4 files changed, 126 insertions, 141 deletions

diff --git a/drivers/acpi/Kconfig b/drivers/acpi/Kconfig
index f4f000abc4e9..50e295b08c94 100644
--- a/drivers/acpi/Kconfig
+++ b/drivers/acpi/Kconfig
@@ -107,7 +107,7 @@ config ACPI_BUTTON
 
 config ACPI_VIDEO
         tristate "Video"
-        depends on X86
+        depends on X86 && BACKLIGHT_CLASS_DEVICE
         help
           This driver implement the ACPI Extensions For Display Adapters
           for integrated graphics devices on motherboard, as specified in
diff --git a/drivers/acpi/glue.c b/drivers/acpi/glue.c
index 8a0324b43e53..7b6c9ff9bebe 100644
--- a/drivers/acpi/glue.c
+++ b/drivers/acpi/glue.c
@@ -86,129 +86,6 @@ static int acpi_find_bridge_device(struct device *dev, acpi_handle * handle)
         return ret;
 }
 
-/* Get PCI root bridge's handle from its segment and bus number */
-struct acpi_find_pci_root {
-        unsigned int seg;
-        unsigned int bus;
-        acpi_handle handle;
-};
-
-static acpi_status
-do_root_bridge_busnr_callback(struct acpi_resource *resource, void *data)
-{
-        unsigned long *busnr = data;
-        struct acpi_resource_address64 address;
-
-        if (resource->type != ACPI_RESOURCE_TYPE_ADDRESS16 &&
-            resource->type != ACPI_RESOURCE_TYPE_ADDRESS32 &&
-            resource->type != ACPI_RESOURCE_TYPE_ADDRESS64)
-                return AE_OK;
-
-        acpi_resource_to_address64(resource, &address);
-        if ((address.address_length > 0) &&
-            (address.resource_type == ACPI_BUS_NUMBER_RANGE))
-                *busnr = address.minimum;
-
-        return AE_OK;
-}
-
-static int get_root_bridge_busnr(acpi_handle handle)
-{
-        acpi_status status;
-        unsigned long bus, bbn;
-        struct acpi_buffer buffer = { ACPI_ALLOCATE_BUFFER, NULL };
-
-        acpi_get_name(handle, ACPI_FULL_PATHNAME, &buffer);
-
-        status = acpi_evaluate_integer(handle, METHOD_NAME__BBN, NULL,
-                                       &bbn);
-        if (status == AE_NOT_FOUND) {
-                /* Assume bus = 0 */
-                printk(KERN_INFO PREFIX
-                       "Assume root bridge [%s] bus is 0\n",
-                       (char *)buffer.pointer);
-                status = AE_OK;
-                bbn = 0;
-        }
-        if (ACPI_FAILURE(status)) {
-                bbn = -ENODEV;
-                goto exit;
-        }
-        if (bbn > 0)
-                goto exit;
-
-        /* _BBN in some systems return 0 for all root bridges */
-        bus = -1;
-        status = acpi_walk_resources(handle, METHOD_NAME__CRS,
-                                     do_root_bridge_busnr_callback, &bus);
-        /* If _CRS failed, we just use _BBN */
-        if (ACPI_FAILURE(status) || (bus == -1))
-                goto exit;
-        /* We select _CRS */
-        if (bbn != bus) {
-                printk(KERN_INFO PREFIX
-                       "_BBN and _CRS returns different value for %s. Select _CRS\n",
-                       (char *)buffer.pointer);
-                bbn = bus;
-        }
-      exit:
-        kfree(buffer.pointer);
-        return (int)bbn;
-}
-
-static acpi_status
-find_pci_rootbridge(acpi_handle handle, u32 lvl, void *context, void **rv)
-{
-        struct acpi_find_pci_root *find = (struct acpi_find_pci_root *)context;
-        unsigned long seg, bus;
-        acpi_status status;
-        int tmp;
-        struct acpi_buffer buffer = { ACPI_ALLOCATE_BUFFER, NULL };
-
-        acpi_get_name(handle, ACPI_FULL_PATHNAME, &buffer);
-
-        status = acpi_evaluate_integer(handle, METHOD_NAME__SEG, NULL, &seg);
-        if (status == AE_NOT_FOUND) {
-                /* Assume seg = 0 */
-                status = AE_OK;
-                seg = 0;
-        }
-        if (ACPI_FAILURE(status)) {
-                status = AE_CTRL_DEPTH;
-                goto exit;
-        }
-
-        tmp = get_root_bridge_busnr(handle);
-        if (tmp < 0) {
-                printk(KERN_ERR PREFIX
-                       "Find root bridge failed for %s\n",
-                       (char *)buffer.pointer);
-                status = AE_CTRL_DEPTH;
-                goto exit;
-        }
-        bus = tmp;
-
-        if (seg == find->seg && bus == find->bus)
-        {
-                find->handle = handle;
-                status = AE_CTRL_TERMINATE;
-        }
-        else
-                status = AE_OK;
-      exit:
-        kfree(buffer.pointer);
-        return status;
-}
-
-acpi_handle acpi_get_pci_rootbridge_handle(unsigned int seg, unsigned int bus)
-{
-        struct acpi_find_pci_root find = { seg, bus, NULL };
-
-        acpi_get_devices(PCI_ROOT_HID_STRING, find_pci_rootbridge, &find, NULL);
-        return find.handle;
-}
-EXPORT_SYMBOL_GPL(acpi_get_pci_rootbridge_handle);
-
 /* Get device's handler per its address under its parent */
 struct acpi_find_child {
         acpi_handle handle;
diff --git a/drivers/acpi/pci_root.c b/drivers/acpi/pci_root.c
index a860efa2c562..1f06229040ac 100644
--- a/drivers/acpi/pci_root.c
+++ b/drivers/acpi/pci_root.c
@@ -117,6 +117,19 @@ void acpi_pci_unregister_driver(struct acpi_pci_driver *driver)
 
