linux.git/drivers/video/backlight, branch v2.6.37

backlight: cr_bllcd.c: fix a memory leak

2010-12-23T03:43:34+00:00

Signed-off-by: Axel Lin 
Cc: Thomas Hellstrom 
Cc: Alan Hourihane 
Cc: Richard Purdie 
Signed-off-by: Andrew Morton 
Signed-off-by: Linus Torvalds

backlight: grab ops_lock before testing bd->ops

2010-11-24T21:50:47+00:00

According to the comment describing ops_lock in the definition of struct
backlight_device and when comparing with other functions in backlight.c
the mutex must be hold when checking ops to be non-NULL.

Fixes a problem added by c835ee7f4154992e6 ("backlight: Add suspend/resume
support to the backlight core") in Jan 2009.

Signed-off-by: Uwe Kleine-König 
Acked-by: Richard Purdie 
Cc: 
Signed-off-by: Andrew Morton 
Signed-off-by: Linus Torvalds

backlight: MacBookAir3,1(3,2) mbp-nvidia-bl support

2010-11-12T15:55:33+00:00

Add support for the MacBookAir3,1 and MacBookAir3,2 to the mbp-nvidia-bl
driver.

Signed-off-by: Edgar (gimli) Hucek 
Acked-by: Richard Purdie 
Signed-off-by: Andrew Morton 
Signed-off-by: Linus Torvalds

drivers/video/backlight/adp8860_bl.c: check strict_strtoul() return value

2010-11-12T15:55:33+00:00

Handle return value, strict_strtoul is declared with attribute
warn_unused_result.

Signed-off-by: Michael Hennerich 
Cc: Mike Frysinger 
Acked-by: Richard Purdie 
Cc: Stephen Rothwell 
Signed-off-by: Andrew Morton 
Signed-off-by: Linus Torvalds

drivers/video/backlight/adp8860_bl.c: fix ambient light zone overwrite handling

2010-11-12T15:55:33+00:00

This affects the get/set of the current Ambient Light Zone.  Reading
should return an integer between 1..3 (1 = Daylight, 2 = office, 3 =
dark).  Writing a value between 1..3 forces the backlight controller to
enter the corresponding Ambient Light Zone.  Writing 0 returns to normal
operation.

Fix valid range checking so we don't write invalid values to the
controller, and make sure we subtract 1, since this is what the register
definition (CFGR:BLV) requires.  Otherwise the values written don't work
correctly.

Signed-off-by: Michael Hennerich 
Signed-off-by: Mike Frysinger 
Acked-by: Richard Purdie 
Signed-off-by: Andrew Morton 
Signed-off-by: Linus Torvalds

backlight: add low threshold to pwm backlight

2010-11-12T15:55:33+00:00

The intensity of the backlight can be varied from a range of
max_brightness to zero.  Though most, if not all the pwm based backlight
devices start flickering at lower brightness value.  And also for each
device there exists a brightness value below which the backlight appears
to be turned off though the value is not equal to zero.

If the range of brightness for a device is from zero to max_brightness.  A
graph is plotted for brightness Vs intensity for the pwm based backlight
device has to be a linear graph.

intensity
	  |   /
	  |  /
	  | /
	  |/
	  ---------
	 0	max_brightness

But pratically on measuring the above we note that the intensity of
backlight goes to zero(OFF) when the value in not zero almost nearing to
zero(some x%).  so the graph looks like

intensity
	  |    /
	  |   /
	  |  /
	  |  |
	  ------------
	 0   x	 max_brightness

In order to overcome this drawback knowing this x% i.e nothing but the low
threshold beyond which the backlight is off and will have no effect, the
brightness value is being offset by the low threshold value(retaining the
linearity of the graph).  Now the graph becomes

intensity
	  |     /
	  |    /
	  |   /
	  |  /
	  -------------
	   0	  max_brightness

With this for each and every digit increment in the brightness from zero
there is a change in the intensity of backlight.  Devices having this
behaviour can set the low threshold brightness(lth_brightness) and pass
the same as platform data else can have it as zero.

[akpm@linux-foundation.org: coding-style fixes]
Signed-off-by: Arun Murthy 
Acked-by: Linus Walleij 
Acked-by: Richard Purdie 
Signed-off-by: Andrew Morton 
Signed-off-by: Linus Torvalds

drivers/video/backlight/s6e63m0.c: fix section mismatch

2010-11-12T15:55:33+00:00

Eliminate section mismatch warning by marking s6e63m0_probe() as __devinit.

Signed-off-by: Axel Lin 
Acked-by: Richard Purdie 
Cc: InKi Dae 
Signed-off-by: Andrew Morton 
Signed-off-by: Linus Torvalds

drivers/video/backlight/s6e63m0.c: unregister backlight device and remove sysfs attribute file in s6e63m0_remove

2010-11-12T15:55:33+00:00

s6e63m0_probe() registered backlight device and create sysfs attribute
files, thus s6e63m0_remove() should unregister backlight device and remove
sysfs attribute files.

Signed-off-by: Axel Lin 
Acked-by: Richard Purdie 
Cc: InKi Dae 
Signed-off-by: Andrew Morton 
Signed-off-by: Linus Torvalds

backlight: fix blanking for L4F00242T03 LCD

2010-11-12T15:55:33+00:00

The LCD was turned on if the variable power was > 0, but that was
incorrect.  The LCD has to be turned on in NORMAL and UNBLANK case.

Signed-off-by: Marek Vasut 
Acked-by: Richard Purdie 
Signed-off-by: Andrew Morton 
Signed-off-by: Linus Torvalds

backlight: fix blanking for LMS283GF05 LCD

2010-11-12T15:55:33+00:00

The LCD was turned on if the variable power was > 0, but that was
incorrect.  The LCD has to be turned on in NORMAL and UNBLANK case.

Signed-off-by: Marek Vasut 
Acked-by: Richard Purdie 
Signed-off-by: Andrew Morton 
Signed-off-by: Linus Torvalds