asus-wmi: control backlight power through WMI, not ACPI

BugLink: https://bugs.launchpad.net/bugs/1000146

Some h/w that can adjust screen brightness through ACPI functions, but
can't turn on/off the backlight power correctly. So, we list those h/w in
quirks and try to turn on/off the backlight power through WMI.
Signed-off-by: AceLan Kao <acelan.kao@canonical.com>
Signed-off-by: Corentin Chary <corentin.chary@gmail.com>
Signed-off-by: Matthew Garrett <mjg@redhat.com>

3 files changed, 34 insertions, 1 deletions

diff --git a/drivers/platform/x86/asus-wmi.c b/drivers/platform/x86/asus-wmi.c
index 556cbb455ed2..486f836b79df 100644
--- a/drivers/platform/x86/asus-wmi.c
+++ b/drivers/platform/x86/asus-wmi.c
@@ -47,6 +47,9 @@
 #include <linux/thermal.h>
 #include <acpi/acpi_bus.h>
 #include <acpi/acpi_drivers.h>
+#ifdef CONFIG_ACPI_VIDEO
+#include <acpi/video.h>
+#endif
 
 #include "asus-wmi.h"
 
@@ -1676,7 +1679,13 @@ static int asus_wmi_add(struct platform_device *pdev)
         if (err)
                 goto fail_rfkill;
 
+        if (asus->driver->quirks->wmi_backlight_power)
+                acpi_video_dmi_promote_vendor();
         if (!acpi_video_backlight_support()) {
+#ifdef CONFIG_ACPI_VIDEO
+                pr_info("Disabling ACPI video driver\n");
+                acpi_video_unregister();
+#endif
                 err = asus_wmi_backlight_init(asus);
                 if (err && err != -ENODEV)
                         goto fail_backlight;
diff --git a/drivers/platform/x86/asus-wmi.h b/drivers/platform/x86/asus-wmi.h
index d43b66742004..9c1da8b81bea 100644
--- a/drivers/platform/x86/asus-wmi.h
+++ b/drivers/platform/x86/asus-wmi.h
@@ -39,6 +39,7 @@ struct quirk_entry {
         bool hotplug_wireless;
         bool scalar_panel_brightness;
         bool store_backlight_power;
+        bool wmi_backlight_power;
         int wapf;
 };
 
diff --git a/drivers/platform/x86/eeepc-wmi.c b/drivers/platform/x86/eeepc-wmi.c
index 656761380342..5838332ea5bd 100644
--- a/drivers/platform/x86/eeepc-wmi.c
+++ b/drivers/platform/x86/eeepc-wmi.c
@@ -79,7 +79,7 @@ static const struct key_entry eeepc_wmi_keymap[] = {
         { KE_KEY, 0xe1, { KEY_F14 } }, /* Change Resolution */
         { KE_KEY, HOME_PRESS, { KEY_CONFIG } }, /* Home/Express gate key */
         { KE_KEY, 0xe8, { KEY_SCREENLOCK } },
-        { KE_KEY, 0xe9, { KEY_BRIGHTNESS_ZERO } },
+        { KE_KEY, 0xe9, { KEY_DISPLAYTOGGLE } },
         { KE_KEY, 0xeb, { KEY_CAMERA_ZOOMOUT } },
         { KE_KEY, 0xec, { KEY_CAMERA_UP } },
         { KE_KEY, 0xed, { KEY_CAMERA_DOWN } },
@@ -107,6 +107,11 @@ static struct quirk_entry quirk_asus_et2012_type3 = {
         .store_backlight_power = true,
 };
 
+static struct quirk_entry quirk_asus_x101ch = {
+        /* We need this when ACPI function doesn't do this well */
+        .wmi_backlight_power = true,
+};
+
 static struct quirk_entry *quirks;
 
 static void et2012_quirks(void)
@@ -157,6 +162,24 @@ static struct dmi_system_id asus_quirks[] = {
                 },
                 .driver_data = &quirk_asus_unknown,
         },
+        {
+                .callback = dmi_matched,
+                .ident = "ASUSTeK Computer INC. X101CH",
+                .matches = {
+                        DMI_MATCH(DMI_SYS_VENDOR, "ASUSTeK COMPUTER INC."),
+                        DMI_MATCH(DMI_PRODUCT_NAME, "X101CH"),
+                },
+                .driver_data = &quirk_asus_x101ch,
+        },
+        {
+                .callback = dmi_matched,
+                .ident = "ASUSTeK Computer INC. 1015CX",
+                .matches = {
+                        DMI_MATCH(DMI_SYS_VENDOR, "ASUSTeK COMPUTER INC."),
+                        DMI_MATCH(DMI_PRODUCT_NAME, "1015CX"),
+                },
+                .driver_data = &quirk_asus_x101ch,
+        },
         {},
 };