diff options
Diffstat (limited to 'drivers/acpi/video.c')
| -rw-r--r-- | drivers/acpi/video.c | 30 |
1 files changed, 22 insertions, 8 deletions
diff --git a/drivers/acpi/video.c b/drivers/acpi/video.c index b8a2095cb5e..bac956b30c5 100644 --- a/drivers/acpi/video.c +++ b/drivers/acpi/video.c @@ -409,14 +409,17 @@ acpi_video_device_lcd_query_levels(struct acpi_video_device *device, static int acpi_video_device_lcd_set_level(struct acpi_video_device *device, int level) { - int status; + int status = AE_OK; union acpi_object arg0 = { ACPI_TYPE_INTEGER }; struct acpi_object_list args = { 1, &arg0 }; arg0.integer.value = level; - status = acpi_evaluate_object(device->dev->handle, "_BCM", &args, NULL); + if (device->cap._BCM) + status = acpi_evaluate_object(device->dev->handle, "_BCM", + &args, NULL); + device->brightness->curr = level; return status; } @@ -424,11 +427,11 @@ static int acpi_video_device_lcd_get_level_current(struct acpi_video_device *device, unsigned long *level) { - int status; - - status = acpi_evaluate_integer(device->dev->handle, "_BQC", NULL, level); - - return status; + if (device->cap._BQC) + return acpi_evaluate_integer(device->dev->handle, "_BQC", NULL, + level); + *level = device->brightness->curr; + return AE_OK; } static int @@ -1633,9 +1636,20 @@ static int acpi_video_get_next_level(struct acpi_video_device *device, u32 level_current, u32 event) { - int min, max, min_above, max_below, i, l; + int min, max, min_above, max_below, i, l, delta = 255; max = max_below = 0; min = min_above = 255; + /* Find closest level to level_current */ + for (i = 0; i < device->brightness->count; i++) { + l = device->brightness->levels[i]; + if (abs(l - level_current) < abs(delta)) { + delta = l - level_current; + if (!delta) + break; + } + } + /* Ajust level_current to closest available level */ + level_current += delta; for (i = 0; i < device->brightness->count; i++) { l = device->brightness->levels[i]; if (l < min) |