57 lines
2.3 KiB
C
57 lines
2.3 KiB
C
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/***************************************************************************
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* __________ __ ___.
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* Open \______ \ ____ ____ | | _\_ |__ _______ ___
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* Source | _// _ \_/ ___\| |/ /| __ \ / _ \ \/ /
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* Jukebox | | ( <_> ) \___| < | \_\ ( <_> > < <
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* Firmware |____|_ /\____/ \___ >__|_ \|___ /\____/__/\_ \
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* \/ \/ \/ \/ \/
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* $Id$
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*
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* Copyright (C) 2016 Amaury Pouly
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*
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* This program is free software; you can redistribute it and/or
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* modify it under the terms of the GNU General Public License
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* as published by the Free Software Foundation; either version 2
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* of the License, or (at your option) any later version.
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*
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* This software is distributed on an "AS IS" basis, WITHOUT WARRANTY OF ANY
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* KIND, either express or implied.
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*
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****************************************************************************/
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#ifndef __NWZ_FB_H__
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#define __NWZ_FB_H__
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#define NWZ_FB_LCD_DEV "/dev/fb/0"
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#define NWZ_FB_TV_DEV "/dev/fb/1"
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#define NWZ_FB_TYPE 'N'
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/* How backlight works:
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*
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* The brightness interface is a bit strange. There 6 levels: 0 throught 5.
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* Level 0 means backlight off. When changing brightness, one sets level to the
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* target brightness. The driver is gradually change the brightness to reach the
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* target level. The step parameters control how many hardware steps will be done.
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* For example, setting step to 1 will brutally change the level in one step.
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* Setting step to 2 will change brightness in two steps: one intermediate and
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* finally the target one. The more steps, the more gradual the transition. The
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* period parameters controls the speed to changes between steps. Using this
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* interface, one can achieve fade in/out at various speeds. */
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#define NWZ_FB_BL_MIN_LEVEL 0
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#define NWZ_FB_BL_MAX_LEVEL 5
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#define NWZ_FB_BL_MIN_STEP 1
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#define NWZ_FB_BL_MAX_STEP 100
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#define NWZ_FB_BL_MIN_PERIOD 10
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struct nwz_fb_brightness
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{
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int level; /* brightness level: 0-5 */
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int step; /* number of hardware steps to do when changing: 1-100 */
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int period; /* period in ms between steps when changing: >=10 */
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};
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#define NWZ_FB_SET_BRIGHTNESS _IOW(NWZ_FB_TYPE, 0x07, struct nwz_fb_brightness)
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#define NWZ_FB_GET_BRIGHTNESS _IOR(NWZ_FB_TYPE, 0x08, struct nwz_fb_brightness)
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#endif /* __NWZ_FB_H__ */
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