4 files changed, 93 insertions, 39 deletions

diff --git a/drivers/acpi/Kconfig b/drivers/acpi/Kconfig
index 501ed6ffa40f..408b45168aba 100644
--- a/drivers/acpi/Kconfig
+++ b/drivers/acpi/Kconfig
@@ -118,7 +118,7 @@ config ACPI_BUTTON
 
 config ACPI_VIDEO
         tristate "Video"
-        depends on X86 && BACKLIGHT_CLASS_DEVICE
+        depends on X86 && BACKLIGHT_CLASS_DEVICE && VIDEO_OUTPUT_CONTROL
         help
           This driver implement the ACPI Extensions For Display Adapters
           for integrated graphics devices on motherboard, as specified in
diff --git a/drivers/acpi/video.c b/drivers/acpi/video.c
index 00d25b347255..5f014d3764c8 100644
--- a/drivers/acpi/video.c
+++ b/drivers/acpi/video.c
@@ -33,6 +33,7 @@
 #include <linux/seq_file.h>
 
 #include <linux/backlight.h>
+#include <linux/video_output.h>
 #include <asm/uaccess.h>
 
 #include <acpi/acpi_bus.h>
@@ -169,6 +170,7 @@ struct acpi_video_device {
         struct acpi_device *dev;
         struct acpi_video_device_brightness *brightness;
         struct backlight_device *backlight;
+        struct output_device *output_dev;
 };
 
 /* bus */
@@ -272,6 +274,10 @@ static int acpi_video_get_next_level(struct acpi_video_device *device,
                                      u32 level_current, u32 event);
 static void acpi_video_switch_brightness(struct acpi_video_device *device,
                                          int event);
+static int acpi_video_device_get_state(struct acpi_video_device *device,
+                            unsigned long *state);
+static int acpi_video_output_get(struct output_device *od);
+static int acpi_video_device_set_state(struct acpi_video_device *device, int state);
 
 /*backlight device sysfs support*/
 static int acpi_video_get_brightness(struct backlight_device *bd)
@@ -297,6 +303,28 @@ static struct backlight_ops acpi_backlight_ops = {
         .update_status  = acpi_video_set_brightness,
 };
 
+/*video output device sysfs support*/
+static int acpi_video_output_get(struct output_device *od)
+{
+        unsigned long state;
+        struct acpi_video_device *vd =
+                (struct acpi_video_device *)class_get_devdata(&od->class_dev);
+        acpi_video_device_get_state(vd, &state);
+        return (int)state;
+}
+
+static int acpi_video_output_set(struct output_device *od)
+{
+        unsigned long state = od->request_state;
+        struct acpi_video_device *vd=
+                (struct acpi_video_device *)class_get_devdata(&od->class_dev);
+        return acpi_video_device_set_state(vd, state);
+}
+
+static struct output_properties acpi_output_properties = {
+        .set_state = acpi_video_output_set,
+        .get_status = acpi_video_output_get,
+};
 /* --------------------------------------------------------------------------
                                Video Management
    -------------------------------------------------------------------------- */
@@ -531,7 +559,6 @@ acpi_video_bus_DOS(struct acpi_video_bus *video, int bios_flag, int lcd_flag)
 
 static void acpi_video_device_find_cap(struct acpi_video_device *device)
 {
-        acpi_integer status;
         acpi_handle h_dummy1;
         int i;
         u32 max_level = 0;
@@ -565,50 +592,55 @@ static void acpi_video_device_find_cap(struct acpi_video_device *device)
                 device->cap._DSS = 1;
         }
 
