STRING to match Dell System. v2: Mario suggested to squash the HDA part into the same series. drivers/platform/x86/dell-laptop.c | 17 +++++++++++++++++ drivers/platform/x86/dell-smbios-base.c | 2 ++ drivers/platform/x86/dell-smbios.h | 2 ++ include/linux/dell-common.h | 1 + 4 files changed, 22 insertions(+)