 EXPORT_SYMBOL(acpi_pci_unregister_driver);
 
+acpi_handle acpi_get_pci_rootbridge_handle(unsigned int seg, unsigned int bus)
+{
+        struct acpi_pci_root *tmp;
+        
+        list_for_each_entry(tmp, &acpi_pci_roots, node) {
+                if ((tmp->id.segment == (u16) seg) && (tmp->id.bus == (u16) bus))
+                        return tmp->device->handle;
+        }
+        return NULL;            
+}
+
+EXPORT_SYMBOL_GPL(acpi_get_pci_rootbridge_handle);
+
 static acpi_status
 get_root_bridge_busnr_callback(struct acpi_resource *resource, void *data)
 {
diff --git a/drivers/acpi/video.c b/drivers/acpi/video.c
index 3d54680d0333..a695aeb8b2a7 100644
--- a/drivers/acpi/video.c
+++ b/drivers/acpi/video.c
@@ -32,6 +32,7 @@
 #include <linux/proc_fs.h>
 #include <linux/seq_file.h>
 
+#include <linux/backlight.h>
 #include <asm/uaccess.h>
 
 #include <acpi/acpi_bus.h>
@@ -56,6 +57,12 @@
 
 #define ACPI_VIDEO_HEAD_INVALID         (~0u - 1)
 #define ACPI_VIDEO_HEAD_END             (~0u)
+#define MAX_NAME_LEN    20
+
+#define ACPI_VIDEO_DISPLAY_CRT  1
+#define ACPI_VIDEO_DISPLAY_TV   2
+#define ACPI_VIDEO_DISPLAY_DVI  3
+#define ACPI_VIDEO_DISPLAY_LCD  4
 
