alienware-wmi: make hdmi_mux enabled on case-by-case basis

Not all HW supporting WMAX method will support the HDMI mux feature.
Explicitly quirk the HW that does support it.

Signed-off-by: Mario Limonciello <mario_limonciello@dell.com>
Signed-off-by: Matthew Garrett <matthew.garrett@nebula.com>

1 files changed, 20 insertions, 2 deletions

diff --git a/drivers/platform/x86/alienware-wmi.c b/drivers/platform/x86/alienware-wmi.c
index cdbaf3c5328a..c5af23b64438 100644
--- a/drivers/platform/x86/alienware-wmi.c
+++ b/drivers/platform/x86/alienware-wmi.c
@@ -59,16 +59,24 @@ enum WMAX_CONTROL_STATES {
 
 struct quirk_entry {
         u8 num_zones;
+        u8 hdmi_mux;
 };
 
 static struct quirk_entry *quirks;
 
 static struct quirk_entry quirk_unknown = {
         .num_zones = 2,
+        .hdmi_mux = 0,
 };
 
 static struct quirk_entry quirk_x51_family = {
         .num_zones = 3,
+        .hdmi_mux = 0.
+};
+
+static struct quirk_entry quirk_asm100 = {
+        .num_zones = 2,
+        .hdmi_mux = 1,
 };
 
 static int __init dmi_matched(const struct dmi_system_id *dmi)
@@ -96,6 +104,15 @@ static const struct dmi_system_id alienware_quirks[] __initconst = {
                      },
          .driver_data = &quirk_x51_family,
          },
+        {
+                .callback = dmi_matched,
+                .ident = "Alienware ASM100",
+                .matches = {
+                        DMI_MATCH(DMI_SYS_VENDOR, "Alienware"),
+                        DMI_MATCH(DMI_PRODUCT_NAME, "ASM100"),
+                },
+                .driver_data = &quirk_asm100,
+        },
         {}
 };
 
@@ -537,7 +554,8 @@ static struct attribute_group hdmi_attribute_group = {
 
 static void remove_hdmi(struct platform_device *dev)
 {
-        sysfs_remove_group(&dev->dev.kobj, &hdmi_attribute_group);
+        if (quirks->hdmi_mux > 0)
+                sysfs_remove_group(&dev->dev.kobj, &hdmi_attribute_group);
 }
 
 static int create_hdmi(struct platform_device *dev)
@@ -583,7 +601,7 @@ static int __init alienware_wmi_init(void)
         if (ret)
                 goto fail_platform_device2;
 
-        if (interface == WMAX) {
+        if (quirks->hdmi_mux > 0) {
                 ret = create_hdmi(platform_device);
                 if (ret)
                         goto fail_prep_hdmi;