On Monday, April 22, 2013 08:39:15 PM Chun-Yi Lee wrote:
> From: "Lee, Chun-Yi" <j...@suse.com>
>
> 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 <endr...@gmail.com>
> Cc: Carlos Corbacho <car...@strangeworlds.co.uk>
> Cc: Matthew Garrett <m...@redhat.com>
> Cc: Dmitry Torokhov <d...@mail.ru>
> Cc: Corentin Chary <corenti...@iksaif.net>
> Cc: Rafael J. Wysocki <r...@sisk.pl>
> Cc: Aaron Lu <aaron...@intel.com>
> Cc: Thomas Renninger <tr...@suse.de>
> Signed-off-by: Lee, Chun-Yi <j...@suse.com>
> ---
> 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.
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