On Monday, April 22, 2013 08:39:15 PM Chun-Yi Lee wrote: > From: "Lee, Chun-Yi" <jlee@xxxxxxxx> > > There have situation we unregister whole acpi/video driver by downstream driver > just want to remove backlight control interface of acpi/video. It caues we lost > other functions of acpi/video, e.g. transfer acpi event to input event. > > So, this patch add a new function, find_video_unregister_backlight, it provide > the interface let downstream driver can tell acpi/video to unregister backlight > interface of all acpi video devices. Then we can keep functions of acpi/video > but only remove backlight support. > > Reference: bko#35622 > https://bugzilla.kernel.org/show_bug.cgi?id=35622 Rui, any comments? Rafael > Tested-by: Andrzej Krentosz <endrjux@xxxxxxxxx> > Cc: Carlos Corbacho <carlos@xxxxxxxxxxxxxxxxxxx> > Cc: Matthew Garrett <mjg@xxxxxxxxxx> > Cc: Dmitry Torokhov <dtor@xxxxxxx> > Cc: Corentin Chary <corentincj@xxxxxxxxxx> > Cc: Rafael J. Wysocki <rjw@xxxxxxx> > Cc: Aaron Lu <aaron.lu@xxxxxxxxx> > Cc: Thomas Renninger <trenn@xxxxxxx> > Signed-off-by: Lee, Chun-Yi <jlee@xxxxxxxx> > --- > drivers/acpi/video.c | 46 ++++++++++++++++++++++++++++++++++++++++++++++ > include/acpi/video.h | 2 ++ > 2 files changed, 48 insertions(+) > > diff --git a/drivers/acpi/video.c b/drivers/acpi/video.c > index 313f959..acd2e7a 100644 > --- a/drivers/acpi/video.c > +++ b/drivers/acpi/video.c > @@ -1793,6 +1793,52 @@ static int __init intel_opregion_present(void) > return opregion; > } > > +static acpi_status > +find_video_unregister_backlight(acpi_handle handle, u32 lvl, void *context, > + void **rv) > +{ > + struct acpi_device *acpi_dev; > + struct acpi_video_bus *video = NULL; > + 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)) { > + video = acpi_driver_data(acpi_dev); > + 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); > + } > + } > + mutex_unlock(&video->device_list_lock); > + acpi_video_bus_start_devices(video); > + } > + return AE_OK; > +} > + > +void acpi_video_backlight_unregister(void) > +{ > + if (!register_count) { > + /* > + * If the acpi video bus is already unloaded, don't > + * unregister backlight of devices and return directly. > + */ > + return; > + } > + acpi_walk_namespace(ACPI_TYPE_DEVICE, ACPI_ROOT_OBJECT, > + ACPI_UINT32_MAX, find_video_unregister_backlight, > + NULL, NULL, NULL); > + return; > +} > +EXPORT_SYMBOL(acpi_video_backlight_unregister); > + > int acpi_video_register(void) > { > int result = 0; > diff --git a/include/acpi/video.h b/include/acpi/video.h > index 61109f2..1e810a1 100644 > --- a/include/acpi/video.h > +++ b/include/acpi/video.h > @@ -19,11 +19,13 @@ struct acpi_device; > #if (defined CONFIG_ACPI_VIDEO || defined CONFIG_ACPI_VIDEO_MODULE) > extern int acpi_video_register(void); > extern void acpi_video_unregister(void); > +extern void acpi_video_backlight_unregister(void); > extern int acpi_video_get_edid(struct acpi_device *device, int type, > int device_id, void **edid); > #else > static inline int acpi_video_register(void) { return 0; } > static inline void acpi_video_unregister(void) { return; } > +static inline void acpi_video_backlight_unregister(void) { return; } > static inline int acpi_video_get_edid(struct acpi_device *device, int type, > int device_id, void **edid) > { > -- I speak only for myself. Rafael J. Wysocki, Intel Open Source Technology Center. -- To unsubscribe from this list: send the line "unsubscribe platform-driver-x86" in the body of a message to majordomo@xxxxxxxxxxxxxxx More majordomo info at http://vger.kernel.org/majordomo-info.html
