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Commit 2f3d000a authored by Yu Luming's avatar Yu Luming Committed by Len Brown
Browse files

ACPI: Adds backlight sysfs support for acpi video driver. 



Adds backlight sysfs support for acpi video driver.

signed-off-by: default avatarLuming Yu <Luming.yu@intel.com>
Signed-off-by: default avatarLen Brown <len.brown@intel.com>
parent a8274d57

drivers/acpi/Kconfig

+1 −1
Original line number Diff line number Diff line
@@ -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

drivers/acpi/video.c

+69 −2
Original line number Diff line number Diff line
@@ -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;

}