asus-wmi: provide access to ALS control

Asus Zenbook ux31a is providing ACPI0008 interface for ALS
(Ambient Light Sensor), which is accessible for OS => Win 7.
This sensor can be used with iio/acpi-als driver.
Since it is disabled by default, we should use asus-wmi
interface to enable it.

Signed-off-by: Oleksij Rempel <linux@rempel-privat.de>
Signed-off-by: Darren Hart <dvhart@linux.intel.com>

diff --git a/drivers/platform/x86/asus-wmi.c b/drivers/platform/x86/asus-wmi.c
index a96630d..a26dca3 100644 (file)
--- a/drivers/platform/x86/asus-wmi.c
+++ b/drivers/platform/x86/asus-wmi.c
@@ -114,6 +114,7 @@ MODULE_LICENSE("GPL");
 #define ASUS_WMI_DEVID_LED6            0x00020016
 
 /* Backlight and Brightness */
+#define ASUS_WMI_DEVID_ALS_ENABLE      0x00050001 /* Ambient Light Sensor */
 #define ASUS_WMI_DEVID_BACKLIGHT       0x00050011
 #define ASUS_WMI_DEVID_BRIGHTNESS      0x00050012
 #define ASUS_WMI_DEVID_KBD_BACKLIGHT   0x00050021
@@ -1730,6 +1731,7 @@ ASUS_WMI_CREATE_DEVICE_ATTR(touchpad, 0644, ASUS_WMI_DEVID_TOUCHPAD);
 ASUS_WMI_CREATE_DEVICE_ATTR(camera, 0644, ASUS_WMI_DEVID_CAMERA);
 ASUS_WMI_CREATE_DEVICE_ATTR(cardr, 0644, ASUS_WMI_DEVID_CARDREADER);
 ASUS_WMI_CREATE_DEVICE_ATTR(lid_resume, 0644, ASUS_WMI_DEVID_LID_RESUME);
+ASUS_WMI_CREATE_DEVICE_ATTR(als_enable, 0644, ASUS_WMI_DEVID_ALS_ENABLE);
 
 static ssize_t store_cpufv(struct device *dev, struct device_attribute *attr,
                           const char *buf, size_t count)
@@ -1756,6 +1758,7 @@ static struct attribute *platform_attributes[] = {
        &dev_attr_cardr.attr,
        &dev_attr_touchpad.attr,
        &dev_attr_lid_resume.attr,
+       &dev_attr_als_enable.attr,
        NULL
 };
 
@@ -1776,6 +1779,8 @@ static umode_t asus_sysfs_is_visible(struct kobject *kobj,
                devid = ASUS_WMI_DEVID_TOUCHPAD;
        else if (attr == &dev_attr_lid_resume.attr)
                devid = ASUS_WMI_DEVID_LID_RESUME;
+       else if (attr == &dev_attr_als_enable.attr)
+               devid = ASUS_WMI_DEVID_ALS_ENABLE;
 
        if (devid != -1)
                ok = !(asus_wmi_get_devstate_simple(asus, devid) < 0);