asus-laptop: add light sensor support

/proc/acpi/asus/lslvl is now /sys/.../asus-laptop/ls_level
/proc/acpi/asus/lssw is now /sys/.../asus-laptop/ls_switch nothing
else ..

Signed-off-by: Corentin Chary <corentincj@iksaif.net>
Signed-off-by: Len Brown <len.brown@intel.com>

1 files changed, 84 insertions, 0 deletions

diff --git a/drivers/misc/asus-laptop.c b/drivers/misc/asus-laptop.c
index bd963c6365c8..6f72cd529556 100644
--- a/drivers/misc/asus-laptop.c
+++ b/drivers/misc/asus-laptop.c
@@ -145,6 +145,9 @@ ASUS_HANDLE(display_get,
             "\\INFB", /* A2H D1 L2D L3D L3H L2E L5D L5C M1A M2E L4L W3V */
             "\\SSTE"); /* A3F A6F A3N A3L M6N W3N W6A */
 
+ASUS_HANDLE(ls_switch, ASUS_HOTK_PREFIX "ALSC"); /* Z71A Z71V */
+ASUS_HANDLE(ls_level, ASUS_HOTK_PREFIX "ALSL"); /* Z71A Z71V */
+
 /*
  * This is the main structure, we can use it to store anything interesting
  * about the hotk device
@@ -155,6 +158,8 @@ struct asus_hotk {
         acpi_handle handle;     //the handle of the hotk device
         char status;            //status of the hotk, for LEDs, ...
         u32 ledd_status;        //status of the LED display
+        u8 light_level;    //light sensor level
+        u8 light_switch;    //light sensor switch value
         u16 event_count[128];   //count for each event TODO make this better
 };
 
@@ -590,6 +595,62 @@ static ssize_t store_disp(struct device *dev, struct device_attribute *attr,
         return rv;
 }
 
+/*
+ * Light Sens
+ */
+static void set_light_sens_switch(int value)
+{
+        if (!write_acpi_int(ls_switch_handle, NULL, value, NULL))
+                printk(ASUS_WARNING "Error setting light sensor switch\n");
+        hotk->light_switch = value;
+}
+
+static ssize_t show_lssw(struct device *dev,
+                         struct device_attribute *attr, char *buf)
+{
+        return sprintf(buf, "%d\n", hotk->light_switch);
+}
+
+static ssize_t store_lssw(struct device *dev, struct device_attribute *attr,
+                          const char *buf, size_t count)
+{
+        int rv, value;
+
+        rv = parse_arg(buf, count, &value);
+        if (rv > 0)
+                set_light_sens_switch(value ? 1 : 0);
+
+        return rv;
+}
+
+static void set_light_sens_level(int value)
+{
+        if (!write_acpi_int(ls_level_handle, NULL, value, NULL))
+                printk(ASUS_WARNING "Error setting light sensor level\n");
+        hotk->light_level = value;
+}
+
+static ssize_t show_lslvl(struct device *dev,
+                          struct device_attribute *attr, char *buf)
+{
+        return sprintf(buf, "%d\n", hotk->light_level);
+}
+
+static ssize_t store_lslvl(struct device *dev, struct device_attribute *attr,
+                           const char *buf, size_t count)
+{
+        int rv, value;
+
+        rv = parse_arg(buf, count, &value);
+        if (rv > 0) {
+                value = (0 < value) ? ((15 < value) ? 15 : value) : 0;
+                /* 0 <= value <= 15 */
+                set_light_sens_level(value);
+        }
+
+        return rv;
+}
+
 static void asus_hotk_notify(acpi_handle handle, u32 event, void *data)
 {
         /* TODO Find a better way to handle events count. */
@@ -636,6 +697,8 @@ static ASUS_CREATE_DEVICE_ATTR(wlan);
 static ASUS_CREATE_DEVICE_ATTR(bluetooth);
 static ASUS_CREATE_DEVICE_ATTR(display);
 static ASUS_CREATE_DEVICE_ATTR(ledd);
+static ASUS_CREATE_DEVICE_ATTR(ls_switch);
+static ASUS_CREATE_DEVICE_ATTR(ls_level);
 
 static struct attribute *asuspf_attributes[] = {
         &dev_attr_infos.attr,
@@ -643,6 +706,8 @@ static struct attribute *asuspf_attributes[] = {
         &dev_attr_bluetooth.attr,
         &dev_attr_display.attr,
         &dev_attr_ledd.attr,
+        &dev_attr_ls_switch.attr,
+        &dev_attr_ls_level.attr,
         NULL
 };
 
@@ -679,6 +744,10 @@ static void asus_hotk_add_fs(void)
         if (ledd_set_handle)
                 ASUS_SET_DEVICE_ATTR(ledd, 0644, show_ledd, store_ledd);
 
+        if (ls_switch_handle && ls_level_handle) {
+                ASUS_SET_DEVICE_ATTR(ls_level, 0644, show_lslvl, store_lslvl);
+                ASUS_SET_DEVICE_ATTR(ls_switch, 0644, show_lssw, store_lssw);
+        }
 }
 
 static int asus_handle_init(char *name, acpi_handle *handle,
@@ -800,6 +869,11 @@ static int asus_hotk_get_info(void)
         ASUS_HANDLE_INIT(display_set);
         ASUS_HANDLE_INIT(display_get);
 
+        /* There is a lot of models with "ALSL", but a few get
+           a real light sens, so we need to check it. */
+        if(ASUS_HANDLE_INIT(ls_switch))
+                ASUS_HANDLE_INIT(ls_level);
+
         kfree(model);
 
         return AE_OK;
@@ -874,6 +948,16 @@ static int asus_hotk_add(struct acpi_device *device)
         /* LED display is off by default */
         hotk->ledd_status = 0xFFF;
 
+        /* Set initial values of light sensor and level */
+        hotk->light_switch = 1; /* Default to light sensor disabled */
+        hotk->light_level = 0; /* level 5 for sensor sensitivity */
+
+        if (ls_switch_handle)
+                set_light_sens_switch(hotk->light_switch);
+
+        if (ls_level_handle)
+                set_light_sens_level(hotk->light_level);
+
       end:
         if (result) {
                 kfree(hotk->name);