Hi,
On 11-06-15 13:47, Pali Rohár wrote:
On Wednesday 10 June 2015 15:01:19 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-laptop.c | 6 ++----
1 file changed, 2 insertions(+), 4 deletions(-)
diff --git a/drivers/platform/x86/dell-laptop.c b/drivers/platform/x86/dell-laptop.c
index d688d80..db2e031 100644
--- a/drivers/platform/x86/dell-laptop.c
+++ b/drivers/platform/x86/dell-laptop.c
@@ -31,6 +31,7 @@
#include <linux/slab.h>
#include <linux/debugfs.h>
#include <linux/seq_file.h>
+#include <acpi/video.h>
#include "../../firmware/dcdbas.h"
#define BRIGHTNESS_TOKEN 0x7d
@@ -1921,10 +1922,7 @@ static int __init dell_init(void)
&dell_debugfs_fops);
#ifdef CONFIG_ACPI
- /* In the event of an ACPI backlight being available, don't
- * register the platform controller.
- */
- if (acpi_video_backlight_support())
+ if (acpi_video_get_backlight_type() != acpi_backlight_vendor)
return 0;
#endif
Now I'm thinking... Is this correct condition? And do we need it? This
Dell backlight interface works even if ACPI or intel i915 driver
controls backlight. Why we should prevent dell-laptop.ko to register
Dell backlight interface if ACPI video already register one? And why not
prevent when intel i915 driver register another?
3 things:
1) This is mostly a cleanup series, it does not make any behavioral
changes (other then renaming the kernelcmdline option and we've
already discussed fixing that).
2) All 3 drivers ultimately bit-bang the same hardware, we really should
have only one driver banging the hardware, so
if (acpi_video_get_backlight_type() != acpi_backlight_vendor)
return 0;
Definitely is the right thing todo here.
3) You're right that the intel_backlight still registering even if
acpi_video_get_backlight_type() != acpi_backlight_native is weird, but
that is how it was before this series, and userspace prefers firmware
type backlight sysfs entries over platform /raw ones so it will
automatically pick the right one. We should consider not registering
the backlight sysfs class interface from the intel code when
acpi_video_get_backlight_type() != acpi_backlight_native but that is
something for later...
Regards,
Hans
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