 #define _COMPONENT              ACPI_VIDEO_COMPONENT
 ACPI_MODULE_NAME("acpi_video")
@@ -133,20 +140,21 @@ struct acpi_video_device_flags {
         u8 crt:1;
         u8 lcd:1;
         u8 tvout:1;
+        u8 dvi:1;
         u8 bios:1;
         u8 unknown:1;
-        u8 reserved:3;
+        u8 reserved:2;
 };
 
 struct acpi_video_device_cap {
         u8 _ADR:1;              /*Return the unique ID */
         u8 _BCL:1;              /*Query list of brightness control levels supported */
         u8 _BCM:1;              /*Set the brightness level */
+        u8 _BQC:1;              /* Get current brightness level */
         u8 _DDC:1;              /*Return the EDID for this device */
         u8 _DCS:1;              /*Return status of output device */
         u8 _DGS:1;              /*Query graphics state */
         u8 _DSS:1;              /*Device state set */
-        u8 _reserved:1;
 };
 
 struct acpi_video_device_brightness {
@@ -163,6 +171,8 @@ struct acpi_video_device {
         struct acpi_video_bus *video;
         struct acpi_device *dev;
         struct acpi_video_device_brightness *brightness;
+        struct backlight_device *backlight;
+        struct backlight_properties *data;
 };
 
 /* bus */
@@ -257,11 +267,35 @@ static void acpi_video_device_bind(struct acpi_video_bus *video,
                                    struct acpi_video_device *device);
 static int acpi_video_device_enumerate(struct acpi_video_bus *video);
 static int acpi_video_switch_output(struct acpi_video_bus *video, int event);
+static int acpi_video_device_lcd_set_level(struct acpi_video_device *device,
+                        int level);
+static int acpi_video_device_lcd_get_level_current(
+                        struct acpi_video_device *device,
+                        unsigned long *level);
 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);
 
+/*backlight device sysfs support*/
+static int acpi_video_get_brightness(struct backlight_device *bd)
+{
+        unsigned long cur_level;
+        struct acpi_video_device *vd =
+                (struct acpi_video_device *)class_get_devdata(&bd->class_dev);
+        acpi_video_device_lcd_get_level_current(vd, &cur_level);
+        return (int) cur_level;
+}
+
+static int acpi_video_set_brightness(struct backlight_device *bd)
+{
+        int request_level = bd->props->brightness;
+        struct acpi_video_device *vd =
+                (struct acpi_video_device *)class_get_devdata(&bd->class_dev);
+        acpi_video_device_lcd_set_level(vd, request_level);
+        return 0;
+}
+
 /* --------------------------------------------------------------------------
                                Video Management
    -------------------------------------------------------------------------- */
@@ -499,6 +533,7 @@ 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;
         union acpi_object *obj = NULL;
         struct acpi_video_device_brightness *br = NULL;
 
@@ -514,6 +549,8 @@ static void acpi_video_device_find_cap(struct acpi_video_device *device)
         if (ACPI_SUCCESS(acpi_get_handle(device->dev->handle, "_BCM", &h_dummy1))) {
                 device->cap._BCM = 1;
         }
+        if (ACPI_SUCCESS(acpi_get_handle(device->dev->handle,"_BQC",&h_dummy1)))
+                device->cap._BQC = 1;
         if (ACPI_SUCCESS(acpi_get_handle(device->dev->handle, "_DDC", &h_dummy1))) {
                 device->cap._DDC = 1;
         }
@@ -550,6 +587,8 @@ static void acpi_video_device_find_cap(struct acpi_video_device *device)
                                         continue;
                                 }
                                 br->levels[count] = (u32) o->integer.value;
+                                if (br->levels[count] > max_level)
+                                        max_level = br->levels[count];
                                 count++;
                         }
                       out:
@@ -568,6 +607,37 @@ static void acpi_video_device_find_cap(struct acpi_video_device *device)
 
         kfree(obj);
 
