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

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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@xxxxxxxxxx>
---
  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@xxxxxxxxxx>");
  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
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