Pull video into release branch
[linux-2.6.git] / drivers / acpi / video.c
index d05891f16282338d96d5cf5a5f3f22d30d6cd5c0..f31e3c8749e0ae48f805489538346882eaf79ee8 100644 (file)
@@ -409,14 +409,17 @@ acpi_video_device_lcd_query_levels(struct acpi_video_device *device,
 static int
 acpi_video_device_lcd_set_level(struct acpi_video_device *device, int level)
 {
 static int
 acpi_video_device_lcd_set_level(struct acpi_video_device *device, int level)
 {
-       int status;
+       int status = AE_OK;
        union acpi_object arg0 = { ACPI_TYPE_INTEGER };
        struct acpi_object_list args = { 1, &arg0 };
 
 
        arg0.integer.value = level;
        union acpi_object arg0 = { ACPI_TYPE_INTEGER };
        struct acpi_object_list args = { 1, &arg0 };
 
 
        arg0.integer.value = level;
-       status = acpi_evaluate_object(device->dev->handle, "_BCM", &args, NULL);
 
 
+       if (device->cap._BCM)
+               status = acpi_evaluate_object(device->dev->handle, "_BCM",
+                                             &args, NULL);
+       device->brightness->curr = level;
        return status;
 }
 
        return status;
 }
 
@@ -424,11 +427,11 @@ static int
 acpi_video_device_lcd_get_level_current(struct acpi_video_device *device,
                                        unsigned long *level)
 {
 acpi_video_device_lcd_get_level_current(struct acpi_video_device *device,
                                        unsigned long *level)
 {
-       int status;
-
-       status = acpi_evaluate_integer(device->dev->handle, "_BQC", NULL, level);
-
-       return status;
+       if (device->cap._BQC)
+               return acpi_evaluate_integer(device->dev->handle, "_BQC", NULL,
+                                            level);
+       *level = device->brightness->curr;
+       return AE_OK;
 }
 
 static int
 }
 
 static int
@@ -1633,9 +1636,20 @@ static int
 acpi_video_get_next_level(struct acpi_video_device *device,
                          u32 level_current, u32 event)
 {
 acpi_video_get_next_level(struct acpi_video_device *device,
                          u32 level_current, u32 event)
 {
-       int min, max, min_above, max_below, i, l;
+       int min, max, min_above, max_below, i, l, delta = 255;
        max = max_below = 0;
        min = min_above = 255;
        max = max_below = 0;
        min = min_above = 255;
+       /* Find closest level to level_current */
+       for (i = 0; i < device->brightness->count; i++) {
+               l = device->brightness->levels[i];
+               if (abs(l - level_current) < abs(delta)) {
+                       delta = l - level_current;
+                       if (!delta)
+                               break;
+               }
+       }
+       /* Ajust level_current to closest available level */
+       level_current += delta;
        for (i = 0; i < device->brightness->count; i++) {
                l = device->brightness->levels[i];
                if (l < min)
        for (i = 0; i < device->brightness->count; i++) {
                l = device->brightness->levels[i];
                if (l < min)