Commit 23b0f015 authored by Luming Yu's avatar Luming Yu Committed by Len Brown
Browse files

ACPI: video: output switch sysfs support 



Requires CONFIG_VIDEO_OUTPUT_CONTROL and CONFIG_ACPI_VIDEO.

After loading output.ko and video.ko, you would have
/sys/class/video_output and several device acpi_videoNum there.

For example, I got acpi_video0, acpi_video1,acpi_video2,and acpi_video3
under /sys/class/video_output on my T40.
I can query the status of  output device0 by running " cat
/sys/class/video_output/acpi_video0
" The return value is defined in ACPI SPEC B.5.5 _DCS(Return the
Status of Output Device).  Also you can turn off video1 and turn on
video0  by " echo 0 > acpi_video1; echo 0x80000000 > acpi_video0".
Please reference ACPI SPEC  B.5.7 _DSS for the parameter definition.

Please note that it may or may NOT works purely depending on if
your vendor providing correct ACPI video extension support in bios.
the driver output.ko and video.ko just works like a interface to
invoke BIOS.

Signed-off-by: default avatarLuming Yu <Luming.yu@intel.com>
Signed-off-by: default avatarLen Brown <len.brown@intel.com>
parent de372ecd

drivers/acpi/Kconfig

+1 −1
Original line number Diff line number Diff line
@@ -124,7 +124,7 @@ 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

drivers/acpi/video.c

+40 −0
Original line number Diff line number Diff line
@@ -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

   -------------------------------------------------------------------------- */
@@ -626,6 +654,17 @@ 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 +1708,7 @@ 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;

}

drivers/video/Kconfig

+7 −0
Original line number Diff line number Diff line
@@ -11,6 +11,13 @@ 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---

drivers/video/Makefile

+3 −0
Original line number Diff line number Diff line
@@ -119,3 +119,6 @@ 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

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