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ACPI: video: Rationalise ACPI backlight implementation 

The sysfs backlight class provides no mechanism for querying the
acceptable brightness for a backlight. The ACPI spec states that values
are only valid if they are reported as available by the firmware. Since
we can't provide that information to userspace, instead collapse the
range to the number of actual values that can be set.

http://bugzilla.kernel.org/show_bug.cgi?id=9277

Signed-off-by: Matthew Garrett <mjg59@srcf.ucam.org>
Acked-by: Zhang Rui <rui.zhang@intel.com>
Signed-off-by: Len Brown <len.brown@intel.com>
hifive-unleashed-5.1
Matthew Garrett 2007-12-26 02:03:26 +00:00 committed by Len Brown
parent aa62999269
commit 38531e6fe5
1 changed files with 13 additions and 7 deletions
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20
drivers/acpi/video.c
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@ -292,18 +292,26 @@ static int acpi_video_device_set_state(struct acpi_video_device *device, int sta
static int acpi_video_get_brightness(struct backlight_device *bd)
{
unsigned long cur_level;
int i;
struct acpi_video_device *vd =
(struct acpi_video_device *)bl_get_data(bd);
acpi_video_device_lcd_get_level_current(vd, &cur_level);
return (int) cur_level;
for (i = 2; i < vd->brightness->count; i++) {
if (vd->brightness->levels[i] == cur_level)
/* The first two entries are special - see page 575
of the ACPI spec 3.0 */
return i-2;
}
return 0;
}
static int acpi_video_set_brightness(struct backlight_device *bd)
{
int request_level = bd->props.brightness;
int request_level = bd->props.brightness+2;
struct acpi_video_device *vd =
(struct acpi_video_device *)bl_get_data(bd);
acpi_video_device_lcd_set_level(vd, request_level);
acpi_video_device_lcd_set_level(vd,
vd->brightness->levels[request_level]);
return 0;
}
@ -652,7 +660,6 @@ static void acpi_video_device_find_cap(struct acpi_video_device *device)
kfree(obj);
if (device->cap._BCL && device->cap._BCM && device->cap._BQC && max_level > 0){
unsigned long tmp;
static int count = 0;
char *name;
name = kzalloc(MAX_NAME_LEN, GFP_KERNEL);
@ -660,11 +667,10 @@ static void acpi_video_device_find_cap(struct acpi_video_device *device)
return;
sprintf(name, "acpi_video%d", count++);
acpi_video_device_lcd_get_level_current(device, &tmp);
device->backlight = backlight_device_register(name,
NULL, device, &acpi_backlight_ops);
device->backlight->props.max_brightness = max_level;
device->backlight->props.brightness = (int)tmp;
device->backlight->props.max_brightness = device->brightness->count-3;
device->backlight->props.brightness = acpi_video_get_brightness(device->backlight);
backlight_update_status(device->backlight);
kfree(name);