[PATCH 20/32] dell-wmi: Port to new backlight interface selection API

[Hans de Goede]

Hi,

On 11-06-15 13:43, Pali Rohár wrote:
> On Wednesday 10 June 2015 15:01:20 Hans de Goede wrote:
>> Port the backlight selection logic to the new backlight interface
>> selection API.
>>
>> Signed-off-by: Hans de Goede <hdegoede at redhat.com>
>> ---
>>   drivers/platform/x86/dell-wmi.c | 3 ++-
>>   1 file changed, 2 insertions(+), 1 deletion(-)
>>
>> diff --git a/drivers/platform/x86/dell-wmi.c b/drivers/platform/x86/dell-wmi.c
>> index 6512a06..f2d77fe 100644
>> --- a/drivers/platform/x86/dell-wmi.c
>> +++ b/drivers/platform/x86/dell-wmi.c
>> @@ -35,6 +35,7 @@
>>   #include <linux/acpi.h>
>>   #include <linux/string.h>
>>   #include <linux/dmi.h>
>> +#include <acpi/video.h>
>>
>>   MODULE_AUTHOR("Matthew Garrett <mjg at redhat.com>");
>>   MODULE_DESCRIPTION("Dell laptop WMI hotkeys driver");
>> @@ -397,7 +398,7 @@ static int __init dell_wmi_init(void)
>>   	}
>>
>>   	dmi_walk(find_hk_type, NULL);
>> -	acpi_video = acpi_video_backlight_support();
>> +	acpi_video = acpi_video_get_backlight_type() != acpi_backlight_vendor;
>>
>>   	err = dell_wmi_input_setup();
>>   	if (err)
>
> Hello,
>
> to make sure that nothing will be broken I will try to explain current
> code. Variable acpi_video is global boolean (for this module) and when
> is set to true it is expected that ACPI generate brightness up/down key
> events via ACPI input device. When is acpi_video boolean variable is set
> to false then ACPI input device should not send brightness up/down keys
> to userspace. And dell-wmi.ko driver send those two keys via dell-wmi
> input device.

I know.

> So please check that your change does not change above behaviour.

I've already checked this.

 > Maybe it would make sense to rename "acpi_video" variable to something better.

There is another driver which has a similar construction. I believe that it
would be good to add an acpi_video_handles_key_presses() helper to the
acpi-video code which can be used for this instead of abusing
acpi_video_get_backlight_type() for this. I've put this on my todo list
to do as a further cleanup once the initial series is merged.

Regards,

Hans