Gitweb:     
http://git.kernel.org/git/?p=linux/kernel/git/torvalds/linux-2.6.git;a=commit;h=2f3d000a133f68250635f14f6caf24d32d358090
Commit:     2f3d000a133f68250635f14f6caf24d32d358090
Parent:     a8274d57afb83e4954ddcb3f8b7dd1c03a379bd4
Author:     Yu Luming <[EMAIL PROTECTED]>
AuthorDate: Sat Nov 11 02:40:34 2006 +0800
Committer:  Len Brown <[EMAIL PROTECTED]>
CommitDate: Wed Dec 20 21:23:16 2006 -0500

    ACPI: Adds backlight sysfs support for acpi video driver.
    
    Adds backlight sysfs support for acpi video driver.
    
    signed-off-by: Luming Yu <[EMAIL PROTECTED]>
    Signed-off-by: Len Brown <[EMAIL PROTECTED]>
---
 drivers/acpi/Kconfig |    2 +-
 drivers/acpi/video.c |   71 ++++++++++++++++++++++++++++++++++++++++++++++++-
 2 files changed, 70 insertions(+), 3 deletions(-)

diff --git a/drivers/acpi/Kconfig b/drivers/acpi/Kconfig
index 6f8c50e..e3f77e2 100644
--- a/drivers/acpi/Kconfig
+++ b/drivers/acpi/Kconfig
@@ -106,7 +106,7 @@ 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/video.c b/drivers/acpi/video.c
index 9200a46..4b09a02 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 +57,7 @@
 
 #define ACPI_VIDEO_HEAD_INVALID                (~0u - 1)
 #define ACPI_VIDEO_HEAD_END            (~0u)
+#define MAX_NAME_LEN   20
 
 #define _COMPONENT             ACPI_VIDEO_COMPONENT
 ACPI_MODULE_NAME("acpi_video")
@@ -142,11 +144,11 @@ 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 +165,8 @@ 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 +261,35 @@ 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 +527,7 @@ 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 +543,8 @@ 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;
        }
@@ -551,6 +582,8 @@ 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:
@@ -569,6 +602,37 @@ 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;
 }
 
@@ -1595,7 +1659,10 @@ 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;
 }
 
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