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: Luming Yu <Luming.yu@intel.com> Signed-off-by: Len Brown <len.brown@intel.com>
This commit is contained in:
parent
de372ecd80
commit
23b0f015bf
|
@ -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
|
||||
|
|
|
@ -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;
|
||||
}
|
||||
|
||||
|
|
|
@ -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---
|
||||
|
|
|
@ -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
|
||||
|
|
Loading…
Reference in a new issue