target/linux/ubicom32/files/arch/ubicom32/include/asm/ubicom32bl.h

   1 /*
   2  * arch/ubicom32/include/asm/ubicom32bl.h
   3  *   Ubicom32 architecture backlight driver platform data definitions.
   4  *
   5  * (C) Copyright 2009, Ubicom, Inc.
   6  *
   7  * This file is part of the Ubicom32 Linux Kernel Port.
   8  *
   9  * The Ubicom32 Linux Kernel Port is free software: you can redistribute
  10  * it and/or modify it under the terms of the GNU General Public License
  11  * as published by the Free Software Foundation, either version 2 of the
  12  * License, or (at your option) any later version.
  13  *
  14  * The Ubicom32 Linux Kernel Port is distributed in the hope that it
  15  * will be useful, but WITHOUT ANY WARRANTY; without even the implied
  16  * warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See
  17  * the GNU General Public License for more details.
  18  *
  19  * You should have received a copy of the GNU General Public License
  20  * along with the Ubicom32 Linux Kernel Port.  If not,
  21  * see <http://www.gnu.org/licenses/>.
  22  *
  23  * Ubicom32 implementation derived from (with many thanks):
  24  *   arch/m68knommu
  25  *   arch/blackfin
  26  *   arch/parisc
  27  */
  28 #ifndef _ASM_UBICOM32_UBICOM32_BL_H
  29 #define _ASM_UBICOM32_UBICOM32_BL_H
  30
  31 /*
  32  * Different backlight control mechanisms
  33  */
  34 enum ubicom32bl_pwm_types {
  35         /*
  36          * PWM controlled backlight
  37          */
  38         UBICOM32BL_TYPE_PWM,
  39
  40         /*
  41          * HRT based PWM backlight
  42          */
  43         UBICOM32BL_TYPE_PWM_HRT,
  44
  45         /*
  46          * No dimming, just on or off
  47          */
  48         UBICOM32BL_TYPE_BINARY,
  49 };
  50
  51 struct ubicom32bl_platform_data {
  52         /*
  53          * Default intensity of the backlight 0-255
  54          */
  55         u8_t                            default_intensity;
  56
  57         /*
  58          * TRUE if the backlight sense is active low. (inverted)
  59          * FALSE if the backlight sense is active high.
  60          */
  61         bool                            invert;
  62
  63         /*
  64          * Type of the backlight
  65          */
  66         enum ubicom32bl_pwm_types       type;
  67
  68         /*
  69          * GPIO of the backlight if UBICOM32BL_TYPE_PWM_HRT, UBICOM32BL_TYPE_BINARY
  70          */
  71         unsigned                        gpio;
  72
  73         /*
  74          * PWM channel and parameters of the backlight if UBICOM32BL_TYPE_PWM
  75          *      pre_scaler: sets the rate at which the PWM timer is clocked. (clk_core / 2^pre_scaler)
  76          *      period: sets the period of the timer in timer cycles
  77          * The duty cycle will be directly proportional to the brightness setting.
  78          */
  79         u32_t                           pwm_channel;
  80         u8_t                            pwm_prescale;
  81         u16_t                           pwm_period;
  82 };
  83
  84 #endif /* _ASM_UBICOM32_UBICOM32_BL_H */