Move the unregistering of the acpi backlight interface on registering of a native backlight from video.c to video_detect.c where it belongs.
Note this removes support for re-registering the acpi backlight interface when the native interface goes away. In practice this never happens and it needlessly complicates the code.
Signed-off-by: Hans de Goede hdegoede@redhat.com --- drivers/acpi/acpi_video.c | 59 ++------------------------------------------- drivers/acpi/video_detect.c | 27 +++++++++++++++++++++ 2 files changed, 29 insertions(+), 57 deletions(-)
diff --git a/drivers/acpi/acpi_video.c b/drivers/acpi/acpi_video.c index 1bbe9b1..f5ffac9 100644 --- a/drivers/acpi/acpi_video.c +++ b/drivers/acpi/acpi_video.c @@ -84,6 +84,7 @@ static struct list_head video_bus_head; static int acpi_video_bus_add(struct acpi_device *device); static int acpi_video_bus_remove(struct acpi_device *device); static void acpi_video_bus_notify(struct acpi_device *device, u32 event); +void acpi_video_detect_exit(void);
static const struct acpi_device_id video_device_ids[] = { {ACPI_VIDEO_HID, 0}, @@ -143,7 +144,6 @@ struct acpi_video_enumerated_device { struct acpi_video_bus { struct acpi_device *device; bool backlight_registered; - bool backlight_notifier_registered; u8 dos_setting; struct acpi_video_enumerated_device *attached_array; u8 attached_count; @@ -156,7 +156,6 @@ struct acpi_video_bus { struct input_dev *input; char phys[32]; /* for input device */ struct notifier_block pm_nb; - struct notifier_block backlight_nb; };
struct acpi_video_device_flags { @@ -1781,59 +1780,6 @@ static void acpi_video_bus_remove_notify_handler(struct acpi_video_bus *video) video->input = NULL; }
-static int acpi_video_backlight_notify(struct notifier_block *nb, - unsigned long val, void *bd) -{ - struct backlight_device *backlight = bd; - struct acpi_video_bus *video; - enum acpi_backlight_type type; - - /* A raw bl (un)registering may change native <-> video */ - if (backlight->props.type != BACKLIGHT_RAW) - return NOTIFY_DONE; - - video = container_of(nb, struct acpi_video_bus, backlight_nb); - type = acpi_video_get_backlight_type(); - - switch (val) { - case BACKLIGHT_REGISTERED: - if (type != acpi_backlight_video) - acpi_video_bus_unregister_backlight(video); - break; - case BACKLIGHT_UNREGISTERED: - if (type == acpi_backlight_video) - acpi_video_bus_register_backlight(video); - break; - } - - return NOTIFY_OK; -} - -static int acpi_video_bus_add_backlight_notify_handler( - struct acpi_video_bus *video) -{ - int error; - - video->backlight_nb.notifier_call = acpi_video_backlight_notify; - video->backlight_nb.priority = 0; - error = backlight_register_notifier(&video->backlight_nb); - if (error == 0) - video->backlight_notifier_registered = true; - - return error; -} - -static int acpi_video_bus_remove_backlight_notify_handler( - struct acpi_video_bus *video) -{ - if (!video->backlight_notifier_registered) - return 0; - - video->backlight_notifier_registered = false; - - return backlight_unregister_notifier(&video->backlight_nb); -} - static int acpi_video_bus_put_devices(struct acpi_video_bus *video) { struct acpi_video_device *dev, *next; @@ -1915,7 +1861,6 @@ static int acpi_video_bus_add(struct acpi_device *device)
acpi_video_bus_register_backlight(video); acpi_video_bus_add_notify_handler(video); - acpi_video_bus_add_backlight_notify_handler(video);
return 0;
@@ -1939,7 +1884,6 @@ static int acpi_video_bus_remove(struct acpi_device *device)
video = acpi_driver_data(device);
- acpi_video_bus_remove_backlight_notify_handler(video); acpi_video_bus_remove_notify_handler(video); acpi_video_bus_unregister_backlight(video); acpi_video_bus_put_devices(video); @@ -2075,6 +2019,7 @@ static int __init acpi_video_init(void)
static void __exit acpi_video_exit(void) { + acpi_video_detect_exit(); acpi_video_unregister();
return; diff --git a/drivers/acpi/video_detect.c b/drivers/acpi/video_detect.c index f9934dc..c683597 100644 --- a/drivers/acpi/video_detect.c +++ b/drivers/acpi/video_detect.c @@ -37,6 +37,9 @@ ACPI_MODULE_NAME("video"); #define _COMPONENT ACPI_VIDEO_COMPONENT
+static bool backlight_notifier_registered; +static struct notifier_block backlight_nb; + static enum acpi_backlight_type acpi_backlight_cmdline = acpi_backlight_undef; static enum acpi_backlight_type acpi_backlight_dmi = acpi_backlight_undef;
@@ -257,6 +260,20 @@ static struct dmi_system_id video_detect_dmi_table[] = { { }, };
+static int acpi_video_backlight_notify(struct notifier_block *nb, + unsigned long val, void *bd) +{ + struct backlight_device *backlight = bd; + + /* A raw bl registering may change video -> native */ + if (backlight->props.type == BACKLIGHT_RAW && + val == BACKLIGHT_REGISTERED && + acpi_video_get_backlight_type() != acpi_backlight_video) + acpi_video_unregister_backlight(); + + return NOTIFY_OK; +} + /* * Determine which type of backlight interface to use on this system, * First check cmdline, then dmi quirks, then do autodetect. @@ -285,6 +302,10 @@ enum acpi_backlight_type acpi_video_get_backlight_type(void) acpi_walk_namespace(ACPI_TYPE_DEVICE, ACPI_ROOT_OBJECT, ACPI_UINT32_MAX, find_video, NULL, &video_caps, NULL); + backlight_nb.notifier_call = acpi_video_backlight_notify; + backlight_nb.priority = 0; + if (backlight_register_notifier(&backlight_nb) == 0) + backlight_notifier_registered = true; init_done = true; } mutex_unlock(&init_mutex); @@ -349,3 +370,9 @@ int acpi_video_backlight_support(void) return acpi_video_get_backlight_type() != acpi_backlight_vendor; } EXPORT_SYMBOL(acpi_video_backlight_support); + +void __exit acpi_video_detect_exit(void) +{ + if (backlight_notifier_registered) + backlight_unregister_notifier(&backlight_nb); +}