+        if (device->cap._BCL && device->cap._BCM && device->cap._BQC){
+                unsigned long tmp;
+                static int count = 0;
+                char *name;
+                struct backlight_properties *acpi_video_data;
+
+                name = kzalloc(MAX_NAME_LEN, GFP_KERNEL);
+                if (!name)
+                        return;
+
+                acpi_video_data = kzalloc(
+                        sizeof(struct backlight_properties),
+                        GFP_KERNEL);
+                if (!acpi_video_data){
+                        kfree(name);
+                        return;
+                }
+                acpi_video_data->owner = THIS_MODULE;
+                acpi_video_data->get_brightness =
+                        acpi_video_get_brightness;
+                acpi_video_data->update_status =
+                        acpi_video_set_brightness;
+                sprintf(name, "acpi_video%d", count++);
+                device->data = acpi_video_data;
+                acpi_video_data->max_brightness = max_level;
+                acpi_video_device_lcd_get_level_current(device, &tmp);
+                acpi_video_data->brightness = (int)tmp;
+                device->backlight = backlight_device_register(name,
+                        NULL, device, acpi_video_data);
+                kfree(name);
+        }
         return;
 }
 
@@ -668,6 +738,8 @@ static int acpi_video_device_info_seq_show(struct seq_file *seq, void *offset)
                 seq_printf(seq, "LCD\n");
         else if (dev->flags.tvout)
                 seq_printf(seq, "TVOUT\n");
+        else if (dev->flags.dvi)
+                seq_printf(seq, "DVI\n");
         else
                 seq_printf(seq, "UNKNOWN\n");
 
@@ -1242,6 +1314,16 @@ static int acpi_video_bus_remove_fs(struct acpi_device *device)
    -------------------------------------------------------------------------- */
 
 /* device interface */
+static struct acpi_video_device_attrib*
+acpi_video_get_device_attr(struct acpi_video_bus *video, unsigned long device_id)
+{
+        int count;
+
+        for(count = 0; count < video->attached_count; count++)
+                if((video->attached_array[count].value.int_val & 0xffff) == device_id)
+                        return &(video->attached_array[count].value.attrib);
+        return NULL;
+}
 
 static int
 acpi_video_bus_get_one_device(struct acpi_device *device,
@@ -1250,7 +1332,7 @@ acpi_video_bus_get_one_device(struct acpi_device *device,
         unsigned long device_id;
         int status;
         struct acpi_video_device *data;
-
+        struct acpi_video_device_attrib* attribute;
 
         if (!device || !video)
                 return -EINVAL;
@@ -1271,20 +1353,30 @@ acpi_video_bus_get_one_device(struct acpi_device *device,
                 data->video = video;
                 data->dev = device;
 
-                switch (device_id & 0xffff) {
-                case 0x0100:
-                        data->flags.crt = 1;
-                        break;
-                case 0x0400:
-                        data->flags.lcd = 1;
-                        break;
-                case 0x0200:
-                        data->flags.tvout = 1;
-                        break;
-                default:
+                attribute = acpi_video_get_device_attr(video, device_id);
+
+                if((attribute != NULL) && attribute->device_id_scheme) {
+                        switch (attribute->display_type) {
+                        case ACPI_VIDEO_DISPLAY_CRT:
+                                data->flags.crt = 1;
+                                break;
+                        case ACPI_VIDEO_DISPLAY_TV:
+                                data->flags.tvout = 1;
+                                break;
+                        case ACPI_VIDEO_DISPLAY_DVI:
+                                data->flags.dvi = 1;
+                                break;
+                        case ACPI_VIDEO_DISPLAY_LCD:
+                                data->flags.lcd = 1;
+                                break;
+                        default:
+                                data->flags.unknown = 1;
+                                break;
+                        }
+                        if(attribute->bios_can_detect)
+                                data->flags.bios = 1;
+                } else
                         data->flags.unknown = 1;
-                        break;
-                }
 
                 acpi_video_device_bind(video, data);
                 acpi_video_device_find_cap(data);
@@ -1588,7 +1680,10 @@ static int acpi_video_bus_put_one_device(struct acpi_video_device *device)
         status = acpi_remove_notify_handler(device->dev->handle,
                                             ACPI_DEVICE_NOTIFY,
                                             acpi_video_device_notify);
-
+        if (device->backlight){
+                backlight_device_unregister(device->backlight);
+                kfree(device->data);
+        }
         return 0;
 }