mirror of
https://github.com/edk2-porting/linux-next.git
synced 2024-11-19 16:14:13 +08:00
3e074058d7
This patch adds a platform driver using the ATMEL PWM driver to control a backlight which requires a PWM signal and optional GPIO signal for discrete on/off signal. It has been tested on Favr-32 board from EarthLCD. The driver is configurable by supplying a struct with the platform data. See the include/linux/atmel-pwm-bl.h for details. The board code for Favr-32 will be submitted to the AVR32 kernel list. Signed-off-by: Hans-Christian Egtvedt <hans-christian.egtvedt@atmel.com> Cc: Krzysztof Helt <krzysztof.h1@poczta.fm> Cc: Haavard Skinnemoen <hskinnemoen@atmel.com> Cc: Richard Purdie <rpurdie@rpsys.net> Signed-off-by: Andrew Morton <akpm@linux-foundation.org> Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
44 lines
1.5 KiB
C
44 lines
1.5 KiB
C
/*
|
|
* Copyright (C) 2007 Atmel Corporation
|
|
*
|
|
* Driver for the AT32AP700X PS/2 controller (PSIF).
|
|
*
|
|
* This program is free software; you can redistribute it and/or modify it
|
|
* under the terms of the GNU General Public License version 2 as published
|
|
* by the Free Software Foundation.
|
|
*/
|
|
|
|
#ifndef __INCLUDE_ATMEL_PWM_BL_H
|
|
#define __INCLUDE_ATMEL_PWM_BL_H
|
|
|
|
/**
|
|
* struct atmel_pwm_bl_platform_data
|
|
* @pwm_channel: which PWM channel in the PWM module to use.
|
|
* @pwm_frequency: PWM frequency to generate, the driver will try to be as
|
|
* close as the prescaler allows.
|
|
* @pwm_compare_max: value to use in the PWM channel compare register.
|
|
* @pwm_duty_max: maximum duty cycle value, must be less than or equal to
|
|
* pwm_compare_max.
|
|
* @pwm_duty_min: minimum duty cycle value, must be less than pwm_duty_max.
|
|
* @pwm_active_low: set to one if the low part of the PWM signal increases the
|
|
* brightness of the backlight.
|
|
* @gpio_on: GPIO line to control the backlight on/off, set to -1 if not used.
|
|
* @on_active_low: set to one if the on/off signal is on when GPIO is low.
|
|
*
|
|
* This struct must be added to the platform device in the board code. It is
|
|
* used by the atmel-pwm-bl driver to setup the GPIO to control on/off and the
|
|
* PWM device.
|
|
*/
|
|
struct atmel_pwm_bl_platform_data {
|
|
unsigned int pwm_channel;
|
|
unsigned int pwm_frequency;
|
|
unsigned int pwm_compare_max;
|
|
unsigned int pwm_duty_max;
|
|
unsigned int pwm_duty_min;
|
|
unsigned int pwm_active_low;
|
|
int gpio_on;
|
|
unsigned int on_active_low;
|
|
};
|
|
|
|
#endif /* __INCLUDE_ATMEL_PWM_BL_H */
|