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Diffstat (limited to 'drivers/acpi/video.c')
-rw-r--r--drivers/acpi/video.c98
1 files changed, 85 insertions, 13 deletions
diff --git a/drivers/acpi/video.c b/drivers/acpi/video.c
index 5d7075d25700..6dd237e79b4f 100644
--- a/drivers/acpi/video.c
+++ b/drivers/acpi/video.c
@@ -44,6 +44,8 @@
#include <linux/suspend.h>
#include <acpi/video.h>
+#include "internal.h"
+
#define PREFIX "ACPI: "
#define ACPI_VIDEO_BUS_NAME "Video Bus"
@@ -450,6 +452,14 @@ static struct dmi_system_id video_dmi_table[] __initdata = {
},
{
.callback = video_ignore_initial_backlight,
+ .ident = "Fujitsu E753",
+ .matches = {
+ DMI_MATCH(DMI_BOARD_VENDOR, "FUJITSU"),
+ DMI_MATCH(DMI_PRODUCT_NAME, "LIFEBOOK E753"),
+ },
+ },
+ {
+ .callback = video_ignore_initial_backlight,
.ident = "HP Pavilion dm4",
.matches = {
DMI_MATCH(DMI_BOARD_VENDOR, "Hewlett-Packard"),
@@ -898,7 +908,10 @@ static void acpi_video_device_find_cap(struct acpi_video_device *device)
device->cap._DDC = 1;
}
- if (acpi_video_backlight_support()) {
+ if (acpi_video_init_brightness(device))
+ return;
+
+ if (acpi_video_verify_backlight_support()) {
struct backlight_properties props;
struct pci_dev *pdev;
acpi_handle acpi_parent;
@@ -907,9 +920,6 @@ static void acpi_video_device_find_cap(struct acpi_video_device *device)
static int count = 0;
char *name;
- result = acpi_video_init_brightness(device);
- if (result)
- return;
name = kasprintf(GFP_KERNEL, "acpi_video%d", count);
if (!name)
return;
@@ -969,6 +979,11 @@ static void acpi_video_device_find_cap(struct acpi_video_device *device)
if (result)
printk(KERN_ERR PREFIX "Create sysfs link\n");
+ } else {
+ /* Remove the brightness object. */
+ kfree(device->brightness->levels);
+ kfree(device->brightness);
+ device->brightness = NULL;
}
}
@@ -1351,8 +1366,8 @@ acpi_video_switch_brightness(struct acpi_video_device *device, int event)
unsigned long long level_current, level_next;
int result = -EINVAL;
- /* no warning message if acpi_backlight=vendor is used */
- if (!acpi_video_backlight_support())
+ /* no warning message if acpi_backlight=vendor or a quirk is used */
+ if (!acpi_video_verify_backlight_support())
return 0;
if (!device->brightness)
@@ -1532,14 +1547,20 @@ static int acpi_video_bus_put_devices(struct acpi_video_bus *video)
/* acpi_video interface */
+/*
+ * Win8 requires setting bit2 of _DOS to let firmware know it shouldn't
+ * preform any automatic brightness change on receiving a notification.
+ */
static int acpi_video_bus_start_devices(struct acpi_video_bus *video)
{
- return acpi_video_bus_DOS(video, 0, 0);
+ return acpi_video_bus_DOS(video, 0,
+ acpi_video_backlight_quirks() ? 1 : 0);
}
static int acpi_video_bus_stop_devices(struct acpi_video_bus *video)
{
- return acpi_video_bus_DOS(video, 0, 1);
+ return acpi_video_bus_DOS(video, 0,
+ acpi_video_backlight_quirks() ? 0 : 1);
}
static void acpi_video_bus_notify(struct acpi_device *device, u32 event)
@@ -1854,6 +1875,46 @@ static int acpi_video_bus_remove(struct acpi_device *device)
return 0;
}
+static acpi_status video_unregister_backlight(acpi_handle handle, u32 lvl,
+ void *context, void **rv)
+{
+ struct acpi_device *acpi_dev;
+ struct acpi_video_bus *video;
+ struct acpi_video_device *dev, *next;
+
+ if (acpi_bus_get_device(handle, &acpi_dev))
+ return AE_OK;
+
+ if (acpi_match_device_ids(acpi_dev, video_device_ids))
+ return AE_OK;
+
+ video = acpi_driver_data(acpi_dev);
+ if (!video)
+ return AE_OK;
+
+ acpi_video_bus_stop_devices(video);
+ mutex_lock(&video->device_list_lock);
+ list_for_each_entry_safe(dev, next, &video->video_device_list, entry) {
+ if (dev->backlight) {
+ backlight_device_unregister(dev->backlight);
+ dev->backlight = NULL;
+ kfree(dev->brightness->levels);
+ kfree(dev->brightness);
+ }
+ if (dev->cooling_dev) {
+ sysfs_remove_link(&dev->dev->dev.kobj,
+ "thermal_cooling");
+ sysfs_remove_link(&dev->cooling_dev->device.kobj,
+ "device");
+ thermal_cooling_device_unregister(dev->cooling_dev);
+ dev->cooling_dev = NULL;
+ }
+ }
+ mutex_unlock(&video->device_list_lock);
+ acpi_video_bus_start_devices(video);
+ return AE_OK;
+}
+
static int __init is_i740(struct pci_dev *dev)
{
if (dev->device == 0x00D1)
@@ -1885,14 +1946,25 @@ static int __init intel_opregion_present(void)
return opregion;
}
-int acpi_video_register(void)
+int __acpi_video_register(bool backlight_quirks)
{
- int result = 0;
+ bool no_backlight;
+ int result;
+
+ no_backlight = backlight_quirks ? acpi_video_backlight_quirks() : false;
+
if (register_count) {
/*
- * if the function of acpi_video_register is already called,
- * don't register the acpi_vide_bus again and return no error.
+ * If acpi_video_register() has been called already, don't try
+ * to register acpi_video_bus, but unregister backlight devices
+ * if no backlight support is requested.
*/
+ if (no_backlight)
+ acpi_walk_namespace(ACPI_TYPE_DEVICE, ACPI_ROOT_OBJECT,
+ ACPI_UINT32_MAX,
+ video_unregister_backlight,
+ NULL, NULL, NULL);
+
return 0;
}
@@ -1908,7 +1980,7 @@ int acpi_video_register(void)
return 0;
}
-EXPORT_SYMBOL(acpi_video_register);
+EXPORT_SYMBOL(__acpi_video_register);
void acpi_video_unregister(void)
{