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backlight: add backlight type

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There may be multiple ways of controlling the backlight on a given
machine.  Allow drivers to expose the type of interface they are
providing, making it possible for userspace to make appropriate policy
decisions.

Signed-off-by: Matthew Garrett <mjg@redhat.com>
Cc: Richard Purdie <rpurdie@rpsys.net>
Cc: Chris Wilson <chris@chris-wilson.co.uk>
Cc: David Airlie <airlied@linux.ie>
Cc: Alex Deucher <alexdeucher@gmail.com>
Cc: Ben Skeggs <bskeggs@redhat.com>
Cc: Zhang Rui <rui.zhang@intel.com>
Cc: Len Brown <lenb@kernel.org>
Cc: Jesse Barnes <jbarnes@virtuousgeek.org>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
This commit is contained in:
Matthew Garrett 2011-03-22 16:30:21 -07:00 • committed by Linus Torvalds
parent ccd7510fd8
commit bb7ca747f8
59 changed files with 111 additions and 2 deletions
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1
drivers/platform/x86/thinkpad_acpi.c
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@ -6307,6 +6307,7 @@ static int __init brightness_init(struct ibm_init_struct *iibm)
return 1;
memset(&props, 0, sizeof(struct backlight_properties));
props.type = BACKLIGHT_PLATFORM;
props.max_brightness = bright_maxlvl;
props.brightness = b & TP_EC_BACKLIGHT_LVLMSK;
ibm_backlight_device = backlight_device_register(TPACPI_BACKLIGHT_DEV_NAME,