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ACPI: Adds backlight sysfs support for acpi video driver. 

Adds backlight sysfs support for acpi video driver.

signed-off-by: Luming Yu <Luming.yu@intel.com>
Signed-off-by: Len Brown <len.brown@intel.com>
This commit is contained in:
Yu Luming 2006-11-11 02:40:34 +08:00 committed by Len Brown
parent a8274d57af
commit 2f3d000a13
2 changed files with 70 additions and 3 deletions
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2
drivers/acpi/Kconfig
View File

@ -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

71
drivers/acpi/video.c
View File

@ -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;
}