-        status = acpi_video_device_lcd_query_levels(device, &obj);
-
-        if (obj && obj->type == ACPI_TYPE_PACKAGE && obj->package.count >= 2) {
-                int count = 0;
-                union acpi_object *o;
-
-                br = kzalloc(sizeof(*br), GFP_KERNEL);
-                if (!br) {
-                        printk(KERN_ERR "can't allocate memory\n");
-                } else {
-                        br->levels = kmalloc(obj->package.count *
-                                             sizeof *(br->levels), GFP_KERNEL);
-                        if (!br->levels)
-                                goto out;
-
-                        for (i = 0; i < obj->package.count; i++) {
-                                o = (union acpi_object *)&obj->package.
-                                    elements[i];
-                                if (o->type != ACPI_TYPE_INTEGER) {
-                                        printk(KERN_ERR PREFIX "Invalid data\n");
-                                        continue;
-                                }
-                                br->levels[count] = (u32) o->integer.value;
-                                if (br->levels[count] > max_level)
-                                        max_level = br->levels[count];
-                                count++;
-                        }
-                      out:
-                        if (count < 2) {
-                                kfree(br->levels);
-                                kfree(br);
+        if (ACPI_SUCCESS(acpi_video_device_lcd_query_levels(device, &obj))) {
+
+                if (obj->package.count >= 2) {
+                        int count = 0;
+                        union acpi_object *o;
+
+                        br = kzalloc(sizeof(*br), GFP_KERNEL);
+                        if (!br) {
+                                printk(KERN_ERR "can't allocate memory\n");
                         } else {
-                                br->count = count;
-                                device->brightness = br;
-                                ACPI_DEBUG_PRINT((ACPI_DB_INFO,
-                                                  "found %d brightness levels\n",
-                                                  count));
+                                br->levels = kmalloc(obj->package.count *
+                                                     sizeof *(br->levels), GFP_KERNEL);
+                                if (!br->levels)
+                                        goto out;
+
+                                for (i = 0; i < obj->package.count; i++) {
+                                        o = (union acpi_object *)&obj->package.
+                                            elements[i];
+                                        if (o->type != ACPI_TYPE_INTEGER) {
+                                                printk(KERN_ERR PREFIX "Invalid data\n");
+                                                continue;
+                                        }
+                                        br->levels[count] = (u32) o->integer.value;
+
+                                        if (br->levels[count] > max_level)
+                                                max_level = br->levels[count];
+                                        count++;
+                                }
+                              out:
+                                if (count < 2) {
+                                        kfree(br->levels);
+                                        kfree(br);
+                                } else {
+                                        br->count = count;
+                                        device->brightness = br;
+                                        ACPI_DEBUG_PRINT((ACPI_DB_INFO,
+                                                          "found %d brightness levels\n",
+                                                          count));
+                                }
                         }
                 }
+
+        } else {
+                ACPI_DEBUG_PRINT((ACPI_DB_INFO, "Could not query available LCD brightness level\n"));
         }
 
         kfree(obj);
 
-        if (device->cap._BCL && device->cap._BCM && device->cap._BQC){
+        if (device->cap._BCL && device->cap._BCM && device->cap._BQC && max_level > 0){
                 unsigned long tmp;
                 static int count = 0;
                 char *name;
@@ -626,6 +658,17 @@ static void acpi_video_device_find_cap(struct acpi_video_device *device)
 
                 kfree(name);
         }
+        if (device->cap._DCS && device->cap._DSS){
+                static int count = 0;
+                char *name;
+                name = kzalloc(MAX_NAME_LEN, GFP_KERNEL);
+                if (!name)
+                        return;
+                sprintf(name, "acpi_video%d", count++);
+                device->output_dev = video_output_register(name,
+                                NULL, device, &acpi_output_properties);
+                kfree(name);
+        }
         return;
 }
 
@@ -1669,6 +1712,7 @@ static int acpi_video_bus_put_one_device(struct acpi_video_device *device)
                                             ACPI_DEVICE_NOTIFY,
                                             acpi_video_device_notify);
         backlight_device_unregister(device->backlight);
+        video_output_unregister(device->output_dev);
         return 0;
 }
 
diff --git a/drivers/video/Kconfig b/drivers/video/Kconfig
index 2a237f09ee5d..564cc9b51822 100644
--- a/drivers/video/Kconfig
+++ b/drivers/video/Kconfig
@@ -12,6 +12,13 @@ config VGASTATE
        tristate
        default n
 
+config VIDEO_OUTPUT_CONTROL
+        tristate "Lowlevel video output switch controls"
+        default m
+        help
+          This framework adds support for low-level control of the video 
+          output switch.
+
 config FB
         tristate "Support for frame buffer devices"
         ---help---
diff --git a/drivers/video/Makefile b/drivers/video/Makefile
index a562f9d69d2c..518933d4905f 100644
--- a/drivers/video/Makefile
+++ b/drivers/video/Makefile
@@ -123,3 +123,6 @@ obj-$(CONFIG_FB_OF)               += offb.o
 
 # the test framebuffer is last
 obj-$(CONFIG_FB_VIRTUAL)          += vfb.o
+
+#video output switch sysfs driver
+obj-$(CONFIG_VIDEO_OUTPUT_CONTROL) += output.o