[PATCH 6/7] asus-wmi: control backlight power through WMI, not ACPI

From: Corentin Chary
Date: Wed Jun 13 2012 - 03:32:44 EST


From: AceLan Kao <acelan.kao@xxxxxxxxxxxxx>

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@xxxxxxxxxxxxx>
Signed-off-by: Corentin Chary <corentin.chary@xxxxxxxxx>
---
drivers/platform/x86/asus-wmi.c | 9 +++++++++
drivers/platform/x86/asus-wmi.h | 1 +
drivers/platform/x86/eeepc-wmi.c | 25 ++++++++++++++++++++++++-
3 files changed, 34 insertions(+), 1 deletion(-)

diff --git a/drivers/platform/x86/asus-wmi.c b/drivers/platform/x86/asus-wmi.c
index 77aadde..4beded3 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"

@@ -1681,7 +1684,13 @@ 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 d43b667..9c1da8b 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 6567613..5838332 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,
+ },
{},
};

--
1.7.9.5

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