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| author | Jason Stubbs <jasonbstubbs@gmail.com> | 2011-09-20 18:16:11 +0200 |
|---|---|---|
| committer | Matthew Garrett <mjg@redhat.com> | 2011-10-24 16:52:35 +0200 |
| commit | bee460be8c691c544e84ed678280ace6153104c6 (patch) | |
| tree | dfca717127a7369d99675ee29bef603933b01a8d /drivers/platform/x86/samsung-laptop.c | |
| parent | Platform: samsung_laptop: samsung backlight for R528/R728 (diff) | |
| download | linux-bee460be8c691c544e84ed678280ace6153104c6.tar.xz linux-bee460be8c691c544e84ed678280ace6153104c6.zip | |
platform: samsung_laptop: fix samsung brightness min/max calculations
The min_brightness value of the sabi_config is incorrectly used in brightness
calculations. For the config where min_brightness = 1 and max_brightness = 8,
the user visible range should be 0 to 7 with hardware being set in the range
of 1 to 8. What is actually happening is that the user visible range is 0 to
8 with hardware being set in the range of -1 to 7.
This patch fixes the above issue as well as a miscalculation that would occur
in the case of min_brightness > 1.
Signed-off-by: Jason Stubbs <jasonbstubbs@gmail.com>
Cc: stable <stable@kernel.org>
Signed-off-by: Greg Kroah-Hartman <gregkh@suse.de>
Signed-off-by: Matthew Garrett <mjg@redhat.com>
Diffstat (limited to 'drivers/platform/x86/samsung-laptop.c')
| -rw-r--r-- | drivers/platform/x86/samsung-laptop.c | 9 |
1 files changed, 6 insertions, 3 deletions
diff --git a/drivers/platform/x86/samsung-laptop.c b/drivers/platform/x86/samsung-laptop.c index 37374a5878eb..7eb6733138e6 100644 --- a/drivers/platform/x86/samsung-laptop.c +++ b/drivers/platform/x86/samsung-laptop.c @@ -370,15 +370,17 @@ static u8 read_brightness(void) &sretval); if (!retval) { user_brightness = sretval.retval[0]; - if (user_brightness != 0) + if (user_brightness > sabi_config->min_brightness) user_brightness -= sabi_config->min_brightness; + else + user_brightness = 0; } return user_brightness; } static void set_brightness(u8 user_brightness) { - u8 user_level = user_brightness - sabi_config->min_brightness; + u8 user_level = user_brightness + sabi_config->min_brightness; sabi_set_command(sabi_config->commands.set_brightness, user_level); } @@ -811,7 +813,8 @@ static int __init samsung_init(void) /* create a backlight device to talk to this one */ memset(&props, 0, sizeof(struct backlight_properties)); props.type = BACKLIGHT_PLATFORM; - props.max_brightness = sabi_config->max_brightness; + props.max_brightness = sabi_config->max_brightness - + sabi_config->min_brightness; backlight_device = backlight_device_register("samsung", &sdev->dev, NULL, &backlight_ops, &props); |